Slots In Pistons Can Be Used For
2021年4月10日Register here: http://gg.gg/ozuf5
Piston pump has versatile applications due to robustness and highly efficient. Hydraulic pumps, processing technology, drilling, etc. are a few of the applications which use piston pumps. It is configurable for any kind of liquid and having a linear performance curve. Piston pumps are used to move liquids or compressed gasses. It is categorized as one type of hydraulic pump with robust and efficient performance. This article discusses an overview of the piston pump and its working.
The 365 rods have a center-to-center distance of 6.625 and the 390 rods have a center to center of 6.500. You can use the 331 rods but you will have to have special pistons made. Your mechanic will have to figure out, with the 390 heads, what compression height pistons you will have to use to accomplish the desired 10 or 10.25 to 1 compression. Or make a faux connecting rod. Use a piece of round or square stock, bore a hole in it, run a circular rod through it that has been machined to be a good fit on the piston pin. On the back end of the rod put some threads so you can pull the piston down firmly against the block, then grab the block in the chuck.
The piston with thermal slots are been designed using the solidworks and then the pistons are been analysed for the thermal flow in the piston with and without the thermal slots. This advancement leads to better life of the component. All pistons can be upgraded to double pin oilers with banana groove slots on each pin boss. This provides two direct lubrication sources to each pin boss, and the banana groove slots are there to help distribute the oil around the boss to ensure broader lubrication coverage. The “Ringland” are the slots on the pistons that support the rings and their duties. A standard Subaru EJ piston will have three ringlands. The first Ringland is located between the top of the piston and the primary compression ring. This ring seals out a majority of the heat and combustion gases from the crankcase.What is a Piston Pump?
Definition: It can be defined as a machine that is used to displace liquids or compressed gases from one point to another. It is a positive displacement pump where a high-pressure seal reciprocates with the piston. These pumps are used where there is a requirement of high consistent pressure, like in water irrigation systems. Figure 1 shows the parts of the piston pump in detail. The principle of working is explained in the following section.
Piston PumpConstruction
As shown in the above figure, the piston pump consists of different parts. Each part is explained in brief
*Intake- This is part of the pump where the input is given. It may be liquid or high-pressure gas etc.
*Port Plate- This acts as the separating medium between the input port and output. The compressed gas or liquid is sent out through this medium.
*Discharge- This forms the output of the pump
*Rotating Barrel: This is a dynamic part of the pump, in which the pistons are inserted in their specific slots. When the barrel rotates, along with that the pistons rotate and displace the liquid or compressed gas.
*Piston- This forms the most important part of the pump. They are the interfacing medium between the nonrotating swash plate and the barrel. Pistons do have a spring-like system such that they reshape their size when the barrel revolves.
*Nonrotating Swash Plate- This is the interface for the external system and pistons. The pistons reshape themselves, get compressed when they come down under a force by the swashplate. The swashplate is a non-rotating part. It is fixed to the shaft.
*Shaft- The shaft is coupled to the rotating barrel and the swashplate. On the shaft, the complete assembly is housed.Piston Pump Working Principle
The operating principle is explained in points below-
*The figure shown is for axial flow variable displacement piston
*The outlet port and inlet port are used intake and exhaust of the operating liquid or gas. These are placed in a casing made up of iron.
Piston Pump Working
The driveshaft is coupled to a swashplate and rotating barrel. The swashplate adjusts itself based on the position of barrel and pistons. As shown in the figure, we have two colors for the inlet and outlet port. When the barrel rotates, the piston which is placed upside, and pressed inside and similarly the piston which is place downsides, is pressed outside. There is an inclination in the position of the swashplate. The same position is reversed for the next cycle of operation such that the location of piston completely forms a cycle. This helps in gas or liquids to be displaced from one location to other i.e. from the input port to outlet port.
The pistons rotate along with the barrel in line with the position of the swashplate. The pistons are placed inside a cylindrical block. The movement of the pistons causes a difference in pressure, which causes suction of the inlet liquid or compressed gasses. The inclination in the vertical position of the swashplate is up to 10 to 15 degrees. Because of this reason, it is called, axial flow and variable displacement piston.
The motion of the piston is called reciprocating motion. The continuous motion i.e. suction and discharge by the pistons cause the displacement in the liquid or compressed gasses. When the angle decrease, we have less suction, and when the angle increase we have more. For that reason, it is called a variable displacement piston. The variable displacement depends on the swashplate angle.Piston Pump Types
The different types of piston pumps are
Piston Pump Classification
*Lift Piston Pump- In this type of pump, the piston displaces the compressed gas or liquid with the help of a control device called a valve. The valve is placed just below the inlet port as shown in figure
*Force Piston Pump- The name force has been given based on the action piston. The piston can upstroke the fluid with force or opening of the valve, and similarly downstroke the liquid or compressed gases.
*Axial Piston Pump- The name axial has been given based direction of liquid or compressed gas to be exhausted. In this case, it is parallel to the axis of piston, hence the name axial has been given.
*Radial Piston Pump – In this piston pump, the flow of liquid is made radial, i.e. it flows outwards the piston.Specifications
Like any other machine, this pump has its own specifications. Different parameters to be specified for a pump are operating temperature, head of the pump, rate of flow, power rating, current specification, horsepower, volume stroke, pressure, etc.Piston Pump Applications
Due to its robustness, it has versatile applications. A few of them are mentioned as- High-pressure cleaning, water hydraulics, oil hydraulics, process technology, water injection, water cutting, drilling service, industrial, commercial, hydraulic pressure testing, etc.Advantages and Disadvantages
The advantages of piston pumps are given as
*The working force in a piston pump can be controlled without moving the flow rate
* The performance of the pump is not affected by the rate of flow and pressure of the liquid or compressed gas
*In this pump, as compared to the vacuum pump, the range of pressure is wide.
The disadvantages of the piston pump are:
*Due to its assembly piston pump is heavy and bulky.
*They are capable of handling only lesser flower rates
*The flow is pulsatingFAQsSlots In Pistons Can Be Used For A
1. What does piston mean?
It is a disc or a cylindrical structure, which is placed inside a tube or metal cylinder. The piston can be moved up and down based on the movement of liquid or compressed gas
2. What is a hydraulic piston pump?
A hydraulic piston pump is the one where operating fuel is compressed gas. It has a number of applications due to its versatility.
3. What are the two types of piston pumps?
They are classified as axial flow and radial flow. One more category is lifted piston and force the piston
4. What is the most efficient hydraulic pump?Slots In Pistons Can Be Used For Cash
These are categorized as the most efficient hydraulic pumps.
5. Does a piston stop moving?
No, technically speaking for engine or for a pump under the running condition the piston never stops moving. It moves up and down based on the movement of liquid or compressed gas.
Hence we have seen the circuit diagram, operating principle, and classification of piston pumps. These are one classification of hydraulic pumps that are believed to be the most efficient ones. Due to its robustness and less maintenance, these are some of the most preferable hydraulic pumps. They have the advantages of axial and radial flow, a wide range of pressure. It has the easiness of control of flow as the control does not depend on head pressure and rate of flow. Here is a question for you, what could be the maximum inclination of swashplate from its axis?
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a split type oil hydraulic piston pump and a pressurized oil feed circuit for feeding pressurized oil to two hydraulic actuators by making use of a split type oil hydraulic piston pump.
2. Description of the Prior Art
Heretofore, generally classifying the oil hydraulic piston pumps, axial type oil hydraulic piston pumps and radial type oil hydraulic pumps have been known, and as oil hydraulic piston pumps adapted for high-speed, high-pressure and variable-capacity operations the axial type oil hydraulic piston pumps have been commonly used. In these axial type oil hydraulic piston pumps is included a swash plate type piston pump which is also known as a KV pump. Among these swash plate type piston pumps, a piston pump constructed in such manner that a single pressurized oil suction slot and a plurality of pressurized oil delivery slots are formed in one valve plate that is slidably making contact with a single cylinder block provided with a plurality of pistons and pressured oil may be fed from these delivery slots to a plurality of hydraulic actuators, is known as a split type oil hydraulic pump.
A difficulty associated with such a split type oil hydraulic pump in the prior art was generation of a large variation of a flow rate when the pistons deliver the pressurized oil to the respective delivery slots. In addition, when each piston passes through the valve plate portion between the plurality of delivery slots, the delivered oil is interrupted by the valve plate, resulting in generation of a large trapping pressure, and hence the oil delivered from the piston cannot be effectively and perfectly utilized. Furthermore, in the case where the pressurized oil is fed from the plurality of pressurized oil delivery slots to a plurality of hydraulic actuators, it is necessary to feed a larger amount of pressurized oil to a hydraulic actuator that is more heavily loaded. Moreover, the larger a load of a hydraulic actuator is, the more is generated oil leakage.
SUMMARY OF THE INVENTION
The present invention has been worked out in view of the above-mentioned status of the prior art, and a principal object of the present invention is to provide a split type oil hydraulic piston pump, in which a large variation of a flow rate would not be generated when the respective pistons deliver the pressurized oil to the respective delivery slots.
Another object of the present invention is to provide a pressurized oil feed circuit system for use with a split type oil hydraulic piston pump, in which a larger amount of pressurized oil can be fed to a hydraulic actuator that is more heavily loaded. Slots In Pistons Can Be Used For Sale
Still another object of the present invention is to provide a split type oil hydraulic piston pump, in which a trapped pressure produced when each piston passes through a valve plate portion between a plurality of delivery slots can be avoided as much as possible and moreover the oil delivered from each piston can be effectively utilized to the maximum extent, and a pressurized oil feed circuit system making use of the same pump.
Yet another object of the present invention is to provide a pressurized oil feed circuit system making use of a split type oil hydraulic piston pump, which system can prevent an oil flow rate fed to a hydraulic actuator from increasing abruptly.
In order to achieve the aforementioned various objects of the invention, according to a first aspect of the present invention, there is provided a split type oil hydraulic piston pump including a plurality of piston-cylinder units disposed within a single cylinder block along one circumference at an equal angular interval and in parallel to each other and a valve plate disposed on the pressurized oil suction/delivery side of these piston-cylinder units so as to make slidable contact with the above-mentioned cylinder block and having a single suction slot and a plurality of delivery slots, in which the plurality of delivery slots are disposed along the above-mentioned one circumference as spaced by an angular interval of 60° from each other, and the plurality of piston-cylinder units are provided as many as a multiple of 6.
According to a second aspect of the present invention, there is provided a split type oil hydraulic piston pump according to the above-mentioned first aspect of the invention, in which the valve plate is further provided with outlet slots serving as additional delivery slots between adjacent delivery slots among the plurality of delivery slots.
According to a third aspect of the present invention, there is provided a pressurized oil feed circuit system making use of a split type oil hydraulic piston pump for connecting first and second hydraulic actuators with a split type oil hydraulic piston pump including a plurality of piston-cylinder units disposed within a single cylinder block along one circumference at an equal angular interval and in parallel to each other and a valve plate disposed on the pressurized oil suction/delivery side of the piston-cylinder units so as to make slidable contact with the above-mentioned cylinder block and having a single suction slot and first, second and third delivery slots disposed along the above-mentioned one circumference as spaced by an angular interval of 60° from each other, the plurality of piston-cylinder units being provided as many as a multiple of 6, which system comprises a first circuit for connecting the above-mentioned first and third delivery slots jointly to the above-mentioned first hydraulic actuator and a second circuit for connecting the above-mentioned second delivery slot to the above-mentioned second hydraulic actuator.
According to a fourth aspect of the present invention, there is provided a pressurized oil feed circuit system making use of a split type oil hydraulic piston pump for connecting first and second hydraulic actuators with a split type oil hydraulic piston pump including a plurality of piston-cylinder units disposed within a single cylinder block along one circumference at an equal angular interval and in parallel to each other and a valve plate disposed on the pressurized oil suction/delivery side of the piston-cylinder units so as to make slidable contact with the above-mentioned cylinder block and having a single suction slot and first, second and third delivery slots disposed along the above-mentioned one circumference as spaced by an angular interval of 60° from each other, the plurality of piston-cylinder units being provided as many as a multiple of 6, which system comprises a first circuit for connecting the above-mentioned first and third delivery slots jointly to the above-mentioned first hydraulic actuator, a second circuit for connecting the above-mentioned second delivery slot to the above-mentioned second actuator, and first and second outlet slots formed in the valve plate between the above-mentioned first and second delivery slots and between the above-mentioned second and third delivery slots, respectively, said first and second outlet slots being jointly and selectively connected to either one having a higher pressure of the above-mentioned first and second circuits or to both the first and second circuits if they have an equal pressure, via one switching valve.
According to a fifth aspect of the present invention, there is provided a pressurized oil feed circuit system according to the above-mentioned fourth aspect of the invention, in which the circuit for connecting the above-mentioned first and second outlet slots to the above-mentioned switching valve is provided with check valve means.
According to a sixth aspect of the present invention, there is provided a pressurized oil feed circuit system according to the above-mentioned fourth or fifth aspect of the invention, which system comprises a pulsation damper connected between the most downstream ends of the aforementioned first and second circuits for feeding pressurized oil to the above-mentioned first and second hydraulic actuators, respectively.
The above and many other advantages, features and additional objects of the present invention will become manifest to those versed in the art upon making reference to the following detailed description and accompanying drawings in which preferred structural embodiments incorporating the principles of the present invention are shown by way of illustrative example.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic longitudinal cross-section view of one embodiment of a split type oil hydraulic piston pump according to the present invention,
FIG. 2 is a schematic plan view of one embodiment of a valve plate to be used in a split type oil hydraulic piston pump according to the present invention and a hydraulic circuit diagram of one embodiment of a pressurized oil feed circuit for hydraulic actuators according to the present invention, in combination,
FIG. 3 is a graph showing a theoretical delivery flow rate of a single piston-cylinder unit in a piston pump,
FIGS. 4 to 7 are graphs showing instantaneous flow rates of pressurized oil through a second delivery slot and instantaneous flow rates of pressurized oil through first and third delivery slots in combination, respectively,
FIG. 8 is a schematic plan view of another embodiment of a valve plate to be used in a split type oil hydraulic pump according to the present invention and a hydraulic circuit diagram of another embodiment of a pressurized oil feed circuit for hydraulic actuators according to the present invention, in combination,
FIG. 9 is a hydraulic circuit diagram of still another embodiment of a pressurized oil feed circuit according to the present invention in combination with a schematic plan view of a valve plate similar to that shown in FIG. 8,
FIG. 10 is an enlarged cross-section view, partly cut away, showing an outlet slot portion of a split type oil hydraulic piston pump according to the present invention, and
FIG. 11 is an enlarged cross-section view, partly cut away, showing another embodiment of t
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Piston pump has versatile applications due to robustness and highly efficient. Hydraulic pumps, processing technology, drilling, etc. are a few of the applications which use piston pumps. It is configurable for any kind of liquid and having a linear performance curve. Piston pumps are used to move liquids or compressed gasses. It is categorized as one type of hydraulic pump with robust and efficient performance. This article discusses an overview of the piston pump and its working.
The 365 rods have a center-to-center distance of 6.625 and the 390 rods have a center to center of 6.500. You can use the 331 rods but you will have to have special pistons made. Your mechanic will have to figure out, with the 390 heads, what compression height pistons you will have to use to accomplish the desired 10 or 10.25 to 1 compression. Or make a faux connecting rod. Use a piece of round or square stock, bore a hole in it, run a circular rod through it that has been machined to be a good fit on the piston pin. On the back end of the rod put some threads so you can pull the piston down firmly against the block, then grab the block in the chuck.
The piston with thermal slots are been designed using the solidworks and then the pistons are been analysed for the thermal flow in the piston with and without the thermal slots. This advancement leads to better life of the component. All pistons can be upgraded to double pin oilers with banana groove slots on each pin boss. This provides two direct lubrication sources to each pin boss, and the banana groove slots are there to help distribute the oil around the boss to ensure broader lubrication coverage. The “Ringland” are the slots on the pistons that support the rings and their duties. A standard Subaru EJ piston will have three ringlands. The first Ringland is located between the top of the piston and the primary compression ring. This ring seals out a majority of the heat and combustion gases from the crankcase.What is a Piston Pump?
Definition: It can be defined as a machine that is used to displace liquids or compressed gases from one point to another. It is a positive displacement pump where a high-pressure seal reciprocates with the piston. These pumps are used where there is a requirement of high consistent pressure, like in water irrigation systems. Figure 1 shows the parts of the piston pump in detail. The principle of working is explained in the following section.
Piston PumpConstruction
As shown in the above figure, the piston pump consists of different parts. Each part is explained in brief
*Intake- This is part of the pump where the input is given. It may be liquid or high-pressure gas etc.
*Port Plate- This acts as the separating medium between the input port and output. The compressed gas or liquid is sent out through this medium.
*Discharge- This forms the output of the pump
*Rotating Barrel: This is a dynamic part of the pump, in which the pistons are inserted in their specific slots. When the barrel rotates, along with that the pistons rotate and displace the liquid or compressed gas.
*Piston- This forms the most important part of the pump. They are the interfacing medium between the nonrotating swash plate and the barrel. Pistons do have a spring-like system such that they reshape their size when the barrel revolves.
*Nonrotating Swash Plate- This is the interface for the external system and pistons. The pistons reshape themselves, get compressed when they come down under a force by the swashplate. The swashplate is a non-rotating part. It is fixed to the shaft.
*Shaft- The shaft is coupled to the rotating barrel and the swashplate. On the shaft, the complete assembly is housed.Piston Pump Working Principle
The operating principle is explained in points below-
*The figure shown is for axial flow variable displacement piston
*The outlet port and inlet port are used intake and exhaust of the operating liquid or gas. These are placed in a casing made up of iron.
Piston Pump Working
The driveshaft is coupled to a swashplate and rotating barrel. The swashplate adjusts itself based on the position of barrel and pistons. As shown in the figure, we have two colors for the inlet and outlet port. When the barrel rotates, the piston which is placed upside, and pressed inside and similarly the piston which is place downsides, is pressed outside. There is an inclination in the position of the swashplate. The same position is reversed for the next cycle of operation such that the location of piston completely forms a cycle. This helps in gas or liquids to be displaced from one location to other i.e. from the input port to outlet port.
The pistons rotate along with the barrel in line with the position of the swashplate. The pistons are placed inside a cylindrical block. The movement of the pistons causes a difference in pressure, which causes suction of the inlet liquid or compressed gasses. The inclination in the vertical position of the swashplate is up to 10 to 15 degrees. Because of this reason, it is called, axial flow and variable displacement piston.
The motion of the piston is called reciprocating motion. The continuous motion i.e. suction and discharge by the pistons cause the displacement in the liquid or compressed gasses. When the angle decrease, we have less suction, and when the angle increase we have more. For that reason, it is called a variable displacement piston. The variable displacement depends on the swashplate angle.Piston Pump Types
The different types of piston pumps are
Piston Pump Classification
*Lift Piston Pump- In this type of pump, the piston displaces the compressed gas or liquid with the help of a control device called a valve. The valve is placed just below the inlet port as shown in figure
*Force Piston Pump- The name force has been given based on the action piston. The piston can upstroke the fluid with force or opening of the valve, and similarly downstroke the liquid or compressed gases.
*Axial Piston Pump- The name axial has been given based direction of liquid or compressed gas to be exhausted. In this case, it is parallel to the axis of piston, hence the name axial has been given.
*Radial Piston Pump – In this piston pump, the flow of liquid is made radial, i.e. it flows outwards the piston.Specifications
Like any other machine, this pump has its own specifications. Different parameters to be specified for a pump are operating temperature, head of the pump, rate of flow, power rating, current specification, horsepower, volume stroke, pressure, etc.Piston Pump Applications
Due to its robustness, it has versatile applications. A few of them are mentioned as- High-pressure cleaning, water hydraulics, oil hydraulics, process technology, water injection, water cutting, drilling service, industrial, commercial, hydraulic pressure testing, etc.Advantages and Disadvantages
The advantages of piston pumps are given as
*The working force in a piston pump can be controlled without moving the flow rate
* The performance of the pump is not affected by the rate of flow and pressure of the liquid or compressed gas
*In this pump, as compared to the vacuum pump, the range of pressure is wide.
The disadvantages of the piston pump are:
*Due to its assembly piston pump is heavy and bulky.
*They are capable of handling only lesser flower rates
*The flow is pulsatingFAQsSlots In Pistons Can Be Used For A
1. What does piston mean?
It is a disc or a cylindrical structure, which is placed inside a tube or metal cylinder. The piston can be moved up and down based on the movement of liquid or compressed gas
2. What is a hydraulic piston pump?
A hydraulic piston pump is the one where operating fuel is compressed gas. It has a number of applications due to its versatility.
3. What are the two types of piston pumps?
They are classified as axial flow and radial flow. One more category is lifted piston and force the piston
4. What is the most efficient hydraulic pump?Slots In Pistons Can Be Used For Cash
These are categorized as the most efficient hydraulic pumps.
5. Does a piston stop moving?
No, technically speaking for engine or for a pump under the running condition the piston never stops moving. It moves up and down based on the movement of liquid or compressed gas.
Hence we have seen the circuit diagram, operating principle, and classification of piston pumps. These are one classification of hydraulic pumps that are believed to be the most efficient ones. Due to its robustness and less maintenance, these are some of the most preferable hydraulic pumps. They have the advantages of axial and radial flow, a wide range of pressure. It has the easiness of control of flow as the control does not depend on head pressure and rate of flow. Here is a question for you, what could be the maximum inclination of swashplate from its axis?
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a split type oil hydraulic piston pump and a pressurized oil feed circuit for feeding pressurized oil to two hydraulic actuators by making use of a split type oil hydraulic piston pump.
2. Description of the Prior Art
Heretofore, generally classifying the oil hydraulic piston pumps, axial type oil hydraulic piston pumps and radial type oil hydraulic pumps have been known, and as oil hydraulic piston pumps adapted for high-speed, high-pressure and variable-capacity operations the axial type oil hydraulic piston pumps have been commonly used. In these axial type oil hydraulic piston pumps is included a swash plate type piston pump which is also known as a KV pump. Among these swash plate type piston pumps, a piston pump constructed in such manner that a single pressurized oil suction slot and a plurality of pressurized oil delivery slots are formed in one valve plate that is slidably making contact with a single cylinder block provided with a plurality of pistons and pressured oil may be fed from these delivery slots to a plurality of hydraulic actuators, is known as a split type oil hydraulic pump.
A difficulty associated with such a split type oil hydraulic pump in the prior art was generation of a large variation of a flow rate when the pistons deliver the pressurized oil to the respective delivery slots. In addition, when each piston passes through the valve plate portion between the plurality of delivery slots, the delivered oil is interrupted by the valve plate, resulting in generation of a large trapping pressure, and hence the oil delivered from the piston cannot be effectively and perfectly utilized. Furthermore, in the case where the pressurized oil is fed from the plurality of pressurized oil delivery slots to a plurality of hydraulic actuators, it is necessary to feed a larger amount of pressurized oil to a hydraulic actuator that is more heavily loaded. Moreover, the larger a load of a hydraulic actuator is, the more is generated oil leakage.
SUMMARY OF THE INVENTION
The present invention has been worked out in view of the above-mentioned status of the prior art, and a principal object of the present invention is to provide a split type oil hydraulic piston pump, in which a large variation of a flow rate would not be generated when the respective pistons deliver the pressurized oil to the respective delivery slots.
Another object of the present invention is to provide a pressurized oil feed circuit system for use with a split type oil hydraulic piston pump, in which a larger amount of pressurized oil can be fed to a hydraulic actuator that is more heavily loaded. Slots In Pistons Can Be Used For Sale
Still another object of the present invention is to provide a split type oil hydraulic piston pump, in which a trapped pressure produced when each piston passes through a valve plate portion between a plurality of delivery slots can be avoided as much as possible and moreover the oil delivered from each piston can be effectively utilized to the maximum extent, and a pressurized oil feed circuit system making use of the same pump.
Yet another object of the present invention is to provide a pressurized oil feed circuit system making use of a split type oil hydraulic piston pump, which system can prevent an oil flow rate fed to a hydraulic actuator from increasing abruptly.
In order to achieve the aforementioned various objects of the invention, according to a first aspect of the present invention, there is provided a split type oil hydraulic piston pump including a plurality of piston-cylinder units disposed within a single cylinder block along one circumference at an equal angular interval and in parallel to each other and a valve plate disposed on the pressurized oil suction/delivery side of these piston-cylinder units so as to make slidable contact with the above-mentioned cylinder block and having a single suction slot and a plurality of delivery slots, in which the plurality of delivery slots are disposed along the above-mentioned one circumference as spaced by an angular interval of 60° from each other, and the plurality of piston-cylinder units are provided as many as a multiple of 6.
According to a second aspect of the present invention, there is provided a split type oil hydraulic piston pump according to the above-mentioned first aspect of the invention, in which the valve plate is further provided with outlet slots serving as additional delivery slots between adjacent delivery slots among the plurality of delivery slots.
According to a third aspect of the present invention, there is provided a pressurized oil feed circuit system making use of a split type oil hydraulic piston pump for connecting first and second hydraulic actuators with a split type oil hydraulic piston pump including a plurality of piston-cylinder units disposed within a single cylinder block along one circumference at an equal angular interval and in parallel to each other and a valve plate disposed on the pressurized oil suction/delivery side of the piston-cylinder units so as to make slidable contact with the above-mentioned cylinder block and having a single suction slot and first, second and third delivery slots disposed along the above-mentioned one circumference as spaced by an angular interval of 60° from each other, the plurality of piston-cylinder units being provided as many as a multiple of 6, which system comprises a first circuit for connecting the above-mentioned first and third delivery slots jointly to the above-mentioned first hydraulic actuator and a second circuit for connecting the above-mentioned second delivery slot to the above-mentioned second hydraulic actuator.
According to a fourth aspect of the present invention, there is provided a pressurized oil feed circuit system making use of a split type oil hydraulic piston pump for connecting first and second hydraulic actuators with a split type oil hydraulic piston pump including a plurality of piston-cylinder units disposed within a single cylinder block along one circumference at an equal angular interval and in parallel to each other and a valve plate disposed on the pressurized oil suction/delivery side of the piston-cylinder units so as to make slidable contact with the above-mentioned cylinder block and having a single suction slot and first, second and third delivery slots disposed along the above-mentioned one circumference as spaced by an angular interval of 60° from each other, the plurality of piston-cylinder units being provided as many as a multiple of 6, which system comprises a first circuit for connecting the above-mentioned first and third delivery slots jointly to the above-mentioned first hydraulic actuator, a second circuit for connecting the above-mentioned second delivery slot to the above-mentioned second actuator, and first and second outlet slots formed in the valve plate between the above-mentioned first and second delivery slots and between the above-mentioned second and third delivery slots, respectively, said first and second outlet slots being jointly and selectively connected to either one having a higher pressure of the above-mentioned first and second circuits or to both the first and second circuits if they have an equal pressure, via one switching valve.
According to a fifth aspect of the present invention, there is provided a pressurized oil feed circuit system according to the above-mentioned fourth aspect of the invention, in which the circuit for connecting the above-mentioned first and second outlet slots to the above-mentioned switching valve is provided with check valve means.
According to a sixth aspect of the present invention, there is provided a pressurized oil feed circuit system according to the above-mentioned fourth or fifth aspect of the invention, which system comprises a pulsation damper connected between the most downstream ends of the aforementioned first and second circuits for feeding pressurized oil to the above-mentioned first and second hydraulic actuators, respectively.
The above and many other advantages, features and additional objects of the present invention will become manifest to those versed in the art upon making reference to the following detailed description and accompanying drawings in which preferred structural embodiments incorporating the principles of the present invention are shown by way of illustrative example.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic longitudinal cross-section view of one embodiment of a split type oil hydraulic piston pump according to the present invention,
FIG. 2 is a schematic plan view of one embodiment of a valve plate to be used in a split type oil hydraulic piston pump according to the present invention and a hydraulic circuit diagram of one embodiment of a pressurized oil feed circuit for hydraulic actuators according to the present invention, in combination,
FIG. 3 is a graph showing a theoretical delivery flow rate of a single piston-cylinder unit in a piston pump,
FIGS. 4 to 7 are graphs showing instantaneous flow rates of pressurized oil through a second delivery slot and instantaneous flow rates of pressurized oil through first and third delivery slots in combination, respectively,
FIG. 8 is a schematic plan view of another embodiment of a valve plate to be used in a split type oil hydraulic pump according to the present invention and a hydraulic circuit diagram of another embodiment of a pressurized oil feed circuit for hydraulic actuators according to the present invention, in combination,
FIG. 9 is a hydraulic circuit diagram of still another embodiment of a pressurized oil feed circuit according to the present invention in combination with a schematic plan view of a valve plate similar to that shown in FIG. 8,
FIG. 10 is an enlarged cross-section view, partly cut away, showing an outlet slot portion of a split type oil hydraulic piston pump according to the present invention, and
FIG. 11 is an enlarged cross-section view, partly cut away, showing another embodiment of t
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