A straight-shaft swash plate type hydraulic piston pump core structure and hydraulic piston pump

Abstract

The present application relates to the technical fields of swash plate type hydraulic piston pump, and discloses a straight-shaft swash plate type hydraulic piston pump core structure, which comprises a transmission shaft, a controller, a cylinder body fixedly arranged at one end of the transmission shaft, and piston holes uniformly arranged in the cylinder body, a piston movably arranged in the piston hole, and a sliding shoe arranged at one end of the piston, further comprising a deviation rectifying device arranged at one side of the cylinder body and comprising a shaft ring movably sleeved on the piston and an electric push rod fixedly arranged on the cylinder body. Through the arrangement of the deviation rectifying device, the eccentric force of the piston can be offset by the deviation rectifying device when the piston moves in the piston hole, and the electric push rod is used to pull the shaft ring to reduce the eccentric force and the abrasion between the piston hole and the piston when the piston rotates to the highest point of the wear plate, i.e. the end point of the sliding of the piston in the piston hole.

Description

Technical Field

[0001] This invention relates to the field of swashplate hydraulic piston pump technology, specifically to a straight-shaft swashplate hydraulic piston pump core structure and a hydraulic piston pump. Background Technology

[0002] The swashplate axial piston pump is a key component of a hydraulic system. It achieves oil suction and discharge by the reciprocating motion of pistons within the piston chamber, changing the chamber's volume. It is a positive displacement hydraulic pump. For the swashplate axial piston pump, the pistons, slippers, distributor plate, and cylinder body are crucial components. The pistons are one of the main load-bearing parts, evenly distributed axially within the piston bores of the cylinder body. The swashplate and distributor plate remain stationary, while the cylinder body is driven to rotate via a transmission shaft from an external drive unit. As the pump shaft rotates, each piston continuously reciprocates, performing oil suction and discharge. The coordinated action of multiple pistons creates a continuous flow output. The swashplate piston pump has advantages such as high rated pressure, compact structure, high efficiency, and smooth operation. However, it also has some shortcomings during operation, as follows: During use, due to the change in the angle of the swashplate, the force exerted on the plunger when it is pushed will also have an angular deviation, as shown in the instruction manual. Figure 12 As shown, the plunger will receive an eccentric force, causing friction between the plunger and the cylinder block. This not only causes wear and leads to seal failure, but also generates a lot of heat due to friction. Once the heat accumulates, it will accelerate the wear rate and reduce the service life of the plunger. Summary of the Invention

[0003] This invention provides a straight-shaft swashplate hydraulic piston pump core structure and a hydraulic piston pump, which has the advantages of low friction and good heat dissipation, and solves the problems in the background art.

[0004] This invention provides the following technical solution: a straight-shaft swashplate hydraulic plunger pump core structure, including a drive shaft and a controller, and a cylinder fixedly mounted at one end of the drive shaft, wherein piston holes are uniformly opened inside the cylinder, a plunger is movably mounted inside the piston holes, and a slipper is provided at one end of the plunger; the invention also includes: a correction device, which is located on one side of the cylinder, and the correction device includes a collar movably sleeved on the plunger and an electric push rod fixedly mounted on the cylinder; the collar is filled with a steel column, and the steel column contacts the surface of the plunger; a limit block is fixedly mounted on one side of the collar, and the limit block is movably engaged with the cylinder to limit the movement of the collar; the extended end of the electric push rod is fixedly connected to the collar.

[0005] Preferably, when there is only one electric push rod on the collar, the central axis of the electric push rod is perpendicular to the central axis of the collar and the cylinder body respectively; when there are three electric push rods on the collar, the three electric push rods are evenly distributed on the circumference of the collar.

[0006] A straight-shaft swashplate hydraulic piston pump includes a pump body, with a drive shaft disposed inside the pump body. A swashplate is movably disposed inside the pump body, and a support plate is fixedly disposed inside the swashplate, with one side of the support plate contacting one side of a slipper. A connecting plate adjusting device is fixedly disposed on the pump body, and the movable end of the connecting plate adjusting device is movably connected to the top of the swashplate, causing the swashplate to deflect. A heat dissipation device is fixedly disposed on the piston. A support arc plate is movably disposed on the drive shaft, and a support plate is movably disposed on the support arc plate. The support plate is movably connected to the slipper for supporting the slipper. A push spring is movably disposed on the drive shaft to provide support force for the push spring. Connecting pipes are symmetrically fixedly disposed on one side of the pump body, and one-way valves are fixedly disposed on each of the connecting pipes.

[0007] Preferably, the heat dissipation device includes a pressure valve fixedly mounted on the plunger and a heat dissipation cavity opened inside the plunger, and a heat dissipation ball is provided outside the pressure valve through a pipe.

[0008] Preferably, a limiting post is fixedly installed on the side of the cylinder body and between the correction devices, and elastic ropes are fixedly installed at both ends of the heat dissipation ball, with the other end of the elastic ropes being fixedly connected to the support plate and the limiting post respectively, for pulling the heat dissipation ball.

[0009] Preferably, the limiting post is frustum-shaped and hollow inside.

[0010] Preferably, the heat dissipation ball includes a gas storage device, which consists of left and right circular plates and a central air bladder. The gas storage device is equipped with a support spring, and the two ends of the support spring are respectively fixedly connected to the two circular plates to support the circular plates. The gas storage device is filled with nitrogen gas.

[0011] Preferably, a liquid storage bladder is fixedly installed on the outside of the gas storage device, and the liquid storage bladder is filled with coolant.

[0012] Preferably, a partition plate is fixedly installed inside the pump body, and the side of the partition plate is in contact with the side of the cylinder body, and the partition plate is movably sleeved with the drive shaft.

[0013] The present invention has the following beneficial effects: By setting up a correction device, when the plunger moves inside the piston bore, the correction device cancels out the eccentric force of the plunger. When the plunger rotates to the highest point of the wear-resistant plate, it is the end point of the plunger's sliding in the piston bore. To cancel out the eccentric force, an electric push rod is used to pull the collar, thereby reducing the eccentric force, reducing wear between the piston bore and the plunger, and the collar can also be used to support and limit the plunger, preventing the plunger from deflecting inside the piston bore. The number of electric push rods on the collar can be set according to actual needs to ensure that the eccentric force of the plunger can be reduced or even eliminated. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the pump core structure of the present invention; Figure 3 This is a schematic diagram of the installation of the cylinder block and drive shaft of the present invention; Figure 4 This is a schematic diagram showing the distribution of the three electric actuators in the structure of this invention; Figure 5 This is a schematic diagram of the force analysis of the structural correction device of the present invention; Figure 6 This is a frontal half-sectional view of the structure of the present invention; Figure 7 This is a schematic diagram of the overall internal structure of the present invention; Figure 8 This is a schematic diagram of the installation of the heat dissipation device of the present invention; Figure 9 This is a cross-sectional schematic diagram of the heat dissipation sphere structure of the present invention; Figure 10 For the present invention Figure 9 Enlarged view of point A in the middle; Figure 11 This is a schematic diagram of the installation of the structural partition plate of the present invention; Figure 12 This is a schematic diagram illustrating the force analysis of the piston structure of the present invention.

[0015] In the diagram: 1. Pump body; 2. Drive shaft; 3. Cylinder; 4. Piston bore; 5. Plunger; 6. Correction device; 61. Shaft collar; 62. Limiting block; 63. Electric push rod; 7. Cooling device; 71. Pressure valve; 72. Cooling cavity; 73. Cooling ball; 731. Air storage device; 732. Support spring; 733. Liquid storage bladder; 74. Limiting post; 75. Elastic rope; 8. Slipper; 9. Support plate; 10. Swashplate; 11. Wear-resistant plate; 12. Support arc plate; 13. Push spring; 14. Connecting plate adjustment device; 15. Divider plate; 16. Check valve. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figure 1-11 A straight-shaft swashplate hydraulic piston pump core structure includes a drive shaft 2 and a controller, and a cylinder 3 fixedly mounted on one end of the drive shaft 2. The cylinder 3 has piston holes 4 evenly distributed inside, and a piston 5 is movably mounted inside the piston holes 4. A slipper 8 is provided at one end of the piston 5. The pump also includes a correction device 6, which is located on one side of the cylinder 3. The correction device 6 includes a collar 61 movably sleeved on the piston 5 and an electric push rod 63 fixedly mounted on the cylinder 3. The collar 61 is filled with steel columns, which contact the surface of the piston 5. A limit block 62 is fixedly mounted on one side of the collar 61 and is movably engaged with the cylinder 3 to limit the movement of the collar 61. The extended end of the electric push rod 63 is fixedly connected to the collar 61.

[0018] When the plunger 5 moves inside the piston bore 4, the cylinder body 3 rotates with the drive shaft 2. During rotation, the inclined surface of the swashplate generates an eccentric force on the plunger 5, causing friction between the plunger 5 and the inner wall of the piston bore 4. Therefore, the eccentric force on the plunger 5 is counteracted by the correction device 6, as shown in the instruction manual. Figure 5 As can be seen, when the plunger 5 rotates to the highest point of the wear plate 11, it is the end point of the plunger 5 sliding in the piston hole 4. In order to counteract the eccentric force, the electric push rod 63 is used to pull the collar 61, thereby reducing the eccentric force, reducing the wear between the piston hole 4 and the plunger 5, and the collar 61 can be used to support and limit the plunger 5 to prevent the plunger 5 from deflecting inside the piston hole 4. When there is only one electric push rod 63 on the collar 61, the central axis of the electric push rod 63 is perpendicular to the central axis of both the collar 61 and the cylinder 3. Only one electric push rod 63 provides external force to the collar 61 to counteract the force on the plunger 5. Since the angle between the slipper 8 and the plunger 5 continuously changes as the plunger 5 rotates with the cylinder 3, the angle of its component force also changes. Therefore, only one electric push rod 63 can reduce a portion of the component force. However, in conjunction with the limiting block 62, it can limit the movement of the collar 61, ensuring that the collar 61 has freedom in only one direction, allowing it to pass smoothly. The piston 5 is supported between two pistons to reduce the bias pressure on the inner wall of the piston bore 4 and reduce wear. When there are three electric push rods 63 on the collar 61, the three electric push rods 63 are evenly distributed on the circumference of the collar 61. The collar 61 is supported by the three electric push rods 63. The magnitude of the force on the collar 61 can be adjusted according to the position of the piston 5. In this way, the resultant force formed by the three electric push rods 63 can counteract the eccentric component force of the piston 5. This ensures that the piston 5 can perform effective piston movement in the piston bore 4, reduces the contact force with the inner wall of the piston bore 4, reduces frictional loss, and extends service life.

[0019] A straight-shaft swashplate hydraulic piston pump includes a pump body 1, and a drive shaft 2 is disposed inside the pump body 1. A swashplate 10 is movably disposed inside the pump body 1, and a support plate 9 is fixedly disposed inside the swashplate 10. One side of the support plate 9 contacts one side of the slipper 8. A connecting plate adjusting device 14 is fixedly disposed on the pump body 1, and the movable end of the connecting plate adjusting device 14 is movably connected to the top of the swashplate 10 to drive the swashplate 10 to deflect. A heat dissipation device 7 is fixedly disposed on the piston 5. A support arc plate 12 is movably disposed on the drive shaft 2, and a support plate 9 is movably disposed on the support arc plate 12. The support plate 9 is movably connected to the slipper 8 for supporting the slipper 8. A push spring 13 is movably disposed on the drive shaft 2 to provide support force for the push spring 13. A connecting pipe is symmetrically fixedly disposed on one side of the pump body 1, and a one-way valve 16 is fixedly disposed on each of the connecting pipes. The swashplate 10 is deflected by the connecting plate adjustment device 14, and then the swashplate 10 deflects the wear-resistant plate 11, pressing a portion of the plunger 5 into the piston hole 4 to varying degrees. Subsequently, the transmission shaft 2 drives the cylinder 3 to rotate, causing the cylinder 3 to rotate along with the plunger 5. At this time, under the limiting action of the wear-resistant plate 11 and the support of the push spring 13, the plunger 5 performs piston movement inside the piston hole 4, thereby achieving oil suction and oil pressure. At the same time, during the rotation, the heat dissipation device 7 is also compressed, and during the compression process, the inner cavity of the plunger 5 is ventilated, thereby cooling the plunger 5, reducing the heat generated by the friction of the plunger 5, and preventing the plunger 5 from performing piston movement for a long time, which would lead to a large amount of heat accumulation and increase the coefficient of friction.

[0020] The heat dissipation device 7 includes a pressure valve 71 fixedly mounted on the plunger 5 and a heat dissipation cavity 72 opened inside the plunger 5. A heat dissipation ball 73 is installed outside the pressure valve 71 through a pipe. When the cylinder 3 rotates, the heat dissipation ball 73 is squeezed between the support plate 9 and the cylinder 3, which can fill the interior of the plunger 5 with gas for exchange, thereby transferring the heat of the plunger 5 to the outside and achieving the heat dissipation effect.

[0021] A limiting post 74 is fixedly installed on the side of the cylinder 3 and between the correction device 6. Both ends of the heat dissipation ball 73 are fixedly provided with elastic ropes 75, and the other end of the elastic ropes 75 is fixedly connected to the support plate 9 and the limiting post 74 respectively, for pulling the heat dissipation ball 73. Through the elastic ropes 75, the heat dissipation ball 73 is pulled so that it can be placed between the support plate 9 and the limiting post 74, and during the rotation, it can be precisely squeezed by the two to prevent it from deviating.

[0022] The limiting post 74 is truncated cone-shaped and hollow inside. When the elastic rope 75 pulls the heat dissipation ball 73, it is in a stretched state. Subsequently, when the support plate 9 pushes the heat dissipation ball 73 against the limiting post 74, the elastic rope 75 can retract into the hollow cavity of the limiting post 74, which facilitates the limiting post 74 to pressurize the heat dissipation ball 73 in the future and prevents the elastic rope 75 from deviating and being crushed.

[0023] The cooling ball 73 includes a gas storage device 731, which consists of left and right circular plates and a central air bladder. A support spring 732 is installed inside the gas storage device 731, and the two ends of the support spring 732 are fixedly connected to the two circular plates to support them. The gas storage device 731 is filled with nitrogen. The two circular plates are squeezed towards the center by the support plate 9 and the limiting post 74. Then, the nitrogen in the air bladder is squeezed and injected into the plunger 5 through the pressure valve 71. As the cylinder 3 continues to rotate, the cooling ball 73 is gradually released. Under the support of the support spring 732, the two circular plates are pushed apart and moved away from each other. The nitrogen inside the plunger 5 gradually flows back into the gas storage device 731. After external cooling, it waits for the next cooling cycle.

[0024] The gas storage device 731 is externally fixed with a liquid storage bladder 733, and the liquid storage bladder 733 is filled with coolant. When the nitrogen gas entering the plunger 5 absorbs heat and is discharged, it exchanges heat again with the coolant in the liquid storage bladder 733 in the gas storage device 731 to achieve rapid cooling and prepare for the next heat exchange of the nitrogen gas.

[0025] A partition plate 15 is fixedly installed inside the pump body 1, and the side of the partition plate 15 is in contact with the side of the cylinder body 3. The partition plate 15 is movably sleeved with the drive shaft 2, and the oil suction area and the oil pressure area are separated by the partition plate 15. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A straight-shaft swashplate hydraulic piston pump core structure, comprising a drive shaft (2) and a controller, and a cylinder (3) fixedly disposed at one end of the drive shaft (2), wherein piston holes (4) are uniformly opened inside the cylinder (3), a piston (5) is movably disposed inside the piston hole (4), and a slipper (8) is disposed at one end of the piston (5), characterized in that: Also includes: The correction device (6) is located on one side of the cylinder (3), and the correction device (6) includes a collar (61) movably sleeved on the plunger (5) and an electric push rod (63) fixedly mounted on the cylinder (3). The collar (61) is filled with steel columns and contacts the surface of the plunger (5) through the steel columns. A limit block (62) is fixedly mounted on one side of the collar (61) and the limit block (62) is movably engaged with the cylinder (3) to limit the movement of the collar (61). The protruding end of the electric push rod (63) is fixedly connected to the collar (61).

2. The pump core structure of a straight-shaft swashplate hydraulic piston pump according to claim 1, characterized in that: When there is only one electric push rod (63) on the collar (61), the central axis of the electric push rod (63) is perpendicular to the central axis of the collar (61) and the cylinder (3) respectively; when there are three electric push rods (63) on the collar (61), the three electric push rods (63) are evenly distributed on the circumference of the collar (61).

3. A straight-shaft swashplate hydraulic piston pump, comprising a pump body (1), and a drive shaft (2) disposed inside the pump body (1), wherein a swashplate body (10) is movably disposed inside the pump body (1), a support plate (9) is fixedly disposed inside the swashplate body (10), and one side of the support plate (9) contacts one side of the slipper (8), a connecting plate adjusting device (14) is fixedly disposed on the pump body (1), and the movable end of the connecting plate adjusting device (14) is movably connected to the top of the swashplate body (10), thereby driving the swashplate body (10) to deflect, characterized in that: A heat dissipation device (7) is fixedly installed on the plunger (5), a support arc disk (12) is movably installed on the transmission shaft (2), and a support disk (9) is movably installed on the support arc disk (12). The support disk (9) is movably connected to the slipper (8) and is used to support the slipper (8). A push spring (13) is movably installed on the transmission shaft (2) to provide support force for the push spring (13). A connecting pipe is symmetrically fixedly installed on one side of the pump body (1), and a one-way valve (16) is fixedly installed on the connecting pipe respectively.

4. A straight-shaft swashplate hydraulic piston pump according to claim 3, characterized in that: The heat dissipation device (7) includes a pressure valve (71) fixedly mounted on the plunger (5) and a heat dissipation cavity (72) opened inside the plunger (5). A heat dissipation ball (73) is provided outside the pressure valve (71) through a pipe.

5. A straight-shaft swashplate hydraulic piston pump according to claim 3, characterized in that: A limiting post (74) is fixedly installed on the side of the cylinder (3) and between the correction device (6). Both ends of the heat dissipation ball (73) are fixedly provided with elastic ropes (75), and the other end of the elastic ropes (75) is fixedly connected to the support plate (9) and the limiting post (74) respectively, for pulling the heat dissipation ball (73).

6. A straight-shaft swashplate hydraulic piston pump according to claim 3, characterized in that: The limiting post (74) is frustum-shaped and hollow inside.

7. A straight-shaft swashplate hydraulic piston pump according to claim 5, characterized in that: The heat dissipation ball (73) includes a gas storage device (731), which is composed of left and right circular plates and a central air bladder. The gas storage device (731) is equipped with a support spring (732), and the two ends of the support spring (732) are fixedly connected to the two circular plates respectively to support the circular plates. The gas storage device (731) is filled with nitrogen.

8. A straight-shaft swashplate hydraulic piston pump according to claim 6, characterized in that: The gas storage device (731) is externally fixedly provided with a liquid storage bladder (733), and the liquid storage bladder (733) is filled with coolant.

9. The straight-shaft swashplate hydraulic piston pump according to claim 3 is characterized in that: The pump body (1) is fixedly provided with a partition plate (15), and the side of the partition plate (15) is in contact with the side of the cylinder body (3). The partition plate (15) is movably connected to the transmission shaft (2).

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