An axial piston pump with a slant plate support structure
By introducing a swash plate support structure into the plunger pump, the problem of the short service life of the swash plate device is solved, the stability and service life of the swash plate are improved, and wear is reduced.
Patent Information
- Application Number
- CN202411911571.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2044-12-24
Smart Images
Figure CN119878486B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of vehicle charging, and in particular to an axial piston pump with a swash plate support structure. Background Art
[0002] Hydraulic transmission, as one of the primary transmission methods in industry, has a wide range of applications. The plunger pump is the most commonly used power element in hydraulic transmission systems. Therefore, improving the performance of the plunger pump is crucial for improving the performance of the entire hydraulic system. When the plunger transitions from the suction to the discharge area, the switch between high and low pressures creates a pressure surge. Therefore, the valve plate is typically designed with a dead zone. This dead zone prevents the plunger cavity from immediately connecting to the other cavity after leaving the suction or discharge chamber. Instead, the swash plate mechanically adjusts the plunger cavity's volume, altering its oil pressure to reduce the pressure differential with the incoming suction or discharge chamber. This process helps mitigate or eliminate pressure surges.
[0003] However, when the plunger pump has different flow rates and different swash plate inclination angles, the stroke of the plunger in the dead zone varies greatly, which will cause uneven pressure in the plunger cavity and affect stability. In order to achieve a smooth transition of pressure in the plunger cavity under all flow conditions, the plunger pump swash plate is usually designed with a staggered angle so that the plunger stroke in the dead zone is similar under different flow conditions. The staggered angle can improve the flow distribution effect of the plunger pump, adjust the flow pulsation during the flow distribution process, and thus reduce the flow noise. At the same time, the impact force generated by the repeated extension and contraction of the plunger will be transmitted to the swash plate, causing the swash plate to wear and reduce its service life. The swash plate is a key component that converts the rotational motion of the drive shaft into the reciprocating motion of the plunger. The service life of the swash plate is directly related to the plunger pump itself. Therefore, a method to increase the service life of the swash plate is currently urgently needed. Summary of the Invention
[0004] In order to solve the problem that the swash plate device of an axial piston pump has a short service life, the present invention provides an axial piston pump with a swash plate support structure, comprising:
[0005] case;
[0006] A distribution plate, the distribution plate is located in the housing; the distribution plate is detachably connected to the housing; the distribution plate has an oil suction port and an oil discharge port; the area where the oil discharge port transitions to the oil suction port is a first transition area; the area where the oil suction port transitions to the oil discharge port is a second transition area;
[0007] A central shaft, the central shaft being disposed in the housing; the central shaft being rotatably connected to the housing;
[0008] A cylinder body, the cylinder body is located in the housing; one end of the cylinder body is in contact with the distribution plate; the cylinder body is detachably connected to the central shaft; the central shaft drives the cylinder body to rotate; the cylinder body has a plurality of plunger holes;
[0009] A plurality of plunger rods, the plunger rods being located in the housing; the plunger rods being arranged around the central axis; the plunger rods being parallel to the central axis; the plunger rods corresponding to the plunger holes one by one; and the plunger rods being slidably inserted into the plunger holes;
[0010] a swash plate, the swash plate being located within the housing; the swash plate being rotatably connected to the housing; an angle at which the swash plate rotates about a first axis being a displacement angle; an angle at which the swash plate rotates about a second axis being a stagger angle; the first axis, the second axis, and the axis of the central axis being perpendicular to each other; and the second axis being parallel to a line connecting the first transition region and the second transition region.
[0011] A first support portion, the first support portion is located inside the housing; the first support portion is movably connected to the swash plate, and the distance from the first side of the swash plate to the distribution plate is smaller than the distance from the second side of the swash plate to the distribution plate; the first support portion is clamped between the first side of the swash plate and the inner wall of the housing.
[0012] In some embodiments, the first support portion includes a first spherical seat; the first spherical seat is articulated with the swash plate ball; and the first spherical seat is clamped between a first side of the swash plate and an inner wall of the housing.
[0013] In some embodiments, the first support portion also includes a first bushing; the swash plate has a mounting groove; the swash plate is articulated with the first spherical seat through the first bushing; the first bushing is clamped between the first spherical seat and the swash plate; the first spherical seat is clamped between the first bushing and the inner wall of the housing; the hardness of the first bushing is less than the hardness of the first spherical seat and the swash plate.
[0014] In some embodiments, the first side of the swash plate has a first oil hole; the first bushing has a second oil hole; the first spherical seat has a third oil hole; the first oil hole is connected to the inner cavity of the housing; the third oil hole is connected to the first oil hole through the second oil hole; the third oil hole is connected to the inner cavity of the housing.
[0015] In some embodiments, the diameter of the first oil hole is larger than the diameter of the second oil hole; and the diameter of the second oil hole is smaller than the diameter of the third oil hole.
[0016] In some embodiments, the first spherical seat includes a first ball head and a first base; the first ball head and the first base are integrally formed; the third oil hole passes through the first ball head; the first base is provided with a first connecting groove and a second connecting groove that intersect vertically; the third oil hole is connected to the inner cavity of the shell through the first connecting groove and the second connecting groove; the third oil hole is located at the intersection of the first connecting groove and the second connecting groove.
[0017] In some embodiments, the opening width of the first communicating groove gradually increases in a direction away from the third oil hole; the opening width of the second communicating groove gradually increases in a direction away from the third oil hole.
[0018] In some embodiments, the material of the first spherical seat is any one of bearing steel, carburizing steel, and nitriding steel;
[0019] The first bushing is made of copper alloy, and the surface of the first bushing is plated with a silver film; or the first bushing is made of aluminum alloy.
[0020] In some embodiments, the axial piston pump with a swash plate support structure further includes a second support portion; the second support portion is located in the housing; the second support portion is clamped between the second side of the swash plate and the inner wall of the housing; the second support portion is hinged to the swash plate ball;
[0021] The second support portion includes a second spherical seat and a second bushing; the second spherical seat is hinged to the swash plate ball through the second bushing; the second bushing is clamped between the second side of the swash plate and the second spherical seat; the second spherical seat is clamped between the second bushing and the inner wall of the housing.
[0022] In some embodiments, the second side of the swash plate has a fourth oil hole; the second bushing has a fifth oil hole; the second spherical seat has a sixth oil hole; the fourth oil hole is connected to the sixth oil hole through the fifth oil hole; the fourth oil hole and the sixth oil hole are respectively connected to the inner cavity of the shell; the diameters of the fourth oil hole, the fifth oil hole and the sixth oil hole are equal.
[0023] In order to solve the problem of short service life of the swash plate device of the axial piston pump, the present invention has the following advantages:
[0024] The present inventors discovered that in plunger pumps, the stagger angle creates an additional lateral force perpendicular to the central axis on the swash plate. Conventional plunger pump swash plates lack a structure to support this lateral force, making them susceptible to fatigue deformation or wear, shortening the pump's service life. To address this, the present inventors designed a first support structure as a swash plate support structure. This structure provides support for the lateral force without affecting the swash plate's displacement angle adjustment, thereby improving its stability and service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 A schematic cross-sectional view of an axial piston pump with a swash plate support structure according to an embodiment is shown;
[0026] Figure 2 A schematic diagram of the swash plate structure of an embodiment is shown;
[0027] Figure 3 Shown Figure 2 A schematic right side view of the swash plate shown;
[0028] Figure 4 An exploded schematic diagram of a swash plate structure according to an embodiment is shown.
[0029] Figure numerals: 10 housing; 20 distribution plate; 21 oil suction port; 22 oil discharge port; 30 center axis; 40 cylinder body; 50 plunger rod; 60 swash plate; 61 first oil hole; 62 fourth oil hole; 70 first support portion; 71 first spherical seat; 711 first ball head; 712 first base; 713 first connecting groove; 714 second connecting groove; 72 first bushing; 73 second oil hole; 74 third oil hole; 80 second support portion; 81 second spherical seat; 82 second bushing; 83 fifth oil hole; 84 sixth oil hole. DETAILED DESCRIPTION
[0030] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the present disclosure, rather than to imply any limitation on the scope of the present disclosure.
[0031] As used herein, the term "including" and its variations are to be interpreted as open-ended terms meaning "including, but not limited to." The term "based on" is to be interpreted as "based, at least in part, on." The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment." The term "another embodiment" is to be interpreted as "at least one other embodiment." Terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily intended to better describe the present application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationships. For example, the term "on" may, in certain circumstances, be used to indicate a dependency or connection relationship. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" are to be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.
[0032] The plunger pump sets a staggered angle of the swash plate 60 for the purpose of smoothing the pressure transition. The present invention finds that the effect of the staggered angle will cause the swash plate 60 to bear an additional lateral force perpendicular to the central axis 30. Especially for high-pressure and high-flow hydraulic plunger pumps, the greater the force on the swash plate 60 and the larger the staggered angle, the greater the lateral force it bears. However, the swash plate 60 device of the traditional plunger pump has never been designed with a lateral force bearing structure, resulting in wear and tear on the lateral force bearing parts inside the plunger pump, limiting the service life of the plunger pump. To this end, in this embodiment, an axial plunger pump with a swash plate 60 support mechanism is provided, such as Figure 1 As shown, the axial piston pump with a swash plate 60 support structure includes a housing 10 , a port plate 20 , a central shaft 30 , a cylinder block 40 , a plurality of piston rods 50 , a swash plate 60 and a first support portion 70 .
[0033] The distribution plate 20 is located within the housing 10 and is detachably connected to the housing 10. The distribution plate 20 has an oil intake port 21 and an oil discharge port 22. The area where the discharge port 22 transitions to the oil intake port 21 is the first transition zone, and the area where the oil intake port 21 transitions to the discharge port 22 is the second transition zone.
[0034] The central shaft 30 passes through the housing 10 , and the central shaft 30 is rotatably connected to the housing 10 .
[0035] The cylinder body 40 is located in the housing 10, and is coaxial with the central shaft 30. One axial end of the cylinder body 40 is in contact with the distribution plate 20. The cylinder body 40 is detachably connected to the central shaft 30, and the central shaft 30 drives the cylinder body 40 to rotate. The cylinder body 40 has a plurality of plunger holes.
[0036] The plunger rod 50 is located in the housing 10 and is disposed around the central axis 30. The plunger rod 50 is parallel to the central axis 30. The plunger rod 50 corresponds to the plunger hole one by one and the plunger rod 50 is slidably disposed in the plunger hole.
[0037] The swash plate 60 is located within the housing 10 and is rotatably connected to the housing 10. The angle of rotation of the swash plate 60 about the first axis is the displacement angle, and the angle of rotation of the swash plate 60 about the second axis is the stagger angle. The first and second axes are perpendicular to the axis of the central axis 30, and the second axis is parallel to the line connecting the first and second transition zones.
[0038] When the plunger pump is started, the central axis 30 rotates, driving the cylinder body 40 in turn. This rotation also causes the multiple plunger rods 50 housed within the cylinder body 40 to rotate. Due to the displacement angle of the swash plate 60, the plunger rods 50 undergo a telescopic motion during rotation. As the multiple plunger rods 50 rotate about the central axis 30, they extend, creating a vacuum within the plunger bore, drawing oil through the intake port. They also compress, increasing the pressure within the bore and discharging oil through the discharge port. Each plunger rod 50 extends and contracts as it rotates, following the displacement angle of the swash plate 60. During the alternating process from discharge to intake and back again, the plunger rods 50 pass through a first transition zone and a second transition zone, ensuring a smoother pressure transition. Furthermore, the plunger travel within the first and second transition zones varies significantly depending on flow rates or the displacement angle of the swash plate 60. To ensure a smooth pressure transition, a staggered angle is designed. Due to the stagger angle, the distance from the first side of the swash plate 60 to the port plate 20 is shorter than the distance from the second side of the swash plate 60 to the port plate 20, with the second axis located between the first and second sides. Furthermore, the projection of the first side of the swash plate 60 along the axis of the central axis 30 is closer to the oil discharge port 22 of the port plate 20, while the projection of the second side of the swash plate 60 along the axis of the central axis 30 is closer to the oil intake port 21 of the port plate 20. When the plunger rod 50 reciprocates, it exerts a force parallel to the axis of the central axis 30 on the swash plate 60. Due to the stagger angle, this force is divided into two components: one parallel to the axis of the central axis 30 and the other perpendicular to the axis of the central axis 30. The component parallel to the axis of the central axis 30 is transmitted to the plunger pump housing 10, while the component perpendicular to the axis of the central axis 30 is borne by the swash plate 60 itself. This reduces the stability of the swash plate 60 and shortens its service life.
[0039] The first support portion 70 is located within the housing 10. It is movably connected to the swash plate 60, allowing them to rotate relative to each other when adjusting the displacement angle of the swash plate 60. The first support portion 70 is clamped between a first side of the swash plate 60 and the inner wall of the housing 10. Because the lateral forces acting on the swash plate 60 are perpendicular to the central axis 30 and located near the oil drain port 22, the first support portion 70 can absorb these forces, thereby improving the stability and service life of the swash plate 60.
[0040] In this embodiment, if Figure 2 As shown, the first support portion 70 may include a first spherical seat 71, which is spherically hinged to the swash plate 60. The first spherical seat 71 is clamped between a first side of the swash plate 60 and the inner wall of the housing 10. Lateral forces acting on the swash plate 60 are transmitted to the first spherical seat 711, with the first support portion 70 and the housing 10 bearing the lateral forces, thereby improving the life of the swash plate 60.
[0041] In this embodiment, if Figure 4 As shown, the first support portion 70 may further include a first bushing 72. A mounting groove is provided on the swash plate 60. The swash plate 60 is spherically hinged to the first spherical seat 71 through the first bushing 72, and the first bushing 72 is clamped between the first spherical seat 71 and the swash plate 60. The first spherical seat 71 is clamped between the first bushing 72 and the inner wall of the housing 10. The hardness of the first bushing 72 is less than the hardness of the first spherical seat 71 and the swash plate 60. The lateral force exerted on the swash plate 60 is first transmitted to the first bushing 72 and then acts on the first spherical seat 71. The first bushing 72 with lower hardness can act as a buffer, so that the force exerted on the first spherical seat 71 is smaller and more uniform, thereby improving the service life of the first support portion 70.
[0042] In this embodiment, if Figure 2 As shown, the swash plate 60 has a first oil hole 61 on its first side, a second oil hole 73 on its first bushing 72, and a third oil hole 74 on its first spherical seat 71. The first oil hole 61 communicates with the inner cavity of the housing 10, and the third oil hole 74 communicates with the first oil hole 61 via the second oil hole 73. The third oil hole 74 then communicates with the inner cavity of the housing 10. The oil can enter the first oil hole 61 and the third oil hole 74 through the inner cavity of the housing 10, and then enter the second oil hole 73 through the first oil hole 61 or the third oil hole 74, and then the oil can enter the contact surface between the swash plate 60 and the first bushing 72, the contact surface between the first bushing 72 and the first spherical seat 71, and the contact surface between the first spherical seat 71 and the housing 10, thereby forming a layer of oil film on each contact surface, which plays a role in lubrication and pressure bearing, reduces the wear caused by the force between the swash plate 60, the first bushing 72, the first spherical seat 71 and the housing 10, and improves the service life of the first support part 70.
[0043] In this embodiment, if Figure 2 As shown, the diameter of the first oil hole 61 can be larger than that of the second oil hole 73, and the diameter of the second oil hole 73 can be smaller than that of the third oil hole 74. The second oil hole 73 penetrates the first bushing 72, which is flanked by the swash plate 60 and the first spherical seat 71, respectively. This minimizes the diameter of the second oil hole 73, allowing more oil in the first oil hole 61 and the third oil hole 74 to be trapped and accumulated at both ends of the second oil hole 73. This allows more oil to enter the contact surfaces between the swash plate 60 and the first bushing 72, and between the first bushing 72 and the first spherical seat 71, ensuring the thickness of the oil film on these contact surfaces and preventing lubrication failure due to excessive thinning caused by lateral forces.
[0044] In this embodiment, if Figure 2 and 3As shown, the first spherical seat 71 includes a first ball head 711 and a first base 712, and the first ball head 711 and the first base 712 are integrally formed. The third oil hole 74 passes through the first ball head 711. The first base 712 is provided with a first connecting groove 713 and a second connecting groove 714 that intersect perpendicularly. The third oil hole 74 is connected to the inner cavity of the housing 10 through the first connecting groove 713 and the second connecting groove 714. The third oil hole 74 is located at the intersection of the first connecting groove 713 and the second connecting groove 714. The first connecting groove 713 and the second connecting groove 714 allow more oil to enter the third oil hole 74, thereby achieving better lubrication between the first base 712 and the housing 10. In addition, the design of the first connecting groove 713 and the second connecting groove 714 also reduces the weight of the first spherical seat 71, achieving a certain degree of lightweighting.
[0045] In this embodiment, if Figure 3 As shown, the opening width of the first oil groove can gradually increase in a direction away from the third oil hole 74, and the opening width of the second oil groove can gradually increase in a direction away from the third oil hole 74. The opening width is larger at the end closer to the outside of the first base 712, so that the oil in the inner cavity of the housing 10 can more easily enter the first connecting groove 713 and the second connecting groove 714 and then enter the third oil hole 74, which helps to form an oil film with a stable thickness between the first ball head 711 and the first bushing 72.
[0046] In this embodiment, the first spherical seat 71 can be made of any of bearing steel, carburized steel, or nitrided steel. The first bushing 72 can be made of a copper alloy, and its surface can be silver-plated. Alternatively, the first bushing 72 can be made of an aluminum alloy. The higher hardness of the first spherical seat 71 provides greater wear resistance and a longer lifespan. The lower hardness of the first bushing 72 provides better cushioning.
[0047] In this embodiment, if Figure 2 As shown, the axial piston pump with a swash plate 60 support structure may further include a second support portion 80. Second support portion 80 is located within housing 10, clamped between the second side of swash plate 60 and the inner wall of housing 10, and spherically hinged to swash plate 60. The opposing arrangement of first support portion 70 and second support portion 80 ensures uniform force distribution on both sides of swash plate 60, improving the swash plate 60's resistance to bending.
[0048] The second support portion 80 can include a second spherical seat 81 and a second bushing 82. The second spherical seat 81 is spherically hinged to the swash plate 60 via the second bushing 82. The second bushing 82 is held between the second side of the swash plate 60 and the second spherical seat 81, and the second spherical seat 81 is held between the second bushing 82 and the inner wall of the housing 10. The second support portion 80 can transmit forces acting on the swash plate 60 to the housing 10, thereby improving the life of the swash plate 60. The second spherical seat 81 can be of high hardness to withstand loads, while the second bushing 82 can be of low hardness to provide a cushioning effect.
[0049] In this embodiment, if Figure 2 As shown, the second side of the swash plate 60 has a fourth oil hole 62, the second bushing 82 has a fifth oil hole 83, and the second spherical seat 81 has a sixth oil hole 84. The fourth oil hole 62 communicates with the sixth oil hole 84 through the fifth oil hole 83. The fourth oil hole 62 and the sixth oil hole 84 are each connected to the inner cavity of the housing 10. Oil can enter the fourth oil hole 62, the fifth oil hole 83, and the sixth oil hole 84 in sequence through the inner cavity of the housing 10. The oil then enters the contact surfaces between the swash plate 60 and the second bushing 82, the second bushing 82 and the second spherical seat 81, and the second spherical seat 81 and the housing 10, forming an oil film that provides lubrication and prevents wear between the swash plate 60, the second bushing 82, the second spherical seat 81, and the housing 10, which could affect the life of the second support portion 80. The diameters of the fourth, fifth, and sixth oil holes 62, 83, and 84 can be equal because the second support portion 80 is not subject to lateral forces. If the diameters of the fourth, fifth, and sixth oil holes 62, 83, and 84 were inconsistent, oil would accumulate at the interface of these different diameters, resulting in uneven oil film thickness and affecting stability. Conversely, the diameter of the second oil hole 73 is smaller than that of the first and third oil holes 61, 74 because the oil film accumulated on the contact surface is squeezed and thinned by lateral forces, resulting in a more uniform oil film thickness.
[0050] In another embodiment, the second support portion 80 needs to bear a smaller force, so the second support portion 80 can be smaller in size than the first support portion 70 , and the second support portion 80 may not be provided with an oil hole.
[0051] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and that in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.
Claims
1. An axial piston pump with a swash plate support structure, characterized in that: The axial piston pump with a swash plate support structure includes: case; A distribution plate, the distribution plate is located in the housing; the distribution plate is detachably connected to the housing; the distribution plate has an oil suction port and an oil discharge port; the area where the oil discharge port transitions to the oil suction port is a first transition area; the area where the oil suction port transitions to the oil discharge port is a second transition area; A central shaft, the central shaft being disposed in the housing; the central shaft being rotatably connected to the housing; A cylinder body, the cylinder body is located in the housing; one end of the cylinder body is in contact with the distribution plate; the cylinder body is detachably connected to the central shaft; the central shaft drives the cylinder body to rotate; the cylinder body has a plurality of plunger holes; A plurality of plunger rods, the plunger rods being located in the housing; the plunger rods being arranged around the central axis; the plunger rods being parallel to the central axis; the plunger rods corresponding to the plunger holes one by one; and the plunger rods being slidably inserted into the plunger holes; a swash plate, the swash plate being located within the housing; the swash plate being rotatably connected to the housing; an angle at which the swash plate rotates about a first axis being a displacement angle; an angle at which the swash plate rotates about a second axis being a stagger angle; the first axis, the second axis, and the axis of the central axis being perpendicular to each other; and the second axis being parallel to a line connecting the first transition region and the second transition region. a first support portion, the first support portion being located within the housing; the first support portion being movably connected to the swash plate, the distance from the first side of the swash plate to the valve plate being smaller than the distance from the second side of the swash plate to the valve plate; the first support portion being clamped between the first side of the swash plate and the inner wall of the housing; The first support portion includes a first spherical seat; the first spherical seat is articulated with the swash plate; the first spherical seat is clamped between the first side of the swash plate and the inner wall of the housing; The first support portion also includes a first bushing; the swash plate has a mounting groove; the swash plate is articulated with the first spherical seat through the first bushing; the first bushing is clamped between the first spherical seat and the swash plate; the first spherical seat is clamped between the first bushing and the inner wall of the housing; the hardness of the first bushing is less than the hardness of the first spherical seat and the swash plate.
2. The axial piston pump with a swash plate support structure according to claim 1, characterized in that: The first side of the swash plate has a first oil hole; the first bushing has a second oil hole; the first spherical seat has a third oil hole; the first oil hole is connected to the inner cavity of the shell; the third oil hole is connected to the first oil hole through the second oil hole; the third oil hole is connected to the inner cavity of the shell.
3. The axial piston pump with a swash plate support structure according to claim 2, characterized in that: The diameter of the first oil hole is larger than that of the second oil hole; and the diameter of the second oil hole is smaller than that of the third oil hole.
4. The axial piston pump with a swash plate support structure according to claim 2, characterized in that: The first spherical seat includes a first ball head and a first base; the first ball head and the first base are integrally formed; the third oil hole passes through the first ball head; the first base is provided with a first connecting groove and a second connecting groove that intersect vertically; the third oil hole is connected to the inner cavity of the shell through the first connecting groove and the second connecting groove; the third oil hole is located at the intersection of the first connecting groove and the second connecting groove.
5. The axial piston pump with a swash plate support structure according to claim 4, characterized in that: The opening width of the first communicating groove gradually increases in a direction away from the third oil hole; the opening width of the second communicating groove gradually increases in a direction away from the third oil hole.
6. The axial piston pump with a swash plate support structure according to claim 1, characterized in that: The material of the first spherical seat is any one of bearing steel, carburizing steel, and nitriding steel; The first bushing is made of copper alloy, and the surface of the first bushing is plated with a silver film; or the first bushing is made of aluminum alloy.
7. The axial piston pump with a swash plate support structure according to claim 1, characterized in that: The axial piston pump with a swash plate support structure further includes a second support portion; the second support portion is located in the housing; the second support portion is clamped between the second side of the swash plate and the inner wall of the housing; the second support portion is hinged to the swash plate ball; The second support portion includes a second spherical seat and a second bushing; the second spherical seat is hinged to the swash plate ball through the second bushing; the second bushing is clamped between the second side of the swash plate and the second spherical seat; the second spherical seat is clamped between the second bushing and the inner wall of the housing.
8. The axial piston pump with a swash plate support structure according to claim 7, characterized in that: The second side of the swash plate has a fourth oil hole; the second bushing has a fifth oil hole; the second spherical seat has a sixth oil hole; the fourth oil hole is connected to the sixth oil hole through the fifth oil hole; the fourth oil hole and the sixth oil hole are respectively connected to the inner cavity of the shell; the diameters of the fourth oil hole, the fifth oil hole and the sixth oil hole are equal.
Citation Information
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