A plunger type hydraulic pump and hydraulic system

Abstract

The application provides a plunger type hydraulic pump and a hydraulic system, and relates to the field of hydraulic transmission. The plunger type hydraulic pump comprises a swash plate assembly, a driving shaft, a shell and an adjusting assembly; the swash plate assembly comprises a swash plate body and a support, and the swash plate body is rotationally arranged on the support; the driving shaft is provided with a first transmission part, the swash plate body is provided with a first clamping groove, and the first transmission part is in abutment with the inner wall of the first clamping groove along the circumference direction of the driving shaft; the shell is rotationally provided with a rotating support, the rotating support is arranged in the shell along the radial direction of the driving shaft, the rotating support is connected with the support, and the adjusting end of the adjusting assembly is connected with the rotating support. When the inclination angle of the swash plate body needs to be changed, the adjusting end of the adjusting assembly drives the rotating support to rotate, and then drives the support to rotate, so that the inclination angle of the support is adjusted. At this time, the inclination angle of the swash plate body changes synchronously with the inclination angle of the support. The adjusting process is efficient and stable, and is beneficial to the flexible adjustment of the displacement of the plunger type hydraulic pump.

Description

Technical Field

[0001] This invention relates to the field of hydraulic transmission, and more particularly to a plunger-type hydraulic pump and hydraulic system. Background Technology

[0002] A plunger-type hydraulic pump is an important component of a hydraulic system. It relies on the reciprocating motion of a plunger within a cylinder to change the volume of the sealed working chamber, thereby achieving oil suction and pressure. It has advantages such as high rated pressure, compact structure, high efficiency, and convenient flow adjustment.

[0003] Based on their working principles, piston hydraulic pumps are generally classified into single-piston pumps, horizontal piston pumps, axial piston pumps, and radial piston pumps. Among them, axial piston pumps can be further divided into swashplate type and swashplate type.

[0004] In swashplate axial piston pumps, the swashplate angle determines the reciprocating stroke of the piston, thus affecting the pump's displacement. However, existing swashplate axial piston pumps cannot efficiently and stably change the swashplate angle, and therefore cannot flexibly adjust the pump's displacement. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, one of the objectives of the present invention is to provide a plunger-type hydraulic pump.

[0006] This invention provides the following technical solution:

[0007] A piston-type hydraulic pump includes a swashplate assembly, a drive shaft, a housing, and an adjustment assembly;

[0008] The swash plate assembly is located inside the housing. The swash plate assembly includes a swash plate body and a support. The swash plate body is rotatably mounted on the support about its own axis.

[0009] The drive shaft is provided with a first transmission component, and the swashplate body is provided with a first slot into which the first transmission component can be engaged. The first transmission component abuts against the inner wall of the first slot along the circumference of the drive shaft.

[0010] A rotating support is rotatably mounted on the housing. The rotating support passes through the housing along the radial direction of the drive shaft. The rotating support is connected to the bracket. The adjusting end of the adjusting assembly is connected to the rotating support.

[0011] As a further optional embodiment of the plunger-type hydraulic pump, the adjustment assembly includes an adjustment drive, a rocker arm, and a lever. The drive end of the adjustment drive is connected to the rocker arm, the rocker arm and the lever are rotatably engaged, and the lever is connected to the rotating support.

[0012] The lever is slidably engaged with the swing arm or the rotating support.

[0013] As a further alternative to the plunger-type hydraulic pump, the adjusting assembly also includes a rotating shaft, through which the rocker arm rotatably engages with the lever, and the rotating shaft slidably engages with either the rocker arm or the lever.

[0014] As a further alternative to the plunger-type hydraulic pump, the rocker arm is provided with a groove, the rotating shaft is slidably disposed in the groove, and the rotating shaft is connected to the end of the lever near the rocker arm.

[0015] As a further alternative to the plunger-type hydraulic pump, the rotating shaft is rotatably disposed within the slide groove, and the rotating shaft is fixedly connected to the lever.

[0016] As a further optional solution for the plunger-type hydraulic pump, a limiting boss is provided on the rotating support, and a limiting groove is provided at the end of the lever near the rotating support, with the limiting boss embedded in the limiting groove.

[0017] As a further alternative to the plunger-type hydraulic pump, the swashplate assembly also includes a first bearing, through which the swashplate body is rotatably mounted on the bracket.

[0018] As a further alternative to the plunger-type hydraulic pump, the outer side wall of the swashplate body has a shoulder, and a retaining ring is provided on the swashplate body.

[0019] The first bearing is disposed around the swashplate body, one side of the first bearing abuts against the shaft shoulder, and the other side of the first bearing abuts against the retaining ring.

[0020] As a further alternative to the plunger-type hydraulic pump, the inner wall of the bracket is provided with a limiting flange, and the first bearing abuts against the limiting flange.

[0021] Another object of the present invention is to provide a hydraulic system.

[0022] This invention provides the following technical solution:

[0023] A hydraulic system comprising the aforementioned plunger-type hydraulic pump.

[0024] The embodiments of the present invention have the following beneficial effects:

[0025] In the aforementioned plunger-type hydraulic pump, the housing is supported by a rotating support member, while the swashplate body rotates around its own axis and is mounted on the support. During operation, the adjusting end of the adjusting assembly, the rotating support member, and the support remain stationary, the tilt angle of the swashplate body remains constant, and the drive shaft drives the first transmission member to rotate. The first transmission member abuts against the inner wall of the first slot along the circumference of the drive shaft, and further drives the swashplate body to rotate as it rotates with the drive shaft, thus enabling the plunger-type hydraulic pump to operate normally. During this process, the swashplate body rotates around its own axis, and its axis of rotation does not coincide with the axis of rotation of the first transmission member. Therefore, the first transmission member moves relative to the swashplate body within the first slot along the axial direction of the drive shaft.

[0026] When the tilt angle of the swashplate needs to be changed, the adjusting end of the adjusting component drives the rotating support to rotate, which in turn drives the bracket to rotate, thus adjusting the tilt angle of the bracket. At this time, the tilt angle of the swashplate changes synchronously with the tilt angle of the bracket. The adjustment process is efficient and stable, which is beneficial for flexibly adjusting the displacement of the piston hydraulic pump.

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This diagram illustrates the overall structure of a plunger-type hydraulic pump according to an embodiment of the present invention.

[0030] Figure 2 This diagram illustrates the internal structure of a plunger-type hydraulic pump according to an embodiment of the present invention.

[0031] Figure 3 It shows Figure 2 Enlarged view of point A in the middle;

[0032] Figure 4 This diagram shows a cross-sectional view of a plunger-type hydraulic pump at the swashplate assembly according to an embodiment of the present invention.

[0033] Figure 5 A schematic diagram showing the fit between the swashplate assembly and the drive shaft in a plunger-type hydraulic pump provided by an embodiment of the present invention is shown.

[0034] Figure 6This diagram shows a cross-sectional view of a plunger-type hydraulic pump at the plunger assembly according to an embodiment of the present invention;

[0035] Figure 7 This diagram illustrates the structure of the oil distribution plate in a plunger-type hydraulic pump according to an embodiment of the present invention.

[0036] Figure 8 A schematic diagram of the adjusting component in a plunger-type hydraulic pump provided by an embodiment of the present invention is shown.

[0037] Explanation of key component symbols:

[0038] 100-Mounting base; 200-Housing; 210-Rotating support; 211-Limiting boss; 300-Drive motor; 310-Drive shaft; 311-First transmission component; 312-Second transmission component; 313-Second bearing; 314-First limiting ring; 315-Second limiting ring; 316-Spring; 400-Swashplate assembly; 410-Swashplate body; 411-Shoulder; 412-Retaining ring; 413-First slot; 420-Bracket; 421- Limiting flange; 430-First bearing; 431-Cage; 432-Ball; 500-Plunger assembly; 510-Plunger body; 511-Piston chamber; 512-Second groove; 520-Piston; 600-Oil distribution plate; 610-First flow channel; 620-Second flow channel; 630-Oil hole; 700-Adjusting assembly; 710-Adjusting drive; 720-Rocker arm; 721-Slide groove; 730-Pulley; 731-Limiting groove; 740-Shaft. Detailed Implementation

[0039] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0040] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0041] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0044] Example

[0045] Please refer to the following: Figure 1 and Figure 2 This embodiment provides a plunger-type hydraulic pump, specifically a straight-shaft swashplate plunger pump, which includes a mounting base 100, a housing 200, a drive motor 300, a swashplate assembly 400, a plunger assembly 500, a distributor plate 600, and an adjusting assembly 700. The housing 200, drive motor 300, and adjusting assembly 700 are all fixedly mounted on the mounting base 100. The swashplate assembly 400 and plunger assembly 500 are disposed within the housing 200. The distributor plate 600 is fixedly disposed at the end of the housing 200 away from the drive motor 300 and works in conjunction with the swashplate assembly 400 and plunger assembly 500 within the housing 200. Furthermore, the drive motor 300 has a drive shaft 310 that passes through the housing 200 and is drively connected to the swashplate assembly 400 and plunger assembly 500.

[0046] Specifically, the housing 200 is cylindrical, with one end closed and the other end open. The closed end of the housing 200 faces the drive motor 300, and the oil distribution plate 600 is fixedly installed at the open end of the housing 200.

[0047] Accordingly, the drive shaft 310 passes through the closed end of the housing 200 and enters the interior of the housing 200, and the axis of the drive shaft 310 coincides with the axis of the housing 200.

[0048] Please see Figure 3 Specifically, the swashplate assembly 400 includes a swashplate body 410 and a support 420. Both the swashplate body 410 and the support 420 are annular, and the axis of the swashplate body 410 coincides with the axis of the support 420. The swashplate body 410 is rotatably disposed inside the support 420 about its own axis.

[0049] In this embodiment, the swashplate assembly 400 further includes a first bearing 430, and the swashplate body 410 is rotatably mounted on the bracket 420 via the first bearing 430.

[0050] In some specific embodiments of this example, the first bearing 430 consists of a cage 431 and a plurality of balls 432, with the cage 431 arranged around the swashplate body 410. The plurality of balls 432 are embedded in the cage 431 and arranged circumferentially along the swashplate body 410.

[0051] Accordingly, the outer side wall of the swashplate body 410 has a shoulder 411, and the shoulder 411 is located on the side of the retainer 431 facing away from the closed end of the housing 200, and the shoulder 411 abuts against one side of the retainer 431. A retaining ring 412 is fixedly provided on the side of the swashplate body 410 facing the closed end of the housing 200, and the retaining ring 412 abuts against the other side of the retainer 431.

[0052] In addition, the inner wall of the bracket 420 is integrally formed with an annular limiting flange 421, and the limiting flange 421 abuts against the side of the retainer 431 facing the closed end of the housing 200.

[0053] In other specific embodiments of this example, the first bearing 430 may also be in other forms, such as a deep groove ball bearing 430, a needle roller bearing 430, etc.

[0054] Please see Figure 4 A rotating support member 210 is rotatably mounted on the housing 200. The rotating support member 210 passes through the housing 200 along the radial direction (which is also the radial direction of the drive shaft 310) and is connected to the bracket 420, so as to realize the rotational support of the housing 200 on the bracket 420.

[0055] When the aforementioned plunger-type hydraulic pump is working, the rotating support 210 and the bracket 420 remain stationary. Both the bracket 420 and the swashplate body 410 are in an inclined state, with the inclination angle being the angle between the axis of the bracket 420 and the axis of the housing 200, and the inclination angle remains constant.

[0056] Correspondingly, the adjusting end of the adjusting component 700 is connected to the rotating support 210, which can drive the rotating support 210 to rotate, thereby adjusting the tilt angle of the bracket 420 and thus adjusting the tilt angle of the swashplate body 410.

[0057] In some specific embodiments, two rotating support members 210 are provided. The two rotating support members 210 are symmetrically arranged about the axis of the housing 200, which can stably support the bracket 420, and the adjusting end of the adjusting assembly 700 is connected to one of the rotating support members 210.

[0058] Please refer to the following: Figure 4 and Figure 5 A first transmission member 311 is provided on the drive shaft 310, and a first slot 413 is provided on the inner side wall of the swashplate body 410 for the first transmission member 311 to be engaged. The first transmission member 311 abuts against the inner wall of the first slot 413 along the circumference of the drive shaft 310, and can move within the first slot 413 along the axial direction of the drive shaft 310.

[0059] When the aforementioned plunger-type hydraulic pump is working, the drive shaft 310 drives the first transmission component 311 to rotate, and the first transmission component 311 further drives the swashplate body 410 to rotate. The swashplate body 410 works in conjunction with the plunger assembly 500 and the distribution plate 600 to ensure the normal operation of the plunger-type hydraulic pump.

[0060] During this process, the swashplate body 410 rotates around its own axis, and its rotation axis 740 does not coincide with the rotation axis 741 of the first transmission member 311. Therefore, the first transmission member 311 moves relative to the swashplate body 410 in the first slot 413 along the axis of the drive shaft 310.

[0061] In some specific embodiments, the first transmission member 311 is a pin and passes through the drive shaft 310 along the radial direction. Correspondingly, the first slot 413 passes through the swashplate body 410 along the axial direction of the swashplate body 410.

[0062] Furthermore, two first slots 413 are provided on the inner sidewall of the swashplate body 410, and the two first slots 413 are symmetrical about the axis of the swashplate body 410. The two ends of the first transmission member 311 are respectively engaged in the first slots 413, so that the swashplate body 410 is evenly stressed when it is driven to rotate.

[0063] Please refer to the following: Figure 2 and Figure 6Specifically, the plunger assembly 500 consists of a plunger body 510 and multiple pistons 520. The plunger body 510 is arranged around the drive shaft 310, and multiple piston chambers 511 are provided on the side of the plunger body 510 facing the swashplate body 410. The pistons 520 are slidably disposed in the corresponding piston chambers 511 along the axial direction of the drive shaft 310, and the piston rods are ball-jointed to the swashplate body 410.

[0064] Please see Figure 6 A second transmission member 312 is provided on the drive shaft 310, and a second slot 512 is provided on the inner side wall of the plunger body 510 for the second transmission member 312 to be inserted into, and the second transmission member 312 abuts against the inner wall of the second slot 512 along the circumference of the drive shaft 310.

[0065] When the aforementioned plunger-type hydraulic pump is working, the drive shaft 310 drives the second transmission component 312 to rotate, and the second transmission component 312 further drives the plunger body 510 to rotate. The plunger body 510 and the swashplate body 410 have the same rotational angular velocity, and their rotation axes 740 intersect at an angle.

[0066] Taking the angle shown in the diagram as an example, during the counterclockwise rotation of the plunger body 510 and the swashplate body 410, the piston 520 on the left moves backward, creating a hollow cavity in the piston chamber 511 on the left, thereby drawing in hydraulic oil. The piston 520 on the right moves forward, generating pressure in the piston chamber 511 on the right, thereby pushing out the hydraulic oil.

[0067] In some specific embodiments, the second transmission member 312 also adopts a pin and passes through the drive shaft 310 along the radial direction. Similarly, the second slot 512 passes through the plunger body 510 along the axial direction of the plunger body 510, and two second slots 512 are symmetrically arranged about the axis of the plunger body 510. The two ends of the second transmission member 312 are respectively engaged in the second slots 512, so that the plunger body 510 is evenly stressed when driving the plunger body 510 to rotate.

[0068] Please refer to it again. Figure 2 Furthermore, a second bearing 313 is provided between the plunger body 510 and the drive shaft 310. A first limiting ring 314, a second limiting ring 315, and a spring 316 are also fitted on the drive shaft 310. The first limiting ring 314 abuts against the second bearing 313, and the spring 316 is located between the first limiting ring 314 and the second limiting ring 315.

[0069] Please refer to the following: Figure 2 and Figure 7 Specifically, the oil distribution plate 600 abuts against the plunger body 510, and the oil distribution plate 600 is provided with an arc-shaped first flow channel 610 and a second flow channel 620 on the side facing the plunger body 510.

[0070] The first flow channel 610 is connected to the piston chamber 511 located on the left side, and the second flow channel 620 is connected to the piston chamber 511 located on the right side.

[0071] In addition, the oil distribution plate 600 has multiple oil holes 630 on the side opposite to the plunger body 510. Some of the oil holes 630 are connected to the first flow channel 610, while the remaining oil holes 630 are connected to the second flow channel 620.

[0072] Please see Figure 8 Specifically, the adjustment assembly 700 includes an adjustment drive 710, a rocker arm 720, and a lever 730. The drive end of the adjustment drive 710 is connected to the rocker arm 720, and the rocker arm 720 is rotatably engaged with the lever 730. The lever 730 serves as the adjustment end of the entire adjustment assembly 700 and is connected to one of the rotating support members 210. Furthermore, the lever 730 is slidably engaged with either the rocker arm 720 or the rotating support member 210.

[0073] Optionally, the adjustment drive 710 is a servo motor. The housing of the servo motor is fixedly mounted on the mounting base 100, and the shaft of the servo motor is connected to the rocker arm 720.

[0074] The aforementioned rocker arm 720 and lever 730 form a linkage structure. The adjustment drive 710 can drive the rotating support 210 to rotate through this linkage structure, thereby driving the bracket 420 to rotate and adjusting the tilt angle of the bracket 420 and the swashplate body 410.

[0075] During this process, the lever 730 slides relative to the rocker arm 720 or the rotating support 210, allowing the length of the linkage structure to be adaptively adjusted.

[0076] In this embodiment, the adjustment assembly 700 further includes a rotating shaft 740, which is parallel to the shaft of the servo motor. The rocker arm 720 is rotatably engaged with the lever 730 via the rotating shaft 740, and the rotating shaft 740 is slidably engaged with either the rocker arm 720 or the lever 730.

[0077] Accordingly, the lever 730 is fixedly connected to the rotating support 210. The rotating support 210 is provided with a limiting boss 211, and the end of the lever 730 near the rotating support 210 is provided with a corresponding limiting groove 731, with the limiting boss 211 embedded within the limiting groove 731. When the lever 730 drives the rotating support 210 to rotate, torque is transmitted through the limiting boss 211.

[0078] In some specific embodiments of this example, the rocker arm 720 is provided with a slide groove 721, and the slide groove 721 is arranged along the radial direction of the servo motor shaft. The rotating shaft 740 is slidably disposed in the slide groove 721 and is connected to the end of the lever 730 near the rocker arm 720.

[0079] The rotating shaft 740 can be rotatably disposed in the slide groove 721 and fixedly connected to the lever 730, or it can be slidably disposed in the slide groove 721 and rotatably connected to the lever 730, or it can be rotatably disposed in the slide groove 721 and rotatably connected to the lever 730.

[0080] Optionally, the rotating shaft 740 is rotatably disposed within the slide groove 721, and the rotating shaft 740 is fixedly connected to the lever 730.

[0081] In some other specific embodiments of this example, a groove 721 may be provided on the lever 730, and the pivot 740 may be provided at the end of the lever 720 near the lever 730.

[0082] In another embodiment of this application, the lever 730 may also be slidably engaged with the rotating support 210.

[0083] In the aforementioned plunger-type hydraulic pump, when it is necessary to change the tilt angle of the swashplate body 410, the adjustment drive 710 is activated. This drives the rotating support 210 to rotate via a linkage structure formed by the rocker arm 720 and the lever 730, thereby causing the bracket 420 to rotate and adjusting its tilt angle. At this time, the tilt angle of the swashplate body 410 changes synchronously with the tilt angle of the bracket 420.

[0084] When the tilt angle of the swashplate body 410 decreases, the stroke of the piston 520 becomes shorter, resulting in a smaller displacement of the entire plunger hydraulic pump.

[0085] After the axis of the swashplate body 410 coincides with the axis of the drive shaft 310, the bracket 420 and the swashplate body 410 continue to rotate, causing the swashplate body 410 to tilt in the opposite direction, thereby adjusting the oil inlet and outlet direction of the piston hydraulic pump.

[0086] In summary, the above adjustment process is efficient and stable, which is conducive to flexibly adjusting the displacement of the plunger hydraulic pump.

[0087] This embodiment also provides a hydraulic system, including the above-described plunger-type hydraulic pump.

[0088] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0089] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0090] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A plunger-type hydraulic pump, characterized in that, Includes swashplate assembly, drive shaft, housing, and adjustment assembly; The swash plate assembly is located inside the housing. The swash plate assembly includes a swash plate body and a support. The swash plate body is rotatably mounted on the support about its own axis. The drive shaft is provided with a first transmission component, and the swashplate body is provided with a first slot into which the first transmission component can be engaged. The first transmission component abuts against the inner wall of the first slot along the circumference of the drive shaft. A rotating support is rotatably mounted on the housing. The rotating support passes through the housing along the radial direction of the drive shaft. The rotating support is connected to the bracket. The adjusting end of the adjusting assembly is connected to the rotating support. The adjustment assembly includes an adjustment drive, a rocker arm, and a lever. The drive end of the adjustment drive is connected to the rocker arm, the rocker arm and the lever are rotatably engaged, and the lever is connected to the rotation support. The lever is slidably engaged with the swing arm or the rotating support. The adjustment assembly also includes a rotating shaft, through which the rocker arm rotates in conjunction with the lever, and the rotating shaft slides in conjunction with either the rocker arm or the lever.

2. The plunger-type hydraulic pump according to claim 1, characterized in that, The swing arm is provided with a sliding groove, and the rotating shaft is slidably disposed in the sliding groove. The rotating shaft is connected to the end of the lever near the swing arm.

3. The plunger-type hydraulic pump according to claim 2, characterized in that, The rotating shaft is rotatably disposed within the sliding groove, and the rotating shaft is fixedly connected to the lever.

4. The plunger-type hydraulic pump according to any one of claims 1-3, characterized in that, The rotating support is provided with a limiting boss, and the end of the lever near the rotating support is provided with a corresponding limiting groove, and the limiting boss is embedded in the limiting groove.

5. The plunger-type hydraulic pump according to any one of claims 1-3, characterized in that, The swashplate assembly also includes a first bearing, and the swashplate body is rotatably mounted on the support via the first bearing.

6. The plunger-type hydraulic pump according to claim 5, characterized in that, The outer wall of the swash plate body has a shoulder, and a retaining ring is provided on the swash plate body; The first bearing is arranged around the swashplate body, one side of the first bearing abuts against the shaft shoulder, and the other side of the first bearing abuts against the retaining ring.

7. The plunger-type hydraulic pump according to claim 5, characterized in that, The inner sidewall of the bracket is provided with a limiting flange, and the first bearing abuts against the limiting flange.

8. A hydraulic system, characterized in that, Including the plunger-type hydraulic pump as described in any one of claims 1-7.

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