Hydraulic pump, power system and vehicle

Abstract

The utility model belongs to vehicle technical field discloses a kind of hydraulic pump, power system and vehicle.The hydraulic pump includes shell, cylinder body, drive shaft, back cover and sliding bearing.Cylinder body is rotatably arranged in shell around its axis, drive shaft is connected to the middle hole of cylinder body, and is fixed with cylinder body in circumference, cylinder body is provided with first passage, and first passage is communicated with middle hole.Back cover is connected to one end of shell, sliding bearing is connected to back cover, and is coaxially connected to drive shaft, back cover is provided with second passage, and the lubrication space of sliding bearing is communicated with the outlet of second passage, the inlet of second passage is communicated with the outlet of first passage, and lubrication space is communicated with middle hole.Oil in middle hole can be circulated in first passage, second passage, lubrication space and middle hole in turn under the rotation of cylinder body.The hydraulic pump can simplify structure, and realize heat dissipation and lubrication at sliding bearing without additional device.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a hydraulic pump, a power system, and a vehicle. Background Technology

[0002] In piston-type hydraulic pumps, sliding bearings are generally installed to support the drive shaft and bear the load during cylinder rotation, ensuring smooth hydraulic operation.

[0003] Current lubrication methods for sliding bearings involve creating air guide holes or axial ventilation holes on the bearing, with hydraulic oil being driven by a gear on one side of the bearing for both cooling and lubrication. However, this lubrication method is not suitable for hydraulic pumps where the sliding bearing lacks gears on either side. When there are no gears on the left or right side of the sliding bearing, frictional heat dissipation at the bearing location cannot be effectively addressed.

[0004] Therefore, there is an urgent need for a hydraulic pump, power system, and vehicle to solve the above problems. Utility Model Content

[0005] According to one aspect of the present invention, the objective is to provide a hydraulic pump that simplifies the structure and achieves heat dissipation and lubrication at the sliding bearing without the need for additional devices.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Hydraulic pump, including:

[0008] The housing, cylinder, and drive shaft are provided. The cylinder is rotatably disposed in the housing about its own axis. The drive shaft passes through and is connected to the central hole of the cylinder and is fixed to the cylinder in the circumferential direction. The cylinder has a first channel that communicates with the central hole.

[0009] The rear cover and the sliding bearing are provided. The rear cover is connected to one end of the housing, and the sliding bearing is connected to the rear cover and coaxially connected to the drive shaft. The rear cover has a second channel with an outlet connected to the lubrication space of the sliding bearing. The inlet of the second channel is connected to the outlet of the first channel. The lubrication space is connected to the central hole.

[0010] The oil in the central hole can circulate sequentially in the first channel, the second channel, the lubrication space, and the central hole under the rotation of the cylinder.

[0011] As a preferred embodiment of the hydraulic pump provided by this utility model, there are multiple first channels, and the multiple first channels are opened at intervals along the circumference of the central hole in the cylinder body.

[0012] As a preferred embodiment of the hydraulic pump provided by this utility model, a plurality of first channels are evenly spaced along the circumferential interval of the central hole in the cylinder body.

[0013] As a preferred embodiment of the hydraulic pump provided by this utility model, the first channel is inclined and extends toward the rear cover, and the angle between the first channel and the axial direction of the cylinder body is an acute angle.

[0014] As a preferred embodiment of the hydraulic pump provided by this utility model, the sliding bearing includes an inner ring structure and an outer ring structure, the inner ring structure and the outer ring structure are coaxially and rotatably fitted together, the lubrication space is formed between the inner ring structure and the outer ring structure, the drive shaft passes through the inner ring structure and is fixed relative to the inner ring structure in the circumferential direction, the outer ring structure is fixed to the rear cover and has a through hole, the through hole is connected to the lubrication space and the second channel.

[0015] As a preferred embodiment of the hydraulic pump provided by this utility model, the inner wall of the inner ring structure is provided with a bearing spline structure, the drive shaft is provided with a first spline shaft segment, the first spline shaft segment passes through the inner ring structure and is fitted with the bearing spline structure; and / or,

[0016] The outer ring structure has a receiving cavity on the side facing the inner ring structure, the receiving cavity is connected to the lubrication space, and the through hole is opened at the bottom of the receiving cavity.

[0017] As a preferred embodiment of the hydraulic pump provided by this utility model, the inner wall of the central hole is provided with a central hole spline structure, and the drive shaft is provided with a second spline shaft section, which is coaxially inserted through the central hole and interlocked with the central hole spline structure.

[0018] As a preferred embodiment of the hydraulic pump provided by this utility model, the hydraulic pump further includes a swashplate and multiple plungers. The swashplate is fixedly disposed within the housing, with its inclined surface facing the cylinder body. The cylinder body has multiple hydraulic oil holes, which are evenly distributed circumferentially within the cylinder body. The axial direction of the hydraulic oil holes is parallel to the axial direction of the cylinder body. Each plunger is correspondingly and movably inserted into one of the hydraulic oil holes along the axis. The ends of the plungers are slidably connected to the inclined surface of the swashplate. The rear cover has an oil guide channel that communicates with the hydraulic oil holes, allowing the hydraulic oil in the hydraulic oil holes to be discharged through the oil guide channel.

[0019] According to another aspect of the present invention, the objective is to provide a power system comprising an electric motor, a hydraulic motor, and an engine, and further comprising a hydraulic pump as described in any of the above embodiments, wherein the drive shaft is connected to the electric motor, the hydraulic oil outlet of the hydraulic pump is connected to the hydraulic motor, the hydraulic motor is connected to the flywheel of the engine, the electric motor is capable of driving the drive shaft to rotate, and the hydraulic motor is capable of driving the flywheel to rotate under the drive of hydraulic oil, thereby starting the engine.

[0020] According to another aspect of the present invention, the object is to provide a vehicle comprising a power system as described above.

[0021] The beneficial effects of this utility model are:

[0022] The hydraulic pump provided by this utility model includes a housing, a cylinder, a drive shaft, a rear cover, and a sliding bearing. The cylinder is rotatably mounted within the housing about its own axis. The drive shaft passes through and is connected to the central hole of the cylinder, and is fixed to the cylinder in the circumferential direction. The cylinder has a first channel communicating with the central hole. The communication between the first channel and the central hole allows for the flow of oil between them. The rear cover is connected to one end of the housing, and the sliding bearing is connected to the rear cover and coaxially connected to the drive shaft. The rear cover has a second channel with an outlet communicating with the lubrication space of the sliding bearing. The inlet of the second channel is connected to the outlet of the first channel, and the lubrication space is connected to the central hole. Oil in the central hole can be splashed into the second channel through the first channel under the rotation of the cylinder, enter the lubrication space, and then return to the central hole. Through the second channel, the oil from the first channel can be guided to the lubrication space. By connecting the lubrication space and the central hole, the oil in the lubrication space can flow into the central hole, thereby realizing the circulation of oil in the central hole, the first channel, the second channel, the lubrication space and back to the central hole. Thus, without the need for additional devices, heat dissipation and lubrication at the sliding bearing can be achieved, which can effectively simplify the structure. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0024] Figure 1 This is an axial sectional view of the hydraulic pump provided in this embodiment of the utility model;

[0025] Figure 2 yes Figure 1 A magnified view of a section marked A in the middle;

[0026] Figure 3 This is a cross-sectional schematic diagram of the outer ring structure of the sliding bearing provided in this embodiment of the utility model;

[0027] Figure 4 This is a cross-sectional schematic diagram of the cylinder provided in an embodiment of the present invention.

[0028] In the picture:

[0029] 100. Shell;

[0030] 200, Cylinder block; 210, Central bore; 211, Central bore spline structure; 220, First channel; 230, Hydraulic oil hole;

[0031] 300. Drive shaft;

[0032] 400, Rear cover; 410, Second channel; 420, Oil guide channel;

[0033] 500, sliding bearing; 510, inner ring structure; 520, outer ring structure; 521, through hole; 522, receiving cavity;

[0034] 600, swashplate;

[0035] 700, plunger; 710, ball head;

[0036] 800, Ski boots;

[0037] 900, Distribution plate. Detailed Implementation

[0038] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] 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.

[0042] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connect," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In this embodiment, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0046] The embodiments of this utility model 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 this utility model, and should not be construed as limiting this utility model.

[0047] Figure 1 An axial sectional view of a hydraulic pump provided in an embodiment of the present invention is shown. (Refer to...) Figure 1 This embodiment provides a hydraulic pump, a power system, and a vehicle. The power system includes an electric motor, a hydraulic motor, and an engine, and also includes the hydraulic pump provided in this embodiment. The vehicle includes the power system provided in this embodiment. The power system can provide a power source for the vehicle.

[0048] Specifically, the hydraulic pump includes a housing 100, a cylinder 200, a drive shaft 300, a rear cover 400, and a sliding bearing 500. One end of the drive shaft 300 is connected to a motor, and the hydraulic oil outlet of the hydraulic pump is connected to the hydraulic motor. The hydraulic motor is connected to the flywheel of the engine. The motor can drive the drive shaft 300 to rotate, and the hydraulic motor can drive the flywheel to rotate under the drive of hydraulic oil, thereby starting the engine.

[0049] More specifically, the cylinder 200 is rotatably mounted in the housing 100 around its own axis under the drive of the drive shaft 300. The drive shaft 300 passes through the central hole 210 of the cylinder 200 and is fixed to the cylinder 200 in the circumferential direction. The rear cover 400 is connected to one end of the housing 100, and the sliding bearing 500 is connected to the rear cover 400 and coaxially connected to the drive shaft 300 to support the drive shaft 300 and bear the load it brings, ensuring the smooth operation of the hydraulic system.

[0050] More specifically, the hydraulic pump also includes a swashplate 600 and multiple plungers 700. The swashplate 600 is fixedly disposed on the inner side of the end of the housing 100 away from the rear cover 400. The inclined surface of the swashplate 600 faces the cylinder body 200. The cylinder body 200 has multiple hydraulic oil holes 230, which are evenly distributed circumferentially on the cylinder body 200, and the axial direction of the hydraulic oil holes 230 is parallel to the axial direction of the cylinder body 200. The plungers 700 are correspondingly and movably inserted into the hydraulic oil holes 230 along the axis, and the ends of the plungers 700 are slidably connected to the inclined surface of the swashplate 600. The rear cover 400 has an oil guide channel 420, the outlet of which is the hydraulic oil outlet of the hydraulic pump. The oil guide channel 420 is connected to the hydraulic oil hole 230, and the hydraulic oil in the hydraulic oil hole 230 can be discharged through the oil guide channel 420.

[0051] Preferably, the hydraulic pump further includes a plurality of slippers 800. Each slipper 800 is located between the ball end 710 of the plunger 700 and the inclined surface of the swashplate 600. The slipper 800 has an arc-shaped groove in which the ball end 710 is movably accommodated. The flat bottom of the slipper 800 slidably rests against the inclined surface of the swashplate 600. There is an inclination angle between the inclined surface of the swashplate 600 and the axis of the cylinder 200. When the cylinder 200 rotates under the drive of the drive shaft 300, the swashplate 600 applies a thrust to the ball end 710 of the plunger 700 through the slippers 800, causing the plunger 700 to reciprocate within the hydraulic oil port 230 of the cylinder 200. The slipper 800 can reduce friction through the principle of hydrostatic bearing. When the plunger 700 moves, the bottom of the flat surface of the slipper 800 is in close contact with the inclined surface of the swashplate 600. At the same time, the inner spherical surface of the arc groove forms a spherical contact with the ball head 710, which transforms the point contact of the plunger 700 into a spherical contact and reduces the contact stress.

[0052] More specifically, the hydraulic pump also includes a distribution plate 900, which is fixedly mounted on the side of the rear cover 400 facing the cylinder body 200. The distribution plate 900 mainly realizes the oil suction and pressure functions of the hydraulic pump by controlling the switching of the oil circuit. The distribution plate 900 is prior art, and its structure and switching principle will not be described in detail in this embodiment.

[0053] Continue to refer to Figure 1 The cylinder body 200 has a first channel 220 connected to the central hole 210. The rear cover 400 has a second channel 410 with an outlet connected to the lubrication space of the sliding bearing 500. The inlet of the second channel 410 is connected to the outlet of the first channel 220, and the lubrication space is connected to the central hole 210. Oil in the central hole 210 can be splashed into the second channel 410 through the first channel 220 under the rotation of the cylinder body 200, and then enter the lubrication space before returning to the central hole 210. The connection between the first channel 220 and the central hole 210 allows for the flow of oil between them. Through the second channel 410, the oil from the first channel 220 can be guided to the lubrication space. Through the connection between the lubrication space and the central hole 210, the oil in the lubrication space can flow into the central hole 210, thereby realizing the circulation of oil through the central hole 210, the first channel 220, the second channel 410, the lubrication space and back to the central hole 210. Thus, without the need for additional devices, heat dissipation and lubrication at the sliding bearing 500 can be achieved, which can effectively simplify the structure.

[0054] Specifically, the first channel 220 is inclined and extends towards the rear cover 400, and the angle α between the first channel 220 and the axial direction of the cylinder 200 is an acute angle. Preferably, in this embodiment, the angle α can be 30° or 45°. In other embodiments, the angle α can also be other acute angles, as long as it can guide oil to the inlet of the second channel 410. The specific angle value can be determined according to the processing convenience of the hydraulic pump. It should be noted that after the first channel 220 is processed, it is necessary to ensure that there are no iron filings or burrs inside.

[0055] Continue to refer to Figure 1 The rear cover 400 has mounting holes, and the sliding bearing 500 is fixedly mounted in the mounting holes in the circumferential direction. The sliding bearing 500 includes an inner ring structure 510 and an outer ring structure 520. The inner ring structure 510 and the outer ring structure 520 are coaxially and rotatably fitted together. The lubrication space is formed between the inner ring structure 510 and the outer ring structure 520. The drive shaft 300 passes through the inner ring structure 510 and is fixedly mounted to the inner ring structure 510 in the circumferential direction. The outer ring structure 520 is fixedly connected to the mounting holes of the rear cover 400, and its side wall has a through hole 521. The through hole 521 connects the lubrication space and the second channel 410. Figure 2 As shown.

[0056] Specifically, the inner wall of the inner ring structure 510 is provided with a bearing spline structure, and the drive shaft 300 is provided with a first spline shaft segment, which passes through the inner ring structure 510 and engages with the bearing spline structure. Through the cooperation of the first spline shaft segment and the bearing spline structure, the assembly of the sliding bearing 500 and the drive shaft 300 can be simplified, and the relative fixation of the inner ring structure 510 and the drive shaft 300 in the circumferential direction can be ensured.

[0057] Figure 3 This diagram shows a cross-sectional view of the outer ring structure of the sliding bearing provided in an embodiment of the present invention. (Refer to...) Figure 2 and Figure 3 The outer ring structure 520 has a receiving cavity 522 on the side facing the inner ring structure 510. The receiving cavity 522 is connected to the lubrication space, and the through hole 521 is formed at the bottom of the receiving cavity 522. The receiving cavity 522 is specifically annular, which can expand the space in the lubrication space for containing oil and improve the lubrication effect of the oil between the inner ring structure 510 and the outer ring structure 520 in the lubrication space.

[0058] Figure 4 A cross-sectional schematic diagram of the cylinder block provided in an embodiment of the present invention is shown. (Refer to...) Figure 1 and Figure 4The inner wall of the central hole 210 is provided with a central hole spline structure 211, and the drive shaft 300 is provided with a second spline shaft segment. The second spline shaft segment is coaxially inserted through the central hole 210 and is engaged with the central hole spline structure 211. Through the cooperation of the central hole spline structure 211 and the second spline shaft segment, the assembly method of the drive shaft 300 and the cylinder block 200 can be simplified, the coaxial connection of the drive shaft 300 and the cylinder block 200 can be achieved, and the relative fixation of the two in the circumferential direction can be ensured.

[0059] Specifically, there are multiple first channels 220, which are spaced apart from each other along the circumference of the central hole 210 in the cylinder body 200. With the above arrangement, oil can be thrown from different first channels 220 to the second channel 410 during the rotation of the cylinder body 200, thereby maximizing the continuity of oil intake in the second channel 410 and improving the continuity of the oil circulation process in the central hole 210, first channels 220, second channels 410, lubrication space and back to the central hole 210.

[0060] Preferably, a plurality of the first channels 220 are evenly spaced along the circumferential interval of the central hole 210 in the cylinder body 200. In this embodiment, the first channels 220 are specifically three or six. When there are three, the included angle β between two adjacent first channels 220 is specifically 210°.

[0061] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. Hydraulic pump, characterized in that include: The housing (100), cylinder (200), and drive shaft (300) are provided. The cylinder (200) is rotatably disposed in the housing (100) about its own axis. The drive shaft (300) is connected through the central hole (210) of the cylinder (200) and is fixed to the cylinder (200) in the circumferential direction. The cylinder (200) has a first channel (220) that communicates with the central hole (210). The rear cover (400) and the sliding bearing (500) are connected to one end of the housing (100), the sliding bearing (500) is connected to the rear cover (400) and coaxially connected to the drive shaft (300), the rear cover (400) has a second channel (410) with an outlet connected to the lubrication space of the sliding bearing (500), the inlet of the second channel (410) is connected to the outlet of the first channel (220), and the lubrication space is connected to the central hole (210). The oil in the central hole (210) can circulate sequentially in the first channel (220), the second channel (410), the lubrication space and the central hole (210) under the rotation of the cylinder (200).

2. The hydraulic pump of claim 1, wherein, There are multiple first channels (220), and the multiple first channels (220) are spaced apart from each other along the circumference of the central hole (210) in the cylinder body (200).

3. The hydraulic pump of claim 2, wherein, Multiple first channels (220) are evenly spaced along the circumferential spacing of the central hole (210) in the cylinder body (200).

4. The hydraulic pump of claim 1, wherein, The first channel (220) is inclined and extends toward the rear cover (400), and the angle between the first channel (220) and the axial direction of the cylinder (200) is acute.

5. The hydraulic pump of claim 1, wherein, The sliding bearing (500) includes an inner ring structure (510) and an outer ring structure (520). The inner ring structure (510) and the outer ring structure (520) are coaxially and rotatably fitted together. The lubrication space is formed between the inner ring structure (510) and the outer ring structure (520). The drive shaft (300) passes through the inner ring structure (510) and is fixed relative to the inner ring structure (510) in the circumferential direction. The outer ring structure (520) is fixed to the rear cover (400) and has a through hole (521). The through hole (521) connects the lubrication space and the second channel (410).

6. The hydraulic pump of claim 5, wherein, The inner ring structure (510) has a bearing spline structure on its inner wall, and the drive shaft (300) has a first spline shaft segment, which passes through the inner ring structure (510) and engages with the bearing spline structure; and / or, The outer ring structure (520) has a receiving cavity (522) on the side facing the inner ring structure (510), the receiving cavity (522) is connected to the lubrication space, and the through hole (521) is opened at the bottom of the receiving cavity (522).

7. The hydraulic pump of claim 1, wherein, The inner wall of the central hole (210) is provided with a central hole spline structure (211), and the drive shaft (300) is provided with a second spline shaft segment. The second spline shaft segment is coaxially inserted through the central hole (210) and is fitted with the central hole spline structure (211).

8. Hydraulic pump according to any of claims 1-7, characterized in that The hydraulic pump also includes a swashplate (600) and multiple plungers (700). The swashplate (600) is fixedly disposed within the housing (100), with its inclined surface facing the cylinder body (200). The cylinder body (200) has multiple hydraulic oil holes (230) evenly distributed circumferentially on the cylinder body (200). The axial direction of the hydraulic oil holes (230) is parallel to the axis of the cylinder body (200). The plungers (700) are parallel in direction and are movably inserted into the hydraulic oil holes (230) along the axis. The ends of the plungers (700) are slidably connected to the inclined surfaces of the swashplate (600). The rear cover (400) has an oil guide channel (420) which is connected to the hydraulic oil holes (230). The hydraulic oil in the hydraulic oil holes (230) can be discharged through the oil guide channel (420).

9. A power system characterized by, The device includes an electric motor, a hydraulic motor, and an engine, and also includes a hydraulic pump as described in any one of claims 1-8. The drive shaft (300) is connected to the electric motor, the hydraulic oil outlet of the hydraulic pump is connected to the hydraulic motor, the hydraulic motor is connected to the flywheel of the engine, the electric motor is capable of driving the drive shaft (300) to rotate, and the hydraulic motor is capable of driving the flywheel to rotate under the drive of hydraulic oil to start the engine.

10. Vehicle, characterized in that Includes the power system as described in claim 9.

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