Crankshaft tilt cylinder type hydraulic motor
Through the design of the crankshaft swing cylinder hydraulic motor, the use of pistons and rolling bearings to transmit torque is solved, and the processing difficulties and wear problems of existing hydraulic motors are achieved, efficient operation without leakage and low friction losses is achieved, and service life is extended and stability is improved.
Patent Information
- Application Number
- CN202510775744.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-11
- Publication Date
- 2025-08-12
AI Technical Summary
The plunger-linking rod assembly structure of existing hydraulic motors has difficulty in processing, leakage problems and unstable tilt forces, which lead to increased wear, reduced volumetric efficiency and mechanical efficiency, and affect low-speed operation stability.
The crankshaft swing cylinder type structure is adopted, and the piston, swing cylinder, rolling bearing, oil distribution plate and oil-through plate design is designed. The piston is driven to reciprocate in the swing cylinder through high-pressure oil, which promotes the crankshaft rotation, and transmits torque through the rolling bearing to reduce friction loss.
It realizes a hydraulic motor design without leakage and low friction loss, extends service life, improves volume efficiency and low-speed operation stability, and enhances the practicality of the hydraulic motor.
Smart Images
Figure CN120466136A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of hydraulic equipment, and in particular to a crankshaft swing cylinder type hydraulic motor. Background Art
[0002] A hydraulic motor is an actuator in a hydraulic system. It converts the fluid pressure energy provided by a hydraulic pump into mechanical energy on the output shaft, thereby providing torque and speed to drive the load in rotation. Hydraulic motors are capable of providing high torque and are widely used in construction machinery. The operating principle of a hydraulic motor is the opposite of that of a hydraulic pump. While a hydraulic pump converts the mechanical energy of the motor into the pressure energy of the fluid, a hydraulic motor converts the pressure energy of the fluid into mechanical energy.
[0003] Existing hydraulic motors usually include a housing, a cylinder head and a cover sealed with the housing, a crankshaft, an oil pan, an oil distribution plate, and a plunger body. The housing has multiple plunger cylinders, an odd number of which are radially and evenly distributed on the circumference of the housing. The plunger body in the plunger cylinder is spherically hinged to the ball head on the upper part of the connecting rod. The cylindrical surface at the bottom of the connecting rod contacts the eccentric sleeve in the crankshaft. The connecting rod has an axially penetrating oil channel at the axial center position. The straight shaft in the crankshaft is supported in the housing and the cover by bearings. One end of the straight shaft in the crankshaft is connected to the oil distribution plate by a double-headed key, and the other end of the straight shaft is used to drive the load to rotate.
[0004] During use, when the pressure oil enters the inner cavity of the shell above the plunger body from the oil pan through the oil distribution plate and the flow channel in the shell, the liquid pressure generated by the pressure oil acts on the top of the plunger body. The liquid pressure is decomposed into a force pointing to the center of the crankshaft along the center line of the connecting rod and a lateral force generated on the inner wall of the plunger cylinder. The tangential force of the former generates torque on the rotation center of the crankshaft, causing the crankshaft to rotate around its rotation center, thereby converting hydraulic energy into mechanical energy and achieving the purpose of output speed and torque.
[0005] The above-mentioned hydraulic motor mainly adopts a plunger-connecting rod assembly structure. On the one hand, the interface between the connecting rod and the crankshaft is relatively large, which brings significant difficulties to processing and manufacturing. In actual operation, this interface is also prone to leakage problems. Once leakage occurs, the force between the friction pairs will increase significantly, causing excessive wear and shortening the service life of the hydraulic motor. On the other hand, when the connecting rod swings, an unstable tilting force will be generated between the plunger cylinder and the plunger. This unstable force can easily cause component wear, which not only reduces volumetric efficiency and mechanical efficiency, but also has an adverse effect on the stability of the hydraulic motor when running at low speeds. Therefore, it needs to be improved. Summary of the Invention
[0006] In order to reduce friction loss during force transmission and extend the service life of the hydraulic motor, the present application provides a crankshaft swing cylinder hydraulic motor.
[0007] The present application provides a crankshaft swing cylinder type hydraulic motor adopts the following technical solution: A crankshaft swing cylinder hydraulic motor comprises a housing, an end cover, a piston, a swing cylinder, a rolling bearing, an oil distribution plate, a crankshaft, and an oil pan. The end cover is detachably connected to the housing, and a cavity is formed therebetween. The swing cylinder is connected to the housing and is located within the cavity. The piston is disposed within the swing cylinder and forms a sealed working chamber with the inner wall of the swing cylinder. The crankshaft is disposed between the housing and the end cover, with one end penetrating the housing; the piston is connected to the crankshaft via the rolling bearing, which is sleeved on the crankshaft, and the piston is used to transmit torque to the crankshaft; wherein a plurality of oscillating cylinders are distributed at equal intervals along the circumference of the crankshaft, and each oscillating cylinder is equipped with a piston; The oil-passing pan is arranged on the end cover, and the oil distribution pan is arranged in the oil-passing pan and is connected to the crankshaft; the oil inlet of the oil-passing pan is connected to the external oil supply pipeline and is used to guide the high-pressure oil to the oil distribution pan, and the oil distribution pan is used to distribute the high-pressure oil to the working chamber of each of the swing cylinders.
[0008] By adopting the above technical solution, in the hydraulic motor, the oil inlet of the oil pan is connected to an external oil supply line, introducing high-pressure oil into the system and ensuring that the high-pressure oil flows accurately to the oil distribution plate, providing the power source for the hydraulic motor. The oil distribution plate distributes the high-pressure oil from the oil pan into the chamber of the swing cylinder, thereby generating thrust on the piston, driving the piston to reciprocate within the swing cylinder. This thrust acts directly on the center of the crankshaft. Because the thrust generated by each piston varies in magnitude and direction, the combined force causes the crankshaft to rotate, driving the oil distribution plate with it.
[0009] When the piston reaches bottom dead center, the oil distribution plate opens to the oil return port, pushing the piston upward. The hydraulic oil, having performed work, then returns to the oil distribution plate through the distribution plate. Each piston is then sequentially connected to high- and low-pressure hydraulic oil. The driving torques generated by each piston on the crankshaft center are summed in the same direction, resulting in continuous, stable rotational torque for the motor output shaft. Changing the direction of oil flow changes the direction of motor rotation. Rotating the distribution plate 180° also allows for reverse rotation of the hydraulic motor, improving practicality.
[0010] A leak-proof plastic seal between the piston and the tilting cylinder ensures high volumetric efficiency. Since there is no lateral force between the piston and the tilting cylinder, the piston base is designed for static pressure balance, and torque is transmitted between the piston and the crankshaft via rolling bearings. These factors reduce friction losses during power transmission and extend the life of the hydraulic motor.
[0011] Preferably, the shell and the end cover are locked by a fastener, and the fastener is a fastening bolt or a fastening screw.
[0012] By adopting the above technical solution, the fastening bolts or fastening screws are detachable objects, and the detachable connection between the shell and the end cover is achieved by screw connection.
[0013] Preferably, an O-ring is further included, and an O-groove is provided on one side of the end cover facing the shell, and the O-ring is arranged in the O-groove.
[0014] By adopting the above technical solution, the O-ring is installed in the O-groove and fills the tiny gap between the connecting surfaces through its own elastic deformation, thereby improving the sealing between the end cover and the housing and preventing the fluid from leaking from the sealing part in a static state.
[0015] Preferably, it further comprises a snap ring, which is arranged at one end of the piston away from the swing cylinder, and an annular groove is provided on the outer peripheral side of the rolling bearing, and the snap ring is embedded in the annular groove.
[0016] By adopting the above technical solution, since the piston and the rolling bearing are firmly fixed to each other by the retaining ring without any gap, the hydraulic motor can operate under pump conditions. When the oil inlet of the oil pan is closed, the motor can operate at high speed under free wheel conditions.
[0017] Preferably, it further comprises a limiting ring and a barrier strip, and the outer diameter of the rolling bearing gradually increases from one end to a maximum value and then gradually decreases; both ends of the rolling bearing are connected to the limiting ring, and the two limiting rings and the outer surface of the rolling bearing form the annular groove; A groove is provided on the rolling bearing, and the baffle bar is embedded in the groove. The baffle bar is used to limit the limit ring from falling off the rolling bearing; there is a gap at both ends of the baffle bar, and the baffle bar has elastic deformation ability. Through holes are provided at both ends of the baffle bar, and the two ends of the baffle bar are connected by a U-shaped block.
[0018] By adopting the above technical solution, when the snap ring needs to be connected, the snap ring is first placed in contact with the outer wall of the rolling bearing. A retaining ring is then clamped onto one end of the rolling bearing, securing the retaining ring. A barrier strip is then embedded in the groove, and U-shaped blocks are inserted into the through-holes at both ends of the barrier strip to prevent the gap between the two ends from widening. The barrier strip prevents the retaining ring from falling off the rolling bearing, thereby improving the stability of the snap ring connection.
[0019] Preferably, it further comprises a double-headed key and a positioning ring, wherein the positioning ring is arranged at the center of the oil distribution plate, and both ends of the double-headed key are connected to the crankshaft and the positioning ring respectively.
[0020] By adopting this technical solution, the double-ended key connects the crankshaft and the oil distribution plate, transmitting the crankshaft's torque to the oil distribution plate. When the crankshaft rotates, the double-ended key engages the crankshaft's keyway. Through the mutual compression between the key and the side of the keyway, the crankshaft's rotational motion and torque are transmitted to the oil distribution plate, causing the oil distribution plate to rotate with the shaft, thus achieving power transmission.
[0021] Preferably, it further comprises cylindrical roller bearings, which are arranged on the crankshaft, and the cylindrical roller bearings are arranged on both sides of the rolling bearing.
[0022] By adopting the above technical solution, the main function of the cylindrical roller bearing is to withstand large radial loads. When the crankshaft is running, a large radial force will be generated. The cylindrical roller bearing can effectively support the crankshaft, limit the radial runout and swing of the shaft, and enable the shaft to maintain an accurate position during rotation, ensuring smooth operation.
[0023] Preferably, the oil pan is detachably connected to the end cover by fastening bolts.
[0024] By adopting the above technical solution, the fastening bolts realize the detachable connection between the oil pan and the end cover, making it convenient for staff to inspect and repair the oil pan.
[0025] Preferably, it further comprises an oil distribution gasket, which is arranged on a side of the oil distribution plate facing the oil pan.
[0026] By adopting the above technical solution, the oil distribution gasket can play a sealing role and prevent the hydraulic oil from leaking from the contact surface.
[0027] In summary, this application includes at least one of the following beneficial technical effects: (1) By arranging the piston, the rocking cylinder, the rolling bearing, the oil distribution plate, the crankshaft, and the oil plate, the hydraulic oil enters the rocking cylinder cavity through the oil distribution plate, generating a thrust on the piston. This thrust acts directly on the center of the crankshaft. Since the thrust generated by each piston is different in magnitude and direction, the crankshaft rotates under the action of the combined force and drives the oil distribution plate to rotate together. Since there is no lateral force between the piston and the rocking cylinder, the bottom of the piston is designed to be statically balanced, and the torque is transmitted between the piston and the crankshaft through the rolling bearing. These factors reduce friction losses during the power transmission process.
[0028] (2) By setting a limit ring and a spacer bar, the limit ring and the spacer bar cooperate with each other to facilitate the installation of the retaining ring on the rolling bearing.
[0029] (3) By setting a double-headed key and a locating ring, the double-headed key connects the crankshaft and the oil distribution plate, thereby transmitting the torque of the crankshaft to the oil distribution plate. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Figure 1This is a schematic diagram of the structure of the hydraulic motor in the embodiment of the present application; Figure 2 is a cross-sectional view of a hydraulic motor in an embodiment of the present application; Figure 3 Schematic diagram of the explosion of the housing and the end cover in the embodiment of the present application; Figure 4 This is a partial structural diagram of a hydraulic motor in an embodiment of the present application; Figure 5 This is a schematic structural diagram of a crankshaft and an oil pan in an embodiment of the present application; Figure 6 Schematic diagram of an explosion of a crankshaft and an oil pan in an embodiment of the present application; Figure 7 yes Figure 6 Structural diagram from another perspective; Figure 8 It is an exploded schematic diagram of the limit ring and the rolling bearing in the embodiment of the present application.
[0031] Figure numerals: 1. Housing; 2. End cover; 3. Piston; 4. Swing cylinder; 5. Rolling bearing; 6. Oil distribution plate; 7. Crankshaft; 8. Oil pan; 9. O-groove; 10. O-ring; 11. Double-headed key; 12. Locating ring; 13. Oil distribution gasket; 14. Snap ring; 15. Ring groove; 16. Limit ring; 17. Groove; 18. Spacer strip; 19. U-shaped block; 20. Cylindrical roller bearing. DETAILED DESCRIPTION
[0032] The following will describe the technical solution of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. The present application can be embodied in many different forms and is not limited to the embodiments described here.
[0033] Throughout the present application, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.
[0035] In the description of the embodiments of this application, unless otherwise specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, integration, or mechanical connections. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this application based on specific circumstances.
[0036] Some embodiments of the present application are described in detail below with reference to the accompanying drawings. In the absence of conflict, those skilled in the art may combine and combine the different embodiments or examples and features of the different embodiments or examples shown in the present application.
[0037] The embodiment of the present application discloses a crankshaft swing cylinder type hydraulic motor. Figures 1 to 3 The hydraulic motor includes a housing 1, an end cover 2, a piston 3, a swing cylinder 4, a rolling bearing 5, an oil distribution plate 6, a crankshaft 7 and an oil pan 8. The end cover 2 is detachably connected to the housing 1, and a cavity is formed between the two. In this embodiment, the housing 1 and the end cover 2 are locked by fasteners, and the fasteners are fastening bolts or fastening screws. Among them, an O-shaped groove 9 is provided on the side of the end cover 2 facing the housing 1, and an O-ring 10 is also embedded in the O-shaped groove 9. The O-ring 10 fills the tiny gap between the connecting surfaces through its own elastic deformation, thereby improving the sealing between the end cover 2 and the housing 1 and preventing the fluid from leaking from the sealing part in a static state.
[0038] Combine Figure 4 The swing cylinder 4 is connected to the housing 1 and is located in the cavity. The piston 3 is installed inside the swing cylinder 4 and forms a sealed working chamber with the inner wall of the swing cylinder 4. The crankshaft 7 is installed between the housing 1 and the end cover 2, and one end passes through the housing 1. The piston 3 is connected to the crankshaft 7 through a rolling bearing 5. The rolling bearing 5 is sleeved on the crankshaft 7. The piston 3 is used to transmit torque to the crankshaft 7. Among them, there are several swing cylinders 4 distributed at equal intervals along the circumference of the crankshaft 7. As shown in the figure, there are five swing cylinders 4, and each swing cylinder 4 is equipped with a piston 3.
[0039] The oil pan 8 is detachably connected to the end cover 2. In this embodiment, the oil pan 8 is also secured to the end cover 2 by fastening bolts. The oil distribution plate 6 is mounted within the oil pan 8 and connected to the crankshaft 7. The oil inlet of the oil pan 8 is connected to an external oil supply line and is used to guide high-pressure oil to the oil distribution plate 6. The oil distribution plate 6 distributes the high-pressure oil to the working chamber of each swing cylinder 4.
[0040] In the hydraulic motor system, the oil inlet of the oil pan 8 is connected to the external oil supply line, which is responsible for introducing high-pressure oil into the entire system and ensuring that the high-pressure oil can accurately flow to the oil distribution plate 6, providing a power source for the normal operation of the hydraulic motor. The oil distribution plate 6 bears the important responsibility of distributing the high-pressure oil from the oil pan 8 to the cavity of the swing cylinder 4. The high-pressure oil acts on the piston 3 in the cavity of the swing cylinder 4, thereby generating thrust on the piston 3, pushing the piston 3 to reciprocate in the swing cylinder 4. This thrust is directly applied to the center of the crankshaft 7. Since the thrust generated by each piston 3 varies in size and direction, the crankshaft 7 is rotated under the action of the combined force, and at the same time drives the oil distribution plate 6 to rotate together. When piston 3 reaches bottom dead center, oil distribution plate 6 connects to the oil return port. Crankshaft 7 pushes piston 3 upward, and the hydraulic oil after work flows back through oil distribution plate 6 to oil pan 8. Each piston 3 is sequentially connected to high- and low-pressure hydraulic oil. The driving torque generated by each piston 3 on the center of crankshaft 7 remains consistent in direction and superimposed, allowing the motor output shaft to obtain continuous and stable rotational torque. Changing the direction of oil flow also changes the direction of rotation of the hydraulic motor. Rotating oil distribution plate 6 180° for assembly also allows the hydraulic motor to reverse, effectively improving its practicality. Plastic sealing technology is used between the piston 3 and the swing cylinder 4 to ensure zero leakage, resulting in extremely high volumetric efficiency. Since there is no lateral force between the piston 3 and the swing cylinder 4, the bottom of the piston 3 is designed as a statically balanced structure, and torque is transmitted between the piston 3 and the crankshaft 7 via rolling bearings 5. These features significantly reduce friction losses during power transmission, helping to extend the service life of the hydraulic motor.
[0041] Reference Figures 5 to 7 Specifically, a double-headed key 11 and a positioning ring 12 are installed inside the shell 1. The positioning ring 12 is hollow and fixedly connected to the center of the oil distribution plate 6. The double-headed key 11 is set horizontally, and its two ends are respectively connected to the crankshaft 7 and the positioning ring 12. The double-headed key 11 connects the crankshaft 7 and the oil distribution plate 6, and can transmit the torque of the crankshaft 7 to the oil distribution plate 6. When the crankshaft 7 rotates, the double-headed key 11 is embedded in the keyway of the crankshaft 7, and the rotational motion and torque of the crankshaft 7 are transmitted to the oil distribution plate 6 through the mutual compression between the key and the side of the keyway, so that the oil distribution plate 6 rotates with the shaft, thereby realizing power transmission. Among them, an oil distribution gasket 13 is also installed on the side of the oil distribution plate 6 facing the oil pan 8. The oil distribution gasket 13 can play a sealing role to prevent hydraulic oil from leaking from the contact surface.
[0042] Combine Figure 8In this embodiment, a retaining ring 14 is fixedly connected to the end of the piston 3 away from the swing cylinder 4. An annular groove 15 is provided on the outer circumference of the rolling bearing 5, and the retaining ring 14 is embedded in the annular groove 15. As shown in the figure, the outer diameter of the rolling bearing 5 gradually increases from one end to a maximum value and then gradually decreases; the outer diameter of the rolling bearing 5 is largest in the middle, and the outer diameters of the rolling bearing 5 are equal at both ends. Limiting rings 16 are connected to both ends of the rolling bearing 5. The outer diameter of the limiting rings 16 is larger than the outer diameter of the ends of the rolling bearing 5. The two limiting rings 16 form an annular groove 15 with the outer surface of the rolling bearing 5.
[0043] The end of the rolling bearing 5 is also provided with a groove 17, into which a barrier strip 18 is embedded. This barrier strip 18 is used to prevent the retaining ring 16 from falling off the rolling bearing 5. The barrier strip 18 is annular, with gaps at both ends. It is elastically deformable and can be made of metal, which has excellent ductility and plasticity. Through holes are formed at both ends of the barrier strip 18, which is connected by a U-shaped block 19, which is inserted into the barrier strip 18 at both ends.
[0044] When connecting the snap ring 14 to the rolling bearing 5, first place the snap ring 14 in contact with the outer wall of the rolling bearing 5. Next, the retaining ring 16 is clamped onto one end of the rolling bearing 5, securing the retaining ring 16 to the snap ring 14. Next, the barrier strip 18 is inserted into the groove 17, and U-shaped blocks 19 are inserted into the through-holes at both ends of the barrier strip 18 to prevent the gap between the two ends from widening. The barrier strip 18 prevents the retaining ring 16 from falling off the rolling bearing 5, thereby improving the stability of the connection of the snap ring 14.
[0045] Since the piston 3 and the rolling bearing 5 are firmly attached to each other by the retaining ring 14 without any gap, the hydraulic motor can operate in a pumping state. When the oil inlet of the oil pan 8 is closed, the motor can operate at high speed in a freewheeling state.
[0046] Furthermore, cylindrical roller bearings 20 are mounted on the rolling bearing 5 and are located on both sides of the rolling bearing 5. Cylindrical roller bearings 20 are capable of withstanding large radial loads. When the crankshaft 7 is in operation, generating large radial forces, the cylindrical roller bearings 20 effectively support the crankshaft 7, limiting radial runout and oscillation, allowing the shaft to maintain accurate position during rotation and ensuring smooth operation.
[0047] The implementation principle of a crankshaft swing cylinder hydraulic motor in an embodiment of the present application is as follows: In the hydraulic motor, the oil inlet of the oil pan 8 is connected to the external oil supply pipeline, which introduces high-pressure oil into the system and enables the high-pressure oil to flow accurately to the oil distribution plate 6, providing a power source for the operation of the hydraulic motor. The oil distribution plate 6 distributes the high-pressure oil from the oil pan 8 into the cavity of the swing cylinder 4, thereby generating a thrust on the piston 3, which drives the piston 3 to reciprocate in the swing cylinder 4. This thrust acts directly on the center of the crankshaft 7. Since the thrust generated by each piston 3 is different in magnitude and direction, the crankshaft 7 rotates under the action of the combined force and drives the oil distribution plate 6 to rotate together.
[0048] When piston 3 reaches bottom dead center, the oil distribution plate 6 opens to the oil return port, pushing piston 3 upward by crankshaft 7. The hydraulic oil, having performed work, then returns to oil pan 8 through oil distribution plate 6. Each piston 3 is then sequentially connected to high- and low-pressure hydraulic oil. The driving torques generated by each piston 3 on the center of crankshaft 7 are summed in the same direction, providing the motor output shaft with continuous, stable rotational torque. Changing the direction of oil flow can also alter the direction of motor rotation. Rotating oil distribution plate 6 180° can also reverse the rotation of the hydraulic motor, improving practicality.
[0049] A plastic seal between piston 3 and tilt cylinder 4 creates a leak-free seal, resulting in high volumetric efficiency. Since there is no lateral force between piston 3 and tilt cylinder 4, the bottom of piston 3 is designed for static pressure balance. Torque is transmitted between piston 3 and crankshaft 7 via rolling bearing 5. These features reduce friction losses during power transmission, extending the life of the hydraulic motor.
[0050] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. A crankshaft swing cylinder hydraulic motor, characterized in that: The invention comprises a housing (1), an end cover (2), a piston (3), a swing cylinder (4), a rolling bearing (5), an oil distribution plate (6), a crankshaft (7) and an oil through plate (8), wherein the end cover (2) is detachably connected to the housing (1), and a cavity is formed between the two; the swing cylinder (4) is connected to the housing (1) and is located in the cavity; the piston (3) is arranged inside the swing cylinder (4), and forms a sealed working chamber with the inner wall of the swing cylinder (4); The crankshaft (7) is arranged between the housing (1) and the end cover (2), and one end thereof passes through the housing (1); the piston (3) is connected to the crankshaft (7) via the rolling bearing (5), the rolling bearing (5) is sleeved on the crankshaft (7), and the piston (3) is used to transmit torque to the crankshaft (7); wherein a plurality of the swing cylinders (4) are distributed at equal intervals along the circumferential direction of the crankshaft (7), and each of the swing cylinders (4) is equipped with a piston (3); The oil-passing pan (8) is provided on the end cover (2), and the oil distribution pan (6) is provided in the oil-passing pan (8) and is connected to the crankshaft (7); the oil inlet of the oil-passing pan (8) is connected to an external oil supply pipeline and is used to guide high-pressure oil to the oil distribution pan (6), and the oil distribution pan (6) is used to distribute the high-pressure oil to the working chamber of each of the swing cylinders (4).
2. The crankshaft swing cylinder type hydraulic motor according to claim 1, characterized in that: The housing (1) and the end cover (2) are locked together by a fastener, and the fastener is a fastening bolt or a fastening screw.
3. The crankshaft swing cylinder type hydraulic motor according to claim 2, characterized in that: It also includes an O-ring (10), and an O-groove (9) is provided on one side of the end cover (2) facing the housing (1), and the O-ring (10) is arranged in the O-groove (9).
4. The crankshaft swing cylinder type hydraulic motor according to claim 1, characterized in that: It also includes a snap ring (14), which is arranged at one end of the piston (3) away from the swing cylinder (4), and an annular groove (15) is provided on the outer peripheral side of the rolling bearing (5), and the snap ring (14) is embedded in the annular groove (15).
5. The crankshaft swing cylinder type hydraulic motor according to claim 4, characterized in that: It also includes a limiting ring (16) and a barrier strip (18), and the outer diameter of the rolling bearing (5) gradually increases from one end to a maximum value and then gradually decreases; both ends of the rolling bearing (5) are connected to the limiting ring (16), and the two limiting rings (16) and the outer surface of the rolling bearing (5) form the annular groove (15); The rolling bearing (5) is provided with a groove (17), and the baffle bar (18) is embedded in the groove (17). The baffle bar (18) is used to limit the limiting ring (16) from falling off from the rolling bearing (5); a gap is left at both ends of the baffle bar (18), and the baffle bar (18) has elastic deformation capability. Through holes are provided at both ends of the baffle bar (18), and the two ends of the baffle bar (18) are connected by a U-shaped block (19).
6. The crankshaft swing cylinder type hydraulic motor according to claim 1, characterized in that: It also includes a double-headed key (11) and a positioning ring (12), wherein the positioning ring (12) is arranged at the center of the oil distribution plate (6), and the two ends of the double-headed key (11) are respectively connected to the crankshaft (7) and the positioning ring (12).
7. The crankshaft swing cylinder type hydraulic motor according to claim 1, characterized in that: It also includes a cylindrical roller bearing (20), which is provided on the crankshaft (7), and the cylindrical roller bearing (20) is provided on both sides of the rolling bearing (5).
8. The crankshaft swing cylinder type hydraulic motor according to claim 1, characterized in that: The oil pan (8) is detachably connected to the end cover (2) via fastening bolts.
9. The crankshaft swing cylinder type hydraulic motor according to claim 1, characterized in that: It also includes an oil distribution gasket (13), which is arranged on a side of the oil distribution plate (6) facing the oil passage plate (8).