Hydraulic motor

Abstract

The utility model relates to a hydraulic motor. The hydraulic motor comprises a shell; the crankshaft is rotationally arranged on the shell, and the crankshaft comprises an eccentric shaft part extending into the shell; the multiple tilt cylinders are arranged on the periphery of the eccentric shaft part in the circumferential direction, and a plunger is arranged in each tilt cylinder; the end, facing the eccentric shaft part, of each plunger is provided with an arc-shaped joint part matched with the peripheral wall of the eccentric shaft part, the side wall of the side, facing the eccentric shaft part, of each arc-shaped joint part is provided with an arc-shaped wear-resisting piece, and the arc-shaped wear-resisting pieces make contact with the peripheral wall of the eccentric shaft part. The utility model has the advantages of effectively improving the working stability of the hydraulic motor, simplifying the assembly structure and reducing the production cost.

Description

Technical Field

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

[0002] The core component of a hydraulic motor is the output shaft. The state of the output shaft plays a crucial role in the operation of the motor. When the hydraulic motor is working, it distributes high-pressure oil to the piston. The piston extends and pushes the output shaft to rotate. The rotation of the output shaft drives the crankshaft to rotate, which in turn drives the distributor plate to rotate, redistributing high-pressure oil to the next piston, thus realizing the continuous rotation of the output shaft.

[0003] In the conventional structure of a hydraulic motor, the crankshaft is typically fitted with a bearing sleeve and cylindrical rollers. The cylindrical rollers are equidistantly arranged circumferentially within the inner circumference of the bearing sleeve, and the transmission engagement is achieved through the rollers and bearing sleeve with the plunger assembly of the swing cylinder arranged on the periphery. For example, the crankshaft engagement structure of such a hydraulic motor is shown in Chinese utility model patent application No. CN201220727742.0 (authorization announcement No.: CN203009556U).

[0004] While existing hydraulic motors employ a cylindrical roller structure between the bearing sleeve and crankshaft to convert sliding friction into rolling friction, thereby reducing frictional heat and improving mechanical efficiency, the roller structure itself is subject to wear. After prolonged operation, the clearance between the rollers and raceways may increase. During motor rotation, this can easily lead to bearing damage or detachment due to stress, affecting the stability of the hydraulic motor. Furthermore, installing rollers and bearing sleeves outside the crankshaft complicates the assembly process of the hydraulic motor and increases production costs. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a hydraulic motor that can effectively improve the working stability of the hydraulic motor and simplify the assembly structure, based on the current state of the technology.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a hydraulic motor, comprising:

[0007] case;

[0008] A crankshaft, rotatably mounted on the housing, the crankshaft including an eccentric shaft portion extending into the housing;

[0009] Multiple swing cylinders are arranged circumferentially around the periphery of the eccentric shaft, and each swing cylinder has a plunger inside;

[0010] Each plunger has an arc-shaped joint portion at one end facing the eccentric shaft portion that is adapted to the outer peripheral wall of the eccentric shaft portion. An arc-shaped wear-resistant plate is provided on one side wall of the arc-shaped joint portion facing the eccentric shaft portion, and the arc-shaped wear-resistant plate is in contact with the outer peripheral wall of the eccentric shaft portion.

[0011] To facilitate the assembly and subsequent replacement of the arc-shaped wear-resistant plate, the arc-shaped wear-resistant plate is detachably connected to the side wall of the arc-shaped joint.

[0012] To limit the arc-shaped wear-resistant plate and prevent it from falling off relative to the arc-shaped joint, and to further ensure that the eccentric shaft only contacts the arc-shaped wear-resistant plate placed in the limiting groove in the circumferential direction, the side wall of the arc-shaped joint facing the eccentric shaft has a limiting groove for accommodating the arc-shaped wear-resistant plate. The arc-shaped joint has opposing first and second sides along the circumferential direction of the eccentric shaft, and the limiting groove passes through the first and second sides along the circumferential direction of the eccentric shaft.

[0013] In order to limit the arc-shaped wear-resistant sheet in the circumferential direction, the arc-shaped joint has a third side and a fourth side opposite to each other along the axial direction of the eccentric shaft. The third side and the fourth side are respectively provided with a first limiting groove and a second limiting groove. The arc-shaped wear-resistant sheet has a first limiting protrusion on the side corresponding to the third side that can be correspondingly engaged in the first limiting groove, and the arc-shaped wear-resistant sheet has a second limiting protrusion on the side corresponding to the fourth side that can be correspondingly engaged in the second limiting groove.

[0014] In order to ensure that the first and second limiting protrusions can be engaged in the corresponding limiting slots as much as possible, thereby ensuring the reliability of restricting the movement of the arc-shaped wear-resistant sheet in the circumferential direction, the first and second limiting protrusions of the arc-shaped wear-resistant sheet are inclined to the side opposite to the direction of the notch of the arc-shaped wear-resistant sheet.

[0015] As an improvement, a lubricating oil groove is provided on the bottom wall of the limiting groove of the arc-shaped joint, extending circumferentially along the eccentric shaft. Two or more of these lubricating oil grooves can be provided axially along the eccentric shaft.

[0016] As an improvement, the housing is further provided with a first limiting ring and a second limiting ring arranged axially at intervals along the eccentric shaft portion. The third side of the arc-shaped joint portion of each plunger is limited to the radial inner side of the first limiting ring, and the fourth side of the arc-shaped joint portion of each plunger is limited to the radial inner side of the second limiting ring.

[0017] As an improvement, both the first and second limiting rings include an axial extension portion and a radial extension portion extending radially inward from one side of the axial extension portion. The third side of the arcuate engagement portion of each plunger abuts against the radial extension portion of the first limiting ring and is limited to the radially inner side of the axial extension portion of the first limiting ring. The fourth side of the arcuate engagement portion of each plunger abuts against the radial extension portion of the second limiting ring and is limited to the radially inner side of the axial extension portion of the second limiting ring.

[0018] Compared with existing technologies, the advantages of this utility model are as follows: This utility model eliminates the rollers and bearing sleeves of existing hydraulic motors, adopting a transmission method where the crankshaft and plunger directly engage in an arc-shaped joint. An arc-shaped wear-resistant plate is provided on the side wall of the eccentric shaft portion of the arc-shaped joint facing the crankshaft, allowing direct contact between the wear-resistant plate and the outer peripheral wall of the eccentric shaft portion, thus extending the crankshaft's service life. By eliminating rollers and bearing sleeves from the hydraulic motor, the overall structure is simplified, reducing assembly complexity, minimizing the possibility of assembly errors, and improving assembly efficiency and accuracy. Furthermore, the number of potential failure points is reduced, improving the reliability and durability of the hydraulic motor. The direct engagement of the crankshaft and plunger's arc-shaped joint also optimizes the dynamic performance of the hydraulic motor, resulting in faster response and higher stability. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the hydraulic motor according to an embodiment of the present utility model;

[0020] Figure 2 This is a cross-sectional view of the hydraulic motor according to an embodiment of the present utility model;

[0021] Figure 3 This is a left view of the hydraulic motor according to an embodiment of the present invention;

[0022] Figure 4 for Figure 3 Sectional view at point AA;

[0023] Figure 5 This is a front view of the hydraulic motor according to an embodiment of the present utility model;

[0024] Figure 6 for Figure 5 Sectional view at point BB;

[0025] Figure 7 This is a three-dimensional structural diagram of the swing cylinder, plunger, and arc-shaped wear-resistant plate assembled together according to an embodiment of the present utility model.

[0026] Figure 8 for Figure 7 A schematic diagram of the three-dimensional structure of the arc-shaped wear-resistant pad in a separated state. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0028] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0029] Figures 1-8 A preferred embodiment of the hydraulic motor of this utility model is shown. The hydraulic motor includes a housing 10, a crankshaft 2, a plurality of swing cylinders 3 disposed within the housing 10, and plungers 30 cooperating with corresponding swing cylinders 3. The housing 10 includes a shell body with an open end and an end cap covering the open end of the shell body. The crankshaft 2 is rotatably mounted on the housing 10 and has an eccentric shaft portion 21 extending into the housing 10. The plurality of swing cylinders 3 are arranged circumferentially on the outside of the eccentric shaft portion 21 of the crankshaft, and each plunger 30 is correspondingly disposed in each swing cylinder 3, forming a sealed working chamber. The plunger 30 reciprocates within the swing cylinder 3, converting hydraulic energy into mechanical energy. The hydraulic motor also includes corresponding distribution components, such as a distribution plate, control valve assembly, etc., wherein the installation structure and working process of the distribution components are prior art and will not be described in detail here.

[0030] See Figure 2 and Figure 6 Both ends of the crankshaft 2 are rotatably connected to the inner wall of the housing 10 via bearings 6. The inner walls of the housing 10 are provided with mounting grooves for accommodating the bearings 6.

[0031] Each plunger 30 corresponding to each swing cylinder 3 has an arc-shaped joint 31 at one end facing the eccentric shaft portion 21, which is adapted to the outer peripheral wall of the eccentric shaft portion 21. The arc-shaped joint 31 can be integrally formed with the plunger 30, or it can be fixedly installed as a separate part to the end of the plunger 30. The arc or radius of curvature of the side wall of the arc-shaped joint 31 facing the eccentric shaft portion 21 is adapted to the arc or radius of curvature of the eccentric shaft portion 21 of the crankshaft 2. An arc-shaped wear-resistant plate 4 is provided on the side wall of the arc-shaped joint 31 facing the eccentric shaft portion 21. In a preferred embodiment, the arc-shaped wear-resistant plate 4 is detachably connected to the side wall of the arc-shaped joint 31, which facilitates the assembly and subsequent replacement of the arc-shaped wear-resistant plate 4. After the arc-shaped wear-resistant plate 4 is installed in place, the side wall of the arc-shaped wear-resistant plate 4 facing away from the notch fits against the side wall of the arc-shaped joint 31 facing the eccentric shaft portion 21, while the side wall of the arc-shaped wear-resistant plate 4 with the notch directly contacts the outer peripheral wall of the eccentric shaft portion 21. This embodiment eliminates the rollers and bearing sleeves of the hydraulic motor in the prior art, and adopts a transmission method in which the crankshaft 2 and the arc-shaped joint 31 of the plunger 30 directly cooperate. The arc-shaped wear-resistant plate 4 is provided on the side wall of the arc-shaped joint 31 facing the eccentric shaft portion 21 of the crankshaft 2, so that the arc-shaped wear-resistant plate 4 directly contacts the outer peripheral wall of the eccentric shaft portion 21, thus extending the service life of the crankshaft 2. Since the rollers and bearing sleeves and other parts in the hydraulic motor are eliminated, the overall structure is simplified, the complexity of the assembly process is reduced, the possibility of assembly errors is reduced, and the assembly efficiency and accuracy are improved. On the other hand, the number of failure points is also reduced, improving the reliability and durability of the hydraulic motor. The direct engagement of the crankshaft 2 and the plunger 30 with the arc-shaped joint 31 optimizes the dynamic performance of the hydraulic motor, resulting in faster response and higher stability.

[0032] The arc-shaped joint 31 has opposing first side portions 311 and second side portions 312 along the circumferential direction of the eccentric shaft portion 21, and opposing third side portions 313 and fourth side portions 314 along the axial direction of the eccentric shaft portion 21. The side wall of the arc-shaped joint 31 facing the eccentric shaft portion 21 has a limiting groove for accommodating the arc-shaped wear-resistant plate 4. The limiting groove extends through the first side portion 311 and the second side portion 312 along the circumferential direction of the eccentric shaft portion 21; that is, the limiting groove is an arc-shaped groove with two open ends in its length direction. The limiting groove can limit the arc-shaped wear-resistant plate 4, preventing it from loosening. Furthermore, the open ends in the length direction of the limiting groove allow the eccentric shaft portion 21 to contact the arc-shaped wear-resistant plate 4 placed in the limiting groove only in the circumferential direction.

[0033] The third side portion 313 and the fourth side portion 314 are respectively provided with a first limiting groove 3130 and a second limiting groove 3140. The arc-shaped wear-resistant plate 4 has a first limiting protrusion 41 on the side corresponding to the third side portion 313, which can be correspondingly engaged in the first limiting groove 3130. The arc-shaped wear-resistant plate 4 has a second limiting protrusion 42 on the side corresponding to the fourth side portion 314, which can be correspondingly engaged in the second limiting groove 3140. The first limiting protrusion 41 and the second limiting protrusion 42 of the arc-shaped wear-resistant plate 4 both extend inclinedly away from the side facing the concave opening of the arc-shaped wear-resistant plate 4. Therefore, the first limiting protrusion 41 and the second limiting protrusion 42 can be engaged in the corresponding limiting grooves as much as possible, thereby ensuring the reliability of restricting the circumferential movement of the arc-shaped wear-resistant plate 4.

[0034] A lubricating oil groove 310 is provided on the bottom wall of the limiting groove of the arc-shaped joint 31, extending circumferentially along the eccentric shaft portion 21. The lubricating oil groove 310 extends circumferentially to the edges of the first side portion 311 and the second side portion 312 of the arc-shaped joint 31. Two or more lubricating oil grooves 310 can be provided axially along the eccentric shaft portion 21, such as... Figure 8 Two lubricating oil grooves 310 are shown.

[0035] See Figure 2 and Figure 6 The housing 10 also includes a first limiting ring 50a and a second limiting ring 50b arranged axially spaced along the eccentric shaft portion 21. Both the first limiting ring 50a and the second limiting ring 50b include an axially extending portion 51 and a radially extending portion 52 extending radially inward from one side of the axially extending portion 51. The third side portion 313 of the arcuate engagement portion 31 of each plunger 30 abuts against the radially extending portion 52 of the first limiting ring 50a and is limited to the radially inner side of the axially extending portion 51 of the first limiting ring 50a. Similarly, the fourth side portion 314 of the arcuate engagement portion 31 of each plunger 30 abuts against the radially extending portion 52 of the second limiting ring 50b and is limited to the radially inner side of the axially extending portion 51 of the second limiting ring 50b.

Claims

1. A hydraulic motor, comprising: Shell (10); A crankshaft (2) is rotatably mounted on the housing (10), and the crankshaft (2) includes an eccentric shaft portion (21) extending into the housing (10); Multiple swing cylinders (3) are arranged circumferentially around the periphery of the eccentric shaft (21), and each swing cylinder (3) has a plunger (30); The feature is that: each of the plungers (30) has an arc-shaped joint (31) at one end facing the eccentric shaft (21) that is adapted to the outer peripheral wall of the eccentric shaft (21), and an arc-shaped wear-resistant plate (4) is provided on one side wall of the arc-shaped joint (31) facing the eccentric shaft (21), and the arc-shaped wear-resistant plate (4) is in contact with the outer peripheral wall of the eccentric shaft (21).

2. The hydraulic motor according to claim 1, characterized in that: The arc-shaped wear-resistant plate (4) is detachably connected to the side wall of the arc-shaped joint (31).

3. The hydraulic motor according to claim 2, characterized in that: The arc-shaped joint (31) has a limiting groove on one side wall facing the eccentric shaft (21) for accommodating the arc-shaped wear-resistant plate (4). The arc-shaped joint (31) has opposing first side (311) and second side (312) along the circumference of the eccentric shaft (21). The limiting groove passes through the first side (311) and second side (312) along the circumference of the eccentric shaft (21).

4. The hydraulic motor according to claim 3, characterized in that: The arc-shaped joint (31) has a third side (313) and a fourth side (314) opposite to each other along the axial direction of the eccentric shaft (21). The third side (313) and the fourth side (314) are respectively provided with a first limiting groove (3130) and a second limiting groove (3140). The arc-shaped wear-resistant plate (4) is provided with a first limiting protrusion (41) on the side corresponding to the third side (313) that can be correspondingly inserted into the first limiting groove (3130). The arc-shaped wear-resistant plate (4) is provided with a second limiting protrusion (42) on the side corresponding to the fourth side (314) that can be correspondingly inserted into the second limiting groove (3140).

5. The hydraulic motor according to claim 4, characterized in that: The first limiting protrusion (41) and the second limiting protrusion (42) of the arc-shaped wear-resistant plate (4) both extend obliquely toward the side opposite to the concave direction of the arc-shaped wear-resistant plate (4).

6. The hydraulic motor according to claim 3, characterized in that: The bottom wall of the limiting groove of the arc-shaped joint (31) is provided with a lubricating oil groove (310) that extends circumferentially along the eccentric shaft (21).

7. The hydraulic motor according to claim 4, characterized in that: The housing (10) is further provided with a first limiting ring (50a) and a second limiting ring (50b) arranged axially at intervals along the eccentric shaft (21). The third side (313) of the arc-shaped joint (31) of each plunger (30) is limited to the radial inner side of the first limiting ring (50a), and the fourth side (314) of the arc-shaped joint (31) of each plunger (30) is limited to the radial inner side of the second limiting ring (50b).

8. The hydraulic motor according to claim 7, characterized in that: The first limiting ring (50a) and the second limiting ring (50b) each include an axial extension portion (51) and a radial extension portion (52) extending radially inward from one side of the axial extension portion (51). The third side portion (313) of the arc-shaped engagement portion (31) of each plunger (30) abuts against the radial extension portion (52) of the first limiting ring (50a) and is limited to the radial inner side of the axial extension portion (51) of the first limiting ring (50a). The fourth side portion (314) of the arc-shaped engagement portion (31) of each plunger (30) abuts against the radial extension portion (52) of the second limiting ring (50b) and is limited to the radial inner side of the axial extension portion (51) of the second limiting ring (50b).

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