Hydraulic plunger pump or motor and engineering machinery

Abstract

The invention belongs to the technical field of hydraulic transmission, and particularly relates to a hydraulic plunger pump or motor and engineering machinery. The hydraulic plunger pump or motor comprises a shell, a main shaft, a cylinder body, a plunger assembly, a center elastic piece, a return plate, a swash plate and a valve plate. The hydraulic cylinder further comprises a first supporting piece, the first supporting piece is arranged in the center hole and located on the side, close to the valve plate, of the center elastic piece, and the first supporting piece is arranged on the main shaft in a sleeving mode and supports the cylinder body. By arranging the first supporting piece, a supporting point can be additionally arranged for the cylinder body, the cylinder body is changed into two-point supporting from original spline single-point supporting, and the stability and the anti-overturning capacity of the cylinder body are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic transmission, and in particular to a hydraulic plunger pump or motor and engineering machinery. Background Art

[0002] When the hydraulic piston pump or motor is working normally, axial force and radial force will be generated. The axial force is generally balanced by static pressure support and selecting a suitable compression coefficient. The radial force is generally provided with reliable radial constraint by a single external support bearing or spline fit. If the radial force is radially constrained by a single external support bearing, the bearing will often wear abnormally due to eccentric load, affecting the service life of the bearing; if the radial force is radially constrained by a spline connection, the spline must adopt a clearance fit and retain a certain degree of freedom to make the cylinder body and the distribution plate fit completely to achieve oil film support and lubrication. However, the clearance fit of the spline will cause a certain amount of sway space in the cylinder body. Under the action of the overturning moment, the cylinder body and the distribution plate will experience eccentric wear due to insufficient radial constraint. The eccentric wear of the cylinder body or the distribution plate will destroy the oil film support and lubrication, aggravate the wear of the distribution surface, and then fail. Summary of the invention

[0003] The purpose of the present invention is to provide a hydraulic plunger pump or motor and engineering machinery, which can add a support point to the cylinder body, so that the cylinder body is changed from the original spline single-point support to a two-point support, effectively improving the stability and anti-overturning ability of the cylinder body.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] Hydraulic piston pump or motor, including:

[0006] A housing, a main shaft, a cylinder body, a plunger assembly, a center elastic member, a return plate, a swash plate and a distribution plate, wherein the main shaft portion is located in the housing and is rotatably connected to the housing; the cylinder body is arranged in the housing, and is provided with a center hole and a plunger hole, the cylinder body is sleeved on the main shaft through the center hole, and is key-connected to the main shaft; the plunger assembly is slidably arranged in the plunger hole; the center elastic member is arranged in the center hole and sleeved on the main shaft, one end of the center elastic member acts on the return plate, so that the return plate presses the plunger assembly against the swash plate, and the other end of the center elastic member acts on the cylinder body, so that the cylinder body and the distribution plate form a distribution pair;

[0007] The first support member is arranged in the center hole and is located on a side of the center elastic member close to the distribution plate. The first support member is sleeved on the main shaft and supports the cylinder body.

[0008] As a preferred technical solution for the hydraulic piston pump or motor, the first supporting member is a bearing, a steel ring or a plurality of steel balls distributed along the circumference of the main shaft.

[0009] As a preferred technical solution for the hydraulic piston pump or motor, the front of the main shaft is supported by a first bearing, the rear of the main shaft is supported by a second bearing, and the first support member is arranged between the central elastic member and the second bearing.

[0010] As a preferred technical solution for the hydraulic piston pump or motor, a retaining ring is provided on the hole wall of the center hole, one end of the center elastic member acting on the cylinder body abuts against the retaining ring, and the first support member is provided between the retaining ring and the second bearing.

[0011] As an optimal technical solution for a hydraulic piston pump or motor, the main shaft includes a first shaft portion and a second shaft portion, the diameter of the first shaft portion is larger than the diameter of the second shaft portion, a shoulder is formed between the first shaft portion and the second shaft portion, the central elastic member is sleeved on the first shaft portion, the second bearing is arranged on the second shaft portion, and the first support member is arranged between the shoulder and the second bearing.

[0012] As a preferred technical solution of the hydraulic piston pump or motor, it also includes a second support member, which is arranged between the outer peripheral wall of the cylinder body and the inner peripheral wall of the shell, and the second support member is used to support the cylinder body.

[0013] As a preferred technical solution for the hydraulic piston pump or motor, the second supporting member is a bearing, a steel ring or a plurality of steel balls distributed along the circumference of the cylinder body.

[0014] Hydraulic piston pump or motor, including:

[0015] A housing, a main shaft, a cylinder body, a plunger assembly, a center elastic member, a return plate, a swash plate and a distribution plate, wherein the main shaft portion is located in the housing and is rotatably connected to the housing; the cylinder body is arranged in the housing, and is provided with a center hole and a plunger hole, the cylinder body is sleeved on the main shaft through the center hole, and is key-connected to the main shaft; the plunger assembly is slidably arranged in the plunger hole; the center elastic member is arranged in the center hole and sleeved on the main shaft, one end of the center elastic member acts on the return plate, so that the return plate presses the plunger assembly against the swash plate, and the other end of the center elastic member acts on the cylinder body, so that the cylinder body and the distribution plate form a distribution pair;

[0016] The second support member is disposed between the outer peripheral wall of the cylinder body and the inner peripheral wall of the shell, and the second support member is used to support the cylinder body.

[0017] As a preferred technical solution for the hydraulic piston pump or motor, the second supporting member is a bearing, a steel ring or a plurality of steel balls distributed along the circumference of the cylinder body.

[0018] Engineering machinery, including the hydraulic piston pump or motor as described in any of the above schemes.

[0019] Beneficial effects of the present invention:

[0020] The hydraulic plunger pump or motor provided by the present invention comprises a first support member, which is arranged in the center hole and located on the side of the center elastic member close to the distribution plate, and the first support member is sleeved on the main shaft and supports the cylinder body. By arranging the first support member, a support point can be added to the cylinder body, so that the cylinder body is changed from the original spline single-point support to two-point support, which effectively improves the stability and anti-overturning ability of the cylinder body.

[0021] The hydraulic piston pump or motor provided by the present invention includes a second support member, which is arranged between the outer peripheral wall of the cylinder body and the inner peripheral wall of the housing, and is used to support the cylinder body. By arranging the second support member, a support point can be added to the cylinder body, so that the cylinder body is changed from the original spline single-point support to a two-point support, which effectively improves the stability and anti-overturning ability of the cylinder body.

[0022] The present invention provides an engineering machine, comprising the hydraulic plunger pump or motor provided by the present invention. By adopting the hydraulic plunger pump or motor, the reliability of the operation of the engineering machine can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The structure of the hydraulic piston pump or motor provided in the first embodiment of the present invention is shown in FIG. Figure 1 ;

[0024] Figure 2 The structure of the hydraulic piston pump or motor provided in the first embodiment of the present invention is shown in FIG. Figure 2 ;

[0025] Figure 3 The structure of the hydraulic piston pump or motor provided in the first embodiment of the present invention is shown in FIG. Figure 3 ;

[0026] Figure 4 It is a schematic diagram of the structure of the hydraulic plunger pump or motor provided in the second embodiment of the present invention.

[0027] In the figure:

[0028] 1. Housing; 2. Spindle; 3. Cylinder; 4. Plunger assembly; 5. Central elastic member; 6. Support pin; 7. Ball joint; 8. Return plate; 9. Swash plate; 10. Distribution plate; 11. First bearing; 12. Second bearing; 13. Snap ring; 14. First support member; 15. Second support member;

[0029] 201, first shaft portion; 202, second shaft portion. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] Embodiment 1

[0035] like Figures 1 to 3As shown, an embodiment of the present invention provides a hydraulic plunger pump or motor, including a housing 1, a main shaft 2, a cylinder body 3, a plunger assembly 4, a center elastic member 5, a return plate 8, a swash plate 9, a distribution plate 10 and a first support member 14, wherein the main shaft 2 is partially located in the housing 1 and is rotatably connected to the housing 1; the cylinder body 3 is arranged in the housing 1, and the cylinder body 3 is provided with a center hole and a plunger hole, the cylinder body 3 is sleeved on the main shaft 2 through the center hole, and is keyed to the main shaft 2; the plunger assembly 4 is slidably arranged in the plunger hole; the center elastic member 5 is arranged in the center hole and sleeved on the main shaft 2, one end of the center elastic member 5 acts on the return plate 8 through the support pin 6 and the ball joint 7, so that the return plate 8 presses the plunger assembly 4 against the swash plate 9, and the other end of the center elastic member 5 acts on the cylinder body 3, so that the cylinder body 3 and the distribution plate 10 form a distribution pair.

[0036] The cylinder body 3 and the main shaft 2 are connected by a key, that is, the radial force of the hydraulic piston pump or motor is radially constrained by the key connection between the cylinder body 3 and the main shaft 2. However, the key connection needs to adopt a clearance fit, and a certain degree of freedom must be retained to enable the cylinder body 3 and the distribution plate 10 to form a distribution pair to achieve oil film support and lubrication. However, the key connection adopts a clearance fit, which will cause a certain amount of sway space in the cylinder body 3. Under the action of the overturning moment, the cylinder body 3 and the distribution plate 10 will experience eccentric wear due to insufficient radial constraint, thereby destroying the oil film support and lubrication, aggravating the wear of the distribution surface, and then failing.

[0037] To solve the above problems, the hydraulic piston pump or motor provided in the embodiment of the present invention further includes a first support member 14, which is arranged in the center hole and located on the side of the center elastic member 5 close to the distribution plate 10. The first support member 14 is sleeved on the main shaft 2 and supports the cylinder body 3. By providing the first support member 14, a support point can be added to the cylinder body 3, so that the cylinder body 3 is changed from the original spline single-point support to a two-point support, which effectively improves the stability and anti-overturning ability of the cylinder body 3.

[0038] Optionally, the first support member 14 may be a bearing, see Figure 1 Optionally, the first support member 14 may also be a steel ring, see Figure 2 Optionally, the first support member 14 may also include a plurality of steel balls distributed along the circumference of the main shaft 2, as shown in FIG. Figure 3 .

[0039] In this embodiment, the front part of the main shaft 2 is supported by the first bearing 11, the rear part of the main shaft 2 is supported by the second bearing 12, and the first support member 14 is arranged between the central elastic member 5 and the second bearing 12. By arranging the first support member 14 between the central elastic member 5 and the second bearing 12, the space between the central elastic member 5 and the second bearing 12 can be fully utilized without affecting other structures.

[0040] Optionally, refer to Figure 1 and Figure 2 The main shaft 2 includes a first shaft portion 201 and a second shaft portion 202. The diameter of the first shaft portion 201 is larger than the diameter of the second shaft portion 202. A shaft shoulder is formed between the first shaft portion 201 and the second shaft portion 202. The central elastic member 5 is sleeved on the first shaft portion 201. The second bearing 12 is disposed on the second shaft portion 202. The first support member 14 is disposed between the shaft shoulder and the second bearing 12. That is, the first support member 14 is limited by the shaft shoulder of the main shaft 2 and the second bearing 12, which can prevent the first support member 14 from axial movement, and the limiting method is simple and easy.

[0041] Optionally, refer to Figure 3 The hole wall of the center hole is provided with a retaining ring 13, one end of the center elastic member 5 acting on the cylinder body 3 abuts against the retaining ring 13, and the first support member 14 is provided between the retaining ring 13 and the second bearing 12. That is, the first support member 14 is limited by the retaining ring 13 and the second bearing 12, which can prevent the first support member 14 from axial movement, and the limiting method is simple and easy.

[0042] Embodiment 2

[0043] like Figure 4 As shown, an embodiment of the present invention provides a hydraulic plunger pump or motor, including a housing 1, a main shaft 2, a cylinder body 3, a plunger assembly 4, a center elastic member 5, a return plate 8, a swash plate 9, a distribution plate 10 and a first support member 14, wherein the main shaft 2 is partially located in the housing 1 and is rotatably connected to the housing 1; the cylinder body 3 is arranged in the housing 1, and the cylinder body 3 is provided with a center hole and a plunger hole, the cylinder body 3 is sleeved on the main shaft 2 through the center hole, and is keyed to the main shaft 2; the plunger assembly 4 is slidably arranged in the plunger hole; the center elastic member 5 is arranged in the center hole and sleeved on the main shaft 2, one end of the center elastic member 5 acts on the return plate 8 through the support pin 6 and the ball joint 7, so that the return plate 8 presses the plunger assembly 4 against the swash plate 9, and the other end of the center elastic member 5 acts on the cylinder body 3, so that the cylinder body 3 and the distribution plate 10 form a distribution pair.

[0044] The above structure is the same as that of the first embodiment, and the difference between this embodiment and the first embodiment is that the support point is set at a different position. In this embodiment, the hydraulic piston pump or motor further includes a second support member 15, which is arranged between the outer peripheral wall of the cylinder body 3 and the inner peripheral wall of the housing 1, and the second support member 15 is used to support the cylinder body 3.

[0045] By providing the second support member 15 , a support point can be added to the cylinder body 3 , so that the cylinder body 3 is changed from the original single-point support of the spline to a two-point support, which effectively improves the stability and anti-overturning ability of the cylinder body 3 .

[0046] Optionally, the second support member 15 may be a bearing. Optionally, the second support member 15 may also be a steel ring. Optionally, the second support member 15 may also include a plurality of steel balls distributed along the circumference of the cylinder body 3.

[0047] Embodiment 3

[0048] An embodiment of the present invention provides a hydraulic piston pump or motor, including a housing 1, a main shaft 2, a cylinder body 3, a piston assembly 4, a center elastic member 5, a return plate 8, a swash plate 9, a distribution plate 10 and a first support member 14, wherein the main shaft 2 is partially located in the housing 1 and is rotatably connected to the housing 1; the cylinder body 3 is arranged in the housing 1, and the cylinder body 3 is provided with a center hole and a piston hole, the cylinder body 3 is sleeved on the main shaft 2 through the center hole, and is keyed to the main shaft 2; the piston assembly 4 is slidably arranged in the piston hole; the center elastic member 5 is arranged in the center hole and sleeved on the main shaft 2, one end of the center elastic member 5 acts on the return plate 8 through the support pin 6 and the ball joint 7, so that the return plate 8 presses the piston assembly 4 against the swash plate 9, and the other end of the center elastic member 5 acts on the cylinder body 3, so that the cylinder body 3 and the distribution plate 10 form a distribution pair.

[0049] The above structure is the same as that of the first and second embodiments. The difference between this embodiment and the first and second embodiments is that the number of supporting points of the cylinder body 3 is different. In this embodiment, the hydraulic piston pump or motor further includes a first support member 14 and a second support member 15. The first support member 14 is arranged in the center hole and is located on the side of the elastic member close to the distribution plate 10. The first support member 14 is sleeved on the main shaft 2 and supports the cylinder body 3. The second support member 15 is arranged between the outer peripheral wall of the cylinder body 3 and the inner peripheral wall of the housing 1. The second support member 15 is used to support the cylinder body 3.

[0050] By providing the first support member 14 and the second support member 15, two support points can be added to the cylinder body 3, so that the cylinder body 3 is changed from the original spline single-point support to a three-point support, and the stability and anti-overturning ability of the cylinder body 3 are further improved on the basis of the first and second embodiments.

[0051] The present invention further provides an engineering machine, comprising the hydraulic plunger pump or motor described in Embodiment 1, Embodiment 2 or Embodiment 3. By adopting the hydraulic plunger pump or motor, the reliability of the working of the engineering machine can be improved.

[0052] Optionally, the construction machinery may be a loader, a grader, a forklift, or an aerial vehicle.

[0053] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A hydraulic piston pump or motor, characterized in that: include: A housing (1), a main shaft (2), a cylinder body (3), a plunger assembly (4), a central elastic member (5), a return plate (8), a swash plate (9) and a distribution plate (10), wherein the main shaft (2) is partially located in the housing (1) and is rotatably connected to the housing (1); the cylinder body (3) is arranged in the housing (1), the cylinder body (3) is provided with a center hole and a plunger hole, the cylinder body (3) is sleeved on the main shaft (2) through the center hole, and is rotatably connected to the main shaft (2) ) key connection; the plunger assembly (4) is slidably arranged in the plunger hole; the central elastic member (5) is arranged in the central hole and sleeved on the main shaft (2); one end of the central elastic member (5) acts on the return plate (8), so that the return plate (8) presses the plunger assembly (4) against the inclined plate (9); the other end of the central elastic member (5) acts on the cylinder body (3), so that the cylinder body (3) and the distribution plate (10) form a distribution pair; It is characterized by further comprising: The first support member (14) is arranged in the center hole and is located on a side of the center elastic member (5) close to the distribution plate (10). The first support member (14) is sleeved on the main shaft (2) and supports the cylinder body (3).

2. The hydraulic piston pump or motor according to claim 1, characterized in that: The first supporting member (14) is a bearing, a steel ring or a plurality of steel balls distributed along the circumference of the main shaft (2).

3. The hydraulic piston pump or motor according to claim 1, characterized in that: The front part of the main shaft (2) is supported by a first bearing (11), the rear part of the main shaft (2) is supported by a second bearing (12), and the first supporting member (14) is arranged between the central elastic member (5) and the second bearing (12).

4. The hydraulic piston pump or motor according to claim 3, characterized in that: A retaining ring (13) is provided on the hole wall of the center hole, one end of the center elastic member (5) acts on the cylinder body (3) to abut against the retaining ring (13), and the first supporting member (14) is provided between the retaining ring (13) and the second bearing (12).

5. The hydraulic piston pump or motor according to claim 3, characterized in that: The main shaft (2) comprises a first shaft portion (201) and a second shaft portion (202); the diameter of the first shaft portion (201) is greater than the diameter of the second shaft portion (202); a shaft shoulder is formed between the first shaft portion (201) and the second shaft portion (202); the central elastic member (5) is sleeved on the first shaft portion (201); the second bearing (12) is arranged on the second shaft portion (202); and the first support member (14) is arranged between the shaft shoulder and the second bearing (12).

6. The hydraulic piston pump or motor according to any one of claims 1 to 5, characterized in that: It also comprises a second support member (15), wherein the second support member (15) is arranged between the outer peripheral wall of the cylinder body (3) and the inner peripheral wall of the shell (1), and the second support member (15) is used to support the cylinder body (3).

7. The hydraulic piston pump or motor according to claim 6, characterized in that: The second supporting member (15) is a bearing, a steel ring or a plurality of steel balls distributed along the circumference of the cylinder body (3).

8. Hydraulic piston pumps or motors, including: A housing (1), a main shaft (2), a cylinder body (3), a plunger assembly (4), a central elastic member (5), a return plate (8), a swash plate (9) and a distribution plate (10), wherein the main shaft (2) is partially located in the housing (1) and is rotatably connected to the housing (1); the cylinder body (3) is arranged in the housing (1), the cylinder body (3) is provided with a center hole and a plunger hole, the cylinder body (3) is sleeved on the main shaft (2) through the center hole, and is rotatably connected to the main shaft (2) ) key connection; the plunger assembly (4) is slidably arranged in the plunger hole; the central elastic member (5) is arranged in the central hole and sleeved on the main shaft (2); one end of the central elastic member (5) acts on the return plate (8), so that the return plate (8) presses the plunger assembly (4) against the inclined plate (9); the other end of the central elastic member (5) acts on the cylinder body (3), so that the cylinder body (3) and the distribution plate (10) form a distribution pair; It is characterized by further comprising: A second support member (15), wherein the second support member (15) is arranged between the outer peripheral wall of the cylinder body (3) and the inner peripheral wall of the shell (1), and the second support member (15) is used to support the cylinder body (3).

9. The hydraulic piston pump or motor according to claim 8, characterized in that: The second supporting member (15) is a bearing, a steel ring or a plurality of steel balls distributed along the circumference of the cylinder body (3).

10. Construction machinery, characterized in that: Comprising the hydraulic piston pump or motor as described in any one of claims 1-9.

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