Hydraulic plunger pump or motor and engineering machinery

Abstract

The utility model 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 utility model relates to hydraulic transmission technical field especially relates to a kind of hydraulic ram pump or motor and engineering machinery. BACKGROUND

[0002] Hydraulic ram pump or motor is normal when working, axial force and radial force will be generated. Axial force is generally balanced by static pressure support and selecting appropriate compression coefficient. While radial force is generally provided by single outer support bearing or spline to provide reliable radial constraint. If radial force is constrained radially by single outer support bearing, bearing is often abnormally worn due to unbalanced load, affecting the service life of the bearing. If radial force is constrained radially by spline, spline must be fitted with clearance to retain a certain degree of freedom to make cylinder and port plate completely fit, to achieve oil film support and lubrication. However, the clearance fit of spline will allow the cylinder to have a certain amount of yaw space. Under the action of overturning moment, the cylinder and port plate will be eccentrically worn due to insufficient radial constraint. The eccentric wear of cylinder or port plate will damage the oil film support and lubrication, and exacerbate the wear of the port surface, and eventually fail. SUMMARY

[0003] The utility model aims at providing a kind of hydraulic ram pump or motor and engineering machinery, can increase a support point for cylinder, make cylinder change from original spline single-point support to two-point support, effectively improve the stability and anti-overturning ability of cylinder.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] Hydraulic ram pump or motor, comprising:

[0006] Housing, main shaft, cylinder, plunger assembly, center elastic member, return plate, swash plate and port plate, the main shaft is partially located in the housing, and is rotatably connected with the housing. The cylinder is arranged in the housing, and the cylinder is provided with a center hole and a plunger hole. The cylinder is sleeved on the main shaft through the center hole, and is key-connected with 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. The other end of the center elastic member acts on the cylinder, so that the cylinder and the port plate form a port pair.

[0007] First support, arranged in the center hole and located on the side of the center elastic member close to the port plate, the first support is sleeved on the main shaft and supports the cylinder.

[0008] As a preferred technical solution of the hydraulic plunger pump or motor, the first bearing 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 of the hydraulic plunger pump or motor, the front part of the main shaft is supported by a first bearing, the rear part of the main shaft is supported by a second bearing, and the first bearing is arranged between the center elastic member and the second bearing.

[0010] As a preferred technical solution of the hydraulic plunger pump or motor, the hole wall of the center hole is provided with a check ring, the center elastic member abuts against the check ring at one end of the cylinder body, and the first bearing is arranged between the check ring and the second bearing.

[0011] As a preferred technical solution of the hydraulic plunger pump or motor, the main shaft comprises a first shaft part and a second shaft part, the diameter of the first shaft part is greater than the diameter of the second shaft part, a shaft shoulder is formed between the first shaft part and the second shaft part, the center elastic member is sleeved on the first shaft part, the second bearing is arranged on the second shaft part, and the first bearing is arranged between the shaft shoulder and the second bearing.

[0012] As a preferred technical solution of the hydraulic plunger pump or motor, a second bearing is further arranged between the outer circumferential wall of the cylinder body and the inner circumferential wall of the housing, and the second bearing is used to support the cylinder body.

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

[0014] The hydraulic plunger pump or motor comprises:

[0015] A housing, a main shaft, a cylinder body, a plunger assembly, a center elastic member, a return disc, a swash plate and a distribution disc, the main shaft is partially located in the housing and rotationally connected with the housing; the cylinder body is arranged in the housing, the cylinder body 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 keyed with the main shaft; the plunger assembly is slidingly arranged in the plunger hole; the center elastic member is arranged in the center hole and is sleeved on the main shaft, one end of the center elastic member acts on the return disc to make the return disc press the plunger assembly against the swash plate, and the other end of the center elastic member acts on the cylinder body to form a distribution pair with the distribution disc.

[0016] A second bearing is arranged between the outer circumferential wall of the cylinder body and the inner circumferential wall of the housing, and the second bearing is used to support the cylinder body.

[0017] As a preferred technical solution for the hydraulic plunger 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 plunger pump or motor as described in any of the above schemes.

[0019] Beneficial effects of the utility model:

[0020] The hydraulic plunger pump or motor provided by the utility model includes a first support member, which is disposed within a central hole and located on the side of the central elastic member closest to the valve plate. The first support member is sleeved around the main shaft and supports the cylinder body. The provision of the first support member provides an additional support point for the cylinder body, thereby increasing the cylinder body's support from a single spline point to two points, effectively improving the cylinder body's stability and anti-overturning capability.

[0021] The hydraulic piston pump or motor provided by the present invention includes a second support member disposed 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. The provision of the second support member provides an additional support point for the cylinder body, thereby increasing the cylinder body's stability and anti-overturning capability from the original single-point spline support to two-point support.

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

[0023] Figure 1 This is a schematic diagram of the structure of the hydraulic plunger pump or motor provided in the first embodiment of the present invention. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of the hydraulic plunger pump or motor provided in the first embodiment of the present invention. Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the structure of the hydraulic plunger pump or motor provided in the first embodiment of the present invention. Figure 3 ;

[0026] Figure 4 This is a structural diagram of a hydraulic plunger pump or motor provided in Example 2 of the present utility model.

[0027] In the picture:

[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. Port plate; 11. First bearing; 12. Second bearing; 13. Retaining 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 with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0031] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

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

[0033] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0034] Example 1

[0035] like Figures 1 to 3As shown, an embodiment of the utility model 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. 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 key-connected 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. This means that 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 requires a clearance fit, retaining a certain degree of freedom to enable the cylinder body 3 and the valve plate 10 to form a valve pair, achieving oil film support and lubrication. However, the use of a clearance fit in the key connection allows a certain amount of wiggle room in the cylinder body 3. Under the action of the overturning moment, the cylinder body 3 suffers from insufficient radial constraint, resulting in eccentric wear between the cylinder body 3 and the valve plate 10, which destroys the oil film support and lubrication, exacerbates wear on the valve plate, and ultimately fails.

[0037] To address the aforementioned issues, the hydraulic piston pump or motor provided in the embodiments of the present invention further includes a first support member 14, which is disposed within the center hole and located on the side of the central elastic member 5 near the port plate 10. The first support member 14 is sleeved around the main shaft 2 and supports the cylinder body 3. The provision of the first support member 14 provides an additional support point for the cylinder body 3, thereby increasing the cylinder body 3 from the original single-point spline support to two-point support, effectively improving the stability and anti-overturning capability of the cylinder body 3.

[0038] Optionally, the first support member 14 may be a bearing, see Figure 1 Alternatively, 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, referring to Figure 3 .

[0039] In this embodiment, the front portion of the main shaft 2 is supported by the first bearing 11, the rear portion of the main shaft 2 is supported by the second bearing 12, and the first support member 14 is disposed between the central elastic member 5 and the second bearing 12. By disposing 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 1and 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 that of the second shaft portion 202. A 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, and the first support member 14 is disposed between the shoulder and the second bearing 12. In other words, the first support member 14 is limited by the shoulder of the main shaft 2 and the second bearing 12, thereby preventing axial movement of the first support member 14. Furthermore, the limiting method is simple and easy to implement.

[0041] Optionally, refer to Figure 3 A retaining ring 13 is provided on the wall of the center hole, one end of the central 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] Example 2

[0043] like Figure 4 As shown, an embodiment of the utility model 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. 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 key-connected 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. The difference between this embodiment and the first embodiment lies in the different locations of the support points. In this embodiment, the hydraulic piston pump or motor further includes a second support member 15, which is disposed 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.

[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 supported at two points instead of the original single-point spline support, thereby effectively improving the stability and anti-overturning ability of the cylinder body 3 .

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

[0047] Example 3

[0048] An embodiment of the present utility model provides a hydraulic plunger pump or motor, 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, a distribution plate 10 and a first support member 14. 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 key-connected to the main shaft 2; the plunger assembly 4 is slidably arranged in the plunger hole; the central elastic member 5 is arranged in the center hole and sleeved on the main shaft 2, one end of the central 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 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.

[0049] The above structure is identical to that of Examples 1 and 2. This embodiment differs from these two in the number of support points on cylinder body 3. In this embodiment, the hydraulic piston pump or motor further comprises a first support member 14 and a second support member 15. The first support member 14 is disposed within the center hole and is located on the side of the elastic member proximal to the port plate 10. The first support member 14 is sleeved around the main shaft 2 and supports the cylinder body 3. The second support member 15 is disposed between the outer circumferential wall of the cylinder body 3 and the inner circumferential wall of the housing 1 and 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 single-point spline 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 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-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. 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), and the cylinder body (3) is provided with a center hole and a plunger hole, and 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 slant 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 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 of the main shaft (2) is supported by a first bearing (11), the rear 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 wall of the central hole, one end of the central elastic member (5) acts on the cylinder body (3) and abuts 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 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 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 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 shell (1), and 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), and the cylinder body (3) is provided with a center hole and a plunger hole, and 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 slant 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) is provided 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).

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 The hydraulic piston pump or motor comprises the hydraulic piston pump or motor according to any one of claims 1 to 9.

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