A contact-clamp adjustable plunger return assembly

Abstract

This invention belongs to the technical field of hydraulic piston pump motors, specifically relating to a piston return assembly with adjustable contact clamping. It addresses the problem of unstable contact between the pressure plate and the ball cam during piston return motion, which easily leads to abnormal wear such as uneven wear and seizure. This invention provides a structural solution for a piston return assembly with adjustable contact clamping, comprising: a pressure plate, a ball cam, and an adjustable clamping component. During operation, the pressure plate and the ball cam form an adjustable-width contact ring. Even under external load disturbances, the position and width of the contact ring remain relatively stable, thus ensuring stable and reliable piston return motion. This invention has advantages such as simple structure, easy assembly, and good adaptability, and has positive significance for improving the reliability of variable-speed high-pressure piston pump motors.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic piston pump motor technology, specifically relating to a piston return assembly with adjustable contact clamping. Background Technology

[0002] Currently, hydraulic transmission systems are widely used in industries such as vehicles, ships, and construction machinery. The hydraulic piston pump motor involved is a core component, characterized by variable speed and high pressure.

[0003] The plunger return assembly is a key component of a hydraulic plunger pump motor. During high-speed rotation of the cylinder, the plunger return assembly presses the plunger assembly against the variable displacement swashplate, ensuring the plunger extends outward from the cylinder bore, thereby increasing the working volume. Because the plunger return assembly is located near the pump shaft center, the high-speed rotation of the pump rotor generates centrifugal force on the oil, resulting in poor heat dissipation. The contact zone between the pressure plate and the ball joint is adjustable in width, approximating a line contact state. This leads to high contact stress, difficulty in controlling the contact position, and a tendency for abnormal wear, causing unstable rotation, seizure, and ultimately, damage to the entire machine.

[0004] In view of the above, developing a plunger return assembly that is simple in structure, adaptable, and effectively improves the reliability of the system is a very urgent direction and goal that those skilled in the art need to strive to achieve. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] The technical problem to be solved by the present invention is: how to provide a plunger return assembly with adjustable contact clamping.

[0007] (II) Technical Solution

[0008] To solve the above-mentioned technical problems, the present invention provides a plunger return assembly with adjustable contact clamping, which includes: a pressure plate 1, a ball protrusion 2, and an adjustable clamping assembly 3;

[0009] The pressure plate 1 is a disc-shaped part, which is divided into two main functional structures from the outer diameter to the inner diameter: the outer side has the same number of through holes as the plunger assembly, which is used to press the plunger assembly; the inner side is a profile that contacts the ball convex 2, which is composed of multiple conical surfaces and rounded corners that are smoothly connected, and is used to form a contact ring after contacting the ball convex 2.

[0010] The spherical protrusion 2 is a spherical part with an inner hole through which the pump shaft passes. Its outer spherical surface contacts the inner surface of the pressure plate 1, and its axial end face is used to receive the clamping force applied by the adjustable clamping assembly 3.

[0011] The position of the contact ring formed by the contact between the pressure plate 1 and the ball protrusion 2 is determined by the diameter of the ball protrusion 2, and its width is determined by the clamping force of the adjustable clamping assembly 3.

[0012] The adjustable clamping assembly 3 includes a spring seat 4 and a spring 5. The spring seat 4 is an annular part with circumferentially distributed spring seat holes on one side for placing the spring 5. The spring 5 is arranged axially inside the spring seat 4, thereby applying a clamping force in the axial direction, so that the spring seat 4 is close to or away from the end face of the ball protrusion 2. The ball protrusion 2 is subjected to the clamping force of the spring 5 of the adjustable clamping assembly 3 and contacts the pressure plate 1 to form a contact ring with an adjustable width.

[0013] The number of springs 5 ​​is calculated based on parameters such as the piston pump motor speed, oil replenishment pressure, and piston diameter, and then adjusted according to the actual working effect, but it is necessary to ensure that they are centrally symmetrically distributed.

[0014] The pressure plate 1 is subjected to the spring clamping force of the adjustable clamping assembly 3 and contacts the ball protrusion 2 to form a contact ring with an adjustable width.

[0015] The inner surface of the pressure plate 1 that contacts the spherical protrusion 2 is composed of multiple conical surfaces and rounded corners that are smoothly connected.

[0016] The surface of the ball protrusion 2 that contacts the pressure plate 1 is spherical.

[0017] The adjustable clamping assembly 3 has a spring seat 4 with evenly distributed holes for placing springs 5. The number of springs can be adjusted according to actual needs, but the layout must be symmetrical.

[0018] The position of the controllable-width contact ring is determined by the diameter of the ball protrusion 2, and the initial width of the contact ring is determined by the clamping force of the adjustable clamping assembly 3.

[0019] (III) Beneficial Effects

[0020] Compared with existing technologies, this invention adopts a plunger return assembly design technology with adjustable contact clamping, which solves the problem of difficulty in adjusting and controlling the contact state of the pressure plate and ball cam, simplifies the machining difficulty of the inner surface of the pressure plate, eliminates abnormal wear problems such as uneven wear and seizing that may be caused between parts, and improves the reliability and adaptability of the plunger pump motor system.

[0021] This invention, through the design of an adjustable clamping component structure and the selection and distribution of an appropriate number of springs, can effectively control the contact position and contact width between the pressure plate and the ball convex, enabling safe relative movement between them. During operation, it avoids uneven wear and seizing, effectively improving the reliability of the system. Furthermore, this structure has the advantages of simple processing, good adaptability, and easy installation. Attached Figure Description

[0022] Figure 1 A schematic diagram of the adjustable contact clamping plunger return assembly provided by the present invention; in the figure: pressure plate 1, ball protrusion 2, adjustable clamping assembly 3, spring seat 4, spring 5. Detailed Implementation

[0023] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0024] To solve the above-mentioned technical problems, the present invention provides a plunger return assembly with adjustable contact clamping, which includes: a pressure plate 1, a ball protrusion 2, and an adjustable clamping assembly 3;

[0025] The pressure plate 1 is a disc-shaped part, which is divided into two main functional structures from the outer diameter to the inner diameter: the outer side has the same number of through holes as the plunger assembly, which is used to press the plunger assembly; the inner side is a profile that contacts the ball convex 2, which is composed of multiple conical surfaces and rounded corners that are smoothly connected, and is used to form a contact ring after contacting the ball convex 2.

[0026] The spherical protrusion 2 is a spherical part with an inner hole through which the pump shaft passes. Its outer spherical surface contacts the inner surface of the pressure plate 1, and its axial end face is used to receive the clamping force applied by the adjustable clamping assembly 3.

[0027] The position of the contact ring formed by the contact between the pressure plate 1 and the ball protrusion 2 is determined by the diameter of the ball protrusion 2, and its width is determined by the clamping force of the adjustable clamping assembly 3.

[0028] The adjustable clamping assembly 3 includes a spring seat 4 and a spring 5. The spring seat 4 is an annular part with circumferentially distributed spring seat holes on one side for placing the spring 5. The spring 5 is arranged axially inside the spring seat 4, thereby applying a clamping force in the axial direction, so that the spring seat 4 is close to or away from the end face of the ball protrusion 2. The ball protrusion 2 is subjected to the clamping force of the spring 5 of the adjustable clamping assembly 3 and contacts the pressure plate 1 to form a contact ring with an adjustable width.

[0029] The number of springs 5 ​​is calculated based on parameters such as the piston pump motor speed, oil replenishment pressure, and piston diameter, and then adjusted according to the actual working effect, but it is necessary to ensure that they are centrally symmetrically distributed.

[0030] The pressure plate 1 is subjected to the spring clamping force of the adjustable clamping assembly 3 and contacts the ball protrusion 2 to form a contact ring with an adjustable width.

[0031] The inner surface of the pressure plate 1 that contacts the spherical protrusion 2 is composed of multiple conical surfaces and rounded corners that are smoothly connected.

[0032] The surface of the ball protrusion 2 that contacts the pressure plate 1 is spherical.

[0033] The adjustable clamping assembly 3 has a spring seat 4 with evenly distributed holes for placing springs 5. The number of springs can be adjusted according to actual needs, but the layout must be symmetrical.

[0034] The position of the controllable-width contact ring is determined by the diameter of the ball protrusion 2, and the initial width of the contact ring is determined by the clamping force of the adjustable clamping assembly 3.

[0035] Example 1

[0036] like Figure 1 As shown, the adjustable-tightening plunger return assembly provided by the present invention includes a pressure plate 1 subjected to the spring clamping force of an adjustable-tightening assembly 3, which contacts a spherical protrusion 2 to form a contact ring with an adjustable width. The pressure plate 1 is a disc-shaped part, divided into two main functional structures from the outer diameter to the inner diameter: the outer side has the same number of through holes as the plunger assembly, used to clamp the plunger assembly; the inner side is a profile that contacts the spherical protrusion 2, composed of multiple conical surfaces and smooth transitions with rounded corners. The spherical protrusion 2 is a spherical part, with an inner hole through which the pump shaft passes, and an outer spherical surface in contact with the pressure plate 1.

[0037] The position of the contact ring formed by the contact between the pressure plate 1 and the ball protrusion 2 is determined by the diameter of the ball protrusion 2, and its width is determined by the clamping force of the adjustable clamping assembly 3.

[0038] The adjustable clamping assembly 3 consists of a spring seat 4 and a spring 5. The spring seat is a ring-shaped part with circumferentially distributed spring seat holes on one side for holding the springs. The number of springs can be calculated and determined based on parameters such as the piston pump motor speed, oil replenishment pressure, and piston diameter, and then adjusted according to the actual working effect, but it is necessary to ensure that they are centrally symmetrically distributed.

[0039] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A plunger return assembly with adjustable contact clamping, characterized in that, It includes: a pressure plate (1), a ball joint (2), and an adjustable clamping assembly (3); The pressure plate (1) is a disc-shaped part, which is divided into two major functional structures from the outer diameter to the inner diameter: the outer side has the same number of through holes as the plunger assembly, which is used to press the plunger assembly; the inner side is a profile that contacts the ball bump (2), which is composed of multiple conical surfaces and rounded corners that are smoothly connected, and is used to form a contact ring after contacting the ball bump (2); The ball protrusion (2) is a spherical part with an inner hole through which the pump shaft passes. Its outer spherical surface contacts the inner surface of the pressure plate (1), and its axial end face is used to receive the clamping force applied by the adjustable clamping assembly (3). The contact ring formed by the contact between the pressure plate (1) and the ball protrusion (2) is positioned by the diameter of the ball protrusion (2) and its width is determined by the clamping force of the adjustable clamping assembly (3). The adjustable clamping assembly (3) includes a spring seat (4) and a spring (5); the spring seat (4) is an annular part with circumferentially distributed spring seat holes on one side for placing the spring (5). The spring (5) is arranged axially inside the spring seat (4) to apply a clamping force in the axial direction, so that the spring seat (4) is close to or away from the end face of the ball protrusion (2). The ball protrusion (2) is subjected to the clamping force of the spring (5) of the adjustable clamping assembly (3) and contacts the pressure plate (1) to form a contact ring with an adjustable width.

2. The adjustable contact clamping plunger return assembly as described in claim 1, characterized in that, The number of springs (5) is calculated based on parameters such as the speed of the plunger pump motor, the oil replenishment pressure, and the plunger diameter, and is then adjusted based on the actual working effect, but it must be ensured that they are centrally symmetrically distributed.

3. The adjustable contact clamping plunger return assembly as described in claim 1, characterized in that, The surface of the ball protrusion (2) that contacts the pressure plate (1) is spherical.

4. The adjustable contact clamping plunger return assembly as described in claim 1, characterized in that, The component belongs to the field of hydraulic piston pump motor technology.

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