Swash plate structure for high-pressure closed pump

Abstract

The utility model discloses a swash plate structure for a high-pressure closed pump, which is characterized in that the root part of a trunnion (1) of a swash plate extends outwards in the radial direction to form a cylindrical boss (2), the height of the boss (2) is 0.2-0.4 times of the length of the trunnion (1), and the diameter of the boss (2) is 1.4-1.8 times of the diameter of the trunnion (1); round corners (3) are arranged at the root of the boss (2) and the top of the boss (2). The radius of the fillet (2) at the root of the boss (2) is 1mm, and the radius of the fillet (3) at the top of the boss (2) is 0.5 mm; a blind hole is formed in the inner side wall of the swash plate, the blind hole and the trunnion (1) are coaxial, the blind hole extends into the trunnion (1), and a reinforcing shaft (4) in close fit is arranged in the blind hole. The utility model has the advantage of being not easy to damage.

Description

Technical Field

[0001] This utility model belongs to the field of high-pressure closed-loop piston pumps, and particularly relates to a swashplate structure for high-pressure closed-loop pumps. Background Technology

[0002] High-pressure closed-loop piston pumps are widely used in construction machinery such as truck cranes, crawler cranes, road rollers, and aerial work platforms. Compared to open-loop hydraulic systems, closed-loop hydraulic systems, composed of high-pressure closed-loop piston pumps, hydraulic motors, and cylinders, simplify pipeline connections, significantly saving installation space and reducing leakage and vibration issues caused by pipeline connections, thus improving system reliability. Closed-loop hydraulic systems reduce the chance of air entering the hydraulic fluid, resulting in smoother operation. Furthermore, high-pressure closed-loop piston pumps can directly control the flow direction of the output hydraulic fluid, ensuring a smooth transition and avoiding hydraulic shocks caused by various valves in open systems. Therefore, high-pressure closed-loop piston pumps are increasingly favored by OEMs.

[0003] High-pressure closed-loop piston pumps are widely used in large-scale engineering equipment such as civil / national defense construction and emergency rescue, including full-face tunneling machines, high-flow emergency rescue and drainage vehicles, all-terrain rescue vehicles, and cotton harvesters. They face complex working conditions such as high pressure and strong impact, alternating loads, forward and reverse variable impacts, and high-speed response. Currently, their core variable component, the swashplate, faces problems such as poor high pressure and strong impact resistance, short service life, and easy breakage of the trunnion.

[0004] As a core component of the variable displacement system in a high-pressure closed-loop piston pump, the swashplate bears the swashplate torque generated by the high pressure in the piston chamber and the forces from the variable displacement cylinder. The material of the swashplate varies depending on the application of the piston pump, with yield strength ranging from 200MPa to 885MPa. The trunnion of the swashplate frequently actuates the variable displacement cylinder, placing higher demands on the trunnion under complex conditions such as high pressure and strong impact, alternating loads, forward and reverse variable displacement impacts, and high-speed response. The strength and lifespan of the trunnion directly determine the service life of the entire pump. In practical applications, trunnion fracture at the root is a common cause of swashplate damage. This is mainly because the root has the largest lever arm and bears the greatest torque when the trunnion is under stress. Utility Model Content

[0005] The purpose of this invention is to provide a swashplate structure for a high-pressure closed-loop pump. This invention has the advantage of being less prone to damage.

[0006] The technical solution of this utility model is: a swashplate structure for a high-pressure closed-loop pump, wherein the root of the trunnion of the swashplate extends radially outward to form a cylindrical boss, the height of the boss is 0.2-0.4 times the length of the trunnion, and the diameter of the boss is 1.4-1.8 times the diameter of the trunnion.

[0007] In the aforementioned swashplate structure for a high-pressure closed-circuit pump, both the root and top of the boss are provided with rounded corners.

[0008] In the aforementioned swashplate structure for a high-pressure closed-circuit pump, the radius of the fillet at the root of the boss is 1 mm, and the radius of the fillet at the top of the boss is 0.5 mm.

[0009] In the aforementioned swashplate structure for a high-pressure closed-circuit pump, a blind hole is provided on the inner sidewall of the swashplate. The blind hole is coaxial with the trunnion and extends into the trunnion. A tightly fitted reinforcing shaft is provided inside the blind hole.

[0010] In the aforementioned swashplate structure for high-pressure closed-circuit pumps, the diameter of the reinforcing shaft is 0.5-0.6 times the diameter of the trunnion.

[0011] In the aforementioned swashplate structure for a high-pressure closed-circuit pump, the reinforcing shaft extends into the middle of the trunnion.

[0012] In the aforementioned swashplate structure for high-pressure closed-circuit pumps, the reinforcing shaft is made of HSLA1500 steel.

[0013] Compared with existing technologies, this invention improves the root structure of the trunnion based on the existing swashplate. By setting bosses of a specific size range at the root of the trunnion, the strength of the trunnion root is increased, the contact area between the trunnion root and the swashplate is increased, stress concentration is dispersed, and the trunnion root can withstand greater torque, improving fracture resistance. The trunnion is less prone to breakage, and the swashplate is less prone to damage. Therefore, this invention has the advantage of being less susceptible to damage.

[0014] In addition, by using a reinforcing shaft made of high-strength material to pass through the root of the trunnion, extra support is provided to the trunnion, enabling it to withstand greater torque without breaking. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of Example 1.

[0016] Figure 2 This is a cross-sectional view of the trunnion in Embodiment 2.

[0017] Figure 3 This is a 3D schematic diagram of an existing swashplate.

[0018] The markings in the attached diagram are: 1-trunnion, 2-boss, 3-rounded corner, 4-reinforcing shaft. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0020] Example 1: A swashplate structure for a high-pressure closed-loop pump, such as Figure 1As shown, the root of the trunnion 1 of the swash plate extends radially outward to form a cylindrical boss 2. The height of the boss 2 is 0.3 times the length of the trunnion 1, and the diameter of the boss 2 is 1.6 times the diameter of the trunnion 1.

[0021] Both the root and the top of the boss 2 are provided with rounded corners 3. The radius of the rounded corner 3 at the root of the boss 2 is 1mm, and the radius of the rounded corner 3 at the top of the boss 2 is 0.5mm.

[0022] Compared with existing swashplates, the swashplate of Example 1 has improved fracture resistance by about 30% using the same materials.

[0023] Example 2: Based on Example 1, a blind hole is provided on the inner sidewall of the swash plate. The blind hole is coaxial with the trunnion 1 and extends into the trunnion 1. A tightly fitted reinforcing shaft 4 is provided in the blind hole. The diameter of the reinforcing shaft 4 is 0.5-0.6 times the diameter of the trunnion 1. The reinforcing shaft 4 extends into the middle of the trunnion 1. The material of the reinforcing shaft 4 is HSLA1500 steel with a yield strength of 1500MPa or higher.

[0024] Compared with existing swashplates, the fracture resistance of the swashplate in Example 2 can be improved by up to 50%.

Claims

1. A swashplate structure for a high-pressure closed-loop pump, characterized in that: The root of the trunnion (1) of the swash plate extends radially outward to form a cylindrical boss (2). The height of the boss (2) is 0.2-0.4 times the length of the trunnion (1), and the diameter of the boss (2) is 1.4-1.8 times the diameter of the trunnion (1).

2. The swashplate structure for a high-pressure closed-loop pump according to claim 1, characterized in that: The root and top of the boss (2) are both provided with rounded corners (3).

3. The swashplate structure for a high-pressure closed-loop pump according to claim 2, characterized in that: The radius of the fillet (3) at the root of the boss (2) is 1 mm, and the radius of the fillet (3) at the top of the boss (2) is 0.5 mm.

4. The swashplate structure for a high-pressure closed-loop pump according to claim 1, characterized in that: The inner wall of the swash plate is provided with a blind hole, which is coaxial with the trunnion (1) and extends into the trunnion (1). A tight-fitting reinforcing shaft (4) is provided inside the blind hole.

5. The swashplate structure for a high-pressure closed-loop pump according to claim 4, characterized in that: The diameter of the reinforcing shaft (4) is 0.5-0.6 times the diameter of the trunnion (1).

6. The swashplate structure for a high-pressure closed-loop pump according to claim 4, characterized in that: The reinforcing shaft (4) extends into the middle of the trunnion (1).

7. The swashplate structure for a high-pressure closed-loop pump according to claim 4, characterized in that: The reinforcing shaft (4) is made of HSLA1500 steel.

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