Steering oil cylinder and steering system for low-speed heavy-duty vehicle

Abstract

A steering oil cylinder and a steering system for a low-speed heavy-duty vehicle belong to the technical field of power-assisted oil cylinders, and comprise a hydraulic oil cylinder, one end of the hydraulic oil cylinder is connected with a ball head assembly, the ball head assembly comprises a ball pin, a ball pin seat and a ball head shell, the ball pin is inserted in the ball pin seat, the ball pin seat is installed in the ball head shell, and the ball pin seat is connected with the ball head shell. The elastic supporting body is arranged between the ball pin base and the ball head shell, installation of the elastic supporting body is facilitated, the ball head shell and the ball pin base are convenient to disassemble and assemble, the elastic supporting body is easier to maintain and replace, and due to the fact that the ball head shell has larger mass and rigidity, impact energy can be better absorbed and dispersed, the buffering performance is higher, and the service life of the ball pin base is prolonged. And the buffer performance can be adjusted and optimized more easily according to requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of power-assisted oil cylinders, in particular to a steering oil cylinder and a steering system for low-speed heavy-load vehicles. Background Art

[0002] The steering cylinder is a key component in the vehicle's power steering system. It is usually composed of a hydraulic pump, a hydraulic cylinder and a control valve. Its main working principle is to convert oil into pressure and transmit it to the steering mechanism to assist steering control. The stability and control accuracy of the steering cylinder are important guarantees for improving driving safety and control performance.

[0003] In order to improve stability and control accuracy, the existing steering cylinder end is connected to a ball head assembly, which directly drives the steering wheel through the hydraulic cylinder and eliminates the steering rod. In order to improve the deformation resistance of the ball head assembly, a buffer layer is often set between the ball pin and the ball pin seat to play a buffering role and reduce the impact force of the ball pin on the ball pin seat during use. At the same time, a ball is set between the ball pin and the ball pin seat to reduce the friction between the ball pin and the ball pin seat.

[0004] The existing setting method of the buffer layer in the steering cylinder ball head assembly needs to ensure that the buffer layer is closely matched with the ball pin and the ball pin seat to avoid excessive gap or friction during movement. The buffer layer processing accuracy requirements are high, and the buffer layer is easily affected by the relative movement between the ball pin and the ball pin seat and wears or is damaged, resulting in buffer failure. In addition, the setting position of the buffer layer is relatively hidden and the space is limited, making it difficult to maintain and replace, which increases the difficulty of subsequent maintenance. In addition, the use of the ball requires regular lubrication and maintenance, and the maintenance cost is high. Utility Model Content

[0005] In order to solve the technical problems in the above-mentioned background technology, such as the setting method of the buffer layer in the existing steering cylinder ball head assembly, high processing precision requirements, easy damage and failure of the buffer layer, and difficult maintenance, the utility model provides a steering cylinder and steering system for low-speed heavy-load vehicles.

[0006] The technical solution of this utility model is as follows:

[0007] The utility model provides a steering cylinder for low-speed and heavy-load vehicles, including a hydraulic cylinder, one end of the hydraulic cylinder is connected to a ball head assembly, the ball head assembly includes a ball pin, a ball pin seat and a ball head shell, the ball pin is inserted in the ball pin seat, the ball pin seat is installed in the ball head shell, and an elastic support body is provided between the ball pin seat and the ball head shell, which facilitates the installation of the elastic support body, and the ball head shell and the ball pin seat are easy to disassemble and assemble, making it easier to maintain and replace the elastic support body. Since the ball head shell has greater mass and rigidity, it can better absorb and disperse impact energy, has higher buffering performance, and is easier to adjust and optimize the buffering performance according to needs.

[0008] Preferably, a stepped mounting groove is provided inside the ball head shell, and the ball pin seat and the elastic support body are both installed in the stepped mounting groove. A retaining ring is detachably installed on the ball head shell, and the retaining ring cooperates with the stepped mounting groove to limit the ball pin seat and the elastic support body, preventing the ball pin seat and the elastic support body from falling out of the ball head shell. At the same time, the retaining ring is arranged for easy disassembly and assembly, and the elastic support body can be quickly replaced through the retaining ring.

[0009] Preferably, the ball pin seat is a self-lubricating structure, and there is no need to set up a ball structure. The overall structure is simple. While ensuring strength and lubrication ability, it can also achieve lubrication-free and maintenance-free functions, reducing maintenance frequency and cost.

[0010] Preferably, the ball head portion of the ball pin is rotatably arranged in the ball pin seat to achieve up and down bouncing of the wheel, steering movement of the wheel, absorption and buffering of vibrations, and improvement of durability of the connecting piece.

[0011] Preferably, the spherical diameter of the ball pin is Sφ60mm to enhance the strength of the ball pin.

[0012] Preferably, sealing sleeves are provided between the two sides of the ball head part and the ball pin seat and the ball head housing to achieve a sealing effect.

[0013] Preferably, the elastic support body is a shaft sleeve structure, which facilitates the connection between the elastic support body and the ball pin seat.

[0014] Preferably, the ball head housing and the hydraulic cylinder are threadedly connected to facilitate the connection between the ball head assembly and the hydraulic cylinder.

[0015] Preferably, a first oil port and a second oil port are sequentially provided on the cylinder barrel of the hydraulic oil cylinder along its axial direction for the hydraulic oil to enter and exit the hydraulic oil cylinder.

[0016] The utility model also provides a steering system, in which the hydraulic cylinder is connected to the steering arm or steering knuckle through a ball head assembly. The ball head assembly plays a role in connecting and transmitting steering force, eliminating the use of a steering rod and ensuring steering accuracy and stability.

[0017] It can be seen from the above technical solutions that the advantages of the present invention are:

[0018] 1. Since the ball head shell has a larger space, it is convenient to install the elastic support body, and the ball head shell and the ball pin seat are easy to disassemble and assemble, making it easier to maintain and replace the elastic support body. Since the ball head shell has a larger mass and rigidity, it can better absorb and disperse impact energy, has higher cushioning performance, and is easier to adjust and optimize the cushioning performance according to needs.

[0019] 2. The interior of the ball head housing is a stepped mounting groove, in which the ball pin seat and the elastic support body are both installed, and a retaining ring is detachably installed on the ball head housing. The retaining ring cooperates with the stepped mounting groove to limit the ball pin seat and the elastic support body, preventing the ball pin seat and the elastic support body from falling out of the ball head housing. It is also convenient for disassembly and assembly, and the retaining ring can be used to quickly replace the elastic support body.

[0020] 3. The ball pin seat is a self-lubricating structure, and there is no need to set up a ball structure. The overall structure is simple. While ensuring strength and lubrication ability, it can also achieve lubrication-free and maintenance-free functions, reducing maintenance frequency and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of the main structure of a steering cylinder for a low-speed heavy-load vehicle according to one or more embodiments of the present invention (partial cross-section);

[0023] The components represented by the reference numerals in the figure are:

[0024] 1. Hydraulic cylinder; 2. Ball joint assembly; 3. Ball pin; 4. Sealing sleeve; 5. Ball pin seat; 6. Elastic support body; 7. Retaining ring; 8. Ball joint housing; 9. First oil port; 10. Second oil port. DETAILED DESCRIPTION

[0025] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this patent.

[0026] Example 1

[0027] In a typical embodiment of the present invention, Figure 1 As shown, a steering cylinder for low-speed heavy-load vehicles is proposed, comprising: a hydraulic cylinder 1 and a ball head assembly 2, wherein one end of the cylinder barrel of the hydraulic cylinder 1 is fixedly connected to the ball head assembly 2 by a threaded connection.

[0028] The ball head assembly 2 includes a ball pin 3, a ball pin seat 5, an elastic support body 6 and a ball head housing 8. The ball head part of the ball pin 3 is inserted into the ball pin seat 5, and the ball pin 3 and the ball pin seat 5 are rotatably connected. The ball pin seat 5 is installed in the ball head housing 8, and the ball head housing 8 is threadedly connected to the end of the cylinder barrel of the hydraulic cylinder 1. The elastic support body 6 is fixedly arranged between the ball pin seat 5 and the ball head housing 8 to play a role in buffering and shock absorption, reduce the impact force on the ball pin seat 5 and the ball head housing 8, and improve the service life of the ball head assembly 2.

[0029] The elastic support body 6 in this embodiment is made of elastic materials such as rubber, and the elastic support body 6 is a shaft sleeve structure as a whole to play a role of buffering and shock absorption.

[0030] Since the ball head shell 8 has a larger space, the installation of the elastic support body 6 is facilitated, and the ball head shell 8 and the ball pin seat 5 are easy to disassemble and assemble, making it easier to maintain and replace the elastic support body 6. Since the ball head shell 8 has a larger mass and rigidity, it can better absorb and disperse impact energy, has higher buffering performance, and is easier to adjust and optimize the buffering performance according to needs.

[0031] The interior of the ball head housing 8 is a stepped mounting groove, in which the ball pin seat 5 and the elastic support body 6 are both installed, and a retaining ring 7 is detachably installed on the ball head housing 8. The retaining ring 7 cooperates with the stepped mounting groove to limit the ball pin seat 5 and the elastic support body 6, preventing the ball pin seat 5 and the elastic support body 6 from falling out from the ball head housing 8. The retaining ring 7 is an elastic structure, which is convenient for disassembly and assembly, and the retaining ring 7 can be used to quickly replace the elastic support body 6.

[0032] In this embodiment, the ball pin seat 5 is a self-lubricating structure and is made of self-lubricating materials, such as metal-based self-lubricating materials, composite self-lubricating materials, etc. There is no need to set up a ball structure. The overall structure is simple. While ensuring strength and lubrication ability, it can also achieve lubrication-free and maintenance-free functions, reducing maintenance frequency and cost.

[0033] In order to improve the strength of the ball head housing 8 and the ball pin 3, the ball head housing 8 is thickened, and the spherical diameter of the ball pin 3 is Sφ60 mm.

[0034] The ball head part of the ball pin 3 is placed in the ball pin seat 5, and a sealing sleeve 4 is provided between the two sides of the ball head part and the ball pin seat 5 and the ball head shell 8 to achieve a sealing effect. The sealing sleeve 4 adopts vulcanized rubber technology, has good protection effect under harsh working conditions and long service life.

[0035] A first oil port 9 and a second oil port 10 are provided on the cylinder barrel of the hydraulic oil cylinder 1 . The first oil port 9 and the second oil port 10 are sequentially arranged along the axial direction of the hydraulic oil cylinder 1 for the hydraulic oil to enter and exit the hydraulic oil cylinder 1 .

[0036] Example 2

[0037] In another typical embodiment of the present invention, a steering system is proposed, which adopts the steering cylinder mentioned in Example 1. One end of the hydraulic cylinder 1 is connected to the frame or other components, and the other end of the hydraulic cylinder 1 is connected to the steering arm or steering knuckle through the ball head assembly 2. The ball head assembly 2 plays the role of connecting and transmitting steering force, eliminating the use of the steering rod, and ensuring the accuracy and stability of steering.

[0038] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A steering cylinder for a low-speed, heavy-load vehicle, comprising: A hydraulic cylinder (1) is characterized in that one end of the hydraulic cylinder (1) is connected to a ball head assembly (2), the ball head assembly (2) comprises a ball pin (3), a ball pin seat (5) and a ball head housing (8), the ball pin (3) is inserted into the ball pin seat (5), the ball pin seat (5) is installed in the ball head housing (8), and an elastic support body (6) is provided between the ball pin seat (5) and the ball head housing (8).

2. The steering cylinder for low-speed heavy-load vehicles according to claim 1, characterized in that: A stepped mounting groove is provided inside the ball head housing (8), the ball pin seat (5) and the elastic support body (6) are both installed in the stepped mounting groove, and a retaining ring (7) is detachably mounted on the ball head housing (8).

3. The steering cylinder for low-speed heavy-load vehicles according to claim 1, characterized in that: The ball pin seat (5) is a self-lubricating structure.

4. The steering cylinder for low-speed heavy-load vehicles according to claim 1, characterized in that: The ball head portion of the ball pin (3) is rotatably arranged in the ball pin seat (5).

5. The steering cylinder for low-speed heavy-load vehicles according to claim 4, characterized in that: The spherical diameter of the ball pin (3) is Sφ60mm.

6. The steering cylinder for a low-speed heavy-load vehicle according to claim 4, characterized in that: Sealing sleeves (4) are provided between the two sides of the ball head portion and the ball pin seat (5) and the ball head housing (8).

7. The steering cylinder for a low-speed heavy-load vehicle according to claim 1, characterized in that: The elastic support body (6) is a shaft sleeve structure.

8. The steering cylinder for a low-speed heavy-load vehicle according to claim 1, characterized in that: The ball head housing (8) is threadedly connected to the hydraulic cylinder (1).

9. The steering cylinder for a low-speed heavy-load vehicle according to claim 1, characterized in that: A first oil port (9) and a second oil port (10) are sequentially provided on the cylinder barrel of the hydraulic oil cylinder (1) along its axial direction.

10. A steering system, characterized in that: A steering cylinder for a low-speed heavy-load vehicle as described in any one of claims 1 to 9 is used, wherein the hydraulic cylinder (1) is connected to a steering arm or a steering knuckle via a ball head assembly (2).

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