Lightweight yoke and sealing structure of automobile rear wheel steering gear

Abstract

The invention relates to the technical field of automobiles, and discloses an automobile rear wheel steering gear lightweight yoke and sealing structure which comprises a rear wheel steering gear shell, a sliding bearing is arranged on the inner side of the rear wheel steering gear shell, a reciprocating connecting rod is arranged in the sliding bearing, one end of the connecting rod is provided with a yoke, and the other end of the connecting rod is provided with a sealing ring. And the yoke is positioned on the mounting side and is in interference fit with the yoke bushing. According to the light-weight joint fork and the sealing structure of the automobile rear wheel steering gear, the joint fork main body is made of the aluminum alloy material, so that the problem of heavy weight of the joint fork of the rear wheel steering gear is solved, and the weight reduction requirement of a rear wheel steering gear assembly is met. The yoke bushing of a steel piece is designed between the yoke and the connecting rod, and the steel gasket is also designed between the yoke bolt and the yoke main body, so that the structural strength of the yoke, the connecting rod and the bolt which are subjected to large stress is ensured, and in addition, the sealing ring is designed on the end face of the connecting rod matched with the yoke bushing, so that the problem of poor waterproof sealing performance of the yoke and the connecting rod is solved; and the waterproof sealing performance of the steering gear assembly is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of automobiles, in particular to a lightweight yoke and sealing structure of an automobile rear wheel steering gear. Background Art

[0002] The rear-wheel steering gear is a key component in the vehicle steering system. It is mainly used to control the steering action of the rear wheels of the vehicle. It works in conjunction with the front-wheel steering system to change the steering angle of the rear wheels according to the vehicle's speed, driving operation and dynamic conditions.

[0003] The yoke is a key connecting component in the rear-wheel steering system of a car. It is located between the steering gear and the rear wheel steering knuckle. One end is precisely connected to the output shaft of the steering gear, and the other end is firmly connected to the rear wheel steering knuckle. Its core function is to efficiently transmit steering power and accurately change the direction of force, thereby realizing the steering action of the rear wheels. For example, in the common multi-link rear-wheel steering system, the yoke plays a key role as a link between the upper and lower parts, transmitting the steering force and movement generated by the steering gear to the rear wheel steering knuckle, so that the rear wheels can steer according to the predetermined trajectory.

[0004] An existing yoke structure is shown in the attached Figure 1 As shown in the figure, it includes five parts, a rear wheel steering gear housing 101, a sliding bearing 102, a connecting rod 103, a yoke 104 and a yoke bolt 105. The yoke 104 is fixed to the connecting rod 103 by the yoke bolt 105. The connecting rod 103 reciprocates in the sliding bearing 102. The existing yoke 104 is made of steel, generally made of 40Cr, as shown in the attached figure. Figure 2 As shown, the yoke 104 is connected to the connecting rod 103 and the yoke bolt 105, and the yoke 104 is a part, and there are no other parts on the end surface that cooperates with the connecting rod 103 and the yoke bolt 105.

[0005] The above-mentioned prior art has the following disadvantages: First, the yoke 104 is made of steel, which is heavy and is not conducive to the lightweight requirement of the steering gear assembly; Secondly, as a part used on the automobile chassis, the steering gear assembly has waterproof requirements. After the yoke bolt 105 is tightened with the yoke 104, the yoke 104 and the connecting rod 103 need to be waterproof. Otherwise, muddy water or other liquids can easily enter into the rear wheel steering gear housing 101 through the yoke bolt 105 and the gap between the connecting rod 103 and the yoke 104, posing a great risk to the waterproofness of the steering gear assembly.

[0006] It can be seen that a lightweight yoke and sealing structure for a rear wheel steering gear of an automobile is needed to solve the problem mentioned in the above background technology that the existing equipment is heavy, which is not conducive to the lightweight demand of the steering gear assembly, and the steering gear assembly needs to have good waterproofness. Summary of the invention

[0007] The purpose of the present invention is to provide a lightweight yoke and sealing structure for a rear wheel steering gear of an automobile, so as to solve the problem in the above background technology that the existing equipment is heavy, which is not conducive to the lightweight demand of the steering gear assembly, and the steering gear assembly needs to have better waterproofness.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: A lightweight yoke and sealing structure of a rear wheel steering gear of an automobile, comprising a rear wheel steering gear housing, a sliding bearing is arranged on the inner side of the rear wheel steering gear housing, and a reciprocating connecting rod is arranged in the sliding bearing, a yoke is press-fitted on one end of the connecting rod, and the yoke is located at the press-fit side and is interference-fitted with a yoke bushing, the yoke and the yoke bushing fix the yoke on the connecting rod through a yoke bolt and a yoke gasket, the end face of the connecting rod has a circle of grooves, and a sealing ring is installed in the groove; The yoke material is aluminum alloy, titanium alloy and carbon fiber; The yoke bushing and yoke gasket are made of steel; The sealing ring is a rubber part; The connecting rod and the yoke bolt are steel parts.

[0009] Preferably, the sealing ring is arranged at the end where the connecting rod and the yoke are connected.

[0010] Preferably, the yoke is a "U"-shaped structure as a whole, and the yoke bolt is located in the middle position of the inner side of the yoke.

[0011] Preferably, a threaded hole is provided inside the connecting rod, and the yoke bolt passes through the yoke and extends to the threaded hole inside the connecting rod to be connected thereto.

[0012] Preferably, the cross section of the groove of the connecting rod mounting sealing ring is square, rectangular or semicircular, and the cross section of the sealing ring matches it.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are: First, the present invention solves the problem of heavy weight of the rear wheel steering gear yoke because the yoke body is made of aluminum alloy, and meets the requirement of weight reduction of the rear wheel steering gear assembly. A steel yoke bushing is designed between the yoke and the connecting rod, and a steel gasket is also designed between the yoke bolt and the yoke body, so as to ensure the structural strength of the position where the yoke, the connecting rod and the bolt are subjected to large forces. In addition, a sealing ring is designed on the connecting rod end face matched with the yoke bushing, which solves the problem of poor waterproof sealing of the yoke and the connecting rod, and ensures the waterproof sealing of the steering gear assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a yoke structure of a rear wheel steering gear of an automobile in the prior art; Figure 2An exploded view of the yoke structure of a rear wheel steering gear for an automobile in the prior art and a partial cross-sectional view of the yoke; Figure 3 This is a diagram of the lightweight yoke and seal structure of the present invention; Figure 4 It is a cross-sectional view of the lightweight yoke and sealing structure of the present invention.

[0015] Among them: 201, rear wheel steering gear housing; 202, sliding bearing; 203, connecting rod; 204, yoke; 205, yoke bushing; 206, sealing ring; 207, yoke gasket; 208, yoke bolt. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1-Figure 4 A lightweight yoke and sealing structure for a rear wheel steering gear of an automobile, wherein the yoke 204 is made of aluminum alloy, the yoke bushing 205 and the yoke gasket 207 are made of steel, the sealing ring 206 is a rubber part, the connecting rod 203 and the yoke bolt 208 are steel parts, the yoke bushing 205 and the yoke 204 are interference fit, and the yoke 204 is first pressed before being assembled to the connecting rod 203. There is a circle of grooves on the end surface of the connecting rod 203, and the sealing ring 206 is installed in the groove of the connecting rod 203. The yoke 204 and the yoke bushing 205 fix the yoke 204 on the connecting rod 203 through the yoke bolt 208 and the yoke gasket 207, and the connecting rod 203 reciprocates in the sliding bearing 202.

[0018] In this embodiment, the yoke used in the rear wheel steering gear is composed of a part, the material of which is 40Cr steel, and there is no sealing structure between the yoke and the connecting rod. The yoke structure in this embodiment is composed of four parts: a yoke, a yoke bushing, a yoke gasket and a sealing ring. The yoke is made of aluminum alloy or a material with a lower density than 40Cr steel, such as titanium alloy and carbon fiber material.

[0019] In this embodiment, the yoke bushing 205 and the yoke gasket 207 can be designed to be made of steel material, or other alloy steel or materials with higher strength and hardness than the yoke 204 material, in order to ensure the structural strength of the entire yoke structure at the point where the force is greater.

[0020] In this embodiment, the seal between the connecting rod 203 and the yoke bushing may be a sealing ring 206 structure as shown in the drawings, or may be filled with sealant or other sealing liquids.

[0021] In this embodiment, the cross-section of the groove for installing the sealing ring of the connecting rod 203 can be square or rectangular, or semicircular. In addition to being designed with a square or rectangular cross-section structure as shown in the figure of this technical solution, the sealing ring 206 can also be designed with a circular cross-section structure. The material can be rubber such as NBR, HNBR or EPDM.

[0022] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A lightweight yoke and sealing structure for a rear wheel steering gear of an automobile, comprising a rear wheel steering gear housing (201), characterized in that: A sliding bearing (202) is arranged on the inner side of the rear wheel steering gear housing (201), and a reciprocating connecting rod (203) is arranged in the sliding bearing (202); a yoke (204) is installed at one end of the connecting rod (203), and the yoke (204) is located at the installation side and is interference-fitted with a yoke bushing (205); the yoke (204) and the yoke bushing (205) are used to fix the yoke (204) on the connecting rod (203) via a yoke bolt (208) and a yoke gasket (207); the end surface of the connecting rod (203) has a circle of grooves, and a sealing ring (206) is installed in the grooves; The material of the yoke (204) is aluminum alloy, titanium alloy and carbon fiber; The yoke bushing (205) and the yoke gasket (207) are made of steel; The sealing ring (206) is a rubber part; The connecting rod (203) and the yoke bolt (208) are steel parts.

2. A lightweight yoke and sealing structure for a rear wheel steering gear of an automobile according to claim 1, characterized in that: The sealing ring (206) is arranged at the end where the connecting rod (203) and the yoke (204) are connected.

3. The lightweight yoke and sealing structure of a rear wheel steering gear of an automobile according to claim 1, characterized in that: The yoke (204) is an overall U-shaped structure, and the yoke bolt (208) is located in the middle of the inner side of the yoke (204).

4. The lightweight yoke and sealing structure of a rear wheel steering gear of an automobile according to claim 1, characterized in that: A threaded hole is provided inside the connecting rod (203), and the yoke bolt (208) penetrates the yoke (204) and the yoke gasket (207) and extends to the threaded hole inside the connecting rod (203) to be connected thereto.

5. The lightweight yoke and sealing structure of a rear wheel steering gear of an automobile according to claim 1, characterized in that: The cross section of the groove of the connecting rod (203) for mounting the sealing ring (206) is square, rectangular or semicircular, and the cross section of the sealing ring (206) matches it.

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