Low-cost inner pull rod structure with noise elimination function

Abstract

The utility model relates to the technical field of steering systems, in particular to a low-cost inner pull rod structure with a noise elimination function. A low-cost inner pull rod structure with a noise elimination function comprises an inner pull rod and is characterized in that the connecting end face of the inner pull rod is a plane, a plurality of knurled grooves are formed in the connecting end face, and the knurled grooves are evenly distributed in the circumference of the connecting end face. Compared with the prior art, the inner pull rod structure which is low in cost and has the noise elimination function is provided, a plurality of knurled grooves are additionally formed in the whole circumference of the end face of an existing inner pull rod, a machining area is defined, tightening torque matched with a rack is not affected, and the assembling mode of the inner pull rod structure and other parts is not affected.

Description

Technical Field

[0001] This utility model relates to the field of steering system technology, specifically a low-cost internal tie rod structure with noise reduction function. Background Technology

[0002] The steering gear tie rod assembly consists of an outer ball joint and an inner tie rod. The inner tie rod is connected to the rack by a thread. When the rack of the steering gear moves to its end, the end face of the inner tie rod contacts the inner wall of the steering gear housing or the damping ring, which plays a role in mechanical limiting.

[0003] To reduce the turning radius, the customer added an agile steering function to their vehicle. When this function is activated, the rack moves to its end, and the inner tie rod end face continues to compress the damping ring, increasing the steering gear travel. When the function ends, the damping ring is compressed, and the inner tie rod and damping ring are tightly fitted. The existing inner tie rod end face is a flat structure. When the customer counter-steers, the tie rod moves in the opposite direction, and the inner tie rod tends to disengage from the damping ring. Under the influence of force, the inner tie rod and damping ring undergo relative displacement. At this point, static friction is converted into dynamic friction. The difference between static and dynamic friction causes stress release, leading to the tie rod colliding with the damping ring and producing abnormal noise.

[0004] The common solution is to apply oil to the end face of the inner tie rod to eliminate friction noise. This can solve the problem in the short term, but the noise problem will reappear over time due to the evaporation of the lubricating oil. At the same time, the lubricating oil will affect the tightening torque of the inner tie rod and the rack, so it cannot completely solve the problem. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, this utility model provides a low-cost inner tie rod structure with noise reduction function. During the movement of the inner tie rod away from the damping ring, the impact of the inner tie rod on the end face of the damping ring is reduced, thereby improving the noise performance of the steering gear during operation.

[0006] To achieve the above objectives, a low-cost internal tie rod structure with noise reduction function is designed, including an internal tie rod, characterized in that: the connecting end face of the internal tie rod is a plane, and a plurality of knurled grooves are provided on the connecting end face, and the plurality of knurled grooves are evenly distributed on the circumference of the connecting end face.

[0007] The knurled groove is a long, arc-shaped groove, with one end of the knurled groove facing the center of the inner tie rod connection end face and the other end of the knurled groove facing the outer edge of the inner tie rod connection end face.

[0008] The knurled grooves are provided with at least 24.

[0009] The height of the knurled groove is 0.5mm to 1mm, and the distance between two adjacent knurled grooves is 0.5mm to 2mm.

[0010] The connecting end face of the inner tie rod is connected to the damping ring at the end of the rack.

[0011] Compared with the prior art, this utility model provides a low-cost internal tie rod structure with noise reduction function. Several knurled grooves are added to the entire circumference of the existing internal tie rod end face, and a machining area is defined. This will not affect the tightening torque with the rack, nor will it affect the assembly method with other parts.

[0012] Increasing the roughness of the inner tie rod end face will increase the static friction force when the inner tie rod compresses the damping ring. This will reduce the radial displacement when the tie rod disengages from the damping ring, optimize impact energy, improve the noise performance of the steering gear, and enhance the overall steering comfort of the vehicle. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the end face of the inner tie rod of this utility model.

[0014] Figure 2 This is a side view of the internal tie rod of the present invention.

[0015] Figure 3 This is a side view of the inner tie rod end face.

[0016] Figure 4 This is a schematic diagram of the installation of the inner tie rod of this utility model. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] like Figures 1 to 3 As shown, the connecting end face 1-1 of the inner tie rod 1 is a plane, and a number of knurled grooves 1-2 are provided on the connecting end face 1-1, and the number of knurled grooves 1-2 are evenly distributed on the circumference of the connecting end face 1-1.

[0019] The knurled groove 1-2 is a long, circular arc groove, with one end of the knurled groove 1-2 facing the center of the inner tie rod connection end face, and the other end of the knurled groove 1-2 facing the outer edge of the inner tie rod connection end face.

[0020] There are at least 24 knurled grooves 1-2.

[0021] The height of the knurled grooves 1-2 is 0.5mm~1mm, and the distance between two adjacent knurled grooves 1-2 is 0.5mm~2mm.

[0022] The connecting end face 1-1 of the inner tie rod 1 is connected to the damping ring at the end of the rack.

[0023] The length of the knurled groove 1-2 can be determined according to the diameter of the rack and the diameter of the connecting end face 1-1 of the inner tie rod 1. The knurled groove 1-2 is formed by milling on the basis of the original inner tie rod.

[0024] Tie rod suppliers can simulate production lines to mill individual inner tie rod parts, which can achieve the end face tooth profile.

[0025] like Figure 4 The diagram shows the connection between the inner tie rod and the rack, damping ring, and other structures. 1 is the inner tie rod, 2 is the outer ball joint, 3 is the nut, 4 is the housing, 5 is the damping ring, and 6 is the rack. The addition of knurled grooves increases the roughness of the connecting end face 1-1 of the inner tie rod 1. This increases the static friction between the inner tie rod 1 and the damping ring 5 when the inner tie rod 1 compresses the damping ring 5. Consequently, the radial displacement of the inner tie rod 1 when it disengages from the damping ring 5 is reduced, optimizing impact energy, improving the noise performance of the steering gear, and enhancing the overall steering comfort of the vehicle.

[0026] This invention increases the static friction with the damping ring by adding several knurled grooves to the end face of the inner tie rod, thereby eliminating impact noise. This solves the noise problem without reducing the service life of the tie rod, and has significant practical and realistic implications for production.

[0027] This new prototype has been mass-produced and installed into EPS assembly mechanisms. After evaluation on the vehicle, the abnormal noise was eliminated and the vehicle manufacturer accepted it as a solution that can be used for mass production.

Claims

1. A low-cost inner pull rod structure with noise reduction function, comprising an inner pull rod, characterized in that: The connecting end surface (1-1) of the inner pull rod (1) is a plane, a plurality of knurled grooves (1-2) are arranged on the connecting end surface (1-1), and the plurality of knurled grooves (1-2) are uniformly distributed on the circumference of the connecting end surface (1-1).

2. The low-cost inner pull rod structure with noise elimination function according to claim 1, characterized in that: The knurled groove (1-2) is an arc-shaped long groove, one end of the knurled groove (1-2) faces the center of the connecting end surface of the inner pull rod, and the other end of the knurled groove (1-2) faces the outer edge of the connecting end surface of the inner pull rod.

3. The low-cost inner pull rod structure with noise elimination function according to claim 1 or 2, characterized in that: The knurled groove (1-2) is at least provided with 24 knurled grooves.

4. The low-cost inner pull rod structure with noise elimination function according to claim 1 or 2, characterized in that: The height of the knurled groove (1-2) is 0.5mm-1mm, and the spacing between adjacent two knurled grooves (1-2) is 0.5mm-2mm.

5. The low-cost inner pull rod structure with noise elimination function according to claim 1, characterized in that: The connecting end surface (1-1) of the inner pull rod (1) is connected with the damping ring at the end of the rack.

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