Rack bushing suitable for steering engine with double-pinion structure

Abstract

The utility model relates to the technical field of steering engines, in particular to a rack bushing suitable for a steering engine of a double-pinion structure, which comprises a bushing body, a rack tooth back matching area and a rack tooth surface matching area are arranged on the inner surface of the bushing body, and the rack tooth back matching area and the rack tooth surface matching area are oppositely arranged. The inner diameter of the rack tooth back matching area is smaller than that of the rack tooth surface matching area, convex lugs and supporting blocks are arranged at one end of the bush body at intervals, the number of the convex lugs is the same as that of the supporting blocks, the convex lugs extend outwards along the outer wall of the bush body, and the supporting blocks extend in the axial direction of the bush body. Compared with the prior art, due to the design of different inner diameters of the rack tooth back matching area and the rack tooth surface matching area, when the rack generates small deflection, the rack tooth back matching area supports the rack in the radial direction, and the radial deflection amount of the rack is reduced; in the normal use process, the tooth surface is prevented from making contact with a rack tooth surface matching area, and the abnormal abrasion and noise risks are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steering machines, in particular to a rack bushing suitable for a steering machine with a double pinion structure. Background Art

[0002] With the transition from fuel vehicles to new energy vehicles, the front axle load of the vehicle continues to increase, the requirements for the radial stiffness of the rack are getting higher and higher, and the demand for radial support of the rack is growing.

[0003] In the gear rack meshing structure of the double-pinion steering gear, effective radial support for the rack can reduce the risk of rack breakage and failure and solve the noise problem caused by excessive rack runout.

[0004] At present, the common optimization solution for radial support of rack is to add rack bushing. Conventional rack bushing is a full-circle design and is not suitable for rack support of steering gear with double pinion structure.

[0005] Therefore, it is necessary to design a rack bushing suitable for a double pinion structure steering gear to achieve radial support of the rack, thereby reducing the radial runout of the rack and improving noise performance. Summary of the invention

[0006] The utility model aims to overcome the deficiencies of the prior art and provides a rack bushing suitable for a steering gear with a double pinion structure, so as to realize radial support of the rack, thereby reducing the radial deflection of the rack and improving noise performance.

[0007] In order to achieve the above-mentioned purpose, the utility model is a rack bushing suitable for a double pinion structure steering gear, comprising a bushing body, the inner surface of the bushing body is provided with a rack tooth back matching area and a rack tooth surface matching area, the rack tooth back matching area is opposite to the rack tooth surface matching area, and the inner diameter of the rack tooth back matching area is smaller than the inner diameter of the rack tooth surface matching area, one end of the bushing body is provided with lugs and support blocks at intervals, the number of the lugs and the support blocks is the same, the lugs are expanded outwardly along the outer wall of the bushing body, the support blocks extend along the axial direction of the bushing body, and the outer surface of the support block located in the rack tooth back matching area or the rack tooth surface matching area is provided with a circumferential limit block.

[0008] The outer wall of the bushing body is interference fit with the steering gear housing, the lug is embedded in the groove of the steering gear housing, the rack tooth back matching area contacts the rack tooth back, and an avoidance space is provided between the rack tooth surface matching area and the rack tooth surface.

[0009] The lug is provided with an inclined surface.

[0010] There are three lugs and three supporting blocks.

[0011] The other end surface of the bushing body is provided with a chamfered structure.

[0012] The other end of the bushing body is evenly distributed with grooves one.

[0013] A second groove is arranged between adjacent lugs and the supporting block.

[0014] The number of the first groove is the same as that of the second groove, and the first groove and the second groove are arranged along the axial direction of the bushing body.

[0015] The cross section of the circumferential limit block is semicircular.

[0016] Compared with the prior art, the utility model is designed with different inner diameters in the rack tooth back matching area and the rack tooth surface matching area. When the rack has a small deflection, the rack tooth back matching area provides radial support to the rack, thereby reducing the radial deflection of the rack. During normal use, the tooth surface is prevented from contacting the rack tooth surface matching area, thereby reducing the risk of abnormal wear and noise, thereby meeting the use requirements of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 It is the front view of the utility model.

[0019] Figure 3 It is the installation diagram of the utility model. DETAILED DESCRIPTION

[0020] The utility model is now further described with reference to the accompanying drawings.

[0021] See also Figure 1 , Figure 2 The utility model is a rack bushing suitable for a steering gear with a double pinion structure, comprising a bushing body, the inner surface of the bushing body 1 is provided with a rack tooth back matching area 2 and a rack tooth surface matching area 6, the rack tooth back matching area 2 is arranged opposite to the rack tooth surface matching area 6, and the inner diameter of the rack tooth back matching area 2 is smaller than the inner diameter of the rack tooth surface matching area 6, one end of the bushing body 1 is provided with lugs 3 and support blocks 5 at intervals, the number of lugs 3 and support blocks 5 is the same, the lugs 3 are expanded outwardly along the outer wall 10 of the bushing body 1, the support blocks 5 extend along the axial direction of the bushing body 1, and the outer surface of the support block 5 located in the rack tooth back matching area 2 or the rack tooth surface matching area 6 is provided with a circumferential limit block 4.

[0022] The support block 5 plays a supporting role during assembly, facilitating press assembly on the production line. The cross section of the circumferential limit block 4 is semicircular, and the circumferential limit block 4 is used for circumferential direction limit error prevention to ensure that different matching states of the tooth surface and tooth back can be reliably distinguished during assembly.

[0023] See also Figure 3The outer wall 10 of the bushing body 1 is interference fit with the steering gear housing 12, ensuring that the bushing body 1 and the steering gear housing 12 are always in close contact, avoiding the occurrence of gaps and side knocking noise. The lug 3 is embedded in the groove of the steering gear housing 12, thereby realizing the axial self-positioning of the bushing body 1. In order to facilitate the installation of the lug 3 and the steering gear housing 12, the lug 3 is provided with an inclined surface. The rack tooth back matching area 2 contacts the tooth back of the rack 11, and an avoidance space is provided between the rack tooth surface matching area 6 and the tooth surface of the rack 11.

[0024] After CAE simulation analysis, the rack 11 has the maximum deflection in the direction of the tooth surface under normal use conditions. The clearance between the rack tooth surface matching area 6 and the tooth surface of the rack 11 can ensure that the tooth surface of the rack 11 will not contact the bushing body 1 during normal use, avoiding abnormal wear and scraping noise.

[0025] Preferably, there are three lugs 3 and three supporting blocks 5 .

[0026] The other end surface of the bushing body 1 is provided with a chamfered structure 7 to facilitate guidance during assembly.

[0027] The other end of the bushing body 1 is evenly distributed with grooves 8. Between the adjacent lugs 3 and the support block 5, there are grooves 9. The number of grooves 8 and grooves 9 is the same, and grooves 8 and grooves 9 are arranged along the axial direction of the bushing body 1. Grooves 8 and grooves 9 allow the bushing body 1 to be slightly deformed during the press-fitting process to balance the press-fitting force of the bushing body 1.

[0028] The utility model adopts different inner diameter designs for the rack tooth back matching area and the rack tooth surface matching area. When the rack has a small deflection, the rack tooth back matching area provides radial support for the rack, thereby reducing the radial deflection of the rack. During normal use, contact between the tooth surface and the rack tooth surface matching area is avoided, thereby reducing the risk of abnormal wear and noise, thereby meeting the use requirements of the entire vehicle.

Claims

1. A rack bushing suitable for a double pinion structure steering gear, comprising a bushing body, characterized in that: The inner surface of the bushing body (1) is provided with a rack tooth back matching area (2) and a rack tooth surface matching area (6); the rack tooth back matching area (2) and the rack tooth surface matching area (6) are arranged opposite each other, and the inner diameter of the rack tooth back matching area (2) is smaller than the inner diameter of the rack tooth surface matching area (6); lugs (3) and support blocks (5) are arranged at intervals at one end of the bushing body (1); the number of lugs (3) and support blocks (5) is the same; the lugs (3) are spread outward along the outer wall (10) of the bushing body (1); the support blocks (5) extend along the axial direction of the bushing body (1); and a circumferential limit block (4) is provided on the outer surface of the support block (5) located in the rack tooth back matching area (2) or the rack tooth surface matching area (6).

2. A rack bushing suitable for a double pinion steering gear according to claim 1, characterized in that: The outer wall (10) of the bushing body (1) is interference-fitted with the steering gear housing (12), the lug (3) is embedded in a groove of the steering gear housing (12), the rack tooth back matching area (2) is in contact with the tooth back of the rack (11), and an escape space is provided between the rack tooth surface matching area (6) and the tooth surface of the rack (11).

3. The rack bushing suitable for a double pinion steering gear according to claim 2, characterized in that: The lug (3) is provided with an inclined surface.

4. The rack bushing suitable for a double pinion steering gear according to claim 1, characterized in that: There are three lugs (3) and three supporting blocks (5).

5. The rack bushing suitable for a double pinion steering gear according to claim 1, characterized in that: The other end surface of the bushing body (1) is provided with a chamfered structure (7).

6. The rack bushing suitable for a double pinion steering gear according to claim 1, characterized in that: The other end of the bushing body (1) is evenly distributed with grooves 1 (8).

7. The rack bushing suitable for a double pinion steering gear according to claim 1, characterized in that: A second groove (9) is provided between adjacent lugs (3) and the support block (5).

8. A rack bushing suitable for a double pinion structure steering gear according to claim 6 or 7, characterized in that: The number of the first groove (8) and the second groove (9) is the same, and the first groove (8) and the second groove (9) are arranged along the axial direction of the bushing body (1).

9. The rack bushing suitable for a double pinion steering gear according to claim 1, characterized in that: The cross section of the circumferential limit block (4) is semicircular.

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