CN-117500716-B - Steering device

CN117500716BCN 117500716 BCN117500716 BCN 117500716BCN-117500716-B

Abstract

A steering device includes a cylindrical support tube (17) for rotatably supporting a steering shaft (2), a speed reducer (20) for applying torque to the steering shaft (2), and a housing (18) having a cylindrical portion (41) for housing the speed reducer (20). A flange (31) of the support cylinder (17) and the cylindrical portion (41) are coaxially arranged and are connected to each other by bolts (30). The bearing support member (50) is fitted to the inner peripheral surface of the cylindrical portion (41). The steering shaft (2) penetrates the bearing support member (50). A bearing (71) is disposed between the outer peripheral surface of the steering shaft (2) and the inner peripheral surface of the bearing support member (50). The bearing support member (50) has deformation allowing portions (55, 56, 59) configured to allow elastic deformation in the radial direction of the bearing support member (50).

Inventors

KAWAMURA NAOSHI
ASAKAWA KAZUHISA
NAMIKI HIROAKI
Rong Zheye
Fujiki Yuki
Sugiura Tomohisa
ITO KOSUKE
Mei Tengxiaoqi
Zhong Qiuguixiong
MURAKAMI YOSHIAKI

Assignees

株式会社捷太格特
株式会社捷太格特转向管柱系统

Dates

Publication Date: 20260508
Application Date: 20220209
Priority Date: 20210625

Claims (9)

1. A steering apparatus, comprising: a cylindrical support tube having a flange and rotatably supporting the steering shaft; A speed reducer configured to apply torque to the steering shaft; a housing having a cylindrical portion accommodating the speed reducer, the cylindrical portion being disposed coaxially with the flange; A bolt that connects the flange and the cylindrical portion to each other; a bearing support member fitted to an inner peripheral surface of the cylindrical portion and penetrated by the steering shaft, and A bearing interposed between an outer peripheral surface of the steering shaft and an inner peripheral surface of the bearing support member, The bearing support member has a wall portion extending in a radial direction and a deformation allowing portion configured to allow the elastic deformation of the bearing support member in the radial direction, The deformation allowing portion includes a first slit provided to the wall portion, The first slit is an annular groove extending continuously in the circumferential direction along the outer peripheral surface of the bearing support member, The deformation allowing part further includes a second slit provided to the wall part, The second slit is an annular groove located radially inward of the first slit and extending continuously in the circumferential direction along the inner circumferential surface of the bearing support member.
2. The steering device according to claim 1, wherein, The bearing support member has a peripheral wall, the wall portion being an end wall extending radially inward from an end portion in an axial direction of the peripheral wall, The end wall has a first end face and a second end face on opposite sides from each other in the axial direction, The first slit and the second slit are provided on the same one of the first end face and the second end face, or on mutually different end faces of the first end face and the second end face.
3. The steering device according to claim 2, wherein, The first end face is provided with the first slit and the second slit, The second end face has: a plurality of concave parts arranged at intervals along the circumferential direction in the area of the second end surface between the first slit and the second slit, and A plurality of ribs that are portions of the bearing support member between two of the recesses adjacent in the circumferential direction.
4. The steering device according to any one of claim 1 to 3, wherein, The bearing support member and the cylindrical portion have engaging portions that engage with each other in an axial direction of the bearing support member.
5. The steering device according to claim 4, wherein, The engagement portion includes an outer protruding strip extending in a circumferential direction along an outer peripheral surface of the bearing support member, and a groove extending in a circumferential direction along an inner peripheral surface of the cylindrical portion, The outward protruding strip is engaged with the groove in the axial direction of the bearing support member.
6. The steering device according to claim 4, wherein, The bearing support member has a peripheral wall, an end wall extending radially inward from an end portion in an axial direction of the peripheral wall, and a corner portion formed at a portion where the peripheral wall and the end wall intersect, The engaging portion includes a step portion extending in a circumferential direction along an inner peripheral surface of the cylindrical portion and the corner portion of the bearing support member, The corner portion is engaged with the step portion in the axial direction of the bearing support member.
7. The steering device according to any one of claim 1 to 3, wherein, The bearing support member has an inward protruding strip extending in a circumferential direction along an inner peripheral surface of the bearing support member, The inward protruding strip is engaged with the bearing in the axial direction of the bearing support member.
8. The steering device according to any one of claim 1 to 3, wherein, The linear expansion coefficients of the bearing support member and the housing are different from each other.
9. The steering device according to any one of claims 1 to 3, wherein the speed reducer has a worm wheel integrally rotated with the steering shaft and a worm engaged with the worm wheel, The housing has a worm wheel housing part accommodating the worm wheel and a worm housing part accommodating the worm, The cylindrical portion is the worm gear housing component.

Description

Steering device Technical Field The present disclosure relates to steering devices. Background Conventionally, there is an electric power steering apparatus that assists steering operation by a motor. For example, the steering device of patent document 1 includes a motor and a metal housing. The housing accommodates the torque sensor and the worm gear mechanism. The motor generates a torque corresponding to the steering torque detected by the torque sensor. The torque of the motor is transmitted to the steering shaft via the worm gear mechanism. The housing has a worm housing part and a sensor housing part. The worm housing member accommodates a worm wheel mechanism. The sensor housing member houses a torque sensor. The worm housing member and the sensor housing member are fitted to each other in the axial direction of the steering shaft. The steering shaft is rotatably supported by the worm housing member and the sensor housing member via bearings. Patent document 1 Japanese patent application laid-open No. 2020-90139 Disclosure of Invention In recent years, demands of customers for steering devices have been diversified based on specifications of vehicles and the like. In order to meet these demands, various researches and developments are being made on the structure of the steering device. There is also a need for a steering device having a new structure. The steering device according to one aspect of the present disclosure includes a cylindrical support tube having a flange and rotatably supporting a steering shaft, a speed reducer configured to apply torque to the steering shaft, a housing having a cylindrical portion accommodating the speed reducer, the cylindrical portion being disposed coaxially with the flange, a bolt connecting the flange and the cylindrical portion to each other, a bearing support member fitted to an inner peripheral surface of the cylindrical portion and penetrating the steering shaft, and a bearing interposed between an outer peripheral surface of the steering shaft and an inner peripheral surface of the bearing support member. The bearing support member has a deformation allowing portion configured to allow elastic deformation in a radial direction of the bearing support member. Drawings Fig. 1 is a schematic view showing a structure of an embodiment of a steering device. Fig. 2 is a perspective view of the steering column of fig. 1. Fig. 3 is a cross-sectional view of a coupling portion of the housing and the down tube of fig. 2. Fig. 4 is a perspective view of the bearing support member of fig. 3 viewed obliquely from above. Fig. 5 is a perspective view of the bearing support member of fig. 3 viewed obliquely from below. Fig. 6 is a cross-sectional perspective view of the bearing support member of fig. 3. Fig. 7 is a cross-sectional perspective view of the bearing support member of fig. 3. Fig. 8 is a cross-sectional view of the bearing support member of fig. 3. Fig. 9 is a cross-sectional view of a bearing support member according to another embodiment. Fig. 10 is a cross-sectional view of a bearing support member according to another embodiment. Detailed Description An embodiment of the steering device will be described. As shown in fig. 1, the steering device 1 includes a steering shaft 2, an intermediate shaft 3, a pinion shaft 4, and a rack shaft 5. The steering wheel 6 is coupled to a first end of the steering shaft 2. The first end of the intermediate shaft 3 is coupled to the second end of the steering shaft 2 via a universal joint 7. The first end of the pinion shaft 4 is coupled to the second end of the intermediate shaft 3 via a universal joint 8. A pinion 4a is provided at a second end of the pinion shaft 4. The pinion 4a is engaged with a rack 5a provided on the rack shaft 5. The rack shaft 5 is supported inside a housing 10 of a frame 9 fixed to a vehicle body. The rack shaft 5 is movable in a left direction or a right direction with respect to the traveling direction of the vehicle. Both ends of the rack shaft 5 are connected to left and right steering wheels (not shown) via tie rods (not shown). The steering shaft 2 has an outer shaft 11 and an inner shaft 12. The outer shaft 11 and the inner shaft 12 are coupled to each other by, for example, spline coupling. The outer shaft 11 and the inner shaft 12 are integrally rotatable and movable relative to each other in the axial direction. The steering shaft 2 is provided with a steering wheel 6 facing upward and inclined with respect to the front-rear direction of the vehicle. The steering device 1 has a steering column 15. The steering shaft 2 is inserted through the steering column 15. The steering shaft 2 is rotatably supported by a steering column 15 via a bearing (not shown). The steering column 15 is mounted on two frames 13, 14 provided to the vehicle body. One frame 13 is located further rearward than the other frame 14 in the front-rear direction of the vehicle. The steering column 15 has an upper tube 16