CN-122009308-A - Long-distance electric-adjustment steering column with double-screw structure

Abstract

The invention discloses a long-distance electric-adjustment steering column with a double-screw structure, which comprises a column body, an axial driving unit, a transmission mechanism and a connecting mechanism, wherein the transmission mechanism comprises a first screw rod, a first screw rod nut, a second screw rod and a second screw rod nut, the first screw rod is connected with the output end of the axial driving unit, the column body comprises an inner tube, a middle tube and an outer tube, the first screw rod nut is matched with the first screw rod to realize the transmission of the output torque of the axial driving unit through the first screw rod, the first screw rod nut enables the inner tube and the middle tube to slide relatively, and the second screw rod nut is matched with the second screw rod to realize the use of the output torque of the axial driving unit to drive the relative sliding of the middle tube and the outer tube. The invention realizes the long-distance stable adjustment of the steering column, and improves the driving comfort and the adjustment convenience.

Inventors

• QI YIJUN
• SUN KUN
• ZHANG XUEQIN
• WANG JIALIANG

Assignees

• 博世华域转向系统（烟台）有限公司

Dates

Publication Date

20260512

Application Date

20260326

Claims (12)

1. 1. The long-distance electric adjustment steering column with the double-screw structure is characterized by comprising a column body, an axial driving unit, a transmission mechanism and a connecting mechanism; The transmission mechanism comprises a first lead screw, a first lead screw nut, a second lead screw and a second lead screw nut, and the first lead screw is connected with the output end of the axial driving unit; The pipe column body comprises an inner pipe, a middle pipe and an outer pipe, wherein the inner pipe is sleeved in the middle pipe in a sliding manner, and the middle pipe is sleeved in the outer pipe in a sliding manner and is used for realizing the adjustment of the axial length; The connecting mechanism comprises an inner pipe connecting bracket, a middle pipe connecting bracket and an outer pipe connecting bracket, wherein the inner pipe connecting bracket is used for connecting an inner pipe with a first screw nut; The first screw nut is matched with the first screw to realize the transmission of the output torque of the axial driving unit through the first screw, the first screw nut enables the inner tube and the middle tube to slide relatively, The second screw rod is rigidly connected with the outer tube connecting bracket, the axial driving unit is connected with the middle tube through the middle tube connecting bracket, and the second screw rod nut is matched with the second screw rod to realize that the output torque of the axial driving unit is used for driving the middle tube and the outer tube to slide relatively.
2. 2. The electrically adjustable steering column according to claim 1, wherein the axial drive unit comprises a motor and a reduction gear set for reducing the rotational speed of the motor and increasing the torque at the first output and the second output.
3. 3. The electrically adjustable steering column of claim 2, wherein the reduction gear set comprises a three-stage drive, the first-stage drive comprises a worm and a first intermediate gear, the second-stage drive comprises a first intermediate gear and a second intermediate gear, the third-stage drive comprises a second intermediate gear, a three-stage driven first gear and a three-stage driven second gear, the second lead screw nut is coaxially fixed with the three-stage driven second gear, and the first lead screw is coaxially fixed with the three-stage driven first gear.
4. 4. The electrically adjustable steering column of claim 3, wherein the first intermediate gear comprises a primary driven gear and a secondary drive gear, and the second intermediate gear comprises a secondary driven gear and a tertiary drive gear.
5. 5. An electrically adjustable steering column according to claim 3, wherein the axial drive unit comprises a housing and a housing cover, the housing and housing cover having a first assembly tolerance compensating mechanism thereon to ensure proper installation of the worm.
6. 6. The electrically adjustable steering column according to claim 5, wherein the first assembly tolerance compensation mechanism comprises an O-ring and a motor shaft bushing.
7. 7. An electrically adjustable steering column according to claim 3, wherein the axial drive unit comprises a housing and a housing cover, the housing and housing cover having a second assembly tolerance compensation mechanism thereon to ensure proper installation of the second intermediate gear.
8. 8. The electrically adjustable steering column according to claim 7, wherein the second assembly tolerance compensation mechanism comprises a rubber pad and a metal washer.
9. 9. The electrically adjustable steering column of claim 3, wherein the axial drive unit comprises a housing and a housing cover, and wherein the housing and housing cover have a third assembly tolerance compensation mechanism thereon to ensure proper installation of the second lead screw nut.
10. 10. The electrically adjustable steering column according to claim 9, wherein the third assembly tolerance compensation mechanism comprises an O-ring and a metal gasket.
11. 11. The electrically adjustable steering column of claim 3, wherein the axial drive unit comprises a housing and a housing cover, and wherein the housing and housing cover have a fourth assembly tolerance compensation mechanism thereon to ensure proper installation of the first lead screw.
12. 12. The electrically adjustable steering column according to claim 11, wherein the fourth assembly tolerance compensation mechanism comprises a rubber pad and a metal washer.

Description

Long-distance electric-adjustment steering column with double-screw structure Technical Field The invention relates to the technical field of automobile steering, in particular to a long-distance electric adjustment steering column with a double-screw structure. Background In automotive design, the electric adjustment function of the steering column (including axial length and angular adjustment) is one of the key configurations to improve driving comfort. The existing electric adjustment steering column mostly has the problem of short adjustment stroke, along with popularization of intelligent driving, a steering wheel is not required in the future, and the steering wheel is required to be hidden under a specific use scene, so that the electric adjustment steering column is required to have an axial adjustment range with a larger stroke. In the development process of the long-distance electric control pipe column, the defects of low transmission efficiency, large control speed fluctuation, insufficient structural stability, large occupied space and the like exist. Specifically, as shown in fig. 8, a longer screw rod is used in the axial adjustment structure to meet the adjustment range of a long stroke, and the coaxiality of the screw rod is difficult to control due to the fact that the screw rod is too long under the limitation of the existing processing technology, so that the axial adjustment speed is greatly fluctuated. Specifically, as shown in fig. 9, a longer screw is used, and because the screw cannot be shortened, when the pipe column is axially stored to the shortest distance, the rear end of the screw can invade the pipe column enveloping outer space, which is not beneficial to the whole vehicle arrangement. Disclosure of Invention The invention aims to solve the technical problems that an automobile steering column has short electric adjustment stroke, low transmission efficiency, large adjustment speed fluctuation, insufficient structural stability, large occupied space and the like; the invention aims to provide a long-distance electric adjustment steering column, which realizes long-distance stable adjustment and improves driving comfort and adjustment convenience. In order to solve the technical problems, the long-distance electric adjustment steering column with the double-screw structure comprises a column body, an axial driving unit, a transmission mechanism and a connecting mechanism; The transmission mechanism comprises a first lead screw, a first lead screw nut, a second lead screw and a second lead screw nut, and the first lead screw is connected with the output end of the axial driving unit; The pipe column body comprises an inner pipe, a middle pipe and an outer pipe, wherein the inner pipe is sleeved in the middle pipe in a sliding manner, and the middle pipe is sleeved in the outer pipe in a sliding manner and is used for realizing the adjustment of the axial length; The connecting mechanism comprises an inner pipe connecting bracket, a middle pipe connecting bracket and an outer pipe connecting bracket, wherein the inner pipe connecting bracket is used for connecting an inner pipe with a first screw nut; The first screw nut is matched with the first screw to realize the transmission of the output torque of the axial driving unit through the first screw, the first screw nut enables the inner tube and the middle tube to slide relatively, The second screw rod is rigidly connected with the outer tube connecting bracket, the axial driving unit is connected with the middle tube through the middle tube connecting bracket, and the second screw rod nut is matched with the second screw rod to realize that the output torque of the axial driving unit is used for driving the middle tube and the outer tube to slide relatively. Preferably, the axial drive unit comprises a motor and a reduction gear set for reducing the rotational speed of the motor and increasing the torque at the first output and the second output. The speed reduction gear set comprises three-stage transmission, wherein the first-stage transmission consists of a worm and a first intermediate gear, the second-stage transmission consists of a first intermediate gear and a second intermediate gear, the third-stage transmission consists of a second intermediate gear, a third-stage driven first gear and a third-stage driven second gear, a second screw nut is coaxially fixed with the third-stage driven second gear, and a first screw is coaxially fixed with the third-stage driven first gear. Preferably, the first intermediate gear comprises a primary driven gear and a secondary driving gear, and the second intermediate gear comprises a secondary driven gear and a tertiary driving gear. Preferably, the axial drive unit comprises a housing and a housing cover; Preferably, the housing and housing cover have a first assembly tolerance compensating mechanism to ensure proper installation of the worm. The first assembly tolerance compensa