CN105128927B

CN105128927B - Electric power-assisted automobile steering gear

Info

Publication number: CN105128927B
Application number: CN201510622920.1A
Authority: CN
Inventors: 纪国庆; 陈波; 牛永春; 纪业; 於炳辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-09-28
Filing date: 2015-09-28
Publication date: 2021-10-01
Anticipated expiration: 2035-09-28
Also published as: CN105128927A

Abstract

The invention discloses an electric power-assisted automobile steering device which comprises a steering control system (2) and a steering power-assisted system, wherein the steering power-assisted system comprises a motor (1), a cycloidal pin gear reducer assembly (3) and a spiral bevel gear reducer assembly (4), the motor (1) is connected with the spiral bevel gear reducer assembly (4) through the cycloidal pin gear reducer assembly (3), and the steering control system is connected with the spiral bevel gear reducer assembly (4). The invention adopts the motor as the output power, has ingenious structural design, is environment-friendly and reliable, can obtain larger torque output, leads the steering to be light and sensitive, and simultaneously can reduce the energy consumption of an automobile steering system.

Description

Electric power-assisted automobile steering gear

Technical Field

The invention relates to an automobile steering gear, in particular to an electric power-assisted automobile steering gear, which outputs large torque.

Background

At present, hydraulic power-assisted steering devices are arranged on large electric motor coaches, large new energy coaches and heavy automobiles for light steering. CN200948815Y discloses a utility model named as "automobile power steering gear", which includes a power cylinder, a control valve, a torsion bar, an input shaft, an end cover, a steering screw, a steering nut, a steering rocker shaft, a steering rocker, a side cover soft oil seal, etc. The steering nut is assembled with the steering screw, the steering nut is arranged in the power cylinder body, one end of the steering screw is assembled with the control valve body, and six oil grooves in an inner hole of the steering screw are numerical control indexing special-shaped oil grooves which are low in manufacturing cost and high in machining efficiency; the input shaft is connected with a torsion bar, the end head of the torsion bar is assembled with the steering screw rod, and the sealing between the torsion bar and the steering screw rod adopts clearance sealing. The side cover is assembled with the steering rocker shaft, the sealing between the side cover and the steering rocker shaft adopts the combination sealing of a side cover soft oil seal, an O-shaped sealing ring and a check ring, the side cover is fixed at one side of an inner hole of the power cylinder body, and the excircle sealing between the side cover and the steering rocker shaft adopts safer double-O-shaped sealing ring sealing. Although the hydraulic power steering gear can provide large steering power, the hydraulic power steering gear has a complex structure and large energy consumption, so that the possibility of oil leakage exists in the using process, the power steering fails, and the reliability is greatly reduced. In order to solve the problem, people have developed an electric power steering, and a utility model named as "recirculating ball type electric power steering" is disclosed in CN203318493U, which includes recirculating ball type mechanical steering, a speed reducer, a motor, a sensor and a controller, the upper part of the left side of the steering housing is fixedly connected with the speed reducer housing, inside the speed reducer, a steering transmission shaft is flexibly connected with the input end of the steering gear by an elastic torsion bar, the joint between the input end of the steering transmission shaft and the input end of the steering gear is a sensor, and the sensor is a BI torque sensor capable of outputting a torque signal and a corner signal simultaneously. Although the power-assisted steering device with the structure can play a certain power-assisted role, the structure of the circulating ball type mechanical steering device cannot bear larger torque, so that the electric power-assisted steering device cannot transmit larger torque, can only be used on a small automobile and a light automobile, cannot be used on a large electric passenger car, a large new energy passenger car and a heavy automobile, and limits the application range of the electric power-assisted steering device.

Disclosure of Invention

The invention aims to provide an electric power-assisted automobile steering gear capable of outputting large torque.

The invention aims to realize the technical scheme that the electric power-assisted automobile steering device comprises a steering control system and a steering power-assisted system, wherein the steering power-assisted system comprises a motor, a cycloidal pin gear reducer assembly and a spiral bevel gear reducer assembly, the motor is connected with the spiral bevel gear reducer assembly through the cycloidal pin gear reducer assembly, and the steering control system is connected with the spiral bevel gear reducer assembly.

The spiral bevel gear reducer assembly comprises a steering gear shell assembly, a driving gear shaft assembly and a driven gear shaft assembly which are mutually meshed are arranged in the steering gear shell assembly, and the steering control system is meshed with the driven gear shaft assembly.

Further described, the drive gear shaft assembly includes a drive gear shaft with a bevel gear at one end; the driven gear shaft assembly comprises a driven gear shaft, and a driven gear and a steering worm gear are arranged on the driven gear shaft; the steering control system comprises a steering worm and a spline input shaft, one end of the spline input shaft penetrates into one end of the steering worm, a torsion bar with one end penetrating out of the spline input shaft and the penetrating end penetrating into the steering worm is arranged in the spline input shaft, and two ends of the torsion bar are respectively connected with the spline input shaft and the steering worm through two cylindrical pins; the bevel gear is meshed with the driven gear, and the steering worm is meshed with the steering worm wheel.

In order to shorten the length, the cycloidal pin wheel speed reducer assembly comprises an input shaft sleeve, a main body and a shell which are sequentially connected, an output pin disc is arranged in the shell, a spline connecting hole is formed in the center of the output pin disc, and one end of the driving gear shaft penetrates through the spline connecting hole to be connected with the output pin disc.

Because the invention adopts the technical scheme and adopts the motor as the input power, the invention is environment-friendly and reliable. The invention has the advantages of ingenious structural design and high use reliability, can obtain larger torque output, is suitable for large electric motor coaches, large new energy coaches and heavy automobiles, ensures that the steering is light and flexible, and can reduce the consumption of the use energy of a steering system.

Drawings

The drawings of the invention are illustrated as follows:

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a sectional view a-a of fig. 1.

Detailed Description

The following detailed description of the embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments will still fall within the scope of the present invention claimed in the claims.

Example 1: as shown in fig. 1, an electric power-assisted steering device for an automobile comprises a steering control system 2 and a steering power-assisted system, wherein the steering power-assisted system comprises an electric motor 1, a cycloidal pin gear reducer assembly 3 and a spiral bevel gear reducer assembly 4, the electric motor 1 is connected with the spiral bevel gear reducer assembly 4 through the cycloidal pin gear reducer assembly 3, and the steering control system is connected with the spiral bevel gear reducer assembly 4.

The spiral bevel gear reducer assembly 4 comprises a steering gear shell assembly 5, a driving gear shaft assembly and a driven gear shaft assembly which are mutually meshed are arranged in the steering gear shell assembly 5, and the steering control system is meshed with the driven gear assembly.

Further describing the connection relationship: the driving gear shaft assembly comprises a driving gear shaft 7 with a bevel gear 6 at one end; the driven gear shaft assembly comprises a driven gear shaft 8, and a driven gear 9 and a steering worm gear 10 are arranged on the driven gear shaft 8; the steering control system comprises a steering worm 11 and a spline input shaft 12, one end of the spline input shaft 12 penetrates into one end of the steering worm 11, a torsion bar 13 with one end penetrating out of the spline input shaft 12 and the penetrating end penetrating into the steering worm 11 is arranged in the spline input shaft 12, and two ends of the torsion bar 13 are respectively connected with the spline input shaft 12 and the steering worm 11 through two cylindrical pins 14; the bevel gear 6 is meshed with the driven gear 9, and the steering worm 11 is meshed with the steering worm wheel 10.

In order to shorten the length of the steering gear and save the installation space, the cycloidal pin gear reducer assembly 3 comprises an input shaft sleeve 15, a main body 16 and a shell 17 which are sequentially connected, an output pin disc 18 is arranged in the shell 17, a spline connecting hole 19 is arranged in the center of the output pin disc 18, and one end of the driving gear shaft 7 penetrates through the spline connecting hole 19 to be connected with the output pin disc 18.

The invention works as follows: when the steering control system 2 is turned, the spline input shaft 12 drives the steering worm 11 to rotate through the two cylindrical pins 14 and the torsion bar 13, and the steering worm 11 drives the steering worm wheel 10 to rotate. In this process, the sensor 20 disposed on the steering worm 11 transmits the information of the torque, the rotation angle and the rotation speed for driving the steering system 2 to rotate to the external controller of the electric power-assisted vehicle steering device, and the external controller instructs the electric motor 1 to operate in the corresponding rotation direction, the corresponding rotation angle, the corresponding rotation torque and the corresponding rotation speed. The motor 1 drives the main body part 16 of the cycloidal pin gear reducer assembly 4 to work through the input shaft sleeve 15 of the cycloidal pin gear reducer assembly 3, drives the driving gear shaft 7 of the spiral bevel gear reducer assembly 4 to rotate through the output pin disc 18, drives the driven gear 9, finally drives the steering output shaft to rotate, and achieves the power-assisted effect of the electric power-assisted automobile steering device.

In the invention, the motor and part of the components of the cycloidal pin gear reducer assembly 3 are all commercial products.

Claims

1. The utility model provides an electric power assisted automobile steering ware, includes steering control system (2) and steering power assisting system, characterized by: the power steering system comprises a motor (1), a cycloid pin gear reducer assembly (3) and a spiral bevel gear reducer assembly (4), wherein the motor (1) is connected with the spiral bevel gear reducer assembly (4) through the cycloid pin gear reducer assembly (3), and the power steering system (2) is connected with the spiral bevel gear reducer assembly (4); the spiral bevel gear reducer assembly (4) comprises a steering gear shell assembly (5), a driving gear shaft assembly and a driven gear shaft assembly which are meshed with each other are arranged in the steering gear shell assembly (5), and the steering control system (2) is meshed with the driven gear shaft assembly; the driving gear shaft assembly comprises a driving gear shaft (7) with a bevel gear (6) at one end; the driven gear shaft assembly comprises a driven gear shaft (8), and a driven gear (9) and a steering worm gear (10) are arranged on the driven gear shaft (8); the steering control system (2) comprises a steering worm (11) and a spline input shaft (12), one end of the spline input shaft (12) penetrates into one end of the steering worm (11), a torsion bar (13) with one end penetrating out of the spline input shaft (12) and the penetrating end penetrating into the steering worm (11) is arranged in the spline input shaft (12), and two ends of the torsion bar (13) are respectively connected with the spline input shaft (12) and the steering worm (11) through two cylindrical pins (14); the bevel gear (6) is meshed with the driven gear (9), and the steering worm (11) is meshed with the steering worm wheel (10); cycloid pin gear reduction unit (3) are including input axle sleeve (15), main part (16) and casing (17) that connect gradually be provided with output round pin dish (18) in casing (17) the center of output round pin dish (18) is provided with spline connecting hole (19), the one end of driving gear axle (7) penetrates spline connecting hole (19) and is connected with output round pin dish (18).