CN-115571216-B - Method for adjusting rocker shaft clearance of power steering gear by eccentric bearing

CN115571216BCN 115571216 BCN115571216 BCN 115571216BCN-115571216-B

Abstract

The invention provides a method for adjusting the gap of a rocker shaft of a power steering gear by using an eccentric bearing, which is characterized in that a mark hole with the eccentric value e at the maximum position and two wrench adjusting circular arc grooves are arranged on the end face of the eccentric bearing, so that the radial gap of the rocker shaft of the power steering gear can be conveniently adjusted by using a wrench. The eccentric bearing wrench is easy to clamp, the claw of the wrench is not easy to break, the assembly and adjustment are convenient, the axial gap is eliminated by adopting a mode of applying axial thrust, and then the second clamping spring with proper thickness is selected for installation, so that the axial gap of the rocker shaft is ensured to be within a normal tolerance range, and the service life of the power steering gear is prolonged.

Inventors

CHEN YANGBIN
LI QUNHUI
DU QIONG

Assignees

东科克诺尔商用车制动技术有限公司

Dates

Publication Date: 20260512
Application Date: 20220930

Claims (3)

1. The method for adjusting the rocker shaft clearance of the power steering gear by using the eccentric bearing is characterized by comprising the following steps of: 1) Improvements to eccentric bearings The end face of the eccentric bearing is provided with a mark hole with the eccentric value e at the maximum position, the end face of the eccentric bearing is provided with two wrench adjusting circular arc grooves, the two wrench adjusting circular arc grooves are arranged in a central symmetry manner, and the outer sides of the wrench adjusting circular arc grooves are open; 2) Radial clearance adjustment for rocker shaft of power steering gear The wrench is clamped in a wrench adjusting arc groove of the eccentric bearing, the inner ring is rotated to be adjusted, the circle center of the inner ring of the eccentric bearing moves upwards, after the eccentric amount is adjusted according to the requirement, the outer side edges of the 2 eccentric bearings are punched, riveted and loose-proof, and the radial gap of the rocker shaft (9) is ensured in an assembled state; 3) Axial clearance adjustment for a power steering rocker shaft The method comprises the steps of firstly installing a first check ring, a first eccentric bearing, a sealing ring on an inner hole of the eccentric bearing, a first O-shaped ring and a first clamping spring on the outer circle of the eccentric bearing on the end A of the power steering device, then installing a second check ring, a second eccentric bearing, a sealing ring on an inner hole of the second eccentric bearing and a second O-shaped ring on the outer circle of the second eccentric bearing on the end B of the power steering device, then applying an axial thrust on the outer end of the second eccentric bearing, eliminating axial gaps among all parts which are assembled, measuring the axial gaps between the second eccentric bearing on the end B and the outer side of a clamping spring groove on a shell, and selecting a second clamping spring with proper thickness according to the axial gaps for installation, thereby ensuring the axial gaps of the rocking arm shaft.
2. The method for adjusting the clearance of a rocker shaft of a power steering gear by using an eccentric bearing according to claim 1, wherein the diameter of the mark hole at the maximum position of the eccentric amount e is not more than 6 mm, and the diameter of the key adjusting circular arc groove is not less than 8 mm.
3. The method of adjusting a power steering rocker shaft lash with an eccentric bearing of claim 1, wherein the power steering rocker shaft radial lash adjustment is adjusted after the eccentric bearing is assembled.

Description

Method for adjusting rocker shaft clearance of power steering gear by eccentric bearing Technical Field The invention belongs to the technical field of manufacturing of automobile power steering gears, and relates to a method for adjusting a rocker shaft clearance of an automobile power steering gear by using an eccentric bearing. Background The recirculating ball power steering gear has high reliability and long service life due to larger output torque and rotation angle, and is widely applied to commercial vehicles, wherein the adoption of an eccentric bearing to adjust the clearance of a rocker shaft is a common mode. The working principle of adjusting the clearance of a rocker shaft by using an eccentric bearing in the prior art is described with reference to fig. 1 to 4: 1) Radial clearance adjustment for rocker shaft The gear kinematic pair of the recirculating ball power steering gear is made up of rocker arm shaft 10 and rack piston along the straight tooth of equal thickness of tooth width (straight tooth of equal thickness), its radial clearance of rocker arm shaft is realized through adjusting the eccentric bearing 3 of both ends synchronously, eccentric bearing 3 see figure 2, eccentric bearing's outer lane and inner race are not concentric, there is an eccentric amount e; As shown in figure 1, the currently common spanner adjusting holes of the eccentric bearing are 2 holes with different diameters, the number of the holes is 3-1, the number of the small holes is 3-2, the number of the large holes is 3-1, and the position with the largest eccentric value e is marked at the same time; 2) Axial lash adjustment for rocker shafts As shown in fig. 2 and 3, the axial position of the eccentric bearing 3 is positioned by the first clamping spring 1 and the second clamping spring 10 which are installed on the shell 11, during the assembly process, the first clamping spring 1 at the end a is assembled firstly, the second clamping spring 10 at the end B is assembled afterwards, the axial clearance tolerance between the second clamping spring 10 which is finally formed and the outer side of the clamping spring groove of the shell 12 is very large, the tolerance accumulation of the axial clearance consists of the thickness tolerance of the first clamping spring 1 and the second clamping spring 10, the width tolerance of the eccentric bearing 3, the thickness tolerance of the first blocking piece 4 at the end a and the second blocking piece 6 at the end B, the distance tolerance of the outer sides of the two clamping spring grooves of the shell 12 and the width tolerance of the rocker arm shaft, and when the axial clearance is too large, the problems and the disadvantages exist: The eccentric bearing 3 moves back and forth in the axial direction, so that the first O-shaped ring 5 and the second O-shaped ring 8 of the outer circle sealing piece of the eccentric bearing are worn and damaged, and oil leakage is caused; the eccentric bearing 3 moves back and forth in the axial direction, so that the first clamp spring 1 and the second clamp spring 10 can rotate circumferentially, the circumferential mounting positioning flange 2-1 of the first dust-proof oil seal 2 (see fig. 4) and the second dust-proof oil seal 9 is extruded, and the first dust-proof oil seal 2 and the second dust-proof oil seal 99 fail; The eccentric bearing 3 reciprocates in the axial direction, and particularly receives larger lateral force on the rocker shaft, so that the punching rivet anti-loosening point of the eccentric bearing is invalid, the gear kinematic pair is meshed unevenly, abnormal sound and abrasion of the gear kinematic pair are caused, and the service life of the power steering gear is reduced. Disclosure of Invention In order to solve the problems that in the prior art, the radial clearance adjustment of a rocker shaft is difficult to adjust by a spanner and the clamping jaws of the spanner are easy to break, and the axial clearance of the rocker shaft is overlarge in the prior art, the invention provides a method for adjusting the clearance of the rocker shaft of a power steering gear by using an eccentric bearing. The technical scheme of the invention is that the method for adjusting the clearance of the rocker shaft of the power steering gear by using the eccentric bearing comprises the following steps: 1) Improvements to eccentric bearings The end face of the eccentric bearing is provided with a mark hole with the eccentric value e at the maximum position, the end face of the eccentric bearing is provided with two wrench adjusting circular arc grooves, the two wrench adjusting circular arc grooves are arranged in a central symmetry manner, and the outer sides of the wrench adjusting circular arc grooves are open; 2) Radial clearance adjustment for rocker shaft of power steering gear The wrench is clamped in a wrench adjusting arc groove of the eccentric bearing, the inner ring is rotated to be adjusted, the circle cent