Low-noise self-compensating worm wheel and worm clearance adjustment device

Abstract

The invention relates to a low-noise self-compensating worm wheel and worm clearance adjustment device. Different materials are selected through a bearing sleeve and a bearing, cross-frequency decoupling suppression is adopted, vibration transmitted by road bump or abnormal sound caused by resonance is effectively reduced; in the worm gear and worm meshing process, even if the center distance deviation is caused in the shell processing process, under pre-tightening force provided by a waved compression spring, pre-compression is provided in the direction of the worm wheel and worm meshing center distance, the worm wheel and worm meshing clearance is reduced, and then the abnormal sound can be avoided. After a worm gear and a worm wear due to long-time use, the meshing clearance can be compensated automatically by the waved compression spring, and the noise generated by clamping between teeth during meshing of the worm gear and the worm is reduced.

Description

technical field [0001] The invention relates to a gap adjustment device, in particular to a low-noise self-compensating worm gear gap adjustment device. Background technique [0002] The column-type electric power steering system often uses a worm gear structure. Considering the smoothness of the transmission and the need to store grease, there must be a certain meshing gap between the worm gear and the worm. In order to prevent the steering column from being transmitted from the steering rack In order to avoid the abnormal noise that may be generated by the excitation of the coming road surface, it is necessary to strictly control the meshing clearance between the worm gear and the worm. [0003] In the prior art: the assembly of the worm in the housing usually designs a special elastomer bushing inside the deep groove ball bearings at both ends of the worm, and the other side of the bush is positioned by the steps of the worm respectively, and an axial force is applied to ...

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Problems solved by technology

[0004] Although this solution greatly reduces the axial movement of the worm and the tooth gap of the worm gear, it puts forward high requirements on the processing capacity of the fixed worm gear shell, and the worm gear requires a matching center during the machining process. There is often a deviation in the center distance of the shell formed after the processing process. The existence of this deviation leads to a clearance gap between the worm gear and worm. If the deviation is positive, it will cause abnormal noise, and if the deviation is negative, it will cause the no-load torque to exceed the standard. At the same time After the shell is machined, the theoretical meshing center of the worm gear and worm is not in the axial direction of the shell and does not coincide, which will also lead to the above problems. Therefore, the current design cannot effectively compensate for the radial deviation of the worm gear and worm due to the deviation of the shell machining center distance and the Avoidance of the failure mode of abnormal noise caused by the wear of the worm gear itself

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