Transmission device for automobile seat adjustor

Abstract

The invention provides a transmission device for an automobile seat adjustor. The transmission device for the automobile seat adjustor comprises a screw rod, a worm wheel, a worm, an output bearing, an input bearing and a housing, wherein the worm wheel is arranged on the screw rod in a sleeving way; the worm rod drives the worm wheel to rotate; the output bearing is arranged at the two ends of the worm wheel; the input bearing is arranged at the two ends of the worm; the housing is used for fixing and bearing the input bearing and the output bearing. The worm wheel is provided with an internal thread matched with the screw rod, so that the worm wheel can perform reciprocating motion along the screw rod during rotation. The transmission device also comprises a guide bearing which is arranged at the periphery of the screw rod in a sleeving way and fixed with the housing; the guide bearing, the output bearing and the worm wheel are arranged at intervals in the axial direction. Due to the adoption of the transmission device, friction vibration between the guide bearing and the screw rod is prevented from being transmitted to the worm wheel, so that inclined cooperation of the worm wheel and the screw rod, noise generation and abrasion enhancement are avoided; the structure strength of the guide bearing can be improved, and corresponding forming materials are convenient to select to meet the supporting requirement of the worm wheel and the guide requirement of the screw rod respectively.

Description

technical field [0001] The invention relates to the technical field of auto parts, in particular to a transmission device for an auto seat adjuster. Background technique [0002] Traditional car seats mostly use manual methods to adjust the front and rear position of the seat, which is inconvenient to operate. In recent years, more and more automotive products have begun to adopt electric seat adjustment devices to improve user experience. A car seat adjuster has also been disclosed in the industry, which has a screw, a reciprocating worm sheathed on the screw, and a worm that drives the worm to rotate. Chinese patent CN100443776 C discloses a transmission mechanism for an adjustment device, which includes a bearing sleeve matched with a screw nut, and the bearing sleeve has a supporting section and a guiding section. The guide section optimizes the coaxiality between the screw rod and the screw nut when the screw nut is adjusted and operated, and then achieves harmonious ...

AI Technical Summary

Problems solved by technology

[0003] However, the support section and the guide section are the same part that is integrally formed. During the transmission process, the screw rod and the guide section continuously rub against each other and generate a radial force on the impact. The force is directly transmitted to the support section, thereby making the The bearing sleeve produces overall deflection and vibration, and the noise becomes larger

In addition, since the above-mentioned guide section is set as an axially extending cantilever structure, the guiding strength for the screw rod is insufficient, which may cause the screw rod and the worm wheel to be obliquely matched, resulting in vibration and increased noise

On the other hand, the guide section has higher requirements on the wear resistance of the material, while the support section has higher requirements on the lubricity of the material. The material selection of the existing bearing sleeve must balance the above two requirements, and the wear resistance of the guide section will be insufficient and excessive. Early wear, resulting in increased noise and shortened life

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