Drive assembly for stairs climbing wheelchair and pinion and rack set thereof

Abstract

The invention provides a transmission component for stairs climbing wheelchairs, as well as a gear and rack set thereof. The invention belongs to a transmission component for stairs climbing equipment, and particularly applies to a wheelchair transmission component moving in a straight line along an inclined track and in a curve along a steering track. The transmission component for stairs climbing wheelchairs comprises a transmission gear and a transmission rack, wherein the transmission rack is arranged on a track which can be fixed with stairs, and the gear is arranged on a fixed box capable of installing the wheelchair through a main transmission shaft and mutually meshes with the transmission rack on the track. In the gear and rack set, the gear consists of a roller wheel and movable teeth arranged on the roller wheel, and the movable teeth consist of a mandrel fixedly arranged on the roller wheel and a toothed sleeve which is sleeved on the mandrel and can rotate around the mandrel. The transmission component can effectively improve the steadiness degree of wheelchair transmission operation and the safety of the stairs climbing wheelchairs.

Description

technical field [0001] The invention belongs to a transmission component of stair climbing equipment, in particular to a wheelchair transmission assembly suitable for running straight along an inclined track and running along a curved track. Background technique [0002] Known technology, such as the published Chinese patent 200510010262.7, can realize the gear and rack mechanism of curved transmission. It relates to a gear and rack transmission pair. It solves the problem that the rack in the traditional gear and rack transmission pair can only extend in a straight line and cannot be bent. It consists of a gear body and a rack body. The gear body is composed of a wheel disc and several teeth. The diameter of the outer end of the "column"-shaped tooth is smaller than the diameter of the root end, and the end surface of the root end of the tooth is fixed on the wheel disc. On the circumferential surface and the gear teeth are perpendicular to the circumferential surface of ...

AI Technical Summary

Problems solved by technology

[0005] The known transmission mechanism for positioning and conveying in three-dimensional space generally requires the combination of two or more plane conveying devices to achieve the purpose of transmission. Therefore, the equipment structure is complicated, the power consumption is large, and the manufacturing cost is high. It has always been a difficult problem to be solved in the industry.

[0006] In particular, the gear and rack structure in the known transmission mechanism cannot adapt to the transmission of the stair climbing wheelchair. When the wheelchair runs along the curve of the steering track or encounters a small obstacle, the wheelchair will always have the problem of not being able to parallel smoothly. Therefore directly affect the safety of wheelchair users

The researchers found that this is mainly due to the fact that the known gear and rack structure theoretically operates as a surface contact during the transmission process, which causes the problem of conflict between the gear and the rack, which directly affects the stability of the transmission mechanism

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