Worm wheel self-locking type single-degree-of-freedom prosthetic hand

Abstract

The invention discloses a worm wheel self-locking type single-degree-of-freedom prosthetic hand. The prosthetic hand is composed of threestage mechanical transmission and a four-bar mechanism; the first stage mechanical transmission adopts three spur gears, the second spur gear is an idle gear, the second stage mechanical transmission adopts worm and worm wheel transmission, and the third stage mechanical transmission adopts two spur gears; a worm and a worm wheel are in intermediate transmission, large stress and high rotation speed of the worm wheel are avoided, and abrasion of the worm wheel is effectively reduced;a driving motor is arranged in a rack cavity, and the axis of the driving motor is perpendicular to the axis of motion of an index finger rod, the size of the prosthetic handis reduced, and especially the size of the wrist joint is reduced; the single-degree-of-freedom prosthetic hand adopts few mechanical parts, the structure is simple, the weight is light, and mechanical self-locking is reliable.

Description

Technical field [0001] The invention belongs to the field of medical rehabilitation equipment, and particularly relates to a worm gear self-locking single free vacation limb hand. Background technique [0002] The prosthetic hand is installed on the residual limb of the disabled to realize some functions of the human hand. In recent years, there have been many patent documents for multi-freedom vacation limbs, and few inventions on single-freedom vacation limbs. However, single-freedom vacation limbs are still current due to their simple structure, low price, and high clamping force. Mainstream products in the market. In the application, almost all adopt OttoBock's single free vacation limb hand structure. This kind of prosthetic hand is driven by a DC motor and drives the thumb and the opposite index finger for clamping movement through three-stage deceleration. Among them, the first-stage reduction adopts a friction type planetary reducer. The planetary gears are replaced by...

AI Technical Summary

Problems solved by technology

[0004] (1) Due to the small surface area of ​​the outer peripheral surface of the paddle, the friction torque between it and the brake ring is also small, and the self-locking function is poor, and the phenomenon of loose fingers and drooping objects often occurs

[0005] (2) Due to the relative radial movement of the paddle and the brake ring to achieve frictional braking and exit the braking state, there is often vibration when the finger moves

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