Geneva mechanism

Abstract

The invention discloses a geneva mechanism which comprises a poking disc, serving as a driving part, and a geneva, matched with the poking disc and serving as a driven part, wherein the poking disc is composed of a poking plate and at least two poking pins which are vertically arranged on the poking plate and uniformly arranged surrounding the center of the poking disc; distances from the centers of the poking pins to the center of the poking disc are the same; the geneva is composed of a rotary disc surface; at least three radial transmission grooves are uniformly formed in the rotary disc surface in the radial direction; and the poking disc rotates around the center to drive the poking pins to be connected in the corresponding transmission grooves in a clamping manner and drive the geneva to rotate around the center. The geneva mechanism has the remarkable effects that limitation of the poking pins to movement of the geneva can be ensured to be reliable at any time, the poking pins are insensitive in fit clearance and can reliably run in places with large torques and high-speed transmission, and the application range of the poking pins is enlarged; and in addition, geneva concave arc holes and convex arc plates further optimize the movement characteristics of the geneva, so that acceleration mutation and soft impact are avoided, and vibration and noise are dramatically lowered.

Description

technical field [0001] The invention relates to a sheave mechanism, in particular to a sheave mechanism capable of avoiding abrupt acceleration changes and flexible impacts, and belongs to the technical field of machinery. Background technique [0002] The geneva mechanism is a one-way intermittent motion mechanism composed of a grooved wheel and a cylindrical pin, also known as the Maltese mechanism. It is often used to convert the continuous rotation of the active part into a one-way periodic rotation with pauses of the driven part. Chinese patent 2014202612934 discloses a sheave mechanism, although the sheave mechanism can maintain the stability of the sheave rotation, avoid the problem of the sheave swing, make the dial accurately dial into the dial groove on the sheave, and prolong the service life life. However, when the pin enters or leaves the transmission groove (radial groove), the locking arc of the sheave mechanism is unreliable in one direction, and its matchi...

AI Technical Summary

Problems solved by technology

However, when the pin enters or leaves the transmission groove (radial groove), the locking arc of the sheave mechanism is unreliable in one direction, and its matching gap has the characteristic of lever amplification, which is not suitable for large torque and high-speed transmission occasions. , which limits its application range; when the pin enters or leaves the transmission groove (radial groove), there is an insurmountable sudden change in the acceleration, resulting in a flexible impact, which brings greater vibration and noise

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