Self-centering timing disk hub and method of mounting the same

Abstract

The invention relates to a self-centering timing disk hub with a timing disk support surface and a tubular hub sleeve, wherein the end of the hub sleeve can be pushed onto a motor shaft so as to provide in the hub sleeve a contact surface between the inner wall surface of the hub sleeve and the motor shaft. The outer wall surface of the hub sleeve has an at least approximately conical form, wherein the cone angle opens from the sleeve end to the timing disk support surface. The hub sleeve is slotted at least in the region of the motor shaft and a clamping element is movably arranged on the outer wall surface at the sleeve end. The invention also relates to a method for mounting a self-centering timing disk hub on a shaft, in particular a motor shaft of an encoder.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a self-centering timing disk hub with a timing disk support surface (1a) and a tubular hub sleeve (1b) and to a method for mounting the same on a motor shaft.[0003] 2. Description of the Related Art[0004] Self-centering timing disks of the afore described type are known from DE 196 41 929 A1 (RUHLATEC Industrieprodukte GmbH). The timing disk hub described therein is installed in an encoder which is connected with a motor by a simple rotational motion.[0005] Sufficient clearance should be provided for centering the timing disk hub on the motor shaft during installation. For this reason, the end of the timing disk hub facing the motor has a pilot bore for aligning the vertical axes of the shaft and the timing disk. With current state-of-the-art devices, a distortion tended to occur when the shaft is inserted into the timing disk hub, since the hub which is pushed onto the finish-machined shaft, has a reduced diame...

AI Technical Summary

Problems solved by technology

With current state-of-the-art devices, a distortion tended to occur when the shaft is inserted into the timing disk hub, since the hub which is pushed onto the finish-machined shaft, has a reduced diameter.

The stringent requirements on the surface quality of the motor shaft and the timing disk hub as well as the tight manufacturing tolerances create a cost pressure in mass production.

It is also difficult to maintain the required tolerances in production.

A slight displacement of the timing disk relative to the motor shaft can adversely affect the operation of, for example, servo motors.

Since during installation this does not produce a press-fit, only a relatively small force is required.

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