JPS59192402A - Machining method of yoke for drive shaft - Google Patents

Abstract

PURPOSE:To reduce the time required for preparatory steps and the number of fixtures available as well as to machine the yoke in an efficient manner, by setting the yoke having several work parts subject to metalcutting such as boring, planing and grooving or the like to a machine tool, while machining these several work parts without removing the yoke. CONSTITUTION:A jig 6 is fitted in a shaft hole 7 of a yoke 1 which is attached to a face plate of a lathe turning machine by using fixtures. And, the yoke 1 is made to rotate around an axis 8 of the shaft hole of a cross spider whereby a shaft hole part 2, a plane surface 3 and each of groove parts 4 and 5 required for setting a snap spring are all machined. At this time, it is important to know that if the yoke is once set up to the lathe turning machine, machining should be continued to take place to the last without dismantlement, never. Therefore, a lot of jigs and fixtures become useless so that not only the time required for preparatory steps can be reduced but also accuracy among work parts can be improved in addition.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of machining a yoke for a drive shaft.

Drive shaft yokes are often used to drive automobiles, construction machinery, and agricultural machinery.

The cross spider bearing portion of the yoke has conventionally been processed, for example, as follows.

(1) Using a precision boring machine, fix the yoke 1, which is a forged or cast workpiece, and rotate the tool to machine part 2 of the shaft hole of the cross spider (Fig. 1).

(2) Next, remove the yoke from the precision boring machine, attach it to the table of a milling machine, and mill the plane 3 of the yoke to which the thrust of the cross spider is applied (Figure 2).

(8) Next, remove the yoke from the milling machine, attach it to a dedicated snap ring grooving machine, and process the groove portions 4 and 5 for attaching the snap ring (Fig. 8).

In this way, when processing the yoke, we installed the yoke on eight types of machines just for the shaft hole of the cross spider.
It was necessary to remove it, which not only required a support but also required a long setup time. Furthermore, since the machine is attached to and detached from the machine, there is a drawback that the machining accuracy of each machined surface is reduced.

The purpose of the present invention is to eliminate the drawbacks of the conventional machining method, reduce the setup time, reduce the number of shafts, and provide a method for efficiently machining a yoke. Figure 4 shows the method of the present invention. An example is shown. In this example, the jig 6 is fitted into the shaft hole 7 of the yoke 1, and the yoke 1 is attached to the face plate of the lathe using a yato. As the lathe, it is preferable to use, for example, a numerically controlled lathe (NO lathe) in which machining is programmed.

The yoke attached to the face plate of the lathe is rotated around the axis 8 of the shaft hole of the cross spider, and the 2 part of the shaft hole, the flat surface 3, and the groove parts 4 and 5 for attaching the snap ring are machined. . In this case, once the yoke is installed on the lathe,
Process without removing until the end. Therefore, it is possible to reduce the setup time without requiring a large number of jigs and tools, and to improve the accuracy between the machining parts.

As mentioned above, when processing the yoke of a drive shaft, the present invention performs a series of processing without removing the yoke once it is attached to the machine tool, thereby reducing the number of jigs and yatos, reducing setup time, and ultimately improving the quality of the product. This has the great practical effect of reducing the price of the product.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the yoke showing the part to be machined with a precision boring machine using the conventional method. Figure 2 is a cross-sectional view of the yoke showing the part to be machined using a milling machine using the conventional method. Figure 3 is the conventional method. FIG. 4 is a cross-sectional view of the yoke showing the portion to be machined with a dedicated snap ring groove cutting machine, and FIG. 4 is a cross-sectional view of the yoke illustrating the implementation of the method of the present invention. 1...Yoke 2.8.4.5...Processed part 6...Jig 7...Shaft hole 8...Axis line. Figure 1 Figure 2 (4) Figure 3 Figure 4 33@4

Claims (1)

[Claims] 1. A yoke having several machining parts such as boring, surface cutting, and grooving is attached to a machine tool, and the several machining parts are machined without removing the yoke. How to process a yoke for a drive shaft. The machining method according to claim 1, wherein the machining method is carried out by rotating the yoke with the machine tool.