JPH0140337Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a cross shaft body used as a joint element of a universal joint.

BACKGROUND OF THE INVENTION A cross shaft body used as a joint element of a universal joint has a body portion in which the intersection of two shafts is formed thicker, as described in Japanese Patent Publication No. 47-16681, for example. The cross shaft body 1 is formed by stamping and forging a metal material, and then each shaft portion 12, 1 is formed as shown in FIG.
3, 14, and 15 are turned using a turning machine. That is, the V-groove blocks 25, 2 are provided on the spindle head 24.
5 in a symmetrical position with respect to the chuck 26, press each shaft portion 12, 13 of the cross shaft body 1 against the V-groove blocks 25, 25 as shown, and chuck one shaft portion 14 with the collector chuck 26. One shaft portion 25 is cut to a predetermined size using a cutting tool 27. The other shaft portions 12, 13, and 14 are shaved one shaft at a time by repeating the above procedure.

Problems to be Solved by the Present Invention In the conventional cross shaft, one of the four shafts is chucked and one shaft is shaved, so the concentricity of the X-Y axes of the cross shaft is limited. There were problems with variations in accuracy and a long turning time.

Means for solving the problem According to the present invention, the above problem can be solved by two axes 2,
Two or more grooves 9 are formed in the side walls 7, 8 of the conical recesses 5, 6 formed at the center of the axis intersection on the front and rear surfaces of the body 4, which form the intersections of the recesses 5, 3, respectively.
This problem can be solved by forming the bottom part 11 from the periphery 10 of the part 6.

Action Clamps 18 and 19, which have protrusions 17 formed on the conical end surface 16 that fit into the grooves 9, are inserted into the respective recesses 5 and 6 of the body section 4 on both sides without chucking the shaft sections 12, 13, 14, and 15. Two shank portions that are tightly fitted and on a straight line are simultaneously turned, and then two shank portions that are on the other straight line are simultaneously turned.

Example An example of the present invention will be described. In Fig. 1, reference numeral 1 denotes a cross-shaft body used as a joint element of a universal joint, and the central part of the axis intersection on the front and back side of the body 4, which forms the intersection of the two shafts 2 and 3 arranged at right angles, is Conical recesses 5 and 6 are formed, respectively, and two or more grooves 9 are formed in the side walls 7 and 8 of the conical recesses 5 and 6, respectively, from the periphery 10 of the recesses 5 and 6 toward the bottom 11. There is.

Each recess 5, 6 and each groove 9 of the cross shaft body 1 are
When the cross shaft body 1 is die-forged from a metal material, it is simultaneously formed by a die.

As shown in FIG. 2, the cross shaft body 1 is a clamp in which the shaft portions 12, 13, 14, and 15 are not chucked, and a protrusion portion 17 is formed on the conical end surface 16 to fit into each of the grooves 9. 18 and 19 are fitted and held from both sides into the respective recesses 5 and 6 of the body 4, and the two shaft parts 12 and 1 are aligned in a straight line as shown in FIG.
3 are simultaneously cut by the cutting tools 20 and 21, and when the turning is completed, the cutting tools 20 and 21 move back, and then the cutting tools 22 and 23 move forward to cut the two shaft portions 14 and 15 on the other straight line.

For the above turning, four machines are arranged in the X-Y direction,
This is a method of cutting two shaft parts at the same time, but four machine bits 20, 21,
22 and 23 at the same time to move the four shaft parts 12 and 1
You can also cut 3, 14, and 15 at the same time, and
- Two machines are arranged in one axis direction in the Y direction, and the cross shaft body 1 is held with clamps 18 and 19.
It is also possible to cut one shaft part at a time.

Effects of the invention According to the configuration of the invention, when turning each shaft part of the cross shaft body 1, the shaft parts are not chucked as in the conventional case.
Fit the clamp to the body of the cross shaft body from both sides,
By fitting the groove of the concave part of the body with the protrusion of the clamp, the cross shaft can be reliably positioned with respect to the turning position.
It is now possible to cut two shafts at the same time, significantly reducing turning time. Furthermore, simultaneous turning of two or four shaft portions of the cross shaft improves the accuracy of coaxiality of the cross shaft compared to conventional cross shafts.

[Brief explanation of the drawing]

FIG. 1A is a front view of the embodiment of the present invention, FIG. 1B is a side view of the embodiment of the present invention, and FIGS.
The figure shows the turning process of the cross shaft body, and FIG. 4 is a diagram showing the turning state of the conventional cross shaft body. 1...Cross shaft body, 2, 3...Shaft part, 4...Body part, 5, 6...Recessed part, 7, 8...Side wall, 9...
groove.

Claims (1)

[Scope of utility model registration request] A recess is formed at the center of the axis intersection on the front and back surfaces of the body, which form the intersection of the two shafts, and two or more grooves are provided in the side walls of each recess from the periphery of the recess toward the bottom. Cross shaft body for universal joints.