Metal deforming – By use of non-deforming work-gripping clamp and relatively... – Plural or complex apparatus
Patent
1980-08-02
1982-03-16
Gilden, Leon
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
Plural or complex apparatus
72302, B21D 7200
Patent
active
043194788
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a constant velocity joint for transmitting rotary motion from a driving shaft to a driven shaft at the same angular velocity. In particular, the invention is concerned with a method for manufacturing inner joint members of such constant velocity joint. The inner joint member has an outer spherical surface and is provided at circumferentially distributed positions in the peripheral surface with ball grooves each having arcuate groove bottom as viewed in axial section with the curvature center of the arcuate groove bottom being axially apart from the curvature center of the outer spherical surface of the inner joint member.
Generally speaking, in the constant velocity joint of the type wherein balls 3 are used as intermediary for torque transmission between driving shaft 1 and driven shaft 2 as shown in FIGS. 1 to 3, the balls 3 are to be at all times positioned in a plane bisecting the angle formed between the driving shaft 1 and the driven shaft 2 for maintaining the same angular velocity between these two shafts. It is well-known that to meet such a condition, the curvature center A of ball grooves 11 in the outer member 10 on the driving shaft 1 and the curvature center B of ball grooves 21 in the inner member 20 on the driven shaft 2 are to be on the opposite sides of and spaced by a same distance from the joint center O. In this occasion, a locus of the center C of the ball which rolls in the ball groove draws a curve whose centers of curvature lie on the points A and B. The center O also serves as the curvature center of the inner spherical surface 12 of the outer member 10, the outer spherical surface 22 of the inner member 20 and the inner and outer spherical surfaces of cage 4 disposed between the opposed spherical surfaces 12, 22. Therefore, the inner and outer members 10, 20 can get disaligned with each other about the center O with the cage 4 therebetween. In other words, the joint center O is at all times set at a fixed position by the cage 4.
This setting of the curvature centers A, B of the ball grooves 11 in the outer member 10 and the ball grooves 21 in the inner member 20 maintains equality between the distances (offset) from the center O of joint to the points A and B respectively and between the distances from the center C of the ball to the points A and B respectively. Therefore, .DELTA.OAC is congruent with .DELTA.OBC because of equal lengths of the respective three sides, leading to equality in distances L.sub.1 and L.sub.2 from the center C of the ball to the axes of the both shafts respectively. As a result, the balls 3 are always controlled to be in a plane bisecting an angle formed between the shafts 1 and 2. This is also applicable to the other balls such as those which are not in the plane of the drawing sheet on which FIG. 3 appears. In this matter, the constant velocity on the both shafts can be assured even when disaligned in this type of constant velocity joint.
The aforedescribed special design applied to the inner and outer joint members of this kind of constant velocity joint naturally results in extra machining hours as well as in a reduction in the yield rate of material if they are manufactured by milling work or the like only, and it has been previously indispensable to adopt a special machining process.
Conventionally used for the manufacture of the inner joint member 20 is, for example, a pair of mating split mold-halves 5, 6 as shown in FIG. 4; which allows to simultaneously form peripheral surface 22 and ball grooves 21 through one forming action, thus saving working hours. However, technical requirements for the removal of the upper mold-half 5 prior to discharging a formed inner member 20 with the bottom mold-half 6 fixed as well as for effecting simultaneous motions of the upper and lower punches 7, 8 for forming operation require a pressing machine equipped with at least three sliding mechanisms, which is costly and complicated in construction. In addition, such split-mold frequently and inherently used to accompany inaccurate
REFERENCES:
patent: 2930483 (1960-03-01), Karl
patent: 3036366 (1962-05-01), Ricks
patent: 3124876 (1964-03-01), Putelli
patent: 3186209 (1965-06-01), Friedman
patent: 4048715 (1978-03-01), Koch et al.
Gilden Leon
NTN Toyo Bearing Company Ltd.
LandOfFree
Method for manufacturing an inner joint member of constant veloc does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for manufacturing an inner joint member of constant veloc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for manufacturing an inner joint member of constant veloc will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1636999