Method of producing bearing devices for driving wheels of automo

Details Method of producing bearing devices for driving wheels of automo Method of producing bearing devices for driving wheels of automo

1982-09-13

1984-06-19

Rosenbaum, Mark

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

291495R, 291484R, B21D 5310

Patent

active

044546408

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a method of producing bearing devices for driving wheels of automobiles.
In bearing devices for the driving wheels of automobiles with which the present invention is concerned, the outer periphery of the outer race of the outer joint member of a constant velocity universal joint serves as one of the inner members of the bearing. In such bearing devices, bearing clearance values have major influences on the life of the bearing and on the driving comfortableness of the automobile, so that severity is imposed on said bearing clearance values.
According to conventional methods of producing bearing devices for the driving wheels of automobiles, however, the grinding operation on the outer joint member and inner annular member is such that surfaces, such as the track surface, step section shoulder surface, step section cylindrical surface, and end surface contacting the step section shoulder surface, are separately ground by separate grinding stones within respective predetermined target tolerances. As a result, despite the fact that each surface is finished within its tolerance, the accumulation of variations results in a large range of clearance in the assembled bearings, with some bearings having a smaller clearance value than for the intended purpose of use and others a larger one. Thus, if bearings having a smaller clearance value than for the intended purpose of use are assembled into an automobile, this will result in seizure and premature peeling, decreasing the life of the bearing. Conversely, if the value of the bearing clearance is too large, this will result in rattling or vibration, which is undesirable. Further, since the grinding operation is not such that the corelation between the amounts of deviation of the finish dimension of the respective surfaces is constant, variations in the bearing clearance are produced, making it impossible to control clearances to bring them within a given range.
To eliminate the influence of the outer peripheral track surfaces of the outer joint member and inner annular member on the bearing clearance,the conventional production method may be effective to suppress the amount of variation by narrowing the tolerance, but narrowing the tolerance requires severe machining, which lowers productivity and increases the cost of production.
Therefore, in the conventional assembling operation, it has been necessary to prepare numbers of outer joint members and inner annular members in advance and select an outer joint member and an inner annular member as a pair which provides a given bearing clearance or negative bearing clearance each time a bearing is assembled, thus greatly detracting from bearing assembling efficiency and interchangeability.
In view of the above-described drawbacks to the conventional production method, the present invention provides a method of producing bearing devices for the driving wheels of automobiles which is intended to eliminate the influences of the outer peripheral track surfaces of the outer joint member and inner annular member on the bearing clearance.
To this end, the invention provides a method of producing bearing devices for the driving wheels of automobiles, which bearing devices comprise an outer member having two rows of track surfaces formed on the inner periphery thereof, the outer joint member of a constant velocity universal joint having one track surface formed on the outer periphery thereof, an inner annular member having the other track surface formed on the outer periphery thereof, and two rows of rolling bodies interposed between the track surfaces of said outer member, outer joint member, and inner annular member, said outer joint member being formed with a step section cylindrical surface for receiving said inner annular member thereon, said step section cylindrical surface having said inner annular member fitted thereon, with said inner annular member axially abutting against the shoulder surface of the step section, said method being characterised by the steps of grinding said track surface of t

REFERENCES:
patent: 1027542 (1912-05-01), Hess
patent: 1178526 (1916-04-01), Laycock
patent: 3192002 (1965-06-01), Carter, Jr.
patent: 3824658 (1974-07-01), Donahue et al.

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