Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1982-09-14
1985-03-26
Hall, Carl E.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
291484A, 51289R, 51105SP, 5116591, 51291, 409132, 384450, B21H 112
Patent
active
045064229
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of producing bearing devices for the wheels of automobiles.
In bearing devices for the wheels of automobiles with which the present invention is concerned, the outer periphery of the outer joint member or shaft member with a flange (hereinafter referred to as shaft member) of a constant velocity 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 wheels of automobiles, however, the grinding operation on the shaft member and inner annular member is such that surfaces, such as the track surface, support surface, step section shoulder surface, step section cylindrical surface, and end surface contacting the step section shoulder, 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 predetermined tolerance, the accumulation of variations results in a large range of clearance in the assembled bearings, with some bearings having a smaller clearance than for the intended purpose of use and others having 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 correlation 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 influences of the outer peripheral track surfaces of the shaft 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 shaft members and inner annular members in advance and select a shaft member and an inner annular member as a pair which provides a given bearing clearance or negative 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 wheels of automobiles which is intended to eliminate the influences of the outer peripheral track surfaces of the shaft member and inner annular member on the bearing clearance.
To this end, the invention provides a method of producing bearing devices for the wheels of automobiles, which bearing devices comprise an outer member having two track surfaces formed on the inner periphery thereof, a shaft member having formed on the outer periphery thereof one track surface and a support surface for supporting the larger-end surfaces of conical rollers, and two rows of conical rollers disposed between the track surfaces of said outer member and said shaft member and inner annular member, said shaft member being formed with a step section cylindrical surface for receiving said inner annular member, said step section cylindrical surface having the inner annular member fitted thereon, with said inner annular member axially abutting against the shoulder surface of the step section, said method being characterized by the steps of grinding the track surface and step section cylindrical surface of said shaft memb
REFERENCES:
patent: 3806214 (1974-04-01), Keiser
patent: 4115958 (1978-09-01), Englander et al.
patent: 4177607 (1979-11-01), Toda
patent: 4274230 (1981-06-01), Thalheim
patent: 4454640 (1984-06-01), Egusa et al.
Burtch John T.
Hall Carl E.
NTN Toyo Bearing Company Limited
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