Abrasive tool making process – material – or composition – Impregnating or coating an abrasive tool
Patent
1982-08-09
1986-06-03
Schmidt, Frederick R.
Abrasive tool making process, material, or composition
Impregnating or coating an abrasive tool
51 3, B24B 4904
Patent
active
045921725
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of machining the inner rings of tapered roller bearings. More particularly, it relates to a method of machining the inner rings of double row tapered roller bearings or tapered roller bearings used in a double row, such as back-to-back duplex tapered roller bearings, and particularly to a method of machining tapered roller bearing inner rings in such a manner as to ensure that the dimension from the outer ring back face (small end face) to the inner ring front face (small end face), i.e., the plane difference, and the bearing assembly clearance (axial clearance) due to that plane difference are constant.
This assembly clearance refers to such a dimension that when two inner ring assemblies (comprising an inner ring, a retainer, and rollers) are combined for manufacture (assembly), e.g., of a double row tapered roller bearing and the front faces of the inner rings are butted against each other by a predetermined force, the outer ring is allowed to move axially under a predetermined measuring load. The assembly clearance, when bearings are assembled into a machine (e.g., on automobile axles), determines the running clearance and hence it is closely related to seizure, premature peeling, etc., greatly influencing the bearing life; thus it is one of the important conditions for bearing assembly.
Generally, the assembly clearance (axial clearance) of this type of bearing is determined by the plane difference of the bearing assembly. Of the dimensions of the various surfaces of the inner ring, those which influence the plane difference are the raceway groove diameter of the inner ring (the smaller the diameter, the smaller the plane difference; in other words, as viewed from the outer ring back face, the inner ring front face is positioned further onwards), the cone back face rib width or, briefly, rib dimension (the smaller the dimension, the smaller the plane difference), and the width (the smaller the width, the greater the plane difference: in other words, as viewed from the outer ring back face, the inner ring front face is positioned further backwards).
Conventionally, this type of bearing inner ring is machined in the order of width surfaces--raceway groove--cone back face rib surface. However, since each is machined according to its independent target point, the final finish dimension in each surface has an independent variation. As a result, despite the fact that each surface has been finished within the limits of its predetermined tolerance, it has been impossible to keep the bearing assembly clearance (axial clearance) under strict control.
This will now be described in more detail with reference to the finish dimension of the rolling groove.
If the plane difference from the outer ring back face to the inner ring front face with the raceway groove machined to a finish dimension based on the inner ring front face (in the case of a double row tapered roller bearing, the dimension from the outer ring width center to the front face of each inner ring) can be maintained constant, the tolerance can be strictly controlled and assembly can be performed without using a spacer for filling the axial clearance of the bearing assembly. However, the conventional method has been by attractively holding the finish-ground inner ring back face (large end face) of the bearing inner ring on the backing plate of a grinding machine, and grinding the raceway groove by a grinding stone by rotating the backing plate and inner ring while measuring the raceway groove diameter by an in-process control gauge (which controls grinding operation) positioned a predetermined distance away from the backing plate. Since this is based on the measurement of the raceway groove diameter at that fixed position spaced away from the inner ring back face, it follows that the raceway groove is machined on the basis of the inner ring back face. When viewed from the inner ring front face providing a basis for the plane difference dimension, the position at which the rolling groove is measured differs for each wor
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patent: 2660006 (1953-11-01), Hegeman
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patent: 4222203 (1980-09-01), Wolff et al.
patent: 4363196 (1982-12-01), Uhtenwoldt
Egusa Tomoyoshi
Yamauchi Yutaka
NTN Toyo Bearing Co. Ltd.
Rose Robert A.
Schmidt Frederick R.
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