Compact gauge and process for adjusting bearings

The combination with inner and outer machine components and first and second bearings for enabling one of the components to rotate relative to the other component about an axis, the outer component having an axially directed bore and a positioning surface located at an angle with respect to the axis, the first bearing including a tapered inner raceway carried by the inner member and a tapered outer raceway carried by the outer component and tapered rollers organized in a row between the inner and outer raceways, the second bearing including an inner raceway carried by the inner member and presented outwardly away from the axis and an outer race unit provided with an outer raceway that is presented inwardly toward the axis, and tapered rollers organized in a row around the raceway of the inner race, the outer race unit being capable of fitting into the bore of the outer machine component and having a positioning surface located at an angle with respect to the axis, the raceways and rollers of the first bearing having their large ends presented toward the large ends of the raceways and rollers for the second bearing so that the bearings are in the direct configuration, a setting gauge for positioning the outer race unit of the second bearing in the bore of the outer component, with the radial positioning between the positioning surface on the outer component and the positioning surface on the outer race unit of the second bearing being such that the directly mounted first and second bearings have a desired setting, said setting gauge comprising:

• a base fitted at its one end against the positioning surface on the outer machine component and at its other end against the positioning surface on the outer race unit;
• a male gauge element located in the base such that it can shift axially on the base and having a tapered external surface that fits into the outer race unit and bears against the tapered raceway of the outer race unit;
• a female gauge element located in the base such that it can shift axially on the base and has one end that fits into the bore in the outer machine component where it is provided with a tapered internal surface that its over and seats against the rollers of the second bearing, with the angle of its taper corresponding to the angle of the taper on the raceway for the outer race unit of the second bearing;
• a spring urging the male and female elements apart;
• and a stain sensor on the spring for determining the change in strain imparted to the spring as the distance between the first and second elements varies, so that the distance between the tapered surfaces on the first and second elements may be derived from the strain, whereby the spacing between the positioning surface, when the outer race unit is installed in the bore, may be determined.

A gauge for setting a pair of tapered roller bearings mounted in opposition to accommodate rotation about an axis, said gauge comprising:

• first and second gauge elements mounted end-to-end for establishing a measured distance, a third element extending between the first and second elements and establishing a fixed distance;
• one of the elements having a tapered internal surface, one of the elements having a tapered external surface, the taper of which corresponds to the taper of the internal surface, one of the elements having a front face located at an angle with respect to the axis, one of the elements having a rear face that is located at an angle with respect to the axis and is spaced axially from the front face;
• a spring positioned to urge the first and second elements apart;
• and a strain sensor mounted on the spring for determining the change in strain imparted to the spring as the distance between the first and second elements varies.

A process for setting first and second bearings that accommodate relative rotation between inner and outer machine components about an axis, one of the machine components having a positioning surface located at an angle with respect to the axis, the first bearing including inner and outer tapered raceways carried by the inner and outer machine components, respectively, and tapered rollers organized in a row between the raceways, the second bearing including inner and outer tapered raceways and tapered rollers located along the inner raceway, the outer raceway and the tapered rollers defining identical conical envelopes having their axes coinciding with the axis of rotation, one of the raceways of the second bearing being on a race unit that has a positioning surface oriented at an angle with respect to the axis and spaced axially from the positioning surface on said one machine component the other raceway of the second bearing being carried by the other machine component, the tapered rollers of the first and second bearings being oriented in opposite directions, said process comprising:

• placing the inner machine component in the outer machine component
• seating the rollers of the first bearing along the tapered surfaces for the first bearing with the bearing being between the machine components;
• installing a gauge between the positioning surfaces on said one machine component and the race unit of the second bearing and between the conical envelopes of the second bearing so that the conical envelope are spaced axially apart, the gauge including first, second and third elements, two of which are located generally end-to-end to establish a measured distance and the other of which extends between the end-to-end components and establishes a fixed distance, the gauge also including a spring which urges the end-to-end elements apart,
• measuring the strain in the spring to determine the measured distance;
• using the difference between the measured and fixed distances to determine the size of a spacer which, when installed between the positioning surfaces will provide the bearings with the proper setting.