Wheel bearing apparatus provided with a rotational speed detecting apparatus
First Claim
1. A wheel bearing apparatus with a rotational speed detecting apparatus comprising:
- an outer member integrally formed with a body mounting flange on its outer circumference, the body mounting flange is to be mounted on a knuckle, the outer member having an outer member inner circumference that includes double row outer raceway surfaces;
an inner member includes a wheel hub and at least one inner ring, the wheel hub is integrally formed with a wheel mounting flange, a cylindrical portion axially extends from the wheel mounting flange, the inner ring is press-fit onto the cylindrical portion of the wheel hub, the inner member is formed with double row inner raceway surface on its outer circumference, the double row inner raceway surfaces oppose the double row outer raceway surfaces;
double row rolling elements are contained between the inner raceway surfaces and outer raceway surfaces of the inner member and outer member;
a pulser ring is adapted to be fit onto an outer circumference of the inner ring, the pulser ring has magnetic characteristics alternately and equidistantly varying along its circumferential direction;
a sensor cap is press-formed from austenitic stainless steel sheet, coated by cation electro-deposition, and fit onto an inner-side end of the outer member;
a rotational speed sensor is mounted on the sensor cap at a radially outer position, the rotational speed sensor is arranged opposite to the pulser ring, via a predetermined first axial air gap;
a cup-shaped cap is subject to a phosphoric zinc treatment and is coated by preserving film formed by cation electro-deposition, the cup-shaped cap is mounted onto the outer member, the cup-shaped cap is press-formed of austenitic stainless steel sheet, the cup-shaped cap further comprises a cylindrical fitting portion, a disk portion, and a bottom portion, the cylindrical fitting portion is press-fit into the inner circumference of the inner-side end of the outer member, the disk portion extends radially inward from the fitting portion and opposes the pulser ring, via a second axial gap, the bottom portion extends from the disk portion, via a bent portion, to cover the inner-side end of the inner member; and
the rotational speed sensor is arranged opposite to the pulser ring, facing the disk portion of the cup-shaped cap, where the rotational speed sensor is adjacent to the disk portion.
1 Assignment
0 Petitions
Accused Products
Abstract
A wheel bearing apparatus has a cup-shaped cap that is coated by a preserving film and mounted on an outer member. The cap is press-formed from non-magnetic steel sheet. The cap has a cylindrical fitting portion, a disk portion and a bottom portion. The cylindrical fitting portion is press-fit into the inner circumference of the inner-side end of the outer member. The disk portion extends radially inward from the fitting portion and opposes a pulser ring, via a small axial gap. The bottom portion extends from the disk portion, via a bent portion, to cover the inner-side end of the inner member. The rotational speed sensor is arranged opposite the pulser ring, via the disk portion of the cap, where the rotational speed sensor is closely arranged to the pulser ring.
23 Citations
10 Claims
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1. A wheel bearing apparatus with a rotational speed detecting apparatus comprising:
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an outer member integrally formed with a body mounting flange on its outer circumference, the body mounting flange is to be mounted on a knuckle, the outer member having an outer member inner circumference that includes double row outer raceway surfaces; an inner member includes a wheel hub and at least one inner ring, the wheel hub is integrally formed with a wheel mounting flange, a cylindrical portion axially extends from the wheel mounting flange, the inner ring is press-fit onto the cylindrical portion of the wheel hub, the inner member is formed with double row inner raceway surface on its outer circumference, the double row inner raceway surfaces oppose the double row outer raceway surfaces; double row rolling elements are contained between the inner raceway surfaces and outer raceway surfaces of the inner member and outer member; a pulser ring is adapted to be fit onto an outer circumference of the inner ring, the pulser ring has magnetic characteristics alternately and equidistantly varying along its circumferential direction; a sensor cap is press-formed from austenitic stainless steel sheet, coated by cation electro-deposition, and fit onto an inner-side end of the outer member; a rotational speed sensor is mounted on the sensor cap at a radially outer position, the rotational speed sensor is arranged opposite to the pulser ring, via a predetermined first axial air gap; a cup-shaped cap is subject to a phosphoric zinc treatment and is coated by preserving film formed by cation electro-deposition, the cup-shaped cap is mounted onto the outer member, the cup-shaped cap is press-formed of austenitic stainless steel sheet, the cup-shaped cap further comprises a cylindrical fitting portion, a disk portion, and a bottom portion, the cylindrical fitting portion is press-fit into the inner circumference of the inner-side end of the outer member, the disk portion extends radially inward from the fitting portion and opposes the pulser ring, via a second axial gap, the bottom portion extends from the disk portion, via a bent portion, to cover the inner-side end of the inner member; and the rotational speed sensor is arranged opposite to the pulser ring, facing the disk portion of the cup-shaped cap, where the rotational speed sensor is adjacent to the disk portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification