Wheel bearing apparatus
First Claim
1. A wheel bearing apparatus comprising:
- an outer member integrally formed with double row outer raceway surfaces on its inner circumference;
an inner member including a wheel hub and at least one inner ring, the wheel hub integrally formed with a wheel mounting flange on its one end and having an axially extending cylindrical part, the inner ring press fit onto the cylindrical part of the wheel hub, the inner member formed, on its outer circumference, with double row inner raceway surfaces opposing the double row outer raceway surfaces;
double row rolling elements accommodated between the inner raceway surfaces and outer raceway surfaces, respectively, of the inner member and outer member;
a magnetic encoder mounted on the outer circumference of the inner ring;
a cap fit into an inner-side end of the outer member to seal an annulus opening formed by the outer member and the inner ring;
a rotational speed sensor opposing the magnetic encoder via the cap and an air gap;
the cap formed into a cup-shape so that it has a cylindrical fitting part press-fit into an inner circumference of an end of the outer member, a shielding part extends radially inward from the fitting part and has an annular disc shape, a detection part of the rotational speed sensor arranged close to or in contact with a side surface of the shielding part; and
the cap is formed of austenitic stainless steel sheet based on SUS 304 with a reduced carbon (C) content and an increased nickel (Ni) content, and a difference of magnetic flux density between a martensitic transformation part and non-martensite part is 1.4 mT or less.
1 Assignment
0 Petitions
Accused Products
Abstract
A wheel bearing apparatus has a magnetic encoder 14 mounted on an inner ring 5 opposing the rotational speed sensor 16, via the cap 10 and an air gap. The cap 10 has a cylindrical fitting part 10a press-fit into an inner circumference of an end of the outer member 2. A shielding part 10c extends radially inward from the fitting part 10a and has an annular disc shape. A detection part 16a of the rotational speed sensor 16 is arranged close to or in contact with a side surface of the shielding part 10c. The cap 10 is formed of austenitic stainless steel sheet based on SUS 304. The carbon (C) content is reduced and the nickel (Ni) content is increased. A difference of magnetic flux density between a martensitic transformation part and non-martensite part is 1.4 mT or less.
-
Citations
4 Claims
-
1. A wheel bearing apparatus comprising:
-
an outer member integrally formed with double row outer raceway surfaces on its inner circumference; an inner member including a wheel hub and at least one inner ring, the wheel hub integrally formed with a wheel mounting flange on its one end and having an axially extending cylindrical part, the inner ring press fit onto the cylindrical part of the wheel hub, the inner member formed, on its outer circumference, with double row inner raceway surfaces opposing the double row outer raceway surfaces; double row rolling elements accommodated between the inner raceway surfaces and outer raceway surfaces, respectively, of the inner member and outer member; a magnetic encoder mounted on the outer circumference of the inner ring; a cap fit into an inner-side end of the outer member to seal an annulus opening formed by the outer member and the inner ring; a rotational speed sensor opposing the magnetic encoder via the cap and an air gap; the cap formed into a cup-shape so that it has a cylindrical fitting part press-fit into an inner circumference of an end of the outer member, a shielding part extends radially inward from the fitting part and has an annular disc shape, a detection part of the rotational speed sensor arranged close to or in contact with a side surface of the shielding part; and the cap is formed of austenitic stainless steel sheet based on SUS 304 with a reduced carbon (C) content and an increased nickel (Ni) content, and a difference of magnetic flux density between a martensitic transformation part and non-martensite part is 1.4 mT or less. - View Dependent Claims (2, 3, 4)
-
Specification