Wheel bearing apparatus incorporated with a rotational speed detecting apparatus
First Claim
1. A wheel bearing apparatus incorporating a rotational speed detecting 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 is integrally formed at one end 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 wheel hub and the inner ring are formed with double row inner raceway surfaces on their outer circumferences, the inner raceway surfaces oppose the double row outer raceway surfaces;
double row rolling elements are rollably contained between the inner raceway surfaces and outer raceway surfaces of the inner member and outer member;
a magnetic encoder is adapted to be fit onto the outer circumference of the inner ring and secured to the inner ring, the magnetic encoder has a magnetic characteristics alternately and equidistantly varying in a circumferential direction;
a seal is mounted on an outer-side end of the outer member, a protecting cover is mounted on an inner-side of the outer member, the seal and protecting cover close and seal annular openings formed between the outer member and the inner member;
the protecting cover is formed of non-magnetic steel sheet to have a cup-shaped configuration by press working, the protective cover includes a cylindrical fitting portion press-fit into an end, inner circumference of the outer member, a donut-shaped shielding portion extends radially inward from the fitting portion via a radially reducing portion, an inner-side surface of the shielding portion is arranged near to or in contact with a rotational speed detecting sensor, a bottom portion is continuous with the shielding portion via a stepped portion to close the inner-side end of the inner member;
a sealing member is integrally adhered to the outer circumference of the radially reducing portion by vulcanizing adhesion, the sealing member includes an annular portion and a projected portion, the annular portion of the sealing member is positioned axially inside of the projected portion, the annular portion is formed with a diameter slightly smaller than the outer diameter of the fitting portion of the protecting cover, the projected portion is formed with a diameter slightly larger than the outer diameter of the fitting portion of the protecting cover; and
the projected portion is press-fit into the end inner circumference of the outer member via a predetermined interference.
1 Assignment
0 Petitions
Accused Products
Abstract
A wheel bearing apparatus incorporating a rotational speed detecting apparatus has a protecting cover. A cylindrical fitting portion of the cover is press-fit into the end inner circumference of the outer member. A donut-shaped shielding portion extends radially inward from the fitting portion, via a radially reducing portion. A bottom portion is continuous with the shielding portion, via a stepped portion, to close the inner-side end of the inner member. A sealing member is integrally adhered to the outer circumference of the radially reducing portion. The sealing member and annular portion has a diameter slightly smaller than the outer diameter of the fitting portion of the protecting cover. The sealing member projected portion has a diameter slightly larger than the outer diameter of the fitting portion of the protecting cover. The projected portion is press-fit into the end inner circumference of the outer member via a predetermined interference.
29 Citations
25 Claims
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1. A wheel bearing apparatus incorporating a rotational speed detecting apparatus comprising:
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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 is integrally formed at one end 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 wheel hub and the inner ring are formed with double row inner raceway surfaces on their outer circumferences, the inner raceway surfaces oppose the double row outer raceway surfaces; double row rolling elements are rollably contained between the inner raceway surfaces and outer raceway surfaces of the inner member and outer member; a magnetic encoder is adapted to be fit onto the outer circumference of the inner ring and secured to the inner ring, the magnetic encoder has a magnetic characteristics alternately and equidistantly varying in a circumferential direction; a seal is mounted on an outer-side end of the outer member, a protecting cover is mounted on an inner-side of the outer member, the seal and protecting cover close and seal annular openings formed between the outer member and the inner member; the protecting cover is formed of non-magnetic steel sheet to have a cup-shaped configuration by press working, the protective cover includes a cylindrical fitting portion press-fit into an end, inner circumference of the outer member, a donut-shaped shielding portion extends radially inward from the fitting portion via a radially reducing portion, an inner-side surface of the shielding portion is arranged near to or in contact with a rotational speed detecting sensor, a bottom portion is continuous with the shielding portion via a stepped portion to close the inner-side end of the inner member; a sealing member is integrally adhered to the outer circumference of the radially reducing portion by vulcanizing adhesion, the sealing member includes an annular portion and a projected portion, the annular portion of the sealing member is positioned axially inside of the projected portion, the annular portion is formed with a diameter slightly smaller than the outer diameter of the fitting portion of the protecting cover, the projected portion is formed with a diameter slightly larger than the outer diameter of the fitting portion of the protecting cover; and the projected portion is press-fit into the end inner circumference of the outer member via a predetermined interference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wheel bearing apparatus incorporating a rotational speed detecting apparatus comprising:
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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 is integrally formed at one end 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 wheel hub and the inner ring are formed with double row inner raceway surfaces on their outer circumferences, the inner raceway surfaces oppose the double row outer raceway surfaces; double row rolling elements are rollably contained between the inner raceway surfaces and outer raceway surfaces of the inner member and outer member; a magnetic encoder is adapted to be fit onto the outer circumference of the inner ring and secured to the inner ring, the magnetic encoder has a magnetic characteristics alternately and equidistantly varying in a circumferential direction; a seal is mounted on an outer-side end of the outer member, a protecting cover is mounted on an inner-side of the outer member, the seal and protecting cover close and seal annular openings formed between the outer member and the inner member; the protecting cover is formed of non-magnetic steel sheet to have a cup-shaped configuration by press working, the protective cover includes a cylindrical fitting portion press-fit into an end inner circumference of the outer member, a donut-shaped shielding portion extends radially inward from the fitting portion via a radially reducing portion, an inner-side surface of the shielding portion is arranged near to or in contact with a rotational speed detecting sensor, a bottom portion is continuous with the shielding portion via a stepped portion to close the inner-side end of the inner member; a sealing member is integrally adhered to the outer circumference of the radially reducing portion by vulcanizing adhesion, the sealing member includes an annular portion and a projected portion, the annular portion is formed with a diameter slightly smaller than the outer diameter of the fitting portion of the protecting cover, the projected portion is formed with a diameter slightly larger than the outer diameter of the fitting portion of the protecting cover; the projected portion is press-fit into the end inner circumference of the outer member via a predetermined interference; and a fitting volume of the projected portion of the sealing member is determined so that it is smaller than a volume of an annular space formed between the annular portion of the sealing member and the end inner circumference of the outer member under a condition where a press-fitting tool is in contact with the sealing member. - View Dependent Claims (11)
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12. A wheel bearing apparatus incorporating a rotational speed detecting apparatus comprising:
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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 is integrally formed at one end 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 wheel hub and the inner ring are formed with double row inner raceway surfaces on their outer circumferences, the inner raceway surfaces oppose the double row outer raceway surfaces; double row rolling elements are rollably contained between the inner raceway surfaces and outer raceway surfaces of the inner member and outer member; a magnetic encoder is adapted to be fit onto the outer circumference of the inner ring and secured to the inner ring, the magnetic encoder has a magnetic characteristics alternately and equidistantly varying in a circumferential direction; a seal is mounted on an outer-side end of the outer member, a protecting cover is mounted on an inner-side of the outer member, the seal and protecting cover close and seal annular openings formed between the outer member and the inner member; the protecting cover is formed of non-magnetic steel sheet to have a cup-shaped configuration by press working, the protective cover includes a cylindrical fitting portion press-fit into an end inner circumference of the outer member, a donut-shaped shielding portion extends radially inward from the fitting portion via a radially reducing portion, an inner-side surface of the shielding portion is arranged near to or in contact with a rotational speed detecting sensor, a bottom portion is continuous with the shielding portion via a stepped portion to close the inner-side end of the inner member; a sealing member is integrally adhered to the outer circumference of the radially reducing portion by vulcanizing adhesion, the sealing member includes an annular portion and a projected portion, the annular portion is formed with a diameter slightly smaller than the outer diameter of the fitting portion of the protecting cover, the projected portion is formed with a diameter slightly larger than the outer diameter of the fitting portion of the protecting cover; the projected portion is press-fit into the end inner circumference of the outer member via a predetermined interference; and a transitional portion between the end inner circumference and a chamfered portion of the outer member is formed as a circular arc with a predetermined radius of curvature. - View Dependent Claims (13)
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14. A wheel bearing apparatus incorporating a rotational speed detecting apparatus comprising:
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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 is integrally formed at one end 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 wheel hub and the inner ring are formed with double row inner raceway surfaces on their outer circumferences, the inner raceway surfaces oppose the double row outer raceway surfaces; double row rolling elements are rollably contained between the inner raceway surfaces and outer raceway surfaces of the inner member and outer member; a magnetic encoder is adapted to be fit onto the outer circumference of the inner ring and secured to the inner ring, the magnetic encoder has a magnetic characteristics alternately and equidistantly varying in a circumferential direction; a seal is mounted on an outer-side end of the outer member, a protecting cover is mounted on an inner-side of the outer member, the seal and protecting cover close and seal annular openings formed between the outer member and the inner member; the protecting cover is formed of non-magnetic steel sheet to have a cup-shaped configuration by press working, the protective cover includes a cylindrical fitting portion press-fit into an end inner circumference of the outer member, a donut-shaped shielding portion extends radially inward from the fitting portion via a radially reducing portion, an inner-side surface of the shielding portion is arranged near to or in contact with a rotational speed detecting sensor, a bottom portion is continuous with the shielding portion via a stepped portion to close the inner-side end of the inner member; a sealing member is integrally adhered to the outer circumference of the radially reducing portion by vulcanizing adhesion, the sealing member includes an annular portion and a projected portion, the annular portion is formed with a diameter slightly smaller than the outer diameter of the fitting portion of the protecting cover, the projected portion is formed with a diameter slightly larger than the outer diameter of the fitting portion of the protecting cover; the projected portion is press-fit into the end inner circumference of the outer member via a predetermined interference; and a cup-shaped sensor cap is fit into the inner-side end of the outer member, the rotational speed sensor is mounted on the sensor cap, and the rotational speed sensor opposes the magnetic encoder via a predetermined axial air gap. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification