JP2011149836A5 - - Google Patents

Description

In order to achieve such an object, the invention according to claim 1 of the present invention includes an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel attachment for attaching a wheel to one end. The hub ring has a flange integrally formed with a small diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small diameter step portion of the hub ring. An inner member in which a double-row inner rolling surface facing the running surface is formed, and a double-row rolling element that is movably accommodated between the inner and outer members. And a magnetic encoder externally fitted to the inner ring, a seal is attached to the outer end of the outer member, and a protective cover is attached to the inner end of the outer member, The opening of the annular space formed by the outer member and the inner member is sealed. In the wheel bearing device with a speed detection device, the protective cover is formed in a cup shape by injection molding of a non-magnetic synthetic resin, and a cylindrical fitting portion fitted into the outer member, and the fitting A flange that protrudes radially outward from the flange and is in close contact with the inner end surface of the outer member, and extends radially inward from the flange, and has an inner end of the inner member. A metal core formed in a substantially L-shaped cross section by pressing from a steel plate is insert-molded into the fitting portion and the flange portion, and a rotational speed sensor is provided on the inner side surface of the bottom portion. A detection unit is disposed and is opposed to the magnetic encoder via a predetermined air gap, and a rib protrudes from at least one side surface of the bottom of the protective cover except for the opposed part. .

As described above, the magnetic encoder that is externally fitted to the inner ring is provided, the seal is attached to the outer end of the outer member, and the protective cover is attached to the inner end of the outer member. In a bearing device for a wheel with an inner ring rotation type rotational speed detection device in which an opening of an annular space formed by a member and an inner member is sealed, the protective cover is made of a nonmagnetic synthetic resin in a cup shape by injection molding A cylindrical fitting portion that is formed and fitted into the outer member, a flange portion that protrudes radially outward from the fitting portion, and that is in close contact with the inner end surface of the outer member; and It has a bottom portion that extends radially inward from the flange portion and closes the inner side end of the inner member, and is formed into a substantially L-shaped cross section by pressing from the steel plate at the fitting portion and the flange portion. The core bar is insert-molded and turned to the inner side of the bottom. Is arranged to detect portions of the speed sensor, while being opposed via a predetermined air gap magnetic encoder, except the portion that is the opposed ribs on at least one side of the bottom portion of the protective cover is formed to protrude Therefore, it is possible to increase the rigidity of the protective cover, to prevent the flying stones from being deformed even if they collide with the protective cover, and to set the air gap small and to improve the detection accuracy.

The wheel bearing device with a rotational speed detection device according to the present invention is integrally formed with an outer member in which a double row outer rolling surface is integrally formed on the inner periphery and a wheel mounting flange for mounting a wheel on one end. A hub ring having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step portion of the hub wheel, and facing the outer surface of the double row on the outer periphery. An inner member in which a double-row inner rolling surface is formed, a double-row rolling element housed between the inner member and the outer member so as to roll freely, and the inner ring A magnetic encoder externally fitted to the outer member, and a seal is attached to an outer end of the outer member, and a protective cover is attached to an inner end of the outer member. Speed at which the opening of the annular space formed by the inner member and the inner member is sealed In the wheel bearing device with a take-out device, the protective cover is formed into a cup shape by injection molding of a non-magnetic synthetic resin, and a cylindrical fitting portion fitted into the outer member, and the fitting portion And a flange that protrudes radially outward from the flange and adheres closely to the inner end surface of the outer member, and extends radially inward from the flange and closes the inner end of the inner member. A metal core having a substantially L-shaped cross section formed by pressing from a steel plate is insert-molded at the fitting portion and the flange portion, and a rotation speed sensor is detected on the inner side surface of the bottom portion. Since a portion is arranged and opposed to the magnetic encoder through a predetermined air gap, a rib protrudes from at least one side surface of the bottom portion of the protective cover except for the opposed portion. , Protective cover The rigidity, if with flying stones or the like can be prevented from being deformed even collide with the protective cover, it is possible to set small air gap, it is possible to improve the detection accuracy.

A vehicle body mounting flange to be attached to the knuckle on the outer periphery, an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange to mount a wheel on one end A hub wheel integrally formed and having one inner rolling surface opposed to the double-row outer rolling surface on the outer periphery, and a small-diameter step portion extending in the axial direction from the inner rolling surface, and the hub wheel An inner member formed of an inner ring that is press-fitted into the small-diameter step portion and formed with the other inner rolling surface opposite to the double row outer rolling surface, and the inner member and the outer member. A double row rolling element housed between the running surfaces so as to be freely rollable, and a magnetic encoder externally fitted to the inner ring, and a seal is attached to the outer end of the outer member, and A protective cover is attached to the inner side end of the outer member, and the outer member In the wheel bearing device with a rotational speed detection device in which the opening of the annular space formed by the inner member is sealed, by the crimping portion formed by plastically deforming the end portion of the small diameter step portion of the hub wheel, The inner ring is axially fixed to the hub ring in a state where a predetermined bearing preload is applied, and the protective cover is formed into a cup shape by injection molding of a non-magnetic synthetic resin. A cylindrical fitting portion fitted in the member, a flange portion that protrudes radially outward from the fitting portion, and is in close contact with the inner side end surface of the outer member, and a diameter from the flange portion A metal core that extends inward in the direction and has a bottom portion that closes an inner end of the inner member, and is formed into a substantially L-shaped cross section by pressing from a steel plate at the fitting portion and the flange portion. Is insert-molded, and the rotational speed is set on the inner side surface of the bottom. Detecting portion of the sensor is located, the while being opposed via a predetermined air gap magnetic encoder, except the portion that is the faces, ribs substantially equal extending horizontally on the outside of the bottom of the protective cover A plurality are formed at intervals.

Claims (18)

An outer member in which a double row outer rolling surface is integrally formed on the inner periphery;
From a hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and having a small-diameter step extending in the axial direction on the outer periphery, and at least one inner ring press-fitted into the small-diameter step of the hub ring An inner member in which a double row inner rolling surface facing the outer rolling surface of the double row is formed on the outer periphery,
A double row rolling element housed movably between the rolling surfaces of the inner member and the outer member;
A magnetic encoder fitted on the inner ring,
An annular space is formed by the outer member and the inner member having a seal attached to the outer end portion of the outer member and a protective cover attached to the inner end portion of the outer member. In the wheel bearing device with a rotational speed detection device in which the opening of
The protective cover is formed of a non-magnetic synthetic resin in a cup shape by injection molding, and is formed by a cylindrical fitting portion fitted into the outer member, and protruding radially outward from the fitting portion. A flange portion closely contacting the inner side end surface of the outer member, and a bottom portion extending radially inward from the flange portion and closing the inner side end portion of the inner member,
A cored bar formed in a substantially L-shaped cross section by press working from a steel plate at the part of the fitting portion and the flange portion is insert-molded,
A detection unit of a rotational speed sensor is disposed on the inner side surface of the bottom, and is opposed to the magnetic encoder through a predetermined air gap.
A wheel bearing device with a rotational speed detecting device, wherein a rib protrudes from at least one side surface of the bottom portion of the protective cover, excluding the facing portion.   The wheel bearing device with a rotation speed detecting device according to claim 1, wherein the core metal of the protective cover is formed of a non-magnetic austenitic stainless steel plate.   The inner ring is fixed to the hub ring in the axial direction with a predetermined bearing preload by a caulking portion formed by plastically deforming a small-diameter step portion of the hub ring radially outward. The wheel bearing device with a rotational speed detection device according to claim 1, wherein a stepped portion that bulges into a recess of the caulking portion is formed at the center of the bottom portion of the protective cover.   The wheel bearing device with a rotational speed detection device according to claim 3, wherein the stepped portion is formed in a substantially rectangular cross section along the shape of the recess of the caulking portion.   The detected surface of the magnetic encoder is disposed so as to protrude from the inner end surface of the outer member by a, and the protruding amount a is set smaller than the thickness t of the bottom of the protective cover (a <t). The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 4.   The wheel bearing device with a rotation speed detection device according to any one of claims 1 to 5, wherein a concave portion is formed in the bottom portion of the protective cover so as to be close to the magnetic encoder, and the detection portion is disposed in the concave portion.   The wheel bearing device with a rotational speed detecting device according to claim 6, wherein a concave amount c of the concave portion is set smaller than a thickness b of the flange portion of the protective cover (c <b).   The wheel bearing device with a rotation speed detecting device according to claim 6 or 7, wherein the concave portion is formed in an eyebrow shape.   The wheel bearing device with a rotation speed detection device according to claim 1, wherein a plurality of the ribs extend in a horizontal direction and are formed at substantially equal intervals.   The wheel bearing device with a rotational speed detection device according to claim 1, wherein a plurality of the ribs extend in a vertical direction and are formed at substantially equal intervals.   The wheel bearing device with a rotation speed detection device according to claim 1, wherein the rib is formed in a lattice shape.   The wheel bearing device with a rotation speed detecting device according to claim 1, wherein the ribs are formed on both side surfaces of the bottom portion of the protective cover, and the shapes of the ribs are different.   The ribs extending in the horizontal direction on one side surface of the bottom portion of the protective cover and formed in a plurality at substantially equal intervals, and a plurality of ribs extending in the vertical direction on the other side surface and formed in a plurality at substantially equal intervals. Wheel bearing device with a rotation speed detection device.   The wheel bearing device with a rotation speed detection device according to claim 1, wherein the ribs extend in the horizontal direction on both side surfaces of the bottom portion of the protective cover, and a plurality of the ribs have different phases and are formed at substantially equal intervals.   The wheel bearing device with a rotational speed detection device according to claim 1, wherein the rib is formed excluding a portion facing the magnetic encoder and a portion symmetrical to the portion.   The wheel bearing device with a rotation speed detection device according to claim 1, wherein a rib protrudes so as to surround a portion facing the magnetic encoder. The wheel bearing device with a rotational speed detection device according to any one of claims 1 to 16, wherein a reinforcing material made of glass fiber is added to the protective cover in an amount of 10 to 50 wt%.   The wheel bearing device with a rotation speed detecting device according to any one of claims 1 to 16, wherein a reinforcing material made of carbon fiber is added to the protective cover in an amount of 5 to 50 wt%.