JP2009286309A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device which prevents fuel consumption from being worsened, by reducing a friction torque by simplifying a structure of a sealing device used for a device adjusting a tire pressure. <P>SOLUTION: The rolling bearing device 1 is used for a vehicle tire pressure adjusting device provided with a compressed fluid supply source 9 for a tire air chamber 5b, and is provided with: an inner ring 2b; an outer ring 2a; and rollers 2c. The device is also provided with: a sealing member 11 mounted between a protruded end surface of an annular protruded wall 2a2 which is protruded to the inner ring 2b side and is integrally formed from all the circumference of inner circumference of the outer ring 2a in an annular space chamber 2f between the inner and outer rings 2b and 2a, and the outer circumferential surface of the inner ring 2b; a protruded wall distribution hole 2a3 inside the protruded wall 2a2 formed to communicate with an outer ring distribution hole 2a1 formed inside the outer ring 2a as a part of a compressed fluid flow passage; and an inner ring distribution hole 2b1 formed inside the inner ring 2b. A connection space S is formed by sealing a gap between the pair of sealing members 11, and the protruded wall distribution hole 2a3 and the inner ring distribution hole 2b1 are communicated with each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rolling bearing device that can be used in a system for adjusting the tire pressure of an automobile.

  As a system for improving the running of an automobile in response to various conditions such as road surface conditions and running speed, a system in which tire air pressure can be adjusted while the automobile is running is known (see Patent Document 1). ).

JP 2000-255228 A

  In the tire pressure adjusting system, a compressed air supply source on the vehicle side is connected to a tire by an air flow path. This air flow path is provided through a hub bearing to which a tire is attached. The hub bearing includes an outer ring that rotatably supports a hub to which a tire is attached by an inner ring and is fixed to a knuckle. An air flow path is formed using the space between the inner and outer rings of the hub bearing. The air flow path in this space is kept airtight by a sealing material that allows relative rotation of the inner and outer rings.

  As shown in FIG. 5, the seal material includes a seal lip C made of a rubber-like elastic body that is vulcanized and bonded to a metal core B fitted to the inner peripheral side of the outer ring A, and the seal lip C includes an inner ring D. An annular spring E is provided so as to be brought into contact with the outer peripheral side of the member by a desired tightening force. For this reason, this tension force is maintained even when the space between the inner and outer rings of the hub bearing is not pressurized (released to the atmosphere) except for air supply / exhaust. For this reason, it has the subject that fuel consumption deteriorates by the friction torque according to tension.

  An object of the present invention is to provide a rolling bearing device that reduces friction torque and prevents deterioration of fuel consumption while simplifying a sealing structure used in a device that adjusts tire air pressure.

Means for Solving the Problems and Effects of the Invention

  In order to solve the above-described problems, a rolling bearing device according to the present invention includes a vehicle including a compressed fluid supply source capable of supplying a compressed fluid to a tire air chamber in a tire mounted on a wheel via a compressed fluid channel. A rolling bearing device that is used in a tire pressure adjusting device for an automobile and includes an outer ring connected to a vehicle fixing member, an inner ring connected to the tire, and a rolling element interposed between the inner ring and the outer ring. An annular ridge wall integrally formed from the entire inner circumference of the outer ring and projecting toward the inner ring side in the annular space chamber sealed between the inner ring and the outer ring, and the ridge wall A seal member mounted so as to be held between the protruding end surface of the inner ring and the outer peripheral surface of the inner ring, an outer ring circulation hole formed in the outer ring as a part of the compressed fluid flow path, and communication with the outer ring circulation hole The ridge wall flow hole in the formed ridge wall, and the front An inner ring circulation hole as a part of the compressed fluid flow path formed inside the inner ring, and the seal members are arranged in parallel in the axial direction of the outer ring and seal between the seal members Thus, a connection space is formed, and the protruding wall circulation hole and the inner ring circulation hole are sealed with each other by the connection space.

  With the above configuration, the connection space between the rib wall and the inner ring is annular, so that a ring-shaped member can be used as the seal member. This ring-shaped seal member is highly versatile, and its mounting structure can be dealt with by forming a groove in one of the rib wall or the inner ring, so that the sealing structure can be simplified. In addition, the ring-shaped seal member is hardly deformed by a pressure change caused by the compressed fluid, and the influence on the friction torque due to an increase in the sealing force (tight force) can be reduced. In addition, when fitting to the outer ring as in the background art, the labor is required for positioning, but since the present invention is an integrally formed rib wall, it does not take time to seal the seal position with the inner ring. Can be assembled to position.

  In order to solve the above problems, the seal member of the rolling bearing device of the present invention is formed in a ring shape and is mounted on the protruding end surface of the ridge wall. Since it is circumferentially mounted, the workability at the time of mounting can be simplified, and the ring-shaped seal member can be selected from various types such as O-ring, X-ring, T-ring, and D-ring. . Further, such a ring-shaped seal member is hardly deformed by the pressure due to the compressed fluid, and the influence on the friction torque due to an increase in the sealing force (tight force) can be reduced.

  In order to solve the above-mentioned problems, the seal member of the rolling bearing device of the present invention is made of a low friction material, so that the influence on the friction torque can be further reduced, and the seal member itself Durability due to wear is also improved.

  Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. FIG. 1 is a cross-sectional view of a mounted state of a rolling bearing device according to the present invention. In FIG. 1, a rolling bearing device 1 includes an outer ring 2a as a fixed ring, an inner ring 2b as a rotating ring, and rolling elements 2c arranged in a plurality of rows interposed between the inner ring 2b and the outer ring 2a. The rolling bearing 2 is provided.

  Further, the inner ring 2b is integrally formed as shown in the figure, is a divided body formed of two separate bodies divided in the axial direction Z, or further, a divided body on the vehicle outer side and a hub 4 described later. It is not limited whether to integrate the press-fit shaft portion 4b. Further, grease is enclosed in the annular space chamber 2f.

  The rolling bearing 2 is provided with a sealing device 2g for sealing the annular space 2f between the outer ring 2a and the inner ring 2b from the outside. The sealing device 2g is provided on both ends of the rolling bearing 2 in the axial direction Z.

  The rolling bearing 2 is connected to an attachment port 3a of a vehicle fixing member 3 such as a knuckle or an axle housing on the vehicle inner side of a suspension device in the vehicle. In this connection, the outer ring 2a of the rolling bearing 2 is inserted and fitted into the mounting port 3a, and the flange portion 2d protruding outward from the outer ring 2a is fixed to the vehicle via a fastening member 2e such as a bolt and a nut. The member 3 is fixed to the peripheral surface (vehicle outer side) of the attachment port 3a.

  The inner ring 2 b of the rolling bearing 2 is connected to the hub 4. The hub 4 has a hub bolt 4a for mounting the wheel 5 on the vehicle outer side. The wheel 5 includes a tire 5c that is attached to the wheel 5a to form a tire air chamber 5b.

  The hub 4 has a press-fit shaft portion 4b that is press-fitted into the inner ring 2b of the rolling bearing 2 on the vehicle inner side. The press-fit shaft portion 4b is press-fitted into the inner ring 2b and the hub 4 rotates together with the inner ring 2b. It is provided as possible. The hub 4 is spline-coupled to the drive shaft 6, and one end side of the drive shaft 6 is passed through an insertion hole 4 c formed in the press-fit shaft portion 4 b of the hub 4, and a nut 7 is screwed to this end portion to be fixed. Has been.

  As shown in FIG. 4, the suspension device using the rolling bearing device 1 is provided with a vehicle tire pressure adjusting device 8 for adjusting the air pressure in the tire air chamber 5 b of the wheel 5. The vehicle tire pressure adjusting device 8 includes a compressed fluid supply source 9 such as an accumulator for accumulating a compressed fluid provided on the vehicle side, a compressor for generating the compressed fluid, and the compressed fluid from the compressed fluid supply source 9 as a tire. And a compressed fluid flow path 10 for supplying the air chamber 5b.

  As shown in FIGS. 1 and 4, the compressed fluid flow path 10 is a fixed member distribution formed inside the vehicle fixing member 3 in a state where the rolling bearing device 1 is attached to the vehicle fixing member 3 and the wheels 5 are mounted. A hole 3b, an outer ring circulation hole 2a1 formed inside the outer ring 2a, a bearing channel 2d1 provided in the annular space 2f between the outer ring 2a and the inner ring 2b, and an inner ring circulation hole formed inside the inner ring 2b. 2b1, the hub circulation hole 4e formed inside the hub 4, and the wheel circulation hole 5a1 formed inside the wheel 5a are connected so as to communicate continuously.

  The bearing flow path part 2d1 is provided between the rolling elements 2c arranged in a double row. In the annular space 2f between the rolling elements 2c, an annular ridge wall 2a2 that is integrally formed from the entire inner periphery of the outer ring 2a and has a predetermined width in the axial direction Z protrudes toward the inner ring 2b. Inside the ridge wall 2a2, a ridge wall circulation hole 2a3 formed in communication with the outer ring circulation hole 2a1 is provided.

  The rib wall circulation hole 2a3 and the inner ring circulation hole 2b1 are connected in communication. A pair of ring-shaped seal members 11 is provided at the connection location. The seal member 11 is attached to the protruding end surface of the ridge wall 2a2 that is the opening side of the ridge wall flow hole 2a3. More specifically, 2 in the seal mounting groove 2a4 formed in parallel on both sides (axial direction Z) of the opening portion with the opening portion of the protrusion wall flow hole 2a3 in between on the inner peripheral side of the protrusion wall 2a2. A body seal member 11 is attached. The two seal members 11 are brought into contact with the circular outer peripheral surface of the inner ring 2 b to form a connection space S so as to seal between the seal members 11. By this connection space S, the rib wall circulation hole 2a3 and the inner ring circulation hole 2b1 are communicated.

  As the seal member 11, besides the O-ring, an X-ring having an X-shaped cross section as shown in FIG. 3A, a T-ring having a T-shaped cross section as shown in FIG. Examples thereof include a D-ring having a D-shaped cross section as shown in c). The seal member 11 is made of a rubber-like elastic material having a low friction performance. For example, at least the surface portion of the seal member 11 is covered with a fluorine resin as a low friction material, or the whole is low friction. It can be made of a material.

  When the rolling bearing device 1 configured as described above adjusts the tire pressure of the tire air chamber 5b to be high, for example, the compressed air of the compressed fluid supply source 9 is supplied to the tire air chamber 5b via the compressed fluid flow path 10. To send in. For example, by opening the hub flow hole 4e of the compressed fluid passage 10 to the outside, the rolling bearing device 1 itself can be used to be cooled by compressed air, and the life of the rolling bearing device is extended. be able to.

  During the pressurized supply of the compressed fluid, the bearing flow path portion 2d1 constituting a part of the compressed fluid flow path 10 is also in a pressurized state. The seal member 11 that seals the bearing flow path portion 2d1 in this state prevents the compressed air from leaking by a sealing force (stressing force) that is elastically deformed by a predetermined crushing margin. In addition, the seal member 11 is hardly deformed by the pressure due to the compressed fluid in the bearing flow passage portion 2d1, and the influence on the friction torque due to an increase in the sealing force can be reduced. Further, when the seal member 11 has a low friction function, the influence on the friction torque can be further reduced.

Sectional drawing of the attachment state of the rolling bearing apparatus which concerns on this invention. The elements on larger scale of a rolling bearing apparatus. The fragmentary sectional view which shows the other example of a sealing member. The system schematic of a compression fluid path. The figure which shows the sealing material of background art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rolling bearing apparatus 2a Outer ring 2a1 Outer ring flow hole 2a2 Rib wall 2a3 Rib wall flow hole 2b Inner ring 2b1 Inner ring flow hole 2c Rolling element 2d1 Bearing flow path part 2f Annular space 5a Wheel 5b Tire air chamber 5c Tire 8 Vehicle tire Pressure adjusting device 9 Compressed fluid supply source 10 Compressed fluid flow path 11 Seal member

Claims (3)

Used in a vehicle tire pressure adjusting device having a compressed fluid supply source capable of supplying a compressed fluid to a tire air chamber in a tire mounted on a wheel via a compressed fluid flow path, and connected to a vehicle fixing member A rolling bearing device comprising an outer ring, an inner ring connected to the tire, and a rolling element interposed between the inner ring and the outer ring,
An annular ridge wall integrally formed from the entire circumference of the inner periphery of the outer ring and projecting toward the inner ring, in a sealed annular space between the inner ring and the outer ring,
A seal member mounted so as to be held between the protruding end surface of the protruding wall and the outer peripheral surface of the inner ring;
An outer ring circulation hole formed inside the outer ring as a part of the compressed fluid flow path;
A ridge wall flow hole inside the ridge wall formed in communication with the outer ring flow hole;
An inner ring circulation hole as a part of the compressed fluid flow path formed inside the inner ring;
With
The seal members form a pair and are arranged in parallel in the axial direction of the outer ring, and a seal space is formed between the seal members to form a connection space. The connection space defines the protrusion wall flow hole and the inner ring flow hole. A rolling bearing device characterized in that it communicates with each other.   The rolling bearing device according to claim 1, wherein the seal member is formed in a ring shape and is attached to a protruding end surface of the ridge wall.   The rolling bearing device according to claim 1, wherein the seal member is made of a low friction material.

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