JP2008279860A - Bearing unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost bearing unit capable of fixing a vehicle body side component and the bearing unit mutually solidly while using the vehicle body side component as it is. <P>SOLUTION: This bearing unit is provided with an annular static wheel 2 with a 2-meter annular fitting circumferential surface that can be fitted relative to the 20-meter component circumferential surface of the vehicle body side component (knuckle 20), and an annular rotational wheel 4 rotated along with a wheel. It is further provided with a fixing mechanism capable of fixing the static wheel in the vehicle body side component when the component circumferential surface and the fitting circumferential surface are fitted. The fixing mechanism is provided with a recessed groove G1 formed in the fitting circumferential surface, an elastic member 34 stored in the recessed groove in an elastically deformable condition toward the outside the groove, and a receiving groove 20g formed in the component circumferential surface and capable of receiving a part of the elastic member. When the fitting circumferential surface and the component circumferential surface are fitted, the part of the elastic member stored in the recessed groove enters the receiving groove by its elastic force. Thus, the vehicle body side component and the bearing unit are positioned and fixed mutually. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bearing unit for rotatably supporting a vehicle wheel (for example, a disc wheel) with respect to a vehicle body side component (for example, a suspension device (knuckle)).

  2. Description of the Related Art Conventionally, a bearing unit that supports a vehicle wheel rotatably with respect to a suspension device (knuckle) by press-fitting and fixing a vehicle body side component (suspension device (knuckle)) to an outer ring of a rolling bearing is known. As an example, the bearing unit shown in FIG. 3 is a pair of a substantially cylindrical hub 1 that rotates together while supporting a disc wheel (not shown) of an automobile, and a pair of caulking fixed (fitted) to the outer periphery of the hub 1. The inner ring 3, the outer ring 5 opposed to the inner ring 3, and a plurality of rolling elements (balls) 7 incorporated between the outer inner rings 3 and 5 in a double row (Patent Document 1).

  Further, the outer ring outer diameter surface 5m of the outer ring 5 has a cylindrical shape, while the knuckle inner diameter surface 9m of the suspension device (knuckle) 9 has a hollow cylindrical shape having a diameter capable of being press-fitted into the outer ring outer diameter surface 5m. Is made. In this case, with the outer inner rings 3 and 5 assembled on the outer periphery of the hub 1, the outer ring outer diameter surface 5m of the outer ring 5 is press-fitted into the knuckle inner diameter surface 9m, and the suspension device (knuckle) 9 is fixed to the bearing unit. Thus, the suspension device (knuckle) 9 can be connected to the wheel of the automobile through the bearing unit.

  By the way, in order to firmly fix the suspension device (knuckle) 9 and the bearing unit to each other in the conventional fixing method, not only the outer ring outer diameter surface 5m and the knuckle inner diameter surface 9m are finished with high precision, but also the knuckle inner diameter surface 9m. For this, it is necessary to form a contact portion 9a for contacting the press-fitted outer ring 5 and a fitting groove 9g for fitting a ring 11 for preventing the outer ring 5 from coming off. In this case, not only the manufacturing cost of the bearing unit itself is increased, but also the contact portion 9a and the fitting groove 9g must be separately formed in the vehicle body side component (suspension device (knuckle) 9). The manufacturing cost of the suspension device (knuckle) 9 also increases. If it becomes so, the manufacturing cost of the whole axle structure will rise.

  Therefore, Patent Document 2 proposes a method of fixing the suspension device (knuckle) and the bearing unit to each other by caulking the outer ring of the bearing unit toward the suspension device (knuckle). However, with such a fixing method, it is not necessary to make significant improvements to the vehicle body side component (suspension device (knuckle)), but a machining process is required when caulking the outer ring of the bearing unit. There is a limit to reducing the manufacturing cost of itself.

Therefore, it is desired to develop a low-cost bearing unit that can securely fix the vehicle body side component and the bearing unit to each other while using the vehicle body side component as it is. Is not known.
US6112411 US2003 / 0107259A1

  The present invention has been made in order to meet such a demand, and the object thereof is low cost capable of firmly fixing the vehicle body side component and the bearing unit to each other while using the vehicle body side component as it is. It is to provide a bearing unit.

  In order to achieve such an object, the present invention is directed to an annular stationary wheel having an annular fitting peripheral surface that can be fitted to a component peripheral surface of a vehicle body side component, and the stationary wheel. A bearing unit comprising an annular rotating wheel that is connected to the wheel and rotates together, and a plurality of rolling elements that are rotatably mounted between the stationary wheel and the rotating wheel. A fixing mechanism is provided that can fix the stationary wheel to the vehicle body side component when the product peripheral surface and the fitting peripheral surface are fitted together. The fixing mechanism includes a concave groove formed by partially recessing the fitting peripheral surface, an elastic member accommodated in the concave groove in a state of being elastically deformable outwardly of the concave groove, and a component peripheral surface. And a receiving groove that is partially recessed and can receive a part of the elastic member. In this case, when the fitting peripheral surface and the component peripheral surface are fitted, the elastic member accommodated in the concave groove partially enters the receiving groove by its elastic force, so that the vehicle body side component and the bearing unit And fix each other.

  In the present invention, the fixing mechanism includes, on at least one side of the groove, a seal groove formed by partially recessing the fitting peripheral surface along the circumferential direction, and an O-ring accommodated in the seal groove. Also good. In this case, a part of the O-ring protrudes from the seal groove in a state of being accommodated in the seal groove, and when the fitting peripheral surface and the component peripheral surface are fitted, the seal groove and the configuration are formed. Press contact with the product surface.

  In the present invention, the fixing mechanism includes, on at least one side of the groove, a mold groove formed by partially recessing the fitting peripheral surface along the circumferential direction, and a resin member molded in the mold groove. Also good. In this case, when the resin member is molded in the mold groove, a part of the resin member protrudes from the mold groove, and when the fitting peripheral surface and the component peripheral surface are fitted, the fitting peripheral surface is It is fitted to the peripheral surface of the component through a resin member.

  In the present invention, the fixing mechanism may include a recessed region formed by recessing a part of the fitting peripheral surface, and a resin member molded in the recessed region. In this case, the resin member is molded in the recessed area, and a part of the resin member protrudes from the recessed area, and the recessed groove is formed by partially recessed the resin member protruding from the recessed area. When the fitting peripheral surface is fitted to the component peripheral surface, the fitting peripheral surface is fitted to the component peripheral surface via the resin member.

  In the present invention, the fixing mechanism may be provided with a detent structure for preventing relative rotation between the stationary wheel and the vehicle body side component between the fitting peripheral surface and the component peripheral surface. In this case, the anti-rotation structure includes an anti-rotation groove formed by partially recessing the fitting peripheral surface, and an anti-rotation member housed in the anti-rotation groove in a state of partially protruding from the anti-rotation groove. And a fitting groove into which a part of the rotation preventing member can be fitted, and when the fitting peripheral surface and the component peripheral surface are fitted, The rotation preventing member housed in the stop groove is partially inserted into the fitting groove, thereby preventing relative rotation between the stationary wheel and the vehicle body side component.

  In the present invention, the anti-rotation structure includes an uneven groove formed on the fitting peripheral surface along a direction crossing the rotational direction of the rotating wheel, and an uneven surface formed on the component peripheral surface so as to mesh with the uneven groove. A groove may be provided. In this case, when the fitting peripheral surface and the component peripheral surface are fitted, both the concave and convex grooves are engaged with each other to prevent relative rotation between the stationary wheel and the vehicle body side component.

  In the present invention, the fixing mechanism is provided with a guide surface for guiding the elastic member toward the concave groove when the fitting peripheral surface and the component peripheral surface are fitted, and the guide surface is A part of the circumferential surface of the component is inclined at a predetermined angle along the circumferential direction.

  According to the present invention, it is possible to realize a low-cost bearing unit capable of firmly fixing the vehicle body side component and the bearing unit to each other while using the vehicle body side component as it is.

Hereinafter, a bearing unit according to an embodiment of the present invention will be described with reference to the accompanying drawings. The bearing units include those for driving wheels and driven wheels. Here, a bearing unit for driving wheels will be described as an example.
As shown in FIG. 1 (a), the bearing unit of the present embodiment is opposed to a stationary wheel (outer ring) 2 that is fixed to a vehicle body side component and is always kept in a non-rotating state, and to the inside of the stationary wheel 2. The rotating wheel (inner ring) 4 connected to the wheel and rotating together, and a plurality of rolling elements rotatably incorporated in a double row (for example, two rows) between the stationary wheel 2 and the rotating wheel 4 6 and 8. The stationary wheel 2 has a hollow cylindrical shape, and is disposed so as to cover the outer periphery of the rotating wheel 4.

  In this case, as the vehicle body side component, for example, a suspension device (knuckle) or various adapters can be applied. Here, the suspension device (knuckle) 20 is assumed. The stationary wheel 2 has an annular fitting peripheral surface 2m that can be fitted to an annular component peripheral surface 20m formed on the knuckle 20. Further, a seal member (pack seal 10a on the vehicle body side, lip seal 10b on the wheel side) for sealing the inside of the bearing unit is provided between the stationary wheel 2 and the rotating wheel 4. In the drawings, balls are illustrated as the rolling elements 6 and 8, but rollers may be applied depending on the configuration and type of the bearing unit.

  The rotating wheel (inner ring) 4 is provided with a substantially cylindrical hub 12 that rotates together with, for example, a disc wheel (not shown) of an automobile, and the hub 12 has a hub flange to which the disc wheel is fixed. 12a is protrudingly provided. The hub flange 12a extends outward (radially outward of the hub 12) beyond the stationary ring 2, and a plurality of hub flanges 12a are arranged at predetermined intervals along the circumferential direction in the vicinity of the extended edge. Hub bolts 14 are provided. In this case, by inserting a plurality of hub bolts 14 into bolt holes (not shown) formed in the disc wheel and tightening with hub nuts (not shown), the disc wheel can be positioned and fixed with respect to the hub flange 12a. it can. At this time, positioning in the radial direction of the wheel is performed by a pilot portion 12d protruding from the wheel side of the hub 12.

  The hub 12 (rotating wheel 4) is fitted (externally fitted) with an annular rotating wheel component 16 (a member constituting the rotating wheel 4 together with the hub 12) on the vehicle body side. In this case, for example, in a state where a plurality of rolling elements 6 and 8 are interposed between the stationary wheel 2 and the rotating wheel 4 (specifically, each rolling element 6 and 8 is held by the cage 18), After the rotating wheel component 16 is fitted (externally fitted) to the step 12b formed on the hub 12, the caulking region 12c at the vehicle body side end of the hub 12 is plastically deformed to rotate the caulking region 12c. By caulking (adhering) along the ring component 16, the rotating wheel component 16 can be fixed to the rotating wheel 4 (hub 12).

  At this time, a predetermined preload is applied to the bearing unit. In this state, the rolling elements 6 and 8 form a predetermined contact angle with each other and the raceway surfaces of the stationary wheel 2 and the rotating wheel 4 (see The reference numerals are omitted), and they are rotatably mounted in contact with each other. In this case, an action line (not shown) connecting the contact points intersects with each raceway surface, passes through the centers of the rolling elements 6 and 8, and intersects at one point (action point) on the center line of the bearing unit. This constitutes a rear combination (DB) bearing.

  In such a configuration, all of the force acting on the wheel during traveling of the vehicle is transmitted from the disk wheel to the suspension device through the bearing unit. At that time, various loads (radial loads) are applied to the bearing unit. , Axial load, moment load, etc.). However, since the bearing unit is a back combination (DB) bearing as described above, high rigidity is maintained with respect to various loads.

  Further, a constant velocity joint (CVJ) is connected to the bearing unit described above. In this case, in the state where the spline shaft 22 of the constant velocity joint CVJ is fitted in the spline hole 4h of the bearing unit (rotating wheel 4), the constant velocity joint outer ring 24 contacts the caulking region 12c of the bearing unit (rotating wheel 4). In addition, the constant velocity joint (CVJ) can be connected to the bearing unit by fastening the fitting tip of the spline shaft 22 to the pilot portion 12d with the nut 26.

  In addition, an inner ring 28 for constant velocity joint arranged opposite to the outer ring 24 is provided inside the outer ring 24 for constant velocity joint, and a plurality of balls 30 are held between the outer inner rings 24 and 28. In a state of being held at 32, it is movably interposed. Further, a spline hole 28h into which a drive shaft (not shown) connected to a drive source (engine) is fitted is formed at the center of the constant velocity joint inner ring 28.

  In such a configuration, the drive shaft fitted in the constant velocity joint inner ring 28 can be driven to rotate at an arbitrary angle by rolling a plurality of balls 30 between the outer inner rings 24 and 28. As a result, for example, the constant velocity joint (CVJ) freely changes in angle in response to the change in the angle of the drive shaft, so that the driving force of the predetermined torque output from the drive source (engine) is transmitted via the bearing unit. Smooth transmission to the disc wheel.

Further, the bearing unit of the present embodiment is provided with a fixing mechanism capable of fixing the stationary wheel 2 to the knuckle 20 when the component peripheral surface 20m and the fitting peripheral surface 2m are fitted. ing.
The fixing mechanism includes a concave groove G1 formed by partially recessing the fitting circumferential surface 2m, and an elastic member 34 accommodated in the concave groove G1 in a state in which it can be elastically deformed outward of the concave groove G1. It is provided with a receiving groove 20g which is formed by partially recessing the component peripheral surface 20m and which can receive a part of the elastic member 34. As the elastic member 34, for example, a substantially C-shaped ring in which a part of a thin disk (not shown) is cut out to give an overall elastic force, or an elastic force by a spring (not shown) is applied. Although an arcuate member or the like made can be applied, a substantially C-shaped ring is assumed here as an example.

  Further, the fixing mechanism is provided with a guide surface 20t for guiding the elastic member 34 toward the concave groove G1 when the fitting peripheral surface 2m and the component peripheral surface 20m are fitted. The guide surface 20t is formed on the fitting tip side when the component peripheral surface 20m is fitted to the fitting peripheral surface 2m, and a part of the component peripheral surface 20m on the fitting tip side is along the circumferential direction. And inclined at a predetermined angle. In this case, the guide surface 20t is configured to incline in a divergent shape toward the fitting tip side from the component peripheral surface 20m. In addition, since the inclination angle of the guide surface 20t is arbitrarily set according to, for example, the shape and size of the fitting distal end side of the component peripheral surface 20m, the shape and size of the elastic member 34, etc. Then there is no particular limitation.

Here, the process of fixing the bearing unit (stationary wheel 2) to the knuckle 20 will be described with reference to FIGS.
First, as shown in FIG. 1B, in a state where the fitting peripheral surface 2m of the stationary wheel 2 and the component peripheral surface 20m of the knuckle 20 are aligned, for example, the fitting peripheral surface 2m is replaced with the component peripheral surface 20m. Are slid in the direction of the arrow S along and fitted. In this state, the elastic member 34 is maintained in a state in which a part thereof protrudes from the concave groove G1 by its own elastic force. When the fitting peripheral surface 2m is further slid in the direction of arrow S along the component peripheral surface 20m, the guide surface 20t formed on the fitting distal end side of the component peripheral surface 20m eventually contacts the elastic member 34. Touch.

  In this state, when the fitting peripheral surface 2m is further slid along the component peripheral surface 20m in the arrow S direction, the elastic member 34 is pressed along the guide surface 20t as shown in FIG. Thus, it is accommodated in the concave groove G1 against its own elastic force. In this case, for example, by finishing the guide surface 20t smoothly, the elastic member 34 can be smoothly pressed along the guide surface 20t.

  As described above, the elastic member 34 pressed along the guide surface 20t is eventually pressed by the component peripheral surface 20m continuous to the guide surface 20t as shown in FIG. The state accommodated in the groove G1 is maintained. In this state, since the elastic member 34 is avoided at a position that does not affect the fitting operation between the fitting peripheral surface 2m and the component peripheral surface 20m, the fitting peripheral surface 2m is changed to the component peripheral surface 20m. Along the direction of the arrow S.

  Then, as shown in FIG. 1 (e), when the fitting peripheral surface 2m is further slid along the component peripheral surface 20m in the arrow S direction, the receiving groove 20g of the component peripheral surface 20m faces the concave groove G1. To do. In this case, the elastic member 34 pressed by the component peripheral surface 20m is released in the direction of the receiving groove 20g, and as a result, the elastic member 34 partially enters the receiving groove 20g by its own elastic force. . At this time, the fitting peripheral surface 2m and the component peripheral surface 20m are prevented from coming off by the elastic member 34 and are in a state of being fitted to each other. Thereby, the stationary wheel 2 and the knuckle 20 are positioned and fixed to each other.

  As described above, according to the present embodiment, the suspension device (knuckle) 20 that is the vehicle body side component only needs to be formed with the receiving groove 20g on the component peripheral surface 20m, and thus the knuckle 20 is greatly improved. It is not necessary and can be used as it is. Also, the fitting peripheral surface 2m is slid along the component peripheral surface 20m in the direction of arrow S, and the fitting peripheral surface 2m and the component peripheral surface 20m are prevented from coming off by the elastic member 34. Thus, the knuckle 20 and the bearing unit (stationary wheel 2) can be firmly fixed to each other. For this reason, another fitting mechanism is not required separately at the time of fitting. Thereby, a low-cost bearing unit can be realized as compared with the conventional case.

  Further, when fitting the fitting peripheral surface 2m to the component peripheral surface 20m, in order to prevent excessive pressure from being applied to the bearing unit (for example, the stationary wheel 2, the rotating wheel 4, and the rolling elements 6, 8). For example, it is preferable to provide a press-fitting reference surface 2a (FIG. 1 (a)) on the stationary wheel (outer ring) 2, press it with a predetermined jig, and monitor the pressing amount. Thereby, the elastic member 34 accommodated in the concave groove G1 can be surely entered into the receiving groove 20g. In this case, in order to perform reliable monitoring, the press-fitting reference surface 2a needs to be a flat surface, and a similar flat surface (not shown) is provided on the knuckle 20 side to support the pressure at the time of fitting. Is preferred.

In addition, this invention is not limited to embodiment mentioned above, It is good also as a structure like the following each modification.
In the bearing unit shown in FIG. 2 (a) as a first modification, the fixing mechanism has at least one recess of the fitting peripheral surface 2m along the circumferential direction on one side of the concave groove G1 of the stationary ring 2. And the O-ring 36 accommodated in the seal groove G2. Further, the O-ring 36 is maintained in a state in which a part of the O-ring 36 protrudes from the seal groove G2 while being accommodated in the seal groove G2. The material of the O-ring 36 can be arbitrarily set according to the usage environment and purpose of the bearing unit, such as a rubber material, a resin material, and a metal material.

  According to the first modification, when the fitting peripheral surface 2m and the component peripheral surface 20m of the knuckle 20 are fitted together as in the above-described embodiment, the O-ring 36 is connected to the seal groove G2. Press contact with the peripheral surface 20m of the component. Thus, for example, in a use environment of the bearing unit, foreign matters (for example, water, water vapor, and dust) outside the bearing are prevented from entering the bearing from between the fitting peripheral surface 2m and the component peripheral surface 20m. Can do. In this case, the elastic member 34 can be protected from, for example, rust and wear, and as a result, the fixed state of the knuckle 20 and the bearing unit (stationary wheel 2) can be stably maintained over a long period of time.

  In the first modification, the drawing shows a configuration example in which one seal groove G2 is formed on each side of the groove G1, but instead, for example, a plurality of seal grooves G2 are formed on both sides of the groove G1. The seal groove G2 may be formed, or one seal groove G2 may be formed on one side and a plurality of seal grooves G2 may be formed on the opposite side. Further, for example, a lubricant or a rust preventive material may be enclosed in the seal groove G2. Thereby, durability of the elastic member 34 and the ditch | groove G1 can be improved.

  In the bearing unit shown in FIG. 2 (b) as the second modification, the fixing mechanism is formed on at least one side of the concave groove G1 with the fitting peripheral surface 2m partially recessed along the circumferential direction. A mold groove G3 and a resin member 38 molded in the mold groove G3 are provided. In addition, the resin member 38 is maintained in a state where a part of the resin member 38 protrudes from the mold groove G3 while being molded in the mold groove G3. The material of the resin member 38 can be arbitrarily set according to the use environment and purpose of the bearing unit as long as it can be molded, such as Duracon (registered trademark) or MC nylon (registered trademark).

  According to the second modification, when the fitting peripheral surface 2m and the component peripheral surface 20m are fitted together as in the above-described embodiment, the fitting peripheral surface 2m is interposed via the resin member 38. And is fitted to the component peripheral surface 20m. Thereby, the wear accompanying the relative sliding of the knuckle 20 and the bearing unit (stationary wheel 2) can be prevented. As a result, the fixed state between the knuckle 20 and the bearing unit (stationary wheel 2) can be stably maintained over a long period of time.

  In the second modification, the drawing shows a configuration example in which one mold groove G3 is formed on each side of the groove G1, but instead, for example, a plurality of mold grooves G1 are formed on both sides of the groove G1. The mold groove G3 may be formed, or one mold groove G3 may be formed on one side and a plurality of mold grooves G3 may be formed on the opposite side.

  In the bearing unit shown in FIG. 2 (c) as a third modification, the fixing mechanism is molded into a recessed region G4 formed by recessing a part of the fitting peripheral surface 2m, and the recessed region G4. And a resin member 40. In addition, the resin member 40 is partially molded from the indented region G4 in a state of being molded in the indented region G4. In this case, the recessed groove G1 is formed by partially recessing the resin member 40 protruding from the recessed region G4. In addition, if the material of the resin member 40 is a material which can be molded, such as Duracon (registered trademark) or MC nylon (registered trademark), it can be arbitrarily set according to the use environment and purpose of the bearing unit.

  According to the third modification, when the fitting peripheral surface 2m and the component peripheral surface 20m are fitted together as in the above-described embodiment, the fitting peripheral surface 2m is interposed via the resin member 40. And is fitted to the component peripheral surface 20m. As a result, wear due to relative sliding between the knuckle 20 and the bearing unit (stationary wheel 2) can be prevented, and the resin member 40 functions as a damper during relative sliding. Sound) can be prevented.

  In the bearing unit shown in FIG. 2D as the fourth modification, the fixing mechanism includes a relative rotation between the stationary wheel 2 and the knuckle 20 between the fitting peripheral surface 2m and the component peripheral surface 20m. An anti-rotation structure is provided to prevent this. Here, the anti-rotation structure includes the anti-rotation groove G5 formed by partially recessing the fitting peripheral surface 2m, and the anti-rotation housed in the anti-rotation groove G5 in a state of partially protruding from the anti-rotation groove G5. A member 42 and a fitting groove G6 that is formed by partially recessing the component peripheral surface 20m and into which a part of the rotation preventing member 42 can be fitted are provided.

  For example, a raw ball (non-heat treated ball) can be used as the rotation preventing member 42. In this case, the diameter dimension of the rotation preventing groove G5 is 0.005 to 0.005 larger than the diameter of the raw ball 42. It is preferable to set it as small as about 03 mm. Thereby, the raw ball 42 can be fixed to the non-rotating groove G5. The fitting groove G6 is preferably formed along the fitting direction.

  According to the fourth modified example, the anti-rotation member 42 accommodated in the anti-rotation groove G5 when the fitting peripheral surface 2m and the component peripheral surface 20m are fitted as in the above-described embodiment. Is partially inserted into the fitting groove G6. Thereby, the relative rotation of the knuckle 20 and the bearing unit (stationary wheel 2) can be prevented. In this case, for example, in a bearing unit that does not have a built-in sensor, a slight revolving phenomenon of the stationary ring 2 can be allowed, but in a sensor built-in type bearing, it cannot be allowed to prevent disconnection of the sensor cable. Therefore, by providing a detent structure as in this modification, it is possible to cope with a sensor built-in type bearing.

  In the bearing unit shown in FIG. 2 (e) as the fifth modification, the fixing mechanism includes a relative rotation between the stationary wheel 2 and the knuckle 20 between the fitting peripheral surface 2m and the component peripheral surface 20m. An anti-rotation structure is provided to prevent this. Here, the non-rotating structure engages with the concave and convex groove G7 formed on the fitting peripheral surface 2m along the direction crossing the rotational direction of the rotating wheel 4 (FIG. 1A) and the concave and convex groove G7. Are provided with a concavo-convex groove G8 formed in the peripheral surface 20m of the component. For example, the concave and convex grooves G7 and G8 are formed by, for example, subjecting the fitting peripheral surface 2m to serration processing to form the concave and convex groove G7, and subjecting the component peripheral surface 20m to knurling and processing the concave and convex grooves. G8 may be formed.

  According to the fifth modification, when the fitting peripheral surface 2m and the component peripheral surface 20m are fitted together as in the above-described embodiment, the both concave and convex grooves G7 and G8 are engaged with each other. The relative rotation between the knuckle 20 and the bearing unit (stationary wheel 2) can be prevented. Since other effects are the same as those of the above-described fourth modified example, description thereof is omitted.

  The first to fifth modifications described above may be applied individually to the bearing unit (FIG. 1A) or may be applied in any combination. For example, the first modification and the second modification can be combined and applied to the bearing unit, or all the configurations of the first to fifth modifications can be combined and applied to the bearing unit. .

  Furthermore, in the above-described embodiment and each modification, the suspension device (knuckle) 20 is assumed as a vehicle body side component for fixing the stationary wheel (outer ring) 2, but instead of this, a stationary wheel ( An adapter for fixing the outer ring 2 may be a vehicle body side component. Thereby, for example, the replacement cost when the bearing is broken can be reduced.

(a) is sectional drawing which shows the whole structure of the bearing unit which concerns on one embodiment of this invention, (b)-(e) is a figure which shows the process which fixes a suspension apparatus to a bearing unit. (a) is sectional drawing which expands partially and shows the structure of the bearing unit which concerns on the 1st modification of this invention, (b) is a structure of the bearing unit which concerns on the 2nd modification of this invention. Sectional drawing which expands and shows a part, (c) is sectional drawing which expands partially and shows the structure of the bearing unit which concerns on the 3rd modification of this invention, (d) is the 4th modification of this invention Sectional drawing which expands and partially shows the structure of the bearing unit which concerns on this, (e) is sectional drawing which expands and partially shows the structure of the bearing unit which concerns on the 5th modification of this invention. Sectional drawing which shows the structure of the conventional bearing unit roughly.

Explanation of symbols

2 Stationary wheel 2m Fitting peripheral surface 4 Rotating wheel 20 Car body side component (knuckle)
20g Receiving groove 20m Peripheral surface 34 of component product Elastic member G1 Concave groove

Claims (8)

An annular stationary wheel formed with an annular fitting peripheral surface that can be fitted to a component peripheral surface of the vehicle body side component, and an annular ring that is provided opposite the stationary wheel and connected to the wheel and rotates together Bearing unit, and a plurality of rolling elements that are rotatably incorporated between a stationary wheel and a rotating wheel,
A fixing mechanism capable of fixing the stationary wheel to the vehicle body side component when the component peripheral surface and the fitting peripheral surface are fitted is provided.
The fixing mechanism includes a concave groove formed by partially recessing the fitting peripheral surface, an elastic member accommodated in the concave groove in a state of being elastically deformable outwardly of the concave groove, and a component peripheral surface. A receiving groove formed to be partially recessed and capable of receiving a part of the elastic member,
When the fitting peripheral surface and the component peripheral surface are fitted, the elastic member housed in the concave groove partially enters the receiving groove by its elastic force, so that the vehicle body side component and the bearing unit are mutually connected. Bearing unit that can be positioned and fixed. The fixing mechanism includes, on at least one side of the groove, a seal groove formed by partially recessing the fitting peripheral surface along the circumferential direction, and an O-ring accommodated in the seal groove,
A part of the O-ring protrudes from the seal groove in a state of being accommodated in the seal groove, and when the fitting peripheral surface and the component peripheral surface are fitted, the seal groove and the component peripheral surface The bearing unit according to claim 1, wherein the bearing unit is in pressure contact with each other. The fixing mechanism includes at least one side of the concave groove, a mold groove formed by partially recessing the fitting peripheral surface along the circumferential direction, and a resin member molded in the mold groove,
A part of the resin member protrudes from the mold groove in a state of being molded in the mold groove.
The bearing according to claim 1, wherein when the fitting peripheral surface and the component peripheral surface are fitted, the fitting peripheral surface is fitted to the component peripheral surface via a resin member. unit. The fixing mechanism includes a recessed region formed by recessing a part of the fitting peripheral surface, and a resin member molded in the recessed region,
The resin member is molded in the recessed area, and a part of the resin member protrudes from the recessed area, and the recessed groove is formed by partially recessed the resin member protruding from the recessed area,
The bearing according to claim 1, wherein when the fitting peripheral surface and the component peripheral surface are fitted, the fitting peripheral surface is fitted to the component peripheral surface via a resin member. unit.   The anti-rotation structure which prevents relative rotation of a stationary wheel and a vehicle body side component is provided in the fixing mechanism between the fitting peripheral surface and the component peripheral surface. 4. The bearing unit according to claim 1. The detent structure includes a detent groove formed by partially recessing the fitting peripheral surface, a detent member housed in the detent groove in a state of partially protruding from the detent groove, and a component peripheral surface And a fitting groove into which a part of the detent member can be fitted.
When the fitting peripheral surface and the component peripheral surface are fitted to each other, the rotation preventing member housed in the rotation preventing groove is partially inserted into the fitting groove, so that the stationary wheel and the vehicle body side component are relatively The bearing unit according to claim 5, wherein rotation is prevented. The anti-rotation structure includes an uneven groove formed on the fitting peripheral surface along a direction crossing the rotation direction of the rotating wheel, and an uneven groove formed on the peripheral surface of the component so as to mesh with the uneven groove. With
6. The relative rotation between the stationary wheel and the vehicle body side component is prevented by engaging the concave and convex grooves when the fitting peripheral surface and the component peripheral surface are engaged with each other. The bearing unit described in.   The fixing mechanism is provided with a guide surface for guiding the elastic member toward the concave groove when the fitting peripheral surface and the component peripheral surface are fitted, and the guide surface is a component peripheral surface. The bearing unit according to claim 1, wherein a part of the bearing unit is inclined at a predetermined angle along a circumferential direction.

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