JP2003056572A - Bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device, such as a vehicle hub unit, capable of imparting sufficient pre-load to balls 34, 35 when pressing into hollow shaft portion 2 inner and outer rings each having a protruding portion 6, formed by applying chamfering to an axial end face. SOLUTION: A chamfered portion 7 is formed on the axial end face 32a of the inner ring 32, while the protruding portion 6 is left abutting against an abutment face 2a of the hollow shaft portion 2, and a boundary 9 between the protruded portion 6 and the chamfer portion 7 is formed as a slope sloping outwardly to the axial end face 32a in the radial direction. A sloping angle θis set at 50 deg.<=θ<=80 deg. and R1 <R2 is established, where R1 is the radius of a recessed curve 5a of the hollow shaft portion 2 and R2 is the radius of a protruded curve 32b of the inner ring 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device such as a vehicle hub unit.

[0002]

2. Description of the Related Art FIG. 13 shows an example of a drive wheel hub unit.

In FIG. 13, reference numeral 1 denotes a hub wheel to which a wheel is attached. An axle (not shown) is spline-fitted to a hollow shaft portion 2 which serves as a rotating shaft of the hub wheel 1 and fixed by a nut. .

On the outer peripheral surface of the hollow shaft portion 2, a double row bearing 3 made of an angular ball bearing is press-fitted from the inner side of the vehicle and is externally fitted. The double-row bearing 3 includes a pair of inner rings 31, 32, an outer ring 33 fixed to the vehicle body through a steering knuckle, a plurality of balls 34, 35 arranged along the orbits of the inner rings 31, 32, balls 34 in each row, It is composed of holders 36 and 37 holding 35. In addition,
The inner ring 31 on the vehicle outer side is integrally formed on the outer peripheral surface of the hollow shaft portion 2.

The inner ring 32 is formed by bending and bending the end portion of the hollow shaft portion 2 on the vehicle inner side toward the outside in the radial direction and caulking it.
The ball 3 is held by the caulking portion 4 and the hollow shaft portion 2.
With the preload applied to 4, 35, the double-row bearing 3 is prevented from coming off in the axial direction.

[0006]

FIG. 14 is a schematic diagram of FIG.
The enlarged view of a part is shown.

Conventionally, the inner ring 32 is press-fitted into the annular recess 5 formed on the outer peripheral surface of the hollow shaft portion 2 in the direction of arrow P from the vehicle inner side, and the inner shaft 32 of the hollow shaft portion 2 is caulked, whereby the inner ring is formed. The axial end surface 32a of 32 comes into pressure contact with the contact surface 2a extending in the radial direction of the annular recess 5 and preload is applied to the balls 34, 35.

However, the corner 5a of the annular recess 5 has a radius R
_It is formed on the concave curved surface of ₁ , and the projected corner portion 32b of the inner ring 32
Is formed on a convex curved surface with a radius R ₂ , so if R ₁ and R ₂ are not equal, when the inner ring 32 is pressed into the annular recess 5,
A gap is generated between the annular recess 5 and the inner ring 32, and the balls 34,
There was a problem that sufficient preload was not applied to 35.

Therefore, as shown in FIG. 15, the protrusion 6 is formed on the raceway side of the axial end surface 32a of the inner ring 32, and the protrusion 6 is pressed against the contact surface 2a of the annular recess 5,
It is conceivable to apply sufficient preload to the balls 34, 35 without being affected by the dimensions of R ₁ and R ₂ .

The projecting portion 6 is an axial end surface 32a of the inner ring 32.
It is formed by polishing and chamfering. The chamfered portion 7 is formed by an angle of 90 ° with respect to the contact surface 2a, that is, a step portion 7a extending in the axial direction.

However, when the step portion 7a is formed at an angle of 90 ° with respect to the contact surface 2a, the burr 8 is likely to be formed from the axial end surface 32a of the protrusion 6 to the step portion 7a during polishing. Become. When the burr 8 is generated on the stepped portion 7a, when the inner ring 32 is press-fitted into the annular recess 5, the burr 8 enters between the axial end surface 32a of the protrusion 6 and the contact surface 2a, and the inner ring 32 and the annular recess 5a. There is a gap between 5 and the ball 3
There arises a problem that sufficient preload is not applied to 4,35.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a bearing device capable of applying a sufficient preload to a rolling element when an inner and outer ring having an axial end surface chamfered to form a protrusion is press-fitted into a holding member. .

[0013]

According to a first aspect of the present invention, there is provided an inner ring, an outer ring, a rolling element provided between the inner ring and the outer ring, and one of the inner ring and the outer ring, which holds one of the inner ring and the outer ring. A holding member having a contact surface that extends in the radial direction with which the axial end surface of the wheel contacts, and a fastening unit that fixes the one inner and outer ring to the holding member, and the fastening unit uses the one In the bearing device in which the axial end surfaces of the inner and outer races are pressed against the contact surface of the holding member to apply a preload to the rolling elements, the axial end surfaces of the one inner and outer race contact the contact surface. A chamfer is formed by leaving the contacting protrusion, and the boundary surface between the protrusion and the chamfer is an inclined surface that is inclined radially outward toward the axial end surface, and the inclination angle θ is 50 ° ≦. It is characterized in that θ ≦ 80 °.

According to the bearing device of the first aspect of the present invention, by forming the projection portion that abuts the abutment surface of the holding member on the axial end surface of the one inner / outer ring, the one inner / outer ring is formed by the fastening means. The holding member is brought into pressure contact with the rolling element, so that a sufficient preload can be applied to the rolling element. Moreover, the boundary surface between the protrusion and the chamfer formed on the axial end surface of the inner and outer races is an inclined surface that is inclined radially outward toward the axial end surface, so that the axial end surface is polished. When the chamfered portion is formed, no burr is generated on the boundary surface, and the protruding portion closely contacts the contact surface, so that sufficient preload can be applied to the rolling element. Furthermore, by setting the inclination angle θ of the boundary surface between the protruding portion and the chamfered portion to be 50 ° ≦ θ ≦ 80 °, it is possible to reduce the amount of change in the radial width dimension of the protruding portion due to an error during polishing, and thus the contact surface It is possible to secure a sufficient contact area with and to prevent a burr on the boundary surface and to apply a sufficient preload to the rolling elements.

It should be noted that the chamfer side end of the boundary surface between the protrusion and the chamfer may be a concave curved surface. By doing so, the boundary surface and the chamfered portion are smoothly connected, stress is not concentrated on the chamfered portion side end portion of the boundary surface, and the bearing can be prevented from being damaged.

A bearing device according to claim 2 of the present invention comprises an inner ring,
An outer race, a rolling element provided between the inner and outer races, a holding member that holds one of the inner and outer races, and has a contact surface that extends in the radial direction with which the axial end surface of the one inner and outer race contacts. And a fastening means for fixing the inner and outer rings to the holding member, wherein the fastening means presses the axial end faces of the inner and outer rings into contact with the abutting face of the holding member to bring the rolling element into contact with the rolling element. In a bearing device provided with a preload, a chamfered portion is formed on an axial end surface of the one inner / outer ring, leaving a protruding portion that contacts the contact surface, and the chamfered portion is connected to the protruding portion. A first inclined surface which is inclined radially outward toward the axial end surface, and a second inclined surface which is connected to the first inclined surface via a convex curved surface and is inclined radially outward toward the axial end surface. And the inclination angle θ of the first inclined surface is 10 ° ≦ θ ≦ 30 ° A.

According to the bearing device of the second aspect of the present invention, by forming a protrusion on the axial end surface of the one inner / outer ring so as to abut against the abutment surface of the holding member, the one inner / outer ring can be formed by the fastening means. The holding member is brought into pressure contact with the rolling element, so that sufficient preload can be applied to the rolling element. Moreover, the first inclined surface connected to the protruding portion of the chamfered portion formed on the axial end surface of the one inner / outer ring is an inclined surface that is radially outwardly inclined toward the axial end surface. When the chamfered portion is polished to form a chamfer, the first inclined surface does not have a burr and the protruding portion closely contacts the contact surface, so that sufficient preload can be applied to the rolling element. Furthermore, the first
By setting the inclination angle θ of the inclined surface to be 10 ° ≦ θ ≦ 30 °, it is possible to prevent the axial end faces of one of the inner and outer rings from abutting against the abutting face, and to give a sufficient preload to the rolling elements. It is possible to prevent the bearing device from increasing in size.

The bearing device according to claim 3 of the present invention comprises an inner ring,
An outer ring, a rolling element provided between the inner and outer rings, a holding member that holds one of the inner and outer rings, and a fastening unit that fixes one inner and outer ring held by the holding member to the holding member. The holding member is connected to an axially extending holding surface that holds the one inner / outer ring, and extends in a radial direction in which the axially end surface of the one inner / outer ring contacts the holding surface via a concave curved surface. An abutting surface, a convex curved surface facing the concave curved surface of the holding member is formed on the axial end surface of the one inner / outer ring, and the axial end surface of the one inner / outer ring is formed by the tightening means. In a bearing device in which a contact surface of the holding member is pressed to apply a preload to the rolling element, a chamfer is formed on the axial end surface of the one inner / outer ring, leaving a protruding portion that contacts the contact surface. Forming a part,
A boundary surface between the projecting portion and the chamfered portion is an inclined surface that is inclined radially outward toward the axial end surface, and the inclination angle θ is 50 ° ≦ θ ≦ 80 °, and the radius R of the concave curved surface is set.
₁ and the radius R _{2 of the} convex curved surface are set such that R ₁ <R ₂ .

It should be noted that the chamfered portion side end of the boundary surface between the protruding portion and the chamfered portion may be a concave curved surface.

Also in the bearing device according to claim 3 of the present invention,
The same action as the bearing device according to the first aspect can be obtained. further,
By setting the radius R ₁ of the concave curved surface of the holding member and the radius R ₂ of the convex curved surface of the axial end faces of the one inner and outer rings to R ₁ <R ₂ ,
When the one inner and outer ring is press-fitted into the holding member, the protruding portion surely abuts the abutment surface, and sufficient preload can be applied to the rolling element.

A bearing device according to claim 4 of the present invention comprises an inner ring,
An outer ring, a rolling element provided between the inner and outer rings, a holding member that holds one of the inner and outer rings, and a fastening unit that fixes one inner and outer ring held by the holding member to the holding member. The holding member is connected to an axially extending holding surface that holds the one inner / outer ring, and extends in a radial direction in which the axially end surface of the one inner / outer ring contacts the holding surface via a concave curved surface. A bearing device having an abutment surface, wherein the tightening means presses the axial end surfaces of the one inner and outer rings against the abutment surface of the holding member to apply a preload to the rolling element. A chamfered portion is formed on the axial end surface of the one inner / outer ring, leaving a protruding portion that contacts the contact surface, and the chamfered portion is connected to the protruding portion and extends radially outward toward the axial end surface. And a first inclined surface that is inclined to the first inclined surface and is connected to the first inclined surface through a convex curved surface and faces the end surface in the axial direction. It consists of a second inclined surface inclined radially outward Te, the inclination angle θ of the first inclined surface, 10 °
≦ θ ≦ 30 °, and the radius R ₁ of the concave curved surface and the radius R _{3 of the} convex curved surface are R ₁ <R ₃ .

Also in the bearing device according to claim 4 of the present invention,
The same action as the bearing device according to the second aspect can be obtained. further,
By setting the radius R ₁ of the concave curved surface of the holding member and the radius R ₃ of the convex curved surface between the first inclined surface and the second inclined surface of the one inner / outer ring to be R ₁ <R ₃ , When the is pressed into the holding member, the protruding portion surely contacts the contact surface, and sufficient preload can be applied to the rolling element.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) Embodiment 1 of the present invention will be described with reference to FIGS.

The first embodiment relates to a bearing device composed of a drive wheel hub unit, and the structure of the hub unit is the same as that of the example shown in FIG. 13, and the same portions are designated by the same reference numerals. And its description is omitted.

FIG. 2 corresponds to an enlarged view of portion a of the hub unit shown in FIG.

An annular recess 5 is formed on the outer peripheral surface of the hollow shaft portion 2 serving as a holding member, and the annular recess 5 has an axially extending holding surface 2b for holding the inner ring 32 on the vehicle inner side,
The holding surface 2b is formed of a contact surface 2a that is connected to the holding surface 2b via a concave curved surface 5a and extends in the radial direction with which the axial end surface 32a of the inner ring 32 contacts.

Further, on the raceway side of the axial end surface 32a of the inner ring 32, a protruding portion 6 that contacts the contact surface 2a is formed.

The protrusion 6 is an axial end surface 32a of the inner ring 32.
It is formed by polishing and chamfering. The chamfered portion 7 is formed with a convex curved surface 32b facing the concave curved surface 5a of the hollow shaft portion 2. The radius R ₁ of the concave curved surface 5a of the hollow shaft portion 2 and the radius R ₂ of the convex curved surface 32b of the inner ring 32 are R ₁ <
There is a relationship of R ₂ .

A boundary surface 9 between the projecting portion 6 and the chamfered portion 7
Is an inclined surface that is inclined radially outward toward the axial end surface 32a. The inclination angle θ of the boundary surface 9 is 50
° ≦ θ ≦ 80 °.

Further, the end of the boundary surface 9 on the chamfered portion 7 side is a concave curved surface 10 and is smoothly connected to the chamfered portion 7. It should be noted that the concave curved surface 10 is formed naturally when the grinding stone for chamfering is large.

In FIG. 3, the inclination angle θ of the boundary surface 9 is 50 °.
The basis for setting ≦ θ ≦ 80 ° is shown.

As shown in FIG. 2, the vertical axis of the graph of FIG. 3 is A / B when the radial dimension A and the axial dimension B of the boundary surface 9 are set, that is, the radial direction with respect to the axial dimension B. The amount of change in the dimension A is shown. The horizontal axis represents the inclination angle θ of the boundary surface 9.

From FIG. 3, it can be seen that as the tilt angle θ increases, the amount of change in the radial dimension A with respect to the axial dimension B decreases. When the amount of change in the radial dimension A with respect to the axial dimension B decreases, the amount of change in the radial width dimension L of the protrusion 6 decreases due to an error during polishing. That is,
Radial width L of the protrusion 6 regardless of the error during polishing
Can be sufficiently secured, and the contact surface pressure between the protrusion 6 and the contact surface 2a can be reduced.

On the other hand, when the inclination angle θ becomes too large, for example, when θ = 90 °, burr occurs on the boundary surface 9 during polishing.

From the above, the ideal tilt angle θ is 5
0 ° ≦ θ ≦ 80 °.

According to the bearing device configured as described above,
The contact surface 2a of the hollow shaft portion 2 is attached to the axial end surface 32a of the inner ring 32.
By forming the protrusion 6 that abuts against the caulking portion 4,
The inner ring 32 and the hollow shaft portion 2 are brought into pressure contact with each other by the balls 34, 35.
A sufficient preload can be applied to

A boundary surface 9 between the protruding portion 6 and the chamfered portion 7
Is an inclined surface that is inclined radially outward toward the axial end surface 32a, so that when the axial end surface 32a is polished to form the chamfered portion 7, no burr occurs on the boundary surface 9, The protrusion 6 closely contacts the contact surface 2a, and the balls 34, 35
A sufficient preload can be applied to

Further, the inclination angle θ of the boundary surface 9 between the protrusion 6 and the chamfer 7 is set to 50 ° ≦ θ ≦ 80 °, so that the radial width dimension L of the protrusion 6 changes due to an error during polishing. The amount can be reduced, the contact area with the contact surface 2a can be sufficiently secured, and burr does not occur on the boundary surface 9, and sufficient preload can be applied to the balls 34, 35.

Further, since the chamfered portion 7 side end portion of the boundary surface 9 between the projecting portion 6 and the chamfered portion 7 is the concave curved surface 10, the boundary surface 9 and the chamfered portion 7 are smoothly connected, and the chamfering of the boundary surface 9 is performed. It is possible to prevent the bearing from being damaged because stress is not concentrated on the end portion on the side of the portion 7.

Further, the radius R of the concave curved surface 5a of the hollow shaft portion 2
₁ and the radius R ₂ of the convex curved surface 32b of the axial end surface 32a of the inner ring 32 are set to R ₁ <R ₂ , so that when the inner ring 32 is press-fitted into the annular recess 5 of the hollow shaft portion 2, the protrusion 6 Reliably contacts the contact surface 2a, and sufficient preload can be applied to the balls 34, 35.

The end of the boundary surface 9 on the chamfered portion 7 side is not the concave curved surface 10 but may be bent.

The bearing unit is not limited to the drive wheel hub unit, but may be applied to the driven wheel hub unit. (Embodiment 2) FIG. 4 shows Embodiment 2 of the present invention.
It will be described with reference to FIGS.

The second embodiment relates to a bearing device including the drive wheel hub unit shown in FIG. 1, and the same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

On the raceway side of the axial end surface 32a of the inner ring 32, there is formed a projecting portion 6 which comes into contact with the contact surface 2a.
The protrusion 6 is formed by polishing and chamfering the axial end surface 32a of the inner ring 32.

The chamfered portion 7 is connected to the protruding portion 6 and is connected to the first inclined surface 11 through the convex curved surface 13 and the first inclined surface 11 which is inclined radially outward toward the axial end surface 32a. The second inclined radially outward toward the direction end surface 32a
It is composed of an inclined surface 12. The first inclined surface 1
The inclination angle θ of 1 is 10 ° ≦ θ ≦ 30 °.

Further, the radius R ₁ of the concave curved surface 5a of the hollow shaft portion 2
And the radius R ₃ of the convex curved surface 13 of the inner ring 32 has a relationship of R ₁ <R ₃ .

FIG. 5 shows the inclination angle θ of the first inclined surface 11
The basis for setting 10 ° ≦ θ ≦ 30 ° will be shown.

As shown in FIG. 4, the vertical axis of the graph of FIG. 5 is C / D where the radial dimension C and the axial dimension D of the first inclined surface 11 are set, that is, the axial dimension D. The amount of change in the radial dimension C is shown. The horizontal axis represents the tilt angle θ of the first tilted surface 11.

From FIG. 5, when the tilt angle θ is small (for example, around θ = 0 °), the amount of change in the radial dimension C with respect to the axial dimension D becomes large. Therefore, as shown in FIG. 6, when the polishing allowance 14 is large, when the inner ring 32 is press-fitted into the hollow shaft portion 2, the abutting portion 15 of the hollow shaft portion 2 and the abutting portion 16 of the inner ring 32 abut each other. There is a risk that the protrusion 6 will not come into contact with the contact surface 2a, and sufficient preload will not be applied to the balls 34, 35.

On the other hand, if the inclination angle θ is large (for example, θ
= Around 45 °), the clearance of the chamfered portion 7 becomes large in the axial direction, the inner ring 32 becomes long in the axial direction, and the bearing device becomes large.

From the above, the ideal inclination angle θ is 10 ° ≦ θ ≦ 30 ° as a result of avoiding the case where the value of C / D suddenly increases is less than θ = 10 ° and considering miniaturization. .

According to the bearing device configured as described above,
The contact surface 2a of the hollow shaft portion 2 is attached to the axial end surface 32a of the inner ring 32.
By forming the protrusion 6 that abuts against the caulking portion 4,
The inner ring 32 and the hollow shaft portion 2 are brought into pressure contact with each other by the balls 34, 35.
A sufficient preload can be applied to

Further, the first inclined surface 11 connected to the projecting portion 6 in the chamfered portion 7 formed on the axial end surface 32a of the inner ring 32 is an inclined surface inclined radially outward toward the axial end surface 32a. Thus, when the chamfered portion 7 is formed by polishing the axial end surface 32a, the first inclined surface 11 does not have a burr, and the protrusion 6 closely contacts the contact surface 2a.
A sufficient preload can be applied to 4,35.

Further, the inclination angle θ of the first inclined surface 11 is set to 1
By setting 0 ° ≦ θ ≦ 30 °, it is possible to prevent the axial end surface 32a of the inner ring 32 from contacting the contact surface 2a, and the balls 34,
A sufficient preload can be applied to 35, and the bearing device can be prevented from increasing in size.

Further, the radius R of the concave curved surface 5a of the hollow shaft portion 2
_1, and the radius R ₃ of the convex curved surface 13 between the first inclined surface 11 and the second inclined surface 12 of the inner ring 32 is set to R ₁ <R ₃ , the inner ring 32 is formed into the annular recess 5 of the hollow shaft portion 2. When it is press-fitted in, the protrusion 6 surely contacts the contact surface 2a, and the balls 34, 3
5, a sufficient preload can be applied. (Embodiment 3) FIG. 7 shows Embodiment 3 of the present invention.
Through FIG. 9 will be described.

The third embodiment relates to a bearing device comprising a drive wheel hub unit having an inner ring 38 on the vehicle outer side, which is separate from the hollow shaft portion 2, and the same parts as those in FIG. 1 are designated by the same reference numerals. And its description is omitted.

FIG. 8 is an enlarged view of a portion b of the hub unit shown in FIG. 7, in which the chamfered portion 7 corresponding to the first embodiment is provided on the inner ring 32. In this case, the holding member that holds the inner ring 32 is the hollow shaft portion 2 and the inner ring 38 on the vehicle outer side, and the end surface of the inner ring 38 on the vehicle inner side is the inner ring 32.
Is the contact surface 38a with which the protruding portion 6 contacts. The configuration of the inclination angle θ of the boundary surface 9 and the like is similar to that of the first embodiment. The curvature of the convex curved surface 32b of the inner ring 32 is
Is formed to have the same curvature as that of the convex curved surface 38b facing each other.

Even in the case of such a configuration, the first embodiment
The same effect as can be obtained.

FIG. 9 is an enlarged view of a portion b of the hub unit shown in FIG. 7, in which the chamfered portion 7 corresponding to the second embodiment is applied to the inner ring 32. The configuration such as the inclination angle θ of the first inclined surface 11 is the same as that in the second embodiment. Also in the case of such a configuration, the same effect as that of the second embodiment can be obtained.

Further, the c portion of the hub unit shown in FIG. 7 may also be constructed in the same manner as the example shown in FIGS. That is, the chamfered portion 7 shown in FIGS. 2 and 4 is formed on the vehicle outer side end surface of the inner ring 38.

The configuration of the present invention is not limited to the one applied to the bearing device comprising the hub unit of each of the above-described embodiments, and for example, as shown in FIG. 10, the rolling elements are double-row tapered rollers. It may be applied to the d portion and the e portion of the hub unit provided with the bearing 3 composed of 34 and 35.

Further, the bearing device to be applied is not limited to the hub unit, but a single row bearing 100 consisting of angular ball bearings as shown in FIG. 11 or a bearing 110 combining two single row bearings as shown in FIG. May be applied to.

That is, in the bearing 100 shown in FIG. 11, balls 103 are interposed between the inner and outer rings 101 and 102, and the axial end face of the outer ring 102 contacts the holding member 104 at the f portion. The configuration shown in FIG. 4 is applied.
In addition, the bearing 110 shown in FIG.
Balls 115 and 116 are interposed between 2, 113 and 114, and the configuration shown in FIGS. 2 and 4 is applied to the g portion which is the butted portion of the axial end faces of the outer rings 112 and 114. is there.

As described above, the structure of the present invention can be applied not only to the hub unit but also to various bearing devices, and can be applied to both the inner ring and the outer ring.

[0065]

According to the bearing device of the present invention, when the inner and outer rings having the projections formed by chamfering the axial end faces are press-fitted into the holding member, a sufficient preload can be applied to the rolling elements. can get.

[Brief description of drawings]

FIG. 1 is a sectional view of a bearing device according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the bearing device according to the first embodiment of the present invention.

FIG. 3 is a graph showing the basis of the inclination angle of the boundary surface between the protrusion and the chamfer in the first embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a bearing device according to a second embodiment of the present invention.

FIG. 5 is a graph showing the basis of the inclination angle of the first inclined surface in the second embodiment of the present invention.

FIG. 6 is an explanatory diagram showing the basis of the inclination angle of the first inclined surface in the second embodiment of the present invention.

FIG. 7 is a sectional view of a bearing device according to a third embodiment of the present invention.

FIG. 8 is a partial cross-sectional view of a bearing device according to a third embodiment of the present invention.

FIG. 9 is a partial cross-sectional view of a bearing device according to a third embodiment of the present invention.

FIG. 10 is a cross-sectional view of a bearing device according to a modified example of the present invention.

FIG. 11 is a cross-sectional view of a bearing device according to a modified example of the present invention.

FIG. 12 is a cross-sectional view of a bearing device according to a modified example of the present invention.

FIG. 13 is a sectional view of a bearing device in a conventional example.

FIG. 14 is a partial cross-sectional view of a bearing device in a conventional example.

FIG. 15 is a partial cross-sectional view of a bearing device according to a conventional proposal example.

[Explanation of symbols]

2 Hollow shaft (holding member) 2a, 38a Contact surface 2b holding surface 3 bearings 4 Caulking part (fastening means) 5a concave curved surface 6 Projection 7 Chamfer 9 boundaries 10 concave curved surface 11 First inclined surface 12 Second inclined surface 13 Convex curved surface 32,38 inner ring 32a Axial end face 33 outer ring 34,35 balls, tapered rollers (rolling elements)

Claims (5)

[Claims] 1. A contact surface extending in the radial direction, which holds an inner ring, an outer ring, a rolling element provided between the inner ring and the outer ring, and one of the inner ring and the outer ring that contacts an axial end face of the one inner ring. A holding member having: and a tightening means for fixing the one inner and outer ring to the holding member, wherein the tightening means forms an axial end surface of the one inner and outer ring with a contact surface of the holding member. In the bearing device in which the rolling element is pre-loaded with the chamfered portion, the chamfered portion is formed on the axial end surface of the one inner and outer ring, leaving a protruding portion in contact with the abutting surface. A bearing device, wherein a boundary surface between the chamfered portion and the chamfered portion is an inclined surface which is inclined radially outward toward an axial end surface, and the inclination angle θ is 50 ° ≦ θ ≦ 80 °. 2. An inner ring, an outer ring, a rolling element provided between the inner ring and the outer ring, and a contact surface that holds one of the inner ring and the outer ring and extends in a radial direction with which an axial end surface of the one inner ring contacts. A holding member having: and a tightening means for fixing the one inner and outer ring to the holding member, wherein the tightening means forms an axial end surface of the one inner and outer ring with a contact surface of the holding member. In the bearing device in which the rolling element is preloaded with the chamfered portion, the chamfered portion is formed on the axial end surface of the one inner / outer ring, leaving a protruding portion in contact with the contact surface. A first inclined surface that is connected to the protruding portion and is inclined radially outward toward the axial end surface; and a first inclined surface that is connected to the first inclined surface via a convex curved surface and is radially outward toward the axial end surface. And a second slanted surface that is slanted at an angle of 10 ° ≦ θ ≦ 30 °. Bearing device characterized in that 3. An inner ring, an outer ring, a rolling element provided between the inner and outer rings, and a holding member holding one of the inner and outer rings,
A holding means for fixing the one inner and outer ring held by the holding member to the holding member, wherein the holding member has an axially extending holding surface for holding the one inner and outer ring, and the holding surface. A contact surface that is connected via a concave curved surface and extends in a radial direction with which the axial end surfaces of the one inner and outer rings come into contact, and the axial curved end surface of the one inner and outer ring faces the concave curved surface of the holding member. In the bearing device, wherein a convex curved surface is formed, the fastening means presses the axial end surfaces of the one inner and outer rings against the contact surface of the holding member to apply a preload to the rolling element, A chamfer is formed on the axial end surface of one of the inner and outer rings, leaving a protrusion that contacts the contact surface, and a boundary surface between the protrusion and the chamfer is directed radially outward toward the axial end surface. The inclined surface is inclined at an angle of 50 ° ≦ θ ≦ 80 °, and the concave curved surface is Radius R ₁ and radius R ₂ of the convex curved surface, R ₁ <
A bearing device characterized by being R ₂ . 4. An inner ring, an outer ring, a rolling element provided between the inner and outer rings, and a holding member holding one of the inner and outer rings,
A holding means for fixing the one inner and outer ring held by the holding member to the holding member, wherein the holding member has an axially extending holding surface for holding the one inner and outer ring, and the holding surface. A contact surface that is connected via a concave curved surface and extends in a radial direction with which the axial end surface of the one inner / outer ring contacts, and the fastening means holds the axial end surface of the one inner / outer ring. In a bearing device, which is pressed against a contact surface of a member to apply a preload to the rolling element, a chamfered portion is formed on an axial end surface of the one inner / outer ring, leaving a protruding portion in contact with the contact surface. The chamfered portion is connected to the protruding portion and is inclined radially outward toward the axial end surface, and the chamfered portion is connected to the first inclined surface via a convex curved surface and faces the axial end surface. And a second inclined surface inclined outward in the radial direction, the inclination angle θ of the first inclined surface is 10 ° ≦ θ ≦ 30 °, and the radius R ₁ of the concave curved surface and the radius R _{3 of the} convex curved surface are set to R ₁ <
A bearing device characterized by being R ₃ . 5. The bearing device according to claim 1, wherein the chamfered portion-side end portion of the boundary surface between the protruding portion and the chamfered portion has a concave curved surface.