JP2003049853A - Seal structure of bearing device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem of a seal structure of a bearing device formed with a diametrically contact object surface perpendicular to the axial direction in a bowl-shaped outer ring member of a constant velocity joint and allowing a lip part to contact therewith, wherein the diameter of the bowl-shaped outer ring member is enlarged by a portion for securing the diametrically contact object surface perpendicular to the axial direction in the bowl-shaped outer ring member. SOLUTION: The outside diameter of a part formed with a diametrical surface 38 of the bowl-shaped outer ring member in the constant velocity joint 6 is formed as small as possible, the seal structure 12 is provided with a metal annulus 42 with a contact annulus part 41 in contact with the diametrical surface 38, and an axial lip part 16 is made to contact with the contact annulus part 41 of the metal annulus 42. This constitution can improve its sealing performance compared with the conventional seal structure wherein the sliding surface of the axial lip part 16 is secured and then the lip part is made to contact with a curved surface of the bowl-shaped outer ring member 7 without increasing the weight of the bowl-shaped outer ring member 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure for a vehicle bearing device.

[0002]

2. Description of the Related Art Conventionally, there is a vehicle bearing device 1 as shown in FIG. This is a cylindrical outer ring member 10 mounted non-rotatably on the vehicle body side, and a plurality of rows of balls 8 on the cylindrical outer ring member 10.
It has a hub wheel 4 and a bowl-shaped outer ring member 7 of a constant velocity joint 6 which are rotatably supported about an axis 21 via a shaft 9. Bowl-shaped outer ring member 7 of this constant velocity joint 6
The hub portion of the hub wheel 4
The bowl-shaped outer ring member 7 is integrated with the hub wheel 4 by spline-fitting in the center hole 5 of the shaft and caulking the end of the shaft portion.

The annular bearing spaces between the cylindrical outer ring member 10 and the hub wheel 4 and the bowl-shaped outer ring member 7 of the constant velocity joint 6 are sealed by seal structures 11 and 12, respectively. Of these seal structures 11 and 12, the seal structure 12 provided between the tubular outer ring member 10 and the bowl-shaped outer ring member 7 of the constant velocity joint 6 is shown in FIG. This is an annular core metal 14 fitted to the tubular outer ring member 10,
A plurality of elastic lip portions 16 fixed to the core metal 14 are provided, and these lip portions 16 contact the outer peripheral sloped surface 17 (curved surface) of the bowl-shaped outer ring member 7 of the constant velocity joint 6. There is.

In this seal structure 12, the lip portion 1
Since 6 is in contact with the slope of the bowl-shaped outer ring member 7, the lip portion 1 is a stack of component tolerances, especially for radial deviations.
The variation in the interference of No. 6 becomes large and the sealing property deteriorates.

Therefore, as shown in FIG. 9, a contact surface 18 is formed on the bowl-shaped outer ring member 7 in the radial direction at right angles to the direction of the axis 21.
It is conceivable that the lip portion 16 contacts the contacted surface 18 in the axial direction.

[0006]

Generally, the seal structure 12 is used.
Then, in order to secure a predetermined sealing property, the contacted surface 18
It is necessary to have a lip portion 16 that contacts in the axial direction. In order to further improve the sealing property, it is necessary to provide the lip portions 16 that make contact with each other in the axial direction in multiple rows.

However, as shown in FIG. 9, the bowl-shaped outer ring member 7 is provided with a contact surface 18 in the radial direction perpendicular to the direction of the axis 21 and the contact surface 18 is provided with a double row of axial directions. When the lip portion 16 of the bowl-shaped outer ring is brought into contact with the bowl-shaped outer ring member 7, it is necessary to secure a sufficient length of the contacted surface 18 in the radial direction perpendicular to the direction of the axis 21 in the bowl-shaped outer ring member 7. The diameter of the member 7 must be increased. Therefore, there is a problem that the weight of the bowl-shaped outer ring member 7 increases.

Therefore, an object of the present invention is to provide a seal structure for a bearing device for a vehicle, which can solve the above problems.

[0009]

In order to solve the above problems, a seal structure for a bearing device for a vehicle according to the present invention is a cylindrical outer ring that is non-rotatably mounted on a vehicle body and has a double row raceway on an inner peripheral surface. A member, a hub wheel having a track corresponding to one track of the tubular outer ring member on the outer peripheral surface for mounting the wheel, and a hub wheel that is rotatably attached to the hub wheel and the other of the tubular outer ring member. A bowl-shaped outer ring member of a constant velocity joint having a track corresponding to the track on its outer peripheral surface, and a compound outer ring member disposed between each of the corresponding tracks of the cylindrical outer ring member and the hub wheel and the cylindrical outer ring member and the bowl-shaped outer ring member. In a vehicle bearing device including a row of rolling elements, a cored bar fitted to the inner peripheral end surface on the other side of the tubular outer ring member, an elastic seal body attached to the cored bar, and the bowl-shaped outer ring member. Fitted near the other raceway surface in And a ring body with which the elastic seal body comes into contact, the ring body having a diameter smaller than that of the tubular outer ring member, and at an axially inner position with respect to the tubular outer ring member. A projecting portion of the ring body is provided on the elastic seal body, the projecting portion projecting radially outward from a small diameter portion formed on the outer peripheral portion of the bowl-shaped outer ring member and having a smaller diameter than the outer diameter of the tubular outer ring member. Is formed with a lip portion that contacts from the axial direction.

Further, the small diameter portion is a shoulder portion connected to the other raceway surface of the bowl-shaped outer ring member, and the ring body has a cylindrical portion press-fitted into the small diameter portion.

As in the above-mentioned structure, the annular body with which the elastic seal body comes into contact is formed to have a smaller diameter than the tubular outer ring member, and the annular body is shaped like a bowl at an axially inner position with respect to the tubular outer ring member. A projecting portion that is formed on the outer peripheral portion of the outer ring member and projects outward in the radial direction from a small diameter portion that is smaller than the outer diameter of the tubular outer ring member is provided. By forming the lip portion in contact with the bowl-shaped outer ring member, for example, even if the lip portion has a plurality of rows in the radial direction, the sliding surface is secured and high sealing performance is obtained without increasing the weight of the bowl-shaped outer ring member. .

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A seal structure for a vehicle bearing device according to an embodiment of the present invention will be described below with reference to FIGS.

First, a vehicle bearing device 1 according to a first embodiment of the present invention will be described with reference to FIG.
A single cylindrical outer ring member 10 that is non-rotatably attached to the vehicle body side via a knuckle is provided, and the cylindrical outer ring member 10 has an inner peripheral surface thereof as an outer ring raceway surface and is equidistantly circumferentially arranged on a cage 20. A hub wheel 4 for mounting wheels via a double row of balls (an example of rolling elements) 8 and 9 held by the wheel, and a bowl shape of a constant velocity joint 6 described later, which is integrally mounted on the hub wheel 4. The outer ring member 7 is supported rotatably around the axis 21.

The outer peripheral surface of the hub wheel 4 is used as the inner ring raceway surface of the balls 8 in one row corresponding to one of the outer raceway surfaces, and the outer row of balls 9 in the other row corresponding to the other of the outer raceway surfaces is used. The outer peripheral surface of the bowl-shaped outer ring member 7 is used as the inner ring raceway surface. A mounting flange 22 is formed on the outer peripheral surface of the tubular outer ring member 10 so as to project radially outward, and the mounting flange 22 is fixed to the knuckle.

A cylindrical outer ring member 10 of the hub wheel 4.
A hub flange 2 that projects radially outward is formed on the outer circumferential surface of the portion that projects from the vehicle outer side A to the brake flange. Hub bolts 23 for fixing the wheel member are press-fitted into the.

The bowl-shaped outer ring member 7 has a vehicle outer side A.
, A hollow shaft portion 25 that is spline-fitted is integrally formed in an insertion hole 24 formed in the center of the hub wheel 4, and the vehicle outer side A end portion of the shaft portion 25 is caulked, whereby The shaft portion 25 and the hub wheel 4 have a shaft center 21.
It is configured so that it can rotate around the body.

The constant velocity joint 6 uses what is called a Rzeppa type (Burfield type), and the bowl-shaped outer ring member 7 and the inner ring portion 27 in which the end of the drive shaft 26 is inserted and fixed. , A ball 28 for tilting and guiding the hub wheel 4 with respect to the drive shaft 26, and a retainer 29 thereof.

Next, the seal structures 11 and 12 in the vehicle bearing device 1 will be described. First, one (vehicle outer side A) sealing structure 11 for sealing the gap between the cylindrical outer ring member 10 and the hub wheel 4 will be described.

As shown in FIG. 2, this is the outer peripheral surface 30 for sealing which is parallel to the direction of the axis 21 on the hub flange 2 side of the hub wheel 4 and the axis 21 on the base end side of the hub flange 2.
A radial side surface 31 for sealing, which is perpendicular to the direction, and a core metal 13 fitted to the inner peripheral surface of the tubular outer ring member 10 on the vehicle outer side A.
And the outer peripheral surface 30 for sealing fixed to the core metal 13.
And a resilient seal body 37 having a bifurcated radial lip portion 35 and an axial lip portion 15 contacting the sealing side surface 31.

Next, the other (vehicle inner side B) sealing structure 12 for sealing the gap between the cylindrical outer ring member 10 and the bowl-shaped outer ring member 7 of the constant velocity joint 6 will be described. This is a cylindrical outer ring member 10 of the bowl-shaped outer ring member 7.
A radial surface 38 formed in the radial direction perpendicular to the axial center 21 direction at the end portion on the side close to the side, and a fitting parallel to the axial center 21 direction on the ball 9 side of the other row of the radial surface 38. The surface 39, the fitting portion 40 fitted to the fitting surface 39, and the radial surface 38.
A ring 42 made up of a contact ring portion 41 that abuts (overlaps)
(A ring), a cored bar 14 fitted to the inner peripheral surface of the cylindrical outer ringed member 10 on the bowl-shaped outer ringed member 7 side, and fixed to the cored bar 14 to come into contact with the fitting part 40. Radial lip part 3
6 and the elastic seal body 43 (two rows in the radial direction in the figure) having the axial lip portions 16 of different diameters that come into contact with the contact ring portion 41.

The core metal 14 is provided with a fixing portion 44 for mounting the elastic seal body 43 and a radial direction outwardly bent from the fixing portion 44 along the end face of the cylindrical outer ring member 10 in the radial direction. The outer end portion is formed of a projecting portion 45 extending to the vehicle inner side B in parallel with the axis 21 direction.

The contact ring portion 41 of the metal ring 42 has an extension portion 46 extending radially outward from the radial surface 38, and the protrusion portion 45 of the core metal 14 and the extension portion 46 of the metal ring 42.
A labyrinth gap 47 is formed between and.

The extension portion 46 projects outward in the radial direction from a small diameter portion 50 formed on the vehicle inner side B of the radial surface 38 of the bowl-shaped outer ring member 7 to have a diameter as small as possible. That is, the diameter of the extension portion 46 is set smaller than the outer diameter of the tubular outer ring member 10 and larger than the diameter of the small diameter portion 50. The larger diameter axial lip portion 16 of the two rows of axial lip portions 16 is in contact with the extension portion 46.

As described above, in the first embodiment of the present invention,
As the other seal structure, a fitting surface 39 parallel to the axial center 21 direction is formed on the outer peripheral surface of the bowl-shaped outer race member 7 that radially faces the vehicle inner side A end of the cylindrical outer race member 10, and the axial center is formed. A radial surface 38 that is perpendicular to the direction 21 is formed, and a metal ring 42 having a contact ring portion 41 that abuts on the radial surface 38 is fitted in such a recess, and the diameter of the contact ring portion 41 of the metal ring 42 is different. The axial lips 16 are contacted in double rows.

With this structure, the component tolerance of the axial lip 16 can be eliminated, and the sealability can be improved as compared with the conventional seal structure in which the lip portion is in contact with the curved surface of the bowl-shaped outer ring member 7. In addition, since the axial lips 16 are provided in double rows, a high sealing property can be obtained.

In addition, by forming a small diameter portion 50 on the vehicle inner side A of the radial surface 38 of the bowl-shaped outer ring member 7, the axial lip 16 is brought into contact with the contact ring portion 4 of the metal ring 42.
It is possible to secure the sliding surfaces of the double rows of axial lips 16 in a state in which the sealability is improved by making contact with 1 and without increasing the weight of the bowl-shaped outer ring member 7.

Next, a second embodiment of the present invention will be described with reference to FIG. The other sealing structure 12 in the second embodiment of the present invention is a radial direction that is raised in a radial direction perpendicular to the axis 21 at the end portion of the bowl-shaped outer ring member 7 close to the tubular outer ring member 10. A surface 38 is formed and this radial surface 3
On the ball 9 side of the other row of 8, the axial center 21 is located at a position facing the inner peripheral surface of the end of the tubular outer ring member 10 on the vehicle inner side A in the radial direction.
The fitting surface 39 formed in parallel with the direction, a fitting part 40 fitted to the fitting surface 39, and a metal ring 42 including a contact ring part 41 adjacent to the radial surface 38, and the tubular outer ring member 1
No. 0 core metal 14 having a substantially L-shaped cross section fitted on the inner peripheral surface of the vehicle inner side A end, and a forked radial lip portion 36 fixed to the core metal 14 and contacting the fitting portion 40, and Single axial lip part 1 which contacts the contact ring part 41
6 and an elastic seal body 43 having

Further, the bowl-shaped outer ring member 7 has a radial surface 38.
The outer peripheral portion of the vehicle inner side A, which has been formed to have a small diameter, is formed as small as possible to form a small diameter portion 50.
Protrudes outward in the radial direction from the small diameter portion 50, and the contact ring portion 41 is formed to have a diameter smaller than that of the tubular outer ring member 10.

The other structure of the vehicle bearing device 1 is the same as that of the above-described first embodiment, and the structure of the one seal structure 11 is the same as that of the above-mentioned first embodiment, and therefore the description thereof is omitted. .

As described above, according to the second embodiment of the present invention, the outer diameter of the portion of the bowl-shaped outer ring member 7 on the vehicle inner side A where the radial surface 38 is formed is formed as small as possible.
On the other seal structure 12, a contact ring portion 41 parallel to the radial surface 38 formed at the end of the bowl-shaped outer ring member 7 on the side close to the cylindrical outer ring member 10 and a fitting surface parallel to the axial center 21 direction. Three
A gold ring 42 having a fitting portion 40 to be fitted to the inner ring 9 is provided, the axial lip portion 16 is brought into contact with the contact ring portion 41 of the gold ring 42, and the radial lip portion 36 is brought into contact with the fitting portion 40.

As a result, the sealing performance is improved as compared with the seal structure 12 in which the lip portion is in contact with the curved surface of the bowl-shaped outer ring member 7 without increasing the weight of the bowl-shaped outer ring member 7. You can

Next, a third embodiment of the present invention will be described with reference to FIG. In the above-described first embodiment, the other seal structure 12 includes the radial surface 38 formed in the radial direction perpendicular to the axial center 21 direction and the axial center 21 on the ball 9 side of the other row of the radial surface 38. A fitting surface 39 parallel to the direction, a fitting part 40 (cylindrical part) fitted to the fitting surface 39, and a metal ring 42 including a contact ring part 41 abutting the radial surface 38, and the tubular outer ring member 10. Core 14 fitted to the inner peripheral surface of the bowl-shaped outer ring member 7 side
And the elastic seal body 43 having two rows of the axial lip portions 16 that are in contact with the fitting portion 40 and that are in contact with the contact ring portion 41.

On the other hand, in the other seal structure 12 according to the third embodiment of the present invention, the outer peripheral surface 30 for sealing which is parallel to the axial center 21 direction is formed on the vehicle outer side A of the radial surface 38, and the bowl is formed. On the vehicle inner side B of the radial surface 38 of the shaped outer ring member 7, the bowl-shaped outer ring member 7 is formed to have the smallest possible diameter and the small diameter portion 50 is provided, so that the fitting surface 39 parallel to the axis 21 direction. And the contact ring portion 41 of the metal ring 42 forms the radial surface 38.
The fitting portion 40 so that the fitting portion 40 is arranged on the same plane as the fitting surface 39.
Is attached to.

The two axial lip portions 16,
One of 16b is brought into contact with the contact ring portion 41, the other is brought into contact with the radial surface 38, and the radial lip portion 36
An elastic seal body 43 is provided, which is in contact with the outer peripheral surface 30 for sealing. The outer diameter of the contact ring portion 41 is smaller than the outer diameter of the tubular outer ring member 40.

Since the shape of the cored bar 14 is the same as that of the first embodiment, the description thereof will be omitted. A labyrinth gap 47 is formed between the protrusion 45 of the core metal 14 and the metal ring 42.

In the above structure, the outer diameter of the portion of the bowl-shaped outer ring member 7 on the vehicle inner side A of the portion on which the radial surface 38 is formed is formed as small as possible, and in the other seal structure 12, the axial lip portion is formed. One of 16a and 16b is the contact ring portion 4
The radial lip portion 36 is brought into contact with the radial outer surface 30 and the radial lip portion 36 is brought into contact with the radial surface 38, while the other is brought into contact with the radial surface 38, so that the weight of the bowl-shaped outer ring member 7 is not increased. The sealing property can be improved as compared with the seal structure in which the sliding surface of 16b is secured and the lip portion is configured to contact the curved surface of the bowl-shaped outer ring member 7.

Further, by forming a labyrinth gap 47 between the projecting portion 45 of the core metal 14 and the metal ring 42, the axial lip portions 16a, 16b are simply connected to the radial contact ring portion 4.
The sealability can be further improved as compared with the case of contacting with 1 in the direction along the axis 21.

Next, a fourth embodiment of the present invention will be described with reference to FIG. The other seal structure 12 in the fourth embodiment of the present invention is a bowl-shaped outer ring member 7, wherein an outer peripheral surface portion facing the end of the tubular outer ring member 10 is a curved outer peripheral surface 30 for sealing. The vehicle inner side A of the sealing outer peripheral surface 30 is formed to have a diameter as small as possible to form a small diameter portion 50, thereby forming a fitting surface 39 parallel to the shaft center 21.

The outer peripheral surface 30 for sealing and the fitting surface 39
The fitting portion 40 (cylindrical portion) of the metal ring 42 having the contact ring portion 41 protruding outward in the radial direction from the shoulder portion continuous with is fitted to the fitting surface 39, and the outside of the contact ring portion 41. The diameter is smaller than the diameter of the tubular outer ring member 10.

Bowl-shaped outer ring member 7 of the cylindrical outer ring member 10
Side core 14 fitted to the inner peripheral surface of the end, and the core 14
And an elastic seal body 43 having an axial lip portion 16 fixed to the contact ring portion 41 and a lip portion 48 contacting the outer peripheral surface 30 for sealing. The configuration of the core metal 14 is the same as that of the first embodiment,
A labyrinth gap 47 is formed between the protruding portion 45 of the core metal 14 and the contact ring portion 41 of the metal ring 42. The other structure is similar to that of the first embodiment described above, and will be omitted.

In the above structure, the fitting surface 39 is formed to have a diameter as small as possible, and the axial lip portion 16 comes into contact with the contact ring portion 41 of the metal ring 42 along the radial direction, so that the bowl-shaped outer ring member 7 is formed. The sealing performance is improved as compared with the seal structure 12 in which the sliding surface of the axial lip portion 16 is ensured without increasing the weight and the lip portion contacts the curved surface of the bowl-shaped outer ring member 7. be able to. Further, since the labyrinth gap 47 is formed between the projecting portion 45 of the cored bar 14 and the contact ring portion 41 of the metal ring 42, the axial lip portion 16 is simply attached to the radial contact ring portion 41 and the shaft center 21. The sealability can be further improved as compared with the case of contacting in the direction along the direction.

FIG. 6 shows still another embodiment. The other seal structure in this embodiment does not use the gold ring 42. That is, it has the core metal 14 and the elastic seal body 43 of the same configuration as the first embodiment, and the plurality of axial lip portions 16 thereof are brought into contact with the radial surface 38, and the radial lip portion 36 is connected to the radial surface. The outer peripheral surface 38 of the vehicle 38 is formed in contact with a sealing outer peripheral surface 30 parallel to the axis 21 direction. Also, the radial surface 3
On the outer peripheral surface of the vehicle inner side B of 8, a small diameter portion 50 having a diameter as small as possible is provided, and a labyrinth gap 47 is provided between the protruding portion 45 of the core metal 14 and the radial surface 38. The outer diameter of the radial surface 38 is smaller than the diameter of the tubular outer ring member 10.

Also in this case, the sliding surface of the axial lip portion 16 can be secured and the sealing performance can be improved without increasing the weight of the bowl-shaped outer ring member 7.
When the labyrinth gap 47 is formed between the protruding portion 45 and the radial surface 38, the axial lip portion 16 is simply brought into contact with the radial contact ring portion 41 in the direction along the axis 21. Compared with, the sealing property can be further improved.

[0044]

As is apparent from the above description, the present invention provides a bowl-shaped outer ring member as a sealing structure for sealing a gap between a tubular outer ring member and a bowl-shaped outer ring member of a constant velocity joint. Since the lip portion that comes into contact with the radial surface in the direction perpendicular to the axial direction is provided, this lip portion comes into contact with the radial surface in the axial direction. Compared to the case where the joint is in contact with the slope of the bowl-shaped outer ring member, the sealability can be improved, and the bowl-shaped outer ring member is provided with another member having a radial surface perpendicular to the axial direction. Therefore, it is not necessary to increase the diameter of the bowl-shaped outer ring member itself, and therefore, even if the bowl-shaped outer ring member has a plurality of lip portions, the sliding surface can be secured, and the sealing performance is improved. It is possible to suppress an increase in the weight of the.

[Brief description of drawings]

FIG. 1 is an overall cross-sectional view showing a vehicle bearing device and a seal structure thereof according to a first embodiment of the present invention.

FIG. 2 is a detailed cross-sectional view showing the seal structure of the same.

FIG. 3 is a detailed sectional view of a seal structure showing a second embodiment of the present invention.

FIG. 4 is a detailed sectional view of a seal structure showing a third embodiment of the present invention.

FIG. 5 is a detailed sectional view of a seal structure showing a fourth embodiment of the present invention.

FIG. 6 is a detailed sectional view of a seal structure showing a fifth embodiment of the present invention.

FIG. 7 is an overall cross-sectional view showing a conventional vehicle bearing device and its seal structure.

FIG. 8 is a detailed cross-sectional view of the seal structure.

FIG. 9 is a detailed cross-sectional view showing another conventional seal structure.

[Explanation of symbols]

1 Vehicle bearing device 4 hub wheels 6 constant velocity joint 7 Bowl-shaped outer ring member 10 Cylindrical outer ring member 12 Seal structure 14 core metal 16 Axial lip part 36 Radial lip part 38 Radial surface 39 Fitting surface 40 Fitting part 41 Contact ring 42 gold ring 43 Elastic seal body 44 Fixed part 45 Projection 46 Extension 47 Gap for labyrinth 50 small diameter part

Claims (3)

[Claims] 1. A wheel having a cylindrical outer ring member non-rotatably mounted on a vehicle body and having double-row tracks on the inner peripheral surface, and a track corresponding to one track of the cylindrical outer ring member on the outer peripheral surface. A hub wheel for attaching a hub wheel, a bowl-shaped outer ring member of a constant velocity joint which is attached to the hub wheel so as to rotate integrally and has a track corresponding to the other track of the cylindrical outer ring member on the outer peripheral surface, A seal structure for a vehicle bearing device, comprising: an outer ring member and a hub wheel; and a double row rolling element arranged between respective corresponding races of a cylindrical outer ring member and a bowl-shaped outer ring member, the tubular outer ring member A cored bar fitted to the inner peripheral end surface of the other side, an elastic seal body attached to the cored bar, and a ring fitted in the vicinity of the other raceway surface of the bowl-shaped outer ring member and to which the elastic seal body contacts. And a ring body, A small diameter smaller than the outer diameter of the tubular outer ring member and formed on the outer peripheral portion of the bowl-shaped outer ring member at an axially inward position with respect to the tubular outer ring member. A protrusion that protrudes outward in the radial direction from the portion, and a lip that contacts the protrusion of the ring body from the axial direction is formed on the elastic seal body. Seal structure. 2. The seal structure for a bearing device for a vehicle according to claim 1, wherein the small diameter portion is a shoulder portion connected to the other raceway surface of the bowl-shaped outer ring member. 3. The seal structure for a vehicle bearing device according to claim 1, wherein the annular body has a cylindrical portion that is press-fitted into the small diameter portion.