JP3877867B2 - Vehicle wheel support structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle wheel support structure in which a wheel is supported at an end portion of an axle via a double-row tapered roller bearing, and more specifically, the sealability of the bearing is improved to improve mud water resistance. is there.
[0002]
[Prior art]
Bearings for supporting the wheels of vehicles have severe muddy water resistance requirements and high sealing performance is required. Referring to FIG. 4A, particularly in the case of a double-row tapered roller bearing, the muddy water intrusion path into the bearing includes a. A fitting surface between the outer diameter of the inner ring and the seal slinger; b. Two locations of the inner ring inner diameter portion are conceivable.
[0003]
Conventionally, as shown in an enlarged view in FIG. 4B, an X ring (5) is attached to the chamfered portion of the inner ring (12) so that muddy water does not enter between the spindle (1) and the inner ring (12). A sealed structure is known.
[0004]
[Problems to be solved by the invention]
However, in a severe usage situation where muddy water is constantly sprinkled, there is a concern that muddy water intrusion from the a part (the fitting surface between the inner ring outer diameter and the seal slinger) cannot be completely prevented in the case of the conventional structure of FIG. is there.
[0005]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to completely eliminate the above-mentioned conventional concerns and improve muddy water resistance in a vehicle wheel support structure using a double row tapered roller bearing.
[0006]
[Means for Solving the Problems]
According to the present invention , a sealing member is interposed between a sealing means for sealing the inside of a bearing mounted on a bearing inner ring that comes into contact with a shoulder portion of an axle and the shoulder portion so as to contact both the sealing means and the shoulder portion. Thus, the sealing performance of the a part and the b part is ensured at a time by one sealing member.
[0007]
That is, the vehicle wheel support structure according to claim 1 is mounted on a bearing inner ring that abuts against a shoulder portion of an axle in a vehicle wheel support structure in which a wheel is supported on an end portion of an axle via a double-row tapered roller bearing. a sealing member is interposed between the sealing means and the shoulder portion to seal the interior of the bearing, the seal member is mounted in the seal groove in the form of an annular stepped portion formed in the inner ring outer diameter, before Symbol sealing means And an O-ring elastically brought into contact with both of the shoulder portions.
[0009]
The vehicle wheel support structure according to claim 2 is mounted on a bearing inner ring that abuts against a shoulder portion of an axle in a vehicle wheel support structure in which a wheel is supported on an end portion of an axle via a double-row tapered roller bearing. a seal member is interposed between the sealing means and the shoulder portion to seal the interior of the bearing, the seal member includes a first annular lip for elastically contacting the sealing means, elastic contact with the shoulder It is characterized by being a seal ring with a second annular lip. In this case, a gap capable of mounting the seal ring is provided between the sealing means and the shoulder portion of the axle .
[0010]
As in the invention of claim 3, the sealing ring, composed of said first and second annular lip and a circular plate-shaped sealing body, said first and second annular lip on the outer periphery of the seal body The seal body may be integrally formed, and the seal body may be mounted in a seal groove in the form of an annular step formed on the inner ring outer diameter portion.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention illustrated in the drawings will be described.
[0012]
First, FIG. 1 shows the details of a double row tapered roller bearing (10). The double row tapered roller bearing (10) has two inner rings (12, 12) each having a raceway (12a, 12a) on its outer peripheral surface and fitted to the axle (1), and a double row raceway ( 14a, 14b), a double row tapered roller (14a, 14b) incorporated between a raceway (12a, 12a) of an inner ring (12, 12) and a raceway (14a, 14b) of an outer ring (14). 15), a cage (16) for holding the tapered rollers (15) in each row at a predetermined interval in the circumferential direction, and a seal (18) as a sealing means for sealing the bearing internal space. The structure of the portion indicated by the symbol S in FIG. 1 will be described later with reference to FIGS. 2 (B) and 3 (B).
[0013]
Next, FIG. 2 and FIG. 3 exemplify the mounting structure of the track driven wheel hub bearing, and the double row tapered roller bearing (10) is indicated generally by the reference numeral 10. The outer ring (14) has a flange (14), and the flange (14c) is fastened to the wheel plate (2) and the brake plate (3) by bolts (4). FIG. 2 shows an embodiment in which an O-ring (22) is employed as a seal member. The O-ring (22) includes a sealing slinger (19) constituting a part of a sealing means, that is, a seal (18) attached to the inner ring (12) on the side in contact with the shoulder (1a) of the spindle (1), It is interposed between the shoulder part (1a) of the spindle, and this O-ring (22) ensures the sealing performance of the a part and the b part (see FIG. 4). In this case, a seal groove (13) in the form of an annular step is formed in the outer diameter portion of the inner ring (12), and an O-ring (22) is attached to the seal groove (13). The arrangement is such that both the seal slinger (19) and the spindle shoulder (1a) are in elastic contact.
[0014]
FIG. 3 shows an embodiment in which a seal ring (24) is employed as a seal member. The seal ring (24) is formed of a rubber or other elastic material in a substantially cylindrical shape, and one end is a first annular lip (25) and the other end is a second annular lip (26). To do. The seal ring (24) is inserted between the seal slinger (19) and the spindle shoulder (1a), the first annular lip (25) is elastically abutted against the seal slinger (19), and the second By sealing the annular lip (26) against the spindle shoulder (1a), the sealing performance of the a part and the b part is ensured. The first and second annular lips (25, 26) are in an initial state before elastic deformation. Further, the seal ring (24) is formed integrally with the outer peripheral edge of the disc-shaped seal body (28) with the first and second annular lips (25, 26). The seal body (28) is formed integrally with the cored bar (27), and is mounted in a seal groove (13) in the form of an annular step having an inner peripheral edge formed at the inner ring outer diameter portion. As a result, the seal ring (24) is securely held at a predetermined position, and an appropriate contact state between the first and second annular lips (25, 26) is maintained. can do.
[0015]
As described above, according to the present invention, the sealing means and the shoulder are provided by interposing a sealing member between the sealing means for sealing the inside of the bearing mounted on the bearing inner ring that contacts the shoulder of the axle and the shoulder. By contacting both of the parts, the sealing performance of the part a (the fitting surface between the outer diameter of the inner ring and the sealing means) and the part b (the inner diameter of the inner ring) can be ensured at one time by one sealing member. Therefore, according to the present invention, the sealing effect of the double row tapered roller bearing is improved, and a vehicle wheel support structure with high mud water resistance is obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a double row tapered roller bearing.
2A is a partial longitudinal sectional view showing a wheel support structure, and FIG. 2B is an enlarged view of a seal member portion (corresponding to S portion in FIG. 1).
3A is a partial longitudinal sectional view showing a wheel support structure, and FIG. 3B is an enlarged view of a seal member portion (corresponding to S portion in FIG. 1).
4A is a partial longitudinal sectional view showing a conventional technique, and FIG. 4B is an enlarged view of an X seal portion.
[Explanation of symbols]
1 Axle (spindle)
DESCRIPTION OF SYMBOLS 1a Shoulder part 2 Wheel board 3 Brake board 4 Mounting bolt 10 Double row tapered roller bearing 12 Inner ring 12a Track 13 Seal groove 14 Outer ring 14a, 14b Track 15 Tapered roller 16 Cage 18 Seal (sealing means)
19 Seal slinger 22 O-ring 24 Seal ring 25 First annular lip 26 Second annular lip 27 Core metal 28 Seal body

Claims (3)

In a vehicle wheel support structure in which a wheel is supported at an end of an axle via a double-row tapered roller bearing, a sealing means for sealing the inside of the bearing mounted on a bearing inner ring that contacts the shoulder of the axle, and the shoulder a seal member is interposed between said seal member is mounted in the seal groove in the form of an annular stepped portion formed in the inner ring outer diameter, resiliently abutting the front Symbol sealing means on both of the shoulder portion A wheel support structure for a vehicle, wherein the wheel support structure is an O-ring . In a vehicle wheel support structure in which a wheel is supported on an end portion of an axle via a double-row tapered roller bearing, a sealing means for sealing the inside of the bearing mounted on a bearing inner ring that contacts the shoulder portion of the axle, and the shoulder portion A seal member is interposed therebetween, and the seal member includes a first annular lip that elastically contacts the sealing means and a second annular lip that elastically contacts the shoulder. A vehicle wheel support structure characterized by being a ring. Configure the previous SL sealing ring between the first and second annular lip and disk-shaped sealing body, integrally to form the first and second annular lip on the outer periphery of the seal body, of the sealing body The wheel support structure for a vehicle according to claim 2, wherein the peripheral edge is mounted in a seal groove in the form of an annular step formed on the outer diameter portion of the inner ring.

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