JPH0858301A - Hub cap structure of wheel - Google Patents

Abstract

PURPOSE: To securely maintain the sealing property through a rubber packing in the press fitting condition of a hub cap by stabilizing the press fitting direction of the hub cap, in a hub cap construction in which the hub cap having rubber packing is press-fitted in the cap fitting hole of a wheel housing. CONSTITUTION: A cap fitting hole is formed into a cap fitting taper hole 2 of which the hole inner diameter is gradually contracted from the outside of a vehicle toward the inside in the inner shape, and an annular rubber packing 5 is formed to be a rubber packing 5 having a taper face 5a of which the outer diameter of the packing is gradually spread from the inside of press fitting toward the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hub cap structure for a wheel which is press-fitted into a wheel housing in order to prevent dust and muddy water from entering from the outside and prevent leakage of grease filled inside.

[0002]

2. Description of the Related Art Conventionally, as a hub cap structure for a wheel, for example, one shown in FIG. 5 is known.

In the conventional structure, a hub cap having an annular rubber packing adhered to its outer periphery is press-fitted into a cap fitting hole formed at the axial center of the wheel housing.

[0004]

However, in the hub cap structure for a conventional wheel described above, neither the inner diameter of the cap fitting hole nor the outer diameter of the packing of the rubber packing is parallel to the press-fitting direction. Since the outer diameter of the packing is set to be slightly larger than the inner diameter of the hole and the difference in diameter is used as the press-fitting margin, a large press-fitting resistance that collapses and deforms the press-fitting margin from the initial press-fitting is added, reducing the press-fitting resistance during press-fitting. As described above, the hub cap is press-fitted in an inclined state, and the press-fitting direction of the hub cap is not stable.

As a result, as shown in FIG. 6, when the hub cap is press-fitted obliquely, the area of the contact portion between the rubber packing and the cap fitting hole becomes small, and it becomes difficult to secure the sealing performance.

The present invention has been made in view of the above problems. A first object of the present invention is to provide a hub cap for a wheel in which a hub cap having a rubber packing is press-fitted into a cap fitting hole of the wheel housing. In structure,
It is to stabilize the press-fitting direction of the hub cap and to reliably maintain the sealability by the rubber packing when the hub cap is press-fitted.

In addition to the first purpose, the second purpose is to reduce the press-fitting work force and to prevent the hub cap from coming off easily when a force acts in the direction to come off.

[0008]

In order to achieve the above first object, the hub cap structure for a wheel according to the first aspect of the present invention comprises:
In a hub cap structure for a wheel, in which a hub cap having an annular rubber packing adhered to the outer periphery thereof is press-fitted into a cap fitting hole formed at an axial center position of the wheel housing, the cap fitting hole has an inner surface shape Is a cap fitting tapered hole in which the hole inner diameter is gradually reduced from the vehicle outer side to the inner side, and the annular rubber packing is
It is characterized in that the rubber packing has a tapered surface in which the outer diameter of the packing gradually increases from the inner side of the press-fitting to the outer side.

In order to achieve the second object, in the hub cap structure for a wheel according to the second invention, in the hub cap structure for a wheel according to claim 1, the taper surface of the rubber packing is perpendicular to the taper surface. A plurality of slit annular grooves inclined in the press-fitting direction are provided along the tapered surface.

[0010]

The operation of the first invention will be described.

When a hub cap having an annular rubber packing adhered to the outer periphery thereof is press-fitted into a cap fitting hole formed at the axial center of the wheel housing, the cap fitting hole has an inner surface shape from the outside of the vehicle to the inside. And a ring-shaped rubber packing having a tapered surface in which the outer diameter of the packing gradually increases from the inner side of the press-fit to the outer side. By doing so, there is almost no press-fitting resistance in the initial stage of press-fitting with no overlap margin, and press-fitting progresses gradually as the overlap margin increases, and the press-fitting resistance becomes maximum at the final press-fitting position. .

Therefore, during the press-fitting work, the rubber packing is press-fitted uniformly over the entire circumference of the rubber packing while gradually increasing the press-fitting resistance, and the press-fitting direction of the hub cap is stabilized. In addition, due to the stabilizing action of the hub cap in the press-fitting direction, a large area of the contact portion between the rubber packing and the cap fitting hole is secured in the completely press-fitted state of the hub cap, so that reliable sealing performance is maintained.

The operation of the second invention will be described.

When the hub cap is press-fitted, a plurality of slit annular grooves that are inclined in the press-fitting direction with respect to the direction perpendicular to the taper surface are provided on the tapered surface of the rubber packing. As a result, the bending reaction force of the erected portion enables sealing, and compared with the case of crushing and deforming this portion with a press-fitting margin, the press-fitting resistance is greatly reduced, and the work force of press-fitting is reduced.

In addition, when a force acts in the direction in which the hub cap is disengaged while the hub cap is press-fitted, a slit annular groove that is inclined in the press-fitting direction with respect to the taper surface vertical direction stands upright in the taper surface and is adjacent to it. Due to the slit annular groove, the bending reaction force of the standing portion increases, and the hub cap becomes difficult to come off.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

First, the structure will be described.

FIG. 1 is a sectional view showing a hub cap structure of a wheel of an embodiment corresponding to the first invention and the second invention.

In FIG. 1, 1 is a wheel housing,
2 is a cap fitting tapered hole, 3 is a wheel bearing hole, 4 is a hub cap, 5 is a rubber packing, and 6 is a packing support ring.

A wheel bearing hole 3 is formed in the wheel housing 1 at its axial center position, and a shaft member such as a knuckle spindle (not shown) is supported by the wheel bearing. A cap fitting taper hole 2 is formed on the outer side of the wheel bearing hole 3. The cap fitting taper hole 2 has an inner surface shape in which the hole inner diameter gradually decreases from the vehicle outer side to the inner side. ing.

An annular rubber packing 5 is adhered to a packing support ring 6 on the outer periphery of the hub cap 3, and the hub cap 3 is press-fitted into the cap fitting taper hole 2 and a dust from the outside, which is the purpose of the press-fitting seal. It prevents the ingress of oil and muddy water and the leakage of the enclosed grease.

The rubber packing 5 has a taper surface 5a whose packing outer diameter gradually increases from the inner side of the press-fitting to the outer side. The taper surface 5a has a direction perpendicular to the taper surface vertical direction. On the other hand, four slit annular grooves 5b inclined in the press-fitting direction are provided along the tapered surface 5a.

Next, the operation will be described.

[Stabilizing action in the press-fitting direction] When the hub cap 4 having the annular rubber packing 5 adhered to the outer periphery is press-fitted into the cap fitting hole formed at the axial center position of the wheel housing 1, the cap fitting hole is formed. The inner surface shape is a cap fitting taper hole 2 in which the inner diameter of the hole is gradually reduced from the outer side to the inner side of the vehicle, and an annular rubber packing 5 is formed.
Is a rubber packing 5 having a tapered surface 5a whose packing outer diameter gradually increases from the inner side of the press-fitting to the outer side, so as shown in FIG. There is almost no press-fitting resistance, press-fitting progresses, the press-fitting resistance gradually increases as the overlap margin increases, and as shown in FIG. 3, the press-fitting resistance becomes maximum at the press-fitting final position.

Therefore, at the time of press-fitting work, the rubber packing 5
The press-fitting is performed uniformly over the entire circumference of the hub cap while gradually increasing the press-fitting resistance, and the press-fitting direction of the hub cap 4 is stabilized.

Due to the stabilizing action of the hub cap 4 in the press-fitting direction, when the hub cap 4 is completely press-fitted, as shown in FIG.
By ensuring a large area of the contact portion with the, reliable sealing performance is maintained.

[Pressure-fitting work force reducing action] Hub cap 4
When the press-fitting is performed, the slit annular groove 5 that is inclined in the press-fitting direction with respect to the taper surface vertical direction is formed on the taper surface 5a of the rubber packing 5.
Since four b are provided along the tapered surface 5a, it becomes possible to perform sealing by the bending reaction force of the portion standing by the adjacent slit annular grooves 5b, 5b (see FIG. 3). In addition, as compared with the case where this portion is crushed and deformed with a press-fitting margin, the press-fitting resistance is greatly reduced, and the work force for press-fitting is reduced.

[Hub Cap Disengagement Prevention Function] In the hub cap press-fitted state, as shown in FIG. 3, the slit annular groove 5b is inclined in the press-fitting direction with respect to the direction perpendicular to the tapered surface. In this state, when a force acts in the direction in which the hub cap 4 comes off, as shown in FIG. 4, the inclination is gradually reduced by the force exerted by the slit annular groove 5b inclined in the press-fitting direction, and the tapered surface 5a is formed. Will stand vertically.

Therefore, the hub cap has the largest amount of bending deformation so that the portion of the slit annular groove 5b erected by the adjacent slit annular grooves 5b, 5b in a state where the slit annular groove 5b stands vertically to the taper surface 5a is the largest. When a force acts in the direction in which 4 is disengaged, the bending reaction force increases, and this becomes a resistance force in the disengagement direction, making it difficult for the hub cap 4 to disengage.

Next, the effect will be described.

(1) In the hub cap structure of a wheel in which the hub cap 4 having the rubber packing 5 is press-fitted into the cap fitting hole of the wheel housing 1, the cap fitting hole is formed so that its inner surface shape is from the outside to the inside of the vehicle. The taper surface 5 is a cap fitting taper hole 2 in which the inner diameter of the hole is gradually reduced, and an annular rubber packing 5 is formed so that the outer diameter of the packing is gradually increased from the inner side of the press-fitted portion to the outer side.
Since the rubber packing 5 has a, the hub cap 4
It is possible to stabilize the press-fitting direction of and to reliably maintain the sealability by the rubber packing 5 in the press-fitting state of the hub cap 4.

(2) On the taper surface 5a of the rubber packing 5,
Since four slit annular grooves 5b that are inclined in the press-fitting direction with respect to the vertical direction of the taper surface are provided along the taper surface 5a, the press-fitting work force can be reduced and a force acts in the direction in which the hub cap 4 comes off. Sometimes it can be hard to come off.

Although the embodiments have been described above with reference to the drawings, the specific structure is not limited to the embodiments, and modifications and additions within the scope of the present invention are included in the present invention. Be done.

For example, the number of slit annular grooves formed in the rubber packing is not limited to the embodiment.

[0035]

According to the first invention of claim 1,
In a wheel hub cap structure in which a hub cap having a rubber packing is press-fitted into the cap fitting hole of the wheel housing, the inner diameter of the cap fitting hole is gradually reduced from the outer side to the inner side of the vehicle. Since it is a cap fitting tapered hole and the annular rubber packing is a rubber packing having a taper surface where the packing outer diameter gradually increases from the inner side of the press fit to the outer side,
It is possible to obtain an effect that the press-fitting direction of the hub cap can be stabilized and the rubber packing can surely maintain the sealing property in the press-fitted state of the hub cap.

According to a second aspect of the present invention, in the hub cap structure for a wheel according to the first aspect, a slit annular groove which is inclined in a press-fitting direction with respect to a taper surface of the rubber packing is perpendicular to the taper surface. In addition to the above effects, the press-fitting work force can be reduced and the hub cap can be prevented from coming off when a force acts in the direction of coming off.

[Brief description of drawings]

FIG. 1 is a sectional view showing a hub cap structure of a wheel of an embodiment.

FIG. 2 is a diagram showing a hub cap press-fitting initial state in the wheel hub cap structure of the embodiment.

FIG. 3 is a diagram showing a hub cap press-fitting completed state in the wheel hub cap structure of the embodiment.

FIG. 4 is a diagram showing a deformed state of the rubber packing when a force is applied in a hub cap press-fitting state in a hub cap structure of a wheel of the embodiment in a direction to remove the hub cap.

FIG. 5 is a sectional view showing a hub cap structure of a conventional wheel.

FIG. 6 is a view showing a state in which a hub cap in a conventional wheel hub cap structure is inclined and press-fitted.

[Explanation of symbols]

 1 Wheel housing 2 Cap fitting taper hole 3 Wheel bearing hole 4 Hub cap 5 Rubber packing 5a Tapered surface 5b Slit annular groove 6 Packing support ring

Claims (2)

[Claims] 1. A hub cap structure for a wheel, wherein a hub cap having an annular rubber packing adhered to its outer periphery is press-fitted into a cap fitting hole formed at an axial center position of the wheel housing. Is a cap-fitting tapered hole whose inner surface shape is gradually reduced from the vehicle outer side to the inner side, and the annular rubber packing is press-fitted so that the packing outer diameter gradually increases from the inner side to the outer side. A hub cap structure for a wheel, which is a rubber packing having an enlarged tapered surface. 2. The hub cap structure for a wheel according to claim 1, wherein a plurality of slit annular grooves inclined in the press-fitting direction with respect to a direction perpendicular to the tapered surface are provided on the tapered surface of the rubber packing along the tapered surface. Hub cap structure for wheels.