JP2003127609A - Vehicular wheel mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mount accurately a vehicular wheel and an axle without impair ment of mounting workability. SOLUTION: Center deviation preventive spline-shaped portions engaged with each other are formed on an inner peripheral surface of a hub mounting hole 4 provided in the center of a wheel disc portion 3, and on an outer peripheral surface of an axle projecting portion projecting out from a hub 5 in an axle side. The spline-shaped portions alternately repeat recessed groove portion and protrusion portions extending in an axle direction, in a circumferential direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle wheel mounting structure capable of accurately mounting a vehicle wheel and an axle without impairing mounting workability.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6 (A), a vehicle wheel is mounted on an axle by concentricly connecting a hub b on the axle side to a hub mounting hole a1 provided at the center of a wheel disc portion a. The axle protruding portion b1 protruding to the position is fitted and aligned, and thereafter, in this state, the bolt provided on the hub b is fixed by fixing the nut.

At this time, if the play (play) between the hub mounting hole a1 and the axle protruding portion b1 is large, the vehicle wheel and the axle are vertically deviated from each other to induce vehicle vibration during traveling. There is a problem.

Therefore, in the conventional art, by tightly fitting the hub mounting hole a1 and the axle projection b1 to each other, the play is eliminated and the misalignment between them is prevented. At this time, in order to avoid that the resistance at the time of fitting becomes large and the wheels cannot be mounted / removed, the fitting width w in the axle direction between them is set to be very narrow, about 1 to 2 mm.

[0005]

However, due to the tight fitting and the narrow fitting width w, the hub mounting hole a as shown in FIG. 6 (B) is formed.
1 and the axle protruding portion b1 are apt to be slantedly fitted to each other,
The vehicle wheel and the axle tend to be misaligned obliquely. Particularly in a vehicle wheel, since the disk portion a is offset to the outside of the vehicle, its own weight causes a moment m in the axial direction about the hub mounting hole a1 as a fulcrum.
Occurs, and therefore the occurrence of the above-mentioned oblique core misalignment becomes more remarkable.

Therefore, according to the present invention, spline-shaped portions, in which concave groove portions and ridge portions extending in the axial direction are repeated in the circumferential direction, are provided on the inner peripheral surface of the hub mounting hole and the outer peripheral surface of the axle protruding portion. Even if the play and the fitting width are sufficiently secured to avoid the misalignment due to slanting and the difficulty of mounting / removing due to the large fitting resistance, It is an object of the present invention to provide a vehicle wheel mounting structure capable of effectively suppressing vertical misalignment due to the play and enhancing mounting accuracy without impairing workability.

[0007]

In order to achieve the above object, the invention of claim 1 of the present application is such that the hub mounting hole of a vehicle wheel provided with a hub mounting hole at the center of the wheel disc portion is provided on the axle side. A vehicle wheel mounting structure for mounting an axle by fitting an axle projecting portion projecting concentrically from a hub, wherein a recess extending in an axle direction is formed on an inner peripheral surface of the hub mounting hole and an outer peripheral surface of the axle protruding portion. A spline for preventing misalignment in which a groove portion and a ridge portion are alternately repeated in the circumferential direction, and the concave groove portion and the ridge portion on the hub mounting hole side engage with the ridge portion and the concave groove portion on the axle protrusion side. It is characterized in that the shaped portion is formed.

Further, in the invention of claim 2, the engagement width W in the axle direction with which the hub mounting hole and the axle protrusion are engaged is 4
It is characterized in that it is 10 mm and the number of repeating pitches of the concave groove portion and the convex stripe portion is 10 to 200.

According to the third aspect of the invention, the diameter difference D between the inner diameter Di of the hub mounting hole and the outer diameter Do of the axle protruding portion is D.
i-Do is characterized by being 0.2 to 1.0 mm.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.
This will be described together with the illustrated example. FIG. 1 is a sectional view showing a mounting state of a vehicle wheel and an axle, and FIG. 2 is a sectional view showing a state before mounting a main part.

1 and 2, the vehicle wheel mounting structure is such that the hub mounting hole 4 of the vehicle wheel 1 has a hub mounting hole 4 formed at the center of the wheel disk portion 3.
And an axle protruding portion 6 concentrically protruding from the hub 5 on the axle 2 side.
Have been inserted.

The axle 2 is provided at the front end of the axle body 2A.
It has a well-known structure in which a brake rotor 7 is integrally attached via a hub 5, and a front end of a flange of the hub 5 is provided with an axle projecting portion 6 projecting concentrically with the axle 2 and a plurality of portions arranged at equal intervals around the axle protruding portion 6. Four (for example, four) vehicle wheel fixing hub bolts 8 are provided in a protruding manner.

The vehicle wheel 1 has an annular rim 11 for mounting and holding tires, and a wheel disc portion 3 for mounting the axle 2, and the wheel disc portion 3 has the axle protrusion at the center thereof. A hub mounting hole 4 is formed by fitting the portion 6 into the hub mounting hole 4. Further, the wheel disc portion 3 is provided with a bolt insertion hole 12 at a position matching the hub bolt 8 for inserting the hub bolt 8 and fixing the nut.

In the present embodiment, the spline-shaped portion 1 for preventing misalignment, which can engage with both the inner peripheral surface of the hub mounting hole 4 and the outer peripheral surface of the axle protruding portion 6, is provided.
3A and 13B are formed.

The spline-shaped portions 13A and 13B are formed by alternately repeating the groove portions 14 and the ridge portions 15 extending in the axial direction in the circumferential direction, as shown in an exaggerated cross section perpendicular to the axial direction in FIG. 14A of the spline-shaped portion 13A which is formed by the
And the ridge portion 15A and the ridge portion 15B and the groove portion 14B of the spline-shaped portion 13B on the side of the axle protrusion 6,
Engage with each other.

That is, the concave groove portion 14A and the convex stripe portion 15
The ridges 15B and the concave groove portions 14B have the same number of pitches, and the cross-sectional shapes thereof are substantially the same or similar. Further, the unevenness height HA between the concave groove portion 14A and the convex stripe portion 15A is apparently represented by a diameter difference Di-Do between the inner diameter Di of the hub mounting hole 4 and the outer diameter Do of the axle protruding portion 6. It is set to be larger than 0.5 times the play amount δ1 of.

Such spline-like portions 13A, 13
In B, as shown in an exaggerated manner in FIG. 4, since the concave groove portion 14 and the ridge portion 15 engage with each other and interfere with each other, the substantial play amount δ2 should be reduced from the apparent play amount δ1. You can

Therefore, by securing the apparent play amount δ1, the fitting resistance can be kept low and the mounting / removing performance can be improved, while the substantial play amount δ2 can be effectively suppressed to prevent the vertical misalignment.

Further, due to the reduction of the fitting resistance, the engagement width W in the axle direction between the spline portions 13A and 13B (see FIG. 1).
Is shown in FIG.
It can be increased to a range of 10 mm. As a result, it is possible to prevent an oblique misalignment such as the hub mounting hole 4 and the axle protruding portion 6 being sluggishly fitted together. In particular, the spline-shaped portions 13A and 13B include the concave groove portion 14 and the ridge portion 1.
Since 5 also functions as a guide when fitting,
It is possible to further enhance the effect of preventing the tiredness and the effect of improving the mounting / removing performance.

Here, the apparent play amount δ1 (corresponding to the diameter difference Di-Do) is 0.2 to 1.0 mm from the viewpoints of mounting / removing performance and suppressing vertical misalignment. preferable.

Further, the number of repeating pitches of the concave groove portions 14 and the convex stripe portions 15 is 10 to 10 from the viewpoint of accuracy and strength (durability).
It is preferable that the number is 200.

Further, the unevenness height HA is determined by the concave groove portion 14B.
It is preferable that it is approximately equal to the unevenness height HB between the ridge and the convex streak portion 15B and is 1.5 to 10 mm from the viewpoint of accuracy and strength (durability).

In this embodiment, the cross-sectional shape of the concave groove portion 14 and the convex stripe portion 15 is preferably a substantially triangular shape. However, for example, a rectangular shape or a trapezoidal shape (shown in FIG. 5), Alternatively, an arc curve, a sine curve, etc. can be adopted as required.

Further, as shown in FIG. 3, it is preferable that the bolt insertion hole 12 provided in the wheel disc portion 3 be an ellipse elongated in the circumferential direction in consideration of the engagement between the spline portions 13A and 13B. At that time, the angle pitch α between the arc centers of the ellipses centered on the axis is equal to or greater than the angle pitch β centered on the axes of the groove 14 and the ridge 15, for example, 1.0 to 1.5 times. It is good to say

As described above, in the vehicle wheel mounting structure of the present application, vertical and diagonal misalignment between the hub mounting hole 4 and the axle protrusion 6 can be prevented, and the core accuracy can be improved. R around the axle due to mounting
It is possible to suppress deterioration of uniformity such as RO.

Although a particularly preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the illustrated embodiment and, for example, in addition to passenger vehicles, RV vehicles, commercial vehicles, light truck vehicles. The present invention can be implemented by being modified into various modes such as being applicable to vehicles of various categories such as heavy-duty vehicles.

[0027]

EXAMPLE A vehicle wheel was mounted using a vehicle wheel and an axle having the specifications shown in Table 1, and the mounting difficulty at that time, the occurrence of vertical misalignment and oblique misalignment with the axle, Also, we checked the presence or absence of vibration when driving in an actual vehicle.

[0028]

[Table 1]

As shown in the table, in the examples, the mounting accuracy can be improved by preventing the occurrence of the center misalignment in the vertical direction and the oblique misalignment with the axle while facilitating the mounting of the vehicle wheel and suppressing the vehicle vibration. You can see that

[0030]

As described above, according to the present invention, since the spline-shaped portions are formed on the inner peripheral surface of the hub mounting hole and the outer peripheral surface of the axle protruding portion so as to be engageable with each other, play and fitting are possible. Even if a sufficient width is secured and the difficulty of mounting / removing due to slanted core misalignment due to unsteadiness and large fitting resistance is avoided, vertical misalignment due to the play is effectively suppressed. The mounting accuracy can be improved without impairing workability.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state before attachment of a main part thereof.

FIG. 3 is a diagram illustrating a cross-sectional shape of a spline-shaped portion.

FIG. 4 is a diagram illustrating the operation and effect thereof.

FIG. 5 is a diagram showing another example of the cross-sectional shape of the spline-shaped portion.

6A and 6B are diagrams for explaining a conventional technique.

[Explanation of symbols]

1 Vehicle wheel 2 axles 3 wheel disc part 4 Hub mounting hole 5 hubs 6 axle protrusion 13A, 13B Splined part 14 Groove 15 ridge

Claims (3)

[Claims] 1. A vehicle wheel for mounting an axle by fitting an axle projecting portion projecting concentrically from a hub on the axle side into the hub mounting hole of a vehicle wheel having a hub mounting hole at the center of the wheel disc portion. A mounting structure, in which an inner peripheral surface of the hub mounting hole and an outer peripheral surface of the axle protruding portion are alternately circumferentially repeated with concave grooves and ridges extending in the axial direction, and the hub mounting hole A vehicle wheel mounting structure, characterized in that a spline-like portion for preventing misalignment is formed so that the concave groove portion and the convex groove portion on the side engage with the convex groove portion and the concave groove portion on the axle protruding portion side. 2. The engagement width W in the axle direction with which the hub mounting hole and the axle protrusion are engaged is 4 to 10 mm, and the number of repeating pitches between the groove and the ridge is 10 to 20.
2. The vehicle wheel mounting structure according to claim 1, wherein the number is zero. 3. A diameter difference Di-Do between an inner diameter Di of the hub mounting hole and an outer diameter Do of the axle protruding portion is 0.2 to.
The vehicle wheel mounting structure according to claim 1 or 2, wherein the mounting structure is 1.0 mm.