JPH0828542A - Burglarproof device for wheel for automobile - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a burglary accident of a wheel by preventing removal of the wheel from the hub bolt of an automobile except the jointly use of a special hub nut and a rotation operation tool for exclusive use. CONSTITUTION:The drum part of a hub nut N fastened to the hub bolt of a wheel for an automobile is formed in a lock surface for rotation operation in a pseudo equilateral triangular having one side consisting of a protrusion curved part 16a. A key groove 17 paralleling a rotary axis is notched in one side, the two sides, or the three sides of the lock surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle wheel antitheft device.

[0002]

2. Description of the Related Art In order to prevent the theft of automobile wheels from being stolen, a well-known technique in which a hub nut fastened to a hub bolt thereof is specially modified is disclosed in Japanese Utility Model Laid-Open No. 58-119612.
And No. 61-44016, which are considered to be the closest to the present invention.

[0003]

However, in the above-mentioned Japanese Utility Model Laid-Open No. 58-119612, the outer peripheral surface (4) of the bag nut body (1) is still circular even if it is shaped into a tapered taper surface. The engagement groove (6) that is recessed from the circular outer peripheral surface (4) faces the 180 degrees of the recessed groove portions as a whole as a concave and convex tooth pattern, so that commercially available pliers etc. It can be grabbed by and can still be rotated.

Also, the engaging recess (5) is exposed at the tip of the bag nut body (1), and the inner peripheral surface of the engaging recess (5) is also depressed at a corresponding position of 180 degrees. Since it has a square shape, there is a concern that it will be rotated by the common use of forked forks.

Furthermore, when the bag nut body (1) is rotated by a regular cap (2), as is apparent from FIG. 2, the engaging recesses (5) and the engagements on the bag nut body (1) side. The mating groove (6) and the engaging protrusions (8) and (9) on the side of the cap (2) have to be engaged with each other for rotation operation.

That is, since the outer peripheral surface of the bag nut body (1) is circular, the surface pressure (rotation torque of the wrench) of the cap (2) during the rotating operation with respect to the entire bag nut body (1). Is impossible to act, and the surface pressure partially acts only on the meshing surface.

As a result, it is difficult to rotate the bag nut body (1) properly and smoothly even if the cap (2) is properly used, and it is easy for the meshing portion to be deformed or damaged. There is also a problem that the durability of the nut body (1) is reduced.

On the other hand, since the wheel nut (1) of Japanese Utility Model Laid-Open No. 61-44016 is provided with the polygonal engaging portions (3) and (13), the outer peripheral surface of the wheel nut (1) is tapered (3a).
Even if it is formed in (13a), a commercially available wrench can be directly locked, and there is a risk that it will be rotated without using the rotating member (6).

In this respect, in the case of the embodiment shown in FIG. 3,
Although the polygonal engaging portion (13) is engraved in a spline shaft type, it is rotated by ordinary pliers or pliers because the concave groove portions are distributed corresponding to the opposite positions of 180 degrees. I have to say there is room.

Further, in the engraved form of the polygonal engaging portions (3) and (13), it is difficult to prepare various kinds of anti-theft wheel nuts (1) as a so-called key difference.

[0011]

SUMMARY OF THE INVENTION The present invention intends to improve such a problem. Therefore, the body of the hub nut, which is fastened to the hub bolt of the automobile wheel, has a structure of one.
The side is formed as a locking surface for rotation operation of a pseudo equilateral triangle having a convex curved surface portion, and one side, two sides, or 3 of the locking surface is formed.
A key groove parallel to the axis of rotation is cut out on the side.

[0012]

According to the above-mentioned structure of the present invention, the locking surface for rotational operation of the hub nut is shaped into a pseudo equilateral triangle having a convex curved surface portion on one side thereof, as if to remind the rotor shape of a rotary engine. It is impossible to rotate the hub nut by locking a commercially available wrench or pliers.

Further, since a key groove is cut out on one side, two sides, or three sides of the rotation operation engaging surface forming the above pseudo equilateral triangle so as to be depressed from the convex curved surface portion, this is a provisional command. Even if it is engraved on three sides, its key groove 18
Since they do not face each other at 0 degree, it is impossible to lock ordinary gripping tools such as pliers and forked forks.

As a result, it is possible to completely prevent the theft of automobile wheels and to prepare various hub nuts as key differences easily and abundantly depending on the number and arrangement of the key grooves. There is also an effect that can be done.

The hub nut can be rotated for the first time by using a special wrench or adapter socket having a special shape that fits the above-mentioned pseudo equilateral triangle locking surface for rotation operation. Since the surface pressure (rotational torque) acts not only on the key groove of the hub nut but also on the apex of the above-mentioned pseudo equilateral triangle, there is a risk that the opening edge of the key groove will be deformed or even lost. The hub nut can be smoothly and correctly rotated under extremely high surface pressure.
Its operability and hub nut durability are also outstanding.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete constitution of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a mounting state of an automobile wheel (W), and (11) is an integral part of an axle hub (12). Hub bolts (stud bolts) that are planted in a
(D) is a wheel disk, and a plurality of disk mounting holes (14) for receiving the hub bolts (11) are provided around the shaft hole (13) with a fixed P. C. D (Pit
The apertures are distributed on the ch Circle Diameter).

(15) is each disk mounting hole (14)
The bush press-fitted in (N) is the hub (1) of the above axle.
In order to fix the wheel disk (D) to 2),
The hub nuts are fastened to the respective hub bolts (11), and in the present invention, they are plastically worked into a special shape as shown in FIGS. 2 to 5 in order to prevent the wheel (W) from being stolen.

That is, the outer peripheral surface of the body portion of the hub nut (N) has a pseudo equilateral triangular rotation engaging surface (a side having a convex curved surface portion 16a) as if it were a rotor shape of a rotary engine. 16). Each apex angle is larger than 60 degrees, and the intersection angle (α) between the adjacent bisectors is set to about 120 degrees.

Moreover, a line segment (L1) that bisects each apex angle
And a line segment (L2) connecting adjacent vertices have a constant radius of curvature with the same length, the convex curved surface portion (16a) of one side is formed in an arc shape.

(17) is a locking surface (16) for the rotation operation
Key grooves cut out on three sides of the hub nut (N) as a concave curved form having a radius of curvature smaller than that of each convex curved surface portion (16a) of the key groove.

In this respect, the basic embodiment shown in FIGS.
The above-mentioned key grooves (17) are arranged on the respective bisectors of the pseudo equilateral triangle, but as suggested by the first to fourth modified examples of FIGS. The aperture may be distributed in positions that are slightly deviated in the clockwise or counterclockwise direction from the line of division.

The basic embodiment of FIGS. 2 to 5 and FIGS.
In the first to fourth modified examples of the above, a total of three of the above keyways (1
Although the openings 7) are distributed in the openings at 120 degrees which are equal to each other at the adjacent crossing angles (β), they may be arranged at random at the crossing angles (β).

Further, as is apparent from the fifth modified embodiment of FIG. 10, the keyway (17) is cut out on only one side of the rotation operation locking surface (16), or is similarly cut out on two sides. In addition, as shown in the sixth modified embodiment of FIG. 11, several key grooves (17) are cut out on each side, or, as suggested by the seventh modified embodiment of FIG. It is also possible to cut out in a mixed state with one and several pieces, and depending on the number and arrangement of such key grooves (17), it is easy and abundant as various hub nuts (N) with different keys. It can be prepared and prepared.

Reference numeral (18) is a mounting seat surface formed as a conical shape on the base end portion of the hub nut (N), and serves to perform an aligning action with the bush (15). (19) is a receiving stopper that forms a boundary between the mounting seat surface (18) and the rotation operation locking surface (16), and the locking surface (16)
Is formed in a circular shape having a diameter larger than the virtual circumscribed circle, and receives and regulates an adapter socket or wrench described later.

On the other hand, the tip portion of the hub nut (N) is formed as a decorative head (21) for covering the female screw (20) in a circular shape having a diameter smaller than the virtual circumscribing circle of the rotating operation locking surface (16). In addition, the boundary between the locking surface (16) and the decorative head (21) is smoothly continuous as a conical shoulder surface (22) for guiding the insertion of an adapter socket or wrench, which will also be described later. .

That is, the hub nut (N) is shaped as a so-called bag nut, but as long as the hub nut (N) is provided with the lock surface (16) for rotation operation and the key groove (17) of the above-mentioned pseudo equilateral triangle, As shown in the eighth modified example of No. 13, the formation of the decorative head (21) is omitted, and the female screw (20) is formed.
It is okay to expose the from the tip of the hub nut (N).

Next, FIGS. 14 and 15 show the rotating operation state of the hub nut (N), and in operation, the fitting surface of the pseudo equilateral triangle corresponding to the locking surface (16) of the hub nut (N). It goes without saying that a special dedicated adapter socket (S) having (23) and a key protrusion (24) which also fits the key groove (17) is prepared in advance. Reference numeral (25) is a locking projection that is formed on the tip of the adapter socket (S) so that it can be locked by a rotary operation tool (T) such as a commercially available hexagonal wrench. It is like this.

When rotating the hub nut (N), the hub nut (N) is screwed onto the hub bolt (11) which is erected from the hub (12) of the axle as shown in FIGS. In addition, the adapter socket (S) is inserted into the hub nut (N) and fitted over, and the rotary operation tool (T) such as a hexagon wrench is attached to the locking projection (25) of the adapter socket (S). The hub nut (N) is tightened and fixed to the hub bolt (11) by locking the tool (T) and rotating the tool (T). After that, not only the tool (T) but also the adapter socket (S). Also pull out from the hub nut (N).

Then, the rotational torque of the tool (T) is not only the key groove (17) of the hub nut (N) but also the surface pressure of the adapter socket (S) with respect to the hub nut (N), which is the pseudo positive value. Since it also acts on the vertices of the triangle, the entire hub nut (N) can be smoothly and correctly rotated, and the meshing portion with the key groove (17) can be deformed improperly, or even lost. There is no danger of

The rotation operation engaging surface (16) of the hub nut (N) has a pseudo equilateral triangle shape, and the key groove (17) is notched so as to be depressed from the convex curved surface portion (16a). Therefore, it is impossible to rotate the hub nut (N) in a direction to loosen it without using the special adapter socket (S) that exactly matches this. It is possible to completely prevent the theft accident of the wheel (W).

The hub nut (N) can be directly rotated by omitting the combined use of the adapter socket (S) and using a special dedicated wrench or other rotary operation tool instead of the adapter socket (S). Of course, it may be set.

[0032]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the wheel (W) is constructed as an antitheft device for automobile wheels because of its structure.
The body portion of the hub nut (N) that is fastened to the hub bolt (11) is shaped as a locking face (16) for rotation operation of a pseudo equilateral triangle having a convex curved surface portion (16a) on one side, and
Since the key groove (17) parallel to the rotation axis is cut out on one side, two sides or three sides of the locking surface (16), there is an effect that the problems of the prior art mentioned at the beginning can be completely improved. .

That is, according to the above-mentioned configuration of the present invention, the rotation operation locking surface (16) of the hub nut (N) resembles the rotor shape of the rotary engine, and the convex curved surface portion (16a) of one side thereof. It is impossible to rotate the hub nut (N) by locking a commercially available wrench, pliers, etc. because it is formed into a pseudo equilateral triangle.

Further, a keyway (17) is formed on one side, two sides or three sides of the rotation operation engaging surface (16) forming the above pseudo equilateral triangle so as to be depressed from the convex curved surface portion (16a). Since it is cut out, even if this is engraved on the three sides of the provisional decree, it will not face the 180 degrees of the key groove (17) comrades, and from that meaning also common grips such as pliers and forked forks It is impossible to lock the tool.

As a result, it is possible to completely prevent the car wheel (W) from being stolen, and the various hub nuts (N) as the key difference are replaced by the key groove (1).
Depending on the number and arrangement of 7), there is an effect that abundant and easy preparations can be made.

The above-mentioned pseudo equilateral triangle locking surface for rotation operation (1
It is possible to rotate the hub nut (N) for the first time by using a special-shaped special wrench compatible with 6) or an adapter socket (S), but at that time, the surface pressure (rotation torque) of the wrench. Acts not only on the key groove (17) of the hub nut (N) but also on the apex of the above-mentioned pseudo equilateral triangle, so that the opening edge of the key groove (17) may be deformed illegally or even dropped. Since the hub nut (N) can be smoothly and correctly rotated under extremely high surface pressure, the operability and the durability of the hub nut (N) are remarkably excellent.

In particular, if the configuration of claim 2 is adopted,
The above effect can be achieved more rigorously, and the hub nut (N) can be simplified as a necessary structure.

Further, if the structure of claim 3 is adopted, the rotational torque of the hub nut (N) can be further applied without loss along the rotational axis of the hub nut (N), and the rotational operation can be performed correctly and smoothly. is there.

Further, if the configuration of claim 4 is adopted,
Commercially available gripping tools such as pliers cannot be locked in the key groove (17) more and more, and the number and arrangement of the key groove (17) on each side of the locking surface (16) are notched. It becomes easier to change the difference, etc., and it is possible to prepare various hub nuts (N) in abundance.

[Brief description of drawings]

FIG. 1 is a side sectional view of a wheel attached state to which the present invention is applied.

FIG. 2 is a front view showing a hub nut extracted.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a sectional view taken along line 4-4 of FIG.

5 is a sectional view taken along line 5-5 of FIG.

FIG. 6 is a sectional view showing a first modified embodiment of the hub nut corresponding to FIG.

FIG. 7 is a sectional view showing a second modified embodiment of the hub nut in the same manner.

FIG. 8 is a sectional view showing a third modified embodiment of the hub nut.

FIG. 9 is a sectional view showing a fourth modified embodiment of the hub nut.

FIG. 10 is a sectional view showing a fifth modified embodiment of the hub nut.

FIG. 11 is a sectional view showing a sixth modified embodiment of the hub nut.

FIG. 12 is a sectional view showing a seventh modified embodiment of the hub nut.

13 is a sectional view showing an eighth modified example of the hub nut corresponding to FIG.

FIG. 14 is a side sectional view showing a rotating operation state of the hub nut.

FIG. 15 is a sectional view taken along line 15-15 of FIG.

[Explanation of symbols]

 (11) · Hub bolt (16) · Locking surface for rotation operation (16a) · Convex curved surface portion (17) · Key groove (W) · Wheel (L1) · Bisecting line (L2) · Line connecting vertices Minute (β) / Crossing angle

Claims (4)

[Claims] 1. A hub bolt (1) for an automobile wheel (W).
The body portion of the hub nut (N) to be fastened to 1) is shaped as a rotation operation locking surface (16) of a pseudo equilateral triangle whose one side is a convex curved surface portion (16a), and the locking surface (16 ) An antitheft device for a vehicle wheel, characterized in that a key groove (17) parallel to the axis of rotation is cut out on one side, two sides or three sides of (1). 2. A line segment (L1) that bisects a pseudo equilateral triangle in the same manner as a line segment (L2) that connects adjacent sides of the pseudo equilateral triangle to one side of the rotation operation locking surface (16). The anti-theft device for a vehicle wheel according to claim 1, wherein the anti-theft device is formed as a convex curved surface portion (16a) having a radius of curvature having the same length. 3. A key groove (17) is cut out on three sides of a locking surface (16) for rotation operation so as to have an evenly distributed distribution of adjacent crossing angles (β). The antitheft device for a vehicle wheel according to 1. 4. A keyway (17) is provided with a locking surface (1) for rotation operation.
The antitheft device for a vehicle wheel according to claim 1, wherein the antitheft device for a vehicle wheel is cut out in a concave curved shape having a smaller radius of curvature than the convex curved surface portion (16a) of 6).