JPH0424178Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an improvement in the cap of an automobile tire wheel tightening nut (hereinafter simply referred to as a nut).

``Prior Art'' Conventionally, a cap consisting of a hexagonal side part that fits into the hexagonal side part of this type of nut and a semicircular arc-shaped cap part that bulges out from the hexagonal side part is fitted onto the nut. As a device for attaching the cap, a hexagonal spring member having spring pieces at at least three places is attached to the inner wall surface of the hexagonal side of the cap, and this hexagonal spring member is fixed with a screw (setting screw). There are structures in which a spring member is wrapped around the inner wall of the cap, and structures in which cushion rubber is attached to the hexagonal sides of the cap and the cushion rubber is wrapped around the inner wall of the cap.

In these structures, a hexagonal spring member or cushion rubber is press-fitted to the side of the nut's head, and the entire spring member (especially the spring piece) is plastically deformed, and the repulsive force is used to deform the entire spring member. This is a method of fitting a cap onto a nut, and such devices and methods have been common. In addition, as a technical document similar to the present invention, there is a resin hub nut cap disclosed in Japanese Utility Model Application Publication No. 57-54723.

This invention has a structure in which at least one elastically deformable abutting protrusion (abutting part) is provided on the inner wall surface of the hub nut.

``Problems to be solved by the invention'' The conventional devices and methods described above have a structure in which a spring member or cushion rubber is interposed on the entire inner wall surface of the cap, which requires manufacturing time and parts. The cost is high, and ultimately the cost of the cap is high.Also, since several spring members are installed on the inner wall of the cap, it is difficult to fit, requiring unexpected effort and time. Therefore, there is a strong need for improvement. In the above-mentioned technical document, the abutment protrusion has an integral structure with the hub nut body, cannot be attached or detached, and cannot be replaced if damaged. In addition, the structure of the hub nut cap is complicated, and manufacturing requires time and skill. Furthermore, in this invention, the abutting protrusion has the same protruding size as the other abutting parts, and when the hub nut is attached, the hub nut is biased to the nut, and when the hub nut is attached, the problem occurs when driving at high speed.
There is a risk of it coming off.

"Means for Solving the Problems" In view of the above, the present invention aims to simplify the cap manufacturing process and provide a cap structure that is easy to manufacture. Or, if there is a risk that the spring member may come off the nut due to fatigue, etc., the structure should be such that the spring member can be replaced and reused. For this purpose, the following configuration was adopted.

That is, the present invention is a cap having a large number of ribs on the inner wall surface to be fitted into a nut for tightening an automobile tire wheel, and ribs arranged in parallel on at least one side of the inner wall surface of the polygonal side portion of the cap. A pair of locking pieces are provided, the locking pieces are press-fitted to the locking pieces through the bulging portion of a spring member having a spring piece, and the spring member is detachably attached to the locking pieces,
This cap for a nut for tightening a tire wheel of an automobile is characterized in that the spring piece of the spring member is configured to protrude from a large number of ribs provided on other sides of the inner wall surface of the cap.

"Operation" Next, to explain the operation of the present invention, the opening of the cap is brought into contact with the nut into which the cap is to be fitted, and force is applied to the cap to push it in the axial direction of the bolt (the bolt onto which the nut is screwed). Then, the spring piece, which is provided on one side of the hexagonal side of the cap and protrudes from the rib on the inner wall surface of the cap, is pressed against the hexagonal side of the nut. As a result, the spring piece is biased toward the inner wall surface of the cap, and in this case, since the spring piece is attached so as to be on the same plane as the locking piece, the other sides of the hexagonal side of the cap (If sides other than the above-mentioned one side are collectively referred to, they will simply be referred to as "other sides.") This will be substantially on the same plane as the rising end surface of the rib provided on the side, and a sufficient opening will be formed. Thereafter, as described above, the spring piece urged toward the inner wall surface rebounds, and the cap is firmly fitted to the hexagonal side of the nut by this repulsive force.

In addition, when the spring piece is biased so as to be on the same plane as the locking piece as mentioned above, it will be on the same plane as the rising edge of the rib provided on the inner wall of the cap, and a sufficient opening will be formed. Ru. Therefore, the cap can be fitted without being eccentric with respect to the axis of the nut, which is the problem caused by providing a spring member on one side of the cap. Therefore, even if the axle rotates at high speed and the nut rotates at high speed at the same time, the cap will not move blindly, and various problems caused by this, such as detachment of the cap and rattling, can be avoided. be.

“Embodiment” An embodiment of the present invention will be described in detail below based on the drawings. 1 is a hexagonal side portion 2 of a similar shape that is fitted into a hexagonal side portion of a nut (not shown); A cap consisting of a semicircular arc-shaped bulge 3 that hides the head bulged from the hexagonal side 2,
The rising dimensions of the hexagonal side 2 of this cap 1 are:
Normally, it is different depending on whether it is for the front wheel or the rear wheel.

A spring member 5 having a spring piece 4 and a bulging portion 5a that is press-fitted between one side 2a of the inner wall surface 12 of the hexagonal side portion 2 and the locking pieces 7, 7 is provided. In addition, when the base portion 4a of this spring piece 4 is provided in the cap 1, the upright dimension of the base portion 4a (the dimension from the inner wall surface 12 of this piece 2a to the surface of the base portion 4a) is equal to the hexagonal side. Ribs 6 protruding from the inner wall surface 12 of the adjacent side 2c of 2 and the other side 2b
The vertical dimension is approximately the same as that of . This results in
An opening B having substantially the same diameter as the center part A of the cap 1 is formed in the hexagonal side part 2. The spring member 5 ideally has two types of shapes, as shown in FIGS. 5 and 6, for example. In the example shown in FIG. A spring piece 5 is punched out from this bulging portion 5a and expands toward its free end. Specifically, when this spring member 5 is attached to the cap 1, its free end becomes Center A of cap 1
It is configured to be displaced in the direction. Another example is the one shown in FIG. 6, in which a spring piece 4 is provided through the base portion 4a, and this spring piece 4 has an expanded shape toward its free end. Specifically, when the spring member 5 is attached to the cap 1, its free end is displaced toward the center A of the cap 1. Further, a bulged portion 5a is formed at approximately the center of the spring member 5 in the lateral direction. In the example of FIG. 6, the bulging portion 5 of the spring member 4
As shown in FIG.
2 and the locking pieces 7, 7, the base portion 4a is above the locking pieces 7, 7, and the spring piece 4 is positioned between the locking pieces 7, 7. establish.

The spring member 5 configured in this way is attached to adjacent sides 2a that sandwich one side 2a of the inner wall surface 12 of the cap 1.
c, 2c, it is provided on a pair of locking pieces 7, 7 facing each other with a certain distance C on this side 2a, and the spring piece 4 is located between the locking pieces 7, 7. be. Then, through the repulsion of the bulging portion 5a of the spring member 5, the locking pieces 7, 7 and the inner wall surface 12
It is press-fitted between the In this case, as described above, an opening B is formed in the inner wall surface 12 of the hexagonal side 2 from the center A of the cap 1, having the same size and similar shape to the nut head. Further, the free end of the spring piece 4 expands toward the center A of the cap 1 as it goes downward from the base portion 4a, and the free end of the spring piece 4 expands toward the center A of the cap 1. It is located at the center A of the cap 1 from the upper end surface 6a. As a result, the spring piece 4 is temporarily pressed against the hexagonal side of the nut, but then rebounds, so
This kind of cap 1 is reliably fitted into the nut by the repulsive force. Note that this spring member 5 is fixed to the inner wall surface 1 by a set screw or the like (not shown).
It is also possible to have a configuration in which the holder is fitted onto the holder 2.

Next, to explain the operation of the present invention, the opening B of the cap 1 is inserted into the nut into which the cap 1 is to be fitted.
to touch. In this case, the vertical dimension of the base portion 4a of the spring piece 4 of the spring member 5 provided on one side 2a of the inner wall surface 12 of the cap 1 is the hexagonal side 2a.
The opening B is formed in the cap 1 to have approximately the same dimensions as the upright dimension of the rib 6 protruding from the inner wall surface 12 of the nut, and the opening B is formed in the cap 1 and has an approximately similar size to the hexagonal side of the nut. By pressing the cap 1 after contacting the cap B with the hexagonal side of the nut, the cap 1 can be smoothly fitted into the nut.

After that, when you apply force to the cap 1 and press it in the axial direction of the nut, one side 2 of the hexagonal side 2 of the cap 1
a, and in the center A of the cap 1, the spring piece 4, which widens slightly towards its bulge 3, is pressed against the head of the nut. As a result, the spring piece 4 is urged in the direction of the inner wall surface 12 of the cap 1, but at the same time, the spring piece 4 is repelled, and this repulsive force causes the cap 1 to firmly fit into the hexagonal side of the nut. It will be worn.

Further, as described above, when the cap 1 is press-fitted into the nut, the spring piece 4 is urged toward the inner wall surface 12 of the cap 1, and in this case, the spring piece 4 is pressed against the locking piece 7,
7, the other sides 2 of the hexagonal side 2 of the cap 1
b, 2c, .
The spring member 6 can be smoothly fitted onto the nut head, and the spring member 6 can only be attached to one side 2a of the cap 1.
In other words, the cap 1 is fitted without eccentricity with respect to the axis of the nut. Therefore, even if the axle rotates at high speed and the nut rotates at high speed at the same time, the cap 1 will not move blindly, and various problems caused by this, such as the cap 1
``Effects of the invention'' As described in detail above, the present invention has a structure in which a locking piece is provided on one side of the polygonal side of the cap, and a spring member is provided on this locking piece. It is.

Therefore, when manufacturing this type of cap, it is desirable to be able to separate the cap body and the spring member. In addition, the cap body can be manufactured in one step, and die cutting is easy. etc. simplification of production is achieved.

In addition, in this invention, on one side of the polygonal side of the cap,
The structure is such that the bulging portion of the locking piece is press-fitted.

Therefore, there is an effect that the spring member can be attached with one touch and reliably, or an effect that once attached, it will not come off easily.

Furthermore, the present invention has a structure in which the spring member protrudes from the rib.

Therefore, when this cap body is fitted onto a nut, there is an effect that the center of the nut and the cap body are aligned (an effect that allows the cap to be attached to the nut without being biased), and through this effect. Even when traveling at high speeds, the cap does not move blindly, and the cap can be prevented from coming off.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and Fig. 1 is a side view, Fig. 2 is a bottom view, Fig. 3 is a perspective view, and Fig. 4 is an enlarged bottom view of main parts showing another example. , FIG. 5, and FIG. 6 are perspective views each showing an example of a spring member. 1...cap, 2...hexagonal side, 2a...
One side, 2b...Other side, 2c...Adjacent side, 3...Bulging part, 4...Spring piece, 4a...Base part, 5...Spring member, 5a...Bulging part, 6...Rib , 6a...
...Rising end surface, 7,7...Locking piece, A...Center part,
B...Opening, C...Gap.

Claims (1)

[Scope of Claim for Utility Model Registration] A cap having a large number of ribs on the inner wall surface to be fitted into a nut for tightening an automobile tire wheel, the cap having a plurality of ribs on at least one side of the inner wall surface of the polygonal sides of the cap. A pair of locking pieces arranged in parallel is provided, and a spring member having a spring piece is press-fitted into the locking piece through a bulging portion thereof, and the spring member is detachably attached to the locking piece, and A cap for a nut for tightening a tire wheel of an automobile, characterized in that a spring piece of a spring member is configured to protrude from a plurality of ribs provided on other sides of an inner wall surface of the cap. A cap for a nut for tightening a tire wheel of an automobile according to claim 1, wherein the side on which the spring member is provided is one side of the polygonal side.