JP2005061547A - Nut with axial force control washer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bolt and nut structure capable of controlling axial force. <P>SOLUTION: This nut 10 with an axial force control washer comprises a first nut main body 11, a second nut main body 12 rotatable to the first nut main body and axially movable, a washer assembly 13 mounted between the first nut main body and the second nut main body and having an elastically deformable axial force control washer 14, and an axial force control washer bearer 15 for receiving the axial force control washer. A confirmation plate 16 for confirming the elastic deformation of the axial force control washer is mounted between the first nut main body and the washer assembly, and a protective plate 17 is mounted between the second nut main body and the washer assembly. This nut 10 with the axial force control washer is a hub nut of a wheel for an automobile. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a nut with an axial force management washer, and more particularly to a nut with an axial force management washer that can be used as a hub nut of an automobile wheel.

  As disclosed in JP 2000-085305 A and as shown in FIGS. 5 to 7, the wheel 1 is a hub bolt fixed to a hub 2 of an automobile (hereinafter also simply referred to as “bolt”). 3 is inserted into the nut hole of the wheel, and a hub nut 4 (hereinafter also simply referred to as “nut”) is screwed into the hub bolt 3 to be fixed to the hub 2. The nut 4 is tightened with a spanner or a torque wrench to press the nut seat surface 5 of the wheel. The force (axial force) attached to the hub 2 is managed by the torque of the nut 4. When the wheel 1 which is a product to be tightened is a straight hole, the seat surface of the nut is flat as shown in FIG.

However, the prior art has the following problems.
A. When used, it is normal for the nut seat surface to be worn or scratched. In torque management, even if the torque value when the nut is new and when the wheel is new and the torque value after the occurrence of scratches are the same, the scratched product will have the axial force (force that presses the product wheel). Will decline. As a result, a crack in the wheel occurs due to insufficient tightening force (axial force).
B. Since the user knows the above phenomenon, the nut may be tightened with a torque larger than necessary, and the safety strength of the hub bolt may be exceeded. In that case, the hub bolt is broken due to overtightening.
C. These insufficient axial forces and broken bolts occur because the conventional hub bolts and hub nuts have a structure that cannot manage the axial force.
JP 2000-085305 A

The problems to be solved by the present invention are insufficient axial force and excessive tightening, which are caused by the bolt / nut structure in which the axial force cannot be controlled.
An object of the present invention is to provide a bolt / nut structure capable of managing axial force.

The present invention for achieving the above object is as follows.
(1) a first nut body;
A second nut body that is rotatable with respect to the first nut body and movable in the axial direction, and is interposed between the first nut body and the second nut body, and is elastically deformable. A washer assembly having an axial force management washer and an axial force management washer cradle for receiving the axial force management washer;
Nut with axial force management washer equipped with.
(2) A confirmation plate for confirming an elastic deformation amount of the axial force management washer is interposed between the first nut body and the washer assembly, and the second nut body and the washer assembly. The nut with an axial force management washer according to (1), wherein a protective plate is interposed between the nut and the nut.
(3) The nut with an axial force management washer has a component set ring extending between the first nut body and the second nut body, and the second nut body includes the second set ring. The nut with an axial force management washer according to (1) or (2), wherein a groove for releasing a relative displacement between the nut main body and the component set ring is formed.
(4) The nut with an axial force management washer according to any one of (1) to (3), wherein the nut with an axial force management washer is a hub nut of an automobile wheel.

According to the nuts with axial force management washers (1) to (4) above, since the axial force management washer is provided, the axial force can be managed, and insufficient axial force and overtightening can be prevented.
According to the nut with an axial force management washer of (2) above, since the confirmation plate is provided, the elastic deformation amount of the axial force management washer can be confirmed.
According to the nut with an axial force management washer of (3) above, since the component set ring is provided, the component is assembled even though the nut with the axial force management washer is composed of a plurality of components.
According to the nut with an axial force management washer of (4) above, when the present invention is applied to a hub nut of an automobile wheel, breakage of the hub bolt and cracking of the wheel can be prevented.

The nut with an axial force management washer of the present invention will be described with reference to FIGS.
The nut 10 with an axial force management washer of the present invention is, for example, a hub nut of an automobile wheel. However, the nut 10 with the axial force management washer is not limited to the hub nut of the automobile wheel.

  As shown in FIG. 1, the nut 10 with an axial force management washer of the present invention is rotatable with respect to the first nut body 11 and the first nut body 11 and is movable in the axial direction (of the nut). A second nut body 12 and a washer assembly 13 interposed between the first nut body and the second nut body are provided. The washer assembly 13 includes an elastically deformable axial force management washer 14 and an axial force management washer cradle 15 that receives the axial force management washer. The axial force management washer 14 is annular and has a tapered or curved shape. The axial force management washer cradle 15 is in contact with the axial force management washer 14 at the tapered or curved portion of the axial force management washer 14. The axial force management washer 14 is elastically deformed so that the outer diameter of the axial force management washer 14 increases when an axial force is applied to the bolt 3. In order to facilitate this deformation, the axial force management washer 14 has one or more notches 14a (in the illustrated example, two provided at 180 ° facing portions) at the outer diameter side end portion. Also good. However, the notch 14a may not be provided.

The nut 10 with the axial force management washer includes a confirmation plate 16 interposed between the first nut body 11 and the washer assembly 13 for confirming the amount of elastic deformation of the axial force management washer 14, and a second plate. A protective plate 17 is interposed between the nut main body 12 and the washer assembly 13.
The nut 10 with an axial force management washer has a component set ring 18 extending between the first nut body 11 and the second nut body 12.
The second nut body 12 is formed with a groove 19 for releasing the relative displacement between the second nut body 12 and the component set ring 18 in the nut axial direction.
The first nut body 11, the confirmation plate 16, the axial force management washer 14, the axial force management washer cradle 15 and the component set ring 18 are components that do not rotate. The second nut body 12 is rotated when the nut is tightened.

The component set ring 18 has hook portions 18a and 18b at both ends. The component set ring 18 hooks the first nut main body 11 and the second nut main body 12 with the hook portions 18a and 18b, and the first nut main body 11, the confirmation plate 16, the axial force management washer 14, the axial force The five parts of the management washer cradle 15 and the second nut body 12 are made into one unit. The component set ring 18 is intended to prevent a user's component assembly procedure failure and forgetting to incorporate the component.
When the second nut main body 12 is rotated and tightened, the second nut main body 12 moves forward to the first nut main body 11 side. The component set ring 18 is not subjected to the axial force from the second nut body 12.

The first nut body 11 has a hole through which the hub bolt 3 is inserted, and does not screw into the hub bolt 3. The first nut body 11 applies the axial force of the hub bolt 3 to the nut seat surface 5 of the wheel 1. By tightening the second nut body 12 that is screwed onto the hub bolt 3, the bolt axial force is transmitted to the first nut body 11 through each component, and the wheel 1 is pressed against the hub 2.
The seat surface of the first nut body 11 and the nut seat surface 5 of the wheel 1 do not rotate with each other. Accordingly, it is possible to prevent the nut seat surface 5 of the wheel 1 from being worn or damaged.

The confirmation plate 16 has a scale on the surface on the side of the axial force management washer 14 of the confirmation plate 16 for grasping the outer diameter expansion amount and axial force of the axial force management washer 14 when the axial force is applied to the hub bolt 3. It is a marked plate. The confirmation plate 16 has a larger outer diameter than the circular protrusion surface (B surface in FIG. 2) on the axial force management washer 14 side of the second nut body 12. The proper outer diameter expansion position of the axial force management washer 14 is confirmed through the transparent part set ring 18 or through a window provided in the part set ring 18.
In addition, when the outer diameter of the axial force management washer 14 is at the proper outer diameter expansion position, the C surface of the axial force management washer 14 (confirmation plate facing surface) and the D surface of the confirmation plate 16 (axial force management washer facing surface) The distance between the C surface and the D surface is set so that they are just in contact with each other, and the E surface of the axial force management washer 14 (opposite surface of the axial force management washer base) and the F surface (axial force of the axial force management washer base 15). The distance between the E surface and the F surface is set so that the management washer facing surface) just contacts. As a result, it is possible to visually confirm that tightening is performed with an appropriate axial force, and at the same time, the structure can be experienced with the tightening force.

  The contact portion of the axial force management washer 14 and the axial force management washer pedestal 15 is a curved surface or a tapered surface (G surface). The axial force management washer 14 advances to the axial force management washer cradle 15 side while smoothly expanding the outer diameter starting from the G surface when an axial force is applied. The surface, E surface and F surface are just in contact. At this time, the outer diameter expansion amount of the axial force management washer 14 needs to be within the elastic deformation of the axial force management washer 14.

  The protection plate 17 is rotated while the second nut body 12 is accompanied by an axial force. Therefore, in order to protect the second nut body 12 and the axial force management washer 14, the second nut body 12 and the axial force management washer are protected. 14 is a plate that interposes a plate having a hardness slightly lower than 14 and extends the life of the second nut body 12 and the axial force management washer 14.

  The second nut body 12 is rotated by a spanner or a torque wrench and is tightened to press the first nut body 11 against the nut seat surface 5 through each component to generate an axial force. Attach to and fix. The groove 19 has a width (width in the bolt axis direction) equal to or greater than the distance between the C surface and the D surface in a state before the axial force is applied.

Next, the operation and effect of the nut with an axial force management washer of the present invention will be described.
Since the nut is divided into the first nut body 11 and the second nut body 12, and the first nut body 11 is simply pressed against the nut seat surface 15 without rotating, the nut seat surface 15 of the wheel is provided. Scratches, cracks and wear are less likely to occur, making it a durable wheel.
In addition, since the washer assembly 13 having elasticity in the bolt axial direction is interposed between the first nut body 11 and the second nut body 12, the change in the axial force applied to the nut seat surface 15 of the wheel can be reduced. The product (wheel) can be tightened with a constant axial force.
Further, since the axial force of the washer assembly 13 can be managed, cracks in the disc wheel 1 due to insufficient tightening force and breakage of the hub bolt 3 due to excessive tightening are eliminated.

Since the axial force management washer washer 14 is used within the elastic deformation, it generates a spring effect and the bolt 3 and the second nut body 12 are not easily loosened.
Even if slack occurs, it can be visually confirmed that the outer diameter of the axial force management washer 14 has been reduced, so that it can be tightened at the initial stage and retightened at the time of inspection.
In addition, since the disc wheel 1 is attached to the hub 2 with a structure that can be confirmed by both visual observation and bodily sensation of being tightened with an appropriate axial force, double confirmation can be performed and safety can be further improved. it can.

Since the nut is divided into the first nut body 11 and the second nut body 12, and the washer assembly 13 is interposed between the first nut body 11 and the second nut body 12, a conventional single nut Compared to the structure, the bolt is several ten mm longer, but the bolts and wheels are not affected otherwise.
The present invention can be used not only as a hub nut of a wheel but also as a bolt and nut of a structure requiring torque management. Also, the axial force management washer 14 of the present invention can be easily formed by press-forming the plate and then heat-treating it to impart spring properties, or by press-molding spring steel, and the remaining parts are ordinary nuts. It can manufacture by the method according to manufacture.

It is sectional drawing of the nut with an axial force management washer of this invention. It is a top view of the nut with an axial force management washer of FIG. It is sectional drawing of an axial force management washer among the nuts with an axial force management washer of this invention. It is sectional drawing of an axial force management washer stand among the nuts with the axial force management washer of this invention. It is sectional drawing of the hub bolt and nut of the general structure of the former (it can apply also to this invention except the part of a nut). It is sectional drawing of the wheel (disc wheel) of the conventional general structure (it can apply also to this invention). It is sectional drawing of the nut vicinity in case the conventional product is a straight hole.

Explanation of symbols

1 Wheel 2 Hub 3 Hub Bolt (Bolt)
4 Conventional hub nut (nut)
5 Nut bearing surface 10 Nut with axial force management washer 11 First nut body 12 Second nut body 13 Washer plate 14 Axial force management washer 15 Axial force management washer cradle 16 Confirmation plate 17 Protection plate 18 Parts set ring 18a, 18b Hook 19 groove

Claims (4)

A first nut body; a second nut body that is rotatable relative to the first nut body and is movable in an axial direction;
A washer assembly interposed between the first nut body and the second nut body and having an elastically deformable axial force management washer and an axial force management washer cradle for receiving the axial force management washer;
Nut with axial force management washer equipped with.   A confirmation plate for confirming an elastic deformation amount of the axial force management washer is interposed between the first nut body and the washer assembly, and between the second nut body and the washer assembly. The nut with an axial force management washer according to claim 1, wherein a protective plate is interposed in the nut.   The nut with an axial force management washer has a component set ring extending between the first nut body and the second nut body, and the second nut body includes the second nut body. The nut with an axial force management washer according to claim 1 or 2, wherein a groove for releasing a relative displacement between said part set ring and said part set ring is formed.   The nut with an axial force management washer according to any one of claims 1 to 3, wherein the nut with an axial force management washer is a hub nut of an automobile wheel.

Images