JPH068334Y2 - Tightening member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a fastening member, and more specifically, it is screwed into a stud bolt protruding from a body panel of an automobile or the like to attach automobile parts or the like to the body panel in a tightened state. For a tightening member for.

(Prior Art) As such a conventional tightening member, there is a tightening member 1 made of synthetic resin shown in FIGS. 5 and 6.

This tightening member 1 is configured such that a bag-shaped nut portion 2 is screwed into a stud bolt 3 in an externally inserted state, and a flange 4 provided in an opening portion of the nut portion 2 is used to tighten automobile parts and the like. .

(Problems to be solved by the invention) However, such a fastening member 1 is attached to the body panel 5 as a countermeasure against flying stones for automobile parts such as automobile lockers made of a material having insufficient heat resistance. When it is used for the side stone guard 6 made of polyethylene or polyethylene, there are the following problems.

That is, when the tightening member 1 is screwed into the stud bolt 3 and tightened, strong friction occurs between the rotating flange 4 and the side stone guard 6, and high friction heat is generated.
Since the side stone guard 6 made of the above material has low heat resistance, the portion around the mounting hole 7 is softened by frictional heat and is damaged by the tightening force of the tightening member 1, or is further melted by heat to tighten the tightening member. There was a case where it was welded to No. 1. If such a situation occurs, there is a problem that the side stone guard 6 is rattled or that the removal or replacement thereof is hindered.

In order to cope with such a problem, it is conceivable to interpose another thin plate member that does not transmit the rotational movement of the flange 4 between the tightening member 1 and the side stone guard 6.

However, in this case, an increase in the number of parts leads to troublesome management and an increase in the number of mounting steps, and the workability is deteriorated.

Next, the side stone guard 6 is provided with tightening portions at several places, and a large number of bodies to which the side stone guard 6 should be attached are sequentially conveyed on the assembly line. Therefore, there is a demand for efficiently and promptly screwing the fastening member into the stud balts using an impact wrench or the like.

However, with the tightening member 1 described above, it is inevitable to operate the impact wrench while gripping each one by the operator's hand and applying it to the stud bolt 3, so that the continuous operation of the impact wrench is effective. The work is difficult, and it has not been possible to sufficiently meet the above-mentioned demand for improvement in workability.

Therefore, in the present invention, when a mounting member such as an automobile part is mounted on a body panel by using a tightening member that is screwed into a stud bolt, the friction between the tightening member and the mounting member is effectively increased without increasing the number of parts. It is a problem to be solved to prevent such a problem and to enable the screwing operation of a large number of tightening members to be performed efficiently.

Another object of the present invention is to provide a tightening member which can be temporarily fixed to a stud bolt and which can prevent damage and welding of the washer part and can be satisfactorily tightened and fixed.

(Means for Solving the Problem) Means for solving the above-mentioned problem is a tightening made of a synthetic resin for screwing a stud bolt protruding from a body panel of an automobile or the like to attach a mounting part for an automobile or the like to the body panel. The nut is provided through a nut portion having a round hole capable of being screwed into a stud bolt and having a fastening flange on the outer periphery, and a joint portion that can be cut by an external force acting on the nut portion in the screwing direction. A ring-shaped washer portion connected so as to be located substantially coaxially with the portion, and an annular fitting portion having an inner diameter which is fitted into the washer portion and allows the stud bolt to be inserted therethrough on the lower side of the flange. By providing a locking claw for temporary fixing which can be flexibly deformed and which can be locked in the thread groove of the stud bolt, is provided on the inner peripheral portion of the fitting portion. That.

In the above means, the nut portion includes a tubular nut and a so-called cap nut nut, and a nut having a female screw in advance, a tapping screw type stud bolt having a smooth inner peripheral portion, or an inner nut. The peripheral portion may be formed in a spline shape.

The connecting portion may be of a type that is cut by an axial tightening force when an external force is applied to the nut portion in the screwing direction or a type that is cut by a circumferential rotating force. The number of connecting portions does not matter.

The washer portion may have any annular structure, and may be formed into, for example, a rectangular annular body, a flat ring shape, or a cylindrical shape.

The shape and number of the locking claws for temporary fixing are not limited.

Further, a projection for a stopper that resists rotation of the washer by engaging with a projection or a hole provided in a predetermined portion of the mounting part is formed in a part of the washer part facing the mounting part such as an automobile part. You can also do it.

(Operation) When the nut portion of the tightening member is screwed into the stud bolt, the joint portion is cut and the nut portion and the washer portion are separated. When tightening the mounting parts with the nut part, the fitting part of the nut part which is a separate body fits into the hole part of the washer part, so slippage occurs between the flange and the washer part, and the washer part hardly rotates. , The axial tightening force of the nut is applied to the mounting parts. In addition,
In the device according to claim (2), the rotation of the washer portion is completely restricted, and only the axial tightening force acts on the mounting component.

The nut part and the washer part are handled as an integral part until they are attached.

Further, since the tightening member can be temporarily fixed to the stud bolt by using the temporary fixing claw, the tightening member is temporarily fixed at each of the plurality of tightening portions set in the mounting parts, and the impact wrench can be operated continuously to efficiently and efficiently. The screwing work can be performed quickly.

(Embodiment) Next, a first embodiment of the present invention will be described with reference to FIGS.

The tightening member 8 made of synthetic resin has a nut portion 9 and a washer portion 1.
It has 0 and.

As shown in FIG. 2, the nut portion 9 has a tubular shape with the upper end closed, and the inner peripheral portion is a smooth round hole 11 for screwing a bolt formed in a predetermined inner diameter, and the outer peripheral portion is tightened. The flange 12 for the projection is projected and the flange 1
The upper portion of 2 is a square head portion 13, and the lower portion is a cylindrical fitting portion 14. The fitting portion 14 has an annular shape with an inner diameter that allows a stud bolt to be sufficiently inserted therethrough.

On the inner peripheral portion of the fitting portion 14, a pair of temporary locking claws 14a having a thickness capable of bending and deforming and projecting from the circumferentially opposed positions toward the center are provided. A hole 14b for die cutting at the time of molding is left around the portion where the locking claw 14a is provided.

Next, the washer portion 10 is an annular body having a shape in which an upper small-diameter ring portion 15 and a lower large-sized ring portion 16 are continuous via a step portion 17. The small-diameter ring portion 15 has an outer diameter substantially matching the flange 12 and an inner diameter slightly larger than the outer diameter of the fitting portion 14. Also, large ring 1
6 is a mounting hole 19 for a side stone guard 18 described later.
It has an inner diameter larger by a predetermined width.

The nut portion 9 and the washer portion 10 are positioned substantially coaxially with each other by an appropriate number of thin connecting portions 20 that connect the outer periphery of the lower end portion of the fitting portion 14 and the inner periphery of the upper end portion of the small diameter ring portion 15 in the shape direction. They are connected together.

The present embodiment is configured as described above, and the nut portion 9 and the washer portion 10 can be handled as an integrated product, which is convenient for transportation, delivery, or parts management.

The tightening member 8 is used as follows. That is, as shown in FIG. 2, first, the side stone guard 18 is brought into contact with the body panel 21 with the mounting hole 19 thereof fitted into the tapping screw type stud bolt 22 of the body panel 21. Then, the washer portion 10 side of the tightening member 8 is applied to the side stone guard 18 along the axial center of the stud bolt 22. At this time, the tip of the stud bolt 22 is fitted to the entrance portion of the round hole 11 of the nut portion 9, and the locking claw 14a is locked in the thread groove of the stud bolt 22, so that the tightening member 8 is moved to the position shown in FIG. It is temporarily fixed in the state shown.

Then, an external force is applied to the square head 13 in the screwing direction by an appropriate means such as an impact wrench. Then, the nut portion 9 is screwed in along the axial direction of the stud bolt 22. Since the washer portion 10 applied to the side stone guard 18 cannot move in that direction, the connecting portion 20 is cut by such a change in the relative position, and the nut portion 9 and the washer portion 10 are separated.

While the washer portion 10 is temporarily rotated together with the nut portion 9 until the connecting portion 20 is cut, friction is generated between the washer portion 10 and the side stone guard 18, but the friction is extremely short, and Since the friction is based on the small torque transmitted to the washer portion 10 via the portion 20, there is no problem.

When the nut portion 9 is screwed into the stud bolt 22 as it is, the fitting portion 14 is fitted into the inner peripheral portion of the washer portion 10 and the flange 12 is brought into contact with the upper end of the small diameter ring portion 15 as shown in FIG. Contact. From this point, the nut portion 9 is tightened with a large torque, but some slippage occurs between the flange 12 of the nut portion 9 and the small-diameter ring portion 15 of the washer portion 10, which are already separate bodies. The washer portion 10 does not rotate much, and the torque transmitted to the washer portion 10 is reduced. Therefore, while the side stone guard 18 is fixed to the body panel 21 by the tightening force through the washer portion 10, it does not cause strong friction with the washer portion 10 and is softened by high frictional heat to be broken or washer. Problems such as welding with the portion 10 are prevented.

An example for coping with a case where the heat resistance of the side stone guard is extremely poor or a case where slippage between the nut portion and the washer portion does not easily occur will be described later. The washer portion 10 also serves as a locking stopper for the nut portion 9.

In the above mounting process, the nut portion 9 and the washer portion 1
Since 0 and 0 can be handled as one body, the work is simpler and the number of mounting steps can be reduced as compared with a system in which separate washers and nuts are mounted.
Moreover, the temporary tightening of the tightening members 8 at the plurality of tightening portions set on the side stone guard 18 and the continuous operation of the impact wrench enable the screwing work of the plurality of tightening members 8 to be performed efficiently and quickly. . From the above points, workability is good.

Further, a second embodiment of the present invention will be described with reference to FIGS. 4 (a) to 4 (c).

In this embodiment, as shown in FIG. 4 (a), four stopper projections 33 are provided on the bottom surface of the step portion 32 between the small diameter ring portion 30 and the large diameter ring portion 31 of the washer portion 29, and As shown in FIG. 4 (b), four stopper projections 36 located corresponding to the projections 33 are also provided around the mounting hole 35 of the side stone guard 34.

The stopper projections 33 and 36 are provided on the washer portion 29.
Are formed so that their tops interfere with each other when they are brought into contact with the side stone guard 34. Therefore, the relative rotation of the washer portion 29 with respect to the side stone guard 34 is caused by the engagement of the protrusions 33 and 36. Completely prevented. Both protrusions 33 and 36 are 1
3 to 5 or 5 or more may be provided, and the numbers do not have to match each other. Also, these protrusions 33, 3
6 has a steep angle (for example, substantially vertical) on one side with respect to the rotation direction of the washer portion 29 and a gentle inclination on the other side to resist rotation of the washer portion 29 in the screwing direction of the nut portion, It is also possible to make little resistance to rotation in the opposite direction.

Furthermore, as shown in Fig. 4 (c), the side stone guard 3
7 has a proper number of holes 39 around the mounting hole 38, and the same number of stoppers are provided on the bottom surface of the step portion of the washer portion (not shown) depending on the height, shape and positional relationship that can be fitted into the hole 39. It is also possible to provide a projection for use and insert the projection into the hole 39 to prevent rotation of the washer portion.

The above embodiments shown in FIGS. 4 (a) to 4 (c) are particularly suitable for the following cases.

(A) When tightening the nut part, if there is a condition that slippage between the nut part and the washer part does not easily occur, for example, the frictional resistance between the nut part and the washer part is large, and the washer part and the side stone guard are If there is no difference compared to the frictional resistance between, or more.

(B) When you want to prevent the generation of slight frictional heat because the side stone guard is made of a material with particularly poor heat resistance.

Needless to say, each of the above-described embodiments can be used for mounting other types of mounting parts such as automobile parts made of a material having insufficient heat resistance, and in general, tightening a nut member through a washer member. Can be applied to general attachment of parts such as

(Effects of the Invention) The invention described in claim (1) uses the tightening member of the method of screwing into the stud bolt to mount the mounting parts such as automotive parts having insufficient heat resistance on the body panel of the car. It is possible to effectively prevent friction between the tightening member and the mounting component and prevent the generation of frictional heat, thereby avoiding problems such as damage to the mounting component and welding of the mounting member. Also, the nut part and the washer part are temporarily attached through the connecting part so that they can be handled integrally without increasing the number of parts.
Also, since the provisional locking claw for the stud bolt is provided, it is possible to perform a predetermined tightening and fixing after temporarily fixing the mounting component to the stud bolt, and the workability of mounting the mounting component is also good.

According to the invention described in claim (2), it is possible to almost completely prevent friction between the tightening member and the mounting component when tightening the nut portion, and frictional heat generated thereby.

In particular, according to the present invention, when the nut portion is tightened, the nut portion is tightened in a state in which the fitting portion of the nut portion separated from the washer portion is fitted into the hole portion of the washer portion, so that the friction in tightening the nut portion is reduced. This is performed on the lower surface of the flange portion and the upper surface of the washer portion, and is characterized in that frictional heat is not applied to the mounting component.

[Brief description of drawings]

FIG. 1 is a perspective view of the embodiment of FIG. 1 of the present invention, FIGS. 2 and 3 are mounting state views shown in the section AA of FIG. 1, and FIG.
FIGS. 4 (a) to 4 (c) are perspective views of essential parts for explaining the second embodiment,
FIG. 5 is a perspective view of a conventional example, and FIG. 6 is a sectional view showing its usage. 8 ... Tightening member 9 ... Nut part 10 ... Washer part 12 ... Flange 14a ... Locking claw 18 ... Sidestone guard 20 ... Connection part 21 ... Body panel 22 ... Stud bolt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Fujimoto 25-25 Enogicho, Suita City, Osaka Prefecture, Japan Osaka Sales Division, Japan Welding Co., Ltd. (56) References Japanese Patent Publication Sho 45-36690 (JP, B1) )

Claims (2)

[Scope of utility model registration request] 1. A fastening member made of a synthetic resin for screwing a stud bolt protruding from a body panel of an automobile or the like to attach a mounting component for an automobile or the like to a body panel, the round hole capable of being screwed into the stud bolt. A nut portion having an outer periphery and a tightening flange, and an annular portion connected so as to be positioned substantially coaxial with the nut portion via a joint portion that can be cut by an external force acting on the nut portion in a screwing direction. A washer portion is provided, and an annular fitting portion having an inner diameter that fits into the washer portion and allows the stud bolt to be inserted is provided on the lower side of the flange, and the stud bolt is provided on the inner peripheral portion of the fitting portion. The fastening member is characterized in that a locking deformable locking claw that can be locked in the thread groove of the projection is projected. 2. A projection for a stopper which engages with a projection or a hole provided in a predetermined portion of the mounting part at a portion of the washer part facing the mounting part for an automobile or the like and resists rotation of the washer part. The tightening member according to claim 1, wherein the tightening member is formed.