JPH10244869A - Part for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp whose depth can be increased by shortening length of a tapping screw in a stud pin protruded on the lamp back face. SOLUTION: In a lamp, in which a stuck pin 20 to be used for installing a body 12 to a vehicle body is protruded in a cylindrical boss 30 projectingly formed on the back face of the body 12 made of synthetic resin, the stud pin 20, which is provided with a tapping screw 22 screwed to a boss hole 31 so as to be buried, a plug 24 fitted to a fastener on the vehicle body side, and a flange arranged between the screw 22 and the plug 24, are molded integrally with synthetic resin, and the length of the screw 22 is set to be 4-7mm which is shorter than that of a conventional screw (12mm), so that the backward projection of the stud pin 20 can be reduced. On the other hand, the screw is provided with the outside diameter of 9-12mm which is larger than that of a conventional one (7mm), so that reduction in fastening breakage torque accompanying shortening of the screw 22 can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle component having a stud pin protruding from the rear surface, and more particularly to a vehicle component having a stud pin formed of a synthetic resin molded body.

[0002]

2. Description of the Related Art FIGS. 8 and 9 show a clearance lamp mounted on a corner portion of a vehicle, which is an example of a prior art of such a vehicle component. The lamp 1 is integrated with a lamp body 2 in which a bulb 4 is inserted into a bulb insertion hole 3 and a front lens 5 is assembled.
At the corners of the vehicle body 8, since deep drawing is difficult, the lamp housing space 8 a near the vehicle body side is very shallow. On the vehicle body side turning side 1 a of the lamp 1, sacrificing appearance, as the lamp fits in a shallow lamp accommodating space 8a, the depth L ₁ between the lamp body 2 and the front lens 5 is smaller.

[0003] A bracket 2a is formed to protrude rearward at a rear upper portion of a substantially central portion in the left-right direction of the lamp body 2, and a stud pin 6 is protruded from a lower rear portion of the vehicle body turning side 1a. 6 is attached to the fastener 9 on the vehicle body 8 side, and the bracket 2a is
By fastening the nut, the lamp 1 is attached to the vehicle body 8.

As shown in an enlarged view in FIG. 10, a stud pin 6 is screwed into a hole 7a of a boss 7 protrudingly formed in the lamp body 2 and is embedded and fixed at a rear end side; A plug 6b on the front end side that can be fitted to the fastener 9 provided at the front end, and a flange 6c for setting the buried length provided between the tapping screw 6a and the plug 6b, in consideration of weight reduction and ease of manufacture. And is formed of a synthetic resin integrally molded body.

The tapping screw 6a of the conventional stud pin 6 shown in FIG. 10 has a length of 12 millimeters, an outer diameter of 7 millimeters, a thread angle of 60 degrees, and a thread pitch of 1 millimeter. The radius R at the top of the thread is 0.1 mm and the radius R at the root is 0.2 mm.

[0006]

As described above, the conventional lamp has a poor appearance because the depth on the vehicle body side turning side 1a cannot be made large, but the inventors examined this point. It has been found that the stud pins 6 protrude greatly behind the rear surface of the lamp body 2, which is _one of the reasons why the depth L1 on the side 1a of the lamp on the vehicle body side cannot be increased.

[0007] In vehicle parts other than lamps, such as garnishes, the protruding length of the stud pins protruding rearward from the back of the part is also a factor that limits the front-rear thickness and front-rear width of the vehicle parts. Had become.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to reduce the length of a tapping screw of a stud pin protruding from a rear surface of a vehicle component main body. It is an object of the present invention to provide a vehicle component capable of increasing the depth and thickness of a component body.

[0009]

According to a first aspect of the present invention, there is provided a vehicle component having a cylindrical boss formed on a rear surface of a synthetic resin vehicle component body. In a vehicle component provided with a stud pin for attaching a vehicle component body to a vehicle body, a stud pin is screwed into a boss hole, and a rear end tapping screw that is embedded and fixed, and provided on the vehicle body side. A front-end plug that can be fitted to the fastener, and a molded body of synthetic resin having a tapping screw and a flange for setting an embedded length provided between the plug and the tapping screw. 4 to 7 mm, the outer diameter of which is 9 to 12 mm, the length of the tapping screw is a conventional tapping screw Short min compared 12 millimeters) in length, protruding height of the boss can also be shortened, the amount of projection of the stud pin projecting from the rear of the component body vehicle becomes shorter than conventional. In addition, as the length of the tapping screw is shortened, the tightening breaking torque (the ultimate torque at which the boss hole side where the tapping screw is screwed to break) decreases, but the outer diameter of the tapping screw is reduced by the conventional tapping screw. By making the diameter larger than (outer diameter 7 mm) (9 to 12 mm), a decrease in tightening breaking torque can be suppressed, and a large tightening torque can be secured at the screw portion between the tapping screw and the boss. In the second aspect, the angle of the thread of the tapping screw is set to 30 to 45 degrees, which is smaller than the conventional angle (60 degrees). The angle of the tapping screw thread is
It is proportional to the screwing torque of the screw and proportional to the shear fracture strength of the thread. Therefore, in order to reduce the screwing torque of the tapping screw, the angle of the thread of the tapping screw is set to 45 degrees or less. In addition, by increasing the outer diameter of the tapping screw, a decrease in the shear fracture strength of the thread is suppressed, and the angle of the thread is set to 30 degrees or more in order to secure an appropriate shear strength of the thread. I made it. In claim 3, R of the valley of the tapping screw is conventionally (0.2 mm).
The radius is larger than 0.3 to 0.4 mm. R of tapping screw valley
Is proportional to the shear fracture strength of the thread, so that the decrease in the shear fracture strength of the thread caused by reducing the angle of the thread compared to the conventional method is compensated for by increasing the R of the valley compared to the conventional method. ing. If the radius R of the valley is 0.3 mm or less, an appropriate shear fracture strength cannot be obtained, and if the radius R of the valley is 0.4 mm or more, a predetermined thread height cannot be formed. Therefore, the radius R of the valley of the tapping screw is set to a radius of 0.3 to 0.4 mm so that an appropriate shear strength can be obtained for a screw thread having an appropriate height. According to a fourth aspect of the present invention, the radius R of the top of the thread of the tapping screw is set to a radius of 0.1 to 0.15 mm which is larger than the conventional one (0.1 mm). R at the top of the thread of the tapping screw is
It is inversely proportional to the screwing torque and inversely proportional to the shear fracture strength at the top of the thread. If the radius R at the top of the thread is 0.15 mm or more, the screwing resistance is too large, and it is difficult to smoothly screw the tapping screw into the boss hole. When the radius is 0.1 mm or less, the shear strength at the top of the thread is too low, and the shear strength at the top of the thread is low. Therefore, the radius R at the top of the thread of the tapping screw can reduce the screwing resistance and can secure the shear strength of the thread of 0.1 mm.
０．１0.15 mm. In claim 5,
The contact surface between the tapping screw and the flange of the boss into which the tapping screw is screwed is configured as a tapered surface whose height becomes lower toward the inner side in the radial direction, and when the flange abuts on the boss, the flange peripheral edge portion. The structure is such that it gradually comes into close contact with the contact surface on the boss side and is pressed against the boss, thereby increasing the tightening fracture torque. That is, by making the contact surface of the boss with the flange a tapered surface whose height is lower toward the inside in the radial direction, when the tapping screw is screwed into the boss hole and the flange abuts on the boss, from the flange peripheral portion. The entire flange is pressed against the contact surface on the boss side gradually, and the flange acts like a spring washer. it can. The flange also acts as a cushioning member that reduces the load transmitted to the threaded portion between the tapping screw and the boss against a vertical load acting on the stud pin.

[0010]

Next, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 to 7 show a clearance lamp according to a first embodiment of the present invention. FIG. 1 is a plan view in which a part of a clearance lamp attached to a vehicle corner is cut away, and FIG. FIG. 3 is an enlarged side view of a stud pin, FIG. 4 is an enlarged sectional view of a boss to which a stud pin is screwed, and FIG. 5 is a diagram illustrating a state in which a tapping screw is screwed into a boss hole. FIG. 6 is a cross-sectional view of a mold for forming a stud pin, and FIG. 7 is a cross-sectional view for explaining how a flange is pressed against a flat flange contact surface.

In these figures, a clearance lamp 10 is integrated as a lamp with a front lens 15 attached to a lamp body 12 in which a bulb 14 is inserted into a bulb insertion hole 13. At the corners of the vehicle body 8, since deep drawing is difficult, the lamp housing space 8 a near the vehicle body side is very shallow, and the lamp housing space 8 a on the vehicle body side turning side 10 a of the lamp 10 as it will fit depth L ₂ between the lamp body 2 and the front lens 5 is formed smaller than the depth L ₃ of the valve 13 the peripheral region.

A bracket 2a is formed to protrude rearward from an upper rear portion of a substantially central portion in the left-right direction of the lamp body 12, and a stud pin 20 is protrudingly provided from a lower rear portion of the lamp body 12 that extends around the vehicle body. The stud pin 20 is fitted to the fastener 9 on the vehicle body 8 side, and the bracket 2a is
By fastening bolts and nuts to the
It can be attached to.

2 and 3, the stud pin 20 is screwed into a boss hole 31 and fixed to a rear end side tapping screw 22 and a fastener 9 provided on the vehicle body 8 side. A synthetic resin (((a) is provided with a plug 24 at the front end on which a substantially spindle-shaped bulged portion 24a that can be fitted is formed, and a hexagonal flange 26 provided between the tapping screw 22 and the plug 24 for setting an embedded length. It is composed of an integrally molded product of Mitsubishi Gas Chemical Co., Ltd. (trade name: RENY).

The plug 24 has a structure in which a swelling portion 24c is formed at the tip of a straight base portion 24a via a constricted portion 24b, and the swelling portion is formed on a fastener 9 inserted into a fastener insertion hole 8b of the vehicle body 8. When 24c is inserted, the constricted portion 24
b is engaged with the reduced diameter portion of the fastener 9 and is prevented from falling out,
It is fixed and held without rattling. The length H ₁ to constriction 24b from the flange 26 of the plug 24 is the same as the length h ₁ to constriction of conventional flanges 6c of the plug 6.

The hexagonal flange 26 functions to set the amount of the tapping screw 22 to be embedded in the boss hole 31 and to set the amount of projection of the stud pin 20 protruding above the boss 30. There is also a function as an engaging portion of a spanner or a wrench when screwing into the hole 31.

The tapping screw 22 has a length of 4 to 7 mm and an outer diameter of 9 to 12 mm, and has a length (12 mm) of a tapping screw 6 a of a conventional stud pin (see FIG. 10). Is 5 to 8 millimeters shorter. further,
Boss 30 protruding from the back of lamp body 12
Of the tapping screw 22 and the depth of the boss hole 31 correspond to the length of the tapping screw 22.
Therefore, the total protruding amount H of the stud pin 20 from the rear surface of the lamp body 12 is also slightly longer than that of the lamp body 12.
As compared with the conventional lamp, the length of the tapping screw 22 and the boss 30 is shorter, that is, about 5 to 8 mm.

[0018] Therefore, in the present embodiment, the partial depth of the body side curved portion 10a of the lamp (distance between the lamp body 12 and the front lens 15) L ₂ is the amount of projection of the stud pin 20 is short ( 5-8 mm), which is larger than the depth L ₁ (see FIG. 9) of the conventional lamp on the vehicle body side wraparound side 1a (see FIG. 9), so that the appearance of this lamp on the vehicle body side wraparound side 10a is improved. It has become.

If the length of the tapping screw 22 is short, the tightening and breaking torque decreases, and the strength of the threaded portion between the tapping screw 22 and the boss hole 31 also decreases. In the embodiment, the outer diameter of the tapping screw 22 is formed to be larger than the outer diameter (7 millimeters) of the conventional tapping screw, so that a tightening rupture torque (30 kgf · cm) equal to or higher than the conventional one can be obtained. I have.

The angle of the thread 22a of the tapping screw 22 is set to 30 to 45 degrees, which is smaller than the conventional angle of 60 degrees, in order to reduce the screwing resistance. In other words, when the angle of the thread is reduced, the screwing resistance is reduced, and the tapping screw can be smoothly screwed into the boss. It is formed at 30 to 45 degrees which can satisfy both of the securing of the shear strength.

Further, since the radius R of the root of the tapping screw 22 is proportional to the shear fracture strength of the thread 22b, the angle of the thread is smaller than that of the conventional one (60 degrees) (30 to 45 degrees).
) Is compensated by increasing the R of the valley portion 22b from the conventional value (0.2 mm). If the radius R of the valley portion 22b is 0.3 mm or less in radius, an appropriate shear fracture strength cannot be obtained, and if the radius R of the valley portion is 0.4 mm or more, a predetermined thread height cannot be formed. Therefore, the radius R of the valley portion 22b of the tapping screw 22 is set to a radius of 0.3 to 0.5 mm at which an appropriate shear strength can be obtained for a thread having an appropriate height.
4 mm.

The radius R at the top of the thread 22a of the tapping screw 22 is set to a radius of 0.1 to 0.15 mm, which is larger than the conventional one (0.1 mm).

Thread 22a of tapping screw 22
Is inversely proportional to the screwing torque, and
a is inversely proportional to the shear fracture strength. And the screw thread 22a
When the radius R of the top is 0.15 mm or more, the screwing resistance is too large, and it is difficult to smoothly screw the tapping screw into the boss hole. When the radius is 0.1 mm or less, the shear strength at the top of the thread 22a is too low, and the shear strength at the top of the thread 22a is low. Therefore, the tapping screw thread 22a
The radius R of the top portion of the screw can reduce the screwing resistance and can secure the shear strength of the screw thread 22a.
5 mm.

As shown in FIGS. 4 and 5, the contact surface 32 of the boss 30 with the flange 26 (the protruding end surface of the boss 30) has a tapered surface (taper angle θ) whose height becomes lower toward the inner side in the radial direction. ₁₎ is formed, when fixing by screwing the tapping screw 22 to the boss hole 31, gradually close contact abuts the boss 30 from the periphery 26b ₁ of the flange 26 toward the base portion 26b _2, the tapping screw 22 A large tightening torque can be obtained at the threaded portion between the screw and the boss 30.

That is, as shown in FIG. 6, the stud pin 20 includes a first mold 41 for molding one side surface of the stud pin 20 and a second mold 42 for molding the other side surface.
It is molded by a pair of opposite molds consisting of
The flange forming surfaces 41a and 42a of the dies 41 and 42 have
A draft is provided to facilitate removal of the molded article from the mold. For this reason, the stud pin 2
0 on the upper surface 26a and the lower surface 26b of the flange 26,
An inclination θ ₂ (see FIG. 3) corresponding to the draft angle on the molding die side is provided.

As shown in FIG. 7, when the contact surface 32 of the boss 30 with the flange 26 is a flat surface, the tapping screw 22 is screwed into the boss hole 31 and the root 26b _{2 of the} flange 26 becomes the boss 30. Abut. And even if the tapping screw 22 is further screwed in,
Only the flange root portion 26b ₂ is a form of being pressed against the contact surface 32 of the boss side, the smaller the breaking tightening torque in screwing portion between the tapping screws 26 and the boss 30, between the self-tapping screws 26 and the boss 30 The tightening torque that can be applied to the threaded portion is also reduced.

However, in this embodiment, the contact surface 32 of the boss 30 with the flange 26 is a tapered surface having a lower height as it goes inward in the radial direction, and the taper angle θ ₁ is larger than the inclination θ _{2 of the} flange 26. Is formed. Therefore, when the tapping screw 22 is screwed into the boss hole 31 and fixed, the tapping screw 22 is screwed into the base 26 from the lower peripheral edge 26 b ₁ of the flange 26.
gradually abutting contact toward b ₂ so that the whole lower flange surface 26b is pressed against the contact surface 32. Since the flange 26 has a function as a spring washer, the tapping screw 22 and the boss 3
The tightening breaking torque at the threaded portion between 0 becomes large,
A large tightening torque can be applied to a threaded portion between the tapping screw 22 and the boss 30. Further, the flange 26 is provided with a vertical load P acting on the stud pin 20.
2 (see FIG. 2), it also acts as a buffer member for reducing the load transmitted to the screwing portion between the tapping screw 22 and the boss 30.

Therefore, the stud pin 2 in this embodiment is
It can be said that the mounting strength of No. 0 is high and the durability is excellent.
In the above-described embodiment, the flange 26 of the stud pin 20 has a slope corresponding to the draft of the mold. However, even when the flange 26 is not sloped, the contact surface 32 on the boss side is tapered. Is attached,
Since the flange 26 acts as a spring washer, a large tightening torque can be applied to the threaded portion between the tapping screw 22 and the boss 30, and the load transmitted to the threaded portion is reduced by the flange. This is not different from the above embodiment.

Further, in the above-described embodiment, the clearance lamp having the stud pin projecting from the rear surface has been described. However, the present invention is not limited to the clearance lamp, but can be widely applied to other vehicle lamps.

Furthermore, the present invention is not limited to vehicle lamps, but can be widely applied to vehicle decorative articles such as garnishes having stud pins protruding from the back.

[0031]

As is apparent from the above description, according to the vehicle component according to the present invention, the stud pin protrudes from the rear surface of the vehicle component body so short that the depth and front and rear of the vehicle component are reduced accordingly. It can be correctly accommodated in a predetermined accommodation space in a form in which the thickness is enlarged and the appearance is improved. In particular, when the present invention is applied to a lamp having a vehicle body side turning part having almost no depth, the depth in the vehicle body side turning part of the lamp may be increased by the amount that the stud pin protruding length may be short. So, to enhance the appearance of the lamp,
As a result, the appearance of the entire vehicle can be improved.
In addition, by increasing the outer diameter of the tapping screw, since there is no decrease in the tightening breaking torque due to the shortening of the length of the tapping screw, a large tightening torque can be applied between the tapping screw and the boss, The mounting strength of the stud pin is not inferior to the conventional one. According to the second, third and fourth aspects, the stud pin can be smoothly screwed into the boss hole, and the shear strength of the thread does not decrease. According to the fifth aspect, by applying a large tightening torque to the threaded portion between the stud pin and the boss, the stud pin is firmly attached and fixed to the boss, and the fixed holding of the lamp to the vehicle body is guaranteed for a long time. .

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view of a clearance lamp according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a lamp body at a stud pin projecting position.

FIG. 3 is an enlarged side view of a stud pin.

FIG. 4 is an enlarged sectional view of a boss to which a stud pin is screwed.

FIG. 5 is a cross-sectional view illustrating a state in which a tapping screw is screwed into a boss hole.

FIG. 6 is a sectional view of a mold for forming a stud pin.

FIG. 7 is a cross-sectional view illustrating a state in which the flange is pressed against a flat flange contact surface.

FIG. 8 is a rear perspective view of a conventional clearance lamp.

FIG. 9 is a horizontal sectional view of the lamp.

FIG. 10 is a longitudinal sectional view of the lamp body at a stud pin projecting position.

[Explanation of symbols]

Reference Signs List 8 vehicle body 9 fastener 10 clearance lamp as vehicle part 12 lamp body as vehicle body 14 bulb 15 front lens 20 stud pin 22 tapping screw 22a tapping screw thread 22b tapping screw valley 24 plug 26 flange 26a flange Upper surface 26b Flange lower surface 26b ₁ Flange lower surface peripheral edge 26b ₂ Flange lower surface root portion 30 Boss 31 Boss hole 32 Boss flange contact surface

Claims (5)

[Claims] 1. A vehicle component comprising a synthetic resin-made vehicle component main body and a cylindrical boss protrudingly formed on a rear surface of the synthetic resin vehicle component main body and a stud pin for attaching the vehicle component main body to a vehicle body. The stud pin is a rear end tapping screw that is embedded and fixed by being screwed into the boss hole, a front end plug that can be fitted to a fastener provided on the vehicle body side, and an embedding provided between the tapping screw and the plug. A tapping screw having a length of 4 to 7 millimeters and an outer diameter of 9 to 12 millimeters. Vehicle parts. 2. The vehicle component according to claim 1, wherein an angle of a thread of the tapping screw is 30 to 45 degrees. 3. The vehicle component according to claim 1, wherein a radius R of a valley of the tapping screw has a radius of 0.3 to 0.4 mm. 4. The vehicle component according to any one of claims 1 to 3, wherein a radius of a top of a thread of the tapping screw is 0.1 to 0.15 mm. 5. The vehicle component according to claim 1, wherein a contact surface of the boss with the flange is formed as a tapered surface whose height becomes lower toward the inside in the radial direction.