JPH10184645A - Insert nut embedding structure in synthetic resin parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent another part from being damaged by an insert nut and fasten another part stably in case of fastening another part by the insert nut embedded in a synthetic resin part. SOLUTION: In this insert nut embedding structure in synthetic resin parts, an insert nut 54 is embedded in a synthetic resin part 5 so as to be able to fasten another part. In this case, an external exposed face 54a of the insert nut 54 is recessed from an insert nut embedding face 53a of the synthetic resin part 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure for burying an insert nut in a synthetic resin part.

[0002]

2. Description of the Related Art In some vehicles such as motorcycles, the fuel tank is made of a synthetic resin and is integrally molded so that the shape of the tank is liberalized, the capacity is increased, and manufacturing is facilitated. To provide a detachable or openable cap on such a synthetic resin fuel tank, a plurality of metal insert nuts 103 are embedded around an opening 102 of the fuel tank 101 as shown in FIG. A metal base 104 is fastened to these insert nuts 103 with bolts 105, and a cap (not shown) is fixed to the base 104 (see Japanese Utility Model Laid-Open No. 1-85195). It should be noted that a ring-shaped gasket 106 is interposed between the fuel tank 101 and the base 104 to prevent fuel leakage.

[0003]

As shown in FIG. 8, the externally exposed surface 107 of the insert nut 103 is 0.5 ° away from the insert nut buried surface 108 of the fuel tank 101.
It tends to protrude by about 1.0 mm. This is because the synthetic resin material cures and contracts after the fuel tank 101 is molded.

As described above, when the outer exposed surface 107 of the insert nut 103 protrudes from the insert nut embedding surface 108, as shown in FIG.
6 is located on the inner peripheral side of the bolt 105, it is good. For example, a structure in which the gasket 106 is a wide band and is sandwiched between the base 104 and the insert nut 103 (a band-like structure). In a structure in which the bolt 105 penetrates the gasket 106), the gasket 106 bites into the protruding insert nut 103 to significantly deteriorate the sealing performance. In the worst case, the gasket 106 may be broken.

In addition to the gasket 106, even when another synthetic resin part is fastened to the insert nut 103, for example, the soft other part is not
There is a risk of damage from contact with 103. Further, since the amount of protrusion of each insert nut 103 is not uniform, it is difficult to stably fasten the base 104 to all the insert nuts 103 in the example of FIG.

The present invention has been made to solve such a problem, and when another part is fastened to an insert nut embedded in a synthetic resin part, the other part is damaged by the insert nut. It is an object of the present invention to provide an insert nut burying structure in a synthetic resin component that can prevent the above problem and stably connect other components.

[0007]

In order to achieve the above object, an insert nut embedding structure in a synthetic resin part according to the present invention is a synthetic resin in which an insert nut is embedded in a synthetic resin part so that other parts can be fastened. In the structure for burying an insert nut in a component, the outer exposed surface of the insert nut is depressed with respect to the surface of the synthetic resin component in which the insert nut is buried.

[0008] As described above, if the outer exposed surface of the insert nut is depressed below the surface of the synthetic resin part where the insert nut is embedded, the insert nut does not bite into other parts fastened to the synthetic resin part. Parts are prevented from being damaged. In addition, since the other component completely adheres to the surface of the synthetic resin component where the insert nut is embedded, the other component can be stably fastened.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a left side view showing an example of a motorcycle in which an insert nut embedding structure according to the present invention is applied to a fuel tank, and FIG. 2 is an enlarged left side view of the vicinity of a front portion thereof.

The motorcycle 1 includes, for example, a body frame 2 of a semi-double cradle type (see FIG. 2), and power devices such as an engine 3 and a carburetor 4 are mounted in a front half thereof. A fuel tank 5 is provided above the engine 3, and a seat 6 is provided so as to be connected to a rear portion of the fuel tank 5.

On the other hand, a front fork 7 is rotatably supported on a head pipe 2a located at the front head of the vehicle body frame 2, and a front wheel 8 is supported at the tip of the front fork 7. The handlebar 9 is provided on the upper part of the vehicle. A swing arm 12 is supported by a pivot shaft 11 erected at the center lower portion of the body frame 2 so as to be able to swing up and down. A rear wheel 13 is supported at the rear end. The power is transmitted to the rear wheel 13.

A frame cover 16 made of a synthetic resin is provided to cover each part of the vehicle body. This frame cover
A front cowl 18 is located in front of the handlebar 9 and is provided with a headlight 17 and the like.
A pair of left and right tank side covers 19 connected to 18 and covering the side surface of the fuel tank 5, a tank upper cover 20 covering the upper part of the fuel tank 5, and a left and right part connected to the lower part of the tank side cover 19 and covering the upper side surface of the engine 3. The vehicle includes a pair of engine side covers 21, a pair of left and right seat side covers 22 that cover the lower portion of the seat 6, a tail cover 23 connected to a rear portion of the seat 6, and the like.

FIG. 3 is a left side view of the fuel tank 5, and FIG. 4 is a plan view of the fuel tank 5. Also, FIG.
FIG. 6 is an enlarged sectional view taken along line VV, and FIG. 6 is an enlarged view of a portion VI in FIG.

The fuel tank 5 is integrally formed of a synthetic resin material such as PE, and has a substantially inverted U-shaped vertical cross-sectional view so as to straddle a main pipe 2b located at the front head of the vehicle body frame 2 from above. have. And the fuel tank 5
Is floating (vibration-proof) with respect to the vehicle body frame 2 through a front fixing bracket 27, side fixing brackets 28L, 28R, and a rear fixing bracket 29 formed by pressing a rigid material such as a steel plate. Fixed.

As shown in FIGS. 2 to 4, the front fixing bracket 27 is disposed at the front of the fuel tank 5 and above the inverted U-shaped section 5a.
The front fixing bracket 27 is bolted to the fixing bracket 2c (see FIG. 2) provided immediately after the head pipe 2a of the vehicle body frame 2 with cushion rubbers 34, 35. And is fixed floatingly via a spacer 36.

The side fixing brackets 28L and 28R are disposed below the front portion of the fuel tank 5 and on both sides of the inverted U-shaped cross section 5a, and are respectively attached to the insert nut 39 of the fuel tank 5 by two bolts 38. Then, these side fixing brackets 28L and 28R are floatingly fixed to fixing brackets 2d provided on the front left and right side surfaces of the body frame 2 with bolts (not shown).

Further, the rear fixing bracket 29 is disposed below the rear portion of the fuel tank 5 and is attached to an insert nut 45 (see FIG. 4) embedded in the lower surface of the rear portion of the fuel tank 5 by four bolts (not shown). The rear fixing bracket 29 is fixed to the fixing bracket 2e (see FIG. 2) provided above the middle portion of the body frame 2 by two bolts 46 via a cushion rubber 47 and a spacer 48 in a floating manner. .

A fuel filler port 50 is provided in an upper part of the fuel tank 5. As shown in FIG. 4, FIG. 5 and FIG. 6 in an enlarged manner, the fuel supply port 50 has a circular base fixing surface 50a one step lower than the upper surface of the fuel tank 5, and an opening 52 is provided at the center thereof. Have been. An annular shallow gasket groove 53 surrounding the opening 52 is formed in the base fixing surface 50a, and several insert nuts 54 are embedded along the gasket groove 53.

An annular and band-shaped gasket 55 made of chemical-resistant rubber or the like is fitted in the gasket groove 53, and a metal base 56 is placed on the gasket 55 from above. To insert nut 54. Base 56
The cylindrical member 59 is fixed to a central hole of a plate member 58 press-formed in a plate shape. Each bolt 57 is fastened to the insert nut 54 by passing through the gasket 55.

As shown in FIG. 5, an embedded type (called an aircraft type) tank cap 60 is fixed to the base portion 56 with several bolts 61. The tank cap 60 has a cap body 63 attached to an annular cap base 62 so as to be openable and closable. When the cap body 63 is closed, the lock lever 64 of the cap body 63 engages with the lower end of the cylindrical member 59 of the base 56. Then, the cap body 63 is locked. The cap body 63 is provided with a key cylinder 65. By inserting and twisting a specific key into the key cylinder 65, the engagement of the lock lever 64 can be released and the cap body 63 can be opened. 66 is a lid of the key cylinder 65.

As shown in FIG. 6, the insert nut 54 embedded in the fuel supply port 50 (gasket groove 53) of the fuel tank 5 has an externally exposed surface 54a having an insert nut embedded surface of the fuel tank 5, that is, In this case, the gasket groove 53 is embedded so as to be depressed by about 0.5 to 1.0 mm with respect to the bottom surface 53a.

By doing so, the insert nut 54 does not bite into the gasket 55 of the base portion 56 fastened to the insert nut 54, and the gasket 55 is prevented from being damaged by the insert nut 54. Moreover, since the gasket 55 is completely in close contact with the bottom surface 53a of the gasket groove 53 over the entire circumference, the sealing performance of the gasket 55 can be significantly improved.

The base portion without the gasket 55
Even in the case where 56 is directly fastened to the base fixing surface 50a, if the externally exposed surface 54a of the insert nut 54 is depressed with respect to the base fixing surface 50a, the base 56 is completely adhered to the base fixing surface 50a. Thus, the base portion 56 can be stably fastened.

Further, not only the insert nut 54 for fastening the base portion 56 but also an insert nut for fastening other parts, for example, the fixing brackets 27 and 28 on the fuel tank 5 are provided.
Insert nuts 32, 3 for fastening L, 28R, 29
A similar buried structure may be applied to the fuel nuts 9 and 45 and the insert nut 70 for fastening the fuel gauge 68 and the fuel cock 69 to the bottom surface of the fuel tank 5. Further, the insert nut burying structure is not limited to the fuel tank of a motorcycle, and can be applied to all insert nut buried portions of other vehicles, ships, structures, and the like.

[0025]

As described above, the insert nut embedding structure in the synthetic resin part according to the present invention is a method for embedding an insert nut in a synthetic resin part in which an insert nut is embedded in a synthetic resin part so that other parts can be fastened. In the structure, since the outer exposed surface of the insert nut is depressed with respect to the surface of the insert nut embedded in the synthetic resin part, the insert nut is prevented from biting into other parts fastened to the synthetic resin part, and other parts by the insert nut are prevented. Parts can be prevented from being damaged. In addition, since the other component completely adheres to the surface of the synthetic resin component where the insert nut is embedded, the other component can be stably fastened.

[Brief description of the drawings]

FIG. 1 is a left side view showing an example of a motorcycle in which an insert nut burying structure according to the present invention is applied to a fuel tank.

FIG. 2 is an enlarged left side view of the vicinity of a front portion of the motorcycle.

FIG. 3 is a left side view of the fuel tank.

FIG. 4 is a plan view of a fuel tank.

FIG. 5 is an enlarged sectional view taken along line VV of FIG. 4;

FIG. 6 is an enlarged view of a portion VI in FIG. 3 showing an embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a base mounting portion in a synthetic resin fuel tank showing a conventional technique.

FIG. 8 is a longitudinal sectional view of an insert nut embedding portion showing a conventional technique.

[Explanation of symbols]

5 Fuel tank 50a as a synthetic resin part 50a Base fixing surface 53 Gasket groove 53a Bottom surface of gasket groove to be embedded nut insert surface 54 Insert nut 54a Externally exposed surface of insert nut 55 Gasket 56 Other parts to be fastened to synthetic resin parts Base part of

Claims (1)

[Claims] An insert nut embedded structure in a synthetic resin component in which an insert nut is embedded in a synthetic resin component so that other components can be fastened.
3. An insert nut embedding structure in a synthetic resin part, wherein the outer exposed surface 54a of the insert nut 54 is depressed with respect to the insert nut embedding surface (53a).