JP2537375Y2 - Fuel gauge unit mounting structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel gauge unit mounting structure for preventing a lock ring which is fastened to an insertion opening of a fuel tank from being loosened.

[0002]

2. Description of the Related Art A fuel tank of a vehicle is provided with an insertion port for mounting a fuel gauge unit. The lid of the fuel gauge unit is press-fitted to the insertion port via a seal packing to seal the insertion port.

In order to reliably prevent the fuel from leaking out of the insertion port, a resin lock ring is screwed into a screw portion formed on the outer periphery of the insertion port and tightened, and the lid of the fuel gauge unit is connected to the insertion port. It is necessary to push strongly.

[0004]

[Problems to be Solved by the Invention] However, since the lock ring is simply screwed into the threaded portion, the lock ring may be loosened carelessly due to vibration or impact of the vehicle. There is a possibility that a gap is generated between the fuel cells and fuel leakage occurs.

When the lock ring is tightened, a gap may be formed between the lid and the insertion opening due to incomplete or incorrect tightening (tightly tightening the lock ring), which may cause fuel leakage. .

The present invention has been made in consideration of the above circumstances, and has as its object to provide a fuel gauge unit mounting structure that can prevent the lock ring from being accidentally rotated in a loosening direction.

[0007]

According to a first aspect of the present invention, there is provided a fuel gauge unit mounting structure in which a main body is inserted into a fuel tank from an insertion opening of a fuel tank, and the insertion opening is sealed by a lid. A tooth portion formed over the entire outer periphery of the upper surface of the lid and having an upright surface and an inclined surface; and a screw portion provided on the outer peripheral surface of the insertion port, and screwed together with the inclined surface in a tightening direction. And a lock ring formed with an elastic piece that is deformed in correspondence with and is locked to the upright surface in the loosening direction.

[0008]

In the fuel gauge unit mounting structure according to the first aspect of the present invention, the fuel gauge unit body is inserted into the fuel tank from the fuel tank insertion port, and the fuel gauge unit lid is inserted into the fuel gauge unit lid. Seal tightly. In addition, it is fastened with a lock ring in order to fix the lid sealing the insertion opening.

In this case, a tooth portion having an upright surface and an inclined surface is formed on the upper surface of the lid over the entire outer periphery.
Further, an elastic piece is formed on the lock ring, and the elastic piece is deformed corresponding to the inclined surface in the tightening direction and is locked on the upright surface in the loosening direction. Therefore, when the lock ring is rotated in the tightening direction, the elastic piece alternately repeats elastic deformation and elastic return while corresponding to the inclined surface formed on the tooth part, and the position where the elastic return is performed is the position of the tooth part. It is locked with the vertical surface.

Thus, the lock ring does not rotate in a carelessly loosening direction due to vibration or impact of the vehicle. For this reason, fuel outflow leakage can be reliably prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the fuel gauge unit mounting structure of the present invention will be described with reference to FIGS.

As shown in FIG. 1, an insertion port 12 is provided in a fuel tank 10 of a vehicle. The insertion opening 12 has a cylindrical mouth-and-neck portion 14 protruding in a direction away from the fuel tank 10, and a screw portion 16 is provided on an outer peripheral surface of the mouth-and-neck portion 14.

A fuel gauge unit 18 is inserted from the insertion opening 12 through a seal packing 20. Fuel gauge unit 18
Is a main body 22 inserted into the fuel tank 10.
And a lid 24 that seals the insertion opening 12. The cover 24 of the fuel gauge unit 18 has teeth 28 at regular intervals over the entire outer periphery of the upper surface 26.
Is protruding. The tooth portion 28 includes an upright surface 30 and an inclined surface 32, and has a substantially triangular shape cut in the circumferential direction. The upright surface 30 is formed so as to be located on the radiation centered on the hole core of the insertion port 12.

The fuel gauge unit 18
Are brought into close contact with the seal packing 20 by the lock ring 34. This lock ring 34
It is formed in a ring shape from a synthetic resin (polyethylene), and the shape cut in the radial direction is an inverted L-shape. A screw portion 36 is provided on the inner peripheral surface of the lock ring 34.
Is provided, and the screw portion 36 is the screw portion 1 of the insertion slot 12.
6 is screwed. Further, a fixing surface 38 is formed on the upper part of the screw portion 36, and serves to press the upper surface 26 of the lid 24.

An elastic piece 42 is formed on the inner peripheral surface 40 of the fixed surface 38. As shown in FIG. 2, the elastic piece 42 is cantilevered from the inner peripheral surface 40 so as to be curved substantially in parallel with the inner peripheral surface 40, and is elastically deformable in the vertical direction. I have.

At the distal end of the elastic piece 42, a triangular claw 44 facing the tooth 28 of the lid 24 is projected. The inclined surface 44A of the claw portion 44 is
Is brought into contact with the inclined surface 32 of the tooth portion 28 when tightened. Further, the locking surface 44B at the tip of the elastic piece 42 is formed so as to be located on the radiation centered on the hole core of the insertion port 12, and can be locked with the upright surface 30 of the tooth portion 28. In addition, slip stoppers 46 are formed at regular intervals on the outer peripheral portion of the lock ring 34 so that the lock ring 34 can be easily tightened.

As a result, the teeth 28 formed on the lid 24 of the fuel gauge unit 18 attached to the insertion opening 12 and the claws 44 of the elastic pieces 42 provided on the lock ring 34 gradually contact each other. By elastically deforming the elastic piece 42, elastic deformation and elastic return are alternately repeated,
The position where the elastic return is performed is locked with the tooth portion 28.
Therefore, once the lock ring 34 is tightened, it does not rotate in the loosening direction.

Next, the operation of the present embodiment will be described.
In the fuel gauge unit mounting structure of the present embodiment, the main body 22 of the fuel gauge unit 18 is inserted into the fuel tank 10 from the insertion opening 12 of the fuel tank 10, and the cover 24 of the fuel gauge unit 18 is inserted through the seal packing 20. To close the slot. Further, a lock ring 34 is fastened to the screw portion 16 of the insertion port 12 in order to securely fix the lid 24 sealing the insertion port 12.

In this case, on the upper surface 26 of the lid 24, the tooth portion 2 having the upright surface 30 and the inclined surface 32 over the entire outer periphery is provided.
8 are formed. An elastic piece 42 having a claw 44 is formed on the lock ring 34. The claw 44 of the elastic piece 42 corresponds to the inclined surface 32 in the tightening direction, and the upright surface 30 in the loosening direction. Is locked. Therefore, when the lock ring 34 is rotated in the tightening direction, the claw portion 44 of the elastic piece 42 is moved to the inclined surface 32 formed on the tooth portion 28.
Elastic deformation and elastic return are alternately repeated while corresponding to the above, and the position where the elastic return is performed is locked with the upright surface 30 of the tooth portion 28.

As a result, the lock ring 34 is not accidentally rotated in the loosening direction due to the vibration or impact of the vehicle. Further, when the lock ring 34 is tightened in the tightening direction, a click sensation occurs due to the contact between the elastic piece 42 and the tooth portion 28, and the click sensation ensures that the lock ring 34 does not perform incomplete tightening or incorrect tightening. Can be tightly tightened. For this reason, fuel outflow leakage can be reliably prevented.

In the fuel gauge unit mounting structure of this embodiment, the elastic piece 42 having the claw portion 44 is provided.
The shape is not limited to the shape of the teeth 28 protruding from the upper surface 26 of the lid 24, and may be elastic pieces and teeth of other shapes that cannot rotate the lock ring 34 in the loosening direction. Further, in the present embodiment, the elastic piece 42 is provided at one place. However, the present invention is not limited to this.

Further, in the present embodiment, the elastic piece 42 and the lock ring 34 are formed integrally, but the present invention is not limited to this, and the elastic piece 42 and the lock ring 34 can be made detachable. That is, by removing the detachable elastic piece 42 as necessary, the locked state is released, and the lock ring 34 can be rotated in the loosening direction.

[0023]

According to the fuel gauge unit mounting structure of the present invention, the lock ring can be prevented from being inadvertently turned in the loosening direction. In addition, since there is a click feeling when the lock ring is tightened, there is an excellent effect that reliable tightening can be performed without performing incomplete tightening or erroneous tightening (tightening the lock ring obliquely).

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a fuel gauge unit mounting structure of the present invention.

FIG. 2 is an enlarged sectional view showing a state in which the fuel gauge unit mounting structure of the present invention is cut in a radial direction of an insertion slot.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fuel tank 12 Insertion port 22 Main body part 24 Lid 18 Fuel gauge unit 28 Teeth part 42 Elastic piece 34 Lock ring 30 Elevation surface 32 Inclined surface

Claims (1)

(57) [Scope of request for utility model registration] 1. A fuel gauge unit mounting structure in which a main body is inserted into a fuel tank from an insertion opening of a fuel tank, and the insertion opening is sealed by a lid, and is formed over the entire outer periphery of the upper surface of the lid. A toothed portion having a raised surface and an inclined surface, and a screw portion provided on the outer peripheral surface of the insertion opening, and is deformed corresponding to the inclined surface in a tightening direction and the upright surface in a loosening direction. And a lock ring formed with an elastic piece locked to the fuel gauge unit.