JPH07113473A - Fuel cock - Google Patents

Abstract

(57) [Summary] [Purpose] A large operating force is not required when operating the fuel cock, and the sealing property of the operating lever with respect to the fuel cock body is improved. [Structure] Fuel cock 4 equipped on the motorcycle
In the fuel cock body 6 in which the valve hole 18 having the tapered inner peripheral surface 18a in which the tank side fuel passage and the carburetor side fuel passage are opened is formed, and the tapered inner peripheral surface 18a of the valve hole 18 It has a tapered outer peripheral surface 8a having a corresponding shape, and the tapered outer peripheral surface 8a is a tapered inner peripheral surface 1
8a, which is inserted into the valve hole 18 so as to be in close contact with 8a and is urged by the spring 16 in the direction from the large diameter side of the tapered outer peripheral surface 8a to the small diameter side, and the tapered outer peripheral surface of the taper valve 8 8a, the operating lever 10 is arranged on the smaller diameter side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cock for closing or switching a fuel passage for supplying fuel in a fuel tank to a carburetor.

[0002]

2. Description of the Related Art Conventionally, for example, a fuel cock for closing or switching a fuel passage for supplying fuel in a fuel tank provided in a motorcycle to a carburetor is as shown in FIGS. Was (for example,
JP-A-58-57568). FIG. 3 is a side view showing the overall configuration of a motorcycle including a conventional fuel cock. FIG. 4 is a side view of a fuel tank having a conventional fuel cock attached to the lower surface. Also, FIG.
FIG. 4 is a view of a conventional fuel cock as viewed from the side of the vehicle. 6 is a cross-sectional view taken along line VI-VI in FIG.

As shown in FIGS. 3 and 4, an engine a is arranged between a front wheel and a rear wheel of a motorcycle, and a fuel tank b containing a fuel is attached above the engine a. The conventional fuel cock c is provided on the lower surface b1 of the fuel tank b, and the tube e communicates the fuel cock c with the carburetor d located behind the cylinder part of the engine a.

This fuel cock c, as shown in FIG. 5 or 6, has an ON-side fuel passage portion f for normal use.
And a reserve side fuel passage portion g as a spare and a fuel cock body i attached to the lower surface b1 of the fuel tank b via a gasket h, and rotatably arranged in the fuel cock body i. A tapered valve (valve body) j that closes the fuel supply from the fuel tank b to the carburetor d by rotating the fuel tank b or switches between the ON-side fuel passage portion f and the reserve-side fuel passage portion g. An operating lever k that is coaxial with the taper valve j and that is used to rotate the taper valve j, and a fuel cock guide screw (hereinafter referred to as a guide screw) p that guides the rotation of the operation lever k. Is equipped with.

On the fuel cock body i, a carburetor side fuel passage portion m is provided so as to project in the vehicle width direction. Further, as shown in FIG. 6, a taper in which passage holes of the carburetor-side fuel passage portion m, the ON-side fuel passage portion f, and the reserve-side fuel passage portion g are opened in the lower portion of the fuel cock body i. A valve hole n having a circular inner peripheral surface n1 is provided. Also,
A screw hole i1 for screwing the guide screw p is opened in the valve hole n from below.

The tapered valve j has a tapered outer peripheral surface j corresponding to the tapered inner peripheral surface n1 of the valve hole n.
Has 1. Further, on the large-diameter side end surface of the tapered outer peripheral surface j1 of the tapered valve j, there is formed a recess j2 having a substantially rectangular cross section with which the operating lever k is engaged when the operating lever k is rotated. . Further, the spring q is in contact with the bottom of the recess j2, and the spring q
The taper valve j is constantly urged from the large diameter side of the tapered outer peripheral surface j1 toward the small diameter side (reference numeral s direction) by the elastic force of. Inside the taper valve j, there is provided a switching passage (not shown) that opens to the tapered outer peripheral surface j1, and the switching passage (not shown) is the carburetor-side fuel passage portion m and the ON-side fuel passage portion f or the reserve. It enables communication with the side fuel passage portion g.

The operating lever k is mainly composed of a shaft portion which is inserted into the valve hole n and a handle portion for rotating the taper valve j. On the end surface of the shaft portion of the operating lever k, there is provided a convex portion k1 for engaging the concave portion j2 of the tapered valve j and transmitting the rotational force to the tapered valve j when the handle portion is rotated. There is. Further, a spring hole k2 into which a spring q for biasing the taper valve j is inserted is formed in the end surface of the shaft portion. Also,
An annular groove k3 guided by the tip portion p1 of the guide screw p is formed on the outer periphery of the axially substantially central portion of the shaft portion, and an O-ring r is formed on the outer peripheral surface of the shaft portion in the vicinity of the convex portion k1.
There is provided an annular O-ring groove k4 in which is mounted.

With the above-described configuration of each part, when the fuel passage for supplying the fuel in the fuel tank b to the carburetor d is closed or switched, the operating lever k is used.
And the taper valve j are rotated so that the position of the opening of the switching passage (not shown) provided in the taper valve j is changed to the carburetor-side fuel passage portion m,
The ON-side fuel passage portion f or the reserve-side fuel passage portion g is aligned with or removed from the respective openings.

[0009]

However, in the above-mentioned conventional fuel cock c, the taper valve j
Is constantly urged in the s direction by the spring q, the outer peripheral surface j1 of the taper valve j easily digs into the inner peripheral surface n1 of the valve hole n, and the taper valve j cannot be operated for a long time unless the fuel valve c is operated for a long time. It may stick to the cock body i. So in this case,
There is a risk that the initial operation force required when the operation lever k is rotated may become large.

On the other hand, since the operating lever k is also biased by the subring q in the direction opposite to the s direction, it receives a force in the direction indicated by the symbol t, and the sealing property of the O-ring r may be deteriorated. was there.

The present invention has been made in view of the above-mentioned problems of the prior art, and its problem is large when operating the closing or switching of the fuel passage for supplying the fuel in the fuel tank to the carburetor. An object of the present invention is to provide a fuel cock that does not require an operating force and that improves the sealing property of the operating lever with respect to the fuel cock body.

[0012]

The present invention has the following constitution in order to solve the above problems. That is, the present invention relates to a fuel cock body having a tank side fuel passage and a carburetor side fuel passage, and a tank side fuel passage that is rotatably disposed in the fuel cock body and is rotated. A fuel tank having a valve body that closes communication with the carburetor-side fuel passage or switches the tank-side fuel passage, and an operating lever that is coaxial with the valve body and that is used to rotate the valve body. In a fuel cock for closing or switching a fuel passage for supplying the fuel in the inside to a carburetor, a valve hole having a tapered inner peripheral surface where each of the tank side fuel passage and the carburetor side fuel passage is opened is formed. And a shape corresponding to the tapered inner peripheral surface of the valve hole. Has a tapered outer peripheral surface, and is inserted into the valve hole so that the tapered outer peripheral surface is in close contact with the tapered inner peripheral surface, and in the direction from the large diameter side of the tapered outer peripheral surface to the small diameter side. A fuel cock comprising: a valve body biased by an elastic member; and an operating lever arranged on a smaller diameter side of the tapered outer peripheral surface of the valve body.

[0013]

Therefore, according to the present invention, since the operating lever is arranged on the smaller diameter side of the tapered outer peripheral surface of the valve body, the operating lever is moved in the taper valve direction (small diameter of the tapered outer peripheral surface during operation). Side to the larger diameter side), the valve body can be moved in a direction opposite to the direction in which the tapered outer peripheral surface of the valve body bites into the tapered inner peripheral surface. Therefore, by rotating the operation lever after pressing the operation lever, the valve body can be smoothly rotated. It is also possible to prevent the valve from being galled onto the fuel cock body. By using the clearance between the operating lever and the fuel cock body, the operating lever can be pressed in the direction of the valve body (the direction from the small diameter side of the tapered outer peripheral surface to the large diameter side). .

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a fuel cock attached to a lower surface of a fuel tank as seen from a vehicle traveling direction. FIG. 2 is an exploded perspective view showing the overall structure of the fuel cock.

In the embodiment of the fuel cock according to the present invention, as shown in FIG. 1 and FIG. 2, the fuel passage for supplying the fuel in the fuel tank 2 provided in the motorcycle to the carburetor is closed or switched. It is for doing. The fuel cock 4 has a fuel cock body 6 having a fuel passage on the tank side and a fuel passage on the carburetor side, and is rotatably disposed in the fuel cock body 6 and is rotated to rotate the fuel on the tank side. A taper valve 8 for closing the communication between the passage and the fuel passage on the carburetor side or for switching the fuel passage on the tank side
And an operating lever 10 that is coaxial with the taper valve 8 and that is used to rotate the taper valve 8.

The fuel cock 4 includes a spring 16 for urging the taper valve 8 in the fuel cock body 6 and a fuel attached to an opening portion 18c of a valve hole 18 provided in the fuel cock body 6 which will be described later. It has a cock cover (hereinafter, simply referred to as a cover) 14 and a guide screw 12 for guiding the rotation of the operating lever 10.

In this fuel cock 4,
The gasket, the tank-side fuel passage (ON-side fuel passage or reserve-side fuel passage), the carburetor-side fuel passage, and the like, which are interposed when the fuel cock 4 is attached to the lower surface 2a of the fuel tank 2, are the same as the conventional configuration Therefore, the description thereof is omitted.

The fuel cock body 6 is formed with a valve hole 18 having a tapered inner peripheral surface 18a in which the fuel passage on the tank side and the fuel passage on the carburetor side are opened. , The small-diameter side opening 18b and the large-diameter side opening 1 of the tapered inner peripheral surface 18a which penetrates the fuel cock body 6.
8c and. The small diameter side opening 18b has an inner diameter larger than the small diameter of the tapered inner peripheral surface 18a, and the guide screw 12 is screwed on the inner peripheral surface of the small diameter side opening 18b. Screw hole 18 to be fastened
d is open.

The taper valve 8 has the valve hole 1
8 has a tapered outer peripheral surface 8a having a shape corresponding to the tapered inner peripheral surface 18a, and the spring 16 is provided on the large diameter side end surface of the tapered outer peripheral surface 8a.
Is formed with a spring hole 8b into which the operation lever 10 is rotated when the operation lever 10 is rotated.
Is formed with a recess 8c having a rectangular cross section.

The cover 14 is attached to the opening 18c on the large diameter side of the fuel cock body 6, has a flange shape, and the spring 16 is inserted into the end face on the attachment side. Hole 1
4a is provided.

The operating lever 10 is arranged on the rotary shaft on the smaller diameter side of the tapered outer peripheral surface 8a of the taper valve 8, and mainly comprises a shaft portion and a handle portion. Further, on the shaft portion, a convex portion 10a having a rectangular cross section that engages with the concave portion 8c of the tapered valve 8 when the operation lever 10 is rotated, and an annular O-ring groove 10b in which the O-ring 22 is mounted. And an annular groove 10c guided by the guide screw 12. The protrusion 10a of the operating lever 10 and the taper valve 8
The shape of the concave portion 8c is not limited to the shape shown in this embodiment, and other shapes are also within the technical scope of the present invention as long as the rotation of the operating lever 10 can be transmitted to the taper valve 8. is there.

When assembling this fuel cock 4, first, the tapered outer peripheral surface 8a of the taper valve 8 is formed.
The tapered valve 8 is inserted into the valve hole 18 from the large-diameter side opening 18c of the valve hole 18 so that the tape valve 8 closely contacts the tapered inner peripheral surface 18a. And the spring 16
Is inserted into the spring hole 8b of the taper valve 8 and the spring hole 14a of the cover 14, and the cover 1
4 is attached to the large diameter side opening 18c of the valve hole 18 by a screw member or the like.

As a result, the taper valve 8 is biased by the spring 16 in the direction from the large diameter side to the small diameter side of the tapered outer peripheral surface 8a (direction indicated by reference numeral 20).

Next, the operating lever 10 is provided with a valve hole 18 so that the shaft 10a of the operating lever 10 already fitted with the O-ring 22 is fitted into the recess 8c of the taper valve 8. Is inserted into the valve hole 8 through the opening 18b on the small diameter side. The guide screw 12 is screwed into the screw hole 18d of the fuel cock body 6, and the tip portion 12a of the guide screw 12 is
Is projected into the annular groove 10c of the operating lever 10.

The size of the annular groove 10c or the tip portion 12a of the guide screw 12 is set so that a clearance is provided between the annular groove 10c and the tip portion 12a of the guide screw 12. Also,
By using this clearance, the clearance is set so that at least the operating lever 10 can contact the tapered valve 8 when the operating lever 10 is moved in the direction of the tapered valve 8. Further, in the assembly process of the fuel cock 4, the taper valve 8 is provided in the valve hole 18 of the fuel cock body 6.
Alternatively, any one of the operating levers 10 may be inserted first.

According to the structure of the fuel cock 4 of the present embodiment as described above, since the operating lever 10 is arranged on the smaller diameter side of the tapered outer peripheral surface 8a of the tapered valve 8, the carburetor is separated from the fuel tank 2. When the supply of fuel to the fuel tank is closed or the ON-side fuel passage and the reserve-side fuel passage are switched, for example, the clearance between the annular groove 10c and the tip portion 12a of the guide screw 12 is used to operate. The lever 10 is pushed in the direction of the taper valve 8 (the direction from the small diameter side to the large diameter side of the tapered outer peripheral surface 8a shown by reference numeral 24) and then rotated, whereby the tapered outer periphery of the taper valve 8 is formed. The tapered valve 8 is moved within the clearance range in a direction opposite to the direction in which the surface 8a bites into the tapered inner peripheral surface 18a, and The Barubu 8 can be rotated smoothly.

Therefore, according to the fuel cock 4 of this embodiment, it is possible to easily rotate the operating lever 10 at the time of initial operation without requiring a large operating force. Further, since it is possible to prevent the taper valve 8 from being galled onto the fuel cock body 6, the close contact between the fuel cock body 6 and the taper valve 8 is secured. In addition, the operating lever 10 has a spring 16
Since no force is exerted on the O-ring 22, the sealability of the O-ring 22 with respect to the opening 18b on the small diameter side can be improved.

The present invention is not limited to this embodiment, but can be applied to a so-called negative pressure type cock that opens and closes the cock by using the suction pressure of the engine, a cock attached to the carburetor side, and the like. It can be applied to all cocks that close or switch the flow passage.

[0029]

According to the present invention, a large operating force is not required when closing or switching the fuel passage for supplying the fuel in the fuel tank to the carburetor, and the fuel cock body of the operating lever is used. It is possible to improve the sealing property against. Further, the closeness between the fuel cock body and the valve body can be secured.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fuel cock according to an embodiment attached to a lower surface of a fuel tank as seen from a traveling direction of a vehicle.

FIG. 2 is an exploded perspective view showing an overall configuration of a fuel cock according to an embodiment.

FIG. 3 is a side view showing an overall configuration of a motorcycle including a conventional fuel cock.

FIG. 4 is a side view of a fuel tank having a conventional fuel cock attached to a lower surface.

FIG. 5 is a view of a conventional fuel cock as viewed from the side of the vehicle.

6 is a sectional view taken along line VI-VI of FIG.

[Explanation of symbols]

 2 fuel tank 4 fuel cock 6 fuel cock body 8 taper valve (valve body) 8a tapered outer peripheral surface 10 operation lever 16 spring (elastic member) 18 valve hole 18a tapered inner peripheral surface

Claims (1)

[Claims] 1. A fuel cock body having a tank side fuel passage and a carburetor side fuel passage, and the tank side fuel passage and the carburetor being rotatably disposed in the fuel cock body and being rotated. Inside the fuel tank, which has a valve body for closing communication with the fuel passage on the side or for switching the fuel passage on the tank side, and an operating lever which is coaxial with the valve body and which is used for rotating the valve body. A fuel cock for closing or switching a fuel passage for supplying the fuel to the carburetor, a valve hole having a tapered inner peripheral surface where each of the tank side fuel passage and the carburetor side fuel passage is opened is formed. And a taper having a shape corresponding to the tapered inner peripheral surface of the valve hole. The tapered outer peripheral surface is inserted into the valve hole so that the tapered outer peripheral surface closely contacts the tapered inner peripheral surface, and the tapered outer peripheral surface is elastic in the direction from the large diameter side to the small diameter side. A fuel cock, comprising: a valve body biased by a member; and an operating lever arranged on a smaller diameter side of the tapered outer peripheral surface of the valve body.