JPH0736120Y2 - Vaporizer drain device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a drain device for a carburetor that extracts fuel stored in a float chamber of the carburetor.

[Prior Art] Generally, in an outboard motor, a mower, etc., an engine is carried by an operator. However, at the time of this transportation, fuel may leak from the float chamber of the carburetor mounted on the engine to the outside. Therefore, a drain device including a drain passage and a valve for opening / closing the passage has been conventionally proposed so that the stored fuel in the float chamber can be withdrawn at any time.

For example, it is shown in Japanese Utility Model Publication No. 54-82228 or Japanese Utility Model Publication No. 52-57129.

[Problems to be Solved by the Invention] According to such a conventional drain device for a carburetor, an opening / closing valve for opening / closing a drain passage, a spring for holding the opening / closing valve in a closed state, an operating rod for operating the opening / closing valve, For example, the number of parts is increased and the number of assembling steps is increased, resulting in high cost of the product.

[Means for Solving the Problems] The vaporizer drain device according to the present invention is to provide an inexpensive vaporizer drain device with a reduced number of parts and assembly steps. A cylindrical drain boss provided with a bottomed drain hole that opens to the bottom of the float chamber is provided on the outer side of the chamber main body so as to project therefrom, and is further opposed to each other substantially orthogonal to the longitudinal axis Y-Y of the drain boss. A through hole penetrating through the drain hole is formed on the outer peripheral side of the drain boss, and an operating rod having an axial length substantially the same as the outer diameter of the drain boss is movably arranged in the through hole. On the outer peripheral side of the drain boss, a tubular drain pipe made of an elastic material that closes at least the through hole is fitted and arranged, and at least one of the through holes is formed with a pressing protrusion on the outer periphery of the drain pipe. , In addition, on the outer periphery of the drain pipe including the pressing protrusion, a ring-shaped formed by a relief portion that does not press the outer periphery of the drain pipe at a position substantially opposite to each other and a pressing portion that presses the outer periphery of the drain pipe. The control member is arranged.

[Operation] When the fuel is discharged from the float chamber, by rotating the control member, the pressing portion of the control member presses the pressing projection of the drain pipe toward the inside of the drain boss to move the operating rod. The other through hole is opened on the inner peripheral surface of the drain pipe, and a gap h communicating with the atmosphere is formed between the outer peripheral side portion of the drain boss and the inner peripheral surface of the drain pipe to discharge the fuel in the float chamber to the atmosphere. It is a thing.

[Embodiment] An embodiment of the vaporizer drain device according to the present invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 1 denotes a carburetor main body having an intake passage 2 penetrating the inside thereof and a recess 1A provided below, and a float chamber main body 3 is arranged corresponding to the recess, and a collar portion 1B of the carburetor main body 1 and a float chamber main body Three
The floating chamber 5 is formed by fastening the collar portion 3A of the above with the screw 4.

The float 6 is arranged in the float chamber 5 and
The amount of fuel flowing into the float chamber 5 is controlled by a joint action of a valve seat and a float valve (not shown) to form a constant liquid level XX in the float chamber 5.

Reference numeral 7 denotes a cylindrical drain boss projecting downward from the bottom of the outer side portion 3A of the float chamber main body 3. The drain boss 7 has a lower end closed and an upper end opened to the bottom 5A of the float chamber 5. Drain holes 8 are formed in the drain boss 7. Near the bottom of the drain hole 8, outer peripheral side portions 7A, 7B of the drain boss 7 facing each other at substantially right angles to the longitudinal axis Y-Y of the drain boss 7.
Through holes 9A and 9B are formed through the drain hole 8. Therefore, the through holes 9A and 9B face each other. A rod-shaped operating rod 10 having an axial length L substantially the same as the outer diameter φA of the drain boss 7 is movably arranged in the through holes 9A and 9B. Both ends of the operating rod 10 are movably arranged. Are supported in the through holes 9A and 9B.

The axial length L of the operating rod 10 is preferably smaller than the outer diameter φA of the drain boss 7.

A drain pipe 11 made of an elastic material such as rubber or synthetic resin is fitted to the outer peripheral portion 7C including the outer peripheral portions 7A and 7B facing each other of the drain boss 7. The lower end of 11 is open to the atmosphere and the through holes 9A and 9B are closed by the inner peripheral surface 11A of the drain pipe 11.

This is because the inner peripheral surface 11A of the drain pipe 11 made of an elastic material is elastically fitted to the outer peripheral side portion 7C of the drain boss 7. Further, a pressing protrusion 11C extending outward is integrally formed on an outer periphery 11B corresponding to one of the through holes of the drain pipe 11.

Reference numeral 12 denotes a ring-shaped control member fitted to the outer circumference 11B of the drain pipe 11 including the pressing protrusion 11C of the drain pipe 11, and the outer circumference 11B of the drain pipe 11 is provided at positions substantially opposite to each other of the control member 12. Relief parts 12A and 12B that do not press
And pressing portions 12C and 12 that press the outer circumference 11B of the drain pipe 11.
D is formed.

Thus, no external force is applied to the pressing projection 11C of the drain pipe 11 in a state where it is not necessary to extract the fuel in the float chamber 5, such as when the engine is operating. This can be achieved by arranging the relief portion 12B of the control member 12 so as to correspond to the pressing portion 11C as shown in FIG. According to this, since the operating rod 10 does not protrude from the outer peripheral side portion 7C of the drain boss 7, the inner peripheral surface 11A of the drain pipe 11 is fitted and held by the outer peripheral side portion 7C of the drain boss 7 with its elastic force. The through holes 9A and 9B are securely closed and held by the inner peripheral surface 11A of the drain pipe 11, so that the fuel stored in the floating chamber 5 does not leak to the outside through the drain hole 8.

When the fuel in the floating chamber 5 is removed after the engine is stopped, the control member 12 is moved from the state of the control member 12 shown in FIG. 2 to approximately 45 degrees clockwise as shown in FIG. Rotate.

As a result, the pressing portion 12C of the control member 12 causes the drain pipe 1
The pressing portion 11C of 1 is pressed inward, that is, toward the drain hole 8 side.

According to this, since the left end face of the operating rod 10 supported in the through hole 9A on the left side in the figure is pressed rightward by the pressing protrusion 11C, the right end face of the operating rod 10 is located rightward from the through hole 9B. The inner peripheral surface 11A of the drain pipe 11 is expanded to the right in the figure by projecting to the inside. The inner peripheral surface 11A of the drain pipe 11 opens the through hole 9B and the drain boss 7 below the through hole 9B. A gap h is formed between the outer peripheral side portion 7B and the inner peripheral surface 11A of the drain pipe 11. This state is shown in FIGS. 3 and 4. At this time, since the escape portion 12A corresponds to the right end surface of the control member 12 corresponding to the through hole 9B, the movement of the control member 12 is not obstructed.

Thus, the fuel stored in the floating chamber 5 is drain hole 8
-Through hole 9B-Outer peripheral side 7B of drain boss 7 and drain pipe
The gas flows out into the drain pipe 11 through a gap h between the inner peripheral surface 11A and the inner peripheral surface 11A and is then discharged to the outside.

[Effects of the Invention] As described above, according to the drain device of the carburetor according to the present invention, the opening / closing valve function for opening and closing the through hole provided in the drain boss of the drain pipe itself and the pressing protrusion for operating it are integrated. In addition to providing the operating rod inside the through-hole, and arranging the control member with the pressing portion that presses the drain pipe pressing portion and the non-pressing portion and the escape portion on the outer periphery of the drain pipe, the number of parts is greatly reduced. In addition, even when assembling the control rod, it is only necessary to arrange the operating rod in the through hole, fit the drain pipe to the drain boss, and then fit the control member. As a result, the drain device of the carburetor which is extremely inexpensive can be provided by the above. Further, by disposing the control member, it is not necessary for the operator to continuously press the pressing portion during drain removal.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a vaporizer drain device according to the present invention, FIG. 2 is a transverse sectional view taken along the line II-II of FIG. 1, and FIG. Longitudinal section, 4th
The drawing is a cross-sectional view taken along the line IV-IV in FIG. 3 ... Float chamber body, 3A ... Outside part, 5 ... Float chamber, 5A ...
… Bottom part, 7 …… Drain boss, 7A, 7B …… Outer peripheral side of drain boss facing each other, 7C …… Outer peripheral side, 8 …… Drain hole, 9A, 9B …… Through hole, 10 …… Operating rod, 11 …… Drain pipe, 11A …… Inner peripheral surface, 11C …… Pressing protrusion, h …… Gap,
12 ... Control member, 12A, 12B ... Control member relief part, 12
C, 12D ... Pressing part of control member,

Claims (1)

[Scope of utility model registration request] 1. A carburetor in which a concave chamber 1A of a carburetor main body 1 and a float chamber main body 3 form a float chamber 5 and a constant liquid surface is formed in the float chamber, and an outer portion 3A of the float chamber main body 3 A cylindrical drain boss 7 provided with a bottomed drain hole 8 opening to the bottom 5A of the float chamber 5 is provided in a protruding manner, and the longitudinal axis Y-Y of the drain boss 7 is further provided.
The outer peripheral side portions 7 of the drain boss 7 that are substantially orthogonal to each other and face each other
Through holes 9A and 9B are formed in A and 7B through the drain hole 8, and an operating rod 10 having an axial length L substantially equal to the outer diameter φA of the drain boss 7 is formed in the through holes 9A and 9B. On the other hand, at least one of the through holes is arranged so as to be movable, and a tubular drain pipe 11 made of an elastic material for closing at least the through holes 9A and 9B is fitted and arranged on the outer peripheral side portion 7C of the drain boss 7. The pressing projection 11C is formed on the outer circumference of the drain pipe 11 corresponding to, and the outer circumference 11B of the drain pipe 11 including the pressing projection is not pressed against the outer circumference 11B of the drain pipe 11 at positions substantially opposite to each other. Escape part 12A, 12B
And a ring-shaped control member formed by pressing portions 12C and 12D that press the outer circumference of the drain pipe 11 are fitted and arranged, and when the fuel is discharged from the floating chamber 5, the control member is rotated. By pressing the pressing projection 11C of the drain pipe 11 toward the inside of the drain boss 7 by the pressing portion of the control member, the operating rod 10 is moved and the inner peripheral surface 11 of the drain pipe 11 is moved.
A drain device for a carburetor in which the other through hole is opened at A and a gap h communicating with the atmosphere is formed between the outer peripheral side portion 7C of the drain boss 7 and the inner peripheral surface 11A of the drain pipe 11.