JPH0643479Y2 - Carburetor operating device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a carburetor operating device, and more specifically, to prevent the opening / closing operation from being affected by the length, resistance, etc. of the operating wire that operates the opening of the throttle valve. The present invention relates to a carburetor operating device improved.

[Prior Art] Some carburetors such as small engines have adopted a choke valveless type carburetor that does not have a choke valve.When starting the engine, first operate the throttle lever via a wire to activate the carburetor. The engine is started by a starter such as a recoil starter in this state.

In this state, as shown in FIG. 3, the arm 2A of the needle lift cam 2 which is biased in the clockwise direction is located in the rotation region of the tip portion 1A of the throttle lever 1, and the throttle lever 1 By the rotation operation of No. 1, the needle is lifted from the nozzle of the carburetor in the withdrawal direction to increase the nozzle opening and supply a rich air-fuel mixture to the engine. At the same time, the throttle lever 1 contacts the pin 3A provided on the lever 3 for the throttle valve to rotate the throttle valve by a predetermined amount to increase the air supply amount.

When the engine is started in this state and the throttle lever 1 is further rotated via the wire W after the engine is started, the engagement between the tip portion 1A of the throttle lever 1 and the arm 2A is released, and the arm 2A rotates clockwise. Then, the operation is stopped in the states shown in FIGS.

In this state, the needle is slightly lifted and maintained at a low speed. When the throttle lever 1 is further pulled, the pin 3A provided on the lever 3 for the throttle valve is rotated about the rotation center 3X by the throttle lever 1 so that the throttle opening is set according to the operation amount.

Opening and closing the carburetor nozzle with a needle prior to opening and closing the throttle valve after starting the engine,
The relationship between the lift by the needle lift cam and the throttle lever 1 is shown in FIG.

[Problems to be solved by the device]

In the carburetor operating device as described above, the carburetor and the hand-side throttle lever, which is the operator's operating unit, are connected via the inner cable inserted through the outer cable, and can be operated remotely. ing. Therefore, if the wire that is the inner cable is always operated in a straight line, the throttle valve opens in proportion to the operation amount of the throttle lever at hand, but normally the outer cable draws a curve. In this state, the wire inserted inside is slack, and because it is interfered with by contacting the inside of the outer cable due to being pulled around during installation, the throttle valve is proportional to the operation amount of the throttle lever. There was a problem that I could not open and close, especially.

Therefore, even if the throttle lever at hand is moved to the starting position, the slack of the wire is extended, so that the throttle lever is not moved to the starting position, which sometimes makes starting difficult.

This is because the throttle lever 1 touches the arm 2A of the needle lift cam 2 to operate, and then touches the pin 3A of the throttle valve lever 3 to perform the desired operation. Cable tension,
This is because it is significantly affected by relaxation.

Therefore, in the present invention, the throttle lever does not hit and actuate both the arm and the pin, but at the time of starting, the cable rotates only the lift cam arm,
By rotating the lever of the throttle cam in conjunction with the rotation of the lift cam arm, it is an object to always maintain a constant operation gap between the arm and the lever.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention is an operating lever of a throttle valve 17 that horizontally rotates about a vertical rotation shaft 17A of the throttle valve 17 when the engine is started.
14 is rotated by a lift cam 11 which moves up and down to open a nozzle 18 together with a needle 17B for opening a nozzle 18 by a lift cam 11 which rotates about a horizontal axis, and a rotational movement of a throttle lever 12 which horizontally rotates about a vertical axis 12B. In the carburetor operating device configured to rotate the operation lever 14 together, the lift cam 11 includes a cam lever 11A protruding in a rotation region of a horizontal operation tip 12A of the throttle lever 12 and an operation lever of the throttle valve 17. 14 includes a locking arm 11B that can project into the rotation region, and the horizontal operation tip portion 12A of the throttle lever 12 is the cam lever 1
By riding on 1A, the cam body 11C of the lift cam 11 slides on the driven member 17C of the throttle valve 17 to lift the throttle valve 17 and the needle 17B, and the lock arm 11B integral with the lift cam 11 operates the operating lever. The throttle valve 17 is rotated by a predetermined amount to open the throttle valve 17 by a predetermined amount.

[Action]

The throttle lever is rotated by the pulling action of the throttle wire inserted in the outer cable,
When the throttle lever is rotated, the lift cam lever is rotated first, and this lever is also rotated together with the throttle valve lever that opens and closes the throttle valve, and the operating intervals of both levers are always kept constant with the adjusting screw. It

〔Example〕

1 and 2 of the drawings attached with an embodiment of the present invention.
It will be described with reference to FIGS. In these drawings, reference numeral 11 denotes a cam for lifting a needle 17B fixed in the middle of a throttle valve 17 rotating about a vertical rotation shaft 17A, and this cam 11 has a cam lever for rotating the cam 11. 11A is provided. This cam lever 11A
Is rotated about the horizontal axis, the cam body 11C rotates, and the cam body 11C is in sliding contact with the lower surface of the driven member 17C that is operated integrally with the throttle valve 17.

Therefore, by rotating the cam lever 11A, the throttle valve 17 is moved up and down, and the needle 17B fixed in the middle of the throttle valve 17 is also moved up and down. The cam lever 11A projects into the rotation region of the horizontal operation tip portion 12A of the throttle lever 12 that rotates about the vertical shaft 12B, and the cam 11 is formed with a locking arm 11B that is integral with the cam 11. The locking arm 11B is provided with a female screw portion, and the adjusting screw 13 is screwed into the female screw portion so that the relative distance from the cam lever 11A is kept constant. The tip portion 13A of the adjusting screw 13 can abut the tip portion 14A of the operation lever 14 of the throttle valve.

Then, one end of a throttle wire 16 for linking with a throttle operating section is attached to the throttle lever 12 which is given a return habit by a return spring 15, and the throttle wire is operated by operating a throttle lever at hand in the throttle operating section. When the pulling stroke 16 is applied, the throttle lever 12 is horizontally rotated about the vertical shaft 12B according to the pulling stroke.

Rotational movement of the throttle lever 12 rotates the lift cam 11 via the cam lever 11A (position in FIG. 4),
The nozzle 18 is opened by lifting the needle 17B, and the horizontal operation tip 12A of the throttle lever 12 is moved to the cam lever 11A.
The engine is started in the state of riding on the top (position of FIG. 4, FIG. 1, FIG. 5 (b)).

At this time, the tip of the adjusting screw 13 of the locking arm 11B of the lift cam 11 comes into contact with the side surface of the operation lever 14 to rotate the operation lever 14. This rotation amount is constant in order to maintain a constant position at the position where the cam lever 11A is rotated to the maximum. That is, the opening degree of the throttle valve 17 becomes a predetermined amount.

When the throttle wire 16 is further pulled after the engine is started, the throttle lever 12 gets over the cam lever 11A and the cam lever 11 is returned to the original position (the position shown in FIG. 4 and FIG. 5A). When the throttle wire 16 is further pulled, the throttle lever 12 engages with the pin 14B fixedly provided on the operation lever 14, and the throttle valve 17 is opened according to the operation amount of the throttle lever at the operation portion, and the throttle valve 17 The air-fuel mixture is supplied to the engine in the fully opened state (Fig. 5 (a)).

As mentioned above, the cam lever 11A by the throttle lever 12
The operation timing between the operation lever 14 of the throttle valve 17 and the operation lever 14 is controlled only by the interval in the rotational movement of the cam lever 11A and the adjusting screw 13, and
This is done when the horizontal operation tip 12A of the throttle lever 12 is mounted on 11A, so this horizontal operation tip 12A
Since the dimensional variations and changes of the throttle wire 16 are absorbed at A, the throttle wire 16 is not affected by tension or relaxation at all.

[Effect of device]

As is clear from the above description, according to the carburetor operating device of the present invention, when the engine is started, the lift cam of the needle is rotated by the rotational movement of the throttle lever, and the operation lever of the throttle valve is rotationally operated by the rotation of the lift cam. Therefore, it is possible to perform the opening and closing operation of the throttle valve accurately without being affected by the dimensional variation of the throttle wire, the tension state, the loose state, etc., and to easily start the engine. You can

[Brief description of drawings]

FIG. 1 is a perspective view of a main portion of a carburetor operating device according to the present invention, FIG. 2 is an explanatory view showing the same operating state, FIG. 3 is a perspective view of a conventional carburetor operating device, and FIG. 4 is a cam and a throttle lever. FIG. 5 is an explanatory view showing the lift height of the needle according to the relationship, FIG. 5 (a) is a vertical sectional view of the entire carburetor operating device according to the present invention, and FIG. 11 …… Lift cam, 11A …… Cam lever, 11B …… Locking arm, 11C …… Cam body, 12 …… Throttle lever, 12A…
… Operation tip, 12B …… Vertical axis, 13 …… Adjust screw, 1
3A ... Tip, 14 ... Operating lever, 14A ... Tip, 14B
...... Pin, 15 ...... Return spring, 16 ...... Throttle wire,
17 …… Throttle valve, 17A …… Vertical rotation axis, 17B ……
Needle, 17C ... driven member, 18 ... carburetor nozzle.

Claims (1)

[Scope of utility model registration request] 1. A throttle valve (1
Needle (17B) to open the nozzle (18) by moving the operating lever (14) of the throttle valve (17) that rotates horizontally around the vertical rotation axis (17A) of 7) while rotating it up and down. And a lift cam (11) that rotates about a horizontal axis as a center, and a rotation movement of a throttle lever (12) that rotates horizontally about a vertical axis (12B) causes the operation lever (14) to rotate together. In the carburetor operating device configured as described above, the lift cam (11) includes a cam lever (11A) protruding in a rotation region of a horizontal operating tip (12A) of the throttle lever (12), and an operating lever of a throttle valve (17) ( 1
4) A locking arm (11B) that can project in the rotation area is provided, and the horizontal operation tip (12A) of the throttle lever (12) rides on the cam lever (11A) to move the lift cam (11). The cam body (11C) slidably contacts the driven member (17C) of the throttle valve (17) to lift the throttle valve (17) and the needle (17B), and the locking arm (11B) integrated with the lift cam (11).
The carburetor operating device is characterized in that the throttle valve (17) is opened by a predetermined amount by rotating the operating lever (14) by a predetermined amount.