JPS6234939B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a carburetor with a starter that opens and closes the throttle valve by interlocking the starting operation of a starter lever with a throttle valve.

(Prior Art) Generally, the starting operation of a plunger-type carburetor with a starter is performed by turning on the starter lever and fully closing the throttle valve. is independent.

(Problems to be Solved by the Invention) Conventional carburetors with starters suffer from problems such as forgetting to close the throttle valve due to erroneous operation during an emergency stop, frictional resistance of the throttle valve operating mechanism, or joint play in the connecting member of the speed regulating mechanism. In this state, even if you turn on the starter lever and start the engine, the concentration of atomized fuel drawn into the engine will be extremely dilute due to excess air, and the engine will start. This often results in difficulties, and even if the machine starts, the throttle valve is open and the machine rotates at abnormally high speeds, and work equipment equipped with centrifugal couplings etc. will run at high speeds when the operator does not anticipate it. There was a problem.

Therefore, carburetors that fully close the throttle valve when starting the engine have been used for some time (for example, the Jikosho
52-19094 and Utility Model Publication No. 50-2907).
However, the former is not disclosed for a carburetor whose mechanism is equipped with a plunger type starter;
Furthermore, in the latter one disclosed in FIG. 2, the axis of the throttle valve and the axis of the starter plunger are arranged in directions orthogonal to each other, and therefore, the axes of both are arranged in parallel. In this case, there are still problems to be solved in order to fully close the throttle valve.

The present invention has been made in view of the above-mentioned problems of the conventional art, and includes a valve stem of a throttle valve that controls the load operation of an engine, and a plunger of a plunger starter that supplies a high concentration atomized fuel at the time of starting the engine. The valve shaft of the throttle valve has a U-shaped mounting portion of a throttle valve arm fixedly attached to the valve shaft, and a rod-shaped member is attached from a tuning portion above the mounting portion. The starter lever of the plunger starter has a base fixed to a support shaft provided on the carburetor, and forms a prong from the base and an arcuate cam surface from the prong. The driving member is extended, and the driven member is releasably linked to the driving member to form an interlocking means, and when the engine is started, the throttle valve is fully opened by the starting operation of the starter lever. To provide a carburetor with a starter, characterized in that it is closed.

(Example) Hereinafter, the configuration of the present invention will be explained based on the drawings for an example.

1 is a plunger-type carburetor with a starter. Reference numeral 2 denotes a valve shaft fixed to the throttle valve in the carburetor 1, and the axis of the valve shaft 2 and the axis of a plunger member 15, which will be described later, are parallel to each other. The valve stem 2 has a valve stem that moves from point A to point B shown in FIG.
A throttle valve arm 3 is installed that fully opens and closes a throttle valve that controls the load operation of the engine by rotating in the forward and reverse directions between the points. A gap 6 is maintained between the mounting part 4 attached to the second end surface part 2a and the tuning part 5 above the mounting part 4, forming a U-shape, and extending outward from the side surface of the tuning part 5. A rod-shaped driven member 7 is provided protrudingly, and a collar 8 is loosely fitted into the driven member so as to be freely rotatable.

Reference numeral 9 denotes a starter lever for supplying highly concentrated atomized fuel when starting the engine, and the starter lever has a base 10 at one end, and the base 10 is supported by a cylindrical boss 11 that is integrally constructed with the carburetor 1. A fork-like piece 14 is rotatably connected by a shaft 12 and a nut 13, and extends outward from the base 10, and the fork-like piece opens and closes the passage of the starter jet in the carburetor 1. It is engaged with a tip 16 of a plunger member 15, and the plunger member 15 is formed to reciprocate as the starter lever 9 rotates. Further, from one end 14a of the fork-shaped piece 14, a driving member 18 having an integral structure with the fork-shaped piece and forming an arcuate cam surface 17 extends to a position near the driven member 7, and the driving member By removably engaging the cam surface 17 of the driven member 7 with the collar 8 of the driven member 7, the throttle valve arm 3 and the starter lever 9 are removably linked, and the throttle valve is fully opened when the engine is started. An interlocking means 19 for closing is configured.

20 is a starter lever locking pawl, and 21 is a plate spring having a pawl stop 22 at its tip.

In the above structure, when starting the engine, turn on the starter lever 9 in the same way as normal operation, and as shown in Figs. 2, 3, and 4,
The starter lever 9 rotates counterclockwise about the support shaft 12 together with the fork-like piece 14 and the main drive member 18, and the fork-like piece 14 moves the tip flange 16 of the plunger member 15 outward (as shown in FIG. 2). 1) to open the starter passage in the carburetor 1, and at the same time, the driving member 18 is pulled out from its cam surface 1.
7 is brought into contact with the collar 8 of the driven member 7, and further rotated while sliding on the outer periphery of the collar, the throttle valve arm 3 is rotated clockwise (FIG. 1), and the starter lever is rotated. The locking pawl 20 resists the elastic force of the plate spring 21, pushes down the spring, and engages with the pawl stop 22 to be fixed. By this operation, the throttle valve connected to the throttle valve arm 3 is fully closed, a high concentration atomized fuel is supplied from the starter jet, and the engine enters stable dry operation at low speed. If the engagement between the locking pawl 20 and the pawl stop 22 is subsequently released and the starter lever 9 is turned OFF, the engagement between the cam surface 17 of the main driving member 18 and the collar 8 of the driven member 7 will maintain a sufficient distance. Since the throttle valve is released, the throttle valve returns to its original state, and normal load operation adjustment of the engine is performed by another operation of the throttle valve operating mechanism.

Note that the driven member 7 may be made of a tight-wound spring or other elastic material with rigidity as shown in FIG. It is also possible to provide a rigid driven member in the shape of a frustum cone whose diameter gradually increases in the direction to reduce the stress caused by the engagement between the driven member and the main driving member 18.

(Effects of the Invention) Since the present invention has the above-mentioned configuration, even if the driver or operator makes a mistake in handling the throttle valve when starting the engine, the engine can be started reliably, and when starting In addition to ensuring the safety of the operator by preventing abnormally high-speed rotation of the motor, the structure is simple and suitable for mass production, so it has excellent practical effects and can be easily disseminated.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the device of the present invention, in which Fig. 1 is a plan view of a carburetor with a starter, Figs. 2 and 3 are front views of interlocking means, Fig. 4 is a perspective view thereof, and Fig. 5 is a diagram of interlocking means. 3 is a perspective view of another embodiment of the means; FIG. DESCRIPTION OF SYMBOLS 1... Carburetor with starter, 2... Throttle valve shaft, 3... Throttle valve arm, 4... Mounting part, 5... Tuning part, 6... Gap part, 7... Driven member, 8... Collar, 9
... Starter lever, 10 ... Base, 14 ... Pronged piece,
15...Plunger member, 16...End flange part, 17...
Cam surface, 18... Acting member, 19... Interlocking means.

Claims (1)

[Claims] 1. The valve stem of the throttle valve that controls the load operation of the engine,
A plunger member of a plunger starter that supplies high-concentration atomized fuel at the time of starting the engine is provided with its axes parallel to each other, and the valve shaft of the throttle valve is
A U-shaped throttle valve arm mounting part is fixed to the valve shaft, and a rod-shaped driven member projects from a tuning part above the mounting part, and the starter lever of the plunger starter is connected to the carburetor. A base is fixed to the provided support shaft, a driving member having a fork-shaped portion and an arch-shaped cam surface extending from the base, and the driven member can be freely detached from the driving member. 1. A carburetor with a starter, characterized in that an interlocking means is configured by interlocking with the engine, and the throttle valve is fully closed by a starting operation of the starter lever when starting the engine.