JPH0115876Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the overall structure of a general-purpose engine, and in particular to the arrangement of a governor device.

FIG. 1 is a sectional view showing a conventional general-purpose engine. In the figure, 1 is a cylinder that constitutes the engine body, and 2 is a crank chamber that supports a crankshaft 3. The crankshaft 3 is composed of a flywheel-side crankshaft 3a and an output-side crankshaft 3b. Further, the crank chamber 2 is composed of a flywheel side crank chamber 2a and an output side crank chamber 2b. A side cover 4 is fixed to the side of the crank chamber 2 with bolts or the like, and forms a governor chamber A. Reference numeral 5 denotes a governor device, which is of a centrifugal weight type and is composed of a weight 6, a weight receiver 7 integrated with the crankshaft 3b, a sliding tube 8, and an operating arm 9. Reference numeral 10 denotes a flywheel, in which a magnetic pole material 11 and blades 12 are integrally formed. Reference numeral 13 denotes an ignition coil, which is attached to a support 14 integral with the crank chamber 2 and has a predetermined distance from the inner circumference of the magnetic pole material 11. 15 is a recoil starter, 16 is a piston, 17 is a spark plug, 18 is a baffle plate, and 19 is a balance weight.

However, the conventional method described above has the following drawbacks.

Since the governor device 5 is formed on the side of the crank chamber 2b, the dimension _L0 from the center of the engine to the stepped portion of the crankshaft 3 becomes long, and it needs to be supported pivotably by the side cover 4, and the entire engine They tend to be larger in size.

The purpose of the present invention is to provide a governor device that eliminates the above-mentioned drawbacks, and its features include a weight that is swingably supported on a balance weight, one end of which is in contact with the weight, and a governor device that recoils. an intermediate rod having a thrust bearing at the other end on the starter side and capable of sliding within the shaft center hole of the balance weight;
A push rod whose one end is urged to come into contact with the thrust bearing of the intermediate rod and can slide inside the recoil starter, and a link mechanism connected to the push rod to adjust the fuel of the carburetor etc. be.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a sectional view showing the main parts of an engine equipped with an embodiment of the governor device according to the present invention, and FIG. 3 is a view taken along the - arrow in FIG.

In this embodiment, the conventional governor device shown in FIG. 1 is abolished.

The differences from the conventional one will be explained.

21 is a balance weight, and a shaft center hole 23 and a square hole 24 are formed in the balance weight 22 on the side opposite to output extraction. The center of the shaft center hole 23 coincides with the rotation center of the balance weight 21.

Reference numeral 25 denotes a weight, which is swingably attached to a bracket 29 by a pin 26. A portion 27 below the pin 26 is wider than an upper portion 28.

A bracket 29 is fixed to the balance weight 22 with a pin 30, and pivotally supports the weight 25 in a swingable manner.

31 is an intermediate rod, which is slidably inserted into the shaft center hole 23. The output extraction side end 32 is a weight 25
It can come into contact with the upper part 28 of. A thrust bearing portion 33 is integrally formed at the end on the recoil starter side, and limits movement of the intermediate rod 31 to the left (in FIG. 2).

A push rod 34 is slidably inserted into a center hole 36 of the recoil starter case 35. A disk 37 that abuts the thrust bearing 33 is removably attached to the output extraction side end. The same disk 37 is the hole 38 of the recoil starter case 35.
It supports a compression spring 39 housed in.

40 is a link mechanism connected to the other end of the push rod 34 and also connected to the recoil starter case 3.
5 and is connected to a throttle lever 44 of a carburetor 43.

The operation in the case of the above configuration will be described.

When the load decreases, the engine rotational speed and the rotational speed of the balance weight 21 increase, and from the state shown in FIG. 2, centrifugal force is increased on the weight 25 as shown by the arrow, causing the intermediate rod 31 to move to the right in FIG. Displace. The push rod 34 also moves to the right against the compression spring 39, rotates the lever 42 counterclockwise, closes the throttle valve (not shown) of the carburetor 43, and reduces the engine speed. .

On the other hand, when the engine speed decreases, the weight 2
5 is also reduced, and the compression spring 39 moves the push rod 34 to the left, which causes the lever 42 to rotate clockwise and open the throttle valve (not shown) of the carburetor 43, opening the engine. Increase rotation speed.

The engine speed is controlled by repeating the above steps.

Note that if the engine is an air-cooled engine, the flywheel can be installed on either the recoil starter side or the output extraction side.

The above case has the following effects.

Since the conventional governor device is eliminated, the dimension from the center of the engine toward the output extraction side becomes extremely small, and the overall engine structure can be simplified.

Since the lubricating oil in the crankcase can be used to lubricate the sliding surfaces of the intermediate rod 31 and the shaft center hole 23, there is no need to consider special lubrication.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional general-purpose engine, FIG. 2 is a sectional view showing the main parts of an engine equipped with an embodiment of the governor device according to the present invention, and FIG.
It is a - arrow direction view of a figure. 21... Balance weight, 25... Weight, 2
9...Bracket, 31...Intermediate rod, 33...
... Thrust bearing section, 34 ... Push rod, 3
9...Compression spring, 40...Link mechanism.

Claims (1)

[Scope of utility model registration request] A recess is provided on the non-output side of the balance weight, a weight is swingably supported in the recess, one end of which abuts the weight, and a thrust bearing is provided at the other end on the recoil starter side to achieve the balance described above. an intermediate rod that is slidable in a shaft hole drilled at the center of rotation of the weight; a push rod that is biased so that one end comes into contact with a thrust bearing portion of the intermediate rod and is slidable within the recoil starter; A governor device for a general-purpose engine, characterized in that it is equipped with a link mechanism connected to the push rod to adjust fuel of a carburetor, etc.