JP3306882B2 - Governor device for general-purpose engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a governor device for a general-purpose engine for controlling the rotation speed of a crankshaft to be constant.

[0002]

2. Description of the Related Art A general-purpose engine is provided with a governor device that keeps the rotation speed of a crankshaft constant regardless of the load. In this governor device, the throttle valve of the carburetor is linked to the governor lever that rotates according to the rotation speed of the crankshaft.When the load on the general-purpose engine increases and the rotation speed of the crankshaft decreases, the throttle valve opens. When the load decreases and the crankshaft speed increases,
Close the throttle valve and reduce the rotation speed.

A lever rotating mechanism for rotating and displacing a governor lever is generally installed in a crankcase because it is directly driven by a crankshaft, and a return shaft for rotating the governor lever projects from the crankcase. Is fixed.

[0004] The governor lever and the throttle valve are connected by a governor rod, and the governor lever is spring-biased by a governor spring in a direction in which the throttle valve is fully opened. Therefore, the governor lever rotates to a position where the force from the lever rotating mechanism and the spring biasing force of the governor spring balance, and keeps the crankshaft rotation speed of the general-purpose engine constant.

On the other hand, a solenoid valve is connected to the governor lever. The solenoid valve operates the governor lever so that the throttle valve closes when the general-purpose engine is not loaded, and puts the general-purpose engine in an idling state, thereby reducing engine noise and saving fuel.

[0006]

However, in the governor device of the conventional general-purpose engine, the return shaft serving as the rotation shaft of the governor lever is supported near the crankshaft. And the general-purpose engine could break down. In order to prevent this, it is necessary to provide a stopper for restricting rotation of the return shaft in the crankcase, which complicates the shape of the crankcase.

Conventionally, since the lever rotating mechanism is provided at a deep portion of the crankcase, maintenance such as disassembly and assembly of the lever rotating mechanism is extremely difficult, and other devices in the crankcase are not easily operated. However, the layout was restricted by the lever rotation mechanism, making it difficult to design a general-purpose engine.

In addition, the governor lever directly connected to the lever rotating mechanism is located deep between the crankcase and the fuel tank disposed thereon, and the fuel tank is removed for adjustment or repair. It was necessary and required a long time for maintenance work.

Further, in the conventional governor device, the solenoid valve, the governor rod, the governor spring, and the like are exposed to the outside, so that smooth operation can be prevented or failure can be prevented due to contact of foreign matter, dust, or moisture. There was a fear of doing.

The present invention has been made in order to solve these problems, and does not complicate the shape of the crankcase, is excellent in maintainability and design, and avoids contact with foreign matter. An object of the present invention is to provide a governor device for a general-purpose engine that can prevent malfunction and can operate smoothly.

[0011]

In order to achieve the above object, a governor device for a general-purpose engine according to the present invention is provided with a detachable lid on a side of a crankcase and extends between the crankcase and the lid. A crankshaft of a general-purpose engine is supported, and a throttle valve is interlocked according to the rotation speed of the crankshaft, and a governor lever that keeps the rotation speed of the crankshaft constant regardless of the magnitude of the load, and this governor lever to the crankcase A governor device for a general-purpose engine, comprising: a lever rotation mechanism for rotating and displacing around a pivotally supported return shaft; and a solenoid valve for operating a governor lever to an idling position when no load is applied to the general-purpose engine. , The upper corner closest to the lid inside the space between the crankcase and the lid The cover is attached to the inner surface of the lid so as to be positioned at the portion, and the lever rotating mechanism is configured to be able to be taken out of the crankcase in conjunction with the removal of the lid, and the return shaft is rotated by the rotating shaft of the lever rotating mechanism. This is disposed on the opposite side of the crankshaft with respect to the governor shaft.

A solenoid valve is installed between main components of the general-purpose engine, and is located outside the plane contour of the general-purpose engine, and the operating part of the solenoid valve is directed toward the center of the general-purpose engine.

Further, a governor rod for connecting the governor lever to the throttle valve and a governor spring for biasing the governor lever in a direction to open the throttle valve are disposed between main components of the general-purpose engine.

[0014]

With this construction of the governor device for a general-purpose engine, the lever rotating mechanism is attached to the inner surface of the crankcase lid, and the lever rotating mechanism is removed from the crankcase in conjunction with the removal of the lid. Since the configuration is made possible, the lever rotating mechanism can be taken out of the crankcase at the same time when the lid is removed, and the maintenance property involving disassembly and assembly of the lever rotating mechanism is significantly improved.

In addition, since the lever turning mechanism is located at the uppermost corner near the cover inside the space formed by the crankcase and the cover, the layout of the equipment is not limited to the lever turning mechanism. Restrictions are reduced, and the design of a general-purpose engine is improved.

Further, since the return shaft is arranged at a position away from the crankshaft, there is no possibility that the return shaft collides with the crankshaft, and therefore, it is not necessary to provide a stopper for restricting the rotation of the return shaft in the crankcase. In addition, the crankcase can be prevented from becoming complicated in shape.

Further, not only the lever rotating mechanism but also the governor lever and the solenoid valve can be easily accessed. In this respect, the maintainability is improved. In addition, the operating part of the solenoid valve, the governor rod, and the governor spring are not affected. Are less likely to come into contact with each other, thereby preventing failure and smoothing operation.

[0018]

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

FIG. 1 is a right side view of a general-purpose engine 1 provided with a governor device according to the present invention, FIG. 2 is a plan sectional view showing an internal structure of a crankcase of the general-purpose engine, and FIG. FIG. 4 is a plan view of a general-purpose engine showing an example, and FIG.

The general-purpose engine 1 is, for example, a single-cylinder four-stroke OHV type engine. Its main components are a crankcase 2, a cylinder assembly 3 and a carburetor 4 installed diagonally upward at the front of the crankcase 2. , A fan cover 5 and a recoil starter housing 6 mounted on the left side surface of the crankcase 2, a fuel tank 7 mounted above the crankcase 2 and the fan cover 5, a fan cover 5 and a fuel tank 7
And an air cleaner 8 connected to the carburetor 4 and an exhaust muffler 9 mounted above the cylinder assembly 3.

A crankshaft 11 extending in the left-right direction in the crankcase 2 includes a crankcase 2 and a lid 12 detachably provided on a right side surface of the crankcase 2.
And one end thereof protrudes from the lid 12, and a working machine such as a generator or a pump is connected to the protruding portion to receive the power of the general-purpose engine 1. And lid part 1
The maintenance inside the crankcase 2 can be performed by removing the crankcase 2.

The governor device 13 for keeping the rotation speed of the crankshaft 2 constant during the operation of the general-purpose engine 1 includes a governor lever 14 disposed between the crankcase 2 and the fuel tank 7 and a solenoid valve 15.
And a lever rotating mechanism 1 disposed in a crankcase 2
6, a return shaft 17 rotatably supported so as to penetrate the upper surface of the crankcase 2 in the vertical direction, and a governor rod 19 and a governor spring 21 which will be described later.

The upper end of the return shaft 17 protrudes upward from the upper surface of the crankcase 2, and a governor lever 14 is fixed to the protruding portion so as to rotate integrally therewith. The governor lever 14 is rotatable about the return shaft 17 as a rotation axis. A governor rod 19 connects the tip of the governor lever 14 and the throttle valve 18 of the carburetor 4. A governor spring 21 is provided at the tip of the governor lever 14.
The other end of the governor spring 21 is hooked on a rotation speed setting lever 22 rotatably provided on the cylinder assembly 3 or the like, and the governor spring 21 moves in a direction to open the throttle valve 18. The governor lever 14 is biased.

The lever rotation mechanism 16 is provided for the crankcase 2.
It is attached to the inner surface of the lid 12 so as to be located at the uppermost corner near the lid 12 in the space defined by the cover 12 and fixed to the lid 12 so as to be parallel to the crankshaft 11. A governor shaft 23, a cup-shaped governor gear 24 rotatable around the governor shaft 23, a weight lever 25 pivotally supported in the governor gear 24 and swinging in a centrifugal direction, and the governor shaft 23.
And a slider 26 which is slidable along. The governor gear 24 meshes with the fixed gear 27 of the crankshaft 11, while the return shaft 17 is disposed on the opposite side of the crankshaft 11 with the governor shaft 23 interposed therebetween. Are in contact with the slider 26.

The rotation speed of the general-purpose engine 1 is set by operating the rotation speed setting lever 22 to determine the opening of the throttle valve 18 and fixing the rotation speed setting lever 22 with a thumb screw 28 or the like.

When the general-purpose engine 1 is operated, the load applied to the crankshaft 11 decreases, and the crankshaft 11
When the rotation speed of the weight lever 25 rises above the set speed, the weight lever 25 in the governor gear 24 rotates in the centrifugal direction as shown in FIG. 5, the arm 25a of the weight lever 25 presses the slider 26, and the slider 26 17
Is rotated, and the governor lever 14 is moved to the throttle valve 18.
In the closing direction A to decrease the rotation speed of the general-purpose engine 1.

Conversely, when the load increases and the rotational speed of the crankshaft 11 falls below the set speed, the centrifugal force applied to the weight lever 25 decreases, and the weight lever 2
5 returns to the governor shaft 23 side, and the governor lever 14 rotates in the direction B to open the throttle valve 18 to increase the rotation speed of the general-purpose engine 1.

In this way, the rotation speed of the general-purpose engine 1 is kept constant regardless of the magnitude of the load. On the other hand, the solenoid valve 15 is fixed to the general-purpose engine 1, and its operating portion 15 a is connected to an intermediate portion of the governor lever 14. When no load is applied during operation of the general-purpose engine 1, the solenoid valve 15 electrically detects, for example, this no-load state, pulls the governor lever 14 against the force of the governor spring 21, and operates the throttle valve 18. The general-purpose engine 1 is brought into an idling state by being closed to reduce engine noise and save fuel.

In the present invention, as described above, the governor 13
The lever rotating mechanism 16 is mounted on the inner surface of the lid 12 so as to be located at the uppermost corner near the lid 12 in the space formed by the crankcase 2 and the lid 12. Also,
Return shaft 17 serving as a rotation axis of governor lever 14
Are disposed on the opposite side of the crankshaft 11 with respect to the installation position of the governor shaft 23 serving as the rotation axis of the lever rotation mechanism 16.

In this manner, since the lever rotating mechanism 16 can be taken out of the crankcase 2 at the same time when the lid 12 is removed from the crankcase 2, maintenance such as disassembly and assembly of the lever rotating mechanism 16 is required. Can be easily performed, and the maintainability can be significantly improved. In addition, the lever rotating mechanism 1 located at the upper corner of the crankcase 2 closest to the lid 12
6, it is difficult to restrict the layout of other devices installed in the crankcase 2, so that the design of the general-purpose engine 1 can be improved.

Further, no matter how the return shaft 17 rotates, there is no danger of collision with the crankshaft 11. Therefore, it is not necessary to provide a stopper or the like for restricting rotation in the crankcase 2. Shape complication can be prevented.

Further, since the return shaft 17 is located at the corner of the upper surface of the crankcase 2, the governor lever 14 fixed here is located at a position easily accessible from the central part of the general-purpose engine 1, There is no need to remove the fuel tank 7 when adjusting or repairing the governor lever 14.

Further, in the present invention, the solenoid valve 15
Is installed between the crankcase 2 and the fuel tank 7, which are main components of the general-purpose engine 1, and positioned outside the plane outline of the general-purpose engine 1, and the operating part 15 a of the solenoid valve 15 is connected to the general-purpose engine 1. Facing the center.

As a result, the solenoid valve 15 is located in an easily accessible location like the governor lever 14 but is not exposed to the outside, so that the operating portion 15a comes into contact with foreign matter or dust or moisture, etc. It can operate smoothly without the risk of adhering.

The governor rod 19 and the governor spring 21 are disposed between the fan cover 5, which is a main component of the general-purpose engine 1, the fuel tank 7, and the air cleaner 8, so that failure due to contact with foreign matter is prevented. And
Works smoothly.

According to the governor device 13 configured as described above, the shape of the crankcase 2 is kept simple, which contributes to weight reduction and cost reduction of the general-purpose engine 1.
The maintainability of each part can be improved, and the number of failures can be reduced, so that the reliability of the general-purpose engine 1 can be improved.

[0037]

As described above, in the governor device for a general-purpose engine according to the present invention, a removable lid is provided on the side of the crankcase, and the crankshaft is supported between the crankcase and the lid. A governor lever that keeps the rotation speed of the crankshaft constant regardless of the load, and a governor lever that interlocks a throttle valve in accordance with the rotation speed of the crankshaft. In a governor device for a general-purpose engine including a lever rotating mechanism for rotating and displacing around a return shaft and a solenoid valve for operating a governor lever to an idling position when no load is applied to the general-purpose engine, the lever rotating mechanism includes a crankcase. So that it is located at the upper corner of the space between the lid and the lid Attached to the inner surface of the section, the lever rotation mechanism is configured to be removable from the crankcase in conjunction with the removal of the lid, and the return shaft is cranked with a governor shaft serving as the rotation axis of the lever rotation mechanism interposed therebetween. It is characterized by being arranged on the opposite side of the shaft.

Therefore, the lever rotation mechanism can be easily removed from the inside of the crankcase to improve the maintainability, and at the same time, the layout restriction on other devices by the lever rotation mechanism is reduced to design a general-purpose engine. Performance can be improved. Further, since there is no fear that the return shaft collides with the crankshaft, it is not necessary to provide a stopper for restricting rotation of the return shaft in the crankcase, and the structure of the crankcase can be simplified. In addition, since the return shaft is located at the corner of the upper surface of the crankcase, the governor lever fixed thereto is easily accessible, and adjustment and repair are easy.

Also, since the solenoid valve is installed between the main components of the general-purpose engine and located outside the plane outline of the general-purpose engine, and the operating part of the solenoid valve is directed to the center of the general-purpose engine, The attachment and detachment and adjustment of the valve are easy, and the operation part of the solenoid valve is protected from contact with foreign matter, adhesion of dust and moisture, and smooth operation can be performed.

Further, since a governor rod for connecting the governor lever and the throttle valve and a governor spring for biasing the governor lever in a direction to open the throttle valve are disposed between the main components of the general-purpose engine, contact with foreign matter may occur. Failure can be prevented and the reliability of the general-purpose engine can be improved.

[Brief description of the drawings]

FIG. 1 is a right side view of a general-purpose engine provided with a governor device according to the present invention.

FIG. 2 is a plan sectional view showing the internal structure of a crankcase of a general-purpose engine.

FIG. 3 is a plan view of a general-purpose engine showing one embodiment of the present invention.

FIG. 4 is a view taken in the direction of the arrow IV in FIG. 1;

FIG. 5 is a diagram showing the operation of the governor device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 General-purpose engine 2 Crankcase 4 Carburetor 5 Fan cover 7 Fuel tank 8 Air cleaner 9 Exhaust muffler 11 Crankshaft 12 Crankcase lid 13 Governor device 14 Governor lever 15 Solenoid valve 15a Solenoid valve operation part 16 Lever rotation mechanism 17 Return shaft Reference Signs List 18 throttle valve 19 governor rod 21 governor spring 22 rotation speed setting lever 23 governor shaft 28 thumb screw

Claims (3)

(57) [Claims] A removable lid is provided on a side portion of a crankcase, a crankshaft of a general-purpose engine is supported between the crankcase and the lid, and a throttle valve is operated in accordance with a rotation speed of the crankshaft. A governor lever that keeps the rotation speed of the crankshaft constant regardless of the magnitude of the load, a lever rotation mechanism that rotates this governor lever around a return shaft that is pivotally supported by the crankcase, and a general-purpose engine. In a governor device for a general-purpose engine having a solenoid valve for operating a governor lever to an idling position at the time of load, the lever rotating mechanism may be configured such that the upper corner portion of the space formed by the crankcase and the lid is closest to the lid. Attached to the inner surface of the lid so that the lever is turned in conjunction with the removal of the lid. A governor device for a general-purpose engine, wherein the moving mechanism is configured to be removable from a crankcase, and the return shaft is disposed on the opposite side of the crankshaft with respect to a governor shaft serving as a rotating shaft of a lever rotating mechanism. . 2. The solenoid valve is installed between main components of a general-purpose engine, and is located outside a plane contour of the general-purpose engine, and an operating part of the solenoid valve is directed toward a center of the general-purpose engine. The governor device for a general-purpose engine according to claim 1. 3. The general-purpose engine according to claim 1, wherein a governor rod connecting the governor lever and the throttle valve and a governor spring for biasing the governor lever in a direction to open the throttle valve are disposed between main components of the general-purpose engine. The governor device for the described general purpose engine.