JPH0610721A - Governor device for engine - Google Patents

Abstract

PURPOSE:To obtain the governor device for engine, which can reduce the fluctuation width of the engine speed from the set speed, by expanding the tip of a shifter plate to the slider side for curvature so that the projecting quantity of a slider and the turning quantity of a shifter plate are nearly in proportion with each other. CONSTITUTION:Flare of a governor 5 of a governor gear 3 coupled with a crank shaft 1 is transmitted to a slider 6, and a shifter plate 10 is pushed by the slider 6 to turn a control shaft 9 and open and close a throttle valve of a caburetor, and the engine speed is thereby controlled within a certain range. The tip of the shifter plate 10, which abuts on the spherical surface 7 of the tip of the slider 6 is formed into the circular surface 11 expanded to the slider 6 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a general-purpose engine governor device for use in a small generator or the like that can reduce the rotational speed fluctuation rate.

[0002]

2. Description of the Related Art In a general-purpose engine used for a small generator or the like, as shown in FIG. 4, a gear A fixed to the crankshaft of the engine is interlocked with a governor gear B to rotate the governor gear B. The governor C, which spreads due to the centrifugal force of the engine, is connected to the slider D. When the engine speed is high, the amount of protrusion of the slider D is large. When the engine speed is low, the amount of protrusion of the slider D is small. When the engine speed is high, the shifter plate F is pressed so that the carburetor throttle valve is closed. When the engine speed is low, the carburetor throttle valve is opened so that the engine speed is constant. I try to control within the range.

[0003]

Since the portion of the shifter plate F that contacts the slider D is a flat plate, even if the tip of the slider D is an arc surface G, the slider D
There is a problem that the shift change of the shifter plate F is large with respect to the protrusion, and the fluctuation range with respect to the set engine speed is large.

In view of the above point, the present invention expands the tip portion of the shifter plate toward the slider and bends it.
An object of the present invention is to obtain an engine governor device capable of reducing the fluctuation range of the engine rotation with respect to the set rotation speed by making the amount of protrusion of the slider substantially proportional to the amount of rotation of the shifter plate.

[0005]

In order to achieve the above object, an engine governor device of the present invention transmits a spread of a governor of a governor gear interlocking with a crankshaft to a slider, and controls the shifter plate by the slider. It controls the engine rotation within a certain range by rotating the shaft to open and close the carburetor throttle valve.The tip of the shifter plate, which hits the spherical surface at the tip of the slider, is expanded into a circular arc surface. It has been formed.

[0006]

As the engine speed increases, the spread of the governor increases, the amount of protrusion of the slider increases, and the rotation of the shifter plate increases. Since the spherical surface at the tip of the slider pushes the arc surface of the shifter plate, the contact point between the slider and the shifter plate can be reduced to the side from the center of the slider, and the amount of rotation of the shifter plate can be set to the protrusion amount of the slider. It can be made approximately proportional. As a result, the opening / closing range of the throttle valve of the carburetor that is interlocked with the control shaft of the shifter plate can be reduced, and the fluctuation range of the engine rotation with respect to the set rotation can be reduced.

[0007]

Embodiments of the present invention will be described below with reference to FIGS. A gear 2 is fixed to a crankshaft 1 of the engine, and a governor gear 3 is meshed with the gear 2 to interlock them. The governor gear 3 has a support shaft 4
Then, the governor 5 is axially mounted so as to be spread by the centrifugal force due to rotation, the inner end of the governor 5 is abutted against the inner end of the slider 6, and the slider 6 is pushed out by the governor 5.

The tip of the slider 6 is a spherical surface 7, and the tip of the shifter plate 10 of the control shaft 9 axially attached to the case 8 is the spherical surface 7 of the slider 6.
It is designed to hit And the shifter plate 10
The tip end portion of the slider 6, which is in contact with the slider 6, is formed into an arcuate surface 11 which is expanded toward the slider 6.

A control lever 12 is connected to the outside of the control shaft 9, and is connected to a throttle valve 15 of a carburetor 14 via a rod 13. A governor spring 16 is hooked on the control lever 12 so that the tension of the governor spring 16 and the centrifugal force of the governor 5 are equalized. The tension of the governor spring 16 is adjusted to set the engine rotation speed. Is adjustable.

When the engine load increases, the number of revolutions decreases,
The amount of protrusion of the slider by the governor 5 decreases, the control lever 12 is pulled by the governor spring 16, the throttle valve 15 opens, and the engine speed increases. When the engine load decreases, the number of revolutions increases, the amount of protrusion of the slider 6 by the governor 5 increases, and the throttle lever 15 is closed by the control lever 12.
Reduce the engine speed. In this way, the engine speed is controlled within a fixed range with respect to the set speed. Since the circular arc surface 11 of the shifter plate 10 contacts the spherical surface 7 of the slider 6, the movement amount of the contact point between the slider 6 and the shifter plate 10 can be reduced with respect to the movement amount of the slider 6, and the movement amount of the slider 6 can be reduced. As opposed to
The amount of rotation of the shifter plate 10 is substantially proportional. As a result, the opening / closing amount of the throttle valve 15 is reduced, the fluctuation range of the rotation with respect to the set rotation speed can be reduced, and stable operation can be performed.

[0011]

As described above, since the present invention is configured as described above, by applying the circular arc surface 11 of the shifter plate 10 of the control shaft 9 to the spherical surface 7 at the tip of the slider 6 of the governor 5, The amount of movement of the contact point between the slider 6 and the shifter plate 10 can be reduced, and the amount of rotation of the shifter plate 10 can be made substantially proportional to the amount of movement of the slider 6. As a result, the opening / closing amount of the throttle valve 15 of the carburetor 14 can be set in a small range, the fluctuation range of the engine speed with respect to the set speed can be reduced, and stable operation can be performed. Further, there is no change in the number of parts and the like, and the cost can be increased.
Also, assuming that the fluctuation range of the rotational speed may be the same as the conventional one,
The spring constant of the governor spring 16 can be increased to make it difficult to hunt. Further, the fluctuation rate of the rotation speed can be reduced without reducing the spring constant of the governor spring 16.

[Brief description of drawings]

FIG. 1 is a vertical plan view of a governor portion showing an embodiment of the present invention.

FIG. 2 is a control lever showing an embodiment of the present invention,
It is a top view which shows a carburetor part.

FIG. 3 is a side view showing an embodiment of the present invention with a side case removed.

FIG. 4 is a vertical sectional view of a governor portion showing a conventional example.

[Explanation of symbols]

 1 Crankshaft 2 Governor Gear 5 Governor 6 Slider 7 Spherical surface 9 Control shaft 10 Shifter plate 11 Arc surface 14 Carburetor 15 Throttle valve

Claims (1)

[Claims] 1. The spread of the governor of the governor gear interlocked with the crankshaft is transmitted to the slider, the shifter plate is pushed by the slider to rotate the control shaft to open and close the throttle valve of the carburetor, and the engine rotation is within a certain range. The governor device for an engine is characterized in that the tip portion of the shifter plate, which is in contact with the spherical surface of the tip of the slider, is formed into an arc surface expanded toward the slider.