JPH0744746Y2 - Vertical engine governor device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a governor device for a vertical engine in which a governor holder is efficiently housed in a narrow space of a crankcase.

[Problems to be Solved by Conventional Techniques and Inventions] Generally, some general-purpose engines are equipped with a governor device that controls the engine speed to a constant value without being affected by load fluctuations. .

In this type of governor device, the flyweight provided on the governor holder that rotates in conjunction with the crankshaft is gradually expanded by the centrifugal force, and the governor shaft is rotated by the pressing force when the flyweight is expanded. The throttle valve is urged in the valve closing direction via the governor lever connected to this governor shaft, and the flyweight and the governor spring that urges the governor lever in the opposite direction are balanced at the urging force. The opening of the throttle valve is controlled to keep the engine speed at a constant value.

By the way, the governor holder is generally one in which a governor driven gear provided in the governor holder is meshed with a cam gear mounted on a cam shaft to obtain a rotational force from the cam gear.

That is, as shown in FIG. 4 (schematic diagram), a cam driven gear 4 axially mounted on a crankshaft 1 is in mesh with a cam driven gear 4 axially mounted on a camshaft 3. A governor driven gear 5, which is integrally formed with a governor holder (not shown), meshes with the governor driven gear 5 by the rotational force of the cam driven gear 4. (Not shown) is expanded, and the governor sleeve 5a connected to this flyweight presses the governor shaft 5b in the direction in which the throttle valve is closed.

However, since the camshaft 3 rotates at half the number of rotations of the crankshaft 1, the gear ratio of the cam driven gear 4 is large, and the governor driven gear 5 protrudes outward. The volume of the crankcase that houses the crankshaft 1, the camshaft 3, etc. becomes large, and the size of the entire engine increases.

In addition, since the cam driven gear 4 is 1/2 rotation of the crankshaft 1, the flyweight has low responsiveness, and it is difficult to quickly respond to a load change.

Further, as disclosed in Japanese Utility Model Laid-Open No. 59-126143, there is a gear in which a cam gear is meshed with an idler gear that transmits the rotational force of the crankshaft to the cam gear. And the entire engine becomes larger.

On the other hand, as shown in FIG. 5 (schematic diagram), a balancer drive gear 7 axially mounted on the crankshaft 1 is provided with balancer shafts 8 arranged on both sides of the crankshaft 1.
The balancer driven gear 9 mounted on the shaft is meshed with a gear ratio of 1: 1, and one of the balancer driven gears 9 is meshed with the governor driven gear 5.

However, since the balancer shaft 8 compensates for the primary inertial force generated in the engine and is arranged in a relatively low portion of the crankcase, in a vertical engine, the balancer driven gear 9 meshes with the balancer driven gear 9. The governor driven gear 5 is easily immersed in the oil O stored in the oil pan (not shown), the oil O is excessively agitated, and the lubricating oil supplied to the drive system is disturbed, or the governor driven gear is used. An unnecessary load may be generated in the rotation of 5, and the governor operation may be hindered.

[Purpose of the Invention] The present invention has been made in view of the above circumstances, and can effectively utilize the narrow space of the crankcase. An object of the present invention is to provide an engine governor device in which the lubricating oil to be supplied is not disturbed unnecessarily.

[Means for Solving Problems] In order to achieve the above object, a governor device for a vertical engine according to the present invention is provided with a balancer drive gear on one side of a crankshaft arranged in a crankcase, A pair of balancer shafts are arranged on both sides in the inner bottom direction of the crankcase, and a balancer driven gear that meshes with the balancer drive gear and rotates in the opposite direction in conjunction with the crankshaft is provided on one side of each balancer shaft. , A governor device is disposed above the oil level of the oil stored in the bottom portion of the crankcase, and a governor drive gear is provided on the side of the one balancer shaft opposite to the balancer driven gear,
A governor driven gear formed on the governor holder of the governor device is meshed with the governor drive gear at a position above the center of rotation of the governor drive gear and at a position not coaxial with the other balancer shaft. .

[Operation] With the above configuration, when the crankshaft rotates, a pair of balancer shafts, each provided with a balancer driven gear that meshes with the balancer drive gear via the balancer drive gear provided on one side of the crankshaft, form the crankshaft. Rotate in the opposite direction. At the same time, the governor drive gear provided on one of the balancer shafts rotates the governor device that forms the governor driven gear in the governor holder via the governor driven gear that meshes with the governor drive gear to operate the governor device.

Therefore, because the governor drive gear that drives the governor driven gear is not shared with the balancer driven gear or the like, but is provided independently, the gear ratio can be set arbitrarily within the narrow crankcase, and the response of the governor operation is improved. In addition, since the position where the governor drive gear and the governor driven gear mesh with each other is located above the center of rotation of the balancer shaft, the engine can be made smaller and the governor holder of the governor device can be located away from the lubricating oil surface. Is set,
Unnecessary stirring of lubricating oil is prevented.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 to 3 show an embodiment of the present invention, FIG. 1 is an enlarged view of a main part of an engine, FIG. 2 is a sectional view taken along line II-II of FIG.
FIG. 3 is a side view of the governor device.

In the figure, reference numeral 11 is a vertical engine body, 12 is a crankcase of the engine body 11, an oil pan 13 is formed in the lower portion of the crankcase 12, and oil O is stored in the oil pan 13.

A crankshaft 14 is supported at approximately the center of the crankcase 12 via a main bearing 15, and a piston (not shown) is connected to the crankshaft 14 via a connecting rod 16. Further, balancer shafts are provided on both sides of the crankshaft 14 described above.
17a and 17b are arranged in parallel, and each balancer shaft 17
A and 17b are rotatably supported by the crankcase 12 via bearings 18, respectively.

As shown in FIG. 2, the balancer drive gear is attached to the crankshaft 14 on one side of the crankcase 12.
The balancer driven gears 20 a and 20 b meshing with the balancer drive gear 19 are mounted on the balancer shaft 1.
The shafts are respectively attached to 7a and 17b.

Reference numeral 21 in FIG. 1 denotes a cam shaft, and a cam driven gear (not shown) of the cam shaft 21 is meshed with a cam drive gear 22 axially attached to the crankshaft 14.

Also, the crankcase 1 of the balancer shaft 17a is
A governor drive gear 23 is pivotally attached to the shaft end portion on the other side of 2. Furthermore, on one side of this governor drive gear 23,
A governor support shaft 24 supported by the crankcase 12 is arranged in parallel with the governor drive gear 23, and a governor holder 25 is mounted on the governor support shaft 24. further,
Attach the governor drive gear to the outer periphery of the governor holder 25.
A governor driven gear 26 that meshes with the balancer shaft 17a at a position above the center C of rotation of the balancer shaft 17a is formed.
The center of rotation C of the balancer shaft 17a is arranged above the oil level of the oil O stored in the oil pan 13.

In addition, the governor support shaft 24 is projected from the governor holder 25, and the governor sleeve 27 is attached to the projected portion.
Has been inserted. In addition, a boss 27a is formed at the base of the governor sleeve 27, and the boss 27a is in contact with the pressing portion 28a of the flyweight 28 which is pivotally supported by the governor holder 25 so as to be expandable by centrifugal force. ing.

Further, the pressure receiving surface 29a of the governor shaft 29 supported by the crankcase 12 is bent into an L-shape and abuts on the tip of the governor sleeve 27. further,
The other end of the governor shaft 29 is projected outward from the crankcase 12, and the base end of the governor lever 30 is pivotally attached to the projected portion.

Further, as shown in FIG. 3, the tip end of the governor lever 30 is continuously connected via a governor rod 32 to a throttle shaft 31b which is fixed to a throttle valve 31a of a carburetor 31 provided in the engine body 11. .

Also, in the middle of the governor lever 30, the governor spring
One end of 33 is hooked, and the other end of this governor spring 33 is connected to a speed control lever 34 supported by the engine body 11.

Next, the operation of the embodiment having the above configuration will be described.

When the engine drives and the crankshaft 14 rotates,
The balancer driven gears 20a and 20b that mesh with the balancer drive gear 19 mounted on the crankshaft 14 respectively.
The balancer shafts 17a, 17b rotate at a constant speed in the opposite direction to the crankshaft 14 via the, and the primary inertia force is compensated.

At the same time, the governor drive gear 23 pivotally mounted on the balancer shaft 17a rotates, and the governor drive gear 23 rotates.
A governor holder 25 integrally having a governor driven gear 26 meshing with 23 rotates while being supported by a governor support shaft 24. Then, the flyweight 28 pivotally supported by the governor holder 25 is subjected to centrifugal force to be expanded, and the pressing portion 28a of the flyweight 28 has a flange 27a of the governor sleeve 27 inserted into the governor support shaft 24. Press.

As a result, the front end of the governor sleeve 27 presses the pressure receiving surface 29a of the governor shaft 29, and the governor lever 30 pivotally mounted on the governor shaft 29 is rotated clockwise in FIG. 3 to move the governor lever 30. The governor lever 30 is stopped at a position balanced with the urging force of the governor spring 33 that urges in the counterclockwise direction, and the tip end of the governor lever 30 is connected to the throttle shaft 31b of the carburetor 31 connected via the governor rod 32. The opening of the fixed throttle valve 31a is controlled, and the engine speed is kept constant.

Further, the governor holder 25 is attached to the crankshaft 14
Since the balancer shaft 17a that rotates at a constant speed is rotated by receiving a rotational force, the responsiveness is better than that of the conventional cam driven gear that takes out the rotation from the cam driven gear (see FIG. 4).

Further, as compared with the conventional one (see FIG. 5) in which rotation is taken out from the balancer driven gear 20a of the balancer shaft 17a, the governor holder is located at a position relatively far from the liquid surface of the oil O stored in the oil pan 13. 25 can be disposed, the oil O is not agitated unnecessarily, the supply of the oil O to the drive system is not disturbed, and the governor holder 25 is immersed in the oil O. Is eliminated, and the responsiveness of the flyweight 28 is improved.

Further, since the governor holder 25 takes out rotation from the governor drive gear 23 pivotally mounted on the balancer shaft 17a, it is necessary to take out rotation from a conventional gear train as shown in FIGS. 4 and 5. On the other hand, the gear ratio between the governor drive gear 23 and the governor driven gear 26 can be set easily, and the response characteristic of the governor can be further improved.

The governor device according to the present invention is a two-cycle engine,
It can also be used in diesel engines.

[Effects of the Invention] As described above, according to the present invention, a governor drive gear is provided on the balancer shaft on the other side of the crankcase, independently of the balancer driven gear, and the governor driven gear formed on the governor holder is provided with a lubricating oil. Since it is located above the plane and above the center of rotation of the balancer shaft in a position that meshes with the governor driven gear, the narrow space of the crankcase can be effectively used, and the engine size is large. There is no change.

In addition, since the governor drive gear that drives the governor driven gear is provided independently, compared with the conventional gear train in which the governor driven gear is meshed,
The gear ratio can be arbitrarily set within the narrow crankcase, and the response of the governor operation can be further enhanced.

In addition, the gear diameter can be easily set, downsizing can be realized, and since the governor holder is arranged at a position apart from the lubricating oil surface, the lubricating oil is not agitated unnecessarily,
Not only is there no disturbance in the supply of the lubricating oil to the drive system, but also the governor holder is not immersed in the lubricating oil and excellent response characteristics can be obtained.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is an enlarged view of a main part of an engine, FIG. 2 is a sectional view taken along line II-II of FIG.
FIG. 3 is a side view of the governor device, and FIGS. 4 and 5 are schematic views of main parts of a conventional example. 12 …… Crankcase, 14 …… Crankshaft, 17a,
17b …… Balancer shaft, 23 …… Governor drive gear, 25 …… Governor holder, 26 …… Governor driven gear,
27 …… Governor sleeve, 28 …… Fly weight, 29 ……
Governor shaft, C ... Center of rotation of the governor shaft.

Claims (1)

[Scope of utility model registration request] 1. A balancer drive gear is provided on one side of a crankshaft provided in a crankcase, and a pair of balancer shafts is provided on both sides of the crankshaft in the bottom direction of the crankcase. A balancer driven gear that meshes with the balancer drive gear and rotates in the opposite direction in conjunction with the crankshaft is provided on one side, and a governor device is provided above the oil level of the oil stored in the inner bottom of the crankcase. A governor drive gear is provided on one side of the balancer shaft opposite to the balancer driven gear. Above the center and on the other balancer shaft Governor of standing type engine, characterized in that is engaged in position on the non-coaxial.