JPH0241329Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a speed regulating mechanism for a general-purpose engine equipped with an inclined cylinder.

(Prior Art) General-purpose engines are usually provided with a speed regulating mechanism to maintain the rotational speed of the crankshaft constant even when the load fluctuates. Generally, a speed regulating mechanism has a function of regulating the maximum rotational speed of an engine, and prevents engine troubles caused by overrun and the like.

As is well known, such a speed regulating mechanism includes a governor weight that responds to the crankshaft and is displaced according to its rotational speed, a governor arm that swings when the displacement of the governor weight is transmitted, and a swing of the governor arm. It consists of coupling devices such as coil springs that transmit dynamic displacement to the throttle lever.

(Problems to be solved by this invention) However, in the case of such a conventional general-purpose engine speed governing mechanism, the speed governing mechanism is additionally provided to the general-purpose engine, and each component of the speed governing mechanism Since the placement positions of parts are determined incidentally to the engine's original parts such as the throttle lever, governor weights etc. are placed on the crankcase cover, and couplings etc. are placed around the engine. Something happened. As a result, such general-purpose engines have problems in that the work of attaching and detaching the crankcase cover is complicated and maintenance is difficult.Additionally, covers are required to prevent couplings from interfering with trees, etc. A problem arose in that it was essential and the manufacturing cost increased.

This idea was devised in view of the above-mentioned problems, with the aim of providing a general-purpose engine with improved placement of the components of the speed regulating mechanism, making maintenance easier and reducing manufacturing costs. There is.

(Means for Solving the Problems) This invention consists of a crankcase having an inclined cylinder, a fuel tank provided above the crankcase, and a fuel tank disposed between the fuel tank and the crankcase. a throttle lever for adjusting rotational speed; a crankcase cover provided on one side of the crankcase in the extending direction of the crankshaft; and a cooling lever provided on the other side of the crankcase in the extending direction of the crankshaft. A general-purpose engine equipped with a fan, a shaft extending parallel to the crankshaft inside the crankcase is supported above a wall surface of the cooling fan side of the crankcase, and the shaft is integrated with the crankshaft. A detection member is provided that rotates axially and is displaced in the axial direction according to the rotation speed of the crankshaft, and the other end of the governor lever, one end of which is engaged with the detection member, is rotatable on the upper wall surface of the crankcase. The other end of the governor arm, which has one end fixed to the protruding end of the governor shaft outside the crankcase, is fixed to an end inside the crankcase of a governor shaft that penetrates through and projects upward, and the other end of the governor arm is fixed to the end of the governor shaft that protrudes outside the crankcase. It is characterized in that the throttle lever is connected to the throttle lever by a connector disposed between the throttle lever and the tank.

(Function) According to the speed regulating mechanism for a general-purpose engine according to this invention, a detection member is provided in the upper space on the cooling fan side in the crankcase, which was conventionally a dead space, and a coupling member is connected to the crankcase and fuel. It is also no longer exposed because it is installed between the tank and the tank. Therefore, the space inside the crankcase is used effectively, making it easy to attach and detach the crankcase cover.Furthermore, even if this general-purpose engine is used in a tiller, etc., the coupling will not interfere with trees, etc. Manufacturing costs are reduced because a dedicated cover or the like is not required.

(Example) Hereinafter, an example of this invention will be described based on the drawings.

Figures 1 to 6 show the speed regulating mechanism of a general-purpose engine according to an embodiment of this invention, in which Figure 1 is a plan view of the general-purpose engine, and Figure 2 is a partially cutaway view of the crankcase. 3 is a plan view of a general-purpose engine with a fuel tank attached, FIG. 4 is a partially enlarged plan view, and FIG. 5 is a sectional view taken along arrow 5-5 in FIG. 4. FIG. 6 is a front sectional view of the general-purpose engine.

In the figure, 1 indicates the crankcase of a general-purpose engine, and this crankcase 1 has an inclined cylinder 2.
have. This cylinder 2 has cooling fins 2a on its outer wall, and has a carburetor 3 and an exhaust pipe 4.
is connected. A cooling fan 6 is provided inside a fan cover 5 on the left side of the crankcase 1 in FIG. As shown in FIG. 2, the cooling fan 6 is fixed with a nut 8 to a crankshaft 7 protruding from the crankcase 1 and is driven by the crankshaft 7, taking in air from an air intake port 9 and distributing it near the cylinder 2. Send cooling air 10 to. Note that 11 is a guide plate provided between the fan cover 5 and the cylinder 2 by bolts 31, and this guide plate 11 extends substantially horizontally to guide the cooling air 10 to the cylinder 2.

A crankcase cover 12 is fixed to the other side of the crankcase 1, and a crankshaft 7 protrudes from the crankcase 12 to the right in the figure and is connected to a load (not shown). crankshaft 7
is rotatably supported by the crankcase 1 and crankcase cover 12 via bearings 13, respectively, as shown in FIG. Rotatably connected.

The left crank arm 14 of the crankshaft 7 in FIG.
A drive gear 15 of a speed regulating mechanism that rotates integrally with the crankshaft 7 is provided between the crankcase 1 and the crankcase 1 . This drive gear 15 meshes with a driven gear 16 rotatably supported by a shaft 16a provided on the upper wall of the crankcase 1 at the upper part of the cooling fan 6 side in the crankcase 1, and drives the driven gear 16. do. driven gear 1
6, a weight (sensing member) engaged with the governor lever 18 provided on the governor shaft 19;
17 is provided slidably in the axial direction of the shaft 16a. This weight 17 slides in the axial direction according to the rotational speed of the driven gear 16, that is, the crankshaft 7, presses the governor lever 18, and rotates the governor lever 18 around the governor shaft 19.

As shown in FIG. 1, the governor shaft 19 rotatably penetrates the crankcase 1 and projects upwardly outside the crankcase 1, and a governor arm 20 is fixedly attached to the projecting end outside the crankcase 1. There is. The governor arm 20 has a base end fixedly attached to the above-mentioned governor shaft 19, and a distal end connected to a throttle lever link 22 provided on the carburetor 3 via a governor link 21.
Furthermore, the middle part is the throttle lever spring 2.
3 to the throttle lever 24. These connectors, the throttle lever link 22 and the throttle lever spring 23, are
As shown in FIG. 6, it extends along the crank case 1, and as shown in FIG. It is covered by a fuel tank 25 and an air cleaner 26 attached to the case 1.

As shown in FIGS. 4 to 6, the throttle lever 24 has a proximal end located at the bulged portion 11a of the guide plate 11.
It is pivotally connected to a center shaft 27 implanted in the center shaft 27, has an operating portion 24a at its tip, and further has an engaging portion 24B connected to an end of the throttle lever spring 23 at its intermediate portion. The center shaft 27 passes through the hole 11b of the guide plate 11 and the hole 24c of the throttle lever 24, and is inserted into the guide plate 11.
The guide plate 11 is fastened to the guide plate 11 with a nut 30 that protrudes upward and is screwed onto the upper part. Note that 28 is a friction washer interposed between the guide plate 11 and the throttle lever 24, and 29 is a presser washer interposed between the throttle lever 24 and the nut 30.

In the speed regulating mechanism of such a general-purpose engine, the weight 17 is moved to the shaft 16a according to the rotational speed of the crankshaft 7.
The governor lever 18 is rotated together with the governor shaft 19 by sliding on the top and pressing the governor lever 18 . Therefore, the governor arm 20 swings around the governor shaft 19 at the base end, and drives the throttle lever 24 via the throttle lever spring 23. As a result, the throttle lever 24 is rotated in accordance with the rotational speed of the crankshaft 7, and in the general-purpose engine, the rotational speed of the crankshaft 7 is maintained constant even if the load fluctuates.

On the other hand, in the speed regulating mechanism of this general-purpose engine, each component of the speed regulating mechanism is disposed in a space between the upper wall of the crankcase 1, the fuel tank 25, and the air cleaner 26. That is, the governor arm 20,
The throttle lever link 21, throttle lever link 22, throttle lever spring 23, throttle lever 24, etc. are disposed in a space whose upper part is covered by the fuel tank 25 and are not exposed. Therefore, even if this general-purpose engine is used in a tiller used outdoors, the components of the speed regulating mechanism will not interfere with tree branches or the like.
In the speed governing mechanism of this general-purpose engine, each component of the speed governing mechanism is protected by existing parts such as the fuel tank 25, so there is no need to provide special parts, and manufacturing costs do not increase.

Furthermore, in the speed regulating mechanism of this general-purpose engine, the weight 17 and the like are arranged in a space above the cooling fan 6 side in the crankcase 1, that is, in a conventional dead space. Therefore, the weight 17 and the like can be stored without affecting the attachment and detachment of the crankcase cover 12 and without increasing the size of the engine, making maintenance easier.

In the embodiment described above, the throttle lever 24 is supported on the guide plate 11 in order to eliminate the thermal influence on the throttle lever 24, but if the thermal influence can be ignored, the throttle lever 24 can be supported as before. 24 may be supported directly on the cylinder 2.

(Effects of the invention) As explained above, according to the general-purpose engine speed governing mechanism according to this invention, the rotational speed detection member such as the governor weight is moved to the cooling fan side in the crankcase, which is a conventional dead space. In addition to storing a series of components, from the governor weight to the throttle lever, in the space above the fuel tank, the space inside the crankcase can be used effectively and maintenance is easy. Furthermore, it is possible to prevent the component parts from interfering with trees or the like.

[Brief explanation of the drawing]

1 to 6 show the speed regulating mechanism of a general-purpose engine according to an embodiment of this invention, FIG. 1 is a plan view of the general-purpose engine, FIG. 2 is a partially cutaway plan view of the general-purpose engine, Figure 3 is a plan view of the general-purpose engine with the fuel tank attached, Figure 4 is an enlarged plan view of the main parts, Figure 5 is a sectional view taken along arrow 5-5 in Figure 4, and Figure 6 is the front view of the general-purpose engine. FIG. In the drawing, 1 is the crankcase, 2 is the cylinder,
6 is a cooling fan, 7 is a crankshaft, 11 is a guide plate, 16a is a shaft, 17 is a weight (detection member),
18 is a governor lever, 19 is a governor shaft, 20 is a governor arm, 21 is a governor link, 22 is a throttle lever link (connection tool),
23 is a throttle lever spring (connection tool),
24 is the throttle lever, 25 is the fuel tank, 2
6 is an air cleaner.

Claims (1)

[Claims for Utility Model Registration] A crankcase equipped with an inclined cylinder;
a fuel tank provided above the crankcase; a throttle lever for adjusting rotational speed disposed between the fuel tank and the crankcase; In a general-purpose engine including a crankcase cover provided on the crankcase and a cooling fan provided on the other side of the crankcase in the direction in which the crankshaft extends, the crankcase is mounted above a wall surface on the side of the cooling fan of the crankcase. A shaft extending parallel to the crankshaft is supported inside the case, and a detection member that rotates integrally with the crankshaft and is displaced in the axial direction according to the rotational speed of the crankshaft is provided on the shaft, The other end of the governor lever, one end of which is engaged with the detection member,
A governor arm is fixed to an end inside the crankcase of a governor shaft that rotatably penetrates an upper wall surface of the crankcase and projects upward, and one end of the governor arm is fixed to a protruding end of the governor shaft outside the crankcase. A speed regulating mechanism for a general-purpose engine, characterized in that the other end is connected to the throttle lever by a connector disposed between the crankcase and the fuel tank.