JPS5840404Y2 - governor sleeve - Google Patents

Description

[Detailed description of the invention] The present invention relates to a governor sleeve that slides forward and backward on a governor sleeve pivot shaft in response to the centrifugal force of the flyweight of the governor, and is relatively lightweight, has high sensitivity, and can be manufactured at low cost. I will provide a.

Conventionally, governor sleeves have been formed by cutting carbon steel for mechanical structures or from sintered alloys, so in order to prevent deformation during machining, the ribs at both ends and the joints that connect them have been cut. is relatively thick and heavy, has low sensitivity, and
It has the disadvantage that the material and processing costs are relatively high because it uses useless meat.

The present invention has been proposed to solve the above-mentioned drawbacks, and the structure and operation of the present invention will be explained below through embodiments shown in the drawings.

Figure 1 is a cross-sectional plan view of a forced air-cooled single-cylinder engine.
Reference numeral 1 indicates a crankcase, 2 indicates a crankshaft, and 3 indicates a camshaft.

Reference numeral 4 designates a flywheel/cooling fan externally fitted and fixed to the front end of the crankshaft 2 on the front side of the crankcase 1.

The crankshaft 2 and the camshaft 3 are interlocked by a pair of small and large gears 5.6 disposed within the crankcase 1.

A flyweight 7 is pivotally supported near the periphery of the front side of a large gear 6 externally fitted and fixed to the front end of the camshaft 3 so as to be able to swing out and swing in the centrifugal direction. The centrifugal force of this weight 7 is used to drive the governor sleeve 8, which is fitted onto the outside, forward.

The governor sleeve 8 is biased in the backward direction by a governor spring (not shown) via a governor fork lever 9.

Reference numeral 10 denotes a pivot shaft of the fork lever 9, which is pivoted to the crankcase 1.

Further, reference numeral 11 is a rotation prevention pin that prevents relative rotation between the large gear 6 and the governor sleeve 8.

Now, as shown in FIG. 2, the governor sleeve 8 is
It is composed of front and rear circular collar portions 12 made of carburized and hardened iron plates, and a connecting cylinder portion 13 made of iron plates that connects both rib portions 12.

A fitting cylinder portion 15 is formed by burring to protrude from the inner peripheral edge of each opposing surface 14 of both collar portions 12 toward the other collar portion 12 .

The connecting cylindrical portion 13 is crimped and welded to both flange portions 12 so as to fit circumscribedly into each fitting cylindrical portion 15 of both flange portions 12 .

FIG. 3 shows a thin plate member 16 forming this connecting cylinder portion 13.
This is a developed view of the member 16, in which a separate contact point 17 that is crushed during welding is formed on each of the front and rear edges of the member 16, and a lubricating oil supply port 18 is provided transparently in the center of the contact point 17.

Each inner peripheral surface 19 of the fitting cylindrical portion 15 of both collar portions 12 is polished to form a sliding contact surface 19 that comes into sliding contact with the outer peripheral surface 20 of the camshaft 3.
The connecting cylinder portion 1 is formed between the front and rear sliding surfaces 19.
An oil groove 21 covered with 3 is formed.

Reference numeral 22 is a flyweight receiving surface, and 23 is a fork lever receiving surface.

In the above embodiment, the connecting cylinder part 13 is formed by cutting a thin-walled pipe to an appropriate length, and is configured to be tightly fitted and fixed to each fitting cylinder part 15 of both collar parts 12. Good too.

As explained above, in the present invention, the governor sleeve 8 can be formed from an iron plate or a thin-walled pipe, so that it can be formed relatively thinly to prevent deformation during cutting or sintering. Compared to governor sleeves, it is thinner and lighter,
Increases sensitivity.

In addition, since iron plates and thin-walled pipes are used, there is almost no need to add waste material, and the material cost is low, and it can be manufactured cheaply and easily by press processing or welding, so the product cost can be kept low.

Further, since the collar portion 12 or the fitting portion 15 that is integral with the flyweight, the governor sleeve pivot shaft 3, the fork lever, etc. is made of a carburized and quenchable iron plate, When the joint 15 is carburized and quenched, the mechanical structural carbon steel is machined and is made to exhibit durability comparable to conventional carburized and quenched materials.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a cross-sectional plan view of a forced air-cooled engine, Fig. 2 is a longitudinal cross-sectional view of the governor sleeve, and Fig. 3 is a thin plate member constituting the connecting cylinder of the governor sleeve. FIG. 3... Governor sleeve pivot shaft, 8...
Governor sleeve, 12...Brim portion, 13...
... Connecting tube, 14... Opposing surface, 15...
...Mating part, 19...Sliding surface (inner peripheral surface), 20
・・・・・・Outer peripheral surface of the governor sleeve pivot shaft.

Claims (1)

[Scope of utility model registration request] The rib portions 12 at both ends of the governor sleeve 80 are formed of a carburized and quenchable iron plate, and the fitting portions 15 protrude from the inner peripheral edge of each opposing surface 14 of both rib portions 12 toward the other rib portion 12. The two flanges are connected by a connecting cylinder 13 which is formed and externally fitted over both liquid joint parts 15, and the sliding surface 19 that slides into contact with the outer circumferential surface 20 of the governor sleeve pivot shaft 3 is connected to the fitting part 1.
The governor sleeve is formed by the inner circumferential surface 19 of No. 5.