JPH0342262Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a spring rest device for a centrifugal clutch that can support a tension spring that expands and contracts when the clutch is operated so as to prevent it from swinging.

[Prior Art] Conventionally, as seen in Japanese Utility Model Publication No. 53-1471, etc., a centrifugal clutch has been used in which a tension spring is connected between two arc-shaped shoes each having one end pivoted on the opposite side of the center of rotation. When the centrifugal clutch is activated, the tension spring expands and contracts while rotating, applying extra force and vibrating in the left-right direction.

[Problems to be Solved by the Invention] Therefore, there was a problem in that the tension spring vibrated and was damaged.

[Means for solving the problem] The present invention solves the problem and prevents the tension spring from swinging.For this purpose, both shoes are provided with corresponding inner surfaces at the pivot side bases of both shoes. The stoppers are each fixedly installed, and the outer circumferential surfaces of both stoppers are formed into curved surfaces that can approach both sides of the intermediate portion of the tension spring.

[Operation] Therefore, when the centrifugal clutch operates and both shoes rotate around the fulcrum at one end, the tension spring changes direction and expands during that time, but it does not rotate together with both shoes. The curved outer circumferential surfaces of both stoppers, which are in a state of This will help prevent this.

[Example] Next, the embodiment shown in the drawings will be described.

FIG. 4 shows a cross-sectional view of a part of the brush cutter. The rear end of the operating rod 7, which has a cutting blade connected to the front end, is connected to the front end of the clutch case 6, which is connected to the engine. A drive shaft 10 extends from a boss 9 of a drum 8 mounted in the case 6 to the inside of the operating rod 7, and a shoe is attached to the tip of a rotating shaft 11 extending from the engine side into the clutch case 6. The center part of the body 12 is fitted and fixed, and arc-shaped shoes 1a are provided at both ends of the shoe attachment body 12, which is located on the opposite side of the rotation center 0, which is the axis of the rotation shaft 11. , 1b are one end side of the pivot side bases 3a, 3b.
Bolts 14a, 14b are inserted into the holes 13, 13 and pivotally connected, respectively, and linings 15a, 14b are attached to the outer circumferential side.
Both ends of the tension spring 2 are connected to hook holes 16, 16 formed at the center of the inner periphery of both shoes 1a, 1b having 15b, respectively, so that the structure is similar to the conventional structure.

Pivot side bases 3a, 3 of both shoes 1a, 1b
Both stoppers 4 are provided on the corresponding inner surface of b.
a and 4b are fixed respectively, but both stoppers 4
The inner peripheral surfaces of a and 4b are formed into curved surfaces so that they can be joined to the curved inner surfaces of the bases 3a and 3b,
The outer peripheral surfaces 5a, 5b of both stoppers 4a, 4b are as follows:
It is formed into a curved surface that increases in diameter from one end side to the other end side so that it can approach both sides of the middle part of the tension spring 2, and three screw holes 17a are provided at intervals on the inner side surfaces of both bases 3a and 3b. ,1
7b, and screws 18a, 18b inserted into both stoppers 4a, 4b are inserted into each screw hole 17a, 17b.
The stoppers 4a and 4b are fixed by screwing into the respective screws so as to be movable and adjustable.

Therefore, when the centrifugal clutch operates and both shoes 1a and 1b rotate around the bolts 14a and 14b, respectively, the tension spring 2 between them changes direction on the rotation center 0 and vibrates in the left-right direction. However, the curved outer circumferential surfaces 5a, 5b of both stoppers 4a, 4b, which rotate together with the shoes 1a, 1b, exert a tensile action on both sides of the intermediate portion of the tension spring 2, where the tension direction changes. This means that the tension springs 2 are in good contact with each other on the curved surfaces so as not to be disturbed, and it is possible to effectively prevent the tension spring 2 from vibrating in the left-right direction.

As shown in FIG. 3, the degree of contact with the tension spring 2 can be adjusted by inserting the screw 18a into the other screw hole 17a and moving the stopper 4a.

[Effects of the invention] As described above, the present invention provides both stoppers 4a and 4b that rotate together with both shoes 1a and 1b when the centrifugal clutch operates and the tension spring 2 expands while changing its direction on the rotation center 0. The curved outer circumferential surfaces 5a and 5b of are in good contact with both sides of the intermediate portion of the tension spring 2 whose tension direction changes so that the tension action of the tension spring 2 is not inhibited, and the tension spring 2 is moved in the left-right direction. This means that the tension spring 2 can be effectively prevented from vibrating, and the tension spring 2 can be prevented from being damaged as in the conventional case.Also, since the tension spring 2 does not vibrate, its tensile force is also stable, making it easier to start. It also stabilizes the meeting at the start of contact with the drum, etc., further improves clutch performance, and has the advantage of being of a simple structure and suitable for implementation.

[Brief explanation of drawings]

Figure 1 is a side view of the main parts of an embodiment of the present invention;
FIG. 2 is an enlarged view of a part of the brush cutter, FIG. 3 is an explanatory diagram of a changed state of the stopper mounting position shown in the part of FIG. 2, and FIG. 4 is a sectional view of a part of the brush cutter. 0... Center of rotation, 1a, 1b... Shu, 2...
...Tension spring, 3a, 3b...Base, 4
a, 4b... stopper, 5a, 5b... outer peripheral surface.

Claims (1)

[Scope of utility model registration request] In a centrifugal clutch in which a tension spring 2 is connected between two arc-shaped shoes 1a and 1b, each having one end pivoted on the opposite side of the rotation center 0, the correspondence between the pivot side bases 3a and 3b of both shoes 1a and 1b Both stoppers 4a, 4b are fixedly installed on the inner surface of the
The outer peripheral surfaces 5a, 5b of b are connected to the tension spring 2
A spring steady rest device characterized in that it is formed into a curved surface that can be approached on both sides of the intermediate portion of the spring.