JPH023722Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention relates to an improvement of the vibration isolation structure at the connection between the main pipe and the clutch case in order to prevent the engine vibration of a brush cutter from being transmitted to the operator. It is.

<Prior Art> An example of a brush cutter is shown in a perspective view in FIG. 3, and an engine 16 is provided at the rear of the brush cutter to rotate a blade 9 at the tip of a main pipe 8. Since the main pipe 8 is long, the main pipe 8 and its internal transmission shaft are often detachable from the clutch case 6 for convenience during transportation and storage. In such brush cutters, various studies have been conducted on vibration-proofing structures at the connection between the main pipe and the clutch case in order to prevent engine vibrations from being transmitted to the operator. For example, Jitsukai 52
−154434, Utility Publication No. 55-49608, Utility Model No. 1983-
No. 203729 etc. is the structure.

<Problems that the invention aims to solve> These conventional structures are complex and have a large number of parts, require a large number of assembly steps and are expensive, have poor mechanical strength and durability of the connecting parts, and are not easy to connect. It had many problems that needed to be resolved, such as poor anti-vibration performance.

<Means for solving the problem> Therefore, in the present invention, an elastic material 3 of uniform thickness is sandwiched between two collars 1 and 2 of different diameters.
The rear end portion 5 of the main pipe that covers the transmission shaft 14 is press-fitted into the inner periphery of the small diameter collar 2 of the fixed vibration isolator 4, and the outer periphery of the large diameter collar 1 is inserted into the connecting hole provided in the clutch case 6. We have developed a vibration isolator for a brush cutter that has a structure in which the main pipe, which is inserted into the inner periphery of the clutch case and is covered with a vibration isolator 4, is removably fixed to the clutch case.

<Function> The vibration isolating device for a brush cutter having such a structure is firmly held by press-fitting the rear end portion 5 of the main pipe that covers the transmission shaft into the inner circumference of the small diameter collar 2. Clutch case 6
It has the effect of being connected simply by inserting it into the inner periphery of the connecting hole 7 provided in the. With such a simplified structure, it is possible to solve the problems that arise when creating the above-mentioned vibration isolation and removable structure.

<Examples> Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 and FIG. 2 are longitudinal cross-sectional views of essential parts, respectively, showing structural examples of the vibration isolating device of the present invention. A connecting hole 7 for inserting and connecting the rear end portion 5 of the main pipe is provided on the left side of the clutch case 6 as seen in these figures. For the connecting portion, a vibration isolator 4 is used in which an elastic material 3 of uniform thickness is sandwiched and fixed between two collars 1 and 2 in order to exhibit vibration isolation performance. When this vibration isolator 4 is attached to the rear end 5 of the main pipe, no other members or fastening means such as screws are used, so the rear end 5 of the main pipe is press-fitted into the inner circumference of the small diameter collar 2. . In this way, the rear end portion 5 of the main pipe can be attached to and detached from the connecting hole 7 of the clutch case while having the vibration isolator 4, but in the first embodiment, as shown in FIG. The outer periphery of the collar 1 is inserted into the inner periphery of the connection hole 7 provided in the clutch case 6, and the protruding end formed longer than the small diameter collar 2 is abutted against the side of the mounting ring of the bearing 12, and the tightening screw 10 is inserted. Further, for safety, a set screw 11 is screwed into a screw hole passing through the connecting portion to secure it. The structure shown in FIG. 2 is generally the same, but in this example, the two collars 1 and 2 are formed to have the same length, and a step 13 is inserted into the clutch case 6 between the bearing 12 and the connecting hole 7. This is a structure in which the large-diameter collar 1 is brought into contact. When the transmission shaft 14 is inserted and fixed into the connection hole in this way, the transmission shaft 14 is also inserted into the clutch portion 15.
connected to.

<Effects of the invention> By adopting the structure of the present invention detailed above, the following effects were obtained.

When manufacturing a brush cutter, the number of parts is small, the shape is simple, the number of machining steps is small, and the number of assembly steps is also reduced. These things can reduce manufacturing costs.

When transporting or storing, it can be easily separated from the main pipe section, making it easy to transport and does not take up much storage space.

When in use, the main pipe with a cutter can be easily attached, it is lightweight, and engine protection is not transmitted during use, reducing fatigue. The length of the clutch case can be shortened, and the outer diameter of the clutch case can also be adjusted to fit the grip. It is easy to use because it can be made to the same diameter as the outside diameter of the engine and can be gripped close to the engine.

Although it has a small number of parts and is durable, it can be easily separated and repaired in the event that repairs are necessary.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are longitudinal cross-sectional views of essential parts, respectively, showing structural examples of the vibration isolating device of the present invention. FIG. 3 is a perspective view showing an example of a brush cutter. 1...Large diameter collar, 2...Small diameter collar, 3
... Elastic material, 4 ... Vibration isolator, 5 ... Main pipe rear end, 6 ... Clutch case, 7 ... Connection hole,
8... Main pipe, 9... Cutler, 10... Tightening screw, 11... Set screw, 12... Bearing, 13... Step, 14... Transmission shaft, 15... Clutch part, 16... Engine .

Claims (1)

[Scope of utility model registration request] A rear end portion 5 of the main pipe that covers the transmission shaft 14 is attached to the inner periphery of the small diameter collar 2 of the vibration isolator 4, which has an elastic material 3 sandwiched and fixed with a uniform thickness between two collars 1 and 2 of different diameters. At the same time, the outer periphery of the large diameter collar 1 is inserted into the inner periphery of the connection hole 7 provided in the clutch case 6, and the main pipe covered with the vibration isolator 4 is removably fixed to the clutch case. Anti-vibration device for the duster.