JPH0521U - Clutch housing for brush cutter - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] By making the vibration absorbing elastic body substantially in direct contact with the outer peripheral surface of the operating main rod, the vibration and metal noise generated when the clutch of the brush cutter is switched to the outside. It efficiently suppresses the transmission and reduces the feeling of fatigue and discomfort given to the worker. [Structure] The halved elastic body members 51a and 51b are abutted and attached to the operation main rod 3 so as to wrap around the peripheral surface of the base end of the operation main rod 3 of the brush cutter. Elastic member 51
On the inner peripheral surfaces of a and 51b, recesses 53a and 53b into which the fixing fittings 61a and 61b are fitted are formed. The fixing fittings 61a and 61b are provided with protrusions 62a and 62b, which fit into the holes 3a and 3b formed in the vicinity of the base end portion of the operating main rod 3, on the inner peripheral surface, and are fitted into the recesses 53a and 53b. In this state, the elastic members 51a and 51b are flush with the inner peripheral surfaces. From above, a pair of housing members 71a, 71
By attaching b, the elastic member 51a, 51b
To fix.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a clutch housing for a brush cutter, which absorbs vibrations, impacts, etc. transmitted to a worker through a clutch and facilitates the brush cutting work.

[0002]

[Prior Art]

 The lawn mowers for mowing lawns, pastures, weeds, etc. are roughly classified into those that carry the equipment body on the operator's shoulder and those that move the equipment body on the ground.

For example, in a shoulder type brush cutter, as shown in FIG. 1, a belt 4 for shoulder mounting is attached in the middle of an operating main rod 3 having a rotating blade 1 and an engine 2 attached to the front end and the rear end, respectively. ing. A handle 5 is attached to the operation main rod 3, and an operator 6 operates a brush cutter hung from the shoulder by a belt 4 with the handle 5 to cut grass, grass and the like growing on the ground.

Plants such as lawn, grass, and weeds to be mowed are not constantly growing. The ground on which plants grow is often rugged, and there are obstacles such as standing trees and stone blocks. For this reason, an operation method that often involves turning the engine output on and off from idling to maximum during mowing work is usually adopted. As a result, the worker 6 feels tired due to the vibration transmitted to his / her hand through the operating rod 3. In addition, frequent on / off operations often cause strong metal sounds, which gives the worker 6 anxiety.

Therefore, conventionally, as shown in FIG. 2, a vibration absorber is incorporated in the clutch mechanism to suppress the vibration or the like propagated to the operator's hand through the clutch and the operating main rod. That is, a suspending metal fitting 13 for mounting a shoulder belt is fixed to a part of the operating main rod 3 having a hollow drive shaft housing 11 with a bolt 14. The handle 15 is fixed to the operation main rod 3 with a tightening bolt 17 via a vibration-proof rubber 16.

A drive shaft 20 connected to the engine 2 is installed in the operation main rod 3. An oil-impregnated metal 21 is fitted in the drive shaft 20, and a rotary blade is connected to the end portion on the tip end side through an appropriate gear mechanism (not shown).

The rotation output of the engine 2 is transmitted via the clutch drum 31. As shown in FIG. 3, a boss member 32 is fixed to the clutch drum 31, and the front end of the drive shaft 20 is fitted into the boss member 32. A clutch housing 35 is mounted on the boss member 32 with a retaining ring 33 and a bearing 34 interposed therebetween. The clutch housing 35 is provided with a bolt hole 38 for fixing the outer case 37 with a mounting bolt 36.

In the outer case 37, the vibration absorbing elastic body 40 is arranged around the operation main rod 3 in cooperation with the inner case 39. As the vibration absorbing elastic body 40, an elastic material such as rubber is used. The vibration absorbing elastic body 40 prevents vibrations and impacts on the engine side from being transmitted to the operator's hand through the operation main rod 3.

A relative rotation of the outer case 37 and the inner case 39 with respect to the operation main rod 3 is restricted by a bolt 41. Further, the movement of the inner case 39 and the vibration absorbing elastic body 40 along the axial direction of the operation main rod 3 is restricted by the retaining ring 46 engaging with the end surface of the inner case 39. At the front end of the outer case 37, the inner case 39 is attached to the operation main rod 3 with a tightening bolt 43. The tightening bolts 43 determine the positional relationship between the clutch housing 35 and the cases 37 and 39 with respect to the operating rod 3.

[0010]

[Problems to be solved by the device]

 Since the vibration absorbing elastic body 40 cannot be directly attached to the operation main rod 3, it is fixed on the inner case 39. The outer case 37, the inner case 39, and the vibration absorbing elastic body 40 are each formed with an engaging portion that secures a relative positional relationship with each other.

However, in this method, since the vibration absorbing elastic body 40 is arranged on the peripheral surface of the proximal end portion of the operating main lever 3 via the inner case 39, the operation absorbing rod 40 and the inner case 39 are not connected to the operating main rod 3. There is a limit in reducing the vibration that is transmitted to the operator's hand through the operating main rod 3 due to the occurrence of vibrations.

Further, since the inner case 39 longer than the vibration absorbing elastic body 40 is required, the weight of the clutch housing portion is increased and the operator is burdened. Moreover, since the vibration absorbing elastic body 40 is applied to the operation main rod 3 through the inner case 39, the vibration absorbing elastic body 40 having a large diameter is inevitably required, and the clutch housing 35 itself is also large. Will be the one. Further, since it is necessary to press fit the bearing 34 into the clutch housing 35 and then press fit the vibration absorbing elastic body 40 between the outer case 37 and the inner case 39, the workability during assembly is poor.

The present invention has been devised to solve such a problem, and by making the contact of the vibration absorbing elastic body with the operating main rod as direct as possible, It is an object of the present invention to provide a clutch housing for a brush cutter, which has a smaller diameter, a lighter weight and a simplified mechanism.

[0014]

[Means for Solving the Problems]

 MEANS TO SOLVE THE PROBLEM In order to achieve the objective, the clutch housing for brush cutters of this invention WHEREIN: The vibration absorption elastic body which surrounds the base end peripheral surface of the operation main rod of a brush cutter, and the said vibration absorption elastic body are the said operation main rods. For fixing to the housing mounted on the base end of the operating body and the inner peripheral surface in contact with the outer peripheral surface of the operating main rod and the entire base layer which is fitted into the recess formed on the inner surface of the vibration absorbing elastic body. The housing, the vibration-absorbing elastic body, and the fixing fitting are divided into two parts, and the fixing fitting fixed to the operating main rod and the housing are connected to each other. The vibration absorbing elastic body is fixed.

[0015]

【Example】

 Hereinafter, the present invention will be described in detail with reference to FIGS. 4 and 5. The brush cutter of the present embodiment is provided with an operating main rod 3 having a rotary blade and an engine attached to the front end and the rear end thereof, as in the conventional brush cutter. The fact that the vibration absorbing elastic body and the housing are mounted on the operation main rod 3 is similar to the conventional clutch housing described with reference to FIGS. 2 and 3.

The vibration absorbing elastic body 50 is formed by abutting the side surfaces of the elastic body members 51a and 51b, which are split in two, so as to wrap around the base end peripheral surface of the operating main rod 3. The inner peripheral surfaces 52a, 52b of the elastic body members 51a, 51b are curved with a curvature that matches the outer peripheral surface of the base end portion of the operating main rod 3. Then, recesses 53a, 53b into which the pair of fixing metal fittings 61a, 61b are fitted are formed on a part of the inner peripheral surfaces 52a, 52b. Further, the outer peripheral surfaces of the elastic body members 51a and 51b are curved with a curvature that matches the inner peripheral surfaces of the recesses 72a and 72b formed in the inner surfaces of the pair of housing members 71a and 71b. Grooves 59a, 59b extending in the axial direction are formed in the outer peripheral surfaces of the elastic members 51a, 51b so as to engage with ribs 73a, 73b extending in the axial direction formed on the inner surfaces of the housing members 71a, 71b. The elastic members 51a and 51b are prevented from rotating by fitting the ribs 73a and 73b into the groove portions 59a and 59b. Further, positioning projections 54a and 54b and hole portions 55a and 55b are formed at corresponding positions on the abutting surfaces of the elastic members 51a and 51b.

Protrusions 62a and 62b project inwardly at substantially central portions of the fixing fittings 61a and 61b. The protrusions 62a and 62b are sized to fit into the hole portions 3a and 3b formed near the base end portion of the operating main rod 3. The inner peripheral surfaces 63a, 63b of the fixing fittings 61a, 61b having the protrusions 62a, 62b are formed with the same curvature as that of the outer peripheral surface of the base end portion of the operation main rod 3, and the elastic members 51a, 51b have the same shape. When the fittings 61a and 61b are fitted into the recesses 53a and 53b, the inner peripheral surfaces 52a and 52b of the elastic members 51a and 51b and the inner peripheral surfaces 63a and 63b of the fixing fittings 61a and 61b are flush with each other. Become.

The elastic members 51a and 51b are overlapped with each other so that the fixing fittings 61a and 61b are fitted into the recesses 53a and 53b. Then, with the projections 62a and 62b fitted in the holes 3a and 3b, the fixing metal fittings 61a and 61b are attached to the outer periphery of the base end portion of the operating main rod 3, and the housing members 71a and 51a are attached from above the elastic members 51a and 51b. , 71b, and the housing members 71a, 71b are fastened together with bolts 74 and nuts 75. As a result, the housing members 71a and 71b are integrated.

FIG. 5 shows a clutch housing in which the vibration absorbing elastic body 50 is incorporated in this way. Since the protrusions 62a and 62b are fitted into the holes 3a and 3b formed at the base end portion of the operating main rod 3, the fixing fittings 61a and 61b may be displaced from the operating main rod 3. Absent. Further, the rotation of the fixing fittings 61a, 61b around the protrusions 62a, 62b causes surface contact between the inner peripheral surfaces 63a, 63b of the fixing fittings 61a, 61b and the base end outer peripheral surface of the operating rod 3. The elastic members 51a, 51b are blocked by the wall surfaces of the recesses 53a, 53b.

Since the elastic body members 51a and 51b are mounted on the outer peripheral surface of the base end portion of the operation main rod 3 via the fixing metal fittings 61a and 61b, the elastic body members 51a and 5b are attached to the operation main rod 3. 1b will not be displaced in the axial direction and will not rotate. Further, since the inner peripheral surfaces 52a, 52b of the elastic member 51a, 51b are in direct contact with the outer peripheral surface of the base end portion of the operation main rod 3, the propagation of vibration can be efficiently suppressed.

Further, since the recesses 53a, 53b into which the fixing fittings 51a, 51b are fitted are formed on the inner peripheral surfaces 52a, 52b, the thickness of the fixing fittings 51a, 51b is added to the elastic member 51a, 51b. Instead, the housing members 71a and 71b can have relatively small diameters.

[0022]

As described above, according to the present invention, the outer peripheral surface of the base end portion of the operating main rod is wrapped by the elastic member having a split structure in which the recess into which the fixing fitting is fitted is formed on the inner peripheral surface. Since the elastic body for vibration absorption is provided in this way, the inner peripheral surface of the elastic body directly contacts the outer peripheral surface of the operating main rod, reducing the proportion of efficient vibration absorption and propagation to the operator's hand. Be touched. Therefore, the operator feels little fatigue. Further, since the thickness of the fixing metal fitting is not added to the thickness of the vibration absorbing elastic body, the outer diameter of the clutch housing can be suppressed to a small value, and the brush cutter having excellent operability and handleability can be obtained. However, since it is not necessary to press fit rubber, bearings, etc., it is possible to reduce weight and improve assembly workability.

[Brief description of drawings]

FIG. 1 shows a shoulder type brush cutter.

FIG. 2 is an exploded view of a conventional clutch mechanism incorporated in the operating rod.

FIG. 3 is a sectional view of a conventional clutch mechanism.

FIG. 4 is an exploded view showing a clutch housing according to an embodiment of the present invention.

FIG. 5 is a sectional view of a clutch mechanism including the clutch housing.

[Explanation of symbols]

3 operating rod, 50 vibration absorbing elastic body, 51a,
51b Elastic member, 52a, 52b Inner peripheral surface, 53
a, 53b recesses for mounting the fixing metal fittings 61a, 61b fixing metal fittings, 62a, 62b protrusions,
63a, 63b Inner peripheral surface, 71a, 71b Housing member, 72a, 72b Recessed portion of housing member

Claims (1)

[Claims for utility model registration] [Claim 1] A vibration absorbing elastic body surrounding a peripheral surface of a base end portion of an operating main rod of a brush cutter, and the vibration absorbing elastic body at a base end portion of the operating main rod. A housing to be mounted, and a fixing metal fitting that is fitted into a recess formed on the inner surface of the vibration absorbing elastic body and has an inner peripheral surface in contact with the outer peripheral surface of the operating main rod and a protrusion for fixing to the operating main rod. The housing, the vibration absorbing elastic body and the fixing metal fitting are divided into two parts, and the vibration absorbing elastic material is fixed between the fixing metal fitting fixed to the operation main rod and the housing. A clutch housing for a bush cutter.