JPS6036017Y2 - Anti-vibration support device for brush cutters - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibration-proof support structure for a brush cutter, and particularly to a vibration-proof support structure between an operating rod and a clutch case.

Some common brush cutters have a cutting blade attached to the distal end of an operating lever that includes a transmission shaft via a gear case, and a prime mover attached to the base end of the operating lever via a clutch case.

In this type of brush cutter, a vibration-proofing structure is applied to the support between the operating rod and the clutch case to prevent vibrations from the prime mover from directly propagating to the operating rod.

In addition, some types of brush cutters have a U-shaped handle attached to the operating rod in a direction that intersects with the operating rod, and are operated by grasping the grips provided at both ends of the handle. There are two types: one is equipped with a grip, and the other is a handle with a grip that protrudes from the operating rod in place of the front grip, so that the operator can directly hold the operating rod and operate it. .

In the former type, the operating rod is rotatably supported on the clutch case, and is generally equipped with a prime mover having a float cab (hereinafter referred to as a float cab type brush cutter), while in the latter type, it is generally fixed and supported,
It is common to be equipped with a prime mover having a diaphragm cab (hereinafter referred to as a diaphragm cab type brush cutter).

Therefore, two types of vibration isolation structures between the clutch case and the operating rod are required, and different types have been prepared for each.

For this reason, when manufacturing both types of brush cutters, there is a problem that the number of parts increases and the manufacturing cost also increases.

Therefore, the present invention has a vibration-proof structure between the clutch case and the operating rod that can be used for both float type and diaphragm type, which reduces manufacturing costs and reduces the number of parts. The present invention provides a vibration-proof support structure for a brush cutter that provides a vibration-proofing effect.

Embodiments of the present invention will be described below with reference to the drawings.

In Figures 1, 2 and 4, reference numeral 1 denotes a hollow and long operating rod with a transmission shaft 8 inside. A cutting blade 3 is attached to the protruding output shaft 2a, and a safety cover 4 that covers the rear upper surface of the cutting blade 3 is attached to the lower part of the operating rod 1.

On the other hand, the base end of the operating rod 1 is rotatably attached to a clutch case 5, and a prime mover 6 is attached to the clutch case 5.

The clutch case 5 includes a mounting seat 5a protruding along the axial direction from the upper circumferential surface of the tip thereof, a flange 5b protruding from the circumferential surface of the end on the motor 6 side, and a clutch housing 5C.
It has a locking wall 5d and a fitting hole 5e.

A centrifugal clutch mechanism 7 (not shown) is accommodated in the clutch housing 5C, and its clutch tom 7a is connected to the boss body 7.
It is spline-fitted to the transmission shaft 8 via b.

A bundle 10 (a bundle 101 having a U-shape in front view) is attached to the middle part of the operating rod 1 via a bundle attachment fitting 9 with anti-vibration measures, and grips 11 are attached to both ends of the bundle 101. , a throttle lever 12 is attached close to one grip 11.

The hanging fitting 1 is attached to the mounting seat 5a by bolts 14 and 14.
3 (plate-shaped hanging fitting 131) is attached, and this plate-shaped hanging fitting 131 has a plurality of locking holes 131a (three in the drawing) for locking hooks of a hanging band (not shown).

A stand 15 is provided at the lower part of the outer periphery of the clutch case 5.

The brush cutter of this embodiment is of a float cab type in which the prime mover 6 has a float cab.

The brush cutter shown in Figs. 1, 3 and 5 to 9 has a prime mover 6.
This is a diaphragm cab type using a diaphragm cab, and parts common to those of the previous embodiment are given the same reference numerals and explanations thereof will be omitted.

In this embodiment, as shown in FIGS. 3 and 5, the bundle 10 has one end attached to the mounting bracket 9, and the other end attached to the one end support handle 102 bent laterally, and the grip 11 is attached to the support handle 102. Remove the plate-shaped hanging fitting 131 from the mounting seat 5a using the bolts 14, 14, position the mounting seat 5a at the bottom of the operating rod 1, and attach the throttle lever 12 via the mounting tool 17 using one of the bolts 14. , is fixed with a nut 18 as shown in FIG.

Further, a vibration-proof grip 16 is attached to the outer periphery of the operating rod 1 over a predetermined length from the tip of the clutch case 5, and an annular hanging fitting 132 of the hanging fitting 13 is attached to the operating rod 1 on the front side of this grip 16. , an ignition plug guard 19 is attached to the upper surface of the outer periphery of the proximal end of the clutch case 5.

The anti-vibration grip 16, as shown in detail in FIG.
Grip part 16a1 Core cylinder 16a1, Support piece 16b1 Bellows part 1
6c1 cylinder part 16d1 cover part 16e etc., core cylinder 1
The parts other than 6a1 are made of elastic members such as rubber.

The base of the transmission shaft 8 is connected to the clip 2 via the boss body 7b, which is common to the float cab type shown in FIGS. 2 and 4.
Bearing 20 fixed to clutch case 5 by 1.21
Further, the base end of the operating rod 1 is inserted deep into the locking wall 5d of the clutch case 5, and the base end surface contacts the bearing 20 via a spacer, so that it can freely rotate in the circumferential direction. At the same time, it is secured to the inside of the locking wall 5d by a clip 21a.

Further, a regulating body 22 made of a hard material, such as metal or hard synthetic resin, and a vibration-proofing rubber 23 are fitted between the operating rod 1 and the fitting hole 5e, which is the outer end of the clutch case 5. (See Figures 4-6).

The regulating body 22 has a detent 2, as shown in detail in FIG.
2a and a tube portion 22b, and the operating rod 1 is inserted and supported with a minute gap in the operating rod insertion hole 22c in the tube portion 22b.

Further, as shown in detail in FIG. 8, the vibration isolating rubber 23 includes a rotation stopper 23a, an operating rod insertion hole 23b, and a stopper hole 2.
3c, the operating rod 1 is rotatably inserted and supported in the insertion hole 23b, and as shown in FIG.
A detent 23a is fitted into the fitting groove 5el of the fitting hole 5e to absorb vibrations of the operating rod 1.

Furthermore, in the diaphragm cab type, an annular stopper 2 is integrally provided within the cover portion 16e of the vibration-proof grip 16.
It is equipped with 4.

As shown in detail in FIG. 9, this stopper unit 24 is
Operation rod insertion hole 24a, slit 24b, and protrusion 24c
The bolts 25 are inserted and tightened on both sides of the slit 24b, and the protrusion 24c is inserted into the anti-vibration rubber 23.
The rotation is prevented by engaging with the stopper hole 23c.

Further, the tip of the anti-vibration grip 16 is fixed by a clamp 26.

Next, the operation of the brush cutter of the present invention will be explained.

When the rotational speed of the prime mover 6 reaches a certain number or more, the centrifugal clutch mechanism 7 is connected and the rotation is transmitted to the transmission shaft 8 via the clutch drum 7a, which rotates the output shaft 2a via the gear case 2 and rotates the cutting blade 3. , carry out mowing work.

In the float cab type, the hook of the hanging band attached to the worker's body is locked to the locking hole 131a of the plate-like hanging fitting 131 to suspend the brush cutter, and the grip 11.11 of the U-shaped handle 101 is Grip it with both hands and use the handle 101 to swing the brush cutter around the suspension point to reciprocate the cutting blade 3 in the left-right direction. While rotating the operating rod 1 in the circumferential direction with respect to the clutch case 5, the rotation of the prime mover 6 is controlled by the throttle lever 12 to perform work.

On the other hand, in the diaphragm cab type, the hook of the hanging band is locked to the annular hanging fitting 132 to suspend the brush cutter, and by grasping the grip 11 of the one-end support handle 102 with one hand, the cutting blade 3 is moved in the left-right direction. While operating the brush cutter by swinging it in a reciprocating manner and holding the vibration-proof grip 16 with the other hand to maintain the posture of the brush cutter, the operator controls the rotation of the prime mover 6 using the throttle lever 12 to perform work.

During this brush cutting work, in both types of brush cutters, the vibrations generated from the prime mover 6 are propagated to the clutch case 5, and the amplitude becomes amplified on the tip side, and the operating rod 1 is directly supported on the tip side. , large vibrations will be transmitted to the operating rod 1 and the handle 10, but in the present invention, the vibration isolating rubber 23 absorbs vibrations and significantly damps the vibration propagation to the operating rod 1 and the handle 10.

At this time, if the vibration absorption amplitude of the anti-vibration comb 23 increases and the axial misalignment between the operating rod 1 and the clutch case 5 increases, the rotation of the transmission shaft 8 and the rotation of the operating rod 1 and the clutch case 5 may increase.
However, in the present invention, since the amplitude of the vibration isolating rubber 23 is limited by the regulating body 22, there is no problem.

In addition, in the present invention, due to its structure, the float cab type handle 10 is changed from a U-shaped handle 101 to a one-end supported handle 102, and a plate-shaped hanging fitting 1 is connected to the mounting seat 5a.
31 and position the mounting seat 5a below the operating rod 1, attach the throttle lever 12 to the mounting seat 5a, and install the stopper unit 24 and the anti-vibration grip 16 at the tip of the clutch case 5 and anti-vibration comb 23. , annular hanging fitting 132
If you install the motor and replace the prime mover 6, you can change it to a diaphragm cab type.

Generally, with a float cab type, it is easier to work by swinging the cutting blade in a slightly inclined position rather than in a horizontal position, so the drive reaction force should prevent the prime mover from rotating in the opposite direction to the operating rod. Since the clutch case with the prime mover is attached to the clutch case and suspended by a hanging band, the operating rod is rotatably supported with respect to the clutch case.

In addition, the diaphragm cab type has a structure in which the cutting blade is positioned at a high place and is supported (grasped) at a distance from the front and back of the operating rod so that it can be used, for example, during delimbing work, and the hanging point by the hanging band is The clutch case and operating rod are fixedly supported in order to prevent the prime mover from rotating due to drive reaction force.

Therefore, in the present invention, the base end of the operating rod is supported in the clutch case so as to be rotatable in the circumferential direction and prevented from coming off.
A vibration isolating rubber is provided between the operating rod and the clutch case to prevent it from rotating relative to the case, and the vibration absorbing amount of this vibration isolating rubber is set within a range that allows for misalignment of the axis between the clutch case and the operating rod. In order to provide a restricting body and to rotate or fix the operating rod with respect to the clutch case,
The support structure between the operating lever and the clutch case can be changed to a float cab type by engaging the anti-vibration rubber and a stopper that is removable and engaging the anti-vibration rubber so that it can be fixedly attached to the operating lever. Now it can also be used with the diaphragm cab type.

In addition, the support structure that can be used in both types minimizes the propagation of vibrations generated by the prime mover through the clutch case to the operating rod, reducing worker fatigue and reducing the impact on the lower back and body. There is.

Moreover, even though it has an anti-vibration support structure, the amplitude is limited by the regulating body, which prevents the axial center from slipping between the clutch case and the operating rod, and prevents the rotary drive system, support, etc. from being supported. , operability is not impaired.

In the above embodiment, the integrated stopper 24 was adapted to be compatible with the float cab type and the tire flam cab type, but the integrated stopper 24
It may also have a structure that is integrally combined with the vibration isolating rubber 23 so that it can correspond to a circular shape.

In addition, although a slight gap was formed between the operating rod insertion hole 22c of the regulating body 22 and the outer peripheral surface of the operating rod 1, this gap was
It may be formed between the inner circumferential surface of the clutch case 5 and the outer circumferential surface of the regulating body 22.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the tip side of the brush cutter, Fig. 2 is a side view showing the base end side of the float cab type brush cutter, and Fig. 3 is a side view showing the tip side of the brush cutter.
FIG. 4 is a side view showing the base end side of the diaphragm type brush cutter, FIG. The vertical sectional view shown in FIG. 6 is a sectional view taken along the line X-X in FIG. 5, A in FIG.
A in the figure is a front view of the anti-vibration rubber, A in FIG. 9 is a vertical cross-sectional view of the opening, A is a vertical cross-sectional view of the stopper integrated therein, and the opening is a partially broken back view. 1... Operating rod, 2... Gear case, 3
...Mowing blade, 5...Clutch case, 6
・・・・・・Prime mover, butt ・・・Transmission shaft, 16...
... Anti-vibration grip, 22 ... Regulatory body, 23.
...Vibration-proof rubber, 24...Stopper integrated.

Claims (1)

[Scope of utility model registration request] In a brush cutter in which a cutting blade is attached to the tip of an operating rod containing a transmission shaft via a gear case, and a prime mover is attached to the base end of the operating rod via a clutch case, the base end of the operating rod is , freely rotatable in the circumferential direction within the clutch case;
A vibration isolating rubber is provided between the operating rod and the clutch case, and is supported in a manner that prevents it from coming out, and prevents rotation relative to the case. In addition to providing a regulating body that limits the axis misalignment to an allowable range, the vibration isolating comb and a removable stopper are integrated with the vibration isolating comb in order to rotate or fix the operating rod with respect to the clutch case. A vibration-proof support device for a brush cutter, characterized in that it can be fixedly attached to an operating rod by engaging with a vibration rubber.