JP2547360Y2 - Cutting blade fixing device of brush cutter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting blade fixing device of a brush cutter for cutting grass and the like by rotating a disk-shaped cutting blade.

[0002]

2. Description of the Related Art Conventionally, portable brush cutters having a driving unit such as an engine or an electric motor and rotating a disk-shaped cutting blade by the power from the driving unit have been widely used. The structure of the bush cutter will be described with reference to FIGS. First, FIG. 8 shows the entire configuration of a brush cutter, in which a cylindrical holder 2 is formed in the engine 1, and one end side of a hollow pipe 3 is inserted and held in the holder 2, The other end of the pipe 3 is inserted into the gear case 4 and fastened and fixed by bolts 5. In addition,
A transmission shaft 7 for transmitting the power from the engine 1 to the cutting blade shaft 6 housed and held in the gear case 4 is rotatably held in the pipe 3 by a plurality of bearings (not shown). Have been.

[0003] Here, the cutting blade shaft 6 includes a pair of bearings 8 and 9.
The bevel gear 10 press-fitted and fixed to the upper part of the cutting blade shaft 6 meshes with a bevel gear 11 spline-fitted to the transmission shaft 7.
Further, the cutting blade shaft 6 is formed so that its lower end extends outside the gear case 4, and a spline groove 12 is formed in the outer peripheral portion on the lower end side of the cutting blade shaft 6. A female screw 13 is formed inside the side.

Next, a cutting blade holder 14 and a cutting blade holder 15 are spline-fitted around the outer periphery of the cutting blade shaft 6, and the cutting blade holder 14 and the cutting blade holder 15 are connected to the female screw. 13 is fastened and fixed by a bolt 16 screwed. The cutting blade holder 14 has a dish-shaped dust slinger 17 for preventing soil and grass from entering the gear case 4 and a disc-shaped cutting blade 18 for cutting grass and the like.
And a fitting hole 20 formed in the center of the dust slinger 17 and the fitting hole 2 formed in the center of the cutting blade 18.
1 is fitted to the projection 19. The dust slinger 17 and the cutting blade 18 are clamped and fixed by the cutting blade holder 14 and the cutting blade holder 15 by tightening the bolt 16.

The gear case 4 has a lock pin 2
The cutting blade holder 14 is formed with two locking recesses 24 into which the tip of the lock pin 22 is engaged.

In such a configuration, the power from the engine 1 is transmitted to the cutting blade shaft 6 via the transmission shaft 7 and
The brushing operation is performed by rotating the blade 8 integrally with the blade shaft 6.

Next, a procedure for replacing the cutting blade 18 will be described. First, the lock pin 22 is inserted into the lock pin hole 23, and the cutting blade holder 14 is attached to the cutting blade shaft 6 and the cutting blade 1.
The cutting blade holder 14 and the cutting blade shaft 6 are prevented from rotating by engaging the tip of the lock pin 22 with the locking recess 24 by adjusting the rotation together with the cutting pin 8. Next, the cutting blade 18 is removed by removing the bolt 16.

[0008]

When the bolt 16 is removed, as shown in FIG. 11, the blade holder 15 and the blade 1 are removed.
8, the dust slinger 17 and the cutting blade holder 14 are disengaged from the cutting blade shaft 6, and the work of assembling a new cutting blade 18 is troublesome.

Further, since the number of parts to be separated at the time of replacement of the cutting blade 18 is large, a trouble that parts are lost easily occurs.

[0010]

SUMMARY OF THE INVENTION The invention of this application is based on the fact that a cutting blade holder and a cutting blade holder are mounted on a rotatably driven cutting blade shaft, and a dust slinger and a disk are formed by the cutting blade holder and the cutting blade holder. In the brush cutter having the blade-shaped cutting blade, a column-shaped protrusion is formed in the cutting blade holder, into which the fitting hole formed in the dust slinger is fitted, and a groove is formed in an outer peripheral portion of the protrusion. Forming a plurality of caulking holes or caulking projections at the peripheral edge of the fitting hole in the dust slinger, expanding the caulking hole and projecting the peripheral edge of the fitting hole inward or The caulking projection was deformed inward and caulked to the groove.

[0011]

[0012]

In the invention of this application , since the dust slinger is crimped in the groove of the cutting blade holder, the dust slinger and the cutting blade holder are integrated when the cutting blade retainer is removed when replacing the cutting blade. It is maintained in the state. Therefore, the number of parts to be separated is reduced, and the work of assembling the cutting blade can be easily performed.

[0013]

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. 8 to 11 are denoted by the same reference numerals, and description thereof will be omitted. In the gear case 4, the cutting blade shaft 25 is provided by a pair of bearings 8 and 9.
Is rotatably held. A spline groove 12 is formed in the outer peripheral portion on the lower end side of the cutting blade shaft 25, and a female screw 13 is formed inside the lower end side of the cutting blade shaft 25. And
A cutting blade holder 26 and a cutting blade holder 15 are spline-fitted to the outer peripheral portion of the cutting blade shaft 25, and these cutting blade holders 26
The cutting blade retainer 15 is fastened and fixed by a bolt 16 screwed to the female screw 13.

The cutting blade holder 26 has a columnar projection 28 for mounting a dust slinger 27 and a cutting blade 18, and a fitting hole 20 formed at the center of the dust slinger 27 and the cutting blade. A fitting hole 21 formed at the center of the blade 18 is fitted into the protrusion 28, and the dust slinger 27 and the cutting blade 18 are connected to the cutting blade holder 26.
And the cutting blade retainer 15 for clamping and fixing.

Next, a ring-shaped groove 29 is formed on the outer periphery of the projection 28, and the groove 29 is formed to face the position where the dust slinger 27 is fitted. The size is set substantially equal to the thickness size of the dust slinger 27. In the dust slinger 27, four caulking holes 30 are formed at an interval of 90 ° from each other at a peripheral portion of the fitting hole 20. Then, the dust slinger 27 is connected to the protrusion 2.
8 and fit the peripheral edge of the fitting hole 20 into the groove 29.
Then, a caulking jig (not shown) is inserted into the caulking hole 30 and a force in the direction of arrow a is applied to expand the caulking hole 30. Then, the initially circular caulking hole 30 is deformed into a substantially elliptical shape, and the peripheral edge of the fitting hole 20 projects inward to engage with the groove 29, and the dust slinger 27 is caulked to the groove 29. Is done.

A gap 3 is provided between the cutting blade holder 26 and the cutting blade holder 15 at the outer periphery of the cutting blade shaft 25.
A ring-shaped groove 32 is formed in a portion of the outer peripheral portion of the cutting blade shaft 25 opposite to the gap 31, and a retaining member for retaining the cutting blade holder 26 in the groove 32. A certain clip 33 is attached.

In such a configuration, the power from the engine 1 is transmitted to the cutting blade shaft 25 via the transmission shaft 7, and the cutting blade 18 is driven to rotate integrally with the cutting blade shaft 25 so that the mowing operation is performed. Done.

Next, the procedure for replacing the cutting blade 18 is the same as that of the conventional example, in which the lock pin 22 is inserted into the lock pin hole 23, and the tip end of the lock pin 22 is locked.
Then, the cutting blade holder 26 and the cutting blade 18 are prevented from turning, and then the cutting blade 18 is removed by removing the bolt 16.

Here, when the bolt 16 is removed to replace the cutting blade 18, the cutting blade holder 26 is prevented from being removed from the cutting blade shaft 25 by the clip 33 as shown in FIG. Are integrated with the cutting blade holder 26 by being swaged in the grooves 29. Therefore, when the cutting blade 18 is replaced, only the cutting blade holder 15 and the cutting blade 18 are separated from the cutting blade shaft 25, and the number of separated parts is reduced. Therefore, a new cutting blade 18 can be easily assembled, and the frequency of occurrence of troubles such as loss of separated parts is greatly reduced.

Further, since the dust slinger 27 is fixed to the cutting blade holder 26 by caulking, a dedicated component for fixing the dust slinger 27 to the cutting blade holder 26 is not required, and the cost is reduced.

Next, a second embodiment of the present invention will be described with reference to FIG. 1 to 4 are denoted by the same reference numerals, and description thereof is omitted (the same applies hereinafter). At the center of the dust slinger 34, a fitting hole 20 to be fitted to the projection 28 of the cutting blade holder 26 is formed. Square holes 35 are 9
It is formed with an interval of 0 °. The square hole 3
Numerals 5 are connected to the fitting holes 20, respectively, and a crimping projection 36 is formed at a portion sandwiched between the fitting holes 20 and the square holes 35. Then, as shown in FIG.
8, the caulking protrusion 36 is made to face the groove 29 formed in the protrusion 28, and then a caulking jig (not shown) is inserted into the square hole 35 to apply a force in the direction of arrow a.
Then, as shown in FIG. 2B, the crimping projection 36 is deformed inward and engages with the groove 29, and the dust slinger 3
4 is crimped to the groove 29.

In such a configuration, when the bolt 16 is removed to replace the cutting blade 18, the cutting blade holder 26 is prevented from being removed from the cutting blade shaft 25 by the clip 33 as in the first embodiment. The dust slinger 34 is
9 is integrated with the cutting blade holder 26 by caulking. Therefore, when the cutting blade 18 is replaced, only the cutting blade holder 15 and the cutting blade 18 are separated from the cutting blade shaft 25, and the number of separated parts is reduced. For this reason,
A new cutting blade 18 can be easily assembled, and the frequency of occurrence of troubles such as loss of separated components is greatly reduced.

Next, a third embodiment of the present invention will be described with reference to FIGS. A cutting blade holder 37 is spline-fitted to the outer peripheral portion of the cutting blade shaft 25, and four grooves 38 are provided on the outer peripheral portion of the protruding portion 28 of the cutting blade holder 37 at positions spaced from each other by 90 °. Are formed, and these grooves 38 are formed.
The peripheral portion of the fitting hole 20 of the dust slinger 27 is engaged with the dust slinger 27, and the dust slinger 27 is crimped to the groove 38.

The groove 38 is formed on the mounting surface 39 of the cutting blade holder 37 on which the dust slinger 27 is mounted.
This is done by forming a window 41 that does not reach the lower end surface 40 of the cutting blade holder 37 from the opposite side. When the cutting blade holder 37 is made of aluminum die-cast, the window 41 can be easily formed by casting.

In such a configuration, when the bolt 16 is removed to replace the cutting blade 18, the cutting blade holder 37 is attached to the cutting blade shaft 25 by the clip 33 as in the first and second embodiments. From the dust slinger 27
Is clamped in the groove 38 so that the cutting blade holder 37
It is integrated into. Therefore, when the cutting blade 18 is replaced, the cutting blade holder 15 and the cutting blade 1 are separated from the cutting blade shaft 25.
There are only eight, and the number of parts to be separated is small. Therefore, a new cutting blade 18 can be easily assembled, and the frequency of occurrence of troubles such as loss of separated parts is greatly reduced.

[0027]

According to the invention of this application , a cutting blade holder and a cutting blade holder are mounted on a rotating blade blade, and a dust slinger and a disk-like cutting blade are formed by the cutting blade holder and the cutting blade holder. The dust slinger is formed by forming a columnar projection in the cutting blade holder into which a fitting hole formed in the dust slinger is fitted, and forming a groove in an outer peripheral portion of the projection. Forming a plurality of caulking holes or caulking projections on the peripheral edge of the fitting hole, and expanding the caulking hole and projecting the peripheral edge of the fitting hole inward or the caulking projection. Was deformed inward and was caulked in the groove, so that the dust slinger and the cutting blade holder could be maintained in an integrated state when the cutting blade holder was removed during replacement of the cutting blade. When replacing the cutting blade Have an effect and the like can be part separated with the assembly of the new cutting blade for parts to be separated is reduced can be easily performed can be greatly reduced the frequency of trouble that lost.

[0028]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a first embodiment of the present invention.

FIG. 2 is an exploded longitudinal side view.

FIG. 3 is a bottom view as seen from the direction of arrow Z in FIG. 2;

FIG. 4 is a sectional view taken along line AA in FIG.

FIG. 5 is a bottom view showing a second embodiment of the present invention.

FIG. 6 is a bottom view showing a third embodiment of the present invention.

FIG. 7 is a sectional view taken along line BB in FIG. 6;

FIG. 8 is a perspective view showing the entire structure of the conventional brush cutter and the brush cutter according to the present invention.

FIG. 9 is a longitudinal sectional side view showing a conventional example.

FIG. 10 is a sectional view taken along line CC in FIG. 9;

FIG. 11 is an exploded longitudinal side view.

[Explanation of symbols]

 15 Cutting Blade Holder 18 Cutting Blade 20 Fitting Hole 25 Cutting Blade Shaft 26,37 Cutting Blade Holder 27,34 Dust Slinger 28 Projection 29,38 Groove 30 Screwing Hole 31 Gap 33 Prevention Member 36 Staking Protrusion

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takao Shimojo 1-1-1 Ishiba, Matsumoto City, Nagano Prefecture Inside the Matsumoto Plant of Ishikawa Shima Shibaura Machinery Co., Ltd. (72) Inventor Hideki Kama 1-chome Ishiba, Matsumoto City, Nagano Prefecture No. 1-1 Ishikawa Shima Shibaura Machinery Co., Ltd. Matsumoto Plant (56) References Japanese Utility Model Sho 57-76432 (JP, U) Japanese Utility Model Hei 4-88226 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] A cutting machine comprising a cutting blade holder and a cutting blade holder attached to a rotating blade shaft, and a dust slinger and a disk-shaped cutting blade held between the cutting blade holder and the cutting blade holder. In the dust slinger, a column-shaped projection into which a fitting hole formed in the dust slinger is fitted is formed on the cutting blade holder, and a groove is formed on an outer peripheral portion of the projection. Forming a plurality of caulking holes or caulking projections on the peripheral edge, expanding the caulking hole and projecting the peripheral edge of the fitting hole inward or deforming the caulking projection inward. A cutting blade fixing device for a brush cutter, wherein the cutting blade is fixed by caulking to the groove.