JP3516294B2 - Brake device for brush cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION The present invention is waterproof with maintainability
-It relates to a brake device of a brush cutter with improved dustproofness. [0002] 2. Description of the Related Art Brake devices for brush cutters that cut grass, etc.
For example, JP-A-50-129319
What is described in "Working machine with a cutting blade" is known
You. The above technology is used when the power transmission to the cutting blade is removed.
Positively applies a braking force to the cutting blade side, and turns the cutting blade by inertia
In FIG. 1 of the publication,
Switch mechanism 1, engine 2 and cutting blade 7, FIG.
, The clutch case 1a, in this clutch case 1a
Driven element 1b as accommodating the brake drum, later
At the tip of the lever 10 to swing the lever 10
The attached brake wire 13 is shown in FIG.
Kishu 8, 8, with the these brake shoes 8, 8
Forming the links 9, 9, the clutch case 1a (second sloppy
Pin 11), and rotatably mounted on this pin 11.
Lever 10 which is connected to the distal end of the link 9, 9 with attached
Is shown. [0003] The object of the invention is to be Solved In the above technology, cutting
Each component of the brake device for braking the blade 7 side, that is, the brake
Upper part of shoes 8, 8, link 9, 9, lever 10, pin
11, the upper brake wire 13 of the clutch case 1a
To be exposed, for example, the above parts are cut off
Exposure to rain and wind inside, subject to raindrops, dust, dust, etc. this
If left unattended, each part will rust, so take measures to prevent rust.
I need to do it. [0004] One of the anti-corrosion measures, in the clutch case 1a
There is a structure for housing the respective components. But the clutch
When accommodating the respective components in the casing 1a, for example, a brake
You can adjust the play of the wire 13, the brake wire 13
To replace, only from the outside of the clutch case 1a
It can not, turn off the clutch case 1a from the engine 2 side
There is a need to separate, maintenance becomes poor. Therefore, the present invention
The purpose is a mowing with improved maintainability as well as waterproof and dustproof properties.
It is to provide a brake device cutter. [0005] [MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
Claim 1, the mounting of the clutch case to the front of the engine
Extend the operating rod forward from this clutch case,
Place the cutter at the end of the operating rod and brake on the operating rod.
Attach the lever and transmit the driving force to the cutter within the operating rod
Accommodating a transmission shaft for either engine in a clutch case
Contains a centrifugal clutch that interrupts the driving force transmitted from the transmission shaft to the transmission shaft
Then, the cutter is braked on the transmission shaft side of this centrifugal clutch.
The clutch drum serving as a brake drum for providing,
Support shaft clutch case side wall in the vicinity of the clutch drum
Swingably mounted arm through, the arms
Install the brake shoe pressed against the clutch drum at one end
To the other end of the arm
In the brake device of the bush cutter coupled to Ya, brake
Press the device, the brake shoes to the clutch drum in the arm
Attach the spring for applying, Burekiwa from the support shaft
The first arm is the part up to the ear mounting part.
The second arm part is the part up to the kishu attachment part, and the
Up pulling attachment portion and a third arm portion, Kuratchike
Place the first arm on the outside of the
Attach the cover that covers the first arm to the
Clutch cable with integrally attached to the support shaft to the over-time part
The support shaft is rotatably mounted on the side wall of the
With the tip of the spindle facing the part, and the second and third
Attach arm, In the clutch case, equipped with a front wall, this
Cover insert with an insertion groove in the center in the thickness direction on the front wall of
An opening is provided, and the cover is set up from the bottom and the periphery of this bottom.
Raise the raised wall and the bottom and attach the sides to the wall.
With the upright wall attached, insert the upright wall into the cover insertion section.
In Rukoto, covering spindle, the first arm portion in the coverWith
did. [0006] covering the first arm portion to the outside of the clutch case
Attach the jar cover, second and third in the interior of the clutch case
Arms are installed to improve the waterproofness and dustproofness of the brake device
Let it. Also, remove the cover, play of the brake wire
Facilitate the adjustment and replacement. [0007] DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the accompanying drawings.
A description will be given below. It should be noted that the drawings are to those seen in the direction of the sign
I do. FIG. 1 shows a bush cutter equipped with a brake device according to the present invention.
FIG. 2 is a side view showing a state in which the brush cutter is in use, and the brush cutter 10 is operated.
Person M is suspended from the shoulder by the suspension belt 12 and is equipped with an operation lever.
1 shows a state in which a mowing operation is performed while holding the device 20. The brush cutter 10 includes an engine 13 and this engine.
A cutter 14 driven by gin 13, the engine 13 and mosquitoes
Operating rod 1 as an operating rod passed between the operating rod 1
5, the driving force of the engine 13 to the operating rod 15
A transmission shaft 16 housed for transmission to the cutter 14;
A handle bar 17 attached to the work rod 15, the Han
Grip 18 and the above-mentioned operation Les attached to Doruba 17
And a bar device 20. FIG. 2 shows a brake system according to the present invention.
FIG. 3 is a perspective view of an operation lever device of the brush cutter, and illustrates an operation lever device.
Location 20 includes a handle case 21, the handle case
Controlling the rotational speed of the engine 13 (see FIG. 1) 21
Throttle lever 22 attached swingably to
If, like the cutter 14 (Figure 1 participate in the handle casing 21
Swingable to control the braking state
And a brake lever 23, Ro the throttle lever 22
Throttle return provided to push the handle back to the closing side
Kill for the to lever 24, to stop the engine 13
And a switch 25. The handle case 21
An upper case 28 made of the right case 26, 27, glyceryl
And a lower case 29 also serving as a top. [0010] Figure 3 is provided with a braking device according to the present invention
FIG. 3 is a vertical sectional view of an operation lever device of the brush cutter,
apparatus20Is the throttle lever22Switch connected to the end of
Rottle wire32And the brake lever23At the end of
Tied brake wire33And the throttle lever22When
Brake lever23Cam member arranged between34And
Prepare. [0011] Throttle lever22Is the upper case2
8First shaft part formed on28aCylinder rotatably mounted on
Department22aAnd this cylindrical part22aLever part extended from2
2bAnd substantially fan-shaped plate-like portion22cAnd this plate-shaped part22cTo
Open arc-shaped slot22dAnd the throttle return lever24
Nut was welded to fix (see Fig. 2) with screws
Screw part22eAnd the cam member34Lever part to hit
22bContact surface formed on22fConsists of [0012] The brake lever 23, the upper case 28
Cylindrical portion rotatably attached to the second shaft portion 28b formed at
23a and a lever 23 extending from the cylindrical portion 23a.
Consisting of b and arm portions 23c. Throttle wire 3
2 and the brake wire 33, the engine 13 (FIG. 1 ginseng
)) And pass it through the handlebar 17 from the middle
It is something. The cam member 34 is connected to the throttle lever 22.
The side to open the throttle by hitting the contact surface 22f
Lever stopper 3 that regulates swing to
4a. Here, the reference numeral 28c denotes the opposite of the brake lever 23.
Upper case 28 to regulate clockwise swing
The stopper portion 28d is provided on the left case 26.
Spring stopper, 35 is slotted to throttle lever 22
A sp that gives a swinging force in the direction of rotation to the closed side of the
The ring 36 controls the brake lever 23 to operate the brake.
A spring that gives a swing force in the direction to release
You. FIG. 4 shows a brake device according to the present invention.
It is a cross-sectional view of the operation lever device of the brush cutter. Operation lever
The device 20 is provided with a slot on the side of the cam member 34 (below the figure).
Arranged to sandwich the plate-like portion 22c of the lever lever 22
Friction washers 37, 38 and disc springs 41,
42, the cam member 34, the friction washer 3
7 and 38 and the disc springs 41 and 42
Screw 27a and cap nut 43 to provide
A hexagon socket head cap bolt 44 fixed to the case 27.
You. In addition, 45, 46, 47 are washers, 48, 48 are
It is a case mounting bolt. The slot lever 22 is provided at the end of the plate-like portion 22c.
The part is provided with a throttle wire mounting part 22g.
The throttle wire 32 is attached to the
Attaching the wire tip stopper 32a (see FIG. 3)
It is. The brake lever 23 is an end of the arm 23c.
Equipped with a brake wire mounting part 23d and a cylindrical part 23e.
The brake wire 3 is attached to the brake wire mounting portion 23d.
3 (See FIG. 3)
It is. The right case 27 is a cam that contacts the cam member 34.
A portion 27b is provided. The cam member 34 includes an arm portion 34b and
And to connect with the cylindrical portion 23e of the brake lever 23
It has an elongated hole 34c. The friction washers 37 and 38 are slotted.
Friction by pressing against the plate-like portion 22c of the lever lever 22
Generates force. Rubber is suitable as a material.
It is. The disc springs 41 and 42 are provided with the friction washers 3.
This is for obtaining a load for pressing the 7, 38. The hexagon socket head cap screw 44 is
Changes the role of the shaft and the amount of deflection when the disc springs 41 and 42 are attached.
To change the load generated by the disc springs 41 and 42,
Friction washer on the plate-like portion 22c of the lever lever 22
Pressing load that changes the load when pressing the lockers 37 and 38
It also functions as a weight adjusting member. That is, the hexagon socket head bolt 44 is, for example,
In the case of a screw, turning it to the right will
The disk springs 41 and 42 are largely bent by the head 44a.
Increase the pressing load and turn counterclockwise to rotate the disc springs 41, 4
(2) to reduce the pressing load. Left-hand thread
The same applies to the case of. The arm 2 of the above-mentioned brake lever 23
3c and the cylindrical portion 23e, the cam member 34,
The cam portion 27b of the base 21 and the friction washer 3
7, 38, disc springs 41, 42, and hexagon socket head bolt 4
4 together form a throttle restraint mechanism 49. FIG. 5 is provided with a brake device according to the present invention.
The cam member of the brush cutter and the cam portion of the handle case
FIG. 4 is a perspective view showing a cam portion of a handle case 21 (see FIG. 2).
27b is a plurality of cam ridges 27d on the cam surface 27c.
Is shown. The same applies hereinafter. ). The cam ridge 27d has a slope 27e. Mosquito
The cam member 34 has a cam surface of the cam portion 27b on the bottom of the concave portion 34d.
A cam surface 34e facing 27c is provided.
A cam groove 34f in which the cam ridges 27d of the cam portion 27b engage.
, And a flat surface 34g. The cam groove 34f is inclined
It has a surface 34h. A cam member 34 is provided with respect to the cam portion 27b.
By rotating, a cam member is formed on the slope 27e of the cam portion 27b.
34 moves while being in contact with the slope 34 h of the cam portion 2.
The cam member 34 moves in the axial direction with respect to 7b. That is,
In FIG. 4, the cam member 34 is rotated to form a hexagonal hole.
The bolt 44 moves in the axial direction (vertical direction in the figure). FIG. 6 is a sectional view taken along the line 6-6 in FIG.
A clutch case 10a is provided at the front of the gin 13 (see FIG. 1).
The brake device 70 is attached to the clutch case 10a.
Indicates that was installed. The figure shows the clutch case 10
a shows a state in which a brake cover to be described later has been removed from the front of
You. The brake device 70 is a brake drum machine.
And a drum 71 having a function
To stop the rotation of the cutter 14 (see FIG. 1).
And the brake shoe 72 are attached.
The brake arm 73 as an arm and this brake arm
The brake wire 33 connected to the end of the
A load that presses the brake shoe 72 on the
Tension coil spring 54 and a brake cover
And a brake lever 23 (see FIG. 3). The brake arm 73 includes the clutch case 1
0a is rotatably mounted on a front wall 80b as a side wall.
The rake arm shaft 73a and the brake arm shaft 73a
A first arm portion 73b integrally attached to the
Source10aOf the brake arm shaft 73a
And an inner arm 73c attached to the tip.
Arm 73c includes a second arm 73d and a third arm 73d.
73e. The first arm 73b is connected to the brake wire 3
3 is provided with a brake wire mounting portion 73f for connecting
The second arm portion 73d is provided with the brake arm shaft 7
3a to the mounting part of the brake shoe 72
The third arm 73e is a brake arm.
The tension coil spring 54
Up to the mounting part. The brake arm shaft 73a is
5 (see FIG. 1) from the vertical center line VL of FIG.
On the right side) and below the horizontal center line HL.
is there. Here, 80d is a spring hook portion, and 80e is a block.
Rake wire support, 81, 82 support brake wire
A nut for attaching the brake wire 33 to the portion 80e
G, 83 are male screws provided at the tip of the brake wire 33
Department. FIG. 7 is provided with a brake device according to the present invention.
FIG. 3 is a perspective view of a clutch case and a brake cover of the brush cutter.
There is a brake cover 8 on the front of the clutch case 10a.
5 shows a state in which 5 is mounted. The material of the brake cover 85
Therefore, resins and metals such as iron and aluminum are preferable.
You. The clutch case 10a is separated from the front wall 80b.
The protruding brake cover mounting portions 80f and 80g,
Cover insertion part 80 for inserting a part of brake cover 85
h, 80j and the case where the brake cover 85 is fitted
Stepped portion 80k and wire insertion for inserting brake wire 33
And an entrance 80m. Brake cover mounting part 80
f, 80g are mounting holes for screwing screws 86, 86 at the tip
80n, 80n are opened. The cover insertion portions 80h and 80j are respectively
An insertion groove is formed at the center in the thickness direction.
-The insertion part 80h is integrated with the brake cover mounting part 80f.
And the cover insertion portion 80j is
And formed integrally with the support member 80e (see FIG. 6).
You. The case step 80k is provided with the clutch case 10
a, left and right end faces 80p, 80q provided in the upper front part of
Curved surface 80 provided from the bottom side of the part to the left and right sides of the front part
r. The wire insertion portion 80m is fitted to the front wall 80b.
It is formed by raising the ear side wall 80t. In addition, 8
Numeral 0u denotes a reinforcing wall for reinforcing the wire side wall 80t. The brake cover 85 has a bottom 85a and
A wall 85b rising from a part of the periphery of the bottom 85a,
Stand up from bottom 85a and attach side to wall 85b
Girder standing walls 85c and 85d and clutch case 80a
It comprises bosses 85e and 85f for attachment. The bottom part 85a is a clutch case.10aBefore
Fitting part 85h fitted to the cylindrical part 80v protruding from the part
And a wire escape portion 85 for passing the brake wire 33
j, and an inclined surface 85k having an upper portion inclined backward.
You. The wall 85b is a clutch case10aLeft and right end faces
Left and right upper surfaces 85m, 85n to be fitted to 80p, 80q
And a cover curved surface 85q fitted to the curved surface 80r.
It becomes. The upright wall 85c is formed integrally with the boss 85e.
The clutch case10aCover insert
It is inserted into the part 80h. The upright wall 85d is
Brake supported by the key wire support 80e (see FIG. 6)
Wire tip escape portion 85 serving as an escape for the tip of key wire 33
r, clutch case10aCover insertion part 80j
Is to be inserted into The bosses 85e, 85f are provided with through holes 85s,
85s opened, and the clutch case 10a
Facing the ends of the rake cover mounting parts 80f and 80g,
Insert the screws 86 into the through holes 85s, and attach them.
The clutch case 10 is screwed into the holes 80n, 80n.
This is for attaching the brake cover 85 to a. In this manner, the clutch case 10a
Rake cover 85 and the clutch case 10
a into the cover insertion portions 80h, 80j.
By inserting d, the clutch case10aFront wall 80
brake arm 73 attached to the bottom of b
Shaft 73a, first arm 73b, brake wire attachment
Raindrops, dust, dust, etc. on the cover 73f (see FIG. 6).
Can be prevented. Thus, the brake device 70 (see FIG. 6)
And the receiving part of this movable part, ie, the brake
Arm axis 73a, brake arm axis on front wall 80b
73a (a front wall boss 80y described later),
73f of the arm 73b (specifically,
The stopper insertion hole 73n described later), the brake wire 3
3 to reduce wear of the wire tip stopper 33b (see FIG. 6)
Can be Also, the brake arm shaft 73a, the first
Arm 73 b, at the tip of brake wire 33
The generation of rust can be suppressed. FIG. 8 is a sectional view taken along line 8-8 of FIG.
71 is attached to the cutter via a shaft 71a attached to the front.
14 (see FIG. 1) connected to a transmission shaft 16 for driving
It is. The drum 71 communicates with the engine 13 (see FIG. 1).
Driven by a centrifugal clutch that interrupts the driving force with the drive shaft 16
Side clutch drum. Here, 80w is a bearing, and 80x is a bearing.
Latch case10aAttach the operating rod 15 to the front of the
Rod mounting member for mounting, 80y is a clutch case
10aRotatable brake arm shaft 73a
And a front wall boss provided on the front wall 80b. FIG. 9 shows the structure of the brake device according to the present invention.
FIG. 4 is an exploded perspective view for explaining a first arm of the brake device 70;
The brake arm shaft 73a is integrated with the arm 73b by welding or the like.
To the tip of the brake arm shaft 73a.
Attaching the arm portion 73c by screws 87, the inner arm
73c is pressed against the drum 71 against the second arm 73d.
Attach the rake shoe 72, and further attach the inner arm 73c.
One of the extension coil springs 54 is
Hook the end and clutch the other end of the tension coil spring 54
Spring hook 8 provided on case 10a (see FIG. 8)
0d and the brake wire at the tip of the first arm 73b.
Wire end stop of brake wire 33 at the gear mounting portion 73f
This shows that the fitting 33b is attached. The brake device
The brake cover 85 (see FIG. 7) and the brake
Rekireba 23 (see FIG. 3) is omitted. Here, 73h, 73h (one side is not shown)
Is a flat portion provided at the tip of the brake arm shaft 73a;
3j is a female thread for screwing the screw 87, 73k is a brake
Arm connection hole for inserting arm shaft 73a, 73m is pulled
Spring installation to hang one end of coil spring 54
Holes 73n, 73n insert wire tip stopper 33b.
Stopper insertion hole. The blur of Figure 10 is a brake device according to the present invention
FIG. 2 is a plan view illustrating the arrangement of
Most of the ear 33 is the outer surface of the operating rod 15 of the brush cutter 10.
15a and the vertical center of the operating rod 15
Outer side surface 1 farther from worker M than line VL (see FIG. 6)
5b (see FIG. 6), that is, the center line S of the operating rod 15
Indicates that it is arranged on the surface opposite to the worker M.
As a result, the work on the brake wire 33 is performed during the mowing work.
The arm and the torso of the person M do not touch and hinder the work
Therefore, workability can be improved. [0043] The operation of the control lever device 20 described above
A description will now be given. First, in FIG.
Start the engine 13 (see FIG. 1) without holding the engine 3
You. At this time, the throttle lever 22 is
Thus, they were being regulated in most of the throttle closed position
Therefore, the engine 13 is in an idling state. Also figure
As shown in FIG. 6, the brake device 70
-72 is in the braking state pressing the drum 71,
Even if the engine 13 starts, the cutter 14 (see FIG. 1)
It does not work. FIGS. 11A and 11B show a blur according to the present invention.
It is an action figure explaining an action of a storage device, (a) is a longitudinal section.
(B) is a cross-sectional view. In (a), work
First, the brake lever 23 is
Hold on the flat side and hold. Depressing the brake lever 23
More, the arm portion 23c of the brake lever 23 and the second shaft portion
Swing clockwise around 28b, arm portion 23c
Pulls the brake wire 33. At this time, the circle of the arm 23c shown in FIG.
The column 23e is opened to the arm 34b of the cam member 34.
Since it has been inserted into the elongated hole 34c,
With the swing of the arm portion 23c shown in FIG.
Is counterclockwise around the hexagon socket head bolt 44 which is the axis
Rotating the throttle lever stopper portion of the cam member 34
34a is outside the contact surface 22f of the throttle lever 22.
Then, the restriction on the position of the throttle lever 22 is released. Follow
Thus, the throttle lever 22 can swing. [0046] (b), the cam member 34 is rotated
As described with reference to FIG.
Since the member 34 moves in the axial direction, it is shown in FIG.
The disc springs 41 and 42 flex and become substantially flat, and a large load
Weight is generated and the plate-like portion 22c of the throttle lever 22 is closed.
Pressing with the washer 37, 38
Large between the 22c and the friction washers 37 and 38
Frictional force is generated, and the throttle lever 22 swings.
to bound. If the operation force of the throttle lever 22 is large,
If it is too sharp, turn the hexagon socket head bolt 44
If the bending of the fins 41 and 42 is reduced, the plate-shaped portion 22c and
The frictional force between the friction washers 37 and 38 is small.
Accordingly, the operating force can be reduced. The maintenance of the brake system 70 described above Nitsu
And will be described next. FIGS. 12A and 12B relate to the present invention.
FIG. 4 is an explanatory diagram illustrating maintenance of the brake device.
In (a), for example, the brake wire 33 is replaced.
To remove the clutch case 10a
Remove the brake cover (not shown) from the
3. Loosen the nuts 81 and 82 at the tip of
The male thread 83 of the brake wire 33 is removed from the support 80e.
Remove. Next, stop the insertion hole of the brake arm 73
73n, the brake wire 3 from 73n (one is not shown)
3) Pull out the wire tip stopper 33b. In this way,
DOO 81 and 82 and the wire tip stop 33b is Kuratchike
Because it is exposed to the outside of the case 10a,
The hook 33 can be removed. In (b), for example, a brake wire
Inserted wire portion within 33 extends, the brake lever
23 (see FIG. 11 (a)).
When the Kishu is no longer distant enough, brake while working
Brake device 70 with only a slight return the lever braking
State. Therefore, when the brake lever is depressed,
The distance between the beam and the brake shoe in order to ensure sufficient,
The play of the brake wire 33 is adjusted. In this play adjustment, first, the brake wire 3
The nut 82 screwed into the external thread 83 at the end of
Loosen with nut S etc., and tighten nut 82 to the tip of brake wire 33
Move to the side. Next, the brake wire 33 (specifically,
The outer part of the rake wire 33) to the first arm 73b.
In a direction away from, and brake shoes from the drum is away
The nut 81 with a spanner S or the like.
To the tip side of the brake wire 33, and
Screw 81 to secure it to the brake wire support 80e.
To re-fix the Rekiwaiya 33. Now, brake Wai
Play adjustment of ya 33 is completed. In this way, the nut 8
1, 82 are exposed outside the clutch case 10a.
Thus, the play adjustment of the brake wire 33 can be easily performed.
it can. The brake device 70 of the present invention is a brush cutter.
Not only one but also other working machines, such as lawn mowers, flat blades
(Hedge trimmer). In addition, the blur of the present invention
As shown in FIG. 9, the parking device 70 includes a first arm 7
Assume that the brake arm shaft 73a is integrally attached to 3b
The second and third arms are attached to the tip of the brake arm shaft 73a.
Although the parts 73d and 73e are detachably attached, the second and third parts
Connect the brake arm shaft 73a to the arm portions 73d and 73e.
The brake arm shaft 73a
One arm 73b may be detachably attached. [0054] According to the present invention, the following effects are exhibited by the above configuration.
I do. Brake device according to claim 1, outside of the clutch case
With arranging the first arm portion in part, the clutch case
Attach the cover that covers the first arm to the first arm
In the clutch case side wall is attached to the support shaft integrally
Mounting the supporting shaft rotatably support shaft inside the clutch case
And the second and third arm sections
The mounting,The clutch case has a front wall, and this front wall
Setting the cover insertion portion formed with insertion grooves in the central portion in the thickness direction
Cover, the bottom, and the wall raised from the periphery of this bottom
Part and the side that is raised from the bottom and the side is attached to the wall.
With a standing wall, and inserting the standing wall into the cover insertion part
Then, cover the spindle and the first arm with a cover.Because such things,
The first arm portion of the outer of the clutch case and the clutch case
Of raindrops, dust, dust, etc. on the second and third arms inside the
Can be prevented, improving the waterproofness and dustproofness of the brake device
Can be done. Also, by removing the cover,
Adjustment and exchange of the brake wire attached to the first arm
換等 can be easily performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a state in use of a brush cutter having a brake device according to the present invention. FIG. 2 is an operation lever device of a brush cutter having a brake device according to the present invention. FIG. 3 is a longitudinal sectional view of an operation lever device provided with a brake device according to the present invention. FIG. 4 is a transverse sectional view of an operation lever device of a brush cutter provided with a brake device according to the present invention. FIG. 6 is a perspective view showing a cam member of a brush cutter having a brake device according to the present invention and a cam portion of a handle case. FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 1. FIG. FIG. 8 is a perspective view of a clutch case and a brake cover of the brush cutter. FIG. 8 is a sectional view taken along line 8-8 of FIG. 1. FIG. 9 is an exploded perspective view illustrating a configuration of a brake device according to the present invention. Plan view for explaining the arrangement of brake wires of the brake device FIG. 11 is an operation diagram for explaining the operation of the brake device according to the present invention. FIG. 12 is an explanatory diagram for explaining the maintenance of the brake device according to the present invention. ... Engine, 14 ... Cutter, 15 ... Operation rod (operation rod), 1
6 ... transmission shaft, 23 ... brake lever, 33 ... brake wire, 54 ... spring (tensile coil spring), 7
0: brake device, 71: clutch drum (drum),
72: brake shoe, 73: arm (brake arm), 73a: support shaft (brake arm shaft), 73b: first arm portion, 73d: second arm portion, 73e: third arm portion, 73f: brake wire mounting portion , 80b: Side wall (front wall) of clutch case , 80h, 80j: Insert cover
Part , 85 ... cover (brake cover) , 85a ... bottom part,
85b: wall portion, 85c, 85d: standing wall .

──────────────────────────────────────────────────続 き Continuation of the front page (72) Kenji Higashi 1-4-1, Chuo, Wako-shi, Saitama Inside of Honda R & D Co., Ltd. (56) References JP-A-9-163849 (JP, A) JP-A-Hei 8-172846 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) A01D 34/68 A01D 69/10 F16D 49/00

Claims (1)

(1) A clutch case is attached to a front part of the engine, an operating rod is extended forward from the clutch case, a cutter is disposed at a tip of the operating rod, and a brake is provided on the operating rod. A lever is mounted, a transmission shaft for transmitting a driving force to the cutter is housed in the operating rod, and a centrifugal clutch for interrupting the driving force transmitted from the engine to the transmission shaft is housed in the clutch case. A clutch drum which also functions as a brake drum for braking the cutter is provided on the transmission shaft side of the clutch drum, and an arm is attached to a side wall of the clutch case near the clutch drum via a support shaft so as to be swingable. Attach the brake shoe to press, and connect the brake wire pulled by the brake lever to the other end of the arm. In key device, this braking device, fitted with a spring for pressing the brake shoe to the clutch drum to the arm, from the support shaft to the brake wire attachment portion and a first arm portion, the brake from the support shaft A second arm portion up to a shoe attachment portion is a third arm portion from a support shaft to the spring attachment portion. The first arm portion is arranged outside the clutch case and the clutch case covers the first arm portion. A cover is attached, a support shaft is integrally attached to the first arm portion, and a support shaft is rotatably mounted on the side wall of the clutch case, with a tip of the support shaft facing the inside of the clutch case. 2. Attach the third arm portion , the clutch case has a front wall, and the front wall has a thickness of
A cover insertion portion having an insertion groove formed in a central portion of the cover, the cover having a bottom portion and a wall rising from a peripheral edge of the bottom portion.
Part and stand up from the bottom and attach the side to the wall.
And an upright wall attached thereto, and the upright wall is inserted into the cover insertion portion, so that the cover is inserted.
A brake device for a brush cutter , wherein the shaft and the first arm are covered with a key.