JP2000142496A - Operating part for working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operability by providing a release member of a work clutch lever on a rotating shaft interlockingly connected to the base part of a travel clutch lever, and interlockingly connecting an engaging body to the work clutch lever. SOLUTION: An engagement release pin 104 serving as a release member of a work clutch lever 59 is fixed onto a rotating shaft 78 interlockingly connected to the base part of a travel clutch lever. The front part of an engaging body 89 with the pointed rear end to be lock mechanism is pivotally supported to the lower part of a rotating arm 96, and the engaging body 89 is extended toward the outer peripheral surface of a boss 90. The engagement release pin 104 is rotated in conformity to the operation of the travel clutch lever so as to make the engaging body 89 movable between a lock release position below the boss 90 and a lock position to be inserted in an engaged part at the front upper part of the boss 90. With this constitution, the engagement release pin 104 constituting lock mechanism is interlocked with the travel clutch lever in operation through the rotating shaft 78 to serve for the function of a deadman clutch lever. Operability is therefore improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work unit provided on a machine provided with an engine, a traveling device, and the like, and to an operation configuration of the machine and the work unit.

[0002]

2. Description of the Related Art Conventionally, a walk-type work machine in which a work machine such as a snowplow or a mower is disposed at a front portion and a steering wheel, a steering lever, and a traveling operation device are disposed at a rear portion, has a hand-operated handle. A safety mechanism is provided to stop the engine when it is released, or to stop traveling drive or work drive.

Further, a switch for detecting a state in which the hand is released from the operating handle is provided, and the engine can be started by performing a start operation of a key switch or the like in a state where the operation of releasing the hand is not performed. To ensure that the aircraft was not accidentally launched.

[0004] Further, a shift lever is provided in the operation portion, and the shift lever is operated along a guide groove provided in an operation panel so as to operate a forward / reverse shift or a neutral position at a center position.
A linear guide groove is provided at the neutral position to provide a step at a right angle to the straight line at the neutral position so that the shift lever does not contact the step at the neutral position so that the shift lever does not accidentally be guided to the reverse shift position when operating from the forward position to the neutral position. A technique for achieving the above has been known.

[0005]

However, in the above-described operation configuration, when the clutch lever for snow removal and the clutch lever for traveling are simultaneously held, the force is large and it is difficult to perform a long-time operation. Was.

Further, the switch for detecting the state in which the hand is released from the operation handle only detects whether or not the traveling operation is being performed, and does not detect the operation state of the working machine. There was a problem that the work machine was driven at the same time as the engine was driven by the operation.

Further, the power transmission by the snow-removing clutch is cut off to stop the snow-removing section. However, the auger and the blower have a large rotary inertia force, and are idle for a while after the power transmission is turned off. There was a problem that the snow could be thrown continuously from the shooter.

Further, in order to provide a step at a neutral position of a guide groove for guiding the shift lever and to guide the shift lever to the reverse or forward shift position beyond the step, it is necessary to operate the shift lever left and right. It was necessary to provide play on the shift lever so that the operation could be performed smoothly. In particular, in the technology in which the main shift is performed by operating the single shift lever back and forth, and the sub-shift can be performed by the left-right operation, the sub-shift operation is inadvertently performed if the left-right operation is performed to exceed the above-mentioned step. There was a problem that it was done.

[0009]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, in a working machine in which a traveling clutch lever and a working clutch lever are arranged in an operation section, a release member for the working clutch lever is provided on a rotating shaft interlockingly connected to a base of the traveling clutch lever, and an engaging member is attached to the working clutch lever. And the engaging member is engaged with the release member when the traveling clutch lever and the work clutch lever are turned on. Further, in a working machine in which the traveling clutch lever and the work clutch lever are arranged in the operation section, switches for detecting the operation positions of the both clutch levers are provided, and the switches are connected to an engine starting circuit, and the engine is turned off when both clutch levers are turned off. Can be started. In addition, when the machine is mounted on a traveling device, a power unit such as an engine and a transmission mechanism is arranged in the machine, and a power unit is disposed in front of the machine to transmit power to the work machine. A belt tension type clutch mechanism for connecting and disconnecting the tension arm is provided, and a holding plate is attached to the tension arm so as to be adjustable in position. In addition, this machine is mounted on the traveling device, the working part is arranged in front of it, the operation part is arranged in the rear part, and the traveling speed change lever provided in the operation part can be turned back and forth and left and right In the working machine that supports the main transmission and the sub-transmission by supporting the transmission, the transmission lever is divided into upper and lower parts, and the upper part of the transmission lever is flexibly connected to the left and right by a connecting member having flexibility on the left and right. A stopper is provided at the lower part of the lever to regulate the amount of left and right deflection of the upper part of the transmission lever.

[0010]

Next, an embodiment of the present invention will be described. 1 is an overall side view of the snow blower, FIG. 2 is a front view partially showing a configuration of a traveling clutch, FIG. 3 is a front view showing a configuration of a snow removal clutch, and FIG. 4 is a rear view showing a configuration of a shift lever. 5 and FIG. 5 are side views, FIG. 6 is a plan view and a partial cross-sectional view thereof, FIG. 7 is a plan view showing the shape of a groove for guiding a shift lever, and FIG. 8 shows a link mechanism interlocked with a traveling clutch lever. FIG. 9 is a rear view showing a link mechanism interlocked with the left and right clutch levers. FIG. 10 is a right side view in the advancing direction of a lock mechanism that locks the snow removing clutch lever in a downwardly rotated state. FIG. 2 is a circuit diagram showing an engine starting electric circuit.

First, a description will be given using a snow removing machine as a walking-type work machine. The overall configuration of the snowplow is as shown in FIG.
A snow removing section D is continuously provided at the front of the machine A. The snow removing section D has an auger housing 8 that covers the auger 26 for scraping snow at the forefront.
A blower cover 6 in which a blower is provided is connected to a rear portion of the auger housing 8, and a snow removal chute 7 capable of turning horizontally by a motor M is provided above the upper portion of the blower cover 6. It is protruding. The machine A is covered with the machine cover 1, the engine E is built in the machine cover 1, the bonnet 2 is arranged on the upper part, and the work lamp 3 protrudes from the upper part of the bonnet 2. A battery B is provided behind the engine E, and an operation unit C is formed behind the battery B.

An HST type transmission H and a transmission case T are disposed below the engine E, and the output shaft 17.
7 is protruded left and right and inserted into the chain case 18,
The chain case 18 is connected to the chain case 18 via a power transmission structure including a sprocket and a chain (not shown).
The driving sprocket 13 can be driven by transmitting a driving force to a driving shaft 11 supported at the rear part.

[0013] In addition, driven idlers 15, 15 rotatably supported on support shafts 14, 14 serving as running driven shafts are disposed at the front of the track frame of the crawler type traveling device.
The crawler 16 winds the space between the driven idler 15 and the drive sprockets 13 fixed to the drive shaft 11 to form a crawler-type traveling device.

The body frame 50 is supported so as to be able to move up and down and up and down around the output shaft 17 which is a rotation fulcrum shaft. The body frame 50 side, that is, the snow removal section D and the engine E except for the crawler type traveling device. , The transmission case T and the operation unit C are rotated so that the height of the auger 26 of the snow removal unit D can be adjusted.

A drive pulley 2 is provided on the output shaft of the engine E.
3 and the driving pulley 23 is a double pulley,
A rear traveling drive pulley 23a and the HST transmission H
The driving power transmission belt 27 shown in FIG. 2 is wound around the HST input pulley 24 to transmit the driving force to the HST transmission H. An auger input shaft 25a protruding rearward from the snow removing drive pulley 23b and the blower cover 6 is used as a snow removing drive pulley 23b at the front of the drive pulley 23.
An auger 26 and a blower are driven by winding a snow removal drive transmission belt 28 shown in FIG.

The power transmission from the engine E to the HST type transmission H and the snow removing section D includes a belt tension type clutch. That is, as shown in FIG. 2, a tension roller 29 is rotatably supported via an arm 30 so as to be in contact with the outer peripheral surface of the traveling drive transmission belt 27. A connecting rod 31 is pivotally connected to an intermediate portion of the arm 30, and a base of the connecting rod 31 is fixed to an arm 33 at a front end of a traveling operation shaft 32 laid laterally on the left side of the transmission case T. When the operating shaft 32 is rotated in conjunction with a traveling clutch lever 58 of the operating section C, a belt tension type traveling clutch using the tension roller 29 is configured.

As shown in FIG. 3, a tension roller 34 is rotatably supported via an arm 35 so as to be in contact with the outer peripheral surface of the snow removal drive transmission belt 28.
The rotation base of the arm 35 is fixed to the front end of the snow removal rotation operation shaft 36 laid on the right side of the transmission case T, and the snow removal rotation operation shaft 36 is disposed on the operation part C, which will be described later. A belt tension type snow removal clutch for snow removal is configured to be rotatably operated in conjunction with the work clutch lever 59.

A turning base of a tension plate 37 is pivotally supported immediately before the arm 35 on the turning shaft 36 for snow removal. The tension plate 37 extends toward the vicinity of the outer peripheral surface of the auger pulley 25, and has an abutting portion 37a whose end is bent so as to be able to abut in parallel with the outer peripheral surface of the auger pulley 25. Further, the tension plate 37 has a long hole 37b extending in the circumferential direction of the snow removing rotation operation shaft 36 at a portion projecting from the rotation base in the direction along the arm 35, and a bolt is provided in the long hole 37b. 38 is inserted and screwed into the arm 35, the mounting position of the tension plate 37 with respect to the arm 35 is adjusted around the snow removing rotation operation shaft 36, and the tension plate 37 is rotated together with the arm 35.

Accordingly, when the snow removal rotating operation shaft 36 is rotated, the tension roller 34 is rotated via the arm 35 to apply tension to the snow removal drive transmission belt 28 and drive the auger pulley 25. It can be transmitted. At this time, the contact portion 37 of the tension plate 37
“a” is rotated in a direction away from the auger pulley 25.

Conversely, when the snow removal rotating operation shaft 36 is rotated in the reverse direction, the tension roller 34 is separated from the snow removal drive transmission belt 28 to release the tension, and the drive to the auger pulley 25 is transmitted. Is cut off. At this time,
The contact portion 37a of the tension plate 37 is in contact with the outer peripheral surface of the auger pulley 25 or the snow removal drive transmission belt 28 wound around this portion, and brakes the rotation of the auger pulley 25 to apply the auger 26 and the blower. Can be forcibly stopped,
The snow removal operation can be stopped suddenly.

Next, the operation section C provided at the rear of the machine A will be described. In the operation section C, an operation panel 5, a handle frame 4, and the like are arranged. As shown in FIG. 8, the operation panel 5 is fixed on handle frames 4.4 projecting rearward from the rear portions of the left and right body frames 50. As shown in FIG. 1, an accelerator lever 53 for adjusting the output of the engine E, a traveling speed change lever 54, and left and right side clutch levers 55 are operably guided on the operation panel 5, and further shown on the right side thereof. A snow throwing direction adjustment lever and an auger housing rotation adjustment lever (not shown) are provided. Furthermore, each handle frame 4 on the left and right
Four clutch levers 58 and 59 are disposed on the rear handle portion so as to be rotatable upward.

As shown in FIG. 4, the side clutch levers 55 are each provided with a side clutch operation link 60.
The drive transmission to the crawler-type traveling device on the operated side is stopped by being linked with the side clutch arms 61, 61 provided at the rear of the transmission case T via 60, so that the vehicle can turn to the operated side.

As shown in FIGS. 4 and 5, the traveling speed change lever 54 is supported by the machine A via a rotation support 66, and is supported so as to be able to rotate forward, backward, left and right. .

That is, a front-rear shaft 67 having a shaft center at the front and rear is fixedly mounted from a side of the machine via a stay (not shown).
7 is externally fitted with a boss provided at the front part of the rotary support 66 so that the traveling speed change lever 54 can be operated left and right. Also,
Left and right shafts 6 having left and right shaft centers at the rear part of the rotary support 66
8 can be pivoted about the left / right axis 68 as a fulcrum, thereby enabling the front / rear operation of the traveling speed change lever 54.

One end of a rod constituting a main transmission link mechanism 70 is pivotally supported at the rear of a lower portion of a transmission lever 54b extending rearward from the left and right shafts 68, and the other end of the main transmission link mechanism 70 is an HST type. It is connected to an arm (not shown) for adjusting the inclination angle of the swash plate in the transmission H so that a forward / backward traveling speed change (main speed change) operation can be performed. Further, an arm 71 is fixedly provided at a front portion of the boss of the rotation support 66 which is rotated about the front-rear shaft 67, and the arm 71 is provided to protrude rightward to constitute a sub-transmission link mechanism at an end. Rod is pivoted. The other end of the auxiliary transmission link mechanism is operatively connected to a fork operating shaft for performing an auxiliary transmission in the transmission case T.

The traveling transmission lever 54 is vertically divided into a rod-shaped operation lever 54a and a plate-shaped transmission lever lower portion 54b.
Are connected via a connecting member having flexibility in the left-right direction such as a leaf spring 69. The leaf spring 69
Is supported so that the upper operating rod 54a can be tilted left and right with respect to the shift lever lower portion 54b.

The upper portion of the lower portion 54b of the transmission lever is bent horizontally just below the operation panel 5 in front of the operation rod 54a, and an engagement plate 65 is screwed onto the upper surface thereof.
An insertion hole 65a shown in FIG. 6 is opened in the engagement plate 65 located behind the upper portion of the transmission lever lower portion 54b,
The operation rod 54a is disposed through. The insertion hole 65a
Is formed to be wider than the diameter of the operating rod 54a, and the operating rod 54a is tilted to the left and right within the range of the left and right width of the insertion hole 65a by using the bending of the leaf spring 69, so that the play of the traveling speed change lever 54 in the left and right operating direction is reduced. Has formed. When the operation lever 54a is further tilted from this play, the operation rod 54a comes into contact with the insertion hole 65a to act as a stopper, and the rotation support 66 rotates about the front-rear shaft 67 together with the shift lever lower portion 54b to perform the sub-shift operation.

The stopper for limiting the play range in which the operation lever 54a can bend left and right is not limited to the insertion hole 65a provided in the engagement plate 65, but the operation lever 54a is sandwiched between the lower portion 54b of the transmission lever. It is also possible to adopt a configuration in which a fork-shaped stopper or a piece serving as a stopper is provided by bending and forming a part of the shift lever lower portion 54b.

The left / right and front / rear operations of the traveling speed change lever 54 are guided by guide grooves 75 formed in the operation panel 5. As shown in FIG. 7, the guide groove 75 has two main speed change grooves 7 in the front-rear direction equal to the traveling direction.
5a and 75b are formed, and the output of the HST type transmission H can be steplessly shifted forward and backward by operating forward and backward along the main shift grooves 75a and 75b. A substantially central position before and after the main transmission grooves 75a and 75b is a neutral position where the traveling transmission lever 54 moves forward and backward, and a sub transmission groove 75c connecting the main transmission grooves 75a and 75b is formed at this position. When the traveling speed change lever 54 is operated left and right along the auxiliary speed change groove 75c, the auxiliary speed change in the transmission case T is switched, and the right side is the low-speed work position and the left side is the high-speed work position.

Therefore, by operating the traveling speed change lever 54 back and forth in the right main speed change groove 75b, the main speed can be steplessly changed in the forward / reverse driving force at the low-speed work position where the sub-speed is switched to low speed. is there. Similarly, by operating back and forth along the left main transmission groove 75a, the traveling speed can be further main shifted at the high speed working position of the sub transmission.

The interval between the main transmission grooves 75a and 75b behind the sub transmission groove 75c is wider than the interval between the main transmission grooves 75a and 75b before the position of the sub transmission groove 75c.
That is, a step in the left-right direction is provided at the neutral position of both main transmission grooves 75a and 75b. Further, the abutment pieces 75d are respectively provided inside the main transmission grooves 75a and 75b (reverse operation range) near the sub transmission groove 75c at positions rearward of the sub transmission groove 75c.
-75d is formed.

Therefore, from the front side of the main transmission grooves 75a and 75b, that is, from the state where the forward traveling main transmission is being performed,
When the traveling speed change lever 54 is moved backward to the neutral position by guiding the traveling speed change lever 54 backward to perform the sub-speed change between the low speed and the high speed, it moves to the rear side (reverse speed change position) of the main speed change grooves 75a and 75b. It becomes a stopper so that it is not done. Also, when operating to the neutral position from the reverse shift position on the rear side of the main shift grooves 75a and 75b, the contact pieces 75d
In order to operate at the neutral position, the operation lever 54a is once operated to the left and right sides to prevent erroneous operation. Since the abutment pieces 75d and 75d serve as stoppers for the neutral position of the traveling speed change lever 54 and the left and right ends of the sub speed change groove 75c are not used as stoppers, the amount of rearward expansion of the main speed change grooves 75a and 75b can be reduced. ,
The operability is improved by making the main transmission grooves 75a and 75b as linear as possible.

Further, from the neutral position of the forward / backward movement, the vehicle is guided to the reverse side behind the main speed change grooves 75b and 75c,
In order to guide the vehicle from the reverse position locked to 5d to the neutral position, it is necessary to operate the traveling speed change lever 54 in the left-right direction. This operation can be absorbed by the deflection of the leaf spring 69, and the speed change lever is operated at this time. The lower portion 54b and the rotation support 66 are not rotated, and are in a play range where no force is applied to the auxiliary transmission mechanism in the transmission case T. Therefore, it is possible to eliminate the problem that the gears of the sub-transmission are disengaged due to an erroneous operation, or the gears are easily meshed to cause tooth loss.

The connecting member provided with the left and right play of the traveling speed change lever 54 is not limited to the leaf spring 69. The operation lever 54a and the lower portion 54b of the speed change lever are simply adjusted to some extent using bolts or pins. Although play can be provided with a simple structure by connecting with a play, a configuration in which the traveling speed change lever 54 is divided into two parts vertically and connected by a leaf spring 69 is more preferable because of the reaction force of the leaf spring 69. Can be guided along the side surface of the guide groove 75, and the operation rod 54a does not rattle and the operation feeling is good.

Next, the structure of the clutch levers 58 and 59 will be described. As shown in FIGS. 8 and 9, a travel switching operation link mechanism 76 is connected to a lower portion protruding below the rotation fulcrum of the left traveling clutch lever 58, and travels via the travel switching operation link mechanism 76. The parking operation arm 77 that operates a parking brake in the transmission case T, which is a stop switching mechanism, and the traveling operation shaft 32 that is interlocked with the traveling clutch are interlockingly connected. A rotation operation is transmitted to a middle part of the travel switching operation link mechanism 76 as a rotation operation to a rotation shaft 78 having a left and right axis center and provided horizontally below the middle part of the handle frame 4. The rotating shaft 7
One of the two arms protruding forward from 8 is pivotally connected to an arm 81 fixed to the rear end of the traveling operation shaft 32 via a rod 79 and a buffer spring 80. Further, a parking operation arm 77 is interlockingly connected to the other arm 82 projecting from the rotation shaft 78 via a link mechanism. The parking operation arm 77 is urged forward by the operation spring 83 to operate the parking brake, and the traveling switching operation link mechanism 76 is pulled in accordance with the urging force of the buffer spring 80, thereby moving the traveling clutch lever 58 in FIG. Is rotated upward as indicated by the two-dot chain line.

Further, a contact plate 8 is provided at the end of the rotation shaft 78.
4 is protruded upward, rotates with the rotation of the rotation shaft 78, and can contact the sensing portion of the engine start first switch 85 disposed forward on the rotation shaft 78. I have.

As shown in FIGS. 9 and 10, a boss 90 is loosely fitted to the right end of the rotating shaft 78.
Is interposed in the middle of a snow removing clutch operating link mechanism 91 interlocked with the lower end of the right work clutch lever 59, and constitutes one rotation fulcrum.

Further, the rotating shaft 78 immediately to the left of the boss 90 is provided.
An engagement release pin 104 as a release member is fixedly provided on the upper side, and the engagement release pin 104 protrudes in the radial direction of the rotation shaft 78, and an end of the engagement release pin 104 is apart from the outer peripheral surface of the boss 90 by a predetermined distance. It is bent toward the boss 90 at the position. The engagement release pin 10
Reference numeral 4 denotes a rotation operation together with the rotation shaft 78, and a gripping operation position of the traveling clutch lever 58 on the left side.
The outer end of the boss 90 is located in front of the outer peripheral surface of the boss 90, and the position between the outer end of the engagement release pin 104 and the outer peripheral surface of the boss 90 at this position is a lock position of a lock mechanism described later.

Further, a contact plate 92 is attached to the right end of the boss 90.
The boss 90 is rotated in response to the operation of the work clutch lever 59, and can contact the sensing portion of the engine start second switch 93 disposed above and in front of the boss 90.

The upper and lower central portions of a rotation arm 96 are pivotally supported by a support shaft 95 having a shaft center on the left and right in front of the boss 90, and directly below the support shaft 95 of the rotation arm 96. An interlocking pin 98 is fixedly connected to the boss 90 via two interlocking arms 99 and 100.
The rotation arm 96 is rotatable in conjunction with the rotation of 0. A rod 97 is pivotally connected to the upper part of the rotating arm 96, and is connected to the rear end of the snow removing rotating operation shaft 36 via the return spring 102 and the arm 103 to form a link mechanism 91 for operating a snow removing clutch. .

The snow removing clutch operating link mechanism 91 is pulled by the biasing force of the return spring 102, and the work latch lever 59 is rotated upward to be held at the disengaged position of the snow removing clutch. When the gripping operation of the work clutch lever 59 and the handle portion is performed against the urging force of the return spring 102, the turning arm 96 turns, but the turning arm 96 at this position exceeds the dead point. Due to the urging force of the return spring 102, the force for gripping the work clutch lever 59 is small and the operability is improved.

The lock mechanism is interposed in the snow removing clutch operating link mechanism 91 itself so as to reduce the number of parts as much as possible. That is, a front portion of an engaging body 89 having a pointed rear end serving as a lock mechanism is pivotally supported below the rotating arm 96, and the engaging body 89 extends toward the outer peripheral surface of the boss 90. An upper biasing spring 88 is interposed between the intermediate portion of the engaging body 89 and the upper part of the rotating arm 96 to urge the rear portion of the engaging body 89 upward to abut the engagement release pin 104 from below. ing. The disengagement pin 104 rotates in accordance with the operation of the traveling traveling clutch lever 58 so that the engaging body 89 is in the unlocked position below the boss 90 and the engaged portion on the front upper portion of the outer peripheral surface of the boss 90. It can be moved to and from a lock position inserted into the part.

On the other hand, as shown in FIG. 11, the starting electric circuit 110 is arranged such that the engine starting first switch 85, the engine starting second switch 93 and the relay 114
Are connected in series, and a contact 115a of the relay 115 is a relay 112 for driving a starter motor 111.
The contact 112 a of the relay 112 is connected to the starter motor 111. The relay 114 is a switch 11 for detecting a closed position of a cover that can open and close the snow removing section.
3 is connected.

In such a configuration, when the upper and lower clutch levers 58 and 59 are released from the gripping position, the traveling drive clutch and the snow removal drive clutch are both disengaged, and the parking brake is actuated to cause the body of the vehicle to move. Has been stopped. At this time, both the engine start first switch 85 and the engine start second switch 93 are turned off.
N. When the shooter cover of the snow removing section is opened, cleaning becomes possible. When the shooter cover is closed, the switch 113 is turned on, the relay 114 is turned on, and the contact point 114a is closed.

When the key switch 116 is turned on in the starting position in this manner, the first engine start switch 85, the second engine start switch 93, and the contact 114a
Is closed, the relay 115 is turned on, the contact 115a is closed, and the relay 112 is turned on.
12a is closed, the starter 111 is driven, and the engine can be started. However, the engine start first switch 85 and the engine start second switch 9
3. If any of the switches 113 is open, the engine cannot be started. Therefore, in order to start the engine E, it is necessary to close the shooter cover without operating both clutch levers 58 and 59, so that erroneous operation is prevented.

A traveling clutch lever 58 for traveling is provided.
By operating the steering wheel and the handle, the traveling clutch is engaged, the parking brake is released, and the aircraft advances. Further, by operating the work clutch lever 59 and the handle portion in a gripped state, the snow removal drive clutch is engaged and the snow removal part D is driven, and the snow removal work is started.

At this time, the boss 9
0 Lock release position below the outer peripheral surface (two-dot chain line 8 in FIG. 10)
9 '), the rear upper portion of the pointed engagement body 89 is engaged in the engaged portion between the engagement release pin 104 and the outer peripheral surface of the boss 99, and the rotation of the rotation arm 96 is locked. Is done. That is, the snow removing clutch actuating link mechanism 91 is locked at the position where the work latch lever 59 is pivoted downward, the snow removing part D is held in a driven state, and the snow removing operation is continued even if the operator releases his right hand. The operation of the other side clutch lever 55, the traveling speed change lever 54, and the like can be performed. That is, the traveling clutch lever 58 and the work latch lever 59 are pivoted downward,
It is held at the (ON) position.

When the grip of the traveling clutch lever 58 is released from this state, the traveling clutch lever 58 is pivoted upward, and the pivot shaft 78 is pivoted downward with the disengagement pin 104 as shown by the arrow in FIG. , The outer end of the engagement release pin 104 is
Is pushed downward, the engagement is released, and the lock of the rotating arm 96, that is, the link mechanism 91 for operating the snow removal clutch is released, the traveling drive clutch and the snow removal drive clutch are disengaged substantially simultaneously, and the traveling drive and the snow removal section D Drive and stop. That is, it functions as a deadman clutch lever.

In this manner, the snow removing clutch actuating link mechanism 91 is provided with the engaging body 89 serving as a locking mechanism and the engaged portion, and a special engaging member is provided on the machine A side to constitute the locking mechanism. Instead, it has a configuration in which the number of parts is reduced as much as possible and the cost is reduced. Further, since the engagement release pin 104 constituting the lock mechanism is linked to the operation of the traveling traveling clutch lever 58 via the rotating shaft 78 and also serves as a deadman clutch lever, a separate deadman clutch lever is provided. There is no need, and the configuration of the operation unit C is kept simple.

When the snow removal drive is stopped, the power transmission is released, and the rotation of the auger pulley 25 for transmitting the drive to the snow removal section D can be braked, so that the stop operation is ensured, and the auger 26 and the blower are stopped. Idling snow chute 7
There is no such a problem that snow throwing is continued for a while.

[0051]

As described above, the present invention has the following advantages. That is, as in claim 1, in a working machine in which a traveling clutch lever and a working clutch lever are arranged in an operation unit, a release member for the working clutch lever is provided on a rotating shaft interlocked with a base of the traveling clutch lever, The work clutch lever and the work clutch lever are turned on by interlockingly connecting the engagement body to the work clutch lever.
Sometimes, since the engagement body is configured to be engaged with the release member, if the traveling clutch lever is kept ON, the traveling device and the working machine are driven even when the hand that operates the work clutch is released. It can be held and other operations such as running speed change can be performed with the released hand. In this way, in a simple configuration, the traveling clutch lever can also function as a so-called deadman clutch lever that holds the work clutch lever in the ON position, so that the operation unit can be kept simple and the cost can be reduced. The operability can be improved, and the operation becomes easier.

According to a second aspect of the present invention, in a working machine in which a traveling clutch lever and a working clutch lever are arranged in an operating portion, switches for detecting operating positions of the two clutch levers are provided, and the switches are connected to an engine starting circuit. And the engine can be started when both clutch levers are off, so the only way to start the engine is when both clutch levers are off.
It was no longer started when the engine was started, nor was the snow removal section driven.

Further, as set forth in claim 3, the machine is mounted on a traveling device, a power unit such as an engine and a transmission mechanism is arranged in the machine, and a working unit is arranged in a front part of the machine. In the working machine, a belt tension type clutch mechanism for connecting and disconnecting power transmission to the working machine is provided, and a holding plate is attached to the tension arm so that the position can be adjusted.When the clutch mechanism is engaged, tension is applied to the belt by a tension roller. Power can be transmitted by applying it, and conversely, when the clutch mechanism is disengaged, belt tension is eliminated and power transmission is released, and the belt and the pulley on the work machine side can be braked by the tension plate, making up the work machine The auger or the like can be stopped without being idle for a while, thereby improving workability.

Further, as set forth in claim 4, the machine is mounted on a traveling device, a working section is arranged in front of the machine, an operation section is arranged in a rear section, and a traveling section provided in the operation section. In a work machine in which a shift lever is rotatably supported back and forth and left and right to enable a main shift and a sub-shift operation, the shift lever is divided into upper and lower parts, and the upper part of the shift lever is provided by a connecting member having flexibility in left and right. The upper and lower transmission levers are provided with a stopper that regulates the amount of left and right deflection at the lower part of the transmission lever. The sub-shift operation can be performed only after the tilting operation, and the shift operation is reliably performed without performing the other operation during one operation to the left, right, or front and rear.

[Brief description of the drawings]

FIG. 1 is an overall side view of a snow blower.

FIG. 2 is a front view, partly in section, showing the configuration of a traveling clutch.

FIG. 3 is a front view showing a configuration of a clutch for snow removal.

FIG. 4 is a rear view showing a configuration of a shift lever.

FIG. 5 is a side view of the same.

FIG. 6 is a plan view and a partial sectional view of the same.

FIG. 7 is a plan view showing a shape of a groove for guiding a shift lever.

FIG. 8 is a side view showing a link mechanism interlocked with a traveling clutch lever.

FIG. 9 is a rear view showing a link mechanism interlocked with left and right clutch levers.

FIG. 10 is a right side view in the traveling direction of a lock mechanism that locks the snow removing clutch lever in a state of being rotated downward.

FIG. 11 is a circuit diagram showing a starting electric circuit of the engine.

[Explanation of symbols]

 A Main unit C Operation section D Snow removal section E Engine 58/59 Clutch lever 54 Travel speed change lever 54a Operation rod 54b Lower speed change lever 75a / 75b Main speed change groove 75c Sub speed change groove 76 Travel switching operation link mechanism 78 Rotating shaft 85 Engine start First switch 89 Engagement body 90 Boss 91 Link mechanism for operating snow removing clutch 93 Engine start second switch 104 Lock release pin

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) F16H 7/12 F16H 7/12 C (72) Inventor Toshihiko Yamane 428 Enami, Okayama City F term (reference) 2B083 BA01 BA11 BA15 DA02 EA15 HA22 HA52 HA57 3D040 AA05 AA13 AA23 AB08 AC53 AC55 AC58 AC63 AD14 3J049 AA01 AB05 BA05 BA07 BD03 BH20 CA06 3J056 AA70 BA06 BB45 BD15 BD34 DA02 DA07 DA13 GA22

Claims (4)

[Claims] 1. A work machine in which a travel clutch lever and a work clutch lever are arranged on an operation unit, wherein a release member for the work clutch lever is provided on a rotating shaft interlocked with a base of the travel clutch lever. An operating member of the working machine, wherein the engaging member is interlockingly connected to the engaging member so that the engaging member is engaged with the release member when the traveling clutch lever and the work clutch lever are ON. 2. A work machine in which a traveling clutch lever and a work clutch lever are arranged on an operation unit, wherein a switch for detecting an operation position of each of the two clutch levers is provided,
An operating unit for a working machine, wherein the switch is connected to an engine starting circuit, and the engine can be started when both clutch levers are OFF. 3. A work machine in which the machine is mounted on a traveling device, a power unit such as an engine and a transmission mechanism is arranged in the machine, and a work unit is arranged in front of the machine. A belt tension type clutch mechanism that connects and disconnects the power transmission of
An operation unit for a working machine, wherein a holding plate is attached to the tension arm so as to be adjustable in position. 4. The machine is mounted on a traveling device, a working unit is disposed in front of the traveling unit, and an operation unit is disposed in a rear portion of the traveling unit. In a working machine which is rotatably supported to enable a main speed change and a sub speed change operation, the speed change lever is divided into upper and lower portions, and the upper portion of the speed change lever is flexibly connected to the left and right by a connecting member having left and right flexibility. An operating section of the working machine, wherein a stopper for regulating the amount of deflection of the upper portion of the shift lever in the right and left directions is provided below the shift lever.