JP2008228711A - Walking type working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain a parking brake device that can soundly brake the travelling wheel simply only by allowing the nails to engage to the wheel-driving chain and can be economically practiced with a reduced number of parts. <P>SOLUTION: In a walking type working machine wherein an operation lever (7) for travelling is set from the rear of the body (1) equipped with the travelling wheel (2) backwards, the rotation power of the engine (E) set on the body is transmitted via the travelling transmission case (8) and the chain case to the travelling wheel (2), a parking brake unit (15) including the engaging nails (16) that are engaged to the wheel-driving chain inside the chain case (9) to stop the rotation of the wheel-driving chain (13), and a switching actuation mechanisms (17, 18) for switching the nails (16) between the state of beeing engaged to the wheel-driving chain (13) and the state of being disengaged is provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a walking work machine such as a binder.

  2. Description of the Related Art In recent years, walking-type work machines such as binders are also required to be provided with a parking brake in order to prevent the vehicle body from moving toward a sloping downward side due to the weight of the vehicle body when parking on an inclined ground. .

As a parking brake for such a walk-type work machine, a parking brake that brakes the rotation of the traveling wheel is provided at a lateral position of the transmission case on a traveling output shaft that protrudes from the transmission case and transmits the traveling power to the chain case. (See, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-127669

  The travel output shaft that protrudes from the transmission case extends through the chain case to the outer side opposite to the transmission case in order to provide a parking brake device. Since the parking brake device is provided at the extended portion of the travel output shaft that is extended, the configuration is not simple, and the brake device protrudes greatly outside the chain case, and the brake cover, brake drum, Many parts such as brake cams and brake arms are required, and there is a problem that is difficult to implement at low cost. Further, since the parking brake is a friction type parking brake, if the vehicle is driven without completely releasing the parking brake, there is a problem in that the parking brake is prematurely worn or damaged, resulting in a decrease in durability. Moreover, if the parking brake is not applied sufficiently and left on an inclined ground in a half-brake state, there is a drawback that the airframe moves unknowingly due to its own weight.

  It is an object of the present invention to implement a parking brake device that can be implemented at a low cost with a simple configuration and is reliable in operation.

The present invention has taken the following technical means in order to solve the above-described problems.
That is, the invention according to claim 1 is provided with a walking operation handle (7) from the rear part of the vehicle body (1) having the traveling wheels (2) to the rear, and the engine (E) provided on the vehicle body (1). In the walking type work machine configured to transmit the rotational power to the traveling wheel (2) through the traveling mission case (8) and the chain case (9), the wheel drive chain (13) in the chain case (9) is provided. An engaging claw (16) for engaging and stopping the rotation of the wheel drive chain (13), and a switching operation for switching the engagement claw (16) between an engaged state and a disengaged state with respect to the wheel drive chain (13). A walking work machine is provided, which is provided with a parking brake device (15) including a mechanism (17, 18).

  Since the parking brake device 15 that brakes the rotation of the traveling wheel 2 is based on the configuration of the engaging claw 16 that engages with the wheel drive chain 13 in the chain case 9 to stop the rotation, the parking brake device 15 has a simple configuration. It can be stopped reliably. In addition, since the engaging claw 16 can be provided in the chain case 9, the brake device is not exposed to the outside of the chain case as in the conventional case, and the structure is simple and compact, and the number of parts is small. It can be implemented at low cost.

  According to the second aspect of the present invention, the parking brake lever (20) is disposed below the walking operation handle (7), and the parking brake lever (20) is disposed on the grip portion (7a) side of the walking operation handle (7). The engagement claw (16) is engaged with the wheel drive chain (13) by pulling backward toward the vehicle, and the engagement claw (16) is moved to the wheel by pushing the parking brake lever (20) forward. The walking work machine according to claim 1, wherein the parking brake lever (20) and the switching operation mechanism (17, 18) are connected so as to be separated from the drive chain (13).

  When the parking brake lever 20 is pulled backward, the engagement claw 16 is engaged with the wheel drive chain 13 by the switching operation mechanisms 17 and 18, and the parking brake is applied. When the parking brake lever 20 is pushed forward, the parking brake is released. Is done. Thus, when the parking brake lever 20 is pulled backward, the parking brake lever 20 is pulled to a position near the lower part of the grip 7a of the walking operation handle 7 so as to obstruct the operator's walking operation. Is done. On the other hand, at the time of walking driving, the parking brake lever 20 can be pushed forward to a position where it does not get in the way and the parking brake is released before driving, and forgetting to release the parking brake is reduced.

  According to the first aspect of the present invention, the traveling wheel 2 can be reliably braked with a simple configuration in which the engagement claw 16 is engaged with the wheel drive chain 13, and the engagement claw 16 has a chain case. Therefore, it is not necessary to expose the parking brake device to the outside of the chain case 9 as in the prior art, and a simple and compact parking brake device can be realized and provided at low cost. . In addition, since the half-brake state is less likely to occur compared to the case of using a friction brake, the braking state and the non-braking state of the traveling wheel 2 are clear, and the parking brake device starts with the half-brake state. It is difficult to damage the material, and durability can be improved. In addition, it is possible to reduce the problem that the vehicle body is moved by being left on an inclined ground in a half brake state, and the safety can be improved.

  According to the second aspect of the present invention, the parking brake lever 20 interferes with the walking operation of the operator when the parking brake lever 20 is pulled backward while having the effect of the first aspect of the invention. This will hinder the operation of the operator and urge the user not to perform the starting operation, and push the parking brake lever 20 forward without disturbing the vehicle during walking. Thus, the vehicle can be started after the parking brake is released, and the forgetting to release the parking brake can be prevented in advance and each part can be prevented from being damaged.

Embodiments of the present invention will be specifically described below with reference to the drawings.
FIG. 1 shows, as an example of a walking type work machine, a binder that binds while cutting napped grains in a field, and this binder B is a pair of left and right traveling wheels (rubber tires) at an intermediate portion in the front-rear direction of the vehicle body 1. ) 2 and 2, a cutting and binding unit 3 for cutting, binding and releasing the napped grains is provided in front of the traveling wheels 2 and 2, and the traveling clutch lever 4 is disposed behind the traveling wheel 2. A walking operation handle 7 having operating tools such as a side clutch lever 5 and a cutting clutch lever 6 is provided so as to project rearward from the vehicle body 1. An engine E is mounted on the rear portion of the vehicle body 1. The rotational power from the engine E is interlocked to transmit power to the traveling wheels 2 via the traveling mission case 8 and the chain case 9. The chain case 9 is fixed to a drive sprocket 11 that is integrally fitted to a traveling output shaft 10 that protrudes from the traveling mission case 8, and an intermediate shaft 2b that is loosely fitted between the left and right axles 2a and 2a of the traveling wheel 2. The driven sprocket 12 and the wheel drive chain 13 that is turned between the two sprockets 11 and 12 are internally provided. Ball clutches 2c, 2c are provided between the intermediate shaft 2b and the left and right axles 2a, 2a so that the ball clutches 2c, 2c can be disconnected by operating the left and right side clutch levers 5, 5. .

  The parking brake device 15 for braking the rotation of the traveling wheel 2 is engaged with a wheel drive chain 13 to lock the rotation of the wheel drive chain, and the engagement claw 16 is connected to the wheel drive chain 13. Switch operating mechanisms 17, 18, etc. for switching between a braking state to be engaged with the vehicle and a brake releasing state to be disengaged from the wheel drive chain 13. The parking brake lever 20 provided below the operation handle 7 is connected via an operation interlocking mechanism. Linked together.

  The engaging claw 16 is mounted on the interior of the chain case 9, and is fixed to the rotating shaft 17 rotatably mounted on the left and right side walls of the chain case 9. By engaging the engaging claw operating arm 18 fixed to the outer end of the wheel with a return spring 19, the engaging claw 16 engages with the wheel drive chain 13 to lock the rotation of the wheel drive chain 13. It is configured to be able to switch between a braking state and a braking release state in which the vehicle is released from the wheel drive chain 13 to release the lock.

  The parking brake lever 20 is connected at its base end to a swing operation arm 21 that can swing around the support shaft 31 of the stand 30, and the swing operation arm 21 operates the engagement claw via a tension spring 22. It is connected to the arm 18. When the parking brake device 15 is switched to the brake operating state, the brake lever 20 is pulled backward, and the grip operation portion of the brake lever 20 reaches near the position below the grip portion 7a of the operation handle 7. When the pulling operation is performed, the engagement claw 16 drives the wheel via the swing operation arm 21, the operation interlocking mechanism using the tension spring 22, and the switching operation mechanism such as the rotation shaft 17, the engagement claw operation arm 18, and the return spring 19. When the parking brake device 15 is switched to the brake release state, it can be engaged with the chain 13 and the engagement claw 16 is driven by pushing the brake lever 20 forward. It is set as the structure which can be made to detach | leave from 13 and can be switched to a brake release state.

  The tension spring 22 spans between the pin P1 at the rear end of the swing operation arm 21 and the pin Q at the rear end of the engagement claw operating arm 18, and the rod front end (base end) of the parking brake lever 20 is The swing operation arm 21 is pivotally attached to the pin P2 at the front end. Accordingly, when the brake lever 20 is pulled rearward, the swing operation arm 21 is raised and rotated, and the tension spring 22 is pulled and exceeds the fulcrum, and the engagement claw operating arm 18 and the engagement claw 16 are pulled by the tension force of this spring. Is rotated downward, and the engaging claw 16 engages with the drive chain 13 to be locked.

  By connecting the swing operation arm and the engaging claw operation arm via a tension spring, the swing operation arm can be easily moved beyond the fulcrum, and the operation is ensured. Also, by providing a return spring on the engaging claw operating arm, it is possible to ensure the return when the brake is released.

  The stand 30 is configured to swing up and down around a support shaft 31, and the support shaft 31 is supported by a support bracket 32 provided at the lower part of the chain case 9, and the traveling wheel 2, the engine E, It is set near the middle of (the rear of the center of gravity of the binder). When the stand is stored, the arrangement is made so that the stand 30a is positioned below the chain 9 and below the engine E behind the chain case. When the stand is stowed, the foot of the stand is located below the engine, so when the stand stands up, the stand can be easily raised even with the operation handle held, and the stand is stored under the chain case. It can be configured in a narrow space.

  The traveling clutch lever 4 is configured to be swingable in the front-rear direction. The clutch is engaged by the operation of the clutch cam 24 by swinging forward from the neutral position, and the vehicle body moves forward, swinging backward from the neutral position. By operation, the clutch is engaged via the clutch cam 24, and the machine body moves backward. The clutch cam 24 rotates counterclockwise regardless of whether the clutch lever 4 is operated forward or backward. A restraining member 25 that restrains the on / off operation of the travel clutch lever is provided near the travel clutch lever 4 and is configured to be rotatable about the axis X. And this check member 25 connects the engaging claw operating arm 18 and the check member 25 to the interlocking wire so that it operates in conjunction with the movement of the engaging claw operating arm 18 that engages and disengages the engaging claw 16 of the parking brake. 27, etc., and linked so that the travel clutch is not engaged when the brake is activated. In other words, when the parking brake lever 20 is operated to the brake “on” position, the check member 25 rotates from the illustrated phantom line to the actual state position, and is clutched by the check pin 26 protruding from the check member 25. The cam 24 is prevented from rotating.

Binder side view Same as above Cross sectional view of the main part Expanded plan sectional view of the main part Side view of the main part Side view for explanation showing a related configuration of the traveling clutch lever and the check member Side view for explaining the main part Side view for explaining the main part

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car body 2 Traveling wheel 7 Walking operation handle 8 Traveling mission case 9 Chain case 13 Wheel drive chain 15 Parking brake device 16 Engaging claw 17 Rotating shaft 18 Engaging claw actuating arm 20 Parking brake lever 21 Swinging operation arm 22 Tension Spring E engine

Claims (2)

  A walking operation handle (7) is provided from the rear portion of the vehicle body (1) having the traveling wheel (2) to the rear, and the rotational power of the engine (E) provided on the vehicle body (1) is transmitted to the traveling mission case (8) and In the walking work machine configured to transmit to the traveling wheel (2) via the chain case (9), the wheel drive chain (13) is engaged with the wheel drive chain (13) inside the chain case (9). ) And the switching operation mechanism (17, 18) for switching the engagement claw (16) between the engagement state and the disengagement state with respect to the wheel drive chain (13). A walking type work machine provided with a brake device (15).   The parking brake lever (20) is disposed below the walking operation handle (7), and the parking brake lever (20) is pulled backward toward the grip portion (7a) of the walking operation handle (7). Thus, the engaging claw (16) is engaged with the wheel drive chain (13), and the engaging claw (16) is detached from the wheel drive chain (13) by pushing the parking brake lever (20) forward. The walk type work machine according to claim 1, wherein the parking brake lever (20) and the switching operation mechanism (17, 18) are connected to each other.

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