JPH1194051A - Steering device of working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve turning operability. SOLUTION: A front wheel diff-lock device 15 is provided, capable of switching the state to the lock state where right and left driving traveling front wheels 5 are driven at constant speed by stopping the operation of a differential gear 14 interposed in a transmission system to right and left driving traveling front wheels 5 and the lock releasing state where the operation of the differential gear 14 is allowed. Moreover, a diff-lock interlocking means is provided, for switching the front wheel diff-lock device 15 into the locking state by interlocking with the steering operation in relation to the driving traveling front wheels 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering operation device for a working machine such as a rice transplanter for performing paddy work. More specifically, the invention relates to a differential system interposed in a transmission system for driving front wheels for left and right steering. The present invention relates to a device provided with a front wheel differential lock device that can be operated to switch between a locked state in which the operation of the device is stopped and the left and right driving front wheels are driven at a constant speed and an unlocked state in which the operation of the differential device is permitted.

[0002]

2. Description of the Related Art When turning on a headland or the like in wetland work, the steering wheel is operated to steer the front wheels, and at the same time, the left and right front wheels are driven together to secure sufficient thrust. This is performed by switching the front wheel differential lock device to the locked state.

Conventionally, an operating tool, such as a differential lock pedal, for switching the front wheel differential lock device is provided, and each time the vehicle turns, the operating tool is operated to switch the front wheel differential lock device to the locked state.

[0004]

Therefore, according to the above-mentioned prior art, each time the vehicle turns, the operating tools must be operated one by one to switch the front wheel differential lock device to the locked state. The operability was low.

An object of the present invention is to improve turning operability.

[0006]

The features, functions and effects of the first aspect of the present invention are as follows.

[Characteristics] The locked state in which the operation of the differential device interposed in the transmission system to the left and right driving front driving wheels is stopped to drive the left and right driving front wheels at a constant speed, and the differential device In a working machine provided with a front wheel differential lock device operable to switch to an unlocked state allowing operation of the
Differential lock interlocking means is provided for switching the front wheel differential lock device to a locked state in conjunction with a steering operation on the front wheels for driving and traveling.

According to the first aspect of the invention, a differential lock interlocking means is provided to automatically switch the front wheel differential lock device to a locked state in conjunction with the steering operation. When turning while the differential lock device is switched to the locked state, no special operation for switching the front wheel differential lock device to the locked state is required.

[Effects] Therefore, according to the first aspect of the present invention, reliable turning with the front wheel differential lock device switched to the locked state can be performed with good operability.

According to the second aspect of the present invention, the features, actions,
The effects are as follows.

[Features] In the features of the first invention,
To configure the differential lock interlocking means, an interlocking arm that rotates forward in conjunction with the left steering operation of the pitman arm and reversely rotates in conjunction with the right steering operation is provided. An interlocking mechanism for switching the front wheel differential lock device to the locked state in conjunction with the lock mechanism is provided.

According to the second aspect of the present invention, when the steering operation is performed to the left, the interlocking arm rotates forward and the front wheel differential lock device is switched to the locked state via the linkage mechanism. The front wheel differential lock device is switched to the locked state by the arm rotating in the reverse direction via the linkage mechanism. Therefore, the front wheel differential lock device can be turned at the time of turning regardless of the right or left turning direction without performing a special selection operation. Can be switched to the locked state.

[Effects] Therefore, according to the second aspect of the present invention, both the left turn and the right turn by switching the front wheel differential lock device to the locked state can be performed with good operability.

According to the third aspect of the present invention, the features, actions,
The effects are as follows.

[Features] In the features of the second invention,
To configure the link mechanism, a relay link that switches the front wheel differential lock device to a locked state by swinging in one direction is provided, and the relay link is associated with forward rotation of the interlocking arm in a state where the interlocking arm is allowed to rotate in the reverse direction. The first link swings the relay link in one direction, and the second link swings the relay link in one direction with the reverse rotation of the interlocking arm while allowing the interlocking arm to rotate forward.

According to the third aspect of the present invention, when the interlocking arm rotates forward with the steering operation to the left, the relay link is pivoted in one direction via the first link, and the front wheel differential lock device is turned on. On the other hand, when the interlocking arm is rotated in reverse with the steering operation to the right, the relay link is swinged in one direction via the second link, and the front wheel differential lock is switched to the locked state. In addition, since the link mechanism is constituted by the link, the link mechanism can be made strong.

[Effect] Therefore, according to the third aspect of the present invention, the differential lock interlocking means can be made excellent in durability.

According to the fourth aspect of the present invention, the features, actions,
The effects are as follows.

[Features] In the features of the second invention,
To configure the link mechanism, an interlocking wire is provided that is connected to the front wheel differential lock device at one end and is pulled to switch the front wheel differential lock device to a locked state, and one of the forked other ends of the interlocking wire is provided. The point is that the other side is connected to the interlocking arm so as to be pulled by the forward rotation of the interlocking arm, and the other side is connected to the interlocking arm so as to be pulled by the reverse rotation of the interlocking arm.

According to the fourth aspect of the invention, when the interlocking arm rotates forward with the steering operation to the left, the other forked end is pulled while the other forked other end is loosened. The front wheel differential lock device is switched to the locked state by the pulling operation of the interlocking wire, and when the interlocking arm is rotated in reverse by the steering operation to the right, the other end of one forked shape is slackened while the other end is loosened. The front wheel differential lock device is switched to the locked state by the pulling operation of the forked bifurcated end and the pulling operation of the interlocking wire. Since the linking mechanism is formed of a wire, the linking mechanism is simple in structure and inexpensive. Can be configured.

[Effect] Therefore, according to the fourth aspect of the present invention, the differential lock interlocking means can be constructed simply and inexpensively.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, a riding type rice transplanter representing a paddy field working machine, which is an example of a working machine, has a plurality of planting-types at the rear of a riding type self-propelled body 1. As shown in FIG. Planting device 2
(The drawing shows a six-row planting type) via a link mechanism 3 and a hydraulic cylinder 4 so as to be operable up and down.

The self-propelled body 1 has an engine 8 and a boarding operation section 9 mounted on a body frame 7 having a pair of left and right driving front wheels 5 for steering and a pair of left and right driving wheels 6 after driving. It is configured. The drive front wheels 5 are used for traveling
Airframe 7 via transmission case 10 for planting
After driving, the wheels 6 are mounted on the axle case 11.
And is supported by the body frame 7 via the

The engine power is transmitted between the engine 8 and the transmission case 10 in the transmission case 1.
0 is provided with a belt-type continuously variable transmission 12 for transmitting the main transmission to the transmission mechanism in the transmission case 10.
The differential between the transmission mechanism and the differential device 14 interposed in the transmission system to the front driving wheel 5 is different from the locked state in which the operation of the differential device 14 is stopped and the left and right driving front wheels 5 are driven at a constant speed. A front wheel differential lock device 15 operable to switch between an unlocked state allowing operation of the moving device 14 and
It is configured to drive the driving front wheels 5. On the other hand, it is configured to transmit power to a transmission system to the driven wheels 6 in the axle case 11 via a transmission shaft 16 interlocked with a power take-out shaft interlocked with a power transmission mechanism in the transmission case 10, As shown in FIG. 3, clutch / brake 17L, 17R for stopping the transmission and then applying a brake are interposed in each of the transmission systems to the left and right driven wheels 6 in the axle case 11 as shown in FIG.

The on-board driving section 9 includes a driver's seat 18, a steering handle 19 for steering the front wheels 5 for driving, and a front-wheel differential lock device 15 from an unlocked state to a locked state when depressed. And the left and right steering pedals 22L, which actuate the corresponding clutch / brake 17L, 17R by being depressed and operated in conjunction with the clutch / brake 17L, 17R via the rods 21L, 21R. 22R.

The planting apparatus 2 comprises a seedling rest 23 which can be driven and moved by a set stroke in the left-right direction,
In conjunction with the movement of the seedling 3, the mat seedlings on the seedling stand 23 are taken out by the planting unit amount and planted in the field. And a grounding float 25 that
The seedling planting mechanism 24 is mounted two by two on each of a plurality of planting cases 26 arranged at an interval in the left-right direction, and each planting case 26 is provided with power for the seedling planting mechanism 24. A planting clutch 27 for interrupting transmission is provided.
Each of the planting clutches 27 is linked to the clutch lever 28 via a wire, so that the clutch lever 2
The operation is switched on and off by the operation 8. The clutch lever 28 is connected to the driver's seat 1 of the boarding driver 9.
8 is vertically swingable so as to penetrate the rear wheel fender 29 located on the lateral side of 8, and the lower limit of the vertical swing range is the entering position, and the upper limit is the turning position.

As shown in FIG. 3, the steering operating device is a brake interlocking means for operating one of the clutch brakes 17L and 17R inside the turning in conjunction with the steering operation on the front wheels 5 for driving. And the driving front wheels 5
Front differential lock device 1 in conjunction with a steering operation on
5 is provided with a differential lock interlocking means for switching the lock state to a lock state.

The brake interlocking means performs a braking operation on the left rod 21L by rotating forward around the vertical axis P1 in conjunction with the left steering operation of the pitman arm 30, and at the same time, the right steering of the pitman arm 30. An interlocking arm 31 is provided which performs a braking operation of the right rod 21R by being reversely rotated around the vertical axis P1 in conjunction with the operation. Then, the steering pedals 22L, 22
The interlocking means between R and the rods 21L and 21R is operated by depressing the steering pedals 22L and 22R.
1R and the steering pedals 22L, 22
This is a means for interlocking the braking operation of the rods 21L and 21R by the rotation of the interlocking arm 31 in a state where R is at the brake release position so as not to be transmitted to the steering pedals 22L and 22R. Pressing portions 33L and 33R for pressing the pressed portions 32L and 32R attached to the rods 21L and 21R in the braking direction in accordance with the depressing operation of the steering pedals 22L and 22R are connected to 22L and 22R, respectively. And the interlocking arm 31 and the rods 21L and 21R
The means for interlocking with the rod 2
1L and 21R are braked and the interlocking arm 31 is operated.
Is in the brake release position, the steering pedal 22L,
This is a means for interlocking the braking operation of the rods 21L and 21R by the depressing operation of the 22R so as not to be transmitted to the interlocking arm 31. Specifically, the interlocking arm 31 is provided with a pressed portion 34L attached to the rods 21L and 21R. Pressing portion 35 for pressing 34R in the braking direction with rotation of interlocking arm 31
L and 35R are formed. The pressed part 3
4L, 34R (that is, the rods 21L, 21R) and the pressing portions 35L, 35R (that is, the interlocking member 31) are provided between the interlocking arms 31 in a state of absorbing excessive operation of the interlocking arms 31 with respect to the rods 21L, 21R. A spring 3 for transmitting the pressing force by the rod 31 to the rods 21L and 21R
6L and 36R are interposed. That is, the rod 21
Further rotation of the interlocking arm 31 accompanying the steering operation in a state where the brakes L and 21R are operated is allowed.
Further, the left steering pedal 22L is provided with the right steering pedal 22L.
The left and right steering pedals 22 are engaged with a receiver 37 attached to
A connecting tool 38 is provided which is swingably switchable between a connecting posture for integrating the L and 22R and a disengaging posture for releasing the engagement and performing the independent operation of the left and right steering pedals 22L and 22R.

The differential lock interlocking means is provided with a link mechanism for switching the front wheel differential lock device 15 to a locked state in conjunction with the forward rotation and reverse rotation of the interlocking arm 31. The interlocking mechanism moves the interlocking arm 3 in a state where the interlocking arm 31 is allowed to rotate in the reverse direction by loosening.
A first wire 40L which is pulled by the forward rotation of the first arm to pull the differential lock pedal 20 to a locked position via a stroke absorbing spring 39L, and a state in which forward rotation of the interlocking arm 31 is allowed by loosening. The differential lock pedal 20 is pulled by the reverse rotation of the interlocking arm 31 to move the differential lock pedal 20 by a spring 39 for absorbing a stroke.
Second wire 40 pulled to lock position via R
R and the first wire 40L and the second wire 40R are both loosened to allow the differential lock pedal 20 to be depressed. Spring 39L, 39R for absorbing stroke
Focusing on the fact that the actuation amount of the interlocking arm 31 interlocked with the steering operation is larger than the actuation amount of the differential lock pedal 20 to the lock position, and the operation of the interlock arm 31 after the differential lock pedal 20 is at the lock position That is, steering is permitted. And the clutch and brake 17L,
17R takes time from the start of braking to complete braking, whereas the front wheel differential lock device 15 switches to the locked state instantaneously.
When the steering wheel 19 is operated, first, the clutch / brake 17 is operated in order to perform smooth turning by the braking operation of the clutch / brake 17L, 17R when the driver 9 is operated and the switching of the front wheel differential lock device 15 to the locked state.
The front wheel differential lock device 15 is set to switch to the locked state after the L and 17R start the braking operation.

[Another Embodiment] The linking mechanism is modified as follows. As shown in FIG. 4, a relay link 42 that swings in one direction to pull the differential lock pedal 20 to a locked position via a stroke absorbing spring 41 and a pulling tool 42 a is provided, and a reverse link of the interlocking arm 31 is provided. A first link 43L that swings the relay link 42 in one direction with the forward rotation of the interlocking arm 31 in a state where the rotation is allowed, and a relay with the reverse rotation of the interlocking arm 31 in a state where the forward rotation of the interlocking arm 31 is allowed. Link 4
2 is provided with a second link 43R for swinging the second member in one direction. Specifically, one ends of the first link 43L and the second link 43R are swingably connected to the relay link 42, and the other ends of the first link 43L and the second link 43R are turned up and down in the interlocking arm 31. The first links 43L, 43R are engaged with the pins 44L, 44R protruding from the locations opposed to each other with the axis P1 interposed therebetween so as to pull the first links 43L, 43R with the rotation of the interlocking arm 31, and the pin holes 45L formed in the first links 43L are formed. A long hole that allows reverse rotation of the interlocking arm 31,
The pin hole 45R formed in the second link 43R is
It is a long hole that allows one forward rotation.

The link mechanism is modified as follows. As shown in FIG.
The differential lock pedal 20 is moved to the locked position by being pulled by being connected to the spring 46 for absorbing the stroke.
An interlocking wire 47 is provided to be operated via the link arm 47, and one of the forked other ends 47L and 47R of the interlocking wire 47 is pulled and operated in accordance with the forward rotation of the interlocking arm 31. It is fixed to one of the opposing portions with the core P1 interposed therebetween, and the other is fixed to the other of the opposing portions so as to be pulled by the reverse rotation of the interlocking arm 31. In other words, the forward rotation of the interlocking arm 31 accompanying the pulling operation of the one forked other end 47L is allowed by the slack of the other forked other end 47R, and the interlocking with the pulling operation of the other forked other end 47R. The reverse rotation of the arm 31 is allowed by the slack of one of the two forked ends 47L. Reference numeral 48 denotes a guide wheel for guiding the movement of the interlocking wire 47.

The linkage mechanism described in the other embodiment is modified as follows. As shown in FIG. 6, the interlocking arm 31 is allowed to rotate in the reverse direction.
The bifurcated linkage 49 swings the relay link 42 in one direction with the reverse rotation of the interlocking arm 31 while allowing the relay link 42 to swing in one direction with the forward rotation of Is provided.
Specifically, one end of the bifurcated linkage 49 is connected to the linkage rod 5.
0, and is connected to the relay link 42 via
Are engaged with the pins 44L, 44R of the interlocking arm 31 so as to pull the bifurcated interlocking tool 49 as the interlocking arm 31 rotates.
The pin hole 45L formed on the other leg 49R is formed as a long hole allowing the reverse rotation of the interlocking arm 31.
R is a long hole that allows the forward rotation of the interlocking arm 31.

In the above embodiment, an example of application to a rice transplanter, that is, a paddy working machine has been described, but the present invention can be applied to various working machines.

In the above embodiment, the differential lock pedal 2
Although the front wheel differential lock device 15 is switched to the locked state by operating 0, the front wheel differential lock device 15 may be switched to the locked state by directly operating the front wheel differential lock device 15.

[Brief description of the drawings]

FIG. 1 is a side view of a riding rice transplanter.

FIG. 2 is a plan view of a riding rice transplanter.

FIG. 3 is a schematic plan view of a steering operation device.

FIG. 4 is a schematic plan view of a main part of a steering operation device showing another embodiment.

FIG. 5 is a schematic plan view of a main part of a steering operation device showing another embodiment.

FIG. 6 is a schematic plan view of a main part of a steering operation device showing another embodiment.

[Explanation of symbols]

 Reference Signs List 5 driving front wheel 14 differential device 15 front wheel differential lock device 30 pitman arm 31 interlocking arm 42 relay link 43L first link 43R second link 47 interlocking wire 47L bifurcated other end 47R bifurcated other end

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takuya Morimoto 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside Kubota Sakai Plant (72) Inventor Yasuhiro Nagata 64 Ishizukita-cho, Sakai City, Osaka Manufacturing Kubota Sakai Co., Ltd. Office (72) Inventor Naoki Matsuki 64 Ishizukitamachi, Sakai City, Osaka Prefecture Inside Kubota Sakai Factory (72) Inventor Noboru Higashio 64 Ishizukitamachi, Sakai City, Osaka Prefecture Inside Kubota Sakai Factory

Claims (4)

[Claims] 1. A locked state in which the operation of a differential device interposed in a transmission system to left and right driving front driving wheels is stopped to drive the left and right driving front wheels at a constant speed, and In a working machine provided with a front wheel differential lock device operable to switch to an unlocked state allowing operation, a differential lock interlocking means for switching the front wheel differential lock device to a locked state in conjunction with a steering operation on the driving front wheel is provided. A steering operation device for the working machine provided. 2. The differential lock interlocking means comprises:
An interlocking arm that rotates forward in conjunction with the left steering operation of the pitman arm and reverse rotates in conjunction with the right steering operation is provided, and the front wheel differential lock device is locked in conjunction with the forward and reverse rotation of this interlocking arm. 2. The steering operating device for a working machine according to claim 1, further comprising a linkage mechanism for switching between the two. 3. The link mechanism is provided with a relay link that switches the front wheel differential lock device to a locked state by swinging in one direction, and the linking arm is rotated forward in a state where the linking arm is allowed to rotate in the reverse direction. A first link for swinging the relay link in one direction with rotation, and a second link for swinging the relay link in one direction with reverse rotation of the interlocking arm while allowing the interlocking arm to rotate forward. 3. A steering operating device for a working machine according to claim 2. 4. An interlocking wire which is connected to the front wheel differential lock device at one end and is pulled to switch the front wheel differential lock device to a locked state, wherein the interlocking wire is provided at the other end of the interlocking wire. 3. The device according to claim 2, wherein one of the portions is connected to the interlocking arm so as to be pulled by the forward rotation of the interlocking arm, and the other is connected to the interlocking arm so as to be pulled by the reverse rotation of the interlocking arm. Work equipment steering operation device.