JP3083449B2 - Swivel of traveling work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning device of a traveling work machine having a sub-transmission mechanism such as a tractor and a turning traveling mechanism by an independent braking operation and a turning angle braking operation.

[0002]

2. Description of the Related Art Conventionally, when traveling while tilling work on an agricultural tractor, the traveling operation is performed by independently braking left and right rear wheel brakes in the turning direction of the fuselage to perform pivot turning, and operating the front wheel by operating a steering wheel. There is known a traveling work machine of a type in which the left and right rear wheel brakes on the turning side are operated at a turning angle in conjunction with the turning angle, and the traveling work machine is provided with an independent braking operation state and a turning angle braking operation state. In addition to providing a switching lever for performing a switching operation, a main transmission operation mechanism capable of fully controlling the traveling speed of the traveling work machine, and an auxiliary transmission lever having an auxiliary transmission lever for performing a two-stage operation of a high-speed work area and a low-speed work area. A speed change mechanism is provided, and each of the operation levers is configured and used so as to operate independently.

[0003]

Therefore, in the conventional agricultural tractor, in the operation range of the auxiliary transmission lever in which the body travels at high speed, the switching lever interlocks with the turning angle of the front wheel to apply a brake to the turning rear wheel. When the operator operates the steering wheel, if the turning angle of the front wheel is turned more than a predetermined angle, the fuselage turns at high speed with a small radius. The operator may be swung around and risky.
If this occurs due to an operation performed after each operation lever, the operator unexpectedly turns sharply, which may be dangerous.

In order to avoid such a problem, the layer of the auxiliary transmission lever on the high-speed range side is independently braked to the rear wheels regardless of whether the switching lever is on the steering angle braking operation side or the steering angle of the front wheels. The operator must operate while confirming whether the operator is on the independent braking operation side, and therefore, the operation is inefficient and the erroneous operation is liable to occur.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the above-mentioned conventional apparatus. In addition, the left and right rear wheel brakes 3 can be independently braked, and the turning angle braking operation can be performed so as to activate the rear wheel brake on the body turning side when the turning angle of the front wheel by the steering wheel operation becomes a predetermined angle or more. In the traveling work machine, a switching lever for selectively switching between the independent braking operation state and the turning angle braking operation state, and a sub-transmission lever for switching a traveling speed between a high speed side and a low speed side are provided close to the body. When the switching lever is operated to the turning angle braking operation side, the auxiliary transmission lever is switched from the high speed side to the low speed side, and when the auxiliary transmission lever is operated from the low speed side to the high speed side, the turning angle braking operation is performed. Tandem to switch the switching lever on the side independent braking operation side, there is provided a turning device arrangement the traveling working machine so as to be interlocked operation.

[0006]

When the switching lever 9 is switched to the turning angle braking operation side in the state where the auxiliary transmission lever 8 is switched to the high speed side H, the operation causes the switching lever 9 to move the auxiliary transmission lever 8 to the low speed side. When the vehicle is operated so as to switch to L, the vehicle automatically switches to the turning angle braking operation state during low-speed running, so that low-speed work such as tilling work can be performed efficiently and safely.

When the switching lever 9 is positioned on the turning angle braking operation side and the sub transmission lever 8 is operated to drive at high speed on a road or the like, the operation of the sub transmission lever 8 is interlocked. Since the switching lever 9 is switched to the independent braking operation side, the turning at the time of high-speed running can be appropriately performed by the operator's artificial foot adjustment, so that safe high-speed running can be performed. In addition, by linking the above-described switching operations as described above, it is possible to work safely while preventing erroneous operations.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a body of a tractor shown as an embodiment of a traveling work machine, and right and left rear wheels having rear wheel brakes 3 connected to the left and right brake pedals 2 provided at the feet of a driver's seat 1a so as to be independently braked. 4 and a steering wheel 5 installed in the driver's seat 1a, supported by left and right front wheels 4a whose turning angles are operated to rotate. The front engine of the fuselage 1 is mounted and a working machine such as a tilling device is connected rearward. It has become.

The left and right brake pedals 2 are provided alongside a right support shaft 2a penetrating and protruding from the left and right sides of the body frame 1b. One brake pedal is rotatably supported by the support shaft 2a, and the other brake pedal is supported by the other. The brake pedal is pivotally supported to rotate integrally with the support shaft 2a.
The brake rods 3b are separately connected to each other via a brake rod 3b, and are elastically supported so as to be at the position indicated by the solid line in FIG. 1 when braking is not performed.

The handle 5 pushes and pulls a knuckle arm 7a by extending and retracting left and right hydraulic actuators 5b via a hydraulic steering unit 5a, and rotates a front axle 7 supporting a front wheel 4a to rotate the front wheel 4a. The vehicle is operated by operating at a desired cutting angle. The left and right brake pedals 2 are turned by a rotation of the front wheel 4a by a predetermined angle or more, and a conversion mechanism A described later is used.
A switching lever 9 for braking the turning angle of each of the left and right rear wheel brakes 3 via a turning traveling mechanism including an operating mechanism B, and linking this turning angle braking action to an auxiliary transmission operating member (auxiliary transmission lever 8). The switching mechanism C is configured to be capable of switching between an “operating state” and a “non-operating state”.

The conversion mechanism A includes a conversion arm 10 having an operation piece 10a which is swung by a front axle 7 and a rod 7b connected thereto, and a link arm 13 disposed on the left and right of the conversion arm 10. These members 10 and 13 are swingably supported on a support shaft 15 protruding from a side surface of a mounting plate 14 mounted on the body frame (transmission case) 1b. One end of the rod 11 is connected to each of the two link arms 13 via a spring 12, and the other end is an operating arm 20 that constitutes a left and right operating mechanism B.
It is connected to.

The link arm 13 restricts the swing range of each other by a stopper 16 provided on the mounting plate 14. The contact portion 13a screwed to the link arm 13 swings by the pushing and pulling operation of the rod 7b. Conversion arm 10 that moves
The left and right operating arms 20 of the operating mechanism B, which are provided so as to face each other on the operating piece 10a that moves together and are linked to the left and right rotation of the front wheel 4a, individually operate to swing the operating arm 20. Like that.

Further, by adjusting the bolt type contact portion 13a provided on the link arm 13, the conversion arm 10 is provided.
By adjusting the timing of contact with the operating piece 10a provided in the vehicle, the operating timing based on the turning angle of the front wheel 4a can be easily performed from outside the machine. On the other hand, the operating mechanism B pivotally supports the left and right operating arms 20 on a support shaft 22 protruding from a mounting plate 21 detachably mounted on the body frame 1b, and includes a rod 11 for transmitting the operation of the conversion mechanism A. The operating arm 20
The operation arm 20 is provided with a spring 23 urged in a direction opposite to the operation direction of the rod 11, and is brought into contact with a stopper 24 provided on the mounting plate 21 as shown by a solid line in FIG. The position limits its swing range.

One end of the switching member 25 is pivotally supported via a pivot pin 25b to the other piece that moves together with the left and right operating arms 20, and the base of the left and right brake pedals 2 has a "U-shape".
Member 2e in which a pin 2c is provided horizontally in a cylindrical holder 2b
(FIG. 2), and the switching member 2 is provided in the engagement member 2e.
5 is fitted so as to be able to slide up and down and to swing around the rotation pin 25b. In the center of one side surface of the switching member 25, the switching allowance H when engaging with the pin 2c is provided.
Is formed by notching in a concave shape. The lower end of the switching member 25 is connected to a rod 9c of an intermediate link 9b which is connected to the switching lever 9 via a rod 9a.

The length of the switching allowance H of the engaging portion 25a is, as shown by the solid line in FIGS. 1 and 3, the switching lever 9 is in the on state (the state shown by the solid line), and the left and right brake pedals 2
Are cut out by an amount of operation that does not hinder the swinging movement of the pin 2c provided on the engagement member 2e when the is operated alone. The step formed below the engaging portion 25a is positioned in a "brake standby state" in which the stepped portion engages with the pin 2c of the brake pedal 2 in the non-braking position.

The switching member 25 is connected to the switching lever 9.
Is operated downward through the rod 9a, the intermediate link 9b, and the rod 9c by being operated downward as shown by the chain line in FIG. 5, and is rotated forward like a chain line around the rotation pin 25b. The engagement of the brake pedal 2 with the pin 2c is released to bring the brake pedal 2 to the cut position. By releasing the engagement, the brake pedal 2 is released from the connection with the operating mechanism B by the rotation of the front wheel 4a, and the independent braking operation of only the brake pedal 2 is enabled.

The switching mechanism C is provided with an auxiliary transmission lever (not shown) provided in the transmission case of the body frame 1b above the switching lever 9 for switching between a high speed side H and a low speed side L. The auxiliary speed change lever 8 is provided with a return rod 8b having a long hole 8a formed therein for engaging with a projection 9e projecting from the switching lever 9. Therefore, when the sub-transmission lever 8 is operated from the low-speed side L position of the solid line shown in FIG. 5 to the high-speed side H of the chain line, the upper end of the long hole 8a comes into contact with the projection 9e and the switching lever 9 is moved. Switching member 25
Are linked so as to switch to the state of the chain line which is the cutting position.

When the switching lever 9 is in the cut position, the auxiliary speed change lever 8 is accommodated in the long hole 8a even if it is turned around the fulcrum 8c to the low speed side L. It can be operated as desired. When the auxiliary transmission lever 8 is on the low speed side L, the switching lever 9 can freely enter and leave the fulcrum 9f without operating the auxiliary transmission lever 8 due to the long hole 8a of the auxiliary transmission lever 8.

Therefore, in a state where the traveling work machine 1 is traveling at a high speed, even if the front wheel 4a is at a predetermined turning angle or more, the link with the brake is released. In addition, the vehicle body can be turned with a small radius (radio) as the turning angle braking operation turning only at the time of low-speed traveling by the auxiliary transmission. Therefore, the operator can perform a traveling operation in which the danger of being swung by a high-speed pivot turn can be avoided and the operation can be performed safely and efficiently.

Further, the converting mechanism A and the operating mechanism B having the above-mentioned construction are mounted on the body frame 1 under the step 1d laid on the foot of the driver's seat 1a in front of the seat 1c.
b, which is detachably installed in the side space, and is attached to each of the mounting plates 21, 14 on which the support shafts 22, 15 protrude.
(Fig. 2)
1, 7b, 9c and links (9b).

Therefore, the turning traveling mechanism can be easily and efficiently assembled to the body, and
This device can be compactly installed in the space below the step 1d with an extremely simple configuration, and this device can be provided with excellent handling characteristics. Next, traveling work of the traveling work machine 1 equipped with the device according to the present invention will be described. When the switching lever 9 is pushed to the "cut position" as shown by the chain line in FIG. 5, the switching member 25 is engaged with the engaging member 2e (FIG. 2) of the brake pedal 2 regardless of the position of the sub-transmission lever 8. The combination is released and released.

Therefore, when the front wheel 4a turns left or right, the operating piece 10 provided on the conversion arm 10 of the conversion mechanism A
a rotates to contact the contact portion 13 a of the link arm 13 to operate the left or right operation arm 20 via the rod 11 connected to the link arm 13. In this state, even if the knuckle arm 7a is steered and turned to the set turning angle, the brake pedal 2 is not operated, and the rear wheel brake 3 is not braked in conjunction with the turning angle. Only independent braking, in which the brake pedal 2 is operated in the same manner as the conventional brake pedal, is enabled by the stepping operation.

Therefore, at the time of work that does not require the turning angle braking operation, the independent braking operation can be easily performed simply by switching the switching lever 9 to the "cutting position". Can be performed safely. In the case of a work requiring a braking angle braking operation, such as a tilling operation, the switching lever 9 is moved upward to the “entrance position” so that the simple operation of the switching lever 9 alone without operating the auxiliary transmission lever 8 is performed. With a simple operation, the operation by the switching lever 9 during low-speed traveling can be performed safely and efficiently.

[0024]

The turning device for a traveling work machine according to the present invention enables a left and right rear wheel brakes 3 to be independently brake-operated on a traveling body having a subtransmission mechanism for performing low-speed traveling and high-speed traveling, and a steering wheel. When the turning angle of the front wheel 4a is greater than or equal to a predetermined value, the independent braking operation state and the turning angle braking are performed. A switching lever 9 for selectively switching to an operation state and an auxiliary transmission lever 8 for switching a traveling speed between a high-speed side H and a low-speed side L are provided close to the body 1; 9 is operated to the turning angle braking operation side when the auxiliary transmission lever 8 is operated.
Is switched from the high-speed side H to the low-speed side L, and when the shift lever 9 is operated from the low-speed side L to the high-speed side H, the switching lever 9 on the turning angle braking operation side is switched to the independent braking operation side. And it is comprised so that it may operate interlockingly.

Therefore, even if the operator operates the switching lever 9 toward the turning angle braking operation side without the operator noticing that the auxiliary transmission lever 8 is being switched to the high speed side H, the switching lever 9 is not required. , The auxiliary transmission lever 8 can be switched to the low speed side L without fail. The operation of the auxiliary transmission lever 8 to the high-speed side H is performed by the switching lever 9.
Is possible only in the "off" state, i.e., at the time of independent braking operation, so that danger due to high-speed sudden turning of the aircraft 1 can be prevented, reliable operation without erroneous operation can be easily performed, and operation efficiency is improved. It can be done safely.

[Brief description of the drawings]

FIG. 1 is a connection diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the configuration of the embodiment of the present invention.

FIG. 3 is a side view showing a main part of the embodiment of the present invention.

FIG. 4 is an operation diagram of the device of FIG. 3;

FIG. 5 is a side view showing a switching lever and a subtransmission lever.

[Explanation of symbols]

Reference Signs List 1 body 1b body frame 2 brake pedal 2b holder 2c pin 2e engaging member 3 rear wheel brake 4 rear wheel 4a front wheel 7a
Knuckle arm 8 Sub-shift lever 9 Switching lever 10 Conversion arm 13 Link arm 14, 21 Mounting plate 15,
22 Support shaft 20 Operation arm 25 Switching member A Conversion mechanism B Operation mechanism C Switching mechanism

Claims (3)

(57) [Claims] 1. A traveling machine equipped with an auxiliary transmission mechanism that performs low-speed traveling and high-speed traveling, enables left and right rear wheel brakes 3 to be independently braked, and a steering angle of a front wheel 4a by operating a steering wheel is greater than or equal to a predetermined value. And a switching lever 9 for selectively switching between the independent braking operation state and the braking angle operation state in a traveling work machine capable of performing a braking angle operation so as to operate the rear wheel brake 3 on the body turning side when the vehicle is turned. And a sub-shift lever 8 for switching the traveling speed between a high speed side H and a low speed side L is provided in the vicinity of the body 1, and the two levers 8, 9 are used when the switching lever 9 is operated to the turning angle braking operation side. When the sub-shift lever 8 is switched from the high-speed side H to the low-speed side L, and the shift lever 9 is operated from the low-speed side L to the high-speed side H, the switching lever 9 on the turning angle braking operation side is shifted to the independent braking operation side. I will switch Tandem, the traveling working machine turning apparatus characterized by interlocking operation. 2. A brake 3 on one side inward of the rear wheel 4 corresponding to the cutting direction of the front wheel 4a is
The turning device for a traveling work machine according to claim 1, wherein the turning device is configured to perform the operation in conjunction with the movement of the knuckle arm 7a. 3. The system is configured so that the movement of a front axle 7 operated by a handle 5 is operated via a conversion mechanism A and an operation mechanism B to operate an operation member 3a of the rear wheel brake 3.
The turning device for a traveling work machine according to claim 1, wherein the sub-shift lever (8) and the switching lever (9) are configured to be interlockable, and the switching lever (9) and the operating mechanism (B) are configured to be able to cooperate.