JPH08156626A - Turning device of traveling work machine - Google Patents

Abstract

PURPOSE: To facilitate speedy small turning travel by increasing speed in an anti-turning side front wheel by switching a switching mechanism by engaging and actuating a switching member when an actuating member of a link system is actuated in the braking direction by operation of a steering wheel. CONSTITUTION: A turning directional side rear wheel brake 3 is braked when an actuating member 20 is actuated through a link system of a turning travel mechanism by rotational operation not less than a prescribed value of a steering wheel 5. When a switching member 31 becomes movable by being put in an engaging condition from a separated condition according to actuation of this actuating member 20, a switching mechanism 36 is switched, and an anti-turning side front wheel 4a is rotated at increased speed. Speedy small turning travel can be performed together with turning by steering angle braking operation, and plowing work or the like can be efficiently performed with high accuracy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention operates a rear wheel brake on the turning side of an airframe when the turning angle of the front wheel by a steering wheel operation exceeds a predetermined value, and automatically turns the front wheel on the non-turning side. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning device for a traveling work machine that performs turning traveling by increasing the speed of the vehicle.

[0002]

2. Description of the Related Art Conventionally, when traveling while cultivating an agricultural tractor, the left and right rear wheel brakes are independently braked in the turning direction of the machine to make a solid turn, and the steering wheel is turned to a sharp corner. By the sensing operation above the predetermined value of the sensor installed in the tie rod of the front wheel that interlocks with,
The rear wheel brake on the turning side is braked to perform turning traveling by the turning angle braking operation, and a detection device for detecting turning traveling in the turning angle braking operation state is provided, and the front wheel on the anti-turning side is accelerated by the command. Front wheel speed increasing mechanism to rotate,
By switching operation by a switching mechanism composed of an electric system or a hydraulic system, the front wheel on the side opposite to the turning side, which is outside the turning radius, is accelerated during the turning angle braking operation state to perform a small turn traveling.

[0003]

However, in the above-mentioned conventional apparatus, the turning traveling mechanism for performing the turning angle braking operation and the front wheel speed increasing mechanism for speeding up the anti-turn side front wheel are both expensive and electric. Since it is configured independently by the hydraulic system,
It has a drawback that its structure becomes complicated and the cost becomes high.
In addition, it is difficult to share each component, and for example, it is not possible to easily install a front wheel speed-increasing mechanism by retrofitting on a traveling work machine that has only a broken turning traveling mechanism, which makes it difficult to do so. There is.

[0004]

SUMMARY OF THE INVENTION In the turning device for a traveling work machine of the present invention for solving the above-mentioned conventional problems, the turning break angle of the front wheel 4a by the steering wheel operation of the left and right rear wheel brakes 3 is not less than a predetermined value. And a turning traveling mechanism capable of being selectively switched to a turning angle braking operation state so as to operate the rear wheel brake 3 on the vehicle body turning side from the independent braking operation state,
In a traveling work machine equipped with a front wheel speed increasing mechanism D capable of switching between low-speed rotation and speed-up rotation in a transmission mechanism to the front wheels 4a so as to perform turning traveling, the turning traveling mechanism is operated by operating the brake petal 2. A link system for braking the rear wheel brake 3 on the turning side is configured, and an operating member 20 in the link system and a switching member 31 of a switching mechanism 36 for switching the front wheel speed increasing mechanism D to the speed increasing side are detachably provided. Thus, when the operating member of the link system is operated in the braking direction by operating the handle 5 in the turning angle braking operation state, the switching member 31
Is engaged to operate the switching mechanism 36 to increase the speed of the front wheel 4a on the non-turning side, so that the turning traveling is performed.

[0005]

[Operation] With the above-described configuration, when the turning angle braking operation is performed in the cultivating work or the like, the rear wheel brake 3 on the turning direction side is actuated through the link system of the turning traveling mechanism by the turning operation of the handle 5 more than a predetermined amount. 20 is activated and braked.
With the operation of the operating member 20, the switching member 31 moves from the disengaged state to the engaged state, whereby the switching mechanism 3 is moved.
6 by switching the front wheel speed increasing mechanism D to the front wheel 4a on the side opposite to the turning side.
To increase the speed of rotation and to perform a quick small turn travel.

[0006]

EXAMPLES Examples of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a vehicle body of a tractor shown as an example of a traveling work machine, and left and right rear wheels having rear wheel brakes 3 that are linked to each other by independent left and right brake pedals 2 provided at the foot of a driver's seat 1a. 4 and left and right front wheels 4a whose turning angle is turned by a steering wheel 5 installed in the driver's seat 1a, an engine is mounted in the front part of the machine body 1, and a working machine such as a tiller is connected to the rear side. It is like this.

The left and right brake pedals 2 are juxtaposed to a right side support shaft 2a penetrating the left and right sides of the body frame 1b, and one brake pedal is rotatably supported by the support shaft 2a and the other. The brake pedal is pivotally supported so as to rotate integrally with the support shaft 2a, and is separately connected to the operating member 3a of the rear wheel brake 3 through the brake rod 3b. It is elastically supported by the maintaining spring (not shown) biased to the state so as to be in the position shown by the solid line in FIG.

The handle 5 is provided with a hydraulic steering unit 5a and left and right hydraulic actuators 5b (FIG. 1).
The knuckle arm 7a is pushed and pulled by expanding and contracting, and the front axle 7 supporting the front wheel 4a is rotated to operate the front wheel 4a at a desired turning angle and to travel. And the left and right brake pedals 2
The left and right rear wheel brakes 3 are individually braked by turning angle of the front wheels 4a over a predetermined turning angle through a turning traveling mechanism including a conversion mechanism [A] and an operating mechanism [B], which will be described later. A switching mechanism [C] including a switching lever 9 in which the angular braking action is linked to the sub-transmission operating member (sub-transmission lever 8) is configured to be selectively switchable between the "acting state" and the "non-acting state". are doing.

The conversion mechanism [A] includes a conversion arm 10 with an actuating piece 10a that is swung by a front axle 7 and a rod 7b connected to the front axle 7, and the conversion arm 1.
0 and the link arms 13 arranged on the left and right, and these members 10 and 13 are the body frame (transmission case) 1b.
It is swingably supported by a support shaft 15 projecting from the side surface of a mounting plate 14 mounted on. And the two link arms 1
3, one end of the rod 11 is connected to each other via a spring 12, and the other end is a left and right actuating mechanism B.
It is connected to 0.

Then, the link arms 13 restrict the swinging range of each other by a stopper 16 (FIG. 2) provided on the mounting plate 14, and a contact portion 13a screwed to the link arm 13 pushes and pulls the rod 7b. The left and right actuating arms 20 of the actuating mechanism B, which are provided so as to oppose each other on the actuating pieces 10a that move together with the converting arm 10 that swings and rotate, are linked to the left and right turning of the front wheel 4a, are individually pulled. However, the operating arm 20 is swung.

Further, the conversion arm 10 is adjusted by adjusting a bolt type contact portion 13a provided on the link arm 13.
By adjusting the timing of contact with the operating piece 10a provided on the vehicle, the operating timing depending 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] supports the left and right operating arms 20 on a supporting shaft 22 projecting from a mounting plate 21 which is attachable to and detachable from the machine body frame 1b so as to be swingable.
A rod 11 for transmitting the operation of the conversion mechanism [A] is connected to the operating arm 20, and the rod 11 is connected to the operating arm 20.
A spring 23 biased in a direction opposite to the operating direction is stretched and abutted against a stopper 24 provided on the mounting plate 21 to regulate the swing range to the position shown by the solid line in FIG.

Further, one end of the switching member 25 is pivotally supported by another piece which moves together with the left and right actuating arms 20 through a turning pin 25b, and the base portions of the left and right brake pedals 2 have a "U" shape.
Member 2e in which a pin 2c is provided horizontally in a holder 2b
(FIG. 2) is provided, and the switching member 2 is provided in the engaging member 2e.
5 is vertically slidable and is swingably fitted around the rotation pin 25b.

At the center of one side surface of the switching member 25, an engaging portion 25a serving as a switching accommodation margin H when engaging with the pin 2c is formed by notching in a concave shape. Further, the lower end of the switching member 25 is connected to the switching lever 9 by the rod 9a.
The rod 9c of the intermediate link 9b connected via (FIG. 3)
Connected to. As shown by the solid line in FIGS. 1 and 3, the length of the switching allowance H of the engaging portion 25a is such that the switching lever 9 is in the engaged state (the state shown by the solid line) and the left and right brake pedals 2 are independently operated. Pin 2 provided on the engaging member 2e when operating
Notched by an amount that does not hinder the swinging motion of c. The stepped portion formed below the engaging portion 25a is positioned in the "brake standby state" in which the stepped portion is engaged with the pin 2c of the brake pedal 2 in the non-braking posture.

The switching member 25 is provided with a switching lever 9
Is operated downward as shown by the chain line in FIG. 5, it is pushed through the rod 9a, the intermediate link 9b, and the rod 9c, and is rotated forward about the rotation pin 25b as shown by the chain line. The engagement with the pin 2c of the brake pedal 2 is released to the cut position. By this disengagement, the brake pedal 2 is released from the connection with the operating mechanism [B] by the rotation of the front wheels 4a, and the independent braking operation of only the brake pedal 2 is enabled.

Further, in the switching mechanism [C], an auxiliary transmission mechanism (not shown) formed in the transmission case of the body frame 1b above the switching lever 9 is operated to switch between a high speed side H and a low speed side L. A shift lever 8 is provided (FIG. 3), and the sub shift lever 8 is provided with a return rod 8b having a long hole 8a engaged with a projection 9e projecting from the switching lever 9. Therefore, when the auxiliary 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 elongated hole 8a abuts the projection 9e and the switching lever 9 is moved. The switching member 25 is interlocked so as to switch to the state of the chain line that is the cut position.

Further, when the switching lever 9 is in the cut position, the auxiliary transmission lever 8 is accommodated in the elongated hole 8a even if it is rotated around the fulcrum 8c toward the low speed side L. It is possible to operate it as desired while keeping it. When the auxiliary shift lever 8 is on the low speed side L, the switching lever 9 can freely perform the turning operation around the fulcrum 9f without operating the auxiliary shift lever 8 due to the elongated hole 8a of the auxiliary shift lever 8.

Further, the conversion mechanism [A] and the actuation mechanism [B] configured as described above are installed in the side surface space portion of the machine body frame 1b at the lower part of the step 1d laid on the foot portion in front of the seat 1c of the driver's seat 1a. Each of the mounting plates 21 and 14 is detachably installed, and the mounting shafts 21 and 15 project from the mounting shafts 21 and 14.
Is detachably attached with the bolt 1e (Fig. 2),
The rods 11, 7b, 9c and links (9b) are connected to each other.

In the turning traveling mechanism composed of a series of link systems as described above, a front wheel speed increasing mechanism [D] for speeding up rotation of the front wheel 4a on the non-turning side in the turning angle braking operation state has the following structure. It is installed by. As shown in FIG. 7, the front wheel speed increasing mechanism [D] has a well-known configuration and has a body frame 1b.
The left and right front wheels 4a are configured to enable normal running at low speed rotation and increased speed running at high speed by switching the internal transmission gears and the like by means of a transmission mechanism. By the operation of the operation arm (operation member) 20 provided therein, the switching member 31 of the switching mechanism 36 is engaged and operated.

That is, in the turning angle braking operation state, the operating arm (operating member) 20 loosely fitted to the support shaft 30 via the front axle 7 and the rod 11 is rotated by a predetermined amount by the rotating operation of the handle 5. , Sensor arm (switching member)
31 is engaged and rotated in the same direction. This allows
The switching piece 32 fixed to the other end of the support shaft 30 fitted into the machine body frame 1b pulls the switching piece 35 in the same direction via the adjusting spring 34 inserted into the rod 33, and this switching piece 35
Is pressed against a push rod 36a of a switching mechanism 36 composed of a hydraulic switching valve or the like to switch a speed change gear installed in the front wheel speed increasing mechanism [D] via a hydraulic line 37, so that the left and right front wheels 4a are not turned. The front wheel 4a on the side is configured to be rotated at an increased speed alternatively from the normal traveling rotation state.

Further, the front wheel 4a that is rotated at the increased speed as described above uses the actuating arm 20 of the actuating mechanism [B] as an actuating member, so that the brake petal 2 has a timing before completing the braking operation. Anti-turn side front wheel 4a
Can be accelerated, and there is an advantage that a smooth small turn can be satisfactorily performed without abruptly. In the case of turning at the normal traveling speed without increasing the front wheels during the turning angle braking operation, the wire 41 of the switching clutch 40 shown in FIG. 8 is simply pulled by operating from the driver seat 1a side. be able to.

That is, the switching clutch 40 is the switching member 3
A shaft portion 31a formed at the base end portion of 1 is slidably engaged in the support shaft 30, and an engagement piece 3 is bent at the other end portion.
1b is crossed so as to traverse the operating direction of the left and right actuating members 20, 20, and the wire 41 is attached to the tension spring 42.
The switching member 31 is slid in the axial direction so as to break the engagement between the engagement piece 31b and the operating member 20, 20.

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 auxiliary transmission lever 8. It becomes a state that it is released by leaving the case. Therefore, when the front wheel 4a turns to the left or right, the operating piece 10a provided on the conversion arm 10 of the conversion mechanism [A] is rotated to contact the contact portion 1 of the link arm 13.
The left or right actuating arm 20 is actuated via the rod 11 that is in contact with 3a and is connected to this link arm 13.

In this state, the brake pedal 2 is not operated even if the knuckle arm 7a is steered and rotated to the set turning angle, and the rear wheel brake 3 is not braked in conjunction with the turning angle. By pedaling the pedal 2, only independent braking is possible by operating the brake pedal 2 as in the conventional one. And plowing work,
In the case of work that requires a break angle braking operation, the switching lever 9
By moving the switch to the "entering position", the work by the switching lever 9 at low speed running can be performed by a simple operation of only the switching lever 9 without operating the auxiliary transmission lever 8.

At this time, when the handle 5 is rotated more than a predetermined amount, the rear wheel brake 3 on the turning direction side is braked by operating the operating member 20 via the link system of the turning traveling mechanism. When the switching member 31 moves from the disengaged state to the engaged state in accordance with the operation of the operating member 20, the switching mechanism 36 is switched to rotate the front wheel 4a on the anti-turning side at an increased speed, and the turning operation is performed by the turning angle braking operation. It is possible to perform small turning swiftly due to dust and to perform plowing work with high accuracy and efficiency.

[0025]

According to the present invention configured as described above, the following effects can be obtained. By operating the link system of the turning traveling mechanism based on the turning of the front wheels by the operation of the steering wheel and the operation of the switching member provided in this link system, the rear wheel brake on the turning side is braked in the turning angle braking operation state, and the front wheel is increased. Since the switching mechanism of the speed mechanism is operated to be switched, the front wheel on the side opposite to the turning side can be accurately increased in speed, and the small turn traveling in the turning angle braking operation state can be promptly performed.

Further, since the switching member of the front wheel speed increasing mechanism is engaged with and disengaged from the actuating member in the link system of the turning mechanism, the structure is not complicated.
It is possible to provide a swing device for a traveling work machine that is simple, easy to assemble, and inexpensive.

[Brief description of drawings]

FIG. 1 is a connection diagram showing a configuration of an exemplary 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.

4 is an operational view of the device of FIG.

FIG. 5 is a side view showing a switching lever and an auxiliary shift lever.

FIG. 6 is a side view showing a configuration in which the turning traveling mechanism and the switching member are connected to each other in the embodiment of the front wheel speed increasing mechanism.

FIG. 7 is a rear view of FIG. 6;

FIG. 8 is a cross-sectional view of a main part showing a mounting structure of a switching member.

[Explanation of symbols]

1 Airframe 1b Airframe 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 spindle 20 operating arm (operating member) 25 switching member
30 support shaft 31 sensor arm (switching member) 32, 35 switching piece 36 switching mechanism A converting mechanism B operating mechanism C switching mechanism D
Front wheel speed-up mechanism

Claims (1)

[Claims] 1. When the left and right rear wheel brakes 3 have a turning cut angle of the front wheels 4a by a steering wheel operation of a predetermined value or more, the rear wheel brakes 3 are operated so as to operate the rear wheel brakes 3 from the independent braking operation state. A turning traveling mechanism that can be selectively switched to the angular braking operation state and a front wheel speed increasing mechanism D that can switch between low speed rotation and speed increasing rotation in the transmission mechanism to the front wheels 4a are provided to perform turning traveling. In the traveling work machine, the turning traveling mechanism is configured as a link system that operates the brake petal 2 to brake the turning-side rear wheel brake 3, and the operating member 20 and the front wheel speed increasing mechanism D in the link system are accelerated. By providing the switching member 31 of the switching mechanism 36 for switching to the side so as to be disengageable, when the operating member of the link system is operated in the braking direction by the operation of the handle 5 in the turning angle braking operation state, the switching unit By the 31 accelerated the front wheels 4a of switching the switching mechanism 36 is engaged in operation counter turning side, the traveling working machine turning apparatus characterized by performing the turning.