JP3054313B2 - Turning operation mechanism 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 for a traveling working machine having a sub-transmission mechanism such as a tractor and a turning traveling mechanism by independent braking operation and 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. 2. Description of the Related Art There is known a traveling work machine of a type in which left and right rear wheel brakes on a turning side are operated in response to a turning angle to perform a turning angle braking operation.

The traveling work machine is provided with a switching mechanism capable of selectively switching between an independent braking operation state and a turning angle braking operation state. The switching mechanism is switched so as to perform the simultaneous braking or the independent braking operation state, and the traveling operation with high safety is performed, and in the case of the low-speed operation such as the tilling operation in the field, the switching operation is switched to the turning angle braking operation state. This facilitates turning.

The switching mechanism is performed by mechanical means using a link structure. A link member for detecting a turning angle provided on a steering wheel or a front wheel is detachably attached to the steering wheel or the front wheel. At times, it is attached to the turning angle braking operation work state, and when it is detached, it is replaced so as to be in the independent braking operation state.

[0005]

However, in the conventional switching mechanism, it is necessary to perform the traveling turning operation by switching between the two modes by attaching and detaching the link member. In addition to the inefficiency, there is a problem that there is a danger that a trouble is likely to occur due to an improper assembly at the time of switching.

[0006]

In order to solve the problem of the conventional device, a turning operation mechanism of a traveling work machine according to the present invention comprises a left and right rear wheel brakes 3 and left and right brake pedals 2.
Independent running operation of the front wheel 4a by operating the steering wheel, and a running operation including a turning angle braking mechanism that activates the rear wheel brake 3 on the turning side of the fuselage when the turning angle of the front wheel 4a exceeds a predetermined value. In the machine, an operating mechanism B which is provided separately to the left and right brake pedals 2 and which engages with the left and right brake pedals 2 in a releasable manner, and connecting members (rods) 7b, 11 for connecting the operating mechanism B and the front wheel 4a. A conversion mechanism A for transmitting a turning angle of the front wheel 4a equal to or greater than a predetermined value to the operating mechanism B
The switching member 25 of the operating mechanism B that engages with the engaging member 2e formed on the brake pedal 2 is switched.
By connecting to the bar 9 and engaging and disengaging, a switching operation is performed between the independent braking operation area and the turning angle braking operation area ,
In addition, the traveling speed is switched to a plurality of speed stages of high speed traveling H and low speed traveling L.
The sub-shift lever 8 and the switching lever 9 to be changed are connected to the sub-shift
When the lever 8 is in the high-speed running H state, the switching lever 9
The switching lever 9 is in the "OFF" state and the switching lever 9 is in the "OFF" state.
In this case, the sub-shift lever 8 is switched between high speed running H and low speed running L.
It is in a state where it can be selected.

[0007]

In FIG. 5, by operating the switching lever 9 from the braking angle braking operation position shown by the solid line to the downward direction shown by the chain line, the switching member 25 engaged with the engaging member 2e of the brake pedal 2 is disengaged. It is possible to easily switch to the independent braking operation state and perform an operation so as to promptly shift from the traveling operation by the turning angle braking operation to the traveling operation by the independent braking operation.

When switching from the independent braking operation state to the turning angle braking operation state, the switching member 9 is engaged with the engaging member 2e by operating the switching lever 9 to a position indicated by an upper solid line. This can be easily performed. Then, the traveling work machine 1 travels at high speed.
The front wheel 4a is at or above a predetermined turning angle.
Even if the brake is released,
With the auxiliary transmission without turning
Aircraft as turning angle braking operation turning only at low speed running
Can be made to turn at a small radius. Therefore,
Danger of operators being swung by high-speed ground turns
Driving that can operate safely and efficiently by avoiding traffic
Can work.

[0009]

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, the steering angle is supported by left and right front wheels 4a which are turned. The engine is mounted on the front part of the body 1 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 projecting right and left of the body frame 1b, and one brake pedal 2 is rotatably supported by the support shaft 2a. The other brake pedal 2 is pivotally supported so as to rotate integrally with the support shaft 2a, and is separately connected to an operating member 3a of the rear wheel brake 3 via a brake rod 3b. It is elastically supported.

The handle 5 pushes and pulls the knuckle arm 7a by extending and retracting the left and right hydraulic actuators 5b via the hydraulic steering unit 5a, and rotates the front axle 7 supporting the front wheel 4a to move 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 operating 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 is restricted in its swinging range by a stopper 16 provided on the mounting plate 14, and 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 a 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
A spring 23 urged in a direction opposite to the operation direction of the rod 11 is stretched on the operation arm 20 and brought into contact with a stopper 24 provided on the mounting plate 21 to be 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 which 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 vertically slidable and swingably fitted around the pivot pin 25b. At the center of one side surface of the switching member 25, an engagement portion 25a, which is a switching allowance H for engaging with the pin 2c, is formed by being concavely cut.
A rod 9c of an intermediate link 9b for connecting the lower end of the switching member 25 to the switching lever 9 via a rod 9a.
It is connected to.

As shown by the solid line in FIGS. 1 and 3, the length of the switching margin H of the engaging portion 25a is in the state where the switching lever 9 is in the engaged state (the state shown by the solid line).
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 has a sub-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 elongated hole 8a even if it is turned to the low speed side L about the fulcrum 8c. 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, when the traveling work machine 1 is traveling at a high speed, the link with the brake is released even if the front wheel 4a has a predetermined turning angle or more. In addition, the vehicle body can be turned with a small radius (radical) 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 conversion mechanism A and the operating mechanism B having the above-described structure 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, when the operation that does not require the turning angle braking operation is performed, the independent braking operation can be easily performed simply by switching the switching lever 9 to the "cutting position". It can be done 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.

As described above, the switching between the independent braking operation and the turning angle braking operation during the traveling work can be easily performed by simply operating the switching lever 9 in the vertical direction while the operator is in the driver's seat 1a. Therefore, erroneous operation can be prevented, and highly safe traveling work can be performed. Further, since the conversion mechanism A and the operation mechanism B, which constitute the turning angle braking mechanism, are integrally assembled in an assembly shape, the conversion mechanism A and the operation mechanism B can be easily assembled below the step 1d on the side surface of the body frame 1b. The mechanism B uses a brake pedal mechanism having substantially the same shape and size regardless of the size of the body, and switches the switching member 25 that is operated in conjunction with the front wheel 4a to the brake pedal so as to be disengageable by the switching lever 9. With a simple configuration, it is possible to share parts in other models.

The turning operation mechanism of the traveling work machine according to the present invention enables the left and right rear wheel brakes 3 to be independently braked by the left and right brake pedals 2, and the turning angle of the front wheel 4a by operating the steering wheel is greater than a predetermined angle. In a traveling work machine provided with a turning angle braking mechanism for actuating the rear wheel brake 3 on the body turning side when the vehicle is turned, the turning angle braking mechanism is separately provided to the left and right brake pedals 2 and is releasably engaged. An operating mechanism B, and a conversion mechanism A for transmitting, to the operating mechanism B, an angle of rotation of the front wheel 4a equal to or greater than a predetermined angle in connecting members 11 and 7b for connecting the operating mechanism B and the front wheel 4a; by the actuation mechanism B switching member 25 to be engaged with the engaging member 2e formed on the brake pedal 2 is ligated to the switching lever 9 disengagement operation, the independent braking operation zone and steering angle braking operation zone Performs a switching operation, and further, high speed
A sub-transformation that switches the traveling speed to multiple stages of traveling H and low-speed traveling L
The speed lever 8 and the switching lever 9 are
In the state of high-speed running H, the switching lever 9 is in the “OFF” state
When the switching lever 9 is in the "OFF" state,
A state in which the speed change lever 8 can be selected between a high speed running H and a low speed running L
And the following effects can be obtained.

That is, the turning operation mechanism for switching the rear wheel brake of the traveling body independently of the braking operation and the turning angle control device is constituted by a conversion mechanism, an operating mechanism, and a switching lever mechanism so as to be divided into individual parts. Since the device is connected to a possible brake pedal, it is possible to assemble the device into an assembly for each block, and to provide a device with a simple configuration.

Further, since the turning operation mechanism is mounted by utilizing the side surface of the body, the mounting operation and the maintenance operation can be performed efficiently and easily. Furthermore, by providing an operating mechanism for the independent brake mechanism of the brake pedal in the traveling work machine and connecting the operating mechanism to the switching lever to enable switching operation, it is possible to securely perform operation safely with a simple configuration. it can. And
When the traveling work machine 1 is traveling at a high speed, the front wheels
Even if 4a is more than the predetermined angle of cut, the interlock with the brake
Since it is released, make a turn linked with the brake
Only when running at low speed with the auxiliary transmission.
When the aircraft is turned with a small radius
Can be made. Therefore, the operator needs a high speed
Safe and efficient operation by avoiding the risk of swinging
Can do the traveling work can do the work
You.

[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 2 brake pedal 3 rear wheel brake 4 rear wheel 4a front wheel 7a knuckle arm 8 auxiliary transmission lever 9 switching lever 1a driver's seat 1b body frame 10 conversion arm 13 link arm 14,21 mounting plate 15,22 support shaft 20 operating arm 25 Switching member A Conversion mechanism B Operation mechanism

Claims (2)

(57) [Claims] 1. The left and right rear wheel brakes 3 can be independently braked by the left and right brake pedals 2, and the rear wheel brakes on the turning side of the vehicle body when the turning angle of the front wheels 4a by the steering wheel operation becomes a predetermined angle or more. Cutting angle to activate 3
In a traveling work machine provided with a braking mechanism, an operating mechanism B which is provided separately to the left and right brake pedals 2 and which engages with the left and right brake pedals 2, and which connects the operating mechanism B and the front wheel 4a. A conversion mechanism A for transmitting a turning angle of the front wheel 4a equal to or greater than a predetermined value to the operating mechanism B in the members 11 and 7b, and an operating mechanism B engaged with an engaging member 2e formed on the brake pedal 2 by the switching member 25 by connecting engaging and disengaging operation switching lever 9, no line operation switched and independent braking operation zone and steering angle braking operation range, further, running in a plurality of stages of high speed travel H and low speed L Switch off the gear
The sub-shift lever 8 and the switching lever 9 to be changed are connected to the sub-shift
When the lever 8 is in the high-speed running H state, the switching lever 9
The switching lever 9 is in the "OFF" state and the switching lever 9 is in the "OFF" state.
In this case, the sub-shift lever 8 is switched between high speed running H and low speed running L.
The turning operation mechanism of the traveling work machine that can be selected . 2. The left and right rear wheel brakes 3 are connected to left and right brakes.
The pedal 2 enables independent braking operation, and
The turning angle of the front wheel 4a due to the dollar operation has exceeded a predetermined value.
Angle to activate the rear wheel brake 3 on the aircraft turning side
In a traveling work machine equipped with a braking mechanism, the turning angle braking mechanism is separately provided to the left and right brake pedals 2.
An operating mechanism B provided and removably engaged, and the operating mechanism
B and front wheels 4a are connected to each other by connecting members 11 and 7b.
The turning angle of the wheel 4a which is equal to or greater than a predetermined value is transmitted to the operating mechanism B.
The brake pedal 2
Switching member of the operating mechanism B engaged with the formed engaging member 2e
25 is connected to the switching lever 9 to be engaged and disengaged.
Switching between independent braking operation area and turning angle braking operation area
Operation, and furthermore, the movement of the front axle 7 operated by the handle 5
The rear wheel brake via the conversion mechanism A and the operation mechanism B
3 actuating member 3a is operated, and
When the bar 8 and the switching lever 9 are configured to be interlockable
Both actuating mechanism B and is of configuration can work with switching levers 9
The turning operation mechanism for a traveling work machine according to claim 1, wherein