JPS6048371B2 - Braking structure for driving work vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a braking structure for running a work vehicle, in which a steering brake is attached to each of a pair of left and right drive wheels.

In the above-mentioned work vehicles, the steering brake has traditionally been used as a parking brake, but the steering brake is often
Moreover, since the wheels are used with driving force applied to them, they are susceptible to wear and tear, and as a result, there is a high risk that the vehicle will move unexpectedly, for example, when parking on a slope.

An object of the present invention is to enable a vehicle to be parked in a safe state that reliably prevents unexpected movement of the vehicle body, even though it is a simple improvement.

Next, embodiments of the present invention will be described based on illustrative drawings.

A pair of left and right tire wheels 1a, 1b, 2a at the front and rear, respectively.
An engine 3 and a control unit 4 are arranged in parallel in the front and back on a body with a shaft mounted on the body, and the output of the engine 3 is configured to be transmitted to both rear wheels 2a and 2b. A tractor is constructed in which a working device can be connected to the wrist arm 5 so as to be able to be raised and lowered.

To configure the transmission system for the rear wheels 2a and 2b, a second
As shown in the figure, a drive shaft 6 connected to the engine 3 is connected to the engine 3.
A pair of left and right output shafts 1 of the differential gear 8 are interlocked and connected to an input shaft 9 of a differential gear 8 installed inside the rear transmission case 7.
0a and 10b are gear-coupled with an axle 11a for the left rear wheel 2a and an axle 11b for the right rear wheel 2b, respectively.

J A spring 12 is attached to each of the axles 11a and llb.
Each type of friction brake 13a or 13b for steering is biased into a non-braking state by a spring 14, and each version type friction brake 15a or 15b for parking is biased into a non-braking state by a spring 14. By selectively braking the left and right rear wheels 2a, 2b using both steering brakes 13a, 13b, the turning radius can be made smaller than that achieved by steering only the front wheels 1a, lb.
Even if the steering brakes 13a and 13b are significantly worn out, consideration has been given to ensuring that both wheels can be braked reliably during parking. Moreover, according to the above-mentioned parking brake arrangement configuration, even if both wheels 2a and 2b are subjected to mutually reverse rotation action, as in the case where the parking brake is provided on the upper side of the transmission than the differential device 8,
Due to the characteristics of the differential device 8, the vehicle body does not move.

The steering brakes 13a, 13b are operated by a pair of left and right hood type pedals 16a, 16b swingably disposed on the steering section 4, and by the parking brakes 15.
The operations of a and 15b are performed by one parking lever 17, which is disposed on the control section 4 so that it can swing and be fixed, and the linkage mechanism between these operating tools and each brake is as follows. It is constructed as shown in FIG.

That is, the relay shaft 19 is rotatably held by the cylindrical body 18 fixed to a single part, and the parking lever 17 is attached to the relay shaft 19.
The parking lever 17 is fixed by fixing the boss of the parking lever 17 via pin a.
The relay shaft 19 rotates as the parking lever 17 swings, and the operation arms 20a, 20b of the left and right parking brakes 15a, 15b, respectively, are rotated, and both brake arms 20a, 20b are operated.
are connected to each other so as to swing.

By operating a push button 2.4 attached to a grip portion of the parking lever 17, a swingable locking pawl 25 attached to the parking lever 17 is engaged and disengaged from a fixing member 26. A lever locking mechanism is provided which switches the parking lever 17 between an active state and a non-active state for locking the parking lever 17 in an arbitrary swing position. A pair of left and right relay cylinder shafts 21a and 21b are fitted onto the relay shaft 19 so as to be relatively rotatable, and the left relay cylinder shaft 21a and the left pedal 16a are fitted into the cylinder body 18 so as to protrude to both the left and right sides. and left steering brake 1
The operation arm 22a of the right relay cylinder shaft 21b, the right pedal 16b, and the right steering brake 13b are connected to each other so that the relay cylinder shaft 21a rotates as the pedal 3 swings, and the arm 22a swings. The operation arm 22b is interlocked and connected so that the relay cylinder shaft 21b rotates as the pedal swings, and the arm 22b swings.

Between the relay shaft 19 and each of the relay cylinder shafts 21a, 21b, there is provided a shaft to rotate each of the relay cylinder shafts 21a, 21b in the steering brake braking direction as the relay shaft 19 rotates in the parking brake braking direction. In the case of the engagement mechanism 23 (which operates), that is, the right-hand operation system, the projection 17a protruding in the axial direction from the end surface of the boss portion of the parking lever 17 and the right peggle 16
The projection 21b' protrudes in the axial direction from the end surface of the relay cylinder shaft 21b of b, and in the case of the left operation system, the relay shaft 19.
The projection 19a provided on the left pedal 16a and the relay cylinder shaft 21a of the left pedal 16a
A protrusion 21a' is provided that projects from the end surface in the axial direction, and the parking brakes 15a, 15b are operated by the parking lever 17.
During the braking operation, both steering brakes 13a and 13b are also operated.

In other words, by making a simple improvement such as installing the parking brakes 15a and 15b on the lower side of the differential gear 8 and separately from the steering brakes 13a and 13b, it is possible to reliably brake the wheels during parking and prevent unexpected Accidents caused by running vehicles can now be prevented.

[Brief explanation of drawings]

The drawings show an embodiment of the braking structure for running a working vehicle according to the present invention, and FIG. 1 is an overall side view of the tractor, and FIG. 2 is a schematic plan view of the main parts. 2a, 2b... Drive wheel, 8... Differential gear, 13a, 13b... Steering brake,
15a, 15b... Parking brake, 16a,
16b...Hood type pedal, 17...
Parking lever, 23... Engagement mechanism.

Claims (1)

[Claims] 1 Steering brakes 13a, 13b and parking brake 15 are provided in the transmission systems of the differential device 8 and the drive wheels 2a, 2b, respectively.
a, 15b are provided, and the steering brakes 13a, 13b are provided.
and the foot type pedals 16a, 16b, and the parking brakes 15a, 15b and the parking lever 1.
7 is interlocked and connected, and furthermore, the foot type pedal 16a
, 16b and the parking lever 17 are provided coaxially, and
A mechanism is provided between the foot pedals 16a, 16b and the parking lever 17 to operate the foot pedals 16a, 16b simultaneously by operating the parking lever 17 while allowing the foot pedals 16a, 16b to operate independently. Combiner mechanism 2
3, and by operating the parking lever 17,
The steering brakes 13a, 13b and the parking brake 15
A braking structure for traveling of a work vehicle configured to simultaneously brake both a and 15b.