JPS6330592Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a braking structure for traveling equipped with brakes that brake left and right traveling devices separately.

In the above braking structure, conventionally, one operating tool and the left and right brakes were linked by separate operating systems, so even if extremely severe adjustments were made, the left and right brakes could not be applied with equal braking force. It was difficult to apply the brakes at the same time, and it was easy for the brakes to be applied one-sidedly or to have a delay in braking, and there was a high risk of skidding or sudden turns. In addition, in the past, as a way to eliminate the one-sided brake condition, for example,
-The one disclosed in Publication No. 9444 is known, but since this has a structure in which the brake is operated via a rod or cam link, the number of parts increases, and the shaft, cam link, etc. must be precisely assembled. There were drawbacks such as the need for processing and increased manufacturing costs.

In view of the above-mentioned circumstances, it is an object of the present invention to provide an operation system for the left and right brakes with a simple structure so that the left and right brakes can be operated simultaneously.

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

An engine 3 is mounted on the rear side of a vehicle body 2 provided with left and right traveling devices 1, 1, and the traveling device 1,
1 is interlocked and connected to the engine 3, a pair of left and right brackets 5, 5 are erected on both sides of the engine 3 and at the rear of the vehicle body, and a working device 6 is attached to the brackets 5, 5. A driver's seat 7 is disposed on the top of the traveling drive structure 4, and steering levers 8, 8, a foot-operated brake operating tool 9, and operating device operating levers 10, 10 are arranged in front of the seat 7. It is configured as a work vehicle.

The traveling drive structure 4 includes two sets of drive devices 11 that integrate a variable displacement fluid pressure pump (P) and a motor (M) connected to it in a closed circuit.
11, the pump input shafts 12, 12 are connected to each other by spline fitting of a cylindrical body 13, and a pair of bevel gears 15, 15 is spline fitted between this cylindrical body 13 and the output shaft 14 of the engine 3. do,
Engine power is taken out to the motor output shafts 16, 16 so as to be able to rotate forward, reverse, and stop independently.

Then, a pair of transmission gears 19, 18 are fitted to the left and right main rotating shafts 17 for traveling and the motor output shaft 16, and the transmission gears 19, 19 fitted to the main rotating shafts 17, 17 for traveling are Main rotating shaft for traveling 1
7, 17 along the axial direction of the transmission gear 18,
The rotary shaft 17 and the axle shafts 20
A sprocket wheel 23 for winding the chain 22 is provided on the intermediate shaft 21, and the rotating shaft 1
Disc brakes 24 and 24 are provided for each of the left and right traveling devices 1 and 17, respectively, for braking separately.
These are separately driven to enable forward and backward travel as well as steering including spin and pivot.

The disc brakes 24, 24 are configured by a pair of members 26, 27 provided with a brake lining 25, which are slidably mounted on a pin 29 installed in the gear case 28 parallel to the rotating shaft 17. , these paired members 26 and 27 are located on both sides of the respective circumferences of the transmission gears 19 and 19, and a compression spring 3 is placed between the members 26 and 27.
A cam 31 with an oval cross section
is attached to the gear case 28 via the member 33 so as to be freely rotatable around an axis perpendicular to the gear rotation axis and to be able to swing slightly in the sliding direction of the member 26. is positioned between the pair of operating members 26, 26, and the rotary cam 31 and the foot-operated brake operating tool 9 are interlocked and connected by a mechanical link mechanism 32, so that when the operating tool 9 is depressed, Therefore, when the cam 31 is rotated, the cam surface of the cam 31 that becomes wider as it rotates comes into contact with the members 26, 26, so that the paired members 26, 26 slide in the direction away from each other. The pair of members 26 and 27 clamp the circumferential portion of the transmission gear, that is, the transmission gears 19 and 19 serve as brake discs to apply braking force to the rotating shafts 17 and 17, and the left and right traveling devices 1 and 1 are separated from each other. brake 2
It is designed to brake at 4,24.

During this braking operation, since the rotary cam 31 is swingably mounted, if one of the brakes 24 comes into the braking state first during the braking operation, the cam 31 will move while maintaining the braking state. It moves so as to apply braking force to the other brake 24, that is, by self-adjustment by the rocking of the cam 31, it becomes possible to apply operating force equally and simultaneously to both brakes 24, 24. ,
It is possible to avoid situations where the brakes are not working properly or there is a delay in braking.

The brake linings 25 of the operating members 26 and 27 are shaped so as not to come into contact with the teeth of the gear 18, as shown in FIG.

Further, in order to attach the cam 31 to the case 28 so as to be able to swing freely, a hole is bored in the case wall and the cam 31 is attached to the case 28 so as to be able to swing freely.
Various modifications are possible, such as mounting 1 in a rattling manner or mounting via a spherical bearing.

In summary, the traveling braking structure according to the present invention has a pair of transmission gears that separately transmit power from the driving unit to a pair of left and right traveling devices, respectively, on separate left and right shafts arranged on a single axis. The two transmission gears are configured to be slidable along the axial direction of the two shafts, and the transmission gears are configured to be slidable along the axial direction of the two shafts, and a pair of operation controls are arranged on the left and right side surfaces of each of the transmission gears, respectively. A brake is constituted by a member that clamps and brakes the transmission gear, and further, a rotary cam interlocked with an operating tool is provided between the operating members disposed between both the transmission gears. The operating member is configured to be slid in a direction in which the operating member is moved away from each other by contact with the cam due to rotation of the cam accompanying a braking operation, and the rotating cam is moved in the sliding direction of the operating member. The characteristic configuration is that the device is slidably attached to the device.

In other words, since the brake is configured to apply pressure directly to the transmission gear, the transmission gear also serves as a braking member, which reduces the number of parts that make up the brake, and allows the transmission gear to Since it is clamped by the operating member and is slidable along the axial direction of the shaft that supports these transmission gears, and the rotary cam is also slidable, the left and right brakes can be applied almost simultaneously. It has now been possible to obtain an inexpensive braking device for driving with a simple structure, which can perform braking operations reliably even with uniform braking force, and can avoid dangerous situations caused by one-sided braking or braking time delays.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of drawings]

The drawings show an embodiment of the traveling braking structure according to the present invention, in which Figure 1 is an overall side view of a working vehicle, Figure 2 is a traveling drive system diagram, and Figure 3 is a partially expanded view of the main components of the traveling drive system. FIG. 4 and FIG. 5 are cross-sectional views of main parts, respectively. 1... Travel device, 9... Operation tool, 17... Axis,
19...Transmission gear, 24...Brake, 26,2
7... Operating member, 31... Rotating cam.

Claims (1)

[Scope of utility model registration request] The power from the driving part is transferred to a pair of left and right running devices 1,
A pair of transmission gears 19, 19 each transmitting data to 1 separately.
, separate left and right shafts 17, 17 arranged on one axis
The two transmission gears 19, 19 are configured to be slidable along the axial direction of the two shafts 17, 17, respectively, and each of the transmission gears 19, 19 is Brakes 24, 2 that brake the transmission gears 19, 19 by clamping them with a pair of operating members 26, 27 arranged on both left and right side surfaces, respectively;
4, and further includes both transmission gears 19, 19.
One rotary cam 31 interlocked with the operating tool 9 is provided between the operating members 26, 26 disposed between the operating members 26, 26, and the rotation of the cam 31 caused by the braking operation causes the rotation of the cam 31. The operating members 26, 26 are configured to slide in a direction away from each other by abutment, and the rotary cam 31 is mounted in a slidable state in the sliding direction of the operating members 26, 26. Braking structure for driving.