JPH05464Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a braking device for a moving vehicle, and more specifically, to an improvement of a braking device for a moving vehicle such as an agricultural tractor having a pair of left and right brake pedals.

[Prior art] Conventionally, agricultural tractors have been equipped with brake devices that brake each rear wheel separately, and brake pedals that are operated by pressing the brake pedals.On the road, the left and right brake pedals are connected by an appropriate connector. When turning the aircraft in a field, the couplers are removed and only the brake pedal on the side to be turned is depressed.

[Problems that the invention aims to solve] By the way, as tractors become larger, it is necessary to ensure strong braking force, so it becomes necessary to provide braking devices not only for the rear wheels but also for the front wheels so that the front wheels can be braked at the same time. However, if a brake pedal is provided for the front wheels as well as a brake pedal for the rear wheels, the number of operation pedals will increase, which not only causes cost problems, but also complicates operations when stopping the aircraft and turning. This may cause problems with operation.

[Means for solving the problem] This invention is an agricultural tractor that has a braking device that can brake the front and rear wheels.In addition to being able to reliably stop the machine on the road, The purpose is to provide a braking device that can turn the aircraft in a small radius.

For this reason, the following technical measures were taken.

That is, it has a pair of left and right brake pedals 1, 2 and their master cylinders 14, 14, left and right independent front wheel braking devices 3, 4, and left and right independent rear wheel braking devices 5, 6, and the master cylinder 14, 14 and each braking device 3, 4, 5, 6, the input side of the valve box 18 is connected to the master cylinders 14, 14 and the oil passages. Two input ports 18a and 18b are provided which communicate via ports 16 and 17, and front wheels 10 and 11 and rear wheel 1 are provided on the output side.
Four output ports 18c, 18d, 18e, 1 communicate with each of the braking devices 3, 4, 5, 6 of No. 2 and 13, respectively.
Output ports 18c and 18f that communicate with the rear wheel brakes 5 and 6 are located on the outside in the longitudinal direction of the valve box 18, and output ports 18d and 18e that communicate with the front wheel brakes 3 and 4 are located on the inside. They are arranged in the valve box 18 so that
A switching device 7 that connects or blocks oil passages to the front wheel brake devices 3 and 4 is slidably fitted inside the brake pedal, and when both brake pedals 1 and 2 are operated simultaneously, the switching device 7 stops at a neutral position. Each input port 18a, 18b
The two output ports 18c, 18d, and 18f of the front and rear wheels on the corresponding side communicate with each other, and when either the left or right brake pedal 1 or 2 is operated, the switching device 7 slides from the neutral position to one side. Output port 18d, 1 communicating with the front wheel brake device on the operated side
8e is closed, and hydraulic oil is configured to flow into output ports 18c and 18f communicating with rear wheel brakes 5 and 6 on the operated side.

[Example] Hereinafter, an example of this invention will be described based on the drawings. The mobile vehicle shown in FIG. 2 is a schematic plan view of a tractor 8, which has front wheels 10, 11 and rear wheels 12, 13, and obtains rotational power from an engine (not shown) to move the vehicle forward. Or retreat.

Braking devices 3, 4, 5, 6 are provided for the front wheels 10, 11 and the rear wheels 12, 13, respectively, for braking the wheels separately.
are provided, and these are operated by brake pedals 1 and 2, which will be described later.

That is, brake pedals 1 and 2 of the suspension pedal type are suspended from the control section, and when they are depressed, the master cylinders 14 and 2, which are provided on the left and right sides respectively, are activated.
14 is pressed, and the corresponding oil passages 15, 1
6, 17 and into the cylinders 23, 23, 23, 23 in the braking devices 3, 4, 5, 6.

18 is a valve box, and as shown in FIG. 1, two ports 18a and 18b are provided on the input side, and these are connected to the oil passages 16 and 17.
On the output side, there are four ports 18c, 18d,
18e and 18f are provided, and these are oil passage 2.
1, 19, 20, and 22, respectively, to the left rear wheel 1.
2. Left front wheel 10, right front wheel 11, right rear wheel 13
The brakes 5, 3, 4, and 6 are connected to the brakes 5, 3, 4, and 6.

Reference numeral 7 designates a spool valve type switching valve that is fitted and fitted inside the valve box 18 so as to be slidable in the left and right directions, and has through holes 26 and 27 with an L-shaped cross section on the left and right sides. When pressure oil acts on the oil passages 16 and 17 at the same time, the switching valve 7 is in a balanced position in the center, and when the right or left brake pedal 1 or 2 is depressed, it is possible to switch to either oil passage 16 or 17. When hydraulic oil flows in, this switching valve 7 moves in either the left or right direction. In addition, 24, 25
is a return spring that returns this switching valve 7 to the neutral position.

In the state shown in Fig. 1, when either the left or right brake pedal 1 or 2 is depressed, the switching valve 7 moves from the neutral position to the left or right, and the front wheel 1 moves from the neutral position to the left or right.
The braking devices 3 and 4 on the 0 and 11 sides are inhibited from operating, and only the side where the rear wheel brake pedal is depressed is braked, and the aircraft makes a sharp turn to the left or right. When both brake pedals 1 and 2 are depressed at the same time, the switching valve 7 is balanced at the neutral position and the front wheels 10, 11,
All of the rear wheels 12 and 13 can be braked.

[Effects of the invention] Since this invention is configured as described above, it has the following technical effects.

That is, it has a pair of left and right brake pedals 1, 2 and their master cylinders 14, 14, left and right independent front wheel braking devices 3, 4, and left and right independent rear wheel braking devices 5, 6, and the master cylinder 14, 14 and each braking device 3, 4, 5, 6, the input side of the valve box 18 is connected to the master cylinders 14, 14 and the oil passages. Two input ports 18a and 18b are provided which communicate via ports 16 and 17, and front wheels 10 and 11 and rear wheel 1 are provided on the output side.
Four output ports 18c, 18c, 18d, 1 communicate with each of the braking devices 3, 4, 5, 6 of 2 and 13, respectively.
8e and 18f are provided, and these output ports are connected to output ports 18c and 18 which communicate with the rear wheel brake devices 5 and 6.
f is located on the outside in the longitudinal direction of the valve box 18, and the front wheel brake device 3,
A sliding switching device 7 is provided in the valve box 18 in such a way that the output ports 18d and 18e that communicate with the front wheel brakes 4 are arranged on the inside, and in the valve box 18, the switching device 7 communicates or blocks the oil passages to the front wheel brake devices 3 and 4. When they are fitted freely and both brake pedals 1 and 2 are operated simultaneously, the switching tool 7 stops at the neutral position and each input port 18a,
18b and the corresponding two output ports 18c, 18d, 18e, and 18f of the front and rear wheels communicate with each other, and when either the left or right brake pedal 1 or 2 is operated, the switching device 7 slides from the neutral position to one side. The output ports 18d and 18e that communicate with the front wheel brake device on the operated side are closed, and the output ports 18c and 1 communicate with the rear wheel brake device 5 and 6 on the operated side.
It is designed so that hydraulic oil flows through the 8th f, so if you operate the brake on one side in the field,
The switching device 7 slides from the balanced neutral position to either the left or right, and the oil path 1 to the front wheel brake devices 3 and 4 is opened.
9 and 20 are blocked. Therefore, the brakes on the front wheels 3 and 4 are not applied, but only the corresponding rear wheels are braked, allowing the aircraft to turn smoothly with a relatively small radius.

Furthermore, when both brake pedals 1 and 2 are depressed simultaneously, the switching tool 7 inside the valve box 18 stops at the neutral position.
The hydraulic oil sent from the master cylinders 14, 14 is sent to the front wheels and can brake all four wheels, making it possible to reliably stop the aircraft within a short distance.

Moreover, in this case, whether to brake all four wheels or only the rear wheels is automatically determined by the pressure balance from the left and right directions on the switching device 7 provided in the valve box 18, so special There is no need to open or close a switching valve or a switching valve, making it easy to operate and reducing erroneous operations.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, with FIG. 1 being a partially sectional view for explaining the operation, and FIG. 2 being a schematic plan view of the main parts. Explanation of symbols, 1, 2...Brake pedal, 3,
4, 5, 6...braking tool, 7...switching tool (switching valve),
10, 11...front wheel, 12,13...rear wheel, 18
...Ben box.

Claims (1)

[Scope of utility model registration request] It has a pair of left and right brake pedals 1, 2 and their master cylinders 14, 14, left and right independent front wheel braking devices 3, 4, and left and right independent rear wheel braking devices 5, 6, and the master cylinder 14,
14 and each braking device 3, 4, 5, 6, the input side of the valve box 18 is connected to the master cylinders 14, 14 and the oil passages. Two input ports 18a and 18b are provided which communicate via ports 16 and 17, and front wheels 10 and 11 and rear wheels 12 and 1 are provided on the output side.
Four output ports 18c, 18d, 18e, 18f are provided which communicate with the rear wheel brake devices 5, 6, respectively, and these output ports communicate with the rear wheel brake devices 5, 6, respectively. are arranged in the valve box 18 so that the output ports 18d and 18e communicating with the front wheel brakes 3 and 4 are on the inside in the longitudinal direction of the valve box 18, and the front wheel brakes 3, A switching device 7 that connects or blocks oil passages to the brake pedals 1 and 4 is slidably fitted to the brake pedals 1 and 4.
2 are operated at the same time, the switching tool 7 stops at the neutral position, and each input port 18a, 18b and the two output ports 18c, 18c of the front and rear wheels on the corresponding side,
18d, 18e, and 18f communicate with each other, and when either the left or right brake pedal 1 or 2 is operated, the switching device 7 slides from the neutral position to one side and communicates with the operated front wheel brake device 18d. ,1
8e is closed, and hydraulic oil flows to output ports 18c and 18f communicating with rear wheel brakes 5 and 6 on the operated side.