JPH0840224A - Hand brake operating device on vehicle - Google Patents

Abstract

PURPOSE:To apply brake to the left and right brake devices by the light operation by a finger top, without utilizing the steering wheel operation, in the fine direction correction, as for a working vehicle equipped with the left and right independent brake devices in a rear wheel driving system and is equipped with the left and right valves for brake in the operating system of the brake device. CONSTITUTION:As for a working vehicle equipped with the left and right independent brake devices installed in a rear wheel driving system and the left and right valves 50a and 50b for brake arranged in an operating system for the brake device, a manual switch is installed in the vicinity of a driver's seat, and the manual switch 68 is interlocking-connected with the left and right valves 50a and 50b for brake, and the manual switch 68 is equipped with a lever which is always energized so as to be neutral, and only the valve for brake on the side where the lever is turned down in one between the left and right directions is operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual brake operating device suitable for industrial vehicles such as construction, transportation, agriculture and forestry, and particularly for agricultural tractors.

[0002]

2. Description of the Related Art Conventionally, as for the steering of a work vehicle, a driver operates a steering wheel to steer the front wheels while the driver is seated in the driver's seat, or the left and right independent brake pedals are stepped on separately. It is already known that the brake on this side is braked to steer.

[0003]

As is known in the art, in which the driver operates the steering wheel to steer the front wheels while sitting in the driver's seat, the driver uses the forearm. Since the operation was performed with a large amount of force, it was difficult to correct the fine direction due to the increased force. Further, in the case where the left and right independent brake pedals are operated by stepping on the brake pedals separately, it is difficult to correct the fine direction because the stroke of the brake pedal is large and it takes time and labor to change the brake pedal.

[0004]

SUMMARY OF THE INVENTION The present invention provides a work vehicle in which a rear wheel drive system is provided with left and right independent brake devices, and left and right brake valves (50a, 50b) are provided in an operation system of the brake device. , A manual switch (68) is provided near the driver's seat (10), the manual switch (68) is interlocked with the left and right brake valves (50a, 50b), and the manual switch (68) is always It has a lever (67) biased to be neutral, and when the lever (67) is tilted to the left or right, only the brake valve (50a, 50b) on the tilted side is operated. It constituted and solved the above-mentioned subject.

[0005]

According to the above structure, when the lever (67) of the manual switch (68) provided near the driver's seat (10) is tilted to the right with the fingertip of the right hand, the electric circuit is closed and the right brake valve (50a). ) To brake the right brake to steer the vehicle to the right and push the lever (67) of the manual switch (68) to the left with the fingertip of the right hand to close the electric circuit and brake the left brake. The vehicle valve (50b) is operated to brake the left brake to steer the vehicle to the left. As a result, the direction of the vehicle can be corrected to the left and right with a simple fingertip operation, making fine direction correction easier. It should be noted that when the fingertip is released from the lever (67) of the manual switch (68), the lever (67) is always urged to be neutral, so that the vehicle goes straight.

The reference numerals in the parentheses are for the purpose of contrasting with the drawings, but do not limit the structure of the present invention.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the tractor 1 as a mobile agricultural machine has front wheels 2a, 2b and rear wheels 3a, 3b.
The traveling body 5 supported by the
A transmission (transmission device) 4 equipped with a traveling clutch (not shown) is disposed in the lower part of the. On the other hand, in the left front wheel 2a, as shown in detail in FIG. 2, a corner angle sensor (corner angle detecting means) 7 having a pair of front and rear detectors.
Is mounted, and the knuckle arm 6 comes into contact with one of the detection parts when the knuckle arm 6 is fully steered in either the left or right direction. It is designed to detect that there is In this embodiment, one of the rear wheels 3a and 3b is actuated on the basis of the signal from the turning angle sensor 7, which constitutes a so-called quick turn device.

Further, an engine E, a radiator 8 and a battery B are sequentially installed in a bonnet 5a in front of the traveling machine body 5 (which means the left side in FIG. 1; the same applies hereinafter).
Are arranged along the traveling direction of. That is, the radiator 8 is arranged in front of the engine E in the bonnet 5a, and in front of the radiator 8 in the bonnet 5a, as shown in detail in FIG.
Is arranged. Further, a compressor 9 driven by a battery power source is arranged on the left side of the battery B, and a valve assembly A is arranged on the right side of the battery B.
Is arranged. This valve assembly A is shown in FIG.
As will be described in detail below, a switching valve (right brake valve 50a, which switches the air path from the compressor 9
Left brake valve 50b and clutch valve 51)
An air device such as a filter regulator R or the like is attached to the base plate.

On the other hand, as shown in detail in FIG.
Below the floor 5b of the
An air tank T is attached to a place where it is not splashed with water, and the air tank T is interposed between the compressor 9 and the filter regulator R (see FIG. 8) to temporarily store the air from the compressor 9. Is configured. In this way, the air equipment such as the compressor 9, the valve assembly A and the air tank T is
It is disposed in the space a or below the floor 5b, and is configured to supply air to the brake cylinders (brake actuators) 37 and 47 and the clutch cylinder 27 to operate them, as described later. .

On the other hand, behind the bonnet 5a, as shown in FIG. 1, a steering wheel S is provided upright, and behind the steering wheel S is a driver's seat 10. The main switch 1 is located at the lower right of the driver's seat 10.
3 and the brake switch 15 are arranged, and the quick turn device is activated when these switches 13 and 15 are turned on (details will be described later). In addition, the main shift lever 11 is provided on the left side of the driver's seat 10.
And a shuttle lever 12 are provided upright, and the transmission 4 can be shifted based on the operation of these levers 11 and 12. here,
Push-type switches 11a and 12a are attached to the grips of these levers 11 and 12, respectively,
When the switches 11a and 12a are pressed, the traveling clutch is disengaged by the air from the compressor 9 so that gear shifting is possible. Further, relays 60, 61, 62, 65 (see FIG. 7) operated by these switches 11a, 12a, 13, 15 etc. are appropriately arranged (details will be described later).

On the other hand, below the steering wheel S, as shown in FIG. 2, a pair of left and right brake pedals 30, 40 are provided.
Is swingably supported, and these pedals 30, 4 are
As shown in detail in FIG. 6, brake rods 31, 41, brake links 32, 42, and brake rods 33, 43 are sequentially connected to the respective ends of 0, and when the brake pedals 30, 40 are depressed. , The left and right rear wheels 3a and 3b are configured to operate. Further, on the lower side of the floor 5b, there are brake cylinders 37, 4
7 is swingably supported, and its rods 37a, 4
Member 3 having elongated holes 38a and 48a at the tip of 7a
8, 48 are attached. On the other hand, the brake links 32 and 42 are connected to the arm member 3 so as to rotate integrally.
6 and 46 are fixedly provided, and pins 36a and 46a are projectingly provided at the ends of the arm members 36 and 46, respectively. Therefore, when the brake pedals 30 and 40 are depressed, the pins 36a and 46a move in the elongated holes 38a and 48a, so that the clockwise rotation of the arm members 36 and 46 is not hindered and the brake operates smoothly. It is supposed to be done. The brake cylinders 37 and 47 are operated on the basis of the detection signal from the above-described turning angle sensor 7 to form a quick turn device.

Further, in the tractor 1 according to the present embodiment, the traveling clutch in the transmission 4 is operated by depressing the clutch pedal 20 and also by air as in the case of the brake pedals 30 and 40 described above. Is configured. That is, the clutch pedal 2 arranged between the brake pedals 30 and 40
As shown in FIG. 6, 0 is connected to the clutch arm 25 via the clutch rod 21, the clutch link 22, and the clutch rod 23, and the clutch arm 25 is rotated by the depression operation of the clutch pedal 20. Has been done. A clutch cylinder 27 is swingably supported by a chassis frame 5c arranged below the floor 5b, and the traveling clutch is operated by driving the clutch cylinder 27.
The clutch cylinder 27 and the clutch link 2
The connection structure with the brake cylinder 2 is similar to that of the above-described brake, and the clutch cylinder is provided through the member 28 having the elongated hole 28a and the arm member 26 fixed to the clutch link 22 and having the pin 26a protruding therefrom. 27 and the clutch link 22 are connected. When the clutch pedal 20 is stepped on, the pin 26a moves in the elongated hole 28a, so that the clockwise rotation of the arm member 26 is not hindered, and the clutch arm 25 operates smoothly. On the other hand, when the rod 26a is contracted by operating the clutch cylinder 27, the arm member 2
6 is rotated in the clockwise direction, and the clutch arm 25 is also activated. The clutch cylinder 27 has cylinder switches 29a, 29
b is attached, and the operating state of the clutch is detected based on the position of the sliding piston 27b (details will be described later). The cylinder switches 29a and 29b are movably attached, and are configured so that the positions of the cylinder switches 29a and 29b can be changed appropriately so that a running clutch, which will be described later, can be connected smoothly.

Next, an air circuit and an electric circuit for operating these brakes and clutches will be described with reference to FIGS. 7 to 11.

The air passage on the downstream side of the filter regulator R is divided into three, as shown in FIG.
A right brake valve (switching valve) 50a and a left brake valve (switching valve) are provided in each air passage.
50b and a clutch valve 51 are provided to selectively supply the air from the air tank T to the clutch cylinder 27 to engage and disengage the traveling clutch, or actuate the brake via the brake cylinders 37 and 47. Is configured. In addition, these valves 50a, 50b, 51
Silencers 52, 52, 52 are attached to the valve, and throttle valves 53, 53 are interposed between the left and right brake valves 50a, 50b and the brake cylinders 37, 47. Further, the air passage on the downstream side of the clutch valve 51 is branched into two and communicates with the clutch cylinder 27, and a half-clutch valve 55 is interposed in one air passage. An exhaust passage 57 with a throttle valve, in which a silencer 56 with a throttle valve is arranged, is connected to the half-clutch valve 55.

On the other hand, the electric circuit of this embodiment is constructed as shown in FIG. 7, and when the main switch 13 is turned on, the relay 60 is excited and the compressor 9 is driven. Further, when the switches 11a and 12a attached to the main shift lever 11 and the shuttle lever 12 are turned on, the relay 61 is operated and the clutch valve 51 is switched as shown in FIG. When the switches 11a and 12a are turned off, the relay 61 is immediately disconnected and the clutch valve 51 is switched to connect the traveling clutch.

When the traveling clutch is connected, the piston 27b of the clutch cylinder 27 is detected by the cylinder switch 29b, and the half-clutch valve 55 is switched. At this time, the cylinder switch 2 is moved along with the movement of the piston 27b.
Although 9b is turned off, the relays 62 and 65 are excited to hold the half-clutch valve 55 at the switching position. In addition, piston 2 which continued to move further
When the cylinder switch 29a detects 7b, the relays 62 and 65 are turned off and the half-clutch valve 5 is turned off.
5 is returned to its original position.

On the other hand, when the brake switch 15 is turned on to enable quick turn, the turning angle sensor 7
The brake valve 50a or 50b based on the ON signal of
Are switched, and the left and right brakes are selectively activated accordingly. Here, reference numeral 63 in the drawing is a high-speed switch provided in the transmission 4, which is turned off when the tractor 1 is traveling at a predetermined speed or higher (for example, when the sub-shift is in the H range), and quick. The turn function is configured not to operate.

Next, the operation of the quick turn device according to this embodiment will be described.

Now, when the main switch 13 is turned on, the relay 60 is excited and the compressor 9 is driven as shown in FIG. 7, and the air from the compressor 9 passes through the air tank T and the filter regulator R to the brake valve. It is supplied to 50a and 50b (see FIG. 8). When the brake switch 15 is turned on, a quick turn is possible. That is, when the tractor 1 is driven and the steering wheel S is fully turned in either the left or right direction (for example, 40 degrees), the knuckle arm 6 contacts and the turning angle sensor 7 is turned on. Then, one of the brake valves 50a and 50b is driven according to the steering direction, the brake of the rear wheel on the inside of the rotation is activated, and the traveling machine body 5 turns at the minimum radius. Specifically, when the steering wheel S is fully turned to the left, the brake of the left rear wheel 3a is activated and the rear wheel 3a is locked (see FIG. 9). Then
As is well known, the right rear wheel 3b rotates at a double speed by the action of a differential gear (not shown), and as a result, the traveling vehicle body 5 turns at the minimum radius. Then, when the steering wheel S is returned, the turning angle sensor 7 is turned off, the brake operation is stopped, and the left and right rear wheels 3a and 3b rotate at a constant speed. Here, when the tractor 1 is traveling at a predetermined speed or higher, the high speed switch 63 is turned off so that the quick turn function described above does not operate.

Next, the operation when the traveling clutch is operated by the push-type switches 11a and 12a at hand will be described.

Now, when the main switch 13 is turned on, the compressor 9 is started and air is sent to the clutch valve 51 as described above. However, switch 11
When a and 12a are off, the relay 61 operates as shown in FIG. 7, so that only the return solenoid is excited and the clutch valve 51 takes the position shown in FIG. Therefore, the rod 27a of the clutch cylinder 27 to which the air is supplied is projected and the traveling clutch is in the engaged state.

Here, when the switches 11a and 12a are pushed when operating the main shift lever 11 or the shuttle lever 12, the relay 61 is excited and switched, and the clutch valve 51 takes the position shown in FIG. Therefore, the rod 27a is pulled in by the air from the air tank T,
The arm member 26 shown in FIG. 6 rotates in the clockwise direction to disengage the traveling clutch. As a result, the operator can operate the main shift lever 11 or the shuttle lever 12 to any shift position. And the lever 11,
When the switches 11a and 12a are turned off after operating 12, the clutch valve 51 is switched again (see FIG. 10).
The rod 27a is extended and the traveling clutch is connected (see FIG. 11).

When the traveling clutch is connected, the piston 27b is detected first by the cylinder switch 29b and then by the cylinder switch 29a.
When 7b is detected and turned on, the half-clutch valve 55
The air from the clutch cylinder 27 is discharged through the silencer 6 with a throttle valve. Therefore, the moving speed of the piston 27b becomes slow, and the traveling clutch is slowly and slowly engaged. The cylinder switch 29b is turned off immediately after the piston 27b passes, but the relay 65 is excited to act as a kind of self-holding circuit, so that the half-clutch valve 5 is operated.
5 is retained in the switched state. Then, when the other cylinder switch 29a detects the piston 27b and is turned on, the relay 62 is switched, and as a result, the current supply to the half-clutch valve 55 is cut off and switched. Therefore, the air from the clutch cylinder 27 is sent to the clutch valve 51 and discharged from the silencer 52 without passing through the throttle valve. As a result, the moving speed of the piston 27b becomes faster, and the traveling clutch is engaged. That is, the traveling clutch is smoothly engaged by the half-clutch operation, as in the case where the traveling clutch is normally operated manually.

In FIG. 9, the brake valve 50a is shown.
Shows a state in which the clutch valve 51 is switched in accordance with the operation of the switches 11a and 12a.
The operation of b is performed independently of the operation of the clutch valve 51. When the switches 11a, 12a and 15 are off, the cylinders 27, 37 and 47 are connected to the rod 27.
The rods 27a, 37a, 47a have the members 28, 38, 48a having the elongated holes 28a, 38a, 48a as described above.
Since they are connected via 48, each pedal 20, 3
The operation of 0, 40 is not disturbed.

Next, the effect of this embodiment will be described.

As described above, in the present embodiment, the brakes for the left and right rear wheels 3a, 3b are operated by air, so unlike the case where they are operated by hydraulic pressure, power steering, etc. There is no risk of insufficient hydraulic pressure for operating the hydraulic equipment of. Further, even when the quick turn device according to the present embodiment is retrofitted, unlike the case where piping for oil supply is performed, there is no fear of oil leakage and the piping work is facilitated. Further, when the turning angle of the front wheel 2a reaches a predetermined angle, the turning angle sensor 7 arranged on the front wheel 2a detects the turning angle and the brake is automatically actuated. Therefore, the foot operates the brake pedal. There is no need and driving becomes easier.

On the other hand, the left and right brake valves 50a, 5
0b and the brake cylinders 37, 47 are provided with throttle valves 53, 53, and air is gently supplied to these cylinders 37, 47, so that the brake suddenly operates to lock the brake. I don't have to worry. Further, a high-speed switch 63 that is turned off during high-speed traveling is provided in the transmission 4 so that the cylinders 37, 47 can be operated during high-speed traveling.
Since the brake operation is stopped by, there is no concern about the quick brake operation during high speed turning.

On the other hand, a radiator 8 is arranged between the compressor 9 and the valve assembly A and the engine E, and the heat of the engine E is cut off by the radiator 8. Therefore, the compressor 9 and the like are unlikely to be affected by the heat of the engine E. Further, since the compressor 9 and the valve assembly A are arranged in the front part inside the bonnet 5a, and the obstacles such as the radiator 8 are not arranged in front of them, they are easily cooled by the wind of the cooling fan or the like, and therefore, due to heat generation. Trouble is reduced and it can always operate efficiently.

The battery B on the front of the bonnet 5a
Normally, the space on the side is vacant, and by arranging the compressor 9 and the valve assembly A at such a position, the battery B is secured in order to secure a dedicated space for arranging the compressor 9 and the valve assembly A. There is no need to change the position of the radiator 8 or the radiator 8. Therefore, these air devices can be installed inexpensively,
Also, air equipment can be retrofitted to tractors already on the market. Furthermore, by arranging the compressor 9 and the valve assembly A centrally in the front part of the bonnet 5a, repair and inspection are facilitated. Furthermore, since the compressor 9 and the valve assembly A are arranged inside the bonnet 5a, the appearance of the tractor is improved, and these air devices do not interfere with other work. In addition, other air equipment (for example, an inflator, a corrugated stapler) that uses the compressor 9 or the like can be mounted, and the equipment of the tractor can be easily increased.

Further, since the air tank T is attached to the inside of the step F below the floor 5b, the appearance is improved, and the air tank T is protected by the step F and is not easily damaged. Further, the cylinders 27, 37, 47 and the arm members 26, 36, 46 are engaged with each other by the elongated holes 28a, 38a, 4
Since it is performed through the members 28, 38, 48 having 8a, the operation of each pedal 20, 30, 40 is prioritized and safe. Furthermore, by providing the PTO lever on the right side, PTO shifting can be performed without using the foot.

In addition to the above-described structure, a manual switch 68 having a lever 67, which is always biased to be neutral, is provided on the right side of the driver's seat 10 as shown in FIGS. When the lever 67 of the manual switch 68 is tilted to the right with the fingertip of the right hand by wiring as shown in the electrical circuit diagram of 7, the electrical circuit is closed and the right brake valve 50a is closed.
Operates to brake the right brake and steer the tractor 1 to the right.

When the lever 67 of the manual switch 68 is tilted to the left with the fingertip of the right hand, the electric circuit is closed and the left brake valve 50b is activated to brake the left brake,
Steer the tractor 1 to the left. As a result, the tractor 1 can be corrected to the left or right with only a light fingertip operation.
Fine direction correction became easier. It should be noted that when the fingertip is released from the lever 67 of the manual switch 68, the lever 67 is always urged to be neutral, so that the tractor 1 goes straight.

[0034]

As described above, according to the present invention, the rear wheel drive system is provided with the left and right independent brake devices, and the left and right brake valves are provided in the operation system of the brake device. A manual switch is provided in the vicinity, the manual switch is interlocked with the left and right brake valves, and the manual switch has a lever urged to be always neutral. Since it is configured to operate only the brake valve on the collapsed side when tilted to one side, it is not necessary to operate the fingertip while going straight, and only when it is necessary to correct the direction of the vehicle left and right It is possible to make minor corrections with just the operation, making driving easier.

[Brief description of drawings]

FIG. 1 is a side view showing the overall structure of a tractor.

FIG. 2 is a plan view showing the entire structure of the tractor.

FIG. 3 is a plan view showing the arrangement of compressors and the like inside the bonnet.

FIG. 4 is a diagram showing a configuration of a valve assembly and other pneumatic equipment.

5 is a view for explaining the mounting position of the air tank, and is a view taken in the direction of arrow D in FIG.

FIG. 6 is a diagram for explaining a link mechanism for a traveling clutch and a brake.

FIG. 7 is an electric circuit diagram for explaining an electric circuit used in this embodiment.

FIG. 8 is a schematic diagram showing a non-operating state of a brake and a traveling clutch.

FIG. 9 is a schematic diagram showing a state in which a brake and a traveling clutch on one side are operating.

FIG. 10 is a schematic view showing a state immediately before connecting the traveling clutch.

FIG. 11 is a schematic diagram showing a state in which the traveling clutch is connected by a so-called half clutch.

[Explanation of symbols]

1 Mobile Agricultural Machine (Tractor) 2a, 2b Front Wheels 3a, 3b Rear Wheel 4 Transmission (Transmission) 5 Traveling Vehicle 5a Bonnet 5b Floor 7 Break Angle Detection Means (Cut Angle Sensor) 8 Radiator 9 Compressor 11 Main Shift Lever 11a Switch 12 Shuttle Lever 12a switch 13 Main switch 15 Brake switch 27 Clutch cylinder 29a, 29b Cylinder switch 30 Brake pedal 47 Brake actuator (brake cylinder) 40 Brake pedal 47 Brake actuator (brake cylinder) 50a, 50b Switching valve (for brake) 53) Throttle valve 51 Clutch valve 55 Half-clutch valve 57 Exhaust passage with throttle valve 63 Switch (high-speed switch) 67 Lever 68 Manual override Switch A valve assembly B Battery E engine T air tank

Claims (2)

[Claims] 1. In a work vehicle in which a left and right independent brake device is provided in a rear wheel drive system, and left and right brake valves are provided in an operation system of the brake device, a manual switch is provided near a driver's seat, and the manual switch is provided. A manual brake operating device in a vehicle, characterized in that the vehicle is linked with the left and right brake valves. 2. The manual switch has a lever biased so as to be always neutral, and when the lever is tilted to the left or right, only the brake valve on the tilted side is operated. The manual brake operating device for a vehicle according to claim 1, which is configured.