JPH0313101B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a dart board device for a large agricultural tractor and an operating system in the vicinity thereof.

(b) Prior Art Conventionally, the technology of arranging the brake pedal at the bottom of the dart board has been known. For example, there is a technique described in Japanese Utility Model Publication No. 51-11771.

(c) Problems to be solved by the invention When a tractor becomes large, the clutch housing and transmission case become large, but the operator does not become large, so if the seat and support for the pedals and levers of the operating system are small. The result is different.

In small tractors, the operator used to sit astride the clutch housing and transmission case that were connected to operate the tractor.
As the vehicle gets larger, the width of the clutch housing also increases, making it impossible to spread your legs and straddle it, and end up riding on top of it.

Pedals and levers that were conventionally located on the sides or top of the clutch housing and transmission case are now all gathered in front of the seat.

The present invention brings all these together in a compact manner,
In order not to interfere with the operator getting on and off the vehicle, the dart board stays below the dart board are grouped together in this area as a support.

By gathering the pedals and levers on the dash board in this way, when the cabin is installed, the pedals and levers do not protrude from various places inside the cabin, and by sealing the cabin and the dash board, the entire operating section and the cabin can be sealed. Since a seal can be formed, the degree of airtightness of the cabin can be improved, and even if there is no cabin, the assembly as a whole can be made easier.

(d) Means for solving the problems The problems to be solved by the present invention are as described above.
Next, means for solving the problem will be explained.

In a configuration in which the dash board B is fixed to the cabin D and can be rotated rearward by integrating the dash board B and the cabin D, the left and right dash board stays 40
L, 40R, and the dart board stay 4
A pivot shaft 12 is supported between 0L and 40R, and on the right pivot shaft 12 of the dart board stay 40R,
The left and right brake pedals 6L and 6R are pivotally supported, the clutch pedal 5 is pivotally supported on the outer pivot shaft 12 of the dart board stay 40L, and the brake valve case 8 is arranged on the right side of the dart board stay 40R. , a clutch pedal depression force reducing device A is disposed on the left side of the dash board stay 40L, and an orbit valve 1b is fixed to a mounting base 59 disposed between the dash board stays 40L and 40R.

(E) Embodiment The problems to be solved by the present invention and the means for solving them are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

Figure 1 shows the cabin installed and the cabin rotated and tilted around the fulcrum for repair and inspection. Figure 2 is a side perspective view of the dash board stay, and Figure 3. 4 is a rear view, and FIG. 4 is a front view of the dart board stay.

In Figure 1, the cabin D is installed from the rear of the bonnet E to the rear of the fender.
The cabin D can be rotated and tilted to a position D' about a rotation fulcrum behind the rear axle housing F.

At that time, the dash board B at the rear of the hood is assembled integrally with the cabin D, and when the cabin D is rotated and tilted, the steering handle 1, the dash board B, and the clutch pedal and brake pedal attached thereto, In addition, both the accelerator pedal and accelerator lever can be rotated.

These levers and pedals are linked to the engine, clutch housing C, and transmission case M, so the wires are
It is made long to provide extra room, and the links form parts that can be easily removed to break the connection.

With this configuration, it is possible to solve the problem of a tractor with a cabin that it is difficult to inspect and repair due to the attached cabin.

Referring to FIGS. 2 and 3, the configuration of the lower part of the dart board stay 40 of the dash board B will be explained.

Clutch pedal and left and right brake pedals 6
L and 6R are pivotally supported by the dash board stays 40L and 40R of the dash board B. That is, the pivot shaft 12 is the pivot shaft of the clutch pedal 5 and the left and right steering brake pedals 6L, 6R.

Since the steering brake device is a hydraulic brake,
By depressing the brake pedals 6L and 6R, the left and right hydraulic pumps in the brake valve case 8 are compressed to generate pressure oil, which is sent via piping to the actuator in the rear axle housing to operate the hydraulic brake. It is. An equalizer is configured within the brake valve case 8 to equalize the oil pressure when the left and right brake pedals are depressed simultaneously.

This brake valve case 8 is fixed to the rear surface of the right front plate 40b of the front plate of the dart board stay.

Further, the foot accelerator pedal 19 is connected to the pivot shaft 19a.
It is pivoted to the arm 18, and when you step on it, arm 18
Through this, the accelerator link 17 is pulled and the accelerator is operated. The accelerator operation is
In addition to the foot accelerator pedal 19, there is also an accelerator lever 15, and by rotating the accelerator lever 15 back and forth, the arm 15a is rotated, and the accelerator link 17 is also pulled via the arm 16. 55 is a foot accelerator pedal 19 fixed to the side plate 40R of the dart board stay.
It is the pivot tube of. Further, the steering handle 1 is a tilt handle that can be rotated back and forth according to the physique of the operator. That is, the steering handle 1 can be bent freely within the steering handle support 11, and the upper part of the steering handle 1 can be rotated back and forth about the pivot shaft 10. Reference numeral 2 denotes a tilt lever, which is rotated to fix or loosen the handle tilt portion.

The steering device is a power steering device, and has a hydraulic adapter 9b and a safety valve 9c fixedly installed on the front surfaces of front plates 40a and 40b of the dart board stay. The hydraulic adapter 9b inherits pressure oil from a hydraulic pump fixed to the engine, and the safety valve 9c is used to prevent the front axle from swinging when the steering wheel is turned all the way and turning, forcing the hydraulic cylinder to move. This is a pressure oil relief valve.

In addition, there is an orbit valve 1 at the lower end of the steering shaft.
b, which is fixed on a mounting base 59 installed between the dart board stays 40L and 40R.

13 is a spring that biases the tilt handle 2 in the fixed direction, 4 is a PTO clutch lever, and 3 is a high/low speed change lever. These two levers are pivotally supported inside the dart board stays 40L and 40R and are juxtaposed. It is connected via wires 36 and 37 to a hydraulic control valve 35 for high/low speed change on the transmission case M and a hydraulic control valve 34 for a PTO clutch. The clutch pedal 5 is fixed to the outside of the dart board stays 40L and 40R on the left side of the pivot shaft 12, and includes an arm 21, a link 22,
It is linked to the bell crank arm 23.

The rotation of the bell crank arm 23 causes the arms 24a and 32 to rotate simultaneously. Arm 24a
The bell crank 26 and the link 30 operate the inertia slip prevention brake switching hydraulic control valve via the link 24 and the link 30, respectively. Further, by using the link 24', the arm 25 pivotally supported on the pivot shaft 25 can be rotated to operate the mechanical inertial slip prevention device.

The arm 32 also connects and disconnects the main clutch within the clutch housing C via a link 33. In such a clutch device, a clutch pedal depression force reducing device A is provided between the pivot shaft 5d in the middle of the clutch pedal 5 and the pivot shaft 38a.

The pedal force reduction device A includes a spring receiver 42 and a guide rod 31
When the spring 43 crosses the line connecting the center of the pivot shaft 12 and the center of the pivot shaft 38a, a fulcrum crossing occurs, and until then, the pedal force has increased in the direction of increase. The biased spring 43 acts in the direction of reducing the pedaling force.

Further, a stopper 7 on the outer periphery of the pivot shaft 38a that prevents the clutch facing from sticking during long-term storage of the agricultural tractor engages with the locking body 41 of the clutch pedal 5 in the depressed state, thereby maintaining the depressed state. be.

To assemble the pivot shaft 38, a tube 50L is fixed to the dash board stay 40L, and a tube 50R is fixed to the dash board stay 40R, and the pivot shaft 38 passes through these. At this time, the spacer 51 and the bell crank pivot tube 52 are loosely fitted. An arm 47 is welded to the right end of the pivot shaft 38 and serves as a stopper, and a similarly fixed pin 46 serves as a rotation stopper.

A bolt portion of an extended pivot shaft 38a is screwed onto the left end of the pivot shaft 38 to fix the left side. The stopper 7 and the guide rod 31 of the pedal force reduction device are loosely fitted to the extension pivot shaft 38a.

FIG. 4 is a front view of the dart board stay 40, in which the front plate 40a is provided with a piping hole 56 for power steering, and the front left plate 40a is also provided with a piping hole 56 for power steering.
Piping hole 5 for power steering also in 0b
7 is drilled.

58 is a piping hole for the hydraulic brake.

(F) Effects of the Invention Since the present invention is configured as described above, it has the following effects.

First, by integrating the dash board B into the cabin D, the operating parts are concentrated on the side of the cabin D, so that a sealing mechanism between the tractor body side and the side of the cabin D can be easily constructed.

Furthermore, a mechanism for rotating the cabin D for inspection and repair can be easily constructed.

Second, the dart board stay 40 is attached to the mounting base 5.
9, the dart board stays 40L, 40R, and the pivot shaft 12, it has a strong structure and can reliably support the clutch pedal 5, left and right brake pedals 6L, 6R, etc.

Thirdly, the clutch pedal 5, the left and right brake pedals 6L, 6R, the brake valve case 8, the clutch pedal depression force reduction device A, the orbit valve 1b, etc. can be placed in easy-to-operate locations, so the link The configuration was also simpler.

[Brief explanation of the drawing]

Figure 1 shows the cabin installed and the cabin rotated and tilted around the fulcrum for repair and inspection. Figure 2 is a side sectional view of the dash board stay. Figure 3. 4 is a rear view, and FIG. 4 is a front view of the dart board stay. A...Clutch pedal depression force reduction device, B...
Dash board, D...cabin, 5...clutch pedal, 6L, 6R...brake pedal, 8...
...Brake valve case, 1b...Orbit valve, 12...Pivot shaft, 40L, 40R...Dutch board side plate, 59...Mounting base.

Claims (1)

[Claims] 1 In a configuration in which the dash board B is fixed to the cabin D, and the dash board B and the cabin D are integrated and can be rotated rearward, the dash board B
In the vertical direction of the left and right needle board stays 40
L, 40R, and the dart board stay 4
A pivot shaft 12 is supported between 0L and 40R, and on the right pivot shaft 12 of the dart board stay 40R,
The left and right brake pedals 6L and 6R are pivotally supported, the clutch pedal 5 is pivotally supported on the outer pivot shaft 12 of the dart board stay 40L, and the brake valve case 8 is arranged on the right side of the dart board stay 40R. , an agricultural tractor characterized in that a clutch pedal depression force reducing device A is arranged on the left side of the dart board stay 40L, and an orbit valve 1b is fixed to a mounting base 59 arranged between the dart board stays 40L and 40R. Datsushi board equipment.