JPS6246592Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to an operating lever device for an agricultural tractor.

(B) Prior Art In conventional agricultural tractors, most operating levers such as the gear shift lever and clutch lever were installed upright from the upper surface of the clutch housing, transmission case, etc. around the seat.

(c) Problems that the invention aims to solve: Because the levers are located around the seat,
It is dangerous for the operator to trip or get caught when getting on or off the machine, and contact between these and the operator can cause the clutch to come into contact and cause the work equipment to suddenly rotate, causing an accident. There was a problem.

(d) Means for solving the problem In order to solve these problems, the present invention is constructed as follows.

A pivot shaft 12 is installed horizontally on the left and right dart board stays 40L and 40R, and the dart board stay 4
A clutch pedal 5 and brake pedals 6L and 6R are pivotally supported on a pivot shaft 12 that protrudes outward from the dash board stays 40L and 40R.
A high/low gear shift lever 3 and a PTO clutch lever 4 that protrude rearward between the inner sides of the 0R are pivotally supported.
When operating at high speeds or during non-operation, it is rotated upward to be in the protruding state, and when operating at low speeds or when not in use, it is rotated downward to be in the retracted state.

(E) Embodiment The purpose and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

Figure 1 is a side view of the engine, clutch housing, and the vicinity of the dash board, Figure 2 is an enlarged perspective view of the vicinity of the dash board, Figure 3 is a rear view, and Figures 4 and 5 are a plan view and side view of the lever. It is a diagram.

In FIG. 1, an engine 66 is fixed within a bonnet 71, a clutch housing C is fixed to the rear surface of the engine 66, and a transmission case M is fixed to the rear surface of the clutch housing C. A hydraulic oil tank 65 for a power steering device is provided above the engine 66.
The hydraulic oil in the hydraulic oil tank 65 is sucked into a power steering hydraulic pump 67 fixed to a gear case 70 on the side of the engine. Pressure oil is then discharged by the pump, sent to a hydraulic adapter 9b fixed to the front plate of the dash board, and controlled by the orbit valve 1b.

The gear case 70 of the engine 66 has two
Linked hydraulic pumps 68 and 67 are permanently installed.
As mentioned above, 67 is a hydraulic pump for power steering, and 68 is a hydraulic pump for rear hydraulic lift. Although the hydraulic pumps 68 and 67 are configured in a two-unit type, they are internally separate and constitute separate hydraulic circuits. Furthermore, an auxiliary hydraulic pump for other working machines attached to the agricultural tractor, such as a front loader and a snow blower, is provided on the front of the gear case 70 of the engine 66.

In the end, by providing the hydraulic pumps 68 and 67 as two-stage hydraulic pumps in separate circuits,
In addition, another auxiliary pump can now be installed. Conventionally, there were only two, front and rear, so the hydraulic pressure for other attached work equipment had to be extracted from the hydraulic pressure for the lift arm, which was troublesome, and since it was branched from the same hydraulic circuit, it was unavoidable. There were many problems in that it was affected by the control pressure of another hydraulic circuit, but by providing a dual hydraulic pump as in this example,
The hydraulic circuit can be configured as a separate circuit, making it compatible with a variety of uses for agricultural tractors.

Also, according to Figures 2, 3, 4, and 5,
Let me explain the structure of the control levers.

At the lower part of the dash board B at the rear end of the bonnet 71, a clutch pedal 5 and left and right brake pedals 6L and 6R are pivotally supported by a pivot shaft 12 on a dash board stay 40. Since the steering brake device is a hydraulic brake, this brake pedal 6
By depressing L and 6R, the left and right hydraulic pumps inside the brake valve case 8 are compressed to generate pressure oil, which is sent via piping to the actuator inside the rear axle housing to operate the hydraulic brake. .

An equalizer is configured within the brake valve case 8 and serves to equalize the oil pressure when the left and right brake pedals are depressed at the same time. This brake valve case 8 is fixed to the right front plate 40b of the front plate of the dart board stay. Further, a foot accelerator pedal 19 is pivotally supported on a pivot shaft 19a, and when the foot accelerator pedal 19 is depressed, an accelerator link 17 is activated via an arm 18.
is pulled and the accelerator is operated. Accelerator operation is this foot accelerator pedal 1
In addition to 9, there is an accelerator lever 15 which also pulls the accelerator link via an arm 16.

Reference numeral 55 designates a pivot tube for the accelerator pedal 19, which is fixed to the side plate 40R of the dart board stay.

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 section.

The power steering device uses hydraulic adapter 9
b, and the front plates 40a and 40b of the dash board stay of the safety valve 9c. The hydraulic adapter 9b receives pressure oil from a hydraulic pump fixed to the engine, and the safety valve 9c is used when the front axle swings and the hydraulic cylinder is forced to move when the steering wheel is turned all the way and the front axle is turned. This is a pressure oil relief valve. Further, an orbit valve 1b is provided at the lower end of the steering shaft 1a, and this is connected to the dart board stays 40L and 4.
It is fixed on a mounting base 59 installed between 0R.

The clutch pedal 5 is fixed to the outside of the dart board stay 40L on the left side of the pivot shaft 12.
Arm 21, link 22, bell crank arm 2
It is linked to 3.

Arm 2 is rotated by the rotation of bell crank arm 23.
4a and 32 are rotated simultaneously. The arm 24a operates the bell crank 26 and the link 30 via the link 24 to operate the inertia slip prevention brake switching hydraulic control valve. Further, by using the link 24', it is also possible to rotate the arm 25 that is pivotally supported on the pivot shaft 25 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. The pivot shaft 5a and the pivot shaft 38a in the middle of the clutch pedal 5
A clutch pedal depression force reducing device A is provided between the two.

The pedal force reduction device A includes a spring receiver 42 and a guide rod 3.
When the spring 43 crosses the line connecting the center of the pivot shaft 12 and the center of the pivot shaft 38a, the fulcrum is exceeded, and until then, the pedal force has been increased in the direction of increase. The biased spring 43 works to reduce the pedaling force.

A stopper 7, which prevents the clutch facing from sticking during long-term storage of the agricultural tractor, is arranged around the outer periphery of the pivot shaft 38a to engage with the locking body 41 of the clutch pedal 5 in the depressed state. To assemble the pivot shaft 38, use the dart board stay 40.
A cylinder 50L is fixed to the L side, and a cylinder 50R is fixed to the 40R side, into which the pivot shaft 38 is inserted, and the spacer 51 and the bell crank pivot cylinder 52 are loosely fitted. A retaining arm 47 and a retaining pin 46 are fixed to the right end of the pivot shaft 38. An extension pivot shaft 38a is screwed onto the left end of the pivot shaft 38.

PTO is located on the right side of the steering housing shaft 1a.
A clutch lever 4 and a height/low speed change lever 3 are provided on the left side.

Further, a tilt lever 2 of the steering handle is also provided on the left side in parallel with these two levers.

This invention is based on PTO clutch lever 4.
and regarding the height/low speed change lever 3,
In Fig. 2, the PTO clutch lever 4 is rotated upward and protrudes 4' when the PTO clutch is "engaged".
The PTO clutch is "disengaged" when it is rotated downward and is in a partially retracted state. Further, the height/low speed change lever 3 has a high speed when it is in an upwardly protruding state and a low speed when it is in a downwardly retracted state, and in both cases, the safe side is arranged in the lower retracted state.

The PTO clutch lever is provided with two-pronged rotation stoppers 4a and 4b at its tip, which abut against a pin 60 to stop further rotation. Wire 3 connected to pin 61 of PTO clutch lever 4 and PTO clutch hydraulic control valve 34
6 is pivoted. The hydraulic control valve 34 switches the hydraulic clutch device between "disengaged" and "engaged" states. A spring beyond the fulcrum is interposed between the pins 60 and 63 so that the lever is fixed in the "disengaged" and "engaged" states of the PTO clutch.

The height/low speed change lever 3 is also configured in a similar shape,
The height/low speed change is also constituted by a hydraulic clutch device, and is connected to the wire 37 of the height/low speed change control valve 35.

In this embodiment, the PTO clutch lever 4 is provided on the dash board, but it may also be a front PTO clutch lever or other operating lever. In any case, the lower storage state is always on the safe side.

(f) Effects of the invention Since the invention is constructed as described above, the following effects can be obtained.

First, the operating levers and pedals, which used to protrude near the seat, now protrude from the dart board, which eliminates the possibility of the operator getting caught or tripping over them when getting on and off the vehicle.

Second, since the operating lever protrudes from the dash board, the distance from the handle is short, allowing for quick response in the event of a flop.

Thirdly, since the operator is sitting in the seat during work, it is safe, so the lever in this case should be rotated upwards and protruding, so that when getting on and off, the lever will not touch the operator and cause a mistake.
Since the operating levers are rotated downwards and stored, they do not protrude from the dart board, reducing the probability of making a mistake when getting on or off, and even if a mistake is made during work, the levers will still rotate to the non-working side or to the low-speed side. Therefore, safety has improved.

Fourth, since the clutch pedal and brake pedal are placed on the same axis, it is easy to balance the positions of the left and right pedals, and only one shaft is required.

Fifth, since the levers and pedals protrude from the dash board, the arms and links can be stored inside the dash board, and they are connected to the outside from the dash board using wires or long links. The rotating part can now be protected and the connecting member can be easily installed.

[Brief explanation of the drawing]

Figure 1 is a side view of the engine, clutch housing and the vicinity of the dash board, Figure 2 is an enlarged perspective view of the vicinity of the dash board, Figure 3 is a rear view, and Figures 4 and 5 are a plan view and side view of the lever. It is. B...Dutch board, 3...High/low gear shift lever, 4...PTO clutch lever, 5...Clutch pedal, 6L/6R...Brake pedal, 12
... Pivot shaft, 40L/40R ... Datsushi board stay.

Claims (1)

[Scope of utility model registration request] A pivot shaft 12 is installed horizontally on the left and right dart board stays 40L and 40R, and the dart board stay 4
A clutch pedal 5 and brake pedals 6L and 6R are pivotally supported on a pivot shaft 12 that protrudes outward from the dash board stays 40L and 40R.
A high/low gear shift lever 3 and a PTO clutch lever 4 that protrude rearward between the inner sides of the 0R are pivotally supported.
An operating lever device for an agricultural tractor, characterized in that the lever rotates upward to be in a protruding state at high speeds or when working, and rotates downward to be in a retracted state when at low speeds or when not working.