JPH0236747Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention enables simultaneous operation of the engine control lever and hydraulic transmission control lever of a mobile agricultural machine such as a hydraulically driven tractor.
The present invention relates to a control device for a mobile agricultural machine that integrally adjusts engine rotation and rotation of a hydraulic transmission during traveling.

Conventionally, in control devices for mobile agricultural machinery such as tractors, the engine control lever and the hydraulic transmission control lever were provided separately, and each could only be operated separately.When adjusting the traveling speed, the engine speed was increased, and then the hydraulic I had to operate the transmission controls to high speed.

For this reason, when shifting from low speed to high speed, the shock becomes large due to the stepwise speed change, and if the hydraulic transmission control is operated in the wrong order of operations first, the engine will often run at low speeds, resulting in low output. It was causing the engine to stall.

This is a hydraulic transmission control operation.
Forward ← → Neutral ← → Reverse, but the engine control operation is Low ← → High or High ← → Low, so if you make a mistake in the operation procedure, the speed will be low when you want it to be high, or vice versa. It was difficult to operate, as it sometimes became difficult to operate.

The present invention was developed in view of the above-mentioned circumstances, and includes a hydraulic transmission control lever and an engine control lever that are installed in parallel, and when the hydraulic transmission control lever is in a neutral state, the engine control lever rotates at a low speed. To provide a control device for a mobile agricultural machine in which an engine control lever is interlocked to rotate at high speed when a hydraulic transmission control lever moves forward or backward.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 8.
This will be explained in detail based on the figures.

FIG. 1 is a side view showing a schematic configuration of a control device according to the present invention, in which 1 is an engine, 2 is a clutch housing, 3 is a hydraulic transmission, 4 is a tank bracket, 5 is a hydraulic control lever guide, and 6 is a hydraulic control lever. , 7 is an engine control lever, 8 is a hydraulic control arm, 9 is a rod A, 10 is a bracket, 11 is a link plate, 12 is a rod B, and 13 is a step.

Fig. 2 is a detailed view of the hydraulic control lever 6 and engine control lever 7, and Fig. 3 is a detailed view of the hydraulic control lever 6 and engine control lever 7.
It is an exploded perspective view showing the main parts of the figure, 14 is a hydraulic control shaft, 15 is a hydraulic lever arm,
16 is a disc spring, 17 is a cam plate, 18 is a link, 19 is an engine control rod, 20 is an engine throttle arm, and 21 is a disc spring.

Figures 4 to 6 are explanatory diagrams of the main parts showing the operating state of the engine control. Figure 4 shows the operation of the engine control lever 7 during low-speed idling, and Figures 5 and 6 show the operation of the engine control lever 7 during high-speed rotation. Indicates operation status.

Also, Figure 7 shows the engine control lever 7.
FIG. 4 is an explanatory diagram showing the relationship between the hydraulic transmission control lever 6 and the hydraulic transmission control lever 6. FIG.

Further, the cam plate 17 operated by the engine control lever 7 is formed with a V-shaped cam follower 17a as shown in the figure, and the movable arm 7a of the engine control lever 7 engages with this cam follower 17a. An operating fulcrum 18a of a link 18 that pulls the engine control rod 19 is fixed to one end of the cam plate 17.

Therefore, when the engine control lever 7 is operated to the forward or backward position, the movable arm 7a presses the inclined surface of the V-shaped cam follower 17a of the cam plate 17, and the cam plate 17 moves to the operating fulcrum 18.
Rotate around a in the direction of arrow a, link 18,
An engine throttle arm 20 is actuated via an engine control rod 19 to rotate the engine 1 at high speed.

Next, the operation of the control device configured as described above will be explained.

First, the hydraulic transmission 3 is controlled by operating the hydraulic control lever 6 to the forward or backward position.
4, the hydraulic control arm 8 is moved forward or backward via the hydraulic lever arm 15, through the rod B12, the link plate 11, and the rod A9, thereby adjusting the speed and switching between forward and backward.

On the other hand, the control of the engine 1 is configured so that the engine control lever 7 rotates at a high speed regardless of whether the engine control lever 7 is operated in the forward or backward direction from the low speed position, as shown in FIGS. 4 to 6. The engine can be made to rotate at high speed in accordance with the operation of the control lever 6 in the forward or backward direction.

That is, the fulcrums of the hydraulic transmission control lever 6 and the engine control lever 7 are coaxial, and the positional relationship between the levers is as shown in FIG.
The neutral state of the engine control lever 7 and the low speed state of the engine control lever 7 are set to coincide with each other, and the tips of the grips of the levers are bent to face each lever so that they are close to each other, so that they can be gripped and operated at the same time. It is composed of

Therefore, when the levers 6 and 7 are operated in the backward direction, the movable arm 7a of the engine control lever 7 moves to the V of the cam plate 17 as shown in FIG.
By pressing the shaped cam follower 17a and rotating the cam plate 17 around the operating fulcrum 18a, both the hydraulic transmission 3 and the engine 1 become high speed, and when they are moved forward, the movable arm 7a moves as shown in FIG. The V-shaped cam follower 17a of the cam plate 17 is pressed to rotate the cam plate 17 around the operating fulcrum 18a, the hydraulic transmission 3 is operated in the forward direction, and the engine 1 rotates at high speed.

In addition, in FIG. 1, 22 is a foot petal for engine control, and as shown in FIG.
By depressing the foot petal 22, the rotation of the engine can be controlled independently of the operation of the engine control lever 7.

As explained in detail above, the tractor control device according to the present invention has a simple structure, and can simultaneously perform the acceleration, forward and reverse operations of the hydraulic transmission, and the operation of increasing the engine rotation. Tractor running can be smoothly controlled from a stopped state to a high speed state.

In addition, to increase the engine rotation when reversing, all you have to do is operate the engine control lever in the same direction as the hydraulic control lever, which is extremely easy to do at the same time. When operated at the same time, the engine rotates at low speed (idling) when the engine is in neutral, which eliminates wasted engine speed and is economical.

Furthermore, since the engine control lever is configured so that it can be operated forward or backward from the low speed position, the speed will increase, so reverse throttle operation is possible by simply replacing the stopper. Even if there are regulations in the direction, specifications can be easily changed to accommodate them, parts can be standardized, and mass production can be performed, so costs can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a schematic configuration of a control device according to the present invention, Fig. 2 is a detailed view showing the main parts of Fig. 1, Fig. 3 is an exploded perspective view showing the main parts of Fig. 2, and Fig. 4 6 through 6 are explanatory diagrams of the main parts showing the operating state according to the present invention, FIG. 7 is a positional relationship diagram of the lever showing the main parts according to the present invention, and FIG. 8 is a perspective view showing details of the foot petal according to the present invention. It is. 1...Engine, 3...Hydraulic transmission, 6...
...Hydraulic control lever, 7...Engine control lever, 8...Hydraulic control arm, 15...Hydraulic lever arm, 17...Cam plate, 17a...Cam follow, 19...Engine control rod, 20...Engine slot Tutle arm, 22...foot petal.

Claims (1)

[Scope of utility model registration request] The hydraulic transmission control lever and the engine control lever are coaxially arranged side by side, so that the operating range of each of the control levers is the same, and the tips of the grips of the levers are placed close to each other so that they can be operated simultaneously. The neutral point of the hydraulic transmission control lever is set to a low speed, and the engine speed is set to operate at high speed regardless of whether the hydraulic transmission control lever is operated forward or backward, and the engine rotation is operated to the high speed side when the hydraulic transmission control lever is moved forward or backward. A control device for mobile agricultural machinery.