JPS6031925Y2 - Tiller running device - Google Patents

Description

[Detailed description of the invention] Conventionally, a transmission case equipped with an axle is connected to the output shaft of a transmission case so as to be able to swing back and forth, and the transmission case is connected to the output shaft using a double-acting hydraulic cylinder with the axle serving as a swinging fulcrum. A tiller is already known that swings from the front to the rear so that more weight is applied to the tiller section at the rear during wear-and-tear operations, and the weight at the rear is reduced when the machine turns.

However, since the axle of the tiller moves forward and backward of the output shaft, it is necessary to install a double-acting hydraulic cylinder, which makes the hydraulic cylinder, piping, valves, etc. complicated and increases the cost. After lifting and turning the aircraft, and just before lowering the handle, activate the valve so that the transmission case swings back and forth. If the wheels are in the ground, the reaction force will cause the aircraft to momentarily swing. It was extremely dangerous because it was turned counterclockwise.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, and the transmission case is attached to the output shaft of the transmission case so that it can swing back and forth. In the power tiller, the center of gravity of the machine body can be adjusted back and forth by moving the machine. A single-acting hydraulic cylinder is installed that pushes the transmission case rearward only within the range where the axle is in front of the output shaft even when the axle is tilted to the side, and the operating lever of the single-acting hydraulic cylinder is provided in the control section, and the operating lever The invention is characterized in that a biasing body is attached to return the vehicle to the neutral position.

The embodiment shown in the drawings will be described below. Reference numeral 1 denotes a transmission case. A frame 3 on which an engine 2 is mounted is provided at the front part of the transmission case 1, and a handle 4 and a tilling part 5 are attached to the rear part. be.

6 is a transmission case equipped with axles 8, 8 having wheels 7, 7; A single-acting hydraulic cylinder 10 is interposed between the lower part of the transmission case 6 and swings the transmission case 6 rearward.

Then, the single-acting hydraulic cylinder 10 lifts the bundle 4 to rotate the machine from the state shown in FIG. 1 in which the transmission case 6 is tilted forward so that the weight of the machine is largely shared by the tiller 5 during the tilling operation. Even in this state, as shown in FIG. 3, the axle 8 is configured so that it can only be pushed out to a position that is one point ahead of the output shaft 9, which is the center of rocking.
A hydraulic valve 12 inserted into a hydraulic circuit leading from a hydraulic pump 11 to the single-acting hydraulic cylinder 10 is connected to a horizontal rod 17 fixed to an operating lever 14 via a rod 13, and the base of the operating lever 14 is attached to a bundle. Both ends of a coiled spring 18 attached to the fulcrum rod 16 are loosely fitted into a fulcrum rod 16 which is protruded from a guide plate 15 integral with the guide plate 15, and both ends of the coiled spring 18 are provided to protrude from the guide plate 15 to maintain the neutral position of the operating lever 14. A regulating stopper 19 and the horizontal rod 17 are held in between.

Further, a clamp 20 fixed to the guide plate 15 is provided above the horizontal rod 17, and a T-shaped guide groove 21 is bored on the upper surface of the guide plate 15. 21
When the operating lever 14 inserted through the holder is tilted back and forth, the hydraulic valve 12 is switched, and when the operating lever 14 is tilted laterally at the neutral position, the branch groove in the middle of the guide groove 21 and the clamp 20 are connected to the sixth to eighth positions.
As shown in the figure, since they are aligned when viewed from above, the operating lever 14 is locked by the clamp 20, and even if the operating lever 14 is released at any position in the longitudinal direction of the guide groove 21, the operating lever 14 has a winding spring. 18 automatically returns to the neutral position.

22 is a tension spring stretched between the horizontal rod 17 and the fulcrum rod 16.

In the above-mentioned device, FIG. 1 shows a state in which the machine is moving straight to perform plowing work, and when the machine is to rotate, when the control lever 14 in the neutral position is pulled rearward, the single-acting hydraulic cylinder 10 moves into the transmission case 6. When the transmission case 6 and the axle are pushed rearward, the axle 8 does not move rearward from the output shaft 9 even when the bundle 4 is lifted up to its maximum as shown in FIG.

Further, when the operation of moving the center of gravity of the machine rearward with respect to the wheels 7 is completed and the operator releases the operating lever 14, the operating lever 14 automatically returns to the neutral position.

When starting plowing work after the machine has completed its rotation, press control lever 1.
4 is tilted forward, the single-acting hydraulic cylinder 10 is pushed in by the weight of the machine and returns to the state shown in FIG.

In this case, when the actuating bundle is released, it is returned to the neutral position by the winding spring 18.

In addition, when the tillage work is not performed, when the operating lever 14 is pushed into the horizontal groove of the guide groove 21, the clamp 2 made of a strong elastic plate is activated.
0 locks the operating lever 14 in the neutral position.

In this invention, the transmission case with the axle attached at the bottom is attached to the output shaft of the mission case so that it can swing back and forth, and by swinging the transmission case, the center of gravity of the aircraft is adjusted back and forth. In such a power tiller, the transmission case is made to protrude forward from the output shaft, and between the transmission case and the frame in front of the transmission case, the axle is positioned in front of the output shaft even when the machine body is tilted forward. A single-acting hydraulic cylinder that pushes the transmission case backward only within a certain range is installed, an operating lever for the single-acting hydraulic cylinder is provided in the control section, and a biasing body is attached to the operating lever to return it to the neutral position. When the aircraft is moved forward relative to the wheels to make it easier to lift the bundle 4 when the aircraft is moving around, the axle is located in front of the output shaft of the mission case, which is the swinging fulcrum of the transmission case 6, and the aircraft is moved by the reaction force. It is extremely safe as it will not be swung forward momentarily.

Additionally, as mentioned above, the wheels do not move backward from the output shaft, which is the fulcrum of the transmission case, so it is possible to use a single-acting hydraulic cylinder, which is cheaper in itself than a double-acting hydraulic cylinder. The piping, valves, etc. are simple, which can significantly reduce costs, and when the machine is to be rotated during work or when traveling on the road, the control lever can be operated with one touch at the control section. As a result, the transmission case is restricted by the hydraulic cylinder to just before the output shaft of the transmission case and rotates backwards, and the center of gravity of the aircraft moves forward and at the same time the aircraft rises to almost its limit, increasing efficiency with simple operation. The aircraft can successfully start turning around and traveling on the road.

Furthermore, the control lever returns to the neutral position simply by releasing your hand.
Single-acting hydraulic cylinders can be operated very easily.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view, Fig. 2 is a front view of the main parts, Fig. 3 is a side view with the bundle lifted up, and Fig. 4 is a hydraulic circuit. Figure 5 is a plan view of the operating section, Figure 6a is a rear view of the operating lever mounting section,
b is a side view of the same, FIG. 7 is a plan view of the same, and FIG. 8 is a perspective view of the same. 1...Mission case, 3...Frame, 6...Transmission case, 7...Wheel, End...Axle, 9... ...Output shaft, 10...
... Single acting hydraulic cylinder, 14... Operation lever, 18... Winding spring, 20...
・Hammer.

Claims (1)

[Scope of utility model registration request] A transmission case with an axle attached to the lower part is attached to the output shaft of the transmission case so as to be swingable back and forth, and by swinging the transmission case, the center of gravity of the aircraft is adjusted back and forth, The transmission case is made to protrude forward from the output shaft, and the transmission case is placed between the transmission case and the frame in front of the output shaft only within the range where the axle is in front of the output shaft even when the aircraft is tilted forward. A power tiller is equipped with a single-acting hydraulic cylinder that pushes the rearward direction, an operating lever for the single-acting hydraulic cylinder is provided in a control section, and a biasing body is attached to the operating lever to return the operating lever to a neutral position. Device.