JPH0253001B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmission device for transmitting engine power to a transmission in an agricultural passenger vehicle.

[Conventional technology]

When an agricultural passenger vehicle is driven around, it is necessary to align the rows after turning, so the speed of the vehicle is low, i.e., the engine speed is reduced, which is an inconvenience as the engine horsepower decreases and the engine stalls. It was hot. Furthermore, when turning, either the left or right brake is applied to turn the vehicle, which increases the risk of engine stalling.

[Problem to be solved by the invention]

Therefore, the present invention provides an agricultural passenger vehicle that can reliably rotate at a low speed without stalling by automatically reducing the speed by depressing the brake pedal during rotation without reducing the engine speed. The purpose of the present invention is to provide a transmission device of the type.

[Means to solve the problem]

In order to achieve this object, the transmission device for an agricultural passenger vehicle of the present invention is an agricultural passenger vehicle in which a continuously variable belt transmission mechanism is provided between the output shaft of the engine and the input shaft of the transmission. The stepless belt transmission mechanism is activated by depressing one of the left and right brake pedals, which are operated by depressing the left and right brake pedals when the vehicle is running, and the rotation of the input shaft is reduced to a low speed. It is characterized by being configured as follows.

[Effect]

With the above configuration, even if either the left or the right brake pedal is depressed, the left and right wheels simultaneously slow down and the engine does not stall, allowing stable cornering.

〔Example〕

The present invention will be explained below with reference to an illustrated embodiment.

In FIG. 1, a planting machine 3 is connected to the rear of an agricultural passenger vehicle 1 via a lift mechanism 2 so as to be able to move up and down, and between an output shaft 5 of an engine 4 and an input shaft 8 of a transmission 7. A split pulley 6 mounted on the output shaft 5 of the engine 4 and an input pulley 9 mounted on the input shaft 8 of the transmission 7 are connected by a belt 11 to constitute a continuously variable belt transmission mechanism. An idler 12 is installed on the slack side of the belt 11.
The base of the lever 13, which is attached to the free end of the lever 13, is pivoted to the body 14, and is given a clockwise rotational tendency in the figure by the elasticity of a spring (not shown).

The split pulley 6 is connected to the output shaft 5 as shown in FIG.
It consists of a cone 6a fixed to the output shaft 5, and a cone 6b which is slidable with respect to the output shaft 5 and has the habit of coming into pressure contact with the cone 6a.
By changing the distance between a and 6b, that is, the width of the split pulley 6, the effective diameter that the belt 11 contacts changes. The shifter 1 shown in FIG.
The free end of the shifter 16 is inserted, and the base of the shifter 16 is fixed to the lower end of a shaft 17 (FIG. 1) which is pivotally connected to a stationary member, and the base of a lever 18 is fixed to the upper end. One end of the connecting rod 19 is pivotally attached to the lever 18 , and the other end of the connecting rod 19 is pivotally attached to one end of a rotating member 21 .
The arm portions 23a of the left and right brake pedals 23 are opposed to the abutting plate 21a, which is pivotally connected to the brake pedal 4 and fixed to the other end thereof, with some play.

When turning, when you step on either the left or right brake pedal 23, the arm 23a moves against the backing plate 21.
a, the rotating member 21 rotates counterclockwise in FIG. 2, and in conjunction with this, the shifter 16 rotates clockwise. That is, since the conical body 6b slides toward the engine 4, the width of the split pulley 6 becomes wider, and the effective diameter with which the belt 11 contacts becomes smaller. Therefore, the brake force from the brake pedal 23 acts on the traveling vehicle 1, and the diameter of the split pulley 6 is reduced to automatically change the speed, so the rotation speed of the input shaft 8 is automatically reduced and the vehicle speed is ensured. be dropped. In this case, due to the braking action, even if the rotational speed of the engine 4 decreases and the output horsepower decreases, the transmission ratio for the input pulley 9 is increased and the driving force is automatically reduced so that the driving force increases. There will be no engine stall, and
By adjusting the amount by which the brake pedal 23 is depressed, the reduction ratio between the output shaft 5 and the input shaft 8 can be adjusted.

3 and 4 show another embodiment of the invention, in which one end of a wire 26 is latched to a pedal arm 25 which is pivotally connected to the fuselage 14 by a shaft 24. In FIG. 4, a tension pulley 31 is in pressure contact with the slack side of the belt 11 from the inside, and the base of a tension arm 32 with the pulley 31 mounted on its free end is attached to a stationary member with a shaft 33. The tension arm 32 is pivotally mounted, and the tension arm 32 is given a weak rotational force in the counterclockwise direction by the elasticity of the torsion spring 34. The base of a short arm 35 is fixed to the shaft 33 and is substantially integral with the tension arm 32, and a pin 36 provided at the free end of the short arm 35 has the wire 26 (FIG. 3) fixed thereto. reference)
One end of is locked. By depressing the brake pedal 23 when the vehicle is running,
The wire 26 is pulled and the tension arm 32
Rotate in the direction of arrow 37. Due to this rotation, the tension pulley 31 rotates from the position shown by the solid line to the position shown by the chain line 31A, and as a result, the belt 11 is pushed to the position shown by the chain line 11A.
1 widens the width of the split pulley 6, the diameter of its contact portion becomes smaller, and the input shaft 8 rotates at a lower speed. Therefore, the traveling vehicle 1 is reliably decelerated by the automatic speed change by reducing the diameter of the split pulley 6.

FIG. 5 shows another embodiment of the present invention, in which the outer end of a bell-con piston 41 is pivotally connected to the free end of the short arm 35 by a pin 42, and the inner end of the piston 41 is pivotally connected to the free end of the short arm 35. Slide member 43 receiving
is a bell-con cylinder 4 installed on a stationary member.
4 is loosely fitted. The switching member 46, to which one end of the wire 26 is fixed at its free end, switches the bell-con valve 47 by its rotation.

When the vehicle is running, the brake pedal 23
When is pressed and the wire 26 is pulled, the switching member 46 rotates clockwise, and the bellcon valve 47
The passage is switched from the passage 47a to the passage 47b, and the pressure oil from the pump 48 flows into the bellcon cylinder 44. As a result, the bellcon piston 41 moves in the direction of arrow 51 and the tension pulley 31
As a result of rotating the belt 11 to the position shown by the chain line 31A, the belt 11 becomes the state shown by the chain line 11A, the width of the split pulley 6 increases, the driving force of the split pulley 6 relative to the input pulley 9 increases, and the input shaft 8
The rotational speed of the vehicle 1, that is, the speed of the vehicle 1, is reduced.

〔Effect of the invention〕

As described above, according to the present invention, when the vehicle is running, the stepless belt transmission mechanism is actuated due to the depression of either the left or right brake pedal, which is operated by depressing, and the input shaft Since the engine is configured so that the engine rotates at a low speed, when the vehicle is moving around, the transmission ratio is increased without reducing the engine speed, and the gears are automatically changed to increase the driving force, which prevents the engine from stalling. It is possible to achieve reliable low-speed rotation without any problems. In addition, engine stalling due to the load on the engine due to the braking action during rotation is reliably eliminated by decelerating the vehicle so that the driving force increases.

[Brief explanation of drawings]

Fig. 1 is a side view of a transmission device for a riding rice transplanter showing one embodiment of the present invention, Fig. 2 is a plan view of the same, and Fig. 3 is a schematic side view of a transmission device showing another embodiment of the invention. , FIG. 4 is a side view showing the main parts of the transmission device,
FIG. 5 is a side view of a transmission device showing yet another embodiment of the invention. 1... Travel vehicle, 2... Lift mechanism, 3... Planting work machine, 4... Engine, 5... Output shaft, 6...
Split pulley, 7...Mission, 8...Input shaft,
9...Input pulley, 11...Belt, 12...
Idler, 13... Lever, 14... Airframe, 1
6...Shifter, 17...Shaft, 18...Lever,
19... Connecting rod, 21... Rotating member, 22...
Axis, 23... Brake pedal, 24... Axis, 25
...Pedal arm, 26...Wire, 31...
Tension pulley, 32... Tension arm, 33... Shaft, 34... Torsion spring, 35... Short arm, 36... Pin, 41... Belcon piston,
42... Pin, 43... Slide member, 44...
Belcon cylinder, 46...Switching member, 47...
...Belcon valve, 48...pump.

Claims (1)

[Scope of Claims] 1. In an agricultural passenger vehicle that is provided with a continuously variable belt transmission mechanism between the output shaft of the engine and the input shaft of the transmission, left and right brake pedals are operated by depressing when the vehicle is turning. A transmission device for an agricultural passenger vehicle, wherein the continuously variable belt transmission mechanism is activated by depression of one of the brake pedals, and the rotation of the input shaft is reduced to a low speed. 2. The transmission device for an agricultural passenger vehicle according to claim 1, wherein a split pulley of a continuously variable belt transmission mechanism is operated by a shifter that is linked to brake pedal operation. 3. The agricultural passenger vehicle according to claim 1, characterized in that the belt tension of the continuously variable belt transmission mechanism is changed by a tension pulley interlocked with the brake pedal by a wire to operate the split pulley. Transmission device. 4. Agriculture according to claim 1, characterized in that the split pulley is widened by displacing the tension pulley using a bellcon valve linked to the brake pedal by a wire to change the belt tension of the continuously variable belt transmission mechanism. Transmission device for passenger vehicles.