JPH0324935Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a continuously variable transmission for driving that can freely switch forward and backward, to which a shift pedal is linked, and an actuator for automatic control operation, which is a friction type that allows operation by the shift pedal. This invention relates to a work vehicle that is interlocked and connected via a transmission mechanism.

By providing a friction type transmission mechanism, such a work vehicle can perform a speed change operation using a speed change pedal when the actuator is stopped, or a preferential speed change operation using a speed change pedal when the actuator is under automatic control. However, there was a problem in that it was difficult to accurately stop the vehicle by operating the continuously variable transmission to a neutral state using the speed change pedal.

To explain in more detail, in order to use the gear shift pedal to stop traveling, it is necessary to reliably operate the gear shift pedal to the neutral gear position, but this requires a large operating force against the frictional force of the friction transmission mechanism. It was difficult to quickly and reliably move the gear shift pedal to the neutral position while operating the shift pedal.

For this reason, the present inventor proposed a means for providing a neutral operation pedal for operating the transmission to a neutral gear state in a state in which it is linked to the transmission and in a state in which it is pivoted at a location different from that of the gear shift pedal. However, in this case, although it is possible to stop the vehicle appropriately and quickly by simply depressing the neutral operation pedal, it requires a large-scale linkage structure that links the neutral operation pedal located at a separate location with the transmission. There is a disadvantage in terms of manufacturing, which requires a lot of work, and it is also difficult to operate the neutral operation pedal, which swings around a point far away from the shift pedal, because the feeling of pressing the two pedals is very different. This made it difficult to put it into practical use.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to enable the transmission to be operated in a neutral state appropriately and efficiently by simple modification. It is in the point of doing.

A characteristic configuration of the work vehicle according to the present invention is that a neutral operating pedal for operating the transmission device to a neutral gear state is coaxially supported with the gear shifting pedal, and a state in which the shifting pedal is operated. The functions and effects are as follows.

That is, a dedicated pedal is used to operate the transmission device into a neutral gear shifting state, so that the gear shifting device can be operated into a neutral gear shifting state.

In particular, according to the present invention, by coaxially supporting the gear shift neutral pedal and the gear shift pedal, it is possible to make both gear shift pedals have the same or similar feeling of depression, and the neutral gear pedal can be moved to the same position as the gear shift pedal. The transmission can be operated in a neutral state with a simple structure that effectively utilizes the linkage structure between the transmission and the transmission pedal by linking it to a nearby transmission pedal.

Therefore, it has become possible to operate the transmission device to the neutral gear shift state accurately and quickly with good operability and with a simple structure.

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, a drive case 2 that supports left and right front wheels 1 in a changeable direction, and a drive case 4 that supports left and right rear wheels 3 in a changeable direction, respectively.
A driving unit, which is attached to the main frame 5 and includes an engine E and a radiator 6, is mounted on the front side of the main frame, and a hydraulic continuously variable transmission 7, in which the engine output is transmitted to the shaft, is mounted on the rear side of the main frame. The output of the transmission 7 is transmitted to the front wheel drive case 2 by a shaft transmission mechanism and to the rear wheel drive case 4 by a gear transmission mechanism, and a forked steering handle 8. , and a driver's seat 9 are respectively provided, and a disk-type mower 10 is attached to the lower abdomen of the vehicle body so as to be movable up and down, thereby forming a lawn mowing vehicle.

A front cover C ₁ made of FRP or the like that covers the driving part is placed around the horizontal axis X ₁ on the front end side, and a rear cover C _{2 made of FRP or the like that covers the rear half of the vehicle body is placed around the horizontal axis X 1} on the rear end side. ₂
They are provided around the perimeter so that they can be opened and closed, allowing for easy inspection and maintenance of various devices.

To constitute the driver's seat 9, a seat body made of sponge 9a wrapped with leather 9b is covered with a rear cover _C2.
The driver's seat 9 is provided with a simple structure in which the driver's seat 9 is fitted into the rear cover _C2 and fixed with magic tape or adhesive, and the rear cover _C2 is effectively used as a seat frame. .

As shown in FIG. 2, an interlocking arm 12 that swings integrally with the speed change pedal 11 is interlocked and connected to the swing type speed change arm 7a of the transmission device 7 via a push/pull rod 13, so that the speed change pedal 11 from the neutral shift position N to the forward forward side F, and the more the gear lever is depressed toward the rearward side R, the higher the backward speed.
Then, the electric motor M with a reduction gear serving as an actuator for automatic control operation is connected to the speed change arm 7a.
It is connected to a relay swinging arm 15 which is linked via a push-pull rod 14, using a multi-plate friction transmission mechanism D that allows operation by the pedal 11, so that it can be automatically operated as described later. Although the speed can be changed manually, it is also possible to manually change the speed using the pedal 11.

However, in the figure, reference numeral 16 denotes a swing arm equipped with a roller 18 that engages with a cam plate 17 that swings together with the shift arm 7a in order to maintain the transmission 7 in a neutral state, and is engaged by a spring 19. The mating side is elastically biased.

As shown in FIGS. 2 to 4, a neutral operation pedal 20 for operating the transmission 7 to a neutral speed state is connected to the speed change pedal 11 and the linking arm 12.
In the cylindrical part 22 through which the support shaft 21 that connects the
A cylindrical cam 23 is provided in a state in which the cam 23 is fitted on the outside so as to be able to swing freely, and engages with the pivot boss portion of the gear shift pedal 11 to press the pedal 11 to the gear shift neutral position N.
The neutral operation pedal 20 is spline connected to the cylindrical portion 22 so that it can only slide freely, and a cam protrusion 24 that presses the cylindrical cam 23 toward the speed change pedal 11 is provided on the boss portion of the neutral operation pedal 20.
A cam mechanism K is configured to press the pivot boss portion of the speed change pedal 11 toward the neutral side of the speed change as the pedal oscillates. It is possible to return to the current state.

However, numeral 25 in the figure is a spring that biases the neutral operation pedal 20 back upward.

Next, the automatic control configuration will be explained.

A distance sensor S ₁ is provided to detect the traveling distance of the vehicle body based on the amount of rotation of the ground idle wheel 26, and
A direction sensor S ₂ is installed to detect the orientation of the vehicle body based on geomagnetism, and two tracing sensors S ₃ are installed to detect the boundary between uncut and mowed fields. They are distributed on both sides of the .

To configure the copying sensor _S3 , two inverted U-shaped sensor frames 27 each having a light-receiving element part and a light-emitting element part mounted at a distance in the width direction of the vehicle body are arranged side by side in the width direction of the vehicle body. and located at a height where light reception is blocked by the grass,
Thus, a state in which only one of the two sensor frames 27 on the inside of the vehicle body is shielded from light is determined to be a proper state.

In addition, potentiometers P1 are provided to detect the directions of the front and rear wheels 1 and ₃ separately, and a potentiometer _P2 is provided to detect the shift state of the transmission 7.
A state in which the speed change arm 7a is interlocked with gears is provided.

Then, the detection signals of the sensors S ₁ , S ₂ , S ₃ and the potentiometers P ₁ , P ₂ are manually transmitted to a control device 28 constituted by a microcomputer, and the control device 28 is given commands. In response to the signal, the control valves V ₁ and V 2 of the hydraulic cylinders 1A and 3A, which separately operate the front and rear wheels 1 and ₃ , and the electric motor M are automatically operated to perform reciprocating mowing work as shown in FIG. It is constructed to be able to carry out circular mowing work as shown in FIG.

To be more specific, the work will be carried out while moving along the boundary based on the detection information of the copying sensor _S3 , and if reciprocating mowing work is selected, the forward turning will be performed after one stroke is completed. You will have to make a 180 degree change of direction by making l ₁ and backward turning l _2. Also, if you have selected round mowing work, you will have to make a 90 degree direction change by making a backward turn l ₃ after completing one stroke. will be carried out. In addition, when changing direction, select and use a sharp turn in which the front and rear wheels 1 and 3 each change direction in the opposite direction, or a slow turn in which only the front wheel 1 changes direction, and when entering the work area after changing direction, the front and rear wheels 1 and 3 are directed in the same direction so as to run in a parallel state.

The present invention can be applied not only to lawn mowing vehicles but also to various types of vehicles such as combines.

Further, a support structure for the neutral operation pedal 20, and
The structure for operating the speed change pedal 11 using the pedal 20 can be modified in various ways.

[Brief explanation of drawings]

The drawings show an embodiment of the working vehicle according to the present invention, in which Fig. 1 is a partially cutaway side view of the lawn mowing working vehicle, Fig. 2 is a schematic side view showing the operation configuration of the traveling speed change, and Fig. 3 is the neutral operation. An exploded vertical front view showing the device part of the pedal,
Fig. 4 is a plan view of the cam mechanism, Fig. 5 is a schematic plan view showing the working state, Fig. 6 is a schematic diagram showing the specific configuration of automatic control, and Figs. 7 and 8 each show the running mode. It is a schematic diagram. 7... Continuously variable transmission for traveling, 11... Pedal for speed change, 20... Pedal for neutral operation, D... Friction type transmission mechanism, K... Cam mechanism, M... Actuator.

Claims (1)

[Claims for Utility Model Registration] 1. An actuator M for automatic control operation is connected to a continuously variable transmission device 7 for driving that can freely switch forward and backward to which a speed change pedal 11 is linked.
In this work vehicle, the neutral operating pedal 20 for operating the transmission device 7 to a neutral gear state is coaxial with the gear shifting pedal 11. A work vehicle that is pivoted at a core and is provided in such a manner that the speed change pedal 11 is operated. 2. The utility model according to claim 1, which is provided with a cam mechanism K that presses the pivot boss portion of the shift pedal 11 toward the shift neutral side as the neutral operation pedal 20 swings. work vehicle.