JPS6336005B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a power transmission device for work vehicles such as agricultural machinery including rough terrain vehicles and various work vehicles.

[Prior Art and Problems to be Solved by the Invention] Conventionally, in traveling vehicles, a method has generally been adopted in which the traveling speed of the vehicle and the rotational speed of the work equipment are changed using a manual lever that is linked to a belt tension pulley. However, many passenger vehicles are equipped with a transmission with a built-in auxiliary transmission, but this transmission system is large and expensive. On the other hand, there are some passenger vehicles that have adopted a belt tension system, but they are few in number, and even if they are, the power transmission device cannot be disconnected or connected.
As with the traveling type, it is generally operated using only a manual lever, and there is a large difference in the operating feel compared to a car equipped with a foot pedal, making it extremely difficult to operate. There are also known models that are equipped with a foot pedal, but none of these have a configuration that takes into consideration the operability of the driver in relation to the driving control section, and for this reason, it is not possible to use a foot pedal. However, there are still disadvantages in that the operating feel is very different from that of a car, making it difficult to operate and causing many erroneous operations.

[Means for solving the problem] In view of the above-mentioned circumstances, the present invention was created with the aim of providing a power transmission device for a work vehicle that can eliminate these drawbacks. , a plurality of pairs of pulleys of different sizes are provided between the prime mover and the vehicle travel transmission section or the work equipment transmission section, a belt and a tension pulley are provided between each pair of pulleys, and by operating each tension pulley, A single manual lever for selectively operating each tension pulley, and an operating system for the same manual lever, in a system in which the transmission of power to the vehicle travel transmission section or the work equipment transmission section is disconnected or connected to shift and clutch operations, and a single manual lever for selectively operating each of the tension pulleys. The manual lever and the foot pedal are provided with a foot pedal which is interlocked with each other and whose operation interrupts power transmission to all the belts, and the manual lever and the foot pedal are arranged such that the manual lever is located in an upward direction and the foot pedal is located in a downward direction. It is characterized by being biased toward the side opposite to the side where the brake pedal of the driving control section is provided.

With this configuration, the present invention is capable of providing almost the same operating sensation as that of an automobile, even though it is a belt tension type power transmission device.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, 1 is a chassis, 2 is a wheel,
3 is the frame, 4 is the cargo bed, 5 is the panel, 6 is the engine cover, 7 is the driver's seat, 8 is the prime mover, 9 is the transmission, 10 and 11 are the V-belts, 12 is the prime mover side pulley, 13 is the transmission A side pulley, 14 is a brake pedal, 15 is a foot pedal, and 16 is a manual lever. This manual lever 1
6 and forks 17, 18 are connected to a guide plate 20 fixed to the panel 5 by a shaft 19.
(shown by the two-dot chain line in FIG. 3) is rotatably supported. The upper ends of the U-arms 21, 21' are rotatably supported by forks 17, 18, respectively, and one ends of tension springs 22, 23 are hung on the lower ends of the U-arms 21, 21', respectively. Foot pedal 15 and arms 24, 2
5 is rotatably supported by a shaft portion 26' of a bracket 26 fixed to the frame 3, and the arm 2
The tension spring 2 is attached to the ends of the tension springs 4 and 25.
The other ends of 2 and 23 and one ends of Bowden cables 27 and 28 are attached. Bowden cables 27,
The other end of 28 is attached. Also pulley 1
V-belts 10 and 11 are loosely hung between the belts 2 and 13. Furthermore, the guide plate 20 having the manual lever 16 is attached to the driver's seat 7 as shown in FIG.
It is arranged on the left side of a control panel 34 which has a pair of left and right steering levers 33 in front of the control panel 34, and a foot pedal 15 is arranged below it. are arranged in parallel on the left and right with the control panel 34 in between.

In the embodiment of the present invention constructed as described above, the power is supplied by the V-belt 10 that is stretched between the pulley 12 on the prime mover 8 side and the pulley 13 on the transmission side.
or 11 with tension pulley 30 or 30'
By applying tension to the engine, the signal is transmitted from the prime mover 8 to the V-belt 10 or 11 to the transmission 9 to the wheels 2. Now, in the disconnected state shown by the solid line in FIG.
The manual lever 16 is loosened between 3 and 3 and does not transmit power due to slippage, but the manual lever 16 is not connected to the guide plate 20.
When the manual lever 16 is turned ``tangentially'' in the direction of the arrow A along the ``U-shaped'' guide hole, the manual lever 16 will be in the state of ``beyond the consideration point'', and the two-dot chain line will be at the front end of the guide hole of the guide plate 20. It comes to rest in the state shown by .
Further, the manual lever 16 restrains a fork 18 having a "U-shaped" notch, and simultaneously rotates the fork 18, so that the upper end is rotatably supported by the fork 18. The U-arm 21' is pulled up. Therefore, the Bowden cable 2
8 is displaced, and the tension arm 32 attached to the end of the Bowden cable 28 is rotated about the shaft 29 so that the tension pulley 30' is positioned at arrow B shown by the two-dot chain line. As a result, a tension equivalent to the extension of the tension spring 23 is applied to the V-belt 11, thereby tensioning the V-belt 11 and bringing it into a power transmission state.

Next, after operating the manual lever to the disconnected position shown by the solid line in FIG.
When the V-belt 10 is operated in the direction of the arrow C along the guide hole of the V-belt 10, and then rotated "tangentially" in the direction of the arrow A, the other V-belt 10 is tensed by the same action as described above.

On the other hand, a bar 15' is fixed to the clutch pedal 15, and is linked to the operation of the U-arm 21 or 21' and the tension spring 22 or 23 by rotating the manual lever 16 toward the arrow point A.
The clutch pedal 15 is pushed up by the upper surface of the arm 24 or 25 to the position shown by the two-dot chain line in the direction of arrow D. Therefore, the foot pedal 15 can be operated by either one of the arms 24, 25,
Even if the tension springs 22 and 23, which bias the tension pulley 30 or 30' in the belt tensioning direction, resist the belt tensioning force by stepping on the tension springs 22 and 23, which bias the tension pulley 30 or 30' in the belt tensioning direction. As a result, the V-belt 10 or 11 can be released from tension and power transmission can be cut off. Also tension pulley 30,3
0', use manual lever 1 as described above.
It is possible to switch independently by operating only 6, but by further pressing the foot pedal 15, all V
It is also possible to switch by operating the manual lever 16 in a power "off" state where the tension on the belts 10 and 11 is cut off. After switching the manual lever 16, when the foot pedal 15 is released, the manual lever 16 is moved by the action of the stretched tension springs 22 and 23.
Tension pulley 30 or 3 regulated by
0' tensions the V-belt 10 or 11 and puts it in a power transmission state, but at this time, by gradually releasing the pressure on the foot pedal 15, it is possible to prevent the vehicle from suddenly starting.

In this way, according to this embodiment, the foot pedal 1
By operating 5, an inexpensive belt tension type power transmission device can be adopted, and the power transmission can be "disconnected" by pressing the foot pedal 15.
Performed against tension springs 22 and 23,
In addition, the "contact" operation of power transmission by releasing the pressure on the foot pedal 15 is performed by the tension springs 22 and 2.
3, so even though it is a belt tension type, the foot pedal 1
The operation feeling of No. 5 is substantially the same as that of a normal friction clutch by effectively utilizing one type of tension springs 22 and 23.

Moreover, this manual lever 16 and foot pedal 15 are connected to a control panel 3 on which a steering lever 33 is provided.
4, on the left side opposite to the side where the brake pedal 14 is provided, the manual lever 16 is placed upward and the foot pedal 15 is placed downward. The manual lever 16 and the foot pedal 15 will not interfere with the operation of the steering lever 33. During a gear shift operation, while the steering lever 33 is held in a stable position with one hand, the shift operation using the manual lever 16 and the clutch operation using the foot pedal 15 using the other hand are performed using the belt tension system. However, it can be operated reliably with the same operating feeling as that of a regular car, making it extremely easy to operate and eliminating the possibility of erroneous operation.

Next, a second embodiment shown in FIG. 4 will be described. This embodiment is based on the arms 24 and 2 of the first embodiment.
5 is deleted and wires 41 and 42 are added. That is, the Bowden cables 27, 28 and the wire 4 are attached to the lower ends of the tension springs 22, 23.
The other end of 1,42 is the bar 15' of the foot pedal 15.
installed on.

When the manual lever 16 is rotated in the direction A, the Bowden cable 28 is displaced via the fork 18, the U-arm 21', and the tension spring 23, and the tension pulley 30' is actuated. At this time, since the tension spring 23 and the foot pedal 15 are connected by the wire 42, the foot pedal 15 is also pulled up to the arrow D position. On the other hand, Folk 1
Since 7 is stationary, there is a U-arm 21 connected to the bar 15', a tension spring 22, and a wire 4.
1 is free, so no tension is applied to the Bowden cable 27. When the foot pedal 15 is depressed from the D position, even if the manual lever 16 remains in the A position (clutch engaged), the tension applied to the Bowden rope is released, the V-belt 11 is loosened, and power transmission is cut off.
Further, when the manual lever 16 is moved from the arrow point C to the arrow point A, tension is similarly applied to the Bowden cable 27.

This embodiment has the same effects as the first embodiment.

[Operations and Effects] In summary, since the present invention is constructed as described above, it is possible to operate either one of the tension pulleys with a manual lever, and when the other tension pulley is operated using the manual lever. ,
In addition to making it possible to switch independently using the manual lever, the power transmission is cut off by operating the foot pedal, and in that state, after switching the manual lever to the other side, the foot pedal can be used to switch the other tension pulley. It is also possible to operate Furthermore, no matter which tension pulley is activated by the manual lever, the power can be cut off by operating the foot pedal.
contact is possible. Furthermore, the manual lever and foot pedal are arranged on the side opposite to the side where the brake pedal is provided with respect to the driving control section, so that the manual lever is in the upper direction and the foot pedal is in the lower direction. In addition, the lever and foot pedal do not interfere with steering operations or cause people to press the brake pedal mistakenly, and the manual lever and foot pedal for clutch operation are located on the same side. Therefore, when operating the clutch, it is only necessary to arbitrarily select and operate either the manual lever or foot pedal on the same side, and in that case, in a stable position with one hand gripping the steering member. The clutch can be operated quickly and reliably without fear of erroneous operation. In this way, when changing gears, the shift operation using the manual lever and the clutch operation using the foot pedal can be performed reliably and with the same operating feeling as in a regular car, even though they are based on the belt tension system, making them extremely easy to operate. When operating a work vehicle, the belt tension type power transmission device, which is very inexpensive and has a simple structure, can be operated in the same way as in a regular car, and erroneous operation can be prevented. This greatly improves operability.

[Brief explanation of the drawing]

The drawings show an embodiment of the power transmission device for a working vehicle according to the present invention, and show the first embodiment of the power transmission device in the work vehicle according to the present invention.
The figure is a side view of the vehicle of the first embodiment, Figure 2 is a front view of the same vehicle with some of the fittings removed, Figure 3 is a perspective view of the main parts of the same, and Figure 4 is the second embodiment. FIG. In the figure, 8 is the prime mover, 9 is the transmission,
10 and 11 are V belts, 12 and 13 are pulleys, 1
5 is a foot pedal, 16 is a manual lever, 30,3
0' is a tension pulley.

Claims (1)

[Scope of Claims] 1. A plurality of pairs of pulleys of different sizes are provided between the prime mover and the vehicle travel transmission section or the work equipment transmission section, a belt and a tension pulley are provided between each pair of pulleys, and each tension A single manual lever for selectively operating each tension pulley and a single manual lever for selectively operating each of the tension pulleys in a device that operates pulleys to disconnect and connect power transmission from the prime mover to the vehicle travel transmission section or the work equipment transmission section to operate the gear shift and clutch. The manual lever and the foot pedal are equipped with a foot pedal that is linked to the manual lever operation system and that, when operated, cuts off power transmission to all belts. What is claimed is: 1. A power transmission device for a work vehicle, characterized in that the power transmission device is located in an azimuth direction and is biased to a side opposite to a side where a brake pedal of a driving control section is provided. 2. The power transmission device for a work vehicle according to claim 1, wherein the manual lever and the foot pedal are arranged on the left side of a control panel in a driving control section.