JPH0136706Y2 - - Google Patents

Description

[Detailed description of the invention] This invention places an instrument mounting box in front of the driver's seat, and a manual engine accelerator set lever and a continuously variable transmission operation pedal that is restored to the transmission stop position. A manual control lever for a speed setting mechanism is provided on the right side of the instrument mounting box, and can be used to change the holding position of the operating pedal in the transmission position and release the control pedal. A driving unit of an agricultural tractor configured to change the traveling speed by changing the driving speed, and to be able to travel at a constant speed without maintaining and operating the speed change pedal for work, and to be able to change and set the engine output torque at this time. Regarding the structure of

In the agricultural tractors mentioned above, the instrument mounting box has conventionally been attached to the engine bonnet, and since the engine bonnet is generally made of a thin plate and is prone to slight vibrations, this micro vibration is transmitted to the instrument mounting box, causing the instruments to mount. The tightening screws and wire connectors were becoming loose easily. Also, in order to separate the speed setting mechanism lever from the accelerator set lever to make it easier to avoid accidentally operating one of the operating levers, the speed setting mechanism should be placed in a position corresponding to the crotch of the seated driver. It is placed in the place,
There was a great danger that the lever might be accidentally touched or operated while working, or that one's foot might get caught on the lever when getting on or off the machine.

The purpose of this invention is to make it difficult for minute vibrations to occur in the instrument mounting box, and also to create a simple structure that makes effective use of the structure for this purpose, so that the structure for accelerator setting and speed setting is less likely to cause the wrong lever. The purpose is to enable equipment to be equipped in a state where it is firmly supported.

In order to achieve the objective, the present invention, in the structure of the driving section of the agricultural tractor described above, attaches the instrument mounting box to a column erected on the machine body, and attaches the accelerator set lever to the right side wall of the column. Attachment: The speed setting mechanism operating lever is attached to the left side wall of the support column, and the interlocking shaft of the pedal side member of the speed setting mechanism and the operation pedal are horizontally suspended on the support column.

In other words, by attaching the instrument mounting box to the main body of the aircraft via a strut, engine pot vibrations are not directly transmitted to this box, making it difficult for the instrument mounting box to vibrate slightly.
It is now possible to maintain instruments in a good mounting and connection state over a long period of time without loosening screws or wires.

Furthermore, by installing the accelerator set lever and the speed setting mechanism lever separately on the right side wall and left side wall of the column, and by horizontally suspending the interlocking shaft on the column, both operation levers can be mounted on the column between the levers. Since the two levers are positioned apart from each other, it is difficult to mix them up, and the support can also be used as a supporting member for both operating levers and the interlocking shaft, allowing for interlocking of both levers, the speed setting mechanism, and the pedal. The system can now be securely mounted with a simple structure that does not require special mounting members.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, a driver's seat 1,
In the rear of the wheeled self-propelled body, which has an operating section 3 equipped with a mounting box 2 for instruments such as a speedometer, etc., various working devices such as a rotary tiller can be freely raised and lowered. A lift arm 4 for connection and a power take-off shaft 5 for transmitting power to the connection work device are provided,
It is configured as an agricultural tractor.

The output of the engine 6 is transmitted via the main clutch 7 to a hydraulic continuously variable main transmission 8 that can be switched between forward and reverse in a neutral state, and the output of the main transmission 8 is transmitted to two high and low speed The transmission is transmitted to the front wheels 10 and the rear wheels 11 via the auxiliary transmission 9 which can be switched to the front wheel 10 and the rear wheel 11, and as shown in FIGS. 12, a push/pull rod 13, a swing interlocking tool 14, and a rotating shaft 1
A gear change pedal 16 interlocked via 5 is disposed on the right side of the instrument mounting box 2, and
It is swingably attached via the rotating shaft 15 to a transmission case 17 that forms the main body of the aircraft. Then, as shown in FIG. 6, a bearing 21 is attached to the free end boss portion 18a of the swing support arm 18 extending from the main transmission 8 via an elastic pusher 19 and a support shaft 20. The lower end V-shaped cam surface 12a of the operating member 12 is abutted and biased by a spring 22 to restore the operating member 12 and the pedal 16 to the transmission stop position, and the pedal 16 is used to control the main transmission. 8 to perform forward/reverse switching, travel gear change, and travel stop operations.

Link mechanism 2 to accelerator device 23 of engine 6
As shown in FIG. Case 1
It is attached via a support shaft 27 to the right side wall 26a of a column 26 having a U-shaped cross section, which is erected at 7, so as to be swingable. The lever 25 and the friction plate 2 interposed between the lever 25 and the spindle bracket 28
9 are pressed against the support shaft bracket 28 by the tightening nuts 30, so that the lever 25 operated to any position on the high speed side can be frictionally held so as not to be returned by the self-restoring force of the accelerator device 23 to the idling state. This configuration allows the lever 25 to set the accelerator of the engine 6. On the other hand, as shown in FIGS. 4 and 5, the swing interlocking tool 14 is interlocked via a push/pull rod 31, a swing arm 32, and a rotation interlocking shaft 33 horizontally mounted on the support column 26. Accordingly, a member 34 that is interlocked with the speed change pedal 16 so as to swing integrally therewith is disposed on the left side of the support column 26, and is attached to the support support 26 via the interlocking shaft 33 so as to be able to swing freely. The manual lever 36 of the stopper arm 35 for the pedal side member 34 is swingably attached to the left side wall 26b of the support column 26 via the support shaft 37, and the lever 36 and the support shaft bracket 38 are connected to each other. Friction plate 3 interposed between
9 is pressed against the support shaft bracket 38 by a tightening nut 40, and the stopper arm 35 and the operating lever 36, which have been operated to the operating position, are frictionally held so as not to be returned by the spring 22. This constitutes a speed setting mechanism 41 that holds the speed change operation pedal 16 in the forward transmission position and can freely change and release the holding position. That is, the pedal side member 34 is received and held by the stopper arm 35 to hold the gear change pedal 16 at a desired transmission speed position, and the operating position of the stopper arm 35 is adjusted by swinging the operating lever 36. Shift pedal that should be changed and maintained 1
Furthermore, when the speed position of the pedal 6 is changed and the operating lever 36 is set to the operating position (OFF), the stopper arm 35 is retracted out of the swinging range of the pedal side member 34 and becomes in the deactivated state. There is.

In other words, for work purposes, the vehicle can be driven at a constant speed set by the lever 36 without having to maintain the speed change pedal 16, and the engine output torque at this time can be changed and set by the lever 25. It is set as.

As shown in FIG. 4, a stopper 43 comes into contact with a screw 42 screwed onto the speed change pedal 16 to determine the limit position of the speed change pedal 16 in the reverse direction.
is attached to the support rod 45 for the driving step 44 from which the transmission case 17 is extended so as to be able to swing freely between the action position A and the action release position B. The lever 47 is interlocked so as to be in the operating position A only when the lever 47 is operated to the high speed position H. In other words, in order to check the high speed of reverse movement, and to switch between the activated state and the deactivated state of this restraining structure at once by simply operating the sub-shift, the depression limit position at low speeds is set by screw 4.
Adjustment is made by the screw operation in step 2.

[Brief explanation of the drawing]

The drawings show an embodiment of the structure of the driving section of the agricultural tractor according to the present invention, in which Fig. 1 is an overall side view of the agricultural tractor, Fig. 2 is an overall plan view of the agricultural tractor, and Fig. 3 is an illustration of the continuously variable transmission device. Side view, 4th
The figure is a side view of the continuously variable transmission operating structure, FIG. 5 is a partially cutaway rear view of the operating lever installation section, and FIG. 6 is a sectional view of the bearing mounting section. 1... Driver's seat, 2... Instrument mounting box,
16... Speed change operation pedal, 17... Aircraft body, 2
5... Accelerator set lever, 26... Pillar, 2
6a...Right lateral wall of the column, 26b...Left lateral wall of the column, 33...Interlocking shaft, 34...Pedal side member, 3
6... Speed setting mechanism lever, 41... Speed setting mechanism.

Claims (1)

[Scope of utility model registration request] An instrument mounting box 2 is placed in front of the driver's seat 1, and a manual engine accelerator set lever 2 is installed.
5, and a holding position change for holding the operation pedal 16 in the transmission position by arranging the continuously variable transmission operation pedal 16 restored to the transmission stop position on the right side of the instrument mounting box 2; This is the structure of the driving section of an agricultural tractor which is provided with a manual operation lever 36 of a speed setting mechanism 41 which can be freely released. 25 is attached to the right side wall 26a of the column 26, and the speed setting mechanism operating lever 36 is attached to the left side wall 26b of the column 26, so that the pedal side member 34 of the speed setting mechanism 41 and the operation pedal 16 are interlocked. A structure of a driving section of an agricultural tractor in which a shaft 33 is horizontally suspended on the support 26.