JPS6274722A - Working vehicle - Google Patents

Abstract

PURPOSE:To prevent an engine stall due to an accelerator-up manipulation being forgotten during running in a high speed and high loading condition, by associating a link mechanism for a hand accelerator lever with a foot pedal for manipulating a hydraulic stepless speed change gear through a link mechanism. CONSTITUTION:A working vehicle is provided with a speed governor mechanism 1A controlled by a hand accelerator lever 22, for setting the rotational speed of an engine 1 and a hydraulic stepless speed change unit 11 controlled by a foot pedal 24. In the above-mentioend arrangement, a link mechanism A is composed of a rod 20 and a swing link 21, for associating the above- mentioned lever 22 and the speed governor 1A, and the other end of the swing link 21 is coupled to the above-mentioned foot pedal 24 through the intermediary of a link mechanism composed a rod 23 formed therein with an elongated hole 23a. With this arrangement, when the foot pedal 24 is depressed during the low speed manipulation of the speed governor 1A, the latter may be turned into the high speed side irrespective of the hand accelerator lever 22.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a work vehicle such as a tractor, and more specifically, the present invention relates to a work vehicle such as a tractor, and more particularly, the present invention relates to a work vehicle such as a tractor, which is equipped with a speed governor mechanism for setting the rotational speed of an engine, and a hydraulic continuously variable transmission device. The present invention relates to a work vehicle in which the speed regulating mechanism can be operated with a hand accelerator lever at hand, and the hydraulic continuously variable transmission can be operated with a hood pedal.

[Conventional technology]

Conventionally, the hand accelerator lever of the above-mentioned work vehicle is configured to be able to be frictionally held at an arbitrary operating position, and the engine speed and output suitable for the work are determined by setting this operating position.

[Problem that the invention seeks to solve]

For this reason, for example, when moving from driving on flat ground to pitching with the accelerator set set to low output (low rotation), if you forget to operate the engine's accelerator amplifier and try to accelerate by depressing the hood pedal of the transmission, the engine stalls. It had the disadvantage of causing

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks by devising an engine operating mechanism so that the rider does not forget to operate the accelerator of the engine when climbing a hill or the like.

[Failure to solve the problem]

A characteristic configuration of the present invention for achieving the above object is that a hand accelerator lever linkage mechanism and a hood pedal that operates a hydraulic continuously variable transmission are linked via a linkage mechanism, so that when the hood pedal is depressed, The main feature is that the engine speed regulating mechanism is configured to be operated to increase the rotational speed in accordance with the operation.

[For production]

When transitioning from driving on a flat surface to driving on a hill, or when accelerating while driving under a light load, simply depressing the hood pedal in the same way as in a normal car will increase the engine speed.

〔Effect of the invention〕

Therefore, engine stalling due to forgetting to press the accelerator during high-speed, high-load driving is no longer caused.

〔Example] Hereinafter, embodiments of the present invention will be described with respect to a tractor.

As shown in Figure 3, the engine (1), clutch housing (2), transmission case (3), transmission frame (4) connecting the engine (1) and mission case (3), etc. are connected to the main body of the aircraft. A self-propelled vehicle comprising a pair of left and right steerable front wheels (5), (5), a pair of left and right driving rear wheels (6), (6), a driver seat (7), etc. A rotary tiller device (not shown) is installed at the rear of the aircraft.
A lift arm (8) for connecting work devices such as the above so as to be able to be raised and lowered, and a PT for transmitting power to the connected work device.
An O-axis (9) is attached to form a riding agricultural tractor.

Next, the transmission system will be explained. As shown in Figure 2,
Power is transmitted through the engine (1) and the main clutch (10) to a hydraulic continuously variable transmission (H3T) (11) that is capable of switching between forward and reverse directions and serves as a main transmission for the traveling system. Hydraulic clutch type gear auxiliary transmission (12) with two high and low stages via the motor output shaft (114) of (11)
The signal is transmitted to the input shaft (12A) of the rear wheel (6
), (6) are configured to be driven.

On the other hand, the hydraulic continuously variable transmission (11) is connected to the PTo system.
pump output shaft (IIB), PTO transmission (15)
, the power is transmitted to the FTOM<9) via the PTO transmission shaft (16).

The PTO transmission (15) includes a PTO transmission shaft (16)
High-speed transmission is achieved by directly connecting the spline-fitted shift gear (17) to the pump output shaft (IIB) of the hydraulic continuously variable transmission (11), and the gear (X9) fixed to the intermediate shaft (18) ' Low speed transmission is performed by mating.

Next, the connection υJ structure between the engine and the hydraulic continuously variable transmission will be explained.

As shown in FIG.
connected via a swing link (21) of the type 1, and
The swinging link (21) is configured to be operated by a band accelerator lever (22) that can be held by friction.

and the swinging link (21) of the linkage mechanism (A) consisting of the rondo (20) and swinging arm (21) linking the band accelerator lever (22) and the speed regulating mechanism lever (1A). A hood pedal (24) of the hydraulic continuously variable transmission (11) is connected to the other end via a linkage mechanism consisting of a rond (23) with a long hole (23a).

The elongated hole (23a) is for preventing the speed regulating mechanism (1A) from being operated to the low speed side when the hood pedal (24) is operated in reverse, that is, when the vehicle is operated in reverse.

The hydraulic continuously variable transmission (11) changes speed by adjusting the discharge amount of the cylinder pump by changing the angle of the swash plate.
Swash plate support shaft (I1A) that protrudes outside the housing
A cam plate (25) is fixed to the end, and this cam plate (25) is connected to the hood pedal (2) attached to the side of the tractor frame.
4) By connecting the triangular bracket (27) on the side with the rond (26) and depressing the food pedal (24) forward or backward, the forward gear shifting state and the reverse gear shifting state are stepless from the neutral position. It is configured so that it can be obtained.

Therefore, if the food pedal (24) is depressed during low speed operation of the speed regulating mechanism (1A), the hand accelerator lever (
22), the speed regulating mechanism (18) can be operated to the high speed side.

In addition, when the hood pedal (24) is returned, the engine speed returns to the low speed set by the band accelerator lever (22), which prevents the engine speed from increasing unnecessarily during low-speed driving, resulting in poor fuel efficiency. .

[Brief explanation of drawings]

The drawings show an embodiment of the work vehicle according to the present invention, FIG. 1 is a side view showing the interlocking structure between the hand accelerator lever and the hood pedal, FIG. 2 is a schematic diagram showing the transmission structure, and FIG. 3 is a diagram of the tractor. It is a side view showing the whole. (1)...Engine, (1^)...Governing mechanism, (11)...Hydraulic continuously variable transmission, (
22) Hand accelerator lever 1 (24)
...Food pedal (A). (B)... Linkage mechanism.

Claims (1)

[Claims] Speed governor mechanism (1A) that sets the rotation speed of the engine (1)
and a hydraulic continuously variable transmission (11), and the speed regulating mechanism (1A) is connected to a hand accelerator lever (22) at hand.
), and the work vehicle is configured such that the hydraulic continuously variable transmission (11) is operated by a hood pedal (24). A) and the food pedal (24
) through a linkage mechanism (23), and when the hood pedal (24) is depressed, the speed regulating mechanism (
1A) is configured to increase the engine rotational speed.