JPH0357731A - Speed change operation structure for vehicle - Google Patents

Abstract

PURPOSE:To facilitate operation performance by arranging an advance pedal and a retreat pedal in parallel and connecting the both pedals with an accelerating device through an interlocking operation mechanism for operating the accelerating decide to a high speed side. CONSTITUTION:When an advance pedal 25 and a retreat pedal 26 which are arranged in parallel are stepped ON, limit switches 37 and 38 are turned ON, and a pressurized oil feeding valve is switched to an advance side or retreat side, and the advance or retreat drive state is generated. Further, a cam 30 is turned according to the stepping-ON quantity, and an accelerator device 35 is operated to a high speed side through an interlocking operation mechanism 45. Therefore, advance and retreat are carried out only by the stepping-ON operations of the pedals 25 and 26, and the traveling speed can be increased and reduced according to the stepping-ON quantity. Further, in the traveling on a road, traveling is performed by setting an accelerating lever 23 to a prescribed position and lightly stepping ON the advance pedal 25.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gear shift operation structure for a vehicle, and more particularly to a gear shift operation structure for a vehicle that frequently performs forward/reverse switching operations.

[Conventional technology]

For example, in work where the vehicle frequently repeats forward and backward travel, such as replacing earth and sand with a dozer vehicle for earthworks, or transporting straw etc. with an agricultural tractor, switching between forward and backward travel is required. In order to perform the operation, conventionally, for example, as in the agricultural tractor shown in Japanese Utility Model Application Publication No. 1-63582, a single speed change linked to a hydrostatic continuously variable speed installed in the transmission system to the traveling wheels has been used. Provide the pedals on the control section,
There is a known structure in which the more the shift pedal is depressed forward, the more the gear can be shifted forward, and the more the pedal is pushed backward, the more the gear can be shifted backward.

[Problem to be solved by the invention]

In the conventional type mentioned above, which switches forward and backward through a hydrostatic continuously variable transmission, the forward and backward changes are smooth, but the acceleration to the speed increasing side is small, and the forward and backward changes are difficult. Since the speed cannot be increased quickly after the vehicle has reached the high speed, the accelerator lever, which can be operated and held, is set in advance to the high speed side, so that the speed can be increased quickly.

However, in work that frequently involves switching forward and backward as described above, the accelerator lever is set in advance to the high-speed side, so the engine is operated at high speed even when the vehicle is stopped or at low speed, resulting in large engine noise. , and had the disadvantage of low fuel efficiency. In addition, hydrostatic continuously variable transmissions are expensive and have high maintenance costs, so
The drawback was that it was expensive.

The present invention has been made in view of the above-mentioned circumstances, and is intended to simplify the speed increase operation associated with forward/reverse switching without having to constantly operate the engine at high speed in work where frequent forward/reverse switching is required. The purpose of the present invention is to provide an inexpensive vehicle gear shifting operation structure that can be easily and quickly performed.

[Means to solve the problem]

In order to achieve the above object, the vehicle speed change operation structure according to the present invention includes a forward pedal that switches the forward/reverse switching device of the gear transmission case to the forward direction, and a forward pedal that switches the forward/reverse switching device of the gear transmission case to the reverse direction. A reverse pedal to be switched is arranged in parallel, and the forward pedal and reverse pedal are
It is characterized in that it is linked to the accelerator device via an interlocking operation mechanism that operates the accelerator device of the engine at high speed according to the amount of depression in each.

The functions and effects of this characteristic configuration are as follows.

[For production]

According to the above configuration, it is possible to switch between forward and backward travel by depressing the forward or reverse pedal, and the accelerator device is operated to accelerate or decelerate depending on the amount of depressing, and the forward speed or reverse speed is increased or decreased. . When both pedals are in the neutral position, the accelerator also goes into an idling state, and the engine runs quietly at low speed.

〔Effect of the invention〕

Therefore, similar to those using a hydrostatic continuously variable transmission, by simply switching between the forward and reverse pedals,
It is possible to change the vehicle forward and backward, accelerate and decelerate, and has excellent operability, while also achieving low noise and low fuel consumption when stopping in neutral or driving at low speeds. It has the advantage of being cheaper to implement than those that use a transmission.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

A fourth example of an agricultural tractor according to the present invention is a vehicle.
Shown in the figure.

This agricultural tractor has a pair of left and right front wheels (1), (1)
The engine (3) is mounted on the front part of the traveling aircraft (A) equipped with a pair of left and right rear wheels (2), (2), and the control section (5) equipped with the seat (4) is mounted on the traveling aircraft (A). ) from the center to the rear, and at the rear of the traveling machine (A), there is a lift arm (6) that connects a working device such as a rotary tiller so that it can be raised and lowered, and a lift arm (6) that transmits power to the connected working device. It is equipped with a power take-off shaft (7) for this purpose.

Then, as shown in FIG.
) is removably connected to a removable support frame (10) connected to a removable support frame (10), so that excavation and earth removal work can be performed. This packet device (8) includes a hydraulic cylinder (l) that drives the boom (l) to swing up and down around a pivot shaft (12).
3) and a hydraulic cylinder (l6) that swings and drives the packet (15) around the pivot shaft (l6).
7) to the support frame (10).
) so that it can be attached and detached integrally with the boom (11).
It is attached to the boom support frame (20) while being housed inside the valve case (19). And the fifth
As shown in the figure, one lever (21) configured to be able to operate both valves by a cross-swing operation is extended rearward from the valve case (l9), and this lever (2l
) is placed next to the control section (5) so that the operator seated on the seat (4) can operate the lever (20>).

As shown in FIG. 5, an accelerator lever (23) for accelerator setting is provided on the right side of the steering handle (22) in the control section (5), and a brake pedal (
24), a forward pedal (25) and a reverse pedal (26) are provided on each step (27).

As shown in FIGS. 1 and 2, the forward pedal (25) and the reverse pedal (26) are
) arm (25a), (26a) end boss (25
b), (26b) are externally fitted onto a shaft (28) extending in the left-right direction below the step (27), so that the shaft (28) can freely swing vertically around the axis (P1) and has a spring. (2
9), (29), the respective pedals (25), (
26) is configured to return to the upper side,
As a result, the forward pedal (25) and the reverse pedal (25)
6) are arranged side by side on the left and right. Then, as shown in FIGS. 1 and 2, both the bosses (25b
), (26b) butt each other, cams (30), (30) of the same shape are fixedly installed, and when both the pedals (25), (26) are returned, These cams (30), (30) are arranged so that they almost overlap when viewed from the side, and the cam follower (31) is arranged so that the cam follower (31) can come into contact with the cam surface of each of the cams (30), (30). When the forward pedal (25) or the reverse pedal (26) is depressed, the cam follower (31) moves its pivot axis (
The release ear (33) is connected to the free end of the arm (32) that swings integrally with the cam follower (3l).
) is designed to be retracted.

This release wire (33), as shown in FIG.
A rocking piece (
Accelerator operating arm (34) that is operated in contact with 23a)
It is attached to. In Fig. 1, the accelerator device (35) of the engine (3) (specifically, the throttle valve operating arm attached to the engine (3)) increases in speed due to the counterclockwise rocking of the accelerator operating arm (34). The accelerator operating arm (34) and the accelerator device (35) are linked via a rod (44) so as to be operated by a crocodile. The accelerator lever (23), as shown in FIG. In position (1), the rocking piece (23a) and the accelerator operating arm (34) are set to be in a non-contact state, and the accelerator lever (
23> toward the maximum speed (MAX), the rocking piece (23a) presses the accelerator operating arm (34), and the accelerator device (23a) is biased to return to the idling position.
35) can be operated at high speed.

Therefore, when the forward pedal (25) or the reverse pedal (26) is depressed, the cams (30), (3)
0) swings the cam follower (3l), the accelerator operating arm (34) swings in conjunction with this, and the accelerator device (35) is operated at high speed. here,
Cam (30), (30), and cam follower (3l)
, release wire (33), accelerator operating arm (34)
) and the rod (44) constitute an interlocking operation mechanism (45).

On the other hand, as shown in FIGS. 1 and 2, limit switches (37) and (38) are provided for detecting whether or not the forward pedal (25) and the reverse pedal (26) are depressed.
The tips (27) are installed on the lower surface of the tips (27) at positions corresponding to the arms (25a) and (26a) of the forward pedals (25) and reverse pedals (26), respectively.
5), (26) are not depressed, the arms (25) of the respective pedals (25), (26) are in the reset state.
a), (26a) are limit switches (37), (
Press the detection protrusion of 38) to open the limit switch (37).
). The switching state of (38) is in the open state.

When the forward pedal (25>) or the reverse pedal (26) is depressed, the arms (25a), (26a) move away from the limit switches (37), (38), the pressure on the detection protrusion is released, and the limit switch (37),
The switching state of (38) is set to the closed state. In this agricultural tractor, as shown in FIG. 3, power from the engine (3) is input to the gear transmission case (39) via the main clutch, and within the gear transmission case (39), The input power is transferred to the gear type transmission (4l) on the lower transmission side and the rear wheels (2) through one of the friction multi-plate forward hydraulic clutch (40a) or the reverse hydraulic clutch (40b). ). Here, the forward hydraulic clutch (4
0a,) and the reverse hydraulic clutch (40b) constitute a forward/reverse switching device (40). As shown in FIG. 3, the forward hydraulic clutch (40a) and the reverse hydraulic clutch (40b) are
It is connected to the hydraulic pump via a pressure oil supply switching valve (43) that can selectively supply pressure oil to 0a) and (40b), and also supplies pressure oil to the limit switches (37) and (38), respectively. It is electrically linked to each solenoid of the switching valve (43). This configuration allows the forward pedal (
25), the limit switch (37) closes and the pressure oil supply switching valve (43) is operated to the forward side.
Pressure oil is supplied to the forward hydraulic clutch (40a), so it becomes a forward drive state, and when the reverse pedal (26) is depressed, the limit switch (38) closes and the pressure oil supply switching valve (43) is operated to the reverse side. hydraulic clutch for reverse (
40b), the vehicle enters a reverse drive state, and when neither the forward pedal (25) nor the reverse pedal (26) are depressed, the pressure oil supply switching valve (43) returns to the neutral side. There is.

When performing work such as replacing earth and sand in a field with the above-configured agricultural tractor, the traveling machine ( A) The direction of travel can be selected, and the accelerator device (35) of the engine (3) is operated to the high speed side according to the amount of depression in the depression operation, so switching forward and backward and operating the accelerator can be done in one depression. It can be done by operation.

In addition, when driving on the road, etc., the accelerator lever (23
) is set at a predetermined accelerator position, the vehicle can travel in the accelerator state set by the accelerator lever (23) simply by lightly pressing the forward pedal (25).

In the above embodiment, a structure using a cam (30) and a cam follower (31) was shown as the interlocking operation mechanism (45), but the structure is not particularly limited to this.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

4

[Brief explanation of drawings]

The drawings show an embodiment of the speed change operation structure for a vehicle according to the present invention, and FIG. 1 is a schematic side view showing the main parts of the speed change operation structure, FIG. 2 is a plan view showing a forward pedal and a reverse pedal, and FIG. The figure is a schematic diagram showing an operating system for switching forward and backward, FIG. 4 is a side view of the agricultural tractor, and FIG. 5 is a rear view of the control section of the agricultural tractor. (3)...Engine, (25)...Forward pedal, (26)...Reverse pedal, (35)
... Accelerator device, (39) ... Gear transmission case, (40) ... Forward/forward switching device, (45) ... Interlocking operation mechanism.

Claims (1)

[Claims] Forward/forward switching device (4) of gear transmission case (39)
0) to forward direction;
A reverse pedal (26) for switching the forward/reverse switching device (40) to reverse is provided in parallel, and the forward pedal (25) and the reverse pedal (26) are arranged in parallel depending on the amount of depression of each. An interlocking operation mechanism (45) that operates the accelerator device (35) of the engine (3) at high speed according to the request.
A vehicle speed change operation structure linked to the accelerator device (35) through.