JPH0263977A - Swing operation structure of work vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a turning operation structure for a working vehicle equipped with a traveling device such as a crawler traveling device that cannot be steered independently.

[Conventional technology]

In a combine harvester equipped with a pair of left and right crawler traveling devices as described above, one of the crawler traveling devices is configured to be able to make a pivot turn (first turning state) by applying braking to one of the crawler traveling devices. If you attempt to make a pivot turn by applying braking to one of the crawler traveling devices while traveling straight at high speed, you will end up making a sharp turn at high speed, which could be dangerous.
In such a state, some vehicles are equipped with a device that automatically reduces the speed of the transmission to a lower speed.

[Problem to be solved by the invention]

In recent years, in addition to turning on grass by applying braking to one crawler traveling device as described above, turning can also be performed by reversing one crawler traveling device to make a super turn (second turning state). Proposals have been made to improve performance.

In this way, a super turn with one traveling device reversed has a much smaller turning radius than a turn with a turn, and a smaller turn can be made, so it is suitable for work vehicles that can make two kinds of turns like this. Even if the vehicle is configured to automatically decelerate when the vehicle makes a pivot turn or a super pivot turn while traveling straight ahead at a set speed or higher, the following situation may occur. In other words, there is no danger even if automatic deceleration is not performed when making a turn at a speed slightly slower than the set speed, but if automatic deceleration is not performed when making a turn at a speed slightly slower than the set speed. The situation is such that it is difficult to say that safety is ensured.

The present invention has been made with attention to the above-mentioned situation, and it is an object of the present invention to provide a structure that allows two types of turns, a pivot turn and a super pivot turn, to be performed safely.

[Means to solve the problem]

The features of the present invention include, in the above-described turning structure of a work vehicle, a vehicle speed sensor that detects the traveling speed of the machine body, a first sensor that detects a switching operation to the first turning state, and a second sensor that detects a switching operation to the first turning state. a second sensor that detects a switching operation to a turning state, and when the first sensor detects a switching operation to a first turning state when the detected speed of the vehicle speed sensor is equal to or higher than a first set speed, a first control means for operating the transmission to a lower speed side; and a first control means for controlling the second turning state when the detected speed of the vehicle speed sensor is equal to or higher than a second set speed which is lower than the first set speed. The second control means operates the transmission for driving to a lower speed side when a switching operation is detected, and its functions and effects are as follows.

[For production]

If configured as described above, the first turn (turn on a turning point) or the second turn (turn on a super turning point) at a vehicle speed equal to or higher than the first set speed.
If you do this, automatic deceleration will occur in both. If the vehicle speed is less than the first set speed but greater than or equal to the second set speed, automatic deceleration is not performed during the first turn, but automatic deceleration is performed when the second turn is performed. In other words, the first set speed and the second
Although vehicle speeds between the set speeds are not particularly dangerous for the first turn, they can still be considered dangerous speeds for the second turn.

If the vehicle speed is less than the second set speed, it is not particularly dangerous to make the first turn or the second turn, so automatic deceleration is not performed.

〔Effect of the invention〕

As described above, by setting the set speed at which automatic deceleration is performed to be different between the first turning state (turning position) and the second turning state (super turning position), safety in the second turning state can be improved. were able to secure it.

Also, if you match the set speed of the first turning state to the set speed of the second turning state so that the speed will be automatically decelerated even if the first turn is made at the second set speed, which is the safe speed for the second turning state. , a situation may occur in which the vehicle speed is unnecessarily decelerated even though the vehicle speed is safe for the first turning state, but the present invention does not allow such a situation to occur.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A combine harvester which is an embodiment of the present invention will be described below based on the drawings.

As shown in Figure 1, the power from the engine (1) is transmitted to the hydrostatic continuously variable transmission (3) via the belt transmission mechanism (2).
The signal is transmitted to the left and right crawler traveling devices (5R) and (5L) via a gear-type transmission mechanism (not shown) in the transmission case (4). The operation part (3a) for changing the swash plate angle of the H3T (3) and the gear shift lever (6) provided in the control part of the aircraft are interlocked and connected via a linkage mechanism (7), and the gear shift lever Gear (8) fixed to the base of (6)
A servo motor (9) is provided for swinging the speed change lever (6) via the servo motor (9).

Inside the mission case (4) are left and right side clutches (IOL) and (IOR) that cut off the power to the left and right crawler traveling devices (5R) and (5L), as well as left and right side clutches (IOC) and (IOR) disconnectors. left and right side brakes (ILL) and (IIR) that apply braking to the crawler traveling devices (5R) and (5L) in the current state, and left and right reversing clutches (12L) that reverse the left and right crawler traveling devices (5R) and (5L). (12R) is provided, and each of the above six sets of mechanisms (IOL)...(12R)
is interlocked with one steering lever (13). In other words, the steering lever (13) can be moved, for example, to the right side clutch (
IOR) When operated to the off position, the right crawler traveling device (5
Power to R) was cut off and the aircraft made a slow turn to the right. When the steering lever (13) is operated to the right side brake (IIR) large position, the right crawler traveling device (5R) is braked and the aircraft turns to the right (first turning state).

When the steering lever (13) is operated to the right reverse clutch (12R) large position, the right crawler traveling device (5R) is reversed and the aircraft makes a sharp turn to the right (second turning state).

And the steering lever (13) is in the neutral position (N).
A limit switch-type neutral sensor (14) detects when the steering lever (13) is operated when the left and right hand brakes (IIL), (IIR) are in the on position. Limit switch-type left and right first sensors (15L) and (15R), as well as left and right reverse clutches (12L) and (12R), limit switch-type sensors that detect when the steering lever (13) is operated to the large position. Second left and right sensor (16L).

(16R) is provided.

Signals from the above sensors (14)...(16R) are input manually to the control device (17), and the aircraft is driven based on the rotational speed of the final gear shift shaft (not shown) in the mission case (4). A signal from a vehicle speed sensor (18) that detects speed is manually input to a control device (17). This control device (17) controls the servo motor (9) based on the above signals.
The vehicle speed is controlled by issuing operation signals to the vehicle.
Next, the flow of control will be explained in detail.

As shown in Figure 2, if the traveling speed (V) of the aircraft detected in step (Sl) is less than the second set speed (V2), the process passes through step (S2) and the traveling speed (V) is maintained. It is. In other words, if the speed is lower than the second set speed (V2), the left and right side brakes (IIL) are activated, (I
IR) or left/right reversal clutch (12L)
), (12R), there is no particular danger even if you do not decelerate.

Then, if the traveling speed (V) is equal to or higher than the second set speed (V2) and lower than the first set speed (Vl), step (S1) is performed.
, (S2), <S3> and moves on to step (S5), when the steering lever (13) is engaged with the left or right reverse clutch (1
2L).

(12R) If it is operated to the large position, step (S6
), the speed of the aircraft is automatically reduced, and the steering lever (13) is switched to the left or right reverse clutch (12L),
(12R) If it is not operated to the large position, the traveling speed (
V) is maintained. In other words, the second set speed (V
2) From the above, there is no particular danger in performing a pivot turn in a speed range below the first set speed (Vl), but it can be considered unsafe to perform a super pivot turn.

When the traveling speed (V) is equal to or higher than the first set speed (Vl), the steering lever (13) passes through steps (Sl), (S2), and (S3), and then moves to steps (S4) and (S5). are left and right side brakes (IIL), (II
R) Large position or left/right reverse clutch (12L), (12
R) If it is operated to the human position, the process moves to step (S6) and the aircraft is automatically decelerated; otherwise, the traveling speed (V) is maintained. In other words, at a high speed higher than the first set speed (Vl), it is considered unsafe to perform either a pivot turn or a super pivot turn, so automatic deceleration is performed.

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.

[Brief explanation of the drawing]

The drawings show an embodiment of the turning operation structure for a working vehicle according to the present invention, and FIG. FIG. 2 is a flowchart showing the flow of vehicle speed control. (3)...Transmission device for driving, (5R), (
5L)... Traveling device, (15R), (15L
)...First sensor (16R), (16L)
...Second sensor, (18)...Vehicle speed sensor, (Vl)...First set speed, (V2
)...Second set speed.

Claims (1)

[Claims] A first turning state in which one of the pair of left and right traveling devices (5R) and (5L) is braked, and the traveling device (5R),
(5L) is a turning operation structure for a working vehicle that can be switched between two states, a second turning state, which is performed by reversing one of the two turning states, and a vehicle speed sensor (18) that detects the traveling speed of the aircraft;
The first sensor (15R), (15L) detects the switching operation to the first turning state, and the second sensor (16R), (16L) detects the switching operation to the second turning state. , when the speed detected by the vehicle speed sensor (18) is equal to or higher than the first set speed (V_1) and the first sensors (15R) and (15L) detect a switching operation to the first turning state, the transmission for driving is activated. (3) a first control means for operating the vehicle speed sensor (18) to a lower speed side; 2 sensors (16R
), and (16L) a second control means for operating a traveling transmission (3) to a lower speed side when detecting a switching operation to a second turning state.