JPH04103440A - Working vehicle - Google Patents

Abstract

PURPOSE:To surely prevent unexpected changeover of a shift lever at getting on and off to improve safety by providing a lock mechanism energizated on lock side to enable to obstruct movement of a shift lever to a speed change position, when the shift lever is on the neutral position. CONSTITUTION:The lower end bracket 1a of a shift lever 1 is pivotally supported around the front and rear axis X of a fluctuating member 3 pivotally supported with a fixed pin 2 on a vehicle body side. On both sides of the fluctuating member 3, fluctuating arms 4a, 4b cooperated with a gear shifter are respectively pivotally supported coaxially around a lateral axis of the fluctuating member 3. In this case, when the shift lever 1 is on the neutral position N, a lock mechanism 7 to fix the shift lever 1 is provided. The lock mechanism 7 is provided with a lock claw 7a engaging with a recessed groove 11 provided on the lower end of the fluctuating member 3, and the lock claw 7a is always energizated on the lock side with a string 8. It is cooperated with a main clutch pedal through a cooperative mechanism 9, it is operated to the disengaging side of the lock accompanied with disengaging operation of the main clutch.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to working vehicles for agricultural and construction purposes, and more particularly to a safety device for preventing the body from touching the gear shift lever when getting on or off the vehicle.

[Conventional technology]

Conventionally, no means has been provided to prevent the shift lever from being unintentionally moved to the shift position by touching the body of a driver getting on or off the vehicle.

[Invention or problem to be solved]

Therefore, if the engine was started without realizing that the gear shift lever had been switched to the gear shift position, the aircraft could suddenly start as soon as the main clutch was engaged.

In order to solve this problem, it may be possible to add a means to lock the gear shift lever in the neutral position, but it is expected that people will forget to lock the lever due to the troublesome lock operation. Due to its thinness, it has not been put into practical use.

The present invention has been made with attention to such circumstances, and by rationally configuring the neutral lock mechanism of the gear shift lever, it is possible to eliminate the inconvenience during use (and improve safety). With the goal.

[Means to solve the problem]

The characteristic structure of the present invention for achieving the above object is to provide a locking mechanism that is biased toward the lock side and capable of preventing the shift lever from moving to the shift position when the shift lever is in the neutral position. The locking mechanism and the main clutch pedal are linked via a linking mechanism, and the locking mechanism is forcibly operated to the unlock side against the lock biasing force when the main clutch is in the disengaged state, and when the main clutch is in the engaged state. The structure is such that the biasing operation toward the lock side is allowed, and its functions and effects are as follows.

[For production]

When stopping a running vehicle and getting out of the vehicle, the driver usually returns the gear shift lever to the neutral position before getting out of the vehicle. Therefore, when the vehicle is returned to neutral before exiting the vehicle, the locking mechanism is automatically activated to lock the shift lever, and even if the driver's body touching the shift lever is not changed to the shift position. Also, the next time you get in the car, you will not have to touch the gear shift lever to operate it. Since the main clutch pedal is depressed when starting or when changing gears while driving, the neutral lock of the gear shift lever is released by disengaging the main clutch, so no special unlocking operation is required. <It's fine if you can shift gears as usual.

〔Effect of the invention〕

As described above, according to the present invention, there is no need for any special operation for locking and unlocking the gear shift lever.
This is highly effective in practical use, as it reliably prevents the gear shift lever from being changed unknowingly when getting on and off, thereby increasing safety. In particular, since the lock is released by depressing the main clutch pedal, it is not possible to shift gears if the main clutch pedal is insufficiently depressed, and this has the effect of avoiding gear noise and gear loss caused by shifting operations with the clutch partially engaged. Also plays.

〔Example〕

Embodiments of the present invention will be described below with respect to an agricultural tractor, which is an example of a working vehicle.

As shown in Figure 3, power is transmitted from the main clutch (C) directly connected to the engine (E) to the transmission in the rear transmission case (M) via the transmission shaft (S) to drive the rear wheels (W). At the same time, a connecting hitch (H) for a working device such as a tilling rotary device and a lift arm (R) for raising and lowering are provided at the rear of the mission case (M) to constitute an agricultural tractor.

As shown in Fig. 1, the transmission in the mission case (M') operates in forward 1st speed (F), 2nd speed (F2), and 3rd speed by means of a speed change lever (1) that can be operated in the front and rear as well as in the left and right directions.
It is configured to be able to change speed between speed (F) and reverse (R).

The speed change lever (1) is attached to a swinging member (3) that is swingably supported on a fixing pin (2) on the aircraft body side, and a bracket (1a) at the lower end of the speed change lever (]) or a longitudinal axis ( X) is pivotably supported around the swinging member (3), and is connected to the transmission on both left and right sides of the swinging member (3), concentrically with the horizontal axis (Y) of the swinging member (3). Swing arm (4a), (4b
) are respectively pivotally supported, and a swinging arm (4a) or (
4b), and then, by operating the gear shift lever (1) in the front and rear direction, the selected swing arm (4a) or (4
b) by swinging the swinging arm (4a).
Or (4b), the shift shaft of the transmission is configured to be operable via the linkage mechanism (5a) or (5b).

A locking mechanism (7) is provided that can lock the gear shift lever (1) when the gear shift lever (1) is in the neutral position (N).

The locking mechanism (7) has a recessed groove (1) provided at the lower end of the swinging member (3) as a retaining portion for the locking claw (7a).
1), the lock pawl (7a) is always biased toward the lock side by a spring (8), and the main clutch pedal (10
), and is configured to be operable to release the lock when the main clutch is disengaged by depressing the main clutch pedal (10).

The lock pawl (7a) is designed to be disengaged unless the clutch is completely disengaged. In other words, the length of the wire is set so that the lock will not be released in a half-clutch state. Further, the lock pawl (7a) is located at the shift lever (1), at the shift position (Fl) or (F2),
Furthermore, when in (F,) or (R), the swinging member (
3) It is pressed against the circumferential surface of the lower end, and even if the gear shift lever (1) is operated in the half-clutch state, the lock pawl (7a) will automatically move into the recessed groove (11) when it reaches the neutral position (N). The driver is depressed and cannot move the gear shift lever (1) any further to the gear shift position.

In addition, each gear shift position (F,), (F2), (F3),
(R), the lock claw (7a) may be set so as to go over the circumferential surface of the lower end of the swinging member (3) and engage with the outer edge of the swinging member (3). In this case, The main clutch pedal (10) must be pressed down sufficiently to return the gear shift lever (1) from the gear shift position to the neutral position (N), and the shift lever (1) may shift due to large movements of the vehicle body while driving. The phenomenon of being returned to the neutral position (N) due to inertia,
It is possible to prevent so-called gear slippage.

Further, in order to facilitate comparison with the drawings, reference numerals are written in the claims, and the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the work vehicle according to the present invention, in which FIG. 1 is a perspective view showing the operating structure of the gear shift lever, FIG. 2 is a side view of the same,
FIG. 3 is an overall side view of the work vehicle. (1)...Shift lever, (7)...Lock mechanism, (9)...Linkage mechanism, (10)...
...Main clutch pedal, (N) ...Neutral position.

Claims (1)

[Claims] A lock mechanism (7) capable of preventing the shift lever (1) from moving to the shift position when the shift lever (1) is in the neutral position (N) is provided and biased toward the lock side, and the lock mechanism (7) and the main clutch pedal (10) through a linkage mechanism (
9), the lock mechanism (7) is forcibly operated to the unlock side against the lock biasing force when the main clutch is disengaged, and is operated to the lock side when the main clutch is engaged. A work vehicle configured to allow energized operation.