JPH0986222A - Engine emergency stop device for working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stop an engine in an instant by constituting in such a way that a throttle lever is shifted into an engine stop position and a brake is operated in a braking state when an emergency stop lever is shifted into an emergency stop position. SOLUTION: When a throttle lever 15 is shifted in a highest speed position H in the state of an emergency stop lever 21 being in a normal position O, an arm body 22 is brought into contact with or positioned close to the throttle lever 15 side of an operating arm 23 connected to the emergency stop lever 21. When the emergency stop lever 21 is moved into an emergency stop position S from the normal position O, the throttle lever 15 is moved into an engine stop position by the engaged movement of the operating arm 23 and arm body 22. That is, the throttle lever 15 is shifted into the engine stop position by the movement of the emergency stop lever 21 into the emergency stop position S, and braking force is applied to a flywheel 9 by a brake 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency stop device for a diesel engine mounted on a work vehicle such as a walking tractor.

[0002]

2. Description of the Related Art When a work vehicle such as a walk-behind tractor is driven to run, an unexpected obstacle, a fall of the worker, or an abnormality in the working unit must be stopped urgently. For example, it may cause a danger to workers or damage the working machine. Therefore, many work vehicles of this type are provided with a device for urgently stopping the engine, which is a drive source in an emergency, to avoid an accident.

The engine emergency stop device is implemented even when the installed engine is a water-cooled horizontal diesel engine, but the conventional one is an emergency system that is held together with the grip portion of the steering wheel during operation. When the stop lever is released, the emergency stop lever operates the speed governor to the fuel cut position to stop the engine (see, for example, JP-A-58-199227).

[0004]

However, in a water-cooled horizontal diesel engine, since the flywheel has a large rotational inertia, the engine does not stop immediately even if the fuel is cut as in the conventional one, and an emergency stop occurs. There were some unsatisfactory points as a device. Therefore, an object of the present invention is to provide an engine emergency stop device for a work vehicle capable of instantaneously stopping the engine even in a water-cooled horizontal diesel engine having a large rotary inertia of the flywheel. It was carried out.

[0005]

That is, an engine emergency stop device for a work vehicle according to the present invention is a position for cutting off fuel supply to a diesel engine (2) mounted on a vehicle body frame and stopping the engine. In a work vehicle having a handle (5) provided with a throttle lever (15) capable of shifting to an emergency stop lever (21) near the throttle lever (15) of the handle, the emergency stop lever (21) is provided. −
An operating arm (23) for connecting the throttle lever (15) to the engine stop position is connected to (21), and
A brake operation cable (25) connects the emergency stop lever (21) and the brake (27) that applies a braking force to the engine (2) so that the emergency stop lever (21) is in an emergency state. When it is moved to the stop position (S), the throttle lever (15) is moved to the engine stop position and the brake (27) is operated in the braking state.

[0006]

In the work vehicle equipped with the engine emergency stop device as described above, when the emergency stop lever (21) is moved to the emergency stop position (S) while the work vehicle is traveling. As a result, the throttle lever (15) is automatically returned to the engine stop position, and at the same time the brake is released.
(27) is operated in the braking state. Therefore, even after the throttle lever (15) is returned to the engine stop position, the rotational inertia of the flywheel causes the engine that is likely to continue to turn to be instantaneously stopped by the braking force of the brake (27).

[0007]

The engine emergency stop system for a work vehicle according to the present invention is constructed as described above, and the engine is instantaneously stopped by the independent operation of the emergency stop lever. It will be further improved compared to the one. Then, the engine is momentarily stopped when the main clutch is in the connected state, and the transmission system is kept in the connected state even after that, and the braking force is applied by the brake, which causes the parking brake after the work vehicle is stopped. By fulfilling its role, it became even safer.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a side view of a work vehicle (walking tractor) in which the device of the present invention is implemented, and FIG. 2 is a view of the work vehicle. A plan view of a main part of the handle, FIG. 3 is a side view taken along the line AA of FIG.
FIG. 4 is a partial view showing the stopper structure.

In FIG. 1, a walk-behind tractor (T) has a water-cooled horizontal diesel engine (2) mounted on a vehicle body frame extending from a mission case (1), and the same engine (2).
The output shaft of the transmission and the input shaft of the transmission case (1) are interlocked by the transmission mechanism (3) with a main clutch and input to the traveling transmission mechanism in the transmission case (1) to drive the vehicle. Traveling wheels (4) (4) fitted to the left and right axles, which are the output shafts of the transmission mechanism
It is configured to be able to drive forward and backward by driving.

A steering wheel (5) extending rearward from the mission case (1) is used for driving operation, and a hitch (6) provided at the rear portion of the rear of the mission case (1). A work machine (7) such as a rotary tiller is detachably mounted so that the work machine (7) can be operated by a work machine drive mechanism (8) interlocking with the PTO shaft of the mission case. It is configured. In the figure, (9) is a flywheel of the engine, (10) is a shift lever of the traveling transmission mechanism, and (11) is a shift lever of the working machine.

The handle (5) is formed as a square handle or a loop-shaped handle having a wide operation range, but the handle shown in the figure is a pair of left and right handle rods (5a) (5b).
Is formed into a square handle. The side clutch levers (12) and (12) are respectively installed under the grip portions (5c) and (5c) of the handle bars (5a) and (5b) so that they can be gripped and operated, and one of the handlebars can be operated. On the rod (5a),
A main clutch lever device (13) for connecting and disconnecting the main clutch of the transmission mechanism (3) is provided.

The other handle rod (5b) has an operating cord.
A throttle lever (15) interlockingly connected to the speed governing device of the engine (2) via (14) is provided so as to be able to rotate in the front-rear direction about the pivot (16). It is possible to shift from the highest speed position (H) shown to the engine stop position where the fuel injection is stopped beyond the idling position (L). And the throttle lever (15)
Can be maintained at an arbitrary transition position by a ball-like locking mechanism (18) provided between the sliding plate (17).

In the handle (5) having the above-mentioned structure, the handle rod (5b) near the throttle lever (15) and the other handle rod (5a) facing the handle rod (5b).
The lever support shafts (19) and (19) are concentrically mounted on the and, and the lever support shafts (19) and (19) are provided with cylindrical bodies (20) at left and right leg ends.
(20) is freely rotatably fitted and a loop-shaped emergency stop lever
(21) is provided so as to be rotatable back and forth.

The cylinder body (19) located on the throttle lever (15) side is provided with an actuating arm which abuts on the lower side of the arm body (22) connected to the throttle lever (15). Mu
(23) is provided. Further, an operation cord connecting arm (24) is provided on either the tubular body (20) located on the handle rod (5b) side or the tubular body (20) located on the handle rod (5a) side. The blur connected to the rope connection arm (24)
The tip of the operation cord (25) is broken through the spring (26).
The brake (27) is connected to (27) so that it can come into contact with and separate from the flywheel (9) of the engine.

The brake plate (27) is an emergency stop lever.
(21) is in normal position by spring (26) (O position in Fig. 3)
4, the flywheel (9) is maintained in a posture in which the braking force is not applied to the flywheel (9) when the stopper (28) is retained as shown in FIG. 4, and the emergency stop lever (21) is in the stop position ( When the shift operation is performed to the S position in FIG. 3), the brake operation cord is
It is adapted to change the posture so that braking force is applied to the flywheel (9) by the engagement of (25).

Therefore, when the emergency stop lever (21) is in the normal position (O), the throttle lever (15) is
Is moved to the fastest position (H), the emergency stop lever (21)
Throttle lever to the operating arm (23)
When the arm (22) on the (15) side abuts or approaches, and the emergency stop lever (21) moves from the normal position (O) to the emergency stop position (S), the operation arm (23) is activated. The throttle lever (15) is moved to the engine stop position by the engagement movement of the arm (22). That is, the throttle lever (15) is moved to the engine stop position by moving the emergency stop lever (21) to the emergency stop position (S), and the brake (27) is also moved.
Therefore, braking force is applied to the flywheel (9).

The brake (27) is not limited to the one that directly applies the braking force to the flywheel (9) of the engine, and may be, for example, an appropriate rotating wheel or transmission case of the transmission mechanism (3). The braking force may be applied to an appropriate portion of the traveling power transmission mechanism in the space to indirectly increase the load on the engine to accelerate the stop of the engine.

[Brief description of drawings]

FIG. 1 is a side view of a walk-behind tractor in which the device of the present invention is implemented.

FIG. 2 is a plan view of a main part of a handle of a walk-behind tractor.

FIG. 3 is a side view taken along the line AA of FIG.

FIG. 4 is a partial view showing a stopper structure.

[Explanation of symbols]

 S Emergency stop position 2 Diesel engine 5 Handle 15 Throttle lever 21 Emergency stop lever 23 Actuating arm 25 Brake operation cable 27 Brake

Claims (1)

[Claims] 1. A handle (5) is provided with a throttle lever (15) capable of cutting off fuel supply to a diesel engine (2) mounted on a vehicle body frame and shifting to a position where the engine is stopped. In the work vehicle provided, the handle
An emergency stop lever (21) is provided in the vicinity of the throttle lever (15) of (5), and the emergency stop lever (21) is provided with an operation lever capable of moving the throttle lever (15) to an engine stop position. -The emergency stop lever is installed together with the
A brake for applying a braking force to the engine (21) and the engine (2).
When the brake lever (25) is connected to the brake lever (25) and the emergency stop lever (21) is moved to the emergency stop position (S), the throttle lever (15) is moved to the engine stop position. Transition
In addition, an engine emergency stop device for a work vehicle that operates the brake (27) in a braking state.