JPH02216330A - Moving working machine - Google Patents

Abstract

PURPOSE:To simplify the operation of travel stopping, etc. by locking a traveling clutch which is operated to a traveling position by a clutch lever in the high idle position of a throttle lever while equally releasing the locking in the low idle position thereof. CONSTITUTION:In a moving operating machine, e.g., in a lawn mower mounting an engine, in order to start a mowing operation, first a throttle lever 5 is drawn near a handle 4 against the tensile force of a spring 10, operating same to a high idle position. Then, by drawing a clutch lever 6 near a traveling position, the hook portion 14a of a rotary arm 14 is engaged with the recessed portion 18b of a rotary cylinder 18. In order to stop the mowing operation, on the other hand, the throttle lever 5 is pulled by a spring 17 and returned to a low idle position. At the same time, the hook portion 14a of the rotary arm 14 is removed from the recessed portion 18a of the rotary cylinder 18 to remove the locking of a traveling clutch, automatically returning the clutch from a traveling position to a stopping position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a mobile working machine such as a lawn mower equipped with an engine.

[Prior art]

A self-propelled lawn mower using an engine as a power source is provided with a throttle operating lever for operating a throttle valve close to a handle portion, and a clutch operating lever for operating a traveling clutch. In addition, the throttle operating lever is generally connected to the throttle valve via a governor mechanism that controls the engine to a constant rotation speed, and has two positions: a high idle position (high rotation when mowing the lawn) and a low rotation (low rotation) position when not mowing the lawn. It is designed to be operated to the idle position.

However, with conventional lawn mowers of this type,
As described in Japanese Patent No. 35515, the throttle operating lever is set to the high idle position, and the clutch operating lever is operated by setting it to the running position or to the stop position.

However, with a lawn mower configured like this, when the clutch control lever is released, the lawn mower will stop, but the engine will still remain in a high idle state, which will generate high engine noise if left unattended. Not only that, but there is also the problem of increased fuel consumption. therefore,
Each time the clutch operation lever is used to stop the vehicle, it is necessary to separately operate the throttle operation lever to the low idle position, which poses a problem in that multiple lever operations become complicated.

[Problem to be solved by the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a mobile working machine that can stop traveling with a simple operation and at the same time put the engine in a low idle state.

[Means to solve the problem]

To achieve the above object, the present invention provides a mobile working machine equipped with an engine, in which a throttle operating lever is operably connected to a throttle valve in a low idle position and a high idle position, and a clutch operating lever is connected to a traveling clutch. is operably connected to a running position and a stop position, and the throttle operating lever is always biased toward a low idle position, and the running clutch operated by the clutch operating lever to the running position can be locked in the high idle position. This feature is characterized in that the lock is released by returning to the low idle position.

The present invention will be explained below with reference to embodiments shown in the figures.

FIG. 5 shows a self-propelled lawn mower according to an embodiment of the present invention.

Reference numeral 1 denotes an engine mounted on the main body of the lawn mower, and a rotary blade 3 for mowing the lawn is attached to a crankshaft 2 protruding downward from the engine. A handle 4 is attached to the rear of the lawn mower body, and a part of the handle 4 near the grip 4a is used to operate a throttle control lever 5 for operating a throttle valve (not shown) and a traveling clutch (not shown). Clutch operation lever 6
, a choke operating lever 7 for operating a choke valve (not shown)
etc. are installed.

FIGS. 1 to 3 are enlarged views of the portion where the operating lever is provided.

A bluff bracket 8 for mounting is welded to the handle 4, two shafts 10.11 are fixed to this bracket 8, and a throttle operating lever 5 and a clutch operating lever 6 are rotatably supported on these shafts 10.11, respectively. has been done.

The throttle operating lever 5 rotates a rotary arm 12, and the rotary arm 12 operates a throttle valve via a governor mechanism (not shown) via a wire 13. The high idle position is when the throttle operating lever 5 is placed close to the handle 4 as shown in Figure 1, which causes the engine to run at high speed without load, and when it is moved away from the handle 4 as shown in Figure 3. When it is in the low idle position, the engine rotates at low speed with no load.

Further, the throttle operating lever 5 has a tension spring 17 stretched between a bracket 5b integrally welded to the bracket 8, and is always placed in the low idle position shown in FIG. 3 by the compressed tension of the spring 17. Forced.

The throttle operating lever 5 is not directly supported on the shaft 10, but is supported via a rotary cylinder 18 that is rotatably supported on the shaft 10. That is, a cocoon-shaped protrusion 18a is formed at the end of the rotary cylinder 18, and this protrusion 18a is fitted into a cocoon-shaped elongated hole 5a formed both on the main body on the throttle operation lever 5 side and on the bluff cage 5b. Supported by

Further, the rotary cylinder 18 and the above-mentioned rotary arm 12 abut each other at a radial contact surface 19, and the rotational torque applied to the rotary cylinder 18 is transmitted to the rotary arm 12 via the contact surface 19. . The rotating arm 12 looks like FIG. 4 when viewed from the front. The rotary tube 18 and the rotary arm 12 are both integrally molded from resin.

A choke operating lever 7 is fixed to the rotary arm 12 (see FIG. 2). The choke valve can be closed by rotating the rotary arm 12 in a direction away from the contact surface 19 (clockwise direction in FIG. 1-3) using the choke operating lever 7.

On the other hand, the clutch operating lever 6 rotates the rotary arm 14 in the counterclockwise direction, and the rotary arm 14 pulls the wire 16 via the tension spring 15.
Turn on the running clutch (not shown). Also, wire 1
When 6 is released, the driving clutch is automatically turned off. That is, the position of the clutch operating lever 6 shown by the solid line in FIG. 1 is the running position, and the position shown by the chain line is the stop position.

This clutch operating lever 6 is biased clockwise in the figure by a torsion spring (not shown). Further, the clutch operation lever 6 and the rotating arm 14 are in contact with each other via the contact surface 20, so that when the clutch operating lever 6 is rotated counterclockwise, the rotating arm 14 is rotated in the same direction. There is. Further, the rotating arm 14 is made of resin, and has a hook portion 14a integrally formed on the side facing the rotating cylinder 18. This hook portion 14a has its tip connected to the rotary cylinder 1.
It can be releasably engaged with a recess 18b provided on the 8 side.

That is, as shown in FIGS. 1 and 2, the throttle operating lever 5
Concave portion 18 of rotating cylinder 18 when in high idle position
b, so that the tip of the hook portion 14a can be engaged with the hook portion 14a. Since the hook portion 14a is made of resin, it itself has appropriate elasticity and can be smoothly engaged and disengaged. Furthermore, when the clutch operating lever 6 is released from the engaged state, the clutch operating lever 6 is automatically returned to the position shown by the chain line by a torsion spring (not shown).

The operation of the lawn mower described above is performed as follows.

First, when the engine is started, the throttle operating lever 5 and the clutch operating lever 6 are in the state shown in FIG. 3 before the lawn mowing operation starts.

Since they are each biased by a spring, the throttle operating lever 5 is in the low idle position and the clutch operating lever 6 is in the stop position.

Next, to start mowing the lawn, the throttle operating lever 5 is pulled toward the handle 4 against the tension of the tension spring 17 to the high idle position, as shown in FIG. 1.2. In this state, next, the clutch operating lever 6
is pulled to the running position against a torsion spring (not shown). As a result of this pulling, the hook portion 14a of the rotary arm 14 engages with the recess 18b of the rotary cylinder 18, so that the traveling clutch is locked in the traveling position. Therefore, in this state, the lawnmower mowing the lawn while running.

Note that when the clutch operating lever 6 is pulled to lock the traveling clutch and then released, the clutch operating lever 6 automatically returns to the original position indicated by the chain line with only the rotating arm 14 remaining.

In order to stop the lawn mowing operation, the user only needs to release the throttle control lever 5, which is used to pull the handle 4. The released throttle control lever 5 is the tension spring 1
7 automatically returns to the low idle position shown in FIG. 3, and the engine rotates at a low speed. At the same time, the throttle operating lever 5 returned to the low idle position.
As shown in FIG. 3, the hook portion 14a of the rotary arm 14 is disengaged from the recess 18b of the rotary cylinder 18, so that the traveling clutch is unlocked and automatically returns from the traveling position to the stop position (off).

As mentioned above, in the lawn mower, the throttle operation lever 5
Just by taking your hand off the wheel, you can stop driving and put the engine into a low idle state. Therefore, engine noise can be reduced and fuel consumption can also be reduced.

In the above-described embodiments, a self-propelled lawn mower was used as an example of a mobile work machine, but the present invention is also applicable to other mobile work machines as long as they use an engine as a power source.

〔Effect of the invention〕

As described above, the mobile work machine of the present invention connects the throttle operation lever to the throttle valve so that it can be operated between the low idle position and the high idle position, and operates the travel clutch to move the bar between the travel position and the stop position. The throttle operating lever is operably connected to the clutch operating lever, and the throttle operating lever is always biased toward the low idle position, and the traveling clutch operated to the traveling position by the clutch operating lever is lockable in the high idle position, and the traveling clutch is moved to the low idle position. Since the lock is released when the throttle lever returns, the vehicle can be stopped and the engine can be brought to a low idle state with the simple operation of letting go of the throttle control lever.

(Margins below this page)

[Brief explanation of the drawing]

Fig. 1 is a side view of the handle portion of a lawn mower according to an embodiment of the present invention when the throttle operating lever is in the high idle position, Fig. 2 is a view in the direction of the ■ arrow in Fig. 1, and Fig. 3 4 is a side view of the same handle when the thrower operation lever is in the low idle position, FIG. It is a schematic side view of the said lawn mower. 1... Engine, 4... Handle, 5... Throttle operating lever, 6... Clutch operating lever 1214
...Rotating arm, 14a...Hook part, 13°16
...Wire 1, 15.17...Tension spring,
18... Rotating cylinder, 18b... Recessed part.

Claims (1)

[Claims] In a mobile work machine equipped with an engine, a throttle operating lever can be connected to the throttle valve so that it can be operated between a low idle position and a high idle position, and a clutch operating lever can be operated to a traveling clutch between a running position and a stop position. The throttle control lever is connected to the drive clutch so that the throttle operating lever is always biased toward the low idle position, and the drive clutch operated to the drive position by the clutch operating lever is locked in the high idle position, and is locked upon return to the low idle position. A mobile work machine configured to be released.