JPH0724624Y2 - Engine start safety device for work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an engine starting safety device for a traveling machine body for work such as a management machine, a tailor, and a tiller.

[Problems to be Solved by the Related Art and Invention] Conventionally, some of the traveling machines for work of this type are provided with a recoil-type starter. Was connected to. For this reason, even if the main clutch remains in the continuous state,
The engine will be started by operating the starter. If the main clutch is started while the main clutch continues, the aircraft may suddenly start running, which poses a problem.

[Means for Solving the Problems] The present invention has been made in view of the above circumstances, and was devised with the object of providing an engine starting safety device for a work vehicle that can eliminate these drawbacks. , In a working traveling vehicle configured to start an engine with a recoil starter, switching is performed based on intermittent switching between an engine drive detection switch and a main clutch, which switches by detecting that the engine is driving. A main safety switch is connected in series to form a starting safety circuit, and the starting safety circuit is connected in parallel with the ignition circuit of the engine, and the starting safety circuit is such that the main clutch is in the continuous state and the main clutch switch is It is set to ON, the engine drive detection switch is set to ON when the engine is stopped, and the main clutch is in the continuous state and the engine is stopped. In this case, the starting safety circuit is closed and the ignition circuit is grounded, and the engine start is regulated. Furthermore, the engine drive detection switch is maintained in the ON state in a low rotation state such as when the engine is started. It is characterized in that it is a centrifugal switch set to.

According to this structure, the present invention is provided with a recoil-type starter, but the engine cannot be started when the main clutch is in a continuous state.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of a management machine, and an engine 2 is mounted on a machine body frame 1a of the traveling machine body 1,
The engine 2 is provided with a recoil-type starter 3 for starting the engine 2. The starter 3 has a centrifugal switch 4 which receives the centrifugal force and switches when the engine 2 is driven, and corresponds to the engine drive detection switch of the present invention which detects the engine drive and switches it to the OFF side. It is decorated as a thing.

By the way, the centrifugal switch 4 is switched to the OFF side when the engine 2 is rotating at least during idling, and is maintained in the ON state at a low rotation speed when the engine is started by the starter 3. Is set against centrifugal force.

On the other hand, 6 is a main clutch switch, and the main clutch switch 6 is set to be ON when the main clutch lever 7 is operated to the entry position and OFF when operated to the cutting position. Moreover, the main clutch switch 6 and the centrifugal switch 4 connected in series are engine stop switches (ignition switches) provided on the operating handle 8 and are always open, and should be operated when desired to stop. Is a switch that is switched to the ON side with)
9 and the engine ignition device 10 are connected so as to be connected in parallel, and the one connected in parallel is grounded on the other side, and the other is connected to the ignition plug 12 via the ignition coil 11. It is connected. Then, the driving of the engine is stopped by turning on the engine stop switch 9 and grounding the circuit, as is conventional.

Further, the main clutch switch 6 and the centrifugal switch 4 are connected in series as follows. In other words, in this switch circuit, the main clutch switch 6 is set to be ON when the main clutch lever 7 is operated to the entry position, and is set to OFF when the main clutch lever 7 is operated to the cutting position, and the centrifugal switch 4 is set to stop the engine. It is set to be ON in the driving state and OFF in the driving state.

When the engine is started, if the main clutch switch 6 is in the OFF state because the clutch is cut off, the circuit of the ignition device 10 will not be grounded, and in this state the recoil rope 3a will be pulled to start the engine. However, since the main clutch is in the on state, when the main clutch switch 6 is in the ON state, the ignition device circuit is grounded and the engine cannot be started. Moreover, in this type, the centrifugal switch 4 is set so as not to be turned off when the engine starts to rotate. Therefore, when the main clutch switch 6 is turned on, the centrifugal switch 4 is turned off by the starter operation. It is configured to prevent the engine from being started by switching to.

Further, the following consideration has been given to this traveling aircraft. In other words, the airframe frame 1a has an engine base 11
The engine 2 is mounted via the engine base 11. The engine base 11 projects toward the starter 3 and can be used as a footrest when starting the engine.

Further, the upper and lower edges of the body frame 1a each have a flange shape and project outward, but the lower flange portion 1b has a plowing blade 12 closest to the body frame 1a of the plowing section 12 attached to the traveling body 1. It enters into the tip of 13 in an overlapping state, thereby preventing soil blocks, gravel stones, etc. scraped up during the plowing work from being caught in the gap between the plowing blade 13 and the frame. Further, it is set that the above-mentioned earth mass and the like bite between the transmission case 15 and the tilling blade 13 to damage them. That is, in this one, a metal fitting 17 having a substantially shape in a rear view is integrally attached to the lower part of the rear hitch 16, and the lower surface of the metal fitting 17 is substantially in contact with the ground surface. Does not intrude, and the soil lump or the like scraped up by this does not intrude between the transmission case 15 and the tilling blade 13.

On the other hand, the fuselage frame 1a has the flange portion 1b as described above.
It is reinforced by forming, but further lower flange part
The reinforcing material 18 is applied to the 1b and integrally fixed to form a further reinforcing structure. Further, in the reinforcement of the machine body frame 1a, it is also possible to attach the reinforcement frame member 19 having a substantially L-shape to the reinforcement.

The fuel tank 20 is arranged above the engine 2 so as to protect the ignition plug 12, but the fuel tank 20 is swingably mounted about a support shaft 20a as a fulcrum, and 2. If the fuel tank 20 gets in the way during inspection and maintenance, etc., attach the fuel tank 20 to the support shaft 20a.
By swinging the fuel tank 20 outwardly, the fuel tank 20 can be positioned so as not to interfere with the work.
In addition, in this case, since the fuel tank 20 is close to the engine 2, it may come into contact with a projecting member such as the spark plug 12 and cannot swing. Therefore, as a countermeasure against such a case, the fuel tank 20 is supported. Boss cylinder 21 with shaft 20a on the machine side
And the pin 20b protruding from the support shaft 20a is mounted on the boss cylinder.
When the fuel tank 20 is fitted into the guide hole 21a formed in the inclined shape in 21 and the fuel tank 20 is swung outward as described above, the pin 20b is guided by the guide hole 21a and moves upward. Therefore, the fuel tank 20 is configured to move upward while moving upward, and accordingly, the fuel tank 20 is designed so as not to come into contact with the spark plug 12 or the like. Incidentally, 22 is an ammunition for urging the support shaft 20a upward.

Further, in this one, the following consideration is given to the rotary clutch 23. In other words, the rotary case (mission case) is provided with the final drive gear 25 in which the power from the engine side has been reduced and the driven gear 27 that is interlocked with the rotary shaft 26. The claw gear 25a is projectingly formed. On the other hand, the gear shaft 28, which rotatably supports the drive gear 25, is regulated to rotate about its axis, but is movable in the direction of the axis so that the clutch tube is movable.
29 is a spline fitting, but this clutch cylinder 29
Further, a claw gear 29a is provided so as to correspond to the claw gear 25a. Further, the clutch cylinder 29 is engaged with a shifter fork 32 which is interlockingly connected to the rotary clutch lever 30 via a wire 31. This shifter fork 32 is a bullet 33
Therefore, the claw gear 29a is constantly urged to the side in which the other claw gear 25a meshes with the other clutch gear 25a, and in this state, when the rotary clutch lever 30 is gripped and operated to pull the wire 31, the shifter fork 32 Is moved against the ammunition 33, whereby the claw gears 25a and 29a are disengaged from each other, and the clutch is disconnected. Since the rotary clutch 23 is formed in the drive gear 25 portion at the final stage after deceleration, it is considered that the work when moving backward in the clutch-cut state can be performed by light load movement.

Further, the left and right fenders 35 are provided in the upper rear part of the traveling body 1, and the rear edge of the fender 35 is formed by a sheet-like rubber elastic material in order to prevent the scattering of the cultivated soil. The upper edge of the hanging member 36 is integrally fixed.

In the embodiment of the present invention constructed as described above, the main clutch switch 6 is ON when the main clutch is in the continuous state when the engine is to be started. Moreover, since the centrifugal switch 4 is also turned on, this circuit becomes a closed circuit, and as a result, the ignition circuit is grounded, so that the engine does not start even if it is attempted to start it. On the other hand, when the main clutch is in the disconnected state, the main clutch switch 6 is in the OFF state, so the safety circuit becomes an open circuit and the engine is started only in this state.

When the engine is driven, the centrifugal switch 4 is turned off and the safety circuit is opened. As a result, the engine does not stop even if the main clutch is in the continuous state.

As described above, according to the present invention, since the engine is not started unless the main clutch is in the disconnected state, there is no problem that the aircraft is inadvertently driven by the engine start, and it is excellent in safety. Become.

Moreover, in this device, since the centrifugal switch is set to maintain the ON state in a low rotation state such as when the engine is started, its reliability is further enhanced and reliability can be improved.

[Effects] In summary, since the present invention is configured as described above, both the switches of the starting safety circuit are turned on when the main clutch is in the continuous state when the engine is started.
Therefore, the ignition device circuit is grounded and the engine cannot be started. Therefore, the engine cannot be started unless the main clutch is turned off and the main clutch switch is turned off. As a result, there is no inconvenience that the aircraft runs unintentionally when the engine is started.

Moreover, since the engine drive detection switch that constitutes this starting safety circuit is composed of a centrifugal switch that is set to maintain the ON state in a low rotation state such as when the engine is started, the When the main clutch switch is switched to the ON state by operating it, etc., the engine start will be stopped, and the centrifugal switch will be switched to the OFF side by the starter operation, and the engine will be started. Can be prevented and the reliability can be further improved.

[Brief description of drawings]

FIG. 1 shows an embodiment of an engine starting safety device for a working vehicle according to the present invention. FIG. 1 is an overall side view of the vehicle, FIG. 2 is a plan view of the same, and FIG. An enlarged side view of the engine section, FIG. 4 is a front view of the engine section, and FIG.
Fig. 6 is an ignition circuit diagram, Fig. 6 is a side view of the main part of the fuselage frame,
FIG. 7 is a rear view of the main part of the same as above, FIG. 8 is a plan view of the engine base, FIG. 9 is a cross-sectional view of the rotary clutch, FIG. 10 is an explanatory view of the action of the rotary clutch, and FIG. A side view, FIG. 12 is an operation explanatory view of the same as above, FIG. 13 is a sectional view of a main part of a body frame portion, FIG. 14 is a side view of a body frame showing another example, and FIG. 15 is a front view of the same. In the figure, 1 is a traveling body, 2 is an engine, 3 is a starter, 4
Is a centrifugal switch, 6 is a main clutch switch, 10 is an engine point or device, 11 is an ignition coil, and 12 is a spark plug.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tsutomu Yamane Tsutomu Yamane 667 Izaiyacho, Higashi Izumo-cho, Yatsuka-gun, Shimane Prefecture 1 Mitsubishi Agricultural Machinery Co., Ltd. (72) Kenji Ito 667 Ojiya-cho, Izumo-cho, Yatsuka-gun, Shimane Prefecture Address 1 Inside Mitsubishi Agricultural Machinery Co., Ltd. (56) References: Actual Development Sho 52-85833 (JP, U) Actual Public Sho 58-34297 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A working traveling machine body having a recoil starter for starting an engine, wherein an engine drive detection switch and a main clutch are intermittently switched by detecting that the engine is being driven. And a main clutch switch which is switched on the basis of the above to form a starting safety circuit, and the starting safety circuit is connected in parallel to the ignition circuit of the engine, and the starting safety circuit is configured such that the main clutch is in a continuous state. Set the clutch switch to be ON, the engine drive detection switch to be ON when the engine is stopped, and when the main clutch is continuous and the engine is stopped, the starting safety circuit is closed and the ignition circuit is grounded. State and configured to regulate engine start,
Furthermore, the engine drive detection switch is a centrifugal switch that is set to maintain an ON state in a low rotation state such as when the engine is started.