JPH0649904Y2 - Starter device for general-purpose engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention mainly relates to an improvement of a starter device for a portable general-purpose engine equipped with a fan working machine fan such as a chemical spraying machine.

(Problems to be Solved by Conventional Techniques and Inventions) As a starter device for a small-sized general-purpose engine, a manual recoil starter for starting an engine by pulling a rope is generally adopted. However, since the manual starter requires a considerable amount of force to pull the rope, for example, in the case of a backpack-type working machine configured to start the engine by pulling the rope while carrying the edging portion, Actually, it is difficult to start the engine while carrying it on the back, and for this reason, the engine portion is often borne on the engine after it has been started, especially in the case where the engine is frequently repeatedly started and stopped, You have to take down the engine part from your back and re-carry it,
It was very inconvenient.

Further, conventionally, there is known a starter device in which an electric starter is installed together with a recoil starter, and both starters can be appropriately used, but in the case of this starter device, both starters are separately arranged and a crankshaft is installed. A rotation (starting torque) transmission gear mechanism is required for each starter, which complicates the structure, enlarges the entire engine, and considerably increases the cost. As prior art,
There are actual development Sho 60-28272 and actual public Sho 63-298577.

The present invention has been made in view of the above point, and in forming the rotation transmission path from the electric starter to the crankshaft, an existing work machine fan is used and an engaged means is attached to the peripheral portion of the attachment portion. Thus, it is an object of the present invention to provide a starter device that simplifies the structure and can attach an electric starter to a general-purpose engine at low cost.

(Means for Solving the Problems) A starter device for a general-purpose engine according to the present invention is a starter device for a general-purpose engine that has a recoil starter and an electric starter, and has a working machine fan at a protruding portion of one end of a crankshaft, The recoil starter is provided on the side of the other end of the crankshaft on the side opposite to the working machine fan, and the working machine fan attached to the crankshaft is provided with a convex engagement member for starting. In the vicinity of the machine fan, an electric starter whose rotation axis is arranged in parallel with the crankshaft is attached, and when a rotation from the electric starter is transmitted, a driven gear that rotates coaxially with the crankshaft is provided. As the driven gear rotates, it projects outward due to centrifugal force and is engaged by the starting means. It is characterized in that an engaging means for engaging with is provided on the driven gear so that the driven gear can be started.

(Operation) According to the starter device for a general-purpose engine of the present invention, when the electric starter rotates, the driven gear rotates,
With the rotation of the driven gear, the engaging means projects outward due to centrifugal force and engages with the engaged means of the working machine fan, and the engagement between them is performed, and the rotation from the electric starter is applied to the crankshaft. When transmitted, the engine can be started. Further, when the engine is manually started using the recoil starter, the engaging means provided on the electric starter side does not project, so that the electric starter side and the working machine fan side (between the electric starter and the crankshaft) are not connected. In the disengaged state, the recoil starter can be started without receiving unnecessary load on the electric starter side.

Therefore, even when starting with either the electric starter or the recoil starter, only the engagement between either of them and the crankshaft is performed, and the engine can be started by either starter without the unnecessary load of the other starter acting. Can be started.

Embodiment An embodiment of the starter device according to the present invention will be described below with reference to the drawings.

First, the first embodiment will be described. FIG. 1 is a side view of a general-purpose engine with a partial cross section, and FIG. 2 is II of FIG.
FIG. 3 is a partially enlarged view showing the engaged means and the engaging mechanism of the engaging means as seen from the arrow, and FIG. FIG.

In FIG. 1, A is an electric starter, B is a recoil starter, C is a working machine fan, D is a crankshaft, E is a connecting rod, F is a piston, G is a cylinder, and H is integrally formed below the cylinder. It is a crank case.

In the working machine fan C, the attachment portion 1 is fixed to one end portion (left end in FIG. 1) of the crankshaft D of the engine, and the side surface 1a of the working machine fan C on the engine body side. A stopper 2 (see FIG. 2) in the shape of a square rod, which is an engaged means for starting, is projectingly provided on this.

A driven gear 4 is provided in parallel on the engine body side of the working machine fan C on the crankshaft D so as to be rotatable with respect to the shaft D via a bearing 3. At a position corresponding to the stopper 2 of the driven gear 4, a ratchet 5 (see FIG. 2) whose end is movable outwardly around the shaft 5a is arranged to face the stopper 2 in the radial direction. It is attached.

The electric starter A is arranged so that its rotary shaft 6 is parallel to the crankshaft D, and the pinion gear 12 attached to the rotary shaft 6 meshes with the driven gear 4.

On the other hand, the engagement mechanism between the recoil starter B side and the crankshaft D side is also configured in the same manner as in the case of the electric starter A (see FIG. 2). That is, at the other end (right side in FIG. 1) of the crankshaft D,
The magnet wheel 7 is fixedly attached, and a rod-shaped stopper 8 is projectingly provided on the outer end surface 7a.

Then, at a position corresponding to the stopper 8 of the magnet wheel 7 of the recoil reel 10 on the recoil starter side, a ratchet 9 whose end is movable outwardly around the shaft 9a is radially provided on the stopper 8. They are attached to face each other. The recoil starter B is a recoil coil which is detachably attached to the protruding portion of the crankcase H so that the ratchet 9 attached to the recoil starter B and the stopper 8 of the magnet wheel 7 are arranged as described above. The recoil reel 10 is attached to the starter cover 11 with bolts 13 so as to be rotatable.

Thus, the starter device configured as described above operates as follows.

That is, when the electric starter A is rotated, the rotation is transmitted from the pinion gear 12 to the driven gear 4, and the driven gear 4 rotates. Due to the rotation of the driven gear 4,
The ratchet 5 attached thereto has its end portion radially outwardly centered on the shaft portion 5a due to centrifugal force, and engages with the stopper 2 provided on the side surface 1a of the working machine fan C. (See the chain double-dashed line in FIG. 2). Therefore, the working machine fan C is rotated, and as a result, the crankshaft D integrated with the working machine fan is rotated and the engine can be started.

At the time of starting by the electric starter A, the recoil starter B does not engage the stopper 8 on the crankshaft D side with the ratchet 9 on the recoil starter B side, so that the load on the recoil starter side is not applied to the crankshaft. Not transmitted at all.

On the contrary, when the engine is started by using the recoil starter B, if the rope of the recoil starter B is pulled, the recoil starter B rotates and the ratchet 9 attached to the end surface 10a of the recoil reel is The end portion of the shaft portion 9a projects outward and engages with the stopper 8 of the magnet wheel 7, and the rotation is transmitted from the recoil pulley 10 side to the crankshaft D side to start the engine. At the time of starting by the recoil starter B, since the stopper 2 on the crankshaft D side and the ratchet 5 on the electric starter A side are not engaged with each other, no load from the electric starter side is transmitted to the crankshaft.

Therefore, in the case of the present embodiment, when the electric starter A is attached, a stopper is provided on the side surface of the working machine fan C, and the driven gear is arranged side by side on the crankshaft shaft on the engine body side of the working machine fan. However, the electric starter can be easily attached only by providing the pinion gear so as to mesh with the driven gear. Moreover, the recoil starter can be lightly rotated at the time of starting without receiving a load on the electric starter side as in the conventional case.

Next, the second embodiment will be described.

In this embodiment (see FIG. 4), unlike the first embodiment, the driven gear 4 '(engaged means) is formed on the engine side surface 1a' of the working machine fan C itself. Gear 4 '
In the same manner as in the first embodiment, the electric starter A is configured to be able to transmit the rotation to the crankshaft via the pinion gear 12 'which is attached to the rotary shaft 6 of the starter A so as to project and move. There is. That is, the pinion gear 12 'and the rotary shaft 6 of the electric starter A are formed with spiral splines (not shown) on the inner and outer peripheral surfaces thereof, which mesh with each other, and support the pinion gear 12' and its shaft. A coil spring 15 that urges it to extend is interposed between the coil spring 15 and the engine frame portion 14.

Therefore, when the electric starter A rotates, the pinion gear 12 'projects toward the engine frame portion 14 side, meshes with the gear 4'formed on the working machine fan, and transmits the rotation to the crankshaft D. In this case, the load on the recoil starter side is not received, as in the case of the first embodiment.

When the engine is started by using the recoil starter, the pinion gear 12 'is set to the electric starter A
Since it is retracted to the side, the load on the electric starter side is not transmitted to the recoil starter side.

(Effect) Since the starter device for a general-purpose engine according to the present invention has the above-mentioned configuration, it has the following effects.

(1). Since the rotation of the electric starter is transmitted to the crankshaft of the engine by attaching the engaged means to the work machine fan, the electric starter can be attached to the general-purpose engine easily and inexpensively. That is, since the rotation is transmitted from the electric starter by providing the engaged means to the working machine fan that is necessarily provided due to the nature of the working machine, the electric starter is attached with the minimum necessary weight increase. can do. Therefore, the structure is simpler, lighter and less expensive than the conventional combined starter device.

(2). Further, since the structure is simple, there are few failures and maintenance is easy.

(3). Further, for the same reason as described above, it is more compact than the conventional combined starter device and does not impair the ease of handling, which is an essential condition of the portable working machine. Also, since the recoil starter and electric starter are installed at both ends of the crankshaft, the recoil starter can be installed in a position that is easy to handle when starting the engine manually, and the electric starter can be installed in a position that does not interfere with normal use. It becomes possible and an electric starter can be attached without impairing the usability of a portable engine.

(4). Because of the above-described configuration, the electric starter can be installed later in the general-purpose engine starter device having the existing recoil starter, if necessary. Therefore, since the electric starter can be handled as an optional product, the range of products can be expanded.

[Brief description of drawings]

FIG. 1 is a side view of a general-purpose engine with a partial cross section, FIG. 2 is a partially enlarged view showing an engaged mechanism of an engaged means and an engaging means as viewed from the arrow II in FIG. 1, and FIG. FIG. 1 is a layout view showing the positional relationship between the recoil starter and the electric starter viewed from the direction of the arrow II-II in FIG. 1, and FIG. 4 is a partially sectioned general-purpose engine showing the structure of the electric starter part showing another embodiment. It is a side view. A ... Electric starter, B ... Recoil starter, C ... Work machine fan, D ... Crankshaft, 1a
...... Side surface of work machine fan, 2 ... Stopper (engaged means), 5 ... Ratchet (engaged means), 4 '... Driven gear (engaged means), 12' ... Pinion gear (Engagement means).

Claims (1)

[Scope of utility model registration request] 1. A starter device for a general-purpose engine, comprising a recoil starter and an electric starter, and a working machine fan provided at a projecting portion of one end of a crankshaft, wherein the recoil starter is provided on a side of the crankshaft opposite to the working machine fan. Is provided on the other end side of the crankshaft, and a convex engagement means for starting is formed on the working machine fan attached to the crankshaft, and its rotating shaft is arranged near the working machine fan in parallel with the crankshaft. A driven gear that rotates coaxially with the crankshaft when rotation from the electric starter is transmitted is provided, and as the driven gear rotates, the driven gear projects outward due to centrifugal force. An engaging means for engaging the engaged means for starting is provided in the driven gear so that the starting gear can be started. A starter device for general-purpose engines, which is characterized in that