JPH0122943Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a foreign matter ejecting device for a recoil starter for manually starting an engine.

A small engine installed in a power tiller or the like is usually equipped with a recoil starter that starts the engine by pulling a recoil rope. The outline of this device is that it includes a recoil pulley (rotational drive member) around which a recoil rope is wound, and a rotating driven member that is placed coaxially with the recoil pulley and connected to the engine side, for example, the crankshaft.The device pulls the recoil rope during startup. Then rotate the recoil pulley above,
Further, a drive pawl that is pivotally supported on the side of the pulley engages the driven member and rotates it together, and after the engine is started, the drive pawl and driven member are disengaged from each other to start the engine. This is what we do.

Incidentally, since the engine is started based on this principle, the operation of the drive pawl is extremely important for smooth engine starting. In other words, the drive pawl must be quickly projected by the rotation of the recoil pulley, be reliably held at the normal projected position, and transmit power.

Therefore, the driving pawl is normally caused to protrude smoothly by the action of a friction plate, and an engaging portion is provided for regulating the protrusion to a normal position and transmitting power.

On the other hand, engines equipped with this type of recoil starter are mainly stationary engines used in power tillers and various types of work equipment, and there are many opportunities for foreign matter to get mixed in.
For this reason, if a foreign object intervenes between the recoil starter's drive pawl and the engaging portion that locks and restricts the recoil starter when it is protruded, the drive pawl may not be able to maintain its normal protruding position, which may impede engine starting.

The purpose of the present invention is to eliminate such harmful effects, and to provide a recoil starter foreign matter ejector that quickly expels foreign matter even if it gets mixed in, and enables smooth and reliable engine starting at all times. provide.

In order to achieve the above-mentioned purpose, the present invention has a driving pawl that is pivotally supported on the side of the recoil pulley, and as the recoil pulley rotates, the driving pawl projects outward in the radial direction, and is rotated toward the engine by this driving pawl. It is applied to a recoil starter that transmits the power, and its main components include a locking wall that receives the drive reaction force of the drive pawl that protrudes from the side surface of the recoil pulley, and a locking portion of the locking wall that receives the drive reaction force of the drive pawl. An opening for discharging foreign matter is provided on the side surface of the recoil pulley located at the recoil pulley, so that even if foreign matter gets mixed in, the foreign matter will not remain on the locking wall and the side surface of the recoil pulley and will be quickly discharged.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, FIG. 1 shows a partially cutaway front view of a recoil starter equipped with a foreign matter ejecting device according to the present invention, and FIG. 2 shows a side sectional view of the same (line A-A in FIG. 1).

First, in order to clarify the present invention, the overall schematic structure of the recoil starter will be explained. The recoil starter designated by reference numeral 1 includes a starter case 2 on the outermost side, and a support portion 3 is fixedly installed in the center of the starter case 2. A disc-shaped recoil pulley 4 is rotatably supported on the support portion 3, and a return spring 5 is disposed on one side of the recoil pulley 4 so that the recoil pulley 4 returns to its original position after rotation. do. A winding groove 4a for a recoil rope 6 formed in a U-shaped cross section is provided on the outer periphery of the recoil pulley 4, and a drive claw 8 is rotatably supported on the other side of the recoil pulley 4 by a support shaft 7. Further, a friction plate 9 is attached to the tip of the support part 3 with a bolt 1.
0, and a friction spring 11 applies a certain amount of friction. Note that this friction plate 9 is provided with a locking portion for locking the drive claw 8. On the other hand, the recoil rope 6 has its inner end connected to the winding groove 4a of the recoil pulley 4.
A grip 12 is fixed to the outer end of the rope 6, which is attached to the bottom, wound inside the winding groove 4a, and pulled out from the pull-out hole 2a provided in the side of the starter case 2.

To start the engine, use grip 12.
If you hold it with your hand and pull strongly in the direction of pulling out the recoil rope 6, the recoil pulley 4 will also rotate accordingly.
Further, due to the delay action of the friction plate 9, the driving pawl 8 projects outward, and this driving pawl 8 engages with a rotating driven member (not shown) and transmits rotation thereto. As mentioned above, the rotating driven member is connected to the crankshaft of the engine, and rotation is ultimately transmitted to the crankshaft. After the engine is started, the rotating driven member rotates, and due to this rotation, the return action of the friction plate 9, and the return action of the recoil pulley 4, the drive claw 8 returns to the inside of the outer periphery of the friction plate 9. and functions to release the lock of the rotating driven member.

Next, the foreign matter ejecting device, which is the main part of the present invention, will be explained in detail.

First, the recoil pulley 4 is integrally molded, for example, from synthetic resin. The recoil pulley 4 is located at the outermost periphery of the winding groove 4.
A winding part 13 having a U-shaped cross section forming a shape, a ring-shaped support plate part 14 extending from the center of this winding part 13 toward the center, a cylindrical part 15 inside this support plate part 14, and a cylindrical part 15 on the innermost periphery. A shaft bearing part 16 that is positioned and fitted into the support part 3 provided on one side, and a storage part 17 for the friction plate 9 provided on the other side, this storage part 1
It consists of a side surface portion 18 that connects the outer wall 7 and the inner wall of the cylindrical portion 15 .

In addition, a recoil rope 6 is provided in a part of the side surface 18.
At the same time, a support portion 20 for the support shaft 7 is formed, and the drive claw 8 is rotatably supported on the support shaft 7 attached to the support portion 20. The driving claw 8 is formed by forming a plate material having a predetermined wall thickness into a relatively long and thin plate as shown in FIG. The driving claw part 8b is engaged, and the other end thereof is a regulating piece part 8c which restricts the protrusion of the driving claw part 8b and receives a driving reaction force.

On the other hand, a locking wall portion 21 that engages with the inner side portion 8d of the regulating piece portion 8c and receives the driving reaction force of the driving claw 8 is integrally provided on the side surface portion 18. Therefore, if the recoil pulley 4 is rotated at the time of starting, the regulating piece 8c
The larger driving claw portion 8b projects outward in the radial direction due to the delaying action of the friction plate 9, and this projecting length is increased by the engagement and abutment of the regulating piece portion 8c against the locking wall portion 21. decide.

On the other hand, an opening 22 for discharging foreign matter is provided in the side surface 18 located at the portion of the locking wall 21 that locks with the regulating piece 8c. This opening 22 is shown in side view 18.
A part of the recoil pulley 4 is provided so as to penetrate in the direction of the rotation axis of the recoil pulley 4, and eventually communicates with the opposite side of the recoil pulley 4. It is desirable that this opening 22 has a size that allows at least foreign objects (for example, pebbles, etc.) to pass therethrough, and that a portion of its inner wall is located on an extension of the wall surface of the locking wall portion 21, as shown clearly in FIG. Further, in the embodiment, there may be one opening, but there may be a plurality of openings, and the inner wall may have a certain slope.

Next, the functions of the main parts of the present invention will be explained.
First, when the engine is not started, the drive claw 8 is turned off as described above.
has returned to the inside of the outer periphery of the friction plate 9, and is no longer engaged with the engine side.
The regulating piece 8c of the driving claw 8 is located at the regulating piece 80c indicated by the imaginary line in FIG. 1, and is relatively close to the outer periphery.

Now, let us assume that a foreign object such as a pebble gets mixed in along the path shown by arrow B during work and becomes interposed between the regulating piece 80c and the locking wall 21. In this case, conventionally, the regulating piece 80c, the locking wall 21, the side surface 1
8.Furthermore, foreign matter remains in the closed space surrounded by the friction plate 9, and as a result, at the time of startup, the regulating piece 80c closes to the locking wall portion 21 due to the intervention of the foreign matter.
As a result, the drive claw 8 was unable to project properly.

However, in the present invention, even if foreign matter gets mixed in, the opening 22 provided in the side surface 18 is
Foreign matter is discharged through the opening 22 to the opposite side of the recoil pulley 4 due to engine vibration and movement of the restriction piece 80c, and the restriction piece 80c
does not interfere with the normal movement of

In the above embodiments, the inner side 8 of the regulating piece 8c
Although the locking wall portion 21 that locks on the drive claw portion 8b is shown as an example, a locking wall portion that locks on the outer side portion of the drive claw portion 8b may be provided. Other arbitrary changes in the detailed shape, structure, etc. without departing from the essential parts are permitted within the scope of the present invention, without being limited to the embodiments.

In addition, in the figure, the reference numerals 23, which do not require any particular explanation, indicate rib pieces.

As described above, since the recoil starter foreign matter discharge device according to the present invention has the opening for foreign matter discharge in the recoil pulley, foreign matter can be quickly discharged and the engine can be started smoothly and reliably at all times.

In addition, since the opening can be easily provided during molding of the recoil pulley, it has various features such as excellent manufacturability and low cost.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of a recoil starter equipped with a foreign matter ejecting device according to the present invention, and FIG. 2 is a side sectional view of the same (line AA in FIG. 1). In the drawing, 4 is a recoil pulley, 8 is a drive pawl,
18 is a side surface, 21 is a locking wall, and 22 is an opening.

Claims (1)

[Scope of utility model registration request] In a recoil starter, a drive pawl is pivotally supported on a side surface of a recoil pulley, the drive pawl projects radially outward as the recoil pulley rotates, and the rotation is transmitted to the engine side by the drive pawl. A locking wall portion that receives a driving reaction force is provided protrudingly on the side surface of the recoil pulley, and an opening for discharging foreign matter is provided on the side surface of the recoil pulley located at the locking portion of the locking wall portion. Features a recoil starter foreign matter ejector.