JP2002098030A - Recoil starter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recoil starter that can prevent deformation or the like of a reel and a case due to abnormal halfway engagement of an engine side and a ratchet. SOLUTION: The recoil starter for starting an engine via clutch engagement due to a rotation of a reel accommodating a rope has a starter case with a shaft, the reel rotatably mounted on the shaft and provided with projections on a surface opposed to a flywheel, a ratchet mounted on the reel for rotation about the shaft and axial movement and provided with engaging tongues capable of engagement with the projections, and a ratchet guide engaged with the ratchet in a frictionally turnable relation to the shaft so as to urge the ratchet projectively and retractively while guiding axial movement thereof. Projections on the ratchet are designed to engage and disengage with and from projections on the flywheel 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recoil starter used as an engine starter, and more particularly to a recoil starter having a clutch mechanism which moves in an axial direction and engages with an engine drive shaft.

[0002]

2. Description of the Related Art Conventionally, a recoil starter of this type includes, for example, a helical spline shaft rotatable integrally with a reel and a dog spline-fitted to the shaft and movable along the shaft. , The reel and the spline shaft are separately provided,
These can be connected to each other, or the spline shaft or dog is provided with a stopper for restricting the movement position of the dog (see Japanese Patent Publication No. 63-205457). A housing having a pulley rotatably mounted on the flywheel and having a slope facing the flywheel, mounted rotatably around the axis and movably in an axial direction along the axis, and always with the slope. A drive plate having an engaging element; and a brake plate having an element that engages the drive plate to move the plate in the axial direction to provide resistance to its rotation. The plate is configured to move in the axial direction along the axis to engage with the flywheel (Japanese Utility Model Publication No. 2-1958). Reference), a reel rotatably supported on a case, a cam provided on the reel toward the engine side, a dog rotatably supported coaxially with the reel and axially movable, and A retainer provided with a pawl capable of engaging with an engaging portion on the engine side and a cam follower provided so as to be engageable with the cam, and mounted on a reel capable of engaging with the dog and braking the rotation of the dog; A projection protruding from the reel and capable of engaging with the dog when the reel is started to rotate. Further, a separate cam is provided on the reel from the cam, and another cam engageable with this cam is provided. A cam follower provided on a dog (Japanese Patent Laid-Open No. 9-105371)
And the like are known.

[0003]

However, in the conventional recoil starters described above, a screw spline or an inclined surface is provided between the reel and the ratchet mechanism, and the ratchet is moved in the axial direction by using this as a guide. When the ratchet moves along the slope and engages with the protrusion or pulley on the engine side when the ratchet moves along the slope, in addition to the force to rotate the engine by the action of the lead angle of the screw and the angle of the inclined surface, the axial direction A component force is generated, which may cause deformation of the reel and the case.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem. Even when the engine side and the ratchet are engaged halfway, the axial component force is not generated, and the reel or the case is not driven. It is an object of the present invention to provide a recoil starter capable of preventing deformation and the like.

[0005]

SUMMARY OF THE INVENTION A recoil starter according to the present invention is a recoil starter for starting an engine in which a clutch is engaged by rotation of a reel for accommodating a rope, and a shaft arranged coaxially with a flywheel. A starter case, a reel rotatably mounted on the shaft and having a protrusion on a surface facing the flywheel 1, and a reel mounted on the reel and rotatable around the shaft and movable in the axial direction. A ratchet having a locking piece that can be engaged with the projection; and a ratchet guide that can be moved in and out while guiding the ratchet to move in the axial direction by frictionally rotating with the shaft and engaging with the ratchet. That the ratchet projections engage and disengage with the flywheel projections. It is an butterfly. The projection of the reel and the latching piece of the ratchet are engaged with each other on a plane parallel to the axial direction of the shaft, and a slant surface provided on the reel side of the ratchet, Is provided with a projection that engages with the inclined surface, the ratchet is pushed out to the flywheel side on the axis by one direction rotation, the projection escapes by the other direction rotation, and the ratchet can be immersed on the axis, and friction It is characterized in that the groove of the rotating ratchet guide engages with a projection parallel to the axis provided on the inner cylindrical portion of the ratchet, and the inner cylindrical portion of the ratchet has a surface facing the flywheel side. And a ratchet guide, which is provided with a groove that engages with the slanting projection. The ratchet guide is further provided with a slot which is open on one side across the axis, and the shaft or a cylinder fixed to the shaft. The cylindrical portion in contact with the portion is pressure-bonded by a spring so that the cylindrical portion frictionally and pivots in the radial direction.

That is, according to the present invention, even when the engine side and the ratchet mesh abnormally halfway, no axial component force is generated and deformation of the reel and the case is prevented.
The engagement surface for transmitting the power to rotate the engine between the reel and the ratchet has no slope portion and has only a surface parallel to the axial direction. The main feature is that the following two means are used to protrude and retract in the axial direction and ensure engagement with the engine side. The engagement between the projection of the reel and the inclined surface provided outside the central cylindrical portion of the ratchet, the groove of the ratchet guide having rotation resistance, and the projection parallel to the axis provided inside the central cylindrical portion of the ratchet. Engagement with the return spring. An inclined projection provided inside the central cylindrical part of the ratchet,
Means for engaging with the groove of the ratchet guide that rotates frictionally and combining with the return spring.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be described in detail hereinafter with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional side view showing an embodiment of a recoil starter according to the present invention, FIG. 2 is an exploded perspective view showing a reel, a ratchet and a ratchet guide of the recoil starter shown in FIG. 1, and FIG. (A) is an explanatory view showing a state before starting, (b) is an explanatory view showing a state at the time of starting, and FIG. 4 is a longitudinal sectional view showing another embodiment of the recoil starter of the present invention. , FIG.
6 is an exploded perspective view showing a reel, a ratchet, and a ratchet guide of the recoil starter shown in FIG. 4, FIG. 6 is an explanatory view showing an operation state of the same recoil starter, (a) is an explanatory view showing a state before starting, (b) ) Is an explanatory view showing a state at the time of starting. 1, 21 is a starter case, 2, 22 is a reel, 3, 23 is a ratchet, 4, 24 is a ratchet guide, 5, 25 is a fastening bolt, and 6, 26 is a bolt. rope,
7 and 27 are recoil springs, 8 and 28 are return springs, 10 and 30 are flywheels, 11 and 31 are cylindrical bodies, and 12 and 32 are springs.

1 and 2, a reel 2 is loosely inserted into a shaft 1-1 provided coaxially with a flywheel 10 so as to protrude inward in the axial direction substantially inward at a substantially central portion of a starter case 1. One end of the rope 6 wound around the rope winding groove 2-1 on the outer periphery of the reel 2 is pulled out from the rope through hole of the case 1 to the outside, and a knob (see FIG. (Not shown).
A cylindrical portion 2 protruding in the axial direction is provided on the back side of the reel 2.
-2 is provided on the outer periphery of the cylindrical portion 2-2.
Are externally fitted to be able to move back and forth in the axial direction, and are elastically supported via a return spring 8. A recoil spring (spring) 7 is accommodated in the recess of the reel 2 between the case 1 and the reel 2, and urges the reel 2 in the winding direction of the rope 6.

On the back side of the reel 2, as shown in FIG.
Flywheel 10 of large-diameter cylindrical portion 2-3 protruding in the axial direction outside cylindrical portion 2-2 at the central portion protruding in the axial direction.
A pair of opposed projections 2-4 protruding in the axial direction are provided on an end face facing the large diameter cylindrical portion 2-3.
A pair of opposed projections 2 projecting in the radial direction
-5 is provided.

The ratchet 3 has a projection 3-2a on the outer periphery of the cylindrical portion 3-1 facing the flywheel 10 and engaging with the projection 10-1 of the flywheel 10. A projection 3-2 formed by a slope 3-2b facing the projection 2-5 on the reel 2 side and a projection 2-4 on the reel 2 projecting in the radial direction to engage with the projection 3-2. Tab 3
-3 is provided, and a pair of opposed parallel projections 3-4 parallel to the axis are provided on the inner periphery of the cylindrical portion 3-1. The protrusion 2-4 of the reel 2 and the locking piece 3-3 of the ratchet 3 are engaged with each other on a plane parallel to the axial direction of the shaft 1-1. 3-5 is a spring seat of the return spring 8.

The ratchet guide 4 is connected to the shaft 1-
1 and has a function of engaging with the ratchet 3 so that the ratchet 3 can move in and out while guiding the ratchet 3 to move in the axial direction. A groove 4-1 with which the projection 3-4 is engaged;
A slot 4-2, one of which is open across the axis, is provided, and the cylindrical portion 4-3 which comes into contact with the shaft 1-1 or the cylindrical body 11 fixed to the shaft has friction in a radial direction.
It is crimped by a spring 12 so as to rotate, and the fastening bolt 5
At the shaft 1-1.

That is, the recoil starter described above
A shaft 1 provided coaxially with the flywheel 10;
A reel 2 rotatably mounted on the reel 1 and having a projection 2-4 on a surface facing the flywheel 10; and a reel 2 mounted on the reel 2 and rotatable around the shaft 1-1 and movable in the axial direction. A ratchet 3 having a locking piece 3-3 capable of engaging with the projection 2-4;
-1 to rotate and engage with the ratchet 3,
And a ratchet guide 4 that can be moved in and out while guiding the ratchet 3 to move in the axial direction.
Of the ratchet 3 is provided on the reel side of the ratchet 3, and the protrusion 2-2 is provided on the reel 2.
Due to the engaging action with -5, the ratchet 3 is pushed to the flywheel 10 side on the axis by one-way rotation, the projection 2-5 escapes by the other direction rotation, and the ratchet 3 can be immersed on the axis, In addition, a mechanism is provided in which the groove 4-1 of the ratchet guide 4 that rotates frictionally and the projection 3-4 provided on the cylindrical portion 3-1 of the ratchet 3 and parallel to the axis engage.

Next, the operation of the present invention constructed as described above will be described with reference to FIG. 3. Before starting, as shown in FIG. 3 (a), the ratchet 3 is in the reel 2 side, that is, in the retracted position. When the projection 2-5 of the reel 2 moves,
The protrusion 10-1 of the flywheel 10 and the protrusion 3-2a of the ratchet 3 are separated from each other at the upper end of the slope 3-2b provided on the protrusion 3-2 of the ratchet 3.

At the time of starting, as shown in FIG. 3B, a slope 3-2b provided on the reel side of the ratchet 3 and a reel 2 are provided.
The ratchet 3 is pushed axially toward the flywheel 10 by rotation in one direction due to the engaging action with the projection 2-5 provided on the flywheel 10, so that the projection 3-2a provided on the flywheel 10 side of the ratchet 3 Projection 10-1 of flywheel 10
, Whereby the flywheel 10 rotates to start the engine.

When the rope 4 is released after the engine is started, the reel 2 is rotated in reverse by the restoring force of the recoil spring 7, and the rope 6 is wound into the rope winding groove 2-1 of the reel 2, while the ratchet 3 is provided on the reel side. The slope 3-2b and the protrusion 2-5 provided on the reel 2 are separated from each other, and the ratchet 3 is pushed back to the reel 2 side on the axis by rotation in the other direction, so that the protrusion provided on the flywheel 10 side of the ratchet 3 3-2
a and the projection 10-1 of the flywheel 10 are separated, and return to the state before starting (FIG. 3A).

The recoil starter shown in FIGS. 4 and 5 has the same configuration as the recoil starter shown in FIGS. 1 to 3 except for the mechanism of engagement between the ratchet 23 and the ratchet guide 24. That is, in FIGS. 4 and 5, the reel 22 is loosely inserted into the shaft 21-1 provided coaxially with the flywheel 30 so as to protrude inward in a substantially central portion of the starter case 21 in the axial direction. , Reel 2
One end of the rope 26 wound around the rope winding groove 22-1 on the outer periphery of the case 2 is pulled out to the outside from the rope through hole of the case 21, and a knob (not shown) is provided at the end thereof so that the rope 6 can be easily pulled out. Is installed. A cylindrical portion 22-2 projecting in the axial direction is provided on the back side of the reel 22. A ratchet 23 is fitted around the outer periphery of the cylindrical portion 22-2 so as to be movable back and forth in the axial direction. It is elastically supported through. A recoil spring (spring) 27 is provided between the case 21 and the reel 22 in a concave portion of the reel 22.
And urges the reel 22 in the winding direction of the rope 26.

On the back side of the reel 22, a flywheel 30 of a large-diameter cylindrical portion 22-3 protruding in the axial direction outside the central cylindrical portion 22-2 protruding in the axial direction, similarly to the above.
A pair of opposing projections 22-4 protruding in the axial direction are provided on the end face opposite to.

The ratchet 23 is different from the one shown in FIGS. 1 to 3 and has a structure as shown in FIGS. 4 and 5 on the outer periphery of the cylindrical portion 23-1 facing the flywheel 30 side. Projection 2 engaging with projection 30-1 of 30
3-2a, a locking piece 23-3 projecting in the radial direction and engaging with the projection 22-4 on the reel 22 side is provided. Further, on the inner periphery of the cylindrical portion 23-1, slopes 23-4a, 23-3 are provided. -4b
Are provided. The projection 22-4 of the reel 22 and the locking piece 23-3 of the ratchet 3 are configured to engage with each other on a plane parallel to the axial direction of the shaft 21-1. 23-
5 is a spring seat of the return spring 28.

The ratchet guide 24 is shown in FIGS.
In the same manner as shown in FIG.
Has a function of being able to protrude and retract while guiding it to move in the axial direction, and has a groove 24-1 on the outer periphery where an inclined projection 23-4 provided on the ratchet 23 engages, A slot 24-2, one of which is open, is provided,
The shaft 21-1 or the cylindrical portion 24-3 in contact with the cylindrical body 31 fixed to the shaft is pressure-bonded by a spring 32 so as to rotate and friction in the radial direction.
At the shaft 21-1.

The operation of the recoil starter having the structure shown in FIGS. 4 and 5 will be described below with reference to FIG.
Before the start, as shown in FIG. 6A, the ratchet 23 moves to the reel 22 side, that is, the retracted position, and the groove 24-1 of the ratchet guide 24 becomes the inclined protrusion 23-4 of the ratchet 23.
And the projection 30-1 of the flywheel 30
And the projection 23-2a of the ratchet 23 are in a detached state.

At the time of starting, as shown in FIG. 6B, the inclined surfaces 23-4a, 23-4 of the inclined protrusions 23-4 provided on the reel.
4b and the ratchet guide 24 are engaged with the groove 24-1 so that the ratchet 23 is pushed axially toward the flywheel 30 by rotation in one direction, so that the protrusion provided on the flywheel 30 side of the ratchet 23 is formed. 23-2a engages with the projection 30-1 of the flywheel 30, whereby the flywheel 30 rotates and the engine starts.

When the rope 24 is released after the engine is started, the reel 22 reverses due to the restoring force of the recoil spring 27, and the rope 24 is wound into the rope winding groove 22-1 of the reel 22, while the inclined projections 23- 4 slope 23-
4a, 23-4b and the groove 24- in the ratchet guide 24.
The ratchet 23 is pushed back toward the reel 22 on the axis by the rotation in the other direction due to the engagement action with the ratchet rod 1, so that FIG.
It returns to the state before starting shown in.

[0023]

As described above, according to the present invention,
The engagement between the reel and the ratchet, which transmits the power to rotate the engine, is eliminated from the engaging surface, leaving only the surface parallel to the axial direction. Also, no axial component force is generated, and deformation of the reel and the case can be prevented.In addition, the engagement between the protrusion of the reel and the inclined surface provided outside the central cylindrical portion of the ratchet can be prevented. A combination of a groove of a ratchet guide having rotation resistance, a projection parallel to an axis provided inside the central cylindrical portion of the ratchet, and a return spring; By using the combination of the inclined projection provided with the groove of the ratchet guide that rotates frictionally and the return spring, the ratchet is made to protrude and retract in the axial direction, and An excellent effect of being able to ensure the engagement of the down side.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a recoil starter according to the present invention.

FIG. 2 is an exploded perspective view showing a reel, a ratchet, and a ratchet guide of the recoil starter shown in FIG.

3A and 3B are explanatory diagrams showing an operation state of the recoil starter, in which FIG. 3A is an explanatory diagram showing a state before starting, and FIG. 3B is an explanatory diagram showing a state at the time of starting.

FIG. 4 is a longitudinal sectional view showing another embodiment of the recoil starter according to the present invention.

FIG. 5 is an exploded perspective view showing a reel, a ratchet, and a ratchet guide of the recoil starter shown in FIG.

FIGS. 6A and 6B are explanatory diagrams showing an operating state of the recoil starter, in which FIG. 6A is an explanatory diagram showing a state before starting, and FIG. 6B is an explanatory diagram showing a state at the time of starting.

[Explanation of symbols]

 1,21 Starter case 2,22 Reel 3,23 Ratchet 4,24 Ratchet guide 5,25 Fastening bolt 6,26 Rope 7,27 Recoil spring 8,28 Return spring 10,30 Flywheel 11,31 Cylindrical body 12,32 Spring

Claims (6)

[Claims] In a recoil starter for starting an engine, a starter case having a shaft arranged coaxially with a flywheel is rotatably mounted on the shaft. A reel having a projection on a surface facing the flywheel, and a ratchet having a locking piece mounted on the reel, rotatable around the shaft and movable in the axial direction, and capable of engaging with the projection. A ratchet guide that can rotate and frictionally rotate with respect to the shaft and engage with the ratchet to be able to protrude and retract while guiding the ratchet to move in the axial direction, and the protrusion of the ratchet is connected to the protrusion on the flywheel side. A recoil starter having a mechanism capable of engaging and disengaging. 2. The recoil starter according to claim 1, wherein the projection of the reel and the latching piece of the ratchet are engaged with each other on a plane parallel to the axial direction of the shaft. 3. A slope provided on the reel side of the ratchet, and a projection provided on the reel, the projection engaging with the slope. The ratchet is pushed to the flywheel side on the axis by one direction rotation, and is projected by the other direction rotation. Has escaped and the ratchet can be immersed on the axis, and a mechanism is provided in which the groove of the ratchet guide that rotates frictionally and the projection parallel to the axis provided on the inner cylindrical portion of the ratchet are engaged. The recoil starter according to claim 2, characterized in that: 4. The cylindrical portion of the ratchet has a slanted projection composed of a slope facing the flywheel and a slope facing the reel, and the ratchet guide engages with the slope projection. 3. A groove is provided.
Recoil starter as described. 5. The recoil starter according to claim 3, further comprising a return spring for urging the ratchet toward the reel. 6. The ratchet guide is provided with a slit which is open on one side across the axis, and a cylindrical portion which comes into contact with the shaft or a column fixed to the shaft has friction in a radial direction. 5. The recoil starter according to claim 3, wherein the recoil starter is pressed by a spring so as to rotate.