JP2003247477A - Recoil starter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recoil starter provided with a unidirectional rotation mechanism which is capable of lessening an outer form and excellent in imposing workability. <P>SOLUTION: In the recoil starter where a driving wheel is rotated via a rope reel having wound a recoil rope, a turning force is accumulated in an accumulation means arranged between the driving wheel and a starting pulley connected to the engine side, and the engine is started by rotating a crankshaft via the starting pulley with the turning force accumulated in the accumulation means. The unidirectional rotation mechanism for rotating the driving wheel only for the rotational direction to start the engine is formed between the side face and the case of a driving part side along the circumference of the driving wheel. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recoil starter for rotationally driving a crankshaft of an internal combustion engine to start the engine, and more particularly to a storage means provided between a rope reel and a driven pulley. The present invention relates to a power storage type recoil starter in which a starting pulley connected to a crankshaft side is rotated by a rotational force stored in a power storage means.

[0002]

2. Description of the Related Art A conventional recoil starter equipped with a power storage means made of a mainspring or the like between a rope reel around which a recoil rope is wound and a starting pulley connected to the crankshaft side of an engine is shown in FIG. As shown, a rope reel 51 around which the recoil rope 50 is wound, a drive wheel 53 rotated by the rope reel 51 via a ratchet mechanism 52, and the drive wheel 53 and the crankshaft of the engine are connected. It is provided with a force accumulating means 55 composed of a mainspring or the like interposed between the starting pulley 54 and the starting pulley 54.

The rotation of the rope reel 51 rotated by pulling the recoil rope 50 causes the ratchet mechanism 5 to rotate.
2 is transmitted to the drive wheel 53 to rotate the drive wheel 53, and the drive wheel 53 is rotated to cause the power storage means 55 to store a rotational force. The rotational force stored in the power storage means 55 causes the starting pulley. It is configured to rotate 54 to start the engine. In the mechanism in which the force accumulating means 55 is interposed between the drive wheel 53 and the starting pulley 54 as described above, the drive wheel 53 receives the rotational force in the opposite direction due to the rotational force accumulated in the force accumulating means 55, so A one-way rotation mechanism 56 is formed to prevent the wheel 53 from rotating in the opposite direction.

The conventional one-way rotating mechanism 56 has a power storage means 5
5, a plurality of locking portions 57 are formed in the circumferential direction on the outer peripheral surface of the drive wheel 53 accommodating the mainspring, and the support shaft 5 is formed on the inner surface of a case 58 accommodating the drive wheel 53 and the like.
9, a ratchet member 60 that can be engaged with and disengaged from the locking portion 57 is pivotally supported by the support shaft 59, and the ratchet member 60 is attached to the outer peripheral surface of the drive wheel 53 by a spring 61. The drive wheel 53 is prevented from rotating in the opposite direction by engaging the ratchet member 60 with the locking portion 57, and the drive wheel 53 starts the engine by the rope reel 51. Ratchet member 6 when rotated to
0 comes into contact with the outer peripheral surface of the drive wheel 53 and is retracted to the outside to allow the rotation of the drive wheel 53.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
One-way rotation mechanism 5 in recoil starter equipped with 5
Since No. 6 is formed on the outer peripheral side of the drive wheel 53, the outer shape of the case 58 for accommodating these mechanisms is inevitably large, and an adapter is required for assembling to the engine. I have a problem. It is an object of the present invention to provide a recoil starter having a one-way rotation mechanism which can be reduced in outer shape and is excellent in assemblability.

[0006]

In order to solve the above-mentioned problems, the present invention rotates a drive wheel via a rope reel around which a recoil rope is wound, and between the drive wheel and a starting pulley connected to the engine side. In the recoil starter configured to store the rotational force in the disposed power storage means and rotate the crankshaft via the starting pulley by the rotational force stored in the power storage means to start the engine, A one-way rotation mechanism for rotating the wheel only in the rotation direction for starting the engine is formed between the side surface on the drive unit side along the outer peripheral edge of the drive wheel and the case.

According to a second aspect of the present invention, the one-way rotation mechanism is formed on a locking projection formed on a side surface along the outer peripheral edge of the drive wheel and on an inner surface of the case facing the locking projection. And a rocking claw that is swingably disposed in the recess, and the locking projection has a locking surface formed on the front surface in the direction of preventing rotation and an inclined surface formed on the opposite side. The swing claw is formed with an engagement surface capable of engaging with the locking surface.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the examples shown in the drawings. As shown in FIG. 1, the recoil starter 1 of the present invention starts an engine by pulling a recoil rope 4 through a recoil handle 3 exposed to the outside of a case 2. As shown in FIG. 2, in the case 2, a rope reel 5 around which a recoil rope 4 connected to a recoil handle 3 is wound is rotated from a case 2 toward a support shaft 6 integrally formed to project inward. It is supported freely.

A spiral spring 7 for recoil is housed between the rope reel 5 and the case 2. One end of the spiral spring 7 is locked to the rope reel 5 and the other end is locked to the case 2.
The mainspring 7 includes a rope reel 5 to a recoil rope 4
When the rope reel 5 is towed and the rope reel 5 is rotated, a rotational force is accumulated in the mainspring 7, and the mainspring 7 is released by releasing the hand or pulling the recoil rope 4.
The recoil rope 4 is wound around the rope reel 5 by rotating the rope reel 5 in the opposite direction by the rotational force accumulated in the above.

A drive wheel 8 is supported coaxially with the rope reel 5 by the support shaft 6 so as to be rotatable coaxially with the rope reel 5, and a drive wheel 8 is provided between the drive wheel 8 and the rope reel 5. The directional rotation clutch 9 is interposed, and the rope reel 5 is connected via the unidirectional rotation clutch 9.
And the drive wheel 8 are rotationally connected. In the one-way rotation clutch 9, when the recoil rope 4 is pulled by engaging and disengaging the engaging claw member 27 formed on the side surface of the rope reel 5 with the engaging hole 28 formed on the side surface of the drive wheel 8. Rotation of the rope reel 5 side is transmitted to the drive wheel 8, and when the recoil rope 4 is rewound on the rope reel 5, the one-way rotation clutch 9 is used when rotating in the opposite direction.
This prevents the rotational force from being transmitted to the drive wheel 8.

A support shaft 10 having a diameter smaller than that of the support shaft 6 is concentrically formed inside the support shaft 6 formed in the case 2, and the support shaft 10 transmits a rotational force to a crankshaft of an engine. A starting pulley 11 for rotatably supporting the activating pulley 11 is rotatably supported. A washer 12 and a screw 13 are attached to the tip of the support shaft 10 to form a retainer for the rope reel 5, the drive wheel 8 and the starting pulley 11.

On the side surface of the drive wheel 8 facing the starting pulley, there is formed a concave portion which is open in one direction, and the concave portion accommodates the mainspring 14 which constitutes the power storage means. 15, and the mainspring 14 that constitutes the power storage means accommodated in the mainspring case 16 is accommodated therein. As shown in FIG. 3, the outer peripheral side end 14 a of the mainspring 14 is held by the drive wheel 8 via the mainspring case 16 arranged in the mainspring housing portion 15, and the inner peripheral side end 14 b is attached to the starting pulley 11. It is accommodated and held in the formed recess 11a.

When the drive wheel 8 is rotated via the rope reel 5 which is rotated by pulling the recoil rope 4, the rotation is transmitted to the starting pulley 11 via the mainspring 14, but the starting pulley 11 side is the engine When the rotation is blocked by the starting resistance, the drive wheel 8 winds up the mainspring 14, and the rotational force is stored in the mainspring 14. When the stored force of the mainspring 14 exceeds the starting resistance of the engine acting on the starting pulley 11, the starting pulley 11 is rotated all at once by the rotational force stored in the mainspring 14, and the engine is started via the centrifugal clutch mechanism 17. Be done

Between the drive wheel 8 and the case 2, a one-way rotating mechanism 2 for preventing the drive wheel 8 from rotating in the opposite direction due to the rotational force applied to the mainspring 14.
0 is formed so that the drive wheel 8 is rotated only in the direction in which the engine is started. As shown in FIGS. 4 and 5, the one-way rotation mechanism 20 includes a plurality of locking projections 21 formed on the side surface of the drive wheel 8 along the outer peripheral edge thereof, and a case 2 facing the locking projections 21. The rocking claw 22 is housed in the recess 2a formed inside. The locking protrusion 21
A plurality of annular projections protruding in the side direction are formed along the circumferential direction along the outer peripheral edge of the drive wheel 8 facing the rope reel 5 side, and the locking projection 21 is forward of the locking start 21 in the engine start rotation direction. An inclined surface 23 is formed on the side, and a substantially vertical locking surface 24 is formed on the rear side.

A recess 2a is formed in a part of the case 2 corresponding to the locking projection 21. The recess 2a is brought into contact with the locking surface 24 of the locking projection 21 in the reverse direction of the drive wheel 8. Swing claw 2 having an engagement surface 25 for preventing rotation
2 is swingably accommodated, and the swing claw 22 has an engaging surface 25 by abutting the other end of a leaf spring 26 held by a part of the swing claw 22 to the case 2. Is urged in a direction in which the side surface of the drive wheel 8 is pressed.

When the drive wheel 8 is rotated in the direction to start the engine by the rotation of the rope reel 5, the swinging pawl 26 is resisted by the inclined surface 23 of the drive wheel 8 against the spring biasing force, and inside the recess 2a of the case 2. Although the drive wheel 8 is allowed to rotate by moving the drive wheel 8 toward the drive wheel 8 in the reverse direction by the mainspring 14 when the power is applied to the mainspring 14, the drive wheel 8 is rotated in the opposite direction. The engagement surface 25 engages with the engagement surface 24 of the engagement protrusion 21 to prevent the drive wheel 8 from rotating in the opposite direction. The locking projection 21 and the swing claw 26 are preferably arranged on the side surface as close to the outer peripheral edge of the drive wheel 8 as possible.

The operation of the one-way rotating mechanism 20 according to the above embodiment will be described. When the recoil handle 3 is pulled, the recoil rope 4 is pulled and the rope reel 5 rotates, and the engagement claw member 27 of the one-way rotation clutch 9 engages with the engagement hole 28 of the drive wheel 8 to rotate the drive wheel 8. And energy storage means 1
The starting pulley 11 is rotated via 4. When the drive wheel 8 is rotated via the rope reel 5, FIG.
As shown in (a), the swing claw 22 of the one-way rotation mechanism 20.
Is separated from the locking projection 21 by the inclined surface 23 of the drive wheel 8 to allow rotation. The engine starting resistance is generated on the side of the starting pulley 11, the rotation is stopped, and the drive wheel 8 is further rotated, so that the power spring 14 which is a power storage means.
The rotational force is stored in. The rotational force stored in the mainspring 14 tends to rotate the drive wheel 8 in the opposite direction, but as shown in FIG.
Engages with the locking surface 24 of the locking projection 21 to drive the drive wheel 8
Reverse rotation is prevented. Therefore, the rotational force in the opposite direction is not transmitted to the rope reel 5 side, and the rotational force stored in the power spring 14 which is the power storage means is maintained.

[0018]

As described above, the one-way rotating mechanism 2 of the present invention is used.
According to 0, since the locking projection 21 is formed on the side surface along the outer peripheral edge of the drive wheel 8 and the swing claw 22 facing the locking projection 21 is provided on the case side, the drive wheel 8 It is not necessary to dispose components such as a ratchet pawl and a ratchet spring that constitute the conventional one-way rotation mechanism on the outer peripheral surface of the recoil starter 1, and the recoil starter 1 can be formed in a small external shape. Further, since the swing claw 22 is swingably housed in the recess 2a formed on the inner surface of the case 2, the outer shape of the case 2 can be downsized, the dust resistance performance can be improved, and a small engine can be provided. It becomes possible to attach without using an adapter at the time of attachment.

[Brief description of drawings]

FIG. 1 is a front view of a recoil starter implementing a one-way rotation mechanism of the present invention.

FIG. 2 is a vertical sectional side view of the same recoil starter.

3 is a sectional view taken along the line AA in FIG.

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is a perspective view of a member forming a one-way rotation mechanism.

FIG. 6 is a cross-sectional view showing an operating state of the one-way rotation mechanism, FIG. 6A is a state in which the swing claw is separated from the locking projection,
(B) shows a state in which the swinging claw engages with the locking projection to prevent reverse rotation.

FIG. 7 is a sectional view of a recoil starter implementing a conventional one-way rotation mechanism.

[Explanation of symbols]

1 recoil starter 2 cases 5 rope reel 6 spindles 8 drive wheels 9 one-way rotating clutch 10 spindles 11 Starting pulley 14 Power storage means (spring) 15 Mainspring accommodation 16 spring case 17 Centrifugal clutch mechanism 20 One-way rotation mechanism 21 Locking protrusion 22 Swinging claw 23 Inclined surface 24 Locking surface 25 Engaging surface 26 leaf spring

Continued front page    (72) Inventor Isao Toyama             4-4 Momoi, Suginami-ku, Tokyo Star             Inside Teng Kogyo Co., Ltd.

Claims (2)

[Claims] 1. A drive wheel is rotated through a rope reel around which a recoil rope is wound, and a force accumulating means arranged between the drive wheel and a starting pulley connected to the engine side stores a rotational force. In a recoil starter in which a crankshaft is rotated by a rotating force accumulated in the force accumulating means via a starting pulley to start an engine, the drive wheel is rotated only in a rotational direction in which the engine is started. A recoil starter characterized in that a rotating mechanism is formed between a side surface of the drive wheel on the side of a drive unit along an outer peripheral edge of the drive wheel, and a case accommodating the drive wheel, the rope reel, and the energy storage means. 2. The one-way rotation mechanism is swingable in a locking projection formed on a side surface along an outer peripheral edge of a drive wheel and a recess formed on an inner surface of a case facing the locking projection. And a slanting surface formed on the opposite side to the locking surface formed on the front surface in the direction to prevent rotation. The recoil starter according to claim 1, wherein the recoil starter forms an engagement surface that is engageable with the locking surface, and biases the swing claw in a lateral direction of the drive wheel.