JP2003269299A - Recoil starter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recoil starter with a clutch mechanism excellent in assemblability especially on a small engine by reducing an outer form. <P>SOLUTION: The recoil starter for starting an engine with turning force stored in a force storing means 14 forms, between opposed sidewall surfaces of a rope reel 5 and a driving wheel 8 coupled to the force storing means 14, a clutch mechanism 9 comprising locking projections 20 formed on one sidewall surface and provided with a locking surface 23 and a sloping surface 24, and a plate spring 22 mounted on the other sidewall surface and integrally provided with locking tongues 21 capable of engaging the locking surface 23. <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 driving a crankshaft of an internal combustion engine by pulling a recoil rope to start the engine.
In particular, the present invention relates to a recoil starter in which rotation of a rope reel rotated by a recoil rope is transmitted to a driven side via a clutch mechanism.

[0002]

2. Description of the Related Art A conventional recoil starter in which a clutch mechanism is formed between a rope reel around which a recoil rope is wound and a drive wheel connected to the crankshaft side of an engine is shown in FIG. And a drive wheel 53 that is rotated by the rope reel 51 via a clutch mechanism 52. The drive wheel 53 and a starting pulley 54 that is connected to the crankshaft of the engine. Are connected by a power storage means 55 constituted by.

The clutch mechanism 52 controls the rotation of the rope reel 51 rotated by pulling the recoil rope 50.
Drive wheel 5 is transmitted to drive wheel 53 via
3, the drive wheel 53 rotates to cause the force accumulating means 55 to accumulate a rotational force, and the rotational force accumulated in the force accumulating means 55 causes the starting pulley 54 to rotate and start the engine. Is configured. The drive wheel 53 receives a rotational force in the opposite direction due to the rotational force accumulated in the force accumulating means 55, so that the drive wheel 53 does not rotate in the opposite direction. 56 is formed.

The clutch mechanism 52 has a concave portion 57 formed on a side surface of the rope reel 51 facing the drive wheel 53 side, and a clutch member 58 is accommodated in the concave portion 57 so that the clutch member 58 is arranged on the drive wheel 53 side. Clutch spring 5
This clutch member 5 is biased by a spring 9
The clutch member 5 is provided on the side surface of the drive wheel 53 that faces 8
8 is formed by forming a concavo-convex portion 60 which can be engaged.
Then, when the recoil rope 50 is pulled and the rope reel 51 is rotated in the engine starting direction, the clutch member 58 engages with the concave and convex portion 60 to rotate the drive wheel 53 in the engine starting direction and rotate to the power saving means 55. Make the power live. In order to rewind the recoil rope 50 pulled out from the rope reel 51 onto the rope reel 51, the mainspring 61
When the rope reel 51 rotates in the reverse direction due to the accumulated rotational force, the clutch member 58 is disengaged from the concave-convex portion 60 and the transmission is interrupted, allowing the reverse rotation of the rope reel 51.

[0005]

In the conventional clutch mechanism 52, the clutch member 5 is provided between the rope reel 51 which is a driving side member and the driving wheel 53 which is a driven side member.
It is necessary to form a concave portion 57 for accommodating the clutch 8 and the clutch spring 59, and the axial dimension of the recoil starter is inevitably large, resulting in poor assembling to a small engine. It is an object of the present invention to provide a recoil starter having a clutch mechanism that can be reduced in outer shape and is particularly easy to mount on a small engine.

[0006]

In order to solve the above-mentioned problems, a recoil starter of the present invention stores the rotational force of a drive unit equipped with a rope reel which is rotationally driven by pulling a recoil rope, on the engine side. In the recoil starter configured to transmit the torque to the force storing means through the clutch mechanism to store the torque in the power storing means, and to start the engine by the torque stored in the power storing means. A clutch mechanism formed between the force means is formed on one side wall surface between the opposite side surfaces of the drive reel connected to the rope reel and the force storage means, and has a locking surface and an inclined surface. And a leaf spring attached to the other side wall surface and integrally formed with a locking claw piece that is engageable with the locking surface. Engage with one piece By, characterized in that the animal power unit side to rotate transmitted only to the engine starting rotational direction.

According to another aspect of the recoil starter of the present invention, the number of the locking projections formed on the one side wall surface and the number of locking claw pieces formed on the leaf spring are different depending on whether one is even and the other is odd. Are formed respectively.

[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 FIGS. 2 and 3, a support shaft 6 is integrally formed with the case 2 so as to project inwardly of the case 2, and the drive wheel 8 is attached to the support shaft 6. This drive wheel 8 is rotatably mounted.
The recoil rope 4 is attached to the boss protruding in the lateral direction of the
The rope reel 5 wound around is rotatably supported by the drive wheel 8.

A spiral spring 7 for recoil is arranged between the rope reel 5 and the case 2, and 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 stores the rotational force in the mainspring 7 by pulling the recoil rope 4 from the rope reel 5 and rotating the rope reel 5, and releasing the hand from the recoil rope 4 or loosening the pulling force. The rope reel 5 is rotated in the opposite direction by the rotational force accumulated in the mainspring 7, and the recoil rope 4 is wound around the rope reel 5.

A clutch mechanism 9 is interposed between the drive wheel 8 rotatably supported by the support shaft 6 and the rope reel 5, and the rope reel 5 and the drive wheel 8 are connected via the clutch mechanism 9. It is rotationally connected.
The clutch mechanism 9 transmits the rotation on the rope reel 5 side when the recoil rope 4 is pulled to the drive wheel 8, and interrupts the transmission when the recoil rope 4 is rewound on the rope reel 5 in the opposite direction. The rotational force is not transmitted to the drive wheel 8 on the driven side.

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 prevent the rope reel 5, the drive wheel 8 and the starting pulley 11 from coming off.

The starting pulley 1 of the drive wheel 8
On the side surface facing No. 1, there is formed a concave portion which is open in one direction, and the concave portion constitutes a power storage means.
A mainspring housing portion 15 for housing 4 is configured. A mainspring case 16 accommodating the mainspring 14 is mounted inside from the side surface of the mainspring accommodating portion 15 of the drive wheel 8 which is open. It is held, and the inner peripheral end of the mainspring 14 is held by the starting pulley 11.

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 at once by the rotational force stored in the mainspring 14, and the engine is started via the centrifugal clutch mechanism 29. Be done

Between the outer peripheral surface of the drive wheel 8 and the case 2, there is formed a one-way rotation mechanism 17 that allows the drive wheel 8 to rotate only in the engine starting direction. Engaging teeth 18 formed on the outer peripheral surface of the drive wheel 8 and a swinging pawl 1 that is engaged with and disengaged from the engaging teeth 18.
It is composed of 9. When the drive wheel 8 is rotated in the direction to start the engine by the rotation of the rope reel 5, the swing claw 19 is retracted to the case 2 side against the spring biasing force and is disengaged from the engaging teeth 18 to be driven. Although the rotation of the wheel 8 is allowed, the drive wheel 8 is driven by the mainspring 14 with the rotational force accumulated in the mainspring 14.
Is about to rotate in the direction opposite to the engine starting direction, the swing claw 19 engages with the engaging tooth 18 to prevent the drive wheel 8 from rotating in the opposite direction.

As shown in FIG. 4, the clutch mechanism 9 formed between the rope reel 5 and the drive wheel 8 is located on the side of the rope reel 5 facing the drive wheel 8 in the lateral direction of the drive wheel 8. Locking protrusion 20 formed to project
And an annular leaf spring 22 which is arranged between the rope reel 5 and the drive wheel and in which the locking claw piece 21 is integrally bent toward the rear side in the rotation direction. In the leaf spring 22, the concave portion 25 formed on the outer peripheral edge of the annular leaf spring 22 is engaged with the convex portion 26 formed near the outer peripheral edge of the side wall surface of the drive wheel 8 to rotate in the rotational direction. It is attached to the side surface of the drive wheel 8 so as to be integrated.

The locking projection 20 has a locking surface 23 facing the front side in the rotational direction for starting the engine and an inclined surface 24 facing the rear side, and extends along the circumferential direction on the side surface of the rope reel 5. 3 are dispersed and formed. The locking claw piece 21 is bent toward the locking projection 20 by cutting and raising a part of the annular leaf spring 22 on the inner peripheral edge side, and has a locking surface 23 of the locking projection 20 at the tip. An engagement end surface 27 is formed which faces in the direction opposite to the engine start rotation direction in which the engagement is performed, and a rear side of the engagement end surface 27 is formed as an inclined surface 28. Two locking claw pieces 21 are arranged in a distributed manner along the circumferential direction of the annular leaf spring 20.

Since the locking claw piece 21 is formed by forming a cut in a part of the leaf spring 22 and bending and deforming the cut portion toward the locking projection 20, the rope is usually elastically stretched. When the rope reel 5 is rotated in the engine starting rotation direction, the locking surface of the locking projection 20 is 23.
The rotation of the rope reel 5 is transmitted to the drive wheel 8 side by contacting the engagement end surface 27 of No. 1. Further, when the rope reel 5 rotates in the reverse direction, the locking projection 20 contacts the inclined surface 28 and displaces the locking claw piece 21 against the elastic force, so that the rope reel 5 rotates in the reverse direction. It acts so as not to be transmitted to the drive wheel 8.

The operation of the clutch mechanism 9 according to the above embodiment will be described. In the initial state, as shown in FIG. 5A, the locking claw piece 21 of the leaf spring 22 attached to the side surface of the drive wheel 8 is located inside the rotation locus of the locking projection 20 formed on the rope reel 5. It has been placed. When the rope reel 5 is rotated in the direction of arrow A by pulling the recoil rope 4, the locking surface 23 of the locking projection 20 of the rope reel is locked by the locking claw piece 21 as shown in FIG. 5B.
The drive wheel 8 is rotated in the direction of the arrow B by this contact with the engaging end surface 27, and the rotation of the drive wheel 8 is rotated by the power spring 14 which is the power storage means.

At this time, a locking projection 20 formed on the side surface of the rope reel 5 and a locking claw piece 21 formed on the leaf spring 22.
Since the number of is formed differently into an odd number and an even number,
The rotation angle of the rope reel 5 until any one of the locking projections 20 and one of the locking claw pieces 21 engage can be reduced, and the number of the locking projections 20 and the locking claw pieces 21 can be reduced. Even so, the amount of rotation of the rope reel 5 can be reduced, and the rotation of the rope reel 5 can be efficiently transmitted to the drive wheel 8 on the driven side.

When the rope reel 5 is rotated in the opposite direction by the rotational force stored in the spring 7 for recoil and the recoil rope 4 is wound up, the rope reel 5 moves in the arrow direction as shown in FIG. 5 (c). Rotating in the direction of C, the inclined surface 24 formed on the locking projection 20 has the locking claw piece 23 of the leaf spring 22.
Abutting the inclined surface 28 of the rope, and thereby the locking claw piece 21 is displaced toward the drive wheel 8 side against the elasticity and the reverse rotation of the rope reel 5 is not transmitted to the drive wheel 8.
Rotate the rope reel 5 in the opposite direction to move the recoil rope 4.
It is possible to rewind.

In the above embodiment, the leaf spring 22 is supported on the drive wheel 8 side and the locking projection 20 is formed on the rope reel 5 side. However, the locking claw piece 21 is formed on the rope reel 5 side. The leaf spring 22 described above may be attached to form the locking projection 20 on the side surface of the drive wheel 8 that can be engaged with the locking claw piece 21. Further, the numbers of the locking projections 20 and the locking claw pieces 21 are not limited to those in the above-described embodiment, and it is possible to form any number as long as it is an odd number and an even number.

[0022]

As described above, according to the clutch mechanism of the present invention, it is formed on one side wall surface between the side wall surfaces of the drive wheel connected to the rope reel and the force accumulating means and facing each other. A clutch mechanism comprising a locking projection having a stop surface and an inclined surface and a leaf spring attached to the other side wall surface and integrally formed with a locking claw piece engageable with the locking surface is formed. Therefore, only a thin leaf spring is placed between the rope reel and the drive wheel, and it is not necessary to place parts that constitute the conventional clutch mechanism such as the clutch pawl member and clutch spring, and the external shape of the recoil starter is improved. The shape, especially the dimension along the rotation axis direction, can be made small and small.

According to the second aspect of the present invention, the number of the locking projections formed on one side wall surface and the number of the locking claw pieces formed on the leaf spring are different depending on whether one is even and the other is odd. Since it is formed by each, the rotation angle of the play of the rope reel can be made small and the rotation can be transmitted efficiently even if the number of locking projections and locking claw pieces is reduced, and the shape of parts Since it can be simplified, the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a recoil starter implementing a clutch 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 perspective view of a member forming a clutch mechanism.

5A and 5B are cross-sectional views showing an operating state of a locking projection and a locking claw piece of the clutch mechanism, in which FIG. 5A is an initial state, and FIG. The state in which the locking claw piece is engaged, (c) shows the state in which the rope reel is rotated in the opposite direction and the locking projection is separated from the locking claw piece.

FIG. 6 is a sectional view of a recoil starter implementing a conventional clutch mechanism.

[Explanation of symbols]

1 recoil starter 2 cases 5 rope reel 8 drive wheels 9 Clutch mechanism 14 Power storage means (spring) 20 Locking protrusion 21 Locking claw piece 22 leaf spring 23 Locking surface 24 inclined surface 25 recess 26 convex 27 Engaging end face 28 Inclined surface

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

Claims (2)

[Claims] 1. A rotational force of a drive unit having a rope reel that is rotationally driven by pulling a recoil rope is transmitted via a clutch mechanism to a power storage unit arranged on the engine side to the power storage unit. In the recoil starter configured to start the engine by the rotational force stored in the power storage means, a clutch mechanism formed between the drive unit and the power storage means includes a rope reel and a storage mechanism. Between the opposing side wall surfaces of the drive wheel connected to the force means, a locking protrusion formed on one side wall surface and having a locking surface and an inclined surface, and the other side wall surface mounted and locked. The locking claw piece engageable with the surface is composed of a plate spring integrally formed, and by engaging and disengaging the locking projection and the locking claw piece, the rotation of the rope reel is saved. Engine start on the means side Recoil starter, characterized in that the rotate transmitted only in the direction of rotation. 2. The locking projections formed on the one side wall surface and the locking claw pieces formed on the leaf spring are formed in different numbers, one of which is an even number and the other of which is an odd number. The recoil starter according to claim 1, which is characterized in that.