JP3892771B2 - Recoil starter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention rotates a rope reel by pulling a recoil rope wound around a rope reel, stores the rotation of the rope reel in a power storage means, and cams the rotational force stored in the power storage means. And a recoil starter that starts the engine by rotating the output shaft of the engine via a one-way rotating mechanism formed between the cam and the output shaft.
[0002]
[Prior art]
A rope reel wound with a recoil rope and a drive wheel that is rotated by the rope reel via a one-way clutch, and connected to the drive wheel and the crankshaft side of the engine via a one-way rotation mechanism such as a centrifugal clutch mechanism There is already known a livestock type recoil starter in which a cam is connected by a power storage means composed of a spring. This recoil starter rotates the drive wheel via the one-way clutch to rotate the rope reel that is rotated by pulling the recoil rope. The engine is started by rotating the cam by the rotational force stored in the force means. The drive wheel is formed with a ratchet mechanism for preventing the drive wheel from rotating in the reverse direction due to the rotational force stored in the power storage means.
[0003]
The recoil starter is integrally formed with a reel spindle that protrudes from the bottom of the starter case that is open at one end to face the output shaft of the engine, and the reel spindle includes a rope reel, a drive wheel, a cam, and the like. The component is configured to be rotatably held, and the member is prevented from coming off in the axial direction by a screw screwed to the end of the reel spindle. The starter case is configured to be assembled to the case on the engine side so that the open portion of the starter case faces the flywheel magnet or drive pulley attached to the output shaft of the engine.
[0004]
[Problems to be solved by the invention]
In the above-described prior art recoil starter, the end of the reel support shaft formed in the starter case is formed with a stopper such as a drive wheel, and the starter case is installed in the engine so as to accommodate the flywheel magnet attached to the engine output shaft. Since it is assembled, it becomes impossible to connect an operating device driven by the engine to the output shaft on which the recoil starter is assembled. In a small engine with a cantilever output shaft, the engine output shaft is disposed only on one side of the engine. Therefore, when a drive shaft such as a brush cutter is connected to this output shaft, the recoil There was a problem that the starter could not be installed.
[0005]
The present invention solves the above-mentioned problems of the prior art, and even in a cantilever type engine, an operating device driven by the engine on the same output shaft in a state where a recoil starter is assembled on one output shaft. It is an object to provide a recoil starter that can be connected.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a recoil starter according to the present invention includes a rope reel in which a recoil rope is wound and urged to rotate in a winding direction of the recoil rope, and a rotary reel connected to the rope reel via a one-way clutch. A drive wheel that is allowed to rotate only in one direction by the ratchet mechanism, a cam that transmits the rotation to the engine output shaft via the one-way rotation mechanism, and a drive wheel that is interposed between the drive wheel and the cam. And a power storage means for storing the rotational force of the drive wheel, the rotation of the drive wheel rotated by the rope reel is stored in the power storage means, and the rotation stored in the power storage means is stored. in the recoil starter which is adapted to rotate the output shaft of the engine of the operating device via a one-way rotation mechanism rotates the cam by the force A reel support shaft is integrally formed from the inside of the starter case formed so as to cover the side surface of the engine on which the output shaft is disposed, toward the output shaft of the engine, and the rope reel, the drive wheel, and A cam is rotatably supported, and an opening penetrating from the engine output shaft to the outside of the starter case is formed at the center of the reel support shaft, and the engine output shaft is formed inside the starter case through the opening. A ratchet mechanism is provided between the starter case and the drive wheel so as to allow connection to the drive shaft on the operating device side, and allows the drive wheel to rotate only in the engine starting direction. Engagement teeth formed on the outer periphery of the wheel and slidable on a support shaft formed on the starter case so as to be engageable with the engagement teeth Characterized in that it is constituted by a lifting been ratchet member.
[0007]
The invention according to claim 2 is characterized in that the livestock means arranged between the drive wheel and the cam is constituted by a spring having one end engaged with the drive wheel and the other end engaged with the cam. .
[ 0008 ]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings. As shown in FIG. 1, the main mechanism of the recoil starter is constructed by being assembled in a starter case 1 formed so as to be attached to one side where the output shaft C of the engine E is disposed. The starter case 1 is integrally formed with a reel support shaft 2 projecting from the inner wall surface of the starter case 1 toward the output shaft C so as to face the output shaft C of the engine E, and one end thereof is formed. A rope reel 4 around which the recoil rope 3 drawn out of the starter case 1 is wound is rotatably supported by the reel support shaft 2, and one end side of the recoil rope 3 is fixed to the rope reel 4 and the other end is fixed. It is drawn out and arranged outside the starter case 1. By pulling the handle coupled to the end of the recoil rope 3, the recoil rope 3 is pulled out from the rope reel 4 and the rope reel 4 is driven to rotate about the reel support shaft 2.
[ 0009 ]
A recoil spring 5 is disposed on the side surface of the rope reel 4 for rotating the rope reel 4 rotated by pulling the recoil rope 3 in the reverse direction and rewinding the drawn recoil rope 3 back to the rope reel 4. ing. One end of the recoil spring 5 is fixed to the starter case 1 and the other end of the outer periphery is fixed to the rope reel 4. When the rope reel 4 is rotated by pulling the recoil rope 3. The rotational force is accumulated in the recoil spring 5 (see FIG. 6), and the rope reel 4 is moved in the reverse direction by the rotational force accumulated in the recoil spring 5 by opening the recoil rope 3 or loosening the pulling force. It operates to rotate and rewind the recoil rope 3 onto the rope reel 4.
[ 0010 ]
A drive wheel 6 is rotatably supported on the reel support shaft 2 formed on the starter case 1 so as to be adjacent to the rope reel 4, and a rope is interposed between the rope reel 4 and the drive wheel 6. A one-way clutch 7 for transmitting the rotation of the reel 4 in the engine starting direction to the drive wheel 6 is formed. The one-way clutch 7 accommodates a clutch member 8 in a recess formed on a side surface of the rope reel 4 facing the drive wheel 6 and urges the clutch member 8 toward the drive wheel 6 by a spring 9. A concave portion 10 that can be engaged with the clutch member 8 is formed on the side surface of the drive wheel 6 facing the clutch member 8. The rope reel 4 side when the recoil rope 4 is pulled by the one-way clutch 7. Is transmitted to the drive wheel 6, and when the recoil rope 3 is wound around the rope reel 4 in the reverse direction, the transmission is interrupted so that the reverse rotational force is not transmitted to the drive wheel 6.
[ 0011 ]
Further, a cam 11 for transmitting the rotation to the output shaft C side on the engine E side is rotatably supported on the reel support shaft 2, and as shown in FIG. A centrifugal clutch mechanism 13, which is a one-way rotation mechanism that transmits the rotation of the cam 11 in the engine start rotation direction to the flywheel magnet 12, is formed between the integrally connected flywheel magnets 12. The centrifugal clutch mechanism 13 includes a centrifugal ratchet 14 that is formed on the flywheel magnet 12 and is rotated by centrifugal force, and a cam claw 15 that is formed in the circumferential direction of the cam 11 and that engages and disengages the centrifugal ratchet 14. The cam claw 15 engages with the centrifugal ratchet 14 of the flywheel magnet 12 to transmit the rotation on the cam 11 side to the output shaft C of the engine E. After the engine E is started, the flywheel magnet 12 is rotated by the engine E, so that the centrifugal ratchet 14 is rotated in a direction away from the cam pawl 15 by centrifugal force, and the engine E side and the cam 11 side are rotated. The rotation transmission is cut off.
[ 0012 ]
A concave portion 16 opened in one side direction is formed on a side surface facing the cam 11 of the drive wheel 6, and a spring 17 constituting a power storage means is accommodated in the concave portion 16. As shown in FIG. 5, the outer peripheral side end of the mainspring 17 is held by the drive wheel 6, and the inner peripheral side end of the mainspring 17 is held by the cam 11. In this way, the drive wheel 6 and the cam 11 are rotationally coupled via the spring 17, and the cam 11 is rotated via the spring 17 when the drive wheel 6 rotates via the rope reel 4. When the load on the side is large and the rotation of the cam 11 is prevented, the mainspring 17 is wound by the drive wheel 6 that is rotated via the rope reel 4, and the rotational force is stored in the mainspring 17.
[ 0013 ]
A ratchet mechanism 18 that allows the drive wheel 6 to rotate only in the engine starting direction is formed between the drive wheel 6 and the starter case 1, and the ratchet mechanism 18 is formed on the outer peripheral side of the drive wheel 6. The engaging teeth 19 and the ratchet 20 engaged with and disengaged from the engaging teeth 19 are formed. The ratchet 20 is supported by being slidable in the axial direction with respect to the support shaft 21 formed on the starter case 1 and spring-biased in a direction to engage with the engaging teeth 19. When the drive wheel 6 is rotated in the direction to start the engine, the ratchet 20 is retracted in a direction to disengage from the engagement teeth 19 against the spring biasing force, and the engagement with the engagement teeth 19 is released. The rotation of the drive wheel 6 is allowed, but the ratchet 20 is engaged when the spring 17 tries to rotate the drive wheel 6 in the direction opposite to the engine starting direction with the rotational force stored in the spring 17. Engagement with the teeth 19 prevents the drive wheel 6 from rotating in the opposite direction.
[ 0014 ]
As shown in FIGS. 3 and 4, the starter case 1 is provided with a plate 22 attached by screws, and the plate 22 is formed in an annular shape with an opening 22a formed at the center thereof. The drive wheel 6 and the cam 11 that are rotatably supported by the reel support shaft 2 are engaged with the annular portion of the plate 22 so that the drive wheel 6 and the cam 11 move in the axial direction of the reel support shaft 2. The movement is restricted, and the drive wheel 6 and the cam 11 are prevented from coming out of the reel spindle 2.
[ 0015 ]
When the drive wheel 6 is rotated via the rope reel 4 that is rotated by pulling the recoil rope 3, the rotation is transmitted to the engine side via the spring 17, but the rotation of the cam 11 is prevented by the engine starting resistance. If this is done, the drive wheel 6 rotated via the rope reel 4 winds up the spring 17, and the rotational force is stored in the spring 17. When the accumulated power of the mainspring 17 exceeds the starting resistance of the engine acting on the cam 11, the cam 11 is rotated at a stroke by the rotational force accumulated in the mainspring 17 and the flywheel magnet 12 is moved via the centrifugal clutch mechanism 13. The engine is started by rotating.
[ 0016 ]
At the center of the reel support shaft 2 formed in the starter case 1, an opening 23 is formed on the extended line of the output shaft C of the engine E so as to penetrate to the outside of the starter case 1. A drive shaft D on the operating device side connected to the shaft C passes through the opening 23 of the reel support shaft 2 and can be connected inside the starter case 1. On the end side of the opening 23 of the starter case 1 is formed an opening 24 having a large inner diameter into which a pipe P supporting an operating mechanism such as a cutter part of a brush cutter is inserted. As shown, the operating device is connected to the engine portion via a starter case 1 in which a pipe P is fitted in the opening 24 and accommodates a recoil starter.
[ 0017 ]
A connecting shaft 27 is formed integrally with a nut member 25 that attaches and fixes the flywheel magnet 12 or drive pulley to the output shaft C of the engine E, and a through hole 26 having a square cross section is formed at the center. Is attached to the output shaft C of the engine E, and the connecting shaft 27 is inserted into the opening 23 at the center of the reel support shaft 2 formed in the starter case 1 with the nut member 25 screwed to the output shaft C. Be placed. A drive shaft D for driving a rotary cutter or the like of a brush cutter is disposed at the center of the pipe P. By inserting the end of the drive shaft D into the rectangular through hole 26 of the connecting shaft 27, The rotation of the output shaft C of the engine E is transmitted to the rotary cutter portion of the brush cutter through the connecting shaft 27.
[ 0018 ]
【The invention's effect】
As described above, according to the present invention, the opening that penetrates to the outside of the starter case along the axis of the output shaft of the engine is formed in the center portion of the reel spindle formed in the starter case, and the output shaft of the engine is A ratchet mechanism is provided between the starter case and the drive wheel, the ratchet mechanism allowing rotation of the drive wheel only in the engine starting direction. The reel includes an engaging tooth formed on the outer peripheral edge of the drive wheel and a ratchet member slidably supported on a support shaft formed on the starter case so as to be engageable with the engaging tooth. The rotational output of the engine output shaft is connected inside the starter case through the opening of the support shaft, and the rotational output of the engine is taken outside the starter case. Even in the case of a cantilever engine whose output shaft is formed only on one side, it is possible to arrange a recoil starter between the engine and the operating device driven by the engine. It becomes.
[Brief description of the drawings]
1 is a longitudinal side view of a recoil starter according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. FIG. 3 is an enlarged longitudinal side view of the same part of the recoil starter as in FIG. 4 is a side view of the main part of the same recoil starter as FIG. 3. FIG. 5 is a cross-sectional view taken along line BB in FIG. 3. FIG. 6 is a cross-sectional view taken along line CC in FIG.
DESCRIPTION OF SYMBOLS 1 Starter case 2 Reel spindle 4 Rope reel 5 Recoil spring 6 Drive wheel 7 One-way clutch 11 Cam 12 Flywheel magnet 13 Centrifugal clutch mechanism (one-way rotation mechanism)
17 Spring ( Power storage means )
18 Ratchet mechanism 22 Plate 23 Opening 24 Opening 25 Nut member 26 Through hole 27 Connecting shaft

Claims (2)

A rope reel that is wound around the recoil rope and urged to rotate in the winding direction of the recoil rope, and is rotationally connected to the rope reel via a one-way clutch and is allowed to rotate in only one direction by a ratchet mechanism. A drive wheel, a cam that transmits rotation to the output shaft of the engine via a one-way rotation mechanism, and a force storage means that is interposed between the drive wheel and the cam and stores the rotational force of the drive wheel. The rotation of the drive wheel rotated by the rope reel is stored in the power storage means, and the cam is rotated by the rotational force stored in the power storage means to rotate the one-way rotation mechanism. in the recoil starter which is adapted to rotate the output shaft of the engine of the operating device through, so as to cover the side surface of the engine that the output shaft is arranged A reel support shaft is integrally formed from the inside of the formed starter case toward the output shaft of the engine, and the reel support shaft rotatably supports the rope reel, the drive wheel, and the cam, and the reel support shaft. Forming an opening penetrating from the output shaft of the engine to the outside of the starter case in the center of the engine so that the output shaft of the engine can be connected to the drive shaft on the operating device side inside the starter case through the opening, A ratchet mechanism that allows the drive wheel to rotate only in the engine starting direction is provided between the starter case and the drive wheel, and the ratchet mechanism includes engagement teeth formed on the outer peripheral edge of the drive wheel, and the engagement It is composed of a ratchet member slidably supported on a support shaft formed on the starter case so as to be able to engage with the tooth. Recoil starter, characterized. 2. The power storage means arranged between the drive wheel and the cam is configured by a spring having one end engaged with the drive wheel and the other end engaged with the cam. Recoil starter.

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