JPH0250314B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recoil starter suitable for use in outboard motors and the like.

[Prior art] Conventionally, Utility Model Publication No. 48778, Utility Model Publication No. 1987-
As described in Publication No. 150030 and Publication No. 155027 of 1983, a recoil starter for an outboard motor, etc. has a reel that is rotatably supported by a starter case, and a reel that is wound around the reel and that is pulled out by pulling out the reel. A winding member that allows the reel to rotate in the forward direction, a mainspring that is interposed between the starter case and the reel and urges the reel in the reverse direction of winding the winding member, and a mainspring that is rotatably supported on the side of the reel. and a ratchet that is elastically supported around the reel support shaft of the starter case and that is capable of swinging between a protruding position where it engages with the starting pulley on the engine side and a retracted position where it does not engage with the starting pulley. When the reel rotates in the forward direction, the protruding operating surface of the ratchet is pushed by the protruding operating section to protrude the ratchet to the above-mentioned protruding position, and when the reel rotates in the reverse direction, the retracting operating section is brought into contact with the retracting operating surface of the ratchet and the ratchet is activated. An actuator for retracting the reel into the retracted position, and a stopper for supporting the ratchet, which is provided on the reel and is in engagement with the starting pulley, at the protruding position.

That is, in the conventional recoil starter described above, the winding member is pulled out against the mainspring, the reel is rotated in the forward direction, the ratchet is projected by the actuator, and the ratchet is engaged with the groove of the starting pulley on the engine side. The engine can be started by
After the engine is started, the reel is reversely rotated by the action of the mainspring, the winding member is wound onto the reel, and the ratchet is retracted by the actuator.

[Problems to be Solved by the Invention] However, in the conventional recoil starter described above, the retraction operation surface of the ratchet forms an arc centered on the opposite side of the ratchet support shaft with respect to the reel support shaft when the ratchet is in the retracted state. ing. Therefore, when the ratchet is in the retracted state, the contact force generated between the retractable operating surface of the ratchet and the retractable operating part of the actuator is directed toward the side opposite to the ratchet support shaft with respect to the reel support shaft, and is caused by engine vibration. When the above-mentioned contact force becomes large, the actuator rotates around the reel support shaft in a direction in which its retractable operating portion releases contact with the retractable operating surface of the ratchet, and the ratchet is returned to its retracted position. Therefore, it may be difficult to maintain stable operation of the recoil starter.

In addition, in the conventional recoil starter described above, the stopper that supports the ratchet in the protruding position is arranged so that the engagement surface of the ratchet with respect to the starting pulley is
The ratchet supports the side opposite to the support shaft, and the ratchet transmits the activation load acting on its engagement surface to the stopper while increasing the lever ratio, thereby exerting a large surface pressure on the stopper. Furthermore, since the starting load exerted on the ratchet by the starting pulley and the support load exerted on the ratchet by the stopper are in approximately the same direction, the ratchet support shaft has a large surface pressure sufficient to counteract both loads. act. Therefore, in recoil starters used for outboard motors, for example, the stopper and ratchet support shaft may be made of resin or protected by a resin bushing to prevent salt build-up from seawater. There is a risk of damage to the stopper and the ratchet support shaft due to surface pressure.

The present invention prevents the ratchet from jumping out of the retracted position due to engine vibration, and can reduce the surface pressure acting on the stopper that supports the ratchet in the extended position and the surface pressure acting on the ratchet support shaft against the starting load. The purpose of the present invention is to provide a recoil starter that achieves the following.

[Means for Solving the Problems] In order to achieve the above object, the recoil starter according to the present invention is such that the retraction operation surface of the ratchet forms an arc centered on the reel support shaft when the ratchet is in the retracted state. In addition, the stopper supports the rear side of the engaging surface of the ratchet with respect to the starting pulley.

[Operation] Therefore, when the ratchet is in the retracted state, the contact force generated between the retractable operating surface of the ratchet and the retractable operating part of the actuator is directed toward the reel support shaft, and the contact force is directed toward the reel support shaft, and the contact force is directed toward the reel support shaft. Even when the force is large, the actuator maintains contact with the ratchet without rotating around the reel support axis, stably holding the ratchet in the retracted position and preventing it from popping out. becomes. Furthermore, since the ratchet allows the stopper to support the activation load acting on its engagement surface without being increased by the lever ratio, surface pressure acting on the stopper can be reduced. Furthermore, the starting load exerted on the ratchet by the starting pulley and the supporting load exerted on the ratchet by the stopper are substantially opposite to each other and have substantially the same magnitude, so there is almost no load acting on the ratchet support shaft. The surface pressure acting on the ratchet support shaft can be reduced.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a bottom view showing a recoil starter 10 according to an embodiment of the present invention, and FIG. 2 is a bottom view of a recoil starter 10 according to an embodiment of the invention.
It is a sectional view along a line.

The starter case 11 is fixed, for example, to the upper part of the main body of an outboard motor engine. A reel support shaft 12 is erected in the center of the starter case 11, and a reel 13 is rotatably supported on the reel support shaft 12. In the winding groove 14 on the outer periphery of the reel 13,
A rope 15 serving as a wrapping member in the present invention is wound around. A starter knob 16 is connected to the pulling end of the rope 15, and the starter knob 16 is
By pulling out the rope 15, the reel 13 can be rotated in the forward direction.

A mainspring 17 is interposed between the starter case 11 and the reel 13, and the mainspring 17 is connected to the rope 1.
The reel 13 is urged in the reverse rotation direction to wind up the reel 5. On the side of the reel 13, the reel support shaft 1
A ratchet support shaft 18 is installed offset from the ratchet 19.
is rotatably supported approximately at its center. The ratchet 19 has its engagement surface 20 shown in solid line in FIG.
The retracted position in which the engine does not engage with the engagement groove 22 of the starting pulley 21 on the engine side, and the retracted position shown by the two-dot chain line in FIG.
The engaging surface 20 is capable of swinging between a protruding position where it engages with an engaging groove 22 of the starting pulley 21. In its protruding position, the ratchet 19
It comes into contact with a stopper 23 formed on the reel 13, and can be supported in its protruding position under the above-described engagement state with the starting pulley 21.

At the tip of the reel support shaft 12, a reel 13, a mainspring 17, and a ratchet 1 are attached to the reel support shaft 12.
The holding plate 24 that can hold the fixing bolt 25
integrated by. The boss portion 26 of the restraining plate 24 is provided with a spring 2 as an actuator in the present invention.
7 is supported by oppression. The spring 27 has a substantially U-shape, and elastically clamps the boss portion 26 by opposing recesses 28 in its middle portion, with its head serving as a protruding actuating portion 29 and bent approximately at right angles. The free end is used as a retraction actuation section 30. Spring 2
When the reel 13 rotates forward, the protruding actuating portion 29 of 7 pushes the protruding actuating surface 31 of the ratchet 19 to make it possible to protrude the ratchet 19 to the protruding position. Further, the retractable actuating portion 30 of the spring 27 causes the ratchet 1 to rotate when the reel 13 rotates in the reverse direction.
The ratchet 19 can be retracted into the retracted position by contacting the retractable operation surface 32 of the ratchet 9.

Here, in this embodiment, the ratchet 1
The retraction operation surface 32 of 9 can form a circular arc centered on the reel support shaft 12 when the ratchet 19 is retracted, as shown by the radius of curvature R in FIG. Also, the stopper 2 formed on the reel 13
3 is capable of supporting the rear surface 33 of the ratchet 19 against the engagement surface 20.

Next, the operation of the above embodiment will be explained.

When the rope 15 is pulled out by the starter knob 16, the reel 13 rotates forward in the direction shown by the arrow in FIG.
9 also rotates forward. On the other hand, the spring 27 which is elastically supported around the reel support shaft 12 remains stationary due to the frictional force with the boss portion 26 of the holding plate 24. Therefore, as the ratchet 19 rotates forward together with the reel 13, the protruding operating surface 31 of the ratchet 19 is pushed by the protruding operating portion 29 of the spring 27, and the third
It protrudes from the retracted position shown by the solid line in the figure to the protruded position shown by the two-dot chain line.

Furthermore, the rope 15 is controlled by the starter knob 16.
When the latch 19 is pulled out, the pull-out force of the rope 15 overcomes the frictional force between the spring 27 and the boss 26, and the spring 27 rotates forward together with the latch 19 while leaving the latch 19 protruding.
The engaging surface 20 of 9 engages with the engaging groove 22 of the starting pulley 21 to start the engine. At this time, the starting load _F1 generated between the engaging groove 22 of the starting pulley 21 and the engaging surface 20 of the ratchet 19 supports the back surface 33 against the engaging surface 20 of the ratchet 19, as shown in FIG. It is supported by a stopper 23.

When you let go of the starter knob 16, the mainspring 1
7 causes the reel 13 to rotate in the opposite direction, the rope 15 to be wound up, and at the same time the ratchet 19 to rotate in the opposite direction. At this time, the spring 27, which is elastically supported around the reel support shaft 12, remains stationary due to the frictional force with the boss portion 26. Therefore, Ratchet 1
As the reel 9 rotates in the opposite direction together with the reel 13, the retraction operating portion 30 of the spring 27 is brought into contact with its retraction operation surface 32, and the retractor 9 is retracted from the protruding position shown by the two-dot chain line to the retracting position shown by the solid line in FIG. .

Thereafter, the force of the mainspring 17 overcomes the frictional force generated between the spring 27 and the boss portion 26, and the spring 27 rotates in the opposite direction together with the ratchet 19 while keeping the ratchet 19 recessed, and the starter knob 16 is moved toward the starter case 11 side. All operations end at the point of collision.

According to the embodiment described above, when the ratchet 19 is in the retracted state, the contact force generated between the retraction operation surface 32 of the ratchet 19 and the retraction operation portion 30 of the spring 27 is as follows:
Even if the contact force becomes large due to engine vibration, the spring 27 does not rotate around the reel support shaft 12 and remains in contact with the ratchet 19. To stably hold the ratchet 19 in the retracted position and reliably prevent the ratchet 19 from jumping out of the retracted position due to engine vibration.

Further, since the ratchet 19 allows the stopper 23 to support the starting load _F1 acting on its engagement surface without being increased by the lever ratio, the surface pressure acting on the stopper 23 can be reduced. In addition, the starting load _F1 exerted by the engaging groove 22 of the starting pulley 21 on the engaging surface 20 of the ratchet 19,
The support load F ₂ exerted by the stopper 23 on the back surface 33 of the ratchet 19 is substantially opposite to each other and has approximately the same size as shown in FIG. 3, so that almost no load acts on the ratchet support shaft 18. Therefore, the surface pressure acting on the ratchet support shaft 18 can be reduced. Therefore, in a recoil starter used for an outboard motor, etc., the stopper 23 and the ratchet support shaft 1 are
Even when the stopper 23 and the ratchet support shaft 18 are protected by being made of resin or fitted with a resin bushing, there is no fear that the stopper 23 and the ratchet support shaft 18 will be damaged under the action of large surface pressure.

[Effects of the Invention] As described above, according to the present invention, the ratchet is prevented from popping out from the retracted position due to engine vibration, and the surface pressure acting on the stopper that supports the ratchet in the protruding position against the starting load is reduced. A recoil starter that can reduce the surface pressure acting on the ratchet support shaft can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a bottom view showing a recoil starter according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line - in Fig. 1, and Fig. 3 is an explanatory diagram showing the main parts of Fig. 1. It is. DESCRIPTION OF SYMBOLS 10... Recoil starter, 11... Starter case, 12... Reel support shaft, 13... Reel, 15...
Rope, 17...Spring, 18...Ratchet support shaft, 19...Ratchet, 20...Engagement surface, 21...Start pulley, 22...Engagement groove, 23...Stopper, 27
...Spring, 29...Protruding actuating part, 30... Retracting actuating part,
31... Protruding operating surface, 32... Retracting operating surface, 33... Back surface.

Claims (1)

[Claims] 1. A reel that is rotatably supported by a starter case, a winding member that is wound around the reel and allows the reel to rotate in the forward direction when the reel is pulled out, and a winding member that is interposed between the starter case and the reel and is wound around the reel. A mainspring that biases the reel in the opposite rotation direction to wind up the hanging member, and a spring that is rotatably supported on the side of the reel and has a protruding position where it engages with a starting pulley on the engine side and a retracted position where it does not engage with the starting pulley. The ratchet is elastically supported around the reel support shaft of the starter case, and when the reel rotates in the forward direction, its protruding operating portion pushes the protruding operating surface of the ratchet to move the ratchet to the above-mentioned protruding position. make it stand out,
The reel is provided with an actuator for retracting the ratchet into the retracting position by bringing its retracting operating portion into contact with the retracting operating surface of the ratchet when the reel rotates in reverse;
In a recoil starter comprising a stopper that supports the ratchet in the protruding position while engaged with the starting pulley, the retraction operating surface of the ratchet is centered around the reel support shaft when the ratchet is in the retracted state. The recoil starter is characterized in that the stopper supports the rear side of the engagement surface of the ratchet with respect to the starting pulley.