JPH075251Y2 - Recoil starter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a recoil starter for an internal combustion engine.

(Prior Art) Generally, this type of recoil starter includes a rope that can be pulled out and wound up freely, and a series of mechanisms that consist of a reel that is rewound by a mainspring and a ratchet that can be retracted and retracted through a restraint plate in a case. A ratchet is engaged with and driven by a starting pulley that is housed and directly connected to the engine. However, in the recoil starter having the above-described configuration, when the engine vibration is applied to the recoil starter, the restraint plate rotates to cause the ratchet to fly out during operation.

Therefore, the applicant proposed a recoil starter such as described in Japanese Utility Model Publication No. 61-125670, which prevents the ratchet from unintentionally protruding due to vibration or other reasons during engine operation.

In this recoil starter, the reel is rotated by pulling a rope, and the pin 7 of the ratchet 6 loosely inserted in the reel as shown in FIG. Arc-shaped wall 8b around the starter shaft to prevent ratchet popping out
Guided by, the ratchet 6 projects, meshes with the recess 11a of the starter pulley 11, rotates in the direction of the arrow, and starts the engine.

(Problems to be Solved by the Invention) In the operation of the recoil starter described in the prior art, there is no problem in the state shown in FIG.
As shown in the figure, there may be a case where only one ratchet 6 meshes with the recess 11a of the starter pulley 11. in this case,
When the engine is heavy or when a large force such as Ketchin (reversed without overcoming top dead center) is applied, the pulley 11 is eccentric and the pin 7 of the ratchet 6 is in the groove portion of the ratchet guide 8 ( The guide portion 8a and the arcuate wall 8b) are displaced and interfere with each other. Therefore, there is a risk of damaging the pin 7 of the ratchet 6 and the ratchet guide 8.

Therefore, the present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a recoil starter in which the stability of the ratchet is improved.

(Means for Solving the Problem) In order to achieve the above object, the recoil starter according to the present invention is a recoil starter in which a rope is wound around a reel by utilizing the restoring force of a mainspring, and a plurality of pins are attached. The ratchet is rotatably mounted on a reel, and on the other hand, it is made of resin or the like and is a groove shape for guiding the pin of the ratchet to retract the ratchet, and a substantially radial guide part, A ratchet guide provided with an arc-shaped wall around the starter shaft portion for preventing projection of the ratchet in correspondence with the ratchet is constituted so as to frictionally rotate on the shaft portion, and the radial guide portion of the ratchet guide. The outlet groove portion is widened, and a thin step portion is provided in the widened portion so as to have the same shape as the conventional groove portion.

(Operation) In normal operation of the recoil starter, there is no problem when all ratchets project and mesh with the starter pulley, but depending on the timing, only one ratchet may mesh with the starter pulley. In this case, the pulley is eccentric and the ratchet pin is displaced from the groove part of the ratchet guide, and a large force is applied to the ratchet pin,
Since the widened step portion is thin, the ratchet pin rides on the step portion and the ratchet pin and the groove portion of the ratchet guide do not interfere with each other.

(Embodiment) FIG. 1 is a sectional view of a recoil starter of the present invention, FIG. 2 (a) is a view taken along the line AA of FIG. 1, and FIG. 2 (b) is the Z direction of FIG. 2 (a). FIG. In the figure, reference numeral 1 is a case of a recoil starter, and a shaft 2 is fixed to the inside thereof, and a reel 3 is rotatably attached to the shaft 2. A concave portion 3a for accommodating the rope 4 is provided on the outer peripheral portion of the reel 3, and after the rope 4 is pulled out between the reel 3 and the case 1, when the hand is separated from the rope 4, the rope 4 is again reel 53. Unwinding spring 5 to be housed in the recess 3a of the
Is provided. A plurality of ratchets 6 are mounted on the surface of the reel 3, and the shaft portion 6a at one end thereof is mounted on the reel 3
It is pivotally attached to a hole provided in the and can be rotated. The pin 7 is provided in the middle of the ratchet 6. Numeral 8 is a circular ratchet guide that engages with the pin 7, and is made of resin or the like, the center of which is rotatably supported by a shaft screw 10 screwed to the starter shaft 2, and the pin 7 is guided on the outer periphery. And a substantially radial guide portion 8a in the shape of a groove for projecting and retracting the tip of the ratchet 6, and an arc-shaped wall around the substantially starter shaft 2 that follows the guide portion 8a for preventing the ratchet from projecting.
8b is provided and the pin 7 of the ratchet 6 is usually an arcuate wall 8b
Is engaged with the inner end of the. This ratchet guide 8 has a shaft 2
The friction spring 9 interposed between the two is pressed and held by the shaft screw 10 to prevent its rotation. On the other hand, a starter pulley 11 that is connected to the engine is provided on the engine side, and a plurality of recesses 11a (see FIG. 2A) are formed on the outer peripheral portion of the starter pulley 11. The configuration so far is almost the same as the conventional one, but in the present invention, only one ratchet is used as the starter pulley 11 depending on the timing during operation.
If they do not mesh with each other, the pulley 11 is eccentric and ratchet 6
Pin 7 is the groove of the ratchet guide 8 (radial guide
8a) causes offset interference. In order to eliminate such interference, the outlet groove portion of the radial guide portion 8a of the ratchet guide 8 is widened, and a thin stepped portion 12 (see FIG. 2) is formed in the widened portion so as to have the same shape as the groove portion of the conventional guide portion 8a. (See the hatched portion in (a)).

Next, the operation will be described.

First, when the rope 4 is pulled from the stationary state (the pin 7 is engaged with the inner end of the arcuate wall 8b), the reel 3 rotates in the arrow L direction (see FIG. 2 (a)). When the reel 3 rotates, the ratchet 6 also revolves at the same time. In this case, the pin 7 advances along the arcuate wall 8b while the ratchet guide 8 remains stopped by the friction spring 9 (see FIG. 1). Then, as shown in FIG. 2A, when the pin 7 enters the radial guide portion 8a, the pin 7 moves outward along one wall of the guide portion 8a. As a result, the ratchet 6 rotates, the tip portion thereof projects outward, and the ratchet 6 rotates while engaging with the concave portion 11a of the pulley 11 to start the engine. In this case, the ratchet guide 8 also rotates.

However, depending on the timing during operation, as shown in FIG. 3 (a), only one ratchet 6 is used for the starter pulley 11
It may not mesh with. At this time, the engine is heavy,
Alternatively, when a large force such as a ketchin is applied, the pulley 11 is eccentric, and the pin 7 of the ratchet 6 and the groove of the ratchet guide 8 interfere with each other, the step 12 is thin, so the pin 7 rides on the step 12 and Interference can be prevented.

After the engine is started, when the rope 4 is released, the reel 3 is reversely rotated by the mainspring 5 as in the conventional case, the ratchet guide 8 is also reversely rotated, and is returned when the reel 3 is stopped.

(Effects of the Invention) As described in detail above, according to the present invention, even if the ratchet pin is engaged during starting, and the ratchet pin shifts from the groove portion of the ratchet guide and interferes, the ratchet pin remains Since it only rides on the stepped portion, there is no damage to the pin or ratchet guide, the ratchet is evenly projected, and there is an effect such that it smoothly meshes with the pulley.

[Brief description of drawings]

1 is a sectional view of a recoil starter of the present invention, FIG. 2 (a) is a view taken along the line AA of FIG. 1, FIG. 2 (b) is a view taken in the Z direction of FIG. 2 (a), Ratchet is 1 in Fig. 3 (a)
Only the book is in engagement with the pulley, and Fig. 3 (b) shows the third
FIG. 4A is a partial view of the conventional recoil starter viewed from the pulley side, and FIG. 5 is a state diagram in which only one ratchet meshes with the pulley. 1 ... Starter case, 2 ... Axis, 3 ... Reel, 4 ...
… Rope, 5 …… spring, 6 …… ratchet, 7 ……
Pin, 8 ... Ratchet guide, 8a ... Radial guide part, 8b ... Arc wall, 9 ... Friction spring, 10
…… Shaft screw, 11 …… Starter pulley, 12 …… Step section

Claims (1)

[Scope of utility model registration request] 1. In a recoil starter in which a rope is wound around a reel by utilizing the restoring force of a mainspring, a plurality of ratchets having pins attached are rotatably mounted on the reel, while made of resin or the like. The ratchet has a groove-shaped and substantially radial guide portion for guiding the ratchet pin to move the ratchet in and out, and an arc-shaped wall subsequent to the guide portion, which is substantially centered around the starter shaft portion, for preventing ratchet ejection. The ratchet guide provided so as to correspond to the above is configured to be frictionally rotated by the shaft portion, and the outlet groove portion of the radial guide portion of the ratchet guide is widened, and the widened portion is shallower than the groove depth of the guide portion. A recoil starter having a step portion.