JP3813888B2 - Recoil starter device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recoil starter device used in an internal combustion engine, and more specifically, a one-way clutch is attached to a crankshaft of a small-sized internal combustion engine for a radio control or the like, and an internal combustion is performed by non-rotatable fitting between the one-way clutch and a reel bearing hole. The present invention relates to an improvement in a recoil starter device of a type to be mounted on an engine, and more specifically to an improvement in a structure for attaching a reel for a recoil rope to a starter case.
[0002]
The present invention includes a one-way bearing in the one-way clutch.
[0003]
[Prior art]
2. Description of the Related Art Conventionally, as a recoil starter device for this type of small-sized internal combustion engine for a radio control, for example, one having the following configuration is known.
[0004]
A recoil having a pair of rods 3 and 4 forming a rope groove 5 on the outer periphery of both ends of a cylindrical bearing portion 2 having a hexagonal shaft hole 1 and a spring winding shaft 27 integrally provided at one end of the center. The rope reel 6 is made of a hard synthetic resin material, and a rope passage hole 7 is formed in one of the hooks 3 and the base end portion of the recoil rope 8 is inserted into this, and the side wall of the rope groove 5 at the base end portion is inserted. A knot ball 9 having a diameter larger than the diameter of the rope passage hole 7 is provided at a location existing outside so that it cannot be removed, and the recoil rope 8 is fitted in the rope groove 5 and a spring chamber is formed on the outer surface of the reel 6 for the recoil rope. 22 is provided. After the recoil spring 23 is inserted into the spring chamber 22 in such a direction that the recoil spring 23 is applied to the recoil rope 8 so as to apply a return force, the reel 6 is inserted into the starter case 16, Spring at the end A blocking member 28 for locking the inner end of the recoil spring 23 to the spring take-up shaft 27 provided on the starter case 16 and preventing the reel 6 from being pulled out on the opening surface of the starter case 16, A form in which the blocking member 28 is attached so as to block and obstruct part of the opening surface.
[0005]
[Problems to be solved by the invention]
The recoil starter device of the type described in the prior art has the following problems due to the configuration as described above. That is,
a. Although the blocking member 28 only functions for transporting parts before being attached to the engine, it is necessary and the number of parts as a whole is large.
b. Since the blocking member 28 is provided, the number of processes is increased and it is difficult to assemble / disassemble.
c. The blocking member 28 comes off and does what is called a bad thing.
d. Because of the large number of parts, it is not suitable for cost reduction.
e. The recoil rope reel 6 is guided by the peripheral wall of the spring chamber 22 and rotates. The reel 6 does not have a shaft bar at the center of rotation and is not stable.
[0006]
An object of the present invention is to provide a novel recoil starter device that has been devised to solve the above problems and other contrivances.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a power accumulation type starter device according to the present invention has a one-way clutch attached to a crankshaft of an internal combustion engine, this one-way clutch is connected to a recoil rope reel, and the recoil rope reel is rotated. In a recoil starter device for starting an internal combustion engine, a center shaft protrudes from the reel for the recoil rope, a stop portion is provided at the tip of the center shaft, and a starter case that can be attached to the engine side is provided. A center hole is formed at the center position of the ceiling surface of the case, and the center shaft is pushed into the center hole, and the retaining portion is rotatably locked in the hole.
[0008]
The center shaft has a slit, and the tip has a triangular projection-shaped retaining portion with an umbrella shape or a slope that becomes thinner toward the tip, and the center hole has a shaft diameter of the center shaft. The hole is larger and smaller than the maximum diameter portion of the retaining portion.
[0009]
Furthermore, a spring chamber is provided in the top surface portion of the starter case, and a recoil spring is inserted into the spring chamber, and an inner end hook of the recoil spring is engaged with a slit of the center shaft.
[0010]
【Example】
In the embodiment shown in the figure, a recoil rope reel 6 is integrally provided with a pair of flanges 3 and 4 forming a rope groove 5 on the outer periphery of both ends of a cylindrical bearing portion 2 having a hexagonal shaft hole 1. It is composed of a hard synthetic resin material having a slight elasticity, and a rope through hole 7 is opened in one of the ridges 3 and the base end portion of the recoil rope 8 is inserted into this, and the side wall of the rope groove 5 at the base end portion A knot ball 9 having a diameter larger than the diameter of the rope passage hole 7 is provided at a location existing outside the rope so that it cannot be removed, and the recoil rope 8 is secured in the rope groove 5.
[0011]
Further, a short tubular spring winding shaft / center shaft 11 is integrally projected on the outer end surface of the bearing portion 2, and one or more of the spring winding shaft / center shaft 11 is formed on the outer end edge surface of the spring winding shaft / center shaft 11. A deep slit 12 is cut to reduce the diameter, and an umbrella-shaped retaining portion 13 that is tapered toward the tip of the spring winding shaft / center shaft 11 is integrally projected.
[0012]
Separately from this, a dish-shaped starter case 16 having a mounting hole 15 for the engine-side fan case 14 at the opening edge is formed of a hard synthetic resin material, and the starter case 16 is formed at the center of the ceiling surface 17. A center hole 19 that is larger than the outer peripheral diameter of the spring winding shaft / center shaft 11 and smaller than the outer peripheral diameter of the umbrella-shaped locking portion 13 is opened, and a step portion is provided near the ceiling surface 17 on the outer peripheral wall 20 of the starter case 16. 21 is provided, and a spring chamber 22 is provided. A recoil spring 23 is inserted into the spring chamber 22 in a direction in which the recoil spring 23 applies a return force to the recoil rope 8, and the recoil spring 23 is wound in this inserted state. The spring take-up shaft / center shaft 11 is pushed into the center hole 19 through the center space portion 24 from the inside to the outside. The outer peripheral edge portion 25 of the one in which engaged the incisal portion outer face of the center hole 19.
[0013]
In the embodiment, the one-way clutch 32 is attached to the crankshaft 31 of the internal combustion engine, and the recoil rope reel 6 is attached to the crankshaft by the non-rotatable fitting between the one-way clutch 32 and the bearing hole 1 of the recoil rope reel 6. 31 is used by attaching.
[0014]
In the drawing, although the drawing holes of the recoil rope 8 and the hook portions at the outer ends of the recoil spring 23 are not shown, the drawing holes are formed at the outer peripheral wall 20 of the starter case 16 and at the inner and outer ends of the coil spring 23. The hook portion is provided on the bearing portion 2 and the starter case 12.
[0015]
In the embodiment, a spring chamber 22 is provided in the top surface portion 17 of the starter case 16, and a recoil spring 23 is inserted into the spring chamber 22, and an inner end hook (not shown) of the recoil spring 23 is inserted into the spring chamber 22. Is fixed to the slot 12 of the center shaft 11, a spring chamber is provided on the outer surface of the reel, and a recoil spring is inserted into the spring chamber, and the outer end of the recoil spring 23 is connected to the outer periphery of the spring chamber. It is also possible to adopt a configuration in which the inner ends of the recoil springs are respectively locked to the starter case.
[0016]
【The invention's effect】
As described above, the recoil starter device according to the first aspect attaches a one-way clutch to the crankshaft of the internal combustion engine, connects the one-way clutch to the recoil rope reel, and rotates the recoil rope reel to rotate the internal combustion engine. In the recoil starter device to be started, a center shaft protrudes from the reel for the recoil rope, a stop portion is provided at the tip of the center shaft, and a starter case that can be attached to the engine side is provided. Since the center hole is opened at the center position of the surface, the center shaft is pushed into the center hole, and the retaining portion is rotatably locked in the hole, so that the conventional example has It does not have the blocking member 28, and can solve the problems such as a to d. In addition, the center shaft in the present invention has a function of eliminating the blocking member 28, a function of attaching a recoil rope reel to the starter case, a function of winding a recoil spring, and a rotation center of the reel of the recoil rope. The function of the shaft and the function of improving the rotation stability of the reel for the recoil rope can be achieved with a single product, and the construction can be simplified. The effect is extremely great. .
[0017]
Further, in the recoil starter device according to claim 2, the center shaft has a slit and has a triangular projection-shaped retaining portion with an umbrella shape that becomes thinner toward the tip or a slope that becomes lower toward the tip. Also, since the center hole is larger than the shaft diameter of the center shaft and smaller than the maximum diameter portion of the retaining portion, the recoil rope reel can be easily attached to the starter case by pushing the center shaft into the center hole. It can be carried out speedily by work, and is suitable for improving production efficiency.
[0018]
Further, the recoil starter device according to claim 3 is provided with a spring chamber in the top surface portion of the starter case, and the recoil spring is inserted into the spring chamber, and the inner end hook of the recoil spring is locked in the slit of the center shaft in the spring chamber. Therefore, the slit of the center shaft fulfills the locking function of the inner end hook of the recoil spring in addition to the diameter reducing function that allows the retaining portion of the center shaft to come out of the center hole. Therefore, it is extremely preferable for simplification of the configuration.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIG. 2 is an exploded sectional view of the same.
FIG. 3 is a cross-sectional view showing a conventional example.
[Explanation of symbols]
1 Shaft hole 2 Bearing member 3 鍔 4 鍔 5 Rope groove 6 Reel 7 Rope through hole 8 Recoil rope 9 Knotting ball 11 Spring take-up shaft and center shaft 12 Slot 13 Detachment point 14 Fan case 15 Mounting hole 16 Starter case 17 Ceiling surface 19 Center hole 20 Outer peripheral wall 21 Step part 22 Spring chamber 23 Recoil spring 24 Central space part 25 Outer peripheral edge part 27 Winding shaft 28 Blocking member 31 Crank shaft 32 One-way clutch

Claims (3)

In a recoil starter device for attaching a one-way clutch to a crankshaft of an internal combustion engine, connecting the one-way clutch to a recoil rope reel, and starting the internal combustion engine by rotating the recoil rope reel, a center shaft is mounted on the recoil rope reel. And a starter case that can be attached to the engine side. A center hole is opened at the center of the ceiling surface of the starter case. A recoil starter device, wherein the center shaft is pushed in and the retaining portion is rotatably locked in the hole. The center shaft has a slit and has a triangular projection-shaped retaining portion with an umbrella shape or a slope that becomes narrower toward the tip at the tip, and the center hole is smaller than the shaft diameter of the center shaft. 2. The recoil starter device according to claim 1, wherein the hole is a hole that is largely smaller than a maximum diameter portion of the retaining portion. 3. A recoil starter device according to claim 2, wherein a spring chamber is provided in the top surface portion of the starter case, a recoil spring is inserted into the spring chamber, and an inner end hook of the recoil spring is engaged with a slit of the center shaft. .

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