JPS6224048Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a starter device for an internal combustion engine that can prevent a dog from popping out during operation of the internal combustion engine.

Conventionally, in recoil starters equipped with a dog mechanism, after the engine has started, the dog would fly out due to engine vibrations, etc., and the dog would be struck by the back of the dog by the pulley attached to the crankshaft, causing wear and tear. Something happened.
For this reason, various devices have been developed to improve these drawbacks, and the applicant has already made various proposals and filed applications for them.

FIGS. 1 to 3 show improvements to this type of device that have already been filed by the applicant. That is,
A dog 5 is disposed between a reel 3 rotatably supported by a shaft 2 fixed to a housing 1 and a retainer 4 fixed to one end of the shaft 2, and this dog 5 is protruded from one end. The pivot pin 6 is fitted into a recess (not shown) of the reel 3, and the reel 4 is pivotally attached to the reel 4 so as to be rotatable in the radial outward and outward directions around the pivot pin 6.
Normally, the reel 4 is biased radially inward by the restoring force of the dog spring 7 attached to the recess and the pivot point of the dog 5, and the engaging claw 9 of the pulley 8 attached to the crankshaft is While retracting from the rotation range, two engaging pins 10 and 1 are attached to the other end of the dog 5.
0 is provided in a protruding manner, and one end of a friction spring 11 wound around the shaft portion of the retainer 4 is engaged between the engagement pins 10, 10.

However, this device requires a dog spring 7 separate from the friction spring 11 in order to return the dog 5 to the radially inward direction of the reel 4, which increases the number of parts and makes it impossible to provide this type of device at a low price. A problem has arisen.

Incidentally, devices shown in FIGS. 4 and 5 have been known in the past as devices that prevent the dog from popping out after the engine is started and that reduce the number of parts involved. That is, in the drawings, parts corresponding to those shown in FIGS. 1 to 3 are denoted by the same reference numerals. In the drawings, reference numeral 11' denotes a friction spring wound around the shaft of the retainer 4; are bent at a certain angle and parallel to each other to form a clamping part 12, and this clamping part 1
An engaging pin 10' protruding from the dog 5 is loosely inserted into the dog 2.

However, in this conventional device, the engaging pin 10' was simply inserted loosely into the parallel clamping part 12, so the engaging pin 10' would move outward along the clamping part 12 due to vibrations of the engine. However, there was a risk that the dog 5 would jump out into the rotation range of the engaging claw 9.

The object of the present invention is to eliminate such conventional drawbacks, to provide a starter device for an internal combustion engine that reliably prevents the dog from popping out after the engine has started, and which can be manufactured at low cost. .

Therefore, in the starter device for an internal combustion engine of the present invention, one end of a friction spring is wound around the circumferential surface coaxially with the rotation center of the reel, and the other end is linked to a dog rotatably pivoted to the reel. ,
In a starter device for an internal combustion engine in which the dog is engaged with a pulley connected to the engine to start the engine, the dog is located at the free end of the friction spring at the other end of the wound end of the friction spring, and is wound around the other end of the wound end of the friction spring. A linear press-contact part that is gradually spaced apart from the end, and a substantially inverted U that is adjacent to the press-contact part and protrudes outward.
A shaped bending guide part is provided, and the pressure contact part and the bending guide part are positioned directly above the circumferential area of the dog, while an engaging pin that can be engaged with the pressure contact part and the bending guide part is provided protruding from the free end of the dog. When the reel rotates, the dog is guided to move along the pressure contact part and the bending guide part through the pin, and normally the engagement pin is positioned inside the pressure contact part and pressed, and the free end of the dog is guided inside. It is characterized by being biased towards.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIGS. 6 to 11, reference numeral 13 is a housing, inside which a hollow cylindrical shaft 14 is fixed, and on the outer peripheral surface of this shaft 14 is a reel 15. is rotatably attached. The reel 15 has a concave groove 17 on its outer periphery for accommodating the rope 16, and is rotated by frictional force when the rope 16 is unwound, while a spiral spring disposed between the reel 15 and the housing 13 The rope 16 is reversed by the restoring force of the rope 18, and the rope 16 is wound into the groove 17. Further, a recess 20 whose plane is partitioned into a substantially semicircular shape by reinforcing ribs 19 is formed on the outer surface of the pulley 15, and a recess 21 is formed at the outer peripheral end of the recess 20.

Reference numeral 22 denotes a dog having a substantially sickle-shaped planar shape, and a pivot pin 23 protruding from one end thereof is accommodated in the recessed hole 21, and is moved radially outward and outward with respect to the reel 15 around the pivot pin 23. It is pivoted so that it can rotate freely. 24 is an engagement recess formed on the outer periphery of the dog 22, which is configured to be able to engage with an engagement pawl 26 of a pulley 25 attached to the crankshaft, and 27 is an engagement recess formed on the other end of the dog 22. The protruding engagement pin 28 is a retainer fixed to the end of the shaft 14 via a center screw 29, and one end of a friction spring 31 is wound around the outer peripheral surface of the cylindrical shaft portion 30. .

The wound end of the friction spring 31 is connected to the retainer 2 as shown in FIGS. 8 to 10.
Linear portions 32a, 32b, and 32c holding part of three sides of an equilateral triangle circumscribing the shaft portion 30 of No. 8;
2c, and the linear parts 32a, 32b, 32
It is strongly attached to the shaft portion 30 by the frictional force at each contact point between c and the shaft portion 30. Reference numeral 34 denotes a bending guide portion having a substantially inverted U shape formed between the winding end and the free end of the friction spring 31, and accommodates the engaging pin 27 of the dog 22 inside when the reel 15 rotates forward. Along with reel 15
When the rotation is reversed, the engagement pin 27 is urged to return, and 35 is a friction spring 3.
A linear press-contact part 35 is formed on the free end of the dog 22 and has bending elasticity.Similar to the bend guide part 34, this press-contact part 35 is placed directly above the circumferential area of the dog 22, and when the engine is stopped. During operation and operation, the engagement pin 27 is pressed from the outside to urge the free end of the dog 22 toward the center of the reel 15.

When operating the starter device configured in this way to start the engine, use the operating lever (not shown).
When the rope 16 is pulled outward against the restoring force of the spiral spring 18, the reel 15 rotates, and the dog 22, which is pivotally attached to the reel 15 via the pivot pin 23, moves in the same direction as the reel 15. Rotate.
Therefore, when the reel 15 rotates counterclockwise in FIG. As shown in FIG. 11B, the pressure contact portion 3
The engagement pin 27 is pushed and bent outward against the elastic force of the engagement pin 27, thereby releasing the range of movement of the engagement pin 27.

Then, when the engagement pin 27 moves from the inner circumferential surface of the pressure contact part 35 to the friction spring guide part 35' and reaches the bent edge of the bending guide part 34, the friction spring 31 and the engagement pin 27 move.
Since the engagement with the dog 22 is released, the dog 22 rotates radially outward around the pivot pin 23, and the engagement pin 2
7 is accommodated in the bending guide portion 34, while the engagement recess 24 of the dog 22 projects into the rotation range of the engagement claw 26. Therefore, as shown in FIG. 11C, the engagement recess 24 engages with the engagement pawl 26, and while this engagement is maintained, the pulley 25 rotates and the engine starts.

After the engine is started, when the rotational speed of the pulley 25 becomes higher than the rotational speed of the reel 15, the back of the engagement recess 24 may be struck by the engagement claw 26, but in that case, the engagement claw 26, the dog 22 rotates radially inward around the pivot pin 23 and retreats from the rotation range of the engaging claw 26. Will not wear out or break.

Next, when the rope 16 is released, the reel 15 is reversed by the restoring force of the spiral spring 18, and the dog 22
rotates in the same direction, and when the engagement pin 27 retreats from the bending guide part 34 and reaches the bending edge, the engagement pin 27 engages with the inner surface of the pressure contact part 35, as shown in FIG. 11D. Then, in response to the rotation of the reel 15, it returns to its original position while resisting the elastic force of the pressure contact portion 35.
Therefore, since the dog 22 receives the elastic force of the pressure contact portion 35 from the outside of the engagement pin 27 after returning, the dog 22 will not jump out into the rotation range of the engagement claw 26 due to vibrations of the engine.

FIG. 12 shows another embodiment of the present invention, in which one long engagement pin 27' is formed instead of the two engagement pins 27, 27, and the pressure contact portion 35 Securing a wide contact area against the dog 2
It is characterized by further strengthening the protrusion of 2 and simplifying its structure.

As described above, in the present invention, the free end of the friction spring wound around the shaft of the retainer is pressed from the outside of the engaging pin protruding from the dog, and the free end of the dog is directed toward the center of the reel. Since it is energized, it is possible to reliably and strongly prevent the dog from popping out due to vibrations of the engine, etc. when the engine is stopped or during operation. Further, since the present invention does not require the use of a conventional dog spring, the number of parts can be reduced accordingly, and this type of device can be provided at low cost.

Furthermore, in the present invention, at the other end of the winding end of the friction spring, there is a linear pressure contact part located at the free end of the friction spring and gradually spaced apart from the winding end, and a linear pressure contact part adjacent to the pressure contact part and extending outward. A protruding bending guide portion having a generally inverted U shape is provided, and the pressure contact portion and the bending guide portion are positioned directly above the circumferential region of the dog, and an engagement member is provided at the free end of the dog that can engage the pressure contact portion and the bending guide portion. A dowel pin is provided in a protruding manner, and the dog is guided to move along the pressure contact part and the bending guide part through the pin when the reel rotates, so that the dog operates smoothly and reliably when the reel is rotated in the forward and reverse directions. can be encouraged.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional example, Fig. 2 is a perspective view of a dog spring, Fig. 3 is a sectional view showing main parts of the conventional example shown in Fig. 1, and Fig. 4 is a sectional view showing another conventional example. 5 is a sectional view showing the main part of the conventional example shown in FIG. 4, and FIG. 6 is a sectional view showing an embodiment of the present invention.
FIG. 7 is a cross-sectional view showing the main parts of the present invention, FIGS. 8 to 10 are a perspective view, a plan view, and a side view showing an example of a friction spring used in the present invention, and FIG. Figures A to D are explanatory diagrams sequentially showing the operating states of the present invention, and Fig. 12 is a sectional view showing the main parts of another embodiment of the present invention. 15... Reel, 22... Dog, 25... Pulley, 27... Engaging pin, 31... Friction spring, 34... Bending guide section, 35... Pressing section.

Claims (1)

[Scope of utility model registration request] One end of a friction spring is wound around a peripheral surface coaxial with the rotation center of the reel, and the other end is connected to a dog rotatably pivoted to the reel, and the dog is engaged with a pulley connected to an engine. In the starter device for an internal combustion engine, the other end of the wound end of the friction spring is located at the free end of the friction spring and is gradually spaced apart from the wound end; A substantially inverted U adjacent to the pressure contact portion and protruding outward
A shaped bending guide part is provided, and the pressure contact part and the bending guide part are positioned directly above the circumferential area of the dog, while an engaging pin that can be engaged with the pressure contact part and the bending guide part is provided protruding from the free end of the dog. When the reel rotates, the dog is guided to move along the pressure contact part and the bending guide part through the pin, and normally the engagement pin is positioned inside the pressure contact part and pressed, and the free end of the dog is guided inside. A starter device for an internal combustion engine, characterized in that the starter device is configured to energize the engine.