JPS5930218Y2 - Forced air-cooled engine with recoil starter - Google Patents

Description

[Detailed explanation of the idea] This idea is related to the engine glue coil starter.

The purpose is to make the structure simple and inexpensive, and to improve the air intake efficiency of the cooling fan.

Normally, a recoil starter is provided with a retaining pawl that protrudes and retracts in the radial direction on a friction plate that rotates together with the reel, and the starting power 4 is transmitted via the engaging pawl 4 to a starting pulley fixed to a cooling fan.

However, with this structure, the starting pulley occupies a large space in the cooling air passage from the dust-proof air intake port of the starter case to the cooling fan, which narrows the cooling air passage and reduces the air intake efficiency of the cooling fan. There was a drawback.

In addition, at the beginning of the reel's rotation, the frictional force of a spring is used to advance the engaging pawl in the radial direction. The engagement pawl does not operate reliably due to wear of the friction member during the process or dust adhesion to the member, resulting in poor durability.

In order to eliminate the above-mentioned drawbacks, this invention protrudes toward the starting power output axial cooling fan that rotates together with the reel.
An engaging member that is moved in the axial direction by a cam is provided on this shaft, and the passive part clasp that engages with the engaging member to generate the starting power is provided facing the output shaft of the cooling fan. Accordingly, the fourth feature is that the starting boot can be reliably engaged and disengaged by the cam to the driven member.

This invention will be explained below based on the implementation sidetone drawings.

FIG. 1 is a cutaway side view of the main parts of a forced air-cooled engine.

FIG. 2 is a sectional view taken along the line ■--■ in FIG. 1.

In the figure, 1 is a crankcase, 2 is a crankshaft (rotating shaft) 3 is a cooling fan fixed to the front end of the crankshaft 2 with a peg 21, and 4 is a fan case that covers the outer surface 4 of the cooling fan 3.

An air intake port 5 is provided in a portion of the fan case 4 that faces the cooling fan 3.

A recoil star 6 is attached to the fan case 4 so as to cover the outer surface 4 of the recoil star 6.

The recoil starter 6 includes a starting part that generates starting power noise, a starting power transmitting part that transmits the starting power to the crankshaft 2, and metal parts in an arm-shaped starter case T.

The starting part includes a reel spindle 8 fixed to the central inner surface of the starter case 7, a reel 11 for winding the starting rope 10 which is rotatably supported on the reel spindle 8 via a cylindrical shaft 9 metal, and a reel 11 for winding the starting rope 10. It is composed of a 11-karat gold rock return force and a coil spring 12, and a rotating blade is generated by pulling the 10-karat gold starting rope.

The starting power transmission section includes an output shaft 14 that is connected and fixed to the Kusunoki shaft 9 with a pin 13 and protrudes to face the tip of the crankshaft 2, and an output shaft 14 that is fitted onto the tip of the output shaft 14. It is composed of a cylindrical engaging member 15, a return spring 16 that pushes the metal crankshaft toward the metal crankshaft, and a friction spring 17 that presses against the engaging member 15.

A cam groove (partial helical cam) 18 is diagonally connected to the peripheral wall of the engaging member 15, and an engaging piece 1 is provided on the outer edge of the protruding end thereof.
9 is provided protrudingly.

As shown in FIG. 3, the cam groove 18 is engaged with a pin 20 fixed to the output shaft 14.

As the output shaft 14 rotates, the cam mechanism 18 moves toward the reel 11 as shown by the imaginary line.

The entire engaging member 15 retreats against the return spring 16.

In order to connect the power tube from the engaging member 15, a cylindrical passive member 22 is integrally attached to a NAND 21 to which a cooling fan is fixed.

An engagement protrusion with which the engagement piece 19 engages is provided on the inner edge of the opening of the node hole of the passive member 22 .

As shown in FIG. 2, both ends of the friction spring 17 are fixed to the starter case 7, and the engaging member 15 is held in a ring-shaped portion at the center thereof.

The money will be explained below.

When the starting rope is pulled, the output shaft 14 rotates together with the lug 11, and the engaging member 154 attempts to rotate via the pin 20 gold.

At this time, since the friction spring 17 is in pressure contact with the engaging member 15, the rotational force of the output shaft 14 is converted into a sliding force in the axial direction via the cam groove 18 metal, and the engaging member 15 moves toward the reel 11. Then, the engaging piece 19 engages with the engaging protrusion 23 of the passive member 22.

Thereafter, the output shaft 14, the engaging member 15, and the passive member 22 rotate together, and the crankshaft 2 is forcibly rotated through the nut 21 metal.

After this, when the engine is started, the passive member 22 rotates in advance, and its engagement protrusion 23 forces the engagement piece 19 to rotate, so that the engagement member 15 can be guided by its cam groove 18 with the pin 20. As a result, the crankshaft moves to the second position, and the engagement with the passive member 22 is released.

4 and 5 show different embodiments, and the one shown in FIG. 4 has a dedicated passive member 22 separate from the NAND 21.
The point shown in FIG. 5 is that the passive member 22 is tightened and fixed with a purple nand 21, and the engaging member 15 that engages with it is fixed in the gold output shaft 14. Each differs from the above embodiments in that the friction spring is formed of a 17-karat gold compression spring.

As explained above, in this invention, the output shaft metal of the recoil starter is provided protruding toward the rotating shaft of the engine, and the engaging member, passive member, and metal forming the power cut-off mechanism are provided on the opposing parts of both shafts. Therefore, the starting pulley 4, which was a major obstacle during the ventilation of the cooling air, is eliminated, the cooling air passage 4 is expanded by that amount, the air intake efficiency of the cooling fan is improved, and the cooling effect of the engine can be increased.

Furthermore, since the engaging part hammer cam 4 is used to move the engaging part in a positive manner, and the starting power is intermittent and constant, the retaining part can be moved with a light force, and it is possible to move the retaining part with only a difference in frictional force. Compared to the case where the engaging claw metal is protruding and retracting, the structure of the intermittent mechanism part can be made of metal parts, smaller in size, and cheaper.

Moreover, it can be operated reliably over a long period of time without intermittent operation noise.

The durability and reliability of the starter is second to none.

[Brief explanation of drawings]

The drawings show an example of this invention; Fig. 1 is a cutaway side view of the main parts of the engine; Fig. 2 is a sectional view taken along the line ■-■ of Fig. 1; Fig. 3 is an enlarged sectional view of the main parts; Fig. 4. , and FIG. 5 are sectional views of main parts corresponding to FIG. 1 of the gold stone of different embodiments. 2...Rotating shaft (crankshaft), 3...
Cooling fan case, 5...Air intake port, 6...
... Recoil star, 10 ... Starting rope, 1
1... Reel, 14... Output shaft, 15
. . . Engaging member, 18 . . . Partial spiral cam (cam groove), 22 . . . Passive member.

Claims (1)

[Scope of Claim for Utility Model Registration] A cooling fan 3 is fixed in gold to the rotating shaft 2 of the engine, and the outer surface of the cooling fan 3 is covered with a gold fan case 4.
The recoil starter 6 is installed on the wall facing the rotating shaft 2 of the starter case 7, and the recoil starter 6 is installed on the outer surface of the air intake port 5 of the cooling fan 3, which is located on the wall facing the rotating shaft 2 of the starter case 7. The reel support shaft is fixed in 3 gold, and the reel support shaft 8 supports a 14 gold output shaft for outputting starting power that rotates together with the starting rope winding reel 11, and the output shaft 14 and the rotating shafts 2 and 4 engage members 15. It is configured such that transmission and transmission can be interrupted by fitting and disengaging the and passive member 22. The passive member 22 is fixed to the rotating shaft 2, and the engaging member 15 is attached to the output shaft 14 via a partial helical cam so as to be movable in the direction of the output shaft axis within a certain range.
6 in the disengagement direction, the engagement member 15 is made to engage the friction spring 17, and the engagement member 15 is moved to the transmission position and the spring engaged with the gold passive member by the starting rotational force of the output shaft 14. A forced air-cooled engine that can be automatically switched to a transmission cutoff position that can be disconnected at 16, and is equipped with a coil starter.