JPS636459Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recoil starter device, and particularly to a recoil starter device that makes the operation of a retainer cam more accurate.

Generally, in a recoil starter device, a rope take-up reel and a retainer cam are rotatably fitted into a support shaft fixed to a housing, and the retainer cam has a constant friction against a center screw fixed to one end of the support shaft. A dog is provided between the reel and the retainer cam, and when the rope is pulled and the reel is rotated, the retainer cam comes into contact with the inner surface of the dog. The dog is configured to fly out in the centrifugal direction and come into contact with the crank pulley to start and rotate the pulley.

Conventionally, in the above recoil starter device, the retainer cam is in direct contact with the center screw, which has the disadvantage that lubricating oil is difficult to penetrate between the contact surfaces of the two, and a constant frictional force does not act between the two. There were cases where the rotation stop was inaccurate and the dog did not operate accurately.

This invention was made in view of these points,
A washer with a through hole for a grease reservoir is interposed between the retainer cam and the center screw, and the seat surface for tightening the center screw and the retainer cam cover the through hole for the grease reservoir in the washer. To provide a recoil starter device in which a constant frictional force acts between both a center screw and a retainer cam, so that the retainer cam operates accurately.

Hereinafter, embodiments of the present invention will be described based on the drawings.

1 to 5, reference numeral 1 denotes a recoil starter device installed in a snowmobile or the like, in which a rope winding reel 4 having a dog 3 and a retainer cam 5 are housed in a housing 2.
The crankshaft 30 is started to rotate together with the flywheel 31 via the crank pulley 6.

The housing 2 is formed into a substantially bowl shape, and has an end plate 2.
A support shaft 7 is fixed at one end to the inner central part of the support shaft 7. The support shaft 7 is a hollow body consisting of a large diameter part 7a and a small diameter part 7b, and has a female thread formed therein.
A center screw 9 is removably screwed and fixed to the outer end of b via a washer 8. This center screw 9 is attached to a flange 9a that constitutes a seating surface for tightening.
It is equipped with

The reel 4 includes a boss portion 4a and a dog accommodating portion 4.
b, the arm part 4c and the rim part 4d are connected in order, and are made of an oil-resistant and heat-resistant synthetic resin material, such as glass-filled nylon, and the boss part 4a
is rotatably fitted to the large diameter portion 7a via a bearing 10. The dog accommodating parts 4b are provided in two symmetrical positions and extend outward in parallel with the support shaft 7, and a space 11 for supporting a cylindrical pivot part 3a of the dog 3, which will be described later, is provided in the axial direction on the outer circumferential surface. is a dog support surface 12 that is flat obliquely outward from the opening edge of the space 11.
is formed. A rope 13 is suspended around the rim portion 4d, one end of the rope 13 is connected to the reel 4, and the other end extends outside the housing 2. Further, a spiral spring 14 and a spring case 15 are provided between the end plate 2a of the housing 2 and the reel 4,
The spiral spring 14 is connected to the reel 4, and the reel 4
is biased in the winding direction of the rope 13.

The dog 3 is made of a metal material, and has a cylindrically wound pivot part 3a continuously formed at one end of a plate-like body, and the pivot part 3a is inserted into the space 11 of the reel 4, and the reel It is rotatably attached to 4. Further, a dog spring 16 is housed in the space 11, and one end of the dog spring 16 engages with the back surface of the dog 3 to press the dog 3 against the support surface 12.

The retainer cam 5 is formed of a metal material into a disk shape and rotatably fitted into the small diameter portion 7b, and has two pairs of diagonally located cam portions 5a and 5b defined by a radial notch 17. There is. A cam surface 18 that comes into contact with the inner surface of the dog 3 is formed by cutting out a flat surface at one corner of the outer circumference of the first cam surface 5a. The cam surface 18 is parallel to the inner surface of the dog 3 when the dog 3 is retracted and is parallel to the support surface 12 of the reel 4.
It is on the same plane as the support surface 12, and receives the dog 3 together with the support surface 12. The second cam portion 5b slightly bulges outward, and its outer peripheral edge is bent inward at right angles to form a dog locking portion 19, which engages with the back surface of the dog 3 when stored. Dotsugu 3 in
The rotation in the protruding direction is restricted.

Also, the small diameter portion 7b has a retainer cam 5 and a large diameter portion 7.
A spring 20 and a washer 21 are provided between the retainer cam 5 and the center screw 9. It's getting old.

As shown in FIG. 6, the washer 8 is formed into a disk shape, and has a shaft hole 22 in the center and a grease reservoir through hole 23 penetrating both sides.
It is made up of multiple irregularly drilled holes. This grease reservoir through hole 23 is covered by the retainer cam 5 and the seat surface formed by the flange 9a of the center screw 9. Furthermore, the washer 8 has a certain hardness (for example, Bitkers hardness of 500), and the retainer cam 5 and the flange 9 of the center screw 9
It is made harder than A (seat surface) to achieve wear resistance.
In addition, as for the material, a stainless steel plate is preferable since a hardened steel plate is easily rusted. Furthermore, if the number of through holes 23 and the amount of grease are too good for lubricity, the braking effect of the retainer cam 5 will be lost.
It is constructed to have a certain degree of lubricity. The through hole 23 is filled with grease, and the grease is applied to the retainer cam 5 and washer 8.
During this time, the friction force penetrates evenly between the center screw 9 and the washer 8, so that a constant frictional force always acts between the retainer cam 5 and the center screw 9.

The crank pulley 6 has an end plate 6a and an outer peripheral plate 6b.
The accommodating portion 4b of the reel 4 is formed into a substantially bowl shape.
and a retainer cam 5. Outer peripheral plate 6b
A plurality of protrusions 24 protruding inward are formed in a circumferential manner at regular intervals, and the protrusions 24 are continuously bent by press working.

Next, the effect will be explained. When starting the engine, when the rope 13 is pulled from the state shown in FIG. As a result, the cam surface 18 presses the dog 3, causing the dog 3 to protrude in the centrifugal direction, and the tip of the dog 3 comes into contact with the protrusion 24, causing the crank pulley 6 to start rotating (first rotation). (See Figure 4).

When the engine rotates and releases the rope 13, the reel 4 is rotated in the opposite direction by the spiral spring 14, and the rope 1
3, the retainer cam 5 no longer presses the dog 3, and the dog 3 is pressed against the support surface 12 and the cam surface 18 by the dog spring 16 and is stored (see FIG. 3).

Furthermore, since the locking portion 19 is engaged with the back surface of the dog 3, rotation of the dog 3 due to engine vibration etc. is restricted during storage, so that the dog 3 is reliably supported.

FIG. 7 shows another washer 25 in which a shaft hole 26 is drilled in the center and a plurality of through holes 27 for grease reservoir are bored on the same circumferential line.

In addition, although the through holes 23 and 27 were formed circularly,
It may be made into various shapes such as a rectangular shape.

As described above, according to the recoil starter device of the present invention, a washer with a through hole for a grease reservoir is interposed between the retainer cam and the center screw, and a washer and the center screw are provided between the washer and the retainer cam and between the washer and the center screw. Since it is possible to provide an appropriate level of lubricity between the seat and the seat, it is easy to maintain a constant frictional force between the two, and this lubrication also makes the washer hard. In addition to suppressing wear on the retainer cam and center screw, even if one side (for example, between the washer and the retainer cam) becomes jammed due to foreign matter getting caught, lubrication is obtained on the other side. Since there is no sudden change in the frictional force acting between the retainer cam and the center screw, and the rotation of the retainer cam can be accurately stopped, the dog can operate extremely accurately. In the case of the present invention, since the grease reservoir is constituted by a through hole, it is possible to increase the amount of grease retained and improve durability. Since the tip of the shaft and the center screw face each other, the amount of protrusion of the center screw from the retainer cam affects the overall length of the engine.
Since it is possible to hold a large amount of grease, it is possible to reduce the thickness of the washer plate, reduce the amount of protrusion of the center screw mentioned above, and shorten the overall length of the engine.Furthermore, the grease reservoir of the washer can be made by punching. Because it can be formed, the washer is easy to manufacture and costs can be reduced, and the washer can be made of a relatively hard material.
It becomes easy to prevent wear of the washers due to dust.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the present invention, in which Fig. 1 is an overall plan view of the recoil starter device, Fig. 2 is a central vertical sectional view thereof, and Fig. 3 is a view of Fig. 2A-A when stopped.
The end view of line A, Figure 4 is Figure 2 A during driving.
- An end view taken along line A; Figure 5 is an enlarged vertical sectional view of the main parts;
FIG. 6 is a plan view of the washer, and FIG. 7 is a plan view of another washer. DESCRIPTION OF SYMBOLS 1... Recoil starter device, 2... Housing, 3... Dog, 4... Reel, 4b... Dog housing part, 5... Retainer cam, 6... Crank pulley, 7... Support shaft, 8, 25... ...Washiya, 9
... Center screw, 13 ... Rope, 22, 26
...Shaft hole, 23, 27...Through hole.

Claims (1)

[Scope of utility model registration request] A rope winding reel rotatably held on a support shaft fixed to the housing, and a retainer cam rotatably inserted into the support shaft by being pressed by a center screw removably fixed to one end of the support shaft. In the recoil starter device, a dog having one end supported by a reel is provided between the retainer cam and the retainer cam. A washer is interposed between the seat surface of the center screw and the seat surface of the center screw, and a plurality of through holes for grease reservoirs are bored through both sides of the washer. A recoil starter device characterized in that a face and a face are covered.