JPS636458Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a recoil starter device.

Generally, as shown in FIG. 5, in a recoil starter device a, a rope winding reel b and a retainer cam c are rotatably fitted into a support shaft fixed to a housing, and the retainer cam c is attached to one end of the support shaft. While being pressed so that a constant frictional force acts on the fixed center screw d, a dog e whose one end is pivoted to the reel b is provided between the reel b and the retainer cam c to pull the rope. then reel b
When the retainer cam c comes into contact with the inner surface of the dog e, the dog e pops out in the centrifugal direction and comes into contact with a crank pulley f fixed to the crankshaft, causing the pulley f to start and rotate. .

The crank pulley f has a plurality of protrusions h protruding inwardly formed on the outer circumferential plate g, and the protrusions h cut a part of the outer circumferential plate g to form a split i, and one side of the split i. It is formed in a bent manner, and the end surface of the split i serves as the engagement surface of the dog e. However, in the above structure, since the protrusion h is formed by forming the split i, the ridge edge of the tip of the dog e comes into contact with it, and a force acts in the direction of expanding the split i at the time of startup, causing an abnormality. If excessive force or impact is applied due to a reversal caused by an explosion, etc., the pulley f may crack or break, while the split i becomes a starting point for cracks due to vibration, reducing vibration resistance.

In addition, there is also a device in which an engagement hole is formed in the crank pulley so that the dog stands up outward as the reel rotates, and the side surface of the dog is engaged with the crank pulley in the engagement hole. Showa 53-
(Refer to Publication No. 1538) However, when the sides of the dog engage, the dog is subjected to bending force, and in order to resist this bending force, the width of the dog is increased in the circumferential direction of the recoil starter device, or the dog is expanded in the axial direction. It becomes necessary to add some thickness.

In the present invention, as a means to solve such problems, the dog is made into a plate-like body whose plate surface is parallel to the spindle of the reel, and the tip surface that comes into contact with the crank pulley is made approximately perpendicular to the longitudinal direction of the dog. A chevron-shaped protrusion with a flat dog-engaging surface is formed on the outer peripheral plate by continuous bending, while the outer peripheral part of the retainer cam has a cam surface that guides the inner surface of the dog when the dog pops out, and a cam surface that guides the inner surface of the dog when the dog pops out. On the other hand, a recoil starter is formed with a regulating section that is partitioned through a notch and that, together with the cam surface, regulates the protruding direction of the dog so that the distal end surface of the dog comes into surface contact with the dog engaging surface of the crank pulley. It provides equipment.

In other words, in the case of the recoil starter device of the present invention, when the reel is rotated, the dog is guided by the cam surface of the retainer cam and is regulated by the regulating part, so that the leading end surface makes surface contact with the flat dog engagement surface of the crank pulley. I come to do it. The reaction force due to this surface contact acts on the dog in the longitudinal direction as a compressive force.

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

1 to 4, 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.
A crankshaft (not shown) is started and rotated via a 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.

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 whose plate surface is parallel to the support shaft 7. It is inserted into the space 11 of the reel 4 and rotatably attached to the reel 4. The dog 3 has a distal end surface that comes into contact with the crank pulley 6 and is formed approximately at right angles to the longitudinal direction of the dog 3. Furthermore, a dog spring 16 is provided in the space 11.
is stored, 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 into a disk shape from a metal material, is rotatably fitted into the small diameter portion 7b, and has a pair of cam portions 5a, which respectively protrude in opposite directions.
5a and a pair of dog support parts 5 that support the dog 3 between the reel 4 and the reel 4 that also extends in the opposite direction.
b, 5b are defined by radial notches 17. A cam surface 18 that comes into contact with the inner surface of the dog 3 is formed at one corner of the outer periphery of the cam portion 5a by cutting it into a flat surface. The cam surface 18 is parallel to the inner surface of the dog 3 when the dog 3 is stored, and is parallel to the reel 4.
The dog 3 can be received on the same plane as the support surface 12 of the dog 3. Further, the dog support portion 5b slightly bulges outward, and a dog restriction portion 19 is formed at the outer peripheral edge by bending inward at right angles.

In this case, the cam surface 18 and the regulating portion 19 are separated through the notch 17, and the cam surface 18
Reference numeral 8 guides the inner surface of the dog 3 when the dog 3 protrudes, and the regulating portion 19 works together with the cam surface 18 to guide the protruding direction of the dog 3 so that the tip surface of the dog 3 is connected to the crank pulley 6, which will be described later. Control so that there is face-to-face contact. Further, the restricting portion 19 engages with the back surface of the dog 3 when the dog is stored, and restricts the rotation of the dog 3 toward the protruding side.

Further, in the small diameter portion 7b, the retainer cam 5
A spring 20 and a washer 21 are provided between the large diameter portion 7a and the spring 20, and the spring 20 presses the retainer cam 5 against the center screw 9.
A constant frictional force is applied between the center screw 9 and the center screw 9 via the washer 8.

The crank pulley 6 has an end plate 6a and an outer peripheral plate 4b.
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 chevron-shaped protrusions 22 protruding inward from the arc portion are formed in a circumferential manner at regular intervals, and one inner surface of the protrusions 22 serves as a dog engagement surface 22a, and one inner surface serves as a connecting surface 22b. Both surfaces 22a and 22b are formed flat. Furthermore, the engagement surface 22a
is inclined by 30±5 degrees (α) with respect to the line It's getting old.

Further, the formation of the protrusion 22 is such that, as shown in FIGS. 6 and 7, a chevron-shaped protrusion 24 corresponding to the protrusion 22 is formed on the outer circumferential surface of the core mold 23, and a protrusion is formed on the distal end surface of the mold 25. A chevron-shaped convex portion 26 corresponding to the portion 22 is formed, and the pulley 6 is inserted and held in the core mold 23 to form the mold 25.
This is done by moving the robot forward and backward from the outside. By this press working, a protrusion 22 having approximately the same thickness as the circular arc portion is continuously bent and formed on the outer circumferential plate 6b. The pulley 6 is then carburized and hardened.

The washer 8 is provided with a plurality of through holes 27 for holding grease.

Next, the effect will be explained. When starting the engine, when the rope 13 is pulled from the state shown in FIG.
The dog 3 is pushed out in the centrifugal direction, and the distal end surface of the dog 3 meets the engagement surface 22a of the protrusion 22.
The crank pulley 6 is brought into full contact and engaged, and the crank pulley 6 starts to rotate (see Fig. 4).

In this case, since the dog 3 and the dog engaging surface 22a are in surface contact, the surface pressure acting on the crank pulley 6 is small, and the reaction force against the dog 3 due to the engagement with the dog engaging surface 22a is small. acts as a compressive force in the longitudinal direction and does not substantially act as a bending force. Then, the dog 3 protrudes from the position of the notch 17 of the retainer cam 5 and engages with the dog engagement surface 22a of the crank pulley 6, but the dog locking portion 19 is located on the back of the protruding dog 3. Together with the dog spring 16 and the cam surface 18, the dog 3 is restricted so that its longitudinal direction is substantially perpendicular to the dog engaging surface 22a, thereby ensuring surface contact between the dog 3 and the dog engaging surface 22a. .

Further, when the engine rotates and the rope 13 is released, the reel 4 rotates in the opposite direction due to the spiral spring 14 to reel in the rope 13, while the retainer cam 5 no longer presses the dog 3, and the dog 3 is moved to the engagement surface 22a.
The support surface 12 is spaced further apart by the dog spring 16.
and is stored by pressing against the cam surface 18. (See Figure 3).

Since the restricting portion 19 is engaged with the rear surface of the dog 3, the rotation of the dog 3 due to engine vibration etc. is restricted during storage, and the dog 3 is reliably supported.

In this embodiment, the inclination angle α of the engagement surface 22a is set to 30±5 degrees with respect to the line X, but it can be implemented as long as it is within the range of 15 degrees to 45 degrees.

Note that the inclination angle α of 30±5 degrees is the most desirable range for processing in order to ensure a flat portion.

Therefore, according to the present invention, the following effects can be obtained.

The distal end surface of the plate-shaped dog in its longitudinal direction is brought into reliable surface contact with the flat dog engagement surface formed by continuous bending of the crank pulley by the cam surface of the retainer cam and the regulating portion.

The surface contact described above reduces the surface pressure between the dog tip surface and the dog engagement surface, thereby preventing wear and damage on both surfaces.

Since the reaction force caused by the engagement with the dog engagement surface acts on the dog as a compressive force in the longitudinal direction, it becomes possible to withstand the reaction force even if the dog is made thinner.

Since the weight of the dog can be reduced, the force required to move the dog in and out can be reduced, and therefore, the spring force for the friction of the retainer cam can be weakened to improve operability, and the weight of the entire recoil starter device can also be reduced.

Since the crank pulley can receive the force from the dog without providing a window or notch, its strength or vibration resistance can be improved, and the reliability of the recoil starter device can be improved.

[Brief explanation of drawings]

1 to 4 illustrate embodiments of the present invention, in which FIG. 1 is an overall plan view of the recoil starter device, FIG. 2 is a longitudinal cross-sectional view of the recoil starter device, and FIG. 5 is a cutaway end view of a conventional recoil starter device, FIGS. 6 and 7 show the molded state of the crank pulley of the present invention, and FIG. 6 is a plan sectional view. , FIG. 7 is a side sectional view. DESCRIPTION OF SYMBOLS 1... Recoil starter device, 2... Housing, 3... Dog, 4... Reel, 4b... Dog housing part, 5... Retainer cam, 6... Crank pulley, 6a... End plate, 6b... Outer circumference Board, 7...
...Spindle, 9...Center screw, 13...Rope,
18...Cam surface, 19...Restricting portion, 22...Protrusion, 22a...Engaging surface, 22b...Connecting surface.

Claims (1)

[Scope of utility model registration request] A rope winding reel is rotatably held on a support shaft fixed to the housing, and a center screw is removably fixed to one end of the support shaft. A plate-shaped dog whose one end is rotatably supported by a reel and whose plate surface is parallel to the support shaft is provided between the retainer cam and the retainer cam fitted into the support shaft, and the dog is rotated by rotating the reel. In the recoil starter device, the crank pulley is formed of an end face plate and an outer peripheral plate, and the crank pulley is formed of an end face plate and an outer circumferential plate, and the crank pulley is formed of an end face plate and an outer circumferential plate, and the crank pulley is formed by an end face plate and an outer circumferential plate, and A chevron-shaped protrusion having a flat dog-engaging surface on the inside is formed by continuous bending inward from the retainer cam so as to have approximately the same thickness as the arcuate part, and the outer periphery of the retainer cam has a flat dog-engaging surface on the inside. a cam surface that guides the inner surface of the dog; 1. A recoil starter device characterized in that a regulating portion is formed to regulate the recoil starter device, and the distal end surface of the dog is substantially perpendicular to the longitudinal direction of the dog.