JPS6113745Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a dog spring in a recoil starter device.

Conventionally, as shown in FIG. 11, the dog spring a is
It has a coiled base b, an extension part c extending from one end of the base, and an engaging part d provided at right angles to the extension part, and the coiled base a is attached to the base end of the dock e. The engaging part d is in contact with the back of the dock e, but since the dock e vibrates due to the vibration of the engine connected to the recoil starter device,
The engaging part that is in contact with the dock may wear out, or excessive force may be applied to the engaging part d, causing the perpendicularly bent part at the tip of the extension part to break, which may cause serious trouble to the recoil starter device. There was a problem of giving

In view of this, the present invention provides a structure of a dock spring in a recoil starter device in which the durability of the dock spring is improved by forming a curved portion extending toward the rear side of the dock at the tip of the extension. The purpose is to solve problems.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 4, reference numeral 1 denotes a recoil starter device installed in a snowmobile or the like, and a rope winding reel 3,
A retainer cam 5 and a dock 7 engaged with a dock spring 6 are housed therein, and a crankshaft (not shown) is started and rotated via a crank pulley 8.

The housing 2 has a substantially bowl-like shape, and one end of a support shaft 10 is fixed to the inner wall of the central portion. The spindle 10 is
It is a hollow body consisting of a large diameter portion 10a and a small diameter portion 10b, and a center screw 9 is screwed into the small diameter portion 10b via a washer 11 having a through hole 11a for retaining grease at the outer end of the small diameter portion 10b.

The reel 3 is made of an oil-resistant and heat-resistant synthetic resin material, such as glass-filled nylon, and has a boss portion 3a, a dock storage portion 3b, an arm portion 3c, and a rim portion 3d connected in this order. The boss portion 3a is rotatably fitted to the large diameter portion 10a of the support shaft 10 via a bearing 12. The dock storage section 3b is provided at two symmetrical positions with the support shaft 10 as the center, and the space 13 that receives the base end 7a of the dock 7 is located axially and diagonally from the opening edge of the space 13. outwardly flat dock support surface 14
is formed. A rope 15 with one end connected to the reel 3 is wound around the rim portion 3d.
The other end of 5 is a handle 1 extending outside the housing 2.
6. Further, a spiral spring 17 and a spring case 18 are provided between the inner wall surface of the housing 2 and the reel 3, and the spiral spring 17 is connected to the reel 3 and urges the reel 3 in the winding direction of the rope 15. ing.

The retainer cams 5 are formed of a metal material into a substantially disk shape, and are rotatably fitted to the small diameter portion 10b of the support shaft 10.
The paired cam portion 5a and dock support portion 5b have a notch 5c.
The area is divided by The cam part 5a has
A cam surface 19 that comes into contact with the inner surface of the dock 7 is formed at one corner of the outer periphery. The cam surface 19 is the dot 7
When the reel 3 is stored, it becomes parallel to the inner surface of the dock and flush with the dock support surface 14 of the reel 3. Further, the dock support portion 5b slightly protrudes outward from the cam portion 5a, and has an outer peripheral edge bent at a substantially right angle to regulate the position of the dock 7 when the dock is stored.

Further, the small diameter portion 10b of the support shaft 10 has a large diameter portion 1.
A spring 20 and a washer 21 are provided between Oa and the retainer cam 5, and the spring 20 presses the retainer cam 5 against the center screw 9.

The crank pulley 8 is formed into a substantially bowl shape so as to enclose the dock storage portion 3b of the reel 3 and the retainer cam 5, and a plurality of locking portions 8a protruding inward on the outer periphery are spaced at regular intervals and are pressed together. Continuous bending is formed by processing.

The dock 7 is formed from a metal plate, and the proximal end 7a wound into a cylindrical shape is connected to the reel 3 via the dock spring 6.
It is rotatably fitted into the space 13 of.

As shown in FIGS. 5 to 7, the dog spring 6 includes a coil base 6a and an extension 6b extending from one end of the base, and the coil base is connected to the space 13.
and place the dock 7 on the cam surface 1 of the retainer cam 5.
It is biased so that it comes into pressure contact with 9.

The extending portion 6b is closer to the dock 7 than the coiled base 6a.
The extension part 6c is provided with an extension part 6c extending toward the distal end side of the extension part 6c.
A curved portion 6d protrudes toward the outer surface of the dock 7 at the tip of the dot 7.
However, an engaging portion 6e is further formed following the curved portion and substantially perpendicular to the extension portion 6c, and a U is provided at the tip of the engaging portion 6e.
A letter-shaped bent portion 6f is formed to urge the engaging portion 6e to contact the outer surface of the dock 7 and press the inner surface of the dock against the cam surface 19 of the retainer cam 5.

Next, the effect will be explained. When starting the engine, when the reel 3 is rotated by pulling the rope 15, the dot 7 protrudes in the centrifugal direction via the cam surface 19 of the retainer cam 5, and its tip abuts against the locking part 8a of the crank pulley 8. Pulley 8 will rotate.

After the engine starts, when you release the rope 15, the reel 3
is reversely rotated by the spiral spring 17 and the rope 15 is reeled in, while the dock 7 is retracted while being pressed against the cam surface 19 and the dock support surface 14 of the reel 3 by the engaging portion 6e of the dock spring 6.

In this state, the dog 7 vibrates due to engine vibrations, and a large force is applied to the engaging portion 6e of the dog spring 6, but this force is applied to the curved portion 6 at the tip of the extension portion 6c.
Since it is absorbed at point d, damage to the dowel spring 6 is not caused. In addition, the engaging portion 6e of the dog spring 6
has a U-shaped bent portion 6f at its tip and contacts the dock 7 with a wide contact area, so the contact pressure against the dock is small, so there is little wear due to contact.

Note that the engaging portion 6e may be inclined with respect to the winding axis of the coiled base portion 6a. That is, as shown in FIG. 8, the engaging portion 6e is inclined toward the back surface of the dock 7 as it goes from the proximal end to the distal end, and a gap is created between the back surface and the proximal portion of the engaging portion 6e. 22, it is possible to prevent wear and breakage due to contact of the proximal end portion with the dot 7. In this case, the engaging portion 6e is the distal end portion 6
Even if f is worn out or broken, the remaining part of the engaging portion 6e can press the dot 7, so the operation of the recoil starter device 1 is not affected.

Furthermore, if the engaging portion 6e is tilted in advance as shown in FIG. 9, when the dock spring 6 is attached to the dock 7, the proximal end portion of the engaging portion 6e will be aligned with the dock 7 as shown in FIG. Even if it comes into contact with the back surface of the material, the surface pressure is very small, so wear and breakage due to contact are prevented.

As mentioned above, according to the dotsukubane of the present invention,
Since the extension part is provided with a curved part, the dock spring will not break even if a large force is applied to the engaging part due to the vibration of the dock, and the service life of the dock spring will be significantly extended, which is an excellent effect.

[Brief explanation of the drawing]

Figures 1 to 10 illustrate embodiments of the present invention, with Figure 1 being a plan view of the recoil starter device, Figure 2 being a vertical cross-sectional view of the main part, and Figures 3 and 4 showing the recoil starter device at rest. FIG. 5 is a perspective view showing the engaged state of the dock and the dock spring, FIG. 6 is a plan view of the same, FIG. 7 is a side view of the same, and FIG. FIG. 8 is a side view similar to FIG. 7 showing another embodiment, FIG. 9 is a side view showing the dock and dock spring in another embodiment in a separated state, and FIG. 10 shows the same engaged state. Side view shown, No. 11
The figure is a perspective view similar to FIG. 5 showing the conventional example. DESCRIPTION OF SYMBOLS 1... Recoil starter device, 2... Housing, 3... Reel, 3b... Dock storage section, 5...
...retainer cam, 5a... cam part, 5b... dock support part, 6... dock spring, 6a... coiled base, 6b... extension part, 6c... extension part, 6d...
...Curved part, 6e...Locking part, 6f...Tip part, 7
...Dock, 7a... Base end, 8... Crank pulley, 8a... Locking part, 9... Center screw, 1
0... Support shaft, 13... Space, 14... Dock support surface, 15... Rope, 17... Spiral spring, 19...
...Cam surface, 22... air gap.

Claims (1)

[Scope of claim for utility model registration] (1) A rope winding reel and a retainer cam are rotatably attached to a support shaft fixed to a housing,
The base end of the dock is stored in the dock storage section of the reel together with the coiled base of the dock spring, and the extension from one end of the coiled base is engaged with the tip of the dock, and the coiled base connects the dock to the retainer cam. The inner surface of the tip of the dock is pressed into contact with the cam surface of the retainer cam at the dock support section and the extension section, and the rotation of the reel causes the dock to protrude in the centrifugal direction, and the tip of the dock is pressed against the crank pulley. In a recoil starter device that rotates the crank pulley by contacting a locking portion, the extension portion of the dock spring includes an extension portion extending from the coiled base toward the distal end of the dock, and an extension portion provided approximately at right angles to the extension portion. What is claimed is: 1. A structure of a dock spring in a recoil starter device, characterized in that the extension part has a curved part extending toward the outside of the dock at the tip of the extension part. (2) The structure of a dome spring in a recoil starter device according to claim 1 of the utility model registration claim, wherein the engaging portion has a tip bent in a U-shape. (3) The structure of the dome spring in the recoil starter device according to claim 1, wherein the engaging portion is inclined toward the dot as it goes toward the tip.