JPH0513986Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) This invention relates to a kick starting device for starting a motorcycle engine or the like.

(Prior Art) Many motorcycle engines and other small engines are equipped with a kick starting device. The kick starting system drives the engine crankshaft using a kicking force, but in normal conditions other than when starting, it is necessary to separate the kick starting system from the crankshaft. For this purpose, various mechanisms are used, such as interposing a one-way clutch or using a plunge gear. Figure 3 shows:
This is an example of a kick starting device using a ratchet mechanism. A driven ratchet 2 is fixed to a crankshaft 1, and a drive ratchet 4 is provided opposite to the side surface of a hard driven gear 3 which is freely supported on the crankshaft 1. On the opposite side of Kizuku Driven Gear 3,
An elastic spring 6 is elastically mounted between the circlip 5 fitted to the end of the crankshaft 1, and the force of the elastic spring 6 urges the drive latchet 4 so that it is always in contact with the driven latchet 2. There is. The tooth profiles of the drive ratchet 4 and the driven ratchet 2 are as shown in Fig. 4. When the drive ratchet 4 rotates in the direction of the arrow, it is integrally connected with the driven ratchet 2 to transmit rotation, and the driven ratchet 4 rotates in the direction of the arrow. 2 overruns in the direction of the arrow, it slips and is disconnected from rotation.

As shown in Fig. 5, the kick drive gear 7 is segment-shaped, and is fixed to the kick shaft 8, and is normally placed apart from the kick driven gear 3, but it rotates by a kick operation and connects to the kick driven gear. 3
It is designed to mesh with and drive this. When the hard driven gear 3 rotates in this manner, the drive ratchet 4 transmits the rotation to the driven ratchet 2 to drive the crankshaft 1. After starting, the driven ratchet 2 starts rotating together with the crankshaft 1. At the beginning, the hard drive gear 7 and the hard driven gear 3 are meshed, and the drive brachette 4 is restrained from rotating. Due to this resistance, it is pushed away in the axial direction against the force of the elastic spring 6. Separated from driven ratchet 2. Next, the hard drive gear 7 is connected to the return spring 9.
When the gear is returned to its original position and separated from the hard driven gear 3, the released hard driven gear 3 and drive ratchet 4 come into contact with the driven ratchet 2 due to the elasticity of the elastic spring 6, and rotate as one. It becomes like this.

However, with the above configuration, the drive brachette 4 may be pushed out forcefully and overstroke due to the sudden rotation of the crankshaft 1 immediately after starting, and the back of the drive brachette 4 may come into contact with the teeth of the hard drive gear 7. teeth may be lost due to
A problem arises in that the elastic spring 6 is further compressed from the tight state (fully compressed) and damaged.

(Problems to be solved by the invention) As mentioned above, in the conventional kick starting device, the drive ratchet on the side of the mechanical driven gear, which is loosely supported on the crankshaft, and the driven ratchet, which is fixed to the crankshaft, are engaged. In the case where the ratchet is separated so as not to transmit the rotation of the crankshaft side to the mechanical driven gear while the mechanical driven gear and mechanical driven gear are engaged immediately after starting, the mechanical driven gear and the mechanical driven gear are separated at the time of this disconnection. In view of the problem that the ratchet may overstroke in the axial direction and damage the teeth of the kick drive gear or the spring for ballistic contact of the ratchet, this invention solves this problem, prevents overstroke, and improves the kick drive gear. It is an object of the present invention to provide a kick starting device which prevents damage to an elastic spring for pressing a gear and a ratchet.

[Structure of the idea]

(Means for Solving the Problems) In order to achieve the above object, the kick starting device of this invention uses a drive latchet on the side of the jack driven gear that is loosely supported on the crankshaft, and a driven latch that is fixed to the crankshaft. Facing Etsuto,
The crankshaft and the mechanical driven gear are brought into elastic contact with each other by an elastic spring loaded between the crankshaft and the mechanical driven gear, and a segmental mechanical mechanical drive gear fixed to the mechanical axis is always separated from the mechanical driven gear,
In a kick starting device which is arranged so as to mesh with the kick driven gear when rotated by a kick operation, a spacer is attached to the inner or outer circumference of the elastic spring, and the drive platech and The displacement amount of the mechanical driven gear in the thrust direction is restricted to a small stroke sufficient for the ratchet to disengage.

(Function) With the above-mentioned configuration, when a key operation is performed, the key drive gear meshes with and drives the key driven gear, thereby driving the crankshaft via the ratchet. When the engine starts due to this drive, the crankshaft begins to rotate vigorously, and at this time, the hard drive gear and hard driven gear are engaged, so this acts as resistance and pushes the drive clutch and hard driven gear in the axial direction. Ratchet leaves. However, the axial displacement stroke is regulated by the spacer, and the elastic spring is not fully compressed and does not collide with the side surface of the hard drive gear teeth, thereby preventing breakage or chipping accidents.

(Example) An embodiment of this invention is shown in FIGS. 1 and 2.

A driven ratchet 2 fixed to the crankshaft 1, a mechanical driven gear 3 freely supported on the crankshaft 1, a drive ratchet 4 provided on the side thereof,
The construction and operation of the elastic spring 6 for elastic contact between the latches 2 and 4 and the like are the same as those of the prior art.

In the one shown in FIG. 1, a spacer 9 with a flange portion 10 that is secured by a circlip 5 is pivotally supported at the end of the crankshaft 1, and an elastic spring 6 is elastically disposed between the flange portion 10 and the rigid driven gear 3. be equipped. A gap D is provided between the spacer 9 and the mechanical driven gear 3. The gap D is larger than the height A of the ratchet teeth of the drive and driven latches 4 and 2, smaller than the gap d between the back of the drive latchet 4 and the teeth of the kick drive gear 7 when the latches are engaged, and has elasticity. It is set smaller than the difference l between the bullet length La and the total compression length Lb of the spring 6. That is, A<D<d,l. Therefore, when the ratchet separates immediately after starting, the elastic spring 6 is compressed to more than the full compression and is damaged, and the back of the drive ratchet 4 is pressed against the hard drive gear teeth. There will be no damage due to collision.

In FIG. 2, a spacer 11 with an inner flange 12 is placed over the outer periphery of the elastic spring 6, and a gap D is set, and the effect is exactly the same.

[Effect of idea]

The kick starting device according to this invention has the configuration and operation as described above, and regulates the overstroke of the kick driven gear to prevent damage to the elastic spring for ratchet elastic contact and loss of the teeth of the kick drive gear. This has the effect of ensuring stable operation of the kick starting device over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view of the crankshaft end showing an embodiment of this invention, Fig. 2 is a longitudinal sectional side view of the crankshaft end showing another embodiment, and Fig. 3 is an example of a conventional kick starting device. 4 is a developed side view of the ratchet, and FIG. 5 is a front view of the kick drive gear. 1... Crankshaft, 2... Driven ratchet, 3... Hard driven gear, 4... Drive ratchet, 5... Circlip, 6... Elastic spring, 7... Hard drive gear, 9,11
……Spacer.

Claims (1)

[Scope of utility model registration request] The drive ratchet on the side of the hard driven gear, which is loosely supported on the crankshaft, and the driven ratchet fixed to the crankshaft face each other, and the elastic spring is elastically mounted between the crankshaft and the hard driven gear. At the same time, a segment-shaped wood drive gear fixed to the wood shaft is always separated from the wood driven gear and arranged so as to mesh with the wood driven gear when rotated by the wood operation. In the kick starting device, a spacer is attached to the inner or outer periphery of the elastic spring to restrict the amount of displacement of the drive ratchet and the kick driven gear in the thrust direction to a small stroke necessary for the ratchet to disengage. A kick starting device featuring: