JPH0114764Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a kick starting device for a two-wheeled motor vehicle, which transmits the rotation of a jackshaft caused by a kick operation to a crankshaft.

Figure 1 shows an example of a kick starting device for a motorcycle.
Shown in Figure 2. Figure 1 shows the transmission system, crankshaft 1
The rotation is transmitted to the rear wheel via the drive gear 2, driven gear 3, friction clutch 4, counter shaft 5, transmission gear train 6, to the drive shaft 7, and then via the drive sprocket gear 8 and chain 9. As shown in FIG.
A hard drive gear 12 is rotatably supported on the upper part thereof, and is always meshed with one gear 13 of the speed change gear mechanism 6. A dog 14a is provided on the side surface of the kick drive gear 12, and a dog 14b facing the dog 14a is mounted on the kick shaft 11 by a helical spline 15. When the torque shaft 11 is rotated by operating the torque lever 10, the dog 14b rotates together and moves in the axial direction by the helical spline 15, and is coupled to the dog 14a to drive the torque drive gear. Then, the crankshaft is driven through the gear 13 and other gears that are in mesh with each other, and the engine is started.

A coiled return spring 16 is loaded onto the shaft 11. The return spring 16 is wound around the outer periphery of the shaft hole boss 18 of the shaft 11 which is protruded from the inner surface of the case 17, and has its base end 16a fixed to the case 17 and its distal end 16a.
6b is fixed to the shaft 11 and loaded. In this case, the installation space for the return spring 16 is extremely narrow. That is, the shaft 11 is mounted on a shaft near the speed change gear mechanism 6, and the return spring 1
One of the gears 19 rotates close to the outer periphery of the gear 6.
Depending on the magnitude of deformation and vibration when the return spring 16 is in operation, there is a risk of interference with the gear 19 and damage. Decreasing the outer diameter in order to avoid this is not preferable since it may tighten the shaft hole boss 18 during operation and reduce its function.

The purpose of this invention was to improve the above-mentioned points, and the purpose of this invention was to improve the safety of motorcycles by preventing the return spring from coming closer than a certain distance to the transmission gear mechanism due to vibrations, etc. Provide starting device.

An embodiment of this invention is shown in FIGS. 3 and 4.

Similarly, the shaft 11 is pivotally supported by a shaft hole boss 18 protruding from the inner surface of the case 17, and a return spring 16 is elastically mounted on the outer periphery of the shaft hole boss 18.

The drive shaft 7 is located at the base of the shaft hole boss 18.
An eccentric cylindrical enlarged portion 20 is provided on the opposite side.
The enlarged portion 20 has a protruding side end and a return spring 16.
The size is set so that there is still a slight gap between the inner diameter and the inner diameter.

The presence of this eccentric enlarged portion 20 prevents the return spring 16 from being displaced in the direction of the drive shaft 7 due to deformation or vibration during operation.
The drive shaft 7 is blocked to a certain limit and approaches the drive shaft 7.
Prevent interference with upper gear 19.

As described above, the kick starting device for a motorcycle according to this invention has a simple structure in which an eccentric cylindrical enlarged portion is provided at the root of the shaft hole boss around which the coiled return spring of the jack shaft is wound. , limits the displacement of the return spring, eliminates interference with adjacent gears, and prevents damage and accidents.
There is no problem with the function of the return spring during normal operation, and the maintainability of the kick starting device is improved. Additionally, since the displacement of the return spring is guaranteed, it is possible to set the clearance between adjacent gears, etc., making it possible to make the kick starting device more compact and shorten the distance between the shafts of the push shaft and the drive shaft. This has the effect of reducing the size of the case, making it lighter and reducing costs.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing an example of a transmission system of a two-wheeled motor vehicle, Fig. 2 is a longitudinal sectional side view illustrating a kick starting device, and Fig. 3 is a longitudinal sectional side view of main parts showing an embodiment of this invention. FIG. 4 is a sectional view taken along the line A-A in FIG. 1... Crankshaft, 5... Counter shaft, 6...
Speed change gear mechanism, 7...drive shaft, 10...tight lever, 11...tight shaft, 12...tight drive gear, 14a, 14b...dog clutch, 15...helical spline, 16...
Return spring, 17...Case, 18...
Shaft hole boss, 20... Ampulla.

Claims (1)

[Scope of utility model registration request] In a kick starting device equipped with a screw shaft that is adjacent to and parallel to the gear train of a variable speed gear mechanism, the base of the shaft hole boss of the screw shaft that protrudes from the inner surface of the case is eccentrically located on the opposite side of the gear train with respect to the shaft center of the screw shaft. 1. A kick starting device for a two-wheeled motor vehicle, characterized in that a cylindrical enlarged part is provided, and a fixed end of a stiff shaft return spring, which is loaded between a jack shaft and a case, is located on the outer periphery of the enlarged part.