JPH029095Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a power unit case for a small two-wheeled motor vehicle, and more specifically, to a power unit case equipped with a kick starter device for a small two-wheeled motor vehicle.

Generally, by operating a pickup starter lever, a pickup starter device moves the pickup starter drive gear in its axial direction and meshes with the pickup starter driven gear, and rotates the crankshaft via the driven gear, thereby rotating the engine. This kick starter device is equipped with a stopper means for determining the stroke of the kick starter lever. Generally, this stopper means is constructed by forming a boss on a gear case, clutch case, etc. and utilizing this boss.

Incidentally, in a power unit case of a small motorcycle, a stud bolt is inserted between a gear case and a clutch case to reinforce the case.

The present invention utilizes this stud bolt to constitute a stopper means for the kick starter lever, thereby eliminating the bosses formed on the gear case, clutch case, etc., thereby reducing the weight of a small motorcycle. The purpose is to provide a unit case.

The present invention will be described below with reference to embodiments shown in the drawings. 1 and 2 show a kick starter device in a power unit case 1 of a small motorcycle according to the present invention. A power unit case 1 is formed by a gear case 2 forming a crank chamber of an engine and a clutch cover 3, and a kick starter device 4 is housed within the power unit case 1. In this hard starter device 4, a hard starter shaft 5 and an idler shaft 6 are connected between the gear case 2 and the clutch cover 3.
Pass and support the starter shaft 5.
A hard drive sprocket 7 is fixedly installed on the idler shaft 6, a hard starter lever 8 is fixed to the extending end of the shaft 5 that protrudes outward from the clutch cover 3, and a hard starter drive gear 9 is screwed onto the idler shaft 6. In addition to installing
Fixedly install the mechanical driven sprocket 10,
Furthermore, a chain 11 is wound between the drive sprocket 7 and the driven sprocket 10, and a kick starter driven gear 13 is secured to the end of the crankshaft 12. Furthermore, in this kick starter device 4, the kick starter shaft 5
gear case 2 located between and idler shaft 6
A stud bolt 14 is installed across the clutch cover 3 and the stud bolt 14 is fitted into the arc-shaped elongated hole 7a formed in the kick drive sprocket 7, and one end is secured to the kick starter shaft 5. While locking the other end of the return spring 15 wound around the shaft,
The end of the retainer 16 fitted to the kick starter drive gear 9 is engaged.

Below, the operation of the kick starter device 4 will be explained, and the configuration will also be explained in more detail. When the kick starter lever 8 is operated to rotate the kick starter shaft 5, the kick drive sprocket 7 is also rotated together with the shaft. When the sprocket 7 rotates, its rotational force is transferred to the chain 1.
1. The power is transmitted to the mechanical driven sprocket 10, and the idler shaft 6 is integrally connected to the sprocket.
is rotated. However, at this time, since the rotation of the kick starter drive gear 9 is prevented by the retainer 16, it is transferred to the gear case 2 side by the screwing action of the torsion spline 6a formed on the idler shaft 6, and is transferred to the gear case 2 side. It is screwed into the driven gear 13. Therefore, the operating force of the hard starter lever 8 is the same as that of the hard drive sprocket 7, the chain 11, the hard drive sprocket 10, the hard drive gear 9,
The signal is transmitted to the crankshaft 12 via the hard starter driven gear 13, causing the crankshaft to rotate. When the operating force of the kick starter lever 8 is released, the kick starter shaft 5 is returned to its original state by the biasing force of the return spring 15, and the kick drive sprocket 7 is accordingly rotated in the opposite direction. The rotational force is transmitted to the idler shaft 6 via the chain 11 and the mechanical driven sprocket 10, causing the shaft to rotate in the opposite direction. Therefore, the hard starter drive gear 9 is connected to the clutch cover 3.
Transferred to the side, the hard starter driven gear 13
turn away from Such operation is stopped when the edge of the arcuate long hole 7a of the quick drive gear 7 comes into contact with the stud bolt 14.

As described above, the power unit case for a small motorcycle according to the present invention utilizes the stud bolt installed to reinforce the case as a stopper means for determining the stroke 7 of the kick starter lever. Therefore, the weight can be reduced accordingly, and machining etc. can be omitted.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a kick starter device in a power unit case of a small motorcycle according to the present invention, and FIG. 2 is a conceptual longitudinal cross-sectional view showing the positional relationship of each element thereof. 1...Power unit case, 2...Gear case, 3...Clutch cover, 4...Kick starter device, 5...Kick starter shaft, 6...
Idler shaft, 7... Kick drive sprocket, 7a... Arc-shaped long hole, 8... Kick starter lever, 9... Kick starter drive gear,
10... Hard driven sprocket, 11...
Chain, 12... Crankshaft, 13... Hard starter driven gear, 14... Stud bolt, 15... Return spring, 16... Retainer.

Claims (1)

[Scope of utility model registration request] A power unit case for a small motorcycle equipped with a kick starter device, characterized in that a reinforcing stud bolt of the power unit case is used as a stopper means for determining the stroke of a kick starter lever. Case.