JPH0325667B2 - - Google Patents

Description

[Detailed Description of the Invention] Normal differential gear mechanisms have side shafts that protrude outward on both sides to ensure smooth operation of the rear wheels of the vehicle, but the present invention utilizes this double-speed rotation principle. This is adopted as an increase/decrease mechanism, and to explain this in detail with reference to the drawings, there are a side gear 3, which is interlocked with a gear case 1 of a differential gear via small gears 2, 3.
One shaft of 3 is a hollow shaft 4, and the other shaft 5 of the side gear shaft is extended into the inside of the gear case 1, passes through the hollow shaft 4, and both shafts protrude in the same direction. A prevention ratchet 6 (for example, a bicycle free mechanism) is intervened, and a ratchet blade 7 attached to the hollow shaft 4 side and a pawl 8 supported on the other shaft 5 side are used to cause both shafts to rotate together in the normal rotation direction. A brake mechanism 9 (for example, a bicycle band brake) is provided on the other shaft 5 so that the bicycle can be stopped. In this way, when the driving force is transmitted to the large sprocket 10 to rotate the gear case 1 (for example, by interlocking the petal input with a chain, etc.), the large sprocket 10 is transmitted to the small gears 2 on both walls,
2. It is interlocked with the hollow shaft 4 and the other shaft 5 via the side gears 3, 3. When a load (for example, a bicycle wheel hub axle) is connected to the hollow shaft 4, the other shaft 5 tries to idle at double speed, but this is blocked by the ratchet 6 and the other shaft 5 and the hollow shaft 4 rotate together. Now, when the lever 11 of the brake mechanism 9 of the other shaft 5 is pulled and the shoe 12 is applied to the drum 13, the hollow shaft 4 rotates at double speed, so that the small sprocket 14 can be increased or decelerated depending on whether or not the brake mechanism 9 is activated. can be carried out freely. If this mechanism is used in succession, any number of stages can be increased or decreased. It is also possible to butt the two shafts together at the center of the gear case and provide a reversal prevention ratchet at the center, but due to the narrow space, we have shown this example. , a reversal prevention ratchet may be provided.

In this way, the present invention enables speed change in any transmission mechanism simply by operating the brake, and can be used in multiple stages by stacking several stages, and can be manufactured as a unit from at least one piece. Of course, it has a wide range of uses in automobiles.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of the present invention, Fig. 2 is a partially cutaway front view, Fig. 3 is a perspective view of the present invention when used on a bicycle, and Fig. 4 is a system diagram showing how the invention is assembled in multiple stages. FIG. 5 shows another embodiment. 1... Gear case, 2... Small gear, 3... Side gear, 4... Hollow shaft, 5... Other shaft, 6...
... Ratchet, 7... Ratchet blade, 8... Claw,
9... Brake mechanism, 10... Large sprocket,
11...Lever, 12...Show, 13...Drum, 14...Small sprocket.

Claims (1)

[Claims] 1. In a differential gear device of the type in which opposing pinion gears that mesh with both side gears are supported inside a gear case with a side gear shaft protruding from both sides, the side gear axis position of the common shaft of the pinion A through hole is provided, one of the side gear shafts is made a hollow shaft, and the other side gear shaft is extended to pass through the hole and the hollow shaft portion so that both side gear shafts protrude concentrically to the same side of the gear case. This transmission has a structure in which a ratchet mechanism to prevent reverse rotation is interposed between the shafts, a brake device is provided on one side gear shaft, and the other side gear shaft is interlocked with the gear case of the next stage, so that the necessary number of stages are overlapped.