JPH04328087A - Pedal driving gear for bicycle with prime mover - Google Patents

Abstract

PURPOSE:To obtain a pedal driving gear for a bicycle with a prime mover whereby maintainability of an engine can be ensured and chains can be arranged in a high position and prevented from being easily stained by providing an idle shaft in an upper side of the engine, and arranging the primary chain in a left side of the engine and the secondary chain in a right side of the engine. CONSTITUTION:A primary chain 9 is connected to a pedal crankshaft 6, traversed through a front lower part of an engine 1, in a left side thereof and to a left end of an idle shaft 8 traversed through a rear side of a carburetor 7 in the upper of the engine 1, and a secondary chain 13 is connected to a right end of the idle shaft 8 in a right side of the engine 1 and to a right end of a rear wheel axle 11 through a one-way clutch 12.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a petal drive device for a motorized bicycle.

0002

BACKGROUND OF THE INVENTION In some countries, motorcycles that use a small engine to drive the rear wheels are required to be able to drive the rear wheels even with a pedal. When driving the rear wheels with a small engine, a power unit with a drive device integrated with the engine is often used, and the power unit is installed on one side of the rear wheels. For this reason, the petal-driven chain is connected to the rear axle through the side opposite the power unit. For example, see Japanese Utility Model Application No. 56-102789 and Japanese Utility Model Application No. 59-167789.

0003

[Problem to be Solved by the Invention] In order to pass the petal drive chain to the opposite side of the power unit, it is necessary to avoid the lateral protrusion of the engine crankshaft, so that the chain passes underneath. The arrangement of the chain is difficult, and there is an inconvenience that the chain gets muddy and dirty.

In view of this, the present invention provides an idle shaft above the engine, places the primary chain on the left side of the engine, and the secondary chain on the right side of the engine, thereby ensuring maintainability of the engine. To obtain a petal drive device for a motorized bicycle in which the chain can be placed at a high position and is difficult to get dirty.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the motorized bicycle petal drive device of the present invention has the following features:
Connect the primary chain on the left side of the engine to the petal crankshaft that runs horizontally through the front lower part of the engine, connect the primary chain to the left end of the idle shaft that runs above the engine behind the carburetor, and connect the primary chain to the left end of the idle shaft that runs above the engine behind the carburetor. A secondary chain is connected to the right end of the rear wheel axle, and the secondary chain is connected to the right end of the rear wheel axle via a one-way clutch.

[0006]

[Operation] Since the idle shaft is located above the engine and behind the carburetor, the carburetor and air cleaner can be easily maintained. The idle shaft is located above the engine, and both the primary chain and the secondary chain can be placed at a high position, making it difficult to get dirt from road mud.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be explained with reference to FIGS. 1 to 3. The engine 1 is placed in front of the rear wheels 2, and the power unit 3, which has a drive unit integrated with the engine 1, is placed on the left side of the rear wheels 2 so that the engine 1 can drive the rear wheels 2. It is set as.

[0008] At the front lower part of the engine 1, there are petals 4 at both ends.
The petal crankshaft 6 with the crank 5 attached is passed through it sideways. Then, above the engine 1, the idle shaft 8 is disposed laterally so as to protrude to the rear side of the carburetor 7. The left side of the petal crankshaft 6 and the left end of the idle shaft 8 are connected by a primary chain 9. A tensioner 10 is installed below the primary chain 9.
is provided. The idle shaft 8 connects the right end of the engine 1 and the right end of a rear wheel axle 11 to which the rear wheel 2 is fixed, via a one-way clutch 12 and a secondary chain 13. An air cleaner 14 connected to the carburetor 7 is arranged outside the secondary chain 13.

By rotating the petal 4 with the foot, the primary chain 9 is driven, the secondary chain 13 is driven through the idle shaft 8, the rear wheel axle 11 is rotated through the one-way clutch 12, and the rear wheel 2 is rotated. You can run by driving. When the engine 1 drives the rear wheels 2 via the power unit 3, the one-way clutch 12 is idle. The carburetor 7 and the air cleaner 14 can be maintained without being obstructed by the primary chain 9 and secondary chain 13.

0010

As explained above, since the present invention is configured as described above, the primary chain and the secondary chain connecting the petal crankshaft and the rear wheel axle are connected by the idle shaft disposed above the engine. It can be placed on the left or right side of the engine, making it easier to maintain the engine's carburetor and air cleaner. Furthermore, the primary chain and the secondary chain can be placed at a high position where they are less likely to get mud, thereby reducing dirt.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a side view showing an embodiment of the present invention.

FIG. 3 is a longitudinal sectional plan view of a petal drive system showing an embodiment of the present invention.

[Explanation of symbols]

1 Engine 6 Petal crankshaft 7. Vaporizer 8 Idle axis 9 Primary chain 11 Rear wheel axle 12 One-way clutch 13 Secondary chain

Claims (1)

[Claims] Claim 1: A primary chain is connected on the left side of the engine to a petal crankshaft that passes horizontally through the front lower part of the engine,
The primary chain is connected to the left end of the idle shaft that passes horizontally behind the carburetor above the engine, the secondary chain is connected to the right end of the idle shaft on the right side of the engine, and the secondary chain is connected to the right end of the rear wheel axle via a one-way clutch. A petal drive device for a motorized bicycle characterized by connecting a second chain.