JPH018479Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a bicycle drive device that can be easily attached to a normal bicycle to create a motorized bicycle.

An example of this invention will be explained with reference to the drawings.
In FIGS. 1 and 2, reference numeral 1 denotes a fixed frame, which can be installed above the mudguard of the rear wheel of the bicycle in place of a cargo platform by cutting out the center part of the mudguard. That is, it is made in the shape of a narrow loading platform with left and right mounting ears 2, 2 at the front end, and mounting leg pieces 3, 3 are provided to protrude downward. Further, the rear part of the upper surface is curved upward, and a mounting hole 4 to be connected to the mudguard is provided at the rear end. Furthermore, a horizontal shaft 5 is attached to protrude from both sides, so that a hanging plate, which will be described later, can be attached thereto. Reference numeral 6 denotes a splicing piece for fixing the lower end of the mounting leg piece 3 to the vehicle body frame. Note that a frame plate may be provided on the fixed pedestal 1 to serve as a loading platform.

Next, 7 is a hanging plate made in an inverted L shape,
A pipe 8 to be fitted to the horizontal shaft 5 is welded together with a pulley cover at a proper position on the upper part, and the pipe 8
An engine mounting hole 9 is provided at the lower front of the engine mounting hole 9, a notch 10 for mounting a friction axle, and a hole 11 for mounting a spring are provided at the rear of the engine mounting hole 9, and a clutch lever 12 is fixed to the upper edge in advance in a direction facing forward. has been done.

A friction wheel 13 is attached to the hanging plate 7 at the rear thereof and an engine 14 is attached to the front thereof through the attachment hole 9 and the notch 10. The friction wheel 13 consists of a hollow cylinder made of a perforated plate, a pulley 15 is fixed to one side, and a shaft 16 in the center is threaded at one end.
is attached to the shaft 16 so that it can rotate freely and cannot be pulled out. After the bearing fitting 17 fitted to the shaft 16 is engaged with the notch 10, the nuts 18 and 17 are tightened, and the hanging plate 7 is attached to the rear side. Supported. Next, the engine 14 is a normal small engine, and is attached to the front lower outer surface of the hanging plate through the engine mounting hole 9 on the side opposite to the friction wheel 13 so that its center of gravity is located below the fixed frame 1. The rotating shaft extends through the hanging plate 7 and projects toward the friction wheel 13. A drive pulley 20 is provided at the tip of the protruding rotating shaft, and the pulley 15 of the friction wheel 13
The V-belt 21 is installed over the entire length. Furthermore, a spring 22 is attached to the rear end of the hanging plate 7.
Its tip can be fixed in place on the vehicle body.

This invention has the above-mentioned structure and is used by being attached to an ordinary bicycle as shown in FIG. That is, the center part of the mudguard of the rear wheel of the required bicycle is cut out, and the fixed frame 1 is placed above it in place of the cargo platform.
After fixing to the vehicle body via the mounting ears 2, 2 and mounting leg pieces 3, 3, and connecting the rear end to the front end of the rear half of the mudguard through the mounting hole 4, the friction wheel 1 is attached in advance.
3. Suspend the hanging plate 7 to which the engine 14 etc. are attached by inserting the horizontal shaft 5 into the pipe 8, and hang it with the spring 22.
Stretch it out and fix its lower end to the vehicle body,
By pressing the friction wheel 13 against the upper surface of the rear wheel, the rotation of the engine 14 can be transmitted to the rear wheel via the friction wheel 13, and by pushing down the clutch lever 12, the friction wheel 13 can be moved against the spring 22. can be pulled away from the rear wheels. In addition,
Numeral 23 is a locking piece for holding the clutch lever 12 in a separated state, and if it is provided on the left and right sides along with the horizontal shaft 5, it is convenient to attach the hanging plate 7 to either the left or right side.

As described above, this invention locates the center of gravity of the engine below and drives the friction wheel by pressing it against the outer periphery of the rear wheel from above. The conventional cantilever type, in which the tip is pivoted to the car body, the engine and friction wheel are installed at the rear end, and the reduction of the friction wheel is solely due to its own weight, causes the car body to move up and down violently on uneven roads. In this case, the engine and friction wheel act as a weight and move separately from the vehicle body, which could cause the friction wheel to spin, but this problem does not occur with this invention. In this invention, in particular, the hanging plate 7 on which the friction wheel 13 is pivoted is suspended below the fixed frame 1, the engine is attached to this, and the part between the friction wheel 13 and the engine 14 is fixed. Since the friction wheel 13 is pivoted to the vehicle body in an almost balanced manner via the horizontal shaft 5 provided on the mount 1, and the friction wheel 13 is pressed against the rear wheel only by the force of the spring 22,
The center of gravity of the engine is always below the upper wheels.
Even when the vehicle body suddenly moves up and down, there is no fear that the hanging plate 7 will jump independently due to the action of the spring 22. Therefore, there is stability in steering and running, and since the connection between the engine 14 and the rear wheels can be completely separated at any time by pushing down the clutch lever 12, the connection between the engine 14 and the rear wheels can be completely disconnected at any time, such as when starting the engine or This is advantageous when going down a long slope. Furthermore, if the hanging plate 7 is removed, the bicycle can easily be turned into a normal bicycle, and has many other advantages.

[Brief explanation of drawings]

FIG. 1 is a perspective view, FIG. 2 is an exploded perspective view of each part, and FIG. 3 is a side view of the device attached to a bicycle. Codes in the figure: 1 is a fixed frame, 5 is a horizontal axis, 7 is a hanging plate, 8 is a pipe, 9 is an engine mounting hole, 10 is a notch, 12 is a clutch lever, 13 is a friction wheel, 14 is an engine, 22 is a Showing a spring.

Claims (1)

[Scope of utility model registration request] The mudguard center part of the rear wheel of the bicycle is removed, and above it there is a fixed frame 1 that is attached to the bicycle body in place of the bicycle carrier. It consists of a hanging plate 7 which is swingably supported by a shaft and whose rear end is constantly pulled downward by a spring 22. Furthermore, the hanging plate 7 has a circumferential surface in advance on its rear inner surface sandwiching the horizontal shaft 5. A friction wheel 13 made of a hollow cylinder made of a perforated plate to be pressed against the rear wheel, an engine 14 whose center of gravity for rotating the friction wheel 13 is located below the fixed frame 1 on the front lower outer surface, and an upper edge. This bicycle drive device is provided with clutch levers 12 which protrude forward from each other and which raise the rear end of the hanging plate 7 against a spring 22.