DE202007010353U1 - Cam controlled crank drive for bicycles - Google Patents

Abstract

mechanics for bicycle drives by means of a cam-controlled crank drive. characterized, that the Tretarmlängen over a curve out Extend the procedure accordingly and thus a power saving is achieved.

Description

in this connection is about a new drive for bicycles.

Of the in claim 1 protection invention is based on the problem an additional optimization to get from bicycle drives.

This is achieved by a muscle-powered crank drive, being the actual pedal guide this moves on an oval orbit. The pedal guide will Here, by means of a curve, cam-controlled and has during the rotational movement, up as well as down, a radius of rotation of about 170 mm as in a conventional Bicycle. The eccentric is achieved by offsetting the cam drive center around 80 mm. At a pedal crank length of 170 mm you come to a translation from 1.47. This corresponds to a length of 250 mm.

With This invention is achieved that in this drive the cyclist when passing in the downward movement of the respective pedal a higher Torque can apply - at same number of revolutions.

Of the optimal movement of the legs and the tread is thereby hardly changed, and thus also does not affect the human continuous performance.

These Mechanics have the advantage that the effort is very much lower than in a normal drive or at full power higher Tempo can be achieved.

The translation is due to the eccentric or by the offset of the drive center reached by 80 now, here are the pedal crank arm lengths respectively during the downward movements changed forward in the direction of travel accordingly.

Around In this case, to have low friction losses, all movements are almost over maintenance-free ball bearings. Here are the pedal guides using cam rollers in the orbits and the pedal crank extensions via linear guides realized.

This Drive can be practically before every bicycle drive (crank drive), independently with which number of sprockets the bike is equipped, upstream.

For this Mechanics need the frames are made or altered accordingly. A conversion kit would be for later too conceivable.

The Sample production is already completed and has shown that such drives are functional are.

Design and Production drawings and a sample model already exist.

• 1. Bei Lasträdern wie z.B. bei den Botenrädern.
• 2. Bei Gepäckrädern allgemein.
• 3. Bei Tretbootantrieben.
• 4. Bei Rikschas.
• 5. Bei Liegerädern.
• 6. Bei Hallen -Rennräder.
• 7. Bei Sonderanfertigungen wie z.B. bei Freizeiträdern.

Since the efficiency lies in saving the available power, these drives are mainly used in the following areas.

• 1. For load wheels such as the messenger wheels.
• 2. For luggage wheels in general.
• 3. For pedal boat drives.
• 4. With rickshaws.
• 5. For recumbents.
• 6. At indoor racing bikes.
• 7. For custom-made products such as recreational bicycles.

at the open cam roller execution However, there is a risk of contamination in this area, but is largely compensated by appropriate measures.

The execution The invention will be completed with reference to drawings and figures.

It demonstrate:

Drawing B1.1 v.6 1 The normal conventional bicycle (road bike)

Drawing B1.2 v.6 2 Right side view, frame construction changed for protection claim 1

Drawing B1.3 v.6 3 View right side with protection claim 1

Drawing B1.4 v.6 4 View left side with protection claim 1

Drawing B1.5 v.6 5 Top view of the mechanism for protection claim 1

Drawing B1.6 v.6 6 Suspension of the mechanism for protection claim 1

The execution The invention will be explained with reference to figures and pos.

It demonstrate.:

1 The normal conventional bicycle

2 ( 1 ) Cam, ( 18 ) changed frame (structure).

3 ( 1 ) Cam, ( 2 ) Cam roller, ( 3 ) Linear guide rollers, ( 4 ) Dirt cover, not shown.

( 5 ) Guide rail, ( 7 ) Spacers, ( 10 ) Guide plate, ( 13 ) Pedal right, ( 19 ) Bottom bracket axle.

4 ( 1 ) Cam, ( 2 ) Cam roller, ( 3 ) Linear guide rollers, ( 4 ) Dirt cover, not shown.

( 5 ) Guide rail, ( 7 ) Spacers, ( 10 ) Guide plate, ( 14 ) Pedal left. ( 19 ) Bottom bracket axle.

5 ( 1 ) Cam, ( 2 ) Cam roller, ( 3 ) Linear guide rollers, ( 4 ) Dirt cover, not shown.

( 5 ) Guide rail, ( 6 ) Scar left, ( 7 ) Spacers, ( 8th ) Fixing strut, ( 9 ) Clamping piece, ( 10 ) Leadership, ( 11 ) Strip, ( 12 ) Bottom bracket, ( 13 ) Pedal right, ( 14 ) Pedal left, ( 19 ) Bottom bracket axle, ( 20 ) Scar on the right, ( 21 ) Sprocket.

6 ( 15 ) Fixing strut, ( 16 ) Fixing strut, ( 17 ) Fixing strut, ( 18 ) Bicycle frame, ( 19 ) Bottom bracket axle, ( 7 ) Spacers, ( 8th ) Fixing strut.

The structure of the mechanics is explained below:
On each side of the bike, an oval cam is made by means of spacers ( 7 ) via mounting struts 6 with pos. 8th ) 15 ) 16 ) 17 ), on the bicycle frame ( 18 ) with a center offset to the bottom bracket of 80 mm. Here, the open side of the curve is on the opposite side of the bike.

On the bottom bracket axle ( 19 ) is a guide plate ( 10 ) by scar ( 6 ) and ( 20 ) fixed axially with a commercially available crank screw.

The linear guide rollers ( 3 ) with the guide plate ( 10 ) mounted in the longitudinal direction.

In the linear guide rollers ( 3 ) run the guide rails ( 5 ) with each pedal movement in or out accordingly. Is the pedal ( 13 ) on the right side is fully extended, the pedal ( 14 ) retracted on the left side according to the curve. The bar ( 11 ) is with the guide rail ( 5 ) and serves as reinforcement. The cam rollers ( 2 ) with the guide rails ( 5 ) so that the rollers come to bear in the respective curve. The cam rollers ( 2 ) are secured by means of clamping against unintentional release.

Claims (6)

Mechanics for bicycle drives by means of a cam-controlled crank drive. characterized in that the Tretarmlängen extend accordingly over a curved run accordingly and thus a power saving is achieved. Mechanism according to claim 1, characterized that the pedal guide guided by an oval curve becomes. Mechanism according to claim 1, characterized that all movements over Ball bearing executed are, and thus a slight friction loss occurs. Mechanism according to claim 1, characterized that for the rotation movements cam rollers and for pedal arm extension Linear guides used become. Mechanism according to claim 1, characterized that this is practically a primary gearbox and, if necessary, restored to the normal state with appropriate changeover arms can be. Mechanism according to claim 1, characterized that this type of mechanics, in special cases, as well as in many muscle-powered crank mechanisms can be used.