Almost all designs drive bikes have a common drawback that reduces their efficiency. This defect is uneconomical expenditure of muscular energy in the change efforts from one foot to the other during the passage of the pedals ‘dead spots’ (the vertical position of the connecting rod). A large part of the muscular effort at this point is directed to the axis of rotation of the pedals and not so much does the useful work, how much increases the wear of the bearings of the carriage. No wonder the cyclists before the withdrawal of the rods from the vertical position. As a result the course begins with partial loss of muscular energy, which causes premature fatigue of the cyclist.
The proposed improvements to the Cycling of the drive addresses this shortcoming, allowing fans travel far to go economically, rationally using muscular energy, spending it almost as during normal walking.
For this purpose, the design of the drive is used, the device interrupts the interaction of the connecting rod from the drive sprocket to ensure the free and rapid passage crankset with pedals sectors near the “dead spots” due to the inertia.
General view of the structure of the drive bike with an inertia breaking device shown in figure 1, where the connecting rods 1 (with pedals) mounted on a carriage shaft 2 have a movable (sliding) connection with the drive sprocket 3 by the interaction of the studs made on the sleeve 4 mounted on the right crank, and the Diametric grooves on the leading sprocket 3. The slots allow the connecting rods to move quickly through an ineffective area, and a spiral spring bending 5 — softens the blow at the end of their free play.
Economical veloplivd:
1—modified right connecting rod with the pedal; 2 — the shaft of the carriage; 3—improved sprocket chain transmission; 4 — bushing (steel 30KHGSA, round 55); 5 — torsion spring (carbon wire Ø 5); 6 — limiter spring (soft wire Ø 4); 7—drive chain; 8—driving sprocket; 9 — wedge mounting rod on the shaft; 10—guiding plate (steel, sheet s3); 11 —fastening the washers to the bushing (M4 screw, 3 pieces); 12 — bottom bracket.
As can be seen from the figure the drive constructive change is only subjected to connecting the drive sprocket with the right rod, so this drive can be made on any model of bike.
This is made of steel 30KHGSA bushing with protrusions according to the drawing, Fig. 4, which is welded to the rod, remove carriage shaft and modified in accordance with drawing Ref. 1. Sprocket is also finalized — there are grooves under the tabs of the sleeve. The spring is made “cold” made of carbon wire with a diameter of 4 to 5 mm and contains one incomplete revolution. The ends of the spring to bend in the home after heating the places of bending of the wire over a gas burner. The guiding washer 10 is manufactured according to the drawing of steel.
When installing the sprocket in its slots are inserted into the spines of the sleeve 4, on which is mounted a washer 10 with three M4 screws. The limiter 6, made of soft wire and secured to the leading sprocket by bending the ends of her jumper-rays, prevents the waste from the plane of the sprocket of the spring coil in its stressed state during operation. Further, the right connecting rod 1 from the drive sprocket in the usual way is fixed on the shaft 2 Dobby unit of the bike with the help of the wedge 9. When you install the springs one end is mounted in a suitable opening in a leading asterisk, and the other curved end wraps around the rod near the pedal.
The extension adjustment of the spring force 5 on the leading asterisk is additionally drilled a series of holes the diameter of wire to be installed in their bent end of the spring.
The drive works in the following way. In the initial period, e.g. during the installation of the right foot on the right pedal in the upper position, the rods 1 together with the shaft 2 and the sleeve 4 are rotated until interaction of the spike of the bushing with the drive sprocket 3 and the spring 5 is compressed and creates a torque on the leading star. After application of muscular force to the right pedal sprocket is driven in rotation and the bike accelerates. When approaching the right pedal to bottom position aborts interaction of the connecting rod (thorn Bush) from the drive sprocket by delaying the rotation of the connecting rod relative to the drive sprocket after the reduction of pressure on the pedal due to the inverse action of the spring and the inertial motion of the bike. While the spring supports the rotation of the sprocket and removes it from interference with the connecting rod. As a result, in the beginning of the next work cycle, the cranks pass the vertical position of the region with some reverse angular offset relative to the drive sprocket, which provides free transition vertical position and another accumulation of the spring for the left crank. Next, the process operation is repeated.
Easy transition pedals extreme upper and lower provisions preclude loss of muscular energy when you change the cycles of their work, which improves drive efficiency. In steady state there is a delay of rotation of the crankset, and then they are effectively pushing the leading asterisk. As a result, the rotation of the pedals is economical in “pusher” mode. This mode allows you without excessive efforts and long time to maintain a high speed, such as to maintain rotation of the flywheel intermittent tangential force. The delay of rotation of the connecting rod contributes to compensation of the inertial forces acting on the legs of a cyclist in the area of “dead spots” in their fast rotational movement.
On the economy and stability of the actuator is affected by the force accumulation of the spring, which is selected depending on the mass and physical fitness of the cyclist. If, after the working stroke of the connecting rods are diverted from the drive sprocket it is necessary to install a firmer spring. Conversely, if the transition to the free pedal top position it is applied to the visible muscular effort and in the course of working is no working relationship of the connecting rod from the drive sprocket, then the elasticity of the springs must be reduced. This can be done by selecting the diameter of the spring wire.
For normal operation, drive the reciprocal movement of the cranks must be less than their initial angular displacement. Under these conditions, transient operation is supported by an initial torque to the leading asterisk, which further enhances the damping properties of the spring to smooth out peak loads when the pusher rotation of the drive sprocket.
During the development of Cycling with this drive for a cyclist requires a specific attention for monitoring the uniformity of the rotation of the drive sprocket with the free swing of the connecting rod. If you receive certain skills the uniformity of rotation of the drive sprocket and the reciprocal movement of the connecting rod are supported automatically and do not present any difficulty and discomfort.
Experimental trials within 3500 km confirmed the efficiency and reliability of the drive. Compared to a regular bike reduces fatigue on long trips, allowing a cyclist.
Perhaps the springing of the pedals relative to the drive sprocket can also take its place in the big sports, like the springing back of the blades relative to the heel of a Jogging Shoe skates.
V. ZELENOV, Voronezh
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Almost all designs drive bikes have a common drawback that reduces their efficiency. This defect is uneconomical expenditure of muscular energy in the change efforts from one foot to the other during the passage of the pedals ‘dead spots’ (the vertical position of the connecting rod). A large part of the muscular effort at this point is directed to the axis of rotation of the pedals and not so much does the useful work, how much increases the wear of the bearings of the carriage. No wonder the cyclists before the withdrawal of the rods from the vertical position. As a result the course begins with partial loss of muscular energy, which causes premature fatigue of the cyclist.