CZ31800U1 - A system of rotation drive via drive wheels with internal toothing - Google Patents

Description

Technical field

The technical solution belongs to the field of transport devices transforming the movement energy of persons into mechanical movement of machinery, especially bicycles, and it concerns the design of crank drive by hand or foot using an auxiliary transmission.

BACKGROUND OF THE INVENTION

Various designs of drive of land vehicles powered by human power are known in the art, in particular bicycle drives. The most commonly used is a conventional drive, where the pedal drive crank is rigidly connected to the drive wheel, the ratio of the pedal axis to the drive wheel radius being approximately 2: 1. This ratio is the limited efficiency of the drive mechanism. Several improvements are known in the art to increase the efficiency of a conventional drive.

Known is the solution according to SK 5004 U, which solves an adjustable pedal crank to increase the torque at the same force acting on the pedal.

The solution according to PV 2006-65 CZ enables the drive of the bicycle by means of a lever mechanism with freewheels with a rotary return mechanism.

A solution according to UV 29592 CZ is known in which the force effect on the cranks is increased by means of an added force arm.

The solution according to the technical solution US 2016144927 uses a drive lever for driving, which also serves as a control mechanism.

The essence of the technical solution

These disadvantages of the prior art are partially eliminated by a rotary drive system via internally toothed gears, characterized in that prior to transmitting a power with a variable or immutable transmission ratio using an endless chain or endless belt or other transmission, a rotary transmission over the drive gears is upstream. internal gear wheels for driven gear wheels.

A solution is advantageous in which the drive axle is rotatably mounted in the bearings, at the ends of which the guards with internal toothed gear wheels are mounted and the driven axle is rotatably mounted in the bearings on which the drive wheel of the rotary drive is mounted.

At the ends of the driven axle, driven gear wheels are mounted. The drive axle and the driven axle are at a distance relative to each other to engage the internally toothed drive gears with the driven gears. A pedal is attached to each cover on the outside. The pedals are positioned symmetrically with the drive axis and form an angle of 180 degrees around the drive axis.

This design makes it possible to achieve a longer crank arm than is commonly used, in particular in the construction of bicycles. As the arm of the force is increased, the torque and thus the overall power of the drive increases with unchanged force.

- 1 GB 31800 U1

Clarification of drawings

A specific embodiment of this technical solution of the rotary drive system via internal gear drive wheels in a bicycle drive embodiment is shown in the accompanying drawings, in which Fig. 1 is a partial longitudinal section of the bicycle drive and Fig. 2 is a partial sectional perspective view of Fig. 1.

Examples of technical solutions

The technical solution will be explained in more detail below using an example of using a rotary drive system via internal toothed wheels for driving a bicycle. The drive is shown in Figures 1 and 2.

In the bicycle frame 1, a drive axle 72 is rotatably mounted in the bearings 41 and 44, at the ends of which the covers 61 and 62 are fixed, to which the internal toothed wheels 21 and 22 are mounted with an offset in the direction of the frame. Attached to the covers 61 and 62 from outside are pedals 51 and 52 disposed symmetrically with respect to the drive axis 72 and forming an angle of 180 degrees around the drive axis 72. The internally toothed wheels 21 and 22 engage driven gear wheels 31 and 32 mounted at the ends of the driven axle 71, which are rotatably supported in bearings 42 and 43 mounted in the bushes of the T frame. the power transmission to the driven sprocket, not shown in the drawings, and subsequently to the driven rear wheel of the bicycle shown in FIG. 2. The solution according to the present example achieves an increase in the power of the drive. more torque, which is further increased by the gearing and then by the chain drive to the driven rear wheel of the bicycle.

Industrial applicability

The rotary drive system via the internal gear drive wheels of the present invention can be used, in addition to the example, also for other hand or foot-driven rotary drives, for example, a water wheel propeller, a light Delta propeller, a hang glider, and others.

PROTECTION REQUIREMENTS

Claims (3)

A rotary drive system via internal gear drive wheels, characterized in that prior to transmitting a power with a variable or immutable gear ratio using an endless chain or endless belt or other transmission, a rotary transmission over the drive gears (21 and 22) is preceded by internal toothing to driven gears (31 and 32). Rotary drive system via internal gear drive wheels according to claim 1, characterized in that a drive axle (72) is rotatably mounted in the frame (1) in the bearings (41a 44), at whose ends the covers (61a 62) are fastened. with internally toothed drive gears (21 and 22) and bearings (42 and 43) rotatably mounted on the driven axle (71) on which The rotary drive gear wheel (8) of the rotary drive is fastened and at its ends driven gear wheels (31) and (32) are fixed, wherein the drive axis (72) and the driven axis (71) are spaced apart to engage the gear teeth. sprocket wheels (21a 22) with driven sprockets (31a 32), with a cover (61) 5, the pedal (51) is mounted on the outside, the pedal (52) is mounted on the housing (62) from the outside and the pedals (51 and 52) are symmetrical to the drive axle (72) and form an angle 180 around the drive axle (72). degrees.