Pedal drive (versions)

FIELD: transport.

SUBSTANCE: invention relates to bicycles with pedal drive crank mechanisms that comprises levers of self-adjusting length that run along elliptic trajectory or other noncircular rotational trajectory. Pedal drive with chain or belt transmission comprises pinion frame 1 with its first end coupled with shaft of carriage 2, lever 3 with pedal 4 rigidly fixed with sun gear 5, stationary gear 6 with gear ratio of 2:1 with respect to sun gear 5. Stationary gear 6 is fixed relative to bicycle and coupled with sun gear 5 by chain or belt transmission. Second end of pinion frame 2 is articulated with sun gear 5 at the point shifted from its center while stationary wheel 6 features shape other than circle.

EFFECT: reduced drive forces due to mismatch between passing top dead center and bottom dead center of pedals.

4 cl, 4 dwg

 

The invention relates to a device for actuating vehicle by the muscular energy of the person, including, for rental for people with disabilities

Known pedal drive [description of the invention to the patent of Russian Federation №2068364, IPC-6: PM 1/02; publication date: 27.10.1996]containing the drive sprocket rigidly mounted on the shaft of the carriage is connected by means of the chain drive driven sprocket mating with sprocket wheel, the first stage actuator is made of two planetary gears with the carrier and rigidly connected with the shaft of the carriage which is freely mounted on the protruding ends of the satellites, meshed with a gear ratio equal to one, with a sun gear units mounted concentric with the shaft of the carriage with two sides and still relatively the exterior of the vehicle, and a pedal mounted on the rear ends of the horizontal levers rigidly supported front ends on the axis satellites.

A device for the pedal drive [patent Canada no SA 2389076 (A1), MPK-7: PM 1/02; publication date: 03.05.2001]containing chain transfer, in which the driven gear is made circular and mounted for rotation around the axis of the carriage, the axis of rotation of the driven gear and the axis of the carriage are the same, and the sixth leading Erna made non-circular with the axis of rotation, passing beyond its geometrical center.

A device for the pedal drive [German patent No. DE 29918657 (U1), MPK-7: VM 3/06; WM 1/02; WM 9/06; publication date: 06.07.2000], comprising a first lever connected to the first end of the rotating shaft, a second lever, the first end pivotally connected to a second end of the first lever, the second end of which is mounted the pedal.

Also known bike drive [French patent No. FR 2782546(A1); IPC-7: F16H 35/00; WM 3/06; publication date: 25.02.2000]that contains the primary lever connected with the shaft, which gives the possibility of rotation, the satellite comprising a gear and a secondary lever on the shaft. The satellite is given the possibility of free rotation on the end of the primary lever. Concentric with the shaft still installed gear with a transmission ratio of 2:1 relative to the satellite gear. Gear connected to the fixed gear through the chain, providing the satellite rotational movement. The drive rods are made in the form of a chain or toothed planetary mechanisms. The disadvantage of this drive is the simultaneous achievement of both pedals symmetrical dead point in which the axis of the pedal arm and carriage are aligned.

The disadvantage of all known pedal drives is the need of much effort required is x for cadence.

The aim of the invention is to reduce the effort required to rotate the pedals, due to the mismatch of moments passing pedals drive the upper and lower dead points where the direction of the vector muscular effort crosses the axis of the cradle and the torque is equal to zero.

This goal is achieved by multiple-choice run the pedal drive.

In the first embodiment, the pedal actuator, made in the form of a planetary mechanism and containing carrier, the first end connected to the shaft of the carriage, a lever with a pedal fixedly connected with the wheel-satellite, fixed wheel with a transmission ratio of 2:1 relative to the wheel-satellite fixedly mounted relative to the vehicle and connected with the wheel-satellite through a chain or belt transmission, the second end of the carrier hinged to the wheel-a satellite at a point offset from the center of the latter, and a fixed gear attached to the form other than circular.

Length W and drove the length R of the lever selected from the ratio of W≥R depending on the constructively predetermined path of movement of the pedals for a specific user.

Link fixed wheels with wheel satellite can also be carried out using different variants of the gear transmission.

In the second variant pedal Pref is on, made in the form of a planetary mechanism and containing drove, United first end of the shaft of the carriage, a lever with a pedal fixedly connected with the wheel-a satellite, which is pivotally connected to the second end of the carrier, a stationary wheel fixedly mounted relative to the vehicle and connected with the wheel-satellite through a gear transmission with an odd number of intermediate leading gears, introduced an intermediate drive sprocket and an additional slave gear wheel rigidly interconnected, and the second end of the carrier hinged to the wheel-satellite, wheel-pinion and the intermediate drive sprocket made with the possibility of rotation concentric axes perpendicular to the longitudinal axis of the carrier, the intermediate driven gear mounted eccentrically relative to the axis of rotation of the leading idler with the possibility of interaction with the stationary wheel mounted eccentric to the shaft of the carriage, while the gear wheels of the satellite and the intermediate drive wheel, and a stationary wheel and the intermediate driven gear selected at the rate of 1:2 and 1:1 respectively.

The axis of the arm 3 attached to the wheel-5 satellite, or crosses the center of the last or not.

Length drove W and arm selected from the ratio of W≥R.

1 schematically shows a pedal drive chain.

Figure 2 schematically shows the gear pedal drive.

Figure 3 schematically shows the trajectory of the axis of rotation of the pedals in the chain drive to the shaft of the carriage.

Figure 4 schematically shows the trajectory of the axis of rotation of the pedals in the gear drive to the shaft of the carriage.

In the first embodiment, the pedal actuator includes a carrier 1, the first end of which is connected to the shaft of the carriage 2, the lever 3 with the pedal 4 is fixedly connected with the wheel-5 satellite, fixed wheel 6 with a transmission ratio of 2:1 relative to the wheel-5 satellite. Stationary wheel 6 fixed relative to the vehicle and is connected with the wheel-satellite 5 by a chain or belt transmission. The second end of the carrier 2, hinged to the wheel-satellite 5, at a point offset from its center, and a stationary gear 6 attached form other than circular. Figure 1-A, 1-B and 1-C show the position of the pedal chain drive with maximum, intermediate and minimum distances between the axes of the pedals respectively. Figure 3-a and 3-B shows the trajectory of the axis pedals for different ratios of lengths W led (1) and R lever (3): W>R and W=R.

In the second case, when using a gear transmission, pedal drive contains water is lo 1, United first end of the shaft of the carriage 2, the lever 3 with the pedal 4 is fixedly connected with the wheel-5 satellite, which is pivotally connected to the second end of the carrier 2, and a stationary wheel 6 fixedly mounted relative to the vehicle and connected with the wheel-satellite 5 through a gear transmission with an odd number of intermediate leading gears. In addition, the actuator is introduced intermediate the drive sprocket 7 and additional slave gear wheel 8, rigidly interconnected, while the wheel-pinion 5 and the intermediate drive sprocket 7 is made to rotate concentric with the axis perpendicular to the longitudinal axis of the carrier, and the intermediate driven gear 8 mounted eccentrically relative to the axis of rotation of the leading intermediate gear 7 with the possibility of interaction with the stationary wheel 6 mounted eccentric to the shaft of the carriage 2. The eccentricities gear 6 and 8 are equal. Gear wheels-satellite 5 and the intermediate drive wheel 7 and the stationary wheel 6 and the intermediate driven gear 8 is selected at the rate of 1:2 and 1:1 respectively.

The axis of the arm 3 attached to the wheel-5 satellite, or crosses the center of the last or not.

Figure 2-a and 2-B shows the gear pedal drive Polo is aniah with the maximum and minimum distances between the axes of the pedals respectively. Figure 4-a and 4-B shows the trajectory of the axis pedals for different ratios of lengths W led (1) and R lever (3): W>R and W=R. the Trajectory shown in figure 3-a and 3-B

Pedal drive works as follows.

In an embodiment of the mechanism with a chain or belt transmission of the force applied to the pedal 4 mounted at one end of the lever 3, the other end still connected with the wheel-satellite (5)is transmitted to the wheel-satellite 5, the hinge and an eccentric fixed on the second protruding end of the carrier 1 with the possibility of free rotation, the first end of the led 1 is connected to the shaft of the carriage 2.

As the wheel-pinion 5 is connected by means of chain or belt transmission with a stationary wheel 6, resulting from the attached to the pedal 4 efforts torque shall turn drove 1 together with the shaft of the carriage 2.

When you press the pedal down 4 the axis of rotation of the wheel-satellite 5 is moved on a circular path of radius carrier 1, at the same time due to the transmission number (the ratio of teeth) fixed wheels 6 and wheels-satellite 5, is equal to 2:1, wheel-5 satellite makes two turns around its axis of rotation for one rotation of the carrier 1.

Due to the eccentric position of the axis of rotation of the wheel-satellite 5, to save the permissible limits of the tension of the chain or belt, a hundred is jnarno wheel 6 is made in the form of an ellipse, its axis does not coincide with the vertical or horizontal. Due to some reversal of elliptical stationary wheel 6 at the time of passage of the wheel centre-satellite 5 in the lower part of the trajectory of the point of its maximum distance from the axis of the carriage, when the axis of the carriage 2, the axis of rotation of the wheel-satellite 5 and the geometric center of the satellite to be on the same line, the lever 3 pedal 4 is at an angle to the axis of the carrier 1, the lower 180 degrees, which provides free passage opposite the pedal 4 to its upper dead point, and due to the eccentricity of the installation of the axis of rotation of the wheel-satellite 5 there is an additional positive torque. As a result, due to the elliptical shape of the stationary wheel 6 and the periodic change of the distance between the axes of the carriage 2 pedal 4, the latest moves by an asymmetric elliptical path.

Pedal actuator made using gear transmission, the muscular force applied to the pedal 4 is transmitted to the lever to the gear-satellite 5, thus rotating the satellite 5 causes the rotation of which is in engagement with it the intermediate gear wheel 7, is rigidly United with the established eccentric relative to the axis of the gear 7 gear 8.

In the cover of the gear 8 around the stationary gear 6 origin of the result of the rotation of the carrier 1 and connected to a shaft of the carriage 2.

Since the gear ratio of the wheel-satellite (5) and the intermediate pinion (7), as well as stationary wheel (6) and the intermediate driven gear (8) is selected at the rate of 1:2 and 1:1, respectively, for two revolutions of the satellite 5 is one revolution of the carrier 1.

Due to the fact that the eccentricities gear 6 and 8 are equal and directed forward in the direction of rotation of the pedals, the time alignment of the points of minimum radius of the wheel 8 and the maximum radius of the wheel 6 coincides with the middle phase of the pedal 4. Consequently, the arc cover solar mechanism fixed wheel 6 in the phase clicking considerably longer than in the recovery phase. As a result, during movement of the pedal 4 down from the upper dead point to the lower carrier 1 rotates substantially greater than 180 degrees, when the first pedal 4 passes top dead center, bottom opposite the lever 3 with the second pedal 4 is at an angle to the cage 1, further clicking on the second pedal to full straightening of the lower arm 3 at the bottom dead point, the first pedal 4 to pass the top dead point and to put the upper arm 3 at an angle to the cage 1 for easy clicking and moving the first pedal 4 down. In the limiting case of equal length W led (1) and the length R of the lever (3), the trajectory of the pedals, preframe is camping in the segment of the arc, intersect the axis of the shaft of the carriage (2).

The use of the proposed pedal actuator reduces the effort required to move the pedals, by choosing the optimal trajectories of their movement and exceptions match the moments of passing the pedals drive the upper and lower dead points, which is especially important for people with disabilities.

1. Pedal drive, made in the form of a planetary mechanism and containing carrier, the first end connected to the shaft of the carriage, a lever with a pedal fixedly connected with the wheel-satellite, fixed wheel with a transmission ratio of 2:1 relative to the wheel-satellite fixedly mounted relative to the vehicle and connected with the wheel-satellite through a chain or belt transmission, while the second end of the carrier hinged to the wheel-satellite, characterized in that the swivel carrier with wheel-made satellite at a point offset from the center of the latter, and a fixed gear attached to the form, other than circular.

2. The pedal actuator according to claim 1, characterized in that the length drove W and lever R is selected from the relation W≥R.

3. Pedal drive, made in the form of a planetary mechanism and containing drove, United first end of the shaft of the carriage, a lever with a pedal, still linked to the first wheel-satellite which is pivotally connected to the second end of the carrier, and a stationary wheel fixedly mounted relative to the vehicle and connected with the wheel-satellite through a gear transmission with an odd number of intermediate leading gear wheels, for example one, characterized in that it introduced an intermediate drive sprocket and an additional slave gear wheel rigidly interconnected, wheel-pinion and the intermediate drive sprocket made with the possibility of rotation concentric with the axis perpendicular to the longitudinal axis of the carrier, the intermediate driven gear mounted eccentrically relative to the axis of rotation of the leading idler with the possibility of interaction with the stationary wheel mounted eccentrically relative to the shaft of the carriage, while the gear wheels of the satellite and the intermediate drive wheel, and a stationary wheel and the intermediate driven gear selected at the rate of 1:2 and 1:1, respectively, and the eccentricities of the intermediate driven gear and the stationary wheels are made equal.

4. The pedal actuator according to claim 3, characterized in that the length drove W and lever R is selected from the relation W≥R.



 

Same patents:

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4 dwg

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