Pedal drive industries

 

(57) Abstract:

Usage: the invention relates to velotechnik and can be used on bicycles, velomobiles, exercise bikes. The essence of the invention: drive contains the pedal 2, the two levers of equal length connected by one end with a cylindrical hinge, and the elastic element 5 due levers and stops 11 and 12, the relative position of the lever. In the initial position the levers are perpendicular to each other in the plane of their rotation. The second end of the master arm 1 is connected with the pedal, and the second end of the driven lever 3 with the shaft 4 of the carriage. When the pedal is leading the lever is rotated relative to the slave at an angle in the range from 0 to 90. The amount of the leverage action of the drive force is proportional to this force, therefore the torque on the shaft is proportional to the square of the strength that improves flexibility and traction properties of industries to the road conditions. The elastic element can be applied to the following types: cylindrical spring, spiral spring, a pair of elastic console - Cam, torsion bar, leaf spring. 5 C. p. F.-ly, 5 Il.

The invention relates to velotechnik and can be used on bicycles, velomobiles, veltre who once which is connected to the shaft sprocket, and the other pedal. In some known constructions pedal drive provides higher torque on the driving wheel by changing the length of the arm. For example, in the construction of [1] , which before the beginning of the movement to regulate the length of the lever, the lever is made of a composite, where one part is connected with the shaft of the carriage, the other pedal. The lever extension made a few holes that allows you to set several fixed positions of the links and therefore the lengths of the lever.

The closest to the invention is a construction in which the length of the lever is changed automatically depending on the pedal position and direction of the force on the pedal [2] . This drive has a primary long lever that transmits torque to the shaft of the carriage, and additional short torque carrying the pedal. At the end of the main lever is made a recess into which is inserted a bearing for connection with a short lever.

Under the force of feet short lever is installed in the outer side from the axis of the pedal mechanism, thereby increasing the leverage of the application of forces thereto. In idle mode the lever occupies the position in the direction of the axis of the I torque. In addition, in this construction, the increase of the leverage action of the drive force is not proportional to the magnitude of this force, which limits the flexibility of the traction properties of industries to the road conditions.

In the known pedal actuator in the form of articulated two levers with pedals at the end of the one (master) applied elastic element connection of the levers, the levers of equal length and in the original position are located in the plane of rotation perpendicular to each other, and when forces on the pedal angle between them can increase and reach 180about. The initial and final relative positions of the levers is determined by the special limits of the position of the lever. The elastic element provides the change of the distance between the axis of the shaft sprocket (shaft carriage) proportional to the applied pedal force, and this leads to a proportional increase of the leverage action of this force.

Since the torque on the shaft of the carriage is equal to the product of the drive force on the shoulder of this force, this design with the change (e.g. increase) the driving force provides change (e.g. increase) the torque is not on lne movement industries. The use of levers of equal length, located in the initial position in the plane of rotation perpendicular to each other, provides the maximum change of the leverage action of the drive force, which may increase 20.5 times.

In Fig. 1 shows the design of this pedal actuator with cylindrical spring; Fig. 2 - wheel drive with a spiral spring; Fig. 3 - drive with a pair of Cam-elastic console of Fig. 4 - graphs of workflow parameters of the actuator depending on the angle of rotation of the shaft of the carriage; Fig. 5 - graphs of parameter changes in a function of the magnitude of the driving force.

The proposed drive system is composed (Fig. 1) from the top of the lever 1, which is fixed to the pedal 2, the driven lever 3 connected with the shaft 4 of the carriage, a cylindrical spring 5, placed in the annular groove swivel levers 1 and 3, the cover 6, sleeve 7 and washers 8 slides and screws 9.

Annular groove formed by surfaces with special recesses in the enlarged leading end of the lever, the head of the slave arm and the cover. Spring 5 rests one end to the lug 10 of the head arm 3 and the other on the ledge 11 in the recess of the lever, which simultaneously limit "folding" of the levers 1 th spring in the device can be applied to other elastic element: coiled spring, torsion bar, a pair of Cam-elastic console flexible arm, etc.

For example, the actuator spiral spring has a helical spring 13, secured in the outer end in the groove of the connecting head 14 of a driving lever, and internal - in groove of the Central protrusion 15 of the housing 16 of the hinge connected to the slave arm 3. In the housing 16 slot 17 to provide rotation of the lever relative to the lever 3. The slot 17 is made between the stopper 18 of the original position of the lever 1 and the stopper 19 and maximum stroke.

Drive with a pair of Cam-elastic console (Fig. 3) contains the axis 20 of the connecting hinge, Cam 21 with a roller 22 mounted on the lever 1, and the elastic console 23, right (in the drawing), the end of which is rigidly connected with the lever 3, and the left free in the initial position (Fig. 3A).

The proposed device operates as follows. Force applied to the pedal 2 in traction mode, creates a torque on the shaft 4 of the carriage (counterclockwise rotation). Component of the effort that is parallel to the longitudinal axis of the lever 3 causes the emergence of torque, which is part of the total torque on the shaft 4, the lever 1 about the axis of the swivel levers 1 and 3. This frequently is:, and the protrusion 10 on the head of the lever 3. The compression spring causes rotation (Fig. 1 counterclockwise) arm 1 relative to the lever 3. The distance between the axis of the pedal 2 and the axis of the shaft 4 of the carriage is increased, providing increased leverage action of the drive force, and an additional increment of torque on the shaft 4. The higher the driving force, the greater the leverage. The maximum deformation of the spring 5 is limited by the movement of the protrusion 12 to contact with the lever 13. The nut 7 and washer 8 perform the role of bearings, reducing friction and wear of the mating surfaces of the heads of the levers of the hinge.

While reducing stress acting on the spring 5, it restores the original relative position of the levers, while passing the pedal bottom dead point of the smallest distance from the axis of the pedal to the shaft axis carriage. When carrying out reverse (brake mode) tab 11 prevents the folding levers, ensuring that the shaft 4 of the braking torque, the spring 5 is not involved in the transmission of drive forces.

In the drive with a spiral spring (Fig. 2) when exposed to the efforts of the foot on the pedal 2 is the rotation of the handle 1 relative to the lever 3 is defined by the distance from the axis of the pedal 2 to the axis of the shaft 4 of the carriage, increases. The spring 13 is twisted and creates a reaction torque, ensuring the return of lever 1 to its original position upon reduction efforts.

In the drive with a pair of Cam-elastic console (Fig. 3) the impact of the efforts of the Fnthe pedal causes the lever 1 with the Cam 21 relative to the lever 3. The roller 22 of the Cam acts on the free end of the elastic console 23, which is curved, creating a reactive torque on the lever 1. Folding levers 1 and 3 increases the leverage action of drive force to the shaft axis 4.

Calculations show that if we assume the change of the drive force Fnthe pedals on the angle of rotation of the shaft of the carriage (lever 3) piecewise linear (Fig. 2, curve 24, where the angle is measured from the position of the lever 3, corresponding to the pedal position at the top dead point), the change of the distance R from the axis of the pedal to the shaft axis carriage will be characterized by dependence on the angle represented by schedule 25, where x= R/Rabout; Raboutthe distance R in the absence of forces acting on the actuator. The value of x increases from 1 to 1.4. Increases torque on the shaft (figure 26).

Curve 27 shows change of torque military estimates obtained with the following values: spring stiffness 3750 N/m; the distance from the spring axis to the axis of the hinge of 0.066 m; the initial distance from the axis of the pedal from the axis of the shaft 0.18 m; the length of the levers 0,128 m

In Fig. 5 presents a comparison of the maximum torque generated by the proposed actuator (figure 28) and strictly single lever (figure 29) depending on the maximum force on the pedals. This suggests that the proposed transmission delivers more torque, which gradually increases in a quadratic dependence on the driving force. If you think of the proposed pedal drive as a mechanism for continuously changing the gear ratio, the range of change of the gear ratio varies depending on the effort shown in the graph 30. Its maximum value is equal to 1.4.

(56) U.S. Patent N 14850245, CL G 05 G 1/14, 1989.

Application France N 2623769, CL 62 M 3/04, 1989.

1. PEDAL DRIVE of INDUSTRIES, consisting of pedals and two levers connected one ends by means of a cylindrical hinge, one of the levers free end is connected with the shaft of the carriage and a leading asterisk, and the free end of the other lever with the axis of the pedal, characterized in that it is provided with an elastic element connection arm and ogran sporogony perpendicular to each other in the plane of their rotation.

2. Drive under item 1, characterized in that the elastic element is designed as elastic console.

3. Drive under item 1, characterized in that the elastic element is designed as a spiral spring.

4. Drive under item 1, characterized in that the elastic element is designed as elastic console placed on the slave arm, the free end of which is mounted for cooperation with the Cam mounted on the connecting head of the leading arm.

5. Drive under item 1, characterized in that the elastic element is designed as torsion.

6. Drive under item 1, characterized in that the elastic element is designed as leaf springs.

 

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