Vehicle muscular drive

FIELD: transport engineering.

SUBSTANCE: invention relates to drives with reciprocating levers. Driving rocker 2 and driven rocker 4 are connected by connecting rod 3. Pedals are secured on driving rockers 2, and tie-rods are connected to driven rockers 4 for coupling them with freewheeling mechanisms 6. Driven rockers 4 can be suspended from slider 10, rocker or eccentric to change ratio of drive in motion.

EFFECT: enlarged ratio change range in drives with reciprocating levers.

6 cl, 13 dwg

 

The invention relates to a device for the actuation of wheeled vehicles, in particular bicycles, by human muscle force acting on the pedal, making the vibrational motion.

Drives bicycles and velomobiles, leading the links which move the reciprocating or back - and-rotationally, known widely enough. One of their advantages is the ability to control gear ratio by changing the lengths of the links of the mechanism.

Known, for example, muscular wheel drive vehicles [A.S. USSR 1507639]containing levers with pedals mounted on the carriage axle. Each of the levers with pedals equipped with an additional lever rigidly connected with him. In directing additional lever placed the toothed rack having an ear for thrust transmitting movement through the freewheel on the driven shaft of the drive wheel of the vehicle. Each rail is engaged with the gear, the axis of which is fixed to the secondary lever. Gear connected with rotary handle mounted on the steering wheel. To change the gear ratio of the drive cyclist through a flexible shaft rotates gear and shifts the slats fixed on them rods relative to the center of the carriage, changing thereby the transfer referred the e drive.

A disadvantage of this device is the low reliability associated with the presence of the flexible shaft. Not having sufficient torsional rigidity, it is delayed with the transfer of control does not provide the same ratio in both the pedals and wears out quickly. In addition, the gear rack no effect and requires an additional device for fixing the position of the rail, which is in the description not mentioned.

The above-described principle of the change gear ratio of the actuator by varying the lengths of the leading levers, connected with pedals, and used in other devices. Their common disadvantage is the complexity of the mechanism that transmits the control action on the two levers simultaneously, and low reliability.

There is another principle of varying the gear ratio of the drive from two swinging pedals. It consists of introducing between the pedal levers and the thrust of intermediate links, interacting with the stand. When this Manager is the argument stands, one for two pedals. In the drive, known as No. 1326494 applied rocker mechanism for changing gear ratios. In it the pedal levers are the scenes. Each of them is connected to the progressive pair with a rocker-stone (in A.S. No. 1326494 last structurally designed as a system role is s) which is pivotally connected with an additional lever (in A.S. No. 1326494 this link is called the rod). Suspension axis of the two pedal levers at the front, as well as the axis of suspension of two additional levers, General. In the optical disc device, which allows you to change the position on the rack common axis of the levers, thereby to vary the gear ratio of the actuator during movement of the vehicle.

The disadvantage of these and similar devices is the presence of progressive pairs, which in its classic performance causes great friction losses, and being replaced by some system of rolling bodies (as in A.S. No. 1326494) leads to unnecessary complexity of the design of the mechanism.

The closest proposed design is muscular wheel drive vehicle (A.S. No. 785104), based on the use of articulated chetyrehzvennoj, namely dvuhsotmetrovyh mechanisms. This drive contains the pedal levers (leading arm), each of which is pivotally connected with rods (rods)connected to the swinging links (slave arm), the hinges are fixed on the frame of the vehicle, a mechanism for converting oscillatory motion into rotational made in the form of two sprocket with freewheel clutches placed on the shaft, and supports the processes of stars, fastened to the frame and chain, fixed by their ends on the driven rocker arm and covering the stars.

The design of the drive allows adjustments to the suspension axis of the driven rocker on the racks, but not during movement of the vehicle. Dignity dvuhkonusnogo mechanism compared with the rocker is the lack of translational pairs.

The disadvantages of this construction:

the inability to produce the variation of gear ratio actuator during movement;

the ratio of the lengths of the links of the mechanism and location of the guide rack on which it is possible to make the installation movement of the axis of the suspension arm, such that when performing this move, not so much changing the gear ratio as the distance of the pedals to the ground, i.e. the variation of gear ratio in a wide range impossible.

To address these shortcomings in the muscular drive a vehicle containing two dvuhsotmetrovyh mechanism, including overall rack (frame), master and slave arm and the rod, leading the rocker arm which is fixed to the pedal and to the slave rocker arm included in traction, connecting them with mehanizmi freewheel mounted on the driven shaft, and the axis of suspension of both the driven rocker is shared by the second and fixed on the frame with the possibility of installation of the move (i.e. regulation of the length of the rack), you are prompted for the following special property: control gear drive is provided through the device changes the length of the rack, with the possibility of regulation in the process of movement of the vehicle.

The proposed kinematic scheme works effectively in two areas parameters:

1) when the length of the rack in the whole range of regulation is greater than the length of the slave arm,

2) when the length of the rack in the whole range of its regulation remains less than the length of the slave arm. The slave arm is structurally designed S-shaped and cover the axis of suspension of the leading rocker.

In layouts with horizontal arrangement of the leading rocker pedal characteristic of the rental, the first case is combined with the location of the slave arm above the axis of suspension of the leading beam and the second from the bottom location of the suspension axis of the slave arm.

The device changes the length of the rack includes an adjusting element (slider or rocker), which is fixed to the axis of the hinge suspension trailing arm, and the position lock of this link.

To improve ease of operation gear ratio of the drive device to change the length of the rack contains the spring, clamped the adjusting element in a direction suitable for the m to increase the amplitude of oscillations of the slave arm, and the lock position of the adjusting link is connected (for example, flexible cable) with a control element (lever, button), mounted in a convenient location (for example, on the handlebars of the bike).

To provide a stepless variation of the gear ratio of the drive device to change the length of the rack adjusting element is a Cam, the outer circumference of which interacts with the rack stops spaced around the circumference relative to each other at an angle of 180°-(15°...35°), and the axis of the suspension arm is offset relative to the center of the specified circumference by the value of 0,3 to 0,7 its radius.

Figure 1 shows the kinematic diagram dvuhkonusnogo mechanism to the upper position of the slave arm. Figure 2 - diagram of the bottom position of the axis of suspension of the slave arm. Figure 3 - the family of curves, the transfer function of the drive mechanism with the upper position of the slave arm. 4 is a family of curves, the transfer function for the case of the lower location of the point of suspension of the slave arm. Figure 5 - example of a structural implementation of the scheme with the upper position of the slave arm in the drive bike. 6 is the section along a-A. Fig.7 - device to change the length of the rack with the gear retainer. Fig his section a-A. Figure 9 - device to change the length of the rack effect type. Figure 10 - it is azres along a-A. 11 - drive design with bottom location of the suspension axis of the slave arm. Fig his section along B-B. Fig - the section on In-C.

Dvuhsotmetrovy mechanism to the upper position of the slave arm, the scheme of which is shown in figure 1, contains the rack 1, leading to the yoke 2, the rod 3, the slave arm 4, rod 5, the free-wheeling mechanism (USDA) 6.

The work of this mechanism is as follows. Arm 2 makes swinging movement of constant amplitude, and his point And moves from position A1in position a2. This belongs to the slave arm 4 point moves from position B1in the position In2the distance between which corresponds to a given position on the rack. Displacement of a point With position With’ conducts to change of chord length B1B2-B1’B2’. Accordingly, the movement 5 driving USDA 6, and hence the angle of rotation of the driven shaft.

The ratio of angular velocities of the master and slave units i2626depending on the angle ϕ rotation of link 2 at different positions of the points shown in figure 3. Than lower point C, the less i26. Factor Kivariation of average for a series of values of i26even greater than required for a Bicycle in which a mask To i=3. The deviation of the instantaneous values of i26(ϕ) from the average in the working range of angle ϕ 60° not to exceed ±10°.

Mechanism, the scheme of which is shown in figure 2, has the same links. The difference is that the point of suspension of the slave arm 4 lies below the axis Of suspension of the leading beam 2, and the length of the rack OS is always less than the length of the rocker ST.

In addition, rod 5 fixed to the arm 4 at point b, and another arbitrary point f To all elements could be located and move in the same plane, the link 4 is made of C - shaped. The mechanism is similar to the previous one. However, you can see that the curves i26(ϕ), shown in figure 4, more gentle. All other things being equal, this scheme gives a lower variance instant i26from the average than the previous one (not exceeding ±3%).

The example design schemes with top location of the slave arm in the drive of a Bicycle is shown in figure 3 and 6. In addition to parts 1-6 mentioned above, the device contains a spring 7, which together with (MA) 6 and thrust 5, which in this case is a chain, known system of “chain Ghali, providing a constant chain tension. To synchronize the movement and return the pedal to its original position serves as the cable 8, thrown through the block 9.

The device changes the length of the rack during the movement keep the adjusting link the slider 10, spring 11, a latch 12, a flexible cable 13 connecting the latch with lever on the handlebars (figure not shown), and spring retainer 14. The slider 10 is slave axis of the rocker arm 4 and comprises a frame 1 to prevent twisting.

The device changes the length of the rack works as follows. To reduce the gear ratio in the active phase of the work of the Ministry of agriculture cyclist firmly presses on the pedal, which is currently below and frees the latch 12 (by means of the cable 13). Overcoming the force of spring 11, the slider 10 is lowered down, reducing, thereby, the length of the column. Cyclist weakens the cable 13, under the action of the spring 14 and the retainer 12 is returned into place and locks the slider 10 in the new position.

To increase the reduction ratio of the cyclist releases the latch 12, not pressing on the pedal. Under the action of the spring 11 of the slider 10 rises, increasing the length of the column.

7, 8 shows a simpler device to change the length of the rack. In it the adjusting element is in the form of a rocker arm 15. Cyclist hand presses on the latch 12 and moves the arm 15 in the desired position without pressing on the pedal.

In the device shown in figures 9, 10, adjusting the rocker 15 is made in the form of an eccentric Cam and installed between the lugs 16 of the rack 1, posted between an external ukrainedikanka at an angle of 180° -(15°...35°), which provides the braking of this compound under the action of forces applied to the adjusting arm 15 from the side of the driven rocker arm 4. The axis of suspension of the slave arm 4 is displaced relative to the center of the specified circle at a distance less than its radius, which further enhances the effect of automatic braking. This device provides a stepless change of the length of the column.

To change the gear ratio of the transmission is not pressing on the pedal, move the adjustment arm 15 in the desired position.

On 11, 12, 13 shows an example of executing a drive with lower location of the point of suspension of the slave arm 4.

The adjusting link, the slider 10 has a freedom of vertical adjusting movement relative to the frame 1. The operation of the device is similar to the device shown in figure 5.

The proposed muscle actuator allows the change of gear ratio i is not less than three times. Regulation i can be performed during the movement of the bike. The device changes i have high reliability and does not reduce the efficiency of the drive.

1. Muscular wheel drive vehicle containing two dvuhsotmetrovyh mechanism, including overall rack, master and slave arm and the rod, leading the rocker arm which is fixed to the pedal and to vitaminkaanika attached thrust, connecting them with mechanisms freewheel mounted on the driven shaft, and the axis of suspension of both the driven rocker is a common and fixed on the frame with the possibility of changing the length of the rack, characterized in that the control gear ratio drive is provided through the device changes the length of the rack, with the possibility of regulation in the process of movement of the vehicle.

2. Muscular wheel drive vehicle according to claim 1, characterized in that the slave arm is located above the axis of suspension of the leading beam and the length of the rack in the whole range of regulation is greater than the length of the slave arm.

3. Muscular wheel drive vehicle according to claim 1, characterized in that the length of the column in the whole range of its regulation is less than the length of the slave arm, the axis of suspension of the slave arm is located below the axis of suspension of the leading arm, and they led rocker performed-shaped and cover the axis of suspension of the leading rocker.

4. Muscular wheel drive vehicle according to claim 1, characterized in that the device changes the length of the rack includes an adjusting element, which is fixed to the axis of the hinge suspension trailing arm, and the position lock of this link.

5. Muscular wheel drive vehicle according to claim 1 or 4, characterized in that the device changes the length of a hundred the key contains a spring, clamped the adjusting element in the direction corresponding to the increase of the amplitude of oscillations of the slave arm, and the position lock of the adjustment link associated with a control lever mounted on the steering wheel of the vehicle.

6. Muscular wheel drive vehicle according to any one of claims 1, 2, 4, characterized in that the adjusting element is a Cam, the outer circumference of which interacts with the rack stops spaced around the circumference relative to each other at an angle of 180°-(15°C°), and the axis of the suspension arm is offset relative to the center of the specified circumference by the value of 0,3-0,7 its radius.



 

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