SU984916A1 - Bicycle drive - Google Patents

Description

(54) BIKE DRIVE

one

The invention relates to mechanical engineering, in particular to bicycle building, and can be used in bicycle drives.

A bicycle drive is known, comprising a housing, a synchronization mechanism, and a drive shaft with overtaking mechanisms kinematically associated with the hubs of levers mounted with reciprocating motion 1.

The disadvantages of this drive are the large size and weight, as a result of which the maneuverability deteriorates and the carrying capacity of the bike decreases.

A bicycle drive is also known, which comprises a housing, a timing mechanism and a drive shaft with overrunning mechanisms kinematically associated with the hubs of levers mounted with reciprocating motion 2.

A disadvantage of the known drive is that the total torque transmitted to the drive gear is relatively small, since it depends on the lever length and the gear ratio of bevel gears, the magnitudes of which are limited under conditions of operation of the bike, for a given pressing force on the corresponding lever. .

The purpose of the invention is to reduce the force applied to the levers.

This goal is achieved by the fact that the bicycle's drive is equipped with multipliers, bushings with inner and outer cuts, the casing is made with inner cherries, the drive shaft is made up of worm half-shafts, and each of the multi, Q plators is made as a worm nuts with an external thread for interacting with the specified internal shearing of the housing and internal thread for interacting with the external screw thread of the corresponding sleeve, internal cutting with which is engaged with the external thread worm shaft half.

The drawing shows the drive of the bike, a longitudinal section.

Claims (2)

The bicycle drive includes a housing 1, levers 2 and 3, a synchronization mechanism for the levers 2 and 3, a drive shaft with overrunning mechanisms and multipliers. Case 1 with levers 2 and 3 is made in the form of a hollow cylinder with through slots 4 and 5 for the thickness of the wall of the cylinder and with an internal worm screw cutting along the ends, respectively, right and left. The synchronization mechanism of the levers 2 n 3. is made in the form of a pivotally mounted frame 6 of the bike of the cable-block system, including blocks 7 and 8 and cable 9, rounding blocks 7 and 8. The ends of the cable 9 are attached to the levers 2 and 3. The drive shaft includes semi-shafts 10 and 11 and a driving sleeve 12 in which they are mounted axially rotatably. The other ends of the half-shafts 10 and 11 are made with a left-hand and right-hand worm thread. On the semi-shafts 10 and 11, overrunning mechanisms are installed, containing swiveling 13 and pushing 14 washers with dogs 15 and 16 and brake fingers 17 and 18, as well as ratchet wheels 19 and 20 with brake discs 21 rigidly mounted on the ends of the sleeve 12. Washers 13 and 14 are rotated on the respective half-shafts 10 and 11 by means of clips 22 and 23, which are included in the slots 4. The clips 22 and 23 are connected by means of the cables 24 and 25 to the control drive. The drive shaft is equipped with multipliers, which are made in the form of worm nuts 26 and 27 with external cutting for interaction with the internal cutting of the housing 1 and internal cutting for interaction with the external cutting of the corresponding sleeves 28 and 29. In turn, the internal cutting of the sleeves 28 and 29 is interconnected with external threading of the corresponding worm-shaped half-shafts 10 and 11. In addition, the sleeves 28 and 29 are kinematically connected to the body I with the possibility of reciprocating movement by means of the fingers 30 entering the grooves 5. Before starting work You drive the tension of the cables 24 and 25 loosened, as a result of which the shields 13 and 14 are installed with the help of clamps 22 and 23 in such a way that the dogs 15 and 16 are engaged with the respective ratchet wheels 19 and 20, and each finger 17 and 18 It does not come into contact with the disk 21. At the same time, the levers 2 and 3 are turned relative to one another by an angle of no more than 30 °. The drawing shows a longitudinal section of the bicycle drive when the lever 3 is in the upper position, as a result of this, the nut 27 is unscrewed from the housing 1 and takes (like the sleeve 29) the extreme right position relative to the housing 1. The bicycle drive works as follows. When turning the lever 3 downward, the force is transferred to the nut 27 and through the TSO of the block system 7-9 to the lever 2, causing it to move in the direction of the anti-slip lever 3. The nut 27, turning and moving along the axis of the drive, pushes the sleeve 29, which due to sliding the finger 30 through the groove 5 moves progressively in the housing 1. At the same time, the nut 26 under the action of the lever 2, rotates, moves and, screwed into the housing 1, retracts the sleeve 28, which also moves progressively in the housing 1. At the same time, it fell 1 1, rotating with the Aiba 13 and 14 rotates the pawls 16, which cause the wheel 20 and the hub 12 to rotate. The wheel 19 idle at the same time. Due to the presence of opposite cuts in pairs, the nut body and nut bush 19 and 20 and bush 12 rotate in the same direction, regardless of the direction of movement of the levers 2 and 3. The operation of the bicycle drive is similar to that shown in the case when the force is transmitted to the lever 2. In the case of braking, the sleeves 12 of the clamp 13 and 14 through the clamps 22 and 23, when the cables 24 and 25 are tensioned, rotate so that the fingers 17 and 18 come into contact with the pads 21 and prevent the rotation of the sleeve 12. When the sleeve 12 is in rotation , washers 13 and 1 4 is set in a neutral position, in which the paws 15 and 16, the fingers 17 and 18 do not touch the wheels 19, 20 and the discs 21. The proposed implementation of the bicycle drive makes it possible to increase the torque more than 10 times as compared with the prototype the count of worm-hole pairs of the shaft sleeve (while ensuring the reciprocating motion of the sleeve), the nut sleeve and the nut-housing screw pair. At the same time, the worm and screw pairs increase the angle of rotation of the shaft and, therefore, the drive bush with a relatively small angle of rotation of the levers. Claims of the invention A bicycle drive comprising a casing in which a synchronization mechanism and a drive shaft with overrunning mechanisms housed kinematically connected to the hubs of levers mounted with the possibility of reciprocating movement are used, characterized in that, in order to reduce the force applied to the levers , it is equipped with multipliers, bushings with inner and outer worm thread, the body is made with inner worm thread, the drive shaft is composed of worm half pits, and each of the multipliers made in the form of a worm nut with an external thread for interacting with said internal thread of the housing and an internal thread for interacting with the external screw thread for a corresponding sleeve, the internal thread of which engages with the external thread of the corresponding worm half of a half shaft. Sources of information taken into account during the examination 1. Austrian patent number 153845, cl. 63 B, 1946. 2. USSR author's certificate No. 592661, cl. In 62 M 11/04, 1975. (prototype).