CN212155691U

CN212155691U - Stepless speed variator

Info

Publication number: CN212155691U
Application number: CN202020233528.4U
Authority: CN
Inventors: 蔡昊键
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2020-12-15
Anticipated expiration: 2030-02-28

Abstract

The utility model relates to a continuously variable transmission, including variable speed drive unit: the motor and the transmission shaft are connected in a transmission manner, one end of the transmission shaft is connected with the motor in a transmission manner, and a transmission gear ring is sleeved at the other end of the transmission shaft; a first shift adjusting unit: the transmission shaft is coaxial with the driving transmission disc, the first bevel gears are circumferentially arranged in a surrounding manner at equal intervals along the transmission gear ring and are meshed with the transmission gear ring, the first worm is coaxially fixed with the first bevel gears, the first limiting blocks are screwed on the first worm, and the distances between the circle centers of all the first limiting blocks and the driving transmission disc are equal; a second shift adjusting unit: the distance between the circle centers of the second limiting block and the driven transmission disc is equal; driving a belt: the kinetic energy of the driving transmission disc is transmitted to the driven transmission disc. The utility model discloses but the drive ratio between two driving discs of smooth change realizes infinitely variable.

Description

Stepless speed variator

Technical Field

The utility model relates to a speed change gear especially relates to a continuously variable transmission.

Background

The continuously variable transmission is one of automatic transmission type gearboxes, and refers to a transmission system capable of continuously obtaining any transmission ratio in a transmission range. The stepless speed changer is connected with the engine and the wheels, transmits power to the wheels after receiving power from the engine, and realizes stepless speed change of the automobile by stepless adjustment of the transmission ratio of input power and output power.

The Continuously Variable Transmission is classified into a Variable ramp type Continuously Variable Transmission and a CVT (CVT) Continuously Variable Transmission. The stepless speed changer uses two groups of belt wheels for speed change transmission, and changes the speed by changing the contact radius of a driving wheel, a driven wheel and a transmission belt, and most of the existing stepless speed changers are CVT (continuously variable transmission).

Referring to fig. 1, fig. 1 is a schematic diagram of a main structure of a CVT. The CVT mainly comprises basic components such as a driving wheel set, a driven wheel set, a transmission belt and the like. The driving wheel set and the driven wheel set are both composed of a movable disk and a fixed disk, wherein the belt wheel on one side can slide on the shaft and is the movable disk, and the belt wheel on the other side is fixed and is the fixed disk. The movable disc and the fixed disc are both conical surface structures, the conical surfaces of the movable disc and the fixed disc form a V-shaped groove, and the driving belt is sleeved on the V-shaped grooves of the driving wheel set and the driven wheel set and transmits power to the driven wheel set from the driving wheel set. The power output by the output shaft of the engine is firstly transmitted to a driving wheel set of the CVT, then transmitted to a driven wheel set through a transmission belt, and finally transmitted to wheels through a speed reducer and a differential mechanism to drive the automobile. The movable disc of the driving wheel set and the movable disc of the driven wheel set move axially to be close to or far away from the fixed disc during working, so that the working radius of the conical surfaces of the driving wheel set and the driven wheel set matched with a transmission belt is changed, namely, the transmission ratio between the driving wheel set and the driven wheel set is adjusted, and the axial movement amount of the movable disc is realized by a driver adjusting the pressure of the driving wheel set, the driven wheel set and a hydraulic pump oil cylinder through a control system according to the requirement. Because the working radius of the driving wheel and the driven wheel of the CVT can be continuously adjusted, the CVT can realize stepless speed change.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel buncher.

A continuously variable transmission characterized in that: the device comprises a variable-speed driving unit, a driving unit and a control unit, wherein the variable-speed driving unit comprises a motor and a transmission shaft, one end of the transmission shaft is in transmission connection with the motor, and the other end of the transmission shaft is sleeved with a transmission gear ring; the first speed change adjusting unit comprises a driving transmission disc, a plurality of first bevel gears, a plurality of first worms and a plurality of first limiting blocks, wherein the plurality of first bevel gears, the plurality of first worms and the plurality of first limiting blocks are arranged on the driving transmission disc, the transmission shaft is coaxial with the driving transmission disc, the first bevel gears are arranged in a surrounding manner at equal intervals along the circumferential direction of the transmission gear ring and are meshed with the transmission gear ring, each first worm is coaxially fixed with one first bevel gear, each first limiting block is screwed on one first worm, and the distances between the centers of circles of the first limiting blocks and the driving transmission disc are equal; the second variable speed adjusting unit comprises a driven transmission disc and a plurality of second limiting blocks arranged on the driven transmission disc, and the distances between the second limiting blocks and the circle center of the driven transmission disc are equal; and the driving belt surrounds the outer profiles of the first limit blocks and the second limit blocks, and can transmit the kinetic energy of the driving transmission disc to the driven transmission disc.

Buncher come control initiative drive plate and driven drive plate actual diameter's size according to the position of stopper, provide a brand-new structure of adjusting the drive plate diameter variable speed drive unit makes the regulation back, and the position of stopper changes immediately for initiative drive plate and driven drive plate participate in driven actual diameter and take place level and smooth change, thereby level and smooth change the drive ratio of initiative drive plate and driven drive plate, realize infinitely variable speed.

Further, a tensioning unit is arranged on the transmission belt. So that the drive belt is always under tension.

Further, the tensioning unit comprises a tensioner, a spring and a roller; the spring is arranged between the tensioner and the roller, and the roller presses on the transmission belt. The transmission belt can be always kept in a tensioned state, and the transmission efficiency is prevented from being influenced because the transmission belt is not tensioned.

Furthermore, the second variable speed adjusting unit further comprises a plurality of second bevel gears and a plurality of second worms which are arranged on the driven transmission disc, the second worms are uniformly distributed on the driven transmission disc along the radius of the driven transmission disc, one end of each second worm, which is close to the circle center of the driven transmission disc, is coaxially fixed with one second bevel gear, and each second limiting block is screwed on one second worm.

Further, the variable speed drive unit further includes a carrier, a driven gear set, and an inner ring gear; the planetary gear carrier is in transmission connection with the motor, the driven gear set is meshed with the planetary gear carrier and the internal gear ring, and the internal gear ring is connected with the transmission shaft. The power output and the conduction of the power driving unit are more stable.

Furthermore, the driven gear set comprises a plurality of driven gears and a plurality of gear fixing shafts; and two ends of each gear fixing shaft are respectively fixed with one driven gear, the driven gears are meshed with the internal gear ring, and the gear fixing shafts are connected with the image gear rack.

For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic diagram of the main structure of a CVT

FIG. 2 is a schematic transmission between the first shift adjusting unit and the second shift adjusting unit;

FIG. 3 is a schematic transmission between the variable speed drive unit and the first variable speed adjustment unit.

In the figure:

a variable speed drive unit 10; a variable speed motor 11; a planet carrier 12; a driven gear set 13; a driven gear 131; a gear fixing shaft 132; an inner meshing ring gear 14; a transmission shaft 15; a transmission gear ring 151; a first shift adjusting unit 20; a driving transmission disc 21; a first bevel gear 22; a first worm 23; a first stopper 24; a second shift adjusting unit 30; a driven transmission disc 31; a second bevel gear 32; a second worm 33; a second stopper 34; a transmission belt 40; a tension unit 50; a tensioner 51; a spring 52; a roller 53.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

Buncher wholly set up between the engine of car and wheel, the power of engine output passes through buncher and conducts to the wheel to realize the drive of car. Referring to fig. 2 and fig. 3, fig. 2 is a schematic transmission diagram between the first shift adjusting unit and the second shift adjusting unit; FIG. 3 is a schematic transmission between the variable speed drive unit and the first variable speed adjustment unit. Continuously variable transmission include variable speed drive unit 10, first variable speed regulating unit 20, second variable speed regulating unit 30, drive belt 40 and tensioning unit 50. The variable speed driving unit 10 outputs power when speed regulation is needed, and transmits the power to the first variable speed adjusting unit 20, the first variable speed adjusting unit 20 is in transmission connection with the second variable speed adjusting unit 30 through the transmission belt 40, and the tensioning unit 50 is arranged on the transmission belt 40, so that the transmission belt is kept in a tensioned state at any time. When the speed change driving unit 10 outputs power for speed adjustment, the output power causes the first speed change adjusting unit 20 to initially adjust, so that the transmission ratio transmitted to the second speed change adjusting unit 30 through the transmission belt 40 changes, thereby realizing stepless speed change.

The speed change drive unit 10 includes a speed change motor 11, a carrier 12, a driven gear set 13, a ring gear 14, and a transmission shaft 15. The speed change motor 11 is in transmission connection with the planet carrier 12; the driven gear set 13 includes a plurality of transmission gears 131 and a plurality of gear fixing shafts 132, one transmission gear 131 is fixed at each end of the gear fixing shaft 132, in this embodiment, there are 4 gear fixing shafts 132 and 8 transmission gears 131, and the middle parts of the gear fixing shafts 132 are connected to the planetary gear carrier 12 through bearings; two inner gear rings 14 are respectively arranged on two sides of the planetary gear carrier 12 and respectively meshed with the transmission gears 131 at two ends of the gear fixing shaft 132; the transmission shaft 15 is fixed at the center of the inner engagement gear ring 14, and a transmission gear ring 151 is fixedly sleeved on the transmission shaft. Specifically, in this embodiment, the transmission shaft 15 has a double-layer structure, the outer layer is a hollow shaft, a fixed shaft is sleeved inside the hollow shaft, and the hollow shaft and the fixed shaft are fixed by a bearing.

The first variable speed adjustment unit 20 includes a driving transmission disc 21, a plurality of first bevel gears 22, a plurality of first worms 23 and a plurality of first stoppers 24. The first worms 23 are uniformly arranged on the radius of the driving disc 21, one end of each first worm 23, which points to the axis of the driving disc 21, is fixed with one first bevel gear 22, each first worm 23 is provided with one first limit block 24, the positions of the first limit blocks 24 on the first worms 23 are the same, and the first limit blocks 24 can rotate upwards or downwards along with the rotation of the first worms 23. The axis of the driving transmission disc 21 is connected with the transmission shaft 15 through a bearing, and the first bevel gears 22 are all meshed with the transmission gear ring 151. In this embodiment, there are 8 first bevel gears 22, 8 first worms 23, and 8 first limiting blocks 24, and the 8 first worms 23 are uniformly arranged on the driving disc 21 in a shape like a Chinese character 'mi'.

The second variable speed adjustment unit 30 includes a driven transmission disc 31, a plurality of second bevel gears 32, a plurality of second worms 33 and a plurality of second stoppers 34. The second worms 33 are uniformly arranged on the radius of the driven transmission disc 31, each second worm 33 points to one second bevel gear 32 fixed at one end of the axis of the driven transmission disc 31, each second worm 33 is provided with one second limit block 34, the position of each second limit block 34 on the second worm 33 is the same, and the second limit blocks 34 can rotate upwards or downwards along with the rotation of the second worm 33. In this embodiment, there are 8 second bevel gears 32, 8 second worms 33 and 8 second limit blocks 34, and the 8 second worms 33 are uniformly arranged on the driven transmission disc 31 in a shape like a Chinese character 'mi'.

The driving belt 40 may be one of a belt, a synchronous belt or a steel chain, and surrounds the first stoppers 24 and the second stoppers 34, so as to transmit power to the driven driving disc 31 when the driving disc 21 axially rotates.

The tension unit 50 includes a tensioner 51, a spring 52 and a roller 53. The spring 52 is disposed between the tensioner 51 and the roller 53, and the spring 52 presses the roller 53 against the belt 40.

In the running process of the automobile, the power of the automobile engine is transmitted to the driving transmission disc 21 to enable the driving transmission disc 21 to rotate, the driving transmission disc 21 transmits the power to the driven transmission disc 31 through the transmission belt 40, the driven transmission disc 31 transmits the power to the automobile wheels, the automobile wheels rotate like the automobile wheels, and the automobile runs normally.

When the continuously variable transmission of the present invention is normally operated, the power transmission direction is as follows: the speed change motor 11 outputs power to rotate the planetary gear carrier 12, the power is driven by the planetary gear carrier 12 via the gear fixing shaft 132 to rotate the driven gears 131 disposed at both ends thereof, the driven gears 131 drive the two internal gear rings 14 to rotate, the internal gear rings 14 are further transmitted to the transmission shaft 15, the transmission shaft 15 is transmitted to the first bevel gear 22 via the transmission gear ring 151 on the transmission shaft, and the first bevel gear 22 drives the first worm 23 to rotate, so that the first stopper 24 can rotate up and down relative to the first worm 23.

When the speed change motor 11 is not in operation, the planet carrier 12 is not disturbed by external force, and the external force is not transmitted to the first bevel gear 22, so that the external force is not transmitted to the first limit block 24 by the first worm 23, and the positions of the plurality of first limit blocks 24 on the first worm 23 arranged on the first limit blocks are kept unchanged, so that the length of the transmission belt 40 around the outer parts of the plurality of first limit blocks 24 is not changed, and the actual radius of the transmission belt 40 around the driving transmission disc 21 and the driven transmission disc 31 is fixed, thereby ensuring that the transmission ratio is constant. When speed change is required, the speed change motor 11 is started to drive the planetary gear carrier 12 to rotate, the planetary gear carrier 12 drives the driven gears 131 fixed at two ends thereof to rotate through the gear fixing shaft 132, the transmission gear 131 drives the internal gear ring 14 to rotate, so that the transmission shaft 15 fixed with the internal gear ring 15 rotates, the transmission gear ring 151 on the transmission shaft 15 rotates along with the transmission gear ring, so that the first bevel gears 22 meshed with the transmission gear ring rotate and rotate simultaneously with the first worm 23 fixed with the transmission gear ring, so that the first limit block 24 rotates up or down relative to the first worm 23, the length of the outer part of the transmission belt 40 surrounding the first limit blocks 24 changes, namely the radius of the transmission belt 40 surrounding the driving transmission disc 21 changes smoothly, and the transmission ratio of the driving transmission disc 21 to the driven transmission disc 31 changes accordingly, stepless speed change is realized. In the operation process, the roller 53 is always pressed by the elastic force of the spring 52 connected to the tensioner 51, so that the transmission belt 40 is always kept in a tensioned state, and the transmission belt 40 is prevented from loosening after the position of the first limit block 24 changes to cause kinetic energy loss and poor transmission effect.

Buncher foundation first stopper 24's position is controlled initiative driving disk 21 with driven transmission dish 31 participates in driven actual diameter's size, provides a brand-new structure of adjusting the driving disk diameter variable speed drive unit 10 is according to adjusting behind the output power, first stopper 24's position changes immediately, makes initiative driving disk 21 with driven transmission dish 31's actual diameter takes place level and smooth change to level and smooth change initiative driving disk 21 with driven transmission dish 31's drive ratio realizes infinitely variable.

Further, the second shift adjusting unit 30 can also assist shifting, as with the first shift adjusting unit 20. The second bevel gears 32 can also be meshed with a toothed ring for inputting power, the rotation direction of the toothed ring is opposite to that of the transmission toothed ring 151, when the toothed ring rotates, the second bevel gears 32 meshed with the toothed ring rotate along with the toothed ring, the rotation direction of the toothed ring is opposite to that of the first bevel gears 22, the second worm gears 33 fixed with the toothed ring are driven to rotate in the same direction, and the second limit blocks 34 are enabled to rotate upwards or downwards relative to the second worm gears 33, and the rotation direction of the second limit blocks is opposite to that of the first limit blocks 24. The length of the transmission belt 40 around the outer part of the second limit blocks 34 is changed in the direction opposite to the first limit blocks 24, that is, the radius of the transmission belt 40 around the driving transmission disc 21 is smoothly changed, and the radius of the transmission belt 40 around the driven transmission disc 31 is smoothly changed in the opposite direction, so that the speed of changing the transmission ratio of the driving transmission disc 21 and the driven transmission disc 31 is increased, and stepless speed change is better realized.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims

1. A continuously variable transmission characterized in that: comprises that

The variable-speed driving unit comprises a motor and a transmission shaft, wherein one end of the transmission shaft is in transmission connection with the motor, and the other end of the transmission shaft is sleeved with a transmission gear ring;

the first speed change adjusting unit comprises a driving transmission disc, a plurality of first bevel gears, a plurality of first worms and a plurality of first limiting blocks, wherein the plurality of first bevel gears, the plurality of first worms and the plurality of first limiting blocks are arranged on the driving transmission disc, the transmission shaft is coaxial with the driving transmission disc, the first bevel gears are arranged in a surrounding manner at equal intervals along the circumferential direction of the transmission gear ring and are meshed with the transmission gear ring, each first worm is coaxially fixed with one first bevel gear, each first limiting block is screwed on one first worm, and the distances between the centers of circles of the first limiting blocks and the driving transmission disc are equal;

the second variable speed adjusting unit comprises a driven transmission disc and a plurality of second limiting blocks arranged on the driven transmission disc, and the distances between the second limiting blocks and the circle center of the driven transmission disc are equal;

and the driving belt surrounds the outer profiles of the first limit blocks and the second limit blocks, and can transmit the kinetic energy of the driving transmission disc to the driven transmission disc.

2. A continuously variable transmission as recited in claim 1, wherein: the transmission belt is also provided with a tensioning unit.

3. A continuously variable transmission as claimed in claim 2, wherein: the tensioning unit comprises a tensioner, a spring and a roller; the spring is arranged between the tensioner and the roller, and the roller presses on the transmission belt.

4. A continuously variable transmission as recited in claim 1, wherein: the second variable speed adjusting unit further comprises a plurality of second bevel gears and a plurality of second worms, the second worms are arranged on the driven transmission disc, the radius of the driven transmission disc is uniformly distributed on the driven transmission disc, each second worm is close to one end of the circle center of the driven transmission disc and one second bevel gear are coaxially fixed, and each second limiting block is respectively screwed on one second worm.

5. A continuously variable transmission as recited in claim 1, wherein: the variable speed drive unit further comprises a planetary carrier, a driven gear set and an internal ring gear; the planetary gear carrier is in transmission connection with the motor, the driven gear set is meshed with the planetary gear carrier and the internal gear ring, and the internal gear ring is connected with the transmission shaft.

6. A continuously variable transmission as recited in claim 5, wherein: the driven gear set comprises a plurality of driven gears and a plurality of gear fixing shafts; and two ends of each gear fixing shaft are respectively fixed with one driven gear, the driven gears are meshed with the internal gear ring, and the gear fixing shafts are connected with the planetary gear carrier.