CN113417982B - Multi-belt transmission automatic clutch motor gear shifting fork control stepless speed change box - Google Patents
Multi-belt transmission automatic clutch motor gear shifting fork control stepless speed change box Download PDFInfo
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- CN113417982B CN113417982B CN202110668894.1A CN202110668894A CN113417982B CN 113417982 B CN113417982 B CN 113417982B CN 202110668894 A CN202110668894 A CN 202110668894A CN 113417982 B CN113417982 B CN 113417982B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H9/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members
- F16H9/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion
- F16H9/04—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes
- F16H9/12—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members
- F16H9/16—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members using two pulleys, both built-up out of adjustable conical parts
- F16H9/18—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members using two pulleys, both built-up out of adjustable conical parts only one flange of each pulley being adjustable
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D43/00—Automatic clutches
- F16D43/02—Automatic clutches actuated entirely mechanically
- F16D43/20—Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/035—Gearboxes for gearing with endless flexible members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
- F16H61/662—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/32—Gear shift yokes, e.g. shift forks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02039—Gearboxes for particular applications
- F16H2057/02043—Gearboxes for particular applications for vehicle transmissions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02086—Measures for reducing size of gearbox, e.g. for creating a more compact transmission casing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02091—Measures for reducing weight of gearbox
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/304—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by electrical or magnetic force
- F16H2063/3059—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by electrical or magnetic force using racks
Abstract
The invention relates to a multi-belt transmission automatic clutch motor gear shifting fork control stepless speed changing box, and belongs to the technical field of stepless speed changing. The invention has the advantages of low cost, simple structure, stable performance, excellent riding comfort, operability and fuel economy of the CVT stepless automatic gearbox, overcomes and solves a plurality of problems of the existing gearbox, realizes the automatic clutch function, the power transmission function and the speed change function through the coordinated operation of the gearbox shell, the multi-belt transmission device, the transmission ratio control device and the clutch device, and meets the use requirements of the technical field of the existing stepless gearbox.
Description
Technical Field
The invention belongs to the technical field of manufacturing of continuously variable automatic gearboxes.
Background
1. Taking an automobile as an example, the existing automobile gearboxes are roughly divided into two types, namely a manual gearbox and an automatic gearbox, the manual gearbox has the advantages of low manufacturing cost, high technical maturity and stable performance, the disadvantage of poor riding comfort and complex operation, the operation of frequently matching with a clutch is difficult to master and has higher requirements on the driving skill of a driver, the automatic gearbox is divided into a multi-stage automatic gearbox and a steel belt stepless automatic gearbox (CVT), the multi-stage automatic gearbox transfers the gear shifting action which needs manual operation of the driver to a mechanical device and a hydraulic device, the disadvantage of general riding comfort and obviously lagging the speed of the automatic gear shifting action to the manual operation and obvious pause feeling, the gearbox is more complex, the technical requirement on processing and manufacturing is higher, the steel belt stepless automatic gearbox (CVT) has the advantages of excellent riding comfort, operability and fuel economy, the disadvantage of being difficult to manufacture, the high torque, small and easy to break, the maintenance expense is high, the key and the technical disadvantage of being capable of overcoming the two technical defects of slipping of the automatic gearbox at the same time.
2. At present, the engine of the automobile and the gearbox are connected through a clutch or a hydraulic coupler to transmit power, so that a part of power is lost, the weight, the volume and the axial size of the gearbox are further increased, and the whole structural arrangement and the performance of the automobile are not facilitated.
3. The large torque, small volume and low oil consumption of the existing continuously variable transmission are one of the main directions of development.
Disclosure of Invention
In view of the problems existing in the prior art, the invention aims to solve and overcome the technical problems, namely the automatic stepless gearbox with the automatic clutch function, which has the advantages of excellent riding comfort, operability, fuel economy, quick speed increasing, light weight, small volume, simple structure, low manufacturing cost, good performance, easy maintenance and automatic clutch motor gear shift fork control.
The technical scheme adopted for achieving the purpose comprises the following steps: a gearbox shell, a multi-belt transmission device, a transmission ratio control device and an automatic clutch device.
Detailed Description
The transmission housing is divided into a lower housing and an upper cover, (the lower housing and the upper cover are not limited to an upper structure and a lower structure, but only express that the lower housing and the upper cover are formed by two parts, such as a plurality of parts for convenient manufacturing and processing), the lower housing and the upper cover are fastened and combined into a whole of the transmission housing by screws, the lower housing of the transmission is provided with a multi-belt transmission device and an automatic clutch device, and the upper cover is provided with a transmission ratio control device.
The multi-belt transmission device is provided with a power input shaft and a power output shaft, the power input shaft and the power output shaft are arranged on a lower shell of the transmission case at intervals in parallel through bearings, the two shafts are long optical axes, the power input end and the output end are provided with splines, the power output end can be on the same side as the power input end or on different sides, and can also be simultaneously output from two sides, a pin hole and a ball sliding groove are arranged at positions of the shaft body, which correspond to the positions of the pulleys, a thrust bearing is arranged at the joint of the power input shaft and the lower shell of the transmission case, the power input shaft is provided with 3 fixed parts of driving pulleys which are arranged at equal intervals (can also be increased or decreased according to the actual requirement of transmission power), the fixed parts of the driving pulleys and the power input shaft are fixedly combined through fastening pins, so as to ensure synchronous rotation of the fixed parts of the driving pulleys and the power input shaft, the sliding parts of the driving pulleys are arranged on the same side of the driving pulleys at equal distances (can also be increased or decreased according to the requirement of power transmission), the sliding parts of the driving pulleys can only axially move, the fixed parts of the driving pulleys and the sliding parts of the driving pulleys are arranged on the same side, the driving pulleys are provided with conical surfaces of the inner sides of the driving pulleys, the sliding grooves are formed by the sliding grooves of the driving pulleys, the fixed part of the driving pulleys are in the same type, and the driving pulleys are engaged with the sliding grooves of the driving pulleys, and the sliding grooves of the driving pulleys are formed by the sliding shafts, and the sliding shafts of the driving shafts are engaged with the sliding shafts, a clutch needle bearing is arranged on a power input shaft between a sliding part and a fixed part of each driving pulley, a thrust spring is arranged between each clutch needle bearing and the fixed part of the driving pulley, a limit retainer is arranged on the other side, the purpose is that when a V-shaped belt groove of the driving pulley is in the widest state, the position of the clutch needle bearing is controlled to be in the middle of the bottom edge of the V-shaped belt groove, a circle of U-shaped groove is arranged in the middle of an outer ring of each clutch needle bearing, each needle bearing can axially slide, a proper radial clearance is arranged between the fixed part of each driving pulley, a shaft hole of the sliding part and the side adjacent to the clutch needle bearing and the power input shaft neck, so that the sliding part of each driving pulley can slide to a close state to the fixed part of the driving pulley, 3 equidistant driven pulley fixed parts and 3 equidistant driven pulley sliding parts (which can be increased or decreased according to the power transmission requirement and are in one-to-one correspondence with the fixed part of the driving pulley) are arranged on the power output shaft, the fixed part of the driven pulley just corresponds to the sliding part of the driving pulley, the fixed part of the driving pulley can just move to the fixed part of the driving pulley through the ball bearing, and the fixed part of each driving pulley can be engaged with the ball bearing hole of the ball bearing in the fastening groove through the fastening principle that the fixed part of the driving pulley is just above the driving pulley is engaged with the inner wall of the driving pulley, the fixed part and the sliding part of the driven pulleys synchronously rotate, the outer side of the sliding part of each driven pulley is provided with a pressure spring of the same type, one side of the pressure spring is pressed on the other side of the outer side of the sliding part of the driven pulley on a clamping ring (the outermost pressure spring is used for pressing the other pressure spring) fixed on a power output shaft through a fastening pin, the other pressure spring is pressed on the outer side of the fixed part of the driven pulley on the adjacent side, the other side of the pressure spring is pressed on the outer side of the sliding part of the driven pulley, the sliding part of each driven pulley is forced to abut against the fixed part of the driven pulley, the inner sides of the fixed part and the sliding part of each driven pulley are conical surfaces with inclined angles, V-shaped grooves are formed on the two sides of the fixed part and the sliding part of the driven pulley oppositely, the inclined angles of the V-shaped grooves of all driving pulleys and the driven pulleys are the same, the same special transmission belt with isosceles trapezoid cross section (the inclined angle of the isosceles bevel edge of the transmission belt is the same as the inclined angle of the V-shaped grooves of the driving pulleys and the inner ring of the transmission belt is specially provided with a circle of U-shaped bulge) is specially arranged in the middle of the transmission belt, and the power transmission belt is connected, and the power transmission process of the driving pulley, the driving pulley and the driving pulley is driven is finished.
The transmission ratio control device is arranged on the upper cover of the gearbox, the transmission ratio control device has two preferable schemes, one is a sliding shifting fork control method and the other is a fixed shifting fork control method, and the sliding shifting fork control method comprises the following steps: the device comprises a sliding groove, a rack, a sliding rail, a 3-joint equidistant sliding shifting fork (the number of the shifting fork is consistent with the number of the sliding parts of all driving pulleys and can be increased or decreased according to the transmission requirement), a reduction gear set and a control motor, wherein the sliding rail is arranged on the inner side of an upper cover of a gearbox and is parallel to a power input shaft and is close to the position of the power input shaft, the 3-joint equidistant sliding shifting fork body is provided with the sliding groove which is parallel to the power input shaft, the sliding groove is perpendicular to the shifting fork, the shifting fork is arranged on the sliding rail in a perpendicular state with the sliding rail through the sliding groove and can only control the shifting fork to slide in the axial direction of the power input shaft, the shifting fork (the number of the shifting fork can be increased or decreased according to the power transmission requirement and is consistent with the number of the sliding parts of the driving pulleys) is respectively pressed on a pressure bearing on the outer side of the sliding part of the driving pulleys, the shifting fork body and the side parallel to the sliding rail groove is provided with the rack, the rack is meshed with a pinion of a speed reducing gear set arranged at the position of an opening at the outer side of the upper cover of the gearbox through an opening at the upper cover of the gearbox, a big gear of the speed reducing gear set is meshed with a gear arranged on a control motor at the corresponding position at the outer side of the upper cover of the gearbox, so that the axial sliding control of a 3-joint sliding shifting fork by the motor is realized, the 3-joint sliding shifting fork presses 3 pressure bearings arranged on a driving pulley sliding part under the control of the motor and the speed reducing gear set, when the pressure of the shifting fork is larger than the pressure of a spring arranged on the driving pulley sliding part to the outer side of the driving pulley sliding part, the driving pulley sliding part gradually approaches to a fixed part of the driving pulley sliding part under the condition that the transmission device continuously rotates, and a transmission belt in a V-shaped belt groove of the driving pulley is extruded, the working radius of the driving belt on the driving belt pulley is gradually increased, and the working radius of the driving belt in the V-shaped belt groove on the driven belt pulley is forced to gradually decrease because the length of the driving belt is unchanged, so that the rotation speed ratio of the power input shaft and the power output shaft is gradually decreased from large to large, and the following formula is achieved: the transmission ratio = driving wheel rotation speed/driven wheel rotation speed, it is known that the transmission ratio is also gradually reduced, conversely, when the 3-joint sliding shifting fork reduces the pressure to the pressure bearing on the sliding part of each driving pulley under the control of the motor and the reduction gear set, and the pressure is smaller than the pressure of the spring on the driven pulley to the sliding part, the sliding part of each driving pulley is gradually far away from the fixed part, the spring on each driven pulley gradually approaches the fixed part to press the transmission belt in the V-shaped belt groove of each driving pulley under the pressure of the spring on the sliding part of each driven pulley, so that the working radius of the transmission belt in the V-shaped belt groove of each driven pulley is gradually increased, and because the length of the transmission belt is unchanged, the working radius of the transmission belt in the V-shaped belt groove of each driving pulley is forced to gradually reduce, thereby completing the small gradual increase of the rotation ratio of the power input shaft and the power output shaft, and the transmission ratio is completed according to the formula: the transmission ratio=the rotation speed of the driving wheel/the rotation speed of the driven wheel, and the transmission ratio of the power input shaft and the power output shaft is gradually increased from small to small, so that the transmission ratio control device can control the transmission ratio of the multi-belt transmission device, and the purpose of stepless speed change is achieved.
The other fixed shifting fork control method is to fix 3-joint equidistant shifting forks on the lower shell of the gearbox at one side of the power input shaft, so that each shifting fork is just pressed on a pressure bearing at the outer side of the sliding part of the driving belt pulley to limit the axial movement of the sliding part of the driving belt pulley, the power input shaft and the driving belt pulley fixed part on each shaft can integrally axially slide, the axial pressure and the moving distance of the input shaft are regulated through a specific device, the aim of regulating the transmission ratio can be achieved, the two preferred transmission ratio control methods and the two transmission ratio control methods are realized, one is screw rod and lever control, the other is hydraulic shifting fork control, the aim is the same, the specific implementation method is different, and the detailed description is omitted.
The automatic clutch device is another protruding function in the multi-belt transmission device, under the control of the transmission ratio control device, the 3-joint shifting fork gradually reduces the pressure to the pressure bearing on the sliding part of all the driving belt pulleys until no pressure exists, the V-shaped belt groove of each driving belt pulley reaches the bottom edge to be the widest under the control of the extrusion of the driving belt and the shifting fork, the maximum width of the V-shaped belt groove of each driving belt pulley is controlled to be larger than 1 millimeter of the width of the driving belt in the V-shaped belt groove of each driving belt pulley, the sliding part of each driven belt pulley is pushed by the outside pressure spring to ensure that the working radius of the driving belt in the narrowest groove reaches the maximum, the U-shaped bulge on the inner ring of each driving belt is forced to be pressed on the outer ring of the clutch needle bearing between the fixed part and the sliding part of the driving belt pulley and the U-shaped bulge on the inner ring of the driving belt pulley is meshed with the U-shaped groove on the outer ring of the needle bearing, so as to ensure that the driving belt is positioned in the middle of the bottom edge of the driving belt pulley and is not contacted with the two sides of the V-shaped belt groove of the driving belt pulley, because the two sides of the V-shaped belt groove of each driving belt pulley are pressureless and contact-less to the two sloping sides of each driving belt, the input shaft and the driving belt pulley form relative rotation with the driving belt through the rotation of the clutch needle bearing, the power transmission is completed and cut off on the clutch needle bearing, thus the separation function of a clutch is realized, the separation action is completed, when the transmission ratio control device applies pressure to the pressure bearings on the sliding parts of all driving belt pulleys, the two sides of the V-shaped belt groove of each driving belt pulley gradually press the two sloping sides of the driving belt in the groove, the friction force gradually increases along with the increase of the pressure, the working radius of each driving belt is gradually increased, the inner ring of the belt leaves the outer ring of the clutch needle bearing, and under the combined action of pressure and friction force, each driving belt and each driving belt gradually change into asynchronous rotation from relative rotation to finally achieve synchronous rotation (the process is very short of course), so that the power cut off on the clutch needle bearing is restored again, which is equivalent to the flexible combination effect of the clutch, and the clutch operation is completed through the method and the device.
The present invention and its embodiments have been described above without limitation, but one of the embodiments of the present invention is not limited to the actual structure. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present invention.
Claims (3)
1. A multi-belt drive automatic clutch motor gear shift fork controlled continuously variable transmission comprising: gearbox shell, many belt drive, drive belt, transmission ratio controlling means, automatic clutch, its characterized in that: a continuously variable transmission with a plurality of driving belts connected with a plurality of groups of driving pulleys and driven pulleys with adjustable working radii and capable of controlling the transmission ratio;
the belt transmission device comprises a plurality of groups of driving belt pulleys and a plurality of groups of driven belt pulleys which are arranged in parallel and are respectively and correspondingly arranged on a power input shaft and an output shaft, each group of belt pulleys consists of a fixed part and a sliding part, the fixed part is fixedly combined with the transmission shaft through a fastening pin, the sliding part is slidably combined with the transmission shaft through a sliding groove and a ball, so as to ensure that the sliding part of the belt pulleys and the transmission shaft synchronously rotate, the inner sides of the belt pulleys are conical surfaces with inclined angles and form V-shaped belt grooves relatively, the inclined angles of the V-shaped belt grooves of all the belt pulleys are the same, the corresponding driving belt pulleys and the driven belt pulleys of each group are connected through special transmission belts with isosceles trapezoid cross sections, the inclined angles of two isosceles inclined edges of each transmission belt are the same as the inclined angles of the V-shaped belt grooves of all the belt pulleys, the outer side of the sliding part of each driving belt pulley is provided with a pressure bearing of the same model, the outer side of the sliding part of each driving belt pulley is provided with a pressure spring, the sliding part of each group of driven belt pulley is always kept close to the fixed part, the clutch bearings are arranged between the fixed parts of each driving belt pulley, and the driving belt pulleys are not close to the power input shaft, and the driving belt pulleys are not in a proper radial state, and the driving belt pulleys are not close to the driving belt shafts are moved to the driving belt pulleys are arranged, and the driving belt pulleys are in a proper state and the driving belt shafts are not close to the driving belt shafts, and the driving belt shafts are connected to the driving belt shafts and the driving belt transmission shafts are respectively, and the driving belt transmission shafts are connected and the driving belt shafts and the driving shafts and the shafts are respectively;
the transmission belts are special triangular transmission belts with isosceles trapezoid cross sections, the inclination angles of two oblique sides of each transmission belt are consistent with those of V-shaped belt grooves of all belt pulleys in the transmission device, and a circle of U-shaped bulges are arranged in the middle of the inner side of each transmission belt and can be just meshed with the U-shaped grooves of the clutch needle bearing outer ring;
the automatic clutch device comprises a thrust spring arranged between each clutch needle bearing and a fixed part of each driving pulley, a positioning clamping ring arranged on a power input shaft at the other side, the positioning clamping ring is used for controlling the clutch needle bearing to be positioned in the middle of the bottom edge of the V-shaped belt groove when the V-shaped belt groove of the driving pulley is in the widest state, a circle of U-shaped groove is arranged in the middle of an outer ring of each clutch needle bearing, the U-shaped groove is just meshed with the U-shaped bulge of the inner ring of the driving belt, when the transmission ratio control device does not apply pressure to all driving pulley sliding parts, under the continuous rotation state of the transmission device, the two sides of the V-shaped belt groove of the driving pulley are under the extrusion of the driving belt, and under the control of the shifting fork, the bottom edge of the belt groove reaches the widest, the width is larger than 1 millimeter of the cross section width of the driving belt, the pushing lower driving belt of the pressure spring on the outer side of the driving pulley is increased to the maximum working radius of the driving belt on the driven pulley, the inner side of the driving belt is forced to be positioned outside the clutch needle bearing on the middle of the driving pulley, the U-shaped bulge in the driving belt is meshed with the U-shaped bulge in the driving pulley, the driving pulley is meshed with the U-shaped bulge in the driving pulley, when the driving pulley is meshed with the U-shaped bulge in the driving pulley, and the pressure on the driving pulley is meshed with the U-shaped bulge in the driving pulley, and the outer side of the driving belt is meshed with the driving pulley, and the pressure spring is separated from the driving pulley by the driving pulley, and the driving pulley, when the driving pulley is in the pressure has no pressure and has a certain effect, and the corresponding pressure ratio, when the driving belt and has a certain effect and has a good rotation, the sliding part of the driving belt pulley starts to squeeze the driving belt towards the inner side of the fixed part of the driving belt pulley, so that the inner side of the driving belt leaves the clutch needle bearing, the driving belt gradually rotates synchronously with the driving belt pulley under the action of pressure and friction force, the power transmission is connected, and the combination action is completed and is equivalent to the flexible combination action of the clutch;
the transmission ratio control device comprises a sliding shifting fork control device and a fixed shifting fork control device.
2. The multi-belt drive automatic clutch motor gear shift fork controlled continuously variable transmission of claim 1, wherein: the sliding shifting fork control device comprises a plurality of parallel-mounted equidistant shifting forks, the number of the shifting forks is consistent with the number of sliding parts of each driving belt pulley and is positioned at corresponding positions, a speed reducing gear, a control motor, a sliding chute, a sliding rail and a rack are directly arranged on a main body of the multi-mounted shifting fork in parallel and are vertically arranged with each shifting fork, the sliding chute and the rack are parallel to a power input shaft, the sliding rail is arranged on the inner side of an upper cover of a gearbox and is parallel to the power input shaft, each shifting fork on the multi-mounted shifting fork is respectively pressed on a pressure bearing on the outer side of the sliding part of each driving belt pulley through the sliding chute on the main body, the rack on one side of the shifting fork main body is meshed with a pinion of the speed reducing gear arranged at the corresponding position on the outer side of the upper cover of the gearbox through an opening of the upper cover of the gearbox, and a large gear of the speed reducing gear is meshed with a gear arranged on the control motor at the corresponding position on the outer side of the upper cover of the gearbox, so that the axial sliding control of the motor on the multi-mounted shifting fork is completed, the driving belt pulley sliding control of the driving belt pulley of the control motor is realized, the driving belt pulley sliding control of the driving belt pulley of the control motor and the driving belt pulley is controlled, the driving belt ratio is also controlled, and the driving belt ratio is also achieved.
3. The multi-belt drive automatic clutch motor gear shift fork controlled continuously variable transmission of claim 1, wherein: the fixed shifting fork control device comprises a plurality of equidistant shifting forks which are fixedly arranged on a lower shell of the gearbox in parallel with the power input shaft, each shifting fork is just pressed on a pressure bearing at the outer side of the sliding part of each driving belt pulley to limit the axial sliding of the shifting forks, the power input shaft and the fixed parts of the driving belt pulleys on the shafts can axially slide together, and the fixed parts of each driving belt pulley and the input shaft can also change the distance between the fixed parts of the driving belt pulley and the sliding parts when the fixed parts of the driving belt pulleys and the input shaft slide together because the sliding parts of the driving belt pulleys are limited by the fixed shifting forks and can not axially slide together.
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