A variable speed device and control method

Abstract

The application discloses a variable speed device, which comprises a steering motor, a V-shaped belt, a ball gear nut, a stepless adjusting belt tensioning device and a stepless speed regulation adjusting gear device, wherein the stepless speed regulation adjusting gear device is arranged at the output end of the steering motor. When the V-shaped belt is worn out after long time operation, the transmission ratio is reduced, at this time, the stepless adjusting belt tensioning device plays a regulating role, the tensioning degree is adjusted, the transmission ratio is improved, and the torque is increased, so that the requirement can be met. When the motor works at a lower level or the torque is reduced, and other unfavorable factors, the torque output by the motor is reduced, the stepless speed regulation adjusting gear device is adjusted to make the inclined pulley move to both sides synchronously, at this time, the stepless adjusting belt tensioning device also needs to work synchronously to adjust the tensioning degree, finally, the transmission ratio and the torque are improved, and the torque of the ball gear nut reaches the required requirement.

Description

Technical Field

[0001] This invention relates to the field of mechanical transmission system technology, specifically to a transmission device and control method. Background Technology

[0002] The CVT system mainly includes basic components such as the drive pulley assembly (22), the driven pulley assembly (24), the metal belt (23), and the hydraulic pump. The metal belt (23) consists of two bundles of metal rings and hundreds of metal plates. Both the drive pulley assembly (22) and the driven pulley assembly (24) are composed of movable discs and fixed discs. The pulley on the side closest to the oil cylinder can slide on the shaft, while the other side is fixed. Both the movable disc and the fixed disc are conical structures, and their conical surfaces form V-grooves to mesh with the V-shaped metal transmission belt. The power output from the engine output shaft is first transmitted to the drive pulley of the CVT, then transmitted to the driven pulley through the V-shaped transmission belt, and finally transmitted to the wheels through the reducer and differential to drive the car. During operation, the working radius of the engagement between the conical surfaces of the drive pulley and the driven pulley and the V-shaped transmission belt is changed by the axial movement of the movable discs of the drive pulley and the driven pulley, thereby changing the transmission ratio. The axial movement of the movable disc is achieved by the computer adjusting the hydraulic pump cylinder pressure of the drive wheel and driven wheel according to the needs of the car's driving. Since the working radius of the drive wheel and driven wheel can be continuously adjusted, stepless speed change is realized.

[0003] The existing transmission is carried out through a metal belt 23. After long-term use, the drive pulley set 22 and the driven pulley set 24 wear down and become loose. At the same time, the metal belt 23 wears down and becomes loose, which reduces the transmission efficiency. As a result, it is impossible to maintain the speed change efficiency when the vehicle is running. Therefore, there is an urgent need for a device to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a speed-changing device and control method to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a transmission device, comprising a steering motor, a V-belt, a ball gear nut, a continuously variable belt tensioning device, and a continuously variable transmission gear device. The continuously variable transmission gear device is located at the output end of the steering motor. The V-belt is sleeved on the outside of the ball gear nut and the variable speed inclined pulley. The continuously variable belt tensioning device presses on the V-belt, thereby ensuring that the V-belt is in a taut state.

[0006] Preferably, the continuously variable belt tensioning device includes a belt tension adjusting pulley, a displacement adjusting gear mechanism, and a gear-moving adjusting motor. The belt tension adjusting pulley is close to the outer side of the V-belt. The displacement adjusting gear mechanism is located on one side of the belt tension adjusting pulley and includes a frame structure and a small gear. The belt tension adjusting pulley is movably engaged with one side of the frame structure, and the small gear meshes with the inner wall of the frame structure. The output end of the gear-moving adjusting motor is located on one side of the displacement adjusting gear mechanism and is fixed at the center of the small gear. In use, the gear-moving adjusting motor drives the small gear to rotate, thereby causing the frame structure to move along the small gear. This causes the displacement adjusting gear mechanism to move and press the belt tension adjusting pulley against the outer side of the V-belt, thus adjusting the tension of the V-belt. The movement stroke of the displacement adjusting gear mechanism ensures that the V-belt remains in the required tension state even after long-term use.

[0007] Preferably, the continuously variable transmission (CVT) gear device includes a speed-regulating motor, a speed-regulating actuator, a bidirectional variable speed ball screw, a variable speed inclined pulley, a screw fixing rear end cover, a sealing ring, a gear housing, a screw drive gear, a housing front end cover, and a motor drive gear. The speed-regulating motor is fixed to one side of the housing front end cover, the gear housing is fixed to the housing front end cover, the motor drive gear is fixed at the output end of the speed-regulating motor, the screw drive gear is movably embedded inside the housing front end cover, the screw fixing rear end cover is embedded and fixed to one side of the gear housing, the bidirectional variable speed ball screw movably passes through the screw fixing rear end cover, and the sealing ring is disposed between the bidirectional variable speed ball screw and the screw fixing rear end cover to facilitate sealing between the bidirectional variable speed ball screw and the screw fixing rear end cover. At the rear end cover, the self-locking variable speed pusher is sleeved on the outside of the bidirectional variable speed ball screw. The variable speed inclined pulley is fixed on the outside of the variable speed pusher. After a long period of operation, the wear of the V-belt reduces the transmission ratio. At this time, the continuously variable belt tensioning device plays a role in adjustment, adjusting the tension to increase the transmission ratio and thus increase the torque to meet the requirements. When the motor degrades or the torque decreases, or other unfavorable factors cause the motor output torque to decrease, the continuously variable gear adjustment device can be adjusted to make the inclined pulley move synchronously to both sides. At this time, the continuously variable belt tensioning device also needs to work synchronously to adjust the tension, ultimately increasing the transmission ratio and torque, so that the ball gear nut torque meets the requirements.

[0008] Preferably, the V-belt is elastic, which increases the transmission ratio of the V-belt and reduces the preload.

[0009] Preferably, the lead screw power gear has three parts, all of which mesh with the motor drive gear.

[0010] Preferably, both the lead screw power gear and the motor drive gear are helical gears, which provide a larger transmission ratio compared to normal gears, and have good meshing performance, smooth transmission, and low impact, vibration and noise.

[0011] Preferably, the bidirectional variable speed ball screw is coaxially mounted with the screw drive gear.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] During prolonged operation, wear and tear on the V-belt reduces the transmission ratio. In this case, the continuously variable belt tensioning device adjusts the tension, increasing the transmission ratio and thus boosting the torque to meet requirements. Conversely, when factors such as motor downgrading or reduced torque cause a decrease in output torque, the continuously variable gear mechanism can be adjusted to move the inclined pulley synchronously to both sides. In this case, the continuously variable belt tensioning device must also operate synchronously to adjust the tension, ultimately increasing the transmission ratio and torque to achieve the required torque for the ball gear nut. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the working state of a continuously variable transmission (CVT) device in the prior art.

[0015] Figure 2 This is a schematic diagram of the working state of a continuously variable transmission (CVT) device in the prior art.

[0016] Figure 3 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 4 This is a schematic diagram of the displacement adjusting gear mechanism of the present invention;

[0018] Figure 5 This is a cross-sectional view of the gear housing of the present invention;

[0019] Figure 6 This is the first flowchart of the present invention;

[0020] Figure 7 This is the second flowchart of the present invention.

[0021] In the diagram: 1. Steering motor; 2. V-belt; 3. Ball gear nut; 4. Steplessly adjustable belt tensioning device; 5. Steplessly variable speed adjustment gear device; 6. Belt tension adjustment pulley; 7. Displacement adjustment gear mechanism; 8. Gear movement adjustment motor; 9. Variable speed adjustment motor; 10. Variable speed propeller; 11. Bidirectional variable speed ball screw; 12. Variable speed inclined pulley; 13. Motor drive gear; 14. Screw fixing rear end cover; 15. Housing front end cover; 16. Sealing ring; 17. Gear housing; 18. Screw drive gear. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figure 3-7 The present invention provides a technical solution: a transmission device, including a steering motor 1, a V-belt 2, a ball gear nut 3, a continuously variable belt tensioning device 4, and a continuously variable transmission gear device 5. The continuously variable transmission gear device 5 is located at the output end of the steering motor 1 via a bearing. The V-belt 2 is sleeved on the outside of the ball gear nut 3 and the variable speed inclined pulley 12. The continuously variable belt tensioning device 4 presses on the V-belt 2, and the continuously variable belt tensioning device 4 ensures that the V-belt 2 is in a taut state. The V-belt 2 has elasticity, which increases the transmission ratio of the V-belt 2 and reduces the preload.

[0024] The continuously variable belt tensioning device 4 includes a belt tension adjusting wheel 6, a displacement adjusting gear mechanism 7, and a gear movement adjusting motor 8. The belt tension adjusting wheel 6 is close to the outside of the V-belt 2. The displacement adjusting gear mechanism 7 is located on one side of the belt tension adjusting wheel 6. The displacement adjusting gear mechanism 7 includes a frame structure and a small gear. The belt tension adjusting wheel 6 is movably engaged on one side of the frame structure, and the small gear meshes with the inner wall of the frame structure. The output end of the gear movement adjusting motor 8 is located on one side of the displacement adjusting gear mechanism 7. The output end of the gear movement adjusting motor 8 is fixed to the center position of the small gear through a coupling. In use, the gear movement adjusting motor 8 drives the small gear to rotate, thereby causing the frame structure to move along the small gear. This causes the displacement adjusting gear mechanism 7 to drive the belt tension adjusting wheel 6 to move and press the outside of the V-belt 2, thus adjusting the tension of the V-belt 2. The movement stroke of the displacement adjusting gear mechanism 7 ensures that the V-belt 2 remains in the required tension state even after long-term use.

[0025] The continuously variable transmission (CVT) gear mechanism 5 includes a speed-regulating motor 9, a speed-regulating thruster 10, a bidirectional variable speed ball screw 11, a variable speed inclined pulley 12, a screw fixing rear end cover 14, a sealing ring 16, a gear housing 17, a screw drive gear 18, a housing front end cover 15, and a motor drive gear 13. The speed-regulating motor 9 is bolted to one side of the housing front end cover 15. The gear housing 17 is bolted to the housing front end cover 15. The motor drive gear 13 is fixed to the output end of the speed-regulating motor 9 via a coupling. The screw drive gear 18 is movably embedded inside the housing front end cover 15. Three screw drive gears 18 mesh with the motor drive gear 13. Both the screw drive gear 18 and the motor drive gear 13 are helical gears, providing a larger transmission ratio compared to normal gears, with good meshing, smooth transmission, and low impact, vibration, and noise. The screw fixing rear end cover 14 is embedded and fixed to one side of the gear housing 17. The bidirectional variable speed ball screw 11 and the screw drive gear 18 are coaxially mounted. The high-speed ball screw 11 moves through the screw fixing rear end cover 14. The sealing ring 16 is located between the bidirectional variable speed ball screw 11 and the screw fixing rear end cover 14 to facilitate sealing between them. The variable speed pusher 10 with self-locking function is sleeved on the outside of the bidirectional variable speed ball screw 11. The variable speed inclined pulley 12 is fixed on the outside of the variable speed pusher 10. After a long period of operation, the wear of the V-belt 2 reduces the transmission ratio. At this time, the stepless belt tensioning device 4 plays a regulating role, adjusting the tension to increase the transmission ratio and thus increase the torque to meet the requirements. When the motor degrades or the torque decreases, the output torque of the motor decreases. The stepless speed adjustment gear device 5 can be adjusted to make the inclined pulley 12 move synchronously to both sides. At this time, the stepless belt tensioning device 4 also needs to work synchronously to adjust the tension, ultimately increasing the transmission ratio and torque, so that the torque of the ball gear nut 3 meets the requirements.

[0026] Working principle: After a long period of operation, the wear of the V-belt 2 reduces the transmission ratio. At this time, the continuously variable belt tensioning device 4 plays a regulating role, adjusting the tension to increase the transmission ratio and thus increase the torque to meet the requirements. When the motor degrades or the torque decreases, or other unfavorable factors cause the output torque of the motor to decrease, the continuously variable gear adjusting device 5 can be used to make the inclined pulley 12 move synchronously to both sides. At this time, the continuously variable belt tensioning device 4 also needs to work synchronously to adjust the tension, ultimately increasing the transmission ratio and torque, so that the torque of the ball gear nut 3 meets the requirements.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A speed change device, comprising a steering motor (1), a V-belt (2), a ball gear nut (3), a continuously variable belt tensioning device (4), and a continuously variable gear adjustment device (5), characterized in that: The continuously variable transmission gear device (5) is located at the output end of the steering motor (1). The V-belt (2) is sleeved on the outside of the ball gear nut (3) and the variable speed inclined pulley (12). The continuously variable belt tensioning device (4) presses on the V-belt (2). The continuously variable belt tensioning device (4) includes a belt tensioning speed wheel (6), a displacement adjustment gear mechanism (7), and a gear movement adjustment motor (8). The belt tensioning speed wheel (6) is close to the outside of the V-belt (2). The displacement adjustment gear mechanism (7) is located on one side of the belt tensioning speed wheel (6). The displacement adjustment gear mechanism (7) includes a frame structure and a small gear. The belt tensioning speed wheel (6) is movably engaged on one side of the frame structure. The small gear meshes with the inner side wall of the frame structure. The output end of the gear movement adjustment motor (8) is located on one side of the displacement adjustment gear mechanism (7). The output end of the gear movement adjustment motor (8) is fixed at the center position of the small gear. The continuously variable transmission (CVT) gear device (5) includes a speed-regulating motor (9), a speed-regulating thruster (10), a bidirectional speed-regulating ball screw (11), a speed-regulating inclined pulley (12), a screw fixing rear end cover (14), a sealing ring (16), a gear housing (17), a screw drive gear (18), a housing front end cover (15), and a motor drive gear (13). The speed-regulating motor (9) is fixed on one side of the housing front end cover (15), the gear housing (17) is fixed to the housing front end cover (15), the motor drive gear (13) is fixed at the output end of the speed-regulating motor (9), and the screw drive gear (14) is fixed at the output end of the motor (9). 8) The screw is embedded in the front end cover (15) of the outer shell. The screw fixing end cover (14) is embedded and fixed on one side of the gear shell (17). The bidirectional variable speed ball screw (11) moves through the screw fixing end cover (14). The sealing ring (16) is set between the bidirectional variable speed ball screw (11) and the screw fixing end cover (14) to facilitate sealing the position between the bidirectional variable speed ball screw (11) and the screw fixing end cover (14). The variable speed thruster (10) with self-locking function is sleeved on the outside of the bidirectional variable speed ball screw (11). The variable speed inclined pulley (12) is fixed on the outside of the variable speed thruster (10).

2. The speed change device according to claim 1, characterized in that: The V-belt (2) is elastic.

3. A speed-changing device according to claim 2, characterized in that: The lead screw power gear (18) is provided with three gears that mesh with the motor drive gear (13).

4. A speed-changing device according to claim 3, characterized in that: Both the lead screw power gear (18) and the motor drive gear (13) are helical gears.

5. A speed-changing device according to claim 4, characterized in that: The bidirectional variable speed ball screw (11) is coaxially mounted with the screw drive gear (18).

6. A control method for a transmission device according to any one of claims 1-5, characterized in that: During long-term operation, the wear of the V-belt (2) reduces the transmission ratio. At this time, the stepless belt tensioning device (4) plays a regulating role, adjusting the tension to increase the transmission ratio and torque. When the motor is degraded or the torque is reduced, the output torque of the motor decreases. The stepless speed adjustment gear device (5) is adjusted to make the inclined pulley (12) move synchronously to both sides. Specifically, the speed adjustment motor (9) is started, and the motor drive gear (13) drives the screw power gear (18) to rotate, thereby making the bidirectional speed change ball screw (11) rotate. This causes the speed change pusher (10) to drive the speed change inclined pulley (12) to move along the bidirectional speed change ball screw (11), squeezing the V-belt (2). At this time, the stepless belt tensioning device (4) works synchronously to adjust the tension, ultimately increasing the transmission ratio and torque, so that the torque of the ball gear nut (3) meets the required requirements.

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