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CN-116576228-B - Speed change device and control method

CN116576228BCN 116576228 BCN116576228 BCN 116576228BCN-116576228-B

Abstract

The invention discloses a speed change device which comprises a steering motor, a V-shaped belt, a ball gear nut, a stepless regulation belt tensioning device and a stepless speed change regulation gear device, wherein the stepless speed change regulation gear device is arranged at the output end position of the steering motor. When the motor works in a degradation mode or the torque is reduced due to factors disadvantageous in various aspects such as the torque reduction, the torque output by the motor is reduced, the bevel belt pulley can synchronously move to two sides through adjusting the stepless speed change adjusting gear device, and the stepless speed change adjusting gear device also needs to synchronously work, so that the tension is adjusted, the transmission ratio and the torque are finally improved, and the torque of the ball gear nut can meet the required requirements.

Inventors

  • REN XIN
  • WANG LEI
  • CAO QI

Assignees

  • 北京英创汇智汽车技术有限公司

Dates

Publication Date
20260512
Application Date
20230423

Claims (6)

  1. 1. The speed change device comprises a steering motor (1), a V-shaped belt (2), a ball gear nut (3), a stepless regulation belt tensioning device (4) and a stepless speed change regulation gear device (5), and is characterized in that the stepless speed change regulation gear device (5) is arranged at the output end position of the steering motor (1), the V-shaped belt (2) is sleeved on the outer sides of the ball gear nut (3) and a speed change inclined belt pulley (12), and the stepless regulation belt tensioning device (4) is pressed on the V-shaped belt (2); The stepless regulation belt tensioning device (4) comprises a regulation belt tightness fixed speed wheel (6), a displacement regulation gear mechanism (7) and a gear movement regulation motor (8), wherein the regulation belt tightness fixed speed wheel (6) is clung to the outer side of a V-shaped belt (2), the displacement regulation gear mechanism (7) is arranged on one side of the regulation belt tightness fixed speed wheel (6), the displacement regulation gear mechanism (7) comprises a frame structure and a pinion, the regulation belt tightness fixed speed wheel (6) is movably clamped on one side of the frame structure, the pinion is meshed on the inner side wall of the frame structure, the output end of the gear movement regulation motor (8) is arranged on one side of the displacement regulation gear mechanism (7), and the output end of the gear movement regulation motor (8) is fixed at the center position of the pinion; The stepless speed change adjusting gear device (5) comprises a speed change adjusting motor (9), a speed change propeller (10), a bidirectional speed change ball screw (11), a speed change inclined belt pulley (12), a screw fixed rear end cover (14), a sealing ring (16), a gear housing (17), a screw power gear (18), a housing front end cover (15) and a motor driving gear (13), wherein the speed change adjusting motor (9) is fixed on one side of the housing front end cover (15), the gear housing (17) is fixed with the housing front end cover (15), the motor driving gear (13) is fixed at the output end position of the speed change adjusting motor (9), the screw power gear (18) is movably embedded in the housing front end cover (15), the screw fixed rear end cover (14) is embedded and fixed on one side of the gear housing (17), the bidirectional speed change ball screw (11) movably penetrates through the screw fixed rear end cover (14), the sealing ring (16) is arranged between the bidirectional speed change ball screw (11) and the screw fixed rear end cover (14) to facilitate sealing the position between the bidirectional speed change ball screw (11) and the screw fixed rear end cover (14), the speed change ball screw (10) is sleeved on the outer side of the speed change ball screw (11), the variable speed bevel pulley (12) is fixed on the outer side of the variable speed propeller (10).
  2. 2. A transmission according to claim 1, wherein the V-belt (2) has stretchability.
  3. 3. A gear change device according to claim 2, characterized in that the screw power gear (18) is provided with three gears each engaging with the motor drive gear (13).
  4. 4. A speed change device according to claim 3, wherein the screw power gear (18) and the motor drive gear (13) are both helical gears.
  5. 5. A transmission according to claim 4, wherein the bi-directional transmission ball screw (11) is mounted coaxially with the screw power gear (18).
  6. 6. A control method of a speed change device according to any one of claims 1 to 5, characterized in that: When the motor is degraded or the torque is reduced, the torque output by the motor is reduced, the bevel belt pulley (12) synchronously moves to two sides by adjusting the stepless speed change adjusting gear device (5), specifically, the speed change adjusting motor (9) is started to drive the screw power gear (18) to rotate through the motor driving gear (13), so that the bidirectional speed change ball screw (11) rotates, the speed change propeller (10) drives the speed change bevel belt pulley (12) to move along the bidirectional speed change ball screw (11) to squeeze the V-shaped belt (2), and the stepless speed change belt tensioning device (4) synchronously works, adjusts the tension and finally improves the transmission ratio and the torque, so that the torque of the ball gear nut (3) meets the required requirement.

Description

Speed change device and control method Technical Field The invention relates to the technical field of mechanical speed changing systems, in particular to a speed changing device and a control method. Background The CVT system mainly comprises a driving wheel set (22), a driven wheel set (24), a metal belt (23), a hydraulic pump and other basic components, wherein the metal belt (23) consists of two metal rings and hundreds of metal sheets, the driving wheel set (22) and the driven wheel set (24) consist of a movable disc and a fixed disc, a belt wheel on one side close to an oil cylinder can slide on a shaft, the other side is fixed, the movable disc and the fixed disc are of conical surface structures, the conical surfaces of the movable disc and the fixed disc form V-shaped grooves to be meshed with a V-shaped metal transmission belt, the power output by an output shaft of an engine is firstly transmitted to a driving wheel of the CVT, then transmitted to a driven wheel through the V-shaped transmission belt and finally transmitted to wheels through a speed reducer and a differential mechanism to drive an automobile, and when the CVT system works, the working radius of the driving wheel, which is meshed with the V-shaped transmission belt, is changed through axial movement of the driving wheel and the movable disc of the driven wheel. The axial movement of the movable disc is realized by a computer according to the running requirement of the automobile through adjusting the pressure of the hydraulic pump cylinder of the driving wheel and the driven wheel by the control system, and the working radius of the driving wheel and the driven wheel can be continuously adjusted, so that the stepless speed change is realized. The existing transmission is performed through the metal belt 23, when the driving wheel set 22 and the driven wheel set 24 are worn and meshed for a long time, the metal belt 23 is worn and loosened, so that the transmission efficiency is reduced, and the speed change efficiency of the vehicle during running cannot be well maintained, so that a device is needed to solve the problems. Disclosure of Invention The present invention is directed to a transmission device and a control method thereof, which solve the above-mentioned problems. The speed change device comprises a steering motor, a V-shaped belt, a ball gear nut, a stepless regulation belt tensioning device and a stepless regulation gear device, wherein the stepless regulation gear device is arranged at the output end position of the steering motor, the V-shaped belt is sleeved on the outer sides of the ball gear nut and a speed change inclined belt pulley, the stepless regulation belt tensioning device is pressed on the V-shaped belt, and the V-shaped belt is ensured to be in a tensioning state through the stepless regulation belt tensioning device. Preferably, the stepless regulation belt tensioning device comprises a regulation belt tightness fixed speed wheel, a displacement regulation gear mechanism and a gear movement regulation motor, the regulation belt tightness fixed speed wheel is clung to the outer side of the V-shaped belt, the displacement regulation gear mechanism is arranged on one side of the regulation belt tightness fixed speed wheel, the displacement regulation gear mechanism comprises a frame structure and a pinion, the regulation belt tightness fixed speed wheel is movably clamped on one side of the frame structure, the pinion is meshed on the inner side wall of the frame structure, the output end of the gear movement regulation motor is arranged on one side of the displacement regulation gear mechanism, the output end of the gear movement regulation motor is fixed at the center position of the pinion, and the gear movement regulation motor drives the pinion to rotate during use, so that the frame structure moves along the pinion, the displacement regulation gear mechanism drives the regulation belt tightness fixed speed wheel to move to squeeze the outer side of the V-shaped belt, the tension of the V-shaped belt is regulated, and the V-shaped belt can still be in a required tensioning state during long-time use through the movement stroke of the displacement regulation gear mechanism. Preferably, the stepless speed change adjusting gear device comprises a speed change adjusting motor, a speed change propeller, a bidirectional speed change ball screw, a speed change inclined belt pulley, a screw fixed rear end cover, a sealing ring, a gear housing, a screw power gear, a housing front end cover and a motor driving gear, wherein the speed change adjusting motor is fixed on one side of the housing front end cover, the gear housing is fixed between the gear housing and the housing front end cover, the motor driving gear is fixed at the output end position of the speed change adjusting motor, the screw power gear is movably embedded in the housing front end cover, the screw fixed rear end cover is embedded and fixed