CN116816882A - A two-speed lockable intelligent transfer case with active torque distribution - Google Patents

Abstract

This application provides a two-speed lockable intelligent transfer case with active torque distribution. The power is transmitted to the first output shaft through the planetary row on the input shaft through the shifting mechanism. The first output shaft is also provided with a lubricating oil pump, The locking mechanism, driving sprocket, clutch group, disc spring, pressure plate and clutch pressing mechanism are connected to the second output shaft in a chain drive manner. The shifting mechanism and locking mechanism are placed on the intermediate shaft and are connected to the camshaft. They are coordinated and driven by the mode motor to complete the selection of high and low gears of the transfer case and the switching of the mechanical locking state between the output shaft shafts; the clutch pressing mechanism The groove ramps in the motor have different slopes, so by controlling the number of rotations of the drive motor, the clutch can be pressed to different degrees actively, quickly and accurately; at the same time, the two motors can cooperate with each other, and the clutch pressing mechanism is first used to engage the clutch to eliminate locking. The rotation speed difference between the gear sleeves in the locking mechanism is determined, and then the locking mechanism is driven to achieve smooth locking between the transfer case output shafts.

Description

A two-speed lockable intelligent transfer case with active torque distribution

Technical field

The present application belongs to the technical field of vehicle transmission systems, and in particular relates to a two-speed lockable intelligent transfer case with active torque distribution.

Background technique

Off-road vehicles often need to drive on bad roads and roadless conditions, especially military vehicles, where the driving conditions are even worse, which requires an increase in the number of drive wheels. Therefore, off-road vehicles use multi-axle drive. In multi-axle driven cars, a transfer case is provided to distribute the output power to each drive axle. Transfer cases are generally equipped with high and low gears to further expand the transmission ratio and number of gears when driving in difficult areas. The function of the transfer case is to distribute the power output from the transmission to each drive axle and further increase the torque. The transfer case is also a gear transmission system. It is fixed on the frame alone. Its input shaft is connected to the output shaft of the transmission. There are several output shafts of the transfer case, which are connected to each drive axle through a universal transmission device. Most transfer cases have a larger load than the gearbox because they have to reduce speed and increase torque. Therefore, the constant gears in the transfer case are helical gears, and the bearings are also supported by tapered roller bearings.

In recent years, thanks to the rapid development of electronic control technology, off-road vehicle transfer cases have been transformed in an intelligent direction, using clutch slip to achieve timely distribution of torque between axles to ensure the safety and power of the vehicle during driving; in extreme off-road conditions, While increasing power input through gears, it is also necessary to consider the limitations of the clutch's own torque capacity and heat capacity. A mechanical locking mechanism that is rigidly connected between the axles can be added to improve vehicle passability. However, facing the complex and diverse driving conditions of vehicles, the existing transfer case cannot meet the active and precise distribution of torque between axles, nor can it realize multiple modes of transmission of input power.

Contents of the invention

1. Technical problems to be solved

In view of the complex and diverse driving conditions of vehicles, the existing transfer case cannot actively and accurately distribute torque between axles, nor can it realize the transmission of input power in multiple modes. This application provides a two-speed lockable torque converter. Actively distributed intelligent transfer case.

2 technical solutions

In order to achieve the above purpose, this application provides a two-speed lockable torque active distribution intelligent transfer case. The power is transmitted to the first output shaft through the gear planetary row on the input shaft and through the gear shifting mechanism. The first output shaft The output shaft is also equipped with a lubricating oil pump, a locking mechanism, a driving sprocket, a clutch group, a disc spring, a pressure plate and a clutch pressing mechanism in sequence, and is connected to the second output shaft in a chain drive manner; the shifting mechanism , the locking mechanism is sleeved on the intermediate shaft, and both are connected to the camshaft driven by the mode motor, coordinating the selection of high and low gears of the transfer case and the switching of the mechanical locking state between the output shaft shafts; the clutch The pressing mechanism is directly driven by the drive motor, and can actively realize different degrees of clutch pressing through the number of rotations; the mode motor and the drive motor can cooperate with each other to achieve smooth locking of the transfer case.

Another implementation provided by this application is: the gear planet row includes a sun gear, the sun gear is arranged on the input shaft, the sun gear meshes with the planet gear, and the planet gear meshes with the ring gear, so The ring gear is connected to the housing, the sun gear is provided with a first shift gear sleeve, the planet carrier is provided with a second shift gear sleeve, the first shift gear sleeve is connected to the shift mechanism Connected, the second shift gear sleeve is connected with the shift mechanism.

Another implementation provided by this application is: the shift mechanism includes a third shift gear sleeve, a shift fork plate, and a shift fork, and the third shift gear sleeve and the first shift gear are The gear sleeve is connected, the third shift gear sleeve is connected to the second gear shift sleeve, the shift fork plate is connected to the first output shaft, and the shift fork is arranged in the middle on axis.

Another implementation provided by this application is: the locking mechanism includes a locking fork, a locking fork plate and a first locking gear sleeve, and the first locking gear sleeve can selectively interact with the active The sprocket is connected, the locking fork is connected to the first output shaft, and the locking fork is arranged on the intermediate shaft.

Another implementation provided by this application is: the driving sprocket includes a second locking gear set, and the first locking gear set can be selectively connected to the second locking gear set; when starting the locking When the mode encounters a stuck condition, the drive motor can drive the clutch pressing mechanism to engage the clutch so that the first locking gear sleeve and the second locking gear sleeve are at the same speed, and cooperate smoothly with the mode motor. Complete the locking action.

Another implementation provided by this application is: the camshaft includes a mode cam, the mode cam is provided with a shift groove and a locking groove, and the shift groove is connected to the shift fork. , the locking groove is connected with the locking fork.

Another implementation provided by this application is: the shift groove and the locking groove have three different slopes along the circumferential expansion contour curve, and the rotation angle range of the corresponding mode motor for one rotation can be divided into A to B, B to C, C to A, so as to meet the axial movement stroke of the shift fork and locking fork in different modes of the two-speed lockable torque active distribution intelligent transfer case;

When the camshaft is driven by the mode motor to the first angle A, the two-speed lockable torque active distribution intelligent transfer case is in the high gear non-locking state; when the drive motor does not drive the clutch pressing mechanism, Realize two-speed lockable torque active distribution intelligent transfer case 2H mode operation, when the drive motor drives the clutch pressing mechanism according to the controller instructions to achieve different degrees of clutch engagement, realize two-speed lockable torque active distribution intelligent The transfer case operates in Auto mode;

When the camshaft is rotated by the mode motor to the second angle B, the shifting mechanism remains in the original position; the locking mechanism switches to the locking state, and the clutch pressing mechanism is not driven, achieving two-speed operation. Locked torque active distribution intelligent transfer case 4H Lock mode operation;

When the camshaft is rotated by the mode motor to the third angle C, the shifting mechanism adjusts the planetary row to be in a low gear, the locking mechanism does not act, and the clutch pressing mechanism is not driven, realizing two-speed The lockable torque active distribution intelligent transfer case operates in 4L Lock mode.

Another implementation provided by this application is: the clutch pressing mechanism includes a passive cam plate, an active cam plate and a worm connected in sequence, the active cam plate is connected to a helical gear, and the passive cam plate is provided in a groove. There is a ball, the worm is connected to the drive motor, and the number of rotations of the worm is directly controlled to control the displacement of the clutch pressing mechanism to actively realize different degrees of clutch pressing; the meshing parameters of the worm helical gear and the disc spring The stiffness parameter design can ensure that the clutch pressing mechanism automatically returns to the safe pressing position when the drive motor fails and the power is cut off.

Another implementation provided by this application is: a groove ramp is provided at the connection between the passive cam disk and the active cam disk, and the three groups of groove ramps are of equal arc length and have different slopes in the same section. .

Another implementation provided by this application is: the slope includes two sections of different expansion slopes, the initial section of the trench ramp is designed to have a large slope, the final section of the trench ramp is designed to have a small slope, and the transition between the two sections of different slopes is The radius is greater than the radius of the ball.

When the two-speed lockable torque active distribution intelligent transfer case provided by this application is switched to the locking state, the speed of the first locking gear sleeve on the transfer case locking fork plate in the high gear will Higher than the speed of the second locking gear sleeve on the sprocket. During the locking process, the two gear sleeves will be stuck and not meshed due to the inconsistent speed. At this time, the mode motor still drives the locking gear sleeve to move to the right. The drive motor can lightly press the clutch. , increasing the sprocket speed through the friction plate, and completing the locking function at the moment when the two gear sets are at the same speed.

3. Beneficial effects

Compared with the existing technology, the beneficial effects of the two-speed lockable torque active distribution intelligent transfer case provided by this application are:

The two-speed lockable torque active distribution intelligent transfer case provided by this application is a two-speed lockable torque active distribution intelligent transfer case.

The two-speed lockable torque active distribution intelligent transfer case provided by this application has two motors to realize the two-speed lockable torque active distribution intelligent transfer case. Multiple mode selections, the mode motor coordinates the control of the two-speed lockable Intelligent transfer case actively distributes torque to switch between high and low gears of input power and mechanically locks the output shaft; the drive motor drives the clutch pressing mechanism through a number of rotations to actively realize different degrees of pressing and relaxing of the clutch, transferring the power in a timely manner. Distributed to the front axle as needed; the cam plate groove ramp in the clutch pressing mechanism has two slopes, which not only responds quickly to control instructions but also improves clutch torque transmission control accuracy; in addition, with the mutual cooperation of the two motors, it can be smoothly Complete the locking action of the sprocket and the first output shaft to achieve a rigid connection between the front and rear axles of the vehicle.

The two-speed lockable torque active distribution intelligent transfer case provided by this application, the worm helical gear mechanism and the ball-ramp are connected in series to significantly amplify the drive motor torque and convert its rotational motion into pressure plate displacement, effectively avoiding the transmission of the pressing mechanism. Efficiency changes interfere with the clutch pressing force accuracy; at the same time, the groove ramp is designed with two sections with different slopes. The large slope in the initial section can accelerate the axial displacement of the clutch pressing mechanism in the idle stroke stage. When the pressure plate contacts the clutch, The reduced slope of the groove ramp can make the pressure plate displacement of the drive motor smaller at the same rotation angle, which not only improves the response speed of the clutch pressing mechanism but also enhances the clutch engagement control accuracy; and the driving motor is only connected in series with the pressing mechanism, which can reduce clutch pressing. During the degree adjustment process, the movement friction of other accessories will interfere with the torque output accuracy.

The two-speed lockable intelligent torque distribution intelligent transfer case provided by this application coordinates the switching of the planetary gear position and the output shaft locking state through a motor. Simple control can realize the two-speed lockable intelligent torque distribution actively. The transfer case operates in multiple modes to meet the complex driving conditions of the vehicle. At the same time, the integrated structure is conducive to the lightweight development of chassis parts; in addition, the two-speed lockable torque actively distributes the high and low gears and locking status of the intelligent transfer case. Mode selection is intermittent demand, which can reduce the selection requirements for the motor.

The two-speed lockable torque active distribution intelligent transfer case provided by this application is aimed at the stuck problem caused by the different rotation speeds of the locking gear sleeves during its switching to the locking mode. The mode motor cannot complete the gear sleeve engagement when driven alone. The clutch can be driven by the driving motor to drive the pressing mechanism to lightly press the clutch to increase the sprocket speed, and the locking action is completed at the moment when the gear sleeve is at the same speed.

Description of the drawings

Figure 1 is a schematic diagram of the principle of the two-speed lockable torque active distribution intelligent transfer case of this application;

Figure 2 is a schematic structural diagram of the two-speed lockable torque active distribution intelligent transfer case of this application;

Figure 3 is a schematic structural diagram of the shifting and locking actuator of this application;

Figure 4 is a schematic diagram of the camshaft groove profile expansion curve of the present application;

Figure 5 is a three-dimensional structural diagram of the clutch pressing mechanism of the present application;

Figure 6 is a schematic side view of the clutch pressing mechanism of the present application;

Figure 7 is a schematic diagram of the trench ramp structure of the present application.

Detailed ways

In the following, specific embodiments of the present application will be described in detail with reference to the accompanying drawings. According to these detailed descriptions, those skilled in the art can clearly understand the present application and be able to implement the present application. Without violating the principles of the present application, features in various embodiments may be combined to obtain new implementations, or certain features in certain embodiments may be replaced to obtain other preferred implementations.

Referring to Figures 1 to 7, this application provides a two-speed lockable intelligent transfer case with active torque distribution, including an input shaft 1 and a first output shaft 15 connected to each other. The shift mechanism 3 and the gear position The planetary row 2 is connected, the clutch pressing mechanism 13 is connected to the drive motor 14, the shifting mechanism 3 is connected to the intermediate shaft 5, the locking mechanism 4 is connected to the intermediate shaft 5, the shifting mechanism 3 Connected to the camshaft 6, the locking mechanism 4 is connected to the camshaft 6, the camshaft 6 is connected to the mode motor 7, the driving sprocket 9 is connected to the passive sprocket on the second output shaft through a chain, The locking mechanism 4 can be selectively connected to the driving sprocket 9 .

The power is transmitted to the first output shaft 15 through the upper gear planetary row of the input shaft 1 through the shift mechanism 3. The first output shaft 15 is also provided with a lubricating oil pump 8, a locking mechanism 4, a driving sprocket 9, and a clutch. Group 10, disc spring 11, pressure plate 12 and clutch pressing mechanism 13, and are connected to the second output shaft in a chain drive manner; the shifting mechanism 3 and the locking mechanism 4 are sleeved on the intermediate shaft 5 , and are connected to the camshaft 6 driven by the mode motor 7, to coordinate the selection of high and low gears of the transfer case and the switching of the mechanical locking state between the output shafts; the clutch pressing mechanism 13 is directly driven by the drive motor 14 , can actively achieve different degrees of clutch compression through the number of rotations; the mode motor 7 and the drive motor 14 can cooperate with each other to achieve smooth locking of the transfer case.

The mode motor 7 can rotate the camshaft 6 in coordination to complete the intermittent parallel movement of the shift mechanism 3 and the locking mechanism 4, respectively realizing two-speed lockable torque active distribution, intelligent transfer case high and low gear selection and the forward output shaft. The second output shaft 16 and the backward output shaft, that is, the first output shaft 15, switch between mechanical locking states; the drive motor 14 directly drives the clutch pressing mechanism 13 according to the number of rotations to actively realize different degrees of clutch pressing, so that the clutch pressing mechanism 13 It can actively and quickly and accurately complete the on-demand torque distribution between the shafts; at the same time, the two motors can cooperate with each other. When jamming occurs during the execution of the driving locking mechanism 4, the speed difference between the locking gear sleeves can be eliminated through clutch engagement to achieve dual Fast lockable torque active distribution intelligent transfer case smooth locking.

Equipped with two motors to realize two-speed lockable torque active distribution, the intelligent transfer case has multiple modes to choose from. Mode motor 7 coordinates the control of the two-speed lockable torque active distribution, the intelligent transfer case input power to switch between high and low gears and Mechanical locking between the output shafts; the drive motor 14 drives the clutch pressing mechanism 13 through a number of rotations to actively tighten and relax the clutch to varying degrees, and distribute the power to the front axle in a timely manner as needed; the cam in the clutch pressing mechanism 13 The grooved ramp has two slopes, which not only responds quickly to control instructions but also improves system control accuracy; in addition, with the mutual cooperation of the two motors, the locking work of the sprocket can be completed smoothly, achieving a rigid connection between the front and rear axles of the vehicle.

Further, the gear planetary row 2 includes a sun gear 201, which is disposed on the input shaft 1. The sun gear 201 meshes with the planet gear, and the planet gear meshes with the ring gear 202. The ring 202 is connected to the housing, the sun gear 201 is provided with a first shift gear sleeve 204, the planet carrier 203 is provided with a second shift gear sleeve 205, the first shift gear sleeve 204 is connected to the The shift mechanism 3 is connected, and the second shift gear sleeve 205 is connected to the shift mechanism 3 .

Specifically, the sun gear 201 of the gear planetary row 2 and the input shaft 1 transmit power through splines, and the ring gear 202 is fixedly connected to the housing. The shifting mechanism 3 is composed of a shift fork plate 301 and a shift fork 302. The sun gear 201 and the planet carrier 203 are respectively provided with a first shift gear sleeve 204 and a second shift gear sleeve 205, and the shift fork plate 301 is provided with a third shift gear sleeve 303, so The third shift gear sleeve 303 can be connected to the first shift gear sleeve 204 and the second shift gear sleeve 205 respectively.

Further, the shift mechanism 3 includes a third shift gear sleeve 303, a shift fork plate 301 and a shift fork 302 that are connected in sequence. The third shift gear sleeve 303 is connected to the first shift gear. The gear sleeve 204 is connected, the third shift gear sleeve 303 is connected to the second shift gear sleeve 205, the shift fork 301 is connected to the first output shaft 15, and the shift fork 302 is provided on the intermediate shaft 5 .

Further, the locking mechanism 4 includes a locking fork 402, a locking fork plate 401 and a first locking gear sleeve 403 connected in sequence. The first locking gear sleeve 403 can selectively interact with the active gear. The sprocket 9 is connected, the locking fork 401 is connected to the first output shaft 15 , and the locking fork 402 is arranged on the intermediate shaft 5 .

Specifically, the inner diameters of the shift fork 301 and the locking fork 401 are connected to the rearward output shaft 15 by sliding splines, and their outer edges are respectively nested in the shift fork 302 and the lock. The front end of the stop fork 402, the middle part of the shift fork 302 and the locking fork 402 is hollowly sleeved on the intermediate shaft 5 arranged parallel to the rearward output shaft 15, and the end corresponds to the part extending into the circumference of the mode cam 601 In the shift groove and the locking groove, the mode cam 601 is fixedly connected to the camshaft 6 and is parallel to the intermediate shaft 5 .

Further, the camshaft 6 includes a mode cam 601. The mode cam 601 is provided with a shift groove and a locking groove. The shift groove is connected to the shift fork end 302. The locking groove is connected to the locking fork 402 .

The mode motor 7 directly drives the camshaft 6 to complete the cooperative action of the shifting mechanism 3 and the locking mechanism 4. The rotation of the mode cam 601 can use the circumferential shifting groove and the locking groove to drive the shift fork 302 and the locking groove respectively. The locking fork 402 moves axially along the intermediate shaft 5 , thereby driving the shift fork 301 and the locking fork 401 to slide along the rear output shaft 15 . This achieves the selective engagement and disengagement of the two-speed lockable torque active distribution intelligent transfer case shift gear sleeve and the locking gear sleeve respectively.

The shift groove and the locking groove have three different slopes along the circumferential expansion contour curve. The angle range corresponding to one rotation of the mode motor 7 can be divided into A to B, B to C, and C to A, thereby satisfying the above requirements. The shift fork 302 and the locking fork 402 actively distribute the axial movement stroke required by the different modes of the intelligent transfer case in two-speed lockable torque;

When the camshaft 6 is driven by the mode motor 7 from the first rotation angle A to the second rotation angle B, the shift mechanism 3 remains in the original position, and the third shift gear sleeve 303 is still only in contact with the first rotation angle B. The shift gear sleeve 304 is engaged; the locking fork 402 drives the locking fork plate 401 to slide to the right along the rear output shaft 15, and the first locking gear sleeve 403 and the second locking gear The sleeve 901 changes from separated to engaged, and the rearward output shaft 15 is mechanically connected to the driving sprocket 9. The clutch pressing mechanism 13 is not driven, realizing two-speed lockable torque active distribution, intelligent transfer case 4H Lock mode. run;

When the camshaft 6 is driven by the mode motor 7 from the second rotation angle to the third rotation angle C, the shift fork 302 drives the shift fork plate 301 to slide to the right along the rear output shaft 15. The third shift gear sleeve 303 is separated from the first shift gear sleeve 204 and engaged with the second shift gear sleeve 205. The input power is amplified and output by the planet carrier 203, and the locking mechanism 4 does not operate. The first locking gear sleeve 403 is still engaged with the second locking gear sleeve 901, and the clutch pressing mechanism 13 is not driven, realizing a two-speed lockable torque active distribution intelligent transfer case 4L Lock mode operation;

When the camshaft 6 continues to rotate to the initial angle A by the mode motor 7, the camshaft 6 rotates once, and the shift fork 302 drives the shift fork plate 301 to slide leftward along the rear output shaft 15. The third shift gear sleeve 303 is separated from the second shift gear sleeve 205 and engaged with the first shift gear sleeve 204. The locking fork 402 drives the locking fork plate 401 along the The rear output shaft 15 slides to the left, the first locking gear sleeve 403 and the second locking gear sleeve 901 change from engagement to separation, and the two-speed lockable torque active distribution intelligent transfer case is in high gear. The position is not locked; when the drive motor 14 does not drive the clutch pressing mechanism 13, the clutch is not engaged, and there is no power transmission between the rear output shaft 15 and the driving sprocket 9, realizing two-speed lockable torque active distribution and intelligent splitting. The drive operates in 2H mode. When the drive motor 14 drives the clutch pressing mechanism 13 according to the controller instructions to achieve different degrees of clutch engagement, the driving sprocket 9 obtains part of the power from the rear output shaft 15 to achieve a two-speed lockable The intelligent transfer case with active torque distribution operates in Auto mode.

A motor coordinates the switching of gear planetary row 2 and the locked state of the output shaft. Simple control can realize two-speed lockable torque active distribution and intelligent transfer case multi-mode operation to meet the complex driving conditions of the vehicle. At the same time, integrated The structure is conducive to the lightweight development of chassis parts.

Further, the clutch pressing mechanism 13 includes a passive cam plate 1301, an active cam plate 1303 and a worm 1304 connected in sequence. The active cam plate 1303 is connected to a helical gear 1305, and the passive cam plate 1301 is connected to the active cam. A ball 1302 is provided in the groove where the plates meet. The worm 1304 is connected to the drive motor 14. The number of rotations of the worm 1304 is directly controlled to control the displacement of the clutch pressing mechanism to actively realize different degrees of clutch pressing. The meshing parameters of the worm 1304 helical gear 1305 and the stiffness parameters of the disc spring 11 are designed to ensure that the clutch pressing mechanism 13 automatically returns to the safe pressing position when the drive motor 14 fails and is powered off.

Further, groove ramps are provided on the opposite surfaces of the passive cam plate 1301 and the active cam plate 1303. The three groups of groove ramps have equal arc lengths and have different slopes in the same section.

Further, the slope includes two sections of different expansion slopes, the initial section of the groove ramp is designed to have a large slope, and the final section of the groove ramp is designed to have a small slope. The transition radius of the connection between the two sections of different slopes is greater than the radius of the ball.

The ball 1302 is located in the groove ramp on the opposite surface of the active cam plate 1303 and the passive cam plate 1301. The ball 1302 is concentrically sleeved on the rearward output shaft 15, and is clamped between the disc spring 11 and the shaft. The ring is axially compressed and pre-tightened and fixed to the right end of the clutch group 10; the raised portion of the outer edge of the passive cam plate 1301 extends into the housing slide rail to limit circumferential rotation and guide axial movement, and the active cam The incomplete circumference of the disc 1303 is embedded in a helical gear 1305, meshing with a worm 1304 supported by the housing.

There are three sets of groove ramps with equal arc length and variable slope depth at equal radii on the opposite sides of the active cam plate 1303 and the passive cam plate 1301, and are arranged in reverse directions along the circumference. Initially, the ball 1302 is in the groove. At the deepest part of the groove ramp, when the active cam plate 1303 and the passive cam plate 1301 undergo positive relative rotational displacement, the ball 1302 will roll along the groove ramp toward the shallowest part, prompting the passive cam plate 1301 to The cam plate 1301 pushes the pressure plate 12 to move closer to the clutch group 10 along the axial direction, thereby realizing clutch compression; when the active cam plate 1303 and the passive cam plate 1301 undergo reverse relative rotational displacement, the ball 1302 will By rolling toward the deepest part of the groove ramp, the passive cam plate 1303 moves axially away from the pressure plate 12 to actively reduce the clutch compression.

The variable-slope groove ramp has two sections with different expansion slopes. The initial section of the groove ramp is designed with a large slope, which can quickly overcome the idle stroke stage of the pressure plate 12 and the clutch group 10; the final section of the groove ramp is designed A small slope can reduce the rolling displacement of the ball 1302 under the same relative rotation angle of the cam plate, which can improve the axial displacement accuracy of the pressure plate 12; the transition radius of the connection between the two sections with different slopes is larger than the radius of the ball 1302 to ensure that the ball is stable scroll.

The worm helical gear mechanism in series with the ball-ramp significantly amplifies the torque of the drive motor and converts its rotational motion into the displacement of the pressure plate, effectively avoiding the interference of changes in the transmission efficiency of the pressing mechanism on the accuracy of the clutch pressing force; at the same time, the groove ramp design The two sections have different slopes. The large slope of the initial section can accelerate the axial displacement of the clutch pressing mechanism during the idle stroke stage. When the pressure plate contacts the clutch, reducing the slope of the groove ramp causes the pressure plate displacement to become smaller at the same rotation angle of the drive motor. It not only improves the response speed of the clutch pressing mechanism but also enhances the clutch engagement control accuracy.

Further, the driving sprocket 9 includes a second locking gear sleeve 901, and the first locking gear sleeve 403 can be selectively connected to the second locking gear sleeve 901 to achieve inter-shaft locking. When the locking function of the two-speed lockable torque active distribution intelligent transfer case is stuck, that is, the first locking gear sleeve 403 and the second locking gear sleeve 901 are not meshed due to the speed difference. On, the drive motor 14 can drive the clutch pressing mechanism 13 to engage the clutch so that the first locking gear sleeve 403 and the second locking gear sleeve 901 move at the same speed, thus completing the locking action smoothly.

Example

Figure 1 is a schematic diagram of the two-speed lockable torque active distribution intelligent transfer case of the present application. As shown in the figure, the sun gear 201 of the gear planetary row 2 is directly connected to the input shaft 1 through splines, and the ring gear 202 is formed by the shell. The sun gear 201 and the planet carrier 203 are respectively designed with the first shift gear sleeve 204 and the second shift gear sleeve 205 of the same size, which can be respectively engaged with the third shift gear sleeve 303 in the shift fork plate 301 so as to The input power is output in different transmission ratios, in which the inner diameter of the shift fork 303 is connected to the rearward output shaft 15 through a sliding internal spline, and the outer edge is nested in the front end of the shift fork 302 guided and supported by the intermediate shaft 5, and The end of the shift fork 302 extends into the circumferential shift groove track of the mode cam 601.

The driving sprocket 9 can complete the power transmission through the chain and the driven sprocket in the forward output shaft 16. It is sleeved on the rearward output shaft 15, and is designed with a second locking gear sleeve 901 that can be connected with the locking fork plate 401. The first locking gear sleeve 403 is selectively engaged. The inner diameter of the locking fork 401 is connected to the rearward output shaft 15 through a sliding internal spline. The outer edge is nested in the front end of the locking fork 402 guided and supported by the intermediate shaft 5. , the end of the locking fork 402 extends into the circumferential locking groove track of the mode cam 601. The mode cam 601 is fixedly connected to the camshaft 6 and is directly driven by the mode motor 7 .

The driven hub of the clutch group 10 is fixedly connected to the driving sprocket 9. The driving hub is driven by the backward output shaft 15. The disc spring 11, the pressure plate 12, the needle bearing, the passive cam plate 1301, the ball 1302, and the active cam plate 1303 are in sequence. It is arranged concentrically with the rear output shaft 15 and is fastened with a snap ring at the end through the shaft. The driving hub and the pressure plate 12 are connected through sliding splines. The raised part of the outer edge of the passive cam plate 1301 extends into the axial slide rail of the housing. , the incomplete circumference of the active cam plate 1303 is embedded in the helical gear 1305 and meshes with the worm 1304 supported by the housing. The ball 1302 is located at the variable depth groove ramp at the equal radius of the opposite surface of the active cam plate 1303 and the passive cam plate 1301. The worm 1304 extends The output end is directly driven by the drive motor 14.

The power from the input shaft can be transmitted to the rear output shaft 15 through the high and low gears of the gear planetary row 2. The driving sprocket 9 can transmit the power of the rear output shaft 15 to the rear output shaft 15 through the locking mechanism 4 or the clutch group 10 through the chain. The forward output shaft 16 can realize two-speed lockable torque active distribution and multi-mode operation of the intelligent transfer case according to driving needs.

Figure 2 is a structural diagram of the two-speed lockable torque active distribution intelligent transfer case of the present application. Figure 6 is a side view of the clutch pressing mechanism of the present application. As shown in the figure, the entire body includes an input shaft 1 and a gear planetary row 2 , shift mechanism 3, locking mechanism 4, intermediate shaft 5, camshaft 6, mode motor 7, lubricating oil pump 8, driving sprocket 9, clutch group 10, disc spring 11, pressure plate 12, clutch pressing mechanism 13 , drive motor 14, backward output shaft 15, forward output shaft 16.

The mode motor 7 can drive the camshaft 6 to rotate through three rotation angles, corresponding to the three stroke segments with different expansion slopes of the circumferential shift groove and the locking groove of the mode cam 301, combined with the guiding function of the intermediate shaft 5, to drive the shift paddle. The fork 302 and the locking fork 402 intermittently generate axial displacement as the camshaft 6 rotates, thereby prompting the shift fork plate 301 and the locking fork plate 401 to slide on the rear output shaft 15, respectively completing the gear shifting. The engagement and separation actions of the sleeve and the locking gear sleeve.

The driving motor 14 drives the worm 1304 to rotate through the helical gear 1305 to cause the active cam plate 1303 to rotate relative to the passive cam plate 1301. If it rotates in the forward direction, the ball 1302 will roll along the groove ramp from deep to shallow, pushing the passive cam plate 1301 Produces an axial displacement close to the clutch group 10, thereby pushing the pressure plate 12 through the needle bearing to compress the clutch, and actively transmits the power of the rear output shaft 15 to the forward output shaft 16 through the driving sprocket 9 as needed; if reverse rotation, or the drive motor 14 fails and is powered off, the ball 1302 will roll from shallow to deep along the groove ramp under the joint action of the disc spring 11, and the passive cam plate 1301 will produce an axial displacement away from the clutch group 10. Actively reduce the pressing degree of the clutch by the pressure plate 12 and reduce the power distribution to the forward output shaft 16.

When the mode motor 7 drives the camshaft 6 from the first position A to the second position B, the third shift gear sleeve 303 remains engaged with the first shift gear sleeve 204, and the input power is still directly output by the sun gear 201. The first locking gear sleeve 403 and the second locking gear sleeve 901 switch from separation to engagement, and the driving sprocket 9 is mechanically connected to the rearward output shaft 15 to realize two-speed lockable torque active distribution intelligent transfer case 4H Lock mode operation. Preferably, if the first locking gear sleeve 403 and the second locking gear sleeve 901 cannot be smoothly connected due to inconsistent rotational speeds, the drive motor 14 can drive the clutch pressing mechanism 13 to increase the rotational speed of the driving sprocket to promote the first locking gear. The sleeve 403 is at the same speed as the second locking gear sleeve 901, accelerating the completion of the two-speed lockable torque active distribution intelligent transfer case locking action.

When the mode motor 7 drives the camshaft 6 from the second position B to the third position C, the third shift gear sleeve 303 is separated from the first shift gear sleeve 204 but is switched to be engaged with the second shift gear sleeve 205 state, the input power is amplified and output by the planet carrier 203, the first locking gear sleeve 403 and the second locking gear sleeve 901 remain engaged, the driving sprocket 9 and the rearward output shaft 15 are still connected, achieving two-speed lockability The intelligent transfer case with active torque distribution operates in 4L Lock mode.

When the mode motor 7 drives the camshaft 6 from the third position C to the first position A, the mode cam 601 rotates once, and the third shift gear sleeve 303 in the shift mechanism 3 only engages with the first shift gear sleeve 204 , the input power is directly output by the sun gear 201, the first locking gear sleeve 403 in the locking mechanism 4 is separated from the second locking gear sleeve 901, the driving sprocket 9 is not fixedly connected to the rearward output shaft 15, and the two-speed can The locked torque is actively distributed and the intelligent transfer case is in a non-locked state in high gear. If the drive motor 14 does not drive the worm 1305 to rotate, the clutch pressing mechanism 13 does not act, and the clutch group does not engage, realizing the two-speed lockable torque active distribution intelligent transfer case 2H mode operation. If the drive motor 14 drives the worm 1305 to rotate, The active cam plate 1303 generates relative rotational displacement relative to the passive cam plate 1301, and the ball 1302 will roll along the groove ramp, prompting the pressure plate 12 to engage the clutch group 10 to varying degrees, realizing two-speed lockable torque active distribution and intelligent splitting. The driver operates in Auto mode.

Figure 3 is a three-dimensional structural view of the shift and lock execution system of the present application, including a shift fork 301, a locking fork 401, a shift fork 302, a locking fork 402, an intermediate shaft 5, a mode Cam 601, camshaft 6, mode motor 7. The contour expansion curves of the shift groove and the locking groove on the circumference of the mode cam 601 have three different expansion slopes, which respectively correspond to the three angle ranges of the camshaft 6, from the first angle A to the second angle B, and from the second angle B to The third corner C, the third corner C to the first corner A, as shown in Figure 4. When the camshaft 6 of the mode motor 7 rotates at a certain angle, the different slopes of the shift groove and the locking groove cooperate with each other to drive the shift fork 302 and the locking fork 402 to achieve two-speed lockable torque active distribution. Intelligent transfer case operates in multiple modes.

The mode motor 7 drives the camshaft 6 from the first angle A to the second angle B. The slope of the first segment of the shift groove profile expansion curve is zero, which does not drive the shift fork 302 to move. The locking groove profile expansion curve is the first segment. The segment slope is negative, driving the locking fork 402 to move to the right, realizing the two-speed lockable torque active distribution intelligent transfer case 4H Lock mode.

The mode motor 7 drives the camshaft 6 from the second angle B to the third angle C. The slope of the second segment of the shift groove profile expansion curve is negative, driving the shift fork 302 to move to the right, and the locking groove profile expansion curve of the second segment is negative. The slope of the second stage is zero, which does not cause the locking fork 402 to move, realizing the two-speed lockable torque active distribution intelligent transfer case 4L Lock mode.

The mode motor 7 drives the camshaft 6 from the third corner C to the first corner A. The slope of the third segment of the shift groove profile expansion curve is positive, driving the shift fork 302 to move to the left, and the locking groove profile expansion curve of the third segment is positive. The slope of the third section is positive, driving the locking fork 402 to move to the left, switching the two-speed lockable torque active distribution intelligent transfer case to the high gear non-locking state, and according to the drive motor 14 to the clutch pressing mechanism 13 Function conditions, realizing two-speed lockable torque active distribution intelligent transfer case 2H or Auto mode.

Figure 5 is a three-dimensional structural view of the clutch pressing execution system of the present application. It includes a passive ball cam plate 1301, a ball 1302, an active cam plate 1303, a worm 1304, and a driving motor 14.

The forward high transmission ratio characteristics of the worm helical gear mesh can initially amplify the torque of the drive motor 14, and further expand the drive torque through the ball-ramp rolling contact and convert it into clutch pressing force, reducing the power parameter requirements of the drive motor 14; at the same time , if there is no current input to the drive motor 14 in the clutch pressing state, combined with the compression stiffness of the disc spring 11 and the worm helical gear parameters, the clutch pressing mechanism 13 can be driven in the reverse direction to release the clutch pressing force to zero, satisfying the two-speed lockability The automatic torque distribution and intelligent transfer case failure prevent the vehicle from limping home in case of power outage.

This application controls the number of rotations of the drive motor 14 and converts it into the axial displacement of the pressure plate 12 through the clutch pressing mechanism 13, actively realizing different degrees of clutch pressing and relaxing, which can effectively avoid the impact of changes in the transmission efficiency of the clutch pressing mechanism 13. Interference with clutch pressure accuracy. In order to improve the response speed of the clutch pressing command and the control accuracy of torque transmission, the variable depth groove ramps in the active cam plate 1303 and the passive cam plate 1301 are designed with two different slopes. As shown in Figure 7, the 0 point is the groove slope. The deepest part of the groove is the rolling starting point of the ball 1302, point b is the shallowest part of the groove ramp, which is the rolling end point of the ball, and point a is the transition point of two different slopes in the groove ramp.

The drive motor 14 actively drives the worm 1304. When the ball 1302 rolls between point 0 and point a of the groove ramp, the groove ramp has a large slope. During the clutch engagement process, the idle stroke between the pressure plate 12 and the clutch can be accelerated. The phase is eliminated and the resistance of the disc spring 11 is overcome; when the ball 1302 rolls between point a and point b of the groove ramp, the pressure plate 12 is in contact with the clutch, and the slope of the groove ramp becomes smaller, and the same drive motor The rolling displacement of the ball 1302 can be reduced under the 14-turn angle, and the axial displacement accuracy of the pressure plate 12 can be improved.

Although the present application has been described above with reference to specific embodiments, those skilled in the art will understand that many modifications can be made to the configurations and details disclosed herein within the principles and scope of the disclosure. The protection scope of the present application is determined by the appended claims, and the claims are intended to cover all modifications included in the literal meaning or range of equivalents to the technical features in the claims.

Claims (10)

1. A two-speed lockable intelligent transfer case with active torque distribution, characterized in that: power is transmitted to the first output shaft through the gear planetary row on the input shaft through the shifting mechanism, and the first output shaft is also A lubricating oil pump, a locking mechanism, a driving sprocket, a clutch group, a disc spring, a pressure plate and a clutch pressing mechanism are arranged in sequence, and are connected to the second output shaft in a chain drive manner; the shifting mechanism, the lock The stop mechanism is sleeved on the intermediate shaft and is connected to the camshaft driven by the mode motor to coordinately complete the selection of high and low gears of the transfer case and the switching of the mechanical locking state between the output shaft shafts; the clutch pressing mechanism is composed of The drive motor is directly driven and can actively realize different degrees of clutch compression through the number of rotations; the mode motor and the drive motor can cooperate with each other to achieve smooth locking of the transfer case. 2. The two-speed lockable torque active distribution intelligent transfer case according to claim 1, characterized in that: the gear planetary row includes a sun gear, and the sun gear is arranged on the input shaft, so The sun gear meshes with the planet gear, the planet gear meshes with the ring gear, the ring gear is connected to the housing, the sun gear is provided with a first shift gear sleeve, and the planet carrier is provided with a second shift gear The first shift gear sleeve is connected to the shift mechanism, and the second shift gear sleeve is connected to the shift mechanism. 3. The two-speed lockable intelligent transfer case with active torque distribution as claimed in claim 2, wherein the shifting mechanism includes a third gear sleeve, a shift fork plate and a shift fork. , the third shift gear sleeve is connected to the first shift gear sleeve, the third shift gear sleeve is connected to the second shift gear sleeve, and the shift fork plate is connected to the third shift gear sleeve. An output shaft is connected, and the shift fork is arranged on the intermediate shaft. 4. The two-speed lockable intelligent transfer case with active torque distribution as claimed in claim 3, wherein the locking mechanism includes a locking fork, a locking fork plate and a first locking gear sleeve. , the first locking gear sleeve can be selectively connected to the driving sprocket, the locking fork plate is connected to the first output shaft, and the locking fork is arranged on the intermediate shaft. 5. The two-speed lockable intelligent transfer case with active torque distribution as claimed in claim 4, wherein the driving sprocket includes a second locking gear set, and the first locking gear set is selectable. Sexually connected with the second locking gear sleeve; when a stuck condition is encountered when starting the locking mode, the drive motor can drive the clutch pressing mechanism to engage the clutch so that the first locking gear sleeve and the The second locking gear sleeve has the same speed and cooperates with the mode motor to smoothly complete the locking action. 6. The two-speed lockable torque active distribution intelligent transfer case as claimed in claim 5, characterized in that: the camshaft includes a mode cam, and the mode cam is provided with a shift groove and a locking groove. groove, the shift groove is connected to the shift fork, and the locking groove is connected to the locking fork. 7. The two-speed lockable torque active distribution intelligent transfer case according to claim 6, characterized in that: the shift groove and the locking groove have three different slopes along the circumferential expansion contour curve, corresponding to The rotation angle range of the mode motor for one rotation can be divided into A to B, B to C, C to A, thereby meeting the requirements of the shift fork and locking fork in the two-speed lockable torque active distribution intelligent transfer case. The axial movement stroke required by the mode; When the camshaft is driven by the mode motor to the first angle A, the two-speed lockable torque active distribution intelligent transfer case is in the high gear non-locking state; when the drive motor does not drive the clutch pressing mechanism, Realize two-speed lockable torque active distribution intelligent transfer case 2H mode operation, when the drive motor drives the clutch pressing mechanism according to the controller instructions to achieve different degrees of clutch engagement, realize two-speed lockable torque active distribution intelligent The transfer case operates in Auto mode; When the camshaft is rotated by the mode motor to the second angle B, the shifting mechanism remains in the original position; the locking mechanism switches to the locking state, and the clutch pressing mechanism is not driven, achieving two-speed operation. Locked torque active distribution intelligent transfer case operates in 4HLock mode; When the camshaft is rotated by the mode motor to the third angle C, the shifting mechanism adjusts the planetary row to be in a low gear, the locking mechanism does not act, and the clutch pressing mechanism is not driven, realizing two-speed The lockable torque active distribution intelligent transfer case operates in 4LLock mode. 8. The two-speed lockable torque active distribution intelligent transfer case as claimed in claim 7, characterized in that: the clutch pressing mechanism includes a passive cam plate, an active cam plate and a worm connected in sequence, and the active The cam plate is connected to the helical gear. A ball is provided in the groove of the passive cam plate. The worm is connected to the drive motor. The number of rotations of the worm is directly controlled to control the displacement of the clutch pressing mechanism to actively realize the clutch. Different degrees of compression; the design of the worm helical gear meshing parameters and disc spring stiffness parameters can meet the requirement that the clutch compression mechanism automatically returns to the safe compression position when the drive motor fails and is powered off. 9. The two-speed lockable torque active distribution intelligent transfer case as claimed in claim 8, characterized in that: a groove ramp is provided at the connection between the passive cam plate and the active cam plate, and three groups of The trench ramps have equal arc lengths and the slopes of the ramps in the same section are different. 10. The two-speed lockable torque active distribution intelligent transfer case according to claim 9, characterized in that: the slope includes two different expansion slopes, the initial section of the groove ramp is designed with a large slope, and the final section is designed with a large slope. The groove ramp is designed with a small slope, and the transition radius of the connection between the two sections with different slopes is larger than the radius of the ball.