CN114658840A - Active speed regulation and gear shifting mechanism and method for automobile power system - Google Patents
Active speed regulation and gear shifting mechanism and method for automobile power system Download PDFInfo
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- CN114658840A CN114658840A CN202210303761.9A CN202210303761A CN114658840A CN 114658840 A CN114658840 A CN 114658840A CN 202210303761 A CN202210303761 A CN 202210303761A CN 114658840 A CN114658840 A CN 114658840A
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- 230000001360 synchronised effect Effects 0.000 description 7
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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
- F16H61/04—Smoothing ratio shift
- F16H61/0403—Synchronisation before shifting
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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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Abstract
The invention discloses an active speed regulation and gear shifting mechanism and method of an automobile power system. The driving speed regulating mechanism comprises a driving motor, a screw rod, a second gear shifting hub, a bearing, a belt wheel and a transmission belt, wherein the bearing is arranged in the center of one side of the belt wheel, and the other side of the belt wheel can be connected with and disconnected from the second gear shifting hub; the belt wheel and the combination teeth are in transmission through a transmission belt, and the screw rod can drive the second gear shifting hub to move back and forth. The actuating mechanism comprises a gear sleeve, a gear hub, a synchronizing ring and a combination tooth, wherein the gear hub is arranged on the inner side of the gear sleeve, and the synchronizing ring is positioned between the gear sleeve and the combination tooth. According to the invention, through an active speed regulation control strategy, the cost is reduced, the gear shifting smoothness of the synchronizer is improved, the influence of the gear shifting impact force on the synchronizer is reduced, and the reliability and the service life of the synchronizer are ensured.
Description
Technical Field
The invention belongs to the technical field of gear shifting control of an automobile power system, and particularly relates to an active speed regulation synchronous gear shifting system and a gear shifting method in a clutch-free gear shifting process of an automobile.
Background
In the hybrid electric vehicle adopting the clutch for shifting gears, the clutch enables the engine to be separated and the motor is adopted to drive the vehicle in a low-speed state; in a high speed state, the clutch couples the engine to the motor, and the engine matches the vehicle speed by virtue of the friction of the clutch, thus completing the gear shifting. The process not only increases the gear shifting time, so that the power interruption time is long; and the hydraulic control system of the clutch has the reliability problems of sealing and the like, and the cost is relatively high.
The synchronizer structure is an indispensable important ring in the field of transmissions of fuel automobiles, hybrid electric vehicles and pure electric vehicles at present, bears the tasks of power input and power output, realizes smooth switching of different gears and different driving modes of the automobiles, directly influences driving experience by the smoothness of gear shifting and the quality of gear shifting time, and even can generate irreversible influence on the reliability and the service life of the transmissions. Although the synchronizer is simple and convenient to shift and low in cost, the internal impact force of the synchronizer is large, the adjustment is difficult, and the reliability of the synchronizer and the reliability of a gearbox are seriously influenced.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a novel clutch-free synchronous gear shifting technology for an automobile power system, which completely uses a synchronous ring structure to complete the power coupling and gear shifting process. On one hand, the cost of the gearbox is greatly reduced, the space is reduced, the carrying performance is enhanced, and the manufacturing process is simplified; on the other hand, a set of efficient and reliable transmission scheme is provided for the synchronizer system, and the dynamic property, the economical efficiency and the comfort of the automobile are improved.
An active speed regulation gear shifting mechanism of an automotive power system, comprising:
a controller collecting vehicle and road information, pre-judging driver's intention to shift, judging shift demand, and adjusting motor speed or torque,
the actuating mechanism comprises a driving motor, a lead screw, a first gear shifting hub, a nut seat and a shifting fork, wherein the driving motor provides rotating speed or torque for the lead screw, the first gear shifting hub is detachably mounted in the nut seat, and the first gear shifting hub is provided with a spiral groove matched with the lead screw; the first gear shifting hub moves back and forth under the rotation of the screw rod, and the nut seat drives the shifting fork to move; the shifting fork is fork-shaped, the upper part of the shifting fork is connected with the nut seat, and the lower fork part of the shifting fork is movably connected with the tooth sleeve;
the driving speed regulating mechanism comprises a driving motor, a screw rod, a second gear shifting hub, a bearing and a belt wheel, wherein the bearing is arranged in the center of one side of the belt wheel, and the other side of the belt wheel can be connected with and disconnected from the second gear shifting hub; the screw rod can drive the second gear shifting hub to move back and forth, the belt wheel and the combining teeth are driven by components,
working strokes and idle strokes are arranged in the first gear shifting hub and the second gear shifting hub.
The actuating mechanism comprises a gear sleeve, a gear hub, a synchronizing ring and a combination tooth, wherein the gear hub is arranged on the inner side of the gear sleeve, and the synchronizing ring is positioned between the gear sleeve and the combination tooth.
Furthermore, the screw rod comprises two independent sections, the first section is connected with the first gear shifting hub, the second section is connected with the second gear shifting hub, and a speed reduction protector is arranged between the two sections.
Furthermore, the device also comprises a guide rod, wherein the guide rod is fixed, the guide rod is inserted into the shifting fork, and the shifting fork can horizontally move back and forth along the guide rod.
Further, a clamping groove is formed in the side face of the outer ring of the gear sleeve, an arc protrusion is arranged on the inner side of a fork portion of the shifting fork, and the arc protrusion is embedded into the clamping groove.
Further, the nut seat is in interference fit with the first shift hub.
Further, the second hub of shifting is provided with outer spline structure, the band pulley is provided with interior spline structure, the second hub of shifting and band pulley inside cooperation.
Correspondingly, the invention provides a clutchless synchronous gear shifting method for an automobile power system, which comprises the following steps of:
s1, acquiring a gear shifting requirement,
the controller collects the current speed, the vehicle state, the road condition, the traffic rule, the external environment and the engine speed of the engine, judges whether the current driving gear is suitable and not suitable, and sends the gear-up or gear-down requirement;
s2, pre-synchronizing gear shifting is carried out,
the executing mechanism acts, the controller motor outputs torque, the driving motor drives the screw rod to rotate, the first gear shifting hub is in a working stroke at the moment, the second gear shifting hub is in an idle stroke, and the first gear shifting hub drives the nut seat, the shifting fork and the gear sleeve to move transversely; the second gear shifting hub does not work for idle stroke, when the gear sleeve moves for a certain distance and is combined with the synchronous ring, the synchronizer enters a pre-synchronization stage,
s3, actively regulating the speed,
under the friction action of the synchronizing ring, the rotating speed of the combined gear slowly approaches the rotating speed of the gear hub, the driving motor continues to give torque to drive the screw rod to continue rotating, the first gear shifting hub is in an idle stroke, the second gear shifting hub is in a working stroke, the second gear shifting hub is successfully combined with the inner spline of the inner diameter of the belt wheel under the propelling action of the screw rod, the second gear shifting hub is connected with the belt wheel to work, so that the torque output by the motor is smoothly transmitted to the belt wheel, the speed of the combined gear is regulated, the rotating speed of the combined gear is rapidly changed under the action of the torque output by the motor until the rotating speed of the combined gear approaches the rotating speed of the gear hub,
s4, finishing the gear shifting,
the motor continues to output torque, the driving motor drives the screw rod to rotate, the first gear shifting hub is in a working stroke, the second gear shifting hub is connected with the belt wheel, the first gear shifting hub pushes the nut seat to continue moving under the action of the screw rod until the gear sleeve is combined with the combination teeth, and meanwhile the second gear shifting hub quits the belt wheel under the action of the screw rod and the protection unit.
The invention has the beneficial effects that:
according to the active speed regulation and gear shifting mechanism and method for the automobile power system, a clutch is not adopted during gear shifting, so that the cost is reduced, and meanwhile, the power interruption time is reduced; through the active speed regulation control strategy, the cost is reduced, meanwhile, the gear shifting smoothness of the synchronizer is improved, the influence of the gear shifting impact force on the synchronizer is reduced, and the reliability and the service life of the synchronizer are ensured.
Drawings
FIG. 1 is a schematic front view of an active speed adjustment and shift mechanism of an automotive power system according to the present invention;
FIG. 2 is a schematic perspective view of an active speed control shifting mechanism of an automotive power system according to the present invention;
FIG. 3 is an exploded view of the assembly of the gear hub, gear sleeve, synchronizing ring and coupling teeth of the present invention;
fig. 4 is an internal structural schematic diagram of the first shift hub and the second shift hub;
FIG. 5 is a simulation schematic of the combination of tooth speed, hub speed and sleeve displacement without an active speed regulation module during synchronizer ring shifting;
FIG. 6 is a simulation diagram of the active speed control module combined with the tooth speed, the hub speed and the sleeve displacement during the shift of the synchronizer ring.
In the figure: 1. a controller; 2. a drive motor; 3. a lead screw; 4. a nut seat; 5. a first shift hub; 6. a deceleration protector; 7. a second shift hub; 8. a pulley; 9. a bearing; 10. a transmission belt; 11. a shifting fork; 12. a guide bar; 13. a gear hub; 14. a gear sleeve; 15. a synchronizer ring; 16. a combination tooth 17 and a working stroke; 18. and (4) idle stroke.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
As shown in figures 1 and 2, an active speed-regulating gear-shifting mechanism of an automobile power system comprises a controller 1, an actuating mechanism, an active speed-regulating mechanism and an actuating mechanism,
the controller 1 collects vehicle and road information, pre-judges a driver's gear-shifting intention, judges a gear-shifting demand, and adjusts a motor rotation speed or torque.
Actuating mechanism includes driving motor 2, lead screw 3, first hub 5, nut seat 4, shift fork 11 of shifting, driving motor 2 provides rotational speed or moment of torsion for lead screw 3, and nut seat 4 inside detachably installs first hub 5 of shifting, first hub 5 of shifting is provided with the cooperation of heliciform slot and lead screw 3. The first gear shifting hub 5 moves back and forth under the rotation of the screw rod 3, and the nut seat 4 drives the shifting fork 11 to move; the shifting fork is fork-shaped, the upper part of the shifting fork is connected with the nut seat 4, and the lower fork part of the shifting fork is movably connected with a gear sleeve 14;
the driving speed regulating mechanism comprises a driving motor 2, a screw rod 3, a second gear shifting hub 7, a bearing 9, a belt wheel 8 and a transmission belt 10, wherein the bearing 9 is installed at the center of one side of the belt wheel 8, the other side of the belt wheel 8 and the second gear shifting hub 7 can be connected and disconnected, and the screw rod 3 can drive the second gear shifting hub 7 to move back and forth. The belt wheel 8 and the combination teeth 16 can be driven by a transmission belt 10, and grooves are respectively arranged on the belt wheel 8 and the combination teeth 16; the belt wheel 8 and the combination tooth 16 can be driven by a chain, and the belt wheel 8 and the combination tooth 16 are chain wheels; the belt wheel 8 and the connecting teeth 16 can also be directly meshed by adopting a gear.
The first shift hub 5 and the second shift hub 7 are provided with an operating stroke 17 and an idle stroke 18.
As shown in fig. 2 and 3, the actuating mechanism includes a gear sleeve 14, a gear hub 13, a synchronizing ring 15, and engaging teeth 16, the gear hub 13 is mounted inside the gear sleeve 14, and the synchronizing ring 15 is located between the gear sleeve 14 and the engaging teeth 16.
In one example, the threaded spindle 3 comprises two separate segments, a first segment connected to a first shift hub 5 and a second segment connected to a second shift hub 7, with a reduction protector 6 mounted between the two segments.
In one example, the device further comprises a guide rod 12, the guide rod 12 is fixed, the guide rod 12 is inserted into the shifting fork 11, and the shifting fork can horizontally move back and forth along the guide rod 12.
In one example, a clamping groove is formed in the side face of the outer ring of the gear sleeve 14, and an arc-shaped protrusion is arranged on the inner side of the fork part of the shifting fork 11 and embedded into the clamping groove.
In one example, the nut carrier 4 is an interference fit with the first shift hub 5.
In one example, the second shift hub 7 is provided with an external spline structure, the pulley 8 is provided with an internal spline structure, and the second shift hub 7 is internally fitted with the pulley 8.
Correspondingly, the invention provides a clutchless synchronous gear shifting method for an automobile power system, which comprises the following steps of:
s1, acquiring a gear shifting requirement,
the controller 1 collects the current speed, the vehicle state, the road condition, the traffic rule, the external environment and the engine speed of the engine, judges whether the current driving gear is suitable and not suitable, and sends the gear-up or gear-down requirement;
s2, pre-synchronizing gear shifting,
the actuating mechanism acts, the motor of the controller 1 outputs torque, the driving motor 2 drives the screw rod 3 to rotate, at the moment, the first gear shifting hub 5 is in a working stroke 17, the second gear shifting hub 7 is in an idle stroke 18, and the first gear shifting hub 5 drives the nut seat 4, the shifting fork 11 and the gear sleeve 14 to move transversely; the second shifting hub 7 is not operated for the idle stroke 18, and when the sleeve gear 14 moves a certain distance and is combined with the synchronizing ring 15, the synchronizer enters a pre-synchronization stage,
s3, actively regulating the speed,
under the friction action of the synchronizing ring 15, the rotating speed of the combined gear 16 slowly approaches the rotating speed of the gear hub 13, the driving motor 2 continues to give torque to drive the screw rod 3 to continue rotating, at the moment, the first gear shifting hub 5 is in an idle stroke 18, the second gear shifting hub 7 is in a working stroke 17, the second gear shifting hub 7 is successfully combined with an inner spline of the inner diameter of the belt wheel 8 under the propelling action of the screw rod 3, the second gear shifting hub 7 is connected with the belt wheel 8 to work, so that the torque output by the motor is smoothly transmitted to the belt wheel 8, the speed of the combined gear 16 is regulated, the rotating speed of the combined gear 16 is rapidly changed under the action of the torque output by the motor until the rotating speed of the gear hub 13 is close,
s4, finishing the gear shifting,
the motor continues to output torque, the driving motor 2 drives the screw rod 3 to rotate, at the moment, the first gear shifting hub 5 is in a working stroke 17, the second gear shifting hub 7 is connected with the belt wheel 8, the first gear shifting hub 5 pushes the nut seat 4 to continue moving under the action of the screw rod 3 until the gear sleeve 14 is combined with the combining teeth 16, and meanwhile, the second gear shifting hub 7 is withdrawn from the belt wheel 8 under the action of the screw rod 3 and the protection unit.
The working principle of the invention is as follows:
the controller 1 has the main functions of: judging whether a gear shifting demand exists according to external information (such as current vehicle speed, vehicle state, road condition, traffic rules, external environment, engine speed and the like), and controlling a motor to provide proper rotating speed or torque according to the gear shifting process of a synchronizer; the driving motor 2 provides power for horizontal translation for a gear sleeve 14 of the synchronizer under the stroke of a guide rod 12 through a lead screw 3, a first gear shifting hub 5, a nut seat 4 and a shifting fork 11 on one hand, and adjusts the rotating speed for a combined gear 16 through an active speed adjusting module comprising the lead screw 3, a speed reducing protector 6, a second gear shifting hub 7, a belt wheel 8 and a transmission belt 10 on the other hand, and the driving motor 2 can control the speed or the torque.
The internal structures of the first gear shifting hub 5 and the second gear shifting hub 7 are shown in fig. 4, working strokes 17 and idle strokes 18 exist in the first gear shifting hub 5 and the second gear shifting hub 7, and the working strokes 17 and the idle strokes 18 of the first gear shifting hub 5 and the second gear shifting hub 7 need to be matched and exchanged during the gear shifting process, so that power split can be realized without interruption of motor power. The periphery of the second gear shifting hub 7 is provided with an external spline structure which can be combined with an internal spline of the belt wheel 8, the first gear shifting hub 5 is provided with a spline structure and is mainly in interference fit with the nut seat 4, the inner diameter of the belt wheel 8 is provided with a spline structure which can be matched with the second gear shifting hub 7, and the inner diameter of the belt wheel 8 is also provided with a bearing 9 in an interference fit mode. When the belt wheel 8 is not combined with the second gear shifting hub 7, the belt wheel 8 rotates through the bearing 9 under the action of the combining teeth 16 and the transmission belt 10, and when the belt wheel 8 is combined with the second gear shifting hub 7, the torque is transmitted from the end of the driving motor 2 to the combining teeth 16 through the screw rod 3, the speed reduction protector 6, the second gear shifting hub 7, the belt wheel 8 and the transmission belt 10.
When the second gear shifting hub 7 is in a working stroke and is connected with the belt pulley 8, the combined teeth 16 can generate instantaneous torque to the screw rod 3 and the driving motor 2, so that the speed reduction protector 6 is arranged on the screw rod 3, has a main structure of a speed change structure or other structures, and has the function of avoiding damage to the screw rod 3 and the driving motor 2 caused by instantaneous impact of the belt pulley 8.
As shown in fig. 5, without an active speed regulation module for the coupling teeth 16: it can be seen from the figure that the speed curve of the coupling teeth 16 only drops slowly under the friction of the synchronizing ring 15 and the coupling teeth 16, the presynchronization time is longer, and the shift time is longer.
As shown in fig. 6, if the active speed regulation module for the engaging teeth 16 is added: it can be seen from the figure that the rotating speed curve of the combined teeth 16 is rapidly reduced under the double actions of the torque of the motor and the friction of the synchronous ring 15 and the combined teeth 16, the presynchronization time is rapidly shortened, the gear shifting time is obviously faster, the gear shifting process is more compact, and the effective control of the impact force can be realized.
Similarly, when the input rotation speed is greater than the output rotation speed, the difference between the active speed regulation modules is similar to the previous embodiment.
In conclusion, the active speed regulating module is added when the synchronizer shifts gears, so that the gear shifting time is shortened, and the controllability of impact force is realized.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the foregoing embodiments are merely illustrative of the technical spirit and features of the present invention, and the present invention is not limited thereto but may be implemented by those skilled in the art.
Claims (8)
1. The utility model provides an automobile power system initiative speed governing gearshift which characterized in that: the method comprises the following steps:
a controller (1), the controller (1) collects vehicle and road information, pre-judges driver's intention to shift gears, judges gear shift demand and adjusts motor speed or torque,
the actuating mechanism comprises a driving motor (2), a lead screw (3), a first gear shifting hub (5), a nut seat (4) and a shifting fork (11), wherein the driving motor (2) provides rotating speed or torque for the lead screw (3), the first gear shifting hub (5) is detachably mounted in the nut seat (4), and the first gear shifting hub (5) is provided with a spiral groove matched with the lead screw (3); the first gear shifting hub (5) moves back and forth under the rotation of the screw rod (3), and the nut seat (4) drives the shifting fork (11) to move; the shifting fork is fork-shaped, the upper part of the shifting fork is connected with the nut seat (4), and the lower fork part is movably connected with a gear sleeve (14);
the driving speed regulating mechanism comprises a driving motor (2), a screw rod (3), a second gear shifting hub (7), a bearing (9) and a belt wheel (8), wherein the bearing (9) is installed in the center of one side of the belt wheel (8), the other side of the belt wheel (8) can be connected with and disconnected from the second gear shifting hub (7), and the screw rod (3) can drive the second gear shifting hub (7) to move back and forth; a transmission structure is arranged between the belt wheel (8) and the combination teeth (16),
working strokes (17) and idle strokes (18) are arranged in the first gear shifting hub (5) and the second gear shifting hub (7);
the actuating mechanism comprises a gear sleeve (14), a gear hub (13), a synchronizing ring (15) and a combination tooth (16), wherein the gear hub (13) is installed on the inner side of the gear sleeve (14), and the synchronizing ring (15) is located between the gear sleeve (14) and the combination tooth (16).
2. The active speed regulation gear shifting mechanism of the automobile power system according to claim 1, characterized in that: the lead screw (3) comprises two independent sections, wherein the first section is connected with the first gear shifting hub (5), the second section is connected with the second gear shifting hub (7), and a speed reduction protector (6) is arranged between the two sections.
3. The active speed regulation gear shifting mechanism of the automobile power system according to claim 1, characterized in that: the belt wheel (8) and the combined teeth (16) are in transmission through one of the following structures: a transmission belt (10), a chain and a gear.
4. The active speed regulation gear shifting mechanism of the automobile power system according to claim 1, characterized in that: the automatic transmission device is characterized by further comprising a guide rod (12), wherein the guide rod (12) is fixed, the guide rod (12) is inserted into the shifting fork (11), and the shifting fork can horizontally move back and forth along the guide rod (12).
5. The active speed regulation gear shifting mechanism of the automobile power system according to claim 1, characterized in that: the gear sleeve (14) is characterized in that a clamping groove is formed in the side face of the outer ring of the gear sleeve, an arc protrusion is arranged on the inner side of a fork part of the shifting fork (11), and the arc protrusion is embedded into the clamping groove.
6. The active speed regulation gear shifting mechanism of the automobile power system according to claim 1, characterized in that: the nut seat (4) is in interference fit with the first gear shifting hub (5).
7. The active speed regulation gear shifting mechanism of the automobile power system according to claim 1, characterized in that: the second gear shifting hub (7) is provided with an external spline structure, the belt wheel (8) is provided with an internal spline structure, and the second gear shifting hub (7) is matched with the inside of the belt wheel (8).
8. An active speed regulation and gear shifting method of an automobile power system is characterized in that: the method comprises the following steps:
s1, acquiring a gear shifting requirement,
the controller (1) collects the current speed, the vehicle state, the road condition, the traffic rule, the external environment and the engine speed of the engine, judges whether the current driving gear is suitable and not suitable, and sends the gear-up or gear-down requirement;
s2, pre-synchronizing gear shifting is carried out,
the actuating mechanism acts, the motor of the controller (1) outputs torque, the driving motor (2) drives the screw rod (3) to rotate, at the moment, the first gear shifting hub (5) is in a working stroke (17), the second gear shifting hub (7) is in an idle stroke (18), and the first gear shifting hub (5) drives the nut seat (4), the shifting fork (11) and the gear sleeve (14) to move transversely; the second shifting hub (7) does not work for the idle stroke (18), when the gear sleeve (14) moves a certain distance and is combined with the synchronizing ring (15), the synchronizer enters a pre-synchronizing stage,
s3, actively regulating the speed,
under the friction action of the synchronizing ring (15), the rotating speed of the combined teeth (16) slowly approaches the rotating speed of the gear hub (13), at the moment, the driving motor (2) continues to give torque to drive the screw rod (3) to continue rotating, at the moment, the first gear shifting hub (5) is in an idle stroke (18), the second gear shifting hub (7) is in a working stroke (17), the second gear shifting hub (7) is successfully combined with an inner spline of the inner diameter of the belt wheel (8) under the propelling action of the screw rod (3), the second gear shifting hub (7) is connected with the belt wheel (8) to work, so that the torque output by the motor is smoothly transmitted to the belt wheel (8), the speed of the combined teeth (16) is regulated, the rotating speed of the combined teeth (16) is rapidly changed under the action of the torque output by the motor until the rotating speed of the combined teeth (16) approaches the rotating speed of the gear hub (13),
s4, finishing the gear shifting,
the motor continues to output torque, the driving motor (2) drives the screw rod (3) to rotate, at the moment, the first gear shifting hub (5) is in a working stroke (17), the second gear shifting hub (7) is in the working stroke (17), the second gear shifting hub (7) is connected with the belt wheel (8), the first gear shifting hub (5) pushes the nut seat (4) to continue to move under the action of the screw rod (3) until the gear sleeve (14) is combined with the combining teeth (16), and meanwhile the second gear shifting hub (7) is withdrawn from the belt wheel (8) under the action of the screw rod (3) and the protection unit.
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| DE102006054902A1 (en) * | 2005-12-15 | 2007-06-28 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Gear actuator for a motor vehicle's gearing device has an electric motor, a rotating threaded spindle driven by this motor, a spindle nut driven by the threaded spindle and a gear selector shaft |
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| CN103206529A (en) * | 2013-04-07 | 2013-07-17 | 无锡金田元丰科技股份有限公司 | Linear movement buffering type speed change control mechanism and automatic speed change device |
| CN103557316A (en) * | 2013-11-23 | 2014-02-05 | 合肥工业大学 | Screw-nut gear-shifting mechanism for automatic two-gear transmission of electric car |
| CN104329455A (en) * | 2014-11-11 | 2015-02-04 | 合肥工业大学 | Motor-driven planetary gear train gear shifting mechanism |
| CN112557028A (en) * | 2020-12-09 | 2021-03-26 | 江苏新能源汽车研究院有限公司 | Clutchless hybrid-driven gear shifting test bench and test method |
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