CN102751845B - Transmission system of rotary-type heat exchanger - Google Patents
Transmission system of rotary-type heat exchanger Download PDFInfo
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- CN102751845B CN102751845B CN201210236954.3A CN201210236954A CN102751845B CN 102751845 B CN102751845 B CN 102751845B CN 201210236954 A CN201210236954 A CN 201210236954A CN 102751845 B CN102751845 B CN 102751845B
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Abstract
The invention discloses a transmission system of a rotary-type heat exchanger, wherein the transmission system of the rotary-type heat exchanger comprises a third speed reducer. The transmission system of the rotary-type heat exchanger is characterized in that one end of the third speed reducer is connected with one end of a first magnetic force coupling device, and the other end of the first magnetic force coupling device is connected with a rotary end of a second main motor; the other end of the second main motor is connected with a control box; the other end of the third speed reducer is connected with one end of the second magnetic force coupling device; the other end of the second magnetic force coupling device is connected with a rotary end of a second auxiliary motor; the other end of the secondary auxiliary motor is connected with the control box; and the control box is connected with a rotor speed measuring system and a power supply. The transmission system of the rotary-type heat exchanger provided by the invention has the characteristics of high reliability, simplified running and maintaining operation, and the like.
Description
Technical field
The present invention relates to a kind of drive system of rotary type heat exchanger, belong to rotary type heat exchanger equipment technical field.
Background technology
Rotary type heat exchanger is the core component of this equipment.Its Main Function is that absorption boiler leading portion is discharged used heat, comes heating boiler burning and coal dust to carry air, or heats the cooled flue gas of desulphurization system again.Huge revolving formula heat exchanger comprises air preheater and flue gas-flue gas heat-exchange unit, and its rotor weight of filling heat-transfer surface can reach hundreds of tons, adopts the drive system of particular design to guarantee that it rotates continuously.Because can the rotation of air preheater normally move concerning steam generator system, the reliability of its work is extremely important to boiler unit.
The following two kinds of modes of the general employing of rotary type heat exchanger of traditional design complete the continuous rotation of rotor:
(1) pin ra ck drive mode: (referring to Fig. 1)
The rotor 1 of rotary type heat exchanger is connected with upper bearing 3 and lower bearing 4 by rotating shaft 2, and upper bearing 3 is arranged on top beam 5, and lower bearing 4 is arranged in lower beam 6.Top beam 5 is connected with lower beam 6 by the supporting seat 13 at its two ends, forms bearing frame, and the weight of heat exchanger and performance load are delivered on outside framework.Periphery at rotor 1 is equipped with transmission shroud 10, and its bearing pin 12 of being arranged by upper and lower steel loop 11 and equal pitch forms.On outer cover of heat exchanger, be connected with reductor bracket 8, top is used for laying the first reductor 7, the first reductor 7 below connection for transmission gears 9, and travelling gear 9 and transmission shroud 10 mesh, and realize the object of drive rotor.
(2) centre-driven mode: (referring to Fig. 2)
Different with pin ra ck drive mode, centre-driven mode rotor periphery is not established shroud, and the second reductor 16 is arranged on top beam 5 tops, the extension, top 14 of the second reductor 16 direct drive shafts 2; Or the second reductor 16 is arranged on lower beam 6 belows, the extension, bottom 15 of drive shaft 2.
Shroud drive system is as shown in Figure 3: the first reductor 7 arranges two to three inputs conventionally, to guarantee system safety operation.Main driving is comprised of the first main motor 21 and fluid coupling 22, and fluid coupling 22 is used to provide starting protection, alleviates the impact of starting torque on the first main motor 21; Secondary driving is comprised of the first auxiliary-motor 25 and freewheel clutch 23, when requiring auxiliary driving tachometer value lower, adds auxiliary reductor 24.The common power of major-minor motor is different; when user requires major-minor motor to adopt equal-wattage motor, also can adopt installing frequency converter, (Fig. 1 does not represent frequency converter with the object of adjusting rotor speed by variable frequency control, to realize starting protection; while adopting variable frequency control, can not establish fluid coupling)
Centre-driven drive system is as shown in Figure 4: the second reductor 16 arranges 2-3 input conventionally; the first main motor 21 is identical with the first auxiliary-motor 25 power; adopt frequency-variable controller 28 to make starting protection and adjusting rotary speed; when main gear reducer speed reducing ratio is inadequate, add the auxiliary reductor 26 of main transmission and the auxiliary reductor 27 of auxiliary driving.
Said system existing problems are:
(1) to pin ra ck drive mode, while adopting fluid coupling 22, its installation requirement is high, and both sides axiality requires to be less than 0.1mm, and inside is working media with oil, in overload or refuel and easily do not occur at that time that interior oil is overflowed and cause transmission failed, forces boiler shutdown.
(2), to pin ra ck drive mode, when major-minor power of motor is different, while being switched to the first auxiliary-motor 25 work, if the power of the first auxiliary-motor 25 is less than the first main motor 21 power, can not guarantee that the long-term band of unit operates at full capacity.
(3), to pin ra ck drive mode, during the first auxiliary-motor 25 work, the first main motor 21 meeting transfers, had both shortened its life-span, also cannot realize the object of the main motor 21 of online replacing first.
(4) to center type of drive, although major-minor power of motor is identical, can mutually switch, the transfer all the time of idle motor, also cannot realize on-bne repair and the object of changing fault motor.
(5) while adopting variable frequency control, the reliability of frequency converter is very crucial, once damage, can cause drive system normally to start and speed governing.
(6) above-mentioned drive system all cannot realize unit and not shut down the function that changes heat exchanger rotor rotation direction, to there being the boiler unit of specific (special) requirements, changing heat exchanger rotor and turn to and must shut down the rotation direction that resets motor.
Summary of the invention
The object of the invention is to solve cannot on-bne repair and change fault motor, changes the problem of heat exchanger rotor rotation direction, provides that a kind of reliability is high, the drive system of the rotary type heat exchanger of predigested running maintenance work.
In order to achieve the above object, the invention provides a kind of drive system of rotary type heat exchanger, comprise the 3rd reductor, it is characterized in that, one end of the 3rd described reductor is connected with one end of the first magnetic couple device, the other end of the first magnetic couple device is connected with the round end of the second main motor, the other end of the second main motor is connected with control cabinet, the other end of the 3rd reductor is connected with one end of the second magnetic couple device, the other end of the second magnetic couple device is connected with the round end of the second auxiliary-motor, the other end of the second auxiliary-motor is connected with control cabinet, control cabinet and rotor velocity-measuring system, power supply connects.
Preferably, the second described magnetic couple device comprises brake, one side of brake is provided with shaft joint, the opposite side of brake is provided with permanent magnetic speed-adjusting type magnetic coupling, in permanent magnetic speed-adjusting type magnetic coupling, be provided with conductor disc, permanent magnetic speed-adjusting type magnetic coupling is provided with magnet, and conductor disc is connected with adjusting actuator, and adjusting actuator comprises manual dish, actuating motor.
Preferably, described conductor disc and the interstice coverage between magnet are 1～10mm, and realizing the Acceleration of starting time is 10～50s.
Preferably, described conductor disc and the interstice coverage between magnet are generally 2～5mm.
Preferably, the first described magnetic couple device is permanent-magnet coupler or the second magnetic couple device.
Preferably, the second described main motor is identical with the power of the second auxiliary-motor.
The present invention relates to a kind of drive system of air preheater, can realize the capacity such as major-minor transmission standby mutually, adopt magnetic coupling to do to start buffer protection equipment, can cancel fluid coupling or the frequency-variable controller of rotary type heat exchanger drive system; Adopt permanent magnetic speed-adjusting type magnetic coupling to substitute traditional freewheel clutch, can realize stepless speed regulation; The present invention can realize the not transfer completely of inoperative motor, improves the tolerance deviation range that motor and speed reducer is installed axiality, makes to change online motor and is called possibility; Can also realize major-minor motor and switch online, complete online the functions such as switching heat exchanger rotor turns to.The present invention can improve and improve function and the reliability of huge revolving formula heat exchanger, and predigested running maintenance work.
The present invention also has the following advantages:
(1) plain edition system can substitute the drive system of existing employing fluid coupling and general freewheel clutch, cancel fluid coupling or frequency converter, permanent-magnet coupler can allow the coaxiality deviation of 5mm, without oil design, substantially without maintenance requirement, can greatly improve equipment dependability.
(2) permanent magnetic speed-adjusting type magnetic coupling regulates the conductor disc of permanent magnetic speed-adjusting type magnetic coupling inside and the gap between magnet (being contained on permanent magnetic speed-adjusting type magnetic coupling) by adjusting actuator, the output speed of permanent magnetic speed-adjusting type magnetic coupling is relevant with the size of this gap, increase output speed with gap reduces, and there is constant relation with gap length, therefore can be by presetting the data presetting output speed in conductor disc and gap, thereby realize speed-regulating function, gap greatly to a certain extent after, output speed is very low, approach zero, with brake can guarantee to be connected with the motor rotating speed of side, be now zero, realize the object of not transfer of inoperative motor completely.
(3) adopt permanent magnetic speed-adjusting type magnetic coupling can not only realize reductor input speed governing and realize not transfer of motor completely, substitute freewheel clutch and frequency converter, can also realize the needs of online replacing motor.After motor does not rotate, by disintegration shaft joint, can on-bne repair or remove fault motor, because permanent magnetic speed-adjusting type magnetic coupling requires very low (the maximum 3～5mm of permission) to the axiality of both sides, thereby after motor reassembles, without carrying out meticulous adjustment axis work with reductor, thereby guarantee to there will not be the new possible breakdowns such as vibration, heating after online replacing motor.
(4) perfect form system has further improved reliability on the basis of plain edition system; realized the standby completely mutually of two input motors; both sides input function is identical; all can guarantee heat exchanger band full load needs, all can realize the needs of starting protection, adjusting input speed and online gap motor.
(5) basic model and perfect form can expand heat exchanger and rotate reverse needs.By installing scene additional, turn to control cabinet, can realize online heat exchanger rotor negative function.Heat exchanger generally allows online stall of short time (as being no more than 3 minutes), for this reason, the tach signal of heat exchanger is introduced to control cabinet, in the steam generator system machine operation that quits work, after heat exchanger rotor speed is reduced to zero, by control cabinet, changing work drive motor turns to, by adjusting actuator, change conductor disc and the magnet gap of permanent magnetic speed-adjusting type magnetic coupling, again dish moves heat exchanger rotor at a slow speed, after rotating a few, reduce the gap of permanent magnetic speed-adjusting type magnetic coupling to normal value, thereby realize the reverse full speed rotation of heat exchanger rotor.The difference of two systems is that basic model can realize by auxiliary-motor, and perfect form can be used arbitrary motor.
(6) perfect form design system, can be used in pin ra ck drive mode and centre-driven mode, without two sets of plan is set.When centre-driven mode, permanent magnetic speed-adjusting type magnetic coupling needs and adjusting actuator coordinates, and extends and starts governing time, reduces the startup impulsive force of reductor.In pin ra ck drive mode, can directly use single gap set point, according to fixing Acceleration of starting buffer time startup.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of pin ra ck drive mode rotary type heat exchanger drive system;
The schematic diagram of type of drive rotary type heat exchanger drive system centered by Fig. 2;
Fig. 3 is the structural representation of rotary type heat exchanger pin ra ck drive system;
Fig. 4 is the structural representation of rotary type heat exchanger centre-driven system;
Fig. 5 is the structural representation of basic model rotary type heat exchanger drive system;
Fig. 6 is the structural representation of perfect form rotary type heat exchanger drive system.
Description of reference numerals
1 is rotor, 2 is rotating shaft, 3 is upper bearing, 4 is lower bearing, 5 is top beam, 6 is in lower beam, 7 is the first reductor, 8 is reductor bracket, 9 is travelling gear, 10 is transmission shroud, 11 is upper and lower steel loop, 12 is bearing pin, 13 is supporting seat, 14 is extension, top, 15 is extension, bottom, 16 is the second reductor, 21 is the first main motor, 22 is fluid coupling, 23 is freewheel clutch, 24 is auxiliary reductor, 25 is the first auxiliary-motor, 26 is the auxiliary reductor of main transmission, 27 is the auxiliary reductor of auxiliary driving, 28 is frequency-variable controller, 30 is the 3rd reductor, 31 is the second main motor, 32 is the first coupling device, 33 is the second coupling device, 34 is permanent-magnet coupler, 35 is magnet, 36 is manually to coil, 37 is actuating motor, 38 is adjusting actuator, 39 is conductor disc, 40 is permanent magnetic speed-adjusting type magnetic coupling, 41 is brake, 42 is shaft joint, 43 is the second auxiliary-motor, 44 is control cabinet, 45 is rotor velocity-measuring system, 46 is power supply.
Embodiment
For the present invention is become apparent, hereby with preferred embodiment, and coordinate accompanying drawing to be described in detail below.
As shown in Figure 5, be the structural representation of basic model rotary type heat exchanger drive system.The present invention is a kind of drive system of rotary type heat exchanger, one end of the 3rd reductor 30 is connected with one end of the first magnetic couple device 32, the other end of the first magnetic couple device 32 is connected with the round end of the second main motor 31, the other end of the second main motor 31 is connected with control cabinet 44, the other end of the 3rd reductor 30 is connected with one end of the second magnetic couple device 33, the other end of the second magnetic couple device 33 is connected with the round end of the second auxiliary-motor 43, the other end of the second auxiliary-motor 43 is connected with control cabinet 44, control cabinet 44 and rotor velocity-measuring system 45, power supply 46 connects.By control cabinet 44, can realize online more switching heat-exchanger turns to.The second magnetic couple device 33 comprises brake 41, one side of brake 41 is provided with shaft joint 42, the opposite side of brake 41 is provided with permanent magnetic speed-adjusting type magnetic coupling 40, in permanent magnetic speed-adjusting type magnetic coupling 40, be provided with conductor disc 39, permanent magnetic speed-adjusting type magnetic coupling 40 is provided with magnet 35, conductor disc 39 is connected with adjusting actuator 38, and adjusting actuator 38 comprises manual dish 36, actuating motor 37.The first magnetic couple device 32 is that the main motor 31 of permanent-magnet coupler 34, the second is identical with the power of the second auxiliary-motor 43.
The present invention uses and verified on Practical Project, and has used time enough Operation trial, has good using value and prospect.
(1) starting protection: basic model design; by setting permanent-magnet coupler 34 and magnet 35 gaps of main motor side, realize; this gap is controlled within the scope of 1～10mm, and can realize the Acceleration of starting time is 10～50s, and conventionally setting this gap is 2～5mm.For centre-driven mode, the present invention will change permanent magnetic speed-adjusting type magnetic coupling 40 between starter motor and the 3rd reductor 30, and above-mentioned gap Xu Yong actuator progressively narrows down to 1～3mm left and right from 10～20mm, and adjustment process is generally more than 0.5 minute.
(2) regulate heat exchanger rotor speed: rely on permanent magnetic speed-adjusting type magnetic coupling 40, if heat exchanger rotor only need to be at several fixing rotary speed workings, the conductor disc 39 of permanent magnetic speed-adjusting type magnetic coupling 40 and magnet 35 gap data can be set to the numerical value of several correspondences, because the output speed of permanent magnetic speed-adjusting type magnetic coupling 40 is relevant with its power bracket, also relevant with its structure, output speed and conductor disc 39 are provided by magnetic coupling production company with the relation in magnet 35 gaps, set accordingly the normal rotation of heat exchanger rotor, water rinses, low speed jiggering, velocity of rotation when stopping and having other functional requirement, these gaps can regulate with adjusting actuator 38, simple method is to set electric machine rotation time or the position of adjusting actuator 38, corresponding with these output speeds that need.
(3) not transfer of motor function realizes: to base model system, auxiliary-motor 43 can be accomplished not transfer completely, and to perfect form system, non operating state motor can be accomplished not transfer arbitrarily.The permanent magnetic speed-adjusting type magnetic coupling 40 of work drive motor side, does not move conductor disc 39 and magnet 35 gaps to the maximum position that allows with adjusting actuator 38, connect the power supply of brake 41 after certain hour, and non-so not work drive motor is not transfer completely just.
(4) major-minor switching: major-minor switching is sent instruction by steam generator system DCS, after former work drive motor loses power supply in 0～3 minute, starting state gap is transferred in permanent magnetic speed-adjusting type magnetic coupling 40 inner wire dishes 39 and magnet 35 gaps, connect another motor power, just completed the switching of motor.
(5) change online motor: to base model system, can change online auxiliary-motor 43.At brake 41, complete after braking, take shaft joint 42 apart and fault motor can be thrown off, field-strip.The motor of repairing or renewing can be loaded onto again, only need and the rigging position of original motor basically identical just can, needn't excessively check the axiality (but axiality can not be greater than 5mm) of motor and reductor power shaft.
(6) online change heat exchanger rotor turns to: this function realizes by local control box 44, notices that the 3rd selected reductor 30 internal mechanical designs need to guarantee to allow reversion.Cut off after work at present motor power, the interior motor steering control element of control cabinet 44 should change the steering mode of major-minor motor simultaneously, more than the adjusting actuator 38 of work drive motor side is transferred to 10mm by conductor disc 39 and magnet 35 gaps, and guarantee that brake 41 is for releasing orientation, receive tach signal that rotor velocity-measuring system 45 transmits lower than 0.1, turn after the complete stall of about 3 minutes (preferably adding manual confirmation) rotors, starter motor starts drive system, maintaining rotor rotation is not less than after 1 circle, with adjusting actuator 38, progressively turn conductor disc 39 and magnet 35 gaps down 1～3mm (specifically according to magnetic coupling producer numerical value), realizing the reverse full speed of heat exchanger rotor rotates.
As shown in Figure 6, be the structural representation of perfect form rotary type heat exchanger drive system.The present invention is a kind of drive system of rotary type heat exchanger, and the first magnetic couple device 32 is the second magnetic couple device 33.With the difference of plain edition system (being the basic model rotary type heat exchanger drive system in embodiment 1) be that native system drives regardless of major-minor, only be to change the magnetic coupling of the main driving side of basic model 34 into permanent magnetic speed-adjusting type magnetic coupling 40, and configuring corresponding adjusting actuator 38 (containing actuating motor 37 and manual dish 36), other composition is identical with plain edition system.
The present invention uses and verified on Practical Project, and has used time enough Operation trial, has good using value and prospect.
(1) starting protection: the design of perfect form; by setting the permanent-magnet coupler 34 of main motor side or the conductor disc 39 of permanent magnetic speed-adjusting type magnetic coupling 40 and magnet 35 gaps, realize; this gap is controlled within the scope of 1～10mm; can realize the Acceleration of starting time is 10～50s, and conventionally setting this gap is 2～5mm.For centre-driven mode, the present invention will change permanent magnetic speed-adjusting type magnetic coupling 40 between starter motor and the 3rd reductor 30, and above-mentioned gap Xu Yong actuator progressively narrows down to 1～3mm left and right from 10～20mm, and adjustment process is generally more than 0.5 minute.
(2) regulate heat exchanger rotor speed: rely on permanent magnetic speed-adjusting type magnetic coupling 40, if heat exchanger rotor only need to be at several fixing rotary speed workings, the conductor disc 39 of permanent magnetic speed-adjusting type magnetic coupling 40 and magnet 35 gap data can be set to the numerical value of several correspondences, because the output speed of permanent magnetic speed-adjusting type magnetic coupling 40 is relevant with its power bracket, also relevant with its structure, output speed and conductor disc 39 are provided by magnetic coupling production company with the relation in magnet 35 gaps, set accordingly the normal rotation of heat exchanger rotor, water rinses, low speed jiggering, velocity of rotation when stopping and having other functional requirement, these gaps can regulate with adjusting actuator 38, simple method is to set electric machine rotation time or the position of adjusting actuator 38, corresponding with these output speeds that need.
(3) not transfer of motor function realizes: to perfect form system, non operating state motor can be accomplished not transfer arbitrarily.The permanent magnetic speed-adjusting type magnetic coupling 40 of work drive motor side, does not move conductor disc 39 and magnet 35 gaps to the maximum position that allows with adjusting actuator 38, connect the power supply of brake 41 after certain hour, and non-so not work drive motor is not transfer completely just.
(4) major-minor switching: major-minor switching is sent instruction by steam generator system DCS, after former work drive motor loses power supply in 0～3 minute, starting state gap is transferred in permanent magnetic speed-adjusting type magnetic coupling 40 inner wire dishes 39 and magnet 35 gaps, connect another motor power, just completed the switching of motor.
(5) change online motor: to perfect form, main motor 31 and auxiliary-motor 43 all can be realized.At brake 41, complete after braking, take shaft joint 42 apart and fault motor can be thrown off, field-strip.The motor of repairing or renewing can be loaded onto again, only need and the rigging position of original motor basically identical just can, needn't excessively check the axiality (but axiality can not be greater than 5mm) of motor and reductor power shaft.
(6) online change heat exchanger rotor turns to: this function realizes by local control box 44, notices that the 3rd selected reductor 30 internal mechanical designs need to guarantee to allow reversion.Cut off after work at present motor power, the interior motor steering control element of control cabinet 44 should change the steering mode of major-minor motor simultaneously, more than the adjusting actuator 38 of work drive motor side is transferred to 10mm by conductor disc 39 and magnet 35 gaps, and guarantee that brake 41 is for releasing orientation, receive tach signal that rotor velocity-measuring system 45 transmits lower than 0.1, turn after the complete stall of about 3 minutes (preferably adding manual confirmation) rotors, starter motor starts drive system, maintaining rotor rotation is not less than after 1 circle, with adjusting actuator 38, progressively turn conductor disc 39 and magnet 35 gaps down 1～3mm (specifically according to magnetic coupling producer numerical value), realizing the reverse full speed of heat exchanger rotor rotates.
Claims (5)
1. the drive system of a rotary type heat exchanger, comprise the 3rd reductor (30), it is characterized in that, one end of the 3rd described reductor (30) is connected with one end of the first magnetic couple device (32), the other end of the first magnetic couple device (32) is connected with the round end of the second main motor (31), the other end of the second main motor (31) is connected with control cabinet (44), the other end of the 3rd reductor (30) is connected with one end of the second magnetic couple device (33), the other end of the second magnetic couple device (33) is connected with the round end of the second auxiliary-motor (43), the other end of the second auxiliary-motor (43) is connected with control cabinet (44), control cabinet (44) and rotor velocity-measuring system (45), power supply (46) connects, the second described magnetic couple device (33) comprises brake (41), one side of brake (41) is provided with shaft joint (42), the opposite side of brake (41) is provided with permanent magnetic speed-adjusting type magnetic coupling (40), in permanent magnetic speed-adjusting type magnetic coupling (40), be provided with conductor disc (39), permanent magnetic speed-adjusting type magnetic coupling (40) is provided with magnet (35), conductor disc (39) is connected with adjusting actuator (38), adjusting actuator (38) comprises manual dish (36), actuating motor (37).
2. the drive system of a kind of rotary type heat exchanger as claimed in claim 1, is characterized in that, the interstice coverage between described conductor disc (39) and magnet (35) is 1～10mm, and realizing the Acceleration of starting time is 10～50s.
3. the drive system of a kind of rotary type heat exchanger as claimed in claim 2, is characterized in that, the interstice coverage between described conductor disc (39) and magnet (35) is 2～5mm.
4. the drive system of a kind of rotary type heat exchanger as claimed in claim 1, it is characterized in that, the first described magnetic couple device (32) is that the structure of permanent-magnet coupler (34) or described the first magnetic couple device (32) is identical with the structure of the second magnetic couple device (33).
5. the drive system of a kind of rotary type heat exchanger as claimed in claim 1, is characterized in that, the second described main motor (31) is identical with the power of the second auxiliary-motor (43).
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| CN201210236954.3A CN102751845B (en) | 2012-07-09 | 2012-07-09 | Transmission system of rotary-type heat exchanger |
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| CN201210236954.3A CN102751845B (en) | 2012-07-09 | 2012-07-09 | Transmission system of rotary-type heat exchanger |
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| CN102969944B (en) * | 2012-11-05 | 2016-05-11 | 无锡新大力电机有限公司 | A kind of high capacity motor starter |
| AT515934B1 (en) * | 2014-09-22 | 2016-01-15 | Gerald Dipl Ing Hehenberger | Powertrain of an energy recovery plant |
| CN104864408B (en) * | 2015-05-20 | 2017-03-15 | 大唐国际发电股份有限公司陡河发电厂 | Thermal power plant is arranged vertically rotary regenerative air heater electrical machmary maintenance method |
| CN105048767B (en) * | 2015-07-14 | 2017-08-08 | 国电龙源节能技术有限公司 | The equipment that load speed is switched between power frequency rotating speed and permanent magnetic speed-adjusting |
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| DE10219080A1 (en) * | 2002-04-29 | 2003-11-20 | Voith Turbo Kg | Drive system, in particular for motor vehicles |
| CN201113759Y (en) * | 2006-05-26 | 2008-09-10 | 广州广重企业集团有限公司 | Magnetic force coupling gearing device |
| CN201297373Y (en) * | 2008-09-27 | 2009-08-26 | 陕西科技大学 | Mechanical reduction gear with controllable starting |
| US7931107B2 (en) * | 2009-02-02 | 2011-04-26 | Jones Jr John | Vehicle kinetic energy utilization transmission system |
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