CN104742729B - A kind of wheel hub motor electromagnetic clutch device - Google Patents

A kind of wheel hub motor electromagnetic clutch device Download PDF

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Publication number
CN104742729B
CN104742729B CN201510061819.3A CN201510061819A CN104742729B CN 104742729 B CN104742729 B CN 104742729B CN 201510061819 A CN201510061819 A CN 201510061819A CN 104742729 B CN104742729 B CN 104742729B
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CN
China
Prior art keywords
aixs cylinder
electromagnetic clutch
wheel hub
hub motor
pair
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Expired - Fee Related
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CN201510061819.3A
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Chinese (zh)
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CN104742729A (en
Inventor
辜承林
于伟光
吴丹
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Huazhong University of Science and Technology
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Huazhong University of Science and Technology
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Priority to CN201510061819.3A priority Critical patent/CN104742729B/en
Publication of CN104742729A publication Critical patent/CN104742729A/en
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Publication of CN104742729B publication Critical patent/CN104742729B/en
Expired - Fee Related legal-status Critical Current
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Abstract

The invention discloses a kind of wheel hub motor electromagnetic clutch device, including wheel hub motor, aixs cylinder formula electromagnetic clutch, driving pair and the driven pair of friction-type, described aixs cylinder formula electromagnetic clutch is embedded on wheel hub motor, aixs cylinder formula electromagnetic clutch drives driving pair axially-movable, the rubbing surface of driving pair is contacted with driven secondary rubbing surface, band motor car wheel rotation;From during action, aixs cylinder formula electromagnetic clutch drives driving pair to withdraw, and the rubbing surface of driving pair is separated with driven secondary rubbing surface, interrupts power transmission;The invention also discloses another kind of wheel hub motor electromagnetic clutch device, including wheel hub motor, aixs cylinder formula electromagnetic clutch and the driven pair of sliding pin type, engaged by the pin-and-hole in aixs cylinder formula electromagnetic clutch aixs cylinder directly pair driven with sliding pin type, carry motor car wheel synchronous rotary;From during action, aixs cylinder formula electromagnetic clutch aixs cylinder withdraws, and separates with the pin-and-hole in driven pair, interrupts power transmission;The present invention provides both wheel hub motor electromagnetic clutch devices, has the characteristics that compact conformation and energy-conservation, can the mechanical shock of slow release electric automobile start-stop process and electromagnetic impact effectively.

Description

A kind of wheel hub motor electromagnetic clutch device
Technical field
The invention belongs to clutch of electric automobile technical field, more particularly, to a kind of wheel hub motor electromagnetic clutch dress Put.
Background technology
In the prior art of wheel hub electric automobile, wheel hub motor and wheel hub are how by the way of being fastenedly connected, and are provided without Clutch, therefore unavoidably occurs mechanical shock, especially gets impatient the stopping time anxious, electric automobile velocity perturbation leads to comfort Difference;In addition there is also electromagnetic impact, motor starting currents are big, affect battery life, braking counter electromotive force is big, jeopardizes control Device.And clutch can significantly alleviate dynamic impact as a kind of flexible connecting device.
Existing fuel oil type vapour vehicle clutch mainly includes slip clutch, electromagnetic clutch etc..Friction-type from Clutch using release yoke stir release bearing make frictional disk engage or separate Flywheel disc, axial distance larger it is difficult to be applied to narrow In little wheel hub space;Electromagnetic clutch controls the clutch action of clutch by the power on/off of coil, need to hold during joint Continuous power supply, power consumption is big, is not suitable for electric automobile.
Content of the invention
Disadvantages described above for prior art or Improvement requirement, the invention provides a kind of wheel hub motor electromagnetic clutch dress Put, its object is to realize aixs cylinder formula electromagnetic clutch to automotive dynamoelectric machine impact and electricity with embedding wheel hub motor low energy consumption The slow release of magnetic impact.
For achieving the above object, according to one aspect of the present invention, there is provided a kind of wheel hub motor electromagnetic clutch device, bag Include aixs cylinder formula electromagnetic clutch, wheel hub motor, driving pair and the driven pair of friction-type;
Aixs cylinder formula electromagnetic clutch includes spill base, slideway, slide block, coil, the first aixs cylinder, the second aixs cylinder, first forever Magnet and the second permanent magnet;There is boss at the middle part of spill base, and there is side wall at two ends, and side wall has hole;Slideway is placed in described convex On platform, slide block is placed in slideway, and slide block two ends are fastenedly connected with the first aixs cylinder, the second aixs cylinder respectively;Coil is wound in the same direction Slideway outer layer two ends;First permanent magnet and the second permanent magnet are separately mounted to the inner side of spill base side wall, two permanent magnet poles Opposite placement;First aixs cylinder passes through the hole of the first permanent magnet and base one avris wall, and the second aixs cylinder passes through the second permanent magnet and bottom The hole of another avris wall of seat;
Wheel hub motor is the default minor structure of outer rotor, rotor outer circle is evenly arranged with no less than 3 grooves, aixs cylinder formula electricity Magnet clutch is embedding in a groove, and the outer surface of described aixs cylinder formula electromagnetic clutch is concordant with rotor outer circle;The end of described groove Leave gap and supply the free axial action of the second aixs cylinder;The main shaft of wheel hub motor accesses the bearing inner race in wheel hub;
In driving pair, circumference is evenly distributed with draw-in groove, and the first aixs cylinder embeds described draw-in groove, is fastenedly connected with driving pair;Described The side of the corresponding wheel hub of driving pair is rubbing surface;
The driven pair of friction-type is fixed on hub for vehicle wheel, the rubbing surface of the driven secondary rubbing surface of described friction-type and driving pair Corresponding.
When aixs cylinder formula electromagnetic clutch conjunction action, first axle stretches out, and drives driving pair axially-movable, the rubbing of driving pair Wiping face is contacted with driven secondary rubbing surface, band motor car wheel rotation;From during action, the first aixs cylinder drives driving pair to withdraw to clutch, The rubbing surface of driving pair is separated with driven secondary rubbing surface, interrupts power transmission.
Preferably, described groove is dovetail groove or T-slot.
Preferably, described rubbing surface is formed by spraying friction material on end face.
For realizing objects of the invention, it is also provided another kind of wheel hub motor electromagnetic clutch device, including aixs cylinder formula electromagnetism Clutch, wheel hub motor and the driven pair of sliding pin type;
Aixs cylinder formula electromagnetic clutch includes spill base, slideway, slide block, coil, the first aixs cylinder, the second aixs cylinder, first forever Magnet and the second permanent magnet;There is boss at the middle part of spill base, and there is side wall at two ends, and side wall has hole;Slideway is placed in described convex On platform, slide block is placed in slideway, and slide block two ends are fastenedly connected with the first aixs cylinder, the second aixs cylinder respectively;Coil is wound in the same direction Slideway outer layer two ends;First permanent magnet and the second permanent magnet are separately mounted to the inner side of spill base side wall, two permanent magnet poles Opposite placement;First aixs cylinder passes through the hole of the first permanent magnet and base one avris wall, and the second aixs cylinder passes through the second permanent magnet and bottom The hole of another avris wall of seat;
Wheel hub motor is the default minor structure of outer rotor, rotor outer circle is evenly arranged with no less than 3 grooves, described aixs cylinder Formula electromagnetic clutch is embedding in a groove, and the outer surface of described aixs cylinder formula electromagnetic clutch is concordant with rotor outer circle;Described groove End is left gap and is supplied the free axial action of the second aixs cylinder;The main shaft of wheel hub motor accesses the bearing inner race in wheel hub;
The driven pair of sliding pin type is fixed on hub for vehicle wheel, and on end face corresponding with aixs cylinder formula electromagnetic clutch, circumference is uniformly divided It is furnished with pin-and-hole, by guiding shallow slot connection between pin-and-hole, described guiding shallow slot plays the effect that guiding the first aixs cylinder is engaged with pin-and-hole;Institute State the first aixs cylinder engageable with pin-and-hole or separate.
When aixs cylinder formula electromagnetic clutch conjunction action, first axle stretches out, and the pin-and-hole in pair driven with sliding pin type engages, band Motor car wheel synchronous rotary;From during action, the first aixs cylinder withdraws clutch, and aixs cylinder is separated with pin-and-hole, interrupts power transmission.
In general, by the contemplated above technical scheme of the present invention compared with prior art, can obtain down and show Beneficial effect:
(1) because the wheel hub motor electromagnetic clutch device that the present invention provides employs permanent magnet, by permanent magnet to slide block Magnetic attraction, aixs cylinder formula electromagnetic clutch keep stable state output when need not power, only stable state switching when be passed through pulse current, energy Loss is less so that adopt the electric automobile more energy-conservation of the wheel hub motor electromagnetic clutch device of present invention offer;
(2) because the wheel hub motor electromagnetic clutch device that the present invention provides adopts aixs cylinder formula electromagnetic clutch, can achieve electricity Machine is separated with wheel, therefore compared to current wheel hub electric automobile, employ the present invention offer wheel hub motor electromagnetism from Attach together the electric automobile put wheel hub motor can starting under no load, starting current has compared to the wheel hub electric automobile of no arrangement of clutch It is remarkably decreased, reduce the loss to battery;
(3) adopt the present invention provide wheel hub motor electromagnetic clutch device wheel hub electric automobile stop when, aixs cylinder formula The action of electromagnetic clutch elder generation, wheel hub motor is separated with wheel, naturally stops, motor is not in due to brake hard after power-off The impact counter electromotive force leading to, it is to avoid damage to electric machine controller;
(4) the aixs cylinder formula electromagnetic clutch in the wheel hub motor electromagnetic clutch device being provided due to the present invention belongs to a kind of soft Property attachment means it is achieved that flexible connection between motor and wheel, steadily, ride quality is high for power transmission;
(5) the first wheel hub motor electromagnetic clutch device that the present invention provides, employs driving pair and the driven pair of friction-type The mode of cooperation, engaging process is soft, separates thoroughly, has good effect in terms of slow release mechanical shock and electromagnetic impact, Wheel hub electric automobile pause and transition in rhythm or melody sense reduction in start-stop of the wheel hub motor electromagnetic clutch device of present invention offer is therefore provided, improves Also reduce the damage to battery and controller for the electromagnetic impact while ride quality, extend the use of battery and controller Life-span;
(6) the second wheel hub motor electromagnetic clutch device that the present invention provides, the first aixs cylinder of aixs cylinder formula electromagnetic clutch Directly pair driven with sliding pin type engages, and eliminates driving pair, and structure simply it is easy to assembling, has manufacturing process more simple Feature;
(7) compared to traditional Vehicular clutch device, the wheel hub motor electromagnetic clutch device that the present invention provides is respectively provided with knot The compact feature of structure, is not take up space in excessive wheel hub.
Brief description
Fig. 1 is aixs cylinder formula electromagnetic clutch structure chart;
Fig. 2 is the cross section view of aixs cylinder formula electromagnetic clutch;
Fig. 3 is aixs cylinder formula electromagnetic clutch, driving pair and the wheel hub motor installation diagram of embodiment 1;
Fig. 4 is the wheel hub inner structure figure of embodiment 1;
Fig. 5 is embodiment 2 aixs cylinder formula electromagnetic clutch and wheel hub motor installation diagram;
Fig. 6 is the wheel hub inner structure figure of embodiment 2;
Fig. 7 is the assembling detail figure of aixs cylinder formula electromagnetic clutch and wheel hub motor in embodiment 1 and embodiment 2;
Fig. 8 is the cross section view of embodiment 1;
Fig. 9 is the cross section view of embodiment 2;
In all of the figs, identical reference is used for representing identical element or structure, wherein:1- spill base, 2- slideway, 3- slide block, 4- coil, 5- first permanent magnet, 6- second permanent magnet, 7- first aixs cylinder, 8- second aixs cylinder, 9- aixs cylinder formula The driven pair of electromagnetic clutch, 10- wheel hub motor, 11- friction-type driving pair, 12- friction-type, 13- wheel, 14- bearing, 15- are tight Gu screw, the driven pair of 16- sliding pin type.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and It is not used in the restriction present invention.As long as additionally, involved technical characteristic in each embodiment of invention described below The conflict of not constituting each other just can be mutually combined.
Aixs cylinder formula electromagnetic clutch 9 of the present invention as depicted in figs. 1 and 2, including spill base 1, slideway 2, slide block 3rd, coil 4, the first permanent magnet 5, the second permanent magnet 6, the first aixs cylinder 7, the second aixs cylinder 8;Slideway 2 is placed in the middle part of spill base 1 Boss on, 1 liang of side wall of base is respectively fitted with the first permanent magnet 5 and the second permanent magnet 6, and two permanent magnet poles is opposite Place;Slide block 3 is placed in slideway 2, and its two ends is fastenedly connected with the first aixs cylinder 7 and the second aixs cylinder 8 respectively, and two aixs cylinders are each passed through Hole on homonymy permanent magnet and base side wall;Coil 4 is wound on slideway 2 outer layer two ends in the same direction;Coil 4 is passed through with agreement direction Pulse current, the active force that slide block 3 is magnetized by magnetic field moves, and slide block slides into the other end by initial steady state and realizes bistable state Switching.
Further explain the present invention below in conjunction with specific embodiment.
Embodiment 1:
Wheel hub motor 10 is assembled as shown in Figure 3 and Figure 7 with aixs cylinder formula electromagnetic clutch 9, and wheel hub motor 10 is in outer rotor Stator structure, rotor outer circle circumference is evenly distributed with the individual dovetail groove of N (N >=3), and dovetail groove extends along motor end face, electromagnetic clutch In device 9 embedded groove, groove end is left gap and is supplied the free axial action of the second aixs cylinder 8.Three clutches have only schematically been drawn in Fig. 3 Device 9, the particular number of clutch 9 is depending on the level of torque of motor and actual demand.
One side end face of the corresponding wheel hub of driving pair 11 is rubbing surface, and the first aixs cylinder 7 passes through uniform point of circumference in driving pair 11 The draw-in groove of cloth and driving pair are fastenedly connected;During electromagnetic clutch 9 clutch action, slide block 3, the first aixs cylinder 7, the second aixs cylinder 8 and master Dynamic secondary 11 synchronous axially-movables.
Wheel hub inner structure as shown in figure 4, friction-type driven secondary 12 is fixed on wheel hub by screw 15, driven secondary 12 friction Face is corresponding with the rubbing surface in driving pair 11, and the main shaft of wheel hub motor 10 accesses bearing 14 inner ring in wheel.
The work process of the wheel hub motor electromagnetic clutch device providing below in conjunction with Fig. 8 illustrated embodiments 1:
During electric automobile starting, aixs cylinder formula electromagnetic clutch 9 is in from stable state, and the first aixs cylinder 7 does not extend out, and driving pair 11 is not Contact with wheel 13;Wheel hub motor 10 starting under no load first simultaneously accelerates to rotate, and then clutch coil 4 is passed through the arteries and veins in agreement direction Rush electric current, slide block 3 is magnetized;Slide block 3 two ends are subject to the magnetic attraction of permanent magnet and magnetic repulsion to slide respectively, aixs cylinder formula electromagnetism from Clutch 9 from switching to conjunction stable state from stable state, stretch out drive driving pair 11 action and produce axial displacement by the first aixs cylinder 7;Second aixs cylinder 8 Synchronization produces displacement but is still located in the hole of concave bottom seat 1 side wall, shearing force mistake when preventing driving pair 11 from contacting with driven secondary 12 Aixs cylinder formula electromagnetic clutch 9 deformation is led to greatly even to be lost efficacy.
From changing to after conjunction stable state from stable state, slide block 3 is subject to the magnetic attraction of the first permanent magnet 5 to aixs cylinder formula electromagnetic clutch 9, Realize stable state to keep, additional energy need not be consumed, driving pair 11 axial displacement contact simultaneously driven secondary 12;Two rubbing surfaces are in aixs cylinder The retentivity effect of formula electromagnetic clutch 9 is lower to produce moment of friction, carries motor car wheel 13 synchronous rotary.
When electric automobile stops, the first action of electromagnetic clutch 9, coil 4 is passed through in opposite direction when starting to walk with electric automobile Pulse current, slide block 3 is magnetized and is slided by electromagnetic force, and aixs cylinder formula electromagnetic clutch 9 switches to from stable state from conjunction stable state, the One aixs cylinder 7 withdraws and drives driving pair 11 driven with friction-type secondary 12 to separate, and interrupts the transmission of motor power.
Embodiment 2:
The assembling mode of wheel hub motor 10 and aixs cylinder formula electromagnetic clutch 9 is in the same manner as in Example 1, as Fig. 5 and Fig. 7 institute Show, wheel hub motor 10 is the default minor structure of outer rotor, rotor outer circle circumference is evenly distributed with the individual dovetail groove of N (N >=3), dovetail groove Extend along motor end face, in electromagnetic clutch 9 embedded groove;As different from Example 1, embodiment 2 does not have driving pair, and driven Secondary is the driven pair of sliding pin type;Power transmission rely on first aixs cylinder 7 of electromagnetic clutch 9 drive be fixed on sliding pin type on wheel hub from Dynamic secondary 16 complete.
Sliding pin type driven secondary 16 as shown in fig. 6, on one side end face even circumferential pin-and-hole is distributed with, by guiding between pin-and-hole Shallow slot connects, and the first aixs cylinder 7 of electromagnetic clutch 9 is engageable with pin-and-hole or separates.
Work process below in conjunction with such as Fig. 9 illustrated embodiments 2:
During electric automobile starting, aixs cylinder formula electromagnetic clutch 9 is in from stable state;Wheel hub motor 10 starting under no load first, and Clutch coil 4 is passed through pulse current, clutch 9 conjunction action afterwards, and the first aixs cylinder 7 is stretched out and is connected with the pin-and-hole on driven secondary 16, Band motor car wheel 13 synchronous rotary.
When electric automobile stops, clutch coil 4 is passed through and pulse current in opposite direction during vehicle starting, clutch 9 From action, the first aixs cylinder 7 is withdrawn and is separated with the pin-and-hole on driven secondary 16, interrupts the transmission of motor power.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, not in order to Limit the present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc., all should comprise Within protection scope of the present invention.

Claims (7)

1. a kind of wheel hub motor electromagnetic clutch device is it is characterised in that described device includes aixs cylinder formula electromagnetic clutch, wheel hub electricity Machine, driving pair and the driven pair of friction-type;
Described aixs cylinder formula electromagnetic clutch includes spill base, slideway, slide block, coil, the first aixs cylinder, the second aixs cylinder, first forever Magnet and the second permanent magnet;There is boss at the middle part of spill base, and there is side wall at two ends, and side wall has hole;Slideway is placed in described convex On platform, slide block is placed in slideway, and slide block two ends are fastenedly connected with the first aixs cylinder, the second aixs cylinder respectively;Coil is wound in the same direction Slideway outer layer two ends;First permanent magnet and the second permanent magnet are separately mounted to the inner side of spill base side wall, two permanent magnet poles Opposite placement;First aixs cylinder passes through the hole of the first permanent magnet and base one avris wall, and the second aixs cylinder passes through the second permanent magnet and bottom The hole of another avris wall of seat;
Described wheel hub motor is the default minor structure of outer rotor, rotor outer circle is evenly arranged with no less than 3 grooves, aixs cylinder formula electricity Magnet clutch is embedded in described groove, and the outer surface of described aixs cylinder formula electromagnetic clutch is concordant with rotor outer circle;Described groove End is left gap and is supplied the free axial action of the second aixs cylinder;The main shaft of wheel hub motor accesses the bearing inner race in wheel hub;
In described driving pair, circumference is evenly distributed with draw-in groove, and the first aixs cylinder embeds described draw-in groove, is fastenedly connected with driving pair;Described The side of the corresponding wheel hub of driving pair is rubbing surface;
The driven pair of described friction-type is fixed on hub for vehicle wheel, the rubbing surface of the driven secondary rubbing surface of described friction-type and driving pair Corresponding.
2. wheel hub motor electromagnetic clutch device as claimed in claim 1 is it is characterised in that described groove is dovetail groove or T-shaped Groove.
3. wheel hub motor electromagnetic clutch device as claimed in claim 1 or 2 is it is characterised in that described rubbing surface passes through at end On face, spraying friction material is formed.
4. wheel hub motor electromagnetic clutch device as claimed in claim 1 or 2 is it is characterised in that work as aixs cylinder formula electromagnetic clutch When carrying out conjunction action, first axle stretches out, and drives driving pair axially-movable, and the rubbing surface of driving pair is connect with driven secondary rubbing surface Touch, band motor car wheel rotation;Clutch carries out from during action, and the first aixs cylinder drives driving pair to withdraw, the rubbing surface of driving pair with from Dynamic secondary rubbing surface separates, and interrupts power transmission.
5. a kind of wheel hub motor electromagnetic clutch device is it is characterised in that described device includes aixs cylinder formula electromagnetic clutch, wheel hub electricity Machine and the driven pair of sliding pin type;
Described aixs cylinder formula electromagnetic clutch includes spill base, slideway, slide block, coil, the first aixs cylinder, the second aixs cylinder, first forever Magnet and the second permanent magnet;There is boss at the middle part of spill base, and there is side wall at two ends, and side wall has hole;Slideway is placed in described convex On platform, slide block is placed in slideway, and slide block two ends are fastenedly connected with the first aixs cylinder, the second aixs cylinder respectively;Coil is wound in the same direction Slideway outer layer two ends;First permanent magnet and the second permanent magnet are separately mounted to the inner side of spill base side wall, two permanent magnet poles Opposite placement;First aixs cylinder passes through the hole of the first permanent magnet and base one avris wall, and the second aixs cylinder passes through the second permanent magnet and bottom The hole of another avris wall of seat;
Described wheel hub motor is the default minor structure of outer rotor, rotor outer circle is evenly arranged with no less than 3 grooves, aixs cylinder formula electricity Magnet clutch is embedded in described groove, and the outer surface of described aixs cylinder formula electromagnetic clutch is concordant with rotor outer circle;Described groove End is left gap and is supplied the free axial action of the second aixs cylinder;The main shaft of wheel hub motor accesses the bearing inner race in wheel hub;
The driven pair of described sliding pin type is fixed on hub for vehicle wheel, and on end face corresponding with aixs cylinder formula electromagnetic clutch, circumference is uniformly point It is furnished with pin-and-hole, by guiding shallow slot connection between pin-and-hole, described guiding shallow slot plays the effect that guiding the first aixs cylinder is engaged with pin-and-hole;Institute State the first aixs cylinder engageable with pin-and-hole or separate.
6. wheel hub motor electromagnetic clutch device as claimed in claim 5 is it is characterised in that described groove is dovetail groove or T-shaped Groove.
7. the wheel hub motor electromagnetic clutch device as described in claim 5 or 6 is it is characterised in that work as aixs cylinder formula electromagnetic clutch When carrying out conjunction action, first axle stretches out, and the pin-and-hole in pair driven with sliding pin type engages, and carries motor car wheel synchronous rotary;Clutch Carry out from during action, the first aixs cylinder withdraws, aixs cylinder is separated with pin-and-hole, interrupt power transmission.
CN201510061819.3A 2015-02-05 2015-02-05 A kind of wheel hub motor electromagnetic clutch device Expired - Fee Related CN104742729B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2802833Y (en) * 2005-02-05 2006-08-02 毛世琨 Planetary automatic speed change system of hub machine
CN102390252A (en) * 2011-09-19 2012-03-28 尹永河 Intelligent clutch of electric automobile hub motor
CN103122951A (en) * 2011-11-21 2013-05-29 华中科技大学 Electromagnetic clutch
DE102013007924A1 (en) * 2012-05-10 2013-11-14 Goldhofer Aktiengesellschaft Drive device for motor vehicles

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5647946B2 (en) * 2011-06-07 2015-01-07 本田技研工業株式会社 Vehicle drive device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2802833Y (en) * 2005-02-05 2006-08-02 毛世琨 Planetary automatic speed change system of hub machine
CN102390252A (en) * 2011-09-19 2012-03-28 尹永河 Intelligent clutch of electric automobile hub motor
CN103122951A (en) * 2011-11-21 2013-05-29 华中科技大学 Electromagnetic clutch
DE102013007924A1 (en) * 2012-05-10 2013-11-14 Goldhofer Aktiengesellschaft Drive device for motor vehicles

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