CN108501672A - Power drive system - Google Patents
Power drive system Download PDFInfo
- Publication number
- CN108501672A CN108501672A CN201710105201.1A CN201710105201A CN108501672A CN 108501672 A CN108501672 A CN 108501672A CN 201710105201 A CN201710105201 A CN 201710105201A CN 108501672 A CN108501672 A CN 108501672A
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- China
- Prior art keywords
- gear
- output shaft
- sun gear
- drive system
- connecting portion
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
- B60K17/06—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing
- B60K17/08—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing of mechanical type
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Retarders (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
This application discloses a kind of power drive systems, including motor and retarder.The axle center of the output shaft of motor is the first center line.Retarder includes sun gear, ring gear, double-planetary gear and planet carrier.Sun gear fixes the periphery for being set in output shaft.Ring gear is coaxial with sun gear.The first gear of double-planetary gear is engaged with sun gear, and the second gear of double-planetary gear is engaged with ring gear.The first connecting portion of planet carrier is rotatablely connected output shaft, so that output shaft supports planet carrier on the direction of vertical first center line.The second connecting portion of planet carrier is rotated around the first center line.The third interconnecting piece of planet carrier is rotatably connected at the axle center of second gear.Output shaft drives sun gear rotation so that first gear and second gear synchronously rotation and the revolution simultaneously between sun gear and ring gear, second gear drive third interconnecting piece to be rotated around the first center line so that second connecting portion rotates.It is small that the reduction ratio of the power drive system promotes difficulty.
Description
Technical field
This application involves electric vehicle engineering field more particularly to a kind of power drive systems.
Background technology
The existing electric vehicle using planetary gear train transmission system is mostly to use NGW type planetary gear trains, i.e.,：Rotor axis of electric
Output end and planetary gear speed reducer sun gear connect, ring gear is connect with shell, according to sun gear, planetary gear and internal tooth
The gear engaged transmission principle of circle, eventually by the rotating speed and power of planet carrier output motor.NGW type planetary gear speed reducers
Reduction ratio i1HCalculation formula is：
i1H=z2/z1+1。
Wherein, z1For the number of teeth of sun gear；z2For the number of teeth of ring gear.
In order to meet the accelerating ability and high speed performance of electric automobile whole, the development of dynamical system slows down to electric vehicle
The reduction ratio of device proposes higher demand.By above-mentioned reduction ratio i1HCalculation formula is it is found that can pass through the number of teeth of increase ring gear
Or reduce the number of teeth of sun gear to promote the reduction ratio of retarder.However, retarder can then be increased by increasing the number of teeth of ring gear
Radial dimension causes the installation space limitation that retarder is difficult to meet power transmission system for electric vehicle part to require；Reduce too
It is poor that the number of teeth of sun wheel is then easy to cause reducer structure stability, to make retarder functional reliability under high-speed overload operating mode
It is very poor, vibration is apparent, noise is big, therefore the reduction ratio of existing NGW types planetary reduction gear is difficult to be promoted.
Invention content
The embodiment of the present application technical problem to be solved is, provides a kind of power transmission that reduction ratio promotion difficulty is small
System.
To achieve the goals above, the embodiment of the present application adopts the following technical scheme that：
The embodiment of the present application provides a kind of power drive system, and the power drive system can be applied to electric vehicle.
The power drive system includes motor and retarder.The motor includes output shaft, during the axle center of the output shaft is first
Heart line.The retarder includes sun gear, ring gear, double-planetary gear and planet carrier.The sun gear fixation is set in institute
State the periphery of output shaft.The ring gear is coaxial with the sun gear and forms installation space between the sun gear.It is described
Double-planetary gear is set in the installation space.The double-planetary gear include first gear that is coaxial and being fixedly secured to one another and
Second gear.The first gear is engaged with the sun gear, and the second gear is engaged with the ring gear.The planet carrier
Including the first connecting portion, second connecting portion and third interconnecting piece being fixedly secured to one another.The first connecting portion is equipped with towards institute
The axis hole of sun gear is stated, the axis hole, the end of the output shaft are stretched into the end of the output shaft after the sun gear
It is rotatablely connected with the first connecting portion, so that the output shaft supports the row on the direction of vertical first center line
Carrier.The second connecting portion is connected to the side of the sun gear backwards of the first connecting portion, the second connecting portion
It is rotated around first center line.The third interconnecting piece is rotatably connected at the axle center of the second gear.The output shaft
The sun gear is driven to rotate so that the first gear and the second gear are synchronously in the sun gear and the internal tooth
Rotation and revolution simultaneously between circle, the second gear drive the third interconnecting piece to be rotated around first center line so that
The second connecting portion rotation is to drive the vehicle wheel rotation of the electric vehicle.
In the embodiment of the present application, described " axle center " is that " object is around rotation or is contemplated that around rotation
A piece straight line ".The direction that definition is parallel to first center line is axial, is diameter perpendicular to the direction of first center line
To.The output shaft is rotated around first center line.The output shaft drives the sun gear to turn around first center line
It is dynamic, the axle center of the sun gear and first centerline collineation.The axle center of the ring gear and first centerline collineation,
The ring gear does not rotate.The axle center of the first gear and the second gear is the second center line, second center line
It is parallel to first center line.The first gear and the second gear are arranged along second center line.Described first
Gear and the second gear synchronously revolve round the sun around first center line, while the first gear and the second gear are same
Step ground is around the second center line rotation.Since the axis hole of the third interconnecting piece, institute are stretched into the end of the output shaft
The end for stating output shaft is rotatablely connected the axis hole of the third interconnecting piece, therefore the output shaft in the axial direction can be opposite
The third interconnecting piece rotation can support the third to connect on radial (namely direction of vertical first center line)
Portion.Since the first connecting portion of the planet carrier, the second connecting portion and the third interconnecting piece are fixedly secured to one another,
Therefore the output shaft can support the planet carrier radially.Since the second connecting portion turns around first center line
It is dynamic, therefore the movement locus of the planet carrier is also to be rotated around first center line.The second gear is around described first
Center line rotate when, drive the third interconnecting piece rotate around first center line, the steering of the third interconnecting piece and turn
Speed is turned to respectively with the revolution of the second gear and revolution rotating speed is identical.The second connecting portion and the third interconnecting piece are same
Step rotation, the steering of the second connecting portion and rotating speed also turn to and revolve round the sun with the revolution of the second gear respectively rotating speed phase
Together.The second connecting portion is rotated around first center line so that the electric vehicle can be driven by stating second connecting portion
Vehicle wheel rotation.Since the third interconnecting piece is rotatably connected at the axle center of the second gear, the second gear meeting
It is rotated relative to the third interconnecting piece due to its rotation acts.
The reduction ratio i calculation formula of power drive system described in the embodiment of the present application are：
Wherein, Z is the number of teeth of the sun gear；Z is the number of teeth of the ring gear；ZcDescribed in the double-planetary gear
The number of teeth of first gear；ZdFor the number of teeth of the second gear of the double-planetary gear.By reduction ratio i calculation formula it is found that
Power drive system described in the present embodiment can be by increasing Zc/ZdSize promote the reduction ratio of the power drive system,
Increase the gear ratio of the first gear and the second gear, need not unreasonably increase institute to increase reduction ratio
It states the number of teeth of ring gear or reduces the number of teeth of the sun gear so that the radial dimension of the retarder meets installation space limitation
It is required that and structural stability it is preferable, it is small that the reduction ratio of the power drive system promotes difficulty.
The axis hole, the institute of the motor are stretched into after passing through the sun gear due to the end of the output shaft
State output shaft and be directly protruding into the retarder to realize that power transmits and structural support so that the motor and the retarder it
Between cooperation it is more compact, the overall volume smaller of the power drive system, so as to meet electric vehicle well
Installation space limitation requires.The output shaft also improves the radial structure support of the planet carrier structure of the retarder
Stability so that the power drive system high-speed overload operating mode underdrive is steady, vibration noise is small.
Power drive system described in the embodiment of the present application can be used for sending the driving motor power of electric vehicle to constant speed
Universal joint drive spindle assembly.Power drive system described in the embodiment of the present application can also be used for wheel side or the wheel hub motor of electric vehicle
Power assembly system.
Optionally, it is fixedly connected by spline between the output shaft and the sun gear so that the output shaft and institute
The power transmission stated between sun gear is steady, and the load that can be transmitted is larger.Certainly, in other embodiments, can also pass through
The modes such as key connection or welding are fixedly connected with the output shaft and the sun gear.Alternatively, the output shaft can be integrally formed
With the sun gear, sun wheel shaft is formed.
Optionally, internal spline is formed in the second connecting portion.The second connecting portion can be fixedly connected by spline
Fast universal joint drive spindle assembly then drives the vehicle wheel rotation of electric vehicle by drive shaft assembly.Alternatively, second connection
Portion directly can connect wheel by shaft, and the second connecting portion rotation is to drive vehicle wheel rotation.In another embodiment,
The second connecting portion can form ring flange, to pass through flanged joint to drive shaft assembly.
Optionally, the first gear and the second gear of the double-planetary gear are integrally formed.Alternatively, described
One gear and the second gear are seperated, and the first gear and the second gear are by the side such as being keyed or welding
Formula is fixedly secured to one another.
Optionally, it is connected by bearing between the third interconnecting piece and the second gear, the BEARING SHAFT of the bearing
Line and second centerline collineation.The bearing can connect also cross the first gear, the second gear and the third
Socket part, to which the power of the double-planetary gear is preferably transferred to the planet carrier.
Optionally, it is connected by bearing between the peripheral side of the end of the output shaft and the inner circumferential side of the axis hole, it should
The bearing axis of bearing and first centerline collineation, to make to be formed between the first connecting portion and the output shaft
Rotation and supporting each other radially each other in axial direction.
In one embodiment, the retarder further includes idle running sun gear, and the idle running sun gear rotation is set in
The periphery of the first connecting portion, the idle running sun gear are engaged with the second gear.
In the present embodiment, the first connecting portion can carry out the double-planetary gear by the idle running sun gear
Radial support further increases the structural stability of the retarder so that work of the power drive system in high-speed overload
Under condition, stable drive, vibration noise is small.
It is understood that the output shaft is in the first gear by the sun gear to the double-planetary gear
While carrying out radial support and power transmission, the first connecting portion and the idle running sun gear are also passed sequentially through to described double
The second gear for joining planetary gear carries out radial support, and the output shaft has carried out radial support to the planet carrier,
So that the rotational action between the sun gear and the double-planetary gear, between the double-planetary gear and the planet carrier is flat
Surely, reliably, the power drive system stable drive, power output are in stable condition and vibration noise is small.
Optionally, connected by bearing between the peripheral side of the first connecting portion and the inner circumferential side of the idle running sun gear
It connects, the bearing axis of the bearing and first centerline collineation, to make the first connecting portion and the idle running sun
Rotation and the supporting each other radially each other in axial direction are formed between wheel.
Optionally, the idle running sun gear first connecting portion relatively described in the axial direction is fixed.It can be in first connection
Positioning step is formed on the peripheral side in portion, a side end face of the idle running sun gear abuts the positioning step, to realize axial direction
Positioning.
In one embodiment, the quantity of the double-planetary gear is multiple, and multiple double-planetary gears are described
It uniformly arranges in the circumferential direction of sun gear.At this point, multiple double-planetary gears are equably rotationally connected with the third interconnecting piece
Circumferential direction, multiple double-planetary gears are equally spacedly connected between the sun gear and the planet carrier.
In the present embodiment, the sun gear is engaged with multiple double-planetary gears simultaneously so that power is multiple
The double-planetary gear uniform divided flows, then multiple double-planetary gears drive the planet carrier to rotate simultaneously so that power
Final interflow is exported to the planet carrier and by the planet carrier, therefore the retarder can realize high-power transmission, into one
Step meets at this stage and requirement of the following electric vehicle to the heavy duty of power drive system.
It should be understood that multiple double-planetary gears be equally spacedly connected to the sun gear and the planet carrier it
Between, the stability and bearing capacity of retarder transmission can be improved so that the power drive system stable drive, can
It leans on.
In one embodiment, the number of teeth of the first gear is more than the number of teeth of the second gear.First tooth
The modulus of wheel is identical as the modulus of the second gear, then the reference diameter of the first gear is more than the second gear
Reference diameter.
In the present embodiment, since the number of teeth of the first gear is more than the number of teeth of the second gear, Zc/Zd
The reduction ratio i of ＞ 1, the retarder of the power drive system are bigger than the reduction ratio range of the retarder of the prior art.The application
The range of the reduction ratio i of power drive system described in embodiment can reach 6~15 or so, and the rotating speed of the output shaft can reach
20000r/min or more, meet at this stage and the following electric vehicle to the big retarding of power drive system, when high speed is wanted
It asks.
In one embodiment, the motor further includes electric machine casing, and the retarder further includes reducer shell, institute
It states electric machine casing and the reducer shell is connected to the opposite sides of the ring gear, velocity-reducing chamber is set out to enclose jointly.
The reducer shell can be fixedly connected with a side end face of the ring gear by fastener.The electric machine casing
It can be fixedly connected by fastener with another side end face of the ring gear.The connection of the reducer shell and the ring gear
Mode and the electric machine casing are identical as the connection type of the ring gear, are conducive to the peace for facilitating the power drive system
Dress, dismounting and exchange.Certainly, in other embodiments, connection type and institute of the reducer shell with the ring gear
The connection type for stating electric machine casing and the ring gear can also be different.
The fastener includes but not limited to bolt, screw etc..Certainly, in other embodiments, the reducing gearbox
Body and a side end face of the ring gear can be also fixedly connected by the modes such as being keyed or welding.The electric machine casing and institute
Stating another side end face of ring gear can be also fixedly connected by the modes such as being keyed or welding.
The electric machine casing is equipped with first through hole, and the output shaft stretches into the velocity-reducing chamber and rotation from the first through hole
Connect the electric machine casing.Bearing is set between the peripheral side of the output shaft and the hole wall of the first through hole, the bearing
Bearing axis and first centerline collineation, to enable the output shaft first through hole relatively described in the axial direction to turn
It is dynamic, and supported radially by the first through hole.
The reducer shell is equipped with the second through-hole, and the planet carrier is contained in the velocity-reducing chamber, the second connecting portion
The velocity-reducing chamber and the rotation connection reducer shell are stretched out from second through-hole.The peripheral side of the second connecting portion with
Bearing is set between the hole wall of second through-hole, the bearing axis of the bearing and first centerline collineation, to make
The second connecting portion is able to rotate relative to second through-hole in the axial direction, and is supported radially by second through-hole.
Optionally, the power drive system further includes first seal and second seal, and the first seal is close
It is encapsulated between the hole wall of the first through hole and the output shaft, the second seal is sealed in the hole wall of second through-hole
Between the second connecting portion.
Optionally, the power drive system is equipped with the fuel feed hole and oil outlet for being connected to the velocity-reducing chamber, the fuel feed hole
Set on the electric machine casing or the reducer shell, the oil outlet is set to the electric machine casing or the reducer shell.
The power drive system realizes lubrication and refrigerating function using oil spout pump mode so that the component being set in the velocity-reducing chamber
(including the part output shaft, the sun gear, the idle running sun gear, the described planet carrier of the double-planetary gear and part)
Lubrication and cooling are abundant, are conducive to the functional reliability for ensureing the power drive system, improve the power drive system
Service life.
In one embodiment, the motor further includes stator mount, stator and rotor.The stator mount connects
It is connected to side of the electric machine casing far from the ring gear, motor cavity is set out to enclose jointly.The stator mount with it is described
It can be fixedly connected by modes such as fastener connection, key connection or welding between electric machine casing.The stator is contained in described
The motor cavity and relatively described stator mount is fixed.The rotor is set in the stator interior, shape at the axle center of the rotor
At the output shaft.
It in the present embodiment, can be by the reducer shell, the planet carrier, the idle running sun gear, the internal tooth
Circle and the double-planetary gear are assembled into the first module, and the electric machine casing, the sun gear and the rotor are assembled into the
Two modules, the third module that the stator mount, the stator are assembled into.First module, second module and
The composition of the third module is clear, and independent assembling procedure is simple.Meanwhile first module, second module and described
The module end face interface of third module can be set to uniform interface (such as fastener connection, welding or key connection), to convenient
Dismounting between module and exchange.So the power drive system has the modularization of height and integrated, institute can be reduced
State space occupancy, dismounting and the maintenance cost of power drive system in automobiles.
Optionally, the end wall of the stator mount is equipped with support slot, is formed backwards to described defeated at the axle center of the rotor
The support shaft of shaft, the support shaft are rotatablely connected the support slot.Namely the opposite both ends of the rotor be respectively formed it is described
Output shaft and the support shaft.The electric machine casing forms an installing port, the stator mount from the installing port install to
The end wall of the electric machine casing, the stator mount closes the installing port.
It is connected by bearing between the peripheral side of the support shaft and the inner circumferential side of the support slot, the bearing axis of the bearing
Heart line and first centerline collineation, to enable the support shaft to be rotated in the axial direction relative to the support slot, and
Radially supported by the support slot.
In one embodiment, the stator mount further includes the support extended from the end wall to the motor cavity
Wall, interference fit connection and formation liquid cooling channel between the peripheral side of the supporting walls and the inner circumferential side of the electric machine casing.Institute
It can be spiral channel to state liquid cooling channel.It can be to component (including the support in the motor cavity by the liquid cooling channel
Wall, the stator and the rotor) it is cooled down, be conducive to the functional reliability for ensureing the power drive system, improve
The service life of the power drive system.
Optionally, the stator is fixed on the inner circumferential side of the supporting walls.The stator can be with the inner circumferential of the supporting walls
Side is fixedly connected by interference fit.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of power drive system provided by the embodiments of the present application.
Fig. 2 is the optical cable of power drive system shown in Fig. 1.
Fig. 3 is the schematic diagram that power drive system shown in Fig. 1 is applied to electric vehicle.
Fig. 4 be IV in Fig. 1 at structure enlarged diagram.
Fig. 5 is the modular structural schematic diagram of power drive system shown in Fig. 1.
Specific implementation mode
The embodiment of the present application is described with reference to the attached drawing in the embodiment of the present application.
Also referring to Fig. 1 to Fig. 4, the embodiment of the present application provides a kind of power drive system 100, the power transmission
System 100 can be applied to electric vehicle 200.The power drive system 100 includes motor 100a and retarder 100b.The electricity
Machine 100a includes output shaft 1, and the axle center of the output shaft 1 is the first center line 101.The retarder 100b include sun gear 2,
Ring gear 3, double-planetary gear 4 and planet carrier 5.The sun gear 2 fixes the periphery for being set in the output shaft 1.In described
Gear ring 3 is coaxial with the sun gear 2 and forms installation space between the sun gear 2.The double-planetary gear 4 is set to described
In installation space.The double-planetary gear 4 includes first gear 41 and second gear 42 that be coaxial and being fixedly secured to one another.It is described
First gear 41 is engaged with the sun gear 2, and the second gear 42 is engaged with the ring gear 3.The planet carrier 5 includes that
This first connecting portion 51 being fixedly connected, second connecting portion 52 and third interconnecting piece 53.The first connecting portion 51 is equipped with direction
The axis hole 531, institute are stretched into the end 102 of the axis hole 531 of the sun gear 2, the output shaft 1 after the sun gear 2
The end 102 and the first connecting portion 51 for stating output shaft 1 are rotatablely connected, so that the output shaft 1 is in vertical described first
The planet carrier 5 is supported on the direction of heart line 101.The second connecting portion 52 is connected to the institute backwards of the first connecting portion 51
The side of sun gear 2 is stated, the second connecting portion 52 is rotated around first center line 101.The third interconnecting piece 53 rotates
It is connected at the axle center of the second gear 42.The output shaft 1 drives the sun gear 2 to rotate so that the first gear
41 and the second gear 42 synchronously between the sun gear 2 and the ring gear 3 simultaneously rotation and revolution, described second
Gear 42 drives the third interconnecting piece 53 to be rotated around first center line 101 so that the second connecting portion 52 rotation with
The wheel 201 of the electric vehicle 200 is driven to rotate.
In the embodiment of the present application, described " axle center " is that " object is around rotation or is contemplated that around rotation
A piece straight line ".The direction that definition is parallel to first center line 101 is axial, perpendicular to the side of first center line 101
To for radial direction.The output shaft 1 is rotated around first center line 101.The output shaft 1 drives the sun gear 2 around described
First center line 101 rotates, and the axle center of the sun gear 2 is conllinear with first center line 101.The axle center of the ring gear 3
Conllinear with first center line 101, the ring gear 3 does not rotate.The axis of the first gear 41 and the second gear 42
The heart is the second center line 401, and second center line 401 is parallel to first center line 101.The first gear 41 and institute
Second gear 42 is stated to arrange along second center line 401.The first gear 41 and the second gear 42 are synchronously around institute
The revolution of the first center line 101 is stated, while the first gear 41 and the second gear 42 are synchronously around second center line
401 rotations.Since the axis hole 531 of the third interconnecting piece 53, the output shaft 1 are stretched into the end 102 of the output shaft 1
End 102 be rotatablely connected the axis hole 531 of the third interconnecting piece 53, therefore the output shaft 1 in the axial direction being capable of phase
The third interconnecting piece 53 is rotated, can be supported on radial (namely direction of vertical first center line 101) described
Third interconnecting piece 53.Since the first connecting portion 51, the second connecting portion 52 and the third of the planet carrier 5 connect
Portion 53 is fixedly secured to one another, therefore the output shaft 1 can support the planet carrier 5 radially.Due to second connection
Portion 52 is rotated around first center line 101, therefore the movement locus of the planet carrier 5 is also around first center line 101
Rotation.When the second gear 42 is rotated around first center line 101, drive the third interconnecting piece 53 around described first
The rotation of center line 101, the steering of the third interconnecting piece 53 and rotating speed are turned to respectively with the revolution of the second gear 42 and public affairs
Speed of walking around is identical.The second connecting portion 52 is rotated synchronously with the third interconnecting piece 53, the steering of the second connecting portion 52
The rotating speed that also turns to and revolve round the sun with the revolution of the second gear 42 respectively with rotating speed is identical.The second connecting portion 52 is around described
One center line 101 rotates so that stating second connecting portion 52 can drive the wheel 201 of the electric vehicle 200 to rotate.By institute
It states third interconnecting piece 53 to be rotatably connected at the axle center of the second gear 42, therefore the second gear 42 can be because of its autorotation
Make and is rotated relative to the third interconnecting piece 53.
The reduction ratio i calculation formula of power drive system 100 described in the embodiment of the present application are：
Wherein, ZaFor the number of teeth of the sun gear 2；ZbFor the number of teeth of the ring gear 3；ZcFor the double-planetary gear 4
The number of teeth of the first gear 41；ZdFor the number of teeth of the second gear 42 of the double-planetary gear 4.It is calculated by reduction ratio i
Formula is it is found that power drive system 100 described in the present embodiment can be by increasing Zc/ZdSize promote the powertrain
The reduction ratio of system 100, namely increase the gear ratio of the first gear 41 and the second gear 42, it need not subtract to increase
Speed ratio and unreasonably increase the number of teeth of the ring gear 3 or reduce the number of teeth of the sun gear 2 so that the retarder 100b
Radial dimension meet installation space limitation require and structural stability it is preferable, the reduction ratio of the power drive system 100 carries
It is small to rise difficulty.The axis hole 531, institute are stretched into after passing through the sun gear 2 due to the end 102 of the output shaft 1
The output shaft 1 for stating motor 100a is directly protruding into the retarder 100b to realize power transmission and structural support so that institute
The cooperation stated between motor 100a and the retarder 100b is more compact, and the overall volume of the power drive system 100 is more
Small, the installation space so as to meet electric vehicle well, which limits, to be required.Diameter of the output shaft 1 to the planet carrier 5
The structural stability of the retarder 100b is also improved to structural support so that the power drive system 100 is in high speed weight
The operating mode underdrive of load is steady, vibration noise is small.
Power drive system 100 described in the embodiment of the present application can be used for transmitting the driving motor power of electric vehicle 200
To constant velocity universal joint drive spindle assembly.Power drive system 100 described in the embodiment of the present application can also be used for the wheel of electric vehicle 200
The power assembly system of side or wheel hub motor.
Optionally, be fixedly connected by spline between the output shaft 1 and the sun gear 2 so that the output shaft 1 with
Power transmission between the sun gear 2 is steady, and the load that can be transmitted is larger.Certainly, in other embodiments, can also lead to
It crosses the modes such as key connection or welding and is fixedly connected with the output shaft 1 and the sun gear 2.Alternatively, can be integrally formed described defeated
Shaft 1 and the sun gear 2 form sun wheel shaft.
Optionally, internal spline is formed in the second connecting portion 52.The second connecting portion 52 can be fixed by spline to be connected
Constant velocity universal joint drive spindle assembly is connect, then drives the wheel 201 of electric vehicle 200 to rotate by drive shaft assembly.Alternatively, institute
State second connecting portion 52 directly can connect wheel 201 by shaft, and the rotation of the second connecting portion 52 is with 201 turns of motor car wheel of band
It is dynamic.In another embodiment, the second connecting portion 52 can form ring flange, to total to drive shaft by flanged joint
At.
Optionally, the first gear 41 and the second gear 42 of the double-planetary gear 4 are integrally formed.Alternatively,
The first gear 41 and the second gear 42 are seperated, and the first gear 41 and the second gear 42 are connected by key
It the modes such as connects or welds to be fixedly secured to one another.
Optionally, it is connected by bearing 61 between the third interconnecting piece 53 and the second gear 42, the bearing 61
Bearing axis is conllinear with second center line 401.The bearing 61 can be also cross the first gear 41, second tooth
Wheel 42 and the third interconnecting piece 53, to which the power of the double-planetary gear 4 is preferably transferred to the planet carrier 5.
Optionally, pass through bearing between the peripheral side and the inner circumferential side of the axis hole 531 of the end 102 of the output shaft 1
62 connections, the bearing axis of the bearing 62 is conllinear with first center line 101, to make the first connecting portion 51 and institute
State the rotation each other formed between output shaft 1 in axial direction and supporting each other radially.
Also referring to Fig. 1, Fig. 2 and Fig. 4, as a kind of alternative embodiment, the retarder 100b further includes idle running
Sun gear 7, the idle running sun gear 7, which rotates, is set in the periphery of the first connecting portion 51, the idle running sun gear 7 with it is described
Second gear 42 engages.
In the present embodiment, the first connecting portion 51 can by the idle running sun gear 7 to the double-planetary gear 4 into
Row radial support further increases the structural stability of the retarder 100b so that the power drive system 100 is in high speed
Under the operating mode of heavy duty, stable drive, vibration noise is small.
It is understood that the output shaft 1 by the sun gear 2 to the double-planetary gear 4 described first
While gear 41 carries out radial support and power transmission, the first connecting portion 51 and the idle running sun gear are also passed sequentially through
The second gear 42 of 7 pairs of double-planetary gears 4 carries out radial support, and the output shaft 1 to the planet carrier 5 into
Radial support is gone so that between the sun gear 2 and the double-planetary gear 4, the double-planetary gear 4 and the planet carrier
Rotational action between 5 is steady, reliable, and 100 stable drive of the power drive system, power output are in stable condition and vibration is made an uproar
Sound is small.
Optionally, pass through bearing between the peripheral side of the first connecting portion 51 and the inner circumferential side of the idle running sun gear 7
63 connections, the bearing axis of the bearing 63 is conllinear with first center line 101, to make the first connecting portion 51 and institute
It states and forms rotation and supporting each other radially each other in axial direction between idle running sun gear 7.
Optionally, the first connecting portion 51 relatively described in the axial direction of the idle running sun gear 7 is fixed.It can connect described first
Positioning step 532 is formed on the peripheral side of socket part 51, a side end face of the idle running sun gear 7 abuts the positioning step 532,
To realize axially position.
Also referring to Fig. 1, Fig. 2 and Fig. 4, as a kind of alternative embodiment, the quantity of the double-planetary gear 4 is more
A, multiple double-planetary gears 4 are uniformly arranged in the circumferential direction of the sun gear 2.At this point, multiple double-planetary gears 4
It is equably rotationally connected with the circumferential direction of the third interconnecting piece 53, multiple double-planetary gears 4 are equally spacedly connected to described
Between sun gear 2 and the planet carrier 5.
In the present embodiment, the sun gear 2 is engaged with multiple double-planetary gears 4 simultaneously so that power is multiple
4 uniform divided flows of the double-planetary gear, then multiple double-planetary gears 4 drive the planet carrier 5 to rotate simultaneously so that work(
Finally interflow exports rate to the planet carrier 5 and by the planet carrier 5, therefore the retarder 100b can realize high-power biography
It is dynamic, further meet at this stage and requirement of the following electric vehicle to the heavy duty of power drive system 100.
It should be understood that multiple double-planetary gears 4 are equally spacedly connected to the sun gear 2 and the planet carrier 5
Between, the stability and bearing capacity of the retarder 100b transmissions can be improved so that the power drive system 100 is driven
Steadily, reliably.
Also referring to Fig. 1 and Fig. 2, as a kind of alternative embodiment, the number of teeth of the first gear 41 is more than described the
The number of teeth of two gears 42.The modulus of the first gear 41 is identical as the modulus of the second gear 42, then the first gear
41 reference diameter is more than the reference diameter of the second gear 42.
In the present embodiment, since the number of teeth of the first gear 41 is more than the number of teeth of the second gear 42, Zc/
ZdReduction ratio ranges of the reduction ratio i of ＞ 1, the retarder 100b of the power drive system 100 than the retarder of the prior art
Greatly.The range of the reduction ratio i of power drive system 100 described in the embodiment of the present application can reach 6~15 or so, the output shaft
1 rotating speed can reach 20000r/min or more, meets at this stage and the following electric vehicle is to the big retarding of power drive system
The when requirement of high speed.
Also referring to Fig. 1, Fig. 2 and Fig. 4, as a kind of alternative embodiment, the motor 100a further includes motor casing
Body 8, the retarder 100b further include reducer shell 9, and the electric machine casing 8 and the reducer shell 9 are connected to
The opposite sides of the ring gear 3 sets out velocity-reducing chamber 10 to enclose jointly.
The reducer shell 9 can be fixedly connected with a side end face of the ring gear 3 by fastener.The motor casing
Body 8 can be fixedly connected with another side end face of the ring gear 3 by fastener.The reducer shell 9 and the ring gear 3
Connection type and the electric machine casing 8 it is identical as the connection type of the ring gear 3, be conducive to facilitate the powertrain
Installation, dismounting and the exchange of system 100.Certainly, in other embodiments, the company of the reducer shell 9 and the ring gear 3
It connects mode and the electric machine casing 8 and the connection type of the ring gear 3 can also be different.
The fastener includes but not limited to bolt, screw etc..Certainly, in other embodiments, the reducing gearbox
Body 9 and a side end face of the ring gear 3 can be also fixedly connected by the modes such as being keyed or welding.The electric machine casing 8
It can be also fixedly connected by the modes such as being keyed or welding with another side end face of the ring gear 3.
The electric machine casing 8 is equipped with first through hole 81, and the output shaft 1 stretches into the velocity-reducing chamber from the first through hole 81
10 and the rotation connection electric machine casing 8.Axis is set between the peripheral side of the output shaft 1 and the hole wall of the first through hole 81
64 are held, the bearing axis of the bearing 64 is conllinear with first center line 101, to enable the output shaft 1 in axial direction
On rotated relative to the first through hole 81, and supported radially by the first through hole 81.
The reducer shell 9 is equipped with the second through-hole 91, and the planet carrier 5 is contained in the velocity-reducing chamber 10, and described second
Interconnecting piece 52 stretches out the velocity-reducing chamber 10 from second through-hole 91 and is rotatablely connected the reducer shell 9.Described second connects
Between the peripheral side of socket part 52 and the hole wall of second through-hole 91 be arranged bearing 65, the bearing axis of the bearing 65 with it is described
First center line 101 is conllinear, to enable the second connecting portion 52 to be rotated in the axial direction relative to second through-hole 91, and
It is supported radially by second through-hole 91.
At this point, the sun gear 2, the idle running sun gear 7 and the double-planetary gear 4 are also contained in the velocity-reducing chamber
10。
Optionally, the power drive system 100 further includes first seal 111 and second seal 112, and described first
Sealing element 111 is sealed between the hole wall of the first through hole 81 and the output shaft 1, and the second seal 112 is sealed in
Between the hole wall and the second connecting portion 52 of second through-hole 91.
Optionally, the power drive system 100 is equipped with the fuel feed hole 121 and oil outlet 122 for being connected to the velocity-reducing chamber 10,
The fuel feed hole 121 is set to the electric machine casing 8 or the reducer shell 9, and the oil outlet 122 is set to the electric machine casing
8 or described reducer shells 9.The power drive system 100 realizes lubrication and refrigerating function using oil spout pump mode so that sets
It is (including the part output shaft 1, the sun gear 2, the idle running sun gear 7, described double in the component in the velocity-reducing chamber 10
Join planetary gear 4 and the part planet carrier 5) lubrication and cooling abundant, be conducive to the work for ensureing the power drive system 100
Reliability improves the service life of the power drive system 100.
Also referring to Fig. 1, Fig. 2, Fig. 4 and Fig. 5, as a kind of alternative embodiment, the motor 100a further includes fixed
Sub- mounting bracket 13, stator 14 and rotor 15.The stator mount 13 is connected to the electric machine casing 8 far from the ring gear 3
Side, set out motor cavity 16 to enclose jointly.It can be connected by fastener between the stator mount 13 and the electric machine casing 8
It the modes such as connects, be keyed or weld to be fixedly connected.The stator 14 is contained in the motor cavity 16 and the relatively described stator peace
Shelve 13 fixations.The rotor 15 is set in inside the stator 14, and the output shaft 1 is formed at the axle center of the rotor 15.
It in the present embodiment, can be by the reducer shell 9, the planet carrier 5, the idle running sun gear 7, the internal tooth
Circle 3 and the double-planetary gear 4 are assembled into the first module 1001, by the electric machine casing 8, the sun gear 2 and the rotor
15 are assembled into the second module 1002, the third module 1003 that the stator mount 13, the stator 14 are assembled into.Described
The composition of one module 1001, second module 1002 and the third module 1003 is clear, and independent assembling procedure is simple.Together
When, the module end face interface of first module 1001, second module 1002 and the third module 1003 can be set to
Uniform interface (such as fastener connection, welding or key connection), to facilitate the dismounting and exchange between module.So described
Power drive system 100 has the modularization of height and integrated, can reduce the power drive system 100 in automobiles
Space occupancy, dismounting and maintenance cost.
Optionally, the end wall 131 of the stator mount 13 is equipped with support slot 132, is formed at the axle center of the rotor 15
Backwards to the support shaft 151 of the output shaft 1, the support shaft 151 is rotatablely connected the support slot 132.Namely the rotor 15
Opposite both ends are respectively formed the output shaft 1 and the support shaft 151.The electric machine casing 8 forms an installing port, described fixed
Sub- mounting bracket 13 is installed from the installing port to the electric machine casing 8, and the end wall 131 of the stator mount 13 closes institute
State installing port.
It is connected by bearing 66 between the peripheral side of the support shaft 151 and the inner circumferential side of the support slot 132, the bearing
66 bearing axis is conllinear with first center line 101, to keep the support shaft 151 relatively described in the axial direction
Support slot 132 rotates, and is supported radially by the support slot 132.
Also referring to Fig. 1 and Fig. 5, as a kind of alternative embodiment, the stator mount 13 further includes from the end
The supporting walls 132 that wall 131 extends to the motor cavity 16, the inner circumferential of the peripheral side of the supporting walls 132 and the electric machine casing 8
Interference fit connection and formation liquid cooling channel 17 between side.The liquid cooling channel 17 can be spiral channel.
It in the present embodiment, can be to component (including the support in the motor cavity 16 by the liquid cooling channel 17
Wall 132, the stator 14 and the rotor 15) it is cooled down, be conducive to the reliable operation for ensureing the power drive system 100
Property, improve the service life of the power drive system 100.
Optionally, the stator 14 is fixed on the inner circumferential side of the supporting walls 132.The stator 14 can be with the supporting walls
132 inner circumferential side is fixedly connected by interference fit.
Claims (10)
1. a kind of power drive system is applied to electric vehicle, which is characterized in that the power drive system includes motor and subtracts
The axle center of fast device, the output shaft of the motor is the first center line, and the retarder includes：
Sun gear, the fixed periphery for being set in the output shaft；
Ring gear, it is coaxial with the sun gear and form installation space between the sun gear；
Double-planetary gear is set in the installation space, and the double-planetary gear includes first gear that is coaxial and being fixedly connected
And second gear, the first gear are engaged with the sun gear, the second gear is engaged with the ring gear；And
Planet carrier, including the first connecting portion, second connecting portion and the third interconnecting piece that are fixedly secured to one another, the first connecting portion
Equipped with the axis hole towards the sun gear, the axis hole is stretched into the end of the output shaft after the sun gear, described defeated
The end of shaft is rotatablely connected with the first connecting portion, so that the output shaft is on the direction of vertical first center line
The planet carrier is supported, the second connecting portion is connected to the side of the sun gear backwards of the first connecting portion, described
Second connecting portion is rotated around first center line, and the third interconnecting piece is rotatably connected at the axle center of the second gear；
The output shaft drives the sun gear rotation so that the first gear and the second gear synchronously it is described too
Rotation and revolution simultaneously between sun wheel and the ring gear, the second gear drive the third interconnecting piece in described first
Heart line rotates so that the second connecting portion rotation is to drive the vehicle wheel rotation of the electric vehicle.
2. power drive system as described in claim 1, which is characterized in that the peripheral side of the end of the output shaft with it is described
It is connected by bearing between the inner circumferential side of axis hole, the bearing axis of the bearing and the first centerline collineation.
3. power drive system as described in claim 1, which is characterized in that the retarder further includes idle running sun gear, institute
The periphery that idle running sun gear rotation is set in the first connecting portion is stated, the idle running sun gear is engaged with the second gear.
4. such as claims 1 to 3 any one of them power drive system, which is characterized in that the quantity of the double-planetary gear
To be multiple, multiple double-planetary gears are uniformly arranged in the circumferential direction of the sun gear.
5. such as claims 1 to 3 any one of them power drive system, which is characterized in that the number of teeth of the first gear is more
In the number of teeth of the second gear.
6. such as claims 1 to 3 any one of them power drive system, which is characterized in that the motor further includes motor casing
Body, the retarder further include reducer shell, and the electric machine casing and the reducer shell are connected to the internal tooth
The opposite sides of circle sets out velocity-reducing chamber to enclose jointly；
The electric machine casing is equipped with first through hole, and the output shaft stretches into the velocity-reducing chamber and rotation connection from the first through hole
The electric machine casing；
The reducer shell is equipped with the second through-hole, and the planet carrier is contained in the velocity-reducing chamber, and the second connecting portion is from institute
It states the second through-hole and stretches out the velocity-reducing chamber and the rotation connection reducer shell.
7. power drive system as claimed in claim 6, which is characterized in that the power drive system, which is equipped with described in connection, to be subtracted
The fuel feed hole and oil outlet of fast chamber, the fuel feed hole are set to the electric machine casing or the reducer shell, and the oil outlet is set
In the electric machine casing or the reducer shell.
8. power drive system as claimed in claim 6, which is characterized in that the motor further includes：
Stator mount is connected to side of the electric machine casing far from the ring gear, motor cavity is set out to enclose jointly；
Stator, is contained in the motor cavity and the relatively described stator mount is fixed；And
Rotor is set in the stator interior, forms the output shaft at the axle center of the rotor.
9. power drive system as claimed in claim 8, which is characterized in that the end wall of the stator mount is equipped with support
Slot, forms the support shaft backwards to the output shaft at the axle center of the rotor, and the support shaft is rotatablely connected the support slot.
10. power drive system as claimed in claim 9, which is characterized in that the stator mount further includes from the end
The supporting walls that wall extends to the motor cavity, between the peripheral side of the supporting walls and the inner circumferential side of the electric machine casing interference match
It closes connection and forms liquid cooling channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710105201.1A CN108501672A (en) | 2017-02-25 | 2017-02-25 | Power drive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710105201.1A CN108501672A (en) | 2017-02-25 | 2017-02-25 | Power drive system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108501672A true CN108501672A (en) | 2018-09-07 |
Family
ID=63373054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710105201.1A Pending CN108501672A (en) | 2017-02-25 | 2017-02-25 | Power drive system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108501672A (en) |
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| CN109882557A (en) * | 2019-03-21 | 2019-06-14 | 吉林博承传动***科技有限公司 | A kind of compound planet gear hub reduction gear |
| CN111600431A (en) * | 2019-02-20 | 2020-08-28 | 广东德昌电机有限公司 | Electric oil pump |
| CN111734789A (en) * | 2020-07-06 | 2020-10-02 | 南京清研易为新能源动力有限责任公司 | Single-stage large-speed-ratio tower-type planet row speed reducer |
| WO2020238969A1 (en) | 2019-05-30 | 2020-12-03 | Johnson Electric (Guangdong) Co., Ltd. | Gearbox and driving device using the same |
| CN112128324A (en) * | 2020-10-10 | 2020-12-25 | 吉林大学 | In-wheel two-gear automatic transmission and power-interruption-free gear shifting control method |
| CN113062950A (en) * | 2021-04-30 | 2021-07-02 | 合肥波林新材料股份有限公司 | Novel planetary reduction power unit |
| WO2022082438A1 (en) * | 2020-10-20 | 2022-04-28 | 舍弗勒技术股份两合公司 | Hub driving system |
| CN115085467A (en) * | 2022-08-19 | 2022-09-20 | 中国科学院宁波材料技术与工程研究所 | Integrated motor, driving device and forklift |
| CN116039372A (en) * | 2023-01-28 | 2023-05-02 | 潍坊倍力汽车零部件有限公司 | Axle assembly comprising planetary reducer and electric automobile |
| CN116494743A (en) * | 2023-06-12 | 2023-07-28 | 中国重汽集团济南动力有限公司 | Electric drive axle system and car |
| CN117128291A (en) * | 2023-09-18 | 2023-11-28 | 上汽通用汽车有限公司 | Speed change device and vehicle |
| WO2024032724A1 (en) * | 2022-08-10 | 2024-02-15 | 上海盘毂动力科技股份有限公司 | Electric drive system |
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| CN111600431A (en) * | 2019-02-20 | 2020-08-28 | 广东德昌电机有限公司 | Electric oil pump |
| CN111600431B (en) * | 2019-02-20 | 2023-04-18 | 广东德昌电机有限公司 | Electric oil pump |
| CN109882557A (en) * | 2019-03-21 | 2019-06-14 | 吉林博承传动***科技有限公司 | A kind of compound planet gear hub reduction gear |
| US11649880B2 (en) | 2019-05-30 | 2023-05-16 | Johnson Electric International AG | Gearbox and driving device using the same |
| WO2020238969A1 (en) | 2019-05-30 | 2020-12-03 | Johnson Electric (Guangdong) Co., Ltd. | Gearbox and driving device using the same |
| EP3959457A4 (en) * | 2019-05-30 | 2022-07-06 | Johnson Electric International AG | Gearbox and driving device using the same |
| CN111734789A (en) * | 2020-07-06 | 2020-10-02 | 南京清研易为新能源动力有限责任公司 | Single-stage large-speed-ratio tower-type planet row speed reducer |
| CN112128324A (en) * | 2020-10-10 | 2020-12-25 | 吉林大学 | In-wheel two-gear automatic transmission and power-interruption-free gear shifting control method |
| WO2022082438A1 (en) * | 2020-10-20 | 2022-04-28 | 舍弗勒技术股份两合公司 | Hub driving system |
| CN113062950A (en) * | 2021-04-30 | 2021-07-02 | 合肥波林新材料股份有限公司 | Novel planetary reduction power unit |
| WO2024032724A1 (en) * | 2022-08-10 | 2024-02-15 | 上海盘毂动力科技股份有限公司 | Electric drive system |
| CN115085467A (en) * | 2022-08-19 | 2022-09-20 | 中国科学院宁波材料技术与工程研究所 | Integrated motor, driving device and forklift |
| CN116039372A (en) * | 2023-01-28 | 2023-05-02 | 潍坊倍力汽车零部件有限公司 | Axle assembly comprising planetary reducer and electric automobile |
| CN116494743A (en) * | 2023-06-12 | 2023-07-28 | 中国重汽集团济南动力有限公司 | Electric drive axle system and car |
| CN116494743B (en) * | 2023-06-12 | 2024-04-16 | 中国重汽集团济南动力有限公司 | Electric drive axle system and car |
| CN117128291A (en) * | 2023-09-18 | 2023-11-28 | 上汽通用汽车有限公司 | Speed change device and vehicle |
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