DE102014009313A1 - drive - Google Patents

Abstract

Drive, comprising motor housing, in particular wherein in the motor housing, a rotor is rotatably mounted about its Rotordrehachsrichtung, in particular wherein the motor housing surrounds a stator housing forming a stator at least in an axial region, wherein on the motor housing a cooling channel is formed, which is at least partially bounded by a cover, in particular wherein the cooling channel is delimited by the cover part and by the motor housing, in particular wherein the cover part defines the cooling channel, in particular from the rotor rotational axis, bounded radially outwards and the motor housing delimits the cooling channel radially inward.

Description

The invention relates to a drive.

It is generally known that a drive has an electric motor which drives a transmission and can be fed by an electronic system, in particular an inverter.

The invention is therefore the object of developing a drive, with the highest possible drive power should be providable on the smallest possible space.

According to the invention the object is achieved in the drive according to the features indicated in claim 1.

Important features of the invention in the drive are that it comprises a motor housing,
in particular, wherein a rotor is rotatably mounted about its Rotordrehachsrichtung in the motor housing is,
wherein a cooling channel is formed on the motor housing, which is at least partially delimited by a cover part,
in particular, wherein the cooling channel is delimited by the cover part and by the motor housing,
in particular wherein the cover part, the cooling channel, in particular on the rotor axis of rotation, radially outwardly limited and the motor housing the cooling channel bounded radially inward.

The advantage here is that a covered, so closed, cooling channel on and / or in the outside of the motor housing can be arranged. Thus, a cooling channel can be produced with little effort and in a material-saving manner.

In an advantageous embodiment, the motor housing, in particular with respect to the rotor axis of rotation, has radially projecting flange sections, in particular two axially spaced-apart flange sections,
in particular wherein the flange portions project in those circumferential angular ranges which are not covered by stiffening ribs which connect to one another by the flange portions.
wherein flange portions are arranged at the axial end portions of the motor housing and each have holes through which a screw is performed for screw connection with a further housing part, such as gear housing of the drive or housing part for power electronics of the drive. The advantage here is that load-bearing viable connections with other housings, such as gear housing or housing part for power electronics, are executable.

In an advantageous embodiment of the cooling channel is formed axially through the flange axially, that is in the rotor rotational axis direction, wherein the cover member is disposed axially between the flange portions. The advantage here is that the flow through the flange takes place in the axial direction and thus an outflow of the air flow parallel to the transmission housing wall or directed to the gear housing wall air flow is providable.

In an advantageous embodiment, the cover is clip-connected to the motor housing. The advantage here is that a simple production is possible.

In an advantageous embodiment, the motor housing with the flange sections in one piece, so one piece, running, especially steel. The advantage here is that a material-saving stable housing of the stator is made possible, in which a cooling in a simple and material-saving manner is providable. For this purpose, the corner regions of the flange portions protrude radially beyond the axially arranged between the flange portions of the motor housing. The flange portions are connected by means of stiffening ribs, so that the cover parts cover the spacing area in the circumferential direction. Since the stiffening ribs also protrude radially, the cooling regions thus formed can be covered by the cover parts.

In an advantageous embodiment, the cover is made of plastic. The advantage here is that mass can be saved and a simple production is possible.

In an advantageous embodiment, the outer circumference of the respective flange portion is configured in a square shape with rounded corners, so that the corner regions protrude radially beyond the portion of the motor housing surrounding the stator and arranged axially between the flange portions.
protrude particularly in the circumferentially arranged between the stiffening ribs areas,
wherein the cooling channel is performed axially through one of the corner regions. The advantage here is that a square flange with the transmission or the housing part of the power electronics is providable. Thus, the screw is compared to a compact Rundflanschverbindung resilient because the screw can pass through high forces and reaction moments. Furthermore, the protruding corner areas also allow the implementation of cooling channels.

In an advantageous embodiment, the drive has a driven by an electric motor gearbox, a signal electronics and power electronics,
wherein the electric motor has a rotor with which a fan is rotatably connected,
wherein the air flow sucked by the fan at least also cools the power electronics, in particular in the intake area.

The advantage here is that of an air flow all three drive components, such as transmission, engine and electronics can be heated. In particular, the electronics and the fan-assisted air flow of the engine and the ejected air stream, the transmission can be cooled by the sucked air flow. In this way, effective cooling is achievable.

In an advantageous embodiment of the electric motor between the transmission and the power electronics, in particular the motor housing of the electric motor between the gear housing and a housing part of the power electronics, arranged, wherein the sucked air flow at least partially in the transverse direction to the connecting direction of the transmission and the power electronics runs along cooling fins, in particular along the direction of extension of cooling ribs, which are formed on the line electronics at least partially housing forming surrounding housing portion of a housing part. The advantage here is that a very compact arrangement is reached and the sucked air flow from the transverse direction through a slot can be sucked through, the slot is executed as Lufteinströmöffnung, which is limited to the housing part of the power electronics by means formed on this housing part cooling fins. In this way, the sucked air already absorbs heat from the electronics and the conveyed air

In an advantageous embodiment, the drive has a driven by an electric motor gearbox, a signal electronics and power electronics,
wherein the electric motor has a rotor with which a fan is rotatably connected,
wherein a housing part of the drive has a yoke section, a first housing section and a second housing section,
wherein the first housing portion is spaced from the second housing portion and the yoke portion is connected to the first housing portion and connected to the second housing portion such that the intermediate portion disposed between the first and second housing portion opens into the ambient air,
in particular wherein the housing part, comprising the yoke section, the first and the second housing section, is made in one piece, in particular in one piece,
wherein the first housing section surrounds a fan at least partially housing-forming,
wherein the first housing section has an opening formed as an inflow opening, in particular for an axial air flow sucked by the ventilator, which has a passage through the wall of the housing section and opens into the intermediate area.

The advantage here is that the first housing section the fan room area, including the fan, at least partially limited and the second housing section, the power electronics.

The spacing also avoids or at least reduces thermal mutual influence. The connecting yoke section makes it possible to attach the connection area for supply lines in the transverse direction to the line connecting the transmission and power electronics using a small space. Because on the yoke portion a receiving part with recorded signal electronics can be received. Thus, therefore, a suction of the air in the transverse direction to the connecting direction of power electronics and transmission executable and thus a very compact arrangement can be achieved, since the cooling of the geared motor including electronics by means of the cooling channel is executable.

In an advantageous embodiment, the air flow sucked by the fan cools at least the power electronics. The advantage here is that the intake of the air flow absorbs heat of the electronics. Thus, here the air pressure is not increased for heat absorption but tends to be lowered. In this way, the housing part with lower wall thickness or higher leakage is executable. In addition, a safe removal of heat can be achieved. Because there are Quaisstationär occurring vortex in a simple manner avoidable and thus an effective heat dissipation reached.

In an advantageous embodiment, the second housing section has cooling ribs which extend at least in sections parallel to the air stream flowing in from the fan and / or which are arranged on the side lying opposite the first housing section. The advantage here is that an effective cooling is achievable.

In an advantageous embodiment, the yoke section has one, two or more continuous recesses opening into the intermediate region. The advantage here is that not only the air supply to the fan can be improved but also a drainage for each mounting direction can be achieved.

In an advantageous embodiment is on the first and second housing portion side facing away from the yoke portion, a receiving part connected to the yoke portion, which accommodates a particular arranged in a plastic housing signal electronics. The advantage here is that as close to the power electronics but at a different temperature level, in particular by the means of the receiving part and the plastic housing of the signal electronics caused heat transfer resistance.

In an advantageous embodiment, the motor housing has at least one cooling channel, in particular passes from the fan room area to the transmission, wherein the cooling channel is at least partially limited by a cover. The advantage here is that mass and weight can be saved. Because the cover is made of plastic and is also able to limit an air-filled cooling area, so that no steel is necessary for this.

In an advantageous embodiment, the motor housing made of metal and the cover is made of plastic, in particular wherein the cover is klipsverbunden with the motor housing. The advantage here is that a simple production is executable.

In an advantageous embodiment of the cooling channel leads through a flange portion of the motor housing axially into a cooling area, in particular in a cooling bag, which is bounded by the cover, wherein the flange portion is connected to a corresponding flange portion of the first housing portion, in particular screw-connected. The advantage here is that the flange portion with respect to a stability improved connection can be produced.

In an advantageous embodiment of the cooling channel leads through a further flange portion of the motor housing, in particular in the axial direction, wherein the air flow exiting from the cooling channel is directed to the outer surface of the transmission,
wherein the further flange portion of the motor housing is connected to a corresponding flange portion of the gear housing, in particular screw-connected,
wherein the cooling channel is guided in particular axially through the corresponding flange portion of the transmission housing. The advantage here is that a more effective cooling can be achieved.

In an advantageous embodiment, the receiving part is clipped to the yoke portion, wherein the receiving part is made of metal and the yoke portion made of metal. The advantage here is that two metallic parts are connected in a simple manner and thus a simple production is possible. In addition, the heat can be expanded and thus the heat dissipation by means of the receiving part can be improved.

In an advantageous embodiment, a heat spreader plate is arranged on the inside of the second housing section, on which a power semiconductor is arranged. The advantage here is that the peak temperature can be lowered by the heat can be spread by the heat spreader plate.

In an advantageous embodiment of the yoke portion and the receiving part are integrally formed. The advantage here is that the number of parts can be reduced and thus the production is simplified.

In an advantageous embodiment, a reinforcing rib and a cable guide are formed on the receiving part and / or a recess for passing electrical lines to the stator winding of the stator of the electric motor. The advantage here is that an increased stability can be achieved in a simple manner with little effort and a shaped cable guide in the casting and thus without additional effort is providable, with material can be saved. In addition, the implementation of the lines to the stator by the material-saving recess is executable.

Further advantages emerge from the subclaims. The invention is not limited to the combination of features of the claims. For the skilled person, further meaningful combination options of claims and / or individual claim features and / or features of the description and / or figures, in particular from the task and / or by posing the task by comparison with the prior art task.

The invention will now be explained in more detail with reference to figures:

In the 1 is a cross section through a drive according to the invention shown having a driven by an electric motor transmission, wherein the electric motor is powered by an inverter, wherein the inverter comprises power electronics and signal electronics, wherein the signal electronics in a preferably metallic running receiving part 1 of the drive is received.

In the 2 is shown an oblique view of the drive, wherein the cooling area 18 is not covered.

In the 3 is a plan view of the receiving part 1 shown with remote signal electronics.

In the 4 is an oblique view of the receiving part 1 shown with remote signal electronics.

In the 5 is an air duct 8th represented by the fan room area 19 in the cooling area 18 on the outside of the motor housing 5 leads.

In the 6 is a plan view of the fan housing on the motor housing 5 shown.

In the 7 is in turn the air duct 8th represented by the fan room area 19 in the cooling area 18 on the outside of the motor housing 5 leads, with the stator lamination 12 and the stator windings 11 are shown.

In the 8th is a plan view of the power electronics housing forming surrounding part of the housing part 6 shown, with the invisible air inlet opening 7 in front of the cooling fins 17 So in the direction of the cooling fins 17 lies and the the fan room area 19 housing forming surrounding part of the housing part 6 is cut out.

In 9 is a cover part 90 , which is preferably made of plastic and turbulators on the inside 91 are formed, which is the cooling area 18 covers and thus a cooling channel between the motor housing 5 and cover 90 provides, with the turbulators 91 cause an increase in turbulence and thus an overall lower heat transfer resistance between the stator and ambient air.

In the 10 is an alternative providable cover 90 shown, which is executed without turbulators.

In the 11 the drive is shown in an oblique view, wherein also formed in the motor housing air outlet openings 120 are shown, from which one on the transmission housing 9 directed air flow exits and thus causes cooling.

In the 12 the drive is shown in an oblique view, with the cover parts 90 are hidden.

As shown in the figures, the drive has a gearbox with gear housing 9 on which bearings are accommodated, which support shafts which are non-rotatably connected with toothing parts. The driving stage of the gearbox is rotatable with the rotor 10 an electric motor connected toothing part, in particular pinion driven. The rotor 10 is about a camp 13 in the motor housing 5 and about a camp 3 in the housing part 6 stored, wherein the transmission housing 9 with the motor housing 5 is connected and the motor housing 5 with the housing part 6 ,

In the motor housing 5 is the stator core 12 taken, in which the stator winding 11 is retracted.

At the end remote from the gearbox of the rotor 10 is a fan 20 rotatably with the rotor 10 connected. This fan 20 sucks a stream of air through a round opening 50 through from an air inlet opening 7 at.

This covers the fan 20 in the radial direction, a larger radial distance range of the rotor axis starting than the circular opening 50 , The round opening 50 is as a recess in the wall of the housing part 6 formed and extends in all circumferential angles in the radial direction at least ten times more than in the axial direction. Thus, the sucked air flow enters the fan room area 19 essentially axially from the air inlet opening 7 one.

The air inlet opening 7 is shaped such that the airflow enters substantially at one or more spaced circumferential angular ranges from the radial direction.

The air inlet opening 7 is slit-shaped, so that the air flow in 1 coming in from below and along the cooling fins 17 flows, which at that area of the housing part 6 are arranged, which surrounds the power electronics.

The room area covered by the power electronics overlaps with that of the fan 20 covered room area.

The housing part 6 has a first housing section that covers the fan room area 19 surrounds housing.

The housing part 6 has a second housing portion which surrounds the power electronics, housing forming.

The first and the second housing portion are connected by means of a yoke portion, on which a receiving portion is placed.

The yoke portion, the first housing portion and the second housing portion are integrally, so one piece, running. Preferably, the housing part 6 made of metal, such as aluminum or steel.

The first and second housing sections are axially spaced apart so that the air inlet opening 7 is formed. At the first housing portion and / or at the air inlet opening 7 facing side of the second Housing section are cooling fins 17 shaped so that the outside through the air inlet 7 incoming air along the cooling fins 17 must flow and thus the power electronics cools.

On the inside of the second housing portion is a heat spreader plate 15 arranged, which is thermally conductively connected to the second housing portion. on the from the connection area between heat spreader plate 15 and second housing portion facing away from the Wärmespreizplatte 15 is at least a power semiconductor 14 thermally conductive connected. Thus, the heat of the power electronics to the cooling fins 17 dissipated.

The yoke section has two recesses 2 on which into the air inlet opening 7 open, so that on the one hand also air from that of the air inlet opening 7 flows opposite side and thus also in any design, a drainage takes place, since the air inlet opening 7 opposite to the recesses 2 flows into the area.

The motor housing 5 is with the housing part 6 by means of screws 4 screw-connected.

A substantially axially extending air duct 8th connects the fan room area 19 with the cooling area 18 so that's from the fan 20 Promoted air flow through the air duct in the fan room area 19 flows in, along the motor housing 5 flows along from there through an air outlet opening 120 on the outer surface of the gear housing 9 impinges, so that the air flow generated by the power electronics heat from the cooling fins 17 absorbs heat generated by the stator and finally absorbs heat generated by the transmission and then escapes into the environment.

Preferably, the air outlet openings 120 formed like a nozzle, so executed in the flow direction with a narrowed cross section, so that a faster emerging air flow can be generated.

On the side facing away from the first and second housing portion of the yoke portion is the receiving part 1 connected to the yoke section. The recording part 1 is also metallic. On the side facing away from the yoke portion and the first and the second housing portion side of the receiving part 1 is a housing part 16 , which is preferably designed as a plastic housing part, and surrounds a signal electronics at least partially housing forming.

Thus, on the receiving part 1 a control panel placed, with which the power electronics can be controlled.

In the recording part 1 is a cable guide 30 formed for supply lines and a cable duct 31 , which allows the passage of wires to the stator winding. In addition, on the receiving part 1 reinforcing ribs 32 formed.

The cover parts 90 are preferably made of plastic as injection molded plastic parts. As in 9 shown protrude on the inside of the cover parts 90 shaped turbulators 91 in the cooling area 18 and thus improve the heat dissipation from the stator to the environment.

Alternatively, however, are also cover parts 100 usable without such turbulators.

Both types of cover parts ( 90 . 100 ) are clip-connected to the motor housing 5 ,

Thus, the air flow can flow through, from the respective cover part ( 90 . 100 ) at least partially housing forming surrounded cooling areas 18 provided as channels.

As shown in the figures, such cooling areas are regularly spaced from each other in the circumferential direction.

Transmission, motor and power electronics are substantially coaxial, that is arranged in a line, wherein the motor is arranged axially between the transmission and the power electronics. The air intake takes place in the transverse direction to this axial direction, namely via the air inlet opening 7 and the recesses 2 ,

As in 8th are shown in the circumferential direction eight air channels 8th arranged. In each of the corner areas, between the corners of the cuboid motor housing 5 and the largest radial distance of the stator lamination stack 12 are arranged, are two circumferentially spaced apart air channels 8th educated.

The gearbox 9 has a stepped outwardly projecting flange portion, in which the screw connection with the motor housing 5 is executed.

The air outlet openings 120 occur in the axial direction through these step areas.

The metallic receiving part 1 is by means of clip connection 80 with the housing part 6 connected, which is also metallic.

The recesses 2 open on both sides of the housing part 16 the signal electronics. So they are spaced apart in the transverse direction by means of the signal electronics. In this case, the signal electronics is designed as a control unit, ie with input means and output means.

For connecting the housing part 6 with the motor housing 5 both each have a flange portion 22 on, by which screw can be carried out. Similarly, the engine case 5 and the gearbox 9 correspondingly executed flange sections 22 on. In addition, the mentioned flange sections 22 executed with axially continuous recesses, the parts of the cooling duct from the fan room area 19 through the cooling areas.

Thus, the flange sections protrude 22 , which at the axial end portions of the motor housing 5 are arranged and from the axially between the two flange portions 22 arranged portion of the motor housing, in particular in the corner regions radially out. The flange sections are 22 square, with rounded corners. Axial stiffening ribs 21 connect the flange sections 22 and protrude radially accordingly, in particular according to the flange portions 22 , The stiffening ribs are spaced apart in the circumferential direction, in particular regularly. This spacing area is from the cover parts 90 covered. The motor housing 5 Although the stator also occupies the stator in the spacing regions, it is not so far radially expanded in these spacing regions as in the area of the reinforcing ribs 21 and / or flange sections 22 , Thus, material is saving and it is from the cover parts 90 radially outwardly limited cooling areas 18 created.

The corner areas are therefore used on the one hand for the screw connections and on the other hand for the cooling channels. For producing a respective screw connection, a respective continuous borehole which is suitable for carrying out a screw, in particular a connecting screw, is sufficient.

LIST OF REFERENCE NUMBERS

1

receiving part

2

Recess, in particular suction opening and drainage opening

3

Bearing in the housing part 6

4

screw

5

motor housing

6

Housing part for fan and power electronics

7

Air inlet opening, in particular slot-like air inlet opening

8th

air duct

9

gearbox

10

rotor

11

stator

12

stator lamination

13

Bearing in the motor housing 5

14

Power semiconductor

15

Wärmespreizplatte

16

Housing part, in particular plastic housing part for signal electronics

17

cooling fins

18

cooling area

19

Fan room area

20

Fan

21

stiffening rib

22

flange

30

cable management

31

Cabel Canal

32

reinforcing rib

50

Opening, in particular bore, on inclined surface as inflow opening for fan air flow

80

clip connection

90

cover

91

turbulators

100

cover

120

Air outlet opening

Claims (15)

Drive comprising motor housing, in particular wherein in the motor housing, a rotor rotatably mounted about its Rotordrehachsrichtung is, in particular wherein the motor housing surrounding a stator housing forming at least in an axial region, characterized in that the motor housing, a cooling channel is formed, at least partially by a cover is limited, in particular wherein the cooling channel is limited by the cover and the motor housing, in particular wherein the cover the cooling channel, in particular from the rotor axis of rotation, limited radially outwardly and the motor housing defines the cooling channel radially inward. Drive according to at least one of the preceding claims, characterized in that the motor housing, in particular seen from the rotor axis of rotation, in particular at least in corner regions radially projecting flange sections ( 22 ), in particular two axially spaced flange portions ( 22 ), wherein the axially between the flange sections ( 22 ) arranged portion of the motor housing ( 5 ) axially extending stiffening ribs ( 21 ), which the flange sections ( 22 ), wherein the flange sections ( 22 Are arranged at the axial end portions of the motor housing and each have holes through which a screw is carried out for Screw connection with another housing part, such as gear housing of the drive or housing part for power electronics of the drive. Drive according to at least one of the preceding claims, characterized in that the cooling channel through the flange axially, ie in Rotordrehachsrichtung, is continuously formed, wherein the cover member is disposed axially between the flange portions. Drive according to at least one of the preceding claims, characterized in that the cover part is connected to the motor housing with clips. Drive according to at least one of the preceding claims, characterized in that the motor housing with the flange sections in one piece, so one piece, is executed, in particular made of steel. Drive according to at least one of the preceding claims, characterized in that the cover part is made of plastic. Drive according to at least one of the preceding claims, characterized in that the outer circumference of the respective flange portion is designed square with rounded corners, so that the corner regions radially projecting beyond the stator, axially disposed between the flange portions of the motor housing protrude, in particular in the Protruding circumferential direction between the stiffening ribs regions protrude, wherein the cooling channel is performed axially through one of the corner regions. Drive according to at least one of the preceding claims, characterized in that the drive comprises one of a motor housing having the driven electric motor transmission, a signal electronics and power electronics, wherein the electric motor has a rotor with which a fan is rotatably connected, wherein the from Fan sucked air flow at least the power electronics cools, especially in the intake. Drive according to at least one of the preceding claims, characterized in that the electric motor between the transmission and the power electronics, in particular the motor housing of the electric motor between the gear housing and a housing part of the power electronics is arranged, wherein the sucked air flow at least in sections in the transverse direction to the connecting direction of the transmission and the power electronics runs along cooling ribs, in particular along the direction of extension of cooling ribs, which are formed on the housing electronics of the housing section of a housing part that at least partially encloses the housing. Drive according to at least one of the preceding claims, wherein the drive comprises a transmission driven by an electric motor, a signal electronics and power electronics, wherein the electric motor has a rotor with which a fan is rotatably connected, wherein a housing part of the drive has a yoke section, a first housing section and a second housing section, wherein the first housing portion is spaced from the second housing portion and the yoke portion is connected to the first housing portion and connected to the second housing portion such that the intermediate portion disposed between the first and second housing portion opens into the ambient air, in particular wherein the housing part, comprising the yoke section, the first and the second housing section, is made in one piece, in particular in one piece, wherein the first housing section surrounds a fan at least partially housing-forming, wherein the first housing section has an opening formed as an inflow opening, in particular for an axial air flow sucked by the ventilator, which has a passage through the wall of the housing section and opens into the intermediate area. Drive according to at least one of the preceding claims, characterized in that the air flow sucked by the fan at least cools the power electronics. Drive according to at least one of the preceding claims, characterized in that the second housing section has cooling fins which extend at least in sections parallel to the sucked by the fan, incoming air flow and / or which are arranged on the side opposite the first housing portion opposite side. Drive according to at least one of the preceding claims, characterized the yoke section has one, two or more continuous recesses opening into the intermediate area. Drive according to at least one of the preceding claims, characterized in that on the side facing away from the first and second housing portion of the yoke portion, a receiving part is connected to the yoke portion, which accommodates a particular arranged in a plastic housing signal electronics. Drive according to at least one of the preceding claims, characterized in that the motor housing has at least one cooling channel, in particular passes from the fan room area to the transmission, wherein the cooling channel is at least partially bounded by a cover, and / or that the cooling channel through a flange portion of the motor housing axially passes into a cooling region, in particular in a cooling bag, which is bounded by the cover, wherein the flange is connected to a corresponding flange portion of the first housing portion, in particular screw-connected, and / or that the cooling channel leads through a further flange portion of the motor housing, in particular axial direction, wherein the air flow emerging from the cooling passage is directed to the outer surface of the transmission, wherein the further flange portion of the motor housing is connected to a corresponding flange portion of the transmission housing, i nsbesondere is screw-connected, wherein the cooling channel is guided in particular axially through the corresponding flange portion of the gear housing, and / or that the receiving part is clipped with the yoke portion, wherein the receiving part of metal and the yoke portion is made of metal, and / or that on the inside a heat spreader plate is arranged on the second housing portion, on which a power semiconductor is arranged, and / or that the yoke portion and the receiving part are integrally formed, and / or that on the receiving part a reinforcing rib and a cable guide are formed and / or a recess for performing electrical Leads to the stator winding of the stator of the electric motor.

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