DE102007032131A1 - Rotor carrier for an electric machine and method for its production - Google Patents

Rotor carrier for an electric machine and method for its production

Info

Publication number
DE102007032131A1
DE102007032131A1 DE102007032131A DE102007032131A DE102007032131A1 DE 102007032131 A1 DE102007032131 A1 DE 102007032131A1 DE 102007032131 A DE102007032131 A DE 102007032131A DE 102007032131 A DE102007032131 A DE 102007032131A DE 102007032131 A1 DE102007032131 A1 DE 102007032131A1
Authority
DE
Germany
Prior art keywords
parts
rotor carrier
characterized
wall part
rotor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE102007032131A
Other languages
German (de)
Inventor
Miro Bekavac
Anja Hofmeister
Barlas Turgay
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE102007032131A priority Critical patent/DE102007032131A1/en
Publication of DE102007032131A1 publication Critical patent/DE102007032131A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/28Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures

Abstract

The invention relates to a method for producing a rotor carrier (2) for an electric machine and to a rotor carrier (2) for an electric machine. It is envisaged that the rotor carrier (2) from at least two parts (12, 14, 46, 48) is joined together, which are firmly joined together by friction welding.

Description

  • The The invention relates to a method for producing a rotor carrier for an electric machine according to the The preamble of claim 1 and a rotor carrier according to the Preamble of claim 8.
  • State of the art
  • at Rotors of large-sized electric machines, such as for example of electric machines of hybrid drives of Motor vehicles, the rotor is often hollow Rotor carrier instead of a massive rotor shaft, so that in the interior of the rotor or the rotor carrier space for other components of the electric machine or for components of adjacent components of the hybrid drive, such as a clutch is created. As with smaller ones electric machines, the rotor consists of a lamellar or Rotor laminated core, which is on a cylindrical outer Peripheral surface of the rotor carrier is attached, and a rotor winding or permanent magnets in the grooves the lamella or rotor core are housed. The rotor carrier usually consists of a hollow cylindrical peripheral wall part and a rotatably connected to the peripheral wall part, in outline circular Floor panels. The bottom wall part can either be at a front end be arranged of the peripheral wall part, so that the cup-shaped rotor carrier a cylindrical cavity open on one side in the axial direction encloses, or may be closer to the middle of Be arranged peripheral wall part, so that the double cup-shaped Rotor carrier two cylindrical sides open to opposite sides Encloses cavities. Such integrally formed As a rule rotor armors are usually made by casting or by forming from a solid material and by a subsequent However, in terms of the relatively large space requirement and the relatively high investment costs the facilities required for the production of disadvantage is. Moreover, the known methods do not allow for different parts of the rotor carrier different, on to use materials adapted to the respective requirements.
  • A rotor carrier of the type mentioned is for example from the DE 10 2005 040 771 A1 known.
  • outgoing This is the object of the invention, a method and a rotor carrier of the type mentioned in the effect to improve that a production of the rotor carrier from several, optionally consisting of different materials items is possible.
  • Disclosure of the invention
  • These The object is achieved according to the invention that the rotor carrier from at least two parts joined together is firmly connected by friction welding become.
  • Of the Invention is based on the idea, not the rotor carrier by casting or forming from a solid material and by to produce a subsequent machining, but instead of several items, previously separated by casting, forming, stamping and / or machining Machining have been made and then the assembly of the rotor carrier by Friction welding are firmly connected. Thereby The items can also be made of different materials are manufactured, which optimally to the respective requirements are adapted in different sub-areas of the rotor carrier. For example, one of the parts may be aluminum or an aluminum alloy are manufactured to the rotating mass of the rotor carrier to keep as small as possible while another parts exposed to high loads, made of steel can be.
  • A preferred embodiment of the invention provides that it is at the parts connected by friction welding on the one hand is a hollow cylindrical peripheral wall part of the rotor carrier, on which the lamella or rotor laminated core with the rotor winding is attached, as well as on the other to a bottom and / or intermediate wall part, the the limited by the peripheral wall portion cavity at a front end of the Rotor carrier closes or closer to its center divided into two separate cavities. In In this case eliminates the otherwise required bending radii at the transition between the peripheral wall part and the bottom or intermediate wall part, whereby at the same length and the same diameter of the Rotor a larger space inside the rotor carrier can be provided.
  • According to a further preferred embodiment of the invention, the two parts are rotated during friction welding under mutual pressure in relation to each other about an axis of rotation which corresponds to the axis of rotation of the later rotor. It is on the one hand possible to fix one of the two parts stationary and to put the other of the two parts in rotation and to press against the fixed part. Alternatively, however, one of the parts may also be rotated about the axis of rotation and the other part may be pressed against the rotating part in the axial direction of the axis of rotation, or both parts may be rotated in reverse direction rotated and pressed axially against each other.
  • Preferably be the parts with two opposite ring or circular faces pressed against each other, around at least one of the two parts in the area of these surfaces melt by the resulting frictional heat and when solidifying the molten material butt to weld.
  • however Alternatively, it is also possible, the two parts along two with respect to the rotation axis rotationally symmetrical peripheral surfaces To weld together, by the outside facing peripheral surface of a part of a slightly larger Gives diameter than the inward-facing peripheral surface the other part and then the parts under mutual rotation pressed in the axial direction of the rotation axis against each other. These axial contact pressure of the two parts in the region of their peripheral surfaces then leads to at least one of the parts melted adjacent to the peripheral surface wall area becomes. By softening this wall area approach the parts continue as a result of the sustained axial contact pressure to each other, until the outward-facing peripheral surface completely from the inward facing peripheral surface is surrounded.
  • Brief description of the drawings
  • in the Following is the invention with reference to some shown in the drawing Embodiments explained in more detail. Show it:
  • 1 a schematic perspective view of a rotor carrier of an electric machine;
  • 2 a longitudinal sectional view of the rotor carrier 1 ;
  • 3 an enlarged view of section III 2 ;
  • 4 a schematic perspective view of a slightly different rotor carrier;
  • 5 a longitudinal sectional view of the rotor carrier 4 ;
  • 6 an enlarged view of the section VI 5 ;
  • 7 a longitudinal sectional view of another rotor carrier.
  • embodiments the invention
  • The rotor carrier shown only schematically and simplified in the drawing 2 serve to support a rotor (not shown) of a large-sized electric machine for a hybrid drive of a motor vehicle. The rotor consists in a known manner of one or more lamellae or rotor lamination packages, the rotationally fixed on a cylindrical outer peripheral surface 4 the rotor carrier 2 be attached, as well as a rotor winding or permanent magnets, which are introduced after mounting of the lamella or rotor laminations in receiving grooves of the same or the same.
  • To inside the rotor carrier 2 To create space for other components of the electric machine or for other components of the hybrid drive, such as for clutches, with the help of the rotor arm 2 can be coupled with an output shaft of the electric machine, limit the rotor carrier 2 a cylindrical cavity open on one side in the axial direction 6 ( 1 and 2 ) or two separate cylindrical cavities open in opposite axial directions 8th . 10 ( 3 ).
  • The in the 1 to 3 illustrated rotor carrier 2 consists essentially of a hollow cylindrical peripheral wall part produced in one piece from a metallic material by a casting or forming process 12 , on the outer peripheral surface 4 the rotor is fixed, as well as a produced by a machining process of the same or another metallic material, in outline circular flat bottom wall part 14 that the cavity 6 at a front end of the rotor carrier 2 closes.
  • The bottom wall part 14 is there with a radially outer edge 16 its the peripheral wall part 12 facing front broadside surface 18 against one of the two ends of the peripheral wall part 12 and is along the entire outer edge 16 fixed to the peripheral wall part 12 connected.
  • About the cavity 6 opposite rear broadside surface 20 of the bottom wall part 14 there is a stub shaft 22 over, rigid with the bottom wall part 14 is connected and as well as the peripheral wall part 12 and the bottom wall part 14 coaxial with a rotation axis 24 of the rotor is aligned.
  • The production of the rigid non-rotatable connection between the outer edge 16 of the bottom wall part 14 and the adjacent front end of the peripheral wall part 12 done by friction welding. In this case, the peripheral wall part 12 with one in the cavity 6 introduced, radially expandable clamping device (not shown) fixed to an axial and / or rotational movement of the peripheral wall part 12 to prevent. The over the bottom wall part 14 protruding stub shaft 22 is clamped in an axially movable chuck (not shown) with rotary drive. Subsequently, the chuck is set in rotation and by an axial movement of the chuck of the bottom wall part 14 with the edge 16 the broadside surface 18 against the front end of the peripheral wall part 12 pressed. The during the rotation of the bottom wall part 14 in relation to the peripheral wall part 12 at the contact surface 16 between the two parts 12 . 14 resulting frictional heat causes the metallic material of the peripheral wall part 12 and / or the bottom wall part 14 along the contact surface 16 melts. Once the rotary motion of the bottom wall part 14 is stopped, the molten material cools again, where it solidifies and the bottom wall part 14 rigid with the peripheral wall part 12 combines.
  • To ensure that the weld produced by friction welding allows the transmission of large torques, the outer edge 16 of the bottom wall part 14 and the opposite end face of the peripheral wall part 12 before welding the two parts 12 . 14 with complementary circumferential grooves or ribs 26 . 28 be provided, which have a substantially wedge-shaped cross section, as in 3 shown. These ribs 26 . 28 grab the approach of the two parts 12 . 14 finger-like into one another, which not only leads to an additional centering of the two parts in the region of the weld, but also after the contact of the two parts 12 . 14 a considerable increase in the contact area 16 and as a result of the slope of the ribs 26 . 28 also an increase in the contact pressure and thus the friction forces.
  • As alternatives to a rotation of the bottom wall part 14 with respect to the fixed peripheral wall part 12 can also be the peripheral wall part 12 rotated together with the tensioning device and against the fixed bottom wall part 14 be pressed, or it can both parts 12 . 14 driven in the opposite direction of rotation while being pressed against each other in the axial direction.
  • The in the 4 to 6 illustrated rotor carrier 2 has in addition to a hollow cylindrical peripheral wall part made of metal 12 also a flat, circular, consisting of the same or another metal bottom wall part 14 on, in the vicinity of the one end face of the peripheral wall part 12 but at a small axial distance from its end face 30 rotatably with the peripheral wall part 12 is welded.
  • To the two parts 12 . 14 by friction welding together, here is the outer diameter of the bottom wall part 14 so selected that it is slightly larger than the inner diameter of the peripheral wall part 12 is. Subsequently, the two parts 12 . 14 again coaxial with the axis of rotation 24 aligned, whereupon the bottom wall part 14 around the axis of rotation 24 set in rotation and in the axial direction of the axis of rotation 24 against the adjacent front end of the peripheral wall part 12 is pressed. This is an outermost edge 32 of the bottom wall part 14 at the front end of the peripheral wall part 12 with its inner wall 34 in contact, eliminating the inner wall 34 is melted due to the frictional heat in the region of the contact, provided that the peripheral wall part has a lower melting point. The melting of the inner wall 34 leads together with the on the bottom wall part 14 exerted sustained axial compressive force that the bottom wall part 14 increasingly further into that of the peripheral wall part 12 limited cavity 6 moved in until its outer peripheral surface 38 completely from the peripheral wall part 12 surrounded and its rear broadside 20 at a distance from the face 30 the peripheral wall part 12 is arranged as in 5 and 6 shown. When moving molten metal from the outermost edge 16 displaced, with a greater part of this material due to centrifugal and adhesive forces in a gusset 36 between the inner wall 34 and the broadside surface 18 collects, while a smaller part on the peripheral surface 38 of the bottom wall part 14 over to its rear broadside 20 passes and gets in a corresponding gusset 40 collects. When the rotation of the bottom part 14 stopped in this position, are the two parts 12 . 14 not only along the peripheral surface 38 of the bottom part 14 fused together, but also in the area of the gusset 36 . 40 that the bottom part 14 In addition, hold in the axial direction and provide a firmer connection due to the larger contact surface between the two parts.
  • As with the rotor carrier off 1 and 2 can either the bottom wall part 14 or the peripheral wall part 12 or both parts 12 . 14 are rotated before they are pressed against each other.
  • A combination of referring to the 1 to 3 respectively. 4 to 6 described method is also possible if a bottom wall part 14 is used with a stepped edge (not shown), which after welding in both the radial and in the axial direction against the adjacent front end of the peripheral wall part 12 is applied.
  • The in 7 illustrated rotor carrier 2 be consists of two previously made by forming from a solid material, integrally formed cup-shaped parts 46 . 48 whose plane, facing each other and the axis of rotation 24 coaxial circular bottom wall parts 50 . 52 are non-rotatably connected by friction welding and one between the two cavities 8th . 10 form arranged partition.
  • The production of the welded connection takes place in the same way as before for the rotor carrier 2 in the 1 to 3 described by the two parts 46 . 48 rotated with respect to each other and the opposite end faces of the bottom wall parts 50 . 52 be pressed axially against each other.
  • After welding the two parts 12 . 14 respectively. 46 . 48 If necessary, they are first subjected to low-stress annealing in an oven before they are optionally subjected to machining in order to achieve required manufacturing tolerances of the rotor carrier 2 to ensure.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
  • Cited patent literature
    • DE 102005040771 A1 [0003]

Claims (14)

  1. Method for producing a rotor carrier for an electric machine, characterized in that the rotor carrier ( 2 ) of at least two parts ( 12 . 14 ; 46 . 48 ) is joined together, which are firmly joined together by friction welding.
  2. Method according to claim 1, characterized in that the two parts ( 12 . 14 ; 46 . 48 ) during friction welding around a rotation axis ( 24 ) are rotated, with the axis of rotation ( 24 ) coaxial areas of the two parts ( 12 . 14 ; 46 . 48 ) in the axial direction of the axis of rotation ( 24 ) are pressed against each other.
  3. Method according to one of the preceding claims, characterized in that the two parts ( 12 . 14 ) of a hollow cylindrical peripheral wall part ( 12 ) and an outline circular bottom wall part ( 14 ) of the rotor carrier ( 2 ) are formed.
  4. A method according to claim 3, characterized in that an outwardly facing peripheral surface ( 38 ) of the bottom wall part ( 14 ) is provided with an outer diameter which is greater than the inner diameter of an inwardly facing peripheral surface of the peripheral wall part ( 12 ), and that the two parts ( 12 . 14 ) in the axial direction of the axis of rotation ( 24 ) are pressed against each other.
  5. Method according to one of claims 2 to 4, characterized in that two opposite annular or circular end faces of the two parts ( 12 . 14 ; 46 . 48 ) are pressed against each other.
  6. Method according to one of the preceding claims, characterized in that the rotor carrier ( 2 ) is stress relieved annealed after friction welding.
  7. Method according to one of the preceding claims, characterized in that the rotor carrier ( 2 ) is machined after friction welding.
  8. Rotor carrier for an electric machine, characterized by at least two parts rotatably connected to one another by friction welding ( 12 . 14 ).
  9. Rotor carrier according to claim 8, characterized in that the two parts ( 12 . 14 ) of a hollow cylindrical peripheral wall part ( 12 ) and an outline circular bottom wall part ( 14 ) of the rotor carrier ( 2 ) are formed.
  10. Rotor carrier according to claim 8 or 9, characterized in that the two parts ( 12 . 14 ) along an axis of rotation ( 24 ) of the rotor carrier ( 2 ) rotationally symmetrical weld seam are interconnected.
  11. Rotor carrier according to one of claims 8 to 10, characterized in that the two parts ( 10 . 12 ) may consist of the same or different materials.
  12. Rotor carrier according to claim 11, characterized in that the two interconnected parts ( 12 . 14 ) consist of metal.
  13. Rotor carrier according to one of claims 8 to 12, characterized in that the two parts ( 12 . 14 ) are connected together along two opposite annular or circular end faces.
  14. Rotor carrier according to one of claims 8 to 13, characterized in that the two parts ( 12 . 14 ) are connected together along two opposite circumferential surfaces.
DE102007032131A 2007-06-30 2007-06-30 Rotor carrier for an electric machine and method for its production Withdrawn DE102007032131A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102007032131A DE102007032131A1 (en) 2007-06-30 2007-06-30 Rotor carrier for an electric machine and method for its production

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007032131A DE102007032131A1 (en) 2007-06-30 2007-06-30 Rotor carrier for an electric machine and method for its production
PCT/EP2008/057421 WO2009003821A2 (en) 2007-06-30 2008-06-12 Rotor support for an electric machine and method for producing the same

Publications (1)

Publication Number Publication Date
DE102007032131A1 true DE102007032131A1 (en) 2009-01-02

Family

ID=40076082

Family Applications (1)

Application Number Title Priority Date Filing Date
DE102007032131A Withdrawn DE102007032131A1 (en) 2007-06-30 2007-06-30 Rotor carrier for an electric machine and method for its production

Country Status (2)

Country Link
DE (1) DE102007032131A1 (en)
WO (1) WO2009003821A2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010022621A1 (en) * 2010-06-04 2011-12-08 Volkswagen Ag Rotor shaft i.e. distributed rotor shaft, for e.g. electric motor of automobile, has hollow body whose two ends are provided with two connectors, respectively, and shaft formed from three parts such as cover parts and intermediate part
DE102012011002A1 (en) 2012-06-02 2013-12-05 Volkswagen Aktiengesellschaft Rotor shaft i.e. hollow multi-part rotor shaft, for rotor of e.g. electric motor for motor car, has pipe element and flange parts fixed against axial displacement by snap connection and connected with each other in torque-proof manner
EP2267868A3 (en) * 2009-06-23 2014-11-12 Hamilton Sundstrand Corporation Rotor for permanent magnet electric machine
DE102014216586A1 (en) 2014-08-21 2016-02-25 Robert Bosch Gmbh Electric hybrid excited homopolar engine with two-piece shaft and pole ring
DE102017207056A1 (en) * 2017-04-26 2018-10-31 Magna powertrain gmbh & co kg Electric machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4240045C1 (en) * 1992-11-28 1994-02-03 Licentia Gmbh Electric motor, particularly for driving motor vehicles
DE19941705A1 (en) * 1998-09-09 2000-03-16 Luk Lamellen & Kupplungsbau Drive chain for an automobile, comprises an electric motor that can be used as a drive motor or generator
DE102005040771A1 (en) 2005-08-29 2007-03-08 Zf Friedrichshafen Ag Powertrain of a hybrid vehicle

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29717417U1 (en) * 1997-09-30 1999-02-04 Bosch Gmbh Robert Electrical machine, in particular three-phase generator
DE19900559C1 (en) * 1999-01-09 2000-09-21 Mannesmann Vdo Ag Compact electric motor e.g. for vehicle power steering or engine valve adjustment, has rotor shaft provided with section having high heat conduction coefficient for dissipating heat generated by motor
DE10039486A1 (en) * 2000-08-08 2002-02-21 Drm Druckgus Gmbh Metal component such as generator housing has two cast parts friction-welded to each other, with channel between them
DE10258029B4 (en) * 2001-12-21 2010-01-21 Daimler Ag Squirrel cage
EP1599928B1 (en) * 2003-02-26 2013-08-28 Robert Bosch Gmbh Electric machine comprising a permanent magnet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4240045C1 (en) * 1992-11-28 1994-02-03 Licentia Gmbh Electric motor, particularly for driving motor vehicles
DE19941705A1 (en) * 1998-09-09 2000-03-16 Luk Lamellen & Kupplungsbau Drive chain for an automobile, comprises an electric motor that can be used as a drive motor or generator
DE102005040771A1 (en) 2005-08-29 2007-03-08 Zf Friedrichshafen Ag Powertrain of a hybrid vehicle

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
http://web.archive.org./web/20070328174336/http:// de.wikipedia.org/wiki/Schwei C3 9Fen;$ Rotationsch reibschweißen$
http://web.archive.org./web/20070328174336/http://de.wikipedia.org/wiki/Schwei C3 9Fen;$ Rotationschreibschweißen$; *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2267868A3 (en) * 2009-06-23 2014-11-12 Hamilton Sundstrand Corporation Rotor for permanent magnet electric machine
DE102010022621A1 (en) * 2010-06-04 2011-12-08 Volkswagen Ag Rotor shaft i.e. distributed rotor shaft, for e.g. electric motor of automobile, has hollow body whose two ends are provided with two connectors, respectively, and shaft formed from three parts such as cover parts and intermediate part
DE102012011002A1 (en) 2012-06-02 2013-12-05 Volkswagen Aktiengesellschaft Rotor shaft i.e. hollow multi-part rotor shaft, for rotor of e.g. electric motor for motor car, has pipe element and flange parts fixed against axial displacement by snap connection and connected with each other in torque-proof manner
DE102014216586A1 (en) 2014-08-21 2016-02-25 Robert Bosch Gmbh Electric hybrid excited homopolar engine with two-piece shaft and pole ring
DE102017207056A1 (en) * 2017-04-26 2018-10-31 Magna powertrain gmbh & co kg Electric machine

Also Published As

Publication number Publication date
WO2009003821A3 (en) 2009-02-19
WO2009003821A2 (en) 2009-01-08

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