WO2015079742A1 - Convertisseur de couple pour automobile comportant un dispositif de verrouillage, et procédé pour souder une enceinte d'hélice et un capot avant de cette derniere - Google Patents

Convertisseur de couple pour automobile comportant un dispositif de verrouillage, et procédé pour souder une enceinte d'hélice et un capot avant de cette derniere Download PDF

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Publication number
WO2015079742A1
WO2015079742A1 PCT/JP2014/070540 JP2014070540W WO2015079742A1 WO 2015079742 A1 WO2015079742 A1 WO 2015079742A1 JP 2014070540 W JP2014070540 W JP 2014070540W WO 2015079742 A1 WO2015079742 A1 WO 2015079742A1
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WO
WIPO (PCT)
Prior art keywords
front cover
impeller shell
welding
laser
welded
Prior art date
Application number
PCT/JP2014/070540
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English (en)
Japanese (ja)
Inventor
慎祐 菊池
義則 兵藤
浩平 實石
Original Assignee
ユニプレス株式会社
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Filing date
Publication date
Application filed by ユニプレス株式会社 filed Critical ユニプレス株式会社
Priority to JP2015550586A priority Critical patent/JP6386473B2/ja
Publication of WO2015079742A1 publication Critical patent/WO2015079742A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H41/00—Rotary fluid gearing of the hydrokinetic type
    • F16H41/24—Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/073—Shaping the laser spot
    • B23K26/0732—Shaping the laser spot into a rectangular shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/28—Seam welding of curved planar seams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H41/00—Rotary fluid gearing of the hydrokinetic type
    • F16H41/24—Details
    • F16H2041/243—Connections between pump shell and cover shell of the turbine

Definitions

  • the present invention relates to an automotive torque converter provided with a lock-up device, and more particularly to a welding structure and a welding method at a joint portion between an impeller shell and a front cover.
  • JP 7-174208 A Japanese Patent Laid-Open No. 10-2398 JP 2002-147564 A JP 2006-509168 A Japanese Patent Publication No. 2013-87827
  • the impeller shell and the front cover have an insertion structure between the cylindrical portions, and arc welding is performed in the cylindrical portion where stress concentration hardly occurs, and the impeller shell in this cylindrical portion is formed.
  • the weld structure between the front cover and the front cover can be a countermeasure against the problems of deterioration of the flatness of the front cover surface facing the clutch fading and the flatness of the boss seat surface. I could't take complete measures against There was also a problem of interference with adjacent parts of the torque converter due to weld beads.
  • patent document 4 shows adoption of the laser welding for joining of the plate-shaped front cover with respect to a cylindrical impeller shell, it is not more than that, and is not intended to solve the above-mentioned problem. Nor could it give suggestions for a solution.
  • the present invention solves such a conventional problem, and the desired flatness of the portion of the front cover facing the clutch facing is irrespective of the heat input during the welding of the impeller shell and the front cover.
  • the purpose is to maintain.
  • the impeller shell and the front cover are welded at a plurality of locations spaced in the circumferential direction.
  • welding is performed so as to overlap with the portion temporarily fixed along the entire circumference along the joint portion between the impeller shell and the front cover.
  • welding is performed so that the solidified state of the molten metal is always maintained for each part temporarily secured in the first stage welding process. It is preferable that the molten metal extends along the circumferential direction at each welding point in the first stage welding process.
  • the adoption of laser welding in the first invention is a problem of deterioration in the flatness of the bearing surface of the boss nut and the friction material due to the fact that the stress concentration is difficult to occur due to the welding of the cylindrical portions as a result of the concentration of heat input. Will not occur. Therefore, the thermal strain after the welding process is reduced, and the waviness of the front cover surface that slides with the clutch facing can be reduced. Therefore, the desired slip lock-up operation can be performed, and the fuel consumption efficiency can be improved. Also, unlike arc welding, laser welding does not cause beading, so bead grinding was necessary because arc welding between the cylindrical parts of the impeller shell and the front cover could cause interference with adjacent components of the torque converter. It is possible to omit additional work such as this.
  • a structure in which the laser weld part is partially penetrated into the axially protruding part inside the radius beyond the abutting part is advantageous in improving the shearing characteristics.
  • laser welding with a rectangular beam cross-section makes it possible to weld with the desired quality regardless of the inevitable position and width variations in the circumferential direction of the abutment surface between the impeller shell and the front cover by appropriate selection of the beam width. Bonding can be ensured.
  • the laser beam has a vertically long rectangular cross section, and the vertically long direction of the rectangular cross section is the direction along the abutting surface.
  • the laser beam by making the laser beam a rectangular cross section, it is possible to ensure a wide irradiation area that can cover the entire area of the abutting portion that changes within the allowable tolerance range while ensuring the desired beam intensity, and the impeller shell and the front cover It is possible to reliably weld the abutting portion.
  • the welding of the outer peripheral portion of the impeller shell and the front cover is performed as a first stage by performing temporary fixing welding by welding at a plurality of locations spaced in the circumferential direction.
  • the second stage welding which is performed on each temporary welding part in the first stage, is performed so that the solidified state of the molten metal is always maintained partially in each part.
  • the temporary fixing state can be maintained at each part in the above, so that the effect of the temporary fixing is not impaired, the final thermal strain after the completion of the second stage all-around welding is reduced, and the clutch facing and sliding are reduced.
  • the undulation of the moving front cover surface can be reduced. Therefore, the desired slip lock-up operation can be performed, and the fuel consumption efficiency can be improved.
  • FIG. 1 is a sectional view of the torque converter.
  • FIG. 2 is a partially enlarged view of FIG. 1, and is a detailed view of the facing portion between the clutch facing and the front cover in the lock-up mechanism of the torque converter, (a) when not locked up, and (b) low pressing.
  • the slip lock-up state of force / high differential rotation and (c) show the slip lock-up state of high pressing force / low differential rotation, respectively.
  • 3 is an enlarged cross-sectional view of a welded portion between the impeller shell and the front cover in FIG.
  • FIG. 4 is an enlarged cross-sectional view of a conventional weld, similar to FIG.
  • FIG. 5 is a partial schematic circumferential development showing a contact surface (before welding) between the impeller shell and the front cover.
  • FIG. 6 is a schematic cross-sectional view of the abutment surface between the impeller shell and the front cover, and schematically shows a welding process using a rectangular cross-section laser.
  • FIG. 7 is similar to FIG. 2, but shows another embodiment of the present invention.
  • FIG. 8 is a cross-sectional view showing only the impeller shell and the front cover along the line VIII-VIII in FIG. 1, and shows the progress of the welding process immediately after the start of main welding after temporary welding.
  • 9 (a) to 9 (e) are circumferential development views schematically showing the progress of the main welding process after one temporary fixing at the joint of the impeller shell and the front cover.
  • FIG. 10 is a graph showing the flatness of the clutch facing engagement surface of the front cover after the completion of the main welding, where (a) shows the present invention and (b) shows the conventional one.
  • FIG. 1 shows a torque converter according to an embodiment of the present invention in a cross section along an axial line.
  • Reference numeral 10 denotes an impeller shell, and a front cover 12 (press plate of a steel plate made of the same material as the impeller shell 10) is applied to the impeller shell 10.
  • the molded product is joined by the laser welded portion 11 around the entire periphery, and an internal space sealed from the outside is formed.
  • the fluid type power transmission device 13 and the lockup device 14 are accommodated in the internal space.
  • the fluid type power transmission device 13 includes an impeller 15, a turbine 16, and a stator 17 as basic components.
  • the turbine 16 is fixed to a turbine support plate 19 on the hub 18, and the hub 18 forms a spline 18-1 on the inner peripheral surface.
  • an input shaft (not shown) of the transmission is inserted from the left side of FIG. 1 into the sleeve 20 fixed to the inner peripheral side of the impeller shell 10, and the tip of the input shaft is the spline 18-1 of the hub 18. Fitted.
  • the lock-up device 14 includes a driven plate 22 that is an output side rotating member (clamped to the hub 18 by a rivet 24 together with the turbine support plate 19), a drive plate 26 that is an input side rotating member, A plurality of circumferentially separated damper springs 28 that elastically connect the driven plate 22 and the drive plate 26 in the circumferential direction as is well known, and an equalizer plate 29 that is an intermediate member that is moved together with the damper springs 28. It consists of. Further, the drive plate 26 is fixed by a rivet 31 to a piston plate 30 that can slide on the hub 18. A clutch facing (friction material) 32 is installed on the outer peripheral surface of the piston plate 30 so as to face the front cover 12 in a minute gap.
  • the inner and outer damper springs 28 and 33 allow the relative rotation of the driven plate 22 and the drive plate 26 according to the rotation fluctuation, and the outer peripheral damper spring 28 having a small elastic modulus when the relative rotation is small.
  • a vibration absorbing function is achieved by each of the high elastic modulus inner damper springs 33 when the rotation increases.
  • the configuration and operation of the spring damper including the inner and outer damper springs 28 and 33 are substantially the same as those disclosed in Patent Document 6.
  • the portion facing the cover 12 is partially enlarged and shown in FIG. 2A, and the clutch facing 32 is made of a special paper having a good friction characteristic, and the piston facing the front cover 12 of the piston plate 30 is used.
  • the plate 30 is fixed in an annular shape on the surface.
  • the surface 30-1 of the piston plate 30 to which the clutch facing 32 is fixed is somewhat so that the inner peripheral side is retracted from the outer peripheral side with respect to the surface of the front cover 12 perpendicular to the torque converter center line C (FIG. 1). Inclined.
  • the clutch facing 32 fixed to the surface 30-1 of the piston plate 30 also exhibits the same inclination with respect to the front cover facing surface. Therefore, in the non-lock-up state in which the clutch facing 32 is separated from the facing surface of the front cover 12, the size of the gap S between the front cover 12 and the clutch facing 32 is smaller on the outer peripheral side and larger on the inner peripheral side. . A portion 12A facing the clutch facing 32 on the surface of the front cover is roughened.
  • the piston shifts to the slip lock-up state due to the difference between the low rotational speed of the piston plate 30 and the large rotational speed of the front cover 12, but because of the inclination of the surface 30-1 of the piston plate 30,
  • the slip lock-up state at this time is a slip lock-up under a low pressing force and high differential rotation.
  • power transmission by a lock-up clutch is also performed, but the power transmission function by a torque converter is still effective, and power transmission occurs in the presence of both. Since the annular region 12A of the front cover 12 that comes into contact with the clutch facing 32 has a rough surface, the oil film between the clutch facing 32 and the front cover 12 can be satisfactorily cut and a good slip can be obtained. You can get a lockup.
  • the distal end of the cylindrical portion 12-1 forms an outer cylindrical protruding portion 12-1A that is stripped on the inner diameter side, and the inner cylindrical protruding portion 10-1A of the impeller shell 10 and the outer cylindrical shape of the front cover 12.
  • the protrusions 12-1A are axially fitted to each other, and in this embodiment, the laser beam is applied to the abutting surface of the outer cylindrical protrusion 12-1A with respect to the cylindrical part 10-1 of the impeller shell 10 as described later. Irradiation forms the weld 11.
  • the problem with the welded part 111 by this conventional arc welding is that the flatness of the part of the front cover 12 (FIG. 2) facing the clutch facing 32 is deteriorated due to heat input during welding. That is, in the arc welding, heat input to the adjacent portion of the welded portion is large, and thermal distortion is generated in the front cover 12 at the portion facing the clutch facing 32. This thermal strain, particularly the surface facing the clutch facing 32, is generated.
  • the flatness of the front cover 12 deteriorates. The deterioration of the flatness of the surface 12A adversely affects the above-described slip lock-up control in which the clutch facing 32 is slid with respect to the surface of the front cover 12 facing the lock-up control, particularly when the lock-up control is started.
  • the presence of the undulation on the front cover surface 12A increases the pressure fluctuation of the oil film due to the so-called wedge effect, and the desired slip lock-up control cannot be performed. Further, the deteriorated flatness of the front cover 12 at the portion facing the clutch facing 32 is caused by the sliding resistance with the clutch facing 32 (the gap between the clutch facing and the front cover 12 facing portion cannot be increased so much).
  • a material having a high yield strength is required in order to increase the frictional force of the clutch phasing 32.
  • the large heat input to the part adjacent to the welded part by arc welding also deteriorates the flatness of the seating surface 34A of the boss nut 34 (the mounting surface of the rotating plate 35 in FIG. 1).
  • the expected processing of the seat surface 34A of the boss nut 34 (the seat surface 34A of the boss nut 34 is cut into a taper shape in accordance with the assumed thermal strain, and the seat surface 34A is formed by thermal strain. It is necessary to perform a process for correcting so as to be parallel. Further, there is a problem of buffering to adjacent components of the torque converter due to the weld bead. That is, in the case of arc welding, a weld bead 111A is inevitably generated as shown in FIG. 4, and the swell of the weld bead 111A is likely to interfere with external parts (the interference line is schematically indicated by L). ) In order not to exceed the interference line L, a cutting process for removing the raised portion of the weld bead 111A is required as a post-process.
  • a rectangular beam spot shape is employed so as to cover the variation range of the abutting surface in the circumferential direction.
  • a laser beam having a rectangular cross section for example, a YAG laser is described in Japanese Patent Application Laid-Open No. 2011-18823. Is preferable.
  • an L1 type laser welding apparatus (output 4 kW) manufactured by Enshu Corporation can be used.
  • the welded portion is composed of two stages, that is, temporary fixing between the impeller shell 10 and the front cover 12 and final fixing, in particular, the temporary fixing welding portion Wp is elongated in the circumferential direction, and temporary fixing welding is performed during final fixing welding.
  • the welding method that always maintains a part in a solidified state is not limited to laser welding, and the effects described in relation to FIGS. The effect according to can be produced.

Abstract

　La présente invention porte sur une structure soudée et sur un procédé de soudage au laser pour une section reliée d'une enceinte d'hélice et d'un capot avant dans un convertisseur de couple pour une automobile. Une enceinte d'hélice (10) et un capot avant (12) ont une structure dans laquelle leurs saillies tubulaires axiales (10-1A, 12-1A) viennent en prise entre elles dans une direction axiale, et la saillie tubulaire axiale (12-1A) positionnée sur le côté radialement externe et une surface de butée opposée sont soudées dans une section soudée au laser (14) sur la totalité de la périphérie. Une section soudée au laser (11) s'étend à partir de la surface périphérique radialement externe dans l'espace entre les surfaces de butée, de façon à pénétrer partiellement dans la saillie tubulaire axiale (10-1A) sur le côté radialement interne (profondeur de pénétration = d). Un faisceau de soudage a une section transversale rectangulaire. La forme de la section soudée (11) est constituée par un soudage de collage laissant un espace le long de la direction périphérique dans une première étape, et un soudage final dans la totalité de la périphérie dans une seconde étape, et la section soudée de collage a une longue forme mince, de telle sorte qu'une partie de cette dernière reste dans un état solidifié pendant le soudage final.
PCT/JP2014/070540 2013-11-26 2014-08-05 Convertisseur de couple pour automobile comportant un dispositif de verrouillage, et procédé pour souder une enceinte d'hélice et un capot avant de cette derniere WO2015079742A1 (fr)

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Application Number Priority Date Filing Date Title
JP2015550586A JP6386473B2 (ja) 2013-11-26 2014-08-05 ロックアップ装置を備えた自動車用トルクコンバータ及びそのインペラシェルとフロントカバーとの溶接方法

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JP2013243782 2013-11-26
JP2013-243782 2013-11-26
JP2014-081206 2014-04-10
JP2014081206 2014-04-10

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017210971A (ja) * 2016-05-23 2017-11-30 アイシン・エィ・ダブリュ工業株式会社 発進装置
CN114670971A (zh) * 2020-12-25 2022-06-28 株式会社岛野 自行车部件和形成自行车部件的方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59215288A (ja) * 1983-05-20 1984-12-05 Mitsubishi Motors Corp 板材のレ−ザ−溶接方法
JPH0215891A (ja) * 1988-05-17 1990-01-19 Ford Motor Co トルクコンバータとその溶接方法
JPH0366485A (ja) * 1989-07-31 1991-03-22 Komatsu Ltd 円筒部材の溶接方法
DE19755168A1 (de) * 1997-12-11 1999-06-17 Mannesmann Sachs Ag Verfahren zum Verbinden von wenigstens zwei Komponenten eines Drehmomentwandlers
JPH11200397A (ja) * 1998-01-10 1999-07-27 Komatsu Ltd 建機作業機用箱形構造物の製造方法
JP2004063406A (ja) * 2002-07-31 2004-02-26 Sanyo Electric Co Ltd レーザー封口電池及びその製造方法及びこれに用いるレーザー照射装置
JP2008057782A (ja) * 2006-09-01 2008-03-13 Luk Lamellen & Kupplungsbau Beteiligungs Kg トルクコンバータのための継目ガス溶接及びトルクコンバータをガス溶接する方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59215288A (ja) * 1983-05-20 1984-12-05 Mitsubishi Motors Corp 板材のレ−ザ−溶接方法
JPH0215891A (ja) * 1988-05-17 1990-01-19 Ford Motor Co トルクコンバータとその溶接方法
JPH0366485A (ja) * 1989-07-31 1991-03-22 Komatsu Ltd 円筒部材の溶接方法
DE19755168A1 (de) * 1997-12-11 1999-06-17 Mannesmann Sachs Ag Verfahren zum Verbinden von wenigstens zwei Komponenten eines Drehmomentwandlers
JPH11200397A (ja) * 1998-01-10 1999-07-27 Komatsu Ltd 建機作業機用箱形構造物の製造方法
JP2004063406A (ja) * 2002-07-31 2004-02-26 Sanyo Electric Co Ltd レーザー封口電池及びその製造方法及びこれに用いるレーザー照射装置
JP2008057782A (ja) * 2006-09-01 2008-03-13 Luk Lamellen & Kupplungsbau Beteiligungs Kg トルクコンバータのための継目ガス溶接及びトルクコンバータをガス溶接する方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017210971A (ja) * 2016-05-23 2017-11-30 アイシン・エィ・ダブリュ工業株式会社 発進装置
CN114670971A (zh) * 2020-12-25 2022-06-28 株式会社岛野 自行车部件和形成自行车部件的方法

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JP6386473B2 (ja) 2018-09-05

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