JPH04266444A - Manufacture of piston for clutch - Google Patents
Manufacture of piston for clutchInfo
- Publication number
- JPH04266444A JPH04266444A JP3028709A JP2870991A JPH04266444A JP H04266444 A JPH04266444 A JP H04266444A JP 3028709 A JP3028709 A JP 3028709A JP 2870991 A JP2870991 A JP 2870991A JP H04266444 A JPH04266444 A JP H04266444A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- piston body
- annular
- blank
- wall thickness
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 44
- 230000002093 peripheral effect Effects 0.000 claims abstract description 24
- 238000003754 machining Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 15
- 230000007423 decrease Effects 0.000 claims description 7
- 235000014676 Phragmites communis Nutrition 0.000 claims description 6
- 230000004323 axial length Effects 0.000 claims description 5
- 238000007373 indentation Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 abstract description 6
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 abstract 1
- 238000005482 strain hardening Methods 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D25/00—Fluid-actuated clutches
- F16D25/06—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch
- F16D25/062—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces
- F16D25/063—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially
- F16D25/0635—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially with flat friction surfaces, e.g. discs
- F16D25/0638—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially with flat friction surfaces, e.g. discs with more than two discs, e.g. multiple lamellae
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
- Forging (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、摩擦式多板クラッチ、
自動変速機のクラッチ等に用いられるクラッチ用ピスト
ン、特に、環状円板形ピストン本体外周縁に、そのピス
トン本体よりも厚肉に形成されてクラッチハウジングの
外筒部内周面を摺動するリム部を連設し、またピストン
本体内周縁に、そのピストン本体よりも厚肉に形成され
てクラッチハウジングの外筒部と同心の内筒部外周面を
摺動するボス部を連設し、リム部外周面およびボス部内
周面にそれぞれシール部材装着用環状溝を設けたクラッ
チ用ピストンを製造する方法に関する。[Industrial Application Field] The present invention relates to a friction type multi-disc clutch,
A clutch piston used in automatic transmission clutches, etc., especially a rim portion that is formed on the outer periphery of an annular disc-shaped piston body and that is thicker than the piston body and that slides on the inner periphery of the outer cylindrical part of the clutch housing. A boss part is provided on the inner periphery of the piston body that is thicker than the piston body and slides on the outer periphery of the inner cylindrical part that is concentric with the outer cylindrical part of the clutch housing. The present invention relates to a method of manufacturing a clutch piston in which an annular groove for attaching a seal member is provided on an outer circumferential surface and an inner circumferential surface of a boss portion, respectively.
【０００２】0002
【従来の技術】従来、この種ピストンの製造に当っては
、鋳造法または鍛造法の適用下でピストン素材を製造し
、次いでピストン素材に機械加工を施す、といった方法
が採用されている。2. Description of the Related Art Conventionally, in manufacturing this type of piston, a method has been adopted in which a piston material is manufactured using a casting method or a forging method, and then the piston material is subjected to machining.
【０００３】0003
【発明が解決しようとする課題】しかしながら、前記従
来法は何れも高温下にてピストン素材を製造しなければ
ならないので、その製造作業性が悪く、また製造工数が
多いことに起因してピストンの製造コストが高くなる、
といった問題がある。[Problems to be Solved by the Invention] However, in all of the above conventional methods, the piston material must be manufactured at high temperatures, which results in poor manufacturing workability and a large number of manufacturing steps. manufacturing costs increase,
There are problems like this.
【０００４】本発明は前記に鑑み、前記ピストンの製造
過程に冷間加工を組込むことによって前記問題を解決す
ることができるようにした前記製造方法を提供すること
を目的とする。[0004] In view of the above, an object of the present invention is to provide a manufacturing method that can solve the above problems by incorporating cold working into the manufacturing process of the piston.
【０００５】[0005]
【課題を解決するための手段】本発明は、環状円板形ピ
ストン本体外周縁に、そのピストン本体よりも厚肉に形
成されてクラッチハウジングの外筒部内周面を摺動する
リム部を連設し、また前記ピストン本体内周縁に、その
ピストン本体よりも厚肉に形成されて前記クラッチハウ
ジングの前記外筒部と同心の内筒部外周面を摺動するボ
ス部を連設し、前記リム部外周面および前記ボス部内周
面にそれぞれシール部材装着用環状溝を設けたクラッチ
用ピストンを製造するに当り、円板状ブランク中心部の
下孔周辺部にバーリング加工を施して前記ボス部よりも
軸方向長さの短い小ボスを成形し、次いで前記小ボス部
外周面に隣接する前記ブランクの内周領域に、その領域
を軸方向に加圧する部分押込み加工を施して、前記内周
領域の肉厚を減少させることにより前記ピストン本体を
成形し、同時に前記肉厚の減少に伴う半径方向外方への
材料の流れにより前記ブランクの外周領域の肉厚を増加
させて前記リム部を成形し、また前記肉厚の減少に伴う
軸方向への材料の流れにより前記小ボス部を伸長させて
前記ボス部を成形することによってピストン素材を製造
し、その後前記ピストン素材に機械加工を施して前記両
シール部材装着用環状溝を形成することを特徴とする。[Means for Solving the Problems] The present invention connects a rim portion, which is formed thicker than the piston body and slides on the inner peripheral surface of the outer cylinder portion of the clutch housing, to the outer peripheral edge of the annular disc-shaped piston body. Further, a boss portion is provided on the inner peripheral edge of the piston body, the boss portion being formed thicker than the piston body and sliding on the outer peripheral surface of the inner cylinder portion concentric with the outer cylinder portion of the clutch housing, In manufacturing a clutch piston in which an annular groove for attaching a sealing member is provided on the outer circumferential surface of the rim portion and the inner circumferential surface of the boss portion, a burring process is performed around the prepared hole in the center of the disc-shaped blank to form an annular groove for attaching the seal member to the inner circumferential surface of the boss portion. A small boss having an axial length shorter than that of the small boss is formed, and then a partial indentation process is applied to the inner circumferential area of the blank adjacent to the outer circumferential surface of the small boss part to apply pressure in the axial direction to the inner circumference. The piston body is formed by reducing the wall thickness in the region, and the rim portion is simultaneously formed by increasing the wall thickness in the outer circumferential region of the blank due to the radially outward flow of material as the wall thickness decreases. A piston material is manufactured by molding the small boss portion by elongating the small boss portion due to the flow of material in the axial direction as the wall thickness decreases, and then machining the piston material. and forming the annular groove for mounting both seal members.
【０００６】[0006]
【実施例】図１は、本発明により得られたピストンを有
する自動変速機用クラッチ１を示す。筒状クラッチハウ
ジング２は、同心状に配設される外筒部３および内筒部
４の一端相互間に環状端壁部５を連設したもので、その
環状端壁部５の外面に内筒部４と同軸上に中空の駆動軸
６が連設される。駆動軸６は軸受７を介して支持部材８
に支持される。外筒部３内周面と内筒部４外周面との間
に円板状ピストン９が摺動自在に嵌合され、そのピスト
ン９と端壁部５との間に油圧室１０が画成される。ピス
トン９に戻しばね１１が連結され、その戻しばね１１は
ピストン９をクラッチ切断方向へ付勢する。外筒部３内
周面および被動部材１２の筒状部１３外周面間に、複数
の駆動クラッチ板１４と被動クラッチ板１５とが交互に
配設される。各駆動クラッチ板１４は外筒部３内周面に
スプライン結合され、また各被動クラッチ板１５は筒状
部１３外周面にスプライン結合される。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a clutch 1 for an automatic transmission having a piston obtained according to the present invention. The cylindrical clutch housing 2 has an annular end wall 5 connected between one end of an outer cylindrical part 3 and an inner cylindrical part 4 arranged concentrically, and has an inner cylindrical end wall 5 on the outer surface of the annular end wall 5. A hollow drive shaft 6 is disposed coaxially with the cylindrical portion 4 . The drive shaft 6 is connected to a support member 8 via a bearing 7.
Supported by A disc-shaped piston 9 is slidably fitted between the inner peripheral surface of the outer cylinder part 3 and the outer peripheral surface of the inner cylinder part 4, and a hydraulic chamber 10 is defined between the piston 9 and the end wall part 5. be done. A return spring 11 is connected to the piston 9, and the return spring 11 urges the piston 9 in the clutch disengaging direction. A plurality of driving clutch plates 14 and driven clutch plates 15 are alternately arranged between the inner circumferential surface of the outer cylindrical portion 3 and the outer circumferential surface of the cylindrical portion 13 of the driven member 12. Each driving clutch plate 14 is spline-coupled to the inner circumferential surface of the outer cylindrical portion 3, and each driven clutch plate 15 is spline-coupled to the outer circumferential surface of the cylindrical portion 13.
【０００７】上記構成において、油圧室１０に油圧を供
給すると、その油圧によりピストン９が前進し、駆動ク
ラッチ板１４が被動クラッチ板１５に圧接されてクラッ
チ１が接続され、これにより駆動軸６より被動部材１２
に動力が伝達される。一方、油圧室１０への油圧の供給
を解除すると、ピストン９が戻しばね１１の弾発力によ
り後退してクラッチ１が切断され、これにより前記動力
伝達が解除される。In the above configuration, when hydraulic pressure is supplied to the hydraulic chamber 10, the piston 9 moves forward due to the hydraulic pressure, and the drive clutch plate 14 is pressed against the driven clutch plate 15, thereby connecting the clutch 1. Driven member 12
Power is transmitted to. On the other hand, when the supply of hydraulic pressure to the hydraulic chamber 10 is canceled, the piston 9 retreats due to the elastic force of the return spring 11, and the clutch 1 is disengaged, thereby canceling the power transmission.
【０００８】図１〜図３に明示するように、ピストン９
は、環状円板形ピストン本体１６と、そのピストン本体
１６の外周縁に連設されてクラッチハウジング２の外筒
部３内周面を摺動するリム部１７と、ピストン本体１６
の内周縁に連設されてクラッチハウジング２の内筒部４
外周面を摺動するボス部１８とよりなる。リム部１７は
、その外周縁にクラッチハウジング２の環状端壁部５に
当接してピストン９の後退限を規制する環状凸縁１９を
有する。リム部１７およびボス部１８はピストン本体１
６よりも厚肉に形成されており、リム部１７外周面にシ
ール部材２０を装着する環状溝２１が設けられ、またボ
ス部１８内周面にシール部材２２を装着する環状溝２３
および環状逃げ２４が設けられる。As clearly shown in FIGS. 1 to 3, the piston 9
The piston body 16 includes an annular disc-shaped piston body 16, a rim part 17 that is connected to the outer circumferential edge of the piston body 16 and slides on the inner circumferential surface of the outer cylinder part 3 of the clutch housing 2, and the piston body 16.
The inner cylindrical portion 4 of the clutch housing 2 is connected to the inner peripheral edge of the clutch housing 2.
It consists of a boss portion 18 that slides on the outer peripheral surface. The rim portion 17 has an annular convex edge 19 on its outer periphery that abuts the annular end wall portion 5 of the clutch housing 2 and restricts the retraction limit of the piston 9. The rim portion 17 and the boss portion 18 are connected to the piston body 1
6, and is provided with an annular groove 21 on the outer circumferential surface of the rim portion 17 for attaching the seal member 20, and an annular groove 23 for attaching the seal member 22 on the inner circumferential surface of the boss portion 18.
and an annular relief 24 are provided.
【０００９】ピストン９において、油圧室１０に臨む受
圧面２５に、半径方向に延びる複数のリード弁用取付溝
２６が円周上等間隔に形成されている。各取付溝２６に
おいて、その半径方向内方端は、ピストン本体１６の内
周縁近傍に、また半径方向外方端はリム部１７の環状凸
縁１９にそれぞれ位置し、半径方向内方端から半径方向
外方端に向って深さが増加している。各取付溝２６底面
に、半径方向内方端近傍にあってピストン本体１６を貫
通するリベット孔２７と、リム部１７にあってそのリム
部１７を貫通するリリーフポート２８と、リリーフポー
ト２８よりも外周側でリム部１７に形成された凹部２９
とがそれぞれ開口する。またリム部１７に取付溝２６を
挟む一対のリベット孔３０が形成される。In the piston 9, a plurality of radially extending reed valve mounting grooves 26 are formed on the pressure receiving surface 25 facing the hydraulic chamber 10 at equal intervals on the circumference. In each mounting groove 26, the radially inner end is located near the inner circumferential edge of the piston body 16, and the radially outer end is located on the annular convex edge 19 of the rim portion 17. The depth increases toward the outer end. On the bottom surface of each mounting groove 26, there is a rivet hole 27 that is near the radially inner end and passes through the piston body 16, a relief port 28 that is in the rim part 17 and passes through the rim part 17, and A recess 29 formed in the rim portion 17 on the outer circumferential side
and open respectively. Further, a pair of rivet holes 30 are formed in the rim portion 17, sandwiching the mounting groove 26 therebetween.
【００１０】リード弁３１は、その基端をリベット孔２
７に挿通されたリベット３２により固着されて取付溝２
６内に収容され、先端には凹部２９内に遊嵌される重錘
３３が設けられる。重錘３３を覆うように、取付溝２６
の両側間に板状ストッパ３４が渡されており、そのスト
ッパ３４は両リベット孔３０に挿通されたリベット３５
によりリム部１７に固着される。The reed valve 31 has its base end connected to the rivet hole 2.
7 is fixed by the rivet 32 inserted into the mounting groove 2.
6, and a weight 33 that is loosely fitted into the recess 29 is provided at the tip. The mounting groove 26 covers the weight 33.
A plate-shaped stopper 34 is passed between both sides of the rivet holes 30.
It is fixed to the rim part 17 by.
【００１１】リード弁３１は、ピストン９の回転に伴い
重錘３３に作用する遠心力で油圧室１０側へ撓むことに
よりリリーフポート２８を開放するもので、これにより
クラッチ切断時におけるピストン９の後退を迅速に行う
ことができる。この場合、リード弁３１の撓み量はスト
ッパ３４によって規制される。The reed valve 31 opens the relief port 28 by bending toward the hydraulic chamber 10 due to the centrifugal force acting on the weight 33 as the piston 9 rotates. You can quickly retreat. In this case, the amount of deflection of the reed valve 31 is regulated by the stopper 34.
【００１２】次に前記ピストン９の製造方法について説
明する。その製造方法は、図４に示すように、ピストン
本体１６、環状凸縁１９を有するリム部１７およびボス
部１８を備えたピストン素材９０ を冷間加工により製
造し、次いでピストン素材９０ に取付溝２６を冷間加
工により成形し、その後ピストン素材９０ に機械加工
を施す、といった過程を経て実施される。Next, a method of manufacturing the piston 9 will be explained. As shown in FIG. 4, the manufacturing method is to cold-work a piston material 90 that includes a piston body 16, a rim portion 17 having an annular convex edge 19, and a boss portion 18, and then insert a mounting groove into the piston material 90. 26 is formed by cold working, and then the piston material 90 is machined.
【００１３】図５は、ピストン素材９０ を製造するた
めの第１冷間加工装置を示し、その装置は昇降自在のポ
ンチ３６と、その下方に配置された固定のダイス３７と
よりなる。FIG. 5 shows a first cold working device for manufacturing the piston blank 90, which device is comprised of a punch 36 that can be raised and lowered and a fixed die 37 disposed below the punch 36.
【００１４】ポンチ３６は、ポンチ本体３８と、ポンチ
本体３８に、その下端面を半径方向幅の狭い第１環状面
３９に形成するように突設された軸方向長さの短い外側
凸部４０と、その外側凸部４０に、その下端面を半径方
向幅の広い第２環状面４１に形成するように突設された
軸方向長さの長い内側凸部４２とを備えている。The punch 36 includes a punch body 38 and an outer convex portion 40 having a short axial length and protruding from the punch body 38 so as to form a first annular surface 39 having a narrow radial width at its lower end surface. The outer protrusion 40 is provided with an inner protrusion 42 having a long axial length and protruding so that its lower end surface forms a second annular surface 41 having a wide radial width.
【００１５】ダイス３７は、内側凸部４２に対向する凹
部４３と、凹部４３を囲繞して第２環状面４１の内周側
略半部に対向する環状凸部４４と、環状凸部４４を囲繞
して第２環状面４１の外周側略半部および第１環状面３
９に対向する環状凹部４５とを有する。環状凹部４５を
画成する外周壁４６は環状凸部４４の上端面よりも上方
へ延びている。The die 37 has a concave portion 43 facing the inner convex portion 42, an annular convex portion 44 surrounding the concave portion 43 and opposing approximately the inner half of the second annular surface 41, and an annular convex portion 44. Surrounding approximately half of the outer peripheral side of the second annular surface 41 and the first annular surface 3
9 and an annular recess 45 facing the opposite end. An outer peripheral wall 46 defining the annular recess 45 extends upward from the upper end surface of the annular protrusion 44 .
【００１６】ポンチ３６の内側凸部４２は、上側の等径
部分４７と、その下側にあって先細りとなる円錐台形部
分４８とよりなり、それに対応してダイス３７の凹部４
３は上側の等径部分４９と、下側の円錐台形部分５０と
より形成される。The inner convex portion 42 of the punch 36 consists of an upper equal-diameter portion 47 and a tapered truncated conical portion 48 on the lower side.
3 is formed by an upper equal diameter portion 49 and a lower truncated conical portion 50.
【００１７】ポンチ３６の内側凸部４２において、その
等径部分４７の外径は、ピストン素材９０ におけるボ
ス部１８の内径に略等しく、また外側凸部４０の外径は
環状凸縁１９の内径に略等しい。一方、ダイス３７の凹
部４３における等径部分４９の内径はボス部１８の外径
に略等しく、また環状凸部４４の外径はピストン本体１
６の外径に略等しく、さらに環状凹部４５の外径はリム
部１７の外径に略等しい。凹部４３の円錐台形部分５０
は、ダイス３７のエジェクタピン５１の上端部に形成さ
れている。In the inner convex portion 42 of the punch 36, the outer diameter of the equal diameter portion 47 is approximately equal to the inner diameter of the boss portion 18 in the piston material 90, and the outer diameter of the outer convex portion 40 is equal to the inner diameter of the annular convex edge 19. approximately equal to. On the other hand, the inner diameter of the equal diameter portion 49 in the concave portion 43 of the die 37 is approximately equal to the outer diameter of the boss portion 18, and the outer diameter of the annular convex portion 44 is approximately equal to the outer diameter of the boss portion 18.
Further, the outer diameter of the annular recess 45 is substantially equal to the outer diameter of the rim portion 17. truncated conical portion 50 of recess 43
is formed at the upper end of the ejector pin 51 of the die 37.
【００１８】ピストン素材９０ の製造に当っては、先
ず、図４に示すように、中心部に下孔５２を有する円板
状ブランク５３を鋼板より打抜く。そのブランク５３の
外径はダイス３７における環状凹部４５の外径に略等し
く、また下孔５２の直径はポンチ３６における等径部分
４７の外径よりも小さく、且つ円錐台形部分４８下端面
の外径よりも大きい。In manufacturing the piston material 90, first, as shown in FIG. 4, a disc-shaped blank 53 having a pilot hole 52 in the center is punched out of a steel plate. The outer diameter of the blank 53 is approximately equal to the outer diameter of the annular recess 45 in the die 37, and the diameter of the pilot hole 52 is smaller than the outer diameter of the equal diameter portion 47 in the punch 36, and larger than the diameter.
【００１９】図５に示すように、ダイス３７にブランク
５３を設置して、その環状下端面を環状凸部４４上端面
に載せ、また外周面を外周壁４６内面に接触させる。As shown in FIG. 5, a blank 53 is placed on the die 37, and its annular lower end surface is placed on the upper end surface of the annular convex portion 44, and its outer circumferential surface is brought into contact with the inner surface of the outer circumferential wall 46.
【００２０】図６に示すように、ポンチ３６を下降させ
て、その内側凸部４２によりブランク５３の下孔５２周
辺部にバーリング加工を施す。このバーリング加工によ
り下孔５２が拡径されると共にその周辺部が環状凸部４
４内周縁に沿って筒状にしごかれるので、ブランク５３
にボス部１８よりも軸方向長さの短い小ボス部５４が成
形される。この小ボス部５４成形終了時にはポンチ３６
の第２環状面４１がブランク５３の環状上端面に当接す
る。As shown in FIG. 6, the punch 36 is lowered and the inner convex portion 42 is used to perform burring around the prepared hole 52 of the blank 53. As shown in FIG. By this burring process, the diameter of the lower hole 52 is enlarged, and the peripheral portion thereof is formed into an annular convex portion 4.
4.The blank 53 is squeezed into a cylindrical shape along the inner peripheral edge.
A small boss portion 54 having a shorter axial length than the boss portion 18 is formed. When this small boss portion 54 has been formed, the punch 36
The second annular surface 41 of the blank 53 contacts the annular upper end surface of the blank 53 .
【００２１】図７に示すように、引続きポンチ３６を下
降させて、小ボス部５４の外周面に隣接するブランク５
３の内周領域Ｒ１ を、環状凸部４４により軸方向に加
圧する部分押込み加工を行う。As shown in FIG. 7, the punch 36 is subsequently lowered to punch the blank 5 adjacent to the outer peripheral surface of the small boss portion 54.
A partial indentation process is performed in which the inner peripheral region R1 of No. 3 is pressurized in the axial direction by the annular convex portion 44.
【００２２】この部分押込み加工により内周領域Ｒ１
の肉厚が減少して、環状凸部４４および第２環状面４１
の内周側略半部間にピストン本体１６が成形される。同
時に、前記肉厚の減少に伴う半径方向外方への材料の流
れａにより、ブランク５３の外周領域Ｒ２ の肉厚が増
加して環状凹部４５と、第２環状面４１の外周側略半部
および第１環状面３９との間に環状凸縁１９を有するリ
ム部１７が成形される。このリム部１７は、取付溝２６
の半径方向外方端側を形成し得る半径方向幅と肉厚とを
備えている。また前記肉厚の減少に伴う軸方向への材料
の流れｂにより小ボス部５４が伸長して、凹部４３およ
び内側凸部４２の両等径部分４７，４９間にボス部１８
が成形される。[0022] Through this partial pressing process, the inner peripheral region R1
The wall thickness of the annular convex portion 44 and the second annular surface 41 is reduced.
A piston body 16 is formed between approximately half of the inner peripheral side. At the same time, due to the flow a of the material radially outward as the wall thickness decreases, the wall thickness of the outer circumferential region R2 of the blank 53 increases, forming the annular recess 45 and approximately half of the outer circumferential side of the second annular surface 41. A rim portion 17 having an annular convex edge 19 between the first annular surface 39 and the first annular surface 39 is formed. This rim portion 17 has a mounting groove 26
It has a radial width and a wall thickness that can form a radially outer end side of. Further, the small boss portion 54 expands due to the material flow b in the axial direction due to the decrease in the wall thickness, and the boss portion 18 extends between the equal diameter portions 47 and 49 of the concave portion 43 and the inner convex portion 42.
is formed.
【００２３】以上の工程を経て、ピストン素材９０ が
製造される。図８は、ピストン素材９０ に取付溝２６
を成形するための第２冷間加工装置を示し、その装置は
昇降自在のポンチ５５と、その下方に配置された固定の
ダイス５６とよりなる。[0023] Through the above steps, the piston material 90 is manufactured. FIG. 8 shows the mounting groove 26 in the piston material 90.
This figure shows a second cold working device for forming a molding machine, which device consists of a punch 55 that can be raised and lowered, and a fixed die 56 arranged below the punch 55.
【００２４】ポンチ５５は、その下端部にピストン素材
９０ の環状凸縁１９内側に嵌合される円形凸部５７を
有し、その凸部５７の下端面に取付溝２６を成形するた
めの複数の押込み突起５８が円周上等間隔に配設されて
いる。The punch 55 has a circular convex portion 57 at its lower end that is fitted inside the annular convex edge 19 of the piston material 90, and has a plurality of circular convex portions 57 for forming the mounting grooves 26 on the lower end surface of the convex portion 57. The push-in protrusions 58 are arranged at equal intervals on the circumference.
【００２５】ダイス５６は、ボス部１８を嵌合する凹部
５９と、ピストン本体１６を支承する環状凸部６０と、
リム部１７を嵌合する環状凹部６１とを有する。環状凸
部６０および環状凹部６１底壁は、ダイス５６の中空筒
状形エジェクタコア６２の上端部に形成される。The die 56 has a recess 59 into which the boss 18 is fitted, an annular projection 60 which supports the piston body 16, and
It has an annular recess 61 into which the rim portion 17 is fitted. The annular protrusion 60 and the annular recess 61 bottom wall are formed at the upper end of the hollow cylindrical ejector core 62 of the die 56 .
【００２６】各取付溝２６の成形に当っては、先ず、図
８に示すようにピストン素材９０ をダイス５６に設置
して、そのボス部１８を凹部５９に嵌合し、またピスト
ン本体１６を環状凸部６０に支承させ、さらにリム部１
７を環状凹部６１に嵌合する。In forming each mounting groove 26, first, as shown in FIG. 8, a piston material 90 is placed in the die 56, its boss portion 18 is fitted into the recess 59, and the piston body 16 is The annular convex portion 60 supports the rim portion 1.
7 is fitted into the annular recess 61.
【００２７】次いで、図９に示すようにポンチ５５を下
降させて各押込み突起５８により、ピストン本体１６の
内周縁近傍からリム部１７の環状凸縁１９内側に亘り部
分押込み加工を施して各取付溝２６を成形する。Next, as shown in FIG. 9, the punch 55 is lowered and the push-in protrusions 58 are used to partially press the area from the vicinity of the inner peripheral edge of the piston body 16 to the inside of the annular convex edge 19 of the rim portion 17, thereby completing each installation. Form the groove 26.
【００２８】この取付溝２６の成形後、ピストン素材９
０ に機械加工を施して、ボス部１８にシール部材装着
用環状溝２３および環状逃げ２４を形成し、またリム部
１７にシール部材装着用環状溝２１、リリーフポート２
８、両リベット孔３０および凹部２９を形成し、さらに
ピストン本体１６にリベット孔２７を形成する。After forming the mounting groove 26, the piston material 9
0 to form an annular groove 23 for attaching a seal member and an annular relief 24 in the boss portion 18, and an annular groove 21 for attaching a seal member and a relief port 2 in the rim portion 17.
8. Form both rivet holes 30 and the recess 29, and further form a rivet hole 27 in the piston body 16.
【００２９】以上の工程を経てピストン９が製造される
。図１０に示すように、取付溝２６の成形時、その開口
縁６３のだれを防止するため、リム部１７の、受圧面２
５と反対側の環状面６４に、取付溝２６を挟むように一
対の小孔６５を部分押込み加工により成形することは有
効な手段である。これら小孔６５の加工寸法は、例えば
、取付溝２６の幅１１ｍｍに対し、直径５．５ｍｍ、深
さ１．３ｍｍ、両小孔６５間のピッチ１８ｍｍに設定さ
れる。
各小孔６５は各リベット孔３０の下孔として利用される
。The piston 9 is manufactured through the above steps. As shown in FIG. 10, when forming the mounting groove 26, in order to prevent the opening edge 63 from sagging, the pressure receiving surface 2 of the rim portion 17 is
It is an effective means to form a pair of small holes 65 on the annular surface 64 on the opposite side of the mounting groove 5 by partial pressing so as to sandwich the mounting groove 26 therebetween. The machining dimensions of these small holes 65 are set to, for example, a diameter of 5.5 mm, a depth of 1.3 mm, and a pitch between both small holes 65 of 18 mm with respect to the width of the mounting groove 26 of 11 mm. Each small hole 65 is used as a pilot hole for each rivet hole 30.
【００３０】図１１，図１２は、取付溝２６の成形と同
時に環状凸縁１９を成形するようにした二つの例を示す
。FIGS. 11 and 12 show two examples in which the annular convex edge 19 is formed at the same time as the mounting groove 26 is formed.
【００３１】図１１の場合は、環状凸縁１９を持たない
リム部１７を備えたピストン素材９０ を製造し、取付
溝２６の成形時、リム部１７の、受圧面２５と反対側の
環状面６４外周部に環状段付部６６を部分押込み加工に
より成形し、それに応じて受圧面２５側へ環状凸縁１９
を押出するものである。In the case of FIG. 11, a piston material 90 having a rim portion 17 without an annular convex edge 19 is manufactured, and when forming the mounting groove 26, the annular surface of the rim portion 17 on the opposite side from the pressure receiving surface 25 is formed. An annular stepped portion 66 is formed on the outer periphery of the 64 by partial pressing, and an annular convex edge 19 is formed on the pressure receiving surface 25 side accordingly.
It extrudes.
【００３２】図１２の場合は、取付溝２６の成形時、前
記ピストン素材９０におけるリム部１７の、受圧面２５
と反対側の環状面６４に断面鉤形の環状凹部６７を部分
押込み加工により成形し、それに応じて受圧面２５側へ
環状凸縁１９を押出するものである。In the case of FIG. 12, when forming the mounting groove 26, the pressure receiving surface 25 of the rim portion 17 of the piston material 90 is
An annular concave portion 67 having a hook-shaped cross section is formed on the annular surface 64 on the opposite side by partial pressing, and an annular convex edge 19 is accordingly extruded toward the pressure receiving surface 25 side.
【００３３】これらの成形法を適用すると、ピストン素
材９０ の製造において、図４の第１冷間加工装置を用
いる場合に比べてプレス荷重を低下させ、また装置の小
型化を図ることが可能である。[0033] By applying these forming methods, it is possible to reduce the press load and downsize the apparatus in manufacturing the piston material 90 compared to the case of using the first cold working apparatus shown in FIG. be.
【００３４】なお、取付溝２６が不要の場合には、第１
冷間加工装置によるピストン素材９０ の製造後、その
ピストン素材９０ に機械加工を施して両シール部材用
装着溝２１，２３の形成、面取り等が行われる。Note that if the mounting groove 26 is not required, the first
After the piston material 90 is manufactured using a cold working device, the piston material 90 is machined to form mounting grooves 21 and 23 for both seal members, chamfering, and the like.
【００３５】[0035]
【発明の効果】請求項１記載の発明によれば、冷間加工
であるバーリング加工および部分押込み加工を連続的に
行ってピストン素材の製造作業性を良好にすることが可
能であり、またピストン素材に対する機械加工は容易で
あるから、クラッチ用ピストンの製造能率を向上させて
その製造コストを低減することができる。According to the invention as claimed in claim 1, it is possible to improve the manufacturing workability of the piston material by continuously performing burring processing and partial pressing processing, which are cold workings, and to improve the workability of manufacturing the piston material. Since machining of the material is easy, the manufacturing efficiency of the clutch piston can be improved and the manufacturing cost can be reduced.
【００３６】請求項２記載の発明によれば、前記効果に
加え、リム部の厚肉化を達成して取付溝の成形を容易に
行うことができる。According to the second aspect of the present invention, in addition to the above-mentioned effects, the rim portion can be thickened and the mounting groove can be easily formed.
【図１】自動変速機用クラッチの縦断正面図である。FIG. 1 is a longitudinal sectional front view of a clutch for an automatic transmission.
【図２】図１の２矢視図に相当する、ピストンの要部側
面図である。FIG. 2 is a side view of the main parts of the piston, corresponding to the view taken along the arrow 2 in FIG. 1;
【図３】図２の３−３線断面図である。FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;
【図４】ブランクの縦断正面図である。FIG. 4 is a longitudinal sectional front view of the blank.
【図５】ピストン素材を製造するための第１冷間加工装
置の縦断正面図である。FIG. 5 is a longitudinal sectional front view of a first cold working device for producing a piston material.
【図６】バーリング加工を示す第１冷間加工装置の要部
縦断正面図である。FIG. 6 is a longitudinal sectional front view of the main part of the first cold working device showing burring processing.
【図７】部分押込み加工を示す第１冷間加工装置の要部
縦断正面図である。FIG. 7 is a longitudinal sectional front view of the main part of the first cold working device showing partial indentation processing.
【図８】取付溝を成形するための第２冷間加工装置の縦
断正面図である。FIG. 8 is a longitudinal sectional front view of a second cold working device for forming attachment grooves.
【図９】部分押込み加工を示す第２冷間加工装置の要部
縦断正面図である。FIG. 9 is a longitudinal sectional front view of the main part of the second cold working device showing partial indentation processing.
【図１０】取付溝成形法の他例を示すピストン素材の要
部縦断正面図である。FIG. 10 is a longitudinal sectional front view of a main part of a piston material showing another example of the mounting groove forming method.
【図１１】環状凸縁成形法の他例を示すピストン素材の
要部縦断正面図である。FIG. 11 is a longitudinal sectional front view of a main part of a piston material showing another example of the annular convex edge forming method.
【図１２】環状凸縁成形法のさらに他例を示すピストン
素材の要部縦断正面図である。FIG. 12 is a longitudinal sectional front view of a main part of a piston material showing still another example of the annular convex edge forming method.
２ クラッチハウジング３
外筒部
４ 内筒部
９ ピストン
９０ ピストン素材１０
油圧室
１６ ピストン本体１７
リム部
１８ ボス部
２１，２３ 環状溝
２５ 受圧面
２６ 取付溝
２８ リリーフポート３１
リード弁
５２ 下孔
５３ ブランク
５４ 小ボス部
Ｒ１ 内周領域
Ｒ２ 外周領域
ａ，ｂ 材料の流れ2 Clutch housing 3
Outer cylinder part 4 Inner cylinder part 9 Piston 90 Piston material 10
Hydraulic chamber 16 Piston body 17
Rim portion 18 Boss portions 21, 23 Annular groove 25 Pressure receiving surface 26 Mounting groove 28 Relief port 31
Reed valve 52 Pilot hole 53 Blank 54 Small boss R1 Inner area R2 Outer area a, b Material flow
Claims (2)
縁に、そのピストン本体（１６）よりも厚肉に形成され
てクラッチハウジング（２）の外筒部（３）内周面を摺
動するリム部（１７）を連設し、また前記ピストン本体
（１６）内周縁に、そのピストン本体（１６）よりも厚
肉に形成されて前記クラッチハウジング（２）の前記外
筒部（３）と同心の内筒部（４）外周面を摺動するボス
部（１８）を連設し、前記リム部（１７）外周面および
前記ボス部（１８）内周面にそれぞれシール部材装着用
環状溝（２１，２３）を設けたクラッチ用ピストンを製
造するに当り、円板状ブランク（５３）中心部の下孔（
５２）周辺部にバーリング加工を施して前記ボス部（１
８）よりも軸方向長さの短い小ボス部（５４）を成形し
、次いで前記小ボス部（５４）外周面に隣接する前記ブ
ランク（５３）の内周領域（Ｒ１ ）に、その領域（Ｒ
１ ）を軸方向に加圧する部分押込み加工を施して、前
記内周領域（Ｒ１ ）の肉厚を減少させることにより前
記ピストン本体（１６）を成形し、同時に前記肉厚の減
少に伴う半径方向外方への材料の流れ（ａ）により前記
ブランク（５３）の外周領域（Ｒ２）の肉厚を増加させ
て前記リム部（１７）を成形し、また前記肉厚の減少に
伴う軸方向への材料の流れ（ｂ）により前記小ボス部（
５４）を伸長させて前記ボス部（１８）を成形すること
によってピストン素材（９０ ）を製造し、その後前記
ピストン素材（９０ ）に機械加工を施して前記両シー
ル部材装着用環状溝（２１，２２）を形成することを特
徴とするクラッチ用ピストンの製造方法。[Claim 1] An annular disc-shaped piston body (16) formed on the outer periphery with a wall thicker than the piston body (16) so as to slide on the inner periphery of the outer cylindrical part (3) of the clutch housing (2). The outer cylindrical portion (3) of the clutch housing (2) is provided with a rim portion (17) that is thicker than the piston body (16) on the inner peripheral edge of the piston body (16). A boss part (18) that slides on the outer peripheral surface of the inner cylindrical part (4) concentric with the rim part (17) and an inner peripheral surface of the boss part (18) are respectively provided with an annular shape for attaching a seal member. When manufacturing a clutch piston provided with grooves (21, 23), a prepared hole (
52) Perform burring on the peripheral portion to form the boss portion (1)
A small boss portion (54) having a shorter axial length than the small boss portion (54) is formed, and then a mold is formed on the inner circumferential region (R1) of the blank (53) adjacent to the outer circumferential surface of the small boss portion (54). R
1) is applied in the axial direction to form the piston body (16) by reducing the wall thickness of the inner circumferential region (R1), and at the same time, the radial direction due to the decrease in the wall thickness is The outward material flow (a) increases the wall thickness of the outer circumferential region (R2) of the blank (53) to form the rim portion (17), and also axially as the wall thickness decreases. Due to the material flow (b), the small boss part (
A piston material (90) is manufactured by extending the piston material (90) to form the boss portion (18), and then machining the piston material (90) to form the annular grooves (21, 54) for attaching both seal members. 22) A method for manufacturing a clutch piston, comprising:
縁に、そのピストン本体（１６）よりも厚肉に形成され
てクラッチハウジング（２）の外筒部（３）内周面を摺
動するリム部（１７）を連設し、また前記ピストン本体
（１６）内周縁に、そのピストン本体（１６）よりも厚
肉に形成されて前記クラッチハウジング（２）の前記外
筒部（３）と同心の内筒部（４）外周面を摺動するボス
部（１８）を連設し、クラッチ用油圧室（１０）に臨む
受圧面（２５）に、その受圧面（２５）に開口するリリ
ーフポート（２８）を開閉するリード弁（３１）を取付
けるべく、半径方向外方に向って深さを増す取付溝（２
６）を備え、前記リム部（１７）外周面および前記ボス
部（１８）内周面にそれぞれシール部材装着用環状溝（
２１，２３）を設けたクラッチ用ピストンを製造するに
当り、円板状ブランク（５３）中心部の下孔（５２）周
辺部にバーリング加工を施して前記ボス部（１８）より
も軸方向長さの短い小ボス部（５４）を成形し、次いで
前記小ボス部（５４）外周面に隣接する前記ブランク（
５３）の内周領域（Ｒ１ ）に、その領域（Ｒ１ ）を
軸方向に加圧する部分押込み加工を施して、前記内周領
域（Ｒ１ ）の肉厚を減少させることにより前記ピスト
ン本体（１６）を成形し、同時に前記肉厚の減少に伴う
半径方向外方への材料の流れ（ａ）により前記ブランク
（５３）の外周領域（Ｒ２ ）の肉厚を増加させて、前
記取付溝（２６）の半径方向外方端側を形成し得る半径
方向幅と肉厚を備えた前記リム部（１７）を成形し、ま
た前記肉厚の減少に伴う軸方向への材料の流れ（ｂ）に
より前記小ボス部（５４）を伸長させて前記ボス部（１
８）を成形することによってピストン素材（９０ ）を
製造する工程と、前記ピストン素材（９０ ）の前記ピ
ストン本体（１６）および前記リム部（１７）に部分押
込み加工を施して前記取付溝（２６）を成形する工程と
、前記ピストン素材（９０ ）に機械加工を施して前記
両シール部材装着用環状溝（２１，２２）を形成する工
程とを順次行うことを特徴とするクラッチ用ピストンの
製造方法。[Claim 2] An annular disk-shaped piston body (16) is formed on the outer circumferential edge to be thicker than the piston body (16) and slides on the inner circumferential surface of the outer cylindrical part (3) of the clutch housing (2). The outer cylindrical portion (3) of the clutch housing (2) is provided with a rim portion (17) that is thicker than the piston body (16) on the inner peripheral edge of the piston body (16). A boss part (18) that slides on the outer circumferential surface of the inner cylinder part (4) concentric with the inner cylinder part (4) is arranged in series, and the boss part (18) is opened to the pressure receiving surface (25) facing the clutch hydraulic chamber (10). In order to install the reed valve (31) that opens and closes the relief port (28), the mounting groove (2) increases in depth radially outward.
6), and an annular groove for attaching a seal member (
21, 23), the periphery of the pilot hole (52) in the center of the disc-shaped blank (53) is burred to make it longer than the boss (18) in the axial direction. A short small boss portion (54) is formed, and then the blank (54) adjacent to the outer peripheral surface of the small boss portion (54) is formed.
53) is subjected to a partial indentation process to pressurize the area (R1) in the axial direction to reduce the wall thickness of the inner circumferential area (R1), thereby forming the piston body (16). At the same time, the wall thickness of the outer circumferential region (R2) of the blank (53) is increased due to the radially outward material flow (a) accompanying the decrease in the wall thickness, and the mounting groove (26) is formed. The rim portion (17) is formed with a radial width and wall thickness capable of forming the radially outer end side of the The small boss portion (54) is extended to form the boss portion (1).
8) to produce a piston material (90) by molding the piston material (90), and partially indenting the piston body (16) and the rim portion (17) of the piston material (90) to form the mounting groove (26). ), and a step of machining the piston material (90) to form the annular grooves (21, 22) for mounting both seal members, in this order. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3028709A JP2884443B2 (en) | 1991-02-22 | 1991-02-22 | Manufacturing method of clutch piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3028709A JP2884443B2 (en) | 1991-02-22 | 1991-02-22 | Manufacturing method of clutch piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04266444A true JPH04266444A (en) | 1992-09-22 |
| JP2884443B2 JP2884443B2 (en) | 1999-04-19 |
Family
ID=12255987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3028709A Expired - Fee Related JP2884443B2 (en) | 1991-02-22 | 1991-02-22 | Manufacturing method of clutch piston |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2884443B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0662261U (en) * | 1993-02-09 | 1994-09-02 | 株式会社ユタカ技研 | Clutch piston valve structure |
| JPH0662264U (en) * | 1993-02-12 | 1994-09-02 | 株式会社ユタカ技研 | Mounting structure for stopper plate on clutch piston |
| JP2008036699A (en) * | 2006-08-09 | 2008-02-21 | Univ Of Fukui | Thin wall metallic structure, and method of and apparatus for forging thin metallic plate |
| JP2012188019A (en) * | 2011-03-10 | 2012-10-04 | Yokohama Rubber Co Ltd:The | Tire state acquisition device, and tire condition monitoring system |
| JP6278092B1 (en) * | 2016-10-21 | 2018-02-14 | マツダ株式会社 | Friction fastening device for automatic transmission |
-
1991
- 1991-02-22 JP JP3028709A patent/JP2884443B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0662261U (en) * | 1993-02-09 | 1994-09-02 | 株式会社ユタカ技研 | Clutch piston valve structure |
| JPH0662264U (en) * | 1993-02-12 | 1994-09-02 | 株式会社ユタカ技研 | Mounting structure for stopper plate on clutch piston |
| JP2008036699A (en) * | 2006-08-09 | 2008-02-21 | Univ Of Fukui | Thin wall metallic structure, and method of and apparatus for forging thin metallic plate |
| JP2012188019A (en) * | 2011-03-10 | 2012-10-04 | Yokohama Rubber Co Ltd:The | Tire state acquisition device, and tire condition monitoring system |
| JP6278092B1 (en) * | 2016-10-21 | 2018-02-14 | マツダ株式会社 | Friction fastening device for automatic transmission |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2884443B2 (en) | 1999-04-19 |
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