JP3738482B2 - Connection structure of plate and shaft - Google Patents

Connection structure of plate and shaft Download PDF

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Publication number
JP3738482B2
JP3738482B2 JP10582696A JP10582696A JP3738482B2 JP 3738482 B2 JP3738482 B2 JP 3738482B2 JP 10582696 A JP10582696 A JP 10582696A JP 10582696 A JP10582696 A JP 10582696A JP 3738482 B2 JP3738482 B2 JP 3738482B2
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Japan
Prior art keywords
plate
shaft
serration
shell
plastic deformation
Prior art date
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Expired - Fee Related
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JP10582696A
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Japanese (ja)
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JPH09291921A (en
Inventor
田 公 山
川 典 男 西
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Aisin Corp
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Aisin Seiki Co Ltd
Aisin Corp
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Priority to JP10582696A priority Critical patent/JP3738482B2/en
Publication of JPH09291921A publication Critical patent/JPH09291921A/en
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【０００１】
【産業上の利用分野】
この出願の発明は、板と軸の結合装置に関するものであり、例えばブレーキ倍力装置のシェルと取付ボルトとの結合構造に適用される。
【０００２】
【従来の技術】
特公昭５２−３１２６６号公報には、ボルト軸部の基部に形成したセレーション部を取付板に形成した貫通孔に圧入してボルトのセレーション部を取付板に食い込ませ、ボルト頭部端面を取付板の一側面に当接させた状態にてボルトのセレーション部を取付板の他側面から塑性変形させ、その塑性変形部と頭部端面とでボルトを取付板に挟着固定することにより、ボルトを取付板に対し相対回転不可能に且つ気密に連結する連結構造が記載されている。
【０００３】
【発明が解決しようとする課題】
このような連結構造において、取付板に対するボルトの回り止め強度と気密性はボルトのセレーション部の塑性変形量（塑性変形させる長さ）を大きくすることで良くなるが、ボルトの塑性変形部とボルトの頭部座面との間に挟み込まれた取付板の材料の逃げ場がなくなり、塑性変形部におれ込みが発生して塑性変形部の付け根部の肉厚が薄くなり、取付板に対するボルトの抜け強度が悪くなる。ボルトの抜け強度を良くするためにセレーション部の塑性変形量を小さくすると、取付板に対するボルトの回り止め強度と気密性が悪くなる。
【０００４】
この出願の発明は、取付板に対するボルトの回り止め強度と気密性を良くするためにボルトのセレーション部の塑性変形量を大きくしても取付板に対するボルトの抜け強度が悪くならないようにすることを目的とする。
【０００５】
【課題を解決するための手段】
上記の目的に従うこの出願の発明に係る板と軸との連結構造は、請求項１に記載したように、軸の一端に頭部を形成するとともにこの軸の一端部にセレーション部を形成し、前記軸の前記セレーション部を軸と連結すべき板に形成した貫通孔に圧入してセレーション部を板に食い込ませ、前記軸の前記頭部の座面を前記板の一側面に当接させた状態にて前記セレーション部を前記板の他側面から塑性変形させ、その塑性変形部と前記頭部の座面とで前記軸を前記板に挟着固定させた板と軸との連結構造であって、前記軸の前記座面の内周部に第１凹部を形成し、この第１凹部の内周部にその外周部より深い、前記セレーション部を塑性変形させた際に前記板の前記貫通孔の周縁部を入り込ませるための環状凹部を形成したものである。
【０００６】
このような構造においては、前記セレーション部を塑性変形させた際に前記板の前記孔の周縁部が前記軸の頭部の座面の環状凹部に入り込むことで塑性変形部におれ込みが発生することが回避されるので、軸のセレーション部の塑性変形量を大きくして取付板に対する軸の回り止め強度と気密性を良くし、同時に取付板に対する軸の抜け強度も良くすることができる。
【０００７】
また、請求項２に記載したように、前記板の前記貫通孔の周縁部を前記環状凹部に入り込ませた状態では前記環状凹部の入口の環状角部を前記板に食い込ませるようにすることで、軸の回り止め強度と気密性を更に良くすることができる。
【０００８】
【発明の実施の形態】
以下、この出願に係る板と軸との連結構造の一実施形態について図１〜図３を参照して説明する。
【０００９】
図１〜図３により示す一実施形態はブレーキ倍力装置のシェル１０と車体への取付ボルト１２との結合構造であり、図１は結合構造の完成状態の断面図であり、図２はシェル１０と取付ボルト１２を連結する工程の取付ボルト１２のセレーション部１２ａを塑性変形させる直前の状態を示す図であり、図３はセレーション部１２ａの塑性変形完了時の状態を示す要部拡大図である。
【００１０】
シェル１０には取付ボルト１２の軸部１２ｂを挿通する貫通孔１０ａが形成されている。この貫通孔１０ａの周縁部１０ｂは上側（シェル１０の内側）に突出されている。取付ボルト１２の軸部１２ｂの上端には頭部１２ｃが一体に形成されており、軸部１２ｂの上端部にはセレーション部１２ａが形成されている。このセレーション部１２ａの外径は貫通孔１０ａの内径よりも大きい。取付ボルト１２の頭部１２ｃの座面１２ｄにはシェル１０の貫通孔周縁部１０ｂを収容させるための第１凹部１２ｅが形成され、この第１凹部１２ｅの内周部には環状凹部１２ｆが形成されている。この環状凹部１２ｆの入口にはシャープな環状角部１２ｇが形成されている。
【００１１】
シェル１０と取付ボルト１２との連結は、図１のように、先ずシェル１０をスプリング１４により支持されたストリッパー１６の上に置き、次いで取付ボルト１２の軸部１２ｂをシェル１０の上方から貫通孔１０ａに挿通する。その後、取付ボルト１２の頭部１０ｃの上方にあるパンチ１８を下降させて取付ボルト１２を下方へ押させる。パンチ１８の下降過程において、先ずスプリング１４の力により取付ボルト１２のセレーション部１２ａを貫通孔１０ａに圧入させ、セレーション部１２ａをシェル１０に食い込ませ且つストリッパー１６とパンチ１８とでシェル１０を挟着し拘束させる。続いて、シェル１０、取付ボルト１２、ストリッパー１６およびパンチ１８の一体的な下降によりセレーション部１２ａの下端をダイス２０に当接させ、セレーション部１２ａを下端から塑性変形させて膨径した塑性変形部１２ｈを形成し、この塑性変形部１２ｈと頭部１２ｃとでシェル１０を挟着固定させる。
【００１２】
シェル１０に対する取付ボルト１２の回り止めは、基本的にはセレーション部１２ａがシェル１０に食い込むことにより達成される。また、シェル１０と取付ボルト１２と間の気密性は、基本的にはシェル１０と塑性変形部１２ｈと接触により達成される。塑性変形部１２ｈを形成する際、シェル１０の貫通孔１０ａの周縁部が図３のように環状凹部１２ｆに入り込む。これにより、塑性変形部１２ｈにおれ込みが発生すること回避され、シェル１０に対する取付ボルト１２の抜け強度が確保される。そして、環状凹部１２ｆの入口のシャープな環状角部１２ｇがシェル１０に食い込むことにより、シェル１０に対する取付ボルト１２の回り止め強度が向上し、同時にシェル１０と取付ボルト１２と間の気密性が向上する。
【００１３】
尚、貫通孔周縁部１０ｂが上側に突出されているのは、塑性変形部１２ｈの上端がシェル１０の上面から上方へ突出しないようにするためであり、塑性変形部１２ｈの上端がシェル１０の上面から上方へ突出しても良い場合には省略することができる。
【００１４】
【発明の効果】
この出願の発明に係る板と軸との連結構造においては、板に対する軸の回り止め強度と気密性が良く、且つ、板に対する軸の抜け強度も良いと言う優れた効果が得られる。
【図面の簡単な説明】
【図１】この出願の発明の一実施形態の完成状態の断面図である。
【図２】図１のシェルと取付ボルトとを連結する工程の取付ボルトのセレーション部を塑性変形させる直前の状態を示す図である。
【図３】セレーション部の塑性変形完了時の状態を示す要部拡大図である。
【符号の説明】
１０・・・シェル（板）
１２・・・取付ボルト（軸）
１２ａ・・・セレーション部
１２ｂ・・・軸部
１２ｃ・・・頭部
１２ｄ・・・座面
１２ｅ・・・第１凹部
１２ｆ・・・環状凹部
１２ｇ・・・環状角部
１２ｈ・・・塑性変形部
１４・・・スプリング
１６・・・ストリッパー
１８・・・パンチ
２０・・・ダイス[0001]
[Industrial application fields]
The invention of this application relates to a plate / shaft coupling device, and is applied to, for example, a coupling structure between a shell and a mounting bolt of a brake booster.
[0002]
[Prior art]
In Japanese Patent Publication No. 52-31266, a serration portion formed at a base portion of a bolt shaft portion is press-fitted into a through hole formed in a mounting plate so that the bolt serration portion bites into the mounting plate, and a bolt head end surface is attached to the mounting plate. The bolt serrations are plastically deformed from the other side of the mounting plate in contact with one side, and the bolts are clamped and fixed to the mounting plate by the plastic deformations and the head end surface. A connection structure is described in which a relative rotation with respect to the mounting plate is impossible and airtightly connected.
[0003]
[Problems to be solved by the invention]
In such a connection structure, the bolt's detent strength and airtightness with respect to the mounting plate can be improved by increasing the amount of plastic deformation (the length of plastic deformation) of the bolt serration part. The material of the mounting plate sandwiched between the head and the seat surface of the mounting plate disappears, and the plastic deformation part is entrapped, the thickness of the base part of the plastic deformation part is reduced, and the bolts are removed from the mounting plate. The strength becomes worse. If the amount of plastic deformation of the serration portion is reduced in order to improve the bolt pull-out strength, the bolt detent strength and airtightness with respect to the mounting plate are deteriorated.
[0004]
The invention of this application is to prevent the bolt pullout strength against the mounting plate from deteriorating even if the amount of plastic deformation of the bolt serration portion is increased in order to improve the detent strength and airtightness of the bolt with respect to the mounting plate. Objective.
[0005]
[Means for Solving the Problems]
According to the above-mentioned object, the connection structure between the plate and the shaft according to the invention of the present application forms a head at one end of the shaft and a serration portion at one end of the shaft, as described in claim 1, The serration portion of the shaft is press-fitted into a through hole formed in a plate to be connected to the shaft so that the serration portion is bitten into the plate, and the seating surface of the head portion of the shaft is brought into contact with one side surface of the plate In this state, the serration portion is plastically deformed from the other side of the plate, and the shaft is connected to the plate by the plastic deformation portion and the seating surface of the head. A first recess is formed in the inner periphery of the seat surface of the shaft, and the plate penetrates the serration when the serration is deeply deformed in the inner periphery of the first recess. An annular recess is formed to allow the peripheral edge of the hole to enter.
[0006]
In such a structure, when the serration portion is plastically deformed, the peripheral portion of the hole of the plate enters the annular recess of the seating surface of the head portion of the shaft, so that the plastic deformation portion is entrained. Therefore, the amount of plastic deformation of the serration portion of the shaft can be increased to improve the shaft detent strength and airtightness with respect to the mounting plate, and at the same time, the shaft pull-out strength with respect to the mounting plate can be improved.
[0007]
According to a second aspect of the present invention, in the state where the peripheral edge portion of the through hole of the plate is inserted into the annular recess, the annular corner portion of the inlet of the annular recess is bitten into the plate. Further, it is possible to further improve the shaft detent strength and airtightness.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a connection structure between a plate and a shaft according to this application will be described with reference to FIGS.
[0009]
1 to 3 show a coupling structure of a shell 10 of a brake booster and a mounting bolt 12 to a vehicle body, FIG. 1 is a sectional view of the coupling structure in a completed state, and FIG. 10 is a view showing a state immediately before plastic deformation of the serration portion 12a of the mounting bolt 12 in the step of connecting the mounting bolt 12 and the mounting bolt 12, and FIG. 3 is an enlarged view of a main portion showing a state when the plastic deformation of the serration portion 12a is completed. is there.
[0010]
The shell 10 is formed with a through hole 10 a through which the shaft portion 12 b of the mounting bolt 12 is inserted. The peripheral edge portion 10b of the through hole 10a protrudes upward (inside the shell 10). A head portion 12c is integrally formed at the upper end of the shaft portion 12b of the mounting bolt 12, and a serration portion 12a is formed at the upper end portion of the shaft portion 12b. The outer diameter of the serration portion 12a is larger than the inner diameter of the through hole 10a. A first recess 12e for accommodating the through hole peripheral edge portion 10b of the shell 10 is formed on the seating surface 12d of the head 12c of the mounting bolt 12, and an annular recess 12f is formed on the inner peripheral portion of the first recess 12e. Has been. A sharp annular corner 12g is formed at the entrance of the annular recess 12f.
[0011]
As shown in FIG. 1, first, the shell 10 is placed on a stripper 16 supported by a spring 14, and then the shaft portion 12 b of the mounting bolt 12 is inserted into the through hole from above the shell 10. Insert 10a. Thereafter, the punch 18 above the head portion 10c of the mounting bolt 12 is lowered to push the mounting bolt 12 downward. In the lowering process of the punch 18, first, the serration portion 12 a of the mounting bolt 12 is press-fitted into the through hole 10 a by the force of the spring 14, the serration portion 12 a is bitten into the shell 10, and the shell 10 is sandwiched between the stripper 16 and the punch 18. And restrain it. Subsequently, the plastic deformation portion in which the lower end of the serration portion 12a is brought into contact with the die 20 by the integral lowering of the shell 10, the mounting bolt 12, the stripper 16, and the punch 18, and the serration portion 12a is plastically deformed from the lower end to expand the diameter. 12h is formed, and the shell 10 is clamped and fixed between the plastic deformation portion 12h and the head portion 12c.
[0012]
The detent of the mounting bolt 12 with respect to the shell 10 is basically achieved by the serration portion 12 a biting into the shell 10. Further, the airtightness between the shell 10 and the mounting bolt 12 is basically achieved by contact between the shell 10 and the plastic deformation portion 12h. When forming the plastic deformation portion 12h, the peripheral edge portion of the through hole 10a of the shell 10 enters the annular recess 12f as shown in FIG. Thereby, it is avoided that the plastic deformation part 12h is entrained, and the pull-out strength of the mounting bolt 12 with respect to the shell 10 is ensured. Then, the sharp annular corner 12g at the entrance of the annular recess 12f bites into the shell 10, thereby improving the detent strength of the mounting bolt 12 with respect to the shell 10, and at the same time improving the airtightness between the shell 10 and the mounting bolt 12. To do.
[0013]
The through hole peripheral edge portion 10b protrudes upward so that the upper end of the plastic deformation portion 12h does not protrude upward from the upper surface of the shell 10, and the upper end of the plastic deformation portion 12h extends from the shell 10. If it is possible to project upward from the upper surface, it can be omitted.
[0014]
【The invention's effect】
In the connection structure between the plate and the shaft according to the invention of this application, an excellent effect is obtained that the rotation prevention strength and airtightness of the shaft with respect to the plate are good, and the shaft pull-out strength with respect to the plate is also good.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a completed state of an embodiment of the invention of this application.
2 is a view showing a state immediately before plastically deforming a serration portion of a mounting bolt in a process of connecting the shell and the mounting bolt in FIG. 1; FIG.
FIG. 3 is a main part enlarged view showing a state when plastic deformation of a serration part is completed.
[Explanation of symbols]
10 ... Shell (plate)
12 ... Mounting bolt (shaft)
12a ... Serration part 12b ... Shaft part 12c ... Head part 12d ... Seat surface 12e ... 1st recessed part 12f ... Annular recessed part 12g ... Annular corner part 12h ... Plastic deformation Part 14 ... Spring 16 ... Stripper 18 ... Punch 20 ... Die

Claims (2)

軸の一端に頭部を形成するとともにこの軸の一端部にセレーション部を形成し、前記軸の前記セレーション部を前記軸と連結すべき板に形成された貫通孔に圧入して前記セレーション部を前記板に食い込ませ、前記軸の前記頭部の座面を前記板の一側面に当接させた状態にて前記セレーション部を前記板の他側面から塑性変形させ、その塑性変形部と前記頭部の座面とで前記軸を前記板に挟着固定させた板と軸との連結構造において、
前記軸の前記座面の内周部に第１凹部を形成し、この第１凹部の内周部にその外周部より深い、前記セレーション部を塑性変形させた際に前記板の前記貫通孔の周縁部を入り込ませるための環状凹部を形成したことを特徴とする板と軸との連結構造。A head is formed at one end of the shaft, a serration portion is formed at one end of the shaft, and the serration portion of the shaft is press-fitted into a through hole formed in a plate to be connected to the shaft. The serration portion is plastically deformed from the other side surface of the plate in a state where the plate bites into the plate and the seating surface of the head of the shaft is in contact with one side surface of the plate, and the plastic deformation portion and the head In the connecting structure of the plate and the shaft in which the shaft is clamped and fixed to the plate with the seating surface of the part,
A first recess is formed in the inner peripheral portion of the seat surface of the shaft, and when the serration portion is plastically deformed deeper than the outer peripheral portion in the inner peripheral portion of the first recess, the through hole of the plate is formed. A connecting structure of a plate and a shaft, characterized in that an annular recess is formed to allow the peripheral edge to enter. 請求項１に記載の板と軸との連結構造であって、前記板の前記貫通孔の周縁部を前記環状凹部に入り込ませた状態では前記環状凹部の入口の環状角部を前記板に食い込ませたことを特徴とする板と軸との連結構造。  2. The connection structure between a plate and a shaft according to claim 1, wherein an annular corner portion of the inlet of the annular recess is bitten into the plate in a state in which a peripheral edge portion of the through hole of the plate enters the annular recess. A connecting structure between a plate and a shaft, characterized in that
JP10582696A 1996-04-25 1996-04-25 Connection structure of plate and shaft Expired - Fee Related JP3738482B2 (en)

Priority Applications (1)

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JP10582696A JP3738482B2 (en) 1996-04-25 1996-04-25 Connection structure of plate and shaft

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JP10582696A JP3738482B2 (en) 1996-04-25 1996-04-25 Connection structure of plate and shaft

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JPH09291921A JPH09291921A (en) 1997-11-11
JP3738482B2 true JP3738482B2 (en) 2006-01-25

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KR100440879B1 (en) * 2001-04-25 2004-07-19 한국델파이주식회사 Stud bolt of alternator for vehicle
JP4834027B2 (en) * 2008-04-07 2011-12-07 セキ工業株式会社 Caulking screw, caulking screw manufacturing method, and caulking screw joining structure

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