JP2014057970A - Member to be welded, gear and transmission gear - Google Patents

Member to be welded, gear and transmission gear Download PDF

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JP2014057970A
JP2014057970A JP2012202789A JP2012202789A JP2014057970A JP 2014057970 A JP2014057970 A JP 2014057970A JP 2012202789 A JP2012202789 A JP 2012202789A JP 2012202789 A JP2012202789 A JP 2012202789A JP 2014057970 A JP2014057970 A JP 2014057970A
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electron beam
corner
gear
stress concentration
relief
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JP6502608B2 (en
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Masanori Yamagishi
正典 山岸
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Subaru Corp
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Fuji Heavy Industries Ltd
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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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
    • F16D23/02—Arrangements for synchronisation, also for power-operated clutches
    • F16D23/025—Synchro rings
    • 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
    • F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
    • F16D23/02—Arrangements for synchronisation, also for power-operated clutches
    • F16D23/04—Arrangements for synchronisation, also for power-operated clutches with an additional friction clutch
    • F16D23/06—Arrangements for synchronisation, also for power-operated clutches with an additional friction clutch and a blocking mechanism preventing the engagement of the main clutch prior to synchronisation
    • F16D2023/0625—Details of members being coupled, e.g. gears

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gears, Cams (AREA)
  • Gear-Shifting Mechanisms (AREA)
  • Welding Or Cutting Using Electron Beams (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a gear capable of relaxing concentration of stress on a corner part even when the corner part is affected by a thermal effect due to electron beam welding.SOLUTION: A main gear 10 has a corner R part 13 in the incident direction EB of an electron beam applied on electron beam welding. The corner R part 13 is formed in a stepped form. The stepped corner R part 13 has a relief part 11 dented in a circular arc form in the incident direction EB of the electron beam and a stress concentration relaxing part 12 connected smoothly to the relief part 11 and bent concavely. The stress concentration relaxing part 12 is deeper than the relief part 11 in the incident direction EB of the electron beam or has a larger diameter of R.

Description

本発明は、被溶接部材、ギヤ、及び、トランスミッションギヤに関する。   The present invention relates to a member to be welded, a gear, and a transmission gear.

従来から、溶接方法の一つとして、真空中でフィラメントを加熱することにより放出される熱電子を高電圧で加速させてビームとし、この高速の電子ビームを電磁レンズで絞って母材（被溶接部材）に衝突させ、その際に生じる衝撃発熱を利用して溶接を行う電子ビーム溶接（ＥＢＷ：Ｅｌｅｃｔｒｏｎ Ｂｅａｍ Ｗｅｌｄｉｎｇ）が知られている。この電子ビーム溶接は、他の溶接方法と比較して、被溶接部材に狭い範囲で深い箇所まで溶接を行うことができるという特徴を有している。   Conventionally, as one of the welding methods, the thermoelectrons emitted by heating the filament in vacuum are accelerated to a beam by a high voltage, and this high-speed electron beam is squeezed with an electromagnetic lens (base material to be welded). Electron beam welding (EBW) is known in which welding is performed using impact heat generated at the time of collision with a member). This electron beam welding is characterized in that welding can be performed to a deep part in a narrow range on a member to be welded, as compared with other welding methods.

ここで、特許文献１には、メインギヤにシンクロ用のクラッチギヤを挿入して、電子ビーム溶接により一体化する変速機用歯車の製造方法が開示されている。より詳細には、この製造方法によれば、まず、メインギヤの外周接合面にクラッチギヤが挿入され、その後、該外周接合面から垂直に立ち上がるメインギヤの当接面とクラッチギヤの背側接合面とが電子ビーム溶接で溶接され、クラッチギヤがメインギヤと一体化される。   Here, Patent Document 1 discloses a method of manufacturing a transmission gear in which a synchronization clutch gear is inserted into a main gear and integrated by electron beam welding. More specifically, according to this manufacturing method, first, the clutch gear is inserted into the outer peripheral joint surface of the main gear, and then, the contact surface of the main gear that rises perpendicularly from the outer peripheral joint surface and the back side joint surface of the clutch gear. Are welded by electron beam welding, and the clutch gear is integrated with the main gear.

特開２００４−１１８１６号公報JP 2004-11816 A

ところで、上記変速機用歯車（メインギヤ）の溶接部では、電子ビームの入射方向に隅部（上記外周接合面と当接面とが交わる部位）があるため、メインギヤの逃げ形状部（隅Ｒ部）に電子ビーム溶接の熱影響が及ぶことが有り得る。その場合、逃げ形状である隅Ｒ部が熱によって変形することにより、当該部位が応力集中部位となるおそれがある。   By the way, in the welded portion of the transmission gear (main gear), there is a corner portion (a portion where the outer peripheral joint surface and the contact surface intersect) in the incident direction of the electron beam. ) May be affected by the heat of electron beam welding. In that case, the corner R portion, which is a relief shape, is deformed by heat, so that the portion may become a stress concentration portion.

特に、変速機用歯車では、トルク伝達強度を満足するだけの溶接深さが必要となるが、例えば、レイアウトや製造上の要件等から溶接可能範囲（溶接深さ）に余裕がない場合、電子ビーム溶接の溶接深さばらつきによって電子ビーム溶接の熱影響が隅Ｒ部にかかるおそれがある。このような場合、高応力発生部位である隅Ｒ部が電子ビーム溶接の熱影響によって変形して応力集中部位となり、該変形部位を起点にして破損が発生することが懸念される。   In particular, transmission gears require a welding depth that satisfies the torque transmission strength. For example, if there is no allowance in the weldable range (welding depth) due to layout or manufacturing requirements, etc. There is a possibility that the heat effect of electron beam welding is applied to the corner R portion due to the welding depth variation of the beam welding. In such a case, there is a concern that the corner R portion, which is a high stress generation site, is deformed due to the heat effect of electron beam welding to become a stress concentration site, and breakage occurs starting from the deformation site.

本発明は、上記問題点を解消する為になされたものであり、隅部が電子ビーム溶接による熱影響を受けたとしても、当該隅部への応力集中を緩和することが可能な被溶接部材、ギヤ、及び、トランスミッションギヤを提供することを目的とする。   The present invention has been made to solve the above problems, and even if the corner is affected by heat by electron beam welding, the member to be welded can alleviate stress concentration at the corner. An object is to provide a gear and a transmission gear.

本発明に係る被溶接部材は、電子ビーム溶接時に照射される電子ビームの入射方向に隅部を有する被溶接部材であって、隅部が、電子ビームの入射方向に窪んだ逃げ部と、逃げ部から連続して凹状に湾曲するように形成された応力集中緩和部とを有していることを特徴とする。   A member to be welded according to the present invention is a member to be welded having a corner portion in the incident direction of the electron beam irradiated during electron beam welding, and the corner portion has a relief portion recessed in the incident direction of the electron beam, and a relief portion. And a stress concentration alleviation part formed so as to be continuously concavely curved from the part.

本発明に係る被溶接部材によれば、被溶接部材の隅部が、逃げ部と応力集中緩和部とを含む段付き形状とされているため、電子ビーム溶接時に、逃げ部が電子ビームによる熱影響を受けたとしても、その熱影響が応力集中緩和部に及ぶことを防止することができる。よって、当該被溶接部材が、溶接された後に機器に組み込まれて使用される際に、凹状に湾曲するように形成された応力集中緩和部によって、高応力が隅部（逃げ部）に集中することを防止することができる。その結果、隅部（逃げ部）が電子ビーム溶接による熱影響を受けたとしても、当該隅部（逃げ部）への応力集中を緩和することが可能となる。   According to the member to be welded according to the present invention, since the corner of the member to be welded has a stepped shape including the relief portion and the stress concentration relaxation portion, the relief portion is heated by the electron beam during electron beam welding. Even if it is affected, it is possible to prevent the thermal effect from reaching the stress concentration relaxation part. Therefore, when the member to be welded is incorporated into an apparatus after being welded and used, high stress is concentrated on the corner (escape portion) by the stress concentration relaxation portion formed to be concavely curved. This can be prevented. As a result, even if the corner portion (relief portion) is affected by heat due to electron beam welding, the stress concentration on the corner portion (relief portion) can be reduced.

本発明に係るギヤは、電子ビーム溶接時に照射される電子ビームの入射方向に隅部を有するギヤであって、隅部が、電子ビームの入射方向に窪んだ逃げ部と、逃げ部から連続して凹状に湾曲するように形成された応力集中緩和部とを有していることを特徴とする。   The gear according to the present invention is a gear having a corner portion in the incident direction of the electron beam irradiated during electron beam welding, and the corner portion is continuous from the escape portion recessed in the incident direction of the electron beam and the escape portion. And a stress concentration relaxation portion formed so as to be curved in a concave shape.

本発明に係るギヤによれば、ギヤの隅部が、逃げ部と応力集中緩和部とを含む段付き形状とされているため、電子ビーム溶接時に、逃げ部が電子ビームによる熱影響を受けたとしても、その熱影響が応力集中緩和部に及ぶことを防止することができる。よって、当該ギヤが、溶接された後、機器に組み込まれて使用される際に、凹状に湾曲するように形成された応力集中緩和部によって、高応力が隅部（逃げ部）に集中することを防止することができる。その結果、隅部（逃げ部）が電子ビーム溶接による熱影響を受けたとしても、当該隅部（逃げ部）への応力集中を緩和することが可能となる。   According to the gear according to the present invention, since the corner portion of the gear has a stepped shape including the relief portion and the stress concentration relaxation portion, the relief portion was affected by heat due to the electron beam during electron beam welding. However, it is possible to prevent the thermal effect from reaching the stress concentration relaxation part. Therefore, when the gear is welded and then incorporated into a device, high stress is concentrated on the corner (relief portion) by the stress concentration relaxation portion formed to be concavely curved. Can be prevented. As a result, even if the corner portion (relief portion) is affected by heat due to electron beam welding, the stress concentration on the corner portion (relief portion) can be reduced.

本発明に係るギヤでは、逃げ部が、円弧状に形成され、応力集中緩和部が、逃げ部から滑らかに連続するように形成されていることが好ましい。このようにすれば、逃げ部及び応力集中緩和部の加工を比較的簡易に行うことができる。すなわち、逃げ部及び応力集中緩和部それぞれの機能を効果的に発揮できる形状を比較的簡易に形成することができる。   In the gear according to the present invention, it is preferable that the relief portion is formed in an arc shape and the stress concentration relaxation portion is formed so as to be smoothly continuous from the relief portion. If it does in this way, processing of a relief part and a stress concentration relaxation part can be performed comparatively simply. That is, it is possible to relatively easily form a shape that can effectively exhibit the functions of the relief portion and the stress concentration relaxation portion.

本発明に係るギヤでは、応力集中緩和部が、逃げ部よりも電子ビームの入射方向に対して深く形成されていることが好ましい。このようにすれば、隅部（逃げ部）が電子ビーム溶接の熱影響を受け、例えば変形したとしても、該隅部（逃げ部）への応力集中をより効果的に緩和することが可能となる。   In the gear according to the present invention, it is preferable that the stress concentration relaxation portion is formed deeper than the escape portion with respect to the incident direction of the electron beam. In this way, even if the corner (relief) is affected by the heat of electron beam welding and deforms, for example, it is possible to more effectively relieve stress concentration on the corner (relief). Become.

本発明に係るトランスミッションギヤは、上記いずれかのギヤと、該ギヤと電子ビーム溶接により一体化されたカップリングとを備えることを特徴とする。   A transmission gear according to the present invention includes any one of the above gears and a coupling integrated with the gear by electron beam welding.

本発明に係るトランスミッションギヤによれば、上記いずれかのギヤとカップリングとが電子ビーム溶接により一体化されている。よって、上述したように、ギヤとカップリングとが電子ビーム溶接される際に、該ギヤの隅部（逃げ部）が電子ビーム溶接による熱影響を受けたとしても、当該トランスミッションギヤがトランスミッションに組み込まれて使用される際に、ギヤの隅部（逃げ部）への応力集中を緩和することが可能となる。   According to the transmission gear according to the present invention, any of the above gears and the coupling are integrated by electron beam welding. Therefore, as described above, even when the gear and the coupling are subjected to electron beam welding, even if the corner portion (relief portion) of the gear is affected by heat due to electron beam welding, the transmission gear is incorporated into the transmission. When being used, it becomes possible to alleviate the stress concentration on the corner (relief) of the gear.

本発明によれば、隅部が電子ビーム溶接による熱影響を受けたとしても、当該隅部への応力集中を緩和することが可能となる。   According to the present invention, even if a corner is affected by heat due to electron beam welding, stress concentration on the corner can be reduced.

実施形態に係るトランスミッションギヤの構成を示す断面図である。It is sectional drawing which shows the structure of the transmission gear which concerns on embodiment. 実施形態に係るトランスミッションギヤ（メインギヤ）の隅部の強度解析結果を示す図である。It is a figure which shows the strength analysis result of the corner part of the transmission gear (main gear) which concerns on embodiment. 比較例に係る（従来形状の隅Ｒ部を有する）トランスミッションギヤの構成を示す断面図である。It is sectional drawing which shows the structure of the transmission gear which has a comparative example (it has the corner | angular R part of the conventional shape). 比較例に係る（従来形状の隅Ｒ部を有する）トランスミッションギヤの耐久試験後の溶接部の状態（耐久試験結果）を示す図である。It is a figure which shows the state (endurance test result) of the weld part after the endurance test of the transmission gear which has a corner R part of the related art which concerns on a comparative example. 比較例に係る（従来形状の隅Ｒ部を有する）トランスミッションギヤの他の耐久試験後の溶接部の状態（耐久試験結果）を示す図である。It is a figure which shows the state (endurance test result) of the welding part after the other endurance tests of the transmission gear which has a corner R part of the related art which concerns on a comparative example.

以下、図面を参照して本発明の好適な実施形態について詳細に説明する。なお、図中、同一又は相当部分には同一符号を用いることとする。また、各図において、同一要素には同一符号を付して重複する説明を省略する。なお、ここでは、被溶接部材として、自動車のマニュアルトランスミッションに用いられるトランスミッションギヤ（メインギヤ）を例にして説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals are used for the same or corresponding parts. Moreover, in each figure, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted. Here, a transmission gear (main gear) used in a manual transmission of an automobile will be described as an example of a member to be welded.

まず、図１を用いて、実施形態に係るトランスミッションギヤ１の構成について説明する。図１は、トランスミッションギヤ１の構成を示す断面図である。   First, the configuration of the transmission gear 1 according to the embodiment will be described with reference to FIG. FIG. 1 is a cross-sectional view showing the configuration of the transmission gear 1.

上述したように、トランスミッションギヤ１は、自動車のマニュアルトランスミッションに用いられるギヤであり、ギヤ（以下「メインギヤ」という）１０、及び、メインギヤ１０と電子ビーム溶接により一体化されたカップリング（以下「クラッチギヤ」という）２０を備える。   As described above, the transmission gear 1 is a gear used for a manual transmission of an automobile, and includes a gear (hereinafter referred to as “main gear”) 10 and a coupling (hereinafter referred to as “clutch”) integrated with the main gear 10 by electron beam welding. 20).

メインギヤ１０は、軸心方向に所定の厚みを持ち、外周部に歯部１４を有する円盤状の本体部１５と、本体部１５から軸心方向に突出する円筒状の円筒部１６とを備えている。メインギヤ１０には、軸心方向に貫通する軸孔１７が形成されており、トランスミッションに組み込まれる際には、該軸孔１７にメインシャフトが挿入される。   The main gear 10 includes a disc-shaped main body portion 15 having a predetermined thickness in the axial direction and having a tooth portion 14 on the outer peripheral portion, and a cylindrical cylindrical portion 16 protruding from the main body portion 15 in the axial direction. Yes. A shaft hole 17 penetrating in the axial direction is formed in the main gear 10, and the main shaft is inserted into the shaft hole 17 when incorporated in the transmission.

クラッチギヤ２０は、外周部にスプライン２１が形成された本体部２２と、本体部２２から軸心方向へ突出されたコーン部２３とを有している。クラッチギヤ２０には、メインギヤ１０の円筒部１６に外嵌可能な貫通孔が形成されている。   The clutch gear 20 has a main body portion 22 having a spline 21 formed on the outer peripheral portion, and a cone portion 23 protruding from the main body portion 22 in the axial direction. The clutch gear 20 is formed with a through hole that can be fitted onto the cylindrical portion 16 of the main gear 10.

メインギヤ１０とクラッチギヤ２０とを溶接する際には、まず、メインギヤ１０の円筒部１６にクラッチギヤ２０が嵌め込まれる。そして、メインギヤ１０の軸心方向と平行な方向（図１中の入射方向ＥＢ）から電子ビームが入射され、メインギヤ１０の円筒部１６の外周面と、クラッチギヤ２０の本体部２２（貫通孔）の内周面との接合面（溶接部）が全周にわたって溶接される。このようにして、メインギヤ１０とクラッチギヤ２０とが電子ビーム溶接により一体化される。   When welding the main gear 10 and the clutch gear 20, first, the clutch gear 20 is fitted into the cylindrical portion 16 of the main gear 10. An electron beam is incident from a direction parallel to the axial direction of the main gear 10 (incident direction EB in FIG. 1), and the outer peripheral surface of the cylindrical portion 16 of the main gear 10 and the main body portion 22 (through hole) of the clutch gear 20. The joint surface (welded portion) with the inner peripheral surface of the steel plate is welded over the entire periphery. In this way, the main gear 10 and the clutch gear 20 are integrated by electron beam welding.

上述したように、メインギヤ１０とクラッチギヤ２０とを電子ビーム溶接する際には、メインギヤ１０の軸心方向と平行な入射方向ＥＢから電子ビームが入射される。そのため、電子ビームの入射方向ＥＢの前方には、メインギヤ１０の本体部１５の側面と円筒部１６の外周面とによって画成される隅部（以下「隅Ｒ部」ともいう）１３が位置する。なお、該隅Ｒ部１３は、トランスミッションに組み込まれて使用される際に、応力が集中する部位となる。   As described above, when electron beam welding is performed on the main gear 10 and the clutch gear 20, the electron beam is incident from the incident direction EB parallel to the axial direction of the main gear 10. Therefore, a corner (hereinafter also referred to as “corner R portion”) 13 defined by the side surface of the main body portion 15 of the main gear 10 and the outer peripheral surface of the cylindrical portion 16 is positioned in front of the incident direction EB of the electron beam. . The corner R portion 13 is a portion where stress is concentrated when the corner R portion 13 is incorporated in a transmission.

ここで、メインギヤ１０の隅Ｒ部１３について説明する。図１の円内に拡大して示されるように、隅Ｒ部１３は、段付き形状に形成されている。すなわち、隅Ｒ部１３は、電子ビームの入射方向ＥＢに円弧状に窪んだ逃げ部１１と、逃げ部１１から滑らかに連続して凹状に湾曲するように形成された応力集中緩和部１２とを有して構成されている。   Here, the corner R portion 13 of the main gear 10 will be described. As shown enlarged in the circle of FIG. 1, the corner R portion 13 is formed in a stepped shape. That is, the corner R portion 13 includes a relief portion 11 that is recessed in an arc shape in the electron beam incident direction EB, and a stress concentration relaxation portion 12 that is formed so as to be smoothly and continuously curved from the relief portion 11 into a concave shape. It is configured.

また、応力集中緩和部１２は、逃げ部１１よりも、電子ビームの入射方向ＥＢ（軸心方向と同じ）に対して深く、すなわちＲの径が大きく形成されている。なお、図１では断面を示したが、隅Ｒ部１３は、円筒部１６の外縁に沿って、該円筒部１６の全周にわたって形成されている。   Further, the stress concentration relaxation portion 12 is deeper than the escape portion 11 in the electron beam incident direction EB (same as the axial direction), that is, has a larger R diameter. Although a cross section is shown in FIG. 1, the corner R portion 13 is formed along the outer edge of the cylindrical portion 16 over the entire circumference of the cylindrical portion 16.

隅Ｒ部１３が上述したような構成（段付き形状）を有することにより、電子ビーム溶接時に、電子ビームの入射方向ＥＢにある逃げ部１１が電子ビームによる熱影響を受けたとしても、その熱影響が応力集中緩和部１２に及ぶことが防止される。よって、当該メインギヤ１０が、クラッチギヤ２０と溶接され、トランスミッションに組み込まれて使用される際に、凹状に湾曲するように形成された応力集中緩和部１２によって、高応力が隅Ｒ部１３（逃げ部１１）に集中することが防止される。その結果、隅Ｒ部１３（逃げ部１１）が電子ビーム溶接による熱影響を受けたとしても、当該隅Ｒ部１３（逃げ部１１）への応力集中が緩和される。   Since the corner R portion 13 has the above-described configuration (stepped shape), even when the escape portion 11 in the electron beam incident direction EB is affected by heat due to the electron beam during electron beam welding, the heat The influence is prevented from reaching the stress concentration alleviating part 12. Therefore, when the main gear 10 is welded to the clutch gear 20 and incorporated in the transmission, the stress concentration relaxation portion 12 formed so as to be curved in a concave shape causes high stress to be generated at the corner R portion 13 (escape). Concentration on the part 11) is prevented. As a result, even if the corner R portion 13 (relief portion 11) is affected by heat due to electron beam welding, the stress concentration on the corner R portion 13 (relief portion 11) is alleviated.

続いて、隅Ｒ部１３を、逃げ部１１と応力集中緩和部１２からなる段付き形状としたことの効果を確認するために、隅Ｒ部１３の強度解析を行った。より詳細には、電子ビーム溶接の熱影響により隅Ｒ部１３の逃げ部１１が埋まった場合を想定し、該逃げ部１１を埋めて、従来（すなわち、応力集中緩和部１２を有しない場合）であれば応力が集中しやすくなる形状を模擬して強度解析を行った。その解析結果を図２に示す。ここで、図２は、トランスミッションギヤ１（メインギヤ１０）の隅Ｒ部１３の強度解析結果を示す図である。なお、図２中の濃淡は作用する応力の強さを示し、色が濃いほど応力が強いことを示している。   Subsequently, in order to confirm the effect of the corner R portion 13 having a stepped shape including the relief portion 11 and the stress concentration relaxation portion 12, strength analysis of the corner R portion 13 was performed. More specifically, assuming that the relief portion 11 of the corner R portion 13 is buried due to the heat effect of electron beam welding, the relief portion 11 is filled and the conventional (ie, the case where the stress concentration relaxation portion 12 is not provided). Then, the strength analysis was performed by simulating the shape where the stress tends to concentrate. The analysis result is shown in FIG. Here, FIG. 2 is a diagram showing the strength analysis result of the corner R portion 13 of the transmission gear 1 (main gear 10). Note that the shading in FIG. 2 indicates the strength of the applied stress, and the darker the color, the stronger the stress.

図２に示されるように、応力集中緩和部１２のＲ部で応力が分散されて緩和されるため、埋まった逃げ部１１に高い応力が集中しないことが確認された。よって、電子ビーム溶接の熱影響により隅Ｒ部１３の逃げ部１１が埋められたとしても、隅Ｒ部１３（逃げ部１１）に応力が集中することを緩和できることが確認された。   As shown in FIG. 2, since stress is dispersed and relaxed in the R portion of the stress concentration relaxation portion 12, it was confirmed that high stress does not concentrate in the buried relief portion 11. Therefore, it was confirmed that even if the relief portion 11 of the corner R portion 13 is filled due to the heat effect of electron beam welding, the stress concentration on the corner R portion 13 (escape portion 11) can be alleviated.

なお、比較例として、図３に示された従来の隅Ｒ部（すなわち段付き形状ではない隅Ｒ部）１１３を有するメインギヤ１１０とクラッチギヤ２０とを電子ビーム溶接したトランスミッションギヤ１００について耐久試験を行った。その試験結果を図４及び図５に示す。ここで、図３は、比較例に係る（従来形状の隅Ｒ部１１３を有する）トランスミッションギヤ１００の構成を示す断面図である。図４は、比較例に係る（従来形状の隅Ｒ部１１３を有する）トランスミッションギヤ１００の耐久試験後の溶接部の状態（耐久試験結果）を示す図である。また、図５は、比較例に係る（従来形状の隅Ｒ部１１３を有する）トランスミッションギヤ１００の他の耐久試験後の溶接部の状態（耐久試験結果）を示す図である。   As a comparative example, an endurance test was performed on the transmission gear 100 in which the main gear 110 having the conventional corner R portion (that is, the corner R portion not having a stepped shape) 113 shown in FIG. went. The test results are shown in FIGS. Here, FIG. 3 is a cross-sectional view showing a configuration of a transmission gear 100 according to a comparative example (having a conventional-shaped corner R portion 113). FIG. 4 is a diagram showing a state of a welded part (endurance test result) after the endurance test of the transmission gear 100 according to the comparative example (having a conventional corner R portion 113). FIG. 5 is a diagram showing a state of a welded part (endurance test result) after another endurance test of the transmission gear 100 according to the comparative example (having a conventional-shaped corner R portion 113).

図４に示されるように、比較例に係る（従来形状の隅Ｒ部１１３を有する）トランスミッションギヤ１００では、電子ビーム溶接の熱影響により隅Ｒ部１１３が変形して異常形状（突起形状）が生じ、該異常形状が応力集中部位となりクラックが発生した。また、図５に示されるように、比較例に係る（従来形状の隅Ｒ部１１３を有する）トランスミッションギヤ１００では、電子ビーム溶接の熱影響により隅Ｒ部１０１が略埋まってしまい、その部位を起点にクラックが発生した。   As shown in FIG. 4, in the transmission gear 100 according to the comparative example (having the conventional-shaped corner R portion 113), the corner R portion 113 is deformed due to the heat effect of electron beam welding and an abnormal shape (projection shape) is formed. As a result, the abnormal shape became a stress concentration site and a crack occurred. Further, as shown in FIG. 5, in the transmission gear 100 according to the comparative example (having the conventional-shaped corner R portion 113), the corner R portion 101 is substantially buried due to the heat effect of electron beam welding, and the portion is Cracks occurred at the starting point.

以上のように、本実施形態に係るメインギヤ１０によれば、隅Ｒ部１３を、逃げ部１１及び応力集中緩和部１２からなる段付き形状とすることにより、電子ビーム溶接による熱影響によって逃げ部１１が変形した場合であっても、応力集中緩和部１２のＲ部で応力が分散されて緩和されるため、逃げ部１１に高い応力が集中しないことが確認された。   As described above, according to the main gear 10 according to the present embodiment, the corner R portion 13 has the stepped shape including the relief portion 11 and the stress concentration relaxation portion 12, so that the relief portion is affected by the heat effect of electron beam welding. Even when 11 is deformed, it is confirmed that stress is not concentrated in the escape portion 11 because the stress is dispersed and relaxed in the R portion of the stress concentration relaxation portion 12.

以上、説明したように、本実施形態に係るメインギヤ１０（被溶接部材）によれば、メインギヤ１０の隅部１３が、逃げ部１１及び応力集中緩和部１２を含む段付き形状とされているため、電子ビーム溶接時に、逃げ部１１が電子ビームによる熱影響を受けたとしても、その熱影響が応力集中緩和部１２に及ぶことを防止することができる。よって、該メインギヤ１０が、クラッチギヤ２０と溶接され、トランスミッションに組み込まれて使用される際に、凹状に湾曲するように形成された応力集中緩和部１２によって、高応力が隅部１３（逃げ部１１）に集中することを防止することができる。その結果、隅部１３（逃げ部１１）が電子ビーム溶接による熱影響を受けたとしても、当該隅部１３（逃げ部１１）への応力集中を緩和することが可能となる。   As described above, according to the main gear 10 (member to be welded) according to the present embodiment, the corner portion 13 of the main gear 10 has a stepped shape including the relief portion 11 and the stress concentration relaxation portion 12. Even when the escape portion 11 is thermally affected by the electron beam during electron beam welding, the thermal effect can be prevented from reaching the stress concentration relaxation portion 12. Therefore, when the main gear 10 is welded to the clutch gear 20 and incorporated in the transmission, the stress concentration relaxation portion 12 formed so as to bend in a concave shape causes the high stress to be applied to the corner portion 13 (the relief portion). 11) can be prevented from concentrating. As a result, even if the corner portion 13 (relief portion 11) is affected by heat due to electron beam welding, the stress concentration on the corner portion 13 (relief portion 11) can be reduced.

特に、本実施形態に係るメインギヤ１０では、応力集中緩和部１２が、逃げ部１１よりも電子ビームの入射方向ＥＢ（軸心方向）に対して深く、すなわちＲが大きく形成されているため、隅部１３（逃げ部１１）が電子ビーム溶接の熱影響を受け、例えば変形したとしても、該隅部１３（逃げ部１１）への応力集中をより効果的に緩和することが可能となる。   In particular, in the main gear 10 according to the present embodiment, the stress concentration relaxation portion 12 is deeper than the escape portion 11 in the electron beam incident direction EB (axial direction), that is, R is formed larger. Even if the portion 13 (the escape portion 11) is affected by the heat of electron beam welding and deforms, for example, it becomes possible to more effectively alleviate the stress concentration on the corner portion 13 (the escape portion 11).

本実施形態に係るメインギヤ１０では、逃げ部１１が、円弧状に形成され、応力集中緩和部１２が、逃げ部１１から滑らかに連続するように円弧状に形成されているため、逃げ部１１及び応力集中緩和部１２の加工を比較的簡易に行うことができる。すなわち、逃げ部１１及び応力集中緩和部１２それぞれの機能を効果的に発揮できる形状を比較的簡易に形成することができる。   In the main gear 10 according to the present embodiment, the escape portion 11 is formed in an arc shape, and the stress concentration relaxation portion 12 is formed in an arc shape so as to smoothly continue from the escape portion 11. Processing of the stress concentration relaxation portion 12 can be performed relatively easily. That is, it is possible to relatively easily form a shape that can effectively exhibit the functions of the relief portion 11 and the stress concentration relaxation portion 12.

また、本実施形態に係るトランスミッションギヤ１によれば、上述したメインギヤ１０とクラッチギヤ２０とが電子ビーム溶接により一体化されている。よって、上述したように、メインギヤ１０とクラッチギヤ２０とが電子ビーム溶接される際に、該メインギヤ１０の隅部１３（逃げ部１１）が電子ビーム溶接による熱影響を受けたとしても、トランスミッションギヤ１がトランスミッションに組み込まれて使用される際に、メインギヤ１０の隅部１３（逃げ部１１）への応力集中を緩和することが可能となる。   Moreover, according to the transmission gear 1 which concerns on this embodiment, the main gear 10 and the clutch gear 20 which were mentioned above are integrated by electron beam welding. Therefore, as described above, when the main gear 10 and the clutch gear 20 are subjected to electron beam welding, even if the corner portion 13 (relief portion 11) of the main gear 10 is affected by heat due to electron beam welding, the transmission gear. When 1 is incorporated into a transmission and used, stress concentration on the corner 13 (escape portion 11) of the main gear 10 can be reduced.

以上、本発明の実施の形態について説明したが、本発明は、上記実施形態に限定されるものではなく種々の変形が可能である。例えば、上記実施形態では、被溶接部材として、トランスミッションギヤ１のメインギヤ１０を例にして説明したが、被溶接部材は、トランスミッションギヤのメインギヤには限られない。   Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above-described embodiment, the main gear 10 of the transmission gear 1 is described as an example of the member to be welded, but the member to be welded is not limited to the main gear of the transmission gear.

また、上記実施形態では、段付き形状の隅Ｒ部１３が、メインギヤ１０の円筒部１６の外縁に沿って円状に形成されていたが、該隅Ｒ部１３が延びる形状は円状に限られることなく、溶接形状に応じて任意に設定することができる。   In the above embodiment, the stepped corner R portion 13 is formed in a circular shape along the outer edge of the cylindrical portion 16 of the main gear 10. However, the shape in which the corner R portion 13 extends is limited to a circular shape. It can set arbitrarily according to a welding shape, without being done.

１ トランスミッションギヤ
１０ メインギヤ（被溶接部材）
１１ 逃げ部
１２ 応力集中緩和部
１３ 隅Ｒ部（隅部）
２０ クラッチギヤ（カップリング）
ＥＢ 電子ビーム入射方向
1 Transmission gear 10 Main gear (welded member)
11 relief part 12 stress concentration relaxation part 13 corner R part (corner part)
20 Clutch gear (coupling)
EB Electron beam incident direction

Claims (5)

電子ビーム溶接時に照射される電子ビームの入射方向に隅部を有する被溶接部材であって、
前記隅部は、
前記電子ビームの入射方向に窪んだ逃げ部と、
前記逃げ部から連続して凹状に湾曲するように形成された応力集中緩和部と、
を有していることを特徴とする被溶接部材。 A welded member having a corner in the incident direction of an electron beam irradiated during electron beam welding,
The corner is
A relief portion recessed in the incident direction of the electron beam;
A stress concentration relaxation portion formed so as to be continuously concavely curved from the escape portion;
A member to be welded characterized by comprising: 電子ビーム溶接時に照射される電子ビームの入射方向に隅部を有するギヤであって、
前記隅部は、
前記電子ビームの入射方向に窪んだ逃げ部と、
前記逃げ部から連続して凹状に湾曲するように形成された応力集中緩和部と、
を有していることを特徴とするギヤ。 A gear having a corner in the incident direction of an electron beam irradiated during electron beam welding,
The corner is
A relief portion recessed in the incident direction of the electron beam;
A stress concentration relaxation portion formed so as to be continuously concavely curved from the escape portion;
The gear characterized by having. 前記逃げ部は、円弧状に形成され、
前記応力集中緩和部は、前記逃げ部から滑らかに連続するように形成されていることを特徴とする請求項２に記載のギヤ。 The escape portion is formed in an arc shape,
The gear according to claim 2, wherein the stress concentration relaxation part is formed so as to be smoothly continuous from the relief part. 前記応力集中緩和部は、前記逃げ部よりも前記電子ビームの入射方向に対して深く形成されていることを特徴とする請求項３に記載のギヤ。   The gear according to claim 3, wherein the stress concentration relaxation portion is formed deeper than the escape portion in the incident direction of the electron beam. 請求項２〜４のいずれか１項に記載のギヤと、
前記ギヤと電子ビーム溶接により一体化されたカップリングと、を備えることを特徴とするトランスミッションギヤ。
The gear according to any one of claims 2 to 4,
A transmission gear comprising the gear and a coupling integrated by electron beam welding.
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