JP2014173685A - Seal structure, seal structure of differential mechanism and manufacturing method of seal structure - Google Patents

Seal structure, seal structure of differential mechanism and manufacturing method of seal structure Download PDF

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JP2014173685A
JP2014173685A JP2013048166A JP2013048166A JP2014173685A JP 2014173685 A JP2014173685 A JP 2014173685A JP 2013048166 A JP2013048166 A JP 2013048166A JP 2013048166 A JP2013048166 A JP 2013048166A JP 2014173685 A JP2014173685 A JP 2014173685A
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Japan
Prior art keywords
press
seal member
diameter
fit
rotating body
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JP2013048166A
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Japanese (ja)
Inventor
Tatsuo Yokote
達男 横手
Hideyuki Fukui
秀行 福井
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JATCO Ltd
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JATCO Ltd
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Priority to JP2013048166A priority Critical patent/JP2014173685A/en
Priority to CN201410045467.8A priority patent/CN104048047A/en
Priority to KR1020140018459A priority patent/KR20140111591A/en
Publication of JP2014173685A publication Critical patent/JP2014173685A/en
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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
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/029—Gearboxes; Mounting gearing therein characterised by means for sealing the gearboxes, e.g. to improve airtightness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/16—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing
    • 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
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/037—Gearboxes for accommodating differential gearings
    • 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
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0467—Elements of gearings to be lubricated, cooled or heated
    • F16H57/0469—Bearings or seals
    • F16H57/0472—Seals

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Details Of Gearings (AREA)
  • Retarders (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a seal structure which suppresses the loosening of the fit of a seal member which is pressure-inserted into a rotating body.SOLUTION: A seal structure is formed of: a pressure-insertion part 66 in which a seal member 7 is pressure-inserted into a hole 63 of a rotating body 6; a diameter-expanded part 67 which is expanded in diameter along the pressure-insertion direction from an end of the pressure-insertion part 66; a step 68 which extends to the radial inside of the rotating body 6 rather than the pressure-insertion part 66 from an end of the diameter-expanded part 67; and an insertion part 69 which extends along the pressure-insertion direction from an end of the step 68. The seal member 7 comprises a folded part 73 which is deformedly formed by contacting with an inner wall of the rotating body 6 which forms the step 68 at the pressure-insertion, and engaged with the inner wall of the rotating body 6 which forms the diameter-expanded part 67.

Description

本発明はシール構造、ディファレンシャル機構のシール構造およびシール構造の製造方法に関するものである。   The present invention relates to a seal structure, a seal structure of a differential mechanism, and a method for manufacturing the seal structure.

従来、自動変速装置の回転軸の軸内孔にキャップを挿入し、軸内孔をシールするものが特許文献１に開示されている。   Conventionally, Patent Document 1 discloses that a cap is inserted into a shaft inner hole of a rotary shaft of an automatic transmission and the shaft inner hole is sealed.

特開平４−１７５５８０号公報Japanese Patent Laid-Open No. 4-175580

しかし、上記の技術では、キャップなどが熱によって膨張、収縮することで、キャップの嵌りが緩くなり、振動が発生するおそれがある。   However, in the above technique, the cap or the like expands and contracts due to heat, so that the fitting of the cap becomes loose and vibration may occur.

本発明はこのような問題点を解決するために発明されたもので、キャップの嵌りが緩くなることを抑制し、振動の発生を抑制することを目的とする。   The present invention has been invented to solve such a problem, and an object thereof is to suppress loosening of a cap and to suppress generation of vibration.

本発明のある態様に係るシール構造は、流体が入ったケースに軸受支持され、軸に沿って孔が形成された回転体と、回転体の開口部から圧入されて、孔内に流体が流入することを防止するシール部材とを備えたシール構造であって、回転体の孔は、シール部材が圧入される圧入部と、圧入部の端部から圧入方向に沿って拡径する拡径部と、拡径部の端部から圧入部よりも回転体の径方向内側まで延設される段部と、段部の端部から圧入方向に沿って延設される貫通部とから形成され、シール部材は、圧入時に段部を形成する回転体に接触して変形して形成され、拡径部を形成する回転体の内壁に係合する返し部を備える。   A seal structure according to an aspect of the present invention includes a rotating body that is supported by a case containing a fluid and has a hole formed along an axis, and is press-fitted from an opening of the rotating body so that the fluid flows into the hole. The seal structure includes a seal member that prevents the seal member from being pressed, and the hole of the rotating body includes a press-fit portion into which the seal member is press-fitted, and a diameter-expanded portion that expands from the end of the press-fit portion along the press-fit direction. And a stepped portion extending from the end of the enlarged diameter portion to the radially inner side of the rotating body from the press-fit portion, and a through portion extending from the end of the stepped portion along the press-fit direction, The seal member includes a return portion that is formed by contacting and deforming the rotating body that forms the stepped portion during press-fitting, and that engages with the inner wall of the rotating body that forms the enlarged diameter portion.

本発明の別の態様に係るディファレンシャル機構のシール構造は、作動油が入った変速機ケース内に、変速機およびディファレンシャル機構が収容され、ディファレンシャル機構は、変速機から回転が伝達されるピニオンギアと、ピニオンギアに噛合し、変速機ケースに軸受支持され、軸に沿って孔が形成されたサイドギアと、サイドギアの一方の開口部から挿入されて、サイドギアに嵌合するドライブシャフトとを備え、サイドギアのもう一方の開口部から圧入されて、孔内に作動油が流入することを防止するシール部材が孔内に配置されるディファレンシャル機構のシール構造であって、孔は、シール部材が圧入される圧入部と、圧入部の端部から圧入方向に沿って拡径する拡径部と、拡径部の端部から圧入部よりもサイドギアの径方向内側まで延設される段部と、段部の端部から圧入方向に沿って延設される貫通部とから形成され、シール部材は、圧入時に段部を形成するサイドギアの内壁に接触して変形して形成され、拡径部を形成するサイドギアの内壁に係合する返し部を備える。   The seal structure of the differential mechanism according to another aspect of the present invention includes a transmission and a differential mechanism housed in a transmission case containing hydraulic oil, and the differential mechanism includes a pinion gear to which rotation is transmitted from the transmission. The side gear includes a side gear that meshes with the pinion gear, is supported by the transmission case, and has a hole formed along the shaft, and a drive shaft that is inserted through one opening of the side gear and engages with the side gear. A seal structure of a differential mechanism in which a seal member that is press-fitted from the other opening portion of the nozzle and prevents hydraulic oil from flowing into the hole is disposed in the hole, and the seal member is press-fitted into the hole A press-fit portion, a diameter-expanded portion that expands in the press-fit direction from the end of the press-fit portion, and a radial direction of the side gear from the end of the enlarged-diameter portion to the press-fit portion Formed by a step portion extending to the side and a through portion extending from the end portion of the step portion along the press-fitting direction, and the seal member is in contact with the inner wall of the side gear forming the step portion during press-fitting. A return portion that is formed by deformation and engages with the inner wall of the side gear that forms the enlarged diameter portion is provided.

本発明のさらに別の態様に係るシール構造の製造方法は、流体が入ったケースに軸受支持され、軸に沿って孔が形成された回転体にシール部材が圧入されたシール構造の製造方法であって、孔は、シール部材が圧入される圧入部と、圧入部の端部から圧入方向に沿って拡径する拡径部と、拡径部の端部から圧入部よりも回転体の径方向内側まで延設される段部と、段部の端部から圧入方向に沿って延設される貫通部とから形成され、圧入時に、シール部材の先端部を、段部を形成する回転体の内壁に接触させて、さらにシール部材を圧入することで、シール部材の先端部側を径方向外側に変形させて、シール部材の先端部を、拡径部を形成する回転体の内壁に係合させる。   A manufacturing method of a seal structure according to still another aspect of the present invention is a manufacturing method of a seal structure in which a seal member is press-fitted into a rotating body that is supported by a case containing a fluid and has a hole formed along an axis. The hole includes a press-fit portion into which the seal member is press-fitted, a diameter-increased portion that expands from the end of the press-fit portion along the press-fitting direction, and a diameter of the rotating body from the end of the enlarged-diameter portion to the press-fit portion Rotating body that is formed from a step portion extending to the inner side in the direction and a penetrating portion extending from the end portion of the step portion along the press-fitting direction, and that forms the step portion at the tip of the seal member during press-fitting The tip of the seal member is deformed radially outward by making the seal member press-fit into contact with the inner wall of the seal member, and the tip of the seal member is engaged with the inner wall of the rotating body forming the enlarged diameter portion. Combine.

これら態様によると、シール部材に設けた返し部が拡径部を形成する回転体の内壁に係合するので、シール部材の嵌りが緩くなることを抑制し、振動の発生を抑制することができる。   According to these aspects, since the return part provided in the seal member engages with the inner wall of the rotating body forming the enlarged diameter part, it is possible to suppress loosening of the seal member and to suppress generation of vibration. .

本実施形態のディファレンシャル機構の断面図である。It is sectional drawing of the differential mechanism of this embodiment. 図１のサイドギア付近の拡大図である。FIG. 2 is an enlarged view of the vicinity of a side gear in FIG. 1. 圧入する前のシール部材の断面図である。It is sectional drawing of the sealing member before press-fitting. 本実施形態の変形例を示す図である。It is a figure which shows the modification of this embodiment.

本発明の実施形態のディファレンシャル機構１について図１、図２を用いて説明する。図１は、ディファレンシャル機構１の断面図である。図２は図１のサイドギア６付近の拡大図である。   A differential mechanism 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view of the differential mechanism 1. FIG. 2 is an enlarged view of the vicinity of the side gear 6 of FIG.

ディファレンシャル機構１は、ファイナルギア２と、カバー３と、デフキャリア４と、一対のピニオンギア５と、一対のサイドギア６と、シール部材７とを備える。ディファレンシャル機構１は変速機ケース８内に収容されている。変速機ケース８内には、油が封入されている。   The differential mechanism 1 includes a final gear 2, a cover 3, a differential carrier 4, a pair of pinion gears 5, a pair of side gears 6, and a seal member 7. The differential mechanism 1 is accommodated in the transmission case 8. Oil is enclosed in the transmission case 8.

ファイナルギア２は、エンジンなどの動力源で発生した回転が変速機などを介して伝達される。ファイナルギア２には、ボルト１０によってカバー３およびデフキャリア４が固定されている。ファイナルギア２、カバー３、およびデフキャリア４は、同軸上に設けられ、一体となって回転する。   In the final gear 2, rotation generated by a power source such as an engine is transmitted via a transmission or the like. A cover 3 and a differential carrier 4 are fixed to the final gear 2 by bolts 10. The final gear 2, the cover 3, and the differential carrier 4 are provided coaxially and rotate together.

カバー３は、カバー円筒部３１の外周面と変速機ケース８との間に設けたベアリング１１によって回転自在に支持されている。   The cover 3 is rotatably supported by a bearing 11 provided between the outer peripheral surface of the cover cylindrical portion 31 and the transmission case 8.

デフキャリア４は、キャリア円筒部４１の外周面と変速機ケース８との間に設けたベアリング１２によって回転自在に支持されている。   The differential carrier 4 is rotatably supported by a bearing 12 provided between the outer peripheral surface of the carrier cylindrical portion 41 and the transmission case 8.

カバー３とデフキャリア４とは、ピニオンギア５とサイドギア６の一部とを収容する収容部１３を形成する。   The cover 3 and the differential carrier 4 form an accommodating portion 13 that accommodates the pinion gear 5 and a part of the side gear 6.

デフキャリア４には、デフキャリア４の回転軸（後述するサイドギア６の回転軸Ｏ）と直交する方向に軸部材１４が貫通しており、軸部材１４とデフキャリア４とは一体となって回転する。   A shaft member 14 passes through the differential carrier 4 in a direction orthogonal to the rotation axis of the differential carrier 4 (rotation axis O of the side gear 6 described later), and the shaft member 14 and the differential carrier 4 rotate together. To do.

一対のピニオンギア５は、収容部１３に収容され、各ピニオンギア５は収容部１３内の軸部材１４の両側に回転自在に支持されている。ピニオンギア５は軸部材１４が回転すると軸部材１４と一体となって公転し、さらに軸部材１４に対して自転可能となっている。ピニオンギア５にはサイドギア６のギア部６２が噛み合っている。   The pair of pinion gears 5 is accommodated in the accommodating portion 13, and each pinion gear 5 is rotatably supported on both sides of the shaft member 14 in the accommodating portion 13. When the shaft member 14 rotates, the pinion gear 5 revolves integrally with the shaft member 14 and can rotate with respect to the shaft member 14. A gear portion 62 of the side gear 6 is engaged with the pinion gear 5.

サイドギア６は、ギア円筒部６１と、ギア部６２とを備える。また、サイドギア６には、サイドギア６の回転軸Ｏを中心として孔６３が形成される。一対のサイドギア６は、収容部１３内においてギア部６２が軸部材１４を挟み、ギア部６２の先端に設けた開口部６４が軸部材１４と向かい合うように設けられる。サイドギア６は、ファイナルギア２、カバー３、およびデフキャリア４と同軸上に設けられ、ギア円筒部６１がカバー円筒部３１によって回転自在に支持されている。ギア円筒部６１と変速機ケース８との間には、シール材１５が設けられている。   The side gear 6 includes a gear cylindrical portion 61 and a gear portion 62. Further, a hole 63 is formed in the side gear 6 around the rotation axis O of the side gear 6. The pair of side gears 6 are provided so that the gear portion 62 sandwiches the shaft member 14 in the accommodating portion 13 and the opening 64 provided at the tip of the gear portion 62 faces the shaft member 14. The side gear 6 is provided coaxially with the final gear 2, the cover 3, and the differential carrier 4, and the gear cylindrical portion 61 is rotatably supported by the cover cylindrical portion 31. A seal material 15 is provided between the gear cylindrical portion 61 and the transmission case 8.

孔６３は、図２に示すように圧入部６６と、拡径部６７と、段部６８と、挿入部６９とによって形成される。圧入部６６、拡径部６７、段部６８、および挿入部６９は、開口部６４側からサイドギア６の回転軸Ｏ方向に沿って圧入部６６、拡径部６７、段部６８、挿入部６９の順に連続して形成される。孔６３には、開口部６４からシール部材７が圧入され、もう一方の開口部６５からドライブシャフト１６が挿入される。なお、図１には、一方のサイドギア６の孔６３にシール部材７及びドライブシャフト１６が挿入されていない状態を示している。   As shown in FIG. 2, the hole 63 is formed by a press-fit portion 66, an enlarged diameter portion 67, a stepped portion 68, and an insertion portion 69. The press-fit portion 66, the enlarged-diameter portion 67, the step portion 68, and the insertion portion 69 are the press-fit portion 66, the enlarged-diameter portion 67, the step portion 68, and the insertion portion 69 along the rotation axis O direction of the side gear 6 from the opening 64 side. Are formed successively in this order. The seal member 7 is press-fitted into the hole 63 from the opening 64, and the drive shaft 16 is inserted from the other opening 65. FIG. 1 shows a state in which the seal member 7 and the drive shaft 16 are not inserted into the hole 63 of one side gear 6.

圧入部６６には、開口部６４からシール部材７が圧入される。   The seal member 7 is press-fitted into the press-fit portion 66 from the opening 64.

拡径部６７は、圧入部６６の端部から、シール部材７の圧入方向に沿って拡径して形成される。図２に示す拡径部６７を形成するサイドギア６の内壁と段部６８を形成するサイドギア６の内壁との角度αは、４０°〜５０°である。拡径部６７を形成するサイドギア６の内壁に、後述するシール部材７の返し部７３が係合する。   The diameter-expanded portion 67 is formed by expanding from the end portion of the press-fit portion 66 along the press-fit direction of the seal member 7. The angle α between the inner wall of the side gear 6 that forms the enlarged diameter portion 67 shown in FIG. 2 and the inner wall of the side gear 6 that forms the stepped portion 68 is 40 ° to 50 °. A return portion 73 of the seal member 7 described later engages with the inner wall of the side gear 6 that forms the enlarged diameter portion 67.

段部６８は、拡径部６７の端部から径方向内側に向けて形成される。段部６８を形成するサイドギア６の内壁とサイドギア６の回転軸Ｏとの角度は９０°である。段部６８は、圧入部６６よりも径方向内側まで延設される。   The stepped portion 68 is formed from the end of the enlarged diameter portion 67 toward the radially inner side. The angle between the inner wall of the side gear 6 that forms the stepped portion 68 and the rotation axis O of the side gear 6 is 90 °. The stepped portion 68 extends radially inward from the press-fit portion 66.

挿入部６９は、径方向内側の段部６８の端部から圧入方向に沿って形成され、開口部６５からドライブシャフト１６が挿入される。挿入部６９には、ドライブシャフト１６に形成されたスプライン歯１６ａと嵌合するスプライン歯６９ａが形成される。   The insertion portion 69 is formed along the press-fitting direction from the end of the step portion 68 on the radially inner side, and the drive shaft 16 is inserted from the opening 65. The insertion portion 69 is formed with spline teeth 69 a that fit into the spline teeth 16 a formed on the drive shaft 16.

ギア部６２は、収容部１３内に位置するギア円筒部６１の外周に設けられ、ピニオンギア５に噛み合っている。   The gear portion 62 is provided on the outer periphery of the gear cylindrical portion 61 located in the accommodating portion 13 and meshes with the pinion gear 5.

サイドギア６には、ファイナルギア２に伝達された回転が、カバー３、デフキャリア４、軸部材１４、ピニオンギア５を介して伝達される。サイドギア６に伝達された回転は、ドライブシャフト１６を介して駆動輪に伝達される。   The rotation transmitted to the final gear 2 is transmitted to the side gear 6 via the cover 3, differential carrier 4, shaft member 14, and pinion gear 5. The rotation transmitted to the side gear 6 is transmitted to the drive wheels via the drive shaft 16.

シール部材７は、金属製の材料で構成され、開口部６４から圧入部６６に圧入される。シール部材７は、ディスク部７１と、シール円筒部７２と、返し部７３とを備える。なお、詳しくは後述するが、返し部７３は、シール部材７を圧入する際に形成される。   The seal member 7 is made of a metal material and is press-fitted into the press-fit portion 66 from the opening 64. The seal member 7 includes a disk portion 71, a seal cylindrical portion 72, and a return portion 73. As will be described in detail later, the return portion 73 is formed when the seal member 7 is press-fitted.

ディスク部７１はサイドギア６の開口部６４の径に合わせて形成され、開口部６４を塞いでいる。   The disk portion 71 is formed in accordance with the diameter of the opening 64 of the side gear 6 and closes the opening 64.

シール円筒部７２は、ディスク部７１の外周縁から圧入方向に延設され、圧入部６６に圧入される。   The seal cylindrical portion 72 extends from the outer peripheral edge of the disk portion 71 in the press-fitting direction and is press-fitted into the press-fit portion 66.

返し部７３は、圧入時にシール円筒部７２の先端部側が変形して形成され、拡径部６７を形成するサイドギア６の内壁に係合する。   The return portion 73 is formed by deforming the distal end side of the seal cylindrical portion 72 during press-fitting, and engages with the inner wall of the side gear 6 forming the enlarged diameter portion 67.

ここで、圧入部６６に圧入される前のシール部材７を図３に示す。圧入部６６に圧入される前のシール部材７は、ディスク部７１と、シール円筒部７２とから構成されており、シール円筒部７２の先端部側には圧入方向に沿って拡径するテーパ部７４が形成されている。テーパ部７４は、段部６８を形成するサイドギア６の内壁との角度βが図３に示すように４５°となるように形成されている。   Here, the seal member 7 before being press-fitted into the press-fit portion 66 is shown in FIG. The seal member 7 before being press-fitted into the press-fit portion 66 is composed of a disk portion 71 and a seal cylindrical portion 72, and a tapered portion that expands in diameter along the press-fit direction on the tip end side of the seal cylindrical portion 72. 74 is formed. The taper portion 74 is formed such that the angle β with the inner wall of the side gear 6 forming the step portion 68 is 45 ° as shown in FIG.

シール部材７は圧入部６６に圧入されると、シール円筒部７２の先端部が段部６８を形成するサイドギア６の内壁に接触し、さらにシール部材７が圧入部６６に圧入されると、シール円筒部７２の先端部側は径方向外側に向けて塑性変形し、返し部７３が形成される。返し部７３は、拡径部６７を形成するサイドギア６の内壁に係合し、シール部材７の嵌りが緩くなることを抑制する。   When the seal member 7 is press-fitted into the press-fit portion 66, the tip of the seal cylindrical portion 72 comes into contact with the inner wall of the side gear 6 that forms the stepped portion 68, and when the seal member 7 is press-fitted into the press-fit portion 66, the seal The tip end side of the cylindrical portion 72 is plastically deformed outward in the radial direction, and a return portion 73 is formed. The return portion 73 engages with the inner wall of the side gear 6 that forms the enlarged diameter portion 67 and suppresses loosening of the seal member 7.

本発明の実施形態の効果について説明する。   The effect of the embodiment of the present invention will be described.

油が封入される変速機ケース８内で回転し、サイドギア６の回転軸Ｏに沿って孔６３が形成されたサイドギア６にシール部材７を圧入するディファレンシャル機構１において、孔６３を、シール部材７が圧入される圧入部６６と、圧入部６６の端部から圧入方向に沿って拡径する拡径部６７と、拡径部６７の端部から圧入部６６よりも径方向内側まで延設される段部６８と、段部６８の端部から圧入方向に沿って延設される挿入部６９とから形成する。さらにシール部材７に、圧入時に段部６８を形成するサイドギア６の内壁に接触して変形し、拡径部６７を形成するサイドギア６の内壁に係合する返し部７３を形成する。   In the differential mechanism 1 that rotates in the transmission case 8 in which oil is sealed and press-fits the seal member 7 into the side gear 6 in which the hole 63 is formed along the rotation axis O of the side gear 6, the hole 63 is formed in the seal member 7. Is inserted from the end of the press-fit portion 66 along the press-in direction, and is extended from the end of the large-diameter portion 67 to the inside of the press-fit portion 66 in the radial direction. A step portion 68 and an insertion portion 69 extending from the end portion of the step portion 68 along the press-fitting direction. Further, the seal member 7 is formed with a return portion 73 that contacts the inner wall of the side gear 6 that forms the stepped portion 68 during press-fitting and engages with the inner wall of the side gear 6 that forms the enlarged diameter portion 67.

返し部７３が拡径部６７を形成するサイドギア６の内壁に係合することで、シール部材７が熱によって膨張、収縮した場合でも、シール部材７の嵌りが緩くなることを抑制し、振動が発生することを抑制することができる（請求項１、４、５に対応する効果）。   By engaging the return portion 73 with the inner wall of the side gear 6 that forms the enlarged diameter portion 67, even when the seal member 7 expands and contracts due to heat, the fitting of the seal member 7 is suppressed from being loosened, and vibration is generated. Generation | occurrence | production can be suppressed (effect corresponding to Claim 1, 4, 5).

また、変速機ケース８内に封入された油が孔６３内に漏れることを防止し、変速機ケース８から油が漏れることを防止し、シール性を向上することができる。ドライブシャフト１６とギア円筒部６１との間にシール材を設けることも可能であるが、この場合、ドライブシャフト１６を挿入する前に変速機ケース８に油を入れることができない。そのため、組立に際し、変速機ケース８を組み立てた後に、ドライブシャフト１６を挿入し、さらにその後変速機ケース８に油を封入しなければならず、作業効率が悪くなる。本実施形態では、シール部材７を圧入し、さらに返し部７３を、拡径部６７を形成するサイドギア６の内壁に係合させることで、ドライブシャフト１６を挿入する前に油が漏れることを防止し、変速機ケース８を組み立てた後に、ドライブシャフト１６を挿入すればよく、作業効率を向上することができる（請求項１、４、５に対応する効果）。   Further, the oil sealed in the transmission case 8 can be prevented from leaking into the hole 63, the oil can be prevented from leaking from the transmission case 8, and the sealing performance can be improved. Although it is possible to provide a seal material between the drive shaft 16 and the gear cylindrical portion 61, in this case, oil cannot be put into the transmission case 8 before the drive shaft 16 is inserted. Therefore, at the time of assembly, after assembling the transmission case 8, the drive shaft 16 must be inserted, and then oil must be sealed in the transmission case 8, resulting in poor work efficiency. In this embodiment, the seal member 7 is press-fitted, and the return portion 73 is engaged with the inner wall of the side gear 6 that forms the enlarged diameter portion 67, thereby preventing oil from leaking before the drive shaft 16 is inserted. Then, after assembling the transmission case 8, the drive shaft 16 may be inserted, and the working efficiency can be improved (effect corresponding to claims 1, 4, and 5).

圧入部６６に圧入される前のシール部材７のシール円筒部７２の先端部側に圧入方向に沿って拡径するテーパ部７４を形成することで、シール円筒部７２の先端部側を径方向外側に容易に変形させて、返し部７３を容易に形成することができる（請求項２に対応する効果）。   By forming a tapered portion 74 having a diameter increasing along the press-fitting direction on the tip end side of the seal cylindrical portion 72 of the seal member 7 before being press-fitted into the press-fit portion 66, the tip end side of the seal cylindrical portion 72 is radially arranged. The return portion 73 can be easily formed by being easily deformed outward (effect corresponding to claim 2).

以上、本発明の実施形態について説明したが、上記実施形態は本発明の適用例の一部を示したに過ぎず、本発明の技術的範囲を上記実施形態の具体的構成に限定する趣旨ではない。   The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

なお、上記実施形態ではディファレンシャル機構を一例として説明したが、これに限られることはなく、回転体内に設けた孔内に流体が漏れることを防ぐシール構造について適用することができる。   In the above-described embodiment, the differential mechanism is described as an example. However, the present invention is not limited to this, and a seal structure that prevents fluid from leaking into a hole provided in the rotating body can be applied.

上記実施形態では、段部６８を形成するサイドギア６の内壁とサイドギア６の回転軸Ｏとの角度が９０°となるように段部６８を設けたが、これに限られることはなく、図４に示すように圧入方向に沿って段部６８が拡径するように孔６３を形成してもよい。これにより、シール部材７を孔６３に圧入する場合に、段部６８を形成するサイドギア６の内壁に接触したシール円筒部７２の先端部側を径方向外側に容易に変形させることができる（請求項３に対応する効果）。   In the above embodiment, the step portion 68 is provided so that the angle between the inner wall of the side gear 6 forming the step portion 68 and the rotation axis O of the side gear 6 is 90 °, but the present invention is not limited to this. As shown, the hole 63 may be formed so that the stepped portion 68 expands in the press-fitting direction. Accordingly, when the seal member 7 is press-fitted into the hole 63, the tip end side of the seal cylindrical portion 72 that is in contact with the inner wall of the side gear 6 forming the stepped portion 68 can be easily deformed radially outward. Effect corresponding to item 3).

上記実施形態では、テーパ部７４と段部６８を形成するサイドギア６の内壁との角度βを４５°とし、拡径部６７を形成するサイドギア６の内壁と段部６８を形成するサイドギア６の内壁との角度αを４０°〜５０°としたが、これらに限られることはなく、圧入時にシール円筒部７２の先端部側を容易に径方向外側に変形させ、シール部材７の返し部７３と拡径部６７を形成するサイドギア６の内壁とを係合させて、本実施形態の効果を得ることができればよい。   In the above embodiment, the angle β between the tapered portion 74 and the inner wall of the side gear 6 that forms the step portion 68 is 45 °, and the inner wall of the side gear 6 that forms the enlarged diameter portion 67 and the inner wall of the side gear 6 that forms the step portion 68. The angle α is 40 ° to 50 °. However, the present invention is not limited thereto, and the tip end side of the seal cylindrical portion 72 can be easily deformed radially outward at the time of press-fitting, and the return portion 73 of the seal member 7 The effect of this embodiment should just be acquired by engaging with the inner wall of the side gear 6 which forms the enlarged diameter part 67. FIG.

１ ディファレンシャル機構
６ サイドギア（回転体）
７ シール部材
６３ 孔
６６ 圧入部
６７ 拡径部
６８ 段部
６９ 挿入部（貫通部）
７３ 返し部 1 Differential mechanism 6 Side gear (rotating body)
7 Seal member 63 Hole 66 Press-in part 67 Expanded diameter part 68 Step part 69 Insertion part (penetration part)
73 Return part

Claims (5)

流体が入ったケースに軸受支持され、軸に沿って孔が形成された回転体と、
前記回転体の開口部から圧入されて、前記孔内に前記流体が流入することを防止するシール部材とを備えたシール構造であって、
前記孔は、前記シール部材が圧入される圧入部と、前記圧入部の端部から圧入方向に沿って拡径する拡径部と、前記拡径部の端部から前記圧入部よりも前記回転体の径方向内側まで延設される段部と、前記段部の端部から前記圧入方向に沿って延設される貫通部とから形成され、
前記シール部材は、圧入時に前記段部を形成する前記回転体の内壁に接触して変形して形成され、前記拡径部を形成する前記回転体の内壁に係合する返し部を備えることを特徴とするシール構造。 A rotating body that is supported by a case containing fluid and has a hole formed along an axis;
A seal structure that includes a seal member that is press-fitted from an opening of the rotating body and prevents the fluid from flowing into the hole;
The hole includes a press-fit portion into which the seal member is press-fitted, a diameter-expanded portion that expands from the end portion of the press-fit portion along the press-fit direction, and the rotation from the end portion of the diameter-expanded portion to the press-fit portion. Formed from a step portion extending to the inside in the radial direction of the body, and a through portion extending from the end portion of the step portion along the press-fitting direction,
The seal member includes a return portion that is formed by contacting and deforming the inner wall of the rotating body that forms the stepped portion during press-fitting, and that engages with the inner wall of the rotating body that forms the enlarged diameter portion. Characteristic seal structure. 請求項１に記載のシール構造であって、
前記回転体に圧入される前の前記シール部材の先端部の内周壁は、前記圧入方向に沿って拡径することを特徴とするシール構造。 The seal structure according to claim 1,
An inner peripheral wall of a tip portion of the seal member before being press-fitted into the rotating body is expanded in diameter along the press-fitting direction. 請求項１または２に記載のシール構造であって、
前記段部は、前記圧入方向に沿って拡径することを特徴とするシール構造。 The seal structure according to claim 1 or 2,
The step structure has a seal structure in which the diameter is increased along the press-fitting direction. 作動油が入った変速機ケース内に、変速機およびディファレンシャル機構が収容され、
前記ディファレンシャル機構は、
前記変速機から回転が伝達されるピニオンギアと、
前記ピニオンギアに噛合し、前記変速機ケースに軸受支持され、軸に沿って孔が形成されたサイドギアと、
前記サイドギアの一方の開口部から挿入されて、前記サイドギアに嵌合するドライブシャフトとを備え、前記サイドギアのもう一方の開口部から圧入されて、前記孔内に前記作動油が流入することを防止するシール部材が前記孔内に配置されるディファレンシャル機構のシール構造であって、
前記孔は、前記シール部材が圧入される圧入部と、前記圧入部の端部から圧入方向に沿って拡径する拡径部と、前記拡径部の端部から前記圧入部よりも前記サイドギアの径方向内側まで延設される段部と、前記段部の端部から前記圧入方向に沿って延設される貫通部とから形成され、
前記シール部材は、圧入時に前記段部を形成する前記サイドギアの内壁に接触して変形して形成され、前記拡径部を形成する前記サイドギアの内壁に係合する返し部を備えることを特徴とするディファレンシャル機構のシール構造。 A transmission and a differential mechanism are housed in a transmission case containing hydraulic oil,
The differential mechanism is
A pinion gear to which rotation is transmitted from the transmission;
A side gear that meshes with the pinion gear, is supported by the transmission case and has a hole formed along an axis;
A drive shaft that is inserted from one opening of the side gear and engages with the side gear, and is pressed from the other opening of the side gear to prevent the hydraulic oil from flowing into the hole. A sealing structure of a differential mechanism in which a sealing member is disposed in the hole,
The hole includes a press-fit portion into which the seal member is press-fitted, a diameter-expanded portion that expands in diameter from the end portion of the press-fit portion, and the side gear from the end portion of the diameter-expanded portion to the press-fit portion. Formed from a step portion extending radially inward and a through portion extending from the end portion of the step portion along the press-fitting direction,
The seal member includes a return portion that is formed by contacting and deforming the inner wall of the side gear that forms the stepped portion during press-fitting, and that engages with the inner wall of the side gear that forms the enlarged diameter portion. The differential mechanism seal structure. 流体が入ったケースに軸受支持され、軸に沿って孔が形成された回転体にシール部材が圧入されたシール構造の製造方法であって、
前記孔は、前記シール部材が圧入される圧入部と、前記圧入部の端部から圧入方向に沿って拡径する拡径部と、前記拡径部の端部から前記圧入部よりも前記回転体の径方向内側まで延設される段部と、前記段部の端部から前記圧入方向に沿って延設される貫通部とから形成され、
圧入時に、前記シール部材の先端部を、前記段部を形成する前記回転体の内壁に接触させ、
さらに前記シール部材を圧入することで、前記シール部材の先端部を径方向外側に変形させて、前記シール部材の先端部側を、前記拡径部を形成する前記回転体の内壁に係合させることを特徴とするシール構造の製造方法。 A manufacturing method of a seal structure in which a seal member is press-fitted into a rotating body that is supported by a case containing a fluid and has a hole formed along an axis,
The hole includes a press-fit portion into which the seal member is press-fitted, a diameter-expanded portion that expands from the end portion of the press-fit portion along the press-fit direction, and the rotation from the end portion of the diameter-expanded portion to the press-fit portion. Formed from a step portion extending to the inside in the radial direction of the body, and a through portion extending from the end portion of the step portion along the press-fitting direction,
At the time of press-fitting, the tip of the seal member is brought into contact with the inner wall of the rotating body that forms the stepped portion,
Further, by press-fitting the seal member, the distal end portion of the seal member is deformed radially outward, and the distal end portion side of the seal member is engaged with the inner wall of the rotating body forming the enlarged diameter portion. A manufacturing method of a seal structure characterized by the above.
JP2013048166A 2013-03-11 2013-03-11 Seal structure, seal structure of differential mechanism and manufacturing method of seal structure Pending JP2014173685A (en)

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