JP3777491B2 - Assembly structure of stator shaft in automatic transmission - Google Patents

Assembly structure of stator shaft in automatic transmission Download PDF

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Publication number
JP3777491B2
JP3777491B2 JP11602598A JP11602598A JP3777491B2 JP 3777491 B2 JP3777491 B2 JP 3777491B2 JP 11602598 A JP11602598 A JP 11602598A JP 11602598 A JP11602598 A JP 11602598A JP 3777491 B2 JP3777491 B2 JP 3777491B2
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Japan
Prior art keywords
diameter portion
stator shaft
oil pump
pump cover
fitted
Prior art date
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Expired - Fee Related
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JP11602598A
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Japanese (ja)
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JPH11294555A (en
Inventor
達哉 梶谷
真一 望月
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Aichi Machine Industry Co Ltd
JATCO Ltd
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Aichi Machine Industry Co Ltd
JATCO Ltd
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Publication date
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Priority to JP11602598A priority Critical patent/JP3777491B2/en
Publication of JPH11294555A publication Critical patent/JPH11294555A/en
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Publication of JP3777491B2 publication Critical patent/JP3777491B2/en
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【０００１】
【産業上の利用分野】
この発明は、自動変速機におけるステータシャフトの組付構造に関するものである。
【０００２】
【従来の技術及びその課題】
従来の自動変速機におけるステータシャフトの組付構造としては、例えば特開平１−１１６３７２号公報に記載されたものがあり、この構造は図３に示すように構成されており、オイルポンプ４０は中央部に貫通穴４２を有するオイルポンプカバー４１と、これの一端側で回転要素であるアウタギヤ４３及びインナギヤ４４を収容するオイルポンプハウジング４５と、圧入方向先端部に歯形部４６を有するステータシャフト４７とからなり、ステータシャフト４７がオイルポンプ４０の回転要素側から圧入されて嵌合しており、これにより組付け時に歯形部４６によって削り取られた切り屑がオイルポンプ４０の内部に侵入するのを防止している。
【０００３】
しかしながら、この従来構造にあっては回転要素側からステータシャフト４７を組付けているため、ステータシャフト４７の圧入方向先端部に設けられた歯形部４６の外径をオイルポンプカバー４１の内径よりも大きくすることができず、径方向寸法の自由度が低く、このため大きなトルクの掛かるステータシャフト４７の歯形部４６の軸方向寸法が大となり、自動変速機の軸方向寸法が大になるという問題点がある。
また、オイルポンプカバー４１の貫通穴４２の径をある程度大きくすることもできないではないが、一般的にステータシャフト４７は鉄系金属で形成され、オイルポンプカバー４１はアルミニウム製で形成されており、オイルポンプカバー４１の回転要素側端面から歯形側端面までの間の、比重の重いステータシャフト４７の肉厚が厚くなってしまい、自動変速機の軽量化が図れないという問題点があった。
【０００４】
また、別の従来の自動変速機におけるステータシャフトの組付構造として、例えば特開平６−２５７６６９号公報に記載されたものがあり、この構造は、図４に示すように、ステータシャフト４７がオイルポンプカバー４１の貫通穴４２に、オイルポンプ４０の回転要素４３，４４側に向けて圧入されて嵌合している。しかしながら、この従来例にあっては、ステータシャフト４７の、オイルポンプカバー４１と圧入嵌合している部分の図中左側に、セレーション結合用の歯形部が形成されており、組付け時に歯形部によって削り取られた切り屑がオイルポンプ４０の圧入嵌合部分に侵入するのを防止できず、ステータシャフト４７とオイルポンプカバー４１との間に嵌まり込み、正確な寸法位置に組付けるのが困難な場合が生じたり、オイルポンプカバー４１とステータシャフト４７との間のシール性が低下する恐れがあった。
【０００５】
【課題を解決するための手段】
本発明は上記従来の問題点に鑑み案出したものであって、正確な寸法位置に組付けることができ、また、大トルクに対し十分な強度を確保できるステータシャフトの組付構造を提供せんことを目的とし、その要旨は、一端側にオイルポンプの回転要素が配置されたオイルポンプカバーの内周に他端側から一端側に向けて圧入された自動変速機におけるステータシャフトの組付構造において、該ステータシャフトには、小径部から外側へ拡径された大径部が段状に形成され、該大径部の外周にはセレーションが形成されてなり、一方、前記オイルポンプカバーの内周には、前記ステータシャフトの小径部が圧入される小径部と、前記ステータシャフトの大径部がセレーション嵌合される大径部とが形成され、前記ステータシャフトの大径部がオイルポンプカバーの大径部の所定位置に嵌合された状態で、オイルポンプカバーの大径部と小径部とを連結するオイルポンプカバーの段差面と、該オイルポンプカバーの段差面に対向しステータシャフトの大径部と小径部とを連結するステータシャフトの段差面との間に隙間が形成されるように構成したことである。
【０００６】
【実施例】
以下、本発明の実施例を図面に基づいて説明する。
図１は、自動変速機におけるオイルポンプカバー５の内周にステータシャフト６を嵌合した状態の断面構成図であり、図２は、その要部拡大構成図である。
【０００７】
オイルポンプ４のケース内には回転要素を構成するアウタギヤ４ａとインナギヤ４ｂが収容されて、オイルポンプカバー５の一端側が当接され、オイルポンプカバー５の内周には、端面５ａ側より大径の大径部５ｃが形成され、その内側には段差面５ｄを介して小径部５ｂが形成されたものとなっている。
【０００８】
一方、このオイルポンプカバー５の内周に圧入されるステータシャフト６には、前記オイルポンプカバー５の小径部５ｂに圧入される小径部６ａが形成されているとともに、前記オイルポンプカバー５の大径部５ｃにセレーション嵌合される大径部６ｂが形成されており、この大径部６ｂの外周にはセレーション６ｄが形成されたものとなっている。
また、大径部６ｂのセレーション６ｄの右端部には凹み状に第１逃げ部６ｅが形成されており、さらに内側に垂直状に段差面６ｇが形成され、段差面６ｇの下端側には小径部６ａ側へ凹んで第２逃げ部６ｆが形成されたものとなっている。
【０００９】
前記オイルポンプカバー５の端面５ａを上向きにした状態で、上方よりステータシャフト６を前記小径部５ｂに対し小径部６ａを圧入状に嵌合させてゆき、さらに大径部５ｃに対しセレーション６ｄを介し大径部６ｂをセレーション嵌合させてゆき、ステータシャフト６の端面６ｃがオイルポンプカバー５の端面５ａと面一状に整合する状態にステータシャフト６が押し込まれた状態では、前記オイルポンプカバー５の段差面５ｄとステータシャフト６の段差面６ｇ間に隙間Ｓが形成されるように設定されており、この隙間Ｓ内に、セレーション嵌合部で生じた切り屑が溜まるように構成され、切り屑がステータシャフト６の小径部６ａ側に侵入するのを良好に防止できるように構成されている。
【００１０】
従って、小径部６ａ側には切り屑が侵入しないために、ステータシャフト６とオイルポンプカバー５間のシール性が良好に確保されるものとなり、隙間Ｓ内に切り屑を溜めてステータシャフト６を正確な位置に組付けることができるものとなる。また、大トルクが掛かるステータシャフト６のセレーション６ｄ部分の径方向寸法の自由度が広がって、強度的に優れた組付構造を得ることができるものとなる。
【００１１】
【発明の効果】
本発明は、一端側にオイルポンプの回転要素が配置されたオイルポンプカバーの内周に他端側から一端側に向けて圧入された自動変速機におけるステータシャフトの組付構造において、該ステータシャフトには、小径部から外側へ拡径された大径部が段状に形成され、該大径部の外周にはセレーションが形成されてなり、一方、前記オイルポンプカバーの内周には、前記ステータシャフトの小径部が圧入される小径部と、前記ステータシャフトの大径部がセレーション嵌合される大径部とが形成され、前記ステータシャフトの大径部がオイルポンプカバーの大径部の所定位置に嵌合された状態で、オイルポンプカバーの大径部と小径部とを連結するオイルポンプカバーの段差面と、該オイルポンプカバーの段差面に対向しステータシャフトの大径部と小径部とを連結するステータシャフトの段差面との間に隙間が形成されるように構成したことにより、オイルポンプカバーに対しステータシャフトが圧入される時に、セレーション部による切り屑が発生しても、隙間が形成されているため、この隙間内に切り屑が溜まり込んで、ステータシャフトの小径部側に切り屑が侵入することが防がれ、このためステータシャフトとオイルポンプカバーとの間のシール性の低下を防ぐことができるとともに、切り屑を隙間内で吸収してステータシャフトを正確な位置に組付けることができ、寸法設定を正確に行うことができるものとなる。
また、他端側から一端側に向けてステータシャフトがオイルポンプカバーに圧入されているため、大トルクが掛かるステータシャフトのセレーション部分の径方向寸法の自由度が広がり、自動変速機の軸方向寸法を大とすることなく強度的に優れたステータシャフトの組付構造を得ることができるものとなる。
【図面の簡単な説明】
【図１】オイルポンプカバーにステータシャフトを組付けた状態の断面構成図である。
【図２】図１の要部拡大構成図である。
【図３】従来のステータシャフトの組付構造の断面構成図である。
【図４】さらに異なる従来のステータシャフトの組付構造の断面構成図である。
【符号の説明】
４ オイルポンプ
４ａ アウタギヤ
４ｂ インナギヤ
５ オイルポンプカバー
５ａ 端面
５ｂ 小径部
５ｃ 大径部
５ｄ 段差面
６ ステータシャフト
６ａ 小径部
６ｂ 大径部
６ｃ 端面
６ｄ セレーション
６ｅ 第１逃げ部
６ｆ 第２逃げ部
６ｇ 段差面
Ｓ 隙間[0001]
[Industrial application fields]
The present invention relates to an assembly structure of a stator shaft in an automatic transmission.
[0002]
[Prior art and problems]
As an assembly structure of a stator shaft in a conventional automatic transmission, for example, there is one described in Japanese Patent Application Laid-Open No. 1-116372. This structure is configured as shown in FIG. An oil pump cover 41 having a through-hole 42 in its part, an oil pump housing 45 that accommodates an outer gear 43 and an inner gear 44 that are rotating elements at one end thereof, and a stator shaft 47 having a tooth profile 46 at the tip end in the press-fitting direction. The stator shaft 47 is press-fitted and fitted from the rotating element side of the oil pump 40, thereby preventing chips scraped off by the tooth profile 46 during assembly from entering the oil pump 40. is doing.
[0003]
However, in this conventional structure, since the stator shaft 47 is assembled from the rotating element side, the outer diameter of the tooth profile portion 46 provided at the front end portion in the press-fitting direction of the stator shaft 47 is made larger than the inner diameter of the oil pump cover 41. The problem is that the axial dimension of the tooth profile 46 of the stator shaft 47 that is subjected to a large torque is large and the axial dimension of the automatic transmission is large. There is a point.
Although it is not impossible to increase the diameter of the through hole 42 of the oil pump cover 41 to some extent, the stator shaft 47 is generally made of an iron-based metal, and the oil pump cover 41 is made of aluminum. There is a problem that the thickness of the stator shaft 47 having a heavy specific gravity between the end surface on the rotating element side of the oil pump cover 41 and the end surface on the tooth profile side is increased, and the weight of the automatic transmission cannot be reduced.
[0004]
Further, as the assembly structure of the stator shaft in the another conventional automatic transmission, for example, are those described in JP-A-6-257669, the structure, as shown in FIG. 4, the scan stator shaft 47 is The oil pump cover 41 is press-fitted into the through-hole 42 toward the rotating elements 43 and 44 of the oil pump 40 and is fitted. However, this in the conventional example, the stator shaft 47, the left side in the drawing of the portion press-fitted to the oil pump cover 41, gear portion for serration coupling is formed, teeth during assembly portion the thus scraped swarf can not be prevented from entering the press fit portion of the oil pump 40, included fits between the stator shaft 47 and the oil pump cover 41, that assembled in precise dimensions position There is a possibility that a difficult case may occur or the sealing performance between the oil pump cover 41 and the stator shaft 47 is deteriorated.
[0005]
[Means for Solving the Problems]
The present invention has been devised in view of the above-described conventional problems, and does not provide an assembly structure of a stator shaft that can be assembled at an accurate dimensional position and can secure sufficient strength against a large torque. The gist of this is the assembly structure of the stator shaft in the automatic transmission that is press-fitted from the other end side toward the one end side into the inner periphery of the oil pump cover in which the oil pump rotating element is arranged at one end side. The stator shaft is formed with a large diameter portion that is expanded from the small diameter portion to the outside in a step shape, and serrations are formed on the outer periphery of the large diameter portion. A small-diameter portion into which the small-diameter portion of the stator shaft is press-fitted and a large-diameter portion into which the large-diameter portion of the stator shaft is serrated and fitted are formed on the circumference, and the large-diameter portion of the stator shaft is When the oil pump cover is fitted in a predetermined position on the large diameter portion of the oil pump cover, the step surface of the oil pump cover that connects the large diameter portion and the small diameter portion of the oil pump cover is opposed to the step surface of the oil pump cover. In other words, a gap is formed between the step surface of the stator shaft that connects the large diameter portion and the small diameter portion of the stator shaft.
[0006]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional configuration diagram of a state in which a stator shaft 6 is fitted to the inner periphery of an oil pump cover 5 in an automatic transmission, and FIG. 2 is an enlarged configuration diagram of a main part thereof.
[0007]
An outer gear 4a and an inner gear 4b constituting a rotating element are accommodated in the case of the oil pump 4, and one end side of the oil pump cover 5 is brought into contact with the inner periphery of the oil pump cover 5, which has a larger diameter than the end surface 5a side. The large-diameter portion 5c is formed, and the small-diameter portion 5b is formed on the inner side through a step surface 5d.
[0008]
On the other hand, the stator shaft 6 that is press-fitted into the inner periphery of the oil pump cover 5 is formed with a small-diameter portion 6 a that is press-fitted into the small-diameter portion 5 b of the oil pump cover 5. A large-diameter portion 6b that is serrated and fitted to the diameter portion 5c is formed, and a serration 6d is formed on the outer periphery of the large-diameter portion 6b.
A first relief portion 6e is formed in a concave shape at the right end portion of the serration 6d of the large diameter portion 6b, a step surface 6g is formed vertically inside, and a small diameter is formed on the lower end side of the step surface 6g. The second relief portion 6f is formed to be recessed toward the portion 6a.
[0009]
With the end surface 5a of the oil pump cover 5 facing upward, the stator shaft 6 is fitted into the small diameter portion 5b in a press-fit manner from above, and the serration 6d is further inserted into the large diameter portion 5c. When the stator shaft 6 is pushed into a state in which the large diameter portion 6b is serrated and the end surface 6c of the stator shaft 6 is aligned with the end surface 5a of the oil pump cover 5, the oil pump cover 5 is configured such that a gap S is formed between the stepped surface 5d of the stator 5 and the stepped surface 6g of the stator shaft 6, and the chips generated in the serration fitting portion are accumulated in the gap S. It is configured so that chips can be well prevented from entering the small diameter portion 6 a side of the stator shaft 6.
[0010]
Accordingly, since chips do not enter the small diameter portion 6a side, a good sealing property between the stator shaft 6 and the oil pump cover 5 is ensured, and the stator shaft 6 is collected by collecting the chips in the gap S. It can be assembled at an accurate position. Further, the degree of freedom in the radial dimension of the serration 6d portion of the stator shaft 6 to which a large torque is applied is expanded, and an assembling structure excellent in strength can be obtained.
[0011]
【The invention's effect】
The present invention relates to an assembly structure of a stator shaft in an automatic transmission that is press-fitted from one end to the other end on the inner periphery of an oil pump cover in which an oil pump rotating element is disposed on one end. The large-diameter portion expanded from the small-diameter portion to the outside is formed in a step shape, and the outer periphery of the large-diameter portion is formed with serrations, while the inner periphery of the oil pump cover is A small-diameter portion into which the small-diameter portion of the stator shaft is press-fitted and a large-diameter portion into which the large-diameter portion of the stator shaft is serrated and fitted are formed, and the large-diameter portion of the stator shaft is the large-diameter portion of the oil pump cover. A step surface of the oil pump cover that connects the large diameter portion and the small diameter portion of the oil pump cover in a state of being fitted in a predetermined position, and a step surface of the stator shaft facing the step surface of the oil pump cover. By forming a gap between the stepped surface of the stator shaft that connects the diameter part and the small diameter part, chips are generated by the serration part when the stator shaft is press-fitted into the oil pump cover. However, since a gap is formed, chips accumulate in the gap, preventing chips from entering the small diameter side of the stator shaft. Therefore, the stator shaft and the oil pump cover The sealing performance can be prevented from being lowered, and the stator shaft can be assembled at an accurate position by absorbing chips in the gap, and the dimension can be accurately set.
In addition, since the stator shaft is press-fitted into the oil pump cover from the other end side to the one end side, the degree of freedom in the radial dimension of the serration portion of the stator shaft, where large torque is applied, increases, and the axial dimension of the automatic transmission Thus, a stator shaft assembly structure excellent in strength can be obtained without increasing the length.
[Brief description of the drawings]
FIG. 1 is a cross-sectional configuration diagram of a state in which a stator shaft is assembled to an oil pump cover.
FIG. 2 is an enlarged configuration diagram of a main part of FIG. 1;
FIG. 3 is a cross-sectional configuration diagram of a conventional stator shaft assembly structure;
FIG. 4 is a cross-sectional configuration diagram of still another conventional stator shaft assembly structure.
[Explanation of symbols]
4 Oil pump 4a Outer gear 4b Inner gear 5 Oil pump cover 5a End surface 5b Small diameter portion 5c Large diameter portion 5d Step surface 6 Stator shaft 6a Small diameter portion 6b Large diameter portion 6c End surface 6d Serration 6e First relief portion 6f Second relief portion 6g Step surface S clearance

Claims (1)

一端側にオイルポンプの回転要素が配置されたオイルポンプカバーの内周に、他端側から一端側に向けて圧入された自動変速機におけるステータシャフトの組付構造において、該ステータシャフトには、小径部から外側へ拡径された大径部が段状に形成され、該大径部の外周にはセレーションが形成されてなり、一方、前記オイルポンプカバーの内周には、前記ステータシャフトの小径部が圧入される小径部と、前記ステータシャフトの大径部がセレーション嵌合される大径部とが形成され、前記ステータシャフトの大径部がオイルポンプカバーの大径部の所定位置に嵌合された状態で、オイルポンプカバーの大径部と小径部とを連結するオイルポンプカバーの段差面と、該オイルポンプカバーの段差面に対向しステータシャフトの大径部と小径部とを連結するステータシャフトの段差面との間に隙間が形成されるように構成したことを特徴とする自動変速機におけるステータシャフトの組付構造。In the assembly structure of the stator shaft in the automatic transmission that is press-fitted from the other end side toward the one end side on the inner periphery of the oil pump cover in which the rotation element of the oil pump is arranged on one end side, A large-diameter portion expanded from the small-diameter portion to the outside is formed in a step shape, and serrations are formed on the outer periphery of the large-diameter portion, while the stator shaft is provided on the inner periphery of the oil pump cover. A small-diameter portion into which the small-diameter portion is press-fitted and a large-diameter portion into which the large-diameter portion of the stator shaft is serrated are formed, and the large-diameter portion of the stator shaft is positioned at a predetermined position of the large-diameter portion of the oil pump cover. In a fitted state, a step surface of the oil pump cover that connects the large diameter portion and the small diameter portion of the oil pump cover, and a large diameter portion of the stator shaft that faces the step surface of the oil pump cover. Assembly structure of the stator shaft in the automatic transmission, characterized by being configured so that a gap is formed between the stepped surface of the stator shaft which connects the diameter.
JP11602598A 1998-04-10 1998-04-10 Assembly structure of stator shaft in automatic transmission Expired - Fee Related JP3777491B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11602598A JP3777491B2 (en) 1998-04-10 1998-04-10 Assembly structure of stator shaft in automatic transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11602598A JP3777491B2 (en) 1998-04-10 1998-04-10 Assembly structure of stator shaft in automatic transmission

Publications (2)

Publication Number Publication Date
JPH11294555A JPH11294555A (en) 1999-10-29
JP3777491B2 true JP3777491B2 (en) 2006-05-24

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Publication number Priority date Publication date Assignee Title
JP3626382B2 (en) * 1999-12-09 2005-03-09 本田技研工業株式会社 Flow path structure of press-fit flange member
JP2003314512A (en) 2002-04-25 2003-11-06 Jatco Ltd Fitting mechanism of automatic transmission
KR101103461B1 (en) * 2010-01-14 2012-01-09 명화공업주식회사 Assembling structure for stator shaft of automotive automatic transmission
BE1024354B1 (en) * 2016-07-08 2018-02-06 Punch Powertrain Naamloze Vennootschap Stator support, turbine system, transmission system, method for manufacturing a stator support
CN109114205A (en) * 2017-06-22 2019-01-01 内蒙古欧意德发动机有限公司 Rear case component, speed changer and automobile

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