JP3957451B2

JP3957451B2 - Actuator

Info

Publication number: JP3957451B2
Application number: JP2000287334A
Authority: JP
Inventors: 中雅樹田; 田利昌和
Original assignee: 自動車電機工業株式会社
Priority date: 2000-09-21
Filing date: 2000-09-21
Publication date: 2007-08-15
Anticipated expiration: 2020-09-21
Also published as: JP2002098199A

Description

【０００１】
【発明の属する技術分野】
この発明は、自動車の電動シート装置の駆動源に用いられるアクチュエータに関する。
【０００２】
【従来の技術】
この種のアクチュエータとしては、ケースとカバーの間に中板が配置され、その中板に出力部材を支持する軸受が固定されていた。
【０００３】
【発明が解決しようとする課題】
ところが、前記のアクチュエータでは、中板がビスによってケースに固定されていたため、組み立ての際にねじ止めが必要になり、工数の減少を図り難いという問題点があった。
【０００４】
【発明の目的】
この発明に係わるアクチュエータは、ねじ止めを廃止して工数の減少を図ることができるアクチュエータを提供することを目的としている。
【０００５】
【発明の構成】
【０００６】
【課題を解決するための手段】
この発明の請求項１に係るアクチュエータでは、モータ及び減速機構を収容したケースと、ケースに結合されたカバーと、ケースとカバーとの間に配置されたベース部材とを備えたアクチュエータであって、減速機構は、モータのアーマチュア軸に一体的に形成された歯車部と、ベース部材の一方の面に対向して配置され歯車部に噛合された歯車部材と、ベース部材の他方の面に対向して配置され、歯車部材の回転が伝達される出力部材とを備え、歯車部材は、歯車部に噛合された第１の歯車部材と、この第１の歯車部材に噛合された第２の歯車部材と、この第２の歯車部材に噛合され、出力部材に回転を伝達する第３の歯車部材とから構成され、ベース部材の一方の面には、第１の歯車部材を回転可能に支持するベース部材側第１の軸受部と、第２の歯車部材を回転可能に支持するベース部材側第２の軸受部とが形成され、ベース部材の他方の面には、出力部材を回転可能に支持する出力部材用軸受部が形成され、ケースには、ベース部材が嵌め込まれる複数のベース部材受け部がそれぞれ独立して形成され、カバーには、ケースの各ベース部材受け部に嵌め込まれたベース部材を該各ベース部材受け部とで挟み込む複数のベース部材押さえ部がそれぞれ独立して形成され、ベース部材は、ケースに形成された各ベース部材受け部とカバーに形成された各ベース部材押さえ部とにより挟まれて固定されている構成としたことを特徴としている。
【０００７】
この発明の請求項２に係るアクチュエータでは、請求項１の構成に加え、出力部材には、第３の歯車部材に噛合う歯車形成部が予め定められた厚さ寸法だけ形成されているとともに、歯車形成部の厚さ寸法と略同一の深さ寸法を成して凹設された凹部が形成されている構成としたことを特徴としている。
【０００８】
この発明の請求項３に係るアクチュエータでは、請求項２の構成に加え、ベース部材の他方の面に形成され出力部材を回転可能に支持する出力部材用軸受部は、凹部に挿入可能なように該凹部の形状よりわずかに小さい形状に該ベース部材の他方の面に凸設された凸部からなる構成としたことを特徴としている。
【０００９】
【発明の作用】
この発明に係わるアクチュエータにおいて、一方の面に第１の歯車部材を回転可能に支持するベース部材側第１の軸受部と、第２の歯車部材を回転可能に支持するベース部材側第２の軸受部が形成されるとともに、他方の面に出力部材を回転可能に支持するための出力部材用軸受部が形成されたベース部材は、それぞれ独立した複数のベース部材受け部が形成されたケースと、それぞれ独立した複数のベース部材押さえ部が形成されたカバーとにより、挟まれて強固に固定される。それ故、ベース部材は、ねじ止めされることなく固定される。
【００１０】
【発明の実施の形態】
【００１１】
【実施例】
図１ないし図９には、この発明に係るアクチュエータの一実施例が示されている。
【００１２】
図示するアクチュエータ１は、電動シート装置のランバーサポートを動かすのに用いられ、主として、ケース２、カバー３、ベース部材４、モータ５、減速機構６からなる。減速機構６には、歯車部としてのウォーム軸７、歯車部材としての第１の歯車部材８、第２の歯車部材９、第３の歯車部材１０、及び出力部材１１が備えられている。
【００１３】
ケース２には、四方を囲んで配置された４つの側板２ａ，２ｂ，２ｃ，２ｄの内側に、モータ収容部２ｅ、歯車部材収容部２ｆが形成されている。モータ収容部２ｅには、モータ５が嵌込まれている。歯車部材収容部２ｆには、第１，第２，第３の歯車部材８，９，１０がそれぞれ収容されている。ケース２の歯車部材収容部２ｆ内の底板２ｇには、ケース側第１，第２，第３の軸受部２ｇ１，２ｇ２，２ｇ３がそれぞれ形成されている。ケース側第１，第２，第３の軸受部２ｇ１，２ｇ２，２ｇ３は、それぞれ独立した丸穴状に形成されている。
【００１４】
ケース２の長辺側に配置された一対の側板２ａ，２ｂのうちのひとつの側板２ａのほぼ中央部には、図３に示すようにカバー３が当接する端縁部２ａ１から予め定められた長さ寸法だけ底板２ｇ側に寄った位置であって、ケース２の底板２ｇに平行にベース部材受け部としての第１，第２のベース部材受２ａ２，２ａ３がそれぞれ独立して形成されている。ケース２のもうひとつの側板２ｂのほぼ中央部には、第１，第２のベース部材受２ａ２，２ａ３と同様にして、端縁部２ａ１から予め定められた長さ寸法だけ底板２ｇ側に寄った位置であって、ケース２の底板２ｇに平行にベース部材受け部としての第３のベース部材受２ｂ１が形成されている。
【００１５】
カバー３には、天板３ａの端部寄りに、丸孔にされた出力部材ガイド部３ａ１が形成されている。出力部材ガイド部３ａ１の近傍には、天板３ａの下面３ａ２の一部に、丸穴状に形成されたカバー側軸受部３ａ３が形成されている。天板３ａの下面３ａ２には、ケース２のモータ収容部２ｅの外側に固着された防振部材２ｅ１に向けて棒状に突出したモータ押え３ａ４が形成されているとともに、第１，第２，第３のベース部材受２ａ２，２ａ３，２ｂ１に対応して棒状に突出したベース部材押さえ部としての第１，第２，第３のベース部材押え３ａ５，３ａ６，３ａ７がそれぞれ独立して形成されている。
【００１６】
ベース部材４には、矩形の板形にされたベース部材本体４ａが備えられている。このベース部材本体４ａの他方の面としての上面４ａ１上のほぼ中央部には、出力部材１１に形成された凹部１１ｅの形状よりわずかに小さい円錐台形にされていて、出力部材１１の凹部１１ｅに挿入可能に凸設され、かつ、中心部に出力部材１１を支持する出力部材用軸受部４ａ２が突出された凸部４ｂが形成されている。この出力部材用軸受部４ａ２には、出力部材１１に備えられた第１の軸部１１ａが挿入されて回転可能に支持される。ベース部材本体４ａの下面４ａ３には、ケース２の底板２ｇに形成された第１，第２の軸受部２ｇ１，２ｇ２に対応した位置に歯車部材用軸受部としてのベース部材側第１，第２の軸受部４ａ４，４ａ５がそれぞれ形成されている。
【００１７】
ベース部材４は、ベース部材本体４ａがケース２の第１，第２，第３のベース部材受２ａ２，２ａ３，２ｂ１に嵌め入れられ、ケース２にカバー３が被されることによって、カバー３の第１，第２，第３のベース部材押え３ａ５，３ａ６，３ａ７と、ケース２の第１，第２，第３のベース部材受２ａ２，２ａ３，２ｂ１とにより挟まれてケース２内に固定される。このとき、ベース部材４は、ケース２の底板２ｇに平行に配置される。
【００１８】
モータ５には、第１，第２の電源端子５ａ，５ｂが備えられ、第２の電源端子５ｂには、モータ焼損防止用の素子１２が直列に接続されて図示しない制御回路に電気的に接続される。モータ５に備えられたアーマチュア軸５ｃは、ケース２のモータ収容部２ｅと歯車部材収容部２ｆとの間に取付けられた第１の軸受１３内でカラー１４に結合されている。カラー１４は、ウォーム軸７の一端部に結合されている。ウォーム軸７の他端部は、歯車部材収容部２ｆ内に取付けられた第２の軸受１５に回転可能に支持されている。ウォーム軸７は、第１，第２の軸受１３，１５により回転可能に支持されて、アーマチュア軸５ｃとともに回転する。
【００１９】
ウォーム軸７には、ベース部材４の一方の面としての下面４ａ３に対向して配置された第１の歯車部材８に形成された大径側歯車部８ａが噛合されている。第１の歯車部材８には、上段に配置された大径側歯車部８ａと下段に配置された小径側歯車部８ｂとが一体に形成されている。第１の歯車部材８の中央部には、枢軸挿通孔８ｃが形成されている。枢軸挿通孔８ｃに、第１の枢軸１６が挿通されることによって該第１の歯車部材８は回転可能に支持されている。第１の枢軸１６の基端部１６ａは、ケース２の底板２ｇに形成されたケース側第１の軸受部２ｇ１に固定されている。第１の枢軸１６の先端部１６ｂは、ベース部材４の下面４ａ３に形成されたベース部材側第１の軸受部４ａ４に挿入されることによって支持されている。
【００２０】
第１の歯車部材８の小径側歯車部８ｂには、ベース部材４の一方の面としての下面４ａ３に対向して配置された第２の歯車部材９に形成された大径側歯車部９ｂが噛合されている。第２の歯車部材９には、上段に配置された小径側歯車部９ａと下段に配置された大径側歯車部９ｂとが一体に形成されている。第２の歯車部材９の中央部には、枢軸挿通孔９ｃが形成されている。枢軸挿通孔９ｃに、第２の枢軸１７が挿通されることによって該第２の歯車部材９は回転可能に支持されている。第２の枢軸１７の基端部１７ａは、ケース２の底板２ｇに形成されたケース側第２の軸受部２ｇ２に固定されている。第２の枢軸１７の先端部１７ｂは、ベース部材４の下面４ａ３に形成されたベース部材側第２の軸受部４ａ５に挿入されることによって支持されている。
【００２１】
第２の歯車部材９の小径側歯車部９ａには、ベース部材４の一方の面としての下面４ａ３に対向して配置された第３の歯車部材１０に形成された大径側歯車部１０ｂが噛合されている。第３の歯車部材１０には、上段に配置された小径側歯車部１０ａと下段に配置された大径側歯車部１０ｂとが一体に形成されている。第３の歯車部材１０の中央部には、枢軸挿通孔１０ｃが形成されている。枢軸挿通孔１０ｃに第３の枢軸１８が挿通されることによって該第３の歯車部材１０は回転可能に支持されている。第３の枢軸１８の基端部１８ａは、ケース２の底板２ｇに形成されたケース側第３の軸受部２ｇ３に固定されている。第３の枢軸１８の先端部１８ｂは、カバー３の下面３ａ２に形成されたカバー側軸受部３ａ３に挿入されることによって支持されている。
【００２２】
第３の歯車部材１０の小径側歯車部１０ａには、ベース部材４の他方の面としての上面４ａ１に対向して配置された出力部材１１に形成された歯車部１１ｂが噛合されている。出力部材１１には、歯車部１１ｂの下面の中央部に第１の軸部１１ａが下方に向けて突出形成されている。出力部材１１には、歯車形成部１１ｂ上に第２の軸部１１ｃが形成されている。第２の軸部１１ｃの外径寸法は、カバー３の出力部材ガイド部３ａ１の内径寸法よりもわずかに小さいため、この第２の軸部１１ｃは、カバー３の出力部材ガイド部３ａ１によって回転可能に支持されている。出力部材１１の第２の軸部１１ｃの上側には、出力端部１１ｄが形成されている。出力端部１１ｄは、図示しない電動シート装置に備えられた駆動機構に連結される。出力部材１１には、歯車形成部１１ｂの厚さ寸法と略同一の深さ寸法を成して凹設された凹部１１ｅが形成されている。
【００２３】
上述したように、ベース部材４の上面（他方の面）４ａ１には、出力部材１１を回転可能に支持するための出力部材用軸受部４ａ２が形成されるとともに、ベース部材４の下面（一方の面）４ａ３には、第１の歯車部材８を回転可能に支持するためのベース部材側第１の軸受部４ａ４と、第２の歯車部材９を回転可能に支持するためのベース部材側第２の軸受部４ａ５がそれぞれ形成されている。また、ケース２には、それぞれ独立した第１，第２，第３のベース部材受２ａ２，２ａ３，２ｂ１が形成され、カバー３には、それぞれ独立した第１，第２，第３のベース部材押え３ａ５，３ａ６，３ａ７が形成されている。ベース部材４は、ベース部材本体４ａがケース２の第１，第２，第３のベース部材受２ａ２，２ａ３，２ｂ１に嵌め入れられ、ケース２にカバー３が被されることによって、ベース部材４は、ねじ止めされることなく、カバー３の第１，第２，第３のベース部材押え３ａ５，３ａ６，３ａ７と、ケース２の第１，第２，第３のベース部材受２ａ２，２ａ３，２ｂ１とにより挟まれて強固に固定される。
【００２４】
このようなアクチュエータ１は、制御回路に備えられたスイッチが突出側にオンされると、第１，第２の電源端子５ａ，５ｂに対し正方向に電流が供給されることによって、モータ５のアーマチュア軸５ｃが正回転され、ウォーム軸７、第１の歯車部材８、第２の歯車部材９、第３の歯車部材１０を介し動力が伝達されて出力部材１１が回転され、この出力部材１１の回転により電動シート装置の駆動機構がシート表面を突出させる。これに反し、スイッチが収納側にオンされると、第１，第２の電源端子５ａ，５ｂに対し逆方向に電流が供給されることによって電動シート装置の駆動機構により突出されているシート表面を通常の平らな状態に戻す。
【００２５】
【発明の効果】
以上説明してきたように、この発明の請求項１に係るアクチュエータによれば、一方の面に第１の歯車部材を回転可能に支持するベース部材側第１の軸受部と、第２の歯車部材を回転可能に支持するベース部材側第２の軸受部が形成されるとともに、他方の面に出力部材を回転可能に支持するための出力部材用軸受部が形成されたベース部材と、それぞれ独立した複数のベース部材受け部が形成されたケースと、それぞれ独立した複数のベース部材押さえ部が形成されたカバーとを備え、ベース部材は、ケースに形成された各ベース部材受け部とカバーに形成された各ベース部材押さえ部とにより挟まれて強固に固定される。それ故、ベース部材は、ねじ止めされることなく固定される。よって、ねじ止めを廃止して工数の減少を図ることができるという優れた効果を奏する。また、ベース部材の両面を利用してベース部材側第１の軸受部とベース部材側第２の軸受部と出力部材用軸受部を形成しているので、第１，第２，第３の歯車部材を有する減速機構を備えたアクチュエータであっても、スペースの有効利用が図れ、アクチュエータの小型化が可能となる。
【００２６】
この発明の請求項２、３に係るアクチュエータによれば、出力部材には、第３の歯車部材に噛合う歯車形成部が予め定められた厚さ寸法だけ形成されているとともに、歯車形成部の厚さ寸法と略同一の深さ寸法を成して凹設された凹部が形成され、ベース部材の他方の面に形成された出力部材用軸受部は、凹部に挿入可能なように該ベース部材の他方の面に凸設された凸部からなる構成として、ベース部材の両面をより有効に利用している。それ故、更なるスペースの有効利用が図れ、該アクチュエータの一層の小型化が可能となる。
【図面の簡単な説明】
【図１】この発明に係るアクチュエータの一実施例の内部構造を説明する断面図である。
【図２】図１に示したアクチュエータにおいてカバーを取り外した状態の平面図である。
【図３】図２に示したアクチュエータにおいて出力部材とベース部材を取り外した状態の平面図である。
【図４】図１に示したアクチュエータにおいてのカバーとベース部材との外観斜視図である。
【図５】図１に示したアクチュエータに用いられたベース部材の平面図である。
【図６】図５に示したベース部材の正面図である。
【図７】図５に示したベース部材の底面図である。
【図８】図５に示したベース部材においての出力部材軸受部まわりの断面図である。
【図９】図５に示したベース部材においてのベース部材側第１、第２の軸受部まわりの断面図である。
【符号の説明】
１アクチュエータ
２ケース
２ａ２（ベース部材受け部）第１のベース部材受
２ａ３（ベース部材受け部）第２のベース部材受
２ｂ１（ベース部材受け部）第３のベース部材受
２ｇ１ケース側第１の軸受部
２ｇ２ケース側第２の軸受部
３カバー
３ａ５（ベース部材押さえ部）第１のベース部材押え
３ａ６（ベース部材押さえ部）第２のベース部材押え
３ａ７（ベース部材押さえ部）第３のベース部材押え
４ベース部材
４ａ１（他方の面）上面
４ａ２出力部材用軸受部
４ａ３（一方の面）下面
４ａ４（歯車部材用軸受部）ベース部材側第１の軸受部
４ａ５（歯車部材用軸受部）ベース部材側第２の軸受部
４ｂ凸部
５モータ
５ｃアーマチュア軸
６減速機構
７（歯車部）ウォーム軸
８（歯車部材）第１の歯車部材
９（歯車部材）第２の歯車部材
１０（歯車部材）第３の歯車部材
１１出力部材
１１ａ第１の軸部
１１ｂ歯車形成部
１１ｅ凹部 [0001]
BACKGROUND OF THE INVENTION
The present invention relates to an actuator used as a drive source for an electric seat device of an automobile.
[0002]
[Prior art]
As this type of actuator, an intermediate plate is disposed between a case and a cover, and a bearing that supports an output member is fixed to the intermediate plate.
[0003]
[Problems to be solved by the invention]
However, the above-described actuator has a problem in that it is difficult to reduce the number of man-hours because the middle plate is fixed to the case with screws, so that screwing is required during assembly.
[0004]
OBJECT OF THE INVENTION
An object of the present invention is to provide an actuator capable of reducing the number of steps by eliminating screwing.
[0005]
[Structure of the invention]
[0006]
[Means for Solving the Problems]
The actuator according to claim 1 of the present invention is an actuator including a case housing a motor and a speed reduction mechanism, a cover coupled to the case, and a base member disposed between the case and the cover, The speed reduction mechanism has a gear portion formed integrally with the armature shaft of the motor, a gear member arranged to face one surface of the base member and meshed with the gear portion, and the other surface of the base member. And an output member to which the rotation of the gear member is transmitted. The gear member includes a first gear member meshed with the gear portion and a second gear member meshed with the first gear member. And a third gear member that meshes with the second gear member and transmits the rotation to the output member, and a base member that rotatably supports the first gear member is provided on one surface of the base member. Member side first bearing section A base member side second bearing portion rotatably supporting the second gear member is formed on the other surface of the base member, the bearing portion for the output member rotatably supports is formed an output member In the case, a plurality of base member receiving portions into which the base member is fitted are formed independently, and in the cover, a base member fitted into each base member receiving portion of the case is connected to each base member receiving portion. A plurality of base member pressing portions to be sandwiched are formed independently, and the base member is sandwiched and fixed by each base member receiving portion formed on the case and each base member pressing portion formed on the cover It is characterized by that.
[ 0007 ]
In the actuator according to claim 2 of the present invention, in addition to the configuration of claim 1 , the output member is formed with a gear forming portion that meshes with the third gear member in a predetermined thickness dimension, The present invention is characterized in that a recess is formed that has a depth dimension substantially the same as the thickness dimension of the gear forming part.
[ 0008 ]
In the actuator according to a third aspect of the present invention, in addition to the configuration of the second aspect, the output member bearing portion that is formed on the other surface of the base member and rotatably supports the output member can be inserted into the recess. The present invention is characterized in that it is constituted by a convex portion projecting on the other surface of the base member in a shape slightly smaller than the shape of the concave portion.
[ 0009 ]
[Effects of the Invention]
In the actuator according to the present invention, a base member side first bearing portion that rotatably supports the first gear member on one surface, and a base member side second bearing that rotatably supports the second gear member. with part is formed, the base member in which the output bearing section member is formed for rotatably supporting the output member to the other surface, and each independently plurality of base members receiving portions are formed casing, It is sandwiched and firmly fixed by a cover on which a plurality of independent base member pressing portions are formed. Therefore, the base member is fixed without being screwed.
[ 0010 ]
DETAILED DESCRIPTION OF THE INVENTION
[ 0011 ]
【Example】
1 to 9 show an embodiment of an actuator according to the present invention.
[ 0012 ]
The illustrated actuator 1 is used to move the lumbar support of the electric seat device, and mainly includes a case 2, a cover 3, a base member 4, a motor 5, and a speed reduction mechanism 6. The speed reduction mechanism 6 includes a worm shaft 7 as a gear portion, a first gear member 8 as a gear member, a second gear member 9, a third gear member 10, and an output member 11.
[ 0013 ]
In the case 2, a motor housing portion 2 e and a gear member housing portion 2 f are formed inside four side plates 2 a, 2 b, 2 c, 2 d disposed so as to surround the four sides. The motor 5 is fitted in the motor housing portion 2e. The gear member housing portion 2f houses the first, second and third gear members 8, 9, and 10, respectively. Case-side first, second, and third bearing portions 2g1, 2g2, and 2g3 are formed on the bottom plate 2g in the gear member housing portion 2f of the case 2, respectively. The case side first, second, and third bearing portions 2g1, 2g2, and 2g3 are each formed in an independent round hole shape.
[ 0014 ]
As shown in FIG. 3, an end edge 2a1 with which the cover 3 abuts is determined in advance at a substantially central portion of one side plate 2a of the pair of side plates 2a and 2b arranged on the long side of the case 2. The first and second base member receivers 2a2 and 2a3 as base member receiving portions are formed independently of each other at a position close to the bottom plate 2g side by the length dimension and parallel to the bottom plate 2g of the case 2. . Similar to the first and second base member receivers 2a2 and 2a3, the center plate of the other side plate 2b of the case 2 approaches the bottom plate 2g side by a predetermined length from the end edge 2a1. A third base member receiver 2b1 is formed as a base member receiver in parallel with the bottom plate 2g of the case 2.
[ 0015 ]
The cover 3 is formed with an output member guide portion 3a1 having a round hole near the end of the top plate 3a. In the vicinity of the output member guide portion 3a1, a cover side bearing portion 3a3 formed in a round hole shape is formed on a part of the lower surface 3a2 of the top plate 3a. On the lower surface 3a2 of the top plate 3a, there is formed a motor presser 3a4 protruding in a rod shape toward the vibration isolating member 2e1 fixed to the outside of the motor housing portion 2e of the case 2, and the first, second and second First, second, and third base member pressers 3a5, 3a6, and 3a7 are formed independently as base member pressers protruding in a bar shape corresponding to the three base member receivers 2a2, 2a3, and 2b1. .
[ 0016 ]
The base member 4 is provided with a base member body 4a having a rectangular plate shape. The substantially central portion on the upper surface 4a1 as the other surface of the base member main body 4a has a truncated cone shape slightly smaller than the shape of the recess 11e formed in the output member 11, and the recess 11e of the output member 11 insertably it is projectingly, and the convex portion 4b which is an output member bearing portion 4a2 protruded for supporting the output member 11 in the center is formed. The first shaft portion 11a provided in the output member 11 is inserted into the output member bearing portion 4a2 and is rotatably supported. The lower surface 4a3 of the base member main body 4a has first and second base member side first and second gear member bearing portions at positions corresponding to the first and second bearing portions 2g1 and 2g2 formed on the bottom plate 2g of the case 2. The bearing portions 4a4 and 4a5 are respectively formed.
[ 0017 ]
The base member 4 is configured such that the base member main body 4a is fitted into the first, second, and third base member receivers 2a2, 2a3, and 2b1 of the case 2, and the cover 3 is covered with the case 2, thereby The first, second and third base member pressers 3a5, 3a6 and 3a7 and the first, second and third base member holders 2a2, 2a3 and 2b1 of the case 2 are sandwiched and fixed in the case 2. The At this time, the base member 4 is disposed in parallel to the bottom plate 2 g of the case 2.
[ 0018 ]
The motor 5 includes first and second power supply terminals 5a and 5b. A motor burnout prevention element 12 is connected in series to the second power supply terminal 5b and electrically connected to a control circuit (not shown). Connected. The armature shaft 5c provided in the motor 5 is coupled to the collar 14 in the first bearing 13 attached between the motor housing portion 2e of the case 2 and the gear member housing portion 2f. The collar 14 is coupled to one end of the worm shaft 7. The other end portion of the worm shaft 7 is rotatably supported by a second bearing 15 attached in the gear member housing portion 2f. The worm shaft 7 is rotatably supported by the first and second bearings 13 and 15 and rotates together with the armature shaft 5c.
[ 0019 ]
The worm shaft 7 is meshed with a large-diameter side gear portion 8 a formed on the first gear member 8 disposed to face the lower surface 4 a 3 as one surface of the base member 4. The first gear member 8 is integrally formed with a large-diameter side gear portion 8a disposed in the upper stage and a small-diameter side gear section 8b disposed in the lower stage. A pivot insertion hole 8 c is formed at the center of the first gear member 8. The first gear member 8 is rotatably supported by inserting the first pivot 16 into the pivot insertion hole 8c. A base end portion 16 a of the first pivot 16 is fixed to a case-side first bearing portion 2 g 1 formed on the bottom plate 2 g of the case 2. The distal end portion 16 b of the first pivot 16 is supported by being inserted into a base member side first bearing portion 4 a 4 formed on the lower surface 4 a 3 of the base member 4.
[ 0020 ]
The small-diameter side gear portion 8b of the first gear member 8 has a large-diameter side gear portion 9b formed on the second gear member 9 disposed to face the lower surface 4a3 as one surface of the base member 4. Meshed. The second gear member 9 is integrally formed with a small-diameter side gear portion 9a disposed in the upper stage and a large-diameter side gear section 9b disposed in the lower stage. A pivot insertion hole 9 c is formed at the center of the second gear member 9. The second gear member 9 is rotatably supported by inserting the second pivot 17 into the pivot insertion hole 9c. A base end portion 17 a of the second pivot 17 is fixed to a case-side second bearing portion 2 g 2 formed on the bottom plate 2 g of the case 2. The distal end portion 17b of the second pivot 17 is supported by being inserted into a base member side second bearing portion 4a5 formed on the lower surface 4a3 of the base member 4.
[ 0021 ]
The small-diameter side gear portion 9 a of the second gear member 9 has a large-diameter side gear portion 10 b formed on the third gear member 10 disposed to face the lower surface 4 a 3 as one surface of the base member 4. Meshed. The third gear member 10 is integrally formed with a small-diameter side gear portion 10a disposed in the upper stage and a large-diameter side gear section 10b disposed in the lower stage. A pivot insertion hole 10 c is formed at the center of the third gear member 10. The third gear member 10 is rotatably supported by inserting the third pivot 18 into the pivot insertion hole 10c. A base end portion 18 a of the third pivot 18 is fixed to a case-side third bearing portion 2 g 3 formed on the bottom plate 2 g of the case 2. The tip 18b of the third pivot 18 is supported by being inserted into a cover-side bearing 3a3 formed on the lower surface 3a2 of the cover 3.
[ 0022 ]
The small-diameter side gear portion 10a of the third gear member 10 meshes with a gear portion 11b formed on the output member 11 disposed to face the upper surface 4a1 as the other surface of the base member 4. In the output member 11, a first shaft portion 11a is formed so as to protrude downward at the center of the lower surface of the gear portion 11b. In the output member 11, a second shaft portion 11c is formed on the gear forming portion 11b. Since the outer diameter of the second shaft portion 11 c is slightly smaller than the inner diameter of the output member guide portion 3 a 1 of the cover 3, the second shaft portion 11 c can be rotated by the output member guide portion 3 a 1 of the cover 3. It is supported by. On the upper side of the second shaft portion 11c of the output member 11, an output end portion 11d is formed. The output end portion 11d is connected to a drive mechanism provided in an electric sheet device (not shown). The output member 11 is formed with a recess 11e that is recessed so as to have a depth dimension substantially the same as the thickness dimension of the gear forming portion 11b.
[ 0023 ]
As described above, the upper surface (the other surface) 4a1 of the base member 4 is formed with the output member bearing portion 4a2 for rotatably supporting the output member 11, and the lower surface (one of the base members 4). The surface) 4a3 includes a base member side first bearing portion 4a4 for rotatably supporting the first gear member 8, and a base member side second for rotatably supporting the second gear member 9. The bearing portions 4a5 are respectively formed. The case 2 is formed with independent first, second and third base member receivers 2a2, 2a3 and 2b1, and the cover 3 is provided with independent first, second and third base members. The pressers 3a5, 3a6, 3a7 are formed. The base member 4 is configured such that the base member body 4a is fitted into the first, second, and third base member receivers 2a2, 2a3, and 2b1 of the case 2 and the case 3 is covered with the cover 3 so that the base member 4 is covered. The first, second and third base member pressers 3a5, 3a6 and 3a7 of the cover 3 and the first, second and third base member holders 2a2, 2a3 of the case 2 are not screwed. 2b1 and firmly fixed.
[ 0024 ]
Such an actuator 1 is configured such that when a switch provided in the control circuit is turned on to the protruding side, a current is supplied in the positive direction to the first and second power supply terminals 5a and 5b. The armature shaft 5c is rotated forward, power is transmitted through the worm shaft 7, the first gear member 8, the second gear member 9, and the third gear member 10, and the output member 11 is rotated. The drive mechanism of the electric sheet device causes the sheet surface to protrude by the rotation of the motor. On the other hand, when the switch is turned on to the storage side, a current is supplied to the first and second power supply terminals 5a and 5b in the opposite direction, thereby projecting the sheet surface from the drive mechanism of the electric seat device. Return to normal flat condition.
[ 0025 ]
【The invention's effect】
As described above, according to the actuator of the first aspect of the present invention, the first bearing portion on the base member side that rotatably supports the first gear member on one surface, and the second gear member The base member side second bearing portion for rotatably supporting the output member and the base member having the output member bearing portion for rotatably supporting the output member on the other surface are independent of each other. A case in which a plurality of base member receiving portions are formed and a cover in which a plurality of independent base member pressing portions are formed, and the base member is formed on each base member receiving portion and the cover formed in the case. The base member pressing portions are sandwiched and firmly fixed . Therefore, the base member is fixed without being screwed. Therefore, there is an excellent effect that screwing can be abolished and man-hours can be reduced. Further, since the base member side first bearing portion, the base member side second bearing portion, and the output member bearing portion are formed by using both surfaces of the base member , the first, second, and third gears are formed. Even an actuator provided with a speed reduction mechanism having members can effectively use space and downsize the actuator.
[ 0026 ]
According to actuator according to claim 2 of the present invention, the output member, with meshing tooth decay wheel forming part is formed by a thickness dimension predetermined for the third gear member, the gear forming section A recess is formed with a depth dimension substantially the same as the thickness dimension, and the output member bearing portion formed on the other surface of the base member is inserted into the recess so that it can be inserted into the recess. As a configuration composed of convex portions provided on the other surface, both surfaces of the base member are used more effectively. Therefore, the space can be used more effectively and the actuator can be further downsized.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating the internal structure of an embodiment of an actuator according to the present invention.
FIG. 2 is a plan view of the actuator shown in FIG. 1 with a cover removed.
3 is a plan view showing a state where an output member and a base member are removed from the actuator shown in FIG. 2; FIG.
4 is an external perspective view of a cover and a base member in the actuator shown in FIG. 1. FIG.
5 is a plan view of a base member used in the actuator shown in FIG. 1. FIG.
6 is a front view of the base member shown in FIG. 5. FIG.
FIG. 7 is a bottom view of the base member shown in FIG.
8 is a cross-sectional view around an output member bearing portion in the base member shown in FIG.
9 is a sectional view around the base member side first and second bearing portions in the base member shown in FIG. 5;
[Explanation of symbols]
1 Actuator 2 Case 2a2 (Base member receiving portion) First base member receiving portion 2a3 (Base member receiving portion) Second base member receiving portion 2b1 (Base member receiving portion) Third base member receiving portion 2g1 Case side first bearing Portion 2g2 Case-side second bearing portion 3 Cover 3a5 (base member pressing portion) first base member presser 3a6 (base member pressing portion) second base member presser 3a7 (base member pressing portion) third base member presser 4 Base member 4a1 (Other surface) Upper surface 4a2 Output member bearing portion 4a3 (One surface) Lower surface 4a4 (Gear member bearing portion) Base member side first bearing portion 4a5 (Gear member bearing portion) Base member side Second bearing portion 4b Convex portion 5 Motor 5c Armature shaft 6 Reduction mechanism 7 (Gear portion) Worm shaft 8 (Gear member) First gear member 9 (Gear member) Second Gear member 10 (the gear member) third gear member 11 the output member 11a first shaft portion 11b gear forming section
11e recess

Claims

An actuator comprising a case housing a motor and a speed reduction mechanism, a cover coupled to the case, and a base member disposed between the case and the cover, wherein the speed reduction mechanism A gear part integrally formed on the armature shaft, a gear member arranged to face one surface of the base member and meshed with the gear part, and arranged to face the other surface of the base member And an output member to which the rotation of the gear member is transmitted. The gear member includes a first gear member meshed with the gear portion and a second gear member meshed with the first gear member. And a third gear member that meshes with the second gear member and transmits the rotation to the output member, and the first gear member is rotatable on one surface of the base member. Supporting base member side A first bearing portion, and the base member side second bearing portion of the second gear member rotatably supported is formed on the other surface of said base member, for rotatably supporting said output member An output member bearing portion is formed, and a plurality of base member receiving portions into which the base member is fitted are formed independently in the case, and the cover is fitted into each base member receiving portion of the case. In addition, a plurality of base member pressing portions for sandwiching the base member between the base member receiving portions are formed independently, and the base member is formed on the base member receiving portions and the cover formed on the case. An actuator characterized in that the actuator is sandwiched and fixed by the base member pressing portions.

The output member is formed with a gear forming portion that meshes with the third gear member in a predetermined thickness, and has a depth that is substantially the same as the thickness of the gear forming portion. The actuator according to claim 1 , wherein a recessed portion is formed.

The output member bearing portion formed on the other surface of the base member and rotatably supporting the output member has a shape slightly smaller than the shape of the recess so as to be inserted into the recess. The actuator according to claim 2 , wherein the actuator is a convex portion provided on the surface of the actuator.