JPH0979298A - Linear actuator - Google Patents
Linear actuatorInfo
- Publication number
- JPH0979298A JPH0979298A JP7237049A JP23704995A JPH0979298A JP H0979298 A JPH0979298 A JP H0979298A JP 7237049 A JP7237049 A JP 7237049A JP 23704995 A JP23704995 A JP 23704995A JP H0979298 A JPH0979298 A JP H0979298A
- Authority
- JP
- Japan
- Prior art keywords
- screw shaft
- screw
- sun
- output member
- linear motion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
- F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
-
- 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
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
- F16D2121/24—Electric or magnetic using motors
-
- 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
- F16D2125/00—Components of actuators
- F16D2125/18—Mechanical mechanisms
- F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
- F16D2125/34—Mechanical mechanisms converting rotation to linear movement or vice versa acting in the direction of the axis of rotation
- F16D2125/40—Screw-and-nut
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
(57)【要約】
【課題】 少ない構成部品数で、滑らかで迅速な進退動
作を確保すると共に、微小な変位量の制御ができて、装
置の小型・軽量化や製造コストの低減に適した直線動ア
クチュエータを得る。
【解決手段】 モータ５によって回転駆動される太陽ね
じ軸８と、該太陽ねじ軸８の周囲を同軸状に囲う筒状部
１０の内周には前記太陽ねじ軸８とは逆ねじの雌ねじ１
４が形成されて軸線方向にのみ進退可能な出力部材１１
と、前記太陽ねじ軸８と出力部材１１の筒状部１０との
間の隙間に挿通されて太陽ねじ軸８回りの転動及び軸線
方向への進退動により太陽ねじ軸８の回転運動を前記出
力部材１１の直線運動に変換する遊星ねじ軸１２とを備
える。
(57) 【Abstract】 PROBLEM TO BE SOLVED: To secure a smooth and quick forward / backward movement with a small number of constituent parts and to control a minute displacement amount, which is suitable for reducing the size and weight of the device and reducing the manufacturing cost. Obtain a linear actuator. SOLUTION: A sun screw shaft 8 which is rotationally driven by a motor 5, and a female screw 1 which is a reverse screw to the sun screw shaft 8 is provided on the inner circumference of a cylindrical portion 10 which surrounds the sun screw shaft 8 coaxially.
4 is formed and is capable of advancing and retracting only in the axial direction.
And the rotary movement of the sun screw shaft 8 is inserted into the gap between the sun screw shaft 8 and the tubular portion 10 of the output member 11 to roll around the sun screw shaft 8 and move back and forth in the axial direction. And a planetary screw shaft 12 that converts the output member 11 into a linear motion.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、モータの回転力を
直線運動に変換して出力する直線動アクチュエータに関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motion actuator that converts a rotational force of a motor into a linear motion and outputs the linear motion.
【０００２】[0002]
【従来の技術】これまで、車両等のディスクブレーキと
して、いわゆる電動式ディスクブレーキとよばれるタイ
プのもの、即ち、モータの回転力を直線運動に変換して
出力する直線動アクチュエータを用いて、ディスクに対
するブレーキパッドの進退動作を制御する構成のもの
が、種々研究されている。2. Description of the Related Art Heretofore, as a disc brake of a vehicle or the like, a so-called electric disc brake, that is, a disc using a linear actuator that converts a rotational force of a motor into a linear motion and outputs the linear motion is disclosed. Various types of structures for controlling the forward / backward movement of the brake pad have been studied.
【０００３】ブレーキパッドを進退動作させるアクチュ
エータには、進退動作が滑らかかつ迅速にでき、しか
も、微小な変位量の制御ができ、さらに、強大な駆動力
を発揮し得ることが要求される。そこで、これらの要件
を満たすために、従来のアクチュエータでは、高減速比
の歯車減速機構とリードの大きいボールねじ機構を組み
合わせたものが提案されている（特表平２−５０２１１
５号公報参照）。An actuator for moving a brake pad forward and backward is required to be able to smoothly and quickly perform forward and backward movements, to control a minute amount of displacement, and to exert a powerful driving force. Therefore, in order to meet these requirements, a combination of a gear reduction mechanism with a high reduction ratio and a ball screw mechanism with a large lead has been proposed as a conventional actuator (see Japanese Patent Publication No. 2-50211).
No. 5).
【０００４】[0004]
【発明が解決しようとする課題】ところが、高減速比の
歯車減速機構とリードの大きいボールねじ機構の組み合
わせは、構成部品数が多く、構成が複雑になり、装置の
大型化や重量化、更には製造コストの高額化といった不
都合を招き、また、動力の伝達効率の向上を図る上でも
不利になるという問題があった。However, the combination of a gear reduction mechanism having a high reduction ratio and a ball screw mechanism having a large lead has a large number of constituent parts, which complicates the construction, and makes the device larger and heavier. However, there is a problem in that the manufacturing cost is increased and it is also disadvantageous in improving the power transmission efficiency.
【０００５】本発明の目的は上記課題を解消することに
あり、少ない構成部品数でありながら滑らかで迅速な進
退動作を確保すると共に、微小な変位量の制御ができ、
さらに、強大な駆動力を発揮することもできて、装置の
小型化や軽量化に加えて、製造コストの低減を図ること
ができ、また、動力の伝達効率の向上にも適した直線動
アクチュエータを提供することにある。An object of the present invention is to solve the above-mentioned problems, and it is possible to secure a smooth and quick forward / backward movement with a small number of constituent parts and to control a minute displacement amount.
Furthermore, it is possible to exert a powerful driving force, and in addition to downsizing and weight reduction of the device, it is possible to reduce the manufacturing cost, and also a linear actuator suitable for improving power transmission efficiency. To provide.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
の本発明に係る直線動アクチュエータは、モータの回転
力を直線運動に変換して出力する直線動アクチュエータ
であって、外周に雄ねじが形成されると共にハウジング
に回転自在に支持されて前記モータによって回転駆動さ
れる太陽ねじ軸と、前記太陽ねじ軸の周囲を同軸状に囲
う筒状部の内周には前記太陽ねじ軸の雄ねじに対して逆
ねじとなる雌ねじが形成されて、前記太陽ねじ軸の軸線
方向にのみ進退可能に前記ハウジングに支持された出力
部材と、前記太陽ねじ軸と出力部材の筒状部との間の隙
間に挿通され、外周には前記太陽ねじ軸の雄ねじに対し
て逆ねじで、該太陽ねじ軸の雄ねじに転動可能に外接す
ると共に、前記出力部材の筒状部の雌ねじに転動可能に
内接する雄ねじが形成された複数個の遊星ねじ軸とを具
備する構成を成し、前記太陽ねじ軸の回転を、前記遊星
ねじ軸の太陽ねじ軸回りの転動及び太陽ねじ軸の軸線方
向への進退動を介して、前記出力部材の直線運動に変換
して、該出力部材に連結される作動対象物に所定の直線
運動を付与することを特徴とする。A linear motion actuator according to the present invention for achieving the above object is a linear motion actuator which converts a rotational force of a motor into a linear motion and outputs the linear motion, and a male screw is formed on an outer periphery thereof. And a sun screw shaft that is rotatably supported by a housing and is driven to rotate by the motor, and a cylindrical portion that coaxially surrounds the sun screw shaft has an inner circumference with respect to the male screw of the sun screw shaft. And an output screw supported by the housing so as to be capable of advancing and retracting only in the axial direction of the sun screw shaft, and a gap between the sun screw shaft and the tubular portion of the output member. It is inserted into the outer periphery of the male screw of the sun screw shaft by a reverse screw so as to be rotatably circumscribed on the male screw of the sun screw shaft and inscribed rotatably on the female screw of the tubular portion of the output member. Male screw And a plurality of planetary screw shafts formed, the rotation of the sun screw shaft, the rotation of the planetary screw shaft around the sun screw shaft and the forward and backward movement in the axial direction of the sun screw shaft. The output member is converted into a linear motion via the output member, and a predetermined linear motion is applied to the operation target connected to the output member.
【０００７】あるいは、前記太陽ねじ軸の雄ねじ及び前
記出力部材の筒状部の雌ねじ及び前記遊星ねじ軸の雄ね
じのそれぞれのねじ相互間の条数比と有効径比とを適宜
値に設定することで、該出力部材に所定の直線運動性能
を確保することを特徴としたものである。Alternatively, the thread number ratio and the effective diameter ratio between the respective threads of the male screw of the sun screw shaft, the female screw of the tubular portion of the output member and the male screw of the planetary screw shaft are set to appropriate values. Then, a predetermined linear movement performance is ensured in the output member.
【０００８】そして、太陽ねじ軸の回転を遊星ねじ軸を
介して出力部材の直線運動に変換するので、太陽ねじ軸
と出力部材との間に介在する遊星ねじ軸と太陽ねじ軸と
の接触や遊星ねじ軸と出力部材との接触は、いずれも転
がり接触となるため、少ない構成部品数でありながら滑
らかな進退動作を確保することができる。また、各ねじ
を多条ねじとすることによってリードを大きくして、進
退動作を迅速化することもできる。Further, since the rotation of the sun screw shaft is converted into the linear motion of the output member via the planet screw shaft, contact between the planet screw shaft and the sun screw shaft interposed between the sun screw shaft and the output member and Since the contact between the planetary screw shaft and the output member is rolling contact, a smooth forward / backward movement can be ensured with a small number of components. Also, by making each screw a multi-start screw, the lead can be made larger and the forward / backward movement can be speeded up.
【０００９】太陽ねじ軸のねじに対して、遊星ねじ軸お
よび出力部材のねじを逆ねじにしたことで、遊星ねじ軸
および出力部材の直線移動方向が逆向きになり、それぞ
れの移動量が相殺されることによって、出力部である出
力部材には、微小な変位量の制御が可能になる。この微
小な変位量の制御という点に関しては、それぞれのねじ
相互間の条数比と有効径比とを適宜値に設定すること
で、さらに最適化することができる。また、ねじの組み
合わせで出力部材を送り出す機構であるため、強大な駆
動力を発揮することもできる。By making the screw of the planetary screw shaft and the screw of the output member reverse to the screw of the sun screw shaft, the linear movement directions of the planetary screw shaft and the output member become opposite, and the respective movement amounts cancel each other out. By doing so, it becomes possible to control a minute displacement amount in the output member that is the output unit. Regarding the control of this minute displacement amount, it can be further optimized by setting the thread ratio and the effective diameter ratio between the respective screws to appropriate values. Further, since it is a mechanism that sends out the output member with a combination of screws, it is possible to exert a great driving force.
【００１０】また、高減速比の歯車減速機構とリードの
大きいボールねじ機構とを組み合わせた従来のアクチュ
エータと比較して、構成部品点数が少なく、動力の伝達
経路を単純にすることができるため、動力の伝達効率の
向上にも適する。Further, compared with the conventional actuator in which a gear reduction mechanism having a high reduction ratio and a ball screw mechanism having a large lead are combined, the number of constituent parts is small and the power transmission path can be simplified. Also suitable for improving power transmission efficiency.
【００１１】[0011]
【発明の実施の形態】以下、本発明に係る直線動アクチ
ュエータの好適な実施の形態を図面を参照して詳細に説
明する。図１乃至図３は本発明に係る直線動アクチュエ
ータの一実施形態を示したもので、図１は直線動アクチ
ュエータを車両用のディスクブレーキのブレーキパッド
の進退動に利用した場合の縦断面図、図２は直線動アク
チュエータを構成しているねじ部材相互の接触状態を示
す説明図、図３は直線動アクチュエータに使用されてい
る遊星ねじ軸を保持するケースの斜視図である。BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a linear motion actuator according to the present invention will be described in detail below with reference to the drawings. 1 to 3 show an embodiment of a linear motion actuator according to the present invention. FIG. 1 is a vertical cross-sectional view of the linear motion actuator used for advancing and retracting a brake pad of a vehicle disc brake, FIG. 2 is an explanatory view showing a contact state between screw members constituting the linear motion actuator, and FIG. 3 is a perspective view of a case which holds a planetary screw shaft used in the linear motion actuator.
【００１２】この直線動アクチュエータ１は、モータ５
の出力軸の回転力を直線運動に変換して出力するもの
で、外周に雄ねじ６が形成されると共にハウジング７に
回転自在に支持されモータ５によって回転駆動される太
陽ねじ軸８と、該太陽ねじ軸８周囲を同軸状に囲う筒状
部１０を有して前記太陽ねじ軸８の軸線方向にのみ進退
可能に前記ハウジング７に支持された出力部材１１と、
前記太陽ねじ軸８と出力部材１１の筒状部１０との間の
隙間に挿通された３本の遊星ねじ軸１２とから構成され
ている。This linear motion actuator 1 includes a motor 5
Which converts the rotational force of the output shaft into a linear motion and outputs the linear motion. A sun screw shaft 8 is formed on the outer periphery and is rotatably supported by a housing 7 and rotatably driven by a motor 5, and the sun. An output member 11 having a tubular portion 10 that coaxially surrounds the screw shaft 8 and supported by the housing 7 so as to be movable back and forth only in the axial direction of the sun screw shaft 8.
It is composed of three planetary screw shafts 12 inserted into a gap between the sun screw shaft 8 and the cylindrical portion 10 of the output member 11.
【００１３】ここに、前記ハウジング７は、ディスクブ
レーキ２のキャリパーＫと一体構造である。前記筒状部
１０の内周には、前記太陽ねじ軸８の雄ねじ６に対して
逆ねじとなる雌ねじ１４が形成されている。また、出力
部材１１は、前記筒状部１０の先端に、作動対象物であ
る一対のうちの一方のブレーキパッド３に連結される作
用部１５を一体形成した構成をなしている。該出力部材
１１は、図示はしていないが、太陽ねじ軸８の軸線方向
に沿って前記ハウジング７に形成されたガイド溝に係合
する案内突起が外周部に装備されていて、太陽ねじ軸８
の軸線方向にのみ運動可能にされている。Here, the housing 7 is integrally structured with the caliper K of the disc brake 2. A female screw 14 that is a reverse screw to the male screw 6 of the sun screw shaft 8 is formed on the inner circumference of the tubular portion 10. Further, the output member 11 has a structure in which an action portion 15 connected to one of the pair of brake pads 3, which is an operation target, is integrally formed at the tip of the tubular portion 10. Although not shown, the output member 11 is provided with a guide protrusion that engages with a guide groove formed in the housing 7 along the axial direction of the sun screw shaft 8 on the outer peripheral portion thereof. 8
It is movable only in the axial direction of.
【００１４】前記遊星ねじ軸１２は、外周には前記太陽
ねじ軸８の雄ねじ６に対して逆ねじで、前記雄ねじ６に
転動可能に外接すると共に、前記筒状部１０の雌ねじ１
４に転動可能に内接する雄ねじ１６が形成されている。
各遊星ねじ軸１２は、太陽ねじ軸８と筒状部１０との間
の空間に配備される図３に示すような支持ケース１７に
より、所定の相対位置関係が維持され、かつ回転自在に
支持されている。The planetary screw shaft 12 is a reverse screw on the outer circumference with respect to the male screw 6 of the sun screw shaft 8 so as to be rotatably circumscribed on the male screw 6 and also the female screw 1 of the cylindrical portion 10.
4 is formed with a male screw 16 which is rotatably inscribed.
Each planetary screw shaft 12 is rotatably supported while maintaining a predetermined relative positional relationship by a support case 17 as shown in FIG. 3 arranged in the space between the sun screw shaft 8 and the tubular portion 10. Has been done.
【００１５】以上の構成により、前記太陽ねじ軸８の回
転を、前記遊星ねじ軸１２の太陽ねじ軸８回りの転動及
び太陽ねじ軸８の軸線方向への進退動を介して、前記出
力部材１１の直線運動に変換して、該出力部材１１に連
結された作動対象物であるブレーキパッド３に付与する
が、この一実施形態では、前記太陽ねじ軸８の雄ねじ６
及び出力部材１１の筒状部１０の雌ねじ１４及び前記遊
星ねじ軸１２の雄ねじ１６のそれぞれのねじ相互間の条
数比と有効径比とを適宜値に設定することで、出力部材
１１に所定の直線運動性能を確保するようにしている。With the above construction, the rotation of the sun screw shaft 8 is controlled by the rotation of the planet screw shaft 12 around the sun screw shaft 8 and the forward / backward movement of the sun screw shaft 8 in the axial direction. 11 is converted into a linear motion and is applied to the brake pad 3 which is an operation target connected to the output member 11. In this embodiment, the male screw 6 of the sun screw shaft 8 is applied.
By setting the thread ratio and the effective diameter ratio between the internal thread 14 of the tubular portion 10 of the output member 11 and the external thread 16 of the planetary screw shaft 12 to an appropriate value, the output member 11 has a predetermined value. I try to ensure the linear motion performance of.
【００１６】例えば、太陽ねじ軸８の雄ねじ６における
ねじ条数をＮA，有効径をＤA、筒状部１０の雌ねじ１４
におけるねじ条数をＮB，有効径をＤB、遊星ねじ軸１２
の雄ねじ１６におけるねじ条数をＮC，有効径をＤCとす
る（但し、各ねじ６，１４，１６は、ねじピッチ自体は
同一であるとする）。すると、前記遊星ねじ軸１２の太
陽ねじ軸８に対する軸線方向の相対移動量Ｓ 12は（ＮA
／ＮC−ＤA／ＤC）に比例し、また、出力部材１１の遊
星ねじ軸１２に対する軸線方向の相対移動量Ｓ11は（Ｎ
B／ＮC−ＤB／ＤC）に比例した値となる。For example, in the male screw 6 of the sun screw shaft 8
Number of threads NA， D effective diameterA, The internal thread 14 of the tubular portion 10
The number of screw threads in NB， D effective diameterB, Planetary screw shaft 12
The number of threads in the male thread 16 of NC， D effective diameterCToss
(However, for each screw 6, 14, 16 the screw pitch itself
The same). Then, the thickness of the planetary screw shaft 12
Amount of relative movement S in the axial direction with respect to the positive screw shaft 8 12Is (NA
/ NC-DA/ DC), And the play of the output member 11
Amount of relative movement S in the axial direction with respect to the star screw shaft 1211Is (N
B/ NC-DB/ DC) Is a value proportional to.
【００１７】そこで、互いに接触するねじ間で、相互の
条数比と近似に、相互の有効径比を設定することで、接
触するねじ間の軸線方向の相対移動量を適宜値に微小化
することができ、また、前記太陽ねじ軸８の雄ねじ６に
対して、各ねじ１４，１６を逆ねじにすることで、前記
遊星ねじ軸１２の移動方向と筒状部１０の移動方向とを
互いに逆向きにして、筒状部１０の移動量の一部を遊星
ねじ軸１２の移動によって相殺して、総合的な筒状部１
０の移動量（即ち、太陽ねじ軸８に対する移動量）をよ
り微小化することができ、ブレーキパッド３に対して、
微小な変位量の制御が可能になる。Therefore, by setting mutual effective diameter ratios of the threads that are in contact with each other in a manner close to the mutual thread number ratio, the relative movement amount in the axial direction between the contacting screws is miniaturized to an appropriate value. It is possible to make the moving direction of the planetary screw shaft 12 and the moving direction of the tubular portion 10 mutually by making the respective screws 14 and 16 reverse screws with respect to the male screw 6 of the sun screw shaft 8. In the opposite direction, a part of the movement amount of the tubular portion 10 is offset by the movement of the planetary screw shaft 12, and the overall tubular portion 1
The amount of movement of 0 (that is, the amount of movement with respect to the sun screw shaft 8) can be further reduced, and with respect to the brake pad 3,
It is possible to control a minute amount of displacement.
【００１８】例えば、各ねじ６，１４，１６のねじピッ
チは１．２５ｍｍとし、雄ねじ６は左ねじでＮA＝４，
ＤA＝１５．２ｍｍ、雌ねじ１４は右ねじでＮB＝８，Ｄ
B＝３１．２ｍｍ、雄ねじ１６は右ねじでＮC＝２，ＤC
＝８ｍｍとすると、太陽ねじ軸８を時計方向へ１回転さ
せたとき、遊星ねじ軸１２の太陽ねじ軸８に対する軸線
方向の相対移動量Ｓ12はブレーキパッド３を押し出す方
向（図１で左方）へ約０．２ｍｍとなり、また、出力部
材１１の遊星ねじ軸１２に対する軸線方向の相対移動量
Ｓ11はブレーキパッド３を戻す方向（図１で右方）へ約
０．１ｍｍとなり、結局、出力部材１１の太陽ねじ軸８
に対する直線移動量は、ブレーキパッド３を押し出す方
向に約０．１ｍｍの微小量となる。For example, the screw pitch of each screw 6, 14 and 16 is 1.25 mm, the male screw 6 is a left screw N A = 4.
D A = 15.2 mm, female screw 14 is right-hand screw N B = 8, D
B = 31.2 mm, male thread 16 is right-hand thread N C = 2, D C
= 8 mm, when the sun screw shaft 8 is rotated once clockwise, the relative movement amount S 12 of the planetary screw shaft 12 in the axial direction with respect to the sun screw shaft 8 is the direction in which the brake pad 3 is pushed out (left in FIG. 1). ) Is about 0.2 mm, and the relative amount of movement S 11 of the output member 11 in the axial direction with respect to the planetary screw shaft 12 is about 0.1 mm in the direction in which the brake pad 3 is returned (to the right in FIG. 1). The sun screw shaft 8 of the output member 11
The linear movement amount with respect to is a minute amount of about 0.1 mm in the direction of pushing out the brake pad 3.
【００１９】以上に説明したように、本発明の一実施形
態の直線動アクチュエータ１では、太陽ねじ軸８の回転
を遊星ねじ軸１２を介して出力部材１１の直線運動に変
換するもので、太陽ねじ軸８と出力部材１１との間に介
在する遊星ねじ軸１２と太陽ねじ軸８との接触や遊星ね
じ軸１２と出力部材１１との接触は、いずれも転がり接
触となるため、少ない構成部品数でありながら滑らかな
進退動作を確保することができる。また、各ねじを多条
ねじとすることによってリードを大きくして、進退動作
を迅速化することもできる。As described above, in the linear actuator 1 according to the embodiment of the present invention, the rotation of the sun screw shaft 8 is converted into the linear motion of the output member 11 via the planet screw shaft 12, and Since the contact between the planetary screw shaft 12 and the sun screw shaft 8 and the contact between the planetary screw shaft 12 and the output member 11 which are interposed between the screw shaft 8 and the output member 11 are both rolling contacts, there are few components. Although it is a number, it is possible to ensure a smooth forward / backward movement. Also, by making each screw a multi-start screw, the lead can be made larger and the forward / backward movement can be speeded up.
【００２０】そして、太陽ねじ軸８のねじに対して、遊
星ねじ軸１２および出力部材１１のねじを逆ねじにした
ことで、遊星ねじ軸１２および出力部材１１の直線移動
方向が逆向きになり、それぞれの移動量が相殺されるこ
とによって、出力部である出力部材１１には、微小な変
位量の制御が可能になる。この微小な変位量の制御とい
う点に関しては、それぞれのねじ相互間の条数比と有効
径比とを適宜値に設定することで、さらに最適化するこ
とができる。また、ねじの組み合わせで出力部材１１を
送り出す機構であるため、強大な駆動力を発揮すること
もできる。The planetary screw shaft 12 and the output member 11 are reversely screwed with respect to the sun screw shaft 8 so that the linear movement directions of the planetary screw shaft 12 and the output member 11 are opposite to each other. By offsetting the respective movement amounts, it becomes possible to control the minute displacement amount of the output member 11 which is the output portion. Regarding the control of this minute displacement amount, it can be further optimized by setting the thread ratio and the effective diameter ratio between the respective screws to appropriate values. Further, since the output member 11 is delivered by a combination of screws, it is possible to exert a great driving force.
【００２１】したがって、本発明に係る直線動アクチュ
エータを、例えばディスクブレーキのブレーキパッドの
進退動作用に用いた場合に、ブレーキ装置の小型化や軽
量化に加えて、製造コストの低減を図ることができ、ま
た、高減速比の歯車減速機構とリードの大きいボールね
じ機構とを組み合わせた従来のアクチュエータと比較し
て、構成部品点数が少なく、動力の伝達経路を単純にす
ることができるため、動力の伝達効率の向上にも適す
る。Therefore, when the linear actuator according to the present invention is used, for example, for the forward / backward movement of the brake pad of a disc brake, it is possible to reduce the size and weight of the brake device and to reduce the manufacturing cost. In addition, compared with the conventional actuator that combines a gear reduction mechanism with a high reduction ratio and a ball screw mechanism with a large lead, the number of components is small and the power transmission path can be simplified. It is also suitable for improving the transmission efficiency of.
【００２２】なお、本発明に係る直線動アクチュエータ
の用途は、一実施形態に示したディスクブレーキ用に限
らない。The application of the linear motion actuator according to the present invention is not limited to the disk brake shown in the embodiment.
【００２３】[0023]
【発明の効果】本発明に係る直線動アクチュエータによ
れば、太陽ねじ軸の回転を遊星ねじ軸を介して出力部材
の直線運動に変換するもので、太陽ねじ軸と出力部材と
の間に介在する遊星ねじ軸と太陽ねじ軸との接触や遊星
ねじ軸と出力部材との接触は、いずれも転がり接触とな
るため、少ない構成部品数でありながら滑らかな進退動
作を確保することができる。また、各ねじを多条ねじと
することによってリードを大きくして、進退動作を迅速
化することもできる。そして、太陽ねじ軸のねじに対し
て、遊星ねじ軸および出力部材のねじを逆ねじにしたこ
とで、遊星ねじ軸および出力部材の直線移動方向が逆向
きになり、それぞれの移動量が相殺されることによっ
て、出力部である出力部材には、微小な変位量の制御が
可能になる。この微小な変位量の制御という点に関して
は、それぞれのねじ相互間の条数比と有効径比とを適宜
値に設定することで、さらに最適化することができる。
また、ねじの組み合わせで出力部材を送り出す機構であ
るため、強大な駆動力を発揮することもできる。したが
って、例えばディスクブレーキのブレーキパッドの進退
動作用に用いた場合に、ブレーキ装置の小型化や軽量化
に加えて、製造コストの低減を図ることができ、また、
高減速比の歯車減速機構とリードの大きいボールねじ機
構とを組み合わせた従来のアクチュエータと比較して、
構成部品点数が少なく、動力の伝達経路を単純にするこ
とができるため、動力の伝達効率の向上にも適する。According to the linear motion actuator of the present invention, the rotation of the sun screw shaft is converted into the linear motion of the output member via the planetary screw shaft, and is interposed between the sun screw shaft and the output member. Since the contact between the planetary screw shaft and the sun screw shaft and the contact between the planetary screw shaft and the output member are both rolling contact, it is possible to secure a smooth forward / backward movement with a small number of constituent parts. Also, by making each screw a multi-start screw, the lead can be made larger and the forward / backward movement can be speeded up. Then, by making the planetary screw shaft and the screw of the output member reverse to the screw of the sun screw shaft, the linear movement directions of the planetary screw shaft and the output member become opposite directions, and the respective movement amounts are offset. By doing so, it becomes possible to control a minute displacement amount in the output member that is the output unit. Regarding the control of this minute displacement amount, it can be further optimized by setting the thread ratio and the effective diameter ratio between the respective screws to appropriate values.
Further, since it is a mechanism that sends out the output member with a combination of screws, it is possible to exert a great driving force. Therefore, for example, when it is used for the forward / backward movement of the brake pad of the disc brake, it is possible to reduce the manufacturing cost in addition to reducing the size and weight of the brake device.
Compared with a conventional actuator that combines a gear reduction mechanism with a high reduction ratio and a ball screw mechanism with a large lead,
Since the number of constituent parts is small and the power transmission path can be simplified, it is also suitable for improving power transmission efficiency.
【図１】本発明に係る直線動アクチュエータの一実施形
態の縦断面図である。FIG. 1 is a vertical sectional view of an embodiment of a linear motion actuator according to the present invention.
【図２】図１の直線動アクチュエータを構成するねじ部
材相互の接触状態を示す説明図である。FIG. 2 is an explanatory diagram showing a contact state between screw members constituting the linear motion actuator of FIG.
【図３】図１の直線動アクチュエータに使用されている
遊星ねじ軸を保持するケースの斜視図である。3 is a perspective view of a case holding a planetary screw shaft used in the linear motion actuator of FIG. 1. FIG.
１ 直線動アクチュエータ ２ ディスクブレーキ ３ ブレーキパッド ５ モータ ６ 雄ねじ ７ ハウジング ８ 太陽ねじ軸 １０ 筒状部 １１ 出力部材 １２ 遊星ねじ軸 １４ 雌ねじ １５ 作用部 １６ 雄ねじ １７ 支持ケース 1 Linear Actuator 2 Disc Brake 3 Brake Pad 5 Motor 6 Male Screw 7 Housing 8 Sun Screw Shaft 10 Cylindrical Part 11 Output Member 12 Planetary Screw Shaft 14 Female Screw 15 Working Part 16 Male Screw 17 Support Case
Claims (2)
力する直線動アクチュエータであって、 外周に雄ねじが形成されると共にハウジングに回転自在
に支持されて前記モータによって回転駆動される太陽ね
じ軸と、 前記太陽ねじ軸の周囲を同軸状に囲う筒状部の内周には
前記太陽ねじ軸の雄ねじに対して逆ねじとなる雌ねじが
形成されて、前記太陽ねじ軸の軸線方向にのみ進退可能
に前記ハウジングに支持された出力部材と、 前記太陽ねじ軸と出力部材の筒状部との間の隙間に挿通
され、外周には前記太陽ねじ軸の雄ねじに対して逆ねじ
で、該太陽ねじ軸の雄ねじに転動可能に外接すると共
に、前記出力部材の筒状部の雌ねじに転動可能に内接す
る雄ねじが形成された複数個の遊星ねじ軸とを具備する
構成を成し、 前記太陽ねじ軸の回転を、前記遊星ねじ軸の太陽ねじ軸
回りの転動及び太陽ねじ軸の軸線方向への進退動を介し
て、前記出力部材の直線運動に変換して、該出力部材に
連結される作動対象物に所定の直線運動を付与すること
を特徴とした直線動アクチュエータ。1. A linear motion actuator which converts a rotational force of a motor into a linear motion and outputs the linear motion, wherein a sun screw having an external thread formed on an outer periphery thereof, rotatably supported by a housing, and rotationally driven by the motor. A shaft and a female screw that is a reverse screw to the male screw of the sun screw shaft are formed on the inner circumference of a cylindrical portion that coaxially surrounds the sun screw shaft, and only in the axial direction of the sun screw shaft. An output member supported in the housing so as to be able to move forward and backward, and inserted through a gap between the sun screw shaft and the tubular portion of the output member, and the outer periphery is a reverse screw with respect to the male screw of the sun screw shaft, A plurality of planetary screw shafts, which are circumscribing externally to the male screw of the sun screw shaft and formed with a male screw that is internally rotatably inscribed in the female screw of the tubular portion of the output member, Rotation of the sun screw shaft , Through the rolling of the planetary screw shaft around the sun screw shaft and the forward / backward movement of the sun screw shaft in the axial direction, the linear motion of the output member is converted into an operation target connected to the output member. A linear motion actuator characterized by imparting a predetermined linear motion.
材の筒状部の雌ねじ及び前記遊星ねじ軸の雄ねじのそれ
ぞれのねじ相互間の条数比と有効径比とを適宜値に設定
することで、該出力部材に所定の直線運動性能を確保す
ることを特徴とした請求項１記載の直線動アクチュエー
タ。2. A thread ratio and an effective diameter ratio between the respective threads of the male screw of the sun screw shaft, the female screw of the cylindrical portion of the output member, and the male screw of the planetary screw shaft are set to appropriate values. 2. The linear motion actuator according to claim 1, wherein the output member ensures a predetermined linear motion performance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7237049A JPH0979298A (en) | 1995-09-14 | 1995-09-14 | Linear actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7237049A JPH0979298A (en) | 1995-09-14 | 1995-09-14 | Linear actuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0979298A true JPH0979298A (en) | 1997-03-25 |
Family
ID=17009658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7237049A Pending JPH0979298A (en) | 1995-09-14 | 1995-09-14 | Linear actuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0979298A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019100351A (en) * | 2017-11-28 | 2019-06-24 | 日立オートモティブシステムズ株式会社 | Disc brake |
| JP2020098020A (en) * | 2018-12-19 | 2020-06-25 | 日立オートモティブシステムズ株式会社 | Disc brake |
| CN113531071A (en) * | 2021-07-29 | 2021-10-22 | 陕西国力信息技术有限公司 | Output shaft non-rotating horizontal power transmission mechanism and electric braking device |
-
1995
- 1995-09-14 JP JP7237049A patent/JPH0979298A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019100351A (en) * | 2017-11-28 | 2019-06-24 | 日立オートモティブシステムズ株式会社 | Disc brake |
| JP2020098020A (en) * | 2018-12-19 | 2020-06-25 | 日立オートモティブシステムズ株式会社 | Disc brake |
| CN113531071A (en) * | 2021-07-29 | 2021-10-22 | 陕西国力信息技术有限公司 | Output shaft non-rotating horizontal power transmission mechanism and electric braking device |
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