WO2011078009A1 - Actionneur linéaire électrique - Google Patents

Actionneur linéaire électrique Download PDF

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Publication number
WO2011078009A1
WO2011078009A1 PCT/JP2010/072458 JP2010072458W WO2011078009A1 WO 2011078009 A1 WO2011078009 A1 WO 2011078009A1 JP 2010072458 W JP2010072458 W JP 2010072458W WO 2011078009 A1 WO2011078009 A1 WO 2011078009A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
shaft
nut member
motor
rod shaft
Prior art date
Application number
PCT/JP2010/072458
Other languages
English (en)
Japanese (ja)
Inventor
木本　政志
Original Assignee
Thk株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Thk株式会社 filed Critical Thk株式会社
Publication of WO2011078009A1 publication Critical patent/WO2011078009A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
    • 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
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • 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
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H2025/2031—Actuator casings
    • 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
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H2025/2062—Arrangements for driving the actuator
    • F16H2025/2081—Parallel arrangement of drive motor to screw axis
    • 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
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls

Definitions

  • the present invention relates to an electric linear actuator using a ball screw device.
  • the electric linear actuator includes a housing, a motor attached to the housing, a screw shaft coupled concentrically with the main shaft of the motor, a nut member screwed to the screw shaft, and a parallel to the screw shaft. And a connecting arm fixed to an intermediate portion of the rod shaft and engaged with the nut member.
  • the electric linear actuator employs a two-shaft configuration in which the rod shaft is provided in parallel to the screw shaft, the rod shaft can be moved in the axial direction in addition to the bearing that supports the rotation of the screw shaft. A bearing to support is required. As a result, the number of parts increases, and the housing also increases in size. As a result, the electric linear actuator itself increases in size.
  • the present invention has been made in view of such problems, and an object of the present invention is to provide an electric linear actuator that can meet the demand for miniaturization.
  • an electric linear actuator includes a housing, a motor held in the housing, and a nut member that is axially aligned with the motor and rotatably held with respect to the housing.
  • a rod shaft having a threaded portion with which the nut member is screwed and a cylindrical portion that is provided at both ends of the threaded portion and penetrates the housing; and is supported in the housing and supports the cylindrical portion of the rod shaft.
  • a pair of bearing bushes, a pair of seal members housed in the housing and in sliding contact with the outer peripheral surface of the cylindrical portion of the rod shaft, and a rotation transmission mechanism for transmitting the rotation of the output shaft of the motor to the nut member Have.
  • the rotation of the motor is transmitted to the nut member screwed to the rod shaft, and the rod shaft is moved forward and backward by rotating the nut member. That is, the electric linear actuator of the present invention adopts a uniaxial configuration. For this reason, the housing can be reduced in size, so that the electric linear actuator itself can be reduced in size.
  • FIG. 1 It is a front half sectional view showing an example of an electric linear actuator to which the present invention is applied. It is a perspective view which shows the ball screw apparatus with which the electric linear actuator shown in FIG. 1 is provided. It is a perspective view which shows the extension cover with which the electric linear actuator shown in FIG. 1 is provided.
  • FIG. 1 shows an example of an electric linear actuator (hereinafter referred to as “actuator”) to which the present invention is applied.
  • the actuator 1 includes a housing 2, a motor 3 accommodated in the housing 2, a nut member 4 accommodated in the housing 2 adjacent to the motor 3, and a screw portion 51 into which the nut member 4 is screwed. And a rod shaft 5 formed of cylindrical portions 52 provided at both ends of the screw portion 51, a rotation transmission mechanism 6 for transmitting the rotation of the motor 3 to the nut member 4, and a forward and backward movement of the rod shaft 5 are guided.
  • a pair of bearing bushes 7 and a pair of seal members 8 that are in sliding contact with the outer peripheral surface of the rod shaft 5 are configured.
  • the housing 2 includes an actuator housing 21 in which the motor 3, the nut member 4 and the rotation transmission mechanism 6 are accommodated, and a pair of extension covers 22 in which the bearing bush 7 and the seal member 8 are accommodated.
  • the extension cover 22 is fixed to the outside of the actuator housing 21.
  • the cylindrical portion 52 of the rod shaft 5 passes through the actuator housing 21 and the extension cover 22.
  • the actuator housing 21 is cut by a plane including the rotation center of the motor 3 and the rotation center of the nut member 4, and is composed of a pair of housing halves.
  • a packing member (not shown) is provided between the pair of housing halves, and the water tightness of the actuator housing 21 is ensured.
  • a fixing surface 23 to which the extension cover 22 is fixed is formed.
  • the fixing surface 23 is provided with a fixing bolt mounting hole, and a fixing bolt for fixing the extension cover 22 to the actuator housing 21 is screwed into the fixing bolt mounting hole. The fixing of the extension cover 22 to the actuator housing 21 will be described later.
  • a through hole 24 through which the cylindrical portion 52 of the rod shaft 5 passes is formed in the fixed surface 23, and the inner diameter of the through hole 24 is set larger than the outer diameter of the threaded portion 51 of the rod shaft 5. Has been. Therefore, the forward / backward movement of the rod shaft 5 in the axial direction is not hindered by the through hole 24.
  • a pin member 25 projects from the inner diameter surface of the through hole 24, and this pin member 25 is adapted to engage with a key groove 53 of a columnar portion 52 associated with the rod shaft 5 described later.
  • the motor housing 3 is accommodated in the actuator housing 21 configured as described above, and a drive shaft 31 is directly connected to the motor 3.
  • a drive gear 61 that is rotatably supported with respect to the drive shaft 31 and that constitutes the rotation transmission mechanism 6 is provided. Therefore, when the motor 3 is driven, the rotation of the motor 3 is transmitted to the drive gear 61 via the drive shaft 31, and the drive gear 61 is rotated.
  • FIG. 2 shows the nut member 4 and the rod shaft 5.
  • the nut member 4 is screwed to the rod shaft 5 via a ball, and the rod shaft 5 moves forward and backward in the axial direction according to the rotation direction and the rotation amount of the nut member 4.
  • FIG. 2 the description of the ball existing between the nut member 4 and the rod shaft 5 and the circulation path on which the ball rolls is omitted.
  • the nut member 4 is accommodated in the actuator housing 21 adjacent to the motor 3 and is rotatably held by the actuator housing 21 via a ball bearing 41.
  • the nut member 4 has a through hole through which the rod shaft 5 passes, and is formed in a substantially cylindrical shape.
  • a driven gear 62 constituting the rotation transmission mechanism 6 is fixed to the nut member 4, and a tooth row is formed on the outer peripheral surface of the driven gear 62. The tooth row of the driven gear 62 is engaged with a tooth row of a rotation transmission gear 63 described later.
  • the rod shaft 5 is formed in a substantially cylindrical shape, and includes a threaded portion 51 in which a thread groove for rolling a ball is formed on the outer peripheral surface, and a cylindrical portion 52 provided at both ends across the threaded portion 51. Has been. As shown in FIG. 1, the cylindrical portion 52 penetrates the actuator housing 21 and the extension cover 22 and protrudes outside the extension cover 22. That is, both ends of the rod shaft 5 having this configuration protrude from the housing 2.
  • a long hole-like key groove 53 is formed on the outer diameter surface of the cylindrical portion 52, and a pin member 25 provided in the through hole 24 of the actuator housing 21 is engaged with the key groove 53. It is like that. Further, a blanket 54 constituting a link mechanism is attached to the end of the cylindrical portion 52.
  • the actuator housing 21 accommodates a rotation transmission gear 63 that constitutes the rotation transmission mechanism 6, and this rotation transmission gear 63 includes the drive gear 61 provided in the motor 3 and the above-described rotation gear. It is arranged between the driven gear 62 fixed to the nut member 4.
  • the rotation transmission gear 63 includes a shaft member 63a held by the actuator housing 21 and a gear portion 63b that is rotatably supported around the shaft member 63a.
  • the outer peripheral surface of the gear part 63b is provided with two tooth rows, and one tooth row is configured to mesh with the tooth row of the driven gear 62 fixed to the nut member 4.
  • the other tooth row is configured to mesh with the tooth row of the drive gear 61 provided in the motor 3.
  • the rotation transmission gear 63 configured in this way decelerates the rotation of the drive shaft 31 related to the motor 3 and transmits it to the driven gear 62.
  • FIG. 3 is a perspective view showing the extension cover 22.
  • the extension cover 22 has a receiving hole through which the column portion 52 of the rod shaft 5 passes, and is formed in a substantially cylindrical shape.
  • a flange portion 26 is provided on the outer peripheral surface of the extension cover 22, and a fixing bolt hole is formed in the flange portion 26 so as to communicate with the fixing bolt mounting hole of the actuator housing 21. That is, the extension cover 22 is fixed to the fixing surface 23 of the actuator housing 21 by a fixing bolt and to the outside of the actuator housing 21.
  • a packing member (not shown) is provided between the actuator housing 21 and the extension cover 22 to ensure water tightness of the housing 2.
  • the bearing bush 7 and the seal member 8 are interposed between the receiving hole of the extension cover 22 configured in this way and the outer diameter surface of the cylindrical portion 52 related to the rod shaft 5. ing.
  • the bearing bush 7 is formed in a substantially cylindrical shape, and is fixed to the inner peripheral surface of the receiving hole of the extension cover 22.
  • the inner diameter of the bearing bush 7 is the same as or slightly larger than the outer diameter of the rod shaft 5. The bearing bush 7 thus configured guides the forward and backward movement of the rod shaft 5 relative to the housing 2.
  • the seal member 8 includes a ring portion 81 that is press-fitted into an annular recess 27 provided on the inner peripheral surface of the receiving hole of the extension cover 22, and a seal lip portion 82 that is in sliding contact with the outer peripheral surface of the rod shaft 5. It is composed of The seal member 8 is fixed outside the bearing bush 7 with respect to the moving direction of the rod shaft 5. When the ring member 81 is press-fitted into the recess 27 of the extension cover 22, the seal member 8 configured as described above comes into sliding contact with the outer peripheral surface of the rod shaft 5. Further, the foreign matter adhering to the outer peripheral surface of the rod shaft 5 is removed and the foreign matter is prevented from entering the housing 2.
  • the drive gear 61 rotatably supported on the drive shaft 31 and the rotation transmission meshed with the drive gear 61.
  • the gear 63 rotates in synchronization with the drive shaft 31.
  • the driven gear 62 fixed to the nut member 4 while meshing with the rotation transmission gear 63 also rotates in synchronization with the drive shaft 31.
  • the driven gear 62 when the driven gear 62 is rotated by driving the motor 3, the nut member 4 to which the driven gear 62 is fixed is also rotated. By the rotation of the nut member 4, the nut member 4 is screwed. The rod shaft 5 moves forward and backward in the axial direction.
  • reference numeral 100 in FIG. 1 denotes a plug member for supplying electric power to the motor 3.
  • the rotation transmission of the motor to the nut member is performed by the gear member.
  • a chain, a timing belt, or the like may be used.
  • the rod shaft 5 screwed into the nut member 4 moves forward and backward in the axial direction, that is, Because of the uniaxial configuration, there is no need to house parts that transmit motion between two axes, such as the connecting arm of conventional electric linear actuators, and the nut members and rod shafts are accommodated accordingly. It is possible to reduce the size of the housing. As a result, it is possible to reduce the size of the electric linear actuator itself.
  • the electric linear actuator 1 of the present invention is suitable for use as an electric parking brake device for a vehicle in an environment in which liquid falls on the housing 2.
  • the housing 2 is divided into the actuator housing 21 and the extension cover 22, even if a rod shaft having a long shaft length with respect to the actuator housing 21 is used, It is possible to reliably guide the axial movement of the rod shaft only by adjusting the axial length of the extension cover 22. As a result, even when a rod shaft having a long shaft length is used, it is not necessary to re-mold the housing 2, and an extra production work can be omitted.
  • the pin member 25 and the key groove 53 are provided so that the rod shaft 5 is not rotated by the rotation of the nut member 4, but the object connected to the blanket of the rod shaft 5.
  • the pin member 25 and the key groove 53 need not be provided.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Transmission Devices (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

La présente invention concerne un actionneur linéaire électrique (1) qui peut être miniaturisé. Ledit actionneur linéaire électrique comprend : un boîtier (2) ; un moteur (3) supporté à l'intérieur du boîtier (2) ; un élément formant écrou (4) supporté de manière à pouvoir tourner par rapport au boîtier (2) et faire coïncider les directions axiales avec le moteur (3) ; un arbre (5) qui possède des sections de vis (51) sur lesquelles l'élément formant écrou (4) est vissé, ainsi qu'une section cylindrique (52) qui est située sur les deux extrémités des sections de vis (51) et traverse le boîtier (2) ; deux coussinets de palier (7) qui se trouvent dans le boîtier (2) et supportent la section cylindrique (52) de l'arbre (5) ; deux éléments d'étanchéité (8) qui se trouvent dans le boîtier (2) et qui coulissent contre la surface extérieure de la section cylindrique (52) de l'arbre (5) ; et un mécanisme de transmission de rotation (6) qui transmet la rotation d'un arbre de sortie sur le moteur (3) à l'élément formant écrou susmentionné (4).
PCT/JP2010/072458 2009-12-24 2010-12-14 Actionneur linéaire électrique WO2011078009A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009-292198 2009-12-24
JP2009292198A JP4836215B2 (ja) 2009-12-24 2009-12-24 電動リニアアクチュエータ

Publications (1)

Publication Number Publication Date
WO2011078009A1 true WO2011078009A1 (fr) 2011-06-30

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ID=44195539

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PCT/JP2010/072458 WO2011078009A1 (fr) 2009-12-24 2010-12-14 Actionneur linéaire électrique

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JP (1) JP4836215B2 (fr)
WO (1) WO2011078009A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2520703A (en) * 2013-11-28 2015-06-03 Flowinn Shanghai Ind Co Ltd Linear travel structure of electrical operating device
CN117081301A (zh) * 2023-10-12 2023-11-17 宁波开乐电机有限公司 防水直线驱动系统和实现防水直线驱动的方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013183278A1 (fr) * 2012-06-05 2013-12-12 Thk株式会社 Actionneur
JP6021449B2 (ja) * 2012-06-05 2016-11-09 Thk株式会社 アクチュエータ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62198852U (fr) * 1986-06-04 1987-12-17
JP2008175358A (ja) * 2007-01-22 2008-07-31 Mitsuba Corp 電動アクチュエータ

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0585373A (ja) * 1991-09-30 1993-04-06 Kayaba Ind Co Ltd 電動後輪操舵装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62198852U (fr) * 1986-06-04 1987-12-17
JP2008175358A (ja) * 2007-01-22 2008-07-31 Mitsuba Corp 電動アクチュエータ

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2520703A (en) * 2013-11-28 2015-06-03 Flowinn Shanghai Ind Co Ltd Linear travel structure of electrical operating device
CN117081301A (zh) * 2023-10-12 2023-11-17 宁波开乐电机有限公司 防水直线驱动系统和实现防水直线驱动的方法
CN117081301B (zh) * 2023-10-12 2024-01-09 宁波开乐电机有限公司 防水直线驱动系统和实现防水直线驱动的方法

Also Published As

Publication number Publication date
JP2011133010A (ja) 2011-07-07
JP4836215B2 (ja) 2011-12-14

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