JP2006275152A - Electric actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manually operate an output arm by using a fixing time separating mechanism, when jamming is caused in any of a plurality of speed reduction gear parts. <P>SOLUTION: This electric actuator is constituted so that a plurality of stages of speed reduction gear parts 7, 8 and 9 are arranged in a housing 1 having a motor 2, and the fixing time separating mechanism 50 capable of interlocking with the speed reduction gear parts 7, 8 and 9 is arranged outside the housing 1, and when the jamming is caused in any of the respective speed reduction gear parts 7, 8 and 9, the output arm 30 can be manually rotated by putting the speed reduction gear part 9 of the final stage in a free state by the fixing time separating mechanism 50. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric actuator, and in particular, even when a speed reducer using a planetary gear is stuck and stopped due to jamming (fixing) or the like, the separation mechanism at the time of fixing is used for the final stage nth reduction gear portion. The present invention relates to a novel improvement for releasing the restriction of the n-th internal gear so that the output arm can be manually rotated together with the n-th internal gear and the n-th reduction gear portion.

Conventionally, as this type of electric actuator, which has been used, a patent document name or the like is not specifically disclosed, but the configuration shown in FIG. 10 has been adopted.
That is, what is indicated by reference numeral 1 in FIG. 10 is a housing. A motor 2 is provided on one end 1a side of the housing 1, and the first, second and nth internal gears are provided on the inner wall of the housing 1. 3, 4, and 5 are provided.

  Inside each of the internal gears 3, 4, 5, well-known first, second, and nth reduction gear parts 7, 8, 9 using a plurality of planetary gears 6 are provided, and the reduction gear parts 7, First, second, and n-th output shaft bodies 10, 11, and 12 having the planetary gears 6 at 8 and 9 rotatably supported are provided.

  Each planetary gear 6 of each of the reduction gear portions 7, 8, 9 meshes with each of the internal gears 3, 4, 5 to form a planetary gear type three-stage reduction type reduction gear 20. ing.

The rotating shaft 2a of the motor 2 is inserted into the center of the first reduction gear portion 7 and meshed with and connected to the planetary gears 6.
Each of the reduction gear portions 7, 8, and 9 is provided with first, second, and n-th output shaft bodies 10, 11, and 12 that rotatably support the planetary gears 6 respectively. The first output shaft body 10 is inserted into the center of the second reduction gear portion 8 and meshes with each planetary gear 6, and the second output shaft body 11 is inserted into the center of the nth reduction gear portion 9. The first output arm 30 is engaged with each planetary gear 6 and is configured to reciprocate and rotate by a predetermined finite angle to the nth output shaft body 12.

  The planetary gears of the reduction gear portions 7, 8, 9 mesh with the first, second, and nth internal gears 3, 4, 5 provided corresponding to the reduction gear portions 7, 8, 9, respectively. As a result, the reduction gear portions 7, 8, 9 having three planetary gears 6 are configured.

  Therefore, in the above-described configuration, when the rotation shaft 2a of the motor 2 is rotated, the rotation of the rotation shaft 2a is transmitted through the reduction gear 20 including the first, second, and nth reduction gear portions 7, 8, and 9. After being decelerated, the first output arm 30 is transmitted to the first output arm 30, and the first output arm 30 can reciprocate at a finite angle with a predetermined reduction ratio.

  In FIG. 10, the configuration of one motor 2, the speed reducer 20, and the first output arm 30 is shown, the illustration of the symmetrical side is omitted, and only the first output arm is rotated only on the one side described above. For example, the motor 2 or the like may be disposed symmetrically and the first and second output arms 30 and 31 may be configured to rotate.

Since the conventional electric actuator is configured as described above, the following problems exist.
That is, when a driven body such as an airplane flap is connected to each output arm and driven to reduce speed via a speed reducer, a jamming phenomenon occurs in any of the speed reduction gears of the speed reducer, causing the speed reduction. When the aircraft stops functioning, the output arm cannot be manually rotated, which can cause serious troubles in airplanes and other devices, for example.

  An electric actuator according to the present invention includes a motor provided in a housing and a plurality of first to nth reduction gears connected in series, each of which includes a planetary gear provided in the housing for reducing the rotation of the rotation shaft of the motor. And a first output arm connected to the n-th output shaft body of the final-stage n-th reduction gear portion of the reduction gear portions provided in the housing, and by the motor In the electric actuator configured to rotate the first output arm in a decelerated state, the first output arm has a fixing release mechanism provided outside the housing, and the fixing release mechanism is a member of the reduction gear unit. A first rotating gear shaft that rotates in conjunction with the first reduction gear portion in the first stage, a second rotating gear shaft that rotates in conjunction with the first rotating gear shaft, and the second rotating gear shaft that rotates in conjunction with the first rotating gear shaft A ring body coaxially arranged with the housing on the outer periphery of the housing, and a plurality of recesses formed at predetermined intervals on the inner surface of the ring body, and the nth reduction gear portion of the nth reduction gear portion is in the through hole of the housing. n When a ball that engages with the internal gear is provided and rotation of the reduction gears other than the first reduction gear unit is stopped, the motor causes the motor to pass through the first reduction gear unit and the rotation gear shafts. The ring body is rotated so that the ball escapes into the recess, and the first output arm can be rotated together with the nth internal gear and the nth reduction gear portion without using the motor. Further, the first internal gear rotatably provided at the outer peripheral position of the first reduction gear portion is configured to be restricted in rotation by a coil spring provided in the housing, and The first to nth reduction gear portions have a first to an nth output shaft body having three planetary gears, and the first to nth reduction gear portions have a three-stage configuration. In addition, the housing, the motor, the speed reducer, the detachment mechanism at the time of fixation, and each output arm are provided in a pair in a left and right target arrangement, and each output arm is adjacent to the inner position of each housing. In addition, when the rotation stop state occurs, the motor is driven at the maximum torque that reaches the rating of the motor.

Since the electric actuator according to the present invention is configured as described above, the following effects can be obtained.
That is, since a mechanism for separating at the time of fixing is provided on the outer side of the housing of the speed reducer so that the speed reduction gear can be rotated when jamming (fixing) occurs, the motor is further driven. Thus, the output arm can be manually rotated by the action of the separating mechanism at the time of fixation, and the inoperability can be released.

  In the present invention, even when a reduction gear using a planetary gear is stuck and stopped due to jamming or the like, the restriction on the n-th internal gear of the n-th reduction gear portion at the final stage is released using the separation mechanism at the time of fixation. An object of the present invention is to provide an electric actuator capable of manually rotating an output arm together with an nth internal gear and an nth reduction gear unit.

Hereinafter, preferred embodiments of an electric actuator according to the present invention will be described with reference to the drawings.
In addition, the same code | symbol is attached | subjected and demonstrated to a part the same as that of a prior art example, or an equivalent part.
4 is a cylindrical housing as shown in FIG. 3, and a motor 2 is provided on one end 1 a side of the housing 1. 2, n-th internal gears 3, 4 and 5 are provided.

  Inside each of the internal gears 3, 4, 5, well-known first, second, and nth reduction gear parts 7, 8, 9 using a plurality of planetary gears 6 are provided, and the reduction gear parts 7, First, second, and n-th output shaft bodies 10, 11, and 12 having the planetary gears 6 at 8 and 9 rotatably supported are provided.

  Each planetary gear 6 of each of the reduction gear portions 7, 8, 9 meshes with each of the internal gears 3, 4, 5 to form a planetary gear type three-stage reduction type reduction gear 20. ing. It should be noted that the number of stages is not limited to three, and may be three or more.

The rotating shaft 2a of the motor 2 is inserted into the center of the first reduction gear portion 7 and meshed with and connected to the planetary gears 6.
As described above, the first, second and nth output shaft bodies 10, 11 and 12 each having the planetary gears 6 are rotatably supported in the reduction gear portions 7, 8, and 9 as described above. The first output shaft body 10 is inserted into the center of the second reduction gear portion 8 and meshes with each planetary gear 6, and the second output shaft body 11 is connected to the nth reduction gear portion 9. The first output arm 30 is connected to the n-th output shaft body 12 so as to reciprocate by a predetermined finite angle.

  The planetary gears 6 of the reduction gear portions 7, 8, 9 are respectively connected to first, second and n-th internal gears 3, 4, 5 provided corresponding to the reduction gear portions 7, 8, 9 respectively. By the meshing, the reduction gear portions 7, 8, 9 having the three planetary gears 6 are configured.

  A coil spring 41 is provided in the holding hole 40 formed in the wall of the housing 1, and the inner end of the coil spring 41 is in contact with the outer peripheral surface of the first internal gear 3 and is in a biased state. The first internal gear 3 is held in a state of being temporarily fixed to the housing 1 by the frictional force of the coil spring 41.

  The second internal gear 4 is fixed in a state of being fitted to the inner wall of the housing 1, and the n-th internal gear 5 is a steel ball held in a through hole 42 formed in the housing 1. A part of the ball 43 is temporarily engaged with the housing 1 by engaging with a locking recess 44 formed on the outer peripheral surface of the n-th internal gear 5.

  A ring body 45 is provided on the outer peripheral surface of the housing 1 so as to be coaxial with the housing 1 and to be rotatable. The ring body 45 is configured to constitute a part of a fixing mechanism 50 described later. In addition, as shown in FIG. 5, a plurality of concave portions 46 sized to allow the balls 43 to escape are disposed on the inner surface of the ring body 45 at predetermined angular intervals.

  The separation mechanism 50 at the time of fixing includes a first rotation gear shaft 60 that rotates in conjunction with the first internal gear 3 of the first reduction gear portion 7 of the first stage among the reduction gear portions 7, 8, 9, and the first rotation gear shaft 60. A second rotating gear shaft 61 that rotates in conjunction with the rotating gear shaft 60; the ring body 45 that rotates in conjunction with the second rotating gear shaft 61 and is arranged coaxially with the housing 1 on the outer periphery of the housing 1; And a plurality of the concave portions 46 formed in 45.

  The above-described electric actuator 100 shown in FIG. 4 is mainly shown as one as shown on the left side, and even one can be used, but as shown in FIGS. 1 and 2, a pair of electric actuators are used. 100 is a symmetrical arrangement, and a pair of output arms 30 and 31 are arranged adjacent to each other, so that a pair of driven bodies (not shown) can be driven separately or simultaneously. Yes.

Next, the operation when the pair of electric actuators 100 according to the present invention configured as described above are arranged symmetrically in series will be described.
1 to 5 show normal operation, and each motor 2 and speed reducer 20 is used to reciprocate each output arm 30 and 31 separately or simultaneously within the angular range of finite angle θ shown in FIG. It can be rotated.

Next, in FIGS. 6 and 7, jamming occurs in the speed reducer 20 (the two subsequent stages of the reduction gear parts 7, 8, 9 are fixed), and the second and nth reduction gear parts 8, 9 Shows a configuration in which is in a stopped state.
The above-described state is detected by a jamming sensor (not shown), and when a jamming detection signal is input to a motor control circuit (not shown), the motor 2 has the maximum motor current or voltage, that is, the maximum output torque. , The first internal gear 3 rotates overcoming the friction torque of the coil spring 41 via the first reduction gear portion 7, and the ring body 45 rotates via the rotary gear shafts 60 and 61.

By the rotation of the ring body 45, as shown in FIG. 7, the recesses 46 for escape and the corresponding positions of the balls 43 come close to each other.
The state shown in FIG. 8 and FIG. 9 shows a state in which the ball 43 and the recess 46 coincide with each other, the ball 43 fits into the recess 46 and escapes, and the separation mechanism 50 is separated at the time of fixing. In this state, the locked state between the locking recess 44 of the nth internal gear 5 and the ball 43 is released, and the nth internal gear 5 becomes rotatable. Note that the ball 43 is normally configured not to return to its original state once it enters the recess 46.

  When the output arm 30 is manually rotated in the above-described state, the nth reduction gear portion 9 and the nth internal gear 5 rotate in conjunction with the output arm 30, so that the output arm 30 is manually rotated. It is possible to move the output arm 30 when jamming occurs, and to manually operate a driven body (not shown) such as a flap in the event of an emergency, thereby preventing an accident or the like. Can do.

  The present invention is not limited to an electric actuator, and can be applied to, for example, a toy.

It is sectional drawing which shows the electric actuator by this invention. It is a top view of FIG. It is a side view of FIG. It is an expanded sectional view which shows the principal part of FIG. It is XX expanded sectional drawing of FIG. FIG. 5 is a cross-sectional configuration diagram illustrating when jamming occurs in FIG. 4. It is XX expanded sectional drawing of FIG. FIG. 7 is a cross-sectional configuration diagram illustrating a state where the decoupling mechanism of FIG. 6 is operated to complete the decoupling of the reduction gear unit. It is XX expanded sectional drawing of FIG. It is sectional drawing of the principal part which shows the conventional electric actuator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Motor 3 1st internal gear 4 2nd internal gear 5 n n internal gear 6 Planetary gear 7 1st reduction gear part 8 2nd reduction gear part 9 nth reduction gear part 10 1st output shaft body 11 2nd output Shaft body 12 n-th output shaft body 20 Reduction gears 30, 31 First and second output arms 40 Holding hole 41 Coil spring 42 Through-hole 43 Ball 44 Locking recess 45 Ring body 50 Detaching mechanism 60 when fixed First rotating gear shaft 61 Second Rotating Gear Shaft 46 Concave 100 Electric Actuator

Claims (6)

A series connection comprising a motor (2) provided in the housing (1) and a planetary gear (6) provided in the housing (1) for reducing the rotation of the rotating shaft (2a) of the motor (2). A reduction gear (20) comprising a plurality of first to n-th reduction gear portions (7, 8, 9), and each of the reduction gear portions (7, 8, 9) provided in the housing (1) A first output arm (30) connected to the nth output shaft body (12) of the nth reduction gear portion (9) of the final stage of the first output arm (30) by the motor (2) In the electric actuator that is made to rotate in a decelerated state,
There is an adhering separation mechanism (50) provided outside the housing (1), and the adhering separation mechanism (50) is the first stage of each of the reduction gear portions (7, 8, 9). A first rotating gear shaft (60) that rotates in conjunction with a reduction gear portion (7), a second rotating gear shaft (61) that rotates in conjunction with the first rotating gear shaft (60), and the second rotating gear shaft (61) and a ring body (45) coaxially arranged with the housing (1) on the outer periphery of the housing (1), and a plurality of recesses formed on the inner surface of the ring body (45) at predetermined intervals. The ball (43) that engages with the nth internal gear (5) of the nth reduction gear portion (9) is provided in the through hole (42) of the housing (1),
When the rotation of the reduction gear portions (7, 8, 9) other than the first reduction gear portion (7) is stopped, the motor (2) causes the first reduction gear portion (7) and the rotations to be stopped. The ring body (45) is rotated via the gear shaft (60, 61), the ball (43) escapes into the recess (46), and the first output arm (30) causes the motor (2) to move. An electric actuator characterized in that it can be rotated together with the nth internal gear (5) and the nth reduction gear portion (9) without being used.   The rotation of the first internal gear (3) provided rotatably at the outer peripheral position of the first reduction gear portion (7) is restricted by a coil spring (41) provided on the housing (1). The electric actuator according to claim 1.   The first to nth reduction gear portions (7, 8, 9) have first to nth output shaft bodies (10, 11, 12) having three planetary gears (6). The electric actuator according to claim 1 or 2.   The electric actuator according to any one of claims 1 to 3, wherein the first to nth reduction gear portions (7, 8, 9) have a three-stage configuration.   The housing (1), the motor (2), the speed reducer (20), the detachment mechanism (50) when fixed, and the output arms (30, 31) are provided as a pair in a left-right target arrangement, and the output arms The electric actuator according to any one of claims 1 to 4, wherein (30, 31) are provided adjacent to each other at an inner position of each housing (1).   The electric actuator according to any one of claims 1 to 5, wherein when the rotation stop state occurs, the motor (2) is driven with a maximum torque reaching a rating of the motor (2).

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