JP5350075B2 - Motor unit with reduction gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor device with a reduction gear having the large reduction gear ratio, and having high input-output efficiency. <P>SOLUTION: A gear device 400 provided in the motor device 1 with the reduction gear has a worm gear mechanism 500 and a differential gear mechanism 600. The differential gear mechanism 600 has a first sun gear 602 fixed to a housing 300, first planetary gears 603 and 604 arranging a flat tooth meshing with a flat tooth of the first sun gear 602 on an outer wall surface and rotatably journaled by a worm wheel 502, second planetary gears 607 and 608 sandwiching the worm wheel 502, arranged in a concentric shape to the first planetary gears 603 and 604 on the opposite side to the first planetary gears 603 and 604 and connected to the first planetary gears 603 and 604. and a second sun gear 609 arranging a flat tooth meshing with a flat tooth of the second planetary gears 607 and 608 on an outer peripheral surface and connected with an output part 700. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a motor device with a reduction gear, and more particularly to a motor device with a reduction gear in which a reduction gear is provided with a differential gear mechanism.

  A motor device with a speed reducer is used as an actuator for opening and closing a window glass of an automobile. The motor device with a speed reducer includes an electric motor and a speed reducer. The speed reducer decelerates the rotation of the motor output shaft of the electric motor, and the decelerated rotation is output from an output unit provided in the speed reducer. . And the output part and window glass of a reduction gear are connected by the link or the cable, and a window glass opens and closes by rotation of the output part of a reduction gear.

  Since the window glass is fitted in a state of being pressed onto the window frame via the rubber member, a large frictional force acts between the rubber member and the window glass. In addition, the weight of the window glass is large. Therefore, a large force is required to open and close the window glass, and the output part of the speed reducer is required to rotate with a large rotational torque. Therefore, a reduction gear with a large reduction ratio is used for a motor device with a reduction gear used as an actuator for opening and closing a window glass of an automobile.

  Generally, a worm gear mechanism is used as a reduction mechanism in a reduction gear, and the worm gear mechanism includes a worm provided with spiral teeth on an outer peripheral wall, and a worm wheel provided with external teeth that mesh with worm teeth. (For example, refer to Patent Document 1).

JP 2008-259316 A (Cogging torque)

  However, when the worm gear mechanism is set to have a large reduction ratio, a large sliding frictional force is generated between the screw teeth of the worm and the worm wheel, and the sliding frictional force reduces the speed reduction. A large mechanical loss occurs in the machine. As a result, the input / output efficiency of the motor device with a reduction gear cannot be increased.

  Accordingly, the present invention has been made in view of the circumstances described above, and provides a motor device with a reduction gear having a reduction gear ratio, a reduction gear with a small mechanical loss, and a high input / output efficiency. It is.

In order to solve the above-described problems, a motor device with a reduction gear according to the present invention includes an electric motor having a motor output shaft and an output unit, and decelerates and decelerates rotation of the motor output shaft of the electric motor. A reduction gear that outputs the rotation from the output section, wherein the reduction gear includes a housing to which the electric motor is attached, and a gear device accommodated in the housing, The gear device includes a worm that rotates with rotation of the motor output shaft of the electric motor, a worm gear mechanism that is formed in a disk shape and is rotatably disposed in the housing and meshes with the worm, and is concentric with the worm wheel. a first sun gear fixed to disposed the housing, rotatably supported by the worm wheel And at least two of the connecting shaft are, with the first of the at least two or more first planet gears sun gear meshing via the connecting shaft is rotatably supported by the worm wheel, wherein at least two Ru said first planetary gear and Tei are integrally connected by being concentrically disposed relative to the first planetary gear on the opposite side to said first planetary gear sandwiching the worm wheel the connecting shaft The above- mentioned second planetary gear and the worm wheel are disposed on the opposite side to the first sun gear so as to be rotatable concentrically with the first sun gear and mesh with the second planetary gear. the output unit is closed and the second sun gear are integrally connected, wherein the connecting shaft by the second the first planetary which is connected to the planetary gear when the external force turning the output shaft is applied gear The output shaft and the first sun gear becomes invalid meshing state is characterized by comprising a differential gear mechanism not be rotated by an external force.

  The speed reducer provided in the motor device with a speed reducer of the present invention includes a worm gear mechanism and a differential gear mechanism, and the worm gear mechanism and the differential gear mechanism reduce the rotation of the motor output shaft of the electric motor in two stages. It has become. Therefore, while the worm gear mechanism and the differential gear mechanism increase the reduction ratio, the reduction ratio of the worm gear mechanism is reduced by sharing the reduction ratio between the worm gear mechanism and the differential gear mechanism. In addition, the mechanical loss generated in the worm gear mechanism can be reduced. As a result, it is possible to reduce the mechanical loss that occurs in the speed reducer and increase the input / output efficiency of the motor device with the speed reducer.

It is a perspective view of the motor apparatus with a reduction gear in the embodiment of the present invention. It is an expansion perspective view of a motor device with a reduction gear in an embodiment of the present invention. It is a perspective view of the gear apparatus in the embodiment of the present invention. It is sectional drawing of the gear apparatus shown by the cross section AA in FIG. It is a figure explaining the reduction ratio in the gear apparatus in the embodiment of the present invention.

  Next, an embodiment of the present invention will be described with reference to FIGS. The motor device 1 with a reduction gear according to the present embodiment is used as an actuator for opening and closing a window glass of an automobile. The motor device 1 with a speed reducer includes an electric motor 100 and a speed reducer 200. The electric motor 100 has a motor output shaft (not shown), and the motor output shaft is rotated by electric power supplied to the electric motor 100.

  The speed reducer 200 includes an output unit 700, decelerates the rotation of the motor output shaft of the electric motor 100, and outputs the decelerated rotation from the output unit 700. The reduction gear 200 includes a housing 300 to which the electric motor 100 is attached and a gear device 400 accommodated in the housing 300. In addition, the output part 700 and the window glass of the reduction gear 200 are connected by the link or the cable, and the window glass opens and closes by the rotation of the output part 700 of the reduction gear 200.

  Next, the gear apparatus 400 of this Embodiment is demonstrated based on FIG. 3 and FIG. The gear device 400 includes a worm gear mechanism 500 and a differential gear mechanism 600.

  The worm gear mechanism 500 includes a worm 501 and a worm wheel 502. The worm 501 is formed in a substantially rod shape and is provided with helical screw teeth on the outer peripheral wall. The motor output shaft of the electric motor 100 is connected and rotates with the rotation of the motor output shaft.

  The worm wheel 502 is formed in a disk shape, and a plurality of helical teeth that mesh with the helically-toothed teeth of the worm 501 are provided on the outer peripheral wall, and is disposed in the housing 300 so as to be rotatable. Then, the helically wound teeth of the worm 501 mesh with the helical teeth of the worm wheel 502, and the rotational speed of the motor output shaft is decelerated between the worm 501 and the worm wheel 502. Rotates at a reduced speed.

  The differential gear mechanism 600 of the present embodiment includes two first sun gears 602, two first planetary gears 603 and 604, connecting shafts 605 and 606, and first planetary gears 603 and 604. Second planetary gears 607 and 608 and a second sun gear 609 are provided.

  The first sun gear 602 is formed in a disk shape and has a plurality of spur teeth on the outer peripheral wall, and is integrally disposed on the housing 300 at a position concentric with the worm wheel 502 of the worm gear mechanism 500. It is fixed to the housing 300.

  The first planetary gears 603 and 604 are formed in a disc shape, a plurality of spur teeth are provided on the outer peripheral wall, and rod-shaped connecting shafts 605 and 606 are integrally formed at the center of one end surface. Yes. Then, the connecting shafts 605 and 606 are rotatably supported on the worm wheel 502, so that the first planetary gears 603 and 604 are rotatably supported on the worm wheel 502. The spur teeth provided on the first planetary gears 603 and 604 are meshed with the spur teeth provided on the first sun gear 602.

  Thus, since the first planetary gears 603 and 604 are rotatably supported by the worm wheel 502, the first planetary gears 603 and 604 have the same rotational speed as that of the worm wheel 502 described above. Revolves around one sun gear 602. Since the spur teeth of the first planetary gears 603 and 604 are meshed with the spur teeth of the first sun gear 602, they rotate in the same rotational direction as the revolving motion together with the revolving motion.

  The second planetary gears 607 and 608 are formed in a disk shape, and a plurality of spur teeth are provided on the outer peripheral wall. The worm wheel 502 is sandwiched between the first planetary gears 603 and 604, on the opposite side of the first planetary gears 603 and 604, and concentrically with respect to the first planetary gears 603 and 604. The planetary gears 603 and 604 are integrally connected.

  As described above, the second planetary gears 607 and 608 are integrally connected to the first planetary gears 603 and 604 by the connecting shafts 605 and 606, so that the second planetary gears 607 and 608 are connected to the first planetary gears 607 and 608. The planetary gears 603 and 604 rotate integrally with each other, and perform revolutions and rotations at the same rotational speed as the first planetary gears 603 and 604.

  The second sun gear 609 is formed in a disk shape, and a plurality of spur teeth are provided on the outer peripheral wall. The worm wheel 502 is sandwiched between the first sun gear 602 and the first sun gear 602. The spur teeth of the second sun gear 609 are arranged concentrically with the first sun gear 602. The second planetary gears 607 and 608 are meshed with the spur teeth.

  Thus, the second sun gear 609 is engaged with the spur teeth of the second sun gear 609 and the spur teeth of the second planetary gears 607 and 608 that revolve and rotate as described above. The second planetary gears 607 and 608 are rotated by the revolution and rotation of the planetary gears 607 and 608. The output unit 700 of the speed reducer 200 is integrally connected to the second sun gear 609, and the main power unit 700 rotates together with the second sun gear 609.

  Next, based on FIG. 5, the reduction ratio Zr of the gear device 400 of the present embodiment will be described separately for the reduction ratio Zur of the worm gear mechanism 500 and the reduction ratio Zsr of the differential gear mechanism 600.

Regarding the reduction ratio Zur of the worm gear mechanism 500, when the number of feed teeth of the worm 501 when the worm 501 rotates once is "Zu1" and the number of teeth of the worm wheel 502 is "Zu2", the reduction ratio Zur is “Zur = Zu2 / Zu1”. At this time, if the rotation speed of the worm 501 rotating together with the motor output shaft is “Nin”, the rotation speed of the worm wheel 502 is “N1 = Nin / Zur”.

  Regarding the reduction gear ratio Zsr of the differential gear mechanism 600, the number of teeth of the first sun gear 602 is “Zs1”, the number of teeth of the first planetary gears 603 and 604 is “Zs2”, and the second planetary gears 607 and 608 When the number of teeth is “Zs3” and the number of teeth of the second sun gear 609 is “Zs4”, the reduction ratio Zsr is “Zsr = (Zs2 × Zs4) / (Zs2 × Zs4−Zs1 × Zs3)”. Become. At this time, as described above, when the worm wheel 502 rotates at the rotation speed N1 and the first planetary gears 603 and 604 revolve at the rotation speed N1, the second sun gear in which the output unit 700 is integrally formed. The rotational speed of 609 is “Nout = N1 / Zsr”.

  The product of the reduction ratio Zur of the worm gear mechanism 500 and the reduction ratio Zsr of the differential gear mechanism 600 indicates the reduction ratio Zr of the gear device 400, and the reduction ratio Zr is “Zr = Zur × Zsr”. The rotation speed Nin of the motor output shaft is decelerated to a rotation speed Nout (Nout = Nin / Zr) divided by the reduction ratio Zr, and the output unit 700 rotates at the reduced rotation speed Nout. Further, the rotational torque of the motor output unit is increased to a value corresponding to the reduction ratio Zr, and this increased rotational torque becomes the rotational torque of the output unit 700.

  Next, the effect which the motor apparatus 1 with a reduction gear of this Embodiment has is demonstrated. The reduction gear 200 provided in the motor device 1 with a reduction gear according to the present embodiment includes a worm gear mechanism 500 and a differential gear mechanism 600. The worm gear mechanism 500 and the differential gear mechanism 600 are used to control the motor output shaft of the electric motor 100. The rotation is decelerated in two stages. Therefore, the reduction ratio of the entire reduction gear 200 can be increased by both the worm gear mechanism 500 and the differential gear mechanism 600.

  The reduction ratio of the worm gear mechanism 500 is divided into two stages by the worm gear mechanism 500 and the differential gear mechanism 600 with less mechanical loss due to force transmission by the spur teeth, so that the reduction ratio of the worm gear mechanism 500 is divided into two stages. The mechanical loss generated in the worm gear mechanism can be reduced. As a result, the mechanical loss generated in the speed reducer 200 can be reduced, and the input / output efficiency of the motor apparatus 1 with the speed reducer can be increased.

  For example, when an external force is applied to a window glass of an automobile that is opened and closed by the motor apparatus 1 with a speed reducer by a person who illegally enters from outside the vehicle, the motor apparatus 1 with a speed reducer connected to the window glass by a link or the like. The output unit 700 tends to be rotated by an external force acting on the window glass. When such an external force acts on the output unit 700, the external force is a second sun gear 609 in which the output unit 700 is integrally formed, and second planetary gears 607 and 608 that are meshed with the second sun gear 609. Are transmitted to the first planetary gears 603 and 604 in order via the connecting shafts 605 and 606, and the first planetary gears 603 and 604 try to revolve around the first sun gear 602.

As described above, when the external force acting on the output unit 700 is transmitted to the first planetary gears 603 and 604, the second sun gear 609 is rotated by the external force, and is brought into contact with the second sun gear. The two second planetary gears 607 and 608 escape radially outward. At that time, the connecting shafts 605 and 606 are slightly inclined due to a backlash caused by a gap that normally exists between the worm wheel 502 and the two connecting shafts 605 and 606. The axial distance between the two first planetary gears 603 and 604 supported by the worm wheel 502 and the first sun gear 602 is changed by a slight inclination of the connecting shafts 605 and 606. Due to the change in the axial distance, the two first planetary gears 603 and 604 and the first sun gear 602 are in an improper meshing state.

The first sun gear 602 is integrally fixed to the housing 300, and the first planetary gears 603 and 604 that are improperly engaged with the first sun gear 602 revolve around the first sun gear 602. Can not do it. Therefore, the output unit 700 connected to the first planetary gears 603 and 604 is not rotated by an external force, and the motor device 1 with a speed reducer has a so-called reverse rotation prevention function without separately providing a brake means inside. It will be.

DESCRIPTION OF SYMBOLS 1 Motor device 100 with reduction gear Electric motor 200 Reduction gear 300 Housing 301 Cover body 400 Gear device 500 Worm gear mechanism 501 Worm 502 Worm wheel 600 Differential gear mechanism 601 Center pole 602 First sun gear 603, 604 First planetary gear 605, 606 Connecting shaft 607, 608 Second planetary gear 609 Second sun gear 700 Output section

Claims (3)

An electric motor having a motor output shaft;
In a motor device with a speed reducer, comprising: an output unit; and a speed reducer that decelerates rotation of the motor output shaft of the electric motor and outputs the decelerated rotation from the output unit.
The speed reducer includes a housing to which the electric motor is attached, and a gear device housed in the housing.
The gear device is
A worm gear mechanism having a worm that rotates with rotation of the motor output shaft of the electric motor, and a worm wheel that is formed in a disk shape and is rotatably arranged in the housing and meshes with the worm;
A first sun gear arranged concentrically with the worm wheel and fixed to the housing ; at least two or more connecting shafts rotatably supported by the worm wheel; and the first sun gear At least two or more first planetary gears meshed with the gears and rotatably supported by the worm wheel via the connecting shaft, and on the opposite side to the first planetary gears across the worm wheel. at least two or more second planet gears Ru said first Tei is a planetary gear and integrally connected by arranged the connecting shaft concentrically with respect to the first planetary gear, the first sandwiching the worm wheel second thick that the output unit is rotatably disposed on the first sun gear and concentrically opposite meshing with the second planetary gears are integrally connected to the sun gear As well as organic and a wheel, said being connected to said second planetary gear by the coupling shaft first planetary gear and said first sun gear becomes invalid meshing output when an external force turning the output shaft is applied A motor device with a speed reducer, comprising: a differential gear mechanism whose shaft is not rotated by an external force .   The motor device with a reduction gear according to claim 1, wherein the second planetary gear rotates integrally with the first planetary gear.   The first and second planetary gears and the first and second sun gears are each formed in a disk shape, and a plurality of spur teeth are provided on an outer peripheral wall. The motor apparatus with a reduction gear of description.

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