JP2009092216A - Rotation drive device and door driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation drive device in which a sector gear can be downsized, and to provide a door driving device with the same. <P>SOLUTION: In this rotation drive device 1, when output of rotation of a motor is transmitted to a sector gear 5 through an input gear 2 and a drive gear 3a and 3b, the sector gear 5 is rotated around the center O. A forming angle range θ3 of a plurality of gear teeth 50 in the sector angle is smaller than a moving angle range θ2 of the sector gear 5, but is larger than a separating angle range θ1 of the two drive gears 3a and 3b adjacent to each other in the circumferential direction, and the sector gear 5 is therefor rotated, moving to the state of engaging with the only drive gear 3a, the state of engaging with the two drive gears 3a and 3b, and the state of engaging with the only the other drive gear 3b. With this structure, despite the fact that the moving angle range θ2 of the sector gear 5 is large, the forming angle range θ3 of the sector gear 5 can be formed small. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotary drive device having a sector gear and a door drive device in which a door is driven by the rotary drive device.

  In a rotary drive device, a fan gear having a plurality of teeth formed along an arc is often used as a gear that rotates less than one rotation (see Patent Document 1).

When such a sector gear is used, for example, as shown in FIG. 3A, one drive gear 3 is arranged so as to mesh with the sector gear 5A, the drive gear 3 is rotated, and the sector gear is arranged. 5A is driven from the position shown in FIG. 3A to the position shown in FIG. 3C through the position shown in FIG. 3B. 3 is a reference example disclosed by the inventor of the present application in order to explain the present invention.
Japanese Patent Laid-Open No. 06-140494

  In the rotary drive device described with reference to FIG. 3, in order to drive the sector gear 5A from the position shown in FIG. 3 (a) to the position shown in FIG. 3 (c), the sector gear 5A and the drive gear 3 are always in contact. Must be engaged. For this reason, it is necessary to form the teeth 50A in the sector gear 5 over the movement angle range θ20 or more, and there is a problem that the sector gear 5A cannot be reduced in size.

  In view of the above problems, an object of the present invention is to provide a rotary drive device that can reduce the size of a sector gear, and a door drive device including the rotary drive device.

  In order to solve the above-described problem, in the present invention, a rotary drive device having a sector gear having a plurality of teeth formed along an arc and a drive gear that meshes with the sector gear and rotates the sector gear. A plurality of the drive gears are arranged along the rotation trajectory of the teeth, and the angle of formation of the plurality of teeth in the fan gear is a range of movement angles of the fan gears as viewed from the rotation center of the sector gear. It is narrower and wider than the separation angle range of two drive gears adjacent in the circumferential direction in the plurality of drive gears.

  The “fan gear” in the present invention means a gear in which a plurality of teeth are formed only on an arc constituting a part of a perfect circle, and the planar shape does not necessarily have to be a fan shape.

  In the present invention, a plurality of drive gears are arranged, and the formation angle range of the plurality of teeth in the sector gear is narrower than the movement angle range of the sector gear, but is larger than the separation angle range of two adjacent drive gears in the circumferential direction. Since the fan gear is wide, the sector gear is, for example, only meshed with one of the plurality of drive gears, meshed with two drive gears, and only one drive gear different from the one drive gear. Rotate while shifting to the meshed state. For this reason, the tooth formation angle range in the fan gear may be narrower than the range of movement angle of the fan gear, so that the fan gear can be miniaturized and the useless movement space of the fan gear can be reduced. There are effects such as being able to.

  In the present invention, the number of drive gears is preferably two. If the number of the drive gears is two, the input gear for rotationally driving the drive gear can be shared between the two drive gears, and the common input gear is driven as viewed from the rotation center of the sector gear. It can be arranged either radially outside or radially inside the gear.

  In the present invention, it is preferable that an input gear for rotationally driving the plurality of drive gears is disposed radially outward from the plurality of drive gears when viewed from the rotation center of the sector gear. If comprised in this way, since an input gear will be arrange | positioned in the radial direction outer side with long circumference compared with the radial direction inner side, an input gear can be easily arrange | positioned within the movement angle range of a sector gear. .

  In the present invention, the sector gear is preferably arranged with the teeth facing downward. If comprised in this way, there exists an advantage that a foreign material does not adhere easily to the tooth | gear of a sector gear.

  In this invention, it is preferable that the said sector gear is an internal gear which orient | assigns the said tooth | gear inside the said circular arc. If comprised in this way, the radial direction outer side which has a space margin compared with the radial direction inner side of a sector gear can be utilized effectively. For example, a configuration in which the outer peripheral surface side of the sector gear is used as a door, a configuration in which rotation is transmitted to the radially outer side of the sector gear, or the like can be employed.

  The rotary drive device to which the present invention is applied can be applied to, for example, a door drive device. In this case, the sector gear drives a door for adjusting the opening degree of the opening.

  In the present invention, a plurality of drive gears are arranged, and the formation angle range of the plurality of teeth in the sector gear is narrower than the movement angle range of the sector gear, but is larger than the separation angle range of two adjacent drive gears in the circumferential direction. Since the fan gear is wide, the sector gear is, for example, only meshed with one of the plurality of drive gears, meshed with two drive gears, and only one drive gear different from the one drive gear. Rotate while shifting to the meshed state. For this reason, the tooth formation angle range in the fan gear may be narrower than the range of movement angle of the fan gear, so that the fan gear can be miniaturized and the useless movement space of the fan gear can be reduced. There are effects such as being able to.

  Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1]
FIG. 1 is an explanatory diagram of a rotary drive device according to Embodiment 1 of the present invention, and a door drive device as an example of a usage example of the rotary drive device. FIGS. 1 (a), 1 (b), and (c) ) Shows how the sector gear moves.

  A rotational drive device 1 shown in FIG. 1A includes a motor (not shown) as a drive source, an input gear 2 that is rotationally driven by the motor, and two drive gears 3 a and 3 b that mesh with the input gear 2. And the sector gear 5 driven by the two drive gears 3a and 3b. The two drive gears 3 are arranged along the rotation locus of the teeth 50 of the sector gear 5. Therefore, when the rotational output of the motor is transmitted to the sector gear 5 via the input gear 2 and the drive gears 3a and 3b, the sector gear 5 rotates around the center O, as shown in FIG. The position moves from the position shown in FIG. 3B to the position shown in FIG. Moreover, it moves from the position shown in FIG. 3 (c) to the position shown in FIG. 3 (a) through the position shown in FIG. 3 (b).

  Here, the sector gear 5 is an internal gear which directs the tooth | gear 50 to the inner side of a circular arc, and the tooth | gear 50 is arrange | positioned facing down. Accordingly, the two drive gears 3 a and 3 b are disposed radially inward from the teeth 50 of the sector gear 5 when viewed from the rotation center O of the sector gear 5. For the input gear 2, a common gear is used for the two drive gears 3a and 3b. The input gear 2 is disposed radially inward with respect to the two drive gears 3a and 3b and disposed radially outward with respect to the two drive gears 3a and 3b when viewed from the rotational center O of the sector gear 5. Although the configuration can be adopted, the latter configuration is adopted in this embodiment. The sector gear 5 and the input gear 2 are arranged at positions shifted in the rotation axis direction and do not interfere with each other.

  In the rotary drive device 1 configured as described above, the two drive gears 3a and 3b are arranged at a position that forms an angle θ1 (a range of separation angles of the drive gears 3a and 3b) when viewed from the rotation center O of the sector gear 5. . On the other hand, although the sector gear 5 has a movement angle range of θ2, the plurality of teeth 50 are formed over an angle range of the angle θ3 as viewed from the center O (formation angle range of the teeth 50). The range θ3 is smaller than the movement angle range θ2 of the sector gear 5. Still, the formation angle range θ3 of the teeth 50 in the sector gear 5 is slightly larger than the separation angle range θ1 of the two drive gears 3a and 3b.

  For this reason, the sector gear 5 is engaged with only one drive gear 3a of the two drive gears 3a and 3b as shown in FIG. 1A, and as shown in FIG. As shown in FIG. 1 (c), the rotation is made while shifting to the state of meshing with only one drive gear 3b different from the drive gear 3a.

  The rotational drive device 1 of this form is used for the door drive device 10, as shown to Fig.1 (a)-(c), for example. In the example shown here, an opening 12 is formed in the curved wall surface 11, and a door for adjusting the opening degree of the opening 12 is formed on the outer peripheral surface of the sector gear 5 itself. For this reason, when the rotational output of the motor is transmitted to the sector gear 5 via the input gear 2 and the drive gears 3a and 3b, the sector gear 5 opens the opening 12 as shown in FIG. In this state, the door is driven in a state where the opening 12 is half-opened as shown in FIG. 1B and in a state where the opening 12 is fully opened as shown in FIG. The wall surface 11 and the input gear 2 are arranged at positions shifted in the rotation axis direction and do not interfere with each other.

  As described above, in the rotary drive device 1 of this embodiment, the two drive gears 3a and 3b are arranged, and the formation angle range θ3 of the plurality of teeth 50 in the sector gear 5 is the movement angle range θ2 of the sector gear 5. Although it is narrower but wider than the separation angle range θ1 of two drive gears 3a and 3b adjacent in the circumferential direction, the sector gear 5 is engaged with only the drive gear 3a (see FIG. 1A), It rotates while shifting to a state (see FIG. 1B) engaged with the drive gears 3a and 3b (see FIG. 1B) and a state engaged with only another drive gear 3b (see FIG. 1C). For this reason, since the tooth formation angle range θ3 of the sector gear 5 may be narrow for a large movement angle range θ2 of the sector gear 5, the sector gear 5 can be reduced in size, and the sector gear 5 is wasted. Space can be reduced.

  Moreover, in this form, since the sector gear 5 is arrange | positioned with the teeth 50 facing downward, there exists an advantage that a foreign material cannot adhere to the teeth 50 of the sector gear 5 easily.

  Furthermore, in this embodiment, since the number of the drive gears 3a and 3b is two, the input gear 2 for rotationally driving the drive gears 3a and 3b can be shared between the two drive gears 3a and 3b. The drive device 1 can be downsized. Further, when the number of drive gears is three, a common input gear cannot be used. However, in this embodiment, since the number of drive gears 3a and 3b is two, the common input gear 2 is As seen from the rotation center O of the sector gear 5, the drive gears 3a and 3b can be disposed on either the radially outer side or the radially inner side. Here, in this embodiment, the input gear 2 is disposed radially outward from the drive gears 3a and 3b, and such a region has a longer circumference than the inner side. Therefore, the input gear 2 is moved in the movement angle range θ2 of the sector gear 5. Can be easily placed inside.

  Furthermore, since the sector gear 5 is an internal gear, it is possible to effectively utilize the radially outer side having a space margin as compared to the radially inner side of the sector gear 5. Therefore, the door with respect to the opening 12 opened by the curved wall surface 11 can be comprised on the outer peripheral surface side of the sector gear 5. In other words, the rotary drive device 1 including the sector gear 5 can be easily formed inside the door.

[Embodiment 2]
FIG. 2 is an explanatory diagram of a rotary drive device according to Embodiment 2 of the present invention. Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

  A rotational drive device 1 shown in FIG. 2 includes a motor (not shown), an input gear 2 that is rotationally driven by the motor, three drive gears 3a, 3b, and 3c that mesh with the input gear 2, and three drives. It has a sector gear 5 driven by gears 3 a, 3 b, 3 c, and the three drive gears 3 a, 3 b, 3 c are arranged along the rotation locus of the teeth 50 of the sector gear 5. Also in this embodiment, the sector gear 5 is an internal gear that directs the teeth 50 inside the arc, and is arranged with the teeth 50 facing downward.

  In the rotary drive device 1 configured as described above, of the three drive gears 3a, 3b, and 3c, two adjacent drive gears 3a and 3b have an angle θ11 (drive gear 3a, The other two adjacent drive gears 3b and 3c are located at a position forming a separation angle range of 3b) and form an angle θ12 (a separation angle range of the drive gears 3b and 3c) when viewed from the rotation center O of the sector gear 5. Placed in position. On the other hand, although the sector gear 5 has a movement angle range of θ2, the plurality of teeth 50 are formed over an angle range of the angle θ3 as viewed from the center O (formation angle range of the teeth 50). The range θ3 is smaller than the movement angle range θ2 of the sector gear 5.

  Nevertheless, the formation angle range θ3 of the teeth 50 in the sector gear 5 is slightly larger than the arrangement position angles θ11 and θ12 of the two drive gears 3.

  Therefore, the sector gear 5 is engaged with only one drive gear 3a of the three drive gears 3a, 3b, and 3c, is engaged with the two drive gears 3a and 3b, and is provided with another two drive gears 3b. 3c, while rotating to the state engaged with only the drive gear 3c. For this reason, since the formation angle range of the teeth 50 in the sector gear 5 may be narrow for a large movement angle range θ2 of the sector gear 5, the sector gear 5 can be downsized.

[Other embodiments]
In the said Embodiment 1, 2, although the case where there were two drive gears and three was demonstrated, four or more drive gears may be sufficient. In this case, there may be a state where two or more drive gears and the fan gear mesh with each other while the sector gear rotates. In the first embodiment, the drive gears 3a and 3b are directly driven by the common input gear 2. However, a configuration in which the drive gear is directly driven by a plurality of input gears is adopted. Well. Further, the drive gear is driven by a device other than the input gear, for example, the input gear is not directly meshed with the drive gear, but the drive gear is fixed to the rotation center shaft of the drive gear. A configuration may be adopted in which is driven.

  Further, in the first and second embodiments, the sector gear 5 has a sector shape as a whole. However, in members having various shapes, teeth 50 are formed in a part of the arc shape so that the sector gear 5 is The present invention may be applied when configured.

It is explanatory drawing of the door drive device as an example of the rotation drive device which concerns on Embodiment 1 of this invention, and this rotation drive device. It is explanatory drawing of the rotational drive apparatus which concerns on Embodiment 2 of this invention. It is explanatory drawing of the conventional rotational drive apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotation drive apparatus 2 Input gear 3a, 3b, 3c Drive gear 5 Fan-shaped gear 50 Fan-shaped gear tooth

Claims (6)

In a rotary drive device having a sector gear having a plurality of teeth formed along an arc and a drive gear meshing with the sector gear and rotating the sector gear,
A plurality of the drive gears are arranged along the rotation locus of the teeth,
Two drive gears in which the formation angle range of the plurality of teeth in the sector gear is narrower than the movement angle range of the sector gear and is adjacent in the circumferential direction in the plurality of drive gears as viewed from the rotation center of the sector gear. A rotation drive device characterized by being wider than the range of the separation angle.   The rotational drive apparatus according to claim 1, wherein the number of drive gears is two.   The input gear for rotationally driving the plurality of drive gears is disposed radially outward from the plurality of drive gears as viewed from the rotation center of the sector gear. Rotation drive device.   The rotary drive device according to any one of claims 1 to 3, wherein the sector gear is arranged with the teeth facing downward.   The rotary drive device according to any one of claims 1 to 4, wherein the sector gear is an internal gear that directs the teeth toward the inside of the arc. A door drive device comprising the rotation drive device according to any one of claims 1 to 5,
The door gear drives the door for adjusting the opening degree of the opening.

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