JP2018165558A - Gear mechanism and motor unit having the gear mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear mechanism that is made small.SOLUTION: In a motor unit 20, a distance between a first rotation shaft 32c that is a rotation shaft of a first gear 32 and a second rotation shaft 34c that is a rotation shaft of a second gear 34 is equal to a distance between the second rotation shaft 34c and a third rotation shaft 36b that is a rotation shaft of a third gear 36, and the first rotation shaft 32c and the third rotation shaft 36b are positioned coaxially. Therefore, compared to a case in which the first rotation shaft 32c and the third rotation shaft 36b are not coaxially positioned, a space can be saved without reducing transmission efficiency of power, or increasing labors in manufacturing a gear mechanism.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gear mechanism and a motor unit having the gear mechanism.

  Conventionally, when using a motor as power, a gear mechanism is known that reduces the rotational speed or changes the torque by combining a plurality of gears. For example, Patent Document 1 discloses that first and second shafts arranged in parallel to each other, a drive gear provided so that the first shaft can rotate together, and a second shaft that can rotate together. A first intermediate gear that is provided and meshes with the drive gear, and first and second nuts that can be self-locked and screwed to the threaded portion of the bearing to fix the inner ring of the bearing to the first and second shafts. A reduction gear as a parallel shaft gear mechanism and a method of manufacturing the reduction gear are described.

JP 2009-222185 A

  However, the speed reducer described in Patent Document 1 has a problem that the plane size is large because a plurality of gears are arranged on a plane.

  The present invention has been made in view of such problems, and a main object of the present invention is to provide a gear mechanism that is further downsized. Another object of the present invention is to provide a motor unit provided with this gear mechanism.

  The present invention adopts the following means in order to achieve at least one of the above-mentioned main objects.

The gear mechanism of the present invention is
A gear mechanism in which a plurality of gears are arranged at positions where respective rotation axes are parallel,
A first gear having a first tooth portion and a second tooth portion and rotating about the first rotation shaft;
A second gear having a third tooth portion and a fourth tooth portion meshing with the second tooth portion, and rotating around a second rotating shaft;
A third gear having a fifth tooth portion meshing with the fourth tooth portion and rotating around the third rotation shaft;
With
The distance between the first rotating shaft and the second rotating shaft is equal to the distance between the second rotating shaft and the third rotating shaft,
The inter-axis angle, which is an angle formed by a straight line extending from the second rotation axis to the first rotation axis and a straight line extending from the second rotation axis to the third rotation axis, is 0 ° or more and less than 180 °. Characterized by the
Is.

  In this gear mechanism, the distance between the first rotating shaft and the second rotating shaft is equal to the distance between the second rotating shaft and the third rotating shaft, and a straight line extending from the second rotating shaft to the first rotating shaft. Between the second rotation axis and the straight line extending from the second rotation axis to the third rotation axis is an angle between 0 ° and less than 180 °, so that the first rotation axis, the second rotation axis, and the third rotation axis are straight lines. Compared to the case where the first gear, the second gear, and the third gear are arranged at the upper position, the transmission efficiency is reduced, and the space is saved without increasing the labor for manufacturing the gear mechanism. Can be

  In the gear mechanism of the present invention, the inter-axis angle may be 0 ° or more and less than 90 °. By doing so, the transmission efficiency can be further reduced compared to the case where the first gear, the second gear, and the third gear are disposed at a position where the inter-shaft angle is 90 ° or more and less than 180 °. Space can be saved without increasing labor during manufacturing.

  In the gear mechanism of the present invention, the first rotating shaft and the third rotating shaft may be located on the same axis. As a result, the transmission efficiency is further reduced compared to the case where the first gear, the second gear, and the third gear are arranged at a position where the inter-shaft angle is 0 ° or more and less than 90 °. Space can be saved without increasing labor during manufacturing.

  The gear mechanism of the present invention comprises a bearing member having a first bearing portion that fixes one of the first rotating shafts and a second bearing portion that fixes one of the third rotating shafts. It may be a feature. In this way, one of the first rotating shaft and one of the second rotating shaft can be fixed by one member, so that the number of parts can be reduced as compared to the case where each is fixed by another member. Thus, labor during the production of the gear mechanism can be reduced.

  In the gear mechanism of the present invention adopting this aspect, the bearing member further includes a through-hole penetrating from the side where the first bearing portion is provided to the side where the second bearing portion is provided. It may be a feature. If it carries out like this, the rotational force of the 1st gear arrange | positioned at the side in which the 1st bearing part is provided will be applied to the 3rd gear arrange | positioned in the side in which the 2nd bearing part which is the other side of a bearing member is provided. Can communicate.

  In the gear mechanism of the present invention, the first gear and the second gear may be external gears, and the third gear may be an internal gear. By doing so, compared with the case where the third gear is an external gear, it is possible to further reduce the space without reducing the transmission efficiency or increasing the labor at the time of manufacturing the gear mechanism. .

The motor unit of the present invention is
Any of the gear mechanisms described above;
A motor for rotating a gear meshing with the first tooth portion;
Characterized by comprising
Is.

  Since this motor unit has the same configuration as the gear mechanism described above, the same effects as the gear mechanism described above, for example, the first rotary shaft, the second rotary shaft, and the third rotary shaft are positioned on a straight line. Compared with the case where it carries out, the effect that transmission efficiency can be saved without reducing transmission efficiency or increasing the effort at the time of manufacture of a gear mechanism can be acquired.

FIG. 1 is an exploded perspective view schematically showing the configuration of the motor unit 20. FIG. 2 is a side view illustrating the outline of the configuration of the motor unit 20. FIG. 3 is a cross-sectional view showing an AA cross section of the motor unit 20. FIG. 4 is a side view illustrating the outline of the configuration of another embodiment of the motor unit 20.

  Next, the motor unit 20 according to the embodiment of the present invention will be described in detail with reference to FIGS. The embodiments and drawings described below exemplify a part of the embodiments of the present invention, and are not used for the purpose of limiting to these configurations, and do not depart from the gist of the present invention. The range can be changed as appropriate. Also, in FIG. 1 to FIG. 3, the teeth of the gear teeth are omitted for convenience of explanation.

  As shown in FIG. 1, the motor unit 20 includes a motor 22 and a gear mechanism 30 composed of a plurality of gears (gears) via a worm 24 connected to a rotating shaft 22a (see FIG. 3) of the motor 22. It is housed in the main body 28 in a state where it can be interlocked. The gear mechanism 30 includes a first gear 32 having a first tooth portion 32a and a second tooth portion 32b, a second gear 34 having a third tooth portion 34a and a fourth tooth portion 34b, and a fifth tooth portion 36a. The worm 24 and the first tooth portion 32a, the second tooth portion 32b and the third tooth portion 34a, and the fourth tooth portion 34b and the fifth tooth portion 36a are engaged with each other. For this reason, when the motor 22 is driven, the worm 24 rotates with the rotation of the rotating shaft 22 a, and the gear mechanism 30 operates with the rotation of the worm 24.

  The first gear 32 has a first tooth portion 32a and a second tooth portion 32b, and the second tooth portion 32b rotates the first rotation shaft 32c (see FIG. 3) as the rotation shaft as the first tooth portion 32a rotates. As a rotating gear. As shown in FIGS. 1 and 3, the first gear 32 is positioned at a position where the worm 24 and the first tooth portion 32 a, and the second tooth portion 32 b and the third tooth portion 34 a mesh with each other. With the rotation, the first tooth portion 32a meshing with the worm 24 rotates, and the first gear 32 rotates.

  The second gear 34 has a third tooth portion 34a and a fourth tooth portion 34b. As the third tooth portion 34a rotates, the fourth tooth portion 34b rotates the second rotation shaft 34c (see FIG. 3). As a rotating gear. As shown in FIGS. 1 and 3, the second gear 34 is a position where the second tooth portion 32b and the third tooth portion 34a, and the fourth tooth portion 34b and the fifth tooth portion 36a are engaged with each other. A third portion that is positioned at a position through which a part of the through hole 46 provided in the member 40 penetrates and meshes with the second tooth portion 32b as the second tooth portion 32b rotates as the first gear 32 rotates. The tooth portion 34a rotates and the second gear 34 rotates.

  The third gear 36 is an internal gear having a fifth tooth portion 36a, and the fifth tooth portion 36a rotates about the third rotation shaft 36b (see FIG. 3) as the rotation shaft in accordance with the rotation of the fourth tooth portion 34b. It is a gear. In addition, a fixed hole 36c in which a shaft can be attached is provided at the center of the third gear 36. As shown in FIGS. 1 and 3, the third gear 36 is located between the bearing member 40 and the cover member 48, and is a position where the fourth tooth portion 34 b and the fifth tooth portion 36 a mesh with each other. When the fourth tooth portion 34b rotates with the rotation of the second gear 34, the third gear 36 rotates with the rotation of the fifth tooth portion 36a meshing with the fourth tooth portion 34b. As shown in FIG. 3, the third rotary shaft 36 b is positioned coaxially with the first rotary shaft 32 c and the bearing member 40 interposed therebetween, and is pivotally fixed to the second bearing portion 44 of the bearing member 40. At this time, by using the third gear 36 as an internal gear, the gear mechanism 30 can be reduced in size compared to the case where the third gear 36 is an external gear.

  At this time, the second tooth portion 32b has a tooth number (not shown) of 10 and a module value of 0.65, and the third tooth portion 34a has a tooth number of 30 (not shown) and a module value of 0. Because of the .65 spur gear, the speed is reduced to one third by the second tooth portion 32b and the third tooth portion 34a. The fourth tooth portion 34b is a spur gear with a tooth number (not shown) of 7 and a module value of 0.85. The fifth tooth portion 36a has a tooth number of 33 (not shown) and a module value. Since it is a 0.85 internal gear, it is decelerated to 7/33 by the fourth tooth portion 34 and the fifth tooth portion 36a. For this reason, the gear mechanism 30 is decelerated to 7/99.

  Here, the positional relationship between the first gear 32, the second gear 34, and the third gear 36 will be described by paying attention to the rotation shafts of the respective gears. The first rotation shaft 32c that is the rotation shaft of the first gear 32, the second rotation shaft 34c that is the rotation shaft of the second gear 34, and the third rotation shaft 36b that is the rotation shaft of the third gear 36 are shown in FIG. As shown in FIG. 3, the distance between the first rotation shaft 32c and the second rotation shaft 34c ("a" in FIG. 3) and the distance between the second rotation shaft 34c and the third rotation shaft 36b (in FIG. b ") are equal distances, and the first rotating shaft 32c and the third rotating shaft 36b are disposed on the same axis. By carrying out like this, compared with the case where the 1st rotating shaft 32c and the 3rd rotating shaft 36b do not exist on the same axis | shaft, the gear mechanism 30 can be reduced in size.

  As shown in FIGS. 1 and 3, the bearing member 40 is positioned at a position between the main body portion 28 and the cover member 48, and includes a first bearing portion 42 provided on one surface side, and the other surface side. And a through-hole 46 penetrating from one surface side to the other surface side. The first bearing portion 42 and the second bearing portion 44 are provided at positions facing each other. By doing so, the first gear 32 can be fixed by the first bearing portion 42 and the third gear 36 can be fixed by the second bearing portion 44. In other words, since there is no need to provide separate bearing members for the first gear 32 and the second gear 34, the number of parts can be reduced and the labor during manufacturing can be reduced. Further, since a part of the second gear 34 penetrates the through hole 46, the rotational force of the first gear 32 provided on one side of the bearing member 40 is transmitted to the bearing member via the second gear 34. It is possible to transmit to the third gear 36 provided on the other surface side of 40. If it adds, the rotational force of the motor 22 arrange | positioned rather than the bearing member 40 at the main-body part 28 side can be transmitted to the cover part 48 side.

  In the motor unit 20 of the present embodiment described in detail above, the distance between the first rotating shaft 32c and the second rotating shaft 34c is equal to the distance between the second rotating shaft 34c and the third rotating shaft 36b. Since the one rotation shaft 32c and the third rotation shaft 36b are located on the same axis, the power transmission efficiency is higher than when the first rotation shaft 32c and the third rotation shaft 36b are not located on the same axis. Space can be saved without reducing or increasing the labor for manufacturing the gear mechanism.

  Moreover, since it has the bearing member 40 in which the 1st bearing part 42 and the 2nd bearing part 44 were provided, the one side of the 1st rotating shaft 32c and the one side of the 3rd rotating shaft 36b are shafted by the single member. The number of parts can be reduced and the labor at the time of manufacturing the gear mechanism can be reduced as compared with the case where the shaft is fixed by separate members.

  Furthermore, since the bearing member 40 has the through hole 46, the rotational force of the first gear 32 disposed on one side surface across the bearing member 40 is transmitted to the third gear 36 disposed on the other surface side. Can do.

  Furthermore, since the first gear 32 and the second gear 34 are external gears, and the third gear 36 is an internal gear, the transmission efficiency is improved compared to the case where the third gear 36 is an external gear. Space can be further saved without reducing or increasing the labor for manufacturing the gear mechanism.

  In addition, this invention is not limited to embodiment mentioned above at all, and as long as it belongs to the technical scope of this invention, it cannot be overemphasized that it can implement with a various aspect.

  For example, in the above-described embodiment, the first rotary shaft 32c and the third rotary shaft 36b are located on the same axis, but as shown in FIG. 4, the second rotary shaft 34c to the first rotary shaft 32c. Is located at a position where the inter-shaft angle ("c" in FIG. 4) formed by the straight line extending in the direction from the second rotating shaft 34c to the third rotating shaft 36b is 0 ° or more and less than 180 °. Also good. By doing so, space saving is achieved as compared with the case where the first rotation shaft 32c, the second rotation shaft 34c, and the third rotation shaft 36b are arranged in a straight line, that is, when the inter-axis angle is 180 °. can do. FIG. 4 is a side view of the motor unit 20 according to another embodiment. Also, in FIG. 4, the positions of the second rotating shaft 34c and the third rotating shaft 36b, that is, the positions of the second gear 34 and the third gear 36 are the same as those in the above-described embodiment, and therefore the same reference numerals are used. A description thereof will be omitted here. Further, the teeth provided on the gear teeth are omitted in the figure.

  In the case of adopting this aspect, the inter-axis angle may be 0 ° or more and less than 90 °. By doing so, it is possible to further save space compared to the case where the angle between the axes is 90 ° or more and less than 180 °. Further, the inter-axis angle may be 0 °, that is, may be positioned on a straight line, and the first rotating shaft 32c and the third rotating shaft 36b may be positioned on the same axis. In this way, further space saving can be achieved.

  In the embodiment described above, the number of teeth of the first tooth portion 32a (not shown) is 10, the value of the module is 0.65, the number of teeth of the second tooth portion 32b (not shown) is 30, and the value of the module. Is 0.65, the number of teeth of the third tooth 34a (not shown) is 7, the value of the module is 0.85, the number of teeth of the fourth tooth 34b (not shown) is 33, and the module value is Although it is assumed that the gear is 0.85, the number of teeth, the value of the module, and the type of gear are variously known as long as the positional relationship among the first gear 32, the second gear 34, and the third gear 36 is the same. These gears may be appropriately selected and used. Further, the transfer coefficients of the respective gears can be appropriately set so that the positional relationship among the first gear 32, the second gear 34, and the third gear 36 is the same according to the shape of the gear. In either case, the same effect as the above-described embodiment can be obtained.

  In the above-described embodiment, the third gear 36 is an internal gear. However, the present invention is not limited to this, and various known gears may be used. Even in such a case, the same effect as the above-described embodiment can be obtained.

  As shown in the above-described embodiment, it can be used in the dynamic field, particularly as a gear mechanism.

DESCRIPTION OF SYMBOLS 20 ... Motor unit, 22 ... Motor, 22a ... Rotating shaft, 24 ... Worm, 28 ... Body part, 30 ... Gear mechanism, 32 ... First gear, 32a ... First tooth part, 32b ... Second tooth part, 32c ... First rotating shaft 34 ... second gear 34a ... third tooth portion 34b ... fourth tooth portion 34c ... second rotating shaft 36 ... third gear 36a ... fifth tooth portion 36b ... third rotation Shaft, 36c ... fixed hole, 40 ... bearing member, 42 ... first bearing portion, 44 ... second bearing portion, 46 ... through hole, 48 ... cover member.

Claims (7)

A gear mechanism in which a plurality of gears are arranged at positions where respective rotation axes are parallel,
A first gear having a first tooth portion and a second tooth portion and rotating about the first rotation shaft;
A second gear having a third tooth portion and a fourth tooth portion meshing with the second tooth portion, and rotating around a second rotating shaft;
A third gear having a fifth tooth portion meshing with the fourth tooth portion and rotating around the third rotation shaft;
With
The distance between the first rotating shaft and the second rotating shaft is equal to the distance between the second rotating shaft and the third rotating shaft,
The inter-axis angle, which is an angle formed by a straight line extending from the second rotation axis to the first rotation axis and a straight line extending from the second rotation axis to the third rotation axis, is 0 ° or more and less than 180 °. Characterized by the
Gear mechanism. The inter-axis angle is 0 ° or more and less than 90 °,
The gear mechanism according to claim 1. The first rotating shaft and the third rotating shaft are located on the same axis,
The gear mechanism according to claim 1 or 2. A bearing member having a first bearing portion for locking one of the first rotating shafts and a second bearing portion for locking one of the third rotating shafts;
Characterized by comprising,
The gear mechanism according to any one of claims 1 to 3. The gear mechanism according to claim 4,
The bearing member further includes a through hole penetrating from a side where the first bearing portion is provided to a side where the second bearing portion is provided,
Gear mechanism. The first gear and the second gear are external gears,
The third gear is an internal gear,
The gear mechanism according to any one of claims 1 to 5. The gear mechanism according to any one of claims 1 to 6,
A motor for rotating a gear meshing with the first tooth portion;
Characterized by comprising
Motor unit.

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