WO2013141002A1 - Worm gear device - Google Patents

Worm gear device Download PDF

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Publication number
WO2013141002A1
WO2013141002A1 PCT/JP2013/055713 JP2013055713W WO2013141002A1 WO 2013141002 A1 WO2013141002 A1 WO 2013141002A1 JP 2013055713 W JP2013055713 W JP 2013055713W WO 2013141002 A1 WO2013141002 A1 WO 2013141002A1
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Prior art keywords
worm
worm wheel
ball
gear device
concave
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PCT/JP2013/055713
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French (fr)
Japanese (ja)
Inventor
裕樹 石田
瀬川　俊明
山田　篤
敦 寺尾
Original Assignee
株式会社椿本チエイン
ジヤトコ株式会社
椿本興業株式会社
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Application filed by 株式会社椿本チエイン, ジヤトコ株式会社, 椿本興業株式会社 filed Critical 株式会社椿本チエイン
Publication of WO2013141002A1 publication Critical patent/WO2013141002A1/en

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    • 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
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
    • F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
    • F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel
    • F16H1/163—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel with balls between the co-operating parts
    • 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
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/22—Toothed members; Worms for transmissions with crossing shafts, especially worms, worm-gears

Definitions

  • the present invention relates to a worm gear device having a worm and a worm wheel to transmit power from one of them to the other.
  • worm gear devices having a worm and a worm wheel to transmit power from the worm to the worm wheel are known (for example, Patent Documents 1 to 3).
  • the pins rotatable relative to the worm wheel are arranged at equal intervals on the outer periphery of the worm wheel, and the worm is through the pins It was configured to transmit power to the worm wheel.
  • balls made of a magnetic material rotatable with respect to the worm wheel are attracted and held by permanent magnets at equal intervals on the outer periphery of the worm wheel. was configured to transmit power to the worm wheel through the ball.
  • the worm gear device according to the first aspect of the invention described above has a structure that not only allows the pin to rotate only in a predetermined direction but also requires a plurality of members for rotatably holding the pin. There is a problem that it is difficult to reduce sufficiently and that the structure becomes complicated.
  • the worm gear device of the second aspect described above has a structure in which a ball made of a magnetic material is held by suction by a permanent magnet, it is difficult to secure a sufficient holding force against a very strong force from the worm. Was a problem.
  • the present invention solves the problems of the prior art as described above, that is, the object of the present invention is to keep the ball rotatably with a simple structure while sufficiently reducing the frictional force. Providing a worm gear device.
  • the invention according to claim 1 has a worm and a worm wheel whose direction intersecting with the worm rotational axis direction is the worm wheel rotational axis direction to transmit power from one of the worm and the worm wheel to the other.
  • the worm wheel comprises a pair of disc-like members superposed in the direction of the worm wheel rotational axis, and a plurality of balls in contact with a worm, and the like on each outer periphery of the pair of disc-like members
  • the plurality of concave holding portions disposed at intervals hold the plurality of balls rotatably in a pair in the rotational direction of the worm wheel, thereby solving the problems described above.
  • the concave holding portion is disposed closer to the worm wheel center than the tip of the tooth shape formed on the outer periphery of the worm wheel.
  • a part of the tooth surface of the worm is formed of a concave curved surface with respect to the ball, and the concave
  • the curvature of the curved surface of the above is larger than the curvature of the outer peripheral surface of the ball, thereby further solving the above-mentioned problems.
  • the concave holding portion has a convex portion which makes point contact or line contact with the ball. It solves the problem further.
  • the worm gear device has a worm and a worm wheel whose direction orthogonal to the worm rotational axis direction is the worm wheel rotational axis direction, whereby power can be transmitted from one of the worm and the worm wheel to the other. Not only can it be transmitted, but there can be the following specific effects.
  • the worm wheel is composed of a pair of disc-like members superimposed in the worm shaft rotational axis direction and a plurality of balls in contact with the worm.
  • the plurality of concave holding portions disposed at equal intervals on the respective outer peripheries of the second members hold the plurality of balls rotatably in pairs in the rotational direction of the worm wheel, whereby the worm and the balls are Since the rolling contact of the balls is achieved by meshing, the frictional force can be sufficiently reduced to increase the force transmission efficiency as compared with a structure in which the worm and the worm wheel are in direct contact with each other.
  • the two disk-like members having the concave holding portion are overlapped, the ball can be reliably held rotatably with a simple structure.
  • the concave holding portion is disposed closer to the worm wheel center than the tip of the tooth shape formed on the outer periphery of the worm wheel.
  • a part of the tooth surface of the worm is formed with a concave curved surface with respect to the ball,
  • the curvature of the concave curved surface is set to be larger than the curvature of the outer peripheral surface of the ball, so that the ball is in point contact with the tooth surface of the worm at a plurality of points, so the pressure acting on the ball from the tooth surface is dispersed. Surface pressure can be suppressed.
  • a part of the outer peripheral surface of the ball protrudes from the tooth surface of the worm wheel. Since the balls are disposed utilizing the tooth profile of the present invention, the balls can be brought into contact with the worm with a simple structure and the discoid member of the worm wheel can be prevented from coming into contact with the worm.
  • the concave holding portion has the convex portion which makes point contact or line contact with the ball. Since a gap is formed between the concave holding portion and the ball and this gap becomes an oil reservoir, the rotation of the ball can be made smooth and the oil can be prevented from running out.
  • the perspective view which shows the outline of the worm gear apparatus of 1st Example of this invention.
  • Sectional drawing which shows meshing of the worm
  • the present invention relates to a worm gear device having a worm and a worm wheel having a direction intersecting the worm rotational axis direction as a worm wheel rotational axis direction to transmit power from one of the worm and the worm wheel to the other.
  • the wheel is composed of a pair of disc-like members superimposed in the direction of the worm wheel rotation axis, and a plurality of balls in contact with the worm, and a plurality of the disc-like members disposed at equal intervals on the outer periphery of the pair of disc-like members.
  • the concave holding portion holds the plurality of balls rotatably in pairs in the rotational direction of the worm wheel so that the frictional force is sufficiently reduced as compared with a structure in which the worm and the worm wheel are in direct contact with each other. If the ball can be held rotatably with a simple structure, the concrete Aspects, may be any one.
  • the material of the ball may be any material such as metal, ceramics, resin, etc. as long as it has a certain degree of durability.
  • the shape of the worm it may be a cylindrical worm, or may be an hourglass in order to obtain a high engagement ratio.
  • FIGS. 1 to 5C a worm gear device 100 according to a first embodiment of the present invention will be described based on FIGS. 1 to 5C.
  • the worm gear device 100 has a worm 110 and a worm wheel 120 whose direction intersecting with the worm rotational axis direction is the worm wheel rotational axis direction.
  • the worm wheel 120 is composed of a pair of disc-like members (121, 122) superimposed in the direction of the worm wheel rotation axis, and a plurality of balls 123, 123.
  • the plurality of concave holding portions 121a, 121a, 122a, 122a, ... arranged at equal intervals on the outer circumferences of the members (121, 122) form a pair of the plurality of balls 123, 123, ... in the worm wheel rotational axis direction
  • Each is held rotatably.
  • the worm wheel 120 is composed of a first disc-like member 121, a second disc-like member 122, and a plurality of balls 123, 123.
  • concave holding portions 121a, 121a, ..., 122a, 122a, ... are arranged at equal intervals on the outer circumferences of the first disk-shaped member 121 and the second disk-shaped member 122, respectively.
  • the first holding member 121 and the second disk 121 are held such that the holding member 121a of the holding member 121 and the holding member 122a of the second disk-shaped member 122 are paired in the rotational direction of the worm wheel to hold a part of the ball 123.
  • the second member 122 and the second member 122 are overlapped and relatively fixed.
  • the ball 123 is rotatably held. Be done. Furthermore, since oil as a lubricant is applied to the outer peripheral surface 123a of the ball 123, the ball 123 can rotate smoothly with respect to the first disc-like member 121 and the second disc-like member 122.
  • the shape of the second disk-like member 122 is the same as the shape of the first disk-like member 121, and the second disk-like member 122 is arranged with the first disk-like member 121 turned upside down.
  • the details of the first disc-like member 121 will be described using FIGS. 2 and 4 to 5C, and the detailed description of the second disc-like member 122 will be omitted.
  • the relative fixing method of the first disk-shaped member 121 and the second disk-shaped member 122 may be any mode as long as they can be fixed relatively, such as screwing or welding.
  • the concave holding portion 121 a of the first disk-shaped member 121 has a concave surface corresponding to the outer peripheral surface 123 a of the ball 123.
  • a small convex portion may be provided on the concave curved surface of the concave holding portion 121 a so as to be in point contact or line contact with the outer peripheral surface 123 a of the ball 123. Thereby, a gap is positively formed between the concave holding portion 121a and the ball 123, and the gap becomes an oil reservoir.
  • the concave holding portion 121 a is disposed on the worm wheel center side with respect to the end 121 b of the tooth shape formed on the outer periphery of the worm wheel 120.
  • the tip 121b of the tooth profile regulates the movement of the ball 123 in the worm wheel radial direction.
  • a part of the outer peripheral surface 123 a of the ball 123 protrudes from the tooth surface 121 c of the worm wheel 120.
  • the ball 123 is disposed using the tooth profile of the worm wheel 120.
  • the other worm 110 has a helical tooth shape as shown in FIG. 3, and the tooth surface 111 is formed by a concave curved surface 111a. Then, as shown in FIG. 4, the location of the concave curved surface 111 a of the tooth surface 111 of the worm 110 contacts the outer peripheral surface 123 a of the ball 123 from the upstream side in the worm wheel rotation direction.
  • the tip 121 b of the tooth shape of the worm wheel 120 enters the tooth bottom portion 112 of the worm 110.
  • the driving force from the worm 110 is received by the first disc-like member 121 and the second disc while the ball 123 rotates in accordance with the rotational direction of the contact portion with the worm 110 under the driving force from the worm 110. It transmits to the second member 122.
  • the entire worm wheel 120 rotates in the direction of arrow B.
  • curvature R1 of concave surface of concave holding portion 121a is R1
  • the curvature of the outer peripheral surface 123a of the ball 123 is R2
  • the curvature of the concave surface 111a of the tooth surface 111 of the worm 110 is R3.
  • Curvature R1 of concave surface of concave holding portion 121a ⁇ curvature R2 of outer peripheral surface 123a of ball 123
  • Curvature R3 of concave curved surface 111a of tooth surface 111 of worm 110 ⁇ curvature R2 of outer peripheral surface 123a of ball 123 It is comprised so that the relationship of may be materialized.
  • the radius of the concave surface of the concave holding portion 121a is r1
  • the radius of the outer peripheral surface 123a of the ball 123 is r2
  • the concave surface of the tooth surface 111 of the worm 110 Assuming that the radius of 111a is r3 Radius r1 of concave surface of concave holding portion 121a> radius r2 of outer periphery of ball 123 Radius r3 of concave curved surface 111a of tooth surface 111 of worm 110> radius r2 of outer periphery of ball 123 It is comprised so that the relationship of may be materialized.
  • the concave curved surface 111a of the tooth surface 111 of the worm 110 and the outer peripheral surface 123a of the ball 123 are not point contact but line contact or surface contact, and the outer peripheral surface 123a of the ball 123 and the concave holding portion 121a are Since not a point contact but a line contact or a surface contact, it is possible to efficiently receive the force acting on the downstream side of the worm wheel rotation direction among the forces received by the ball 123 from the worm 110.
  • the concave holding portion 121a is a ball Among the forces received from 123, the force acting on the downstream side in the rotational direction of the worm wheel can be received.
  • the concave surface of the concave holding portion 121a may be a concave surface corresponding to a ball 123 (elliptic sphere) in which the vertical Dv is smaller than the horizontal Dh.
  • the curvature R1 (radius r1) of the concave surface of the concave holding portion 121a is not constant but changes according to the concave surface. .
  • the worm gear device 100 as a reduction gear in which power is transmitted from the worm 110 to the worm wheel 120 via the ball 123 has been described in the present embodiment, the structure is compared with a structure in which the worm 110 and the worm wheel 120 directly contact. Therefore, the worm gear device 100 may be a speed increasing device in which the power is transmitted from the worm wheel 120 to the worm 110 via the ball 123 because the frictional force is sufficiently reduced and the so-called self-lock does not occur.
  • the worm wheel 120 is a first disc-like member 121 and a second disc-like member which are a pair of disc-like members superimposed in the direction of the worm wheel rotation axis.
  • a plurality of concave holding members consisting of a member 122 and a plurality of balls 123 in contact with the worm 110, and arranged at equal intervals on the outer periphery of the first disk-shaped member 121 and the second disk-shaped member 122
  • the parts 121a, 121a, ... 122a, 122a, ... are held rotatably as a pair of balls 123, 123 ...
  • the concave holding portion 121a (122a) is disposed on the worm wheel center side with respect to the end 121b of the tooth shape formed on the outer periphery of the worm wheel 120, so that the centrifugal force accompanying the rotation of the worm wheel 120 is counteracted. Falling of the ball 123 can be prevented. Further, since a part of the outer peripheral surface 123a of the ball 123 protrudes from the tooth surface 121c of the worm wheel 120, the ball 123 can be brought into contact with the worm 110 with a simple structure and the disk shaped member of the worm wheel 120 Can be prevented from coming into contact with the worm 110.
  • the concave holding portion 121a (122a) has a convex portion (not shown) in point contact or line contact with the ball 123, the rotation of the ball 123 can be made smooth and oil breakage is caused. Its effect is enormous, as it can be prevented.
  • a part of the tooth surface 211 of the worm 210 is formed of a concave curved surface 211a with respect to the ball 223, and the curvature R3 of the concave curved surface 211a is provided larger than the curvature R2 of the outer peripheral surface 223a of the ball 223 ing. Since the reciprocal of curvature is the radius (curvature radius), in other words, the radius r3 of the concave curved surface 211a is smaller than the radius r2 of the outer periphery of the ball 223. Thereby, the ball 223 is in point contact with the tooth surface 211 of the worm 210 at a plurality of points T1 and T2.
  • the concave curved surface 211a is a curved surface whose section is a part of an ellipse, and the curvature R3 of a part of the curved surface is set to be larger than the curvature R2 of the ball 223.
  • the surface 211 may be in point contact with a plurality of points T1 and T2. That is, the curvature R3 of the concave curved surface 211a of the tooth surface 211 of the worm 210 while in point contact with the ball 223 at two points T1 and T2 may be freely determined.
  • a part of the tooth surface 211 of the worm 210 is formed with a curved surface 211 a concave to the ball 223, and the concave curved surface 211 a
  • the effect of the invention is remarkable, such as that the pressure acting on the ball 223 from the tooth surface 211 can be dispersed and the surface pressure can be suppressed by providing the curvature R3 of the ball to be larger than the curvature R2 of the outer peripheral surface 223a of the ball 223 It is.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gear Transmission (AREA)
  • Gears, Cams (AREA)

Abstract

There is provided a worm gear device for securely holding balls in a rotatable manner using adequately low friction and a simple construction. A worm gear device (100) is characterized in that a worm wheel (120) comprises a pair of annular members (121, 122) joined together in the axial direction of the worm wheel, and a plurality of balls (123, 123...) for making contact with a worm (110), and a plurality of concave holding parts (121a, 121a..., 122a, 122a...) embedded in equal intervals in the outer peripheries of the pair of annular members (121, 122) form pairs in the axial direction of the worm wheel to rotatably hold the plurality of balls (123, 123...).

Description

ウォームギア装置Worm gear device
　本発明は、ウォームとウォームホイールとを有してこれらの一方から他方へ動力を伝達するウォームギア装置に関する。 The present invention relates to a worm gear device having a worm and a worm wheel to transmit power from one of them to the other.
　従来、ウォームとウォームホイールとを有してウォームからウォームホイールへ動力を伝達するウォームギア装置が知られている（例えば、特許文献１～３）。
　特許文献１および特許文献２に記載された従来の第１の態様のウォームギア装置は、ウォームホイールに対して回転可能なピンがウォームホイールの外周に等間隔に配設され、ウォームがピンを介してウォームホイールに動力を伝達するように構成されていた。
　また、特許文献３に記載された従来の第２の態様のウォームギア装置は、ウォームホイールに対して回転可能な磁性材料からなるボールがウォームホイールの外周に等間隔に永久磁石によって吸着保持され、ウォームがボールを介してウォームホイールに動力を伝達するように構成されていた。 Conventionally, worm gear devices having a worm and a worm wheel to transmit power from the worm to the worm wheel are known (for example, Patent Documents 1 to 3).
In the conventional worm gear device of the first aspect described in Patent Document 1 and Patent Document 2, the pins rotatable relative to the worm wheel are arranged at equal intervals on the outer periphery of the worm wheel, and the worm is through the pins It was configured to transmit power to the worm wheel.
Further, in the worm gear device of the second aspect described in Patent Document 3, balls made of a magnetic material rotatable with respect to the worm wheel are attracted and held by permanent magnets at equal intervals on the outer periphery of the worm wheel. Was configured to transmit power to the worm wheel through the ball.
特表２００９－５２４７８５号公報JP 2009-524785 gazette 特開昭６１－１６５０６７号公報Japanese Patent Application Laid-Open No. 61-165067 特開２００９－２１０００４号公報JP, 2009-210004, A
　しかしながら、上述した従来の第１の態様のウォームギア装置は、ピンが所定の方向にしか回転しないばかりでなくピンを回転自在に保持するための部材を複数必要とする構造であったため、摩擦力を十分に低減することが困難であるという問題および構造が複雑となるという問題があった。
　また、上述した第２の態様のウォームギア装置は、磁性材料からなるボールを永久磁石によって吸着保持する構造であったため、ウォームからの非常に強い力に対して十分な保持力を確保することが困難であるという問題があった。 However, the worm gear device according to the first aspect of the invention described above has a structure that not only allows the pin to rotate only in a predetermined direction but also requires a plurality of members for rotatably holding the pin. There is a problem that it is difficult to reduce sufficiently and that the structure becomes complicated.
In addition, since the worm gear device of the second aspect described above has a structure in which a ball made of a magnetic material is held by suction by a permanent magnet, it is difficult to secure a sufficient holding force against a very strong force from the worm. Was a problem.
　そこで、本発明は、前述したような従来技術の問題を解決するものであって、すなわち、本発明の目的は、摩擦力を十分に小さくするとともに簡単な構造で確実にボールを回転自在に保持するウォームギア装置を提供することである。 Therefore, the present invention solves the problems of the prior art as described above, that is, the object of the present invention is to keep the ball rotatably with a simple structure while sufficiently reducing the frictional force. Providing a worm gear device.
　本請求項１に係る発明は、ウォームと、ウォーム回転軸方向に対して交差する方向をウォームホイール回転軸方向とするウォームホイールとを有してウォームおよびウォームホイールの一方から他方へ動力を伝達するウォームギア装置において、前記ウォームホイールが、前記ウォームホイール回転軸方向に重ね合わせた一対の円盤状部材と、ウォームと接触する複数のボールとからなるとともに、該一対の円盤状部材のそれぞれの外周に等間隔で配設した複数の凹状保持部が、前記複数のボールをウォームホイール回転軸方向で対となって回転自在にそれぞれ保持していることにより、前述した課題を解決するものである。 The invention according to claim 1 has a worm and a worm wheel whose direction intersecting with the worm rotational axis direction is the worm wheel rotational axis direction to transmit power from one of the worm and the worm wheel to the other. In the worm gear device, the worm wheel comprises a pair of disc-like members superposed in the direction of the worm wheel rotational axis, and a plurality of balls in contact with a worm, and the like on each outer periphery of the pair of disc-like members The plurality of concave holding portions disposed at intervals hold the plurality of balls rotatably in a pair in the rotational direction of the worm wheel, thereby solving the problems described above.
　本請求項２に係る発明は、請求項１に記載されたウォームギア装置の構成に加えて、前記凹状保持部が、前記ウォームホイールの外周に形成した歯形の先端よりウォームホイール中心側に配設されていることにより、前述した課題をさらに解決するものである。 In the invention according to the second aspect, in addition to the configuration of the worm gear device described in the first aspect, the concave holding portion is disposed closer to the worm wheel center than the tip of the tooth shape formed on the outer periphery of the worm wheel. By doing this, the problem described above is further solved.
　本請求項３に係る発明は、請求項１に記載されたウォームギア装置の構成に加え、前記ウォームの歯面の一部が、前記ボールに対して凹状の曲面で形成されているとともに、該凹状の曲面の曲率が、前記ボールの外周面の曲率より大きく設けられていることにより、前述した課題をさらに解決するものである。 In the invention according to claim 3, in addition to the configuration of the worm gear device described in claim 1, a part of the tooth surface of the worm is formed of a concave curved surface with respect to the ball, and the concave The curvature of the curved surface of the above is larger than the curvature of the outer peripheral surface of the ball, thereby further solving the above-mentioned problems.
　本請求項４に係る発明は、請求項１に記載されたウォームギア装置の構成に加え、前記ボールの外周面の一部が、前記ウォームホイールの歯面から突出していることにより、前述した課題をさらに解決するものである。 In the invention according to claim 4, in addition to the configuration of the worm gear device described in claim 1, a part of the outer peripheral surface of the ball protrudes from the tooth surface of the worm wheel, thereby achieving the above-mentioned problem. It will be solved further.
　本請求項５に係る発明は、請求項１に記載されたウォームギア装置の構成に加え、前記凹状保持部が、前記ボールと点接触または線接触する凸部を有していることにより、前述した課題をさらに解決するものである。 In the invention according to claim 5, in addition to the configuration of the worm gear device described in claim 1, the concave holding portion has a convex portion which makes point contact or line contact with the ball. It solves the problem further.
　本発明のウォームギア装置は、ウォームと、ウォーム回転軸方向に対して交差する方向をウォームホイール回転軸方向とするウォームホイールとを有していることにより、ウォームおよびウォームホイールの一方から他方へ動力を伝達することができるばかりでなく、以下のような特有の効果を奏することができる。 The worm gear device according to the present invention has a worm and a worm wheel whose direction orthogonal to the worm rotational axis direction is the worm wheel rotational axis direction, whereby power can be transmitted from one of the worm and the worm wheel to the other. Not only can it be transmitted, but there can be the following specific effects.
　本請求項１に係る発明のウォームギア装置によれば、ウォームホイールが、ウォームホイール回転軸方向に重ね合わせた一対の円盤状部材と、ウォームと接触する複数のボールとからなるとともに、この一対の円盤状部材のそれぞれの外周に等間隔で配設した複数の凹状保持部が、複数のボールをウォームホイール回転軸方向で対となって回転自在にそれぞれ保持していることにより、ウォームとボールとが噛み合ってボールの転がり伝達となるため、ウォームとウォームホイールとが直接接触する構造と比べて摩擦力を十分に小さくして力の伝達効率を高くすることができる。
　さらに、凹状保持部を有する２枚の円盤状部材を重ね合わせるため、簡単な構造で確実にボールを回転自在に保持できる。 According to the worm gear device of the first aspect of the present invention, the worm wheel is composed of a pair of disc-like members superimposed in the worm shaft rotational axis direction and a plurality of balls in contact with the worm. The plurality of concave holding portions disposed at equal intervals on the respective outer peripheries of the second members hold the plurality of balls rotatably in pairs in the rotational direction of the worm wheel, whereby the worm and the balls are Since the rolling contact of the balls is achieved by meshing, the frictional force can be sufficiently reduced to increase the force transmission efficiency as compared with a structure in which the worm and the worm wheel are in direct contact with each other.
Furthermore, since the two disk-like members having the concave holding portion are overlapped, the ball can be reliably held rotatably with a simple structure.
　本請求項２に係る発明のウォームギア装置によれば、請求項１に係る発明が奏する効果に加えて、凹状保持部が、ウォームホイールの外周に形成した歯形の先端よりウォームホイール中心側に配設されていることにより、歯形の先端がウォームホイール放射方向へのボールの移動を規制するため、ウォームホイールの回転に伴う遠心力に対抗してボールの脱落を防止できる。 According to the worm gear device of the invention as set forth in claim 2, in addition to the effects exhibited by the invention as set forth in claim 1, the concave holding portion is disposed closer to the worm wheel center than the tip of the tooth shape formed on the outer periphery of the worm wheel. As a result, since the tip of the tooth profile regulates the movement of the ball in the radial direction of the worm wheel, the ball can be prevented from falling off against the centrifugal force accompanying the rotation of the worm wheel.
　本請求項３に係る発明のウォームギア装置によれば、請求項１に係る発明が奏する効果に加えて、ウォームの歯面の一部が、ボールに対して凹状の曲面で形成されているとともに、この凹状の曲面の曲率が、ボールの外周面の曲率より大きく設けられていることにより、ボールがウォームの歯面と複数の箇所で点接触するため、歯面からボールに作用する圧力を分散して面圧を抑えることができる。 According to the worm gear device of the invention according to claim 3, in addition to the effect exhibited by the invention according to claim 1, a part of the tooth surface of the worm is formed with a concave curved surface with respect to the ball, The curvature of the concave curved surface is set to be larger than the curvature of the outer peripheral surface of the ball, so that the ball is in point contact with the tooth surface of the worm at a plurality of points, so the pressure acting on the ball from the tooth surface is dispersed. Surface pressure can be suppressed.
　本請求項４に係る発明のウォームギア装置によれば、請求項１に係る発明が奏する効果に加えて、ボールの外周面の一部が、ウォームホイールの歯面から突出していることにより、ウォームホイールの歯形を利用してボールが配設されるため、簡単な構造でボールをウォームと接触させることができるとともにウォームホイールの円盤状部材がウォームと接触することを防止できる。 According to the worm gear device of the invention as set forth in claim 4, in addition to the effect exhibited by the invention as set forth in claim 1, a part of the outer peripheral surface of the ball protrudes from the tooth surface of the worm wheel. Since the balls are disposed utilizing the tooth profile of the present invention, the balls can be brought into contact with the worm with a simple structure and the discoid member of the worm wheel can be prevented from coming into contact with the worm.
　本請求項５に係る発明のウォームギア装置によれば、請求項１に係る発明が奏する効果に加えて、凹状保持部が、ボールと点接触または線接触する凸部を有していることにより、凹状保持部とボールとの間に隙間ができこの隙間が油溜まりとなるため、ボールの回転をスムーズにすることができるとともに油切れを防止できる。 According to the worm gear device of the invention as set forth in claim 5, in addition to the effect exhibited by the invention as set forth in claim 1, the concave holding portion has the convex portion which makes point contact or line contact with the ball. Since a gap is formed between the concave holding portion and the ball and this gap becomes an oil reservoir, the rotation of the ball can be made smooth and the oil can be prevented from running out.
本発明の第１実施例のウォームギア装置の概略を示す斜視図。BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the outline of the worm gear apparatus of 1st Example of this invention. 本発明の第１実施例のウォームギア装置のウォームホイールの要部拡大斜視図。The principal part expansion perspective view of the worm wheel of the worm gear apparatus of 1st Example of this invention. 本発明の第１実施例のウォームギア装置のウォームの平面図。The top view of the worm | warm of the worm gear apparatus of 1st Example of this invention. 本発明の第１実施例のウォームとウォームホイールのボールとの噛み合いを示す断面図。Sectional drawing which shows meshing of the worm | warm of 1st Example of this invention, and the ball | bowl of a worm wheel. 本発明の第１実施例のウォームホイールの凹状保持部の形状を示す図。The figure which shows the shape of the concave shape holding | maintenance part of the worm wheel of 1st Example of this invention. 本発明の第１実施例のウォームホイールの凹状保持部の形状の変形例を示す図。The figure which shows the modification of the shape of the concave holding part of the worm wheel of 1st Example of this invention. 本発明の第１実施例のウォームホイールの凹状保持部の形状の変形例を示す図。The figure which shows the modification of the shape of the concave holding part of the worm wheel of 1st Example of this invention. 本発明の第２実施例のウォームの歯面とボールの外周面との関係を示す断面図。Sectional drawing which shows the relationship between the tooth flank of the worm | warm of 2nd Example of this invention, and the outer peripheral surface of a ball | bowl.
　本発明は、ウォームと、ウォーム回転軸方向に対して交差する方向をウォームホイール回転軸方向とするウォームホイールとを有してウォームおよびウォームホイールの一方から他方へ動力を伝達するウォームギア装置において、ウォームホイールが、ウォームホイール回転軸方向に重ね合わせた一対の円盤状部材と、ウォームと接触する複数のボールとからなるとともに、この一対の円盤状部材のそれぞれの外周に等間隔で配設した複数の凹状保持部が、複数のボールをウォームホイール回転軸方向で対となって回転自在にそれぞれ保持していることによって、ウォームとウォームホイールとが直接接触する構造と比べて摩擦力を十分に小さくなるとともに簡単な構造で確実にボールを回転自在に保持するものであれば、その具体的な実施態様は、如何なるものであっても構わない。 The present invention relates to a worm gear device having a worm and a worm wheel having a direction intersecting the worm rotational axis direction as a worm wheel rotational axis direction to transmit power from one of the worm and the worm wheel to the other. The wheel is composed of a pair of disc-like members superimposed in the direction of the worm wheel rotation axis, and a plurality of balls in contact with the worm, and a plurality of the disc-like members disposed at equal intervals on the outer periphery of the pair of disc-like members. The concave holding portion holds the plurality of balls rotatably in pairs in the rotational direction of the worm wheel so that the frictional force is sufficiently reduced as compared with a structure in which the worm and the worm wheel are in direct contact with each other. If the ball can be held rotatably with a simple structure, the concrete Aspects, may be any one.
　例えば、ボールの素材は、金属、セラミックス、樹脂等、ある程度耐久性を有するものであれば如何なるものであっても構わない。
　また、ボールは、ウォームと接触することによりウォームホイールに対して回転できればよく、表面の曲率（半径ｒの円周の曲率＝１／半径ｒ）が一定の真円球でも表面の曲率が箇所によって変化する楕円球でもよい。
　さらに、ウォームの形状については、円筒形ウォームでもよいし、高い噛み合い率を得るために鼓形ウォームとしてもよい。 For example, the material of the ball may be any material such as metal, ceramics, resin, etc. as long as it has a certain degree of durability.
Also, the ball should be able to rotate with respect to the worm wheel by contacting the worm, and even if the curvature of the surface (curvature of radius r = 1 / radius r) is constant, the curvature of the surface depends on the location It may be a changing elliptical sphere.
Further, as to the shape of the worm, it may be a cylindrical worm, or may be an hourglass in order to obtain a high engagement ratio.
　以下に、本発明の第１実施例であるウォームギア装置１００について、図１乃至図５Ｃに基づいて説明する。 Hereinafter, a worm gear device 100 according to a first embodiment of the present invention will be described based on FIGS. 1 to 5C.
　本発明の第１実施例であるウォームギア装置１００は、ウォーム１１０と、ウォーム回転軸方向に対して交差する方向をウォームホイール回転軸方向とするウォームホイール１２０とを有している。
　さらに、ウォームホイール１２０が、ウォームホイール回転軸方向に重ね合わせた一対の円盤状部材（１２１、１２２）と、ウォーム１１０と接触する複数のボール１２３、１２３…とからなるとともに、この一対の円盤状部材（１２１、１２２）のそれぞれの外周に等間隔で配設した複数の凹状保持部１２１ａ、１２１ａ…、１２２ａ、１２２ａ…が、複数のボール１２３、１２３…をウォームホイール回転軸方向で対となって回転自在にそれぞれ保持している。
　これにより、図１に示すようにウォーム１１０が矢印Ａの示す方向へ回転してウォームホイール１２０全体が矢印Ｂの示す方向へ回転する際、ウォーム１１０とボール１２３とが噛み合って所謂、ボール１２３の転がり伝達となる。 The worm gear device 100 according to the first embodiment of the present invention has a worm 110 and a worm wheel 120 whose direction intersecting with the worm rotational axis direction is the worm wheel rotational axis direction.
Further, the worm wheel 120 is composed of a pair of disc-like members (121, 122) superimposed in the direction of the worm wheel rotation axis, and a plurality of balls 123, 123. The plurality of concave holding portions 121a, 121a, 122a, 122a, ... arranged at equal intervals on the outer circumferences of the members (121, 122) form a pair of the plurality of balls 123, 123, ... in the worm wheel rotational axis direction Each is held rotatably.
Thereby, as shown in FIG. 1, when the worm 110 rotates in the direction indicated by the arrow A and the entire worm wheel 120 rotates in the direction indicated by the arrow B, the worm 110 and the ball 123 mesh with each other. It becomes rolling transmission.
　具体的に、ウォームホイール１２０は、図１に示すように第１円盤状部材１２１と第２円盤状部材１２２と複数のボール１２３、１２３…とから構成されている。
　このうち、第１円盤状部材１２１および第２円盤状部材１２２のそれぞれの外周には、等間隔で凹状保持部１２１ａ、１２１ａ…、１２２ａ、１２２ａ…が配設されており、第１円盤状部材１２１の凹状保持部１２１ａと第２円盤状部材１２２の凹状保持部１２２ａとがウォームホイール回転軸方向で対となってボール１２３の一部を抱え込むようにして第１円盤状部材１２１と第２円盤状部材１２２とが重ね合わされて相対的に固定されている。 Specifically, as shown in FIG. 1, the worm wheel 120 is composed of a first disc-like member 121, a second disc-like member 122, and a plurality of balls 123, 123.
Among the above, concave holding portions 121a, 121a, ..., 122a, 122a, ... are arranged at equal intervals on the outer circumferences of the first disk-shaped member 121 and the second disk-shaped member 122, respectively. The first holding member 121 and the second disk 121 are held such that the holding member 121a of the holding member 121 and the holding member 122a of the second disk-shaped member 122 are paired in the rotational direction of the worm wheel to hold a part of the ball 123. The second member 122 and the second member 122 are overlapped and relatively fixed.
　ここで、第１円盤状部材１２１の凹状保持部１２１ａおよび第２円盤状部材１２２の凹状保持部１２２ａの少なくとも一方とボール１２３との間で僅かな隙間があるため、ボール１２３は回転自在に保持される。
　さらに、ボール１２３の外周面１２３ａに潤滑剤としての油はグリスが塗布されているため、ボール１２３は第１円盤状部材１２１および第２円盤状部材１２２に対してスムーズに回転できる。 Here, since there is a slight gap between the ball 123 and at least one of the concave holding portion 121a of the first disk-shaped member 121 and the concave holding portion 122a of the second disk-shaped member 122, the ball 123 is rotatably held. Be done.
Furthermore, since oil as a lubricant is applied to the outer peripheral surface 123a of the ball 123, the ball 123 can rotate smoothly with respect to the first disc-like member 121 and the second disc-like member 122.
　なお、本実施例では、第２円盤状部材１２２の形状は第１円盤状部材１２１の形状と同様であり第２円盤状部材１２２は第１円盤状部材１２１を表裏反転して配置したものに相当するので、図２、図４乃至図５Ｃを用いて第１円盤状部材１２１の詳細について説明することとし、第２円盤状部材１２２の詳しい説明は省略することとする。
　また、第１円盤状部材１２１および第２円盤状部材１２２の相対的な固定の仕方は、ねじ止めや溶接等、相対的に固定できればいかなる態様であってもよい。 In the present embodiment, the shape of the second disk-like member 122 is the same as the shape of the first disk-like member 121, and the second disk-like member 122 is arranged with the first disk-like member 121 turned upside down. As it corresponds, the details of the first disc-like member 121 will be described using FIGS. 2 and 4 to 5C, and the detailed description of the second disc-like member 122 will be omitted.
The relative fixing method of the first disk-shaped member 121 and the second disk-shaped member 122 may be any mode as long as they can be fixed relatively, such as screwing or welding.
　図２に示すように、第１円盤状部材１２１の凹状保持部１２１ａは、ボール１２３の外周面１２３ａと対応した凹曲面を有している。
　なお、凹状保持部１２１ａの凹曲面に小さな凸部を設けてボール１２３の外周面１２３ａと点接触または線接触するように構成してもよい。
　これにより、凹状保持部１２１ａとボール１２３との間に積極的に隙間ができ、この隙間が油溜まりとなる。 As shown in FIG. 2, the concave holding portion 121 a of the first disk-shaped member 121 has a concave surface corresponding to the outer peripheral surface 123 a of the ball 123.
A small convex portion may be provided on the concave curved surface of the concave holding portion 121 a so as to be in point contact or line contact with the outer peripheral surface 123 a of the ball 123.
Thereby, a gap is positively formed between the concave holding portion 121a and the ball 123, and the gap becomes an oil reservoir.
　また、凹状保持部１２１ａが、ウォームホイール１２０の外周に形成した歯形の先端１２１ｂよりウォームホイール中心側に配設されている。
　これにより、歯形の先端１２１ｂがウォームホイール放射方向へのボール１２３の移動を規制する。
　さらに、ボール１２３の外周面１２３ａの一部が、ウォームホイール１２０の歯面１２１ｃから突出している。
　これにより、ウォームホイール１２０の歯形を利用してボール１２３が配設される。 In addition, the concave holding portion 121 a is disposed on the worm wheel center side with respect to the end 121 b of the tooth shape formed on the outer periphery of the worm wheel 120.
Thereby, the tip 121b of the tooth profile regulates the movement of the ball 123 in the worm wheel radial direction.
Furthermore, a part of the outer peripheral surface 123 a of the ball 123 protrudes from the tooth surface 121 c of the worm wheel 120.
Thereby, the ball 123 is disposed using the tooth profile of the worm wheel 120.
　他方のウォーム１１０は、図３に示すように、らせん状の歯形を有しており、歯面１１１が凹状の曲面１１１ａで形成されている。
　そして、図４に示すように、ウォーム１１０の歯面１１１の凹状の曲面１１１ａの箇所が、ウォームホイール回転方向上流側からボール１２３の外周面１２３ａと接触する。 The other worm 110 has a helical tooth shape as shown in FIG. 3, and the tooth surface 111 is formed by a concave curved surface 111a.
Then, as shown in FIG. 4, the location of the concave curved surface 111 a of the tooth surface 111 of the worm 110 contacts the outer peripheral surface 123 a of the ball 123 from the upstream side in the worm wheel rotation direction.
　このとき、ウォーム１１０の歯底部１１２にウォームホイール１２０の歯形の先端１２１ｂが入り込むため無駄が無い。
　ウォーム１１０が回転すると、ウォーム１１０からの駆動力を受けてボール１２３がウォーム１１０との接触箇所の回転方向に倣って回転しながらウォーム１１０からの駆動力を第１円盤状部材１２１および第２円盤状部材１２２へ伝達する。
　したがって、ウォームホイール１２０全体が矢印Ｂの方向へ回転する。 At this time, there is no waste because the tip 121 b of the tooth shape of the worm wheel 120 enters the tooth bottom portion 112 of the worm 110.
When the worm 110 rotates, the driving force from the worm 110 is received by the first disc-like member 121 and the second disc while the ball 123 rotates in accordance with the rotational direction of the contact portion with the worm 110 under the driving force from the worm 110. It transmits to the second member 122.
Thus, the entire worm wheel 120 rotates in the direction of arrow B.
　さらに、図４に示すように、凹状保持部１２１ａの凹曲面の曲率をＲ１、ボール１２３の外周面１２３ａの曲率をＲ２、ウォーム１１０の歯面１１１の凹状の曲面１１１ａの曲率をＲ３とすると、
　凹状保持部１２１ａの凹曲面の曲率Ｒ１　＜　ボール１２３の外周面１２３ａの曲率Ｒ２
　ウォーム１１０の歯面１１１の凹状の曲面１１１ａの曲率Ｒ３　＜　ボール１２３の外周面１２３ａの曲率Ｒ２
の関係が成立するように構成されている。 Furthermore, as shown in FIG. 4, assuming that the curvature of the concave surface of the concave holding portion 121a is R1, the curvature of the outer peripheral surface 123a of the ball 123 is R2, and the curvature of the concave surface 111a of the tooth surface 111 of the worm 110 is R3.
Curvature R1 of concave surface of concave holding portion 121a <curvature R2 of outer peripheral surface 123a of ball 123
Curvature R3 of concave curved surface 111a of tooth surface 111 of worm 110 <curvature R2 of outer peripheral surface 123a of ball 123
It is comprised so that the relationship of may be materialized.
　曲率の逆数が半径（曲率半径）であることから、言い換えると、凹状保持部１２１ａの凹曲面の半径をｒ１、ボール１２３の外周面１２３ａの半径をｒ２、ウォーム１１０の歯面１１１の凹状の曲面１１１ａの半径をｒ３とすると、
　凹状保持部１２１ａの凹曲面の半径ｒ１　＞　ボール１２３の外周の半径ｒ２
　ウォーム１１０の歯面１１１の凹状の曲面１１１ａの半径ｒ３　＞　ボール１２３の外周の半径ｒ２
の関係が成立するように構成されている。 Since the reciprocal of the curvature is the radius (curvature radius), in other words, the radius of the concave surface of the concave holding portion 121a is r1, the radius of the outer peripheral surface 123a of the ball 123 is r2, and the concave surface of the tooth surface 111 of the worm 110 Assuming that the radius of 111a is r3
Radius r1 of concave surface of concave holding portion 121a> radius r2 of outer periphery of ball 123
Radius r3 of concave curved surface 111a of tooth surface 111 of worm 110> radius r2 of outer periphery of ball 123
It is comprised so that the relationship of may be materialized.
　これにより、ウォーム１１０の歯面１１１の凹状の曲面１１１ａとボール１２３の外周面１２３ａとが点接触ではなくて線接触または面接触となるとともに、ボール１２３の外周面１２３ａと凹状保持部１２１ａとが点接触ではなくて線接触または面接触となるため、ボール１２３がウォーム１１０から受ける力のうちウォームホイール回転方向下流側へ作用する力を効率よく受け止めることができ、さらに、凹状保持部１２１ａがボール１２３から受ける力のうちウォームホイール回転方向下流側へ作用する力を受け止めることができる。 As a result, the concave curved surface 111a of the tooth surface 111 of the worm 110 and the outer peripheral surface 123a of the ball 123 are not point contact but line contact or surface contact, and the outer peripheral surface 123a of the ball 123 and the concave holding portion 121a are Since not a point contact but a line contact or a surface contact, it is possible to efficiently receive the force acting on the downstream side of the worm wheel rotation direction among the forces received by the ball 123 from the worm 110. Furthermore, the concave holding portion 121a is a ball Among the forces received from 123, the force acting on the downstream side in the rotational direction of the worm wheel can be received.
　なお、図５Ａに示すように、凹状保持部１２１ａの凹状曲面が、縦Ｄｖと横Ｄｈとの比が同じとなるボール１２３（真円球）に対応する凹曲面でもよいし、図５Ｂに示すように、凹状保持部１２１ａの凹状曲面が、縦Ｄｖが横Ｄｈより大となるボール１２３（楕円球）に対応する凹曲面でもよいし、図５Ｃに示すように、凹状保持部１２１ａの凹状曲面が、縦Ｄｖが横Ｄｈより小となるボール１２３（楕円球）に対応する凹曲面でもよい。
　図５Ｂおよび図５Ｃに示すように縦Ｄｖと横Ｄｈとの比が同じでない場合は凹状保持部１２１ａの凹曲面の曲率Ｒ１（半径ｒ１）は、一定ではなく凹曲面の箇所に応じて変化する。 As shown in FIG. 5A, the concave curved surface of the concave holding portion 121a may be a concave curved surface corresponding to a ball 123 (a perfect round sphere) having the same ratio of vertical Dv and horizontal Dh, as shown in FIG. 5B. Thus, the concave curved surface of the concave holding portion 121a may be a concave curved surface corresponding to the ball 123 (elliptic sphere) in which the vertical Dv is larger than the horizontal Dh, or as shown in FIG. 5C, the concave curved surface of the concave holding portion 121a. However, it may be a concave surface corresponding to a ball 123 (elliptic sphere) in which the vertical Dv is smaller than the horizontal Dh.
As shown in FIGS. 5B and 5C, when the ratio between the vertical Dv and the horizontal Dh is not the same, the curvature R1 (radius r1) of the concave surface of the concave holding portion 121a is not constant but changes according to the concave surface. .
　また、本実施例では、ウォーム１１０からボール１２３を介してウォームホイール１２０に動力が伝達される減速機としてのウォームギア装置１００について説明したが、ウォーム１１０とウォームホイール１２０とが直接接触する構造と比べて摩擦力が十分に小さくなり所謂セルフロックにならないため、ウォームホイール１２０からボール１２３を介してウォーム１１０に動力が伝達される増速機としてのウォームギア装置１００でもよい。 Further, although the worm gear device 100 as a reduction gear in which power is transmitted from the worm 110 to the worm wheel 120 via the ball 123 has been described in the present embodiment, the structure is compared with a structure in which the worm 110 and the worm wheel 120 directly contact. Therefore, the worm gear device 100 may be a speed increasing device in which the power is transmitted from the worm wheel 120 to the worm 110 via the ball 123 because the frictional force is sufficiently reduced and the so-called self-lock does not occur.
　このようにして得られた第１実施例であるウォームギア装置１００は、ウォームホイール１２０が、ウォームホイール回転軸方向に重ね合わせた一対の円盤状部材である第１円盤状部材１２１および第２円盤状部材１２２と、ウォーム１１０と接触する複数のボール１２３、１２３…とからなるとともに、この第１円盤状部材１２１および第２円盤状部材１２２のそれぞれの外周に等間隔で配設した複数の凹状保持部１２１ａ、１２１ａ…、１２２ａ、１２２ａ…が、複数のボール１２３、１２３…をウォームホイール回転軸方向で対となって回転自在にそれぞれ保持していることにより、ウォーム（１１０）とウォームホイール（１２０）とが直接接触する構造と比べて摩擦力を十分に小さくして力の伝達効率を高くすることができるとともに、簡単な構造で確実にボール１２３を回転自在に保持できる。 In the worm gear device 100 according to the first embodiment thus obtained, the worm wheel 120 is a first disc-like member 121 and a second disc-like member which are a pair of disc-like members superimposed in the direction of the worm wheel rotation axis. A plurality of concave holding members consisting of a member 122 and a plurality of balls 123 in contact with the worm 110, and arranged at equal intervals on the outer periphery of the first disk-shaped member 121 and the second disk-shaped member 122 The parts 121a, 121a, ... 122a, 122a, ... are held rotatably as a pair of balls 123, 123 ... in pairs in the direction of the rotational axis of the worm wheel, whereby the worm (110) and the worm wheel (120 And the force transmission efficiency can be increased by sufficiently reducing the friction force compared to the structure in which the Moni, can be reliably rotatably held balls 123 with a simple structure.
　さらに、凹状保持部１２１ａ（１２２ａ）が、ウォームホイール１２０の外周に形成した歯形の先端１２１ｂよりウォームホイール中心側に配設されていることにより、ウォームホイール１２０の回転に伴う遠心力に対抗してボール１２３の脱落を防止できる。
　また、ボール１２３の外周面１２３ａの一部が、ウォームホイール１２０の歯面１２１ｃから突出していることにより、簡単な構造でボール１２３をウォーム１１０と接触させることができるとともにウォームホイール１２０の円盤状部材がウォーム１１０と接触することを防止できる。 Furthermore, the concave holding portion 121a (122a) is disposed on the worm wheel center side with respect to the end 121b of the tooth shape formed on the outer periphery of the worm wheel 120, so that the centrifugal force accompanying the rotation of the worm wheel 120 is counteracted. Falling of the ball 123 can be prevented.
Further, since a part of the outer peripheral surface 123a of the ball 123 protrudes from the tooth surface 121c of the worm wheel 120, the ball 123 can be brought into contact with the worm 110 with a simple structure and the disk shaped member of the worm wheel 120 Can be prevented from coming into contact with the worm 110.
　さらに、凹状保持部１２１ａ（１２２ａ）が、ボール１２３と点接触または線接触する凸部（図示せず）を有していることにより、ボール１２３の回転をスムーズにすることができるとともに油切れを防止できるなど、その効果は甚大である。 Furthermore, since the concave holding portion 121a (122a) has a convex portion (not shown) in point contact or line contact with the ball 123, the rotation of the ball 123 can be made smooth and oil breakage is caused. Its effect is enormous, as it can be prevented.
　続いて、本発明の第２実施例であるウォームギア装置２００について、図６に基づいて説明する。 Subsequently, a worm gear device 200 according to a second embodiment of the present invention will be described based on FIG.
　第２実施例のウォームギア装置２００は、第１実施例のウォームギア装置１００のウォーム１１０の歯面１１１の曲率Ｒ３とボール１２３の曲率Ｒ２との関係でウォーム１１０の歯面１１１の曲率Ｒ３をボール１２３の曲率Ｒ２より大としたものであり、多くの要素について第１実施例のウォームギア装置１００と共通するので、共通する事項については詳しい説明を省略し、下２桁が共通する２００番台の符号を付すのみとする。 In the worm gear device 200 of the second embodiment, the curvature R3 of the tooth surface 111 of the worm 110 is changed to the ball 123 by the relationship between the curvature R3 of the tooth surface 111 of the worm 110 and the curvature R2 of the ball 123 of the worm gear device 100 of the first embodiment. The curvature G2 is larger than the curvature R2 of the above, and many elements are common to the worm gear device 100 of the first embodiment. It is only attached.
　本発明の第２実施例であるウォームギア装置２００は、図６に示すように、ウォーム２１０と、ウォーム回転軸方向に対して交差する方向をウォームホイール回転軸方向とするウォームホイール２２０とを有している。
　さらに、ウォームホイール２２０が、ウォームホイール回転軸方向に重ね合わせた一対の円盤状部材である第１円盤状部材２２１および第２円盤状部材（図示せず）と、ウォーム２１０と接触する複数のボール２２３、２２３…とからなるとともに、この第１円盤状部材２２１および第２円盤状部材（図示せず）のそれぞれの外周に等間隔で配設した複数の凹状保持部２２１ａ、２２１ａ…（第２円盤状部材側の説明は省略）が、複数のボール２２３、２２３…をウォームホイール回転軸方向で対となって回転自在にそれぞれ保持している。 As shown in FIG. 6, the worm gear device 200 according to the second embodiment of the present invention includes a worm 210 and a worm wheel 220 whose direction intersecting with the worm rotational axis direction is the worm wheel rotational axis direction. ing.
Furthermore, a plurality of balls in contact with the worm 210 are a first disc-like member 221 and a second disc-like member (not shown), which are a pair of disc-like members in which the worm wheel 220 is superimposed in the worm wheel rotational axis direction. And a plurality of concave holding portions 221a, 221a... (Second ones) arranged at equal intervals on the outer periphery of the first disk-shaped member 221 and the second disk-shaped member (not shown). The description of the disc-like member side is omitted) holds the plurality of balls 223, 223, ... in pairs in the direction of the worm wheel rotation axis so as to be freely rotatable.
　ウォーム２１０の歯面２１１の一部が、ボール２２３に対して凹状の曲面２１１ａで形成されているとともに、この凹状の曲面２１１ａの曲率Ｒ３が、ボール２２３の外周面２２３ａの曲率Ｒ２より大きく設けられている。
　曲率の逆数が半径（曲率半径）であることから、言い換えると、凹状の曲面２１１ａの半径ｒ３が、ボール２２３の外周の半径ｒ２より小さく設けられている。
　これにより、ボール２２３がウォーム２１０の歯面２１１と複数の箇所Ｔ１、Ｔ２で点接触する。 A part of the tooth surface 211 of the worm 210 is formed of a concave curved surface 211a with respect to the ball 223, and the curvature R3 of the concave curved surface 211a is provided larger than the curvature R2 of the outer peripheral surface 223a of the ball 223 ing.
Since the reciprocal of curvature is the radius (curvature radius), in other words, the radius r3 of the concave curved surface 211a is smaller than the radius r2 of the outer periphery of the ball 223.
Thereby, the ball 223 is in point contact with the tooth surface 211 of the worm 210 at a plurality of points T1 and T2.
　なお、凹状の曲面２１１ａが、断面が楕円の一部となる曲面であり、この曲面の一部の曲率Ｒ３がボール２２３の曲率Ｒ２より大きく設けられていることにより、ボール２２３がウォーム２１０の歯面２１１と複数の箇所Ｔ１、Ｔ２で点接触してもよい。
　つまり、ウォーム２１０の歯面２１１の凹状の曲面２１１ａにおけるボール２２３と二箇所Ｔ１、Ｔ２で点接触している間の曲率Ｒ３は自由に決めてよい。 The concave curved surface 211a is a curved surface whose section is a part of an ellipse, and the curvature R3 of a part of the curved surface is set to be larger than the curvature R2 of the ball 223. The surface 211 may be in point contact with a plurality of points T1 and T2.
That is, the curvature R3 of the concave curved surface 211a of the tooth surface 211 of the worm 210 while in point contact with the ball 223 at two points T1 and T2 may be freely determined.
　このようにして得られた第２実施例であるウォームギア装置２００は、ウォーム２１０の歯面２１１の一部が、ボール２２３に対して凹状の曲面２１１ａで形成されているとともに、この凹状の曲面２１１ａの曲率Ｒ３が、ボール２２３の外周面２２３ａの曲率Ｒ２より大きく設けられていることにより、歯面２１１からボール２２３に作用する圧力を分散して面圧を抑えることができるなど、その効果は甚大である。 In the worm gear device 200 according to the second embodiment obtained in this manner, a part of the tooth surface 211 of the worm 210 is formed with a curved surface 211 a concave to the ball 223, and the concave curved surface 211 a The effect of the invention is remarkable, such as that the pressure acting on the ball 223 from the tooth surface 211 can be dispersed and the surface pressure can be suppressed by providing the curvature R3 of the ball to be larger than the curvature R2 of the outer peripheral surface 223a of the ball 223 It is.
１００、　２００　　・・・　ウォームギア装置
１１０、　２１０　　・・・　ウォーム
１１１、　２１１　　・・・　歯面
１１１ａ、２１１ａ　・・・　凹状の曲面
１１２、　２１２　　・・・　歯底部
１２０、　２２０　　・・・　ウォームホイール
１２１、　２２１　　・・・　第１円盤状部材
１２１ａ、２２１ａ　・・・　凹状保持部
１２１ｂ、２２１ｂ　・・・　歯形の先端
１２１ｃ、２２１ｃ　・・・　歯面
１２２　　　　　　　・・・　第２円盤状部材
１２２ａ　　　　　　・・・　凹状保持部
１２３、　２２３　　・・・　ボール
１２３ａ、２２３ａ　・・・　外周面
Ｒ１　　　　　　　　・・・　（凹状保持部の凹曲面の）曲率
Ｒ２　　　　　　　　・・・　（ボールの外周面の）曲率
Ｒ３　　　　　　　　・・・　（ウォームの歯面の凹状の曲面の）曲率
ｒ１　　　　　　　　・・・　（凹状保持部の凹曲面の）半径
ｒ２　　　　　　　　・・・　（ボールの外周面の）半径
ｒ３　　　　　　　　・・・　（ウォームの歯面の凹状の曲面の）半径 100, 200 · · · Worm gear device 110, 210 · · · Worm 111, 211 · · · Tooth surface 111a, 211a · · · Concave curved surface 112, 212 · · · · · · · · · · · · · · · Worm wheel 121, 221 · · · 1st discoid member 121a, 221a · · · concave holding portion 121b, 221b ··· tip of tooth shape 121c, 221c ··· tooth surface 122 · · · second disk shaped member 122a · · · concave holding Portions 123, 223 · · · Balls 123a, 223a · · · · Outer peripheral surface R 1 · · · (of the concave surface of the concave holding portion) curvature · · · · (curvature of the outer surface of the ball) · · · (Warm teeth Curvature r1 of the concave curved surface of the surface · · · · · radius r 2 (of the concave curved surface of the concave holding portion) · · · (periphery of the ball Of) radius r3 ··· (of the concave curved surface of the worm tooth surface) radius

Claims (5)

  1. 　ウォームと、ウォーム回転軸方向に対して交差する方向をウォームホイール回転軸方向とするウォームホイールとを有してウォームおよびウォームホイールの一方から他方へ動力を伝達するウォームギア装置において、
    　前記ウォームホイールが、前記ウォームホイール回転軸方向に重ね合わせた一対の円盤状部材と、ウォームと接触する複数のボールとからなるとともに、該一対の円盤状部材のそれぞれの外周に等間隔で配設した複数の凹状保持部が、前記複数のボールをウォームホイール回転軸方向で対となって回転自在にそれぞれ保持していることを特徴とするウォームギア装置。     A worm gear device having a worm and a worm wheel having a direction intersecting the worm rotational axis direction as a worm wheel rotational axis direction to transmit power from one of the worm and the worm wheel to the other,
    The worm wheel is composed of a pair of disc-like members superimposed in the direction of the worm wheel rotation axis, and a plurality of balls in contact with a worm, and disposed at equal intervals on the outer circumferences of the pair of disc-like members A worm gear device characterized in that the plurality of concave holding portions rotatably hold the plurality of balls in pairs in the direction of the worm wheel rotation axis.
  2. 　前記凹状保持部が、前記ウォームホイールの外周に形成した歯形の先端よりウォームホイール中心側に配設されていることを特徴とする請求項１に記載のウォームギア装置。 The worm gear device according to claim 1, wherein the concave holding portion is disposed closer to the center of the worm wheel than a tip end of a tooth profile formed on the outer periphery of the worm wheel.
  3. 　前記ウォームの歯面の一部が、前記ボールに対して凹状の曲面で形成されているとともに、該凹状の曲面の曲率が、前記ボールの外周面の曲率より大きく設けられていることを特徴とする請求項１に記載のウォームギア装置。 A part of the tooth surface of the worm is formed as a concave curved surface with respect to the ball, and the curvature of the concave curved surface is provided larger than the curvature of the outer peripheral surface of the ball. The worm gear device according to claim 1.
  4. 　前記ボールの外周面の一部が、前記ウォームホイールの歯面から突出していることを特徴とする請求項１に記載のウォームギア装置。 The worm gear device according to claim 1, wherein a part of the outer circumferential surface of the ball protrudes from a tooth surface of the worm wheel.
  5. 　前記凹状保持部が、前記ボールと点接触または線接触する凸部を有していることを特徴とする請求項１に記載のウォームギア装置。 The worm gear device according to claim 1, wherein the concave holding portion has a convex portion that makes point contact or line contact with the ball.
PCT/JP2013/055713 2012-03-23 2013-03-01 Worm gear device WO2013141002A1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2015202820B1 (en) * 2015-03-09 2015-09-24 Nord-Lock Australia Pty Ltd A high torque transmission
CN105889418A (en) * 2014-12-08 2016-08-24 吴小杰 Hollow type zero-return-difference worm speed reducer of industrial robot
CN115306882A (en) * 2022-10-08 2022-11-08 常州恩慧金属新材料有限公司 Gear structure of speed reducing motor capable of reducing abrasion

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113175500B (en) * 2021-05-18 2022-04-08 成都理工大学 Ball roller worm gear and worm transmission device and system
CN113153980B (en) * 2021-05-18 2022-04-08 成都理工大学 Split type worm and drive mechanism thereof
CN113153981B (en) * 2021-05-18 2022-04-08 成都理工大学 Worm and worm gear transmission device with zero clearance
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60137262U (en) * 1984-12-25 1985-09-11 根本企画工業株式会社 power transmission device
JPH05302649A (en) * 1992-04-28 1993-11-16 Kamo Seiko Kk Worm speed reducer
JP2005247011A (en) * 2004-03-01 2005-09-15 Koyo Seiko Co Ltd Electric power steering gear

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60137262U (en) * 1984-12-25 1985-09-11 根本企画工業株式会社 power transmission device
JPH05302649A (en) * 1992-04-28 1993-11-16 Kamo Seiko Kk Worm speed reducer
JP2005247011A (en) * 2004-03-01 2005-09-15 Koyo Seiko Co Ltd Electric power steering gear

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105889418A (en) * 2014-12-08 2016-08-24 吴小杰 Hollow type zero-return-difference worm speed reducer of industrial robot
AU2015202820B1 (en) * 2015-03-09 2015-09-24 Nord-Lock Australia Pty Ltd A high torque transmission
WO2016141407A1 (en) 2015-03-09 2016-09-15 Nord-Lock Australia Pty Ltd An improved high torque transmission
CN107429797A (en) * 2015-03-09 2017-12-01 洛帝牢澳大利亚私人有限公司 Improved high torque transmission device
KR20170134417A (en) * 2015-03-09 2017-12-06 노르드락 오스트레일리아 피티와이 엘티디 An Improved High Torque Transmission
EP3268632A4 (en) * 2015-03-09 2018-10-10 Nord-Lock Australia Pty Ltd An improved high torque transmission
US10598254B2 (en) 2015-03-09 2020-03-24 Nord-Lock Australia Pty Ltd High torque transmission
KR102503654B1 (en) * 2015-03-09 2023-02-23 노르드락 오스트레일리아 피티와이 엘티디 An Improved High Torque Transmission
CN115306882A (en) * 2022-10-08 2022-11-08 常州恩慧金属新材料有限公司 Gear structure of speed reducing motor capable of reducing abrasion

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