WO2013141002A1 - Dispositif de roue à vis sans fin - Google Patents

Dispositif de roue à vis sans fin 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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WO
WIPO (PCT)
Prior art keywords
worm
worm wheel
ball
gear device
concave
Prior art date
Application number
PCT/JP2013/055713
Other languages
English (en)
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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/fr

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Classifications

    • 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

L'invention concerne un dispositif de roue à vis sans fin pour maintenir fermement en rotation des billes par l'utilisation de manière adéquate d'un faible frottement et d'une construction simple. Un dispositif de roue à vis sans fin (100) est caractérisé en ce qu'une roue de vis sans fin (120) comprend une paire d'éléments annulaires (121, 122) joints l'un à l'autre dans la direction axiale de la roue de vis sans fin, et une pluralité de billes (123, 123 ...) pour établir un contact avec une vis sans fin (110), et une pluralité de parties de maintien concaves (121a, 121a ..., 122a, 122a ...) logées à des intervalles identiques dans les périphéries extérieures de la paire d'éléments annulaires (121, 122) forment des paires dans la direction axiale de la roue de vis sans fin pour maintenir en rotation la pluralité de billes (123, 123 ...).
PCT/JP2013/055713 2012-03-23 2013-03-01 Dispositif de roue à vis sans fin WO2013141002A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012067924 2012-03-23
JP2012-067924 2012-03-23

Publications (1)

Publication Number Publication Date
WO2013141002A1 true WO2013141002A1 (fr) 2013-09-26

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PCT/JP2013/055713 WO2013141002A1 (fr) 2012-03-23 2013-03-01 Dispositif de roue à vis sans fin

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WO (1) WO2013141002A1 (fr)

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 (zh) * 2014-12-08 2016-08-24 吴小杰 工业机器人中空型零回差蜗轮减速器
CN115306882A (zh) * 2022-10-08 2022-11-08 常州恩慧金属新材料有限公司 一种可减少磨损的减速电机齿轮结构

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113153980B (zh) * 2021-05-18 2022-04-08 成都理工大学 一种分体式蜗杆及其传动机构
CN113175500B (zh) * 2021-05-18 2022-04-08 成都理工大学 一种球滚子蜗轮蜗杆传动装置及系统
CN113153981B (zh) * 2021-05-18 2022-04-08 成都理工大学 一种具有无间隙蜗杆蜗轮传动装置
CN113175499B (zh) * 2021-05-18 2022-04-08 成都理工大学 一种具有球形滚子的蜗轮及其传动机构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60137262U (ja) * 1984-12-25 1985-09-11 根本企画工業株式会社 動力伝達装置
JPH05302649A (ja) * 1992-04-28 1993-11-16 Kamo Seiko Kk ウォーム減速機
JP2005247011A (ja) * 2004-03-01 2005-09-15 Koyo Seiko Co Ltd 電動パワーステアリング装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60137262U (ja) * 1984-12-25 1985-09-11 根本企画工業株式会社 動力伝達装置
JPH05302649A (ja) * 1992-04-28 1993-11-16 Kamo Seiko Kk ウォーム減速機
JP2005247011A (ja) * 2004-03-01 2005-09-15 Koyo Seiko Co Ltd 電動パワーステアリング装置

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105889418A (zh) * 2014-12-08 2016-08-24 吴小杰 工业机器人中空型零回差蜗轮减速器
AU2015202820B1 (en) * 2015-03-09 2015-09-24 Nord-Lock Australia Pty Ltd A high torque transmission
WO2016141407A1 (fr) 2015-03-09 2016-09-15 Nord-Lock Australia Pty Ltd Transmission à couple élevé améliorée
CN107429797A (zh) * 2015-03-09 2017-12-01 洛帝牢澳大利亚私人有限公司 改进的高扭矩传动装置
KR20170134417A (ko) * 2015-03-09 2017-12-06 노르드락 오스트레일리아 피티와이 엘티디 개선된 고토크 트랜스미션
EP3268632A4 (fr) * 2015-03-09 2018-10-10 Nord-Lock Australia Pty Ltd Transmission à couple élevé améliorée
US10598254B2 (en) 2015-03-09 2020-03-24 Nord-Lock Australia Pty Ltd High torque transmission
KR102503654B1 (ko) * 2015-03-09 2023-02-23 노르드락 오스트레일리아 피티와이 엘티디 개선된 고토크 트랜스미션
CN115306882A (zh) * 2022-10-08 2022-11-08 常州恩慧金属新材料有限公司 一种可减少磨损的减速电机齿轮结构

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