WO2020013733A1 - Vis à rouleaux satellites pour transmission excentrique vis-écrou - Google Patents

Vis à rouleaux satellites pour transmission excentrique vis-écrou Download PDF

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Publication number
WO2020013733A1
WO2020013733A1 PCT/RU2019/050074 RU2019050074W WO2020013733A1 WO 2020013733 A1 WO2020013733 A1 WO 2020013733A1 RU 2019050074 W RU2019050074 W RU 2019050074W WO 2020013733 A1 WO2020013733 A1 WO 2020013733A1
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WO
WIPO (PCT)
Prior art keywords
screw
nut
eccentric
thread
pair
Prior art date
Application number
PCT/RU2019/050074
Other languages
English (en)
Russian (ru)
Inventor
Виктор СТАНОВСКОЙ
Сергей КАЗАКЯВИЧЮС
Алексей ПОПОВ
Олег ЦЫГАНОВ
Александр СТАНОВСКОЙ
Original Assignee
Виктор СТАНОВСКОЙ
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 Виктор СТАНОВСКОЙ filed Critical Виктор СТАНОВСКОЙ
Publication of WO2020013733A1 publication Critical patent/WO2020013733A1/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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B33/00—Features common to bolt and nut

Definitions

  • the invention relates to planetary helical gears that convert rotational motion into translational, and can be used in linear drives, especially in mechanisms where precise movement and positioning is required, such as precision metal cutting machines, guidance mechanisms of optical and other devices, gun shafts, actuators of adjustable valves and valves, etc.
  • screw-nut gears are most widely used.
  • the screw-nut transmission in the most general case contains two links: a screw and a nut in contact with screw surfaces (AF Krainev Dictionary - a reference to mechanisms, M. Engineering, 1987, p. 49).
  • such a mechanism has insufficient positioning accuracy for a number of applications, since the linear displacement step depends (is equal to?) On the thread pitch. A decrease in the thread pitch is limited by a decrease in the bearing capacity of the transmission.
  • the accuracy of the positioning of the screw-nut gear in RU2339858 is increased by the use of a preliminary gear pair.
  • two screw-nut gears with different pitch and thread direction are used, connected with a pair of gears of external gearing.
  • the dimensions, weight and complexity of the design of the mechanism are significantly increased.
  • Known planetary misaligned (eccentric) screw-nut transmission (see ibid., P. 288, scheme a), or SU 1350420), the screw pair of which we choose for the prototype.
  • the screw and nut of the screw pair of this gear have different diameters of the screw thread.
  • the axes of the screw and nut are offset by a distance using an eccentric and parallel to each other.
  • One of the axes by means of an eccentric rotates relative to the other.
  • the movement is carried out by rolling the turns of the nut on the turns of the screw or turns of the screw on the turns of the nut.
  • SU 1350420 describes a transmission in which a nut is rotatably disposed in a housing with an eccentric sleeve.
  • the rotation of the eccentric rotates the axis of the nut around the axis of the screw, and the interaction of the thread of the screw with the thread of the nut leads to precise axial movement of the screw.
  • the linear displacement step is determined by the difference in the lengths of the contacting lines, which can be quite small.
  • a reverse circuit of such a transmission is also possible, when the input link can be a screw mounted on an internal eccentric, and the output, linearly moving link, then there will be a nut.
  • reduction and, consequently, positioning accuracy are increased.
  • a disadvantage arises due to the possibility of slipping of the screw thread along the nut thread, which leads to malfunctions in its operation.
  • the technical result of the invention is the elimination of slippage in a screw pair, and, consequently, increase the efficiency of the transmission. Additional technical results achieved by individual variants of the invention are to reduce the linear step of the mechanism, and, therefore, increase the accuracy of positioning, as well as eliminate imbalance.
  • a screw pair for an eccentric screw-nut transmission contains a screw and a nut with a screw thread of different diameters.
  • the axis of the screw and nut are parallel offset from each other using an internal or external eccentric and are able to rotate one relative to the other.
  • part or all of the surface of one of the parts in a screw pair is made with a cylindrical gear profile mating with a gear profile made on a screw threaded surface of another part in a pair.
  • this profile can be performed both on a screw threaded surface and separately, in the vicinity of the thread.
  • the screw-nut cylindrical gear profile on both parts is advisable to make helical.
  • the above pairs due to the eccentrics have an imbalance of masses that limits the speed of rotation of the transmission, and also serves as a source of additional loads on bearings and other parts.
  • several screw pairs are connected in series with eccentrics connected to each other, which are symmetrically oriented around the circumference relative to the axis of the screw pair.
  • the second parts of all pairs are made in one piece, as a single part.
  • FIG. 1 shows a longitudinal section through a helical gear with an internal clown
  • FIG. 2 is a cross-section along B-B of this screw pair
  • FIG. 3 shows a longitudinal section through a helical gear with an external clown
  • FIG. 4 shows a longitudinal section of a screw-nut transmission based on the serial connection of two screw pairs, designed to eliminate imbalance.
  • Figure 5 is a General view of this transmission with a partial section.
  • FIG. 6 shows a longitudinal section of a gear with an external eccentric and with a helical gear profile on the details of a screw pair. All screw drives shown in the figures are differential, in them the eccentric is an input rotating link, and the output can be either a screw or a nut, depending on which of these links we make stationary (stand).
  • Screw 1 is mounted on the eccentric 3 of the shaft 4 on the bearing 5. This fit shifts the axis 01-01 of the screw 1 from the axis 0-0 of the nut 2 to the eccentricity e. Screw 1 has the possibility of free rotation relative to the eccentric 3 on the bearing 5.
  • the nut 2 is firmly connected to the end flanges 6 and 7, in which the shaft 4 is mounted on the bearings. Due to this, the nut 2 and the shaft 4 can freely rotate relative to each other. In the axial direction, screw 1 can be moved relative to nut 2 only together with the eccentric 3 and the shaft 4 rigidly connected to it due to the thrust rings 8 and flanges 9.
  • Screw threads 10 and 11 are made on the surfaces of the screw 1 and nut 2 facing each other.
  • the thread 11 on the nut 2 is made along its entire length, and the thread 10 is cut only at the two ends of the screw 1.
  • the inner gear cylindrical profile 12 is cut.
  • the external gear profile 13 mating with it is located on the screw 1 in the center of the screw its length between ezbovymi sections 10.
  • the screw pair in FIG. 3 also has a screw 1 and a nut 2, the axes of which are offset from each other.
  • the screw 1 is rigidly connected to the shaft 4, and the nut 2 is seated in a cylindrical housing 14 on the inner eccentric section 15 using the bearing 16.
  • Screw 1 and the nut 2 has mating screw threads 10 and 11, and the thread 11 is cut only at the end sections of the nut 2.
  • the nut 2 in the axial direction can only move with respect to the shaft 4 together with the housing 14, since it is fixed by the retaining rings 8 and flanges 9 on the corresponding parts.
  • the shaft 4 is seated in the housing 14 also on bearings. On the inner surface of the nut 2 in its center between the sections of the thread 11, a cylindrical gear profile 13 is cut, mating with an external gear profile 12 cut over the thread 10 of the screw 1.
  • two eccentrics 17 and 18 are arranged in series, having opposite eccentricity, i.e., the eccentrics are oriented symmetrically with respect to the transmission axis.
  • the symmetric orientation of the eccentrics will be achieved by turning them relative to each other by 120 degrees.
  • a screw 20 of the first screw pair is set.
  • a screw 22 of the second screw pair is set.
  • the nuts of both screw pairs are connected together and are made as a single part 23.
  • a cylindrical gear profile 25 is made on the inner surface of the nut 23, in addition to the screw thread 11, a cylindrical gear profile 25 is made.
  • screw threads 26 and 27 are located at the edges, and in the middle sections of the screws cylindrical gear profiles 28 and 29 are cut.
  • the screws 20 and 22 are fixed axially relative to the eccentrics 17 and 18 with retaining rings and collars, which are not indicated for clarity of reading of the drawings.
  • the nut 23 is rigidly connected with the end flanges 6 and 7, in which the shaft 4 is mounted on the bearings.
  • Such screw pairs like the prototype, have a small linear step, allowing them to be used in precise positioning mechanisms. However, it is possible to further reduce the linear pitch down to 0.01 mm / rev.
  • Such a helical gear with two screw pairs is shown in Fig.6.
  • the cylindrical gear profile 28 on the inner surface of the joint nut 23 is helical.
  • the external gear profiles 31 and 32 in the sections in the middle of the screws 20 and 22 are also made with bevel teeth. All other designations in this figure are the same as in figures 4 and 5.
  • the slipping in the proposed screw pair will be prevented by the interaction of the teeth of the cylindrical gear profile 13 on the screw 1 and the gear profile 12 on the nut 2, which form a planetary eccentric gear with a stable gear ratio.
  • the axial displacement step will become stable and will be clearly determined by the ratio of the number of teeth of the profiles 13 and 12 on the screw 1 and nut 2. It is advisable to choose the number of teeth so that the gear ratio of the planetary gear transmission is equal to the gear ratio of the planetary helical pair. In real conditions, when using standard threads and standard gear profiles, it is not always possible to achieve exact equality. But in any case, it is desirable that these gear ratios be as close as possible to each other.
  • the linear displacement step will be slightly larger, or slightly less than the step determined only by a screw thread, but at the same time stable.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

L'invention, qui concerne une vis à rouleaux satellites pour transmission excentrique vis-écrou, se rapporte aux transmissions planétaires à vis qui convertissent un mouvement rotatif en mouvement de va-et-vient, et peut être utilisée dans des actionneurs linéaires, notamment dans des mécanismes nécessitant un déplacement et un positionnement précis, comme dans les métiers de découpe de métaux de précision, des mécanismes de pointage d'appareils optiques et autres, des actionneurs de vannes de régulation et de clapets, etc. Cette vis à rouleaux satellites comprend un écrou (23) avec un filetage hélicoïdal (11) et une vis (20) avec un filetage hélicoidal (26) d'un diamètre inférieur au filetage hélicoïdal (11) de l'écrou. La vis (20) est placée sur un excentrique (7) d'un arbre d'entrée (4). Dans un tel assemblage, les axes de la vis et de l'écrou sont décalés l'un par rapport à l'autre et peuvent tourner l'un par rapport à l'autre. Une partie de surface de la vis (20) possède un profil denté cylindrique (28) qui s'engrène avec le profil denté (25) formé sur la surface filetée de l'écrou (23). Afin d'éliminer un déséquilibre, l'arbre (4) comporte un second excentrique opposé à l'excentrique (17). Sur cet excentrique vient se loger une seconde vis (22) capable de rotation et possédant un filetage hélicoïdal (27). Cette vis comporte également un profil denté cylindrique (29) qui s'engrène avec ledit profil denté (25) formé sur le filetage de l'écrou (25). Ce mode de réalisation de vis à rouleaux satellites élimine toute possibilité de glissement des spires du filetage , ce qui stabilise le pas de déplacement axial de la transmission.
PCT/RU2019/050074 2018-07-13 2019-06-03 Vis à rouleaux satellites pour transmission excentrique vis-écrou WO2020013733A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2018126056 2018-07-13
RU2018126056A RU2695742C1 (ru) 2018-07-13 2018-07-13 Винтовая пара для эксцентриковой передачи винт-гайка

Publications (1)

Publication Number Publication Date
WO2020013733A1 true WO2020013733A1 (fr) 2020-01-16

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PCT/RU2019/050074 WO2020013733A1 (fr) 2018-07-13 2019-06-03 Vis à rouleaux satellites pour transmission excentrique vis-écrou

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RU (1) RU2695742C1 (fr)
WO (1) WO2020013733A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2752356C1 (ru) * 2020-10-21 2021-07-26 Виктор Владимирович Становской Винтовая пара и планетарная передача на её основе

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4186620A (en) * 1977-03-09 1980-02-05 Roltra S.P.A. Screw-nut screw transmission coupling
SU1350420A1 (ru) * 1986-05-19 1987-11-07 Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Технологии Электромашиностроения Эксцентрична винтова передача
EA020269B1 (ru) * 2010-01-29 2014-09-30 Закрытое Акционерное Общество "Технология Маркет" Эксцентриково-циклоидальное зацепление зубчатых профилей (варианты)
RU2570846C2 (ru) * 2014-02-28 2015-12-10 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный университет информационных технологий, радиотехники и электроники" Винтовая передача

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU130651U1 (ru) * 2013-02-27 2013-07-27 Российская Федерация, От Имени Которой Выступает Министерство Промышленности И Торговли Российской Федерации Роликовинтовой планетарный механизм

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4186620A (en) * 1977-03-09 1980-02-05 Roltra S.P.A. Screw-nut screw transmission coupling
SU1350420A1 (ru) * 1986-05-19 1987-11-07 Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Технологии Электромашиностроения Эксцентрична винтова передача
EA020269B1 (ru) * 2010-01-29 2014-09-30 Закрытое Акционерное Общество "Технология Маркет" Эксцентриково-циклоидальное зацепление зубчатых профилей (варианты)
RU2570846C2 (ru) * 2014-02-28 2015-12-10 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный университет информационных технологий, радиотехники и электроники" Винтовая передача

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