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WO2018180184A1 - Engrenage en résine et mécanisme d'engrenage - Google Patents

Engrenage en résine et mécanisme d'engrenage Download PDF

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Publication number
WO2018180184A1
WO2018180184A1 PCT/JP2018/007890 JP2018007890W WO2018180184A1 WO 2018180184 A1 WO2018180184 A1 WO 2018180184A1 JP 2018007890 W JP2018007890 W JP 2018007890W WO 2018180184 A1 WO2018180184 A1 WO 2018180184A1
Authority
WO
WIPO (PCT)
Prior art keywords
gear
resin
carbon
external gear
hole
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2018/007890
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English (en)
Japanese (ja)
Inventor
清水　猛
小川　隆雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Corp
Original Assignee
Nidec Corp
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 Nidec Corp filed Critical Nidec Corp
Priority to CN201880018136.1A priority Critical patent/CN110418911A/zh
Priority to JP2019509047A priority patent/JPWO2018180184A1/ja
Publication of WO2018180184A1 publication Critical patent/WO2018180184A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
    • F16H1/32—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
    • 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
    • F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties

Definitions

  • the present invention relates to a resin gear and a gear mechanism.
  • one aspect of the present invention includes a resin gear that has sufficient durability and wear resistance and good lubricity even when it is small, and includes a reinforcing fiber. Another object is to provide a gear mechanism.
  • One aspect of the resin gear of the present invention is made of a mixed material of a resin material and a carbon material, and the carbon material is spherical amorphous carbon.
  • FIG. The figure which shows the structure of a part of small reduction gear 100 which applied the resin gear of embodiment as the external gear 20.
  • FIG. The figure which shows the external gear 20.
  • FIG. The figure which shows the internal gear 10.
  • FIG. The enlarged view which shows a part of inner peripheral surface 24a of the shaft insertion hole 24 of the external gear 20 before use.
  • the enlarged view which shows a part of inner peripheral surface 24a of the shaft insertion hole 24 of the external gear 20 after use.
  • the resin gear according to the present invention is made of a mixed material of a resin material and a carbon material. Spherical amorphous carbon is used as the carbon material, and many spherical amorphous carbons are mixed in the resin material.
  • a resin gear can be suitably used as a gear having a sliding bearing function, such as an external gear 20 of a small reduction gear 100 as shown in FIG. *
  • an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system.
  • the Z-axis direction is a direction parallel to the axial directions of the first central axis J1 and the second central axis J2 shown in FIG.
  • the X-axis direction is a direction orthogonal to the Z-axis direction and is the left-right direction in FIG.
  • the Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and is the vertical direction in FIG. *
  • a direction parallel to the first central axis J1 and the second central axis is simply referred to as an “axial direction” and is centered on the first central axis J1 or the second central axis.
  • the radial direction is simply referred to as “radial direction”
  • the circumferential direction around the first central axis J1 or the second central axis, that is, the circumference of the first central axis J1 or the second central axis is simply referred to as “circumferential direction”.
  • FIG. 1 is a diagram showing a partial configuration of a small reducer 100 to which the resin gear according to the present invention is applied as the external gear 20.
  • the small reduction gear (gear mechanism) 100 includes at least an internal gear 10, an external gear 20, a shaft 7, and a plurality of support pins 8.
  • the shaft 7 is an input shaft of the small reduction gear 100, and a shaft main body (not shown) extending along the first central axis J1 and an eccentric portion 7B provided at the tip of the shaft main body and extending along the second central axis J2. And have. *
  • FIG. 2 is a diagram showing the external gear 20.
  • External gear (resin gear) 20 is a cycloid gear.
  • the external gear 20 has a substantially annular plate shape that extends radially from the second central axis J ⁇ b> 2.
  • a plurality of external teeth 22 projecting outward in the radial direction are provided on the outer periphery of the external gear 20.
  • an inter-external tooth groove 23 that is recessed inward in the radial direction is provided.
  • the external teeth 22 and the external inter-tooth grooves 23 exist alternately around the second central axis J2.
  • the tip diameter of the external gear 20 is, for example, 2 mm or more and 12 mm or less. *
  • the external gear 20 has a shaft insertion hole (first through hole) 24 that penetrates in the central direction in the axial direction (Z-axis direction).
  • the shaft insertion hole 24 is an axial hole that rotatably supports the eccentric portion 7B of the shaft (first shaft) 7 extending along the second central axis J2.
  • the shaft insertion hole 24 is a sliding bearing and holds the lubricating oil 19 (FIG. 6) on the inside. *
  • the external gear 20 has a plurality of through holes 25 around the shaft insertion hole 24.
  • the plurality of through-holes (second through-holes) 25 are arranged at equal intervals along the circumferential direction centering on the second central axis J2 at positions spaced radially outward from the shaft insertion hole 24. Further, the radial positions of the through holes 25 are the same. *
  • through holes 25 are provided, but the number is not limited thereto.
  • the shape of the through hole 25 viewed from the axial direction (Z-axis direction) is circular.
  • the plurality of through holes 25 are sliding bearings and hold the lubricating oil 19 (FIG. 6) inside. *
  • a support pin (second shaft) 8 shown in FIG. 1 is inserted into each of the plurality of through holes 25.
  • the inner diameter of the through hole 25 is larger than the outer diameter of the support pin 8.
  • the outer peripheral surface 8 b of the support pin 8 is in contact with the inner peripheral surface 25 a of the through hole 25.
  • the support pin 8 restricts free rotation of the external gear 20 and swings the external gear 20 around the first central axis J1.
  • the support pin 8 is connected to the output shaft of the small speed reducer 100.
  • the external gear 20 is meshed with the internal gear 10 disposed on the radially outer side. *
  • the external gear 20 is an embodiment of a resin gear according to the present invention.
  • the external gear 20 is a resin gear made of a reinforced resin containing a carbon material.
  • the resin material 11 (FIG. 4) is used as a base material, and spherical amorphous carbon is used as an additive to the base material.
  • this additive is simply referred to as spherical amorphous carbon (carbon material) 12 (FIG. 4). *
  • the resin material 11 used for the base material a polymer material having excellent moldability and high mechanical strength is selected.
  • the resin material 11 include, for example, PEEK (Poly ether ether ketone) polyether ether ketone resin (crystalline super engineering plastic), LCP (Liquid Crystal Polymer liquid crystal polymer), PPS (Poly Phenylene Sulfide Resin polyphenylene sulfide resin).
  • PEEK Poly ether ether ketone
  • LCP Liquid Crystal Polymer liquid crystal polymer
  • PPS Poly Phenylene Sulfide Resin polyphenylene sulfide resin
  • PA46 polyamide 46
  • the spherical amorphous carbon 12 is a carbon fine particle having an average aspect ratio of 2 or less.
  • the average particle diameter of the spherical amorphous carbon 12 is 5 to 10 ⁇ m.
  • the average aspect ratio means that the length in the radial direction orthogonal to the major axis direction of the spherical amorphous carbon 12 is the minor axis r ( ⁇ m), and the length of the spherical amorphous carbon 12 in the major axis direction is the major axis L ( ⁇ m). It is a value obtained by averaging the L / r ratio at the time of a plurality of particles included in a predetermined range. The aspect ratio of one particle can be calculated by observing the spherical amorphous carbon 12 and dividing the major axis of the spherical amorphous carbon 12 by the minor axis. *
  • the size of the spherical amorphous carbon 12 can be measured using an optical microscope or an electron microscope. For example, using a scanning electron microscope (SEM), for example, 100 arbitrary spherical amorphous carbons 12 are selected from the spherical amorphous carbons dispersed in the base material, and the major axis and minor axis of these spherical amorphous carbons 12 are selected. And measure. From the measured major axis and minor axis, the aspect ratio of 100 spherical amorphous carbons 12 can be obtained, and the average aspect ratio can be calculated as the average value of the aspect ratios. *
  • the finely divided spherical amorphous carbon 12 has a small aspect ratio and has a very good dispersibility with respect to the resin material 11 and is distributed in the resin material 11 in a uniform state. Further, since the aspect ratio is small, anisotropy does not appear in the dispersion direction of the spherical amorphous carbon 12 in the resin material 11, and the external gear 20 with high dimensional accuracy and high strength can be obtained.
  • spherical amorphous carbon 12 that is a carbon material (reinforcing material) is contained in the base material of the resin material. More preferably, it is 30 to 60% by volume. More preferably, it is 50%. If the content of the spherical amorphous carbon 12 is less than 20% by volume, the desired effect cannot be obtained. On the other hand, when the content of the spherical amorphous carbon 12 exceeds 70% by weight, the resin material 11 is reduced with respect to the spherical amorphous carbon 12, and the resin amount that fills the gap is insufficient. There is a risk. Therefore, by adding the spherical amorphous carbon 12 to the resin material 11 at a ratio within the above range, the external gear 20 with high dimensional accuracy can be obtained. *
  • the thermal expansion coefficient becomes lower than that of the resin material 11 alone. Therefore, the dimensional change of the external gear 20 due to heat generation during use can be suppressed.
  • FIG. 3 is a diagram showing the internal gear 10.
  • the internal gear 10 includes a cylindrical internal gear main body 10A centered on the first central axis J1, a fixed portion 10B extending from a part of the internal gear main body 10A, It consists of a single member having A plurality of internal teeth 13 projecting radially outward from the inner peripheral surface 10a is provided on the inner peripheral surface 10a of the internal gear main body 10A. Between the internal teeth 13 adjacent in the circumferential direction, an internal inter-tooth groove 14 that is recessed toward the radially inner side (inner peripheral surface 10a) is provided. The inner teeth 13 and the inter-inner teeth grooves 14 are alternately present around the first central axis J1.
  • the tip diameter of the internal gear 10 is, for example, not less than 2 mm and not more than 12 mm. *
  • the internal gear main body 10A surrounds the radially outer side of the external gear 20 as shown in FIG.
  • the internal teeth 13 of the internal gear main body 10 ⁇ / b> A face the external teeth 22 of the external gear 20 and partially mesh with each other sequentially in the circumferential direction in accordance with the swinging operation of the external gear 20.
  • the material of the internal gear 10 As the material of the internal gear 10, a polymer material having excellent moldability and high mechanical strength is selected. Specific resin materials include, for example, PEEK (Poly ether ether ketone) polyether ether ketone resin (crystalline super engineering plastic), LCP (Liquid Crystal Polymer liquid crystal polymer), PPS (Poly Phenylene Sulfide Resin polyphenylene sulfide resin), and the like. And one or more materials selected from the group consisting of polyamide resins such as semi-aromatic nylon (PA4T, PA6T, PA9T, PA10T) and polyamide 46 (PA46).
  • the internal gear 10 can be manufactured by injection molding a resin material.
  • the internal gear 10 preferably contains a carbon material.
  • the durability of the internal gear 10 can be enhanced by using a fiber-reinforced mixed material in which carbon fiber (not shown) is added to the above-described resin material as the material of the internal gear 10.
  • carbon fiber it is preferable to use a short fiber having a fiber length of 100 ⁇ m or less.
  • the same material as the base material of the internal gear 10 may be used, or may be different. *
  • the small speed reducer 100 when the shaft 7 shown in FIG. 1 rotates around the first central axis J1, the inner peripheral surface of the through-hole 25 of the external gear 20 supported by the eccentric portion of the shaft 7.
  • the external gear 20 oscillates in the radial direction while the inscribed position between 25a and the outer peripheral surface 8b of the support pin 8 changes.
  • the position where the external teeth 22 of the external gear 20 and the internal teeth 13 of the internal gear 10 mesh with each other changes in the circumferential direction.
  • the output shaft connected to the support pin 8 rotates at a speed 1/30 of the shaft 7, for example.
  • the operation of the small speed reducer 100 described above is an example, and may be configured to perform other operations. *
  • FIG. 4 is an enlarged view showing a part of the inner peripheral surface 24a of the shaft insertion hole 24 of the external gear 20 before use.
  • FIG. 5 is an enlarged view showing a part of the inner peripheral surface 24a of the shaft insertion hole 24 of the external gear 20 after use.
  • FIG. 6 is an enlarged view showing a part of the inner peripheral surface 24 a of the shaft insertion hole 24 of the external gear 20 and the shaft 7 after use. *
  • the spherical gear 12 having a hardness higher than that of the resin material 11 is added to the resin material 11 to form the external gear 20.
  • the shaft 7 rotates, friction is generated between the shaft 7 and the external gear 20, and the inner peripheral surface 24 a of the shaft insertion hole 24 of the external gear 20 is worn.
  • the external gear 20 that rotates with the rotation of the shaft 7 includes a plurality of support pins 8 inserted into the respective through holes 25 of the external gear 20. The rotation is restricted by contacting the surface 25a. Thus, the inner peripheral surface 25a of each through-hole 25 is also abraded when the support pin 8 contacts.
  • the hard spherical amorphous carbon 12 partially protrudes radially inward of the inner peripheral surfaces 24a and 25a.
  • each of the inner peripheral surface 24a of the shaft insertion hole 24 and the inner peripheral surface 25a of each through hole 25 when the resin material 11 on each surface is scraped, the hardness that is buried in the resin material 11 as shown in FIG. As shown in FIG. 5, the spherical amorphous carbon 12 appears on the surface, and a gap 15 is generated between the spherical amorphous carbon 12 and the resin material 11. Then, the lubricating oil 19 (FIG. 6) is held in the gap 15 formed in each inner peripheral surface 24a, 25a by capillary action. 4 and 5, a part of the inner peripheral surface 24a of the shaft insertion hole 24 is shown in an enlarged manner, but the inner peripheral surface 25a of the through hole 25 has a similar surface. *
  • a gap 16 is generated between the shaft 7 and the shaft insertion hole 24 by the spherical amorphous carbon 12 partially protruding inward in the radial direction of the shaft insertion hole 24.
  • the lubricating oil 19 is also retained in the gap 16 by capillary action.
  • the concave and convex portions are formed on the inner peripheral surface 24a of the shaft insertion hole 24 and the inner peripheral surface 25a of the plurality of through holes 25 in the external gear 20 by driving the small reduction gear 100.
  • the lubricating oil 19 can be retained by utilizing the capillary phenomenon.
  • the support pin 8 having a diameter smaller than the diameter of the through hole 25 the external gear 20 is held on the inner peripheral surface 25 a of the through hole 25 while receiving a load by making point contact with the support pin 8.
  • the lubricating oil 19 can be adapted around the support pin 8. *
  • the external gear 20 can be used for a long time without cutting the oil film between the shaft 7 and the plurality of support pins 8, and the external gear having good lubricity with respect to the shaft 7 and the plurality of support pins 8.
  • the external gear 20 can function as a sliding bearing in the small reduction gear 100, fatigue of the external gear 20 due to friction can be suppressed, and the life can be extended.
  • the carbon material added to the resin material 11 is spherical amorphous carbon, even if the spherical amorphous carbon 12 is exposed from the resin material 11 during use, the shaft 7 and the plurality of support pins 8 are damaged. There is nothing. *
  • the small reduction gear 100 of the present embodiment includes the internal gear 10 including carbon fiber and the external gear 20 including the spherical amorphous carbon 12, sufficient durability and wear resistance can be achieved even if it is small. Is obtained, and a highly reliable small reduction gear 100 can be obtained.
  • the external gear 20 receives both compression force and shear force, durability and wear resistance are important.
  • Spherical amorphous carbon is hard to break and hard to cut. Therefore, the durability and wear resistance of the external gear 20 can be improved by adding the spherical amorphous carbon 12 to the resin material 11.
  • the spherical amorphous carbon 12 is included in the resin material 11 as the carbon material.
  • the spherical amorphous carbon 12 not only the spherical amorphous carbon 12 but also carbon fibers may be mixed in the resin material 11. Good.
  • the amount of spherical amorphous carbon 12 and carbon fiber mixed with the resin material 11 is appropriately selected in consideration of the moldability and dimensional accuracy of the external gear 20.
  • the density of the carbon material in the resin material 11 is improved by mixing not only the spherical amorphous carbon 12 but also the carbon fiber in the resin material 11. Accordingly, the strength of the external gear 20 can be increased, so that the durability and wear resistance of the external gear 20 are further improved.
  • the carbon fiber is mixed with the resin material 11, but not only the carbon fiber but also spherical amorphous carbon may be mixed.
  • SYMBOLS 7 Shaft (1st shaft), 10 ... Internal gear, 11 ... Resin material, 12 ... Spherical amorphous carbon (carbon material), 15 ... Clearance, 20 ... External gear (resin gear), 24 ... Shaft insertion hole (First through hole), 25 ... through hole (second through hole), 100 ... small reduction gear (gear mechanism)

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Gears, Cams (AREA)
  • Retarders (AREA)

Abstract

L'invention concerne un engrenage en résine qui, selon un mode de réalisation, est constitué d'un matériau mixte composé d'un matériau résine et d'un matériau carbone, le matériau carbone étant un carbone amorphe sous forme sphérique.
PCT/JP2018/007890 2017-03-28 2018-03-01 Engrenage en résine et mécanisme d'engrenage Ceased WO2018180184A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201880018136.1A CN110418911A (zh) 2017-03-28 2018-03-01 树脂齿轮和齿轮机构
JP2019509047A JPWO2018180184A1 (ja) 2017-03-28 2018-03-01 樹脂歯車及び歯車機構

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-063206 2017-03-28
JP2017063206 2017-03-28

Publications (1)

Publication Number Publication Date
WO2018180184A1 true WO2018180184A1 (fr) 2018-10-04

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PCT/JP2018/007890 Ceased WO2018180184A1 (fr) 2017-03-28 2018-03-01 Engrenage en résine et mécanisme d'engrenage

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CN (1) CN110418911A (fr)
WO (1) WO2018180184A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220074466A1 (en) * 2019-05-22 2022-03-10 Suzhou Huazhen Industry Rv Reducer Co., Ltd. Reducer for high precision control

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01216823A (ja) * 1988-02-26 1989-08-30 Adachi Shin Sangyo Kk 樹脂成形用材料
JP2016013821A (ja) * 2014-07-03 2016-01-28 日本精工株式会社 電動パワーステアリング装置
JP2016125658A (ja) * 2014-12-26 2016-07-11 Ntn株式会社 摺動部材及びその製造方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5952249A (en) * 1996-12-17 1999-09-14 Textron Systems Corporation Amorphous carbon-coated carbon fabric wet friction material
JP4245997B2 (ja) * 2003-07-07 2009-04-02 直樹 宮城 小形ギアポンプ
DE102011016611A1 (de) * 2011-04-01 2012-10-04 Technische Universität Dresden Gleitsystem

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01216823A (ja) * 1988-02-26 1989-08-30 Adachi Shin Sangyo Kk 樹脂成形用材料
JP2016013821A (ja) * 2014-07-03 2016-01-28 日本精工株式会社 電動パワーステアリング装置
JP2016125658A (ja) * 2014-12-26 2016-07-11 Ntn株式会社 摺動部材及びその製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220074466A1 (en) * 2019-05-22 2022-03-10 Suzhou Huazhen Industry Rv Reducer Co., Ltd. Reducer for high precision control
US11644085B2 (en) * 2019-05-22 2023-05-09 Suzhou Huazhen Industry Rv Reducer Co., Ltd. Reducer for high precision control

Also Published As

Publication number Publication date
JPWO2018180184A1 (ja) 2020-02-06
CN110418911A (zh) 2019-11-05

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