WO2018021194A1 - Gear and method for manufacturing gear - Google Patents

Gear and method for manufacturing gear Download PDF

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Publication number
WO2018021194A1
WO2018021194A1 PCT/JP2017/026543 JP2017026543W WO2018021194A1 WO 2018021194 A1 WO2018021194 A1 WO 2018021194A1 JP 2017026543 W JP2017026543 W JP 2017026543W WO 2018021194 A1 WO2018021194 A1 WO 2018021194A1
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WO
WIPO (PCT)
Prior art keywords
gear
support
annular
peripheral surface
resin
Prior art date
Application number
PCT/JP2017/026543
Other languages
French (fr)
Japanese (ja)
Inventor
翔吾 小倉
光史 野村
Original Assignee
Ｋｙｂ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 Ｋｙｂ株式会社 filed Critical Ｋｙｂ株式会社
Publication of WO2018021194A1 publication Critical patent/WO2018021194A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • 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
    • 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
    • F16H55/14—Construction providing resilience or vibration-damping

Definitions

  • the present invention relates to a gear and a method for manufacturing the gear.
  • gears are known as means for transmitting the rotational force of the drive shaft to the driven shaft.
  • the gear disclosed in US2010 / 201030A1 includes a hub provided on the outer periphery of the drive shaft or the driven shaft, an annular outer portion that forms a plurality of teeth on the outer periphery, a connecting portion that connects the hub and the outer portion, Have
  • the hub is made of metal, and the outer part is made of synthetic resin.
  • the connecting portion is made of a synthetic resin harder than the material of the outer portion, and the rotational force is favorably transmitted between the hub and the outer portion.
  • the hub is in contact with a connecting portion formed of a hard resin material. Therefore, the vibration generated when the gear teeth come into contact with each other is transmitted to the hub with almost no damping through the connecting portion. Therefore, there is a possibility that the hub vibrates and abnormal noise is generated.
  • An object of the present invention is to reduce abnormal noise generated when gear teeth come into contact with each other.
  • the gear includes an annular gear portion having teeth on the outer periphery, an annular resin support portion that is provided on the inner peripheral surface of the gear portion and supports the gear portion, and an inner side of the support portion.
  • a metal core provided at a distance from the inner peripheral surface of the support portion, and an annular shape provided between the inner peripheral surface of the support portion and the outer peripheral surface of the core portion to connect the support portion and the core portion.
  • a connecting portion, and the connecting portion is formed of a resin having a lower elastic modulus than the support portion.
  • Another aspect of the present invention includes an annular gear portion, an annular support portion that is provided on the inner peripheral surface of the gear portion and supports the gear portion, a core portion that is provided inside the support portion, and a support portion.
  • the present invention relates to a method of manufacturing a gear provided with an annular connecting portion that is provided between an inner peripheral surface and an outer peripheral surface of a core portion and connects a support portion and the core portion.
  • a method for manufacturing a gear includes a step of placing a core part in a mold and filling a resin in the mold to form a gear part and a connection part, and between the gear part and the connection part. Filling a resin having a higher elastic modulus than the connecting portion and molding the support portion.
  • FIG. 1 is a front view of a gear according to an embodiment of the present invention and shows a state in which it is engaged with a worm shaft.
  • FIG. 2 is a sectional view taken along line II-II in FIG.
  • FIG. 3A is a cross-sectional view of the gear portion and is shown corresponding to FIG.
  • FIG. 3B is a front view of the gear unit.
  • FIG. 4A is a cross-sectional view of the support portion and is shown corresponding to FIG. 4B is a cross-sectional view taken along IVB-IVB in FIG. 4A.
  • FIG. 5A is a cross-sectional view of the connecting portion and is shown corresponding to FIG.
  • FIG. 5B is a front view of the connecting portion.
  • FIG. 6 is a view for explaining the manufacturing method according to the embodiment of the present invention, and shows a state in which a core portion is arranged in a mold and filled with a resin material.
  • FIG. 7 is a view for explaining the manufacturing method according to the embodiment of the present invention, and shows a state where the unnecessary portion is removed and the gear portion and the connecting portion are molded.
  • FIG. 8 is a view for explaining the manufacturing method according to the embodiment of the present invention, and shows a state in which a fiber reinforced resin material is filled between the gear portion and the connecting portion.
  • the gear 100 is used in the worm speed reducer 1.
  • the gear 100 is also called a “worm wheel”.
  • the gear 100 meshes with the worm shaft 6.
  • the worm shaft 6 is connected to a rotating shaft (not shown) of the motor, and the gear 100 is connected to, for example, a pinion (not shown).
  • the gear 100 When the worm shaft 6 is rotated with the rotation of the motor, the gear 100 is rotated. At this time, the rotation of the worm shaft 6 is decelerated and transmitted to the gear 100. As the gear 100 rotates, the pinion rotates. Thus, the worm speed reducer 1 reduces the rotation of the motor via the worm shaft 6 and the gear 100 and transmits it to the pinion.
  • a direction along the rotation axis of the gear 100 is simply referred to as an “axial direction”, a radial direction around the rotation axis of the gear 100 is referred to as a “radial direction”, and a direction along the rotation axis of the gear 100 is referred to. This is called “circumferential direction”.
  • the worm shaft 6 has a cylindrical shaft body 6a and shaft teeth 6b formed in a spiral shape on the outer periphery of the shaft body 6a.
  • the worm shaft 6 is made of an iron alloy, and the shaft body 6a and the shaft teeth 6b are integrally formed.
  • a plurality of wheel teeth (teeth) 11 that mesh with the shaft teeth 6 b are formed on the outer periphery of the gear 100.
  • FIG. 2 is a sectional view taken along line II-II in FIG.
  • the gear 100 includes an annular gear portion 10 having wheel teeth 11 on the outer periphery.
  • the gear unit 10 has an annular wheel body 12, and the wheel teeth 11 protrude from the outer periphery of the wheel body 12.
  • the wheel teeth 11 and the wheel main body 12 are made of resin and are integrally formed by molding. Examples of the resin used for the gear unit 10 include, but are not limited to, polyamide 6, polyamide 66, polyamide 46, polyacetal, polyether ether ketone (PEEK), and polyphenylene sulfide (PPS).
  • PES polyphenylene sulfide
  • the support part 20 is formed of a fiber reinforced resin.
  • the fiber reinforced resin is a material in which a fiber reinforcing material such as glass fiber or carbon fiber is mixed with a base resin such as polyamide 6, polyamide 66, polyamide 46, polyacetal, PEEK, or PPS.
  • the gear 100 a fiber reinforcing material is not blended in the resin used for the gear unit 10, the resin used for the gear unit 10 is softer than the fiber reinforced resin, and the elastic modulus of the resin used for the gear unit 10 is The elastic modulus of the fiber reinforced resin used for the support portion 20 is lower.
  • the core part 30 is provided inside the support part 20 with a space from the inner peripheral surface 20a of the support part 20.
  • the core 30 is made of metal.
  • the core portion 30 is formed in an annular shape, and a pinion shaft (not shown) is fitted to the inner peripheral surface 30 a of the core portion 30.
  • an annular connecting portion 40 that connects the support portion 20 and the core portion 30 is provided.
  • the inner peripheral surface 40 a of the connecting portion 40 is fixed to the outer peripheral surface 20 b of the core portion 30.
  • the vibration of the support part 20 is transmitted to the core part 30 through the connecting part 40.
  • the connecting part 40 is formed of the same resin as the gear part 10.
  • the connecting portion 40 is formed of a resin such as polyamide 6, polyamide 66, polyamide 46, polyacetal, PEEK, or PPS. These resins are not blended with fiber reinforcing material, are softer than the fiber reinforced resin used for the support portion 20, and the elastic modulus of the resin used for the connecting portion 40 is that of the fiber reinforced resin used for the support portion 20. Lower than elastic modulus.
  • the connecting portion 40 is formed of a resin having a lower elastic modulus than the fiber reinforced resin, the vibration generated when the shaft teeth 6b and the wheel teeth 11 come into contact with each other is attenuated through the connecting portion 40 from the support portion 20 while the core portion. 30. Therefore, the vibration of the core part 30 can be prevented, and abnormal noise generated when the shaft teeth 6b and the wheel teeth 11 come into contact with each other can be reduced.
  • the connecting portion 40 is formed by molding using the same material as the gear portion 10.
  • the connecting part 40 may be formed in the same process as the process of forming the gear part 10, and the gear part 10 and the connecting part 40 need not be formed in separate processes. Therefore, the man-hour in manufacture of the gear 100 can be reduced.
  • FIG. 3A is a cross-sectional view of the gear unit 10 and is shown corresponding to FIG.
  • FIG. 3B is a front view of the gear unit 10.
  • the gear portion 10 includes an annular protrusion 51a that protrudes radially inward from the inner peripheral surface 10a, and a plurality of rod-shaped protrusions 52a that protrude in the axial direction from the annular protrusion 51a.
  • FIG. 4A is a cross-sectional view of the support portion 20 and corresponds to FIG. 4B is a cross-sectional view taken along the line IVB-IVB in FIG. 4A.
  • an annular groove 51 b extending in the circumferential direction is formed on the outer peripheral surface 20 b of the support portion 20, and a plurality of holes extending in the axial direction are formed on both side surfaces of the annular groove 51 b. 52b is formed.
  • the annular protrusion 51a of the gear portion 10 is disposed in the annular groove 51b of the support portion 20, and contacts the side surface of the annular groove 51b. That is, the gear part 10 and the support part 20 are formed with the annular protrusion 51a and the annular groove part 51b in contact with each other in the axial direction. For this reason, the relative movement of the gear portion 10 and the support portion 20 in the axial direction is restricted. Therefore, it can prevent that the gear part 10 and the support part 20 isolate
  • the rod-like protrusion 52a of the gear part 10 is disposed in the hole 52b of the support part 20, and contacts the side surface of the hole 52b. That is, the gear portion 10 and the support portion 20 are formed with contact portions that contact each other in the circumferential direction by the rod-like protrusions 52a and the hole portions 52b. Therefore, the relative rotation of the gear unit 10 and the support unit 20 in the circumferential direction is restricted. Therefore, the rotational force can be reliably transmitted between the gear portion 10 and the support portion 20.
  • FIG. 5A is a cross-sectional view of the connecting portion 40, corresponding to FIG. FIG. 5B is a front view of the connecting portion 40.
  • the connecting portion 40 includes an annular protrusion 56a that protrudes radially outward from the outer peripheral surface 40b, and a plurality of rod-shaped protrusions 57a that protrude in the axial direction from the annular protrusion 56a.
  • annular groove portion 56b extending in the circumferential direction is formed on the inner peripheral surface 20a of the support portion 20, and a plurality of holes extending in the axial direction are formed on both side surfaces of the annular groove portion 56b.
  • a portion 57b is formed.
  • the annular protrusion 56a of the connecting portion 40 is disposed in the annular groove portion 56b of the support portion 20, and contacts the side surface of the annular groove portion 56b. That is, the contact portion (first contact portion) that contacts each other in the axial direction is formed in the coupling portion 40 and the support portion 20 by the annular protrusion 56a and the annular groove portion 56b. Therefore, the relative movement in the axial direction between the connecting portion 40 and the support portion 20 is restricted. Therefore, it can prevent that the connection part 40 and the support part 20 isolate
  • the rod-like protrusion 57a of the connecting part 40 is disposed in the hole 57b of the support part 20 and contacts the side surface of the hole 57b. That is, a contact portion (second contact portion) that contacts each other in the circumferential direction is formed in the connecting portion 40 and the support portion 20 by the rod-shaped protrusion 57a and the hole portion 57b. Therefore, relative rotation in the circumferential direction between the connecting portion 40 and the support portion 20 is restricted. Therefore, the rotational force can be reliably transmitted between the connecting portion 40 and the support portion 20.
  • the annular protrusion 51 a is formed over the entire circumference of the gear section 10, and the annular groove 51 b is formed over the entire circumference of the support section 20.
  • the annular protrusion 51a may be partially formed in the circumferential direction.
  • the annular groove 51b may be partially formed in the circumferential direction corresponding to the annular protrusion 51a.
  • annular protrusion 56 a is formed over the entire periphery of the connecting portion 40, and the annular groove portion 56 b is formed over the entire periphery of the support portion 20.
  • the annular protrusion 56a may be partially formed in the circumferential direction.
  • the annular groove 56b may be partially formed in the circumferential direction corresponding to the annular protrusion 56a.
  • the rod-shaped protrusions 52a are provided on both sides of the annular protrusion 51a, and the hole parts 52b are provided on both side surfaces of the annular groove 51b.
  • the rod-shaped protrusion 52a may be provided only on one side of the annular protrusion 51a.
  • the hole 52b may be provided only on one side surface of the annular groove 51b corresponding to the rod-shaped protrusion 52a.
  • the rod-shaped protrusion 57a is provided on both sides of the annular protrusion 56a, and the hole 57b is provided on both sides of the annular groove 56b.
  • the rod-shaped protrusion 57a may be provided only on one side of the annular protrusion 56a.
  • the hole portion 57b may be provided only on one side surface of the annular groove portion 56b corresponding to the rod-shaped protrusion 57a.
  • the annular protrusion 51 a may be formed on the outer peripheral surface 20 b of the support portion 20 instead of the inner peripheral surface 10 a of the gear portion 10.
  • the annular groove portion 51 b is formed on the inner peripheral surface 10 a of the gear portion 10 instead of the outer peripheral surface 20 b of the support portion 20.
  • the annular protrusion 56 a may be formed on the inner peripheral surface 20 a of the support portion 20 instead of the outer peripheral surface 40 b of the connecting portion 40.
  • the annular groove portion 56 b is formed on the outer peripheral surface 40 b of the connecting portion 40 instead of the inner peripheral surface 20 a of the support portion 20.
  • the rod-like protrusion 52a may be provided on the side surface of the annular groove 51b instead of the annular protrusion 51a.
  • the hole 52b is formed on the side surface of the annular protrusion 51a in place of the side surface of the annular groove 51b.
  • the rod-like protrusion 57a may be provided on the side surface of the annular groove 56b instead of the annular protrusion 56a.
  • the hole portion 57b is formed on the side surface of the annular protrusion 56a instead of the side surface of the annular groove portion 56b.
  • the gear 100 is manufactured by filling a mold with a molten material, but the mold is not shown in FIGS. 6 to 8.
  • a core 30 formed in advance is placed in a mold.
  • the gear portion 10 and the connecting portion 40 are molded by filling the mold with a resin not containing a fiber reinforcing material. At this time, the outer peripheral surface 30b of the core part 30 and the inner peripheral surface 40a of the connection part 40 adhere.
  • a resin part 71 is formed corresponding to the gate of the mold.
  • the gear part 10 and the connection part 40 are connected via a resin part 72 formed corresponding to the shape of the mold.
  • the gear part 10, the connecting part 40, and the core part 30 are removed from the mold, and the gear part 10 and the connecting part 40 are separated. Specifically, as shown in FIG. 7, unnecessary resin portions 71 and 72 are removed from the molded gear portion 10 and the connecting portion 40. The connecting part 40 and the core part 30 remain fixed.
  • the gear portion 10, the connecting portion 40, and the core portion 30 are arranged in different molds.
  • the fiber reinforced resin is filled in the mold (between the gear portion 10 and the connecting portion 40) to form the support portion 20.
  • a resin part 73 is formed on the support part 20 corresponding to the gate of the mold.
  • the gear unit 10 When the fiber reinforced resin is solidified, the gear unit 10, the support unit 20, the connection unit 40, and the core unit 30 are removed from the mold. By removing the unnecessary resin portion 73 from the support portion 20, the gear 100 is completed.
  • the gear portion 10 and the connecting portion 40 are formed in the same process because the gear portion 10 and the connecting portion 40 are simultaneously molded by filling the resin in the mold.
  • the gear portion 10 and the connecting portion 40 need not be formed in separate steps, and the number of steps in manufacturing the gear 100 can be reduced.
  • the support portion 20 is formed of a fiber reinforced resin
  • the connecting portion 40 is formed of a resin having a lower elastic modulus than the fiber reinforced resin.
  • connection part 40 and the support part 20 isolate
  • a contact portion (second contact portion) that contacts each other in the circumferential direction is formed by a rod-shaped protrusion 57a and a hole portion 57b. Therefore, relative rotation in the circumferential direction between the connecting portion 40 and the support portion 20 is restricted. Therefore, the rotational force can be reliably transmitted between the connecting portion 40 and the support portion 20.
  • the gear part 10 and the connecting part 40 are formed of the same material.
  • the connecting part 40 may be formed in the same process as the process of forming the gear part 10, and the gear part 10 and the connecting part 40 need not be formed in separate processes. Man-hours in manufacturing the gear 100 can be reduced, and the gear 100 can be manufactured at low cost.
  • the gear 100 includes an annular gear portion 10 having wheel teeth 11 on the outer periphery, an annular resin support portion 20 that is provided on the inner peripheral surface 10a of the gear portion 10 and supports the gear portion 10; Provided between the inner peripheral surface 20a of the support portion 20 and the metallic core portion 30 provided at a distance from the inner peripheral surface 20a of the support portion 20, and between the inner peripheral surface 20a of the support portion 20 and the outer peripheral surface 30b of the core portion 30. And an annular connecting portion 40 that connects the support portion 20 and the core portion 30, and the connecting portion 40 is formed of a resin having a lower elastic modulus than the support portion 20.
  • the wheel teeth 11 of the gear 100 are connected to the worm shaft 6.
  • the vibration generated when hitting the shaft teeth 6 b is transmitted to the core portion 30 while being attenuated through the connecting portion 40. Therefore, the vibration of the core part 30 can be prevented, and the noise generated when the wheel teeth 11 and the shaft teeth 6b come into contact with each other can be reduced.
  • the connecting portion 40 is formed of the same material as the gear portion 10.
  • the gear part 10 is formed of the same material as that of the connecting part 40, the gear part 10 and the connecting part 40 may be formed in the same process, and the gear part 10 and the connecting part 40 are formed in separate processes. It does not have to be formed. Therefore, the man-hour in manufacturing the gear 100 can be reduced.
  • the support part 20 and the connection part 40 have the annular protrusion 56a and the annular groove part 56b which mutually contact in an axial direction.
  • the support portion 20 and the connecting portion 40 have the annular protrusion 56a and the annular groove portion 56b that contact in the axial direction, the relative movement in the axial direction between the support portion 20 and the connecting portion 40 is restricted. Therefore, it can prevent that the support part 20 and the connection part 40 isolate
  • the support part 20 and the connection part 40 have the rod-shaped protrusion part 57a and the hole part 57b which mutually contact in the circumferential direction.
  • the support portion 20 and the connecting portion 40 have the rod-like protrusions 57a and the hole portions 57b that contact in the circumferential direction, the relative rotation between the support portion 20 and the connecting portion 40 is restricted. Therefore, the rotational force can be reliably transmitted between the gear portion 10 and the core portion 30.
  • the present embodiment relates to a method of manufacturing the gear 100, the step of arranging the core portion 30 in the mold and filling the mold with resin to form the gear portion 10 and the connecting portion 40, and the gear.
  • gear portion 10 and the connecting portion 40 are formed by filling the mold with resin, the gear portion 10 and the connecting portion 40 are formed in the same process.
  • the gear portion 10 and the connecting portion 40 need not be formed in separate steps, and the number of steps in manufacturing the gear 100 can be reduced.
  • the gear portion 10 and the connecting portion 40 are formed of the same resin, but the gear portion 10 and the connecting portion 40 may be formed of different resins.
  • connection part 40 is formed with resin
  • the connection part 40 may be formed with materials other than resin, for example, rubber
  • gear (worm wheel) 100 that meshes with the worm shaft 6 has been described, but the present invention may be applied to gears that mesh with each other.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Gears, Cams (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

A gear (100) equipped with: an annular gear section (10); an annular resin support section (20) that supports the gear section (10); a metal core section (30) that is provided on the inside of the support section (20), with an interval between the inner circumferential surface (20a) of the support section (20) and the metal core section; and an annular connecting section (40) that is provided between the inner circumferential surface (20a) of the support section (20) and the outer circumferential surface (30b) of the core section (30), and that connects the support section (20) and the core section (30). The connecting section (40) is formed from a resin having lower elasticity than the support section (20).

Description

ギヤ、及びギヤの製造方法GEAR AND GEAR MANUFACTURING METHOD
　本発明は、ギヤ、及びギヤを製造する方法に関する。 The present invention relates to a gear and a method for manufacturing the gear.
　従来、駆動軸の回転力を被駆動軸に伝達する手段としてギヤが知られている。ＵＳ２０１０／２０１０３０Ａ１に開示されるギヤは、駆動軸又は被駆動軸の外周に設けられるハブと、複数の歯を外周に形成する環状の外側部と、ハブと外側部とを連結する連結部と、を有する。ハブは金属で形成され、外側部は合成樹脂で形成される。連結部は、外側部の材料よりも硬い合成樹脂で形成され、ハブと外側部との間で回転力が良好に伝達される。 Conventionally, gears are known as means for transmitting the rotational force of the drive shaft to the driven shaft. The gear disclosed in US2010 / 201030A1 includes a hub provided on the outer periphery of the drive shaft or the driven shaft, an annular outer portion that forms a plurality of teeth on the outer periphery, a connecting portion that connects the hub and the outer portion, Have The hub is made of metal, and the outer part is made of synthetic resin. The connecting portion is made of a synthetic resin harder than the material of the outer portion, and the rotational force is favorably transmitted between the hub and the outer portion.
　ＵＳ２０１０／２０１０３０Ａ１に開示されるギヤでは、ハブは、硬い樹脂材料で形成された連結部に接触する。そのため、ギヤの歯どうしが当たるときに生じる振動は、連結部を通じてほとんど減衰することなくハブに伝わる。そのため、ハブが振動し、異音が生じるおそれがある。 In the gear disclosed in US2010 / 201030A1, the hub is in contact with a connecting portion formed of a hard resin material. Therefore, the vibration generated when the gear teeth come into contact with each other is transmitted to the hub with almost no damping through the connecting portion. Therefore, there is a possibility that the hub vibrates and abnormal noise is generated.
　本発明は、ギヤの歯どうしが当たるときに生じる異音を低減させることを目的とする。 An object of the present invention is to reduce abnormal noise generated when gear teeth come into contact with each other.
　本発明のある態様によれば、ギヤは、外周に歯を有する環状の歯車部と、歯車部の内周面に設けられ歯車部を支持する環状の樹脂製の支持部と、支持部の内側に支持部の内周面と間隔を空けて設けられる金属製の芯部と、支持部の内周面と芯部の外周面との間に設けられ支持部と芯部とを連結する環状の連結部と、を備え、連結部は、支持部よりも弾性率の低い樹脂で形成される。 According to an aspect of the present invention, the gear includes an annular gear portion having teeth on the outer periphery, an annular resin support portion that is provided on the inner peripheral surface of the gear portion and supports the gear portion, and an inner side of the support portion. A metal core provided at a distance from the inner peripheral surface of the support portion, and an annular shape provided between the inner peripheral surface of the support portion and the outer peripheral surface of the core portion to connect the support portion and the core portion. A connecting portion, and the connecting portion is formed of a resin having a lower elastic modulus than the support portion.
　また、本発明の別の態様は、環状の歯車部と、歯車部の内周面に設けられ歯車部を支持する環状の支持部と、支持部の内側に設けられる芯部と、支持部の内周面と芯部の外周面との間に設けられ支持部と芯部とを連結する環状の連結部と、を備えるギヤを製造する方法に係る。この態様において、ギヤを製造する方法は、金型内に芯部を配置し樹脂を金型内に充填して歯車部と連結部とを成形する工程と、歯車部と連結部との間に連結部より弾性率の高い樹脂を充填して支持部を成形する工程と、を備える。 Another aspect of the present invention includes an annular gear portion, an annular support portion that is provided on the inner peripheral surface of the gear portion and supports the gear portion, a core portion that is provided inside the support portion, and a support portion. The present invention relates to a method of manufacturing a gear provided with an annular connecting portion that is provided between an inner peripheral surface and an outer peripheral surface of a core portion and connects a support portion and the core portion. In this aspect, a method for manufacturing a gear includes a step of placing a core part in a mold and filling a resin in the mold to form a gear part and a connection part, and between the gear part and the connection part. Filling a resin having a higher elastic modulus than the connecting portion and molding the support portion.
図１は、本発明の実施形態に係るギヤの正面図であり、ウォームシャフトと噛み合った状態を示す。FIG. 1 is a front view of a gear according to an embodiment of the present invention and shows a state in which it is engaged with a worm shaft. 図２は、図１のＩＩ－ＩＩ線に沿う断面図である。FIG. 2 is a sectional view taken along line II-II in FIG. 図３Ａは、歯車部の断面図であり、図２に対応して示す。FIG. 3A is a cross-sectional view of the gear portion and is shown corresponding to FIG. 図３Ｂは、歯車部の正面図である。FIG. 3B is a front view of the gear unit. 図４Ａは、支持部の断面図であり、図２に対応して示す。FIG. 4A is a cross-sectional view of the support portion and is shown corresponding to FIG. 図４Ｂは、図４ＡのＩＶＢ－ＩＶＢに沿う断面図である。4B is a cross-sectional view taken along IVB-IVB in FIG. 4A. 図５Ａは、連結部の断面図であり、図２に対応して示す。FIG. 5A is a cross-sectional view of the connecting portion and is shown corresponding to FIG. 図５Ｂは、連結部の正面図である。FIG. 5B is a front view of the connecting portion. 図６は、本発明の実施形態に係る製造方法を説明するための図であり、型に芯部を配置し樹脂材料を充填した状態を示す。FIG. 6 is a view for explaining the manufacturing method according to the embodiment of the present invention, and shows a state in which a core portion is arranged in a mold and filled with a resin material. 図７は、本発明の実施形態に係る製造方法を説明するための図であり、不要部を除去して歯車部及び連結部を成形した状態を示す。FIG. 7 is a view for explaining the manufacturing method according to the embodiment of the present invention, and shows a state where the unnecessary portion is removed and the gear portion and the connecting portion are molded. 図８は、本発明の実施形態に係る製造方法を説明するための図であり、歯車部と連結部との間に繊維強化樹脂材料を充填した状態を示す。FIG. 8 is a view for explaining the manufacturing method according to the embodiment of the present invention, and shows a state in which a fiber reinforced resin material is filled between the gear portion and the connecting portion.
　以下、図面を参照して、本発明の実施形態に係るギヤ１００について説明する。 Hereinafter, a gear 100 according to an embodiment of the present invention will be described with reference to the drawings.
　図１に示すようにギヤ１００は、ウォーム減速機１に用いられる。ギヤ１００は、「ウォームホイール」とも呼ばれる。 As shown in FIG. 1, the gear 100 is used in the worm speed reducer 1. The gear 100 is also called a “worm wheel”.
　ウォーム減速機１では、ギヤ１００はウォームシャフト６と噛み合う。ウォームシャフト６はモータの回転軸（不図示）に連結され、ギヤ１００は例えばピニオン（不図示）に連結される。 In the worm reduction gear 1, the gear 100 meshes with the worm shaft 6. The worm shaft 6 is connected to a rotating shaft (not shown) of the motor, and the gear 100 is connected to, for example, a pinion (not shown).
　モータの回転に伴ってウォームシャフト６が回転すると、ギヤ１００が回転する。このとき、ウォームシャフト６の回転は、減速してギヤ１００に伝達される。ギヤ１００の回転に伴って、ピニオンが回転する。このように、ウォーム減速機１は、モータの回転をウォームシャフト６及びギヤ１００を介して減速してピニオンに伝達する。 When the worm shaft 6 is rotated with the rotation of the motor, the gear 100 is rotated. At this time, the rotation of the worm shaft 6 is decelerated and transmitted to the gear 100. As the gear 100 rotates, the pinion rotates. Thus, the worm speed reducer 1 reduces the rotation of the motor via the worm shaft 6 and the gear 100 and transmits it to the pinion.
　以下において、ギヤ１００の回転軸に沿う方向を単に「軸方向」と称し、ギヤ１００の回転軸を中心とする放射方向を「径方向」と称し、ギヤ１００の回転軸の周りに沿う方向を「周方向」と称する。 Hereinafter, a direction along the rotation axis of the gear 100 is simply referred to as an “axial direction”, a radial direction around the rotation axis of the gear 100 is referred to as a “radial direction”, and a direction along the rotation axis of the gear 100 is referred to. This is called “circumferential direction”.
　ウォームシャフト６は、円柱状のシャフト本体６ａと、シャフト本体６ａの外周に螺旋状に形成されるシャフト歯６ｂと、を有する。ウォームシャフト６は、鉄合金で形成され、シャフト本体６ａとシャフト歯６ｂとは一体的に形成される。 The worm shaft 6 has a cylindrical shaft body 6a and shaft teeth 6b formed in a spiral shape on the outer periphery of the shaft body 6a. The worm shaft 6 is made of an iron alloy, and the shaft body 6a and the shaft teeth 6b are integrally formed.
　ギヤ１００の外周には、シャフト歯６ｂと噛み合う複数のホイール歯（歯）１１が形成される。 A plurality of wheel teeth (teeth) 11 that mesh with the shaft teeth 6 b are formed on the outer periphery of the gear 100.
　ウォームシャフト６が所定の方向（図１に示すＤ１方向）に回転すると、ホイール歯１１がシャフト歯６ｂによって押される。その結果、ギヤ１００は、図１に示すＤ３方向に回転する。ウォームシャフト６が逆方向（図１に示すＤ２方向）に回転すると、ホイール歯１１はシャフト歯６ｂによって逆方向に押される。その結果、ギヤ１００は、図１に示すＤ４方向に回転する。 When the worm shaft 6 rotates in a predetermined direction (D1 direction shown in FIG. 1), the wheel teeth 11 are pushed by the shaft teeth 6b. As a result, the gear 100 rotates in the direction D3 shown in FIG. When the worm shaft 6 rotates in the reverse direction (D2 direction shown in FIG. 1), the wheel teeth 11 are pushed in the reverse direction by the shaft teeth 6b. As a result, the gear 100 rotates in the direction D4 shown in FIG.
　図２は、図１のＩＩ－ＩＩ線に沿う断面図である。図１及び図２に示すように、ギヤ１００は、外周にホイール歯１１を有する環状の歯車部１０を備える。歯車部１０は、円環状のホイール本体１２を有し、ホイール歯１１はホイール本体１２の外周から突出する。ホイール歯１１及びホイール本体１２は樹脂からなり、型成形によって一体的に形成される。歯車部１０に用いられる樹脂としては、ポリアミド６、ポリアミド６６、ポリアミド４６、ポリアセタール、ポリエーテルエーテルケトン（ＰＥＥＫ）及びポリフェニレンサルファイド（ＰＰＳ）等が挙げられるが、これらに限られない。 FIG. 2 is a sectional view taken along line II-II in FIG. As shown in FIGS. 1 and 2, the gear 100 includes an annular gear portion 10 having wheel teeth 11 on the outer periphery. The gear unit 10 has an annular wheel body 12, and the wheel teeth 11 protrude from the outer periphery of the wheel body 12. The wheel teeth 11 and the wheel main body 12 are made of resin and are integrally formed by molding. Examples of the resin used for the gear unit 10 include, but are not limited to, polyamide 6, polyamide 66, polyamide 46, polyacetal, polyether ether ketone (PEEK), and polyphenylene sulfide (PPS).
　歯車部１０の内周面１０ａには、歯車部１０を支持する環状の支持部２０が設けられる。支持部２０は、繊維強化樹脂で形成される。繊維強化樹脂は、例えば、ポリアミド６、ポリアミド６６、ポリアミド４６、ポリアセタール、ＰＥＥＫ及びＰＰＳ等のベース樹脂に、ガラス繊維や炭素繊維等の繊維補強材を配合した材料である。 An annular support portion 20 that supports the gear portion 10 is provided on the inner peripheral surface 10 a of the gear portion 10. The support part 20 is formed of a fiber reinforced resin. The fiber reinforced resin is a material in which a fiber reinforcing material such as glass fiber or carbon fiber is mixed with a base resin such as polyamide 6, polyamide 66, polyamide 46, polyacetal, PEEK, or PPS.
　ギヤ１００では、歯車部１０に用いられる樹脂には繊維補強材が配合されておらず、歯車部１０に用いられる樹脂は、繊維強化樹脂よりも柔らかく、歯車部１０に用いられる樹脂の弾性率は、支持部２０に用いられる繊維強化樹脂の弾性率よりも低い。シャフト歯６ｂとホイール歯１１とが噛み合ったときにシャフト歯６ｂが磨耗しにくく、ウォーム減速機１の耐久性を向上させることができる。 In the gear 100, a fiber reinforcing material is not blended in the resin used for the gear unit 10, the resin used for the gear unit 10 is softer than the fiber reinforced resin, and the elastic modulus of the resin used for the gear unit 10 is The elastic modulus of the fiber reinforced resin used for the support portion 20 is lower. When the shaft teeth 6b and the wheel teeth 11 mesh with each other, the shaft teeth 6b are not easily worn, and the durability of the worm speed reducer 1 can be improved.
　支持部２０の内側には、支持部２０の内周面２０ａと間隔を空けて芯部３０が設けられる。芯部３０は、金属で形成される。芯部３０は環状に形成され、芯部３０の内周面３０ａにピニオンの軸（図示省略）が嵌合する。 The core part 30 is provided inside the support part 20 with a space from the inner peripheral surface 20a of the support part 20. The core 30 is made of metal. The core portion 30 is formed in an annular shape, and a pinion shaft (not shown) is fitted to the inner peripheral surface 30 a of the core portion 30.
　支持部２０の内周面２０ａと芯部３０の外周面２０ｂとの間には、支持部２０と芯部３０とを連結する環状の連結部４０が設けられる。連結部４０の内周面４０ａは、芯部３０の外周面２０ｂに固着する。支持部２０の振動は、連結部４０を通じて芯部３０に伝わる。 Between the inner peripheral surface 20a of the support portion 20 and the outer peripheral surface 20b of the core portion 30, an annular connecting portion 40 that connects the support portion 20 and the core portion 30 is provided. The inner peripheral surface 40 a of the connecting portion 40 is fixed to the outer peripheral surface 20 b of the core portion 30. The vibration of the support part 20 is transmitted to the core part 30 through the connecting part 40.
　連結部４０は、歯車部１０と同じ樹脂で形成される。具体的には、連結部４０は、ポリアミド６、ポリアミド６６、ポリアミド４６、ポリアセタール、ＰＥＥＫ及びＰＰＳ等の樹脂で形成される。これらの樹脂には繊維補強材が配合されておらず、支持部２０に用いられる繊維強化樹脂よりも柔らかく、連結部４０に用いられる樹脂の弾性率は、支持部２０に用いられる繊維強化樹脂の弾性率よりも低い。 The connecting part 40 is formed of the same resin as the gear part 10. Specifically, the connecting portion 40 is formed of a resin such as polyamide 6, polyamide 66, polyamide 46, polyacetal, PEEK, or PPS. These resins are not blended with fiber reinforcing material, are softer than the fiber reinforced resin used for the support portion 20, and the elastic modulus of the resin used for the connecting portion 40 is that of the fiber reinforced resin used for the support portion 20. Lower than elastic modulus.
　連結部４０が、繊維強化樹脂よりも弾性率の低い樹脂で形成されるので、シャフト歯６ｂとホイール歯１１とが当たるときに生じる振動は、支持部２０から連結部４０を通じて減衰しながら芯部３０に伝わる。したがって、芯部３０の振動を防止することができ、シャフト歯６ｂとホイール歯１１とが当たるときに生じる異音を低減させることができる。 Since the connecting portion 40 is formed of a resin having a lower elastic modulus than the fiber reinforced resin, the vibration generated when the shaft teeth 6b and the wheel teeth 11 come into contact with each other is attenuated through the connecting portion 40 from the support portion 20 while the core portion. 30. Therefore, the vibration of the core part 30 can be prevented, and abnormal noise generated when the shaft teeth 6b and the wheel teeth 11 come into contact with each other can be reduced.
　ギヤ１００では、連結部４０は、歯車部１０と同じ材料で型成形により形成される。歯車部１０を成形する工程と同じ工程で連結部４０を成形すればよく、歯車部１０と連結部４０とを別々の工程で成形しなくて済む。したがって、ギヤ１００の製造における工数を減らすことができる。 In the gear 100, the connecting portion 40 is formed by molding using the same material as the gear portion 10. The connecting part 40 may be formed in the same process as the process of forming the gear part 10, and the gear part 10 and the connecting part 40 need not be formed in separate processes. Therefore, the man-hour in manufacture of the gear 100 can be reduced.
　図３Ａは、歯車部１０の断面図であり、図２に対応して示す。図３Ｂは、歯車部１０の正面図である。図３Ａ及び図３Ｂに示すように、歯車部１０は、内周面１０ａから径方向内側に突出する環状突部５１ａと、環状突部５１ａから軸方向に突出する複数の棒状突部５２ａと、を有する。 FIG. 3A is a cross-sectional view of the gear unit 10 and is shown corresponding to FIG. FIG. 3B is a front view of the gear unit 10. As shown in FIGS. 3A and 3B, the gear portion 10 includes an annular protrusion 51a that protrudes radially inward from the inner peripheral surface 10a, and a plurality of rod-shaped protrusions 52a that protrude in the axial direction from the annular protrusion 51a. Have
　図４Ａは、支持部２０の断面図であり、図２に対応して示す。図４Ｂは、図４ＡのＩＶＢ－ＩＶＢ線に沿う断面図である。図４Ａ及び図４Ｂに示すように、支持部２０の外周面２０ｂには周方向に延在する環状溝部５１ｂが形成され、環状溝部５１ｂの両側面には軸方向に延在する複数の穴部５２ｂが形成される。 FIG. 4A is a cross-sectional view of the support portion 20 and corresponds to FIG. 4B is a cross-sectional view taken along the line IVB-IVB in FIG. 4A. As shown in FIGS. 4A and 4B, an annular groove 51 b extending in the circumferential direction is formed on the outer peripheral surface 20 b of the support portion 20, and a plurality of holes extending in the axial direction are formed on both side surfaces of the annular groove 51 b. 52b is formed.
　図２に示すように、歯車部１０の環状突部５１ａは、支持部２０の環状溝部５１ｂ内に配置され、環状溝部５１ｂの側面と接触する。つまり、歯車部１０及び支持部２０には、軸方向に互いに接触する接触部が環状突部５１ａと環状溝部５１ｂとによって形成される。そのため、歯車部１０と支持部２０との軸方向への相対移動が規制される。したがって、歯車部１０と支持部２０とが分離するのを防止することができる。 As shown in FIG. 2, the annular protrusion 51a of the gear portion 10 is disposed in the annular groove 51b of the support portion 20, and contacts the side surface of the annular groove 51b. That is, the gear part 10 and the support part 20 are formed with the annular protrusion 51a and the annular groove part 51b in contact with each other in the axial direction. For this reason, the relative movement of the gear portion 10 and the support portion 20 in the axial direction is restricted. Therefore, it can prevent that the gear part 10 and the support part 20 isolate | separate.
　歯車部１０の棒状突部５２ａは、支持部２０の穴部５２ｂ内に配置され、穴部５２ｂの側面と接触する。つまり、歯車部１０及び支持部２０には、周方向に互いに接触する接触部が棒状突部５２ａと穴部５２ｂとによって形成される。そのため、歯車部１０と支持部２０との周方向への相対回転が規制される。したがって、歯車部１０と支持部２０との間で回転力を確実に伝達させることができる。 The rod-like protrusion 52a of the gear part 10 is disposed in the hole 52b of the support part 20, and contacts the side surface of the hole 52b. That is, the gear portion 10 and the support portion 20 are formed with contact portions that contact each other in the circumferential direction by the rod-like protrusions 52a and the hole portions 52b. Therefore, the relative rotation of the gear unit 10 and the support unit 20 in the circumferential direction is restricted. Therefore, the rotational force can be reliably transmitted between the gear portion 10 and the support portion 20.
　図５Ａは、連結部４０の断面図であり、図２に対応して示す。図５Ｂは、連結部４０の正面図である。図５Ａ及び図５Ｂに示すように、連結部４０は、外周面４０ｂから径方向外側に突出する環状突部５６ａと、環状突部５６ａから軸方向に突出する複数の棒状突部５７ａと、を有する。 FIG. 5A is a cross-sectional view of the connecting portion 40, corresponding to FIG. FIG. 5B is a front view of the connecting portion 40. As shown in FIGS. 5A and 5B, the connecting portion 40 includes an annular protrusion 56a that protrudes radially outward from the outer peripheral surface 40b, and a plurality of rod-shaped protrusions 57a that protrude in the axial direction from the annular protrusion 56a. Have.
　図４Ａ及び図４Ｂに示すように、支持部２０の内周面２０ａには周方向に延在する環状溝部５６ｂが形成され、環状溝部５６ｂの両側面には軸方向に延在する複数の穴部５７ｂが形成される。 As shown in FIGS. 4A and 4B, an annular groove portion 56b extending in the circumferential direction is formed on the inner peripheral surface 20a of the support portion 20, and a plurality of holes extending in the axial direction are formed on both side surfaces of the annular groove portion 56b. A portion 57b is formed.
　図２に示すように、連結部４０の環状突部５６ａは、支持部２０の環状溝部５６ｂ内に配置され、環状溝部５６ｂの側面と接触する。つまり、連結部４０及び支持部２０には、軸方向に互いに接触する接触部（第１接触部）が環状突部５６ａと環状溝部５６ｂとによって形成される。そのため、連結部４０と支持部２０との軸方向への相対移動が規制される。したがって、連結部４０と支持部２０とが分離するのを防止することができる。 As shown in FIG. 2, the annular protrusion 56a of the connecting portion 40 is disposed in the annular groove portion 56b of the support portion 20, and contacts the side surface of the annular groove portion 56b. That is, the contact portion (first contact portion) that contacts each other in the axial direction is formed in the coupling portion 40 and the support portion 20 by the annular protrusion 56a and the annular groove portion 56b. Therefore, the relative movement in the axial direction between the connecting portion 40 and the support portion 20 is restricted. Therefore, it can prevent that the connection part 40 and the support part 20 isolate | separate.
　連結部４０の棒状突部５７ａは、支持部２０の穴部５７ｂ内に配置され、穴部５７ｂの側面と接触する。つまり、連結部４０及び支持部２０には、周方向に互いに接触する接触部（第２接触部）が棒状突部５７ａと穴部５７ｂとによって形成される。そのため、連結部４０と支持部２０との周方向への相対回転が規制される。したがって、連結部４０と支持部２０との間で回転力を確実に伝達させることができる。 The rod-like protrusion 57a of the connecting part 40 is disposed in the hole 57b of the support part 20 and contacts the side surface of the hole 57b. That is, a contact portion (second contact portion) that contacts each other in the circumferential direction is formed in the connecting portion 40 and the support portion 20 by the rod-shaped protrusion 57a and the hole portion 57b. Therefore, relative rotation in the circumferential direction between the connecting portion 40 and the support portion 20 is restricted. Therefore, the rotational force can be reliably transmitted between the connecting portion 40 and the support portion 20.
　ギヤ１００では、環状突部５１ａは、歯車部１０の全周に亘って形成され、環状溝部５１ｂは、支持部２０の全周に亘って形成される。環状突部５１ａは、周方向に部分的に形成されていてもよい。この場合、環状溝部５１ｂは、環状突部５１ａに対応して周方向に部分的に形成されていてもよい。 In the gear 100, the annular protrusion 51 a is formed over the entire circumference of the gear section 10, and the annular groove 51 b is formed over the entire circumference of the support section 20. The annular protrusion 51a may be partially formed in the circumferential direction. In this case, the annular groove 51b may be partially formed in the circumferential direction corresponding to the annular protrusion 51a.
　同様に、環状突部５６ａは、連結部４０の全周に亘って形成され、環状溝部５６ｂは、支持部２０の全周に亘って形成される。環状突部５６ａは、周方向に部分的に形成されていてもよい。この場合、環状溝部５６ｂは、環状突部５６ａに対応して周方向に部分的に形成されていてもよい。 Similarly, the annular protrusion 56 a is formed over the entire periphery of the connecting portion 40, and the annular groove portion 56 b is formed over the entire periphery of the support portion 20. The annular protrusion 56a may be partially formed in the circumferential direction. In this case, the annular groove 56b may be partially formed in the circumferential direction corresponding to the annular protrusion 56a.
　また、ギヤ１００では、棒状突部５２ａは、環状突部５１ａの両側に設けられ、穴部５２ｂは、環状溝部５１ｂの両側面に設けられる。棒状突部５２ａは、環状突部５１ａの片側のみに設けられていてもよい。この場合、穴部５２ｂは、棒状突部５２ａに対応して環状溝部５１ｂの片側側面にのみ設けられていてもよい。 Further, in the gear 100, the rod-shaped protrusions 52a are provided on both sides of the annular protrusion 51a, and the hole parts 52b are provided on both side surfaces of the annular groove 51b. The rod-shaped protrusion 52a may be provided only on one side of the annular protrusion 51a. In this case, the hole 52b may be provided only on one side surface of the annular groove 51b corresponding to the rod-shaped protrusion 52a.
　同様に、棒状突部５７ａは、環状突部５６ａの両側に設けられ、穴部５７ｂは、環状溝部５６ｂの両側面に設けられる。棒状突部５７ａは、環状突部５６ａの片側のみに設けられていてもよい。この場合、穴部５７ｂは、棒状突部５７ａに対応して環状溝部５６ｂの片側側面にのみ設けられていてもよい。 Similarly, the rod-shaped protrusion 57a is provided on both sides of the annular protrusion 56a, and the hole 57b is provided on both sides of the annular groove 56b. The rod-shaped protrusion 57a may be provided only on one side of the annular protrusion 56a. In this case, the hole portion 57b may be provided only on one side surface of the annular groove portion 56b corresponding to the rod-shaped protrusion 57a.
　環状突部５１ａは、歯車部１０の内周面１０ａに代えて、支持部２０の外周面２０ｂに形成されていてもよい。この場合、環状溝部５１ｂは、支持部２０の外周面２０ｂに代えて、歯車部１０の内周面１０ａに形成される。 The annular protrusion 51 a may be formed on the outer peripheral surface 20 b of the support portion 20 instead of the inner peripheral surface 10 a of the gear portion 10. In this case, the annular groove portion 51 b is formed on the inner peripheral surface 10 a of the gear portion 10 instead of the outer peripheral surface 20 b of the support portion 20.
　同様に、環状突部５６ａは、連結部４０の外周面４０ｂに代えて、支持部２０の内周面２０ａに形成されていてもよい。この場合、環状溝部５６ｂは、支持部２０の内周面２０ａに代えて、連結部４０の外周面４０ｂに形成される。 Similarly, the annular protrusion 56 a may be formed on the inner peripheral surface 20 a of the support portion 20 instead of the outer peripheral surface 40 b of the connecting portion 40. In this case, the annular groove portion 56 b is formed on the outer peripheral surface 40 b of the connecting portion 40 instead of the inner peripheral surface 20 a of the support portion 20.
　棒状突部５２ａは、環状突部５１ａに代えて、環状溝部５１ｂの側面に設けられていてもよい。この場合、穴部５２ｂは、環状溝部５１ｂの側面に代えて、環状突部５１ａの側面に形成される。 The rod-like protrusion 52a may be provided on the side surface of the annular groove 51b instead of the annular protrusion 51a. In this case, the hole 52b is formed on the side surface of the annular protrusion 51a in place of the side surface of the annular groove 51b.
　同様に、棒状突部５７ａは、環状突部５６ａに代えて、環状溝部５６ｂの側面に設けられていてもよい。この場合、穴部５７ｂは、環状溝部５６ｂの側面に代えて、環状突部５６ａの側面に形成される。 Similarly, the rod-like protrusion 57a may be provided on the side surface of the annular groove 56b instead of the annular protrusion 56a. In this case, the hole portion 57b is formed on the side surface of the annular protrusion 56a instead of the side surface of the annular groove portion 56b.
　次に、ギヤ１００の製造方法について、図６から図８を参照して説明する。ギヤ１００は、金型に溶融材料を充填することによって製造されるが、図６から図８では、金型の図示を省略している。 Next, a method for manufacturing the gear 100 will be described with reference to FIGS. The gear 100 is manufactured by filling a mold with a molten material, but the mold is not shown in FIGS. 6 to 8.
　まず、図６に示すように、予め成形された芯部３０を金型内に配置する。繊維補強材が配合されていない樹脂を金型内に充填し、歯車部１０及び連結部４０を成形する。このとき、芯部３０の外周面３０ｂと連結部４０の内周面４０ａとが固着する。 First, as shown in FIG. 6, a core 30 formed in advance is placed in a mold. The gear portion 10 and the connecting portion 40 are molded by filling the mold with a resin not containing a fiber reinforcing material. At this time, the outer peripheral surface 30b of the core part 30 and the inner peripheral surface 40a of the connection part 40 adhere.
　連結部４０には、金型のゲートに対応して樹脂部７１が形成される。歯車部１０と連結部４０とは、金型の形状に対応して形成される樹脂部７２を介して連結されている。 In the connecting part 40, a resin part 71 is formed corresponding to the gate of the mold. The gear part 10 and the connection part 40 are connected via a resin part 72 formed corresponding to the shape of the mold.
　樹脂が固化したところで歯車部１０、連結部４０及び芯部３０を金型から取り外し、歯車部１０と連結部４０とを分離する。具体的には、図７に示すように、不要な樹脂部７１，７２を成形後の歯車部１０及び連結部４０から除去する。連結部４０と芯部３０とは固着されたままである。 When the resin is solidified, the gear part 10, the connecting part 40, and the core part 30 are removed from the mold, and the gear part 10 and the connecting part 40 are separated. Specifically, as shown in FIG. 7, unnecessary resin portions 71 and 72 are removed from the molded gear portion 10 and the connecting portion 40. The connecting part 40 and the core part 30 remain fixed.
　次に、図８に示すように、歯車部１０と、連結部４０と、芯部３０と、を別の金型に配置する。繊維強化樹脂を金型内（歯車部１０と連結部４０との間）に充填し、支持部２０を形成する。支持部２０には、金型のゲートに対応して樹脂部７３が形成される。 Next, as shown in FIG. 8, the gear portion 10, the connecting portion 40, and the core portion 30 are arranged in different molds. The fiber reinforced resin is filled in the mold (between the gear portion 10 and the connecting portion 40) to form the support portion 20. A resin part 73 is formed on the support part 20 corresponding to the gate of the mold.
　繊維強化樹脂が固化したところで歯車部１０、支持部２０、連結部４０及び芯部３０を金型から取り外す。不要な樹脂部７３を支持部２０から除去することによって、ギヤ１００が完成する。 When the fiber reinforced resin is solidified, the gear unit 10, the support unit 20, the connection unit 40, and the core unit 30 are removed from the mold. By removing the unnecessary resin portion 73 from the support portion 20, the gear 100 is completed.
　本実施形態に係る製造方法では、樹脂を金型内に充填して歯車部１０と連結部４０とを同時に成形するので、歯車部１０と連結部４０とが同じ工程で形成される。歯車部１０と連結部４０とを別々の工程で形成しなくて済み、ギヤ１００の製造における工数を削減することができる。 In the manufacturing method according to the present embodiment, the gear portion 10 and the connecting portion 40 are formed in the same process because the gear portion 10 and the connecting portion 40 are simultaneously molded by filling the resin in the mold. The gear portion 10 and the connecting portion 40 need not be formed in separate steps, and the number of steps in manufacturing the gear 100 can be reduced.
　以上の実施形態によれば、以下に示す作用効果を奏する。 According to the above embodiment, the following effects are exhibited.
　ギヤ１００では、繊維強化樹脂で支持部２０が形成され繊維強化樹脂よりも弾性率の低い樹脂で連結部４０が形成される。ギヤ１００のホイール歯１１がウォームシャフト６のシャフト歯６ｂ（図１参照）と当たるときに生じる振動は、支持部２０から連結部４０を通じて減衰しながら芯部３０に伝わる。したがって、芯部３０の振動を防止することができ、シャフト歯６ｂとホイール歯１１とが当たるときに生じる異音を低減させることができる。 In the gear 100, the support portion 20 is formed of a fiber reinforced resin, and the connecting portion 40 is formed of a resin having a lower elastic modulus than the fiber reinforced resin. The vibration generated when the wheel teeth 11 of the gear 100 hit the shaft teeth 6 b (see FIG. 1) of the worm shaft 6 is transmitted from the support portion 20 to the core portion 30 while being attenuated through the connecting portion 40. Therefore, the vibration of the core part 30 can be prevented, and abnormal noise generated when the shaft teeth 6b and the wheel teeth 11 come into contact with each other can be reduced.
　連結部４０及び支持部２０には、軸方向に互いに接触する接触部が環状突部５６ａと環状溝部５６ｂとによって形成される。そのため、連結部４０と支持部２０との軸方向への相対移動が規制される。したがって、連結部４０と支持部２０とが分離するのを防止することができる。 In the connecting portion 40 and the support portion 20, a contact portion that contacts each other in the axial direction is formed by the annular protrusion 56a and the annular groove portion 56b. Therefore, the relative movement in the axial direction between the connecting portion 40 and the support portion 20 is restricted. Therefore, it can prevent that the connection part 40 and the support part 20 isolate | separate.
　連結部４０及び支持部２０には、周方向に互いに接触する接触部（第２接触部）が棒状突部５７ａと穴部５７ｂとによって形成される。そのため、連結部４０と支持部２０との周方向への相対回転が規制される。したがって、連結部４０と支持部２０との間で回転力を確実に伝達させることができる。 In the connecting portion 40 and the support portion 20, a contact portion (second contact portion) that contacts each other in the circumferential direction is formed by a rod-shaped protrusion 57a and a hole portion 57b. Therefore, relative rotation in the circumferential direction between the connecting portion 40 and the support portion 20 is restricted. Therefore, the rotational force can be reliably transmitted between the connecting portion 40 and the support portion 20.
　また、歯車部１０と連結部４０とが同じ材料で形成される。歯車部１０を成形する工程と同じ工程で連結部４０を成形すればよく、歯車部１０と連結部４０とを別々の工程で成形しなくて済む。ギヤ１００の製造における工数を減らすことができ、ギヤ１００を安価に製造することができる。 Further, the gear part 10 and the connecting part 40 are formed of the same material. The connecting part 40 may be formed in the same process as the process of forming the gear part 10, and the gear part 10 and the connecting part 40 need not be formed in separate processes. Man-hours in manufacturing the gear 100 can be reduced, and the gear 100 can be manufactured at low cost.
　以下、本発明の実施形態の構成、作用、及び効果をまとめて説明する。 Hereinafter, the configuration, operation, and effect of the embodiment of the present invention will be described together.
　本実施形態では、ギヤ１００は、外周にホイール歯１１を有する環状の歯車部１０と、歯車部１０の内周面１０ａに設けられ歯車部１０を支持する環状の樹脂製の支持部２０と、支持部２０の内側に支持部２０の内周面２０ａと間隔を空けて設けられる金属製の芯部３０と、支持部２０の内周面２０ａと芯部３０の外周面３０ｂとの間に設けられ支持部２０と芯部３０とを連結する環状の連結部４０と、を備え、連結部４０は、支持部２０よりも弾性率の低い樹脂で形成される。 In the present embodiment, the gear 100 includes an annular gear portion 10 having wheel teeth 11 on the outer periphery, an annular resin support portion 20 that is provided on the inner peripheral surface 10a of the gear portion 10 and supports the gear portion 10; Provided between the inner peripheral surface 20a of the support portion 20 and the metallic core portion 30 provided at a distance from the inner peripheral surface 20a of the support portion 20, and between the inner peripheral surface 20a of the support portion 20 and the outer peripheral surface 30b of the core portion 30. And an annular connecting portion 40 that connects the support portion 20 and the core portion 30, and the connecting portion 40 is formed of a resin having a lower elastic modulus than the support portion 20.
　この形態では、芯部３０と支持部２０とが連結部４０によって連結され連結部４０が支持部２０よりも弾性率の低い樹脂で形成されるので、ギヤ１００のホイール歯１１がウォームシャフト６のシャフト歯６ｂに当たるときに生じる振動は、連結部４０を通じて減衰しながら芯部３０に伝わる。したがって、芯部３０の振動を防止することができ、ホイール歯１１とシャフト歯６ｂとが当たるときに生じる異音を低減させることができる。 In this embodiment, since the core part 30 and the support part 20 are connected by the connection part 40 and the connection part 40 is formed of a resin having a lower elastic modulus than the support part 20, the wheel teeth 11 of the gear 100 are connected to the worm shaft 6. The vibration generated when hitting the shaft teeth 6 b is transmitted to the core portion 30 while being attenuated through the connecting portion 40. Therefore, the vibration of the core part 30 can be prevented, and the noise generated when the wheel teeth 11 and the shaft teeth 6b come into contact with each other can be reduced.
　また、本実施形態では、連結部４０は、歯車部１０と同じ材料で形成される。 In the present embodiment, the connecting portion 40 is formed of the same material as the gear portion 10.
　この形態では、歯車部１０が連結部４０と同じ材料で形成されるので、歯車部１０と連結部４０とを同じ工程で形成すればよく、歯車部１０と連結部４０とを別々の工程で形成しなくて済む。したがって、ギヤ１００の製造における工数を削減することができる。 In this embodiment, since the gear part 10 is formed of the same material as that of the connecting part 40, the gear part 10 and the connecting part 40 may be formed in the same process, and the gear part 10 and the connecting part 40 are formed in separate processes. It does not have to be formed. Therefore, the man-hour in manufacturing the gear 100 can be reduced.
　また、本実施形態では、支持部２０と連結部４０とは、軸方向に互いに接触する環状突部５６ａ及び環状溝部５６ｂを有する。 Moreover, in this embodiment, the support part 20 and the connection part 40 have the annular protrusion 56a and the annular groove part 56b which mutually contact in an axial direction.
　この形態では、支持部２０と連結部４０が軸方向に接触する環状突部５６ａ及び環状溝部５６ｂを有するので、支持部２０と連結部４０との軸方向への相対移動が規制される。したがって、支持部２０と連結部４０とが分離するのを防止することができる。 In this embodiment, since the support portion 20 and the connecting portion 40 have the annular protrusion 56a and the annular groove portion 56b that contact in the axial direction, the relative movement in the axial direction between the support portion 20 and the connecting portion 40 is restricted. Therefore, it can prevent that the support part 20 and the connection part 40 isolate | separate.
　また、本実施形態では、支持部２０と連結部４０とは、周方向に互いに接触する棒状突部５７ａ及び穴部５７ｂを有する。 Moreover, in this embodiment, the support part 20 and the connection part 40 have the rod-shaped protrusion part 57a and the hole part 57b which mutually contact in the circumferential direction.
　この形態では、支持部２０と連結部４０が周方向に接触する棒状突部５７ａ及び穴部５７ｂを有するので、支持部２０と連結部４０との相対回転が規制される。したがって、歯車部１０と芯部３０との間で回転力を確実に伝達させることができる。 In this embodiment, since the support portion 20 and the connecting portion 40 have the rod-like protrusions 57a and the hole portions 57b that contact in the circumferential direction, the relative rotation between the support portion 20 and the connecting portion 40 is restricted. Therefore, the rotational force can be reliably transmitted between the gear portion 10 and the core portion 30.
　また、本実施形態は、ギヤ１００を製造する方法に係り、金型内に芯部３０を配置し樹脂を金型内に充填して歯車部１０と連結部４０とを成形する工程と、歯車部１０と連結部４０との間に連結部４０より弾性率の高い樹脂を充填して支持部２０を成形する工程と、を備える。 In addition, the present embodiment relates to a method of manufacturing the gear 100, the step of arranging the core portion 30 in the mold and filling the mold with resin to form the gear portion 10 and the connecting portion 40, and the gear. A step of filling the portion 10 and the connecting portion 40 with a resin having a higher elastic modulus than the connecting portion 40 and molding the support portion 20.
　この形態では、樹脂を金型内に充填して歯車部１０と連結部４０とを成形するので、歯車部１０と連結部４０とが同じ工程で形成される。歯車部１０と連結部４０とを別々の工程で形成しなくて済み、ギヤ１００の製造における工数を削減することができる。 In this embodiment, since the gear portion 10 and the connecting portion 40 are formed by filling the mold with resin, the gear portion 10 and the connecting portion 40 are formed in the same process. The gear portion 10 and the connecting portion 40 need not be formed in separate steps, and the number of steps in manufacturing the gear 100 can be reduced.
　以上、本発明の実施形態について説明したが、上記実施形態は本発明の適用例の一部を示したに過ぎず、本発明の技術的範囲を上記実施形態の具体例に限定する趣旨ではない。 As mentioned above, although embodiment of this invention was described, the said embodiment showed only a part of application example of this invention, and is not the meaning which limits the technical scope of this invention to the specific example of said embodiment. .
　例えば、上記実施形態では、歯車部１０と連結部４０とが同じ樹脂で形成されているが、歯車部１０と連結部４０とが異なる樹脂で形成されていてもよい。 For example, in the above embodiment, the gear portion 10 and the connecting portion 40 are formed of the same resin, but the gear portion 10 and the connecting portion 40 may be formed of different resins.
　また、上記実施形態では、連結部４０が樹脂で形成されているが、連結部４０は、樹脂以外の材料、例えば、ゴムや接着剤で形成されていてもよく、支持部２０に用いられる繊維強化樹脂よりも弾性率の低い材料で形成されていればよい。 Moreover, in the said embodiment, although the connection part 40 is formed with resin, the connection part 40 may be formed with materials other than resin, for example, rubber | gum and an adhesive agent, and the fiber used for the support part 20 is used. What is necessary is just to be formed with the material whose elastic modulus is lower than reinforced resin.
　また、上記実施形態では、ウォームシャフト６と噛み合うギヤ（ウォームホイール）１００について説明したが、互いに噛み合うギヤに本発明を適用してもよい。 In the above embodiment, the gear (worm wheel) 100 that meshes with the worm shaft 6 has been described, but the present invention may be applied to gears that mesh with each other.
　本願は２０１６年７月２７日に日本国特許庁に出願された特願２０１６－１４７５８９に基づく優先権を主張し、この出願の全ての内容は参照により本明細書に組み込まれる。 This application claims priority based on Japanese Patent Application No. 2016-147589 filed with the Japan Patent Office on July 27, 2016, the entire contents of which are incorporated herein by reference.

Claims (5)

  1. 　ギヤであって、
    　外周に歯を有する環状の歯車部と、
    　前記歯車部の内周面に設けられ前記歯車部を支持する環状の樹脂製の支持部と、
    　前記支持部の内側に前記支持部の内周面と間隔を空けて設けられる金属製の芯部と、
    　前記支持部の内周面と前記芯部の外周面との間に設けられ前記支持部と前記芯部とを連結する環状の連結部と、を備え、
    　前記連結部は、前記支持部よりも弾性率の低い樹脂で形成される
    ギヤ。     A gear,
    An annular gear portion having teeth on the outer periphery;
    An annular resin support portion that is provided on the inner peripheral surface of the gear portion and supports the gear portion;
    A metal core provided on the inner side of the support portion and spaced from the inner peripheral surface of the support portion;
    An annular connecting portion provided between an inner peripheral surface of the support portion and an outer peripheral surface of the core portion, and connecting the support portion and the core portion;
    The connection part is a gear formed of a resin having a lower elastic modulus than the support part.
  2. 　請求項１に記載のギヤであって、
    　前記連結部は、前記歯車部と同じ材料で形成される
    ギヤ。     The gear according to claim 1,
    The connecting portion is a gear formed of the same material as the gear portion.
  3. 　請求項１に記載のギヤであって、
    　前記支持部と前記連結部とは、軸方向に互いに接触する第１接触部を有する
    ギヤ。     The gear according to claim 1,
    The support part and the connection part have a first contact part that contacts each other in the axial direction.
  4. 　請求項１に記載のギヤであって、
    　前記支持部と前記連結部とは、周方向に互いに接触する第２接触部を有する
    ギヤ。     The gear according to claim 1,
    The support part and the connection part have a second contact part that contacts each other in the circumferential direction.
  5. 　環状の歯車部と、前記歯車部の内周面に設けられ前記歯車部を支持する環状の支持部と、前記支持部の内側に設けられる芯部と、前記支持部の内周面と前記芯部の外周面との間に設けられ前記支持部と前記芯部とを連結する環状の連結部と、を備えるギヤを製造する方法であって、
    　金型内に前記芯部を配置し樹脂を前記金型内に充填して前記歯車部と前記連結部とを成形する工程と、
    　前記歯車部と前記連結部との間に前記連結部より弾性率の高い樹脂を充填して前記支持部を成形する工程と、を備える
    ギヤの製造方法。     An annular gear portion; an annular support portion provided on an inner peripheral surface of the gear portion for supporting the gear portion; a core portion provided on the inner side of the support portion; an inner peripheral surface of the support portion; An annular connecting portion provided between the outer peripheral surface of the portion and connecting the support portion and the core portion, and a method of manufacturing a gear,
    Placing the core part in a mold and filling the mold with resin to form the gear part and the connecting part;
    Filling the resin having a higher elastic modulus than the connecting portion between the gear portion and the connecting portion, and molding the support portion.
PCT/JP2017/026543 2016-07-27 2017-07-21 Gear and method for manufacturing gear WO2018021194A1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110030364A (en) * 2019-04-19 2019-07-19 浙江美亚特精密机械有限公司 A kind of multiple field metal/resin gear and its manufacturing process and purposes
WO2021049533A1 (en) * 2019-09-11 2021-03-18 株式会社日栄 Resin molded product and resin molded gear
US20220228656A1 (en) * 2021-01-15 2022-07-21 Jtekt Corporation Toothed pulley

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7441049B2 (en) * 2020-01-15 2024-02-29 カヤバ株式会社 Gear manufacturing method

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JPS54183553U (en) * 1978-06-16 1979-12-26
JPS5891046U (en) * 1981-12-15 1983-06-20 株式会社　長谷川鉄工所 gear
JP2003207029A (en) * 2002-01-11 2003-07-25 Koyo Seiko Co Ltd Reduction gear system and electric power steering device
JP2009041683A (en) * 2007-08-09 2009-02-26 Toyoda Gosei Co Ltd Resinous worm wheel

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Publication number Priority date Publication date Assignee Title
JPS54183553U (en) * 1978-06-16 1979-12-26
JPS5891046U (en) * 1981-12-15 1983-06-20 株式会社　長谷川鉄工所 gear
JP2003207029A (en) * 2002-01-11 2003-07-25 Koyo Seiko Co Ltd Reduction gear system and electric power steering device
JP2009041683A (en) * 2007-08-09 2009-02-26 Toyoda Gosei Co Ltd Resinous worm wheel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110030364A (en) * 2019-04-19 2019-07-19 浙江美亚特精密机械有限公司 A kind of multiple field metal/resin gear and its manufacturing process and purposes
WO2021049533A1 (en) * 2019-09-11 2021-03-18 株式会社日栄 Resin molded product and resin molded gear
US20220228656A1 (en) * 2021-01-15 2022-07-21 Jtekt Corporation Toothed pulley

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