WO2018116927A1 - Shaft hole structure for resin rotation transmission member - Google Patents

Shaft hole structure for resin rotation transmission member Download PDF

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Publication number
WO2018116927A1
WO2018116927A1 PCT/JP2017/044681 JP2017044681W WO2018116927A1 WO 2018116927 A1 WO2018116927 A1 WO 2018116927A1 JP 2017044681 W JP2017044681 W JP 2017044681W WO 2018116927 A1 WO2018116927 A1 WO 2018116927A1
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WIPO (PCT)
Prior art keywords
shaft
rotation transmission
hole
transmission member
resin
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PCT/JP2017/044681
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French (fr)
Japanese (ja)
Inventor
酒巻　和幸
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株式会社エンプラス
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Publication of WO2018116927A1 publication Critical patent/WO2018116927A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end

Definitions

  • the present invention relates to a shaft hole structure of a resin rotation transmission member that eliminates rattling of a fitting portion between the shaft hole of the resin rotation transmission member and the rotation transmission shaft.
  • a rotation transmission member such as a gear is rotated integrally with a rotation transmission shaft (drive shaft or driven shaft). Therefore, the rotation transmission shaft has a D-cut shaft portion (on the axis of the rotation transmission shaft).
  • a shaft section having a D-shaped cross section orthogonal to the D-cut hole is formed in the rotation transmission member (a hole having a D-shaped cross section perpendicular to the rotation axis of the rotation transmission member). Is formed.
  • the rotation transmission shaft and the rotation transmission member are rotated relative to each other between the shaft-side flat surface of the D-cut shaft portion and the hole-side flat surface of the D-cut hole by fitting the D-cut shaft portion and the D-cut hole. The movement is prevented (see Patent Documents 1 and 2).
  • Japanese Utility Model Publication No. 2-80251 (refer to the description of FIGS. 1 and 2) Japanese Patent No. 5030555 (see paragraph number 0032, paragraph number 0036, and description of FIG. 2)
  • the rotation transmission shaft 100 and the rotation transmission member 101 have a fitting gap ⁇ between the D-cut shaft portion and the D-cut hole, rattling occurs in the fitting portion between the D-cut shaft portion and the D-cut hole. An error is generated.
  • the rotation transmission shaft 100 and the rotation transmission member 101 have a fitting clearance ⁇ between the D-cut shaft portion 102 and the D-cut hole 103, when starting rotation, when stopping rotation, and reverse rotation.
  • the end portions 104a and 104b of the shaft-side flat surface 104 of the D-cut shaft portion 102 collide with the hole-side flat surface 105 of the D-cut hole 103 to generate a collision sound.
  • the present invention provides a shaft hole structure of a resin rotation transmission member that can prevent the occurrence of a rotation transmission error due to rattling of the fitting portion with the rotation transmission shaft and the occurrence of a collision sound.
  • the present invention relates to a shaft hole structure of the resin rotation transmission member 1 fitted to the rotation transmission shaft 2.
  • the rotation transmission shaft 2 is formed with a shaft-side flat surface 6 extending along the axial direction at the shaft end portion 3 fitted in the shaft hole 4 of the resin rotation transmission member 1.
  • the shaft hole 4 of the resin rotation transmission member 1 is formed with a hole side flat surface 13 that faces the shaft side flat surface 6 of the rotation transmission shaft 2.
  • the hole-side flat surface 13 has linear protrusions 17 deformed by the shaft end portion 3 when the shaft end portion 3 of the rotation transmission shaft 2 is fitted into the shaft hole 4. It is formed so as to extend along the fitting direction of the end 3.
  • the linear protrusion 17 gradually increases the protrusion height of the tip end portion on the side where the shaft end portion 3 is inserted into the shaft hole 4 along the fitting direction of the shaft end portion 3.
  • the linear protrusion formed on the hole side flat surface of the shaft rotation hole of the resin rotation transmission member rotates. Deformed at the shaft end of the transmission shaft, the linear protrusion partially fills the gap between the hole-side flat surface of the shaft hole and the shaft-side flat surface of the shaft end, and the shaft hole and the shaft end are fitted. Shaking of the joint is prevented.
  • the present invention can prevent the occurrence of a rotation transmission error and the occurrence of a collision sound due to the rattling of the fitting portion between the shaft hole and the shaft end.
  • FIG. 1A is a side view of the shaft end portion of the rotation transmission shaft (drive shaft or driven shaft), and FIG. 1B is a front view of the rotation transmission shaft.
  • 2A is a front view of the resin rotation transmission member
  • FIG. 2B is a cross-sectional view taken along the line A1-A1 of FIG. 2A.
  • FIG. 3A is a cross-sectional view of a fitting portion between the shaft end portion of the rotation transmission shaft and the shaft hole of the resin rotation transmission member
  • FIG. 3B is an enlarged view of a part of FIG. FIG. It is a figure for demonstrating the shaft hole structure of the resin-made rotation transmission member which concerns on the modification 1 of 1st Embodiment, and is a front view of a resin-made rotation transmission member.
  • FIG.7 (a) is a front view of a resin-made rotation transmission member
  • FIG.7 (b) is a figure.
  • FIG. 7A is a cross-sectional view taken along line A2-A2 in FIG.
  • FIG.8 (a) is a front view of a resin-made rotation transmission member
  • FIG.8 (b) is a figure.
  • FIG. 8A is a cross-sectional view taken along line A3-A3 in FIG.
  • Fig.9 (a) is a front view of the resin-made rotation transmission member 1
  • FIG.9 (b) is FIG. It is sectional drawing of the fitting part of the shaft end part of a rotation transmission shaft, and the shaft hole of resin-made rotation transmission members.
  • FIG.10 (a) is a side view of the axial end part of a rotation transmission shaft (a drive shaft or a driven shaft).
  • FIG. 10B is a front view of the rotation transmission shaft.
  • FIG. 11A is a front view of a resin rotation transmission member
  • FIG. 11B is a cross-sectional view taken along line A4-A4 of FIG. 11A.
  • 12A is a cross-sectional view of a fitting portion between the shaft end portion of the rotation transmission shaft and the shaft hole of the resin rotation transmission member
  • FIG. 12B is an enlarged view of a part of FIG. FIG.
  • FIGS. 1 to 3 are views for explaining a shaft hole structure of the resin rotation transmission member 1 according to the first embodiment of the present invention.
  • 1A is a side view of the shaft end portion 3 of the rotation transmission shaft 2 (drive shaft or driven shaft)
  • FIG. 1B is a front view of the rotation transmission shaft 2.
  • 2A is a front view of the resin rotation transmission member 1
  • FIG. 2B is a cross-sectional view taken along the line A1-A1 of FIG. 2A.
  • 3A is a cross-sectional view of a fitting portion between the shaft end 3 of the rotation transmission shaft 2 and the shaft hole 4 of the resin rotation transmission member 1
  • FIG. 3B is a diagram of FIG. 3A. It is a figure which expands and shows a part of.
  • the rotation transmission shaft 2 is configured such that the shaft end portion 3 is fitted in the shaft hole 4 of the resin rotation transmission member 1.
  • the shaft end portion 3 of the rotation transmission shaft 2 has a D-shaped cross section perpendicular to the axial direction (the direction in which the axis 5 extends), and the shaft-side flat surface 6 extending along the axial direction cuts out the round bar. Is formed.
  • the rotation transmission member 1 made of resin has a worm 8 formed on the outer peripheral side of a boss 7 in which a bottomed shaft hole 4 is formed so that the worm 8 meshes with a worm wheel not shown. It has become.
  • the resin rotation transmission member 1 is molded by injecting a molten synthetic resin material (polyacetal (POM), polyamide (PA), etc.) into a cavity of a mold.
  • the shaft hole 4 is formed along the rotation axis 10, and an opening end side shaft hole portion 11 and a hole bottom side shaft hole portion 12 are formed.
  • the opening end side shaft hole portion 11 is a round hole having a circular cross-section perpendicular to the rotation axis 10.
  • the hole bottom-side shaft hole portion 12 is a hole having a D-shaped cross-section perpendicular to the rotation axis 10 (hereinafter, abbreviated as a D-shaped hole), and the shaft end 3 fitted in the shaft hole 4 has a shaft.
  • a hole side flat surface 13 facing the side flat surface 6 is formed.
  • the hole side flat surface 13 is smoothly connected to the inner peripheral surface of the opening end side shaft hole portion (round hole) 11 by the inclined surface 14. Thereby, the shaft end portion 3 of the rotation transmission shaft 2 inserted into the opening end side shaft hole portion 11 of the shaft hole 4 is guided by the inclined surface 14 and smoothly fitted into the D-shaped hole 12 on the hole bottom 15 side. Match.
  • the hole-side flat surface 13 of the D-shaped hole 12 has a direction along the rotation axis 10 (a direction along the fitting direction of the shaft end portion 3) as a longitudinal direction, and a direction perpendicular to the longitudinal direction has a width.
  • the direction of the line is a position shifted in the longitudinal direction from the inclined surface 14 by a predetermined dimension and a position shifted from the center in the width direction (intersection of the A1-A1 line and the hole side flat surface 13) 16 toward one end in the width direction.
  • a protrusion 17 is formed.
  • the linear protrusion 17 is formed up to the hole bottom 15 along the longitudinal direction, the cross-sectional shape orthogonal to the longitudinal direction is a substantially semicircular shape (see FIG.
  • the tip portion has a protrusion height.
  • the inclined surface 18 gradually increases along the longitudinal direction (toward the hole bottom 15).
  • the linear protrusion 17 is formed from the inclined surface 18 on the shaft-side flat surface 6 of the shaft end 3 when the shaft end 3 of the rotation transmission shaft 2 is fitted into the D-shaped hole 12 of the shaft hole 4. Since it can be gradually deformed, it can be deformed without difficulty.
  • the linear protrusion 17 is not limited to the substantially semicircular cross-sectional shape shown in FIG. 6A, and may have a substantially isosceles triangular cross-sectional shape as shown in FIG. 6B. Moreover, the thing of the cross-sectional shape of a substantially right triangle as shown in FIG.6 (c) may be sufficient.
  • the linear protrusions 17 are not limited to those having the cross-sectional shapes of FIGS. 6A to 6C as long as the same effects as those of the substantially semicircular cross-sectional shape can be obtained.
  • FIG. 3 is an enlarged view showing a fitting portion between the D-shaped shaft end 3 and the D-shaped hole 12.
  • the linear protrusion 17 located on one end side in the width direction of the hole-side flat surface 13 has a gap ⁇ between the D-shaped shaft end 3 and the D-shaped hole 12.
  • the hole-side flat surface 13 is deformed while being deformed at one end in the width direction of the shaft-side flat surface 6 of the shaft end 3.
  • the other end in the width direction of the shaft-side flat surface 6 is brought into contact with the other end in the width direction (a gap is partially filled), and the D-shaped shaft end 3 and the D-shaped hole 12 are fitted.
  • Prevent rattling of the joint As a result, according to the shaft hole structure of the resin rotation transmission member 1 according to the present embodiment, the occurrence of rotation transmission error and the collision sound due to the rattling of the fitting portion between the shaft hole 4 and the shaft end 3. Can be prevented.
  • FIG. 4 is a front view of the resin rotation transmission member 1 according to the first modification.
  • 5 is a cross-sectional view of a fitting portion between the shaft end 3 of the rotation transmission shaft 2 and the shaft hole 4 of the resin rotation transmission member 1, and corresponds to FIG. 3 (a).
  • the pair of linear protrusions 17 are arranged symmetrically with respect to the center 16 in the width direction of the hole side flat surface 13. According to the shaft hole structure of the resin rotation transmission member 1 according to the first modification, the pair of linear protrusions 17 and 17 are uniformly deformed on the shaft-side flat surface 6 of the shaft end portion 3, The pair of deformed linear protrusions 17, 17 fills the gap ( ⁇ ) between the both ends in the width direction of the shaft-side flat surface 6 and the hole-side flat surface 13, so that the shaft end 3 and the shaft hole 4 Shaking of the fitting portion can be prevented.
  • the shaft hole 4 and the shaft end portion are the same as the shaft hole structure of the resin rotation transmission member 1 according to the first embodiment. 3 can prevent the occurrence of rotation transmission error and the occurrence of collision noise due to the rattling of the fitting part.
  • FIG. 7 is a view for explaining the shaft hole structure of the resin rotation transmission member 1 according to the second modification.
  • 7A is a front view of the resin rotation transmission member 1
  • FIG. 7B is a cross-sectional view taken along line A2-A2 of FIG. 7A.
  • the shaft hole 4 passes through the boss 7 along the rotation axis 10, and the bottomed shaft hole 4 is formed in the boss 7.
  • the linear protrusion 17 is formed together with the hole-side flat surface 13 up to the opening end on the right side of the shaft hole 4 as shown in FIG. According to the shaft hole structure of the resin rotation transmission member 1 according to the second modification, the same effect as the shaft hole structure of the resin rotation transmission member 1 according to the first embodiment can be obtained.
  • FIG. 8 is a view for explaining the shaft hole structure of the resin-made rotation transmission member 1 according to the third modification.
  • 8A is a front view of the resin rotation transmission member 1
  • FIG. 8B is a cross-sectional view taken along line A3-A3 of FIG. 8A.
  • the resin rotation transmission member 1 according to the third modification is a spur gear having teeth 20 formed on the outer peripheral side of the boss 7, and the shaft hole 4 penetrates the boss 7 along the rotation axis 10.
  • the shaft end portion 3 can be fitted from either side of both open ends of the shaft hole 4.
  • the resin-made rotation transmission member 1 according to the third modification is configured so that the hole-side flat surface 13 of the shaft hole 4 and the shape of the linear protrusions 17 have the boss 7 as the rotational axis 10. It is formed so as to be bilaterally symmetric with respect to the center line 21 that is divided into two in the direction along the line.
  • the shape of the front side of the shaft hole 4 is the shaft hole of the resin-made rotation transmission member 1 which concerns on 1st Embodiment. 4 is the same as the shape on the front side (see FIG. 2A). According to the shaft hole structure of the resin rotation transmission member 1 according to the third modification, the same effect as the shaft hole structure of the resin rotation transmission member 1 according to the first embodiment can be obtained.
  • FIG. 9 is a view for explaining the shaft hole structure of the resin rotation transmission member 1 according to Modification 4.
  • FIG. 9A is a front view of the resin rotation transmission member 1
  • FIG. b) is a cross-sectional view of a fitting portion between the shaft end portion of the rotation transmission shaft and the shaft hole of the resin rotation transmission member.
  • the resin rotation transmission member 1 shown in FIG. 9 is the same as the resin rotation transmission member 1 according to the first embodiment except for the position where the linear protrusions 17 are formed (FIG. 2A). reference).
  • the linear protrusion 17 is formed at the center 16 in the width direction of the hole-side flat surface 13 of the D-shaped hole 12.
  • the linear protrusion 17 formed on the hole-side flat surface 13 of the shaft hole 4 of the resin rotation transmission member 1 has the rotation transmission shaft. 2
  • the linear protrusion 17 partially fills the gap ( ⁇ ) between the hole-side flat surface 13 of the shaft hole 4 and the shaft-side flat surface 6 of the shaft end 3. Shaking of the fitting portion between the hole 4 and the shaft end 3 is prevented.
  • FIG. 10 to 12 are views for explaining a shaft hole structure of the resin rotation transmission member 1 according to the second embodiment of the present invention.
  • 10A is a side view of the shaft end 3 of the rotation transmission shaft 2 (drive shaft or driven shaft)
  • FIG. 10B is a front view of the rotation transmission shaft 2.
  • 11A is a front view of the resin rotation transmission member 1
  • FIG. 11B is a cross-sectional view taken along line A4-A4 of FIG. 11A.
  • 12A is a cross-sectional view of a fitting portion between the shaft end portion of the rotation transmission shaft and the shaft hole of the resin rotation transmission member
  • FIG. 12B is a part of FIG. 12A.
  • the shaft end portion 3 of the rotation transmission shaft 2 has an oval cross-sectional shape orthogonal to the axial direction (direction in which the shaft center 5 extends), and a pair of shaft sides extending along the axial direction.
  • the flat surfaces 6 and 6 are formed so as to cut out the round bar in parallel along the axial direction.
  • the resin rotation transmission member 1 has a worm 8 formed on the outer peripheral side of a boss 7 in which a bottomed shaft hole 4 is formed, and the worm 8 meshes with a worm wheel (not shown). It has become.
  • the resin rotation transmission member 1 is molded by injecting a molten synthetic resin material (polyacetal (POM), polyamide (PA), etc.) into a cavity of a mold.
  • the shaft hole 4 is formed along the rotation axis 10, and an opening end side shaft hole portion 11 and a hole bottom side shaft hole portion 22 are formed.
  • the opening end side shaft hole portion 11 is a round hole having a circular cross-section perpendicular to the rotation axis 10.
  • the hole bottom side shaft hole portion 22 is a hole whose cross-sectional shape orthogonal to the rotation axis 10 is an oval shape (hereinafter, abbreviated as an oval shape hole), and the shaft end portion 3 fitted in the shaft hole 4.
  • a pair of hole side flat surfaces 13, 13 are formed opposite to the pair of shaft side flat surfaces 6, 6.
  • the hole side flat surfaces 13 and 13 are smoothly connected to the inner peripheral surface of the opening end side shaft hole portion (round hole) 11 by the inclined surface 14.
  • the oval-shaped shaft end portion 3 of the rotation transmission shaft 2 inserted into the opening end side shaft hole portion 11 located on the opening end side of the shaft hole 4 is guided by the inclined surface 14, and the hole bottom 15. Fits smoothly into the oval-shaped hole 22 on the side.
  • the hole-side flat surfaces 13, 13 of the oval-shaped hole 22 have a direction along the rotation axis 10 (a direction along the fitting direction of the shaft end 3) as a longitudinal direction, and are orthogonal to the longitudinal direction.
  • linear protrusions 17 and 17 are formed at positions shifted from the inclined surface 14 in the longitudinal direction by a predetermined dimension and at positions shifted from the width direction center 16 toward one end in the width direction.
  • the pair of linear protrusions 17 and 17 are formed at positions where a virtual straight line connecting one linear protrusion 17 and the other linear protrusion 17 passes through the center of the shaft hole 4 (rotation axis 10).
  • the pair of linear protrusions 17 and 17 are formed to the hole bottom 15 along the longitudinal direction, and the cross-sectional shape orthogonal to the longitudinal direction is a substantially semicircular shape (see FIG. 6A), and the tip The portion is an inclined surface 18 that gradually increases the protrusion height along the longitudinal direction (toward the hole bottom).
  • the linear protrusions 17 are inclined surfaces 18 on the shaft-side flat surface 6 of the shaft end portion 3 when the shaft end portion 3 of the rotation transmission shaft 2 is fitted into the oval shape hole 22 of the shaft hole 4. Since it can be gradually deformed from, it can be deformed without difficulty.
  • the linear protrusion 17 is not limited to the substantially semicircular cross-sectional shape shown in FIG. 6A, and may have a substantially isosceles triangular cross-sectional shape as shown in FIG. 6B. Alternatively, it may have a substantially right triangle cross section as shown in FIG.
  • the linear protrusions 17 are not limited to those having the cross-sectional shapes of FIGS. 6A to 6C as long as the same effects as those of the substantially semicircular cross-sectional shape can be obtained.
  • FIG. 12 is an enlarged view of a fitting portion between the oval-shaped shaft end 3 and the oval-shaped hole 22.
  • the linear protrusion 17 located on one end side in the width direction of the hole-side flat surface 13 is formed between the shaft-side flat surface 6 of the oval-shaped shaft end portion 3 and the oval-shaped hole 22.
  • the other end portion in the width direction of the shaft-side flat surface 6 is brought into contact with the other end portion in the width direction of the hole-side flat surface 13 while being deformed on one end portion side, and the shaft end portion 3 having an oval shape is formed. And rattling of the fitting portion between the oval-shaped hole 22 and the oblong shape hole 22 are prevented.
  • the shaft hole structure of the resin rotation transmission member 1 according to the present embodiment the occurrence of rotation transmission error and the collision sound due to the rattling of the fitting portion between the shaft hole 4 and the shaft end 3. Can be prevented.
  • FIG.13 and FIG.14 is a figure for demonstrating the shaft hole structure of the resin-made rotation transmission members 1 which concern on the modification 1 of 2nd Embodiment.
  • FIG. 13 is a front view of the resin rotation transmission member 1 according to the first modification.
  • FIG. 14 is a cross-sectional view of a fitting portion between the shaft end portion 3 of the rotation transmission shaft 2 and the shaft hole 4 of the resin rotation transmission member 1, and corresponds to FIG.
  • the pair of linear protrusions 17, 17 are arranged symmetrically with respect to one width direction center 16 of the pair of hole side flat surfaces 13, 13.
  • the pair of linear protrusions 17 and 17 are arranged symmetrically with respect to the other center 16 in the width direction of the pair of hole-shaped flat surfaces 13 and 13.
  • the pair of linear protrusions 17 and 17 formed on one of the pair of hole-side flat surfaces 13 and 13 have shaft end portions.
  • the pair of linear projections 17 and 17 formed on the other of the pair of hole-side flat surfaces 13 and 13 are uniformly deformed by one of the pair of shaft-side flat surfaces 6 and 6.
  • a pair of linear protrusions 17 and 17 formed on one of the pair of hole-side flat surfaces 13 and 13 are deformed uniformly on the other of the pair of shaft-side flat surfaces 6 and 6.
  • 17 and 17 indicate a gap ( ⁇ ) between the other end in the width direction of the other pair of shaft side flat surfaces 6 and 6 and the other of the pair of hole side flat surfaces 13 and 13. It can bury and can prevent rattling of the fitting part of the shaft end 3 and the shaft hole 4.
  • the shaft hole 4 and the shaft end portion are the same as the shaft hole structure of the resin rotation transmission member 1 according to the second embodiment. 3 can prevent the occurrence of rotation transmission error and the occurrence of collision noise due to the rattling of the fitting part.
  • FIG. 15 is a view for explaining the shaft hole structure of the resin rotation transmission member 1 according to Modification 2.
  • FIG. 15 (a) is a front view of the resin rotation transmission member 1
  • FIG. b) is a sectional view of a fitting portion between the shaft end 3 of the rotation transmission shaft 2 and the shaft hole 4 of the resin rotation transmission member 1.
  • the resin rotation transmission member 1 shown in FIG. 15 is the same as the resin rotation transmission member 1 according to the second embodiment except for the position where the linear protrusions 17 are formed (FIG. 11A). reference).
  • the linear protrusion 17 is formed at the center 16 in the width direction of the hole-side flat surfaces 13 and 13 of the oval hole 22.
  • the linear protrusions 17 formed on the hole-side flat surfaces 13 and 13 of the shaft hole 4 of the resin rotation transmission member 1 are provided.
  • a linear protrusion 17 is formed by deforming the shaft end portion 3 of the rotation transmission shaft 2 to form a gap ( ⁇ ) between the hole-side flat surfaces 13 and 13 of the shaft hole 4 and the shaft-side flat surfaces 6 and 6 of the shaft end portion 3. Is partially filled, and rattling of the fitting portion between the shaft hole 4 and the shaft end 3 is prevented.
  • the resin rotation transmission member 1 is not limited to gears such as worms and spur gears, but is widely applied to objects that transmit rotation such as toothed belt pulleys, cams, and rollers.

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

Abstract

Provided is a shaft hole structure for a resin rotation transmission member, the structure being capable of preventing occurrences of collision noise and occurrences of rotation transmission errors caused by a fitting portion rattling against a rotation transmission shaft. A shaft-side flat face extending along the axial direction is formed on the rotation transmission shaft on a shaft end fitted in a shaft hole (4) of a resin rotation transmission member (1). A hole-side flat face (13) is formed on the shaft hole (4) of the resin rotation transmission member (1) to face the shaft-side flat face of the rotation transmission shaft. The hole-side flat face (13) is formed so that a linear projection (17) that is deformed by the shaft end extends along the fitting direction for the shaft end when the shaft end is fitted into the shaft hole (4). The projection height of the distal end of the linear projection (17) on the side where the shaft end is inserted into the shaft hole (4) increases gradually along the fitting direction for the shaft. In addition, the deformed linear projection (17) partially fills the space between the hole-side flat face (13) and the shaft-side flat face.

Description

樹脂製回転伝達部材の軸穴構造Shaft hole structure of resin rotation transmission member
　この発明は、樹脂製回転伝達部材の軸穴と回転伝達軸との嵌合部のがたつきをなくす樹脂製回転伝達部材の軸穴構造に関する。 The present invention relates to a shaft hole structure of a resin rotation transmission member that eliminates rattling of a fitting portion between the shaft hole of the resin rotation transmission member and the rotation transmission shaft.
　従来から、回転伝達機構において、歯車等の回転伝達部材を回転伝達軸（駆動軸又は被動軸）と一体に回動させるため、回転伝達軸にはＤカット軸部（回転伝達軸の軸心に直交する断面形状がＤ形状の軸部）が形成され、回転伝達部材にはＤカット軸部と嵌合するＤカット穴（回転伝達部材の回転軸心に直交する断面形状がＤ形状の穴）が形成されている。そして、回転伝達軸と回転伝達部材は、Ｄカット軸部とＤカット穴とが嵌合されることにより、Ｄカット軸部の軸側平坦面とＤカット穴の穴側平坦面とで相対回動が阻止されるようになっている（特許文献１及び２参照）。 Conventionally, in a rotation transmission mechanism, a rotation transmission member such as a gear is rotated integrally with a rotation transmission shaft (drive shaft or driven shaft). Therefore, the rotation transmission shaft has a D-cut shaft portion (on the axis of the rotation transmission shaft). A shaft section having a D-shaped cross section orthogonal to the D-cut hole is formed in the rotation transmission member (a hole having a D-shaped cross section perpendicular to the rotation axis of the rotation transmission member). Is formed. The rotation transmission shaft and the rotation transmission member are rotated relative to each other between the shaft-side flat surface of the D-cut shaft portion and the hole-side flat surface of the D-cut hole by fitting the D-cut shaft portion and the D-cut hole. The movement is prevented (see Patent Documents 1 and 2).
実開平２－８０２５１号公報（図１及び図２の記載参照）Japanese Utility Model Publication No. 2-80251 (refer to the description of FIGS. 1 and 2) 特許第５０３０５５５号公報（段落番号００３２、段落番号００３６、及び図２の記載参照）Japanese Patent No. 5030555 (see paragraph number 0032, paragraph number 0036, and description of FIG. 2)
　しかしながら、回転伝達軸と回転伝達部材は、Ｄカット軸部とＤカット穴に嵌合隙間Δがある場合、Ｄカット軸部とＤカット穴との嵌合部分にがたつきが生じ、回転伝達誤差を生じる。また、図１６に示すように、回転伝達軸１００と回転伝達部材１０１は、Ｄカット軸部１０２とＤカット穴１０３に嵌合隙間Δがある場合、回転始動時、回転停止時、及び逆回転時等にＤカット軸部１０２の軸側平坦面１０４の端部１０４ａ，１０４ｂとＤカット穴１０３の穴側平坦面１０５とが衝突して衝突音を発生する。 However, when the rotation transmission shaft and the rotation transmission member have a fitting gap Δ between the D-cut shaft portion and the D-cut hole, rattling occurs in the fitting portion between the D-cut shaft portion and the D-cut hole. An error is generated. Further, as shown in FIG. 16, the rotation transmission shaft 100 and the rotation transmission member 101 have a fitting clearance Δ between the D-cut shaft portion 102 and the D-cut hole 103, when starting rotation, when stopping rotation, and reverse rotation. Sometimes, the end portions 104a and 104b of the shaft-side flat surface 104 of the D-cut shaft portion 102 collide with the hole-side flat surface 105 of the D-cut hole 103 to generate a collision sound.
　そこで、本発明は、回転伝達軸との嵌合部分のがたつきに起因する回転伝達誤差の発生及び衝突音の発生を防止できる樹脂製回転伝達部材の軸穴構造を提供する。 Therefore, the present invention provides a shaft hole structure of a resin rotation transmission member that can prevent the occurrence of a rotation transmission error due to rattling of the fitting portion with the rotation transmission shaft and the occurrence of a collision sound.
　本発明は、回転伝達軸２に嵌合される樹脂製回転伝達部材１の軸穴構造に関するものである。本発明において、前記回転伝達軸２は、前記樹脂製回転伝達部材１の軸穴４に嵌合される軸端部３に、軸方向に沿って延びる軸側平坦面６が形成されている。また、前記樹脂製回転伝達部材１の前記軸穴４は、前記回転伝達軸２の前記軸側平坦面６に対向する穴側平坦面１３が形成されている。また、前記穴側平坦面１３は、前記軸穴４に前記回転伝達軸２の前記軸端部３が嵌合される際に、前記軸端部３によって変形させられる線状突起１７が前記軸端部３の嵌合方向に沿って延びるように形成されている。また、前記線状突起１７は、前記軸端部３が前記軸穴４に挿入される側の先端部の突起高さを前記軸端部３の嵌合方向に沿って漸増させている。 The present invention relates to a shaft hole structure of the resin rotation transmission member 1 fitted to the rotation transmission shaft 2. In the present invention, the rotation transmission shaft 2 is formed with a shaft-side flat surface 6 extending along the axial direction at the shaft end portion 3 fitted in the shaft hole 4 of the resin rotation transmission member 1. The shaft hole 4 of the resin rotation transmission member 1 is formed with a hole side flat surface 13 that faces the shaft side flat surface 6 of the rotation transmission shaft 2. Further, the hole-side flat surface 13 has linear protrusions 17 deformed by the shaft end portion 3 when the shaft end portion 3 of the rotation transmission shaft 2 is fitted into the shaft hole 4. It is formed so as to extend along the fitting direction of the end 3. In addition, the linear protrusion 17 gradually increases the protrusion height of the tip end portion on the side where the shaft end portion 3 is inserted into the shaft hole 4 along the fitting direction of the shaft end portion 3.
　本発明は、回転伝達軸の軸端部が樹脂製回転伝達部材の軸穴に嵌合される際に、樹脂製回転伝達部材の軸穴の穴側平坦面に形成された線状突起が回転伝達軸の軸端部で変形させられて、軸穴の穴側平坦面と軸端部の軸側平坦面との隙間を線状突起が部分的に埋め、軸穴と軸端部との嵌合部分のがたつきが防止される。その結果、本発明は、軸穴と軸端部との嵌合部分のがたつきに起因する回転伝達誤差の発生及び衝突音の発生を防止できる。 In the present invention, when the shaft end of the rotation transmission shaft is fitted into the shaft hole of the resin rotation transmission member, the linear protrusion formed on the hole side flat surface of the shaft rotation hole of the resin rotation transmission member rotates. Deformed at the shaft end of the transmission shaft, the linear protrusion partially fills the gap between the hole-side flat surface of the shaft hole and the shaft-side flat surface of the shaft end, and the shaft hole and the shaft end are fitted. Shaking of the joint is prevented. As a result, the present invention can prevent the occurrence of a rotation transmission error and the occurrence of a collision sound due to the rattling of the fitting portion between the shaft hole and the shaft end.
図１（ａ）は回転伝達軸（駆動軸又は被動軸）の軸端部の側面図であり、図１（ｂ）は回転伝達軸の正面図である。FIG. 1A is a side view of the shaft end portion of the rotation transmission shaft (drive shaft or driven shaft), and FIG. 1B is a front view of the rotation transmission shaft. 図２（ａ）は樹脂製回転伝達部材の正面図であり、図２（ｂ）は図２（ａ）のＡ１－Ａ１線に沿って切断して示す断面図である。2A is a front view of the resin rotation transmission member, and FIG. 2B is a cross-sectional view taken along the line A1-A1 of FIG. 2A. 図３（ａ）は回転伝達軸の軸端部と樹脂製回転伝達部材の軸穴との嵌合部分の断面図であり、図３（ｂ）は図３（ａ）の一部を拡大して示す図である。FIG. 3A is a cross-sectional view of a fitting portion between the shaft end portion of the rotation transmission shaft and the shaft hole of the resin rotation transmission member, and FIG. 3B is an enlarged view of a part of FIG. FIG. 第１実施形態の変形例１に係る樹脂製回転伝達部材の軸穴構造を説明するための図であり、樹脂製回転伝達部材の正面図である。It is a figure for demonstrating the shaft hole structure of the resin-made rotation transmission member which concerns on the modification 1 of 1st Embodiment, and is a front view of a resin-made rotation transmission member. 第１実施形態の変形例１に係る樹脂製回転伝達部材の軸穴構造を説明するための図であり、回転伝達軸の軸端部と樹脂製回転伝達部材の軸穴との嵌合部分の断面図である。It is a figure for demonstrating the shaft hole structure of the resin-made rotation transmission member which concerns on the modification 1 of 1st Embodiment, and is a fitting part of the shaft end part of a rotation transmission shaft, and the shaft hole of a resin-made rotation transmission member It is sectional drawing. 線状突起の断面形状を示す図である。It is a figure which shows the cross-sectional shape of a linear protrusion. 第１実施形態の変形例２に係る樹脂製回転伝達部材の軸穴構造を説明するための図であり、図７（ａ）は樹脂製回転伝達部材の正面図、図７（ｂ）は図７（ａ）のＡ２－Ａ２線に沿って切断して示す断面図である。It is a figure for demonstrating the shaft hole structure of the resin-made rotation transmission member which concerns on the modification 2 of 1st Embodiment, Fig.7 (a) is a front view of a resin-made rotation transmission member, FIG.7 (b) is a figure. FIG. 7A is a cross-sectional view taken along line A2-A2 in FIG. 第１実施形態の変形例３に係る樹脂製回転伝達部材の軸穴構造を説明するための図であり、図８（ａ）は樹脂製回転伝達部材の正面図、図８（ｂ）は図８（ａ）のＡ３－Ａ３線に沿って切断して示す断面図である。It is a figure for demonstrating the shaft hole structure of the resin-made rotation transmission member which concerns on the modification 3 of 1st Embodiment, Fig.8 (a) is a front view of a resin-made rotation transmission member, FIG.8 (b) is a figure. FIG. 8A is a cross-sectional view taken along line A3-A3 in FIG. 第１実施形態の変形例４に係る樹脂製回転伝達部材の軸穴構造を説明するための図であり、図９（ａ）は樹脂製回転伝達部材１の正面図、図９（ｂ）は回転伝達軸の軸端部と樹脂製回転伝達部材の軸穴との嵌合部分の断面図である。It is a figure for demonstrating the shaft hole structure of the resin-made rotation transmission member which concerns on the modification 4 of 1st Embodiment, Fig.9 (a) is a front view of the resin-made rotation transmission member 1, FIG.9 (b) is FIG. It is sectional drawing of the fitting part of the shaft end part of a rotation transmission shaft, and the shaft hole of resin-made rotation transmission members. 本発明の第２実施形態に係る樹脂製回転伝達部材の軸穴構造を説明するための図であり、図１０（ａ）は回転伝達軸（駆動軸又は被動軸）の軸端部の側面図であり、図１０（ｂ）は回転伝達軸の正面図である。It is a figure for demonstrating the shaft hole structure of the resin-made rotation transmission member which concerns on 2nd Embodiment of this invention, Fig.10 (a) is a side view of the axial end part of a rotation transmission shaft (a drive shaft or a driven shaft). FIG. 10B is a front view of the rotation transmission shaft. 図１１（ａ）は樹脂製回転伝達部材の正面図であり、図１１（ｂ）は図１１（ａ）のＡ４－Ａ４線に沿って切断して示す断面図である。FIG. 11A is a front view of a resin rotation transmission member, and FIG. 11B is a cross-sectional view taken along line A4-A4 of FIG. 11A. 図１２（ａ）は回転伝達軸の軸端部と樹脂製回転伝達部材の軸穴との嵌合部分の断面図であり、図１２（ｂ）は図１２（ａ）の一部を拡大して示す図である。12A is a cross-sectional view of a fitting portion between the shaft end portion of the rotation transmission shaft and the shaft hole of the resin rotation transmission member, and FIG. 12B is an enlarged view of a part of FIG. FIG. 第２実施形態の変形例１に係る樹脂製回転伝達部材の軸穴構造を説明するための図であり、樹脂製回転伝達部材の正面図である。It is a figure for demonstrating the shaft hole structure of the resin rotation transmission member which concerns on the modification 1 of 2nd Embodiment, and is a front view of a resin rotation transmission member. 第２実施形態の変形例１に係る樹脂製回転伝達部材の軸穴構造を説明するための図であり、回転伝達軸の軸端部と樹脂製回転伝達部材の軸穴との嵌合部分の断面図である。It is a figure for demonstrating the shaft hole structure of the resin-made rotation transmission member which concerns on the modification 1 of 2nd Embodiment, and is the fitting part of the shaft end part of a rotation transmission shaft, and the shaft hole of a resin-made rotation transmission member It is sectional drawing. 第２実施形態の変形例２に係る樹脂製回転伝達部材の軸穴構造を説明するための図であり、図１５（ａ）は樹脂製回転伝達部材１の正面図、図１５（ｂ）は回転伝達軸の軸端部と樹脂製回転伝達部材の軸穴との嵌合部分の断面図である。It is a figure for demonstrating the shaft hole structure of the resin-made rotation transmission member which concerns on the modification 2 of 2nd Embodiment, Fig.15 (a) is a front view of the resin-made rotation transmission member 1, FIG.15 (b) is FIG. It is sectional drawing of the fitting part of the shaft end part of a rotation transmission shaft, and the shaft hole of resin-made rotation transmission members. 従来の回転伝達軸の軸端部と回転伝達部材の軸穴との嵌合部分の断面図である。It is sectional drawing of the fitting part of the shaft end part of the conventional rotation transmission shaft, and the shaft hole of a rotation transmission member.
　以下、本発明の実施形態を図面に基づき詳述する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
　［第１実施形態］
　図１乃至図３は、本発明の第１実施形態に係る樹脂製回転伝達部材１の軸穴構造を説明するための図である。なお、図１（ａ）は回転伝達軸２（駆動軸又は被動軸）の軸端部３の側面図であり、図１（ｂ）は回転伝達軸２の正面図である。また、図２（ａ）は樹脂製回転伝達部材１の正面図であり、図２（ｂ）は図２（ａ）のＡ１－Ａ１線に沿って切断して示す断面図である。また、図３（ａ）は回転伝達軸２の軸端部３と樹脂製回転伝達部材１の軸穴４との嵌合部分の断面図であり、図３（ｂ）は図３（ａ）の一部を拡大して示す図である。 [First Embodiment]
FIGS. 1 to 3 are views for explaining a shaft hole structure of the resin rotation transmission member 1 according to the first embodiment of the present invention. 1A is a side view of the shaft end portion 3 of the rotation transmission shaft 2 (drive shaft or driven shaft), and FIG. 1B is a front view of the rotation transmission shaft 2. 2A is a front view of the resin rotation transmission member 1, and FIG. 2B is a cross-sectional view taken along the line A1-A1 of FIG. 2A. 3A is a cross-sectional view of a fitting portion between the shaft end 3 of the rotation transmission shaft 2 and the shaft hole 4 of the resin rotation transmission member 1, and FIG. 3B is a diagram of FIG. 3A. It is a figure which expands and shows a part of.
　図１に示すように、回転伝達軸２は、軸端部３が樹脂製回転伝達部材１の軸穴４に嵌合されるようになっている。回転伝達軸２の軸端部３は、軸方向（軸心５の延びる方向）に直交する断面形状がＤ形状であり、軸方向に沿って延びる軸側平坦面６が丸棒を切り欠くようにして形成されている。 As shown in FIG. 1, the rotation transmission shaft 2 is configured such that the shaft end portion 3 is fitted in the shaft hole 4 of the resin rotation transmission member 1. The shaft end portion 3 of the rotation transmission shaft 2 has a D-shaped cross section perpendicular to the axial direction (the direction in which the axis 5 extends), and the shaft-side flat surface 6 extending along the axial direction cuts out the round bar. Is formed.
　図２に示すように、樹脂製回転伝達部材１は、有底の軸穴４が形成されたボス７の外周側にウォーム８が形成され、そのウォーム８が図外のウォームホイールと噛み合うようになっている。この樹脂製回転伝達部材１は、溶融状態の合成樹脂材料（ポリアセタール（ＰＯＭ）、ポリアミド（ＰＡ）等）を金型のキャビティ内に射出して成形されている。軸穴４は、回転軸心１０に沿って形成されており、開口端側軸穴部分１１と穴底側軸穴部分１２とが形成されている。開口端側軸穴部分１１は、回転軸心１０に直交する断面形状が円形の丸穴である。穴底側軸穴部分１２は、回転軸心１０に直交する断面形状がＤ形状の穴（以下、Ｄ形状穴と略称する）であり、軸穴４に嵌合された軸端部３の軸側平坦面６に対向する穴側平坦面１３が形成されている。そして、穴側平坦面１３が開口端側軸穴部分（丸穴）１１の内周面に傾斜面１４で滑らかに接続されている。これにより、軸穴４の開口端側軸穴部分１１に挿入された回転伝達軸２の軸端部３は、傾斜面１４に案内されて、穴底１５側のＤ形状穴１２に円滑に嵌合する。また、Ｄ形状穴１２の穴側平坦面１３は、回転軸心１０に沿った方向（軸端部３の嵌合方向に沿った方向）を長手方向とし、この長手方向に直交する方向を幅方向とすると、傾斜面１４から所定寸法だけ長手方向にずれた位置で且つ幅方向中央（Ａ１－Ａ１線と穴側平坦面１３との交点）１６から幅方向一端部側にずれた位置に線状突起１７が形成されている。線状突起１７は、長手方向に沿って穴底１５まで形成されており、長手方向に直交する断面形状が略半円形状であり（図６（ａ）参照）、先端部が突起高さを長手方向に沿って（穴底１５へ向かって）漸増させる傾斜面１８になっている。そして、この線状突起１７は、回転伝達軸２の軸端部３が軸穴４のＤ形状穴１２に嵌合される際に、軸端部３の軸側平坦面６で傾斜面１８から徐々に変形させられるようになっているため、無理なく変形させられる。また、線状突起１７は、穴側平坦面１３の幅方向一端から僅かに幅方向中央１６寄りにずれて位置しているため、幅方向の両側に変形を許容するスペースが確保され、軸端部３の軸側平坦面６で円滑に変形させられ、軸穴４への軸端部３の嵌合作業を妨げる程の大きな嵌合抵抗を生じさせることがない。なお、線状突起１７は、図６（ａ）に示した略半円形状の断面形状のものに限定されず、図６（ｂ）に示すような略二等辺三角形の断面形状のものでもよく、また、図６（ｃ）に示すような略直角三角形の断面形状のものでもよい。また、線状突起１７は、略半円形状の断面形状のものと同様の効果を得ることができる限り、図６（ａ）乃至図６（ｃ）の断面形状のものに限定されない。 As shown in FIG. 2, the rotation transmission member 1 made of resin has a worm 8 formed on the outer peripheral side of a boss 7 in which a bottomed shaft hole 4 is formed so that the worm 8 meshes with a worm wheel not shown. It has become. The resin rotation transmission member 1 is molded by injecting a molten synthetic resin material (polyacetal (POM), polyamide (PA), etc.) into a cavity of a mold. The shaft hole 4 is formed along the rotation axis 10, and an opening end side shaft hole portion 11 and a hole bottom side shaft hole portion 12 are formed. The opening end side shaft hole portion 11 is a round hole having a circular cross-section perpendicular to the rotation axis 10. The hole bottom-side shaft hole portion 12 is a hole having a D-shaped cross-section perpendicular to the rotation axis 10 (hereinafter, abbreviated as a D-shaped hole), and the shaft end 3 fitted in the shaft hole 4 has a shaft. A hole side flat surface 13 facing the side flat surface 6 is formed. The hole side flat surface 13 is smoothly connected to the inner peripheral surface of the opening end side shaft hole portion (round hole) 11 by the inclined surface 14. Thereby, the shaft end portion 3 of the rotation transmission shaft 2 inserted into the opening end side shaft hole portion 11 of the shaft hole 4 is guided by the inclined surface 14 and smoothly fitted into the D-shaped hole 12 on the hole bottom 15 side. Match. Further, the hole-side flat surface 13 of the D-shaped hole 12 has a direction along the rotation axis 10 (a direction along the fitting direction of the shaft end portion 3) as a longitudinal direction, and a direction perpendicular to the longitudinal direction has a width. The direction of the line is a position shifted in the longitudinal direction from the inclined surface 14 by a predetermined dimension and a position shifted from the center in the width direction (intersection of the A1-A1 line and the hole side flat surface 13) 16 toward one end in the width direction. A protrusion 17 is formed. The linear protrusion 17 is formed up to the hole bottom 15 along the longitudinal direction, the cross-sectional shape orthogonal to the longitudinal direction is a substantially semicircular shape (see FIG. 6A), and the tip portion has a protrusion height. The inclined surface 18 gradually increases along the longitudinal direction (toward the hole bottom 15). The linear protrusion 17 is formed from the inclined surface 18 on the shaft-side flat surface 6 of the shaft end 3 when the shaft end 3 of the rotation transmission shaft 2 is fitted into the D-shaped hole 12 of the shaft hole 4. Since it can be gradually deformed, it can be deformed without difficulty. Further, since the linear protrusion 17 is positioned slightly shifted from the one end in the width direction of the hole side flat surface 13 toward the center 16 in the width direction, a space for allowing deformation is secured on both sides in the width direction, and the shaft end It is smoothly deformed by the shaft-side flat surface 6 of the portion 3 and does not cause a large fitting resistance that hinders the fitting operation of the shaft end portion 3 to the shaft hole 4. The linear protrusion 17 is not limited to the substantially semicircular cross-sectional shape shown in FIG. 6A, and may have a substantially isosceles triangular cross-sectional shape as shown in FIG. 6B. Moreover, the thing of the cross-sectional shape of a substantially right triangle as shown in FIG.6 (c) may be sufficient. The linear protrusions 17 are not limited to those having the cross-sectional shapes of FIGS. 6A to 6C as long as the same effects as those of the substantially semicircular cross-sectional shape can be obtained.
　図３は、Ｄ形状の軸端部３とＤ形状穴１２との嵌合部分を拡大して示す図である。この図３に示すように、穴側平坦面１３の幅方向の一端部側に位置する線状突起１７は、Ｄ形状の軸端部３とＤ形状穴１２との間に隙間Δがある場合、Ｄ形状の軸端部３がＤ形状穴１２に嵌合される際に、軸端部３の軸側平坦面６の幅方向の一端部側で変形させられながら、穴側平坦面１３の幅方向の他端部側に軸側平坦面６の幅方向の他端部を当接させて（隙間を部分的に埋めて）、Ｄ形状の軸端部３とＤ形状穴１２との嵌合部分のがたつきを防止する。その結果、本実施形態に係る樹脂製回転伝達部材１の軸穴構造によれば、軸穴４と軸端部３との嵌合部分のがたつきに起因する回転伝達誤差の発生及び衝突音の発生を防止できる。 FIG. 3 is an enlarged view showing a fitting portion between the D-shaped shaft end 3 and the D-shaped hole 12. As shown in FIG. 3, the linear protrusion 17 located on one end side in the width direction of the hole-side flat surface 13 has a gap Δ between the D-shaped shaft end 3 and the D-shaped hole 12. When the D-shaped shaft end 3 is fitted into the D-shaped hole 12, the hole-side flat surface 13 is deformed while being deformed at one end in the width direction of the shaft-side flat surface 6 of the shaft end 3. The other end in the width direction of the shaft-side flat surface 6 is brought into contact with the other end in the width direction (a gap is partially filled), and the D-shaped shaft end 3 and the D-shaped hole 12 are fitted. Prevent rattling of the joint. As a result, according to the shaft hole structure of the resin rotation transmission member 1 according to the present embodiment, the occurrence of rotation transmission error and the collision sound due to the rattling of the fitting portion between the shaft hole 4 and the shaft end 3. Can be prevented.
　　（第１実施形態の変形例１）
　図４及び図５は、第１実施形態の変形例１に係る樹脂製回転伝達部材１の軸穴構造を説明するための図である。なお、図４は、本変形例１に係る樹脂製回転伝達部材１の正面図である。また、図５は、回転伝達軸２の軸端部３と樹脂製回転伝達部材１の軸穴４との嵌合部分の断面図であり、図３（ａ）に対応する図である。 (Modification 1 of the first embodiment)
4 and 5 are views for explaining the shaft hole structure of the resin-made rotation transmission member 1 according to the first modification of the first embodiment. FIG. 4 is a front view of the resin rotation transmission member 1 according to the first modification. 5 is a cross-sectional view of a fitting portion between the shaft end 3 of the rotation transmission shaft 2 and the shaft hole 4 of the resin rotation transmission member 1, and corresponds to FIG. 3 (a).
　本変形例１に係る樹脂製回転伝達部材１の軸穴構造は、一対の線状突起１７，１７が穴側平坦面１３の幅方向中央１６に対して対称に配置されている。このような本変形例１に係る樹脂製回転伝達部材１の軸穴構造によれば、一対の線状突起１７，１７が軸端部３の軸側平坦面６で均等に変形させられて、変形させられた一対の線状突起１７，１７が軸側平坦面６の幅方向両端部側と穴側平坦面１３との隙間（Δ）を埋めて、軸端部３と軸穴４との嵌合部分のがたつきを防止することができる。その結果、本変形例１に係る樹脂製回転伝達部材１の軸穴構造によれば、第１実施形態に係る樹脂製回転伝達部材１の軸穴構造と同様に、軸穴４と軸端部３との嵌合部分のがたつきに起因する回転伝達誤差の発生及び衝突音の発生を防止できる。 In the shaft hole structure of the resin rotation transmission member 1 according to the first modification, the pair of linear protrusions 17 are arranged symmetrically with respect to the center 16 in the width direction of the hole side flat surface 13. According to the shaft hole structure of the resin rotation transmission member 1 according to the first modification, the pair of linear protrusions 17 and 17 are uniformly deformed on the shaft-side flat surface 6 of the shaft end portion 3, The pair of deformed linear protrusions 17, 17 fills the gap (Δ) between the both ends in the width direction of the shaft-side flat surface 6 and the hole-side flat surface 13, so that the shaft end 3 and the shaft hole 4 Shaking of the fitting portion can be prevented. As a result, according to the shaft hole structure of the resin rotation transmission member 1 according to the first modification, the shaft hole 4 and the shaft end portion are the same as the shaft hole structure of the resin rotation transmission member 1 according to the first embodiment. 3 can prevent the occurrence of rotation transmission error and the occurrence of collision noise due to the rattling of the fitting part.
　　（第１実施形態の変形例２）
　図７は、本変形例２に係る樹脂製回転伝達部材１の軸穴構造を説明するための図である。なお、図７（ａ）は樹脂製回転伝達部材１の正面図であり、図７（ｂ）は図７（ａ）のＡ２－Ａ２線に沿って切断して示す断面図である。 (Modification 2 of the first embodiment)
FIG. 7 is a view for explaining the shaft hole structure of the resin rotation transmission member 1 according to the second modification. 7A is a front view of the resin rotation transmission member 1, and FIG. 7B is a cross-sectional view taken along line A2-A2 of FIG. 7A.
　本変形例２に係る樹脂製回転伝達部材１は、軸穴４がボス７を回転軸心１０に沿って貫通しており、有底の軸穴４がボス７に形成された第１実施形態に係る樹脂製回転伝達部材１と相違するが、他の構成が第１実施形態に係る樹脂製回転伝達部材１と同様である。本変形例２において、線状突起１７は、図７（ｂ）に示すように、軸穴４の右側の開口端まで穴側平坦面１３と共に形成されている。このような本変形例２に係る樹脂製回転伝達部材１の軸穴構造によれば、第１実施形態に係る樹脂製回転伝達部材１の軸穴構造と同様の効果を得ることができる。 In the resin rotation transmission member 1 according to the second modification, the shaft hole 4 passes through the boss 7 along the rotation axis 10, and the bottomed shaft hole 4 is formed in the boss 7. Although it is different from the resin-made rotation transmission member 1 according to the present embodiment, other configurations are the same as those of the resin-made rotation transmission member 1 according to the first embodiment. In the second modification, the linear protrusion 17 is formed together with the hole-side flat surface 13 up to the opening end on the right side of the shaft hole 4 as shown in FIG. According to the shaft hole structure of the resin rotation transmission member 1 according to the second modification, the same effect as the shaft hole structure of the resin rotation transmission member 1 according to the first embodiment can be obtained.
　　（第１実施形態の変形例３）
　図８は、本変形例３に係る樹脂製回転伝達部材１の軸穴構造を説明するための図である。なお、図８（ａ）は樹脂製回転伝達部材１の正面図であり、図８（ｂ）は図８（ａ）のＡ３－Ａ３線に沿って切断して示す断面図である。 (Modification 3 of the first embodiment)
FIG. 8 is a view for explaining the shaft hole structure of the resin-made rotation transmission member 1 according to the third modification. 8A is a front view of the resin rotation transmission member 1, and FIG. 8B is a cross-sectional view taken along line A3-A3 of FIG. 8A.
　本変形例３に係る樹脂製回転伝達部材１は、ボス７の外周側に歯２０が形成された平歯車であり、軸穴４がボス７を回転軸心１０に沿って貫通しており、軸穴４の両開口端のいずれの側からも軸端部３を嵌合することができるようになっている。そして、図８（ｂ）に示すように、本変形例３に係る樹脂製回転伝達部材１は、軸穴４の穴側平坦面１３及び線状突起１７の形状がボス７を回転軸心１０に沿った方向に二分する中心線２１に対して左右対称となるように形成されている。なお、図８（ａ）に示すように、本変形例３に係る樹脂製回転伝達部材１は、軸穴４の正面側の形状が第１実施形態に係る樹脂製回転伝達部材１の軸穴４の正面側の形状と同様である（図２（ａ）参照）。このような本変形例３に係る樹脂製回転伝達部材１の軸穴構造によれば、第１実施形態に係る樹脂製回転伝達部材１の軸穴構造と同様の効果を得ることができる。 The resin rotation transmission member 1 according to the third modification is a spur gear having teeth 20 formed on the outer peripheral side of the boss 7, and the shaft hole 4 penetrates the boss 7 along the rotation axis 10. The shaft end portion 3 can be fitted from either side of both open ends of the shaft hole 4. As shown in FIG. 8 (b), the resin-made rotation transmission member 1 according to the third modification is configured so that the hole-side flat surface 13 of the shaft hole 4 and the shape of the linear protrusions 17 have the boss 7 as the rotational axis 10. It is formed so as to be bilaterally symmetric with respect to the center line 21 that is divided into two in the direction along the line. In addition, as shown to Fig.8 (a), as for the resin-made rotation transmission member 1 which concerns on this modification 3, the shape of the front side of the shaft hole 4 is the shaft hole of the resin-made rotation transmission member 1 which concerns on 1st Embodiment. 4 is the same as the shape on the front side (see FIG. 2A). According to the shaft hole structure of the resin rotation transmission member 1 according to the third modification, the same effect as the shaft hole structure of the resin rotation transmission member 1 according to the first embodiment can be obtained.
　　（第１実施形態の変形例４）
　図９は、本変形例４に係る樹脂製回転伝達部材１の軸穴構造を説明するための図であり、図９（ａ）が樹脂製回転伝達部材１の正面図であり、図９（ｂ）が回転伝達軸の軸端部と樹脂製回転伝達部材の軸穴との嵌合部分の断面図である。なお、図９に示す樹脂製回転伝達部材１は、線状突起１７の形成位置を除き、他の構成が第１実施形態に係る樹脂製回転伝達部材１と同様である（図２（ａ）参照）。 (Modification 4 of the first embodiment)
FIG. 9 is a view for explaining the shaft hole structure of the resin rotation transmission member 1 according to Modification 4. FIG. 9A is a front view of the resin rotation transmission member 1, and FIG. b) is a cross-sectional view of a fitting portion between the shaft end portion of the rotation transmission shaft and the shaft hole of the resin rotation transmission member. The resin rotation transmission member 1 shown in FIG. 9 is the same as the resin rotation transmission member 1 according to the first embodiment except for the position where the linear protrusions 17 are formed (FIG. 2A). reference).
　本変形例に係る樹脂製回転伝達部材１は、線状突起１７がＤ形状穴１２の穴側平坦面１３の幅方向中央１６に形成されている。このような本変形例に係る樹脂製回転伝達部材１の軸穴構造によれば、樹脂製回転伝達部材１の軸穴４の穴側平坦面１３に形成された線状突起１７が回転伝達軸２の軸端部３で変形させられて、軸穴４の穴側平坦面１３と軸端部３の軸側平坦面６との隙間（Δ）を線状突起１７が部分的に埋め、軸穴４と軸端部３との嵌合部分のがたつきが防止される。 In the resin rotation transmission member 1 according to this modification, the linear protrusion 17 is formed at the center 16 in the width direction of the hole-side flat surface 13 of the D-shaped hole 12. According to the shaft hole structure of the resin rotation transmission member 1 according to this modification, the linear protrusion 17 formed on the hole-side flat surface 13 of the shaft hole 4 of the resin rotation transmission member 1 has the rotation transmission shaft. 2, the linear protrusion 17 partially fills the gap (Δ) between the hole-side flat surface 13 of the shaft hole 4 and the shaft-side flat surface 6 of the shaft end 3. Shaking of the fitting portion between the hole 4 and the shaft end 3 is prevented.
　［第２実施形態］
　図１０乃至図１２は、本発明の第２実施形態に係る樹脂製回転伝達部材１の軸穴構造を説明するための図である。なお、図１０（ａ）は回転伝達軸２（駆動軸又は被動軸）の軸端部３の側面図であり、図１０（ｂ）は回転伝達軸２の正面図である。また、図１１（ａ）は樹脂製回転伝達部材１の正面図であり、図１１（ｂ）は図１１（ａ）のＡ４－Ａ４線に沿って切断して示す断面図である。また、図１２（ａ）は回転伝達軸の軸端部と樹脂製回転伝達部材の軸穴との嵌合部分の断面図であり、図１２（ｂ）は図１２（ａ）の一部を拡大して示す図である。 [Second Embodiment]
10 to 12 are views for explaining a shaft hole structure of the resin rotation transmission member 1 according to the second embodiment of the present invention. 10A is a side view of the shaft end 3 of the rotation transmission shaft 2 (drive shaft or driven shaft), and FIG. 10B is a front view of the rotation transmission shaft 2. 11A is a front view of the resin rotation transmission member 1, and FIG. 11B is a cross-sectional view taken along line A4-A4 of FIG. 11A. 12A is a cross-sectional view of a fitting portion between the shaft end portion of the rotation transmission shaft and the shaft hole of the resin rotation transmission member, and FIG. 12B is a part of FIG. 12A. FIG.
　図１０に示すように、回転伝達軸２の軸端部３は、軸方向（軸心５の延びる方向）に直交する断面形状が小判形形状であり、軸方向に沿って延びる一対の軸側平坦面６，６が丸棒を軸方向に沿って平行に切り欠くようにして形成されている。 As shown in FIG. 10, the shaft end portion 3 of the rotation transmission shaft 2 has an oval cross-sectional shape orthogonal to the axial direction (direction in which the shaft center 5 extends), and a pair of shaft sides extending along the axial direction. The flat surfaces 6 and 6 are formed so as to cut out the round bar in parallel along the axial direction.
　図１１に示すように、樹脂製回転伝達部材１は、有底の軸穴４が形成されたボス７の外周側にウォーム８が形成され、そのウォーム８が図外のウォームホイールと噛み合うようになっている。この樹脂製回転伝達部材１は、溶融状態の合成樹脂材料（ポリアセタール（ＰＯＭ）、ポリアミド（ＰＡ）等）を金型のキャビティ内に射出して成形されている。軸穴４は、回転軸心１０に沿って形成されており、開口端側軸穴部分１１と穴底側軸穴部分２２とが形成されている。開口端側軸穴部分１１は、回転軸心１０に直交する断面形状が円形の丸穴である。穴底側軸穴部分２２は、回転軸心１０に直交する断面形状が小判形形状の穴（以下、小判形形状穴と略称する）であり、軸穴４に嵌合された軸端部３の一対の軸側平坦面６，６に対向する一対の穴側平坦面１３，１３が形成されている。そして、穴側平坦面１３，１３が開口端側軸穴部分（丸穴）１１の内周面に傾斜面１４で滑らかに接続されている。これにより、軸穴４の開口端側に位置する開口端側軸穴部分１１に挿入された回転伝達軸２の小判形形状の軸端部３は、傾斜面１４に案内されて、穴底１５側の小判形形状穴２２に円滑に嵌合する。また、小判形形状穴２２の穴側平坦面１３，１３は、回転軸心１０に沿った方向（軸端部３の嵌合方向に沿った方向）を長手方向とし、この長手方向に直交する方向を幅方向とすると、傾斜面１４から所定寸法だけ長手方向にずれた位置で且つ幅方向中央１６から幅方向一端部側にずれた位置に線状突起１７，１７が形成されている。そして、一対の線状突起１７，１７は、一方の線状突起１７と他方の線状突起１７を結ぶ仮想直線が軸穴４の中心（回転軸心１０）を通るような位置に形成されており、軸穴４の回転軸心１０を回転中心とする２回対称の位置にある。また、一対の線状突起１７，１７は、長手方向に沿って穴底１５まで形成されており、長手方向に直交する断面形状が略半円形状であり（図６（ａ）参照）、先端部が突起高さを長手方向に沿って（穴底へ向かって）漸増させる傾斜面１８になっている。そして、この線状突起１７は、回転伝達軸２の軸端部３が軸穴４の小判形形状穴２２に嵌合される際に、軸端部３の軸側平坦面６で傾斜面１８から徐々に変形させられるようになっているため、無理なく変形させられる。また、線状突起１７は、穴側平坦面１３，１３の幅方向一端から僅かに幅方向中央１６寄りにずれて位置しているため、幅方向の両側に変形を許容するスペースが確保され、軸端部３の軸側平坦面６で円滑に変形させられ、軸穴４への軸端部３の嵌合作業を妨げる程の大きな嵌合抵抗を生じさせることがない。なお、線状突起１７は、図６（ａ）に示した略半円形状の断面形状のものに限定されず、図６（ｂ）に示すような略二等辺三角形の断面形状のものでもよく、また、図６（ｃ）に示すような略直角三角形の断面形状のものでもよい。また、線状突起１７は、略半円形状の断面形状のものと同様の効果を得ることができる限り、図６（ａ）乃至図６（ｃ）の断面形状のものに限定されない。 As shown in FIG. 11, the resin rotation transmission member 1 has a worm 8 formed on the outer peripheral side of a boss 7 in which a bottomed shaft hole 4 is formed, and the worm 8 meshes with a worm wheel (not shown). It has become. The resin rotation transmission member 1 is molded by injecting a molten synthetic resin material (polyacetal (POM), polyamide (PA), etc.) into a cavity of a mold. The shaft hole 4 is formed along the rotation axis 10, and an opening end side shaft hole portion 11 and a hole bottom side shaft hole portion 22 are formed. The opening end side shaft hole portion 11 is a round hole having a circular cross-section perpendicular to the rotation axis 10. The hole bottom side shaft hole portion 22 is a hole whose cross-sectional shape orthogonal to the rotation axis 10 is an oval shape (hereinafter, abbreviated as an oval shape hole), and the shaft end portion 3 fitted in the shaft hole 4. A pair of hole side flat surfaces 13, 13 are formed opposite to the pair of shaft side flat surfaces 6, 6. The hole side flat surfaces 13 and 13 are smoothly connected to the inner peripheral surface of the opening end side shaft hole portion (round hole) 11 by the inclined surface 14. As a result, the oval-shaped shaft end portion 3 of the rotation transmission shaft 2 inserted into the opening end side shaft hole portion 11 located on the opening end side of the shaft hole 4 is guided by the inclined surface 14, and the hole bottom 15. Fits smoothly into the oval-shaped hole 22 on the side. Further, the hole-side flat surfaces 13, 13 of the oval-shaped hole 22 have a direction along the rotation axis 10 (a direction along the fitting direction of the shaft end 3) as a longitudinal direction, and are orthogonal to the longitudinal direction. Assuming that the direction is the width direction, linear protrusions 17 and 17 are formed at positions shifted from the inclined surface 14 in the longitudinal direction by a predetermined dimension and at positions shifted from the width direction center 16 toward one end in the width direction. The pair of linear protrusions 17 and 17 are formed at positions where a virtual straight line connecting one linear protrusion 17 and the other linear protrusion 17 passes through the center of the shaft hole 4 (rotation axis 10). It is in a two-fold symmetrical position with the rotation axis 10 of the shaft hole 4 as the center of rotation. Further, the pair of linear protrusions 17 and 17 are formed to the hole bottom 15 along the longitudinal direction, and the cross-sectional shape orthogonal to the longitudinal direction is a substantially semicircular shape (see FIG. 6A), and the tip The portion is an inclined surface 18 that gradually increases the protrusion height along the longitudinal direction (toward the hole bottom). The linear protrusions 17 are inclined surfaces 18 on the shaft-side flat surface 6 of the shaft end portion 3 when the shaft end portion 3 of the rotation transmission shaft 2 is fitted into the oval shape hole 22 of the shaft hole 4. Since it can be gradually deformed from, it can be deformed without difficulty. Further, since the linear protrusion 17 is positioned slightly shifted from the one end in the width direction of the hole-side flat surfaces 13 and 13 toward the center 16 in the width direction, a space allowing deformation is ensured on both sides in the width direction. The shaft side flat surface 6 of the shaft end portion 3 is smoothly deformed, and a large fitting resistance that prevents the shaft end portion 3 from being fitted into the shaft hole 4 is not generated. The linear protrusion 17 is not limited to the substantially semicircular cross-sectional shape shown in FIG. 6A, and may have a substantially isosceles triangular cross-sectional shape as shown in FIG. 6B. Alternatively, it may have a substantially right triangle cross section as shown in FIG. The linear protrusions 17 are not limited to those having the cross-sectional shapes of FIGS. 6A to 6C as long as the same effects as those of the substantially semicircular cross-sectional shape can be obtained.
　図１２は、小判形形状の軸端部３と小判形形状穴２２との嵌合部分を拡大して示す図である。この図１１に示すように、穴側平坦面１３の幅方向の一端部側に位置する線状突起１７は、小判形形状の軸端部３の軸側平坦面６と小判形形状穴２２の穴側平坦面１３との間に隙間Δがある場合、小判形形状の軸端部３が小判形形状穴２２に嵌合される際に、軸端部３の軸側平坦面６の幅方向の一端部側で変形させられながら、穴側平坦面１３の幅方向の他端部側に軸側平坦面６の幅方向の他端部を当接させて、小判形形状の軸端部３と小判形形状穴２２との嵌合部分のがたつきを防止する。その結果、本実施形態に係る樹脂製回転伝達部材１の軸穴構造によれば、軸穴４と軸端部３との嵌合部分のがたつきに起因する回転伝達誤差の発生及び衝突音の発生を防止できる。 FIG. 12 is an enlarged view of a fitting portion between the oval-shaped shaft end 3 and the oval-shaped hole 22. As shown in FIG. 11, the linear protrusion 17 located on one end side in the width direction of the hole-side flat surface 13 is formed between the shaft-side flat surface 6 of the oval-shaped shaft end portion 3 and the oval-shaped hole 22. When there is a gap Δ between the hole-side flat surface 13 and the oval-shaped shaft end 3 is fitted into the oval-shaped hole 22, the width direction of the shaft-side flat surface 6 of the shaft end 3. The other end portion in the width direction of the shaft-side flat surface 6 is brought into contact with the other end portion in the width direction of the hole-side flat surface 13 while being deformed on one end portion side, and the shaft end portion 3 having an oval shape is formed. And rattling of the fitting portion between the oval-shaped hole 22 and the oblong shape hole 22 are prevented. As a result, according to the shaft hole structure of the resin rotation transmission member 1 according to the present embodiment, the occurrence of rotation transmission error and the collision sound due to the rattling of the fitting portion between the shaft hole 4 and the shaft end 3. Can be prevented.
　　（第２実施形態の変形例１）
　図１３及び図１４は、第２実施形態の変形例１に係る樹脂製回転伝達部材１の軸穴構造を説明するための図である。なお、図１３は、本変形例１に係る樹脂製回転伝達部材１の正面図である。また、図１４は、回転伝達軸２の軸端部３と樹脂製回転伝達部材１の軸穴４との嵌合部分の断面図であり、図１２（ａ）に対応する図である。 (Modification 1 of 2nd Embodiment)
FIG.13 and FIG.14 is a figure for demonstrating the shaft hole structure of the resin-made rotation transmission members 1 which concern on the modification 1 of 2nd Embodiment. FIG. 13 is a front view of the resin rotation transmission member 1 according to the first modification. FIG. 14 is a cross-sectional view of a fitting portion between the shaft end portion 3 of the rotation transmission shaft 2 and the shaft hole 4 of the resin rotation transmission member 1, and corresponds to FIG.
　本変形例１に係る樹脂製回転伝達部材１の軸穴構造は、一対の線状突起１７，１７が一対の穴側平坦面１３，１３の一方の幅方向中央１６に対して対称に配置されると共に、一対の線状突起１７，１７が一対の穴形平坦面１３，１３の他方の幅方向中央１６に対して対称に配置されている。このような本変形例１に係る樹脂製回転伝達部材１の軸穴構造によれば、一対の穴側平坦面１３，１３の一方に形成された一対の線状突起１７，１７が軸端部３の一対の軸側平坦面６，６の一方で均等に変形させられると共に、一対の穴側平坦面１３，１３の他方に形成された一対の線状突起１７，１７が軸端部３の一対の軸側平坦面６，６の他方で均等に変形させられ、一対の穴側平坦面１３，１３の一方に形成された一対の線状突起１７，１７が一対の軸側平坦面６，６の一方の幅方向両端部側と一対の穴側平坦面１３，１３の一方との隙間（Δ）を埋め、一対の穴側平坦面１３，１３の他方に形成された一対の線状突起１７，１７が一対の軸側平坦面６，６の他方の幅方向両端部側と一対の穴側平坦面１３，１３の他方との隙間（Δ）を埋めて、軸端部３と軸穴４との嵌合部分のがたつきを防止することができる。その結果、本変形例１に係る樹脂製回転伝達部材１の軸穴構造によれば、第２実施形態に係る樹脂製回転伝達部材１の軸穴構造と同様に、軸穴４と軸端部３との嵌合部分のがたつきに起因する回転伝達誤差の発生及び衝突音の発生を防止できる。 In the shaft hole structure of the resin rotation transmission member 1 according to the first modification, the pair of linear protrusions 17, 17 are arranged symmetrically with respect to one width direction center 16 of the pair of hole side flat surfaces 13, 13. In addition, the pair of linear protrusions 17 and 17 are arranged symmetrically with respect to the other center 16 in the width direction of the pair of hole-shaped flat surfaces 13 and 13. According to the shaft hole structure of the resin-made rotation transmission member 1 according to the first modification, the pair of linear protrusions 17 and 17 formed on one of the pair of hole-side flat surfaces 13 and 13 have shaft end portions. The pair of linear projections 17 and 17 formed on the other of the pair of hole-side flat surfaces 13 and 13 are uniformly deformed by one of the pair of shaft-side flat surfaces 6 and 6. A pair of linear protrusions 17 and 17 formed on one of the pair of hole-side flat surfaces 13 and 13 are deformed uniformly on the other of the pair of shaft-side flat surfaces 6 and 6. A pair of linear protrusions formed on the other of the pair of hole-side flat surfaces 13 and 13 by filling a gap (Δ) between one end in the width direction of one of the holes 6 and one of the pair of hole-side flat surfaces 13 and 13. 17 and 17 indicate a gap (Δ) between the other end in the width direction of the other pair of shaft side flat surfaces 6 and 6 and the other of the pair of hole side flat surfaces 13 and 13. It can bury and can prevent rattling of the fitting part of the shaft end 3 and the shaft hole 4. As a result, according to the shaft hole structure of the resin rotation transmission member 1 according to the first modification, the shaft hole 4 and the shaft end portion are the same as the shaft hole structure of the resin rotation transmission member 1 according to the second embodiment. 3 can prevent the occurrence of rotation transmission error and the occurrence of collision noise due to the rattling of the fitting part.
　　（第２実施形態の変形例２）
　図１５は、本変形例２に係る樹脂製回転伝達部材１の軸穴構造を説明するための図であり、図１５（ａ）が樹脂製回転伝達部材１の正面図であり、図１５（ｂ）が回転伝達軸２の軸端部３と樹脂製回転伝達部材１の軸穴４との嵌合部分の断面図である。なお、図１５に示す樹脂製回転伝達部材１は、線状突起１７の形成位置を除き、他の構成が第２実施形態に係る樹脂製回転伝達部材１と同様である（図１１（ａ）参照）。 (Modification 2 of the second embodiment)
FIG. 15 is a view for explaining the shaft hole structure of the resin rotation transmission member 1 according to Modification 2. FIG. 15 (a) is a front view of the resin rotation transmission member 1, and FIG. b) is a sectional view of a fitting portion between the shaft end 3 of the rotation transmission shaft 2 and the shaft hole 4 of the resin rotation transmission member 1. The resin rotation transmission member 1 shown in FIG. 15 is the same as the resin rotation transmission member 1 according to the second embodiment except for the position where the linear protrusions 17 are formed (FIG. 11A). reference).
　本変形例２に係る樹脂製回転伝達部材１は、線状突起１７が小判形形状穴２２の穴側平坦面１３，１３の幅方向中央１６に形成されている。このような本変形例２に係る樹脂製回転伝達部材１の軸穴構造によれば、樹脂製回転伝達部材１の軸穴４の穴側平坦面１３、１３に形成された線状突起１７が回転伝達軸２の軸端部３で変形させられて、軸穴４の穴側平坦面１３、１３と軸端部３の軸側平坦面６，６との隙間（Δ）を線状突起１７が部分的に埋め、軸穴４と軸端部３との嵌合部分のがたつきが防止される。 In the resin rotation transmission member 1 according to the second modification, the linear protrusion 17 is formed at the center 16 in the width direction of the hole-side flat surfaces 13 and 13 of the oval hole 22. According to the shaft hole structure of the resin rotation transmission member 1 according to the second modification, the linear protrusions 17 formed on the hole-side flat surfaces 13 and 13 of the shaft hole 4 of the resin rotation transmission member 1 are provided. A linear protrusion 17 is formed by deforming the shaft end portion 3 of the rotation transmission shaft 2 to form a gap (Δ) between the hole-side flat surfaces 13 and 13 of the shaft hole 4 and the shaft-side flat surfaces 6 and 6 of the shaft end portion 3. Is partially filled, and rattling of the fitting portion between the shaft hole 4 and the shaft end 3 is prevented.
　なお、本発明において、樹脂製回転伝達部材１は、ウォームや平歯車等の歯車に限定されず、歯付きベルト用プーリ、カム、ローラ等の回転を伝達する物に広く適用される。 In the present invention, the resin rotation transmission member 1 is not limited to gears such as worms and spur gears, but is widely applied to objects that transmit rotation such as toothed belt pulleys, cams, and rollers.
　１……樹脂製回転伝達部材、２……回転伝達軸、３……軸端部、４……軸穴、６……軸側平坦面、１３……穴側平坦面、１６……幅方向中央、１７……線状突起 DESCRIPTION OF SYMBOLS 1 ... Resin rotation transmission member, 2 ... Rotation transmission shaft, 3 ... Shaft end, 4 ... Shaft hole, 6 ... Shaft side flat surface, 13 ... Hole side flat surface, 16 ... Width direction Center, 17 …… Linear protrusion

Claims (5)

  1. 　回転伝達軸に嵌合される樹脂製回転伝達部材の軸穴構造において、
    　前記回転伝達軸は、前記樹脂製回転伝達部材の軸穴に嵌合される軸端部に、軸方向に沿って延びる軸側平坦面が形成され、
    　前記樹脂製回転伝達部材の前記軸穴は、前記回転伝達軸の前記軸側平坦面に対向する穴側平坦面が形成され、
    　前記穴側平坦面は、前記軸穴に前記回転伝達軸の前記軸端部が嵌合される際に、前記軸端部によって変形させられる線状突起が前記軸端部の嵌合方向に沿って延びるように形成され、
    　前期線状突起は、前記軸端部が前記軸穴に挿入される側の先端部の突起高さを前記軸端部の嵌合方向に沿って漸増させた、
    　ことを特徴とする樹脂製回転伝達部材の軸穴構造。     In the shaft hole structure of the resin rotation transmission member fitted to the rotation transmission shaft,
    The rotation transmission shaft is formed with a shaft-side flat surface extending along the axial direction at a shaft end fitted in the shaft hole of the resin rotation transmission member.
    The shaft hole of the rotation transmission member made of resin is formed with a hole side flat surface facing the shaft side flat surface of the rotation transmission shaft,
    The hole-side flat surface has a linear protrusion deformed by the shaft end portion along the fitting direction of the shaft end portion when the shaft end portion of the rotation transmission shaft is fitted into the shaft hole. Formed to extend,
    The first linear protrusion is formed by gradually increasing the protrusion height of the tip portion on the side where the shaft end portion is inserted into the shaft hole along the fitting direction of the shaft end portion,
    A shaft hole structure of a resin-made rotation transmission member.
  2. 　前記線状突起は、前記軸端部の嵌合方向に沿った方向が前記穴側平坦面の長手方向とし、この長手方向に直交する方向が前記穴側平坦面の幅方向とすると、前記穴側平坦面の幅方向中央よりも前記幅方向にずれて位置する、
    　ことを特徴とする請求項１に記載の樹脂製回転伝達部材の軸穴構造。     When the direction along the fitting direction of the shaft end portion is the longitudinal direction of the hole-side flat surface, and the direction orthogonal to the longitudinal direction is the width direction of the hole-side flat surface, The side flat surface is positioned so as to be shifted in the width direction from the center in the width direction.
    The shaft hole structure of the resin-made rotation transmission member according to claim 1.
  3. 　前記回転伝達軸の前記軸端部は、前記軸方向に直交する断面の形状がＤ形状であり、
    　前記樹脂製回転伝達部材の前記軸穴は、前記軸端部の嵌合方向に直交する断面の形状がＤ形状である、
    　ことを特徴とする請求項１又は２に記載の樹脂製回転伝達部材の軸穴構造。     The shaft end of the rotation transmission shaft has a D-shaped cross section perpendicular to the axial direction,
    The shaft hole of the resin rotation transmission member has a D-shaped cross section perpendicular to the fitting direction of the shaft end portion.
    The shaft hole structure of the resin-made rotation transmission member according to claim 1 or 2.
  4. 　前記回転伝達軸の前記軸端部は、前記軸方向に直交する断面の形状が小判形形状であり、
    　前記樹脂製回転伝達部材の前記軸穴は、前記軸端部の嵌合方向に直交する断面の形状が小判形形状である、
    　ことを特徴とする請求項１又は２に記載の樹脂製回転伝達部材の軸穴構造。     The shaft end portion of the rotation transmission shaft has an oval shape in cross section perpendicular to the axial direction,
    The shaft hole of the resin rotation transmission member has an oval shape in cross section perpendicular to the fitting direction of the shaft end portion.
    The shaft hole structure of the resin-made rotation transmission member according to claim 1 or 2.
  5. 　前記線状突起は、前記先端部が前記軸穴の開口端から離れた位置に形成された、
    　ことを特徴とする請求項１乃至４のいずれかに記載の樹脂製回転伝達部材の軸穴構造。     The linear protrusion is formed at a position where the tip portion is separated from the opening end of the shaft hole.
    The shaft hole structure of the resin-made rotation transmission member according to any one of claims 1 to 4.
PCT/JP2017/044681 2016-12-21 2017-12-13 Shaft hole structure for resin rotation transmission member WO2018116927A1 (en)

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JP2016-247971 2016-12-21
JP2016247971A JP6924027B2 (en) 2016-12-21 2016-12-21 Shaft hole structure of resin rotation transmission member

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5526772U (en) * 1978-08-10 1980-02-21
JPS5940624U (en) * 1982-09-08 1984-03-15 三洋電機株式会社 Knob attachment device
JPS59131029A (en) * 1983-01-12 1984-07-27 Toyo Denso Co Ltd Device for securing signal rotor of signal generator
JPH0180825U (en) * 1987-11-19 1989-05-30
JPH0280251U (en) * 1988-12-09 1990-06-20
JPH10299786A (en) * 1997-02-26 1998-11-10 Toyota Motor Corp Connecting structure of rotary shaft

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5526772U (en) * 1978-08-10 1980-02-21
JPS5940624U (en) * 1982-09-08 1984-03-15 三洋電機株式会社 Knob attachment device
JPS59131029A (en) * 1983-01-12 1984-07-27 Toyo Denso Co Ltd Device for securing signal rotor of signal generator
JPH0180825U (en) * 1987-11-19 1989-05-30
JPH0280251U (en) * 1988-12-09 1990-06-20
JPH10299786A (en) * 1997-02-26 1998-11-10 Toyota Motor Corp Connecting structure of rotary shaft

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