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JP2018004053A - Umbrella gear - Google Patents

Umbrella gear Download PDF

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Publication number
JP2018004053A
JP2018004053A JP2016136064A JP2016136064A JP2018004053A JP 2018004053 A JP2018004053 A JP 2018004053A JP 2016136064 A JP2016136064 A JP 2016136064A JP 2016136064 A JP2016136064 A JP 2016136064A JP 2018004053 A JP2018004053 A JP 2018004053A
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Japan
Prior art keywords
tooth bottom
tooth
diameter end
bottom portion
small diameter
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JP2016136064A
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Japanese (ja)
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圭貴 中村
Keiki Nakamura
圭貴 中村
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Isuzu Motors Co Thailand Ltd
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Isuzu Motors Co Thailand Ltd
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Priority to JP2016136064A priority Critical patent/JP2018004053A/en
Priority to CN201710551147.3A priority patent/CN107588178A/en
Publication of JP2018004053A publication Critical patent/JP2018004053A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To secure the strength of a tooth root of an umbrella gear at a small-diameter end side.SOLUTION: A tooth bottom part 15 of an umbrella gear 10 has a first tooth bottom part 16 and a second bottom part 17 at an end part of a small-diameter end 2 side. The second tooth bottom part 17 is constituted of a tooth bottom face 19 extending along a tooth bottom conical face 14 at a center part in its width direction, and a pair of corner-thickness curved faces 20a, 20b for connecting both ends of the tooth bottom face 19 in the width direction and tooth faces 13a, 13b. The first tooth bottom part 16 is constituted of a tooth bottom face 22 extending substantially in parallel with an axial direction at the center part in its width direction, and a pair of corner-thickness curved faces 23a, 23b for connecting both ends of the tooth bottom face 22 in the width direction and the tooth faces 13a, 13b, and extends substantially in parallel with the axial direction at the outside of a radial direction rather than the tooth bottom conical face 14. Curvature radii R1 of the corner-thickness curved faces 23a, 23b of the end part of the small-diameter end 2 side out of the first tooth bottom part 16 are set larger than curvature radii R2 of the corner-thickness curved faces 23a, 23b of an end part of a connecting part 18 side connected with the second tooth bottom part 17.SELECTED DRAWING: Figure 1

Description

本発明は、各種機械の動力伝達機構に用いられる傘歯車に関する。   The present invention relates to a bevel gear used for a power transmission mechanism of various machines.

特許文献1には、傘歯車が記載されている。この傘歯車では、歯面と歯底面の間の隅肉曲線の曲率半径を小径端部から大径端部へ向けて漸次増大させて、傘歯車の大径端側の歯元強度を向上させている。   Patent Document 1 describes a bevel gear. In this bevel gear, the radius of curvature of the fillet curve between the tooth surface and the tooth bottom surface is gradually increased from the small diameter end portion toward the large diameter end portion to improve the tooth root strength on the large diameter end side of the bevel gear. ing.

特許文献2には、車両用のディファレンシャルギヤが記載されている。このディファレンシャルギヤのピニオンギヤ及びサイドギヤの小径端側の歯底部は、歯底円錐よりも径方向の外側に配置されている。   Patent Document 2 describes a differential gear for a vehicle. The pinion gear of the differential gear and the tooth bottom portion on the small diameter end side of the side gear are arranged on the outer side in the radial direction with respect to the tooth bottom cone.

特開2002−295642号公報JP 2002-295642 A 特開2013−228047号公報JP 2013-228047 A

ところで、傘歯車は、その使用態様によっては、小径端側の歯元強度(歯元部分の強度)を向上させたい場合がある。しかし、特許文献1に記載の傘歯車では、歯面と歯底面の間の隅肉曲線の曲率半径を小径端部から大径端部へ向けて漸次増大させているので、小径端側の歯元強度が一番低く、傘歯車を大型化することなく小径端側の歯元強度を向上させることが難しい。また、特許文献2に記載の傘歯車(ピニオンギヤ及びサイドギヤ)では、小径端側の歯底部が歯底円錐よりも径方向の外側に配置されているので、その分だけ小径端側の断面積が増大するが、それでも小径端側の歯元強度を十分に確保できない可能性がある。   By the way, the bevel gear may want to improve the tooth root strength (strength of the tooth root portion) on the small diameter end side depending on the usage mode. However, in the bevel gear described in Patent Document 1, the radius of curvature of the fillet curve between the tooth surface and the tooth bottom surface is gradually increased from the small diameter end portion toward the large diameter end portion. The original strength is the lowest, and it is difficult to improve the tooth root strength on the small diameter end side without increasing the size of the bevel gear. In addition, in the bevel gear (pinion gear and side gear) described in Patent Document 2, the root portion on the small diameter end side is arranged on the outer side in the radial direction from the root cone, so that the cross-sectional area on the small diameter end side is correspondingly increased. However, there is a possibility that the tooth root strength on the small diameter end side cannot be sufficiently secured.

そこで、本発明は、小径端側の歯元強度を確保することが可能な傘歯車の提供を目的とする。   Accordingly, an object of the present invention is to provide a bevel gear capable of ensuring the tooth root strength on the small diameter end side.

上記課題を解決するため、本発明の傘歯車は、歯底円錐面から突出する複数の歯と、複数の歯のうちの隣り合う歯の相対向する歯面の間に配置されて小径端と大径端との間で延びる歯底部とを有し、歯底部は、第1歯底部と第2歯底部とを備える。第1歯底部は、第1歯底面と1対の第1曲面とを有し、歯底部のうちの小径端側の端部に配置され、歯底円錐面よりも径方向の外側で軸方向と略平行に延びる。第1歯底面は、第1歯底部の幅方向の中央部で軸方向と略平行に延びる。1対の第1曲面は、第1歯底面の幅方向の両側に配置されて第1歯底面と幅方向の両側の歯面とを連結する。第2歯底部は、第2歯底面と1対の第2曲面とを有し、第1歯底部から連続して歯底円錐面に沿って大径端側へ延びる。第2歯底面は、第2歯底部の幅方向の中央部で歯底円錐面に沿って延びる。1対の第2曲面は、第2歯底面の幅方向の両側に配置されて第2歯底面と歯面とを連結する。第1歯底部のうちの小径端側の端部の第1曲面の曲率半径は、第1歯底部と第2歯底部との接続部側の端部の第1曲面の曲率半径よりも大きい。   In order to solve the above-described problem, a bevel gear according to the present invention includes a plurality of teeth protruding from the root conical surface, and a small diameter end disposed between opposing tooth surfaces of adjacent teeth among the plurality of teeth. The tooth bottom portion extends between the large diameter end, and the tooth bottom portion includes a first tooth bottom portion and a second tooth bottom portion. The first tooth bottom portion has a first tooth bottom surface and a pair of first curved surfaces, and is disposed at an end portion on the small diameter end side of the tooth bottom portion, and is axially outside in a radial direction with respect to the tooth bottom conical surface. And extend substantially parallel to the The first tooth bottom surface extends substantially parallel to the axial direction at the center in the width direction of the first tooth bottom portion. The pair of first curved surfaces are arranged on both sides in the width direction of the first tooth bottom surface, and connect the first tooth bottom surface and the tooth surfaces on both sides in the width direction. The second tooth bottom portion has a second tooth bottom surface and a pair of second curved surfaces, and extends from the first tooth bottom portion to the large diameter end side along the tooth bottom conical surface. The second tooth bottom surface extends along the tooth bottom conical surface at the center in the width direction of the second tooth bottom portion. The pair of second curved surfaces are arranged on both sides in the width direction of the second tooth bottom surface and connect the second tooth bottom surface and the tooth surface. The radius of curvature of the first curved surface at the end portion on the small diameter end side of the first tooth bottom portion is larger than the curvature radius of the first curved surface at the end portion on the connection portion side between the first tooth bottom portion and the second tooth bottom portion.

上記構成では、第1歯底部が、歯底円錐面よりも径方向の外側で軸方向と略平行に延びる。このため、第1歯底部を第2歯底部と同様に歯底円錐面に沿って延ばす場合に比べ、歯底円錐面よりも径方向の外側に第1歯底部が配置される分だけ小径端側の断面積を増大させることができ、小径端側の強度を確保することができる。   In the above configuration, the first tooth bottom portion extends substantially parallel to the axial direction on the outer side in the radial direction than the tooth bottom conical surface. For this reason, as compared with the case where the first tooth bottom portion is extended along the tooth bottom conical surface in the same manner as the second tooth bottom portion, the end of the small diameter is as much as the first tooth bottom portion is arranged on the outer side in the radial direction from the tooth bottom conical surface. The cross-sectional area on the side can be increased, and the strength on the small diameter end side can be ensured.

また、第1歯底部のうちの小径端側の端部の第1曲面の曲率半径が、第1歯底部と第2歯底部との接続部側の端部の第1曲面の曲率半径よりも大きいので、傘歯車の小径端側の歯元強度を確保することができる。   Further, the radius of curvature of the first curved surface of the end portion on the small diameter end side of the first tooth bottom portion is larger than the radius of curvature of the first curved surface of the end portion on the connection portion side between the first tooth bottom portion and the second tooth bottom portion. Since it is large, the tooth root strength on the small diameter end side of the bevel gear can be secured.

また、第1歯底部が、歯底円錐面よりも径方向の外側で軸方向と略平行に延びる。傘歯車では、隣り合う歯の相対向する歯面が歯元側から歯先側へ向かって互いに離間する方向へ延びるので、第1歯底部のうちの小径端側の端部の幅を、第1歯底部と第2歯底部との接続部の幅よりも広く確保することができる。このため、確実に小径端側の端部の第1曲面の曲率半径を大きくすることができ、傘歯車の小径端側の歯元強度を確保することができる。   Further, the first tooth bottom portion extends substantially parallel to the axial direction on the outer side in the radial direction from the tooth bottom conical surface. In the bevel gear, the tooth surfaces facing each other adjacent teeth extend in the direction away from the tooth base side toward the tooth tip side, so the width of the end portion on the small diameter end side of the first tooth bottom portion is set to It can be ensured wider than the width of the connecting portion between the 1 tooth bottom portion and the second tooth bottom portion. For this reason, the curvature radius of the 1st curved surface of the edge part by the side of a small diameter end can be enlarged reliably, and the tooth root intensity | strength by the side of the small diameter end of a bevel gear can be ensured.

本発明によれば、傘歯車の小径端側の歯元部分の強度を確保することができる。   According to the present invention, the strength of the tooth root portion on the small diameter end side of the bevel gear can be ensured.

本発明の一実施形態に係る傘歯車の斜視図である。It is a perspective view of the bevel gear concerning one embodiment of the present invention. 図1のII−II矢視断面図である。It is II-II arrow sectional drawing of FIG. 歯底部の各所の概略断面図であり、(a)は歯底部の小径端側の端部の断面図、(b)は歯底部の接続部の断面図、(c)は歯底部の大径端側の端部の断面図である。It is a schematic sectional drawing of various parts of a tooth bottom part, (a) is a sectional view of the edge part by the side of the small diameter end of a tooth bottom part, (b) is a sectional view of a connecting part of a tooth bottom part, (c) is a large diameter of a tooth bottom part. It is sectional drawing of the edge part of an end side.

以下、本発明の一実施形態を図面に基づいて説明する。なお、図2の一点鎖線CLは傘歯車10の回転軸(軸芯)を示す。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 2 indicates the rotational axis (axial core) of the bevel gear 10.

図1及び図2に示すように、本実施形態に係る傘歯車10は、歯すじが直線状に延びるすぐばかさ歯車であって、自動車のディファレンシャルギヤ等に用いられる。傘歯車10は、回転軸CLの軸方向(以下、単に軸方向という)の一側(小径端2側)の一端面11と、軸方向の他側(大径端3側)の他端面12とを有する。   As shown in FIGS. 1 and 2, a bevel gear 10 according to the present embodiment is a straight bevel gear whose tooth line extends linearly, and is used for a differential gear of an automobile or the like. The bevel gear 10 has one end surface 11 on one side (small diameter end 2 side) in the axial direction of the rotation shaft CL (hereinafter simply referred to as the axial direction) and the other end surface 12 on the other side in the axial direction (large diameter end 3 side). And have.

傘歯車10の複数(本実施形態では、9つ)の歯13は、歯底円錐面14から径方向の外側へ突出し、小径端2から大径端3へ向かって歯底円錐面14上の母線(歯底円錐の母線)の方向に沿って直線状に延びる。歯13は、その歯厚が小径端2から大径端3へ向かうほど徐々に大きく、且つ歯先4から歯元5へ向かうほど徐々に大きくなるように形成される。複数の歯13のうちの隣り合う歯13の相対向する歯面13a,13bは、歯元5側(歯底円錐面14側)から歯先4側へ向かって互いに離間する方向へ延びる。傘歯車10は、相対向する歯面13a,13bの間に複数(本実施形態では、9つ)の歯底部15を備える。なお、複数の歯底部15は、同様の構成を有するため、以下では、一の歯底部15について説明し、他の歯底部15の説明を省略する。   A plurality of (in this embodiment, nine) teeth 13 of the bevel gear 10 protrude radially outward from the root conical surface 14 and are on the bottom conical surface 14 from the small diameter end 2 toward the large diameter end 3. It extends linearly along the direction of the generatrix (the generatrix of the root cone). The teeth 13 are formed such that the tooth thickness gradually increases from the small diameter end 2 toward the large diameter end 3 and gradually increases from the tooth tip 4 toward the tooth root 5. Opposing tooth surfaces 13a and 13b of adjacent teeth 13 among the plurality of teeth 13 extend in a direction away from the tooth base 5 side (the root conical surface 14 side) toward the tooth tip 4 side. The bevel gear 10 includes a plurality (nine in this embodiment) of tooth bottom portions 15 between the tooth surfaces 13a and 13b facing each other. In addition, since the several tooth bottom part 15 has the same structure, below, the one tooth bottom part 15 is demonstrated and description of the other tooth bottom part 15 is abbreviate | omitted.

図1〜図3に示すように、歯底部15は、歯底部15のうちの小径端2側の端部に配置されて軸方向と略平行に延びる第1歯底部16と、第1歯底部16の他側の端部(後述する接続部18)から大径端3へ向かって歯底円錐面14上の母線の方向に沿って延びる第2歯底部17とを有し、小径端2と大径端3との間(本実施形態では、小径端2から大径端3の近傍まで)で延びる。なお、軸方向と略平行に延びるとは、軸方向と完全に平行に延びる場合に限定されず、例えば、傘歯車を鍛造する場合に金型から取り出し易くするために、第1歯底部16を軸方向の他側から一側の回転軸側へ僅かに傾斜させてもよいし、或いは、図2に示すように、第1歯底部16の小径端2側の角部を丸く面取りしてもよい。   As shown in FIGS. 1 to 3, the tooth bottom portion 15 includes a first tooth bottom portion 16 that is disposed at an end portion on the small diameter end 2 side of the tooth bottom portion 15 and extends substantially parallel to the axial direction, and a first tooth bottom portion. 16 has a second tooth bottom portion 17 extending along the direction of the generatrix on the tooth bottom conical surface 14 from the other end portion (connecting portion 18 described later) to the large diameter end 3, and the small diameter end 2 It extends between the large diameter end 3 (in this embodiment, from the small diameter end 2 to the vicinity of the large diameter end 3). It should be noted that extending substantially parallel to the axial direction is not limited to the case of extending completely parallel to the axial direction. For example, in order to facilitate removal from the mold when forging a bevel gear, the first tooth bottom 16 is formed. You may make it incline slightly from the other side of an axial direction to the one rotating shaft side, or, as shown in FIG. 2, the corner | angular part by the side of the small diameter end 2 of the 1st tooth bottom part 16 may be chamfered roundly. Good.

第2歯底部17は、その幅方向の中央部で歯底円錐面14に沿って延びる歯底面(第2歯底面)19と、該歯底面19の幅方向の両端と歯面13a,13bとを連結する1対の隅肉曲面(第2曲面)20a,20bとによって構成される。第2歯底部17の幅は、第1歯底部16との接続部18側(小径端2側)から大径端3側へ向かって徐々に拡大している。すなわち、第2歯底部17のうちの大径端3側の端部の幅L3は、第1歯底部16との接続部18側の端部の幅L2よりも大きい(L3>L2)。第2歯底部17の歯底面19は、両側の隅肉曲面20a,20bとの間で僅かに露出する歯底円錐面14上の一部の領域である。第2歯底部17の隅肉曲面20a,20bは、歯底円錐面14と歯面13a,13bとが交叉する部分に設けられた隅肉部21の表面である。第2歯底部17の隅肉曲面20a,20bと歯面13a,13bとの境界線は、直線状に延びる。第2歯底部17の隅肉曲面20a,20bの曲率半径は、第1歯底部16との接続部18側(小径端2側)から大径端3側へ向かって徐々に増大している。すなわち、第2歯底部17のうちの大径端3側の端部(図3(c)参照)の隅肉曲面20a,20bの曲率半径R3は、第1歯底部16との接続部18側の端部(図3(b)参照)の隅肉曲面20a,20bの曲率半径R2よりも大きい(R3>R2)。   The second tooth bottom portion 17 includes a tooth bottom surface (second tooth bottom surface) 19 extending along the tooth bottom conical surface 14 at the center in the width direction, both ends of the tooth bottom surface 19 in the width direction, and tooth surfaces 13a and 13b. Are constituted by a pair of fillet curved surfaces (second curved surfaces) 20a, 20b. The width of the second tooth bottom portion 17 gradually increases from the connecting portion 18 side (small diameter end 2 side) to the first tooth bottom portion 16 toward the large diameter end 3 side. That is, the width L3 of the end portion on the large diameter end 3 side of the second tooth bottom portion 17 is larger than the width L2 of the end portion on the connection portion 18 side with the first tooth bottom portion 16 (L3> L2). The tooth bottom surface 19 of the second tooth bottom portion 17 is a partial region on the tooth bottom conical surface 14 that is slightly exposed between the fillet curved surfaces 20a and 20b on both sides. The fillet curved surfaces 20a and 20b of the second tooth bottom part 17 are the surfaces of the fillet part 21 provided at the intersection of the tooth bottom conical surface 14 and the tooth surfaces 13a and 13b. The boundary lines between the fillet curved surfaces 20a, 20b of the second tooth bottom portion 17 and the tooth surfaces 13a, 13b extend linearly. The curvature radii of the fillet curved surfaces 20a and 20b of the second tooth bottom portion 17 gradually increase from the connecting portion 18 side (small diameter end 2 side) to the first tooth bottom portion 16 toward the large diameter end 3 side. That is, the curvature radius R3 of the fillet curved surfaces 20a and 20b of the end portion on the large diameter end 3 side of the second tooth bottom portion 17 (see FIG. 3C) is the connection portion 18 side with the first tooth bottom portion 16. Is larger than the radius of curvature R2 of the fillet curved surfaces 20a, 20b at the end (see FIG. 3B) (R3> R2).

第1歯底部16は、その幅方向の中央部で軸方向と略平行に延びる歯底面(第1歯底面)22と、該歯底面22の幅方向の両端と歯面13a,13bとを連結する1対の隅肉曲面(第1曲面)23a,23bとによって構成され、歯底円錐面14よりも径方向の外側で軸方向と略平行に延びる。第1歯底部16の幅は、第2歯底部17との接続部18側(大径端3側)から小径端2側へ向かって徐々に拡大している。すなわち、第1歯底部16のうちの小径端2側の端部の幅L1は、第2歯底部17との接続部18側の端部の幅L2よりも大きい(L1>L2)。また、第1歯底部16のうちの小径端2側の端部の幅L1は、第2歯底部17のうちの大径端3側の端部の幅L3よりも小さい(L1<L3)。すなわち、歯底部15の幅は、L3>L1>L2に設定される。第1歯底部16の歯底面22は、第2歯底部17の歯底面19の一側の端部から曲折して小径端2側へ、歯底円錐面14よりも径方向の外側で軸方向と略平行に延びる。第1歯底部16の隅肉曲面23a,23bは、歯底面22を幅方向の両側へ延長した仮想面24と歯面13a,13bとが交叉する部分に設けられた隅肉部25の表面である。第1歯底部16の隅肉曲面23a,23bと歯面13a,13bとの境界線は、直線状に延びる。第1歯底部16の隅肉曲面23a,23bと、第2歯底部17の隅肉曲面20a,20bとは、接続部18で接続されており、各々の接続部18側の端部の曲率半径は略同一の大きさを有する。第1歯底部16の隅肉曲面23a,23bの曲率半径は、第2歯底部17との接続部18側(大径端3側)から小径端2側へ向かって徐々に増大している。すなわち、第1歯底部16のうちの小径端2側の端部(図3(a)参照)の隅肉曲面23a,23bの曲率半径R1は、第2歯底部17との接続部18側の端部(図3(b)参照)の隅肉曲面23a,23bの曲率半径R2よりも大きい(R1>R2)。また、第1歯底部16のうちの小径端2側の端部(図3(a)参照)の隅肉曲面23a,23bの曲率半径R1は、第2歯底部17のうちの大径端3側の端部(図3(c)参照)の隅肉曲面20a,20bの曲率半径R3よりも小さい(R1<R3)。すなわち、歯底部15の隅肉曲面の曲率半径は、R3>R1>R2に設定される。   The first tooth bottom portion 16 connects a tooth bottom surface (first tooth bottom surface) 22 extending substantially parallel to the axial direction at the center in the width direction, and both ends of the tooth bottom surface 22 in the width direction and the tooth surfaces 13a and 13b. And a pair of fillet curved surfaces (first curved surfaces) 23a, 23b, which extend substantially parallel to the axial direction on the outer side in the radial direction than the bottom cone surface 14. The width of the first tooth bottom portion 16 gradually increases from the connecting portion 18 side (large diameter end 3 side) to the second tooth bottom portion 17 toward the small diameter end 2 side. That is, the width L1 of the end portion on the small diameter end 2 side of the first tooth bottom portion 16 is larger than the width L2 of the end portion on the connection portion 18 side with the second tooth bottom portion 17 (L1> L2). The width L1 of the end portion on the small diameter end 2 side of the first tooth bottom portion 16 is smaller than the width L3 of the end portion on the large diameter end 3 side of the second tooth bottom portion 17 (L1 <L3). That is, the width of the tooth bottom portion 15 is set to L3> L1> L2. The tooth bottom surface 22 of the first tooth bottom portion 16 is bent from one end portion of the tooth bottom surface 19 of the second tooth bottom portion 17 to the small diameter end 2 side, and is axially outward from the tooth bottom conical surface 14 in the radial direction. And extend substantially parallel to the The fillet curved surfaces 23a and 23b of the first tooth bottom portion 16 are the surfaces of the fillet portion 25 provided at a portion where the virtual surface 24 obtained by extending the tooth bottom surface 22 to both sides in the width direction and the tooth surfaces 13a and 13b intersect. is there. The boundary lines between the fillet curved surfaces 23a and 23b of the first tooth bottom portion 16 and the tooth surfaces 13a and 13b extend linearly. The fillet curved surfaces 23a and 23b of the first tooth bottom portion 16 and the fillet curved surfaces 20a and 20b of the second tooth bottom portion 17 are connected by the connection portion 18, and the radius of curvature of the end portion on each connection portion 18 side is connected. Have substantially the same size. The radii of curvature of the fillet curved surfaces 23a and 23b of the first tooth bottom portion 16 gradually increase from the connecting portion 18 side (large diameter end 3 side) to the second tooth bottom portion 17 toward the small diameter end 2 side. That is, the curvature radius R1 of the fillet curved surfaces 23a, 23b of the end portion on the small diameter end 2 side of the first tooth bottom portion 16 (see FIG. 3A) is set on the side of the connecting portion 18 with the second tooth bottom portion 17. It is larger than the radius of curvature R2 of the fillet curved surfaces 23a, 23b at the ends (see FIG. 3B) (R1> R2). Further, the curvature radius R1 of the fillet curved surfaces 23a, 23b of the end portion on the small diameter end 2 side of the first tooth bottom portion 16 (see FIG. 3A) is the large diameter end 3 of the second tooth bottom portion 17. It is smaller than the radius of curvature R3 of the fillet curved surfaces 20a, 20b of the side end (see FIG. 3C) (R1 <R3). That is, the curvature radius of the fillet curved surface of the tooth bottom portion 15 is set to R3> R1> R2.

上記のように構成された傘歯車10では、第1歯底部16が、歯底円錐面14よりも径方向の外側で軸方向と略平行に延びる。このため、第1歯底部16を第2歯底部17と同様に歯底円錐面14に沿って延ばす場合に比べ、歯底円錐面14よりも径方向の外側に第1歯底部16が配置される分だけ小径端2側の断面積を増大させることができ、傘歯車10の小径端2側の強度を確保することができる。   In the bevel gear 10 configured as described above, the first tooth bottom portion 16 extends substantially parallel to the axial direction on the radially outer side than the tooth bottom conical surface 14. Therefore, as compared with the case where the first tooth bottom portion 16 extends along the tooth bottom conical surface 14 in the same manner as the second tooth bottom portion 17, the first tooth bottom portion 16 is disposed on the outer side in the radial direction from the tooth bottom conical surface 14. As a result, the cross-sectional area on the small diameter end 2 side can be increased, and the strength on the small diameter end 2 side of the bevel gear 10 can be ensured.

また、第1歯底部16の隅肉曲面23a,23bの曲率半径は、第2歯底部17との接続部18側(大径端3側)から小径端2側へ向かって徐々に増大している。このように、第1歯底部16のうちの小径端2側の端部の隅肉曲面23a,23bの曲率半径R1が、第2歯底部17との接続部18側の端部の隅肉曲面23a,23bの曲率半径R2よりも大きいので、傘歯車10の小径端2側の歯元強度を確保することができる。   Further, the curvature radii of the fillet curved surfaces 23a and 23b of the first tooth bottom portion 16 gradually increase from the connecting portion 18 side (large diameter end 3 side) to the second tooth bottom portion 17 toward the small diameter end 2 side. Yes. Thus, the curvature radius R1 of the fillet curved surfaces 23a, 23b at the end on the small diameter end 2 side of the first tooth bottom portion 16 is the fillet curved surface at the end on the connection portion 18 side with the second tooth bottom portion 17. Since it is larger than the curvature radius R2 of 23a, 23b, the tooth root strength on the small diameter end 2 side of the bevel gear 10 can be ensured.

また、第1歯底部16のうちの小径端2側の端部の幅L1が、第2歯底部17との接続部18側の端部の幅L2よりも大きい。このため、確実に小径端2側の端部の隅肉曲面23a,23bの曲率半径R1を大きくすることができ、傘歯車10の小径端2側の歯元強度を確保することができる。   Further, the width L1 of the end portion on the small diameter end 2 side of the first tooth bottom portion 16 is larger than the width L2 of the end portion on the connection portion 18 side with the second tooth bottom portion 17. For this reason, the curvature radius R1 of the fillet curved surfaces 23a and 23b at the end on the small diameter end 2 side can be reliably increased, and the tooth root strength on the small diameter end 2 side of the bevel gear 10 can be secured.

従って、本実施形態によれば、傘歯車10の小径端2側の歯元部分の強度を確保することができる。   Therefore, according to the present embodiment, the strength of the tooth root portion on the small diameter end 2 side of the bevel gear 10 can be ensured.

また、第2歯底部17の隅肉曲面20a,20bの曲率半径が、第1歯底部16との接続部18側(小径端2側)から大径端3側へ向かって徐々に増大している。このように、第2歯底部17のうちの大径端3側の端部の隅肉曲面20a,20bの曲率半径R3が、第1歯底部16との接続部18側の端部の隅肉曲面20a,20bの曲率半径R2よりも大きいので、傘歯車10の大径端3側の歯元強度を確保することができる。   Further, the curvature radius of the fillet curved surfaces 20a, 20b of the second tooth bottom portion 17 gradually increases from the connecting portion 18 side (small diameter end 2 side) to the first tooth bottom portion 16 toward the large diameter end 3 side. Yes. Thus, the curvature radius R3 of the fillet curved surfaces 20a, 20b at the end portion on the large diameter end 3 side of the second tooth bottom portion 17 is the fillet at the end portion on the connection portion 18 side with the first tooth bottom portion 16. Since it is larger than the curvature radius R2 of the curved surfaces 20a, 20b, the tooth root strength on the large diameter end 3 side of the bevel gear 10 can be ensured.

また、第1歯底部16の隅肉曲面23a,23bの曲率半径が、第2歯底部17との接続部18側(大径端3側)から小径端2側へ向かって徐々に増大し、且つ第2歯底部17の隅肉曲面20a,20bの曲率半径が、第1歯底部16との接続部18側(小径端2側)から大径端3側へ向かって徐々に増大している。このため、歯元強度は、第1歯底部16と第2歯底部17との接続部18から小径端2側へ向かって徐々に増大し、且つ接続部18から大径端3側へ向かって徐々に増大する。   Further, the radius of curvature of the fillet curved surfaces 23a, 23b of the first tooth bottom portion 16 gradually increases from the connecting portion 18 side (large diameter end 3 side) to the second tooth bottom portion 17 toward the small diameter end 2 side, Further, the radius of curvature of the fillet curved surfaces 20a, 20b of the second tooth bottom portion 17 gradually increases from the connecting portion 18 side (small diameter end 2 side) to the first tooth bottom portion 16 toward the large diameter end 3 side. . For this reason, the tooth root strength gradually increases from the connecting portion 18 between the first tooth bottom portion 16 and the second tooth bottom portion 17 toward the small diameter end 2 side and from the connecting portion 18 toward the large diameter end 3 side. Increase gradually.

なお、本実施形態では、第2歯底部17のうちの大径端3側の端部の幅L3を、第1歯底部16との接続部18側の端部の幅L2よりも大きくし、第2歯底部17のうちの大径端3側の端部の隅肉曲面20a,20bの曲率半径R3を、第1歯底部16との接続部18側の端部の隅肉曲面20a,20bの曲率半径R2よりも大きくしたが、第2歯底部17の形状は、これに限定するものではない。例えば、第2歯底部17の幅を小径端2側と大径端3側との間で略同じ幅に設定し、隅肉曲面20a,20bの曲率半径を小径端2側と大径端3側との間で略同じ大きさに設定してもよい。   In the present embodiment, the width L3 of the end portion on the large diameter end 3 side of the second tooth bottom portion 17 is made larger than the width L2 of the end portion on the connection portion 18 side with the first tooth bottom portion 16, The curvature radius R3 of the fillet curved surfaces 20a, 20b at the end on the large diameter end 3 side of the second tooth bottom portion 17 is set to the fillet curved surfaces 20a, 20b at the end on the connection portion 18 side with the first tooth bottom portion 16. However, the shape of the second tooth bottom portion 17 is not limited to this. For example, the width of the second tooth bottom portion 17 is set to be substantially the same between the small diameter end 2 side and the large diameter end 3 side, and the curvature radii of the fillet curved surfaces 20a and 20b are set to the small diameter end 2 side and the large diameter end 3 respectively. You may set to the substantially same magnitude | size between sides.

また、本実施形態では、歯底部15は、歯底部15のうちの小径端2側の端部に配置される第1歯底部16と、第1歯底部16の他側の端部から大径端3へ向かって歯底円錐面14上の母線の方向に沿って延びる第2歯底部17とを有したが、歯底部15は、第1歯底部16と第2歯底部17とに加えて、第2歯底部17の他側の端部から径方向の外側へ延びて、歯底円錐面14よりも径方向の外側に配置される第3歯底部を、傘歯車10の大径端3側の端部に有してもよい。   Further, in the present embodiment, the tooth bottom portion 15 has a large diameter from the first tooth bottom portion 16 disposed at the end on the small diameter end 2 side of the tooth bottom portion 15 and the end portion on the other side of the first tooth bottom portion 16. Although it has the 2nd tooth bottom part 17 extended along the direction of the generatrix on the tooth bottom conical surface 14 toward the edge 3, the tooth bottom part 15 is added to the 1st tooth bottom part 16 and the 2nd tooth bottom part 17 in addition to it. The third tooth bottom portion extending from the other end portion of the second tooth bottom portion 17 to the outside in the radial direction and disposed outside the tooth bottom conical surface 14 in the radial direction is connected to the large diameter end 3 of the bevel gear 10. You may have in the edge part of the side.

また、本実施形態では、第1歯底部16の隅肉曲面23a,23bの接続部18側の端部の曲率半径と、第2歯底部17の隅肉曲面20a,20bの接続部18側の端部の曲率半径とが略同一の大きさ(R2)であったが、これに限定されるものではない。   Moreover, in this embodiment, the curvature radius of the edge part by the side of the connection part 18 of the fillet curved surface 23a, 23b of the 1st tooth bottom part 16 and the connection part 18 side of the fillet curved surface 20a, 20b of the 2nd tooth bottom part 17 are provided. The radius of curvature at the end is substantially the same size (R2), but is not limited to this.

以上、本発明について、上記実施形態に基づいて説明を行ったが、本発明は上記実施形態の内容に限定されるものではなく、当然に本発明を逸脱しない範囲で適宜変更が可能である。すなわち、この実施形態に基づいて当業者等によりなされる他の実施形態、実施例および運用技術等は全て本発明の範疇に含まれることは勿論である。   As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to the content of the said embodiment, Of course, it can change suitably in the range which does not deviate from this invention. That is, it is needless to say that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

2:小径端
3:大径端
10:傘歯車
13:複数の歯
13a,13b:歯面
14:歯底円錐面
15:歯底部
16:第1歯底部
17:第2歯底部
18:接続部
19:第2歯底部の歯底面(第2歯底面)
20a,20b:第2歯底部の1対の隅肉曲面(第2曲面)
22:第1歯底部の歯底面(第1歯底面)
23a,23b:第1歯底部の1対の隅肉曲面(第1曲面)
2: Small diameter end 3: Large diameter end 10: Bevel gear 13: Plural teeth 13a, 13b: Tooth surface 14: Tooth conical surface 15: Tooth bottom portion 16: First tooth bottom portion 17: Second tooth bottom portion 18: Connection portion 19: Second tooth bottom surface (second tooth bottom surface)
20a, 20b: a pair of fillet curved surfaces (second curved surface) of the second tooth bottom
22: Bottom surface of the first tooth bottom (first bottom surface)
23a, 23b: a pair of fillet curved surfaces (first curved surface) of the first tooth bottom

Claims (1)

歯底円錐面から突出する複数の歯と、前記複数の歯のうちの隣り合う歯の相対向する歯面の間に配置されて小径端と大径端との間で延びる歯底部とを有する傘歯車であって、
前記歯底部は、
前記歯底部のうちの前記小径端側の端部に配置され、前記歯底円錐面よりも径方向の外側で軸方向と略平行に延びる第1歯底部と、
前記第1歯底部から連続して前記歯底円錐面に沿って前記大径端側へ延びる第2歯底部と、を備え、
前記第1歯底部は、幅方向の中央部で軸方向と略平行に延びる第1歯底面と、前記第1歯底面の幅方向の両側に配置されて前記第1歯底面と幅方向の両側の歯面とを連結する1対の第1曲面とを有し、
前記第2歯底部は、幅方向の中央部で前記歯底円錐面に沿って延びる第2歯底面と、前記第2歯底面の幅方向の両側に配置されて前記第2歯底面と前記歯面とを連結する1対の第2曲面とを有し、
前記第1歯底部のうちの前記小径端側の端部の前記第1曲面の曲率半径は、前記第1歯底部と前記第2歯底部との接続部側の端部の前記第1曲面の曲率半径よりも大きい
ことを特徴とする傘歯車。
A plurality of teeth projecting from the conical surface of the root, and a tooth bottom portion disposed between the opposing tooth surfaces of the adjacent teeth of the plurality of teeth and extending between the small diameter end and the large diameter end A bevel gear,
The tooth bottom is
A first tooth bottom portion disposed at an end portion on the small diameter end side of the tooth bottom portion and extending substantially parallel to the axial direction on the outer side in the radial direction than the tooth bottom conical surface;
A second tooth bottom portion extending continuously from the first tooth bottom portion along the tooth bottom conical surface toward the large diameter end, and
The first tooth bottom portion is disposed at both sides of the first tooth bottom surface in the width direction and the first tooth bottom surface extending substantially parallel to the axial direction at both sides in the width direction of the first tooth bottom surface. A pair of first curved surfaces connecting the tooth surfaces of
The second tooth bottom portion is disposed at both sides in the width direction of the second tooth bottom surface with a second tooth bottom surface extending along the tooth bottom conical surface at a center portion in the width direction, and the second tooth bottom surface and the tooth. A pair of second curved surfaces connecting the surfaces,
The radius of curvature of the first curved surface of the end portion on the small diameter end side of the first tooth bottom portion is the radius of curvature of the first curved surface of the end portion on the connection portion side between the first tooth bottom portion and the second tooth bottom portion. A bevel gear characterized by being larger than the radius of curvature.
JP2016136064A 2016-07-08 2016-07-08 Umbrella gear Pending JP2018004053A (en)

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CN201710551147.3A CN107588178A (en) 2016-07-08 2017-07-07 Bevel gear

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CN109130846A (en) * 2018-09-05 2019-01-04 重庆雄狮机械有限责任公司 A kind of motor-driven power transmission apparatus in orchard
CN110864100B (en) * 2019-10-25 2024-04-05 南京理工大学 Bevel gear with tooth root variable radius transition fillet

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JPS6034569A (en) * 1983-05-17 1985-02-22 Hino Motors Ltd Differential pinion
JP3687556B2 (en) * 2001-03-30 2005-08-24 日産自動車株式会社 Bevel gear and manufacturing method thereof
JP2003048124A (en) * 2001-08-07 2003-02-18 Kanzaki Kokyukoki Mfg Co Ltd Manufacturing method for die or electrical discharge machining electrode
DE102006015521B3 (en) * 2006-03-31 2007-04-12 ThyssenKrupp Präzisionsschmiede GmbH Tooth formation for evolvent rolled-tooth gear wheel has ellipse in tooth foot region with semi-axes of different lengths
JP5391396B2 (en) * 2008-11-28 2014-01-15 株式会社エンプラス gear
CN102359569A (en) * 2011-09-09 2012-02-22 江苏飞船股份有限公司 Teeth part strengthening structure of spiral bevel gear

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