JP2018021648A

JP2018021648A - Gear structure

Info

Publication number: JP2018021648A
Application number: JP2016154837A
Authority: JP
Inventors: 飯島　章; Akira Iijima; 章飯島
Original assignee: Isuzu Motors Ltd
Current assignee: Isuzu Motors Ltd
Priority date: 2016-08-05
Filing date: 2016-08-05
Publication date: 2018-02-08

Abstract

PROBLEM TO BE SOLVED: To provide a gear structure capable of reducing possibility of generating torsional resonance while reducing compliance.SOLUTION: A gear structure is a structure of a gear that moves in a rotation direction and where a plurality of relief holes are provided along the rotational direction. The gear structure has a weight member fitted into the relief hole, and an elastic member provided on a peripheral edge of the relief hole, supporting the weight member from both sides in the rotational direction and having elasticity. For example, the weight member is configured to suppress deterioration of inertial moment of the gear due to the relief holes.SELECTED DRAWING: Figure 1

Description

本開示は、ギヤの構造に関する。 The present disclosure relates to the structure of a gear.

従来、ギヤのかみ合い音を低減するため、ギヤに周方向に沿って肉盗み穴（肉抜き穴とも称される）を設け、肉盗み穴を大きくすることにより、ギヤの剛性を低下させて、振動の伝達を低減していた。 Conventionally, in order to reduce gear meshing noise, a gear stealing hole (also referred to as a lightening hole) is provided in the circumferential direction of the gear, and by increasing the meat stealing hole, the rigidity of the gear is reduced, Reduced vibration transmission.

異音の発生を抑制するためのギヤであるが、ギヤに周方向に沿って肉盗み穴を設けた技術が開示されている（例えば、特許文献１参照）。 Although it is a gear for suppressing generation | occurrence | production of unusual noise, the technique which provided the meat stealing hole along the circumferential direction is disclosed (for example, refer patent document 1).

特開２０１５−１７２４３６号公報JP, 2015-172436, A

しかしながら、特許文献１に開示された技術では、肉盗み穴を大きくすることによって、ギヤの慣性モーメントが低下し、慣性モーメントの低下に応じて、ギヤにおけるねじり振動の固有振動数が上昇して、ねじり共振を発生させる可能性が高まるという問題点があった。 However, in the technique disclosed in Patent Document 1, by increasing the thickness of the steal hole, the inertia moment of the gear decreases, and the natural frequency of torsional vibration in the gear increases according to the decrease of the inertia moment, There is a problem that the possibility of generating torsional resonance increases.

本開示の目的は、コンプライアンスを下げながら、ねじり共振を発生させる可能性を低減することが可能なギヤの構造を提供することである。 An object of the present disclosure is to provide a gear structure capable of reducing the possibility of generating torsional resonance while lowering compliance.

本開示のギヤの構造は、
回転方向に運動し、当該回転方向に沿って複数の肉盗み穴が設けられるギヤの構造において、
前記肉盗み穴に嵌合される錘部材と、
前記肉盗み穴の周縁に設けられ、前記錘部材を前記回転方向の両側から支持する、弾性を有する弾性部材と、を有する。 The structure of the gear of the present disclosure is as follows:
In the structure of the gear that moves in the rotation direction and is provided with a plurality of meat steal holes along the rotation direction,
A weight member fitted into the meat stealing hole;
An elastic member having elasticity, which is provided at a peripheral edge of the meat stealing hole and supports the weight member from both sides in the rotation direction.

本開示のギヤの構造によれば、コンプライアンスを下げながら、ねじり共振を発生させる可能性を低減することができる。 According to the gear structure of the present disclosure, it is possible to reduce the possibility of generating torsional resonance while lowering compliance.

本開示の一実施の形態にかかるギヤの構造の一例を示す図The figure which shows an example of the structure of the gear concerning one embodiment of this indication 図１のＩＩ−ＩＩ線断面図II-II sectional view of FIG. 図１のＩＩＩ-ＩＩＩ線断面図III-III sectional view of FIG.

以下、本発明の一実施の形態について、図面を参照して詳細に説明する。 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

＜ギヤの構造＞
まず、本開示の一実施の形態にかかるギヤの構造について説明する。 <Gear structure>
First, the structure of a gear according to an embodiment of the present disclosure will be described.

図１は、本開示の一実施の形態にかかるギヤ１の構造１００の一例を示す図である。図２は、図１のＩＩ−ＩＩ線断面図である。図１にギヤ１の周方向ｃを示し、また、ギヤ１の径方向ｒを示す。図２にギヤ１の軸方向ｚを示す。周方向ｃはギヤ１の回転方向に相当する。また、軸方向ｚは、ギヤ１の板厚方向と平行な方向である。 FIG. 1 is a diagram illustrating an example of a structure 100 of a gear 1 according to an embodiment of the present disclosure. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 1 shows a circumferential direction c of the gear 1 and a radial direction r of the gear 1. FIG. 2 shows the axial direction z of the gear 1. The circumferential direction c corresponds to the rotation direction of the gear 1. The axial direction z is a direction parallel to the plate thickness direction of the gear 1.

図１に示すように、ギヤ１の構造１００は、ギヤ１と、錘部材２と、弾性部材３と、を備える。 As shown in FIG. 1, the structure 100 of the gear 1 includes a gear 1, a weight member 2, and an elastic member 3.

ギヤ１は、周囲のリム部１２と、中央のハブ部１４と、両者を連結する複数（ここでは、５本）のスポーク部１６と、を備えている。 The gear 1 includes a peripheral rim portion 12, a central hub portion 14, and a plurality (here, five) spoke portions 16 that connect the two.

リム部１２は、ハブ部１４よりも大きい円環状に形成され、その外周部分には、複数の歯部１３が形成されている。 The rim portion 12 is formed in an annular shape larger than the hub portion 14, and a plurality of tooth portions 13 are formed on the outer peripheral portion thereof.

ハブ部１４は、円環状に形成され、その中央部分には、軸体（図示略）が圧入される圧入孔１５が形成されている。図２にギヤ１の板厚方向（軸方向ｚと平行な方向）を示すように、ハブ部１４はリム部１２より厚く形成されている。 The hub portion 14 is formed in an annular shape, and a press-fitting hole 15 into which a shaft body (not shown) is press-fitted is formed in the center portion. As shown in FIG. 2 in the thickness direction of the gear 1 (direction parallel to the axial direction z), the hub portion 14 is formed thicker than the rim portion 12.

図１に示すように、スポーク部１６は、ハブ部１４とリム部１２との間の薄板部１７に設けられる。薄板部１７は、図２に示すように、リム部１２より薄く形成されている。スポーク部１６は、ハブ部１４の外周縁からリム部１２の内周縁に向かって放射状に延在しており、リム部１２およびハブ部１４を連結している。周方向ｃで隣接する二個のスポーク部１６の間には、板厚方向に貫通し、周方向ｃに沿って円弧状をなし、所定幅を有する肉盗み穴１８が設けられている。肉盗み穴１８は、具体的には、薄板部１７をくり抜いて設けられる。 As shown in FIG. 1, the spoke portion 16 is provided in the thin plate portion 17 between the hub portion 14 and the rim portion 12. As shown in FIG. 2, the thin plate portion 17 is formed thinner than the rim portion 12. The spoke portion 16 extends radially from the outer peripheral edge of the hub portion 14 toward the inner peripheral edge of the rim portion 12, and connects the rim portion 12 and the hub portion 14. Between the two spoke portions 16 adjacent in the circumferential direction c, there is provided a meat stealing hole 18 that penetrates in the plate thickness direction, forms an arc shape along the circumferential direction c, and has a predetermined width. Specifically, the meat stealing hole 18 is provided by cutting out the thin plate portion 17.

錘部材２は、肉盗み穴１８を設けたことによるギヤ１の慣性モーメントの低下を抑えるように構成されている。図１に示すように、錘部材２は、肉盗み穴１８に遊びがある状態で嵌合するように配置される。 The weight member 2 is configured to suppress a decrease in the moment of inertia of the gear 1 due to the provision of the meat stealing hole 18. As shown in FIG. 1, the weight member 2 is disposed so as to be fitted in a state where there is play in the meat stealing hole 18.

錘部材２は、薄板部１７をくり抜いて肉盗み穴１８が設けられる場合に、くり抜いた肉盗み穴１８の形状をした板の外周を機械加工で一周削ることにより、肉盗み穴１８の形状よりを一回り小さい形状を有している。肉盗み穴１８の周縁とそれより一回り小さな錘部材２の外周縁との間には、全周隙間Ｓが設けられる。 In the case where the weight member 2 is provided with the meat stealing hole 18 by hollowing out the thin plate portion 17, the outer periphery of the plate having the shape of the hollowed meat stealing hole 18 is cut by one round by machining so that the shape of the meat stealing hole 18 Has a slightly smaller shape. A circumferential clearance S is provided between the peripheral edge of the meat stealing hole 18 and the outer peripheral edge of the weight member 2 that is slightly smaller than that.

図３は、図１のＩＩＩ−ＩＩＩ線断面図である。図３に、全周隙間Ｓのうち周方向ｃの両端に位置する隙間（以下、周方向の隙間）Ｓ１を示し、周方向の隙間Ｓ１を介して対向する錘部材２の端縁２２と肉盗み穴１８の端縁１８２とを示す。また、図２に、全周隙間Ｓのうち径方向ｒの両側に位置する隙間（以下、径方向の隙間）Ｓ２を示し、径方向ｒの隙間Ｓ２を介して対向する錘部材２の側縁２４と肉盗み穴１８の側縁１８４とを示す。 3 is a cross-sectional view taken along line III-III in FIG. FIG. 3 shows a gap (hereinafter referred to as a circumferential gap) S1 located at both ends in the circumferential direction c of the entire circumferential gap S, and the edge 22 and the wall of the weight member 2 facing each other through the circumferential gap S1. An end edge 182 of the stealing hole 18 is shown. Also, FIG. 2 shows gaps (hereinafter referred to as radial gaps) S2 located on both sides in the radial direction r of the entire circumferential gap S, and the side edges of the weight member 2 that face each other via the radial gap r2. 24 and the side edge 184 of the meat stealing hole 18 are shown.

弾性部材３は、所定の縦弾性係数を有する。図１および図３にハッチングを付して示すように、弾性部材３は、周方向の隙間Ｓ１に設けられる。弾性部材３としては、例えば、肉盗み穴１８の端縁１８２から錘部材２へ伝播する振動を遮断する防振ゴムが用いられる。 The elastic member 3 has a predetermined longitudinal elastic modulus. As shown in FIG. 1 and FIG. 3 with hatching, the elastic member 3 is provided in the circumferential gap S1. As the elastic member 3, for example, a vibration-proof rubber that blocks vibration propagating from the end edge 182 of the meat stealing hole 18 to the weight member 2 is used.

弾性部材３を周方向の隙間Ｓ１に設けるには公知の技術が用いられる。公知の技術としては、例えば、金型における所定位置にギヤ１を配置し、さらに、ギヤ１の肉盗み穴１８の中に錘部材２を配置し、周方向の隙間Ｓ１に生ゴムに硫黄などを加えて熱する方法（加硫操作）がある。これによって、錘部材２の端縁２２が弾性部材３を介して肉盗み穴１８の端縁１８２に接合される。また、公知の技術として、周方向の隙間Ｓ１を間にして対向する錘部材２の端縁２２または肉盗み穴１８の端縁１８２のいずれか一方に弾性部材３を接着し、その後、錘部材２を肉盗み穴１８に嵌合する方法がある。 A known technique is used to provide the elastic member 3 in the circumferential gap S1. As a known technique, for example, the gear 1 is disposed at a predetermined position in the mold, the weight member 2 is disposed in the meat stealing hole 18 of the gear 1, and sulfur or the like is added to the raw rubber in the circumferential gap S1. In addition, there is a method of heating (vulcanizing operation). As a result, the end edge 22 of the weight member 2 is joined to the end edge 182 of the meat stealing hole 18 via the elastic member 3. Further, as a known technique, the elastic member 3 is bonded to either the end edge 22 of the weight member 2 or the end edge 182 of the meat stealing hole 18 facing each other with the circumferential gap S1 therebetween, and then the weight member There is a method of fitting 2 to the meat stealing hole 18.

なお、本実施の形態では、周方向の隙間Ｓ１以外の隙間、例えば、図２に示す径方向の隙間Ｓ２には、弾性部材３が設けられていない。径方向の隙間Ｓ２は空隙である。したがって、ギヤ１において発生した振動は、肉盗み穴１８の側縁１８４から錘部材２へ伝播しない。 In the present embodiment, the elastic member 3 is not provided in a gap other than the circumferential gap S1, for example, the radial gap S2 shown in FIG. The radial gap S2 is a gap. Therefore, vibration generated in the gear 1 does not propagate from the side edge 184 of the meat stealing hole 18 to the weight member 2.

＜本実施の形態にかかるギヤ１の構造１００の効果＞
以上のように、本実施の形態にかかるギヤ１の構造１００は、ギヤ１の薄板部１７をくり抜いて設けられた肉盗み穴１８に錘部材２を嵌合する。また、肉盗み穴１８と錘部材２との間の全周隙間Ｓにおいて、周方向の隙間Ｓ１に設けられた弾性部材３により、錘部材２を周方向の両側から支持する。これにより、肉盗み穴１８の周縁から錘部材２へ伝播する振動を遮断するため、コンプライアンスを下げながらギヤ１の慣性モーメントを確保することができ、ねじり振動の固有振動数が上がるのを防止し、ねじり共振を発生させる可能性を低減することができる。 <Effect of structure 100 of gear 1 according to the present embodiment>
As described above, in the structure 100 of the gear 1 according to the present embodiment, the weight member 2 is fitted into the meat stealing hole 18 provided by hollowing out the thin plate portion 17 of the gear 1. Further, in the entire circumferential gap S between the meat stealing hole 18 and the weight member 2, the weight member 2 is supported from both sides in the circumferential direction by the elastic member 3 provided in the circumferential gap S1. As a result, the vibration propagating from the peripheral edge of the meat stealing hole 18 to the weight member 2 is cut off, so that the inertia moment of the gear 1 can be secured while lowering the compliance, and the natural frequency of torsional vibration is prevented from increasing. The possibility of generating torsional resonance can be reduced.

また、錘部材２として、薄板部１７をくり抜いて設けられた肉盗み穴１８の形状の板の外周を一回り小さくしたものを用いているので、錘部材２を、例えばギヤ１とは別の材料を用いて、特別に作製する場合に比べて、コストを低減することができる。 Further, as the weight member 2, since the outer periphery of the plate having the shape of the meat stealing hole 18 provided by hollowing out the thin plate portion 17 is used, the weight member 2 is different from the gear 1, for example. Cost can be reduced as compared with the case where the material is used for special production.

＜本実施の形態の変形例＞
なお、上記実施の形態にかかる弾性部材３は、周方向の隙間Ｓ１（図３参照）に設けられているが、隙間Ｓ１以外の隙間、例えば径方向の隙間Ｓ２（図２参照）に設けられていない。 <Modification of the present embodiment>
The elastic member 3 according to the above embodiment is provided in the circumferential gap S1 (see FIG. 3), but is provided in a gap other than the gap S1, for example, in the radial gap S2 (see FIG. 2). Not.

これに対し、変形例にかかる弾性部材３は、全周隙間Ｓに設けられる。この場合において、全周隙間Ｓにおける周方向の隙間Ｓ１以外の隙間に設けられる弾性部材３の縦弾性係数が、周方向の隙間Ｓ１に設けられる弾性部材３の縦弾性係数より低く設定される。 On the other hand, the elastic member 3 according to the modified example is provided in the entire circumferential gap S. In this case, the longitudinal elastic modulus of the elastic member 3 provided in the gap other than the circumferential gap S1 in the entire circumferential gap S is set lower than the longitudinal elastic coefficient of the elastic member 3 provided in the circumferential gap S1.

上述するように、弾性部材３の縦弾性係数は、全周隙間Ｓにおいて一律ではなく、弾性部材３が設けられている位置（ここでは、隙間Ｓ１,Ｓ２の位置）に応じて異なる。このように、位置に応じて縦弾性係数を異ならせるには、加硫操作における硫黄の配合量や加硫操作時間や加硫操作温度などを位置に応じて異ならせる方法が用いられる。なお、隙間Ｓ１以外の隙間に設けられる弾性部材３の縦弾性係数は、理論上「０」であってもよい。 As described above, the longitudinal elastic modulus of the elastic member 3 is not uniform in the entire circumferential gap S, but varies depending on the position where the elastic member 3 is provided (here, the positions of the gaps S1 and S2). Thus, in order to vary the longitudinal elastic modulus depending on the position, a method is used in which the amount of sulfur blended in the vulcanization operation, the vulcanization operation time, the vulcanization operation temperature, or the like is varied depending on the position. The longitudinal elastic modulus of the elastic member 3 provided in the gap other than the gap S1 may theoretically be “0”.

＜変形例にかかるギヤ１の構造１００の効果＞
変形例によれば、ギヤ１に錘部材２を組み付ける場合に、例えば、加硫操作において、全周隙間Ｓに生ゴムと硫黄とを混ぜ合わせたものを流し込み、熱で硬化させればよく、加硫操作時に、弾性部材３を介して錘部材２を肉盗み穴１８の周縁に接合させるため、錘部材２の組付性を向上させることができる。また、加硫操作時に、金型などを用いずに済むため、ギヤ１の構造１００を製造し易くすることができる。 <Effect of structure 100 of gear 1 according to modification>
According to the modified example, when the weight member 2 is assembled to the gear 1, for example, in the vulcanization operation, a mixture of raw rubber and sulfur may be poured into the entire circumferential clearance S and cured by heat. Since the weight member 2 is joined to the periphery of the meat stealing hole 18 via the elastic member 3 during the sulfur operation, the assembling property of the weight member 2 can be improved. Further, since it is not necessary to use a mold during the vulcanization operation, the structure 100 of the gear 1 can be easily manufactured.

なお、上記実施の形態および変形例では、外歯歯車としてのギヤ１の構造１００について説明したが、本発明はこれに限らず、内歯歯車としてのギヤの構造としても適用することができる。 In the above-described embodiment and modification, the structure 100 of the gear 1 as an external gear has been described. However, the present invention is not limited to this and can be applied to the structure of a gear as an internal gear.

また、上記実施の形態及び変形例では、ギヤ１の薄板部１７に肉盗み穴１８を設けたことによるギヤ１の慣性モーメントの低下を抑えるために、肉盗み穴１８に、薄板部１７と同じ厚さを有し、肉盗み穴１８より一回り小さな形状の錘部材２を嵌合させたが、本発明はこれに限らず、例えば、錘部材２は、肉盗み穴１８より二回り以上小さな形状であってもよい。この場合における錘部材２は、慣性モーメントの低下を抑えるために、錘部材２の外形を小さくするに応じて、錘部材２の厚さを薄板部１７より厚くすればよい。 Moreover, in the said embodiment and modification, in order to suppress the fall of the inertia moment of the gear 1 by having provided the meat stealing hole 18 in the thin plate part 17 of the gear 1, it is the same as the thin plate part 17 in the meat stealing hole 18. The weight member 2 having a thickness and having a shape slightly smaller than the meat stealing hole 18 is fitted. However, the present invention is not limited to this, and for example, the weight member 2 is two times smaller than the meat stealing hole 18. It may be a shape. In this case, the weight member 2 may be made thicker than the thin plate portion 17 in accordance with a reduction in the outer shape of the weight member 2 in order to suppress a decrease in moment of inertia.

また、上記実施の形態では、周方向の隙間Ｓ１に設けた弾性部材３により、錘部材２を回転方向（周方向ｃ）の両側から支持するようにしたが、本発明はこれに限らず、肉盗み穴１８の周縁に設けた弾性部材３により、錘部材２を周方向ｃの両側から支持するようにしてもよい。 Moreover, in the said embodiment, although the weight member 2 was supported from the both sides of the rotation direction (circumferential direction c) with the elastic member 3 provided in the clearance gap S1 of the circumferential direction, this invention is not restricted to this, The weight member 2 may be supported from both sides in the circumferential direction c by the elastic member 3 provided at the peripheral edge of the meat stealing hole 18.

なお、上記変形例では、全周隙間Ｓにおける周方向の隙間Ｓ１以外の隙間に設けられる弾性部材３の縦弾性係数が、周方向の隙間Ｓ１に設けられる弾性部材３の縦弾性係数より低くなるように、全周隙間Ｓにおける位置に応じて縦弾性係数を異なせるようにしたが、本発明はこれに限らず、全周隙間Ｓにおける位置に応じて弾性部材３の形状（例えば板厚方向の寸法）を異ならせることで、弾性を異ならせてもよい。 In the modified example, the longitudinal elastic modulus of the elastic member 3 provided in the gap other than the circumferential gap S1 in the entire circumferential gap S is lower than the longitudinal elastic modulus of the elastic member 3 provided in the circumferential gap S1. As described above, the longitudinal elastic modulus is made different according to the position in the entire circumferential gap S. However, the present invention is not limited to this, and the shape of the elastic member 3 (for example, in the thickness direction) depends on the position in the entire circumferential gap S. The elasticity may be made different by making the dimensions of () different.

本開示のギヤ１の構造１００は、コンプライアンスを下げながら、ねじり共振を発生させる可能性を低減することが要求される内燃機関のタイミングギヤなどの動力伝達用のギヤとして有用である。 The structure 1 of the gear 1 of the present disclosure is useful as a power transmission gear such as a timing gear of an internal combustion engine that is required to reduce the possibility of generating torsional resonance while lowering compliance.

１ギヤ
２錘部材
３弾性部材
１２リム部
１３歯部
１４ハブ部
１５圧入孔
１６スポーク部
１８肉盗み穴
１００ギヤの構造 DESCRIPTION OF SYMBOLS 1 Gear 2 Weight member 3 Elastic member 12 Rim part 13 Tooth part 14 Hub part 15 Press-fit hole 16 Spoke part 18 Meat stealing hole 100 Gear structure

Claims

In the structure of the gear that moves in the rotation direction and is provided with a plurality of meat steal holes along the rotation direction,
A weight member fitted into the meat stealing hole;
An elastic member having elasticity, which is provided at a peripheral edge of the meat stealing hole and supports the weight member from both sides in the rotation direction.
Gear structure.

The gear structure according to claim 1, wherein the weight member is configured to suppress a reduction in a moment of inertia of the gear caused by providing the meat stealing hole.

A circumferential clearance is provided between the peripheral edge of the meat stealing hole and the outer peripheral edge of the weight member fitted into the meat stealing hole,
The gear structure according to claim 1, wherein the elastic member is provided in a gap located at least at both ends in the rotation direction of the entire circumferential gap.

The gear structure according to claim 1, wherein the elastic member is an anti-vibration rubber.