JPH0662255U - Gear device - Google Patents
Gear deviceInfo
- Publication number
- JPH0662255U JPH0662255U JP899893U JP899893U JPH0662255U JP H0662255 U JPH0662255 U JP H0662255U JP 899893 U JP899893 U JP 899893U JP 899893 U JP899893 U JP 899893U JP H0662255 U JPH0662255 U JP H0662255U
- Authority
- JP
- Japan
- Prior art keywords
- gear
- tooth
- resin
- metal
- gears
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Gear Transmission (AREA)
- Gears, Cams (AREA)
Abstract
(57)【要約】
【目的】 樹脂製ギヤの耐久性を損なわすことなく、ひ
けによる歯端部の凸部およびバリに起因する噛み合い不
良を回避し、金属製ギヤとの安定した噛み合いを実現す
る歯車装置を提供する。
【構成】 金属製ギヤ3は樹脂製ギヤ2と歯幅がほぼ等
しく、歯の両端部3a・3aは、歯先円径3sに対し約
45゜の傾斜角度で面取りされている。そして、樹脂製
ギヤ2の歯端の凸部およびバリの影響を受けにくい箇所
に、金属製ギヤ3の歯端部(面取部)3aを噛合させ、
両ギヤ2・3の歯端部付近でバックラッシを適正値に設
定している。
(57) [Summary] [Purpose] Achieving stable meshing with metal gears, without compromising the durability of resin gears and avoiding poor meshing due to protrusions and burrs on tooth edges due to sink marks. To provide a gear device that does. [Structure] The metal gear 3 has substantially the same tooth width as the resin gear 2, and both ends 3a, 3a of the teeth are chamfered at an inclination angle of about 45 ° with respect to the tip circle diameter 3s. Then, the tooth end portion (chamfered portion) 3a of the metal gear 3 is meshed with a convex portion of the tooth end of the resin gear 2 and a portion which is unlikely to be affected by burrs.
The backlash is set to an appropriate value near the tooth ends of both gears 2 and 3.
Description
【0001】[0001]
この考案は、主としてエンジンに使用される歯車装置に関し、詳しくは金属製 ギヤと樹脂製ギヤとからなる歯車装置に関するものである。 The present invention mainly relates to a gear device used in an engine, and more particularly to a gear device including a metal gear and a resin gear.
【0002】[0002]
近年、エンジンにおけるギヤ音の低減、コストダウンおよび軽量化などの観点 から、ギヤの樹脂化が普及している。こうした樹脂製ギヤは、一般的にナイロン 樹脂などの熱可塑性樹脂により一体成形で製造されている。 In recent years, resin gears have become widespread from the viewpoints of reducing gear noise in engines, reducing costs, and reducing weight. Such resin gears are generally integrally molded from a thermoplastic resin such as nylon resin.
【0003】 上記した樹脂製ギヤは、一方の歯面を歯幅方向に沿って見た歯すじ形状を歯厚 方向に拡大した図3に示すように、成形後の収縮ひけにより、理想的な歯すじ形 状21dに対して歯の中央部分21aが凹状にややへこむとともに歯端付近21 bが凸状にやや膨らむ傾向がある。さらに、金型合わせ部においてギヤ21の歯 端縁に沿って、成形圧力によるバリ21cが発生し易い。The resin gear described above is ideal because of shrinkage shrinkage after molding, as shown in FIG. 3 in which the tooth line shape of one tooth surface viewed along the tooth width direction is enlarged in the tooth thickness direction. There is a tendency that the central portion 21a of the tooth slightly dents with respect to the tooth-like shape 21d, and the vicinity 21b of the tooth slightly bulges convexly. Furthermore, burrs 21c due to the molding pressure easily occur along the tooth edges of the gear 21 at the die matching portion.
【0004】 そこで、樹脂製ギヤ21の歯端付近における凸部やバリの影響を少なくするす るため、図5(a)のように金属製ギヤ31の歯幅を樹脂製ギヤ21のそれよりも 狭くすると、噛み合い幅が小さくなるために面圧が上昇し、図5(b)のように樹 脂製ギヤ21の歯面が段状に摩耗してこの段付き摩耗箇所22が徐々に進行する ので、耐久性に問題がある。そのため、樹脂製ギヤを金属製ギヤと組み合わせる 場合には、従来は、図4のように、金属製ギヤ31の歯幅を樹脂製ギヤ21のそ れよりもやや広くしている。Therefore, in order to reduce the influence of protrusions and burrs near the tooth ends of the resin gear 21, the tooth width of the metal gear 31 is set to be smaller than that of the resin gear 21 as shown in FIG. If it is also narrowed, the meshing width becomes smaller and the surface pressure rises. As shown in Fig. 5 (b), the tooth surface of the resin gear 21 wears stepwise, and this stepped wear point 22 gradually progresses. Therefore, there is a problem in durability. Therefore, when a resin gear is combined with a metal gear, conventionally, the tooth width of the metal gear 31 is made slightly wider than that of the resin gear 21, as shown in FIG.
【0005】 なお、その他の先行技術として、特公昭59−41056号公報に記載のもの がある。As another prior art, there is one disclosed in Japanese Patent Publication No. 59-41056.
【0006】[0006]
【考案が解決しようとする課題】 しかしながら、樹脂製ギヤを歯幅をやや広くした金属製ギヤと組み合わせて歯 車装置を構成する場合(図4)に、以下のような不都合がある。However, when the gear made of resin is combined with the gear made of metal having a slightly wider tooth width to configure the gear device (FIG. 4), there are the following inconveniences.
【0007】 1)樹脂製ギヤの歯幅中央部分にて金属製ギヤとのバックラッシを適正値に設 定すると、歯端部ではひけによる凸部とバリによりバックラッシがゼロ以下(マ イナス)になるため、特に運転初期にヒューヒューというセリ音が発生する。1) If the backlash with the metal gear is set to an appropriate value at the center of the tooth width of the resin gear, the backlash will be less than zero (minus) at the tooth end due to the protrusions and burrs due to sink marks. Therefore, a humming noise is generated especially at the beginning of driving.
【0008】 2)上記1)のセリ音の発生を避けるため、歯端部でバックラッシを適正値に 設定すると、摺合わせ運転後にバリが除去されてバックラッシが増大するため、 トルク変動によりガタガタというガラ音が発生する。2) If the backlash is set to an appropriate value at the tooth end in order to avoid the generation of the rattling noise in the above 1), the burr is removed after the sliding operation and the backlash increases, which causes rattling due to torque fluctuation. Sound is generated.
【0009】 3)成形後に樹脂製ギヤのバリ取りのため、バフがけなどの仕上げ加工を行う と、加工工程が増えてコストアップとなる。3) If deburring of the resin gear is performed after molding, if finishing processing such as buffing is performed, the number of processing steps increases and the cost increases.
【0010】 4)樹脂製ギヤの成形条件・後処理条件により、ひけによる歯端部の凸量およ びバリ高さのばらつきが大きいため、金属製ギヤとの噛み合いが不安定である。4) Depending on the molding conditions and post-treatment conditions of the resin gear, the amount of protrusion of the tooth end portion and the burr height vary greatly due to sink marks, so that meshing with the metal gear is unstable.
【0011】 この考案は上述の点に鑑みなされたもので、樹脂製ギヤの耐久性を損なわすこ となく、ひけによる歯端部の凸部およびバリに起因する噛み合い不良を回避し、 金属製ギヤとの安定した噛み合いを実現する歯車装置を提供することを目的とし ている。The present invention has been made in view of the above-mentioned points, and avoids a poor meshing due to a protrusion and a burr of a tooth end portion due to a sink, without impairing the durability of a resin gear, It is an object of the present invention to provide a gear device that realizes stable meshing with the gear device.
【0012】[0012]
上記した目的を達成するために本考案の歯車装置は、a)歯幅が歯元部分でほぼ 等しく相互に噛合する金属製ギヤと樹脂製ギヤとを備えた歯車装置であって、b) 前記金属製ギヤの歯幅方向の少なくとも一方の端部を、歯先から歯元付近にかけ て面取りしている。 In order to achieve the above-mentioned object, a gear device of the present invention comprises: a) a gear device including a metal gear and a resin gear, the tooth widths of which are substantially equal to each other at a tooth root portion, and b), At least one end in the tooth width direction of the metal gear is chamfered from the tooth tip to the vicinity of the tooth root.
【0013】[0013]
【作用】 上記の構成を有する本考案の歯車装置によれば、金属製ギヤの歯端部が歯元付 近まで面取りされているため、樹脂製ギヤに対する金属製ギヤの歯端部との噛み 合いを、樹脂製ギヤの歯端部の凸部やバリの影響を受けにくい箇所に設定するこ とができ、これによりバックラッシのばらつきが少なくなる。According to the gear device of the present invention having the above-described structure, since the tooth end of the metal gear is chamfered to the vicinity of the root of the tooth, the gear end meshes with the tooth end of the metal gear with respect to the resin gear. The gap can be set at a position where the resin gear teeth are not easily affected by the protrusions of the tooth ends or burrs, which reduces the backlash variation.
【0014】 また、金属製ギヤの歯幅を樹脂製ギヤのそれよりも狭くした場合(図5(a)参 照)に比べて、図2(b)の斜線部分の噛み合い幅が増加するため、樹脂製ギヤに 作用する面圧を低下させることができ、耐久性の向上が図られる。Further, as compared with the case where the tooth width of the metal gear is narrower than that of the resin gear (see FIG. 5 (a)), the meshing width of the hatched portion in FIG. 2 (b) increases. Therefore, the surface pressure acting on the resin gear can be reduced, and the durability can be improved.
【0015】 さらに、樹脂製ギヤは成形後の収縮ひけにより、インボリュート歯形形状に比 べて歯先側の歯厚が薄くなって逃げる傾向があるため、歯元側の面圧が上昇する 傾向にあるが、本考案では金属製ギヤの歯端部を面取りによって傾斜させている から、図2(c)に示すように、歯端部における樹脂製ギヤとの噛み合いは、A点 からB点へと変位していくので、インボリュート歯形形状に沿った理想の噛み合 わせに近付き、樹脂製ギヤの歯元側の面圧上昇が緩和される。[0015] Furthermore, since the resin gear tends to escape due to the shrinkage shrinkage after molding, the tooth thickness on the tip side becomes thinner than the tooth profile on the involute tooth profile, and the surface pressure on the root side tends to increase. However, in the present invention, since the tooth end of the metal gear is inclined by chamfering, as shown in FIG. 2 (c), the meshing with the resin gear at the tooth end is from point A to point B. Therefore, the ideal meshing along the shape of the involute tooth profile is approached, and the surface pressure increase on the root side of the resin gear is alleviated.
【0016】[0016]
以下、本考案の歯車装置の実施例を図面に基づいて説明する。 An embodiment of a gear device of the present invention will be described below with reference to the drawings.
【0017】 図1は本実施例にかかる歯車装置の一部を示す斜視図で、同図において、本実 施例の歯車装置1は、ナイロン66樹脂などの熱可塑性樹脂により一体形成され たはすば歯車からなる樹脂製ギヤ2に対し、はすば歯車からなる金属製ギヤ3を 噛合させた、2つのギヤ2・3により構成されている。なお各ギヤ2・3は、は すば歯車でなく、たとえば平歯車であってもよい。FIG. 1 is a perspective view showing a part of the gear device according to the present embodiment. In FIG. 1, the gear device 1 according to the present embodiment is integrally formed of a thermoplastic resin such as nylon 66 resin. It is composed of two gears 2, 3 in which a metal gear 3 made of a helical gear is meshed with a resin gear 2 made of a helical gear. The gears 2 and 3 may be spur gears instead of helical gears.
【0018】 金属製ギヤ3は、図2(a)に示すように樹脂製ギヤ2と歯幅が歯元部分でほぼ 等しく(正確には、金属製ギヤ3の方がやや広い)、歯の両端部3a・3aを、 歯先円径3sに対して約45゜の傾斜角度で面取りしている。図2(a)中の符号 4は樹脂製ギヤ2により駆動される回転軸のフランジで、これと補強部材4bで 樹脂製ギヤ2のリム部2bが挟持され、止具4aで一体に結合されている。As shown in FIG. 2A, the metal gear 3 has substantially the same tooth width as that of the resin gear 2 in the tooth root portion (to be precise, the metal gear 3 is slightly wider). Both ends 3a, 3a are chamfered at an inclination angle of about 45 ° with respect to the tip circle diameter 3s. Reference numeral 4 in FIG. 2 (a) is a flange of the rotary shaft driven by the resin gear 2, and the rim portion 2b of the resin gear 2 is sandwiched by this and the reinforcing member 4b, and integrally joined by the stopper 4a. ing.
【0019】 金属製ギヤ3の歯端部3aの面取線(歯元付近)が、樹脂製ギヤ2の歯先の端 部よりわずか内側寄りを通るように、各ギヤ2・3を相互に噛合させて組み合わ せている。つまり、樹脂製ギヤ2の歯端の凸部およびバリの影響を受けにくい箇 所に、金属製ギヤ3の歯端部(面取部)3aを噛合させている。そして、両ギヤ 2・3の歯端部付近で、バックラッシを適正値に設定してる。The gears 2 and 3 are mutually connected so that the chamfered line (near the root) of the tooth end 3a of the metal gear 3 passes slightly inward from the end of the tooth tip of the resin gear 2. It is engaged and combined. That is, the tooth end portion (chamfered portion) 3 a of the metal gear 3 is meshed with the convex portion of the tooth end of the resin gear 2 and the portion that is less likely to be affected by the burr. The backlash is set to an appropriate value near the tooth ends of both gears 2 and 3.
【0020】 図2(b)は両ギヤ2・3の噛合部分の一端部を示すもので、図2(c)は図2( b)の樹脂製ギヤ2のX−X線断面とY−Y線断面とにおける金属製ギヤ3の噛 み合い状態を表している。図2(c)に示すように、金属製ギヤ3との噛み合い は、相対的に樹脂製ギヤ2のA点からB点へと進行するので、インボリュート歯 形同士の噛み合い状態に近くなる。したがって、樹脂製ギヤ2の歯元側の面圧上 昇が緩和され、金属製ギヤ3との円滑かつ安定した噛み合いが得られる。FIG. 2B shows one end of the meshing portion of both gears 2 and 3, and FIG. 2C shows a cross section taken along line X-X and Y- of the resin gear 2 of FIG. 2B. The meshed state of the metal gear 3 in the Y-line cross section is shown. As shown in FIG. 2C, the meshing with the metal gear 3 relatively progresses from the point A to the point B of the resin gear 2, so that the meshing state becomes close to the meshing state of the involute tooth profiles. Therefore, the increase in the surface pressure on the tooth root side of the resin gear 2 is alleviated, and smooth and stable meshing with the metal gear 3 is obtained.
【0021】 上記実施例では、歯車装置1の使用箇所を具体的に示していないが、たとえば エンジンのクランクシャフトギヤに金属製ギヤ3が用いられ、このクランクシャ フトギヤと噛合されるカムシャフトギヤに樹脂製ギヤ2が用いられる。とくに限 定するものではないが、通常は金属製ギヤ3が駆動側のギヤに用いられ、従動側 のギヤに樹脂製ギヤ2が用いられる。また、樹脂製ギヤ2は、エンジンでは、バ ランスシャフトギヤやガバナギヤなどに使用されることが多い。In the above-mentioned embodiment, although the use location of the gear device 1 is not specifically shown, for example, a metal gear 3 is used for a crankshaft gear of an engine, and a camshaft gear meshed with the crankshaft gear is used. The resin gear 2 is used. Although not particularly limited, a metal gear 3 is usually used as a drive-side gear, and a resin gear 2 is used as a driven-side gear. Further, the resin gear 2 is often used as a balance shaft gear or a governor gear in an engine.
【0022】 ところで、上記実施例では、金属製ギヤ3の歯の両端部を面取りする場合を示 したが、効果はやや低下するが歯の一方の端部を面取りしても有効である。By the way, in the above embodiment, the case where both ends of the teeth of the metal gear 3 are chamfered has been shown, but the effect is slightly reduced, but chamfering one end of the teeth is also effective.
【0023】 また、金属製ギヤ3の端部を面取りする際には、歯先より歯元付近まで面取り する必要があるが、その面取りの角度は、樹脂製ギヤ2の歯端部のひけやバリな どの発生状況に応じて適宜設定される。Further, when chamfering the end portion of the metal gear 3, it is necessary to chamfer from the tip of the tooth to the vicinity of the root, but the chamfering angle is the sink mark of the tooth end of the resin gear 2. It is set appropriately according to the occurrence situation such as Bali.
【0024】 さらに、金属製ギヤ3に対し複数の樹脂製ギヤ2を同時に噛み合わせた歯車装 置とすることもできる。Further, a gear device in which a plurality of resin gears 2 are simultaneously meshed with the metal gear 3 may be used.
【0025】[0025]
以上説明したことから明らかなように、本考案の歯車装置には、次のような効 果がある。 As is apparent from the above description, the gear device of the present invention has the following effects.
【0026】 (1) 樹脂製ギヤの成形後の収縮ひけによる歯端部の凸部およびバリに起因する 噛み合い不良が回避され、金属製ギヤとの円滑かつ安定した噛み合いが達成され る。(1) A defective meshing due to a convex portion of the tooth end portion and a burr due to shrinkage shrinkage after molding the resin gear is avoided, and smooth and stable meshing with the metal gear is achieved.
【0027】 (2) 金属製ギヤの端部を面取りするだけの簡単な加工を施すだけで済むから、 樹脂製ギヤにバリ取り等の仕上げ加工を施すのに比べ製造コストが安く、経済的 である。(2) Since only a simple process of chamfering the end of the metal gear is required, the manufacturing cost is cheaper and economical compared to the case where the resin gear is subjected to finishing such as deburring. is there.
【0028】 (3) 金属製ギヤの端部を面取りしたことによる、樹脂製ギヤに対する噛み合い 幅の減少は小さいので、耐久性にはほとんど影響がない。(3) Since the reduction of the meshing width with the resin gear due to the chamfering of the end of the metal gear is small, the durability is hardly affected.
【図1】本考案の歯車装置の実施例を示す一部を省略し
た斜視図である。FIG. 1 is a partially omitted perspective view showing an embodiment of a gear device of the present invention.
【図2】図2(a)は図1の歯車装置の一部を拡大して示
す断面図、図2(b)は図1の2つのギヤの噛合部分の一
端部をさらに拡大して示す断面図、図2(c)は図2(b)
の樹脂製ギヤのX−X線断面とY−Y線断面とにおける
金属製ギヤの噛み合い状態の進行過程を拡大して表す、
図2(b)のZ方向矢視図である。2 (a) is an enlarged sectional view showing a part of the gear device of FIG. 1, and FIG. 2 (b) is an enlarged view of one end portion of the meshing portion of the two gears of FIG. Sectional view, Figure 2 (c) is Figure 2 (b)
The enlarged process of the meshing state of the metal gear in the XX line cross section and the YY line cross section of the resin gear of FIG.
It is a Z direction arrow line view of FIG.2 (b).
【図3】樹脂製ギヤの一方の歯面を歯幅方向に沿って見
た歯すじ形状を、歯幅方向に対し歯厚方向に100倍程
度拡大して示す平面図である。FIG. 3 is a plan view showing a tooth line shape in which one tooth surface of a resin gear is viewed along a tooth width direction and is enlarged about 100 times in the tooth thickness direction with respect to the tooth width direction.
【図4】歯幅をやや広くした金属製ギヤと樹脂製ギヤと
の噛み合わせ部分を拡大して示す断面図である。FIG. 4 is an enlarged cross-sectional view showing a meshing portion of a metal gear and a resin gear having a slightly wide tooth width.
【図5】図5(a)は歯幅を狭くした金属製ギヤと樹脂製
ギヤとの噛み合わせ部分を拡大して示す断面図、図5
(b)は樹脂製ギヤの歯面に生じた段付き摩耗部分および
それを拡大して示す断面図である。5 (a) is an enlarged sectional view showing a meshing portion of a metal gear and a resin gear having a narrow tooth width, FIG.
(b) is a sectional view showing a stepped wear portion generated on the tooth surface of the resin gear and an enlarged view thereof.
1 歯車装置 2 樹脂製ギヤ 3 金属製ギヤ 3a 歯端部(面取部) 1 Gear Device 2 Resin Gear 3 Metal Gear 3a Tooth End (Chamfer)
Claims (1)
する金属製ギヤと樹脂製ギヤとを備えた歯車装置であっ
て、 前記金属製ギヤの歯幅方向の少なくとも一方の端部を、
歯先から歯元付近にかけて面取りしたことを特徴とする
歯車装置。1. A gear device comprising a metal gear and a resin gear having tooth widths that are substantially equal to each other in a tooth root portion and mesh with each other, wherein at least one end portion of the metal gear in a tooth width direction is provided. ,
A gear device characterized by chamfering from the tip to the vicinity of the root.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1993008998U JP2526927Y2 (en) | 1993-02-08 | 1993-02-08 | Gear device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1993008998U JP2526927Y2 (en) | 1993-02-08 | 1993-02-08 | Gear device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0662255U true JPH0662255U (en) | 1994-09-02 |
JP2526927Y2 JP2526927Y2 (en) | 1997-02-26 |
Family
ID=11708362
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1993008998U Expired - Lifetime JP2526927Y2 (en) | 1993-02-08 | 1993-02-08 | Gear device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2526927Y2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003023255A1 (en) * | 2001-09-06 | 2003-03-20 | Daihatsu Motor Co., Ltd. | Continuously variable transmission |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0262704A (en) * | 1988-08-29 | 1990-03-02 | Nec Kansai Ltd | Method for grinding curved face of core block |
-
1993
- 1993-02-08 JP JP1993008998U patent/JP2526927Y2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0262704A (en) * | 1988-08-29 | 1990-03-02 | Nec Kansai Ltd | Method for grinding curved face of core block |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003023255A1 (en) * | 2001-09-06 | 2003-03-20 | Daihatsu Motor Co., Ltd. | Continuously variable transmission |
CN100394072C (en) * | 2001-09-06 | 2008-06-11 | 大发工业株式会社 | Continuously variable transmission |
Also Published As
Publication number | Publication date |
---|---|
JP2526927Y2 (en) | 1997-02-26 |
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