JPH0225009Y2 - - Google Patents
Info
- Publication number
- JPH0225009Y2 JPH0225009Y2 JP1985013090U JP1309085U JPH0225009Y2 JP H0225009 Y2 JPH0225009 Y2 JP H0225009Y2 JP 1985013090 U JP1985013090 U JP 1985013090U JP 1309085 U JP1309085 U JP 1309085U JP H0225009 Y2 JPH0225009 Y2 JP H0225009Y2
- Authority
- JP
- Japan
- Prior art keywords
- gear
- grooves
- injection molding
- gate
- central shaft
- 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.)
- Expired
Links
- 238000001746 injection moulding Methods 0.000 claims description 12
- 239000004033 plastic Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案は射出成形されるプラスチツク製の歯車
に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an injection molded plastic gear.
［従来の技術］
従来、射出成形されるプラスチツク製の歯車
は、歯車の円板部の一部に凹部を設け、この凹部
内に射出成形用のゲートを位置させていた。[Prior Art] Conventionally, a plastic gear that is injection molded has a recessed portion formed in a part of the disc portion of the gear, and an injection molding gate is located within this recessed portion.
［解決しようとする課題］
上記従来の構成によると、歯車中で凹部のみが
薄くなつて厚みに差ができるため、射出成形後の
収縮時に凹部近傍にそりを生じる恐れがあつた。
特に、薄型の歯車を成形する場合にはそりが大き
くなつた。このような歯車を用いると、平振れや
偏心が生じ、他の歯車との噛合が円滑に行なわれ
なかつた。[Problems to be Solved] According to the above-mentioned conventional configuration, only the recessed portion in the gear becomes thinner and there is a difference in thickness, so there is a risk that warpage may occur in the vicinity of the recessed portion during shrinkage after injection molding.
In particular, when forming thin gears, the warpage became large. When such a gear is used, flat runout and eccentricity occur, and meshing with other gears cannot be performed smoothly.
そこで本考案の目的は、薄型化してもそりを生
じにくい歯車を提供することにある。 Therefore, an object of the present invention is to provide a gear that is less likely to warp even when made thinner.
［課題を解決するための手段］
本考案に係る歯車は、中心軸とこの中心軸の周
囲に一体的に形成されているピニオンとを有する
円板部と、円板部の外周部に形成されている歯部
とを具備しており、円板部の片面に同心円状の溝
部が複数個形成され、他面にはこの溝部間の間隙
に対応する位置に溝部が形成されており、これら
の溝部のいずれかに射出成形用のゲートが位置さ
れるものである。[Means for Solving the Problems] A gear according to the present invention includes a disc portion having a central axis and a pinion integrally formed around the central axis, and a gear formed on the outer periphery of the disc portion. A plurality of concentric grooves are formed on one side of the disk part, and grooves are formed on the other side at positions corresponding to the gaps between the grooves. A gate for injection molding is located in one of the grooves.
［作用］
本考案に係る歯車は、上下両面に溝部が交互に
形成されているため、円板部全域にわたつて歯車
の厚みはほぼ一定に保たれる。従つて、射出成形
後の収縮時にも、そりを生じにくい。[Function] Since the gear according to the present invention has grooves alternately formed on both the upper and lower surfaces, the thickness of the gear is kept almost constant over the entire disk portion. Therefore, warping is less likely to occur during shrinkage after injection molding.
［実施例］ 本考案の実施例を図面を参照して説明する。[Example] Embodiments of the present invention will be described with reference to the drawings.
第１，２図に本考案の第１の実施例を示してい
る。歯車１はプラスチツクの射出成形により形成
されている。歯車１の円板部３の中央には中心軸
２が形成されており、この中心軸の周囲にはピニ
オン２ａが一体的に形成されている。円板部３の
外周には歯部３ａが設けられている。 1 and 2 show a first embodiment of the present invention. The gear 1 is formed by injection molding of plastic. A central shaft 2 is formed at the center of the disc portion 3 of the gear 1, and a pinion 2a is integrally formed around this central shaft. A toothed portion 3a is provided on the outer periphery of the disc portion 3.
円板部３の上面には、中心軸２を中心とする同
心円状の溝部４，５が所定の間隔をおいてそれぞ
れ設けられている。そして下面においては、溝部
４，５間の間隙に対応する位置に溝部６が設けら
れており、外周部には切欠部７が形成されてい
る。溝部４，５，６は断面形状が略台形状になつ
ている。溝部６の一部には、射出成形用のゲート
の跡８が突出している。この歯車１を製造する際
には、金型内において、射出成形用のゲート（図
示せず。）を溝部６にあたる位置に設置し、この
ゲートからプラスチツク材料を射出する。歯車１
は、射出成形後にゲート部分でランナ（図示せ
ず。）から切断されるが、その際に切り残した部
分が、第１，２図に示す跡８である。 Concentric grooves 4 and 5 centered on the central axis 2 are provided on the upper surface of the disc portion 3 at predetermined intervals. On the lower surface, a groove 6 is provided at a position corresponding to the gap between the grooves 4 and 5, and a notch 7 is formed on the outer periphery. The groove portions 4, 5, and 6 have a substantially trapezoidal cross-sectional shape. A gate mark 8 for injection molding protrudes from a part of the groove 6. When manufacturing this gear 1, an injection molding gate (not shown) is installed in a mold at a position corresponding to the groove 6, and plastic material is injected from this gate. gear 1
is cut from the runner (not shown) at the gate after injection molding, and the portion left uncut at that time is the mark 8 shown in FIGS. 1 and 2.
次に、第３図を参照して第２の実施例について
説明する。 Next, a second embodiment will be described with reference to FIG.
歯車１１の円板部１３の中央には、中心孔を有
する中心軸１２が形成されており、中心軸１２の
周囲にはピニオン１２ａが形成されている。円板
部１３の外周には歯部１３ａが設けられている。 A central shaft 12 having a central hole is formed in the center of the disk portion 13 of the gear 11, and a pinion 12a is formed around the central shaft 12. A toothed portion 13a is provided on the outer periphery of the disc portion 13.
円板部１３の上面には、中心軸１２を中心とす
る同心円状の溝部１４，１５が所定の間隔をおい
てそれぞれ設けられている。そして下面において
は、溝部１４，１５の間隙に対応する位置に溝部
１６が設けられており、外周部には切欠部１７が
形成されている。溝部１４，１５，１６は断面形
状が略半円状になつている。溝部１６の一部に
は、射出成形用のゲートの跡１８が突出してい
る。これは第１の実施例と同様に、ランナ（図示
せず。）から歯車１１を切断する際に切り残した
部分である。 Concentric grooves 14 and 15 centered on the central axis 12 are provided on the upper surface of the disc portion 13 at predetermined intervals. On the lower surface, a groove 16 is provided at a position corresponding to the gap between the grooves 14 and 15, and a notch 17 is formed on the outer periphery. The groove portions 14, 15, and 16 have a substantially semicircular cross-sectional shape. An injection molding gate mark 18 protrudes from a part of the groove 16. Similar to the first embodiment, this is the portion left uncut when cutting the gear 11 from the runner (not shown).
これら第１，２の実施例によると、円板部３，
１３は全域にわたつて概ね一定の厚さに形成する
ことができ、射出成形後の収縮時にもそりを生じ
る恐れがない。 According to these first and second embodiments, the disk portion 3,
13 can be formed to have a substantially constant thickness over the entire area, and there is no risk of warping even when shrinking after injection molding.
また、ゲート跡８，１８は溝部６，１６内に位
置するため、歯車の外形には影響を及ぼさない。 Furthermore, since the gate marks 8 and 18 are located within the grooves 6 and 16, they do not affect the outer shape of the gear.
［効果］
本考案に係る歯車によると、射出成形後の収縮
などによつて、円板部にそりを生じる恐れがな
い。したがつて平振れ、偏心などが生じず、他の
歯車との円滑な噛合が行なえる。また、そりを生
じさせることなく薄形化でき、材料の節約、軽量
化が可能で、慣性モーメントを小さくできる。[Effects] According to the gear according to the present invention, there is no risk of warpage occurring in the disc portion due to shrinkage after injection molding. Therefore, flat runout, eccentricity, etc. do not occur, and smooth meshing with other gears can be performed. In addition, it can be made thinner without causing warpage, material can be saved, the weight can be reduced, and the moment of inertia can be reduced.
第１図は本考案の第１の実施例の断面図、第２
図はその底面図、第３図は第２の実施例の断面図
である。
１，１１……歯車、２，１２……中心軸、３，
１３……円板部、３ａ，１３ａ……歯部、４，
５，６，１４，１５，１６……溝部、８，１８…
…ゲート跡。
Fig. 1 is a sectional view of the first embodiment of the present invention;
The figure is a bottom view, and FIG. 3 is a sectional view of the second embodiment. 1, 11... Gear, 2, 12... Central shaft, 3,
13...disc part, 3a, 13a...teeth part, 4,
5, 6, 14, 15, 16...Groove, 8, 18...
... Gate remains.
Claims (1)
ているピニオンとを有する円板部と、上記円板部
の外周部に形成されている歯部とを具備してお
り、 上記円板部の片面に同心円状の溝部が複数個形
成され、他面には上記溝部間の間隙に対応する位
置に溝部が形成されており、 上記溝部のいずれかに射出成形用のゲートが位
置される ことを特徴とする歯車。[Claims for Utility Model Registration] A disc part having a central shaft and a pinion integrally formed around the central shaft, and a tooth part formed on the outer periphery of the disc part. A plurality of concentric grooves are formed on one side of the disc part, and grooves are formed on the other side at positions corresponding to the gaps between the grooves, and injection molding is performed on any of the grooves. A gear characterized in that a gate for use is located.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985013090U JPH0225009Y2 (en) | 1985-02-01 | 1985-02-01 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985013090U JPH0225009Y2 (en) | 1985-02-01 | 1985-02-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61129957U JPS61129957U (en) | 1986-08-14 |
| JPH0225009Y2 true JPH0225009Y2 (en) | 1990-07-10 |
Family
ID=30496771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985013090U Expired JPH0225009Y2 (en) | 1985-02-01 | 1985-02-01 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0225009Y2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8906128B2 (en) | 2004-08-06 | 2014-12-09 | Donaldson Company, Inc. | Air filter arrangement; assembly; and, methods |
| US9084957B2 (en) | 2008-07-25 | 2015-07-21 | Donaldson Company, Inc. | Pleated filtration media, media packs, filter elements, and methods for filtering fluids |
| US9108394B2 (en) | 2008-08-06 | 2015-08-18 | Donaldson Company, Inc. | Method of making a Z-media having flute closures |
| US9120047B2 (en) | 2004-06-14 | 2015-09-01 | Donaldson Company, Inc. | Air filter arrangement; assembly; and, methods |
| US9180399B2 (en) | 2005-01-13 | 2015-11-10 | Donaldson Company, Inc. | Air filter arrangement |
| US9320997B2 (en) | 2013-06-28 | 2016-04-26 | Donaldson Company, Inc. | Air filter cartridges; air cleaner assemblies; housings; features; components; and, methods |
| US9433884B2 (en) | 2007-06-26 | 2016-09-06 | Donaldson Company, Inc. | Filtration media pack, filter element, and methods |
| US9517430B2 (en) | 2007-02-02 | 2016-12-13 | Donaldson Company, Inc. | Air filtration media pack, filter element, air filtration media, and methods |
| US9527023B2 (en) | 2005-01-13 | 2016-12-27 | Donaldson Comapny, Inc. | Air filter arrangement; assembly; and, methods |
| US9555370B2 (en) | 2007-09-07 | 2017-01-31 | Donaldson Company, Inc. | Air filter assembly; components thereof; and, methods |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6016357B2 (en) * | 2011-12-21 | 2016-10-26 | キヤノン株式会社 | Gear and image forming apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6145403Y2 (en) * | 1981-04-02 | 1986-12-20 |
-
1985
- 1985-02-01 JP JP1985013090U patent/JPH0225009Y2/ja not_active Expired
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9120047B2 (en) | 2004-06-14 | 2015-09-01 | Donaldson Company, Inc. | Air filter arrangement; assembly; and, methods |
| US8906128B2 (en) | 2004-08-06 | 2014-12-09 | Donaldson Company, Inc. | Air filter arrangement; assembly; and, methods |
| US9180399B2 (en) | 2005-01-13 | 2015-11-10 | Donaldson Company, Inc. | Air filter arrangement |
| US9527023B2 (en) | 2005-01-13 | 2016-12-27 | Donaldson Comapny, Inc. | Air filter arrangement; assembly; and, methods |
| US9517430B2 (en) | 2007-02-02 | 2016-12-13 | Donaldson Company, Inc. | Air filtration media pack, filter element, air filtration media, and methods |
| US9433884B2 (en) | 2007-06-26 | 2016-09-06 | Donaldson Company, Inc. | Filtration media pack, filter element, and methods |
| US9555370B2 (en) | 2007-09-07 | 2017-01-31 | Donaldson Company, Inc. | Air filter assembly; components thereof; and, methods |
| US9084957B2 (en) | 2008-07-25 | 2015-07-21 | Donaldson Company, Inc. | Pleated filtration media, media packs, filter elements, and methods for filtering fluids |
| US9108394B2 (en) | 2008-08-06 | 2015-08-18 | Donaldson Company, Inc. | Method of making a Z-media having flute closures |
| US9320997B2 (en) | 2013-06-28 | 2016-04-26 | Donaldson Company, Inc. | Air filter cartridges; air cleaner assemblies; housings; features; components; and, methods |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61129957U (en) | 1986-08-14 |
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