JPS6319751B2 - - Google Patents
Info
- Publication number
- JPS6319751B2 JPS6319751B2 JP21967782A JP21967782A JPS6319751B2 JP S6319751 B2 JPS6319751 B2 JP S6319751B2 JP 21967782 A JP21967782 A JP 21967782A JP 21967782 A JP21967782 A JP 21967782A JP S6319751 B2 JPS6319751 B2 JP S6319751B2
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- resin
- sleeve
- gap
- gear
- 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
- 239000011347 resin Substances 0.000 claims description 21
- 229920005989 resin Polymers 0.000 claims description 21
- 238000000465 moulding Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
Landscapes
- Gears, Cams (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は、車両用トランスミツシヨンのスピー
ドメータドライブギアに噛み合つて速度を検出す
るためのスピードメータ用ワイヤを回転する軸付
樹脂製歯車に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin gear with a shaft that meshes with a speedometer drive gear of a vehicle transmission and rotates a speedometer wire for detecting speed.
従来、スピードメータ用の被駆動歯車機構とし
ては、例えば第１図に示すようなものがある。 Conventionally, as a driven gear mechanism for a speedometer, there is one shown in FIG. 1, for example.
第１図において、１は軸付樹脂製歯車であり、
スリーブ２の軸穴をもつて摺動回転される樹脂製
の軸部３を一体に形成しており、軸部３のワイヤ
連結側にはオイルシール４が組み付けられてい
る。 In FIG. 1, 1 is a resin gear with a shaft,
A shaft portion 3 made of resin that slides and rotates through the shaft hole of the sleeve 2 is integrally formed, and an oil seal 4 is assembled on the wire connection side of the shaft portion 3.
ところで、軸付樹脂製歯車１の軸部３は第２図
に示す割り金型５，５′を用いて樹脂成形される
ものであるが、割り金型５，５′を繰り返し使用
していると金型の合せ目が摩耗して隙間６を生
じ、第３図に示すように軸部３の金型合せ部分に
バリ７を発生するようになる。このように軸部３
にバリ７が発生すると、第１図に示すようにスリ
ーブ２の軸穴で摺動回転するときにバリ７が剥れ
て軸穴との間に目づまりを生じ、軸部３の焼付け
を起す恐れがあつた。 Incidentally, the shaft portion 3 of the shafted resin gear 1 is resin-molded using the split molds 5 and 5' shown in FIG. 2, and the split molds 5 and 5' are repeatedly used. The joint between the mold and the mold wears, creating a gap 6, and as shown in FIG. 3, a burr 7 is generated at the mold joint of the shaft portion 3. In this way, the shaft part 3
If burrs 7 are generated in the sleeve 2, as shown in Fig. 1, the burrs 7 will peel off when the sleeve 2 slides and rotates in the shaft hole, causing a blockage between the sleeve 2 and the shaft hole, which may cause seizing of the shaft portion 3. It was hot.
そこで、軸部３とスリーブ軸穴の隙間を大きく
して目づまりを防ぐことも考えられるが、スリー
ブ２がガタ付いて歯車の噛み合い誤差が大きくな
るという不都合が生ずる。 Therefore, it is conceivable to prevent the clogging by increasing the gap between the shaft portion 3 and the sleeve shaft hole, but this results in the inconvenience that the sleeve 2 becomes loose and the meshing error of the gears increases.
本発明は、このような従来の問題点に鑑みて成
されたもので、樹脂成形により軸部にバリを生じ
てもスリーブ軸穴での摺動回転において目づまり
を生じないようにした軸付樹脂製歯車を提供する
ことを目的とする。 The present invention has been made in view of these conventional problems, and provides a resin shaft with a shaft that does not cause clogging during sliding rotation in the sleeve shaft hole even if burrs are formed on the shaft due to resin molding. The purpose is to provide manufactured gears.
この目的を達成するため本発明は、軸付樹脂製
歯車の軸部を形成する割り金型をずらせた状態で
軸部を樹脂成形して軸部断面形状を中心位置のず
れた半円の連設形状とし、金型の合せ目にバリを
生じても軸部のずらし成形で生じたスリーブ軸穴
とのすき間にバリを逃し、バリによる目づまりを
防止するようにしたものである。 In order to achieve this object, the present invention involves resin molding the shaft part with the split molds that form the shaft part of a resin gear with a shaft being shifted, so that the cross-sectional shape of the shaft part is a series of semicircles with shifted center positions. Even if burrs occur at the joint of the mold, the burrs will escape into the gap between the shaft hole and the sleeve shaft hole, which is created by shifting the shaft portion, and prevent clogging due to burrs.
以下、本発明の実施例を図面に基づいて説明す
る。 Embodiments of the present invention will be described below based on the drawings.
第４図は本発明の軸付樹脂製歯車の一実施例を
示した説明図である。 FIG. 4 is an explanatory view showing an embodiment of the shafted resin gear of the present invention.
まず、構成を説明すると、１はトランスミツシ
ヨンに組込まれたスピードメータドライブギアに
噛み合わされる軸付樹脂製歯車であり、歯車１の
一端に軸部１０を一体に形成しており、軸部１０
の先端は径の絞りをもつてワイヤ装着部１１を形
成している。 First, to explain the configuration, reference numeral 1 is a resin gear with a shaft that meshes with a speedometer drive gear incorporated in the transmission.A shaft portion 10 is integrally formed at one end of the gear 1. 10
The tip has a diameter constriction to form a wire attachment part 11.
第５図は第４図における軸部１０のＡ−Ａ断面
図を示したもので、本発明の軸付樹脂製歯車にお
ける軸部１０は中心Ｏ１，Ｏ２が所定寸法ずれた
半円を連設した形状をもち、このずらしにより軸
周の相対した位置に段部１２を形成し、段部１２
の高さ、即ち中心位置Ｏ１，Ｏ２のずれ寸法ｌは
ｌ＝0.05mm程度としている。 FIG. 5 shows an A-A cross-sectional view of the shaft portion 10 in FIG. 4, and the shaft portion 10 in the shafted resin gear of the present invention has semicircles with centers O1 and O2 shifted by a predetermined dimension. This shift forms step portions 12 at opposite positions on the shaft circumference, and the step portions 12
, that is, the deviation dimension l between the center positions O1 and O2 is approximately 0.05 mm.
この第５図に示す軸部１０の形成は第６図に示
すように軸部１０を樹脂成形する割り金型５，
５′を寸法ｌ分だけずらして組合わせた状態での
樹脂成形により容易に実現することが出来る。 The formation of the shaft portion 10 shown in FIG.
This can be easily realized by resin molding in a state in which the parts 5' are shifted by a dimension 1 and combined.
次に本発明の作用を説明する。 Next, the operation of the present invention will be explained.
まず、第６図に示す寸法ｌ分だけずらした割り
金型５，５′をもつて軸付樹脂製歯車を樹脂成形
すると、割り金型５，５′の合せ目の隙間により
第７図に取り出して示す段部１２の外側にバリ７
が生ずるようになる。このように軸周にバリ７を
生じた本発明の軸付樹脂製歯車の軸部１０は第８
図に示すようにスリーブ２の軸穴に挿入した状態
で段部１２の形成をもつて軸穴との間に隙間１４
が生じ、軸部１０の回転方向が矢印で示すように
右回りであつたとすると、第７図に示すように段
部１２の外側に生じたバリ７は軸部１０の摺動回
転で潰され、隙間１４に逃げ込むことになる。こ
のため軸部１０の軸周にバリ７が生じていても軸
部の摺動回転により剥離したバリがスリーブ軸穴
との隙間１４に入り込み、摺動回転軸の焼き付き
を起してしまうことが確実に防止出来る。又、第
８図から明らかなように段部１２の形成はスリー
ブ２に対する軸部１０の回転方向により決められ
るもので、例えば第８図において軸部１０の回転
方向が逆方向となる左回転の場合には、第６図に
示す一方の金型５を右側にずらすと共に他方の金
型５′を左側にずらし、このような金型のずらし
をもつて軸周に段部１２を形成し、スリーブ２に
軸部１０を挿入した時の隙間１４が常に回転方向
に対し後ろ側に位置するように段部を形成する。 First, when a resin gear with a shaft is resin-molded using the split molds 5 and 5' that are shifted by the dimension 1 shown in Fig. 6, the gap between the joints of the split molds 5 and 5' creates the shape shown in Fig. 7. There is a burr 7 on the outside of the stepped portion 12 shown after taking it out.
begins to occur. The shaft portion 10 of the shafted resin gear of the present invention, which has the burr 7 on the shaft circumference in this way, has the eighth
As shown in the figure, when the sleeve 2 is inserted into the shaft hole, the stepped portion 12 is formed, and a gap 14 is formed between the sleeve 2 and the shaft hole.
If this occurs and the direction of rotation of the shaft portion 10 is clockwise as shown by the arrow, the burr 7 formed on the outside of the stepped portion 12 will be crushed by the sliding rotation of the shaft portion 10, as shown in FIG. , will escape into the gap 14. Therefore, even if burrs 7 are formed on the periphery of the shaft portion 10, the burrs separated by the sliding rotation of the shaft portion will enter the gap 14 between the sleeve shaft hole and cause seizing of the sliding rotation shaft. It can definitely be prevented. Further, as is clear from FIG. 8, the formation of the stepped portion 12 is determined by the direction of rotation of the shaft portion 10 with respect to the sleeve 2. For example, in FIG. In this case, one of the molds 5 shown in FIG. 6 is shifted to the right and the other mold 5' is shifted to the left, and a stepped portion 12 is formed around the shaft with such a shift of the molds, The step part is formed so that the gap 14 when the shaft part 10 is inserted into the sleeve 2 is always located on the rear side with respect to the rotation direction.
以上説明してきたように本発明によれば、軸付
樹脂製歯車の回転摺動軸部の断面形状を軸部を樹
脂成形する割り金型をずらすことにより中心位置
のずれた半円の連接形状としたため、金型の合せ
目の隙間によつて樹脂成形した軸部にバリを生じ
てもスリーブ軸穴に軸部を挿入した時に軸穴との
間にバリを逃がすための隙間が形成され、バリに
よる軸穴の隙間の目づまりで生ずる焼き付けを確
実に防止することが出来、又バリ取りも不要であ
ることから軸付樹脂製歯車の加工工数を低減する
ことも出来る。 As explained above, according to the present invention, the cross-sectional shape of the rotating and sliding shaft portion of a resin gear with a shaft is changed to a semicircular connected shape whose center position is shifted by shifting the split mold for molding the shaft portion with resin. Therefore, even if burrs occur on the resin-molded shaft due to the gap between the mold joints, when the shaft is inserted into the sleeve shaft hole, a gap is formed between the sleeve and the shaft hole to allow the burr to escape. It is possible to reliably prevent seizure caused by clogging of the gap in the shaft hole due to burrs, and since there is no need to remove burrs, it is also possible to reduce the number of man-hours required for processing resin gears with shafts.
第１図は従来の軸付樹脂製歯車を用いたスピー
ドメータ用被駆動歯車機構の断面図、第２図は歯
車軸部を成形する割り金型の説明図、第３図は軸
部に生じたバリの断面説明図、第４図は本発明の
一実施例を示した説明図、第５図は第４図のＡ−
Ａ断面図、第６図は本発明に用いる割り金型のセ
ツト状態を示した断面図、第７図はバリの発生状
態を示した軸部の断面図、第８図はスリーブ軸穴
に対する軸部の軸挿状態を示した断面図である。
１：軸付樹脂製歯車、２：スリーブ、３，１
０：軸部、４：オイルシール、６：隙間、５，
５′：割り金型、７：バリ、１１：ワイヤ装着部、
１２：段部、１４：隙間。
Figure 1 is a cross-sectional view of a conventional driven gear mechanism for a speedometer using a resin gear with a shaft, Figure 2 is an explanatory diagram of a split mold for molding the gear shaft, and Figure 3 is a diagram showing the formation of the shaft. FIG. 4 is an explanatory diagram showing one embodiment of the present invention, and FIG.
A sectional view, FIG. 6 is a sectional view showing the set state of the split mold used in the present invention, FIG. 7 is a sectional view of the shaft showing the state of burr generation, and FIG. 8 is a sectional view of the shaft relative to the sleeve shaft hole. FIG. 1: Resin gear with shaft, 2: Sleeve, 3, 1
0: Shaft, 4: Oil seal, 6: Gap, 5,
5': Split mold, 7: Burr, 11: Wire attachment part,
12: Stepped portion, 14: Gap.
Claims (1)
歯車において、 前記回転摺動軸部の断面形状を、軸部を樹脂成
形する割り金型をずらすことにより中心位置のず
れた半円の連設形状としたことを特徴とする軸付
樹脂製歯車。[Scope of Claims] 1. In a resin gear with a shaft formed integrally with a rotating and sliding shaft, the cross-sectional shape of the rotating and sliding shaft can be centered by shifting a split mold for resin-molding the shaft. A resin gear with a shaft characterized by a series of semicircular shapes with shifted positions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21967782A JPS59110956A (en) | 1982-12-15 | 1982-12-15 | Resin gear with shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21967782A JPS59110956A (en) | 1982-12-15 | 1982-12-15 | Resin gear with shaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59110956A JPS59110956A (en) | 1984-06-27 |
| JPS6319751B2 true JPS6319751B2 (en) | 1988-04-25 |
Family
ID=16739240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21967782A Granted JPS59110956A (en) | 1982-12-15 | 1982-12-15 | Resin gear with shaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59110956A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100336161C (en) * | 1997-06-11 | 2007-09-05 | 东芝照明技术株式会社 | Fluorescent lamp. lamp-bulb type fluorescent lamp and lighting appliance |
-
1982
- 1982-12-15 JP JP21967782A patent/JPS59110956A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100336161C (en) * | 1997-06-11 | 2007-09-05 | 东芝照明技术株式会社 | Fluorescent lamp. lamp-bulb type fluorescent lamp and lighting appliance |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59110956A (en) | 1984-06-27 |
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