JPS58225263A - Screw gear made of resin - Google Patents

Screw gear made of resin

Info

Publication number
JPS58225263A
JPS58225263A JP10887282A JP10887282A JPS58225263A JP S58225263 A JPS58225263 A JP S58225263A JP 10887282 A JP10887282 A JP 10887282A JP 10887282 A JP10887282 A JP 10887282A JP S58225263 A JPS58225263 A JP S58225263A
Authority
JP
Japan
Prior art keywords
screw
gear
face
tip
tooth
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
Application number
JP10887282A
Other languages
Japanese (ja)
Other versions
JPS6253744B2 (en
Inventor
Tsuyoshi Terauchi
強 寺内
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Univance Corp
Original Assignee
Fuji Tekko Co Ltd
Fuji Iron Works Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Tekko Co Ltd, Fuji Iron Works Co Ltd filed Critical Fuji Tekko Co Ltd
Priority to JP10887282A priority Critical patent/JPS58225263A/en
Publication of JPS58225263A publication Critical patent/JPS58225263A/en
Publication of JPS6253744B2 publication Critical patent/JPS6253744B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Gears, Cams (AREA)

Abstract

PURPOSE:To prevent the production of burrs in manufacturing a screw gear by way of injection molding, by embedding the tip parts of gear teeth located at one end face of the gear, and cutting off the tip portions of the gear teeth located at the other end face and retracting the same inwards from the end face of the gear. CONSTITUTION:The tip portions of gear teeth 2 located on the side of one end face 4' of a screw gear 1 made of resin are embedded at 10 from the end face 4' over a prescribed width l1, while the tip parts 12 of the gear teeth 12 located on the side of the other end face 4 of the gear 2 are not cut at the end face 4 but cut off to end at the flat tooth bottom 14 on the side of the end face 4. Further, the tip parts 12 of the gear teeth 2 cut off to terminate at the flat tooth bottom 14 are retracted from the end face 4 over a prescribed width l2 so that a retracted part 15 contiguous with the flat tooth bottom 14 is formed between the end face 4 and the tip parts 12.

Description

【発明の詳細な説明】 本発明は、車両用変速機のスピードメータドライブギヤ
等に用いられる複数条のネジ歯を外周に形成した樹脂製
ネジ歯車に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin screw gear having a plurality of threaded teeth formed on its outer periphery, which is used in a speedometer drive gear of a vehicle transmission or the like.

従来、この種の樹脂製ネジ歯車としては、例えば第1,
2図に示すようなものがある。
Conventionally, as this type of resin screw gear, for example, the first,
There is something like the one shown in Figure 2.

すなわち、樹脂製ネジ歯車lはナイロン66等の耐熱耐
摩耗性樹脂の射出成形によシ作シ出され、外周に複数条
のネジ歯2を形成すると共に、内側にシャフトを嵌合す
る軸穴3を備えている。
That is, the resin threaded gear l is produced by injection molding of heat-resistant and wear-resistant resin such as nylon 66, and has a plurality of threaded teeth 2 formed on the outer periphery and a shaft hole in which the shaft is fitted. It has 3.

しかしながら、このような従来の樹脂製ネジ歯車にあっ
ては、複数条のネジ歯2が一定のねじれ角をもって形成
されているため、歯車端面部4゜4’におけるネジ歯2
の先端部5が端面部4.4′で切られることで先端部5
は鋭角で肉薄となって終るようになシ、射出成形の際に
ネジ歯本体を型取りした金型と、この金型端面を塞ぐ間
型とのすき間によシ肉薄となったネジ歯先端部5にパリ
が発生し易く、また樹脂製ネジ歯車lの使用中に強度の
弱いネジ歯先端部の射出成形型が欠けてネジ歯2が破損
するという問題点があった。
However, in such a conventional resin threaded gear, since the plurality of threaded teeth 2 are formed with a certain helix angle, the threaded teeth 2 at the gear end face 4° 4'
By cutting the tip 5 at the end surface 4.4', the tip 5
The tip of the screw tooth ends at an acute angle and becomes thinner, and the tip of the screw tooth becomes thinner in the gap between the mold that molded the screw tooth body during injection molding and the mold that closes the end surface of this mold. There was a problem in that burrs were likely to occur in the part 5, and that the injection mold for the tip of the threaded teeth, which was weak in strength, was chipped and the threaded teeth 2 were damaged during use of the resin screw gear l.

本発明は、このような従来の問題点に着目してなされた
もので、樹脂製ネジ歯車において、歯車端面部の一端に
位置するネジ歯先端部を一定幅に亘って埋設し、歯車端
面部の他端に位置するネジ歯先端部を歯底平坦部に終端
するように削除すると共に、該歯車端面部よシ一定幅に
亘ってネジ歯先端部を内側に後退させた歯形形状とする
こと罠よシ、上記問題点を解決することを目的とする。
The present invention has been made by focusing on such conventional problems, and in a resin screw gear, the tip of the screw tooth located at one end of the gear end face is buried over a certain width, and the end face of the gear is buried. The tip of the screw tooth located at the other end is removed so that it terminates at the flat part of the tooth bottom, and the tooth profile is formed such that the tip of the screw tooth is retreated inward over a certain width from the end surface of the gear. Trap Yoshi aims to solve the above problems.

以下、本発明を図面に基づいて説明する。Hereinafter, the present invention will be explained based on the drawings.

第8図は、本発明の一実施例を示した説明図でアシ、第
4図にその端面図を示す。
FIG. 8 is an explanatory diagram showing an embodiment of the present invention, and FIG. 4 is an end view thereof.

まず、構成を説明すると、1はナイロン66等の耐熱耐
摩耗性樹脂の射出成形によシ作られた樹脂製ネジ歯車で
アシ、外周に複数条、例えば6条j    のネジ歯2
を所定のねじシ角をもって形成し、内側にシャフトに嵌
着する軸穴3を備えている。
First, to explain the structure, 1 is a resin screw gear made by injection molding of heat-resistant and abrasion-resistant resin such as nylon 66, and has screw teeth 2 with a plurality of threads, for example, 6 threads, on the outer circumference.
is formed with a predetermined thread angle, and is provided with a shaft hole 3 on the inside into which a shaft is fitted.

このような樹脂製ネジ歯車2の一方の端面部4′側圧位
置するネジ歯2のネジ歯先端部は、端面部4′より一定
幅λ1に亘って埋設部10の形成により埋設されておシ
、一方、端面部4@に位置するネジ歯先端部12はネジ
歯先端部12が端面部4によシ切られずに端面部4側の
歯底平坦部14に終端するように削除された形状とされ
ておシ、更に歯底平坦部14に終端するように削除され
たネジ歯先端部12は端面部4よシ一定幅らに亘って後
退され、端面部4とネジ歯先端部12の間に歯底平坦部
14に連なる後退部15を形成している。
The screw tooth tips of the screw teeth 2 which are located on the side of one end surface 4' of the resin screw gear 2 are buried by forming a buried portion 10 over a certain width λ1 from the end surface 4'. , On the other hand, the screw tooth tip 12 located at the end surface 4@ has a shape in which the screw tooth tip 12 is not cut by the end surface 4 but terminates at the bottom flat portion 14 on the end surface 4 side. In addition, the threaded tooth tip 12 that has been removed so as to terminate at the bottom flat portion 14 is retracted over a certain width from the end surface 4, and the end surface 4 and the threaded tooth tip 12 are removed. A retracted portion 15 that continues to the tooth bottom flat portion 14 is formed in between.

ここで埋設部10の埋設幅も及び後退部15の後退幅ら
としては、例えば第8.4図に示す実寸法の樹脂製ネジ
歯車を例に取ると、埋設幅も=0.5〜1.5語、後退
幅1. = 0.5鰺以上とすることが望ましい。
Here, as for the buried width of the buried portion 10 and the retreat width of the retreated portion 15, for example, taking the resin screw gear of the actual size shown in Fig. 8.4 as an example, the buried width is also = 0.5 to 1. .5 words, setback width 1. = 0.5 mackerel or more is desirable.

次に作用を説明する。               
 11まず、本発明の樹脂製ネジ歯車lを射出成形する
際には、端面部4′側のネジ歯先端部は埋設部10の形
成によシ、端面部4′から一定幅らに亘って埋め込まれ
ているので埋設部lOに対するネジ歯先端部の終端で端
面部4′側のネジ歯先端部にパリは発生せず、又、端面
部4側のネジ歯先端部12は歯底平坦部14に終端する
ように削除され、更に端面部4よシ一定幅!、をもり後
退部15の形成によシ後退されているため、端面部4に
位置する金部隙間によるパリを発生することがなく、そ
のため、樹脂製ネジ歯車1を射出成形した後のパリ取シ
作業を不要にすることができる。
Next, the effect will be explained.
11 First, when injection molding the resin screw gear l of the present invention, the tips of the screw teeth on the end surface portion 4' side are formed over a certain width from the end surface portion 4' due to the formation of the embedded portion 10. Because it is embedded, no burr occurs at the end of the threaded tooth tip on the end face 4' side at the end of the threaded tooth tip with respect to the buried part IO, and the threaded tooth tip 12 on the end face 4 side is flat on the tooth bottom. 14, and a constant width from the end face 4! , are retracted by the formation of the recessed portion 15, so there is no possibility of deburring due to the gap between the metal parts located at the end face portion 4. Therefore, deburring after injection molding of the resin screw gear 1 is possible. This eliminates the need for cleaning work.

一方、本発明の樹脂製ネジ歯車1を車両用変速機のスピ
ードメータドライブギヤとして使用した場合、樹脂製ネ
ジ歯車1のネジ歯2に他のネジ歯車が噛合っても端面部
4′側のネジ歯2の先端部は埋設部lOの形成によシ補
強され、且つ端面部4側のネジ歯先端部12は歯底平坦
部14に終端するように削除されているため、他の歯車
との噛合いによってもネジ歯先端部12が欠けてネジ歯
2が破損することは確実に防止され、樹脂製ネジ歯車の
信頼性と耐久性を確保することができる。
On the other hand, when the resin screw gear 1 of the present invention is used as a speedometer drive gear of a vehicle transmission, even if another screw gear meshes with the screw teeth 2 of the resin screw gear 1, the end face 4' side The tip of the screw tooth 2 is reinforced by forming the embedded part 1O, and the screw tooth tip 12 on the end face 4 side is removed so as to terminate at the tooth bottom flat part 14, so that it is not connected to other gears. This meshing also reliably prevents the threaded tooth tips 12 from chipping and the threaded teeth 2 from being damaged, thereby ensuring the reliability and durability of the resin threaded gear.

以上説明してきたように、本発明によれば、複数条のネ
ジ歯を外周に形成した樹脂製ネジ歯車に於いて、歯車端
面部の一端に位置するネジ歯先端部を一定幅に亘って埋
設し、歯車端面部の他端に位置するネジ歯先端部を歯底
平坦部に終端するように削除すると共に、このネジ歯先
端部よシ一定幅に亘ってネジ歯先端部を内側に後退させ
るネジ歯形状としたため、樹脂製ネジ歯車を射出成形し
た時のネジ歯先端部に生ずるパリの発生を確実に防止し
、射出成形後に於けるパリ取9作業及びパリの有無を確
認するための目視検査を不要とし、樹脂製ネジ歯車の生
産性を大幅に向上することができる。
As explained above, according to the present invention, in a resin screw gear in which a plurality of threaded teeth are formed on the outer periphery, the tip of the screw tooth located at one end of the gear end surface is buried over a certain width. Then, the tip of the screw tooth located at the other end of the gear end face is removed so that it terminates at the flat part of the tooth bottom, and the tip of the screw tooth is retreated inward over a certain width from the tip of the screw tooth. The threaded tooth shape reliably prevents the occurrence of burrs at the tip of the threaded teeth when resin screw gears are injection molded. This eliminates the need for inspection and greatly improves the productivity of resin screw gears.

又、一方のネジ歯先端部は埋設部の形成によシ埋め込ま
れ、他方のネジ歯先端部は歯底平坦部に終端するように
削除されると共に端面部よシ一定幅だけ後退した位置に
終端させているため、各ネジ歯先端部の噛合い強度が高
められ、使用中にネジ歯先端部が欠けてネジ歯が破損す
ることが防止され、樹脂製ネジ歯車の信頼性と耐久性を
向上することができるという効果も得られる・
In addition, the tip of one screw tooth is buried by forming a buried part, and the tip of the other screw tooth is removed so as to end at the flat part of the tooth bottom, and at a position set back by a certain width from the end surface. Because the ends are terminated, the meshing strength of the tips of each screw tooth is increased, preventing the tips of the screw teeth from chipping and damaging the screw teeth during use, and increasing the reliability and durability of resin screw gears. You can also get the effect of being able to improve your

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は従来例を示した説明図、第2図は第1図の端面
図、第8図は本発明の一実施例を示した説明図、第4図
は第8図の端面図である。 l・・・樹脂製ネジ歯車 2・・・ネジ歯3・・・軸穴
      4.4′・・・端面部lO・・・埋設部 
   12・・・ネジ歯先端部14・−・歯底平坦部 
 15・・・後退部特許出願人 株式会社富士鉄工所 代理人 弁理士 竹  内    進 第3図 第4図
Fig. 1 is an explanatory view showing a conventional example, Fig. 2 is an end view of Fig. 1, Fig. 8 is an explanatory view showing an embodiment of the present invention, and Fig. 4 is an end view of Fig. 8. be. l... Resin screw gear 2... Screw teeth 3... Shaft hole 4.4'... End face lO... Buried part
12...Screw tooth tip 14...Flat bottom part
15...Backwards patent applicant Fuji Iron Works Co., Ltd. Agent Patent attorney Susumu Takeuchi Figure 3 Figure 4

Claims (1)

【特許請求の範囲】[Claims] (1)複数条のネジ歯を外周に形成した樹脂製ネジ歯車
に於いて、 歯車端面部の一端に位置するネジ歯先端部を一定幅罠亘
って埋設し、歯車端面部の他端に位置するネジ歯先平端
部を歯底平坦部に終端するように削除すると共に諷歯車
端面部より一定l!に亘ってネジ歯先端部を内側に後退
させたことを特徴とする樹脂製ネジ歯車。 (匂 前記ネジ歯先端部の一方の埋設幅t−0,5/i
L至1.5 ミリメートルとし、ネジ歯先端部の他方の
後退幅を0.5 ミリメートル以上とした特FFH*求
の範囲第1項記載の樹脂製ネジ歯車。
(1) In a resin screw gear with multiple threaded teeth formed on the outer periphery, the tip of the screw tooth located at one end of the gear end face is buried across a fixed width trap, and the tip located at the other end of the gear end face is buried. The flat end of the screw tooth tip is removed so that it terminates at the flat part of the tooth bottom, and a constant l! A resin screw gear characterized in that the tips of the screw teeth are retracted inward over the entire length. (Oil) One of the embedded width t-0,5/i of the tip of the screw tooth
The resin screw gear according to item 1, wherein L to 1.5 mm and the recess width of the other end of the screw teeth is 0.5 mm or more.
JP10887282A 1982-06-24 1982-06-24 Screw gear made of resin Granted JPS58225263A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10887282A JPS58225263A (en) 1982-06-24 1982-06-24 Screw gear made of resin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10887282A JPS58225263A (en) 1982-06-24 1982-06-24 Screw gear made of resin

Publications (2)

Publication Number Publication Date
JPS58225263A true JPS58225263A (en) 1983-12-27
JPS6253744B2 JPS6253744B2 (en) 1987-11-11

Family

ID=14495723

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10887282A Granted JPS58225263A (en) 1982-06-24 1982-06-24 Screw gear made of resin

Country Status (1)

Country Link
JP (1) JPS58225263A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5463853U (en) * 1977-10-14 1979-05-07
JPS56148140U (en) * 1980-04-08 1981-11-07
JPS5763143U (en) * 1980-09-30 1982-04-15

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5463853U (en) * 1977-10-14 1979-05-07
JPS56148140U (en) * 1980-04-08 1981-11-07
JPS5763143U (en) * 1980-09-30 1982-04-15

Also Published As

Publication number Publication date
JPS6253744B2 (en) 1987-11-11

Similar Documents

Publication Publication Date Title
US4825932A (en) Method of making diecast inserts
US5797710A (en) Thread forming tap
US7402016B2 (en) Variably threaded screw
US2352982A (en) Screw for plastics
KR100683062B1 (en) Thread forming tap and threading method
JP2002539388A5 (en)
US6171040B1 (en) Thread insert having detachable tongue
CA3028116C (en) Sleeve-component extracting jig
US2977726A (en) Gear honing tool
JPS58225263A (en) Screw gear made of resin
US11007590B2 (en) Thread forming tap and manufacturing method for thread forming tap
JPS58225262A (en) Screw gear made of resin
CN211623914U (en) BOSS column structure with internal and external thread metal inserts
JPS58225261A (en) Screw gear made of resin
JP4133767B2 (en) Rolling tool
US7862441B2 (en) Self aligning die
JP5241557B2 (en) Self tapping insert
JP2009097683A (en) Worm and worm manufacturing die
JP3025044U (en) Male thread member and its processing tool
JP2533861Y2 (en) Tap for thread cutting
CN220904160U (en) Connecting hole injection molding structure, injection molding piece and electrical equipment
JPS6015622Y2 (en) cutting tap
TWI472391B (en) A method for forming screws
KR100845123B1 (en) Eject pin and manufacturing process thereof
TWM582082U (en) Cracking-proof wood screw