JPS6127762A - Steering wheel for vehicles - Google Patents
Steering wheel for vehiclesInfo
- Publication number
- JPS6127762A JPS6127762A JP14921784A JP14921784A JPS6127762A JP S6127762 A JPS6127762 A JP S6127762A JP 14921784 A JP14921784 A JP 14921784A JP 14921784 A JP14921784 A JP 14921784A JP S6127762 A JPS6127762 A JP S6127762A
- Authority
- JP
- Japan
- Prior art keywords
- steering wheel
- polypropylene
- resin layer
- synthetic resin
- azodicarbonamide
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
- B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
- B62D1/04—Hand wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/1266—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being completely encapsulated, e.g. for packaging purposes or as reinforcement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3047—Steering wheels
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Steering Controls (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は車輌用ステアリングに係るものである。[Detailed description of the invention] (Industrial application field) The present invention relates to a steering for a vehicle.
（従来技術）
従来公知の車輌用ステアリングは、ステアリンクスコー
プｄの外周に環状のステアリング芯金すを取付けたもの
を、型内に収納して、この型内にポリプロピレンを供給
して、ステアリングａを射出成形していた。(Prior art) In the conventionally known vehicle steering system, a steering link scope d with an annular steering core metal attached to the outer periphery is housed in a mold, polypropylene is supplied into the mold, and the steering wheel a is was injection molded.
（発明が解決しようとする問題点）
前記のステアリングａの欠点は、第４図、第５図のよう
に、ステアリングａのウェルド部Ｃ（左右側から型内を
ポリプロピレンが流れて出会うところ）のポリプロピレ
ンが冷えたときの収縮により、芯金すと樹脂とが１に空
洞りが生じる。従って、９ウ工ルド部Ｃの、有効樹脂断
面積は小さくなり、収縮応力が繰り返されると、いわゆ
るグリップ割れｉ （第６図）が生じる欠陥があった。(Problems to be Solved by the Invention) The disadvantage of the above-mentioned steering wheel a is that, as shown in FIGS. When the polypropylene cools, it shrinks, creating a cavity between the core metal and the resin. Therefore, the effective resin cross-sectional area of the 9-wound portion C becomes small, and when shrinkage stress is repeated, there is a defect in that so-called grip cracking i (FIG. 6) occurs.
また、前記とは異なるがステアリングａのステアリング
スポークｄの接合部分を包囲する樹脂が、上下表裏面と
もヒケｅ（外観上に表われる樹脂の収縮による凹みを当
業者はヒケと呼んでいる）が生じて、外観上の見栄えが
悪くなるという別の欠陥も生じた。Although different from the above, the resin surrounding the joints of the steering spokes d of the steering wheel a has sink marks e (a dent that appears on the outside due to shrinkage of the resin is called a sink mark by those skilled in the art) on both the top and bottom surfaces. Another defect was caused by the resulting unsightly appearance.
即ち、第７図のように、本来は、ステアリングスポーク
ｄの接合部分゛゛の樹脂の表面ｆは点線のようにならな
ければならないのに、その部分は上下表裏ともヒケｅが
生じた。That is, as shown in FIG. 7, although the surface f of the resin at the joint part ``'' of the steering spoke d should be as shown by the dotted line, sink marks e occurred on both the top and bottom sides of that part.
この対策として、型内の成形圧力を高くする方法がとら
れるが、しかし、ウェルド部Ｃの樹脂と芯金すとの空洞
は小さくなっても完全ではなく、しかも、射出圧力と型
締力の高い成形機を使用しなければならない。As a countermeasure to this, a method is taken to increase the molding pressure inside the mold, but even if the cavity between the resin in the weld part C and the core metal is made smaller, it is not perfect, and furthermore, the injection pressure and mold clamping force are An expensive molding machine must be used.
また、ステアリングスポークｄの上側の表面にヒケｅ防
止用プレートｇを埋め込む技術もあるが、工程が増加し
、コストアップとなる。There is also a technique of embedding a sink mark e prevention plate g in the upper surface of the steering spoke d, but this increases the number of steps and costs.
また、水により急速に冷却する方法もとられるが、ヒケ
ｅは生じないものの、ステアリングスポークｄなどの金
属部分に錆が生じる別の新たな欠陥が生じる。In addition, a method of rapidly cooling with water is also used, but although sink marks e do not occur, another new defect occurs in which metal parts such as steering spokes d rust.
（問題を解決するための手段）
そこで本発明は、ステアリングホイール芯金の外周に設
けた型内にポリプロピレンを供給して成形するに当り、
前記ポリプロピレンに微量の発泡剤を添加して成形した
車輌用ステアリング、および、ステアリングホイール芯
金の外周に設けた型内にポリプロピレンを供給して成形
するに当り、前記ポリプロピレン１００に対シて０．０
５〜０．５重量％ののアゾジカルボンアミドを添加した
マスターバッチを使って成形した車輌用ステアリングの
構成を要旨としたものである。(Means for Solving the Problems) Therefore, in the present invention, when supplying and molding polypropylene into a mold provided on the outer periphery of a steering wheel core metal,
A vehicle steering wheel is formed by adding a small amount of a foaming agent to the polypropylene, and when the polypropylene is supplied and molded into a mold provided on the outer periphery of the steering wheel core metal, 0. 0
The gist of the present invention is a structure of a vehicle steering wheel molded using a masterbatch containing 5 to 0.5% by weight of azodicarbonamide.
図により本発明の一実施例を説明すると、１は車輌用の
ステアリング、２はステアリング１のホイール部、３は
ホイール部２の芯金、４は芯金３の周囲の合成樹脂層で
ある。本発明では、ステアリング１の射中成形用の型内
に供給する合成樹脂層４をポリプロピレンに発泡剤とし
てアゾジカルボンアミド（有機固体発泡剤）を添加した
マスターバッチを使って成形する。アゾジカルボンアミ
ドの混入率は、好適にはポリプロピレン１００に対して
０．０５〜０．５重量％になるようにする。この混入率
が低いと、冷えて固ったポリプロピレンの合成樹脂層４
に十分な発泡５ができず、ホイール部２のウェルド部６
の芯金３と合成樹脂層４との間に空洞が生じ、混入率が
高過ぎるとステアリングｌの合成樹脂層４の表面にまで
発泡５してしまい、ざらつきが生じることとなる。An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a steering wheel for a vehicle, 2 a wheel portion of the steering wheel 1, 3 a core bar of the wheel portion 2, and 4 a synthetic resin layer around the core bar 3. In the present invention, the synthetic resin layer 4 to be supplied into the mold for injection molding of the steering wheel 1 is molded using a masterbatch of polypropylene to which azodicarbonamide (organic solid foaming agent) is added as a foaming agent. The mixing ratio of azodicarbonamide is preferably 0.05 to 0.5% by weight based on 100% of polypropylene. If this mixing rate is low, the polypropylene synthetic resin layer 4 will cool and harden.
The weld part 6 of the wheel part 2 cannot be sufficiently foamed.
A cavity is formed between the core metal 3 and the synthetic resin layer 4, and if the mixing rate is too high, foaming 5 will occur even on the surface of the synthetic resin layer 4 of the steering wheel l, resulting in roughness.
７はスポーク部、８はスポーク部７がホイール部２の芯
金３に溶着されている部分の合成樹脂層４の肉厚部分で
ある。7 is a spoke portion, and 8 is a thick portion of the synthetic resin layer 4 where the spoke portion 7 is welded to the core metal 3 of the wheel portion 2.
（作用中効果）
本発明は、射出成形の型に供給する合成樹脂層４をポリ
プロピレンに発泡剤であるアゾジカルボンアミドを添加
したマスターバッチを使って成形したので、ウェルド部
６の部分の芯金３と合成樹脂層４との間に空洞部が生じ
ない。そのため、収縮応力がステアリング１のホイール
部２のウェルド部６に集中しないから、いわゆるグリッ
プ割れｉ（第６図）が生じない。(Effect during operation) In the present invention, the synthetic resin layer 4 to be supplied to the injection molding mold is molded using a masterbatch containing polypropylene and azodicarbonamide, which is a foaming agent. No cavity is formed between the synthetic resin layer 3 and the synthetic resin layer 4. Therefore, the shrinkage stress is not concentrated on the weld portion 6 of the wheel portion 2 of the steering wheel 1, so that so-called grip cracking i (FIG. 6) does not occur.
したがって、耐久性が向上し、成形圧力を高くしないで
済むので、普通の成形機で形成できる。Therefore, durability is improved and molding pressure does not need to be increased, so that it can be formed using an ordinary molding machine.
また、アゾジカルボンアミドを添加したマスターバッチ
を使ってヒケを防止しているから、ステアリング１のス
ポーク部７とホイール部２の接合部分の肉厚部８の外観
の見栄えが良くなる。Furthermore, since sink marks are prevented by using a masterbatch containing azodicarbonamide, the appearance of the thick portion 8 at the joint between the spoke portion 7 of the steering wheel 1 and the wheel portion 2 is improved.
従って、ヒケ防止用のプレートを取付ける工程を省略で
きてコストダウンになる。Therefore, the step of attaching a plate for preventing sink marks can be omitted, resulting in cost reduction.
第１図はステアリングの平面図、第２図は一第１図のウ
ェルド部の拡大図、第３図は第１図の肉厚部の拡大図、
第４図は公知例の平面図、第５〜６図は公知例のウェル
ド′部の拡大図、第７〜８図は公知−σの肉厚部の拡大
図である。
符号の説明
１・・・ステアリング、２・・・ホイール部、３・・・
芯金、４・・・合成樹脂層、５・・・発泡、６・・・ウ
ェルド部、７・・・スポーク部、８・・・肉厚部。Figure 1 is a plan view of the steering wheel, Figure 2 is an enlarged view of the weld part in Figure 1, Figure 3 is an enlarged view of the thick part in Figure 1,
FIG. 4 is a plan view of the known example, FIGS. 5 and 6 are enlarged views of the weld' portion of the known example, and FIGS. 7 and 8 are enlarged views of the thick portion of the known -σ. Explanation of symbols 1...Steering, 2...Wheel part, 3...
Core metal, 4... Synthetic resin layer, 5... Foaming, 6... Weld part, 7... Spoke part, 8... Thick part.
Claims (2)
ポリプロピレンを供給して成形するに当り、前記ポリプ
ロピレンに微量の発泡剤を添加して成形した車輌用ステ
アリング。(1) A vehicle steering wheel manufactured by adding a small amount of a foaming agent to polypropylene and molding it by supplying polypropylene into a mold provided on the outer periphery of a steering wheel core metal.
ポリプロピレンを供給して成形するに当り、前記ポリプ
ロピレン１００に対して０．０５〜０．５重量％のアゾ
ジカルボンアミドを添加したマスターバッチを使って成
形した車輌用ステアリング。(2) When supplying and molding polypropylene into a mold provided on the outer periphery of the steering wheel core metal, a masterbatch containing 0.05 to 0.5% by weight of azodicarbonamide based on the polypropylene 100 is added. Vehicle steering wheel molded using
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14921784A JPS6127762A (en) | 1984-07-18 | 1984-07-18 | Steering wheel for vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14921784A JPS6127762A (en) | 1984-07-18 | 1984-07-18 | Steering wheel for vehicles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6127762A true JPS6127762A (en) | 1986-02-07 |
Family
ID=15470408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14921784A Pending JPS6127762A (en) | 1984-07-18 | 1984-07-18 | Steering wheel for vehicles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6127762A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0437907A (en) * | 1990-06-01 | 1992-02-07 | Nachi Fujikoshi Corp | Smoothing acceleration/deceleration system |
| US6386579B1 (en) * | 1999-07-22 | 2002-05-14 | Breed Automotive Technology, Inc. | Steering wheel |
| JP2010241236A (en) * | 2009-04-03 | 2010-10-28 | Honda Motor Co Ltd | Steering wheel of vehicle and manufacturing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4995325A (en) * | 1973-01-18 | 1974-09-10 | ||
| JPS5463194A (en) * | 1977-10-15 | 1979-05-21 | Sekisui Plastics | Method of making foamable thermoplastic resin particles |
-
1984
- 1984-07-18 JP JP14921784A patent/JPS6127762A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4995325A (en) * | 1973-01-18 | 1974-09-10 | ||
| JPS5463194A (en) * | 1977-10-15 | 1979-05-21 | Sekisui Plastics | Method of making foamable thermoplastic resin particles |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0437907A (en) * | 1990-06-01 | 1992-02-07 | Nachi Fujikoshi Corp | Smoothing acceleration/deceleration system |
| US6386579B1 (en) * | 1999-07-22 | 2002-05-14 | Breed Automotive Technology, Inc. | Steering wheel |
| JP2010241236A (en) * | 2009-04-03 | 2010-10-28 | Honda Motor Co Ltd | Steering wheel of vehicle and manufacturing method thereof |
| US8499454B2 (en) | 2009-04-03 | 2013-08-06 | Honda Motor Co., Ltd. | Steering wheel of vehicle and manufacturing method of steering wheel of vehicle |
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