JPS62178472A - Steering rack and high frequency hardening therefor - Google Patents
Steering rack and high frequency hardening thereforInfo
- Publication number
- JPS62178472A JPS62178472A JP2090086A JP2090086A JPS62178472A JP S62178472 A JPS62178472 A JP S62178472A JP 2090086 A JP2090086 A JP 2090086A JP 2090086 A JP2090086 A JP 2090086A JP S62178472 A JPS62178472 A JP S62178472A
- Authority
- JP
- Japan
- Prior art keywords
- steering rack
- back surface
- hardened layer
- steering
- rack
- 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
- 230000006698 induction Effects 0.000 claims abstract description 35
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000003507 refrigerant Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000002826 coolant Substances 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 239000011148 porous material Substances 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 1
Landscapes
- Gears, Cams (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は自動車等車両のラックピニオン式操向ｇＷに用
いるステアリングラックの歯部と背面部に高周波焼入れ
による焼入硬化層を形成したステアリングラック及びそ
の高周波焼入方法に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a steering rack for use in rack and pinion type steering gW of vehicles such as automobiles, in which a hardened layer is formed by induction hardening on the teeth and back surface of the steering rack. and its induction hardening method.
ラックピニオン式操向装置のステアリングラックは、第
４図に示す如くピニオンと噛み合う複数のラック歯が形
成されており、ラック歯の耐摩耗性を向上するために歯
部に焼入れによる歯部焼入硬化層（２）が形成されてい
る。そして、昨今ステアリングラックの軸強度（特に耐
曲げ強度）を増すために、ステアリングラックの背面部
にも比較的広範囲に渡って焼入による背面部焼入硬化層
（３）を形成することが試みられている。そして、その
背面部に焼入硬化層（３）を形成する手段として、第５
図に示す如く略半円筒形の誘導コイル（１８）を用いた
高周波焼入れにより形成するものが特開昭５９−９１２
４号公報に開示されている。As shown in Figure 4, the steering rack of a rack and pinion type steering device is formed with a plurality of rack teeth that mesh with the pinion, and the teeth are hardened to improve the wear resistance of the rack teeth. A hardened layer (2) is formed. Recently, in order to increase the axial strength (especially bending strength) of the steering rack, attempts have been made to form a hardened layer (3) on the back surface of the steering rack over a relatively wide area. It is being As a means for forming a quench hardened layer (3) on the back surface,
As shown in the figure, a coil formed by induction hardening using a substantially semi-cylindrical induction coil (18) is disclosed in Japanese Patent Application Laid-Open No. 59-912.
It is disclosed in Publication No. 4.
しかし、前述の如きステアリングラックにおいては、背
面部に比較的広範囲に渡って焼入硬化層（３）を形成す
ることは熱処理歪が大きくなるという欠点がある。この
ため、後の矯正作業を困難なものとしていた。そして、
第５図に示す如く略半円筒形の誘導コイル（１８）によ
り焼入硬化層（３）を形成することは、熱処理歪の問題
の他にＭ’Ｓコイル（１８）がステアリングラックの径
により決定されるために、設備としての汎用性がなく、
ステアリングラックの径が変わるたびに、誘導コイルを
交換しなければならず、まして、広範囲に焼入硬化層を
形成することは消費電力を多大に費やすことになり、効
率の悪いものである。However, in the above-mentioned steering rack, forming the quench-hardened layer (3) over a relatively wide area on the back surface has the disadvantage that heat treatment distortion becomes large. This made subsequent correction work difficult. and,
As shown in FIG. 5, forming the hardened layer (3) using a substantially semi-cylindrical induction coil (18) is not only problematic due to heat treatment distortion, but also due to the diameter of the steering rack. Because it is determined, there is no versatility as equipment,
Each time the diameter of the steering rack changes, the induction coil must be replaced, and forming a hardened layer over a wide area consumes a large amount of power, which is inefficient.
本発明はステアリングラックの歯部の背面部に焼入硬化
層を形成して軸強度を増しながら、熱処理歪が少なく、
又効率の良い高周波焼入れが出来るステアリングラック
及びその高周波焼入方法を提供することを目的とする。The present invention forms a quenched hardened layer on the back surface of the teeth of the steering rack to increase the shaft strength while minimizing heat treatment distortion.
Another object of the present invention is to provide a steering rack that can be induction hardened with high efficiency, and a method for induction hardening thereof.
本発明のステアリングラックは第１図に示す如く、円形
断面軸に弦状に歯部を設けたステアリングラックの前記
歯部と背面部とに高周波焼入れによる焼入硬化層を形成
したステアリングラックにおいて、前記背面部に形成し
た背面部焼入硬化層を、ステアリングラック軸心（Ｏ）
を通り、歯底面（Ｐ１）に垂直な面（Ｐ２）より、車体
取付時の上側方向に角度θが１５°乃至３０＠傾いた面
（Ｐ３）を中心として左右略対称に、且一方の端部が前
記面（Ｐ２）と背面部との交点（Ｑ）を僅かに超える範
囲の断面略弓形に形成したもので、前記ステアリングラ
ックは、円形断面軸に弦状に歯部を設けたステアリング
ラックの前記歯部の背面部に高周波焼入れによる焼入硬
化層を形成するステアリングラックの高周波焼入方法に
おいて、略平坦面を有する誘導コイルを、その略平坦面
を、ステアリングラック軸心（Ｏ）を通り、歯底面（Ｐ
１）に垂直な面（Ｐ２）より、車体取付時の上側方向に
角度θが１５°乃至３０″傾いた面（Ｐ３）に垂直にス
テアリングラック背面部に対面させて配し、ステアリン
グラックの背面部を誘導コイルを流れる高周波電流によ
り所定温度に加熱し、この背面部に冷媒液を噴射して該
背面部に焼入硬化層を形成することにより得られる。As shown in FIG. 1, the steering rack of the present invention is a steering rack in which a quenched layer is formed by induction hardening on the teeth and the back surface of the steering rack, which has chord-shaped teeth on a circular cross-sectional shaft. The back surface hardened layer formed on the back surface is aligned with the steering rack axis (O).
from the plane (P2) perpendicular to the tooth bottom surface (P1), approximately symmetrically to the left and right with respect to the plane (P3) that is tilted upward at an angle θ of 15° to 30@ when installed on the car body, and at one end. The steering rack is formed in a substantially arcuate cross-section with a portion slightly exceeding the intersection (Q) of the surface (P2) and the back surface portion, and the steering rack is a steering rack in which a tooth portion is provided in a chord shape on a circular cross-sectional axis. In the induction hardening method for a steering rack, in which a hardened layer is formed by induction hardening on the back surface of the teeth, an induction coil having a substantially flat surface is connected to the steering rack axis (O) with the substantially flat surface. street, tooth root surface (P
1) The rear surface of the steering rack is arranged perpendicularly to the surface (P3) that is tilted upward at an angle θ of 15° to 30" from the surface (P2) perpendicular to the vehicle body, and faces the rear surface of the steering rack. It is obtained by heating the part to a predetermined temperature by a high frequency current flowing through an induction coil, and injecting a refrigerant liquid to the back part to form a hardened layer on the back part.
第１図に示す如く、車両走行時にステアリングラックに
最大荷重Ｆ１が作用する方向は、面（Ｐ２）から車体取
付時の水平面（Ｐ４）の範囲内に略集中し、しかもこの
範囲内又は近傍には略円形断面のステアリングラックと
して生しる断面係数の低い方向Ｆ２が存在する。この断
面係数が低い方向は対称に２ケ所存在するが、一方は走
行時に強い衝撃力が作用しないので機能上問題がない。As shown in Fig. 1, the direction in which the maximum load F1 acts on the steering rack when the vehicle is running is approximately concentrated within the range from the plane (P2) to the horizontal plane (P4) at the time of attachment to the vehicle body, and moreover, within or near this range. There is a direction F2 in which the section modulus is low, which occurs as a steering rack with a substantially circular cross section. There are two symmetrical directions in which the section modulus is low, but in one direction there is no functional problem because no strong impact force is applied during running.
そして、最大荷重Ｆ１は通常面（Ｐ２）とそれから１５
°偏位した範囲に最も集中し、断面係数の低い方向Ｆ２
は通常面（Ｐ２）から２０″〜３０″偏位した範囲に集
中する。したがって、最大荷重Ｆ１が作用する最も偏位
した角度１５６と断面係数が低い方向の最大角度３０″
との間が強度上置も重要である。And the maximum load F1 is 15 from the normal surface (P2)
Direction F2 with the lowest section modulus, most concentrated in the deviated range
is concentrated in a range deviated from the normal plane (P2) by 20'' to 30''. Therefore, the most deviated angle 156 where the maximum load F1 acts and the maximum angle 30'' in the direction of the lower section modulus
The strength between the two is also important.
そこで、ステアリングラックの背面部に、面（Ｐ２）よ
り１５°乃至３０＠傾いた面（Ｐ３）を中心に左右略対
称で、且一方の端部が断面係数の低い背面部中央（Ｑ）
を僅かに超える範囲で断面略弓形状に背画部焼入硬化Ｎ
（３）を形成するので、ステアリングラックとしての機
能上の軸強度を増す。しかも、局部的に硬化層を形成す
るので、熱処理歪が少ない。そして、略平坦面を有する
誘導コイルで焼入れすることで、局部的に硬化層を形成
することが出来、熱処理歪が少なく、ステアリングラッ
クの径に関係なく同一の誘４コイルが使用出来るので、
設備として汎用性に冨み、局部的に焼入れするので効率
が良い。Therefore, on the back side of the steering rack, a center (Q) of the back side that is approximately symmetrical with respect to the plane (P3) that is inclined 15° to 30 @ from the plane (P2), and one end has a low section modulus.
The back part is quenched and hardened to a roughly arcuate cross-section in a range slightly exceeding N.
(3), the functional shaft strength as a steering rack is increased. Moreover, since the hardened layer is formed locally, there is little distortion due to heat treatment. By hardening with an induction coil that has a substantially flat surface, a hardened layer can be formed locally, there is less heat treatment distortion, and the same induction coil can be used regardless of the diameter of the steering rack.
It is a versatile piece of equipment and is highly efficient as it hardens locally.
本発明を直径−２２（ｍｍ）、長さ−・−６００（ｍｍ
）、山谷数・・・２８、ラック歯のモジュール・・・２
、材質・・・３４５Ｃ材（ＪＩＳ）のステアリングラッ
クに適用した。第２図、第３図は背面部の焼入工程を示
すもので、使用した高周波焼入装置（１６）は、高周波
型ａ（４）と、この高周波型ｍ （４）に接続した導体
（５） （６）と、この導体（５） （６）に接続した
接触電極（７） （８）と、電ｉ （７） （８）の間
に設けた誘導コイル（９）と、ＴＬ極（７） （８）と
の間でステアリングラック（１）を挟持する保持部材（
１０）と、誘導コイル（９）の小孔（１１）から冷媒液
を噴出する冷媒供給装置（１２）とから成る。先ず、予
め高周波焼入れにより歯部焼入硬化Ｎ（２）の形成され
たステアリングラック（１）を、略平坦面を有する誘導
コイル（９）を、その平坦面が、ステアリングラック軸
心（Ｏ）を通り、歯底面（Ｐ１）に垂直な面（Ｐ２）よ
り、車体取付時上側方向に角度θ＝２０＠（Ｉｔいた面
（Ｐ３）と垂直に交わる様に、ステアリングラック背面
部に対面させて配し、図面に示す如く電極（７） （８
）と保持部材（１０）とで挟持固定して、ステアリング
ラック（１）の背面部を所定ｌＡ度加熱する。そして、
この加熱部に誘導コイル（９）の小孔（１１）より冷媒
液を噴射して冷却して背画部焼入硬化層を形成する。The present invention has a diameter of -22 (mm) and a length of -600 (mm).
), Number of peaks and valleys...28, Rack tooth module...2
, Material: Applied to a steering rack made of 345C material (JIS). Figures 2 and 3 show the hardening process of the back surface, and the induction hardening device (16) used consists of a high-frequency type a (4) and a conductor (4) connected to the high-frequency type m (4). 5) (6), the contact electrode (7) (8) connected to this conductor (5) (6), the induction coil (9) provided between the electric i (7) (8), and the TL pole. (7) A holding member (8) that holds the steering rack (1) between
10), and a refrigerant supply device (12) that spouts refrigerant liquid from the small holes (11) of the induction coil (9). First, a steering rack (1), which has been formed with hardened teeth N (2) by induction hardening in advance, is attached to an induction coil (9) having a substantially flat surface, and the flat surface is aligned with the steering rack axis (O). , and face the back of the steering rack so that it intersects perpendicularly with the plane (P3) that was at an angle θ = 20@(It) in the upward direction when installed on the car body from the plane (P2) perpendicular to the tooth bottom plane (P1). electrodes (7) (8) as shown in the drawing.
) and the holding member (10), and heat the back surface of the steering rack (1) to a predetermined 1A degree. and,
A refrigerant liquid is injected into this heating part from the small hole (11) of the induction coil (9) to cool it and form a quenched and hardened layer in the back part.
このことによって、第１図に示す如くステアリングラッ
クの面（Ｐ２）より車体取付時上側方向へ角度θ＝２０
”偏位した面（Ｐ３）を中心として略対称で端部が背面
部中央（Ｑ）に達した背画部焼入硬化層（３）を有する
ステアリングラック（１）が得られる。このステアリン
グラック（１）において、取付角度を１７″とした場合
最大荷重Ｆ１の作用する角度θ＝１３° （操向装置の
取付形状、角度より得られる値）及び断面係数の最小の
方向の角度θ＝２５＠の方向からの耐曲げ荷重を測定し
た結果、背面部に硬化層を形成しないものに比べて１．
５倍以上となりステアリングラックとして８１能上充分
なものであり、熱処理歪も小さいものであった。As a result, as shown in FIG.
``A steering rack (1) having a hardened back layer (3) that is approximately symmetrical about the deflected surface (P3) and whose end reaches the center (Q) of the back surface is obtained.This steering rack In (1), when the mounting angle is 17'', the angle θ at which the maximum load F1 acts = 13° (value obtained from the mounting shape and angle of the steering device) and the angle θ in the direction of the minimum section modulus = 25 As a result of measuring the bending load resistance from the @ direction, it was 1.
The result was more than 5 times that of 81, which was sufficient for use as a steering rack, and the heat treatment distortion was also small.
そして、略平坦面を有する誘導コイル（９）を使用する
ので、電極（７） （８）と保持部材（１０）とを変更
するだけで、径の異なるステアリングラックにも高周波
焼入することが出来るので、設備として汎用性を有し、
局部的な焼入れにより消費電力が少なく効率が良いもの
となる。Since the induction coil (9) with a substantially flat surface is used, steering racks with different diameters can be induction hardened by simply changing the electrodes (7) (8) and the holding member (10). Because it can be used, it has versatility as equipment.
Localized hardening reduces power consumption and improves efficiency.
〔発明の効果〕
本発明は前述の如くであるから、背面部に高周波焼入れ
により焼入硬化層を形成して軸強度を向上し、しかも局
部的な硬化層でありながら、機能上充分なステアリング
ラックを得ることが出来る。そして、局部的に焼入れす
るので熱処理歪が少なく、後の矯正作業を容易なものと
することが出来る。そして、略平坦面を有する誘導コイ
ルを用いることで、設備として汎用性に富むものであり
、局部的な焼入れにより消費電力が少なく、効率の良い
ステアリングラックの高周波焼入れを行うことが出来る
等の効果を有する。[Effects of the Invention] As described above, the present invention improves shaft strength by forming a quenched hardened layer on the back surface by induction hardening, and provides functionally sufficient steering even though the hardened layer is localized. You can get a rack. Since the material is locally quenched, there is less distortion due to heat treatment, and subsequent straightening work can be facilitated. In addition, by using an induction coil with a substantially flat surface, the equipment is highly versatile, and localized hardening reduces power consumption, making it possible to perform high-frequency induction hardening of steering racks. has.
第１図は本発明実施例のステアリングラックの断面図、
第２図は本発明実施例の前面部の焼入工程を示す一部切
欠断面図、第３図は第２図Ａ−Ａ線に沿う断面図、第４
図は従来例のステアリングラックを示す断面図、第５図
は従来例の背面部の焼入工程を示す断面図である。
符号の説明
１・・・ステアリングラック ２・・・歯部焼入硬化層
３・・・背画部焼入硬化層 ９・・・誘導コイル１６・
・・高周波焼入装置FIG. 1 is a sectional view of a steering rack according to an embodiment of the present invention.
FIG. 2 is a partially cutaway sectional view showing the hardening process of the front part of the embodiment of the present invention, FIG. 3 is a sectional view taken along line A-A in FIG. 2, and FIG.
The figure is a cross-sectional view showing a conventional steering rack, and FIG. 5 is a cross-sectional view showing a hardening process of the back surface of the conventional example. Explanation of symbols 1... Steering rack 2... Quenched and hardened layer of tooth portion 3... Quenched and hardened layer of back portion 9... Induction coil 16.
・・Induction hardening equipment
Claims (2)
ックの前記歯部と背面部とに高周波焼入れによる焼入硬
化層を形成したステアリングラックにおいて、前記背面
部に形成した背面部焼入硬化層を、ステアリングラック
軸心（Ｏ）を通り、歯底面（Ｐ１）に垂直な面（Ｐ２）
より、車体取付時の上側方向に角度θが１５°乃至３０
°傾いた面（Ｐ３）を中心として左右略対称に、且一方
の端部が前記面（Ｐ２）と背面部との交点（Ｑ）を僅か
に超える範囲の断面略弓形に形成したことを特徴とする
ステアリングラック。(1) In a steering rack in which a quench-hardened layer is formed by induction hardening on the teeth and the back surface of a steering rack in which a tooth section is provided in a chord shape on a circular cross-sectional shaft, the back surface section formed on the back surface is quenched. The hardened layer is passed through the steering rack axis (O) and perpendicular to the tooth bottom surface (P1) (P2).
Therefore, the angle θ is 15° to 30° in the upward direction when attached to the vehicle body.
°It is characterized by being approximately symmetrical left and right with the inclined surface (P3) as the center, and one end having an approximately arcuate cross-section extending slightly beyond the intersection (Q) of the surface (P2) and the back surface. and steering rack.
ックの前記歯部の背面部に高周波焼入れによる焼入硬化
層を形成するステアリングラックの高周波焼入方法にお
いて、略平坦面を有する誘導コイルを、その略平坦面を
、ステアリングラック軸心（Ｏ）を通り、歯底面（Ｐ１
）に垂直な面（Ｐ２）より、車体取付時の上側方向に角
度θが１５°乃至３０°傾いた面（Ｐ３）に垂直にステ
アリングラック背面部に対面させて配し、ステアリング
ラックの背面部を誘導コイルを流れる高周波電流により
所定温度に加熱し、この背面部に冷媒液を噴射して該背
面部に焼入硬化層を形成することを特徴とするステアリ
ングラックの高周波焼入方法。(2) In an induction hardening method for a steering rack in which a quenched hardened layer is formed by induction hardening on the back surface of the teeth of a steering rack in which teeth are provided in a chord shape on a circular cross-sectional axis, a guide having a substantially flat surface is used. The substantially flat surface of the coil passes through the steering rack axis (O), and the tooth bottom surface (P1
), facing the rear surface of the steering rack perpendicular to a surface (P3) that is tilted upward at an angle θ of 15° to 30° when mounted on the vehicle body, from a surface (P2) perpendicular to the rear surface of the steering rack. What is claimed is: 1. A method for induction hardening a steering rack, comprising: heating the steering rack to a predetermined temperature by a high frequency current flowing through an induction coil, and injecting a refrigerant liquid onto the back surface of the steering rack to form a hardened layer on the back surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2090086A JPS62178472A (en) | 1986-01-31 | 1986-01-31 | Steering rack and high frequency hardening therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2090086A JPS62178472A (en) | 1986-01-31 | 1986-01-31 | Steering rack and high frequency hardening therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62178472A true JPS62178472A (en) | 1987-08-05 |
| JPH0583432B2 JPH0583432B2 (en) | 1993-11-26 |
Family
ID=12040104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2090086A Granted JPS62178472A (en) | 1986-01-31 | 1986-01-31 | Steering rack and high frequency hardening therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62178472A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007505789A (en) * | 2003-09-23 | 2007-03-15 | ビショップ イノヴェーション リミテッド | Compound steering rack |
| US7662245B2 (en) | 2003-05-27 | 2010-02-16 | Koyo Seiko Co., Ltd. | Steering rack comprising steel bar with rack teeth |
-
1986
- 1986-01-31 JP JP2090086A patent/JPS62178472A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7662245B2 (en) | 2003-05-27 | 2010-02-16 | Koyo Seiko Co., Ltd. | Steering rack comprising steel bar with rack teeth |
| JP2007505789A (en) * | 2003-09-23 | 2007-03-15 | ビショップ イノヴェーション リミテッド | Compound steering rack |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0583432B2 (en) | 1993-11-26 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |