JPS6299261A - Rack shaft in rack and pinion steering device and manufacture thereof - Google Patents
Rack shaft in rack and pinion steering device and manufacture thereofInfo
- Publication number
- JPS6299261A JPS6299261A JP23870685A JP23870685A JPS6299261A JP S6299261 A JPS6299261 A JP S6299261A JP 23870685 A JP23870685 A JP 23870685A JP 23870685 A JP23870685 A JP 23870685A JP S6299261 A JPS6299261 A JP S6299261A
- Authority
- JP
- Japan
- Prior art keywords
- rack
- shaft
- auxiliary member
- rack shaft
- hollow 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.)
- Pending
Links
Landscapes
- Gears, Cams (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明はラック軸に係り、特に両端部側を連通ずる内部
通路が形成されているラックピニオン式舵取装置のラッ
ク軸に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rack shaft, and more particularly to a rack shaft for a rack and pinion type steering device in which an internal passage communicating with both ends is formed.
［従来の技術］
ラックピニオン式舵取装置では、操舵ハンドルに連動す
るピニオンとこのピニオンに噛み合うラック軸とをギア
ケースに収納し、ラックセ（屡の両端にそれぞれ操向車
輪に連結されるリンクを取付 □けているが、ギアケ
ース内に雨水、塵埃等が侵入するのを防止するため、ギ
アケースの両端にその近傍を覆うダストカバーを装着し
ている。[Prior Art] In a rack and pinion type steering device, a pinion that is linked to a steering wheel and a rack shaft that meshes with the pinion are housed in a gear case, and links connected to the steering wheels are installed at both ends of the rack shaft. Installation □In order to prevent rainwater, dust, etc. from entering the gear case, dust covers are installed at both ends of the gear case to cover the vicinity thereof.
このようなラックピニオン式舵取装置においては、ラッ
ク軸の移動によって生ずるダストカバー内の空気の増減
を、ラック軸の両端部側を連通する通気孔を設けること
により防止しなければならない。In such a rack and pinion type steering device, it is necessary to prevent air from increasing or decreasing in the dust cover due to movement of the rack shaft by providing ventilation holes communicating with both ends of the rack shaft.
そこで従来は、両端のベローズに穴をあけ、これらの穴
をビニールパイプで連結して通気を行なう方法、あるい
は、ラー２り軸内に穴をあけて通気を行なう方法（実開
昭５５−９５９Ｈ号公報）等がとられていた。Therefore, the conventional methods were to make holes in the bellows at both ends and connect these holes with a vinyl pipe to provide ventilation, or to make a hole in the shaft of the roller 2 (Utility Model Publication No. 55-959H). Publication No.) etc. were taken.
［発明が解決しようとする問題点］
１ユ記のような従来のラックピニオン式舵取装置では、
ラック軸の内部に通気穴を穿設することが困難であり、
また、ビニールパイプ等の余分な部品を必要とする等い
ずれの装置も欠点を有していた。[Problems to be solved by the invention] In the conventional rack and pinion type steering device as described in Section 1,
It is difficult to drill ventilation holes inside the rack shaft,
Additionally, both devices had drawbacks, such as requiring extra parts such as vinyl pipes.
本発明はこのような欠点を除くためになされたもので、
ラック軸の内部に通気穴を穿設する必要がなく、少ない
工程でかつ低コストで製造することができるラック軸お
よびその製造方法を提供することを目的とする。The present invention has been made to eliminate such drawbacks.
It is an object of the present invention to provide a rack shaft and a method for manufacturing the rack shaft that can be manufactured with fewer steps and at low cost without the need to drill ventilation holes inside the rack shaft.
［問題点を解決するための手段］
本発明に係るう・ンク軸は、中空軸の内部に補助部材が
挿入されこの部分の中空軸外面にラック歯が形成され、
さらに、中空軸の内面または補助部材の外面に軸方向に
延びる溝が形成されたものである。また、本発明に係る
製造方法は、中空軸の内面または補助部材の外面に軸方
向溝を形成した後、補助部材を中空軸内に挿入し、その
後中空軸の外面にラック歯を形成するものである。[Means for Solving the Problems] In the drive shaft according to the present invention, an auxiliary member is inserted into the hollow shaft, and rack teeth are formed on the outer surface of the hollow shaft in this part,
Furthermore, a groove extending in the axial direction is formed on the inner surface of the hollow shaft or the outer surface of the auxiliary member. Furthermore, the manufacturing method according to the present invention includes forming an axial groove on the inner surface of the hollow shaft or the outer surface of the auxiliary member, inserting the auxiliary member into the hollow shaft, and then forming rack teeth on the outer surface of the hollow shaft. It is.
［作用］
本発明に係るラック軸は、中空軸または補助部材に形成
された溝によって、ラック軸の両端を連通ずる通気孔が
構成されている。また、本発明方法では、特別の加工を
必要とせず、ラック軸の両端を連通ずる通気孔が得られ
る。[Function] In the rack shaft according to the present invention, a ventilation hole that communicates both ends of the rack shaft is formed by a groove formed in the hollow shaft or the auxiliary member. In addition, the method of the present invention provides ventilation holes that communicate with both ends of the rack shaft without requiring any special processing.
［実施例コ
以下図示実施例により本発明を説明する。第１図は本発
明の一実施例に係るラック軸（２）を適用したラックピ
ニオン式舵取装置を示すものであり、ギアケース（４）
内にラック軸（２）が摺動自在に支持され、このラック
軸（２）に形成されたラック歯（６）には、図示しない
舵取ハンドルに連動して回転するビニオン（８）が噛み
合っている。また、ギアケース（４）には、ラック軸（
２）のラック歯（６）が形成された部分の背面（１０）
側に向けて貫通する孔（１２）が形成され、この孔（１
２）内に筒状部材（１４）が摺動自在に配置されている
。この筒状部材（１４）は裏面側に配設されたばね（１
６）によってう・ンク輛（２）の背面に弾接し、ラック
軸（２）をビニオン（８）側へ付勢している。[Examples] The present invention will be explained below with reference to illustrated examples. FIG. 1 shows a rack and pinion type steering device to which a rack shaft (2) according to an embodiment of the present invention is applied, and a gear case (4)
A rack shaft (2) is slidably supported therein, and a binion (8) that rotates in conjunction with a steering handle (not shown) meshes with rack teeth (6) formed on the rack shaft (2). ing. In addition, the gear case (4) has a rack shaft (
2) Back side (10) of the part where the rack teeth (6) are formed
A hole (12) penetrating toward the side is formed, and this hole (1
2) A cylindrical member (14) is slidably disposed within. This cylindrical member (14) has a spring (1) disposed on the back side.
6) makes elastic contact with the rear surface of the rack shaft (2) and urges the rack shaft (2) toward the binion (8).
ラック軸（２）は、中空軸（１８）から成形され、その
穴（２０）内の上記ランク歯（６）が形成された部分に
は、この穴（２０）の内径と略同径の補助部材（２２）
が挿入されている。この補助部材（２２）のラック軸（
２）背面（１０）側には、軸方向に延びる溝（２４）が
形成され、補助部材（２２）の両端面間を連通している
。この溝（２４）によって、ギアケース（４）の両端に
設けられたダストカバー（図示ぜず）内の空気が互に連
通ずるようになっており、ラック軸（２）の移動により
生ずるダストカバー内の空気の増減を防止することがで
きる。The rack shaft (2) is formed from a hollow shaft (18), and the portion of the hole (20) where the rank teeth (6) are formed has an auxiliary shaft having approximately the same diameter as the inside diameter of the hole (20). Component (22)
has been inserted. The rack shaft of this auxiliary member (22) (
2) A groove (24) extending in the axial direction is formed on the back surface (10) side, and communicates between both end surfaces of the auxiliary member (22). This groove (24) allows the air in the dust covers (not shown) provided at both ends of the gear case (4) to communicate with each other, and prevents the dust cover caused by the movement of the rack shaft (2). It is possible to prevent the air inside from increasing or decreasing.
なお、補助部材（２２）の溝（２４）の断面形状は、第
２図（ａ） 、 （ｂ） 、 （ｃ）に示す如く、三角
形状に切欠いたもの（２４ａ）、四角形状に切欠いたも
の（２４ｂ）、モ面（２４ｃ）としたもの等の他補助部
材（２２）の両端面を連通しうるものであれば、どのよ
うな形状であっても良い。The cross-sectional shape of the groove (24) of the auxiliary member (22) is as shown in FIGS. 2(a), (b), and (c). The auxiliary member (22) may have any shape as long as it can communicate with both end faces of the auxiliary member (22), such as a straight face (24b) or a square face (24c).
次に、北記うフク軸（２）の製造方法について説明する
。ラック軸（２）の素材（２６）は、第３図に示すよう
に、軸芯部に穴（２ｏ）を有する中空軸であり、まずこ
の素材（２６）の穴（２ｏ）内に断面三角形状の軸方向
溝（２４）が設けられた補助部材（２２）を挿入する。Next, a method of manufacturing the hook shaft (2) described above will be explained. As shown in Fig. 3, the material (26) of the rack shaft (2) is a hollow shaft with a hole (2o) in the shaft core. Insert an auxiliary member (22) provided with a shaped axial groove (24).
補助部材（２２）の外径は素材（２６）の穴（２ｏ）の
内径にほぼ等しく、これら両者（２２）、（２６）はろ
う付は等により接着されまたは圧力ばめ、焼ばめ等によ
って一体化されている。The outer diameter of the auxiliary member (22) is approximately equal to the inner diameter of the hole (2o) in the material (26), and these two (22) and (26) are bonded together by brazing, pressure fitting, shrink fitting, etc. is integrated by.
次いで、熱間鍛造、温間鍛造、冷間鍛造あるいは転造加
工などの塑性加工によりラック（！Ｉ（８）の成形を行
なう。例えば、第４図に示す如く、ラック歯（６）を成
形するための歯型部（２８）を有する下型（３０）と、
素材（２６）の外周面とほぼ一致した形状の四部（３２
）を有する上型（３４）とにより鍛造加工を行なう。こ
の塑性加工の後、必要な仕上げ加二り等を行ない第５図
に示すようなラック軸（２）が完成する。Next, the rack (!I(8)) is formed by plastic working such as hot forging, warm forging, cold forging, or rolling. For example, as shown in FIG. 4, the rack teeth (6) are formed. a lower mold (30) having a tooth mold part (28) for
The four parts (32
) The forging process is performed using an upper die (34) having a After this plastic working, necessary finishing operations are performed to complete the rack shaft (2) as shown in FIG.
このように中空の素材（２６）の穴（２０）内に、軸方
向溝（２４）を有する補助部材（２２）を挿入した後ラ
ック歯（６）を成形すれば、ラック軸（２）の両端側を
連通ずる通気孔を容易に得ることかできる。In this way, if the auxiliary member (22) having the axial groove (24) is inserted into the hole (20) of the hollow material (26) and the rack teeth (6) are formed, the rack shaft (2) can be formed. A ventilation hole that communicates both ends can be easily obtained.
なお、鍛造によってラック軸を成形する場合は、溝内に
予め砂、粉末、グリース等の流動体もしくは鉛のような
低温により溶融する物質等を封入しておき、ラック歯を
成形した後除去するようにしても良い、また、補助部材
に設ける溝は上述の如きラック歯の背面側に設けたもの
に限定されるものではないが、背面側のほうが鍛造の際
に材料の流動性が悪いため、通気孔を確保するために好
ましい、さらに、補助部材は中空軸よりも硬く流動性の
悪い材質のほうが通気孔を確保するうえで有利である。When forming the rack shaft by forging, a fluid such as sand, powder, or grease or a substance that melts at low temperatures such as lead is filled in the groove in advance and removed after the rack teeth are formed. In addition, the grooves provided in the auxiliary member are not limited to those provided on the back side of the rack teeth as described above, but since the flowability of the material during forging is worse on the back side, In order to secure the ventilation hole, it is preferable.Furthermore, it is advantageous for the auxiliary member to be made of a material that is harder and has poor fluidity than the hollow shaft.
第６図（ａ） 、 （ｂ） 、 （ｃ）は他の実施例を
示すものであり、」二足実施例と異なる点は、補助部材
（２２）の外面側ではなく、この補助部材（２２）に接
する中空軸（１８）の内面に軸方向溝（３８ａ） 、
（３６ｂ） 、 （３Ｅｉｃ）を形成したものである。FIGS. 6(a), (b), and (c) show other embodiments, and the difference from the two-legged embodiment is not in the outer surface of the auxiliary member (22) but in the outer surface of the auxiliary member (22). 22), an axial groove (38a) on the inner surface of the hollow shaft (18),
(36b) and (3Eic) were formed.
この場合にも、ラックピニオン式舵取装置のギアケース
両端に設けられたダストカバー間を互に連通ずる通気孔
を確保することができ、また上記実施例の場合と同様に
製造も容易である。In this case as well, it is possible to ensure ventilation holes that communicate with each other between the dust covers provided at both ends of the gear case of the rack and pinion type steering device, and manufacturing is also easy as in the case of the above embodiment. .
［発明の効果］
以、ｆ：述べたように、未発明に係るラック軸は、その
両端を連通ずる通気孔を確保して、両ダストカバー内の
空気の増減を防止することができる。[Effects of the Invention] Hereinafter, f: As described above, the rack shaft according to the uninvented invention can prevent the air from increasing or decreasing in both dust covers by ensuring a ventilation hole that communicates both ends thereof.
また本発明方法によれば、通気孔の加工を別個に行なう
必要がなく、工数を削減しコストを低減することができ
る。Further, according to the method of the present invention, there is no need to separately process the ventilation holes, and the number of steps and costs can be reduced.
第１図は本発明の一実施例に係るラック軸を適用したラ
ックピニオン式舵取装置の縦断面図、第２図（ａ）、（
ｂ）、（Ｃ）はラー２り軸のそれぞれ異なる例を示す横
断面図、第３図〜第５図は製造方法の一例を示す図であ
り、第３図はラック軸の素材と補助部材を示す斜視図、
第４図は鍛造工程を示す斜視図、第５図は完成したラッ
ク軸を示す斜視図、第６図（ａ）、（ｂ）、（Ｃ）はそ
れぞれ他の実施例に係るラック軸を示す横断面図である
。
（２）・・・ラックＭ （８） −・・ラック
歯（１８）・・・中空軸 （２２）・・・補助
部材（２４）、 （２４ａ）、 （２４ｂ） 、 （２
４ｃ） 、 （３８ａ）、 （３１３ｂ） 、 （３８
ｃ）−＝溝特許出願人 自動車機奏株式会社代
理人 弁理士 山 崎 宗 核間
相 川 守同
大 塚 栄 吉第３図
溶４図
第５図FIG. 1 is a longitudinal sectional view of a rack and pinion type steering device to which a rack shaft according to an embodiment of the present invention is applied, and FIG.
b) and (C) are cross-sectional views showing different examples of the rack shaft, Figures 3 to 5 are diagrams showing an example of the manufacturing method, and Figure 3 shows the material and auxiliary members of the rack shaft. A perspective view showing
Fig. 4 is a perspective view showing the forging process, Fig. 5 is a perspective view showing a completed rack shaft, and Figs. 6 (a), (b), and (C) show rack shafts according to other embodiments. FIG. (2)... Rack M (8) -... Rack tooth (18)... Hollow shaft (22)... Auxiliary member (24), (24a), (24b), (2
4c), (38a), (313b), (38
c) - = Mizo Patent applicant Jidosha Kiso Co., Ltd. Agent Patent attorney Sou Yamazaki Nukanuma
Morito Aikawa
Eikichi Otsuka Figure 3 Figure 4 Figure 5
Claims (2)
材が挿入された部分の中空軸外面にラック歯が形成され
たラック軸において、上記中空軸の内面または補助部材
の外面に軸方向に延びる溝が形成され、この溝が補助部
材の挿入された部分の両側を連通する通気孔を構成して
いることを特徴とするラックピニオン式舵取装置のラッ
ク軸。(1) In a rack shaft in which an auxiliary member is inserted into the hollow shaft, and rack teeth are formed on the outer surface of the hollow shaft at the portion where the auxiliary member is inserted, the inner surface of the hollow shaft or the outer surface of the auxiliary member is axially 1. A rack shaft for a rack and pinion type steering device, characterized in that a groove is formed extending into the shaft, and the groove constitutes a ventilation hole that communicates with both sides of a portion into which an auxiliary member is inserted.
びる溝を形成した後、この補助部材を中空軸の穴内に挿
入し、その後補助部材の挿入された部分の中空軸外面に
ラック歯を形成することを特徴とするラックピニオン式
舵取装置のラック軸を製造する方法。(2) After forming a groove extending in the axial direction on the inner surface of the hollow shaft or the outer surface of the auxiliary member, insert this auxiliary member into the hole of the hollow shaft, and then provide the rack teeth on the outer surface of the hollow shaft in the part where the auxiliary member was inserted. 1. A method of manufacturing a rack shaft for a rack and pinion steering device, the method comprising: forming a rack shaft for a rack and pinion steering device;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23870685A JPS6299261A (en) | 1985-10-25 | 1985-10-25 | Rack shaft in rack and pinion steering device and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23870685A JPS6299261A (en) | 1985-10-25 | 1985-10-25 | Rack shaft in rack and pinion steering device and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6299261A true JPS6299261A (en) | 1987-05-08 |
Family
ID=17034068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23870685A Pending JPS6299261A (en) | 1985-10-25 | 1985-10-25 | Rack shaft in rack and pinion steering device and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6299261A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5890394A (en) * | 1996-11-08 | 1999-04-06 | Ford Motor Company | Hollow steering gear rack with integral air grooves |
| US7950153B2 (en) | 2005-03-23 | 2011-05-31 | Bishop Innovation Limited | Method of manufacturing a steering rack |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57195960A (en) * | 1981-05-27 | 1982-12-01 | Jidosha Kiki Co Ltd | Rack shaft and its manufacturing method |
| JPS58218339A (en) * | 1982-06-11 | 1983-12-19 | Daido Steel Co Ltd | Steering rod for vehicle and its manufacture |
-
1985
- 1985-10-25 JP JP23870685A patent/JPS6299261A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57195960A (en) * | 1981-05-27 | 1982-12-01 | Jidosha Kiki Co Ltd | Rack shaft and its manufacturing method |
| JPS58218339A (en) * | 1982-06-11 | 1983-12-19 | Daido Steel Co Ltd | Steering rod for vehicle and its manufacture |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5890394A (en) * | 1996-11-08 | 1999-04-06 | Ford Motor Company | Hollow steering gear rack with integral air grooves |
| US7950153B2 (en) | 2005-03-23 | 2011-05-31 | Bishop Innovation Limited | Method of manufacturing a steering rack |
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