JPS58170268U

JPS58170268U - Rack type power steering device

Info

Publication number: JPS58170268U
Application number: JP6792282U
Authority: JP
Inventors: 恵樋口
Original assignee: 日産自動車株式会社
Priority date: 1982-05-10
Filing date: 1982-05-10
Publication date: 1983-11-14
Also published as: JPH0129182Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来のラック式パワーステアリング装置を示す
正面断面図、第２図はステアリングホイールの回転角と
ギヤ比との関係を示すグラフ、第３図はこの考案による
ラック式パワーステアリング装置の一実施例を示す正面
断面図ミ□第４図は第３図の浮動式ピストン付近の拡大
図、第５図は第　　−４図のシールリング付近の拡大図
、第６図は第５図で示したシールリングの斜視図、第７
図は第５図のシールリングの拡開した状態を示す正面断
面図、第８図は必要なアシスト力を得るのに要求される
作動油の油圧とステアリングホイールの回転角の関係を
示すグラフ、第９図はシールリングの他の例を示す斜視
図である。１５・・・シリンダ、１８・・・小径部、１９・・・大
径部、２０・・・ラック軸、２６−・・ラーツク部（ラ
ック）、２７・・・ピニオン、２８・・・油圧コントロ
ール機構、２９・・・軸部、３７・・・ピストン、３９
．４７・・・シールリング、４５・・・第１油圧室、４
６・・・第２油圧室。屑ｌ　　　　　　　　　ｃスゴ７シンラｌ伺し４ａ庫番＾Fig. 1 is a front sectional view showing a conventional rack-type power steering device, Fig. 2 is a graph showing the relationship between the rotation angle of the steering wheel and the gear ratio, and Fig. 3 is a diagram showing a rack-type power steering device according to this invention. Front cross-sectional view showing the embodiment □Figure 4 is an enlarged view of the vicinity of the floating piston in Figure 3, Figure 5 is an enlarged view of the vicinity of the seal ring in Figure -4, and Figure 6 is shown in Figure 5. Perspective view of the seal ring, No. 7
The figure is a front sectional view showing the expanded state of the seal ring shown in Fig. 5, and Fig. 8 is a graph showing the relationship between the hydraulic pressure of the hydraulic oil required to obtain the necessary assist force and the rotation angle of the steering wheel. FIG. 9 is a perspective view showing another example of the seal ring. 15... Cylinder, 18... Small diameter part, 19... Large diameter part, 20... Rack shaft, 26... Rack part (rack), 27... Pinion, 28... Hydraulic control Mechanism, 29... Shaft part, 37... Piston, 39
．． 47... Seal ring, 45... First hydraulic chamber, 4
6...Second hydraulic chamber. Scrap l c Sugo 7 Shinra l visit 4a storage number ^

Claims

[Scope of utility model registration request]

A pinion connected to the cylinder and the steering wheel via a hydraulic control mechanism, a rack i having a rack part that meshes with the pinion and a shaft part that runs loosely through the cylinder, and a hydraulic control mechanism fixed to the shaft part together with the cylinder. A rack-type power steering device comprising a piston defining a first hydraulic chamber and a second hydraulic chamber that can communicate with each other, and in which the steering wheel is in a straight-ahead position and the piston is in a neutral position in a cylinder at some times, The cylinder is provided with a small diameter part near the neutral position of the piston and a large diameter part on both sides of the small diameter part, and the piston has a seal ring that can expand and contract in its radial direction, and this seal ring changes as the inner diameter of the cylinder changes. This rack-type power steering device is characterized by being able to expand and contract and fit tightly against the inner wall of the cylinder.