JPH0478076U

JPH0478076U -

Info

Publication number: JPH0478076U
Application number: JP12127090U
Authority: JP
Priority date: 1990-11-21
Filing date: 1990-11-21
Publication date: 1992-07-08
Anticipated expiration: 2005-11-21
Also published as: JP2526636Y2

Description

[Brief explanation of the drawing]

第１図は本願の第１考案に係るパワーステアリ
ング装置用流量制御機構の一実施例を備えたパワ
ーステアリング用オイルポンプの縦断面図、第２
図は第１図の−線断面図、第３図は第２図の
部分拡大図、第４図は第１図の−線断面図、
第５図は第４図の−線断面図、第６図は本願
の第２考案に係るパワーステアリング装置用制御
機構の一実施例の構成を示す分解斜視図、第７図
はそのサブスプール部の断面図、第８図は本考案
のパワーステアリング装置用流量制御機構による
ポンプ回転数と数量の関係を示した線図である。１０……オイルポンプ、１８……ポンプユニツ
ト（ベーンポンプ機構）、２０……フロントサイ
ドプレート、３４……カートリツジ吐出口（ベー
ンポンプ機構の吐出口）、５２……オイルポンプ
吐出口、５４……第１連通路、５６……オリフイ
ス、６０……スプール、６８……第２連通路、７
２……サブスプール、７８……圧力導入通路（ダ
ンパオリフイス）、８０……プラグ、９２……サ
ブスプール、９６……中心孔（第１吐出通路）、
９８……第２吐出通路、１００……固定オリフイ
ス。 FIG. 1 is a vertical cross-sectional view of a power steering oil pump equipped with an embodiment of a flow rate control mechanism for a power steering device according to the first invention of the present application;
The figure is a - line sectional view of Fig. 1, Fig. 3 is a partially enlarged view of Fig. 2, and Fig. 4 is a - line sectional view of Fig. 1.
5 is a sectional view taken along the line -- in FIG. 4, FIG. 6 is an exploded perspective view showing the configuration of an embodiment of a control mechanism for a power steering device according to the second invention of the present application, and FIG. 7 is a sub-spool portion thereof. FIG. 8 is a diagram showing the relationship between pump rotation speed and quantity according to the flow rate control mechanism for a power steering device according to the present invention. DESCRIPTION OF SYMBOLS 10... Oil pump, 18... Pump unit (vane pump mechanism), 20... Front side plate, 34... Cartridge discharge port (discharge port of vane pump mechanism), 52... Oil pump discharge port, 54... First Communication path, 56... Orifice, 60... Spool, 68... Second communication path, 7
2... Sub-spool, 78... Pressure introduction passage (damper orifice), 80... Plug, 92... Sub-spool, 96... Center hole (first discharge passage),
98...Second discharge passage, 100...Fixed orifice.

Claims

[Claims for Utility Model Registration] (1) A flow rate control mechanism for a power steering device that controls the discharge flow rate of an oil pump including a vane pump mechanism, wherein a discharge port of the vane pump mechanism and a discharge port of the oil pump are communicated with each other. a first discharge passage having a first communication passage in which an orifice is interposed; a spool valve that maintains a differential pressure on both sides of the orifice at a constant value; a second discharge passage having a second communication passage communicating between the discharge opening of the mechanism and the discharge opening of the oil pump; and a sub-spool that moves in the direction of closing the second communication passage as the vane back pressure of the vane pump mechanism introduced through the damper orifice increases with the increase in pump rotational speed. A flow control mechanism for a power steering device, characterized by: (2) The power steering device according to claim (1), wherein the damper orifice is constituted by a plug made of a material with a large coefficient of thermal expansion and fitted into a side plate of the vane pump mechanism. Flow control mechanism. (3) A flow rate control mechanism for a power steering device that controls the discharge flow rate of an oil pump including a vane pump mechanism, wherein an orifice is provided to communicate a discharge port of the vane pump mechanism and a discharge port of the oil pump. a first discharge passage having a first communication passage; a spool valve that maintains the differential pressure on both sides of the orifice at a constant value; a second discharge passage that communicates with the discharge port of the vane pump mechanism; a fixed orifice that throttles the discharge pressure of the vane pump mechanism; and a center hole that forms a part of the first discharge passage; It is biased in the direction of opening the passage, and is actuated by the differential pressure between the throttled pressure of the fixed orifice and the discharge pressure of the first discharge passage, and as this differential pressure increases with the increase in pump rotational speed, the A flow control mechanism for a power steering device, comprising: a sub-spool that moves in a direction to close a second discharge passage.