JPS6157278U

JPS6157278U -

Info

Publication number: JPS6157278U
Application number: JP14152484U
Authority: JP
Priority date: 1984-09-20
Filing date: 1984-09-20
Publication date: 1986-04-17
Also published as: JPH0320614Y2

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す縦断面図、第
２図と第３図は本考案のリリーフ弁の適用例を示
すポンプの側面図と正面図、第４図と第５図は従
来のパイロツトリリーフ弁の適用例を示すポンプ
の側面図と正面図、第６図はこれら適用例として
のポンプの比例電磁式ロードセンシング制御弁シ
ステムの油圧回路図である。１９：安全弁付比例電磁式パイロツトリリーフ
弁、２１：弁ボデイ、２３：弁孔、２５：貫通孔
、２７：第１の弁座、２９：電磁ソレノイド装置
、３３：可動鉄心、３５：励磁コイル、４５：ば
ね、４７：第２の弁体、４９：圧力制御部、５３
：タンクポート、５５：油室、５９：圧力ポート
、６３：安全弁、６７：弁座部材、６９：ばね、
７１：弁体、７３：ねじ部材。 Fig. 1 is a vertical sectional view showing an embodiment of the present invention, Figs. 2 and 3 are side and front views of a pump showing an example of application of the relief valve of the present invention, and Figs. 4 and 5 are A side view and a front view of a pump showing examples of application of a conventional pilot relief valve, and FIG. 6 is a hydraulic circuit diagram of a proportional electromagnetic load sensing control valve system for a pump as an example of these applications. 19: Proportional electromagnetic pilot relief valve with safety valve, 21: Valve body, 23: Valve hole, 25: Through hole, 27: First valve seat, 29: Electromagnetic solenoid device, 33: Movable iron core, 35: Excitation coil, 45: Spring, 47: Second valve body, 49: Pressure control section, 53
: Tank port, 55: Oil chamber, 59: Pressure port, 63: Safety valve, 67: Valve seat member, 69: Spring,
71: Valve body, 73: Screw member.

Claims

[Claims for Utility Model Registration] A first valve member having a through hole disposed at one end of a valve hole extending through the valve body and extending along the axial direction of the valve hole, and an attractive force characteristic proportional to the excitation current. an electromagnetic solenoid device having: an electromagnetic solenoid device attached to the other end side of the valve hole;
and a second valve member pressed against the first valve member within the valve hole by an electromagnetic solenoid device via a spring to form a pressure control portion between the through hole and the inside of the valve hole.
a valve member, with the inside of the through hole serving as a pressure port;
In a proportional electromagnetic pilot relief valve having a valve hole communicating with a tank port, a cover member is attached to the valve body so as to form an oil chamber communicating with the through hole at the one end of the valve hole; A safety valve is built into the cover member to communicate the oil chamber with a tank port when the pressure oil in the oil chamber exceeds a predetermined set pressure, thereby keeping the pressure value in the oil chamber below a set value. A proportional solenoid pilot relief valve characterized by: