JPS5627089A - Oil hydraulic pump - Google Patents

Oil hydraulic pump

Info

Publication number
JPS5627089A
JPS5627089A JP11643879A JP11643879A JPS5627089A JP S5627089 A JPS5627089 A JP S5627089A JP 11643879 A JP11643879 A JP 11643879A JP 11643879 A JP11643879 A JP 11643879A JP S5627089 A JPS5627089 A JP S5627089A
Authority
JP
Japan
Prior art keywords
oil
plunger
pressure
front chamber
oil tank
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
Application number
JP11643879A
Other languages
Japanese (ja)
Inventor
Susumu Sasaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Kiden Kogyo Ltd
Nittoh Zohki Co Ltd
Original Assignee
Hitachi Kiden Kogyo Ltd
Nittoh Zohki Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Kiden Kogyo Ltd, Nittoh Zohki Co Ltd filed Critical Hitachi Kiden Kogyo Ltd
Priority to JP11643879A priority Critical patent/JPS5627089A/en
Publication of JPS5627089A publication Critical patent/JPS5627089A/en
Pending legal-status Critical Current

Links

Landscapes

  • Details Of Reciprocating Pumps (AREA)

Abstract

PURPOSE: To permit a compact plunger-type oil hydraulic pump for a cutting tool or the like to produce a high pressure by providing a cylinder divided into two by means of a valve in the oil tank tightly filled with oil, omitting a suction valve, and making the ratio of the high-pressure chamber volume to the dilivery smaller.
CONSTITUTION: The pump is operated by the reciprocation of a plunger 9 in the front chamber A of a cylinder 10 by the drive of a motor 3 through a cam 7 on the eccentric portion of a driving shaft 4. When the plunger 9 is moved backward by the force of a spring 8, a negative pressure is applied in the front chamber A because a valve seat 11 has been closed by a switching valve 14. Consequently, when the plunger 9 opens a suction port 12, operating oil filling an oil tank 1 enclosed is sucked into the front chamber A. When the plunger 9 changes its motion to the discharge stroke, the operating oil in the front chamber A flows into the rear chamber B against the force of a spring 13, and is discharged from a discharge port 15. When the quantity of the oil in the oil tank 1 decreases, the pressure in the tank 1 lowers, and this causes a flexible bag 25 opened in the atmosphere to expand. Consequently, the pressure in the oil tank 1 is kept equal to the atmospheric pressure, and so the pump smoothly operates without lowering its function.
COPYRIGHT: (C)1981,JPO&Japio
JP11643879A 1979-09-10 1979-09-10 Oil hydraulic pump Pending JPS5627089A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11643879A JPS5627089A (en) 1979-09-10 1979-09-10 Oil hydraulic pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11643879A JPS5627089A (en) 1979-09-10 1979-09-10 Oil hydraulic pump

Publications (1)

Publication Number Publication Date
JPS5627089A true JPS5627089A (en) 1981-03-16

Family

ID=14687103

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11643879A Pending JPS5627089A (en) 1979-09-10 1979-09-10 Oil hydraulic pump

Country Status (1)

Country Link
JP (1) JPS5627089A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61105772U (en) * 1984-12-17 1986-07-04

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61105772U (en) * 1984-12-17 1986-07-04

Similar Documents

Publication Publication Date Title
US4551076A (en) Fluid driven pump with one-way valve in fluid inlet
US4776771A (en) Metering pump
GB1498224A (en) Apparatus for accumulating liquid pulses and for developing an elevated liquid pressure for subsequent release to the exterior
GR3021021T3 (en) Pump for viscous material
CA2251105A1 (en) Reciprocating liquid pump with disc check valve
CA2244849A1 (en) Manually operated fluid dispensing pump
EP0283026A3 (en) Method and device for starting an hydraulic membrane pump against a load
GB1531478A (en) Hydraulic pumping apparatus
JPS5692381A (en) Air compressor
GB2278891A (en) Flap valve assembly for trigger sprayer
AU4229497A (en) Vacuum actuated replenishing water gun
JPS5627089A (en) Oil hydraulic pump
JPS56146081A (en) Fluid pump
CA2041511A1 (en) Dual-acting, reciprocating piston pump
JPS56160242A (en) Antiskid braking device for automobile
GB2040361A (en) Double-acting vacuum pump
GB1462873A (en) Hydraulic pump
US6190143B1 (en) Piston pump with zero to negative clearance valve
US5167495A (en) Reciprocating hydraulic pump
JPS5618081A (en) Hydraulic pump
CN117231462B (en) Plunger pressure plate pump and working method thereof
GB1323817A (en) Centrifugal pumps
JPS57102578A (en) Reciprocating pump
JPH0733821B2 (en) Hydraulic drive
JP2676110B2 (en) Fluid pressure continuously operated reciprocating actuator