JPS57210181A - Oil hydraulic pump - Google Patents

Oil hydraulic pump

Info

Publication number
JPS57210181A
JPS57210181A JP56094582A JP9458281A JPS57210181A JP S57210181 A JPS57210181 A JP S57210181A JP 56094582 A JP56094582 A JP 56094582A JP 9458281 A JP9458281 A JP 9458281A JP S57210181 A JPS57210181 A JP S57210181A
Authority
JP
Japan
Prior art keywords
piston
displacement chamber
opened
air
hydraulic pump
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
JP56094582A
Other languages
Japanese (ja)
Inventor
Kazumoto Amano
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.)
MITSUWA SEIKI CO Ltd
Sanwa Seiki Ltd
Original Assignee
MITSUWA SEIKI CO Ltd
Sanwa Seiki 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 MITSUWA SEIKI CO Ltd, Sanwa Seiki Ltd filed Critical MITSUWA SEIKI CO Ltd
Priority to JP56094582A priority Critical patent/JPS57210181A/en
Publication of JPS57210181A publication Critical patent/JPS57210181A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/06—Venting

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

PURPOSE:To discharge air naturally without impeding pump performance by boring an air vent hole opened to the displacement chamber of an oil hydraulic pump used for the lifting cylinder of a driver's stand. CONSTITUTION:Bore holes 3f, 3g provided to extract the air in a displacement chamber 3d are connected to the periphery of a piston 3c through the piston lower end face 3e adjacent to the displacement chamber 3d. The portion of the bore hole 3g opened to this periphery is opened to the upper section of said piston 3c at its bottom dead point in contact with the inlet section 3h of a cylinder 3a. The air flowed into the displacement chamber 3d is naturally discharged through the bore holes 3f, 3g when the piston 3c is at its bottom dead point.
JP56094582A 1981-06-20 1981-06-20 Oil hydraulic pump Pending JPS57210181A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56094582A JPS57210181A (en) 1981-06-20 1981-06-20 Oil hydraulic pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56094582A JPS57210181A (en) 1981-06-20 1981-06-20 Oil hydraulic pump

Publications (1)

Publication Number Publication Date
JPS57210181A true JPS57210181A (en) 1982-12-23

Family

ID=14114263

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56094582A Pending JPS57210181A (en) 1981-06-20 1981-06-20 Oil hydraulic pump

Country Status (1)

Country Link
JP (1) JPS57210181A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63170578U (en) * 1987-04-28 1988-11-07

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63170578U (en) * 1987-04-28 1988-11-07

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