JPS579933A - Hydraulic circuit for reduction of noise produced by construction machinery - Google Patents

Hydraulic circuit for reduction of noise produced by construction machinery

Info

Publication number
JPS579933A
JPS579933A JP8273280A JP8273280A JPS579933A JP S579933 A JPS579933 A JP S579933A JP 8273280 A JP8273280 A JP 8273280A JP 8273280 A JP8273280 A JP 8273280A JP S579933 A JPS579933 A JP S579933A
Authority
JP
Japan
Prior art keywords
branch
reduction
actuators
pump
hoses
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
JP8273280A
Other languages
Japanese (ja)
Inventor
Seiji Tamura
Tadayasu Hirabayashi
Hideo Narita
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 Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery 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 Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP8273280A priority Critical patent/JPS579933A/en
Publication of JPS579933A publication Critical patent/JPS579933A/en
Pending legal-status Critical Current

Links

Landscapes

  • Details Of Reciprocating Pumps (AREA)
  • Component Parts Of Construction Machinery (AREA)

Abstract

PURPOSE: To reduce a pulsating pressure of a pump by bringing either a hose or a branch hose into a block state and to prevent the reduction of a mechanical vibration noise, by a method wherein the hose connects together a pump and a control valve, and simultaneously, the branch base joins together the pump and a main relief valve.
CONSTITUTION: When actuators 8 and 9 operated through the operation of control valves 4a and 5a, and when a load applied to the actuators 8 and 9 is low and is lower than a discharge pressure of pumps 2, 3 and a set pressure of main relief valves 12, 13, the main valves 12 and 13 are closed, and branch hoses 18 and 19 are in a block state. Thus, the branch hoses 18 and 19 display a muffler effect. When the load applied to the actuators 8 and 9 is high, the main relief valves 12 and 13 are opened, and rubber hoses 16 and 17 are brought into a block state. As a result, the rubber hoses 16 and 17 display the muffler effect.
COPYRIGHT: (C)1982,JPO&Japio
JP8273280A 1980-06-20 1980-06-20 Hydraulic circuit for reduction of noise produced by construction machinery Pending JPS579933A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8273280A JPS579933A (en) 1980-06-20 1980-06-20 Hydraulic circuit for reduction of noise produced by construction machinery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8273280A JPS579933A (en) 1980-06-20 1980-06-20 Hydraulic circuit for reduction of noise produced by construction machinery

Publications (1)

Publication Number Publication Date
JPS579933A true JPS579933A (en) 1982-01-19

Family

ID=13782583

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8273280A Pending JPS579933A (en) 1980-06-20 1980-06-20 Hydraulic circuit for reduction of noise produced by construction machinery

Country Status (1)

Country Link
JP (1) JPS579933A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62101411A (en) * 1985-10-28 1987-05-11 Tokai Rubber Ind Ltd Manufacture of rubber bush
JPS62104717A (en) * 1985-10-31 1987-05-15 Tokai Rubber Ind Ltd Preparation of plastic rod with rubber bushing

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62101411A (en) * 1985-10-28 1987-05-11 Tokai Rubber Ind Ltd Manufacture of rubber bush
JPH0353092B2 (en) * 1985-10-28 1991-08-14 Tokai Rubber Ind Ltd
JPS62104717A (en) * 1985-10-31 1987-05-15 Tokai Rubber Ind Ltd Preparation of plastic rod with rubber bushing
JPH0353094B2 (en) * 1985-10-31 1991-08-14 Tokai Rubber Ind Ltd

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