JPS56146080A - Radial piston type pump motor - Google Patents

Radial piston type pump motor

Info

Publication number
JPS56146080A
JPS56146080A JP4917980A JP4917980A JPS56146080A JP S56146080 A JPS56146080 A JP S56146080A JP 4917980 A JP4917980 A JP 4917980A JP 4917980 A JP4917980 A JP 4917980A JP S56146080 A JPS56146080 A JP S56146080A
Authority
JP
Japan
Prior art keywords
roller
cam surface
cam
rolls
piston
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
JP4917980A
Other languages
Japanese (ja)
Inventor
Kazuyoshi Hatano
Susumu Hioki
Yoshiaki Ibaraki
Toshihiro Yamada
Eiji Yonetani
Haruo Kokubu
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 JP4917980A priority Critical patent/JPS56146080A/en
Publication of JPS56146080A publication Critical patent/JPS56146080A/en
Pending legal-status Critical Current

Links

Landscapes

  • Reciprocating Pumps (AREA)

Abstract

PURPOSE: To prevent the contact pressure of a spherical roller with respect to cam surface from increasing locally and to prevent the roller from sliding on the cam surface by a method wherein the cam surface on which the spherical roller attached to a piston rolls is formed such that the part of the surface subject to a high load has a roughness different from that of the part sibject to a low load.
CONSTITUTION: The roller 3 which is circular in section ahd which rolls on the cam surface of a cam ring 20 is attached to the piston and the piston is fitted in a cylinder block so as to take reciprocating motions in the radial direction. On the inner peripheral surface of the cam ring 20 there are formed a precision cam surface 20a which is finished to a mirror surface having a roughness of below 1μ and a coarse cam surface 20b which is finished to have a roughness of above 1μ so that the contact pressure of the roller 3 with respect to the precision cam surface 20a becomes equally low. On the other hand, the roller 3 rolls on the coarse cam surface 20b without sliding since the roller and the surface come into close metal-to-metal contact with each other.
COPYRIGHT: (C)1981,JPO&Japio
JP4917980A 1980-04-16 1980-04-16 Radial piston type pump motor Pending JPS56146080A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4917980A JPS56146080A (en) 1980-04-16 1980-04-16 Radial piston type pump motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4917980A JPS56146080A (en) 1980-04-16 1980-04-16 Radial piston type pump motor

Publications (1)

Publication Number Publication Date
JPS56146080A true JPS56146080A (en) 1981-11-13

Family

ID=12823820

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4917980A Pending JPS56146080A (en) 1980-04-16 1980-04-16 Radial piston type pump motor

Country Status (1)

Country Link
JP (1) JPS56146080A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014214683A (en) * 2013-04-26 2014-11-17 三菱重工業株式会社 Radial piston type hydraulic machine, hydraulic transmission and wind power generation equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014214683A (en) * 2013-04-26 2014-11-17 三菱重工業株式会社 Radial piston type hydraulic machine, hydraulic transmission and wind power generation equipment

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