FR2380439A1 - Hydraulic motor with axial piston - has double curvature surface on piston end faces to reduce wear - Google Patents

Hydraulic motor with axial piston - has double curvature surface on piston end faces to reduce wear

Info

Publication number
FR2380439A1
FR2380439A1 FR7733439A FR7733439A FR2380439A1 FR 2380439 A1 FR2380439 A1 FR 2380439A1 FR 7733439 A FR7733439 A FR 7733439A FR 7733439 A FR7733439 A FR 7733439A FR 2380439 A1 FR2380439 A1 FR 2380439A1
Authority
FR
France
Prior art keywords
hydraulic motor
piston
end faces
reduce wear
curvature surface
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
FR7733439A
Other languages
French (fr)
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.)
Fiatallis Europe SpA
Original Assignee
Fiat Allis Macchine Movimento Terra SpA
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 Fiat Allis Macchine Movimento Terra SpA filed Critical Fiat Allis Macchine Movimento Terra SpA
Publication of FR2380439A1 publication Critical patent/FR2380439A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0602—Component parts, details
    • F03C1/0605—Adaptations of pistons

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydraulic Motors (AREA)
  • Reciprocating Pumps (AREA)

Abstract

The pistons (7) of a hydraulic motor are pressed against the surface of the swashplate by the pressure of oil in the cylinders. The end faces which are subjected to this pressure are usually made spherical but produce high local compressive stress which cause surface pitting. The end surfaces are made a surface of revolution generated by a circular arc between two points (A, K) with a radius struck from the point (C). This form of surface increases the contact area between the piston end face and the swashplate and so reduces stress. It also reduces wear due to pitting.
FR7733439A 1977-02-15 1977-11-07 Hydraulic motor with axial piston - has double curvature surface on piston end faces to reduce wear Pending FR2380439A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT6733177A IT1073257B (en) 1977-02-15 1977-02-15 VOLUMETRIC HYDRAULIC MACHINE WITH AXIAL PISTONS

Publications (1)

Publication Number Publication Date
FR2380439A1 true FR2380439A1 (en) 1978-09-08

Family

ID=11301509

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7733439A Pending FR2380439A1 (en) 1977-02-15 1977-11-07 Hydraulic motor with axial piston - has double curvature surface on piston end faces to reduce wear

Country Status (2)

Country Link
FR (1) FR2380439A1 (en)
IT (1) IT1073257B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE33455E (en) * 1985-05-28 1990-11-27 Honda Giken Kogyo Kabushiki Kaisha Swashplate assembly for a swashplate type hydraulic pressure device
US5085053A (en) * 1987-12-28 1992-02-04 Honda Giken Kogyo Kabushiki Kaisha Swashplate assembly for a swashplate type hydraulic pressure device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB806325A (en) * 1956-07-31 1958-12-23 British Messier Ltd Improvements in or relating to pumps and motors of the swashplate type
DE1653374A1 (en) * 1967-01-02 1971-10-14 Louis Berholz Pressurized fluid axial piston machine that can be operated as a pump or motor
DE2154327A1 (en) * 1971-11-02 1973-05-10 Orsta Hydraulik Veb K PISTONS FOR HYDROSTATIC PUMPS AND MOTORS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB806325A (en) * 1956-07-31 1958-12-23 British Messier Ltd Improvements in or relating to pumps and motors of the swashplate type
DE1653374A1 (en) * 1967-01-02 1971-10-14 Louis Berholz Pressurized fluid axial piston machine that can be operated as a pump or motor
DE2154327A1 (en) * 1971-11-02 1973-05-10 Orsta Hydraulik Veb K PISTONS FOR HYDROSTATIC PUMPS AND MOTORS

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE33455E (en) * 1985-05-28 1990-11-27 Honda Giken Kogyo Kabushiki Kaisha Swashplate assembly for a swashplate type hydraulic pressure device
US5085053A (en) * 1987-12-28 1992-02-04 Honda Giken Kogyo Kabushiki Kaisha Swashplate assembly for a swashplate type hydraulic pressure device

Also Published As

Publication number Publication date
IT1073257B (en) 1985-04-13

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