US3783743A - Axial piston hydraulic transducer shoe retainer structure - Google Patents

Axial piston hydraulic transducer shoe retainer structure Download PDF

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Publication number
US3783743A
US3783743A US00307320A US3783743DA US3783743A US 3783743 A US3783743 A US 3783743A US 00307320 A US00307320 A US 00307320A US 3783743D A US3783743D A US 3783743DA US 3783743 A US3783743 A US 3783743A
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US
United States
Prior art keywords
retainer
piston
socket
plate
rocker cam
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.)
Expired - Lifetime
Application number
US00307320A
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English (en)
Inventor
D Raymond
G Smith
A Viles
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.)
Hagglunds Denison Corp
Original Assignee
Abex Corp
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 Abex Corp filed Critical Abex Corp
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Publication of US3783743A publication Critical patent/US3783743A/en
Assigned to HAGGLUNDS DENISON CORPORATION reassignment HAGGLUNDS DENISON CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ABEX CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
    • F04B1/124—Pistons
    • F04B1/126—Piston shoe retaining means

Definitions

  • ABSTRACT In hydraulic transducer apparatus of axial piston type having a rotatable piston barrel mounted within a body, a rocker cam defining a swash plate having a slip surface pivotally mounted within an accommodating cradle including within the said body, and a plurality of piston structures including piston shoes reciprocatively mounted with such piston shoes disposed in abutting relation with the swash plate.
  • a piston shoe retainer structure is provided operable to urge said piston shoes into even and uniform abutting contact with the swash plate slip surface.
  • the shoe retainer structure comprises: A shoe retainer plate is provided which is rotatable with the pistons and which respectively retains the piston shoes against the slip surface.
  • a spherical retainer socket is disposed to urge the plate and the shoes against the swash plate surface through a thrust bearing, the retainer socket having means cooperating with said rocker cam to prevent rotation of the retainer socket.
  • a fastener means extends into the rocker cam and connects the retainer socket and the retainer plate through a spherical washer universally fitted into the socket.
  • Resilient retainer means such as a Belleville spring structure, connects the fastener means into prestressed relation with the rocker cam.
  • the shoe retainer structure is operable independently of the piston barrel structure.
  • the invention also provides a piston shoe retainer structure which serves to retain the piston shoes against the pump swash plate in an even and uniform manner even though there may be some distortion and/or misalignment within the pump as caused during fabrication or, more importantly, as caused during operation when the pump is operating under stress of high fluid pressures.
  • the invention further provides a piston shoe retainer structure which is adapted to function independently of the pump piston barrel structure.
  • hydraulic transducer apparatus ofaxial piston type having rotatable piston barrel means mounted within a body, rocker cam means defining a swash plate having a slip surface pivotally mounted within accommodating cradle means includingwithin the body, and a plurality of piston means including piston shoes reciprocatively mounted with the piston shoes disposed in abutting relation with said swash plate.
  • a piston shoe retainer structure is provided operable to urge the piston shoes into universal abutting contact with said swash plate slip surface which comprises: A shoe retainer plate rotatable with the piston means and respectively retaining the piston shoes against the slip surface.
  • a spherical retainer socket means is disposed to urge the plate and shoes against the surface through thrust bearing means, the retainer socket having means cooperating with the rocker cam to prevent rotation of the retainer socket.
  • a fastener means extends into the rocker cam and connects theretainer socket and the retainer plate through a spherical washer means universally fitted into the socket means.
  • a resilient retainer means connectsthe fastener means into pre-stressed relation with the rocker cam means. The arrangement is-such that the shoe retainer structure is operable independently of the piston barrel means.
  • FIG. 3 is a partial axial section of the pumptaken along the line 33 of FIG. 2.
  • FIG. 4 is an enlarged portion of the structure shown in FIG. 3.
  • a hydraulic transducer pump or motor 46 of the axial piston type having a drive shaft 11 rotatably mounted through a port block 12 into a rotatable piston barrel 13, which in turn is rotatably mounted within a pump body 14 by means of a bearing assembly 15.
  • a plurality of pump pistons 16 are mounted within respective cylinders 17 defined within the barrel 13.
  • a piston shoe 18 is pivotably attached to each piston and retained against a creep plate 19 by means of a shoe retainer assembly 21. Creep plate 19 is also termed a swash plate herein.
  • Creep plate 19 and retainer assembly 21 are mounted with a rocker cam 22 which is received in pivoted relation within a cradle 23 defined by and within an end cap 24.
  • End cap 24 abuts a spacer ring 25 which supports bearing assembly 15 and barrel 13 into appropriate operating position when end cap 24 is assembled with body 14 as shown.
  • End cap 24 is connected with body 14 by means of fasteners (not shown) such as cap screws.
  • shoe retainer assembly 21 is comprised of a shoe retainer plate 26 which retains piston shoes 18 against creep plate 19 during operation of the pump 46.
  • Retainer plate 26 is supported from rocker cam 22 through the combination of a thrust bearing 27, a spherical hold-down socket 28 abutting the thrust bearing and spherical retainer washer 29 received in the socket 28.
  • a cap screw or bolt 33 extends through and retains washer 29 in a fixed relation relative to rocker cam 22.
  • Lugs 31 project from socket 28 into slots 32 defined in a rocker cam 22 to prevent rotation of shoe retainer assembly 21 relative to rockercam 22.
  • Cap screw 33 is resiliently secured in rocker cam 22 by means of a castle nut 36 which retains a spring retainer 34.
  • Spring retainer 34 in turn retains spring means 35 (Belleville springs, for example) in compression.
  • a retainer key 37 restrains rotation of nut 36 to an adjusted position which establishes the compressive force exerted by spring means 35.
  • the shoulder of spring retainer 34 slightly clears the counterbore 43 of the rocker cam 22 to enable retainer plate 26 to move very slightly in response to axial force applied along cap screw 33.
  • the purpose of this feature, as shown and described, is to allow only limited lift off of piston shoes 18. Such lift off behavior is well recognized.
  • the counterbore 43 opens into a bore 44, forming a socket which houses the elements 33, 34, 35, 36, and 37 of shoe retainer assembly 21.
  • drive shaft 11 is seen to be secured in splined connection within barrel 13 by means of a fastener, such as a cap screw 39, drawn down against a spring means 41 (such as Bellevillesprings) and a support washer 42, th'e. washer 42 being in abuttmen-t with the barrel 13 as shown.
  • a fastener such as a cap screw 39
  • spring means 41 such as Bellevillesprings
  • support washer 42 th'e. washer 42 being in abuttmen-t with the barrel 13 as shown.
  • the shaft 11 is retained in the opposite direction by thrust means (not shown) provided within port block 12.
  • shoe retainer assembly 21 provides an'even retaining force on each of the piston shoes 18 to retain the shoes appropriately against swash plate 19 while permitting universal movement between the spherical hold-down socket 228 and spherical retainer washer 29 to accommodate for any distortion or misalignment in the system as may be caused during operation under stress of high fluid pressure. It is to be noted that the shoe retainer 21 is selfcontained with rocker cam 22 and functions completely independently of the assembly of piston barrel 13.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)
US00307320A 1972-11-16 1972-11-16 Axial piston hydraulic transducer shoe retainer structure Expired - Lifetime US3783743A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US30732072A 1972-11-16 1972-11-16

Publications (1)

Publication Number Publication Date
US3783743A true US3783743A (en) 1974-01-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00307320A Expired - Lifetime US3783743A (en) 1972-11-16 1972-11-16 Axial piston hydraulic transducer shoe retainer structure

Country Status (6)

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US (1) US3783743A (enrdf_load_html_response)
CA (1) CA978804A (enrdf_load_html_response)
DE (1) DE2341106A1 (enrdf_load_html_response)
FR (1) FR2207533A5 (enrdf_load_html_response)
GB (1) GB1438190A (enrdf_load_html_response)
IT (1) IT990087B (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898917A (en) * 1974-01-31 1975-08-12 Abex Corp Variable displacement fluid translating device

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4111103A (en) * 1977-02-14 1978-09-05 Commercial Shearing, Inc. Thrust rings for swash plate pumps and motors
JPS5770968A (en) * 1980-10-22 1982-05-01 Honda Motor Co Ltd Swash plate hydraulic gear
US4729717A (en) * 1986-12-24 1988-03-08 Vickers, Incorporated Power transmission
WO1989006750A1 (en) * 1988-01-16 1989-07-27 Michael Meyerle Hydrostatic axial piston engine, in particular for a motor vehicle gearbox with power split
DE4301119C2 (de) * 1993-01-18 1995-03-30 Danfoss As Schrägscheibenanordnung in einer hydraulischen Axialkolbenmaschine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608159A (en) * 1945-02-02 1952-08-26 Denison Eng Co Hydraulic apparatus
FR1216069A (fr) * 1959-02-06 1960-04-21 Pompe à débit variable et moteur hydraulique
US3110267A (en) * 1958-06-30 1963-11-12 Linde Eismaschinen Ag Axial piston pumps and motors with rotary cylinder blocks
US3241495A (en) * 1963-08-12 1966-03-22 American Brake Shoe Co Construction for axial piston pump or motor
US3410220A (en) * 1965-12-01 1968-11-12 Linde Ag Axial-piston machine
US3437015A (en) * 1967-10-30 1969-04-08 Abex Corp Piston type fluid motor having separately fed piston shoes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608159A (en) * 1945-02-02 1952-08-26 Denison Eng Co Hydraulic apparatus
US3110267A (en) * 1958-06-30 1963-11-12 Linde Eismaschinen Ag Axial piston pumps and motors with rotary cylinder blocks
FR1216069A (fr) * 1959-02-06 1960-04-21 Pompe à débit variable et moteur hydraulique
US3241495A (en) * 1963-08-12 1966-03-22 American Brake Shoe Co Construction for axial piston pump or motor
US3410220A (en) * 1965-12-01 1968-11-12 Linde Ag Axial-piston machine
US3437015A (en) * 1967-10-30 1969-04-08 Abex Corp Piston type fluid motor having separately fed piston shoes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898917A (en) * 1974-01-31 1975-08-12 Abex Corp Variable displacement fluid translating device

Also Published As

Publication number Publication date
FR2207533A5 (enrdf_load_html_response) 1974-06-14
GB1438190A (en) 1976-06-03
IT990087B (it) 1975-06-20
DE2341106A1 (de) 1974-05-22
CA978804A (en) 1975-12-02

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Legal Events

Date Code Title Description
AS Assignment

Owner name: HAGGLUNDS DENISON CORPORATION, OHIO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ABEX CORPORATION;REEL/FRAME:004737/0427

Effective date: 19870630

Owner name: HAGGLUNDS DENISON CORPORATION, 1220 DUBLIN ROAD, C

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ABEX CORPORATION, A CORP. OF DE;REEL/FRAME:004737/0427

Effective date: 19870630