Patent US3828653A successfully refreshed from Google Patents.
US3828653A
Expired / Lapsed
US
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Slide shoe and piston arrangement
Assignee: Robert Bosch GmbH
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Filing: 1972-04-10
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Granted: 1974-08-13
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Expires: 1992-04-10
Abstract
Abstract In a hydostatic rotary pump or motor having a cylinder block with cylinders, pistons are mounted which are provided with slide shoes engaging an eccentric annular actuating guide means so that the pistons are reciprocated. Each piston has a spherical end face in sliding contact with a spherical inner slide shoe face having the same radius and center. Mechanical connecting means mount the slide shoe on the piston for angular movement about the center.
Inventors
- 👤 E Knodel
- 👤 U Aldinger
- 👤 G Kersten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:22
CPC Classifications
F; F01; F01B; F01B1/00; F01B1/06; F01B1/0641; F01B1/0644; F16; F16J; F16J1/00; F16J1/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
191 words
In combination with a rotary hydrostatic machine including a cylinder block element having cylinders, and an actuating guide element, one of said elements being rotatable relative to the other element; a slide shoe and piston arrangement comprising a piston having a stepped inner bore forming a curved seat, said piston being movable in one of said cylinders between advanced and retracted positions, and ending in a curved convex piston end face having a predetermined radius, and a center of curvature located in said cylinder in said retracted and advanced positions; a slide shoe having an outer face slidingly engaging said actuating guide element, and an inner curved concave slide shoe face having the same radius and center of curvature as said piston end face; and attaching means having a first end portion mounted in said curved seat of said piston for angular movement about said center, and a second end portion fixedly secured to said slide shoe, said end portions being spaced a predetermined radial distance so that said slide shoe and attaching means can move about said center while said inner slide shoe face slides on said piston end face.
Claim 2
Dependent Claim
191 words
In combination with a rotary hydrostatic machine including a cylinder block element having cylinders, and an actuating guide element, one of said elements being rotatable relative to the other element; a slide shoe and piston arrangement comprising a piston having a stepped inner bore forming a curved seat, said piston being movable in one of said cylinders between advanced and retracted positions, and ending in a curved convex piston end face having a predetermined radius, and a center of curvature located in said cylinder in said retracted and advanced positions; a slide shoe having an outer face slidingly engaging said actuating guide element, and an inner curved concave slide shoe face having the same radius and center of curvature as said piston end face; and attaching means having a first end portion mounted in said curved seat of said piston for angular movement about said center, and a second end portion fixedly secured to said slide shoe, said end portions being spaced a predetermined radial distance so that said slide shoe and attaching means can move about said center while said inner slide shoe face slides on said piston end face.
Claim 3
Dependent Claim
24 words
Slide shoe and piston means as claimed in claim 1, wherein said end portions of said attaching means are fixedly connected to each other.
Claim 4
Dependent Claim
85 words
Slide shoe and piston means as claimed in claim 1, wherein said piston has a stepped inner bore forming an annular spherical seat; wherein said slide shoe has a recess in said outer face and an opening connected with said recess and forming a shoulder; and wherein attaching means includes a screw passing through said opening and having head located in said recess abutting said shoulder, and a spherical nut screwed onto said screw and mounted in said seat for angular movement about said center.
Claim 5
Dependent Claim
37 words
Slide shoe and piston means as claimed in claim 1, wherein said slide shoe has a recess in said outer face thereof; and wherein said connecting member has a throttle passage connecting said recess with said cylinder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |