US5868061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic axial piston machine
Assignee: Danfoss AS
•
Filing: 1995-02-17
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Granted: 1999-02-09
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Expires: 2015-02-17
Abstract
Abstract A hydraulic axial piston machine is described, having axially movable pistons, which at one end bear by means of slider shoes against a slanting plate, and having a pressure plate (10) for holding the slider shoes in contact with the slanting plate. Under certain operating conditions the slider shoes have a tendency to tilt and lift away from the slanting plate at one side. To prevent this, the pressure plate (10) acts only on a part lying, in the radial direction of the slanting plate (7), outside a predetermined region (28).
Inventors
- 👤 Ove Thorb.o slashed.l Hansen
- 👤 Lars Martensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:10
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/20; F04B1/2014; F04B1/122; F04B1/124; F04B1/126; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18296; Y10T74/18336
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
83 words
A hydraulic axial piston machine having axially movable pistons, said pistons having slider shoes at one end bearing against a slanting plate, and having a pressure plate for holding the slider shoes in contact with the slanting plate, the pressure plate having an unmounted outer periphery and being formed with a contact surface bearing in a planar fashion on a part of the slider shoes lying, in the radial direction of the slanting plate, outside a predetermined region formed in the pressure plate.
Claim 2
Dependent Claim
83 words
A hydraulic axial piston machine having axially movable pistons, said pistons having slider shoes at one end bearing against a slanting plate, and having a pressure plate for holding the slider shoes in contact with the slanting plate, the pressure plate having an unmounted outer periphery and being formed with a contact surface bearing in a planar fashion on a part of the slider shoes lying, in the radial direction of the slanting plate, outside a predetermined region formed in the pressure plate.
Claim 3
Dependent Claim
16 words
A machine according to claim 1 in which the predetermined region has a substantially circular form.
Claim 4
Dependent Claim
47 words
A machine according to claim 1, in which the predetermined region has a radially outer boundary which extends a predetermined radial extent, the pressure plate having openings through which the slider shoes and the piston ends respectively pass, the openings having midpoints lying within said outer boundary.
Claim 5
Dependent Claim
32 words
A machine according to claim 3, in which the radially outer boundary is a distance from the midpoints of the openings that is less than 22% of the diameter of the openings.
Claim 6
Dependent Claim
25 words
A machine according to claim 1, in which the predetermined region comprises a recess in a side of the pressure plate facing the slanting plate.
Claim 7
Dependent Claim
21 words
A machine according to claim 5, in which the recess has a depth from about 1/10 mm to about 3/10 mm.
Claim 8
Dependent Claim
25 words
A machine according to claim 5, in which the recess does not exceed a depth of about 5% of the thickness of the pressure plate.
Claim 9
Dependent Claim
47 words
A machine according to claim 2, in which the predetermined region has a radially outer boundary which extends a predetermined radial extent, the pressure plate having openings through which the slider shoes and the piston ends respectively pass, the openings having midpoints lying within said outer boundary.
Claim 10
Dependent Claim
32 words
A machine according to claim 8, in which the radially outer boundary is a distance from the midpoints of the openings that is less than 22% of the diameter of the openings.
Claim 11
Dependent Claim
25 words
A machine according to claim 2, in which the predetermined region comprises a recess in a side of the pressure plate facing the slanting plate.
Claim 12
Dependent Claim
21 words
A machine according to claim 10, in which the recess has a depth from about 1/10 mm to about 3/10 mm.
Claim 13
Dependent Claim
25 words
A machine according to claim 6, in which the recess does not exceed a depth of about 5% of the thickness of the pressure plate.
References Cited (Backward Citations)
US3641829A
Cited
US3861276A
Cited
US3996841A
Cited
US4014628A
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US4252051A
Cited
US4620475A
Cited
US5046403A
Cited
US5520088A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-02-08 | 2002-08-10 | 2003-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-08 | 2006-08-10 | 2007-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-08 | 2010-08-10 | 2011-02-09 | $7700.00 | Window Closed / Lapsed |