US3632240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wear-reducing arrangement for hydraulic gear apparatus
Assignee: Robert Bosch GmbH
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Filing: 1969-11-19
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Granted: 1972-01-04
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Expires: 1989-11-19
Abstract
Abstract Wear-resistant annular discs in recesses of bearing bushings supporting the gears of a gear pump or gear motor, have an outer diameter not greater than the root circle of the gears so that the surfaces of the bearing bushings within the root circles, which are subjected to greater wear than the surface portions engaging the sides of the teeth, are protected.
Inventors
- 👤 Wilhelm Dworak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:02
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/082; F04C2/086; F16; F16C; F16C17/00; F16C17/04; F16C2360/00; F16C2360/42; Y; Y10; Y10S; Y10S417/00; Y10S417/01
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
161 words
Wear-reducing arrangement for hydraulic gear apparatus, comprising, in Combination, a casing; first and second meshing gears located in said casing and having aligned journal portions, respectively, each gear having teeth between a root circle and an outside circle and two annular lateral faces between said journal portions and said root circle; first and second pairs of bearing bushings mounted in said casing, the bearing bushings of said first and second pairs having aligned bearing bores, respectively, supporting said journal portions for rotation about first and second axes, respectively, the bearing bushings of each pair having confronting surfaces in contact with said teeth having an outer diameter equal to the diameter of said outside circle, each of said surfaces being formed with a central annular recess; and an annular wear disc in each recess having an outer diameter substantially equal to the diameter of said root circle and being in sliding engagement with the respective adjacent lateral face of the respective gear.
Claim 2
Dependent Claim
161 words
Wear-reducing arrangement for hydraulic gear apparatus, comprising, in Combination, a casing; first and second meshing gears located in said casing and having aligned journal portions, respectively, each gear having teeth between a root circle and an outside circle and two annular lateral faces between said journal portions and said root circle; first and second pairs of bearing bushings mounted in said casing, the bearing bushings of said first and second pairs having aligned bearing bores, respectively, supporting said journal portions for rotation about first and second axes, respectively, the bearing bushings of each pair having confronting surfaces in contact with said teeth having an outer diameter equal to the diameter of said outside circle, each of said surfaces being formed with a central annular recess; and an annular wear disc in each recess having an outer diameter substantially equal to the diameter of said root circle and being in sliding engagement with the respective adjacent lateral face of the respective gear.
Claim 3
Dependent Claim
32 words
An arrangement as claimed in claim 1 comprising elastic means in each recess biassing the respective wear disc toward and into sliding engagement with the respective lateral face of the respective gear.
Claim 4
Dependent Claim
30 words
An arrangement as claimed in claim 1 wherein each recess has an outer diameter not greater than said diameter of said root circle and opens into the respective bearing bore.
Claim 5
Dependent Claim
52 words
An arrangement as claimed in claim 1 wherein each bearing body is formed with an annular groove in the bottom face of the respective recess; and comprising an elastic annular pretensioned sealing ring located in said groove and biassing the respective wear disc toward the respective lateral face of the respective gear.
Claim 6
Dependent Claim
78 words
An arrangement as claimed in claim 1 wherein each wear disc has a circumferentially extending row of spaced projections on the side remote from the respective gear; wherein each recess has an annular bottom face formed with spaced projections located opposite said projections; and comprising a pretensioned sealing ring between said first and second projections having recesses receiving the same so that said sealing ring, said wear disc, and said bearing bushing cannot turn relative to each other.
Claim 7
Dependent Claim
37 words
An arrangement as claimed in claim 1 comprising means mounting each wear disc in the respective recess nonrotatable and movable in axial direction toward and into sliding engagement with the respective lateral face of the respective gear.
Claim 8
Dependent Claim
29 words
An arrangement as claimed in claim 6 comprising means for biassing the respective wear disc toward and into sliding engagement with the respective lateral face of the respective gear.
Claim 9
Dependent Claim
51 words
An arrangement as claimed in claim 1 comprising elastic means in each recess for urging the respective wear disc in axial direction toward and into sliding engagement with the respective lateral face of the respective gear; and means mounting said wear disc in said recess nonrotatable and movable in axial direction.
Claim 10
Dependent Claim
30 words
An arrangement as claimed in claim 8 wherein said elastic means is an elastic sealing ring disposed in said recess between said wear disc and the bottom of said recess.
Claim 11
Dependent Claim
36 words
An arrangement as claimed in claim 9 wherein said mounting means includes an axially extending pin in each recess secured to the respective bearing bushing and slidingly engaging an axial bore in the respective wear disc.
Claim 12
Dependent Claim
66 words
An arrangement as claimed in claim 1 wherein each wear disc has on the side remote from the respective gear a frustoconical surface; and comprising an annular elastic pretensioned sealing ring surrounding and resiliently abutting said frustoconical surface of each wear disc for urging the respective wear disc into sliding engagement with the respective lateral face of the respective gear, while sealing the respective bearing bore.
Claim 13
Dependent Claim
43 words
An arrangement as claimed in claim 11 wherein each wear disc forms in the respective recess a pressure chamber partly bounded by said frustoconical surface; and wherein the greatest diameter of said frustoconicaL surface is less than the outer diameter of said disc.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |