US3574492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bushing arrangement for rotary shafts
Assignee: SPX Technologies Inc
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Filing: 1969-09-26
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Granted: 1971-04-13
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Expires: 1989-09-26
Abstract
Abstract A scheme for reducing corner loading on a plain bearing or bushing employed to support a rotary shaft, such as the gearcarrying shaft of a gear pump or motor, which is subjected to unbalanced radial loads. The scheme consists of a tapered clearance space formed between the outer periphery of the bushing and the wall of the bore in the supporting structure in which the bushing is secured. This space is at least coextensive with the load zone of the bushing in the circumferential direction and extends longitudinally from the overloaded end of the bushing a distance greater than one-half the length of the bushing, but not so far as to preclude a secure fit between the bushing and the bore. Preferably the clearance space surrounds the bushing, and extends over about three-fourths the length of the bushing.
Inventors
- 👤 Robert E Schwary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:31
CPC Classifications
F; F16; F16C; F16C23/00; F16C23/02; F16C23/04; F01; F01C; F01C1/00; F01C1/08; F01C1/082; F01C1/086; F01C21/00; F01C21/02; F16C27/00; F16C27/02; F04; F04C; F04C2240/00; F04C2240/50; F04C2240/56
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
102 words
In an apparatus including a bushing tightly fitted into a bore in a structural member and supporting a rotary shaft, the improvement which comprises a clearance space 28 between the outer periphery of the bushing 19 and the wall of said bore 23, the space; a. being at least coextensive with the load zone A or B or A, B of the bushing in the circumferential direction; b. extending longitudinally from one end of the bushing a distance at least one-half the length of the bushing; and c. being tapered to a maximum radial width at said one end of the bushing.
Claim 2
Dependent Claim
102 words
In an apparatus including a bushing tightly fitted into a bore in a structural member and supporting a rotary shaft, the improvement which comprises a clearance space 28 between the outer periphery of the bushing 19 and the wall of said bore 23, the space; a. being at least coextensive with the load zone A or B or A, B of the bushing in the circumferential direction; b. extending longitudinally from one end of the bushing a distance at least one-half the length of the bushing; and c. being tapered to a maximum radial width at said one end of the bushing.
Claim 3
Dependent Claim
20 words
The improvement defined in claim 1 in which the clearance space 28 is an annulus which surrounds the bushing 19.
Claim 4
Dependent Claim
24 words
The improvement defined in claim 1 in which the clearance space 28 extends longitudinally a distance of about three-fourths the length of the bushing.
Claim 5
Dependent Claim
15 words
The improvement defined in claim 1 in which the clearance space 28 is tapered uniformly.
Claim 6
Dependent Claim
20 words
The improvement defined in claim 2 in which the clearance space 28 is bounded radially by cylindrical and conical surfaces.
Claim 7
Dependent Claim
27 words
The improvement defined in claim 5 in which; a. the wall of said bore 23 is cylindrical; and b. said conical surface is on the bushing 19.
Claim 8
Dependent Claim
24 words
The improvement defined in claim 6 in which the clearance space 28 extends longitudinally a distance of about three-fourths the length of the bushing.
Claim 9
Dependent Claim
133 words
In a high-pressure gear pump or motor including a pair of meshing gears each of which is carried by a shaft which is supported by a pair of bushings located at opposite sides of the gear and tightly fitted into bores formed in a housing, the improvement which comprises a clearance space 28 between the outer periphery of each bushing 19-22 and the wall of the mating bore 23-26, the space a. being at least coextensive with the load zone A or B or A, B of the bushing in the circumferential direction; b. extending longitudinally from the end of the bushing nearer the gear a distance at least one-half the length of the bushing; and c. being tapered to a maximum radial width at said end of the bushing nearer the gear.
Claim 10
Dependent Claim
133 words
In a high-pressure gear pump or motor including a pair of meshing gears each of which is carried by a shaft which is supported by a pair of bushings located at opposite sides of the gear and tightly fitted into bores formed in a housing, the improvement which comprises a clearance space 28 between the outer periphery of each bushing 19-22 and the wall of the mating bore 23-26, the space a. being at least coextensive with the load zone A or B or A, B of the bushing in the circumferential direction; b. extending longitudinally from the end of the bushing nearer the gear a distance at least one-half the length of the bushing; and c. being tapered to a maximum radial width at said end of the bushing nearer the gear.
Claim 11
Dependent Claim
25 words
The improvement defined in claim 8 in which each clearance space 28 is an annulus which surrounds the associated bushing 19, 20, 21 or 22.
Claim 12
Dependent Claim
15 words
The improvement defined in claim 8 in which each clearance space 28 is tapered uniformly.
Claim 13
Dependent Claim
20 words
The improvement defined in claim 9 in which each clearance space 28 is bounded radially by cylindrical and conical surfaces.
Claim 14
Dependent Claim
28 words
The improvement defined in claim 11 in which: a. the wall of each of said bores 23-26 is cylindrical; and b. said conical surface is on the bushing.
Claim 15
Dependent Claim
24 words
The improvement defined in claim 10 in which each clearance space 28 extends longitudinally a distance of about three-fourths the length of the bushing.
Claim 16
Dependent Claim
24 words
The improvement defined in claim 12 in which each clearance space 28 extends longitudinally a distance of about three-fourths the length of the bushing.
References Cited (Backward Citations)
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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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |