US3871797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel pump for automobiles
Assignee: Hitachi Ltd
•
Filing: 1973-03-20
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Granted: 1975-03-18
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Expires: 1993-03-20
Abstract
Abstract As electric fuel pump for automobiles suspended in a fuel tank, use is made of a vortex pump comprising a casing having an annular groove and an inlet port and an outlet port respectively provided at both ends of said annular groove, and a D.C. motor driven runner arranged opposite to said casing and having a plurality of chambers annularly disposed at an end face of the runner divided by radially extending vane portions, wherein the outlet port of said pump and the backside of the runner are communicated with each other to act the output fuel pressure of the pump on the backside of the runner and thereby to receive thrusts acting on the runner and maintain a gap between the runner and the casing constant.
Inventors
- 👤 Osamu Igarashi
- 👤 Yukio Hohsho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:53
CPC Classifications
F; F04; F04D; F04D5/00; F04D5/002; F02; F02M; F02M37/00; F02M37/04; F02M37/048; F02M37/08; F02M37/10; F02M2037/082
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
196 words
A fuel pump for automobiles, suspended in a fuel tank and used for supplying fuel in the fuel tank to the carburetor of the like, comprising a casing having an inlet port and an outlet port at the opposite ends of an annular groove formed therein, a runner having formed at an end face thereof a plurality of annularly disposed chambers opposed by the annular groove said casing and having a shaft press-fitted into the center thereof, means for axially movably supporting one end of said shaft in said casing, a D. C. motor having an armature integral with said shaft, another shaft provided on that side of said D. C. motor opposite to said first shaft, means for axially movably supporting another shaft in a bracket, spring means for urging said armature towards the runner through brushes for said D. C. motor, passage means provided in the casing for leading fuel from the outlet port to the backside of the runner, and further passage means for discharging the fuel from the backside of the runner to the outside of the pump through the interior of the D. C. motor and neighboring portions of the brushes.
Claim 2
Dependent Claim
196 words
A fuel pump for automobiles, suspended in a fuel tank and used for supplying fuel in the fuel tank to the carburetor of the like, comprising a casing having an inlet port and an outlet port at the opposite ends of an annular groove formed therein, a runner having formed at an end face thereof a plurality of annularly disposed chambers opposed by the annular groove said casing and having a shaft press-fitted into the center thereof, means for axially movably supporting one end of said shaft in said casing, a D. C. motor having an armature integral with said shaft, another shaft provided on that side of said D. C. motor opposite to said first shaft, means for axially movably supporting another shaft in a bracket, spring means for urging said armature towards the runner through brushes for said D. C. motor, passage means provided in the casing for leading fuel from the outlet port to the backside of the runner, and further passage means for discharging the fuel from the backside of the runner to the outside of the pump through the interior of the D. C. motor and neighboring portions of the brushes.
Claim 3
Dependent Claim
36 words
A fuel pump for automobiles, as claimed in claim 1, wherein bearing holes of simple shapes are respectively provided in the casing and bracket as the means for supporting the shafts in said casing and bracket.
Claim 4
Dependent Claim
82 words
A fuel pump for automobiles, as claimed in claim 2, wherein a thrust washer is disposed in a space defined by cutouts respectively formed in the confronting faces of the runner and casing at locations radially inwardly of the respective annular grooves, and the thickness of said thrust washer is selected such that the axial gaps formed between said thrust washer and said runner and casing will become equal to the adequate gap between the runner and casing at the annular grooves.
Claim 5
Dependent Claim
28 words
A fuel pump for automobiles, as claimed in claim 2, wherein said further passage means is provided in said bracket and communicates with the bearing hole provided therein.
Claim 6
Dependent Claim
177 words
A fuel pump for automobiles, suspended in a fuel tank and used for supplying fuel in the fuel tank to a carburetor or the like, comprising a casing having an inlet port and an outlet port at the opposite end of an annular groove formed therein, a runner having formed at an end face thereof a plurality of annularly disposed chambers opposed by the annular groove of said casing and having a shaft press-fitted into the center thereof, means for axially movably supporting one end of said shaft in said casing, a D. C. motor having an armature integral with said shaft, another shaft provided on that side of said D. C. motor opposite to said first shaft, means for axially movably supporting said another shaft in a bracket, spring means for urging said armature towards the runner through brushes for said D. C. motor, passage means provided in the casing for leading fuel from the outlet port to the backside of the runner, and means for adjustaby relieving the pressure on the backside of tHe runner.
Claim 7
Dependent Claim
177 words
A fuel pump for automobiles, suspended in a fuel tank and used for supplying fuel in the fuel tank to a carburetor or the like, comprising a casing having an inlet port and an outlet port at the opposite end of an annular groove formed therein, a runner having formed at an end face thereof a plurality of annularly disposed chambers opposed by the annular groove of said casing and having a shaft press-fitted into the center thereof, means for axially movably supporting one end of said shaft in said casing, a D. C. motor having an armature integral with said shaft, another shaft provided on that side of said D. C. motor opposite to said first shaft, means for axially movably supporting said another shaft in a bracket, spring means for urging said armature towards the runner through brushes for said D. C. motor, passage means provided in the casing for leading fuel from the outlet port to the backside of the runner, and means for adjustaby relieving the pressure on the backside of tHe runner.
Claim 8
Dependent Claim
22 words
A fuel pump for automobiles, as claimed in claim 5, wherein said pressure relieving means includes a channel formed in the bracket.
Claim 9
Dependent Claim
30 words
A fuel pump for automobiles, as claimed in claim 5, wherein means are provided on said first mentioned shaft for maintaining a perdetermined gap between said runner and said casing.
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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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |