Patent US3873243A successfully refreshed from Google Patents.
US3873243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel pump assembly
Assignee: Robert Bosch GmbH
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Filing: 1973-11-19
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Granted: 1975-03-25
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Expires: 1993-11-19
Abstract
Abstract A fuel pump assembly wherein a hydrodynamic fuel pump is mounted in a housing adjacent to an electric motor and wherein fuel issuing from the pump flows around the armature of the motor before it leaves the housing. An auxiliary pump is mounted between the rotary part of the fuel pump and the armature and is driven by the latter to insure the flow of fuel from a chamber which surrounds the armature into a clearance between the internal surface of the armature and the periphery of a fixed shaft which is mounted in the housing and in the stationary part of the fuel pump. The armature rotates on and with two friction bearings consisting of porous material and being disposed at the ends of the annular clearance. The auxiliary pump insures that fuel flows between the shaft and the bearings to thus guarantee a satisfactory positive lubrication of these bearings whenever the armature rotates.
Inventors
- 👤 Hermann Nusser
- 👤 Hans-Reimer Speck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:22
CPC Classifications
F; F02; F02M; F02M37/00; F02M37/04; F02M37/048; F02M37/14; F04; F04D; F04D13/00; F04D13/12; F04D5/00; F04D5/002; H; H02; H02K; H02K5/00; H02K5/04; H02K5/12; H02K5/16; H02K5/167; H02K5/1677
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
125 words
Apparatus for conveying a fluid, particularly liquid fuel, comprising a hydrodynamic pump having a rotary part; an electric motor having an armature arranged to drive said rotary part; a housing surrounding said pump and motor and defining a chamber receiving pressurized fluid from said pump and surrounding said armature; a shaft mounted in said housing coaxially with said armature; a pair of spaced apart bearings surrounding said shaft, at least one of said bearings being disposed between said shaft and said armature, said shaft and said armature defining a space extending between said bearings; and auxiliary pump means driven by said armature and arranged to effect the flow of fluid between said chamber and said space whereby the fluid enteriNg said space lubricates said bearings.
Claim 2
Dependent Claim
125 words
Apparatus for conveying a fluid, particularly liquid fuel, comprising a hydrodynamic pump having a rotary part; an electric motor having an armature arranged to drive said rotary part; a housing surrounding said pump and motor and defining a chamber receiving pressurized fluid from said pump and surrounding said armature; a shaft mounted in said housing coaxially with said armature; a pair of spaced apart bearings surrounding said shaft, at least one of said bearings being disposed between said shaft and said armature, said shaft and said armature defining a space extending between said bearings; and auxiliary pump means driven by said armature and arranged to effect the flow of fluid between said chamber and said space whereby the fluid enteriNg said space lubricates said bearings.
Claim 3
Dependent Claim
22 words
Apparatus as defined in claim 1, wherein said bearings are friction bearings which rotate with said armature with respect to said shaft.
Claim 4
Dependent Claim
17 words
Apparatus as defined in claim 1, further comprising a support provided in said housing for said shaft.
Claim 5
Dependent Claim
47 words
Apparatus as defined in claim 1, wherein said auxiliary pump means comprises a pumping member disposed between said rotary part and said armature and having at least one passage one end of which communicates with said chamber and the other end of which communicates with said space.
Claim 6
Dependent Claim
29 words
Apparatus as defined in claim 4, wherein said passage extends substantially radially of said shaft and its cross-sectional area increases gradually from said other toward said one end thereof.
Claim 7
Dependent Claim
24 words
Apparatus as defined in claim 4, wherein said pumping member comprises two coaxial passages extending at right angles to the axis of said shaft.
Claim 8
Dependent Claim
75 words
Apparatus as defined in claim 1, wherein said rotary part is rigid with said armature and forms therewith a rotor having an axial bore for said shaft, the diameter of said bore exceeding the diameter of said shaft to thus provide said space between the internal surface of said rotor and the external surface of said shaft, said bearings being located in and at the ends of said bore and being rigid with said rotor.
Claim 9
Dependent Claim
18 words
Apparatus as defined in claim 1, wherein at least one of said bearings is a porous friction bearing.
Claim 10
Dependent Claim
14 words
Apparatus as defined in claim 1, wherein said pump is a side channel pump.
Claim 11
Dependent Claim
42 words
Apparatus as defined in claim 1, wherein said housing is elongated and has a fluid-admitting inlet at one end and a fluid-discharging outlet at the other end thereof, said pump being adjacent to said inlet and said chamber communicating with said outlet.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |