US3814557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid displacement apparatus having helical displacement elements
Assignee: Allweiler GmbH
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Filing: 1971-06-30
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Granted: 1974-06-04
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Expires: 1991-06-30
Abstract
Abstract A fluid displacement apparatus, such as a pump or motor in which three helically splined elements are arranged in parallel and in meshing engagement. Profile discs are mounted on the elements to provide a predetermined pitch and a possible variation in the delivery surface. The discs are secured for relative movement with respect to the outer housing or the element on which they are mounted.
Inventors
- 👤 H Volz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:31
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/12; F04C2/14; F04C2/16; F04C2/165
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
134 words
A fluid displacement apparatus, such as a pump or motor, comprising: a housing; at least two helical displacement elements arranged within said housing in meshing engagement and with their axes parallel to each other, at least one element thereof being adapted to drive or be driven and another being effective to act as a seal, said elements having helical threads in which the effective pitch and the delivery surface formed by the space between the teeth in the helical threads, within the operating area of the elements, are variable; the change in the pitch and the change in the delivery surface being substantially inversely proportional, and the product of said delivery surface and of the effective pitch of said helical threads providing substantially the same value at any desired cross-section of the operating area.
Claim 2
Dependent Claim
134 words
A fluid displacement apparatus, such as a pump or motor, comprising: a housing; at least two helical displacement elements arranged within said housing in meshing engagement and with their axes parallel to each other, at least one element thereof being adapted to drive or be driven and another being effective to act as a seal, said elements having helical threads in which the effective pitch and the delivery surface formed by the space between the teeth in the helical threads, within the operating area of the elements, are variable; the change in the pitch and the change in the delivery surface being substantially inversely proportional, and the product of said delivery surface and of the effective pitch of said helical threads providing substantially the same value at any desired cross-section of the operating area.
Claim 3
Dependent Claim
134 words
A fluid displacement apparatus, such as a pump or motor, comprising: a housing; at least two helical displacement elements arranged within said housing in meshing engagement and with their axes parallel to each other, at least one element thereof being adapted to drive or be driven and another being effective to act as a seal, said elements having helical threads in which the effective pitch and the delivery surface formed by the space between the teeth in the helical threads, within the operating area of the elements are variable; the change in the pitch and the change in the delivery surface being substantially inversely proportional, and the product of said delivery surface and of the effective pitch of said helical threads providing essentially the same value at any desired cross-section of the operating area.
Claim 4
Dependent Claim
134 words
A fluid displacement apparatus, such as a pump or motor, comprising: a housing; at least two helical displacement elements arranged within said housing in meshing engagement and with their axes parallel to each other, at least one element thereof being adapted to drive or be driven and another being effective to act as a seal, said elements having helical threads in which the effective pitch and the delivery surface formed by the space between the teeth in the helical threads, within the operating area of the elements are variable; the change in the pitch and the change in the delivery surface being substantially inversely proportional, and the product of said delivery surface and of the effective pitch of said helical threads providing essentially the same value at any desired cross-section of the operating area.
Claim 5
Dependent Claim
43 words
A fluid displacement apparatus according to claim 2, wherein said elements have threads with an inside and outside diameter of different dimension and the variation in the delivery surface is effected by changing the tooth widths of the helical threads of said elements.
Claim 6
Dependent Claim
43 words
A fluid displacement apparatus according to claim 2, wherein said housing has an inlet and outlet providing a pressure and suction region with the pitch of the helical threads of said elements being larger in the pressure region than in the suction region.
Claim 7
Dependent Claim
48 words
A fluid displacement apparatus according to claim 2, wherein the common axial location of said displacement elements is effected by means of shaft collars in engagement with each other, at least the shaft collar on one of two cooperating displacement elements being steplessly adjustable in an axial direction.
Claim 8
Dependent Claim
31 words
A fluid displacement apparatus according to claim 2, wherein the diaplacement elements comprise multishaped tooth-profile discs arranged axially in rows and staggered in relation to each other and to said pitch.
Claim 9
Dependent Claim
58 words
A fluid displacement apparatus according to claim 6, wherein said shaft has a non-constant pitch, with the angular position of said discs being staggered relative to each other so that the effective pitch resulting from the pitch of the shaft and the angular position of the tooth-profile discs coincides with the desired predetermined pitch of the helical thread.
Claim 10
Dependent Claim
60 words
A fluid displacement apparatus according to claim 6, wherein said elements comprise a central and two side elements with the geometrical mean value of the tooth-widths at the forward and rear ends of said central displacement element corresponding approximately to the tooth-width at which no torque is transferred to said side displacement elements through the flanks of the helical threads.
Claim 11
Dependent Claim
40 words
A fluid displacement apparatus according to cLaim 6, wherein each of said elements comprises a shaft and said tooth-profile discs are mounted on said shaft, the latter having a predetermined pitch, and said discs are aligned relative to said pitch.
Claim 12
Dependent Claim
25 words
A fluid displacement apparatus according to claim 9, wherein said shaft is grooved, and pins projecting into said grooves securing said discs to said shaft.
Claim 13
Dependent Claim
28 words
A fluid displacement apparatus according to claim 9, wherein said shaft has a constant pitch with the angular position of said discs varying in relation to the pitch.
Claim 14
Dependent Claim
44 words
A fluid displacement apparatus according to claim 9, wherein the common axial location of said shafts is effected by shaft collars in engagement with each other, at least the shaft collar on one of two cooperating shafts being steplessly adjustable in an axial direction.
Claim 15
Dependent Claim
44 words
A fluid displacement apparatus according to claim 9, wherein said shafts have a common axial location effected by means of herring-bone gearwheels with at least one of two engaging gears being steplessly adjustable in an axial direction, and clamping means between said two gears.
Claim 16
Dependent Claim
18 words
A fluid displacement apparatus according to claim 9, wherein said tooth-profile discs are formed with a multi-groove profile.
Claim 17
Dependent Claim
17 words
A fluid displacement apparatus according to claim 14, wherein said multi-groove profile has a splined shaft configuration.
Claim 18
Dependent Claim
17 words
A fluid displacement apparatus according to claim 14, wherein said multi-groove profile has a serrated tooth configuration.
Claim 19
Dependent Claim
35 words
A fluid displacement apparatus according to claim 9, wherein said shafts are longer than the length of the rows of tooth-profile discs, and said tooth-profile discs are arranged to be axially displaceable along said shafts.
Claim 20
Dependent Claim
36 words
A fluid displacement apparatus according to claim 17, wherein said tooth-profile discs are axially fixed in relation to said housing, and said tooth-profile discs and said housing are axially displaceable along and relative to said shafts.
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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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |