GB2045869A - Rotary positive-displacement fluid machines. - Google Patents
Rotary positive-displacement fluid machines. Download PDFInfo
- Publication number
- GB2045869A GB2045869A GB8008372A GB8008372A GB2045869A GB 2045869 A GB2045869 A GB 2045869A GB 8008372 A GB8008372 A GB 8008372A GB 8008372 A GB8008372 A GB 8008372A GB 2045869 A GB2045869 A GB 2045869A
- Authority
- GB
- United Kingdom
- Prior art keywords
- control plate
- housing
- pressure
- pump
- silicon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012530 fluid Substances 0.000 title abstract 2
- 238000006073 displacement reaction Methods 0.000 title 1
- 239000000956 alloy Substances 0.000 claims abstract description 18
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 18
- 238000004512 die casting Methods 0.000 claims abstract description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 18
- 229910052710 silicon Inorganic materials 0.000 claims description 18
- 239000010703 silicon Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 8
- 239000003921 oil Substances 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 239000013078 crystal Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000004347 surface barrier Methods 0.000 claims description 2
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
- F01C21/10—Outer members for co-operation with rotary pistons; Casings
- F01C21/104—Stators; Members defining the outer boundaries of the working chamber
- F01C21/108—Stators; Members defining the outer boundaries of the working chamber with an axial surface, e.g. side plates
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Power Steering Mechanism (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Reciprocating Pumps (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
A high-pressure pump comprises a cam ring 7, a rotary piston 6 with radial sliding-vanes 8, and a movable cheek plate 10, and preferably also a cheek plate 4 integral with the housing 1, which plates are made of a silicon- rich alloy and manufactured by vacuum die-casting. This alloy is said to have a satisfactory structure, wear-resistance and strength. Preferably, the movable cheek plate has an axial seal 21 on the outer side thereof to define an area that is subject to the pressure of working fluid in an outlet chamber 20. <IMAGE>
Description
SPECIFICATION
High Pressure Pumps
The invention relates to high pressure pumps suitable for power-assisted steering systems for motor vehicles.
The invention provides a high pressure pump comprising a housing, a cam ring mounted inside the housing, a rotary piston with radial slots fitted with movable operating slides in close contact with a cam ring, and at least one control plate of a silicon-rich alloy manufactured by a vacuum diecasting process.
The manufacture of the control plate from a silicon-rich alloy.by vacuum die-casting leads to a homogeneous structure with a few pinholes and a wear-resistant surface. Surprisingly, it can withstand the working pressure on the delivery side. Control plates manufactured in this way are cheap to produce, giving also saving in weight.
The pump housing is preferably made as a casting, avoiding undercuts, and preferably of a silicon-rich alloy and incorporating a control plate on the drive side of the pump. To limit pressure equalisation, the pressure bearing area is advantageously reduced by the use of an axial seal fitted on the discharge side of the control plate. In this way the hydraulic pressure is equalized at the frontal gap, thus preventing an overloading of this control plate.
Drawing:
The drawing shows an axial section through a vane pump according to the invention.
A pump housing 1 is provided with stiffening ribs 1A, and is made from a silicon-rich alloy by a vacuum die-casting process. A control plate 4 on the drive side has oil channels 2,3 and 2A,3A and forms an integral part of the housing. Inside the housing 1, a drive shaft 5 is connected to a rotor 6 via a bevel gear. The rotor 6 comprises a number of radial slots, not shown in the drawing, in which radially movable operating slides 8 contact a cam ring 7. A loose control plate 10 of the same alloy as the housing 1 is supported against the cam ring 7, and is provided with pressure openings 11, 11A and partly-annular oil channels 13, 13A for the undersides of the operating slides 8.Delivery chambers (not shown) between the operating slides 8, the rotor 6 and the cam ring 7 are in communication with an oil tank (not shown) via suction chambers 15, 15A and a suction connection 17. The compressed oil delivered by the slides 8 flows through the pressure openings 11, 1 1A into a pressure chamber 20 in communiccation with an outlet connection 18. Cast into the control plate 10 is a groove for a sealing ring 21. This sealing ring 21 encircles a certain pressure area on the control plate 10 acted upon by discharge pressure, thus preventing the control plate 10 from bending excessively under high pump pressures.
The discharge pressure acting upon the control plate 10 has the effect of equalizing the axial play as well as equalizing the inside pressure acting upon the control plate 10 from the side of the rotor.
The required wear resistance of the loose control plate 10 and of the control plate 4 forming an integral part with the housing 1 is achieved by the relatively high silicon content of 12 to 20%. Rapid cooling results in a fine separating out of silicon crystals creates a thin surface barrier with high wear resistance.
Despite the fact that these pump components have to be manufactured to very small tolerances, it is possible to utilize control plates or an integral control surface produced by vacuum die-casting without expensive finishing operations being required. Since the fiatness of the control plate can be within 0.1 mm in its unworked state, the machining allowance on the control surface may be kept to the minimum. Thus the surface retains its fine structure and thereby its wear resistance.
1. A high pressure pump comprising a housing, a cam ring mounted inside the housing, a rotary piston with radial slots fitted with movable operating slides in close contact with a cam ring, and at least one control plate of a silicon-rich alloy manufactured by a vacuum die-casting process.
2. A high pressure pump according to claim 1 in which the control of silicon-rich alloy plate is on the discharge side of the pump.
3. A high pressure pump according to claim 1 and 2, in which a side of the control plate facing a pressure chamber has a pressure area limited by a sealing ring.
4. A high pressure pump according to any preceding claim in which a control plate on the drive side of the pump is an integral part of the pump housing and manufactured by a vacuum die-casting process of a silicon-rich alloy.
5. A high pressure pump as herein described with reference to the drawing.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (5)
1. A high pressure pump comprising a housing, a cam ring mounted inside the housing, a rotary piston with radial slots fitted with movable operating slides in close contact with a cam ring, and at least one control plate of a silicon-rich alloy manufactured by a vacuum die-casting process.
2. A high pressure pump according to claim 1 in which the control of silicon-rich alloy plate is on the discharge side of the pump.
3. A high pressure pump according to claim 1 and 2, in which a side of the control plate facing a pressure chamber has a pressure area limited by a sealing ring.
4. A high pressure pump according to any preceding claim in which a control plate on the drive side of the pump is an integral part of the pump housing and manufactured by a vacuum die-casting process of a silicon-rich alloy.
5. A high pressure pump as herein described with reference to the drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2913419A DE2913419C2 (en) | 1979-04-04 | 1979-04-04 | high pressure pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2045869A true GB2045869A (en) | 1980-11-05 |
| GB2045869B GB2045869B (en) | 1983-02-09 |
Family
ID=6067345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8008372A Expired GB2045869B (en) | 1979-04-04 | 1980-03-12 | Rotary positive-displacement fluid-machines |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS55134780A (en) |
| AR (1) | AR218583A1 (en) |
| BR (1) | BR8002020A (en) |
| DE (1) | DE2913419C2 (en) |
| ES (1) | ES488724A1 (en) |
| FR (1) | FR2453293A1 (en) |
| GB (1) | GB2045869B (en) |
| IT (1) | IT1154060B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2780452A1 (en) * | 1998-06-24 | 1999-12-31 | Luk Fahrzeug Hydraulik | HYDRAULIC TRANSPORT DEVICE |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57147155A (en) * | 1981-03-09 | 1982-09-10 | Sony Corp | Sliding member |
| JPS57110787A (en) * | 1980-12-27 | 1982-07-09 | Kayaba Ind Co Ltd | Vane pump |
| JPS59188089A (en) * | 1983-03-31 | 1984-10-25 | Mazda Motor Corp | Rotating sleeve for rotary compressor |
| JPS6047887U (en) * | 1983-09-09 | 1985-04-04 | 株式会社ナブコ | Gear pump or motor side plate |
| JP2576979B2 (en) * | 1985-07-26 | 1997-01-29 | ツア−ンラトフアブリク フリ−トリツヒシヤフエン アクチエンゲゼルシヤフト | Vane pump |
| JPH0634634Y2 (en) * | 1987-11-09 | 1994-09-07 | カヤバ工業株式会社 | Vane pump |
| US5012219A (en) * | 1989-10-13 | 1991-04-30 | Motorola, Inc. | Message reminder alert for selective call receiver |
| JP2006002646A (en) | 2004-06-17 | 2006-01-05 | Kayaba Ind Co Ltd | Vane pump |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2020675C3 (en) * | 1970-04-28 | 1975-03-27 | Daimler-Benz Ag, 7000 Stuttgart | Pump unit consisting of a centrifugal or rotary piston pressure pump, volume control valve and oil reservoir for supplying pressure energy to motor vehicles |
| JPS51137103A (en) * | 1975-05-06 | 1976-11-26 | Hitachi Ltd | Oil pressure pump motor |
| DE2600734A1 (en) * | 1976-01-10 | 1977-07-14 | Schmidt Gmbh Karl | Air cooled trochoidal rotary piston engine casing end plate - has duct with good flow characteristics, and is castable without a core |
-
1979
- 1979-04-04 DE DE2913419A patent/DE2913419C2/en not_active Expired
-
1980
- 1980-02-19 ES ES488724A patent/ES488724A1/en not_active Expired
- 1980-03-12 GB GB8008372A patent/GB2045869B/en not_active Expired
- 1980-03-24 AR AR280419A patent/AR218583A1/en active
- 1980-03-25 JP JP3701380A patent/JPS55134780A/en active Granted
- 1980-04-01 BR BR8002020A patent/BR8002020A/en unknown
- 1980-04-02 IT IT46828/80A patent/IT1154060B/en active
- 1980-04-03 FR FR8007881A patent/FR2453293A1/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2780452A1 (en) * | 1998-06-24 | 1999-12-31 | Luk Fahrzeug Hydraulik | HYDRAULIC TRANSPORT DEVICE |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2913419C2 (en) | 1981-04-09 |
| AR218583A1 (en) | 1980-06-13 |
| JPH0243037B2 (en) | 1990-09-26 |
| IT8046828A0 (en) | 1980-04-02 |
| GB2045869B (en) | 1983-02-09 |
| FR2453293A1 (en) | 1980-10-31 |
| IT8046828A1 (en) | 1981-10-02 |
| DE2913419B1 (en) | 1980-09-11 |
| FR2453293B1 (en) | 1985-04-19 |
| BR8002020A (en) | 1980-11-25 |
| JPS55134780A (en) | 1980-10-20 |
| IT1154060B (en) | 1987-01-21 |
| ES488724A1 (en) | 1980-09-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19950312 |