WO2006066828A1 - Piston-cylinder arrangement for a reciprocating compressor - Google Patents
Piston-cylinder arrangement for a reciprocating compressor Download PDFInfo
- Publication number
- WO2006066828A1 WO2006066828A1 PCT/EP2005/013602 EP2005013602W WO2006066828A1 WO 2006066828 A1 WO2006066828 A1 WO 2006066828A1 EP 2005013602 W EP2005013602 W EP 2005013602W WO 2006066828 A1 WO2006066828 A1 WO 2006066828A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- piston
- fastening
- cylinder
- cylinder arrangement
- edge portion
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/0873—Component parts, e.g. sealings; Manufacturing or assembly thereof
- F04B27/0878—Pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
- F04B39/0022—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons piston rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
- F04B53/144—Adaptation of piston-rods
- F04B53/147—Mounting or detaching of piston rod
Definitions
- the present invention relates to a piston-cylinder arrangement for a
- Piston compressor in particular for a swash plate compressor, with a cylinder arranged in an axially movable piston made of light metal, which is fastened via at least one in the piston movement direction through a through bore of the piston extending through fastening screw frontally on a piston rod.
- the field of application of the present invention relates primarily to swash plate compressors, which represent a special form of reciprocating compressors for generating compressed air.
- Swash plate compressors are used, for example, in commercial vehicles. In commercial vehicles, these are usually driven directly by the engine of the commercial vehicle and supply the compressed air supply of the compressed air vehicle electrical system. In commercial vehicles, the compressed air thus generated is used for example for operating a compressed air brake system.
- EP 0 859 151 A2 discloses a swash plate compressor for generating compressed air in commercial vehicles, which is constructed here to run dry as far as possible.
- This has only a conventional oil-lubricated engine, which consists essentially of a arranged on a drive shaft swash plate with hemispheres in bearing cups, which form a bearing assembly for transmitting the rotational movement in an oscillating motion. From the bearing arrangement extending piston rods to various pistons, which generate the compressed air by a reciprocating motion in associated cylinders.
- a plurality of pistons are arranged adjacent to one another on a circumferential circle, in order to realize the highest possible delivery rate of the swash plate compressor.
- the usually made of a light metal piston are equipped with suitable for oil-free dry running piston rings, so that the piston moves without contact in the cylinder bore.
- the fastening of the light metal existing piston on the piston rod takes place here via a central fastening screw, which is coaxial with the piston rod and the longitudinal axis of the piston and comes into engagement with a corresponding threaded base bore on the piston facing the end face of the piston rod.
- the piston is provided with a through hole.
- an interposed washer is provided here.
- a disadvantage of this prior art solution is that the head of the fastening screw protrudes beyond the piston surface, so that a corresponding recess for receiving the head of the fastening screw is required on the part of the cylinder. Furthermore, the hot, compressed air flows around the head of the
- US 3,036,873 shows another solution for fixing a piston rod to the piston, in which the head of the fastening screw does not protrude beyond the piston surface by being housed in a corresponding countersinking of the piston.
- a washer assembly in two Execution, each consisting of a spring washer and a steel disc provided. This solution proves to be quite expensive to manufacture and assembly because of the many items.
- the invention includes the technical teaching that the through hole of the piston has a countersink, wherein a fastening bush is provided with an annular bottom portion and an adjacent hollow-cylindrical wall portion which projects into the countersink of the through hole for receiving the head of the fastening screw, and via a adjoining the wall region of the fastening bushing and extending radially outwardly edge region abuts the adjacent piston surface.
- the advantage of the solution according to the invention is, in particular, that it is hereby possible to completely countersink the head of the fastening screw. A supernatant is thus largely avoided.
- a sinking of the mounting screw in the material of the piston would not be possible because the required material thicknesses of the existing light metal piston would not ensure reliable attachment.
- the fastening screw does not heat up so much that the temperature differences associated therewith are no longer significant, and unwanted alternating voltages no longer occur. Rather, the connection point to the piston rod is thermally relieved by the cheaper compressed air supply.
- the mounting bush receiving reduction in the piston in the depth is made larger than the axial length of the mounting sleeve, so that an axial tolerance compensation takes place by tightening the mounting screw. Manufacturing-related component tolerances on the piston can thus be compensated in a simple manner while securing the screw.
- the fastening bushing can also be used for clamping at least one suction lamella on the piston by clamping the tongue-like suction lamella between the surface of the piston and the edge portion of the fastening bushing. Since the mounting bushing takes on a further function in this case, can be dispensed with separate attachment means for the Sauglamelle.
- the suction lamella acts at this point as a check valve when sucking in the compressed air. The sucked in compressed air is in this respect conveyed through the piston into the pressure chamber and compressed here.
- edge portion of the mounting bushing tapers in the thickness to create an opening angle for limiting the movement of the suction blade clamped here.
- the edge portion has an outer radial, rounded rolling edge.
- the rounded rolling edge serves to avoid fractures of the here clamped at least one suction lamella. Without this measure, the Danger that the suction plate is so bent due to the alternating stress occurring at the clamping point to the fastening bushing due to the opening and closing of the check valve that here a break occurs over time.
- the radially outwardly extending edge section of the fastening bushing should be arranged at an angle of ⁇ 90 ° to the hollow-cylindrical, adjacent wall section.
- Tolerance compensation allows, as the resilient edge area acts as a kind of spring washer. If the mounting bushing also serve for the clamping attachment of suction blades, the opening angle is ensured by the resilient edge portion.
- the existing steel mounting bushing is made by deep drawing, stamping and punching.
- this can be production technology produce in a very simple way.
- the mounting bushing has a thickness of 0.3 to 1.5 millimeters, preferably 0.5 to 1 millimeter, when used within a swash plate type compressor of conventional sizes. This relatively small thickness is sufficient to produce the advantages of the invention.
- the transition between the annular bottom portion to the adjacent cylindrical wall portion should be provided as well as the transition between the hollow cylindrical wall portion to the annular edge portion with a radius in the range of 0.5 to 1 millimeter. Radii in this range are sufficient to prevent cracking in the manufacture of the mounting bushing (deep drawing). Further measures improving the invention will be described in more detail below together with the description of a preferred embodiment of the invention with reference to FIGS. It shows:
- Fig.l a piston-cylinder unit of a swash plate compressor
- FIG. 2 shows a mounting bushing for fastening the piston to the piston rod of the piston-cylinder unit of FIG. 1 in the non-installed state
- FIG. 3 shows the mounting bushing of FIG. 1 in the installed state.
- the piston-cylinder arrangement shown here consists of a cylinder 1, in which a piston 2 is arranged axially back and forth movable.
- the piston 2 is made of aluminum here.
- the piston 2 is provided with an outer radial piston ring assembly 3 which is in contact with the inner wall of the cylinder 2.
- the piston 2 has a central through-bore 4, through which a fastening screw 5 extends. By means of the fastening screw 5 takes place a coaxial attachment of the piston 2 frontally on a piston rod 6.
- the piston rod 6 transmits an axial movement of the engine of the - not shown here - swash plate compressor.
- the serving for receiving the fastening screw 5 through hole 4 in the piston 2 is provided with a reduction.
- the countersink serves to receive a fastening bushing 7, which acts between the piston 2 and the fastening screw 5.
- the mounting bushing 7 is made of steel and thus supports the connection point between the fastening screw 5 and the piston 2 made of aluminum.
- the fastening bushing 7 also serves to clamp at least one suction lamella 8 on the piston 2. This clamping attachment is achieved by clamping the suction lamella 8 between the piston surface 9 and the fastening bushing 7.
- the suction blade 8 forms with a corresponding eccentric through hole 10 in Piston 2, a check valve, which serves to suck in air from the atmosphere through the piston. After compression of the air sucked in this way, it is discharged via an outlet valve 11 arranged on the front side of the cylinder.
- the fastening bushing 7 consists of an annular
- the mounting bush 7 of this embodiment is made of sheet steel having a thickness of 0.7 millimeters.
- the transition between the annular bottom portion 12 to the adjacent cylindrical wall portion 13 as well as the transition between the hollow cylindrical wall portion 13 is provided to the annular edge portion 14 with a radius of 0.6 millimeters.
- the mounting bush 7 receiving reduction in the piston 2 in the depth is made larger than the axial length of the mounting sleeve 7 in the relaxed state.
- the edge portion 14 of the mounting bush 7 is tapered in thickness to create a ⁇ ffhungswinkel 17 to limit the movement of the here clamped suction plate 8.
- the fastening bushing 7 thus serves, in addition to an improvement of the screw connection, also as a clamp fastening of the at least one suction lamella 8 on the piston 2.
- the invention is not limited to the above-mentioned preferred exemplary embodiment.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Compressor (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE502005004481T DE502005004481D1 (en) | 2004-12-20 | 2005-12-16 | PISTON CYLINDER ASSEMBLY FOR A PISTON COMPRESSOR |
EP05818221A EP1831562B1 (en) | 2004-12-20 | 2005-12-16 | Piston-cylinder arrangement for a reciprocating compressor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004061236A DE102004061236B3 (en) | 2004-12-20 | 2004-12-20 | Piston-cylinder arrangement for a reciprocating compressor |
DE102004061236.6 | 2004-12-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006066828A1 true WO2006066828A1 (en) | 2006-06-29 |
Family
ID=35825981
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/013602 WO2006066828A1 (en) | 2004-12-20 | 2005-12-16 | Piston-cylinder arrangement for a reciprocating compressor |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1831562B1 (en) |
AT (1) | ATE398731T1 (en) |
DE (2) | DE102004061236B3 (en) |
WO (1) | WO2006066828A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3036873A (en) * | 1961-09-13 | 1962-05-29 | Kimwood Machine Co | Piston and piston rod connection |
US3961868A (en) * | 1974-02-21 | 1976-06-08 | Thomas Industries, Inc. | Air compressor |
US5644969A (en) * | 1996-06-28 | 1997-07-08 | Thomas Industries Inc. | Wobble piston and cylinder arrangement |
EP0859151A2 (en) * | 1997-02-17 | 1998-08-19 | Hans Unger | Compressors, especially for compressed-air provision in a motor vehicle |
DE29906232U1 (en) * | 1998-04-10 | 1999-08-12 | Abac Aria Compressa S.P.A., Robassomero | compressor |
-
2004
- 2004-12-20 DE DE102004061236A patent/DE102004061236B3/en not_active Expired - Fee Related
-
2005
- 2005-12-16 AT AT05818221T patent/ATE398731T1/en not_active IP Right Cessation
- 2005-12-16 EP EP05818221A patent/EP1831562B1/en not_active Not-in-force
- 2005-12-16 WO PCT/EP2005/013602 patent/WO2006066828A1/en active IP Right Grant
- 2005-12-16 DE DE502005004481T patent/DE502005004481D1/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3036873A (en) * | 1961-09-13 | 1962-05-29 | Kimwood Machine Co | Piston and piston rod connection |
US3961868A (en) * | 1974-02-21 | 1976-06-08 | Thomas Industries, Inc. | Air compressor |
US5644969A (en) * | 1996-06-28 | 1997-07-08 | Thomas Industries Inc. | Wobble piston and cylinder arrangement |
EP0859151A2 (en) * | 1997-02-17 | 1998-08-19 | Hans Unger | Compressors, especially for compressed-air provision in a motor vehicle |
DE29906232U1 (en) * | 1998-04-10 | 1999-08-12 | Abac Aria Compressa S.P.A., Robassomero | compressor |
Also Published As
Publication number | Publication date |
---|---|
DE102004061236B3 (en) | 2006-08-31 |
DE502005004481D1 (en) | 2008-07-31 |
EP1831562B1 (en) | 2008-06-18 |
EP1831562A1 (en) | 2007-09-12 |
ATE398731T1 (en) | 2008-07-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2406494B1 (en) | Tappet | |
EP0840856B1 (en) | Pistom pump | |
EP3183149B1 (en) | Electric motor-pump assembly | |
DE102009054502A1 (en) | Motor-pump unit | |
EP1888918B1 (en) | Refrigeration compressor | |
WO2012004037A1 (en) | Tappet | |
WO2015090715A1 (en) | Outlet valve | |
DE102004048714A1 (en) | Radial piston pump | |
EP2646302B1 (en) | Motor-pump assembly | |
EP1929154B1 (en) | Piston pump | |
DE102008031848B4 (en) | piston compressor | |
EP1831562B1 (en) | Piston-cylinder arrangement for a reciprocating compressor | |
EP1537332B1 (en) | Motor/pump unit, particularly for anti-skid vehicle brake systems | |
EP1315906B1 (en) | Piston compressor comprising a crankshaft whose mass is dynamically compensated, in particular for rail vehicles (detachable compensatory mass) | |
DE102008040959B4 (en) | Tappet rotation lock of a high pressure fuel pump | |
EP2238349B1 (en) | Reciprocating compressor having a valve plate comprising a disk valve | |
WO2017055103A1 (en) | High-pressure pump | |
DE102006045897B4 (en) | Radial piston pump for high-pressure fuel supply | |
DE10351372A1 (en) | Compressor, especially for air conditioning unit of motor vehicle, has housing with holder constructed as separate component after fashion of hose clamp or clamping collar | |
DE102012212647A1 (en) | Dry running compressor | |
DE102006043187B3 (en) | Fluid pump, in particular high-pressure fuel pump for injection systems of internal combustion engines | |
EP4337859A1 (en) | Radial piston pump, and process for manufacturing a radial piston pump | |
EP4337860A1 (en) | Radial piston pump, and process for manufacturing a radial piston pump | |
EP2872778B1 (en) | High-pressure pump | |
WO2018197669A1 (en) | Coolant compressor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KN KP KR KZ LC LK LR LS LT LU LV LY MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2005818221 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 2005818221 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 2005818221 Country of ref document: EP |