GB2530560A - Fire ring for a piston of an internal combustion engine and method to manufacture a piston of an internal combustion engine - Google Patents
Fire ring for a piston of an internal combustion engine and method to manufacture a piston of an internal combustion engine Download PDFInfo
- Publication number
- GB2530560A GB2530560A GB1417032.8A GB201417032A GB2530560A GB 2530560 A GB2530560 A GB 2530560A GB 201417032 A GB201417032 A GB 201417032A GB 2530560 A GB2530560 A GB 2530560A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- fire ring
- section
- ring groove
- fire
- 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.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/02—L-section rings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
A piston 1 for an internal combustion engine is provided. The piston 1 comprises a fire ring groove 15 with a fire ring 21. The fire ring 21 has a closed horizontal base section 20 for contacting a fire ring shoulder 16 of the piston 1 and, in one piece, a closed vertical sealing section 22 for contacting an inner surface of a cylinder bore 2. The closed horizontal base section 20 and the closed verÂtical sealing section 22 comprise an L-shape cross-section. In an unmounted and unloaded state of the piston 1, the upper edge of the vertical sealing section 22 is slightly bent outwards, with respect to the lower edge of the vertical sealing section 22.
Description
I
Fire ring for a piston of an Internal combustion engine and method to manufacture a piston of an internal combustion engine The application refers to a fire ring for a piston of an internal combustion engine, to a method to manufacture a piston of an internal combustion engine, and to a piston of an internal com-bustion engine.
US 2,283,432 discloses a piston for an internal combustion engine with a piston head portion with a number of flexible latches for securing a piston fire ring. This configuration has never materialized in practice due to a number of problems. Fire rings are sometimes also called sealing rings, because they are intended to seal the crank shaft casing of the engine from the combustion chambers in its combustion cylinders.
: 20 It is an object of the application to provide a fire ring for a piston of an internal combustion engine, a method to manufacture a piston of an internal combustion engine, and a piston of an internal combustion engine which can be easily manufactured and assembled and which provides improved operation conditions. * .
* 25 These and other objects of the application are solved by the subject matter of the independ- * : * . ent claims. Further improvements are provided by the subject mailer of the dependent claims.
The application provides a fire ring for a piston for an internal combustion engine which com-prises a closed horizontal base section for contacting a fire ring shoulder of a piston. The term closed" refers to the uninterrupted shape of the fire ring which is different from the ma-jority of fire rings known in the area of combustion engines. The fire ring further comprises, in one piece, a closed vertical sealing section for contacting an inner surface of a cylinder bore, the closed horizontal base section and the closed vertical sealing section comprising an L-shape cross-section. This closed and uninterrupted shape provides a number of advantages, such as an improved sealing between the combustion chamber and the crankshaft housing of the combustion engine, as compared with pistons that are provided with a number of open fire rings. The design of the application results also in lower frictional forces, compared with the design of the conventional configurations with a number of open fire rings.
In order to improve the sealing between the combustion chamber and the crankshaft hous-ing of the combustion engine, the upper edge of the vertical sealing section is slightly bent outwards, with respect to the lower edge of the vertical sealing section, in an unmounted and unloaded state of the piston ring.
In a further embodiment, the fire ring comprises a vertical oil stripping section extending downwards from the horizontal base section. The vertical oil stripping section keeps engine oil away from hotter parts of the fire ring, thereby providing improved operating conditions of the internal combustion engine. In order to improve the oil stripping properties of the fire ring, the lower edge of the vertical oil stripping section is slightly bent outwards, with respect to the upper edge of the vertical oil stripping section, in an unmounted and unloaded state of the piston ring.
* . .*** * * * . A fire ring with a vertical fire ring press-fit section at an inner edge of the horizontal base sec-tion provides a simple and yet reliable means for securing the fire ring on the piston head.
* . The fire ring can be slipped onto a recessed piston head portion until its base section abuts * * a lower fire ring shoulder of the piston. A tight press-fit between the radial surface of the re-cessed piston head portion and the ring-like vertical fire ring press-fit section prevents the fire ring from becoming lose upon a downward movement of the piston, especially during a suction phase of the internal combustipn engine.
The application also provides a piston with a piston ring as explained above, wherein the pis- ton ring is provided in a fire ring groove of the piston such that -in an unmounted and un-loaded state of the piston -the upper edge of the vertical sealing section slightly protrudes outwards, with respect to the outer circumference of the piston body portion immediately be- low the fire ring groove. Such a piston ring receives a pre-determined pre-load upon mount-ing the piston into the cylinder bore of an internal combustion engine, which improves the sealing between the combustion chamber and the crankshaft chamber.
In the case of providing a piston ring with an oil stripping section, it is advantageous to pro-vide it such that -in an unmounted and unloaded state of the piston -the lower edge of the vertical oil stripping section slightly protrudes outwards with respect to the outer circumfer-ence of the piston body portion immediately below the fire ring groove. The pre-load on the oil stripping section upon mounting the piston into the cylinder bore of an internal combustion engine improves its oil stripping function during operation. The oil stripping function during operation can be improved further by providing one or more internal oil channels extending between a piston rod clearance section and an outer surface of the piston body section be-low the fire ring groove. During a downward movement of the piston in a suction phase of the operation of the internal combustion engine, the crankshaft housing pressure urges the oil stripping section of the fire ring towards the cylinder bore and improves the contact be-tween the outer edge of the oil stripping section and the inner surface of the cylinder bore.
According to another embodiment of the application, a piston for an internal combustion en-gine comprises a piston body portion and a piston head portion, wherein the piston head S...
portion has a circular fire ring groove between a flexible fire ring section and a central piston head portion. The circular fire ring groove extends in axial direction of the piston downwards from the upper surface of the piston head portion, wherein the flexible fire ring portion and the central piston head section form one single piece of material. This piston is easy to man-ufacture, as the piston is formed as one single piece and the fire ring groove is cut into the piston head section, thereby providing the flexible fire ring section.
*. *30 The application, according to another embodiment, further provides a piston with a piston body portion with a piston pin boss and with a recessed piston head portion, wherein the pis-ton body portion comprises a circular fire ring groove between the piston body portion and the piston head portion. The recessed piston head section allows for accommodating a fire ring according to the application in the circular fire ring groove, the fire ring being provided with a continuously closed shape, i.e. not split, fire ring, and with a circular oil control ring groove below the fire ring groove. The inner circumference of the L-shaped fire ring is sub-stantially smaller than the outer circumference of the piston body portion immediately below the fire ring groove and the outer circumference of the piston head immediately above the fire ring groove. Different from the piston of the US 2,283,432, the piston of the application provides rigid and uniform surfaces immediately above and below the fire ring grove. The term substantially" is to be understood such that a pure deformation is not sufficient for un-locking the fire ring from the fire ring groove, which means also that the final shape of the piston is formed around the pre-existing fire ring.
One of the various methods for manufacturing such a piston for an internal combustion en-gine comprises a forging process, wherein a piston blank with a first shoulder of a fire ring groove is provided. A closed fire ring is provided on the first shoulder of the fire ring groove, and a second shoulder of the fire ring groove is made by forging a vertically protruding piston blank section such that the fire ring is axially enclosed between the first shoulder and the second shoulder of the fire ring groove. The result of the forging process can be improved if the piston blank is taken up in a forging die or in a swage. Another way of improving the re-suit of the forging process is to position one or more circular core elements in areas between the piston blank and the fire ring.
An alternative method for manufacturing a piston for an internal combustion engine com-prises a casting process wherein a piston casting mold with a first casting shoulder of a fire ring groove is provided. A fire ring assembly is positioned on the first casting shoulder, the fire ring assembly comprising a closed fire ring with at least one circular fire ring groove core element, securing the fire ring. Molten metal is poured into the piston casting mold, thereby providing a piston body and a piston head, wherein the piston body comprises a circular fire * ring groove with a fire ring grove such that the fire ring is axially enclosed between a first shoulder and a second shoulder of the fire ring groove.
For the sake of completeness, the application further provides an internal combustion engine wherein a crank of a crankshaft is provided with a piston according to the application, and also a vehicle with such an internal combustion engine, wherein the internal combustion en-gine is integrated into a powertrain assembly of the vehicle.
In other words, the application provides a blow by effect reduction and engine performance improvement by replacing the conventional sealing rings with a new closed shape of rings and pistons. It consists on a different piston sealing ring; this is made by an only one sealing ring which can have an L-shape and without split, namely as a closed ring.
The effect of the L-ring shape is that its behavior on the top region is more elastic respect that with rectangular shape, working in elastic range of material, and due to this shape it al- lows its sealing capacity without radial preload, leaving the task to the forces by gas pres-sure. The ring is filled in the piston without clearance between sealing ring and piston. This allows to eliminate the inertia effect and the vertical movement and the double vertical back-ing effect.
The closed ring shape also allows a great reduction of blow-by effect. The assembly is done by pulling the sealing ring, steel, as an insert directly into the piston casting. A second ring insert, which will then be removed after casting process, is put to create the space on the in-ternal side of the sealing ring, with crown shape, that it is needed for gas pressure working.
In case of a steel forged piston, it is possible to create this feature directly on the piston edge, without any sealing ring, creating a circular groove like this one showed with one seal-e.
ing ring. *n.fl * .
* 25 Apart from the blow-by reduction, the frictions reduction, the fuel and oil consumption reduc-tion, and the reciprocating masses reduction, a more compact and simplest piston shape * with only I sealing ring is provided. There is an engine performance improvement due to en-trapment efficiency improvement and leakage reduction. If there is no clearance between -**** sealing ring and piston, there is no inertia effect and no vertical movement and double verti-* .* cal backing effect.
What follows is a crankcase pressure reduction which results in a fuel evaporation capacity improvement from oil sump.
In another embodiment, a piston sealing ring is made by an only one sealing ring with double L-shape and without split, i.e. a closed ring. This ring in the lower part of his drawing inte-grates also the effect of the oil control ring that it hasn't needed more.
This shape allows also its working when the pressure below the piston, i.e. the pressure up-per of this, and works always exploiting the elastic behavior of the steel ring. A low preload allows a correct sealing also when there is not enough delta pressure.
The assembly is provided by pulling the sealing ring, steel, as an insert directly into the pis-ton casting. A second and third ring insert that will then be removed after casting process is provided to create the space on the internal side of the sealing ring with crown shape, that is needed for gas pressure working.
A small oil channel is provided to drain the oil collected from the lower surface of the ring to the pin piston.
According to a preferred embodiment, the fire ring can be made of a titanium alloy such as Ti-6A1-4V. Further, the fire ring can comprise a coating of titanium carbide (Tic).
Preferably, a ring material is selected that comprises a high hardness to reduce wear.
According to an aspect of the invention, a fire ring can be provided that comprises a thin sec-tion profile to ensure elastic behavior.
According to a preferred embodiment, the ring material comprises a low Young's modulus *....: 25 for low bending stress and a high fatigue and yield strength.
Further, according to a preferred embodiment, the ring is made of a material with a thermal expansion coefficient that allows to compensate the different work temperature and different thermal expansion between bore and ring. fl. * .30
Further, according to an embodiment, a fire ring is provided that comprises a good wear and thermal resistance.
Preferably the fire ring comprises refractory properties to reduce working temperature and* thermal stress.
The subject matter of the application is now explained in greater detail with respect to the ac-companying figures.
Fig. I shows a cross-section through a piston/cylinder assembly of an embodiment of an internal combustion engine, Fig. 2 shows a cross-section through a fire ring groove with an inserted fire ring of the pistorilcylinder assembly of Fig. I, Fig. 3 shows a cross-section through a fire ring groove with an inserted fire ring, to- gether with a mold core, in an intermediate state while manufacturing the pis-tonof Fig. 1, Fig. 4 shows a cross-section through a piston/cylinder assembly of another embodi-ment of an internal combustion engine, Fig. 5 shows a cross-section through a fire ring groove and the integrated fire ring of the piston/cylinder assembly of Fig. 4, Fig. 6 shows a cross-section through a piston/cylinder assembly of another embodi-ment of an internal combustion engine, 0** * * Fig. 7 shows a cross-section through a fire ring groove with an inserted fire ring of the piston/cylinder assembly of Fig. 6, * S * r *: Fig. 7 shows a cross-section through the fire ring of the piston/cylinder assembly of Fig.6, Fig. 9 shows a cross-section through a fire ring groove with an inserted fire ring, to- gether with a mold core, in an intermediate state white manufacturing the pis-ton of Fig. 6, and Fig. 10 shows a cross-section through a piston/cylinder assembly of another embodi-ment of an internal combustion engine.
The subject matter of the application is now explained in greater detail with respect to the ac-companying figures, whereby the same reference numeral is used to indicate parts of the various embodiments that have the same or similar functions. Prime symbols are used to as sign the individual reference numerals to individual embodiments.
Fig. 1 shows a cross-section through a piston 1 which is located in a cylinder bore 2 of a cyl-inder 3 of an internal combustion engine, which is integrated into a power train assembly of a vehicle, which are not shown here.
The piston 1 comprises a cylindrical piston body portion 5 with a circumferentially recessed cylindrical piston head section 6, wherein the piston body portion 5 is provided with a lateral piston pin boss section 7 for taking up a piston pin which is not shown here. The piston pin boss section 7 is split into two by a central piston rod clearance section 10. The piston head section 6 comprises a central axial combustion cavity 8, and the circumference of the piston body portion 5 provides a piston skirt 9.
The piston 1 comprises, at the upper portion of the piston body portion 5, a circular oil con-trol ring groove 11 with an oil control ring 12.
S.....
* A circular fire ring groove 15 is provided at the piston head section 6, just above the piston body section 5. The fire ring groove 15 comprises a lower fire ring groove shoulder 16 and S...
* an fire ring groove shoulder 17, which enclosed a horizontal base section 20 of a fire ring 21.
S..... * S
* As one can be best seen in Fig. 2, which shows a cross-section through the fire ring groove *. . 15 with the inserted fire ring 21 of the piston 1/cylinder 3 assembly of Fig. 1, the fire ring 21 has a vertical sealing section 22, which extends upwards from the outer edge of the horizon-tal base section 21. Small arrows explain the pressure that is exerted on the fire ring 21 upon combusting fuel in the combustion cavity 8 of the internal combustion engine, and how this pressure supports the sealing of the fire ring 21 during operation.
Fig. 3 shows a cross-section through the fire ring groove 15 with the inserted fire ring 21, to- gether with a mold core 25 and a section of a mold 26, in an intermediate state while manu-facturing the piston I of Fig. 1.
As one cannot see here, in an unmounted and unloaded state of the piston 1, the upper edge of the vertical sealing section 22 is slightly bent outwards, with respect to the lower edge of the vertical sealing section 22.
Fig. 4 shows a cross-section through a piston 1/cylinder 3 assembly of another embodiment of an internal combustion engine. A circular axial recess serves as a fire ring groove 15', which separates an axial flexible sealing tongue, serving as an integrated fire ring 21', from the central area of the piston head section 6'.
As one can be best seen in Fig. 5, which shows a cross-section through the fire ring groove 15' and the integrated fire ring 21' of the piston I icylinder 3' assembly of Fig. 4, the fire ring 21 has a vertical sealing section 22', which is flexibly connected with the piston body portion 5'. Small arrows explain the pressure that is exerted on the fire ring 21' upon combusting fuel in the combustion cavity 8' of the internal combustion engine, and how this pressure supports the sealing of the fire ring 21' during operation. Dotted lines indicate the position of the flexible integrated fire ring 21' in a state before the piston 1' is mounted into the cylinder 3'. S *
S
* *fl..
* As one can further see here, in an unmounted and unloaded state of the piston 1', the upper **** *25 edge of the vertical sealing section 22' is slightly bent outwards, with respect to the lower * edge of the vertical sealing section 22'.
S..... * .
* Fig. 6 shows a cross-section through a piston 1 "Icylinder 3" assembly of another embodi- * ment of an internal combustion engine. A plurality of internal oil channels 30" extend be-tween the piston rod clearance section 10" and an outer surface of the piston body section 5" below the fire ring groove 15".
The fire ring 21" comprises a vertical oil stripping section 12" extending downwards from the horizontal base section 20".
Fig. 7 shows a cross-section through a fire ring groove with an inserted fire ring of the pis-ton/cylinder assembly of Fig. 6.
Small arrows at the vertical sealing section 22" explain the pressure that is exerted on the vertical sealing section 22" of the fire ring 21" upon combusting fuel in the combustion cav-ity 8" of the internal combustion engine, and how this pressure supports the sealing of the fire ring 21" during operation.
Small arrows at the oil stripping section 12" illustrate that, during a downward movement of the piston 1" in a suction phase of the operation of the internal combustion engine, the crankshaft housing pressure urges the oil stripping section 12" of the fire ring 21" towards the cylinder bore 2" and improves the contact between the outer edge of the oil stripping section 12" and the inner surface of the cylinder bore 2".
Fig. 8 shows a cross-section through the fire ring 21" of the piston 1"/cylinder 3" assem-bly of Fig. 6. A dotted line indicates the position of the outer boundary of the flexible fire ring 21" in a state after the piston 1" being mounted into the cylinder 3".
As one can see here, the lower edge of the vertical oil stripping section 12" is slightly bent outwards, with respect to the upper edge of the vertical oil stripping section 12", in an un-mounted and unloaded state of the piston ring. S... : 25 * *
* Fig. 9 shows a cross-section through a fire ring groove with an inserted fire ring, together with an upper mold core 25" and with a lower mold core 35", in an intermediate state while manufacturing the piston I icylinder 3" assembly of Fig. 6. The upper mold core 25" and the lower mold core 35" are removed in a later state of the manufacturing the piston 1 "/cyl-inder 3" assembly.
Fig. 10 shows a cross-section through a piston I "/cylinder 3" assembly of another embod- iment of an internal combustion engine. A fire ring 21 " has a vertical fire ring press-fit sec-tion 40" at an inner edge of the horizontal base section 20" for securing the fire ring 21" on the piston head portion 5".
*..... * * * S... * .
*...*. * * * S * .*
Reference number list 1,l.,1",l." piston 2, 2" cylinder bore 3, 3', 3", 3" cylinder 5, 5", 5" piston body portion 6, 6' piston head section 7 piston pin boss section 8, 8', 8" combustion cavity 9 piston skirt 10, 10" clearance section 11 oil control ring groove 12 oil control ring 12" vertical oil stripping section 15, 15', 15" fire ring groove 16 lower fire ring grove shoulder 17 upper fire ring groove shoulder 20, 20", 20" horizontal base section 21,21',21",21"' firering 22, 22', 22" vertical sealing section mold core 25" uppermoldcore 26 mold 30" plurality of internal oil channels 35" lowernioldcore * 40" vertical fire ring press-fit section
Claims (14)
- Patent Claims 1. Fire ring, comprising a closed horizontal base section for contacting a fire ring shoulder of a piston, the fire ring further comprising, in one piece, a closed vertical sealing sec- tion for contacting an inner surface of a cylinder bore, the closed horizontal base sec-tion and the closed vertical sealing section comprising an L-shape cross-section, wherein the upper edge of the vertical sealing section is slightly bent outwards, with respect to the lower edge of the vertical sealing section.
- 2. Fire ring according to claim 1, comprising a vertical oil stripping section extending downwards from the horizontal base section, wherein the lower edge of the vertical oil stripping section is slightly bent outwards, with respect to the upper edge of the vertical oil stripping section.
- 3. Fire ring according to claims I or 2, comprising a vertical fire ring pressfit section at an inner edge of the horizontal base section.
- 4. Piston with a piston ring according to one of claims Ito 3, the piston ring being pro-vided in a fire ring groove of the piston such that the upper edge of the vertical sealing section slightly protrudes outwards, with respect to the outer circumference of the pis-ton body portion immediately below the fire ring groove. * .
- 5. Piston with a piston ring according to claim 2, the piston ring being provided in a fire ring groove of the piston such that the lower edge of the vertical oil stripping section *.**** slightly protrudes outwards, with respect to the outer circumference of the piston body portion immediately below the fire ring groove. *. * S * * * **
- 6. Piston according to claim 5, with at least one oil channel extending between a piston rod clearance section and an outer surface of the piston body section.
- 7. Piston1 comprising a piston body portion and a recessed piston head portion, wherein the piston body portion comprises a circular fire ring groove between the piston body portion and the piston head portion, the circular fire ring groove comprising a closed fire ring, wherein the inner circumference of the L-shaped fire ring is substantially smaller than the outer circumference of the piston body portion immediately below the fire ring groove and the outer circumference of the piston head immediately above the fire ring groove.
- 8. Piston1 comprising a piston body portion and a piston head portion, wherein the piston head portion comprises a circular fire ring groove between a flexible fire ring section and a central piston head portion, the circular fire ring groove extending in axial direc-tion of the piston downwards from the upper surface of the piston head portion, wherein the flexible fire ring portion and the central piston head section form one single piece of material.
- 9. Internal combustion engine wherein a crank of a crankshaft is provided with a piston according to one of claims 4 to 8.
- 10. Vehicle with an internal combustion engine according to claim 9, wherein the internal combustion engine is integrated into a powertrain assembly of the vehicle.
- 11. Method, comprising -providing a piston blank with a first shoulder of a fire ring groove, -providing a closed fire ring on the first shoulder of the fire ring groove, -providing a second shoulder of the fire ring groove by forging a (vertically) pro-truding piston blank section such that the fire ring is (axially) enclosed between the first shoulder and the second shoulder of the fire ring groove.*
- 12. Method according to claim 11, wherein the piston blank is taken up in a forging die. * °30
- 13. Method according to claim 11 or claim 12, wherein a circular core element is provided in an area between the piston blank and the fire ring.
- 14. Method, comprising -providing a piston casting mold with a first casting shoulder of a fire ring groove, -providing a fire ring assembly on the first casting shoulder, the fire ring assembly comprising a closed fire ring with at least one fire ring groove core element, -providing molten metal into the piston casting mold, thereby providing a piston body and a piston head, wherein the piston body comprises a circular fire ring groove with a fire ring grove such that the fire ring is enclosed between a first shoulder and a second shoulder of the fire ring groove. 0e**S..... * * *.. * * S...* * ...* * . * *.*..* * . *. . * I * S **
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1417032.8A GB2530560A (en) | 2014-09-26 | 2014-09-26 | Fire ring for a piston of an internal combustion engine and method to manufacture a piston of an internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1417032.8A GB2530560A (en) | 2014-09-26 | 2014-09-26 | Fire ring for a piston of an internal combustion engine and method to manufacture a piston of an internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201417032D0 GB201417032D0 (en) | 2014-11-12 |
| GB2530560A true GB2530560A (en) | 2016-03-30 |
Family
ID=51901187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1417032.8A Withdrawn GB2530560A (en) | 2014-09-26 | 2014-09-26 | Fire ring for a piston of an internal combustion engine and method to manufacture a piston of an internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2530560A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB593669A (en) * | 1945-06-21 | 1947-10-22 | Alpheus Flower | Piston sealing means |
| GB651618A (en) * | 1948-10-01 | 1951-04-04 | Roland Claude Cross | Improvements in piston rings and in piston, cylinder and piston ring assemblies |
| US4240644A (en) * | 1977-04-27 | 1980-12-23 | Gemini Seals, Inc. | Piston seal |
| JP2003161260A (en) * | 2001-11-26 | 2003-06-06 | Tokico Ltd | Reciprocating compressor |
| US20060193735A1 (en) * | 2005-02-28 | 2006-08-31 | Tatsuya Suzuki | Oscillating type compressor |
| EP1835178A1 (en) * | 2006-03-18 | 2007-09-19 | Pfeiffer Vacuum GmbH | Sealing assembly for a piston type vacuum pump |
| JP2009013795A (en) * | 2007-06-29 | 2009-01-22 | Hitachi Ltd | Reciprocating compressor |
-
2014
- 2014-09-26 GB GB1417032.8A patent/GB2530560A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB593669A (en) * | 1945-06-21 | 1947-10-22 | Alpheus Flower | Piston sealing means |
| GB651618A (en) * | 1948-10-01 | 1951-04-04 | Roland Claude Cross | Improvements in piston rings and in piston, cylinder and piston ring assemblies |
| US4240644A (en) * | 1977-04-27 | 1980-12-23 | Gemini Seals, Inc. | Piston seal |
| JP2003161260A (en) * | 2001-11-26 | 2003-06-06 | Tokico Ltd | Reciprocating compressor |
| US20060193735A1 (en) * | 2005-02-28 | 2006-08-31 | Tatsuya Suzuki | Oscillating type compressor |
| EP1835178A1 (en) * | 2006-03-18 | 2007-09-19 | Pfeiffer Vacuum GmbH | Sealing assembly for a piston type vacuum pump |
| JP2009013795A (en) * | 2007-06-29 | 2009-01-22 | Hitachi Ltd | Reciprocating compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201417032D0 (en) | 2014-11-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |