EP1540200A2 - Piston elliptique de ressort pneumatique - Google Patents
Piston elliptique de ressort pneumatiqueInfo
- Publication number
- EP1540200A2 EP1540200A2 EP03759325A EP03759325A EP1540200A2 EP 1540200 A2 EP1540200 A2 EP 1540200A2 EP 03759325 A EP03759325 A EP 03759325A EP 03759325 A EP03759325 A EP 03759325A EP 1540200 A2 EP1540200 A2 EP 1540200A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- air spring
- sleeve
- stress distribution
- elliptical
- 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.)
- Withdrawn
Links
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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
- F16F9/04—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall
- F16F9/05—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall the flexible wall being of the rolling diaphragm type
-
- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
- F16F9/04—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall
- F16F9/05—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall the flexible wall being of the rolling diaphragm type
- F16F9/057—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall the flexible wall being of the rolling diaphragm type characterised by the piston
Definitions
- the invention relates to an air spring and more particularly, to an air spring having a piston with an elliptical outer surface to cause a uniform stress distribution in an air spring sleeve.
- a stress along the x axis of the spring is different than a stress in the y axis.
- greater end cap tilt angles for greater side load compensation result in higher non-uniform stress distribution and lower durability.
- the durability of the air spring sleeve is reduced by the elliptical or non-unifqrm stress distribution. The more non-uniform the stress distribution, the more durability is reduced. Representative of the art is U.S. patent no. 5752692
- the prior art air spring causes an elliptical, non- uniform stress distribution in the sleeve which shortens an operating life.
- the primary aspect of the invention is to provide a side-load compensating air spring piston having an elliptical cross-section.
- Another aspect of the invention is to provide a side-load compensating air spring having a sleeve with a substantially uniform stress distribution in a rolling lobe .
- the invention comprises a side load compensating air spring piston having an elliptical cross-section.
- the side load compensating air spring comprises an air spring sleeve forming a chamber and having a rolling lobe. One end of the sleeve is attached to a tilted end cap for side load compensation. The other end of the sleeve has a rolling lobe engaged with a piston elliptical outer surface.
- the piston elliptical outer surface is disposed at a 90° angle to an elliptical stress distribution in the sleeve, thereby rendering the stress distribution uniform in the sleeve rolling lobe portion as it rolls on the piston.
- Fig. la is a cross-sectional view of a prior art air spring.
- Fig. lb is a plan view of a prior art piston cross- section.
- Fig. lc is a plan view of a prior art air spring sleeve stress distribution.
- Fig. 2a is a cross-sectional view of an inventive piston.
- Fig. 2b is a plan view of an inventive piston cross- section B-B, and sleeve uniform stress distribution.
- Fig. 2c is a plan view of a sleeve elliptical stress distribution.
- Fig. la is a cross-sectional view of a prior art air spring.
- Air spring 100 comprises flexible sleeve 10.
- Sleeve 10 is air tight and forms a chamber that is attached at one end to a tilted end cap 11.
- Sleeve 10 is attached to the end cap by crimp ring 110 or other suitable means known in the art.
- End cap 11 is round in plan.
- End cap 11 is tilted by angle ⁇ to compensate for a side load imposed upon the air spring.
- Angle ⁇ is the angle between an end cap plane and a normal to a piston major axis A-A.
- Sleeve 10 is constructed of elastomeric materials and in a manner known in the art.
- Sleeve 10 also comprises cords wound helically within the elastomeric material. A helix angle of the helically wound cord need not be limited to a particular range in order to achieve the benefits of the
- the other end 13 of the sleeve 10 is attached to a piston 20.
- Sleeve 10 is attached to the piston by crimp ring or other suitable means known in the art.
- sleeve 10 forms a rolling lobe 15 on an outer surface 16 of piston 20. Rolling lobe 15 rolls along a length of outer surface 16 of piston 20 during operation of the air spring.
- Fig. lb is a plan view of a prior art piston cross- section.
- Outer surface 16 has a circular cross-section. Since end cap 11 is tilted and therefore not parallel to a piston plane that is normal to a major axis, sleeve 10 has a substantially elliptical stress distribution 17. The elliptical stress distribution can manifest as wrinkles appearing on the sleeve during compression strokes which reduce an operating life.
- Fig. lc is a plan view of a prior art air spring sleeve stress distribution.
- Fig. 2a is a cross-sectional view of an inventive piston.
- Piston 140 comprises outer surface 160.
- the other components are as described in Fig. la.
- Outer surface 160 describes a substantially elliptical shape when viewed along an axis A-A.
- Outer surface 160 may be an integral part of piston 140.
- Outer surface 160 may also comprise an outer shroud 161 that is attached to piston 140.
- Fig. 2a depicts an outer shroud 161 having an elliptical outer surface 160.
- Sleeve 10 has an elliptical stress distribution due to the tilted end cap 11 as described elsewhere herein.
- Fig. 2c is a plan view of a sleeve elliptical stress distribution.
- the sleeve elliptical stress distribution has a major axis on the y-axis and a minor axis on the x- axis .
- Fig. 2b is a plan view of an inventive piston cross- section B-B, and sleeve uniform stress distribution.
- the elliptical cross-section of outer surface 160 is rotated approximately 90° to the orientation of the elliptical stress distribution in the sleeve. Namely, the outer surface 160 has a major axis on the x-axis and the minor axis on the y-axis.
- the elliptical stress distribution in sleeve 10 becomes substantially uniform or in the instant case, substantially circular 170.
- the uniform substantially circular stress distribution 170 in sleeve 10 significantly increases the durability of the sleeve.
- the stress distribution may have a form other than circular and yet remain uniform.
- a ratio between the major axis length and the minor axis length of outer surface 160 is selected in order to establish a substantially uniform, or in the instant example circular, stress distribution in sleeve 10.
- the ratio of the lengths of the major axis and minor axis is dependent upon the degree of side load compensation, namely end cap tilt ⁇ .
- a tilt angle ⁇ of the end cap is zero and the ratio is 1.0 - a circle.
- the ratio is approximately 1.2.
- a side-load compensating air spring sleeve was tested on an elliptical air spring piston having a ratio of approximately 1.08.
- the operating life of the tested sleeve was approximately five (5) times longer than the operating life of an identical sleeve mounted on a piston having a circular cross section.
- the end cap tilt angle ⁇ was approximately seven (7) degrees.
- Ratios for the inventive air spring piston are in the range of approximately 1.0 to 1.5 for end cap tilt angles ⁇ in a range of approximately 0° to 20°.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
L'invention porte sur un piston de ressort pneumatique de compensation des charges latérales, de section transversale elliptique, dont la membrane du ressort pneumatique constitue une chambre à lobe roulant. L'une des extrémités de la membrane est fixée à une calotte inclinée pour compenser les charges latérales, tandis que son autre extrémité forme un lobe roulant fixé à la surface supérieure elliptique du piston. Cette dernière fait un angle de 90° avec la distribution elliptique des contraintes dans la membrane, de manière à uniformiser la distribution des contraintes dans le lobe roulant se déplaçant le long du piston.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US41247202P | 2002-09-20 | 2002-09-20 | |
US412472P | 2002-09-20 | ||
PCT/US2003/029616 WO2004027283A2 (fr) | 2002-09-20 | 2003-09-17 | Piston elliptique de ressort pneumatique |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1540200A2 true EP1540200A2 (fr) | 2005-06-15 |
Family
ID=32030878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03759325A Withdrawn EP1540200A2 (fr) | 2002-09-20 | 2003-09-17 | Piston elliptique de ressort pneumatique |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1540200A2 (fr) |
JP (1) | JP2006500525A (fr) |
KR (1) | KR20050084569A (fr) |
AU (1) | AU2003275059A1 (fr) |
BR (1) | BR0314621A (fr) |
CA (1) | CA2498715A1 (fr) |
TW (1) | TWI225128B (fr) |
WO (1) | WO2004027283A2 (fr) |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1150889B (de) * | 1958-04-16 | 1963-06-27 | Continental Gummi Werke Ag | Verbindung eines an seinen Enden offenen Luftfederbalges mit seinem Befestigungs-koerper, insbesondere bei Luftfederungen von Fahrzeugen |
JPS56143832A (en) * | 1980-04-11 | 1981-11-09 | Bridgestone Corp | Air cushion |
US5129634A (en) * | 1986-09-02 | 1992-07-14 | The Goodyear Tire & Rubber Company | Airspring with partial restraining sleeve |
JP2662218B2 (ja) * | 1987-04-03 | 1997-10-08 | 株式会社ブリヂストン | 空気ばね |
US5180144A (en) * | 1991-09-03 | 1993-01-19 | General Motors Corporation | Air spring module for a damper |
CA2065946A1 (fr) * | 1992-01-22 | 1993-07-23 | James Klassen | Ressort a gaz a force constante |
DE19642024B4 (de) * | 1996-10-11 | 2006-02-09 | Bayerische Motoren Werke Ag | Rollbalg-Gasfeder mit einem Außenstützteil |
US5752692A (en) | 1997-01-06 | 1998-05-19 | The Gates Corporation | Side load compensating airspring strut |
DE10024983C1 (de) * | 2000-05-19 | 2001-10-31 | Mannesmann Sachs Ag | Querkraftkompensation bei Luftfederbeinen |
-
2003
- 2003-09-17 CA CA002498715A patent/CA2498715A1/fr not_active Abandoned
- 2003-09-17 AU AU2003275059A patent/AU2003275059A1/en not_active Abandoned
- 2003-09-17 WO PCT/US2003/029616 patent/WO2004027283A2/fr not_active Application Discontinuation
- 2003-09-17 EP EP03759325A patent/EP1540200A2/fr not_active Withdrawn
- 2003-09-17 KR KR1020057004842A patent/KR20050084569A/ko not_active Application Discontinuation
- 2003-09-17 BR BR0314621-9A patent/BR0314621A/pt not_active IP Right Cessation
- 2003-09-17 JP JP2004538293A patent/JP2006500525A/ja active Pending
- 2003-09-19 TW TW092125894A patent/TWI225128B/zh not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2004027283A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2004027283A2 (fr) | 2004-04-01 |
WO2004027283A3 (fr) | 2004-05-21 |
BR0314621A (pt) | 2005-07-26 |
AU2003275059A8 (en) | 2004-04-08 |
CA2498715A1 (fr) | 2004-04-01 |
TWI225128B (en) | 2004-12-11 |
JP2006500525A (ja) | 2006-01-05 |
KR20050084569A (ko) | 2005-08-26 |
AU2003275059A1 (en) | 2004-04-08 |
TW200406551A (en) | 2004-05-01 |
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Legal Events
Date | Code | Title | Description |
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17P | Request for examination filed |
Effective date: 20050304 |
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AX | Request for extension of the european patent |
Extension state: AL LT LV MK |
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DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20060301 |