US20010006135A1 - Dashpot with two cylinders - Google Patents
Dashpot with two cylinders Download PDFInfo
- Publication number
- US20010006135A1 US20010006135A1 US09/751,003 US75100300A US2001006135A1 US 20010006135 A1 US20010006135 A1 US 20010006135A1 US 75100300 A US75100300 A US 75100300A US 2001006135 A1 US2001006135 A1 US 2001006135A1
- Authority
- US
- United States
- Prior art keywords
- base
- inner cylinder
- dashpot
- cylinders
- outer cylinder
- 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
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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
- 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
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3235—Constructional features of cylinders
Definitions
- the present invention concerns a dashpot with two cylinders.
- Two-cylinder dashpots of this genus are preferred for eliminating the vibrations that occur between a vehicle and its wheels.
- Such absorbers generally comprise two loosely concentric cylinders, the gap between them occupied by a cushion of gas that compresses to accommodate the gas forced in by a piston rod that slides in and out to various extents.
- the object of the present invention is accordingly a simple and reliable means of attaching the outer cylinder to the inner cylinder of such a dashpot.
- the major advantage of the present invention is that the outer cylinder is reliably secured to the inner cylinder. Furthermore, however, the means of attachment are simple, which considerably decreases the cost of manufacture.
- FIG. 1 is a section through a dashpot with two cylinders
- FIG. 2 illustrates another version of the dashpot
- FIG. 3 is a larger-scale illustration of the base of a dashpot
- FIG. 4 illustrates another version of the base illustrated in FIG. 3.
- a dashpot comprises an inner cylinder 3 centered inside an outer cylinder 1 with a cylindrical gap 2 left between them.
- Outer cylinder 1 is provided with a base 4 .
- a piston rod 5 travels into and out of the end of the dashpot opposite base 4 through a hole at the center sealed gas-tight by packing 10 .
- Mounted on the lower end of piston rod 5 and accordingly traveling back and forth inside inner cylinder 3 is a piston 6 , the spaces at each face constituting pressure chambers 7 and 8 .
- a compressible-gas accommodating compartment 11 compensates for variations in the volume of gas forced in by piston rod 5 as it travels in and out.
- Below vent 12 is a port 13 that opens into cylindrical gap 2 .
- Above packing 10 are other ports 14 , which open into gas-accommodating compartment 11 and allow the removal of excess lubricant from piston rod 5 .
- Vent 12 is fastened to base 4 at the bottom of outer cylinder 1 by interlocking beads and grooves.
- the edge of base 4 is welded to the edge of outer cylinder 1 .
- a depression 15 accommodates the head of a screw 16 employed to adjust vent 12 .
- FIG. 2 illustrates a variant of the embodiment illustrated in FIG. 1.
- the base 4 in this version is also welded to outer cylinder 1 , but merges into an inward-tapering section 17 with vent 12 mounted on its upper edge and provided with a collar 18 .
- the section of inner cylinder 3 extending above the transition between base 4 and inward-tapering section 17 is provided with ports 19 .
- the upper end of the two-cylinder dashpot, which provides access to the piston rod, in the embodiment illustrated in FIG. 3 is conventional, and only the lower end is accordingly illustrated.
- the bottom edge of outer cylinder 1 rests against the edge of inward-tapering section 17 of inner cylinder 3 , and both edges have been molded cold or hot around base 4 with no machining involved.
- Vent 12 which is fastened as in the embodiment illustrated in FIG. 2, can be introduced along with any other components through the upper, open, end of the dashpot.
- base 4 is provided with a depression 15 .
- the base 4 of the embodiment illustrated in FIG. 4 is similar to the base 4 specified with reference to FIG. 3, although inner cylinder 3 is in this case in a single part, and vent 12 must accordingly be inserted through it from above.
- the lower end 20 of inner cylinder 3 tapers in slightly, preventing damage to the cylinder's inner surface from the entering vent.
- Ports 19 are here as well provided at the transition to lower end 20 .
- a depression 21 demarcating the bottom edge of vent 12 is punched out along with ports 19 .
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
A dashpot with an inner cylinder (3) accommodated in an outer cylinder (1), and a piston (6) traveling back and forth inside on the end of a piston rod (5) and separating the inner cylinder into two chambers (7 & 8). The piston rod enters the cylinders through a hole at one end that seals it off and positions it. The outer cylinder is provided with a base (4) at the end opposite the end with the hole. The inner cylinder is centered along the axis of the outer cylinder at each end. The cylindrical gap (2) between the two cylinders is provided with a fluid-accommodating compartment (11) and, toward the base, a port (13) opening into the adjacent chamber (8). The chamber accommodates, preferably above the port, a vent (12). The mutually contacting ends of the cylinders are hot or cold welded together at the base end or at the end remote from the base.
Description
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- The present invention concerns a dashpot with two cylinders.
- Two-cylinder dashpots of this genus are preferred for eliminating the vibrations that occur between a vehicle and its wheels. Such absorbers generally comprise two loosely concentric cylinders, the gap between them occupied by a cushion of gas that compresses to accommodate the gas forced in by a piston rod that slides in and out to various extents.
- The base of the outer cylinder in a dashpot disclosed in
German OS 1 750 679 is molded on. That of the outer cylinder disclosed in WO 97/16656 on the other hand is separate and welded, cemented, or soldered on. - Both embodiments have the drawback that precisely centering the inner cylinder in relation to the outer cylinder requires considerable care.
- The object of the present invention is accordingly a simple and reliable means of attaching the outer cylinder to the inner cylinder of such a dashpot.
- This object is attained in accordance with the present invention in a dashpot of the aforesaid genus by the characteristics recited in the body of
claim 1. Advantageous additional and advanced embodiments are addressed byclaims 2 through 5. - The major advantage of the present invention is that the outer cylinder is reliably secured to the inner cylinder. Furthermore, however, the means of attachment are simple, which considerably decreases the cost of manufacture.
- One embodiment of the present invention will now be specified with respect to the accompanying drawing, wherein
- FIG. 1 is a section through a dashpot with two cylinders,
- FIG. 2 illustrates another version of the dashpot,
- FIG. 3 is a larger-scale illustration of the base of a dashpot, and
- FIG. 4 illustrates another version of the base illustrated in FIG. 3.
- A dashpot comprises an
inner cylinder 3 centered inside anouter cylinder 1 with acylindrical gap 2 left between them.Outer cylinder 1 is provided with abase 4. Apiston rod 5 travels into and out of the end of the dashpotopposite base 4 through a hole at the center sealed gas-tight by packing 10. Mounted on the lower end ofpiston rod 5 and accordingly traveling back and forth insideinner cylinder 3 is apiston 6, the spaces at each face constitutingpressure chambers accommodating compartment 11 compensates for variations in the volume of gas forced in bypiston rod 5 as it travels in and out. There is avent 12 at thebase 4 ofinner cylinder 3. Belowvent 12 is aport 13 that opens intocylindrical gap 2. Above packing 10 areother ports 14, which open into gas-accommodatingcompartment 11 and allow the removal of excess lubricant frompiston rod 5. - The open ends9 of the
outer cylinder 1 andinner cylinder 3 in the embodiment illustrated in FIG. 1 are welded together and folded in, leaving a round hole at the center to alignpiston rod 5 above packing 10.Vent 12 is fastened tobase 4 at the bottom ofouter cylinder 1 by interlocking beads and grooves. The edge ofbase 4 is welded to the edge ofouter cylinder 1. Adepression 15 accommodates the head of ascrew 16 employed to adjustvent 12. - FIG. 2 illustrates a variant of the embodiment illustrated in FIG. 1. The
base 4 in this version is also welded toouter cylinder 1, but merges into an inward-taperingsection 17 withvent 12 mounted on its upper edge and provided with acollar 18. The section ofinner cylinder 3 extending above the transition betweenbase 4 and inward-taperingsection 17 is provided withports 19. There is asimilar depression 15 inbase 4 to accommodate the head of a vent-adjustment screw 16. - The upper end of the two-cylinder dashpot, which provides access to the piston rod, in the embodiment illustrated in FIG. 3 is conventional, and only the lower end is accordingly illustrated. The bottom edge of
outer cylinder 1 rests against the edge of inward-taperingsection 17 ofinner cylinder 3, and both edges have been molded cold or hot aroundbase 4 with no machining involved.Vent 12, which is fastened as in the embodiment illustrated in FIG. 2, can be introduced along with any other components through the upper, open, end of the dashpot. Once the dashpot has been, conventionally, closed and the cushioning and pressure-accommodating gases injected, the dashpot is finished. Here again, as in the embodiments illustrated in FIGS. 1 and 2,base 4 is provided with adepression 15. - The
base 4 of the embodiment illustrated in FIG. 4 is similar to thebase 4 specified with reference to FIG. 3, althoughinner cylinder 3 is in this case in a single part, and vent 12 must accordingly be inserted through it from above. To facilitate assembly, thelower end 20 ofinner cylinder 3 tapers in slightly, preventing damage to the cylinder's inner surface from the entering vent.Ports 19 are here as well provided at the transition tolower end 20. Adepression 21 demarcating the bottom edge ofvent 12 is punched out along withports 19.
Claims (5)
1. Dashpot with an inner cylinder (3) accommodated in an outer cylinder (1), and a piston (6) traveling back and forth inside on the end of a piston rod (5) and separating the inner cylinder into two chambers (7 & 8), whereby the piston rod enters the cylinders through a hole at one end that seals it off and positions it, the outer cylinder is provided with a base (4) at the end opposite the end with the hole, the inner cylinder is centered along the axis of the outer cylinder at each end, and the cylindrical gap (2) between the two cylinders is provided with a fluid-accommodating compartment (11) and, toward the base, a port (13) opening into the adjacent chamber (8), which accommodates, preferably above the port, a vent (12), characterized in that the mutually contacting ends of the cylinders are hot or cold welded together at the base end or at the end remote from the base.
2. Dashpot as in , characterized in that the ends of the cylinders (1 & 3) are welded to a separate base (4).
claim 1
3. Dashpot as in , characterized in that the ends of the cylinders (1 & 3) are molded hot or cold into a base (4).
claim 1
4. Dashpot as in one or more of claims 1 through 3, characterized in that the base (4) is provided with a short upward-and-inward tapering section (17) of approximately the same diameter as the inner cylinder (3) that includes a vent (12) and that the inner cylinder continues beyond.
5. Dashpot as in one or more of claims 1 through 4, characterized in that the inner cylinder (3) has inward-extending depressions (21) above the ports (13 or 19) between the cylindrical gap (2) and the chamber (8) to accommodate the vent (12).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10000179.3-12 | 2000-01-05 | ||
DE10000179 | 2000-01-05 | ||
DE10000179A DE10000179A1 (en) | 2000-01-05 | 2000-01-05 | Two-tube shock absorbers |
Publications (2)
Publication Number | Publication Date |
---|---|
US20010006135A1 true US20010006135A1 (en) | 2001-07-05 |
US6450306B2 US6450306B2 (en) | 2002-09-17 |
Family
ID=7626775
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/751,003 Expired - Fee Related US6450306B2 (en) | 2000-01-05 | 2000-12-28 | Dashpot with two cylinders |
Country Status (4)
Country | Link |
---|---|
US (1) | US6450306B2 (en) |
EP (1) | EP1114946B1 (en) |
DE (2) | DE10000179A1 (en) |
ES (1) | ES2189723T3 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100263973A1 (en) * | 2009-04-16 | 2010-10-21 | Hall Everett A | Shock Absorber Having Unidirectional Fluid Flow |
US9222538B2 (en) | 2009-04-16 | 2015-12-29 | Oneiric Systems, Inc. | Shock absorber having unidirectional fluid flow |
US10107352B2 (en) | 2016-04-29 | 2018-10-23 | Beijingwest Industries Co., Ltd. | Hydraulic damper with a hydraulic stop arrangement |
CN109367562A (en) * | 2018-11-29 | 2019-02-22 | 中南大学 | A kind of combined orbit vehicle energy-absorbing anti-creeper |
US20190293143A1 (en) * | 2018-03-22 | 2019-09-26 | Zf Friedrichshafen Ag | Cylinder Unit having a Scaled Bottom |
US11391337B2 (en) * | 2018-11-29 | 2022-07-19 | Thyssenkrupp Bilstein Gmbh | Adjustable vibration damper and vehicle having such a vibration damper |
US11655874B2 (en) * | 2019-11-20 | 2023-05-23 | Thyssenkrupp Bilstein Gmbh | Vibration damper, and motor vehicle with a vibration damper of this type |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU3139199A (en) * | 1999-04-22 | 2000-11-10 | Nvb International | A device comprising a combination of a chamber and a piston |
WO2013068981A1 (en) | 2011-11-11 | 2013-05-16 | Schleuniger Holding Ag | Twisting head and twisting device |
DE102012220156A1 (en) * | 2012-11-06 | 2014-05-08 | Zf Friedrichshafen Ag | Piston-cylinder device reservoir pipe and working cylinder with piston rod distal ends that are closed by a common closure cap and are connected to one another through fluid connections |
DE102015224811A1 (en) * | 2015-12-10 | 2017-06-14 | Zf Friedrichshafen Ag | Vibration damper for a motor vehicle |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
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BE513336A (en) * | 1952-08-05 | |||
DE1750679A1 (en) | 1968-05-24 | 1971-04-29 | Reiche & Co | Pipe for shock absorbers and other hydraulic or pneumatic units |
US3674120A (en) * | 1971-02-01 | 1972-07-04 | Gen Motors Corp | Auxiliary shock absorber damping valves |
US3816701A (en) * | 1971-02-16 | 1974-06-11 | Gen Motors Corp | Method for manufacturing welded piston shock absorber |
US3889787A (en) * | 1973-10-05 | 1975-06-17 | Gen Motors Corp | Hydraulic shock absorber unit |
CA1058643A (en) * | 1976-03-22 | 1979-07-17 | Dale A. Palmer | Shock absorber |
DE2934671A1 (en) * | 1979-08-28 | 1981-03-19 | Fichtel & Sachs Ag, 8720 Schweinfurt | SHOCK ABSORBER FOR VEHICLES WITH A REPLACEABLE DAMPING UNIT |
JPS597856B2 (en) * | 1979-12-07 | 1984-02-21 | 本田技研工業株式会社 | Vehicle hydraulic shock absorber |
US4633983A (en) * | 1980-01-07 | 1987-01-06 | General Motors Corporation | Strut damper with base valve and cup retention |
JPS58142046A (en) * | 1982-02-18 | 1983-08-23 | Atsugi Motor Parts Co Ltd | Hydraulic buffer |
US4560042A (en) * | 1984-04-30 | 1985-12-24 | General Motors Corporation | Method of self-pressurizing a damper |
JPH0231615Y2 (en) * | 1985-12-26 | 1990-08-27 | ||
US5115892A (en) * | 1988-09-27 | 1992-05-26 | Atsugi Unisia Corporation | Hydraulic shock absorber with piston seal structure for enhancement of initial response |
US5070971A (en) * | 1990-04-23 | 1991-12-10 | General Motors Corporation | Molded piston for a hydraulic damper |
DE4213517A1 (en) * | 1992-04-24 | 1993-11-04 | Bilstein August Gmbh Co Kg | Hydraulic vibration damper for motor vehicles - has low level base valve set directly above base cap to reduce dead length. |
GB9323047D0 (en) * | 1993-11-09 | 1994-01-05 | Acg France | A method of forming a suspension strut |
US5577579A (en) * | 1995-10-30 | 1996-11-26 | General Motors Corporation | Method of manufacturing a suspension damper |
DE19706627B4 (en) * | 1996-03-01 | 2009-05-14 | Volkswagen Ag | Damper for a motor vehicle strut and method for producing a damper |
-
2000
- 2000-01-05 DE DE10000179A patent/DE10000179A1/en not_active Withdrawn
- 2000-12-05 ES ES00126661T patent/ES2189723T3/en not_active Expired - Lifetime
- 2000-12-05 EP EP00126661A patent/EP1114946B1/en not_active Expired - Lifetime
- 2000-12-05 DE DE50001488T patent/DE50001488D1/en not_active Expired - Lifetime
- 2000-12-28 US US09/751,003 patent/US6450306B2/en not_active Expired - Fee Related
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100263973A1 (en) * | 2009-04-16 | 2010-10-21 | Hall Everett A | Shock Absorber Having Unidirectional Fluid Flow |
WO2010121108A1 (en) * | 2009-04-16 | 2010-10-21 | Oneiric Systems, Inc. | Shock absorber having unidirectional fluid flow |
US8453809B2 (en) | 2009-04-16 | 2013-06-04 | Oneiric Systems, Inc. | Shock absorber having unidirectional fluid flow |
US8590679B2 (en) | 2009-04-16 | 2013-11-26 | Oneiric Systems, Inc. | Shock absorber having unidirectional fluid flow |
US9222538B2 (en) | 2009-04-16 | 2015-12-29 | Oneiric Systems, Inc. | Shock absorber having unidirectional fluid flow |
US10107352B2 (en) | 2016-04-29 | 2018-10-23 | Beijingwest Industries Co., Ltd. | Hydraulic damper with a hydraulic stop arrangement |
US20190293143A1 (en) * | 2018-03-22 | 2019-09-26 | Zf Friedrichshafen Ag | Cylinder Unit having a Scaled Bottom |
CN109367562A (en) * | 2018-11-29 | 2019-02-22 | 中南大学 | A kind of combined orbit vehicle energy-absorbing anti-creeper |
US11391337B2 (en) * | 2018-11-29 | 2022-07-19 | Thyssenkrupp Bilstein Gmbh | Adjustable vibration damper and vehicle having such a vibration damper |
US11655874B2 (en) * | 2019-11-20 | 2023-05-23 | Thyssenkrupp Bilstein Gmbh | Vibration damper, and motor vehicle with a vibration damper of this type |
Also Published As
Publication number | Publication date |
---|---|
EP1114946B1 (en) | 2003-03-19 |
ES2189723T3 (en) | 2003-07-16 |
US6450306B2 (en) | 2002-09-17 |
DE10000179A1 (en) | 2001-07-26 |
EP1114946A1 (en) | 2001-07-11 |
DE50001488D1 (en) | 2003-04-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: KRUPP BLISTEIN GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SASSE, THOMAS;REHSE, JORG;HARTIG, ULRICH;AND OTHERS;REEL/FRAME:011413/0013 Effective date: 20001211 |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20100917 |