• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    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.
    公开号:US20010006135A1
    申请号:US09/751,003
    申请日:2000-12-28
    公开日:2001-07-05
    发明作者:Thomas Sasse；Jorg Rehse；Ulrich Hartig；Oliver Poth
    申请人:Krupp Bilstein GmbH；
    IPC主号:F16F9-3235
    专利说明:
    [0001] [0001] 1. outer cylinder
    [0002] [0002] 2. cylindrical gap
    [0003] [0003] 3. inner cylinder
    [0004] [0004] 4. base
    [0005] [0005] 5. piston rod
    [0006] [0006] 6. piston
    [0007] [0007] 7. chamber
    [0008] [0008] 8. chamber
    [0009] [0009] 9. open end
    [0010] [0010] 10. packing
    [0011] [0011] 11. compartment
    [0012] [0012] 12. vent
    [0013] [0013] 13. port
    [0014] [0014] 14. ports
    [0015] [0015] 15. depression
    [0016] [0016] 16. screw
    [0017] [0017] 17. inward-tapering section
    [0018] [0018] 18. collar
    [0019] [0019] 19. port
    [0020] [0020] 20. lower end
    [0021] [0021] 21. depression
    [0022] The present invention concerns a dashpot with two cylinders. [0022]
    [0023] 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. [0023]
    [0024] 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. [0024]
    [0025] Both embodiments have the drawback that precisely centering the inner cylinder in relation to the outer cylinder requires considerable care. [0025]
    [0026] 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. [0026]
    [0027] 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 [0027] 1. Advantageous additional and advanced embodiments are addressed by claims 2 through 5.
    [0028] 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. [0028]
    [0029] One embodiment of the present invention will now be specified with respect to the accompanying drawing, wherein [0029]
    [0030] FIG. 1 is a section through a dashpot with two cylinders, [0030]
    [0031] FIG. 2 illustrates another version of the dashpot, [0031]
    [0032] FIG. 3 is a larger-scale illustration of the base of a dashpot, and [0032]
    [0033] FIG. 4 illustrates another version of the base illustrated in FIG. 3. [0033]
    [0034] A dashpot comprises an inner cylinder [0034] 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. There is a vent 12 at the base 4 of inner cylinder 3. 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.
    [0035] The open ends [0035] 9 of the outer cylinder 1 and inner cylinder 3 in the embodiment illustrated in FIG. 1 are welded together and folded in, leaving a round hole at the center to align piston rod 5 above packing 10. 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.
    [0036] FIG. 2 illustrates a variant of the embodiment illustrated in FIG. 1. The base [0036] 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. There is a similar depression 15 in base 4 to accommodate the head of a vent-adjustment screw 16.
    [0037] 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 [0037] 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. 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 a depression 15.
    [0038] The base [0038] 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. To facilitate assembly, 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.
    权利要求:
    Claims (5)
    [1" id="US-20010006135-A1-CLM-00001] 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" id="US-20010006135-A1-CLM-00002] 2. Dashpot as in
    claim 1 , characterized in that the ends of the cylinders (1 & 3) are welded to a separate base (4).
    [3" id="US-20010006135-A1-CLM-00003] 3. Dashpot as in
    claim 1 , characterized in that the ends of the cylinders (1 & 3) are molded hot or cold into a base (4).
    [4" id="US-20010006135-A1-CLM-00004] 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" id="US-20010006135-A1-CLM-00005] 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).
    类似技术:
    公开号 | 公开日 | 专利标题
    US5579876A|1996-12-03|Stopper for a hydraulic dashpot
    US7100750B2|2006-09-05|Assembly for a Hydraulic Dashpot
    US6450306B2|2002-09-17|Dashpot with two cylinders
    US4960188A|1990-10-02|Single-tube vibration damper of variable damping force
    US6644354B2|2003-11-11|Hydraulic fluid accumulator
    US7441639B2|2008-10-28|Dashpot with amplitude-dependent shock absorption
    US4364457A|1982-12-21|Piston-cylinder unit particularly for shock absorber or compression strut
    US5413319A|1995-05-09|Fluid damped bushing
    US5386973A|1995-02-07|Elastomeric bearing
    US5580034A|1996-12-03|Shock absorbing oil cylinder for a bicycle
    WO2003016723A3|2004-08-26|Piston-type accumulator
    JP2007057088A|2007-03-08|Cylinder device
    US6397987B1|2002-06-04|Dashpot piston in halves
    US4728084A|1988-03-01|Adjustable-length gas spring
    JP2008138696A|2008-06-19|Divided piston structure for hydraulic shock absorber
    US20020121731A1|2002-09-05|Pneumatic connections for vehicle suspensions
    JP2001311446A|2001-11-09|Hydraulic shock absorber
    KR860003086A|1986-05-19|Shock absorbers, such as pneumatic impact tools
    US20030038414A1|2003-02-27|Hydraulic vibration-damping support
    KR100412913B1|2003-12-31|Seal Structure for Rodless Cylinder
    US5388676A|1995-02-14|Hydraulic dashpot for motor vehicles
    US5431014A|1995-07-11|Master cylinder
    JP4480232B2|2010-06-16|accumulator
    CN104364551B|2017-05-10|Rolling piston for an air spring rolling bellows
    JPH1137202A|1999-02-12|Piston seal in hydraulic shock absorber
    同族专利:
    公开号 | 公开日
    DE50001488D1|2003-04-24|
    EP1114946A1|2001-07-11|
    US6450306B2|2002-09-17|
    DE10000179A1|2001-07-26|
    EP1114946B1|2003-03-19|
    ES2189723T3|2003-07-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2010121108A1|2009-04-16|2010-10-21|Oneiric Systems, Inc.|Shock absorber having unidirectional fluid flow|
    US9222538B2|2009-04-16|2015-12-29|Oneiric Systems, Inc.|Shock absorber having unidirectional fluid flow|
    US10107352B2|2016-04-29|2018-10-23|Beijingwest Industries Co., Ltd.|Hydraulic damper with a hydraulic stop arrangement|
    US20190293143A1|2018-03-22|2019-09-26|Zf Friedrichshafen Ag|Cylinder Unit having a Scaled Bottom|BE513336A|1952-08-05||||
    DE1750679A1|1968-05-24|1971-04-29|Reiche & Co|Pipe for shock absorbers and other hydraulic or pneumatic units|
    US3674120A|1971-02-01|1972-07-04|Gen Motors Corp|Auxiliary shock absorber damping valves|
    US3816701A|1971-02-16|1974-06-11|Gen Motors Corp|Method for manufacturing welded piston shock absorber|
    US3889787A|1973-10-05|1975-06-17|Gen Motors Corp|Hydraulic shock absorber unit|
    CA1058643A|1976-03-22|1979-07-17|Dale A. Palmer|Shock absorber|
    DE2934671C2|1979-08-28|1988-10-27|Fichtel & Sachs Ag, 8720 Schweinfurt, De||
    JPS597856B2|1979-12-07|1984-02-21|Honda Motor Co Ltd||
    US4633983A|1980-01-07|1987-01-06|General Motors Corporation|Strut damper with base valve and cup retention|
    JPS58142046A|1982-02-18|1983-08-23|Atsugi Motor Parts Co Ltd|Hydraulic buffer|
    US4560042A|1984-04-30|1985-12-24|General Motors Corporation|Method of self-pressurizing a damper|
    JPH0231615Y2|1985-12-26|1990-08-27|||
    US5115892A|1988-09-27|1992-05-26|Atsugi Unisia Corporation|Hydraulic shock absorber with piston seal structure for enhancement of initial response|
    US5070971A|1990-04-23|1991-12-10|General Motors Corporation|Molded piston for a hydraulic damper|
    DE4213517A1|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|1993-11-09|1994-01-05|Acg France|A method of forming a suspension strut|
    US5577579A|1995-10-30|1996-11-26|General Motors Corporation|Method of manufacturing a suspension damper|
    DE19706627B4|1996-03-01|2009-05-14|Volkswagen Ag|Damper for a motor vehicle strut and method for producing a damper|AT381674T|1999-04-22|2008-01-15|Nvb Composites Internat A S|DEVICE CONSISTING OF THE COMBINATION OF A CHAMBER WITH A PISTON|
    WO2013068981A1|2011-11-11|2013-05-16|Schleuniger Holding Ag|Twisting head and twisting device|
    DE102012220156A1|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|2015-12-10|2017-06-14|Zf Friedrichshafen Ag|Vibration damper for a motor vehicle|
    DE102019131319A1|2019-11-20|2021-05-20|Thyssenkrupp Ag|Vibration damper and motor vehicle with such a vibration damper|
    法律状态:
    2000-12-28| 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 |
    2006-03-13| FPAY| Fee payment|Year of fee payment: 4 |
    2010-04-26| REMI| Maintenance fee reminder mailed|
    2010-09-17| LAPS| Lapse for failure to pay maintenance fees|
    2010-10-18| STCH| Information on status: patent discontinuation|Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
    2010-11-09| FP| Expired due to failure to pay maintenance fee|Effective date: 20100917 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE10000179A|DE10000179A1|2000-01-05|2000-01-05|Two-tube shock absorbers|
    DE10000179||2000-01-05||
    DE10000179.3-12||2000-01-05||
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