PL81988B1 - - Google Patents
Download PDFInfo
- Publication number
- PL81988B1 PL81988B1 PL15562872A PL15562872A PL81988B1 PL 81988 B1 PL81988 B1 PL 81988B1 PL 15562872 A PL15562872 A PL 15562872A PL 15562872 A PL15562872 A PL 15562872A PL 81988 B1 PL81988 B1 PL 81988B1
- Authority
- PL
- Poland
- Prior art keywords
- valves
- cylinders
- valve
- piston
- hydraulic
- Prior art date
Links
- 238000012360 testing method Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40576—Assemblies of multiple valves
- F15B2211/40584—Assemblies of multiple valves the flow control means arranged in parallel with a check valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41527—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/47—Flow control in one direction only
- F15B2211/473—Flow control in one direction only without restriction in the reverse direction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/575—Pilot pressure control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
- F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/75—Control of speed of the output member
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
Uprawniony z patentu: Ministerium fur Verkehrswesen, Berlin (Niemiecka Republika Demokratyczna) Uklad sterujacy urzadzeniem do badan wsporników sprezynujacych dla sprzegów samoczynnych w pojazdach szynowych Przedmiotem wynalazku jest uklad sterujacy urzadzeniem do badan wsporników sprezynujacych dla sprzegów samoczynnych centralnych w pojaz¬ dach szynowych.Znane sa urzadzenia do badan wyzej wymie¬ nionych wsporników ze sterowaniem hydraulicz-" nym, w którym wymagane zmiany obciazen dzia¬ lajacych w osi pionowej regulowane sa pod wzgle¬ dem sily nacisku.Urzadzenia te posiadaja wady, polegajace na tym, ze nie daja one rzeczywistego obrazu zjawisk fizy¬ cznych zachodzacych w pracy wsporników w wa¬ runkach eksploatacyjnych, mozna nimi, mianowicie mierzyc jedynie wartosci obciazen zmiennych w osi pionowej, natomiast pomiar wartosci obcia¬ zen mimoosiowych zmiennych w odniesieniu do osi pionowej wspornika nie jest na tych urzadze¬ niach mozliwy.Celem wynalazku jest dostarczenie takiego ukla¬ du laczeniowego, który by umozliwial badanie wsporników sprzegów samoczynnych w warunkach symulujacych warunki eksploatacyjne a zarazem aby przy mozliwosci sterowania zmianami wiel¬ kosci obciazen, umozliwial takze sterowanie zmia¬ nami pozycji wspornika przed lub/i podczas pro¬ cesu badawczego.Zadanie wynalazku polega na dostarczeniu od¬ powiedniego ukladu laczeniowego dla opisywanego urzadzenia, które przez zastosowanie kombinacji 10 15 20 25 30 zaworów rozrzadczych umozliwiloby dowolone lub zaprogramowane sterowanie badaniami.Zgodnie z wynalazkiem zadanie to rozwiazano w taki sposób, ze cylindry robocze 31, 32, 33, 34, sa uruchamiane superpozycyjnie we wspóldzialaniu zespolowym lub tez moga dzialac niezaleznie od siebie, przy czym wymienione cylindry posiadaja sterowanie wstepne za pomoca medium hydrau¬ licznego podawanego przez pompe zebata i prze¬ plywajacego przez zawór redukcyjny oraz przez elektrycznie sterowane zawory rozrzadu wstepne¬ go, ponadto cylindry, zasilane sa medium roboczym podawanym przez pompe odsrodkowo-tlokowa po¬ przez zawory zwrotne oraz zawory przeplywowe, z tym, ze zawory te wylaczalne sa przez zawory rozrzadu wstepnego. Ta droga uzyskano mozliwosc sterowania hydraulicznego szeregu cylindrów ro¬ boczych, wykonujacych róznorakie funkcje, tak w pracy zsynchronizowanej jak i indywidualnej, zaleznie lub tez niezaleznie od siebie.Wynalazek wyjasniony jest przykladowo na ry¬ sunku, na którym przedstawiono schemat funkcjo¬ nalnego polaczenia poszczególnych organów ukladu.Instalacja sluzaca do obciazania badanych urza¬ dzen zaopatrywana jest w medium hydrauliczne pod cisnieniem ze zródla cisnien hydraulicznych.Silnik elektryczny 1 napedza pompe odsrodkowo- -tlokowa 3 oraz pompe trybikowa 4. Pompa ze¬ bata 4 zasysa plyn roboczy ze zbiornika 2. Stru¬ mien plynu roboczego zostaje natychmiast skiero-81988 3 wany z powrotem do zbiornika 2. Drugi strumien plynu przeplywa przez zawór redukcyjny 7, gdzie uzyskuje cisnienie robocze, po czym zostaje skiero¬ wany do zaworów wstepnego sterowania 14, 16, 18 i 20.Pompa odsrodkowo-tlokowa 3 zasysa plyn ze zbiornika 2. Po wlaczeniu strumienie zostaja po¬ zbawione cisnienia i poprzez zawory zwrotne 5 i 6, nastepnie — przez zawory przepylowe 15, 17, 19 i 21 i dalej filtr powrotny 35 powracaja do zbiornika 2. Przez elektryczne wlaczenie jednego z zaworów rozrzadu wstepnego 14, 16, 18 i 20, poszczególne zawory przeplywowe 15, 17, 19 i 21 sterowane sa hydraulicznie. W ten sposób droga przeplywu dla obu strumieni medium hydraulicznego do cylin¬ drów poboczych 31, 32, 33 i 34 zostaje otwarta.Wzrastajace teraz cisnienie zostaje ustalone w re¬ duktorach 8 i 9 a wielkosc tego cisnienia wskazuja manometry 12 i 13. Zawory sterowania wstepnego 14, 16, 18 i 20 moga byc wlaczane pojedynczo i pa¬ rami zawór 14 z zaworem 20 lub zawór 16 z za¬ worem 18. Przez wlaczenie zaworu sterowania wstepnego 20 zostaje wprowadzony w ruch (prze¬ suw boczny) cylinder roboczy 34. Zawór dlawikowy 22 zapobiega zbyt szybkiemu wysuwaniu sie i wsu¬ waniu trzona tlokowego w cylindrze roboczym 39.Przez wlaczenie zaworów sterowania wstepnego 16 i 18 zostaja uruchomione cylindry robocze 32 i 33 (przesuw pionowy). W tym momencie zawór ste¬ rowania wstepnego 14 nie moze byc uruchomiony.Przy nierównomiernym ustawieniu obu cylindrów roboczych 32 i 33 zawory 16 i 18 moga byc odpo¬ wiednio uruchamiane pojedynczo. Podwójne zawo¬ ry zwrotne 29 i 30 zapobiegaja w czasie prowadze¬ nia badan pomylkowej zamianie polozenia. Zalacze- < nie zaworu sterowania wstepnego 14 umozliwia uruchomienie cylindra roboczego 31 (przesuw po¬ dluzny).W czasie suwu tloka ku wnetrzu cylindra 31 plyn roboczy zostaje przeprowadzony od zaworu 15 25 30 '35 40 poprzez zawór dlawikowy 26 oraz przez zawór 27 do cylindra roboczego 31. Powrotny przeplyw ply¬ nu odbywa sie z cylindra roboczego 31 poprzez za¬ wór zwrotny 23 do zaworu przeplywowego 15. Za¬ wory zwrotne 28 i 25 zapobiegaja innej, niewlasci¬ wej drodze przeplywu. Ten zapobiegawczy srodek jest konieczny albowiem przez kazdorazowy suw tloka w jedna lub druga strone cylindra nastepuje napiecie dwóch sprezyn w aparacie tlumiacym wspornika, który podlega badaniom. Przy odwró¬ ceniu kierunku suwu tloka owe sprezyny wywie¬ raja dodatkowo nacisk na tlok, który juz i tak jest podcisnieniem hydraulicznym. Otóz ten dodat¬ kowy nacisk spowodowalby gwaltowne ruchy tloka o charakterze udarowym. Na skutek dzialania za¬ worów dlawikowych 24 i 26 strumien plynu jest odpowiednio dlawiony, dzieki czemu ruchy tloka staja sie równomierne. PL PLAuthorized by the patent: Ministerium fur Verkehrswesen, Berlin (German Democratic Republic) Control system for testing spring brackets for automatic couplings in rail vehicles. for the tests of the above-mentioned supports with hydraulic control, in which the required changes of loads acting on the vertical axis are regulated in terms of the pressure force. These devices have the disadvantages that they do not give a real picture of the phenomena In terms of operating conditions, they can be used to measure only the values of variable loads on the vertical axis, while the measurement of the values of eccentric loads with respect to the vertical axis of the support is not possible on these devices. the invention is to provide such a charm It would allow the testing of automatic couplings supports in conditions simulating the operating conditions and, at the same time, allowing the control of changes in the magnitude of loads, to also enable control of changes in the position of the support before and / or during the test process. According to the invention, this task is solved in such a way that the working cylinders 31, 32, 33, 34 are actuated by the use of a combination of dormers. superpositional in collective interaction or they can also operate independently of each other, the said cylinders being pre-controlled by a hydraulic medium supplied by the gear pump and flowing through the reduction valve and by electrically controlled primary timing valves, and the cylinders are also fed sa medium the working pump is fed by a centrifugal piston pump through check valves and flow valves, but these valves are disengaged by the primary valve. This way, it was possible to hydraulically control a series of working cylinders, performing various functions, both in synchronized and individual operation, depending or independently of each other. The invention is explained, for example, in the drawing, which shows a diagram of the functional connection of the individual organs. The installation used to load the tested devices is supplied with a hydraulic medium under pressure from a source of hydraulic pressure. Electric motor 1 drives a centrifugal-piston pump 3 and a gear pump 4. Gear pump 4 sucks working fluid from the tank 2. Structure The working fluid is immediately directed back to tank 2. The second fluid flows through pressure reducing valve 7 where it attains operating pressure, and is then directed to pilot valves 14, 16, 18 and 20. centrifugal piston 3 sucks in the liquid from the tank 2. through the check valves 5 and 6, then - through the overflow valves 15, 17, 19 and 21 and then the return filter 35 returns to the tank 2. By electric activation of one of the pre-valve valves 14, 16, 18 and 20, individual flow valves 15, 17, 19 and 21 are controlled hydraulically. The flow path for the two streams of hydraulic fluid to the auxiliary cylinders 31, 32, 33 and 34 is thus opened. The now rising pressure is established in reducers 8 and 9 and the pressure is shown by the pressure gauges 12 and 13. Pre-control valves 14, 16, 18 and 20 can be switched on individually and in pairs, valve 14 with valve 20 or valve 16 with valve 18. By switching on the pilot valve 20, the operating cylinder 34 is set in motion (side shift). The throttle 22 prevents the piston rod in the operating cylinder 39 from advancing and retracting too quickly. By activating the pilot valves 16 and 18, the operating cylinders 32 and 33 (vertical travel) are activated. At this point, the pilot control valve 14 cannot be actuated. If both working cylinders 32 and 33 are unevenly aligned, valves 16 and 18 can be actuated individually, respectively. The double check valves 29 and 30 prevent any misplacement during the tests. The inclusion of the pilot valve 14 enables the operating cylinder 31 to be activated (longitudinal travel). During the piston stroke towards the inside of the cylinder 31, the working fluid is conducted from valve 15 25 30 35 40 through throttle valve 26 and through valve 27 to the cylinder The fluid return flow is from the working cylinder 31 through the check valve 23 to the flow valve 15. The check valves 28 and 25 prevent any other, incorrect flow path. This preventive measure is necessary because each time the piston stroke on one side or the other side of the cylinder, two springs are tensioned in the damping device of the support to be tested. When the direction of the stroke is reversed, the piston springs additionally exert pressure on the piston, which is already a hydraulic depression. Well, this additional pressure would cause the plunger to move rapidly and with an impact type. Due to the action of the throttle valves 24 and 26, the fluid flow is appropriately choked so that the piston movement becomes even. PL PL
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD15542871A DD98593A3 (en) | 1971-05-28 | 1971-05-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| PL81988B1 true PL81988B1 (en) | 1975-10-31 |
Family
ID=5483889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PL15562872A PL81988B1 (en) | 1971-05-28 | 1972-05-26 |
Country Status (6)
| Country | Link |
|---|---|
| BG (1) | BG19204A3 (en) |
| CH (1) | CH539535A (en) |
| DD (1) | DD98593A3 (en) |
| DE (1) | DE2210583A1 (en) |
| FR (1) | FR2139826B1 (en) |
| PL (1) | PL81988B1 (en) |
-
1971
- 1971-05-28 DD DD15542871A patent/DD98593A3/xx unknown
-
1972
- 1972-03-04 DE DE19722210583 patent/DE2210583A1/en active Pending
- 1972-03-17 CH CH397372A patent/CH539535A/en not_active IP Right Cessation
- 1972-04-04 BG BG020138A patent/BG19204A3/en unknown
- 1972-04-12 FR FR7212819A patent/FR2139826B1/fr not_active Expired
- 1972-05-26 PL PL15562872A patent/PL81988B1/pl unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR2139826B1 (en) | 1973-07-13 |
| DD98593A3 (en) | 1973-07-12 |
| DE2210583A1 (en) | 1972-12-14 |
| CH539535A (en) | 1973-07-31 |
| FR2139826A1 (en) | 1973-01-12 |
| BG19204A3 (en) | 1975-04-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2577462A (en) | Pressure operated mechanism | |
| US7204084B2 (en) | Hydraulic system having a pressure compensator | |
| DE112008001503T5 (en) | Hydraulic system with an external pressure compensation device | |
| DE102005040322A1 (en) | Electronically and hydraulically actuated drain valve | |
| US1890010A (en) | Hydraulic apparatus for motor vehicles | |
| EP2572123A1 (en) | Vehicle having an automatic transmission and an automatic engine start/stop facility | |
| WO2005047658A1 (en) | Adjustment device for adjusting the relative rotational angle position of a camshaft in relation to a crankshaft of an internal combustion engine | |
| US2509623A (en) | Means for operating collapsible vehicle tops | |
| DE10059192C1 (en) | Hydraulic drive device for a vehicle | |
| EP0428581B1 (en) | Hydrostatic transmission system for vehicles | |
| DE112006002022T5 (en) | Electrohydraulic metering valve with integrated flow control | |
| DE2211404A1 (en) | UNLOCKABLE NON-RETURN VALVE | |
| DE2143181C3 (en) | Hydraulic telescopic vibration damper | |
| DE2301415A1 (en) | POWER STEERING FOR VEHICLES, IN PARTICULAR FOR MOTOR VEHICLES | |
| DE2502627B2 (en) | Device for the active damping of the vibrations of vertically vibrating masses, e.g. in vehicles | |
| DE439096C (en) | Control device for fluid transmission | |
| DE915419C (en) | Drosseleinstellvorichtung for the throttle fluid for damping control of vibration dampers, especially for motor vehicles | |
| DE647513C (en) | Device for compensating the thermal expansion of fluids on shock absorbers, especially for cars | |
| US3002354A (en) | Movement control apparatus | |
| DE4435148A1 (en) | Hydraulic control unit for power-assisted steering of motor vehicle | |
| DE1653525A1 (en) | Self-acting, pressure-dependent reversing device for double-acting hydraulic consumers | |
| DE533966C (en) | Combustion regulator for steam boiler systems that responds to the steam pressure | |
| DE440777C (en) | Brake accelerator for single-chamber compressed air brakes | |
| SU986811A1 (en) | Brake arrangement ,particularly, for motor vehicles | |
| DE102008027163A1 (en) | Valve lash adjuster |