DE2008122A1 - Pneumatically operated working cylinder - Google Patents

Description

Hanover, d. February 16, 1970 WP 6/70

Westinghouse Bremsen- und Apparatebau GmbH, Hanover

Pneumatically operated working cylinder

The invention relates to a pneumatically operated working cylinder, especially designed as a tandem cylinder prestressing cylinder with the pre-tensioning cylinder arranged coaxially to this acting brake valve for a force-tfalipseugbremsaiilage.

The invention has for its object to provide © _s ine and mechanical interaction of the BE in the oMgea'Gattung anspruchten Gerätekorabinatlon ₉ oils a compact structural unit with © kleinetmöglicher axial Erstreokimg

According to the invention, this object is achieved in that the Bottom of the working cylinder with a Luftöurefotrtttskanäle having, with a direct application of the Working cylinder controlling valve element of the brake valve cooperating exhaust valve seat is provided. .To this Way is formed at the same time as an inlet and outlet valve When the brake valve is actuated, the valve element moves against the outlet valve seat, so that the vent is closed and the inlet should be opened. In this way, the compressed air reaches the via the channels of the exhaust valve seat by the shortest possible route Working cylinder, so that led out to the side of the brake valve Ventilation lines can be dispensed with.

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With the help of this training it is possible to adjust the brake valve to be connected to the working cylinder in the shortest possible axial space.

The exhaust valve position is expediently in a tandem cylinder. ϊβ'Λ a pipe-like extension moving in the bandet * r; y lesser agitating ^ Mrsehen, -He. on the one hand ale piston guide tube of a piston ⁴ = and ^ -d ^ re-r ^ eltij v.lr; I-aftiuLr "- ^ lranal dee other piston? Ausfi": ΐ α :: ΐ ier- · ■ TV ^ c ⁵ Us': ■;.: ·. dujig a ^ 'c especially with siner. with de :: e.;. nr ^ -... j ge is =:.: ^ ;; K ^^ rualü /, au-3gestatteten. Tandeni cylinder e:; -'- '~ erh-V; ί c ^ e vi ^ Ki ^ ÄUije i: ^T > c ^ ere.lnfacfcung des "ylindore und daait der ■" ■ ij- ^ v-jj ^^ bi ^ atioh su.

Faohsequeni ^ e; ^: ^; ^:
in the Z-e- ■ '-i. . "■■

coupled? lteri - ". ''. ^ iUeCiU. ' It ^.; ■■ ■ ...; ■ "". "; - jder i ^v u: e actuation of a hydraulic Hauv- {· ■ ylL.J ■■■■■ ·;: - ö vin-? R Kraxtvi '^

The presented: ^1! .L- ArligitB ''? Linder 1 iat sealed on its base plate coaxially with the. Brake valve 3 flanged together. A hydraulic master cylinder 4, indicated by dashed lines, is arranged on the opposite land of Arbeitsozylnders 1. The brake valve 3 can be acted upon in a known manner by a pedal-operated plunger 5 which acts via a spring element 6 on a piston 7, the lower part of which is designed as an outlet valve seat 8 and in cooperation with a valve member

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the inlet and outlet of a brake circuit I controls. Another one Valve member 10 controls the inlet and outlet of a brake circuit II. The valve member 10 can be actuated by a piston 11 and with a fixed on the base plate 2 of the working cylinder 1 Exhaust valve seat 12 cooperates. The outlet valve seat 12 has a tubular extension 13 which extends into the working cylinder 1 protrudes and is provided with transverse bores 14 outside the working cylinder 1. The tubular extension 13 is on the one hand as a guide tube 15 of a first piston 16 and on the other hand, designed as an air duct 17 for a second piston, the tubular piston rod 19 together with the Guide tube 15 forms an annular channel 20. The piston rod 19 actuates a piston, not shown, of the hydraulic master cylinder 4 via a tappet 21, which occurs in that the piston 18 against a return spring 22 from the pressure of the brake circuit II and / or the piston 16 are acted upon by the pressure of the brake circuit I via a connecting channel. The actuating piston 11 of the brake valve 3 is either via a bore 24 from the pressure of brake circuit I or, in the event of failure of this circuit, can be actuated mechanically via a pressure disc 29 from a valve guide sleeve 25 which, in cooperation with a valve sleeve 26. Forms a vent channel 27, which via a check valve 28 is connected to the atmosphere.

Hereinafter, the operation of the arrangement will be explained: When operating the plunger 5 of the piston 7 is moved downward and closes by means of its exhaust valve seat 8 the vent Upon further downward movement of the inlet opening of the brake circuit I,

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so that the compressed air flowing in at the same time via the connecting channel 23 acts on the piston 16 of the working cylinder 1 and acts on the piston 11 of the brake valve 3 via the bore 24. Together with the piston 11, the valve member 10 is up to the stop on the 'Fixed outlet valve seat 12 on the base plate 2 of the working cylinder 1 moves, with the vent 27 closed and the inlet of the brake circuit II by lifting the valve member 10 is opened. In this way, the incoming compressed air passes directly through the transverse bores 14 of the outlet valve seat 12 into the Air duct 17 and by deflection via the annular channel 20 on the second piston 18 of the working cylinder 1, the pressure of the brake circuit II being lower than the pressure of the brake circuit I. In this way, both pistons 16, 18 for actuating the hydraulic master cylinder 4 against the force of the spring 22 are adjusted moved down.

If brake circuit I fails, piston 11 becomes the brake valve 3 mechanically moved downwards via the pressure disc 29 by means of the valve sleeve 25 to actuate the valve member 10, whereupon } only the piston charged with the pressure of brake circuit II 18 actuates the plunger 21 of the hydraulic cylinder 4.

If the brake circuit II fails, the sole application of the piston 16 by the pressure of the brake circuit I, both pistons 16, 18 are moved downwards together.

When the actuation tappet 5 of the brake valve 3 is relieved the spring-loaded pistons 7 and 11 return to their starting position * »

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moves, the likewise spring-loaded valve members 9 and the inlet of the two brake circuits Ϊ, II close and the outlet open, so that the compressed air passes through the ventilation space 27 and the check valve 28 can escape into the atmosphere «.

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Claims (2)

Patent or protection application eumatieoh actuated working cylinder, in particular as TandemsjlInder trained biasing cylinder * ftfmhrzeugbremeanlage with coaxially arranged thereto, the Yorspannzylinder acting Brenevect "for a Kr, characterized g <* Ji 6 ·.:. ■ κ S ₁ f ;: leans f d & ß {2} of the ground working dee (14) have dee workeesa brake valve (3) is «. 2. ta ::: üe ,;:. C-.Br S ^ adeaByliader (1) ^ .. ^ c iet, - ^ 2ie © is worth because £ (13) . (13) . TB3idemF-7l -: ^ :; sj according to Anepruoh 2, characterized in that the tubular support (13) as an air duct (17, 20) the other piston (18) is designed * 109838/0800