DE1921622A1 - Pressure compensation device for pneumatically operated spring brake cylinders on vehicles, especially motor vehicles - Google Patents

Description

Hanover, d. 18.4 * 1969 WP 28/68

Westinghouse Bremsen- und Apparatebau GmbH, Hanover

Pressure balancing device for pneumatically operated Spring brake cylinders on vehicles, especially motor vehicles ■ ".- · '" ..' *

The invention relates to a Druokausgleiohseinrichtung for pneumatically operated spring brake cylinders on vehicles, in particular motor vehicles, with a spring chamber consisting of a retraction chamber and a spring chamber divided from this by a piston and an operating part divided by an elastic membrane into a pressure chamber and a piston chamber. '

When actuating the spring-loaded parts of such arrangements there is a risk that dust and dust particles are sucked in as the piston retracts, which have an unfavorable effect on the sliding of the piston and cause the entire mechanism to function properly. It must, therefore, special precautions are taken to prevent that su _s dust and look sharp in the spring chamber of the spring part to penetrate. ·

It is known to use filters to meet these requirements To attach the suction nozzle of the spring chamber. However, this solution has the fold that the filters are easy to mess up and clogged so that they are constantly serviced and cleaned frequently Need to become. .

Another · well-known means is to use the atmosphere " side de whose mouth is particularly hollow. However, this arrangement is cumbersome and, moreover, does not offer sufficient protection.

Furthermore, it is known that the spring chamber with the druokbeaufaahlagt Rttokziehkammer the spring storage parts su connect, with the The fire chamber is vented via a non-return valve.

BATH ORIGINAL

009186/0767

However, such arrangements are very complex and prone to failure, because either a sonic release valve is assigned to each spring-loaded cylinder or a common one for all cylinders Schnelleseyentil is provided, which means an extensive pipeline provision has the consequence.

The invention has the task sugrunde to meet an arrangement su that reports all these disadvantages and a perfect one Ventilation of the fire chamber guaranteed.

This object is achieved according to the invention in that the spring chamber djes spring storage part via a flow channel with the Piston chamber of the operating part is in communication. This training has the advantage that a largely in the piston chamber Dust-free and moisture-free air volume under atmospheric pressure is available, which is independent of the compressed air · » system of the spring storage part and the operating part a flawless Ventilation of the spring chamber allows such that when actuating * the spring a stored air from the piston chamber is sucked into the expanding spring chamber. When the spring storage part is loosened, this air is simply surüokgedrüokt via the flow channel into the piston chamber, so that no special Inlet and outlet valves are required. «This simple and operationally reliable arrangement is an effective defense against this Penetration of dust particles and moisture in the spring chamber of the Federepeioherteile and create su without much effort.

The flow channel consists of two parts Fire chamber bsw. Piston chamber protruding aneole tubes, which over a hose line are connected to one another, wherein it is also advantageous if the Ansohlußstutsen protruding into the piston chamber is arranged at the highest point of the piston chamber. In this way it is avoided in any case that deposits, the sioh possibly in the course of the tent at the deepest point of the piston chamber could be torn into the spring chamber will*

BADORIEiNAL

009886/0767 ~

Further details of the invention are based on the following of an exemplary embodiment explained in more detail in the drawing.

Pie figure shows a combined spring brake cylinder Pederspeed head part clamped with duroh pressure medium and not acted upon he service brake. The combined spring brake cylinder There is also a piston spring rapeieherzyllnder 1 serving as an aid and plague parking brake and one as a service brake serving membrane cylinder 2, both of which are firmly connected to each other and are separated from one another by a partition 3.

In the piston spring storage cylinder 1, a piston 4 with a seal 5 is arranged displaceably against a storage spring 6, which is supported against a bottom of the Xoifeenfadarapeiehersylinders 1. The piston 4 divides the piston spring storage cylinder 1 into a spring chamber 8 and a retraction chamber 9. The pressure medium can reach the pull-back chamber 9 via an inlet 10. A pressure plate 11 iit duroh a rod 12 ', which penetrates sealed, the partition wall between the Kolbenfederepeioherr.ylisid@e 1 and the membrane cylinder 2 by a seal 13 _f secured to d "piston 4 connected ^ The membrane cylinder 2 by an elastically e membrane 14 »Which is clamped on its outer band between an upper part 15 and a bottom 16 of the diaphragm cylinder 2 is divided into a pressure chamber 17 and a piston chamber 18. The membrane 14 is supported against a piston plate 19 and a slide cover 20 guided centrally in the piston plate 19, the piston plate 19 in turn being supported via a spring 21 against the bottom 16 of the membrane cylinder 2 and the slide piece 20 with a pressure rod 22 with a fastening 23 is firmly connected for a brake lever, not shown. The pressure chamber 17 is connected via an inlet 24 to a brake valve not shown. At its rear end, the piston spring reservoir cylinder 1 is also provided with a protective cap 25, which prevents foreign bodies from binding into the feed chamber 8.

The? 6derkammer 8 of the piston spring storage cylinder 1 protrudes a flow channel 26 with the piston chamber 18 of the membrane cylinder ο 2 in connection. The flow channel 26 has two duroh

009886/0767 _

f 4 -

a hose line 27 connected to each other connection 0 tu te en 28, 29, which at the highest points in the spring chamber 8 and the piston chamber 18 x & gesi. The flow terminal is used for breathing, that is, ventilation of the fire chamber 3, whereas when the spring chamber 8 is expanded, a pressure equalization is established by sucking in clean air from the piston chamber 18 which is standing between atmospheric pressure.

It should also be mentioned that the StrSsungakanal 26, for example also as a pipeline or as an integral part of the spring-loaded brake cylinder housing can be formed.

In the shown position of the Eolben spring reservoir cylinder 1 according to the drawing, the retraction chamber 9 old compressed air is applied, so that the piston 4 is under 'Zussmmendr & ckung the teder 6 lays against an inwardly cranked projection 30, while the pressure chamber 17 of the diaphragm cylinder 2 is not acted upon is, so that the membrane 14 rests against the partition 3.

When the auxiliary and parking brakes are activated, the pull-out chamber is opened 9 of the piston spring storage cylinder 1 without pressure and the tensioned Speioherfede.r 6 pushes the Solbon 4 and thus the Rod 12 with expansion of the spring chamber 3 up to one Stop 31 of the projection 30, the pressure plate 11 over the membrane 14 and the slider 20 the Eolbentöller 19 and so that the pressure suction 22 moves against the force of the spring 21 and adjusted the brake linkage. As a result of this Process resulting expansion of the Federkaaamer 8 and the simultaneous Reduction of the piston chamber 18, air flows from the piston chamber 18 via the flow channel 26 into the spring chamber 8, to prevent the formation of a vacuum here. When solving the The backpack warmer 9 will use the auxiliary and parking brake again Compressed air is applied. The piston 4 moves eich under Susammendrüokung the Speioherfeder 6 big sum stop in the loading position return. In this way, the spring chamber 8 is vented again by the air in the expanding piston rotor 18 to ^ Uokstrumt, where no special vent valve is sn'oräerlioh, wr * but not fundamentally the separate AuorAmmg; such a one

Valve excludes.

BUILDING

ÖÖ98 867 07 6 7

Claims (3)

Patent baw. SehutgaiiBObruch J Direction compensation device for pneumatically operated spring storage cylinders on vehicles, in particular motor vehicles «with one of: a Rüokslehkasmer and from this spring-loaded part consisting of a spring hammer divided by a piston " as well as an operating part that is divided into a bruq chamber and a lever chamber, an elastic cable crane, dad u r ο h gekenawithout that the spring chamber (8) of the spring storage part (1) via a StrSmungekanal (26) is connected to the Eplbenkanmer (13) of the operating part (2). 2. BruckäusgLeiohereinriohtung according to claim 1, characterized in that that the Ströauagakanal (26) from svel in 4ie spring chamber (B) b8w. Piston Kasmer (16) protruding Ansohlufistutsan (28, 29), which are connected to one another via a hose line (27). 3. Druokauegleioheetnriohtung according to the claims. 1 and 2, thereby known that the one protrudes into the lolbenkaiaier (18) « Anoo> ilussstutzen (29) at the highest point near the Kolbeak chamber is arranged. 009886/0787 Blank page