DE2814874A1 - SPRING STORAGE CYLINDERS, IN PARTICULAR SPRING STORAGE BRAKE CYLINDERS FOR ROAD VEHICLES - Google Patents

Description

28U874

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State of the art

The invention is based on a spring-loaded cylinder the genre of the main claim. Such a spring-loaded cylinder is known (DT-AS 1 238 792).

In such spring-loaded cylinders there is the problem of venting the breathing chamber, the volume of which occurs each time the brake is actuated and loosening experiences a change. If you do not want to reduce the effectiveness of the memory spring, the Breathing chamber have a reliable connection to the outside air.

However, ventilation of the breathing chamber is particularly problematic when the spring brake cylinder is used as a spring brake cylinder is used for a vehicle. Because in the installation interior / c / 7 under the vehicles there is snow when it rains and / or dusty road such dirt that many corrosive substances from breathing in the breathing chamber and other particles enter the breathing chamber. They settle on the storage spring and in the spring storage cylinder and exert a damaging influence on the work of the spring accumulator. It is particularly disadvantageous when in the spring-loaded cylinder a piston and a running surface for this are available, because then there is corrosion or contamination particularly detrimental to the mobility of the spring accumulator affects. The problem could be solved by using a diaphragm piston. Such a diaphragm piston but in the spring-loaded cylinder has the disadvantage that it is performed because of the non-axially parallel force output of the storage spring must become. In addition, a diaphragm piston is a special feature because of the changing effective area of the diaphragm during the stroke in the event of auxiliary braking in conjunction with the trailer

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Braking the desired linear characteristic of the pressure curve difficult to reach.

To avoid the disadvantage of dirt, oil or water acidification It has also already been proposed to use the breathing chamber in combined single-chamber spring-release brake valves of the spring-loaded cylinder with the spring chamber of the brake cylinder via a pipe (OE-PS 300 599). However, such a design is cumbersome.

Advantages of the invention

The spring-loaded cylinder according to the invention with the characteristic Features of the main claim has the advantage that an outside air connection to the short distance Breathing chamber of the spring-loaded cylinder is made and that this connection is easy to penetrate prevents harmful substances from entering the breathing chamber.

Advantageous further developments of the subject matter of the main claim result from the features of the subclaims.

drawing

An embodiment of the invention is shown in the drawing and explained in more detail in the following description. 1 shows a combined single-chamber spring brake cylinder in section and FIG. 2 shows a section through a support flange of the cylinder.

Description of the invention

A spring-loaded cylinder has a cup-shaped housing 1

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made of sheet metal which is closed by a cast cover 2. The housing 1 has a working cylinder 3, which is on its end facing a bottom 4 carries a shoulder 5 to which a spring receiving cylinder 6 of smaller length is attached connects.

In the center of the base 4 is a nut 7 for an emergency release screw 8 attached. In this way, a screw point is formed here. The screw 8 protrudes with its free end 9 in the Spring-loaded cylinder into it and there carries a washer 10, which is attached to the emergency release screw with a smaller screw 11 8 is attached. The screw end 9 together with the washer 10 and screw 11 are held by a tubular piston rod 12 added round cross-section and are longitudinally movable in this.

The tubular piston rod 12 is facing away from the base 4 End closed by a radial wall 13 and extends through, sealed by means of an annular seal 14, the Lid 2 centric. The other end of the tubular piston rod 12 rests on a spring-loaded piston made of sheet metal 17 at. The piston 17 is sealed with a seal 19 with respect to the working cylinder 3, the seal 19 from a soft ring collar 20 and a harder one Guide ring 21 consists. The piston 17 represents a movable wall of a spring-loaded pressure chamber 16.

A spring plate 22 rests on the piston 17, the shape of which is adapted to that of the spring-loaded piston 17. On the spring plate 22 a storage spring 23 is placed between the spring plate 22 and the bottom 4 is clamped.

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A breathing chamber 24 accommodating the storage spring 23 is on an overhead point on its side wall a hole 25 with an outwardly curved annular edge 26, and in this edge 26 is a 90 -Bogenstück 27 made of plastic with a button flange 28 attached and thus fixed in position. In the free end of the bend 27, a straight pipe 28 is inserted, the other end of which is also made of plastic in a second existing 90-bow piece 29 is inserted. In the area of said pipe section end, the bend 29 is in a axially parallel through hole 30 of a support flange 2 '. The curved piece 29 is provided at its other end with a flange 31 (FIG. 2) and then has an axial shoulder 32, with which it is inserted into a supporting flange bore 33 and is fixed in position by the flange 31.

The support flange bore 33 is arranged parallel and perpendicular to the axis 34 of the spring-loaded cylinder. The bore 33 is although it is designed as a through-hole, it has a shoulder 35 that supports a cylindrical filter 36 serves. The filter 36 is inserted into the bore 33 and between the shoulder 35 and one end 37 of the axial extension 32 held and fixed in position. An outside air connection of the bore bears the reference number 33 '.

A single-chamber brake cylinder 40 is assembled with the housing 1 of the spring-loaded cylinder to form a single-chamber spring-loaded brake cylinder unit. The brake cylinder 40 has a piston rod 41, the rod coaxially to the tubular piston · 12 is arranged and is in the position shown with it in operative connection. With a free end 42, the piston rod 41 protrudes in a sealed manner from the single-chamber brake cylinder 40 and is provided there with an articulation point for a brake linkage in a manner not shown. In the unicameral

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Brake cylinder 40 used screws 43 are used to attach the single-chamber spring-loaded brake cylinder to a not shown Vehicle part. In the brake cylinder 40 is a diaphragm piston 44 against the force of a return spring 45 by the Pressure in a pressure chamber 46 is movable.

Effect swe i s e

During normal braking with the service brake, the spring-loaded pressure chamber 16 is under supply pressure. The memory spring 23 is curious. In the single-chamber brake cylinder 40 takes place Pressure rise in the pressure chamber 46, whereupon the piston 44 moves the piston rod 41 to the right. Possibly in the spring chamber the single-chamber brake cylinder 40 penetrating splash water, Dirt or dust do not play such a big role here because the piston of the single-chamber brake cylinder is designed as a diaphragm piston is.

With spring-loaded brakes, the supply pressure is taken from the pressure chamber 16 drained, whereupon the storage spring 23 via its spring plate 22 the tubular piston rod 12 and with this the two pistons 17 and 44 together with the piston rod 41 moved to the right. The same movement occurs in the event of a failure the supply air supply.

If the brakes are to be released from the spring-loaded braking position, e.g. to drive the vehicle to a workshop, so one speaks of an "emergency solution". For this purpose, the emergency release screw 8 is rotated in its nut 7 so that it unscrews itself from the spring-loaded brake cylinder 26. The washer 10 fastened to the screw 8 rests against the spring tool 22, whereupon the latter tensions the storage spring 23, so that the brake linkage is relieved.

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Breathing in the breathing chamber 24 takes place via the pipeline 28, the filter 36. Dirt, water and oil can come from outside do not penetrate into the breathing chamber 24. You are held by the filter 36, so that nothing in the respiratory box 24 pollute and nothing can corrode.

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Claims (8)

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3/13/1978 He / Ht ROBERT BOSCH GMBH, 7000 STUTTGART 1 Expectations Spring-loaded cylinders, in particular spring-loaded brake cylinders for road vehicles, with a support flange for attaching the cylinder to a support part and with a Storage spring inserted into a breathing chamber provided between a cylinder base and a spring storage piston which is connected to an outside air connection via a special line, characterized in that the line (27, 28, 29) is guided to the support flange (2 ') and there opens into a support flange bore (33) into which a cylindrical Filter (36) is inserted and which has the outside air connection (33 ') at its other end. 2. Spring-loaded cylinder according to claim 1, characterized in that that the support flange bore (33) is arranged parallel and perpendicular to the axis (34) of the spring-loaded cylinder (1). 3. Spring-loaded cylinder according to claim 1 or 2, characterized in that that the support flange bore (33) has a shoulder (35) on which the filter (36) is placed. -2- R. * ^{5 aa} 4. Spring-loaded cylinder according to claim 3, characterized in that the filter (36) between the shoulder (35) and one end (37) of the pipeline (27, 28, 29) is clamped and fixed in position. 5. Spring-loaded cylinder according to one of claims 1 to 4, characterized characterized in that the pipeline (27, 28, 29) consists of a straight pipe section (28) and two curved end pieces (27, 29). 6. Spring-loaded cylinder according to claim 5, characterized in that that the curved end pieces (27, 29Jz ^ gIeIcIi have an arc of 90 °, are made of plastic and have a flange (28, 31) for determining the position on the spring-loaded cylinder (1) or on the support flange (2 ¹ ). 7. Spring-loaded cylinder according to claim 6, characterized in that one curved piece (27) has a Einkflipf ~ ^F flange (28) and the other curved piece (29) has a contact flange (31) with an axial shoulder (32), the end faces (37) of which contact for the filter is. 8. Spring-loaded cylinder according to claim 6 or 7, characterized in that the curved ^{piece (29) fastened to the support flange (2 1} ) is additionally supported at its end receiving the pipe section (28) in an axially parallel support flange bore (30). 909842/0149