DE2163840A1 - PRESSURE ACTUATED CYLINDER - Google Patents

Description

Munich, 10 * 12.1971 *> ie ^ ö / n

TPi-pd / kl ZlbJö4U

-1029 "

KM) EB-BREMSE 'GmbH., 8 Munich Ij> Moosächer Str * 80

"Pressurized cylinder" *

The invention relates to a fluid-actuated cylinder of a cylindrical central part for receiving the piston _s a to which the engaging on the piston rod one end of the central portion connectable cylinder head portion and a connectable to the change end deö central part cylinder bottom part with a central recess for the pressure-tight guide *

There are known cylinders of the type mentioned in the the head and bottom parts arranged over between them Tie rods are held at the ends of the middle section " Such connections are complex to assemble and require relatively large flange diameters aii the head and bottom parts to accommodate the ends of the tie rods.

In addition, various other connections are Bum Assembling a cylinder known ^ in those in .essential ■ enen the same disadvantages exist.

The object of the invention is a particularly simple and bil-

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lig. to indicate manufacturable cylinder of the type mentioned above, which is easy to assemble and dismantle and ' which hardly demands a largely small one.

The object is achieved according to the invention in such a manner that the releasable connection is formed between the central part and at least one subsequent head and bottom part as an elastic snap connection, wherein in the compound s st el lung, a sealing ring between the connecting TEI ^ 1en.druckdicht is clamped.

At least one of those that can be connected to one another is advantageous Parts made of plastic »~ ■

In a preferred embodiment, the middle part and the connected head and bottom parts are made of plastic.

P A cylinder according to the invention can be designed in such a way that that the connection between two parts consists of one bead-shaped projection on one part and an associated one There is a groove in the other part, and at least one part is one which allows the bead to snap into the groove Has elasticity, with inclined surface sections coming into contact with one another on the projection and the groove are present along which the parts are compulsorily in a

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fixed connection position are provided in which a seal is clamped pressure-tight between a shoulder on one part and an end face on the other part.

In connection with the aforementioned problem, a cylinder in which the cylinder base part has a central recess at its end facing away from the central part for receiving a ring seal in contact with the base part and the piston rod can be advantageously designed ¹ , 'that at the front end of the . Recess radially inwardly directed projections are present, behind which a. Lid-like ring body made of plastic to limit the axial play of the ring seal snaps into the recess.

It is clear that such an unbuttoned onto a piston rod Piston is not limited to specific cylinders. However, it fulfills the condition of a largely simple one and cheap manufacture of a cylinder. The piston-cylinder unit according to the invention represents a complete component, which can be exchanged as a whole for a corresponding new component in the event of wear or damage. One such "one-way" piston rod in conjunction with a Piston attached is much easier and cheaper to manufacture than the known piston rods with which they bearing piston, so that even with wear only the piston

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bens the piston with the associated piston rod against one new complete component can be replaced.

The invention is described and explained in greater detail using an exemplary embodiment. In the associated Drawings shows: "- '■

Fig. 1 is a section through a cylinder according to the invention,

Fig. 2 shows the piston in Fig.:1 in an enlarged Dar-. position and

3 shows the front end of a piston rod for attachment of a piston according to FIGS. 1 and 2.

According to FIG. 1, a cylinder 1 according to the invention consists of a cylindrical middle part 2, a cylinder head part 3 "and a cylinder base part 4. ^{The head and base parts each have a pressure medium connection 5 and 5 1 SiUf} The cylinder base part contains a central opening for the passage of a piston rod 6, which holds a piston 7 at one end, which is connected in the middle part.

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is slidably arranged. ·

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The head and base parts 5, 4 of the cylinder as well as the middle part 2 are made of plastic. and bottom parts are made essentially the same, only with the difference that the cylinder head part is a has inner wall 8, which can be acted upon by the pressure medium Cylinder space from the outer connection side of the cylinder head part separates.

The head or bottom part each has a protruding part 9 with a bead-shaped projection 10, which is in the Connection division on the middle part 2 in a groove 11 in the Middle part 2 snaps into place.

For this purpose, the middle part 2 advantageously consists of one Plastic and has such a strength that it is used to connect the top or bottom part during the snap-in process the middle part elastically widens slightly and then springs back into its original shape. At the bead-shaped attachment 10 and on the groove 11 there are inclined surface sections 12j 13, which come to rest against each other in the fixed connection. Along these 3? 1 area sections 12 »13 get the two parts to be connected of the cylinder is forced into a fixed connection pitch in which a sealing ring 14 between a shoulder 16 on the head or base part and the end face 15 of the middle part 2 is clamped in a sealing manner. The face I5 on the middle part 2 and the end faces on the head and bottom parts

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Slightly beveled to make it easier to push together two parts to be connected.

As I said, the bottom part is 4- accordingly like that. Head part 3 formed. Likewise, the bottom part 4-facing end of the middle part is designed in accordance with its opposite other end, so that a loading. Writing of the connection between the middle part 2 and the bottom part 4- is not required. - '■ -

The bottom part has on its facing away from the middle part End of a cylindrical recess 17 for receiving a double lip seal 18, which is through a lid-like king body 19 limited axially displaceable in the recess 1? is held. The lid-like king body is made of plastic snapped behind radial projections 20.

The piston rod 6 is advantageously combined with the piston 7 to form a complete structural unit, which as a whole can be exchanged and exchanged for a corresponding structural unit. For this purpose, the piston 7 in Fig. firmly vulcanized onto a King disk 21. The King disc with the piston is pushed onto a metallic extension 22 at the front end of the piston rod 6. The approach contains a central recess 23 to form an outer one Edge 24, which is used to attach the washer

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with the vulcanized piston into the position shown by dashed lines (flanged). Such a one Attaching a piston to a piston rod is extremely simple, time-saving and can be done with simple tools perform without difficulty.

A radial ring section advantageously extends 25 of the piston 7 over the entire end face of the annular disk 21 while the opposite other end face of the washer is only partially covered by the piston, so that the edge 24 can be folded over directly onto the ring disk 21 and the piston with the radial ring section 25 between the annular disk 21 and a shoulder 26 on the front The end of the piston rod is clamped.

Claims

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Claims (6)

Claims MJ pressure medium operated cylinder of a cylindrical central part for receiving the piston, one of the eingreifen- one end of the central portion connectable cylinder head portion and an other one with the end of the central portion connectable cylinder bottom part with a central recess for the 'fluid-tight guidance of the piston length: the piston rod , characterized in that the releasable connection between the middle part (2) and at least one adjoining head or bottom part (J; 4) is designed as an elastic snap connection, in which a sealing ring (14-) between the parts to be connected is pressure-tight in the connection position is clamped. 2. Cylinder according to claim 1, characterized in that at least one of the parts that can be connected to one another is made of plastic. 3 cylinder according to claim 1 or 2, characterized in that that the connection between two parts consists of one bead-shaped projection (10) on one part and an associated groove (11) in the other part and at least a portion has elasticity to allow the bead to snap into the groove, wherein on the projection and the groove mutually BAD ORiGiNAL -309626/0593 '-. 9 -. end inclined surface sections (12 * I3) are available, along which the parts are forcibly in a fixed connection position are held ^ in which the sealing ring (14) between a shoulder (16) an.dem a part and a Front face (15) clamped pressure-tight on the other part is. 4. Cylinder according to claims 1 to 4-, characterized in that that the head and bottom parts (3 »4) are essentially are designed the same *. 5. Cylinder according to one of claims 1 to 3 »wherein · the cylinder base part at its end facing away from the central part a central recess for receiving an annular seal in contact with the bottom part and the piston rod, ', characterized in that at the front end äer recess (1?) radially inwardly directed projections (20) are present, behind which a lid-like ring body (19) made of plastic to limit the axial play of the ring seal (18) in the Recess snaps. 6. cylinder in particular according to claim 1, characterized '■ shows that the piston (?) "on an annular disc (21) is firmly applied ', which see a protruding metallic approach (22) at one end of the piston rod (6) ■ · ■., BAD ORIGINAL 309828/0593 _ ₁₀ _ 2TS3840 overlaps, with the approach being a central exception (23) has to form an outer edge (24-), which is flanged to fasten the ring disc with the piston on the piston rod. BATH ORIGINAL 09 826/0593