DE3323407A1 - Cylinder for hydraulic systems, in particular for motor vehicles - Google Patents

Abstract

A cylinder for hydraulic systems is to be created in which light and inexpensive components are used and which in addition has a cylinder bore which requires no re-work whatsoever. To solve this problem, a tubular part is used as a cylinder bore, to the ends of which the mounting parts having the connections are directly attached by aluminium or zinc die-casting in a fixed and pressure-tight manner during the die casting.

Description

Cylinder for hydraulic cal systems, especially for motor vehicles

The invention relates to a cylinder for hydraulic systems, in particular for motor vehicles, consisting of a Housing with an axial bore in which a piston is axially displaceable and on one side with hydraulic Fluid is acted upon, the cylinder having connections for at least one pressure line, a connection is provided for a liquid chamber and for attachment.

There are known cylinders for hydraulic systems (e.g. DE-OS 3o 21 893), in which the housing is made of chill-cast designs are made. Such a design principle includes those that are unfavorable in today's automobile construction Factors such as high processing effort with expensive costs and high weight. It's a flawless one Inner cylinder machining necessary so that the cylinder running surface a perfect seal against the piston is guaranteed. Regardless of the strength and sealing problems With such a material, due to the high weight of the material and the enormous amount of machining required only achieve an inexpensive unit price per unit.

In addition, cylinders are known (e.g. DE-OS 29 23 315), in which the housing is made of an aluminum alloy is, however, the cylinder bore due to the high stress with an iron layer by electrical

PRP 433

plating is provided. However, this reduces the advantages of the light material due to the difficult Making up again.

Proceeding from this, it is the object of the invention to provide a cylinder with a low weight and an inexpensive one To create manufacture, the housing of which has a cylindrical running surface which can be manufactured without machining without reworking, the surface meeting the requirements and has a correspondingly long service life.

To solve this problem, the invention provides that the part of the housing containing the bore consists of a tubular part and the at least one having the connections Attachment consists of die-cast, wherein the pipe part and the attachment (s) are firmly and pressure-tightly connected to one another.

It is advantageous in this embodiment that by favorable material combinations both a high processing effort as well as a high dead weight avoided can be. Due to a composite construction with a pipe part and a die-cast add-on part, machining of the inside of the cylinder can be dispensed with, with strength problems can be positively influenced by a suitable choice of material. Noise problems on the cylinder surface during the Operations are replaced.

It is also advantageous that the integration of the pipe parts into the die-cast add-on parts is almost any desired Attachment of mounting flanges or the like as well as the connection connections for ventilation elements and connecting lines.

According to a further essential feature it is provided that the add-on parts with the pipe part are connected to one another in a non-detachable and form-fitting manner. This fastening

433

art eliminates the need for special devices to connect the parts. A particularly advantageous embodiment provides that the form fit between the components during the; Die casting of the attachments is made. Here, the pipe part is introduced directly into the die-casting mold, and the form fit is created immediately during the manufacture of the add-on parts. Due to the appropriate pressure during die casting, both the fixation the attachments to the pipe part as well as the pressure tightness guaranteed. _ ..

According to a further embodiment, there is the tubular part from steel. Steel cylinders of this type can have standardized and inexpensive dimensions depending on the application and, for example, can also be adopted from other product applications. The steel cylinders are inserted directly into the Aluminum or zinc die-cast attachments are integrated.

In addition, it is provided that the pipe part consists of a Deep-drawn part. This manufacturing process also enables the cylinder to be manufactured inexpensively possible, so that not only the weight but also the surface stress of the cylinder is taken into account will.

To achieve a perfect form fit between the pipe part and the attachments is provided according to a further feature that the pipe part in the fastening area the attachment part (s) are (is) provided with longitudinal and / or circumferential recesses.

A simple production of the recesses is guaranteed if the recesses as Knurling, rolling or the like are formed.

Preferred embodiments of the invention are shown in Drawings shown schematically.

It shows:

Figure 1 shows a cylinder with attachments, piston rod and seal in view

FIG. 2 shows the cylinder shown in FIG. 1 in section

Figure 3 and 4 show the fastening device as well the attachments included in the view

Figure 5 shows the attachment shown in Figure 3 in section

The cylinder 1 shown in Figure 1 consists essentially of the pipe part 2 »the attachment 3 and 4, the Dust protection cap 5 as well as the piston rod 6 acting on the piston. The attachment 4 has a receiving seat for the dust cap 5 provided. The attachment 3 is with a connection 7 for the pressure line and a Connection 8 is provided to accommodate a venting device. The cast flange 9 of the attachment 3 is over a hole 1o can be attached to the corresponding desired location of a vehicle.

FIG. 2 shows the cylinder 1 in section, a piston 11 being guided in the cylindrical interior of the tubular part 2 and is sealed off from the running surface 13 of the cylindrical tubular part 2 via a seal 12. In the cavity 14 is the hydraulic fluid, which is pressurized by the piston 11. To repatriation of the piston 11, the spring 15 is used. The piston rod 6 is received in a recess in the piston Ii and led.

PRP 433 · "* --- * ^{7: -::} '': -." *: 06/15/1983

The add-on parts 3 and 4 are positively connected to the tubular part 2 via knurling 16. Through the corresponding pressure during the die-casting of the add-on parts 3 and 4, the knurling 16 creates a form-fitting, pressure-tight and firm connection with the pipe part 2.

In the tube part 2 designed as a deep-drawn part, a bore 18 is provided in the bottom 17 of the tube part, which with a corresponding bore 19 of the connecting part works together and serves to connect to the pressure pipe network to be connected. The flange 9 is provided with a bore 1o for fastening. With an appropriately chosen combination of materials, a construct such a composite structure according to the loads. The thin-walled deep-drawn part made of steel ensures a perfect seal between the seal 12 and the running surface 13, so that the corresponding fit can be designed exactly.

Figures 3 and 4 show as an individual part the attachment 3 with the flange 9 and the corresponding through hole 1o, with a connection 7 for the pressure line and 8 is provided for ventilation.

In FIG. 5, a section of the attachment 3 shows the connection with the pipe part 2, the connection 8 being provided with a vent screw 2o. The connection 7 is used to accommodate the pressure line, a connection to the cavity 14 of the pipe part 2 being provided via the connecting channel 1 \.

PRP 433 - - g - 6/15/1983

Reference symbols

1 - ZyI Indian 2 - Roasted egg 1 2 _ Attachment 4 - Attachment 5 - Dust protection cap 6 - Piston rod 7 - Connection for pressure line 8th - Connection for ventilation 9 - flange 1ο - drilling 11 - Pistons 12 - poetry 13 - Tread 14 - Cavity 15 - feather 16 - Knurling 17 - floor 18 - Boring of the pipe part 19 - Bore of the connection part 2ο - Vent screw CVJ Connection channel

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Claims (7)

BÖGE GmbH - ^: - -> 1- --'- 15.6.1983 Bogestrasse 5o PRP 52ο8 Eitorf St / do Claims ylinder for hydraulic systems, in particular for motor vehicles, consisting of a housing with a axial bore in which a piston is axially displaceable and on one side with hydraulic Fluid is applied, the cylinder with connections for at least one pressure line, one Connection to a liquid chamber and for attachment is provided, characterized in that the part of the housing containing the bore (13) (1) from a pipe part (2) and the at least one attachment part (3, 4) having the connections (7, 8, 9) Die-casting consists, the pipe part (2) and the attachment part (s) (3, 4) being fixed and pressure-tight with one another are connected. 2. Cylinder for hydraulic systems according to claim 1, characterized in that that the add-on parts (3, 4) with the pipe part (2) are permanently and positively connected to one another. 3. cylinder for hydraulic systems according to claim 1 and 2, characterized in that that the form fit between the components (2, 3, 4) is produced during the die-casting of the attachments (3, 4) will. PRP 433 ■ :: - 2 ---- "· - '-] June 15, 1983 4. cylinder for hydraulic systems according to claim 1, characterized in that that the pipe part (2) consists of steel. 5. cylinder for hydraulic systems according to claim 1, characterized in that that the pipe part (2) consists of a deep-drawn part. 6. cylinder for hydraulic systems according to claim 1, characterized, that the pipe part (2) in the fastening area of the Attachments (3, 4) with longitudinal and / or circumferential Recesses are (is) provided. 7. cylinder for hydraulic systems according to claim 6, characterized, that the recesses as knurling (16), rolling or the like are formed.