DE7442273U1 - Switch for pneumatic lines - Google Patents

Description

Daimler-Benz Aktiengesellschaft Daim 10 1 * 88 A Stutteart-Untertürkheim Switch for pneumatic lines

The invention relates to a switch for pneumatic lines, in particular for pneumatic lines in motor vehicles, the housing of which has a cylindrical recess, in which a longitudinally displaceable control slide is guided, which depending on the position, a first pneumatic line connects to a second or third pneumatic line and in which on the part lying in the recess is pushed onto a tubular rubber part, which is attached to its ends on the wall of the recess under bias sealing edges all around, through which a sealed annular space is created between the wall and the rubber part, in which two pneumatic ones at different positions of the control slide Lines merge.

The invention is based on the 'ufgäbe, a switch of To create the type mentioned at the beginning, in which, in addition to low production costs for series production, also rapid assembly of the control spool is possible with the corresponding actuation linkage.

The object is achieved according to the invention in that the end of both sealing edges with the respective end of the rubber part form a common end face in which an annular groove is arranged is.

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In a preferred embodiment, according to the invention, the Annular grooves - seen in cross section - formed triangular being.

The inventive design of the sealing edges creates a flexibility that ensures a permanent sealing effect even in the case of unevenness on the inner wall of the cylindrically shaped housing of the switch.

The switch can be easily mounted with such operating rods that, due to their design Do not allow any rotation, since the valve slide of the switch is arranged to be rotatable about its longitudinal axis and is thus in any desired position can be brought.

The seal does not lose its effectiveness. In addition, the functionality of the switch is not affected by the possible occurrence of transverse forces in such a way that cladding occurs inside the housing of the switch, which makes the switching force required for moving the control slide unacceptably high.

In the drawing, the subject matter of the invention is shown in more detail using an exemplary embodiment shown in longitudinal section.

A switch 1 essentially consists of a cylindrically shaped housing 2, three pneumatic lines 3, k, 5 arranged in a row - seen in the longitudinal direction - and a pin-shaped control slide 6, which is positioned almost over the

7442273 05/24/78

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Housing length aich extending circular recess 7 longitudinally displaceable iat. Housing and pneumatic tubing; services are designed in one piece. :

On the housing 2 lying part of the Steueraohiebera 6 j

iat a tubular rubber part 8 sucked up and against i

Longitudinal displacement secured by two collars 9 and 10 of the control slide 6. Daa Guamiteil 8 is provided at the end with a bulge-like lip-shaped sealing edge 11, 12 which, under prestress, lie sealingly all around on the wall 13 of the extension 7 and serve as a lateral delimitation of an annular space s ^ k lying between the wall 13 and the rubber part 3.

A uniform contact pressure over the entire circumference of the recess 7 is achieved - even with unevenness on the wall Recess - achieved in that the ends of the sealing edges 11, 12 have a common ί with the respective end of the rubber part 8 me end face 15t 16 and each of these end faces 15t i6 between its outer and inner diameter one with-> tig lying annular groove 17, 18 which - seen in cross section - have such a triangular shape that the legs; of the triangles that run into the sealing edge and intersect there at one point, an acute angle of approx. 15 ° form.

The rubber part 8 is made very flexible at the end in this way, whereby the unevenness on the wall 13 becomes effective can be compensated.

The part of the control slide 6 protruding from the recess 7 is provided with an actuating linkage (not shown) connected, which z. B. can be a component of a central locking system.

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The pneumatic lines J, 4, 5 and the sealing edges 11, 12 lying one behind the other are placed in such a way that two of the three openings 19, 20, 21 of the pneumatic lines located in the recess 7 between the two sealing edges 11, 12 lie so that either the pneumatic lines 3 and k or k and 5 are connected to one another via the annular space. The first-mentioned position is shown in the drawing.

The rear wall 22 of the housing 2 is provided with a... Ventilation opening 23.

The housing of the switch and the control slide are made of plastic.

Claims (2)

- 5 - Daim IO 2 * 88/1 * claims 1. Switch for pneumatic lines, especially for pneumatic lines in motor vehicles, the housing of which has a cylindrical recess in which a longitudinally displaceable control slide is guided, which, depending on the position, connects a first pneumatic line with a second or third pneumatic line and on the part lying in the recess, a tubular rubber part is firmly pushed onto the part is, which at its ends on the wall of the recess under bias sealing edges abutting all around, through which a sealed annular space is created between the wall and the rubber part, in the various Positions of the control slide each open into two pneumatic lines, characterized in that the end of both Üichtkanten (12, 1i) and the respective rubber part end form a common end face in which one Annular groove (17, 18) is arranged. 2. Switch according to claim 1, characterized in that the Annular grooves (17, 18) - seen in cross section - are triangular.