DE1072111B - - Google Patents

Description

The Lrl'indiing refers to l'Tilhuigsgler for air suspension clcincnlc on motor vehicles with a moving in a longitudinal bore when the distance between the wheel axle and the vehicle frame is greater, essentially cylindrical actuator for the liinlati- and the Auslatlventil of the Ueglers as well with a seal that prevents air from escaping through the ducting gap.

If the mentioned, heavily used I caution with these controllers, for example due to wear and tear of the lip lips. decreases, air is constantly escaping from the uimiiltelbai in front of the Liihruiigsspalt Fc-dcrtingsclcnienien. As long as the lift losses are low and the oil pressure generation plant is working this is not a concern because then the suspension elements from the air compressor and storage container continuously refilled via the filling regulator. Tiei a vehicle parked for a long time However, gradually so much compressed air can escape from the system through the leakage mentioned flow out, because the suspension is insufficient and so the Lalirzcug is no longer (normally) drivable.

To remedy this situation, the Fedeningselemeiite and the storage tank of the compressed air system must be to be replenished. This requires either a normal flow rate for an air pump, as it is sufficient for the ongoing supply of the suspension elements while driving, quite a long time Time or, if this is not to be accepted, an air compressor with a significantly higher flow rate, so additional construction work.

According to the FrTmduug, this disadvantage can now be countered in a simple manner by adding the actuator is designed and arranged so that it is in addition to the existing gap seal of the actuator a second sealing point forms as soon as the actuator determines a filling stroke when the suspension drops Size executes.

Iiei this arrangement is indeed initially ul> he (lic mentioned leak point pressure air from the Fede- 4 "ningseleinenten lost as well as with the Füllungsregleru the previous design. Sow.ie However, due to low suspension, the actuator of the filling regulator a certain stroke has made, comes after the Frtindung additional. seal about. the air pressure in the suspension elements can then not my "decline, that is, he still retains the / um Liiilialteii the normal position of the vehicle frame (with the respective Tieladungszustand) sufficient fTühc. 5"

Fin with a Kiillngsgler after the early equipped vehicle is so even after long Tietrieiispauseii in any case still (normally) drivable, and his air generation system does not need Filling regulators for air suspension elements on motor vehicles

Applicant: Robert Bosch G.m.b.H., Stuttgart-W, Breitscheidstr. 4th

to be dimensioned for a higher delivery rate than usual.

An exemplary embodiment of the invention is shown in the drawing. It shows

Fig. 1 is a partial section through a filling regulator according to the invention and

Fig.

2 a modification of the
with regard to a detail,
again in the cut.

A controller housing 1 has a valve tube 3 for an axial distance between the wheel axle and the actuator, here a valve tube 3. The outside diameter of the valve tube is slightly smaller than the diameter of the bore 2, so that an annular gap 4 remains free between the two parts.

The guide bore 2 ends on the right in a housing space 5. This is connected to the outside air; it takes on a linkage, not shown, which adjusts the valve tube in a known manner according to the distance between the wheel axle and the vehicle frame. When the distance decreases, for example when the air pressure in the suspension elements decreases or when the vehicle load increases, the valve tube 3 is pushed from right to left.

On the left-hand side, the guide tube 2 merges into an equiaxed bore 6 of larger diameter within a connecting piece 7 on the housing 1 . A compressed air generation ailage, not shown, of conventional design with a storage container is connected to this bore via a Schranbstutzenii 8 leaking it.

From another socket bore 9 attached to the side of the housing 1 , a bore 10 leads to a groove 11 screwed into the wall near the left end of the guide nut .

909 690/356

Regulator something

according to Fig. 1 enlarged.

Guide hole 2 when changing the vehicle frame

Claims (4)

tion 9 are. Avas, in turn, is not shown, one or more suspension elements connected. The valve tube 3 has a continuous longitudinal bore 12, the right end of which opens into the space 5. The left end of the valve tube 2 and also the edge of the mouth of the bore 2 in the nozzle bore 6 are formed into valve seats 13 and 14, respectively. These interact with the sealing surface 15 of a plate 16, which slides with play in the bore 6 and is under the force of a valve spring 17 supported on the screw connector 8. The valve spring 17 seeks to press the plate 16 to the right against the valve seat 14. In a certain position, the so-called normal position of the filling regulator, the valve disk 15, 16 keeps the two seats 13 and 14 closed. This position corresponds to the static normal position of the vehicle frame in relation to the wheel axle. At the right end of the guide bore is a short recess 18, on the cylindrical wall 19 of which the mouth 20 of the bore 2 overlapping faceplate seal 21 made of rubber is held. With a radially resilient sealing lip 22 directed against the gap 4, the seal 21 encompasses the valve tube 3. In the normal position of the regulator shown, a collar 23 stands on the valve tube 3 with its left flank 24 to the right of a shoulder 25 of the seal 21. On the right On the side, the seal 21, like the space 5, is under the pressure of the outside air. The space on its left side is connected to the suspension elements via the guide gap 4 and via the bores 10 and 9. On this side, the seal 21 is therefore constantly under the pressure prevailing in the suspension elements. The arrangement shown in Fig. 1 works as follows: Starting from the normal position shown, the regulator reaches its filling position by pushing the valve tube 3 to the left by the drive means mentioned. In this position, the plate 16 is lifted from the seat 14 and thus the compressed air storage tank is connected to the suspension elements via the screw-type socket 8, the bore 6, the gap 4 and via the bores 10 and 9. As soon as the filling stroke of the valve tube 3 reaches a certain size, the flange 23 runs with its flank 24 on the extension 25 of the dichroic 21. The surfaces 25 and 24 lying one on top of the other then form a sealing point downstream of the sealing lip 22. This ensures that when the regulator is full, a leak on the lip 22 is harmless and further air loss via this seal is prevented. The downstream, second sealing point 24, 25 is very effective because, when the pipe 3 is filled, it is loaded in the closing direction by the self-resilience of the seal and the air pressure on the left wall of the sealing. FIG. 2 relates to a somewhat different embodiment of the seal at the right outlet 31 of the bore 32 in the cone housing, denoted here by 33, in a regulator otherwise designed according to FIG. The guide bore 32 merges shortly before the mouth 31 with an annular groove 34 with an inserted sealing ring 36 cooperating with the valve tube 35 into a short, widened liolming into which the valve tube 35 with a narrow shoulder 38 can run. If the valve tube 35 goes according to the envelope position to the left, the shoulder 38 runs against the sealing ring 36 and in turn results in a sealing point downstream of the sealing ring between the sealing ring 36 and the valve tube. The embodiment of Fig. 2 is much simpler and cheaper than that of Fig. 1, but more suitable for lighter loads. Patent claims: 1. Filling regulator for air suspension elements on motor vehicles with a substantially cylindrical actuator for the inlet and outlet valve of the regulator, which moves in the event of changes in the distance between the wheel axle and the vehicle frame, for the inlet and outlet valves of the regulator and with a seal that is effective against air leakage through the guide gap, characterized in that, that the actuator (3, 35) with the existing gap seal (22, 36) additionally forms a second sealing point (24, 25; 36, 38) as soon as it executes a filling stroke of a certain size when the suspension decreases. 2. Filling regulator according to claim 1, characterized in that the actuator (3, 35) has a Kiiigansnlz (23, 38) with which it lays itself after a certain stroke against the seal (21, 36). 3. Filling regulator according to claims 1 and 2, characterized by an end of the guide Iiohrung (2) overlapping like a cap, the valve tube (actuator 3) with a radially resilient, central Diclillippc (22) sliding comprehensive cover (21), with the outer End face (25) a collar (23) on the valve tube can form a sealing point downstream of the lip (22). 4. Filling regulator according to Claims 1 and 2, characterized in that the annular shoulder of the actuator cooperates with an O-ring seal (36) inserted into the guide bore (32) . 1 sheet of drawings © 909 690/356 12.