DE1430633A1 - Pressure medium valve - Google Patents

Description

H3063-3

Gl / Kö R ₀ No. ₀ 8219

Attachment to

- ^^ "β * ι

Expl.

ROBB R! P BOSCH α @ Η, Stuttgart, Breitaoheidstr ,, 4

Pressure valve

The JSi'findung relates to a pressure medium valve ₉ , in particular to a brake valve for internal brake booster in motor vehicles, with a single , essentially planar shut-off element βμρ flexible material for two coaxially arranged and "axially movable valve seats" _

-2-

9098 36/03 47 BADOfUGiNAL

■: ■ - "143063a

Robert- Boo ab GmbH ff-t.'Kö Κ, Ιϊγ. 8219. "

Stuttgart 29.7, 1904

In such "known double seat valves" the shut-off element consists of a rigid "supporting body" in a metal ring. or a metal washer and a rubber sleeve attached to it as dieJitmittel «The pressure _{relief valve is blocked in all directions in these valves 5} if both valve seats are gon the rubber sheet at the same time; of the Absprrgieds are pressed. In order to avoid the difficulty of a plane-parallel guidance of the two axially movable valve seats against the shut-off element ₃ , a relatively thick layer of soft and elastiochemical rubber was applied to the supporting body of the shut-off element, in which the valve seats are more or less in their final position deep ^ e. _{Bollien e} Sa dig in after their inclined position. However, it has been shown that a good seal could only be achieved for a limited period, namely as long as the rubber layer had not yet lost its softness and elasticity through aging Deviation no longer with its protruding part to deform the Gummiachioht up to the completely full contact, so that pressure medium could penetrate between the protruding part and the rubber layer and thus a perfect working of the valve was impaired.

to avoid this disadvantage are valve in the pressure medium According to the invention, the fastening areas of the shut-off element assigned to the individual valve seats can be elastically twisted against one another provided on a metallic support body.

Such a design of the shut-off element is achieved, that with non-plane-parallel valve seats the same naoh one Aging of the yielding rubber schioht through a relatively J * alchtQB twisting the shut-off member in itself a full Both valve seats come into contact with the shut-off element.

9 0 98 3 6/0 3 4 7 bad oriqwal

Robert Bosch GMBH_ . Gl / KÖ R ₀ No. ₀ 8219

-Stuttgart. 29o7o1964

Further features of the invention emerge from the following Description and the drawing showing a vacuum <= brake booster ~ shows ker cylinder with control valve partially in section »

The brake booster has a cylinder pot 1, a cover 2 attached to it, and a piston 3 that can be displaced in the pot 1. The piston 3 is supported by three radial levers 4 on a disk 5 with an actuating rod β for an oil pressure cylinder (not shown) and on a sleeve 7 which is pushed onto a rod 8 protruding through a central opening 3 * in the piston 3. ™

The rod 8 rests with its collar 9 on a shoulder 10 of an actuator or an adjusting sleeve 11 of a pole valve 1st with a pan 12, a sleeve 13 and a snap ring 14 fixed in the adjusting sleeve 11 · The end provided with the collar 9 the rod 8 is designed like a pan and, together with the pan 12, takes one end of a control linkage provided with a ball 15 16 articulated, which is hinged to a brake pedal 17

The Stellhülae 11 is arranged axially displaceably in a mounted on the front of the piston 3 support bearings 20 and in a further thrust bearing 21, which isto inserted into a centrally μ on the cover 2 integrally formed neck 22 In addition to the thrust bearing 21 23 is seated a sealing sleeve in the neck 22 , which is secured by an annular disk 24 and a wire ring 25. Another wire ring 26 inserted into an annular groove on the adjusting sleeve 11 rests against the support bearing 20 and serves as a travel limit stop for the adjusting sleeve 11 "

The control valve designed as a long valve for the brake booster consists of an annular one in the adjusting sleeve 11 on the

909836/0347

-4- H30633

Robert Bosch GmbH ~ Gl / Kö R _o no _c 8219

Stuttgart 29ο7ο1964

Rod 8 axially movably arranged shut-off member 30 and from two coaxial valve seats 31 and 32 ₉ cooperating with it, one of which 31 on the end of the adjusting sleeve 11 facing the piston 3 against its interior and the other 32 on the central port 3 ', the piston 3 The diameters of the two valve seats 31 and 32 are dimensioned so that the valve seat 32 on the piston 3 can be moved axially in the valve seat 31 of the adjusting sleeve 11 while leaving an annular gap made of a flexible material ₈ such as rubber, existing shut-off member 30 with its flat sealing surface pressed by a spring 33 against the valve seat 31 of the stud sleeve 11, the spring 33 on one side on the collar 9 of the rod 8 and on the other side supported on a support ring 34 connected to the shut-off member 30, for example by vulcanization, “whose cross-section is angular and whose outside is angular The inner diameter of the support ring 34 is smaller than that of the valve seat 31 of the adjusting sleeve 11, but larger than that of the valve seat 32 on the piston 3 ₉ so that the support ring 34 is only in axial alignment with the outer one The valve seat 31 is and thus stiffened the support ring 34 in the area of this valve seat 31 .36 is pressed against the rod 8 «The lip 35, in particular its extension, which is essentially in axial congruence with the inner valve seat 32, forms a stiffening or reinforcement for the inner annular region of the shut-off element 30 which interacts with this valve seat;

so that the two ring areas of the shut-off member »30 through the reinforced intermediate area easily twisted against each other

909 8 36/03 47

BAD ORiQINAL

U30633

Robert Bosch GmbH Gl / Kö R ₀ No. ₀ 8219

Stuttgart 29 ο7ο 1964

The mode of operation of the Bremsveratärkera and its control valve is as follows:

In the position shown, the normal or driving position of the _{brake booster 9} operated by U & terdiriaek, the shut-off element lies on the valve seat 31 of the adjusting sleeve 11 on ₉ while the other valve seat 32 is free. Buroh the central opening of the piston 3, the chambers of the cylinder, separated by the piston 3, are connected to each other, so that with the same pressure in the two chambers, a return spring 40 pushes the piston 3 into the right end position a negative pressure generated by sucking in the air through a nozzle 43 provided on the rear wall and connected to the suction line of the motor vehicle engine.

äuin initiation of a working movement of the piston 3 is the StellhUXeo Ii through the pedal 1? and the pusher linkage 16 together with the rod 8 and the shut-off member 30 moved nash to the left, so that the shut-off member ^ O with its sealing surface initially also rests on the yentiluits 32 of the piston 3 and finally the valve 30 lifts off »This initially causes the? Oj.'h: a7.du'rtg- of the two chambers on both sides of the piston 3 to be interrupted« »» /.h *! Then the adjusting sleeve 11 »went through holes 41 and Xn OUa-Pfisnna 12 and the collar 9 of the rod 8 and the gap formed by the awischea« U / u »entilsita 3i and the shut-off member 30, the : * Gate dam piston 3 with the outside air _o verbuiaden By that, 'jG! 3 <ihafföne <n üruekunt he left in the two chambers dee Zy ~ XiMUiM, the piston 3 aaeh moves left, "If the Steuerbewe gimg of. StelXhülse 11 is stopped or * the Bremapedala 17, comes auoU the Ventilsita 3i of the adjusting sleeve 11 again in sealing contact with the shut-off element 30, so that the inflow of further Lv.ft under atmospheric pressure is prevented and you see a

909836 / 03A7 BATHROOM

-6- U30633

Robert Bosch QmVB. Gl / Kö B ₃ No. ₀ 8219

Stuttgart, July 29, 1964

Gleisligewishtslaga swisshen on the operating rod 6 we · = k @ xu! $ n braking force and the piston force and mus acting against it kelkraft adjusts, whereby the muscle strength and the piston force over the lever 4 transferred to the disk 5 of the actuator β

In this position of the brake booster it is important that both valve seats 31 and 32 seal properly with your shut-off member '30, so that the pressure difference on both sides of the Kel · = bens 3, Bai was not exactly plane-parallel Yentilsitssn the two reinforced ring areas of the shut-off member 30 can lie tightly against the valve seats 31 and 32 with twisting of the same «,

To release the brake or return the piston »3. to its normal pitch, the brake pedal 1? relieved-. As a result, the balanced system comes out of the Slaishgev / ioht, whereby the ends of the levers 4 connected to the muff © 1. are pivoted against the piston 3 ₉ while the piston 3 is nooh under pressure on its front side of this, the control sleeve 11 is moved nash to the right by the rod 8 ₉ so that the valve seat 32 d @ s piston 3 is released again and thereby the pressure swivel chamber is connected to the ßleishdruekkammer _ö The return spring 40 can now & Qn piston 3 ₉ the adjusting sleeve 11 and the control rod 16 Move nash rsob.ts to their normal position.

In addition, it is noted that the inventive design of the shut-off element with two ring regions that can be twisted against one another is niohi; limited only to the exemplary embodiment described. Ba 1st example, also possible, both ring portions of the elastic Abaperrglieds duroh metallic rings or "at a auagebildeten as a plate obturator duroh a ring and / or plate to reinforce the metal ..aus"

BATH

909836/0347

Claims (3)

j H30633 iloba \? 1; «Iosch Giabi; Gl / Kö R.lir * 8219 • Stuttgart July 29, 1964 Claims 1) Pressure medium valve, in particular brake valve for negative pressure Bremevexretärkex ¹ in motor vehicles, with a single, essentially flat shut-off element made of flexible material for two coaxially arranged and axially movable yen »tilaitze, characterized in that the ring area assigned to the individual valve seats? 4i $ shut-off elements are provided on a metallic support body so that they can be twisted elastically against each other * 2) pressure medium valve according to claim 1, characterized in that the support body the sealing substance dta shut-off member only in; Area of one of the two valve seats 3) Druokmittelventil according to claims 1 and 2, daduroh gekenn-Baiahnet that the support body has the shape "ines ring" that the inner diameter is larger than the diameter of the smaller valve seat and de.8 the sealing substance for Deokung with the smaller valve seat over the inner edge of the Support body protrudes » A) Pressure medium valve according to claims 1 and 2, which shows that the 3 does elco r ρ er 'has the shape of a plate, the outer diameter of which is smaller than the diameter of the larger valve seat and that the sealing material has a similar outer edge to cover with the larger valve seat over the edge 4 * »StiltB5ki5e? *? it protrudes» '' 909836 / 03A7 - " ~ '' L e r s e i t e