SE445725B

SE445725B - BRAKE VALVE FOR CONTROL OF PRESSURE MANUFACTURED TRIP BRAKE INSTALLATIONS IN MOTOR VEHICLES

Info

Publication number: SE445725B
Application number: SE8001482A
Authority: SE
Inventors: H Ulrich; A Haas
Original assignee: Wabco Fahrzeugbremsen Gmbh
Priority date: 1979-04-06
Filing date: 1980-02-26
Publication date: 1986-07-14
Also published as: FR2453059A1; SE8001482L; DE2913847A1; AT385957B; GB2051272A; IT1128401B; ATA89780A; DE2913847C2; GB2051272B; IT8067543A0; FR2453059B1

Description

8001482-2 hänför sig.därför endast till den av en pedal 2 och en tryckstång 3 bestående manöveranordningen varvid den undre änden 4 av tryckstången 3 står i förbindelse med bromsventilens 1-graderingskolv 5. En skruv 6 tjänar till inställning av ett glapp 7 som tryckstången 3 vid pedalens betjäning tillryggalägger tills tryckstången 3 ingriper med kolven 5. 8001482-2 therefore only refers to the operating device consisting of a pedal 2 and a push rod 3, the lower end 4 of the push rod 3 communicating with the brake valve 1 of the brake valve 5. A screw 6 serves to set a play 7 as the push rod 3 during pedal operation travels until the push rod 3 engages the piston 5.

En med tryckstången 3 fast förbunden manöverplatta 8 som tryckstången 3 går igenom, ger en mekanisk förbindelse med en på motorvagnsbroms- ventilen 1 med fläns fäst_tryckreglerventil 9 varvid manöverplattan S är så utbildad och anordnad att nedåtrörelse av tryckstången 3 vid manövrering av pedalen 2 överföras på tryckreglerventilens 9 tryck- stång 10 genom en tipprörelse av denna manöverplatta 8. Eedelst en på manöverplattan 8.angripande excenterskruv 11 är början av tryck- reglerventilens 9 tryckutmatning inställbar vid början av pedalens 2 manövrering. En på sidan av tryckreglerventilen och manöverplattan 8 angripande andra excenterskruv 12 tjänar till inställning av avståndet 13 som tryckreglerventilens 9 tryckstång 10 tillryggalägger varvid ett anslag 14 begränsar.detta avstånd 13: Den av excenterskruvarna 11 och 12 begränsade tipprörelsen 13 hos manöverplattan 8 möjliggöres genom det fria spelet hos en motsvarande utformad, mellan tryckstången 3 och hålet i manöverplattan 8 anordnad bussning 15 varvid manöverplattan 8 nedåt stöder sig på en skiva 18 vars med manöverplattan 8 följande tipprörelse möjliggöres genom en under denna skiva 16 i tryckstången 3 anordnad rulle 17;oBussningens 15 anpressning mot manöverplattan 8 och dessa båda delars 15 och 8 mot skivan 16 sker med en förspänd fjäder 18 i pedalens 2 resp tryckstångens 3 rörelseriktning.A control plate 8 connected to the pressure rod 3 through which the pressure rod 3 passes provides a mechanical connection with a pressure regulating valve 9 attached to the motor vehicle brake valve 1, the control plate S being so formed and arranged that downward movement of the pressure rod 3 is transmitted to the pressure regulator 9 push rod 10 through a tilting movement of this control plate 8. First of all, an eccentric screw 11 engaging on the control plate 8. the beginning of the pressure output of the pressure control valve 9 is adjustable at the beginning of the operation of the pedal 2. A second eccentric screw 12 engaging on the side of the pressure control valve and the control plate 8 serves to adjust the distance 13 which the pressure rod 10 of the pressure control valve 9 travels, a stop 14 limiting this distance 13: The tipping movement 13 of the control plate 8 limited by the eccentric screws 11 and 12 is made possible. the play of a correspondingly shaped bushing 15 arranged between the push rod 3 and the hole in the actuating plate 8, the actuating plate 8 resting downwards on a disc 18 whose following tilting movement with the actuating plate 8 is made possible by a roller 17 arranged below this disc 16 in the push rod 3; against the operating plate 8 and these two parts 15 and 8 against the disc 16 takes place with a prestressed spring 18 in the direction of movement of the pedal 2 and the push rod 3, respectively.

Mera utöver vad ovan sagts om kännetecken för uppfinningsföre- målet framgår av följande funktionsbeskrivning.More in addition to what has been said above about the characteristics of the object of the invention appears from the following functional description.

.När föraren betjänar pedalen 2 rör sig bromsventilens 1 tryck- stång 3 först utan att påverka reglerkolven 5 nedåt. Den därvid med excenterskruven 11 inställda samtidigt inledda tipprörelsen av den vid tryokstången 3 fästa manöverplattan 8 flyttar tryckreglerventilens 9 tryckstång 10 likaledes nedåt så att under stängande av en utloppe- ventil 19 en inloppsventil 20 öppnas och låter tryckmedel över en inloppsanslutning 21 och en utloppsanslutning 22 strömma igenom till retardern. Den med excenterskruven 12 inställda Sträckan 15 på manöver plattan 8 tillåter till manöverplattans 8 anslag 14 en steglös, fin- _ känslig bromsning med retardern. Här anslaget 14 uppnås är samtidigt " tryckstångens 3 glapp 7 övervunnet - tryckstångens 3 glapp 7 motsvarar alltså manövrerplattans 8 sträcka 13 - och den nu av tryckstången 3 medförda graderingskolven 5 stänger en utloppsventil 5, 23 och öppnarWhen the driver operates the pedal 2, the push rod 3 of the brake valve 1 first moves downwards without affecting the control piston 5. The tipping movement of the control plate 8 attached to the pressure rod 3, which is set at the same time with the eccentric screw 11, also moves the pressure rod 10 of the pressure control valve 9 downwards so that while closing an outlet valve 19 an inlet valve 20 opens and allows pressure means over an inlet outlet connection 21. through to the retarder. The distance 15 of the control plate 8 set with the eccentric screw 12 allows the stop 14 of the control plate 8 a stepless, fine-sensitive braking with the retarder. Here the abutment 14 is achieved, at the same time "the play 7 of the push rod 3 is overcome - the play 7 of the push rod 3 thus corresponds to the distance 13 of the operating plate 8 - and the graduating piston 5 now carried by the push rod 3 closes an outlet valve 5, 23 and opens

Claims

8001482-2 an inlet valve 5, 24. Compressed air now flows over an inlet connection 25 and over an outlet connection 26 to the wheel brake cylinders. In the two-circuit motor vehicle brake valve 1 described here, compressed air simultaneously flows during closing of a second outlet valve 27 over a second inlet valve 28, a second inlet valve 29 and a second outlet valve 30 into the wheel brake cylinders of the second brake circuit. The overcoming of the force from the prestressed compression spring 18 arranged around the push rod 3 gives the driver a noticeable pressure point at the pedal 2 when the input to the service brake circuit begins. From this point on, the pressure in the third brake, ie the braking effect of the retarder, remains constant. It is possible to use the invention also in vehicle brakes whose pedal operation is transferred to a motor vehicle brake valve by means of rods. Claims:

Brake valve for regulating pressure medium-operated service brake systems in motor vehicles with a supplementary control device for an auxiliary service brake system independent of the service brake system, wherein the actuator of the brake valve (1) comprises a first transmission rod (3) directly or through a shut-off transmission 2), partly the first push rod (3) is connected to a graduating piston (5), which controls the service brake, and partly the independent auxiliary service brake in the form of a retarder is controlled by the actuating movement of the brake pedal (2) by a control element, characterized in consists of a pressure control valve (9) connected to the brake valve (1) or on it, which is actuated by a second pressure rod (10), and that a mechanical transfer element in the form of a control plate with depending on the actuating movement of the first pressure rod (3) varying inclination transmits the actuating movement of the brake pedal (2) to the second push rod (10).

Brake valve according to Claim 1, characterized in that the first push rod (3) passes through a slide in the control plate (8) and is fixedly connected thereto. '

Brake valve according to Claim 2, characterized in that the fixed coupling lnellnn (len first pressure rod (3) and rranoverplutluri (8) consists partly of one arranged around the first pressure rod (3) as a lower support for the control plate (8) formed 8001482- 2 disc (16), partly a support roller (17) guided in one heel in the first push rod (3) for the disc (16), partly one between the wall of the hole 1 of the control plate (8) and the first push rod (3) passing through the hole arranged bushing (15), and partly a spring (18), which in the axial direction partly clamps the bushing (15) against the control plate and partly closes the bushing (15) and the control plate (8) jointly against the disc (16).

Brake valve according to Claim 3, characterized in that the inner surface of the bushing (15) abutting the first pressure rod (3) is convexly curved to accommodate the varying inclination of the control plate (8).

S. Brake valve according to one of Claims 1 to h, characterized in that the control plate (8) for transmitting the movement of the brake pedal (2) supports with one end against the other push rod (10).

Brake valve according to Claim 5, characterized in that an eccentric screw (11) for adjusting the contact point between the control plate (8) and the second push rod (10) engages the control plate (8).

Brake valve according to Claim 6, characterized in that a second eccentric screw (12) forms a stop which can be adjusted in the operating direction of the operating plate (8) for determining the limit of the operating distance of the second push rod (10).