DE1881022U - PRESSURE ACTUATED SERVO DEVICE. - Google Patents

Description

PATENT ADVOCATE

DiPL-ING. ERICH SCHUBERT

Abs .: Patent attorney Dipl.-Ing. SCHUBERT, 59 Siegen (Westphalia), P.O. Box 325 Oranienstrasse 14

63 199 Rae./schö

.362 5 75 - A. 6.63

Phone: 22802
Telegram addr .: Patschub, Siegen Postal check accounts:

Cologne 106931, Essen 203 62 Bank accounts:
Deutsche Bank AG.,
BranchesSiegen and Oberhausen (RhId.)

May 31, 1963

Company AUiDOMOTIVE PRODUCTS GOMPALY LIMITED? Tachbrook Road, Leamington Spa, Warwickshire, England

FiXx this application takes priority from the British patent application Ir. 21 772/62 of June 5, 1962 claimed.

Pressure operated servo device

The hiring concerns those actuated by the pressure of a medium Servo devices, e.g. vacuum servo devices of the type in which by the action of a valve / s the. on the piston

or the diaphragm of the servo device acting pressure difference is created, while the Yentil in turn through the pressure of a liquid or other medium '* is actuated.

In known servo devices of this type, the piston or the diaphragm with the component is connected to be actuated by a pressure member, for example by a rod, wherein the pressure medium for actuating the servo

■ 35 · control valve through a pipe, for example a flexible one is fed, which often runs outside of the servo device. According to the control, there is an improved construction proposed a servo device of the type described above, in which the pressure member for feeding the Pressure of a liquid or other medium can be used to actuate the Yentile, according to the hiring therefore, in a servo device of the type described above, the pressure member, which the piston or the membrane of the servo device with the "actuated component" couples with a

^! Connecting line or equipped with a channel that can be connected to a pressure source and to a chamber in which an axially displaceable piston is assigned to the movable valve part of the servo control valve in terms of drive, the pressure medium being fed through the connection

line reaches the chamber and an axial displacement of the piston for the purpose of actuating the valve.

I am a special area of application of the furnace in servo devices that belong to the braking system of a road vehicle, and subsequently becomes a vacuum servo device to generate an additional acting on the brakes of a hydraulic brake system of a road vehicle Pressure based on the output of the device, for example Drawings described in detail in which

Fig. 1 shows the servo device in longitudinal section,

while
Fig. 2 is a section along the line II-II in Fig.

shows.

The vacuum servo device shown in the drawings corresponds generally to the known design and represents a self-contained unit in which a servo cylinder 1 has a piston 2, uiü. in which a valve 3 is used to control the air supply to one side of the piston in order to enable the servo device and a hydraulic master cylinder 4 to be operated, which is arranged coaxially with the servo cylinder. The piston of the master cylinder is driven via a pressure member

connected to the servo piston in the servo cylinder. The operation of the operation is done to shut off one side of the * servo piston of the vacuum source and for supplying air for movement of the servo piston or diaphragm by hydraulic means from the actuated via a pedal hydraulic master cylinder within the brake system _F, the? / Valve pus described in detail below 3 is arranged inside the cylinder 1 on the air inlet side of the servo piston, the air inlet opening 6 of the valve being connected to a inlet pipe via a flexible pipe 7.

line 3 is connected, through which there is a connection to the atmosphere. The master cylinder 4 is on the vacuum side of the servo piston 2 and extends partly into the cylinder. The main cylinder is in the area its outer end by a closed closure v / and 9 of the cylinder 1 and in the region of its inner end supported by a disk 10 in the cylinder, the disk containing through openings 11. A passage 12 in the end wall 9 of the cylinder 1 can be connected to a vacuum source, e.g. Vehicle engine. In the passage 12 is preferably a spring-loaded check valve 13 is arranged.

In the construction of the vacuum servo device described so far exists according to one embodiment of the innovation

- ■■■. ■■■ "■ 5 - '

the pressure member 5 from a tube, which is thus subsequently is to be referred to as tube 5, in which there is a bore 14 "which provides a connection path for the hydraulic Forms medium that causes the servo valve to operate. The tube 5 extends in the axial direction inside of cylinder 1, one end of which is through a chamber 15 at the inner end of the hydraulic master cylinder 4 passes through while the end of the tube. 5 protrudes into the bore of the master cylinder and with the piston 16 of the master cylinder can be brought into single engagement. The chamber 15 has a passage 17 through its v / andung, via a pipe 13 with a connector 19 in the end wall 9 of the servo cylinder is in communication. The connection piece can be operated on your with a pedal Master cylinder to be connected. The chamber 15 is at one end in the direction of the space behind the piston 16 of the main cylinder opened while the other end of the Chamber is sealed against the interior of the servo cylinder. The section extending through the chamber 15 of the tube 5 contains radially directed bores 20 through which hydraulic fluid flows from the chamber into the bore of the pipe can flow. The end of the tube 5, which compared to that in the area of the master cylinder piston is located, extends into a socket 21 to which it is attached. The socket in turn is at a centrally located

lowing guide section 22 supported on the servo piston, with the guide cut on the inside of the piston is arranged and contains openings 23. The bushing 21 forms a chamber 24 which communicates with the bore of the tube 5 is in communication via an axial bore 25 within the bushing. In the chamber 24 there is an axial piston 26 movably mounted. The outer end of this piston is in contact with one end of a rod 27, -die.mit one annular component 28 is connected, the middle. , Opening 29 a connection between the opposite sides of the servo piston. The annular component 28 forms part of the servo control valve 3.

The annular component is mounted so that it can perform an axial displacement. For this purpose it sits on a flexible diaphragm 30 which extends over the outside of the servo piston. The membrane consists of one piece with a sleeve 31, which surrounds the circumference of the servo piston, so that the piston is sealed airtight and watertight all around. The sleeve 31 is folded at its edge 32, which is clamped between the circumferential flanges 33 of prefabricated sections of the sex cylinder 1. During the axial movement of the Bervo piston 2, the sleeve rolls back by itself. The Kthrungsabschnitt 22 has recesses that form a space behind the membrane 30? the membrane is around the circumference of the space ZTvischen a support cross 35 and the outer surface of the

Servo piston with the help of a ring of clamping screws'36 Stiffened, üine compression spring 37, which between the annular Component 28 and the spider 35 acts, generates a! Spring force, which normally biases the annular member in the direction of the piston 26, the ^ ederlast also acts on the inner end of the chamber 24 via the rod 27. In this position, the annular component is of a 'poppet valve 38 pushed away, which has a closure for de \ L central opening of the annular component 28 forms. Bas'! Poppet valve sits on one end of a plunger 39? on dessei the other end a second poppet valve 40 is provided. The valve stem is pretensioned by a compression spring 41 so that that it normally presses the second poppet valve onto a seat surface 42 which has an air inlet opening 43 for supplying air on one side of the servo piston. The Lu.ftei.nl Aß opening 43 is located in a wall of a valve chamber 44 in the spider 35, while the air inlet 6 in another wall of the valve chamber is provided.

In the inoperative state of the servo device shown in the drawings are the opposite sides of the servo piston 2 via the central opening of the annular Component 28 in sighting on the vacuum open, the second

Disk valve 40 is held on its seat, around the Keep the air inlet closed. When the brake

Pedales arrives, τοη the pedal "actuated master cylinder Hydraulic fluid into tube 5 and into the piston chamber 24 from the pipe bore "", so that an outwardly directed axial displacement of the piston 26 occurs. This movement of the iiolbens 26 is on the rod 27 on the ring-shaped Transferred component 28, so that it is displaced in the direction of the closed state of the sump valve 38 will. When the central opening of the annular component 28 is closed by the poppet valve 38, a Side of the servo piston 2 closed off from the yakuum source. The continued movement of the piston 26 causes thus an axial movement of the valve tappet 39? so that. the ZY / eite rope valve 40 is lifted from its seat is so that in the closed by the vacuum source Side of the servo piston air can flow in. The resulting axial movement of the piston causes a corresponding movement of the master cylinder piston, the Pressure is transmitted via the pipe 5 .. ■

The hiring also relates to modifications of the embodiment outlined in the appended claim 1 and protection refers above all to all idle features, which in the individual - or in 'combinai / ion - in the entire original application documents are disclosed. ■ '.

Protection claims

Claims (1)

1. Pressure operated servo device, characterized in that that the piston or the diaphragm of the servo device with the pressure member coupling a connecting line to the component to be actuated contains, which is connected to a pressure source of a hydraulic or other medium for actuating a valve that controls the operation of the servo device. 2. Servor device according to claim 1, characterized in that that the connecting line in the pressure member can also be connected to a chamber in which an axially displaceable The piston drives the movable valve part of the tax ServcAentils is assigned, whereby the connection line medium supplied to the chamber causes an axial displacement of the piston to actuate the valve. p. Device according to claim 1 or 2, characterized in that that a displaceable piston is mounted in a servo cylinder, that a servo-actuated master cylinder is coaxial arranged to the Seryozyliiider and supported by this is that a pressure member drivingly connects the servo piston to the / piston of the master cylinder, and that a pressure actuated Tentil is provided for controlling the operation of the servo device, the medium for actuating the Yentiles is fed to a Y-valve actuating device via a connecting line in the pressure member. 4. Device according to claim 3) ο the 4, characterized in that that the pressure member is an ear. 5. Device according to claim 3? characterized in that the servo control valve sits on the servo piston and moves with it. - 6. Apparatus according to claim S, characterized in that the servo control valve includes a membrane on a Side of the servo piston is attached. 7. Apparatus according to claim 6, characterized in that the membrane 'consists of one piece with a flexible sleeve, which surrounds the circumference of the servo piston, and that the sleeve is a. Sealing between the servo piston and the cylinder forms. .