DE1576060A1 - Fluid pressure servo motor - Google Patents

Description

Detroit, Michigan (USA) December 3, 1965

Fluid pressure servo motor

The invention relates to a fluid pressure servo motor, in particular on a new type of construction of several movable walls within the servomotor novel means for actuating a control valve arranged in one of the movable walls.

Such fluid pressure motors already exist known. For example, US Pat. No. 5,096,689 describes a servomotor arrangement in which two movable walls are attached to a common tubular rope. One movable wall is included held at one end of the tubular part in a receiving groove by means of a screw connection, weighing at a distance from it at the other end the other movable wall by means of rivets, bolts or the like fixed bearing flanges is arranged. Within ainer to the sleeve isO connected to a movable wall a reaction disk is arranged, which via suitable intermediate members is also in the tubular part arranged control valve operated. In this known device, the formation of the tubular middle part is as well as the connection of the movable walls with this

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Middle part complicated and expensive. The object of the present invention is therefore to provide a improved servo motor unit with a simplified structure.

To solve the problem, the invention is therefore based on a fluid pressure servo motor with two movable ones Walls, which are combined into a structural unit by means of a tubular central part and at least in the area their radial outer sections with axially spaced apart diaphragms on the servomotor housing are connected, and consists according to the invention that the sleeve part extending between the movable walls is made in one piece with the one wall and with the end remote from this wall connected to the other wall by means of a screw thread in the area of a bore receiving a valve actuator / nmgskörper is, and that within the sleeve part a radially extending shoulder on which a reaction disk rests, is arranged, and that a through hole is through the shoulder extends through, into which an end portion of the in the area of the aforementioned bore in the central portion the second wall axially displaceably mounted Vanti1 actuating body into the coves of the reaction disk protrudes. In an expedient and further embodiment

the invention, the sleeve member having a sleeve-shaped portion in the region of the bore in the central portion of the second wall on the shoulder on which the disc rests Ie nude ions hinauserstreckt itself, us Λ f ül3 axial movement of the Yentilbetätigungskörpers begreif.

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The previously known complex connection of the partition walls with the sleeve-shaped middle part is achieved by the arrangement rermleden by means of a mounting groove with screw connection and riveted mounting flanges. Rather, the whole The construction of the servomotor and the joining of the partition walls to form a structural unit are significantly simplified, particular attention should be paid to the reduction in the number of individual parts. In addition, the arrangement of the with the valve actuating body cooperating sleeve-shaped Voraprungeβ on the end face of the sleeve part Possibility of direct mechanical power transmission from the valve actuation body to the partition walls or one of these actuatable power transmission rod.

In the following, the invention will be described in more detail with reference to a preferred embodiment shown in the accompanying drawings, but without this special execution form to be limited

Pig. Figure 1 shows a cross-section through the fluid pressure servofotor according to the invention, and

Tig. 2 shows a detail of an enlarged view of the rope in the one in Tig. 1 illustrated Servomotor arranged control valve unit.

The one in Tig. 1 fluid pressure servo motor 10 shown

contains a front shell section 12 and a rear shell section H assembled housing.

You can cut the housing by means of the steps described in section 12

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formed notches and the radially inwardly bent portions 16 of the shell portion 14 by turning the shell 12 to the locking of the lugs 18 behind aligned with the inwardly bent portion 16 and be connected to each other.

However, before assembling the housing by a annular membrane holder 24 and a spacer 26 provided with a toothed hand 26 movable

Walls 26 and 22 made of plastic in the section 14 of the Housing brewed in position. As can be seen from Fig. 1, the spacer 26 is between a

front membrane 30 and the membrane holder 24 arranged, which extend between the radially outwardly extending lugs 18 and a shoulder 32 of the front shell portion β 12 or the rear sole portion 14 and are pressed together by these.

The membrane holder 24 is formed with an axially extending body, the rearwardly extending projections 34 has, between which notches are provided to a number of contiguous and spaced apart to form arranged spring finger. The body of the bracket 24 is also provided with an edge opposite the rearwardly extending projections 34 which abut against a stepped shoulder 36 of the spacer 26 and overlay the outer edge of a rear membrane 38. The membrane has a thickened peripheral portion with a groove formed therein for receiving a lip 40 of the

Spacer 26, a leading edge of the radially

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thickened portions against the lower end of the stepped shoulder 36 and by the membrane holder 24 on the lip 40 is compressed. Such compression can easily be achieved by a bulged radial Projection in the area of the front edge on the thickened portion can be achieved immediately below the bracket 24, the one sliding over this bulged section Holder 24 is compressed until it rests against the stepped shoulder 36 of the spacer.

Both the front membrane 30 and the rear membrane 38, both of which have a thickened circumferential bead 41,

are also provided with central openings and beads 44 and 42, which extend around the openings and in the non-opened state have a smaller diameter than the grooves 48, 46 in the movable walls 20 and 22, respectively, which means that when the grooves are inserted into the Diaphragm openings formed an interference fit and the servomotor is divided into several chambers (chambers 50, 52). An inclined partition 54 extending inwardly from the spacer 26 further divides the servomotor into chambers 56 and 58 between the movable walls 20 and 22.

The movable walls 20 and 22 can be made of plastic, e.g. B. also consist of hard rubber and by means of a simple Screw thread 60 be connected so that they can move within the servo motor 10 together. The wall 20 is provided with an axial extension forming a fluid passage 62, the channel 62 in FIG the chamber 50 opens and also by means of a radial

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Channel 64 with the chamber 56 between the partition wall 54 and

the rear wall 22 in connection. In the axial channel 62, a force transmission rod 66 provided with a reaction plate 66 is provided. The reaction plate 68 is arranged to press a reaction disk 70 against a shoulder 72 in the region of the threaded end of the tubular extension surrounding the channel 62. The shoulder 72 has a central opening 74 into which the disc is pressed by the force exerted on the rod 66 force 70 _R in order to counteract the movement of the walls 20 and 22nd The opening 74 is dimensioned such that a force proportional to the force acting on the rod 66 is exerted for the valve actuation control rod 76 by means of a valve piston 78. The end 80 of the valve piston is slidably guided in the opening 74, and the valve piston 78 is acted upon by a return spring 82, which is supported between the tubular projection of the wall 22 and a radial flange 84 of the valve piston 78, the flange 84 on a Shoulder 86 of the movable wall 22 rests. This normally keeps the end 80 of the valve piston at a distance from the reaction disk 70. Behind the valve piston 78 and within the tubular portion 88 of the movable wall 22 which extends radially outwardly to the portion 14 of the servo motor 10,

a flexible plunger 90 is arranged, which is held by a sealing washer 92 on the tubular portion is. The sealing washer 92 is arranged to encompass the outer thickened portion 94 of the flexible plunger and presses against tubular portion 88. In addition, the flexible plunger 90 is provided with an annular washer

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disk 96 immediately behind a front of the plunger 90 provided, which is acted upon by a spring 98. The spring 98 extends between a flange 100 of the Control rod 76 and washer 96.

Between the tubular section surrounding the channel 62 of the movable wall 20 and the wall 54 or the tubular section Section 88 and the rear housing section U are ring seals 102 and 104. The push rod 66 is likewise mounted in the front section 12 of the servomotor housing by means of a seal 106 (not shown) and sealed · In addition, the movable walls 20 and 22 are within the chamber 50 by a conical spring 110 acted upon so that they have a bulged portion 108 on the back of the diaphragm 38 against a radially inner one Print portion of the rear shell 14 so that when the control rod 76 is released, the spring 110 the movable walls in ire in Fig. 1 shown back rest position.

In operation, through a check valve 112 in the front Section 12 of the servo motor housing is brought up to a vacuum from the intake port of the vehicle engine to the chamber 50 and passed through the channels 62, 64 to the chamber 56, from where it is passed through a sloping channel 114 in the movable Wall 22 to the valve cavity 116, which encloses the outside of the flexible plunger 90 essentially concentrically, is directed. According to the illustration in FIG. 1 comes across the piston 78 in the tripped position against the front of the flexible plunger 90 and holds the flexible plunger from that on the back of the shoulder 86 of the movable wall 22

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formed seat 122 remotely, so that the generated in the channel 114 Vacuum in this valve position around the valve piston and the tappet to a radial channel 124 is guided by the movable valve body leads to the chamber 52 of the servo motor 10. The vacuum present in the chamber 52 as a result then passes around the bulged stops 108 on the membranes 38 through the slots in the membrane holder to a space 126 and around the spacer 26 from there through a radial channel 128 into the chamber 58. When the For the purpose of operating the servo motor 10, a force is exerted on the control rod, the piston 78 moves afterwards at the front, so that its front end 80 comes to rest on the disc 70 and the flexible plunger 90 on the valve seat 122, whereby the piston 78 lifts from the front of the plunger 90, so that the flowing through the filter cartridges 130 Atmospheric pressure air into radial channel 124 to chamber 52 and through channels 126 and 128 into chamber 58 entry. As a result, the movable walls 20 and 22 are acted upon with different pressures, so that a Pressure difference acts, which counteracts the action of the spring 110 leads to a displacement of the walls 20, 22 in the direction of the front housing part 12, whereby a lifting movement of the Force transmission rod 66 takes place in the same direction.

If no vacuum is applied to the check valve 112 becomes, occurs after a certain movement has been covered mechanical connection between the radial flange 84 and an annular cap 132, so that a direct Transmission of power from rod 76 to walls 20 and 22 takes place, whereby they are moved and the power transmission

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Carry rod 66 with you to perform a lifting movement.

Ss it should be noted that the present invention in

Paths of the doctrine of invention can be modified in various ways and adapted to the respective needs

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Claims (2)

PAT BNTAN WALT HAlIBUBQ 30 ■ NKUIR Will 41 · FKHNHUF 36 74 28 U N D 38 41 19 THE BENDIX CORPORATION Planner building Detroit, Michigan (USA) December 3, 1965 Claims Fluid pressure servo motor with two movable walls, which by means of a tubular central part united to form a structural unit and at least in the area of their radial outer sections with in axial Diaphragms fixed at a distance from one another are connected to the servomotor housing, characterized in that the between the movable walls (20, 22) extending sleeve part (62) with the one wall (20) in one piece and with the end remote from this wall by means of a screw thread in the area of a bore (60) receiving a Y-valve actuating body (78) with the other wall (22) is connected, and that within the sleeve part (62) a radially extending shoulder (72), on which a reaction disk (70) rests, is arranged, and that a through hole (74) extends through the shoulder into which the end portion (80) of the valve actuating body mounted axially displaceably in the region of the bore (60) of the second wall (22) (78) protrudes up to the vicinity of the reaction disk. 2. Fluid pressure servo motor according to claim 1, characterized characterized in that the sleeve part (62) has a sleeve-shaped Section (132) which sioh in the area of Bore (60) in the second wall (22) extends beyond the shoulder (70) and the axial movement of the valve actuator (78) limited. 909834/0831 Blank page