Servomotor having a one-piece center plate

Claim 2

A fluid pressure servomotor, comprising: a housing having first and second portions, said first and second portions having first and second annular flanges, respectively; partition means rigidly fIxed between and in engagement with said first and second annular flanges for separating said first and second portions; movable wall means operatively arranged in said housing defining first and second variable volume chambers, said movable wall means including: a hub having passages interconnecting said first and second variable volume chambers, diaphragm means for dividing each of said first and second variable chambers into at least two portions and support means for retaining said diaphragm means on said hub; valve means carried by said hub, said valve means being operatively connected to said passages in said hub; operator-operated means for actuating said valve means, said valve means moving in response to said operator-operated means for creating a pressure differential across said movable wall means; and force-transmitting means responsive to said movable wall.

Claim 3

The servomotor, as recited in claim 1, wherein said first and second annular flanges face each other with one being substantially perpendicular with respect to the other.

Claim 4

The servomotor, as recited in claim 1, wherein said partition means includes; first and second shoulders against which said diaphragm means are held by said first and second portions to establish a fluid seal therebetween.

Claim 5

The servomotor, as recited in claim 1, wherein said first and second annular flanges face each other with one being substantially perpendicular with respect to the other.

Claim 6

The servomotor, as recited in claim 1, wherein said partition means includes; first and second shoulders against which said diaphragm means are held by said first and second portions to establish a fluid seal therebetween.

Claim 7

In a servomotor of a power braking system, means for dividing the servomotor into a pair of opposing variable volume chambers, said means comprising: a first shell having a central opening with a shoulder on an opened end; a second shell having a central opening with an opened end having a flange which fits against said shoulder when joined to said first shell; a hub member slidably retained in said second shell having first and second internal passages; valve means connected to said hub member for supplying atmospheric pressure to said first internal passage; first movable wall means attached to the front end of said hub member having a first bead located adjacent said shoulder of said first shell; second movable wall means attached to the rear end of said hub member having a second bead concentric with said flange of said second shell; and partition means having one end slidably secured to said hub and the other end compressing said first and second beads into sealing engagements upon joining said second shell with said first shell, said partition means permitting atmospheric pressure to be communicated through said first internal passage to the same side of said first and second movable wall means and a different pressure through said second internal passage to the other side of said first and second movable wall means to create a pressure differential causing said hub means to move in response to an operation of said valve means by an operator.

Claim 8

In a servomotor of a power braking system, means for dividing the servomotor into a pair of opposing variable volume chambers, said means comprising: a first shell having a central opening with a shoulder on an opened end; a second shell having a central opening with an opened end having a flange which fits against said shoulder when joined to said first shell; a hub member slidably retained in said second shell having first and second internal passages; valve means connected to said hub member for supplying atmospheric pressure to said first internal passage; first movable wall means attached to the front end of said hub member having a first bead located adjacent said shoulder of said first shell; second movable wall means attached to the rear end of said hub member having a second bead concentric with said flange of said second shell; and partition means having one end slidably secured to said hub and the other end compressing said first and second beads into sealing engagements upon joining said second shell with said first shell, said partition means permitting atmospheric pressure to be communicated through said first internal passage to the same side of said first and second movable wall means and a different pressure through said second internal passage to the other side of said first and second movable wall means to create a pressure differential causing said hub means to move in response to an operation of said valve means by an operator.

Claim 9

The servomotor, as recited in claim 4, wherein said first and second shell are joined together by twist lock means to maintain a fluidtight seal between said partition means, first and second beads and the first and second shells.

Claim 10

The servomotor, as recited in claim 5, wherein said other end of said partition means includes: a radial portion which holds said first bead in sealing abutment with said first shell; and an axially extending support integral with said radial portion for biasing said second bead into sealing engagement with said second shell.

Claim 11

The servomotor, as recited in claim 4, including: means located on said front and rear shell engageable with said partition means for positively locating said first and second beads upon joining said second shell to said first shell.