Vacuum and electric cruise control actuator

• US 4,756,234 A
• Filed: 10/02/1987
• Issued: 07/12/1988
• Est. Priority Date: 10/02/1985
• Status: Expired due to Term

• Current Assignee: Eaton Corp. (Wisconsin) (Eaton Corporation PLC.)
• Original Assignee: Eaton Corp. (Wisconsin) (Eaton Corporation PLC.)
• Inventors: Anderson, Patrick J.
• Primary Examiner(s): Hart, Douglas
• Application Number:
  US07/105,150
• Time in Patent Office: 284 Days
• Field of Search: 91/449, 91/456, 91/459, 91/454, 123/352, 123/353, 180/179, 180/178
• US Class Current: 91/454
• CPC Class Codes: B60K 31/102 where at least one electrical quantity is set by the vehicle operator

Abstract

A speed control actuator includes a diaphragm forming a movable wall of a variable pressure chamber. An output member is fixed to the diaphragm to impart diaphragm movement to a throttle valve of the automotive vehicle. Three solenoid valves are mounted on a common bracket and are disposed in the variable pressure chamber for controlling vacuum and atmospheric pressure into the chamber. Two of the three solenoid valves are normally biased open to assure disengagement of the actuator.

Claims

1. A differential pressure servomotor of the type employed in a speed control system on a vehicle comprising:

a housing having a first generally fixed wall portion and a second generally flexible wall portion, said walls forming a variable pressure chamber therebetween;

said housing fixed wall portion defining a first port adapted for connection in said chamber with a source of vacuum and a first solenoid having an armature movably received in said solenoid with a poppet valve member provided on one end of said armature and aligned with said first port for selectively opening and closing said first port for communicating vacuum pressure to said variable pressure chamber;

said housing fixed wall portion defining a second port in said chamber adapted for communicating with atmospheric pressure and a second solenoid having an armature movably received in said second solenoid with a poppet valve member provided on one end of said armature and aligned with said second port in the direction of motion of said armature opening and closing said second port for communicating atmospheric pressure to said variable pressure chamber;

said housing fixed wall portion defining a third port in said chamber adapted to supplied with atmospheric pressure and a third normally open solenoid having a valve member pivoted about a point adjacent said third solenoid for selectively opening and closing said third port for communicating atmospheric pressure to said variable pressure chamber independently of said second port;

a recess in a generally flat surface of said first wall portion said recess receiving said first, second, and third valves in said variable pressure chamber; and

,

a bracket receiving said first, second, and third valves whereby said valves may be pre-assembled on said bracket before placement in said recess to facilitate manufacture of said servomotor.

2. The servomotor as defined in claim 1, wherein said third valve includes an elongated member mounted for rotational movement about a pivot with, one end of said elongated member adapted for sealing engagement with said port.

3. The servomotor as defined in claim 1, wherein said third valve includes a biasing means and said bracket further includes means for anchoring one end of said third biasing means.

4. The servomotor as defined in claim 1, wherein said bracket further includes means for pivoting said third valve along an intermediate portion of said third valve.

5. The servomotor defined in claim 1, wherein said first, second and third solenoids are aligned on said bracket.