Servo actuators
First Claim
1. A servo actuator comprising:
- an actuator housing;
an actuator member located at least partially within the actuator housing;
at least one spool located in a cavity formed within the actuator housing;
a first set of internal ports formed within the actuator housing, the first set of internal ports including a first inlet port, a first outlet port and a first pair of control ports, the first inlet port being arranged for connection to a first pressurised supply;
a second set of internal ports formed within the actuator housing, the second set of ports comprising a second inlet port, a second outlet port and a second pair of control ports, the second inlet port being arranged for connection to a second pressurised supply;
wherein the actuator housing includes a center gland, and the first set of internal ports and second set of internal ports are formed in the center gland; and
wherein, in use, movement of the at least one spool alters a flow path of fluid through the first and second set of internal ports to control the movement of the actuator member.
1 Assignment
0 Petitions
Accused Products
Abstract
A servo actuator (1) comprises an actuator housing (4); an actuator member (2) located within the actuator housing (4) and at least one spool (8) located in a cavity (6) formed within the actuator housing (4). The housing (4) also comprises a first set of internal ports including an inlet port (P), an outlet port (T) and a pair of control ports (SI, S2), the inlet port (P) being arranged for connection to a first pressurised supply and a second set of internal ports comprising an inlet port (P′), an outlet port (T′) and a pair of control ports (SI′, S2′), the inlet port (P′) being arranged for connection to a second pressurised supply. In use, movement of the spool (8) alters the flow path of fluid through the first and second set of internal ports to control the movement of the actuator member (2).
11 Citations
15 Claims
-
1. A servo actuator comprising:
-
an actuator housing; an actuator member located at least partially within the actuator housing; at least one spool located in a cavity formed within the actuator housing; a first set of internal ports formed within the actuator housing, the first set of internal ports including a first inlet port, a first outlet port and a first pair of control ports, the first inlet port being arranged for connection to a first pressurised supply; a second set of internal ports formed within the actuator housing, the second set of ports comprising a second inlet port, a second outlet port and a second pair of control ports, the second inlet port being arranged for connection to a second pressurised supply; wherein the actuator housing includes a center gland, and the first set of internal ports and second set of internal ports are formed in the center gland; and wherein, in use, movement of the at least one spool alters a flow path of fluid through the first and second set of internal ports to control the movement of the actuator member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method of controlling the motion of an actuator member of a servo actuator, the servo actuator comprising:
-
an actuator housing, in which a portion of the actuator member is housed; at least one spool located in a cavity formed within the actuator housing; a first set of internal ports formed within the actuator housing, the first set of internal ports including a first inlet port, a first outlet port and a first pair of control ports; and a second set of internal ports formed within the actuator housing, the second set of ports comprising a second inlet port, a second outlet port and a second pair of control ports; and wherein the actuator housing includes a center gland, and the first set of internal ports and second set of internal ports are formed in the center gland; the method comprising the steps of; connecting the first inlet port to a first pressurised supply; connecting the second inlet port to a second pressurised supply; and moving the at least one spool to alter a flow path of (i) fluid from the first pressurised supply through the first set of internal ports and (ii) fluid from the second pressurised supply through the second set of internal ports to control the movement of the actuator member. - View Dependent Claims (14)
-
-
15. A servo actuator comprising:
-
an actuator housing; an actuator member located at least partially within the actuator housing; at least one spool located in a cavity formed within the actuator housing; a first set of internal ports formed within the actuator housing, the first set of internal ports including a first inlet port, a first outlet port and a first pair of control ports, the first inlet port being arranged for connection to a first pressurised supply; a second set of internal ports formed within the actuator housing, the second set of ports comprising a second inlet port, a second outlet port and a second pair of control ports, the second inlet port being arranged for connection to a second pressurised supply; at least one inner sleeve located in the cavity such that the outer surface of the spool is adjacent to the inner surface of the inner sleeve; at least one outer sleeve located in the cavity such that the outer surface of the outer sleeve is adjacent to the inner surface of the actuator housing which defines the cavity, each of the at least one inner sleeve and the at least one outer sleeve being mounted for movement relative to the actuator housing; a locking member biased towards a locked position in which the member prevents the inner sleeve moving relative to the outer sleeve; a mechanical linkage arranged to move the at least one outer sleeve in response to a movement of the actuator member; and wherein, in use, movement of the at least one spool alters a flow path of fluid through the first and second set of internal ports to control the movement of the actuator member.
-
Specification