Electric spool valve
AssigneeDenso Corporation
InventorsYasuhiro Hamaoka, Jiro Kondo
Life of this patent
Estimating the term…
Abstract
A sleeve has an input port, an output port, an insertion hole, and only one discharge port. A spool is axially slidable through the insertion hole to communicate among the input port, the output port, and the discharge port. An electric actuator is provided to one end of the sleeve and has a variable volume chamber, which communicates with the discharge port through an axial through hole and a spool breathing hole in the spool. The spool has a communication through hole to lead fluid from the output port to the discharge port through the axial through hole. A passage partition member is in the axial through hole to define an in-spool breathing passage communicating with the spool breathing hole.
Claims16
An electric spool valve comprising:
- a sleeve having an input port, an output port, and only one discharge port, the sleeve having an inner periphery defining an insertion hole;
- a spool axially slidable along the inner periphery of the sleeve to control communication among the input port, the output port, and the discharge port;
- and
- an electric actuator provided to one end of the sleeve to axially exert driving force to the spool,
- wherein the spool has an axial through hole, which axially extends through the spool,
- the spool has one end defining a spool breathing hole,
- the electric actuator has at least one variable volume chamber, which communicates with the discharge port of the sleeve through the axial through hole and the spool breathing hole of the spool, and
- the spool has a communication through hole configured to lead fluid from the output port of the sleeve to the discharge port of the sleeve through the axial through hole of the spool,
- the electric spool valve further comprising:
- a passage partition member provided in the axial through hole to partition the axial through hole and define an in-spool breathing passage, which communicates with the spool breathing hole.
An electric spool valve configured to be communicated with a releasing portion when being inserted to a stationary member, the electric spool valve comprising:
- a sleeve having an output port;
- a spool having an in-spool axial hole and being axially slidable in the sleeve to control communication between the in-spool axial hole and the output port;
- and
- an electric actuator provided to a rear end of the sleeve to axially exert driving force to the spool, the electric actuator having a variable volume chamber,
- wherein the sleeve has a front end portion, which is exposed to the releasing portion when being inserted to the stationary member, and
- the front end portion has a center portion and an outer circumferential periphery, which respectively have a front end center opening and a front end outer opening being independent from each other,
- the electric spool valve further comprising:
- a fluid discharging path configured to communicate with the front end center opening through the in-spool axial hole to lead fluid from the output port to the releasing portion;
- and
- an actuator breathing path communicating with the front end outer opening through an outer circumferential periphery of the sleeve and configured to communicate the variable volume chamber with the releasing portion,
- wherein the actuator breathing path is independent from the fluid discharging path.
An electric spool valve configured to be communicated with a releasing portion when being inserted to a stationary member, the electric spool valve comprising:
- a sleeve having an output port;
- a spool having an in-spool axial hole and being axially slidable in the sleeve to control communication between the in-spool axial hole and the output port;
- and
- an electric actuator provided to a rear end of the sleeve to axially exert driving force to the spool, the electric actuator having a variable volume chamber,
- wherein the sleeve has a front end portion, which is exposed to the fluid releasing portion when being inserted to the stationary member, and
- the front end portion has a center portion and an outer circumferential periphery, which respectively have a front end center opening and a front end outer opening being independent from each other,
- the electric spool valve further comprising:
- a partition member provided in the in-spool axial hole to partition the in-spool axial hole into a first space, which communicates with the front end outer opening, and a second space, which communicates with the front end center opening;
- a fluid discharging path communicating with the front end outer opening through the first space to lead fluid from the output port to the fluid releasing portion;
- and
- an actuator breathing path communicating with the front end center opening through the second space and configured to communicate the variable volume chamber with the fluid releasing portion,
- wherein the actuator breathing path is independent from the fluid discharging path.
Dependencies are inferred from the claim text.