Power take-off (PTO) assembly with a disconnect clutch
Systems and methods for a power take-off (PTO) assembly. The PTO assembly, in one example, includes a bi-directional pump in fluidic communication with a fluid reservoir and a hydraulic system and a disconnect clutch configured to mechanically disengage and disconnect the bi-directional pump from a transmission when a prime mover is in operation, and mechanically engage and connect the bi-directional pump to the transmission when the prime mover is shut down. The PTO assembly further includes an electro-mechanical valve configured to trigger engagement and disengagement of the disconnect clutch.
1. A vehicle transmission system, comprising:
a power take-off (PTO) including:
a bi-directional pump in fluidic communication with a hydraulic system;
a disconnect clutch configured to:
selectively mechanically connect and disconnect the bi-directional pump based on an operational state of a prime mover; and
an valve configured to trigger engagement and disengagement of the disconnect clutch.
2. The vehicle transmission system of claim 1 , wherein selectively mechanically connecting and disconnecting the bi-directional pump includes:
mechanically disconnecting the bi-directional pump from the hydraulic system when the prime mover is in operation.
3. The vehicle transmission system of claim 1 , wherein selectively mechanically connecting and disconnecting the bi-directional pump includes:
mechanically connecting the bi-directional pump to the hydraulic system when the prime mover is shut down.
4. The vehicle transmission system of claim 1 , wherein the hydraulic system is configured to hydraulically actuate multiple clutches.
5. The vehicle transmission system of claim 1 , wherein the hydraulic system is configured to supply hydraulic fluid to one or more hydraulic devices.
6. The vehicle transmission system of claim 5 , wherein the one or more hydraulic devices include a hydraulic steering component.
7. The vehicle transmission system of claim 1 , wherein the prime mover is an internal combustion engine or a traction motor.
8. The vehicle transmission system of claim 1 , further comprising a transmission output shaft rotationally coupled to the PTO.
9. The vehicle transmission system of claim 1 , wherein the disconnect clutch is a dog clutch.
10. The vehicle transmission system of claim 1 , wherein the bi-directional pump includes multiple check valves that are configured to provide fluid to the hydraulic system when the bi-directional pump is rotated in a clockwise direction and a counterclockwise direction.
11. A method for operation of a transmission system, comprising:
selectively mechanically connecting and disconnecting a bi-directional pump based on an operational state of a prime mover via operation of a disconnect clutch;
wherein the transmission system includes:
a power take-off (PTO) including:
the bi-directional pump in fluidic communication with a hydraulic system;
the disconnect clutch; and
an valve configured to trigger engagement and disengagement of the disconnect clutch.
12. The method of claim 11 , wherein selectively mechanically connecting and disconnecting the bi-directional pump includes:
mechanically disconnecting the bi-directional pump from the hydraulic system when the prime mover is in operation.
13. The method of claim 11 , wherein selectively mechanically connecting and disconnecting the bi-directional pump includes:
mechanically connecting the bi-directional pump to the hydraulic system when the prime mover is shut down.
14. The method of claim 11 , wherein the valve is an electro-mechanical valve.
15. The method of claim 11 , wherein a working fluid of the bi-directional pump is oil.
16. A system, comprising:
a power take-off including:
a bi-directional pump in fluidic communication with a hydraulic system;
a clutch that mechanically connects and disconnects a multi-speed transmission from the bi-directional pump; and
a solenoid valve that permits and inhibits fluid flow to an actuator of the clutch; and
a controller configured to:
energize the solenoid valve to permit fluid flow to the actuator to disengage the clutch.
17. The system of claim 16 , wherein, when the solenoid valve is de-energized during shutdown of a prime mover, fluid flow to the actuator is inhibited and the actuator engages the clutch.
18. The system of claim 17 , wherein the prime mover is an internal combustion engine.
19. The system of claim 16 , wherein the clutch includes multiple toothed faces.
20. The system of claim 16 , wherein the bi-directional pump is in fluidic communication with an oil sump.