A parking brake system for a work vehicle may include an internal braking mechanism and an external brake actuator. The brake actuator may generally include a housing at least partially defining a rod-side chamber, a secondary chamber and a piston-side chamber extending between the rod-side and seco
A parking brake system for a work vehicle may include an internal braking mechanism and an external brake actuator. The brake actuator may generally include a housing at least partially defining a rod-side chamber, a secondary chamber and a piston-side chamber extending between the rod-side and secondary chambers. The brake actuator may also include a primary piston movable between a first position at which the braking mechanism is actuated to an engaged state and a second position at which the braking mechanism is actuated to a disengaged state. In addition, the brake actuator may include a secondary piston at least partially housed within the secondary chamber that is configured to apply a force against the primary piston when fluid is supplied within the secondary chamber in order to move the primary piston from the first position to the second position.
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1. A parking brake system for use with a transmission of a work vehicle, the parking brake system comprising: a braking mechanism housed within the transmission; anda brake actuator positioned outside the transmission, the brake actuator being coupled to the braking mechanism to allow the braking me
1. A parking brake system for use with a transmission of a work vehicle, the parking brake system comprising: a braking mechanism housed within the transmission; anda brake actuator positioned outside the transmission, the brake actuator being coupled to the braking mechanism to allow the braking mechanism to be actuated between an engaged state and a disengaged state, the brake actuator comprising:a housing extending between a first end and a second end, the housing at least partially defining a rod-side chamber, a secondary chamber and a piston-side chamber extending between the rod-side and secondary chambers;a primary piston positioned within the housing between the piston-side and rod-side chambers, the primary piston movable between a first position at which the braking mechanism is actuated to the engaged state and a second position at which the braking mechanism is actuated to the disengaged state;a rod extending partially within the rod-side chamber and including an internal end coupled to the primary piston and an external end positioned outside the housing;a spring housed within the rod-side chamber so as to be engaged between the primary piston and the first end of the housing; anda secondary piston at least partially housed within the secondary chamber, the secondary piston extending between a proximal end positioned at or adjacent to the primary piston and a distal end positioned opposite the proximal end, the secondary piston being configured to apply a force against the primary piston when fluid is supplied within the secondary chamber at the distal end of the secondary piston in order to move the primary piston from the first position to the second position. 2. The parking brake system of claim 1, wherein the brake actuator is operable in both a first operating mode, within which the primary piston is configured to be moved from the first position to the second position by supplying fluid within the piston-side chamber in order to push the primary piston in the direction of the first end of the housing, and a second operating mode, within which the primary piston is configured to be moved from the first position to the second position by supplying fluid into the secondary chamber at the distal end of the secondary piston such that the proximal end of the secondary piston contacts against the primary piston in order to push the primary piston in the direction of the first end of the housing. 3. The parking brake system of claim 1, wherein the brake actuator further comprises a supply port for supplying fluid within the housing and a return port for expelling fluid from the housing. 4. The parking brake system of claim 3, wherein the brake actuator further comprises a valve in flow communication with the supply and return ports, the valve being configured to regulate the fluid supplied to and expelled from the piston-side chamber by selectively coupling the piston side chamber to either the supply port or the return port. 5. The parking brake system of claim 3, wherein the brake actuator further comprises a secondary port in fluid communication with the secondary chamber. 6. The parking brake system of claim 5, wherein the supply and return ports are fluidly connected to a first fluid source and the secondary port is configured to be fluidly connected to a separate, second fluid source. 7. The parking brake system of claim 1, wherein the brake actuator further comprises a return port for expelling fluid from the housing and a fluid vent in flow communication between the rod-side chamber and the return port, wherein fluid contained within the rod-side chamber is evacuated therefrom via the fluid vent and is expelled from the brake actuator through the return port. 8. The parking brake system of claim 7, wherein the return port is also in flow communication with the piston-side chamber such that fluid contained in both the piston-side chamber and the rod-side chamber is expelled from the brake actuator through the return port. 9. The parking brake system of claim 1, wherein the brake actuator is pivotally coupled to the transmission such that the brake actuator pivots about a fixed pivot point when the braking mechanism is actuated between the engaged and disengaged states. 10. A parking brake system for use with a transmission of a work vehicle, the parking brake system comprising: a braking mechanism housed within the transmission; anda brake actuator positioned outside the transmission, the brake actuator being coupled to the braking mechanism to allow the braking mechanism to be actuated between an engaged state and a disengaged state, the brake actuator comprising:a housing extending between a first end and a second end, the housing at least partially defining a rod-side chamber and a piston-side chamber;a primary piston positioned within the housing between the piston-side and rod-side chambers, the primary piston movable between a first position at which the braking mechanism is actuated to the engaged state and a second position at which the braking mechanism is actuated to the disengaged state;a rod extending partially within the rod-side chamber and including an internal end coupled to the primary piston and an external end positioned outside the housing;a spring housed within the rod-side chamber so as to be engaged between the primary piston and the first end of the housing;a return port defined within or extending from the housing; anda fluid vent in flow communication between the rod-side chamber and the return port, wherein any fluid contained within the rod-side chamber is evacuated therefrom via the fluid vent and is subsequently expelled from the brake actuator through the return port. 11. The parking brake system of claim 10, wherein the return port is also in flow communication with the piston-side chamber such that fluid contained in both the piston-side chamber and the rod-side chamber is expelled from the brake actuator through the return port. 12. The parking brake system of claim 10, wherein the housing further defines a secondary chamber extending between the piston-side chamber and the second end of the housing and wherein the brake actuator further comprises a secondary piston at least partially housed within the secondary chamber. 13. The parking brake system of claim 12, wherein the secondary piston extends between a proximal end positioned at or adjacent to the primary piston and a distal end positioned opposite the proximal end, the secondary piston being configured to apply a force against the primary piston when fluid is supplied within the secondary chamber at the distal end of the secondary piston in order to move the primary piston from the first position to the second position. 14. The parking brake system of claim 13, wherein the brake actuator is operable in both a first operating mode, within which the primary piston is configured to be moved from the first position to the second position by supplying fluid within the piston-side chamber in order to push the primary piston in the direction of the first end of the housing, and a second operating mode, within which the primary piston is configured to be moved from the first position to the second position by supplying fluid into the secondary chamber at the distal end of the secondary piston such that the proximal end of the secondary piston contacts against the primary piston in order to push the primary piston in the direction of the first end of the housing. 15. The parking brake system of claim 12, wherein the brake actuator further comprises a supply port defined within or extending from the housing and a valve in flow communication with the supply and return ports, the valve being configured to regulate the fluid supplied to and expelled from the piston-side chamber by selectively coupling the piston side chamber to either the supply port or the return port. 16. The parking brake system of claim 15, wherein the brake actuator further comprises a secondary port defined within or extending from the housing, the secondary port being in fluid communication with the secondary chamber. 17. The parking brake system of claim 16, wherein the supply and return ports are fluidly connected to a first fluid source and the secondary port is configured to be fluidly connected to a separate, second fluid source. 18. The parking brake system of claim 10, wherein the brake actuator is pivotally coupled to the transmission such that the brake actuator pivots about a fixed pivot point when the braking mechanism is actuated between the engaged and disengaged states.
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이 특허에 인용된 특허 (21)
Rühringer, Uwe; Schmid, Wolfgang; Schmidt, Thilo, Actuator device for actuating a locking mechanism.
Johnson Phillip R. (Decatur IL) Prillinger Peter F. M. (Peoria Heights IL) Sieving Alfred W. (Decatur IL), Control system for an integral spring-loaded parking and service brake.
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