Simplified cooling circuit for powertrain braking system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F16D-065/833
F16D-065/853
F16D-069/00
F16D-121/02
출원번호
US-0476661
(2009-06-02)
등록번호
US-8887880
(2014-11-18)
발명자
/ 주소
Cliff, Michael J.
Wood, Jr., Robert L.
Eastman, Briton T.
Ganapathi, Poongundran
출원인 / 주소
Deere & Company
대리인 / 주소
Quarles & Brady LLP
인용정보
피인용 횟수 :
0인용 특허 :
3
초록▼
An efficient lubrication system for wet plate brake assemblies includes a flow control system that passes lubricant for cooling and lubrication through interdigitated wet brake plates when the plates are engaged. When the plates are disengaged, the wet plate assembly is controlled to limit its displ
An efficient lubrication system for wet plate brake assemblies includes a flow control system that passes lubricant for cooling and lubrication through interdigitated wet brake plates when the plates are engaged. When the plates are disengaged, the wet plate assembly is controlled to limit its displacement by means of a pin and spring such that a gap is provided around the brake plates to provide a preferential path for lubricant, thus minimizing parasitic losses.
대표청구항▼
1. A powertrain assembly including an integral brake assembly, said powertrain assembly comprising: a housing defining a brake chamber having a first port and a second port;a torque carrying power shaft;a brake assembly disposed in said brake chamber and having interdigitated annular friction plates
1. A powertrain assembly including an integral brake assembly, said powertrain assembly comprising: a housing defining a brake chamber having a first port and a second port;a torque carrying power shaft;a brake assembly disposed in said brake chamber and having interdigitated annular friction plates, including an end plate, said friction plates respectively connected to said housing and to said torque carrying power shaft; anda liquid lubricant and cooling circuit for providing liquid flow from said first port into said brake chamber, wherein, in an engaged position of said brake assembly, said second port is closed by said end plate to prevent flow of said liquid through said second port and said liquid flows through said first port into said brake chamber and between said friction plates, and wherein, in a disengaged position of said brake assembly, said second port is open to said first port such that at least some of said liquid flows through said first port into said brake chamber, between said housing and said friction plates, and through said second port out of said brake chamber without passing between said fiction plates themselves so as to reduce parasitic losses when said brake assembly is not engaged. 2. The powertrain assembly as claimed in claim 1, wherein said friction plates have an outside diameter and an inside diameter and the flow of said liquid between said friction plates is from the outside diameter to the inside diameter. 3. The powertrain assembly as claimed in claim 1, wherein in said disengaged position of said brake assembly said end plate is spaced from said housing to provide clearance between said end plate and said housing for passage of said liquid into said second port. 4. The powertrain assembly as claimed in claim 3, wherein said end plate is spaced from said housing by at least approximately 1 mm when said brake assembly is in said disengaged position. 5. The powertrain assembly as claimed in claim 1, wherein said housing has an end wall and said brake assembly includes an annular pusher element acting against said friction plates and urging them against said end wall of said housing to provide a retarding force during engagement of said brake assembly. 6. The powertrain assembly as claimed in claim 5, wherein said housing has an annular shoulder cooperating with a shoulder on said annular pusher element and pressurized therebetween to displace said pusher element against said friction plates to provide a retarding force during engagement of said brake assembly. 7. The powertrain assembly as claimed in claim 6, further comprising an element having an expansion spring to displace said friction plates during disengagement of said brake assembly. 8. The powertrain assembly as claimed in claim 7, wherein said element has a second spring with a spring force greater than a spring force of the expansion spring to maintain a clearance between said friction plates and said housing. 9. The powertrain assembly as claimed in claim 8, wherein said element includes a rod extending through an opening in each of said friction plates located between inside and outside diameters of the associated friction plate, said element having a length for abutting said housing to maintain said clearance between said friction plates and said housing. 10. A work machine, comprising: a frame;a prime mover mounted to said frame; anda powertrain mounted to said frame and driven by said prime mover, said powertrain including: a housing defining a brake chamber having a first port, configured as a first opening in a first wall of the housing, and a second port, configured as a second opening in a second wall of the housing;a torque-carrying power shaft;a brake assembly disposed in said brake chamber and having interdigitated annular friction plates respectively connected to said housing and to said torque-carrying power shaft; anda liquid lubricant and cooling circuit for providing liquid flow from said first port into said brake chamber, wherein, in a disengaged position of said brake assembly, a continuous liquid flow path is provided from said first port to said second port, via a clearance between said housing and said friction plates, such that at least some of said liquid flows through said first port into said brake chamber, between said housing and said friction plates, and through said second port out of said brake chamber without passing between said fiction plates themselves so as to reduce parasitic losses when said friction plates are not engaged, and wherein, in an engaged position of said brake assembly, said continuous liquid flow path between said first port and said second port is closed and said liquid flows through said first port into said brake chamber, and between said friction plates. 11. The work machine as claimed in claim 10, wherein said friction plates have an outside diameter and an inside diameter and the flow of said liquid between said friction plates is from the outside diameter to the inside diameter. 12. The work machine as claimed in claim 10, wherein in said disengaged position of said brake assembly said friction plates are spaced from said housing to provide said clearance between said housing and an endmost one of said friction plates for passage of said liquid through said clearance and through said second port out of said brake chamber. 13. The work machine as claimed in claim 12, wherein in said disengaged position of said brake assembly said friction plates are spaced from said housing and said friction plates are displaced relative to one another. 14. The work machine as claimed in claim 13, wherein said endmost one of said friction plates is spaced from said housing by at least approximately 1 mm when said brake assembly is in said disengaged position. 15. The work machine as claimed in claim 10, wherein said brake assembly includes an annular pusher element having one end pushing against said friction plates to urge them against a wall of said housing during engagement of said brake assembly. 16. The work machine of claim 10, wherein said housing has a shoulder cooperating with a shoulder on said pusher element and adapted to be pressurized to displace said pusher element against said friction plates to urge said friction plates against one another to brake said torque-carrying shaft during engagement of said brake assembly. 17. The work machine as claimed in claim 15, further comprising a spring-loaded element having a first spring to displace said friction plates during disengagement of said brake assembly. 18. The work machine as claimed in claim 17, wherein said spring-loaded element includes a second spring having a spring force greater than a spring force of said first spring to maintain said clearance between at least one end plate of said friction plates and said housing for passage of said liquid during disengagement of said brake assembly. 19. The work machine of claim 18, wherein said spring-loaded element includes a rod extending through an opening in each of said friction plates located between inside and outside diameters of the associated friction plate, said spring-loaded element having a length for setting said clearance between said end plates of said friction plates and said housing. 20. A powertrain assembly including an integral brake assembly, said powertrain assembly comprising: a housing defining a brake chamber, said housing including an inlet port for liquid flow into the brake chamber and an outlet port for liquid flow out of the brake chamber;a torque carrying power shaft;a brake assembly disposed in said brake chamber and having interdigitated annular friction plates respectively connected to said housing and to said torque carrying power shaft, each of said friction plates including an outer diameter and an inner diameter defining an annular portion of each of said friction plates;a brake assembly disposed in said brake chamber, said brake assembly including a pusher plate and interdigitated annular friction plates respectively connected to said housing and to said torque-carrying power shaft;a rod having a first portion and a second portion separated by a shoulder, said first portion of said rod extending through said annular portions of said friction plates, said second portion of said rod extending into a bore in the housing, and said shoulder engaging an end plate of said friction plates;a first spring seated on said first portion of said rod, said first spring engaging a plurality of said friction plates to urge said plurality of friction plates to expand relative to each other;a second spring seated on said second portion of said rod, said second spring urging said rod out of said bore; anda liquid lubricant and cooling circuit for providing a flow of liquid through said inlet port into said brake chamber;wherein, in a disengaged position of said brake assembly, said first spring expands said friction plates relative to each other and said second spring, via said shoulder, maintains a clearance between said end plate and said outlet port, a continuous liquid flow path being thereby provided from said inlet port, through said clearance, to said outlet port, whereby at least some of said liquid flows through said inlet port into said brake chamber and along said continuous liquid flow path from said inlet port, through said clearance, and through said outlet port out of said brake chamber; andwherein, in an engaged position of said brake assembly, said pusher plate urges said friction plates together, said end plate thereby compressing said first spring, via said shoulder, such that said clearance and said continuous liquid flow path between said inlet port and said outlet port are closed.
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