A brake assembly for a mobile machine is disclosed. The brake assembly may have a stationary housing forming a coolant inlet and a coolant outlet, a rotatable member, and a disc stack disposed within a cavity at least partially formed by the stationary housing and the rotatable member. The disc stac
A brake assembly for a mobile machine is disclosed. The brake assembly may have a stationary housing forming a coolant inlet and a coolant outlet, a rotatable member, and a disc stack disposed within a cavity at least partially formed by the stationary housing and the rotatable member. The disc stack may have a plurality of friction plates operatively coupled to the rotatable member and a plurality of separator plates interleaved with the plurality of friction plates and operatively coupled to the stationary housing. The brake assembly may also have a piston disposed within the cavity and configured to compress the disc stack, and a seal located at an axial interface between the stationary housing and the rotatable member and downstream of the disc stack relative a flow of coolant from the coolant inlet to the coolant outlet.
대표청구항▼
1. A brake assembly, comprising: a stationary housing forming a coolant inlet and a coolant outlet;a rotatable member;a disc stack disposed within a cavity at least partially formed by the stationary housing and the rotatable member, the disc stack having a plurality of friction plates operatively c
1. A brake assembly, comprising: a stationary housing forming a coolant inlet and a coolant outlet;a rotatable member;a disc stack disposed within a cavity at least partially formed by the stationary housing and the rotatable member, the disc stack having a plurality of friction plates operatively coupled to the rotatable member and a plurality of separator plates interleaved with the plurality of friction plates and operatively coupled to the stationary housing;a piston disposed within the cavity and configured to compress the disc stack;a seal located at an axial interface between the stationary housing and the rotatable member and downstream of the disc stack relative a flow of coolant from the coolant inlet to the coolant outlet;a first axial passage formed in the disc stack and directly fluidly connected to the coolant inlet such that coolant flows axially from the coolant inlet into the first axial passage; anda second axial passage formed in the disc stack between a spline and the disk stack and fluidly connected to the coolant outlet,wherein the second axial passage includes a first end located at a first end of the spline and fluidly connected to an area around the seal and a second end located at a second end of the spline and fluidly connected to the coolant outlet by an annular gap, andwherein the area around the seal is enclosed except for a fluid connection with the first end of the second axial passage. 2. The brake assembly of claim 1, wherein the coolant outlet is located radially inward of the coolant inlet. 3. The brake assembly of claim 1, wherein: each of the plurality of friction plates is generally ring-like and includes a first plurality of teeth extending radially inward to engage a second plurality of teeth extending radially outward from the rotatable member such that spaces between adjacent teeth of the first plurality of teeth are substantially filled with teeth from the second plurality of teeth;each of the plurality of separator plates is generally ring-like and includes a third plurality of teeth extending radially-outward to engage a fourth plurality of teeth extending radially inward from the stationary housing such that spaces between adjacent teeth of the third plurality of teeth are substantially filled with teeth from the fourth plurality of teeth;at least one tooth of the third plurality of teeth is missing such that the first axial passage is formed at a location of the missing at least one tooth of the third plurality of teeth; andat least one tooth of the first plurality of teeth is missing such that the second axial passage is formed at a location of the missing at least one tooth of the first plurality of teeth. 4. The brake assembly of claim 3, wherein the first axial passage is in direct fluid communication with the coolant inlet and a cross-sectional area of the first axial passage is smaller than a cross-sectional area of the coolant inlet. 5. The brake assembly of claim 3, wherein the second axial passage is in direct fluid communication with the coolant outlet and the second axial passage is located radially outward from an entrance into the coolant outlet formed by a passage formed in a park brake housing. 6. The brake assembly of claim 3, wherein: the first axial passage includes more than one axial passage; andthe second axial passage includes more than one axial passage. 7. The brake assembly of claim 3, wherein the first axial passage includes a plurality of equally spaced axial passages. 8. The brake assembly of claim 3, wherein the first axial passage includes a plurality of axial passages arranged in equally spaced groupings of passages. 9. The brake assembly of claim 1, further including an end plate connected to the housing and disposed at an end of the disc stack opposite the piston, at least one of the housing and the end plate having an annular groove in fluid communication with the first axial passage and configured to distribute coolant annularly around the disc stack. 10. The brake assembly of claim 3, wherein: the second plurality of teeth form a spline extending axially from the rotatable member toward the stationary housing;the piston is generally ring-like and includes an inner annular surface; andan annular gap exists between an outer annular surface of the spline and the inner annular surface of the piston. 11. The brake assembly of claim 10, wherein the gap has a radial dimension of at least 1 mm. 12. The brake assembly of claim 10, wherein a distal end surface of the spline terminates at about an axial midpoint of the inner annular surface. 13. The brake assembly of claim 10, wherein the piston includes a segmented outer annular surface having an outer diameter about equal to an outer diameter of the plurality of friction plates. 14. The brake assembly of claim 1, wherein at least a first portion of the coolant outlet has a machined annular surface and at least a second portion of the coolant outlet has a cast surface. 15. The brake assembly of claim 14, wherein an axial entry portion of the coolant outlet has a machined annular surface. 16. The brake assembly of claim 15, further including a park brake housing connected to the stationary housing and having a machined axial passage in general alignment with the axial entry portion of the coolant outlet. 17. The brake assembly of claim 1, wherein the seal is a double o-ring face seal. 18. The brake assembly of claim 1, wherein the area around the seal is enclosed such that coolant only flows into the coolant outlet from the second axial passage through the annular gap. 19. A method of cooling a brake assembly, comprising: directing coolant axially into the brake assembly through a stationary housing to an outer periphery of a disc stack, including directing coolant directly from a coolant inlet into a first axial passage formed between the disc stack and a first spline;directing coolant through the first axial passage formed in the disc stack;directing coolant from the first axial passage radially inward through the disc stack, wherein the first axial passage causes a restriction on a flow of coolant into the disc stack;directing coolant through a second axial passage formed between the disc stack and a second spline;directing coolant from a first end of the second axial passage into an area of a seal disposed at an interface between the stationary housing and a rotatable member; anddirecting coolant from a second end of the second axial passage axially out of the brake assembly through an annular gap,wherein the annular gap reduces the restriction on the flow of coolant caused by the first axial passage. 20. A final drive, comprising: a stationary brake housing forming a coolant inlet and a coolant outlet located radially inward from the coolant inlet;a stationary spindle connected to the stationary brake housing;a wheel;a disc stack disposed within a cavity at least partially formed by the stationary brake housing and the wheel, the disc stack having a plurality of friction plates operatively coupled to the wheel and a plurality of separator plates interleaved with the plurality of friction plates and operatively coupled to the stationary brake housing;a service piston disposed within the cavity and configured to compress the disc stack; anda double o-ring face seal located at an axial interface between the stationary brake housing and the wheel and downstream of the disc stack relative a flow of coolant from the coolant inlet to the coolant outlet,wherein: each of the plurality of friction plates is generally ring-like and includes a first plurality of teeth extending radially inward to engage a second plurality of teeth extending radially outward from the rotatable member such that spaces between adjacent teeth of the first plurality of teeth are substantially filled with teeth from the second plurality of teeth;each of the plurality of separator plates is generally ring-like and includes a third plurality of teeth extending radially-outward to engage a fourth plurality of teeth extending radially inward from the stationary housing such that spaces between adjacent teeth of the third plurality of teeth are substantially filled with teeth from the fourth plurality of teeth; andat least a first tooth of the first plurality of teeth and at least a second tooth of the third plurality of teeth are missing such that at least a first axial passage and at least a second axial passage are formed at locations of the missing at least a first tooth and at least a second tooth;the at least a first axial passage is in direct fluid communication with the coolant inlet and is formed between the disc stack and a first spline; andthe at least a second axial passage is in fluid communication with the coolant outlet through an annular gap and is formed between the disc stack and a second spline,wherein the second axial passage includes a first end located at a first end of the second spline and fluidly connected to an area around the seal and a second end located at a second end of the second spline and fluidly connected to the coolant outlet by an annular gap, andwherein the area around the seal is enclosed except for a fluid connection with the first end of the second axial passage such that coolant only flows from the second axial passage into the coolant outlet through the annular gap.
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이 특허에 인용된 특허 (31)
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Kirkpatrick, Christopher T., Plate assemblies including floating wear linings for multi-disk brake systems and methods for reducing vibration in a multi-disk brake system.
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