[특허]Brake assembly having wear and failure indicator

Caterpillar Inc.

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특허 상세정보

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내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Brake assembly having wear and failure indicator

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F16D-066/02
미국특허분류(USC)	188/001.11W;
출원번호	US-0646351 (2012-10-05)
등록번호	US-8807290 (2014-08-19)
발명자 / 주소	Kubicki, David A. Worsham, Wesley C. Kaufman, Bradley G.
출원인 / 주소	Caterpillar Inc.
대리인 / 주소	Finnegan, Henderson, Farabow, Garrett & Dunner LLP
인용정보	피인용 횟수 : 0 인용 특허 : 11

초록
▼

A brake assembly for a mobile machine is disclosed. The brake assembly may have a brake housing, an output member rotatably disposed within the brake housing, and a disc stack disposed within a cavity of the brake housing. The disc stack may include a plurality of friction discs coupled to the output member and a plurality of separator plates interleaved with the plurality of friction discs and coupled to the brake housing. The brake assembly may also have a piston disposed within the cavity and configured to compress the disc stack, and an indicator received within a bore of the brake housing against the piston. The indicator may include a first feature configured to provide at least one of visual and tactile indication of wear of the disc stack, and a second feature configured to provide at least one of a visual and tactile indication of failure of the disc stack.

대표
청구항
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1. A brake assembly, comprising: a brake housing;an output member rotatably disposed within the brake housing;a disc stack disposed within a cavity of the brake housing, the disc stack having a plurality of friction discs operatively coupled to the output member and a plurality of separator plates interleaved with the plurality of friction discs and being operatively coupled to the brake housing;a piston disposed within the cavity and configured to compress the disc stack; andan indicator slidingly received within a bore of the brake housing against the piston, the indicator having a first feature configured to provide at least one of visual and tactile indication of wear of the disc stack, and a second feature configured to provide at least one of a visual and tactile indication of failure of the disc stack, wherein the first feature is and the second feature is a shoulder located at a base of the tip. 2. The brake assembly of claim 1, wherein the tip of the first feature is a cylindrical tip that protrudes past an end face of the bore during a brake check procedure when additional use of the disc stack is acceptable and is flush with or is recessed within the bore during the brake check procedure when the disc stack should be replaced. 3. The brake assembly of claim 2, wherein the shoulder of the second feature protrudes from the bore during the brake check procedure only when a failure of the disc stack has occurred. 4. The brake assembly of claim 3, wherein the indicator includes: an annular recess located about midway along a length direction; anda seal fitted within the annular recess and configured to engage annular walls of the bore. 5. The brake assembly of claim 3, wherein the indicator has: an internal end opposite the first feature; anda chamfer formed at the internal end. 6. The brake assembly of claim 3, wherein: an outer diameter of the indicator is about 5.85-5.90 mm; andan internal diameter of the bore is about 5.95 mm. 7. The brake assembly of claim 6, wherein an outer diameter of the cylindrical tip is about 3.0-3.25 mm. 8. The brake assembly of claim 3, wherein: an overall length of the indicator is about 98.8-98.9 mm; anda length of cylindrical tip is about 2.75-3.15 mm. 9. The brake assembly of claim 1, further including a cap configured to engage the brake housing and enclose an end of the indicator. 10. The brake assembly of claim 9, wherein the bore is tapped to receive threads of the cap. 11. The brake assembly of claim 1, wherein the bore is positioned to align the indicator with an annular lip of the piston. 12. The brake assembly of claim 11, further including a plurality of springs located at a side of the piston opposite the indicator, the plurality of springs configured to bias the piston away from the disc stack and toward the indicator. 13. The brake assembly of claim 1, further including an end cover configured to close off the cavity of the brake housing, the end cover and brake housing together configured to hold a volume of coolant. 14. The brake assembly of claim 13, wherein: the brake housing further includes an adjustment port oriented generally parallel with the bore and configured to receive a movement limiter associated with the piston;the bore is located at about a twelve o'clock position relative to the pull of gravity when assembled to a mobile machine on level ground; andthe adjustment port is located at about a one o'clock or eleven o'clock position. 15. A wear and failure indicator for a brake assembly, comprising: an elongated pin member having a first end configured to engage a piston of the brake assembly, and an opposing second end;a wear feature located at the second end and configured to provide at least one of a visual and tactile feedback regarding a wear condition of a disc stack of the brake assembly, wherein the wear feature includes a tip; anda failure feature located between the first and second ends, the failure feature configured to provide at least one of a visual and tactile feedback regarding a failure condition of the disc pack, wherein the failure feature includes a shoulder located at a base of the tip. 16. The wear and failure indicator of claim 15, wherein: the elongated pin member includes an internal end; andthe tip of the wear feature is a cylindrical tip located at an end opposite the internal end. 17. The wear and failure indicator of claim 16, wherein the wear and failure indicator includes: an annular recess located about midway along a length direction; andan o-ring seal fitted within the annular recess. 18. The wear and failure indicator of claim 16, further including a chamfer formed at the internal end. 19. The wear and failure indicator of claim 16, wherein: an outer diameter of the wear and failure indicator is about 5.85-5.90 mm; andan outer diameter of the cylindrical tip is about 3.0-3.25 mm. 20. The wear and failure indicator of claim 19, wherein: an overall length of the wear and failure indicator is about 98.8-98.9 mm; anda length of cylindrical tip is about 2.75-3.15 mm. 21. A brake housing for a brake assembly, comprising: a cylindrical housing member having an axial inboard end and an axial outboard end, the cylindrical housing member forming a generally hollow enclosure configured to receive a disc stack and a piston of the brake assembly;an opening formed in the inboard end of the cylindrical housing member and configured to receive a shaft passing through the disc stack;an indicator bore formed in the inboard end radially outward of the opening at an assembled twelve o'clock position, the indicator bore configured to receive a pin that engages an end of the piston, andan adjustment port generally parallel with the indicator bore. 22. The brake housing of claim 21, wherein: the generally hollow enclosure includes first and second steps configured to receive a shoulder and an annular lip of a piston; andthe indicator bore passes through the second step. 23. The brake housing of claim 21, wherein the adjustment port is formed at an assembled one o'clock or eleven o'clock position, and passes through the second step. 24. The brake housing of claim 21, further including a threaded boss formed at the indicator bore in the axial inboard end.

이 특허에 인용된 특허 (11)

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Brake assembly having wear and failure indicator

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Brake assembly having wear and failure indicator

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