Viscous fan drive having modified land design and armature venting
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F16D-035/02
F16D-035/00
출원번호
UP-0366183
(2006-03-02)
등록번호
US-7621386
(2009-12-02)
발명자
/ 주소
Light, Gerard M.
출원인 / 주소
BorgWarner Inc.
대리인 / 주소
Artz, John A.
인용정보
피인용 횟수 :
2인용 특허 :
13
초록▼
A viscous fan drive in which the output drive to the fan is controlled by the movement of viscous fluid from a fluid reservoir and into the operating and working chamber of the coupling during normal operation. The input-coupling assembly and cover member are formed with a unique combination of cont
A viscous fan drive in which the output drive to the fan is controlled by the movement of viscous fluid from a fluid reservoir and into the operating and working chamber of the coupling during normal operation. The input-coupling assembly and cover member are formed with a unique combination of continuous and non-continuous radially extending lands and grooves designed to distribute the viscous fluid in a continuous film throughout the shear zone so as to maximize output fan speed at a given input speed. An armature-venting feature is designed to simplify the opening and closing of the valve disk in an electronic version of the viscous fan drive depending upon the desired operating condition.
대표청구항▼
What is claimed is: 1. An electronically controlled viscous fan drive for use on an internal combustion engine, said fan drive comprising: an output-coupling member including a housing member coupled to a cover member, said cover member including a plurality of non-continuous radially disposed land
What is claimed is: 1. An electronically controlled viscous fan drive for use on an internal combustion engine, said fan drive comprising: an output-coupling member including a housing member coupled to a cover member, said cover member including a plurality of non-continuous radially disposed lands and at least one continuous radially disposed land, said at least one continuous radially disposed land located radially outwardly of said plurality of non-continuous radially disposed lands, said plurality of non-continuous lands of said output-coupling member defining at least one cover member radial slot; an actuator shaft partially disposed within said output-coupling member; an input-coupling assembly coupled to said actuator shaft and including an input-coupling member, said input-coupling assembly and said actuator shaft capable of rotating at a given input speed, said input-coupling member substantially contained within said output-coupling member and including a plurality of non-continuous radially disposed input-coupling lands and at least one continuous radially disposed input-coupling land, said at least one continuous radially disposed input-coupling land located radially outwardly of said plurality of non-continuous radially disposed input-coupling lands, said plurality of non-continuous lands of said input-coupling member defining at least one input-coupling member radial slot; an actuator shaft partially disposed within said output-coupling member; a fluid operating chamber defined by said input-coupling member and said cover member; at least one fill hole contained in said input-coupling member fluidically coupling said fluid reservoir chamber to said fluid operating chamber; a valve disk coupled to said actuator shaft and disposed between said input-coupling member and said reservoir cover, said valve disk being closely coupled with said at least one fill hole and able to control an amount of viscous fluid entering said fluid operating chamber from said fluid reservoir chamber through said at least one fill hole; an actuator subassembly coupled to said input-coupling assembly and including an external controller electrically coupled to an electrical coil, said electrical coil capable of being electrically activated by said external controller to generate a magnetic flux; and an armature coupled around a portion of said actuator shaft and within said actuator subassembly, said armature capable of axial movement along the length of said input-coupling assembly in response to said magnetic flux, therein moving said actuator shaft to position said valve disk relative to said at least one fill hole between an engaged position, a partially engaged position, or in a disengaged position; wherein said engaged position is characterized such that said valve disk is positioned wherein said at least one fill hole is not covered by said valve disk, therein allowing maximum flow of said viscous fluid from said fluid reservoir chamber to said fluid operating chamber to drive said output-coupling member at a maximum rotational speed at said given input speed; wherein said disengaged position is characterized such that said valve disk is positioned wherein said at least one fill hole is covered by said valve disk to prevent flow of said amount of viscous fluid from said fluid reservoir chamber to said fluid operating chamber; and wherein said partially engaged position is characterized such that said valve disk is positioned wherein said at least one fill hole is partially covered by said valve disk to allow a limited amount of said viscous fluid to flow from said fluid reservoir chamber to said fluid operating chamber to drive said output-coupling member at a rotational speed less than said maximum rotational speed. 2. The fan drive as set forth in claim 1, said fan drive further comprising a spring coupled along said actuator shaft, said spring biasing said valve disk in a first position in the absence of said magnetic flux, and said first position selected from the group consisting of said engaged position and said disengaged position. 3. The fan drive as set forth in claim 2, wherein said first position comprises said engaged position. 4. The fan drive as set forth in claim 3, wherein said spring is coupled between said valve disk and a hub portion of said input-coupling assembly. 5. The fan drive as set forth in claim 2, wherein said first position comprises said disengaged position. 6. The fan drive as set forth in claim 5, wherein said spring is coupled between said actuator shaft and said armature. 7. The fan drive as set forth in claim 1, said fan drive further comprising at least one sensor input electrically coupled to said external controller, said at least one sensor input capable of sensing the temperature of said internal combustion engine, wherein said external controller interprets said sensed temperature to determine the amount of electrical signal to send to said electrical coil in response to said sensed engine operating condition to maintain said engine in a desired operating range. 8. The fan drive as set forth in claim 1, wherein: said actuator shaft and said armature define a space therebetween for a quantity of air to escape between a first chamber and a second chamber as said valve disk is moved from between said engaged position, said disengaged position, and said partially engaged position; said first chamber is defined between said actuator shaft, said armature, and said input-coupling assembly; and said second chamber is defined between said actuator shaft, said armature, a bushing, and a plug. 9. The fan drive as set forth in claim 8, wherein said space is defined between a square stock end of said actuator shaft and a rounded inner bore of said armature. 10. the fan drive as set forth in claim 1, said fan drive further comprising at least one cold pump out slot defined by said reservoir cover and said input-coupling member, wherein each of said at least one fill hole is defined between a respective one of said at least one cold pump out slot and said fluid reservoir chamber. 11. A viscous fan drive for use on an internal combustion engine having improved torque generation and an increase in fan speed at a given input speed, said viscous fan drive comprising: a cover member including a plurality of non-continuous radially disposed lands and at least one continuous radially disposed land, said at least one continuous radially disposed land located radially outwardly of said plurality of non-continuous radially disposed lands, said cover member further including at least one cover member radial slot disposed across each of said at least one non-continuous radially disposed lands; and an input-coupling assembly including a plurality of non-continuous radially disposed input-coupling lands and at least one continuous radially disposed input-coupling land, said at least one continuous radially disposed input-coupling land located radially outwardly of said plurality of non-continuous radially disposed input-coupling lands, said input-coupling assembly further including at least one input-coupling radial slot disposed across each of said at least one non-continuous radially disposed input-coupling land; wherein said cover member and said input-coupling assembly are closely coupled so as to define a shear space therebetween in which a quantity of viscous fluid is able to form a continuous film within a portion of said viscous shear space defined between said at least one continuous radially disposed land of said cover member and said at least one continuous radially disposed land of said input-coupling assembly. 12. The viscous fan drive as set forth in claim 11, wherein said at least one continuous radially disposed land of said cover member comprises at least two continuous radially disposed lands. 13. The viscous fan drive as set forth in claim 12, wherein said at least one continuous radially disposed land of said input-coupling assembly comprises at least two continuous radially disposed lands, and said cover member further includes at least one cover member radial slot disposed across each of said at least one non-continuous radially disposed lands. 14. The viscous fan drive as set forth in claim 11, wherein said at least one continuous radially disposed land of said input-coupling assembly comprises at least two continuous radially disposed lands. 15. The viscous fan drive as set forth in claim 11, wherein said at least one continuous radially disposed land of said cover member comprises at least two continuous radially disposed lands, and said at least one continuous radially disposed land of said input-coupling assembly comprises at least two continuous radially disposed lands. 16. The viscous fan drive as set forth in claim 11, wherein said input-coupling assembly comprises at least two input-coupling radial slots disposed across each of said at least one non-continuous radially disposed input-coupling land, said cover member further includes at least two cover member radial slots disposed across each of said at least one non-continuous radially disposed lands, and each one of said at least two input-coupling radial slots is aligned and coupled to a respective one of said cover member radial slots.
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이 특허에 인용된 특허 (13)
LaFlame Frank E. (Dayton OH), Electro-viscous fan clutch assembly.
Stagg, Jonathan B.; Settineri, Samuel E., Apparatus employing shear forces to transmit energy having flow altering structures configured to increase heat rejection from a working fluid and related method.
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