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Morning sickness valve system for viscous clutch

A viscous clutch, clutch technology, applied in the field of valve system, can solve the problems of noise, restarting fans, etc.

Active Publication Date: 2018-06-08
HORTON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One problem encountered with viscous clutches is the so-called "restart evil" (also known as "fan noise", "spinning", and other terms)

Method used

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  • Morning sickness valve system for viscous clutch
  • Morning sickness valve system for viscous clutch
  • Morning sickness valve system for viscous clutch

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Embodiment Construction

[0017] In general, the present invention provides a valve system for helping to reduce or prevent the so-called "restart evil" when a viscous clutch receives rotational input after a period of inactivity (ie, an idle period). It is desirable for a viscous clutch to retain fluid in a reservoir when the clutch is not used for an extended period of time, such as when the engine powering the clutch is turned off. If the fluid reservoir is not sealed, shear fluid may leak into the working chamber and cause excess output torque from the clutch (eg, to a fan or other output device) the next time the engine is started. The restart-bad valve system can help selectively seal the reservoir to help retain shear fluid therein during idle / shutdown conditions, thereby reducing or eliminating the "restart-bad" phenomenon. Cam configurations (eg, face cam or linear cam configurations) may be used in some embodiments to facilitate improved sealing of restart fault valve systems. It should be n...

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PUM

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Abstract

A valve system (44) for reducing morning sickness effects in a viscous clutch (20) having a reservoir (38) with a bore (46-1) includes a valve element (44-1), a counterweight portion (44-2), a pivot (44-3), and a biasing member (44-4). The pivot is located in between the valve element and the counterweight portion, and the valve element and the counterweight portion are configured to commonly moveabout the pivot between open and closed positions. The biasing member is configured to bias the valve element to cover the bore in the closed position by default. The counterweight portion is configured to counteract the biasing member under centrifugal loading such that the valve element at least partially uncovers the bore in the open position.

Description

technical field [0001] The present invention relates generally to valve systems and, more particularly, to a valve system for use with viscous clutches to reduce the effects of "morning sickness". Background technique [0002] Viscous clutches are used in a variety of applications, such as automotive fan drive applications. These clutches typically use a relatively thick silicone oil (more generally known as a shear or viscous fluid) for selectively transmitting torque between two rotatable components. Engagement or disengagement of the clutch is made possible by selectively allowing oil to enter and leave the working area of ​​the clutch between the input and output members (for example, between the rotor and the housing), where viscosity can be created by the oil Shear joints to transfer torque from an input member to an output member. Valves are used to control the flow of oil into and / or out of a work area. When the clutch is disengaged, some recent clutch designs all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16D35/02
CPCF16D35/021F16D35/024F16D35/025F16D2121/20F16K17/36F16D2300/0212
Inventor 迈克尔·史蒂文斯詹姆斯·R·普雷斯顿
Owner HORTON
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