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Viscous clutch with minimum output speed

A clutch and viscous technology, applied in the field of clutches, can solve problems such as obstructing oil flow and low output speed of clutches

Inactive Publication Date: 2015-12-23
HORTON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This also allows the clutch to have very low output speeds (e.g. fan speeds) while the valve is positioned to block oil flow into the working area

Method used

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  • Viscous clutch with minimum output speed
  • Viscous clutch with minimum output speed
  • Viscous clutch with minimum output speed

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Embodiment Construction

[0010] The present invention relates to viscous clutch assemblies suitable for use as fan clutches in automotive applications and associated methods of use. In general, the clutch (or driver) may include a bypass bore (or passage) and a valve bore (or passage) each extending between the reservoir and the working chamber. A viscous (or shear) fluid may be introduced into the working chamber to create a viscous shear coupling to transmit torque between an input and an output, such as from an engine to a cooling fan. A return hole may provide a return path for the viscous fluid from the working chamber to the reservoir. The bypass hole may remain open and unobstructed during all operating conditions so that viscous fluid may pass continuously from the reservoir to the working chamber through the bypass hole to the clutch input and output at all times (or Exceeded) minimum threshold to maintain sticky bonding. The valve may be positioned to selectively cover and expose the valve...

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Abstract

A viscous clutch includes a rotor, a housing member, a working chamber located between the housing member and the rotor, a reservoir to hold viscous fluid that is configured to rotate with the rotor, a return bore in fluid communication between the working chamber and the reservoir, a first passage from the reservoir to the working chamber, a second passage from the reservoir to the working chamber, and a valve. The second passage is spaced from the first passage, and can extend substantially radially through the rotor. The valve is configured to selectively regulate flow of the viscous fluid through the first passage, and the second passage is unobstructed such that the viscous fluid can pass from the reservoir to the working chamber regardless of the operational state of the valve. Viscous fluid present in the working chamber rotationally couples the rotor and the housing member.

Description

technical field [0001] This invention relates generally to clutches, and more particularly to viscous clutches. Background technique [0002] Among other uses, viscous clutches are used in a variety of automotive fan drive applications. These clutches typically use relatively thick silicone oils (often referred to as shear fluids or viscous fluids) for selectively transmitting torque between two rotating parts. A clutch may be engaged or disengaged by selectively allowing oil to enter and exit a working area of ​​the clutch positioned between an input member and an output member (eg, between an input rotor and an output housing). Valves are used to control the flow of oil in the working area between the input and output. More recent clutch designs have been used which allow oil to be stored in the rotating input portion of the clutch when the clutch is disengaged to keep kinetic energy available to the oil to allow rapid engagement of the clutch from a closed state. This ...

Claims

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Application Information

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IPC IPC(8): F16D35/02
CPCF16D35/024F16D35/029F16D33/10F16D35/02F16D35/027F16D35/028F16D35/021F16D2500/10468
Inventor 德里克·萨维拉斯科特·米勒
Owner HORTON
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