DE4441808A1 - Hydraulic friction clutch for automobile cooling fan - Google Patents

Hydraulic friction clutch for automobile cooling fan

Info

Publication number
DE4441808A1
DE4441808A1 DE19944441808 DE4441808A DE4441808A1 DE 4441808 A1 DE4441808 A1 DE 4441808A1 DE 19944441808 DE19944441808 DE 19944441808 DE 4441808 A DE4441808 A DE 4441808A DE 4441808 A1 DE4441808 A1 DE 4441808A1
Authority
DE
Germany
Prior art keywords
friction clutch
clutch
piezoelectric ceramic
chamber
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19944441808
Other languages
German (de)
Inventor
Armin Dipl Ing Eitelmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle Behr GmbH and Co KG
Mahle Behr GmbH and Co KG
Original Assignee
Behr GmbH and Co KG
Mahle Behr GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Behr GmbH and Co KG, Mahle Behr GmbH and Co KG filed Critical Behr GmbH and Co KG
Priority to DE19944441808 priority Critical patent/DE4441808A1/en
Publication of DE4441808A1 publication Critical patent/DE4441808A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D35/00Fluid clutches in which the clutching is predominantly obtained by fluid adhesion
    • F16D35/02Fluid clutches in which the clutching is predominantly obtained by fluid adhesion with rotary working chambers and rotary reservoirs, e.g. in one coupling part
    • F16D35/021Fluid clutches in which the clutching is predominantly obtained by fluid adhesion with rotary working chambers and rotary reservoirs, e.g. in one coupling part actuated by valves
    • F16D35/022Fluid clutches in which the clutching is predominantly obtained by fluid adhesion with rotary working chambers and rotary reservoirs, e.g. in one coupling part actuated by valves the valve being actuated by a bimetallic strip
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00Actuating devices; Operating means; Releasing devices
    • F16K31/004Actuating devices; Operating means; Releasing devices actuated by piezo-electric means
    • F16K31/005Piezo-electric benders

Abstract

The clutch has a supply chamber (5) and a working chamber (60), with a control valve for controlling the fluid circulation between them. The valve lever (9) is operated directly or indirectly via a piezoceramic operating element (13).Pref. the piezoceramic operating element is coupled to an electronic regulation stage providing a temp-dependent regulation signal. The piezoceramic operating element is pref. contained within the supply chamber of the clutch.

Description

The invention relates to a fluid friction clutch, especially for a fan for cooling a motor vehicle zeugmotors, with a pantry and a work chamber mer, which encloses a driven clutch disc, wherein at least between the pantry and the working chamber an inflow and at least one return for circulation of shear liquid are provided, as well as with at least a control valve to control the circulation of the shear liquid that by means of at least one controllable actuator supply element is movable.

DE 38 29 322 C2 is a fluid friction clutch known to work in a partition between a chamber and a pantry provided an inlet opening which can be closed by means of a valve lever. Of the Valve lever is on the outside of the housing arranged bimetallic strip movable, to the connec the bimetal strip with the valve lever through the Linear movable pin protruding through the housing wall is seen. A movement of the valve lever is caused by a Change in the bend of the bimetallic strip caused the  depends on the coolness flowing around the bimetallic strip exhaust air temperature. The bimetal strip reacts to Tempe rature changes relatively sluggish.

The object of the invention is a fluid friction clutch tion of the type mentioned to create a relative enables precise switching on and off.

This object is achieved in that as an actuator at least one piezoelectric ceramic body is provided is the ver with the control valve directly or indirectly is bound. By using such a piezokera mixing actuator results in a compared to the state of the art nik significantly reduced response time, thanks to which an accurate res Switching the fluid friction clutch on and off is possible. In addition, the piezoceramic actuator le only a low power consumption.

In one embodiment of the invention, the piezoelectric ke assigned a power amplifier. The lei power amplifier is depending on need with a correspondingly large Actuation path for opening and closing the control valve used.

In a further embodiment of the invention is the piezoelectric rule ceramic electronics associated with the temperature-dependent control variables is fed. Thereby he there is a temperature-dependent regulation of the liquid friction clutch, especially for the use of the rivers Fluid friction clutch in a fan for cooling a Motor vehicle engine is suitable.

In a further embodiment of the invention, the piezoelectric cal ceramic body arranged within the pantry. This measure makes the piezoelectric ceramic body space-saving.  

In a further embodiment of the invention, the piezoelectric cal ceramic body on an outside of the clutch housing arranged and by means of an inside of the clutch housing projecting connecting pin connected to the control valve sen. As a result, the piezoelectric ceramic body is located not within the working chamber and therefore does not come with the shear liquid, preferably a highly viscous Si Liquor oil, in combination.

Further advantages and features of the invention result from the subclaims and from the description below of preferred embodiments of the invention hand of the drawings are shown.

Fig. 1 shows in a section an embodiment of a fluid friction clutch according to the invention, which is provided with a piezoceramic actuator arranged on an outside of the clutch housing and

Fig. 2 in a sectional view another example of Ausfüh approximately a fluid friction clutch according to the invention similar to FIG. 1, in which a corresponding piezoceramic actuator is provided in the interior of the pantry.

A fluid friction clutch according to FIG. 1 is provided for a fan for cooling a motor vehicle engine. The fluid friction clutch ( 1 ) has a flange shaft ( 2 ) which is driven indirectly or directly via the motor vehicle engine, to which a clutch disc ( 3 ) is connected in a rotationally fixed manner. With the help of a ball bearing, a coupling housing ( 4 ) is rotatably mounted on the flange shaft ( 2 ). The liquid friction clutch is ver on the outer circumference of the clutch housing ( 4 ) in a manner not shown with fan blades and is arranged in the direction of travel of the motor vehicle behind a cooler. The clutch housing ( 4 ) has a storage chamber ( 5 ) in which shear fluid, in the example of a high-viscosity silicone oil, is stored. The clutch disc ( 3 ) is enclosed without contact by a working chamber ( 6 ), which is separated from the storage chamber ( 5 ) by a partition ( 11 ). In the partition ( 11 ) an inlet opening ( 8 ) is provided, which is closed by a Ventilhe bel ( 9 ). At the level of the outer edge of the hitch be disc ( 3 ) is also a return channel ( 16 ) vorgese hen, which leads the shear fluid from the working chamber ( 6 ) as that back into the storage chamber ( 5 ). As soon as the valve lever releases the inlet opening ( 8 ), the shear fluid circulates between the working chamber ( 6 ) and the storage chamber ( 5 ), with the shear fluid inlet via the inlet opening ( 8 ) and the return via the return channel ( 16 ) . The valve lever ( 9 ) is fastened by means of two fastening rivets ( 10 ) to the partition ( 11 ).

To actuate the valve lever (9), ie to the Zulauföff voltage to close or release (8), is on one of the stub shaft (2) opposite the outside of the clutch housing (4) coaxially to the rotation axis of the coupling housing (4), a piezoelectric ceramic body ( 13 ) arranged in a housing ( 12 ). The piezoelectric ceramic body ( 13 ) is arranged within the housing ( 12 ) in such a way that it expands when subjected to an electrical voltage coaxially to the axis of rotation of the clutch housing ( 4 ) and thus the flange shaft ( 2 ). The housing (12) is rigidly connected to said stub shaft (2) opposite the end wall of the clutch housing (4). From the piezoelectric ceramic body ( 13 ), which serves as an actuator, a transmission pin ( 14 ) protrudes through the end wall of the clutch housing ( 4 ) and is connected with its front end to the valve lever ( 9 ). The transmission pin ( 14 ) transmits axial changes in thickness of the piezoelectric ceramic body ( 13 ) on the valve lever ( 9 ), ie movements in which the piezoelectric ceramic body ( 13 ) expands or contracts. The valve lever ( 9 ) is opened or closed in accordance with this axial movement of the ceramic body ( 13 ). On an outside of the housing ( 12 ), a power amplifier ( 15 ) is arranged, which is connected by means of an electrical line both to the ceramic body ( 13 ) and to control electronics, not shown. The control electronics perform a temperature-dependent control of the circulation of the shear fluid, a temperature sensor being arranged in a coolant circuit for cooling the motor vehicle engine.

As soon as the air flowing through the radiator no longer provides sufficient cooling, particularly when driving slowly or when the motor vehicle is stationary, the coolant temperature in the radiator rises. The temperature sensor in the coolant circuit transmits corresponding signals to the control electronics, which in turn emits corresponding electrical signals to the piezoelectric ceramic body ( 13 ). As soon as the temperature rises above a certain value, the application of voltage to the ceramic body ( 13 ) is interrupted, whereupon it contracts. By means of the transmission pin ( 14 ) the valve lever ( 9 ) is pulled outwards and releases the inlet opening ( 8 ). As a result, shear fluid flows into the working chamber ( 4 ) and transmits a torque between the rotating clutch disc ( 3 ) and the clutch housing ( 4 ) in the working chamber. The clutch housing ( 4 ) begins to rotate together with the flange shaft ( 2 ), which also causes the fan blades to rotate. The fan is switched on until the temperature of the coolant has dropped again. Due to the short reaction time of the piezoelectric ceramic body ( 13 ), a relatively precise connection of the fluid friction clutch ( 1 ) is possible. The piezoelectric ceramic body ( 13 ) has a low power consumption.

In a preferred embodiment of the invention, the valve lever ( 9 ) is opened and closed by means of a clock control, as is known from EP 0 009 415 B1. This is caused by an appropriately clocked voltage loading of the ceramic body ( 13 ). Due to the determined pulse ratio, more or less shear fluid flows into the working chamber in accordance with the proportion of the "open" at the "too" time, which results in different fan speeds.

In an embodiment of the invention, not shown Two or more piezoelectric ceramic bodies are provided seen. Otherwise, this embodiment corresponds to that previously described embodiment.

The liquid friction clutch according to FIG. 2 essentially corresponds to the liquid friction clutch according to FIG. 1, with corresponding parts also being provided with the same reference symbols. In this fluid friction clutch, however, a piezoelectric ceramic body ( 13 a) is not arranged on the outside of the clutch housing ( 4 ), but within the storage chamber ( 5 ). The plate-like ceramic body ( 13 a) is held on an annular support bracket ( 12 a) which is rigidly connected to the inner wall of the end wall of the clutch housing ( 4 ). The support bracket ( 12 a) supports the ceramic body ( 13 a) so stably that it can diglich le when exposed to an electrical voltage in the axial direction of the support bracket ( 12 a) away. The piezoelectric ceramic body ( 13 a) is embedded oil-tight in the support bracket ( 12 a). The piezoelectric ceramic body (13 a) ends with its geek te directly to a web-like bulge of the valve lever (9), being so connected to the valve lever (9), that it on the valve lever (9) both compressive and Can exert train loads. For this purpose, the piezoelectric ceramic body ( 13 a) is glued, for example, to the web-like bulge ( 14 a). The housing of the power amplifier ( 15 a) is also in the fluid friction clutch according to FIG. 2 on the outside of the clutch housing ( 4 ) and arranged by means of an inside of the clutch housing ( 4 ) leading electrical line to the ceramic body ( 13 a). Like the power amplifier ( 15 ) according to FIG. 1, the power amplifier ( 15 a) is also connected to control electronics which regulate the temperature accordingly.

Claims (5)

1. Fluid friction clutch, in particular for a fan for cooling a motor vehicle engine, with an on-board chamber and a working chamber, which encloses a driven clutch disc, wherein at least one inlet and at least one return line for the circulation of shear liquid are provided between the before-chamber and the working chamber are, and with at least one control valve for controlling the circulation of the shear fluid, which is movable by means of at least one controllable actuating element, characterized in that at least one piezoelectric ceramic body ( 13 , 13 a) is provided as the actuating element, which with the control valve ( 9 ) is directly or indirectly connected.
2. Fluid friction clutch according to claim 1, characterized in that the piezoelectric ceramic body ( 13 , 13 a) is associated with a power amplifier ( 15 , 15 a).
3. A fluid friction clutch according to claim 1 or 2, characterized in that the piezoelectric ceramic body ( 13 , 13 a) is associated with control electronics which are fed with temperature-dependent control variables.
4. Liquid friction clutch according to one of the preceding claims, characterized in that the piezoelectric ceramic body ( 13 ) is arranged within the storage chamber ( 5 ).
5. Fluid friction clutch according to one of claims 1 to 3, characterized in that the piezoelectric ceramic body ( 13 a) on an outside of the clutch housing ( 4 ) is arranged and by means of an inside of the clutch housing ( 4 ) projecting transmission pin ( 14 ) to the Control valve ( 9 ) is connected.
DE19944441808 1994-11-24 1994-11-24 Hydraulic friction clutch for automobile cooling fan Withdrawn DE4441808A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19944441808 DE4441808A1 (en) 1994-11-24 1994-11-24 Hydraulic friction clutch for automobile cooling fan

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19944441808 DE4441808A1 (en) 1994-11-24 1994-11-24 Hydraulic friction clutch for automobile cooling fan

Publications (1)

Publication Number Publication Date
DE4441808A1 true DE4441808A1 (en) 1996-05-30

Family

ID=6534021

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19944441808 Withdrawn DE4441808A1 (en) 1994-11-24 1994-11-24 Hydraulic friction clutch for automobile cooling fan

Country Status (1)

Country Link
DE (1) DE4441808A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19732631A1 (en) * 1997-07-30 1999-02-04 Behr Gmbh & Co Fluid friction clutch for vehicle
US6079536A (en) * 1997-03-13 2000-06-27 Behr Gmbh & Co. Rotational speed control arrangement for a fluid friction coupling
DE102012014908A1 (en) * 2012-07-27 2014-01-30 Robert Bosch Gmbh Self-sufficient radiator control valve with linear piezo motor

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2110797A (en) * 1981-12-05 1983-06-22 Fichtel & Sachs Ag Temperature-controlled fluid coupling
DE8326486U1 (en) * 1983-09-15 1985-02-28 Sueddeutsche Kuehlerfabrik Julius Fr. Behr Gmbh & Co Kg, 7000 Stuttgart, De Liquid friction coupling
DE3337234A1 (en) * 1983-10-13 1985-04-25 Wabco Westinghouse Steuerung Valve device with a piezoelectric or magnetostrictive actuator
DE3625976A1 (en) * 1986-07-31 1988-02-11 Linnig Karl Heinz Liquid friction clutch
EP0378341A2 (en) * 1989-01-13 1990-07-18 Kysor Industrial Corporation Viscous fluid shear clutches and control valves therefor
DE4013216A1 (en) * 1989-05-22 1990-11-29 Gen Motors Corp ELECTROMAGNETIC CONTROL ARRANGEMENT FOR A VISCOSFLUID FAN COUPLING
DE4036287A1 (en) * 1989-11-14 1991-05-23 Hitachi Metals Ltd Flow rate control valve using a high temperature stack type piston
DE3829322C2 (en) * 1988-08-30 1993-06-17 Behr Gmbh & Co, 7000 Stuttgart, De
US5226628A (en) * 1992-02-06 1993-07-13 Siemens Automotive L.P. Actuating mechanism for a rolling ball valve
DE9317085U1 (en) * 1993-11-09 1993-12-23 Behr Gmbh & Co Fluid friction clutch with anti-rotation device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2110797A (en) * 1981-12-05 1983-06-22 Fichtel & Sachs Ag Temperature-controlled fluid coupling
DE8326486U1 (en) * 1983-09-15 1985-02-28 Sueddeutsche Kuehlerfabrik Julius Fr. Behr Gmbh & Co Kg, 7000 Stuttgart, De Liquid friction coupling
DE3337234A1 (en) * 1983-10-13 1985-04-25 Wabco Westinghouse Steuerung Valve device with a piezoelectric or magnetostrictive actuator
DE3625976A1 (en) * 1986-07-31 1988-02-11 Linnig Karl Heinz Liquid friction clutch
DE3829322C2 (en) * 1988-08-30 1993-06-17 Behr Gmbh & Co, 7000 Stuttgart, De
EP0378341A2 (en) * 1989-01-13 1990-07-18 Kysor Industrial Corporation Viscous fluid shear clutches and control valves therefor
DE4013216A1 (en) * 1989-05-22 1990-11-29 Gen Motors Corp ELECTROMAGNETIC CONTROL ARRANGEMENT FOR A VISCOSFLUID FAN COUPLING
DE4036287A1 (en) * 1989-11-14 1991-05-23 Hitachi Metals Ltd Flow rate control valve using a high temperature stack type piston
US5226628A (en) * 1992-02-06 1993-07-13 Siemens Automotive L.P. Actuating mechanism for a rolling ball valve
DE9317085U1 (en) * 1993-11-09 1993-12-23 Behr Gmbh & Co Fluid friction clutch with anti-rotation device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6079536A (en) * 1997-03-13 2000-06-27 Behr Gmbh & Co. Rotational speed control arrangement for a fluid friction coupling
DE19732631A1 (en) * 1997-07-30 1999-02-04 Behr Gmbh & Co Fluid friction clutch for vehicle
DE102012014908A1 (en) * 2012-07-27 2014-01-30 Robert Bosch Gmbh Self-sufficient radiator control valve with linear piezo motor
DE102012014908B4 (en) * 2012-07-27 2015-02-05 Robert Bosch Gmbh Self-sufficient radiator control valve with linear piezo motor

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Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8139 Disposal/non-payment of the annual fee