GB2193785A - A device for controlling the flow behaviour of fluids - Google Patents

A device for controlling the flow behaviour of fluids Download PDF

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Publication number
GB2193785A
GB2193785A GB08719303A GB8719303A GB2193785A GB 2193785 A GB2193785 A GB 2193785A GB 08719303 A GB08719303 A GB 08719303A GB 8719303 A GB8719303 A GB 8719303A GB 2193785 A GB2193785 A GB 2193785A
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United Kingdom
Prior art keywords
flow
piston
fluid
cross
section
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.)
Granted
Application number
GB08719303A
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GB8719303D0 (en
GB2193785B (en
Inventor
Michael Mettner
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB8719303D0 publication Critical patent/GB8719303D0/en
Publication of GB2193785A publication Critical patent/GB2193785A/en
Application granted granted Critical
Publication of GB2193785B publication Critical patent/GB2193785B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
    • F16F9/46—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction allowing control from a distance, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall
    • F16F9/466—Throttling control, i.e. regulation of flow passage geometry
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2401/00—Indexing codes relating to the type of sensors based on the principle of their operation
    • B60G2401/10—Piezoelectric elements

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

A device for controlling the flow behaviour of fluids in a flow-through cross-section (8), such as in a damper (1), comprises an oscillation generator (13), such as a planar oscillator or thickness vibrator, which can produce oscillations in the flow- through cross-section (8), whereby varying the damping characteristic. As shown, the oscillation generator (13) is a piezoelectric planar oscillator sandwiched between electrode plates (9, 10) which are connected to an external alternating current generator (14). <IMAGE>

Description

SPECIFICATION A device for controlling the flow behaviour of fluids The invention relates to a device for controlling the flow behaviour of fluids in a flowthrough cross-section lying in a velocity field.
A known device of this general type is described in GB-A 21 11171. In this known type of construction, the rheological fluid is used, and an electric device is provided in a passage through a piston or in an annular chamber between a piston and a cylinder wall inside or outside a shock absorber, using which electric device it is possible to control the rheological behaviour of the fluid. An alteration to the damper characteristic of the shock absorber can thereby be achieved.
However, it is disadvantageous that the electrorheological effects are too small for most applications and that there is still no rheological fluid which is thermally stable. If, for example, mechanical energy is to be dissipated in the absorber, the rheological fluid heats up and becomes mechanically weaker.
Variations in external temperature also alter the rheological fluid. The losses of effective electrical efficiency increase exponentially with temperature and hence cause a further increase in temperature. The electrical control power required hence rapidly reaches unrealistic ranges.
In accordance with the present invention, there is provided a device for controlling the flow behaviour of fluids in a flow-through cross-section lying in a velocity field, the device having a means by which oscillations can be generated in the flow-through cross-section, which oscillations are superimposed on the velocity field of the fluid as a velocity gradient of defined amplitude.
A device in accordance with the invention has the advantage that variations in temperature do not have any influence on the stability of the fluid and that dilatant fiquids having an adequate effect are available.
The invention is described further hereinafter, by way of example, with reference to the accompanying drawing, which illustrates one embodiment of a device in accordance with the present invention.
A damper element 1 of a vehicle suspension (not shown) has a damping cylinder 2 and a piston 3 in the cylinder 1. A piston rod 4 is fastened to the piston 3 and its free end 5 protrudes from the cylinder 1. The end 5 of the piston rod and the damping cylinder 2 are mounted on vehicle parts which move towards and away from one another in the course of vehicle vibration.
In the damping cylinder 2, there are two working chambers 6 and 7 which are filled with a dilatant damping fluid and are separated by the piston 3. The dilatant damper fluid has a viscosity which is alterable in a flow-through cross-section 8 between the outer wall of the piston 3 and the inner wall of the cylinder 2.
The flow-through cross section 8 can be altered in that the central part 13 of the piston 3 is formed by a piezoelectric planar oscillator. For this purpose, two piston end plates 9 and 100 are in the form of electrodes which are connected by way of lines 11 and 12 in the piston rod 4 to an external alternating-current power generator 14.
The lower piston chamber 7 is defined by a gas compensating chamber 15, a separating piston 16 being provided at the point of separation of the piston chamber 7 and gas compensating chamber 15.
When the damper element 1 is operating, fluid flows by way of the flow-through crosssection 8 from one working chamber 6 or 7 into the other. At the same time, the flow cross-section 8 forms a resistance with respect to the flow mechanics. This resistance can be altered in that the piezoelectric planar oscillator 13 is used to alter the piston diameter, hence forming a shear gradient of smaller amplitude. This is superimposed on the fluid, in particular its speed, which is flowing through the flow-through cross-section 8 as a result of the movement of the piston 3 in the cylinder 2.
The flow-through cross-section 8, which can be altered by the planar oscillator 13, and the shear gradient produced by it, can also be controlled by a sound or ultrasonic field. In contrast to the described embodiment, the shear gradient can also be produced by a thickness vibrator as a transverse vibration (that is, in the axial direction).
The important point is that, according to the invention, overall shear gradients are produced, depending on amplitude, in the region of marked alterations in the viscosity of the fluid, and that the damping characteristic of the damper element 1 can thus be altered.
Inter alia, the invention can be used in connection with the following additional applications: 1. Throttling fluid flow in hydraulic systems, for example in the pre-control of proportional or servo valves; 2. Controllable flow couplings; and 3. Controllable actuators.
1. A device for controlling the flow behaviour of fluids in a flow-through cross-section lying in a velocity field, the device having a means by which oscillations can be generated in the flow-through cross-section, which oscillations are superimposed on the velocity field of the fluid as a velocity gradient of defined amplitude.
2. A device as claimed in claim 1, wherein the means of producing the oscillations in the
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A device for controlling the flow behaviour of fluids The invention relates to a device for controlling the flow behaviour of fluids in a flowthrough cross-section lying in a velocity field. A known device of this general type is described in GB-A 21 11171. In this known type of construction, the rheological fluid is used, and an electric device is provided in a passage through a piston or in an annular chamber between a piston and a cylinder wall inside or outside a shock absorber, using which electric device it is possible to control the rheological behaviour of the fluid. An alteration to the damper characteristic of the shock absorber can thereby be achieved. However, it is disadvantageous that the electrorheological effects are too small for most applications and that there is still no rheological fluid which is thermally stable. If, for example, mechanical energy is to be dissipated in the absorber, the rheological fluid heats up and becomes mechanically weaker. Variations in external temperature also alter the rheological fluid. The losses of effective electrical efficiency increase exponentially with temperature and hence cause a further increase in temperature. The electrical control power required hence rapidly reaches unrealistic ranges. In accordance with the present invention, there is provided a device for controlling the flow behaviour of fluids in a flow-through cross-section lying in a velocity field, the device having a means by which oscillations can be generated in the flow-through cross-section, which oscillations are superimposed on the velocity field of the fluid as a velocity gradient of defined amplitude. A device in accordance with the invention has the advantage that variations in temperature do not have any influence on the stability of the fluid and that dilatant fiquids having an adequate effect are available. The invention is described further hereinafter, by way of example, with reference to the accompanying drawing, which illustrates one embodiment of a device in accordance with the present invention. A damper element 1 of a vehicle suspension (not shown) has a damping cylinder 2 and a piston 3 in the cylinder 1. A piston rod 4 is fastened to the piston 3 and its free end 5 protrudes from the cylinder 1. The end 5 of the piston rod and the damping cylinder 2 are mounted on vehicle parts which move towards and away from one another in the course of vehicle vibration. In the damping cylinder 2, there are two working chambers 6 and 7 which are filled with a dilatant damping fluid and are separated by the piston 3. The dilatant damper fluid has a viscosity which is alterable in a flow-through cross-section 8 between the outer wall of the piston 3 and the inner wall of the cylinder 2. The flow-through cross section 8 can be altered in that the central part 13 of the piston 3 is formed by a piezoelectric planar oscillator. For this purpose, two piston end plates 9 and 100 are in the form of electrodes which are connected by way of lines 11 and 12 in the piston rod 4 to an external alternating-current power generator 14. The lower piston chamber 7 is defined by a gas compensating chamber 15, a separating piston 16 being provided at the point of separation of the piston chamber 7 and gas compensating chamber 15. When the damper element 1 is operating, fluid flows by way of the flow-through crosssection 8 from one working chamber 6 or 7 into the other. At the same time, the flow cross-section 8 forms a resistance with respect to the flow mechanics. This resistance can be altered in that the piezoelectric planar oscillator 13 is used to alter the piston diameter, hence forming a shear gradient of smaller amplitude. This is superimposed on the fluid, in particular its speed, which is flowing through the flow-through cross-section 8 as a result of the movement of the piston 3 in the cylinder 2. The flow-through cross-section 8, which can be altered by the planar oscillator 13, and the shear gradient produced by it, can also be controlled by a sound or ultrasonic field. In contrast to the described embodiment, the shear gradient can also be produced by a thickness vibrator as a transverse vibration (that is, in the axial direction). The important point is that, according to the invention, overall shear gradients are produced, depending on amplitude, in the region of marked alterations in the viscosity of the fluid, and that the damping characteristic of the damper element 1 can thus be altered. Inter alia, the invention can be used in connection with the following additional applications: 1. Throttling fluid flow in hydraulic systems, for example in the pre-control of proportional or servo valves; 2. Controllable flow couplings; and 3. Controllable actuators. CLAIMS
1. A device for controlling the flow behaviour of fluids in a flow-through cross-section lying in a velocity field, the device having a means by which oscillations can be generated in the flow-through cross-section, which oscillations are superimposed on the velocity field of the fluid as a velocity gradient of defined amplitude.
2. A device as claimed in claim 1, wherein the means of producing the oscillations in the flow-through cross-section are produced by a sound field or ultrasonic field.
3. A device as claimed in claim 1 or 2, wherein the means for producing the oscillations in the flow-through cross-section are produced by a piezoelectric element.
4. A device as claimed in claim 3, wherein the piezo element forms a planar oscillator or a thickness vibrator.
5. A device as claimed in any of claims 1 to 4, wherein the fluid used is a dilatant fluid whose viscosity increases with the shear gradient.
6. A device as claimed in any of claims 1 to 5, wherein the flow-through cross-section comprises an annular cylindrical aperture disposed between a piston and a cylinder accommodating the piston, whereby radial or axial oscillations can be produced in the flowthrough cross-section.
7. A device as claimed in any of claims 1 to 6, when used in a damper element in a motor vehicle suspension.
8. A device for controlling the flow behaviour of fluids, substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
GB8719303A 1986-08-16 1987-08-14 A device for controlling the flow behaviour of fluids Expired - Lifetime GB2193785B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19863627831 DE3627831C2 (en) 1986-08-16 1986-08-16 Device for influencing the flow behavior of fluids

Publications (3)

Publication Number Publication Date
GB8719303D0 GB8719303D0 (en) 1987-09-23
GB2193785A true GB2193785A (en) 1988-02-17
GB2193785B GB2193785B (en) 1990-03-21

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GB8719303A Expired - Lifetime GB2193785B (en) 1986-08-16 1987-08-14 A device for controlling the flow behaviour of fluids

Country Status (4)

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JP (1) JPS6353328A (en)
DE (1) DE3627831C2 (en)
FR (1) FR2602837B1 (en)
GB (1) GB2193785B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999058874A1 (en) * 1998-05-08 1999-11-18 Carl Schenck Ag Valve on the basis of electrorheological and/or magnetorheological fluids
US7931132B2 (en) * 2006-04-26 2011-04-26 Robert Bosch Gmbh Damper
US7997392B2 (en) 2007-05-21 2011-08-16 Fludicon Gmbh Vibration damper
CN105546020A (en) * 2016-01-07 2016-05-04 南京航空航天大学 Magnetorheological damper with piezoelectric energy recovery function
CN106168265A (en) * 2016-08-11 2016-11-30 张广 A kind of energy based on piezoelectric effect is from supplying magneto-rheological vibration damper
US9662952B2 (en) 2012-12-21 2017-05-30 Hitachi Automotive Systems Europe Gmbh Vibration damper

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10223216B4 (en) * 2002-05-24 2005-10-27 Siemens Ag Device for shock absorption by means of a piezoelectric actuator
DE102008050084B3 (en) * 2008-10-06 2009-11-26 Benteler Automobiltechnik Gmbh High frequency excitation compensating method for telescopic vibration damper of motor vehicle, involves deforming upper piezoelectric actuator against lower piezoelectric actuator, when mechanical force acts on lower actuator

Citations (6)

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Publication number Priority date Publication date Assignee Title
GB1201554A (en) * 1967-01-20 1970-08-12 Vide Sogev Soc Gen Du Improvements in or relating to electro-pneumatic transducers
GB1410312A (en) * 1973-02-06 1975-10-15 Philips Electronic Associated Fluid-control valve
GB1511529A (en) * 1974-08-08 1978-05-24 Union Chimi Continentale Regulating liquid flow
GB2087660A (en) * 1980-10-01 1982-05-26 Daimler Benz Ag Electrically activated control elements
GB2094940A (en) * 1981-02-18 1982-09-22 Nissan Motor Piezo-electric valve
GB2143303A (en) * 1983-07-15 1985-02-06 Lord Corp Fluid control means for vehicle suspension system

Family Cites Families (8)

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US3442501A (en) * 1966-02-25 1969-05-06 Martin Marietta Corp Non-mechanical variable orifice shock absorber
CA983962A (en) * 1972-01-19 1976-02-17 A/S Raufoss Ammunisjonsfabrikker Energy absorber
DE3024601A1 (en) * 1980-06-28 1982-01-21 H. Kuhnke GmbH, 2427 Malente Piezoelectric transducer with signal actuated function - uses electric control signal to switch fluidic pressure flow from one output to another one
GB2111171B (en) * 1981-12-09 1985-07-31 Secr Defence Linear dampers with variable viscosity
JPS59131049A (en) * 1983-01-18 1984-07-27 Toyota Motor Corp Shock absorber
JPS608540A (en) * 1983-06-27 1985-01-17 Nissan Motor Co Ltd Vibration isolating device
DE3330205C2 (en) * 1983-08-20 1986-10-23 Günther 6940 Weinheim Obstfelder Self-regulating shock absorbers, in particular for motor vehicles
DE3433797A1 (en) * 1984-09-14 1986-03-27 Uni-Cardan Ag, 5200 Siegburg Elastic bearing with hydraulic damping

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1201554A (en) * 1967-01-20 1970-08-12 Vide Sogev Soc Gen Du Improvements in or relating to electro-pneumatic transducers
GB1410312A (en) * 1973-02-06 1975-10-15 Philips Electronic Associated Fluid-control valve
GB1511529A (en) * 1974-08-08 1978-05-24 Union Chimi Continentale Regulating liquid flow
GB2087660A (en) * 1980-10-01 1982-05-26 Daimler Benz Ag Electrically activated control elements
GB2094940A (en) * 1981-02-18 1982-09-22 Nissan Motor Piezo-electric valve
GB2143303A (en) * 1983-07-15 1985-02-06 Lord Corp Fluid control means for vehicle suspension system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999058874A1 (en) * 1998-05-08 1999-11-18 Carl Schenck Ag Valve on the basis of electrorheological and/or magnetorheological fluids
US6378558B1 (en) 1998-05-08 2002-04-30 Carl Schenck Valve on the basis of electrorheological and/or magnetorheological fluids
US7931132B2 (en) * 2006-04-26 2011-04-26 Robert Bosch Gmbh Damper
US7997392B2 (en) 2007-05-21 2011-08-16 Fludicon Gmbh Vibration damper
US9662952B2 (en) 2012-12-21 2017-05-30 Hitachi Automotive Systems Europe Gmbh Vibration damper
CN105546020A (en) * 2016-01-07 2016-05-04 南京航空航天大学 Magnetorheological damper with piezoelectric energy recovery function
CN106168265A (en) * 2016-08-11 2016-11-30 张广 A kind of energy based on piezoelectric effect is from supplying magneto-rheological vibration damper

Also Published As

Publication number Publication date
GB8719303D0 (en) 1987-09-23
JPS6353328A (en) 1988-03-07
FR2602837B1 (en) 1990-08-10
GB2193785B (en) 1990-03-21
DE3627831C2 (en) 1997-04-03
DE3627831A1 (en) 1988-02-18
FR2602837A1 (en) 1988-02-19

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Effective date: 19980814