WO2011124559A1 - Amortisseur de choc - Google Patents

Amortisseur de choc Download PDF

Info

Publication number
WO2011124559A1
WO2011124559A1 PCT/EP2011/055230 EP2011055230W WO2011124559A1 WO 2011124559 A1 WO2011124559 A1 WO 2011124559A1 EP 2011055230 W EP2011055230 W EP 2011055230W WO 2011124559 A1 WO2011124559 A1 WO 2011124559A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
damper
shock absorber
centrifugal
absorber according
Prior art date
Application number
PCT/EP2011/055230
Other languages
German (de)
English (en)
Inventor
Dominik Dominik
Original Assignee
Schaeffler Technologies Gmbh & 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 Schaeffler Technologies Gmbh & Co. Kg filed Critical Schaeffler Technologies Gmbh & Co. Kg
Publication of WO2011124559A1 publication Critical patent/WO2011124559A1/fr

Links

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
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
    • 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
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/02—Vibration-dampers; Shock-absorbers with relatively-rotatable friction surfaces that are pressed together
    • F16F7/023—Vibration-dampers; Shock-absorbers with relatively-rotatable friction surfaces that are pressed together and characterised by damping force adjustment means
    • 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
    • F16F2232/00—Nature of movement
    • F16F2232/06—Translation-to-rotary conversion

Definitions

  • the present invention relates to a shock absorber such as that used in automobiles for rapidly decaying the vibrations of sprung masses.
  • an electromagnetic shock absorber in which two damper parts arranged displaceably relative to one another along a damper axis are provided. Between these damper parts damping means are effectively arranged to dampen relative movements of the two damper parts along the damper axis.
  • the one damper part is provided with an electric motor and a ball screw connected to the electric motor.
  • the ball screw has a threaded spindle and a threaded spindle arranged on the spindle nut.
  • the threaded spindle is connected to a rotor of the electric motor for the transmission of torques with the interposition of a torsion bar.
  • the spindle nut is connected to the other damper part.
  • the damper shaft coincides with the axis of the screw shaft and the axis of the rotor. Relative movements of the two damper parts along the damper axis relative to one another are damped in that these relative movements are converted into rotational movements of the threaded spindle for driving the electric motor and thus for generating electricity.
  • the threaded spindle operating here as a drive shaft causes the rotor of the electric motor to rotate, so that an electromagnetic force is induced in the electric motor. This electromagnetic force counteracts the rotation of the threaded spindle and thus leads to a deceleration or damping of the threaded spindle and thus finally to a deceleration of a relative displacement between the two damper parts.
  • the torsion bar connected between the threaded spindle and the rotor delays the transmission of rotational movements of the threaded spindle onto the rotor. This may be advantageous due to the large inertia of the rotor of the electric motor.
  • Object of the present invention was to provide a shock absorber according to the features of the preamble of claim 1, which works flawlessly even under extreme loads.
  • this object has been achieved by the shock absorber according to claim 1.
  • the invention enables the combination of a known electromagnetic shock absorber with a centrifugal brake. This combination enables sufficient additional friction power for further damping even at very high damper speeds.
  • the centrifugal brake may be designed to provide additional damping only when loads on the shock absorber occur outside its intended operating conditions.
  • Shock absorbers used in motor vehicles are operated on bad roads at about 0.25 m / s damper speed. Usual loads of such shock absorbers reach forces of approx. 2500 Newton. These two characteristics can specify in a coordinate system a map within which the shock absorber according to the invention can achieve any desired value without the centrifugal brake. If greater speeds or greater impact forces act on the shock absorber outside of this characteristic field, the centrifugal force can contribute to further damping under the increasing centrifugal force. An overload of the electric motor is thus excluded according to the invention.
  • the two damper parts along a damper axis can be arranged relatively displaceable to each other, wherein a transmission effectively arranged between the two damper parts relative movements of the damper parts along the damper axis in rotation of a drive shaft for the drive of the centrifugal brake converts.
  • centrifugal force deflectable brake elements of the centrifugal brake can be pressed against a brake partner, so that a braking force exerted and as a result a relative movement between the two damper parts are damped.
  • the brake element may, for example, have a plurality of brake parts distributed around a rotation axis, which are pressed against a spring force and under the action of centrifugal force against the brake partner.
  • the brake partner may, for example, be provided on a housing which receives the stator of the electric motor.
  • a ball screw can be used to convert relative displacements between the two damper parts into a rotation in order to drive the rotor of an electric motor.
  • the ball screw can have a threaded spindle and a spindle nut arranged thereon.
  • the spindle nut can be designed here as a drive shaft and be connected to transmit torques to the rotor of the electric motor. Under relative displacement between the two damper parts, the spindle nut rotates, and with it the brake element, which is pressed against the brake partner with a sufficiently large centrifugal force in order to provide a desired friction loss for further damping.
  • the threaded spindle may be assigned to one damper part and the spindle nut to the other damper part, wherein the threaded spindle can be arranged rotationally fixed.
  • this housing may, for example, be provided with a spring plate for mounting a spring, in particular a helical compression spring.
  • the centrifugal brake may be provided with a one-way clutch.
  • the overrunning clutch can be designed such that the centrifugal brake can be activated only in the one direction of rotation, but not in the opposite direction of rotation. With a freewheel clutch different damping rates for the rebound and the compression of the shock absorber at the same damper speeds in the tension and compression direction are achieved.
  • FIG. 1 shows a longitudinal section through a shock absorber according to the invention
  • Figure 2 shows a cross section through the shock absorber according to the invention from Figure 1 and
  • FIG. 3 shows a characteristic diagram of the shock absorber according to the invention.
  • Figure 1 shows a longitudinal section of a shock absorber according to the invention, which is intended for use in a motor vehicle.
  • a lower damper part 1 may be connected to a unsprung wheel carrier, not shown here.
  • the figure shows that this damper part 1 is provided with a spring plate 2 for supporting a not shown here helical compression spring, which is mounted on a further, not shown here spring plate.
  • This further spring plate is mounted on a chassis of the motor vehicle.
  • the shock absorber according to the invention further comprises an upper damper part 3, which may be connected to the chassis, not shown here.
  • the two damper parts 1, 3 are arranged relative to each other along a damper shaft 4 relative to each other.
  • the electric motor 6 has a stator 7 accommodated in the housing 5, as well as a rotor 8 which is rotatable relative to the stator 7.
  • the shock absorber according to the invention is further provided with a ball screw 9.
  • the ball screw 9 has a threaded spindle 10, which is designed in one piece with the upper damper part 3 in the embodiment.
  • a spindle nut 1 1 is arranged, which is fixedly connected to the rotor 8 of the electric motor 6.
  • the spindle nut 1 1 is rotatably mounted in the housing 5 via a ball bearing 12.
  • the rotor 8 is rotatably supported at its end remote from the spindle nut 1 1 via a bearing 12 a in the housing 5.
  • the shock absorber is further provided with a centrifugal brake 13, which is clearly shown in Figure 2 in a cross section in an enlarged view.
  • the centrifugal brake 13 has a brake element 14 which is rotatably arranged with the spindle nut 1 1 and, in the exemplary embodiment, has a brake carrier 15 arranged in a rotationally fixed manner on the spindle nut 1 1 and brake elements 16 distributed around the circumference of the brake carrier 15. On the outer circumference of the brake members 16, a brake pad 17 is attached in each case.
  • the housing 5 encloses the centrifugal brake 13 and is designed as a brake partner 18 for the brake element 14.
  • the housing 5 is provided on its inner circumference with a braking surface 19, with which the brake pads 17 can come into brake contact.
  • the two diametrically arranged on the circumference of the brake carrier 15 Bremstei- le 16 are spring-loaded towards each other and against the brake carrier 15.
  • the operation of the shock absorber according to the invention will be explained below.
  • the threaded spindle 10 and the spindle nut 1 1 are displaced relative to each other along the damper shaft 4, wherein under this Relativverschie- relative rotation between the threaded spindle 10 and the spindle nut 1 1 takes place in a known manner:
  • the spindle nut and the threaded spindle arranged balls roll on helically wound around the spindle axis of the threaded spindle ball grooves, which are formed on the outer circumference of the threaded spindle and the inner circumference of the spindle nut.
  • the spindle nut 1 1 While the threaded spindle 10 is arranged rotationally fixed, the spindle nut 1 1 rotates.
  • the spindle nut 1 1 drives as the drive shaft 21 to the rotor 8 of the electric motor 6.
  • an electromagnetic force is induced in a known manner in the electric motor 6, which counteracts the rotation of the rotor 8, and finally the relative movements between the two damper parts 1, 3 attenuates.
  • the power generated by the electric motor in this way can be fed into the electrical system of the motor vehicle.
  • the centrifugal brake 13 is switched on for further damping. Contrary to the spring force of the springs 20 are under an effective centrifugal force, the brake parts 16 accelerated radially outward with their brake pads 17 and finally get into braking contact with the braking surface 19 of the housing 5. The done by means of the centrifugal brake 13 braking work additionally dampens relative movements between the two damper parts. 1 ; 3. An overload of the electric motor 6 can be prevented with the activated centrifugal brake 13.
  • FIG. 3 shows the characteristic diagram of the shock absorber according to the invention. At the ordinate, the effective forces are applied, which act on the shock absorber along the damper axle. The abscissa represents the damper speed applied, with the two damper parts are shifted to each other.
  • Shown dashed is the characteristic of the shock absorber according to the invention without switched centrifugal brake.
  • the solid line shows the characteristic of the shock absorber according to the invention with a switched centrifugal brake.
  • the electric motor 6 alone can adopt any desired characteristic within the limit damping force F G and the limit damping speed v G with a suitable control. Under a damping force greater than F G , the electric motor could no longer be properly controlled due to a mutual induction and have approximately the dashed characteristic curve.
  • the characteristic follows, for example, the solid line. It can be seen clearly that with a speed increase above v G, the damping force increases progressively. The increase in the damping force is caused by the centrifugal brake, which provides sufficient friction.
  • the centrifugal force grows quadratically with the damper speed, so that sets a progressive course in the provided friction power of the centrifugal brake.
  • the shock absorber according to the invention can be designed such that the centrifugal brake is switched on only in extreme situations in which unusually high damper speeds occur.
  • the shock absorber according to the invention can be designed so that even with bad distances, the required damping is provided exclusively by the electric motor and only when exceeding the limit speed v G, the centrifugal brake is activated.
  • FIG. 3 shows by way of example a damper speed V B to be expected under normal conditions. LIST OF REFERENCES 1 damper part

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

L'invention concerne un amortisseur de choc, comprenant deux parties d'amortisseur (1, 3) disposées de manière à pouvoir coulisser l'une par rapport à l'autre le long d'un axe d'amortisseur (4) et entre lesquelles sont disposés activement des moyens d'amortissement afin d'amortir les mouvements relatifs des deux parties d'amortisseur (1, 3) le long de l'axe d'amortisseur (4). Un frein centrifuge (13) est disposé activement entre les parties d'amortisseur (4), de sorte qu'en cas de dépassement d'une vitesse d'amortissement limite, un amortissement supplémentaire soit fourni par un travail de frottement exécuté par le frein centrifuge.
PCT/EP2011/055230 2010-04-06 2011-04-05 Amortisseur de choc WO2011124559A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010013935.1 2010-04-06
DE201010013935 DE102010013935A1 (de) 2010-04-06 2010-04-06 Stoßdämpfer

Publications (1)

Publication Number Publication Date
WO2011124559A1 true WO2011124559A1 (fr) 2011-10-13

Family

ID=44118895

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/055230 WO2011124559A1 (fr) 2010-04-06 2011-04-05 Amortisseur de choc

Country Status (2)

Country Link
DE (1) DE102010013935A1 (fr)
WO (1) WO2011124559A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103486215A (zh) * 2013-10-16 2014-01-01 成都理工大学 离心转速稳定器
JP2017512290A (ja) * 2014-01-16 2017-05-18 セーフシート アイピー アーベーＳａｆｅｓｅａｔ Ｉｐ Ａｂ エネルギー吸収体

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013004956B4 (de) * 2013-03-22 2016-07-28 Audi Ag Rotationsdämpfer
WO2017009018A2 (fr) * 2015-07-10 2017-01-19 Safeseat Ip Ab Absorbeur d'énergie
DE102015224211A1 (de) 2015-10-15 2017-04-20 Schaeffler Technologies AG & Co. KG Elektromechanischer Aktuator für Kraftfahrzeuge
DE102016216498A1 (de) 2016-09-01 2018-03-01 Schaeffler Technologies AG & Co. KG Stoßdämpfer
DE102016221206B4 (de) 2016-10-27 2018-05-09 Schaeffler Technologies AG & Co. KG Elektromechanischer Fahrwerksaktuator
DE102016223235B4 (de) 2016-11-24 2020-09-24 Schaeffler Technologies AG & Co. KG Aktives Fahrwerkselement

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196796A (en) * 1976-12-17 1980-04-08 Yasutaka Kanamaru Frictional vibration damper
US4346793A (en) * 1979-02-14 1982-08-31 Nhk Spring Co., Ltd. Motion snubbing device
WO2002042659A2 (fr) * 2000-11-27 2002-05-30 Kang Song Doug Amortisseur hybride intelligent
DE60306159T2 (de) 2002-05-29 2006-10-05 Kayaba Industry Co., Ltd. Elektromagnetischer stossdämpfer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196796A (en) * 1976-12-17 1980-04-08 Yasutaka Kanamaru Frictional vibration damper
US4346793A (en) * 1979-02-14 1982-08-31 Nhk Spring Co., Ltd. Motion snubbing device
WO2002042659A2 (fr) * 2000-11-27 2002-05-30 Kang Song Doug Amortisseur hybride intelligent
DE60306159T2 (de) 2002-05-29 2006-10-05 Kayaba Industry Co., Ltd. Elektromagnetischer stossdämpfer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103486215A (zh) * 2013-10-16 2014-01-01 成都理工大学 离心转速稳定器
CN103486215B (zh) * 2013-10-16 2016-04-27 成都理工大学 离心转速稳定器
JP2017512290A (ja) * 2014-01-16 2017-05-18 セーフシート アイピー アーベーＳａｆｅｓｅａｔ Ｉｐ Ａｂ エネルギー吸収体

Also Published As

Publication number Publication date
DE102010013935A1 (de) 2011-10-06

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