WO2012025268A1 - Dispositif de changement de rapport d'une boîte de vitesses de véhicule automobile et tringle de changement de rapport à cet effet - Google Patents

Dispositif de changement de rapport d'une boîte de vitesses de véhicule automobile et tringle de changement de rapport à cet effet Download PDF

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Publication number
WO2012025268A1
WO2012025268A1 PCT/EP2011/058352 EP2011058352W WO2012025268A1 WO 2012025268 A1 WO2012025268 A1 WO 2012025268A1 EP 2011058352 W EP2011058352 W EP 2011058352W WO 2012025268 A1 WO2012025268 A1 WO 2012025268A1
Authority
WO
WIPO (PCT)
Prior art keywords
shift rod
sensor
switching
shift
bearing
Prior art date
Application number
PCT/EP2011/058352
Other languages
German (de)
English (en)
Inventor
Lasse Ibert
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 WO2012025268A1 publication Critical patent/WO2012025268A1/fr

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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
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • 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
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/68—Inputs being a function of gearing status
    • F16H59/70—Inputs being a function of gearing status dependent on the ratio established
    • 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
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/38—Detents
    • 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
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H2063/3079—Shift rod assembly, e.g. supporting, assembly or manufacturing of shift rails or rods; Special details thereof

Definitions

  • the invention relates to a shift rod of a Kraft mecanical tone-senor-senor-senor-senor-senor-senor-senor-senor-senor-senor-senor-senor-senor-senor-senor-senor-senor-senor-senor-senor-senor-senor-senor-senors.
  • the position sensors are formed by two permanent magnets, which are arranged on a common plate and cooperate in a form-fitting manner via a recess with a projection formed on the switching rod.
  • the arrangement of the position sensor is generally carried out so that the position sensors are opposite to the housing fixed in the gear compartment arranged position sensors.
  • the position of the shift rod can be determined.
  • the use of magnets is essential, which serve with the position sensors for detecting the position of the switching element.
  • the use of a magnet involves problems such as temperature-induced measurement inaccuracies or metal abrasion in the transmission, which can hinder the bearing and the frictionless movement of the switching element.
  • DE 20 2004 019 489 A1 shows a sensor unit, which is based on an inductive measuring principle for detecting a position sensor in a sliding-link unit of an automatic transmission.
  • the position transmitter is formed by two rhombuses connected to one another via a web, which encompasses a measuring strip.
  • This arrangement must be arranged directly on the manual shift lever, requires several sensors and can not detect the actually engaged gear, but only the gear selection position such as "D", "R", "P” in the case of manual transmissions.
  • the object of the invention is to provide a simply constructed switching device for a transmission that reliably detects the actually switched gear position.
  • the object of the invention is achieved by a switching device according to claim 1.
  • the shift rod itself is the position sensor for the sensor.
  • no separate component is required, which must be connected to the shift rod and additionally with tolerances in its positioning on the shift shaft is afflicted.
  • the invention also allows a very space-saving solution, as project radially and axially no additional components.
  • the recess is expediently adapted to the shape of the sensor insertable into the recess or of the support receiving the sensor. As a rule, a small, not necessarily constantly wide, gap remains between the two components during the engagement, in order to avoid jamming of the components, for example because of the stresses in the area of the bearing, due to obliquely introduced forces or temperature changes.
  • the gap is small in relation to the recess itself. This ensures that the sensors are guided very close to the shift rod. Since, in many sensors, the signal of the object to be detected is dependent on the distance to the sensor in a quadratic or even higher power, a very accurate position determination can thus be carried out. Particularly suitable is an inductive measuring method.
  • the sensor is preferably arranged on a carrier.
  • a carrier is a circuit board having one or more coils, which may optionally generate an excitation field and / or serve as sensors.
  • the recess in the shift rod in one embodiment, a negative shape of the board cross section, wherein in the switching device between the board and the shift rod always an annular gap of the same width remains.
  • the recess can accommodate, for example, a rectangular slot as a square slot.
  • the exciter field then interacts almost exclusively with the surrounding switching rod and is only insignificantly influenced by other components.
  • the recess of the shift rod is arranged in one embodiment so that it intersects the center of mass of the shift rod in a plane oriented perpendicular to the axial direction. As a rule, it will be arranged symmetrically.
  • the recess may be formed continuously, so connect the two with respect to the switching axis laterally arranged outer surfaces of the shift rod, as well as a blind hole enclose the sensor.
  • the sensor in a bearing of the shift rod. This automatically ensures the correct positioning of the sensor to the bearing and thus to the shift rod. Furthermore, it is possible to seal the bearing with respect to the transmission, so that no metal particles can penetrate, which can degrade the sensor properties. Furthermore, the bearing at the same time a gearbox fixed housing available, so that the power supply and the signal output to a gear external gear recognition unit can be done very easily.
  • the position between the sensor and the shift rod is already clearly defined during assembly of both components. In particular, the positioning of the two components relative to one another is already achieved before installation of the bearing unit in a transmission. Ideally, in this case the bearing unit and the measuring sensor are integrated in a common housing, so that the module can be incorporated as a module in the transmission. The customer is thereby considerably easier to assemble.
  • the contactlessly operating sensor as an eddy current sensor.
  • the principle of eddy current measurement is based on the detection of the retroactivity of eddy currents.
  • eddy currents are induced by a changing magnetic field in an electrical conductor, which in turn counteracts the build-up of one of the effect cause a directed magnetic field.
  • the switching element moves between two positions, each corresponding to a switching position.
  • the eddy-current sensor thus has to detect the two positions of the switching element.
  • the generation of a constant magnetic field, with respect to which the switching element changes its position is sufficient.
  • an alternating magnetic field is generated by the eddy current sensor, which is weakened when a conductive measuring element or target is in the vicinity.
  • eddy currents are generated by the alternating field, which weaken the magnetic field. This attenuation is measurable and dependent on the distance between the eddy current sensor and the target.
  • the alternating magnetic field can be generated by means of an electromagnetic resonant circuit. This is deprived of measurable energy by the weakening of the magnetic field.
  • the switching rod may have a round outer contour, but it may also be punched, for example, made of flat material, be square in cross-section.
  • the switching device can also be realized with a switching shaft.
  • a trained as a shift rail shift rod is hereby usually made of a metallic material see. In this respect, such a metallic shift rod can be used directly and without further aids as a target for the eddy current sensor.
  • the shift rod is made of steel, is therefore very robust and can even be used as a measuring element. Due to the design of the switching element as a measuring element, the bearing assembly simplifies considerably, and also the production costs can be reduced. The assembly effort is not undesirable by attaching and positioning a separate measuring element difficult. Also, the space requirement can be kept low.
  • the bearing unit is preferably designed with a roller bearing.
  • Rolling bearings usually have a number of grooves in which rolling elements are guided.
  • the rolling elements run, for example, on the inside on a rail mounted on an inner plate and on the outside in a circular cylindrical sleeve, which is inserted in a geared bore.
  • Such rolling bearings allow good efficiencies due to a low bearing friction and thus increase the shifting comfort, since they can provide a very smooth longitudinal guidance of a shifting element.
  • a sliding bearing of a switching element is conceivable.
  • Plain bearings are usually made of plastic and allow at low cost exact guidance of the switching element.
  • plastic bearings have the advantage of an acoustic damping of the switching operation.
  • Figure 1 shows a three-dimensional view of a bearing assembly
  • FIG. 2 shows a schematic bearing arrangement with a bearing unit, a
  • Figure 3 shows a bearing assembly according to the prior art
  • Figure 4 is a perspective view of an inventive
  • FIGS 1 and 2 show a switching device 2 with a Lagerund 8 of a linearly displaceable Getriebestellelements 3.
  • the switching device 2 is part of a non-illustrated transmission housing 6 of a motor vehicle. It comprises a shift rod 4 as a transmission actuating element 3 and the bearing 8, which is received in a bearing sleeve 10.
  • the bearing sleeve 10 is pot-shaped and has a bottom 13 oriented in the direction of the shift rod 4.
  • the shift rod 4 is mounted with an axial end 16 with a rolling bearing 18.
  • the not visible in Figure 1 second axial end of the shift rod 4 is mounted in a further rolling bearing.
  • the rolling elements 19 of the radial-linear roller bearing 18 run on the lateral surface 20 of the bearing sleeve 10 inside. From the cross-sectional view of both sides of the longitudinal axis 15 symmetrical arrangement of the rolling elements 19 is not apparent.
  • the lateral surface 20 of the bearing sleeve 10 is made of a high-strength steel.
  • the bearing sleeve 10 itself is inserted into a cylindrical housing portion of the housing 6.
  • a sensor 12 is arranged on the bottom 13 of the bearing sleeve 10. It is arranged opposite to the end face 7 of the axial end 16 of the shift rod 4.
  • a recess 9 is arranged, into which a sensor 12 held in the base 13 engages.
  • the sensor 12 and the recess 9 are both arranged substantially along the longitudinal axis 15 of the shift rod 4. The assembly process is simple because it does not depend on the exact mounting position of the sensor 12 and the shift rod 4 due to a subsequent calibration process.
  • the shift rod 4 is displaced along its longitudinal axis 15 between three axially adjacent positions si, s n , s 2 (FIG. 2).
  • the middle position corresponds to the neutral position s n
  • the two other positions si, S2 are shift positions and are each assigned to a gear.
  • shift finger is moved between these positions.
  • the shift rod 4 in the gearbox from the neutral position s n out is moved to the switching position.
  • the circuit of the gear set required to form the corresponding gear ratio step via the shift finger and a shift sleeve attached thereto, the circuit of the gear set required to form the corresponding gear ratio step.
  • the sensor 12 By means of the sensor 12, a determination of the axial position of the shift rod 4 is possible.
  • the measured value correlated with the neutral position si, s n , s 2 of the shift rod 4 is chosen as a reference, so that the arrangement is calibrated with respect to the neutral position.
  • the sensor signals generated by the sensor 12 change.
  • the corresponding voltage signal is picked up by the signal receiver 21 and is transmitted via the plug contact 22 to an external evaluation unit 11, which optionally corrects this value by external influencing variables of a further sensor 17.
  • Figure 3 shows a prior art switching device 2 which is easily modified to benefit from the invention (Figure 4).
  • a molding 23 made of plastic guides the shift rod 4.
  • the shift rod 4 is received in the molding 23 by a blind hole 14.
  • the switching device 2 thus formed can be delivered as a preassembled module for gearbox mounting.
  • a spring locks as a latching element 1.
  • the shift rod 4 has a plurality of recesses 5 in a 90 ° offset longitudinal section, which together form a latching contour for the latching element 1.
  • the locking element 1 is formed as a shaped spring in horseshoe shape and has a base 27 and two legs 28 which are opposite to each other with respect to the shift rod 4, on. The distance of the legs 28 from each other and the width of the legs 28 increases toward the base 27, wherein the material thickness of the spring is constant.
  • the molding 23 itself forms a bearing sleeve 10.
  • a groove 14 is inserted for receiving the spring, wherein the width of the groove on the base 27 is only slightly wider than the spring and thigh side widens according to the permissible spring travel. This ensures that the spring is always optimally guided, can not tilt and is well supported.
  • the recess 9 in FIG. 4 receives the sensor 12 arranged on a flat circuit board 24.
  • the sensor may be formed as one or more coils.
  • 24 excitation coils 25 may be arranged on the board.
  • the exciter coil 25 generates a magnetic alternating field via an electromagnetic resonant circuit. This field is weakened by the shift rod 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)
  • Gear-Shifting Mechanisms (AREA)

Abstract

L'invention concerne un dispositif de changement de rapport (2) d'une boîte de vitesses à engrenage de véhicule automobile comprenant une tringle de changement de rapport (4) qui peut coulisser dans le sens axial dans plusieurs positions de changement de rapport (s1, s2, sn), un palier (8) pour la tringle de changement de rapport et un capteur (12). Selon l'invention, la tringle de changement de rapport (4) présente sur au moins un coté frontal axial (7) un évidement (9) dans lequel le capteur (12) vient en prise dans au moins une position de changement de rapport (s1, s2, sn).
PCT/EP2011/058352 2010-08-24 2011-05-23 Dispositif de changement de rapport d'une boîte de vitesses de véhicule automobile et tringle de changement de rapport à cet effet WO2012025268A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010035187.3 2010-08-24
DE201010035187 DE102010035187A1 (de) 2010-08-24 2010-08-24 Schaltstange eines Kraftfahrzeuggetriebes

Publications (1)

Publication Number Publication Date
WO2012025268A1 true WO2012025268A1 (fr) 2012-03-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/058352 WO2012025268A1 (fr) 2010-08-24 2011-05-23 Dispositif de changement de rapport d'une boîte de vitesses de véhicule automobile et tringle de changement de rapport à cet effet

Country Status (2)

Country Link
DE (1) DE102010035187A1 (fr)
WO (1) WO2012025268A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015212137A1 (de) 2015-06-30 2017-01-05 Schaeffler Technologies AG & Co. KG Schaltdom für ein Schaltgetriebe eines Kraftfahrzeuges

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6228222U (fr) * 1985-08-02 1987-02-20
JPH04171359A (ja) * 1990-11-02 1992-06-18 Jidosha Kiki Co Ltd 変速機操作装置
DE19615273A1 (de) * 1996-04-18 1997-10-23 Getrag Getriebe Zahnrad Kardangelenk
EP1548333A1 (fr) * 2003-11-28 2005-06-29 INA-Schaeffler KG Dispositif avec fluide de changement de vitesses d'une transmission
JP2005180507A (ja) * 2003-12-17 2005-07-07 Nsk Ltd 自動変速機用アクチュエータ
DE102007032972A1 (de) * 2007-07-16 2009-01-29 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Messvorrichtung und Verfahren zur Erfassung einer axialen Verschiebung einer Welle

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202004019489U1 (de) 2004-12-17 2005-05-25 Cherry Gmbh Induktive Sensoreinheit
DE102006028785B3 (de) 2006-06-23 2007-04-12 Audi Ag Anordnung von Positionsgebern an einer Schaltstange

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6228222U (fr) * 1985-08-02 1987-02-20
JPH04171359A (ja) * 1990-11-02 1992-06-18 Jidosha Kiki Co Ltd 変速機操作装置
DE19615273A1 (de) * 1996-04-18 1997-10-23 Getrag Getriebe Zahnrad Kardangelenk
EP1548333A1 (fr) * 2003-11-28 2005-06-29 INA-Schaeffler KG Dispositif avec fluide de changement de vitesses d'une transmission
JP2005180507A (ja) * 2003-12-17 2005-07-07 Nsk Ltd 自動変速機用アクチュエータ
DE102007032972A1 (de) * 2007-07-16 2009-01-29 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Messvorrichtung und Verfahren zur Erfassung einer axialen Verschiebung einer Welle

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Publication number Publication date
DE102010035187A1 (de) 2012-03-01

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