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
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H61/26—Generation or transmission of movements for final actuating mechanisms
  • F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
  • F16H61/32—Electric motors actuators or related electrical control means therefor
• • 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
  • F16H63/08—Multiple final output mechanisms being moved by a single common final actuating mechanism
  • F16H63/16—Multiple final output mechanisms being moved by a single common final actuating mechanism the final output mechanisms being successively actuated by progressive movement of the final actuating mechanism
  • F16H63/18—Multiple final output mechanisms being moved by a single common final actuating mechanism the final output mechanisms being successively actuated by progressive movement of the final actuating mechanism the final actuating mechanism comprising cams
• • 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
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H2061/0053—Initializing the parameters of the controller
• • 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
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H61/26—Generation or transmission of movements for final actuating mechanisms
  • F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
  • F16H2061/283—Adjustment or calibration of actuator positions, e.g. neutral position
• • 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
  • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
  • F16H61/26—Generation or transmission of movements for final actuating mechanisms
  • F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
  • F16H2061/2846—Arrangements of actuators for enabling jump shifting for skipping of gear ratios

Definitions

• a gearbox comprises a shaft on which free sprockets are mounted. This shaft is referred to as a secondary shaft, as opposed to the primary shaft that carries fixed gears. Each free gear defines with a fixed gear a gear ratio.
• the free sprockets are freely rotatable vis-à-vis the corresponding secondary shaft except when a clutch and a synchronizer come to secure one of the pinions with the shaft to engage the corresponding gear ratio.
• the synchronizer is currently actuated by a fork movable in translation.
• the assembly formed by the claws, the synchronizer and the fork is a means of coupling the shaft and pinion.
• the translation movement of the fork is given to it, in the systems which interest us here, by a control cylinder movable in rotation.
• the transformation of the rotation of the barrel in translation of the fork is performed using a track carried by the barrel, which is oriented to produce a cam effect (or ramp effect).
• the invention aims to solve these problems and proposes a gearbox for a motor vehicle comprising at least one coupling means for coupling a shaft to a pinion mounted around said shaft, said coupling means being movable in translation, a cylinder rotational control device for controlling the translation of said coupling means means for monitoring the angular displacement of the barrel, means for ascertaining whether the control barrel is at a predetermined angular position to initialize said tracking means, and means for controlling a rotation of the barrel until the fact that the barrel is at said predetermined angular position, characterized in that the box further comprises means for disengaging the coupling means of the barrel at least during the implementation of said means for controlling a rotation of the barrel until the observation that the barrel is at said predefined angular position completed and re-engage said coupling means in the barrel for engaging a gear ratio.
• the means for determining whether the control cylinder is at a predetermined angular position comprises an on-off sensor and a witness placed on a section of the barrel, the all-or-nothing sensor identifying the witness.
• the box may further comprise an electric motor for controlling the rotation of the barrel, the means for monitoring the angular displacement of the barrel comprising a sensor for monitoring the angular displacement of the barrel placed in the electric control motor.
• the means for controlling a rotation of the barrel until the observation that the barrel is at said predetermined angular position can control a rotation in one direction and then in opposite direction to find twice the fact that barrel is at said position predetermined angle so as to increase the accuracy of the finding.
• the box is configured to control the rotation of the barrel. to an initial position at which the coupling means is again engaged in the barrel.
• said means for disengaging the barrel coupling means may comprise retractable nipples on order interacting, when they are not retracted, with a control track present on the surface of the barrel, and a control unit for order their retraction before initialization or replacement after initialization.
• the invention also consists in a method of initializing an angular displacement tracking of a gearbox control cylinder for a motor vehicle, the box comprising at least one coupling means for coupling a shaft to a gearbox. pinion mounted around said shaft, said coupling means being movable in translation, said cylinder being movable in rotation to control the translation of said coupling means by means of a control track present on the surface of the cylinder, characterized in that the method comprising disengaging the barrel coupling means followed by a rotation control of the barrel until the fact that the barrel is at a predetermined angular position, to initialize said tracking, and subsequently, a reengagement of the means of coupling in the barrel to engage at least one gear ratio.
• the invention also provides a computer program, which when implemented by a processor leads to the implementation of the steps of the method according to the invention.
• FIG. 2 shows a coupling system of the shaft and sprockets of a gearbox comprising a control cylinder
• FIG. 3 shows the coupling system of the shaft and sprockets of a gearbox comprising a barrel, according to one embodiment of the invention.
• FIG. 1 shows an aspect of an embodiment of the invention.
• a control cylinder 100 of a motor vehicle gearbox It is a generally cylindrical piece, of circular section and axis XX, and whose outer circumferential surface carries tracks, here three in number, referenced 1 10, 120 and 130.
• These tracks which may have a U-shaped profile, are for example the result of a machining of the barrel material, and extend generally over a circumference thereof. They consist of different sections succeeding each other on successive angular sectors. Some sections extend in a plane perpendicular to the axis of the barrel, while other sections (ramps) extend in a plane inclined relative to the axis of the barrel.
• the cylinder 100 may be driven, relative to the housing of the gearbox, a rotational movement R about the axis XX, due to the action of an electric motor, for example.
• Each of the tracks 1 10, 120, 130 then constitutes a guide for a corresponding fork actuation nipple (or control stick).
• the forks are not shown in FIG. 1, but there is a distinction between the stud 21 1 which is guided in the track 1 10, the stud 221 which is guided in the track 120 and the stud 231 which is guided in the track 130.
• the barrel 100 could order only two forks, or, on the contrary, order a greater number of forks.
• the barrel serves to control a sequence of gear shifts.
• the section 1 1 1 is a section in a plane inclined relative to the axis of rotation of the cylinder 100, and the guide pin 21 1 in this section 1 10 in rotation imposes, by a cam effect (ramp effect) , a translation relative to the housing of the gearbox in a direction T parallel to the axis XX, the pin 21 1 and the fork that it controls.
• the stud 221 is guided by the track 120.
• Three sections 121, 122 and 123 of the track 120 are visible in Figure 1.
• the rotation of the barrel 100 brings successively the pin 221 in each of these sections of the track 120.
• the sections 121 and 123 being in two planes perpendicular to the axis of rotation of the cylinder 100, when the pin 221 is in one or the other of these sections, the rotation of the barrel 100 does not impose any translation movement.
• the section 122 being in a plane inclined relative to the axis of rotation of the cylinder 100, by a camming effect, when the pin 221 is in the section 122, the rotation of the cylinder 100 causes a translation of the nipple 221.
• a barrel 100 with two tracks is shown. It has also included the ranges it controls, and the pinions finally coupled to the shaft by the action of the control cylinder.
• a first track on the barrel 100 consisting of a section 1 1 1 inducing a cam effect and a section 1 12 does not induce camming effect.
• a second track comprising a camming section 122 and a non-camming section 121.
• the pins 261 and 262 are guided by the two tracks, respectively. They control forks 213 and 223, respectively via fork axes 212 and 222.
• the fork axes 212 and 222 are elongated parts parallel to the axis X-X of rotation of the cylinder and on which are fixed at a distance from each other the corresponding nipple, and the corresponding fork beaks.
• Each of the forks 213 and 223 comprises two nozzles whose ends are axial bearing faces for acting by a support in a direction parallel to the axis X-X on synchronization sleeves of a synchronizer 320, 420 respectively.
• Synchronizers 320 and 420 have the function of coupling, or decoupling, gears 310, 31 1 or respectively 410, 41 1 defining gear ratios, with a secondary shaft 1000 of the gearbox.
• the shaft 1000 of the gearbox is parallel to the axis X-X of rotation of the cylinder 100, and also to the axis of the fork 212, 222 respectively.
• a rotational movement R of the barrel 100 around its axis of rotation XX causes, when a stud is engaged in a camming section of the corresponding track, a translation T of the corresponding fork, the actuation (or one of the two) synchronizer (s) that it controls and the engagement of a gear ratio. It is specified that the barrel 100 shown is able to control two forks and that the invention naturally applies to a cylinder that can control another number of ranges
• the nipple 261 (or retractable control stick, or else blasting), acting in a direction perpendicular to the fork axis 212, has an end (its ball) which is inserted into the corresponding track of the cylinder 100 and maintained against it by a compression spring of the stud 261.
• the stud 261 couples in motion the barrel 100 and the fork 213. In addition it maintains in position the fork 213 and its axis 212, by contact with the walls of the track of the barrel 100.
• the spring of the stud 261 can be controlled so that the entire pin 261 disappears, uncoupling the barrel 100 and the fork 213, the movements of one then causing more movement of the other. To achieve this result, the ball is retracted, to no longer ensure contact with the barrel.
• the fork axis 222 carries, in the same way, a stud 262 which inserts its end into the corresponding track of the barrel 100 and couples in motion the barrel and the fork 223.
• the stud 262 also acts to maintain in position the fork 223 and its axis 222, by contact with the walls of the track of the barrel 100.
• the ball of the stud 262 can also be retracted, to no longer ensure contact with the barrel.
• the studs 261 and 262 are controlled respectively by control means 271 and 272 which can control the retraction (or erasure) of the corresponding shot.
• Such a retraction causes the disengagement of the corresponding fork (or disconnection of the fork vis-à-vis the barrel) and the lack of transformation of any rotational movement of the barrel into a rotational movement of the range (the gear ratio controlled by the fork is thus not engaged or disengaged), as well as the absence of any friction between the barrel and the elements of the fork (its pin) stabilizing it.
• the gearbox according to the invention further comprises stabilization systems 550 and 500 (or stabilization means), mounted to stabilize the sets of compounds on the one hand of the stud 261, of axis 212 and the fork 213, and secondly the stud 262, the axis 222 and the fork 223, when the billing 261 or 262 corresponding is retracted.
• stabilization systems 550 and 500 or stabilization means
• Such a stabilization system has the effect of reducing the possibilities of movement of the assembly formed by the stud 262, the axis 222 and the fork 223, including when the blasting 262 is retracted. It may include spring blasting.
• the stabilization system 500 is free in rotation vis-à-vis the cylinder, and acts for example by relying on the housing 520 of the gearbox or on an element attached to the housing 520 , or kinematically equivalent to the housing.
• a controlled stabilization system can be used, and it is then expected that it disappears when the fork 223 must be moved to engage the corresponding gear ratio.
• the stabilization system 500 is coordinated with the rotation control of the cylinder 100 to stabilize the fork 223 when the latter is disengaged from the cylinder and not stabilize it when it is moved to engage a gear ratio.
• the stabilization system 500 is shown in the figure, applied to stabilize the range 223 because the blasting 262 is disengaged from the corresponding barrel track, and the stabilization system 550 is shown cleared (retracted) because the blasting 261 is engaged in the corresponding track.
• the forks may have the arrangement shown in Figure 3 around the cylinder 100, shown in a plane perpendicular to its axis.
• the pins 261, 262 and 263 are arranged in distinct angular sectors and distant from each other around the barrel.
• the forks 213 and 223, which are driven by the pins 261 and 262 act on free sprockets cooperating with the shaft 1000, while the fork 233, driven by the blasting 263 acts on free sprockets cooperating with the shaft 1001.
• the forks 213 and 223 are offset relative to one another angularly around the shaft 1000.
• nipples 261, 262 and 263 are retractable as has been presented in connection with Figure 2.
• the cylinder 100 is rotated by a cylinder control motor 600, which comprises a sensor 610 for monitoring the angular displacement of the cylinder, which measures continuous way the angular displacement, and increment continuously, accordingly, the contents of a memory 910.
• a cylinder control motor 600 which comprises a sensor 610 for monitoring the angular displacement of the cylinder, which measures continuous way the angular displacement, and increment continuously, accordingly, the contents of a memory 910.
• the barrel 100 carries on its circumference, in a given angular sector, a witness 700 for a sensor, for example for an optical sensor.
• the gearbox comprises, fixed relative to the housing of the box, an on-off sensor 800, for example an optical sensor, configured to detect the presence or passage of the indicator 700 in an angular position about the axis of rotation.
• the sensor 800 is placed to locate a reference position ⁇ 0 of the cylinder 100 defined relative to the housing.
• the gearbox further comprises a central unit 900 (or processor) to see if the sensor 800 indicates that the control cylinder 100 is at the angular position indicated by the control 700, and then initialize the tracking of the angular displacement of the cylinder 100 which is performed by the sensor 610 for monitoring the continuous angular displacement, by initializing the contents of the memory 910.
• a central unit 900 or processor
• the central unit 900 is also configured to control, during initialization of the continuous angular tracking, a rotation of the barrel 100 to the observation that the barrel is at the angular position identified by the witness 700.
• the central unit 900 is also configured to control the rotation of the barrel 100 to engage the gear ratios requested by the driver, once the rotation tracking initialized.
• Figure 4 there is shown a method of implementation of the invention.
• the invention must be implemented after the motor vehicle has been stopped, that the engine has for example been cut, and that the position of the barrel was lost by loss of the information contained in the memory 910. These events are presented as step 1.
• the driver wishing to restart and engage a gear ratio the initialization of the rotational tracking of the barrel 100 is controlled. It is started by the disengagement of the forks 213, 223 and 233 vis-à-vis the barrel 100, during a step 2.
• the reference position ⁇ 0 identified by the sensor 800 is searched.
• the cylinder 100 is rotated by the engine 600 until the sensor 800 detects the marker 700 in front of it.
• the sensor 610 measures the displacement and records the value of the angular displacement ⁇ followed since the disengagement of the forks 213, 223 and 233 and the barrel 100.
• step 3 is followed by a step 4 during which a reverse rotation is applied to the cylinder 100 by the engine 600.
• the sensor 800 detects again the marker 700 opposite it when passing in the opposite direction.
• a rotation of an angular displacement value for example - ⁇ is applied to return to the location at which the forks and the barrel have been disengaged.
• the forks 213, 223 and 233 and the barrel 100 are then reengaged.
• the memory 910 is initialized on the basis of the two detections of the indicator 700 by the sensor 800.
• the driver can then engage a gear ratio.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Gear-Shifting Mechanisms (AREA)

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• 2014
  • 2014-08-05 FR FR1457599A patent/FR3024760B1/fr not_active Expired - Fee Related
• 2015
  • 2015-07-10 EP EP15753102.1A patent/EP3177856A1/de not_active Withdrawn
  • 2015-07-10 WO PCT/FR2015/051916 patent/WO2016020590A1/fr active Application Filing

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