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
  • F16H61/30—Hydraulic or pneumatic motors or related fluid 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
  • F16H63/30—Constructional features of the final output mechanisms
  • F16H63/34—Locking or disabling mechanisms
  • F16H63/3416—Parking lock mechanisms or brakes in the transmission
  • F16H63/3483—Parking lock mechanisms or brakes in the transmission with hydraulic actuating 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
  • 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
  • F16H63/40—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 comprising signals other than signals for actuating the final output mechanisms
  • F16H63/48—Signals to a parking brake or parking lock; Control of parking locks or brakes being part of the transmission
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T74/00—Machine element or mechanism
  • Y10T74/20—Control lever and linkage systems
  • Y10T74/20012—Multiple controlled elements
  • Y10T74/20018—Transmission control
  • Y10T74/20024—Fluid actuator
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T74/00—Machine element or mechanism
  • Y10T74/20—Control lever and linkage systems
  • Y10T74/20012—Multiple controlled elements
  • Y10T74/20018—Transmission control
  • Y10T74/20085—Restriction of shift, gear selection, or gear engagement

Definitions

• the invention relates to a switching device according to the preamble of claim 1.
• the invention is in particular the object of providing a switching device which is particularly flexible and has a high reliability. It is achieved according to the invention by the features of claim 1. Further embodiments emerge from the subclaims and additional claims.
• the invention relates to a switching device of a motor vehicle, in particular a parking lock switching device, with at least one hydraulic switching unit.
• the switching unit is designed for a drive unit designed separately from an internal combustion engine.
• a “drive unit” should be understood to mean, in particular, a unit which is provided to provide a drive power for generating a switching pressure required for a switching operation.
• “Designed” is understood to mean that the switching unit has, in particular, its hydraulic active surfaces, an envisaged energy store , such as a switching spring, and / or by a pressure generating means, in particular by a pump, is designed to the switching pressure which can be generated by the separate from the internal combustion engine drive unit, wherein a maximum power of the Internal combustion engine trained drive unit in particular is smaller than that of the internal combustion engine.
• a switching operation such as preferably a parking lock switching device, can be ensured even in the case of a defective or non-activatable internal combustion engine, whereby high reliability can be ensured.
• the switching unit is designed for a drive unit formed by a starter generator, additional installation space, weight and costs can be at least largely avoided.
• the switching unit is preferably designed such that even at a starter speed of the internal combustion engine, a required switching pressure can be established.
• a "starter generator” is to be understood as meaning, in particular, a drive unit which is specially provided for starting an internal combustion engine, that is to say in particular for cranking an internal combustion engine during a starting operation.
• the switching device preferably comprises the drive unit, which is formed separately from the internal combustion engine and is provided for providing a drive power for generating a switching pressure required for a switching operation of the switching unit, whereby an advantageous tuning of an overall unit resulting from the switching unit and the drive unit can be achieved.
• the drive unit is formed by an electric machine, whereby this can be structurally simple and inexpensive integrated.
• the drive unit in addition to the function of the construction of the switching pressure on at least one other function, which is particularly easy to implement when the drive unit is formed by an electrical unit, additional components, space, weight and cost can be saved.
• Particularly suitable as additional functions are to provide a drive power for generating a coolant volume flow and / or a drive power for generating a hydraulic pressure during a start-stop operation, etc.
• the electric drive unit is formed by a starter generator, which has as an additional function to provide a drive power for driving an internal combustion engine during a starting operation.
• the switching unit has a locking unit, in particular with at least two locking positions, whereby undesired circuits are structurally simple, at least largely avoided.
• locking positions are to be understood as meaning, in particular, various shift positions in which a lock exists.
• the locking unit can be pushed over by means of the switching unit in at least one switching direction, a function can be at least largely ensured even if the locking unit is defective.
• the locking unit is overwhelmed by means of the switching unit only in a single switching direction, and particularly advantageous for inserting a parking position, whereby the switching of a switching position and holding this switching position, preferably the parking position, can be achieved with high security.
• the switching unit has a double-acting hydraulic actuator, whereby a switching operation is preferably initiated hydraulically in two directions and thus a high reliability can be achieved.
• the switching unit comprises a hydraulic actuator which has at least two separate pressure surfaces in at least one switching direction.
• the term "separated” should be understood to mean, in particular, that the pressure surfaces are spatially separated from one another by a free space.
• the switching device has a control unit which is intended to automatically switch at least one valve, an increased switching safety can be achieved, in particular if the control unit is intended to supply the valve before a switching operation and in particular before a starting process of an internal combustion engine activate, so that during a subsequent switching operation, in particular a layout of a parking position, the valve can be deactivated by an operator.
• Fig. 1 is a schematically illustrated motor vehicle device with a
• FIG. 1 shows a schematically illustrated motor vehicle device with an internal combustion engine 12 and with a switching device according to the invention designed as a shift-by-wire system, namely a parking lock switching device having a hydraulic switching unit 10 which is formed on a separate from the internal combustion engine 12 drive unit 14 of Switching device is designed.
• the driving unit 14 of the shifting apparatus is constituted by an electric machine, namely, a starter generator provided to rotate the engine 12 at a starting operation thereof and is also provided with a driving power for generating a shifting unit 10 required to shift To provide switching pressure.
• the drive unit 14 is coupled via the internal combustion engine 12 in terms of drive technology with a pump 36 of the switching unit 10, whereby standard components can be advantageously used.
• the drive unit 14 is coupled directly to the internal combustion engine 12 and directly to the pump 36, as indicated by dashed lines in FIG.
• a pump is provided which is coupled to the drive unit 14 and decoupled from the internal combustion engine 12 and which is intended to build up a corresponding switching pressure.
• the switching unit 10 includes a coupled to the pump 36, formed by a 4/2-way solenoid valve 38 and a double-acting hydraulic actuator 22 which has two separate pressure surfaces 28, 30, 32, 34 in two switching directions 24, respectively.
• the actuator 22 has in an actuator cylinder housing 40, two axially spaced pistons 42, 44 which are secured to a common piston rod 46 and are spatially separated by a stationary cylinder intermediate wall 48.
• the switching unit 10 comprises a locking unit 16 having two locking positions 18, 20 corresponding to two switching positions, with a lock position associated with a locking position 18 and a drive position associated locking position 20.
• the locking unit 16 includes a valve formed by an electromagnet 50, the engages in the locking positions 18, 20 in recesses of the piston rod 46 and fixed.
• Figure 1 shows the switching device in a parking position.
• the valve 38 is automatically activated by a control unit 74 of the switching device, so that the same by means of its electromagnet against a spring force of its valve spring in one of the park position associated end position ( Figure 1) is moved, the lifter 50 remains deactivated and so that it remains in its locked position.
• the pusher 50 is designed in such a way that the parking position can be designed only when it is activated, so that even with a wrongly switched valve 38 can be ensured that an undesirable layout of the parking position is avoided.
• the same is rotated about 200 to 300 rpm by means of the drive unit 14.
• the pump 36 is driven, wherein already applied alone by the drive unit 14 drive power at a starting operation of the internal combustion engine 12 is sufficient to build up by means of the pump 36, a sufficient oil pressure to switch the switching device from its parking position to its driving position ( Figure 2). It can thus be switched in a non-bootable internal combustion engine 12, the switching device.
• valve 38 and the valve slide 50 are electrically actuated by an operator, namely the solenoid of the valve 38 is deactivated, so that the valve 38 by means of the spring force of its valve spring from its parking position associated end position (FIG 1) in its driving position associated end position ( Figure 2) is moved and the lifter 50 is temporarily moved from its locked position to its Endperr ein and the piston rod 46 releases.
• the driving position associated end position of the valve 38 hydraulic fluid in the pressure surfaces 28, 30 of the piston 42, 44 directed pressure chambers, so that the pistons 42, 44 together with the piston rod 46 against a spring force of an actuator spring 52 in the switching direction 26 of its parking position be moved into their driving position.
• a corresponding displacement is sensed by means of a position sensor unit 66.
• Hydraulic fluid in a pressure chamber 32 facing the pressure chamber flows at a corresponding displacement of the piston 42, 44, via a line 54 into a tank 56 and hydraulic fluid in a pressure surface 34 facing the pressure chamber flows via a line 58 and the valve 38 in a tank 60th from.
• the same are connected via two check valves 62, 64 with a tank, not shown.
• the piston rod 46 is connected to a pawl, not shown, which is released at a displacement of the piston 42, 44 and the piston rod 46 in its driving position.
• a pawl not shown
• Concrete driving positions R, N, D are set via a piston-cylinder unit, not shown.
• valve 38 and the slide valve 50 are electrically actuated by an operator, namely the solenoid of the valve 38 is activated, so that the valve 38 against the spring force of its valve spring from its driving position associated end position ( Figure 2) 1 is displaced and the pusher 50 is momentarily displaced from its blocking position into its end blocking position and releases the piston rod 46.
• hydraulic fluid is introduced into the pressure chamber facing the pressure surface 34 of the piston 44 guided, so that the pistons 42, 44 together with the piston rod 46 supported by the spring force of the actuator spring 52 are shifted in the switching direction 24 from its driving position to its parking position. If there is no hydraulic pressure, but the lifter 50 is switched, the pistons 42, 44 moved together with the piston rod 46 alone in the park position by the spring force of the actuator spring 52.
• the locking unit 16 is designed in such a way that it can be hydraulically suppressed in defective lifter 50 to engage the parking position. However, over-pressing of the locking unit 16 solely by the spring force of the actuator spring 52 is excluded.
• Hydraulic fluid in the pressure surfaces 28, 30 facing pressure chambers flows at a corresponding displacement of the piston 42, 44 via lines 68, 70, 72 and via the valve 38 into the tank 60 from.
• the pawl connected to the piston rod 46 When inserting the parking position, the pawl connected to the piston rod 46 is moved to its blocking position. In the parking position of the lifting slide 50 engages in the parking position associated with the recess of the piston rod 46 and secures the switching device in its parked position.
• a separate power source in the form of an additional battery is provided in order to achieve a high degree of safety that the parking position can be engaged.

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

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Citations (8)

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• 2008
  • 2008-02-29 DE DE102008011898A patent/DE102008011898A1/de not_active Withdrawn
• 2009
  • 2009-02-20 JP JP2010548005A patent/JP2011513659A/ja active Pending
  • 2009-02-20 EP EP09715433.0A patent/EP2247875B1/de active Active
  • 2009-02-20 CN CN200980106894.XA patent/CN101960183B/zh active Active
  • 2009-02-20 WO PCT/EP2009/001248 patent/WO2009106271A1/de not_active Ceased
• 2010
  • 2010-08-18 US US12/806,676 patent/US8667859B2/en active Active

Patent Citations (8)

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