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
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
  • F16D23/12—Mechanical clutch-actuating mechanisms arranged outside the clutch as such
• • 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
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D28/00—Electrically-actuated clutches
• • 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
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
  • F16D23/12—Mechanical clutch-actuating mechanisms arranged outside the clutch as such
  • F16D23/14—Clutch-actuating sleeves or bearings; Actuating members directly connected to clutch-actuating sleeves or bearings
  • F16D2023/141—Clutch-actuating sleeves or bearings; Actuating members directly connected to clutch-actuating sleeves or bearings characterised by using a fork; Details of forks

Definitions

• the invention relates to a clutch, in particular a friction clutch, which is arranged in the drive train of a motor vehicle between an internal combustion engine and a transmission, with a diaphragm spring which loads a pressure plate of the clutch and which is associated with a disengaging means which acts on the radially inner region thereof and which is romechanical actuator can be actuated.
• the electromechanical actuators have a pressure spring which is conventionally arranged parallel to the mechanical transmission chain and which is supported against the disengaging means and against a fixed housing part.
• a certain preset basic force on the release means also referred to as a release bearing, is to be generated in the closed state of the clutch in order to increase the service life of its bearing body.
• the object of the invention is to create a clutch of the generic type which is improved with regard to the electromechanical actuator and its connection to a disengaging means.
• the invention is based on the knowledge that a known preset basic force can be applied to the disengaging means by means of the known pressure spring, but so far it has not been prevented that vibrations generated or transmitted by components of the clutch which are in contact with the disengaging means are conducted into the electromechanical actuator, and possibly adversely affect or even damage it.
• a pressure spring is serially integrated in the mechanical transmission chain between the electromechanical actuator actuating the disengaging means and the disengaging means such that, in the closed state of the clutch, on the one hand a certain one Basic force can be generated on the disengaging means, and on the other hand a vibration decoupling to the electromechanical actuator is realized.
• the generation of a basic force on the disengaging means is advantageously combined with a vibration decoupling of the actuator using a single pressure spring.
• the pressure spring only needs small spring travel to develop its effect, which results in a cheaper, smaller and accordingly lighter pressure spring and a reduced installation space for the same.
• the disengaging means is formed by a piston which is guided in a guide bush which is fixedly connected to the electromechanical actuator and which, in turn, is spring-elastic on the one hand with the diaphragm spring and on the other hand in the closed state of the clutch via the pressure spring and in the open state of the clutch is operatively connected to a displacement means of the electromechanical actuator acting axially on the piston.
• the disengaging means and the electromechanical actuator form a structural unit, for example, which has an advantageous effect, in particular with regard to the assembly costs.
• the electromechanical actuator has an electric motor, which in turn is connected via a gear to the displacement means acting axially on the pressure spring and / or the piston.
• the gear unit can be designed as a roller screw drive, which is connected in terms of drive technology to a displacement means in the form of a displacement spindle.
• the release means can be connected via a lever system to a separate release bearing acting on the radially inner area of the diaphragm spring. In contrast, it can also be indicated that the release means itself forms the release bearing.
• the basic force exerted by the pressure spring on the disengaging means can be realized via a defined application torque of the electric motor of the electromechanical actuator and can be infinitely adjusted within limits.
• the application torque of the electric motor advantageously has the effect that the actuator slidably determines its zero position and thus also the wear of the clutch or the friction linings of the clutch disc and the change in position of the disengaging mechanism can be taken into account.
• the electromechanical actuator is equipped with a self-calibrating displacement sensor, which is in each case set to a zero position of the actuator, taking into account any wear of the clutch and an associated change in position of the disengaging mechanism, which in turn provides corresponding signals for a control and Control device for controlling the electric motor provides.
• the displacement sensor can be designed for an incremental or absolute adjustment of the zero position of the actuator.
• the electric motor can have a brake with the electric motor switched off during this time.
• the electric motor is accordingly not permanently energized, which has an advantageous effect both on the service life of the same and on the operating costs of the motor vehicle itself.
• Fig. 1 is a schematic representation of a clutch designed according to the invention together with disengaging means and connected actuator in the closed state of the clutch, and Fig. 2, the friction clutch according to Fig. 1 in the open state.
• a clutch 1 in the form of a friction clutch in the closed state, which is arranged in the drive train of a motor vehicle between an internal combustion engine and a transmission.
• the basic structure of such a coupling 1 is well known, so that the explanation of individual components thereof is largely the same.
• the clutch 1 is initially composed of a clutch housing 3 connected to a flywheel 2 of the internal combustion engine, a pressure plate arranged in the clutch housing 3 in a rotationally fixed but axially displaceable manner and a diaphragm spring arranged between the clutch housing and the pressure plate.
• the diaphragm spring supports itself both on the clutch housing 3 and on the pressure plate, whereby the pressure plate is biased towards the flywheel 2 against a clutch disc with friction linings.
• This clutch side is rotatably connected to the transmission input shaft 12.
• the diaphragm spring is associated with a disengaging means 4 acting on the radially inner region thereof, which in turn can be actuated by means of an electromechanical actuator 5 and is suitable, in a manner known per se, to lift the load on the diaphragm spring on the pressure plate when coupling and to separate it from the internal combustion engine in terms of drive technology ,
• the actuator 5 is preferably supported on a fixed component, such as the gear housing (not shown in more detail).
• the disengaging means 4 is formed by a piston 7 which is fixed in a guide bushing 6 which is fixedly connected to the electromechanical actuator 5 and is flanged to the housing thereof and which, according to a first possible embodiment, is arranged via a lever system 8 with a known separate and coaxial with the diaphragm spring Release bearing 9 is connected.
• the release bearing 9 acts when disengaging due to an axial movement of the piston 7, in the present case towards the clutch 1, on the radially inner region of the diaphragm spring, which removes its load on the pressure plate and consequently the torque transmission path from the internal combustion engine to the transmission input shaft 12 is interrupted (FIG. 2 ).
• a pressure spring 10 is now integrated in the mechanical transmission chain between the electromechanical actuator 5 driving the disengaging means 4 and the disengaging means 4 such that when the clutch 1 is closed (Fig. 1) on the one hand a certain basic force can be generated on the disengaging means 4 or release bearing 9, and on the other hand vibration isolation from the electromechanical actuator 5 is realized.
• the piston 7 of the disengaging means 4 is operatively connected at one end to the diaphragm spring and at the other end in the closed state of the clutch 1 via the pressure spring 10 with an axially acting displacement means 11 of the electromechanical actuator 5.
• the electromechanical actuator 5 essentially has an electric motor which is known per se and is accordingly not shown in any more detail and which in turn is connected via a transmission to the displacement means 11 which acts axially on the pressure spring 10.
• gears in the form of roller screw drives, which act on a displacement means 11 in the form of a displacement spindle, have proven to be advantageous. This measure makes it possible to achieve a compact construction of the actuator 5, which in turn goes hand in hand with a reduced installation space.
• Fig. 2 shows the clutch 1 in the open state. Thereafter, such an actuating force overcoming the spring force was applied to the pressure spring 10 by means of the electric motor via the displacement means 11 that the displacement means 11 is supported directly on the end face on the piston 7, and on the other hand the same is displaced so far axially towards the clutch 1 that Such an actuating force on the lever system 8 Release bearing 9 and accordingly can be exercised on the diaphragm spring, which removes the load on the diaphragm spring on the pressure plate and thus opens the clutch.
• the electromechanical actuator 5 may also be appropriate to equip the electromechanical actuator 5 with a self-calibrating displacement sensor, which in turn rests on a zero position of the actuator 5, in order to take into account any wear on the clutch 1 and a change in the disengagement path associated therewith, which in turn sends corresponding signals to a control Provides control and regulation device for controlling the electric motor of the actuator 5 (not shown in detail).
• the displacement sensor can be designed for an incremental or absolute adjustment of the zero position of the actuator 5.
• This measure can ensure an almost constant basic force on the disengaging means 4 or the disengaging bearing 9 over the entire life of the clutch 1 or its clutch linings in the closed state of the clutch 1.
• the exemplary embodiment explained is based on a disengaging means 4, which is operatively connected via a lever system 8 and a separate disengaging bearing 9 via the diaphragm spring of the clutch 1.
• a disengaging means 4 which is operatively connected via a lever system 8 and a separate disengaging bearing 9 via the diaphragm spring of the clutch 1.
• the disengaging means themselves as a disengaging bearing, in which case, according to a further possible embodiment, the piston 7 of the disengaging means 4 acts directly on the radially inner region of the diaphragm spring.
• both a radial arrangement of the disengaging means 4 together with the piston 4 and actuator 5 next to the transmission input shaft 12 and a coaxial arrangement of at least the disengaging means 4 including the piston 7 to the transmission input shaft 12 are conceivable (not shown in more detail).

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
• Mechanical Operated Clutches (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (5)

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• 2004
  • 2004-04-21 DE DE102004019280A patent/DE102004019280A1/de not_active Withdrawn
• 2005
  • 2005-04-09 WO PCT/EP2005/003747 patent/WO2005106271A1/de active Application Filing
  • 2005-04-09 EP EP05716565A patent/EP1738090A1/de not_active Withdrawn
  • 2005-04-09 US US11/578,857 patent/US20070235278A1/en not_active Abandoned
  • 2005-04-09 JP JP2007508766A patent/JP2007533926A/ja not_active Withdrawn

Non-Patent Citations (1)

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