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
  • F16H63/3023—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by fluid pressure
  • F16H63/3026—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by fluid pressure comprising friction clutches or brakes
• • 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
  • F16D25/00—Fluid-actuated clutches
  • F16D25/06—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch
  • F16D25/062—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces
  • F16D25/063—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially
  • F16D25/0635—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially with flat friction surfaces, e.g. discs
  • F16D25/0638—Fluid-actuated clutches in which the fluid actuates a piston incorporated in, i.e. rotating with the clutch the clutch having friction surfaces with clutch members exclusively moving axially with flat friction surfaces, e.g. discs with more than two discs, e.g. multiple lamellae
• • 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
  • F16D25/00—Fluid-actuated clutches
  • F16D25/10—Clutch systems with a plurality of fluid-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
  • 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
  • F16H61/04—Smoothing ratio shift
  • F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure

Definitions

• the present invention relates to a stepped automatic transmission for motor vehicles, with a plurality of clutches and brakes, which are at least partially designed as wet-running multi-plate clutches, with inner and outer plate carriers, each provided with a plate set, according to the preamble of claim 1.
• EP-B 434 525 describes an automatic transmission for motor vehicles which has planetary gear sets which are shifted by means of clutches and brakes and which is connected to a hydraulic torque converter provided with a lock-up clutch. Furthermore, the automatic transmission has an input shaft and an output shaft, with a double planetary gear set, at least one power path between the input shaft and the double planetary gear set, as well as three clutches and two brakes, the selective engagement of which determines different transmission ratios between the input shaft and the output shaft. With these three clutches and two brakes, six forward gears and one reverse gear can be achieved.
• DE-A 40 37 092 describes a method for controlling the torque by means of an internal combustion engine which is connected to an automatic transmission which is driven by the internal combustion engine, the latter being associated with control electronics which are based on speed, load and possibly Temperature signals controls the ignition angle of the ignition system and / or the injection pulse width of the fuel injection system.
• a transmission electronics assigned to the automatic transmission in turn controls the switching operations of the automatic transmission on the basis of speed and load request signals.
• the object of the present invention is to design a stepped automatic transmission for motor vehicles in such a way that this loss of shifting comfort does not occur.
• the piston of the clutch is assigned a baffle plate for the hydraulic oil in such a way that an additional pressure chamber is formed, which is designed such that the overall stroke of the piston is not hindered.
• the baffle plate can be arranged inside or outside the clutch; if the required differential area is not achieved by the two pressure spaces separated from one another by the baffle plate, each pressure space is advantageously provided with a fluid line, so that the two pressure chambers can be acted on with different pressures.
• the embodiment according to the invention thus achieves the advantage that the large piston area required for the high static holding torque of the clutch is reduced by creating a differential area on the same clutch, so that the switching operations can be reduced as a function of the differential area; this means an optimal adaptation of the clutch to high holding and low switching torques, without additional effort resulting from an additional clutch.
• the electronic control unit for the transmission controls the differential area formed in this way in a simple manner.
• FIG. 2 shows a partial section through a stepped automatic transmission with a baffle plate arranged outside the clutch.
• Pressure chamber 3 is formed, which is designed such that the overall stroke of the piston 1 is not hindered.
• both the remaining piston chamber 4 and the pressure chamber 3 separated by the baffle plate 2 are supplied with the same fluid pressure.
• the baffle plate 2 is arranged within the clutch D; In the embodiment shown in FIG. 2, the baffle plate 2 is arranged outside the clutch, the additional pressure space formed in the piston 1 being designated by 3 here too.
• the two pressure chambers can also be subjected to different pressures. to make the switching operations sensitive with low switching forces;
• the two pressure chambers 3, 4 are each to be provided with their own fluid line and to be controlled separately.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Mechanical Engineering (AREA)
• Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
• General Details Of Gearings (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7914557

Family Applications (1)

Country Status (6)

Families Citing this family (11)

Citations (6)

Family Cites Families (14)

• 1999
  • 1999-07-13 DE DE19932614A patent/DE19932614A1/de not_active Withdrawn
• 2000
  • 2000-07-07 US US09/980,319 patent/US6595339B1/en not_active Expired - Lifetime
  • 2000-07-07 DE DE50000889T patent/DE50000889D1/de not_active Expired - Lifetime
  • 2000-07-07 EP EP00944014A patent/EP1192371B1/de not_active Expired - Lifetime
  • 2000-07-07 JP JP2001509892A patent/JP2003504577A/ja not_active Withdrawn
  • 2000-07-07 WO PCT/EP2000/006438 patent/WO2001004518A1/de not_active Ceased
  • 2000-07-07 KR KR1020027000273A patent/KR100700228B1/ko not_active Expired - Lifetime

Patent Citations (6)

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