Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
  • F15B15/08—Characterised by the construction of the motor unit
  • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
  • F15B15/1423—Component parts; Constructional details
  • F15B15/1447—Pistons; Piston to piston rod assemblies
  • F15B15/1452—Piston sealings
• • 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
  • F16D25/12—Details not specific to one of the before-mentioned types
• • 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
  • F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
• • 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
  • F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
  • F16D2025/081—Hydraulic devices that initiate movement of pistons in slave cylinders for actuating clutches, i.e. master cylinders
• • 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
  • F16D48/00—External control of clutches
  • F16D48/02—Control by fluid pressure
  • F16D2048/0227—Source of pressure producing the clutch engagement or disengagement action within a circuit; Means for initiating command action in power assisted devices
  • F16D2048/023—Source of pressure producing the clutch engagement or disengagement action within a circuit; Means for initiating command action in power assisted devices by pedal actuation
• • 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
  • F16D48/00—External control of clutches
  • F16D48/02—Control by fluid pressure
  • F16D2048/0257—Hydraulic circuit layouts, i.e. details of hydraulic circuit elements or the arrangement thereof
  • F16D2048/026—The controlling actuation is directly performed by the pressure source, i.e. there is no intermediate valve for controlling flow or pressure
• • 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
  • F16D2300/00—Special features for couplings or clutches
  • F16D2300/08—Details or arrangements of sealings not provided for in group F16D3/84
• • 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
  • F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
  • F16D25/082—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member the line of action of the fluid-actuated members co-inciding with the axis of rotation
  • F16D25/087—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member the line of action of the fluid-actuated members co-inciding with the axis of rotation the clutch being actuated by the fluid-actuated member via a diaphragm spring or an equivalent array of levers

Definitions

• the invention relates to a cylinder arrangement, at least comprising a cylinder and a piston arranged therein, wherein the piston has at least one sealing element for sealing the relatively movable components piston and cylinder; and a hydraulic or pneumatic return system for a friction clutch, in particular for a motor vehicle.
• the invention relates to a cylinder arrangement having at least one cylinder and a piston arranged therein, wherein the piston has at least one sealing element for sealing the relatively displaceable components piston and cylinder and comprises at least one contact lip with a circumference, which is adapted to abut slidably in installation on a corresponding sealing surface of the cylinder and thus set a sealing effect; wherein at least the sealing surface consists of a non-polar material.
• the cylinder arrangement comprises, for example, a sealing element of a piston, for example a master piston or slave piston of a hydraulic or pneumatic return system, which serves to seal a hydraulic fluid or a pneumatic gas with respect to the environment.
• the sealing element has a contact lip which rests on a corresponding sealing surface and carries out a movement relative to the sealing surface.
• the contact lip is pressed against the sealing surface in such a way that no or only a negligible amount of the hydraulic fluid or of the pneumatic gas can break through this barrier.
• the contact lip not only has to apply the force to the contact lip, but it can also be set up so that it is supported by the fluid and the contact lip is additionally pressed against the corresponding sealing surface.
• the material is a polypropylene or polyethylene.
• thermoplastics from the group of thermoplastics have low intermolecular forces.
• thermoplastics with thermosets makes it clear that the direct linking of polymer chains by atomic bonds has a very large influence on the properties of plastics. But the intermolecular forces (also called minor valences) between the macromolecules play a major role. Since the polymer chains are extremely long, the forces between these chains become very large. Polymer chains possessing polar groups are attracted to each other by dipole-dipole forces. These forces are not as strong as the hydrogen bridges, but much higher than nonpolar plastics such as polyethylene. Nonpolar plastics, such as polyethylene or polypropylene, have much lower softening ranges than other plastics because their polymer chains are held together only by the weak van der Waals forces.
• nonpolar material at least for the sealing surface allows the use of sealing elements, which consist of EPDM.
• sealing elements consist of EPDM.
• the usually occurring Stick-Sl ip effect is reduced here and / or completely suppressed. This is due to the fact that between the sealing element and the sealing surface now lower intermolecular forces act, so that a juxtaposition of sealing element and sealing surface is overcome faster.
• the cylinder consists of the nonpolar material.
• the housing of the cylinder is made entirely of the nonpolar material.
• a coating of a cylinder inner wall wherein the coating (exclusively) comprises the non-polar material;
• a 2K process different materials are assembled into a final product in a common manufacturing process.
• 2K injection molding processes are meant herewith.
• This can z.
• harder plastics can be processed together with nonpolar material, so that, for example, B. a cylinder inner wall at least in the region of the sealing surface of non-polar material and in particular all other areas of the cylinder made of the harder plastic.
• Cohesive compounds are in particular called all compounds in which the connection partners are held together by atomic or molecular forces. At the same time, they are non-detachable compounds that can only be separated by destroying the connectors.
• the cylinder is a master cylinder, a semi-slave cylinder or a slave cylinder.
• the distinction between the individual cylinders is familiar to the person skilled in the art.
• the cylinder is a master cylinder with a primary sealing element and a secondary sealing element (ie, two sealing elements), wherein both sealing elements are arranged on the piston and at least the secondary sealing element bears with the contact lip on the sealing surface and is moved along the sealing surface.
• the primary seal seals the wake region of the cylinder from the actuation and / or the environment.
• the trailing edge of a master cylinder is the area between the primary sealing element and the secondary sealing element, which is filled from a reservoir of the fluid (pressureless).
• the secondary sealing element seals the pressure chamber from the (non-pressurized) wake region.
• the pressure chamber is fluidly connected in particular with the slave cylinder via a pressure line, so that flows through the actuation of the master cylinder fluid from the pressure chamber of the master cylinder via the pressure line to the slave cylinder and thus the slave cylinder is actuated.
• the nonpolar material can be used in particular (also / additionally) for the sealing surface, which cooperates with the primary sealing element of the cylinder arrangement.
• a hydraulic or pneumatic return system for a friction clutch having at least the following components:
• a master cylinder arrangement with a master piston in a master cylinder A slave cylinder arrangement with a slave piston in a slave cylinder,
• the master cylinder arrangement and the slave cylinder arrangement communicate with each other in terms of flow, so that a movement of the master piston can be converted into a movement of the slave piston
• at least one of the cylinder arrangements comprises a cylinder arrangement according to the invention, wherein by means of the at least one sealing element the piston can be sealed relative to the associated cylinder such that an overflow of a fluid in the associated cylinder can be prevented in at least one direction.
• the hydraulic or pneumatic return system consists of a master piston, which can compress a master volume in a master cylinder and a corresponding slave piston, which is moved in a slave cylinder as a result of an increase in volume in the slave cylinder. Contrary to the naming of the piston and the slave piston, a retrograde transfer of forces is also possible. In addition, a translation can take place by different piston surfaces or other elements. At least one of the cylinder arrangements is carried out according to the invention, wherein due to the design of the sealing surface of a non-polar material only a small stick-slip effect occurs.
• a stick-slip effect is particularly preferably suppressed to such an extent that noise no longer takes place and achieves a significantly improved sealing effect over all operating states (piston speed, pressure conditions in the pressure space / wake region, type of fluid, temperature of the fluid) becomes.
• a friction clutch with an axis of rotation for releasably connecting an output shaft to a drive train which has at least the following components:
• At least one friction pack wherein a torque can be transmitted via the friction pack in the pressed-on state
• a return system for actuating the friction pack by means of the slave piston.
• the friction clutch is adapted to releasably transfer torque from an output shaft to a drive train and vice versa.
• this is achieved via the at least one friction pack, as described above, which has an axially displaceable pressure plate which is rotationally fixed, as a rule with the output shaft, which can be pressed against at least one corresponding friction disk and then transmits a torque can.
• the force is generated by an actuating system which is actuated directly or indirectly by a user. From this actuation system, the force goes out, which leads to an axial compression of the at least one Reibvers.
• the actuating system is arranged hydraulically or pneumatically, whereby particularly large axial forces can be generated and a transmission ratio is easily adjustable.
• the use of a cylinder assembly according to the above description is advantageous because noise can disturb the driver.
• a motor vehicle which has a drive unit with an output shaft, a drive train and a friction clutch according to the above description for releasably connecting the output shaft to the drive train.
• the installation space situation for passenger cars of the small car class according to European classification is exacerbated.
• the units used in a passenger car of the small car class are not significantly reduced compared to passenger cars larger car classes. Nevertheless, the available space for small cars is much smaller.
• the here cylinder arrangement allows noise-free operation of a hydraulic release. This is for the Driver particularly pleasant and for small cars, the hydraulic actuation prevails due to increasing component quantities.
• Passenger cars are classified according to vehicle class according to, for example, size, price, weight, power, but this definition is subject to constant change according to the needs of the market.
• vehicles of the class small cars and microcars are classified according to European classification of the class of Subcompact Car and in the British market they correspond to the class Supermini, for example, the class City Car.
• micro car class are a Volkswagen Fox or a Renault Twingo.
• Examples of the small car class are an Alfa Romeo Mito, Volkswagen Polo, Ford Fiesta or Renault Clio.
• FIGS. show particularly preferred embodiments, to which the invention is not limited.
• the figures and in particular the illustrated proportions are only schematic.
• Like reference numerals designate like objects. Show it:
• Fig. 1 a master cylinder arrangement in section
• FIG. 2 shows a detail of the master cylinder arrangement according to FIG. 1;
• Fig. 3 the master cylinder assembly of Figure 1 in the actuated state.
• FIG. 4 shows a detail of the master cylinder arrangement according to FIG. 3;
• Fig. 5 a return system with friction clutch
• Fig. 6 a motor vehicle.
• the piston 4 Via an actuation 43, the piston 4 is moved within the cylinder 3.
• the piston 4 has a primary sealing element 13 and a secondary sealing element 14.
• the primary seal 13 seals the trailing region 38 of the cylinder 3 with respect to the actuator 43 and / or the environment (outside of the cylinder 3).
• the trailing region 38 of a master cylinder 20 is the region between the primary sealing element 13 and the secondary sealing element 14, which is filled from a reservoir of the fluid 23 (without pressure) via an inlet 44.
• the secondary sealing element 14 seals the pressure chamber 37 at least in relation to the (non-pressurized) wake region 38, so that no fluid 23 can escape from the pressure chamber 37 in this direction 45.
• the pressure chamber 37 is in particular fluidly connected to a slave cylinder 22 (not shown) via a pressure line 35 so that fluid 23 flows from the pressure chamber 37 of the master cylinder 20 via the pressure line 35 to the slave cylinder 22 and thus the slave cylinder through actuation of the master cylinder 20 22 is pressed.
• the secondary sealing element 14 moves here with the master piston 19 along the sealing surface 7 on the cylinder inner wall 10.
• the cylinder 3 has on the side of the actuator 43 a stop ring 40 which limits the path of the piston 4 and the actuator 43 in a direction 45.
• the stop ring 40 cooperates with an O-ring 41 to seal the cylinder. 3
• FIG. 2 shows a detail of the master cylinder arrangement 15 according to FIG. 1.
• the secondary sealing element 14 is arranged on the piston 4 and has a contact lip 5, which rests on a corresponding, formed on the cylinder inner wall 10, sealing surface 7 and relative to the sealing surface 7 performs a movement.
• the contact lip 5 is pressed against the sealing surface 7 such that no or only a negligible amount of the hydraulic fluid 23 or of a pneumatic gas can break through this barrier.
• the sealing surface 7 within the housing 39 of the cylinder 3 is formed here by a non-polar material 8.
• This material 8 can be arranged on the cylinder inner wall 10 as a coating 9, as a sleeve 11 or as a result of a 2K process 12.
• FIG. 3 shows the master cylinder arrangement 15 from FIG. 1 in the actuated state.
• the piston 4 has been moved along the direction 45 toward the pressure line 35, so that fluid 23 exits the pressure chamber 37 and is fed via the pressure line 35 to a slave cylinder 22.
• the secondary sealing element 14 was moved along the sealing surface 7 in the direction 45.
• the return spring 42 in the pressure chamber 37 is tensioned, so that the restoring spring exerts a restoring force on the piston 4.
• FIG. 4 shows a detail of the master cylinder arrangement 15 according to FIG. 3.
• the contact lip 5 of the secondary sealing element 15 is moved along the direction 45 along the sealing surface 7 and furthermore seals the trailing region 38 with respect to the surroundings or with respect to the actuation 43.
• FIG. 5 shows a hydraulic or pneumatic return system 17, wherein in a master cylinder arrangement 15 a master piston 19 can be actuated in a master cylinder 20 via a clutch pedal 33.
• the master piston 19 is sealed relative to the master cylinder 20 by means of a sealing element 2, as shown for example in FIGS. 2 and 4, and thus a fluid 23 in the master cylinder 20 can be influenced by the master piston 19.
• the fluid 23 is pressed upon actuation of the clutch pedal 33 in the slave cylinder 22 of a slave cylinder assembly 16 and by another sealing element 2, as shown for example in Fig. 1, the effect of the flowing fluid 23 to the slave piston 21 transmitted.
• the latter actuates a disc spring 36, which thus disengages the friction pack 27 of a friction clutch 18, so that a torque which is applied to an output shaft 25 is no longer transmitted to the transmission shaft 34.
• the friction clutch 18 has an axis of rotation 24 about which the elements of the friction clutch 18 rotate.
• a motor vehicle 28 is shown with a drive unit 29, which is arranged with its motor axis 32 transverse to the longitudinal axis 31 in front of the driver's cab 30.
• the drive unit 29 is shown here as an internal combustion engine, which is connected via an output shaft 25 by means of a friction clutch 18, which has a rotation axis 24 in alignment with the motor axis 32, to a drive train 26 shown purely schematically here.

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=53783543

Family Applications (1)

Country Status (4)

Families Citing this family (3)

Citations (1)

Family Cites Families (7)

• 2014
  • 2014-07-24 DE DE102014214512.0A patent/DE102014214512A1/de not_active Withdrawn
• 2015
  • 2015-06-17 DE DE112015003411.0T patent/DE112015003411A5/de not_active Withdrawn
  • 2015-06-17 CN CN201580040942.5A patent/CN106662129A/zh active Pending
  • 2015-06-17 WO PCT/DE2015/200375 patent/WO2016012013A1/de active Application Filing
  • 2015-06-17 EP EP15747377.8A patent/EP3172448A1/de not_active Withdrawn

Patent Citations (1)

Non-Patent Citations (1)

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