WO2009065686A1 - Élément à commutation en charge - Google Patents

Élément à commutation en charge Download PDF

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Publication number
WO2009065686A1
WO2009065686A1 PCT/EP2008/064230 EP2008064230W WO2009065686A1 WO 2009065686 A1 WO2009065686 A1 WO 2009065686A1 EP 2008064230 W EP2008064230 W EP 2008064230W WO 2009065686 A1 WO2009065686 A1 WO 2009065686A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
pistons
element according
pressure
switching element
Prior art date
Application number
PCT/EP2008/064230
Other languages
German (de)
English (en)
Inventor
Matthias Reisch
Gerhard Gumpoltsberger
Bernard Hunold
Original Assignee
Zf Friedrichshafen Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zf Friedrichshafen Ag filed Critical Zf Friedrichshafen Ag
Publication of WO2009065686A1 publication Critical patent/WO2009065686A1/fr

Links

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
    • 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
    • F16D48/00—External control of clutches
    • F16D48/02—Control by fluid 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
    • F16D48/00—External control of clutches
    • F16D48/02—Control by fluid pressure
    • F16D2048/0212—Details of pistons for master or slave cylinders especially adapted for fluid control

Definitions

  • the present invention relates to a load switching element according to the preamble of patent claim 1.
  • Power shift elements are usually used in automatic transmissions, for example in automatic transmissions in planetary design.
  • Planetary-type automatic transmissions include planetary gear sets and load shifting elements designed as frictionally engaged multi-plate clutches and brakes for shifting the planetary gear sets, wherein the shifting elements are as a rule hydraulically actuated by means of pistons.
  • the dimensioning of the switching elements, in particular with respect to the diameter and the number of lamellae and the piston depends on the maximum torque to be transmitted in the various gears of the transmission.
  • a switching element is provided which is actuated only in the first forward gear and in reverse gear and which, especially in reverse, a significantly higher torque must support as in the first forward.
  • this function is taken over by the brake D.
  • the Applicant shows a load switching element, which has both a frictional and a positive mode of action.
  • the known power shift element comprises a frictional and a form-locking switching element, which are preferably connected in series and are operable for closing the switching element by an actuator in this order.
  • an axially movable element for example a piston
  • a force which presses via a transmission element both on a disk set of a frictionally engaged switching element and on a displaceable jaw element.
  • the known power shift element comprises a frictional and a form-locking switching element which are connected in parallel and are operable to close the switching element of an actuator in the order frictional switching element, form-locking switching element.
  • the friction-locked shifting element comprises a disk pack, the form-fitting shifting element having a claw assembly comprising an axially displaceable claw element guided in the housing of the shifting element.
  • a spring element is provided, which is on the one hand with an actuator, which is preferably designed as a hydraulically operated piston and on the other hand with the end plate of the plate pack and with the jaw member in operative connection.
  • the frictional and the positive switching element by means of a piston or an actuator via a spring element are actuated such that first the frictional switching element for generating a friction torque (and also for synchronization) and from a defined piston or Aktuatorkraft the positive switching element is actuated whereby the jaw member is engaged in a corresponding dog teeth of a plate carrier of the plate pack, so that a positive connection is established.
  • the present invention has for its object to provide a load switching element, which can be small in size, is suitable for transmitting high torques, in a specific work area with lower forces can be controlled and in the open state has lower drag torques than those of the prior art known load switching elements. Furthermore, the switching element according to the invention should open at signal or power interruption, so that an existing safety concept in the transmission can remain unchanged.
  • a designed as a frictional shift element load switching element comprising a disk set, wherein for actuation or loading of the disk set with force at least two pistons are provided, which are arranged radially offset in the same piston chamber. These pistons are held by spring force in the initial position and returned to this, wherein for each of the at least two pistons in dependence on the piston surface and / or the spring design, a pressure is defined, from which the piston moves.
  • the frictional switching element may in this case be designed as a multi-plate clutch, multi-disc brake, as a cone clutch, etc.
  • an axially displaceable seal is arranged between each two radially adjacent pistons, whereby the pistons are sealed to each other, so that is sealed by the movable sealing point of the pressure chamber even with axial movement of one or both pistons against the environment; Accordingly, the at least two pistons are actuated with the same pressure medium, for example with oil, air, water etc.
  • the axially displaceable seal in the event that two pistons are provided, if the order of movement of the pistons when pressurized is that only at higher pressure movable piston have a sealing ring for sealing against the other piston.
  • both pistons are held by spring force in the starting position, wherein the spring force is also used to return the piston according to the invention.
  • a separate spring is provided for each piston; Alternatively, it can be provided that acts on the at least two pistons a single spring via a common abutment.
  • the springs may be formed, for example, as disc springs with or without slotting and with any linear or non-linear characteristic or as coil springs, wherein any other mechanical spring design can be used as a spring.
  • the springs and / or the piston surfaces are coordinated so that one of the at least two pistons from a first pressure, preferably from the application pressure is moved and applies to the disk set, the second piston only at a (clearly ) moves higher pressure and also applies to the disk pack to exert an additional force on the disk pack.
  • each additional piston by means of the spring design and the piston surface, a pressure is assigned, from which the piston moves, wherein the piston associated pressures have different values. In this way, the characteristic of the switching element can meet any requirements.
  • the first pressure range in which only the first piston acts, is used to control / regulate the friction torque in the slip state of the frictional engagement element during a drive, engage a gear or during a gear change or to set a defined slip for vibration decoupling within a corridor.
  • the second pressure range in which the second piston acts in addition, serves to safely transmit an applied torque on the frictional switching element without slip within an inserted gear.
  • the fail-safe principle as in switching elements according to the prior art maintained so that when signal or power interruption, the switching element opens, whereby an existing safety concept in the transmission can remain unchanged.
  • Figure 1 A schematic sectional view of an advantageous embodiment of the invention in the open state
  • Figure 2 is a schematic sectional view of the embodiment of the invention shown in Figure 1 in a state in which the first piston is applied;
  • Figure 3 is a schematic sectional view of the embodiment of the invention shown in Figure 1 in a state in which the first and the second piston are applied;
  • Figure 4 A pressure-force diagram illustrating an exemplary pressure-force curve of a switching element according to the invention.
  • the load switching element according to the invention as a multi-disc brake, comprising a disk set 1 is formed.
  • two pistons 2, 5 are provided for actuating or for acting on the disk set 1 with force, which pistons 2, 5 are arranged radially offset in the same piston chamber 7.
  • an axially displaceable seal 4 is preferably arranged, whereby the pistons 2, 5 are sealed to each other.
  • G denotes a housing.
  • each piston 2, 5 associated with a spring 3 and 6, which serves to hold the respective piston in the starting position and to the provision thereof.
  • the springs 3, 6 and / or the piston surfaces of the pistons 2, 5 are coordinated so that a piston is moved from the contact pressure, and applies to the disk set 1, so that this for controlling the friction torque in the slip state of frictionally engaged switching element is used wherein the second piston moves only at a higher pressure and also applies to the disk set, which is used for safe transfer of an applied torque on the frictional switching element without slippage.
  • a first step the common piston chamber 7 is filled and the first piston 2 is applied against the force of the spring 3 to the disk set 1. Subsequently, the pressure in the piston chamber 7 is increased, whereby a friction torque is generated in the disk set by the piston 2. Subsequently, the circuit can be carried out, wherein modulation of the pressure, a control / regulation of the friction torque in the disk set is possible.
  • the pressure can be increased to a first holding pressure, wherein the second piston is not moved, since the Holding pressure is below the pressure at which the second piston 5 can be moved against the force of the spring 6.
  • the piston pressure can be further increased in defined gears and with a required holding function, whereby the piston 5 is applied and a higher torque can be supported.
  • Fig. 2 the power switching element shown in Fig. 1 is shown in a state in which the piston 2 is applied, and in Fig. 3, the switching element shown in Figs. 1 and 2 is shown in a state in which both pistons 2, 5 are applied ,
  • FIG 4 shows an exemplary pressure-force curve of a switching element according to the invention is shown.
  • the first piston 2 acts in the first region A and generates a force F corresponding to the piston surfaces on the disk set 1.
  • the second piston 5 also commences accordingly its surface to generate an additional force F on the disk set.
  • the first area A can advantageously serve the slip control and the second area B of the secure torque transmission or torque support.
  • the power shift element according to the invention can be used in any automatic transmission systems, for example in planetary gears, Vorgelegelastschaltgetriebe, dual-clutch transmissions or continuously variable transmissions.
  • the load switch element may be employed in the V / R group of stepless wrap-around lifts and in a range of multi-range split power friction gearboxes, continuously variable hydrostatic transmissions, or multi-range electric power split transmissions.

Landscapes

  • 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)

Abstract

L'invention concerne un élément à commutation en charge réalisé sous forme d'élément de commutation à friction, comprenant un groupe de disques (1). Pour actionner ou encore pour solliciter en force le groupe de disques (1), il est prévu au moins deux pistons (2, 5), qui sont disposés en étant radialement décalés dans la même chambre de piston (7) et qui sont maintenus dans la position initiale et peuvent être ramenés dans cette position par force de ressort. Pour chacun des deux pistons (2, 5) ou davantage, une pression à partir de laquelle le piston (2, 5) se déplace est définie en fonction de la surface du piston et/ou du dimensionnement du ressort.
PCT/EP2008/064230 2007-11-23 2008-10-22 Élément à commutation en charge WO2009065686A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007047852A DE102007047852A1 (de) 2007-11-23 2007-11-23 Lastschaltelement
DE102007047852.8 2007-11-23

Publications (1)

Publication Number Publication Date
WO2009065686A1 true WO2009065686A1 (fr) 2009-05-28

Family

ID=40270953

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/064230 WO2009065686A1 (fr) 2007-11-23 2008-10-22 Élément à commutation en charge

Country Status (2)

Country Link
DE (1) DE102007047852A1 (fr)
WO (1) WO2009065686A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102042347A (zh) * 2010-12-17 2011-05-04 江苏大学 动力换挡变速器离合器缓冲活塞机构
CN106838047A (zh) * 2017-03-14 2017-06-13 杭州前进齿轮箱集团股份有限公司 一种双油缸离合器结构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010049811A1 (de) * 2010-10-20 2012-04-26 Stromag Ag Druckmittelbetätigte Reibkupplung oder -bremse
DE102016014724A1 (de) * 2016-12-09 2018-06-14 Daimler Ag Lamellenkupplung für ein Kraftfahrzeug

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1575925B1 (de) * 1965-04-16 1969-10-23 Int Harvester Co Hydraulisch betaetigbare Scheiben-Reibungskupplung,insbesondere Doppelkupplung
US3690429A (en) * 1971-07-15 1972-09-12 Honda Motor Co Ltd Clutch with dual pistons and springs
US4664242A (en) * 1985-09-30 1987-05-12 General Motors Corporation Torque transmitting device having a fluid-operated piston
US20030089573A1 (en) * 2001-11-09 2003-05-15 Zf Sachs Ag Clutch arrangement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4070927A (en) 1976-06-04 1978-01-31 General Motors Corporation Planetary gearing arrangement for a transmission
FR2656055B1 (fr) 1989-12-18 1994-04-29 Lepelletier Pierre Transmission automatique multivitesses pour vehicule automobile.
DE102007036097A1 (de) 2007-08-01 2009-02-05 Zf Friedrichshafen Ag Lastschaltelement
DE102007036100A1 (de) 2007-08-01 2009-02-05 Zf Friedrichshafen Ag Lastschaltelement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1575925B1 (de) * 1965-04-16 1969-10-23 Int Harvester Co Hydraulisch betaetigbare Scheiben-Reibungskupplung,insbesondere Doppelkupplung
US3690429A (en) * 1971-07-15 1972-09-12 Honda Motor Co Ltd Clutch with dual pistons and springs
US4664242A (en) * 1985-09-30 1987-05-12 General Motors Corporation Torque transmitting device having a fluid-operated piston
US20030089573A1 (en) * 2001-11-09 2003-05-15 Zf Sachs Ag Clutch arrangement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102042347A (zh) * 2010-12-17 2011-05-04 江苏大学 动力换挡变速器离合器缓冲活塞机构
CN106838047A (zh) * 2017-03-14 2017-06-13 杭州前进齿轮箱集团股份有限公司 一种双油缸离合器结构

Also Published As

Publication number Publication date
DE102007047852A1 (de) 2009-05-28

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