GB2446153A - A clutch piston housing having a dead volume filled with a sponge material - Google Patents

A clutch piston housing having a dead volume filled with a sponge material Download PDF

Info

Publication number
GB2446153A
GB2446153A GB0701843A GB0701843A GB2446153A GB 2446153 A GB2446153 A GB 2446153A GB 0701843 A GB0701843 A GB 0701843A GB 0701843 A GB0701843 A GB 0701843A GB 2446153 A GB2446153 A GB 2446153A
Authority
GB
United Kingdom
Prior art keywords
piston
clutch
sponge material
piston housing
housing
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB0701843A
Other versions
GB0701843D0 (en
GB2446153B (en
Inventor
Marc Andres
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GM Global Technology Operations LLC
Original Assignee
GM Global Technology Operations LLC
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 GM Global Technology Operations LLC filed Critical GM Global Technology Operations LLC
Priority to GB0701843A priority Critical patent/GB2446153B/en
Publication of GB0701843D0 publication Critical patent/GB0701843D0/en
Publication of GB2446153A publication Critical patent/GB2446153A/en
Application granted granted Critical
Publication of GB2446153B publication Critical patent/GB2446153B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F16D25/12—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
    • F16D25/06—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
    • 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
    • F16D2048/0212—Details of pistons for master or slave cylinders especially adapted for fluid control

Abstract

A clutch which shifts gears in an automatic transmission, comprises a piston 2 mounted within a piston housing 1 so as to form a volume therebetween. This volume, e.g. dead volume, is filled out with a sponge material when the clutch is released. The sponge material may be fixed by glue to a back of the piston housing 1 or to the piston 2 or to both so as to achieve a spring effect. The addition of the sponge material decreases the size of the dead volume thereby reducing the shift time since oil has to fill out a smaller volume at a beginning of a shift because the sponge material keeps the oil in place when the piston 2 is not activated. Piston 2 is axially moveable with respect to a compensator and configured to selectively abut and engage a clutch pack.

Description

Clutch for an Automatic Transmission The invention relates to a clutch
for an automatic transmission.
In automatic transmissions, gear shifts are done by applying hydraulic pistons on clutch packs as illustrated by the following
prior art.
The document VS 6,684,995 A describes a clutch assembly for a transmission which is configured selectively to interconnect a rotating member by engagement of a clutch pack. The clutch assembly includes a compensator and a piston which is axially moveable with respect to the compensator and configured selectively to abut and engage the clutch pack to interconnect the first and second rotating members. A clutch housing encloses the piston, compensator and clutch pack. A piston cavity is formed between the housing and piston to receive fluid from a clutch apply feed orifice to actuate the piston. A compensator cavity is formed between the compensator and piston to receive fluid from a compensator feed orifice. The piston cavity and compensator cavity are configured such that fluid in the compensator cavity provides a greater centrifugal pressure force against the piston in a clutch release direction than fluid in the piston cavity provides against the piston in a clutch apply direction during rotation, thereby eliminating the need for a return spring in the compensator cavity.
A clutch piston amplifier assembly is known from document US 2005/0284724 A]. which is provided for applying pressure to a clutch pack for engaging a first member and second member of an automatic transmission. The clutch piston amplifier assembly utilizes an amplifier piston which applies a secondary force to an apply piston for increasing the apply force that can be obtained from the clutch assembly without increasing the diameter of the apply piston of the line pressure supplied to the piston assembly.
The invention seeks to find an economic solution to increase the shift speed of the clutch.
This can be achieved according to the claimed subject matter in that the volume which is present between the clutch piston and the piston housing upon releasing of the clutch piston is filled out with material.
The invention makes use of the following considerations.
When the hydraulic piston is released, there is a volume called "dead volume" in the piston chamber. At the beginning of the shift, the oil has to fill out this dead volume: the bigger the volume is, the longer the shift is. As a consequence, dead volume has to be decreased in order to improve the shift speed (reduce shift time) By adding the material into the dead volume, the dead volume can be reduced and thereby the shift speed improved.
In a preferred embodiment of the invention, the material has a spongy structure.
The material may be sponge. This material adopts the form of the piston housing and of the clutch piston and its spongy structure allows Oil pressure to be applied on entire piston surface prior to its take-off and the oil keeps in place when the piston is not actuated.
According to an embodiment, the material can be fixed in the back of the piston housing.
Alternatively, it is possible to fix the material on the clutch piston.
It is also possible according to an embodiment that the material is fixed both in the back of the piston housing and on the clutch piston thereby achieving a spring effect.
This spring effect could replace the piston return spring in some specific cases.
The present invention will become fully understood from the detailed description and the accompanying drawing, wherein: Fig. 1 is a schematic view of a clutch system corresponding to an embodiment of the invention.
Fig. 1 shows the piston housing 1 as well as the corresponding clutch piston 2 and the piston spring 3.
According to the preferred embodiment, the "dead volume" between the piston housing 1 and the clutch piston 2 is reduced as much as possible by adding material 4, preferably spongy material in this dead volume.
This spongy material 4 may be either fixed in the back of the pistozi housing 1 or on the clutch piston 2. It is also possible to fix the spongy material on both piston housing 1 and clutch piston 2. The spongy material 4 having a spring effect, it might be possible to replace the piston return spring 3 by the spongy material 4 in some specific cases.
The spongy material 4 may be glued to the piston housing 1 and/or the clutch piston 2 with an adequate glue.

Claims (5)

1. A clutch assembly including a compensator and a piston which is axially moveable with respect to the compensator and configured to selectively abut and engage the clutch pack to interconnect first and second rotating members, wherein the volume which is present between the clutch piston (2) and the piston housing (1) upon releasing of the clutch piston (2) is filled out with material (4) 2. The clutch assembly of claim 1, wherein the material (4) has a spongy structure.
3. The clutch assembly of claim 1 or 2, wherein the material (4) is fixed in the back of the piston housing (1) 4. The clutch assembly of claim 1 or 2, wherein the material (4) is fixed on the clutch piston (2) 5. The clutch assembly of claim 1 or 2, wherein the material (4) is fixed both in the back of the piston housing (1) and on the clutch piston (2) thereby achieving a spring effect.
-Amendments to the claims have been filed as follows -(2
I. A clutch assembly comprising a clutch piston which is axially moveable in a piston housing and configured to selectively abut and engage a clutch pack to interconnect first and second rotating members, characterized in that the volume which is present between the clutch piston (2) and the piston housing (1) upon releasing of the clutch piston (2) is filled out with material (4) which has a spongy structure.
2. The clutch assembly of claim 1, characterized in that the material (4) is fixed on the piston housing (I).
3. The clutch assembly of claim 1, characterized in that the material (4) is fixed on the clutch piston (2).
4. The clutch assembly of claim 1, characterized in that the material (4) is fixed both in on the piston housing (I) and on the clutch piston (2) thereby achieving a spring effect. * ** I * S * *5 *5*5 * **** I* aS Is S * *
S ***
S 5S55
S I...
5.
S
GB0701843A 2007-01-31 2007-01-31 Clutch assembly for an automatic transmission Expired - Fee Related GB2446153B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0701843A GB2446153B (en) 2007-01-31 2007-01-31 Clutch assembly for an automatic transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0701843A GB2446153B (en) 2007-01-31 2007-01-31 Clutch assembly for an automatic transmission

Publications (3)

Publication Number Publication Date
GB0701843D0 GB0701843D0 (en) 2007-03-14
GB2446153A true GB2446153A (en) 2008-08-06
GB2446153B GB2446153B (en) 2009-06-03

Family

ID=37891040

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0701843A Expired - Fee Related GB2446153B (en) 2007-01-31 2007-01-31 Clutch assembly for an automatic transmission

Country Status (1)

Country Link
GB (1) GB2446153B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009095064A1 (en) * 2008-01-31 2009-08-06 Daimler Ag Torque transmission device for a motor vehicle
WO2020043240A1 (en) * 2018-08-27 2020-03-05 Schaeffler Technologies AG & Co. KG Hybrid module with separating clutch and actuating device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6241208A (en) * 1985-08-16 1987-02-23 Denki Kagaku Kogyo Kk Production of polymer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6241208A (en) * 1985-08-16 1987-02-23 Denki Kagaku Kogyo Kk Production of polymer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009095064A1 (en) * 2008-01-31 2009-08-06 Daimler Ag Torque transmission device for a motor vehicle
WO2020043240A1 (en) * 2018-08-27 2020-03-05 Schaeffler Technologies AG & Co. KG Hybrid module with separating clutch and actuating device
CN112352113A (en) * 2018-08-27 2021-02-09 舍弗勒技术股份两合公司 Hybrid module with a separating clutch and an actuating device
US11407300B2 (en) 2018-08-27 2022-08-09 Schaeffler Technologies AG & Co. KG Hybrid module with separating clutch and actuating device

Also Published As

Publication number Publication date
GB0701843D0 (en) 2007-03-14
GB2446153B (en) 2009-06-03

Similar Documents

Publication Publication Date Title
EP2901014B1 (en) Hydraulic apparatus having an improved structure for the cylinder implementation thereof
EP1557543A3 (en) A variable capacity fluid pump for an engine
WO2009069391A1 (en) Torque converter
EP2610518B1 (en) Vehicle hydraulic clutch apparatus
WO2009008191A1 (en) Automatic transmission
EP1669638A3 (en) Transmission with electromagnetic brake
US20180051756A1 (en) Clutch system
PL179176B1 (en) Transmission, especially for vehicles, and method of controlling same
CN103429924A (en) Clutch pack travel compensator for reduced drag
EP2138733A3 (en) Multi-plate clutch
JP2015222100A (en) Transmission brake system
US9995385B2 (en) Method and device for actuating a shift element of an automatic transmission having a start-stop means
KR20120053307A (en) Driving device for construction vehicle
EP3087285B1 (en) Improved disk brake, comprising a hydraulic actuation parking brake and a wear adjustment unit
GB2446153A (en) A clutch piston housing having a dead volume filled with a sponge material
US20140110214A1 (en) Hydraulic filler for a transmission
DE102007003922A1 (en) Automatic gear for vehicle, has hydraulically operated switching elements for switching gears where switching elements have sliding switching element piston which are assigned pressure compensating units
DE10063781C2 (en) Coupling system with a clutch device operated by master cylinder
CN209856264U (en) Clutch piston balance oil pressure mechanism suitable for large-torque commercial vehicle gearbox
US8250967B2 (en) Automatic transmission servo
CN111120533B (en) Buffer device for transmission
US20180238442A1 (en) Method for operating an automatic gearbox of a motor vehicle
CN204512240U (en) A kind of automobile hydraulic brake
CN211371083U (en) Multifunctional clutch release bearing
EP3087290B1 (en) Disk brake comprising a parking brake having enhanced hydraulic actuation

Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20090305 AND 20090311

732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20091029 AND 20091104

732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20091105 AND 20091111

PCNP Patent ceased through non-payment of renewal fee

Effective date: 20140131