GB2463649A - Automatic transmission with viscoelastic damping of clutch - Google Patents

Automatic transmission with viscoelastic damping of clutch Download PDF

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Publication number
GB2463649A
GB2463649A GB0817066A GB0817066A GB2463649A GB 2463649 A GB2463649 A GB 2463649A GB 0817066 A GB0817066 A GB 0817066A GB 0817066 A GB0817066 A GB 0817066A GB 2463649 A GB2463649 A GB 2463649A
Authority
GB
United Kingdom
Prior art keywords
hub
damper
clutch
support means
automatic transmission
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.)
Withdrawn
Application number
GB0817066A
Other versions
GB0817066D0 (en
Inventor
Olivier Schwartz
Matthieu Hiard
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 GB0817066A priority Critical patent/GB2463649A/en
Publication of GB0817066D0 publication Critical patent/GB0817066D0/en
Publication of GB2463649A publication Critical patent/GB2463649A/en
Withdrawn legal-status Critical Current

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
    • F16D13/00—Friction clutches
    • F16D13/58—Details
    • F16D13/60—Clutching elements
    • F16D13/64—Clutch-plates; Clutch-lamellae
    • F16D13/68—Attachments of plates or lamellae to their supports
    • F16D13/683—Attachments of plates or lamellae to their supports for clutches with 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
    • F16D25/06—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
    • F16D2300/00—Special features for couplings or clutches
    • F16D2300/22—Vibration damping
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Operated Clutches (AREA)

Abstract

An automatic transmission has a housing (1, fig 1) in which a clutch (2), a hub (3) and a shaft 4 are arranged. A vibration damper (8) which prevents squawk noise comprises a viscoelastic material 7 that is mounted between a support means 5 formed as an open circle and a constraint 6. The support means 5 couples the vibration damper (8) to the hub (3) and is located in a groove 9 in the hub (3). The damper (8) may reduce fuel consumption since it has a reduced weight that along with efficiency increases and spin loss reduction are the most important factors in order to reduce fuel consumption.

Description

DESCRIPTION
Automatic transmission The invention concerns an automatic transmission within a housing in which a clutch system, a hub and a shaft are arranged.
Automatic transmissions can be affected by troublesome noises occurring while applying or releasing a clutch system. From a general perspective a so-called shifting noise is caused by an instability in the clutch system. It is sometimes necessary to implement a damper in the clutch system to dampen the effects of the instability.
In some automatic transmissions for instance, while applying or releasing a clutch system, a torsional vibration mode of the clutch hub and shaft assembly is excited causing the so-called squawk noise. The hub and the shaft form the resonator for the squawk noise.
The system behaves as a spring mass system with one degree of freedom with the hub and the clutch plates (inertia) oscillating across the shaft (spring) which is ground. The friction material/fluid combination can result in a negative slope in the Mu-slip curve (friction coefficient vs clutch slip curve) that will cause an instability of the clutch system. This results in negative damping of the system, an inherently unstable condition that is excited by clutch torque, and causes a torsional oscillation in the hub/shaft system that is observed as squawk.
A first approach in order to solve this problem was to implement a well-known Lanchester-type torsional-vibration damper in the hub. Lanchester-type dampers consist in a inertia with two friction elements bonded on its flanks, an apply plate and a retainer ring. However, the inertia of the Lanchester-type damper is by nature very heavy (for instance from 400 g to 600 g depending on the vibration energy to be dissipated).
It is an objective of the invention to provide an improved damper, especially in terms of weight because weight reduction along with efficiency increase and spin loss reduction are the most important factors in order to reduce fuel consumption.
This objective is achieved according to the present invention in that a damper with a support means in form of an open circle is coupled to the hub, a viscoelastic damping material being disposed between the support means and a constraint means.
Such dampers are known from FR 2 664 667 Bi in which a vibration damping system which may be used for instance in gearwheels is described. The support means has the form of an open circle which is elastically deformable. The viscoelastic damping material is placed between the support means and a constraint means which has essentially the same form as the support means. The constraint means is not in contact with the part to be dampened in order to allow shearing of the viscoelastic material. The vibrations are damped by shearing movements in the viscoelastic material. In the present case, the vibration damping system is not used in a wheel but in a hub of a transmission. Although FR 2 664 667 Bi has been published on 17 January 1992, the vibration damping system described therein has only been used in gearwheels or wheels, especially train wheels.
When replacing the current Lanchester-type damper by a torsional damper according to the invention, the damper mass can be significantly reduced (a mass saving of up to 450 g is possible). Furthermore, the damper according to the invention needs much less space than a Lanchester-type damper. A cost saving can also be expected with the vibration damper according to the invention. Finally, vibration dampers according to the invention (which are not common tuned vibration absorbers only capable of suppressing one single resonance) damp a broad frequency band range what is useful when facing a noise concern caused by a stick slip phenomenon within a clutch system.
Generally, the solution according to the present invention could apply to any type of transmission requiring a vibration damper on a rotating component.
According to the invention, a groove is provided in the hub in order to place the damper.
A further advantage of the invention resides in the fact that the damper according to the invention can easily be installed in the hub if the hub is provided with a groove into which the damper is placed.
According to another embodiment of the invention, a coupling area is provided allowing the coupling of the hub to the support means.
In the following, the invention is described with reference to the figures in which FIGURE 1 shows a clutch system in which a squawk noise is generated, FIGURE 2 shows a hub and output carrier shaft assembly before the integration of a damper, FIGURE 3 shows the hub and output carrier shaft assembly of FIGURE 2 with a damper integrated in the hub in a general view and FIGURE 4 shows a detailed view of the damper of FIGURE 3.
FIGURE 1 shows a part of a 6 speed RWD automatic transmission comprising a housing 1, clutch plates 2, a hub 3 and a carrier shaft 4. While applying or releasing the clutch system shown in FIGURE 1, a torsional-vibration mode of the hub and shaft assembly causes the so-called "squawk" noise.
FIGURE 2 shows the output carrier shaft 4. It can be seen that a groove 9 for receiving the damper 8 is provided in the hub 3 FIGURE 3 shows the same output carrier shaft 4 with vibration damper 8 according to the invention placed into the groove 9 of the hub 3.
It can be seen from the detailed view of FIGURE 4 that between a support means 5 in form of an open circle and a constraint means 6 of essentially the same form, a viscoelastic (visco-elastomeric) material 7 is placed. The vibration damper is based on the properties of the visco-elastomeric materials associated to the sandwich structure (multi-layer structure) As can be seen from FIGURES 2 and 4, a groove 9 is provided in the hub 3 in order to fix the vibration damper 8. In this context, it has to be noted that the previously used Lanchester-type vibration damper filled out the whole cavity in which the vibration damper 8 according to the invention is placed. Therefore, the invention does not only allow to save mass, but also better accomodates to design constraints as it requires less room for its installation than other types of dampers.
The support means 5 serving as coupling segment between the hub 3 and the vibration damper 8, it is important that there is a good coupling between the hub 3 and the support means 5 of the vibration damper 8.

Claims (3)

  1. CLAIMS1. An automatic transmission within a housing in which a clutch system, a hub and a shaft are arranged, characterized in that a damper with a support means in form of an open circle is coupled to the hub, a viscoelastic damping material being disposed between the support means and a constraint means.
  2. 2. The automatic transmission of claim 1, wherein a groove is provided in the hub in order to place the damper.
  3. 3. The automatic transmission of claim 1 or of claim 2, wherein a coupling area is provided allowing the coupling of the hub to the support means.
GB0817066A 2008-09-18 2008-09-18 Automatic transmission with viscoelastic damping of clutch Withdrawn GB2463649A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0817066A GB2463649A (en) 2008-09-18 2008-09-18 Automatic transmission with viscoelastic damping of clutch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0817066A GB2463649A (en) 2008-09-18 2008-09-18 Automatic transmission with viscoelastic damping of clutch

Publications (2)

Publication Number Publication Date
GB0817066D0 GB0817066D0 (en) 2008-10-22
GB2463649A true GB2463649A (en) 2010-03-24

Family

ID=39930359

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0817066A Withdrawn GB2463649A (en) 2008-09-18 2008-09-18 Automatic transmission with viscoelastic damping of clutch

Country Status (1)

Country Link
GB (1) GB2463649A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013034861A1 (en) 2011-09-08 2013-03-14 Turbomeca Pinion vibration damping using viscoelastic patch
WO2013034862A1 (en) 2011-09-08 2013-03-14 Turbomeca Pinion vibration damping using viscoelastic patch

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5386894A (en) * 1990-07-12 1995-02-07 Barca; Didier Vibration damping device
US20050183922A1 (en) * 2004-02-20 2005-08-25 Springer James A. Clutch assembly with vibration damper

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5386894A (en) * 1990-07-12 1995-02-07 Barca; Didier Vibration damping device
US20050183922A1 (en) * 2004-02-20 2005-08-25 Springer James A. Clutch assembly with vibration damper

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013034861A1 (en) 2011-09-08 2013-03-14 Turbomeca Pinion vibration damping using viscoelastic patch
WO2013034862A1 (en) 2011-09-08 2013-03-14 Turbomeca Pinion vibration damping using viscoelastic patch

Also Published As

Publication number Publication date
GB0817066D0 (en) 2008-10-22

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)