Automotive disc brake squeal

This paper reviews numerical methods and analysis procedures used in the study of automotive disc brake squeal. It covers two major approaches used in the automotive industry, the complex eigenvalue analysis and the transient analysis. The advantages and limitations of each approach are examined. This review can help analysts to choose right methods and make decisions on new areas of method development. It points out some outstanding issues in modelling and analysis of disc brake squeal and proposes new research topics. It is found that the complex eigenvalue analysis is still the approach favoured by the automotive industry and the transient analysis is gaining increasing popularity.

Numerical analysis of automotive disc brake squeal: a review

The invention is directed to a multiple-clutch device, such as a double-clutch device, for arranging in a drivetrain of a motor vehicle between a drive unit and a transmission, wherein the clutch device has a first clutch arrangement associated with a first transmission input shaft of the transmission and a second clutch arrangement associated with a second transmission input shaft of the transmission for transmitting torque between the drive unit and the transmission. According to one aspect of the invention, it is suggested that plates in a plate stack of a clutch arrangement constructed as a plate clutch arrangement which have at least one friction facing can be brought into frictional engagement with plates having no friction facing, wherein at least one of the plates not having a friction facing is thicker in axial direction than friction facing carrying elements of adjacent plates having at least one friction facing. Alternatively or in addition, it is suggested that at least one plate which has at least one friction facing of sintered material and at least one plate which has at least one friction facing made of another friction facing material are provided in the plate stack, wherein the other friction facing material has a progressive frictional coefficient curve (dλ/dΔN) in relation to a slip speed (ΔN).

Multiple clutch device

A controllable selectable one-way clutch is provided for use within a hybrid transmission. The clutch comprises an outer and inner race, and a first and second selector plate. A transmission motor controller synchronizes the speeds of the races to facilitate application and release of the clutch, and a transmission controller communicates a signal to the clutch for re-positioning of the plates to apply and release the clutch. The clutch has three operational modes, including freewheeling and holding torque in one direction or both directions. A method is also provided for applying a selectable one-way clutch in a vehicle having a hybrid transmission with a motor controller and a transmission controller, including synchronizing the clutch speed using the motor controller, detecting the direction of the race speed difference, communicating the race speed difference to the transmission controller, and selecting between the clutch operational modes in response to the detected speed difference.

Selectable one-way clutch

A planetary gear train may include an input shaft, an output gear adapted to output a shifted torque, a first compound planetary gear set having four rotation elements by combining first and second planetary gear sets, a second compound planetary gear set having four rotation elements by combining third and fourth planetary gear sets, eight rotation shafts including two rotation elements connected to each other or one rotation element among the rotation elements of the first and second compound planetary gear sets, and six friction members including three clutches interposed between a selected rotational shaft among the rotational shafts and the input shaft and adapted to selectively transmit the torque and three brakes interposed between a selected rotational shaft among the rotational shafts and a transmission housing.

Planetary gear train of automatic transmission for vehicles

A selectable one-way clutch includes a strut plate co-annular to a slide plate and a notch plate The selectable one-way clutch is configured to transfer torque between a strut plate and a notch plate in a first direction when a displacement actuator moves a pin and a slide plate to a first position The selectable one-way clutch is configured to disengage the strut plate from the notch plate when the displacement actuator moves the pin and the slide plate to the second position

Method and apparatus for controlling a selectable one-way clutch in an electro-mechanical transmission

A multi-speed transmission is provided with a selectable (reversible) braking one-way clutch operative to brake rotation of a member of a planetary gear set of the transmission when the transmission is in reverse and first speed. First and second rotating input clutches are slipped when the vehicle is launched in reverse or first speed. The transmission is preferably characterized by the absence of a torque converter, but the invention may be implemented with a torque converter if desired.

Transmission with selectable braking one-way clutch

A selectable one-way clutch (SOWC) is provided for use with a vehicle transmission, and has a first race with a plurality of strut pockets, a moveable selector plate, symmetrical torque-holding elements or struts, and a second race that is rotatably engageable with a torque input device. The selector plate has a plurality of windows, and the struts selectively prevent rotation of the second race in either rotational direction depending on the position of the selector plate. The struts have a cylindrical portion and a pair of strut wings each having a free end. The strut wings connect to the cylindrical portion, and a different one of the free ends engages a strut pocket when an opposite strut wing is depressed in order to prevent rotation of the second race.

Selectable one-way clutch with symmetrical struts

A torque transfer device embodying the concepts of the present invention utilizes a plurality of first apply torque plates and a plurality of second reaction torque plates. Each torque plate has a generally flat annular disk portion, and passages penetrate the flat disk portion of the torque plates. The disk portions of the first and second torque plates are interleaved, and an annular friction disk is interposed between the successively adjacent interleaved disk portions. Circumferentially spaced and annularly disposed apertures penetrate each friction disk. The passages in the flat disk portion of the first and second torque plates are located in register with the apertures penetrating the friction disks. Each friction disk may have a planar reverse surface that is attached to the disk portion of one torque plate. Each friction disk also has an obverse engaging face operatively to engage the successively adjacent disk portions. An annular channel is provided in the obverse engaging face of each friction disk, and the apertures are located within the channel. A plurality of circumferentially spaced recesses extend radially of the obverse engaging surface to intersect the channel.

Controlled cooling apparatus for torque transfer devices

A SOWC for use with a vehicle transmission is provided. The clutch includes outer and inner elements, also referred to as races, with the latter oriented concentrically within the former about an axis of rotation. A selection mechanism, which may be annular plates operatively connected with the side of the races and with one another, is selectively rotatable with respect to the inner and outer elements between different positions. Pivotable rocker elements are positioned between the races and are movable along cammed slots of the annular plates when the annular plates are rotated to establish a forward, a reverse, and a neutral operating mode corresponding with the different positions of the annular plates. In some embodiments, in the neutral operating mode, none of the rocker elements are in contact with the inner race.

Farzad Samie

Papers

Method and apparatus for controlling a selectable one-way clutch in an electro-mechanical transmission

Transmission with selectable braking one-way clutch

Selectable one-way clutch with symmetrical struts

Controlled cooling apparatus for torque transfer devices

Rocker-Type Selectable One-Way Clutch With Neutral Position