Borg-Warner Automotive Transmission & Engine Components Corporation

Borg-Warner Automotive Gmbh

Anthony J Grzesiak

David T Vierk

Robert J Fenoglio

Douglas J Slager

Christopher P Puchalla

Allen C Mayhew

Steven P Geary

Darrel Richardson

A transmission band assembly (10) having a circular band (12) and a friction material liner (26). The liner (26) varies in density at predetermined locations along its length to modify the torque curve of the transmission to provide smooth shifting.

Transmission band assembly

The invention provides a double wrap brake band consisting of three band segments which are held together by tie members designed to break-away under shear forces applied by the apply pin and reaction or anchor member during operation of the transmission assembly. The break-away tie members hold the three band segments together to form a structurally sound cylindrical band during assembly of the transmission. The tie segments are then sheared the first time the band is actuated by the apply and reaction pins.

Double wrap brake band with break-away ties

An improved double-wrap brake band having a bracket member (16) consisting of an apply bracket (20), a reaction bracket (22), and a connector bracket (24) secured to three generally parallel bands (12A, 12B, 12C). The bands (12A, 12B, 12C) include a plurality of position oriented non-circular slots (36) designed to accept corresponding non-circular extruded tabs (44) extending from the bracket member (16). Each of the tabs has a longitudinal curvature that is substantially radially parallel to the annular inner peripheral surface (42) of the bracket member (44) and the annular inner peripheral surface (15) of the strap member (10). The tabs (44), after clinching, serve to retain the bracket member (16) securely on the bands (12A, 12B, 12C).

Double-wrap brake band assembly

A transmission brake band (10) for use in automatic transmissions includes strap member (12) with an apply bracket (18) located at one end and a reaction bracket (20) located at the opposed end. The reaction bracket (20) is formed from the strap material as an up-raised dome (36) surrounding the reaction opening (32). The surface of the dome (36) immediately surrounding the reaction opening (32) is substantially planar and perpendicular to a longitudinal axis defined by the reaction opening (32).

Anchor in automatic transmission bands

An improved transmission brake band (10) and a method of forming the same s an improved reaction bracket (20) formed as an upraised dome (36) surrounding a reaction opening (32). An insert member (42), having a volcano-type body (44) integrally formed with a peripheral flange (46) is engaged with the dome (36) and opening (32) so that the body (44) is positioned in the opening (32) and the flange (46) is received by the dome (36).

Method of producing a transmission brake band

The present invention provides for a one-piece band member (10) for use w transmissions. The band member (10) is integrally constructed having the end portions (16) of a strap member (12) being formed an apply member (18) and a reaction member (20) and then folded (22) back over the outer circumference of the strap member (12) to provide a unitary unit. A friction lining (14) is secured around the inner circumference of the strap member (12).

One-piece transmission band

Anchor for automatic transmission bands

A one-piece transmission brake band and the method of forming the same whin the band is an elongated strap with brackets at the opposite ends thereof, the brackets providing an apply end and a reaction end. Each end consists of an end portion of the strap that is folded over upon itself onto the exterior surface of the band and suitably fastened thereto, such as by clinch fastening or spot welding. The apply end of the band has the outer layer provided with a transverse upwardly folded or crimped ridge having a central depression to receive the end of an apply piston, and the reaction end has an outwardly extending radial opening formed by piercing through both layers of material after the end is folded over, with the layers being outwardly extruded in both the radial and circumferential directions. An alternative embodiment utilizes an insert having a cylindrical body with a circumferential base flange. An opening is stamped in the outer layer of material with a raised rim therearound; the opening receiving the cylindrical body and the raised rim receiving the base flange.

Automatic transmission bands

An improved reverse double wrap brake band for the automatic transmission of an automotive vehicle wherein the band is lightweight and heat set round at the released position and utilizes a thinner strap material at higher hardness ranges. The configuration of the double wrap band has a wider central band segment adjacent the anchor portion of the bracket assembly, with the band width tapering over 60 to 70 percent of its length toward the apply end of the band; thus providing a double wrap band of increased durability for the friction lining and increased apply end, drum, and fatigue life.

Growing community of inventors

Sauk Village, IL, United States of America

Anthony J Grzesiak