公开(公告)号：US11486473B2

公开(公告)日：2022-11-01

申请号：US16959291

申请日：2018-01-31

Applicant: BorgWarner Inc.

Inventor： Keith B. Cobb ,  Sean Simmons ,  Kevin Todd

IPC: F16H7/08 ,  F16H7/18

Abstract: A stack of disk springs are placed between a second piston of a dual hydraulic variable force tensioner system and a hydraulic tensioner arm to allow much higher spring rates if desired. The springs may be stacked in multiple configurations to provide different spring rates. Package space can be reduced depending on the number of springs and orientations of said springs within the tensioner arm.

公开(公告)号：US20190316657A1

公开(公告)日：2019-10-17

申请号：US16378873

申请日：2019-04-09

Applicant: BorgWarner Inc.

Inventor： Keith B. Cobb ,  Mark Patton ,  XiaoJian Lu ,  Kevin Todd ,  Dale N. Smith ,  Fabio Magni ,  Ron J. Mielbrecht ,  Glenn Swanson ,  Giuseppe Baddaria

IPC: F16H7/08 ,  F02B67/06 ,  F02F11/00 ,  F01L1/02 ,  F01L1/047

Abstract: A sealed hydraulic tensioner includes a cylinder having a cylinder surface formed in a housing; a piston, received by the cylinder, having an inner surface forming a piston cavity and an outer surface that closely conforms in shape to the cylinder inhibiting the flow of fluid between the outer surface of the piston and the cylinder surface; a tensioner biasing member engaging the piston and the cylinder forcing the piston in an axial direction; a check valve regulating fluid flow between a high-pressure chamber and a low-pressure chamber; one or more apertures formed in the piston extending between the inner surface and the outer surface of the piston that communicate fluid between the piston cavity and the cylinder, wherein a substantially fixed quantity of fluid is encapsulated within the piston cavity and the cylinder.

公开(公告)号：US11448293B2

公开(公告)日：2022-09-20

申请号：US16966320

申请日：2018-02-26

Applicant: BorgWarner Inc.

Inventor： Keith B. Cobb ,  Kevin Todd

IPC: F16H7/08

Abstract: A variable force tensioner (VFT) system that includes a primary piston split into two chambers disposed within a primary bore. The two chambers including a first low pressure chamber having a primary reservoir therein that feeds fluid through a check valve into a second high pressure chamber to control a biasing force on the primary piston. A piston bore clearance path can extend along a groove in the primary bore to feed oil back to the primary reservoir from the high pressure chamber.