A propeller shaft with a variable stiffness bushing is disclosed. The propeller shaft includes a first shaft and a second shaft, each of the first shaft and the second shaft having a first end and a second end, the second end of the first shaft coupled to the first end of the second shaft with a joint and a variable stiffness bushing assembly coupled to one of the first and the second shafts near the joint, the variable stiffness bushing assembly having a bearing, a bearing support encircling the bearing, a chamber formed in the bearing support, and at least one electric field generator, wherein the chamber contains a magnetorheological fluid.

A propeller shaft with a variable stiffness bushing is disclosed. The propeller shaft includes a first shaft and a second shaft, each of the first shaft and the second shaft having a first end and a second end, the second end of the first shaft coupled to the first end of the second shaft with a joint and a variable stiffness bushing assembly coupled to one of the first and the second shafts near the joint, the variable stiffness bushing assembly having a bearing, a bearing support encircling the bearing, a chamber formed in the bearing support, and at least one electric field generator, wherein the chamber contains a magnetorheological fluid.

Workpieces that generate pressure by an extrusion media (6, 6a) and are deformed in this way for the secure connection of components (7, 8). In particular, an extrusion billet which comprises an extrudable material or material mixture in the interior thereof, which can be reversibly compressed by a compression die (4) penetrating into the material, such that billet can expand in diameter by increasing the internal pressure in the billet, which leads to a very secure, but reversible press fitting of the different types of components to be connected, in particular of shaft-hub connections for mechanical engineering.

A hydraulic system includes a motor. A brake is to be actuated by an operation fluid to brake the motor when a hydraulic pressure is relieved and to release the braking when the hydraulic pressure is applied. A switch valve is to be switched to a first position and to a second position, the first position being provided for relieving the hydraulic pressure from the brake, the second position being provided for applying the hydraulic pressure to the brake. A first fluid tube is to connect the switch valve and the brake. A second fluid tube is connected to the first fluid tube at a connecting portion and communicated with a tank A first throttle is disposed on the second fluid tube. A second throttle is disposed on the first fluid tube and on an upstream side between the connecting portion and the switch valve.

A hydraulic system includes a motor. A brake is to be actuated by an operation fluid to brake the motor when a hydraulic pressure is relieved and to release the braking when the hydraulic pressure is applied. A switch valve is to be switched to a first position and to a second position, the first position being provided for relieving the hydraulic pressure from the brake, the second position being provided for applying the hydraulic pressure to the brake. A first fluid tube is to connect the switch valve and the brake. A second fluid tube is connected to the first fluid tube at a connecting portion and communicated with a tank A first throttle is disposed on the second fluid tube. A second throttle is disposed on the first fluid tube and on an upstream side between the connecting portion and the switch valve.

An attachment system of a wearable electronic device includes a removable module. The removable module includes a locking mechanism comprising a first portion having a substantially planar top surface and second portion that comprises a substantially non-planar bottom surface. The first portion and the second portion are coupled together. The locking mechanism also includes a first spring mechanism coupled between the first portion and the second portion. The first spring mechanism causes the first portion to be biased away from the second portion. The locking mechanism also includes a second spring mechanism. The second spring mechanism causes the substantially planar top surface of the first portion to be biased substantially flush with respect to the removable module and also causes the substantially non-planar bottom surface of the second portion to be biased proud with respect to the removable module.

A continuously variable transmission housing is provided that includes an inner cover and an outer cover connectable to the inner cover to define an interior chamber. The interior chamber is structured and operable to enclose a continuously variable transmission primary pulley, secondary pulley and pulley belt. The housing includes a duct panel mounted to the inner cover such that when the primary pulley is disposed within the interior chamber, the duct panel is disposed between an outer face of the primary pulley and the inner cover. Moreover, an air duct is defined between the inner cover and the duct panel, wherein the air duct is fluidly connected to ambient air from an ambient environment external to the housing. The duct panel includes a center opening that structured and operable to allow the ambient air to be drawn through the air duct and into the housing interior chamber.

Various examples of simultaneous ocean wave and current energy harvesting are described, using a hybrid ocean energy converter and a mechanical transfer system therefor. In one example, a hybrid ocean energy converter includes a two-body point absorber comprising a first body and a second body. The two-body point absorber can be configured to transfer a linear relative motion between the first body and the second body to bi-directional rotation of a first input shaft. A turbine can be configured rotate a second input shaft. The converter further includes a hybrid power takeoff including a mechanical transfer system configured to mechanically couple the first input shaft, the second input shaft, an output shaft, and an output shaft.

Various examples of simultaneous ocean wave and current energy harvesting are described, using a hybrid ocean energy converter and a mechanical transfer system therefor. In one example, a hybrid ocean energy converter includes a two-body point absorber comprising a first body and a second body. The two-body point absorber can be configured to transfer a linear relative motion between the first body and the second body to bi-directional rotation of a first input shaft. A turbine can be configured rotate a second input shaft. The converter further includes a hybrid power takeoff including a mechanical transfer system configured to mechanically couple the first input shaft, the second input shaft, an output shaft, and an output shaft.

A method and apparatus for a vehicle suspension system gas spring. In one embodiment, a vehicle suspension system gas spring includes a compressible main gas chamber and an additional volume combinable with the main chamber to change a gas spring rate of the system. In one embodiment, a low friction piston seal is created by a flexible seal member.