A torsion bar is provided that is easy, quick, and cost effective to manufacture. The torsion bar may extend along an axis and have a first end and a second end that is spaced from the first end. The torsion bar may have an active section positioned between the first and second ends. The active section may also have a length defined along the axis. A cross-section transverse to the axis may define a contour of the torsion bar where the contour may be uniform along the length of the active section. The contour may define at least one of a polygon and a polygon-like shape.

A torsion spring that is used in a throttle valve device increasing and decreasing an opening degree of an intake passage or an exhaust passage of an internal-combustion engine includes: two coil springs connected with each other so that torsion directions are opposite from each other; and a hook disposed between the two coil springs. Of the two coil springs, one side spring arranged at one side in an axial direction biases a valve object to a closing side, and the other side spring arranged at the other side in the axial direction biases the valve object to an opening side. In at least one coil spring of the two coil springs, a dimension of a clearance between the at least one coil spring and the hook connected with each other is larger than an average value of clearances between coil turns of the at least one coil spring.

A wind turbine is provided, including a container, a fluid which is arranged inside the container, and a damping body which is arranged inside the container, which is immersed in the fluid, and which is configured to move inside the container, wherein the fluid and the damping body are configured to damp oscillations of the wind turbine. A damper system is provided that on the one hand the fluid damps, e.g. by sloshing, and on the other hand the damping body damps by moving at least partially through the fluid.

The present disclosure provides a thin-walled tube filled with a mixed Poisson ratios, including at least one PPR filling strip, at least one NPR filling strip, and a thin-walled tube body with a porous structure, where each hole of the thin-walled tube body is filled with the PPR filling strip or the NPR filling strip; the PPR filling strip includes a plurality of PPR cells that are connected in sequence, and the PPR cells each are prepared from a PPR metamaterial; the NPR filling strip includes a plurality of NPR cells that are connected in sequence, and the NPR cells each are prepared from an NPR metamaterial. In the present disclosure, the thin-walled tube can simultaneously have a longer effective compression stroke of the NPR metamaterial and a higher compression force platform of the PPR metamaterial, thereby greatly improving the impact resistance and energy absorption capacity of the tube structure.

An illustrative example spring includes a curved shape body having a length. The body includes a cavity that extends along at least a majority of the length. The body has a cross-section across the length that is different at a plurality of locations on the body along the length.

A device for damping vibrations suffered by a cable and intended to be integrated into a recess for the cable that has a larger cross- section than the cross-section of the cable. The device has at least two tips with tubular cross-sections that are attached to the surface of the cable and a flexible portion connecting the tips together and extending to the interior wall of the recess.

The present invention relates to the field of transport mechanical engineering.

Objectimprove performance and operational reliability of a friction shock absorber.

The friction shock absorber (FIG. 2) comprises housing (1), whose walls form orifice (2), and bottom (4) that is in contact with return-and-retaining device (5) contacting a friction assembly that consists of the following elements fitted out with friction surfaces (f1-f10): supporting plate (10), pressure wedge (6), stay wedges (7), and reverse-U-shaped movable plates (9) fitted out with side shelves (14) that cover guide plates (8) and are located on supporting plate (10). Return-and-retaining device (5) is available between the guide plates. Additional return-and-retaining device (11) is available between the pressure wedge and the supporting plate.

Recesses for the return-and-retaining device and hard lubricant inserts are available on the guide plates;

Movable plates may be partially T-shaped forming side shelves that are located on the supporting plate.

Hooks (15, 16) are available on the pressure wedge and stay wedges, located so as to enable a mutual contact during the back stroke of the pressure wedge.

A gas spring and gas damper assembly includes a gas spring and a gas damper. The gas spring includes a flexible spring member with opposing end members secured thereto and at least partially defining a spring chamber. The gas damper includes an inner sleeve that is at least partially received within one of the end members and at least partially forms a damping chamber. A damper piston assembly is received within the damping chamber and secured to the other of the end members. An elongated damping passage fluidically connects the damping chamber and the spring chamber. Suspension systems and methods are also included.

An example flywheel energy storage device includes a fiber-resin composite shell having an elliptical ovoid shape. The example device also includes an axially oriented internal compressive support between the axial walls of the shell. The example device also includes an inner boss plate and an outer boss plate on each side of the shell. The example device also includes a plurality of radially oriented, fiber-resin composite helical wraps forming the shell and coupling the shell to the inner and outer boss plates for co-rotation and torque transfer. The example device also includes boss plate attachments on internal boss plate supports to mount the shell for co-rotation and torque transfer via resin bonding, friction, and compression between the inner and outer boss plates.

A torsion spring that is used in a throttle valve device increasing and decreasing an opening degree of an intake passage or an exhaust passage of an internal-combustion engine includes: two coil springs connected with each other so that torsion directions are opposite from each other; and a hook disposed between the two coil springs. Of the two coil springs, one side spring arranged at one side in an axial direction biases a valve object to a closing side, and the other side spring arranged at the other side in the axial direction biases the valve object to an opening side. In at least one coil spring of the two coil springs, a dimension of a clearance between the at least one coil spring and the hook connected with each other is larger than an average value of clearances between coil turns of the at least one coil spring.