A hollow spring member and hollow spring member production method can be provided, which can save the time and energy necessary for carburization, thus requiring no dedicated carburizing furnace or the like for carburization, and further can make the interior space of a steel tube a rust-prevention atmosphere. A hollow stabilizer for a vehicle includes a steel tube sealed at one end and another end thereof and a carburizing gas sealed in the interior space of the steel tube.

A decoupler is disclosed for transmitting a drive torque from a rotary drive to a rotary output. The decoupler may include a first spring collar arranged on a drive-part side of a first end of a coil torsion spring and a second spring collar arranged on an output-part side of a second end of the coil torsion spring. The spring collars include axially ascending ramps, and the ends of the coil torsion spring resting thereon widen the coil torsion spring radially with transmission of a drive torque. The ends of the coil torsion spring and the spring collars include reciprocal rotary stops that prevent a relative rotation of the second spring collar with respect to the second coil torsion spring end and of the first coil torsion spring end with respect to the first spring collar.

A power strut includes anisotropic damping device that provides different frictional torque on a rotatable member in response to rotation in opposite rotational directions. The anisotropic damping device includes a shell, the rotatable member, and a torsion spring. The shell includes a through hole, and the rotatable member extends through the through hole and is rotatably connected to the shell. The torsion spring is sleeved on the rotatable member and is in interference fit with the rotatable member, and the torsion spring is provided with a first leg fixedly connected to the shell. The rotatable member may include a shaft sleeve fixed to a rotating shaft, with the torsion spring in interference fit with the shaft sleeve.

The invention relates to a stabilizer assembly of a two-track vehicle for stabilizing a rolling movement, the stabilizer assembly being operable on at least two different spring characteristics, comprising a first and a second stabilizer half, each coupled to a wheel of the vehicle, wherein the first and the second stabilizer halves are coupled such that they can rotate relative to each other about their longitudinal axis by means of a spring element, whereby the stabilizer is operable with a first spring characteristic, and wherein the first and the second stabilizer halves can be hydraulically coupled such that they can rotate relative to each other about their longitudinal axis by means of a hydraulic actuator, whereby the stabilizer is operable using at least one second spring characteristic. The actuator comprises at least two work chambers which are filled with a hydraulic medium and coupled to each other by a fluid-conducting connection, and the actuator comprises a transmission unit which is designed such that a rotational movement of the stabilizer halves can be converted into a translational movement of an intermediate element arranged between the two work chambers, and a volume flow of the hydraulic medium from the one work chamber into the other work chamber can thus be produced.

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 torsional damper for a torque transmission device, comprising: a rotationally movable first element (102) and second element (103); and an elastically deformable blade (117a, 117b) integral with one of the first and second elements; an abutment element (121) carried by the other of the first and second elements and configured to interact with the blade in such a way that for an angular deflection between the first and second elements with respect to an inactive angular position, the abutment element applies a flexural load onto the blade, producing jointly a reaction force capable of returning the first and second elements to the inactive angular position, blade has an inner arm (132) and an outer arm (134) connected by a bend (133), the inner arm being situated radially between the outer arm and a rotation axis.

A method includes, providing a tubular member (10) used for a hollow spring, and applying the compressive residual stress to at least a portion of an inner surface of the steel tube by applying the compressive force to at least a portion of an outer surface of the tubular member (10) from a circumferential direction, and a fatigue life of the tubular member (10) is prolonged by applying the compressive residual stress to the inner surface of the tubular member (10). Applying the force to the outer surface of the tubular member (10) includes pressing the tubular member (10) with a die (1). The die (1) has a pressing surface (1a) shaped such that the compressive force can be applied to at least the portion of the outer surface of the tubular member (10) from the circumferential direction.

A ring gear arrangement, including: a ring gear mount including: a ring gear having at least one internal gear for interaction with one or more gear wheels; a ring gear stator; and, a plurality of couplings which locate the ring gear within the gear stator, each coupling having a drive arm connected to the ring gear and a resiliently deformable connection, wherein the drive arm is movable between a first position in which the ring gear is in a rest position and a second position in which the ring gear has undergone some radial or rotational movement relative to the ring gear stator, wherein movement of the drive arm from a the first position to the second position loads the resiliently deformable connection against the ring gear, wherein the resiliently deformable connection biases the drive arm to return to the first position when in the second position.

A torsional vibration damper has a hub part, also referred to as primary mass, which can be fastened on a drive shaft of an engine, and an inertia ring, also referred to as secondary mass, which surrounds the hub part in the radially outer region. A damping device is provided between the hub part and the inertia ring. The torsional vibration damper includes an additional torsion spring, wherein the additional torsion spring is axially aligned.

The plane torsion spring has an inner fastening point, at least two outer fastening points, and at least two spring arms. Each of the at least two spring arms connects the inner fastening point to one of the outer fastening points in a spring-elastic manner. The spring arms have a similar contour and extend symmetrically, preferably point-symmetrically, with respect to the inner fastening point. The spring arms of the plane torsion spring have an S-shaped profile.