Abstract: The lock-up device includes: a clutch part disposed between a front cover and a turbine; and a damper mechanism for transmitting torque from the clutch part to the turbine and for absorbing and attenuating a torsional vibration. The damper mechanism includes: an input plate into which torque is inputted from the clutch part; an output plate connected to the turbine; a plurality of torsion springs; an intermediate member; and a restriction member. The intermediate member is rotatable relatively to the input plate and the output plate, and causes two torsion springs to act in series. The restriction member is mounted to the input plate, and restricts the intermediate member from moving in both of an axial direction and a radial direction.

Abstract: It is an object of the present invention to provide a lock-up device for a fluid coupling that can reliably suppress vibration caused by coil springs. It is to provide a lock-up device for a fluid coupling that can reliably suppress vibration caused by coil springs. This lock-up device (7) is equipped with an input rotation member (30) and (31), an output rotation member (35), plural first elastic members (32), and a float member (42). The first elastic members (32) are compressed in a rotational direction by the relative rotation of the input rotation member and the output rotation member. The float member (42) is placed in such a way as to be rotatable relative to the input rotation member (30) and (31) in order to cause two of the first elastic members (32) to act in series in a circumferential direction.

Abstract: An axial-direction space can be made more compact while widening a damper twisting angle of a lockup device such that a damper characteristic can be further improved. This torque converter comprises a torque converter main body and a lockup device. The lockup device has a plurality of outer peripheral-side torsion springs and a plurality of inner peripheral side torsion springs. The outer peripheral-side torsion springs are arranged along a circumferential direction at an attachment diameter. The inner peripheral-side torsion springs are arranged along a circumferential direction at a second attachment diameter radially inward of the outer peripheral torsion springs and operate in series with the outer peripheral torsion springs. Also, the attachment diameter is equal to or larger than an outer diameter of a torus, and the attachment diameter is equal to or smaller than an inner diameter of the torus.

Abstract: The lockup device includes a piston that is coupled to a front cover, a drive plate coupled to the piston, a plurality of outer peripheral-side torsion springs to which torque is inputted from the drive plate, and a float member that is arranged on the turbine side of the outer peripheral-side torsion springs and serves to make two of the outer peripheral-side torsion springs operate in series The float member has a main body portion and an inner peripheral support portion. The main body portion covers an outer peripheral portion and a turbine-side side portion of the outer peripheral-side torsion springs. The inner peripheral support portion extends from the main body section toward an inner periphery and supported on an output side of the intermediate member.

Abstract: It is an object of the present invention to achieve reduction in size and weight of, and inhibition of axial size increase of, a power transmission device for a torque converter including a turbine functioning as an inertia element. The power transmission device includes a torque transmission plate fixed to a turbine, a damper mechanism disposed between a front cover and the turbine, and an engaging part. The damper mechanism elastically couples the torque transmission plate and a transmission-side member. The engaging part couples the torque transmission plate and the damper mechanism on a radially inner side of a torus center C of a torque converter main body.

Abstract: A lock-up device includes a piston, a drive plate, a plurality of radial outer side torsion springs, a float member, a driven plate, a plurality of radial inner side torsion springs and an intermediate member. The float member is configured to rotate relative to the drive plate, to cause the first and second radial outer side elastic members to act in series. The intermediate member is configured to rotate relative to the drive plate and the driven plate, and to transmit the torque from the first and second radial outer side elastic members to the first and second radial inner side elastic members.

Abstract: A waveguide portion has a waveguide with a rectangular section surrounded by a pair of narrow side plates opposed to each other, a pair of broad side plates extending along lengthwise directions of the pair of narrow side plates. A radiation portion is provided on one broad side plate of the pair of broad side plates of the waveguide portion, and has a plurality of slots for radiating an electromagnetic wave input into the waveguide portion externally from the one broad side plate. The waveguide portion includes a first waveguide member and a second waveguide member, and is constituted by joining the first waveguide member and the second waveguide member at edge portions extending in longitudinal directions thereof matching with central lines of the pair of broad side plates. The plurality of slots of the radiation portion has a first group of slots and a second group of slots defined respectively in the first waveguide portion and the second waveguide portion at predetermined intervals in a staggered manner.

Abstract: A waveguide portion has a waveguide with a rectangular section surrounded by a pair of narrow side plates opposed to each other, a pair of broad side plates extending along lengthwise directions of the pair of narrow side plates. A radiation portion is provided on one broad side plate of the pair of broad side plates of the waveguide portion, and has a plurality of slots for radiating an electromagnetic wave input into the waveguide portion externally from the one broad side plate. The waveguide portion includes a first waveguide member and a second waveguide member, and is constituted by joining the first waveguide member and the second waveguide member at edge portions extending in longitudinal directions thereof matching with central lines of the pair of broad side plates. The plurality of slots of the radiation portion has a first group of slots and a second group of slots defined respectively in the first waveguide portion and the second waveguide portion at predetermined intervals in a staggered manner.

Abstract: The present invention provides a dielectric leaky-wave antenna having a single-layer structure which is effective for realizing a highly efficient low-cost antenna in a quasi-millimeter wave zone in particular. This dielectric leaky-wave antenna includes a ground plane, a dielectric slab which is laid on one surface of the ground plane and forms a transmission guide for transmitting an electromagnetic wave from one end side to the other end side between itself and the ground plane along the surface, perturbations which are loaded on the surface of the dielectric slab along the electromagnetic wave transmission direction of the transmission guide at predetermined intervals and leak the electromagnetic wave from the surface of the dielectric slab, and a feed which supplies the electromagnetic wave to one end side of the transmission guide.

Abstract: The present invention provides a dielectric leaky-wave antenna having a single-layer structure which is effective for realizing a highly efficient low-cost antenna in a quasi-millimeter wave zone in particular. This dielectric leaky-wave antenna includes a ground plane, a dielectric slab which is laid on one surface of the ground plane and forms a transmission guide for transmitting an electromagnetic wave from one end side to the other end side between itself and the ground plane along the surface, perturbations which are loaded on the surface of the dielectric slab along the electromagnetic wave transmission direction of the transmission guide at predetermined intervals and leak the electromagnetic wave from the surface of the dielectric slab, and a feed which supplies the electromagnetic wave to one end side of the transmission guide.

Abstract: A dielectric slab is arranged on one surface of a ground plane to form a transmission guide for transmitting an electromagnetic wave along the surface from one end to the other end between the dielectric slab and the ground plane. A perturbation is loaded on the dielectric slab to leak the electromagnetic wave from the surface of the dielectric slab. A feed supplies an electromagnetic wave to one end of the transmission guide formed by the ground plane and dielectric slab. A dielectric layer is interposed between the ground plane and the dielectric slab, and has a lower permittivity than that of the dielectric slab.

Abstract: A dielectric slab is arranged on one surface of a ground plane to form a transmission guide for transmitting an electromagnetic wave along the surface from one end to the other end between the dielectric slab and the ground plane. A perturbation is loaded on the dielectric slab to leak the electromagnetic wave from the surface of the dielectric slab. A feed supplies an electromagnetic wave to one end of the transmission guide formed by the ground plane and dielectric slab. A dielectric layer is interposed between the ground plane and the dielectric slab, and has a lower permittivity than that of the dielectric slab.