Thk Co., Ltd.

Akebono Brake Industry Co., Ltd.

Yoshiaki Saitoh

Hidekazu Michioka

Katsuya Iida

Hiroshi Niwa

Toshifumi Maehara

Takeshi Noda

Katsuhiro Miyata

Yukimasa Mitsude

Takayuki Mukasa

The present invention provides a screw device enabling insulation of sounds occurring from the inside of the screw device when circulating rolling elements. The screw device includes: a screw shafthaving a spiral rolling-element rolling grooveon an outer circumferential surface; a nut bodyhaving a spiral loaded rolling-element rolling grooveon an inner circumferential surface to oppose the rolling-element rolling grooveof the screw shaftand having therein a rolling-element returning passageto return rolling elementsrolling in a loaded rolling-element rolling passageformed between the loaded rolling-element rolling grooveand the rolling-element rolling grooveof the screw shaft; a circulation memberattached to an end face of the nut bodyand provided with a direction changing passageto connect the loaded rolling-element rolling passageand the rolling-element returning passage; and a sound insulating memberattached to the nut bodyto which the circulation memberis attached and formed to have an inner circumferential surface coming into contact with the screw shaft and to cover the circulation member

Screw device with sound insulating member

Provided is a screw device capable of reducing noise generated therefrom. The screw device has a screw shafthaving a rolling-element rolling groovespirally formed on an outer peripheral surface of the screw shaft; a nuthaving a loaded rolling-element rolling groovespirally formed on an inner peripheral surface of the nut and facing the rolling-element rolling grooveof the screw shaftand a rolling-element return path connecting an end of the loaded rolling-element rolling groovewith an other end thereof; and a plurality of rolling elementsarranged in a rolling-element circulation path. A low-noise plateis mounted on a flangeprovided at an axial end of the nutso that the low-noise platecovers at least a part of an end surface of the flange

Low-noise screw device

A cam mechanismprovided as a shoe drive mechanism includes a cam supporting platebeing loosely and rotatably fitted on an anchor pinfor receiving a shoe operating force, a first cam platerotatably connected to the cam supporting plateat an outer cam supporting position which is a position shifted away from the anchor pinradially outwardly of the drum, a second cam platerotatably connected to the cam supporting plateat an inner cam supporting position which is away from the anchor pintoward an operating force generator, so that a pair of brake shoesare opened outwardly by the separate cam plates, respectively.

Drum brake apparatus

Growing community of inventors

Tokyo, Japan

Yoshiaki Saitoh