Abstract: A body motion sensor according to the present disclosure includes one or a plurality of detecting units which is placed in a casing attachable so as to be in contact with a body, and which is capable of detecting a body situation, and a control unit capable of controlling a transmission of information to an external device based on a detection signal from the detecting unit. The detecting unit includes at least an optical sensor. The control unit determines a contact state of the casing with the body of a wearing person in accordance with the detection signal from the optical sensor, and decides an information content to be transmitted to the external device based on the detection signal from the detecting unit in accordance with a determination result.

Abstract: A fastener according to the present disclosure includes a main unit, an adjuster unit which extends from the main unit and which is capable of being elastically inflected, and a cover unit coupled to the main unit through the adjuster unit. The cover unit is configured to be, by elastic flection of the adjuster unit, both in a state apart from the main unit and in a state latched with the main unit so as to cover the main unit, and with the cover unit being in the state latched with the main unit, a side surface of the main unit and a surface of the adjuster unit are apart from each other, the surface of the adjuster unit facing the side surface.

Abstract: A differential device includes a ring gear receiving a rotational driving force from a drive gear, a differential case rotating integrally with the ring gear around a predetermined axis, and a differential mechanism installed within a barrel part of the differential case. The ring gear includes a gear portion meshing with the drive gear, and a rim portion that is formed integrally with an inner periphery of the gear portion and is fitted, in a non-welded state, onto a maximum diameter outer peripheral portion of the barrel part or a predetermined outer peripheral portion having a smaller diameter than the maximum diameter outer peripheral portion. The rim portion has a to-be-fixed portion welded to the barrel part at a position spaced in an axial direction from a fitting part via which the rim portion and the barrel part are fitted, the position being further radially inward than the fitting part.

Abstract: A differential device includes a ring gear receiving a rotational driving force from a drive gear, a differential case rotating integrally with the ring gear around a predetermined axis, and a differential mechanism installed within a barrel part of the differential case. The ring gear includes a gear portion meshing with the drive gear, and a rim portion that is formed integrally with an inner periphery of the gear portion and is fitted, in a non-welded state, onto a maximum diameter outer peripheral portion of the barrel part or a predetermined outer peripheral portion having a smaller diameter than the maximum diameter outer peripheral portion. The rim portion has a to-be-fixed portion welded to the barrel part at a position spaced in an axial direction from a fitting part via which the rim portion and the barrel part are fitted, the position being further radially inward than the fitting part.

Abstract: In a differential device including a differential case having a case main body with an access window, a flange part includes: a first flange part outside a region sandwiched by paired imaginary straight lines passing through an axis and inner ends, on one and another sides in a peripheral direction of the case, of the window when viewed on a projection plane orthogonal to the axis; and the second flange part in the region. The second flange part includes a predetermined region spaced in the peripheral direction from a border part with the first flange part and capable of avoiding stress concentration around a degassing passage in the predetermined region when a thrust load acts on the flange part so as to generate stress resisting inclination thereof. The degassing passage is disposed only in the first flange part, only in the predetermined region, or only in both of them.

Abstract: In a differential device including a differential case having a case main body with an access window, a flange part includes: a first flange part outside a region sandwiched by paired imaginary straight lines passing through an axis and inner ends, on one and another sides in a peripheral direction of the case, of the window when viewed on a projection plane orthogonal to the axis; and the second flange part in the region. The second flange part includes a predetermined region spaced in the peripheral direction from a border part with the first flange part and capable of avoiding stress concentration around a degassing passage in the predetermined region when a thrust load acts on the flange part so as to generate stress resisting inclination thereof. The degassing passage is disposed only in the first flange part, only in the predetermined region, or only in both of them.

Abstract: In a transmission device, a flange portion includes: first outer peripheral portion fitted and welded to inner peripheral portion of ring gear; second outer peripheral portion small in diameter and adjacent to the first outer peripheral portion via first connecting surface; and third outer peripheral portion smaller in diameter and adjacent to the second outer peripheral portion on the opposite side from the first outer peripheral portion via second connecting surface. The ring gear includes space forming portion defining, between it and the flange portion, space faced by inner end of welded portion and extending radially inward and outward of the welded portion. Side surface of the stopper portion abuts against the second connecting surface, the stopper portion being formed in the ring gear and having inner peripheral surface press-fitted to the third outer peripheral portion.

Abstract: A differential device includes: a differential gear mechanism; and an integrated differential case housing the mechanism, the differential case including bearing bosses formed integrally on one and other side portions thereof and aligned on a same axis to be rotatably supported by a transmission case; a work window being provided in the differential case; sleeves rotatably supported by the bosses and connected to side gears of the mechanism liquid-tightly. The sleeves can be passed through an inside of the differential case from the window and fitted and inserted to inner peripheries of the bosses, falling-off prevention devices are provided between the sleeves and the bosses, and seal devices for preventing lubricating oil in the differential case from flowing out are provided between the side gears and the sleeves. Accordingly, when drive shafts are removed from the differential device, the oil in the transmission and differential cases does not flow out.

Abstract: In a differential device where sleeves passing through a differential case are connected with side gears and a washer is disposed between a back face of the side gear and an inner surface of the case facing each other, at least one of the side gears includes a shaft portion extending axially outwardly from the back face, the shaft portion and an inner peripheral surface of the sleeve being coupled together through a press-fit coupling. The one side gear has a washer support portion at a root of the shaft portion, the washer support portion having an outer peripheral surface in which an inner peripheral portion of the washer is fitted, and having an axial end face against which an end face on a front side in a press-fitting direction of the sleeve abuts or which the end face faces across a gap smaller than a thickness of the washer.

Abstract: In a differential device distributing rotational force acting on a differential case to a pair of output shafts, the differential case including an input member and a cover portion, assembling precision of the differential device is enhanced by suppressing strain due to welding and press-fitting. The input member includes: a welded portion fitting the cover portion in axial direction and joined by welding; a press-fitted portion located inward of the welded portion in radial direction and axial direction and press-fitted to the cover portion; and a connecting surface connecting the welded portion and the press-fitted portion and forming a space between the connecting surface and the cover portion, the space allowing deformation of the press-fitted portion during press-fitting. The connecting surface includes one end portion continuous to the welded portion and extending outward from the welded portion in radial direction.

Abstract: A differential device includes: a differential gear mechanism; and an integrated differential case housing the mechanism, the differential case including bearing bosses formed integrally on one and other side portions thereof and aligned on a same axis to be rotatably supported by a transmission case; a work window being provided in the differential case; sleeves rotatably supported by the bosses and connected to side gears of the mechanism liquid-tightly. The sleeves can be passed through an inside of the differential case from the window and fitted and inserted to inner peripheries of the bosses, falling-off prevention devices are provided between the sleeves and the bosses, and seal devices for preventing lubricating oil in the differential case from flowing out are provided between the side gears and the sleeves. Accordingly, when drive shafts are removed from the differential device, the oil in the transmission and differential cases does not flow out.

Abstract: A differential device includes: a differential gear mechanism; and an integrated differential case housing the mechanism, the differential case including bearing bosses formed integrally on one and other side portions thereof and aligned on a same axis to be rotatably supported by a transmission case; a work window being provided in the differential case; sleeves rotatably supported by the bosses and connected to side gears of the mechanism liquid-tightly. The sleeves can be passed through an inside of the differential case from the window and fitted and inserted to inner peripheries of the bosses, sleeve retainers are provided between the sleeves and the bosses, and seal devices for preventing lubricating oil in the differential case from flowing out are provided between the side gears and the sleeves. Accordingly, when drive shafts are removed from the differential device, the oil in the transmission and differential cases does not flow out.

Abstract: In a differential device and a method of manufacturing it, a press-fit regulation device regulating a press fit depth of the flange and the ring gear is provided in a press-fit portion between the flange and the ring gear, the flange includes thin-walled portions with recessed portions and thick-walled portions without the recessed portions, the thick-walled portions and the ring gear are welded from a second bearing boss side to a predetermined weld depth, and the thin-walled portions and the ring gear are welded from the second bearing boss side to a weld depth shallower than the predetermined weld depth or not welded. Accordingly, the press-fit portion between the flange and the ring gear can be efficiently welded even in a case where work windows of a differential case cut into a side surface of the flange on a first bearing boss side to form the recessed portions.

Abstract: In a transmission device, a flange portion includes: first outer peripheral portion fitted and welded to inner peripheral portion of ring gear; second outer peripheral portion small in diameter and adjacent to the first outer peripheral portion via first connecting surface; and third outer peripheral portion smaller in diameter and adjacent to the second outer peripheral portion on the opposite side from the first outer peripheral portion via second connecting surface. The ring gear includes space forming portion defining, between it and the flange portion, space faced by inner end of welded portion and extending radially inward and outward of the welded portion. Side surface of the stopper portion abuts against the second connecting surface, the stopper portion being formed in the ring gear and having inner peripheral surface press-fitted to the third outer peripheral portion.

Abstract: In a method of manufacturing a differential device, a hub of a ring gear is press-fitted to a flange from a first bearing boss side, then a press-fit portion between the flange and the ring gear is equally divided into a plurality of divided regions arranged along a peripheral direction, and simultaneously the divided regions are welded. Accordingly, the press-fit portion between the flange and the ring gear can be efficiently welded while welding distortion of the ring gear is eliminated or reduced even in a case where work windows of a differential case cut into a side surface of the flange on the first bearing boss side to form recessed portions.

Abstract: In a differential device, an outer tube portion is formed in one of a side gear and a sleeve, and an inner tube portion fitted to an inner periphery of the outer tube portion is formed in the other. An engagement portion is provided in the outer tube portion. A key member movable between a first position where the member is detached from the engagement portion to allow withdrawal of the sleeve and a second position where the member is engaged with the engagement portion, is attached to the inner tube portion. The member is forcibly held at the second position by a drive shaft when the shaft is fitted and inserted into the sleeve to be spline-fitted to the gear. Accordingly, a differential gear mechanism is disassembled by removing the sleeves from the gears and when the shafts are attached, connection between the sleeves and the gears is ensured.

Abstract: To prevent decrease in assembling precision of the differential device and enable avoiding decrease in transmission efficiency even when a tooth portion is formed in an outer peripheral portion of an input member. The differential device includes: a differential case; and a differential mechanism housed in the differential case and distributively transmitting rotational force of the differential case to a pair of mutually-independent output shafts. The differential case includes the input member including an input part which receives the rotational force, an end portion of the input member on at least one side in an axial direction thereof being opened, and at least one cover portion covering the opened end portion of the input member on the one side in the axial direction.

Abstract: In a differential device distributing rotational force acting on a differential case to a pair of output shafts, the differential case including an input member and a cover portion, assembling precision of the differential device is enhanced by suppressing strain due to welding and press-fitting. The input member includes: a welded portion fitting the cover portion in axial direction and joined by welding; a press-fitted portion located inward of the welded portion in radial direction and axial direction and press-fitted to the cover portion; and a connecting surface connecting the welded portion and the press-fitted portion and forming a space between the connecting surface and the cover portion; the space allowing deformation of the press-fitted portion during press-fitting. The connecting surface includes one end portion continuous to the welded portion and extending outward from the welded portion in radial direction.

Abstract: In a differential device, even in a case where tooth portions of side gears are placed farther from output shafts, or in a case of high-speed rotation of a pinion, lubricant oil can be sufficiently supplied from the output shaft sides to meshing portions of the pinion and the side gears and sliding portions of the pinion. Accordingly, seizure in the meshing portions and the sliding portions is prevented effectively. At least one of the side gears includes a lubricant oil passage in a shaft portion and a lubricant oil groove in an inner side surface facing the other side gear, the lubricant oil passage guiding the lubricant oil from an outer end portion to an inner end portion in an axial direction of the shaft portion, and the lubricant oil groove being configured to supply the lubricant oil from the lubricant oil passage to the tooth portion side.

Abstract: In a differential device, an outer tube portion is formed in one of a side gear and a sleeve, and an inner tube portion fitted to an inner periphery of the outer tube portion is formed in the other. A falling-off prevention device for preventing axial relative movement of the outer and inner tube portions is provided between the outer and inner tube portions. A seal member for shutting off communication between the falling-off prevention device and an inside of a differential case is set in a fitting portion between the outer and inner tube portions. Accordingly, lubricating oil in the differential case is prevented from leaking out of a space between the side gear and the sleeve without performing a special process such as pressure welding or adhesive bonding during assembly and which has good ease of assembly.