Abstract: A piston for an automatic transmission includes: (a) a cylindrical wall portion provided by a first piston member; (b) a bottom wall portion provided by a second piston member; and (c) an engaging portion at which the first and second piston members are engaged with each other such that the first piston member is movable relative to the second piston member in an axial direction of the piston by a small distance. The piston is characterized by further including (d) an elastic structure which is provided at the engaging portion, and which biases the first piston member in the axial direction, so as to restrain movement of the first piston member relative to the second piston member in the axial direction.

Abstract: A clutch device for an automatic transmission, including a clutch drum supporting frictional coupling elements, a clutch piston disposed radially outwardly of the clutch drum, and a rotary speed sensor disposed radially outwardly of the clutch piston to detect a rotating speed of the clutch piston. The clutch piston has an inner spline for engagement with an outer spline of the clutch drum to prevent relative rotation between the clutch piston and the clutch drum, and further has a plurality of recesses formed in an outer circumferential surface thereof and corresponding to respective teeth of the inner spline, and a plurality of oil holes formed therethrough at an axial position of the clutch device at which the rotary speed sensor is located. The recesses and the oil holes are equally spaced apart from each other in a circumferential direction of the clutch piston, and cooperate to provide a sensed portion to be sensed by the rotary speed sensor.

Abstract: A vehicular automatic transmission including a first planetary gear device and a first set of frictional coupling elements, which can be supported by a pump housing via first and second retainer rings, at predetermined axial positions within the pump housing, during assembling of the automatic transmission. The first retainer ring is fixed to a radially inner spline-fitting part of a cylindrical extending portion of the pump housing, while the second retainer ring is fitted in a first circumferential groove formed in a ring gear of the first planetary gear device and a second circumferential groove formed in the inner circumferential surface of a splined cylindrical portion of a first hub splined to the outer circumferential surface of the ring gear and the radially inner portions of the first set of frictional coupling elements. The automatic transmission is manufactured by assembling a subassembly with respect to a stationary cylindrical housing to which the pump housing is fixed.

Abstract: A piston for an automatic transmission, including a first piston member forming a cylindrical portion and a second piston member forming a bottom portion, wherein the first piston member has a plurality of engaging grooves formed in one of opposite axial end portions thereof, each of the engaging grooves having a radial surface extending in a radial direction of the first piston member, and the second piston member has a plurality of elongate claws (70) extending in a circumferential direction thereof and respectively corresponding to the engaging grooves, each elongate claw having a free end portion and a fixed end portion, and being bent in an axial direction of the second piston member such that the free end portion is spaced from the fixed end portion in the axial direction toward an open end of the piston, each elongate claw having a first engaging lug which is formed at the free end portion and which is held in engagement with the corresponding engaging groove and in pressing contact with the radial end

Abstract: A drive unit qualified as an automatic transmission- includes a rotational shaft transmitting power, a planetary gear mechanism linked to the rotational shaft, and a friction engagement device provided at the outer circumferential side of the planetary gear mechanism. The planetary gear mechanism includes a pinion gear, and a pinion shaft supporting the pinion gear in a rotatable manner. The pinion shaft includes an oil inlet through which oil flows in, an oil outlet provided so as to supply oil flowing in from the oil inlet to the friction engagement device, and an oil channel communicating the oil inlet with the oil outlet.

Abstract: Here is disclosed a method and apparatus for folding a continuously fed in two. The web is folded along guide means defining a folding guide line with a fold angle gradually reduced. In the course of gradually reducing the fold angle, a plurality of guide rolls through are pressed against transversely opposite side edge portions of the web. Immediately before the stage on which the web is completely folded in two, there are provided detector means adapted to detect actual positions of the respective side edge portions and swing rolls located upstream of these detector means adapted to change a crossing angle of the web with respect to a machine direction. Actuators interposed between the detector means and the swing guide rolls cause the swing guide rolls to swing and thereby to move the side edge portions toward predetermined positions.

Abstract: An automatic transmission includes a parallel-axis gear pair including a first gear having a shaft portion and a gear portion, and a second gear which meshes with the first gear; a case that has a supporting wall which is adjacent to the gear portion of the first gear and rotatably supports the shaft portion of the first gear; and a frictional engagement apparatus that includes friction members, a piston that presses on, so as to apply, the friction members, and a hydraulic chamber that holds hydraulic fluid which moves the piston in the direction of the friction members. As a result, both the shaft to shaft dimension as well as the axial dimension of the automatic transmission can be reduced.

Abstract: A piston for an automatic transmission, wherein a first piston member forming a cylindrical portion of the piston has a plurality of axial cutouts and a circumferential groove formed in one axial end portion thereof, and a second piston member forming a bottom portion of the piston has a plurality of radially extending engaging jaws fitted in the plurality of axial cutouts, while a retainer ring is fitted in the circumferential groove and held in abutting contact with the engaging jaws fitted in the axial cutouts, whereby the first and second piston members are fixed to each other. At least one of the engaging jaws of the second piston member cooperates with the retainer ring to form a gap therebetween, which prevents a stress concentration on portions of the circumferential groove adjacent to the axial cutouts, upon an axial movement of the piston, so that the required thickness of the retainer ring can be reduced, leading to size reduction of the piston.

Abstract: A cylinder tube of a second hydraulic cylinder is provided separate from a first piston of a first hydraulic cylinder and integrally fixed to an input shaft. Friction members of a first clutch and friction members of a second clutch are prevented from moving in a first direction by a snap ring attached to a connecting drum. The friction members of the first clutch are friction engaged by the first piston and the friction members of the second clutch are friction engaged by a second piston.

Abstract: A piston for an automatic transmission, including a first piston member forming a cylindrical portion and a second piston member forming a bottom portion, wherein the first piston member has a plurality of engaging grooves formed in one of opposite axial end portions thereof, each of the engaging grooves having a radial surface extending in a radial direction of the first piston member, and the second piston member has a plurality of elongate claws (70) extending in a circumferential direction thereof and respectively corresponding to the engaging grooves, each elongate claw having a free end portion and a fixed end portion, and being bent in an axial direction of the second piston member such that the free end portion is spaced from the fixed end portion in the axial direction toward an open end of the piston, each elongate claw having a first engaging lug which is formed at the free end portion and which is held in engagement with the corresponding engaging groove and in pressing contact with the radial end

Abstract: A piston for an automatic transmission including a pair of mutually meshing gears such as counter drive and driven gears mounted on respective two parallel shafts, the piston including a bottom portion, and a cylindrical portion to be disposed radially outwardly of one of the mutually meshing gears, wherein the cylindrical portion has not only a cutout formed in a first circumferential part thereof for permitting mutual meshing engagement of the mutually meshing gears such that a point of the mutual meshing engagement is located within a circumference of the cylindrical portion, but also a through-hole formed in a second circumferential part thereof so that a speed sensor extends through the through-hole, for detecting the rotating speed of the above-indicated one gear disposed radially inwardly of the cylindrical portion. This arrangement of the cylindrical portion permits size reduction of the cutout, and assures sufficiently high degrees of strength and rigidity of the piston.

Abstract: A piston for an automatic transmission includes: (a) a cylindrical wall portion provided by a first piston member; (b) a bottom wall portion provided by a second piston member; and (c) an engaging portion at which the first and second piston members are engaged with each other such that the first piston member is movable relative to the second piston member in an axial direction of the piston by a small distance. The piston is characterized by further including (d) an elastic structure which is provided at the engaging portion, and which biases the first piston member in the axial direction, so as to restrain movement of the first piston member relative to the second piston member in the axial direction.

Abstract: A friction disc in a tandem frictional engagement device, that is spline-fitted to a first coupling members is pressed by a first piston in a first direction, wherein the friction disc and another friction disc on the side of a first coupled member are clamped between the first piston and a first stopper member. A friction disc that is spline-fitted to a second coupling member is pressed by a second piston in an opposite direction, wherein the friction disc and another friction disc on the side of a second coupled member are clamped between the second piston and a second stopper member. A leading end of a first fitting portion of the first coupling member to which the friction disc is spline-fitted is the second stopper member and substantially abuts a second fitting portion of the second coupling member to which the friction disc is spline-fitted.

Abstract: A clutch device for an automatic transmission, wherein a piston is disposed radially outwardly of a drum supporting frictional coupling elements, and cooperates with the drum to define a hydraulic pressure chamber, and a balancer is disposed on one side of the piston which is remote from the hydraulic pressure chamber, the balancer cooperating with the piston to define a canceling chamber. The clutch device is characterized in that: the drum has a stepped portion, and a shaft to which the drum is fixed has a flange portion; and the drum is fixed to the shaft such that the stepped portion of the drum and the flange portion of the shaft cooperate to define therebetween an oil sump, and the drum has an oil hole for communication between the oil sump and the canceling chamber.

Abstract: A lubricating structure of a friction engaging device including a rotating drum which is a cylindrical rotating body, around a perimeter of which there is provided a friction member, and which is engaged with/disengaged from a predetermined coupling member via the friction member; and a ring gear which is spline-coupled to an inner surface of the rotating drum and which is positioned while contacting an inward flange that is integrally provided with the rotating drum. In the lubricating structure, a centrifugal oil passage which is formed between the ring gear and the inward flange, and which introduces lubricating oil inside the rotating drum to a spline-coupled portion of the ring gear and the rotating drum by centrifugal force, and a plurality of through holes which are formed in the rotating drum and through which the lubricating oil, that has flowed into the spline-coupled portion, flows to an outside of the rotating drum where the friction member is provided are formed.

Abstract: A cylinder tube of a second hydraulic cylinder is provided separate from a first piston of a first hydraulic cylinder and integrally fixed to an input shaft. Friction members of a first clutch and friction members of a second clutch are prevented from moving in a first direction by a snap ring attached to a connecting drum. The friction members of the first clutch are friction engaged by the first piston and the friction members of the second clutch are friction engaged by a second piston.

Abstract: Here is disclosed a method and apparatus for folding a continuously fed in two. The web is folded along guide means defining a folding guide line with a fold angle gradually reduced. In the course of gradually reducing the fold angle, a plurality of guide rolls through are pressed against transversely opposite side edge portions of the web. Immediately before the stage on which the web is completely folded in two, there are provided detector means adapted to detect actual positions of the respective side edge portions and swing rolls located upstream of these detector means adapted to change a crossing angle of the web with respect to a machine direction. Actuators interposed between the detector means and the swing guide rolls cause the swing guide rolls to swing and thereby to move the side edge portions toward predetermined positions.

Abstract: Here is disclosed a method and apparatus for folding a continuously fed in two. The web is folded along guide means defining a folding guide line with a fold angle gradually reduced. In the course of gradually reducing the fold angle, a plurality of guide rolls through are pressed against transversely opposite side edge portions of the web. Immediately before the stage on which the web is completely folded in two, there are provided detector means adapted to detect actual positions of the respective side edge portions and swing rolls located upstream of these detector means adapted to change a crossing angle of the web with respect to a machine direction. Actuators interposed between the detector means and the swing guide rolls cause the swing guide rolls to swing and thereby to move the side edge portions toward predetermined positions.

Abstract: A display method and apparatus for a navigation system which is capable of easily and quickly showing the existence of a large structure within which a specific point of interest (“POI”) is located. The navigation system searches a desired point of interest as specified by a user, examines whether the point of interest is located within a large structure, searches an icon representing a type of the large compound in which the point of interest is located, and displays the icon of the large structure and the POI name on a monitor of the navigation system. Upon selection of the icon by the user, the navigation system displays detailed information on the large structure.

Abstract: An automatic transmission having seven gear speeds for forward driving is provided, in which a planetary gear P1 of a first planetary gear set 12 and an outer planetary gear P2out of a second planetary gear set 14 are integrally coupled, a first rotational element M1 is formed by a sun gear S1, a second rotational element M2 is formed by carriers CA1, CA2 coupled with each other, a third rotational element M3 is formed by a ring gear R2, a fourth rotational element is formed by a ring gear R1, and a fifth rotational element M5 is formed by a sun gear S2. The rotational elements M5, M3, M2 are connectable to an input shaft 16 via clutches C1, C2, C3, respectively, and the rotational elements M3, M2, M1 are connectable to a case 20 via brakes B1, B2, B3, respectively. The rotational element M4 is integrally coupled with an output gear 18.