Abstract: An element for a metallic belt in a continuously variable transmission capable of reducing misalignment while ensuring friction force in a small diameter state is provided. An element 40 for a metallic belt in a belt-type continuously variable transmission has a structure in which a side edge of the element 40 of a metallic belt 7 that contacts a drive pulley 5 and a driven pulley 8 includes: a belt radial outer portion 46b that is located on a radial outer side of the metallic belt 7 and linearly shaped to follow a radial inner portion 11a as a constant-angle inclined generatrix portion; and a belt radial inner portion 46a that is located on a radial inner side of the metallic belt 7 and curved to taper inward in the belt radial direction to gradually increase an inclination angle.

Abstract: A metal belt for a continuously variable transmission includes a metal element wound around a drive pulley and a driven pulley and transmits a driving force between the two pulleys, in which a rocking edge is provided at the radially outer end of a front face of a body part. The rocking edge being a fulcrum for pitching of the metal element, and a recess is formed in a rear face of a neck part, and therefore, when the metal element on the rear side is displaced toward the radially outer side with respect to the metal element on the front side, the rocking edge of the metal element on the rear side enters a ring slot and the recess of the metal element on the front side, and the metal element on the rear side moves so as to be closer to the metal element on the front side.

Abstract: A control device includes: a clamping force determination unit that determines a clamping force Fs so that a transmission gear ratio R of a stepless transmission is a target transmission gear ratio; a correction unit that corrects the clamping force Fs determined by the clamping force determination unit, based on an oil temperature TO of a lubricant interposed between each of pulleys and a belt and the transmission gear ratio R; and a clamping force control unit that controls clamping of the pulleys and to be performed with the clamping force Fs corrected by the correction unit.

Abstract: A metal belt is wound around a drive pulley and a driven pulley of a continuously variable transmission. Since intervals between multiple adjuster metal element groups are set so as to avoid that the number of the adjuster metal element groups simultaneously existing on a driving-side chord portion of the metal belt between the drive pulley and the driven pulley is 2 or more, it is possible to prevent large vibration which would occur if two or more adjuster metal element groups would exist on the driving-side chord portion of the metal belt. Furthermore, since the multiple adjuster metal elements are distributionally disposed in the multiple adjuster metal element groups, it is possible to decrease imbalance among the adjuster metal element groups, compared with a case where all the adjuster metal elements are disposed in a single adjuster metal element group. Thereby, the vibration can be reduced more.

Abstract: Among V-faces (48) of a pulley (15), a portion (48a) that is radially further inside than a predetermined position P1 is susceptible to slip against a metal belt (19), but making a shape of the generatrix of the portion (48a) on the radially inner side into a straight line enables a large coefficient of friction against the metal belt (19) to be ensured, thereby reliably preventing slip from occurring. Furthermore, by making, among the V-faces (48) of the pulley (15), a shape of the generatrix of a portion (48b) that is radially further outside than the predetermined position P1 into a curved line that curves in a direction that compensates for misalignment (C) of the metal belt (19) ensures that the metal belt (19) smoothly bites into the V-faces (48), thereby enabling the durability of the metal belt (19) or the pulley (15) to be enhanced.

Abstract: An oil hole penetrating through a partition wall of a pulley cover of a continuously variable transmission is formed in a direction perpendicular to an axis of the pulley cover. The pulley cover, having first and second hydraulic oil chambers through which a movable pulley half of a pulley of the continuously variable transmission is biased toward a fixed pulley half thereof, is manufactured in the step of machining a metal sheet. The manufacturing step includes a first step of press-forming the annular partition wall of the pulley cover, a second step of opening the oil hole in the partition wall, the oil hole allowing communication between the first and second hydraulic oil chambers, and a third step of press-forming the peripheral wall of the second hydraulic oil chamber at an outer side, in a radial direction, of the partition wall.

Abstract: An element for a metallic belt in a continuously variable transmission capable of reducing misalignment while ensuring friction force in a small diameter state is provided. An element 40 for a metallic belt in a belt-type continuously variable transmission has a structure in which a side edge of the element 40 of a metallic belt 7 that contacts a drive pulley 5 and a driven pulley 8 includes: a belt radial outer portion 46b that is located on a radial outer side of the metallic belt 7 and linearly shaped to follow a radial inner portion 11a as a constant-angle inclined generatrix portion; and a belt radial inner portion 46a that is located on a radial inner side of the metallic belt 7 and curved to taper inward in the belt radial direction to gradually increase an inclination angle.

Abstract: An element 40 for a metallic belt in a belt-type continuously variable transmission has a structure in which: a belt radial outer portion 46b of a metallic belt 7 is linearly shaped to come into line contact with a pulley radial inner portion 11a which is a constant-angle inclined generatrix portion of a pulley 5 or 8; a projecting portion 48 located below a locking edge portion 44a and extending inward in the belt radial direction is provided at each of the lower ends of both side edges of the element 40; and when the element 40 and a pulley radial outer portion 11b which is a curved generatrix portion of the pulley 5 or 8 contact each other, the projecting portion 48 bends inward in the axial direction of the pulley 5 or 8.

Abstract: A continuously variable transmission metal belt includes a metal ring assembly and metal elements. The metal ring assembly includes stacked endless metal rings. Each of the stacked endless metal rings includes a flat peripheral surface and a substantially semicircular end face. The substantially semicircular end face is connected to an end of the peripheral surface in a width direction of each of the stacked endless metal rings. The metal elements are supported on the metal ring assembly. A displacement Z of the end face is smaller than or equal to 0.1R. The displacement Z is defined as Z=R?H. R is a radius of an imaginary circle that passes through a contact point between the peripheral surface and the end face and that is tangent to the end face. H is a distance from a center of the imaginary circle to the peripheral surface.

Abstract: In a hydraulic control apparatus for a continuously variable transmission that enables gear ratio variation by controlling supply of hydraulic oil to first and second hydraulic actuators, there are provided with first and second oil passages connecting the first and second actuators to a reservoir, a single electric hydraulic pump installed at a common portion thereof, first and second check valves installed in the first and second oil passages for blocking flow of hydraulic oil to the reservoir, first and second bypass passages formed in the first and second oil passages, a control valve installed therebetween, a fourth check valve installed in the first and second bypass passages for blocking flow of hydraulic oil to the hydraulic pump, and a controller for controlling these, thus readily enabling a configuration that reduces the number of electric hydraulic pumps to one and minimizes cost increase.

Abstract: Among V-faces (48) of a pulley (15), a portion (48a) that is radially further inside than a predetermined position P1 is susceptible to slip against a metal belt (19), but making a shape of the generatrix of the portion (48a) on the radially inner side into a straight line enables a large coefficient of friction against the metal belt (19) to be ensured, thereby reliably preventing slip from occurring. Furthermore, by making, among the V-faces (48) of the pulley (15), a shape of the generatrix of a portion (48b) that is radially further outside than the predetermined position P1 into a curved line that curves in a direction that compensates for misalignment (C) of the metal belt (19) ensures that the metal belt (19) smoothly bites into the V-faces (48), thereby enabling the durability of the metal belt (19) or the pulley (15) to be enhanced.

Abstract: Although a radial outside portion of a metal ring contact surface of a neck section of a metal element which is contactably opposed to a side edge of a metal ring of a metal ring assembly has high frequencies of contacting with a side edge of the metal ring, it is possible to suppress abrasion of the side edge of the metal ring and to improve durability of the metal ring by setting a surface hardness of the radial outside portion lower than a surface hardness of the metal ring. In addition, by setting a surface hardness of the metal ring contact surface at its portion of the radial outside lower than the surface hardness of the metal ring contact surface at other portions thereof where the frequencies of contacting with the side edge of the metal ring becomes low, in comparison with a case of setting the surface hardness of the whole metal ring contact surface low, it is possible to increase strength of the metal element and to improve the durability of the metal element.

Abstract: A lubrication device for a belt type continuously variable transmission is provided in which a nozzle tube (25) communicating with an oil supply source (26) is disposed between a drive pulley (5) and a driven pulley (6) of a belt type continuously variable transmission (2) along the axial direction of the drive pulley (5) and the driven pulley (6), this nozzle tube (25) being provided with first and second oil spray holes (27, 28) for spraying oil toward belt grooves (12, 21) of the two pulleys (5, 6) respectively, wherein the first oil spray hole (27) is made to be open toward a large-diameter portion of a belt contact face (21a) of a fixed pulley half body (19) of the one, of the drive pulley (5) and the driven pulley (6), that is positioned on an upstream side of the nozzle tube (25), and the second oil spray hole (28) is made to be open toward the belt groove (12) of the other of the drive pulley (5) and the driven pulley (6) at a position downstream of the nozzle tube (25) relative to the first oil spray

Abstract: In a hydraulic control apparatus for a continuously variable transmission that enables gear ratio variation by controlling supply of hydraulic oil to first and second hydraulic actuators, there are provided with first and second oil passages connecting the first and second actuators to a reservoir, a single electric hydraulic pump installed at a common portion thereof, first and second check valves installed in the first and second oil passages for blocking flow of hydraulic oil to the reservoir, first and second bypass passages formed in the first and second oil passages, a control valve installed therebetween, a fourth check valve installed in the first and second bypass passages for blocking flow of hydraulic oil to the hydraulic pump, and a controller for controlling these, thus readily enabling a configuration that reduces the number of electric hydraulic pumps to one and minimizes cost increase.

Abstract: In a hybrid drive apparatus having an engine, a motor generator, and a planetary gear mechanism in which the output shaft of the motor generator is coupled to a sun gear, the output shaft of the engine is coupled to a ring gear, and the input shaft of a continuously variable transmission mechanism is coupled to a carrier, the hybrid drive apparatus includes a first clutch that can switch engagement/disengagement between the output shaft of the engine and the ring gear, a second clutch that can switch engagement/disengagement between the carrier and the ring gear, and a third clutch that can switch engagement/disengagement on the input shaft of the transmission mechanism. Consequently, the power transmission path for the driving force from the engine can be separated from the power transmission path between the motor generator and drive wheels, and various driving modes can be set while improving power transmission efficiency.

Abstract: An oil hole penetrating through a partition wall of a pulley cover of a continuously variable transmission is formed in a direction perpendicular to an axis of the pulley cover. The pulley cover, having first and second hydraulic oil chambers through which a movable pulley half of a pulley of the continuously variable transmission is biased toward a fixed pulley half thereof, is manufactured in the step of machining a metal sheet. The manufacturing step includes a first step of press-forming the annular partition wall of the pulley cover, a second step of opening the oil hole in the partition wall, the oil hole allowing communication between the first and second hydraulic oil chambers, and a third step of press-forming the peripheral wall of the second hydraulic oil chamber at an outer side, in a radial direction, of the partition wall.

Abstract: A continuously variable transmission metal belt includes a metal ring assembly and metal elements. The metal ring assembly includes stacked endless metal rings. Each of the stacked endless metal rings includes a flat peripheral surface and a substantially semicircular end face. The substantially semicircular end face is connected to an end of the peripheral surface in a width direction of each of the stacked endless metal rings. The metal elements are supported on the metal ring assembly. A displacement Z of the end face is smaller than or equal to 0.1R. The displacement Z is defined as Z=R?H. R is a radius of an imaginary circle that passes through a contact point between the peripheral surface and the end face and that is tangent to the end face. H is a distance from a center of the imaginary circle to the peripheral surface.

Abstract: In a metal ring for a metal belt of a belt type continuously variable transmission, a relationship is established between a compressive residual stress of a metal ring of an innermost layer imparted by a nitriding treatment and a free state radius of the metal ring nondimensionalized by a minimum winding radius. In the relationship, the sum of a compressive residual stress acting on the inner peripheral face of the metal ring, a compressive stress due to flexure and a contact stress does not exceed the elastic deformation limit of the metal ring. The maximum compressive stress of the metal ring does not become excessive, and an abrasion resistance of the surfaces of the metal ring is guaranteed.

Abstract: A lubrication device for a belt type continuously variable transmission is provided in which a nozzle tube (25) communicating with an oil supply source (26) is disposed between a drive pulley (5) and a driven pulley (6) of a belt type continuously variable transmission (2) along the axial direction of the drive pulley (5) and the driven pulley (6), this nozzle tube (25) being provided with first and second oil spray holes (27, 28) for spraying oil toward belt grooves (12, 21) of the two pulleys (5, 6) respectively, wherein the first oil spray hole (27) is made to be open toward a large-diameter portion of a belt contact face (21a) of a fixed pulley half body (19) of the one, of the drive pulley (5) and the driven pulley (6), that is positioned on an upstream side of the nozzle tube (25), and the second oil spray hole (28) is made to be open toward the belt groove (12) of the other of the drive pulley (5) and the driven pulley (6) at a position downstream of the nozzle tube (25) relative to the first oil spray

Abstract: A belt type non-stage transmission is constituted so that a V belt obtained by connecting a plurality of elements using a belt is wound around a pair of pulleys which have a groove with V-shaped cross section and which groove width can be changed. A diffusion layer where at least one of Zn and Sn diffuses on a surface layer of a metallic material of the pulleys and the elements is provided to at least one of contacting surfaces between the pulleys and the elements. The diffusion layer contains S and P. As a result, high frictional coefficient and wear resistance can be maintained for a long time, so that the device can cope with heightening of output.