Abstract: A friction plate for a wet-type multiplate clutch provided with a core plate and friction linings fixed on opposite sides of the core plate, respectively. Each of the friction linings is formed such that at a section thereof located on a side radially inner than a radial center line thereof, the friction lining has a thickness that gradually increases from an inner circumferential portion of the section toward an outer circumferential portion of the section.

Abstract: In a lockup clutch assembly for use in a torque converter, a friction lining attached to one of a clutch piston and a front cover of the torque converter is divided into an outer-circumference-side friction lining and an inner-circumference-side friction lining. The outer-circumference-side friction lining contains as a filler diatomaceous earth in a higher proportion than the inner-circumference-side friction lining.

Abstract: In a torque converter equipped with a lock-up clutch device, a friction member is put on either one of a front cover and a lock-up piston which are to be brought into contact. On the front cover, coupling members are welded for coupling with an engine. Owing to welding distortion, convex portions are generated on a friction face. Thus, when the friction member is put on either side of the front cover and clutch piston, if relative rotation slippage occurs therebetween, a positive pressure and a negative pressure are produced in front of and behind each convex portion, which leads to the stick/slip. This invention gives grooves 71 each exceeding the range of a welding portion 61 of the coupling member 6 which are formed on the friction face of the friction member 7, which realizes balancing in a change in pressure.

Abstract: In a wet type friction plate having a groove through which lubricating oil passes, the groove is subjected to oil repelling treatment.

Abstract: In a lockup clutch assembly for use in a torque converter, a friction lining attached to one of a clutch piston and a front cover of the torque converter is divided into an outer-circumference-side friction lining and an inner-circumference-side friction lining. The outer-circumference-side friction lining contains as a filler diatomaceous earth in a higher proportion than the inner-circumference-side friction lining.

Abstract: A friction plate for a wet-type multiplate clutch provided with a core plate and friction linings fixed on opposite sides of the core plate, respectively. Each of the friction linings is formed such that at a section thereof located on a side radially inner than a radial center line thereof, the friction lining has a thickness that gradually increases from an inner circumferential portion of the section toward an outer circumferential portion of the section.

Abstract: A wet type friction plate comprises symmetrical segments cut out of a frictional member, and pasted on the metallic core plate so as to form a groove which is gradually narrower from the inner diameter side to the outer diameter side. A method of producing the wet type friction plate, comprising the steps of cutting symmetrical segments out of a frictional member, and pasting the cut-out symmetrical segments on a metallic core plate so as to form a groove which is gradually narrower from the inner diameter side to the outer diameter side.

Abstract: In a wet friction material and a method therefor of the present invention, an excessive binder coating on the outermost surface layer of the friction material is removed or prevented while at least one of impregnation, drying and setting of a binder, and further the surface of the friction material is smoothed by means of heating, pressurizing and molding.

Abstract: A band braking device has an annular brake band having a frictional surface formed on the inner peripheral side thereof and a bracket fixed to an end portion thereof. Concave portions are formed on one of the bracket and the brake band, and convex portions are formed on the other to be engaged with the concave portions.

Abstract: A band braking device has an annular brake band having a frictional surface formed on the inner peripheral side thereof and a bracket fixed to an end portion thereof. Concave portions are formed on one of the bracket and the brake band, and convex portions are formed on the other to be engaged with the concave portions.

Abstract: In a wet friction material and a method therefor of the present invention, an excessive binder coating on the outermost surface layer of the friction material is removed or prevented while at least one of impregnation, drying and setting of a binder, and further the surface of the friction material is smoothed by means of heating, pressurizing and molding.

Abstract: In a wet friction material and a method therefor of the present invention, an excessive binder coating on the outermost surface layer of the friction material is removed or prevented while at least one of impregnation, drying and setting of a binder, and further the surface of the friction material is smoothed by means of heating, pressurizing and molding.

Abstract: In a wet friction material and a method therefor of the present invention, an excessive binder coating on the outermost surface layer of the friction material is removed or prevented while at least one of impregnation, drying and setting of a binder, and further the surface of the friction material is smoothed by means of heating, pressurizing and molding.

Abstract: A wet friction material is mainly composed of a fiber base material, a filler, an friction adjusting agent and a thermosetting resin. The wet frictional material is prepared by impregnating with a liquid thermosetting resin a paper formed by mixing a paper-forming solid thermosetting resin with a fiber base material as at least a part of filler, and then applying heat to the paper so that it is hardened. The solid thermosetting resin is preferably a phenol resin. The liquid thermosetting resin is preferably made of a silicone resin represented by the following average composition formula and the amount of trifunctional unit monomers (RSiO3/2 in which R represents a substituted or unsubstituted monovalent hydrocarbon group) in monomers constituting said silicone resin is from 40 to 100 mol-%: (R1)a(OR2)bSiO(4−a−b)/2.

Abstract: In a wet type multiplate clutch wherein outer tooth plates and inner tooth plates rotatable relative to each other are coaxially alternately disposed and are frictionally engaged with each other, of a plurality of oil grooves having opening portions opening to the inner peripheral edges of frictional materials secured to the inner tooth plates, at least 50 percent of the opening portions are opposed to a lubricant supply hole formed in a hub.

Abstract: A band braking device has an annular brake band having a frictional surface formed on the inner peripheral side thereof and a bracket fixed to an end portion thereof. Concave portions are formed on one of the bracket and the brake band, and convex portions are formed on the other to be engaged with the concave portions.

Abstract: In a wet friction material formed from carbon fibers as a main ingredient and synthetic organic highly-fine fibers as reinforcing material, the carbon fibers as a main ingredient are formed into a shape. Further, the compounding ratio of each of the carbon fibers and the reinforcing material is made to be within a range from 10 to 50% with respect to paper ingredients.

Abstract: A friction plate is constituted by a core plate, and friction members fixed respectively to opposite surfaces of the core plate. The friction member has oil passages, extending therethrough from its inner peripheral surface to its outer peripheral surface, and oil grooves which are open to the inner peripheral surface, but do not extend through the friction member. The area ratio of the oil grooves to the oil passages is 25% to 100%; and the width of the oil groove is not larger than the width of the oil passage. The length of the oil groove is not less than 1/4 of the length of the oil passage. It is not necessary that all of the oil grooves have the same length. Preferably, the width of the oil passage, as well as the width of the oil groove, is not more than 3 mm. The oil passages and the oil grooves may be inclined relative to the radial direction.

Abstract: In a method of producing a wet friction material according to the present invention, a water soluble material is dispersed into a raw paper including a fibrous base material, a filler, and a friction adjusting agent. Then, the raw paper is passed through water to dissolve the water soluble material to provide porosity. Thereafter, the raw paper is immersed with thermosetting resin, and heated and hardened to thereby produce a wet friction material.

Abstract: A lining for a brake band wherein brackets of the same shape or different shapes are connected respectively to opposite ends of a curved thin strap having an adhesive thereon, and a thin wet lining is bonded to an inner side of the curved strap, characterized in that cavities containing lubricating oil are formed in the lining.