Abstract: A friction plate for a wet-type multiplate clutch is provided with a core plate and friction linings bonded on opposite sides of the core plate, respectively. Each of the friction linings is composed of plural segment pieces each have at least one first oil groove and at least one second oil groove. The first oil groove opens to a radially-inner side of its corresponding segment piece and has a closed end portion located in a radially-intermediate part of the corresponding segment piece. The second oil groove opens to a radially-outer side of the corresponding segment piece and has a closed end portion located in another radially-intermediate part of the corresponding segment piece. Each segment piece is provided with at least one press-formed oil groove as one of the first and second oil grooves and at least one punched-out oil groove as the other one of the first and second oil grooves.

Abstract: In a friction plate 40, segment pieces 42 of a friction material are bonded onto a core plate 40 at intervals in a circumferential direction. 43 denotes a spline tooth. On each segment piece, there are formed a first oil groove which is made to open to an inside-diameter side of the segment piece and has its end portion part-way along the segment piece (hereinafter, referred to as a first oil groove) and a second oil groove which is made to open to an outside-diameter side of the segment piece and has its end portion part-way along the segment piece (hereinafter, referred to as a second oil groove). Segment pieces in which a first oil groove 51 and second oil grooves 61 are pressure molded and segment pieces in which a first oil grooves 52 and second oil grooves 62 are stamped are arranged alternately.

Abstract: A friction plate for a wet-type multiplate clutch is provided with a core plate and friction linings bonded on opposite sides of the core plate, respectively. Each of the friction linings is composed of plural segment pieces each having at least one first oil groove and at least one second oil groove. The first oil groove opens to a radially-inner side of the friction plate and has a closed end portion located in a radially-intermediate part of the friction lining, and the second oil groove opens to a radially-outer side of the friction plate and has a closed end portion located in another radially-intermediate part of the friction lining. The second oil groove has an opening flared outwardly in a radial direction.

Abstract: The present invention provides a friction plate having a friction surface formed by adhering a friction material to a substantially annular core plate and wherein the friction surface is provided with an oil passage communicated with inner and outer peripheral edges of the friction plate, a first oil groove having an opening portion opened to the inner peripheral edge of the friction plate and an end portion terminating at a position between the inner and outer peripheral edges, and a second first oil groove having an opening portion opened to the outer peripheral edge of the friction plate and an end portion terminating at a position between the inner and outer peripheral edges.

Abstract: A friction plate for a wet-type multiplate clutch is provided with a core plate and friction linings bonded on opposite sides of the core plate, respectively. Each of the friction linings is composed of plural segment pieces bonded at angular intervals on the corresponding one of said opposite sides. The segment pieces each have at least one first oil groove and at least one second oil groove. The first oil groove opens to a radially-inner side of its corresponding segment piece and has a closed end portion located in a radially-intermediate part of the corresponding segment piece, and the second oil groove opens to a radially-outer side of the corresponding segment piece and has a closed end portion located in another radially-intermediate part of the corresponding segment piece. The segment pieces are each provided in a friction surface thereof with at least one oil pocket closed at a circumference thereof.

Abstract: A wet-type multiplate clutch has an outer circumferential drum section, an inner circumferential hub, a pressing member, and a clutch engagement unit composed of plural friction plates and separator plates alternately arranged between the drum section and the hub.

Abstract: A friction plate for a wet-type multiplate clutch is provided with a core plate and friction linings bonded on opposite sides of the core plate, respectively. Each of the friction linings is composed of plural segment pieces bonded at angular intervals on the corresponding one of said opposite sides. The segment pieces each have at least one first oil groove and at least one second oil groove. The first oil groove opens to a radially-inner side of its corresponding segment piece and has a closed end portion located in a radially-intermediate part of the corresponding segment piece, and the second oil groove opens to a radially-outer side of the corresponding segment piece and has a closed end portion located in another radially-intermediate part of the corresponding segment piece. The segment pieces are each provided in a friction surface thereof with at least one oil pocket closed at a circumference thereof.

Abstract: A friction plate for a wet-type multiplate clutch is provided with plural segment pieces of a friction lining, which are bonded at angular intervals on the friction plate. Each of the segment pieces has at least one first oil groove and at least one second oil groove. The first oil groove opens to a radially-inner side of its corresponding segment piece and has a closed end portion located in a radially-intermediate part of the corresponding segment piece. The second oil groove opens to a radially-outer side of the corresponding segment piece and has a closed end portion located in another radially-intermediate part of the corresponding segment piece. The first oil groove is provided with an oil pocket at its closed end portion.

Abstract: Segment pieces 42 of a friction material are bonded onto a core plate 41 of a friction plate 40 for a wet multi-plate clutch at intervals. A porosity of a perimetric portion 43 of the segment piece 42 which is shaded with oblique lines is made smaller by pressing or increasing a resin content of the perimetric portion 43. In addition, a perimetric portion which corresponds to the portion 43 may be made up of a separate member of a different material having a small porosity.

Abstract: In a friction plate 40, segment pieces 42 of a friction material are bonded onto a core plate 40 at intervals in a circumferential direction. 43 denotes a spline tooth. On each segment piece, there are formed a first oil groove which is made to open to an inside-diameter side of the segment piece and has its end portion part-way along the segment piece (hereinafter, referred to as a first oil groove) and a second oil groove which is made to open to an outside-diameter side of the segment piece and has its end portion part-way along the segment piece (hereinafter, referred to as a second oil groove). Segment pieces in which a first oil groove 51 and second oil grooves 61 are pressure molded and segment pieces in which a first oil grooves 52 and second oil grooves 62 are stamped are arranged alternately.

Abstract: A friction plate for a wet-type multiplate clutch is provided with a core plate and friction linings bonded on opposite sides of the core plate, respectively. Each of the friction linings is composed of plural segment pieces each have at least one first oil groove and at least one second oil groove. The first oil groove opens to a radially-inner side of its corresponding segment piece and has a closed end portion located in a radially-intermediate part of the corresponding segment piece. The second oil groove opens to a radially-outer side of the corresponding segment piece and has a closed end portion located in another radially-intermediate part of the corresponding segment piece. Each segment piece is provided with at least one press-formed oil groove as one of the first and second oil grooves and at least one punched-out oil groove as the other one of the first and second oil grooves.

Abstract: Friction materials 21 and 22 of different types which differ from each other in terms of a material and a thickness are affixed to respective surfaces of the friction plate 20 and engage with surfaces 31 and 32 of respective separators 30. In the case where the friction materials 21 and 22 are affixed to respective surfaces of the core plate 23 of the fiction plate 20, when the friction materials 21 and 22 are aligned in this sequence along a horizontal direction in a drawing, the surface 31 of the separator plate 30 engages with either of the friction materials 21 and 22, and the surface 32 of the same engages with a remaining friction material. However, when the friction materials 21 and 22 are affixed alternately in different sequence, either of the friction materials 21 and 22 engages with both sides of one separator plate 30.

Abstract: The present invention provides a friction plate having a friction surface formed by adhering a friction material to a substantially annular core plate and wherein the friction surface is provided with an oil passage communicated with inner and outer peripheral edges of the friction plate, a first oil groove having an opening portion opened to the inner peripheral edge of the friction plate and an end portion terminating at a position between the inner and outer peripheral edges, and a second first oil groove having an opening portion opened to the outer peripheral edge of the friction plate and an end portion terminating at a position between the inner and outer peripheral edges.

Abstract: A wet-type multiplate clutch has an outer circumferential drum section, an inner circumferential hub, a pressing member, and a clutch engagement unit composed of plural friction plates and separator plates alternately arranged between the drum section and the hub.

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 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: The invention includes a decompression board 35 bonded on a piston 1, and bonds a friction member 40 on a surface of the decompression board, wherein an oil groove is formed on the decompression board.

Abstract: In a torque converter with a lock-up mechanism which can decrease a distribution of hydraulic pressure in the radial and circumferential directions of a frictional material, which can prevent the creation of any excess reaction by the distribution of hydraulic pressure, and which can efficiently give a fastening force to the frictional material to thereby improve transmission torque capacity, an oil groove for reducing the distribution of hydraulic pressure is provided on the frictional material or a piston. This oil groove is provided for depressurization at a location which does not hinder the fastening function.