Abstract: A partition plate (cast-in object plate member) is preliminarily set in an intake-port forming sand core, by which an intake port of a cylinder head is molded, and cast in during cast molding of the cylinder head for partitioning the intake port. The partition plate has both distal ends, spaced apart in a longitudinal direction, one of which corresponds to an intake-side distal end at which an acute-angled end face is formed to induce core breaking in a port core at an area closer to the intake-side distal end.

Abstract: A transmission, having a first input shaft X1, a second input shaft X2, an output shaft Xs and an idle shaft XR, wherein two gears G1, G2 are carried on a sleeve SG fitted rotatably on said first input shaft X1, and one (G1) of said gears of said sleeve SG engages with a gear G16 being fixedly carried on said counter shaft Xs, while the other gear G2 engages with a gear G7 being fixedly carried on said output shaft Xo, and further, a coupling C1 is attached between said one (G1) of said gears and the other gear G2, to fix selectively said gear G1 or G2 to said input shaft X1, is provided in the present invention.

Abstract: The object of the present invention is to provide a synchro-spring to be used in a synchronizing mechanism having insert-shifting keys. Said synchro-spring is characterized by shaping convex forms in the portions which come into contact with said insert-shifting keys, and when this synchronizing mechanism is used for an automobile transmission, an enough capacity of the synchronizer ring can be ensured without increasing the size of the synchronizing mechanism, and smooth gear shifting is attained, and then excellent operability can be acquired.

Abstract: An upper oil pan of an engine includes a flange with an oil pan abutment surface that is fixedly coupled to a flange formed on a cylinder block. The oil pan abutment surface comprises a flat portion that is substantially parallel to a cylinder block abutment surface of the cylinder block, a slanted portion that is slanted with respect to the flat portion, and a vertical wall portion connecting the flat portion and the slanted portion. The vertical wall portion is formed substantially perpendicular to the flat portion. The cylinder block and the upper oil pan are fixedly coupled together via an interposed liquid gasket. Thus, the seal structure in which the liquid gasket is adequately cured is provided, and sufficient sealing properties can be obtained with a small amount of material used.

Abstract: A transmission having a first input shaft X1 connecting a first clutch D1, a second input shaft X2, inserted in the first input shaft X1, and connecting to a second clutch D2, an output shaft Xo, a counter shaft Xs, and an idle shaft XR, is provided in the present invention. In the transmission, a gear G17 of the counter shaft Xs engaging with a gear G3 fixedly carried on the first input shaft X1 and a coupling C4 attached to the gear G17, are arrayed in the side space SP of an outer gear G12 of the output shaft Xo.

Abstract: A cylinder block for an internal combustion engine has a water jacket formed between cylindrically configured cylinder walls and a jacket sidewall. The cylinder walls is arranged to slideably retain pistons therein. The jacket sidewall is disposed around an external periphery of the cylinder walls. A pair of external block walls is provided on transverse sides of the cylinder block to extend almost an entire longitudinal length of the cylinder block. The external block walls are spaced apart from the jacket sidewall in a transverse direction to form gaps therebetween. The top end portions of the external block walls constitute an external flange portion of a top deck of the cylinder block. Thus, the rigidity of the top deck of the cylinder block is improved, and the sealing between the cylinder block and a cylinder head via a head gasket is improved.

Abstract: An apparatus for circulating a blowby gas to engine cylinders in an internal combustion engine, including a cylinder head cover including a first wall defining a first passage, and a first flange outwardly extending from the first wall, and a cylinder head including a second wall and a second flange cooperating with the first flange to form an abutting surface therebetween on which a second passage is arranged. The second passage is connected with the first passage and extending in a direction of a row of the engine cylinders. The second wall defines a plurality of third passages each having one end that is open to the second flange and communicated with the second passage and an opposite end open to an intake port of each of the engine cylinders.

Abstract: A constitution of protecting a fuel delivery tube of an engine, includes: 1) an engine body including: a) a cylinder head, and b) a ladder cam bracket defining an outer wall on a side section thereof, including: i) an outer frame, ii) an intake cam bracket, and iii) an exhaust cam bracket integrated with the outer frame and holding an exhaust cam shaft; 2) the fuel delivery tube disposed beside the engine body and extending in a direction substantially along a row of a cylinder; and 3) an intake manifold made of a material free from a metal. The outer wall of the ladder cam bracket is formed with a protrusion which protrudes toward a branch section of the intake manifold in such a manner as to prevent the branch section of the intake manifold from causing an interference with the fuel delivery tube.

Abstract: A crankcase emission control device of an internal combustion engine comprises a gas/liquid separator that separates an oil mist from blow-by gases flowing therethrough. A first passage is defined in both a crankcase and a cylinder head to connect an interior of the crankcase to a valve rocker cover chamber defined by the cylinder head. A second passage extends from the valve rocker cover chamber to the gas/liquid separator. A third passage extends from the gas/liquid separator to an intake system of the engine. For reducing the height of the entire construction of the engine, the gas/liquid separator is integrally formed by the cylinder head at a position below intake ports of the cylinder head.

Abstract: An apparatus for circulating a blowby gas to engine cylinders in an internal combustion engine, including a cylinder head cover including a first wall defining a first passage, and a first flange outwardly extending from the first wall, and a cylinder head including a second wall and a second flange cooperating with the first flange to form an abutting surface therebetween on which a second passage is arranged. The second passage is connected with the first passage and extending in a direction of a row of the engine cylinders. The second wall defines a plurality of third passages each having one end that is open to the second flange and communicated with the second passage and an opposite end open to an intake port of each of the engine cylinders.

Abstract: An apparatus for protecting a fuel system component disposed on an engine body in a vehicle, the apparatus including a protector including a first wall and a second wall connected with the first wall. The first and second walls extend toward the engine body and cooperate with each other to surround the fuel system component. The second wall has one end opposed to the engine body with a clearance. A first fastening member fixes the first wall to the engine body.

Abstract: A constitution of protecting a fuel delivery tube of an engine, includes: 1) an engine body including: a) a cylinder head, and b) a ladder cam bracket defining an outer wall on a side section thereof, including: i) an outer frame, ii) an intake cam bracket, and iii) an exhaust cam bracket integrated with the outer frame and holding an exhaust cam shaft; 2) the fuel delivery tube disposed beside the engine body and extending in a direction substantially along a row of a cylinder; and 3) an intake manifold made of a material free from a metal. The outer wall of the ladder cam bracket is formed with a protrusion which protrudes toward a branch section of the intake manifold in such a manner as to prevent the branch section of the intake manifold from causing an interference with the fuel delivery tube.

Abstract: A heavy-duty power transmission V-belt includes right and left tension members having concave parts on upper and lower faces thereof, and a large number of blocks having fitting parts for compressedly fitting the tension members therein on right and left side faces of the blocks. By compressedly fitting the tension members in the fitting parts of the blocks, the respective blocks are fixedly engaged with the tension members so as to allow the side faces thereof to be brought into contact with a groove face of the pulley. An innermost lower face is formed in an innermost portion of the fitting part of each block, and an innermost lower face angle &agr; between the innermost lower face and a vertical plane is determined so as to have a relationship of &bgr;−3<&agr;<&bgr;+3 with a belt side face angle &bgr;.

Abstract: In a pulley arrangement of a belt-type continuously variable transmission, a ring member (6) integrated with a first cylinder member (3) is coupled to a second cylinder member (5) using splines (6d and 5c) to limit mutual movements of the first and second cylinder members and using snap ring (7) to limit the axial displacement therebetween in peripheral directions of the respective first and second cylinder members. The first cylinder member is slidably contacted on an outer peripheral surface of a hollow cylindrical portion of a second conical pulley component. The second cylinder member is fixed onto an outer peripheral surface of a shaft portion of a first conical pulley component.

Abstract: A reverse idler gear mounting structure is easily and reliably assembled in a manual transmission. The transmission has a transmission case with an end wall and a side wall, input and main shafts extending in parallel in the transmission case and having rear ends directed toward the end wall, mutually engaged input and main gears operatively mounted on the input and main shafts respectively, synchronizing mechanisms operatively incorporated with the input and main gears to provide the transmission with a selected gear ratio, reverse input and main gears operatively disposed on the input and main shafts respectively, an idler shaft fixed to the rear wall and a reverse idler gear rotatably disposed on the idler shaft while meshing with both the reverse input and main gears.

Abstract: Hydraulic passages for an oil pump for a speed reducer used in electric vehicle include a first passage for connecting an inlet port of an oil pump to an oil reservoir through a first check valve, a second passage for connecting an outlet port of the oil pump to a discharged-oil demand part through a second check valve, a third passage for connecting the outlet port to the oil reservoir through a third check valve, and a fourth passage for connecting the inlet port to the discharged-oil demand part through a fourth check valve. The check valves are disposed such that, upon normal rotation of the oil pump, the first and second check valves are opened, and upon reverse rotation thereof, the third and fourth check valves are opened.

Abstract: A continuously variable transmission includes a main shaft having a stepped portion in the vicinity of an end thereof, stationary and movable flanges, and a stopper for preventing a movement of the movable flange. The stepped portion of the main shaft, an end of the movable flange, and the stopper cooperate to define a space around the main shaft.

Abstract: A park lock arrangement for use in a continuously variable transmission including a housing, an end cover and a casing having one end portion coupled with the housing and the opposite end portion coupled with the end cover. The casing has an inwardly recessed portion to define a reduced container space. A follower shaft supporting a follower pulley has one end portion rotatably supported on the end cover and the opposite end portion extending into the housing. A driver gear is mounted on the opposite end portion of the follower shaft. A parking gear is disposed on the follower shaft between the follower pulley and the driver gear. A control shaft extends through the reduced container space and has one end portion projecting outwardly from the inwardly recessed portion of the casing. The control shaft drivingly supports a park lock mechanism for locking the parking gear. The park lock mechanism is disposed within the reduced container space.

Abstract: A pulley device for a continuously variable transmission includes a shaft having first and second ends, the second end being formed with two axially separated ring grooves. A C-shaped ring is engaged with one of the two ring grooves disposed near to a movable conical plate. A ring-shaped retainer is arranged to restrain radial movement of the C-shaped ring. A snap ring is engaged with the other of the two ring grooves to restrain an axial position of the retainer.

Abstract: The invention relates to a casting core composition including refractory mullite grains and 1.0-2.2 wt % of a phenolic resin for binding the mullite grains. The mullite grains are substantially spherical in shape and have a special grain size distribution. That is, the mullite grains contain first to eighth fractions. These fractions respectively have first to eighth diameters which are respectively within ranges of larger than 420 .mu.m, 297-420 .mu.m 210-297 .mu.m, 149-210 .mu.m, 105-149 .mu.m, 74-105 .mu.m, 53-74 .mu.m, and smaller than 53 .mu.m.