Abstract: Panel assembly for automobiles such as a door panel assembly, a bonnet lid and a trunk lid has an outer and inner panels which are welded together along the peripheral portions. The inner panel is formed at the periphery thereof with one or more projections so that thermally insulative spaces are formed between the panels. The periphery of the outer panel is folded over the periphery of the inner panel so that the edge of the outer panel is laid on the projections and welded thereto at the projections. Due to the existence of the spaces, it is possible to eliminate any thermal deformation of the outer panel caused by the welding heat.

Abstract: The disclosure relates to a method of forming aluminum coating layer on surface of a ferrous base alloy workpiece which includes the steps of applying onto the surface of the ferrous base alloy workpiece a coating solution containing 50 to 90% by weight of aluminum or aluminum alloy particles and 10 to 50% by weight of synthetic resin having a high decomposition burning temperature with slow burning speed and being soluble in a solvent at normal temperature, with subsequent drying to form a resin coating layer containing aluminum on the surface of the ferrous base alloy workpiece, and then subjecting the workpiece thus treated to heating up to temperature higher than melting point of the aluminum or aluminum alloy particles so as to form an Al plated coating layer on the surface of the ferrous base alloy workpiece.

Abstract: Rotary piston engine has a rotor which is applied with coatings of a fluoride resin at each side surface in the vicinity of side seals so as to fill clearance between the rotor side surface and the adjacent inner surface of the side housing whereby an improved gas-tightness is obtained.

Abstract: Cylinder head construction defining a hemispheric combustion chamber which includes a guide wall provided to impart swirl to the incoming air-fuel mixture. The guide wall facing the intake port defined by the cylinder head construction and generally parallel to the line of action of an intake valve provided in the intake port has a height greater than the maximum lift of the intake valve, and decreases in width in the direction of opening of the intake valve. In addition, the size of the area and the position of the guide wall relative to the intake port and the intake valve are maintained in specific ranges, and thus the construction not only permits efficient ignition of a lean air-fuel mixture, but at the same time causes only a slight drop in engine performance.

Abstract: The side housing of a rotary piston engine has an inner surface which has been subjected to a soft-nitriding treatment to form a layer of Fe-C-N type compounds and thereafter ground to provide a surface roughness of between 0.3 and 15 microns. An oil seal which slidably engages the inner surface of the side housing has a sealing lip constituted by a chromium plating. The arrangement provides an improved wear resistance of the oil seal.

Abstract: Rotary piston engine having a substantially polygonal rotor provided at each apex portion with an apex seal and corner seals. The corner seal is so arranged that it is forced under the gas pressure introduced in a space behind it toward the side housing. A filler member comprised of a non-rigid material such as a heat resistant rubber or a suitable composite material is provided in a clearance between the corner seal and an adjacent end of the apex seal so as to prevent gas leakage through the clearance.

Abstract: Ignition plug for a rotary piston engine comprises a central electrode, an insulator disposed around the central electrode and having an end surface which defines a creeping discharge surface, and an outer electrode provided on an outer conductor. The outer electrode is radially inwardly projecting with respect to the radially inner surface of the conductor and has an axially and radially inward edge which is spaced apart from the insulator to provide an air gap for spark discharge and located flush with or axially outwardly of the end surface of the insulator.

Abstract: Rotary piston engine includes a substantially triangular rotor formed with flank cooling oil passages located behind flanks of the rotor. The rotor further has coolant oil passages behind the oil seals at the opposite side surfaces thereof. The flank cooling oil passages are supplied with cooling oil only when the rotor temperature or engine speed is beyond a predetermined value, while the oil seal cooling passages are always supplied with cooling oil so that the rotor flanks can be maintained at a high temperature while preventing the oil seals from being excessively heated.

Abstract: A fuel intake system for a multi-cylinder internal combustion engine includes at least two intake passages leading to respective engine cylinders, and a shutter valve positioned within one of the intake passages for, when closed, allowing the entire amount of a combustible air-fuel mixture to be introduced into one of the engine cylinders communicated with the other of the intake passages. For operating the shutter valve, a composite negative pressure which is made up of a negative pressure, developed within the one of the intake passages at a position downstream of the shutter valve with respect to the direction of flow of the combustible air-fuel mixture towards the engine cylinders, and that developed within the other of the intake passages at a position downstream of a throttle valve, is utilized.

Abstract: An exhuast gas purifying apparatus for use in an automobile multi-cylinder engine of the type which has exhaust ports communicating with engine cylinders and through which exhaust gases are emitted subsequent to combustion of an air-fuel mixture. The exhaust gas purifying apparatus comprising a reducing catalyst unit and a three-way catalyst unit which are disposed in a main exhaust manifold which is connected at one end to a first group of the exhaust ports and at the other end to the atmosphere, and an auxiliary exhaust manifold connected at one end to a second group of the exhaust ports and at the other end to a portion of the main exhaust manifold at a location downstream of the reducing catalyst unit and upstream from the three-way catalyst unit. A pressure operated valve is disposed in a secondary air supply passage for introducing a secondary air into the auxiliary exhaust manifold by the utilization of the pulsating flow of the exhaust gases through the auxiliary exhaust manifold.

Abstract: An exhaust gas purifying apparatus, for use in an automobile multi-cylinder engine of the type which has exhaust port ducts leading from engine cylinders and through which exhaust gases are emitted subsequent to combustion of an air-fuel mixture, the exhaust gas purifying apparatus having a reducing catalyst unit and an oxidizing catalyst unit disposed in a main exhaust manifold which is corrected on one side, to a first group of the exhaust port ducts and, on the other side to the atmosphere, an auxiliary exhaust manifold is connected, on one side to a second group of the exhaust port ducts and on the other side to a portion of the main exhaust manifold which is downstream from the reducing catalyst unit and upstream of the oxidizing catalyst unit.

Abstract: For use in an automobile multi-cylinder engine having exhaust ports leading from engine cylinders and through which exhaust gases are emitted, an exhaust gas purifying apparatus comprising a reducing catalyst unit and an oxidizing catalyst unit disposed in a main exhaust manifold communicated through exhaust ducts to a first group of the exhaust ports and, on the other hand, to the atmosphere, an auxiliary exhaust manifold communicated to a second group of the exhaust port and, on the other hand, to a portion of the main exhaust manifold at a position intermediately between the reducing and oxidizing catalyst units, a secondary air supply passage extending from a source of secondary air to the auxiliary exhaust manifold, and an additional secondary air supply passage extending from the secondary air source to any one of the collecting ducts communicated to the exhaust ports of the first group.

Abstract: For use in an automobile multi-cylinder engine having exhaust port ducts leading from engine cylinders and through which exhaust gases are emitted subsequent to combustion of air-fuel mixture, an exhaust gas purifying apparatus which has a reducing catalyst unit and an oxidizing catalyst unit disposed in a main exhaust manifold connected on one hand to a first group of the exhaust port ducts and on the other hand to the atmosphere, and an auxiliary exhaust manifold connected on one hand to a second group of the exhaust port ducts and on the other hand to a portion of the main exhaust manifold at a position downstream of the reducing catalyst unit and upstream of the oxidizing catalyst unit. The apparatus further has a pressure operated valve disposed in a secondary air supply passage for introducing secondary air into the auxiliary exhaust manifold by the utilization of a pulsating flow of the exhaust gases through the auxiliary exhaust manifold.

Abstract: In combination with an internal combustion engine having a throttle valve disposed in an intake manifold, an evaporative emission control device for controlling the emission to the atmosphere of fuel vapors from an internal combustion engine fuel system which comprises an air cleaner housing having a primary air intake conduit, a gating valve operatively disposed in the primary air intake conduit for selectively opening and closing the primary air intake conduit, a diaphragm valve assembly for bringing the gating valve means in position to open the primary air intake duct when a negative pressure developed in the intake manifold is induced in a working chamber, a fluid passage extending between the working chamber and the intake manifold, and a delay unit operable, when the negative pressure in the intake manifold decreases, for delaying a corresponding decrease of the once-induced negative pressure in the working chamber for a predetermined time to maintain the gating valve in the opened position.

Abstract: Apparatus for resiliently mounting an oil pan to an engine crankcase, which eliminates oil pan vibration and prevents oil leakage. A first resilient member is located between the crankcase and the pan and a second resilient member is located between the pan and a depressing plate. The second resilient member has a coefficient of elasticity greater than that of the first resilient member, so as to resist compressive deformation. The depressing plate is provided with an upwardly bent edge which also aids in preventing compressive deformation of the second resilient member.

Abstract: In an automobile having a rear opening adapted to be closed by a rear door, a locking device for the door which comprises a striker on the car body, a latch lever provided on the door for engagement with the striker, a claw lever provided on the door for releasably holding the latch lever in a locking position, an unlocking lever adapted for engagement with the claw lever, and a push button type actuating member for actuating the unlocking lever so that the latter drives the claw lever so as to let it release the latch lever for unlocking movement. The unlocking lever and the actuating member are both mounted on the outer panel of the door so that unlocking movement is not produced when the outer panel is deformed in a crash from behind.

Abstract: Cylinder head construction defining a hemispheric combustion chamber and including a guide wall facing an intake port to impart swirl to an incoming air-fuel mixture and permit use of a lean air-fuel mixture. The position of the guide wall relative to the cylinder center and relative disposition of the guide wall and a spark plug are made such that although the guide wall is effective in imparting swirl, a flame front may be efficiently propagated to all parts of the combustion chamber subsequent to ignition of the air-fuel mixture therein, whereby provision of the guide wall does not result in increased emission of hydrocarbon compounds in exhaust gas or formation of carbon deposits in the combustion chamber.

Abstract: A rear compartment arrangement for a van type motor vehicle or automobile which is composed of a reclinable seat including separable cushioning and reclining seat-portions and two pairs of supporting members, each pair attached to the respective inner surfaces of a pair of side body panels, the supporting member extending horizontally in the direction of driving and positioned vertically with respect to each other in parallel relation, wherein when the seat-portions are disassembled they are supported on the supporting members in the direction of driving by the two upper supporting members of each pair by engagement of respective lugs which are provided on the seat-portions in grooves which are provided on the supporting members, so that the rear compartment is for example, divided into two spaces which are superposed one on top of the other.

Abstract: Internal combustion engine having a primary and a secondary intake passage for each cylinder, the passages opening to the combustion chamber through a common intake port having an intake valve. A substantially radially extending partition plate is disposed at the intake port so as to separate the two passages one from the other when the intake valve is closed.

Abstract: Disclosed is an automobile having front and rear seat structures, the rear seat structure comprising forward and rearward rows of folding seats. The forward and rearward rows of seats of the rear seat structure are interconnected in such a manner that the rearward row can be moved towards the forward row, and then both the forward and rearward rows can be moved towards the front seat structure to provide a substantially unobstructed space behind the folded rows of seats.