Abstract: An intake heating device of an engine, comprising a hollow heater vessel placed in the intake passage. The heater vessel comprises an inner pipe, an outer pipe, and a plurality of PTC elements. The inner pipe and the outer pipe are interconnected to each other in such a way that the upper end and the lower end of the inner pipe are bent outwards and pressed onto the outer wall of the outer pipe.

Abstract: An intake heating device of an engine, comprising a hollow heater vessel placed in the intake passage. The heater vessel comprises an inner pipe, an outer pipe, and a plurality of PTC elements inserted between the inner pipe and the outer pipe. The outer wall of the inner pipe is surrounded by a belt-like insulating member having a plurality of rectangular holes. The PTC elements are inserted into the rectangular holes and held in a predetermined position by the insulating member.

Abstract: A changeover valve unit for a power-assisted steering system includes input and output shafts arranged for relative rotation on aligned axes, a spool valve element concentrically assembled with the input shaft to be axially shifted in response to relative rotation of the shafts, and a sleeve-like valve casing surrounding the spool valve element to cooperate with the spool valve element for controlling the supply of fluid under pressure to a hydraulic cylinder associated with the steering system. A thrust plate is rotatably coupled at its inner periphery with the output shaft and secured at its outer periphery to the valve casing thereby to prevent rotation of the valve casing and to permit axial movement of the valve casing caused by displacement of the output shaft.

Abstract: A power steering device includes a steering shaft assembly, a driven member for operative connection with the steering road wheels for a vehicle and operatively connected with the steering shaft assembly, an hydraulic cylinder of actuating the driven member by fluid under pressure supplied thereto, an hydraulic circuit connecting the cylinder to a source of fluid pressure, and a switching valve having a valve member to be moved in response to rotation of the shaft assembly in an axial direction, the valve disposed within the hydraulic circuit to control the supply of fluid under pressure in response to axial movement of the valve being member. A cam mechanism is associated with the steering shaft assembly to conduct the axial movement of the valve member in response to rotation of the steering shaft assembly.

Abstract: Disclosed is a fluid coupling which includes: a housing being used as a rotary driving member; a rotor rotatably mounted in the housing and being used as a driven member, a fluid pump having a pump chamber defined between the housing and the rotor; a fluid inlet port and a fluid outlet port; and a fluid circulation passage between the chamber and the housing, such that fluid in the pump circulates from the fluid circulation passage into the pump chamber through the inlet port and from the pump chamber through the outlet port into the fluid passage.

Abstract: A valve device for an exhaust gas recirculation system of an internal combustion engine, which device has a diaphragm mechanism having a diaphragm to form at least one chamber which is connected to an engine port and has a valve member connected to said diaphragm via a rod to open the valve member against a force caused by a spring acting on the diaphragm, when a vacuum signal of a predetermined level is transmitted from the engine port. The device includes means for allowing adjustment of the position of the diaphragm with respect to the rod and means for securing the diaphragm to the rod after said adjustment of the position of the rod is perfected. Therefore, the EGR valve which is opened at the constant vacuum level can be obtained, with a minimum number of parts requiring high accuracy.

Abstract: A flow control valve for an exhaust gas recirculation apparatus is provided with an exhaust gas pressure control means for maintaining a predetermined constant pressure of exhaust gas to be recirculated. The flow control valve is adpated to control an amount of the exahust gas to be directed to the pressure controlling means, for performing an ideal EGR operation. A detailed design of the flow control valve is provided for solving the problems which may occur during the actual use of the flow control valve.

Abstract: A composite valve made of a first dish-like member having an open face and concaved portions defining diaphragm chambers, a second dish-like member having an open face and concaved portions defining complex passages, an intermediate member having opposite open faces opposing the open faces of the first and second dish-like members and complex partitions defining bearing portions and complex passages, a diaphragm element interposed between the first dish-like member and the intermediate member, valve elements slidably mounted in the bearing portion and connected to the diaphragm element, and valve seat elements interposed between the second dish-like element and the intermediate member and providing valve seats.

Abstract: A valve device for an exhaust gas recirculation system of an internal combustion engine, which device has a diaphragm mechanism having a diaphragm to form at least one chamber which is connected to an engine port and has a valve member connected to said diaphragm via a rod to open the valve member against a force caused by a spring acting on the diaphragm, when a vacuum signal of a predetermined level is transmitted from the engine port. The device includes means for allowing adjustment of the position of the diaphragm with respect to the rod and means for securing the diaphragm to the rod after said adjustment of the position of the rod is perfected. Therefore, the EGR valve which is opened at the constant vacuum level can be obtained, with a minimum number of parts requiring high accuracy.

Abstract: An exhaust gas recirculation valve device for an exhaust gas cleaning apparatus of an internal combustion engine for an automobile, which device comprises a diaphragm mechanism mounted on a body for operating the valve device. The diaphragm mechanism has a diaphragm and has, on both sides of the diaphragm, chambers which should be connected to the respective engine ports. One of the chambers, on the side of the diaphragm facing the surface of the body, is formed by a bellows member, made of rubber material, which is held apart from the surface of the body so that the bellows is effectively insulated from the high temperature of the body caused by the high temperature exhaust gas passing through the body.