Abstract: The object of the present invention is to provide a high-pressure fuel supply apparatus, in which the durability of the fuel sealing section is improved and additionally the evaluation time is reduced. The high-pressure fuel supply apparatus comprises a piston having a plunger supported slidably within a cylinder and a tappet, a casing for preventing the fuel leaking out of the space between the cylinder and the piston from leaking outside by surrounding substantially the cylinder and the piston, and a sealing means for sealing the space between the casing and the piston, wherein the sealing means is fastened to the casing and brought into a slidable contact with the tappet of the piston.

Abstract: In a non-contact type rotation-angle sensing device, a rotation angle sensor (9) having magnetoresistance elements detects a rotation angle of an object to be measured. The object is rotatable round a rotary shaft (2) with respect to the rotation angle sensor (9) and includes a permanent magnet (5, 6). The permanent magnet (5, 6) is disposed symmetrically about said rotary shaft (2) of said object, and a magnetic element (7, 8) is disposed on said object between said permanent magnet (5, 6) and the magnetoresistance elements. In the non-contact type rotation-angle sensing device of above constitution according to the invention, linearity is secured by reducing magnetic hysteresis of the sensor output with respect to the rotation angle, thus a small-sized permanent magnet and reduction in cost being achieved.

Abstract: An electromagnetic valve with improved performance includes a solenoid coil 4, and a rod arranged on an axis of the solenoid coil 4 for movement in an axial direction thereof. A plunger 18 is fixedly attached to an intermediate portion of the rod. A core 6 is arranged at one side of the rod so as to surround it and operated to attract the plunger upon energization of the solenoid coil. A yoke 7 is arranged at the other side of the plunger so as to surround it. A pair of bearings 9a, 9b formed of a non-magnetic substance are arranged at opposite sides of the plunger, respectively, for movably supporting the rod at an outer peripheral surface thereof by clearance fit. The pair of bearings are clearance fitted to an inner peripheral surface of the core or to an inner peripheral surface of the yoke.

Abstract: An intake air control apparatus for an engine is capable of suppressing the influence of external magnetic flux from outside thereby to prevent a variation in an output of a rotational angle detection sensor due to the external magnetic flux. A permanent magnet is provided on an end portion of a shaft. A rotational angle detection sensor is disposed in a spaced parallel relation with respect to the permanent magnet, and has a magnetoresistive element for detecting a change in direction of a magnetic flux of the permanent magnet thereby to detect a rotational angle of a throttle valve. A bypass member is disposed to enclose the rotational angle detection sensor with its side near the permanent magnet apertured to form an opening surface, the bypass member being made of a magnetic material which is adapted to form a bypass path for the magnetic flux from the permanent magnet.

Abstract: An intake air control apparatus for an engine can relax the tolerance of positional accuracy in the mounting of a rotational angle detection sensor. The intake air control apparatus includes: a shaft (6); a throttle valve (7) fixedly secured to the shaft (6) for adjusting the degree of opening in an intake passage through a rotational angle thereof; a permanent magnet (12) provided on an end portion of the shaft (6) with its N pole and S pole being positioned in a diametral direction thereof; and a rotational angle detection sensor (14) having a magnetoresistive element disposed in a spaced parallel relation with respect to the permanent magnet (12) for detecting a change in the azimuth of magnetic flux of the permanent magnet (12) thereby to sense a rotational angle of the throttle valve (7).

Abstract: An electromagnetic valve can be reduced in size, and improved in the machinability and workability of a body thereof. A plunger (40) is arranged on an axis of a solenoid (47) for axial movement, and a body (41) with the plunger (40) slidably received therein is fixedly arranged in a housing (44). A valve seat (42) is arranged in opposition to one end of the plunger (40) in such a manner that the one end of the plunger (40) is moved to contact with and separate from the valve seat (42). The plunger (40) is urged toward the valve seat (42) by means of a spring (48). The body (41) is formed with an engagement groove (50), into which a caulking portion (51), which is formed by bending or flexing the one end of the housing (44), is engaged to integrally couple the body (41) and the housing (44) with each other.

Abstract: A high-pressure fuel supply system can reduce collision sounds generated when a plunger collides with a stopper. An electromagnetic valve includes a plunger, a valve seat with which the plunger is moved into and out of contact so that the valve seat is placed into communication with a pressurization chamber when the plunger is moved apart from the valve seat, a stopper for limiting the separation of the plunger from the valve seat, an armature made of a magnetic material and fixedly secured to the plunger, a core arranged in opposition to the armature, a solenoid wound around the core for attracting the armature toward the core through an electromagnetic force when energized, and a spring for urging the plunger toward the valve seat. A groove is formed near opposed surfaces of the armature and core for magnetically saturating a portion of a magnetic circuit generated by energizing the solenoid.

Abstract: In a proportional solenoid valve, a valve drive portion that includes a coil, a core that is excited by application of a current to the coil, a plunger that is displaced by a magnetic attraction force generated by the excited core, and a spring that biases the plunger in a direction in which a distance to the core is increased. The spring is set so that a space is maintained between the plunger and an attraction surface of the core when the spring is fully compressed.

Abstract: In a proportional solenoid valve, a cylindrical valve seat member includes an input/output-side passage provided between an input port and a drain port and between an output port and the drain port, a seat portion provided in an end portion of the input/output-side passage, and a drain-side passage provided between the seat portion and the drain port. The drain-side passage is formed by exhaust passage holes whose number is an even number equal to four or more and which are arranged at regular intervals in the circumferential direction of the valve seat member.

Abstract: In a proportional solenoid valve, a solenoid main body includes a coil, a valve seat member having a seat portion, a valve element that is displaced in accordance with a current applied to the coil so as to be brought into and out of contact with the seat portion, and a valve guide portion that is arranged coaxially with the seat portion and guides the displacement of the valve element. The housing is attached to the solenoid main body so that a space is formed between the housing and the valve seat member. A seal member made of an elastic material is provided in the space between the housing and the valve seat member.

Abstract: A high pressure fuel supply apparatus 6 has a plunger 161 reciprocating and sliding in a sleeve 160 of a high pressure fuel pump 16 to form a fuel pressurizing chamber 163 between the plunger 161 and the sleeve 160 to discharge pressurized fuel; a bolt 180 forming a part of a housing of the high pressure fuel pump 16; and an oil seal 169 fixed to an inner wall surface of the bolt 180 by press fitting to slide on an outer circumferential wall of the plunger 161 in accordance with reciprocating motion of the plunger 161 to seal the fuel and lubricating oil; wherein the bolt 180 is formed so that a press-in load in a second half of a press-in stroke of the seal 169 is higher than that in a first half thereof in an abutment portion of the bolt 180 against the seal 169.

Abstract: A high-pressure fuel pump of a simple construction is capable of distributing the position of contact between a tappet and a cam so as to improve durability of the tappet without causing seizure of a piston. A cylinder is arranged in a housing, and the piston is received in the cylinder for sliding reciprocation so that fuel is sucked into the cylinder and pressurized by the piston. The tappet is arranged inside one end of the housing for reciprocation, and contacts the cam, which rotates with a camshaft of an engine, so as transmit a driving force of the engine to the piston. A sleeve is arranged between the tappet and the housing, and clearance fitted to an outer peripheral surface of the tappet and an inner peripheral surface of the housing. The tappet is caused to rotate on its own axis by a frictional force generated between the cam and the tappet.

Abstract: A fuel supply apparatus capable of reducing the abrasion of a driving cam and a tappet without increasing the dimensions and weight of the apparatus. This fuel supply apparatus is provided with a tappet which has a pressure receiving surface contacting the driving cam of an engine. The tappet is provided at the part of a outer surface thereof which is in the vicinity of an outer circumference of the pressure receiving surface with a groove adapted to prevent the local concentration of stress on the tappet and having a V-shaped, semicircular or U-shaped cross section.

Abstract: The present invention provides a fuel supply apparatus which has solved the problem occurring after the welding of a connecting ring, by which a core of an electromagnetic valve and a housing are connected together, finishes of the deformation of the connecting ring and a crack in a welded portion. In this apparatus, the core of the electromagnetic valve and housing are welded together at a welded portion via the connecting ring having an L-shaped cross-sectional shape. A groove for at least reducing the degree of the deformation, which occurs after the welding thererof is done, of the connecting ring, preferably a groove having a projecting open surface is formed on the portion of the surface of the housing which is in the vicinity of the welded portion.

Abstract: A high-pressure fuel supply system can reduce the generation of noise upon opening and closing of an electromagnetic valve. The electromagnetic valve (100) of the high-pressure fuel supply system includes a body (41), a plunger (40) slidably received in the body (41), a valve seat (42) with which an end of the plunger is caused to move into and out of contact so that the valve seat is placed into fluid communication with a fuel pressurization chamber (27) when the plunger is moved apart from the valve seat, a stopper (43) for limiting the distance of separation of the plunger from the valve seat, and a spring (48) for urging the plunger in a direction toward the valve seat. An elastic O ring (101) is provided around the valve seat for absorbing collision sounds generated when the plunger collides with the valve seat.

Abstract: A high pressure fuel supply apparatus 6 having: a plunger 161 reciprocating and sliding in a sleeve 160 of a high pressure fuel pump 16 so as to form a fuel pressurizing chamber 163 between the plunger 161 and the sleeve 160 to thereby discharge pressurized fuel; a tappet 164 reciprocated while abutting against the plunger 161; and a cam 100 abutting against the tappet 164 so as to reciprocate the tappet 164 and the plunger 161; wherein the tappet 164 has a recess portion 164a formed near a central portion of an abutment surface of the tappet 164 against the plunger 161.

Abstract: A high pressure fuel supply apparatus 6 has a plunger 161 reciprocating and sliding in a sleeve 160 of a high pressure fuel pump 16 to form a fuel pressurizing chamber 163 between the plunger 161 and the sleeve 160 to discharge pressurized fuel; a bolt 180 forming a part of a housing of the high pressure fuel pump 16; and an oil seal 169 fixed to an inner wall surface of the bolt 180 by press fitting to slide on an outer circumferential wall of the plunger 161 in accordance with reciprocating motion of the plunger 161 to seal the fuel and lubricating oil; wherein the bolt 180 is formed so that a press-in load in a second half of a press-in stroke of the seal 169 is higher than that in a first half thereof in an abutment portion of the bolt 180 against the seal 169.

Abstract: A high-pressure fuel supply system can reduce the generation of noise upon opening and closing of an electromagnetic valve. The electromagnetic valve (100) of the high-pressure fuel supply system includes a body (41), a plunger (40) slidably received in the body (41), a valve seat (42) with which an end of the plunger is caused to move into and out of contact so that the valve seat is placed into fluid communication with a fuel pressurization chamber (27) when the plunger is moved apart from the valve seat, a stopper (43) for limiting the distance of separation of the plunger from the valve seat, and a spring (48) for urging the plunger in a direction toward the valve seat. An elastic O ring (101) is provided around the valve seat for absorbing collision sounds generated when the plunger collides with the valve seat.

Abstract: A high-pressure fuel supply system can reduce collision sounds generated when a plunger collides with a stopper. An electromagnetic valve includes a plunger, a valve seat with which the plunger is moved into and out of contact so that the valve seat is placed into communication with a pressurization chamber when the plunger is moved apart from the valve seat, a stopper for limiting the separation of the plunger from the valve seat, an armature made of a magnetic material and fixedly secured to the plunger, a core arranged in opposition to the armature, a solenoid wound around the core for attracting the armature toward the core through an electromagnetic force when energized, and a spring for urging the plunger toward the valve seat. A groove is formed near opposed surfaces of the armature and core for magnetically saturating a portion of a magnetic circuit generated by energizing the solenoid.

Abstract: The electromagnetic valve for use in a high pressure fuel supply apparatus includes an electromagnetic valve main body including a fuel passage to be connected between the high and low pressure sides of the fuel supply apparatus, a valve seat disposed in the fuel passage, a valve member disposed within the electromagnetic valve main body in such a manner that it is detached from and contacted with the valve seat to thereby open and close the fuel passage, and a solenoid coil for moving the valve member with respect to the valve seat. The electromagnetic valve is capable of maintaining the jet-out quantity of the fuel from the high pressure fuel supply apparatus at a given value.