Abstract: A case for rotating integrally with a crankshaft of an engine; a rotor housed in the case, to be rotated integrally with a camshaft of the engine by fastening the rotor coaxially to the camshaft with a center bolt; and a groove provided around an axis of the rotor on an opposite side of the rotor to the camshaft, and having an inner wall intersecting a rotation direction of the rotor are provided.

Abstract: A case for rotating integrally with a crankshaft of an engine; a rotor housed in the case, to be rotated integrally with a camshaft of the engine by fastening the rotor coaxially to the camshaft with a center bolt; and a groove provided around an axis of the rotor on an opposite side of the rotor to the camshaft, and having an inner wall intersecting a rotation direction of the rotor are provided.

Abstract: A solenoid valve 30 includes a spool 41 moving within a valve housing 40 in a direction of an axis thereof to adjust a fed or discarded amount of a working fluid flowing via ports 43 to 47 formed in the valve housing 40 according to an amount of the movement, and including lands 41a, 41b, 41c, and 41d and recessed portions 41e, 41f, and 41g for connecting the lands with one another, and a solenoid unit 50 containing a moving member of a magnetic circuit for driving the spool 41. In edge portions 41b? and 41c? of the lands 41b and 41c or in hole edge portions of the valve housing corresponding to the edge portions 41b? and 41c?, notch portions 60 or taper grooves 61, or penetrating holes 62 for adjusting the amount of the working fluid which is close to a central current value are formed.

Abstract: A positioning pin 31 is inserted in a pin insertion hole 30 penetrating through a rotor 3 in an axial direction, and has both end portions held by a housing 1 and a cover 12 to prevent falling out thereof. A protrusion 31a of the positioning pin 31 protruding toward an inner side of a camshaft fitting recess 3g is engaged with a pin engagement groove 110 recessed on an outer circumference surface of an intake side camshaft 100, whereby the rotor 3 and the intake side camshaft 100 are positioned in a rotation direction.

Abstract: A positioning pin 31 is inserted in a pin insertion hole 30 penetrating through a rotor 3 in an axial direction, and has both end portions held by a housing 1 and a cover 12 to prevent falling out thereof. A protrusion 31a of the positioning pin 31 protruding toward an inner side of a camshaft fitting recess 3g is engaged with a pin engagement groove 110 recessed on an outer circumference surface of an intake side camshaft 100, whereby the rotor 3 and the intake side camshaft 100 are positioned in a rotation direction.

Abstract: A part of drain oil discharged from a retard hydraulic chamber 34 and led out of a port 21 to a port 20 is introduced through oil introduction grooves 18, which are provided in the outer periphery of a land portion 17a of a spool valve 17, into a slide bearing portion 14d between a cup member 14 and a plunger 15 and caused to serve as lubricating oil. In addition, foreign substances in the cup member 14 are discharged from a cup hole 14b to a cup outside space B as the plunger 15 reciprocatingly slides.

Abstract: A valve timing adjusting apparatus includes: recesses provided opposite to the wall surfaces in a circumferential direction of a shoe and a vane in an advance hydraulic chamber; a holding member insertion-disposed into the recesses from an axial direction; and an assist spring disposed between the holding member on the shoe side and the holding member on the vane side to urge a rotor in an advance direction, and further a clearance formed by a length in the axial direction of the holding member provided on the vane side and a length in the axial direction of the case is set to not less than a sum of an increment of the length in the axial direction in consideration of a tilt of the holding member produced by a gap between the holding member and recess, and an increment due to the thermal expansion.

Abstract: A solenoid valve 30 includes a spool 41 moving within a valve housing 40 in a direction of an axis thereof to adjust a fed or discarded amount of a working fluid flowing via ports 43 to 47 formed in the valve housing 40 according to an amount of the movement, and including lands 41a, 41b, 41c, and 41d and recessed portions 41e, 41f, and 41 g for connecting the lands with one another, and a solenoid unit 50 containing a moving member of a magnetic circuit for driving the spool 41. In edge portions 41b? and 41e of the lands 41b and 41c or in hole edge portions of the valve housing corresponding to the edge portions 41b? and 41c?, notch portions 60 or taper grooves 61, or penetrating holes 62 for adjusting the amount of the working fluid which is close to a central current value are formed.

Abstract: A bolt is configured to be engaged by an axial-force-detective fastening tool which fastens a nut to the bolt, and at the same time, detects and axial force acting on the bolt. The bolt includes a sensor engaging surface which is engaged by the ultrasonic sensor and is recessed in a tapered opening in an end of the bolt. The tool has a socket body rotatably supported with a tool body and having a nut receiver. The socket body turns a nut received in the nut receiver around an axis of the socket body, to fasten the nut to a bolt. An ultrasonic sensor is supported with the tool body, is movable along an axis of the socket body, and is brought into contact with a sensor engaging of a front end of the bolt in the nut receiver. The ultrasonic sensor emits and receives ultrasonic waves to detect an axial force acting on the bolt. A sensor spring pushes the ultrasonic sensor to the front end of the bolt.

Abstract: An axial-force-detective fastening tool fastens a nut to a bolt, and at the same time, detects and axial force acting on the bolt. The tool has a socket body rotatably supported with a tool body and having a nut receiver. The socket body turns a nut received in the nut receiver around an axis of the socket body, to fasten the nut to a bolt. An ultrasonic sensor is supported with the tool body, is movable along an axis of the socket body, and is brought into contact with a front end of the bolt in the nut receiver. The ultrasonic sensor emits and receives ultrasonic waves to detect an axial force acting on the bolt. A sensor spring pushes the ultrasonic sensor to the front end of the bolt. The bolt includes a reference surface which is engaged by the ultrasonic sensor and is recessed in a tapered opening in an end of the bolt.

Abstract: An axial-force-detective fastening tool fastens a nut to a bolt, and at the same time, detects and axial force acting on the bolt. This tool has improved durability and workability. The tool has a socket body rotatably supported with a tool body and having a nut receiver. The socket body turns a nut received in the nut receiver around an axis of the socket body, to fasten the nut to a bolt. A driver is installed in the tool body, to rotate the socket body. An ultrasonic sensor is supported with the tool body, is movable along the axis of the socket body, and is brought into contact with a front end of the bolt in the nut receiver. The ultrasonic sensor emits and receives ultrasonic waves to detect an axial force acting on the bolt. A sensor spring pushes the ultrasonic sensor to the front end of the bolt.

Abstract: A valve timing control device according to the present invention has a between-sealing-faces clearance defined between a frontal end of each shoe of a first rotor and an outer periphery of a boss section of a second rotor corresponding to the frontal end of the shoe and accepting the quantity of oil leaks having no effect on the responsibility of the device as a maximum value. The between-sealing-faces clearance is so set as to be larger than the maximum bearing clearance defined between the camshaft and a bearing section of the device supporting rotationally the camshaft.

Abstract: A valve timing control device is mounted on an end of a camshaft having a plurality of cams opening and closing an intake or exhaust valve of an internal combustion engine to modify timing for the opening and closing of the intake or exhaust valve by way of a tappet. The device includes a bias means biasing the camshaft in an advanced direction with a biasing force approximately equal to or smaller than a peak value of frictional torque produced between a cam of the camshaft and the tappet.

Abstract: A valve timing control device according to the present invention has a between-sealing-faces clearance defined between a frontal end of each shoe of a first rotor and an outer periphery of a boss section of a second rotor corresponding to the frontal end of the shoe and accepting the quantity of oil leaks having no effect on the responsibility of the device as a maximum value. The between-sealing-faces clearance is so set as to be larger than the maximum bearing clearance defined between the camshaft and a bearing section of the device supporting rotationally the camshaft.

Abstract: A valve timing adjusting apparatus including a locking hole 8 formed in the external peripheral surface P of the boss of a rotor 3, into which the end portion of a locking pin 7a of the locking mechanism 7 is fitted when the rotor 3 is at the most advanced position. A stepped portion 9 is formed in the external peripheral surface of the rotor in a continuing manner from the locking hole 8 at a position deviated from the locking hole either in the advancing direction or the retarding direction in such a manner that it is formed lower than the external peripheral surface P, yet higher than the bottom of the locking hole 8, having two tapers 10, 11 respectively at the border between the stepped portion 9 and the external peripheral surface P, and that between the stepped portion 9 and the locking hole 8.

Abstract: A valve timing control device includes a lock member and a push member. The lock member locks a rotor in relation to a case at an approximately intermediate position apart from both of the maximum advanced side position and the maximum retarded side position. At all times, the push member pushes the lock member in a direction of fitting the lock member in the fitting hole arranged at any one hand of the rotor or the case. A release hydraulic pressure for releasing the fitting state of the lock member in the fitting hole against the push force of the push member is set to be higher than a lock hydraulic pressure for allowing the fitting state of the lock member in the fitting hole.

Abstract: A valve timing regulation device for regulating the timing of the opening and closing of the valves in an internal combustion engine, includes: a rotor urging member 40, 41 for urging the rotor 18 toward a predetermined lock position with respect to the housing 16; and holder members 38, 39 which support both ends of the rotor urging member 40, 41 on the wall surfaces of the shoe 22 of the housing 16 and the vane 23 of the rotor 18. Such an arrangement allows assembly of the rotor urging member 40, 41 into an advancing hydraulic chamber 24 formed between the shoe 22 and the vane 23. Thus, it is not required to provide an urging member storage chamber for assembling the rotor urging member 40, 41 as a separate component, and therefore it is possible to downsize the valve timing regulation device. Furthermore, it is possible to suppress wear on both ends of the rotor urging member 40, 41 due to friction with the shoe 22 and the vane 23 by the holder members 38, 39.

Abstract: A valve timing control device includes a lock member and a push member. The lock member locks a rotor in relation to a case at an approximately intermediate position apart from both of the maximum advanced side position and the maximum retarded side position. At all times, the push member pushes the lock member in a direction-of fitting the lock member in the fitting hole arranged at any one hand of the rotor or the case. A release hydraulic pressure for releasing the fitting state of the lock member in the fitting hole against the push force of the push member is set to be higher than a lock hydraulic pressure for allowing the fitting state of the lock member in the fitting hole.

Abstract: In a valve timing adjusting apparatus, a locking hole 8 is formed in the external peripheral surface P of the boss of a rotor 3, into which the end portion of a locking pin 7a of the locking mechanism 7 is fitted when the rotor 3 is at the most advanced position, and in the external peripheral surface of the rotor, there is further formed a stepped portion 9 in a continuing manner from the locking hole 8 at a position deviated from the locking hole either in the advancing direction or the retarding direction in such a manner that it is formed lower than the external peripheral surface P, yet higher than the bottom of the locking hole 8, having two tapers 10, 11 respectively at the boarder between the stepped portion 9 and the external peripheral surface P, and that between the stepped portion 9 and the locking hole 8.