Abstract: A valve timing adjusting device including a first rotor, a lock pin for locking a relative rotation between the first rotor and a second rotor at the most advanced position, and operating by fluid control pressure to release the lock, wherein rotor start-up delaying means is provided for operating the lock pin by the fluid control pressure in the lock releasing direction, and then rotating the second rotor in the lagged direction when the second rotor starts rotating from the most advanced position to the lagged direction.

Abstract: A region including an engaging hole is given surface treatment such as partial quench hardening by induction hardening for improving surface hardness of the region. The partial quench hardening by induction hardening provides the region with satisfactory mechanical strength or surface hardness enough for resisting deformation of the engaging hole and wear-out of an edge of opening of the engaging hole caused by putting in and out of the lock pin.

Abstract: A valve timing adjusting system 1 includes a first valve timing adjusting device 6 changing a relative rotational of an intake camshaft S3 relative to a crank shaft S1, and also a second valve timing adjusting device 7 having a first rotor 71 transmitting the rotatory driving force derived from the crank shaft S1 to the device 6 via a chain 9a, and a second rotor 72 secured on an exhaust camshaft S4 rotating synchronously with the crank shaft S1.

Abstract: A lock pin is slidably provid d in a radial dir ction of an apparatus side, within a lock pin receiving hole in a first rotor. Within a slider receiving hole in a rotor as a second rotor is provided a slider (closing member) slidable in an axial direction of the slider receiving hole, and a bush is press-fitted into a position in the proximity of the outer peripheral surface of the rotor, in the slider receiving hole. On the bush is formed an engaging hole passing through the bush along its axial direction and engaging therein the lock pin. The slider slides by hydraulic pressure to push the lock pin engaged with the engaging hole out of the hole, and close the engaging hole.

Abstract: A seal member of a seal unit of a valve timing adjusting device has foot portions and protrusive guides protruding from a seal reverse plane along internal surfaces of the foot portions. A plate spring of the seal unit has foot portions and fork portions arranged on top ends of the foot portions. A slit is formed in each fork portion to allow the insertion of the protrusive guide when the plate spring is fitted to the seal member. The positional relationship between the slit and the protrusive guide is determined on condition that the plate spring fitted to the seal member does not detach from the seal member and the plate spring does not collide with the protrusive guide when the plate spring is bent to arrange the seal unit in the valve timing adjusting device. When the plate spring is fitted to the seal member, the slits of the fork portions are positioned just above the protrusive guides, and the plate spring is dropped according to the gravitational force.

Abstract: The invention provides an injection molding apparatus for seal member in which a seal member being a molding is left on the moving side without fail when opening a stationary mold and a moving mold. In the injection molding apparatus for seal member according to the invention, a molten resin is injected by way of a gate 59 into a cavity 58, the injected molten resin is cut by a gate seal pin 66 provided on the moving side while sealing the gate, and under the condition that the moving mold is opened from the stationary mold, a seal member 35 remaining in the moving side is ejected by ejector pins 68 provided on the moving side, thus the seal member 35 is molded; wherein on the moving mold 54, convex portions for forming recesses of wall thickness is formed at portions not serving as sealing faces of the seal member 35.

Abstract: A plate spring is pre-assembled as a unit into a seal member which contains the section between an advancing oil pressure chamber and a retarding oil pressure chamber in a valve timing regulation device. Both the seal member and the plate spring are adapted to be inserted integrally between the sliding faces of the first rotating body and the second rotating body of the valve timing regulation device. Furthermore it is possible to facilitate the insertion of these components. The detachment of the plate spring 32 which is fitted into the indented inner section of the seal member 27 is suppressed and a spring detachment prevention means 31a, 31b which allows displacement due to resilient deformation of the plate spring 32 is provided in the seal member 27.

Abstract: A valve timing control device includes a purge path communicating between a hydraulic chamber allowing the entry of hydraulic pressure on starting an engine and a backward pressurized section in an accommodation hole. When the hydraulic chamber allowing the entry of hydraulic pressure on starting the engine is the retardation side hydraulic chamber, a hydraulic pressure derived from an oil pump is supplied to the retardation side hydraulic chamber on starting the engine. On the way, air-mixed oil is discharged to outside of the device by way of a purge path, a backward pressurized section in the accommodation hole and the discharge hole. When the air is discharged, a residual pressure is produced in the backward pressurized section due to oil supplied thereto. The residual pressure results in the increase of an unlocking hydraulic pressure to prevent a locking member from being unlocked.

Abstract: A plate spring is pre-assembled as a unit into a seal member which contains the section between an advancing oil pressure chamber and a retarding oil pressure chamber in a valve timing regulation device. Both the seal member and the plate spring are adapted to be inserted integrally between the sliding faces of the first rotating body and the second rotating body of the valve timing regulation device. Furthermore it is possible to facilitate the insertion of these components. The detachment of the plate spring 32 which is fitted into the indented inner section of the seal member 27 is suppressed and a spring detachment prevention means 31a, 31b which allows displacement due to resilient deformation of the plate spring 32 is provided in the seal member 27.

Abstract: A valve timing control device includes a first rotor, a second rotor, a fitting hole, a tier control member, an accommodation hole, a first release hydraulic pressure chamber and a second release hydraulic pressure chamber. The first rotor rotates in synchronization with a crankshaft of an internal combustion engine and has a plurality of shoes, which are projected inwardly to define a plurality of hydraulic pressure chambers. The second rotor is fixed at an end of a camshaft of the internal combustion engine and has a plurality of vanes which partition the plural hydraulic pressure chambers of the first rotor into an advance side hydraulic pressure chamber and a retardation side hydraulic pressure chamber. The fitting hole is disposed at any one of the first rotor or the second rotor. The tier control member fits in the fitting hole to control a relative rotation of the first and second rotors and having a front minor diameter section and a rear major diameter section.

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 first rotor, a second rotor, a fitting hole, a tier control member, an accommodation hole, a first release hydraulic pressure chamber and a second release hydraulic pressure chamber. The first rotor rotates in synchronization with a crankshaft of an internal combustion engine and has a plurality of shoes, which are projected inwardly to define a plurality of hydraulic pressure chambers. The second rotor is fixed at an end of a camshaft of the internal combustion engine and has a plurality of vanes which partition the plural hydraulic pressure chambers of the first rotor into an advance side hydraulic pressure chamber and a retardation side hydraulic pressure chamber. The fitting hole is disposed at any one of the first rotor or the second rotor. The tier control member fits in the fitting hole to control a relative rotation of the first and second rotors and having a front minor diameter section and a rear major diameter section.

Abstract: A valve timing control device has an input rotational member 3, a case 4, and a cover member 10, which constitute a housing 2. A threaded member 11 such as a bolt is used for being integrated with the cover member 10, the case 4 and the input rotational member 3. A welding section 20 is formed at the bolt 11 to prevent the loosening and detachment of the bolt 11.

Abstract: A valve timing adjusting apparatus of an internal combustion engine in which number of lock pins is decreased is provided.

Abstract: A valve timing control device has an input rotational member 3, a case 4, and a cover member 10, which constitute a housing 2. A threaded member 11 such as a bolt is used for being integrated with the cover member 10, the case 4 and the input rotational member 3. A welding section 20 is formed at the bolt 11 to prevent the loosening and detachment of the bolt 11.

Abstract: A plate spring is pre-assembled as a unit into a seal member which contains the section between an advancing oil pressure chamber and a retarding oil pressure chamber in a valve timing regulation device. Both the seal member and the plate spring are adapted to be inserted integrally between the sliding faces of the first rotating body and the second rotating body of the valve timing regulation device. Furthermore it is possible to facilitate the insertion of these components. The detachment of the plate spring 32 which is fitted into the indented inner section of the seal member 27 is suppressed and a spring detachment prevention means 31a, 31b which allows displacement due to resilient deformation of the plate spring 32 is provided in the seal member 27.

Abstract: A valve timing control device includes a purge path communicating between a hydraulic chamber allowing the entry of hydraulic pressure on starting an engine and a backward pressurized section in an accommodation hole. When the hydraulic chamber allowing the entry of hydraulic pressure on starting the engine is the retardation side hydraulic chamber, a hydraulic pressure derived from an oil pump is supplied to the retardation side hydraulic chamber on starting the engine. On the way, air-mixed oil is discharged to outside of the device by way of a purge path, a backward pressurized section in the accommodation hole and the discharge hole. When the air is discharged, a residual pressure is produced in the backward pressurized section due to oil supplied thereto. The residual pressure results in the increase of an unlocking hydraulic pressure to prevent a locking member from being unlocked.

Abstract: A seal member of a seal unit of a valve timing adjusting device has foot portions and protrusive guides protruding from a seal reverse plane along internal surfaces of the foot portions. A plate spring of the seal unit has foot portions and fork portions arranged on top ends of the foot portions. A slit is formed in each fork portion to allow the insertion of the protrusive guide when the plate spring is fitted to the seal member. The positional relationship between the slit and the protrusive guide is determined on condition that the plate spring fitted to the seal member does not detach from the seal member and the plate spring doe not collide with the protrusive guide when the plate spring is bent to arrange the seal unit in the valve timing adjusting device. When the plate spring is fitted to the seal member, the slits of the fork portions are positioned just above the protrusive guides, and the plate spring is dropped according to the gravitational force.

Abstract: A valve timing control device has a case rotating in synchronization with a crankshaft of an engine. A plurality of projections, which project outwardly in a radial direction of the case, are arranged on an outer circumferential portion of the case at regular intervals. The projection is a chuck site allowing the engagement of a chuck tool of an automatic machine used for an auto-assembly work, the chuck tool being operated in the radial direction. A tapered face is formed at a side, close to the chuck tool, of the projection, the tapered face easily allowing the engagement of the chuck tool when the chuck tool proceeds toward the device.

Abstract: A valve timing control device has a hydraulic pressure supply passage for supplying a hydraulic pressure used for releasing lock due to the lock member. If a hydraulic pressure applied to the hydraulic pressure supply passage reaches a required pressure, a hydraulic pressure subjected to a major diameter section of the lock member is larger than the sum total of the biasing force of two biasing members. Thus, the lock member is returned in a direction of releasing the lock due to the lock member. The sliding member is moved backward while the lock member is also moved backward. The stroke of the sliding member is extremely shorter than that of the lock pin. With a locked state of leaving the engagement of a minor diameter section of the lock member with an engagement hole, a rear end face of a minor diameter section of the sliding member abuts with a rear wall face 16c of a backward pressure chamber.