Patent application number | Description | Published |
20090071424 | VALVE TIMING CONTROL APPARATUS - A boss portion of a vane rotor includes a tapered outer wall surface, which is tilted relative to an axis of the boss portion. A housing member includes a tapered inner wall surface that contacts the tapered outer wall surface. A seal member is provided at one axial end surface of the vane rotor on one axial side of the vane rotor, toward which the vane rotor urges the housing member by an interaction between the tapered outer wall surface of the supporting portion and the tapered inner wall surface of the housing member. | 03-19-2009 |
20090078222 | VALVE TIMING CONTROL APPARATUS - A check valve is provided in a fluid passage between a phase change valve and a fluid supply source. The check valve enables a flow of the hydraulic fluid from the fluid supply source to a retarding chamber or an advancing chamber defined in a housing in corporation with a vane rotor received therein. The check valve blocks a flow of the hydraulic fluid from the retarding chamber or the advancing chamber to a fluid supply source side. A filter is provided in the fluid passage between the check valve and the fluid supply source to remove debris from the hydraulic fluid before supplying of the hydraulic fluid to the check valve. | 03-26-2009 |
20090133651 | VALVE TIMING CONTROL APPARATUS - An advancing check valve is placed in an advancing connection passage of a spool to enable a flow of hydraulic fluid in a first direction from a retarding port side toward an advancing port side upon placement of the spool in an advancing position and to limit a flow of hydraulic fluid in a second direction from the advancing port side toward the retarding port side upon placement of the spool in the advancing position. A retarding check valve is placed in a retarding connection passage of the spool to enable a flow of hydraulic fluid in the second direction upon placement of the spool in a retarding position and to limit a flow of hydraulic fluid in the first direction upon placement of the spool in the retarding position. | 05-28-2009 |
20090178635 | VALVE TIMING ADJUSTER - A valve timing adjuster includes a first rotor, a second rotor, a spool valve, a connection passage, and a connection check valve. A spool of the spool valve is displaceable to a first position such that the first rotor is rotated relative to the second rotor. The spool is displaceable to a second position to hold the phase of a camshaft at a full phase. The connection passage connects a first output port with a second output port of the spool valve when the spool is positioned at the first position. The connection check valve of the connection passage allows working fluid to flow from the second output port toward the first output port. | 07-16-2009 |
20100175651 | VALVE TIMING CONTROLLER - When a spool is positioned in a lock range including a stroke end in a first direction, an advance port and a lock port are respectively connected to a supply port and a discharge port. When the spool is positioned in an advance range deviating from the lock range in a second direction, the advance port and the lock port are fluidly connected to the supply port. While a driving source generates a driving force to move the spool in the second direction, a biasing member biases the spool in the first direction. When the spool is positioned at a limit position of the advance range, a biasing force biasing the spool in the first direction is stepwise varied by a specified variation width. | 07-15-2010 |
20100199938 | VARIABLE VALVE TIMING APPARATUS - A variable valve timing apparatus includes a stopper piston which has an equalizing passage in an axial direction. Even if the engaging hole is filled with the oil, the equalizing passage enables the oil flows from an engaging hole to a holding hole when the stopper piston enters into the engaging hole. It is possible to form a vane as narrow as possible, and to enlarge a variable angular range. In addition, the stopper piston has both end faces which are substantially identical in surface area. Even if pulsation arises in oil pressure, pressures acting on both end faces of the stopper piston can be substantially cancelled and position of the stopper piston can be stabilized. | 08-12-2010 |
20100313835 | VALVE TIMING CONTROL APPARATUS - A vane rotor includes a vane to partition an advance chamber from a retard chamber. A valve element communicates a lock port with an exhaust port to drain a fluid from the lock port when moving in a first region including an end of a movable range in the first direction. The regulating member moves in the vane rotor in a thrust direction into a recess dented from an inner surface of the housing by being biased from a resilient member to lock the rotation phase in a regulation phase in the first region when a fluid is drained from the lock chamber. The valve element is configured to communicate an operation port with a supply port to supply a fluid into the advance chamber when being in a throttle region in the first region such that a flow of a fluid supplied to the advance chamber is throttled to be less than a flow of a fluid when the valve element is in the end of the movable range in the first direction. | 12-16-2010 |
20110088645 | VALVE TIMING ADJUSTER - A valve timing adjuster for an internal combustion engine adjusts valve timing. The valve timing adjuster includes a housing, a vane rotor, a regulation device, a fluid route, and an opening/closing control device. The regulation device regulates a rotational phase of the vane rotor relative to the housing to a regulation position located between a full advance position and a full retard position. The fluid route is communicated with a specific chamber that is at least one of an advance chamber and a retard chamber. The fluid route extends via a radially inner part to be communicated with atmosphere. The radially inner part is located radially between the specific chamber and a rotation center. The opening/closing control device opens and closes the fluid route. | 04-21-2011 |
20120186547 | VARIABLE VALVE TIMING DEVICE - A variable valve timing device includes a control valve for switching fluid communication among ports. The control valve includes a sleeve, a spool, a movable member, and resilient members. A first resilient member pushes the spool in both of the regions. A second resilient member acts on the spool via the movable member engaged with the spool in an advancing region. In a lock region, the movable member rests on the sleeve to enable the spool to move freely from the second resilient member. As a result, force acting on the spool can be restricted in the lock region. The movable member is supported from a radial inside by the spool and is radially distanced from the sleeve. As a result, it is possible to reduce a sliding resistance acting on the movable member. | 07-26-2012 |
20130000577 | VARIABLE VALVE TIMING APPARATUS - A variable valve timing apparatus includes a stopper piston which has an equalizing passage in an axial direction. Even if the engaging hole is filled with the oil, the equalizing passage enables the oil flows from an engaging hole to a holding hole when the stopper piston enters into the engaging hole. It is possible to form a vane as narrow as possible, and to enlarge a variable angular range. In addition, the stopper piston has both end faces which are substantially identical in surface area. Even if pulsation arises in oil pressure, pressures acting on both end faces of the stopper piston can be substantially cancelled and position of the stopper piston can be stabilized. | 01-03-2013 |