Valve timing adjusting apparatus
First Claim
1. A valve timing adjusting apparatus disposed between a drive shaft of an internal combustion engine and a driven shaft causing an opening and closing operation of at least one of an intake valve and an exhaust valve and operative to change an angular phase of the driven shaft relative to the drive shaft so that opening and closing timing of the at least one of an intake valve and an exhaust valve may be varied, comprising:
- a drive side rotating member rotatable together with the drive shaft;
a driven side rotating member rotatable together with the driven shaft, a rotation control pressure chamber operative to rotate the driven side rotating member relative to the drive side rotating member so that angular phase of the driven side rotating member relative to the drive side rotating member is controlled to a target position between the most retard angle position and the most advanced angle position in response to hydraulic pressure applied thereto;
a lock piston provided in one of the driven and drive side rotating members;
a fitting hole provided in the other of the driven and drive side rotating members; and
an angular phase locking pressure chamber operative to execute one of first and second operations when hydraulic pressure is applied thereto and the other of the first and second operations when application of the hydraulic pressure thereto is released, the first operation being to insert the lock piston into the fitting hole so as to lock the angular phase of the driven side rotating member relative to the drive side rotating member to a middle position between the most retard angle position and the most advanced angle position, and the second operation being to pull the lock piston out of the fitting hole so as to release lock of the angular phase of the driven side rotating member relative to the drive side rotating member at the middle position, wherein a supply route of the hydraulic pressure to the rotation control pressure chamber is different from that to the angular phase locking pressure chamber and, when at least one of the first and second operations is executed, start timing of rotation of the driven side rotating member relative to the drive side rotating member so as to change the angular phase of the driven side rotating member relative to the drive side rotating member to the target position is retard by a given delay time from start timing of execution of the at least one of the first and second operations.
1 Assignment
0 Petitions
Accused Products
Abstract
In a valve timing adjusting apparatus, rotating response speed of a vane rotor and a moving speed of a lock piston are changed according to changes of oil temperature and pressure. It sometimes happens that the lock piston passes the fitting hole before the lock piston is fitted in the fitting hole. Timing of actuating a solenoid valve is retard by a given delay time from timing of actuating a spool valve. The given delay time is decided by a map based on sensor signals representing the oil temperature and pressure input to ECU. The given delay time is shorter as the oil temperature increases and longer as the oil pressure increases.
29 Citations
18 Claims
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1. A valve timing adjusting apparatus disposed between a drive shaft of an internal combustion engine and a driven shaft causing an opening and closing operation of at least one of an intake valve and an exhaust valve and operative to change an angular phase of the driven shaft relative to the drive shaft so that opening and closing timing of the at least one of an intake valve and an exhaust valve may be varied, comprising:
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a drive side rotating member rotatable together with the drive shaft;
a driven side rotating member rotatable together with the driven shaft, a rotation control pressure chamber operative to rotate the driven side rotating member relative to the drive side rotating member so that angular phase of the driven side rotating member relative to the drive side rotating member is controlled to a target position between the most retard angle position and the most advanced angle position in response to hydraulic pressure applied thereto;
a lock piston provided in one of the driven and drive side rotating members;
a fitting hole provided in the other of the driven and drive side rotating members; and
an angular phase locking pressure chamber operative to execute one of first and second operations when hydraulic pressure is applied thereto and the other of the first and second operations when application of the hydraulic pressure thereto is released, the first operation being to insert the lock piston into the fitting hole so as to lock the angular phase of the driven side rotating member relative to the drive side rotating member to a middle position between the most retard angle position and the most advanced angle position, and the second operation being to pull the lock piston out of the fitting hole so as to release lock of the angular phase of the driven side rotating member relative to the drive side rotating member at the middle position, wherein a supply route of the hydraulic pressure to the rotation control pressure chamber is different from that to the angular phase locking pressure chamber and, when at least one of the first and second operations is executed, start timing of rotation of the driven side rotating member relative to the drive side rotating member so as to change the angular phase of the driven side rotating member relative to the drive side rotating member to the target position is retard by a given delay time from start timing of execution of the at least one of the first and second operations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
a restriction piston provided in one of the driven and drive side rotating members;
a restriction hole formed in shape of an arc extending within a given angular range and provided in the other of the driven and drive side rotating members; and
an angular phase restriction pressure chamber operative to execute one of third and fourth operations when hydraulic pressure is applied thereto and the other of the third and fourth operations when application of the hydraulic pressure thereto is released, the third operation being to insert the restriction piston into the restriction hole so as to restrict rotation of the driven side rotating member relative to the drive side rotating member within the given angular range and the fourth operation being to pull the restriction piston out of the restriction hole so as to release restriction of rotation of the driven side rotating member relative to the drive side rotating member within the given angular range, wherein a supply route of the hydraulic pressure to the angular phase restriction pressure chamber is same as that to the angular phase locking pressure chamber, an end of the given angular range is at a position corresponding to the middle position between the most retard angle position and the most advanced angle position and the other end of the given angular range is at a position away from the middle position toward the most advanced angle position and, when the third operation is executed together with the first operation, the restriction piston abuts on the end of the given angular range within the restriction hole.
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8. A valve timing adjusting apparatus according to claim 1, further comprising:
a mechanical pump rotatable together with the engine for supplying the hydraulic pressure via the supply routes to the rotation control pressure chamber and the angular phase locking pressure chamber.
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9. A valve timing adjusting apparatus according to claim 1, wherein one of the driven and drive side rotating members is a housing having an accommodation chamber and the other of the driven and drive side rotating members is a vane rotatable within a defined angular range in the housing and having a partition with which the accommodation chamber is separated into two rooms one of which is a retard angle pressure chamber and the other of which is an advanced angle pressure chamber, whereby the vane is rotated relatively to the housing by controlling the hydraulic pressures applied to the respective retard and advanced angle pressure chambers.
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10. A valve timing adjusting apparatus disposed between a drive shaft of an internal combustion engine and a driven shaft causing an opening and closing operation of at least one of an intake valve and an exhaust valve and operative to change an angular phase of the driven shaft relative to the drive shaft so that opening and closing timing of the at least one of an intake valve and an exhaust valve may be varied, comprising:
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a drive side rotating member rotatable together with the drive shaft;
a driven side rotating member rotatable together with the driven shaft, a rotation control pressure chamber operative to rotate the driven side rotating member relative to the drive side rotating member so that angular phase of the driven side rotating member relative to the drive side rotating member is controlled to a target position between the most retard angle position and the most advanced angle position in response to hydraulic pressure applied thereto;
a restriction piston provided in one of the driven and drive side rotating members;
a restriction hole formed in shape of an arc extending within a given angular range and provided in the other of the driven and drive side rotating members, an end of the restriction hole constituting a retard angle side end and the other end thereof constituting an advance angle side end; and
an angular phase restriction pressure chamber operative to execute one of first and second operations when hydraulic pressure is applied thereto and the other of the first and second operations when application of the hydraulic pressure thereto is released, the first operation being to insert the restriction piston into the restriction hole so as to restrict rotation of the driven side rotating member relative to the drive side rotating member within the given angular range and the second operation being to pull the restriction piston out of the restriction hole so as to release restriction of rotation of the driven side rotating member relative to the drive side rotating member within the given angular range, wherein a supply route of the hydraulic pressure to the rotation control pressure chamber is different from that to the angular phase restriction pressure chamber and, when at least one of the first and second operations is executed, start timing of rotation of the driven side rotating member relative to the drive side rotating member so as to change the angular phase of the driven side rotating member relative to the drive side rotating member to the target position is retard by a given delay time from start timing of execution of the at least one of the first and second operations. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
a lock piston provided in one of the driven and drive side rotating members;
a fitting hole provided in the other of the driven and drive side rotating members; and
an angular phase locking pressure chamber operative to execute one of third and fourth operations when hydraulic pressure is applied thereto and the other of the third and fourth operations when application of the hydraulic pressure thereto is released, the third operation being to insert the lock piston into the fitting hole so as to lock the angular phase of the driven side rotating member relative to the drive side rotating member to a given position within the given angular range of the restriction hole and the fourth operation being to pull the lock piston out of the fitting hole so as to release lock of the angular phase of the driven side rotating member relative to the drive side rotating member at the given position, wherein a supply route of the hydraulic pressure to the angular phase locking pressure chamber is same as that to the rotation control pressure chamber.
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17. A valve timing adjusting apparatus according to claim 10, further comprising:
a mechanical pump rotatable together with the engine for supplying the hydraulic pressure via the supply routes to the rotation control pressure chamber and the angular phase restriction pressure chamber.
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18. A valve timing adjusting apparatus according to claim 10, wherein one of the driven and drive side rotating members is a housing having an accommodation chamber and the other of the driven and drive side rotating members is a vane rotatable within a defined angular range in the housing and having a partition with which the accommodation chamber is separated into two rooms one of which is a retard angle pressure chamber and the other of which is an advanced angle pressure chamber, whereby the vane is rotated relatively to the housing by controlling the hydraulic pressures applied to the respective retard and advanced angle pressure chambers.
Specification