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Variable valve timing control device

  • US 10,450,905 B2
  • Filed: 03/09/2018
  • Issued: 10/22/2019
  • Est. Priority Date: 03/23/2017
  • Status: Active Grant
First Claim
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1. A variable valve timing control device, comprising:

  • a drive-side rotational body rotating synchronously with a crankshaft of an internal combustion engine;

    a driven-side rotational body being coaxially disposed with a rotary axis of the drive-side rotational body, and rotating integrally with a camshaft for opening and closing a valve;

    an advanced-angle chamber being formed between the drive-side rotational body and the driven-side rotational body;

    a retarded-angle chamber being formed between the drive-side rotational body and the driven-side rotational body;

    a lock mechanism including a recessed portion being formed at one of the drive-side rotational body and the driven-side rotational body, and a lock member being formed at the other of the drive-side rotational body and the driven-side rotational body, the lock member being selectively engageable with the recessed portion; and

    a valve unit including a connecting bolt which is coaxially disposed with the rotary axis, and which connects the driven-side rotational body to the camshaft;

    whereinthe connecting bolt is formed withan advanced-angle port communicating with the advanced-angle chamber;

    a retarded-angle port communicating with the retarded-angle chamber;

    at least one lock port communicating with the recessed portion;

    a first pump port supplying a fluid from outside to the advanced-angle port and the retarded-angle port; and

    a second pump port supplying the fluid from outside to the lock port;

    the advanced-angle port, the retarded-angle port, the lock port, the first pump port, and the second pump port are formed as through holes each of which connects an inner space and an outer circumferential surface of the connecting bolt;

    the lock port is formed at a same position as a position of the second pump port in the direction along the rotary axis, and is disposed different from the second pump port in a circumferential direction;

    the valve unit includes a spool having a plurality of land portions at an outer circumference of the spool, and being formed with a drain flow path inside the spool, the valve unit housing the spool which is movable in the direction along the rotary axis relative to the inner space of the connecting bolt; and

    the valve unit allows the second pump port and the lock port to communicate with each other in a case where the spool is set at an unlock position where a lock state of the lock mechanism is released, and the valve unit closes the second pump port with the land portion of the spool and allows the lock port to communicate with the drain flow path in a case where the spool is set at a lock position where the lock mechanism is allowed to be shifted in the lock state.

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