Oil pressure control apparatus for an internal combustion engine
View Patent ↗An oil pressure control apparatus which includes a source of hydraulic pressure introducing the hydraulic pressure to a hydraulic actuator which is actuated by hydraulic pressure, a fluid passage which is connected between the source of hydraulic pressure and the hydraulic actuator for introducing and discharging hydraulic pressure from the source of hydraulic pressure to the actuator, a control valve which is disposed in the fluid passages for controlling the hydraulic pressure and a filter is disposed in a position that is between the actuator and the control valve. Thereby, the control valve is capable to be operated smoothly.
1. An oil pressure control apparatus, comprising:
a source of hydraulic pressure;
a hydraulic actuator which is actuated by hydraulic pressure;
a fluid passage which is in communication with the source of hydraulic pressure and the hydraulic actuator; and
a control valve which is disposed in the fluid passage for controlling the hydraulic pressure introduced to the actuator,
the control valve comprising:
a valve body; and
a filter member,
the filter member having a hook provided at one end of the filter member and a matching projection at a second opposite end which may be coupled together to form a substantially cylindrical body, whereby the filter member is held under a tension by the hook.
2. The oil pressure control apparatus as claimed in claim 1 , the filter member further comprising:
a filter portion; and
a frame portion provided around the filter portion, the frame portion comprises a synthetic resin.
3. An oil pressure control apparatus, comprising:
a source of hydraulic pressure;
a hydraulic actuator which is actuated by hydraulic pressure;
a fluid passage which is in communication with the source of hydraulic pressure and the hydraulic actuator; and
a control valve which is disposed in the fluid passage for controlling the hydraulic pressure introduced to the actuator,
the control valve comprising:
a valve body; and
a filter member,
the filter member having a hook provided at one end of the filter member, the filter member is held under a tension by the hook,
wherein the filter member further comprises a filter portion and a frame portion provided around the filter portion, the frame portion comprises a synthetic resin; and
wherein the engine includes a valve and a valve spring resiliently urging the valve for closing an inlet or an exhaust port, the frame portion having a pair of main frames provided on both sides of the filter in the direction along longitudinal axis of the filter member and a plurality of crosspieces provided between the frames; and
wherein the crosspieces are connecting the main frames, and one of the crosspieces comprises the hook.
4. An oil pressure control apparatus, comprising:
a source of hydraulic pressure;
a hydraulic actuator which is actuated by hydraulic pressure;
a fluid passage which is in communication with the source of hydraulic pressure and the hydraulic actuator; and
a control valve which is disposed in the fluid passage for controlling the hydraulic pressure introduced to the actuator,
the control valve comprising:
a valve body; and
a filter member,
the filter member having a hook provided at one end of the filter member, the filter member is held under a tension by the hook,
the valve body having an annular groove in a circumferential direction of the valve body, the filter member is provided in the annular groove.
5. An oil pressure control apparatus for an internal combustion engine comprising:
a source of hydraulic pressure;
a hydraulic actuator which is actuated by hydraulic pressure;
a fluid passage which is in communication with the source of hydraulic pressure and the hydraulic actuator; and
a control valve which is disposed in the fluid passage for controlling the hydraulic pressure introduced to the actuator,
the control valve comprising:
a valve body; and
a filter member,
the filter member having a hook provided at one end of the filter member hook at one end and a matching projection at a second opposite end which may be coupled together to form a substantially cylindrical body having an axis and further having cross pieces disposed axially with respect to the axis of the cylindrical body, whereby the filter member is held under a tension by the hook.
6. An oil pressure control apparatus, comprising:
a source of hydraulic pressure;
a hydraulic actuator which is actuated by hydraulic pressure;
a fluid passage which is in communication with the source of hydraulic pressure and the hydraulic actuator; and
a control valve which is disposed in the fluid passage for controlling the hydraulic pressure introduced to the actuator,
the control valve comprising:
a valve body; and
a filter member,
the filter member having a hook provided at one end of the filter member, the filter member is held under a tension by the hook,
wherein the engine includes a valve and a valve spring resiliently urging the valve for closing an inlet or an exhaust port;
wherein the hydraulic actuator comprises:
a camshaft rotatably mounted on a cylinder head for opening and closing the valve against a force of the valve spring, the camshaft being subject to an alternating torque of the valve spring;
a sprocket rotatably mounted on the camshaft and being operative to transmit a revolution of a crankshaft, the camshaft receiving a force of a crankshaft revolution;
a phase changer disposed between the camshaft and the sprocket for changing a rotational phase of the camshaft relative to the sprocket; and
a chamber defined between the camshaft and the sprocket and connected to the inlet passage; and
wherein the first filter damps the pulsing stream that is caused by the alternating torque of the valve spring.