Oil pressure control apparatus for an internal combustion engine

• US 20040055551A1
• Filed: 09/22/2003
• Published: 03/25/2004
• Est. Priority Date: 06/10/1999
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Unisia Jecs Corporation (Hitachi, Ltd.)
• Inventors: Maeyama, Akinobu, Koda, Masanori
• Granted Patent: US 6,848,404 B2
• Time in Patent Office: Days
• US Class Current: 123/90.17
• CPC Class Codes: F01L 1/34 characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
• CPC Class Codes: F01L 1/344 changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
• CPC Class Codes: F01L 1/34406 the helically teethed sleeve being located in the camshaft driving pulley
• CPC Class Codes: F01L 2001/34426 Oil control valves
• CPC Class Codes: F01L 2001/3443 Solenoid driven oil control valves
• CPC Class Codes: F01L 2001/3444 Oil filters
• CPC Class Codes: F15B 13/0402 for linearly sliding valves, e.g. spool valves
• CPC Class Codes: Y10T 137/794 With means for separating solid material from the fluid
• CPC Class Codes: Y10T 137/7976 Plural separating elements

Abstract

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.

Claims

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,

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. The oil pressure control apparatus as claimed in claim 2, 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. The oil pressure control apparatus as claimed in claim 1, the valve body having an annular groove in a circumferencial direction of the valve body, the filter member is provided in the annular groove.

6. The oil pressure control apparatus as claimed in claim 1, 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.

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, the filter member is held under a tension by the hook.