JP2004150444A - Valve timing change device of internal combustion engine and its control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic system capable of reducing pulsation of a hydraulic oil acting on a control valve based on reverse torque of a camshaft. <P>SOLUTION: A valve timing change device is an actuator 2 actuated by the hydraulic oil supplied from an oil pressure source 1. The control valve 3 for controlling supply of the hydraulic oil from the oil pressure source 1 to the actuator and discharge of the hydraulic oil from the actuator is provided between the oil pressure source 1 and the valve timing change device. Filters 38, 39 are provided on a control valve opening part between the actuator and the control valve. Since the hydraulic oil is introduced to the control valve opening part, pulsation of the hydraulic oil generated from the reverse torque acting on the camshaft is reduced. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to a hydraulic device provided with various actuators, such as a valve timing changing device for changing the opening / closing timing of an intake valve or an exhaust valve during operation of an internal combustion engine.

  This type of hydraulic device is provided with a hydraulic source, an actuator that is operated by hydraulic oil supplied from the hydraulic source, and a hydraulic oil source and an actuator that are disposed between the hydraulic source and the actuator. And a control valve for controlling discharge of hydraulic oil from the engine.

Further, the hydraulic device is provided with a filter for filtering the hydraulic oil in order to prevent a foreign substance from being mixed in the hydraulic oil and causing an operation failure of the control valve or the like beforehand. It is provided only in the passage from the hydraulic source to the control valve.
JP-A-8-14015

  However, in the conventional example, since the filter is provided only in the passage leading from the hydraulic source to the control valve, the hydraulic oil from the hydraulic source can be filtered, but the hydraulic oil circulated through the actuator is filtered. Can not do it. For this reason, there is a possibility that foreign matter generated inside the actuator for some reason may enter the control valve and cause malfunction of the control valve.

  The present invention has been devised in view of the conventional circumstances described above, and has as its object to provide a hydraulic device capable of advantageously preventing a control valve from malfunctioning due to foreign matter in hydraulic oil. .

  In view of the above, the invention according to claim 1 is particularly advantageous in that the hydraulic oil generated from the reversal torque acting on the camshaft by guiding the hydraulic oil to the control valve opening between the valve timing changing device and the control valve. It is characterized by attenuating pulse pressure.

  The invention according to claim 2 is characterized in that a filter is provided at the opening of the control valve, and the hydraulic oil is guided to the filter to attenuate the pulse pressure of the hydraulic oil generated from the reversal torque acting on the camshaft. And

  The invention according to claim 3 relates to a control valve of a valve timing changing device, wherein the control valve is generated by a reversing torque acting on the camshaft by guiding hydraulic oil to an opening of a valve body communicating with an actuator. It is characterized by attenuating the pulse pressure of hydraulic oil.

  According to a fourth aspect of the present invention, a filter is provided at the opening of the valve body, and the hydraulic oil is guided to the filter to attenuate the pulse pressure of the hydraulic oil generated from the reverse torque acting on the camshaft. Features.

  The invention according to claim 5 relates to a valve timing changing device, which supplies hydraulic fluid from the control valve to the actuator, the control valve, and the actuator, or supplies hydraulic fluid from the actuator to the control valve. A first and second supply / discharge passage for discharging is provided, and the rotation of the camshaft based on the rotation of the internal combustion engine is controlled in the advance direction by supplying hydraulic oil through the first supply / discharge passage. The rotation of the camshaft based on the rotation of the internal combustion engine is controlled in a retard direction by supplying hydraulic oil through the second supply / discharge passage, and the actuator includes: A sprocket that rotates in synchronization with the engine speed, and a camshaft that rotates the rotation of the sprocket with a phase controlled by hydraulic oil in the first and second supply and discharge passages. The control valve comprises a valve body, a spool valve provided in the valve body, and hydraulic fluid in the first and second supply / discharge passages with respect to rotation of the sprocket. And a mechanism for transmitting rotation controlled in phase by the camshaft to the camshaft.The control valve includes an electromagnetic solenoid for applying a force to the spool valve in a longitudinal direction thereof, and a force for the electromagnetic solenoid. A spring member added to the spool valve; and a means for reducing pulsation pressure in the first and second supply / discharge passages. It is characterized by being attenuated.

  In such a configuration, the supply of hydraulic oil from the hydraulic pressure source to the valve timing changing device and the discharge of hydraulic oil from the valve timing changing device are controlled by controlling the control valve by a control device or the like. Specifically, for example, when the spool valve is driven, the spool valve controls the opening and closing of the opening of the valve body, and controls the flow rate of the hydraulic oil passing through each opening.

  As a result, the hydraulic oil guided to the valve timing changing device via the control valve is controlled, and the operation of the valve timing changing device is controlled.

  Here, the hydraulic oil discharged from the valve timing changing device via the control valve is filtered by a filter provided between the valve timing changing device and the control valve.

  As a result, foreign matter mixed in the hydraulic oil due to abrasion of the valve timing changing device or the like is removed by the filter and is prevented from entering the control valve.

  Therefore, only clean working oil is introduced into the control valve, so that the control valve operates smoothly.

  Therefore, it is possible to obtain a hydraulic device capable of advantageously preventing the malfunction of the control valve from being caused by the foreign matter in the hydraulic oil.

  In addition, since a filter is provided between the valve timing changing device and the control valve, the filter filters the operating oil and minimizes a change in the rotation phase due to the reversal torque acting on the camshaft. Can be.

  That is, the valve timing changing device generates a pulse pressure in the inside thereof due to the reversal torque acting on the camshaft, and there is a possibility that the pulse pressure of the hydraulic oil acts on the control valve and leaks from the control valve. When hydraulic oil leaks from the control valve, the rotational phase of the camshaft is unexpectedly changed.However, in the present invention, when the pulse pressure of the hydraulic oil tries to act on the control valve, the filter Acts as a resistance to attenuate the pulsation of the hydraulic oil. Therefore, the effect of the reversing torque acting on the camshaft can be reduced.

  According to the fourth aspect of the present invention, since the filter is provided in the opening of the valve body, the mounting becomes easier and the valve timing is improved as compared with the case where the filter is provided in the middle of the hydraulic passage. Hydraulic oil over the entire range of the hydraulic passage between the change device and the control valve is filtered and filtered.

  As described above, according to the present invention, it is possible to obtain a hydraulic device capable of advantageously preventing a control valve from malfunctioning due to foreign matter in hydraulic oil.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory view of a hydraulic device showing an embodiment of the present invention, and FIG. 2 is a sectional view of the control valve shown in FIG.

  In the figure, reference numeral 1 denotes a hydraulic source, and 2 denotes an actuator operated by hydraulic oil supplied from the hydraulic source 1. Reference numeral 3 denotes a control valve disposed between the hydraulic pressure source 1 and the actuator 2. The control valve 3 controls the supply of hydraulic oil from the hydraulic pressure source 1 to the actuator 2 and the discharge of hydraulic oil from the actuator 2. It has become.

  The hydraulic power source 1 is configured with a hydraulic pump as a main element, and the hydraulic power source 1 and the control valve 3 communicate with each other through a supply passage 4.

  The actuator 2 is a valve timing changing device for an internal combustion engine. The valve timing changing device is provided between a sprocket 5 that rotates in synchronization with the rotation of the internal combustion engine and a cam shaft 6 that drives an intake valve or an exhaust valve (not shown). On the other hand, the camshaft 6 is relatively rotated to change the opening / closing timing of the intake valve or the exhaust valve. That is, the sprocket 5 is connected to and driven by a crankshaft (not shown) via a timing chain 7 wound around the outer periphery, and the camshaft 6 is driven by a cam (not shown) formed on the camshaft 6. The intake valve or the exhaust valve is driven to open and close. The actuator 2 and the control valve 3 communicate with each other by suction and discharge passages 8 and 9.

  The control valve 3 includes a cylindrical valve body 10 and a spool valve 11 slidably housed in the cylindrical body of the valve body 10.

  The valve body 10 has an opening 12 communicating with the hydraulic pressure source 1 and openings 13 and 14 communicating with the actuator 2. That is, the opening 12 communicates with the hydraulic power source 1 via the supply passage 4, the opening 13 communicates with the actuator 2 via the suction / discharge passage 8, and the opening 14 via the suction / discharge passage 9. To communicate with the actuator 2. An opening 15 is formed in the valve body 10, and the opening 15 communicates with an oil storage tank 17 via a drain passage 16. The openings 12, 13, 14, and 15 are open toward the circumferential grooves 22, 23, 24, and 25 formed on the outer periphery of the body of the valve body 10.

  The spool valve 11 is urged toward the electromagnetic solenoid 29 by a spring member 28 provided in the valve body 10, and is driven by the electromagnetic solenoid 29 to be slidable in the valve body 10. By sliding inside the valve body 10, the spool valve 11 can open and close the openings 12, 13, 14, 15 formed in the valve body 10 with its land portions 30, 31.

  One end of the spring member 28 is supported by a spring receiver 32, and the spring receiver 32 is prevented from coming off by a retaining ring 33. A connection terminal 34 is provided at a connection end of the electromagnetic solenoid 29, and is connected to a control device and a power source (not shown).

  A filter 37 is provided between the hydraulic pressure source 1 and the control valve 3, and filters 38 and 39 are provided between the actuator 2 and the control valve 3. Specifically, the filter 37 is provided in the supply passage 4 between the hydraulic pressure source 1 and the control valve 3, and the filter 38 is provided in the suction and discharge passage 8 between the actuator 2 and the control valve 3. The filter 39 is provided in the suction / discharge passage 9 between the actuator 2 and the control valve 3.

  Next, the operation of the valve timing changing device having such a configuration will be described.

  First, when no control current is supplied to the electromagnetic solenoid 29 from a control device and a power source (not shown) (not shown), the spool valve 11 is urged leftward in FIG. 1 by the spring force of the spring member 28. The spool valve 28 is stopped at a predetermined position (see FIG. 1).

  In the non-energized state, the land 30 of the spool valve 11 opens the opening 13 of the valve body 10 on the opening 12 side by a predetermined area, and the land 31 opens the opening 14 by the predetermined area on the opening 15 side. ing. Therefore, the hydraulic oil guided from the hydraulic pressure source 1 into the valve body 10 via the supply passage 4 and the opening 12 is guided to the actuator 2 via the opening 13 and the suction / discharge passage 8. On the other hand, the suction / discharge passage 9 communicates with the oil storage tank 17 via the opening 14, the opening 15 and the drain passage 16.

  As a result, the actuator 2 performs a predetermined operation, and, for example, the camshaft 6 is controlled in the advance direction with respect to the sprocket 5.

  Next, when a control current is supplied to the electromagnetic solenoid 29 (energized state), the spool valve 11 is driven.

  The spool valve 11 is driven by the electromagnetic solenoid 29, and the spool valve 11 moves rightward in FIG. 1 so that the land 30 of the spool valve 11 moves the opening 13 of the valve body 10 to a predetermined position on the opening 15 side. In addition to the opening, the land 31 opens the opening 14 by a predetermined area on the opening 12 side. Therefore, the hydraulic oil guided from the hydraulic pressure source 1 into the valve body 10 via the supply passage 4 and the opening 12 is guided to the actuator 2 via the opening 14 and the suction / discharge passage 9. On the other hand, the suction / discharge passage 8 communicates with the oil storage tank 17 via the opening 13, the opening 15 and the drain passage 16.

  Thereby, the actuator 2 performs a predetermined operation, and, for example, the camshaft 6 is controlled in the retard direction with respect to the sprocket 5.

  Here, the hydraulic oil guided from the hydraulic pressure source 1 to the actuator 2 via the control valve 3 is filtered by a filter 37 provided between the hydraulic pressure source 1 and the control valve 3, and the hydraulic fluid is guided by the actuator 2 and the control valve 3. 3 is filtered by the filter 38 or the filter 39 provided between the filter 3 and the filter 3. The hydraulic oil discharged from the actuator 2 via the control valve 3 is filtered by a filter 38 or a filter 39 provided between the actuator 2 and the control valve 3. That is, the hydraulic oil flowing from the hydraulic pressure source 1 to the control valve 3 is filtered by the filter 37, and the hydraulic oil flowing from the actuator 2 to the control valve 3 is filtered by the filters 38 and 39.

  As a result, foreign matter that has entered the hydraulic oil due to wear of the actuator 2 or the like is removed by the filter 38 or the filter 39 and is prevented from entering the control valve 3.

  For this reason, only clean working oil is introduced into the control valve 3, so that the control valve 3 operates smoothly.

  Therefore, it is possible to obtain a hydraulic device that can advantageously prevent a malfunction of the control valve 3 from being caused by a foreign matter in the hydraulic oil.

  Further, since the actuator 2 is a valve timing changing device, and the filters 38 and 39 are provided between the valve timing changing device and the control valve 3, the hydraulic oil is filtered by the filters 38 and 39. In addition, the change in the rotation phase due to the reversal torque acting on the camshaft 6 can be reduced as much as possible. That is, the valve timing changing device generates a pulse pressure inside thereof due to the reversal torque acting on the camshaft 6, and the pulse pressure of the hydraulic oil may act on the control valve 3 and leak from the control valve. When hydraulic oil leaks from the control valve 3, the rotational phase of the camshaft 6 is unexpectedly changed. In the present invention, however, the pulse pressure of the hydraulic oil tends to act on the control valve 3. At this time, the filters 38 and 39 act as resistors to attenuate the pulsation of the hydraulic oil. For this reason, the influence of the reversing torque acting on the camshaft 6 can be reduced.

  3 to 6 show another embodiment of the present invention. This embodiment is different from the above embodiment in that filters 38 and 39 provided between the actuator 2 and the control valve 3 are provided. , Are provided in the openings 13 and 14 of the valve body 10, respectively. Hereinafter, this embodiment will be described in detail.

  In the description, the same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof will not be repeated.

  That is, the filter 38 is provided in the opening 13 of the valve body 10, and the filter 39 is provided in the opening 14.

  Each of the filters 38 and 39 includes a filter 41 and a frame 42 provided on the outer peripheral side of the filter 41, and is formed in a substantially C shape in a free state. The filter body 41 is formed in a mesh shape from a metal wire, and the frame body 42 is formed from a synthetic resin material.

  Each of the filters 38 and 39 has a hook portion 43 at one end and a hook engaging portion 44 at the other end. Also, a plurality of axial bar members 45 are formed so as to have a projecting shape on the inner peripheral side of the substantially C-shape, and one of the bar members 45 is formed at the end, and the hook locking portion is formed. 44 (see FIG. 5).

  Each of the filters 38 and 39 is adapted to be mounted on the valve body 10, more specifically, in the circumferential grooves 23 and 24 of the valve body 10. By locking the hook portion 43 to the main body, the whole is substantially annular. Each of the filters 38 and 39 is correctly positioned in the axial direction of the valve body 10 by being mounted in the circumferential grooves 23 and 24 of the valve body 10, and is correctly positioned with respect to the openings 13 and 14 of the valve body 10. Is done.

  Further, since each of the filters 38 and 39 is formed in a substantially C-shape in a free state, when the hook portion 43 is engaged with the hook engaging portion 44 to form a substantially annular shape, The pulling force acts on the hook 43 and the hook locking portion 44, and a strong locking is achieved.

  Also in such a configuration, the working oil directed to the control valve 3 is filtered by the filters 37, 37, and 38, so that only clean working oil is introduced into the control valve 3. Will work smoothly.

  Therefore, it is possible to advantageously prevent the malfunction of the control valve 3 from being caused by the foreign matter in the working oil.

  In addition, since the filters 38 and 39 are provided in the openings 13 and 14 of the valve body 10, respectively, the filters 38 and 39 can be mounted more easily than when the filters 38 and 39 are provided in the suction and discharge passages 8 and 9, respectively. In addition, the hydraulic oil over the entire range of the suction and discharge passages 8 and 9 between the actuator 2 and the control valve 3 is filtered and filtered.

  Further, since each of the filters 38 and 39 is attached to the valve body 10 by engaging the hook portion 43 with the hook engaging portion 44, the filter 38 and 39 can be easily attached to the valve body 10.

  Further, since each of the filters 38 and 39 is formed of the filter body 41 and the frame body 42 provided on the outer peripheral side of the filter body 41, the handling is easy and the attachment is easy. .

  7 and 8 show another embodiment of the present invention. This embodiment is different from the above embodiment in that a filter 37 provided between the hydraulic pressure source 1 and a control valve and an actuator are provided. Filters 38 and 39 provided between the control valve 2 and the control valve 3 are provided in the openings 12, 13, and 14 of the valve body 10, respectively. Hereinafter, this embodiment will be described in detail. In the description, the same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof will not be repeated.

  That is, the filter 37 is provided in the opening 12 of the valve body 10, the filter 38 is also provided in the opening 13, and the filter 39 is also provided in the opening 14.

  The filter 37 has the same configuration as the filters 38 and 39 described in the above embodiment. That is, the filters 37, 38, and 39 are used as common components.

  With such a configuration, the same operation and effect as those of the above embodiment can be obtained.

  Although the embodiments have been described with reference to the drawings, the specific configuration is not limited to the embodiments and can be changed without departing from the spirit of the invention.

It is an explanatory view of a hydraulic device showing an embodiment of the present invention. It is sectional drawing of the control valve shown in FIG. It is explanatory drawing of the hydraulic apparatus which shows another embodiment of this invention. FIG. 4 is a sectional view of the control valve shown in FIG. 3. Fig. 4 is a drawing showing a free state of the filter shown in Fig. 3 in a front view (a) and an enlarged view (b) in the direction of arrow B in the front view (a). FIG. 4 is a drawing showing a mounting state of the filter shown in FIG. 3 by a front view (a) and an enlarged view (b) of a B portion of the front view (a). It is explanatory drawing of the hydraulic apparatus which shows another embodiment of this invention. It is sectional drawing of the control valve shown in FIG.

Explanation of reference numerals

1: Hydraulic power source 2: Actuator (valve timing changing device)
3 Control valve 10 Valve body 11 Spool valve 12, 13, 14 Opening 37, 38, 39 Filter

Claims (5)

Provided between a sprocket that rotates in synchronization with the rotation of the internal combustion engine and a cam shaft that drives an intake valve or an exhaust valve by a cam, and controls the supply and discharge of hydraulic oil from a hydraulic pump by a control valve. In the valve timing changing apparatus for an internal combustion engine, the camshaft is relatively rotated with respect to the sprocket to change the opening / closing timing of the intake valve or the exhaust valve.
An internal combustion engine configured to attenuate a pulse pressure of hydraulic oil generated from a reversal torque acting on the camshaft by guiding hydraulic oil to a control valve opening between the valve timing changing device and the control valve. Valve timing change device. 2. The internal combustion engine according to claim 1, wherein a filter is provided in the control valve opening, and the hydraulic oil is guided to the filter to attenuate a pulse pressure of the hydraulic oil generated from a reversal torque acting on the camshaft. 3. Engine valve timing changer. An opening communicating with a hydraulic pressure source and an opening communicating with an actuator for changing the opening / closing timing of an intake valve or an exhaust valve driven by a cam provided on a camshaft by supplied hydraulic oil, and an opening communicating with a drain passage. A control valve of a valve timing changing device for an internal combustion engine, comprising: a cylindrical valve body having: and a spool valve slidably housed in the valve body and capable of opening and closing an opening of the valve body.
A valve timing changing device for an internal combustion engine, characterized in that the hydraulic oil is guided to an opening of the valve body communicating with the actuator, thereby attenuating a pulse pressure of the hydraulic oil generated from a reversal torque acting on the camshaft. Control valve. 4. The filter according to claim 3, wherein a filter is provided at an opening of the valve body, and a hydraulic oil guided to the filter attenuates a pulse pressure of the hydraulic oil generated from a reverse torque acting on the camshaft. A control valve for a valve timing changing device of an internal combustion engine. A valve timing change device for an internal combustion engine that rotationally drives a camshaft that opens and closes an intake valve or an exhaust valve by a cam while controlling a rotation phase based on the rotation of the internal combustion engine,
The valve timing changing device includes an actuator, a control valve, and first and second supply / discharge passages for supplying hydraulic oil from the control valve to the actuator or discharging hydraulic oil from the actuator to the control valve. Has,
By supplying hydraulic oil through the first supply / discharge passage, rotation of the camshaft based on rotation of the internal combustion engine is controlled in an advanced direction, and hydraulic oil is supplied through the second supply / discharge passage. By supplying the rotation of the camshaft based on the rotation of the internal combustion engine is configured to be controlled in the retard direction,
A mechanism for transmitting to the camshaft a sprocket that rotates in synchronization with an engine speed, and rotation of which phase is controlled by hydraulic oil in the first and second supply and discharge passages with respect to the rotation of the sprocket. And having
The control valve includes a valve body, a spool valve provided in the valve body, and a cam that rotates the phase of the rotation of the sprocket by hydraulic fluid in the first and second supply / discharge passages. And a mechanism for transmitting to the shaft,
The control valve has an electromagnetic solenoid that applies a force in the longitudinal direction to the spool valve, and a spring member that applies a force to the electromagnetic solenoid to the spool valve,
An internal combustion engine provided with means for reducing the pulsating pressure in the first and second supply / discharge passages to attenuate the action of the pulsation of the hydraulic oil due to the reversal torque acting on the camshaft on the control valve. Valve timing change device.

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