JP3949100B2 - Control valve for valve timing change device of internal combustion engine - Google Patents

Description

The present invention relates to a control valve of 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.

A conventional valve timing changing device for an internal combustion engine includes, as its hydraulic device, a hydraulic source, an actuator that is operated by hydraulic oil supplied from the hydraulic source, and a hydraulic source that is disposed between the hydraulic source and the actuator. And a control valve that controls supply of hydraulic oil to the actuator and discharge of hydraulic oil from the actuator.

In addition, the hydraulic device includes a filter for filtering the hydraulic oil in order to prevent foreign matters from being mixed into the hydraulic oil and causing malfunction of the control valve and the like. 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 from the hydraulic source to the control valve, the hydraulic oil from the hydraulic source can be filtered, but the hydraulic fluid circulating through the actuator is filtered. Can not do it. For this reason, there is a possibility that foreign matters generated inside the actuator for some reason enter the control valve and cause malfunction of the control valve.

The present invention has been devised in view of the above-described conventional situation, and advantageously prevents malfunction of the control valve due to foreign matter in the hydraulic oil, and reduces the pulse pressure of the hydraulic oil with respect to the control valve. The purpose is to provide a control valve that can be used.

The present invention has been devised in view of the above-described conventional technical problems, and the invention according to claim 1 drives the intake valve or the exhaust valve by a sprocket that rotates in synchronization with the rotation of the engine and a cam. a cam shaft provided between, and by that control the discharge of hydraulic fluid from a supply or internal of the hydraulic oil to inside hydraulic source, by relatively rotating the camshaft relative to the sprocket the A control valve of a valve timing changing device for an internal combustion engine that changes the opening / closing timing of an intake valve or an exhaust valve, the control valve being slidably accommodated in a cylindrical valve body and the inside of the valve body A spool valve, and the valve body includes an opening facing the other end of the supply passage, one end of which is connected to the hydraulic power source, and one end connected to the inside of the valve timing changing device. It has a plurality of openings facing the other end of the exhaust passage, each opening is formed to open to a circumferential groove formed on the outer periphery of the body of the valve body, and in each circumferential groove, A filter that attenuates a pulse pressure generated from a reverse torque acting on the camshaft with respect to the hydraulic oil discharged from the valve timing changing device through the supply / discharge passages into the valve body covers the openings. The filter is configured by a filter body and a frame body provided on the outer periphery of the filter body, and the filter body is attached in each circumferential groove by the frame body. It is said.

In the invention according to claim 2, the filter has a hook portion formed at one end side, and a hook locking portion formed at the other end side, and the hook locking portion is provided with the hook portion. It is characterized by being attached to the valve body by locking.

According to a third aspect of the present invention, the control valve applies an electromagnetic solenoid that applies a pressing force in the axial direction of the spool valve, and applies a spring force to the spool valve in opposition to the pressing force of the electromagnetic solenoid. And a spring member to be provided.

In the configuration of the present invention, the control valve is controlled by a control device or the like, so that the supply of hydraulic oil from the hydraulic source to the actuator that is a part of the valve timing changing device and the discharge of the hydraulic oil from the actuator are controlled. Is done. Specifically, for example, when the spool valve of the control valve is driven, the spool valve controls the opening of the valve body to control the flow rate of the hydraulic oil passing through each opening. Thus, the hydraulic fluid introduced to the actuator is controlled, and the operation of the actuator is controlled.

Here, the hydraulic oil discharged via the control valve from the actuator is filtered by the filter provided in the circumferential direction within the groove of the braking valve.

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

For this reason, only clean hydraulic fluid is introduced into the control valve, so that the control valve operates smoothly .

Moreover, as described above, by the filter provided in the control valve of the circumferential groove, it is possible to reduce a change in rotational phase by reversing torque acting on the camshaft as possible.

That is, the valve timing changing device (actuator) generates a pulse pressure inside due to the reverse torque acting on the camshaft, and the pulse pressure of the hydraulic oil may act on the control valve and leak from the control valve. When hydraulic oil leaks from this control valve, the rotational phase of the camshaft is changed unexpectedly. In the present invention, when the hydraulic oil pulsation is about to act on the control valve, the filter Becomes resistance and attenuates pulsation of hydraulic oil. For this reason, the influence by the reverse torque which acts on the camshaft can be reduced .

According to the present invention, it is possible to advantageously prevent the malfunction of the control valve due to foreign matter in the hydraulic oil, and the filter becomes a resistance when the pulse pressure of the hydraulic oil is about to act on the control valve. Damping the pulsation of hydraulic oil. For this reason, the influence by the reverse torque which acts on the said camshaft can be reduced .

Moreover, since the said filter is comprised from the filter body and the frame provided in the outer peripheral side of this filter body, while being easy to handle, attachment becomes easy.

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

FIG. 1 is an explanatory view of a valve timing changing device for an internal combustion engine showing a reference example of the present invention, and FIG. 2 is a cross-sectional view of the control valve shown in FIG.

In FIG, 1 is a hydraulic source, 2 is actuated by hydraulic oil supplied from the hydraulic source 1 actuator, 3 is a arranged a control valve between said hydraulic pressure source 1 and the actuator 2, the control valve 3 Controls the supply of hydraulic oil from the hydraulic source 1 to the actuator 2 and the discharge of hydraulic oil from the actuator 2.

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

The actuator 2 includes a sprocket 5 which is rotated in synchronization with the rotation of the inner combustion engine, provided between the cam shaft 6 for driving the intake valve or the exhaust valve outside the figure, the hydraulic oil with respect to the sprocket 5 Thus, 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 and driven to 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 exhaust valve is driven to open and close. Further, between the actuator 2 and the control valve 3 is communicated with the supply and discharge passages 8 and 9.

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

Wherein the valve body 10 has a first opening 12 communicating with the hydraulic source 1, a second communicating with the actuator 2, it is the third opening 13 is formed. That is, the first opening 12 is adapted to communicate with the hydraulic pressure source 1 via the supply passage 4, the second opening 13 communicates with the actuator 2 through the supply and discharge passage 8, the third opening 14 is configured to communicate with the actuator 2 through the supply and discharge passages 9. Further, the valve body 10 is Yes and fourth opening 15 is formed, the fourth opening 15 is configured to communicate with the oil storage tank 17 via the drain passage 16. The first to fifth openings 12, 13, 14, 15 are respectively opened facing the first through fourth circumferential grooves 22, 23, 24, 25 formed in the body portion outer periphery 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. The spool valve 11, by sliding the valve body 10, which is capable of opening and closing the first to fifth openings 12, 13, 14, 15 formed in the valve body 10 at the respective land portions 30 and 31 .

  One end side of the spring member 28 is supported by a spring receiver 32, and the spring receiver 32 is prevented from being detached by a retaining ring 33. A connection terminal 34 is provided at the connection end of the electromagnetic solenoid 29 so as to be connected to a control device and a power source not shown.

A first filter 37 is provided between the hydraulic power source 1 and the control valve 3, and second and third filters 38 and 39 are provided between the actuator 2 and the control valve 3. It has been. Specifically, the first filter 37 is provided in the middle of the supply passage 4 between the hydraulic source 1 and the control valve 3, and the second filter 38 is supplied and discharged between the actuator 2 and the control valve 3. is provided in the middle of the passage 8, the third filter 39 are provided at the middle of the intake 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, the in a state where the control current to the electromagnetic solenoid 29 from the controller and power supply, not shown is not supplied (non-energized state), the spool valve 11 is urged to the left in FIG. 1 by the spring force of the spring member 28 stopped to a Jo Tokoro (see FIG. 1).

In the non-energized state, the land portion 30 of the spool valve 11 opens the second opening 13 of the valve body 10 at a predetermined area on the first opening 12 side, and the land portion 31 opens the third opening 14 to the fourth opening. A predetermined area is opened on the part 15 side. Therefore, the supply passage 4 from the hydraulic source 1, hydraulic oil guided into the valve body 10 through the first opening 12, the electrically to the actuator 2 through the second opening 13 and the supply and discharge passage 8 It is burned. On the other hand, the supply and discharge passage 9, the third opening 14 communicates with the fourth opening 15 and the oil storage tank 17 via the drain passage 16.

  Accordingly, 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 portion 30 of the spool valve 11 connects the second opening 13 of the valve body 10 to the fourth opening. The land portion 31 opens a predetermined area on the 15th side, and the land portion 31 opens the third opening 14 on the first opening 12 side. Therefore, the hydraulic source 1 supplying passage 4, the hydraulic oil guided into the valve body 10 through the opening 12 is directed to the actuator 2 via the third opening 14 and the supply and discharge passages 9. On the other hand, the supply and discharge passage 8, the second opening 13 communicates with the oil storage tank 17 through the fourth 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 retarding direction with respect to the sprocket 5.

Here, hydraulic oil introduced from the hydraulic source 1 to the actuator 2 via the control valve 3, as well as bulk filtration by the first filter 37 provided between the hydraulic pressure source 1 and the control valve 3, the actuator 2 the second filter 38 or the third filter 39 provided between the control valve 3 and are umbrella filtration. Further, the hydraulic oil discharged via the control valve 3 from the actuator 2 is a bulk filtration by the second filter 38 or the third filter 39 provided between the actuator 2 and the control valve 3. In other words, the hydraulic oil flowing from the hydraulic source 1 to the control valve 3 is a bulk filtration by the first filter 37, the hydraulic fluid flowing from the actuator 2 to control valve 3 is bulk filtration by filter 38 and 39.

As a result, the foreign matter mixed in the hydraulic oil due to the wear of the actuator 2 is removed by the second filter 38 or the third filter 39 and is prevented from entering the control valve 3.

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

  Therefore, a hydraulic apparatus that can advantageously prevent the malfunction of the control valve 3 due to foreign matter in the hydraulic oil is obtained.

Further, a part of the actuator 2 is the valve timing apparatus, the second between the actuator 2 and the control valve 3, since the third filter 38, 39 is provided, the second, third filter by 38 and 39, as well as over-filtration hydraulic oil, it can be reduced as much as possible the change of the rotational phase by reversing torque acting on the camshaft 6.

That is, the actuator 2 generates a pulse pressure inside due to the reverse 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 changed unexpectedly. In this embodiment, the pulse pressure of hydraulic oil will act on the control valve 3. Then, the second and third filters 38 and 39 become resistances and attenuate the pulsation of the hydraulic oil. For this reason, the influence by the reverse torque which acts on the camshaft 6 can be reduced.

3 to 6 in the drawing showing the form of implementation of the present invention, the second, third filter 38 where this embodiment is changed to the reference example, provided between the actuator 2 and the control valve 3 , 39 are provided in the second and third openings 13, 14 of the valve body 10, respectively. Hereinafter, this embodiment will be described in detail.

In the description, the same components as those in the reference example are denoted by the same reference numerals, and redundant description thereof is omitted.

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

The second, each of the third filters 38, 39, and filtration Kakarada 41, the filtration Kakarada consists frame 42 provided on the outer peripheral side of 41, and formed in a substantially C-shape in a free state is there. The filtration Kakarada 41 is formed of a metal wire in a mesh shape, the frame 42 is formed of a synthetic resin material.

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

The second, each of the third filters 38 and 39, the valve body 10, more specifically the second valve body 10, and adapted to be mounted to the third circumferential groove 23 and 24, the valve body 10 In the attached state, the hook portion 43 is locked to the hook locking portion 44 so as to form a substantially annular shape as a whole. The second, each of the third filters 38 and 39, by being attached to each circumferential groove 23, 24 of the valve body 10, is correctly positioned in the axial direction of the valve body 10, the second valve body 10, It is correctly arranged with respect to the third openings 13 and 14.

Further, each of the second and third filters 38 and 39 is formed in a substantially C shape in a free state, so that the hook portion 43 is locked to the hook locking portion 44 to be substantially annular. In the state, a tensile force acts on the hook portion 43 and the hook locking portion 44, and a firm locking is achieved.

Also in this configuration, the hydraulic fluid toward the control valve 3 is first, the second, third filter 37, 38 and 39, since the bulk filtration, the control valve 3 clean hydraulic oil Nomigashirube Therefore, the control valve 3 operates smoothly.

  Therefore, it is possible to advantageously prevent malfunction of the control valve 3 due to foreign matter in the hydraulic oil.

In addition, the second, from the third filter 38 and 39 are respectively provided on the second, third openings 13, 14 of the valve body 10, a second, supply and discharge each of the third filters 38, 39 compared with a case of providing in the middle of the passage 8 and 9, the mounting together is facilitated, and the actuator 2 and the target hydraulic fluid over-filtration over the entire range of supply and discharge passages 8 and 9 between the control valve 3 it is bulk filtration in.

  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, it can be easily attached to the valve body 10.

The second, each of the third filters 38, 39, and filtration Kakarada 41, from being formed from the frame body 42 provided on the outer peripheral side of the filtration Kakarada 41, is easy to handle At the same time, the mounting becomes easy.

FIGS. 7 and 8 show another embodiment of the present invention. This embodiment is different from the first embodiment in that a first filter 37 provided between the hydraulic power source 1 and the control valve 3 is shown. The second and third filters 38 and 39 provided between the actuator 2 and the control valve 3 are provided in the first to third 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 in the above-described embodiment are denoted by the same reference numerals, and redundant description thereof is omitted.

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

The first filter 37 is configured in the same manner as the second and third filters 38 and 39 described in the embodiment. That is, the first to third filters 37, 38, 39 are used as common parts.

  Even in such a configuration, the same operation and effect as the above-described embodiment can be obtained.

  Although the embodiment has been described with reference to the drawings, the specific configuration is not limited to this embodiment and can be changed without departing from the gist of the invention.

It is explanatory drawing of the hydraulic device which shows embodiment of this invention. It is sectional drawing of the control valve shown in FIG. It is explanatory drawing of the hydraulic device which shows another embodiment of this invention. It is sectional drawing of the control valve shown in FIG. It is drawing which shows the free state of the filter shown in FIG. 3 with the enlarged arrow line view (b) of the arrow B direction of a front view (a) and a front view (a). It is drawing which shows the mounting state of the filter shown in FIG. 3 with the front view (a) and the B section enlarged view (b) of the front view (a). It is explanatory drawing of the hydraulic device which shows another embodiment of this invention. It is sectional drawing of the control valve shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hydraulic source 2 ... Actuator 3 ... Control valve 10 ... Valve body 11 ... Spool valve 12, 13, 14 ... 1st-3rd opening part
22, 23, 24, 25 ... first to fourth circumferential grooves 37, 38, 39 ... first to third filters

Claims (3)

And the sprocket to rotate in synchronism with rotation of the engine, and the camshaft which drives the intake valve or the exhaust valve by the cam provided between the discharge of the working oil from the supply or internal of the hydraulic oil to inside hydraulic source by control Gosuru, wherein a control valve of the valve timing apparatus for an internal combustion engine camshaft pivoted relative to change the closing timing of the intake valve or the exhaust valve with respect to said sprocket,
The control valve includes a cylindrical valve body, and a spool valve slidably accommodated inside the valve body,
The valve body has a plurality of openings facing the other end of the supply passage, one end of which is connected to the hydraulic power source, and the other end of each supply / discharge passage having one end connected to the inside of the valve timing changing device. Each of the openings has an opening facing a circumferential groove formed on the outer periphery of the body of the valve body;
In each of the circumferential grooves, the pulse pressure generated from the reverse torque acting on the camshaft is attenuated with respect to the hydraulic oil discharged from the valve timing changing device through the supply / discharge passages into the valve body. A filter is provided to cover each of the openings;
The internal combustion engine characterized in that the filter is constituted by a filter body and a frame body provided on an outer periphery of the filter body, and the filter body is attached in each circumferential groove by the frame body. Control valve for valve timing change device. The filter has a hook portion formed on one end side and a hook engaging portion formed on the other end side, and is attached to the valve body by engaging the hook portion on the hook engaging portion. The control valve of the valve timing changing device for an internal combustion engine according to claim 1, wherein The control valve includes: an electromagnetic solenoid that applies a pressing force in the axial direction of the spool valve; and a spring member that applies a spring force to the spool valve in opposition to the pressing force of the electromagnetic solenoid. A control valve for a valve timing changing device for an internal combustion engine according to claim 1 or 2.

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