JP2003222265A - Control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To advantageously prevent malfunction of a control valve caused by a foreign matter in a working fluid. <P>SOLUTION: In this control valve 3 provided between a hydraulic source 1 and an actuator 2, a spool valve 11 is provided slidably in a valve body 10, and an opening 12 on the hydraulic source 1 side of the valve body 10 and openings 13 and 14 on the actuator 2 side are opened/closed by the spool valve 11. At the openings 13 and 14 of the control valve 3, filters 38 and 39 are provided with a hook part formed on one end and a hook locking part formed on the other end. The filters 38 and 39 have a tensile force act on the hook lock part and the hook part by having the hook part locked by the hook lock part and is mounted to the valve body 10 in that state. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve used for controlling various hydraulic 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. .

[0002]

2. Description of the Related Art A hydraulic device such as a valve timing changing device is arranged between a hydraulic power source, an actuator operated by hydraulic oil supplied from the hydraulic power source, and between the hydraulic power source and the actuator. And a control valve for controlling the supply of hydraulic oil to and the discharge of hydraulic oil from the actuator.

Further, the hydraulic system is provided with a filter for filtering the hydraulic oil in order to prevent foreign matter from being mixed into the hydraulic oil to cause malfunction of the control valve and the like. Is generally provided only in the passage leading from the hydraulic source to the control valve (for example, JP-A-8-140).
No. 15).

[0004]

However, in the above-mentioned 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. , The hydraulic oil circulated in the actuator cannot be filtered. Therefore, for some reason, foreign matter generated inside the actuator may enter the control valve, resulting in malfunction of the control valve.

The present invention has been devised in view of the above conventional circumstances, and it is an object of the present invention to provide a control valve capable of advantageously preventing malfunction of the control valve due to foreign matter in the hydraulic oil. To aim.

[0006]

Therefore, the invention according to claim 1 is a tubular valve body having an opening communicating with a hydraulic source and an opening communicating with an actuator, and slidable in the valve body. And a spool valve capable of opening and closing the opening portion of the valve body, wherein a hook portion is formed on one end side and a hook locking portion is formed on the other end side at least at the actuator side opening portion of the valve body. A formed filter is provided, and the filter is attached to the valve body in such a state that a tension force is applied to the hook engaging portion and the hook portion by engaging the hook portion with the hook engaging portion. It has a structure that consists of:

According to a second aspect of the invention, in the configuration of the first aspect of the invention, the filter is a filter body.
It is formed from a frame provided on the outer peripheral side of this filter,
The frame body is made of a synthetic resin material.

According to a third aspect of the present invention, in the configuration of the first or second aspect of the invention, a plurality of axial crosspiece members are formed so as to have a projection shape on the inner peripheral portion of the filter. One of the crosspiece members also serves as a hook locking portion.

Further, the invention according to claim 4 is based on claim 1
In the configuration of the invention described in any one of 3 above, a peripheral groove is formed in the opening of the valve body, and the filter is mounted in the peripheral groove.

Further, the invention according to claim 5 is based on claim 1
In the configuration of the invention described in any one of 4 above, a valve timing for changing the opening / closing timing of the intake valve or the exhaust valve by changing the rotation phase of the camshaft that drives the intake valve or the exhaust valve with respect to the rotation of the internal combustion engine. The control device is controlled.

In such a structure, the control valve controls the supply of hydraulic oil from the hydraulic source to the actuator and the discharge of hydraulic oil from the actuator by controlling the control valve or the like. Specifically, when the spool valve is driven, the spool valve controls the opening / closing of the opening of the valve body to control the flow rate of the hydraulic oil passing through each opening. As a result, the hydraulic oil guided to the actuator via the control valve is controlled, and the operation of the actuator is controlled.

Here, the hydraulic oil discharged from the actuator through the control valve is filtered by the filter provided in the opening on the actuator side. 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 prevented from entering the control valve.

Therefore, since only clean hydraulic oil is introduced into the control valve, the control valve operates smoothly.

Further, since the filter is provided at the opening of the valve body, it is easier to mount the filter and the hydraulic pressure between the actuator and the control valve is higher than that when the filter is provided in the middle of the hydraulic passage. The hydraulic oil over the entire range of the passage is filtered and filtered.

Further, since the filter is attached to the valve body in such a state that a tension is applied between the filters by engaging the hook portion with the hook engaging portion, the filter can be easily attached to the valve body. As well, a firm lock is achieved.

According to the second aspect of the present invention, the filter is formed of the filter body and the frame body made of synthetic resin provided on the outer peripheral side of the filter body, so that the filter is easy to handle. At the same time, mounting becomes easy.

According to the fourth aspect of the present invention, since the filter is attached to the circumferential groove formed in the opening of the valve body, the filter is correctly positioned in the axial direction of the valve body, and the filter is positioned in the opening of the valve body. Can be placed correctly against.

According to the fifth aspect of the invention, since the filter is provided at the opening portion of the control valve on the valve timing changing device side, the filter filters the hydraulic oil and acts on the camshaft. It is possible to reduce the change in the rotation phase due to the reversal torque as much as possible. That is,
The valve timing changing device may generate a pulse pressure therein due to the reversal torque acting on the camshaft, and the pulse pressure of the hydraulic oil may act on the control valve to leak from the control valve. When the hydraulic oil leaks from the control valve, the rotational phase of the camshaft is unintentionally changed, but in the present invention, when the pulsating pressure of the hydraulic oil tries to act on the control valve, Acts as a resistance to damp the pulsation of hydraulic fluid. Therefore, it is possible to reduce the influence of the reversal torque acting on the camshaft.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIGS. 3 to 6 are drawings showing an embodiment of the present invention, and FIGS. 1 and 2 are reference explanatory views having the same basic structure as this embodiment except the structure and arrangement of the filter. First, the device of this reference explanatory diagram will be described.

FIG. 1 is an explanatory view of the hydraulic system, and FIG. 2 is a sectional view of the control valve shown in FIG.

In FIGS. 1 and 2, reference numeral 1 is a hydraulic pressure source, and 2 is an actuator operated by hydraulic fluid supplied from the hydraulic pressure source 1. Reference numeral 3 denotes a control valve arranged between the hydraulic pressure source 1 and the actuator 2, and 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 pressure source 1 is mainly composed of a hydraulic pump, and the hydraulic pressure source 1 and the control valve 3 are connected by a supply passage 4.

In this embodiment, the actuator 2 is a valve timing changing device for an internal combustion engine. The valve timing changing device includes a sprocket 5 that is rotated in synchronization with the rotation of the internal combustion engine, and It is provided between the external intake valve and the camshaft 6 for driving the exhaust valve, and the hydraulic oil causes the camshaft 6 to relatively rotate with respect to the sprocket 5 to change the opening / closing timing of the intake valve or the exhaust valve. It has become. That is, the sprocket 5 is connected to and driven by a crankshaft (not shown) via a timing chain 7 wound around the outer circumference, and the camshaft 6 is driven by a cam (not shown) formed on the camshaft 6. It is designed to open and close the intake valve or the exhaust valve. Further, the actuator 2 and the control valve 3 are communicated with each other through intake and exhaust passages 8 and 9.

The control valve 3 is a cylindrical valve body 10.
And a spool valve 11 which is slidably accommodated in the tubular body of the valve body 10.

The valve disc 10 has an opening 12 communicating with the hydraulic source 1 and an opening 1 communicating with the actuator 2.
3, 14 are formed. 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 communicates with the actuator 2 via the suction / discharge passage 9. The valve body 10 has an opening 15 formed therein.
Is connected to the oil storage tank 17 through the drain passage 16. The openings 12, 13, 14, 15
Is a circumferential groove 22 formed on the outer periphery of the body of the valve body 10,
Opening faces 23, 24 and 25 respectively.

The spool valve 11 is a valve body 10.
It is biased toward the electromagnetic solenoid 29 by a spring member 28 provided therein, and is driven by this electromagnetic solenoid 29 so that it can slide in the valve body 10. The spool valve 11 slides in the valve body 10 so that the openings 12, 13,
The lands 14 and 15 can be opened and closed by the lands 30 and 31.

One end of the spring member 28 has a spring receiver 32.
The spring bearing 32 is supported by the retaining ring 3
Withdrawal is prevented by 3. A connection terminal 34 is provided at the 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 power source 1 and the control valve 3, and filters 38 and 39 are provided between the actuator 2 and the control valve 3. More specifically, the filter 37 is provided in the middle of the supply passage 4 between the hydraulic power source 1 and the control valve 3, and the filter 38 is provided in the middle of the intake / discharge passage 8 between the actuator 2 and the control valve 3. The filter 39 is provided in the intake / exhaust passage 9 between the actuator 2 and the control valve 3.

Next, the operation of the hydraulic device having such a configuration will be described.

First, in a state (a non-energized state) in which a control current is not supplied to the electromagnetic solenoid 29 from a control device and a power source (not shown), the spool valve 11 is biased 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 portion 30 of the spool valve 11 and the opening portion 13 of the valve body 10 open the opening portion 1.
The land portion 31 opens a predetermined area on the side 2 and the land portion 31 opens the opening portion 14 on the side of the opening portion 15 a predetermined area. Therefore, from the hydraulic pressure source 1 to the supply passage 4 and the opening 1
The hydraulic oil introduced into the valve body 10 via 2 is introduced into the actuator 2 via the opening 13 and the intake / exhaust passage 8. On the other hand, the intake / exhaust passage 9 communicates with the oil storage tank 17 through the opening 14, the opening 15 and the drain passage 16.

As a result, the actuator 12 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 electromagnetic solenoid 29 drives the spool valve 11, and the spool valve 11 moves rightward in FIG. 1, whereby the land portion 30 of the spool valve 11 opens the opening portion 13 of the valve body 10 and the opening portion 15 thereof.
On the side of the opening 12, the land portion 31 opens the opening 14 on the side of the opening 12 by a predetermined area. Therefore, the hydraulic oil introduced from the hydraulic pressure source 1 into the valve body 10 through the supply passage 4 and the opening 12 is introduced into the actuator 2 through the opening 14 and the intake / exhaust passage 9. On the other hand, the intake / exhaust passage 8 communicates with the oil storage tank 17 through the opening 13, 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 retard direction with respect to the sprocket 5.

Here, the working oil introduced from the hydraulic pressure source 1 to the actuator 2 via the control valve 3 is filtered by the filter 37 provided between the hydraulic pressure source 1 and the control valve 3, and the actuator 2 And a control valve 3 provided between the control valve 3 and the control valve 3. The hydraulic oil discharged from the actuator 2 via the control valve 3 is filtered by the filter 38 or the filter 39 provided between the actuator 2 and the control valve 3. That is, the hydraulic oil from the hydraulic power source 1 toward the control valve 3 is filtered by the filter 37, and the hydraulic oil from the actuator 2 toward the control valve 3 is filtered by the filters 38, 39.
Is filtered with.

As a result, foreign matter mixed in 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.

Therefore, since only clean hydraulic oil is introduced into the control valve 3, the control valve 3 operates smoothly.

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

Further, since the actuator 2 is a valve timing changing device and filters 38 and 39 are provided between the valve timing changing device and the control valve 3, the operating oil is supplied by the filters 38 and 39. While filtering, it is possible to reduce the change in the rotational phase due to the reversal torque acting on the camshaft 6 as much as possible. That is, the valve timing changing device includes the camshaft 6
There is a possibility that the pulse pressure of the working oil may act on the control valve 3 and leak from the control valve due to the reversal torque acting on the control valve. When the hydraulic oil leaks from the control valve 3, the rotational phase of the camshaft 6 is changed against the intention, but in this device, 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 resistance to damp the pulsation of the hydraulic oil. Therefore, the influence of the reversing torque acting on the camshaft 6 can be reduced.

Next, the embodiment of the present invention shown in FIGS. 3 to 6 will be described. The difference of this embodiment from that of the reference diagram is that filters 38 and 39 provided between the actuator 2 and the control valve 3 are provided at the openings 13 and 14 of the valve body 10, respectively. Hereinafter, the embodiment will be described in detail, but in the description, the same components as those of the reference diagram are denoted by the same reference numerals, and the duplicate description thereof will be omitted.

That is, the filter 38 is the valve body 1
0 is provided in the opening 13, and the filter 39 is also provided in the opening 14.

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

Each of the filters 38 and 39 has
A hook portion 43 is formed on one end side, and a hook locking portion 44 is formed on the other end side. Further, a plurality of crosspiece members 45 in the axial direction are formed so as to have a projection shape on the inner peripheral side of the substantially C shape, and one of these crosspiece members 45 is formed at the end portion, and the hook engaging portion is formed. It also serves as 44 (see FIG. 5).

Each of the filters 38 and 39 is provided on the valve body 10, more specifically, the circumferential groove 2 of the valve body 10.
3 and 24, and in the state of being attached to the valve body 10, the hook engaging portion 44 is engaged with the hook portion 43 to form a generally annular shape. Each of the filters 38, 39 is
By being installed in the circumferential grooves 23, 24 of the valve body 10, the valve body 10 is correctly positioned in the axial direction and is properly arranged with respect to the openings 13, 14 of the valve body 10.

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 locked to the hook locking portion 44, the filter 38 and 39 are substantially ring-shaped. , Hook portion 43 and hook locking portion 44
A tensile force is applied to this, and a firm lock is achieved.

In this configuration as well, since the working oil toward the control valve 3 is filtered by the filters 37, 37, 38, only clean working oil is introduced into the control valve 3. The control valve 3 will operate smoothly.

Therefore, it is possible to obtain the hydraulic device which can advantageously prevent the malfunction of the control valve 3 from being caused by the foreign matter in the hydraulic 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 are connected to the intake and exhaust passages 8,
As compared with the case where it is provided in the middle of No. 9, the installation is easier, and the working oil over the entire range of the intake and exhaust passages 8 and 9 between the actuator 2 and the control valve 3 is filtered and filtered. It

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.

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, it is easy to handle and is easy to mount. It will be easy.

7 and 8 are views showing another embodiment of the present invention. The difference between this embodiment and the above embodiment is that a filter 37 provided between the hydraulic power source 1 and the control valve is provided. In addition, the filters 38 and 39 provided between the actuator 2 and the control valve 3 are provided in the opening 1 of the valve body 10.
This is a point provided on each of 2, 13, and 14. Hereinafter, this embodiment will be described in detail. In the description, the same components as those in the above-mentioned embodiment are designated by the same reference numerals, and the duplicated description will be omitted.

That is, the filter 37 is the valve body 1
0 is provided in the opening 12, 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 structure as the filters 38 and 39 described in the above embodiment. That is, the filters 37, 38 and 39 are used as common parts.

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

Although the embodiment has been described above with reference to the drawings, the specific configuration is not limited to this embodiment, and can be modified within the scope of the invention.

[0058]

As described above in detail, according to the present invention, it is possible to obtain a hydraulic device which can advantageously prevent malfunction of the control valve due to foreign matter in the hydraulic oil.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a reference hydraulic device for explaining an embodiment of the present invention.

2 is a cross-sectional view of the control valve shown in FIG.

FIG. 3 is an explanatory diagram of a hydraulic device showing an embodiment of the present invention.

4 is a cross-sectional view of the control valve shown in FIG.

5 is a front view (a) and an enlarged arrow view (b) in the direction of arrow B in the front view (a) showing the free state of the filter shown in FIG. 3;
It is a drawing shown by.

FIG. 6 is a drawing showing a mounted state of the filter shown in FIG. 3 as a front view (a) and an enlarged view (b) of a B portion of the front view (a).

FIG. 7 is an explanatory diagram of a hydraulic device showing another embodiment of the present invention.

8 is a cross-sectional view of the control valve shown in FIG.

[Explanation of symbols]

1 ... Hydraulic power source 2 ... Actuator 3 ... Control valve 10 ... Valve body 11 ... Spool valve 12, 13, 14 ... Opening 37, 38, 39 ... Filter 43 ... Hook part 44 ... Hook locking part

Claims (5)

[Claims] 1. A tubular valve body having an opening communicating with a hydraulic source and an opening communicating with an actuator,
A spool valve slidably accommodated in the valve body and capable of opening and closing the opening of the valve body is provided, and at least the actuator-side opening of the valve body is
A filter having a hook portion formed on one end side and a hook engaging portion formed on the other end side is provided, and the filter is provided with a hook engaging portion by engaging the hook portion with the hook engaging portion. A control valve which is attached to a valve body in such a state that a tensile force is applied to the hook portion. 2. The filter is formed of a filter body and a frame body provided on the outer peripheral side of the filter body, and the frame body is made of a synthetic resin material. The control valve according to item 1. 3. A plurality of axial crosspiece members are formed so as to have a projection shape on the inner peripheral portion of the filter, and one of the crosspiece members also serves as a hook locking portion. The control valve according to claim 1 or 2. 4. The control valve according to claim 1, wherein a peripheral groove is formed in the opening of the valve body, and the filter is mounted in the peripheral groove. . 5. A valve timing control device for changing the opening / closing timing of an intake valve or an exhaust valve by changing the rotational phase of a camshaft which drives the intake valve or the exhaust valve with respect to the rotation of an internal combustion engine. Claim 1 characterized by
The control valve according to any one of to 4.