JP3897685B2 - Hydraulic device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic apparatus including 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.
[0002]
[Prior art]
This type of hydraulic apparatus includes a hydraulic source, an actuator that is operated by hydraulic oil supplied from the hydraulic source, and a hydraulic oil supply from the hydraulic source to the actuator and an actuator that is disposed between the hydraulic source and the actuator. And a control valve for controlling discharge of hydraulic oil from the engine.
[0003]
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.
[Patent Document 1]
Japanese Patent Application Laid-Open No. 8-14015
DISCLOSURE OF THE INVENTION
[Problems to be solved by the invention]
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 fluid 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.
[0005]
The present invention has been devised in view of the above-described conventional situation, and an object of the present invention is to provide a hydraulic device that can advantageously prevent malfunction of a control valve due to foreign matter in hydraulic oil. .
[0006]
[Means for Solving the Problems]
Accordingly, a first aspect of the present invention, the hydraulic source and the Bal pig timing changing device for changing the opening and closing timing of the intake valve or exhaust valve by hydraulic oil supplied from the hydraulic source, the hydraulic source and the valve timing apparatus And a control valve for controlling the supply of hydraulic oil from the hydraulic pressure source to the valve timing change device and the discharge of hydraulic oil from the valve timing change device, and the operation from the valve timing change device toward the control valve A filter for filtering oil, and the control valve has a cylindrical valve body having an opening communicating with a hydraulic pressure source and an opening communicating with the valve timing changing device, and is slidable in the valve body housed in, while being and an openable spool valve openings of said valve body, said filter, the valve of the valve body Provided in the opening communicating with the timing changing device, a filter body which confers resistance to attenuate the pulse pressure of the hydraulic fluid generated in the valve timing changing device, a frame body provided on an outer peripheral side of the filter body The hook portion is formed on one end side, and the hook engaging portion for engaging with the hook portion is formed on the other end side.
[0007]
In such a configuration, the control valve is controlled by a control device or the like, whereby the supply of hydraulic oil from the hydraulic pressure source to the valve timing changing device and the discharge of the hydraulic oil from the valve timing changing device are controlled. Specifically, for example, when the spool valve of the control valve is driven, the spool valve controls the opening and closing of the opening of the valve body, thereby controlling the flow rate of the working oil passing through each opening.
[0008]
As a result, the hydraulic fluid guided to the valve timing changing device via the control valve is controlled, and the operation of the valve timing changing device is controlled.
[0009]
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.
[0010]
As a result, foreign matter mixed in the hydraulic oil due to wear of the valve timing changing device 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.
[0011]
Therefore, it is possible to obtain a hydraulic apparatus that can advantageously prevent the malfunction of the control valve due to the foreign matter in the hydraulic oil.
[0012]
Further, since the control valve is provided with a filter that allows the hydraulic oil discharged from the valve timing changing device to pass therethrough, a change in the rotational phase due to the reverse torque acting on the camshaft can be reduced as much as possible.
[0013]
In other words, the valve timing changing device may generate a pulse pressure therein 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 the control valve, the rotational phase of the camshaft is changed unexpectedly. In the present invention, when the pulse pressure of hydraulic oil 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.
[0014]
In the invention according to claim 2 , the filter is formed in a substantially C shape in a natural state, and a plurality of crosspiece members are formed along the axial direction on the inner peripheral side and formed at the end. Further , one of the crosspiece members is formed as the hook engaging portion.
[0015]
【The invention's effect】
According to the present invention, it is possible to obtain a hydraulic apparatus that can advantageously prevent malfunction of the control valve due to foreign matter in the hydraulic oil.
[0016]
In addition, when the pulsation pressure of the hydraulic oil discharged from the valve timing changing device tries to act on the control valve, the filter becomes a resistance and attenuates the pulsation of the hydraulic oil. For this reason, the influence by the reverse torque which acts on the camshaft can be reduced.
[0017]
Further, when the hook is engaged with the hook engaging portion, a tensile force acts on the hook portion and the hook engaging portion, so that the filter can be firmly locked and the hook engaging portion. By locking the hook portion to the valve body, it can be easily attached to the valve body.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an embodiment of a hydraulic apparatus according to the present invention, and FIG. 2 is a cross-sectional view of the control valve shown in FIG.
[0019]
In the figure, 1 is a hydraulic pump that is a hydraulic source , and 2 is a valve timing changing device that is operated by hydraulic fluid supplied from the hydraulic pump 1. 3 is a control valve disposed between the hydraulic pump 1 and the valve timing changing device 2, and this control valve 3 is supplied from the hydraulic pump 1 to the valve timing changing device 2 and from the valve timing changing device 2. The discharge of hydraulic oil is controlled.
[0020]
The hydraulic pump 1 and the control valve 3 communicate with each other through a supply passage 4.
[0021]
The valve timing changing device 2 is a valve timing changing device for an internal combustion engine. The valve timing changing device 2 is provided between a sprocket 5 that rotates in synchronization with the rotation of the internal combustion engine and a camshaft 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.
[0022]
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 a cam (not shown) formed on the camshaft 6. Thus, the intake valve or the exhaust valve is driven to open and close. Further, the valve timing changing device 2 and the control valve 3 communicate with each other through intake / exhaust passages 8 and 9.
[0023]
As shown in FIG. 2 , 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.
[0024]
The valve body 10 is formed with an opening 12 communicating with the hydraulic pump 1 and openings 13 and 14 communicating with the valve timing changing device 2. The opening 12 communicates with the hydraulic pump 1 through the supply passage 4, the opening 13 communicates with the valve timing changing device 2 through the intake / exhaust passage 8, and the opening 14 communicates with the intake / exhaust passage 9. It communicates with the valve timing changing device 2 via. An opening 15 is formed in the valve body 10, and the opening 15 communicates with the oil storage tank 17 through the drain passage 16. The openings 12, 13, 14, 15 open to the circumferential grooves 22, 23, 24, 25 formed on the outer periphery of the body of the valve body 10.
[0025]
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 can open and close the opening portions 12, 13, 14, and 15 formed in the valve body 10 by the land portions 30 and 31 by sliding in the valve body 10.
[0026]
One end of the spring member 28 is supported by a spring receiver 32, and the spring receiver 32 is prevented from being removed 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.
[0027]
Further, a filter 37 is provided between the hydraulic pump 1 and the control valve 3, and filters 38 and 39 are provided between the valve timing changing device 2 and the control valve 3. Specifically, the filter 37 is provided in the middle of the supply passage 4 between the hydraulic pump 1 and the control valve 3, while filters 38 and 39 are provided in the openings 13 and 14 of the valve body 10, respectively. ing. That is, one filter 38 on the valve body 10 side is provided in the opening 13 of the valve body 10, and the other filter 39 is also provided in the opening 14.
[0028]
Each of the filters 38 and 39 includes a filter body 41 and a frame body 42 provided on the outer peripheral side of the filter body 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.
[0029]
Each of the filters 38 and 39 has a hook portion 43 formed on one end side and a hook locking portion 44 formed on the other end side. Further, a plurality of axial crosspieces 45 are formed so as to have a substantially C-shaped inner peripheral side, and one of the crosspieces 45 is formed at an end portion, and a hook locking portion 44 (see FIG. 3 ).
[0030]
Each of the filters 38 and 39 is attached to the valve body 10, more specifically, in the circumferential grooves 23 and 24 of the valve body 10, and when attached to the valve body 10, By engaging the hook portion 43, the whole is substantially annular. The filters 38 and 39 are mounted in the circumferential grooves 23 and 24 of the valve body 10 so that they are correctly positioned in the axial direction of the valve body 10 and are correctly arranged with respect to the openings 13 and 14 of the valve body 10. The
[0031]
In addition, since each of the filters 38 and 39 is formed in a substantially C shape in a free state, in the state where the hook portion 43 is locked to the hook locking portion 44 and the ring portion is substantially annular, As a result, a tensile force acts on the hook locking portion 44, and a firm locking is achieved.
[0032]
Next, the operation of the valve timing changing device having such a configuration will be described.
First, when a control current is not supplied to the electromagnetic solenoid 29 from a control device and a power source (not shown) (non-energized state), the spool valve 11 is urged leftward in FIG. 2 by the spring force of the spring member 28. The spool valve 28 is stopped at a predetermined position.
[0034]
In the non-energized state, the land portion 30 of the spool valve 11 opens the opening portion 13 of the valve body 10 at a predetermined area on the opening portion 12 side, and the land portion 31 opens the opening portion 14 on the opening portion 15 side at a predetermined area. ing. For this reason, the hydraulic fluid guided from the hydraulic pump 1 to the inside of the valve body 10 through the supply passage 4 and the opening 12 is guided to the valve timing changing device 2 through 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.
[0035]
Accordingly, the valve timing changing device 2 performs a predetermined operation, and for example, the camshaft 6 is controlled in the advance direction with respect to the sprocket 5.
[0036]
Next, when a control current is supplied to the electromagnetic solenoid 29 (energized state), the spool valve 11 is driven.
[0037]
The spool valve 11 is driven by the electromagnetic solenoid 29, and the spool valve 11 moves rightward in FIGS . 1 and 2 , whereby the land portion 30 of the spool valve 11 opens the opening 13 of the valve body 10. A predetermined area is opened on the 15 side, and the land portion 31 opens the opening 14 on the opening 12 side with a predetermined area. For this reason, the hydraulic fluid guided from the hydraulic pump 1 to the inside of the valve body 10 through the supply passage 4 and the opening 12 is guided to the valve timing changing device 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.
[0038]
Accordingly, the valve timing changing device 2 performs a predetermined operation, and, for example, the camshaft 6 is controlled in the retarding direction with respect to the sprocket 5.
[0039]
Here, the hydraulic oil guided from the hydraulic pump 1 to the valve timing changing device 2 via the control valve 3 is filtered by a filter 37 provided between the hydraulic pump 1 and the control valve 3 and is also controlled by the control valve. The filter 38 or the filter 39 provided in 3 is filtered twice.
[0040]
The hydraulic oil discharged from the valve timing changing device 2 through the control valve 3 is filtered by the filter 38 or the filter 39 provided in the control valve 3. In other words, the hydraulic oil traveling from the valve timing changing device 2 to the control valve 3 is filtered by one of the filters 38 and 39.
[0041]
As a result, foreign matter mixed in the hydraulic oil due to wear of the valve timing changing device 2 or the like is removed by the filter 38 or the filter 39 and is prevented from entering the control valve 3.
[0042]
For this reason, only clean hydraulic fluid is introduced into the control valve 3, so that the control valve 3 operates smoothly.
[0043]
Therefore, it is possible to obtain a hydraulic apparatus that can advantageously prevent the malfunction of the control valve 3 due to the foreign matter in the hydraulic oil.
[0044]
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 attached in comparison with the case where the filters 38 and 39 are provided in the intake and exhaust passages 8 and 9. It becomes easy, and the working oil over the whole range of the intake / exhaust passages 8 and 9 between the valve timing changing device 2 and the control valve 3 becomes the object of filtration and is effectively filtered.
[0045]
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.
[0046]
Further, each of the filters 38 and 39 is formed of a filter body 41 and a frame body 42 provided on the outer peripheral side of the filter body 41, so that it is easy to handle and easy to attach. .
[0047]
Further, since the control valve 3 is provided with the filters 38 and 39, the hydraulic oil is filtered by the filters 38 and 39, and the change in the rotational phase due to the reverse torque acting on the camshaft 6 is reduced as much as possible. be able to.
[0048]
That is, the valve timing changing device 2 generates a pulse pressure inside by the reverse torque acting on the camshaft 6, and the pulse pressure of the hydraulic oil acts on the control valve 3 and may 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 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.
[0049]
5 and 6 show a second embodiment of the present invention. This embodiment is different from the above embodiment in that a filter 37 provided between the hydraulic pump 1 and the control valve, and valve timing are shown. Filters 38 and 39 provided between the change device 2 and the control valve 3 are provided at the openings 12, 13 and 14 of the valve body 10, respectively.
[0050]
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.
[0051]
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.
[0052]
The filter 37 is configured similarly to the filters 38 and 39 described in the above embodiment. That is, the filters 37, 38 and 39 are used as common parts. Even in such a configuration, the same operation and effect as the above-described embodiment can be obtained.
[0053]
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.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a hydraulic apparatus showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the control valve shown in FIG.
3 is a drawing showing the free state of the filter shown in FIG. 2 as a front view (a) and an enlarged arrow view (b) in the direction of arrow B of the front view (a).
FIG. 4 is a front view (a) and an enlarged view (b) of a portion B of the front view (a), showing a state where the filter shown in FIG. 1 is mounted.
FIG. 5 is an explanatory diagram of a hydraulic apparatus showing a second embodiment of the present invention.
6 is a cross-sectional view of the control valve shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Hydraulic source 2 ... Valve timing change apparatus 3 ... Control valve 10 ... Valve body 11 ... Spool valve 12, 13, 14 ... Opening part 37, 38, 39 ... Filter

Claims (2)

A hydraulic source;
And Bal pig timing changing device for changing the opening and closing timing of the intake valve or exhaust valve by hydraulic oil supplied from the hydraulic source,
A control valve that is disposed between the hydraulic source and the valve timing changing device, and controls supply of hydraulic oil from the hydraulic source to the valve timing changing device and discharge of hydraulic fluid from the valve timing changing device;
A filter that filters hydraulic oil from the valve timing changing device toward the control valve ,
The control valve has a cylindrical valve body having an opening communicating with a hydraulic pressure source and an opening communicating with the valve timing changing device, and is slidably accommodated in the valve body. The opening of the valve body A spool valve that can be opened and closed,
The filter is provided in the opening communicating with the valve timing changing device of the valve body, and provides a resistance for attenuating the pulse pressure of the hydraulic oil generated by the valve timing changing device, and the filter The hydraulic system is characterized by comprising a frame provided on the outer peripheral side, a hook portion formed on one end side, and a hook locking portion for locking to the hook portion formed on the other end side. apparatus. The filter is formed in a substantially C shape in a natural state, a plurality of crosspiece members are formed along the axial direction on the inner peripheral side, and one of the crosspiece members formed at the end portion is the hook locking portion. The hydraulic apparatus according to claim 1, wherein the hydraulic apparatus is formed as follows .

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