JP2009079543A - Fixing structure for solenoid valve unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply and firmly fix a filter for removing dust from hydraulic oil to an engine body, and to improve assembling work efficiency. <P>SOLUTION: A valve unit 34 having first and second control valves 54, 56 contains a supply passage 68 to which hydraulic oil is supplied, first and second lead-side passages 72, 76 through which the hydraulic oil flows during the changeover action of the first and second control valves 54, 56, and first and second lag-side passages 74, 78; wherein a filter 58 is held between the end face facing the supply passage 68 and the side face of a cylinder head 28 to which the valve unit 34 is attached, thereby removing foreign substances and the like from the hydraulic oil. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a structure for fixing an electromagnetic valve unit including an electromagnetic valve used in a variable valve timing mechanism capable of controlling the opening / closing timing of intake and exhaust valves constituting an engine.

  2. Description of the Related Art Conventionally, there is known a variable valve timing mechanism that changes the rotation phase of a camshaft relative to the rotation of a crankshaft and changes the opening / closing timing of an intake / exhaust valve to improve engine output and fuel efficiency. This variable valve timing mechanism generally has an actuator that changes the rotational phase of the camshaft relative to the rotation of the crankshaft, and an oil control valve that controls the supply and discharge of the hydraulic fluid of the actuator according to the operating state of the engine. .

  The actuator and the oil control valve are communicated with each other through the advance side oil passage and the retard side oil passage, and the working oil is circulated through the advance side oil passage under the switching action of the oil control valve. The actuator is actuated to the advance side, while the operating oil is circulated through the retard side oil passage to actuate the actuator to the retard side to change the valve opening / closing timing.

  In addition, holes facing the advance side oil passage and the retard side oil passage are opened in the side portions of the chain case, respectively, and a bottomed cylindrical oil filter is fitted into each of the holes. An oil control valve is installed to cover the hole. And the foreign material in hydraulic fluid between an oil control valve and an actuator is removed by the oil filter provided in the downstream of the oil control valve (for example, refer to patent documents 1).

JP 2001-214723 A

  By the way, in the prior art which concerns on patent document 1, after fitting an oil filter in the hole opened to the chain case, it has mounted | worn so that an oil control valve may be covered. Therefore, when replacing the oil filter, it is necessary to remove the chain case from the engine body, or to remove the oil control valve, and then work in a limited space in the engine room. As a result, there is a problem that the oil filter replacement work is complicated and its maintainability is poor.

  The present invention has been made in consideration of the above-mentioned problems, and can easily and firmly fix a filter for removing dust contained in hydraulic oil and improve its assembling workability. An object of the present invention is to provide a fixing structure for an electromagnetic valve unit.

In order to achieve the above-described object, the present invention provides an electromagnetic that controls a supply state of hydraulic oil to a variable valve timing mechanism that is mounted on an engine body and can freely change the opening / closing timing of intake and exhaust valves provided in the engine body. In a solenoid valve unit having a valve,
A housing which is fixed to the engine body, the hydraulic oil is supplied to the inside, and the electromagnetic valve is held;
A filter provided in the housing and capable of removing foreign substances contained in the hydraulic oil;
With
The filter is sandwiched between the housing and the engine body.

  According to the present invention, in the housing constituting the electromagnetic valve unit, when a filter capable of removing foreign substances contained in the hydraulic oil supplied to the variable valve timing mechanism is provided and the housing is mounted on the engine body, The filter is sandwiched between the housing and the engine body.

  Therefore, when fixing the housing provided with the electromagnetic valve to the engine body, the filter can be fixed easily and firmly, and foreign matter and the like in the hydraulic oil using the filter can be reliably removed. In addition, the assembly workability can be improved.

  In addition, the housing includes a fitting portion that faces the engine body and fits the filter, so that the filter remains attached to the fitting portion of the housing when the housing is detached from the engine body. Since it is detached in a state, it is possible to prevent the filter from falling off and improve workability.

  Furthermore, by disposing the filter at least upstream of the solenoid valve provided in the housing, foreign matter contained in the hydraulic oil does not reach the solenoid valve, and foreign matter and the like enter the solenoid valve. It is possible to reliably prevent the occurrence of defects.

  Furthermore, the housing branches from the supply passage through which the hydraulic oil is supplied from the engine main body, and branches from the supply passage, and guides the hydraulic oil to the engine main body through a valve passage provided with an electromagnetic valve. By providing the passage, it is possible to easily form the branch passage with respect to the housing by machining as compared with the case where the branch passage is provided in the engine body. Therefore, it becomes possible to reduce the manufacturing process and manufacturing cost of the engine including the electromagnetic valve unit.

  Furthermore, since the housing is provided separately from the cover member that covers the side portion of the engine body, the housing can be attached and detached without removing the cover member. For this reason, it is possible to efficiently perform the attaching / detaching operation of the solenoid valve unit including the housing.

  Further, since the housing is fastened together with the engine body via the cover member and fixed, the fixing portion for fixing the housing can be made common with the cover member. As a result, the housing can be fixed at the same time when the cover member is assembled, so that the assembly workability can be improved.

  According to the present invention, the following effects can be obtained.

  That is, when a filter capable of removing foreign matters or the like in the hydraulic oil supplied to the variable valve timing mechanism is provided in the housing of the solenoid valve unit, and when the housing is attached to the engine body, the filter is attached to the housing and the engine body. The filter can be easily and firmly fixed by being sandwiched between them, and foreign matter and the like in the hydraulic oil can be reliably removed using the filter, and the assembling workability is improved. be able to.

  A preferred embodiment of a fixing structure for an electromagnetic valve unit according to the present invention will be described in detail below with reference to the accompanying drawings.

  In FIG. 1, reference numeral 10 indicates an engine to which a fixing structure for a solenoid valve unit according to an embodiment of the present invention is applied.

  As shown in FIG. 1, the engine 10 is mounted in an engine room of a vehicle (not shown). A piston 16 is connected to a crankshaft 12 constituting the engine 10 via a connecting rod 14. Timing between the sprocket 18 provided at one end of the crankshaft 12 and the cam sprockets 24 a and 24 b provided on the intake camshaft 20 and the exhaust camshaft 22 disposed in parallel above the crankshaft 12. The chain 26 is wound. The sprocket 18, the cam sprockets 24a and 24b, and the timing chain 26 are covered with a chain cover (cover member) 32 (see FIG. 2) that is mounted on the side surfaces of the cylinder head 28 and the cylinder block 30.

  Here, in the engine room, the crankshaft 12 is mounted horizontally so that the crankshaft 12 is substantially orthogonal to the traveling direction of the vehicle and the end portions thereof are on the side frames provided on the left and right sides in the engine room. The case of this four-cylinder engine will be described.

  A variable valve timing mechanism capable of changing the relative phases of the intake camshaft 20 and the exhaust camshaft 22 and changing the opening / closing timing of the intake valve 33a and the exhaust valve 33b is formed on the side surface of the cylinder head 28 constituting the engine 10. A valve unit (solenoid valve unit) 34 is mounted.

  As shown in FIG. 2, the side surface of the cylinder head 28 includes a mounting portion 36 to which the valve unit 34 is mounted. The mounting portion 36 is provided with a supply oil path 38 through which hydraulic oil is supplied, and variable. First and second oil passages 40 and 42 for supplying hydraulic oil to a variable valve timing mechanism (not shown) of the valve timing mechanism are formed.

  The first oil passage 40 communicates with a variable valve timing mechanism provided on the intake camshaft 20 side, and includes an advance passage 44a for advancing the intake camshaft 20 and a retard passage 46a for retarding. Composed. The second oil passage 42 communicates with a variable valve timing mechanism provided on the exhaust camshaft 22 side, and, similarly to the first oil passage 40, an advance passage 44b for advancing the exhaust camshaft 22. And a retard passage 46b for retarding the angle. The mounting portion 36 is provided with a plurality of screw holes 48 into which a fixing bolt 86 for fixing the valve unit 34 is screwed.

  As shown in FIGS. 2 to 7, the valve unit 34 is mounted on the side surface of the cylinder head 28 through a unit hole 50 opened on the side surface of the chain cover 32, and is fixed to the cylinder head 28. A pair of first and second control valves (solenoid valves) 54 and 56 held with respect to the housing 52 and a filter 58 mounted on the side surface of the housing 52 and held between the cylinder head 28. It consists of.

  The housing 52 is formed in a block shape having a substantially rectangular cross section, and is mounted so that one end of the opening is in contact with the cylinder head 28. First and second valve holes (valve passages) 60 and 62 into which a part of the first and second control valves 54 and 56 are inserted are opened on both side surfaces of the housing 52, respectively. The first and second valve holes 60, 62 extend in the horizontal direction toward the inside of the housing 52, and are formed in parallel to each other with a predetermined interval in the vertical direction.

  An annular groove 64 (see FIGS. 6 and 7) is formed on an end surface of the housing 52 that is in contact with the cylinder head 28, and a seal member 66 is attached to the groove 64. The seal member 66 is made of, for example, an O-ring, liquid packing, and the like. When the valve unit 34 including the housing 52 is mounted on the side surface of the cylinder head 28, the seal member 66 is interposed between the housing 52 and the cylinder head 28. Sandwiched between. As a result, the hydraulic oil introduced into the valve unit 34 is prevented from leaking to the outside, and liquid tightness is maintained.

  On the other hand, inside the housing 52, a supply passage 68 for supplying hydraulic oil from the engine 10, communication passages 70 a and 70 b communicating the first and second valve holes 60 and 62 and the supply passage 68, A first advance side passage (branch passage) 72 and a first retard side passage (branch passage) 74 that communicate with the first valve hole 60 and that switch the flow state of the hydraulic oil under the switching action of the first control valve 54. And a second advance side passage (branch passage) 76 and a second retard side passage (branch) that are communicated with the second valve hole 62 and that switch the operating state of the hydraulic oil under the switching action of the second control valve 56. A passage) 78, a first drain hole 80 through which the hydraulic oil is discharged through the first valve hole 60, and a second drain hole 82 through which the hydraulic oil is discharged through the second valve hole 62.

  The supply passage 68 is opened to one end portion side of the housing 52 in a substantially rectangular shape, and is formed horizontally from one end portion side to the other end portion of the housing 52, and the communication passages 70a and 70b are provided in the housing 52. 52 communicates with the supply passage 68 on the other end side and extends vertically upward so as to be orthogonal to the supply passage 68.

  The communication passages 70 a and 70 b are formed by cutting or the like in the vertically downward direction from the upper side of the housing 52, and are formed so as to penetrate the first and second valve holes 60 and 62 and the supply passage 68. The hole opened at the top of the housing 52 is closed by a plug 83 formed in a substantially conical shape. As a result, the hydraulic fluid flowing through the communication passages 70a and 70b, the first and second valve holes 60 and 62, and the supply passage 68 does not leak to the outside through the opened hole.

  That is, the communication passages 70 a and 70 b penetrate perpendicularly to the first and second valve holes 60 and 62 formed on the other end portion side of the housing 52, and are supplied to the supply passage 68. Is supplied to the first and second valve holes 60 and 62 through the communication passages 70a and 70b.

  A recess (fitting portion) 68a (see FIG. 7) having a slightly enlarged diameter is formed at the opening end of the supply passage 68, and a mesh portion 112 of a filter 58 described later is fitted therein. An annular groove 116 that is recessed in a rectangular shape is formed on the end face facing the passage 68, and the seal part 114 of the filter 58 is attached to the groove 116.

  The first advance side passage 72 and the first retard side passage 74 are provided above the supply passage 68 in parallel with a predetermined distance from each other, from one end side of the opened housing 52 toward the other end side. It is extended. One end portions of the first advance side passage 72 and the first retard side passage 74 are connected to the advance passage 44a and the retard passage 46a that constitute the first oil passage 40 of the cylinder head 28, respectively. At the same time, the other end portions are respectively connected to and communicated with the first valve hole 60.

  Further, the second advance angle side passage 76 and the second retard angle side passage 78 are provided above the first advance angle side passage 72 and the first retard angle side passage 74 in parallel with a predetermined distance from each other and opened. The housing 52 extends from one end side toward the other end side. One end portions of the second advance side passage 76 and the second retard side passage 78 are connected to the advance passage 44b and the retard passage 46b that constitute the second oil passage 42 of the cylinder head 28, respectively. At the same time, the other ends are connected to and communicate with the second valve holes 62 (see FIG. 7).

  That is, the first advance side passage 72, the first retard side passage 74, the second advance side passage 76, and the second retard side passage 78 are respectively arranged in a lattice shape spaced apart from each other by a predetermined distance. A second retard side passage 78 is provided above the corner side passage 72, and a second advance side passage 76 is provided above the first retard side passage 74.

  In other words, the first and second advance side passages 72 and 76 and the first and second retard side passages 74 and 78 are arranged inside the housing 52 so as to intersect each other.

  The housing 52 has a pair of ribs 52a and 52b extending in the vertical direction above the supply passage 68. One rib 52a includes a first advance side passage 72 and a second retard angle. A side passage 78 is provided, and a first retard side passage 74 and a second advance side passage 76 are provided on the other rib 52b. As shown in FIGS. 3 and 5, the pair of ribs 52 a and 52 b are provided in parallel with a predetermined distance from each other, and connect the upper portion of the supply passage 68 and the inner wall surface of the housing 52.

  Thus, by providing a pair of ribs 52a and 52b in which the first advance side passage 72, the first retard side passage 74, the second advance side passage 76, and the second retard side passage 78 are formed. The rigidity of the housing 52 opened toward the cylinder head 28 using the ribs 52a and 52b can be improved, and the upper ends of the ribs 52a and 52b are joined in the vicinity of the mounting flange 85. Therefore, the mounting rigidity of the mounting flange 85 can be improved.

  The first drain hole 80 is formed at the other end of the housing 52, communicates with the first valve hole 60, and has 1 on each side around the first advance side passage 72 and the first retard side passage 74. It is provided one by one. Similar to the first drain hole 80, the second drain hole 82 is formed at the other end of the housing 52, communicates with the second valve hole 62, and has a second advance side passage 76 and a second retard side passage. One is provided on each side of 78. That is, the first drain hole 80 and the second drain hole 82 are formed in the other end portion of the housing 52 with the same number with a predetermined distance in the vertical direction.

  Then, excess hydraulic oil in the variable valve timing mechanism is discharged from the first and second valve holes 60 and 62 to the drain chamber 84 formed in the housing 52 through the first and second drain holes 80 and 82. Then, the oil is discharged to an oil pan (not shown) of the engine 10 through a drain oil passage 87 (see FIG. 2) provided in the cylinder head 28.

  On the other hand, a plurality of mounting flanges 85 are provided outside the housing 52. A fixing bolt 86 is inserted into a hole formed in the mounting flange 85 and screwed into the screw hole 48 of the cylinder head 28. A valve unit 34 including a housing 52 is fixed to the cylinder head 28.

  As shown in FIGS. 8 and 9, the first control valve 54 is fixed to the cylindrical sleeve 88a, a spool 90a slidably fitted into the sleeve 88a, and the sleeve 88a. A solenoid portion 92a that displaces the spool 90a in the axial direction (in the direction of arrow A in FIG. 8) under the action, and the spool 90a is attached toward the solenoid portion 92a (in the direction of arrow B in FIG. 8). And a spring 94a.

  The second control valve 56 is formed in the same shape as the first control valve 54, and is fixed to the cylindrical sleeve 88b, a spool 90b slidably fitted inside the sleeve 88b, and the sleeve 88b. A solenoid portion 92b that displaces the spool 90b in the axial direction (in the direction of arrow A in FIG. 8) under energization, and the spool 90b toward the solenoid portion 92b (in the direction of arrow B in FIG. 8). And an urging spring 94b.

  In the first and second control valves 54 and 56, the solenoid portions 92a and 92b are respectively excited based on a control signal from a controller (not shown), and the spools 90a and 90b are separated from the solenoid portions 92a and 92b (see FIG. 8, the spools 90 a and 90 b are displaced along the axial direction against the resilient force of the springs 94 a and 94 b.

  The sleeves 88a and 88b include inflow ports 96a and 96b disposed in the center along the axial direction, and advance ports 98a and 98b and retard ports 100a and 100b provided on both sides of the inflow ports 96a and 96b. And a pair of drain ports 102a and 102b provided on both sides of the advance ports 98a and 98b and the retard ports 100a and 100b around the inflow ports 96a and 96b. The inflow ports 96a and 96b, the advance ports 98a and 98b, the retard ports 100a and 100b, and the drain ports 102a and 102b are provided at predetermined intervals along the axial direction of the sleeves 88a and 88b.

  On the other hand, the spools 90a and 90b include central grooves 104a and 104b formed at the center along the axial direction, a pair of land portions 106a and 106b adjacent to both sides of the central grooves 104a and 104b, and the land portions 106a. , 106b and a pair of grooves 108a, 108b formed on both sides. The central grooves 104a and 104b and the grooves 108a and 108b are recessed annularly at a predetermined depth with respect to the outer peripheral surfaces of the land portions 106a and 106b.

  The sleeve 88a and the spool 90a constituting the first control valve 54 are inserted into the first valve hole 60 of the housing 52, and the rotational phase of the intake camshaft 20 is changed under the switching action of the first control valve 54. The first control valve 54 is fixed via a bolt 111 inserted into the hole of the bracket 110a in a state where the end of the solenoid 92a is in contact with the side surface of the housing 52.

  Similarly, the sleeve 88b and the spool 90b constituting the second control valve 56 are inserted into the second valve hole 62 of the housing 52, and the rotational phase of the exhaust camshaft 22 is changed under the switching action of the second control valve 56. Is done. The second control valve 56 is fixed via a bolt 111 inserted through the hole of the bracket 110b in a state where the end of the solenoid 92b is in contact with the side surface of the housing 52.

  That is, the first and second control valves 54 and 56 are mounted so that the sleeves 88 a and 88 b and the spools 90 a and 90 b are alternately arranged with respect to the housing 52.

  The filter 58 is formed in a substantially rectangular cross section corresponding to the opening of the supply passage 68 and has a mesh portion 112 formed in a mesh shape, and a seal portion 114 provided so as to surround the outer peripheral side of the mesh portion 112. Including. The mesh portion 112 is formed in a sheet shape having a plurality of holes, and the seal portion 114 is formed of an O-ring integrally held on the outer edge portion of the mesh portion 112. The filter 58 is disposed so that the mesh portion 112 faces the supply passage 68, is fitted into the recess 68 a of the supply passage 68, and the seal portion 114 is provided at the opening of the supply passage 68. When mounted on the groove 116 and the valve unit 34 is mounted on the side surface of the cylinder head 28, it is sandwiched between the one end surface of the housing 52 and the side surface without rattling. In this case, the filter 58 is sandwiched between the cylinder head 28 and the housing 52 in close contact with each other without a gap. As a result, the liquid tightness between the supply passage 68 and the supply oil passage 38 is maintained, and the hydraulic oil supplied from the supply oil passage 38 does not leak.

  The engine 10 to which the electromagnetic valve unit fixing structure according to the embodiment of the present invention is applied is basically configured as described above. Next, the operation and effects thereof will be described.

  First, an operation when the opening / closing timing of the intake valve 33a is shifted to the advance side will be described with reference to FIG. When the opening / closing timing of the intake valve 33a is shifted to the advance side, the solenoid portion 92a of the first control valve 54 is driven based on a control signal from a controller (not shown), and the spool of the first control valve 54 is driven. By moving 90a from the intermediate position in a direction away from the solenoid 92a (in the direction of arrow C1), the inflow port 96a and the advance port 98a of the first control valve 54 are communicated with each other, and the drain The port 102a communicates with the retard port 100a.

  As a result, hydraulic oil is supplied to the supply oil passage 38 of the cylinder head 28 by the oil pump mounted on the engine 10, and the hydraulic oil passes through the filter 58 to the supply passage 68 and the communication passage 70 a of the valve unit 34. It flows and is supplied to the inflow port 96a. Then, after this hydraulic oil flows from the communicating inflow port 96a to the first advance side passage 72, the advance passage for the first oil passage 40 formed in the cylinder head 28 shown in FIG. After passing through 44a, it flows into an advance side hydraulic chamber (not shown) formed in the actuator of the variable valve timing mechanism.

  At this time, the hydraulic oil in the retard side hydraulic chamber of the actuator flows to the retard passage 46a of the first oil passage 40 and the retard port 100a of the first control valve 54, and then from the drain port 102a to the first drain. The oil is discharged to the drain oil passage 87 of the cylinder head 28 through the hole 80.

  Next, when the opening / closing timing of the intake valve 33a is shifted to the retard side, the solenoid portion 92a of the first control valve 54 is deenergized based on a control signal from a controller (not shown), and the spring 94a is released. Under the action, the spool 90a of the first control valve 54 is moved from the intermediate position toward the solenoid portion 92a (in the direction of arrow C2). As a result, the inflow port 96a and the retard port 100a communicate with each other, and the drain port 102a and the advance port 98a communicate with each other. Then, after the hydraulic fluid supplied from the supply passage 68 to the inflow port 96a through the communication passage 70a flows to the first advance side passage 72, the first oil formed in the cylinder head 28 shown in FIG. It flows into a retarded hydraulic chamber (not shown) formed in the actuator of the variable valve timing mechanism through the retarded passage 46a of the path 40.

  At this time, after the hydraulic oil in the advance side hydraulic chamber (not shown) of the actuator flows to the advance passage 44a of the first oil passage 40 and the advance port 98a of the first control valve 54, the drain port The oil is discharged from 102 a through the first drain hole 80 to the drain oil passage 87 of the cylinder head 28.

  The rotational phase of the intake camshaft 20 is shifted to the advance side or the retard side by the hydraulic oil introduced into the advance side hydraulic chamber or the retard side hydraulic chamber of the actuator, and is passed through the intake cam shaft 20. The opening / closing timing of the intake valve 33a is changed.

  Thus, the filter 58 is provided so as to face the supply oil passage 38 and the supply passage 68 when the hydraulic oil is supplied from the supply oil passage 38 of the cylinder head 28 to the supply passage 68 of the valve unit 34. Therefore, the foreign matter in the hydraulic oil is surely removed by the mesh portion 112 of the filter 58. That is, foreign matter is prevented from entering the valve unit 34 having the first and second control valves 54 and 56. In other words, foreign matters and the like can be removed on the upstream side of the first and second control valves 54 and 56.

  On the other hand, the action when the opening / closing timing of the exhaust valve 33b is shifted to the advance side or the retard side is substantially the same as the case where the opening / closing timing of the intake valve 33a is shifted to the advance side or the retard side. Instead of driving the first control valve 54 when changing the opening / closing timing of the intake valve 33a, the second control valve 56 is driven, and an inflow port 96b to which hydraulic oil is supplied and an advance port 98b or a retard port The state of communication with 100b is switched, and the hydraulic oil is supplied to an advance-side hydraulic chamber or a retard-side hydraulic chamber (not shown) formed in the actuator of the variable valve timing mechanism. Thereby, the rotational phase of the exhaust camshaft 22 may be shifted to the advance side or the retard side, and the opening / closing timing of the exhaust valve 33b may be changed. Note that the detailed description of the case where the opening / closing timing of the exhaust valve 33b is shifted to the advance side or the retard side is omitted.

  In the above description, the case where the filter 58 is provided at the opening end of the supply passage 68 on the upstream side of the first and second control valves 54, 56 has been described. However, the present invention is not limited to this. In addition to the filter 58, another filter may be provided, for example, in the opening of the first and second advance side passages 72 and 76, the first and second retard side passages 74 and 78, or The filter 58 may integrally cover the supply passage 68, the first and second advance side passages 72 and 76, and the first and second retard side passages 74 and 78.

  In this case, foreign matter and the like can be removed not only on the upstream side of the first and second control valves 54 and 56 but also on the downstream side, so that the foreign matter and the like in the hydraulic oil can be more reliably removed. In addition, the single filter 58 can remove foreign matters on the upstream and downstream sides of the first and second control valves 54 and 56, thereby reducing the number of parts compared to the case where two filters are provided. Therefore, it is possible to reduce the manufacturing cost and the assembly man-hour with the reduction of the number of parts.

  The valve unit 34 is not limited to be directly fixed to the side surface of the cylinder head 28. For example, the valve unit 34 is fixed to the cylinder head 28 together with the chain cover 32 to be integrally fixed. May be. In this case, since the fixed part of the housing 52 can be shared with the chain cover 32, the limited space on the side surface of the engine 10 can be used efficiently, and when the chain cover 32 is assembled. Moreover, since the housing 52 can be fixed at the same time, the assembling workability can be improved. Further, since the housing 52 is disposed at a substantially central portion in the left-right direction between the intake camshaft 20 and the exhaust camshaft 22 in the chain cover 32, the chain cover 32 is shared with the cylinder head 28 together with the housing 52. By tightening, the center portion of the chain cover 32 can be fixed to the cylinder head 28, so that vibration of the chain cover 32 can be reduced.

  As described above, in the present embodiment, in the housing 52 constituting the valve unit 34, the filter 58 capable of removing foreign matters and the like in the hydraulic oil is provided at the end of the supply passage 68 to which the hydraulic oil is supplied. When the valve unit 34 is fixed to the side surface of the cylinder head 28 constituting the engine 10, the filter 58 is sandwiched between the housing 52 and the cylinder head 28. As a result, the valve unit 34 having the first and second control valves 54 and 56 can be used, and the filter 58 can be simply and firmly fixed between the cylinder head 28 and the operation using the filter 58. It is possible to reliably remove foreign matters in the oil.

  Further, since the housing 52 fixing the filter 58 is only fixed to the side surface of the cylinder head 28 with fixing bolts 86, the removal work of the filter 58 is simplified by removing the housing 52. And can be performed efficiently.

  Further, since the filter 58 faces the supply passage 68 and is fitted in a recess 68 a provided on one end surface of the housing 52, the filter 58 can be removed even when the housing 52 is detached from the side surface of the cylinder head 28. It remains in the state where it is mounted on the housing 52, and its drop-out is prevented. As a result, it is possible to improve workability when performing the detaching operation of the valve unit 34.

  Furthermore, since the valve unit 34 is directly fixed to the cylinder head 28 through the unit hole 50 provided in the chain cover 32 that covers the side surface of the cylinder head 28, when the valve unit 34 is attached or detached, It is not necessary to remove the chain cover 32, and maintenance work can be performed efficiently.

  In addition, since the filter 58 can be disposed upstream of the first and second control valves 54 and 56 in the valve unit 34, foreign substances contained in the hydraulic oil are prevented from being contained in the first and second control valves. It is possible to capture reliably before reaching 54,56. As a result, entry of foreign matter or the like into the first and second control valves 54 and 56 is blocked and reliably protected, and the occurrence of malfunctions can be prevented.

  Further, conventionally, a filter unit having a filter separately from the valve unit is provided in the cylinder head, and the hydraulic oil circulated through the filter unit is guided to the valve unit and then supplied to the variable valve timing mechanism. In this case, it is necessary to separately provide an oil passage for supplying hydraulic oil to the filter unit side and circulating it to the valve unit side inside the cylinder head.

  On the other hand, in the present embodiment, the valve unit 34 that switches the supply state of the hydraulic oil to the variable valve timing mechanism is used, and the filter 58 is built in and integrated with the valve unit 34. The oil path up to the filter unit provided in the conventional cylinder head is no longer necessary, and the processing process of this oil path can be abolished, and there is no need to provide a separate filter fixing structure. Can be reduced.

  Furthermore, the housing 52 is provided with first and second advance side passages 72, 76 capable of supplying hydraulic oil to the advance passages 44a, 44b of the cylinder head 28, and the retard passage 46a, 46b can be provided with first and second retarded-side passages 74 and 78 that can supply hydraulic oil to the cylinder 46b. It can be easily processed. As a result, the manufacturing process and manufacturing cost of the engine 10 including the valve unit 34 can be reduced.

  Furthermore, although the hydraulic oil is discharged from the oil pump and supplied to the valve unit 34, the supplied hydraulic oil pulsates due to the characteristics of the pump. Even in this case, the pulsation can be reduced by providing the filter 58 between the supply oil passage 38 and the supply passage 68 and allowing the hydraulic oil to pass through the filter 58.

  Further, the supply oil passage 38 and the supply passage 68 in the vicinity of the filter 58 are formed to have a larger cross-sectional area than other oil passages and passages through which hydraulic oil flows. Therefore, the chamber effect is obtained, and the pulsation of the hydraulic oil is suitably reduced by flowing through the supply oil passage 38 and the supply passage 68.

  Further, in the above-described embodiment, the configuration in which the housing 52 constituting the valve unit 34 is provided separately from the chain cover 32 has been described. However, the housing may be provided integrally with the chain cover 32. Good.

  The structure for fixing the electromagnetic valve unit according to the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

It is a schematic block diagram of an engine provided with the valve unit to which the fixing structure of the electromagnetic valve unit which concerns on embodiment of this invention was applied. FIG. 2 is an enlarged exploded perspective view showing a state where the valve unit of FIG. 1 is detached from a cylinder head. It is the single-piece | unit perspective view seen from the one end part side which opened the valve unit in FIG. FIG. 4 is an exploded perspective view of the valve unit shown in FIG. 3. It is a front view of the valve unit shown in FIG. FIG. 4 is a half sectional perspective view of a housing constituting the valve unit of FIG. 3. It is sectional drawing along the VII-VII line of FIG. FIG. 4 is a longitudinal sectional view of first and second control valves shown in FIG. 3. FIG. 9 is an overall longitudinal sectional view of a valve unit showing a state in which the first and second control valves of FIG. 8 are mounted on a housing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Engine 20 ... Intake cam shaft 22 ... Exhaust cam shaft 24a, 24b ... Cam sprocket 28 ... Cylinder head 32 ... Chain cover 34 ... Valve unit 36 ... Mounting part 50 ... Unit hole 52 ... Housing 54 ... 1st control valve 56 ... Second control valve 58 ... Filter 60 ... First valve hole 62 ... Second valve hole 68 ... Supply passage 72 ... First advance angle side passage 74 ... First retard angle side passage 76 ... Second advance angle side passage 78 ... First 2 retard side passage 80 ... first drain hole 82 ... second drain holes 88a, 88b ... sleeves 90a, 90b ... spools 92a, 92b ... solenoid part 112 ... mesh part 114 ... seal part

Claims (6)

In an electromagnetic valve unit having an electromagnetic valve mounted on an engine body and controlling a supply state of hydraulic oil to a variable valve timing mechanism capable of changing an opening / closing timing of an intake / exhaust valve provided in the engine body.
A housing which is fixed to the engine body, the hydraulic oil is supplied to the inside, and the electromagnetic valve is held;
A filter provided in the housing and capable of removing foreign substances contained in the hydraulic oil;
With
The structure for fixing an electromagnetic valve unit, wherein the filter is sandwiched between the housing and the engine body. The fixing structure according to claim 1,
The structure for fixing an electromagnetic valve unit, wherein the housing has a fitting portion facing the engine body and into which the filter is fitted. The fixing structure according to claim 1 or 2,
The structure for fixing an electromagnetic valve unit, wherein the filter is disposed at least upstream of an electromagnetic valve provided in the housing. The fixing structure according to any one of claims 1 to 3,
The housing includes a supply passage through which the hydraulic oil is supplied from the engine body;
A branch passage that branches from the supply passage and guides the hydraulic oil to the engine body through a valve passage in which the electromagnetic valve is disposed;
A structure for fixing an electromagnetic valve unit, comprising: In the fixing structure according to any one of claims 1 to 4,
The structure for fixing an electromagnetic valve unit, wherein the housing is provided separately from a cover member that covers a side portion of the engine body. The fixing structure according to claim 5,
A structure for fixing an electromagnetic valve unit, wherein the housing is fixed together with the engine body via the cover member.

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