JPH08100611A - Attaching structure for cam phase angle varying device in engine - Google Patents

Abstract

PURPOSE: To facilitate the attaching work of a cam phase angle varying device by reducing the number of part items for attaching the whole of the above device in the attaching structure of the above device in a four-cycle engine. CONSTITUTION: In a four-cycle engine where the variable working section of a cam phase angle varying device which varies the phase angles of a cam shaft and of cam sprocket by the pressure of oil supplied from a solenoid valve 81 for controlling oil pressure through an oil transfer section 82 is attached at the front end of the cam shaft, the unit of the solenoid valve 81 and the oil transfer section 82 which are unitedly assembled is fixed to the front of the body of an engine 1 in front of the cam shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a four-cycle engine in which a cam phase angle varying device (VVT) is installed on an overhead camshaft, and more particularly to a mounting structure of the cam phase angle varying device in the engine.

[0002]

4 with a valve system of the OHC type
In a cycle engine, that is, in a 4-cycle engine in which a camshaft driven by a rotation of a crankshaft through a timing chain or the like is arranged above a cylinder, a substantially cylindrical shape in which a helical gear operated by hydraulic pressure is housed at the front end of the camshaft -Shaped casing is attached, and a cam sprocket that meshes with the timing chain is integrally provided on the rear end side of this casing, and the phase of the cam sprocket and the phase of the cam shaft itself are changed by hydraulic pressure to operate the engine. A cam phase angle varying device (VVT) in which the valve timing is changed according to the state is conventionally known.
(For example, see Japanese Utility Model Publication No. 6-12240)

[0003]

By the way, in the above-described conventionally known cam phase angle varying device, a cylinder mounted on the front end of the cam shaft to change the phase of the cam sprocket and the phase of the cam shaft itself by hydraulic pressure. When installing a solenoid valve for adjusting the hydraulic pressure of the oil to be fed into the cylindrical casing part (variable operating part), attach it to the engine body of the entire cam phase angle varying device including the solenoid valve. There is a problem that the structure becomes complicated, the number of parts increases, and the assembling work becomes troublesome, and the production cost deteriorates.

Further, by installing a solenoid valve on the engine body side, in addition to the oil passage for lubrication to the bearing that pivotally supports the journal portion of the camshaft, variable operation of the cam phase angle varying device from the solenoid valve is performed. It is necessary to provide an oil transfer section (oil passage from the solenoid valve to the variable actuating section) for supplying oil to the cylinder section within the cylinder head, which causes a problem that the number of machining steps of the cylinder head itself increases and the cost increases. .

An object of the present invention is to eliminate the inconvenience of the four-cycle engine having the conventional cam phase angle varying device as described above, and more specifically, four.
In a cycle engine, the number of parts for mounting the entire cam phase angle varying device can be reduced, and an object thereof is to provide a mounting structure of the cam phase angle varying device which can be easily mounted. Further, in the mounting structure of the cam phase angle varying device in such an engine, it is an object to reduce the oil passage formed in the cylinder head to reduce the cost.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the object, the present invention, as set forth in claim 1 above, goes from a solenoid valve for hydraulic control to an oil transfer section. In a 4-cycle engine in which the variable actuating part of the cam phase angle varying device that changes the phase angle between the camshaft and the cam sprocket by the oil pressure of the supplied oil is attached to the front end of the camshaft, a solenoid valve that is integrally assembled The oil transfer unit is fixed to the front surface of the engine body in front of the camshaft.

Further, in the mounting structure of the cam phase angle varying device for the engine according to the above-mentioned claim 1, as described in the above-mentioned claim 2, the front end wall of the cylinder head is tightened by bolting from above. An opening having a diameter through which the variable actuation portion of the cam phase angle varying device can pass is formed across the mounting bracket integrally fixed to the upper surface of the front end wall, and the oil transfer is performed through the opening. The unit of the solenoid valve and the oil transfer unit, which are integrally assembled so as to be connected to the variable actuating unit, is fixed to the front end wall of the cylinder head and the mounting bracket from the front. To do.

Further, in the mounting structure of the cam phase angle varying device for an engine according to claim 1 or 2, the solenoid valve is provided on the front surface of the front end wall of the cylinder head as described in claim 3. It is characterized in that an end of an oil passage formed in the cylinder head for supplying oil is opened.

Further, in the mounting structure of the cam phase angle varying device for an engine according to any one of the first to third aspects, as described in the fourth aspect, the cylinder head is connected to the oil passage on the cylinder block side. An oil passage for supplying oil to the solenoid valve and an oil passage for supplying oil for lubrication to the camshaft are branched from the middle of the oil passage formed inside the branched camshaft lubrication. A throttle portion is formed in the oil passage for use.

Further, in the mounting structure for the cam phase angle varying device in the engine according to any one of claims 1 to 4, as described in claim 5, the front of the front end wall of the cylinder head has a solenoid valve inside. It is characterized in that a drain hole for the oil supplied to is opened.

[0011]

[Operation] With the above configuration, the integrated solenoid valve and oil transfer unit unit is aligned with the position of the variable operation part and the oil transfer part of the cam phase angle varying device attached to the front end of the camshaft. Then, the entire cam phase angle varying device including the solenoid valve is installed to the engine body by a simple work of fixing the front face of the engine.

Further, according to the structure described in claim 2, the unit of the solenoid valve and the oil transfer unit is integrated through the opening formed by the front end wall of the cylinder head and the mounting bracket. The cam phase angle including the solenoid valve is fixed by fixing the position of the variable operating part of the cam phase angle variable device mounted on the front end of the camshaft and the oil transfer part, and then fixing them to the cylinder head and mounting bracket from the front of the engine. The entire variable device is installed with respect to the engine body.

In that case, only one mounting bracket is newly required for fixing the entire cam phase angle varying device including the solenoid valve to the engine body, and a component for mounting the entire device. The number of points is greatly reduced, and the mounting bracket fixes the cam phase angle varying device to the engine body with high rigidity.

Further, according to the above-mentioned structure, the solenoid valve and the oil transfer unit are simply fixed to the front surface of the engine, and the oil inlet of the solenoid valve is the oil in the cylinder head. Connected with the passage.

Further, according to the structure described in claim 4, the solenoid valve is not separately provided in the cylinder head as the oil passage for the solenoid valve and the oil passage for the camshaft lubrication as two systems. An appropriate amount of oil is supplied to each of the bearing portions of the camshaft and the camshaft, and the oil passage in the cylinder head is reduced.

Further, according to the structure described in claim 5, the solenoid valve is connected to the oil drain hole only by fixing the unit of the solenoid valve and the oil transfer portion to the front surface of the engine.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a mounting structure for a cam phase angle varying device in an engine of the present invention will be described below with reference to the drawings.

FIG. 1 shows a state in which a multi-cylinder four-cycle engine of a twin cam valve system with two upper and lower chains is viewed from the front (in the direction of the crankshaft axis). The engine body 1 has a cylinder head cover 2 and a cylinder from above. Head 3, cylinder block 4, and crankcase 5
And the oil pan 6 are connected to each other, and the front surfaces of the cylinder block 4 and the crankcase 5 are covered with a front cover 7. The engine body 1 has a crankcase 5 along the outside of the oil pan 6. An oil cooler 9 with a built-in filter is installed on the lower surface of the, and a cam phase angle varying device 8 is installed across the cylinder head cover 2 and the cylinder head 3.

Further, the water pump 1 is attached to the engine body 1 by the cylinder block 4 and the front cover 7.
0 is formed and accessories such as an alternator 11, a power steering pump 12 and an air conditioner compressor 13 arranged around the engine body 1 are attached, and a water pump 10 and each accessory 11, 12, 1 are attached.
Pulleys 18, 19, 20, and 21 are fixed to the ends of the input shafts 14, 15, 16, and 17 of the drive shaft 3, respectively.

A pulley 23 is also fixed to the end of the output shaft 22 extending from the crankshaft of the engine and protruding to the outside of the front cover 7.
And each pulley 18, 19, 20, 21 has an output shaft 22
In order to transmit the rotation of the water pump to the respective input shafts 14, 15, 16 and 17 of the water pump and each accessory, a single belt 24 is stretched over, and the belt 24 for driving the accessory is provided with a spring damper. A belt tensioner 25 including a unit 26, an arm portion 27, and a tensioner pulley 28 is arranged.

In the belt tensioner 25, one end of a spring damper unit 26 is swingably fixed to a crankcase 5 by a shaft 26a, and a center of an arm portion 27 is swung by an alternator support portion 4a of a cylinder block 4 by a pivot portion 29. The other end of the spring damper unit 26 and one end of the arm portion 27 are rotatably connected by a shaft 26b, and a tensioner pulley 28 is rotatably attached to the other end of the arm portion 27. The tensioner pulley 28 is constantly pressed against the belt 24 via the arm portion 27 by the extension force of the spring of the spring damper unit 26.

The belt tensioner 25 includes a pivot portion 29 and a tensioner pulley 2 as shown in FIG.
8 and between the pivot part 29 and the spring damper unit 26 so that the belt 24 and the arm part 27 cross each other, the pivot part 29 in the center of the arm part 27 is located inside the circulating belt 24, The portion 27 is located in front of the belt 24, and is arranged such that the center lines of the belt 24 and the spring damper unit 26 in the front-rear direction (axial direction of the crank) coincide with each other.

As a result, the belt tensioner 25 has a greater degree of freedom in arranging the belt tensioner 25 with respect to the engine as compared with a case where the pivot portion of the tensioner is located outside the circulating belt, and the belt tensioner 25 is arranged in a narrow space. And the arm portion 27
Is located in front of the belt 24, the engine can be made compact in the front-rear direction (axial direction of the crank), and the front-rear centerlines of the belt 24 and the spring damper unit 26 are aligned to match the arm portion. The weight of 27 and the rigidity can be improved.

Since the tensioner pulley 28 can be arranged near the center of the engine body 1 in the width direction (axis X of the cylinder shown in FIG. 2), it can be hung on the pulleys of the accessories arranged on the left and right of the engine body 1. Tension can be applied to the passed accessory drive belt 24 at an effective position, and the tensioner pulley 28 can be compactly arranged below the mount bracket 30.

Further, the engine body 1 has a mount bracket 30 for fixing the engine to the vehicle body so as to extend over both the cylinder head 3 and the cylinder block 4.
However, the mounting brackets 30, 32, and 33 are fixed by bolting. The mount bracket 30 is formed with a fixing portion 30a to the vehicle body, and the upper portion of the alternator 2 is fixed by fixing portions 34 by bolting. There is.

FIG. 2 is a schematic view of an engine installed at the upper part of the engine 1.
1 shows a state of arrangement of a cam chain for driving a valve system of a 5-valve twin cam (not shown) having 3 valves for intake and 2 valves for exhaust per cylinder with respect to the engine body 1.

The cam chain comprises an intake cam sprocket 4 fixed to the end of a cam shaft 38 for an intake valve.
1 and an upper chain 43 that meshes with an exhaust side cam sprocket 42 that is fixed to an end portion of an exhaust valve camshaft 39, and a lower chain 45 that meshes with an output side sprocket 44 that is fixed to an output shaft 22 of a crankshaft.
Each intermediate sprocket 4 fixed to the intermediate rotary shaft 46
The chains are linked via 7, 48 and are installed as a two-tiered chain.

The intermediate rotary shaft 46 is arranged offset to one side from the axis X of the cylinder located substantially in the center in the width direction of the engine, fixed rotatably to the cylinder head 3, and the intermediate rotary shaft 46. The upper chain 43 is stretched over the intermediate sprocket 47, the intake side cam sprocket 41, and the exhaust side cam sprocket 42 which are fixed to each other, and the lower stage chain 45 is stretched over the intermediate sprocket 48 and the crankshaft camshaft side output sprocket 44. Has been done.

In the upper chain 43, an upper chain tensioner 49 is arranged between the intermediate sprocket 47 and the intake side cam sprocket 41 where the chain is loosened. The tension arm 49a of the upper chain tensioner 49 is attached to the cylinder head 3. A rod cylinder 49c pivotally supported by a fixed pivot portion 49b and accommodating a push rod for pressing the tension arm 49a penetrates the protruding portion 3a of the cylinder head 3 so that maintenance can be performed from the outside. It is fixed to the mounting hole.

The mounting portion 32 of the mounting portion of the mount bracket 30 located near the center of the engine in the width direction (cylinder axis X) is disposed so as to overlap the pivot portion 49b of the upper chain tensioner 49. The hole 32a for the pivot part opened in the cylinder head 3 in front of the pivot part 49b also serves as the mounting hole of the mount bracket 30, and the blind plug 3 for closing the hole 32a.
2b also serves as a mounting bolt for fixing the mount bracket 30 to the cylinder head 3.

In the lower chain 45, a lower chain tensioner 50 is arranged between the output sprocket 44 and the intermediate sprocket 48 that cause the slack of the chain.
Tension arm 50 of lower chain tensioner 50
a is a pivot part 50 fixed to the cylinder block 4.
rod cylinder 50 pivotally supported by b and accommodating a push rod for pressing the tension arm 50a.
The c is fixed to a mounting hole that penetrates below the alternator support portion 4a of the cylinder block 4 so that maintenance can be performed from the outside.

The alternator support portion 4a of the cylinder block 4 is formed so as to integrally project from the cylinder block 4 in order to support the lower portion of the alternator 11, and the alternator 11 is formed in the support portion 4a.
A fixing portion 35 is formed for fixing the lower part of the with a bolt.

FIG. 3 shows the arrangement of the water pump, the oil pump, the oil cooler, and their associated members installed in the engine.

As shown in FIG. 2, the oil level of the oil accumulated in the oil pan 6 is L ₁ when the oil pump 52 is stopped, and is L ₂ when the oil pump 52 is in operation. In this state, the engine body 1 is installed so as to be inclined so that the oil level of this oil serves as a horizontal reference.

A water pump 10, an oil pump 52, and an oil cooler 9 installed at various parts of the engine body 1.
Are arranged on the front side of the engine body 1,
As shown in FIG. 3, the upper water pump 10 installed in the cylinder block 3 and the lower oil pump 52 installed over the crank case 5 above the oil pan 6 are The shafts are arranged at positions substantially opposite to each other with the output shaft 22 interposed therebetween.

The oil cooler 9 has an inlet / outlet for cooling water and oil at a height approximately midway between the water pump 10 and the oil pump 52 in an engine in which the cooling water and the oil are installed in an inclined manner. 5
It is arranged so as to be located at the apex of a triangle whose base is the line connecting the two.

Although not shown, the water pump 10 has a pump housing formed by a cylinder block 4, a front cover 7 that covers the front surfaces of the cylinder block 4 and the crankcase 5, and an outer cover that covers the front surface of the front cover 7. The turbine is arranged in the pump housing.

In this water pump 10, as shown in FIG. 1, the rotating shaft of the turbine is extended to the outside of the front cover 7 as an input shaft 14, and the pulley 1 is provided at the tip thereof.
8, the cooling water discharged by driving the water pump 10 is fed into the cylinder block 4 through the cooling water jacket opening 66 of the cylinder block, and is not shown. , Is supplied to the oil cooler 9 through a cooling water passage formed integrally with the front cover 7, and is passed from the oil cooler 9 to a water pump through a cooling water passage formed in the crankcase 5 and the cylinder block 4. Returned to 10.

The oil pump 52 includes a chain 54 that meshes with an oil pump side output sprocket 53 fixed to the output shaft 22 of the crankshaft side by side with a camshaft side output sprocket 44 (shown in FIG. 2). Driven by the rotation of the output shaft 22 of the crankshaft via the oil pump 52.
Lubricating oil collected in the oil pan 6 is stored in the strainer 5
It is sucked up through 5 and fed to the oil cooler 9 by the oil feeding pipe 56.

The oil cooler 9 has a cooler portion 9a and a filter portion 9b built in and integrated therein. As shown in FIG. 1, the oil cooler 9 is formed on the outer surface of the oil pan 6 at a recessed portion on the inner side of the oil pan 6. It is arranged along with and is directly attached to the lower surface of the crankcase 5.

The oil sent from the oil pump 52 to the oil cooler 9 is cooled by the cooler portion 9a.
Is cooled by the cooling water sent from the water pump 10 and is filtered by the filter portion 9b, then is sent to the upper main hole 58 through the oil passage 57, and is supplied to each part of the engine from the main hole 58. Then, a part thereof is fed from the main hole 58 to the cylinder head 3 through the oil passage 59.

In the engine of this embodiment having the above-mentioned structure, the cam phase angle varying device 8 arranged above the engine is sucked by the oil sent to the cylinder head 3 through the oil passage 59. Change the phase angle between the camshaft 38 and the cam sprocket 41 on the side,
The valve timing of an intake valve (not shown) is changed according to the operating state of the engine.

As shown in FIGS. 4 and 5, the cam phase angle varying device 8 has a solenoid valve 81 for hydraulic control and an oil transfer portion 82 provided with an oil passage for supplying oil from the solenoid valve. And a variable operating portion 84 that changes the phase angle between the cam shaft 38 and the cam sprocket 41 by the oil pressure of the oil, and a cover portion 83 that covers the front of the variable operating portion 84.

The solenoid valve 81, the oil transfer portion 82, and the cover portion 83 are formed as a single unit that is integrally assembled in advance prior to the work of mounting the cam phase angle varying device 8 on the engine. A variable actuating portion 84 that changes the phase angle between the cam shaft 38 and the cam sprocket 41 by the oil pressure of oil is attached to the front end of the cam shaft 38 by a bolt 85.

The fixing portion of the engine body 1 for mounting the cam phase angle varying device 8 as described above covers the front of the chain chamber 3b which is a space in the cylinder head 3 where the timing chain 43 is arranged.
Of the front end wall 3c and the upper surface of the front end wall 3c from above with bolts 7
It is formed by a mounting bracket 70 that is integrally fixed by tightening at 4.

That is, as shown in FIG. 6, a semicircular recess 3d is formed in the front end wall 3c of the cylinder head downward from the mating surface with the mounting bracket 70, and the mounting bracket 70 has a front end wall 3c. A semi-circular concave portion 70a is formed upward from the mating surface with and the mounting bracket 70 is fixed to the upper surface of the front end wall 3c, so that the cam phase angle varying device 8 can be changed on the front surface of the engine body 1. An opening 71 having a diameter through which the operating portion 84 can pass is formed.

The variable actuating portion 84 of the cam phase angle varying device 8 is located at the front end of the camshaft 38 through the opening 71 and mounted on the camshaft 38 with the bolt 85, and then the solenoid valve 81 and the oil transfer portion 82 are connected. The unit in which the cover portion 83 is integrally assembled beforehand is used as the opening portion 71.
Of the variable actuating portion 84 to the recess 84a in front of the bolt 85 of the variable actuating portion 84.
The front end wall 3c of the cylinder head 3 in the state of connecting a
The cover body 83 is bolted from the front with a fixing portion 75 provided at an appropriate position of the mounting bracket 70 and the engine body 1
By fixing the cam phase angle varying device 8 including the solenoid valve 81, the entire cam phase angle varying device 8 is fixed to the engine.

At this time, as shown in FIG. 6, a communication hole 61a of an oil passage 61 for supplying oil to the solenoid valve 81 is opened in the front surface of the cylinder head 3 to discharge the oil from the solenoid valve 81. The drain holes 73 are opened, and the solenoid valves 8 are provided by mounting the above-mentioned unit as shown in FIG.
One oil inlet 81a and one oil outlet 81b are respectively connected.

By the way, in order to feed oil to the solenoid valve 81, a communication hole 61 is formed in the front surface of the cylinder head 3.
As shown in FIG. 3, the oil passage 61 with the opening a is pumped up from the oil pan 6 by the oil pump 52, passes through the oil cooler 9, and passes through the main hole 5.
In order to supply the oil delivered to the cylinder head 3 side to the cylinder head 3, the cylinder head 3 is connected to the oil passage 59 formed in the cylinder block 4 branching from the main hole 58. It is formed continuously with the oil passage 60 formed inside.

That is, the oil passage 60 connected to the oil passage 59 of the cylinder block 4 is shown in FIGS.
As shown in FIG. 5, an oil passage 61 for supplying oil to the solenoid valve 81 and an oil passage 62 for supplying oil for lubrication to the camshafts 38 and 39 are branched from the middle thereof. The end 61a of the oil passage 61 for supplying oil to 81 is
A front surface of the front end wall 3c of the cylinder head 3 is opened in a range where the solenoid valve 81 is arranged.

On the other hand, in the camshaft lubricating oil passage 62 after branching, as shown in FIG. 8, the throttle portions 63 and 64 whose ends are opened to the bearing portions 3e and 3f of the camshafts 38 and 39, respectively. Is diverged, and these throttle parts 63, 6
A proper amount of oil is supplied to the bearing portions 3e and 3f of the camshafts 38 and 39 via the shaft 4.

5 and 7, etc., 91 is a head bolt hole, 92 is a cam cap bolt hole, and 93 is an ignition plug hole.

According to the engine of this embodiment in which the cam phase angle varying device 8 is mounted as described above, the solenoid valve is constituted by the front end wall 3c of the cylinder head 3 and the mounting bracket 70 fixed to the upper surface thereof. 81
The cam phase angle varying device 8 as a whole can be fixed to the engine body 1 with high rigidity, and the number of parts for mounting the cam phase angle varying device 8 can be significantly reduced.

The integrated solenoid valve 8
1 and the oil transfer part 82 and the cover part 83 are connected to the oil transfer part 82 and the variable operating part 84 through the opening 71, and fixed to the front end wall 3c of the cylinder head 3 and the mounting bracket 70. Since the solenoid valve 81 and the oil transfer portion 82 can be assembled to the variable actuating portion 84 attached to the front end of the valve 38, the mounting work of the entire cam phase angle varying device 8 including the solenoid valve 81 to the engine body 1 is extremely simple. It can be carried out.

Further, since the oil passage 61 to the solenoid valve 81 and the drain hole 73 are opened in the area where the solenoid valve 81 is arranged on the front surface of the front end wall 3c of the cylinder head 3, the unit including the solenoid valve 81 is formed. The oil inlet 81a of the solenoid valve 81 and the oil passage 61 of the cylinder head 3 can be connected to each other only by fixing the oil to the front surface of the engine, and the oil outlet 81b of the solenoid valve 81 and the oil drain hole 73 can be connected. Can be connected.

Further, the oil passage 6 on the cylinder head 3 side connected to the oil passage 59 on the cylinder block 4 side.
0 is the oil passage 61 to the solenoid valve on the way
And a camshaft lubricating oil passage 62, and the camshaft lubricating oil passage 62 has a throttle portion 63,
Since 64 is formed, the solenoid valve 81 and each camshaft 3 are not provided in the cylinder head 3 without separately providing two oil passages having different oil supply amounts.
An appropriate amount of oil can be supplied to each of the bearing portions 3e and 3f of 8, 39, and the oil passage formed in the cylinder head 3 can be reduced.

[0057]

According to the mounting structure of the cam phase angle varying device for the engine of the present invention as described above, the number of parts for mounting the entire device on the engine body can be reduced, and the mounting work is easy. Become
Cost can be reduced.

Further, according to the structure described in claim 2, the cam phase angle varying device can be fixed with high rigidity by the mounting bracket, and according to the structure described in claim 3, the solenoid is provided. The valve and the oil passage in the cylinder head can be easily connected to each other, and according to the configuration described in claim 4, the oil passage formed in the cylinder head can be reduced. According to the configuration described in the item 5, the solenoid valve and the oil drain hole can be easily connected, and in any case, the assembly or processing can be simplified and the cost can be reduced. .

[0059]

[Brief description of drawings]

FIG. 1 is a front view showing an entire 4-cycle engine to which a mounting structure for a cam phase angle varying device of the present invention is applied.

FIG. 2 is an explanatory diagram showing a positional relationship of cam chains in the engine shown in FIG.

3 is an explanatory diagram showing a positional relationship between a water pump, an oil pump, and an oil cooler in the engine shown in FIG.

FIG. 4 is a front view showing an embodiment of a mounting structure for a cam phase angle varying device of the present invention.

5 is an explanatory partial top view of the mounting structure of the cam phase angle varying device shown in FIG.

6 is a front view showing a mounting portion on the engine body side of the mounting structure for the cam phase angle varying device shown in FIG. 4;

7 is a top view showing a state in which a cylinder head cover of a mounting portion on the engine body side shown in FIG. 6 is removed.

8 is a sectional view of the cylinder head taken along the line AA of FIG.

9 is a side view of the front portion of the cylinder head as seen from the direction of arrow B in FIG.

10 is a bottom view of the front portion of the cylinder head as seen from the direction of arrow C in FIG.

[Explanation of symbols]

 1 Engine 3 Cylinder Head 3c (Cylinder Head) Front End Wall 8 Cam Phase Angle Variable Device 38 (Intake Side) Camshaft 41 (Intake Side) Cam Sprocket 60 Oil Passage 61 (Solenoid Valve) Oil Passage 62 (Camshaft) Lubrication) Oil passage 63 Throttle portion 64 Throttle portion 70 Mounting bracket 71 Opening portion 73 Drain hole 81 Solenoid valve 82 Oil transfer portion 83 Cover portion 84 Variable actuation portion (of cam phase angle varying device)

Claims (5)

[Claims] 1. A variable actuation part of a cam phase angle varying device for changing a phase angle between a camshaft and a cam sprocket by means of oil pressure of oil supplied from a hydraulic control solenoid valve through an oil transfer part is mounted on a front end of the camshaft. In the four-cycle engine, the unit of the solenoid valve and the oil transfer unit, which are integrally assembled, is fixed to the front surface of the engine body in front of the camshaft, and the cam phase angle variable in the engine is variable. Device mounting structure. 2. A variable actuating portion of a cam phase angle varying device passes through a front end wall of a cylinder head and a mounting bracket integrally fixed to an upper surface of the front end wall by bolting from above. A cylinder head and a unit of the oil transfer section are integrally formed so that an opening having a possible diameter is formed and the oil transfer section is connected to the variable actuating section through the opening. The mounting structure for a cam phase angle varying device in an engine according to claim 1, wherein the mounting structure is fixed to the front end wall of the engine and the mounting bracket from the front. 3. The front surface of the front end wall of the cylinder head is formed with an end of an oil passage formed in the cylinder head for supplying oil to the solenoid valve. A mounting structure of a cam phase angle varying device in the engine according to [1]. 4. An oil passage for supplying oil to a solenoid valve and an oil for lubrication to a camshaft from the middle of an oil passage formed in the cylinder head by connecting to an oil passage on the cylinder block side. 4. The cam phase angle varying device for an engine according to claim 1, wherein the oil passage for performing the operation is branched, and the branched camshaft lubricating oil passage is formed with a throttle portion. Construction. 5. The cam phase angle in an engine according to claim 1, wherein a drain hole for oil supplied into the solenoid valve is opened in the front surface of the front end wall of the cylinder head. Variable device mounting structure.