JPH11210422A - Valve timing changing device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent efficiently by a simple structure the displacement of a mounting member in the rotational direction of a camshaft without lowering the assemblage of the mounting member comprising a camshaft side member or a cam pulley side member. SOLUTION: In this valve timing changing device equipped with a rotor 28 fixed on a camshaft 1 driving the intake valve or exhaust valve of an engine and a housing 15 fixed on a cam pulley inputting driving force to the camshaft 1, and changing the opening/closing timing of the intake valve or exhaust valve of the engine by changing the rotational phase between the housing 15 and the rotor 28, a positioning part comprising a positioning pin 36 and a positioning hole 37 which regulate the displacement of the rotor 28 in a rotational direction while allowing the movement of the rotor 28 in the diametral direction of the camshaft 1, is arranged in a fixing part for the rotor 28 and the camshaft 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve timing changing device for an engine which changes the opening and closing timing of an intake valve and an exhaust valve which are driven to open and close in accordance with the rotation of a camshaft.

[0002]

2. Description of the Related Art Conventionally, as shown in, for example, Japanese Patent Application Laid-Open No. 9-250311, a valve timing changing mechanism for changing the operation timing of a valve is provided at an end of a cam shaft for driving an intake valve or an exhaust valve of an engine. In the engine valve timing changing device provided with the phase changing mechanism, an oil passage for supplying the working oil pressure to the valve timing changing mechanism is formed in the camshaft, and according to the working oil pressure supplied from the oil passage. By operating a valve timing changing mechanism, a rotation phase of a cam shaft with respect to an output shaft of an engine is changed to change an operation timing of a valve.

The valve timing changing mechanism comprises a camshaft-side member comprising a rotor (vane) fixed to a camshaft by mounting bolts, and a case (rounded by a plurality of bolts fixed to a cam pulley (driven gear)) surrounding the rotor. A) a cam pulley-side member made of a case), and an advance-side hydraulic chamber formed between a pressure receiving portion protruding from the outer peripheral surface of the rotor and a protruding portion protruding from the inner peripheral surface of the case. By supplying operating hydraulic pressure to the retard hydraulic chamber, the rotational phase of the camshaft with respect to the output shaft of the engine is changed.

[0004]

The advance-side hydraulic chamber and the retard angle are provided between the pressure receiving portion projecting from the outer peripheral surface of the rotor and the projecting portion projecting from the inner peripheral surface of the case as described above. In the case where the side hydraulic chamber is formed and the operating timing of the valve is changed by selectively supplying and discharging the operating hydraulic pressure to and from these hydraulic chambers, the camshaft side member composed of the rotor is used. The valve timing changing mechanism is firmly fixed to the camshaft, the cam pulley side member made of the above case is fixed to the cam pulley, and the displacement of the camshaft and the cam pulley in the rotation direction of these fixed portions is restricted. It is necessary to ensure the accuracy of changing the valve timing due to the above.

In order to prevent displacement of the cam pulley-side member or the like composed of the rotor, a positioning pin projecting from an end face of the camshaft is engaged with a positioning hole formed in a wall surface of the rotor and positioned. Therefore, even if the fixing force of the rotor by the mounting bolts becomes weak,
The displacement of the cam pulley side member and the like in the rotation direction of the cam pulley is regulated.

However, in order to reliably restrict the displacement of the camshaft-side member or the like composed of the rotor by the positioning portion formed by the positioning pin and the positioning hole, the diameters of the positioning pin and the positioning hole must be accurately matched. This necessitates a problem that the structure of the positioning portion becomes complicated and that the operation of assembling the rotor to the camshaft becomes complicated. Conversely, if the diameter of the positioning hole is formed larger than the positioning pin so that the camshaft-side member composed of the rotor can be easily assembled to the camshaft, the positioning accuracy is reduced.
There is a problem that it is not possible to sufficiently restrict displacement of the mounting member such as a rotor in the rotation direction of the camshaft in the fixed portion.

In view of the above circumstances, the present invention displaces the mounting member in the rotation direction of the camshaft without reducing the assemblability of the mounting member including the camshaft side member or the cam pulley side member. The present invention provides an engine valve timing changing device which can effectively prevent the above problem with a simple configuration.

[0008]

The invention according to claim 1 is
A camshaft-side member fixed to a camshaft that drives an intake valve or an exhaust valve of the engine; and a cam pulley-side member fixed to a cam pulley that inputs a driving force to the camshaft. By changing the rotation phase with the shaft side member,
A valve timing changing device configured to change the opening / closing timing of the valve, wherein the cam shaft side member moves in a radial direction of the cam shaft to a fixed portion between the cam shaft side member and the cam shaft. A positioning portion for restricting the displacement in the rotating direction is provided while allowing.

According to the above construction, when the camshaft-side member is fixed to the camshaft, the camshaft-side member is allowed to be displaced in the radial direction of the camshaft at the positioning portion. The displacement of the assembling position caused in the radial direction of the camshaft due to the above is absorbed by the positioning portion. Further, in the fixed state of the camshaft-side member, the camshaft-side member is effectively prevented from being displaced by rotation.

According to a second aspect of the present invention, there is provided a camshaft side member fixed to a camshaft for driving an intake valve or an exhaust valve of an engine, and a cam pulley side member fixed to a cam pulley for inputting a driving force to the camshaft. A valve timing changing device configured to change the rotation phase of the cam pulley side member and the camshaft side member to change the opening / closing timing of the valve, wherein the cam pulley side member and A positioning portion is provided at a fixed portion with the cam pulley, while allowing the cam pulley side member to move in the radial direction of the cam pulley, while restricting displacement in the rotation direction.

According to the above construction, when the cam pulley-side member is fixed to the cam pulley, the cam pulley-side member is allowed to be displaced in the radial direction of the cam pulley in the positioning portion. The displacement of the mounting position generated in the radial direction of the cam pulley is absorbed by the positioning portion. In the fixed state of the cam pulley-side member, the cam pulley-side member is effectively prevented from being displaced by rotation.

According to a third aspect of the present invention, in the engine valve timing changing device according to the first or second aspect, the mounting member comprising the camshaft side member and the cam pulley side member, and the mounting member comprising the camshaft and the cam pulley. On one side of the mounting member, a positioning hole formed of a long hole extending in the radial direction is formed, and on the other side, a positioning pin inserted into the positioning hole is protruded, and positioning is performed by the positioning pin and the positioning hole. It constitutes a part.

According to the above construction, for example, when the mounting member formed of the camshaft side member is fixed to the mounted member formed of the camshaft, the positioning pin is inserted into the positioning hole, resulting in a manufacturing error. The displacement of the mounting position caused in the radial direction of the mounting member and the mounted member is absorbed in the positioning hole, and the camshaft side member is fixed in a state where it is accurately positioned in the rotation direction of the camshaft. Will be.

According to a fourth aspect of the present invention, there is provided the engine valve timing changing apparatus according to any one of the first to third aspects, wherein the camshaft-side member comprising a rotor fixed to the camshaft and the cam pulley are provided. A cam pulley-side member composed of a fixed housing, and a case attached to the housing and surrounding the rotor; an advance-side hydraulic chamber formed between a vane protruding from the case and the rotor; and A valve timing changing mechanism configured to change the rotation phase of the cam pulley side member and the cam shaft side member by supplying operating hydraulic pressure to the retard side hydraulic chamber.

According to the above arrangement, for example, when the camshaft-side member including the rotor of the valve timing changing mechanism is fixed to the camshaft, the rotor is allowed to be displaced in the positioning portion in the radial direction of the camshaft. By doing so, the rotor was mounted on the camshaft in a state where the displacement of the mounting position caused in the radial direction due to the manufacturing error was absorbed, and the rotor was accurately positioned in the rotation direction of the camshaft. It will be fixed in a state.

[0016]

FIG. 1 shows an engine valve gear having an engine valve timing changing device according to an embodiment of the present invention. The valve train includes a camshaft 1 for driving an intake valve or an exhaust valve (not shown).
And an enlarged diameter portion 1 formed at one end of the camshaft 1.
a cam pulley 2 rotatably supported by the cam pulley 2 and a journal portion 1b disposed at a position closest to the cam pulley 2 on the inner side of the enlarged diameter portion 1a, that is, at the center in the output shaft direction of the engine. A cam cap 4 rotatably supported on the upper end of the cylinder head 3, a valve timing changing mechanism 5 attached to one end of the camshaft 1, and an oil for controlling the supply and discharge of hydraulic pressure to and from the valve timing changing mechanism 5. A control valve 6 is provided.

The camshaft 1 is provided with a rotating plate 8 having a detected part 8a detected by a detecting means comprising a cam position sensor 7, the journal part 1b provided at one end of the camshaft 1, The cam body 14 provided on the inner side, that is, on the center side of the camshaft 1
It is arranged between the installation sections.

The cam position sensor 7 comprises an electromagnetic pickup sensor or the like using a Hall element or an MRE (magnetic resistance element). The cam position sensor 7 is provided on the upper wall of the cylinder head cover 11 on the inner side of the oil control valve 6. The rotating plate 8 is mounted in an oblique direction so as to point to the installation position, that is, in a state where the tip is inclined so as to face the lower outside of the cylinder head cover 11. A rotation sensor that detects the rotation phase of the shaft 1 is configured. The detected part 8a of the rotating plate 8 is bent obliquely in accordance with the installation direction of the cam position sensor 7.

The camshaft 1 has an advanced oil passage 9 and a retarded oil passage 10 extending from the journal 1b to the end of the camshaft 1. The two oil passages 9 and 10 are provided in mounting holes 1 into which mounting bolts 12 of the valve timing changing mechanism 5 are screwed.
Along with being arranged in a state of inclining, avoiding 3,
Large-diameter drill holes 9a, 10a formed on the end side of the camshaft 1, that is, on the enlarged-diameter portion 1a side of the camshaft 1,
The small-diameter drill holes 9b, 10a extending from the bottoms of the large-diameter drill holes 9a, 10a to the installation portion side of the journal 1b.
b. Thereby, the hole diameter of the oil passages 9 and 10 located on the journal portion 1b side becomes
Oil passages 9 and 10 located on the end side of camshaft 1
Is set to be smaller than the hole diameter.

As shown in FIG. 2, the two oil passages 9 and 10 do not overlap with the protrusion of the cam body 14 when viewed from the end of the camshaft 1.
4 are disposed so as to avoid the position where the protrusions exist. That is, in the four-cylinder type in-line engine, the projections of the cam body 14 are arranged at regular intervals at four locations around the camshaft 1 in correspondence with the number of cylinders. The cam body 14 is located at a position radially offset from the center of the camshaft 1 by a predetermined distance between the oil passages 9 and 9 and the pair of oil passages 10 and 10 on the retard side.
The oil passages 9 and 10 are arranged between the protrusions of the oil passage 9 so as to face each other at regular intervals.
Are disposed so as not to overlap with the projection of the cam body 14.

As shown in FIG. 1, the cam pulley 2 and the valve timing changing mechanism 5 are arranged close to each other, and the cam pulley 2 is fixed to a housing 15 of the valve timing changing mechanism 5 by mounting bolts 16. .
Then, the cam pulley 2 is rotationally driven by the timing belt 17 wound around the output shaft of the engine,
When this driving force is input to the camshaft 1 via the valve timing changing mechanism 5, the camshaft 1 is driven to rotate.

The cam cap 4 has oil passages 18 and 19 for supplying working oil pressure to the oil passages 9 and 10 and ring grooves 20 and 21 extending over the cylinder head 3. In addition, on the upper surface of the cam cap 4, the oil grooves 18,
An adapter 24 having oil passages 22 and 23 communicating with 19 is attached, and the cam cap 4 is connected to the oil control valve 6 via the adapter 24. The operating oil pressure supplied from the oil control valve 6 to the oil passages 22 and 23 of the adapter 24 is applied to the oil passages 9 and 9 of the camshaft 1 via the oil passages 18 and 19 of the cam cap 4 and the ring grooves 20 and 21. 10.

The valve timing changing mechanism 5 includes a housing 15 mounted on the enlarged diameter portion 1a of the camshaft 1.
And a case 26 and an outer plate 27 fixed to the outer end of the housing 15 by mounting bolts 25, and a rotor 28 attached to an end of the camshaft 1. The housing 15 and the case 26 are rotatably supported by bearings 29 held by the cam cap 4 and the cylinder head 3. The rotor 28 is fixed to the end of the camshaft 1 by a mounting member including the mounting bolt 12 in a state surrounded by the case 26 between the housing 15 and the outer plate 27.

The inner peripheral surface of the case 26 and the rotor 28
As shown in FIG. 3, four vanes 30 and 31 are respectively provided on the outer peripheral surface of the outer periphery of the vane to face each other.
A vane 31 protruding from a rotor 28 and an advancing hydraulic chamber 32 for rotating the camshaft 1 to the advancing side with respect to the cam pulley 2; And a retard-side hydraulic chamber 33 that rotates to the side. Sealing materials for sealing the advance hydraulic chamber 32 and the retard hydraulic chamber 33 are provided at the distal ends of the vanes 30, 31, respectively.

Then, as shown in FIG. 4, the advancing side oil passage 9 formed in the camshaft 1 is connected to the advancing side oil passage 34 via an oil passage 34 formed inward of the rotor 28. When the hydraulic pressure is supplied to the hydraulic chamber 32, the vane 3
By rotating the camshaft 1 clockwise in the drawing, the rotational phase of the camshaft 1 with respect to the output shaft of the engine is advanced. As shown in FIG. 3, the retard-side hydraulic chamber 33 extends from the retard-side oil passage 10 formed in the camshaft 1 via an oil passage 35 formed outside the rotor 28. Is supplied with the operating oil pressure, the vane 31 protruding from the rotor 28 is driven to rotate counterclockwise in the drawing,
The rotation phase of the camshaft 1 with respect to the output shaft of the engine is retarded.

As shown in FIGS. 5 and 6, a positioning pin 36 protrudes from the end surface of the camshaft 1, and a long hole extending in the radial direction is formed in the rotor 28 of the valve timing changing mechanism 5. Is formed on the wall surface. When the positioning pin 36 of the camshaft 1 is inserted into the positioning hole 37 of the rotor 28, the rotor 28 is accurately positioned with respect to the rotation direction of the camshaft 1, and the mounting bolt 12 To the end of the camshaft 1.

As shown in FIGS. 5 and 7, the housing 15 of the valve timing changing mechanism 5 has a pair of positioning pins 38 and 39 projecting therefrom, and the cam pulley 2 has a round hole. Positioning hole 40 and positioning hole 41 composed of a long hole extending in the radial direction of cam pulley 2
Are formed on the wall surface. And the positioning hole 4
With the positioning pins 38 and 39 inserted into the cam bolts 0 and 41, the cam pulley 2 is accurately positioned with respect to the rotation direction of the camshaft 1, and the mounting bolt 16
To the housing 15.

As shown in FIG. 1, the control valve 6 includes a valve case 42 attached to the upper end surface of the cylinder head cover 11 and a spool 4 installed in a spool installation hole 43 formed in the valve case 42.
4, a spool drive means 45 comprising an electromagnetic solenoid for driving the spool 44, a union bolt 47 and an oil filter 48 installed in an inlet hole 46 formed in the valve case 42, The upper end of the adapter 24 is configured to be inserted into a fitting insertion hole 49 formed in 42.

The spool 44 is, as shown in FIG.
The spool drive means 45 is installed at one end of the engine body E in the width direction, that is, in a direction orthogonal to the output shaft of the engine body E, and is provided on the outer end side of the spool 44.
Is installed. That is, the engine body E is mounted horizontally on the front of the vehicle body, and the spool 44 is disposed in the front-rear direction of the vehicle body above the intake valve camshaft 1 located on the rear side of the vehicle body. In this case, a spool driving means 45 composed of an electromagnetic solenoid is installed behind the spool 44 on the vehicle body side, and the spool 44 is driven by the spool driving means 45 in the axial direction.

Further, the adapter 24 is disposed on the inner side of the spool 44 (the center in the output shaft direction of the engine body E), and the outer side of the spool 44 (the engine). Outer end side of main body E in the output shaft direction)
The union bolt 47 is disposed, and an oil pipe 50 for supplying an operating oil pressure to an installation portion of the union bolt 47 is connected to the union bolt 47.

The oil pipe 50 has one end connected to an oil gallery (not shown) formed on the side wall of the engine body E by an oil joint 52, and the other end connected to the installation portion of the cylinder head cover 11. At the detoured position, the union bolt 47 is connected to the installation portion of the union bolt 47 by an oil joint 51. The operating oil pressure supplied from the oil pipe 50 to the installation portion of the union bolt 47 is applied to the oil passage 5 formed in the union bolt 47.
3 through the oil filter 48 and the spool 44
(See FIG. 1).

When the spool 44 is operated by the spool driving means 45, one of the oil passages 54, 55 formed in the valve case 42 is connected to the oil passages 22, 23 formed in the adapter 24. On the other hand, the operating oil pressure is selectively supplied. In addition, the above adapter 2
4 at the same time as the operating oil pressure is supplied to one of the oil passages 22, 23, the oil passages 54,
Hydraulic oil led to the installation portion of the spool 44 through the drain 55 is supplied to a drain passage 56 formed in the valve case 42.
Thus, the fluid is returned into the cylinder head cover 11 via a drain receiver 57 formed between the valve case 42 and the cylinder head cover 11. In addition,
A sealing material 5 is provided between the cylinder head cover 11 and the cam cap 4 to prevent the hydraulic oil flowing down from the drain receiver 55 from flowing into the installation portion of the cam pulley 2.
8 are installed.

When the output shaft of the engine rotates in the above configuration, the driving force is transmitted to the cam pulley 2 by the timing belt 17 to rotate the cam pulley 2, and the driving force is transmitted via the valve timing changing mechanism 5. The intake valve or exhaust valve (not shown) is opened and closed at a predetermined timing by rotating the camshaft 1.

The rotational phase of the camshaft 1 is detected by the cam position sensor 7 and this detection signal is input to a control unit (not shown), so that the operation timing of the intake valve or the exhaust valve is controlled by the control unit. Is detected. Then, a control signal corresponding to the operating state of the engine is output from the control unit to the spool driving means 45 of the oil control valve 6, whereby the operation timing of the intake valve and the like is changed.

When changing the operation timing of the intake valve or the like, the operating oil pressure supplied from the oil gallery of the engine body E is supplied from the oil pipe 50 to the installation portion of the union bolt 47, and the union bolt 4
The oil is supplied from the oil passage 53 through the oil filter 48 to the installation portion of the spool 44. When the operation timing is advanced, the camshaft 1 is connected to the oil passage 54 formed in the valve case 42 via the oil passage 22 of the adapter 24, the oil passage 18 of the cam cap 4, and the ring groove 20. The spool 44 is driven by the spool driving means 45 so that the operating oil pressure is supplied to the formed advanced oil passage 9. As a result, after the working oil pressure is sent to the end side of the camshaft 1 through the oil passage 9 on the advance side, it is supplied from the oil passage 34 of the rotor 28 to the advance side hydraulic chamber 32, The vane 31 of the rotor 28 rotates in the advance direction to advance the operation timing of the intake valve and the like.

When the operation timing is retarded,
From the oil passage 55 formed in the valve case 42, through the oil passage 23 of the adapter 24, the oil passage 19 of the cam cap 4, and the ring groove 21, the oil passage 10 on the retard side formed in the camshaft 1 is formed. So that hydraulic pressure is supplied to
The spool 44 is operated by spool driving means 45. As a result, the operating oil pressure is reduced to the oil passage 1 on the retard side.
After being sent to the end side of the camshaft 1 through the oil passage 35, the operating oil pressure is supplied from the oil passage 35 of the rotor 28 to the retard hydraulic pressure chamber 33, so that the vane 31 of the rotor 28 moves in the retard direction. It rotates and the operation timing of the intake valve and the like is delayed.

As described above, the operation timing of the intake valve and the like is changed, and the operation timing is detected according to the detection signal of the cam position sensor 7. The deviation between the actual valve operation timing detected based on the detection signal of the cam position sensor 7 and the target operation timing set in accordance with the operation state of the engine is equal to or less than a predetermined value. When the control unit confirms that the
By outputting the control signal for operating the spool 44 to the neutral holding position, the operation timing is held until the operation for changing the operation timing is started again.

The camshaft-side member comprising the rotor 28 fixed to the camshaft 1 for driving the intake valve or the exhaust valve of the engine as described above, and the camshaft 1
And a cam pulley side member comprising a housing 15 fixed to the cam pulley 2 for inputting a driving force to the cam pulley 2. By changing the rotational phase of the housing 15 and the rotor 28, the opening / closing timing of the valve is changed. In the valve timing changing device configured as described above, the position of the rotor 28 and the camshaft 1 is shifted in the rotational direction of the camshaft 1 while allowing the rotor 28 to move in the radial direction of the camshaft 1. Positioning portion for regulating the position, ie, positioning pin 3 protruding from camshaft 1
6 and the positioning hole 37 formed of a long hole extending in the radial direction of the rotor 28, the rotor 28 can rotate the camshaft 1 without lowering the assemblability of the camshaft-side member formed of the rotor 28. The displacement in the direction can be effectively prevented with a simple configuration.

That is, when the camshaft-side member composed of the rotor 28 is fixed to the camshaft 1, the positioning portion allows the rotor 28 to be displaced in the radial direction of the camshaft 1, so that The displacement of the assembling position generated in the radial direction of the camshaft 1 due to a manufacturing error or the like of the rotor 28 is absorbed by the positioning portion, so that the assembling work on the camshaft 1 can be easily performed. . In particular, as shown in the above embodiment, when the camshaft 1 is configured to be fixed in a state where the end of the camshaft 1 is fitted into the concave portion 28a formed on the inner surface side of the side wall portion of the rotor 28, the diameter of the camshaft 1 The direction position is restricted by the concave portion 28a,
The positional deviation in the radial direction due to the manufacturing error is likely to occur in the positioning portion, but this positional deviation can be reliably absorbed by adopting the above configuration.

In a fixed state of the camshaft-side member composed of the rotor 28, the rotor 28 is effectively prevented from being displaced in its rotational direction, and accurately positioned with respect to the rotational direction of the camshaft 1. Can be positioned. Therefore, the rotor 28 by the mounting bolt 12 is used.
Even if the fixing force becomes weak, it is possible to effectively prevent a situation in which the rotor 28 is displaced in the rotation direction of the camshaft 1 and the change accuracy of the valve timing changing mechanism is reduced.

A cam pulley side member comprising the housing 15 and a fixing portion of the cam pulley 2
A positioning portion for restricting the cam pulley 2 from moving in the rotational direction while allowing the cam pulley 2 to move in the radial direction, that is, a positioning pin 39 protruding from the housing 15;
Since the positioning hole 41 formed of a long hole extending in the radial direction of the cam pulley 2 is provided, the housing 15 is displaced in the rotation direction of the cam pulley 2 without reducing the assemblability of the cam pulley-side member including the housing 15. Can be effectively prevented with a simple configuration, and the change accuracy of the valve timing changing mechanism can be properly maintained.

In the above embodiment, the positioning hole 40 formed of a round hole and the positioning hole 41 formed of a long hole are provided on the wall surface of the cam pulley 2 so that the positioning hole 40 formed of the round hole is used as a reference. Although the housing 15 is positioned in the radial direction of the cam pulley 2 and the positioning hole 41 formed of the elongated hole absorbs the mounting error in the radial direction, the positioning hole 4 formed of the round hole is used.
0 may be omitted, or a structure in which a positioning hole composed of a plurality of long holes is provided in the wall surface of the cam pulley 2 may be adopted.

In the above-described embodiment, the positioning pins 37 and 39 projecting from the mounting member including the rotor 28 and the housing 15 and the mounting member including the camshaft 1 and the cam pulley 2 to which the mounting member is mounted are formed. Although the example in which the positioning portion is constituted by the positioning holes 38 and 40 formed of the elongated holes described above, the positioning pin is projected from the mounted member, and the mounting member is formed by the elongated hole extending in the radial direction. It is good also as a structure in which the positioning hole was formed.

Further, in place of the above-mentioned structure, the rotor 2 with respect to the attached member comprising the camshaft 1 and the cam pulley 2
8 and a fixing portion of a mounting member comprising the housing 15,
A positioning portion comprising a key and a key groove or a spline and a spline groove can be provided.However, when the positioning portion is formed by the positioning pin and the positioning hole, the positioning can be performed without impairing the assemblability of the mounting member. There is an advantage that displacement of the mounting member in the rotation direction of the camshaft 1 can be effectively prevented with a very simple configuration.

In the above-described embodiment, the valve timing changing mechanism 5 has the vane type valve timing changing mechanism 5 in which the case 26 attached to the cam pulley 2 and the vanes 30 and 31 protrude from the rotor 28 attached to the camshaft 1. Although the change device has been described, the present invention is also applied to a valve timing change device having a valve timing change mechanism such as a helical gear type that moves a ring gear having a helical gear portion by hydraulic pressure and changes the operation timing of a valve by the movement. Applicable.

In the vane type valve timing changing mechanism 5 shown in the above embodiment, the operating hydraulic pressure is supplied to the advance side hydraulic chamber 32 or the retard side hydraulic chamber 33,
This has the advantage that the opening / closing timing of the valve can be changed quickly and easily, but the case 26 and the rotor 2
8 has a demerit that a manufacturing error easily occurs in the radial direction. For this reason, when the above configuration is adopted in the valve timing changing device having the vane type valve timing changing mechanism 5, the opening / closing timing of the valve can be changed quickly and easily, and the diameter caused by the manufacturing error can be changed. At the same time, the effect of absorbing the displacement in the direction and easily attaching the mounting member to the mounting portion can be obtained.

In the above embodiment, the camshaft 1
Rotating plate 8 attached to the cylinder head cover 1
A rotation detecting sensor for the camshaft 1 having a cam position sensor 7 attached to the camshaft 1; a journal 1b provided at one end of the camshaft 1;
The rotating plate 8 is arranged between the cam shaft 1 and the installation portion of the cam body 14 provided at the center of the cam shaft 1, and supplies oil to oil passages 9 and 10 formed at one end of the cam shaft 1. An oil supply means comprising an oil control valve 6 to be disposed above the journal portion 1b;
Since the cam position sensor 7 is installed obliquely on the inner side of the oil supply means so as to be directed to the detected portion 8a of the rotary plate 8, the camshaft 1 may be displaced due to a manufacturing error of the cylinder head cover 11 or the like. Even in the case where the interval between the installation height and the installation height of the cylinder head cover 11 varies, the detection means including the cam position sensor 7 and the detected portion 8a of the rotating plate 8
Can be prevented from being largely deviated.

For example, as shown in FIG. 9A, when the cam position sensor 7 is inclined by the angle θ, the cam position sensor 7 is moved from the proper position A of the rotating plate 8 with respect to the detected portion 8a. When it is displaced upward by L, the cam position sensor 7 and the detected part 8a
Is shifted from the optimum distance by cos θ ′ · L, and the shift amount is smaller than the distance L. On the other hand, as shown in FIG. 9B, when the cam position sensor 7 is installed in a vertical state, the detected portion 8a of the rotating plate 8 is
Is the amount of displacement from the proper position A with respect to the optimum distance between the cam position sensor 7 and the detected part 8a as it is. Therefore, by disposing the cam position sensor 7 in the oblique direction as described above, the detecting means including the cam position sensor 7 and the rotating plate 8
Of the rotation detection sensor can be prevented from deteriorating, and the detection accuracy of the rotation detection sensor can be prevented from lowering.

In addition, on the inner side of the oil supply means comprising the oil control valve 6 disposed above the journal portion 1a as described above, the detected portion 8a of the rotating plate 8 is directed toward the detected portion 8a. Since the cam position sensor 7 is installed obliquely, the installation space of the oil supply means can be easily secured by installing the cam position sensor 7 so as to avoid the oil supply means. Further, as in the case where the cam position sensor 7 is attached to the end of the camshaft 1, the total length of the camshaft 1 becomes long, or when the cam position sensor 7 is attached to the center of the camshaft 1. It is possible to effectively prevent the cam position sensor 7 from being significantly affected by the heat of the engine body E and thermally degraded.

When the spool 44 and the spool driving means 45 of the oil control valve 6 having a predetermined length as described above are installed at one end of the engine body E in the width direction, the spool As in the case where the spool drive means 45 and the spool drive means 45 are installed in the length direction of the engine body E, the spool drive means 45 protrudes toward the outer end side in the length direction of the engine body E so that the overall length of the engine body E is long. The spool 44 and the spool driving means 45 are prevented from being adversely affected by, for example, the fact that the spool driving means 45 comprising an electromagnetic solenoid is disposed at the center of the engine body E and is affected by the heat.
Can be arranged at an appropriate position.

The valve timing changing mechanism 5
The cam position sensor 7 is disposed on the inner side of the oil control valve 6 disposed above the oil control valve 6, so that a detection error occurs in the rotation detection sensor due to the torsional displacement of the camshaft 1. This can be effectively prevented, the rotational phase of the camshaft 1 changed by the valve timing changing mechanism 5 can be accurately detected in accordance with the detection signal of the cam position sensor 7, and based on this detection data. Thus, the opening / closing timing of the valve can be accurately and quickly changed.

That is, the cam position sensor 7 and the rotary plate 8 can be arranged at the end opposite to the installation part of the valve timing changing mechanism 5 and the oil control valve 6, but in this case, When the camshaft 1 is rotated by the valve timing changing mechanism 5 to change the opening / closing timing of the valve, the camshaft 1 is detected by the torsional displacement of the camshaft 1 according to the driving force of the valve timing changing mechanism 5. An error will occur. Therefore, as described above, the valve timing changing mechanism 5 and the oil control valve 6 and the cam position sensor 7 and the rotating plate 8 are connected to the camshaft 1.
It is preferable that the one end of the valve be disposed close to each other so as to prevent a change error in the opening / closing timing of the valve due to the detection error.

In the camshaft 1 for driving the intake valve or the exhaust valve of the engine as described above,
From the journal portion 1b of the camshaft 1 supported by a bearing member including the cam cap 4 and the like, the camshaft 1
A plurality of oil passages 9 and 10 extending toward the end of the camshaft 1 are formed, and the plurality of oil passages 9 and 10 are arranged at positions that do not overlap with the protrusions of the cam body 14 when viewed from the end of the camshaft 1. According to the configuration provided, the oil passages 9, 10
Even when the wall thickness between the installation portion of the camshaft 1 and the outer peripheral portion of the camshaft 1 is reduced to some extent, this camshaft 1
Can be effectively prevented from being damaged. That is, by disposing the oil passages 9, 10 avoiding the installation position of the protrusion of the cam body 14, the plurality of oil passages 9, 10 and the protrusion of the cam body 14 are prevented from overlapping. Therefore, the driving reaction force generated when the intake valve or the exhaust valve is driven by the projection of the cam body 14 is not directly input to the installation portions of the oil passages 9 and 10, and the driving reaction force Accordingly, it is possible to effectively prevent the camshaft 1 from being damaged.

Therefore, it is possible to reduce the overall height of the engine by reducing the size of the bearing portion of the camshaft 1 without taking measures such as increasing the shaft diameter more than necessary to prevent damage to the camshaft 1. it can. In particular, as shown in FIG. 2, the oil passages 9 and 10 are arranged so as to avoid a line connecting each protrusion of the cam body 14 and the axis of the camshaft 1.
When the camshaft 1 is disposed, the camshaft 1 is damaged according to the pressing force when the upper end of the camshaft 1 is pressed against the cam cap 4 by the driving reaction force of the valve, or the driving reaction force of the valve is There is an advantage that the camshaft 1 can be effectively prevented from being damaged by the bending moment acting according to the force.

Further, as shown in the above embodiment, oil passages 9 and 10 extending from the journal portion 1b of the camshaft 1 to the end portion of the camshaft 1 are formed by drilling, and the oil passages 9 and 10 located in the journal portion 1b are formed. If the hole diameter of the passages 9 and 10 is set smaller than the hole diameter of the oil passages 9 and 10 located on the end side of the camshaft 1, the large diameter drill holes 9a,
After the formation of the large-diameter drill holes 9a, 10a
By forming small diameter drill holes 9b and 10b from the bottom of the small diameter drill hole 9 located in the journal portion 1b.
b, 10b and large-diameter drill holes 9a, 10a located on the end side of the camshaft 1, the oil passage 9,
10 can be easily and appropriately formed.

According to the above configuration, the drill is frequently broken because the shaft diameter is small, as in the case where the oil passage composed of a long drill hole having a small hole diameter is formed in the camshaft 1 by one small diameter drill. In such a case, as in the case where an oil passage composed of a long drill hole having a large hole diameter is formed in the camshaft 1 by one large diameter drill, the shaft diameter of the camshaft 1 is changed according to the hole diameter of the drill. The oil passages 9 and 10 having appropriate diameters can be formed easily and appropriately without adverse effects such as enlargement.

[0057]

As described above, according to the present invention, a camshaft-side member comprising a rotor or the like constituting a valve timing mechanism or a cam pulley-side member comprising a housing and a camshaft or a cam pulley to which these are attached are fixed. The camshaft-side member or the cam pulley-side member is provided with a positioning portion for restricting the camshaft-side member or the cam pulley-side member from being displaced in the rotation direction of the camshaft while allowing the camshaft-side member to move in the radial direction. There is an advantage that the camshaft-side member and the like can be effectively prevented from being displaced in the rotation direction of the camshaft 1 with a simple configuration without reducing the assemblability of the side member or the cam pulley-side member.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a valve timing changing device for an engine according to the present invention.

FIG. 2 is a sectional view showing a relationship between a cam profile and an oil passage.

FIG. 3 is a cross-sectional view showing a state where a rotor is rotated in a retard direction.

FIG. 4 is a cross-sectional view showing a state where a rotor is rotated in an advance direction.

FIG. 5 is a cross-sectional view showing a mounting state of a rotor and a camshaft.

FIG. 6 is an end view showing a mounting state of a rotor and a camshaft.

FIG. 7 is an end view showing a state where the cam pulley and the housing are mounted.

FIG. 8 is a plan view showing the overall configuration of the engine body to which the valve gear is attached.

FIG. 9 is an explanatory diagram showing a mounting state of a cam position sensor.

[Explanation of symbols]

 Reference Signs List 1 camshaft 2 cam pulley 5 valve timing changing mechanism 15 housing (cam pulley side member) 26 case 28 rotor (camshaft side member) 30, 31 vane 32 advance hydraulic chamber 33 retard hydraulic chamber 36, 39 positioning pin 37, 41 Positioning hole

Claims (4)

[Claims] 1. A cam pulley having a camshaft side member fixed to a camshaft for driving an intake valve or an exhaust valve of an engine, and a cam pulley side member fixed to a cam pulley for inputting a driving force to the camshaft. A valve timing changing device configured to change an opening / closing timing of the valve by changing a rotation phase of a side member and the camshaft side member,
In the fixed portion between the camshaft side member and the camshaft,
A valve timing changing device for an engine, comprising: a positioning portion for restricting the camshaft-side member from moving in the rotational direction while allowing the camshaft-side member to move in the radial direction of the camshaft. 2. A cam pulley having a camshaft side member fixed to a camshaft for driving an intake valve or an exhaust valve of an engine, and a cam pulley side member fixed to a cam pulley for inputting a driving force to the camshaft. A valve timing changing device configured to change an opening / closing timing of the valve by changing a rotation phase of a side member and the camshaft side member,
An engine, characterized in that a fixing portion between the cam pulley side member and the cam pulley is provided with a positioning portion for restricting the cam pulley side member from moving in the rotational direction while allowing the cam pulley side member to move in the radial direction of the cam pulley. Valve timing change device. 3. A positioning hole comprising a slot extending in a radial direction is formed in one of a mounting member comprising a camshaft side member and a cam pulley side member and a mounted member comprising a camshaft and a cam pulley. 3. The valve timing changing device for an engine according to claim 1, wherein a positioning pin inserted into the positioning hole is protruded, and a positioning portion is formed by the positioning pin and the positioning hole. . 4. A camshaft-side member comprising a rotor fixed to a camshaft, a cam pulley-side member comprising a housing fixed to a cam pulley, and a case attached to the housing and surrounding the rotor,
By supplying operating oil pressure to the advance-side hydraulic chamber and the retard-side hydraulic chamber formed between the case and the vanes protruding from the rotor, the rotational phase of the cam pulley-side member and the camshaft-side member is changed. 4. The engine valve timing changing device according to claim 1, further comprising a valve timing changing mechanism configured to change the valve timing.