JP3963210B2 - Valve timing control device for internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a valve timing control device for an internal combustion engine and a transportation method thereof.
[0002]
[Background Art and Problems to be Solved by the Invention]
Conventionally, when detecting a crank angle or a cam angle in a valve timing control device, a sensor plate (also referred to as a target plate or timing teeth) as a detection device and a detection medium is provided on the front end side of the device due to the mounting space. It is considered.
[0003]
Also provided is a restraining means having a lock pin (lock member) provided slidably on the vane rotor and an insertion hole provided in the housing so that the lock pin can be inserted and engaged with the lock pin. A technique is known in which the vane rotor is restrained at a predetermined position such as the most retarded angle position to prevent fluttering of the vane rotor at a low pressure. In this technique, it is known that it is preferable to move the lock pin parallel to the rotation axis so that the lock pin accommodated in the vane rotor is not affected by the centrifugal force. In other words, in this configuration, by providing the lock pin lock hole on the camshaft side of the housing, the distance between the lock pin and the camshaft is reduced, and the lock pin swing is reduced, so that the stroke required for unlocking the lock pin is reduced. The amount is reduced and the unlocking operation becomes easy.
Further, in such a conventional technique, generally, the lock pin is assembled from the side opposite to the camshaft in the housing, and the fixing bolt for fixing the housing body and the sealing member is assembled from the camshaft side. However, in this structure, the assembly work is performed on both sides of the housing, so there is a problem with the assembly, and in order to ensure ease of assembly, the assembly direction of the lock pin and the fixing bolt is fixed. It is hoped that.
[0004]
In addition, in order to solve all of these problems in a limited dimension range in the axial direction, a sensor plate is provided on the front end side of the housing (opposite side of the camshaft), and a fixing bolt is inserted from the front end side. In such a case, if a hexagonal bolt having a square bolt cross section is used, the sensor may erroneously determine that the bolt head is a sensor plate. Therefore, in order to prevent this erroneous detection, it is necessary to dispose the sensor plate away from the housing and the fixing bolt, and the axial dimension of the apparatus becomes large, and the vehicle mountability deteriorates.
[0005]
The present invention has been made by paying attention to the above-mentioned conventional problems, and can prevent sensor misdetection simultaneously with shortening the axial dimension and ensuring ease of assembly. It is an object of the present invention to provide a valve timing control device for an internal combustion engine.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1
A rotation transmission member for transmitting rotation from a drive shaft of the internal combustion engine;
A housing having a housing body fixed to one of the rotation transmission member and the camshaft and having a working chamber space therein and a sealing member for sealing the working chamber space;
A fixing bolt for fixing the said sealing member and the housing body,
A vane rotor which said working chamber is accommodated in the space, have a vane protruding radially, is fixed to the other of the cam shaft and the rotation transmitting member,
Between the vane rotor and the housing, wherein the forming the advance chamber or retard chamber defined by the vanes, at least one pressure chamber which supply and discharge of fluid is performed to the advanced angle chamber or the retarded angle chamber When,
The vane rotor within movably held in the direction of the rotation axis of the vane rotor, the restraint by moving the rotational phase between the vane rotor and the housing to allow a distal end side restraint by moving the camshaft is released A restraining member
Fixed to one of the distal end of the said vane rotor housing, a sensor plate for detecting the rotation angle of the cam shaft,
A sensor for detecting the rotation of the sensor plate disposed in the axial direction so as to face the front surface of the sensor plate;
The fixing bolts, between the sensor plate and the housing, is inserted and fixed toward the camshaft side from the front end side, cross-sectional shape of the head of the fixing bolt, the tip end is smaller than the proximal end side, It is a means characterized in that it is formed in a shape having a side surface that becomes wider as it goes away from the tip.
[0007]
According to a second aspect of the present invention, there is provided the valve timing control device for an internal combustion engine according to the first aspect,
A restraining means including a lock member provided to be slidable in the axial direction of the vane rotor, and an insertion hole provided in the housing through which the lock member can enter and exit, wherein the lock member is provided in the insertion hole. It is switched between the inserted restraint state and the non-restraint state in which the lock member is not inserted into the insertion hole,
The insertion hole is provided on the camshaft side of the housing, and the lock member is configured to be insertable from a side to which the sealing member is fixed .
[0008]
The invention according to claim 3 is the valve timing control device for an internal combustion engine according to claim 1 or 2,
The fixing bolt is a button bolt .
According to a fourth aspect of the present invention, there is provided the valve timing control device for an internal combustion engine according to any one of the first to third aspects, wherein the sensor is based on a peak of a detection signal of the fixed bolt. An output signal having a high peak of the detection signal of the plate is output.
[0009]
Operation and effect of the invention
In the present invention, the fixing bolt for fixing the housing main body and the sealing member is formed into a shape having a side surface that has a cross-sectional shape of the head portion that is smaller at the distal end side than the proximal end side and becomes wider as it is separated from the distal end side. Even if the structure has a structure in which the fixing bolt is provided between the sensor plate and the housing and the axial dimension is suppressed, the fixing bolt can be used as a sensor. The effect of not erroneously detecting the plate is obtained.
In particular, in the present invention, a high misjudgment prevention effect can be obtained in a configuration having a sensor that detects the rotation of the sensor plate arranged in the axial direction so as to face the front end surface of the sensor plate .
In the invention according to claim 2 , since the insertion direction of the lock member as the restraining means and the fixing bolt is the same, the effect that high assemblability is obtained can be obtained simultaneously with the above effect.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
The valve timing control apparatus for an internal combustion engine according to the embodiment corresponds to the invention described in claims 1, 3, and 4 .
[0011]
FIG. 1 is a transverse sectional view showing a valve timing control device for an internal combustion engine according to an embodiment, and FIG. 2 is a longitudinal sectional view thereof.
In FIG. 1, 2 is a camshaft. This camshaft 2 opens and closes at least one of an intake valve and an exhaust valve (not shown).
[0012]
The camshaft 2 receives driving force from the housing 1.
The housing 1 has a cylindrical housing body 4, a function as a sealing member that closes the camshaft 2 side of the housing body 4, and a function as a rotation transmission member that receives rotation input from an engine (not shown). The sprocket 3 is constituted by a front plate 5 as a sealing member that closes the opposite side of the housing body 4 from the camshaft 2.
[0013]
The sprocket 3 is rotated in synchronism with the crankshaft when a driving force is transmitted from a crankshaft as an engine drive shaft (not shown) through a chain (not shown). As a member for transmitting power from the engine drive shaft, a chain, a belt, a gear, or the like can be used. As a member for transmitting rotation from these, the belt is driven by a belt in addition to the illustrated sprocket. A gear driven by pulleys or gears can be considered.
[0014]
Bolt holes 3b for fastening fixing bolts 13 are formed in the sprocket 3, and bolt insertion holes 4b and 5b are formed in the housing body 4 and the front plate 5 coaxially with the respective bolt holes 3b. . Therefore, the sprocket 3, the housing body 4, and the front plate 5 are integrally clamped and fixed coaxially by inserting the fixing bolt 13 through the bolt insertion holes 4 b and 5 b and fastening them to the bolt holes 3 b. .
In the example shown in the figure, the sprocket 3 also serves as a member that closes the camshaft 2 side of the housing 1. However, the rotation transmission member may be provided anywhere on the housing 1. It may be provided on the opposite side of the front plate 5 side or the outer periphery of the housing body 4.
[0015]
A vane rotor 6 is coaxially provided in the housing 1 so as to be relatively rotatable. The vane rotor 6 is fixed to the tip of the camshaft 2 by a bolt 17.
The vane rotor 6 includes a rotor portion 61 having a substantially cylindrical shape in an axial center portion, a vane 62 that protrudes from the rotor portion 61 in the outer diameter direction, and an integrally provided vane rotor 62. A through-hole 65 through which the bolt 17 passes and an accommodation hole 67 for accommodating the head of the bolt 17 are provided. In addition, a seal member 66 is attached to the front end surface of each vane 62.
On the other hand, as shown in FIG. 2, four space portions (corresponding to pressure chambers in the claims) 41 are formed in the housing body 4. In each space portion 41, the vane 62 is accommodated, and an advance chamber 81 and a retard chamber 82 are formed on both sides in the circumferential direction with the vane 62 interposed therebetween.
Therefore, when the hydraulic fluid is supplied to the advance chamber 81 and the hydraulic fluid is discharged from the retard chamber 82, the vane rotor 6 rotates relative to the housing body 4 in the direction of expanding the volume of the advance chamber 81. As a result, the camshaft 2 rotates relative to the sprocket 3 in the advance direction.
On the other hand, when the hydraulic fluid is supplied to the retard chamber 82 and the hydraulic fluid is discharged from the advance chamber 81, the vane rotor 6 rotates relative to the housing body 4 in the direction of expanding the volume of the retard chamber 82. As a result, the camshaft 2 rotates relative to the sprocket 3 in the retarding direction.
[0016]
A seal member 44 that defines an advance chamber 81 and a retard chamber 82 is provided on the inner periphery of the housing 4.
In the illustrated example, the sprocket 3 also serves as a member that seals the advance chamber 81 and the retard chamber 82 in the housing 1, but the rotation transmission member is a member that seals both the chambers 81 and 82. May be formed completely separately.
In the illustrated example, four pairs of the advance chamber 81 and the retard chamber 82 are formed. However, these pairs are not limited to four pairs, as long as at least one pair is formed.
[0017]
The hydraulic fluid is supplied to and discharged from the advance chamber 81 and the retard chamber 82 by an electromagnetic proportional valve and a pump (not shown).
The structure for supplying and discharging the hydraulic fluid will be described. The shaft member 7 is inserted into the accommodation hole 67. The shaft member 7 is formed with an advance side circuit 72 and a retard side circuit 73 through which hydraulic fluid is supplied and discharged from an electromagnetic proportional valve (not shown) via an oil passage member 71.
Further, one outer side sealing material 74 and two inner side sealing materials 75 are mounted on the outer periphery of the shaft member 7, the retard side communication chamber 76 formed on the distal end side of the shaft member 7, and both the sealing materials 74. , 75 and an advance side communication chamber 77 is formed. The advance side communication chamber 77 is connected to the advance chamber 81 through a communication hole 6f formed in the radial direction in the vane rotor 6 shown in FIG. 2, and the retard side communication chamber 76 is also formed in the same radial direction. The hole 6 s is connected to the retard chamber 82, so that hydraulic fluid can be supplied to and discharged from the advance chamber 81 and the retard chamber 82 by switching an electromagnetic proportional valve (not shown).
The pump may be an oil pump used for lubricating the internal combustion engine or a dedicated pump.
[0018]
Further, in the present embodiment, when the electromagnetic proportional valve and the pump are in the non-operating state, the most retarded angle position that is a predetermined position (position where the vane rotor 6 is disposed when the engine is started) with respect to the housing 1. Constraint means 9 is provided for holding.
The restraining means 9 includes a lock pin 91 and a lock hole member 92 as lock members.
The lock pin 91 is slidably supported in a sliding hole 63 formed in one of the vanes 62 of the vane rotor 6 in the axial direction. A communication groove 69 is formed on the end face of the vane rotor 6 so that the sliding hole 63 is always in communication with the outside and the pressure is released when the lock pin 91 slides. One end of the communication groove 69 is connected to the sliding hole 63, and the other end extends to the axial center side from the inner peripheral end of the inner peripheral hole 51 formed in the axial center portion of the front plate 5. Communication with the outside is performed through the inner peripheral hole 51.
[0019]
On the other hand, the sprocket 3 is formed with a circular locking hole 3h. The locking hole 3h has an insertion hole 92h having an inner diameter through which the lock pin 91 can be inserted with a material having a hardness higher than that of the sprocket 3. The lock hole member 92 formed in the bottomed cylindrical shape is tightly fitted.
Therefore, as shown in FIG. 3, when the lock pin 91 is inserted into the lock hole member 92, the sprocket 3 and the vane rotor 6 are in a state in which relative rotation is impossible. The state in which the lock pin 91 is inserted into and engaged with the insertion hole 92h of the lock hole member 92 in this way is referred to as a restrained state, and the state in which the lock pin 91 is detached from the insertion hole 92h of the lock hole member 92 and is not engaged. It will be referred to as an unconstrained state.
Moreover, although the cylindrical lock pin 91 is shown as the lock member, the shape is not limited to the cylindrical shape, and may be a polygonal shape. Further, the lock pin 91 has a distal end portion with a throttle shape to prevent contamination from being caught, but the shape is not limited to such a shape.
In addition, the lock hole member 92 has a bottomed cylindrical shape in the illustrated example, but is not limited to a bottomed cylindrical shape, and may have a ring shape.
[0020]
Switching between the restraining state and the unconstraining state of the lock pin 91 is performed by the hydraulic pressure supplied to the return spring 94 and both chambers 81 and 82.
That is, the lock pin 91 is formed in a cylindrical shape having a hole 91h, and a flange 91f is formed at the base end portion. On the other hand, the sliding hole 63 formed in the vane rotor 6 is formed with a stepped portion that engages with the flange 91f of the lock pin 91, and has an outer diameter that is substantially the same as the inner diameter of the sliding hole 63. A retainer 93 having a head portion 93h that is abutted against the front plate 5 and a shaft portion 93r that is inserted into the hole 91h of the lock pin 91 is provided.
[0021]
A return spring 94 is provided between the head 93h of the retainer 93 and the bottom of the hole 91h to urge the lock pin 91 in the restrained state.
Further, the lock pin 91 is formed in a stepped shape in the flange 91f as shown in the figure, and although not shown, the fluid pressure in the retard chamber 82 is supplied to the flange 91f, and the lock pin 91 When the fluid pressure of the advance chamber 81 is supplied to the tip of 91 and the fluid pressure is supplied to one of the chambers 81 and 82, the lock pin 91 resists the urging force of the return spring 94 and the lock pin 91 is It is configured to stroke.
[0022]
Therefore, when the pump is not driven and no pressure is supplied to the chambers 81 and 82, no pressure is applied to the lock pin 91, and the lock pin 91 is biased in the restrained state by the biasing force of the return spring 94. Is done. Therefore, when the vane rotor 6 is disposed at the most retarded position, the tip end portion of the lock pin 91 is inserted into the lock hole member 92 as shown in FIG. 1, and the relative rotation between the vane rotor 6 and the sprocket 3 is restricted. Is done.
When the engine (not shown) is driven and pressure is generated in the pump, and when hydraulic pressure is supplied from the electromagnetic proportional valve 20 to the advance chamber 81 or the retard chamber 82, the lock pin 91 is connected to the return spring 94. Slides to the unlock position against the urging force.
In addition, as a means for releasing the lock between the lock pin 91 and the lock hole member 92, in the illustrated example, the one performed by hydraulic pressure is shown, but not limited to this, other means such as electromagnetic force are used. You may use what is engaged / disengaged.
[0023]
In the vane rotor 6, a sensor plate 100 is fixed substantially parallel to the front plate 5 on a shaft portion 68 protruding from an inner peripheral hole 51 opened in the shaft center portion of the front plate 5.
3A and 3B show the sensor plate 100, in which FIG. 3B is a front view and FIG. 3A is a sectional view taken along the line Sa-Sa in FIG.
As shown in the figure, the sensor plate 100 includes a ring member 101 fixed to the shaft portion 68 and four arm portions 102 protruding from the ring member 101 in the outer diameter direction.
[0024]
As shown in FIG. 1, the fixing bolt 13 is formed such that the axial dimension L (see FIG. 4) of the head 13h does not interfere with the sensor plate 100 when tightened and fixed. 4, the area of the tip surface 13t is smaller than the area of the base portion 13b, and the cross-sectional shape is curved so that the area gradually increases from the tip surface 13t toward the base portion 13b. A so-called button bolt formed is used. In short, as the fixing bolt 13, the cross-sectional shape of the head portion 13 h is not a substantially square shape like a hexagonal bolt, but the area is widened from the distal end side toward the proximal end portion, and a right angle or acute angle is formed at the distal end portion. If it is a shape which does not have a corner | angular part, you may use the thing of cross-sectional shapes, such as a substantially semicircle shape and a substantially trapezoid shape, for example.
[0025]
A sensor 110 such as an electromagnetic pickup is provided so that the detection unit 111 faces the tip surface of the arm 102 of the sensor plate 100. The sensor 110 outputs a signal when a metal edge passes in front of the detection unit 111.
[0026]
FIG. 5 shows the output of the sensor 110. FIG. 5A shows a signal when only the hexagon bolt passes in the configuration in which the hexagon bolt is fastened to the front plate 5. FIG. 5B shows the fixing bolt 13. (C) is a signal when only the arm portion 102 of the sensor plate 100 is passed, and (d) is a hexagon in place of the fixing bolt 13 of the embodiment. The signal when the hexagonal bolt and the arm portion 102 of the sensor plate 100 pass in the configuration in which the bolt is provided, FIG. 5 (e) shows the fixing bolt 13 and the arm portion 102 of the sensor plate 100 in the valve timing control device of the embodiment. Shows the signal when.
[0027]
As described above, in the present embodiment, since the shape of the head 13h of the fixing bolt 13 for tightening the housing 1 is formed in a shape having no edge at the tip, the peak PB of the signal for detecting the fixing bolt 13 and The difference E between the peak PP of the signal for detecting the arm portion 102 of the sensor plate 100 is larger than the difference D between the peak P6 of the signal for detecting the hexagon bolt and the peak PP of the signal for detecting the arm portion 102. .
Therefore, in the present embodiment, it is difficult to erroneously detect the fixing bolt 13 as the arm portion 102 of the sensor plate 100 as compared with the case where a hexagon bolt is used as the fixing bolt 13.
[0028]
Further, in the present embodiment, as described in the prior art, the position where the lock pin 91 is slid in the axial direction and the insertion hole 92h is engaged is the position close to the camshaft 2, and the lock pin 91 is locked. The pin 91 is not easily affected by the centrifugal force, and the unlocking operation is easy.
Further, the assembly direction of the lock pin 91, the fixing bolt 13, and the sensor plate 100 is common, and the assembly workability is excellent.
Further, the fixing bolt 13 is provided on the same side as the sensor plate 100 as described above, and as the fixing bolt 13, a button bolt having a shape in which the shape of the head portion 13h gradually increases in cross-sectional area from the distal end surface 13t toward the base portion 13b. Therefore, the distance between the front plate 5 and the sensor plate 100 can be suppressed and the axial dimension of the entire apparatus can be reduced.
[0029]
As described above, in the valve timing control apparatus for an internal combustion engine according to the present embodiment, assembling is facilitated by assembling the lock pin 91, the fixing bolt 13, and the sensor plate 100 from the same direction of the housing 1. As a result, it is possible to achieve both the securing of the axial dimension of the apparatus and the prevention of erroneous detection by the sensor 110.
[0030]
The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and even if there is a design change without departing from the gist of the present invention. It is included in the present invention.
For example, in the embodiment, the example in which the sensor plate is fixed to the vane rotor has been described. In short, the sensor plate may be provided on a member integrated with the camshaft, and the camshaft is coupled to the housing. In the configuration, the sensor plate may be fixed to the housing. That is, the rotation transmission member is coupled to one of the housing and the vane rotor, and the camshaft is coupled to the other. Therefore, in the configuration in which the rotation transmission member is coupled to the vane rotor, the camshaft is coupled to the housing.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a valve timing control device for an internal combustion engine according to an embodiment.
FIG. 2 is a longitudinal sectional view showing a valve timing control device for an internal combustion engine according to the embodiment.
FIGS. 3A and 3B are a cross-sectional view and a front view showing a sensor plate in the valve timing control apparatus for an internal combustion engine according to the embodiment; FIGS.
FIG. 4 is a side view showing a fixing bolt in the valve timing control apparatus for an internal combustion engine according to the embodiment.
FIG. 5 is an output characteristic diagram showing an output of a sensor in the valve timing control apparatus for an internal combustion engine according to the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing 2 Camshaft 3 Sprocket 3b Bolt hole 3h Locking hole 4 Housing main body 4b Bolt insertion hole 5 Front plate 5b Bolt insertion hole 6 Vane rotor 6f Communication hole 6s Communication hole 7 Shaft member 9 Restricting means 13t Tip surface 13 Fixing bolt 13b Base 13h Head 17 Bolt 20 Proportional solenoid valve 41 Space 44 Seal member 51 Inner peripheral hole 61 Rotor 62 Vane 63 Sliding hole 65 Through hole 66 Sealing member 67 Housing hole 68 Shaft 69 Communication groove 71 Oil passage member 72 Advance angle Side circuit 73 Delay side circuit 74 Outer seal material 75 Inner seal material 76 Delay angle side communication chamber 77 Advance angle side communication chamber 81 Advance angle chamber 82 Delay angle chamber 91f Flange 91 Lock pin 91h Hole 92 Lock hole member 92h Insert hole 93 Retainer 93r Shaft 93h Head 94 Return spring 100 Sensor play 101 ring member 102 arm 110 sensor 111 detection unit

Claims (4)

A rotation transmission member for transmitting rotation from a drive shaft of the internal combustion engine;
A housing having a housing body fixed to one of the rotation transmission member and the camshaft and having a working chamber space therein and a sealing member for sealing the working chamber space;
A fixing bolt for fixing the said sealing member and the housing body,
A vane rotor which said working chamber is accommodated in the space, have a vane protruding radially, is fixed to the other of the cam shaft and the rotation transmitting member,
Between the vane rotor and the housing, wherein the forming the advance chamber or retard chamber defined by the vanes, at least one pressure chamber which supply and discharge of fluid is performed to the advanced angle chamber or the retarded angle chamber When,
The vane rotor within movably held in the direction of the rotation axis of the vane rotor, the restraint by moving the rotational phase between the vane rotor and the housing to allow a distal end side restraint by moving the camshaft is released A restraining member
Fixed to one of the distal end of the said vane rotor housing, a sensor plate for detecting the rotation angle of the cam shaft,
A sensor for detecting the rotation of the sensor plate disposed in the axial direction so as to face the front surface of the sensor plate;
The fixing bolts, between the sensor plate and the housing, is inserted and fixed toward the camshaft side from the front end side, cross-sectional shape of the head of the fixing bolt, the tip end is smaller than the proximal end side, A valve timing control device for an internal combustion engine, characterized in that the valve timing control device is formed in a shape having a side surface that becomes wider as it goes away from the tip. A restraining means including a lock member provided to be slidable in the axial direction of the vane rotor, and an insertion hole provided in the housing through which the lock member can enter and exit, wherein the lock member is provided in the insertion hole. It is switched between the inserted restraint state and the non-restraint state in which the lock member is not inserted into the insertion hole,
2. The internal combustion engine according to claim 1, wherein the insertion hole is provided on the camshaft side of the housing, and the lock member is configured to be insertable from a side on which the sealing member is fixed . Valve timing control device. The valve timing control device for an internal combustion engine according to claim 1 or 2, wherein the fixing bolt is a button bolt . 4. The internal combustion engine according to claim 1, wherein the sensor outputs an output signal in which a peak of the detection signal of the sensor plate is higher than a peak of the detection signal of the fixing bolt. 5. Valve timing control device.

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