JP2010168982A - Changeover valve drive mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save a space in an internal combustion engine on which a valve characteristic adjusting device is mounted. <P>SOLUTION: In a valve timing control device 2 serving as the valve characteristic adjusting device, the solenoid 20 of the changeover valve drive mechanism is stored and fixed in a valve camshaft. Therefore, in the internal combustion engine on which the valve timing control device 2 having the changeover valve drive mechanism is mounted, the solenoid 20 is not exposed to the outside, and the space can be sufficiently saved. Since the solenoid 20 is rotated integrally with the valve timing control device 2, a configuration for transmitting a movement force between the plunger 20b and the spool 18b of the solenoid 20 can be easily provided with high flexibility. Consequently, even an internal combustion engine having the valve timing control device 2 can be easily laid horizontally in a vehicle. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a switching valve drive mechanism in a valve characteristic adjusting device that adjusts a valve characteristic of an internal combustion engine by switching a pressure supply state of a working fluid with a switching valve.

  As a valve characteristic adjusting device for an internal combustion engine, for example, a device that controls valve timing by making the relative rotational phase relationship between a crankshaft and a valve camshaft variable is known (for example, Patent Documents 1 and 2). reference).

  In an internal combustion engine equipped with such a variable valve timing device, an actuator or a variable valve timing device is arranged on the valve camshaft on the side opposite to the cam sprocket and the cam pulley in order to improve the vehicle mountability.

Japanese Patent Laying-Open No. 2005-69227 (page 17, FIG. 9) Japanese Utility Model Publication No. 3-122205 (pages 10-13, FIG. 1)

  By arranging the actuator and variable valve timing device as described above, it is possible to provide a margin on the front side of the internal combustion engine, but the increased margin on the front side has moved as a necessary space on the rear side. However, it has not been saved enough.

  An object of the present invention is to enable sufficient space saving in an internal combustion engine equipped with a valve characteristic adjusting device.

In the following, means for achieving the above object and its effects are described.
A switching valve drive mechanism according to claim 1 is a switching valve drive mechanism in a valve characteristic adjusting device that adjusts a valve characteristic of an internal combustion engine by switching a pressure supply state of a working fluid by means of a switching valve. A rotating shaft space formed at the rotating shaft position, a coil and a movable core are provided and fixed in the inner peripheral surface of the rotating shaft space in a state of being accommodated in the rotating shaft space, An actuator for moving the movable core by the generated magnetic force to drive the valve body of the switching valve and a power supply means for supplying power to the coil from the outside of the valve camshaft are provided.

  In the valve characteristic adjusting device, the actuator of the switching valve drive mechanism is housed in the rotating shaft space of the valve camshaft and fixed to the inner peripheral surface thereof. In such a stored state, power is supplied to the coil by the power supply means, so that magnetic force is applied from the coil to the movable core, and the valve body of the switching valve is driven by the movement of the movable core.

  The valve characteristic adjusting device that functions as described above and adjusts the valve characteristic is in a state where the actuator in the switching valve drive mechanism is housed inside the valve camshaft as described above. Therefore, the internal combustion engine equipped with the valve characteristic adjusting device having this switching valve drive mechanism can achieve a sufficient space saving.

  According to a second aspect of the present invention, the switching valve drive mechanism according to the first aspect is characterized in that the coil of the actuator is fixed to the inner peripheral surface of the rotation shaft space.

The actuator can be fixed in the rotation axis space of the valve camshaft by fixing the coil to the inner peripheral surface of the rotation axis space.
According to a third aspect of the present invention, in the switching valve driving mechanism according to the first or second aspect, the valve characteristic adjusting device is attached to one end of a valve camshaft.

  Thus, when the valve characteristic adjusting device is attached to one end of the valve camshaft, the actuator housed and fixed in the rotation shaft space formed at the rotation shaft position of the valve camshaft is: It rotates together with the valve characteristic adjusting device via the valve camshaft. For this reason, transmission of the driving force between the movable core of the actuator and the valve body of the switching valve can be realized with a simple configuration and a high degree of freedom.

  In the switching valve drive mechanism according to claim 4, in the switching valve drive mechanism according to any one of claims 1 to 3, the switching valve includes a sleeve and a spool disposed in an internal space of the sleeve. The spool valve is provided.

A spool valve can be used as the switching valve. The valve supply characteristic of the internal combustion engine can be adjusted by easily switching the pressure supply state according to the moving position of the spool within the sleeve.
In the switching valve drive mechanism according to claim 5, in the switching valve drive mechanism according to any one of claims 1 to 4, the actuator is configured as a solenoid that linearly moves the movable core in the axial direction. It is characterized by being.

A solenoid can be used as the actuator, and it can be driven easily even in the rotation axis space of the valve camshaft.
According to a sixth aspect of the present invention, in the switching valve driving mechanism according to any one of the first to fifth aspects, the valve characteristic adjusting device adjusts a valve timing of the internal combustion engine. It is characterized by.

  Examples of the valve characteristic adjusting device include one that adjusts the valve timing of the internal combustion engine. A sufficient space can be saved in an internal combustion engine equipped with such a valve timing adjusting device.

  In the switching valve drive mechanism according to claim 7, in the switching valve drive mechanism according to any one of claims 1 to 6, the power supply means is configured to supply power to the coil via a slip ring. It is characterized by.

Since the actuator side rotates together with the valve camshaft, the power supply means can supply power to the coil of the actuator via the slip ring.
9. The switching valve drive mechanism according to claim 8, wherein the power feeding means is attached to an internal combustion engine body side and extends to the coil through the rotation shaft space. And a slip ring arranged between the support member and the coil.

  By arranging the slip ring between the coil and the support member that extends through the rotation axis space of the valve camshaft to the coil, power can be supplied to the rotating coil from the tip of the non-rotating support member.

  The switching valve drive mechanism according to claim 9, wherein in the switching valve drive mechanism according to claim 7, the power feeding means is attached to the coil side or the inner peripheral surface side of the valve camshaft, and the rotary shaft space is provided. The slip ring is disposed between the support member and the internal combustion engine main body side.

  The slip ring can supply power to the support member rotating from the internal combustion engine body side by being disposed between the support member rotating together with the coil and the valve camshaft and the internal combustion engine body side. Further, power can be easily supplied to the coil that is relatively stopped from the support member.

  The switching valve drive mechanism according to claim 10 is the switching valve drive mechanism according to any one of claims 1 to 9, wherein the valve camshaft provided with the rotation shaft space includes an intake valve camshaft and an exhaust valve. It is one or both of the valve camshaft and the valve camshaft.

  As described above, the actuator may be disposed on one of the intake valve cam shaft and the exhaust valve cam shaft, or may be disposed on both of them. This makes it possible to adjust the valve characteristics of the internal combustion engine even when the valve characteristic adjusting device is applied to one or both of the intake valve cam shaft and the exhaust valve cam shaft, and as described above, sufficient space saving is possible. It can be.

The switching valve drive mechanism according to claim 11 is the switching valve drive mechanism according to any one of claims 1 to 10, wherein the internal combustion engine is for driving a vehicle.
By applying the valve characteristic adjusting device having the switching valve drive mechanism described above to the internal combustion engine for driving the vehicle in this way, the internal combustion engine can adjust the valve characteristic, and as described above, sufficient space saving is achieved. Can be made possible. For this reason, it can contribute to size reduction and weight reduction of a vehicle, and can improve a fuel consumption.

According to a twelfth aspect of the present invention, the switching valve drive mechanism according to the eleventh aspect is characterized in that the internal combustion engine is a horizontal type.
When the internal combustion engine is a horizontal type in a vehicle, it tends to be difficult to secure the left and right spaces in the vehicle due to the presence of the valve characteristic adjusting device. As a result, the valve characteristics can be adjusted, and the arrangement is facilitated by sufficient space saving.

1 is a schematic configuration diagram illustrating a valve characteristic adjusting device for an internal combustion engine and a switching valve drive mechanism thereof according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. The schematic block diagram which shows the valve characteristic adjustment apparatus of the internal combustion engine of Embodiment 2, and its switching valve drive mechanism. FIG. 5 is a schematic configuration diagram showing a valve characteristic adjusting device for an internal combustion engine and a switching valve drive mechanism thereof according to a third embodiment. FIG. 6 is a schematic configuration diagram showing a valve characteristic adjusting device for an internal combustion engine and a switching valve drive mechanism thereof according to a fourth embodiment. FIG. 6 is a schematic configuration diagram showing a valve characteristic adjusting device for an internal combustion engine and a switching valve drive mechanism thereof according to a fifth embodiment. FIG. 10 is a schematic configuration diagram showing a valve characteristic adjusting device for an internal combustion engine and a switching valve drive mechanism thereof according to a sixth embodiment.

[Embodiment 1]
FIG. 1 is a schematic configuration diagram showing a valve characteristic adjusting device of an internal combustion engine to which the above-described invention is applied and a switching valve driving mechanism thereof. FIG. 2 is a cross-sectional view of an essential part of the AA line. The valve characteristic adjusting device is embodied as the valve timing control device 2 in the present embodiment. The internal combustion engine is for driving the vehicle, and the internal combustion engine in the vehicle is a horizontal type that is disposed in the horizontal direction.

  The valve timing control device 2 is integrally incorporated in each valve camshaft 4 of the intake valve and the exhaust valve. Although one of these two valve camshafts 4 is shown in FIG. 1, the other has the same configuration. 1 is supported on the cylinder head 6 by the journal bearing 6a and the cam cap 6b so as to be rotatable in a parallel state.

  A variable valve timing mechanism 8 in the valve timing control device 2 is attached to the front tip side of the valve camshaft 4. The variable valve timing mechanism 8 includes a housing 10 and an internal rotor 12 disposed in the housing 10. The internal rotor 12 is fixed to the front end of the valve camshaft 4 and rotates together with the valve camshaft 4.

  Cam sprocket teeth 10a are formed on the outer periphery of the housing 10 to function as a timing sprocket. Two protrusions 10 c are provided on the inner peripheral surface 10 b of the housing 10 toward the inner space, and the tip end surface 10 d is slidably adhered to the outer peripheral surface 12 a of the inner rotor 12.

  Two vanes 12b protrude from the outer peripheral surface 12a of the inner rotor 12, and the front end surfaces 12c are slidably adhered to the inner peripheral surface 10b of the housing 10. As a result, two retard-side hydraulic chambers 14 and two advance-side hydraulic chambers 16 are formed between the housing 10 and the internal rotor 12.

  A retard side oil passage 14a and an advance side oil passage 16a for supplying and discharging hydraulic oil (corresponding to a working fluid) to and from these hydraulic chambers 14 and 16 are formed from the central axis side of the inner rotor 12 and opened. is doing. A spool valve 18 as a switching valve is disposed at the central axis position of the internal rotor 12. The spool valve 18 includes a sleeve 18a, a spool 18b, and a spring, and changes the position of the spool 18b as a valve body in the sleeve 18a in the axial direction against the urging force of the spring or by the urging force of the spring. With this, it is possible to easily switch the communication / non-communication state of each port formed in the sleeve 18a. By switching between the communication state and the non-communication state of each port, the hydraulic pressure supply state to the hydraulic chambers 14 and 16 is switched via the retarded angle side oil passage 14a and the advanced angle side oil passage 16a. Then, the hydraulic oil is supplied and discharged, and the advance angle / retard angle of the variable valve timing mechanism 8 is adjusted.

  The variable valve timing mechanism 8 is rotated in the R direction in FIG. 2 by the crankshaft of the internal combustion engine via a chain. When hydraulic oil is supplied to the retarded hydraulic chamber 14 and discharged from the advanced hydraulic chamber 16, the internal rotor 12 rotates relative to the housing 10 in the L direction in FIG. The phase difference between 12 and the housing 10 changes. Therefore, the rotational phase of the cam 4a of each cylinder provided on the valve camshaft 4 is retarded with respect to the crankshaft, and the valve timing is retarded. When the hydraulic oil is discharged from the retarded hydraulic chamber 14 and supplied to the advanced hydraulic chamber 16, the internal rotor 12 rotates relative to the housing 10 in the R direction in FIG. The phase difference from the housing 10 changes. Therefore, the rotational timing of the cam 4a of each cylinder provided on the valve camshaft 4 is advanced with respect to the crankshaft, and the valve timing is advanced.

  The valve cam shaft 4 is formed in a pipe shape, and a rotation shaft space 4b is formed at the rotation shaft position. A solenoid 20 is accommodated as an actuator in the rotating shaft space 4b. The solenoid 20 has a coil 20a and a plunger 20b disposed in the inner space of the coil 20a so as to be movable in the axial direction. The coil 20a is fixed to the inner peripheral surface 4c of the rotary shaft space 4b with respect to the valve camshaft 4. As a result, the solenoid 20 is housed in the rotation shaft space 4b of the valve camshaft 4 and rotates integrally with the valve camshaft 4.

  On the base end side of the coil 20a, two concentric rings made of a conductor and one side (here, a ring) of a slip ring 20c made of a combination of a brush and a brush spring are formed. The other side of the slip ring 20c (here, the brush and the brush spring) is provided in an insulated state on the support member 22 side as a power feeding means.

  The support member 22 is supported on a cylinder head 6 corresponding to the internal combustion engine main body side. The support member 22 includes a support base 22a that constitutes a part of the cylinder head 6, a support arm 22b that passes through the rotation shaft space 4b of the valve camshaft 4, and a disk-like shape provided at the tip of the support arm 22b. Slip ring base portion 22c and two conductors 22d that connect the brush of slip ring 20c and an external energization control portion are provided.

  The two conducting wires 22d are disposed in an insulated state with respect to the slip ring base portion 22c, the support arm 22b, and the support base 22a, and are connected to an external energization control portion. However, of the two conductors 22d, the ground-side conductor is electrically connected at any position of the support member 22 if the support member 22 is sufficiently in electrical conduction with the energization control unit. Therefore, it is not necessary to arrange the energization control unit. Alternatively, the ground-side conductor of the two conductors 22d may be omitted by directly connecting the ground-side brush of the slip ring 20c to the slip ring base portion 22c.

  The spool valve 18 disposed at the center axis position of the internal rotor 12 of the variable valve timing mechanism 8 has the proximal end side of the spool 18b in contact with or connected to one end of the plunger 20b of the solenoid 20. As a result, the solenoid 20 moves the plunger 20b in the rotating shaft space 4b of the valve camshaft 4 by the magnetic force generated in the coil 20a in accordance with the power supply state from the power supply control unit via the slip ring 20c, and the spool 20 The axial position of 18b can be easily adjusted. As a result of this adjustment, as described above, the advance angle / retard angle of the variable valve timing mechanism 8 is adjusted by switching between the communication state and the non-communication state of each port. Here, the rotation shaft space 4b, the solenoid 20, and the support member 22 correspond to a switching valve drive mechanism.

  The supply of the hydraulic oil to the spool valve 18 is performed from the journal bearing 6a (or cam cap 6b) side through the wall portion of the valve camshaft 4 as indicated by the broken line. The hydraulic oil is discharged from the spool valve 18 from the front side of the variable valve timing mechanism 8 to the outside of the housing 10 as indicated by an arrow indicated by a broken line, for example.

According to the first embodiment described above, the following effects can be obtained.
(I). As described above, the valve timing control device 2 for adjusting the valve characteristics, here, the valve timing, is in a state in which the solenoid 20 as the actuator in the switching valve drive mechanism is housed in the valve camshaft 4. Therefore, in the internal combustion engine equipped with the valve timing control device 2 having this switching valve drive mechanism, the solenoid 20 is not exposed to the outside, and sufficient space saving can be achieved.

  (B). The valve timing control device 2 is attached to one end of the valve camshaft 4. Since the solenoid 20 in the switching valve drive mechanism is housed and fixed in the rotary shaft space 4b formed at the rotary shaft position of the valve camshaft 4, the solenoid 20 performs valve timing control via the valve camshaft 4. It is rotating together with the device 2. For this reason, the transmission configuration of the moving force between the plunger 20b of the solenoid 20 and the spool 18b can be realized simply and with a high degree of freedom.

  (C). Since the valve timing control device 2 having the switching valve drive mechanism described above is applied to the internal combustion engine for driving the vehicle, the internal combustion engine can adjust the valve timing and save space as described above. can do. This can contribute to reducing the size and weight of the vehicle, and can further contribute to improving fuel efficiency.

  (D). The internal combustion engine of the present embodiment is of a horizontal type. In such a case, when the valve timing control device 2 is provided in the vehicle, securing the left and right spaces of the vehicle for arranging the solenoid 20 and the like is a transmission or the like. It tends to be difficult due to interference. However, in the present embodiment, the configuration as described above makes it easy to arrange even in an internal combustion engine that is placed horizontally and provided with the valve timing control device 2, and variable valve timing is possible.

[Embodiment 2]
A valve characteristic adjusting device (valve timing control device 102) and its switching valve drive mechanism of the present embodiment are shown in a schematic configuration diagram of FIG. In this valve timing control device 102, the support member 122 is fixed to one end of the coil 120a at the base portion 122a at the front end, and the support arm 122b penetrates the rotating shaft space 104b, and is a disc formed at the rear end. A slip ring 120c is provided on the slip ring base portion 122c. A support disc 105 is provided on the rear end side of the valve camshaft 104, and supports the support arm 122b through the central axis position.

Two conducting wires 122d extending from the coil 120a pass through the support member 122 and are connected to each ring of the slip ring 120c on the slip ring base portion 122c.
Two brushes of a slip ring 120c urged to the ring side by a spring are provided on a part 107 of the cylinder head 106 facing the ring, and a conductive wire 107a is provided from each of these brushes to the energization control unit. Has been. If the support member 122 and the cylinder head 106 are sufficiently electrically grounded, the support member 122 and the cylinder head 106 can be used in place of the lead wires, so that each of the two lead wires 122d and 107a and the slip ring can be used. One of the two rings 120c, the two brushes, and the two springs may be omitted.

  The configuration of the valve camshaft 104, the variable valve timing mechanism 108, the spool valve 118, etc. is the same as that of the first embodiment except that the support cam 105 is provided on the valve camshaft 104.

According to the second embodiment described above, the following effects can be obtained.
(I). As described above, even when the support member 122 is rotated together with the valve camshaft 104, the effect of the first embodiment is produced.

[Embodiment 3]
The valve characteristic adjusting device (valve timing control device 202) and the switching valve drive mechanism of the present embodiment are shown in the schematic configuration diagram of FIG. In this valve timing control device 202, the peripheral edge portion of the base portion 222a of the support member 222 is fixed to the inner peripheral surface 204c of the valve cam shaft 204, and the coil 220a is supported not on the inner peripheral surface 204c side of the valve cam shaft 204. The member 222 is fixed to the base 222a side. The coil 220a may be fixed to the inner peripheral surface 204c of the valve camshaft 204 together with the base 222a of the support member 222 as in the first and second embodiments.

The configuration of the valve camshaft 204, variable valve timing mechanism 208, spool valve 218, slip ring 220c, etc. is the same as that of the second embodiment.
According to the third embodiment described above, the following effects can be obtained.

  (I). The effect of the second embodiment is produced. Furthermore, since it is not necessary to support the front end side of the support member 222 on the coil 220a side, it is not necessary to increase the mechanical strength. Therefore, the configuration of the coil 220a can be simplified.

[Embodiment 4]
The valve characteristic adjusting device (valve timing control device 302) and the switching valve drive mechanism of the present embodiment are shown in the schematic configuration diagram of FIG. The valve timing control device 302 does not use a support member. The two conducting wires 322 coming out of the coil 320a are installed in an insulating state on the inner peripheral surface 304c of the valve camshaft 304 and extend rearward, and penetrate the disc 305 that closes the rotating shaft space 304b at the rear end, Each of the slip rings 320c formed on the outer surface of the disc 305 is connected to each ring.

  A rod 307 a is provided on a part 307 of the cylinder head 306, and a base 307 b formed at the tip of the rod 307 a faces the disk 305. The base 307b is provided with a brush and a spring of the slip ring 320c, and the brush is in contact with the ring on the disk 305 side by the biasing force of the spring. Conductive wires 307c are arranged from each brush to the energization control unit. If the valve camshaft 304 and the cylinder head 306 are sufficiently electrically grounded, the two lead wires 322 and 307c, respectively, can be obtained by using the valve camshaft 304 and the cylinder head 306 instead of the lead wires. One of the two rings, the two brushes, and the two springs of the slip ring 320c may be omitted.

Configurations of other parts of the valve camshaft 304, a variable valve timing mechanism 308, a spool valve 318, and the like are the same as those in the first embodiment.
According to the fourth embodiment described above, the following effects can be obtained.

(I). In addition to the effects of the first embodiment, the valve camshaft 304 also serves as a support member, so that the configuration can be simplified and reduced in weight.
[Embodiment 5]
The valve characteristic adjusting device (valve timing control device 402) and its switching valve drive mechanism of the present embodiment are shown in the schematic configuration diagram of FIG. In this valve timing control device 402, each of the two conductive wires 423 coming out of the coil 420a is installed in an insulated state on the inner peripheral surface 404c of the valve camshaft 404 and extends rearward. It is connected to each ring of a slip ring 420c provided just before the end. The slip ring 420 c is formed such that the two rings are insulated in the circumferential direction along the inner peripheral surface 404 c of the valve camshaft 404. On the other hand, two brushes provided on the support member 422 side are in contact with each other.

  The support member 422 includes a support base 422a constituting a part of the cylinder head 406, a support arm 422b supported by the support base 422a, a brush base portion 422c formed at the tip of the support arm 422b, and two The lead wire 422d is provided. A brush of the slip ring 420c and a spring for urging the brush toward the ring are provided on the outer peripheral surface of the brush base 422c, and are connected to an external energization control unit by two conductive wires 422d connected to the brush. Has been. If the valve camshaft 404, the cylinder head 406, or the support member 422 is sufficiently electrically grounded, any two or all of these may be used instead of the conductors to thereby provide two conductors 423, 422d, One of the two rings, the two brushes, and the two springs of the slip ring 420c may be omitted.

The configuration of other parts of the valve camshaft 404, the configuration of the variable valve timing mechanism 408, the spool valve 418, and the like are the same as those of the fourth embodiment.
According to the fifth embodiment described above, the following effects can be obtained.

(I). In addition to producing the effects of the first embodiment, the valve camshaft 404 also serves as a part of the support member 422, so that the configuration can be simplified and reduced in weight.
[Embodiment 6]
The valve characteristic adjusting device (valve timing control device 502) and the switching valve drive mechanism of the present embodiment are shown in the schematic configuration diagram of FIG. In this valve timing control device 502, each of the two conducting wires 523 coming out of the coil 520a is installed in an insulated state on the inner peripheral surface 504c of the valve camshaft 504 and extends rearward, and the rear end portion of the valve camshaft 504 Thus, it penetrates the outer peripheral surface 504d of the valve camshaft 504 in an insulated state. And it is connected to each ring of the slip ring 520c provided in the outer peripheral surface 504d of the valve camshaft 504. The slip ring 520c is formed in an insulating state in the circumferential direction along the outer peripheral surface 504d of the valve camshaft 504. Two brushes provided in an insulating state on the cylinder head 506 side are in contact with the two rings, respectively, by urging by a spring. And it connects with the external electricity supply control part by the two conducting wires 522d connected with the brush of the slip ring 520c. In addition, if the valve camshaft 504 and the cylinder head 506 are sufficiently electrically grounded, the two lead wires 523, 522d, One of the two rings, the two brushes, and the two springs of the slip ring 520c may be omitted.

The configuration of other parts of the valve camshaft 504, the configuration of the variable valve timing mechanism 508, the spool valve 518, and the like are the same as those of the fifth embodiment.
According to the sixth embodiment described above, the following effects can be obtained.

(I). In addition to the effects of the first embodiment, the valve camshaft 504 also serves as a support member, so that the configuration can be simplified and reduced in weight.
[Other embodiments]
(A). In each of the above-described embodiments, the actuator is a direct acting solenoid. However, even when the switching valve is a rotary switching valve that rotates the valve body, the actuator is a rotary type, and each of the above-described embodiments is used. By arranging as described above, the above-described effects can be produced.

(B). The internal combustion engine according to each of the embodiments has been described as an example of a horizontal installation type in a vehicle, but may be a vertical installation type, and this configuration can also contribute to space saving.
(C). In each of the above-described embodiments, the valve timing control device is applied to both the valve cam shafts of the intake cam and the exhaust cam. However, either one of the intake valve and the exhaust valve corresponding to the arrangement space of the internal combustion engine. However, it may be applied to the valve camshaft.

  (D). The housing in the variable valve timing mechanism of each of the above embodiments has the function of the timing sprocket with cam sprocket teeth formed, but it may be configured as a timing pulley over which a timing belt is mounted, and as a timing gear other than this good.

  DESCRIPTION OF SYMBOLS 2 ... Valve timing control apparatus, 4 ... Valve cam shaft, 4a ... Cam, 4b ... Rotary shaft space, 4c ... Inner peripheral surface, 6 ... Cylinder head, 6a ... Journal bearing, 6b ... Cam cap, 8 ... Variable valve timing mechanism DESCRIPTION OF SYMBOLS 10 ... Housing 10a ... Cam sprocket tooth | gear, 10b ... Inner peripheral surface, 10c ... Protrusion, 10d ... End surface, 12 ... Internal rotor, 12a ... Outer surface, 12b ... Vane, 12c ... End surface, 14, 16 ... Hydraulic pressure Chamber, 14a ... retard angle side oil passage, 16a ... advance angle side oil passage, 18 ... spool valve, 18a ... sleeve, 18b ... spool, 20 ... solenoid, 20a ... coil, 20b ... plunger, 20c ... slip ring, 22 ... Support member, 22a ... support stand, 22b ... support arm, 22c ... slip ring base, 22d ... conducting wire, 102 ... valve timing control device 104 ... Valve camshaft, 104b ... Rotating shaft space, 105 ... Support disk, 106 ... Cylinder head, 107 ... Part of cylinder head, 107a ... Conductor, 108 ... Variable valve timing mechanism, 118 ... Spool valve, 120a ... Coil, 120c ... slip ring, 122 ... support member, 122a ... base, 122b ... support arm, 122c ... slip ring base, 122d ... conducting wire, 202 ... valve timing control device, 204 ... valve camshaft, 204c ... inner circumference Surface 208, Variable valve timing mechanism 218 Spool valve 220a Coil 220c Slip ring 222 Support member 222a Base 302 Valve timing control device 304 Valve camshaft 304b Rotating shaft space 304c ... inner peripheral surface, 305 ... Plate, 306 ... Cylinder head, 307 ... Part of cylinder head, 307a ... Rod, 307b ... Base, 307c ... Conductor, 308 ... Variable valve timing mechanism, 318 ... Spool valve, 320a ... Coil, 320c ... Slip ring, 322 DESCRIPTION OF SYMBOLS ... Conductor, 402 ... Valve timing control device, 404 ... Valve cam shaft, 404c ... Inner peripheral surface, 406 ... Cylinder head, 408 ... Variable valve timing mechanism, 418 ... Spool valve, 420a ... Coil, 420c ... Slip ring, 422 ... Support member, 422a ... support base, 422b ... support arm, 422c ... brush base part, 422d, 423 ... conducting wire, 502 ... valve timing control device, 504 ... valve camshaft, 504c ... inner peripheral surface, 504d ... outer peripheral surface, 506 ... Cylinder head, 508 ... Variable valve Btiming mechanism, 518 ... spool valve, 520a ... coil, 520c ... slip ring, 522d, 523 ... conducting wire.

Claims (12)

A switching valve drive mechanism in a valve characteristic adjusting device that adjusts a valve characteristic of an internal combustion engine by switching a pressure supply state of a working fluid by a switching valve,
A rotation axis space formed at the rotation axis position of the valve camshaft;
The switching valve is provided with a coil and a movable core and is fixed to an inner peripheral surface of the rotation shaft space in a state of being accommodated in the rotation shaft space, and the movable core is moved by a magnetic force generated in the coil according to a power supply state. An actuator for driving the valve body,
Power supply means for supplying power to the coil from the outside of the valve camshaft;
A switching valve drive mechanism comprising: 2. The switching valve drive mechanism according to claim 1, wherein a coil of the actuator is fixed to an inner peripheral surface of the rotation shaft space. The switching valve drive mechanism according to claim 1 or 2, wherein the valve characteristic adjusting device is attached to one end of a valve camshaft. The switching valve drive mechanism according to any one of claims 1 to 3, wherein the switching valve is a spool valve including a sleeve and a spool disposed in an internal space of the sleeve. Valve drive mechanism. 5. The switching valve drive mechanism according to claim 1, wherein the actuator is configured as a solenoid that linearly moves the movable core in an axial direction. 6. 6. The switching valve driving mechanism according to claim 1, wherein the valve characteristic adjusting device adjusts a valve timing of the internal combustion engine. The switching valve drive mechanism according to any one of claims 1 to 6, wherein the power supply means is configured to supply power to the coil via a slip ring. The switching valve drive mechanism according to claim 7, wherein the power feeding means includes a support member that is attached to the internal combustion engine body side and extends through the rotation shaft space to the coil, and the support member and the coil A switching valve drive mechanism characterized in that the slip ring is disposed therebetween. The switching valve drive mechanism according to claim 7, wherein the power supply means includes a support member that is attached to the coil side or the inner peripheral surface side of the valve camshaft and penetrates the rotation shaft space. A switching valve drive mechanism, wherein the slip ring is arranged between the main body side of the internal combustion engine. The switching valve drive mechanism according to any one of claims 1 to 9, wherein the valve cam shaft provided with the rotation shaft space is one or both of an intake valve cam shaft and an exhaust valve cam shaft. A switching valve drive mechanism. 11. The switching valve drive mechanism according to claim 1, wherein the internal combustion engine is for driving a vehicle. 12. The switching valve drive mechanism according to claim 11, wherein the internal combustion engine is a horizontal type.

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