WO2019187825A1

WO2019187825A1 - Variable valve mechanism and actuator

Info

Publication number: WO2019187825A1
Application number: PCT/JP2019/006491
Authority: WO
Inventors: 健篠▲崎▼; 中川　光; 小川　徹; 真宏 ▲高▼野; 水野　大輔
Original assignee: 三菱電機株式会社
Priority date: 2018-03-27
Filing date: 2019-02-21
Publication date: 2019-10-03
Also published as: JPWO2019187825A1; JP6840290B2

Abstract

Provided is a variable valve mechanism in which a motor 30 which outputs rotational force to the output shaft end side regulates the timing of opening and closing the intake valve and exhaust valve of an internal combustion engine. The variable valve mechanism is provided with a drive control device 50 provided on the other end side of the motor 30, which is located opposite the output shaft end, and controlling the drive of the motor 30. The drive control device 50 has a lower cover 52 located on the side thereof facing the motor 30. The motor 30 has therein a circulation flow passage 62 through which a refrigerant to which the heat of the motor 30 is transmitted flows. A gap 64 which is in communication with the circulation flow passage 62 and through which a refrigerant flows is provided between the motor 30 and the lower cover 52.

Description

Variable valve mechanism and actuator

The present invention relates to a variable valve mechanism that adjusts valve timing of an internal combustion engine by a motor, and an actuator.

In order to adjust the opening / closing timing (valve timing) of an intake valve and an exhaust valve of an internal combustion engine, a variable valve mechanism having a motor as shown in Patent Document 1 is known.

JP2015-148183A

In recent years, electronic control of a variable valve mechanism has been desired. However, if a drive control device is attached to the variable valve mechanism described in Patent Document 1 for electronic control, heat generated in the variable valve mechanism is generated. The drive control device may be affected by the above.

The present invention has been made to solve such a problem, and an object thereof is to provide a variable valve mechanism and an actuator in which the influence of heat received by the drive control device is reduced.

In order to solve the above problems, a variable valve mechanism according to the present invention is a variable valve mechanism that adjusts the opening and closing timings of an intake valve and an exhaust valve of an internal combustion engine by a motor that outputs a rotational force to an output shaft end side. The drive control device is provided on the other end side of the motor located on the opposite side to the output shaft end side, and controls the drive of the motor, and the drive control device is located on the side facing the motor. The motor has a first cover, and the motor has a first refrigerant flow path through which a refrigerant to which heat of the motor is transmitted flows, and the refrigerant flows between the motor and the first cover through the first refrigerant flow path. A second refrigerant channel is provided.

Further, the actuator according to the present invention includes a speed reducer, an output shaft end side disposed radially inward of the speed reducer, a motor that drives the speed reducer, and a motor that is located on the opposite side of the output shaft end side. Provided on the end side is provided with a drive control device for controlling the drive of the motor, the drive control device has a first cover located on the side facing the motor, and the motor has a refrigerant through which the heat of the motor is transmitted. A first refrigerant flow path is provided, and a second refrigerant flow path is provided between the motor and the first cover so as to communicate with the first refrigerant flow path.

The variable valve mechanism and the actuator according to the present invention have a first refrigerant flow path through which a refrigerant that transmits heat of the motor flows, and communicate with the first refrigerant flow path between the motor and the first cover. Therefore, the influence of the heat received by the drive control device can be reduced.

1 is a schematic view of a system having a variable valve mechanism according to Embodiment 1 of the present invention. It is sectional drawing which shows the variable valve mechanism shown in FIG. It is the enlarged view to which the A section of FIG. 2 was expanded. It is sectional drawing of the variable valve mechanism which concerns on Embodiment 2 of this invention. FIG. 5 is a cross-sectional view of the heat transfer promoting body shown in FIG. 4 cut along a cutting line BB. 6 is a cross-sectional view of a heat transfer promoting body according to a first modification of the second embodiment. FIG. FIG. 10 is a cross-sectional view of a heat transfer promoting body according to a second modification of the second embodiment. FIG. 12 is a cross-sectional view of a heat transfer promoting body according to a third modification of the second embodiment. It is sectional drawing of the variable valve mechanism which concerns on Embodiment 3 of this invention. It is sectional drawing of the drive control apparatus which concerns on Embodiment 4 of this invention. It is sectional drawing of the drive control apparatus which concerns on Embodiment 5 of this invention. It is sectional drawing of the drive control apparatus which concerns on Embodiment 6 of this invention. It is sectional drawing of the drive control apparatus which concerns on Embodiment 7 of this invention. It is the schematic of the system which has a variable valve mechanism based on Embodiment 8 of this invention. It is a front view of the 2nd internal gear concerning Embodiment 9 of this invention. It is sectional drawing of the 2nd internal gear which concerns on Embodiment 9 of this invention. It is a front view of the 2nd internal gear concerning Embodiment 10 of this invention. It is the schematic of the motor vehicle system which has a variable valve mechanism based on Embodiment 11 of this invention.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, the variable valve mechanism 100 rotates the camshaft 40 (refer to FIG. 2) relative to a crankshaft (not shown) of the internal combustion engine 101, thereby It adjusts the opening / closing timing of the exhaust valve, that is, the valve timing. The variable valve mechanism 100 is provided in a driving force transmission system from the crankshaft to the camshaft 40.

The variable valve mechanism 100 is provided with a motor described later, and the motor is cooled by a refrigerant. The refrigerant 104 that has flowed through the motor is discharged to the outside of the variable valve mechanism 100 and is collected in the drain pan 102. The refrigerant 104 collected in the drain pan 102 is pumped up by the pump 103 and supplied to the variable valve mechanism 100 again to circulate. As the refrigerant 104, for example, hydrofluorocarbon (HFC) or automatic transmission fluid (ATF) can be used.

As shown in FIG. 2, the variable valve mechanism 100 is provided with a speed reducer 10. A motor 30 is provided inside the speed reducer 10. A camshaft 40 is provided on the output shaft end side of the motor 30. A drive control device 50 that drives and controls the motor 30 is provided on the other end side opposite to the output shaft end side of the motor 30. The variable valve mechanism 100 is fixed to a cover (not shown) of the internal combustion engine 101. The variable valve mechanism 100 may be fixed to a chain cover (not shown) of the internal combustion engine 101.

The speed reducer 10 has a first external housing 11 and a second external housing 12 that are arranged in the axial direction of the camshaft 40. The first outer housing 11 and the second outer housing 12 are fixed by bolts (not shown), for example. A sprocket 20 is provided outside the second outer housing 12. A chain (not shown) is attached to the sprocket 20, and the power of a crankshaft (not shown) of the internal combustion engine 101 (see FIG. 1) is transmitted to the sprocket 20. Therefore, the second outer housing 12 can rotate in conjunction with a crankshaft (not shown).

A first internal gear 13 is fixed inside the first outer housing 11. A second internal gear 14 is slidably provided inside the second external housing 12 via a lubricating liquid. The lubricating liquid includes oil, and the second outer housing 12 and the second internal gear are lubricated by the oil film of the oil. A pinion 15 is provided inside the first internal gear 13 and the second internal gear 14. The first internal gear 13 and the second internal gear 14 are provided eccentrically with respect to the pinion 15. The pinion 15 has a first external gear 15 a and a second external gear 15 b, and is engaged with the first internal gear 13 and the second internal gear 14.

The first outer housing 11, the second internal gear 14, and the pinion 15 are supported by the inner housing 32 of the motor 30 via a bearing 31. The inner housing 32 is joined to the rotor 33 and can be rotated together with the rotation of the rotor 33. A stator 35 that supports the rotor 33 via a bearing 34 is provided inside the rotor 33. The rotor 33 is configured to be rotatable while maintaining a gap between the rotor 33 and the stator 35.

The second internal gear 14 is connected to the camshaft 40 via the connecting member 41. When a current is applied to the motor 30, the rotor 33 rotates and the inner housing 32 rotates. Next, the rotation of the internal housing 32 is transmitted from the second external gear 15 b to the second internal gear 14. The camshaft 40 is rotated by the rotation of the second internal gear 14. Thereby, the rotational force of the motor 30 is transmitted to the camshaft 40, and the camshaft 40 adjusts the valve timing of an intake valve or an exhaust valve (not shown).

The drive control device 50 includes an upper cover 51, a lower cover 52, and an electronic device 53. The upper cover 51 and the lower cover 52 are housings that house the electronic device 53, and the lower cover 52 is located on the side of the drive control device 50 that faces the motor 30. The upper cover 51 is provided so as to be sandwiched between the electronic device 53 and the lower cover 52, and covers the drive control device 50 on the side where the lower cover 52 is not provided. The lower cover 52 constitutes a first cover, and the upper cover 51 constitutes a second cover. The upper cover 51 and the lower cover 52 protect the electronic device 53 from dust and droplets outside the drive control device 50.

The lower cover 52 is provided with a fastening portion 54 for fastening the drive control device 50 to the motor 30. The fastening portion 54 has a first fastening member 54 a and a second fastening member 54 b, and the first fastening member 54 a and the second fastening member 54 b are fastened to a holding mechanism 55 attached to the stator 35. As a result, the drive control device 50 is fastened to the motor 30.

The electronic device 53 includes a power module, a control board that controls driving of the power module, and other electronic devices. The power module may be a power semiconductor or a switching element. The electronic device 53 is electrically connected to the motor 30, applies a drive current to the motor 30, and controls the rotation speed and phase of the motor 30. That is, the motor 30 is electronically controlled.

The drive control device 50 is disposed close to the motor 30 in order to shorten the wiring length to the motor 30 and prevent the motor 30 from being overheated due to a voltage drop or an increase in current due to a voltage drop. Further, the drive control device 50 is disposed in the vicinity of the motor 30 in order to prevent an increase in the size of the entire variable valve mechanism 100 due to an increase in the wiring length with the motor 30.

Since the drive control device 50 is disposed on the far side from the internal combustion engine in the axial direction of the motor 30, the temperature rise of the drive control device 50 is prevented, and the occurrence of problems due to the temperature rise of the drive control device 50 is prevented. be able to. In addition, since the gap 64 communicating with the outside of the motor 30 is formed between the motor 30 and the drive control device 50, heat transfer from the motor 30 to the drive control device 50 can be prevented.

A circulation channel 62 is formed inside the stator 35 of the motor 30. The circulation channel 62 is a cylindrical space through which a refrigerant can flow. A refrigerant supply path 60 is formed at the outermost radial direction of the camshaft 40, and communicates with the circulation flow path 62 via a refrigerant supply hole 61 provided in the second internal gear 14. The circulation flow path 62 communicates with the gap 64 via the refrigerant circulation hole 63 formed in the fastening portion 54. The gap 64 is opened toward the outside of the variable valve mechanism 100, and a drain pan 102 (see FIG. 1) is provided below. That is, the refrigerant supply path 60, the circulation flow path 62, and the gap 64 constitute a refrigerant flow path through which the refrigerant flows.

Since the circulation flow path 62 is provided in the stator 35, the circulation flow path 62 can be shortened compared with the case where the circulation flow path 62 is arrange | positioned in the position of the outer peripheral side of the reduction gear 10, for example, and a variable valve As a whole of the mechanism 100, it is possible to prevent an increase in size particularly in the radial direction.

Next, the operation of the variable valve mechanism 100 of the first embodiment will be described.
In the following description of the operation, when the second internal gear 14 is viewed from the camshaft 40 side along the rotation axis of the motor 30, the second internal gear 14 is in relation to the second external housing 12. The direction rotating clockwise is the advance side, and the direction rotating counterclockwise is the retard side.

When the internal combustion engine 101 shown in FIG. 1 is operated, a drive current according to an instruction from the drive control device 50 is supplied to the motor 30 as shown in FIG. When the rotation phase of the second internal gear 14 with respect to the second external housing 12 matches the target value, the drive control device 50 rotates the rotor 33 and the second external housing 12 at the same speed. At this time, the pinion 15 rotates at the same speed as the second external housing 12 and the second internal gear 9. Therefore, the valve timing of the intake valve of the internal combustion engine is maintained.

When the rotational phase of the second internal gear 14 with respect to the second outer housing 12 is on the retard side with respect to the target value, the drive control device 50 moves the rotor 33 at a higher speed relative to the second outer housing 12. Rotate with That is, the drive control device 50 rotates the rotor 33 relative to the second external housing 12 in the advance side. At this time, the rotation of the rotor 33 is decelerated by the pinion 15 and transmitted to the second internal gear 14. As a result, the second internal gear 14 rotates relative to the second external housing 12 toward the advance side, and the valve timing of the intake valve of the internal combustion engine is advanced.

When the rotation phase of the second internal gear 14 with respect to the second outer housing 12 is on the more advanced side than the target value, the drive control device 50 moves the rotor 33 at a lower speed relative to the second outer housing 12. Rotate with or reverse. That is, the drive control device 50 rotates the rotor 33 relative to the second outer housing 12 in the retarded angle direction. At this time, the rotation of the rotor 33 is decelerated by the pinion 15 and transmitted to the second internal gear 14. As a result, the second internal gear 14 rotates relative to the second external housing 12 toward the retard side, and the valve timing of the intake valve of the internal combustion engine is retarded.

When the rotor 33 is rotating at the same speed, higher speed, lower speed, or reverse rotation with respect to the second outer housing 12 as described above, the rotation of the rotor 33 causes the stator 35 to move in the circumferential direction. It generates heat almost uniformly. Therefore, in order to cool the stator 35 which is a main heat source of the motor 30, the refrigerant is caused to flow through the circulation passage 62 of the stator 35.

The refrigerant supplied from the refrigerant supply path 60 flows into the circulation path 62 via the refrigerant supply hole 61. The refrigerant flowing into the circulation channel 62 contacts the stator 35, and most of the heat of the stator 35 is transmitted to the refrigerant.

As shown in FIG. 3, the refrigerant to which the heat of the stator 35 has been transmitted flows into the gap 64 via the refrigerant circulation hole 63 as a refrigerant flow 65 indicated by a broken line in FIG. 3. The refrigerant flowing through the gap 64 flows out of the variable valve mechanism 100 from below the variable valve mechanism 100 (see FIG. 1) and is collected by the drain pan 102. As described above, the refrigerant collected in the drain pan 102 is pumped up by the pump 103 and flows into the circulation channel 62 again as shown in FIG.

When the refrigerant flows through the circulation flow path 62, the inside of the stator 35 can be efficiently cooled. Therefore, it is not necessary to provide the drive control device 50 away from the motor 30 that is the heat source of the variable valve mechanism 100 in consideration of the heat problem. Therefore, in designing the variable valve mechanism 100, an increase in the size of the variable valve mechanism 100 can be avoided. Further, since the heat of the stator 35 transmitted to the drive control device 50 side is transmitted to the drive control device 50 side via the holding mechanism 55 and the fastening portion 54, the heat is lost on the path through which the heat is transmitted. Thereby, it is possible to prevent high heat from being transmitted to the electronic device 53 and damaging the electronic device 53.

Further, a gap 64 is provided between the motor 30 and the drive control device 50, and an air layer having a low thermal conductivity is formed between the motor 30 and the drive control device 50. Therefore, heat transfer from the motor 30 to the drive control device 50 can be reduced, and high heat can be prevented from being transmitted to the electronic device 53 and damaging the electronic device 53.

Thus, the variable valve mechanism according to the first embodiment adjusts the opening / closing timings of the intake valve and the exhaust valve of the internal combustion engine 101 by the motor 30 that outputs the rotational force to the output shaft end side. 100, provided on the other end side of the motor 30 located on the opposite side to the output shaft end side, and provided with a drive control device for controlling the drive of the motor. Further, the drive control device 50 has a lower cover 52 located on the side facing the motor 30, and the motor 30 has a circulation flow path 62 through which a refrigerant that transmits heat of the motor 30 flows. In addition, the variable valve mechanism 100 is provided that has a gap 64 through which the refrigerant flows and between the motor 30 and the lower cover 52 and through which the refrigerant flows. be able to.

Further, the second refrigerant flow path is a gap 64, and the refrigerant flows out to the outside through the gap 64, so that the refrigerant can circulate through the variable valve mechanism 100 efficiently.

The motor 30 includes a rotor 33 and a stator 35 on the radially inner side of the rotor 33, and the circulation flow path 62 is provided inside the stator 35. The stator 35 can be efficiently cooled.

In addition, the reduction gear 10 is connected to the camshaft 40 that adjusts the opening and closing timings of the intake valve and the exhaust valve, and the motor 30 that drives the reduction gear 10 is disposed inside the reduction gear 10 in the radial direction. The variable valve mechanism 100 can be reduced in size.

Further, since the circulation flow path 62 communicates with the refrigerant supply path 60 provided in the camshaft 40, the stator 35 can be efficiently cooled.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described. In the following embodiments, the same reference numerals as those in FIGS. 1 to 3 are the same or similar components, and detailed description thereof is omitted.
The variable valve mechanism according to the second embodiment is different from the first embodiment in that a heat transfer promoting body is provided in the circulation channel.

As shown in FIG. 4, the variable valve mechanism 200 according to the second embodiment has a heat transfer promoting body 66 in the circulation channel 62. As shown in FIG. 5A, the stator 35 has a stator winding 36 and a stator core 37. A plurality of heat transfer promoting bodies 66 having a rectangular cross section are provided so as to protrude from the stator core 37 toward the circulation flow path 62 inside the stator 35. The heat transfer promoting body 66 is made of a resin having good thermal conductivity, and the heat of the stator 35 is transmitted. In addition, the material of the heat transfer promotion body 66 may be other than resin, for example, a metal having good heat conductivity. Other configurations are the same as those of the first embodiment.

By having the heat transfer promoting body 66, the contact area with the refrigerant is wider in the circulation flow path 62 of the second embodiment than the circulation flow path 62 of the first embodiment. Thereby, the heat of the stator 35 can be efficiently transmitted to the refrigerant.

Thus, since the heat transfer promoting body 66 that transmits the heat of the stator 35 to the refrigerant is provided inside the stator 35, the heat of the rotor 33 can be efficiently transmitted to the refrigerant flowing through the rotor 33.

In Embodiment 2, the stator 35 has the heat transfer promoting body 66 in the circulation flow path, but may have a heat transfer promoting body in a form other than this. As a first modified example, as shown in FIG. 5B, a transmission having a cylindrical portion fitted to the inner periphery of the stator 35 and a plurality of protruding portions protruding from the cylindrical portion to the circulation flow path 62. The heat promoting body 66a may be installed inside the stator 35 by any means such as press fitting, brazing, and adhesion.

Further, as a second modification of the second embodiment, as shown in FIG. 5C, a plurality of heat transfer promoting bodies 66b having wedge-shaped cross sections protruding from the stator core 37 toward the circulation flow path 62 are provided. May be.

Further, as a third modification of the second embodiment, as shown in FIG. 5D, a heat transfer promotion body 66 c that is fitted to the inner periphery of the stator 35 and has an inner periphery that is uneven in the circumferential direction is used as the stator 35. It may be installed by any means of press fitting, brazing, and bonding.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described.
The variable valve mechanism according to the third embodiment is different from the first embodiment in that a diversion promoting body is provided in the circulation channel.

As shown in FIG. 6, a diversion promoting body 67 is provided in the circulation flow path 62 inside the stator 35. The diversion promoting body is an orifice-shaped member having a hole in the center formed of resin, and is formed so as to restrict the diameter of the circulation flow path 62 to the inner side in the radial direction. The flow resistance of the circulation flow path 62 is increased by providing the branch flow promoting body 67 in the circulation flow path 62. Due to this increase in flow resistance, a part of the refrigerant flow that passes through the circulation flow path 62 shown as the first refrigerant flow 65a passes through the gap of the bearing 31 shown as the second refrigerant flow 65b, and the rotor 33 and the stator. The flow is divided into a flow passing through the gap of the flow bearing 34. In order to exhibit the cooling performance required when the stator 35 is cooled, the diversion promoting body 67 divides the flow rates of the first refrigerant flow 65a and the second refrigerant flow 65b at an appropriate ratio determined in advance. It is formed so as to be shunted to the ratio. Other configurations are the same as those of the first embodiment.

As described above, since the stator 35 has the diversion promoting body 67 for diverting a part of the refrigerant flowing through the circulation flow path 62 so as to flow between the rotor 33 and the stator 35, the motor 30 is provided. The size can be reduced, and the variable valve mechanism 300 can be reduced accordingly.

In addition, the diversion promoting body 67 of the third embodiment is not limited to an orifice-shaped member made of resin, and a structure such as a porous body can also be used.

Further, in addition to the diversion promoting body 67 of the third embodiment, the heat transfer promoting body 66 of the second embodiment may be provided in the circulation channel 62.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described.
The variable valve mechanism according to the fourth embodiment is different from the first embodiment in that the material of the lower cover of the drive control device is changed.

FIG. 7 shows a cross-sectional view of the drive control device 50a. In the fourth embodiment, the lower cover 52a of the drive control device 50a may be formed entirely of a synthetic resin material having a low thermal conductivity, for example, polyphenylene sulfide (PPS) resin. . That is, the lower cover 52a constitutes a heat insulating member. Other configurations are the same as those of the first embodiment.

Since the lower cover 52a is formed of a material having low thermal conductivity, when the high-temperature refrigerant that has received the heat of the stator 35 (see FIG. 2) flows through the gap 64, the lower cover 52a that is in contact with the high-temperature refrigerant. It is possible to prevent heat from being transmitted to the electronic device 53 of the drive control device 50a via the, and to prevent the electronic device 53 from failing.

As described above, the lower cover 52a includes the heat insulating member 52a that prevents heat from being transferred from the refrigerant to the drive control device 50a. Since the lower cover 52a that prevents heat from being transferred from the refrigerant to the drive control device 50a is provided, it is possible to prevent the electronic control device 53 from malfunctioning and the drive control device 50a from malfunctioning.

Embodiment 5 FIG.
Next, a fifth embodiment of the present invention will be described.
The variable valve mechanism according to the fifth embodiment is different from the first embodiment in that a heat insulator is provided on the lower cover of the drive control device.

FIG. 8 shows a cross-sectional view of the drive control device 50b. In the fifth embodiment, the lower cover 52b of the drive control device 50b has a heat insulator 56 formed of a synthetic resin material having a low thermal conductivity, for example. The heat insulator 56 may be made of, for example, PPS resin. Further, the heat insulator 56 is provided at a position corresponding to the axial extension of the motor 30 in the lower cover 53b. Further, the heat insulator 56 constitutes a heat insulating member. Other configurations are the same as those of the first embodiment.

Since the lower cover 52b has the heat insulator 56 as a separate body, when the high-temperature refrigerant receiving the heat of the stator 35 (see FIG. 2) flows through the gap 64, the high-temperature refrigerant contacts the lower cover 52b. Thus, heat can be prevented from being transmitted to the electronic device 53 of the drive control device 50b, and the electronic device 53 can be prevented from being damaged.

Further, a place where the heat insulator 56 is not provided in the lower cover 52b may be formed of a material having a high thermal conductivity such as an aluminum alloy material. Thereby, the heat of the electronic device 53 can be released from the aluminum alloy material portion and the temperature of the electronic device 53 can be lowered while preventing the electronic device 53 from being damaged by the heat of the refrigerant transmitted to the electronic device 53. .

Thus, since the lower cover 52b has the heat insulator 56 separate from the lower cover 52b, which prevents heat from being transferred from the refrigerant to the drive control device 50b, the electronic device 53 fails and the drive control device 50b It is possible to prevent malfunction.

Embodiment 6 FIG.
Next, a sixth embodiment of the present invention will be described.
The variable valve mechanism according to the sixth embodiment is different from the first embodiment in that the drive control device is provided with a sealing body.

FIG. 9 shows a cross-sectional view of the drive control device 50c. At the position where the first fastening member 54 a and the second fastening member 54 b fasten the lower cover 52, the wiring that electrically connects the electronic device 53 and the motor 30 (see FIG. 2) is passed through the lower cover 52. An opening is formed. This opening is sealed with a sealing body 57 formed of a material that does not allow the refrigerant to pass therethrough. Other configurations are the same as those of the first embodiment.

In the sixth embodiment, since the sealing body 57 seals the opening formed at the position where the first fastening member 54a and the second fastening member 54b fasten the lower cover 52, the stator 35 When the high-temperature refrigerant that has received the heat (see FIG. 2) flows through the gap 64, it is possible to prevent the high-temperature refrigerant from entering the drive control device 50c and causing the electronic device 53 to fail.

Thus, since the lower cover 52 has the sealing body 57 that prevents the refrigerant from entering the inside of the drive control device 50c, the electronic device 53 is prevented from malfunctioning and the drive control device 50c from malfunctioning. can do.

Embodiment 7 FIG.
Next, a seventh embodiment of the present invention will be described.
The variable valve mechanism according to the seventh embodiment is different from the first embodiment in that an electronic device is provided with a heat radiation promoting material.

FIG. 10 shows a cross-sectional view of the drive control device 50d. The drive control device 50d has a substrate 71 on which a switching element 70 constituting the electronic device 53a is mounted. Further, a heat radiation promoting material 72 is attached to and contacts the surface opposite to the surface mounted on the substrate 71 of the switching element 70. Further, the heat radiation promoting material 72 is attached to the inner wall of the upper cover 51. Further, the heat radiation promoting material 72 is made of a sheet-like resin having good thermal conductivity. Other configurations are the same as those of the first embodiment.

In the seventh embodiment, the switching element 70 is attached to the upper cover 51 via the heat radiation promoting material 72. Therefore, the heat generated by the operation of the switching element 70 is transmitted to the upper cover 51 through the heat radiation promoting material 72. Thereby, the heat generated in the switching element 70 can be radiated from the upper cover 51. Accordingly, the high-temperature refrigerant that has received the heat of the stator 35 (see FIG. 2) flows through the gap 64, the refrigerant contacts the lower cover 52, and the lower cover 52 becomes hot due to the heat of the refrigerant. Can be prevented by radiating heat from the upper cover 51.

As described above, the drive control device 50d includes the electronic device 53a that drives the motor 30, the upper cover 51 that is positioned so as to sandwich the electronic device 53a between the lower cover 52, the electronic device 53a, and the upper cover 51. Since the heat radiation promoting material 72 that contacts the inner wall and transfers heat from the electronic device 53a to the upper cover 51 is provided, it is possible to prevent the switching element 70 from failing and prevent the drive control device 50d from malfunctioning. it can.

In the seventh embodiment, a sheet-like resin having good thermal conductivity is used as the heat radiation promoting material 72. However, a heat radiation promoting material formed of an arbitrary shape and material may be used, for example, using a heat sink. May be. Moreover, although the electronic device 53a mounted on the substrate 71 includes the switching element 70, the electronic device 53a is not limited to this. For example, when the electronic device 53 a mounted on the substrate 71 includes, for example, a filter reactor and a capacitor in addition to the switching element 70, a heat radiation promoting material 72 may be provided between these components and the upper cover 51.

Embodiment 8 FIG.
Next, an eighth embodiment of the present invention will be described.
The variable valve mechanism according to the eighth embodiment shares a refrigerant for cooling the variable valve mechanism and a refrigerant for cooling the internal combustion engine with respect to the first embodiment.

As shown in FIG. 11, the refrigerant 104 is supplied from the internal combustion engine 101 to the variable valve mechanism 100. The refrigerant 104 is a refrigerant that has flowed through the internal combustion engine 101 for use in cooling the internal combustion engine 101. The refrigerant supplied to the variable valve mechanism 100 flows into the circulation flow path 62 from the refrigerant supply path 60 via the refrigerant supply hole 61 (see FIG. 2). Thereafter, the refrigerant to which the heat of the stator 35 is transferred flows into the gap 64 through the refrigerant circulation hole 63. The refrigerant that has flowed through the gap 64 flows out below the drive control device 50 and is collected in the drain pan 102. The refrigerant collected in the drain pan 102 is pumped up by the pump 103, supplied again to the internal combustion engine 101, and reused.

The refrigerant supplied to the internal combustion engine 101 is cooled by exchanging heat with cooling water (not shown) in the internal combustion engine. The cooled refrigerant flows through the internal combustion engine 101 and is used for cooling the internal combustion engine 101. As a result, a system having the variable valve mechanism 100 and the internal combustion engine 101 can be configured efficiently without providing a device for separately supplying a dedicated refrigerant for cooling the variable valve mechanism 100.

Thus, the refrigerant flow path including the circulation flow path 62 and the gap 64 is connected to the internal combustion engine 101, and the refrigerant cools the internal combustion engine 101. Therefore, the variable valve mechanism 100 and the internal combustion engine 101 supply the refrigerant separately. Therefore, the apparatus configuration is simplified and the efficiency of the apparatus is improved.

In the eighth embodiment, the cooling method of the refrigerant in the internal combustion engine 101 is a method of exchanging heat with cooling water, but other methods may be used, for example, a method of cooling by a heat exchanger (not shown). There may be.

In the first to eighth embodiments, the refrigerant is used to cool the variable valve mechanism 100. However, instead of the refrigerant, the first internal gear 13, the second internal gear, and the pinion shown in FIG. 15 and the lubricating oil used for lubricating the

bearings

31 and 34 may be used. As a result, the variable valve mechanism 100 can be cooled without separately circulating a refrigerant.

Embodiment 9 FIG.
Next, a ninth embodiment of the present invention will be described.
The variable valve mechanism according to the ninth embodiment is different from the first embodiment in that the refrigerant supply hole provided in the second internal gear is configured as a multistage hole or a conical shape.

FIG. 12 shows a front view of the second internal gear 14. FIG. 13 shows a cross-sectional view of the second internal gear 14. The second internal gear 14 is supplied from the refrigerant supply path 60 provided at the outermost radial direction of the camshaft 40 (see FIG. 2) to the circulation flow path 62 provided inside the stator 35 of the motor 30. Has a refrigerant supply hole 61b. Other configurations are the same as those of the first embodiment.

In the ninth embodiment, the shape of the refrigerant supply hole 61b is approximately the same as the diameter of the refrigerant supply path 60 on the refrigerant supply path 60 side, whereas the diameter on the circulation flow path 62 side is the refrigerant supply. It is larger than the diameter on the path 60 side. Therefore, the pressure loss when the refrigerant flows through the refrigerant supply hole 61b can be reduced. Accordingly, the amount of refrigerant flowing through the refrigerant supply path 60 and the circulation flow path 62 can be increased without changing the capacity of the pump 103 that supplies the refrigerant. Therefore, the stator 35 can be efficiently cooled.

In the ninth embodiment, the shape of the refrigerant supply hole 61b is a multistage hole, but it may be a conical shape such as a trumpet.

Thus, it has the internal housing 32 provided in the motor 30, and the 2nd internal gear 14 supported by the internal housing 32, and the 2nd internal gear 14 is the refrigerant | coolant supply hole 61b in which a refrigerant | coolant is supplied. And the refrigerant supply hole 61b is formed in a multistage hole or a conical shape, so that the amount of refrigerant flowing through the refrigerant supply path 60 and the circulation flow path 62 can be increased without changing the capacity of the pump 103 that supplies the refrigerant. Can do.

Embodiment 10 FIG.
Next, an embodiment 10 of the invention will be described.
The variable valve mechanism according to the tenth embodiment is different from the first embodiment in that the second internal gear is provided with a refrigerant supply groove.

FIG. 14 shows a front view of the second internal gear 14. The second internal gear 14 has a refrigerant supply groove 80 for supplying a refrigerant between the second internal gear 14 and the second external housing 12. Other configurations are the same as those of the first embodiment.

In the tenth embodiment, the second internal gear 14 is provided with a refrigerant supply groove 80 for supplying a refrigerant between the second internal gear 14 and the second external housing 12. A refrigerant is supplied to a gap formed between the toothed gear 14 and the second outer housing 12 to promote formation of an oil film. The oil film functions as a lubricating liquid between the second internal gear 14 and the second outer housing 12. Therefore, it is possible to prevent the second internal gear 14 and the second outer housing 12 from being worn by stably supplying the refrigerant through the refrigerant supply groove 80.

As described above, the second external housing 12 having the second internal gear 14 slidably provided therein is provided, and the second internal gear 14 is disposed between the second internal gear 14 and the second external housing 12. Since the coolant supply groove 80 for supplying the coolant to the coolant is stably supplied, it is possible to prevent the second internal gear 14 and the second external housing 12 from being worn by stably supplying the coolant.

In the tenth embodiment, the refrigerant supply groove 80 is formed at a position of 180 degrees with respect to the refrigerant supply hole 61. However, the present invention is not limited to this position. It may be formed.

Embodiment 11 FIG.
Next, an eleventh embodiment of the present invention will be described.
The variable valve mechanism according to the eleventh embodiment is provided in an automobile vehicle relative to the first embodiment.

As shown in FIG. 15, a variable valve mechanism 200 is installed in an internal combustion engine 202 provided in an automobile vehicle 201. Other configurations are the same as those in the eighth embodiment.

By installing the variable valve mechanism 200 in the internal combustion engine 202 provided in the automobile vehicle 201, the variable valve mechanism 200 can be efficiently operated in accordance with the driving situation of the automobile vehicle 201. Therefore, the fuel efficiency of the internal combustion engine 202 is improved, and an efficient automobile vehicle 201 can be configured.

In this way, the motor 30 installed in the automobile vehicle 201 having the internal combustion engine 202 and outputting the rotational force to the output shaft end side adjusts the opening and closing timings of the intake valve and the exhaust valve of the internal combustion engine 202. In addition, since the variable valve mechanism 200 operates, the internal combustion engine 202 operates efficiently, thereby improving fuel efficiency and providing an efficient automobile vehicle for an automobile vehicle not provided with the variable valve mechanism 200. can do.

In another embodiment of the present invention, instead of a variable valve mechanism, a motor, a speed reducer, and a drive control device that controls driving of the motor are provided, and the motor speed is reduced as an actuator that decelerates by the speed reducer. May be.

As described above, the output shaft end side is disposed on the radially inner side of the speed reducer, and is provided on the other end side of the motor, which is located on the opposite side of the speed reducer, the motor that drives the speed reducer, and the output shaft end side. A drive control device for controlling the drive of the motor, the drive control device having a lower cover positioned on the side facing the motor, and the motor having a circulation flow path through which a refrigerant for transferring the heat of the motor flows. In addition, since there is a gap through which the refrigerant flows between the motor and the lower cover and through which the refrigerant flows, it is possible to provide an actuator in which the influence of heat received by the drive control device is reduced.

The present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from the spirit of the invention.

10 reducer, 14 second internal gear, 30 motor, 32 internal housing, 33 rotor, 35 stator, 40 camshaft, 50 drive control device, 51 upper cover (cover), 52 lower cover (cover), 52a Lower cover (cover, heat insulating member), 53, 53a electronic device, 56 heat insulating body (heat insulating member), 57 sealed body, 60 refrigerant supply path (third refrigerant flow path), 61b refrigerant supply hole, 62 circulation flow path ( (First refrigerant flow path), 64 gap (second refrigerant flow path), 66, 66a, 66b, 66c heat transfer promotion body, 67 shunting promotion body, 72 heat release promotion material, 80 refrigerant supply groove, 201 automobile vehicle.

Claims

A variable valve mechanism that adjusts the opening and closing timing of an intake valve and an exhaust valve of an internal combustion engine by a motor that outputs a rotational force to the output shaft end side,
Provided on the other end side of the motor, located on the opposite side to the output shaft end side, and provided with a drive control device for controlling the drive of the motor,
The drive control device has a first cover located on a side facing the motor,
The motor has a first refrigerant flow path through which a refrigerant through which the heat of the motor is transmitted flows,
A variable valve mechanism that has a second refrigerant channel that communicates with the first refrigerant channel and through which the refrigerant flows, between the motor and the first cover.
The variable valve mechanism according to claim 1, wherein the second refrigerant flow path is a gap, and the refrigerant flows out through the gap.
The motor has a rotor and a stator on a radially inner side of the rotor,
The variable valve mechanism according to claim 1 or 2, wherein the first refrigerant flow path is provided inside the stator.
The variable valve mechanism according to claim 3, further comprising a heat transfer promoting body that transfers heat of the stator to the refrigerant inside the stator.
5. The shunt promoting body according to claim 3, further comprising a shunt promoting body that shunts a part of the refrigerant flowing through the first refrigerant flow path so as to flow between the rotor and the stator. Variable valve mechanism.
The variable valve mechanism according to any one of claims 1 to 5, wherein the first cover includes a heat insulating member that prevents heat from being transferred from the refrigerant to the drive control device.
The variable motion according to any one of claims 1 to 5, wherein the first cover includes a heat insulating member separate from the first cover, which prevents heat from being transferred from the refrigerant to the drive control device. Valve mechanism.
The variable valve mechanism according to any one of claims 1 to 7, wherein the first cover includes a sealing body that prevents the refrigerant from entering the drive control device.
The drive control device includes:
An electronic device for driving the motor;
A second cover positioned so as to sandwich the electronic device with the first cover;
The variable valve operating system according to any one of claims 1 to 8, further comprising a heat radiation promoting material that contacts the electronic device and an inner wall of the second cover and transfers heat from the electronic device to the second cover. mechanism.
The variable valve mechanism according to any one of claims 1 to 9, wherein the first refrigerant channel and the second refrigerant channel are connected to the internal combustion engine, and the refrigerant cools the internal combustion engine.
An internal housing provided in the motor;
A second internal gear supported by the inner housing;
The variable valve according to any one of claims 1 to 10, wherein the second internal gear has a refrigerant supply hole through which the refrigerant is supplied, and the refrigerant supply hole is configured in a multistage hole or a conical shape. mechanism.
A second external housing provided with the second internal gear slidably on the inside;
The variable valve mechanism according to claim 11, wherein the second internal gear has a refrigerant supply groove for supplying the refrigerant between the second internal gear and the second external housing.
The opening / closing timing of the intake valve and the exhaust valve of the internal combustion engine is adjusted by the motor that is installed in the automobile vehicle having the internal combustion engine and outputs rotational force to the output shaft end side. The variable valve mechanism according to claim 1.
A reduction gear connected to a camshaft for adjusting the opening and closing timing of the intake valve and the exhaust valve;
The variable valve mechanism according to claim 1, wherein the motor that drives the speed reducer is disposed radially inside the speed reducer.
The variable valve mechanism according to claim 14, wherein the first refrigerant flow path communicates with a third refrigerant flow path provided in the camshaft.
A reducer,
An output shaft end side is arranged on the radially inner side of the speed reducer, and a motor that drives the speed reducer;
Provided on the other end side of the motor, located on the opposite side to the output shaft end side, and provided with a drive control device for controlling the drive of the motor,
The drive control device has a first cover located on a side facing the motor,
The motor has a first refrigerant flow path through which a refrigerant through which the heat of the motor is transmitted flows,
An actuator having a second refrigerant flow path that communicates with the first refrigerant flow path and through which the refrigerant flows, between the motor and the first cover.