JP2007278275A - Valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the environmental temperature of a driver and a TPS in a valve device disposed in an air intake and exhaust system, stabilize the characteristics of each constituting component, and increase the valid range of temperatures of the valve device. <P>SOLUTION: A throttle device 1 includes a throttle valve 2 disposed in an intake passage of an engine, a throttle body 3 in which the throttle valve 2 is stored, and a cover module 5 having a motor 4 attached thereto. The cover module 5 is equipped with a motor storage part 21, a driver storage part 22, and a TPS storage part 23. The cover module 5 is formed of a synthetic resin having low heat conductivity. A dividing wall A is provided between the motor storage part 21 and the TPS storage part 23, a dividing wall B is provided between the motor storage part 21 and the driver storage part 22, and a dividing wall C is provided between the driver storage part 22 and the TPS storage part 23. Each of the storage parts 21 to 23 is thermally separated by the dividing walls A to C, and interrelated influence of heat generation among each part is suppressed to the minimum. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a valve device disposed in an intake / exhaust system of an engine, and more particularly to an improvement in temperature environment of a motor driver and a rotation angle sensor mounted on an electronically controlled throttle device or the like.

  2. Description of the Related Art In recent years, with the digitization of automobile parts, electronically controlled valve devices that drive a valve body with an electric motor are widely used in engine intake and exhaust systems. For example, so-called electronically controlled throttle devices that drive a valve element with a motor are also increasing in engine throttle valves. In this case, the throttle valve is controlled by an electric signal instead of the mechanical operation by the conventional accelerator wire. The accelerator depression amount is electrically detected by a potentiometer or the like, and the motor is driven according to the value to open and close the throttle valve.

  FIG. 8 is an explanatory view showing the configuration of a conventional electronically controlled throttle device. 8 includes a throttle body 103 having a throttle valve 102 and a cover module 105 having a motor 104 and the like. The throttle body 103 is formed by aluminum die casting, and a cover module 105 using a metal cover 106 is attached to the upper end portion in the drawing. The throttle body 103 is provided with a bore 107 that forms part of the intake passage of the engine, and the throttle valve 102 is accommodated in the bore 107. The cover module 105 includes a motor 104, a driving circuit 108 such as a motor driving driver and controller, and a throttle opening sensor using a non-contact type angle sensor (Throttle Position Sensor, hereinafter abbreviated as TPS as appropriate). 109 etc. are arranged.

  The throttle valve 102 is fixed to a throttle shaft 111 that is rotatably supported by the throttle body 103. A throttle gear 112 and a sensor hub 113 of TPS 109 are attached to the upper end portion of the throttle shaft 111. An idle shaft 114 is further attached to the throttle body 103, and an idle gear 115 is rotatably supported on the idle shaft 114. The idle gear 115 has a small-diameter gear 115a and a large-diameter gear 115b, and the small-diameter gear 115a meshes with the throttle gear 112. The large-diameter gear 115b meshes with a motor gear 117 fixed to the rotating shaft 116 of the motor 104. A reduction mechanism 118 is formed by the motor gear 117, the idle gear 115, and the throttle gear 112, and the rotation output of the motor 104 is transmitted to the throttle shaft 111 via the reduction mechanism 118. A torsion coil spring (not shown) is attached to the throttle shaft 111, and the throttle valve 102 is opened by the rotational force of the motor 104, and is returned to the fully closed position by the torsion coil spring.

In the cover module 105, a circuit board 119 to which the drive circuit 108 and the like are attached is disposed. On this circuit board 119, a magnetic detection element 121 for detecting the rotational angle position of the motor 104, a drive circuit 108, and a magnetic detection element 122 of the TPS 109 are mounted. The magnetic detection element 121 outputs a rotor position signal in accordance with the magnetic pole change of the rotor 123 of the motor 104 and sends it to the drive circuit 108. The magnetic detection element 122 outputs a throttle opening signal in accordance with a change in the magnetic pole of the sensor magnet 124 attached to the sensor hub 113. The sensor hub 113 rotates together with the throttle shaft 111, and the throttle opening signal indicates the opening of the throttle valve 102. This throttle opening signal is also sent to the drive circuit 108. The drive circuit 108 controls the operation of the motor 104 based on the throttle opening signal and the rotor position signal described above. When the motor 104 is operated, the throttle shaft 111 rotates through the idle gear 115, and the throttle valve 102 is opened and closed. The opening degree of the throttle valve 102 is detected by the TPS 109, and the motor 104 is feedback-controlled based on the rotor position signal in consideration of the accelerator operation amount, the traveling speed, the valve opening degree, and the like.
JP 2001-132495 A JP 2004-162679 A JP 2005-163555 A

  On the other hand, in such a throttle device 101, each component (the motor 104, the drive circuit 108, and the TPS 109) arranged in the cover module 105 has a different heat-resistant category, and the drive circuit 108 and the TPS 109 have the motor Lower heat resistance than 104. That is, the heat resistance temperature of the motor 104 is about 180 to 200 ° C. from the heat resistance of the windings and magnets, whereas the heat resistance temperature of the drive circuit 108 is about 120 to 150 ° C. from the heat resistance of the signal system electronic components. The heat resistance temperature of the TPS 109 is about 120 to 150 ° C. due to the heat resistance of the magnetic detection element 122. However, when the motor 104 is a brushless motor as shown in FIG. 8, the heat-resistant temperature of the magnetic detection element 121 disposed inside the motor is about 120 to 150 ° C.

  On the other hand, the motor 104 generates the largest amount of heat during operation. Next, the drive circuit 108 (motor energization switching semiconductor switching element portion) is large, and the self-heating of the TPS 109 is extremely small as compared with the motor 104 and the drive circuit 108. Therefore, if such components having different heat resistance and heat generation are arranged in the same cover 106 as shown in FIG. 8, there arises a problem that the drive circuit 108 and the TPS 109 are easily affected by the heat generated by the motor 104. In particular, the TPS 109 is easily affected by heat generated not only by the motor 104 but also by the drive circuit 108. For this reason, in the cover module 105, the cover 106 is made of a metal such as aluminum, and is used as a heat dissipation means for the motor 104 and the drive circuit 108 to reduce heat influence on other components as well as heat dissipation of the motor 104 and the like. ing.

  However, since the throttle device 101 itself is disposed in the vicinity of the engine of an automobile and is exposed to a high temperature environment, the heat dissipation effect of the metal cover is not sufficiently exhibited. For this reason, there is a problem that it is difficult to keep the temperature environment of each component, particularly the electronic components of the drive circuit 108 and the TPS 109 below the heat-resistant temperature, and the temperature compatibility may not be satisfied. Further, regarding the non-contact type TPS 109, if a heat source such as the motor 104 or the drive circuit 108 is arranged nearby, the heat of the motor 104 or the drive circuit 108 in the cover module 105 exceeds the heat around the engine. Strongly affected by fever. For this reason, the magnetic flux density of the sensor magnet 124 changes according to the ambient temperature, and there is a problem that the performance as the TPS 109 is lowered. Furthermore, when the sensor magnet 124 is made of a material that demagnetizes on the high temperature side, such as neodymium, the sensor magnet 124 is demagnetized due to the high temperature, and the sensor characteristics deteriorate.

  Similar problems exist not only when the throttle device but also various valve devices arranged in the intake / exhaust system of the engine are electronically controlled. FIG. 9 is an explanatory view showing various valve devices arranged in the intake / exhaust system of the engine. As shown in FIG. 9, the intake / exhaust system of the engine 131 includes, in addition to the throttle valve 102 described above, an EGR (Exhaust Gas Recirculation) valve 132, an EGR bypass valve 133, an intercooler bypass valve 134, A swirl control valve 135, an exhaust throttle valve 136, and the like are provided. Among these, an intercooler bypass valve 134 and a throttle valve 102 are disposed in the intake passage 137, and an EGR valve 132 and an EGR bypass valve 133 are disposed in the exhaust recirculation passage 138. An exhaust throttle valve 136 is disposed in the exhaust passage 139.

  In recent years, an increasing number of vehicles are equipped with an EGR valve 132 that is installed to re-intake a part of exhaust gas after combustion in order to comply with exhaust gas regulations and reduce fuel consumption at partial load. Generally, in an internal combustion engine, the exhaust gas after combustion does not contain oxygen or is in a lean state. Therefore, when exhaust gas is mixed with intake air, the oxygen concentration decreases. When this is supplied to the engine, combustion occurs in a state where the oxygen concentration is lower than the atmosphere. For this reason, the combustion temperature of the engine decreases, and the generation of nitrogen oxides (NOx) is suppressed accordingly. Further, at the time of partial load, if EGR is performed, the required throttle opening increases in order to supply the same amount of oxygen in the cylinder as in non-EGR (to obtain the same output). As a result, the pumping loss during intake is reduced and the fuel consumption rate is improved. That is, by reducing the amount of oxygen sucked per one stroke of the piston, it is possible to obtain the same effect as if the vehicle is operated by depressing the accelerator with a small displacement engine, and fuel consumption can be reduced.

  Also in such an EGR valve 132, when the valve is opened and closed by an electric motor and the valve operation is electronically controlled, the problem of the thermal influence as described above occurs as in the throttle device. Also, in other valves, the same heat influence problem is considered in electronic control, and countermeasures have been demanded.

  An object of the present invention is to suppress the environmental temperature of a driver and a TPS in a valve device arranged in an intake / exhaust system, stabilize the characteristics of each component, and expand the temperature establishment range of the valve device.

  The valve device of the present invention is a valve device disposed in an intake / exhaust system of an engine, and a cover to which a main body portion in which a valve body is accommodated and a motor that is mounted on the main body portion and drives the valve body is attached. And the cover module includes a motor housing portion in which the motor is disposed, and a sensor housing portion in which an opening degree detection device for detecting the opening degree of the valve body is disposed, and the motor housing portion. And a first partition wall formed of a synthetic resin between the sensor housing portion and the sensor housing portion.

  In the present invention, the first partition made of synthetic resin is disposed between the motor housing portion and the sensor housing portion, so that the motor housing portion and the sensor housing portion have a low thermal conductivity. Isolated by resin. As a result, the heat generated by the motor is not easily transmitted to the sensor housing, the influence of the heat generation of the motor on the opening detection device is suppressed, the characteristics of the opening detection device are stabilized, and the temperature establishment range of the valve device is expanded. To do.

  In the valve device, the cover module further includes a driver accommodating portion in which the drive circuit of the motor is disposed, and a second partition formed of a synthetic resin between the driver accommodating portion and the motor accommodating portion Alternatively, a third partition made of synthetic resin may be provided between the driver housing portion and the sensor housing portion. By such second and third partition walls, the driver housing portion and the motor housing portion, and the driver housing portion and the sensor housing portion are also separated by a synthetic resin having low thermal conductivity. For this reason, the heat generated by the motor is hardly transmitted to the drive circuit and the sensor housing portion, and the heat generated by the drive circuit is also not easily transmitted to the sensor housing portion. Therefore, the influence of the heat generation of the motor on the drive circuit and the opening detection device and the influence of the heat generation of the drive circuit on the opening detection device are suppressed, the characteristics of the drive circuit and the opening detection device are stabilized, and the temperature of the valve device is established. The range is also expanded.

  Further, a fourth partition that separates the power system element and the signal system element of the motor drive circuit may be provided in the driver housing portion. As a result, the power system element and the signal system element are separated by a synthetic resin having low thermal conductivity, so that the heat generated in the power system element is not easily transmitted to the signal system element, and the ambient temperature of the signal system element is suppressed. Therefore, the device characteristics are stabilized and the temperature reliability is improved.

  Furthermore, a metal cover may be attached to the driver accommodating portion, and the drive circuit may be accommodated in the cover. Thereby, the heat generated in the drive circuit is efficiently radiated through the metal cover. Further, a metal heat sink attached to the drive circuit may be disposed inside the driver housing portion. For example, when the heat generation of the power system element is small, the drive circuit and the heat radiating plate may be both housed in the driver housing portion, and the heat generated by the power system element may be efficiently radiated by the heat radiating plate. In addition, a metal case may be attached to the motor accommodating portion, and the motor may be accommodated in the case. Thereby, the heat generated by the motor is efficiently radiated through the metal case.

  On the other hand, in the valve device, as the motor, a stator provided with an armature winding, a rotor provided with a permanent magnet and rotatably disposed inside the stator, and a rotor position detection for detecting a rotational position of the rotor A brushless motor provided with a portion, the stator may be disposed in the motor housing portion, and the rotor position detecting portion may be disposed outside the first partition with respect to the motor housing portion. As a result, the rotor position detection unit is isolated from the armature winding, which is a heat generating part, and the first partition. For this reason, the ambient temperature of the rotor position detection unit is suppressed, the characteristics of the elements used therein are stabilized, and the temperature reliability is improved.

  In the valve device, the valve body may be a throttle valve of the engine. That is, the valve device may be an engine throttle device. In the valve device, the valve body may be an EGR valve of the engine. That is, the valve device may be an engine EGR device.

  According to the valve device of the present invention, the valve device disposed in the intake / exhaust system of the engine includes a main body portion in which the valve body is accommodated, and a cover module in which a motor that is mounted on the main body portion and drives the valve body is attached. The cover module includes a motor housing portion in which the motor is disposed, and a sensor housing portion in which an opening degree detection device for detecting the opening degree of the valve body is disposed, and the motor housing portion and the sensor housing portion, Since the first partition made of synthetic resin is disposed between the motor housing portion and the sensor housing portion, the motor housing portion and the sensor housing portion are separated by a synthetic resin having low thermal conductivity, and the heat generated by the motor is It is possible to suppress the transmission to. For this reason, the influence of the heat generation of the motor on the opening detection device can be suppressed, the characteristics of the opening detection device can be stabilized, and the temperature range in which the valve device can be used can be expanded.

  Further, according to the valve device of the present invention, the cover module is further provided with a driver accommodating portion in which the motor drive circuit is disposed, and is formed of a synthetic resin between the driver accommodating portion and the motor accommodating portion. Two partition walls are provided between the driver housing portion and the sensor housing portion, and a third partition wall made of synthetic resin is provided between the driver housing portion and the sensor housing portion. Is separated by a synthetic resin with low thermal conductivity, and heat generated in the motor can be prevented from being transmitted to the drive circuit and the sensor housing portion, and heat generated in the drive circuit can be transmitted to the sensor housing portion. It becomes possible to suppress. For this reason, the influence of the heat generation of the motor on the drive circuit and the opening detection device and the influence of the heat generation of the drive circuit on the opening detection device can be suppressed, and the characteristics of the drive circuit and the opening detection device can be stabilized. The environmental temperature range in which the valve device can be used is also expanded.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view showing the configuration of an electronically controlled throttle device that is Embodiment 1 of the present invention. The throttle device 1 in FIG. 1 is a kind of valve device disposed in the intake / exhaust system of the engine, and is disposed in the intake passage of the engine as shown in FIG. 9 described above. The throttle device 1 is provided with a throttle valve (valve element) 2, and the intake air amount of the engine is controlled by the opening degree. As with the throttle device 101 of FIG. 8, the throttle device 1 of FIG. 1 includes a throttle body (main body portion) 3 having a throttle valve 2 and a cover module 5 having a motor 4 and the like. The throttle body 3 is formed of aluminum die cast or synthetic resin, and a cover module 5 is attached to the upper end portion in FIG. A main body 5a of the cover module 5 is formed of a synthetic resin, and a drive circuit 6, a TPS (opening detection device) 7 and the like are arranged in the main body 5a together with the motor 4.

  The throttle valve 2 is fixed to a throttle shaft 8 that is rotatably supported by the throttle body 3. The throttle body 3 is provided with a bore portion 9 that forms a part of the intake passage of the engine, and the throttle valve 2 is accommodated in the bore portion 9. A throttle gear 11 and a sensor hub 12 of TPS 7 are attached to the upper end portion of the throttle shaft 8. Further, a torsion coil spring (not shown) is attached to the throttle shaft 8. The torsion coil spring urges the throttle shaft 8 in a predetermined rotational direction, and the urging force automatically causes the throttle valve 2 to reach the fully closed position. Will return.

  An idle shaft 13 is attached to the throttle body 3. An idle gear 14 is rotatably supported on the idle shaft 13. The idle gear 14 is provided with a small-diameter gear 14a and a large-diameter gear 14b above and below. The small diameter gear 14 a meshes with the throttle gear 11, and the large diameter gear 14 b meshes with the motor gear 16 fixed to the rotating shaft 15 of the motor 4. A reduction mechanism 17 is formed by the motor gear 16, the idle gear 14 and the throttle gear 11. The rotational output of the motor 4 is transmitted to the throttle shaft 8 via the speed reduction mechanism 17.

  The cover module 5 includes a motor housing portion 21 in which the motor 4 is disposed, a driver housing portion 22 in which a driving circuit 6 such as a driver and a controller for driving the motor is disposed, and a TPS housing portion in which the TPS 7 is disposed ( Sensor accommodating portion) 23 is provided. The cover module 5 is formed of a synthetic resin having low thermal conductivity, and the housing portions 21 to 23 are separated into separate chambers by partition walls A to C, respectively. FIG. 2 is an explanatory view showing the relationship between the accommodating portions 21 to 23 and the partition walls A to C. As illustrated in FIG. 2, a partition A (first partition) is provided between the motor housing 21 and the TPS housing 23, and a partition B (second partition) is provided between the motor housing 21 and the driver housing 22. A partition wall C (third partition wall) is provided between the driver housing portion 22 and the TPS housing portion 23.

  A motor 4 using a brushless motor is disposed in the motor housing portion 21. The motor 4 has a so-called inner rotor type configuration in which a rotor 32 is rotatably disposed inside a stator 31. The stator 31 includes a drive coil (armature winding) 33 and a stator core 34 around which the coil 33 is wound. The stator core 34 is formed by laminating metal plates. A plurality of salient poles are provided on the inner peripheral side of the stator core 34, and a drive coil 33 is wound around the salient poles to form a motor winding. Electric power is supplied to the drive coil 33 via the conductive plate 35. The stator core 34 is fixed to a metal case 36. The case 36 is fixed to the cover module main body 5a with screws 37. The case 36 is exposed to the outside air, and the heat generated by the motor 4 is radiated from the case 36 to the outside of the apparatus.

  The rotor 32 includes a rotor core 38 fixed to the rotating shaft 15 and a rotor magnet (permanent magnet) 39 fixed to the outer periphery of the rotor core 38. Similarly to the stator core 34, the rotor core 38 is also formed by laminating metal plates. The rotor magnet 39 is formed in a cylindrical shape and is provided with N and S2 poles. The rotating shaft 15 is rotatably supported by bearings 41a and 41b. The bearing 41a is attached to the case 36, and the bearing 41b is attached to a bracket 42 inserted into the cover module body 5a. A motor gear 16 is fixed to the tip of the rotating shaft 15.

  A rotor position detector 40 is provided below the rotor magnet 39 in FIG. The rotor position detection unit 40 is provided with a Hall IC (magnetic detection element) 43 that detects a magnetic pole change of the rotor 32. The Hall IC 43 is placed on the substrate 44 fixed to the cover module main body 5a. From the Hall IC 43, a pulsed rotor position signal is output to the rotor 32 due to a change in magnetic pole accompanying rotation. A conductive plate 45a inserted into the cover module main body 5a is connected to the substrate 44, and the rotor position signal is sent to the drive circuit 6 via the conductive plates 45a and 44b.

  A drive circuit 6 for driving and controlling the motor 4 is disposed in the driver accommodating portion 22. The drive circuit 6 is provided with a power system element 46a and a signal system element 46b. A heat radiating cover 47 made of a metal having high thermal conductivity such as aluminum is attached to the upper opening of the driver accommodating portion 22. The heat radiation cover 47 is closely fixed to the cover module body 5a, and heat radiation fins 48 are provided on the outer side. The power system element 46a of the drive circuit 6 is fixed to the inside of the heat radiating cover 47, and the heat generated there is quickly radiated from the heat radiating cover 47 to the outside of the apparatus. A substrate 49 is also arranged in the driver accommodating portion 22, and a signal system element 46 b and the like are placed on the substrate 49. The drive circuit 6 is connected to the connector 51 via conductive plates 45 c and 45 d connected to the substrate 49.

  A non-contact type angle sensor (TPS) 7 that detects the throttle opening is disposed in the TPS accommodating portion 23. The TPS 7 includes a sensor hub 12, a sensor magnet 52 attached to the sensor hub 12, and a Hall IC (magnetic detection element) 53 disposed so as to face the sensor magnet 52. The sensor hub 12 is made of synthetic resin and is fixed to the end of the throttle shaft 8. A ring magnet is used for the sensor magnet 52, and a plurality of magnetic poles are formed along the circumferential direction. A substrate 54 is also disposed in the TPS accommodating portion 23, and the Hall IC 53 is placed on the substrate 54. The substrate 54 is connected to the connector 51 by a conductive plate 45e. When the throttle shaft 8 rotates, the sensor hub 12 rotates accordingly. As a result, the magnetic pole of the sensor magnet 52 facing the Hall IC 53 changes. Along with this magnetic pole change, the Hall IC 53 outputs a pulse-like throttle opening signal.

  In the throttle device 1, when the motor 4 is operated as the engine starts, the throttle shaft 8 rotates via the speed reduction mechanism 17, and the throttle valve 2 opens and closes. At this time, the drive circuit 6 controls the opening degree of the throttle valve 2 in consideration of the accelerator operation amount, the traveling speed, the valve opening degree, and the like. That is, the drive circuit 6 controls the operation of the motor 4 based on the rotor position signal from the Hall IC 43 and feedback-controls the rotation angle of the motor 4 based on the throttle opening signal from the Hall IC 53. On the other hand, when the engine is started and the motor 4 is operated in this way, as described above, the motor 4 and the drive circuit 6 (particularly, the power system element 46a) generate heat, and the heat is transmitted to the TPS 7 and the like, and the sensor performance decreases. There is a risk of problems such as

  On the other hand, in the throttle device 1, the heat radiation promotion structure is adopted for the motor 4 and the driver housing portion 22, the cover module body 5 a is formed of a synthetic resin having low thermal conductivity, and the housing portions 21 to 23 are formed. The partition walls A to C are provided between them, and a heat shield structure is employed in which the influence of heat generated by the motor 4 and the drive circuit 6 does not reach the TPS 7. That is, first, with respect to the motor 4 that generates the largest amount of heat, a metal case 36 is attached so as to be exposed to the outside air, and the heat of the motor 4 is radiated to the outside through the case 36. Moreover, the partition A is provided in the bottom part and side part of the motor accommodating part 21, and it becomes difficult for the heat | fever of the motor 4 to be transmitted to another site | part. Thereby, the heat generated in the motor 4 is not easily transmitted to the drive circuit 6 and the TPS 7.

  Next, with respect to the drive circuit 6 (power element 46a) that generates heat next to the motor 4, a heat dissipation cover 47 having good heat dissipation is installed so that the heat is not transmitted to other parts, and the generated heat is radiated to the outside. To do. As a result, heat release of the power element 46a into the driver accommodating portion 22 is suppressed, and thermoelectric transmission to the signal element 46b that generates little heat is minimized. Further, partition walls A and B are provided on the side and bottom of the driver accommodating portion 22 so that the heat inside the driver accommodating portion 22 is not easily transmitted to other parts. Thereby, the heat generated in the drive circuit 6 is not easily transmitted to the TPS 7. Further, the heat radiation from the motor 4 is blocked by the partition wall B, so that the exhaust heat of the motor 4 is hardly affected in the driver accommodating portion 22.

  As described above, in the throttle device 1, heat is radiated from the motor 4 and the drive circuit 6 by the case 36 and the heat radiating cover 47, and the heat of the motor 4 is transferred into the driver housing 22 and the TPS 7 by the partition walls A, B, and C. It is hard to be transmitted to. Therefore, it is possible to minimize the mutual influence of the heat generation at each part, which is one of the problems when the motor 4, the drive circuit 6, and the TPS 7 are integrated. In particular, the ambient temperature of the signal system element 46b in the driver accommodating portion 22 and the Hall IC 53 of the TPS 7 can be suppressed, and the element characteristics can be stabilized. As a result, these electronic components and the like can be used without any trouble even in a high temperature environment, and the environmental temperature range in which the throttle device 1 can be used is expanded. In particular, regarding the non-contact type TPS 7 in which temperature stability is particularly required, temperature rise (fluctuation) can be minimized, and sensor characteristics can be stabilized.

  Next, a throttle device that is Embodiment 2 of the present invention will be described. FIG. 3 is a cross-sectional view illustrating a configuration of the cover module 61 in the throttle device according to the second embodiment. In the following embodiments, the same members and portions as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In the cover module 61 of FIG. 3, the rotor position detector 40 of the motor 4 is disposed outside the partition wall A. Here, a sensor rotor 62 is fixed on the rotary shaft 15, and a sensor magnet 63 magnetized to the same pole as the magnetic pole of the rotor magnet 39 is attached to the outer periphery of the sensor rotor 62. The cover module main body 61a is provided with a board attachment portion 64, and the board 44 is attached thereto. A Hall IC 43 is placed on the substrate 44 so as to face the sensor magnet 63.

  In such a cover module 61, the coil 33 which is a heat generating part of the motor 4 and the rotor position detecting part 40 are separated by a synthetic resin partition wall A. Therefore, the motor heat generating part and the Hall IC 43 are thermally separated. As described above, the Hall IC 43, like other electronic components, has a relatively low heat-resistant temperature and is easily affected by heat generation. On the other hand, in the throttle device, since the rotor position detection unit 40 is separated from the heat generation part and the partition wall A, the Hall IC 43 is not easily affected by the heat generated by the motor 4. For this reason, the atmospheric temperature of the Hall IC 43 is suppressed, the element characteristics are stabilized, and the temperature reliability is improved. By arranging the Hall IC 43 outside the partition wall A, the partition between the Hall IC 43 and the TPS 7 does not exist. However, the TPS 7 originally has little self-heating, and the performance of the Hall IC 43 is improved even if there is no partition between the two. It will not be damaged.

  FIG. 4 is a cross-sectional view showing the configuration of the cover module 65 in the throttle device that is Embodiment 3 of the present invention. In the cover module 65 of FIG. 4, a partition D (fourth partition) is further provided inside the driver accommodating portion 22. As described above, heat is generated by the power element 46 a and is radiated by the heat radiating cover 47. However, since the power element 46a generates a large amount of heat, the signal element 46b may be affected by the radiant heat of the power element 46a if both elements 46a and 46b are opposed to each other in the driver housing portion 22. There is. Therefore, in the throttle device according to the third embodiment, the partition D is provided in the driver accommodating portion 22, and the driver is connected to the controller 67 that includes the power system element 46a that generates a large amount of heat and the signal system element 46b such as an IC. The inside of the accommodating part 22 is isolate | separated. Thereby, the power unit 66 and the controller unit 67 are thermally separated, and the heat generated by the power system element 46a is not easily transmitted to the signal system element 46b. Therefore, the ambient temperature of the signal system element 46b is suppressed, the element characteristics are stabilized, and the temperature reliability is improved. In addition, the environmental temperature range in which the throttle device 1 can be used is expanded.

  FIG. 5 is a cross-sectional view showing a configuration of a cover module 71 in the throttle device that is Embodiment 4 of the present invention. The cover module 71 shown in FIG. 5 uses the motor 72 with a brush in place of the brushless motor in the configuration of the first embodiment. In the throttle device of the fourth embodiment, a DC brush motor is used as a drive source for the throttle valve 2 and a bottomed cylindrical metal case 73 is used. A field magnet 74 is attached to the inner peripheral surface of the case 73, and an armature 75 is rotatably disposed inside the magnet 74. A rotary shaft 15 is attached to the armature 75, and the rotary shaft 15 is rotatably supported by bearings 76a and 76b.

  The armature 75 has an armature core 78 in which a plurality of slots 77 are formed. The armature core 78 is fixed to the rotary shaft 15, and an armature coil 79 is wound between the slots 77. A commutator 81 is disposed below the armature core 78 in the figure. The commutator 81 is also fixed to the rotating shaft 15, and a plurality of commutator pieces 82 are fixed to the outer periphery thereof. Each commutator piece 82 is connected to an armature coil 79, and a brush 83 is in sliding contact with the outer periphery thereof. The brush 83 is accommodated in a brush holder 84 fixed to the cover module body 5a. As described above, the present invention can be applied not only to a device using the brushless motor 4 as in the first to third embodiments but also to a device using the brush motor 72 as shown in FIG. .

  FIG. 6 is a cross-sectional view showing the configuration of the cover module 85 in the throttle device that is Embodiment 5 of the present invention. In the cover module 85 of FIG. 6, a heat radiating metal plate (heat radiating plate) 86 of the power element 46 a is disposed in the driver accommodating portion 22. Here, a cover 87 made of synthetic resin is attached on the cover module main body 85a, and the driver accommodating portion 22 is formed therein. When the loss (heat generation) of the power element 46a is small, the drive circuit 6 and the heat radiating plate 86 may be housed in the cover 87 as described above. In this case, the thickness of the cover 87 may be reduced except for the motor 72 side having a partition function, so that the heat dissipation in the driver accommodating portion 22 may be enhanced. Other configurations are the same as those of the fourth embodiment shown in FIG. In this embodiment, a brushless motor may be used instead of the motor 72.

  FIG. 7 is a cross-sectional view showing the configuration of the cover module 91 in the throttle device that is Embodiment 6 of the present invention. In the cover module 91 of FIG. 7, the drive circuit 6 is not arranged in the cover module, and only the motor 72 and the TPS 7 are provided. Thus, even when the drive circuit 6 is not disposed in the cover module 91, the effect of heat separation can be expected between the motor 72 and the TPS 7. In this case, a brushless motor may be used instead of the motor 72.

It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.
For example, the material of each member in the above-described embodiment is merely an example, and the present invention is not limited to the above-described material. Also, the configuration of the embodiment can be combined as appropriate. For example, the configuration of the embodiment 3 (FIG. 4) is applied to the throttle device of the embodiment 2 (FIG. 3) and the throttle device of the embodiment 4 (FIG. 5). Alternatively, the power section 66 and the controller section 67 may be separated by providing a partition wall D in the driver housing section 22. Further, the configuration of the fifth embodiment (FIG. 6) can be applied to the throttle device of the second embodiment (FIG. 3) and the throttle device of the fourth embodiment (FIG. 5).

  Further, in the above-described embodiment, the present invention is applied to the throttle device. However, other valve devices disposed in the intake / exhaust system of the engine, for example, EGR bypass valve, intercooler bypass valve, swirl control valve, etc. It is also applicable to various valve devices such as exhaust brake valves and exhaust throttle valves.

It is sectional drawing which shows the structure of the electronically controlled throttle apparatus which is Example 1 of this invention. It is explanatory drawing which shows the relationship between each accommodating part and a partition. It is sectional drawing which shows the structure of the cover module in the throttle apparatus which is Example 2 of this invention. It is sectional drawing which shows the structure of the cover module in the throttle apparatus which is Example 3 of this invention. It is sectional drawing which shows the structure of the cover module in the throttle apparatus which is Example 4 of this invention. It is sectional drawing which shows the structure of the cover module in the throttle apparatus which is Example 5 of this invention. It is sectional drawing which shows the structure of the cover module in the throttle apparatus which is Example 6 of this invention. It is explanatory drawing which shows the structure of the conventional electronically controlled throttle apparatus. It is explanatory drawing which shows the various valve apparatuses arrange | positioned at the intake / exhaust system of an engine.

Explanation of symbols

1 Throttle device 2 Throttle valve (valve)
3 Throttle body (main part)
4 Motor 5 Cover Module 5a Cover Module Body 6 Drive Circuit 7 Throttle Opening Sensor (TPS; Opening Detection Device)
8 Throttle shaft 9 Bore portion 11 Throttle gear 12 Sensor hub 13 Idle shaft 14 Idle gear 14a Small diameter gear 14b Large diameter gear 15 Rotating shaft 16 Motor gear 17 Reduction mechanism 21 Motor accommodating portion 22 Driver accommodating portion 23 TPS accommodating portion (sensor accommodating portion)
31 Stator 32 Rotor 33 Coil (armature winding)
33 Drive coil 34 Stator core 35 Conductive plate 36 Case 37 Screw 38 Rotor core 39 Rotor magnet (permanent magnet)
40 Rotor position detector 41a, 41b Bearing 42 Bracket 43 Hall IC
44 Boards 45a to 45e Conductive plate 46a Power system element 46b Signal system element 47 Radiation cover 48 Radiation fin 49 Board 51 Connector 52 Sensor magnet 53 Hall IC
54 Substrate 61 Cover module 61a Cover module body 62 Sensor rotor 63 Sensor magnet 64 Substrate mounting portion 65 Cover module 66 Power unit 67 Controller unit 71 Cover module 72 Motor 73 Case 74 Magnet 75 Armature 76a, 76b Bearing 77 Slot 78 Armature core 79 Armature Coil 81 Commutator 82 Commutator piece 83 Brush 84 Brush holder 85 Cover module 85a Cover module body 86 Heat sink 87 Cover 91 Cover module A Partition (first partition)
B partition (second partition)
C partition (third partition)
D Bulkhead (4th bulkhead)
101 Throttle device
102 Throttle valve
103 Throttle body
104 motor
105 Cover module
106 Cover
107 Bore
108 Drive circuit
109 TPS
111 Throttle shaft
112 Throttle gear
113 Sensor hub
114 idle shaft
115 idle gear
115a small diameter gear
115b large diameter gear
116 Rotation axis
117 Motor gear
118 Deceleration mechanism
119 circuit board
121 Magnetic detection element
122 Magnetic detector
123 rotor
124 Sensor magnet
131 engine
132 EGR valve
133 EGR bypass valve
134 Intercooler bypass valve
135 Swirl control valve
136 Exhaust throttle valve
137 Air intake passage
138 Exhaust gas recirculation passage
139 Exhaust passage

Claims (9)

A valve device disposed in an intake / exhaust system of an engine,
A main body for accommodating the valve body;
A cover module mounted on the main body and attached with a motor for driving the valve body;
The cover module includes a motor housing portion in which the motor is disposed, and a sensor housing portion in which an opening degree detection device for detecting the opening degree of the valve body is disposed, and the motor housing portion and the sensor housing portion. And a first partition wall made of a synthetic resin.   2. The valve device according to claim 1, wherein the cover module further includes a driver housing portion in which a drive circuit of the motor is disposed, and is formed of a synthetic resin between the driver housing portion and the motor housing portion. The valve device according to claim 1, further comprising a third partition wall formed of a synthetic resin between the driver housing portion and the sensor housing portion.   3. The valve device according to claim 2, wherein the driver housing portion includes a fourth partition that separates a power system element and a signal system element of the motor drive circuit.   4. The valve device according to claim 2, wherein a metal cover is attached to the driver accommodating portion, and the drive circuit is accommodated in the cover.   4. The valve device according to claim 2, wherein a metal heat dissipating plate attached to the drive circuit is disposed inside the driver housing portion.   The valve device according to any one of claims 1 to 5, wherein a metal case is mounted on the motor housing portion, and the motor is housed in the case.   The valve device according to any one of claims 1 to 6, wherein the motor includes a stator including an armature winding, a rotor including a permanent magnet and rotatably disposed inside the stator, A brushless motor including a rotor position detection unit that detects a rotational position of the rotor, wherein the stator is disposed in the motor housing unit, and the rotor position detection unit is located outside the first partition with respect to the motor housing unit. The valve device characterized by being arranged in the above.   The valve device according to any one of claims 1 to 7, wherein the valve body is a throttle valve of the engine.   The valve device according to any one of claims 1 to 7, wherein the valve body is an EGR valve of the engine.

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