Throttle control device

Abstract

The throttle valve control device of the present application is capable of preventing the throttle body from being upsized and efficiently cooling the bearings of the throttle shaft. To this end, in the throttle valve control device in which flow paths (5T1-5T3) for a heat exchange medium to flow are formed in a throttle body (5), the diameter of a first bearing (8) of a throttle shaft (3) is larger than the diameter of a second bearing (9), the flow paths (5T1-5T3) are arranged along the outer periphery of an intake passage (1) in a manner of overlapping the second bearing (9) when viewed from the flow direction of the intake passage (1), and an inlet portion (5T1) and an outlet portion (5T3) of the flow paths (5T1-5T3) are arranged in a manner of being separated by the first bearing (8).

Description

Technical Field

[0001] This invention relates to a throttle valve control device for regulating the flow rate of fluid within an internal combustion engine. Specifically, the throttle valve control device is installed in the intake passage of the internal combustion engine and allows for variable control of the cross-sectional area of ​​the intake passage, thereby regulating the amount of air drawn into the cylinder in a gasoline engine and controlling the pressure in the intake manifold in a diesel engine. Furthermore, in gasoline engine vehicles, it can be used in both so-called direct-injection engines (where fuel is directly injected into the cylinder) and so-called port-injection engines (where fuel is injected into the intake manifold). Background Technology

[0002] In particular, in engines with turbochargers, the intake air is pressurized by the turbocharger, which raises the intake air temperature. Therefore, an intercooler is installed downstream of the turbocharger to cool the heated intake air.

[0003] In this case, since the intercooler is located downstream of the throttle body, the high-temperature incoming gas before cooling passes through the throttle body, resulting in insufficient heat resistance of the throttle body bearings. For example, the technology of setting up a cooling water flow path and protecting the components as described in Patent Document 1 is known.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: International Publication No. 2017 / 179392 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] However, in the structure described in Patent Document 1, the cooling water flow path is arranged so that it overlaps with the bearing of the throttle body when viewed from the airflow direction, thus creating the problem that the throttle body becomes larger in the airflow direction.

[0009] The present invention was made in view of the above-mentioned problems, and its object is to provide a throttle valve control device that can prevent the throttle body from becoming too large and efficiently cool the bearings of the throttle shaft.

[0010] Technical solutions for solving the problem

[0011] To achieve the above objectives, the present invention provides a throttle valve control device, comprising: a throttle body having an intake passage for intake air flow; a throttle valve for adjusting the amount of air passing through the intake passage; a throttle valve shaft fixed to the throttle valve; and a first bearing and a second bearing rotatably supporting the throttle valve shaft. A flow path for heat exchange medium flow is formed in the throttle body, the diameter of the first bearing being larger than the diameter of the second bearing, the flow path being arranged along the outer periphery of the intake passage in a manner that overlaps with the second bearing when viewed from the flow direction of the intake passage, and the inlet and outlet portions of the flow path being arranged with the first bearing as a barrier.

[0012] According to the present invention configured as described above, the flow path through which the heat exchange medium flows is arranged along the outer periphery of the intake passage in a manner that overlaps with the second bearing when viewed from the flow direction of the intake passage. Therefore, uniform cooling of the outer periphery of the intake passage is possible, and efficient cooling of the second bearing is also possible. Furthermore, the inlet and outlet portions of the flow path are arranged with the first bearing in between, thus enabling efficient cooling of the first bearing. Additionally, because the flow path is arranged without overlapping with the larger-diameter first bearing, an increase in the dimension of the intake passage of the throttle body in the flow direction is prevented.

[0013] Invention Effects

[0014] The throttle valve control device according to the present invention can prevent the throttle body from becoming too large and can efficiently cool the bearings of the throttle shaft. Attached Figure Description

[0015] Figure 1 This is an exploded perspective view of an electric motor-driven throttle valve control device used in gasoline engine vehicles.

[0016] Figure 2 This is a cross-sectional view of an electric motor-driven throttle valve control device used in gasoline engine vehicles.

[0017] Figure 3 This is a plan view of the electric motor-driven throttle valve control device used in gasoline engine vehicles after the panel has been removed.

[0018] Figure 4 Is it by Figure 2 A cross-sectional view of the cooling water passage enclosed by the dashed circle.

[0019] Figure 5 This is a partially exploded 3D view of the cooling water pipe joint.

[0020] Figure 6 This is a plan view of the electric motor-driven throttle valve control device used in gasoline engine vehicles after the gear cover has been removed.

[0021] Figure 7 This is a perspective view of the electric motor-driven throttle valve control device used in gasoline engine vehicles.

[0022] Figure 8 This is a cross-sectional view of an electric motor-driven throttle valve control device used in gasoline engine vehicles.

[0023] Figure 9 This is a plan view of an electric motor-driven throttle valve control device used in gasoline engine vehicles.

[0024] Figure 10 This is an exploded perspective view of an electric motor-driven throttle valve control device used in gasoline engine vehicles. Detailed Implementation

[0025] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, in this specification and the accompanying drawings, constituent elements having substantially the same function or structure are labeled with the same reference numerals, and redundant descriptions are omitted where appropriate.

[0026] Example 1

[0027] For the throttle valve control device of the first embodiment of the present invention, refer to... Figures 1 to 8 The following description is provided. In this embodiment, the present invention is applied to an electric motor-driven throttle valve control device used in a gasoline engine vehicle.

[0028] like Figure 1 As shown, a cavity 1 is formed in the throttle body 5. Cavity 1 is the intake passage through which the intake air flows. Figure 3 As shown, in the throttle body 5, grooves 5T1 to 5T3 are arranged to surround the outer periphery of the cavity 1. These grooves 5T1 to 5T3 and the plate portion 30 (see reference) constitute the throttle body 5. Figure 1 and Figure 2 This forms a cooling water passage (flow path). Here, the cooling water passage is connected to the inlet-side cooling water pipe 29A and the outlet-side cooling water pipe 29B, which are fixed by being pressed into the throttle body 5. The inlet-side cooling water pipe 29A and the outlet-side cooling water pipe 29B are interfaces with the hoses on the connected side.

[0029] Figure 4 Is it by Figure 2 The diagram shows a cross-sectional view of the cooling water passage enclosed by the dashed circle A. At the ends of the slots 5T1 to 5T3 of the throttle body 5, there are plate mounting portions 5F1 and 5F2, which are wider than the slot width. The plate mounting portions 5F1 and 5F2 serve as bases for mounting the plate portion 30. After the plate portion 30 is mounted on these bases, it is joined to the throttle body 5, for example, by friction stir welding (FSW), ensuring the airtightness of the cooling water passage.

[0030] like Figure 3 and Figure 5 As shown, a wall portion 5W is disposed between the inlet-side cooling water pipe 29A and the outlet-side cooling water pipe 29B. The wall portion 5W prevents cooling water from flowing directly from the inlet-side cooling water pipe 29A to the outlet-side cooling water pipe 29B without passing near the shaft hole.

[0031] like Figure 2 and Figure 3 As shown, an inlet portion 5T1 and an outlet portion 5T3 of a cooling water passage are arranged near the bearing 8, sandwiching the bearing 8. This arrangement allows for cooling of the heat-generating component, the motor 20, at a lower cooling water temperature. Furthermore, because the cooling water passage does not overlap with the bearing 8, it prevents the throttle body from becoming too large.

[0032] Additionally, a mounting hole 5H1 (throttle body fixing part) is provided between the inlet 5T1 of the cooling water passage and the motor 20, through which the bolt for mounting the throttle body 5 to the intake manifold passes. There are four mounting holes, 5H1 to 5H4, but the number of mounting holes can also be three. In this case, to ensure the vibration resistance of the throttle body, mounting holes need to be provided between the inlet 5T1 of the cooling water passage and the motor 20.

[0033] In this way, by arranging the inlet 5T1 and outlet 5T3 of the cooling water passage in such a way that they sandwich a bearing 8 with a larger diameter, it is possible to avoid the size of the throttle valve control device becoming too large, thus forming a compact throttle valve control device with excellent heat resistance.

[0034] like Figure 8 As shown, an intake passage (hereinafter referred to as cavity) 1 and a motor housing 20A for housing the motor 20 are formed together in the cast aluminum throttle valve assembly (hereinafter referred to as throttle body) 5.

[0035] A metal rotating shaft (hereinafter referred to as the throttle shaft) 3 is arranged along a diameter line of the cavity 1 in the throttle body 5. The throttle shaft 3 is rotatably supported at both ends by ball bearings and needle roller bearings, serving as bearings 8 and 9. Bearings 8 and 9 are respectively pressed into and fixed to bearing bosses 6 and 7 provided in the throttle body 5.

[0036] Furthermore, after the bearing 8 is pressed into the throttle body 5, it is pressed into the throttle shaft 3. Then, by pressing it into and fixing it within the throttle body 5, the axial movement of the throttle shaft 3 is restricted. At this point, the bearing 8 can be fixed using riveting. Thus, the throttle shaft 3 is rotatably supported relative to the throttle body 5.

[0037] In the throttle shaft 3, a throttle valve (hereinafter referred to as the throttle valve) 2, which is made of a circular plate of metal material, is inserted into the gap provided in the throttle shaft 3 and fixed to the throttle shaft 3 by means of a threaded part 4. In this way, when the throttle shaft 3 rotates, the throttle valve 2 rotates, resulting in a change in the cross-sectional area of ​​the intake passage, and the intake air flow of the engine is controlled.

[0038] like Figure 6 and Figure 8 As shown, the motor housing 20A is formed approximately parallel to the throttle body shaft 3. A motor 20, consisting of a brushed DC motor, is inserted into the motor housing 20A and fixed by screwing the flange of the motor 20's bracket 20B onto the side wall of the throttle body 5 using a threaded fitting 21. Additionally, as... Figure 8 As shown, a wave washer 25 is provided at the end of the motor 20 to hold the motor 20 in place.

[0039] like Figure 8 As shown, the openings of bearing bosses 6 and 7 are respectively sealed by bearings 8 and 9, forming a shaft seal to maintain airtightness. Furthermore, the cover 10 on the bearing boss 7 side prevents the end of the throttle shaft 3 and bearing 9 from being exposed. This prevents air leakage from bearings 8 and 9, or leakage of bearing lubricating grease into the outside air or the sensor chamber described later.

[0040] A metal gear 22 with the fewest teeth is fixed to the end of the rotating shaft of the electric motor 20. A reduction gear mechanism and a spring mechanism for rotating the throttle shaft 3 are also arranged on the side of the throttle body on the side where the gear 22 is located. These mechanisms are covered by a resin material cover (hereinafter referred to as a gear cover) 26 fixed to the side of the throttle body 5.

[0041] like Figure 8 As shown, a throttle gear 11 is fixed to the end of the throttle shaft 3 on the gear cover 26 side. The throttle gear 11 includes a metal plate 12 and a gear portion 13 made of resin material, which is formed by resin molding of the metal plate 12. The metal plate 12 has a cup-shaped recess in the center and a flange portion for gear forming at the open end of the recess. The gear portion 13 made of resin material is molded into the flange portion by resin molding.

[0042] The metal plate 12 has a hole in the center. Threaded grooves are engraved around the front end of the throttle shaft 3. The metal plate 12 is fixed to the throttle shaft 3 by inserting the front end of the throttle shaft 3 into the hole of the metal plate 12 and screwing the nut 17 into the threaded portion. In this way, the metal plate 12 and the resin gear portion 13 formed therein rotate integrally with the throttle shaft 3.

[0043] A default spring 15, formed of a coil spring, is clamped between the back of the throttle gear 11 and the default lever 16. Additionally, a return spring 14, also formed of a coil spring, is clamped between the back of the default lever 16 and the side of the throttle body 5. These two springs pull on each other in the opening and closing directions, thereby forming a default mechanism that defines the throttle valve opening as a predetermined opening (hereinafter referred to as the default opening) when the motor is energized to the off position.

[0044] This embodiment relates to a throttle valve control device for a gasoline engine vehicle. Therefore, in the initial position of the throttle valve 2, i.e., when the power supply to the electric motor 20 is cut off, the opening position assigned to the throttle valve 2 as the initial position is the default opening. Thus, when the throttle valve 2 is open compared to the default opening, the return spring 14 applies a load in the closing direction towards the default opening, and when the throttle valve 2 is closed compared to the default opening, the default spring 15 applies a load in the opening direction towards the default opening.

[0045] Between the gear 22 mounted on the rotating shaft of the electric motor 20 and the throttle gear 11 fixed to the throttle shaft 3, an intermediate gear 23 is meshed, which is rotatably supported by a gear shaft 24 made of metal material pressed and fixed into the side of the throttle body 5. The intermediate gear 23 consists of a large-diameter gear 23A that meshes with the gear 22 and a small-diameter gear 23B that meshes with the throttle gear 11. The two gears are integrally molded by resin molding. These gears 22, 23A, 23B, and 11 constitute a two-stage reduction gear mechanism. In this way, the rotation of the electric motor 20 is transmitted to the throttle shaft 3 via this reduction gear mechanism.

[0046] These reduction and spring mechanisms are covered by a gear cover 26 made of resin material. A groove for inserting a sealing member 31 is formed on the periphery of the open end of the gear cover 26. With the sealing member 31 installed in this groove, when the gear cover 26 is placed over the throttle body 5, the sealing member 31 is in close contact with the end face of the frame surrounding the gear housing chamber formed on the side of the throttle body 5, thus shielding the gear housing chamber from external gas. Figure 7 As shown, in this state, the gear cover 26 is fixed to the throttle body 5 using 6 clamps 27.

[0047] The following is a detailed description of the rotation angle detection device (throttle sensor) formed between the reduction gear mechanism thus configured and the gear cover 26 covering it.

[0048] like Figure 8 As shown, a resin retainer 19 is integrally formed and fixed to the end of the throttle valve shaft 3 on the gear cover side. A conductor 18 formed by stamping is integrally formed and mounted on the flat portion at the front end of the resin retainer 19. Thus, when the motor 20 rotates and the throttle valve 2 rotates, the conductor 18 also rotates integrally.

[0049] In the gear cover 26, the TPS circuit board 28 is fixed in a position facing the conductor 18. The ASIC configured on the TPS circuit board detects the angle of the conductor 18, thereby detecting the opening degree of the throttle valve 2, and supplies it to the ECU as a sensor output.

[0050] The 5P1 to 5P3 walls arranged in the throttle body 5 are used for positioning the gear cover 26. The positioning protrusions of the gear cover 26 are engaged with these three walls to position the TPS circuit board 28 and the conductor 18 on the rotating side, enabling the output of signals within the required allowable range. The fully open stop part 11A mechanically determines the fully open position of the throttle gear 11 and is composed of a protrusion integrally formed on the side wall of the throttle body.

[0051] The cut end of the throttle gear 11 abuts against the protrusion, so that the throttle shaft 3 will not rotate beyond the fully open position.

[0052] The fully closed stop 11B restricts the fully closed position of the throttle shaft 3. The end of the throttle gear 11 on the opposite side collides with the fully closed stop 11B in the fully closed position, preventing the throttle shaft 3 from rotating to a position above the fully closed position.

[0053] By applying the cooling water passage of the present invention to the throttle valve control device thus formed, a compact throttle valve control device with excellent heat resistance can be obtained. The grooves 5T1 and 5T3 forming the cooling water passage are close to the bearing 8, and have the function of cooling the bearing 8 by transferring heat from the throttle body 5. Similarly, the groove 5T2 is close to the bearing 9, and has the function of cooling the bearing 9 by transferring heat from the throttle body 5. Furthermore, by having the grooves 5T1 to 5T3 annularly surround the cavity 1, the thermal deformation of the cavity 1 is made uniform, thereby reducing the risk of the throttle valve 2 being rigidly attached to the cavity 1.

[0054] According to the embodiment described above, grooves 5T1 to 5T3 integrally formed in the throttle body 5 are disposed adjacent to the peripheral walls of the bearing bosses 6 and 7 of the throttle body 5, which are components of the bearings 8 and 9 that support the throttle body shaft 3. Cooling water passages are formed by these grooves 5T1 to 5T3 and the plate portion 30. This allows the engine cooling water to dissipate heat (or heat to be transferred to the bearings) transmitted from the bearings via the bearing bosses 6 and 7 to the outside of the throttle body.

[0055] Specifically, an outer wall 52 is integrally formed on at least a portion of the outer side of the inner wall 51 of the intake passage 1 (cavity 1) through which the intake air passes. The inlet-side cooling water pipe 29A that guides the engine cooling water to the space (groove 5T1 to 5T3) formed between the inner wall 51 and the outer wall 52 is connected to the outlet-side cooling water pipe 29B that discharges heated engine cooling water from the space (groove 5T1 to 5T3). The space (groove 5T1 to 5T3) is integrally formed around a pair of bearings 8 and 9 of the throttle shaft 3 that extends through the intake passage 1 (cavity 1) in a heat-conducting manner.

[0056] In this way, the bearing bosses 6 and 7 and the grooves 5T1 to 5T3 that serve as cooling water passages can be integrally formed from cast aluminum in the throttle body 5, thus simplifying manufacturing.

[0057] Specifically, the inlet-side cooling water pipe 29A and the outlet-side cooling water pipe 29B are located opposite to a pair of bearings 8, and are integrally formed with the plate portion 30 by bosses 30B1 and 30B2 for pressing and fixing the inlet-side cooling water pipe 29A and the outlet-side cooling water pipe 29B. By providing the pressing and fixing bosses 30B1 and 30B2 on the side of the plate portion 30, the problems of complex shape of the throttle body 5 or the need to configure other components can be avoided.

[0058] This embodiment describes the hardware structure of the throttle body 5 to cope with high intake air temperature. The following describes the control improvements when using the throttle body 5 of this embodiment.

[0059] In this embodiment, the temperature of the throttle body 5 is maintained at a constant temperature due to the cooling water, but the temperature of the throttle valve 2 changes due to variations in the intake air temperature. Therefore, the size of the throttle valve 2 changes due to thermal expansion caused by the change in intake air temperature. At this time, the diameter of the throttle valve 2 expands and increases due to the high temperature. If the cooling water temperature is low and the orifice diameter of the throttle body 5 is small, there is a risk of the orifice 1 becoming firmly connected to the throttle valve 2 when the valve closes completely during learning to full closure. To avoid this, the learning method is changed according to temperature conditions. Specifically, the orifice diameter of the throttle body 5 is estimated based on the cooling water temperature obtained from the water temperature sensor, and the valve diameter is estimated based on the intake air temperature obtained from the intake air temperature sensor, thereby determining whether learning can be performed and the contact pressure during learning. Specifically, a countermeasure is taken to not perform learning or to reduce the contact pressure during learning if the orifice diameter of the throttle body 5 is small and the valve diameter is large. At this time, the orifice diameter and valve diameter can be estimated based on operating conditions.

[0060] Furthermore, because the orifice diameter of the throttle body 5 and the valve diameter of the throttle valve 2 vary with temperature conditions, the temperature relationship obtained along with the fully closed angle during learning is maintained. This is used to correct the target opening degree corresponding to operating conditions, thereby improving the control accuracy of air volume. Specifically, when the orifice diameter and valve diameter change with temperature, even if the throttle valve 2 is opened at the same degree, the opening area will change, thus changing the flow rate. The amount of change in opening area is estimated based on the intake air temperature and coolant temperature, and the target opening degree is corrected accordingly. To improve the accuracy of this correction, the fully closed angle obtained through learning and the estimated temperatures of the throttle body 5 and throttle valve 2 are used.

[0061] At this point, regarding the fully closed learning, it is necessary to learn the angle at which the throttle body 5 is accurately closed to the fully closed state. Therefore, learning is performed by applying a push force to accurately close the throttle body 5 to the fully closed state, provided there is no risk of the throttle body 5 being fixedly connected to the throttle valve 2. The timing of this learning is based on the intake air temperature and coolant temperature to determine when there is no risk of the orifice 1 being fixedly connected to the throttle valve 2. Alternatively, key-on learning can be used instead of key-off learning. In addition, if the peeling force for opening the throttle valve 2 from fully closed is set to be greater than the push force for fully closing during learning, then even if the orifice 1 is in contact with the throttle valve 2, the throttle valve 2 can be opened without being fixedly connected.

[0062] On the other hand, the temperature difference between the orifice 1 and the throttle valve 2 can also be used to remove deposits adhering to the throttle body 5. When the intake air temperature is high and the valve diameter is large, it is presumed that the temperature of the deposits is also high, and the deposits soften. At this time, by closing the throttle valve 2 with the valve diameter increased, the deposits can be peeled off from the orifice 1. In order to prevent the throttle valve 2 from sticking to the deposits, it is preferable to set the peeling force when opening the valve to be stronger than the pushing force when it is fully closed.

[0063] (Summarize)

[0064] In this embodiment, the throttle valve control device includes: a throttle body 5 having an intake passage 1 for intake air flow; a throttle valve 2 for adjusting the amount of air passing through the intake passage 1; a throttle valve shaft 3 fixed to the throttle valve 2; and a first bearing 8 and a second bearing 9 rotatably supporting the throttle valve shaft 3. Flow paths 5T1 to 5T3 for the flow of heat exchange medium (cooling water) are formed in the throttle body 5. The diameter of the first bearing 8 is larger than the diameter of the second bearing 9. Flow paths 5T1 to 5T3 are arranged along the outer periphery of the intake passage 1 in a manner that overlaps with the second bearing 9 when viewed from the flow direction of the intake passage 1. The inlet portion 5T1 and the outlet portion 5T2 of flow paths 5T1 to 5T3 are arranged with the first bearing 8 as a barrier.

[0065] According to this embodiment configured as described above, the flow paths 5T1 to 5T3 through which the heat exchange medium flows are arranged along the outer periphery of the intake passage 1, overlapping with the second bearing 9 when viewed from the flow direction of the intake passage 1. Therefore, the outer periphery of the intake passage 1 can be cooled uniformly, and the second bearing 9 can be cooled efficiently. Furthermore, because the inlet portion 5T1 and the outlet portion 5T3 of the flow paths 5T1 to 5T3 are arranged with the first bearing 8 in between, the first bearing 8 can be cooled efficiently. Additionally, because the flow paths 5T1 to 5T3 are arranged without overlapping with the larger diameter first bearing 8, the size of the intake passage 1 of the throttle body 5 in the flow direction can be prevented from increasing.

[0066] Furthermore, in the throttle valve control device of this embodiment, the first bearing 8 is positioned closer to the motor 20 than the second bearing 9, which drives the throttle valve shaft 3. This reduces the distance from the inlet 5T1 of the cooling water passage to the motor 20, thereby improving the cooling efficiency of the motor 20.

[0067] Furthermore, in this embodiment, the throttle valve control device includes a motor 20 that drives the throttle shaft 3 and a throttle body fixing part 5H1 for fixing the throttle body 5. When viewed from the flow direction of the intake passage 1, the throttle body fixing part 5H1 is positioned between a straight line X1 passing through the rotation axis of the motor 20 and a straight line Z parallel to the rotation axis of the throttle shaft 3 and passing through the inlet portion 5T1 and the outlet portion 5T2 closer to the motor 20. This improves the vibration resistance of the throttle body 5.

[0068] Furthermore, in this embodiment, the throttle body fixing part 5H1, when viewed from the flow direction of the intake passage 1, is positioned between the straight line X1 passing through the rotation axis of the motor 20 and the straight line X2 passing through the rotation axis of the throttle shaft 3, and between the straight line Y1 passing through the opposite end face of the output side of the motor 20 and the straight line Y2 passing through the end face of the first bearing 8 side of the throttle body 5. This improves the vibration resistance of the motor 20.

[0069] In this embodiment, the inlet 5T1 of the flow paths 5T1 to 5T3 is positioned closer to the motor 20 than the outlet 5T3. As a result, the heat exchange medium (cooling water) passes near the motor 20 at a relatively low temperature, thus improving the cooling efficiency of the motor 20.

[0070] Example 2

[0071] For the valve control device of the second embodiment of the present invention, refer to... Figure 9 and Figure 10 Please provide an explanation.

[0072] In this embodiment, among the bearings 8 and 9 that hold the throttle shaft 3, the bearing 8, which sandwiches the intake passage 1 and is located on the side opposite to the gear cover 26, has a larger diameter. Therefore, the inlet 5T1 and outlet 5T2 of the cooling water passage are arranged such that the bearing 8 with the larger diameter is sandwiched between them. In addition, the inlet 5T1 of the cooling water passage is located closer to the motor 20 than the outlet 5T3. As a result, the heat exchange medium (cooling water) passes near the motor 20 at a relatively low temperature, thus improving the cooling efficiency of the motor 20.

[0073] In this embodiment configured as described above, the throttle body 5 can be prevented from becoming too large, just as in the first embodiment, and the first bearing 8 and the second bearing 9 of the throttle shaft 3 can be cooled efficiently.

[0074] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above embodiments and includes various modifications. For example, the above embodiments apply the present invention to an electric motor driven throttle valve control device for gasoline engine vehicles, but it can also be applied to an electric motor driven throttle valve control device for diesel engine vehicles. Furthermore, it can also be applied to a mechanical engine throttle valve control device. Moreover, it can also be applied to throttle valve control devices for EGR gas control and throttle valve control devices for generating negative pressure.

[0075] Explanation of reference numerals in the attached figures

[0076] 1…Cavity (intake passage), 2…Throttle valve, 3…Throttle shaft, 5…Throttle body, 5F1…Panel mounting part, 5F2…Panel mounting part, 5H1…Mounting hole (throttle body fixing part), 5T1…Gutter (flow path, inlet part), 5T2…Gutter (flow path), 5T3…Gutter (flow path, outlet part), 5W…Wall part, 6…Bearing boss, 7…Bearing boss, 8…Bearing (first bearing), 9…Bearing (second bearing), 10…Cover, 11…Throttle gear, 11…Gear, 11A…Fully open stop part, 11B…Fully closed stop part, 12…Metal plate, 13…Gear made of resin material 14...Reset spring, 15...Default spring, 16...Default rod, 17...Nut, 18...Conductor, 19...Resin retainer, 20...Motor, 20A...Motor housing, 20B...Bracket, 22...Gear, 23...Intermediate gear, 23A...Large diameter gear, 23B...Small diameter gear, 24...Gear shaft, 25...Wave-shaped washer, 26...Gear cover, 27...Clamping component, 28...TPS circuit board, 29A...Inlet side cooling water pipe, 29B...Outlet side cooling water pipe, 30...Plate section, 30B1, 30B2...Boss, 31...Sealing component, 51...Inner wall, 52...Outer wall.

Claims

1. A throttle valve control device, characterized in that, include: A throttle body that forms an intake passage for the flow of intake air; Throttle valve used to regulate the amount of air passing through the intake passage; Throttle shaft fixed to the throttle valve; The first and second bearings rotatably support the throttle body shaft; and The electric motor used to drive the throttle valve shaft, A flow path for the heat exchange medium is formed in the throttle body. The diameter of the first bearing is larger than the diameter of the second bearing, and the first bearing is positioned closer to the motor than the second bearing. The flow path is configured along the outer periphery of the intake passage in a manner that overlaps with the second bearing when viewed from the flow direction of the intake passage. The inlet and outlet of the flow path are configured with the first bearing as a barrier.

2. The throttle valve control device as described in claim 1, characterized in that: Includes a throttle body fixing part for fixing the throttle body. When viewed from the flow direction of the intake passage, the throttle body fixing part is positioned between a straight line passing through the rotation axis of the motor and a straight line parallel to the rotation axis of the throttle shaft and passing through the inlet and outlet portions closer to the motor.

3. The throttle valve control device as described in claim 1, characterized in that: Includes a throttle body fixing part for fixing the throttle body. When viewed from the flow direction of the intake passage, the throttle body fixing part is arranged between a straight line passing through the rotation axis of the motor and a straight line passing through the rotation axis of the throttle body, and is arranged between a straight line passing through the end face opposite to the output side of the motor and a straight line passing through the end face of the first bearing side of the throttle body.

4. The throttle valve control device as described in claim 1, characterized in that: The inlet is located on the side closer to the motor than the outlet.

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