Electronically controlled throttle device
By setting a filter circuit on the motor bracket and placing the inductor outside the motor, the problem of noise increase after the motor is solved, and effective noise reduction and inductance value increase are achieved.
Patent Information
- Application Number
- CN202180042590.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Priority Date
- 2020-07-09
- Filing Date
- 2021-07-06
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2041-07-06
AI Technical Summary
During the miniaturization of the motor, sufficient inductors cannot be installed to effectively reduce noise.
Set a filter circuit on the motor's tray, including inductors, capacitors and resistors, connect to the brush through soft braids, reduce noise, and place the inductor outside the motor to increase its inductance value.
While keeping the motor smaller, noise is effectively reduced and sufficient inductance value is ensured to reduce radiated noise.
Smart Images
Figure CN115803513B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to an electronically controlled throttle valve device. Background Art
[0002] Japanese Patent Application Publication No. 2013-155650 discloses a structure in which an inductor is installed in a motor of an electronically controlled throttle valve body. Specifically, a conductive path from a pair of terminals of the motor connected to a gear cover to a pair of terminals connected to a brush of the motor is cut off midway to expose the conductive path, and one end and the other end of two inductors are connected to a pair of ends of each of the cut conductive paths.
[0003] The inductor reduces radiation noise by blunting the current fluctuation per unit time through its inductance, but also has the purpose of suppressing high-frequency noise generated during switching. Therefore, the inductor is selected to a size that can be installed inside the motor.
[0004] Prior art literature
[0005] Patent Literature
[0006] Patent document 1: Japanese Patent Application Publication No. 2013-155650. Summary of the invention
[0007] Problem that the invention aims to solve
[0008] However, there has been a recent demand for miniaturization of the valve device itself, and the motor has been miniaturized accordingly, resulting in a problem that the mounting space in the motor has become smaller and an inductor with sufficient capacitance cannot be mounted.
[0009] An object of the present invention is to provide an electronically controlled throttle device capable of improving the reduction of motor noise while miniaturizing a motor.
[0010] Technical means of solving problems
[0011] In order to achieve the above-mentioned purpose, the present invention comprises: a valve body, which has a throttle valve; an electric motor with a brush, which drives the throttle valve; a bracket, which mounts the motor on the valve body; a soft braid, which is electrically connected to the brush and is arranged on the surface of the bracket on one side of the motor; and a filter circuit, which is electrically connected to the soft braid to reduce the noise of the motor, and the filter circuit is arranged on the surface of the bracket on the opposite side of the motor.
[0012] Effects of the Invention
[0013] According to the present invention, it is possible to improve the reduction of motor noise while reducing the size of the motor. Other problems, structures, and effects than those described above will become clear from the following description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is an exploded perspective view of an electric motor-driven electronically controlled throttle device used in gasoline engine vehicles.
[0015] Figure 2 It is a perspective view of an electric motor used in an electronically controlled throttle device.
[0016] Figure 3 It is an exploded perspective view of an electric motor used in an electronically controlled throttle device.
[0017] Figure 4 The present invention is a top view of a brush holder of an electric motor used in an electronically controlled throttle device, as viewed from the front.
[0018] Figure 5 This is a top view of a brush holder of an electric motor used in an electronically controlled throttle device, as viewed from the back.
[0019] Figure 6 It is a cross-sectional view of an electric motor-driven electronically controlled throttle device for a gasoline engine vehicle.
[0020] Figure 7 This is a top view of a gasoline engine vehicle with the gear cover removed from an electric motor-driven electronic throttle valve device.
[0021] Figure 8 The present invention is a perspective view of the appearance of an electric motor-driven electronically controlled throttle valve device used in gasoline engine vehicles. DETAILED DESCRIPTION
[0022] Embodiments of the present invention are described below with reference to the accompanying drawings.
[0023] The present embodiment relates to a valve body, an electronically controlled throttle valve body, a motor-driven throttle valve body, and a valve device for regulating the flow rate of a fluid in an internal combustion engine. In particular, the present embodiment relates to a motor-driven valve device that uses a DC motor (direct current motor) as an actuator and drives the DC motor with a rectangular wave pulse signal, i.e., a PWM (pulse width modulator) signal, and the valve device has an inductor that reduces radiation noise.
[0024] For example, the motor-driven valve device of this embodiment is an electronically controlled throttle device, which is installed on the intake passage of the internal combustion engine and is used to adjust the amount of air sucked into the cylinder in a gasoline engine vehicle and to control the pressure in the intake pipe in a diesel engine by variably controlling the cross-sectional area of the intake passage.
[0025] In addition, in gasoline engine vehicles, the electronically controlled throttle device can be used for both so-called direct fuel injection type engines that inject fuel directly into the cylinder and so-called port injection type engines that inject fuel into the intake pipe.
[0026] The purpose of this embodiment partially overlaps with the purpose of the present invention, and its purpose is to increase the inductance value within a limited space of an electronically controlled throttle device as a valve device, for example.
[0027] (Example)
[0028] according to Figure 1 to Figure 6 The structure of the electronically controlled throttle device of this embodiment will be described.
[0029] like Figure 1 As shown, the electronically controlled throttle device controls the amount of intake air by driving a throttle valve (hereinafter referred to as throttle valve 2) through a DC motor (hereinafter referred to as motor 20) whose rotation is controlled by PWM control. The throttle valve 2 is provided on an intake passage 1 for supplying air to the engine. The motor 20 is mounted on a motor housing 20A formed integrally with the throttle valve body 5.
[0030] like Figure 6 As shown, a reduction gear mechanism (composed of 22, 23A, 23B, 13) for transmitting the rotational force of the motor 20 to the rotation shaft of the throttle valve 2 (hereinafter referred to as the throttle shaft 3) is arranged on one side of the throttle body 5, and a cover 26 covering the reduction gear mechanism (composed of 22, 23A, 23B, 13) is fixed to the throttle body 5. A resin connector portion is provided on the cover 26, and the resin connector portion is formed with positive and negative electrical terminals (not shown) for supplying power to the motor 20.
[0031] While holding the brush 20BR ( Figure 5 ) brush holder 20BH( Figure 3 ) is integrally molded with an inductor holder 31H ( Figure 4 ).
[0032] like Figure 4 As shown, the inductor holder 31H is provided between the motor external connection terminal 20MT1 and the motor internal connection terminal 20MT2. The motor external connection terminal 20MT1 is connected to the terminal arranged on the cover 26, and the motor internal connection terminal 20MT2 is connected to the soft pigtail 20PG ( Figure 5 )connect.
[0033] In this embodiment, the electronically controlled throttle device includes: a throttle body 5 (valve body) having a throttle valve 2; a motor 20 with a brush that drives the throttle valve 2; a bracket 20F that mounts the motor 20 on the throttle body 5; a pigtail 20PG that is electrically connected to the motor brush 20BR (brush) and is provided on the surface of the bracket 20F on one side of the motor 20; and a filter circuit (inductor 31, capacitor 32, resistor 33) that is electrically connected to the pigtail 20PG and reduces the noise of the motor. The filter circuit is provided on the side of the bracket opposite to the motor 20. Thus, a large inductor 31 can be provided outside the motor 20. As a result, the capacitance of the inductor 31 can be increased.
[0034] The inductor 31 is fixed to the inductor holder 31H by an adhesive.
[0035] The resistor 33 and the capacitor 32 are also connected to the motor internal connection terminal 20MT2 to which the inductor 31 is connected, and are grounded via the motor bracket 20F, thereby achieving a noise reduction effect together with the inductor 31 .
[0036] Here, regarding the connection position of the capacitor 32, compared with connecting it to the motor external connection terminal 20MT1 located behind the inductor 31 relative to the motor (soft pigtail 20PG), when it is connected to the motor internal connection terminal 20MT2 located in front of the inductor 31, the length of the noisy wiring becomes shorter, so the noise reduction effect is high.
[0037] In this case, the resistor 33 and the capacitor 32 may be mounted on the motor side of the motor bracket 20F ( Figure 5 The surface side shown) can also be the opposite side ( Figure 4 side of the surface shown).
[0038] In other words, in this embodiment, if Figure 4 As shown, the filter circuit includes a capacitor 32 electrically connected to the pigtail 20PG and a resistor 33 electrically connected to the pigtail 20PG. The capacitor 32 and the resistor 33 are arranged on the surface of the bracket 20F on one side of the motor 20, but the capacitor 32 and the resistor 33 can also be arranged on the surface of the bracket 20F on the opposite side of the motor 20.
[0039] like Figure 5 As shown, a spring bracket 20SH is arranged on the brush holder 20BH, and a motor spring 20BS held on the spring bracket 20SH moves the motor brush 20BR toward the motor shaft 20S ( Figure 3) is pushed. In addition, a braid wire pressing plate 20PH for holding a braid wire 20PG is arranged on the brush holder 20BH to hold the braid wire 20PG, which is used to connect the motor internal connection terminal 20MT2 and the motor brush 20BR. Since the braid wire 20PG needs to move as the motor brush 20BR wears, the braid wire 20PG is held in a state with a margin of length.
[0040] like Figure 3 As shown, a ball bearing 20BB is held on the brush holder 20BH, and supports one end of a motor shaft 20S. A commutator 20C and an armature 20AM are fixed to the motor shaft 20S.
[0041] The brush holder 20BH is fixed to the cylindrical yoke 20Y, and a plane bearing 20PB is held on the opposite side of the cylindrical yoke 20Y to the side holding the brush holder 20BH, and holds the other end of the motor shaft 20S.
[0042] Furthermore, the magnet 20M is held by the cylindrical yoke 20Y via the magnet stay 20H.
[0043] Next, refer to Figures 1 to 8 An example in which the electric motor is applied to an electronically controlled throttle device for a gasoline engine will be specifically described.
[0044] like Figure 6 As shown, an intake passage 1 (hereinafter referred to as a hole portion 1A) and a motor case 20A for accommodating a motor 20 are molded together with a throttle valve assembly (throttle body 5) made of aluminum die casting.
[0045] A metal rotating shaft (hereinafter referred to as throttle shaft 3) is arranged along one diameter line of the hole 1A on the throttle body 5. Both ends of the throttle shaft 3 are rotatably supported by needle bearings as bearings 8 and 9. The bearings 8 and 9 are press-fitted and fixed into bearing bushings 6 and 7 provided on the throttle body 5.
[0046] The bearing 9 is pressed into the throttle body 5 after the throttle shaft 3 is pressed into the throttle body 5. Then, the bearing 9 is pressed by the cover 10 pressed into the throttle body 5 to limit the axial movable amount of the throttle shaft 3. In this way, the throttle shaft 3 is rotatably supported by the throttle body 5.
[0047] On the throttle shaft 3, a throttle valve (hereinafter referred to as the throttle valve 2) composed of a circular plate made of a metal material is inserted into a slit provided on the throttle shaft 3 and fixed to the throttle shaft 3 by a screw 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 1, thereby controlling the intake air flow rate to the engine.
[0048] like Figure 6 and Figure 7 As shown, the motor housing 20A is formed substantially parallel to the throttle shaft 3, and the motor 20 composed of a brush-type DC motor is inserted into the motor housing 20A, and the motor bracket 20F ( Figure 7 ) and is fixed to the side wall of the throttle valve body 5. Figure 6 As shown, a wave washer 25 is provided at the end of the motor 20 to hold the motor 20 .
[0049] like Figure 6 As shown, the openings of the bearing bushings 6 and 7 are sealed by the bearings 8 and the cover 10, forming a shaft seal and maintaining airtightness. In addition, the cover 10 on the side of the bearing bushing 7 prevents the end of the throttle shaft 3 and the bearing 9 from being exposed. This prevents the air from leaking from the bearings 8 and 9, or the grease for lubricating the bearings 8 and 9 from leaking into the outside air or the sensor chamber described later.
[0050] A metal gear 22 with the least number of teeth is fixed to the end of the rotating shaft of the motor 20. A reduction gear mechanism and a spring mechanism for rotationally driving the throttle shaft 3 are centrally arranged on the side of the throttle body on which the gear 22 is provided. These mechanism parts are covered by a cover (hereinafter referred to as a gear cover) 26 made of a resin material fixed to the side of the throttle body 5.
[0051] like Figure 6 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 is composed of a metal plate 12 and a resin material gear portion 13 formed by resin on the metal plate 12. The resin material gear portion 13 is molded on the metal plate 12 by resin molding.
[0052] The metal plate 12 has a hole in the center. The top end of the throttle shaft 3 is inserted into the hole of the metal plate 12, and the nut 17 is screwed into the threaded portion, thereby fixing the metal plate 12 to the throttle shaft 3. The metal plate 12 and the resin material gear portion 13 formed thereon rotate together with the throttle shaft 3.
[0053] A default spring 15 formed of a coil spring is sandwiched between the back of the throttle gear 11 and the default lever 16. In addition, a return spring 14 formed of a coil spring is sandwiched between the back of the default lever 16 and the side of the throttle valve body 5. By pulling these two springs 14 and 15 in the opening direction and the closing direction, a default mechanism is formed that adjusts the opening of the throttle valve 2 to a specified opening (hereinafter referred to as the default opening) when the power supply of the motor 20 is OFF.
[0054] Since the present embodiment relates to a throttle valve control device for gasoline, the initial position of the throttle valve 2, that is, the opening position of the throttle valve 2 assigned as the initial position when the power supply of the motor 20 is cut off, is the default opening. Therefore, when the throttle valve 2 is opened to a greater extent than the default opening, a load in the closing direction toward the default opening is applied by the return spring 14, and when the throttle valve 2 is closed to a greater extent than the default opening, a load in the opening direction toward the default opening is applied by the default spring 15.
[0055] An intermediate gear 23 ( Figure 7 ), the intermediate gear 23 is rotatably supported by a gear shaft 24 made of a metal material pressed into and fixed to the side of the throttle valve body 5. Figure 6 As shown, the intermediate gear 23 is composed of a large diameter gear 23A meshing with the gear 22 and a small diameter gear 23B meshing with the throttle gear 11. The two gears 23A and 23B are integrally formed by resin molding. These gears 22, 23A, 23B, and 11 constitute a two-stage reduction gear mechanism. Therefore, the rotation of the motor 20 is transmitted to the throttle shaft 3 through the reduction gear mechanism.
[0056] Here, in order to prevent interference with the large diameter gear 23A, the inductor 31 is mounted at a position on the opposite side of the motor shaft 20S and the large diameter gear 23A. At this time, at least one of the pigtails 20PG inside the motor 20 is arranged on the opposite side of the large diameter gear 23A with respect to the motor shaft 20S, so the inductor 31 and the pigtail 20PG are arranged at a position where they overlap with the bracket 20F.
[0057] In other words, the filter circuit is arranged to overlap the pigtail 20PG via the bracket 20F in the axial direction of the motor 20. Specifically, the filter circuit includes an inductor 31 electrically connected to the pigtail 20PG, and the inductor 31 is arranged to overlap the pigtail 20PG via the bracket 20F in the axial direction of the motor 20.
[0058] The electronically controlled throttle device includes: a gear 22 (first gear) mounted on one end of the shaft of the motor 20; a throttle shaft 3 mounted on the throttle valve 2; a throttle gear 11 (second gear) mounted on one end of the throttle shaft 3; and an intermediate gear 23 (third gear) that transmits the rotation of the gear 22 (first gear) to the throttle gear 11 (second gear). The inductor 31 is located on the opposite side of the intermediate gear 23 (third gear) across the shaft of the motor 20. Since the inductor 31 is away from the intermediate gear 23, the inductor 31 can be enlarged without interfering with the intermediate gear 23.
[0059] These speed reduction mechanisms and spring mechanisms are covered by a gear cover 26 made of a resin material. A groove for inserting a sealing member 30 is formed on the peripheral edge of the opening end of the gear cover 26. When the sealing member 30 is installed in the groove and the gear cover 26 is covered on the throttle valve body 5, the sealing member 30 is in close contact with the end surface of the frame around the gear storage chamber formed on the side of the throttle valve body 5, and the gear storage chamber is shielded from contact with the outside air. Figure 8 As shown, in this state, the gear cover 26 is fixed to the throttle valve body 5 by six clips 27 .
[0060] Next, the throttle sensor which is a rotation angle detection device formed between the reduction gear mechanism configured in this manner and the gear cover 26 covering the reduction gear mechanism will be described in detail.
[0061] like Figure 6 As shown, the resin bracket 19 is fixed to the end of the throttle shaft 3 on the gear cover side by press-fitting through the insert 29. The conductor 18 ( Figure 7 ) is integrally molded and mounted on the flat surface of the top end of the resin bracket 19. Therefore, when the motor 20 rotates and the throttle valve 2 rotates, the conductor 18 also rotates integrally.
[0062] TPS substrate 28( Figure 6 ) is fixed to the gear cover 26 at a position facing the conductor 18. The ASIC arranged on the TPS substrate 28 detects the angle of the conductor 18, thereby detecting the opening of the throttle valve 2, and provides it to the ECU as a sensor output.
[0063] 5P1 to 5P3 provided on the throttle body 5 are walls for positioning the gear cover 26. The positioning protrusions of the gear cover 26 are locked on the walls of these three locations, so that the TPS substrate 28 and the conductor 18 on the rotating side can be positioned and a signal within the required allowable range can be output. The full-open stopper 11A mechanically determines the full-open position of the throttle gear 11 and is composed of a protrusion formed integrally on the side wall of the throttle body.
[0064] The notch terminal end of the throttle gear 11 abuts against the protrusion, so that the throttle shaft 3 cannot rotate beyond the fully open position.
[0065] The fully closed stopper 11B limits the fully closed position of the throttle shaft 3, and the terminal end on the opposite side of the throttle gear 11 collides with the fully closed stopper 11B at the fully closed position, preventing the throttle shaft 3 from rotating beyond the fully closed position.
[0066] By adopting the inductor mounting structure of the present invention to the throttle valve control device formed in this way, a throttle valve control device with less radiated noise can be obtained.
[0067] As described above, according to the present embodiment, it is possible to improve the reduction of motor noise while miniaturizing the motor 20 .
[0068] In addition, the present invention is not limited to the above-mentioned embodiments, but also includes various modified examples. For example, the above-mentioned embodiments are examples described in detail in order to easily explain the present invention, and are not necessarily limited to having all the structures described. In addition, a part of the structure of a certain embodiment can be replaced with the structure of other embodiments, and in addition, the structure of other embodiments can be added to the structure of a certain embodiment. In addition, for a part of the structure of each embodiment, other structures can be added, deleted, or replaced.
[0069] In addition, the embodiments of the present invention may be in the following aspects.
[0070] (1) An electronically controlled throttle device, comprising: a valve body having a throttle valve; an electric motor with a brush; a bracket in contact with the electric motor and connected to the valve body; and a circuit element for suppressing noise transmitted from the electric motor, wherein the bracket has a pigtail portion connected to the brush and arranged on a side where the electric motor is arranged, and when viewed from the axial direction of the rotating shaft of the electric motor, the circuit element is arranged on the opposite side of the side where the electric motor is arranged with the pigtail portion as a boundary and is arranged at a position overlapping with the pigtail portion.
[0071] (2) The electronically controlled throttle device according to (1), wherein the circuit element includes an inductor, a capacitor, and a resistor.
[0072] (3) The electronically controlled throttle device according to (2), wherein the circuit element overlapping the pigtail is an inductor.
[0073] (4) The electronically controlled throttle device according to (3), wherein the capacitor and the resistor are arranged closer to the armature coil side than the inductor.
[0074] (5) The electronically controlled throttle device according to (4), wherein the capacitor and the resistor are arranged on a side of the motor bracket opposite to the armature coil.
[0075] (6) The electronically controlled throttle device according to (4), wherein the capacitor and the resistor are arranged on the armature coil side of the motor bracket.
[0076] In this way, the inductor is not mounted inside the motor but is mounted on the side of the bracket for fixing the motor to the valve device opposite to the coil of the motor, that is, outside the motor.
[0077] According to (1) to (6), since a space wider than the interior of the motor can be secured, an inductor having a larger inductance can be provided, and an inductor that is sufficient to reduce the radiation noise of the motor can be mounted.
[0078] Explanation of symbols
[0079] 1A…hole portion, 1B…hole portion, 2…throttle valve, 3…throttle shaft, 4…screw, 5…throttle valve body, 5P1…wall, 5P2…wall, 5P3…wall, 5S…fitting portion, 6…bearing bush portion, 7…bearing bush portion, 8…bearing, 9…bearing, 10…cover 11…throttle gear, 11G…groove portion, 11W…window portion, 11B…full-close stopper, 12…metal plate, 13…resin material gear portion, 14…return spring, 15…default spring, 16…default rod, 17…nut, 17P…protrusion, 18…conductor, 19…resin bracket, 20…motor, 20A…motor housing, 20F…bracket, 21…screw, 22…gear, 23…intermediate gear, 23A…large diameter gear, 23B…small diameter gear, 24…gear shaft, 25…wave washer, 26…gear cover, 27…clip, 28…TPS substrate, 29…embedded object, 30…sealing member, 20BR…motor brush, 20BH…brush holder, 31…inductor, 32…capacitor, 33…resistor, 20MT1…motor external connection terminal, 20MT2…motor internal connection terminal, 20SH…spring bracket, 20S…motor shaft, 20BB…ball bearing, 20PB…plane bearing, 20AM…armature, 20C…commutator, 20Y…cylindrical yoke, 20H…magnet stay, 20M…magnet, 20PG…braided wire, 20PH…braided wire pressure plate.
Claims
1. An electronically controlled throttle device, characterized in that: have: a valve body having a throttle valve; a motor with brushes, which drives the throttle valve; a bracket for mounting the motor on the valve body; a pigtail wire electrically connected to the brush and disposed on a surface of the bracket on one side of the motor; as well as A filter circuit is electrically connected to the soft braid wire to reduce the noise of the motor. The filter circuit is provided on a surface of the bracket on the opposite side of the motor, The soft braid wire is composed of a first soft braid wire and a second soft braid wire, The filtering circuit comprises: A first inductor, electrically connected to the first pigtail; a second inductor electrically connected to the second pigtail, The first inductor and the second inductor are arranged in a V-shape on a surface of the bracket on the side opposite to the motor. The first pigtail is arranged to overlap with the first inductor from one end to the other end of the first inductor via the bracket in the axial direction of the motor. The second pigtail is arranged to overlap with the second inductor from one end to the other end of the second inductor via the bracket in the axial direction of the motor.
2. The electronically controlled throttle device according to claim 1, characterized in that , The filter circuit includes: a capacitor electrically connected to the pigtail; and a resistor electrically connected to the pigtail, The capacitor and the resistor are provided on a surface of the bracket on one side of the motor.
3. The electronically controlled throttle device according to claim 1, characterized in that: The filter circuit includes: a capacitor electrically connected to the soft pigtail; and a resistor electrically connected to the soft pigtail. The capacitor and the resistor are provided on a surface of the bracket on the opposite side of the motor.
4. The electronically controlled throttle device according to claim 1, characterized in that: A first gear mounted on one end of the shaft of the motor; a throttle shaft, on which the throttle valve is installed; A second gear mounted on one end of the throttle shaft; and a third gear that transmits the rotation of the first gear to the second gear, The first inductor and the second inductor are located on opposite sides of the third gear across the shaft of the motor.