JP2017142100A - Rotation angle detector and diaphragm valve controller having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inductance type rotation angle detector which can accurately adjust a distance between an excitation conductor and an excitation conductor and has high productivity and reliability, and to provide a motor drive type diaphragm valve controller having the same.SOLUTION: There is provided a rotation angle detector which has a rotation shaft 500A, a resin holder 400A that is fixed to the rotation shaft 500A and has an excitation conductor 100D provided thereon, a case member covering the resin holder 400A, and an excitation conductor that is arranged at a position facing the excitation conductor 100D and is fixed to the case member side and a signal detection conductor, where the resin holder 400A is joined to the rotation shaft 500A by welding, and a first groove 500D and a second groove 500E having mutually different angles to a shaft direction of the rotation shaft 500A are formed on the outer peripheral surface of the rotation shaft 500A.SELECTED DRAWING: Figure 3

Description

  The present invention rotates using the fact that the inductance between the conductor attached to the rotating shaft of the rotating body and the coil conductor attached to the stator facing the rotor changes according to the positional relationship between the two. The present invention relates to a rotation angle detection device that detects a rotation position of a conductor.

  A motor-driven throttle valve control apparatus that electrically controls an opening area of an air passage of an internal combustion engine with a throttle valve driven by a motor, the rotation angle described above for detecting the rotation angle of the throttle valve The present invention relates to a device provided with a detection device.

  As a background art of this technical field, an inductance type rotation angle detection device described in JP 2012-247323 A (Patent Document 1) is known. In this background art, an excitation conductor is attached to the tip of a rotary shaft to which a throttle valve is attached, and an excitation conductor and a signal detection conductor are arranged on the gear cover so as to face the excitation conductor (see the summary). More specifically, a cylindrical portion of the resin holder is integrally formed by resin molding with the rotation shaft as an insert member at the tip of the rotation shaft as the rotation detection body. A disc portion is integrally formed at the end of the cylindrical portion of the resin holder, and the excitation conductor is integrally formed on the surface of the disc portion when the resin holder is integrally formed with the rotating shaft. (See paragraphs 0018 and 0019).

  The rotating shaft is provided with a groove inside the cylindrical portion of the resin holder, and this groove prevents the resin holder from falling off the rotating shaft. Further, the rotating shaft is provided with two flat portions so as to sandwich the central axis thereof, and the resin holder is prevented from rotating with respect to the rotating shaft. That is, the two flat portions constitute a detent mechanism (see paragraphs 0020 and 0021).

  Patent Document 1 discloses a joining method in which an adhesive is applied to the tip of the rotating shaft and the resin holder is press-fitted into the rotating shaft as a joining method of the rotating shaft and the resin holder (see paragraph 0021).

JP 2012-247323 A

  In the inductance type rotation angle detection device of Patent Document 1, the resin holder is integrally formed by resin molding using the rotation shaft as an insert member. Moreover, the flat part provided in the rotating shaft comprises the rotation prevention mechanism of the resin holder with respect to the rotating shaft.

  In the resin holder molding method in which the resin holder is integrally molded by resin molding using the rotary shaft as an insert member, it is difficult to accurately adjust the distance between the excitation conductor and the excitation conductor. However, there is a problem that productivity is poor and an inexpensive rotation detector cannot be provided.

  On the other hand, in the method in which an adhesive is applied to the tip of the rotating shaft and the resin holder is press-fitted into the rotating shaft, the distance between the excitation conductor and the exciting conductor can be adjusted with high precision. The groove impairs the effect of preventing the resin holder from falling off. That is, the effect of preventing the groove from being lost is impaired. For this reason, in order to enhance the adhesive effect of the adhesive, it is necessary to strictly manage the adhesive application state (adhesive application position and application amount), which is equivalent to improving the reliability of the rotation angle detection device. There was a problem of requiring labor.

  An object of the present invention is to provide a highly productive and reliable inductance-type rotation angle detection device capable of adjusting the distance between the excitation conductor and the excitation conductor, and a motor-driven throttle valve control device including the inductance-type rotation angle detection device. It is to provide.

In order to solve the above problems, the present invention
A rotation shaft, a resin holder fixed to the rotation shaft and provided with an excitation conductor, a case member covering the resin holder, an excitation conductor disposed at a position facing the excitation conductor and fixed to the case member side, and In a rotation angle detection device comprising a signal detection conductor,
The resin holder is joined to the rotating shaft by welding,
A first groove and a second groove having different angles with respect to the axial direction of the rotating shaft are formed on the outer peripheral surface of the rotating shaft.

  By adopting the structure as in the present invention, the distance between the excitation conductor and the excitation conductor can be adjusted with high precision, so that a predetermined sensor output can be obtained with high precision, and an inductance type rotation angle with high productivity and reliability. A detection device and a motor-driven throttle valve control device including the detection device can be obtained.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

The principal part expanded sectional view of the inductance type non-contact-type rotation angle detection apparatus based on one Example of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of main components of an inductance-type non-contact rotation angle detection device according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a rotating shaft and a conductive pair of an inductance-type non-contact rotation angle detecting device according to an embodiment of the present invention. The expanded sectional view of the resin holder detent | locking part of the inductance type non-contact-type rotation angle detection apparatus based on one Example of this invention. 1 is a cross-sectional view of a motor-driven throttle valve control device used in a diesel engine vehicle according to an embodiment of the present invention. 1 is an exploded perspective view of a gear cover of a motor-driven throttle valve control device used for a diesel engine vehicle according to an embodiment of the present invention. 1 is an external perspective view of a motor-driven throttle valve control device used in a diesel engine vehicle according to an embodiment of the present invention. The perspective view which removed the gear cover of the motor drive type throttle valve control apparatus used for the diesel engine vehicle based on one Example of this invention. 1 is an exploded perspective view of a motor-driven throttle valve control device used in a diesel engine vehicle according to an embodiment of the present invention. The top view of the gear storage chamber of the motor drive type throttle valve control apparatus used for the diesel engine vehicle based on one Example of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  An embodiment of a non-contact type inductance type rotation angle detection device according to the present invention will be described with reference to FIGS.

  FIG. 1 is an enlarged cross-sectional view of a main part of an inductance-type non-contact rotation angle detection device according to an embodiment of the present invention. FIG. 3 is an exploded perspective view of a rotating shaft and a conductive pair of an inductance-type non-contact rotation angle detecting device according to an embodiment of the present invention.

  As shown in FIGS. 1 and 3, the excitation conductor 100D is integrally formed with the resin holder 400A. The resin holder 400A is held on the rotary shaft 500A by welding.

  The rotary shaft 500A is provided with a groove 500D and a groove 500E. The resin in the resin holder 400A melted by welding flows into the groove 500D and the groove 500E, and the resin holder 400A is held on the rotary shaft 500A. Here, the groove 500D is a retaining groove (a retaining part), and the groove 500E is a rotation preventing groove (a rotation preventing part). Since a plurality of grooves 500D are provided on the rotating shaft 500A, the holding force borne by one groove can be reduced, and the wrap margin between the resin holder 400A and the rotating shaft 500A can be reduced. The weight generated at the time of fitting can be reduced, and the risk of damage to the resin holder 400A can be reduced.

  The groove 500D and the groove 500E have a redundancy function for the excitation conductor 100D to rotate in synchronization with the rotation shaft 500A when the bonding due to welding between the rotation shaft 500A and the resin holder 400A loses its function. . As a result, in this embodiment, the excitation conductor 100D rotates in synchronization with the rotation shaft 500A when the bonding due to welding between the rotation shaft 500A and the resin holder 400A loses its function due to the grooves 500D and 500E. Retainant design has been realized.

  In this embodiment, since the resin holder 400A is held on the rotary shaft 500A by welding, the distance between the excitation conductor and the excitation conductor described later can be adjusted with high accuracy, and an inductance that can obtain a predetermined sensor output with high accuracy. Type rotation angle detection device and motor-driven throttle valve control device including the same. In addition, an inductance-type rotation angle detection device with high productivity and a motor-driven throttle valve control device including the same can be obtained without requiring a large facility for molding.

  Here, from the viewpoint of improving productivity, the groove 500E may have a spiral shape such as a screw. Even if a rotational force that rotates the resin holder 400A like a screw is applied, the resin holder 400A receives a force in the removal direction by the groove 500E, and the groove 500D is prevented from coming off at this time, and thus rotates. I can't. Further, when the intersecting portion of the groove 500D and the groove 500E is fitted to the resin holder 400A like a wedge, the rotation is more firmly prevented. In this manner, the retaining groove 500D plays a part of the rotation preventing function of the rotation preventing groove 500E.

  Further, the rotation-preventing groove 500E can also have a retaining effect, and has a part of the retaining function.

  In this embodiment, the groove 500D is an intersection line between the outer peripheral surface of the rotation axis 500A and the virtual plane when a plane (virtual plane) perpendicular to the central axis 500F of the rotation axis 500A intersects the rotation axis 500A. It is formed on the outer peripheral surface of the rotating shaft 500A so as to form an annular shape along the axis. On the other hand, the groove 500E is along the intersection line between the outer peripheral surface of the rotation shaft 500A and the virtual plane when a plane (virtual plane) inclined with respect to the central axis of the rotation shaft 500A intersects the rotation shaft 500A. It is formed on the outer peripheral surface of rotating shaft 500A so as to form an annular shape. Here, “along the line of intersection” includes not only the case where the line coincides with the line of intersection but also the case where the direction of the line of intersection is generally directed. For example, it includes the case of undulation in the direction of the central axis 500F of the rotation axis 500A, and the case of drawing a curve so as to intersect the intersection line at one point and deviate from the intersection line on both sides thereof.

  Hereinafter, the groove shape such as the groove 500D is referred to as a groove perpendicular to the central axis 500F of the rotation shaft 500A, and the groove shape such as the groove 500E is referred to as a groove inclined to the center axis 500F of the rotation shaft 500A. That is, the groove 500D is a groove formed on the outer peripheral surface of the rotary shaft 500A and perpendicular to the axial direction of the rotary shaft 500A, and the groove 500E is an axis of the rotary shaft 500A formed on the outer peripheral surface of the rotary shaft 500A. The groove is inclined with respect to the direction.

  In the present embodiment, the groove 500D and the groove 500E have a function of preventing rotation because the inclination angles of the rotation axis 500A with respect to the central axis 500F are different from each other, and the resin holder 400A of the rotation axis 500A It constitutes a rotation prevention mechanism. That is, the groove 500E is formed on the outer peripheral surface of the rotation shaft 500A so as to have an angle larger than 0 ° with respect to the groove 500D.

  For example, the groove 500D may be configured as a groove inclined to the central axis 500F of the rotation shaft 500A in the opposite direction to the groove 500E. In this case, when a force that rotates the resin holder 400A acts on the rotation shaft 500A, the groove 500D and the groove 500E displace the resin holder 400A in opposite directions in the direction of the central axis 500F of the rotation shaft 500A. Generate power. For this reason, the groove 500D and the groove 500E prevent the resin holder 400A from being displaced in the direction of the central axis 500F of the rotation shaft 500A, and as a result, prevent the resin holder 400A from rotating with respect to the rotation shaft 500A.

  The groove 500D and the groove 500E may be inclined in the same direction with respect to the central axis 500F of the rotating shaft 500A. This is smaller than when formed perpendicular to the central axis 500F of the rotary shaft 500A.

  Further, the rotary shaft 500A is provided with flat portions 500B and 500C, and by disposing these, the resin holder 400A is prevented from rotating with respect to the rotary shaft 500A.

  If the groove 500D and the groove 500E can serve as a rotation stopper, it is not necessary to provide the flat portions 500B and 500C. By providing the flat portions 500B and 500C, the range in which the groove 500D and the groove 500E can be provided on the outer peripheral surface of the rotating shaft 500A is narrowed. In particular, since the flat portions 500B and 500C do not have a retaining function, when the flat portions 500B and 500C are provided, the effect of retaining the groove 500D is reduced. In addition, the effect of preventing rotation by the groove 500E is reduced by reducing the effect of retaining the groove 500D, but the effect of preventing rotation by the flat portions 500B and 500C is obtained. The plane portions 500B and 500C may be provided or determined in consideration of the effect of preventing rotation and the effect of retaining.

  In this embodiment, the resin holder 400A is held on the rotary shaft 500A by welding, and the resin of the melted resin holder 400A flows into the grooves 500D and 500E during welding, thereby preventing the resin holder 400A from coming off from the rotary shaft 500A. Thus, the highly reliable inductance type rotation angle detection device and the motor drive type throttle valve control device including the same can be obtained.

  FIG. 4 is an enlarged cross-sectional view of the resin holder detent portion of the inductance-type non-contact rotation angle detection device according to one embodiment of the present invention.

  As shown in FIG. 4, the inner diameter D400A of the resin holder 400A is smaller than the outer diameter D500A of the rotating shaft 5A. 400A1, 400A2, 400A3, and 400A4 are formed, thereby forming a detent mechanism between the resin holder 400A and the rotating shaft 500A.

  FIG. 2 is a perspective view of main components of an inductance-type non-contact rotation angle detection device according to an embodiment of the present invention.

  As shown in FIG. 2, the excitation conductor 100D is adjacent to a linear portion 100D1 extending radially in the radial direction and an arc-shaped portion 100D2 provided so as to connect the inner peripheral sides of the adjacent linear portions 100D1. It is comprised from the arc-shaped part 100D3 provided so that the outer peripheral sides of linear part 100D1 might be connected. Six straight portions 100D1 are arranged at intervals of 60 degrees.

  As shown in FIG. 1, a fixed substrate 300 is fixed to a case 200 </ b> A of a sensor (inductance type rotation angle detection device) with an adhesive so as to face the excitation conductor 100 </ b> D. The fixed substrate 300 is protected from abrasion powder and corrosive gas by applying a coating agent to the front and back surfaces after being bonded to the sensor case 200A.

  As shown in FIG. 2, terminals 300 </ b> K <b> 1 to 300 </ b> K <b> 4 molded in case 200 </ b> A are electrically connected to fixed substrate 300.

  Four annular excitation conductors 300A are printed on the front side (the side facing the excitation conductor 100D) of the fixed substrate 300 that is an insulating substrate. In addition, a plurality of radially detecting signal detection conductors 300B are printed. An excitation conductor 300A and a signal detection conductor 300B similar to those on the front side are also printed on the back side (the side opposite to the side facing the excitation conductor 100D) of the fixed substrate 300, and the excitation conductor 300A and the signal detection conductor 300B on the front and back sides pass through. They are connected by holes 300C to 300F.

  In this embodiment, a three-phase AC signal that is 120 degrees out of phase is obtained from the signal detection conductor 300B.

  In addition, two sets of the same non-contact type rotation detection device are formed, and are configured to detect sensor abnormality by comparing each other's signals and to back up each other in case of abnormality.

  300L and 300M are microcomputers, which have drive control and signal processing functions for each non-contact type rotation angle detection device.

  One of the terminals 300K1 to 300K4 functions as a power supply terminal (for example, 300K1), one functions as a ground terminal (for example, 300K3), and the remaining two 300K2 and 300K4 function as signal output terminals of the respective rotation angle detection devices. By arranging the ground terminal between the signal terminals, it is possible to prevent the signal terminals from being short-circuited to cause both signals to be in an abnormal state at the same time.

  The microcomputers 300L and 300M supply a current from the power supply terminal 300K1 to the excitation conductor 300A, process the three-phase alternating current waveform generated in the signal detection conductor 300B, and detect the rotational position of the excitation conductor 100D. The rotation angle of the rotation shaft 500A is detected.

  Hereinafter, the operation of the non-contact type inductance rotation angle detection device of the present embodiment will be described.

  It can be considered that the microcomputer 300M basically controls the conductor pattern groups 300A and 300B constituting the first rotation angle detection device formed on the front side of the fixed substrate 300 of FIG. On the other hand, it may be considered that the microcomputer 300L basically controls the conductor pattern groups 300A and 300B constituting the second rotation angle detection device formed on the back side of the fixed substrate 300 of FIG. Each of the computers 300L and 300M supplies a direct current Ia from the power supply terminal 300K1 to the exciting conductor 300A.

  When the direct current Ia flows through the exciting conductor 300A, a current IA opposite to the current Ia is excited in the outer arcuate conductor 100D3 of the exciting conductor 100D facing the exciting conductor 300A. This excited current IA flows in the direction of the arrow through the entire excitation conductor 100D. The current IR flowing in the radial conductor 100D1 induces a current Ir in the opposite direction to the current IR in the radial conductor portion of the signal detection conductor 300B facing this portion. This current Ir becomes an alternating current.

  Three sets of phase (U, V, W phase) patterns for the first rotation angle detection device are formed by the front 36 signal detection conductors 300B arranged radially at equal intervals, and the back 36 signal detection conductors 300B. Thus, three sets of phase (U, V, W phase) patterns of the second rotation angle detecting device are formed.

  The alternating current Ir is an alternating current that is 120 degrees out of phase in each of the U, V, and W phases when the excitation conductor 100D is in a specific rotational position, for example, a start position (position where the rotational angle is zero).

  When the disc portion 400A5 of the resin holder 400A in which the excitation conductor 100D is disposed rotates, the phases of these three-phase alternating currents are shifted from each other. The microcomputers 300L and 300M detect this phase shift, and detect how much the excitation conductor 100D has rotated based on the phase shift.

  The two signal currents of the first and second rotation angle detection device signals input from the signal detection conductor 300B to the microcomputers 300L and 300M basically have the same value. The microcomputers 300L and 300M process the same signal current, and output signal voltages having the same amount of change and opposite slopes from the signal terminals 300K1 to 300K4. This signal is a signal proportional to the rotation angle of the disc portion 400A5. The external device that has received this signal monitors both signals to determine whether the first and second rotation angle detection devices are normal. If either indicates an abnormality, the remaining detection device signal is used as the control signal.

  Next, an example in which the non-contact type inductance rotation angle detection device is applied to a motor-driven throttle valve (throttle valve) control device for a diesel engine will be specifically described with reference to FIGS.

  FIG. 5 is a main sectional view thereof, and FIGS. 6 to 10 are exploded perspective views for explaining the detailed structure.

  Hereinafter, the configuration of a motor-driven throttle valve control device mounted on a vehicle engine will be described.

  FIG. 5 is a cross-sectional view of a motor-driven throttle valve control device used in a diesel engine vehicle according to an embodiment of the present invention.

  An intake die 1 (hereinafter referred to as a bore) and a motor housing 20A for housing the motor 20 are molded together in an aluminum die cast throttle valve assembly (hereinafter referred to as a throttle body) 6.

  A metal rotating shaft (hereinafter referred to as a throttle shaft) 500 </ b> A is disposed on the throttle body 6 along one diameter line of the bore 1. Both ends of the throttle shaft 500 </ b> A are rotatably supported by needle bearings 9 and 10. The needle bearings 9 and 10 are press-fitted and fixed to bearing boss portions 7 and 8 provided on the throttle body 6. In addition, after inserting a C-type washer (hereinafter referred to as a thrust retainer) 12 into a slit provided on the throttle shaft 500A, the needle bearing 9 is press-fitted, thereby restricting the axial movable amount of the throttle shaft 500A. .

  Thus, the throttle shaft 500A is rotatably supported with respect to the throttle body 6. A throttle valve (hereinafter referred to as a throttle valve) 2 made of a metal disc is inserted into the throttle shaft 500A and is inserted into a slit provided in the throttle shaft 500A, and is fixed to the throttle shaft 500A with screws 4 and 5. .

  Thus, when the throttle shaft 500A rotates, the throttle valve 2 rotates, and as a result, the cross-sectional area of the intake passage changes and the intake air flow rate to the engine is controlled.

  Next, description will be made with reference to FIGS. 6 to 9 together with FIG. FIG. 6 is an exploded perspective view of a gear cover of a motor-driven throttle valve control device used in a diesel engine vehicle according to an embodiment of the present invention. FIG. 7 is an external perspective view of a motor-driven throttle valve control device used in a diesel engine vehicle according to an embodiment of the present invention. FIG. 8 is a perspective view of the motor-driven throttle valve control device used in a diesel engine vehicle according to an embodiment of the present invention with the gear cover removed. FIG. 9 is an exploded view of a motor-driven throttle valve control device used in a diesel engine vehicle according to an embodiment of the present invention.

  The motor housing 20A is formed substantially in parallel with the throttle shaft 500A, and the motor 20 composed of a brush type DC motor is inserted into the motor housing 20A substantially in parallel with the throttle shaft 500A, and is placed on the side wall 6A of the throttle body 6. The flange portion of the bracket 20 </ b> B of the motor 20 is fixed by screwing with a screw 21. A wave washer 25 is disposed at the end of the motor 20 to hold the motor 20.

  The openings of the bearing boss portions 7 and 8 are sealed with needle bearings 9 and 10 so as to constitute a shaft seal portion and keep secret. Further, the end on the bearing boss 8 side is sealed with a cap 11 to prevent the end of the throttle shaft 500A and the needle bearing 10 from being exposed.

  As a result, air leakage from the bearing portion or grease for lubricating the bearing is prevented from leaking into the outside air or into a sensor chamber to be described later.

  A metal gear 22 having the smallest 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 500A are collectively arranged on the side surface of the throttle body on the side where the gear 22 is provided. These mechanisms are covered with a resin cover (hereinafter referred to as a gear cover) 26 fixed to the side surface of the throttle body 6. The so-called gear storage chamber covered with the gear cover is provided with the inductance-type non-contact rotation angle detection device (hereinafter referred to as a throttle sensor) described with reference to FIGS. 1 to 3, and the rotation angle of the throttle shaft 500A, As a result, the opening degree of the throttle valve 2 is detected. The gear cover 26 is formed integrally with the case 200A.

  The throttle gear 13 is fixed to the end of the throttle shaft 500A on the gear cover 26 side. The throttle gear 13 includes a metal plate 14 and a resin gear portion 15 formed by resin molding on the metal plate 14. A resin material gear portion 15 is molded on the metal plate 14 by resin molding.

  The metal plate 14 has a hole in the center. A thread groove is carved around the tip of the throttle shaft 500A. The tip of the throttle shaft 500A is inserted into the hole of the metal plate 14, and the nut 17 is screwed into the threaded portion to fix the metal plate 14 to the throttle shaft 500A. Thus, the metal plate 14 and the resin gear portion 15 molded there rotate integrally with the throttle shaft 500A.

  A return spring 16 formed of a string-wound spring is sandwiched between the back surface of the throttle gear 13 and the side surface of the throttle body 6.

  One side of the return spring 16 surrounds the periphery of the bearing boss 7, and its tip is engaged with a notch formed in the throttle body 6, so that the end cannot rotate in the rotational direction. The other end surrounds a cup-shaped portion 13A formed in the throttle gear 13, and its tip is locked in a hole formed in the metal plate 14, so that this end portion cannot rotate in the rotation direction. .

  Since the present embodiment relates to a throttle valve control device for a diesel engine, the initial position of the throttle valve 2, that is, the opening position where the throttle valve 2 is given as the initial position when the power of the motor 20 is cut off is fully open. Position.

  For this reason, the return spring 16 is preloaded in the rotational direction so that the throttle valve 2 maintains the fully open position when the motor 20 is not energized.

  Between the gear 22 attached to the rotating shaft of the motor 20 and the gear 15 fixed to the throttle shaft 500A, it is rotatably supported by a metal shaft 24 press-fitted and fixed to the side surface of the throttle body 6. The intermediate gear 23 is engaged. The intermediate gear 23 includes a large-diameter gear 23A that meshes with the gear 22 and a small-diameter gear 23B that meshes with the resin material gear portion 15 of the throttle gear 13. Both gears are integrally molded by resin molding. These gears 22, 23A, 23B, and 15 constitute a two-stage reduction gear mechanism.

  Thus, the rotation of the motor 20 is transmitted to the throttle shaft 500A through this reduction gear mechanism.

  These speed reduction mechanism and spring mechanism are covered with a gear cover 26 made of a resin material. A groove into which the seal member 30 is inserted is formed on the periphery of the opening end side of the gear cover 26. When the gear cover 26 is put on the throttle body 6 with the seal member 30 mounted in the groove, the seal member 30 is inserted. Is in close contact with the end face of the frame around the gear storage chamber formed on the side surface of the throttle body 6 to shield the gear storage chamber from the outside air. In this state, the gear cover 26 is fixed to the throttle body 6 with six clips 27 (see FIGS. 7 and 8).

  The rotation angle detection device, that is, the throttle sensor formed between the reduction gear mechanism configured as described above and the gear cover 26 (case 200A) covering the reduction gear mechanism will be specifically described below.

  The resin holder 19 is fixed to the end of the throttle shaft 500A on the gear cover 26 side by welding. An excitation conductor (conductor) 100D formed by pressing is attached to the flat portion of the tip of the resin holder 400A (end on the gear cover 26 side) by integral molding. That is, simultaneously with the joining of the excitation conductor 100D, the resin holder 400A is molded integrally with the excitation conductor 100D. Thus, the excitation conductor 100D is held by the resin holder 400A in a state of being fixed by the resin material forming the resin holder 400A. This eliminates the need for an assembly process for assembling the excitation conductor 100D to the resin holder 400A, thereby improving the productivity and improving the reliability of bonding between the excitation conductor 100D and the resin holder 400A.

  The excitation conductor 100D may be formed on the resin holder 400A by printing. Thereby, in addition to the improvement in productivity and reliability for the same reason as described above, the excitation conductor 100D can be made thinner and lighter. As a result, the weight of the resin holder 400A can be reduced, and the reliability of bonding between the rotating shaft 500A and the resin holder 400A can be improved.

  Therefore, when the motor 20 rotates and the throttle valve 2 rotates, the excitation conductor 100D also rotates integrally with the throttle valve 2.

  An excitation conductor 300A and a signal detection conductor 300B of the throttle sensor are fixed to the gear cover 26 at positions facing the excitation conductor 100D.

  Here, when the excitation conductor 100D is configured to be electrically connected to the throttle shaft 500A, when static electricity is applied to the connector terminal of the gear cover 26, the excitation conductor 100D or the excitation conductor 100D may be interposed between the excitation conductor 100D and the excitation conductor 100D. And the signal detection conductor 300B may discharge, and the microcomputers 300l and 300M of the throttle sensor may be destroyed.

  In this embodiment, therefore, the excitation conductor 100D and the throttle shaft 500A are electrically insulated from each other by disposing the resin holder 400A between the excitation conductor 100D and the throttle shaft 500A.

  Further, by forming the resin holder 400A integrally with the throttle shaft 3 and the excitation conductor 100D, a small and inexpensive electronically controlled throttle body can be provided.

  Here, the height of the excitation conductor 100D can be adjusted by integrating the resin holder 400A with the throttle shaft 500A after the throttle shaft 500A is assembled to the throttle body 6. As a result, small clearances between the excitation conductor 100D, the excitation conductor 300A, and the signal detection conductor 300B can be adjusted with high accuracy, and a highly accurate non-contact rotation angle detection device can be obtained.

  FIG. 10 is a plan view of a gear housing chamber of a motor-driven throttle valve control device used in a diesel engine vehicle according to an embodiment of the present invention.

  The gear housing chamber 28 is partitioned by the frame 6F to which the gear cover 26 is fixed. On the outside of the frame 6F, six attachment portions 29A to 29F for clipping the gear cover 26 with clips 27 can be seen. 6P1 to 6P3 are positioning walls for the gear cover 26. The positioning conductors of the gear cover 26 are locked to the three walls 6P1 to 6P3, so that the excitation conductor 300A and the signal detection conductor 300B are on the rotation side excitation conductor 100D. And can output a signal within a required allowable range.

  The fully open stopper 13 </ b> A mechanically determines the initial position (that is, fully open position) of the throttle gear 13, and is constituted by a protrusion integrally formed on the inner side wall of the throttle body 6. When the notch end portion of the throttle gear 13 abuts on this protrusion, the throttle shaft 500A cannot rotate beyond the fully open position.

  The fully closed stopper 13B regulates the fully closed position of the throttle shaft 500A. When the end on the opposite side of the throttle gear 13 is in the fully closed position, it collides with the fully closed stopper 13B, and the throttle shaft 500A rotates beyond the fully closed position. To stop doing.

  The maximum value of the rotation range of the excitation conductor 100D fixed to the end of the throttle shaft 500A is determined by the fully open stopper 13A and the fully closed stopper 13B.

  The output of the signal detection conductor 300B when the throttle gear 13 is at the positions of these stoppers 13B and 13A indicates the fully closed and fully opened values of the throttle valve 2. 20B indicates a motor bracket, and 20F indicates a flange portion of the motor bracket 20B.

  In this embodiment, the excitation conductor 100D is provided integrally with the resin holder 400A, and the resin holder 400A is welded to the throttle shaft 500A, thereby simplifying the configuration of these components and reducing the number of components and improving reliability. can do. Further, by adjusting the relative positional relationship between the resin holder 400A and the throttle shaft 500A, the distances between the excitation conductor 100D, the excitation conductor 300A, and the signal detection conductor 300B can be adjusted with high accuracy, and a predetermined sensor output can be obtained. Can be obtained with high accuracy.

  Further, in this embodiment, since it is not necessary to mold the resin holder 400A using the throttle shaft 500A as an insert member, no large-scale equipment is required. For this reason, it is possible to provide a non-contact type inductance type rotation detection device that is highly productive and inexpensive.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of the embodiment.

  In the present embodiment, a motor-driven throttle valve control device (motor-driven throttle valve control device) for a diesel engine vehicle is described as being equipped with an inductance-type non-contact type rotation detection device. The present invention can also be applied to a motor-driven throttle valve control apparatus.

  Furthermore, this embodiment can also be applied as a rotation angle detection sensor, for example, a sensor that detects the rotation angle of an accelerator. In addition, the present invention can also be applied to a rotation angle detection device for a turbocharger movable blade control actuator, a rotation angle detection device for a gear shift actuator of an automatic transmission, or a rotation angle detection device for a 2WD / 4WD switching actuator.

  DESCRIPTION OF SYMBOLS 1 ... Bore, 2 ... Throttle valve, 4 ... Screw, 5 ... Screw, 6 ... Throttle body, 7 ... Bearing boss part, 8 ... Bearing boss part, 9 ... Bearing, 10 ... Bearing, 11 ... Cap, 12 ... Thrust retainer , 13 ... throttle gear, 14 ... metal plate, 15 ... resin molding, 16 ... return spring, 17 ... screw, 20 ... motor, 21 ... screw, 22 ... motor gear, 23 ... intermediate gear, 24 ... gear shaft, 25 ... Wave washer, 26 ... gear cover, 27 ... clip, 30 ... seal member, 100D ... excitation conductor, 300A ... excitation conductor, 300B ... signal detection conductor, 400A ... resin holder, 500A ... throttle shaft.

Claims (6)

A rotation shaft, a resin holder fixed to the rotation shaft and provided with an excitation conductor, a case member covering the resin holder, an excitation conductor disposed at a position facing the excitation conductor and fixed to the case member side, and In a rotation angle detection device comprising a signal detection conductor,
The resin holder is joined to the rotating shaft by welding,
The rotation angle detecting device, wherein a first groove and a second groove having different angles with respect to the axial direction of the rotation shaft are formed on the outer peripheral surface of the rotation shaft. In the rotation angle detection device according to claim 1,
The first groove is formed on the outer peripheral surface of the rotating shaft along a circumferential direction perpendicular to the axial direction of the rotating shaft,
The rotation angle detecting device, wherein the second groove is formed to have an angle larger than 0 ° with respect to the first groove. In the rotation angle detection device according to claim 2,
The first groove and the second groove are made redundant so that the excitation conductor rotates in synchronism with the rotation shaft when the bonding due to welding of the rotation shaft and the resin holder loses its function. A rotation angle detecting device having a function. In the rotation angle detection device according to claim 2,
The excitation conductor is formed by pressing,
A rotation angle detection device, wherein the rotation angle detection device is held by the resin holder in a state of being fixed by a resin material forming the resin holder. In the rotation angle detection device according to claim 2,
The rotation angle detecting device, wherein the excitation conductor is formed on the resin holder by printing. In a throttle valve control device mounted on a vehicle engine,
A throttle valve control device comprising the rotation angle detection device according to any one of claims 1 to 5.

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