JP5351861B2 - Drive control device - Google Patents

Description

  The present invention is applied to a drive device that transmits the power of an electric actuator to a drive mechanism and variably controls the running state of a vehicle and the operation state of an internal combustion engine by the operation of the drive mechanism, and a drive for driving the electric actuator. The present invention relates to a control device.

  One of conventional drive control devices mounted on a vehicle is an electric booster. As this electric booster, one described in Patent Document 1 below is provided.

  This electric booster is bolted to an ECU casing that houses boards that control the drive of an electric motor, for example, an electric actuator.

JP 2009-202867 A

  For example, in the engine room where the electric motor and a control device which is an ECU for controlling the electric motor are mounted, other operating devices and various pipes are disposed around the mounting position. In order to avoid interference, the mounting space of the control device is limited. As a result, a thinner control device is desired.

  The present invention has been devised in view of the technical problem of the conventional device, and can reduce the height of the ECU casing in the vertical direction to improve the downsizing of the entire device and the freedom of layout. The object is to provide a control device.

The present invention, in particular, forms the bottom wall of the ECU casing in a substantially reverse concave shape along the shape of the arcuate outer periphery of the actuator casing,
A first housing part that is housed in the ECU casing and formed at a position facing a part of the outer peripheral surface of the actuator casing;
A second housing portion disposed at a side of the first housing portion and formed at a position facing the outer peripheral surface of the actuator casing in a circumferential direction rather than the outer peripheral surface of the actuator casing facing the first housing portion; With
A cylindrical housing wall provided on the bottom wall and constituting a part of the second housing portion extends downward from an outer peripheral surface facing the first housing portion of the actuator casing. It is characterized by.

  According to the present invention, the amount of upward protrusion of the ECU casing from the upper end of the actuator casing can be made sufficiently small, so that the overall size of the apparatus can be reduced and the degree of freedom in layout can be improved.

It is a front view which shows a part of electric booster as a drive control apparatus which concerns on this invention. It is a perspective view of the electric booster of this embodiment. It is a side view of the same electric booster. It is a top view of the same electric booster. It is a front view which decomposes | disassembles and shows the same electric booster. It is an overhead view which decomposes | disassembles and shows the same electric booster. It is a perspective view which decomposes | disassembles and shows the control mechanism with which the same electric booster is provided. It is a bottom view of the ECU casing main body provided for the electric booster.

  Hereinafter, an embodiment in which a drive control device according to the present invention is applied to an electric booster for an automobile brake system will be described in detail with reference to the drawings.

  As shown in FIGS. 1 to 4, the electric booster according to the present invention has a master cylinder (not shown) that has one end fixed to a partition wall that partitions the engine room and the passenger compartment, and a tandem cylinder at the other end. And a drive control device 2 (ECU) that is provided integrally with the upper end of the drive mechanism 1 and controls the electric actuator 3 included in the drive mechanism 1. .

  In the following, since the master cylinder and other components of the drive mechanism 1 are the same as the contents described in Patent Document 1, the structure that does not appear on the drawings will be briefly described.

  The drive mechanism 1 includes an actuator casing 4 and a rear cover 5 fixed to the rear end side (vehicle compartment side) of the actuator casing 4. A front wall 4a is integrally provided on the front end side (engine room side) of the actuator casing 4, and the master cylinder is fixed to the front wall 4a by a stud bolt. The rear cover 5 is integrally provided with a cylindrical boss portion 5a, and this boss portion 5a extends through the partition wall into the vehicle interior.

  The actuator casing 4 houses therein a piston assembly that is shared as a primary piston of the master cylinder, and the electric actuator 3 that drives a booster piston that constitutes the piston assembly.

  The master cylinder (not shown) includes a bottomed cylinder body and a reservoir, and a secondary piston that is paired with the piston assembly is slidably disposed in the cylinder body. In the cylinder body, two pressure chambers are defined by a piston assembly and a secondary, and brake fluid sealed in each pressure chamber according to the advance of both pistons is discharged from a discharge port provided in the cylinder body. It is pumped to the corresponding system wheel cylinder.

  The piston assembly is composed of the booster piston and an input piston, and a solid input piston is disposed in the cylindrical booster piston so as to be relatively movable therewith.

  A rear end portion of the input piston is rotatably connected to a front end portion of an input rod that interlocks with a brake pedal, and the input piston moves forward and backward in the booster piston by operating the brake pedal. .

  The electric actuator 3 includes an electric motor 6 that is a three-phase AC brushless motor, and a ball screw mechanism (not shown) that converts the rotation of the electric motor 6 into a linear motion and transmits it to the booster piston. Yes.

  A pair of balance springs are disposed between the booster piston and the input piston to hold the booster piston and the input piston in a neutral position relative to each other when the brake is not operated.

  A potentiometer that detects the absolute displacement of the input piston with respect to the vehicle body is provided in the vehicle interior via the movement of the input rod, and the potentiometer is a brake pedal sensor that detects the amount of depression of the brake pedal. . In the actuator casing 4, a reso lever is provided for detecting the absolute displacement of the booster piston relative to the vehicle body from the rotational displacement of the electric motor 6.

  As shown in FIGS. 1 and 5, the actuator casing 4 is formed in a relatively large-diameter cylindrical shape by an aluminum alloy material by molding or the like, and is rectangular at the uppermost end of the arc-shaped upper end 4b. A mounting table 7 which is a frame-shaped first connection portion is formed integrally. Further, support mechanisms 8 for mounting and fixing the drive control device 2 are integrally provided on both sides 4c and 4d in the circumferential direction of the upper end 4b.

  As shown in FIG. 6, the mounting table 7 is formed in a substantially rectangular plane extending along the axial direction of the actuator casing 4 and has a sufficiently low height. Further, a first opening 7a for connection such as a terminal is formed at the upper end, and a substantially elliptical shape in which motor later-described motor three-phase terminals 28a to 28c of the drive control device 2 face the front end wall on the engine room side. A second opening 7b having a shape is formed.

  The upper end surface of the peripheral wall of the first opening 7a is entirely provided with a fitting groove 7c in which a seal member (not shown) for sealing between the drive control device 2 mounted and fixed on the upper end surface is fitted and fixed. It is formed over the circumference.

  Three rectangular motor three-phase terminal blocks 38a, 38b, and 38c on which the motor three-phase terminals 28a to 28c are arranged in a superposed state are fixed inside the second opening 7b. Female screw holes are formed in the motor three-phase terminal blocks 38a to 38c, respectively.

  As shown in FIGS. 5 and 6, the support mechanism 8 is integrally formed with the actuator casing 4 by an aluminum alloy material, and rises from the both side portions 4 c and 4 d of the upper end portion 4 b outward at a predetermined angle. The left and right support beam portions 9a and 9b are connected to the actuator casing 4 and the support beam portions 9a and 9b integrally formed by being arranged along the horizontal direction at the upper ends of the support beam portions 9a and 9b. Part 10a, 10b, and four substantially cylindrical support pillars 11a, 11b, 12a, 12b which are erected integrally with the support beam parts 9a, 9b via the connection parts 10a, 10b. ing.

  Further, as shown in FIG. 1, the support mechanism 8 as a whole is offset from the central axis P of the actuator casing 4 by a predetermined amount on the left side in the drawing.

  The first to fourth support columns 11a, 11b, 12a, 12b are set to have the same length in the vertical axis direction, and are internally threaded holes into which the fixing bolts 13 are screwed in the internal axis direction of each upper end. 14 are formed.

  The pair of right and left first and second support columns 11a and 11b in FIG. 1 are arranged side by side along the central axis P of the actuator casing 4 and are located inside (center of) one side 4c of the actuator casing 4. It is arranged near the axis P).

  On the other hand, the third and fourth support columns 12a and 12b on the left side in the figure are offset in the left-right direction, and the third support column 12a on the front side in the figure sandwiches the first support column 11a and the central axis P. The fourth support column 12b is offset from the third support column 12a by a predetermined amount α while being arranged at a substantially symmetrical position.

  As shown in FIGS. 1 and 5 to 7, the drive control device 2 is accommodated in an ECU casing 15 that is fixed on the support columns 11 a to 12 b of the support mechanism 8 and the ECU casing 15. And an electronic circuit to be described later.

  The ECU casing 15 includes a bottomed ECU casing body 16 and a cover 17 that closes the upper end opening of the ECU casing body 16.

  As shown in FIG. 1, the ECU casing 15 is offset in one direction within a plane H orthogonal to the plane G including the central axis P of the actuator casing 4 based on the offset arrangement of the support mechanism 8 of the actuator casing 4. Has been placed. In relation to the vehicle, the center line O of the ECU casing 15 in the lateral direction of the ECU casing 15 and the axis P (plane G) of the motor rotor are arranged with respect to the actuator casing 4 so as to be shifted in the lateral direction of the vehicle by β. This offset amount ensures a space where the female connector can be attached to and detached from the male connector 26 described later without interfering with other devices in the engine room when the electric booster is mounted on the vehicle. The amount is set to be possible.

  The ECU casing body 16 is formed in a deformed box shape using an aluminum alloy material or the like, and one side portion side of the first and second support column portions 11a and 11b is formed in a planar U shape, but on the opposite side. The other side is formed in a substantially triangular shape. In addition, a fitting groove 16b is formed on the upper end surface of the surrounding rising outer peripheral wall 16a. A step-shaped concave groove 16c, which is a third housing portion into which a male connector 26 described later is fitted and held, is formed on the side portion.

  Further, the ECU casing body 16 has an entire bottom wall formed in a step shape, and a first bottom wall 18a formed continuously with the concave groove 16c side is formed slightly lower than the upper end surface of the outer peripheral wall 16a. That is, it is formed in a raised bottom shape, and the second bottom wall 18b on the opposite side to the concave groove 16c is formed in a deep groove shape.

  As shown in FIGS. 5 and 7, the first bottom wall 18 a is formed in a substantially rectangular shape, and the bottom surface 18 c is formed in a flat shape. Two rectangular heat radiation sheets 20a and 20b are attached to each other along the horizontal direction. On the other hand, the deep groove-like second bottom wall 18b is configured as a second housing portion 21 and has a cylindrical housing wall 18d that houses two electrolytic capacitors 31a and 31b described later.

  Further, four support pieces 16d to 16g each having a rectangular plate shape are provided along the horizontal direction at positions corresponding to the support columns 11a to 12b at the front and rear positions on one side of the ECU casing body 16 and the front and rear positions on the other side. Projected. Each of the support pieces 16d to 16g is formed with a bolt insertion hole 16h through which a bolt 22 screwed to each of the support column portions 11a to 12b of the support mechanism 8 is inserted. Further, at a predetermined position in the circumferential direction of the outer peripheral wall 16a, four small female screw holes 16i into which four fixing screws 39 for fixing the cover 17 are screwed are formed along the vertical direction.

  The cover 17 is formed of an aluminum alloy material so as to follow the shape of the outer peripheral wall 16a of the ECU casing body 16, and the upper wall portion 17b is integrally formed with the upper end of the peripheral wall 17a having a predetermined height. Is provided. Further, on the lower surface of the abutting portion 17c that protrudes in a flange shape from the outer periphery of the lower end of the peripheral wall 17a, a projection not shown that fits in the fitting groove 16b of the ECU casing body 16 is formed continuously and integrally in the circumferential direction. ing. A screw insertion hole 17d through which the fixing screw 39 is inserted is formed at four positions in the circumferential direction of the peripheral wall 17a.

And the above configuration, the ECU casing body 16, the entire lower surface is formed in an inverted concave shape along the shape of the arcuate upper portion 4 b of the actuator casing 4 the outer peripheral portion, it corresponds to the reverse recess The thin first housing portion 19 is formed at a position, and a step-like second housing portion 21 that is long in the vertical direction is formed at a position corresponding to the down side of the other end portion 4 c of the actuator casing 4.

  Therefore, when the ECU casing 15 is attached to the support mechanism 8 of the actuator casing 4, the ECU casing 15 is fixed in a sufficiently low state without projecting greatly from the uppermost end of the outer periphery of the actuator casing 4.

  A plurality of radiating fins 25 project in the vertical direction on the lower surface of the outer peripheral wall 16a excluding the first bottom wall 18a, the second bottom wall 18b, and the housing wall 18d. Further, a breathing filter 41 is attached to the rear end portion of the outer peripheral wall 16a on the second housing portion 21 side.

  The electronic circuit housed in the ECU casing 15 is a power electronic circuit for supplying power to the stator of the electric motor 6 in the actuator casing 4 and a filter electronic circuit for removing energization noise. A bus bar assembly 23 provided and a control board 24 for controlling the drive of the electric motor 6 are provided.

  The bus bar assembly 23 is integrally formed in a substantially plate shape by molding with a synthetic resin material, and the outer shape is formed in a different shape along the inner surface shape of the outer peripheral wall 16a of the ECU casing main body 16. The male connector 26 is provided integrally with the portion 23a.

  Further, on the inner bottom surface side of the bus bar assembly 23, a plurality of alternating currents for outputting a plurality of semiconductor elements which are each component of the power electronic circuit, a plurality of direct current terminals, and a direct current power are outputted. Terminal pins 27 are respectively provided.

  The male connector 26 is connected to a female connector (not shown) having one end connected to a battery power source.

  Further, on the front end side of the bus bar assembly 23, three motor three-phase terminals 28a, 28b, 28c protrude downward from the bottom surface of the first bottom wall 18a, and a resolver connector (not shown) faces the bottom surface. Yes.

  Insertion holes 30 through which the connection bolts 29a, 29b, and 29c are inserted are formed through the respective tip portions of the motor three-phase terminals 28a to 28c.

  On the other side 23b side of the bus bar assembly 23 opposite to the male connector 26, there are a relay circuit, a MOS FET, a shunt resistor, a common mold coil, a normal mode coil, etc., which are components of the filter electronic circuit. Is provided. The two electrolytic capacitors 31a and 31b are fitted and fixed to the cylindrical portion 23c formed on the lower surface of the other side portion 23b via an adhesive. A plurality of connection terminal pins 32 such as a power terminal for receiving DC power from the male connector 26 and a signal terminal for sending and receiving signals are provided on the one side portion 23a so as to protrude upward.

  In the bus bar assembly 23, insertion holes through which the four fixing screws 33 are inserted are formed at predetermined positions in the circumferential direction of the outer peripheral portion so that the bus bar assembly 23 is fixed to the ECU casing body 16 by the four fixing screws 33. It has become.

  The male connector 26 is formed in an oblong shape that is long in the lateral direction, protrudes outward from the lower surface of one side portion of the bus bar assembly 23, and is internally connected to a female terminal of the female connector. A terminal 26a is provided. Further, the upper surface of the outer peripheral wall 16a is mounted on the upper surface of the fitting projection piece 26b integrally formed on the base end portion of the male connector 26 when the ECU casing body 16 is assembled to the concave groove 16c. A second linear fitting groove 26c that coincides with the forming position of the fitting groove 16b is formed along the front-rear direction.

  The control board 24 is formed in a substantially rectangular thin plate shape by a synthetic resin material, and is formed on the upper portion of the bus bar assembly 23 by four fixing screws 34 inserted into the screw insertion holes 24a formed at the four corners. It is fixed with a predetermined gap.

  A control circuit including a computer is attached to the control board 24, and a control signal for controlling driving of an inverter (semiconductor element) that is a drive circuit of the electric motor 6 is generated by this board. A connection terminal pin 27 that is each terminal of the power electronic circuit is connected to a connection portion (a plurality of small holes) 24 b provided on one side of the control board 24 by solder, and one side of the control board 24. The connection terminal pin 32 of the male connector 26 is connected to the connection part (a plurality of holes) 24c included in the connector by soldering.

[Assembly procedure]
Hereinafter, an assembly procedure of the drive control device 2 to the actuator casing 4 will be described with reference to FIG.

  First, the predetermined components of the power electronic circuit 36 and the predetermined components of the filter electronic circuit are modularized to form the bus bar assembly 23 and the control circuit of the control board 24.

  Next, the common mold coil or the like is fixed by a welding technique such as TIG welding, and electrolytic capacitors 31a and 31b are fitted and fixed to the cylindrical portion 23c with an adhesive to the bus bar assembly 23.

  Thereafter, the bus bar assembly 23 is accommodated in the ECU casing main body 16. At this time, the power electronic circuit 36 side of the bus bar assembly 23 is placed on the upper surface of the first bottom wall 18 a of the first accommodating portion 19. The male connector 26 is fitted into the concave groove 16c while being placed via the heat dissipation sheets 20a and 20b. As a result, both ends of the fitting groove 16b of the ECU casing body 16 and the second fitting groove 26b of the male connector 26 are brought into a butted state to ensure continuity, and the bus bar assembly 23 is positioned. The ECU casing body 16 is fixed by four fixing screws 33.

  Next, the control board 24 is mounted from above the power electronic circuit side of the bus bar assembly 23 and fixed to the upper portion of the bus bar assembly 23 with four fixing screws 34 and clips through a predetermined small gap, The connection terminal pins 27 and 32 protruding from the plurality of small holes of the connection portions 24b and 24c are connected to the connection portions 24b and 24c by soldering.

  Subsequently, the cover 17 is placed on the ECU casing main body 16 while being positioned, and the protrusion on the lower surface is fitted into the fitting groove 16b and the second fitting groove 26b, and the four fixing screws 39 are used. The ECU casing main body 16 is fixed to the upper end surface of the outer peripheral wall 16a.

  Next, the unit body of the drive control device 2 is assembled to the upper end portion 4a of the actuator casing 4 in an offset state via the support mechanism 8 (see FIGS. 5 to 7).

  That is, an unillustrated seal member fitted in advance on the flat bottom surface 18e (see FIG. 8) of the first bottom wall 18a of the ECU casing body 16 on the upper surface of the rectangular frame-shaped mounting table 7 of the actuator casing 4 is provided. The four support pieces 16d to 16g of the ECU casing main body 16 are placed on the corresponding four support portions 11a to 12b on the actuator casing 4 side. Thereafter, when the bolts 13 inserted through the bolt insertion holes 16h of the support pieces 16d to 16g are screwed into the female screw holes of the support columns 11a to 12b, the assembly operation of the drive control device 2 to the actuator casing 4 is performed. Complete.

  At this time, the three motor three-phase terminals 28a to 28c of the bus bar assembly 23 are arranged in a superposed state on the front surface of the three motor terminal blocks 38a to 38c provided in the mounting table 7, so that Are screwed and connected by three bolts 35a to 35c inserted from the second opening 7b. Further, the resolver connector is connected to a resolver harness 40 (see FIG. 6) facing the first opening 7a of the mounting table 7 described above. Finally, the second opening 7b is sealed by press fitting and fixing a rubber grommet for sealing.

  As described above, according to the present embodiment, the power electronic circuit and the filter electronic circuit are formed separately from each other in the upper and lower parts as in the prior art, and are not arranged vertically with a gap therebetween. The module is modularized to form a thin bus bar assembly 23, and electrolytic capacitors 31 a and 31 b that are long in the axial direction are arranged vertically on the side of the bus bar assembly 23.

  For this reason, the ECU casing main body 16 of the drive control device 2 includes a thin first housing portion 19 (first bottom wall 18a) in which the bus bar assembly 23 is housed and a cylindrical portion in which electrolytic capacitors 31a and 31b are housed. 23c and the like are formed by the second accommodating portion 21 (second bottom wall 18b) having a large height, and the first accommodating portion 19 side is arranged on the mounting table 7 at the uppermost end of the actuator casing 4, 2 The accommodation portion 21 side is arranged in a dead space on the other side portion side of the upper end portion 4 a of the actuator casing 4. In addition, the said 1st accommodating part 19 is an area | region shown with the dashed-dotted line of FIG. 8, and the 2nd accommodating part 21 is an area | region shown with the dashed-two dotted line of FIG.

  As a result, the entire ECU casing body 16 can be formed in a reverse concave shape along the arc shape of the upper end portion 4a of the actuator casing 4, so that the ECU casing main body 16 at the upper end portion 4a of the actuator casing 4 can be vertically moved. Can be made sufficiently smaller than that of the prior art, that is, it can be made sufficiently thin. As a result, the electric booster can be miniaturized, the degree of freedom in layout in the engine room can be improved, and interference with peripheral wiper devices and air conditioner piping can be avoided.

  Further, the filter electronic circuit component can be separated from the power electronic circuit 36, and the filter electronic circuit component can be disposed on or around the radiating fin 25, so that the heat generated in the power electronic circuit is generated. It becomes difficult to be affected by heat generated by an element such as a MOS-FET. For this reason, the thermal deterioration of the filter electronic circuit component and the change of the temperature characteristic can be suppressed.

  In addition to the filter electronic circuit components other than the electrolytic capacitor 31 actuator and 31b, a relatively large component such as a relay component or a coil component can be mounted in the second accommodating portion 21.

  Since the power electronic circuit and the filter electronic circuit are integrated by the bus bar assembly 23, the manufacturing operation is facilitated and the assembly operation to the ECU casing body 16 is facilitated as compared with the conventional separate structure. Further, since the control board 24 is also a simple rectangular shape and the cover 17 is a relatively simple shape, the number of fixing steps by the fixing screws 33 and 34 can be reduced, and the fixing work can be facilitated.

  A step-shaped concave groove 16c, which is a third accommodating portion, is formed on one side of the ECU casing body 16, and the male connector 26 is fitted and held in the concave groove 16c. Since this amount can be absorbed in the height of the ECU casing body 16, the height of the ECU casing body 16 can be reduced in this respect as well. Moreover, since the male connector 26 is disposed in the dead space on the one side 4b side of the actuator casing 4, the height of the ECU casing body 16 is not affected, and the dead space can be effectively used.

  Since the male connector 26 is formed integrally with the ECU casing main body 16, the manufacturing operation is facilitated and the assembling operation is simple as compared with the case where the male connector 26 is formed separately as in the prior art. In addition, since a seal member between the ECU casing main body 16 and the male connector 26 is not necessary, the number of parts can be reduced and the cost can be reduced, and the parts can be easily managed.

  Further, in the present embodiment, since the heat radiation sheets 20a and 20b are used without filling the bottom surface of the ECU casing main body 16 with the heat radiation grease, these sticking operations are easy.

  Further, in the present embodiment, the support mechanism 8 that supports the ECU casing body 16 is composed of support beam portions 9a and 9b, connection portions 10a and 10b, and four substantially cylindrical column portions 11a, 11b, 12a, and 12b. Since it is configured, the entire drive control device 2 can be stably supported, and vibration generated by the drive mechanism 1 can be effectively absorbed by each part, so that the influence of vibration on the drive control device 2 can be suppressed, and a motor with high accuracy at all times. Control becomes possible.

  The present invention is not limited to the configuration of the above embodiment, and for example, the shape and structure of the bus bar assembly 23 can be arbitrarily changed. Moreover, it is also possible to apply to drive devices other than an electric booster.

The technical ideas of the invention other than the claims ascertained from the embodiment will be described below.
[Claim a] In the drive control apparatus according to claim 3,
The drive control apparatus according to claim 1, wherein the height of the first housing portion in the vertical direction is set to at least the height of the power circuit board and the filter circuit board.

According to the present invention, since the height of the first housing portion can be set to a size in which the thin power circuit board and the filter circuit board are overlapped, the ECU casing on the uppermost end side of the actuator casing Can be made as small as possible.
[Claim b] In the drive control apparatus according to claim 3,
A drive control device characterized in that the power board and the filter board are integrally formed of a synthetic resin material in a polymerized state to constitute a bus bar assembly.

In the present invention, since the power substrate and the filter substrate are integrally formed, it is possible to further reduce the height of the first housing portion. As a result, the height of the ECU casing on the uppermost end side of the actuator casing is further increased. Can be small.
[Claim c] In the drive control apparatus according to claim b,
A drive control device characterized in that a male connector portion is provided integrally with the bus bar assembly.

According to the present invention, by forming the bus bar assembly and the connector portion integrally, the manufacturing operation and the assembly operation can be facilitated, and the costs can be reduced.
[Claim d] In the drive control apparatus according to claim 1 or 2,
A connector comprising a communication terminal or a power supply terminal for communicating with another control device is provided, and the connector is disposed in a third groove-shaped housing portion formed on the other side of the first housing portion. A drive control device.

  According to the present invention, on the side surface of the ECU casing, it is possible to offset the center position of the connector to the bottom wall side by enlarging the opening area on the bottom wall side, thereby reducing the connector space on the ECU casing side. This makes it possible to reduce the thickness of the drive control device.

  Moreover, since a connector can be arrange | positioned in the space between an actuator casing and the bottom wall of ECU casing, the enlargement of the whole apparatus can be suppressed.

Furthermore, interference between other devices and wirings can be suppressed, and the degree of freedom of wiring layout can be improved.
[Claim e] In the drive control apparatus according to claim 2,
The drive control device according to claim 1, wherein the bottom wall is formed in a reverse concave shape from the bottom wall end in a direction orthogonal to the rotation axis of the electric actuator toward the center of the end or the second connecting portion.

DESCRIPTION OF SYMBOLS 1 ... Drive mechanism 2 ... Control mechanism 3 ... Electric actuator 4 ... Actuator casing 5 ... Rear cover 6 ... Electric motor (electric actuator)
DESCRIPTION OF SYMBOLS 7 ... Mounting stand 8 ... Support mechanism 11a-12b ... Column part 15 ... ECU casing 16 ... Casing main body 16a ... Outer peripheral wall 16c ... Concave groove (3rd accommodating part)
DESCRIPTION OF SYMBOLS 17 ... Cover 18a ... 1st bottom wall 18b ... 2nd bottom wall 18c ... Accommodating wall 19 ... 1st accommodating part 20a * 20b ... Radiation sheet 21 ... 2nd accommodating part 23 ... Busbar assembly 24 ... Control board 26 ... Male connector 25 ... Radiating fins 27, 32 ... Connection terminal pins 28a to 28c ... Motor three-phase terminals

Claims (2)

A drive control device comprising an ECU casing that is fixed to a substantially annular actuator casing of an electric actuator and contains a circuit board that outputs a drive command signal to the electric actuator,
The bottom wall of the ECU casing is formed in a substantially concave shape along the shape of the arc-shaped outer periphery of the actuator casing,
A first housing part that is housed in the ECU casing and formed at a position facing a part of the outer peripheral surface of the actuator casing;
A second housing portion disposed at a side of the first housing portion and formed at a position facing the outer peripheral surface of the actuator casing in a circumferential direction rather than the outer peripheral surface of the actuator casing facing the first housing portion; With
A cylindrical housing wall provided on the bottom wall and constituting a part of the second housing portion extends downward from an outer peripheral surface facing the first housing portion of the actuator casing. A drive control device characterized by the above. The drive control apparatus according to claim 1,
The circuit board includes at least a power circuit board on which an arithmetic processing unit that calculates a driving operation amount of the electric motor is mounted, and a filter circuit board that removes noise in a power supply path,
The drive control device, wherein the power circuit board is accommodated in the first accommodating part, and an electrolytic capacitor related to the filter circuit board is accommodated in the second accommodating part.

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