WO2012077264A1 - 電動パワーステアリング装置 - Google Patents
電動パワーステアリング装置 Download PDFInfo
- Publication number
- WO2012077264A1 WO2012077264A1 PCT/JP2011/005287 JP2011005287W WO2012077264A1 WO 2012077264 A1 WO2012077264 A1 WO 2012077264A1 JP 2011005287 W JP2011005287 W JP 2011005287W WO 2012077264 A1 WO2012077264 A1 WO 2012077264A1
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- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- electric power
- terminals
- power steering
- control unit
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0409—Electric motor acting on the steering column
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0403—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box
- B62D5/0406—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box including housing for electronic control unit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/38—Control circuits or drive circuits associated with geared commutator motors of the worm-and-wheel type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
- G01L25/003—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency for measuring torque
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
- H02K5/225—Terminal boxes or connection arrangements
Definitions
- the present invention relates to an electric power steering apparatus including a torque sensor that detects a steering torque by twisting between an input shaft and an output shaft, and a control unit that drives and controls an electric motor using a detection value of the torque sensor as control information.
- a control unit is mounted on a reduction gear box, and the control unit drives and controls the electric motor based on the information of the steering torque detected by the torque sensor, and the steering assist force generated by the electric motor is used in the steering system.
- a unit mounting surface is formed on the outer periphery of the reduction gear box, and a control unit incorporating a control board is mounted on the unit mounting surface.
- a plurality of sensor terminals connected to the internal torque sensor protrude from the unit mounting surface.
- a structure in which a plurality of sensor terminals protruding from the unit mounting surface are inserted into a plurality of through holes provided in the control board of the control unit mounted on the unit mounting surface, and are electrically connected by directly soldering the two. It is said.
- the structure in which the sensor terminal of the torque sensor and the control board of the control unit are directly connected by soldering is provided with a splash prevention cover as protection of the control unit due to short circuit of the control unit due to solder splash, thermal effects on the components, etc. It is necessary, and as the number of parts of the control unit increases, a lot of labor and time are required for assembly.
- the control board has different pattern thickness and length depending on the signal, GND line, etc., and the heat capacity of the solder connecting the sensor terminal and the control board is likely to be non-uniform, and process control is required to ensure the reliability of solder welding. May be complicated.
- An object of the present invention is to provide an electric power steering device capable of improving the reliability of a connection structure by soldering a sensor terminal of a torque sensor and a control board of a control unit.
- an electric power steering apparatus includes a steering shaft to which a steering torque is transmitted, and a steering assist force via a reduction mechanism in a reduction gear box.
- a control unit including a control board on which a control circuit for driving and controlling the electric motor is mounted, and a torque sensor built in the reduction gear box, and a plurality of protrusions protruding from the outer periphery of the reduction gear box.
- the control unit includes a sensor terminal, a plurality of through holes provided in the control board, and a plurality of connection terminals that electrically connect the plurality of sensor terminals and the plurality of through holes, and the control unit holds the control board.
- This synthetic resin frame has a plurality of connection terminals with one end connected to a plurality of through holes.
- Sensor terminal having a guide hole provided at a position facing the open end of the plurality of sensor terminals, with the other end of the plurality of connection terminals protruding outside the synthetic resin frame.
- the control unit is attached to the reduction gear box while inserting the open ends of the plurality of sensor terminals into the guide holes, and the control unit is connected to the other end of the corresponding plurality of connection terminals and the open ends of the plurality of sensor terminals.
- the portions are connected by soldering, respectively.
- the other end of the connection terminal and the open end of the sensor terminal may be connected by soldering outside the synthetic resin frame, and are accommodated in the synthetic resin frame.
- the control unit can be easily incorporated because the thermal effect due to the scattering of the solder is not exerted on the components such as the control board. Further, by performing soldering at a position away from the control board, the reliability of the sensor signal obtained from the torque sensor can be ensured.
- the open ends of the plurality of sensor terminals extend toward the rear of the vehicle, and the control unit moves toward the front of the vehicle while reducing the speed gear box. It is attached to.
- the through hole provided in the control board and the guide hole provided in the sensor terminal holding portion are provided in a direction in which the control unit is attached to the reduction gear box. It has been.
- the control unit can be easily mounted on the reduction gear box.
- the other end of the connection terminal has a plate-like land provided with a through hole, and has passed through the guide hole of the sensor terminal holding portion. With the open end of the sensor terminal passing through the through hole, the open end and the land are connected by soldering.
- the soldering operation of the other end of the connection terminal and the open end of the sensor terminal can be easily performed. Further, in the electric power steering apparatus according to one embodiment of the present invention, a constant gap is provided between the other end of the connection terminal and the opposing center terminal holding part. According to the electric power steering apparatus according to this one embodiment, since a certain gap is provided between the other end portion of the connection terminal and the center terminal holding portion, soldering with the open end portion of the sensor terminal is possible. At this time, heat at the other end of the connection terminal does not escape to the sensor terminal holding part side, and soldering can be performed efficiently.
- an electric power steering apparatus includes a deformation preventing member that prevents deformation of the other end of the connection terminal in a state where the gap is provided.
- the deformation preventing member is a leg provided on the side surface of the other end of the connection terminal, and the leg is a wall of the sensor terminal holding unit. The contact terminal is prevented from being deformed at the other end of the connection terminal.
- the center terminal holding portion is a partition wall that partitions between the other end portions of the connected connection terminals of each pair and the open end portions of the sensor terminals. Is provided. According to the electric power steering apparatus according to this one embodiment, it is possible to prevent the solder from scattering to the adjacent connection terminal and sensor terminal.
- connection terminal and the sensor terminal may be connected by soldering outside the synthetic resin frame of the control unit incorporating the control board. Can be prevented, and the reliability of the connection structure by soldering the sensor terminal of the torque sensor and the control board of the control unit can be improved. Further, since the control unit can be attached to gearboxes having different reduction ratios, the versatility of the control unit is enhanced.
- FIG. 1 is a perspective view of the electric power steering apparatus according to the first embodiment of the present invention as viewed from the driver's seat side
- FIG. 2 is a longitudinal sectional view showing a main part of the electric power steering apparatus.
- Reference numeral 1 in FIG. 1 denotes a column-type electric power steering device.
- a reduction gear box 4 is connected to a steering column 3 that rotatably houses a steering shaft 2 connected to a steering wheel (not shown).
- the reduction gear box 4 is provided with an electric motor 5 constituted by a brush motor and a control unit 19 in the direction in which the axial direction is orthogonal to the axial direction of the steering column 3.
- a lower shaft 61 is connected to the steering shaft 2 via a universal joint 60, and a pinion shaft (not shown) is connected to the other end of the lower shaft 61 via a universal joint 62.
- the steering column 3 and the reduction gear box 4 are mounted on the vehicle body side by an upper mounting bracket 6 and a lower mounting bracket 7.
- the lower mounting bracket 7 is formed by a mounting plate portion 7a and a pair of support plate portions 7b extending in parallel from the lower surface of the mounting plate portion 7a in the left-right direction at a predetermined interval. And the lower end of the support plate part 7b is rotatably connected to the support part (not shown) integrally formed in the vehicle front side of the reduction gear box 4 via the pivot 7c.
- a slit 7d is formed in the attachment plate portion 7a, and a detachment capsule 7e is fitted in the slit 7d.
- a bolt through hole 7f is formed in the release capsule 7e, and a fixing bolt (not shown) that penetrates the bolt through hole 7f from below the release capsule 7e is screwed into a vehicle body side member (not shown).
- the attachment plate portion 7a is attached to the vehicle body side member.
- the upper mounting bracket 6 is fixed to a pair of mounting plate portions 6a, a coupling plate 6a1 that couples the pair of mounting plate portions 6a, and a lower end of the pair of mounting plate portions 6a, and is separated in the left-right (vehicle width) direction.
- the tilt lever 6g of the tilt mechanism 6c is rotated to release the support state of the steering column 3, so that the tilt position of the steering column 3 can be adjusted up and down around the pivot 7c of the lower mounting bracket 7.
- a slit 6d is formed in the pair of attachment plate portions 6a, and a release capsule 6e is fitted in the slit 6d.
- a bolt through hole 6f is formed in the release capsule 6e, and a fixing bolt (not shown) that penetrates the bolt through hole 6f from below the release capsule 6e is screwed into a vehicle body side member (not shown).
- the attachment plate 6a is attached to the vehicle body side member.
- the steering shaft 2 includes an input shaft 2a whose upper end is connected to a steering wheel (not shown), and a torsion bar 2b connected to the lower end of the input shaft 2a via a torsion bar 2b. It is comprised with the output shaft 2c to cover.
- the reduction gear box 4 is formed by die-casting, for example, any one of materials having high thermal conductivity, such as aluminum, aluminum alloy, magnesium, and magnesium alloy.
- the reduction gear box 4 includes a worm storage portion 12 for storing a worm 11 of a worm reduction gear connected to an output shaft (not shown) of the electric motor 5, and a lower portion of the worm storage portion 12.
- a worm wheel storage portion 14 for storing a worm wheel 13 having a central axis perpendicular to the central axis on the side and meshing with the worm 11, and the worm wheel storage portion 14 are integrally and coaxially connected to the vehicle rear side.
- the torque sensor housing portion 16 for housing the torque sensor 15, the motor mounting portion 17 for attaching the electric motor 5 formed on the open end surface of the worm housing portion 12, the worm housing portion 12 and the worm wheel. It is formed in a plane orthogonal to the central axis of the worm wheel storage part 14 and the torque sensor storage part 16 across a part of the storage part 14.
- the torque sensor 15 magnetically detects a twisted state between the input shaft 2a and the output shaft 2c of the steering shaft 2 and transmits a steering torque transmitted to the steering shaft to a pair of detection coils 15a and 15b.
- each of the pair of detection coils 15a and 15b protrudes outward in parallel to a direction orthogonal to the central axis of the steering column 3, as shown in FIG.
- Sensor terminals 15c to 15f are connected.
- the sensor terminals 15c to 15f are bent in an L shape at the center in the longitudinal direction, and extend toward the rear of the vehicle in parallel with the central axis of the steering column 3.
- the control unit 19 mounted on the control unit mounting portion 20 of the reduction gear box 4 includes a synthetic resin frame 24, a control board 25, an inner cover 26, and an outer cover 27. And a power board (not shown) and four connection terminals 28a to 28d.
- the power board is a discrete component (not shown) such as an H bridge circuit composed of a power switching element such as a field effect transistor that drives and controls the electric motor 5 and a pulse width modulation circuit that drives the power switching element of the H bridge circuit. Has been implemented.
- the control board 25 has through holes 25a to 25d through which one end portions of the four connection terminals 28a to 28d are inserted, respectively, and one end portions of the connection terminals 28a to 28d and the through holes 25a to 25d are soldered. Connected with.
- the control board 25 is connected to the sensor terminals 15c to 15f of the torque sensor 15 via the connection terminals 28a to 28d, and is steered based on a torque detection value from the torque sensor 15 or a vehicle speed detection value from a vehicle speed sensor (not shown).
- An auxiliary current command value is calculated, and current feedback control is performed based on the steering auxiliary current command value and a detected value of the motor current output to the electric motor 5 to calculate a voltage command value to the pulse width modulation circuit of the power board.
- discrete components such as a micro control unit (MCU) for controlling the steering assist force generated by the electric motor 5 and its peripheral devices are mounted.
- MCU micro control unit
- the frame 24 is a box-shaped synthetic resin member that surrounds the power board and the control board 25, and a terminal block 24 c that is connected to the connection terminal of the electric motor 5 is provided at the left end of FIG. 3, and a female connector 45 is provided at the right end. Is provided.
- the female connector 45 includes a power connector 45a and a signal connector 45b that is connected to a network such as a CAN that exchanges data with a control device in each part of the vehicle body.
- the inner cover 26 is a synthetic resin cover.
- the outer cover 27 is a metal cover that covers the inner cover 26 and surrounds the connection positions of the sensor terminals 15c to 15f and the connection terminals 28a to 28d to block electromagnetic waves and protect interior parts.
- a sensor terminal holding portion 29 for integrally inserting and holding the sensor terminals 15c to 15f extending toward the rear of the vehicle is integrally formed on the outside of the frame 24.
- the sensor terminal holding portion 29 is formed with four tapered insertion holes 30 in which the inlet side opening 30a on the side where the sensor terminals 15c to 15f are inserted is larger than the outlet side opening 30b.
- connection terminals 28 a to 28 d One end of each of the four connection terminals 28 a to 28 d is soldered to the through holes 25 a to 25 d of the control board 25, and the other end extends toward the outlet opening 30 b side of the sensor terminal holding portion 29.
- the connection terminals 28a to 28d are partly insert-molded into the connection terminal holding portion 24a.
- the other end portions of the connection terminals 28a to 28d extend to positions facing the outlet openings 30b of the four insertion holes 30 of the sensor terminal holding portion 29, and from the four insertion holes 30 to the rear of the vehicle.
- the tip ends of the sensor terminals 15c to 15f protruding toward the end are soldered to the other ends of the connection terminals 28a to 28d.
- connection terminals 28a to 28d are disc-shaped lands 32a to 32d each having a through-hole 31 opposed to the insertion hole 30 of the sensor terminal holding portion 29 in the center thereof, and each land.
- the shape includes leg portions 33 a to 33 d extending from the outer periphery of 32 a to 32 d toward the wall 29 a of the sensor terminal holding portion 29.
- the leg portion 33c formed on the outer periphery of the land 32c abuts against the wall 29a of the sensor terminal holding portion 29 in which the insertion hole is opened.
- the gap 29 is arranged with a certain gap t between the wall 29a.
- the sensor terminal 15e and the land 32c are soldered in a state where the sensor terminal 15e protruding from the insertion hole 30 toward the rear of the vehicle passes through the through hole 31 of the land 32c.
- the lands 32a, 32b, and 32d formed at the tips of the other connection terminals 28a, 28b, and 28d also have the legs 33a, 33b, and 33d formed on the outer periphery, and the walls in which the insertion holes 30 are opened.
- the sensor terminals 15c, 15d and 15f which are arranged with a certain gap t between the wall and projecting from the insertion hole 30 toward the rear of the vehicle pass through the lands 32a, 32b and 32d.
- the holes 31 are penetrated and soldered.
- partition walls 34a to 34c for partitioning the lands 32a to 32d of the connection terminals 28a to 28d are formed to protrude from the wall in which the insertion hole 30 of the sensor terminal holding portion 29 is formed.
- the synthetic resin frame of the present invention corresponds to the frame 24
- the deformation preventing member of the present invention corresponds to the legs 33 a to 33 d
- the guide hole of the present invention corresponds to the insertion hole 30.
- a steering assist force corresponding to the steering torque of the steering wheel is generated from the electric motor 5, and this steering assist force is transmitted to the output of the steering shaft 2 via the worm 11 and the worm wheel 13, whereby the steering wheel Can be steered with a light steering force.
- the electromechanical integrated electric power steering apparatus 1 when the sensor terminals 15c to 15f of the torque sensor 15 and the through holes 25a to 25d of the control unit 19 are connected, the lands 32a to 32d of the connection terminals 28a to 28d and the sensor terminals outside the frame 24. 15c to 15f may be connected by soldering, and the control unit 19 can be easily made because the control board 25 accommodated in the frame 24 and the power board and other components are prevented from being scattered and not affected by heat. Although it is incorporated in the solder, it is possible to prevent a short circuit due to scattering of solder.
- partition walls 34a to 34c are provided between the connected assembled lands 32a to 32d and the sensor terminals 15c to 15f, it is possible to prevent the solder from scattering to adjacent land and sensor terminal connection portions. Can do.
- soldering connection between the lands 32a to 32d of the connection terminals 28a to 28d spaced apart from the control board 25 and the sensor terminals 15c to 15f can be prevented, the thermal effect due to the soldering can be prevented. The reliability of the sensor signal obtained from 15 can be ensured.
- the control unit 19 can be smoothly mounted on the control unit mounting portion 20 of the reduction gear box 4, and the lands 32a to 32d and the sensor terminals 15c to 15f can be mounted. Can be easily performed.
- the lands 32a to 32d of the connection terminals 28a to 28d are provided with a certain clearance t between the walls where the insertion holes 30 of the sensor terminal holding portion 29 are opened, the lands 32a to 32d are connected to the sensor terminals 15c to 15f.
- soldering the heat of the lands 32a to 32d does not escape to the sensor terminal holding portion 29 side, and soldering can be performed efficiently.
- leg portions 33a to 33d integrally provided on the lateral sides of the lands 32a to 32d are in contact with the wall of the sensor terminal holding portion 29, the lands 32a to 32d are excessively pressed by the soldering operation to connect the connection terminals 28a. Since the leg portions 33a to 33d are stretched, the connecting terminals 28a to 28d are slightly deformed in the direction in which the leg portions 33a to 33d are not provided. Therefore, the elastic deformation range of the connection terminals 28a to 28d can be accommodated. Since the leg portions 33a to 33d set the reference positions of the lands 32a to 32d, the connection work of the connection terminals 28a to 28d and the sensor terminals 15c to 15f automated by a machine can be performed.
- FIG. 7 what is shown in FIG. 7 is a control unit 19 according to another embodiment of the present invention.
- symbol is attached
- a cartridge 35 in which a sensor terminal holding portion 29 for inserting and holding sensor terminals 15c to 15f and a connection terminal holding portion 24a for holding connection terminals 28a to 28d are integrated in the frame 24. It is arranged detachably.
- the height is different.
- the sensor terminal holding portion 29 capable of holding the sensor terminals 15c to 15f in accordance with the specifications described above, and the sensor Since it can be changed to the cartridge 35 having the connection terminal holding portion 24a for holding the connection terminals 28a to 28d that can correspond to the terminals 15c to 15f, the versatility of the electric power steering apparatus 1 can be improved.
- each of the connection terminals 28a to 28d is insert-molded into the divided portion soldered to the through holes 25a to 25d of the control board 25 and the connection terminal holding portion 24a of the cartridge 35 so as to be exposed to the sensor terminal holding portion 29.
- the detachability of the cartridge 35 with respect to the frame 24 may be further improved as a two-divided structure including a divided part extending toward the opening 30b.
- the connection terminals 28a to 28d can be prevented from being deformed.
- the brush motor was applied as the electric motor 5
- FET field effect transistor
- the present invention is not limited to this, and when applied to a left-hand drive vehicle, the reduction gear box 4 and the electric motor 5 are used.
- the control unit 19 may be disposed on the right side of the plane symmetric with respect to the vertical plane passing through the central axis of the steering column 3.
- the electric power steering apparatus can easily incorporate the control unit by preventing the trouble due to the scattering of the solder to the control board, and the sensor terminal of the torque sensor and the control board of the control unit. This is useful for improving the reliability of the connection structure by soldering.
- SYMBOLS 1 Electric power steering device, 2 ... Steering shaft, 2a ... Input shaft, 2b ... Torsion bar, 2c ... Output shaft, 3 ... Steering column, 4 ... Reduction gear box, 5 ... Electric motor, 6 ... Upper mounting bracket, 7 ... Lower mounting bracket, 11 ... Worm, 12 ... Worm storage, 13 ... Worm wheel, 14 ... Worm wheel storage, 15 ... Torque sensor, 15a, 15b ... Detection coil, 15c to 15f ... Sensor terminal, 16 ... Torque sensor Storage portion, 17 ... Motor mounting portion, 19 ... Control unit, 20 ... Control unit mounting portion, 24 ... Frame, 24a ... Connection terminal holding portion, 24c ...
- Terminal block 25 ... Control board, 25a to 25d ... Through hole, 26 ... inner cover, 27 ... outer cover, 28a to 28d ... connection terminal, 29 ... Sensor terminal holding part, 29a ... wall, 30 ... insertion hole, 30a ... inlet opening, 30b ... exit opening, 31 ... through hole, 32a to 32d ... land, 33a to 33d ... leg part, 34a to 34c ... Partition wall, 35 ... cartridge, 45 ... female connector, 45a ... power connector, 45b ... signal connector, 60 ... universal joint, 61 ... lower shaft, 62 ... universal joint, t ... gap
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Power Steering Mechanism (AREA)
- Motor Or Generator Frames (AREA)
Abstract
Description
また、制御基板は信号、GNDライン等でパターンの太さや長さが異なり、センサ端子と制御基板を接続する半田の熱容量が不均一となりやすく、半田溶着の信頼性を確保するために工程管理が複雑となるおそれがある。
また、本発明の一の実施形態に係る電動パワーステアリング装置は、制御基板に設けたスルーホールと、センサ端子保持部に設けたガイド穴は、制御ユニットが減速ギヤボックスに装着される方向に設けられている。
また、本発明の一の実施形態に係る電動パワーステアリング装置は、接続端子の他端部は、貫通穴を設けた板形状のランドを有する形状とし、センサ端子保持部のガイド穴を通過した前記センサ端子の開放端部が貫通穴を貫通した状態で、開放端部及びランドが半田付けで接続される。
また、本発明の一の実施形態に係る電動パワーステアリング装置は、接続端子の他端部は、対向しているセンタ端子保持部との間に一定の隙間を設けている。
この一の実施形態に係る電動パワーステアリング装置によると、接続端子の他端部とセンタ端子保持部との間に一定の隙間を設けていることから、センサ端子の開放端部との半田付けの際に、接続端子の他端部の熱がセンサ端子保持部側に逃げず、効率的に半田付けを行なうことができる。
また、本発明の一の実施形態に係る電動パワーステアリング装置は、変形防止部材が、接続端子の他端部の側面部に設けた脚部であり、当該脚部が、センサ端子保持部の壁に当接することで接続端子の他端部の変形が防止される。
さらに、本発明の一の実施形態に係る電動パワーステアリング装置は、センタ端子保持部は、接続している各対の接続端子の他端部及びセンサ端子の前記開放端部の間を仕切る仕切り壁を設けている。
この一の実施形態に係る電動パワーステアリング装置によると、隣接する接続端子及びセンサ端子への半田の飛散を防止することができる。
図1は、本発明に係る第1実施形態の電動パワーステアリング装置を運転席側から見た斜視図であり、図2は、電動パワーステアリング装置の要部を示す縦断面図である。
図1の符号1はコラム型の電動パワーステアリング装置であり、ステアリングホイール(図示せず)に連結されたステアリングシャフト2を回転自在に内装するステアリングコラム3に、減速ギヤボックス4が連結され、この減速ギヤボックス4に、軸方向がステアリングコラム3の軸方向と直交する方向にブラシモータで構成される電動モータ5と制御ユニット19が配設されている。
ステアリングコラム3及び減速ギヤボックス4は、アッパ取付けブラケット6及びロア取付けブラケット7によって車体側に取付けられている。
減速ギヤボックス4は、高熱伝導性を有する材料例えばアルミニウム、アルミニウム合金、マグネシウム及びマグネシウム合金の何れか1つを例えばダイキャスト成型することにより形成されている。
パワー基板は、電動モータ5を駆動制御する電界効果トランジスタ等のパワースイッチング素子で構成されるHブリッジ回路やこのHブリッジ回路のパワースイッチング素子を駆動するパルス幅変調回路等のディスクリート部品(不図示)が実装されている。
アウターカバー27は、インナーカバー26を覆い、センサ端子15c~15fと接続端子28a~28dとの接続位置を囲っている、電磁波の遮断、内装部品の保護を行なう金属製カバーである。
ここで、図4に示すように、フレーム24の外側には、車両後方に向けて延在したセンサ端子15c~15fをそれぞれ挿通保持するセンサ端子保持部29が一体に形成されている。
センサ端子保持部29は、センサ端子15c~15fを挿入する側の入側開口部30aを出側開口部30bより大きな開口部としたテーパ形状の4箇所の挿通穴30が形成されている。
ここで、本発明の合成樹脂製フレームがフレーム24に対応し、本発明の変形防止部材が脚部33a~33dに対応し、本発明のガイド穴が挿通穴30に対応している。
車両の図示しないイグニッションスイッチをオン状態としてパワー基板及び制御基板25にバッテリから電力を供給すると、マイクロコントロールユニット(MCU)によって操舵補助制御処理が実行されて、トルクセンサ15及び図示しない車速センサの検出値に基づいて操舵補助電流指令値が算出される。この操舵補助電流指令値とモータ電流検出部で検出したモータ電流とに基づいて電流フィードバック処理を実行して、電圧指令値を算出する。この電圧指令値をパワー基板のゲート駆動回路に供給してHブリッジ回路を制御することにより、電動モータ5にモータ駆動電流が流れて電動モータ5を正転又は逆転方向に必要とする操舵補助力を発生するように駆動する。
本実施形態において、トルクセンサ15のセンサ端子15c~15fと制御ユニット19のスルーホール25a~25dとを接続する際には、フレーム24の外側で接続端子28a~28dのランド32a~32dとセンサ端子15c~15fを半田付けで接続すればよく、フレーム24内に収容した制御基板25、パワー基板等の構成部品に対する半田の飛散の防止及び半田付けによる熱影響を与えないので、制御ユニット19を容易に組み込みながらも、半田の飛散による短絡を防止することができる。
また、制御基板25から離間した接続端子28a~28dのランド32a~32dとセンサ端子15c~15fとの半田付けの接続とすることで、半田付けによる熱影響を防止することができるので、トルクセンサ15から得られるセンサ信号の信頼性を確保することができる。
本実施形態の制御ユニット19は、センサ端子15c~15fを挿通保持するセンサ端子保持部29と、接続端子28a~28dを保持する接続端子保持部24aとを一体化したカートリッジ35が、フレーム24に着脱自在に配置されている。
さらに、各ランド32a~32dに対して複数の脚部設けると、接続端子28a~28dの変形を防止することができる
Claims (8)
- 操舵トルクが伝達されるステアリングシャフトと、
このステアリングシャフトに減速ギヤボックス内の減速機構を介して操舵補助力を伝達する電動モータと、
この電動モータを駆動制御する制御回路を実装した制御基板を含む制御ユニットと、
前記減速ギヤボックスに内装されたトルクセンサに接続され、前記減速ギヤボックスの外周から突出した複数のセンサ端子と、
前記制御基板に設けた複数のスルーホールと、
前記複数のセンサ端子と複数のスルーホールとを電気的に接続する複数の接続端子と、を備え、
前記制御ユニットは、前記制御基板を保持する合成樹脂製フレームを備え、
この合成樹脂製フレームは、一端部が前記複数のスルーホールに接続した前記複数の接続端子の一部をインサートモールドし、該複数の接続端子の他端部を前記合成樹脂製フレームの外部に突出させているとともに、前記複数のセンサ端子の開放端部に対向する位置にガイド穴を設けたセンサ端子保持部を有し、
前記制御ユニットは、前記ガイド穴に前記複数のセンサ端子の開放端部を挿通しながら前記減速ギヤボックスに装着され、対応する前記複数の接続端子の他端部及び前記複数のセンサ端子の開放端部を夫々半田付けにより接続してなることを特徴とする電動パワーステアリング装置。 - 前記複数のセンサ端子の開放端部は車両後方に向けて延在しており、前記制御ユニットは、車両前方に移動しながら前記減速ギヤボックスに装着されることを特徴とする請求項1記載の電動パワーステアリング装置。
- 前記制御基板に設けた前記スルーホールと、前記センサ端子保持部に設けた前記ガイド穴は、前記制御ユニットが前記減速ギヤボックスに装着される方向に設けられていることを特徴とする請求項1記載の電動パワーステアリング装置。
- 前記接続端子の他端部は、貫通穴を設けた板形状のランドを有する形状とし、前記センサ端子保持部の前記ガイド穴を通過した前記センサ端子の前記開放端部が前記貫通穴を貫通した状態で、前記開放端部及び前記ランドが半田付けで接続されることを特徴とする請求項1記載の電動パワーステアリング装置。
- 前記接続端子の他端部は、対向している前記センタ端子保持部との間に一定の隙間を設けていることを特徴とする請求項1記載の電動パワーステアリング装置。
- 前記隙間を設けた状態で前記接続端子の他端部の変形を防止する変形防止部材を備えていることを特徴とする請求項5記載の電動パワーステアリング装置。
- 前記変形防止部材は、前記接続端子の他端部の側面部に設けた脚部であり、当該脚部が、センサ端子保持部の壁に当接することで前記接続端子の他端部の変形が防止されることを特徴とする請求項6記載の電動パワーステアリング装置。
- 前記センタ端子保持部は、接続している各対の前記接続端子の他端部及び前記センサ端子の前記開放端部の間を仕切る仕切り壁を設けていることを特徴とする請求項1記載の電動パワーステアリング装置。
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EP11770994.9A EP2574521B1 (en) | 2010-12-07 | 2011-09-20 | Electric power steering device |
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EP2574521A1 (en) | 2013-04-03 |
JPWO2012077264A1 (ja) | 2014-05-19 |
JP2012136214A (ja) | 2012-07-19 |
US20130299269A1 (en) | 2013-11-14 |
CN102666254B (zh) | 2014-09-10 |
JP5472316B2 (ja) | 2014-04-16 |
CN102666254A (zh) | 2012-09-12 |
EP2574521B1 (en) | 2016-11-16 |
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US8919489B2 (en) | 2014-12-30 |
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