CN101351377B - Electric power steering device - Google Patents

Abstract

To provide an electric power steering apparatus in which it is possible to reduce a size of the entire structure of a control unit while sufficiently showing a heat radiation effect of heat generating members. The electric power steering apparatus includes a steering column 3 having inserted therein a steering shaft 2 to which steering torque is transmitted, a reduction gear box 4 coupled to the steering shaft 2, and an electric motor 5 that transmits a steering assisting force to the steering shaft 2 via a reduction mechanism in the reduction gear box. In the reduction gear box 4, a motor mounting section 17 for mounting the electric motor 5 is formed at an end face in a direction perpendicular to an axis of the steering shaft 2 and a control-unit mounting section 20 for mounting a control unit 19 for controlling to drive the electric motor 5 is formed near the motor mounting section 17.

Description

Electric power-assisted steering apparatus

Technical field

The present invention relates to electric power-assisted steering apparatus, this electric power-assisted steering apparatus has: Steering gear, be equipped with in this Steering gear and transmitted the steering shaft of handling torque; And electro-motor, this electro-motor passes to described steering shaft via the speed reduction gearing in the reducing gearbox with steering auxiliary force.

Background technology

As existing electric power-assisted steering apparatus, for example propose to have following electric power-assisted steering apparatus: hold or assemble the tooth bar case of rack shaft or the part of steering box is held motor in freely the mode of sliding being used for, be used to hold the shell that described motor is carried out the control basal plate of drive controlling and be formed at tooth bar case or steering box, when the control basal plate of inserting from opening be formed at shell during with the installation base opposed bottom of described opening (boss) butt, be arranged at the substrate splicing ear of control basal plate and give prominence to the motor-side splicing ear that is arranged on the shell from motor and be in contact with one another and be electrically connected (reference example such as TOHKEMY 2005-329866 communique (below be called patent documentation 1), TOHKEMY 2005-329867 communique (below be called patent documentation 2), TOHKEMY 2005-329868 communique (below be called patent documentation 3) and TOHKEMY 2005-329869 communique (below be called patent documentation 4)).

At this, on control basal plate, CPU is installed in face side, side is equipped with cond, power relay etc. overleaf, and gives prominence to the supporting substrates that is provided with as radiator on control basal plate, and FET (field effect transister) is installed on this supporting substrates.

And, be used for from the outstanding abreast upper cover that forms at shell of input shaft of the adaptor union and the steering box of outside supply capability or input/output signal, in order to avoid near collision steering box such as slungshot, this adaptor union constitutes and carries out adaptor union from the top and connect.

On the other hand, as existing column type electric power-assisted steering apparatus, for example proposing has the electric power-assisted steering apparatus with following formation: via torsion bar input shaft is connected with output shaft, is equipped with in the enclosure: Worm gear mechanism, this Worm gear mechanism transmit the rotational force of electro-motor to output shaft; Magnetic Sensor, this magnetic sensor configuration are used for detecting the manipulation torque on the Steering gear side position of this Worm gear mechanism; And switching transistor, this switching transistor is arranged on the outer circumferential side of this Magnetic Sensor, is equipped with control basal plate (reference example such as TOHKEMY 2004-106703 communique (below be called patent documentation 5) covering of the Magnetic Sensor side open end that is used for closure).

But, in above-mentioned patent documentation 1～4 described conventional example, owing on 1 control basal plate, dispose CPU, FET, cond, power relay etc., so mixing, the CPU that heat generating components such as FET or cond and fearness temperature rise etc. carries, therefore the shell that holds control basal plate maximizes, and the thermal capacitance that heat generating components produces easily is full of in the shell that holds control basal plate, in addition, though FET is installed on the supporting substrates as radiator, but, can not bring into play this unsolved problem of sufficient radiating effect so exist because the caloic (heatmass) of supporting substrates self is little.

And, in above-mentioned patent documentation 1～4 described conventional example, electric power-assisted steering apparatus has following structure: be formed with between the motor shell of tooth bar case and steering box and be used to hold the shell that motor is carried out the control basal plate of drive controlling, so must will be used for being configured in the top of close steering box from the adaptor union of outside supply capability or input/output signal, water droplet or dust are invaded at connector position easily, and because adaptor union is positioned near the position of steering box, therefore adaptor union bonded assembly direction is determined by unique, and has the so unsolved problem of adaptor union bonded assembly operation difference.

In addition, in above-mentioned patent documentation 5 described conventional examples, in shell and lid, dispose Worm gear mechanism, Magnetic Sensor, control basal plate successively, so the axial length of shell and lid is elongated, and control basal plate is positioned at the position near Steering gear, therefore there is following unsolved problem: for the crumple stroke of Steering gear being guaranteed be scheduled to (collapse stroke), need to increase electric power-assisted steering apparatus single-piece length, and, can not guarantee the crumple stroke of being scheduled in order to realize the miniaturization of electric power-assisted steering apparatus.

Summary of the invention

Therefore, the present invention finishes in view of the unsolved problem of above-mentioned conventional example, and its first purpose is, a kind of electric power-assisted steering apparatus is provided, this electric power-assisted steering apparatus can be given full play to the radiating effect of heat generating components, simultaneously, and can be with the integral structure miniaturization of control unit.

And, second purpose of the present invention is, a kind of electric power-assisted steering apparatus is provided, this electric power-assisted steering apparatus is the electric power-assisted steering apparatus of cylindricality, carrying out adaptor union easily connects, can prevent the intrusion of water droplet or dust, the degree of freedom height of adaptor union bonded assembly closure, and adaptor union can not be subjected to the heat-producing influence of motor yet.

In addition, the 3rd purpose of the present invention is, provides a kind of and can guarantee the crumple stroke be scheduled to and small-sized electric power-assisted steering apparatus.

In order to reach above-mentioned the 1st purpose, the electric power-assisted steering apparatus that first aspect relates to possesses: dress is transmitted the steering shaft of handling torque in the Steering gear, this Steering gear; Reducing gearbox, this reducing gearbox and this Steering gear link; And electro-motor, this electro-motor passes to described steering shaft via the speed reduction gearing in this reducing gearbox with steering auxiliary force, it is characterized in that, in the described reducing gearbox, in the motor department of assembly of the end face that is formed at the direction of intersecting, be equipped with described electro-motor with described steering shaft, and, in the control unit department of assembly that is formed near the outside face of this motor department of assembly, be equipped with the control unit that this electro-motor is carried out drive controlling.

In first aspect present invention, owing to be equipped with electro-motor being formed in the motor department of assembly of reducing gearbox, and on being formed at, be equipped with control unit, so the heat that produces in the control unit can be rejected heat to the big reducing gearbox of caloic near the control unit department of assembly on the outside face of motor department of assembly.

And, in order to reach first purpose, the electric power-assisted steering apparatus that second aspect relates to forms, in first aspect present invention, it is characterized in that, described control unit comprises at least: control basal plate is equipped with the command value operational part that the drive command value of described electro-motor is carried out computing on this control basal plate; And power module substrate, on this power module substrate power model is installed, described power model basis comes described electro-motor is carried out drive controlling and follows heating from the drive command value of described command value operational part, and described power module substrate directly is assemblied in the control unit department of assembly of described reducing gearbox.

In second aspect present invention, by will being equipped with in the control unit department of assembly that the power module substrate of following heat-producing power model directly is assembled to reducing gearbox, thereby can further improve radiating effect.

And, in order to reach above-mentioned first purpose, the electric power-assisted steering apparatus that the third aspect relates to forms, in first aspect present invention, it is characterized in that, described control unit comprises at least: control basal plate is equipped with the command value operational part that the drive command value of described electro-motor is carried out computing on this control basal plate; And power module substrate, on this power module substrate power model is installed, described power model basis comes described electro-motor is carried out drive controlling and follows heating from the drive command value of described command value operational part, and described power module substrate is assemblied in the control unit department of assembly of described reducing gearbox across high heat conduction board.

In third aspect present invention, by will being equipped with across high heat conduction board in the control unit department of assembly that the power module substrate of following heat-producing power model is assembled to reducing gearbox, thereby heating can be rejected heat to the big reducing gearbox of caloic via high heat conduction board.

In addition, in order to reach above-mentioned first purpose, the electric power-assisted steering apparatus that fourth aspect relates to forms, and in the either side of first aspect present invention～third aspect, it is characterized in that, described reducing gearbox is made of high conductivity material.

In fourth aspect present invention relates to,,, can improve radiating effect so can increase heat absorption capacity because reducing gearbox is made of high conductivity material.

In addition, in order to reach above-mentioned first purpose, the electric power-assisted steering apparatus that the 5th aspect relates to forms, in fourth aspect present invention, it is characterized in that described reducing gearbox constitutes by in aluminium, aluminum alloy, magnesium and the magnesium alloy any carried out die cast.

In fifth aspect present invention, can when keeping high-termal conductivity, easily make reducing gearbox.

And, in order to reach above-mentioned first purpose, the electric power-assisted steering apparatus that the 6th aspect relates to forms, in the either side aspect first aspect present invention～5th, it is characterized in that, described control unit possesses: synthetic resin system framework, and this synthetic resin system framework centers on the power module substrate that directly is assembled on the described reducing gearbox, and keeps predetermined space ground to keep described control basal plate with respect to this power module substrate; And lid, described lid covers this synthetic resin system framework, and described lid is installed in the control unit department of assembly of described reducing gearbox.

In sixth aspect present invention,,, can bring into play effectiveness by adopting conductive material to constitute lid because lid is installed in the control unit department of assembly of reducing gearbox.

And, in order to reach above-mentioned first purpose, the electric power-assisted steering apparatus that the 7th aspect relates to forms, in the either side aspect second aspect present invention～6th, it is characterized in that, in the described control basal plate, large components such as relay, cond are configured in upper side, thereby effectively utilize the upper side idle space of the control unit department of assembly in the described reducing gearbox.

In seventh aspect present invention, in the upper side idle space that large component is configured in the control unit department of assembly, thereby can reduce idle space, with control unit self miniaturization as far as possible.

In addition, in order to reach above-mentioned first purpose, the electric power-assisted steering apparatus that eight aspect relates to forms, in the either side aspect first aspect present invention～7th, it is characterized in that, described reducing gearbox has at least: the worm screw that links with the output shaft of described electro-motor is taken in worm screw incorporating section, this worm screw incorporating section; The worm gear that links with described steering shaft is taken in worm gear incorporating section, this worm gear incorporating section; And torque sensor incorporating section, this torque sensor incorporating section is connected with this worm gear incorporating section, take in described torque sensor, and link with Steering gear, the control unit department of assembly that is used to assemble described control unit is formed on the peripheral part of described worm screw incorporating section, worm gear incorporating section and torque sensor incorporating section.

In eighth aspect present invention, because the control unit department of assembly is formed at the peripheral part of worm screw incorporating section, worm gear incorporating section and torque sensor incorporating section, so can make control unit near electro-motor and torque sensor, can easily carry out being electrically connected of control unit and electro-motor and torque sensor.

And, in order to reach above-mentioned second purpose, the electric power-assisted steering apparatus that the 9th aspect relates to forms, in the either side of first aspect present invention～eight aspect, it is characterized in that, described electro-motor is provided in a side of the vehicle interior side and the vehicle outside of described control unit, is provided in the opposing party of the vehicle interior side and the vehicle outside of described control unit with the outside adaptor union bonded assembly adaptor union that continues that continues.

In ninth aspect present invention, because the adaptor union that will continue is configured in the vehicle interior side or the vehicle outside of control unit, thus the continue degree of freedom of closure of adaptor union of outside can be increased, in addition, carry out adaptor union easily and connect, can not be subjected to the heat-producing influence of electro-motor in the adaptor union side.

And in order to reach above-mentioned second purpose, the electric power-assisted steering apparatus that the tenth aspect relates to forms, and in ninth aspect present invention, it is characterized in that, the continue closure of adaptor union of described continue adaptor union and described outside is set at vehicle-width direction.

In tenth aspect present invention,, invade so can prevent water droplet or dust because the closure of continue adaptor union and the outside adaptor union that continues is set at vehicle-width direction.

In addition, in order to reach above-mentioned second purpose, the tenth electric power-assisted steering apparatus that relates in one aspect to forms, aspect ninth aspect present invention or the tenth in, it is characterized in that the described adaptor union that continues is made of power connector that adjoins each other and signal connector.

In the present invention the tenth on the one hand, owing to the adaptor union that continues is made of power connector and signal connector, so power-supply system and signal system can be connected on the control unit jointly from same direction.

In addition, in order to reach above-mentioned second purpose, the electric power-assisted steering apparatus that the 12 aspect relates to forms, in ninth aspect present invention～tenth either side on the one hand, it is characterized in that, electro-motor is equipped on the vehicle interior side of described control unit, and the described adaptor union that continues is equipped on the vehicle outside of this control unit.

In aspect the present invention the 12, because the adaptor union that continues is positioned at the vehicle outside of control unit, so can shorten the distance that is connected with earth point.

And, in order to reach above-mentioned second purpose, the electric power-assisted steering apparatus that the 13 aspect relates to forms, in the either side aspect ninth aspect present invention～12, it is characterized in that described electro-motor and described control unit directly are electrically connected by splicing ear and terminal base.

In aspect the present invention the 13, because electro-motor and control unit directly be electrically connected by splicing ear and terminal base, so being electrically connected between electro-motor and the control unit need not can connect with shortest distance via the motor wire harness.

And, in order to reach above-mentioned the 3rd purpose, the electric power-assisted steering apparatus that the 14 aspect relates to forms, in the either side aspect first aspect present invention～13, it is characterized in that the position that the moving-member when described control unit is provided in not crumple stroke with the Steering gear of described reducing gearbox interferes.

In aspect the present invention the 14, because the position that the moving-member when control unit is provided in not crumple stroke with reducing gearbox interferes, so can guarantee the predetermined crumple stroke of Steering gear, and can when crumple, obtain stable amount of energy according to setting value.

In addition, in order to reach above-mentioned the 3rd purpose, the electric power-assisted steering apparatus that the 15 aspect relates to forms, in aspect the present invention the 14, it is characterized in that, described reducing gearbox has at least: the worm screw that links with the output shaft of described electro-motor is taken in worm screw incorporating section, this worm screw incorporating section; The worm gear that links with described steering shaft is taken in worm gear incorporating section, this worm gear incorporating section; And torque sensor incorporating section, this torque sensor incorporating section is connected with this worm gear incorporating section, take in described torque sensor, and link with Steering gear, the control unit department of assembly that is used to assemble described control unit is formed on the peripheral part of described worm screw incorporating section, worm gear incorporating section and torque sensor incorporating section, the contraction backstop of the Steering gear with the front end of described torque sensor incorporating section during as crumple, the contraction backstop side end face set positions that is assemblied in the control unit in the described control unit department of assembly becomes than shrinking backstop near worm gear incorporating section side.

In aspect the present invention the 15, because the contraction backstop of the Steering gear with the front end of torque sensor incorporating section during as crumple, the contraction backstop side end face set positions that is assemblied in control unit in the control unit department of assembly becomes than shrinking backstop near worm gear incorporating section side, so the interference of moving body such as Steering gear and control unit can prevent crumple reliably the time.

According to the present invention, by control unit is assemblied on the reducing gearbox, the power model that becomes heat generating part that constitutes control unit is installed on the power module substrate, other control elements are installed on the control basal plate, thereby can prevent that the heating on the power module substrate is directly delivered to control basal plate, and, because power module substrate is directly installed in the control unit department of assembly of reducing gearbox, so reducing gearbox becomes caloic, can obtain following effect: the radiating effect that can improve the heat that produces on the power module substrate.

And control unit possesses: synthetic resin system framework, and this synthetic resin system framework centers on the power module substrate that directly is assemblied on the described reducing gearbox, and keeps predetermined space ground to keep described control basal plate with respect to this power module substrate; And lid, described lid covers this synthetic resin system framework, in the control unit department of assembly that lid is installed to described reducing gearbox, thereby can be with lid as electromagnetic shield, can obtain following effect: the electromagnetic noise that HF switch produced that can prevent on-off element leaks into exterior situation, and this on-off element is used to constitute the motor drive circuit that is installed on the power module substrate.

And, because in control basal plate, large components such as relay, cond are configured to upper side, effectively utilize the upper side idle space of the control unit department of assembly in the described reducing gearbox, thereby can obtain following effect: can be with the control unit miniaturization, and can prevent the control element of such as the warming-up effect of cond etc. to lower side.

In addition, according to the present invention, because control unit is set on the reducing gearbox, on a side in the vehicle interior side of this control unit and the outside, electro-motor is installed, the outside adaptor union that continues is installed on the opposing party in the vehicle interior side of control unit and the outside, so can obtain following effect: can prevent the intrusion of water droplet or dust, and can increase the continue degree of freedom of closure of adaptor union of outside, in addition, carry out adaptor union easily and connect, can not be subjected to the heat-producing influence of electro-motor in the adaptor union side.

In addition, in common vehicle, owing on the position, the left and right sides of close the car chamber of engine room, earth point is set, so by power connector being set to outside the vehicle body, thereby can shorten the distance that is connected with earth point.

And, according to the present invention, because control unit is provided in not the position that the moving-member can be with the crumple stroke of the Steering gear of reducing gearbox the time interferes, so can guarantee the predetermined crumple stroke of Steering gear, and can when crumple, obtain stable amount of energy according to setting value.

In addition, by the top configuration control unit of the torque sensor incorporating section in reducing gearbox, thus the effect that can obtain to shorten reducing gearbox single-piece axial length, realize miniaturization.

Description of drawings

Fig. 1 is the block diagram that an embodiment of electric power-assisted steering apparatus of the present invention is shown.

Fig. 2 is the front view of electric power-assisted steering apparatus of the present invention.

Fig. 3 is the left side view of Fig. 2.

Fig. 4 is the birds-eye view of Fig. 2.

Fig. 5 is an exploded perspective view of wanting portion of the present invention.

Fig. 6 is the exploded perspective view of seeing from the direction opposite with Fig. 5 of wanting portion of the present invention.

Fig. 7 is the longitudinal sectional view shown in portion's amplification of wanting with the reducing gearbox position.

Fig. 8 is the front view that the bus structure of electro-motor is shown.

Fig. 9 is the block diagram that the relation of reducing gearbox and control basal plate is shown.

Figure 10 is the block diagram that the state on the control basal plate that the external connection terminals of the torque sensor in the reducing gearbox is extended through is shown.

Figure 11 is the block diagram shown in portion's amplification of wanting with the annexation of expression electro-motor and control unit.

Figure 12 is the block diagram of the electric power-assisted steering apparatus when crumple is shown.

The left side view of the electric power-assisted steering apparatus when Figure 13 is crumple.

The birds-eye view of the electric power-assisted steering apparatus when Figure 14 is crumple.

Figure 15 is the block diagram of variation that the bus of electro-motor is shown.

The specific embodiment

Below, embodiments of the present invention are described with reference to the accompanying drawings.

Fig. 1 is the block diagram of the example when an embodiment of the invention are applied to the right steering jiggering, and Fig. 2 is a front view, and Fig. 3 is a left side view, and Fig. 4 is a birds-eye view, and Fig. 5 and Fig. 6 are the exploded perspective views of wanting portion.

Among Fig. 1,1 is the column type electric power-assisted steering apparatus, be contained in the Steering gear 3 in steering shaft 2 rotations freely, this steering shaft 2 has the 2a of steering handwheel department of assembly that is used to assemble steering handwheel (not shown), described Steering gear 3 links with reducing gearbox 4, on this reducing gearbox 4, be equipped with the electro-motor 5 that constitutes by the brush motor, axially the prolonging of this electro-motor 5 in direction with the axial quadrature of Steering gear 3.

At this, the double-sleeve structure of pipe 3a and outer tube 3b in Steering gear 3 adopts, make and reducing gearbox 4 between the impact energy of connecting part when absorbing crumple, with the crumple stroke of guaranteeing to be scheduled to.And the outer tube 3b of Steering gear 3 and reducing gearbox 4 are installed in body side by upper mounting bracket 6 and bottom installation bracket 7.Bottom installation bracket 7 utilizes installs board 7a and a pair of supporting board 7b formation, and described installation board 7a is installed on the body-side member (not shown), and described a pair of supporting board 7b maintenance predetermined space below this installation board 7a prolongs abreast.And as shown in Figure 7, the front end of supporting board 7b rotates freely via pivot 7c and links with support 4b, and this support 4b is integrally formed with lid 4a, and the lower end side that this lid 4a is provided in reducing gearbox 4 is a vehicle front side.

And upper mounting bracket 6 possesses: board 6a is installed, and this installation board 6a is installed on the body-side member (not shown); Square box shape support 6b, this square box shape support 6b is formed on this installation board 6a; And leaning device 6c, this leaning device 6c is formed on this square box shape support 6b, is used to support the outer tube 3b of Steering gear 3.At this, board 6a is installed utilizes pair of right and left chuck (capsule) 6d and slip board 6f to constitute, described a pair of chuck 6d is installed on the body-side member (not shown), described slip board 6f utilizes the 6e of resin injection portion (injection) to be fixed on these chucks 6d, when colliding, the impulsive force that effect makes it move to vehicle front on Steering gear 3, thereby slip board 6f slides to vehicle front with respect to chuck 6d, the 6e of resin injection portion is sheared, and this shearing load becomes crumple and begins load.And then, rotate by the tilting bar 6g that makes leaning device 6c, to remove bearing state, can with the pivot 7c of bottom installation bracket 7 center thus, the obliquity adjustment is carried out on Steering gear 3 edges up and down.

And as shown in Figure 7, steering shaft 2 utilizes input shaft 2a and output shaft 2c to constitute, and the upper end of this input shaft 2a and steering handwheel (not shown) link, and this output shaft 2c links via the lower end of torsion bar 2b and this input shaft 2a, and covers torsion bar 2b.

In addition, as Fig. 5～shown in Figure 7, die cast forms reducing gearbox 4 by for example carrying out in material, for example aluminium, aluminum alloy, magnesium and the magnesium alloy with high-termal conductivity any.This reducing gearbox 4 possesses: worm screw incorporating section 12, and worm screw 11 is taken in this worm screw incorporating section 12, and this worm screw 11 is connected with the output shaft 5a of electro-motor 5; Worm gear incorporating section 14, this worm gear incorporating section 14 downside in this worm screw incorporating section 12 have the center shaft with the orthogonality of center shaft of worm screw incorporating section 12, are used to take in and worm screw 11 ingear worm gears 13; Torque sensor incorporating section 16, this torque sensor incorporating section 16 one and be attached at the rear side of this worm gear incorporating section 14 coaxially are used to take in torque sensor 15; Motor department of assembly 17, this motor department of assembly 17 is formed on the open end face of worm screw incorporating section 12, is used to install electro-motor 5; Post installation portion 18, this post installation portion 18 is formed on the aft end face of torque sensor incorporating section 16, is used to install the mounting flange 3c on the leading section that is formed at Steering gear 3; And control unit department of assembly 20, this control unit department of assembly 20 is across the part of worm screw incorporating section 12 and worm gear incorporating section 14, be formed in the central axis plane orthogonal with worm gear incorporating section 14 and torque sensor incorporating section 16, be used for assembly control unit 19.And reducing gearbox 4 is fixed on the Steering gear 3 by bolt 18a under the mounting flange 3c that makes Steering gear 3 is connected to state on the post installation portion 18.

At this, as shown in Figure 7, torque sensor 15 constitutes like this: by magnetic the input shaft 2a of steering shaft 2 and the twisting states between the output shaft 2c are detected, utilize a pair of magnetic test coil 15a and 15b to detect the manipulation torque that is delivered to steering shaft, spiral head and spiral tail at these a pair of magnetic test coil 15a and 15b are connected with external connection terminals 15c respectively, 15d and 15e, 15f, described external connection terminals 15c, 15d and 15e, 15f is along outstanding to the outside abreast with the direction of the orthogonality of center shaft of Steering gear 3, the protrusion of these external connection terminals 15c～15f forms L word shape in the central axes ground bending of central portion and Steering gear 3.

And, in electro-motor 5, near in the position of the 5b of this mounting flange portion be assembled to control unit 19 in the control unit department of assembly 20 near outstanding bus (bus-bar) 5c and the 5d that is formed with as splicing ear on the opposed positions, this bus 5c and 5d and built-in brush directly link, towards with the axis direction of electro-motor 5 rectangular vehicle body rear and with the center shaft almost parallel of Steering gear 3.On the leading section of these buses 5c and 5d, be equipped with the slotted hole 5e that runs through for fixing Screw.At this, as shown in Figure 8, bus 5c and 5d are made of circular-arc conductor portion 5i and 5j and portion of terminal 5m and 5n respectively, be provided in the plastic brush supporting mass 5f described circular-arc conductor portion 5i and 5j mutually insulated, be connected with 2 groups of brush 5g, 5h respectively, this brush supporting mass 5f has armature (armature) through hole in bottom center; Described portion of terminal 5m and 5n prolong to foreign side abreast from the mutual opposed end of these circular-arc conductor portion 5i and 5j.And electro-motor 5 is connected to the 5b of its mounting flange portion in the motor department of assembly 17 of reducing gearbox 4, connects worm screw 11 on its output shaft 5a, and bus 5c and 5d are prolonged installation to the vehicle body rear.

In addition, with reference to Fig. 9 as can be known, the upper side of control unit department of assembly 20 in the worm gear incorporating section 14 of worm screw incorporating section 12 and downside thereof that is formed on the reducing gearbox 4 is formed with smooth attachment face 20a, upper surface in torque sensor incorporating section 16 is formed with the tabular surface 20b with smooth attachment face 20a quadrature, observe from left surface, smooth attachment face 20a and tabular surface 20b form L word shape.And, on the aft end face of motor department of assembly 17, more also be formed with the narrow framework attachment face 20c of width than this smooth attachment face abreast by the position of rear side with smooth attachment face 20a.And the central portion of the left and right directions of the tabular surface 20b of the external connection terminals 15c～15f of torque sensor 15 from torque sensor incorporating section 16 is outstanding.

As Fig. 5, Fig. 6 and shown in Figure 10, be assemblied in control unit 19 in this control unit department of assembly 20 by constituting: the metal power module substrate 23 that permeability to heat is high as the lower part, this power module substrate 23 directly is fixed on the smooth attachment face 20a across thermal grease, and this power module substrate 23 is used to install and utilizes H bridge circuit that field effect transister equipower on-off element constitutes or the pulse width modulation circuit equipower module that drives the power switch component of this H bridge circuit to what electro-motor 5 carried out drive controlling; The synthetic resin system framework 24 of oblong frame shape, this synthetic resin system framework 24 is around this power module substrate 23; Control basal plate 25, on this control basal plate 25, be equipped with through hole 25a～25d, and micro-control unit (MCU) and external equipment thereof is installed, external connection terminals 15c～the 15f that is installed on the torque sensor 15 in these synthetic resin system framework 24 fronts directly is applied among this through hole 25a～25d, described micro-control unit is according to from the torque detection value of torque sensor 15 or from the speed of a motor vehicle detected value of not shown car speed sensor, calculate and handle the auxiliary current command value, carry out Current Feedback Control according to this manipulation auxiliary current command value and the detected value of exporting to the motor current of electro-motor 5, calculate voltage instruction value, thus the steering auxiliary force that is produced by electro-motor 5 is controlled to the pulse width modulation circuit of power module substrate 23; And over cap 26, this over cap 26 is formed by conductive material, covers power module substrate 23, synthetic resin system framework 24, control basal plate 25 from rear side, directly utilizes Screw to be fixed in the control unit department of assembly 20.

At this, synthetic resin system framework 24 is by constituting integratedly as the lower part: the frame body 24a of oblong frame shape; Board 24b is installed, this installations board 24b give prominence to be formed on this chassis body 24a left end with bus 5c electro-motor 5 and the opposed position of 5d, be fixed on the framework attachment face 20c of reducing gearbox 4; Terminal base 24c, this terminal base 24c protrudes L word shape from this installation board 24b, has the splicing ear portion that the bus 5c of electro- motor 5 and 5d are electrically connected and are electrically connected with power module substrate 23; Power connector 24d, this power connector 24d is provided in the middle position of chassis body 24a right-hand member, is connected with battery (not shown); And signal connector 24e, carry out the transmitting-receiving of data between the control convenience of this signal connector 24e and each one of vehicle body, be connected with networks such as CAN.These power connectors 24d and signal connector 24e are formed with the adaptor union that continues in the right-hand member side respectively and insert opening, so that carry out from the right flank side of vehicle body with the direction of insertion of the exterior adaptor union that continues of their bonded assemblys.

And, for control basal plate 25, as shown in Figure 5 and Figure 6, in upper side large components such as cond 25e, power relay 25f are arranged along the left and right directions alignment arrangements with power module substrate 23 opposed front face side, in the rear side of control basal plate 25, be equipped with micro-control unit (MCU) 25g and external equipment thereof in lower side.

At this, as shown in Figure 7, cond 25e, the allocation position of large components such as power relay 25f is as follows: when being installed to control basal plate 25 on the synthetic resin system framework 24, cond 25e, power relay 25f etc. are positioned at than the position of the upper end-face edge that is formed on the control unit department of assembly 20 on the reducing gearbox 4 near the top by the large component of independence (discrete) component set-up, the front end of these large components is set at the state of giving prominence to 12 tops, worm screw incorporating section by the notch part 23a that is formed on power module substrate 23 tops, and the outshot of these large components covers 27 by part and covers.

Like this; by with large components such as cond 25e, power relay 25f above control basal plate 25; to the outstanding configuration of the upper side of worm screw incorporating section 12; thereby can effectively utilize the idle space of worm screw incorporating section 12 upper side in the reducing gearbox 4; and can make thickness attenuation from the power module substrate 23 of control unit 19 to over cap 26 aft end faces, can be with control unit 19 miniaturizations.

And the assembling with control unit 19 of said structure is carried out in the following manner.At first, apply after the thermal grease on the rigging position of the power module substrate 23 of the smooth attachment face 20a in the control unit department of assembly 20 of reducing gearbox 4, to thermal grease, utilize Screw to be fixed on the smooth attachment face 20a power module substrate 23 mountings.Then, with synthetic resin system framework 24 with the mode mounting around power module substrate 23 on smooth attachment face 20a and framework attachment face 20c.And, similarly utilize Screw that the installation board 24b of synthetic resin system framework 24 is fixed on the framework attachment face 20c of reducing gearbox 4.After this or before, the through hole 25a～25d with the external connection terminals 15c～15f of torque sensor 15 runs through control basal plate 25 then, utilizes Screw control basal plate 25 to be fixed to the face side of synthetic resin system framework 24.Then, external connection terminals 15c～15f and through hole 25a～25d welding is last, over cap 26 is assembled on the smooth attachment face 20a, and is assembled on the over cap 26 will partly cover 27 from the mode of front face side covering large component.

Then, assembling Steering gear 3, steering shaft 2, worm screw 11, worm gear 13 are assembled electro-motor 5 at last, utilize Screw that bus 5c and 5d are fixed on the terminal base 24c of control unit 19.

Like this, the position of the smooth attachment face 20a of the thickness of control unit 19 and control unit department of assembly 20 is configured to: under the state in the control unit department of assembly 20 that control unit 19 is assembled to reducing gearbox 4, the aft end face position of the lid 26 of control unit 19 and the rearmost end position of reducing gearbox 4 are positioned at the position than the close front side of head of bolt 18a, described bolt 18a is used for fixing the mounting flange 3c of Steering gear 3, backstop when the mounting flange 3c of described Steering gear 3 becomes Steering gear and shrinks when crumple, control unit 19 is assembled in following position: the moving-member when control unit 19 can be with crumple when crumple described later interferes.

And,,, can alleviate influence to radio noise so tail off from the noise of motor wire harness radiation owing to need not between electro-motor and control unit, to be provided with motor wire harness (motorharness).

And, side opposite at control unit 19 with electro-motor 5, the right flank side that is vehicle is equipped with power connector 24d and signal connector 24e, electro-motor 5, control unit 19 and power connector 24d and signal connector 24e configuration in-line, battery side adaptor union and network side adaptor union are connected on power connector 24d and the signal connector 24e easily, and power connector 24d is in the position near earth point, this earth point is arranged on the position, the left and right sides, passenger compartment side of the engine room of common vehicle, thereby can shorten the length of the ground wire between power connector 24d and the earth point.And the closure between power connector 24d and signal connector 24e and the double-type adaptor union is horizontal direction, can prevent the intrusion of water droplet or dust.

The action of above-mentioned embodiment then, is described.

At first, in order to assemble electric power-assisted steering apparatus 1, at the torque sensor incorporating section of reducing gearbox 4 16 internal fixation configuration torque sensor 15, the front end of the external connection terminals 15c～15f of this torque sensor 15 prolongs to the vehicle body rear along the peripheral part of Steering gear 3.

Then, assembly control unit 19 in the control unit department of assembly 20 of reducing gearbox 4.The assembling of this control unit 19 is following to be carried out: at first, on smooth attachment face 20a, apply thermal grease, and mounting power module substrate 23 on thermal grease then, and utilize Screw to be fixed on the smooth attachment face 20a.Under this state, with around the mode of power module substrate 23 with synthetic resin system framework 24 mountings to smooth attachment face 20a, the installation board 24b of synthetic resin system framework 24 contacted with the framework attachment face 20c of reducing gearbox 4 and utilize Screw to fix.In addition, in the front of synthetic resin system framework 24, be vehicle body rear side fixed control substrate 25, make the external connection terminals 15c～15f of torque sensor 15 run through the through hole 25a～25d of control basal plate 25, and after the external connection terminals 15c～15f welding with through hole 25a～25d and torque sensor 15, installation cover 26 constitutes control unit 19 thus.

Then, on reducing gearbox 4, assemble after steering shaft 2, Steering gear 3, worm screw 11 and the worm gear 13 etc., at last electro-motor 5 is installed in the motor department of assembly 17 of reducing gearbox 4, the bus 5c and the 5d of electro-motor 5 is fixed on the terminal base 24c of control unit 19 with Screw.

By constituting control unit 19 as described above, need not via the motor wire harness, just on the terminal base 24c that the bus 5c and the 5d of electro-motor 5 can be directly electrically connected to control unit 19, and need not via signal cable, just the external connection terminals 15c～15f of torque sensor 15 and the through hole 25a～25d of control basal plate 25 directly can be electrically connected.Therefore, can make to be electrically connected the length minimum between control unit 19 and electro-motor 5 and the torque sensor 15, can make the wiring resistance minimum, can suppress power loss, and can reduce electric noise.

And, be formed with near on the synthetic resin system that the is formed on framework 24 in control unit 19 and bus 5c electro-motor 5 and the 5d bonded assembly terminal base 24c board 24b is installed, this installation board 24b is fixed on being formed on the framework attachment face 20c in the motor department of assembly 17 of reducing gearbox 4, therefore can suppress following situation: terminal base 24c is different from the vibration of reducing gearbox 4 because of vibration of vehicle produces, thereby on terminal base 24c, produce stress concentration, can improve the rigidity of terminal base 24c.

And, the heat-producing power module substrate 23 of following that constitutes control unit 19 directly contacts with smooth attachment face 20a in the control unit department of assembly 20 of reducing gearbox 4 across thermal grease, any formation that this reducing gearbox 4 adopts in aluminium, aluminum alloy, magnesium and the magnesium alloy, so the heating of power module substrate directly can be diffused into reducing gearbox 4 as the big caloic of heat absorption capacity via thermal grease, can prevent reliably that power module substrate 23 is in super heat.Like this, by between power module substrate 23 and smooth attachment face 20a, applying thermal grease, can further improve radiating effect to reducing gearbox 4.

And, owing to utilization followed the power model of formation such as heat-producing field effect transister be installed on the power module substrate 23, the control elements such as micro-control unit 25g that To Be Protected from Heat are installed on the control basal plate 25, so the heating of power module substrate 23 can not be directly delivered to control basal plate 25, the warming-up effect that can stop power module substrate 23 reliably is to control basal plate 25.And, be configured in the top owing to be installed on heat generating components such as cond 25e on the control basal plate 25, thus can prevent reliably heat that heat generating components produces to below and the control element that is provided in opposition side exert an influence.And, because large components such as relay, cond are contained in the idle space of upper side, so can effectively utilize idle space, with control unit self miniaturization.

In addition; over cap 26 has electric conductivity; directly utilize Screw to be fixed in the control unit department of assembly 20 of reducing gearbox 4; so can bring into play effectiveness, the electromagnetic noise that the field effect transister that can prevent the H bridge circuit produces when carrying out HF switch leaks into the outside and becomes radio noise.

In addition, by at the top of the torque sensor incorporating section 16 of reducing gearbox 4 configuration control unit 19, thereby can shorten reducing gearbox 4 single-piece axial lengths, realize miniaturization.

And, after being installed to upper mounting bracket 6 and bottom installation bracket 7 on the body-side member, to be fitted on the power connector 24d and signal connector 24e of control unit 19 with the continue connector device that continues of networks such as adaptor union and CAN of battery and earth point bonded assembly outside respectively from vehicle body right flank side, finish the assembling of electric power-assisted steering apparatus 1 thus.

Like this, because can be from the outside adaptor union that continues being connected on power connector 24d and the signal connector 24e, so can easily both be connected as the right flank side in the vehicle body outside.And power connector 24d is in the position near earth point, and this earth point is arranged on the position, the left and right sides, passenger compartment side of the engine room of common vehicle, thereby can shorten the length of the ground wire between power connector 24d and the earth point.In addition, the closure between power connector 24d and signal connector 24e and the double-type adaptor union is horizontal direction, can prevent the intrusion of water droplet or dust.

By the way, under situation about power connector 24d and signal connector 24e being arranged at above the control unit 19, and the interval between the body-side member is narrow, the operation of adaptor union bonded assembly is poor, and the unfavorable condition that exists water droplet or dust to invade easily, but,, can eliminate the problems referred to above by power connector 24d and signal connector 24e are arranged at the vehicle outside direction.

And, because the side opposite that power connector 24d and signal connector 24e are formed on synthetic resin system framework 24 with electro-motor 5, so can not be subjected to the influence of the heat of heat-producing electro-motor 5 fully, and because the permeability to heat of synthetic resin system framework 24 is low, so can cover the heat-producing influence of electro-motor 5 more reliably.

Under this normal condition, as shown in Figure 1, in upper mounting bracket 6, slip board 6f is fixed on by the 6e of resin injection portion and constitutes on the chuck 6d that board 6a is installed.

When finishing the assembling of this electric power-assisted steering apparatus 1, the tilting bar 6g of upper mounting bracket 6 is rotated, remove the tilt-lock state thus, by under this state, pivot 7c with bottom installation bracket 7 is that Steering gear 3 is rotated at the center, thereby can adjust obliquity.

And, when the not shown ignition lock that makes vehicle be in on-state, from battery during to power module substrate 23 and control basal plate 25 supply capabilities, carry out to handle aux. controls by micro-control unit (MCU) and handle, calculate according to the detected value of torque sensor 15 and not shown car speed sensor and handle the auxiliary current command value.Handle the auxiliary current command value and, carry out the current feedback processing according to this, calculate voltage instruction value by the detected motor current of motor current test section.By this voltage instruction value being offered the gate driver circuit of power module substrate 23, control the H bridge circuit, thereby motor drive current flows to electro-motor 5, drives electro-motor 5, to produce the required steering auxiliary force of forward or reverse direction.

Therefore, produce the cooresponding steering auxiliary force of manipulation torque with steering handwheel by electro-motor 5, this steering auxiliary force passes to the output of steering shaft via worm screw 11 and worm gear 13, can handle steering handwheel with light actuating force thus.

Under this state, if when crumple took place, the occupant contacted with graphic steering handwheel, the impulsive force that effect is forwards slided Steering gear 3, then as Figure 12～shown in Figure 14, the 6e of resin injection portion between the chuck 6d of upper mounting bracket 6 and the slip board 6f is sheared, thereby in the mounting flange 3c of Steering gear 3 side, outer tube 3b absorbs impulsive force, slide with respect to interior pipe 3a simultaneously, with the head butt as the bolt 18a that shrinks backstop, thereby guarantee necessary crumple stroke, Steering gear 3 shrinks.

When Steering gear 3 shrinks like this, be installed in its parts on every side near control unit 19, yet, this control unit 19 is disposed under the state of having guaranteed predetermined crumple stroke not the position that interferes with moving-member, therefore can guarantee necessary crumple stroke, can not take place to interfere and the situation of obstruction crumple with moving-member.

In addition, crumple stroke during in order to ensure the generation crumple, the situation of considering control unit 19 conquassation is also arranged, as mentioned above, this control unit 19 is difficult to control the conquassation of synthetic resin system framework 24, and the problem of deviation appears in the amount of energy when having crumple, yet, in the present embodiment, in the guaranteeing of crumple stroke, do not consider the conquassation of control unit 19, so can when crumple, guarantee stable amount of energy according to setting value.

In addition, illustrated that in the above-described embodiment power module substrate 23 adopts the situation of the metal substrate formation with high thermal conductivity, yet, also can be provided as the metal substrate of high heat conduction board in addition, power module substrate 23 is installed on the smooth attachment face 20a of control unit department of assembly 20 across metal substrate and thermal grease, in addition, the power module substrate 23 that utilizes metal substrate to constitute metal substrate and the thermal grease via other setting can also be assembled on the smooth attachment face 20a.

And, illustrated in the above-described embodiment to carry out the situation that the adaptor union ways of connecting is set to power connector 24d and signal connector 24e the vehicle outside of synthetic resin system framework 24 from vehicle outside, but be not limited thereto, the closure of aerial lug can be set for along the axial fore-and-aft direction of Steering gear 3 or any directions such as direction that intersect with it, can arrange power connector 24d and signal connector 24e according to the closure of hope.

In addition, the bus 5c of electro-motor 5 and the situation that 5d prolongs point-blank have been described in the above-described embodiment, but be not limited thereto, also can shown in Figure 15 (a), make bus 5c and 5d outstanding to foreign side earlier, follow axial bending to electro-motor 5, extend to foreign side along direction afterwards, under this situation, can guarantee elasticity at the curve of bus 5c and 5d with axial quadrature, so the residual stress that produces in the time of can relaxing terminal and be connected with terminal base can prolong life-span of bus 5c and 5d.Similarly, also can shown in Figure 15 (b), give prominence to the axial of electro-motor 5 earlier, extend to foreign side along direction afterwards with axial quadrature.

And, illustrated in the above-described embodiment and bus 5c and 5d have been set on the electro-motor 5, the situation of terminal base 24c is set on control unit 19, but be not limited thereto, also can terminal base be set on the electro-motor 5, on control unit 19, bus be set, and external connection terminals is not limited to bus, can use electric connection terminal arbitrarily.

In addition, illustrated that in the above-described embodiment external connection terminals 15c～15f with torque sensor 15 is bent into L word shape and extends through the situation of the through hole 25a～25d of control basal plate 25, but be not limited thereto, in order easily external connection terminals 15c～15f to be extended through among through hole 25a～25d, can be at the guiding parts that the side setting has funnelform guide surface that runs through of external connection terminals 15c～15f of through hole 25a～25d.

And, the situation that the external connection terminals 15c～15f of torque sensor 15 is formed L word shape has been described in the above-described embodiment, but be not limited thereto, external connection terminals 15c～15f can be formed linearity, utilize welding or fusion etc. to be electrically connected along the connection pads that is formed on the control basal plate 25, perhaps, external connection terminals is formed the clamping terminal, be installed on the control basal plate 25.

In addition, illustrated in the above-described embodiment reducing gearbox 4 control unit department of assembly 20 smooth attachment face 20a for the situation on the plane of the orthogonality of center shaft of Steering gear 3, but be not limited thereto, also smooth attachment face 20a can be formed with respect to the face of the face tilt of the orthogonality of center shaft of Steering gear 3.

And, illustrated in the above-described embodiment electro-motor 5, control unit 19 and adaptor union 24d, 24e along with the situation of the line configuration in-line of the orthogonality of center shaft of Steering gear 3, but be not limited thereto the line configuration in-line that also can intersect along center shaft with Steering gear 3.

In addition, the situation that is positioned at the right-hand member side with opening that is connected of the power connector 24d of control unit 19 and signal connector 24e has been described in the above-described embodiment, but be not limited thereto, also can form axial direction, from the axial assembling aerial lug of Steering gear 3 with connecting with opening along Steering gear 3.

In addition, following situation has been described in the above-described embodiment: when constituting control unit 19, at first, utilize Screw that power module substrate 23 is fixed to after smooth attachment face 20a goes up, fixedly synthetic resin system framework 24, utilize Screw that control basal plate 25 is fixed on this synthetic resin system framework 24, but be not limited thereto, also can be on synthetic resin system framework 24 after installation power module substrate 23 and the control basal plate 25, synthetic resin system framework 24 is fixed on the smooth attachment face 20a, can also a part and the power module substrate 23 of synthetic resin system framework 24 is fastening together.

In addition, illustrated that in the above-described embodiment power module substrate 23 adopts the situation of the metal substrate formation with high thermal conductivity, yet, also metal substrate can be set in addition, power module substrate 23 is installed on the smooth attachment face 20a of control unit department of assembly 20 across metal substrate and thermal grease, in addition, the power module substrate 23 that utilizes metal substrate to constitute further can also be assembled on the smooth attachment face 20a across the metal substrate and the thermal grease of other setting.

And, following situation has been described in the above-described embodiment: when constituting control unit 19, at first, utilize Screw that power module substrate 23 is fixed on after smooth attachment face 20a goes up, fixedly synthetic resin system framework 24, utilize Screw that control basal plate 25 is fixed on this synthetic resin system framework 24, but be not limited thereto, after also can being installed to power module substrate 23 and control basal plate 25 on the synthetic resin system framework 24, synthetic resin system framework 24 is fixed on the smooth attachment face 20a, in addition, can also a part and the power module substrate 23 of synthetic resin system framework 24 is fastening together.

And, situation as electro-motor 5 application of brushes motors has been described in the above-described embodiment, but be not limited thereto, can also use brushless motor, under this situation, bus 5c and 5d are connected the supply side of each excitation coil mutually, and the gate driver circuit of grid of the inverter circuit that for example has field effect transister (FET) that drives brushless motor being installed and being utilized pulse width modulating signal to drive the field effect transister of inverter circuit gets final product on power module substrate 23.

In addition, the situation that applies the present invention to the right steering jiggering has been described in the above-described embodiment, but be not limited thereto, under the situation that is applied to the left steering jiggering, for reducing gearbox 4, the configuration of electro-motor 5 and control unit 19, the vertical surface that clips the center shaft by Steering gear 1 is with in the face of the title mode, promptly at the right side of control unit 19 configuration electro-motor 5, the power connector 24d of control unit 19 and signal connector 24e are disposed at the left side to get final product, and electro-motor 5 can be disposed at vehicle outside, power connector 24d and signal connector 24e are disposed at vehicle interior side.

And, in the above-described embodiment, the situation that adaptor union 24d, 24e are set at the vehicle interior side of control unit 19 configuration electro-motor 5, in the vehicle outside of control unit 19 has been described, but be not limited thereto, layout according to vehicle, can electro-motor 5 be arranged at vehicle outside with respect to control unit 19, adaptor union 24d, 24e are arranged at vehicle interior side, can also adaptor union 24d, 24e be set in a side opposite of control unit 19 with electro-motor 5.

Utilizability on the industry

At least can provide following electric power-assisted steering apparatus: the control module that will comprise the power module substrate of following heating directly is installed on the big reduction gear box of caloic, can improve radiating effect thus.

And, can provide following electric power-assisted steering apparatus: in the vehicle interior side of control module and a side in the outside electro-motor is installed, in the vehicle interior side of control module and the opposing party in the outside outside splicing connector is set, can prevent thus the intrusion of water droplet or dust, and can increase the free degree of the closure of outside splicing connector, in addition, carry out easily connector and connect, can not be subjected to the impact of electro-motor heating in the connector side.

In addition, can provide following electric power-assisted steering apparatus: control module is disposed at when the crumple stroke of the steering column of reduction gear box not the position that can interfere with moving-member, the predetermined crumple stroke of steering column can be guaranteed thus, and the stable amount of energy according to setting value can be when crumple, obtained.

Claims (23)

1. electric power-assisted steering apparatus, this electric power-assisted steering apparatus possesses: dress is transmitted the steering shaft of handling torque in the Steering gear, this Steering gear; Reducing gearbox, this reducing gearbox and this Steering gear link; And electro-motor, this electro-motor passes to described steering shaft via the speed reduction gearing in this reducing gearbox with steering auxiliary force, it is characterized in that,

In the described reducing gearbox, in the motor department of assembly of the end face that is formed at the direction of intersecting, be equipped with described electro-motor with described steering shaft, and, in the control unit department of assembly that is formed at outside face near this motor department of assembly, be equipped with the control unit that this electro-motor is carried out drive controlling, described control unit comprises at least: control basal plate is equipped with the command value operational part that the drive command value of described electro-motor is carried out computing on this control basal plate; And power module substrate, on this power module substrate power model is installed, described power model is according to coming described electro-motor is carried out drive controlling and follows heating from the drive command value of described command value operational part, described power module substrate directly is assemblied in the control unit department of assembly of described reducing gearbox, the outstanding configuration of upper side of the worm screw incorporating section of the worm screw that the large component on the described control basal plate links to the output shaft that is used to take in described electro-motor, thereby be in the upper side idle space of the control unit department of assembly in the described reducing gearbox, guaranteed the crumple stroke thus.

2. electric power-assisted steering apparatus according to claim 1 is characterized in that,

Described reducing gearbox has at least: the worm screw that links with the output shaft of described electro-motor is taken in worm screw incorporating section, this worm screw incorporating section; The worm gear that links with described steering shaft is taken in worm gear incorporating section, this worm gear incorporating section; And torque sensor incorporating section, this torque sensor incorporating section is connected with this worm gear incorporating section, take in described torque sensor, and link with Steering gear, the control unit department of assembly that is used to assemble described control unit is formed on the peripheral part of described worm screw incorporating section, worm gear incorporating section and torque sensor incorporating section, and described control unit directly is electrically connected respectively with described torque sensor with described electro-motor and described control unit.

3. electric power-assisted steering apparatus according to claim 1 is characterized in that,

Described electro-motor is provided in a side of the vehicle interior side and the vehicle outside of described control unit, is provided in the opposing party of the vehicle interior side and the vehicle outside of described control unit with the outside adaptor union bonded assembly adaptor union that continues that continues.

4. electric power-assisted steering apparatus according to claim 2 is characterized in that,

Described electro-motor is provided in a side of the vehicle interior side and the vehicle outside of described control unit, is provided in the opposing party of the vehicle interior side and the vehicle outside of described control unit with the outside adaptor union bonded assembly adaptor union that continues that continues.

5. electric power-assisted steering apparatus according to claim 3 is characterized in that,

The continue closure of adaptor union of described continue adaptor union and described outside is set at vehicle-width direction.

6. electric power-assisted steering apparatus according to claim 4 is characterized in that,

The continue closure of adaptor union of described continue adaptor union and described outside is set at vehicle-width direction.

7. according to each the described electric power-assisted steering apparatus in the claim 3～6, it is characterized in that,

The described adaptor union that continues is made of power connector that adjoins each other and signal connector.

8. according to each the described electric power-assisted steering apparatus in the claim 3～6, it is characterized in that,

Electro-motor is provided in the vehicle interior side of described control unit, and the described adaptor union that continues is provided in the vehicle outside of this control unit.

9. electric power-assisted steering apparatus according to claim 7 is characterized in that,

Electro-motor is provided in the vehicle interior side of described control unit, and the described adaptor union that continues is provided in the vehicle outside of this control unit.

10. according to each the described electric power-assisted steering apparatus in the claim 3～6, it is characterized in that,

Described electro-motor and described control unit directly are electrically connected by splicing ear and terminal base.

11. electric power-assisted steering apparatus according to claim 7 is characterized in that,

Described electro-motor and described control unit directly are electrically connected by splicing ear and terminal base.

12. electric power-assisted steering apparatus according to claim 8 is characterized in that,

Described electro-motor and described control unit directly are electrically connected by splicing ear and terminal base.

13. electric power-assisted steering apparatus according to claim 9 is characterized in that,

Described electro-motor and described control unit directly are electrically connected by splicing ear and terminal base.

14. each the described electric power-assisted steering apparatus according in the claim 1～6 is characterized in that,

The position that moving-member when described control unit is provided in not crumple stroke with the Steering gear of described reducing gearbox interferes.

15. electric power-assisted steering apparatus according to claim 7 is characterized in that,

The position that moving-member when described control unit is provided in not crumple stroke with the Steering gear of described reducing gearbox interferes.

16. electric power-assisted steering apparatus according to claim 8 is characterized in that,

The position that moving-member when described control unit is provided in not crumple stroke with the Steering gear of described reducing gearbox interferes.

17. electric power-assisted steering apparatus according to claim 9 is characterized in that,

The position that moving-member when described control unit is provided in not crumple stroke with the Steering gear of described reducing gearbox interferes.

18. electric power-assisted steering apparatus according to claim 10 is characterized in that,

The position that moving-member when described control unit is provided in not crumple stroke with the Steering gear of described reducing gearbox interferes.

19. electric power-assisted steering apparatus according to claim 11 is characterized in that,

The position that moving-member when described control unit is provided in not crumple stroke with the Steering gear of described reducing gearbox interferes.

20. electric power-assisted steering apparatus according to claim 12 is characterized in that,

The position that moving-member when described control unit is provided in not crumple stroke with the Steering gear of described reducing gearbox interferes.

21. electric power-assisted steering apparatus according to claim 13 is characterized in that,

The position that moving-member when described control unit is provided in not crumple stroke with the Steering gear of described reducing gearbox interferes.

22. electric power-assisted steering apparatus according to claim 14 is characterized in that,

Described reducing gearbox has at least: the worm screw that links with the output shaft of described electro-motor is taken in worm screw incorporating section, this worm screw incorporating section; The worm gear that links with described steering shaft is taken in worm gear incorporating section, this worm gear incorporating section; And torque sensor incorporating section, this torque sensor incorporating section is connected with this worm gear incorporating section, take in described torque sensor, and link with Steering gear, the control unit department of assembly that is used to assemble described control unit is formed on the peripheral part of described worm screw incorporating section, worm gear incorporating section and torque sensor incorporating section, the contraction backstop of the Steering gear with the front end of described torque sensor incorporating section during as crumple, the contraction backstop side end face set positions that is assemblied in the control unit in the described control unit department of assembly becomes than shrinking backstop near worm gear incorporating section side.

23. each the described electric power-assisted steering apparatus according in the claim 15～21 is characterized in that,

Described reducing gearbox has at least: the worm screw that links with the output shaft of described electro-motor is taken in worm screw incorporating section, this worm screw incorporating section; The worm gear that links with described steering shaft is taken in worm gear incorporating section, this worm gear incorporating section; And torque sensor incorporating section, this torque sensor incorporating section is connected with this worm gear incorporating section, take in described torque sensor, and link with Steering gear, the control unit department of assembly that is used to assemble described control unit is formed on the peripheral part of described worm screw incorporating section, worm gear incorporating section and torque sensor incorporating section, the contraction backstop of the Steering gear with the front end of described torque sensor incorporating section during as crumple, the contraction backstop side end face set positions that is assemblied in the control unit in the described control unit department of assembly becomes than shrinking backstop near worm gear incorporating section side.

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