CN101334324B - Torque detecting apparatus and electric power steering apparatus - Google Patents
Torque detecting apparatus and electric power steering apparatus Download PDFInfo
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- CN101334324B CN101334324B CN2008101336245A CN200810133624A CN101334324B CN 101334324 B CN101334324 B CN 101334324B CN 2008101336245 A CN2008101336245 A CN 2008101336245A CN 200810133624 A CN200810133624 A CN 200810133624A CN 101334324 B CN101334324 B CN 101334324B
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Abstract
The invention provides torque detecting apparatus and electric power steering apparatus. The torque detecting apparatus comprises a first shaft and a second shaft connected coaxially to each other through a connecting shaft, a permanent magnet fixed to the first shaft, a plurality of soft magnetic members having a collar provided therein, fitted by pressing with the second shaft and disposed in a magnetic field of the permanent magnet to form a magnetic circuit, and a detector for detecting magnetic flux generated from the soft magnetic members, wherein the soft magnetic members are integrally molded with a mold body made of synthetic resin, and when a torque is applied to the first shaft or the second shaft, the torque is detected based on an output of the detector. The collar is made of a non-magnetic material.
Description
Technical field
The present invention relates to a kind of torque detecting apparatus, it is particularly suitable on the electric power-assisted steering apparatus etc. of vehicle, have: with the 1st and the 2nd of connection shaft coaxial binding, fixedly be located at the permanent magnet on the 1st, be pressed into via axle sleeve and be fixed on a plurality of soft-magnetic bodies that form magnetic circuit in the 2nd magnetic field of going up and being configured in permanent magnet, detect the detecting device of the magnetic flux of soft-magnetic body induction, a plurality of soft-magnetic bodies, utilize the molded formation of synthetic resin integrated, when applying moment of torsion to the 1st or the 2nd, this torque detecting apparatus detects moment of torsion based on the output of detecting device.
In addition, the present invention relates to a kind of torque detecting apparatus, be particularly suitable for the electric power-assisted steering apparatus of vehicle etc., have: with the 1st of the coaxial binding of connection shaft and the 2nd, fixedly be located at permanent magnet on the 1st, be fixed on a plurality of soft-magnetic bodies of forming magnetic circuit in the 2nd magnetic field of going up and being configured in permanent magnet, detect detecting device at the magnetic flux of soft-magnetic body generation, when applying moment of torsion to the 1st and the 2nd, based on the output of detecting device, detect moment of torsion.
In addition, the present invention relates to torque detecting apparatus, and has an electric power-assisted steering apparatus of this torque detecting apparatus, be particularly suitable for the electric power-assisted steering apparatus of vehicle etc., torque detecting apparatus has the 1st and the 2nd with the coaxial binding of connection shaft, fixedly be located at the permanent magnet on the 1st, be fixed on a plurality of soft-magnetic bodies of formation magnetic circuit in the 2nd magnetic field of going up and being configured in permanent magnet, respond to a plurality of auxiliary soft-magnetic body with the soft-magnetic body magnetic coupling from the magnetic flux of soft-magnetic body, detect the detecting device of the magnetic flux of auxiliary soft-magnetic body induction, when applying moment of torsion to the 1st or the 2nd, based on the output of detecting device, detect moment of torsion.
Background technology
In steering device of vehicles, there is the drive motor assisted control to turn to, alleviate the electric power-assisted steering apparatus of driver's burden.Electric power-assisted steering apparatus, have and be connected the input shaft handled on the turning member (bearing circle, handle), be connected output shaft on the steered wheel, link the connection shaft of input shaft and output shaft by pinion wheel and tooth bar etc., torque detecting apparatus, by the windup-degree that produces at connection shaft, detection imposes on the steering torque of input shaft, based on the steering torque that detects, the motor that turns to auxiliary usefulness of drive controlling and output shaft interlock.In electric power-assisted steering apparatus so, in the past, used the magnetic that adopts coil to detect position of rotation to detect the formula resolver, or detected the pick-up unit etc. of the optical encoders, angle sensors that sees through of light.
In addition, open in the 2003-149062 communique the spy, a kind of torque sensor has been proposed, exploded perspective view as Figure 1A, shown in the drawing in side sectional elevation of the longitudinal diagram of Figure 1B and Fig. 1 C, have input shaft 1 and output shaft 2 by torsion bar 3 coaxial bindings, fixedly be located at the permanent magnet 5 of 24 utmost points of the ring-type on the input shaft 1, by being fixed on the output shaft 2 and being configured in a plurality of soft-magnetic body 4a that form magnetic circuit in the magnetic field of permanent magnet 5, the yoke 4 that 4b constitutes, magnetic coupling is at yoke 4a, induction on the 4b is from yoke 4a, 2 ring concentrators 8 of the magnetic flux of 4b, 8, detected set magnet ring 8,2 Magnetic Sensors 6 of the magnetic flux of 8 inductions, 6 (Hall IC), when input shaft 1 was applied moment of torsion, this torque sensor was based on Magnetic Sensor 6,6 output detects moment of torsion.
In addition, the applicant opens the spy and to have proposed a kind of torque sensor in the 2005-98821 communique, it utilizes above-mentioned torque sensor, shown in Figure 1A～Fig. 1 C, by the molded integratedly yoke 4a of synthetic resin, 4b, by molded integratedly ring concentrator 8,8 of synthetic resin and Magnetic Sensor 6,6.
In above-mentioned torque sensor, utilize the integrally moulded yoke 4a of synthetic resin, 4b, via not shown axle sleeve, be pressed into and be fixed on the output shaft 2, still, axle sleeve is magnetic (S43C).Therefore, have the misgivings that axle sleeve influences above-mentioned magnetic circuit; And when output shaft is pressed into axle sleeve, producing smear metal, this smear metal influences the problem of the misgivings of magnetic circuit.
In addition, in above-mentioned torque sensor, when utilizing the molded ring concentrator 8,8 of synthetic resin, Magnetic Sensor 6,6 and circuit substrate, divide 2 moulding.That is, in the 1st moulding, utilizing the molded electronic unit of synthetic resin (for example hot melt) with flexibility is Magnetic Sensor 6,6 and circuit substrate, in the 2nd moulding, utilizes the molded ring concentrator 8,8 of synthetic resin (for example PBT) with rigidity.So, mitigation has the harmful effect of the synthetic resin of rigidity to electronic unit.
But, existing problems, that is, and the synthetic resin that uses in the 1st moulding, can not guarantee the adaptation with the machinery of circuit substrate, if heating several times is flexible repeatedly, synthetic resin will be peeled off from circuit substrate etc., as shown in Figure 2, produces gap 30 between synthetic resin and circuit substrate 19.
In addition, in above-mentioned torque sensor, need be used for the electric wiring and the connector component that are connected with the control part of electric power-assisted steering apparatus, exist to cause the problem that component costs rises and components number increases.
Summary of the invention
The present invention proposes in view of the above fact, and its purpose is to provide a kind of Ah too time yoke to be pressed into the axle sleeve that is fixed on the output shaft does not have influence to magnetic circuit torque detecting apparatus.
In addition, a kind ofly produce smear metal when being pressed into output shaft in the axle sleeve that is fixed on output shaft in that yoke is pressed into even the object of the present invention is to provide, this smear metal does not influence the torque detecting apparatus of magnetic circuit yet.
In addition, the object of the present invention is to provide a kind of synthetic resin of molded use can guarantee can not peel off, not have the torque detecting apparatus of the misgivings that produce the gap from electronic unit with adaptation, the synthetic resin of the machinery of electronic unit.
In addition, the object of the present invention is to provide and a kind ofly do not need to be used for and torque detecting apparatus outside electric wiring that is connected and connector component, that can seek to reduce component costs and reduction components number.
In addition, the object of the present invention is to provide a kind of electric wiring and electric power-assisted steering apparatus connector component, that can seek to reduce component costs and cut down components number of being connected with torque detecting apparatus of not needing to be used for.
Torque detecting apparatus of the present invention, have: with the 1st and the 2nd of connection shaft coaxial binding, fixedly be located at the permanent magnet on the 1st, be pressed into via axle sleeve and be fixed on a plurality of soft-magnetic bodies that form magnetic circuit in described the 2nd magnetic field of going up and being configured in described permanent magnet, detecting device with the magnetic flux that detects this soft-magnetic body induction, described a plurality of soft-magnetic body, utilize synthetic resin molded, form integrated, when applying moment of torsion to described the 1st or the 2nd, output based on described detecting device, detect described moment of torsion, the torque detecting apparatus that constitutes like this, it is characterized in that: described axle sleeve is a nonmagnetic material.
Torque detecting apparatus of the present invention is characterized in that: the material of described axle sleeve is softer than described the 2nd material.
Torque detecting apparatus of the present invention, have: with the 1st and the 2nd of connection shaft coaxial binding, fixedly be located at the permanent magnet on the 1st, be fixed on a plurality of soft-magnetic bodies of formation magnetic circuit in described the 2nd magnetic field of going up and being configured in described permanent magnet, reach the circuit substrate that is connected with this detecting device with the detecting device that detects the magnetic flux that in this soft-magnetic body, produces, described detecting device and circuit substrate, utilize synthetic resin molded, when applying moment of torsion to described the 1st or the 2nd, output based on described detecting device, detect described moment of torsion, the torque detecting apparatus that constitutes like this, it is characterized in that: one or more through holes are set on described circuit substrate, in this through hole, fill described synthetic resin.
In this torque detecting apparatus, the 1st and the 2nd, with the coaxial binding of connection shaft, permanent magnet fixedly is located on the 1st.A plurality of soft-magnetic bodies are fixed on the 2nd, are configured in the magnetic field of permanent magnet, form magnetic circuit, and detecting device detects the magnetic flux that produces in soft-magnetic body.Circuit substrate is connected with detecting device, utilizes synthetic resin mould detecting device and circuit substrate, when applying moment of torsion to the 1st or the 2nd, based on the output of detecting device, detects moment of torsion.One or more through holes are set on circuit substrate, in this through hole, fill described synthetic resin.
Torque detecting apparatus of the present invention, have, with the 1st and the 2nd of the coaxial binding of connection shaft, fixedly be located at the permanent magnet on the 1st, be fixed on a plurality of soft-magnetic bodies of formation magnetic circuit in described the 2nd magnetic field of going up and being configured in described permanent magnet, magnetic coupling is responded to a plurality of auxiliary soft-magnetic body from the magnetic flux of this soft-magnetic body on this soft-magnetic body, detecting device with the magnetic flux that detects this auxiliary soft-magnetic body induction, and the circuit substrate that is connected with this detecting device, described detecting device and circuit substrate, utilize synthetic resin molded, when applying moment of torsion to described the 1st or the 2nd, output based on described detecting device, detect described moment of torsion, the torque detecting apparatus that constitutes like this, it is characterized in that: one or more through holes are set on described circuit substrate, in this through hole, fill described synthetic resin.
In this torque detecting apparatus, the 1st and the 2nd, with the coaxial binding of connection shaft, permanent magnet fixedly is located on the 1st.A plurality of soft-magnetic bodies are fixed on the 2nd, are configured in the magnetic field of permanent magnet, form magnetic circuit, a plurality of auxiliary soft-magnetic bodies, and magnetic coupling is on this soft-magnetic body, and induction is from the magnetic flux of soft-magnetic body, and detecting device detects the magnetic flux of auxiliary soft-magnetic body induction.Circuit substrate is connected with detecting device, and detecting device and circuit substrate utilize the synthetic resin mould, when applying moment of torsion to the 1st or the 2nd, based on the output of detecting device, detects moment of torsion.One or more through holes are set on circuit substrate, in this through hole, fill described synthetic resin.
Torque detecting apparatus of the present invention, have: with the 1st and the 2nd of connection shaft coaxial binding, fixedly be located at the 1st and the 2nd respectively coaxially and go up magnetic coupling permanent magnet and a plurality of soft-magnetic body, the a plurality of auxiliary soft-magnetic body of magnetic coupling on this soft-magnetic body, detect one or more detecting devices of the magnetic flux of this auxiliary soft-magnetic body induction, the plastic molding that forms with molded described auxiliary soft-magnetic body and detecting device, output based on described detecting device, detection imposes on described the 1st or the 2nd moment of torsion, it is characterized in that: described detecting device, have and be used for and the outside a plurality of pins that are connected, this pin is provided with from described molding is outstanding.
Electric power-assisted steering apparatus of the present invention, it is characterized in that: have: the motor of assisted diversion, torque detecting apparatus as claimed in claim 5, be accommodated in the basket and control the drive control part of described motor based on the torque drive that described torque detecting apparatus detects, described basket, have from the outstanding circuit substrate that is provided with a plurality of through holes that is provided with of this basket, described drive control part, by in described through hole, inserting respectively, be connected with described torque detecting apparatus from the outstanding a plurality of pins that are provided with of the molding of described torque detecting apparatus.
According to torque detecting apparatus of the present invention, can realize a kind of axle sleeve that is fixed on the output shaft does not have influence to magnetic circuit torque detecting apparatus that yoke is pressed into.
According to torque detecting apparatus of the present invention, even can realize a kind ofly producing smear metal when being pressed into output shaft in the axle sleeve that is fixed on output shaft in that yoke is pressed into, this smear metal does not influence the torque detecting apparatus of magnetic circuit yet.
According to torque detecting apparatus of the present invention, the synthetic resin that can realize a kind of molded use can guarantee with the adaptation of the machinery of electronic unit, synthetic resin can not peel off, not have the torque detecting apparatus of the misgivings that produce the gap from electronic unit.
According to torque detecting apparatus of the present invention, can realize a kind ofly not needing to be used for and torque detecting apparatus outside electric wiring that is connected and connector component, that can seek to reduce component costs and reduction components number.
According to torque detecting apparatus of the present invention, can realize a kind of electric wiring and electric power-assisted steering apparatus connector component, that can seek to reduce component costs and cut down components number of being connected with torque detecting apparatus of not needing to be used for.In addition, can on the circuit substrate of the drive control part of electric power-assisted steering apparatus, constitute by the circuit of the detecting device of centralized management torque detecting apparatus.
Other purposes of the present invention and formation will be clearer by the explanation of following embodiment.
Description of drawings
Figure 1A～Fig. 1 C is a key diagram of representing the formation of torque detecting apparatus in the past.
Fig. 2 is a key diagram of representing the problem points of torque detecting apparatus in the past.
Fig. 3 A～Fig. 3 C is the key diagram of formation of the embodiment 1 of expression torque detecting apparatus of the present invention.
Fig. 4 is the yoke of expression torque detecting apparatus of the present invention and the exploded perspective view of ring concentrator.
Fig. 5 is the longitudinal diagram that expression is installed in torque detecting apparatus of the present invention configuration example on the electric power-assisted steering apparatus.
Fig. 6 A and Fig. 6 B are the key diagrams of the stationary state that is pressed into yoke and axle sleeve of expression torque detecting apparatus shown in Figure 5.
Fig. 7 A～Fig. 7 C is the key diagram of formation of the embodiment 2 of expression torque detecting apparatus of the present invention.
Fig. 8 is the yoke of expression torque detecting apparatus of the present invention and the exploded perspective view of ring concentrator.
Fig. 9 is the amplification profile that amplifies the circuit substrate periphery of presentation graphs 7B and Fig. 7 C.
Figure 10 A～Figure 10 C is the key diagram of formation of the embodiment 3 of modal representation torque detecting apparatus of the present invention.
Figure 11 is the yoke of expression torque detecting apparatus of the present invention and the exploded perspective view of ring concentrator.
Figure 12 is the longitudinal diagram of formation of the embodiment 3 of expression electric power-assisted steering apparatus of the present invention.
Figure 13 is the stereographic map of the outward appearance example of expression electronic-controlled installation housing.
Figure 14 is the key diagram of the connection status of modal representation torque detecting apparatus and electronic-controlled installation housing.
Figure 15 A～Figure 15 D is the key diagram of the work of expression electric power-assisted steering apparatus of the present invention and torque detecting apparatus.
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.
(embodiment 1)
Fig. 3 A～Fig. 3 C is the key diagram of formation of the embodiment 1 of expression torque detecting apparatus of the present invention.Fig. 3 A is an exploded perspective view, and Fig. 3 B is a longitudinal diagram, and Fig. 3 C is the transverse section body of the A-A ' face of Fig. 3 B.This torque detecting apparatus is via the coaxial shape of torsion bar 3 (connection shaft) the ground binding input shaft 1 (the 1st) and the output shaft (the 2nd) in thin footpath.Input shaft 1 and output shaft 2 are attached on the torsion bar 3 via pin 9 respectively.
On input shaft 1, fixedly install (24 utmost point) permanent magnet 5 of drum coaxially, this permanent magnet 5 at circumferencial direction by uniformly-spaced magnetizing 24 utmost points (N, the S utmost point each 12 utmost points).On output shaft 2, via axle sleeve 25 described later (Fig. 5), be pressed into the yoke 4 of stationary cylinder shape coaxially, this yoke 4 is provided with the suitable permanent magnet 5 that surrounds with gap at radial direction.
Yoke 4 as shown in Figure 4, has two yoke 4a, 4b (soft-magnetic body) that the pawl 10 of 12 isoceles triangle shapes of extending to the direction vertical with its plate face is set by circumference uniformly-spaced on tabular ring.
About two yoke 4a, 4b, with separately pawl 10 at circumferencial direction by the stagger state of ground subtend of proper spacing, the molding 24 that is made of synthetic resin is molded as drum.But yoke 4a, 4b and faces permanent magnet 5 subtends expose from molding 24.
In addition, yoke 4a, 4b, not applying the neutral condition of moment of torsion, the front end of pawl 10 separately disposes in the mode of the boundary of the N utmost point that points to permanent magnet 5 and the S utmost point.
This torque detecting apparatus also has respectively with yoke 4a, 4b magnetic coupling and responds to two ring concentrators 8,8 from the magnetic flux of yoke 4a, 4b respectively.As shown in Figure 4, ring concentrator 8,8 disposes abreast, has than the mutual approaching flat part of other parts, inserts two Hall IC 6 in the gap of this approaching part.
The molding 24 of molded yoke 4a, 4b and the peristome of permanent magnet 5 for example with plastic seal member 40 sealings, prevent the intrusion of dust such as iron filings, iron powder.
The peristome of the molding 28 of the molding 24 of molded yoke 4a, 4b and molded ring concentrator 8,8, for example with plastic seal member 38 sealings, lower openings portion prevents the intrusion of dust such as iron filings, iron powder with plastic seal member 39 sealings.
Fig. 5 is the longitudinal diagram that expression is installed in the torque detecting apparatus of above-mentioned formation the configuration example on the electric power-assisted steering apparatus.This electric power-assisted steering apparatus is gone up binding input shaft 1 in not shown turning to (handle), at the hollow bulb of input shaft 1, and the first half of chimeric movably torsion bar 3, the upper end of torsion bar 3 is attached on the input shaft 1 by pin 9a.In the Lower Half of the chimeric movably torsion bar 3 of hollow bulb of output shaft 2, the bottom of torsion bar 3 is attached on the output shaft 2 by pin 9b, in the bottom of the chimeric movably input shaft 1 in top of the hollow bulb of output shaft 2.Output shaft 2 is attached in the not shown steering mechanism.
On output shaft 2, fixedly install worm gear 15, on worm gear 15, mesh the worm screw 14 that links with the not shown motor shaft that turns to stand-by motor.
The coaxial permanent magnet 5 that fixedly installs on input shaft 1.In addition,, constitute two yoke 4a, 4b of yoke 4, appropriate gap is set surround permanent magnet 5 at radial direction by molding 24 molded formation one, yoke 4, by axle sleeve 25, coaxial being pressed into is fixed on the output shaft 2.
The material specific output axle 2 of axle sleeve 25 is soft, when being pressed into output shaft 2, even produce smear metal, also only produces from axle sleeve 25.From the smear metal that axle sleeve 25 produces, owing to be nonmagnetic material, therefore the magnetic circuit to yoke 4a, 4b etc. does not have magnetic influence.
Around yoke 4a, 4b, set two magnetic-coupled with yoke 4a, 4b respectively, mutual uniformly-spaced ring concentrators 8,8 of configured in parallel.Between the mutual approaching flat part of ring concentrator 8,8, insert two Hall IC 6.
8,8 and two Hall IC 6 of ring concentrator utilize molding 28 integrally molded, and molding 28 is fixed on the shell 17 of electric power-assisted steering apparatus.Respectively going between of Hall IC 67 is soldered on substrate 16, and substrate 16 is supplied with the power supply that makes Hall IC 6 work, obtains the output that detects through Hall IC 6.
The peristome of molding 24 and permanent magnet 5, with seal member 40 sealings, sealed parts 38 sealings of the upper opening portion of molding 24 and molding 28, sealed parts 39 sealings of lower openings portion prevent the intrusion of dust such as iron filings, iron powder respectively.
(embodiment 2)
Fig. 7 A～Fig. 7 C is the key diagram of formation of the embodiment 2 of expression torque detecting apparatus of the present invention.Fig. 7 A is an exploded perspective view, and Fig. 7 B is a longitudinal diagram, and Fig. 7 C is the transverse section body of the A-A ' face of Fig. 7 B.This torque detecting apparatus, via the torsion bar 3 (connection shaft) in thin footpath, coaxial shape ground links input shaft 1 (the 1st) and output shaft (the 2nd).Input shaft 1 and output shaft 2 link via pin 9 and torsion bar 3 respectively.
On input shaft 1, (24 utmost point) permanent magnet 5 of the drum that fixedly installs coaxially, this permanent magnet 5 at circumferencial direction by uniformly-spaced magnetizing 24 utmost points (N, the S utmost point each 12 utmost points).Be pressed into the yoke 4 of stationary cylinder shape on output shaft 2 coaxially, this yoke 4 is provided with the suitable permanent magnet 5 that surrounds with gap at radial direction.Yoke 4 as shown in Figure 8, has two yoke 4a, 4b (soft-magnetic body) that the pawl 10 of 12 isoceles triangle shapes of extending to the direction vertical with its plate face is set by circumference uniformly-spaced on tabular ring.About two yoke 4a, 4b, with separately pawl 10 at circumferencial direction by the stagger state of ground subtend of proper spacing, utilize the molding 24 that constitutes by synthetic resin to be molded as drum.But yoke 4a, 4b and faces permanent magnet 5 subtends expose from molding 24.
In addition, yoke 4a, 4b, not applying the neutral condition of moment of torsion, the front end of pawl 10 separately disposes in the mode of the boundary of the N utmost point that points to permanent magnet 5 and the S utmost point.
This torque detecting apparatus in addition, has respectively two ring concentrators 8,8 (auxiliary soft-magnetic body) of responding to respectively with yoke 4a, 4b magnetic coupling from the magnetic flux of yoke 4a, 4b.Ring concentrator 8,8, as shown in Figure 8, configuration has than the mutual approaching flat part of other parts abreast, inserts one or more Hall IC 6 (detecting device) in the gap of this approaching part.
But the face of the mutual subtend of yoke 4a, 4b and ring concentrator 8,8 exposes from molding 24,28b.In addition, when utilizing synthetic resin molded, divide 2 moulding, in the 1st moulding, utilization is by having the molding 28a that flexible synthetic resin (for example heat fusing) constitutes, the electronic unit of molded Hall IC 6,6 and circuit substrate 19a in the 2nd moulding, utilizes the molded ring concentrator 8,8 of molding 28b that is made of the synthetic resin with rigidity (for example PBT).
On circuit substrate 19a, shown in the amplification drawing in side sectional elevation of Fig. 9, a plurality of through holes 48 are set, the table side of circuit substrate 19a and the molding 28a of dorsal part by filling synthetic resin in through hole 48, mechanically connect.Thus, even heating is flexible repeatedly, molding 28a can not peel off from circuit substrate 19a yet, can not produce the gap between molding 28a and circuit substrate 19a yet.
(embodiment 3)
Figure 10 A～Figure 10 C is the key diagram of formation of the embodiment 3 of modal representation torque detecting apparatus of the present invention.Figure 10 A is an exploded perspective view, and Figure 10 B is a longitudinal diagram, and Figure 10 C is the transverse section body of the A-A ' face of Figure 10 B.This torque detecting apparatus, via the torsion bar 3 (connection shaft) in thin footpath, coaxial shape ground links input shaft 1 (the 1st) and output shaft (the 2nd).Input shaft 1 and output shaft 2 are attached on the torsion bar 3 via register pin 9 respectively.
On input shaft 1, fixedly install (24 utmost point) permanent magnet 5 of drum coaxially, this permanent magnet 5 at circumferencial direction by uniformly-spaced magnetizing 24 utmost points (N, the S utmost point each 12 utmost points).
Be pressed into the yoke 4 of stationary cylinder shape on output shaft 2 coaxially, this yoke 4 is provided with the suitable permanent magnet 5 that surrounds with gap at radial direction.Yoke 4 as shown in figure 11, has two yoke 4a, 4b (soft-magnetic body) that the pawl 10 of 12 isoceles triangle shapes of extending to the direction vertical with its plate face is set by circumference uniformly-spaced on tabular ring.
About two yoke 4a, 4b, with separately pawl 10 at circumferencial direction by the stagger state of ground subtend of proper spacing, utilize the molding 24 that constitutes by synthetic resin to be molded as drum.But the face with permanent magnet 5 subtends of yoke 4a, 4b exposes from molding 24.
In addition, yoke 4a, 4b, not applying the neutral condition of moment of torsion, the front end of pawl 10 separately disposes in the mode of the boundary of the N utmost point that points to permanent magnet 5 and the S utmost point.
This torque detecting apparatus in addition, has respectively two ring concentrators 8,8 (auxiliary soft-magnetic body) of responding to respectively with yoke 4a, 4b magnetic coupling from the magnetic flux of yoke 4a, 4b.Ring concentrator 8,8, as shown in figure 11, configuration has than the mutual approaching flat part of other parts abreast, inserts 2 Hall IC 6 (Hall element, detecting device) in the gap of this approaching part.
Figure 12 is the longitudinal diagram of formation of embodiment 3 of the electric power-assisted steering apparatus of the present invention of the torque detecting apparatus of expression with formation like this.This electric power-assisted steering apparatus is attached at input shaft 1 in not shown the turning to (handle), at the hollow bulb of input shaft 1, and the first half of chimeric movably torsion bar 3, the upper end of torsion bar 3 is attached on the input shaft 1 by register pin 9a.At the hollow bulb of output shaft 2, the Lower Half of chimeric movably torsion bar 3, the bottom of torsion bar 3 is attached on the output shaft 2 by register pin 9b, in the top of the hollow bulb of output shaft 2, the bottom of chimeric movably input shaft 1.Output shaft 2 is with not shown steering mechanism's binding.
On output shaft 2, fixedly install worm gear 15, on worm gear 15, mesh the worm screw 14 that links with the not shown motor shaft that turns to stand-by motor.
Fixedly install permanent magnet 5 on input shaft 1 coaxially, coaxial being pressed into fixed two yoke 4a, 4b on output shaft 2, and these two yoke 4a, 4b appropriate gap radially is set surround permanent magnet 5.Around yoke 4a, 4b, set two respectively with the magnetic-coupled mutually ring concentrator 8,8 of configured in parallel uniformly-spaced of yoke 4a, 4b.Between the mutual approaching flat part of ring concentrator 8,8, insert two Hall IC 6.
Yoke 4a, 4b utilize molding 24 integrally molded, and 8,8 and two Hall IC 6 of ring concentrator utilize molding 28 integrally molded, and molding 28 is fixed on the shell 17 of electric power-assisted steering apparatus.A plurality of pins 27 of being connected with the outside of Hall IC 6 of being used for, outstanding with the state that a direction is arranged from molding 28, be connected respectively with from the outstanding printed base plate 18 (PCB, glass epoxy substrate etc.) that is provided with of electronic-controlled installation housing 20 (basket).
In electronic-controlled installation housing 20, take in the drive control part of electric power-assisted steering apparatus and the circuit of relevant Hall IC 6 (noise resistance capacitor etc.).Electronic-controlled installation housing 20 is fixed on the shell 17 or not shown car body side.
Figure 13 is the stereographic map of the outward appearance of expression electronic-controlled installation housing 20.
Electronic-controlled installation housing 20 is a rectangular shape, is equipped with printed base plate 18 (circuit substrate) from 1 end face longitudinally, and the state of arranging with a direction on printed base plate 18 is provided with 6 through holes 29 (through hole).
Torque detecting apparatus and electronic-controlled installation housing 20 27 insert corresponding through hole 29 by making respectively selling of Hall IC 6 respectively, and shown in the mode declaration pattern specification figure of Figure 14, solder is inserted into respectively sells 27 and through hole 29, connects.Thus, connect Hall IC 6 and the circuit of relevant Hall IC 6 and the drive control part of electric power-assisted steering apparatus.
Below, the electric power-assisted steering apparatus of explanation in embodiment 1～embodiment 3 and the work of torque detecting apparatus are described.When input shaft 1 not being applied moment of torsion if do not carry out steering operation, each pawl 10 of yoke 4a, 4b, shown in Figure 15 B, owing to equate with the N utmost point of permanent magnet 5 and the area of S utmost point subtend, therefore the magnetic flux that enters from the N utmost point and equate to the magnetic flux that the S utmost point is drawn does not produce magnetic flux between yoke 4a and yoke 4b.
When carrying out steering operation input shaft 1 being applied the moment of torsion of a direction, torsion bar 3 produces and reverses, and each pawl 10 of yoke 4a, 4b and the relative position of permanent magnet 5 change.At this moment, for example, shown in Figure 15 A, with the area of each pawl 10 subtend of yoke 4a, the N of permanent magnet 5 is greatly in the S utmost point, and the magnetic flux that enters from the N utmost point is greater than the magnetic flux of drawing to the S utmost point.In addition, with the area of each pawl 10 subtend of yoke 4b, the N of permanent magnet 5 is minimum in the S utmost point, and the magnetic flux that enters from the N utmost point is less than the magnetic flux of drawing to the S utmost point.As a result, produce from the magnetic flux of yoke 4a to yoke 4b, big more with the difference of the area of the N utmost point of each pawl 10 subtend and the S utmost point, this magnetic flux density increases more.
In addition, when carrying out steering operation input shaft 1 being applied the moment of torsion of other direction, torsion bar 3 reverses to producing with above-mentioned opposite direction, and each pawl 10 of yoke 4a, 4b and the relative position of permanent magnet 5 change.At this moment, for example, shown in Figure 15 C, with the area of each pawl 10 subtend of yoke 4a, the N of permanent magnet 5 is minimum in the S utmost point, and the magnetic flux that enters from the N utmost point is less than the magnetic flux of drawing to the S utmost point.In addition, with the area of each pawl 10 subtend of yoke 4b, the N of permanent magnet 5 is greatly in the S utmost point, and magnetic flux one side who enters from the N utmost point is greater than the magnetic flux of drawing to the S utmost point.As a result, produce from the magnetic flux of yoke 4b to yoke 4a, big more with the difference of the area of the N utmost point of each pawl 10 subtend and the S utmost point, this magnetic flux density increases more.
And if the torsion angle of torsion bar 3 is the variation that electric angle-180～180 degree (mechanical angle-15～15 degree) is shown in the magnetic flux density that produces in the gap between above-mentioned yoke 4a and yoke 4b accordingly, just become the sinusoidal wave shape shown in Figure 15 D.The actual scope of using, the rigidity according to torsion bar 3 is no more than-90～90 degree.
According to the magnetic flux density in the gap between above-mentioned yoke 4a and yoke 4b, to be responded to by ring concentrator 8,8 respectively at the magnetic flux that yoke 4a, 4b produce, the flux concentrating of induction is detected by Hall IC 6,6 in the mutual approaching part of ring concentrator 8,8. Hall IC 6,6 can be passed through ring concentrator 8,8, detects the average flux density that produces in full week at yoke 4a, 4b.
Thus, Hall IC 6,6 can detect magnetic flux density according to the magnetic flux that produces at ring concentrator 8,8 respectively, promptly can detect magnetic flux density according to the moment of torsion that imposes on input shaft 1.That is, can learn to impose on the moment of torsion that turns to based on the magnetic flux density that detects.Especially, the detection side by making Hall IC 6,6 is on the contrary, obtains their output poor, and the various influences that can offset swing, the temperature characterisitic of Hall IC 6,6 and axial detection sensitivity etc. can improve accuracy of detection.
In addition, in above-mentioned embodiment 2, even remove ring concentrator 8,8, Hall IC 6,6 directly detects the magnetic flux that yoke 4a, 4b produce, and also can detect moment of torsion equally.
In addition, in above-mentioned embodiment 3, the drive control part in the electronic-controlled installation housing 20, the magnetic flux density based on Hall IC 6 detects promptly imposes on the moment of torsion that turns to, and controls the not shown motor that turns to auxiliary usefulness, reduces moment of torsion.Motor is given the manipulation steering force to not shown steering mechanism, thus, alleviates and will impose on the manipulation steering force that turns to.
Claims (4)
1. torque detecting apparatus,
Have:
With the 1st and the 2nd of the coaxial binding of connection shaft,
Fixedly be located at the permanent magnet on the 1st,
A plurality of soft-magnetic bodies, it is fixed on described the 2nd, and is configured in the magnetic field of described permanent magnet, form magnetic circuit and
The detecting device of the magnetic flux that detection produces in this soft-magnetic body and the circuit substrate that is connected with this detecting device;
Wherein, described detecting device and circuit substrate utilize synthetic resin molded and shaped;
When applying moment of torsion,, detect described moment of torsion based on the output of described detecting device to described the 1st or the 2nd;
One or more through holes are set on described circuit substrate, in this through hole, fill described synthetic resin.
2. torque detecting apparatus,
Have:
With the 1st and the 2nd of the coaxial binding of connection shaft,
Fixedly be located at the permanent magnet on the 1st,
A plurality of soft-magnetic bodies, it is fixed on described the 2nd, and is configured in the magnetic field of described permanent magnet, forms magnetic circuit,
A plurality of auxiliary soft-magnetic bodies, itself and this soft-magnetic body magnetic coupling, induction from the magnetic flux of this soft-magnetic body and
The detecting device that detects the magnetic flux of this auxiliary soft-magnetic body induction reaches the circuit substrate that is connected with this detecting device;
Wherein, described detecting device and circuit substrate utilize synthetic resin molded and shaped;
When applying moment of torsion,, detect described moment of torsion based on the output of described detecting device to described the 1st or the 2nd;
One or more through holes are set on described circuit substrate, in this through hole, fill described synthetic resin.
3. torque detecting apparatus,
Have:
With the 1st and the 2nd of the coaxial binding of connection shaft,
Magnetic-coupled permanent magnet and a plurality of soft-magnetic body, it fixedly is located at respectively on the 1st and the 2nd coaxially,
A plurality of auxiliary soft-magnetic bodies, itself and this soft-magnetic body magnetic coupling,
One or more detecting devices, its detect this auxiliary soft-magnetic body induction magnetic flux and
Plastic molding, it is used for molded and shaped described auxiliary soft-magnetic body and detecting device;
Wherein, based on the output of described detecting device, detect the moment of torsion impose on described the 1st or the 2nd;
Described detecting device has and is used for and the outside a plurality of pins that are connected, and this pin is by from the outstanding setting of described molding.
4. electric power-assisted steering apparatus,
Have:
The motor of assisted diversion,
The described torque detecting apparatus of claim 3 and
Drive control part, it is accommodated in the basket, based on the moment of torsion that described torque detecting apparatus detects, the described motor of drive controlling;
Wherein, described basket has from the outstanding circuit substrate that is provided with a plurality of through holes that is provided with of this basket;
Described drive control part is given prominence to a plurality of pins that are provided with by inserting from the molding of described torque detecting apparatus respectively, and is connected with described torque detecting apparatus in described through hole.
Applications Claiming Priority (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004222302 | 2004-07-29 | ||
| JP2004222302A JP2006038767A (en) | 2004-07-29 | 2004-07-29 | Device for detecting torque |
| JP2004-222302 | 2004-07-29 | ||
| JP2004-248850 | 2004-08-27 | ||
| JP2004249063A JP2006064587A (en) | 2004-08-27 | 2004-08-27 | Torque detection apparatus and electric power steering system |
| JP2004248850 | 2004-08-27 | ||
| JP2004248850A JP2006064578A (en) | 2004-08-27 | 2004-08-27 | Torque detecting device |
| JP2004-249063 | 2004-08-27 | ||
| JP2004249063 | 2004-08-27 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100884408A Division CN100523756C (en) | 2004-07-29 | 2005-07-29 | Torque detecting apparatus and electric power steering apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101334324A CN101334324A (en) | 2008-12-31 |
| CN101334324B true CN101334324B (en) | 2011-11-09 |
Family
ID=35903907
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100884408A Expired - Fee Related CN100523756C (en) | 2004-07-29 | 2005-07-29 | Torque detecting apparatus and electric power steering apparatus |
| CN2008101336245A Expired - Fee Related CN101334324B (en) | 2004-07-29 | 2005-07-29 | Torque detecting apparatus and electric power steering apparatus |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100884408A Expired - Fee Related CN100523756C (en) | 2004-07-29 | 2005-07-29 | Torque detecting apparatus and electric power steering apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2006038767A (en) |
| CN (2) | CN100523756C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107532957A (en) * | 2015-04-27 | 2018-01-02 | 本田制锁有限公司 | Torque detecting apparatus |
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| JP2007212198A (en) * | 2006-02-07 | 2007-08-23 | Jtekt Corp | Torque detector and its manufacturing method |
| JP4871014B2 (en) * | 2006-04-24 | 2012-02-08 | カヤバ工業株式会社 | Torque sensor |
| JP4997474B2 (en) * | 2007-03-29 | 2012-08-08 | 株式会社ジェイテクト | Torque detection device |
| JP5382465B2 (en) * | 2008-08-01 | 2014-01-08 | 株式会社ジェイテクト | Electric power steering device |
| JP5513902B2 (en) * | 2010-01-12 | 2014-06-04 | カヤバ工業株式会社 | Torque sensor |
| KR101177618B1 (en) | 2010-03-08 | 2012-08-27 | 대성전기공업 주식회사 | Non-contacting type torque sensor for steering system |
| JP5067676B2 (en) * | 2010-03-12 | 2012-11-07 | 株式会社デンソー | Sensor unit and magnetism collecting module |
| US9021895B2 (en) | 2010-05-14 | 2015-05-05 | Trw Automotive U.S. Llc | Torque sensor assembly and method for producing same |
| JP5776786B2 (en) | 2011-10-31 | 2015-09-09 | 日本精工株式会社 | Optical scale, optical scale manufacturing method, and optical encoder |
| KR101452559B1 (en) * | 2011-12-06 | 2014-10-21 | 주식회사 만도 | Pinion Sensor Assembly and Pinion Sensor Cover Assembly and Electric Power Steering Apparatus having The Same |
| JP5563549B2 (en) | 2011-12-16 | 2014-07-30 | 株式会社デンソー | Torque sensor |
| JP5871164B2 (en) * | 2012-03-02 | 2016-03-01 | 株式会社ジェイテクト | Vehicle steering system |
| JP6144459B2 (en) * | 2012-03-28 | 2017-06-07 | Ｋｙｂ株式会社 | Electric power steering device |
| JP5675700B2 (en) * | 2012-05-25 | 2015-02-25 | 株式会社日本自動車部品総合研究所 | Torque sensor |
| CN102951196A (en) * | 2012-11-23 | 2013-03-06 | 重庆亚宸汽车零部件有限公司 | Hall type sensing EPS speed reducer |
| JP6056458B2 (en) * | 2012-12-25 | 2017-01-11 | 株式会社ジェイテクト | Torque detection device and steering device including the same |
| US8960020B2 (en) * | 2013-03-15 | 2015-02-24 | Steering Solutions Ip Holding Corporation | Non-contacting torque sensor with injection molded magnets |
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| CN106133491B (en) * | 2014-03-28 | 2020-08-11 | 日立金属株式会社 | Soft magnetic member for torque sensor and torque sensor using the same |
| JP6327456B2 (en) * | 2014-05-19 | 2018-05-23 | 株式会社ジェイテクト | Torque sensor and electric power steering device |
| JP6311926B2 (en) * | 2014-06-18 | 2018-04-18 | 株式会社ジェイテクト | Torque sensor and electric power steering device |
| US10207733B2 (en) * | 2014-07-09 | 2019-02-19 | Hitachi Automotive Systems, Ltd. | Rotational angle detection apparatus and power steering apparatus |
| CN104071216B (en) * | 2014-07-10 | 2016-09-28 | 四川绵阳德鑫机械有限公司 | Automobile electric booster steering system |
| JP6683055B2 (en) * | 2016-07-27 | 2020-04-15 | 株式会社ジェイテクト | Torque detection device and electric power steering device |
| JP6726593B2 (en) * | 2016-10-05 | 2020-07-22 | Ｋｙｂ株式会社 | Torque sensor |
| CN106542019A (en) * | 2016-11-03 | 2017-03-29 | 中山市科力高自动化设备有限公司 | A kind of pressing production line for making electric boosting steering system part |
| JP2018179701A (en) * | 2017-04-11 | 2018-11-15 | Ｋｙｂ株式会社 | Magnetic detector, torque sensor, and electrically-driven power steering device |
| JP6791065B2 (en) * | 2017-04-28 | 2020-11-25 | 株式会社Ｓｏｋｅｎ | Torque detector and sensor module |
| JP2019041507A (en) * | 2017-08-25 | 2019-03-14 | 株式会社ジェイテクト | Motor device |
| JP6946917B2 (en) * | 2017-10-13 | 2021-10-13 | 株式会社ジェイテクト | Sensor device |
| CN109955890A (en) * | 2017-12-26 | 2019-07-02 | 长城汽车股份有限公司 | Steering mechanism and vehicle |
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| JPH0675018B2 (en) * | 1988-10-07 | 1994-09-21 | 光洋精工株式会社 | Torque sensor |
| JP3346268B2 (en) * | 1998-02-26 | 2002-11-18 | 日本精工株式会社 | Torque sensor |
| JP3307317B2 (en) * | 1998-02-26 | 2002-07-24 | 日本精工株式会社 | Torque sensor |
| JP2002340702A (en) * | 2001-05-11 | 2002-11-27 | Toyota Motor Corp | Method for joining constitution member made of soft magnetic powder material and torque sensor |
| JP3913657B2 (en) * | 2002-10-02 | 2007-05-09 | 株式会社日本自動車部品総合研究所 | Torque sensor |
| JP4190849B2 (en) * | 2002-10-07 | 2008-12-03 | 株式会社日本自動車部品総合研究所 | Torque sensor |
-
2004
- 2004-07-29 JP JP2004222302A patent/JP2006038767A/en active Pending
-
2005
- 2005-07-29 CN CNB2005100884408A patent/CN100523756C/en not_active Expired - Fee Related
- 2005-07-29 CN CN2008101336245A patent/CN101334324B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107532957A (en) * | 2015-04-27 | 2018-01-02 | 本田制锁有限公司 | Torque detecting apparatus |
| CN107532957B (en) * | 2015-04-27 | 2020-02-28 | 本田制锁有限公司 | Torque detection device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006038767A (en) | 2006-02-09 |
| CN1727859A (en) | 2006-02-01 |
| CN101334324A (en) | 2008-12-31 |
| CN100523756C (en) | 2009-08-05 |
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