CN101414770A - Rectilinear-motion actuator - Google Patents
Rectilinear-motion actuator Download PDFInfo
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- CN101414770A CN101414770A CNA200810149944XA CN200810149944A CN101414770A CN 101414770 A CN101414770 A CN 101414770A CN A200810149944X A CNA200810149944X A CN A200810149944XA CN 200810149944 A CN200810149944 A CN 200810149944A CN 101414770 A CN101414770 A CN 101414770A
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Abstract
A rectilinear-motion actuator includes a motor, a reduction gear mechanism coupled with a motor shaft of the motor, and a rectilinear, reciprocative motion mechanism for converting a rotary motion of a last-stage gear of the reduction gear mechanism to a rectilinear, reciprocative motion. The last-stage gear has a pin provided thereon which is offset from its center of rotation. The rectilinear, reciprocative motion mechanism includes a movable plate having a slit and allowing the pin to move within the slit. The slit is arranged orthogonally to the axis of the motor shaft. The longitudinal center of the slit is located on a line in parallel with the motor shaft axis and passing through the center of the last-stage gear. The axis of reciprocative motion of the movable plate is offset from the line passing through the center of the last-stage gear in a direction away from the motor shaft.
Description
Technical field
The present invention relates to a kind of linear motion actuator, its rotational motion with motor is transformed into straight reciprocating motion and exports this reciprocating motion, and it can be used for for example easy seat device for opening of automobile.
Background technology
Figure 11 shows the structure of the disclosed a kind of traditional linear motion actuator of Japanese Patent Application Publication thing (kokai) No.4-295249.In the linear motion actuator of Figure 11, electrode is installed on the interior mounting panel of framework; Worm screw is arranged on the motor shaft of motor; And come the conversion motor speed by worm gear with worm engaging.Worm gear is provided with linear reciprocating mechanism, and it can provide straight reciprocating motion.Specifically, be formed with elongated slot in the guide portion that is provided with on the worm gear.When worm gear rotated, being fixed in the pin that is provided with on the fixed head of worm gear can slide in elongated slot.At this moment, the bar that connects with guide portion supports and carries out straight reciprocating motion by the bar guiding piece that is arranged on the framework.
By the improved speed reducing ratio that adopts the worm reducing gear to realize, the linear motion actuator of Figure 11 has reached reducing of actuating unit size.But, since with the worm gear engaged worm perpendicular to straight reciprocating motion setting (being that motor shaft is perpendicular to bar), caused idle space.Even when bar and motor shaft be arranged in parallel, the width of actuating unit (along the size perpendicular to the measured actuating unit of the direction of straight reciprocating motion direction) is the summation of worm gear overall diameter and motor radius.This is unfavorable for reducing of size.
Summary of the invention
The objective of the invention is to address the above problem and a kind of linear motion actuator is provided, it shows the size that reduces by the width that reduces actuating unit, and wherein stagger and be converted to straight reciprocating motion to exert all one's strength in the most weak motive force position and almost not loss in the center of the center line of movable platen (corresponding to above-mentioned bar) and final stage gear.
In order to achieve the above object, linear motion actuator of the present invention comprises: motor; The reduction gear that connects with the motor shaft of motor; And linear reciprocating mechanism, be used for converting the rotational motion of the final stage gear of reduction gear to straight reciprocating motion.The final stage gear is provided with the pin that staggers with its center of rotation.Linear reciprocating mechanism comprises movable platen, and movable platen has the slit of preset width and length and allows pin to move in slit.The reciprocating axis of movable platen staggers with the straight line that passes the center of final stage gear.
Reduction gear have the worm screw of being fixed in motor shaft and with the worm gear of worm engaging.Movable platen has another slit, and to dividing, and described another slit receives the rotation axis of worm gear to avoid the interference of rotation axis and movable platen to the width of described another slit by the reciprocating axis of movable platen.Helical gear is coaxial to be arranged on the rotation axis of worm gear, and final stage gear and helical gear engagement.Connect the end that loaded output block coupling part is arranged on movable platen, with the reciprocating axis alignment of movable platen.The pin that is arranged on the final stage gear has sleeve outside mounted thereto.
Linear motion actuator of the present invention also comprises the position detecting mechanism of the position that is used to detect moving part.Rotating speed of motor or driving torque change according to the position of the moving part that is detected.Position detecting mechanism detects the turned position of final stage gear.
Be provided with elastomeric element and act on movable platen.Movable platen is a U-shaped structure, and the first arm and second arm are arranged on the relative both sides of straight line at the center of passing the final stage gear, and the axis of the first arm is consistent with reciprocating axis, and elastomeric element acts on second arm.Elastomeric element is a helical spring, and it increases the motive force of movable platen and be used as load in the promotion motion process of movable platen in the pulling motion process of movable platen.
Linear motion actuator of the present invention has following structure: the rotation axis of worm gear staggers with the straight line that passes the center of final stage gear and extends through the slit of movable platen.Therefore, linear motion actuator can be exerted all one's strength in the most weak motive force position and is converted to straight reciprocating motion and almost not loss.Equally, compare with the final stage gear, the diameter of worm gear can reduce, and can reduce the width of actuating unit thus.
Be used at linear motion actuator under the situation of easy seat device for opening, when opening seat and control line is returned lock seat by the operation of pulling control line, motor is subjected to load hardly; Therefore, rotating speed of motor increases, thereby noise increases.In order to address this problem, when control line was returned, series resistance can be connected in motor, and Xiang Guan voltage drop reduces rotating speed of motor thus.Alternatively, replace to use series resistance to come reducing motor,, can use the spring return movement that slows down by utilizing the compression of spring.Under the situation of using spring, when driving load, current of electric reduces also can strengthen actuating force.
Description of drawings
Fig. 1 is the top view according to the total structure of the linear motion actuator of first embodiment of the invention;
Fig. 2 is the cutaway view of the linear motion actuator of first embodiment shown in Figure 1;
Fig. 3 A and 3B are used to explain the action that the center of rotation by center line that makes movable platen and helical gear C (final stage gear) staggers and realizes;
Fig. 4 shows the exemplary circuit construct of the linear motion actuator that is used to drive first embodiment shown in Figure 1;
Fig. 5 is the top view according to the total structure of the linear motion actuator of second embodiment of the invention;
Fig. 6 is the vertical cutaway view along the linear motion actuator of second embodiment shown in Figure 5 that center line intercepted of movable platen;
Fig. 7 is the view that is used to explain the movable platen action;
The curve chart of Fig. 8 shows the output characteristic of linear motion actuator;
The curve chart of Fig. 9 shows the load current characteristic of viewed motor in the single reciprocal process of movable platen;
Figure 10 shows the exemplary circuit construct of the linear motion actuator that is used to drive second embodiment shown in Figure 5; And
Figure 11 shows the structure of traditional line motion actuator.
Embodiment
Present exemplary description the present invention.Fig. 1 is the top view according to the total structure of the linear motion actuator of first embodiment of the invention.Removed frame cover in the state shown in Fig. 1.Fig. 2 is the cutaway view of the linear motion actuator of first embodiment shown in Figure 1.Linear motion actuator comprises motor, reducing gear and has the linear reciprocating mechanism of movable platen.These parts and mechanism are arranged in (being made by for example resin) framework regularly.(being made by for example resin) frame cover is connected in the upside of framework.Motor for example can be common DC commutator motor.Shown motor is fixed in the groove that is provided with in the framework.Motor shaft is as motor output shaft, and stretches out towards the motor outside from the center of a side of electric machine casing.Reducing gear connects with motor shaft.
Reducing gear comprises: the worm screw of being fixed in motor shaft by for example interference fit; Worm gear (helical gear A); Helical gear B; With helical gear C as the final stage gear.Worm gear (helical gear A) is arranged to and worm engaging.The rotation axis that is supported rotationally by framework supports helical gear A at gear centre.Therefore, the rotation around motor shaft that is produced by motor is converted into the rotation that centers on perpendicular to the rotation axis of motor shaft, and is decelerated (slowing down with the speed reducing ratio of 61:1 in the embodiment shown) by worm screw and helical gear A.Next, in the embodiment shown, the rotation that passes to helical gear A is decelerated by the helical gear B on the rotating shaft that is fixed on helical gear A with the helical gear C of helical gear B engagement (slows down with the speed reducing ratio of 3.133:1 in the embodiment shown; Total reduction ratio is 191:1).
Next, by in the fixed-site that staggers with the center of helical gear C in the pin of helical gear C, the rotation of helical gear C is converted into the straight reciprocating motion of movable platen, movable platen has partly constituted line reciprocator.The direction of straight reciprocating motion and the parallel axes of motor shaft.Movable platen presents the vertical curve shape that is similar to alphabetical L.Movable platen has first slit (elongated hole) and second slit (elongated hole), is formed on the appropriate section of stretching to orthogonally each other.
First slit is arranged to, and vertically perpendicular to the axis of motor shaft, its longitudinal center is positioned at parallel with motor shaft and passes on the straight line of final stage gear centre for it.The pin that is arranged on the helical gear C can move in first slit.Sleeve is installed on pin with rotating manner outside slidably.When pin moved in first slit, sleeve rotated, and has reduced frictional force thus.The reciprocating motion axis of movable platen on leaving the direction of motor shaft with the straight line that passes the center of final stage gear stagger (being expressed as " A staggers " among Fig. 1).The center line (reciprocating axis) of movable platen of staggering has guaranteed that the width of actuating unit reduces, and as the detailed description of back, can exert all one's strength in the most weak motive force position is converted to straight reciprocating motion and almost not loss.
Second slit is arranged to, and to dividing, it vertically and parallel axes of motor shaft by the reciprocating motion axis of movable platen for its width.Second slit is used to receive the common pivot axis of helical gear A and helical gear B to avoid the interference of rotation axis and movable platen.Movable platen is by following guiding: in framework or frame cover groove is set, movable platen is mounted in this groove, can reciprocating motion be directed from relative both sides in limited mode simultaneously.Second groove is used as along the guiding piece perpendicular to location movable platen on the direction of motor shaft, and is used as the extra guiding piece of movable platen motion.
Therefore, second slit also staggers with the longitudinal center of first slit (therefore staggering with the center of helical gear C) leaving on the direction of motor shaft (therefore in Fig. 1 downwards).The A that staggers between the slit equals staggering between the center of rotation of the center of rotation of helical gear A and B and helical gear C.
Utilize above-mentioned structure, the motion in first slit that in movable platen, is provided with by pin, the rotation of motor is converted into the straight reciprocating motion of movable platen.The reciprocating far-end of movable platen has the output block coupling part with reciprocating axis alignment, and output block (control line or bar, not shown) is connected in the output block coupling part.The other end (not shown) of output block is connected in external loading, for example easy seat device for opening.Output block drives external loading along pulling or pushing direction.
Fig. 3 is used to explain the action that the center of rotation of center line (consistent second slit of locating with center line) and helical gear C (final stage gear) by making movable platen staggers and realizes.This staggers and be expressed as " A staggers " in Fig. 3.Shown linear motion actuator has such structure: the common pivot axis of helical gear A and B (therefore second slit) is positioned on the axis that staggers, and makes rotation axis can extend through second slit.The center line that staggers can be exerted all one's strength in the most weak motive force position and is converted to straight reciprocating motion and almost not loss.
Fig. 3 A shows three positions of the pin that is arranged on the helical gear C in the rotation process of helical gear C; Be original position/end position, centre position and movement position farthest.Shown in Fig. 3 B, clockwise rotate the process from the single of original position at helical gear C, pin spurs movable platen in the stroke from original position to movement position farthest, and is promoting movable platen from movement position farthest in the stroke of end position.At this moment, motive force has the characteristic shown in Fig. 3 B, and presents minimum value in the centre position.
Construct shown in Fig. 3 A, with respect to the direction perpendicular to motor shaft, the position of second slit (center line of movable platen) is set to approach to be positioned at the pin in centre position in drawing process.When pin with respect to perpendicular to the direction of motor shaft away from the position pulling movable platen of the center line (away from reciprocating axis) of movable platen the time, actuating force is divided into vibration-direction and rotation direction; Therefore, the utilization ratio of actuating force descends.But, according to shown in the structure, with respect to the direction perpendicular to motor shaft, the center line of movable platen is set to approach to be positioned at the pin that motive force presents the centre position of minimum value.Like this, can reduce the decline of motive force in the centre position.Compare with it, when pin is positioned at when applying motive force through other centre position of movement position farthest and to movable platen, pin is away from the center line of movable platen; Like this, because loss increases, motive force further reduces.But common such linear motion actuator activates for example load of seat device for opening, and at this moment pin is positioned at maybe and will arrives movement position farthest; Subsequently, return at pin that actuator is not subjected to load in the process of end position.Therefore, descending appears in motive force undoubtedly, but more suitably is that motive force must be greatly diminished.The following structure that reduces motive force greatly of having described with reference to Fig. 4.
Fig. 4 shows the exemplary circuit construct of the linear motion actuator that is used to drive first embodiment shown in Figure 1.Electric current also flows to the negative pole end of DC power supply subsequently by motor by switch SW or sliding contact mechanism from the positive terminal of DC power supply.Sliding contact mechanism is suitable for the turned position of helical gear C is detected the movement position of the moving part that is linear motion actuator.When detecting farthest movement position, sliding contact mechanism inserts motor power circuit with series resistance, can reduce the driving torque (velocity of rotation) of motor thus.
As shown in Figure 2, sliding contact mechanism comprises: be arranged on conductive component on the electric insulation framework with predetermined pattern; Contact (brush) with the conductive component sliding contact; And resistance.It is following and concentric with helical gear C that conductive component is fixed on helical gear C.Contact is on the dorsal part of the helical gear C that the fixed-site that the center of rotation with helical gear C staggers is being rotated.In the single rotation process of helical gear C, contact has experienced single rotation, simultaneously with the upside sliding contact of conductive component.
The conductive pattern that is provided by conductive component is provided Fig. 4.Shown conductive component is divided into the inner region (zone C) and the exterior domain of (insulation) electrically isolated from one, and exterior domain is further divided into the regional A and the area B of heart position (movement position farthest) (insulation) electrically isolated from one therein.Zone A, B and C have the corresponding derivation part of extending from corresponding brush slipper at original position/end position.The end of control line is connected in corresponding end of deriving part.Contact is the combination of interior brush and outer bruss, interior brush and zone C sliding contact, outer bruss and regional A or area B sliding contact.
Switch SW is arranged on the actuating unit outside, and comes ON/OFF by manual operation (manually).Contact position shown in Figure 4 is that start/end is put.At this moment, the interior brush of contact and outer bruss are positioned on the zone C; Therefore zone C and regional A disconnect each other.When switch SW was opened, electric current flowed to negative pole end from positive terminal by motor; Therefore motor rotates.When motor rotated, contact was with the rotation campaign of helical gear C and make zone C and regional A short circuit, formed the motor power circuit that comprises contact thus.Therefore, even when disconnection or off switch, therefore motor also is rotated further by the power supply of sliding contact mechanism.When contact arrived farthest movement position, outer bruss was shifted to area B from regional A, so series resistance is inserted motor power circuit.As shown in Figure 4, two outer bruss length differences.Therefore, though at outer bruss when being positioned at the insulation isolated area of movement position farthest, any of two outer brusses is positioned on the conductive component, makes the power supply of supplying with motor not be interrupted.When contact returned original position shown in Figure 4/end position, area B and zone C electricity each other disconnected, and motor stops.
As mentioned above, according to structure shown in Figure 4, after linear motion actuator drove load, at this moment pin was positioned at maybe and will arrives movement position farthest, and series resistance is inserted motor power circuit, can reduce rotating speed of motor or driving torque thus.
Fig. 5 is the top view according to the total structure of the linear motion actuator of second embodiment of the invention.In the state shown in Fig. 5, removed frame cover.Fig. 6 is the cutaway view along the linear motion actuator of second embodiment shown in Figure 5 that center line intercepted of movable platen.Linear motion actuator comprises motor, reduction gear and has movable platen and the linear reciprocating mechanism of elastomeric element (spring).Motor and the reduction gear that connects with motor are similar to the motor of linear motion actuator of first embodiment and the structure of reduction gear, and it is described with reference to Fig. 1 in front, therefore omit the description of its repetition.
Partly constitute the rotation of the helical gear C of reduction gear,, be converted into the straight reciprocating motion of the movable platen that partly constitutes line reciprocator by at the pin of fixed-site on helical gear C that staggers with the center of helical gear C.The direction of straight reciprocating motion and the parallel axes of motor shaft.Movable platen presents the shape that is similar to letter U, and pulling arm and compression arm are stretched out along equidirectional from base portion and parallel to each other.Movable platen has first slit (elongated hole) and second slit (elongated hole), and first slit and second slit are respectively formed in base portion and the pulling arm.
First slit is arranged so that it vertically and the axis normal of motor shaft, and makes its longitudinal center be positioned at the parallel axes of motor shaft and pass on the straight line at center of final stage gear.Pulling arm and compression arm are positioned on the relative both sides of straight line at the center of passing the final stage gear, make the pulling arm be positioned on axis one side away from motor shaft, are positioned on axis one side of contiguous motor shaft and compress arm.The pin that is arranged on the helical gear C can move in first slit, and sleeve is installed on pin with rotating manner outside slidably.When pin moved in first slit, sleeve rotated, and reduces frictional force thus.The reciprocating axis of movable platen at center that is arranged in the Width of pulling arm is leaving on the direction of motor shaft and the straight line that passes the center of final stage gear stagger (being expressed as " A staggers " at Fig. 5).The center line (reciprocating axis) of movable platen of staggering can reduce the width of actuating unit, and can exert all one's strength in the most weak motive force position and be converted to straight reciprocating motion and almost not loss.
Second slit is arranged to, and to dividing, it vertically and parallel axes of motor shaft by the reciprocating motion axis of the pulling arm of movable platen for its width.Second slit is used to receive the common pivot axis of helical gear A and helical gear B to avoid the interference of rotation axis and movable platen.Movable platen is by following guiding: in framework or frame cover groove is set, movable platen is mounted in this groove, can reciprocating motion be directed from relative both sides in limited mode simultaneously.Second groove is used as along the guiding piece perpendicular to location movable platen on the direction of motor shaft, and is used as the extra guiding piece of movable platen motion.
Therefore, second slit also staggers with the longitudinal center of first slit (therefore staggering with the center of helical gear C) leaving on the direction of motor shaft (therefore in Fig. 5 downwards).The A that staggers between the slit equals staggering between the center of rotation of the center of rotation of helical gear A and B and helical gear C.
Elastomeric element is arranged on the far-end of the compression arm of movable platen, makes an end of elastomeric element be supported by the far-end that compresses arm.The other end of elastomeric element is by for example framework or the frame cover support of transfixion part.Except helical spring shown in Figure 5, hydraulic damper, air cylinder etc. also can be used as elastomeric element.As following detailed, being provided with of elastomeric element can strengthen motive force, and the return movement that can slow down is to reduce noise.By center pulling arm and compression arm are set respectively on relative both sides, can obtain compact design with respect to movable platen.
Utilize above-mentioned structure, the motion in first slit that in the base portion of movable platen, is provided with by pin, the rotation of motor is converted into the straight reciprocating motion of movable platen.The far-end of the pulling arm of reciprocating movable platen has the output block coupling part with reciprocating axis alignment, and output block (control line or bar, not shown) is connected in the output block coupling part.The other end (not shown) of output block is connected in external loading, for example easy seat device for opening.Output block drives external loading along pulling or pushing direction.
Fig. 7 is the view that is used to explain the action of movable platen, and the center line of the pulling arm of movable platen (consistent second slit of locating with center line) is expressed as " A staggers " with helical gear C's (final stage gear) staggering of center of rotation in Fig. 7.Shown linear motion actuator has such structure: the common pivot axis of helical gear A and B (therefore second slit) is positioned on the axis that staggers, and makes rotation axis can extend through second slit.The center line that staggers can be exerted all one's strength in the most weak motive force position and is converted to straight reciprocating motion and almost not loss.
Fig. 7 shows three positions of the pin that is arranged on the helical gear C in the rotation process of helical gear C; Be original position/end position, centre position and movement position farthest.As shown in Figure 8, clockwise rotate the process from the single of original position at helical gear C, pin spurs movable platen the stroke from original position to movement position farthest, and is promoting movable platen from movement position farthest to the stroke of end position.Fig. 8 shows the output characteristic of linear motion actuator.Dotted line is represented the actuating force of motor in Fig. 8, and chain-dotted line is represented the active force of spring; And solid line is represented the power that actuating force and reaction force are produced.In drawing process, the summation of the actuating force of motor and the elastic force that is associated with stretching out of spring in compressive state is applied on the movable platen as the power that is produced.Compare with it, in pushing course, movable platen compression spring; Therefore deducting the masterpiece that elastic force obtains from the actuating force of motor is that the power that is produced is applied on the movable platen.As shown in Figure 8, in pulling with in promoting to move, actuating force presents minimum value in corresponding centre position.
As shown in Figure 7, with respect to the direction perpendicular to motor shaft, the position of second slit (center line of pulling arm) is set to approach to be positioned at the pin in centre position in drawing process.When pin with respect to perpendicular to the direction of motor shaft away from the position pulling movable platen of the center line (away from reciprocating axis) of pulling arm the time, actuating force is divided into vibration-direction and perpendicular to the direction of motor shaft; Therefore, the utilization ratio of actuating force descends.But, according to shown in the structure, with respect to direction perpendicular to motor shaft, the pulling arm center line be set to approach to be positioned at the pin that motive force presents the centre position of minimum value.Like this, can reduce the decline of motive force in the centre position.Compare with it, when pin is positioned at when applying motive force through other centre position of movement position farthest and to movable platen, pin is away from the center line of movable platen; Like this, because loss increases, motive force further reduces.But common such linear motion actuator activates for example load of seat device for opening, and at this moment pin is positioned at maybe and will arrives movement position farthest; Subsequently, return at pin that actuator is not subjected to load in the process of end position.Therefore, descending appears in motive force undoubtedly, but more suitably is that motive force must be greatly diminished.In order to reduce motive force greatly, be provided with helical spring.
Linear motion actuator of the present invention can be configured to, and makes bar be used as output block and promotes to drive external loading to utilize.But, for example be used for by the pulling control line when driving the easy seat device for opening as external loading at linear motion actuator, the mode that helical spring is fitted into actuator is on the direction that spurs external loading along movable platen movable platen to be applied elastic force.This can strengthen motive force and need not to change the rating of electric machine by means of helical spring elastic force.The increase of motive force can reduce load current.In case movable platen is through movement position farthest and enter return movement, movable platen begins compression helical spring.Therefore, return movement slows down, and has reduced noise thus.
Fig. 9 shows the motor load current characteristics in the single reciprocal process of movable platen.As shown in Figure 9, compare with the actuator that does not have spring, the actuator with spring shows lower electric current and shorter pulling operating time.After starting the time initial current peak value occurs, utilize the help of spring can be reduced in peak current in the pulling driving process of movable platen.Equally, the operating time of return movement is prolonged.But through after the movement position farthest, the motor load electric current is used to compress spring at movable platen.
Figure 10 shows the exemplary circuit construct of the linear motion actuator that is used to drive second embodiment shown in Figure 5.Electric current also flows to the negative pole end of DC power supply subsequently by motor by switch SW or sliding contact mechanism from the positive terminal of DC power supply.As shown in Figure 6, sliding contact mechanism comprises: be arranged on conductive component on the electric insulation framework with predetermined pattern; With with the contact (brush) of conductive component sliding contact.It is following and concentric with helical gear C that conductive component is fixed on helical gear C.Contact is on the dorsal part of the helical gear C that the fixed-site that the center of rotation with helical gear C staggers is being rotated.In the single rotation process of helical gear C, contact has experienced single rotation, simultaneously with the upside sliding contact of conductive component.
Conductive component shown in Figure 10 is divided into the inner region (area B) and the exterior domain (regional A) of (insulation) electrically isolated from one.Zone A and B have the corresponding derivation part of extending from corresponding brush slipper at original position/end position.The end of control line is connected in corresponding end of deriving part.Contact is the combination of interior brush and outer bruss, interior brush and area B sliding contact, outer bruss and regional A sliding contact.
Switch SW is arranged on the actuating unit outside, and comes ON/OFF by manual operation (manually).Contact position shown in Figure 10 is that start/end is put.At this moment, the interior brush of contact and outer bruss are positioned on the area B; Therefore area B and exterior domain A disconnect each other.When switch SW was opened, electric current flowed to negative pole end from positive terminal by motor; Therefore motor rotates.When motor rotated, contact was with the rotation campaign of helical gear C and make area B and regional A short circuit, formed the motor power circuit that comprises contact thus.Therefore, even when disconnection and off switch, therefore motor also is rotated further by the power supply of sliding contact mechanism.When contact returned original position shown in Figure 10/end position, area B and regional A electricity each other disconnected, and motor stops.
Therefore, according to the linear motion actuator of second embodiment shown in Figure 5, helical spring increase can strengthen motive force and the return movement that slows down to reduce noise.In addition, because helical spring compression is to be used to the return movement that slows down, just there is no need to use series resistance to come reducing motor.
Although below only describe exemplary embodiments more of the present invention in detail, one of ordinary skill in the art will readily recognize that these exemplary embodiments can have many modification and can substantially not break away from the instruction and the advantage of novelty of the present invention.Therefore, all these modification all are contemplated as falling with in the scope of the present invention.
Claims (13)
1. linear motion actuator comprises:
Motor;
The reduction gear that connects with the motor shaft of motor; With
Linear reciprocating mechanism is used for converting the rotational motion of the final stage gear of reduction gear to straight reciprocating motion;
Wherein, the final stage gear is provided with the pin that staggers with its center of rotation;
Linear reciprocating mechanism comprises movable platen, and movable platen has the slit of preset width and length and allows pin to move in slit; And
The reciprocating axis of movable platen staggers with the straight line that passes the center of final stage gear.
2. according to the linear motion actuator of claim 1, wherein reduction gear have the worm screw of being fixed in motor shaft and with the worm gear of worm engaging, and
Movable platen has another slit, and to dividing, and described another slit receives the rotation axis of worm gear to avoid the interference of rotation axis and movable platen to the width of described another slit by the reciprocating axis of movable platen.
3. according to the linear motion actuator of claim 2, wherein on the coaxial rotation axis that is arranged on worm gear of helical gear, and
Final stage gear and helical gear engagement.
4. according to the linear motion actuator of claim 3, wherein connect the end that loaded output block coupling part is arranged on movable platen, with the reciprocating axis alignment of movable platen.
5. according to the linear motion actuator of claim 3, the pin that wherein is arranged on the final stage gear has sleeve outside mounted thereto.
6. according to the linear motion actuator of claim 3, also comprise the position detecting mechanism of the position that is used to detect moving part,
Wherein rotating speed of motor or driving torque change according to the position of the moving part that is detected.
7. according to the linear motion actuator of claim 6, wherein position detecting mechanism detects the turned position of final stage gear.
8. according to the linear motion actuator of claim 1, wherein be provided with elastomeric element and act on movable platen.
9. linear motion actuator according to Claim 8, wherein elastomeric element is a helical spring, it increases the motive force of movable platen and be used as load in the promotion motion process of movable platen in the pulling motion process of movable platen.
10. according to the linear motion actuator of claim 9, wherein reduction gear have the worm screw of being fixed in motor shaft and with the worm gear of worm engaging, and
The first arm of movable platen has another slit, and to dividing, and described another slit receives the rotation axis of worm gear to avoid the interference of rotation axis and movable platen to the width of described another slit by the reciprocating axis of movable platen.
11. according to the linear motion actuator of claim 10, wherein on the coaxial rotation axis that is arranged on worm gear of helical gear, and
Final stage gear and helical gear engagement.
12. according to the linear motion actuator of claim 11, wherein connect the end that loaded output block coupling part is arranged on the first arm, with the reciprocating axis alignment of movable platen.
13. according to the linear motion actuator of claim 12, also comprise sliding contact mechanism, it is single reciprocal to be used for making when opening switch movable platen to carry out,
Wherein sliding contact mechanism comprises: be arranged on conductive component on the electric insulation framework with predetermined pattern; With with the contact of conductive component sliding contact,
Conductive component is fixed under the final stage gear and is concentric with the final stage gear, contact on the dorsal part of the final stage gear that the fixed-site that the center of rotation with the final stage gear staggers is being rotated, and
In the single rotation process of final stage gear, contact experience single rotation and with the upside sliding contact of conductive component.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2007271974A JP2009100610A (en) | 2007-10-19 | 2007-10-19 | Rectilinear-motion actuator |
| JP2007271974 | 2007-10-19 | ||
| JP2008016208 | 2008-01-28 |
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| CN101414770A true CN101414770A (en) | 2009-04-22 |
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| CNA200810149944XA Pending CN101414770A (en) | 2007-10-19 | 2008-10-17 | Rectilinear-motion actuator |
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| CN103490552A (en) * | 2012-06-12 | 2014-01-01 | 科基纳提克斯股份有限公司 | Adjusting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9757547B2 (en) * | 2013-05-03 | 2017-09-12 | Park City Bio, LLC | Lysine delivery systems for blood coagulation |
-
2007
- 2007-10-19 JP JP2007271974A patent/JP2009100610A/en active Pending
-
2008
- 2008-10-17 CN CNA200810149944XA patent/CN101414770A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102440714A (en) * | 2011-07-20 | 2012-05-09 | 王湘冀 | Device for slowing fall of toilet cover plate |
| CN103490552A (en) * | 2012-06-12 | 2014-01-01 | 科基纳提克斯股份有限公司 | Adjusting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009100610A (en) | 2009-05-07 |
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