CN1927627A - Motorized retractor - Google Patents

Motorized retractor Download PDF

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Publication number
CN1927627A
CN1927627A CN 200610151351 CN200610151351A CN1927627A CN 1927627 A CN1927627 A CN 1927627A CN 200610151351 CN200610151351 CN 200610151351 CN 200610151351 A CN200610151351 A CN 200610151351A CN 1927627 A CN1927627 A CN 1927627A
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China
Prior art keywords
spool
output shaft
ratchet
rotation
driven wheel
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CN 200610151351
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Chinese (zh)
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CN100469623C (en
Inventor
森信二
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Tokai Rika Co Ltd
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Tokai Rika Co Ltd
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Abstract

In a motorized retractor, due to an ECU and a driver switching a speed of rotation of an output shaft of a motor to a first speed or a second speed, a transfer path of rotational force from the motor to a spool is switched to a first driving force transferring section (a path through a meshing clutch and a slip mechanism) or a second driving force transferring section (a path through an overload mechanism and a centrifugal clutch). Accordingly, there is no need for a complex switching mechanism including a solenoid which is employed in conventional motorized retractors. A device can thereby be made more compact.

Description

Motorized retractor
Technical field
The present invention relates to a kind of Motorized retractor, this Motorized retractor is applied in the seat safety belt apparatus that is used for retraining by ribbon the health of the automotive occupant that is sitting in seats such as vehicle, and this Motorized retractor described ribbon of can reeling, thereby make this ribbon to be drawn out.
Background technology
Seat safety belt apparatus is installed in such as in the vehicles such as passenger vehicle, and this chair mounted band retrains the automotive occupant that is sitting in the seat by the ribbon of elongated, belt-shaped.In these seat safety belt apparatus, so-called three-point seat belt device is provided with taking-up device (Webbing retractor), makes this ribbon to be drawn out thereby hold this belt under this taking-up device state that ribbon is reeled therein.
This taking-up device has: spool, the proximal lateral of ribbon longitudinal direction are anchored at this spool place, and this spool is by rotating the described ribbon of reeling from this proximal lateral; And such as the push mechanism of coil spring etc., this push mechanism promotes spool along the direction of coiling ribbon.In being provided with the seat safety belt apparatus of this taking-up device, when ribbon was put on automotive occupant, the propelling thrust by push mechanism promoted spool along the direction of coiling ribbon.Be eliminated lax ribbon and retrained automotive occupant therefrom.In addition, when automotive occupant was cancelled ribbon wherein and is applied to state on him, ribbon was wound up on the spool by the propelling thrust of push mechanism.
At this moment, if the propelling thrust of push mechanism is less, then ribbon is under the relaxed state of not reeled fully, and this can cause degraded appearance when ribbon is not used.On the other hand, if the propelling thrust of push mechanism is bigger, then can bring girdle sensation to the occupant who is applied with ribbon on it.
Therefore, for the propelling thrust that reduces push mechanism and alleviate the girdle sensation that (inhibition) brings automotive occupant, and for reducing of the power on the spool that ribbon is wound up into that compensates that reduction owing to this propelling thrust causes, visualized a kind of Motorized retractor (automatic seat Webbing retractor), this Motorized retractor has by the mechanism of the drive force spool of motor (so-called " coiling auxiliary mechanism ").
In the Motorized retractor that is equipped with this coiling auxiliary mechanism, consider the traveling comfort of automotive occupant etc., preferably, the spool coiling torque that will be produced by the propulsive effort of motor is arranged to be low to moderate the degree of the propelling thrust of compensation push mechanism.For this reason, between the output shaft of motor and spool, be provided with reduction ratio and be set as lower speed reduction gearing.
On the other hand, propelling thrust reduction when push mechanism, thereby when alleviating the above-mentioned girdle sensation that brings automotive occupant, produce and be called becoming flexible on a small quantity of " relax " being in its ribbon place that applies state, and this can cause ribbon restraint performance variation when vehicle collision etc.
Therefore, visualized a kind of Motorized retractor that is equipped with such mechanism (so-called " pre-stretching device "), this mechanism forces to make spool to rotate the restraint performance that improves ribbon along coiling direction by the propulsive effort of motor when sensing collision risk.
In being equipped with the Motorized retractor of this pre-stretching device, must making ribbon overcome unexpected deceleration owing to vehicle and begin to force to reel towards the force of inertia of the automotive occupant of vehicle front motion.Therefore, the coiling torque of the spool that must be produced by the propulsive effort of motor is provided with higherly.Therefore, between the output shaft of motor and spool, be provided with reduction ratio and be configured to higher speed reduction gearing.
In addition, known a kind of Motorized retractor, this Motorized retractor provides above-mentioned coiling auxiliary mechanism and pre-stretching device (for example, referring to Japanese Patent Application Laid-Open (JP-A) No.2001-63522 communique) by single motor.
In the disclosed Motorized retractor, be provided with two different speed reduction gearings between output shaft and spool in (JP-A) No.2001-63522 communique, these two speed reduction gearings can be delivered to spool with the turning effort of motor output shaft.These speed reduction gearings are configured to different reduction ratios.When comprising solenoidal switching construction and switch to one of them speed reduction gearing in these speed reduction gearings, pass through the speed reduction gearing that switched to the turning effort of output shaft is passed on the spool.
Therefore, when switching to reduction ratio and be configured to lower speed reduction gearing, spool at full speed low torque rotates.When switching to reduction ratio and be configured to higher speed reduction gearing, spool rotates with the low velocity high torque (HT).Like this, by single motor can realize reeling auxiliary mechanism and the pre-required conflicting performance of stretching device.
Yet, in the Motorized retractor of said structure,, therefore must guarantee to be used to place solenoidal space because switching mechanism is to comprise solenoidal labyrinth as mentioned above, this causes device to become big.
Summary of the invention
In view of the above, the invention provides a kind of Motorized retractor, this Motorized retractor can be realized coiling auxiliary mechanism and the pre-required conflicting performance of stretching device by single motor, and does not need switching mechanism, thereby can make device compact more.
Motorized retractor about the first aspect invention has: spool, and the ribbon that the constraint automotive occupant is used is wrapped on this spool, thus this ribbon can be reeled on this spool and can be pulled out from this spool; Motor; Control part, this control part can switch to the rotating speed of the output shaft of described motor few two ranks, and these two ranks are first speed and than this first fireballing second speed; The first propulsive effort transmitting portions, this first propulsive effort transmitting portions is located between described spool and the described output shaft, and be delivered to described spool than the rotation of the output shaft that reduces by first speed that is in and with this rotation, thereby this spool is rotated along coiling direction with preset deceleration; And the second propulsive effort transmitting portions, this second propulsive effort transmitting portions is located between described spool and the described output shaft with being independent of the described first propulsive effort transmitting portions, and reduce the rotation of the described output shaft that is in described second speed with the reduction ratio of the described preset deceleration ratio that is higher than the described first propulsive effort transmitting portions, and this rotation is delivered to described spool, thereby this spool is rotated along coiling direction.
The described Motorized retractor of first aspect has described motor, and the described first propulsive effort transmitting portions and the described second propulsive effort transmitting portions that the turning effort of the output shaft of this motor are delivered to described spool.The turning effort of the output shaft of described motor can be delivered to described spool by two different bang paths.
That is, when the described output shaft that makes described motor when described control part rotated with described first speed, this rotation reduced by the described first propulsive effort transmitting portions and is passed to described spool.This spool is rotated along coiling direction.On the contrary, when the described output shaft that makes described motor when control part rotated with the described second speed bigger than described first speed, this rotation reduced by the described second propulsive effort transmitting portions and is passed to described spool.This spool is rotated along described coiling direction.
In addition, in this case, the reduction ratio of the described second propulsive effort transmitting portions is set as the reduction ratio that is higher than the described first propulsive effort transmitting portions.When described spool by the described second propulsive effort transmitting portions when described coiling direction rotates, this spool rotates with the low velocity high torque (HT).On the contrary, when described spool by the described first propulsive effort transmitting portions when described coiling direction rotates, this spool at full speed low torque rotates.
Therefore, usually such as when the applying of automotive occupant release ribbon etc., if described control part makes the described output shaft of described motor rotate with described first speed, then described spool by the described first propulsive effort transmitting portions at full speed low torque rotate along described coiling direction, thereby ribbon is wound up on this spool.Like this, even for example push mechanism reduces along the propelling thrust that described coiling direction promotes described spool therein, thereby under the situation that the girdle sensation of automotive occupant reduces when applying described ribbon, described propulsive effort compensation that also can be by described motor is wound up into power on the described spool because the minimizing that the reduction of this propelling thrust causes with described ribbon, thereby can make ribbon be wound up on the spool fully and be received (so-called " coiling auxiliary mechanism ").
On the other hand, for example, ribbon applies state following time when sensing vehicle collision danger etc. when being in, if described control part makes the described output shaft of described motor rotate with described second speed, then described spool rotates along described coiling direction with the low velocity high torque (HT) by the described second propulsive effort transmitting portions.Like this, can force described ribbon is wound up on the described spool.Therefore, eliminate the slight absent-mindedness (so-called " relaxing ") of the ribbon that is under the state of applying, thereby can improve the power (so-called " pre-stretching device ") of the constraint automotive occupant that produces by described ribbon.
Like this, in the described Motorized retractor of first aspect, can realize coiling auxiliary mechanism and the pre-desired conflicting performance of stretching device by single motor.
In addition, in the described Motorized retractor of above-mentioned first aspect, because described control part switches to described first speed or described second speed with the described rotating speed of the described output shaft of described motor, therefore make the described bang path of turning effort switch to described first propulsive effort transmitting portions or the described second propulsive effort transmitting portions from described motor to described spool.Therefore, do not need to be included in the solenoidal complicated switching mechanism that adopts in the conventional electric taking-up device, thereby can make described device compact more.
In Motorized retractor about the second aspect invention, in the described Motorized retractor of first aspect, described control part always makes output shaft rotate along a direction when driving described motor, and described output shaft with described first speed when described direction is rotated, the described first propulsive effort transmitting portions is delivered to described spool with the described rotation of described output shaft, and described output shaft with described second speed when described direction is rotated, the described second propulsive effort transmitting portions is delivered to described spool with the described rotation of described output shaft.
In the described Motorized retractor of second aspect, the described output shaft that makes described motor when described control part is when a direction is rotated with described first speed, this rotation is delivered to described spool by the described first propulsive effort transmitting portions, and this spool is rotated along described coiling direction.On the other hand, the described output shaft that makes described motor when described control part is when a direction is rotated with described second speed, and this rotation is delivered to described spool by the described second propulsive effort transmitting portions, and described spool is rotated along described coiling direction.
Like this, described control part always makes the described output shaft of described motor rotate along a described direction, but switch to described first speed or described second speed by the described rotating speed with this output shaft, the described bang path of described turning effort that will be from described motor to described spool switches to described first propulsive effort transmitting portions or the described second propulsive effort transmitting portions.Therefore, can simplify by of the control of described control part the described driving of described motor.
In Motorized retractor about third aspect invention, first or the described Motorized retractor of second aspect in, the described first propulsive effort transmitting portions has: first clutch, when the described output shaft of described motor rotates, this first clutch connects described spool and described output shaft, and makes and can rotate transmission between this spool and described output shaft; And first free-wheeling mechanism, when the described spool in the coupled condition that is in described first clutch applies torque more than or equal to first setting value, described first free-wheeling mechanism cuts off rotation transmission between described spool and the described output shaft by this torque, thereby this spool can be dallied relatively with described output shaft.
In the described Motorized retractor of the third aspect, when described control part made the described output shaft of described motor rotate with described first speed, described first clutch connected described spool and described output shaft.Like this, described output shaft is passed to described spool with the described rotation of this first speed, thereby this spool is rotated along described coiling direction.
Described therein spool and described output shaft are by under the above-mentioned state of described first clutch bonded assembly (described ribbon is wound on the state on the described spool), when (for example applying to this spool more than or equal to the torque of described first setting value, when foreign matter hangs on the ribbon, or the like) time, described first free-wheeling mechanism cuts off rotation transmission between described spool and the described output shaft by this torque, thereby the two can be dallied relatively.Like this, can prevent that described ribbon is forced to be wound up on the described spool under the state of this ribbon and foreign matter interference.
In Motorized retractor about the fourth aspect invention, in the described Motorized retractor of the described third aspect, described first clutch is to have the engaged clutch of forward rotation with ratchet, described forward rotation is delivered to this forward rotation with ratchet by described output shaft and rotates with the rotation of ratchet, and when described output shaft forward rotation, this forward rotation is delivered to described spool by directly or indirectly meshing with described spool with the forward rotation of described output shaft with ratchet, when described output shaft stops or during backward rotation, described forward rotation is cancelled with the engagement of ratchet; And described first free-wheeling mechanism is the slide mechanism with first slide unit, described first slide unit rotates by the rotation that described output shaft is delivered to this first slide unit, this first slide unit is connected to described spool directly or indirectly by friction force, and this spool can be rotated, and when the torque that applies to described spool more than or equal to described first setting value, this first slide unit overcomes described friction force and slides with respect to described spool.
In the described Motorized retractor of fourth aspect, when the described output shaft forward rotation of described motor, the forward rotation of described engaged clutch with ratchet directly or indirectly with described spool engagement.Like this, the described rotation of described output shaft is passed to this spool, this spool is rotated along described coiling direction, thereby described ribbon is wound up on the described spool.
In addition, described therein ribbon is wound under the state on the described spool like this, when for example described ribbon hangs on the foreign matter, thereby when described spool applies torque more than or equal to described first setting value, the passing through that friction force overcomes this friction force with respect to described spool bonded assembly first slide unit directly or indirectly of described slide mechanism and sliding with respect to this spool.Like this, the described rotation transmission between described spool and the described output shaft is cut off, and described spool is relative with described output shaft to dally thereby make.
On the other hand, stop or during backward rotation, the forward rotation of described engaged clutch is cancelled with ratchet and described spool ingear state, cancels the described rotation transmission from described output shaft to described spool thus when the output shaft of described motor.
In Motorized retractor about invention aspect the 5th, in the Motorized retractor of fourth aspect, when described output shaft stops, the forward rotation of described engaged clutch is cancelled with the engagement of ratchet, and described engaged clutch has the backward rotation ratchet, this backward rotation with ratchet by when the described output shaft backward rotation directly or indirectly with described spool engagement, the backward rotation of described output shaft is delivered to described spool, and this spool is rotated along pull-out direction, and this backward rotation is cancelled with the engagement of ratchet when described output shaft stops.
Aspect the 5th in the described Motorized retractor, when the described output shaft backward rotation of described motor, because the backward rotation of described engaged clutch directly or indirectly meshes with ratchet and described spool, therefore the described rotation of described output shaft is passed to described spool, thereby this spool is rotated along described pull-out direction.Therefore, if for example when described automotive occupant begins to pull out the described ribbon that is contained in this Motorized retractor, the described output shaft backward rotation of described motor, then auxiliary the described of described ribbon pulled out, thereby automotive occupant can be pulled out ribbon (so-called " pulling out auxiliary mechanism ") with slight power.In addition, when the described output shaft of described motor stopped, described backward rotation was cancelled with the state that ratchet and described spool mesh together.
In Motorized retractor about invention aspect the 6th, in the described Motorized retractor of fourth aspect, described engaged clutch has: driven wheel, it is connected on the described output shaft of described motor, and rotate, and support described forward rotation ratchet rotationally by the rotation that described output shaft is delivered to this driven wheel; Ratchet, it is supported for and can freely rotates with respect to described driven wheel, and is connected to described first slide unit; And friction spring, it engages directly or indirectly with the framework that supports described spool, this friction spring is connected to described forward rotation ratchet, described driven wheel with the forward rotation of described output shaft when direction is rotated, this friction spring makes described forward rotation ratchet and described ratchet engaged, and described driven wheel with described output shaft stop or backward rotation stops or when another direction was rotated, this friction spring made described forward rotation separate with described ratchet with ratchet; And described slide mechanism has drum, and this drum is supported for respect to described ratchet and freely rotates, and is connected on the described spool, and this drum can rotate described spool, and keeps described first slide unit by friction force.
In the Motorized retractor aspect the described the 6th, when the described output shaft forward rotation of described motor, the described driven wheel that is connected on the described output shaft rotates along a direction.When described driven wheel when direction is rotated, the described friction spring that engages with the described framework that supports described spool makes described forward rotation usefulness ratchet and the described ratchet engaged that is supported on this driven wheel place.Like this, described driven wheel is connected with described ratchet, thereby this ratchet is rotated.The described rotation of this ratchet is delivered to described drum by described first slide unit, thereby drum is rotated.Because described drum is connected on the described spool, so this spool rotates along described coiling direction by described drum.Like this, described ribbon is wound up on the described spool.
In addition, described therein ribbon is wound under the state on the described spool like this, when for example described ribbon hangs on the foreign matter, thereby when described spool applied torque more than or equal to described first setting value, described first slide unit that remains on described drum place by friction force overcame this friction force and slides with respect to described drum.Cut off the described rotation transmission between described drum (described spool) and the described ratchet thus, thus the two relative idle running.Like this, can prevent that this ribbon is forced to be wound up on the described spool under the state that described therein ribbon and foreign matter interfere.
In addition, when described driven wheel with the output shaft of described motor stop or backward rotation stops or when described another direction was rotated, the described friction spring that engages with described framework made the described forward rotation usefulness ratchet that is supported on described driven wheel place separate with described ratchet.Like this, use ratchet and the bonded assembly state by described forward rotation with regard to having cancelled wherein said driven wheel and described ratchet, thus the described rotation transmission of cancellation from described output shaft to described spool.
Aspect this, a gear can be set between the output shaft of described driven wheel and described motor, thereby the rotation of this output shaft is delivered to this driven wheel.
In Motorized retractor about invention aspect the 7th, aspect the 5th in the described Motorized retractor, described engaged clutch has: driven wheel, it is connected on the described output shaft of described motor, and rotate, and support described forward rotation rotationally with ratchet and described backward rotation ratchet by the rotation that described output shaft is delivered to this driven wheel; Ratchet, it is supported for and can freely rotates with respect to described driven wheel, and is connected on described first slide unit; And inertia member, it is supported for and can rotates with respect to described driven wheel, and remain on predetermined center position place with respect to described driven wheel by being applied to propelling thrust on this inertia member, described driven wheel with the forward rotation of described output shaft when direction is rotated, described inertia member relatively rotates along other direction with respect to described driven wheel by overcoming described propelling thrust, make described forward rotation ratchet and described ratchet engaged, and described driven wheel with the backward rotation of described output shaft when another direction is rotated, described inertia member relatively rotates along a direction with respect to described driven wheel by overcoming described propelling thrust, makes described backward rotation ratchet and described ratchet engaged; And described slide mechanism has drum, and this drum is supported for respect to described ratchet and freely rotates, and is connected on the described spool, and this drum can rotate described spool, and keeps described first slide unit by described friction force.
Aspect the 7th in the described Motorized retractor, when the described output shaft forward rotation of described motor, the described driven wheel that is connected on this output shaft rotates along a direction.When described driven wheel when direction is rotated, described inertia member overcomes described propelling thrust and rotates with respect to described driven wheel along another direction, and makes described forward rotation usefulness ratchet and described ratchet engaged.Like this, described driven wheel is connected with described ratchet, thereby this ratchet is rotated.The rotation of described ratchet is delivered to described drum by described first slide unit, thereby makes this drum rotate.Because this drum is connected on the described spool, this spool is rotated along described coiling direction by described drum.In addition, when the described output shaft of described motor stopped, described inertia member remained on described center position place by described propelling thrust, thereby cancelled described forward rotation ratchet and described ratchet engaged state together.
On the other hand, when the described output shaft backward rotation of described motor, the described driven wheel that is connected on this output shaft rotates along described another direction.When this driven wheel when described another direction is rotated, described inertia member overcomes described propelling thrust and rotates with respect to described driven wheel along a direction, and makes described backward rotation usefulness ratchet and described ratchet engaged.Like this, described driven wheel is connected with described ratchet, thereby this ratchet is rotated.The described rotation of described ratchet is delivered to described drum by described first slide unit, thereby this drum is rotated.Because this drum is connected on the described spool, make that therefore this spool rotates along described pull-out direction by described drum.In addition, when the described output shaft of described motor stopped, described inertia member remained on described center position place by described propelling thrust, thereby had cancelled described backward rotation ratchet and described ratchet engaged state together.
In addition, for example the described turning effort of described output shaft is delivered to described spool by described driven wheel, described forward rotation with ratchet, described ratchet, described first slide unit and described drum therein, and this spool is along under the state of the coiling direction rotation of described ribbon, when described ribbon hangs on the foreign matter, thereby when described spool applied torque more than or equal to described first setting value, described first slide unit that remains on described drum place by friction force overcame described friction force and slides with respect to described drum.Cut off the described rotation transmission between described drum (described spool) and the described ratchet thus, thereby make the two relative idle running.Like this, can prevent that described ribbon is forced to be wound up on the described spool under the state that described therein ribbon and foreign matter interfere.
In Motorized retractor about the eight aspect invention, in the described Motorized retractor of either side in aspect first to the 7th, the described second propulsive effort transmitting portions all has second clutch, when the described output shaft of described motor rotates with described second speed, this second clutch connects described spool and described output shaft, thereby can carry out the rotation transmission between this spool and this output shaft.
In the described Motorized retractor of eight aspect, when described control part made the described output shaft of described motor rotate with described second speed, described second clutch connected described spool and described output shaft.Like this, the described rotation that is in the described output shaft of described second speed is passed to described spool, thereby this spool is rotated along described coiling direction.
In Motorized retractor about invention aspect the 9th, in the described Motorized retractor of eight aspect, described second clutch is the centrifugal clutch with counterweight, described counterweight is rotated by the rotation that described output shaft is delivered to this counterweight, and when this output shaft when rotating more than or equal to the speed of described second speed, described counterweight is owing to the centnifugal force that is applied on this counterweight moves, and engage with described spool directly or indirectly, thereby connect described output shaft and described spool, and stop or when rotating less than the speed of described second speed, the engagement state of described counterweight and described spool is cancelled when described output shaft.
Aspect the 9th in the described Motorized retractor, when the described output shaft of described motor when rotating more than or equal to the speed of described second speed, the described counterweight of described centrifugal clutch is moved by the centnifugal force that is applied on this counterweight, and engage with described spool directly or indirectly, thereby connect described output shaft and this spool.Like this, the described rotation of this output shaft is passed to this spool, makes this spool rotate along described coiling direction, thereby described ribbon is wound up on the described spool.
In Motorized retractor about invention aspect the tenth, in aspect first to the 9th in the described Motorized retractor of either side, the described second propulsive effort transmitting portions has second free-wheeling mechanism, when the rotation of described output shaft therein just is being passed under the state of described spool when this spool applies torque more than or equal to second setting value, this second free-wheeling mechanism cuts off rotation transmission between described spool and the described output shaft by this torque, thereby this spool can be dallied relatively with this output shaft.
Aspect the tenth in the described Motorized retractor, for example be delivered to described spool and make this spool therein along under the state of described coiling direction rotation by the described turning effort of the described second propulsive effort transmitting portions with described output shaft, when the torque that applies to described spool more than or equal to described second setting value (for example, when eliminating so-called " relaxing ", the health of automotive occupant becomes " obstacle " and ribbon can not further reel basically etc. the time again), described second free-wheeling mechanism cuts off described rotation transmission between described spool and the described output shaft by this torque, thereby the two can be dallied relatively.Like this, can prevent the described propulsive effort of described spool by described motor rotating along described coiling direction, thereby can prevent that described ribbon is by tightly fettering the health of described automotive occupant greater than required power greater than required power.
In about the tenth Motorized retractor of inventing on the one hand, aspect the tenth in the described Motorized retractor, described second free-wheeling mechanism is the overload mechanism with second slide unit, described second slide unit rotates by the rotation that described output shaft is delivered to this second slide unit, and pass through friction force directly or indirectly with respect to described spool connection, thereby described spool can be rotated, and when the torque that applies to described spool more than or equal to described second setting value, described second slide unit overcomes described friction force and slides with respect to described spool.
In the described Motorized retractor of the tenth one side, for example be delivered to described spool and make this spool therein along under the state of described coiling direction rotation by the turning effort of the described second propulsive effort transmitting portions with described output shaft, when the torque that applies to described spool more than or equal to described second setting value (for example, when eliminating so-called " relaxing ", the health of automotive occupant becomes " obstacle " and ribbon can not further reel basically etc. the time again), described second slide unit that is connected to the described overload mechanism on the described spool directly or indirectly by friction force overcomes this friction force and slides with respect to described spool.Cut off the rotation transmission between described spool and the described output shaft thus, described spool is relative with described output shaft to dally thereby make.Like this, can prevent described spool by the described propulsive effort of described motor and rotating along described coiling direction, and can prevent that described ribbon is by tightly fettering the health of described automotive occupant greater than required power greater than required power.
In Motorized retractor about invention aspect the 12, in aspect first to the 7th in the described Motorized retractor of either side, the described second propulsive effort transmitting portions has: second clutch, when the described output shaft of described motor rotates with described second speed, this second clutch connects described spool and described output shaft, thereby makes and can rotate transmission between described spool and described output shaft; And second free-wheeling mechanism, when under the coupled condition at described second clutch when described spool applies torque more than or equal to second setting value, this second free-wheeling mechanism cuts off rotation transmission between described spool and the described output shaft by described torque, thereby described spool can be dallied relatively with described output shaft, and described second clutch is the centrifugal clutch with counterweight, described counterweight is rotated by the rotation that described output shaft is delivered to this counterweight, and when described output shaft when rotating more than or equal to the speed of described second speed, described counterweight is owing to the centnifugal force that is applied on it moves, and engage with described spool directly or indirectly, thereby connect described output shaft and described spool, and stop or when rotating less than the speed of described second speed, the engagement state of described counterweight and described spool is cancelled when described output shaft; And described second free-wheeling mechanism is the overload mechanism with second slide unit, described second slide unit rotates by the rotation that output shaft is delivered to this second slide unit, and pass through friction force directly or indirectly with respect to described spool connection, thereby this spool can be rotated, and when the torque that applies to described spool more than or equal to described second setting value, described second slide unit overcomes described friction force and slides with respect to described spool; And described overload mechanism has: intermediate gear, and it is connected to the described output shaft of described motor, and rotates by the rotation that described output shaft is delivered to this intermediate gear, and described second slide unit anchors on this intermediate gear; And adapter, it is supported for and can rotates with respect to described intermediate gear, and keeps described second slide unit by described friction force; And described centrifugal clutch has: rotor, and it is connected on the described adapter, thereby this adapter can be rotated, and supports described counterweight and make this counterweight radially to move; Push mechanism, its inboard towards the radial direction of described rotor promotes described counterweight; And gear, it is supported for respect to described rotor and described counterweight and freely rotates, and be connected to described spool, thereby this spool can be rotated, and when described rotor owing to described output shaft when rotating more than or equal to the rotation of the speed of described second speed, described gear since described counterweight overcome the propelling thrust of described push mechanism and be connected to described rotor towards the movement outside of the radial direction of described rotor by this counterweight by centnifugal force.
Aspect the 12 in the described Motorized retractor, when the described output shaft of described motor when rotating more than or equal to the speed of described second speed, the described intermediate gear that is connected to described output shaft rotates.This rotation of described intermediate gear is delivered to described adapter by described second slide unit, thereby this adapter rotates, and makes the described rotor rotation that is connected on this adapter.Therefore, can apply centnifugal force with respect to the described counterweight that described rotor moves along described radial direction to being supported for, thus make this counterweight overcome described push mechanism propelling thrust and towards the movement outside of the described radial direction of described rotor.When making described counterweight, be supported for the described gear that freely rotates with respect to described rotor and described counterweight and be connected to described rotor by this counterweight towards the movement outside of the described radial direction of described rotor.Therefore, the described rotation of described rotor is passed to described gear, thereby this gear rotates.Because this gear is connected on the described spool, this spool is rotated along described coiling direction by this gear, thereby described ribbon is wound up on the described spool.
In addition, therein for example by described intermediate gear, described second slide unit, described adapter, described rotor, thereby described counterweight and described gear are delivered to described spool with the described turning effort of described output shaft and make under the state that this spool rotates along described coiling direction, when the torque that applies to described spool more than or equal to described second setting value (for example, when eliminating so-called " relaxing ", the health of automotive occupant becomes " obstacle " and described ribbon can not further reel basically the time again etc.), slide with respect to this adapter with respect to maintained described second slide unit of described adapter by friction force.Cut off the rotation transmission between described intermediate gear (described output shaft) and the described adapter thus, thereby make the two relative idle running.Like this, can prevent to be connected to the described spool of described adapter, described counterweight and the described gear described propulsive effort by described motor rotating along described coiling direction, and can prevent that described ribbon is by tightly fettering the health of described automotive occupant greater than required power greater than required power by described rotor.
On the other hand, when described output shaft stops or when rotating less than the speed of described second speed, the described counterweight of described centrifugal clutch by the described propelling thrust of described push mechanism towards the interior lateral movement of the described radial direction of described rotor, thereby cancelled described rotor and described gear by described counterweight the bonded assembly state.Like this, cancelled described rotation transmission from described output shaft to the described spool that is connected to described gear.
As mentioned above, according to Motorized retractor of the present invention, can realize coiling auxiliary mechanism and the pre-required conflicting performance of stretching device by single motor, and not need switching mechanism, thereby can make described device compact more.
Description of drawings
Describe embodiments of the invention with reference to the accompanying drawings in detail, in these accompanying drawings:
Fig. 1 is the integrally-built front schematic view that illustrates about the Motorized retractor of first embodiment of the invention;
Fig. 2 is the integrally-built exploded perspective view that illustrates about the Motorized retractor of first embodiment of the invention;
Fig. 3 is the sectional view that illustrates about the structure of the main portion of the Motorized retractor of first embodiment of the invention;
Fig. 4 is the exploded perspective view that illustrates about the structure of the main portion of the Motorized retractor of first embodiment of the invention;
Fig. 5 is that the line 5-5 along Fig. 3 cuts open the cutaway view of getting, and the structure about the first propulsive effort transmitting portions of the Motorized retractor of first embodiment of the invention is shown;
Fig. 6 is the expansion drawing that illustrates about the structure of the first propulsive effort transmitting portions of the Motorized retractor of first embodiment of the invention;
Fig. 7 is that the line 7-7 along Fig. 3 cuts open the cutaway view of getting, and the structure about the second propulsive effort transmitting portions of the Motorized retractor of first embodiment of the invention is shown;
Fig. 8 is the expansion drawing that illustrates about the structure of the second propulsive effort transmitting portions of the Motorized retractor of first embodiment of the invention;
Fig. 9 is the expansion drawing that illustrates about the structure of the first propulsive effort transmitting portions of the Motorized retractor of second embodiment of the invention;
Figure 10 is the exploded perspective view that illustrates about the structure of the main portion of the Motorized retractor of third embodiment of the invention;
Figure 11 is the cutaway view that illustrates about the structure of the first propulsive effort transmitting portions of the Motorized retractor of third embodiment of the invention;
Figure 12 is the exploded perspective view that illustrates about the structure of the engaged clutch of the Motorized retractor of third embodiment of the invention and slide mechanism;
Figure 13 is the exploded perspective view that illustrates about the structure of the engaged clutch of the Motorized retractor of third embodiment of the invention and slide mechanism;
Figure 14 is the planar view that illustrates about the structure of the engaged clutch of the Motorized retractor of third embodiment of the invention, and the state that inertia member wherein is positioned at center position is shown;
Figure 15 is the planar view that illustrates about the structure of the engaged clutch of the Motorized retractor of third embodiment of the invention, and illustrate forward rotation wherein with ratchet by inertia member and with the state of ratchet engaged; And
Figure 16 is the planar view that illustrates about the structure of the engaged clutch of the Motorized retractor of third embodiment of the invention, and illustrate backward rotation wherein with ratchet by inertia member and with the state of ratchet engaged.
The specific embodiment
＜the first embodiment 〉
In Fig. 1, show integrally-built overview about the Motorized retractor 10 of first embodiment of the invention with front elevation.And, in Fig. 2, illustrate the integrally-built overview of Motorized retractor 10 with exploded perspective.In Fig. 3, show the structure of the main portion of Motorized retractor 10, and in Fig. 4, illustrate the structure of the main portion of Motorized retractor 10 with exploded perspective with cutaway view.
As shown in Figure 1, Motorized retractor 10 is provided with framework 12.Framework 12 has roughly tabular back plate 14.Because back plate 14 is fixed on the car body by unshowned fastener (for example, bolt etc.), so Motorized retractor 10 is fixed on the car body.A pair of pin sheet (leg piece) 16,18 is configured in parallel with each other from the end extension of two horizontal directions of plate 14 afterwards.Between pin sheet 16,18, be furnished with the spool of making by die casting etc. 20 rotationally.
The close end that forms the ribbon 28 of elongated belt shape is fixed on the spool 20.Rotate along a direction when spool 20 centers on its axis (below, this direction is called " coiling direction ") time, ribbon 28 is wound up on the peripheral part of spool 20 from its proximal lateral stratification.In addition, if spur this ribbon 28 from the distal side of ribbon 28, this ribbon 28 that then is wound up on spool 20 peripheral parts is drawn out, simultaneously the direction of the direction of rotation of spool 20 along with coiling ribbon 28 time is rotated (below, will be when pulling out ribbon 28 rotation direction of spool be called " pull-out direction ").
Housing 22 is fixed on the outside of this framework in gusset plate 18 sides of framework.In housing 22, accommodate unshowned lockout mechanism etc.This lockout mechanism allows spool 20 freely to rotate along coiling direction and pull-out direction usually, and stops spool 20 to rotate along pull-out direction when vehicle slows down fast.
Spool 20 has connecting portion 29, and this connecting portion 29 stretches out coaxially from pin sheet 16 side ends of spool 20.Connecting portion 29 roughly passes the circular hole that is formed in the pin sheet 16 coaxially, and reaches the outside of framework 12.Housing 32 is fixed on the outside of framework 12 in gusset plate 16 sides.Housing 32 is formed with an opening in framework 12 sides.This opening is closed by the cover cap 34 that is screwed on the housing 32.In addition, equally as shown in Figure 2, the opposition side with framework 12 in housing 32 also is formed with an opening, and this opening is closed by the cover cap 36 that is screwed on the housing 32.
As shown in Figure 3, accommodate tubular spare (barrel) 38 in housing 32, this tubular spare 38 constitutes the first propulsive effort transmitting portions and the second propulsive effort transmitting portions.Tubular spare 38 forms two axial end portion osed top stylostome shapes.Peripheral part at tubular spare 38 is formed with external tooth 40.External tooth 40 is a spur gear.
As shown in Figure 5, tubular spare 38 is supported on 42 places, solid column support portion rotationally, and this support portion forms in the side-walls of housing 32 stretches out.In addition, tubular spare 38 is coaxial with the connecting portion 29 (it passes the circular hole that is formed in the cover cap 34) of spool 20 and be connected with being integral, and with spool 20 unitary rotation.
In tubular spare 38, accommodate coil spring 44.The inner end of coil spring 44 is anchored on the support portion 42 of housing 32, and the outer end is anchored on the tubular spare 38.Coil spring 44 promotes spool 20 by tubular spare 38 along coiling direction.
The propelling thrust of (take-up force of ribbon 28 based on) coil spring 44 is set as and relatively is low to moderate the lax degree of eliminating the ribbon 28 that is applied to automotive occupant.That is to say that the propelling thrust of coil spring 44 is set as the corresponding intensity of ability that down automotive occupant is tightened with the state that applies ribbon 28 therein.Coil spring 44 does not need to have and is used for overcome friction etc. and the intensity of the ribbon 28 of pulling out from spool 20 of reeling fully.
Motorized retractor 10 has motor 48.Motor 48 spool 20 arranged beneath described to pin sheet 16,18 between, and be fixed on the sidewall of housing 32.The output shaft 50 of motor 48 passes the sidewall of housing 32 and is arranged in the housing 32.Flat flute profile output gear 52 is installed on output shaft 50.
In housing 32, be provided with the engaged clutch 54 that constitutes the first propulsive effort transmitting portions.To shown in Figure 6, engaged clutch 54 has driven wheel 56 as Fig. 4.Driven wheel 56 is owing to pivot shaft 58 is supported on housing 32 places, thereby freely rotates, and described pivot shaft 58 passes the axle center part of driven wheel 56 and is installed on the housing 32.In addition, be formed with flat flute profile external tooth 60 at the peripheral part place of driven wheel 56.These external tooths 60 and above-mentioned output gear 52 engagements.Therefore, when output gear 52 around its axis (, when output shaft 50 forward rotation of motor 48) when a direction (direction of arrow C) is rotated, driven wheel 56 centers on its axis and rotates along a direction (direction of arrow E).When output gear 52 around its axis (, when output shaft 50 backward rotation of motor 48) when other direction (direction of arrow D) rotates, driven wheel 56 centers on its axis and rotates along other direction (direction of arrow F).
Axial side (along direction one side of the arrow A among Fig. 4) at driven wheel 56 is provided with ratchet 62, and this ratchet 62 forms plate-like and constitutes described engaged clutch 54.Because pivot shaft 58 passes the axle center part of ratchet 62, so ratchet 62 is supported for freely at housing 32 places and rotates, and can be with respect to driven wheel 56 rotations.Driven wheel 56 sides at ratchet 62 are formed with hook tooth 64.
Another axial side (along the direction side of the arrow B among Fig. 4) at driven wheel 56 is provided with forward rotation ratchet 66, and this forward rotation ratchet 66 constitutes described engaged clutch 54.Forward rotation is supported on the pivot shaft 68 that stretches out at another axial end portion place of driven wheel 56 rotationally with ratchet 66.Forward rotation has engaging piece 72 with ratchet 66, and this mate 72 is relative with boss portion 70, and this boss portion 70 is formed on the axle center part of driven wheel 56 coaxially and has been configured as end stylostome.Because forward rotation is rotated around pivot shaft 68 with ratchet 66, thus engaging piece 72 near and away from boss portion 70.Position relative with engaging piece 72 in the sidewall of boss portion 70 is formed with a through hole.
Another axial side (the direction side of the arrow B among Fig. 4) at driven wheel 56 is provided with friction spring 74, and metal filament is crooked to be formed and constitute described engaged clutch 54 this friction spring 74 by making.Because friction spring 74 is clamped in the periphery (see figure 5) of the tubular maintaining part 76 of column of stretching out at cover cap 36 places by himself elastic force, so friction spring 74 is held with respect to cover cap 36 by friction force.An end of friction spring 74 is anchored at forward rotation ratchet 66 places.Notice that maintaining part 76 forms coaxially with pivot shaft 58.
When driven wheel 56 around its axis when a direction (direction of arrow E) is rotated, friction spring 74 makes forward rotation with boss portion 70 rotations towards driven wheel 56 of the engaging piece 72 of ratchet 66.Therefore, forward rotation is passed the described through hole that is formed in the boss portion 70 with the engaging piece 72 of ratchet 66, and with hook tooth 64 engagement of ratchet 62.Like this, one is connected driven wheel 56 with ratchet 66 by forward rotation with ratchet 62, and ratchet 62 rotates along a direction (direction of arrow E) around the axis of this ratchet 62 with ratchet 66 integratedly with driven wheel 56 and forward rotation.
In addition, when driven wheel 56 around its axis when other direction (direction of arrow F) rotates, friction spring 74 make forward rotation with the engaging piece 72 of ratchet 66 towards the side rotation opposite with the boss portion 70 of driven wheel 56.Therefore, forward rotation hook tooth 64 motions of the engaging piece 72 of ratchet 66 away from ratchet 62, thus cancellation driven wheel 56 and ratchet 62 are used ratchet 66 and the bonded assembly state by forward rotation.Like this, driven wheel 56 and ratchet 62 relative idle running.
Axial side (the direction side of the arrow A among Fig. 4) at ratchet 62 is provided with drum 80, and this drum 80 has formed foundation shape tube shape and constituted slide mechanism 78.Because pivot shaft 58 passes drum 80 axle center parts, so drum 80 is supported for freely at housing 32 places and rotates, and can be with respect to ratchet 62 rotations.In addition, the peripheral part at drum 80 is formed with flat flute profile external tooth 82.External tooth 82 meshes with the external tooth 40 of tubular spare 38.When drum 80 around its axis when a direction (direction of arrow E) is rotated, tubular spare 38 rotates along coiling direction (direction of arrow G).When drum 80 around its axis when other direction (direction of arrow F) rotates, tubular spare 38 rotates along pull-out direction (direction of arrow H).
Be provided with first clutch spring 84 in the inboard of drum 80, this first clutch spring 84 is formed with helical rib by metal filament, and constitutes described slide mechanism 78, and as first slide unit.The external diameter of first clutch spring 84 forms the internal diameter that is slightly larger than drum 80.The peripheral part close fit that first clutch spring 84 makes himself by himself elastic force is to the inner peripheral surface of drum 80.Therefore, first clutch spring 84 connects (maintenance) by friction force with respect to drum 80, and basically with drum 80 unitary rotation.
An end of the coiling direction of first clutch spring 84 is anchored on the ratchet 62.Therefore, ratchet 62 is connected by first clutch spring 84 with drum 80, and when ratchet 62 rotated, first clutch spring 84 and drum 80 rotated.Yet as mentioned above, first clutch spring 84 is the structures that keep with respect to drum 80 by friction force.Therefore, when between ratchet 62 and drum 80, apply above this friction force relatively rotate power the time, first clutch spring 84 slides with respect to drum 80.Like this, ratchet 62 one side and the 84 relative idle running of first clutch spring are on the other hand with drum 80 relative idle running.
This Motorized retractor 10 has the overload mechanism 86 that constitutes the second propulsive effort transmitting portions.As Fig. 4, Fig. 7 and shown in Figure 8, overload mechanism 86 has the intermediate gear 88 that forms foundation shape tube shape.Thereby intermediate gear 88 freely rotates (see figure 7) owing to pivot shaft 90 is supported on housing 32 places, and this pivot shaft 90 passes the axle center part of intermediate gear 88 and is installed on the housing 32.In addition, the peripheral part at intermediate gear 88 is formed with flat flute profile external tooth 92.External tooth 92 and above-mentioned output gear 52 engagements.Therefore, when output gear 52 around its axis (, when output shaft 50 forward rotation of motor 48) when a direction (direction of arrow C) is rotated, intermediate gear 88 centers on its axis and rotates along a direction (direction of arrow I).When output gear 52 around its axis (, when output shaft 50 backward rotation of motor 48) when other direction (direction of arrow D) rotates, intermediate gear 88 centers on its axis and rotates along other direction (direction of arrow J).
Axial direction side (the direction side of the arrow A among Fig. 4) at intermediate gear 88 is provided with the described adapter 94 of mechanism 86 that transships of formation.Adapter 94 has flange part 96, and this flange part 96 forms plate-like and is assembled together with the opening of intermediate gear 88 free to rotately.Forming the axial direction side (the arrow B direction side among Fig. 4) that the gear part 98 of solid cylinder shape forms at flange part 96 stretches out coaxially.Periphery in gear part 98 is formed with flat flute profile external tooth 100.In addition, form solid cylinder shape and be contained in another axial direction side (the direction side of the arrow A among Fig. 4) that the maintaining part 102 of intermediate gear 88 inboards forms at flange part 96 and stretch out coaxially.
Between the inner peripheral surface of the outer peripheral face of maintaining part 102 and intermediate gear 88, be formed with annular gap.Accommodate second clutch spring 104 in this gap, this second clutch spring 104 is formed with helical rib by metal filament, and constitutes described overload mechanism 86, and as second slide unit.The internal diameter of second clutch spring 104 forms the external diameter that is slightly less than maintaining part 102.The interior perimembranous close fit that second clutch spring 104 makes himself by himself elastic force is to the outer peripheral face of maintaining part 102, and second clutch spring 104 connects (maintenance) on maintaining part 102 by friction force thus.Therefore, second clutch spring 104 basically with intermediate gear 88 unitary rotation.
Two ends of the coiling direction of second clutch spring 104 all with intermediate gear 88 interferences, thereby make and to be restricted with respect to relatively rotating of intermediate gear 88.Therefore, intermediate gear 88 is connected by second clutch spring 104 with adapter 94, thereby when center tooth wheel 88 rotated, second clutch spring 104 and adapter 94 rotated.Yet as mentioned above, second clutch spring 104 is with respect to adapter 94 maintained structures by friction force.Therefore, when between intermediate gear 88 and adapter 94, apply above this friction force relatively rotate power the time, second clutch spring 104 slides with respect to adapter 94.Like this, intermediate gear 88 one side and the 104 relative idle running of second clutch spring are on the other hand with adapter 94 relative idle running.
This Motorized retractor 10 also has the centrifugal clutch 106 that constitutes the described second propulsive effort transmitting portions.Centrifugal clutch 106 has rotor 108, and this rotor 108 has formed foundation shape tube shape.Thereby rotor 108 freely rotates owing to pivot shaft 110 is supported on housing 32 places, this pivot shaft pass rotor 108 diapire axle center part and be installed on the housing 32.Be installed on the opening of rotor 108 by screw by metallic sheet material and with the cover cap 112 that disc shaped forms.Peripheral part at rotor 108 is formed with flat flute profile external tooth 114.These external tooths 114 mesh with the aforementioned external teeth 100 of the gear part 98 of adapter 94.Therefore, when adapter 94 around its axis when a direction (direction of arrow I) is rotated, rotor 108 centers on its axis and rotates along a direction (direction of arrow K).When adapter 94 around its axis when other direction (direction of arrow J) rotates, rotor 108 centers on its axis and rotates along other direction (direction of arrow L).
Axial direction side (along the direction side of the arrow A among Fig. 4) at rotor 108 is provided with gear 116, and this gear 116 is with the formation of solid cylinder shape and constitute described centrifugal clutch 106.Because pivot shaft 110 passes the axle center part of gear 116, thereby so gear 116 be supported on housing 32 places and freely rotate, and can be with respect to rotor 108 rotations.Peripheral part in the end side (the direction side of the arrow A among Fig. 4) of the axial direction of gear 116 is formed with flat flute profile external tooth 118.These external tooths 118 mesh with the aforementioned external teeth 40 of tubular spare 38.Therefore, when gear 116 around its axis when a direction (direction of arrow K) is rotated, tubular spare 38 rotates along pull-out direction (direction of arrow H).When gear 116 around its axis when other direction (direction of arrow L) rotates, tubular spare 38 rotates along coiling direction (direction of arrow G).
Peripheral part in the other end side (the direction side of the arrow B among Fig. 4) of the axial direction of gear 116 is formed with hook tooth 120.These hook tooths 120 are arranged in the inboard of rotor 108 by the circular hole in the axle center part that is formed on cover cap 112 122.
Disposed inboard at rotor 108 has a pair of counterweight 124, and this constitutes described centrifugal clutch 106 to counterweight 124, and forms with the shape of semicircle metallic material roughly (for example, iron etc.) plate.It is identical that this forms weight to counterweight 124, and be arranged in side respect to one another (180 ° side toward each other) along the peripheral direction of rotor 108.In an end of the peripheral direction of each counterweight 124, be formed with the circular batter 126 that is coupling.Solid column axial region 128 (see figure 8)s of stretching out from the diapire of rotor 108 are assembled together with these batters 126 that are coupling free to rotately.Like this, described counterweight 124 is supported on rotor 108 places, thereby the radial direction around axial region 128 along rotor 108 is rotated respectively.
Described quilt promotes towards the inboard of the radial direction of rotor 108 by a pair of torsion coil spring 130 on the diapire that is installed to rotor 108 to counterweight 124, and remains on the radial direction side place of rotor 108 usually.In addition, described hook tooth counterweight 124 and said gear 116 120 relative positions are formed with engagement projections 132.Under the state that the described therein inboard that counterweight 124 is maintained at the radial direction of rotor 108 is located, these engagement projections 132 are separated with hook tooth 120.
Notice that be furnished with sheet material 134 described between to counterweight 124 and cover cap 112, the plate that this sheet material is made by resin material forms with tubular shape.Prevented described to counterweight 124 and cover cap 112 direct friction each other.
Here, when rotor 108 around its axis when other direction (direction of arrow L) rotates, be supported on the described rotational that counterweight 124 is centered on rotor 108 along with rotor 108 at rotor 108 places.At this moment, to described counterweight 124 is applied centnifugal force.Therefore, when be applied to described to the centnifugal force on the counterweight 124 during more than or equal to predetermined value (, when the rotating speed of rotor 108 during more than or equal to predetermined value), described to counterweight 124 overcome described to torsion coil spring 130 propelling thrust and rotate towards the outside of the radial direction of rotor 108.When described to counterweight 124 like this when rotate in the outside of the radial direction of rotor 108, be arranged on described described to counterweight 124 places to hook tooth 120 engagements of engagement projections 132 with gear 116.Described therein under engagement projections 132 and the hook tooth 120 ingear states, rotor 108 is connected counterweight 124 one by described with gear 116, and rotor 108, described to counterweight 124 and gear 116 unitary rotation.
When be applied to described to the centnifugal force on the counterweight 124 during less than predetermined value (, when the rotating speed of rotor 108 during) less than predetermined value, described to counterweight 124 by described to torsion coil spring 130 propelling thrust and rotate towards the inboard of the radial direction of rotor 108, thereby cancel the state that meshes together of described hook tooth 120 to engagement projections 132 and gear 116.Under this state, can dally relatively between rotor 108 and the gear 116.
Here, in this Motorized retractor 10, the reduction ratio that is produced by the external tooth 40 (the first propulsive effort transmitting portions) of the external tooth 82 of the external tooth 60 of output gear 52, driven wheel 56, drum 80 and tubular spare 38 is set as and enough is lower than the total reduction gear ratio that the external tooth 40 (the second propulsive effort transmitting portions) by the external tooth 118 of the external tooth 114 of the external tooth 100 of the gear part 98 of the external tooth 92 of output gear 52, intermediate gear 88, adapter 94, rotor 108, gear 116 and tubular spare 38 produces.
On the other hand, as shown in Figure 1,, carry out control to motor 48 power supply by control setup 138 at this Motorized retractor 10 places.Control setup 138 is made of actuator 140 and ECU 142.Motor 48 is electrically connected on the battery 144 that is installed in the vehicle by actuator 140, and will be fed to motor 48 from the electric current of battery 144 by actuator 140.Actuator 140 is connected on the ECU142.Whether pass through direction and the size thereof of actuator 140 by ECU 142 controls to motor 48 power supplies, institute's supply of current.
ECU 142 is connected on buckle switch (buckle switch) 146 and the Forward Monitor device 148, described buckle switch 146 is exported and whether has been applied ribbon 28 corresponding signals to automotive occupant, and described Forward Monitor device 148 outputs are according to the signal of distance between the obstacle of vehicle and vehicle front.
When the hyoplastron that will be arranged on ribbon 28 places was connected on the buckle device (hyoplastron and buckle device are all not shown), buckle switch 146 was connected (ON) signals to ECU 142 outputs.When cancellation was connected to state on the buckle device with hyoplastron, buckle switch 146 disconnected (OFF) signals to ECU 142 outputs.That is, whether buckle switch 146 exists according to hyoplastron and buckle device and is connected and to one of them signal of ECU 142 above-mentioned connection signals of output and cut-off signal, whether this connection has applied ribbon 28 corresponding to automotive occupant.
Forward Monitor device 148 has near the infradred sensor 150 the leading section that is located at vehicle.Infradred sensor 150 is at vehicle front emission infrared ray, and reception is from advancing or being parked in another vehicle of this vehicle front or the infrared ray of obstacle reflected back (" obstacle " for convenience, also comprises another vehicle of advancing or stopping).
Forward Monitor device 148 also comprises calculating section 152.Calculating section 152 is based on being reflected by object and return the distance of required Time Calculation of moment of infradred sensor 150 from obstacle from being carved into these infrared rays when infradred sensor 150 emission is ultrared.Calculating section 152 is exported obstacle detection signal Os based on result of calculation to ECU 142.If more than or equal to predetermined value, then obstacle detection signal Os is a low level from the distance of obstacle, if from the distance of obstacle during less than predetermined value, then obstacle detection signal Os is a high level.
Here, for this Motorized retractor 10, ECU 142 and actuator 140 are configured in first speed with than the rotating speed of the output shaft 50 of switch motor 48 between two grades of the first fireballing second speed.
Particularly, when from the signal of buckle switch 146 input when connection signal becomes cut-off signal, ECU 142 is to the control signal of actuator 140 output beginnings to motor 48 power supplies.The actuator 140 that this control signal was input to is the electric current F of I1 from battery to motor 48 supply of current values.In this case, the output shaft 50 of motor 48 (output gear 52) rotates along direction (direction of arrow C) with first speed.
In addition, for this Motorized retractor 10, when from the obstacle detection signal Os of calculating section 152 input when low level becomes high level, ECU 142 is to actuator 140 output function signals, with beginning to motor 48 power supplies.The actuator 140 that this operation signal was input to is the electric current R of I2 from battery to motor 48 supply of current values.In this case, the current value I 2 of electric current R is set as the current value I 1 greater than electric current F, and the direction of electric current R to be set as be the reversing sense of electric current F direction.Therefore, in this case, the output shaft 50 of motor 48 (output gear 52) is to rotate along inverse direction (direction of arrow D) than the first fireballing second speed.
Next the operation of this first embodiment is described.
In Motorized retractor 10 with said structure, ribbon 28 stratification are wound on holding under the state on the spool 20 therein, when in the time of the unshowned hyoplastron of pulling, spurring ribbon 28, spool 20 overcomes the propelling thrust that promotes the coil spring 44 of spool 20 along coiling direction, rotate along pull-out direction, ribbon 28 is drawn out simultaneously.
Like this, under the state that ribbon 28 is drawn out, hyoplastron is inserted in the buckle device therein, ribbon 28 is placed around the place ahead that is sitting in the automotive occupant health on the seat simultaneously, and hyoplastron is remained in the buckle device.Ribbon 28 is arranged under the state that is applied on the automotive occupant health therefrom.
Automotive occupant has applied under the state of ribbon 28 so therein, and ribbon 28 fetters automotive occupant by the propelling thrust of coil spring 44 relatively more weakly.In addition, under this state, to the connection signal of ECU 142 inputs from buckle switch 146.
On the other hand, stop and when buckle device removed hyoplastron, spool 20 rotated along coiling direction by the propelling thrust of coil spring 44 when automotive occupant.Yet, because a little less than the propelling thrust of coil spring 44 is set as relatively, so spool 20 is to rotate along coiling direction relative to more weak turning effort with the propelling thrust of coil spring 44 is corresponding.
In addition, at this moment, import cut-off signals to ECU 142 from buckle device 146.The ECU 142 that cut-off signal was input to is used for beginning to motor 48 power supplies to actuator 140 output control signals.The actuator 140 that this control signal was input to makes the output shaft 50 (output gear 52) of motor 48 rotate along direction (around a direction of axis, the direction of arrow C) with first speed.When output gear 52 around its axis when a described direction (direction of arrow C) is rotated, the intermediate gear 88 of overload mechanism 86 (its external tooth 92 and output gear 52 engagements) rotates along a direction (direction of arrow I) around its axis.
The rotation of intermediate gear 88 is delivered to adapter 94 by second clutch spring 104, thereby adapter 94 rotates along a direction (direction of arrow I) around its axis.Therefore, the rotor 108 of centrifugal clutch 106 external tooth 100 engagements of the gear part 98 of adapter 94 (its external tooth 114 with) rotates around its axis along a direction (direction of arrow K), and centnifugal force is applied to is supported on the described on the counterweight 124 of rotor 108 places.In this case, be applied to described to the centnifugal force on the counterweight 124 can not be increased to make described to counterweight 124 overcome described to torsion coil spring 130 propelling thrust and the degree of rotating towards the outside of the radial direction of rotor 108.Therefore, the described inboard that counterweight 124 is remained on the radial direction of rotor 108 by described propelling thrust to torsion coil spring 130.Under this state, described to the hook tooth 120 of engagement projections 132 away from gear 116, thereby rotor 108 with described to counterweight 124, described to torsion coil spring 130, sheet material 134 and cover cap 112 with respect to gear 116 idle running.
On the other hand, when output gear 52 as mentioned above with first speed around its axis when a direction (direction of arrow C) is rotated, the driven wheel 56 of engaged clutch 54 (its external tooth 60 and output gear 52 engagements) centers on its axis and rotates along a direction (direction of arrow E).
Therefore, friction spring 74 makes forward rotation rotate with ratchet 66, and makes hook tooth 64 engagements of forward rotation with engaging piece 72 with the ratchet 62 of ratchet 66.Like this, the rotation of driven wheel 56 is delivered to ratchet 62 by forward rotation with ratchet 66, thereby ratchet 62 rotates along a direction (direction of arrow E) around its axis.The rotation of ratchet 62 is delivered to drum 80 by first clutch spring 84, thereby drum 80 rotates with first clutch spring 84 and ratchet 62 integratedly around its axis along a direction (direction of arrow E).Therefore, tubular spare 38 (its external tooth 40 meshes with the external tooth 82 of drum 80) rotates along coiling direction (direction of arrow G), and therefore spool 20 is rotated along coiling direction.Owing to the rotation of spool 20 has compensated the deficiency of the propelling thrust of coil spring 44, thereby make ribbon 28 stratification be wound up on the spool 20 and be received (so-called " coiling auxiliary mechanism ").
In addition, under described situation, the reduction ratio of the first propulsive effort transmitting portions (external tooth 40 of the external tooth 60 of output gear 52, driven wheel 56, the external tooth 82 of drum 80 and tubular spare 38) is set as the reduction ratio that fully is lower than the second propulsive effort transmitting portions (external tooth 118 of the external tooth 100 of the external tooth 92 of output gear 52, intermediate gear 88, the gear part 98 of adapter 94, the external tooth 114 of rotor 108, the gear 116 and external tooth 40 of tubular spare 38), thereby spool 20 rotates with low torque.Therefore, ribbon can by safety coiling around and be contained on the spool 20.
In addition, ribbon 28 is by under the auxiliary state that is wound up on the spool 20 of the first propulsive effort transmitting portions therein, if (for example apply more than or equal to the torque of first setting value to spool 20, if foreign matter hangs on the ribbon 28), then apply torque to the drum 80 of slide mechanism 78 more than or equal to predetermined value by spool 20 and tubular spare 38.In this case, the first clutch spring 84 that remains on drum 80 places by friction force dallies (slip) with respect to drum 80, thereby and ratchet 62 is relatively rotated with respect to drum 80.Like this, therein under the situation that ribbon 28 and foreign matter are interfered, can prevent that ribbon 28 is forced to be wound up on the spool 20, and can prevent to from the corresponding component of ratchet 62 (towards the structure of output shaft 50, for example forward rotation is with ratchet 66, driven wheel 56, output gear 52 etc.) apply very large torque, and can prevent to damage these corresponding components and burn motor 48 etc.
When ribbon 28 was wound up on the spool 20 fully, the output shaft 50 (output gear 52) that makes motor 48 by ECU 142 and actuator 140 (direction of arrow D) in opposite direction rotated (backward rotation) scheduled volume.Therefore, driven wheel 56 (its external tooth 60 and output gear 52 engagements) rotates scheduled volume around its axis along other direction (direction of arrow F), and friction spring 74 makes forward rotation use the engaging piece 72 of ratchet 66 to rotate towards the opposition side of the boss portion 70 of driven wheel 56.Therefore, forward rotation hook tooth 64 motions of the engaging piece 72 of ratchet 66 away from ratchet 62, thus cancellation driven wheel 56 and ratchet 62 are by forward rotation ratchet 66 bonded assembly states.Like this, the output shaft 50 of spool 20 and motor was cancelled by being connected of engaged clutch 54, thereby can once more the ribbon 28 that is wound on the spool 20 be pulled out.
On the other hand, therein under the state that vehicle is advanced, calculating part 152 calculates the distance from the obstacle of vehicle front based on the testing result at the infradred sensor 150 of Forward Monitor device 148.For example, if vehicle front does not have obstacle, if perhaps have obstacle but distance from this obstacle to vehicle more than or equal to predetermined value, then from calculating part 152 output low level signals.On the contrary, if the distance from vehicle to the place ahead obstacle is less than predetermined value, then from calculating part 152 output high level signals.
When from calculating part 152 during to ECU 142 input high level signals, ECU 142 is to actuator 140 output scheduled operation signals.Actuator 140 beginnings that are transfused to described operation signal under this state are powered to motor 48, thereby output shaft 50 (output gear 52) is rotated along inverse direction (around the other direction of axis, the direction of arrow D) with second speed.
Therefore, driven wheel 56 (its external tooth 60 and output gear 52 engagements) rotates along other direction (direction of arrow F) around its axis.In this case, the state that forward rotation keeps the hook tooth 64 with ratchet 62 to separate with the engaging piece 72 of ratchet 66 by friction spring 74, thus keep driven wheel 56 and the state that is cancelled being connected of ratchet 62.
On the other hand, when output gear 52 as mentioned above around its axis along other direction (direction of arrow D) when rotating with second speed, the intermediate gear 88 of overload mechanism 86 (its external tooth 92 and output gear 52 engagements) centers on its axis and rotates along other direction (direction of arrow J).
The rotation of intermediate gear 88 is delivered to adapter 94 by second clutch spring 104, thereby adapter 94 rotates along other direction (direction of arrow J) around its axis.Therefore, the rotor 108 of centrifugal clutch 106 external tooth 100 engagements of the gear part 98 of adapter 94 (its external tooth 114 with) rotates around its axis along other direction (direction of arrow L), and described counterweight 124 is applied centnifugal force more than or equal to predetermined value to what be supported on rotor 108 places.Therefore, described to counterweight 124 overcome described to torsion coil spring 130 propelling thrust and rotate towards the outside of the radial direction of rotor 108, thereby be arranged on described to the engagement projections 132 at counterweight 124 places and hook tooth 120 engagements of gear 116.Like this, the rotation of rotor 108 is delivered to gear 116 by described to counterweight 124, thereby gear 116 is rotated along other direction (direction of arrow L) around its axis.
Therefore, spool 20 (its external tooth 40 meshes with the external tooth 118 of gear 116) rotates along coiling direction (direction of arrow G).Because spool 20 rotates along coiling direction, so ribbon 28 is winding on the spool 20.Like this, eliminate absent-mindedness or so-called " relaxing " of ribbon 28, and improved the power (so-called " pre-stretching device ") of ribbon 28 maintenance automotive occupant healths.
In addition, under described state, the rotation of the output shaft 50 of motor 48 is higher than the reduction ratio of the first propulsive effort transmitting portions (external tooth 40 of the external tooth 60 of output gear 52, driven wheel 56, the external tooth 82 of drum 80 and tubular spare 38) by reduction ratio the second propulsive effort transmitting portions (external tooth 118 of the external tooth 100 of the external tooth 92 of output gear 52, intermediate gear 88, the gear part 98 of adapter 94, the external tooth 114 of rotor 108, the gear 116 and external tooth 40 of tubular spare 38) is delivered to spool 20.Therefore, spool 20 rotates along coiling direction with high torque (HT).Therefore, for example when ribbon 28 is wound on the spool 20, therefore (snap catch) and automotive occupant begin towards the front part of vehicle motion even vehicle slows down fast, also can overcome this force of inertia of automotive occupant and the ribbon 28 of forcing to reel.
In addition, ribbon 28 is wound under the state on the spool 20 by the second propulsive effort transmitting portions therein, when the torque that applies to spool 20 more than or equal to second setting value (for example, eliminating so-called " relaxing ", the health of automotive occupant becomes obstacle and ribbon 28 can not further reel basically the time again etc.), since by friction force with respect to the maintaining part 102 maintained second clutch springs 104 of adapter 94 with respect to adapter 94 idle running (slip), rotation transmission between adapter 94 and the intermediate gear 88 (output gear 52) is cut off, thus the two relative idle running.Like this, can prevent by rotor 108, described to counterweight 124 and gear 116 be connected to spool 20 usefulness on the adapter 94 motor 48 propulsive effort and rotating along coiling direction, and can prevent that ribbon 28 is by tightly fettering the health of automotive occupant greater than required power greater than required power.
When ribbon 28 is wound on the spool 20 fully, the output shaft 50 (output gear 52) of motor 48 is stopped by ECU 142 and actuator 140.Therefore, the rotation of intermediate gear 88, second clutch spring 104, adapter 94 and rotor 108 stops, and is applied to and described centnifugal force on the counterweight 124 is disappeared.Like this, described to counterweight 124 by described to torsion coil spring 130 propelling thrust and rotate towards the inboard of the radial direction of rotor 108, thereby the state that meshes together of described hook tooth 120 to engagement projections 132 and gear 116 is cancelled.Therefore, can dally relatively between rotor 108 and the gear 116, thereby the output shaft 50 of spool 20 and motor was cancelled by being connected of centrifugal clutch 106.Yet, under this state, stop spool 20 to rotate by the unshowned lockout mechanism that is located in the housing 22, thereby stop ribbon 28 to be drawn out along pull-out direction.
Here, in Motorized retractor 10 about this first embodiment, as mentioned above, because ECU142 and actuator 140 switch to first speed or second speed with the rotating speed of the output shaft 50 of motor 48, therefore 20 turning effort bang path is switched to first propulsive effort transmitting portions (through the path of engaged clutch 54 and slide mechanism 78) or the second propulsive effort transmitting portions (through the path of overload mechanism 86 and centrifugal clutch 106) from motor 48 to spool.Therefore, that need not adopted in the conventional electric taking-up device comprises solenoidal complicated switching construction, thereby can make device compact more.
As mentioned above, according to Motorized retractor 10, can realize coiling auxiliary mechanism and the pre-required conflicting performance of stretching device by single motor 48, and not need switching mechanism, thereby can make device compact more about this first embodiment.
＜the second embodiment 〉
Next second embodiment of the present invention will be described.Note, with the structure of above-mentioned first embodiment and the essentially identical structure of operation and operation use with first embodiment in identical Reference numeral represent that and the descriptions thereof are omitted.
In Fig. 9, show structure about the first propulsive effort transmitting portions of the Motorized retractor 200 of second embodiment of the invention with expansion drawing.
The structure of Motorized retractor 200 is substantially similar to the structure about the Motorized retractor 10 of above-mentioned first embodiment, but is provided with gear 202 between driven wheel 56 that constitutes the first propulsive effort transmitting portions and output gear 52.Be formed on external tooth 60 engagements of flat flute profile external tooth 204 and driven wheel 56 of the periphery of gear 202, and with output gear 52 engagements.
Therefore, for Motorized retractor 200, when output shaft 50 (output gear 52) forward rotation of motor 48 (rotating in the direction of arrow C), gear 202 rotates around its axis along a direction (direction of arrow M), thereby driven wheel 56 is rotated along other direction (direction of arrow F) around its axis.In this case, as mentioned above, driven wheel 56 and ratchet 62 keep cancelling by the coupled condition of forward rotation with ratchet 66, thus driven wheel 56 and ratchet 62 relative idle running.
On the other hand, when output shaft 50 (output gear 52) backward rotation (in the direction of arrow D) of motor 48, gear 202 rotates along other direction (direction of arrow N) around its axis, thereby driven wheel 56 rotates along a direction (direction of arrow E) around its axis.In this case, as mentioned above, driven wheel 56 is connected with ratchet 66 by forward rotation with ratchet 62, thereby engaged clutch 54 is located under the coupled condition.
Here, in Motorized retractor 200, when the output shaft 50 (output gear 52) of motor 48 rotates (rotating in the direction of arrow D) with first velocity reversal as mentioned above, because the engaged clutch 54 of the first propulsive effort transmitting portions is arranged under the coupled condition, therefore the rotation of output shaft 50 is delivered to spool 20 by engaged clutch 54, slide mechanism 78 and tubular spare 38, thereby spool 20 is rotated along coiling direction (direction of arrow G).
On the contrary, when the output shaft 50 (output gear 52) of motor 48 during with second speed backward rotation (rotating in the direction of arrow D), the centrifugal clutch 106 of the second propulsive effort transmitting portions is arranged under the coupled condition, thereby the rotation of output shaft 50 is delivered to spool 20 by the second propulsive effort transmitting portions (overload mechanism 86 and centrifugal clutch 106).In this case, the engaged clutch 54 of the first propulsive effort transmitting portions also is arranged under the coupled condition.Yet, because the first clutch spring 84 of slide mechanism 78 is with respect to drum 80 idle running (slips), thus by the first propulsive effort transmitting portions 20 turning effort transmission is cut off from motor 48 to spool.
That is, in Motorized retractor 200, the output shaft 50 of motor 48 (output gear 52) always rotates along a direction (direction of arrow D) by ECU 142.Yet because ECU 142 switches to first speed or second speed with the rotating speed of output shaft 50, therefore 20 turning effort bang path is switched to the first propulsive effort transmitting portions or the second propulsive effort transmitting portions from motor 48 to spool.Therefore, can simplify the drive controlling to motor 48 of being undertaken by ECU 142.
Note, can use such structure to replace slide mechanism 78, this structure adopts a power-transfer clutch, this power-transfer clutch keeps the coupled condition of output shaft 50 and spool 20, rotating speed up to output shaft 50 reaches second speed, and cancels the coupled condition of output shaft 50 and spool 20 when the rotating speed of output shaft 50 becomes second rotating speed.In this case, can show equally and operation and substantially similar operation and the effect of effect according to the Motorized retractor 200 of this second embodiment.
＜the three embodiment 〉
Next the third embodiment of the present invention will be described.Note, with the structure of above-mentioned first embodiment and the essentially identical structure of operation and operation use with first embodiment in identical Reference numeral represent that and the descriptions thereof are omitted.
In Figure 10, illustrate about the first propulsive effort transmitting portions of the Motorized retractor 300 of third embodiment of the invention and the structure of the second propulsive effort transmitting portions with exploded perspective.In addition, in Figure 11, show the structure of the first propulsive effort transmitting portions of Motorized retractor 300 with cutaway view.
Motorized retractor 300 is configured to be substantially similar to the Motorized retractor 10 about above-mentioned first embodiment.Yet Motorized retractor 300 has engaged clutch 302 and the slide mechanism 304 that constitutes the first propulsive effort transmitting portions, rather than about engaged clutch 54 and the slide mechanism 78 of first embodiment.
As Figure 12 and shown in Figure 13, engaged clutch 302 has driven wheel 306.Driven wheel 306 is owing to the pivot shaft 58 that the axle center part that passes this driven wheel 306 is installed to housing 32 is supported on housing 32 places, thereby freely rotates.Peripheral part at driven wheel 306 is formed with flat flute profile external tooth 60, and these external tooths 60 and above-mentioned output gear 52 engagements.Therefore, when output gear 52 around its axis (, when output shaft 50 forward rotation of motor 48) when a direction (direction of the arrow C among Figure 10) is rotated, driven wheel 306 centers on its axis and rotates along a direction (direction of the arrow E among Figure 10).When output gear 52 around its axis (, when output shaft 50 backward rotation of motor 48) when other direction (direction of the arrow D among Figure 10) rotates, driven wheel 306 centers on its axis and rotates along other direction (direction of the arrow F among Figure 10).
Axial direction side (the direction side of the arrow A among Figure 12 and Figure 13) at driven wheel 306 is provided with ratchet 308, and this ratchet 308 forms plate-like and constitutes engaged clutch 302.Because pivot shaft 58 passes the axle center part of ratchet 308, thereby so ratchet 308 be supported on housing 32 places and freely rotate, and can be with respect to driven wheel 306 rotations.Driven wheel 306 sides at ratchet 308 are formed with external tooth 310.External tooth 310 is arranged in the inboard of boss portion 312, and this boss portion 312 is formed at the axle center part place of driven wheel 306 and has formed foundation body tube shape.
Another axial direction side (the direction side of the arrow B among Figure 12 and Figure 13) at driven wheel 306 is provided with the forward rotation that constitutes engaged clutch 302 ratchet 314 and backward rotation ratchet 316.Forward rotation has main part 318 and main part 320 with ratchet 314 and backward rotation respectively with ratchet 316.These main parts 318,320 are supported in respectively on the pivot shaft 322 and pivot shaft 324 that stretches out in the other end of the axial direction of driven wheel 306 rotationally.In addition, forward rotation has engaging piece 326 with ratchet 314, and a side (the direction side of the arrow E of Figure 12 and Figure 13) of engaging piece 326 peripheral direction of 306 from main part 318 towards driven wheel is extended.Backward rotation has engaging piece 328 with ratchet 316, and the opposite side (the direction side of the arrow F Figure 12 and Figure 13) of engaging piece 328 peripheral direction of 306 from main part 320 towards driven wheel extends.In addition, forward rotation has follower 327 with ratchet 314, and the opposite side (the arrow F direction side Figure 12 and Figure 13) of this follower 327 peripheral direction of 306 from main part 318 towards driven wheel extends.Backward rotation has follower 329 with ratchet 316, and a side (the direction side of the arrow E of Figure 12 and Figure 13) of this follower 329 peripheral direction of 306 from main part 320 towards driven wheel is extended.
Forward rotation is arranged to relative with the boss portion 312 of driven wheel 306 with ratchet 314 with backward rotation with ratchet 316.Because forward rotation is rotated around pivot shaft 322,324 with ratchet 316 with ratchet 314 and backward rotation, thus engaging piece 326,328 near and away from boss portion 312.In the sidewall of boss portion 312, be formed with through hole 330,332 with ratchet 314 and backward rotation with the relative position of ratchet 316 with forward rotation.It is relative with the external tooth 310 that is arranged in boss portion 312 inboards of ratchet 308 that forward rotation all can engage ground (engageable ground) with the engaging piece 326 of ratchet 324 and backward rotation with the engaging piece 328 of ratchet 316.
Opposite side (the direction side of the arrow B of Figure 12 and Figure 13) at the axial direction of driven wheel 306 is provided with counterweight 334, and this counterweight 334 constitutes engaged clutchs 302 and as inertia member.Counterweight 334 forms the roughly semi-circular plate shape of being made by metallic material, and is formed with circular hole 336 at its axle center part.The solid column pivot shaft 338 that stretches out at the axle center part of driven wheel 306 is assembled together rotationally with circular hole 336.Like this, counterweight 334 is supported for and can rotates with respect to driven wheel 306.
Be formed with anchor hole 340 near the circular hole 336 of counterweight 334, an end anchorage of torsion coil spring 342 is at these anchor hole 340 places.On the anchoring projection 344 that the other end anchoring of torsion coil spring 342 is to stretch out at driven wheel 306 places.Counterweight 334 common propelling thrusts by torsion coil spring 342 remain on the predetermined center position (state shown in Figure 14) with respect to driven wheel 306.
A pair of driving projection 346,348 is stretched out in end in driven wheel 306 sides of counterweight 334, this to projection 346,348 against forward rotation with ratchet 314 and backward rotation with ratchet 316.This is arranged in the through hole 330,332 of driven wheel 306 driving projection 346,348, and respectively forward rotation is remained under the state away from the external tooth 310 of ratchet 308 with the engaging piece 328 of ratchet 316 with the engaging piece 326 of ratchet 314 and backward rotation.
Here, for engaged clutch 302, when driven wheel 306 around its axis when a direction (direction of the arrow E among Figure 14) is rotated, counterweight 334 is owing to inertia attempts to remain on original position.Therefore, driven wheel 306 rotates scheduled volume around axis along a direction (direction of the arrow E among Figure 14) with respect to counterweight 334.So, as shown in figure 15, when driving projection 346,348 respectively against the interior perimembranous of through hole 330,332, counterweight 334 is restricted with respect to relatively rotating of driven wheel 306, and counterweight 334 moves under the state of scheduled volume with respect to driven wheel 306 along other direction from center position around axis therein, and counterweight 334 is rotated along a direction around axis with driven wheel 306.
Like this, counterweight 334 moves under the state of scheduled volume with respect to driven wheel 306 along other direction from center position around axis therein, and the driving projection 346 of counterweight 334 is stepped up the follower 327 of forward rotation with ratchet 314.Like this, forward rotation is with the follower 327 of ratchet 314 movement outside towards the radial direction of driven wheel 306, and forward rotation is with the interior lateral movement towards the radial direction of driven wheel 306 of the engaging piece 326 of ratchet 314, and with external tooth 310 engagements of ratchet 308.Like this, the rotation of driven wheel 306 around its axis along a direction is delivered to ratchet 308 by forward rotation with ratchet 314, thereby ratchet 308 is rotated along a direction around its axis.
In addition, when driven wheel 306 stopped, counterweight 334 was returned its center position with respect to driven wheel 306 (state shown in Figure 14) by the propelling thrust of torsion coil spring 342.Therefore, the driving projection 346 of counterweight 334 is moved away from the follower 327 of forward rotation with ratchet 314, and makes forward rotation external tooth 310 motions of the engaging piece 326 of ratchet 314 away from ratchet 308.Like this, be cancelled by the rotation transmission of forward rotation between driven wheel 306 and the ratchet 308 with ratchet 314.
On the other hand, when driven wheel 306 around its axis when other direction (direction of the arrow F among Figure 14) rotates, counterweight 334 is owing to inertia attempts to remain on situ.Therefore, driven wheel 306 rotates scheduled volume around axis along other direction with respect to counterweight 334.So, as shown in figure 16, when driving projection 346,348 respectively against the interior perimembranous of through hole 330,332, counterweight 334 is restricted with respect to relatively rotating of driven wheel 306, and counterweight 334 moves under the state of scheduled volume with respect to driven wheel 306 along a direction from center position around axis therein, and counterweight 334 is rotated along other direction around axis with driven wheel 306.
Like this, counterweight 334 moves with respect to driven wheel 306 under the state of scheduled volume along a described direction from center position around axis therein, and the driving projection 348 of counterweight 334 is stepped up the follower 329 of backward rotation with ratchet 316.Like this, backward rotation is with the follower 329 of ratchet 316 movement outside towards the radial direction of driven wheel 306, and backward rotation is with the interior lateral movement towards the radial direction of driven wheel 306 of the engaging piece 328 of ratchet 316, and with external tooth 310 engagements of ratchet 308.Like this, the rotation of driven wheel 306 around its axis along described other direction is delivered to ratchet 308 by backward rotation with ratchet 316, thereby ratchet 308 is rotated along other direction around its axis.
In addition, when driven wheel 306 stopped, counterweight 334 was returned its center position with respect to driven wheel 306 (state shown in Figure 14) by the propelling thrust of torsion coil spring 342.Therefore, the driving projection 348 of counterweight 334 is moved away from the follower 329 of backward rotation with ratchet 316, and makes backward rotation external tooth 310 motions of the engaging piece 328 of ratchet 316 away from ratchet 308.Like this, used backward rotation to be cancelled between driven wheel 306 and the ratchet 308 with the rotation transmission of ratchet 316.
Notice that counterweight 334 is positioned under the state of center position therein, describedly be arranged to respectively to separate preset distance with the follower 327 of ratchet 314 and backward rotation with the follower 329 of ratchet 316 with forward rotation to driving projection 346,348.Even counterweight 334 is rotated slightly with respect to driven wheel 306, forward rotation is not rotated with ratchet 316 with ratchet 314 and backward rotation yet.
Other direction is provided with drum 80 in the side (the direction side of the arrow A of Figure 12 and Figure 13) of the axial direction of ratchet 308, and this drum 80 has formed foundation shape tube shape and constituted slide mechanism 304.The structure of drum 80 is substantially similar to the structure about the drum 80 of above-mentioned first embodiment.As shown in Figure 10 and Figure 11, be formed on external tooth 40 engagements of external tooth 82 and tubular spare 38 on the peripheral part of drum 80.Therefore, when drum 80 around its axis when a direction (direction of the arrow E among Figure 10) is rotated, tubular spare 38 rotates along coiling direction (direction of the arrow G among Figure 10).When drum 80 around its axis when other direction (direction of the arrow F among Figure 10) rotates, tubular spare 38 rotates along pull-out direction (direction of the arrow H among Figure 10).
Be provided with first clutch spring 350 in the inboard of drum 80, this first clutch spring 350 is as first slide unit that constitutes slide mechanism 304.C shape forms first clutch spring 350 by metal sheet being bent to roughly, and has the function that is substantially similar to about the first clutch spring 84 of above-mentioned first embodiment.That is, the outer peripheral face close fit of first clutch spring 350 is to the inner peripheral surface of drum 80.Be formed on first clutch spring 350 and be anchored at ratchet 308 places along the anchoring section 352 at the place, end of its bending direction.Like this, drum 80 is connected on the ratchet 308 by first clutch spring 350, and basically with ratchet 308 unitary rotation.Yet, when between ratchet 308 and drum 80, applying predetermined value or bigger turning effort, because first clutch spring 350 slides with respect to drum 80, so ratchet 308 one side and the 350 relative idle running of first clutch spring, on the other hand with drum 80 relative idle running.
In addition, in Motorized retractor 300, when automotive occupant begins to apply ribbon 28 (for example, ribbon 28 is stored under the state in this Motorized retractor 300 fully therein, when unshowned coiling quantity sensor etc. detects spool 20 when pull-out direction rotates), ECU 142 and actuator 140 make the output shaft 50 of motor 48 rotate with first speed along inverse direction (around the other direction of axis, the direction of the arrow D among Figure 10).So when from buckle switch 146 input connection signals, ECU 142 and actuator 140 stop the output shaft 50 of motor 48.
Notice that in Motorized retractor 300, other structure member is configured to be substantially similar to the structure member about the Motorized retractor 10 of above-mentioned first embodiment.
Next the operation of this 3rd embodiment is described.
In Motorized retractor 300 with said structure, by with about identical mode in the Motorized retractor 10 of above-mentioned first embodiment, when automotive occupant when buckle device removes hyoplastron, ECU142 and device 140 make the output shaft 50 (output gear 52) of motor 48 rotate with first speed along direction (around a direction of axis, the direction of the arrow C among Figure 10).When output gear 52 around its axis when a described direction is rotated, the driven wheel 306 of engaged clutch 302 (its external tooth 60 and output gear 52 engagements) rotates along a direction (direction of the arrow E among Figure 10) around its axis.
When driven wheel 306 around its axis when a described direction (direction of the arrow E among Figure 10) is rotated, counterweight 334 is owing to inertia attempts to remain on original position.Therefore, driven wheel 306 rotates scheduled volume around its axis along a described direction with respect to counterweight 334.So, as shown in figure 15, when driving projection 346,348 respectively against the interior perimembranous of through hole 330,332, counterweight 334 is restricted with respect to relatively rotating of driven wheel 306, and counterweight 334 moves under the state of scheduled volume with respect to driven wheel 306 along other direction from center position around axis therein, and counterweight 334 is rotated along a described direction around its axis with driven wheel 306.
Like this, counterweight 334 moves under the state of scheduled volume with respect to driven wheel 306 along described other direction from center position around axis therein, and the driving projection 346 of counterweight 334 is stepped up the follower 327 of forward rotation with ratchet 314.Like this, forward rotation is with the follower 327 of ratchet 314 movement outside towards the radial direction of driven wheel 306, and forward rotation is with the interior lateral movement towards the radial direction of driven wheel 306 of the engaging piece 326 of ratchet 314, and with external tooth 310 engagements of ratchet 308.Like this, the rotation of driven wheel 306 around its axis along a described direction is delivered to ratchet 308 by forward rotation with ratchet 314, thereby ratchet 308 is rotated along a described direction (direction of the arrow E among Figure 10) around its axis.
The rotation of ratchet 308 around its axis along a described direction is delivered to drum 80 by first clutch spring 350.Drum 80 rotates along a direction around its axis, and tubular spare 38 rotates along coiling direction (direction of the arrow G among Figure 10), so spool 20 rotates along coiling direction.Like this, by with about the identical mode of the Motorized retractor 10 of above-mentioned first embodiment, ribbon 28 is winding on the spool 20 and is received (so-called " coiling auxiliary mechanism ").
When ribbon 28 is wound on the spool 20 fully, by ECU 142 and actuator 140 output shaft 50 (output gear 52) of motor 48 is stopped, thereby driven wheel 306 stop.When driven wheel 306 stopped, counterweight 334 was returned its center position with respect to driven wheel 306 (state shown in Figure 14) by the propelling thrust of torsion coil spring 342.Therefore, the driving projection 346 of counterweight 334 is moved away from the follower 327 of forward rotation with ratchet 314, and makes forward rotation external tooth 310 motions of the engaging piece 326 of ratchet 314 away from ratchet 308.Like this, driven wheel 306 is cancelled with ratchet 314 coupled condition with ratchet 308 by forward rotation, and the connection by engaged clutch 302 is cancelled between the output shaft 50 of spool 20 and motor 48 thereby make.Like this, can once more the ribbon 28 that is wound on the spool 20 be pulled out.
On the other hand, when automotive occupant began to apply ribbon 28, ECU 142 and actuator 140 made the output shaft 50 (output gear 52) of motor 48 rotate with first speed along inverse direction (around the other direction of axis, the direction of the arrow D among Figure 10).When output shaft 52 around axis when described other direction rotates, the driven wheel 306 of engaged clutch 302 (its external tooth 60 and output gear 52 engagements) rotates along other direction (direction of the arrow F among Figure 10) around its axis.
When driven wheel 306 around its axis when described other direction rotates, counterweight 334 is owing to inertia attempts to remain on situ.Therefore, driven wheel 306 rotates scheduled volume around its axis along described other direction with respect to counterweight 334.So, as shown in figure 16, when driving projection 346,348 respectively against the interior perimembranous of through hole 330,332, counterweight 334 is restricted with respect to relatively rotating of driven wheel 306, and counterweight 334 moves with respect to driven wheel 306 under the state of scheduled volume along a described direction from center position around axis therein, and counterweight 334 is rotated along other direction with driven wheel 306 around its axis.
Like this, counterweight 334 moves with respect to driven wheel 306 under the state of scheduled volume along a described direction from center position around axis therein, and the driving projection 348 of counterweight 334 is stepped up the follower 329 of backward rotation with ratchet 316.Like this, backward rotation is with the follower 329 of ratchet 316 movement outside towards the radial direction of driven wheel 306, and backward rotation is with the interior lateral movement towards the radial direction of driven wheel 306 of the engaging piece 328 of ratchet 316, and with external tooth 310 engagements of ratchet 308.Like this, the rotation of driven wheel 306 around its axis along described other direction is delivered to ratchet 308 by backward rotation with ratchet 316, thereby ratchet 308 rotates along other direction (direction of the arrow F among Figure 10) around its axis.
The rotation of ratchet 308 around its axis along described other direction is delivered to drum 80 by first clutch spring 350.Drum 80 rotates along other direction around its axis, and tubular spare 38 rotates along pull-out direction (direction of the arrow H among Figure 10), so spool 20 rotates along pull-out direction.Like this, the occupant of service vehicle pulls out ribbon 28, and therefore makes automotive occupant pull out ribbon 28 (so-called " pulling out auxiliary mechanism ") by slight power.
So, when automotive occupant makes the hyoplastron that is located at ribbon 28 places engage with buckle device, by ECU 142 and actuator 140 output shaft 50 of motor 48 is stopped, thereby driven wheel 306 stops.When driven wheel 306 stopped, counterweight 334 was returned its center position with respect to driven wheel 306 (state shown in Figure 14) by the propelling thrust of torsion coil spring 342.Therefore, the driving projection 348 of counterweight 334 is moved away from the follower 329 of backward rotation with ratchet 316, and makes backward rotation external tooth 310 motions of the engaging piece 328 of ratchet 316 away from ratchet 308.Like this, be cancelled by the coupled condition of backward rotation with ratchet 316 between driven wheel 306 and the ratchet 308, the connection by engaged clutch 302 is cancelled between the output shaft 50 of spool 20 and motor 48 thereby make.Therefore, spool 20 is by rotating along coiling direction relative to less turning effort with the propelling thrust of coil spring 44 is corresponding, thereby eliminates the lax of the ribbon 28 that is in the state of applying.
As mentioned above, in Motorized retractor 300, show and operation and substantially similar operation and the effect of effect about the Motorized retractor 10 of above-mentioned first embodiment about this 3rd embodiment.In addition, in Motorized retractor 300, the engaged clutch 302 that constitutes the first propulsive effort transmitting portions is to the rotation of spool 20 transmission along both direction, and the rotation of this both direction is the forward rotation and the backward rotation of the output shaft 50 of motor 48.Therefore, as mentioned above, can form two mechanisms, auxiliary mechanism and pull out auxiliary mechanism promptly reels.In addition, owing to can realize the rotation transmission of both direction by single engaged clutch 302 by this way, thereby can simplify the structure of engaged clutch 302 and make its compactness.Like this, can make this Motorized retractor 300 compactnesses, and can reduce its cost.

Claims (13)

1, a kind of Motorized retractor, this Motorized retractor comprises:
Spool, the ribbon that the constraint automotive occupant is used is wrapped on this spool, also can pull out from this spool thereby can be wound on this spool;
Motor;
Control part, this control part can switch at least two grades with the rotating speed of the output shaft of described motor, and these two grades are first speed and than the described first fireballing second speed;
The first propulsive effort transmitting portions, this first propulsive effort transmitting portions is located between described spool and the described output shaft, and be delivered to described spool than the rotation that reduces the described output shaft be in described first speed and with this rotation, thereby this spool is rotated along coiling direction with preset deceleration; And
The second propulsive effort transmitting portions, this second propulsive effort transmitting portions is independent of the described first propulsive effort transmitting portions and is located between described spool and the described output shaft, and reduce the rotation of the described output shaft that is in described second speed with the reduction ratio of the described preset deceleration ratio that is higher than the described first propulsive effort transmitting portions, and this rotation is delivered to described spool, thereby this spool is rotated along described coiling direction.
2, Motorized retractor according to claim 1, it is characterized in that, described control part always makes described output shaft rotate along a direction when driving described motor, and the described first propulsive effort transmitting portions with the described rotation of this output shaft is delivered to described spool with described first speed when described direction is rotated at described output shaft, and the described second propulsive effort transmitting portions with the described rotation of this output shaft is delivered to described spool with described second speed when a described direction is rotated at described output shaft.
3, Motorized retractor according to claim 1 is characterized in that, the described first propulsive effort transmitting portions has:
First clutch, when the described output shaft of described motor rotated, this first clutch connected described spool and described output shaft, thereby made and can rotate transmission between this spool and this output shaft; And
First free-wheeling mechanism, when under the coupled condition at described first clutch when described spool applies torque more than or equal to first setting value, described first free-wheeling mechanism cuts off described rotation transmission between described spool and the described output shaft by this torque, thereby this spool can be dallied relatively with this output shaft.
4, Motorized retractor according to claim 3, it is characterized in that, described first clutch is to have the engaged clutch of forward rotation with ratchet, described forward rotation is delivered to this forward rotation with ratchet by described output shaft and rotates with the rotation of ratchet, when described output shaft forward rotation, this forward rotation is delivered to this spool by meshing with described spool directly or indirectly with the forward rotation of this output shaft with ratchet, and stop or during backward rotation, described forward rotation is cancelled with the engagement of ratchet when described output shaft; And
Described first free-wheeling mechanism is the slide mechanism with first slide unit, described first slide unit rotates by the rotation that described output shaft is delivered to this first slide unit, this first slide unit is connected on the described spool directly or indirectly by friction force, and this spool can be rotated, and when the torque that applies to this spool more than or equal to described first setting value, this first slide unit overcomes described friction force and slides with respect to described spool.
5, Motorized retractor according to claim 4 is characterized in that, when described output shaft stopped, the described forward rotation of described engaged clutch was cancelled with the engagement of ratchet; And
Described engaged clutch has the backward rotation ratchet, this backward rotation with ratchet by with described spool engagement the backward rotation of this output shaft being delivered to described spool directly or indirectly when the described output shaft backward rotation, and this spool is rotated along pull-out direction, and this backward rotation is cancelled with the engagement of ratchet when this output shaft stops.
6, Motorized retractor according to claim 4 is characterized in that, described engaged clutch has:
Driven wheel, this driven wheel are connected on the described output shaft of described motor, and rotate by the rotation that this output shaft is delivered to this driven wheel, and support described forward rotation ratchet rotationally;
Ratchet, this ratchet are supported for and can freely rotate with respect to described driven wheel, and are connected to described first slide unit; And
Friction spring, this friction spring engages directly or indirectly with the framework that supports described spool, described friction spring is connected on the described ratchet, described driven wheel with the forward rotation of described output shaft when direction is rotated, this friction spring makes described forward rotation ratchet and described ratchet engaged, and described driven wheel with described output shaft stop or backward rotation stops or when other direction rotated, this friction spring made described forward rotation separate with described ratchet with ratchet; And
Described slide mechanism has drum, and this drum is supported for respect to described ratchet and freely rotates, and is connected on the spool, and this drum can rotate described spool, and keeps described first slide unit by described friction force.
7, Motorized retractor according to claim 5 is characterized in that, described engaged clutch has:
Driven wheel, this driven wheel are connected on the described output shaft of described motor, and rotate by the rotation that described output shaft is delivered to this driven wheel, and support described forward rotation rotationally with ratchet and described backward rotation ratchet;
Ratchet, this ratchet are supported for and can freely rotate with respect to described driven wheel, and are connected on described first slide unit; And
Inertia member, this inertia member is supported for and can rotates with respect to described driven wheel, and remain on predetermined center position place with respect to described driven wheel by being applied to propelling thrust on this inertia member, described driven wheel with the forward rotation of described output shaft when direction is rotated, described inertia member relatively rotates along other direction with respect to described driven wheel by overcoming described propelling thrust, make described forward rotation ratchet and described ratchet engaged, and described driven wheel with the backward rotation of described output shaft when other direction rotates, described inertia member relatively rotates along a direction with respect to described driven wheel by overcoming described propelling thrust, makes described backward rotation ratchet and described ratchet engaged; And
Described slide mechanism has drum, and this drum is supported for respect to described ratchet and freely rotates, and is connected on the described spool, and this drum can rotate this spool, and keeps described first slide unit by described friction force.
8, Motorized retractor according to claim 1, it is characterized in that, the described second propulsive effort transmitting portions has second clutch, when the described output shaft of described motor rotates with described second speed, this second clutch connects described spool and described output shaft, thereby can rotate transmission between this spool and this output shaft.
9, Motorized retractor according to claim 8, it is characterized in that, described second clutch is the centrifugal clutch with counterweight, described counterweight is rotated by the rotation that described output shaft is delivered to this counterweight, and when this output shaft when rotating more than or equal to the speed of described second speed, described counterweight is owing to the centnifugal force that is applied on it moves, and engage with described spool directly or indirectly, thereby connect described output shaft and described spool, and stop or when rotating less than the speed of described second speed, the engagement state of described counterweight and described spool is cancelled when described output shaft.
10, Motorized retractor according to claim 1, it is characterized in that, the described second propulsive effort transmitting portions has second free-wheeling mechanism, the rotation of described output shaft therein just is being passed under the state of described spool, when the torque that applies to described spool more than or equal to second setting value, this second free-wheeling mechanism cuts off rotation transmission between described spool and the described output shaft by this torque, thereby this spool can be dallied relatively with this output shaft.
11, Motorized retractor according to claim 10, it is characterized in that, described second free-wheeling mechanism is the overload mechanism with second slide unit, described second slide unit rotates by the rotation that described output shaft is delivered to this second slide unit, and pass through friction force directly or indirectly with respect to described spool connection, thereby this spool can be rotated, and when the torque that applies to described spool more than or equal to described second setting value, described second slide unit overcomes described friction force and slides with respect to described spool.
12, Motorized retractor according to claim 1 is characterized in that,
The described second propulsive effort transmitting portions has:
Second clutch, when the described output shaft of described motor rotated with described second speed, this second clutch connected this spool and this output shaft, thereby made and can rotate transmission between described spool and described output shaft; And
Second free-wheeling mechanism, when under the coupled condition at described second clutch when described spool applies torque more than or equal to second setting value, this second free-wheeling mechanism cuts off rotation transmission between described spool and the described output shaft by described torque, thereby this spool can be dallied relatively with this output shaft; And
Described second clutch is the centrifugal clutch with counterweight, described counterweight is rotated by the rotation that described output shaft is delivered to this counterweight, and when described output shaft when rotating more than or equal to the speed of described second speed, described counterweight is owing to the centnifugal force that is applied on it moves, and engage with described spool directly or indirectly, thereby connect described output shaft and described spool, and stop or when rotating less than the speed of described second speed, the engagement state of described counterweight and described spool is cancelled when described output shaft; And
Described second free-wheeling mechanism is the overload mechanism with second slide unit, described second slide unit rotates by the rotation that described output shaft is delivered to this second slide unit, and pass through friction force directly or indirectly with respect to described spool connection, thereby this spool can be rotated, and when the torque that applies to described spool more than or equal to described second setting value, described second slide unit overcomes described friction force and slides with respect to described spool; And
Described overload mechanism has:
Intermediate gear, it is connected on the described output shaft of described motor, and rotates by the rotation that described output shaft is delivered to this intermediate gear, and described second slide unit is anchored on this intermediate gear; And
Adapter, it is supported for and can rotates with respect to described intermediate gear, and keeps described second slide unit by described friction force; And
Described centrifugal clutch has:
Rotor, this rotor is connected on the described adapter, and this adapter can be rotated, and supports described counterweight and make this counterweight radially to move;
Push mechanism, this push mechanism promotes described counterweight towards the inboard of the radial direction of described rotor; And
Gear, it is supported for respect to described rotor and described counterweight and freely rotates, and be connected on the described spool, thereby this spool can be rotated, and when described rotor rotates with the rotation more than or equal to described second speed of described output shaft, because described counterweight overcomes the propelling thrust of described push mechanism and towards the movement outside of the radial direction of rotor described gear is connected on the described rotor by centnifugal force by described counterweight.
13, Motorized retractor according to claim 6 is characterized in that, is provided with a gear between the described output shaft of described driven wheel and described motor, thereby the rotation of this output shaft is delivered to this driven wheel.
CNB2006101513518A 2005-09-07 2006-09-07 Motorized retractor Expired - Fee Related CN100469623C (en)

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JP2005259013 2005-09-07
JP2005345621 2005-11-30

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CN101274615B (en) * 2007-03-30 2011-06-22 高田株式会社 Seat belt retractor, seat belt apparatus, and seat belt winding method
CN102039869A (en) * 2009-10-20 2011-05-04 株式会社东海理化电机制作所 Webbing take-up device
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CN103213553A (en) * 2012-01-20 2013-07-24 德昌电机(深圳)有限公司 Safety belt tongue plate driver
CN115279630A (en) * 2020-03-24 2022-11-01 株式会社东海理化电机制作所 Safety belt winding device
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CN113781909A (en) * 2021-08-27 2021-12-10 上海天马微电子有限公司 Display screen device

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