CN118025067A - Electronic car feel type safety belt retractor assembly - Google Patents

Abstract

The invention provides an electronic car feel type safety belt retractor assembly, which comprises a belt winding drum arranged in a frame; a locking device configured to lock the webbing take-up drum in a pull-out direction of the webbing; a tape feel assembly having ratchet teeth arranged to drive a locking means to lock the tape cartridge when the ratchet teeth are engaged; an electromagnetic switch having a pawl which is acted upon by a spring force or a magnetic force in the opposite direction of engagement with the ratchet teeth; a return assembly having a hold down spring; and a suppression spring which limits the hold-down spring when the take-up drum rotates in the webbing pull-out direction, and releases the hold-down spring when the take-up drum rotates in the opposite direction to the webbing pull-out direction; when the return assembly is in the unlocking position and the restraining spring is in a position for releasing the pressing spring, the pressing spring is in pressing fit with the pawl, so that the pawl rotates to a position engaged with the ratchet. The electronic car feel type safety belt retractor assembly realizes the first wearable function of the electronic car feel type safety belt when the electronic car feel type safety belt is not electrified.

Description

Electronic car feel type safety belt retractor assembly

Technical Field

The invention relates to the field of automobile safety belts, in particular to an electronic automobile sense type safety belt retractor assembly which realizes the functions of vehicle safety, restraint system and passive safety.

Background

Along with continuous electronization and intellectualization of automobiles, the traditional mechanical automobile sensing retractor can not meet the requirements of all clients, and the electronic automobile sensing retractor is a necessary development trend of safety belts. For safety reasons, the safety belt should be locked in the event of a power outage of the vehicle. This requirement also causes a problem that the seat belt cannot be worn when the vehicle is not energized after the occupant gets on the vehicle.

The safety requirement of the vehicle and the requirement of being capable of wearing a safety belt when the vehicle is not electrified are considered by realizing the function of being capable of being worn for the first time when the vehicle is not electrified in the current industry.

For example, patent CN112969616a filed in 2019 discloses an electronic car feel retractor with a first wearable function, which discloses an ECL lock lever and an LC lock lever for simultaneously locking a car sensitive pawl.

Wherein, when the webbing is pulled out but the pull-out length is within the set length: the ECL locking rod and the LC locking rod simultaneously lock the vehicle-sensitive pawl to enable the vehicle-sensitive pawl to be pulled out normally; when the pull-out length of the webbing exceeds the set length: the ECL lock lever continues to lock the vehicle sensitive pawl, the LC lock lever changes state, disengages from the vehicle sensitive pawl (i.e., moves to a position where the vehicle sensitive pawl is not locked), and prelock the ELC lock lever. When a section of webbing is recovered after wearing the seat belt: the tape winding shaft drives the ECL locking rod to rotate reversely so as to unlock the vehicle-sensitive pawl, and the LC locking rod locks the ELC locking rod. However, the above device requires a large number of lock levers, and the structure is complicated.

The prior art also discloses an electronic car feel type safety belt retractor which also solves the problem that a safety belt can still be worn under the conditions of flat seat placement and the like when a host factory loads. The automatic control device comprises a mechanical housing fixed relative to a frame, a winding drum, NHOM discs, a counting gear mechanism, an electromagnetic switch and a pawl, wherein the winding drum is wound with a braid (namely a safety belt), the pawl is an actuating mechanism of a vehicle sensing function, when the pawl can swing normally relative to the electromagnetic switch, the vehicle sensing function is normal, and when the pawl is locked relative to the electromagnetic switch, the vehicle sensing function is inhibited, so that the winding drum is locked. The pawl is locked and unlocked through the return assembly to control the opening and closing of the vehicle angular sense suppression function. The boss of the counting gear mechanism is axially inserted into the special-shaped hole of the NHOM disk, and the boss is higher than the NHOM disk, so that the special-shaped hole of the NHOM disk is driven to rotate when the boss moves, and the NHOM disk is rotated. The NHOM disk has two kinds of outer circle portions of different diameters, namely, a large diameter outer circle portion and a small diameter outer circle portion, both of which have outer wall surfaces.

The return component is provided with a shaft hole, and is in pivot connection with a rotating shaft of the inner end face of the mechanical housing through the shaft hole, so that the return component can rotate around the rotating shaft. The return subassembly has from the shaft hole extension return body of rod, from the return body of rod to the axle center direction extension of winding section of thick bamboo and with NHOM the outer wall face of dish support and lean on complex abutment arm and locate the return body of rod keep away from the one end in shaft hole and with pawl complex push down spring for return subassembly does not take place to rotate when the abutment arm keeps leaning on with round outer wall face, when NHOM dish moves to the minor diameter excircle portion by the major diameter excircle portion, the abutment arm can support on the major diameter excircle portion of KISI dish, thereby release pawl.

Thereby, the following functions are achieved:

vehicle feel suppression function: the large-diameter outer circle part of NHOM discs downwards limits the return assembly, and the downward pressing spring of the return assembly presses down the pawl so as to lock the pawl.

Eliminating the vehicle feel inhibiting function: the small diameter outer circular part of NHOM discs limit the return assembly, so that the return assembly rotates upwards relative to the condition when the return assembly is propped against the large diameter outer circular part of NHOM discs, and the pressing spring of the return assembly is not contacted with the pawl any more, so that the pawl is unlocked.

Judging the pull-out length function: when the counting gear mechanism rotates anticlockwise for a circle, the boss rotates clockwise for a small angle, and the counting gear mechanism rotates along with the drawing of the braid.

By the above three function combinations, when the webbing is pulled out to be less than the set length, the counting gear mechanism boss drives the NHOM disc to rotate, but the abutting arm of the return component still abuts against the outer wall surface of the large-diameter outer circle part of the NHOM disc after rotation, the return component is limited downwards by the large-diameter outer circle part of the NHOM disc, and the pawl is pressed downwards by the pressing spring so as to lock the pawl and inhibit the function of feeling a car.

When the webbing is pulled out to exceed the set length, the boss of the counting gear mechanism drives the NHOM disc to rotate, the abutting arm of the return assembly still abuts against the small-diameter outer circle part of the NHOM disc after rotation, the return assembly is limited by virtue of the small-diameter outer circle part, and the pressing spring of the return assembly is not contacted with the pawl any more, so that the pawl is unlocked, and the function of inhibiting the feel of a car is eliminated.

The above-mentioned prior art can realize that the retractor can pull out the function in setting for meshbelt length, however directly adopts above-mentioned prior art and can bring two problems: if the length of the webbing is set too long, the feeling of the vehicle is suppressed after the occupant wears the webbing. If the set length is too short, the occupant will not pull out the seat belt when not wearing it.

Disclosure of Invention

The invention aims to provide an electronic car feel type safety belt retractor assembly, which is used for realizing the wearable function of an electronic car feel type safety belt when an occupant gets on the car and is not electrified. As NHOM can only be freely pulled out in the set webbing pull-out length, the safety belt cannot be locked by the car corner sense in the set length, and great potential safety hazard is brought. The invention needs to improve the comfort and safety of passengers.

In order to achieve the above object, the present invention provides an electronic vehicular seat belt retractor assembly comprising: a tape drum rotatably mounted in the frame, on which a webbing is wound; a locking device configured to lock the webbing take-up drum in a pull-out direction of the webbing; a tape feel assembly having ratchet teeth arranged to drive a locking means to lock the tape cartridge when the ratchet teeth are engaged; an electromagnetic switch having a pawl; and a return assembly having a hold down spring; the pawl is acted by spring force or magnetic force in the opposite direction of the engagement with the ratchet teeth; the return assembly is arranged at an unlocking position when the pulling-out length of the webbing exceeds a set value; the retractor assembly further comprises a suppression spring, wherein the suppression spring is used for locking the down-pressing spring when the winding drum rotates along the drawing direction of the webbing, and releasing the down-pressing spring when the winding drum rotates along the opposite direction of the drawing direction of the webbing; when the return assembly is in the unlocking position and the pressing spring is released, the pressing spring is in pressing fit with the pawl so that the pawl rotates to a position meshed with the ratchet, and otherwise, the pressing spring is separated from the pawl so that the pawl is located at a position not meshed with the ratchet.

The suppression spring is swingable between a lock angle and an unlock angle, abuts against the hold-down spring to provide a driving force to lock the hold-down spring when the suppression spring is in the lock angle, and is separated from the hold-down spring to be in a position to release the hold-down spring when the suppression spring is in the unlock angle.

The swingable part of the restraining spring is a clamping hook structure, and the pressing spring is an elastic bending structure.

The method comprises the steps that metering of the webbing pull-out length is achieved in the form of a counting gear mechanism coupled with the take-up shaft, the counting gear mechanism judges whether the webbing pull-out length exceeds a set value or not and controls movement of a conversion device according to a judging result, the conversion device releases a return assembly to be located at a first locking position when the webbing pull-out length is smaller than the set value, and the return assembly is limited at an unlocking position when the webbing pull-out length exceeds the set value and a restraining spring is located at an unlocking angle; when the return assembly is in the first locking position, the return assembly is in a position in which the pressing spring is separated from the pawl and does not engage with the ratchet.

The counting gear mechanism comprises an annular tooth part driven by the rotating shaft of the belt winding drum, wherein the annular tooth part is eccentrically arranged relative to an annular corresponding tooth part, and circumferentially rolls on the corresponding tooth part in the rotating process of the rotating shaft of the belt winding drum, so that the corresponding tooth part is driven to perform decelerating rotation.

A boss for driving the conversion device to move is arranged on the counting gear mechanism;

The conversion device includes: NHOM discs, wherein the NHOM discs are provided with large-diameter outer circle parts and small-diameter outer circle parts with the same circle center positions; the NHOM disc is positioned at the position of the small-diameter outer circular part of the NHOM disc, which is aligned with the abutting part of the return assembly, when the webbing pull-out length is smaller than a set value, and when the webbing pull-out length exceeds the set value and does not reach a second set value, the boss on the counting gear mechanism is rotated to the position of the large-diameter outer circular part of the NHOM disc, which is aligned with the abutting part of the return assembly; the return assembly is in an unlocking position when being abutted against the large-diameter outer circular part of NHOM; and/or KISI discs, wherein the KISI discs are provided with large-diameter outer circle parts and small-diameter outer circle parts with different concentric diameters, and the KISI discs rotate to the position of the large-diameter outer circle part of the KISI disc aligned with the abutting part of the return assembly by means of the boss on the counting gear mechanism when the webbing is pulled out to a length smaller than a second set value in the webbing pulling-out process, and rotate to the position of the small-diameter outer circle part of the KISI disc aligned with the abutting part of the return assembly by means of the boss on the counting gear mechanism when the webbing is pulled out to the second set value; the return assembly is in a first locking position when the return assembly is abutted against the large-diameter outer circular part of the KISI disc; wherein, when the conversion device only includes KISI discs, KISI discs still include the big diameter excircle portion of big diameter that is the same as the centre of a circle position of the big diameter excircle portion and the little diameter excircle portion of KISI discs, KISI discs are in when the meshbelt pull-out length surpasses the setting and does not reach the second setting the second big diameter excircle portion of KISI discs aligns the position of the portion of leaning on of return subassembly, the diameter of the big diameter excircle portion of KISI discs is greater than the big diameter excircle portion of KISI discs, return subassembly is in the unblock position when leaning on the big diameter excircle portion of NHOM.

The conversion device at least comprises a KISI disc, and the return assembly is in a second locking position when the return assembly is abutted against the small-diameter outer circular part of the KISI disc; the return assembly has a release block that is in a position to engage the ratchet teeth by a tooth of its release block when the return assembly is in the second, locked position, so that the retractor assembly switches from ELR function to ALR function.

Be equipped with on KISI dish with counting gear's boss complex dysmorphism hole, KISI dish has at dysmorphism hole department with boss extrusion fit's first arris and with first arris relative and with boss extrusion fit's second arris in meshbelt recovery process, first arris and second arris are located dysmorphism hole is at the both ends in length direction, dysmorphism hole is greater than in length direction's size the boss, make dysmorphism hole's length corresponds to the meshbelt and retrieves to the required recovery meshbelt length when the coiler assembly switches and leaves the ALR function from second setting value department.

The electronic car feel type safety belt retractor assembly further comprises an eccentric cam coupled with the rotating shaft of the belt feel assembly, and one end of the restraining spring is in friction interference fit with the eccentric cam.

The electromagnetic switch does not have a vehicle-sensing locking function when not worn, the pawl of the electromagnetic switch is closed by means of spring force or magnetic force at a position where the belt-sensing assembly is not locked, after the electromagnetic switch is worn, the spring is restrained from reversing, the spring is restrained from releasing the pressing spring, and the electromagnetic switch has a vehicle-sensing function, so that the first wearable function of the electronic vehicle-sensing safety belt when not electrified is realized.

Drawings

Fig. 1 is a schematic overall structure of an electronic vehicular seat belt retractor assembly according to an embodiment of the present invention.

Fig. 2 is an exploded view of the electronic vehicular seat belt retractor assembly of fig. 1.

Fig. 3A and 3B are internal structural views of the electronic-vehicle-feel seatbelt retractor assembly when an occupant just pulls out the webbing, wherein fig. 3A shows the front side and fig. 3B shows the rear side.

Fig. 4A and 4B are internal structural views of the electronic vehicular sense type seatbelt retractor assembly when an occupant pulls out a webbing and the amount of webbing pulled out exceeds a set length, wherein fig. 4A shows a front face and fig. 4B shows a rear face.

Fig. 5A and 5B are internal structural views of the electronic vehicular seat belt retractor assembly when a small recovery of webbing occurs after the seat belt is worn, wherein fig. 5A shows the front side and fig. 5B shows the rear side.

Fig. 6 is a schematic structural view of an eccentric cam of the electronic vehicular seat belt retractor assembly of the present invention.

Detailed Description

The invention will be further illustrated with reference to specific examples. It should be understood that the following examples are illustrative of the present invention and are not intended to limit the scope of the present invention.

Fig. 1 and 2 show an electronic car feel seatbelt retractor assembly according to a first embodiment of the present invention, which is mainly directed to a first wearable function, and is used for realizing the first wearable function of an electronic car feel seatbelt when not energized, and solving the problem that a webbing length is set too short to pull out on the premise of ensuring safety, that is, on the premise of not increasing the webbing length. Compared with the prior art, the invention has the core principle that the safety belt has no vehicle-feel locking function before wearing, and the vehicle-feel locking function is endowed to the safety belt by rotating the pawl to the ratchet engaged position after the passenger wears the safety belt.

As shown in fig. 1 and 2, the retractor assembly includes a frame 130 disposed on a vehicle body and having first and second openings 131 and 132 at both sides thereof, a mechanical housing 10 and a coil spring assembly 150 fixedly installed at both sides of the frame 130 with snap-rivet pins, and a tape cartridge 140 rotatably installed in the frame 130 by being engaged with central holes of the mechanical housing 10 and the coil spring assembly 150 through a rotation shaft. The webbing is wound around the spool 140 so as to be able to be pulled out as a seat belt; the coil spring assembly 150 is configured to provide a rotational force to the spool 140 for retrieving webbing so that webbing wound on the spool can be retrieved after being pulled out, controlling the pull-back force.

Wherein the mechanical housing 10 is disposed outside the first opening 131, the coil spring assembly 150 is disposed outside the second opening 132, and the planes of the mechanical housing 10 and the first opening 131 of the frame 130 together define a cavity defined by the tape cartridge 140 and the frame 130.

KISI discs 20, NHOM disc 30, counter gear mechanism 40, eccentric cam 50, hold down spring 60, return component 80 and tape feel assembly 100 are disposed in the cavity defined by the tape cartridge 140 and the frame 130. Wherein the KISI discs 20, NHOM disc 30, the counter gear mechanism 40, the eccentric cam 50 and the tape inductance assembly 100 each have a shaft hole that mates with the rotation shaft of the tape spool 140, so that these components can all rotate around the rotation shaft of the tape spool 140, so that the eccentric cam 50 is coupled with the rotation shaft of the tape inductance assembly 100. The eccentric cam 50 is axially matched with the mechanical housing 10 through a snap fit, KISI discs 20, NHOM discs 30 and a counting gear mechanism 40 shaft hole are matched on the mechanical housing 10, so that the NHOM discs 30 are axially limited to the KISI discs 20, the counting gear mechanism 40 is axially limited to the NHOM discs 30, and the eccentric cam 50 is axially limited to the counting gear mechanism 40.

In other embodiments, KISI discs 20, NHOM disc 30, counter gear mechanism 40, eccentric cam 50, hold down spring 60, return assembly 80, and tape feel assembly 100 described above may be disposed at other locations, such as outside of the cavity formed by tape cartridge 140 and frame 130.

The electromagnetic switch 90 is disposed in the radial direction of the tape cartridge 140, i.e., radially outward of the tape cartridge 140. In this embodiment, the bottom of the frame 130 has a receiving groove, and the bottom of the mechanical housing 10 has a fastening frame, and the electromagnetic switch 90 is disposed in the receiving groove and fixedly connected with the fastening frame through a fastener, so that the electromagnetic switch 90 is fixedly mounted on the mechanical housing 10, and neither the mechanical housing 10 nor the electromagnetic switch 90 rotates relative to the frame 130.

The electromagnetic switch 90 includes an electromagnet, a magnet mount for accommodating the electromagnet, and a pawl 91 provided above the electromagnet and having one end hinged to the magnet mount, and the electromagnet is configured to provide the pawl 91 with electromagnetic force in a direction opposite to the engagement direction of the ratchet teeth when energized.

In addition, the electromagnetic switch 90 further includes a permanent magnet accommodated in the magnet mount, or a pawl tension spring connected to the pawl 91, both ends of the pawl tension spring being connected to the magnet mount and the pawl 91, respectively. The permanent magnet and the pawl tension spring are respectively configured to provide a magnetic force and a spring force to the pawl 91 in opposite directions to engage the ratchet teeth, and thus the pawl 91 is subjected to the spring force or the magnetic force in opposite directions to engage the ratchet teeth of the tape inductance assembly 100. Thus, the pawl 91 is forced in the opposite direction to the ratcheting engagement of the tape feel assembly 100 and is thus in a locked state by spring force/magnetic force when not acted upon by the return assembly 80. The locked state of the pawl 91 means that the pawl 91 is fixed at a position not engaged with the ratchet even though it is not affected by electromagnetic force of the electromagnet, for example, the pawl 91 is closed to be fixed to the electromagnet, so that it has no vehicle-feel locking function, and the webbing can be normally pulled out.

The pawl 91 may be in an unlocked state in other cases, which will be described later, in which the pawl 91 is opened to engage with the ratchet teeth without being subjected to electromagnetic force of the electromagnet, so that the pawl 91 can be normally swung (i.e., opened or closed) by the electromagnetic force, and the vehicle-feel locking function is normal.

The electromagnetic switch 90 functions to provide an electronic feel function when the pawl 91 is in the unlocked state. That is, the tape inductance assembly 100 is configured to lock the tape cartridge 140 by engagement of the pawl 91 with the ratchet teeth of the tape inductance assembly 100 when the pawl 91 is opened, and to rotate synchronously with the tape cartridge 140 when the pawl 91 is closed.

Specifically, a follower column 141 inserted in the first opening 131 and having a notch is disposed on an end surface of the tape cartridge 140 facing the machine housing 10, and a locking device, preferably in the form of a locking claw 120, configured to lock the tape cartridge 140 in the direction of pulling out the webbing is accommodated in the notch of the follower column 141. The locking claw 120 has a thickness substantially equal to the depth of the notch of the follower column 141, has locking teeth that mate with teeth of the frame 130 at the edge of the first opening 131, and is provided with a drive shaft 121 extending in a direction away from the tape cartridge 140.

Meanwhile, the belt sensing assembly 100 is provided with a waist-shaped hole (preferably a waist-shaped hole with radian), and the driving shaft 121 is inserted into the waist-shaped hole, so that the belt sensing assembly 100 is driven to rotate along with the locking claw 120 through the cooperation of the driving shaft 121 and the waist-shaped hole.

The drive shaft 121 is switchable between a first position and a second position of the kidney-shaped aperture such that the locking pawl 120 is switchable between an unlocked state and a locked state. When the driving shaft 121 is at the first position of the waist-shaped hole, the locking claw 120 is located at a position close to the rotating shaft of the tape cartridge 140, and the locking claw 120 is in an unlocked state, that is, the locking teeth of the locking claw 120 are spaced from the teeth of the frame 130 at the edge of the first opening 131, so that the locking claw 120 can be matched with the tape cartridge 140 in a form-fitting manner by means of the contour, and can freely rotate along with the tape cartridge 140, thereby driving and rotating the tape sensing assembly 100 along with the tape cartridge 140, and enabling the tape cartridge 140 and the tape sensing assembly 100 to jointly rotate. When the driving shaft 121 is at the second position of the waist-shaped hole, the locking claw 120 is located at a position far away from the rotating shaft of the winding drum 140, and the locking claw 120 is in a locking state, that is, the locking teeth of the locking claw 120 are in contact fit with the teeth of the frame 130 at the edge of the first opening 131 to be locked by mutual clamping, so that the locking claw 120 is fixed by the frame 130, and the winding drum 140 is correspondingly locked because the locking claw 120 can be matched with the winding drum 140 by means of profile.

The assembly 100 and the locking claw 120 are further connected by a return spring 110, one end of the return spring 110 is fixed to the assembly 100 by a snap-fit manner, and the other end is fixed to a driving shaft 121 of the locking claw 120. The return spring 110 is arranged to provide a force that keeps the locking pawl 120 in the unlocked state, i.e. a force that keeps the locking pawl 120 in the first position of the kidney-shaped aperture. Thus, the present invention realizes the locking function by the cooperation among the locking claw 120, the tape cartridge 140, and the return spring 110.

The tape sensing assembly 100 includes a ratchet 101 having ratchet teeth provided on an outer wall surface thereof, so that the tape sensing assembly 100 has ratchet teeth. The tape inductance assembly 100 is configured such that when the pawl 91 is engaged with the ratchet teeth (i.e., when the pawl 91 is opened), the ratchet teeth on the ratchet wheel are engaged with the pawl 91 to drive the tape inductance assembly 100 to lock so as not to rotate, and then drive the locking device to lock the tape cartridge 140. Specifically, when the spool 140 rotates in the webbing pulling direction and the ratchet 101 is locked, the spool 140 rotates the locking device in the form of the locking pawl 120, and further drives the driving shaft 121 of the locking pawl 120 to move from the first position to the second position of the waist-shaped hole against the force of the return spring 110, so that the locking device in the form of the locking pawl 120 is pulled radially outwards to switch to the locked state. Further, the tape inductance assembly 100 is configured to rotate synchronously with the tape bobbin 140 when the pawl 91 contacts the electromagnet, specifically, when the ratchet 101 is normally rotatable, the return spring 110 keeps the locking claw 120 in the unlocked state, the locking claw 120 is fitted in the notch of the follower post 141 of the tape bobbin 140 and fixed by means of the return spring 110, and the tape inductance assembly 100 is rotated with the tape bobbin 140, so that both the tape bobbin 140 and the tape inductance assembly 100 are rotated synchronously.

Thus, the electromagnetic switch 90 realizes a function of providing an electronic feeling of a vehicle when the pawl 91 is in the unlocked state.

The return assembly 80 is located between the axis of rotation of the spool 140 and the electromagnetic switch 90. The return assembly 80 includes a hold down spring 84 that engages a pawl 91.

The return assembly 80 is configured to: when the webbing pullout length is less than the set value, the return member 80 is in a released state so as to be in the first locking position, and at this time, the pawl 91 is not pressed by the return member 80 so as to be in the locking state, i.e., the pawl 91 is kept in the above-described position of not engaging with the ratchet teeth of the webbing sense assembly 100; and when the webbing pullout length exceeds a set value, the return assembly 80 is limited to the unlocking position; when the return assembly 80 is in the unlocked position (and the hold down spring 60 is in a position to release the hold down spring 84 as described below), the hold down spring 84 is in press fit with the pawl 91 to rotate the pawl 91 into engagement with the ratchet teeth, such as by the pressing of the hold down spring 84 to expand the pawl 91 into engagement with the ratchet teeth; otherwise, the pawl 91 is not pressed by the return assembly 80 and is thus in the locked state, i.e., the pawl 91 is maintained in the above-described position of not engaging the ratchet teeth of the tape feel assembly 100, such as the pawl 91 being closed to be fixed to the electromagnet. It should be noted that the set value is a variable value, not a fixed value, and it is adjusted according to different items. In the present embodiment, when the return member 80 is in the first locking position, it is in a position where the pressing spring 84 and the pawl 91 are not pressed against each other and are not engaged with the ratchet itself. The return assembly 80 is provided with an axle bore 81 which is pivotally connected to the axle at the edge of the machine housing 10 by the axle bore 81 so that the return assembly 80 is rotatable. In addition, the return assembly 80 further includes a return lever 82 extending from the shaft hole 81, an abutment arm 83 extending from the return lever 82 in the direction in which the tape cartridge is located, and a pressing spring 84 engaged with the pawl 91, and the return assembly 80 abuts against the large-diameter outer circumferential portion 31 of the NHOM disk 30 through the abutment arm 83 and aligns with the large-diameter outer circumferential portion 24 of the KISI disk 20, the large-diameter outer circumferential portion 31 of the nhom disk 30, and the large-diameter outer circumferential portion 24 of the KISI disk 20, as will be described in detail below. Wherein, the push down spring 84 cooperates with the shaft hole 81 and the push down spring 84 cooperates with the return rod 82 of the return assembly 80 and extends to one end of the return rod 82 far away from the shaft hole 81, the other end of the push down spring 84 cooperates with the shaft hole 81 is a spiral part 86, the spiral part 86 has a spiral part tail end 87 cooperating with the inner wall of the mechanical housing, providing a resilience force for returning the return assembly 80 when releasing (i.e. switching from the unlocking position to the first locking position or switching from the unlocking position to the second locking position), the return assembly 80 is further provided with a release block 85, in this embodiment, the release block 85 is disposed on the return rod 82 far away from the shaft hole 81 of the return assembly 80.

The suppression spring 60 is provided with: when the tape drum rotates in the pulling-out direction of the webbing, the position of the pressing-down spring 84 is limited, for example, the pressing-down spring 84 is hooked, and at this time, the pawl 91 is positioned at a position not engaged with the ratchet teeth because the pawl 91 is subjected to a force for driving the pawl 91 to close; the coil bobbin is in a position to release the pressing spring when rotated in the opposite direction to the webbing pulling-out direction, and at this time, if the return member 80 is in the unlocking position, the pawl is rotated to a position to engage with the ratchet teeth of the webbing inductance assembly 100 by the downward pressing of the pressing spring 84, and at this time, the ELR (EMERGENCY LOCKING RETRACTOR, emergency lock retractor) function is realized, that is, the coil bobbin can be locked by driving the locking device to engage with and disengage from the ratchet teeth when the pawl 91 of the electrically driven electromagnetic switch 90 is engaged with the ratchet teeth. One end of the suppression spring 60 is friction interference fit on the eccentric cam 50, specifically, one end of the suppression spring 60 is friction interference fit with the hollow cylindrical portion of the eccentric cam 50, so that the suppression spring 60 is swingable around the eccentric cam 50 and receives the same friction force as the rotation direction of the take-up drum 140. The mechanical housing 10 is provided with a limit groove, the limit groove is located between the release block of the return assembly 80 and the rotating shaft of the winding drum 140, and the middle section of the inhibiting spring 60 is inserted into the limit groove, so that the inhibiting spring 60 is limited to be capable of swinging only between a locking angle and an unlocking angle (in this embodiment, the two sides of the groove are limited to 5 degrees, and the included angle between the locking angle and the unlocking angle is 10 degrees). The hold-down spring 60 is in a position to limit the hold-down spring 84 when it is at the lock angle, i.e., the swingable portion of the hold-down spring 60 hooks the hold-down spring 84 to prevent it from coming into contact with the pawl 91; the swingable portion and the pawl 91 thereof are separated from each other when the suppression spring 60 is at the unlocking angle, so that the suppression spring 60 is at a position to release the pressing spring 84. The swing direction of the unlock angle to the lock angle is the same as the rotation direction of the tape cartridge 140. In addition, the swingable portion of the suppressing spring 60 has a hook structure, and the pressing spring 84 has an elastic bending structure, so that the suppressing spring 60 is convenient to hook and limit the pressing spring 84.

In the present invention, the metering of the webbing pull-out length is realized in the form of a counter gear mechanism 40 coupled to the take-up spool, the counter gear mechanism 40 judges whether the webbing pull-out length exceeds a set value and controls the movement of a switch device according to the judgment result, the switch device releases the return assembly 80 to be located at the first locking position when the webbing pull-out length is smaller than the set value, and limits the return assembly 80 to be in the unlocking position when the webbing pull-out length exceeds the set value. In this embodiment, the counter gear mechanism 40 includes an annular tooth driven by the rotating shaft of the take-up drum, the annular tooth being arranged eccentrically with respect to a corresponding tooth of the annular shape and rolling circumferentially on the corresponding tooth during rotation of the rotating shaft of the take-up drum, thereby driving the corresponding tooth to perform a decelerating rotational movement.

Further, an eccentric cam 50 is included, the annular tooth portion is cooperatively connected with the eccentric portion of the eccentric cam 50, and the eccentric cam 50 is coupled with the rotation shaft of the tape inductance assembly 100, so that the annular tooth portion is driven by the rotation shaft of the tape cartridge. Thereby, the rotation of the take-up drum drives the eccentric cam 50 to rotate synchronously, and converts the rotation of the eccentric cam 50 into the reverse rotation smaller than the rotation angle of the eccentric cam 50, the conversion means being synchronized with the reverse rotation of the counter gear mechanism 40. The counting gear mechanism 40 is provided with a boss 41 for driving the conversion device to move, and the boss 41 is positioned on the corresponding tooth part.

In this embodiment, the counter gear 40 is preferably a small-tooth-difference planetary gear, the rotation direction of the boss 41 is opposite to the rotation direction of the counter gear 40 and the rotation angle is smaller than the rotation angle of the counter gear 40 (i.e. each counter-clockwise rotation of the counter gear 40, the boss 41 rotates clockwise by a small angle), so that the boss 41 provides the counter rotation, and the boss 41 of the counter gear 40 is inserted into the shaped hole of the conversion device in the axial direction. Therefore, when the eccentric cam 50 rotates along with the movement direction of the winding drum 140, the outline of the eccentric part of the eccentric cam 50 drives the counting gear mechanism 40 to eccentrically rotate, so that the boss 41 reverses the angle relative to the movement direction of the winding drum 140, and the boss 41 drives the conversion device to jointly rotate.

The conversion means comprises a NHOM disc 30 and/or a KISI disc 20, the nhom disc 30 being adapted to perform the NHOM (Noise hold on mechanics, noise control mechanism) function while determining the webbing pull-out length, and the KISI disc 20 being adapted to perform the KISI (child-resistant) function while determining the webbing pull-out length. In this embodiment, the switching device includes both NHOM discs 30 and KISI discs 20. The NHOM disk 30 and the KISI disk 20 each have outer circular portions of two different diameters with the same center position, namely, the NHOM disk 30 has a large-diameter outer circular portion 31 and a small-diameter outer circular portion 31 of the NHOM disk 30, the KISI disk 20 has a large-diameter outer circular portion 24 and a small-diameter outer circular portion 25 of the KISI disk 20, and the large-diameter outer circular portion and the small-diameter outer circular portion each have an outer wall surface.

The NHOM disc 30 is in the position where the small diameter outer circular portion of the NHOM disc 30 is aligned with the abutment portion of the return assembly 80 when the pull-out length of the webbing is less than the set value, and is rotated by means of the boss 41 on the counter gear mechanism 40 to the position where the large diameter outer circular portion 31 of the NHOM disc 30 is aligned with the abutment portion of the return assembly when the return assembly 80 is abutted against the large diameter outer circular portion 31 of the NHOM disc 30, the return assembly 80 being in the unlocked position (i.e., swung down to the unlocked position) when the return assembly 80 is aligned with the small diameter outer circular portion of the NHOM disc 30, which is in the first locked position, particularly when the return assembly 80 is abutted against the large diameter outer circular portion 24 of the KISI disc 20 to be in the first locked position, as described below.

The KISI disc 20 has a large diameter outer circle part and a small diameter outer circle part which are concentric and different in diameter, the KISI disc 20 rotates to a position where the large diameter outer circle part of the KISI disc 20 is aligned with the abutting part of the return assembly 80 by means of the boss 41 on the counting gear mechanism 40 when the webbing pull-out length is smaller than a set value in the webbing pull-out process, and rotates to a position where the small diameter outer circle part 25 of the KISI disc 20 is aligned with the abutting part of the return assembly 80 by means of the boss 41 on the counting gear mechanism 40 when the webbing pull-out length reaches a second set value (the second set value is usually the webbing total length); the return assembly 80 is in a first, locked position when it is resting against the large diameter outer circular portion 24 of the KISI disc 20, and the return assembly 80 is in a second, locked position when it is resting against the small diameter outer circular portion 25 of the KISI disc 20. When the return assembly 80 is in the second locking position, the return assembly 80 is in a position to engage the ratchet teeth via the teeth of its release block, such that the retractor assembly switches from an ELR (EMERGENCY LOCKING RETRACTOR, emergency lock retractor) function to an ALR (Automatic Locking Retractor, auto lock retractor) function that applies to a condition in which the child seat is worn. The KISI disc 20 is provided with a special-shaped hole matched with the boss 41 of the counting gear mechanism 40, the KISI disc 20 is provided with a first edge which is in extrusion fit with the boss 41 in the webbing pulling process and a second edge 22 which is opposite to the first edge 21 and is in extrusion fit with the boss in the webbing recovery process, the first edge 21 and the second edge 22 are positioned at two ends of the special-shaped hole in the length direction, the size of the special-shaped hole of the KISI disc 20 in the length direction is larger than the size of the boss 41, so that the length of the special-shaped hole corresponds to the length of the recovered webbing required when the webbing is recovered from a second set value to the retractor assembly to be switched to leave the ALR function.

Specifically, under the working condition that the child seat wears the safety belt, when the webbing is continuously pulled out and reaches the second set value, the first edge of the KISI disc 20 is in contact with the boss 41, the KISI disc 20 is driven by the boss 41 to rotate to a position where the small-diameter round part of the KISI disc 20 is aligned with the abutting part of the return component 80, at this time, the return component 80 abuts against the small-diameter outer round part 25 of the KISI disc 20 under the resilience force of the spiral bottom tail end 87, and the tooth part 88 of the release block 85 engages with the ratchet teeth of the ratchet 101 of the webbing sensing component, so that the webbing can not be pulled out continuously; when the safety belt is worn, a section of recovery occurs, but at this time, because the size of the special-shaped hole of the KISI disk 20 in the length direction is larger than the size of the boss 41, the boss 41 of the KISI disk 20 and the counting gear mechanism 40 is matched with a larger gap 23 when the webbing is pulled out to be recovered, so that the boss 41 can not drive the KISI disk 20 to rotate reversely within a section of range, the release block 85 can not be separated from the ratchet to release the ratchet, the safety belt still can not be pulled out at this time, the safety risk caused by pulling the webbing in the riding process of children is effectively ensured, and the ALR function is realized. Until the webbing is recovered from the second set point to the recovered webbing length required when the retractor assembly is switched away from the ALR function, the boss 41 is rotated to a position in contact with the second rib 22, at which time the boss 41 drives KISI the disc 20 to rotate to a position in which the large diameter outer edge portion of the KISI disc 20 is aligned with the abutment portion of the return assembly 80, at which time the return assembly 80 abuts against the large diameter outer edge portion of the KISI disc 20 to swing down to the unlocked position, at which time the return assembly 80 releases the ratchet teeth of the ratchet wheel 101 through its release block 85, at which time the ALR function is switched away to return to the ELR function mentioned above.

In other embodiments, when the conversion device includes only KISI disk 20 and not NHOM disk 30, the KISI disk 20 further includes a second large diameter outer diameter portion identical to the center positions of the large diameter outer diameter portion 24 and the small diameter outer diameter portion 25 of the KISI disk 20, the KISI disk 20 being in a position where the second large diameter outer diameter portion of the KISI disk 20 aligns with an abutment portion of the return assembly 80 when the webbing pull-out length exceeds a set value and does not reach a second set value, the second large diameter outer diameter portion of the KISI disk 20 having a larger diameter than the large diameter outer diameter portion of the KISI disk 20, the return assembly 80 being in an unlocked position when it abuts against the second large diameter outer diameter portion of the NHOM disk 30. Therefore, after the counting gear mechanism is used for metering the pulling-out length of the webbing, the conversion device can limit whether the return assembly is in the first locking position according to the judging result of whether the pulling-out length of the webbing exceeds a set value.

When the second large diameter outer circular portion 24 of the KISI disc 20 or the large diameter outer circular portion 31 of the NHOM disc 30 is aligned with the abutting portion of the return assembly 80, the hold-down spring 60 releases the hold-down spring 84, and the electromagnet does not provide electromagnetic force, the return assembly 80 swings down to the unlock position, the hold-down spring 84 presses down the pawl 91 downward so that the pawl 91 rotates to engage with the ratchet, and the seat belt is locked.

As shown in fig. 6, the eccentric cam 50 includes a hollow cylindrical portion 51 having a shaft hole and an eccentric portion 52 fitted over the outer side of the hollow cylindrical portion. The hollow cylindrical part 51 is connected with the belt sensing assembly 100 through spline fit, so that the eccentric cam 50 is driven to rotate through rotation of the belt sensing assembly 100. That is, the eccentric cam 50 is provided to be locked when the pawl is opened, and to be rotated synchronously with the take-up drum 140 when the pawl contacts the electromagnet. The eccentric cam 50 is cooperatively connected with the counter gear mechanism 40 through an eccentric portion 52. The eccentric portion 52 is eccentric with respect to the rotation axis of the winding drum, and is used for driving the counting gear mechanism 40 to rotate, so as to perform the function of the counting gear mechanism 40.

Therefore, the eccentric cam 50 drives the counting gear mechanism 40 to rotate, the boss 41 on the counting gear mechanism 40 drives the NHOM disc 30 and the KISI disc 20 to rotate, and the outer walls of the disc 20 and the disc 30 and the KISI are limited by virtue of the NHOM disc 80 to face the return assembly 80, so that a motion feeling giving function is performed.

The operation of the electronic vehicular seat belt retractor assembly of the present invention will be described with reference to fig. 3A to 5B.

As shown in fig. 3A and 3B, when the occupant just pulls out the webbing (i.e., the webbing), but does not exceed the webbing length setting value, the small diameter outer circular portion of NHOM disc 30 is aligned with the position of the rod end of the abutment arm 83 of the return assembly 80, the large diameter outer circular portion 24 of KISI disc 20 is aligned with the position of the rod end of the abutment arm 83 of the return assembly 80, and therefore the return assembly 80 abuts against the outer wall surface of the large diameter outer circular portion 24 of KISI disc 20, KISI discs 20 and NHOM disc 30 cause the return assembly 80 to be released to rotate to the unlocking position (i.e., the position reached upon upward swing), and the downward pressure spring 70 does not contact the pawl 91 on the locking electromagnetic switch 90, so that the pawl 91 cannot lock the webbing assembly 100, and the electromagnetic switch 90 still has the feel locking function, at which time the webbing can be pulled out normally.

As shown in fig. 4A and fig. 4B, when the occupant continues to pull out the seat belt and the pulling-out amount of the webbing exceeds the set value and does not exceed the second set value, the eccentric cam 50 rotates synchronously with the take-up drum 140 and drives the counter gear mechanism 40 to eccentrically rotate, the counter gear mechanism 40 has a tooth number difference with the internal teeth of the mechanical housing 10, the boss 41 in the counter gear mechanism 40 performs a small-difference tooth decelerating motion during rotation, drives the NHOM disc 30 to reversely rotate relative to the take-up drum 140, the NHOM disc 30 rotates to a position where the large-diameter outer circular portion of the NHOM disc 30 aligns with the abutting portion of the return assembly 80, the restraining spring 60 still continues to have the same rotation tendency of the take-up drum 140 along with the eccentric cam 50, and the restraining spring 60 is at the locking angle by the limiting groove on the mechanical housing 10, the swingable portion of the restraining spring 60 hooks the pressing spring 84 when the restraining spring 60 is at the locking angle, so that the pressing spring 84 is limited, the pressing spring 70 still can not contact the pawl 91, and the pawl 91 still can not lock the webbing inductance assembly 100. The electromagnetic switch 90 still has no car feel locking function, and the webbing can be pulled out normally.

As shown in fig. 5A and 5B, when the occupant wears the webbing, a small recovery of the webbing occurs, and at this time, the depressing spring 84 is released by friction rotation of the suppressing spring 60, so that the pawl 91 is driven to open by the depressing of the depressing spring, the vehicle-feel function is normally performed, the electromagnetic switch 90 is given a vehicle-feel locking function, after this state, the electromagnetic switch is energized, the engaging pawl 91 does not trigger the vehicle-feel locking function, and the vehicle-feel locking function is triggered after the energization is stopped.

The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and various modifications can be made to the above-described embodiment of the present invention. All simple, equivalent changes and modifications made in accordance with the claims and the specification of the present application fall within the scope of the patent claims. The present invention is not described in detail in the conventional art.

Claims (10)

1. An electronic vehicular seat belt retractor assembly comprising:

A tape drum rotatably mounted in the frame, on which a webbing is wound;

a locking device configured to lock the webbing take-up drum in a pull-out direction of the webbing;

A tape feel assembly having ratchet teeth arranged to drive a locking means to lock the tape cartridge when the ratchet teeth are engaged;

An electromagnetic switch having a pawl; and

A return assembly having a hold down spring;

wherein the pawl is acted upon by a spring force or magnetic force in the opposite direction of engagement with the ratchet teeth;

the return assembly is arranged at an unlocking position when the pulling-out length of the webbing exceeds a set value;

The retractor assembly further comprises a suppression spring, wherein the suppression spring is arranged at a position limiting the pressing spring when the winding drum rotates along the drawing direction of the webbing, and is arranged at a position releasing the pressing spring when the winding drum rotates along the opposite direction of the drawing direction of the webbing;

When the return assembly is in the unlocking position and the restraining spring is in a position for releasing the pressing spring, the pressing spring is in pressing fit with the pawl, so that the pawl rotates to a position engaged with the ratchet, and otherwise, the pawl is in a position disengaged from the ratchet.

2. The electronic vehicle-feel seatbelt retractor assembly according to claim 1, wherein the restraining spring is swingable between a lock angle and an unlock angle, is in a position to limit the pressing down spring when the restraining spring is at the lock angle, and is in a position to release the pressing down spring when the restraining spring is at the unlock angle.

3. The electronic vehicular seat belt retractor assembly according to claim 2, wherein the swingable portion of the suppression spring is a hook structure, and the pressing spring is an elastically bent structure.

4. The electronic vehicle-feel seatbelt retractor assembly according to claim 2, wherein the metering of the webbing pull-out length is achieved in the form of a counter gear mechanism coupled to the take-up spool, the counter gear mechanism judging whether the webbing pull-out length exceeds a set value and controlling movement of a switching device according to a result of the judgment, releasing the return member to be located at a first locking position by the switching device when the webbing pull-out length is smaller than the set value, and limiting the return member to be at an unlocking position when the webbing pull-out length exceeds the set value; when the return assembly is in the first locking position, it is in a position in which the hold-down spring and the pawl are not pressed against each other and do not engage with the ratchet itself.

5. The electronic vehicle-feel seatbelt retractor assembly according to claim 4, wherein the counter gear mechanism includes an annular tooth portion driven by a rotation shaft of the take-up drum, the annular tooth portion being arranged eccentrically with respect to a corresponding tooth portion of an annular shape, and rolling circumferentially on the corresponding tooth portion during rotation of the rotation shaft of the take-up drum, thereby driving the corresponding tooth portion to perform a decelerating rotational motion.

6. The electronic car feel seatbelt retractor assembly according to claim 4, wherein a boss for driving the conversion device to move is provided on the counter gear mechanism;

The conversion device includes:

NHOM discs, wherein the NHOM discs are provided with large-diameter outer circle parts and small-diameter outer circle parts with the same circle center positions; the NHOM disc is positioned at the position of the small-diameter outer circular part of the NHOM disc, which is aligned with the abutting part of the return assembly, when the webbing pull-out length is smaller than a set value, and when the webbing pull-out length exceeds the set value and does not reach a second set value, the boss on the counting gear mechanism is rotated to the position of the large-diameter outer circular part of the NHOM disc, which is aligned with the abutting part of the return assembly; the return assembly is in an unlocking position when being abutted against the large-diameter outer circular part of NHOM; and/or

A disc KISI, wherein the disc KISI is provided with a large-diameter outer circle part and a small-diameter outer circle part which are concentric and different in diameter, the disc KISI rotates to a position where the large-diameter outer circle part of the disc KISI is aligned with the abutting part of the return assembly by means of a boss on the counting gear mechanism when the pulling length of the webbing is smaller than a set value in the pulling process of the webbing, and rotates to a position where the small-diameter outer circle part of the disc KISI is aligned with the abutting part of the return assembly by means of the boss on the counting gear mechanism when the pulling length of the webbing reaches a second set value; the return assembly is in a first locking position when the return assembly is abutted against the large-diameter outer circular part of the KISI disc;

When the conversion device only comprises KISI discs, the KISI discs further comprise second large-diameter outer circle parts which are the same as the circle centers of the large-diameter outer circle parts and the small-diameter outer circle parts of the KISI discs, the KISI discs are positioned at the positions where the second large-diameter outer circle parts of the KISI discs are aligned with the abutting parts of the return components when the pulling-out length of the braid exceeds a set value and does not reach a second set value, the diameters of the second large-diameter outer circle parts of the KISI discs are larger than those of the large-diameter outer circle parts of the KISI discs, and the return components are positioned at unlocking positions when the second large-diameter outer circle parts of the NHOM discs are abutted.

7. The electronic vehicle-feel seatbelt retractor assembly according to claim 6, wherein the conversion device comprises at least KISI discs and the return member is in a second locking position when it is resting on a small diameter outer circular portion of KISI discs; the return assembly has a release block that is in a position to engage the ratchet teeth by a tooth of its release block when the return assembly is in the second, locked position, so that the retractor assembly switches from ELR function to ALR function.

8. The electronic car feel seatbelt retractor assembly according to claim 7, wherein the KISI tray is provided with a special-shaped hole which is matched with the boss of the counting gear mechanism, the KISI tray is provided with a first edge which is in extrusion fit with the boss during webbing pulling-out process and a second edge which is opposite to the first edge and is in extrusion fit with the boss during webbing recovery process, the first edge and the second edge are positioned at two ends of the special-shaped hole in the length direction, and the size of the special-shaped hole in the length direction is larger than the size of the boss, so that the length of the special-shaped hole corresponds to the length of recovered webbing required when the webbing is recovered from a second set value to the retractor assembly to be switched to leave the ALR function.

9. The electronic vehicle-feel seatbelt retractor assembly according to claim 1, further comprising an eccentric cam coupled to a rotating shaft of the webbing assembly, one end of the restraining spring being friction interference fit on the eccentric cam.

10. The electronic vehicle feel seatbelt retractor assembly according to claim 1, wherein one end of the restraining spring is friction grip fitted over an outer wall of the feel assembly.