Safety belt winder, safety belt assembly and vehicle

Abstract

The utility model discloses a safety belt winder, a safety belt assembly and a vehicle. The seatbelt winder includes: a frame; a tape reel; the conductive coil is arranged on one side of the tape winding drum; the magnetic part is fixedly arranged on the periphery of the conductive coil; the transmission assembly is in transmission connection between the tape winding drum and the conductive coil, and the transmission assembly comprises a driving part connected with the tape winding drum, a driven part connected with the conductive coil and a transmission part in transmission connection between the driving part and the driven part; when the driving part rotates along with the tape winding drum, the transmission part transmits rotation of the driving part to rotation of the driven part, so that the rotating speed of the driven part is larger than that of the driving part, and the conductive coil moves in an accelerated mode. The conductive coil accelerates to cut magnetic induction lines in the magnetic part and generates induction current, and the magnetic field of the magnetic part generates reverse Lorentz force on the conductive coil at the same time so as to prevent the tape winding drum from rotating. Therefore, the problem that the force for preventing the belt winding drum from rotating is insufficient due to the fact that magnetic control resistance torque generated by an existing safety belt retractor is small is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile safety, in particular to a seat belt retractor, a seat belt assembly and a vehicle. Background Art

[0002] As the first line of defense in a collision, seatbelts are subject to increasingly stringent requirements for performance and flexibility. Conventional force-limited seatbelt retractors cannot adjust their force limits, often leading to the following issues: Because the force limits of seatbelts are designed for the tolerance of average-sized occupants (the majority of the average body type), when smaller occupants are involved in a collision while wearing seatbelts, the higher force limits can cause greater impact to their shoulders and chest ribs, leading to serious injuries.

[0003] To this end, a related art provides a magnetically controlled adaptive force-limiting seatbelt retractor. When the seatbelt is stretched, the reel rotates, and the reel directly drives the conductive ring to rotate synchronously. The conductive ring cuts the magnetic flux lines in the magnetic field of the magnet assembly to generate an induced current. The magnetic field of the magnet assembly also generates a reverse Lorentz force on the conductive ring to generate magnetically controlled resistance. When the reel rotates and the force-limiting rod rotates, a mechanical torque is also generated. The magnetically controlled resistance is superimposed on the mechanical torque to absorb collision energy, prevent the seatbelt from being pulled out, and overcome inertia to protect the occupants from rushing forward. In the above scheme, the magnetically controlled resistance torque generated by the conductive ring is small, resulting in insufficient force acting on the reel to prevent it from rotating. This makes it impossible to prevent the seatbelt from being pulled out in time, making it difficult to effectively protect the occupants in the event of a collision. Utility Model Content

[0004] In view of this, the present invention provides a seat belt retractor to solve the problem that the magnetic resistance torque generated by the current seat belt retractor is small, resulting in insufficient force to prevent the belt reel from rotating, and unable to prevent the seat belt from being pulled out in time, making it difficult to provide effective protection for the occupants.

[0005] At the same time, the utility model provides a seat belt assembly to solve the problem that the magnetic resistance torque generated by the current seat belt retractor is small, resulting in insufficient force to prevent the belt reel from rotating, and unable to prevent the seat belt from being pulled out in time, making it difficult to effectively protect the occupants.

[0006] Furthermore, the present invention provides a vehicle to solve the problem that the magnetically controlled resistance torque generated by the current seat belt retractor is small, resulting in insufficient force to prevent the belt reel from rotating, and unable to prevent the seat belt from being pulled out in time, making it difficult to effectively protect the occupants.

[0007] In a first aspect, the utility model provides a seat belt retractor, comprising: a frame, with a accommodating chamber provided therein; a belt reel for being driven by the seat belt to rotate, the belt reel being provided in the accommodating chamber; a conductive coil provided on one side of the belt reel; a magnetic member fixedly provided on the periphery of the conductive coil; a transmission assembly, which is transmission-connected between the belt reel and the conductive coil, the transmission assembly comprising an active member connected to the belt reel, a driven member connected to the conductive coil, and a transmission member transmission-connected between the active member and the driven member; wherein, when the active member rotates with the belt reel, the transmission member transmits the rotation of the active member to the rotation of the driven member, so that the rotation speed of the driven member is greater than the rotation speed of the active member, so as to accelerate the movement of the conductive coil; the conductive coil accelerates the cutting of the magnetic lines of force in the magnetic member and generates an induced current, and the magnetic field of the magnetic member simultaneously generates a reverse Lorentz force on the conductive coil to hinder the rotation of the belt reel.

[0008] Beneficial effect: The utility model provides a seat belt retractor, which connects a transmission component between a belt drum and a conductive coil, utilizes the intermediate transmission effect of the transmission part to accelerate the rotation speed input by the active part to be output by the driven part, and converts the low-speed rotation of the belt drum into the high-speed rotation of the conductive coil, so that the conductive coil is accelerated to cut the magnetic flux lines in the magnetic part and generate an induced current; since the greater the speed of the charged particles in the magnetic field cutting the magnetic flux lines, the greater the Lorentz force, and the speed of the charged particles in the magnetic field cutting the magnetic flux lines is reflected in the conductive coil, which is the linear velocity of the conductive coil relative to the magnetic part when rotating; thereby, the accelerated conductive coil generates a greater reverse Lorentz force, namely, magnetic control resistance, under the action of the magnetic field of the magnetic part, so that the force hindering the rotation of the belt drum is increased, so as to quickly prevent the seat belt from being pulled out, thereby solving the problem that the magnetic control resistance torque generated by the current seat belt retractor is small, resulting in insufficient force to prevent the belt drum from rotating, and failure to prevent the seat belt from being pulled out in time, resulting in difficulty in effectively protecting the occupant.

[0009] In an optional embodiment, the transmission assembly is configured as a planetary gear train, which includes: a planetary gear set, including a planetary carrier and a first planetary gear arranged on the planetary carrier; a first ring gear, internally meshing with the first planetary gear; and a first sun gear, externally meshing with the first planetary gear; wherein the planetary gear set is configured as the active member, the first ring gear is configured as the driven member, and the first sun gear is configured as the transmission member.

[0010] In an optional embodiment, the rotating shaft of the belt reel is fixedly connected to the center of the planetary carrier; and the conductive coil is fixedly connected to the outer peripheral side of the first ring gear.

[0011] Beneficial Effects: The belt reel's rotating shaft is fixedly connected to the planetary carrier of the planetary gear set, serving as the active component, causing the planetary gear set to rotate with the belt reel. The conductive coil is fixedly connected to the circumference of the first ring gear, serving as the driven component, causing the conductive coil to rotate with the first ring gear. The first sun gear, serving as the transmission component, is not connected to anything else, and its position is fixed after assembly. This arrangement of the planetary gear train allows for a natural arrangement based on the location of the belt reel and conductive coil, eliminating the need for excessive connection and fixing structures, thus helping to reduce the overall weight of the seatbelt retractor.

[0012] In an optional embodiment, the transmission assembly is configured as a planetary gear train, which includes: a planetary gear set, including a planetary carrier and a first planetary gear arranged on the planetary carrier; a first ring gear, internally meshing with the first planetary gear; and a first sun gear, externally meshing with the first planetary gear; wherein the planetary gear set is configured as the active member, the first sun gear is configured as the driven member, and the first ring gear is configured as the transmission member.

[0013] In an optional embodiment, the rotating shaft of the belt reel is fixedly connected to the center of the planetary carrier; a first extension rod is arranged in the axial direction of the first sun gear, the extension rod is connected to a first annular member parallel to the first sun gear, and the conductive coil is fixedly connected to the outer peripheral side of the first annular member.

[0014] Beneficial Effects: The rotating shaft of the belt reel is fixedly connected to the planetary carrier of the planetary gear set, which serves as the active component, so that the planetary gear set rotates with the rotation of the belt reel. A first extension rod is provided axially of the first sun gear, which serves as the driven component, and a first annular member parallel to the first sun gear is connected to the first extension rod. The conductive coil is fixedly connected to the first annular member in the circumferential direction, so that the conductive coil rotates with the rotation of the first sun gear. The first ring gear, which serves as the transmission component, is not connected to anything else and its movement position is fixed after assembly. The first extension rod and the first annular member are provided to prevent the movement of the conductive coil from interfering with the movement of the first sun gear.

[0015] In an optional embodiment, the transmission assembly is configured as a planetary gear train, which includes: a planetary gear set, including a planetary carrier and a first planetary gear arranged on the planetary carrier; a first ring gear, internally meshing with the first planetary gear; and a first sun gear, externally meshing with the first planetary gear; wherein the first ring gear is configured as the active member, the first sun gear is configured as the driven member, and the planetary gear set is configured as the transmission member.

[0016] In an optional embodiment, a first connecting structure is provided on a side of the first ring gear close to the belt drum, and the belt drum is fixedly connected to the first connecting structure; a second extension rod is provided in the axial direction of the first sun gear, and the second extension rod is connected to a second annular member parallel to the first sun gear, and the conductive coil is fixedly connected to the outer peripheral side of the second annular member.

[0017] Beneficial effects: A first connecting structure is provided on the side of the first ring gear as the active component close to the belt drum, and the first connecting structure is fixedly connected to the belt drum so that the first ring gear rotates with the rotation of the belt drum; a second extension rod is provided in the axial direction of the first sun gear as the driven component, and a second annular component parallel to the first sun gear is connected to the second extension rod, and the conductive coil is fixedly connected to the circumferential direction of the second annular component so that the conductive coil rotates with the rotation of the first sun gear; the planetary gear set as the transmission component is not connected in any way, and the movement position is fixed after assembly. The first connecting structure is provided to prevent the movement of the belt drum from interfering with the movement of the first ring gear. The second extension rod and the second annular component are provided to prevent the movement of the conductive coil from interfering with the movement of the first sun gear.

[0018] In an optional embodiment, the transmission assembly is configured as a differential gear train, which includes: a tie rod; a second sun gear, rotatably connected to one end of the tie rod; a second planetary gear, rotatably connected to the other end of the tie rod, the second planetary gear externally meshing with the second sun gear; a second ring gear, internally meshing with the second planetary gear; wherein the second ring gear is configured as the active member, the second sun gear is configured as the driven member, and the tie rod and the second planetary gear are configured as the transmission members.

[0019] In an optional embodiment, a second connecting structure is provided on the side of the second ring gear close to the belt drum, and the belt drum is fixedly connected to the second connecting structure; a third extension rod is provided in the axial direction of the second sun gear, and the third extension rod is connected to a third annular member parallel to the second sun gear, and the conductive coil is fixedly connected to the outer peripheral side of the third annular member.

[0020] Beneficial Effects: A second connecting structure is provided on the side of the second ring gear, serving as the active component, near the belt reel. The second connecting structure is fixedly connected to the belt reel, causing the second ring gear to rotate with the rotation of the belt reel. A third extension rod is provided axially of the second sun gear, serving as the driven component. A third annular member parallel to the second sun gear is connected to the third extension rod. The conductive coil is fixedly connected circumferentially to the third annular member, causing the conductive coil to rotate with the rotation of the second sun gear. The second connecting structure is provided to prevent interference between the movement of the belt reel and the movement of the second ring gear. The third extension rod and the third annular member are provided to prevent interference between the movement of the conductive coil and the movement of the second sun gear.

[0021] In an optional embodiment, the seat belt retractor further includes an end cover arranged on one side of the frame, wherein a receiving cavity is formed in the end cover, and the conductive coil, the magnetic component and the transmission assembly are arranged in the receiving cavity.

[0022] Beneficial effects: The end cover provides an installation location for the conductive coil, magnetic parts and transmission components.

[0023] In a second aspect, the present invention further provides a seat belt assembly, comprising the seat belt retractor according to any one of the above embodiments and a seat belt, wherein the seat belt is wound around the belt reel.

[0024] Because the seat belt assembly includes a seat belt retractor and has the same effect as the seat belt retractor, it will not be described in detail here.

[0025] In a third aspect, the present invention further provides a vehicle, comprising a seat, and a seat belt assembly according to any one of the above embodiments, wherein the seat belt assembly is provided at the seat of the vehicle.

[0026] Because the vehicle includes a seat belt assembly, it has the same effect as the seat belt assembly and is not described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a structural diagram of a seat belt retractor provided by the utility model;

[0029] Figure 2 An exploded view of a first embodiment of a seat belt retractor provided by the present invention in which the transmission assembly is configured as a planetary gear train;

[0030] Figure 3 This is a structural schematic diagram of a first embodiment of the transmission assembly provided by the present invention when it is configured as a planetary gear train;

[0031] Figure 4 This is a structural schematic diagram of a second embodiment of the present invention when the transmission assembly is configured as a planetary gear train;

[0032] Figure 5 This is a structural schematic diagram of a third embodiment of the present invention when the transmission assembly is configured as a planetary gear train;

[0033] Figure 6 This is a structural schematic diagram of the transmission assembly provided by the utility model when it is configured as a differential gear system.

[0034] Description of reference numerals:

[0035] 1. Tape reel;

[0036] 2. Force limiting rod;

[0037] 3. Conductive coil;

[0038] 4. Magnetic parts;

[0039] 501, active part; 502, driven part; 503, transmission part;

[0040] 6. Planetary gear train; 601. Planetary gear set; 6011. Planet carrier; 6012. First planetary gear; 602. First ring gear; 603. First sun gear;

[0041] 7. Differential gear train; 701. Tie rod; 702. Second sun gear; 703. Second planetary gear; 704. Second ring gear;

[0042] 8. Framework;

[0043] 9. End cap;

[0044] 10. Locking mechanism. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0046] The following combination Figures 1-6 , describing the embodiments of the present utility model.

[0047] According to an embodiment of the present invention, on the one hand, a seat belt retractor is provided, such as Figure 1 、 Figure 2 As shown, it includes: a belt drum 1, a force limiting rod 2, a conductive coil 3, a magnetic part 4 and a transmission assembly.

[0048] A accommodating cavity is provided inside the frame 8; a belt reel 1 is used to be driven by the safety belt to rotate, and the belt reel 1 is provided in the accommodating cavity; a conductive coil 3 is provided on one side of the belt reel 1; a magnetic member 4 is fixedly provided on the periphery of the conductive coil 3; a transmission assembly is transmission-connected between the belt reel 1 and the conductive coil 3, and the transmission assembly includes an active member 501 connected to the belt reel 1, a driven member 502 connected to the conductive coil 3, and a transmission member 503 transmission-connected between the active member 501 and the driven member 502; wherein, when the active member 501 rotates with the belt reel 1, the transmission member 503 transmits the rotation of the active member 501 to the rotation of the driven member 502, so that the rotation speed of the driven member 502 is greater than the rotation speed of the active member 501, so that the conductive coil 3 accelerates the movement; the conductive coil 3 accelerates the cutting of the magnetic flux lines in the magnetic member 4 and generates an induced current, and the magnetic field of the magnetic member 4 simultaneously generates a reverse Lorentz force on the conductive coil 3 to hinder the rotation of the belt reel 1.

[0049] Specifically, if Figure 1 、 Figure 2 As shown, when the belt reel 1 is driven by the seatbelt to rotate, the driving member 501 connected to the belt reel 1 in the transmission assembly is affected by the rotation of the belt reel 1. Through the intermediate transmission of the transmission member 503, the speed of the driven member 502 is greater than the speed of the driving member 501, thereby accelerating the driven member 502 connected to the conductive coil 3, accelerating the conductive coil 3, and accelerating the conductive coil 3 to cut through the magnetic flux lines in the magnetic member 4, generating an induced current. According to the Lorentz force (also known as magnetron drag), F = Q × V × B, where Q represents the charge of the charged particle; V represents the speed at which the charged particle cuts through the magnetic flux lines in the magnetic field; and B represents the magnetic flux density. It can be seen from this that when the charge amount and magnetic induction intensity of the charged particles remain unchanged, the greater the speed at which the charged particles in the magnetic field cut the magnetic lines of flux, the greater the Lorentz force; and the speed at which the charged particles in the magnetic field cut the magnetic lines of flux is reflected in the conductive coil 3, that is, the linear velocity of the conductive coil 3 relative to the magnetic part 4 when it rotates; therefore, the faster the speed of the conductive coil 3, the greater the reverse Lorentz force generated by the magnetic field of the magnetic part 4 on the conductive coil 3 in the opposite direction to the Lorentz force, that is, the greater the force that hinders the rotation of the tape reel 1.

[0050] It should be noted that in a system of high-speed charged particles, the behavior of the magnetic and electric fields can change due to relativistic effects. According to relativistic electrodynamics, when the speed of the charged particles is sufficiently great, the electric and magnetic fields transform into each other. In this case, the expression for the Lorentz force can also be modified. For example, in some accelerating charged particle beams, the direction of the Lorentz force observed from a stationary reference frame may be reversed due to relativistic transformations, thereby generating a reverse Lorentz force. This embodiment provides a seatbelt retractor that conveniently utilizes this characteristic, using the reverse Lorentz force to achieve electromagnetic braking, that is, using the reverse Lorentz force to quickly stop the rotating belt reel 1.

[0051] Further, if Figure 1 、 Figure 2 As shown, the specific structural form of the transmission assembly is not limited in this embodiment, as long as it can achieve the effect of accelerating the speed input by the driving member 501 and outputting it at the driven member 502. In fact, both structural forms of the epicyclic gear train can achieve the effect of accelerating the speed input by the driving member 501 and outputting it at the driven member 502. Therefore, in one embodiment, the transmission assembly is configured as a planetary gear train; in another embodiment, the transmission assembly is configured as a differential gear train.

[0052] This embodiment provides a seatbelt retractor. A transmission assembly is connected between a belt reel 1 and a conductive coil 3. The transmission element 503 accelerates the rotational speed input by the driving element 501 to the output of the driven element 502 via the intermediate transmission function of the transmission element 503, thereby converting the low-speed rotation of the belt reel 1 into high-speed rotation of the conductive coil 3. This accelerates the conductive coil 3 to cut through the magnetic flux lines in the magnetic element 4, generating an induced current. Because the greater the speed at which charged particles in a magnetic field cut through the magnetic flux lines, the greater the Lorentz force. The speed at which charged particles in a magnetic field cut through the magnetic flux lines is reflected in the conductive coil 3 as the linear velocity of the conductive coil 3 relative to the magnetic element 4 during rotation. Consequently, the accelerated conductive coil 3 generates a greater opposing Lorentz force, or magnetically controlled resistance, under the influence of the magnetic field of the magnetic element 4. This increases the force resisting the rotation of the belt reel 1, thereby quickly preventing the belt from being withdrawn. This solves the problem in existing seatbelt retractors where the magnetically controlled resistance torque is low, resulting in insufficient force to prevent the belt from being withdrawn, and thus making it difficult to effectively protect the occupant.

[0053] In some embodiments, as Figure 2-Figure 5 As shown, the transmission assembly is configured as a planetary gear train 6 , which includes a planetary gear set 601 , a first ring gear 602 and a first sun gear 603 .

[0054] The planetary gear set 601 includes a planet carrier 6011 and a first planetary gear 6012 disposed on the planet carrier 6011 ; the first ring gear 602 is internally meshed with the first planetary gear 6012 ; and the first sun gear 603 is externally meshed with the first planetary gear 6012 .

[0055] Specifically, if Figure 2-Figure 5As shown, a planetary gear train 6 is used as a transmission assembly, with one of the planetary gear set 601, the first ring gear 602, and the first sun gear 603 being configured as the active member 501, another being configured as the driven member 502, and yet another being configured as the transmission member 503. The transmission member 503 is fixed in position during movement of the active member 501 and the driven member 502. This configuration allows for six transmission modes to be obtained. An acceleration transmission mode is selected in which the rotational speed of the driven member 502 in three of the groups is greater than the rotational speed of the active member 501, and the transmission ratio between the active member 501 and the driven member 502 is less than 1. This allows the rotational speed input by the active member 501 to be accelerated and output by the driven member 502, thereby ensuring that the conductive coil 3 undergoes accelerated motion and generates a greater reverse Lorentz force, or magnetron resistance, under the action of the magnetic field of the magnetic member 4.

[0056] The following will describe three transmission modes using the planetary gear train 6 as a transmission component one by one.

[0057] In some embodiments, as Figure 2 、 Figure 3 As shown, as the first embodiment when the transmission component is set as a planetary gear system, which is also the preferred embodiment, the planetary gear set 601 is set as the active member 501, the first ring gear 602 is set as the driven member 502 and the first sun gear 603 is set as the transmission member 503.

[0058] Specifically, if Figure 2 、 Figure 3 As shown, this arrangement enables the rotation of the tape reel 1 to drive the planet carrier 6011 of the planetary gear set 601, which in turn drives the first ring gear 602 and the first sun gear 603 to rotate, respectively, through the first planetary gear 6012 of the planetary gear set 601. This ultimately accelerates the rotation of the first ring gear 602, thereby accelerating the rotation of the conductive coil 3. With this arrangement, the transmission ratio between the planetary gear set 601 and the first ring gear 602 is 0.6-0.8.

[0059] In some embodiments, as Figure 2 、 Figure 3 As shown, the rotating shaft of the tape reel 1 is fixedly connected to the center of the planetary carrier 6011 ; the conductive coil 3 is fixedly connected to the outer peripheral side of the first gear ring 602 .

[0060] Specifically, if Figure 2 、 Figure 3As shown, the rotating shaft of the belt reel 1 is fixedly connected to the planet carrier 6011 of the planetary gear set 601, which serves as the driving element 501. This allows the planetary gear set 601 to rotate with the rotation of the belt reel 1. The conductive coil 3 is fixedly connected to the circumference of the first ring gear 602, which serves as the driven element 502. This allows the conductive coil 3 to rotate with the rotation of the first ring gear 602. The first sun gear 603, which serves as the transmission element 503, is not connected to anything else and its position is fixed after assembly. This arrangement of the planetary gear train 6 allows for a natural arrangement based on the location of the belt reel 1 and the conductive coil 3, eliminating the need for excessive connection and fixing structures, thus helping to reduce the overall weight of the seatbelt retractor.

[0061] In some embodiments, as Figure 2 、 Figure 4 As shown, as a second embodiment when the transmission component is configured as a planetary gear train, the planetary gear set 601 is configured as the active member 501 , the first sun gear 603 is configured as the driven member 502 , and the first ring gear 602 is configured as the transmission member 503 .

[0062] Specifically, if Figure 2 、 Figure 4 As shown, this arrangement enables the rotation of the tape reel 1 to drive the planet carrier 6011 of the planetary gear set 601, which in turn drives the first sun gear 603 and the first ring gear 602 to rotate respectively via the first planetary gear 6012 of the planetary gear set 601, ultimately accelerating the rotation of the first sun gear 603 and, consequently, the conductive coil 3. With this arrangement, the transmission ratio between the planetary gear set 601 and the first sun gear 603 is 0.2-0.4.

[0063] In some embodiments, as Figure 2 、 Figure 4 As shown, the rotating shaft of the belt reel 1 is fixedly connected to the center of the planetary carrier 6011; a first extension rod is arranged in the axial direction of the first sun gear 603, and the extension rod is connected to a first annular member parallel to the first sun gear 603, and the conductive coil 3 is fixedly connected to the outer peripheral side of the first annular member.

[0064] Specifically, if Figure 2 、 Figure 4As shown, the rotating shaft of the belt reel 1 is fixedly connected to the planet carrier 6011 of the planetary gear set 601, which serves as the driving element 501, so that the planetary gear set 601 rotates with the rotation of the belt reel 1. A first extension rod is provided axially of the first sun gear 603, which serves as the driven element 502. A first annular member parallel to the first sun gear 603 is connected to the first extension rod. The conductive coil 3 is fixedly connected to the first annular member circumferentially, so that the conductive coil 3 rotates with the rotation of the first sun gear 603. The first ring gear 602, which serves as the transmission element 503, is not connected to anything else and its movement position is fixed after assembly. The first extension rod and the first annular member are provided to prevent the movement of the conductive coil 3 from interfering with the movement of the first sun gear 603.

[0065] In some embodiments, as Figure 2 、 Figure 5 As shown, as a third embodiment when the transmission assembly is configured as a planetary gear train, the first ring gear 602 is configured as the active member 501 , the first sun gear 603 is configured as the driven member 502 , and the planetary gear set 601 is configured as the transmission member 503 .

[0066] Specifically, if Figure 2 、 Figure 5 As shown, this arrangement enables the rotation of the tape reel 1 to drive the rotation of the first ring gear 602, which in turn drives the rotation of the first sun gear 603 via the first planetary gear 6012 of the planetary gear set 601, ultimately accelerating the rotation of the first sun gear 603 and, consequently, the rotation of the conductive coil 3. With this arrangement, the transmission ratio between the first ring gear 602 and the first sun gear 603 is 0.25-0.67.

[0067] In some embodiments, as Figure 2 、 Figure 5 As shown, a first connecting structure is provided on the side of the first gear ring 602 close to the belt drum 1, and the belt drum 1 is fixedly connected to the first connecting structure; a second extension rod is provided in the axial direction of the first sun gear 603, and the second extension rod is connected to a second annular member parallel to the first sun gear 603, and the conductive coil 3 is fixedly connected to the outer peripheral side of the second annular member.

[0068] Specifically, if Figure 2 、 Figure 5As shown, a first connecting structure is provided on the side of the first ring gear 602, serving as the active member 501, near the belt reel 1. The first connecting structure is fixedly connected to the belt reel 1, causing the first ring gear 602 to rotate with the rotation of the belt reel 1. A second extension rod is provided axially of the first sun gear 603, serving as the driven member 502. A second annular member parallel to the first sun gear 603 is connected to the second extension rod. The conductive coil 3 is fixedly connected circumferentially to the second annular member, causing the conductive coil 3 to rotate with the rotation of the first sun gear 603. The planetary gear set 601, serving as the transmission member 503, is not connected in any way and its movement position is fixed after assembly. The first connecting structure is provided to prevent interference between the movement of the belt reel 1 and the movement of the first ring gear 602. The second extension rod and the second annular member are provided to prevent interference between the movement of the conductive coil 3 and the movement of the first sun gear 603.

[0069] In some embodiments, as Figure 2 、 Figure 6 As shown, the transmission assembly is configured as a differential gear train 7 , which includes a tie rod 701 , a second sun gear 702 , a second planetary gear 703 and a second ring gear 704 .

[0070] The second sun gear 702 is rotationally connected to one end of the tie rod 701; the second planetary gear 703 is rotationally connected to the other end of the tie rod 701, and the second planetary gear 703 is externally meshed with the second sun gear 702; the second ring gear 704 is internally meshed with the second planetary gear 703; wherein, the second ring gear 704 is configured as the active member 501, the second sun gear 702 is configured as the driven member 502, and the tie rod 701 and the second planetary gear 703 are configured as the transmission member 503.

[0071] Specifically, if Figure 2 、 Figure 6 As shown, the differential gear train 7 is used as a transmission component, the second ring gear 704 is set as the active member 501, the second sun gear 702 is set as the driven member 502, and the tie rod 701 and the second planetary gear 703 are set as the transmission member 503. This configuration allows the belt reel 1 to rotate and drive the second ring gear 704 to rotate. The second sun gear 702 is driven by the joint action of the second planetary gear 703 and the tie rod 701, and finally the second sun gear 702 is accelerated to rotate, so that the conductive coil 3 is accelerated, thereby forming an acceleration transmission mode in which the speed of the driven member 502 is greater than the speed of the active member 501 and the transmission ratio between the active member 501 and the driven member 502 is less than 1, so that the speed input by the active member 501 is accelerated and output by the driven member 502, ensuring that the conductive coil 3 is accelerated and generates a larger reverse Lorentz force, i.e., magnetoresistive resistance, under the action of the magnetic field of the magnetic member 4.

[0072] In some embodiments, as Figure 2 、 Figure 6As shown, a second connecting structure is provided on the side of the second ring gear 704 close to the belt drum 1, and the belt drum 1 is fixedly connected to the second connecting structure; a third extension rod is provided in the axial direction of the second sun gear 702, and the third extension rod is connected to a third annular member parallel to the second sun gear 702, and the conductive coil 3 is fixedly connected to the outer peripheral side of the third annular member.

[0073] Specifically, if Figure 2 、 Figure 6 As shown, a second connecting structure is provided on the side of the second ring gear 704, serving as the active element 501, near the belt reel 1. The second connecting structure is fixedly connected to the belt reel 1, causing the second ring gear 704 to rotate with the rotation of the belt reel 1. A third extension rod is provided axially of the second sun gear 702, serving as the driven element 502. A third annular member parallel to the second sun gear 702 is connected to the third extension rod. The conductive coil 3 is fixedly connected circumferentially to the third annular member, causing the conductive coil 3 to rotate with the rotation of the second sun gear 702. The second connecting structure is provided to prevent interference between the movement of the belt reel 1 and the movement of the second ring gear 704. The third extension rod and the third annular member are provided to prevent interference between the movement of the conductive coil 3 and the movement of the second sun gear 702.

[0074] In some embodiments, as Figure 1 、 Figure 2 As shown, the seat belt retractor further includes an end cover 9 arranged on one side of the frame 8. An accommodating cavity is formed in the end cover 9, and the conductive coil 3, the magnetic component 4 and the transmission assembly are arranged in the accommodating cavity.

[0075] Specifically, if Figure 1 、 Figure 2 As shown, the end cover 9 provides a mounting location for the conductive coil 3, the magnetic member 4 and the transmission assembly.

[0076] Further, if Figure 1 、 Figure 2 As shown, the end cover 9 and the frame 8 are detachably connected, such as plug-in connection, thread connection, clamping connection, etc., so as to facilitate the inspection and maintenance of the internal structure.

[0077] Further, if Figure 1 、 Figure 2 As shown, a locking mechanism 10 is also provided on the other side of the frame 8 relative to the end cap 9. When the seat belt is pulled quickly using the quick-pull locking principle, the centrifugal clutch in the locking mechanism 10 immediately generates a huge centrifugal force, pulling out the clutch lever, pushing the cam to drive the sliding pin, thereby locking the ratchet on the spool and locking the seat belt. This locking method can prevent the seat belt from being ejected in the event of a collision, but if the person moves forward suddenly and quickly, the seat belt will be locked.

[0078] In some embodiments, as Figure 1 、 Figure 2As shown, the magnetic member 4 is configured as an annular magnet and is fixedly disposed on the side wall of the end cover 9 .

[0079] Specifically, if Figure 1 、 Figure 2 As shown, the magnetic member 4 is configured as a ring magnet so as to be disposed on the outer circumference of the conductive coil 3 .

[0080] Further, if Figure 2 As shown, the magnetic member 4 is configured as two arc-shaped magnets.

[0081] Furthermore, the magnetic member 4 is configured as a permanent magnet with a relatively strong magnetic force. In some embodiments, the magnetic member 4 can also be configured as an electromagnet.

[0082] In some embodiments, as Figure 1 、 Figure 2 As shown, the seat belt retractor further includes a force limiting rod 2 disposed in the frame 8 and connected to the belt reel 1 . The force limiting rod 2 is configured to be triggered by the rotation of the belt reel 1 during a collision to generate a mechanical torque to hinder the rotation of the belt reel 1 .

[0083] Specifically, if Figure 1 、 Figure 2 As shown, the force limiting rod 2 protects the passengers by limiting the tightness of the seat belt. The force limiting rod is usually composed of a spring, an adjustment device and a locking device. When the vehicle is driving normally, the spring will maintain a relatively balanced state, the force limiting rod is in a relaxed state, and the seat belt can be freely adjusted according to the needs of the passengers; when the vehicle collides or brakes suddenly, the passenger's body will move forward, and the inertia of the vehicle will cause the belt reel 1 to rotate, triggering the force limiting rod 2 to generate a mechanical torque to hinder the rotation of the belt reel 1. Specifically, the force limiting rod 2 is suddenly tightened, thereby limiting the tightness of the seat belt and overcoming inertia to protect the occupant from rushing forward. When the vehicle collides or brakes suddenly, the mechanical torque generated by the force limiting rod 2 is superimposed on the magnetic control resistance generated by the transmission assembly, the conductive coil 3 and the magnetic part 4, and together absorb the collision energy, slowing down the movement speed of the passengers, thereby protecting their bodies from injury.

[0084] According to an embodiment of the present invention, on the other hand, a seat belt assembly is provided, comprising the seat belt retractor according to any one of the above embodiments and a seat belt, wherein the seat belt is wound around a belt reel 1 .

[0085] Because the seat belt assembly includes a seat belt retractor and has the same effect as the seat belt retractor, it will not be described in detail here.

[0086] According to an embodiment of the present invention, in another aspect, a vehicle is provided, comprising a seat and a seat belt assembly according to any one of the above embodiments, wherein the seat belt assembly is provided at the seat of the vehicle.

[0087] Because the vehicle includes a seat belt assembly, it has the same effect as the seat belt assembly and is not described in detail here.

[0088] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by this solution.

Claims

1. A seat belt retractor, characterized in that: include: A frame (8) having an accommodating cavity therein; A belt reel (1) is used to be driven by the safety belt to rotate, and the belt reel (1) is arranged in the accommodating cavity; A conductive coil (3) is arranged on one side of the tape reel (1); A magnetic member (4) is fixedly arranged on the periphery of the conductive coil (3); a transmission assembly, which is transmission-connected between the tape reel (1) and the conductive coil (3), and comprises an active member (501) connected to the tape reel (1), a driven member (502) connected to the conductive coil (3), and a transmission member (503) transmission-connected between the active member (501) and the driven member (502); When the active member (501) rotates with the tape reel (1), the transmission member (503) transmits the rotation of the active member (501) to the rotation of the driven member (502), so that the rotation speed of the driven member (502) is greater than the rotation speed of the active member (501), so that the conductive coil (3) is accelerated; the conductive coil (3) accelerates the cutting of the magnetic flux lines in the magnetic member (4) and generates an induced current, and the magnetic field of the magnetic member (4) simultaneously generates a reverse Lorentz force on the conductive coil (3) to hinder the rotation of the tape reel (1).

2. The seat belt retractor according to claim 1, characterized in that: The transmission assembly is configured as a planetary gear train (6), and the planetary gear train (6) comprises: A planetary gear set (601) includes a planetary carrier (6011) and a first planetary gear (6012) arranged on the planetary carrier (6011); a first ring gear (602) meshing with the first planetary gear (6012); a first sun gear (603) externally meshing with the first planet gears (6012); The planetary gear set (601) is configured as the active member (501), the first ring gear (602) is configured as the driven member (502), and the first sun gear (603) is configured as the transmission member (503).

3. The seat belt retractor according to claim 2, characterized in that: The rotating shaft of the belt reel (1) is fixedly connected to the center of the planetary frame (6011); and the conductive coil (3) is fixedly connected to the outer peripheral side of the first gear ring (602).

4. The seat belt retractor according to claim 1, characterized in that: The transmission assembly is configured as a planetary gear train (6), and the planetary gear train (6) comprises: A planetary gear set (601) includes a planetary carrier (6011) and a first planetary gear (6012) arranged on the planetary carrier (6011); a first ring gear (602) meshing with the first planetary gear (6012); a first sun gear (603) externally meshing with the first planet gears (6012); The planetary gear set (601) is configured as the active member (501), the first sun gear (603) is configured as the driven member (502), and the first ring gear (602) is configured as the transmission member (503).

5. The seat belt retractor according to claim 4, characterized in that: The rotating shaft of the belt reel (1) is fixedly connected to the center of the planetary frame (6011); a first extension rod is provided in the axial direction of the first sun gear (603), and the extension rod is connected to a first annular member parallel to the first sun gear (603); the conductive coil (3) is fixedly connected to the outer peripheral side of the first annular member.

6. The seat belt retractor according to claim 1, characterized in that: The transmission assembly is configured as a planetary gear train (6), and the planetary gear train (6) comprises: A planetary gear set (601) includes a planetary carrier (6011) and a first planetary gear (6012) arranged on the planetary carrier (6011); a first ring gear (602) meshing with the first planetary gear (6012); a first sun gear (603) externally meshing with the first planet gears (6012); The first ring gear (602) is configured as the active member (501), the first sun gear (603) is configured as the driven member (502), and the planetary gear set (601) is configured as the transmission member (503).

7. The seat belt retractor according to claim 6, characterized in that: A first connecting structure is provided on a side of the first gear ring (602) close to the belt reel (1), and the belt reel (1) is fixedly connected to the first connecting structure; a second extension rod is provided in the axial direction of the first sun gear (603), and the second extension rod is connected to a second annular member parallel to the first sun gear (603), and the conductive coil (3) is fixedly connected to the outer peripheral side of the second annular member.

8. The seat belt retractor according to claim 1, characterized in that: The transmission assembly is configured as a differential gear train (7), and the differential gear train (7) comprises: Tie rod (701); a second sun gear (702) rotatably connected to one end of the tie rod (701); a second planetary gear (703) rotatably connected to the other end of the tie rod (701), the second planetary gear (703) externally meshing with the second sun gear (702); a second ring gear (704) meshing with the second planetary gear (703); The second ring gear (704) is configured as the active member (501), the second sun gear (702) is configured as the driven member (502), and the tie rod (701) and the second planetary gear (703) are configured as the transmission member (503).

9. The seat belt retractor according to claim 8, characterized in that: A second connecting structure is provided on a side of the second gear ring (704) close to the belt reel (1), and the belt reel (1) is fixedly connected to the second connecting structure; a third extension rod is provided in the axial direction of the second sun gear (702), and the third extension rod is connected to a third annular member parallel to the second sun gear (702), and the conductive coil (3) is fixedly connected to the outer peripheral side of the third annular member.

10. The seat belt retractor according to any one of claims 1 to 9, characterized in that: It also includes an end cover (9) arranged on one side of the frame (8), wherein a receiving cavity is formed in the end cover (9), and the conductive coil (3), the magnetic component (4) and the transmission assembly are arranged in the receiving cavity.

11. A seat belt assembly, characterized in that: The invention comprises a safety belt retractor according to any one of claims 1 to 10 and a safety belt, wherein the safety belt is wound around the belt reel (1).

12. A vehicle, characterized in that: The invention comprises a seat, and the seat belt assembly according to claim 11, wherein the seat belt assembly is provided at the seat of the vehicle.

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