Electromagnetic auxiliary force limiting safety belt retractor and safety belt assembly

Abstract

The utility model discloses an electromagnetic auxiliary force limiting safety belt retractor and a safety belt component, the retractor comprises a frame, one end of the frame is provided with an end cover, a permanent magnet group and a coil group are arranged in the end cover, the permanent magnet group is fixed on the inner ring of the end cover, the coil group is fixed on the inner ring of the permanent magnet group, and the coil group is fixed on the inner ring of the permanent magnet group. The permanent magnet set and the coil are located in the same plane, a tape winding drum is arranged in the frame, and a force limiting rod is arranged in the tape winding drum in a penetrating mode in the axial direction. According to the electromagnetic auxiliary force limiting safety belt retractor and the safety belt assembly, the coil assembly generates Lorentz force in the process of rotating in the permanent magnet assembly, so that the limited force can be adjusted according to passengers with different figures and weights, and the limited force of the force limiting rod is assisted to protect the passengers.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat belt technology, and more specifically, to an electromagnetically assisted force-limiting seat belt retractor and seat belt assembly. Background Technology

[0002] Current car seat belts typically incorporate mechanical force limiters to reduce the force exerted on the occupant's chest during a collision. However, existing mechanical force limiters suffer from issues such as unstable force limiting and the inability to adjust the force limit for occupants of different sizes and weights.

[0003] Therefore, there is an urgent need for a force-limiting seatbelt retractor that can at least partially solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this invention is to provide an electromagnetically assisted force-limiting seat belt retractor to solve the problems in the prior art. It can adjust the force limit according to the size and weight of the occupants, and the force limit of the auxiliary force-limiting rod protects the occupants.

[0005] This utility model provides an electromagnetically assisted force-limiting safety belt retractor, which includes: a frame, an end cap at one end of the frame, a permanent magnet assembly and a coil assembly inside the end cap, the permanent magnet assembly being fixed on the inner ring of the end cap, the coil assembly being fixed on the inner ring of the permanent magnet assembly, and the permanent magnet assembly and the coil being located in the same plane, and a winding drum being provided inside the frame, with a force-limiting rod passing through the winding drum along the axial direction.

[0006] In the electromagnetically assisted force-limiting safety belt retractor described above, preferably, a planetary gear train is provided between the reel and the end cap. The planetary gear train is used to amplify the Lorentz force generated by the coil group cutting the permanent magnet group.

[0007] In the electromagnetically assisted force-limiting seat belt retractor described above, preferably, the planetary gear system includes a sun gear, a rack, a gear carrier, and multiple planetary gears. The sun gear is fixed at the center of the end cover, the rack is rotatably mounted on the end cover along the axial direction, and the coil is wound around the rack. The gear carrier is fixed on the reel and can rotate with the reel. Each planetary gear is fixed on the gear carrier along the axial direction and can rotate around the shaft on the gear carrier. The outer circumference of each planetary gear meshes with the rack.

[0008] In the electromagnetically assisted force-limiting seat belt retractor described above, preferably, the sun gear, rack, planet gears, and each gear carrier are located in the same plane.

[0009] In the electromagnetically assisted force-limiting seat belt retractor described above, preferably, the end cap is fixed to the frame.

[0010] In the electromagnetically assisted force-limiting safety belt retractor described above, preferably, one end of the reel is provided with a shaft head.

[0011] In the electromagnetically assisted force-limiting seat belt retractor described above, preferably, one end of the force-limiting rod is fixed to the reel drum, and the other end is fixed to the shaft head.

[0012] In the electromagnetically assisted force-limiting safety belt retractor described above, preferably, a locking mechanism is provided at the other end of the frame opposite to the end cap for locking the belt drum.

[0013] This utility model also provides a seat belt assembly, including an electromagnetically assisted force-limiting seat belt retractor as described above and a seat belt, the seat belt being wound on a reel.

[0014] According to the electromagnetic assisted force-limiting seat belt retractor and seat belt assembly provided by this utility model, the coil group generates Lorentz magnetic force during the rotation of the permanent magnet group, thereby enabling the force-limiting force to be adjusted according to the size and weight of the occupants, and the force-limiting force of the auxiliary force-limiting rod to protect the occupants. Attached Figure Description

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the utility model will be further described below with reference to the accompanying drawings, wherein:

[0016] Figure 1 Exploded view of an embodiment of the electromagnetically assisted force-limiting safety belt retractor provided by this utility model;

[0017] Figure 2 An assembly diagram of an embodiment of the electromagnetically assisted force-limiting safety belt retractor provided by this utility model.

[0018] Explanation of reference numerals in the attached drawings: 1-End cap, 2-Permanent magnet assembly, 3-Sun gear, 4-Coil assembly, 5-Rack, 6-Planet gear, 7-Gear frame, 8-Force limiting rod, 9-Wrap drum, 10-Shaft head, 11-Frame, 12-Locking mechanism. Detailed Implementation

[0019] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0020] As used in this disclosure, words such as "including" or "contains" mean that the element preceding the word covers the element listed after the word, and do not exclude the possibility of covering other elements as well. Words such as "above" and "below" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] In this disclosure, when a specific component is described as being located between a first component and a second component, an intermediary component may or may not be present between the specific component and the first or second component. When a specific component is described as connecting to other components, the specific component may be directly connected to the other components without having an intermediary component, or it may not be directly connected to the other components but may have an intermediary component.

[0022] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0023] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0024] like Figure 1 and Figure 2 As shown, the electromagnetic assisted force-limiting safety belt retractor provided in this embodiment includes: a frame 11, an end cap 1 at one end of the frame 11, a permanent magnet assembly 2 and a coil assembly 4 inside the end cap 1, the permanent magnet assembly 2 being fixed on the inner ring of the end cap 1, the coil assembly 4 being fixed on the inner ring of the permanent magnet assembly 2, and the permanent magnet assembly 2 and the coil assembly 4 being located in the same plane, a winding drum 9 inside the frame 11, and a force-limiting rod 8 passing through the winding drum 9 along the axial direction.

[0025] The end cap 1 is fixed to the frame 11. It should be noted that this utility model does not specifically limit the fixing method of the end cap 1, the coil group 4 and the permanent magnet group 2.

[0026] Furthermore, a shaft head 10 is provided at one end of the tape reel 9.

[0027] Furthermore, one end of the force-limiting rod 8 is fixed to the tape reel 9 and can rotate with the tape reel 9, while the other end is fixed to the shaft head 10. In normal use, the tape reel 9 drives the force-limiting rod 8 to rotate, and the force-limiting rod 8 drives the shaft head 10 to rotate freely. In the event of a collision, the end of the force-limiting rod 8 connected to the shaft head 10 is blocked by the frame 11 and cannot rotate. The rotation of the tape reel 9 causes the force-limiting rod 8 to twist, thereby generating mechanical torque and participating in the absorption of collision energy.

[0028] Furthermore, a locking mechanism 12 is provided at the other end of the frame 11 opposite to the end cap 1 for locking the tape drum 9. The end cap 1 and the locking mechanism 12 are located at the two ends of the frame 11 respectively. The locking mechanism 12 is fixed on the frame 11 and cooperates with the tape drum 9 to realize the basic safety belt functions of the retractor, including vehicle feel, belt feel, and corner feel.

[0029] According to the electromagnetically assisted force-limiting seatbelt retractor described above, the coil assembly 4 generates Lorentz force during rotation within the permanent magnet assembly 2. This allows the force-limiting mechanism to be adjusted according to the size and weight of the occupant, and the force-limiting lever 8 further protects the occupant. Specifically, the faster the collision acceleration, the greater the generated magnetic force, and the greater the force acting on the seatbelt, thus providing better protection for the occupant.

[0030] Furthermore, a planetary gear train is provided between the tape reel 9 and the end cap 1. This planetary gear train amplifies the Lorentz force generated by the coil assembly 4 cutting the permanent magnet assembly 2. As a result, the force acting on the seat belt is greater, providing stronger protection for the occupants.

[0031] Specifically, the planetary gear train includes a sun gear 3, a rack 5, a gear carrier 7, and multiple planet gears 6. The sun gear 3 is fixed at the center of the end cover 1. The rack 5 is rotatably mounted on the end cover 1 along the axial direction, and the coil assembly 4 is wound around the rack 5. The gear carrier 7 is fixed to the tape reel 9 and can rotate with the tape reel 9. Each planet gear 6 is fixed to the gear carrier 7 along the axial direction and can rotate around an axis on the gear carrier 7. The outer periphery of each planet gear 6 meshes with the rack 5. In some embodiments of this invention, the number of planet gears 6 is three, and they are evenly distributed circumferentially on the radially outer side of the gear carrier 7. The gear carrier 7 is riveted to the tape reel 9. It should be noted that this invention does not specifically limit the number and distribution of the planet gears 6 or the fixing method of the gear carrier 7.

[0032] Furthermore, the sun gear 3, rack 5, planetary gears 6, and gear carrier 7 are located in the same plane. Specifically, during operation, when the seat belt webbing pulls the reel 9 to rotate, the reel 9 drives the gear carrier 7 to rotate. The rotation of the gear carrier 7 drives the rack 5 to rotate through the planetary gears 6. In the planetary gear system, the sun gear 3 is fixed, the gear carrier 7 is the driving member, and the rack 5 is the driven member. The transmission ratio is greater than 1. The rack 5 rotates faster relative to the gear carrier 7, which amplifies the Lorentz force generated by the coil group 4 on the rack 5 cutting the magnetic induction lines generated by the permanent magnet group 2. When a collision occurs, the seat belt is pulled out quickly, causing the reel 9 to rotate rapidly. The gear carrier 7 drives the rack 5 to rotate rapidly through the planetary gear system. The Lorentz force generated by the coil group 4 cutting the magnetic induction lines generated by the permanent magnet group 2 will prevent the rotation of the reel 9, thereby preventing the webbing from being pulled out. Together with the force limiter 8, this restrains the occupant to the seat, thus protecting the occupant.

[0033] Accordingly, this utility model also provides a seat belt assembly, including the above-mentioned electromagnetically assisted force-limiting seat belt retractor and a seat belt, the seat belt being wound on a reel.

[0034] The electromagnetic-assisted force-limiting seat belt retractor and seat belt assembly provided in this embodiment generate Lorentz force during the rotation of the coil group within the permanent magnet group. This allows for adjustment of the force limiting according to occupants of different body sizes and weights, thus assisting the mechanical force-limiting lever in protecting occupants. Furthermore, the Lorentz force generated by the coil group cutting the magnetic induction lines of the permanent magnet group can be amplified through the planetary gear system, resulting in a greater force acting on the seat belt and thus a better protective effect on the occupants.

[0035] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0036] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. An electromagnetically assisted force-limiting safety belt retractor, characterized in that, include: A frame, one end of which is provided with an end cap, and a permanent magnet assembly and a coil assembly are provided inside the end cap. The permanent magnet assembly is fixed on the inner ring of the end cap, and the coil assembly is fixed on the inner ring of the permanent magnet assembly. The permanent magnet assembly and the coil are located in the same plane. A tape reel is provided inside the frame, and a force limiting rod is passed through the tape reel along the axial direction.

2. The electromagnetically assisted force-limiting safety belt retractor according to claim 1, characterized in that, A planetary gear train is provided between the tape reel and the end cap. The planetary gear train is used to amplify the Lorentz force generated by the coil group cutting the permanent magnet group.

3. The electromagnetically assisted force-limiting safety belt retractor according to claim 2, characterized in that, The planetary gear train includes a sun gear, a rack, a gear carrier, and multiple planet gears. The sun gear is fixed at the center of the end cover. The rack is rotatably mounted on the end cover along the axial direction, and the coil is wound around the rack. The gear carrier is fixed on the tape reel and can rotate with the tape reel. Each planet gear is fixed on the gear carrier along the axial direction and can rotate around an axis on the gear carrier. The outer circumference of each planet gear meshes with the rack.

4. The electromagnetically assisted force-limiting safety belt retractor according to claim 3, characterized in that, The sun gear, the rack, each of the planet gears, and the gear carrier are located in the same plane.

5. The electromagnetically assisted force-limiting safety belt retractor according to claim 1, characterized in that, The end cap is fixed to the frame.

6. The electromagnetically assisted force-limiting safety belt retractor according to claim 1, characterized in that, One end of the tape reel is provided with a shaft head.

7. The electromagnetically assisted force-limiting safety belt retractor according to claim 6, characterized in that, One end of the force limiting rod is fixed to the tape drum, and the other end is fixed to the shaft head.

8. The electromagnetically assisted force-limiting safety belt retractor according to claim 1, characterized in that, A locking mechanism is provided at the other end of the frame opposite to the end cap for locking the tape reel.

9. A seatbelt assembly, characterized in that, Includes an electromagnetically assisted force-limiting safety belt retractor and a safety belt as described in any one of claims 1-8, wherein the safety belt is wound around the reel.

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