Fixed shaft with protruding structure, mandrel assembly and force limiting termination retractor

Abstract

The utility model discloses a fixed shaft with a protruding structure, a mandrel assembly and a force limiting termination retractor, and relates to the field of automobile safety belt accessories, the fixed shaft with the protruding structure comprises a main body part, the main body part is provided with an annular peripheral surface, and the peripheral surface is provided with a protrusion; according to the fixed shaft, the protrusions are arranged on the outer circumferential face of the fixed shaft body part, when collision, emergency braking and other situations occur, a safety belt is rapidly pulled out, the locking assembly drives the pawl to move into the movable groove, at the moment, the pawl is meshed with a tooth-shaped hole of the frame, and therefore the safety belt can be fixed. At the moment, the tension of the safety belt acts on the fixed shaft and then is transmitted to the pawl, the pawl is transmitted to the frame, meanwhile, the protrusion arranged on the main body portion of the fixed shaft is meshed with the tooth-shaped hole of the frame, locking is achieved, meanwhile, the tension of the safety belt is evenly shared by the pawl and the protrusion, the strength of the frame meets the requirement, and it is guaranteed that the retractor is safe and reliable.

Description

Technical Field

[0001] This utility model relates to the technical field of automotive seat belt accessories, and more specifically, to a fixed shaft with a raised structure. This utility model also relates to a spindle assembly including the aforementioned fixed shaft with the raised structure. Furthermore, this utility model relates to a force-limiting and termination retractor including the aforementioned spindle assembly. Background Technology

[0002] The retractor is a core component of car seat belts, accounting for 60%-95% of the seat belt cost. When the seat belt is fastened, the retractor automatically tightens it. In the event of emergency braking, a frontal collision, or a rollover, the passenger will cause the seat belt to be stretched rapidly and violently. At this moment, the locking function of the retractor can lock the seat belt instantly, keeping the passenger close to the seat and preventing them from being thrown out of the vehicle or injured in the collision.

[0003] To achieve the above objectives, the retractor frame needs to have a strength requirement of 16.5KN or higher. However, due to space and cost limitations in existing retractor structures, the retractor's inner frame is prone to damage during seatbelt force limiting when it engages with the fixed shaft, as the stress is concentrated in a certain part of the frame. Therefore, a fixed shaft with a protruding structure is developed to ensure that the frame structure is not damaged without any changes to the frame material and structure.

[0004] In summary, how to ensure the structural stability of the frame under the limit force of the seat belt, and make the overall retractor safer and more reliable, under the constraints of the retractor's structural space and cost, is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a fixed shaft with a protruding structure so as not to damage the structure of the frame and to ensure the safety and reliability of the retractor.

[0006] Another objective of this invention is to provide a mandrel assembly, including the aforementioned fixed shaft with a raised structure.

[0007] Another object of this utility model is to provide a force-limiting termination retractor, including the above-mentioned mandrel assembly.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A fixed shaft with a protruding structure includes:

[0010] The main body has an annular outer peripheral surface, on which protrusions are provided;

[0011] A connecting portion is formed on one side of the main body portion.

[0012] Preferably, multiple protrusions are provided, and each protrusion is elongated and its length direction is the same as the axial direction of the outer peripheral surface of the ring. When the force limiting device is used to limit the force of the retractor, the protrusion bears the same webbing tension as other components.

[0013] Preferably, a movable groove is formed on the end face of the main body away from the connecting part. The movable groove passes through a portion of the outer peripheral surface of the main body and forms an opening to limit the force and terminate the movement of the pawl of the retractor. The protrusion is provided on the portion of the outer peripheral surface of the main body away from the movable groove.

[0014] Preferably, the connecting portion extends horizontally outward along the central axis of the main body, and a through connecting hole is formed in the connecting portion, with a key body disposed in the connecting hole.

[0015] Preferably, an external thread is formed on the outer peripheral surface of the connecting part so that the connecting part is threadedly connected to the force-limiting nut of the force-limiting termination retractor.

[0016] A mandrel assembly, including the aforementioned fixed shaft with a protruding structure, further comprising:

[0017] The movable shaft is installed within the frame of the force-limiting and termination retractor and has an outer peripheral surface for webbing to be wound. The interior of the movable shaft is a hollow structure.

[0018] A force-limiting rod is inserted inside the moving shaft, and one end of the force-limiting rod is connected to the moving shaft;

[0019] A force-limiting nut is connected to the connecting part.

[0020] Preferably, it also includes a limiting pin, wherein the end of the moving shaft away from the fixed shaft has a through hole, and the limiting pin is inserted into the hole and cooperates with the force limiting rod inside the moving shaft.

[0021] Preferably, the force-limiting nut is polygonal in shape, and a polygonal hole is formed at one end of the moving shaft near the fixed shaft to mate with the force-limiting nut, so that the force-limiting nut can rotate in the same direction as the moving shaft.

[0022] A force-limiting termination retractor, comprising the aforementioned mandrel assembly, and further comprising:

[0023] The frame has a hollow supporting cavity;

[0024] A locking component is installed at one end of the frame;

[0025] A pawl is movably mounted on a fixed shaft and connected to the locking assembly;

[0026] A coil spring assembly is installed at the other end of the frame and mates with the moving shaft.

[0027] Preferably, one end of the frame has a toothed hole, the main body is located in the toothed hole, and the pawl and the protrusion both cooperate with the toothed hole.

[0028] The present invention provides a fixed shaft with a protruding structure, including a main body and a connecting part. The main body has an annular outer peripheral surface, on which a protrusion is provided. The connecting part is formed on one side of the main body and is connected to the force limiting rod of the force limiting termination retractor.

[0029] This utility model provides a fixed shaft with a raised structure. The raised structure is located on the outer circumferential surface of the fixed shaft body. In the event of a collision or emergency braking, the seatbelt is quickly pulled out, and the locking assembly moves the pawl into the movable groove. At this time, the pawl engages with the toothed hole of the frame. The tension of the seatbelt acts on the fixed shaft and is then transmitted to the pawl, which in turn transmits it to the frame. Simultaneously, the raised structure on the fixed shaft body engages with the toothed hole of the frame, achieving locking while the tension of the seatbelt is evenly distributed between the pawl and the raised structure, ensuring the frame strength meets requirements and guaranteeing the safety and reliability of the retractor. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 A schematic diagram of the overall structure of a fixed axis with a raised structure;

[0032] Figure 2 A schematic diagram of a fixed-axis structure with a raised feature;

[0033] Figure 3 This is an exploded view of the mandrel assembly.

[0034] Figure 4 This is a cross-sectional view of the mandrel assembly.

[0035] Figure 5 A schematic diagram of the overall structure of the force-limiting termination retractor;

[0036] Figure 6 A schematic diagram of the exploded structure of a force-limiting termination retractor;

[0037] Figure 7 A side view cross-sectional structural diagram of a force-limiting termination retractor.

[0038] Figures 1-7In the accompanying drawings, the reference numerals include:

[0039] 11. Main body; 12. Protrusion; 13. Connecting part; 14. Movable groove; 15. Key;

[0040] 21. Moving shaft; 22. Force limiting rod; 23. Force limiting nut; 24. Limiting pin;

[0041] 3. Frame; 4. Locking assembly; 5. Pawl; 6. Disc spring assembly; 7. Toothed hole; 8. Preload assembly; 9. Vehicle feel assembly. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar words used in this utility model do not indicate any order, quantity, or importance. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. Embodiments of this application disclose a fixed-axis and mandrel assembly with a protruding structure and a force-limiting termination retractor.

[0044] The core of this invention is to provide a fixed shaft with a protruding structure.

[0045] Another core aspect of this invention is to provide a mandrel assembly, including the aforementioned fixed shaft with a protruding structure.

[0046] Another core aspect of this utility model is to provide a force-limiting termination retractor, including the aforementioned mandrel assembly.

[0047] Please refer to Figures 1 to 2 .

[0048] The fixed axis of the protrusion structure provided by this utility model includes a main body 11 and a connecting part 13. The main body 11 has an annular outer peripheral surface and a protrusion 12 is provided on the outer peripheral surface. The connecting part 13 is formed on the side of the main body 11 facing the inside of the force-limiting termination retractor.

[0049] Specifically, when the fixed shaft with the protruding structure is used on the force-limiting and termination retractor, the rotational driving force of the seat belt on the moving shaft can be transmitted to the fixed shaft when the seat belt is limiting and locking. With the cooperation of other components of the force-limiting and termination retractor, the protrusion 12 on the fixed shaft engages with the frame of the force-limiting and termination retractor, increasing the contact position between the fixed shaft and the frame. This allows the force transmitted to the fixed shaft to be evenly distributed to various parts of the frame, making the frame less prone to breakage or damage.

[0050] The aforementioned fixed shaft with a raised structure effectively solves the problem that the current retractor experiences excessive force concentration at the interface between the fixed shaft and the frame when the seat belt is used for force limiting, which leads to easy damage to the frame structure.

[0051] The fixed shaft with a raised structure provided by this utility model will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0052] Based on any of the above embodiments, refer to Figure 1 Multiple protrusions 12 are provided, each protrusion 12 is elongated and its length direction is the same as the axial direction of the outer circumference of the ring. The protrusions 12 are used to bear the same webbing tension as other components when the force limiting termination retractor starts to limit the force.

[0053] Specifically, depending on the specific situation of the force-limiting termination retractor frame and the fixed shaft, when the retractor performs the force-limiting locking action, the parts of the fixed shaft with protrusions 12 are all engaged with the frame. That is, each protrusion 12 is staggered with the frame. When the fixed shaft is subjected to rotational force, the force is transmitted to the frame through each protrusion 12, thereby dispersing the force and preventing the frame from being stressed and breaking.

[0054] Based on any of the above embodiments, refer to Figure 1 A movable groove 14 is formed on the end face of the main body 11 away from the connecting part 13. The movable groove 14 passes through a portion of the outer peripheral surface of the main body 11 to form an opening, so as to limit the force and terminate the movement of the pawl of the retractor. A protrusion 12 is provided on the portion of the outer peripheral surface of the main body 11 away from the movable groove 14.

[0055] Specifically, according to the existing technology, when the force-limiting termination retractor performs the force-limiting locking action, its own locking component will drive the pawl to move in the movable groove 14, so that one side of the pawl is engaged with the fixed shaft and the other side is engaged with the frame. Since the frame remains absolutely stationary, the fixed shaft is restricted from rotating.

[0056] When the fixed axis is restricted from rotation, the force exerted by the seat belt on the fixed axis is distributed to the frame through the pawl and each protrusion 12. By distributing the movable groove 14 relative to the part of the main body 11 on which the protrusion 12 is provided, the frame can be subjected to more uniform force.

[0057] Based on any of the above embodiments, refer to Figure 2 The connecting part 13 extends horizontally outward along the central axis of the main body 11, and a through connecting hole is formed in the connecting part 13. A key body 15 is provided in the connecting hole, and the force limiting rod of the force limiting termination retractor is connected to the fixed shaft through the key body 15.

[0058] Specifically, the force-limiting rod of the force-limiting retractor is inserted into the frame, with one end connected to the moving shaft and the other end connected to the fixed shaft. One end of the car seat belt is wound around the moving shaft. When the passenger pulls the car seat belt, the moving shaft rotates accordingly, thereby causing the force-limiting rod and the fixed shaft to rotate synchronously. The force-limiting rod can be securely connected to the fixed shaft through a key 15 formed in the connecting hole, with sufficient strength to prevent connection failure caused by relative rotation between the fixed shaft and the force-limiting rod when the force limitation is terminated.

[0059] Based on any of the above embodiments, refer to Figure 2 An external thread is formed on the outer peripheral surface of the connecting part 13, and the force-limiting nut of the force-limiting termination retractor is connected to the connecting part 13 through the external thread.

[0060] Specifically, the aforementioned force-limiting nut is installed on the moving shaft and can rotate with the moving shaft. When the car is driving normally, the force-limiting nut is screwed onto the front end of the connecting part 13. When a collision or emergency braking occurs, the retractor activates the force-limiting lock, and the force-limiting nut can be further screwed into the connecting part 13. At this time, the seat belt can drive the moving shaft to continue rotating for a certain period of time to alleviate the force acting on the human body when the seat belt tightens rapidly. When one end of the force-limiting nut abuts against the end face of the main body 11 of the fixed shaft, the rotation stops.

[0061] Please refer to Figures 3 to 4 .

[0062] The mandrel assembly provided by this utility model includes the aforementioned fixed shaft with a protruding structure, and also includes a moving shaft 21, a force limiting rod 22, and a limiting nut 23. The moving shaft 21 is installed in the frame of the force limiting termination retractor and has an outer peripheral surface for webbing to be wound. The interior of the moving shaft 21 is a hollow structure. The force limiting rod 22 passes through the interior of the moving shaft 21. One end of the force limiting rod 22 is connected to the moving shaft 21, and the other end is connected to the fixed shaft. The force limiting nut 23 is threadedly connected to the connecting part 13.

[0063] Specifically, the moving shaft 21 is a cylindrical tubular structure and is rotatably mounted within the frame of the force-limiting termination retractor, with its outer circumference providing winding support for the seat belt. A fixed shaft with a protruding structure is located at one end of the moving shaft 21, and the force-limiting rod 22 passes through the interior of the moving shaft 21 with their axes coinciding.

[0064] Furthermore, both ends of the force limiting rod 22 are provided with key connection structures to initially connect the moving shaft 21, the fixed shaft and the force limiting rod 22, so as to realize the transmission of torque and ensure that when the seat belt is pulled out or retracted normally at a slow speed, the moving shaft 21 can drive the fixed shaft to rotate synchronously through the force limiting rod 22.

[0065] It should be noted that, according to existing technology, the force limiting bar 22 is preferably made of a metal material with a certain deformation capacity, so that when the retractor is locked with force limiting and the frame of the fixed shaft and the force limiting retractor is fixed, the force limiting bar 22 can be twisted by itself, so that the moving shaft 21 can be further rotated when subjected to the tension of the seat belt, that is, the seat belt can be partially released, avoiding excessive restraint force when the seat belt is tightened, which could cause injury to the human body, and also avoiding the seat belt being released too far, which would lead to the failure of protection for the human body.

[0066] Based on any of the above embodiments, refer to Figure 3 It also includes a limiting pin 24. The end of the moving shaft 21 away from the fixed shaft has a hole that passes through it. The limiting pin 24 is inserted into the hole and cooperates with the force limiting rod 22 inside the moving shaft 21.

[0067] Specifically, the hole on the moving shaft 21 is fully engaged with the limiting pin 24. When the limiting pin 24 is inserted into the hole, it can be constrained. One end of the limiting pin 24 inserted into the hole extends to the force limiting rod 22 and engages with the force limiting rod 22 through a specific structure to connect the moving shaft 21 and the force limiting rod 22 into one unit, thereby preventing the force limiting rod 22 from displacing in the axial direction.

[0068] Based on any of the above embodiments, refer to Figure 3 The force-limiting nut 23 is polygonal in shape, and the end of the moving shaft 21 near the fixed shaft has a polygonal hole that matches the force-limiting nut 23, so that the force-limiting nut 23 can rotate in the same direction as the moving shaft 21.

[0069] Specifically, the force limiting nut 23 can be hexagonal in shape. When it fits into the polygonal hole of the moving shaft 21, the force limiting nut 23 rotates synchronously with the rotation of the moving shaft 21. Since the force limiting nut 23 is used to connect with the connection part 13 of the fixed shaft, it can be realized that when it is restricted by the frame and kept stationary, the force limiting nut 23 and the moving shaft 21 can continue to rotate.

[0070] Please refer to Figures 5 to 7 .

[0071] The present invention provides a force-limiting termination retractor, including the aforementioned spindle assembly, as well as a frame 3, a locking assembly 4, a pawl 5, and a coil spring assembly 6. The frame 3 has a hollow support cavity, the spindle assembly is installed inside the frame 3, the locking assembly 4 is installed at one end of the frame 3 and cooperates with the fixed shaft, the pawl 5 is movably installed on the fixed shaft and connected to the locking assembly 4, and the coil spring assembly 6 is installed at the other end of the frame 3 and cooperates with the moving shaft 21.

[0072] Specifically, the frame 3 is a square hollow shell. The aforementioned spindle assembly is installed inside the frame 3, and the axial direction of the spindle assembly is parallel to the length direction of the frame 3. The locking assembly 4 is located at the end of the frame 3 near the fixed axis, and the coil spring assembly 6 is located at the end of the frame 3 away from the fixed axis.

[0073] When the seatbelt is in normal use, the coil spring assembly 6 provides winding force to the seatbelt. That is, when the passenger pulls the seatbelt outward, the coil spring assembly 6 deforms; when the seatbelt loosens, the coil spring assembly 6 returns to its original deformation and drives the seatbelt to wind up. The locking assembly 4 cooperates with the pawl 5. When the vehicle collides or brakes suddenly, the locking assembly 4, under its own inertia or other external forces, engages the pawl 5 between the fixed shaft and the frame 3, keeping the fixed shaft fixed and restricting the rotation of the moving shaft 21, thereby preventing the seatbelt from being pulled out and restraining the passenger in the seat for protection. The specific structures of the locking assembly 4 and the coil spring assembly 6 are conventional technologies in the field and will not be described in detail here.

[0074] Based on any of the above embodiments, refer to Figure 6 One end of the frame 3 has a toothed hole 7, the main body 11 of the fixed axis is located in the toothed hole 7, and the pawl and the protrusion 12 formed on the fixed axis both cooperate with the toothed hole 7.

[0075] Specifically, a circular hole is provided at the mating point between the frame 3 and the fixed shaft. The central axis of the circular hole coincides with the central axis of the fixed shaft. Rackets are evenly distributed on the inner wall of the circular hole. When the car is driving normally, the protrusion 12 on the surface of the fixed shaft and the pawl do not contact the ratchet. At this time, the fixed shaft rotates normally with the moving shaft 21. When the car collides or brakes suddenly, the part of the fixed shaft with the protrusion 12 engages with the ratchet. The pawl engages with the ratchet and is locked between the fixed shaft and the frame 3, thereby locking and fixing the fixed shaft.

[0076] It should also be noted that, for those skilled in the art, this force-limiting termination retractor can also include a pre-tensioning component 8. The pre-tensioning component 8, upon a car collision, uses high-pressure gas generated by gunpowder to push a ball bearing onto a pre-tensioning wheel mounted on the spindle assembly. The ball bearing and the pre-tensioning wheel cooperate to achieve pre-tensioning, improving protective performance. It can also include a vehicle sensing component 9, which, in conjunction with the locking component 4, monitors parameters such as vehicle tilt angle and acceleration in real time. When these parameters reach a certain value, the locking component 4 is triggered, fixing the fixed shaft to restrict the seatbelt from being pulled out.

[0077] The foregoing has provided a detailed description of the fixed shaft and mandrel assembly with a protruding structure, and the force-limiting termination retractor provided by this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A fixed shaft with a protruding structure for use in a force-limiting termination retractor, characterized in that, include: The main body (11) has an annular outer peripheral surface, and a protrusion (12) is provided on the outer peripheral surface. A connecting portion (13) is formed on one side of the main body portion (11).

2. A fixed shaft with a protruding structure according to claim 1, characterized in that, The protrusions (12) are provided in multiple ways. All of the protrusions (12) are elongated, and the length direction of each protrusion (12) is the same as the axial direction of the outer peripheral surface of the ring.

3. A fixed shaft with a protruding structure according to claim 1, characterized in that, A movable groove (14) is formed on the end face of the main body (11) away from the connecting part (13). The movable groove (14) penetrates part of the outer peripheral surface of the main body (11) and forms an opening for limiting the force to terminate the movement of the pawl of the retractor. The protrusion (12) is provided on part of the outer peripheral surface of the main body (11) away from the movable groove (14).

4. A fixed shaft with a protruding structure according to claim 1, characterized in that, The connecting part (13) extends horizontally outward along the central axis of the main body (11), and a through connecting hole is formed in the connecting part (13), and a key (15) is provided in the connecting hole.

5. A fixed shaft with a protruding structure according to any one of claims 1-4, characterized in that, The outer peripheral surface of the connecting part (13) is formed with an external thread so that the connecting part (13) is threadedly connected to the force-limiting nut of the force-limiting termination retractor.

6. A mandrel assembly, characterized in that, The fixed shaft with a protruding structure as described in any one of claims 1-5 further includes: The movable shaft (21) is installed in the frame of the force-limiting termination retractor and has an outer peripheral surface for webbing to be wound. The interior of the movable shaft (21) is a hollow structure. A force limiting rod (22) is inserted inside the moving shaft (21), and one end of the force limiting rod (22) is connected to the moving shaft (21); The force-limiting nut (23) is connected to the connecting part (13).

7. A mandrel assembly according to claim 6, characterized in that, It also includes a limiting pin (24), and the end of the moving shaft (21) away from the fixed shaft has a hole that passes through it. The limiting pin (24) is inserted into the hole and cooperates with the force limiting rod (22) inside the moving shaft (21).

8. A mandrel assembly according to claim 6, characterized in that, The force-limiting nut (23) is polygonal in shape. The end of the moving shaft (21) near the fixed shaft has a polygonal hole that matches the force-limiting nut (23), so that the force-limiting nut (23) can rotate in the same direction as the moving shaft (21).

9. A force-limiting termination retractor, characterized in that, Including the mandrel assembly as described in any one of claims 6-8, further comprising: The frame (3) has a hollow support cavity; A locking component (4) is installed at one end of the frame (3); The pawl (5) is movably mounted on the fixed shaft and connected to the locking assembly (4); The coil spring assembly (6) is installed at the other end of the frame (3) and cooperates with the moving shaft (21).

10. A force-limiting termination retractor according to claim 9, characterized in that, One end of the frame (3) is provided with a toothed hole (7), the main body (11) is located in the toothed hole (7), and the pawl (5) and the protrusion (12) both cooperate with the toothed hole (7).

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