Fixed shaft with insert, mandrel assembly and force limiting termination retractor

Abstract

The utility model discloses a dead shaft with an insert, a mandrel assembly and a force-limiting terminating retractor, and relates to the field of automobile safety belt accessories, the dead shaft with the insert comprises a main body part which is matched with a frame of the force-limiting terminating retractor; the connecting part is arranged on one side of the main body part and is coaxially distributed with the main body part; a reserved groove is formed in the main body part, an insert is fixed in the reserved groove, and the material strength of the insert is smaller than that of the main body part. By means of the arrangement of the insert, when an automobile collides or is braked emergently, the retractor locks the braid, at the moment, the pawl is meshed with the tooth-shaped part of the frame, and due to the fact that the material strength of the insert is low, the braid can be locked. Therefore, the tooth-shaped part can sink into the insert to be meshed and generate radial locking force, so that the acting force of the braid on the fixed shaft is jointly borne by multiple positions of the frame, the frame is not easy to break, and the overall safety and reliability are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive webbing accessories, and more specifically, to a fixed shaft with an insert. The present invention also relates to a core shaft assembly, including the fixed shaft with an insert. The present invention further relates to a force-limited stop retractor, including the core shaft assembly. Background Art

[0002] The retractor is the core component of the automotive webbing. It senses the speed of webbing pulling, the acceleration of the vehicle body or the tilt angle of the vehicle body through a sensing device. When the set value is reached, the locking assembly drives the pawl to open and clamp between the frame and the fixed axis to complete the locking. At this time, the webbing will not be able to be pulled out, thereby playing a webbing restraint role.

[0003] In order to achieve the above purpose, high requirements are placed on the strength of the frame to avoid direct damage to the frame when the pawl is engaged with the frame, which in turn causes locking failure. However, the existing retractor is limited by structural space and cost, making it difficult for the frame strength to meet the requirements. Therefore, a fixed axis with an insert is developed to increase the force bearing capacity of the frame under the premise of space and cost constraints, making the webbing force limit locking safer and more reliable.

[0004] In summary, how to improve the strength of the frame under the premise of space and cost constraints is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a fixed shaft with an insert, which effectively improves the stress level of the retractor frame and makes the whole structure safer and more reliable.

[0006] Another object of the present invention is to provide a core shaft assembly, comprising the fixed shaft with inserts.

[0007] Another object of the present invention is to provide a force-limiting and stopping retractor, comprising the core shaft assembly.

[0008] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0009] A fixed shaft with an insert, comprising:

[0010] A main body portion, wherein a reserved groove is formed on the main body portion, and an insert is fixed in the reserved groove;

[0011] The connecting portion is arranged on one side of the main body and is coaxially distributed with the main body.

[0012] Preferably, a movable groove is formed on a side of the main body away from the connecting portion, the movable groove is arranged opposite to the reserved groove, and the movable groove is used for allowing a pawl of the force-limiting termination retractor to move.

[0013] Preferably, the contact surface between the main body and the insert is provided with matching grooves and protrusions, and the side of the insert facing away from the main body is smoothly connected with the outer surface of the main body.

[0014] Preferably, the connecting part is a threaded cylindrical structure, and a thread is formed on the outer surface of the connecting part. The connecting part is open at one end away from the main body. The inner wall of the connecting part is provided with a key body, and the key body extends horizontally along the axial direction of the connecting part.

[0015] A core shaft assembly, comprising the fixed shaft with inserts, further comprising:

[0016] A moving shaft having a hollow structure;

[0017] A force limiting rod is installed inside the movable shaft and connects the movable shaft to the connecting portion;

[0018] A force-limiting nut, screwed onto the connecting portion and engaged with the moving shaft;

[0019] The limit stop pin is arranged between the movable shaft and the force limiting rod.

[0020] Preferably, the movable shaft has a closed end and an open end, and the open end cooperates with the force-limiting nut so that the force-limiting nut can rotate synchronously with the movable shaft in the same direction.

[0021] Preferably, both ends of the force-limiting rod are provided with key connectors, and the end of the limit stop pin close to the movable shaft is engaged with the limit stop pin.

[0022] A force-limited termination retractor includes the aforementioned core shaft assembly and further includes:

[0023] A frame having a hollow supporting space formed therein;

[0024] a coil spring assembly disposed on the frame and located at one end of the core shaft assembly;

[0025] a locking assembly mounted on the frame and located at the other end of the spindle assembly;

[0026] A pawl is connected to the locking assembly.

[0027] Preferably, a hole is opened at one end of the frame, a tooth-shaped portion is formed inside the hole, the pawl cooperates with the tooth-shaped portion, and the tooth-shaped portion is arranged around the outer periphery of the main body.

[0028] Preferably, a pre-tightening component is further included, and the pre-tightening component includes:

[0029] A preload pulley is mounted on the end of the moving shaft away from the fixed shaft;

[0030] A curved pipe, wherein a marble is installed inside the curved pipe, and a ball groove is formed on the preload wheel to cooperate with the marble;

[0031] A gas generator is connected to the bent pipe.

[0032] The utility model provides a fixed axis with an insert, including a main body and a connecting part. The main body cooperates with the frame of the force-limiting termination retractor. The connecting part is arranged on one side of the main body and is coaxially distributed with the main body. A reserved groove is opened on the main body, and an insert is fixed in the reserved groove. The material strength of the insert is less than the material strength of the main body.

[0033] The utility model provides a fixed shaft with an insert. By utilizing the arrangement of the insert, when the vehicle collides or brakes suddenly, the retractor locks the webbing. At this time, the pawl engages with the toothed portion of the frame. Since the material strength of the insert is relatively low, the toothed portion will sink into the insert and engage, generating a radial locking force. As a result, the force exerted by the webbing on the fixed shaft is shared by multiple parts of the frame, making the frame less likely to break, thereby ensuring the overall safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0035] Figure 1 Schematic diagram of the top view of the fixed axis with inserts;

[0036] Figure 2 It is a schematic diagram of the cross-sectional structure of a fixed axis with an insert;

[0037] Figure 3 This is a schematic diagram of the exploded structure of the core shaft assembly;

[0038] Figure 4 Schematic diagram of the cross-sectional structure of the core shaft assembly;

[0039] Figure 5 It is a side view structural diagram of the force-limited termination retractor;

[0040] Figure 6 This is a schematic diagram of the partial explosion structure of the force-limited termination retractor;

[0041] Figure 7 Schematic diagram of the explosion of a fixed shaft with inserts in a special case.

[0042] Figure 1-Figure 7 , the reference numerals include:

[0043] 11. Main body; 12. Connecting part; 121. Key body; 13. Insert; 14. Movable groove;

[0044] 21. Moving shaft; 22. Force-limiting rod; 221. Key connection; 23. Force-limiting nut; 24. Limit stop pin;

[0045] 3. Frame; 31. Toothed portion;

[0046] 4. Coil spring assembly; 5. Pawl;

[0047] 6. Preload assembly; 61. Preload wheel; 62. Bend pipe. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only 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 ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] Unless otherwise defined, the technical or scientific terms used in the present application shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. "First", "second" and similar words used in the present invention do not indicate any order, quantity or importance. "Connected" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly. The embodiments of the present application disclose a fixed shaft with an insert, a core shaft assembly and a force-limiting termination retractor.

[0050] The core of the utility model is to provide a fixed shaft with an insert, which is used for a force-limiting and stopping retractor for limiting and locking a webbing on an automobile.

[0051] Another core of the present invention is to provide a core shaft assembly, including the fixed shaft with inserts.

[0052] Another core of the present invention is to provide a force-limited termination retractor, comprising the core shaft assembly.

[0053] Please refer to Figures 1 to 2The fixed shaft with an insert provided by the present invention includes a main body 11 and a connecting portion 12. The main body 11 cooperates with the frame of the force-limited stop retractor. The connecting portion 12 is arranged on one side of the main body 11 and is coaxially distributed with the main body 11. The main body 11 has a reserved groove, in which an insert 13 is fixed. The material strength of the insert 13 is less than that of the main body 11.

[0054] Specifically, the insert 13 is integrally joined to the main body 11, and the specific joining method is not limited to split molding, riveting, or limit pin connection. After joining, there is no abnormal sound and the device will not loosen when subjected to the maximum force applied by the webbing. When the fixed shaft with the insert is used in a force-limiting stop retractor, when the webbing is locked and force-limited by the force-limiting stop retractor, due to the relatively low material strength of the insert 13, the frame of the force-limiting stop retractor can partially sink into the insert 13 to achieve engagement, thereby increasing the number of contact points between the frame and the fixed shaft. That is, the force applied by the webbing on the fixed shaft can be dispersed and transmitted to the frame through multiple contact points, making the frame less susceptible to rupture or displacement.

[0055] The above-mentioned fixed axis with insert effectively solves the problem that when the current retractor locks the seat belt, the contact point between the fixed axis and the frame is single, causing the force on the frame to be too concentrated. The frame is limited by structural space and cost, resulting in the frame breaking when the force is too concentrated, thereby causing the webbing locking to fail.

[0056] The fixed axis with inserts provided by the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0057] In a specific embodiment, reference Figure 1 A movable groove 14 is formed on one side of the main body 11 away from the connecting portion 12. The movable groove 14 is distributed opposite to the reserved groove. The movable groove 14 is used for limiting the movement of the pawl of the retractor.

[0058] Specifically, when the force-limited termination retractor performs the locking action, the locking assembly it possesses will drive the pawl to move in the movable groove 14 to engage with the frame of the force-limited termination retractor. The engaged pawl can keep the fixed shaft and the frame stationary at the same time. Since the fixed shaft remains stationary, the rotation of the movable shaft is restricted, thereby achieving locking.

[0059] Based on any of the above embodiments, Figure 1 The contact surface between the main body 11 and the insert 13 is provided with matching grooves and protrusions, and the side of the insert 13 facing away from the main body 11 is smoothly connected with the outer surface of the main body 11.

[0060] Based on any of the above embodiments, Figure 2The connecting portion 12 is a threaded cylindrical structure, with threads formed on the outer surface of the connecting portion 12. The connecting portion 12 is open at one end away from the main body 11. A key body 121 is provided on the inner wall of the connecting portion 12, and the key body 121 extends horizontally along the axial direction of the connecting portion 12.

[0061] Specifically, the connecting part 12 cooperates with the force limiting nut 23 of the force limiting termination retractor, and the force limiting nut 23 is screwed onto the outside of the connecting part 12. When the fixed axis is fixed, the force of the webbing will drive the dynamic shaft 21 of the force limiting termination retractor to continue to rotate, so that the limit nut is screwed into the connecting part 12 until it abuts against the end face of the main body 11, thereby alleviating the restraining force acting on the human body when the webbing is quickly locked.

[0062] It should also be noted that the key body 121 is used to cooperate with the force limiting rod of the force limiting termination retractor to connect the force limiting rod with the fixed shaft to realize transmission. Specifically, when the webbing applies force to the dynamic shaft, the dynamic shaft transmits the torque to the force limiting rod, and the force limiting rod then transmits the torque to the fixed shaft.

[0063] In some other embodiments, reference Figure 7 The insert 13 is riveted onto the main body 11 and secured with rivets. Multiple splines are provided on the main body 11, and keyways are provided on the insert 13 to further enhance the stability of the connection between the two. The insert 13 and the main body 11 can be connected using a variety of methods, including splines, separate molding, riveting, and rivets. The connection is noiseless and does not loosen even when subjected to the maximum load of the webbing.

[0064] Please refer to Figures 3 and 4 The utility model provides a core shaft assembly for a force-limited termination retractor of an automobile webbing, comprising the above-mentioned fixed shaft with an insert, a dynamic shaft 21, a force-limiting rod 22, a force-limiting nut 23 and a limit stop pin 24. The dynamic shaft 21 is installed in the frame of the force-limited termination retractor. The dynamic shaft 21 is a hollow structure. The fixed shaft is installed at one end of the dynamic shaft 21. The force-limiting rod 22 is installed inside the dynamic shaft 21 and connects the dynamic shaft 21 with the connecting part 12. The force-limiting nut 23 is screwed onto the connecting part 12 and clamped with the dynamic shaft 21. The limit stop pin 24 is arranged between the dynamic shaft 21 and the force-limiting rod 22.

[0065] Specifically, the core shaft assembly of the fixed axis with an insert is used for a force-limiting termination retractor. When the webbing is locked and force-limited by the force-limiting termination retractor, due to the low material strength of the insert 13, the frame of the force-limiting termination retractor can be partially sunk into the insert 13 to achieve engagement, thereby increasing the contact points between the frame and the fixed axis, that is, the force exerted by the webbing on the fixed axis can be dispersed and transmitted to the frame through multiple contact points, making the frame less likely to break or displace.

[0066] In a specific embodiment provided in the present application, the dynamic shaft 21 has a closed end and an open end, and the open end is configured to match the shape of the force-limiting nut 23 so that the force-limiting nut 23 can rotate synchronously with the dynamic shaft 21 in the same direction.

[0067] Specifically, the shape of the force-limiting nut 23 is designed as a special structure, which can be roughly polygonal and provided with curved or straight protrusions. The open end of the dynamic shaft 21 is correspondingly set as a polygonal hole and is provided with a groove that matches the protrusion. The force-limiting nut 23 is matched with the open end of the dynamic shaft 21 through this special structure, so that the torque of the dynamic shaft 21 can be transmitted to the force-limiting nut 23, so that it can be screwed in along the above-mentioned connecting part 12.

[0068] Based on any of the above embodiments, Figure 2 Both ends of the force limiting rod 22 are provided with key connectors 221 to connect the movable shaft 21 and the fixed shaft, and the end of the limit stop pin 24 close to the movable shaft 21 is engaged with the limit stop pin 24.

[0069] Specifically, the torque is transmitted by setting the key connector 221. The specific structure of the key connector 221 and the matching structure of the movable shaft 21, the fixed shaft and the key connector 221 are all conventional technologies and are not limited here.

[0070] The pin hole opened on the dynamic shaft 21 fully cooperates with the limit stop pin 24. When the limit stop pin 24 is inserted into the hole body, it can be constrained. One end of the limit stop pin 24 inserted into the hole extends to the force limiting rod 22 and cooperates with the force limiting rod 22 through a specific structure, connecting the dynamic shaft 21 and the force limiting rod 22 as a whole to prevent the force limiting rod 22 from being displaced in the axial direction.

[0071] Please refer to Figures 5 and 6 The utility model provides a force-limiting termination retractor, which includes the above-mentioned core shaft assembly, and also includes a frame 3, a coil spring assembly 4, a locking assembly and a pawl 5. A hollow supporting space is formed inside the frame 3, the core shaft assembly is installed in the frame 3, the coil spring assembly 4 is installed on the frame and is located at one end of the core shaft assembly, the locking assembly is installed on the frame and is located at the other end of the core shaft assembly, the pawl 5 is connected to the locking assembly, and the pawl 5 is arranged in cooperation with the fixed axis.

[0072] Specifically, when the above-mentioned force-limiting termination retractor locks and limits the force of the webbing, due to the low material strength of the insert 13, the frame 3 can be partially sunk into the insert 13 to achieve engagement, thereby increasing the contact points between the frame 3 and the fixed axis, that is, the force exerted by the webbing on the fixed axis can be dispersedly transmitted to the frame 3 through multiple contact points, making the frame 3 less likely to break or displace.

[0073] It should be noted that the locking assembly (not shown in the drawings) is located at the end of the frame 3 closest to the fixed axis, and the coil spring assembly 4 is located at the end of the frame 3 farther from the fixed axis. During normal seatbelt use, the coil spring assembly 4 provides the retraction force for the seatbelt. Specifically, when the passenger pulls out the seatbelt, the coil spring assembly 4 deforms; when the seatbelt is released, the coil spring assembly 4 recovers its deformation and drives the seatbelt to retract. The specific structures of the locking assembly and coil spring assembly 4 are well known to those skilled in the art and will not be detailed here.

[0074] Based on any of the above embodiments, Figure 5 A hole is formed at one end of the frame 3 , and a toothed portion 31 is formed inside the hole. The pawl 5 cooperates with the toothed portion 31 , and the toothed portion 31 is arranged around the outer periphery of the main body 11 .

[0075] Specifically, when the webbing is in normal use, as the webbing is pulled out or retracted, the dynamic shaft 21 drives the fixed shaft to rotate within the hole through the force-limiting rod 22. When the retractor is locked, the locking assembly drives the pawl 5 to engage the toothed portion 31, locking the fixed shaft so that it cannot rotate, thereby locking the webbing. The specific structure and operating principle of the locking assembly are well known to those skilled in the art and will not be described in detail here.

[0076] Based on any of the above embodiments, Figure 6 The force-limiting termination retractor also includes a pre-tensioning assembly 6, which further includes a pre-tensioning wheel 61, a curved pipe 62 and a gas generator. The pre-tensioning wheel 61 is installed at the end of the dynamic shaft 21 away from the fixed axis. The curved pipe 62 is filled with marbles. The pre-tensioning wheel 61 is provided with a ball groove that cooperates with the marbles. The gas generator is connected to the curved pipe 62 to introduce high-pressure gas into the curved pipe 62.

[0077] Specifically, the pre-tensioning wheel 61 has two ports, and the marbles are installed inside the curved pipe 62. One of the ports corresponds to the pre-tensioning wheel 61, and the other port is connected to the gas generator. When the sensor detects that the acceleration, tilt angle and other parameters of the vehicle exceed the set value, the gas generator (not shown in the attached figure) generates high-pressure explosion gas. The high-pressure explosion gas enters the curved pipe 62, pushing the marbles to push the pre-tensioning wheel 61 to rotate with a certain impact force, and the pre-tensioning wheel 61 drives the drive shaft 21 to rotate to rewind and tighten the webbing.

[0078] The above describes in detail the fixed shaft and core shaft assembly with inserts and the force-limited stop retractor provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above examples is intended only to facilitate understanding of the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A fixed shaft with an insert, used for a force-limiting stop retractor, characterized in that: include: A main body (11), wherein a reserved groove is formed on the main body (11), and an insert (13) is fixed in the reserved groove; The connecting portion (12) is arranged on one side of the main body portion (11) and is coaxially distributed with the main body portion (11).

2. A fixed shaft with an insert according to claim 1, characterized in that: A movable groove (14) is formed on one side of the main body (11) facing away from the connecting portion (12), the movable groove (14) being arranged opposite to the reserved groove, and the movable groove (14) is used for movement of a pawl of the force-limiting termination retractor.

3. A fixed shaft with an insert according to claim 1, characterized in that: The contact surfaces of the main body (11) and the insert (13) are provided with matching grooves and protrusions, and a surface of the insert (13) facing away from the main body (11) is smoothly connected to the outer surface of the main body (11).

4. A fixed shaft with an insert according to any one of claims 1 to 3, characterized in that: The connecting portion (12) is a threaded cylindrical structure, and a thread is formed on the outer surface of the connecting portion (12). One end of the connecting portion (12) away from the main body (11) is open, and a key body (121) is provided on the inner wall of the connecting portion (12). The key body (121) extends horizontally along the axial direction of the connecting portion (12).

5. A spindle assembly, characterized in that: The fixed shaft with insert according to any one of claims 1 to 4, further comprising: A movable shaft (21), wherein the movable shaft (21) is a hollow structure; A force limiting rod (22) is installed inside the movable shaft (21) and connects the movable shaft (21) to the connecting portion (12); A force-limiting nut (23) is screwed onto the connecting portion (12) and is engaged with the movable shaft (21); The limiting stop pin (24) is arranged between the movable shaft (21) and the force limiting rod (22).

6. A spindle assembly according to claim 5, characterized in that: The movable shaft (21) has a closed end and an open end, and the open end cooperates with the force-limiting nut (23) so that the force-limiting nut (23) can rotate synchronously with the movable shaft (21) in the same direction.

7. The spindle assembly according to claim 5, characterized in that: Both ends of the force-limiting rod (22) are provided with key connectors (221), and one end of the position-limiting stop pin (24) close to the movable shaft (21) is engaged with the position-limiting stop pin (24).

8. A force-limited termination retractor, characterized in that: The core shaft assembly according to any one of claims 5 to 7 further comprises: A frame (3) having a hollow support space formed therein; a coil spring assembly (4) disposed on the frame (3) and located at one end of the core shaft assembly; A locking assembly mounted on the frame (3) and located at the other end of the spindle assembly; A pawl (5) is connected to the locking assembly.

9. The force-limited termination retractor according to claim 8, characterized in that: A hole is formed at one end of the frame (3), a tooth-shaped portion (31) is formed inside the hole, the pawl (5) cooperates with the tooth-shaped portion (31), and the tooth-shaped portion (31) is arranged around the outer periphery of the main body (11).

10. The force-limited termination retractor according to claim 8, characterized in that: It also includes a pre-tightening component (6), which includes: A preload wheel (61) is mounted on an end of the movable shaft (21) away from the fixed shaft; A curved pipe (62), wherein a marble is installed inside the curved pipe (62), and a ball groove is provided on the preload wheel (61) to cooperate with the marble; A gas generator is connected to the bent pipe (62).

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