CN220096317U - Safety belt retractor and safety belt - Google Patents

Abstract

The utility model provides a seatbelt retractor and a seatbelt, the seatbelt retractor includes: the device comprises a mandrel, a torsion bar, a first pin and a brake shaft; the first end of the torsion bar is coaxially and fixedly connected with the brake shaft, and the second end of the torsion bar is coaxially and fixedly connected with the mandrel; the brake shaft is locked when the seatbelt retractor is in a braking state; the first end of the first pin deviates from the central axis of the brake shaft to form fixed connection with the brake shaft, and the second end stretches into a first eccentric shaft hole corresponding to the first pin and arranged on the mandrel; when the seat belt retractor is in a braking state, the first pin can be plastically deformed under the action of the first eccentric shaft hole along with the rotation of the spindle when the spindle rotates due to the deformation of the torsion bar. The two ends of the first pin of the safety belt retractor respectively keep synchronous motion with the brake shaft and the mandrel, and can directly participate in the force limiting process when the torsion bar is distorted, so that the force limiting threshold of the safety belt retractor is improved, and meanwhile, the reliability of the safety belt retractor is ensured.

Description

Safety belt retractor and safety belt

Technical Field

The utility model relates to the technical field of safety belt retractors, in particular to a safety belt retractor and a safety belt.

Background

In order to protect the personal safety of passengers, the safety belt retractor can enter a braking state to lock the mandrel for winding the webbing, so that the webbing cannot be pulled out, and the human body is bound on the seat of the vehicle. However, when the vehicle is suddenly stopped, the webbing can exert very large pressure on the human body in the process of overcoming the inertia of the human body, and the human body is easy to be squeezed and damaged.

In the conventional seatbelt retractor, the pressure of the webbing on the human body is generally released by twisting deformation of the torsion bar. Specifically, the spindle and the brake shaft are connected by a torsion bar. When a safety accident occurs, the safety belt retractor enters a braking state, the braking shaft is locked firstly, the inertia of a human body still pulls the webbing outwards, when the pulling force of the webbing reaches the yield limit of the torsion bar, the torsion bar generates torsion deformation, the mandrel rotates along with the torsion deformation of the torsion bar and emits a small section of webbing, so that the pressure of the webbing on the human body is released, the force limiting process is completed, and the human body is ensured not to be damaged by the binding force of the webbing.

However, in the prior art, when the pressure is released by the twisting deformation of the single torsion bar, the released energy is limited, and the force is often limited for passengers with heavy bodies. While the pressure is released through the twisting deformation of the double torsion bar, although the force limiting threshold value provided by the torsion bar is effectively increased, the double torsion bar type safety belt retractor needs to release the pressure of the webbing by the two torsion bars together through the linkage piece, has a complex structure, and is easy to cause insufficient force limiting due to the damage of the linkage piece, and has low reliability. Therefore, it is a technical problem to be solved how to ensure the reliability of the seatbelt retractor while increasing the force limiting threshold of the seatbelt retractor.

Disclosure of Invention

The utility model provides a safety belt retractor and a safety belt, which are used for solving the problem that the prior safety belt retractor cannot improve the force limiting threshold and ensure the reliability.

An embodiment of the present utility model provides a seatbelt retractor including: the device comprises a mandrel, a torsion bar, a first pin and a brake shaft; the first end of the torsion bar is coaxially and fixedly connected with the brake shaft, and the second end of the torsion bar is coaxially and fixedly connected with the mandrel, so that the brake shaft is connected with the mandrel through the torsion bar; wherein the brake shaft is locked when the seatbelt retractor is in a braked state;

the first end of the first pin deviates from the central axis of the brake shaft to form fixed connection with the brake shaft, and the second end stretches into a first eccentric shaft hole corresponding to the first pin and arranged on the mandrel;

when the seat belt retractor is in a braking state, the first pin can be plastically deformed under the action of the first eccentric shaft hole along with the rotation of the spindle when the spindle rotates due to the deformation of the torsion bar.

Preferably, the seatbelt retractor further comprises a connecting sleeve; the connecting sleeve is fixed on the brake shaft; the first end of the first pin is fixed on the connecting sleeve and is positioned at an eccentric position relative to the central axis of the brake shaft, so that the first end of the first pin is fixedly connected with the brake shaft.

Preferably, the connecting sleeve is arranged in a circular shape; the annular connecting sleeve is non-rotatably sleeved on the brake shaft.

Preferably, the connecting sleeve is provided with a guide groove;

the guide groove is shaped in such a way that when the first pin is plastically deformed under the action of the first eccentric shaft hole along with the rotation of the mandrel, the deformed part of the first pin is pulled away from the first eccentric shaft hole along with the rotation of the mandrel and is just contained in the guide groove.

Preferably, the guide groove is a circular guide groove connected end to end; the center of the circular ring guide slot coincides with the central axis of the brake shaft.

Preferably, the first end of the first pin is provided with a clamping structure; the connecting sleeve is provided with a clamping structure corresponding to the clamping structure; when the clamping structure and the clamping structure are mutually clamped, the first pin and the connecting sleeve form fixed connection; when the mutual clamping of the clamping structure and the clamping structure is released, the first pin can be separated from the connecting sleeve.

Preferably, the first pin is determined from candidate pins of different types according to the target force limiting threshold; different types of candidate pins correspond to different force limiting thresholds.

Preferably, the seatbelt retractor further includes a second pin; the first end of the second pin deviates from the central axis of the brake shaft to form fixed connection with the brake shaft, and the second end stretches into a second eccentric shaft hole of the corresponding second pin arranged on the mandrel;

when the seat belt retractor is in a braking state, the second pin can rotate along with the mandrel when the mandrel rotates due to deformation of the torsion bar, and plastic deformation can be synchronously generated with the first pin under the action of the second eccentric shaft hole.

The embodiment of the utility model also provides another seatbelt retractor, which includes: the device comprises a mandrel, a torsion bar, a first pin and a brake shaft; the first end of the torsion bar is coaxially and fixedly connected with the brake shaft, and the second end of the torsion bar is coaxially and fixedly connected with the mandrel, so that the brake shaft is connected with the mandrel through the torsion bar; wherein the brake shaft is locked when the seatbelt retractor is in a braked state;

the first end of the first pin deviates from the central axis of the mandrel to form fixed connection with the mandrel, and the second end stretches into a first eccentric shaft hole of the corresponding first pin arranged on the brake shaft;

when the seat belt retractor is in a braking state, the first pin can rotate along with the mandrel when the mandrel rotates due to deformation of the torsion bar, and plastic deformation occurs under the action of the first eccentric shaft hole.

The present utility model also provides a seat belt, including: the device comprises a mandrel, a torsion bar, a first pin and a brake shaft; the first end of the torsion bar is coaxially and fixedly connected with the brake shaft, and the second end of the torsion bar is coaxially and fixedly connected with the mandrel, so that the brake shaft is connected with the mandrel through the torsion bar; wherein the brake shaft is locked when the seatbelt retractor is in a braked state;

the first end of the first pin deviates from the central axis of the brake shaft to form fixed connection with the brake shaft, and the second end stretches into a first eccentric shaft hole corresponding to the first pin and arranged on the mandrel; or the first end of the first pin deviates from the central axis of the mandrel to form fixed connection with the mandrel, and the second end stretches into a first eccentric shaft hole of the corresponding first pin arranged on the brake shaft;

when the seat belt retractor is in a braking state, the first pin can be plastically deformed under the action of the first eccentric shaft hole along with the rotation of the spindle when the spindle rotates due to the deformation of the torsion bar.

Compared with the prior art, the utility model has the following advantages:

an embodiment of the present utility model provides a seatbelt retractor including: the device comprises a mandrel, a torsion bar, a first pin and a brake shaft; the first end of the torsion bar is coaxially and fixedly connected with the brake shaft, and the second end of the torsion bar is coaxially and fixedly connected with the mandrel, so that the brake shaft is connected with the mandrel through the torsion bar; wherein the brake shaft is locked when the seatbelt retractor is in a braked state; the first end of the first pin deviates from the central axis of the brake shaft to form fixed connection with the brake shaft, and the second end stretches into a first eccentric shaft hole corresponding to the first pin and arranged on the mandrel; when the seat belt retractor is in a braking state, the first pin can be plastically deformed under the action of the first eccentric shaft hole along with the rotation of the spindle when the spindle rotates due to the deformation of the torsion bar.

According to the safety belt retractor, the pin is matched with the torsion bar to release the pressure of the webbing, the two ends of the pin are respectively connected with the brake shaft and the mandrel, when the pin is in a braking state, and when the mandrel rotates along with the torsion bar, the deformation of the mandrel is carried out, the pin provides partial resistance through the deformation of the pin, so that the force limiting process is participated, and the force limiting threshold of the safety belt retractor is effectively improved; according to the structure for improving the force limiting threshold, as the linkage piece is not required, the structure for improving the force limiting threshold is not damaged when the structure is not in a braking state, and the reliability of the force limiting threshold improving structure is fully ensured.

Drawings

Fig. 1 is a sectional view of a seatbelt retractor provided by an embodiment of the present utility model;

fig. 2 is a schematic structural view of a seatbelt retractor according to an embodiment of the present utility model;

FIG. 3 is a schematic view of the connection of the first pin to the brake shaft according to an embodiment of the present utility model;

reference numerals:

a seatbelt retractor 01;

a mandrel 10; a first eccentric shaft hole 11;

a torsion bar 20; a first pin 30;

a brake shaft 40; the connecting sleeve 41; a guide slot 411; a circular guide slot 412;

a snap-in structure 50; a clamping structure 60;

a second pin 70; and a second eccentric shaft hole 80.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than those herein described, and those skilled in the art will readily appreciate that the present utility model may be similarly embodied without departing from the spirit or essential characteristics thereof, and therefore the present utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The safety belt retractor is used for protecting personal safety of passengers, is provided with a belt sensing assembly, a car sensing assembly and the like, can be in a braking state when a car is suddenly stopped, turned on one's side and the like, and locks the rotation of the mandrel, so that the webbing can not be pulled out, and the human body is bound on the seat of the car. However, when the vehicle is suddenly stopped, the webbing can exert very large pressure on the human body in the process of overcoming the inertia of the human body, and the human body is easy to be squeezed and damaged.

In this regard, the conventional seatbelt retractor releases the pressure of the webbing against the human body mainly by the twisting deformation of the torsion bar. Specifically, the mandrel and the brake shaft are connected through a torsion bar. When a safety accident occurs, the brake shaft is braked first, and the torsion bar simultaneously inhibits the rotation of the mandrel, so that the webbing cannot be pulled out. At this time, the inertia of the human body makes the human body continuously pull the webbing and the pulling force continuously increases, and the reactive force of the pulling force, namely the binding force of the webbing to the human body, is also increased. When the tension of the braid exceeds the yield limit of the torsion bar, the torsion bar generates torsion deformation, so that the mandrel rotates relative to the locked brake shaft and releases a small section of braid, the binding force of the braid on the human body is released, and the binding force of the braid on the human body is limited on a relatively stable force limiting value, thereby ensuring that the human body is not damaged by the extrusion of the braid.

The torsion bar type safety belt retractor mainly comprises a single torsion bar and a double torsion bar. However, when the pressure is released by twisting deformation of the single torsion bar, the released energy is limited, and a situation of insufficient force limitation is likely to occur for a passenger having a large weight.

When the pressure is released through the torsional deformation of the double torsion bars, besides the two ends of the main torsion bar are respectively and fixedly connected with the mandrel and the brake shaft in a coaxial way, the rotation of the mandrel is transmitted to the secondary torsion bar through the linkage piece, so that the main torsion bar and the secondary torsion bar can participate in the force limiting process together. However, in the dual torsion bar retractor in the prior art, the main torsion bar and the secondary torsion bar are required to be mutually connected and synchronously rotated through the linkage piece, so that the linkage piece is easily damaged in daily webbing retraction and retraction actions, and the secondary torsion bar possibly cannot participate in the force limiting process. Therefore, how to increase the force limiting threshold of the seatbelt retractor and ensure the reliability of the structure for increasing the force limiting threshold has become a technical problem to be solved

The utility model provides a feasible safety belt retractor, which aims to solve the problem that the prior safety belt retractor cannot simultaneously consider the force limiting degree and the reliability when releasing the pressure of a woven belt on a human body. The safety belt retractor limits force by matching the first pin with the torsion bar, meanwhile, the first end of the first pin and the brake shaft form eccentric fixation, and the other end of the first pin extends into a first eccentric shaft hole corresponding to the first pin arranged on the mandrel. When the safety belt is in a braking state, the first pin can directly sense the rotation of the mandrel caused by the deformation of the torsion bar, so that the plastic deformation is correspondingly generated to participate in the force limiting process. The first pin of this kind of safety belt retractor is in braking state at the safety belt retractor, and the dabber takes place when torsion bar warp and rotates, and directly participates in the limit force process, and need not the motion state of linkage transmission dabber, has avoided the limit force inadequately that the damage of linkage led to the reliability of limit force threshold value promotion structure has been ensured.

The seatbelt retractor is shown in fig. 1 and 2 in particular, fig. 1 is a sectional view of the seatbelt retractor, and fig. 2 is a schematic structural view of a seatbelt retractor corresponding to fig. 1. As shown in fig. 1 and 2, the seatbelt retractor 01 includes: the torque rod 20, the first pin 30, the brake shaft 40, and the mandrel 10; the first end of the torsion bar 20 is coaxially and fixedly connected with the brake shaft 40, and the second end is coaxially and fixedly connected with the mandrel 10, so that the brake shaft 40 is connected with the mandrel 10 through the torsion bar 20; wherein the brake shaft 40 is locked when the seatbelt retractor 01 is in a braked state;

the first end of the first pin 30 deviates from the central axis of the brake shaft 40 to form fixed connection with the brake shaft 40, and the second end stretches into the first eccentric shaft hole 11 of the corresponding first pin 30 arranged on the mandrel 10;

when the seatbelt retractor 01 is in a braking state, the first pin 30 can be plastically deformed by the first eccentric shaft hole 11 with the rotation of the spindle 10 when the spindle 10 rotates due to the deformation of the torsion bar 20.

In the seatbelt retractor 01, the spindle 10 and the brake shaft 40 are connected by the torsion bar 20, so that the spindle 10, the brake shaft 40, and the torsion bar 20 can coaxially rotate. When the seatbelt retractor 01 is in an unbraked state, the torsion bar 20 maintains the brake shaft 40 in a state of uniform movement with the spindle 10.

Specifically, when the spindle 10 is in the unbraked state, the brake shaft 40 is in the free state, and when the spindle 10 rotates with the pulling-out action of the webbing, the torsion bar 20 transmits the rotation of the spindle 10 to the brake shaft 40, so that the brake shaft 40 rotates with the rotation of the spindle 10, thereby enabling the webbing to be pulled out normally. When the seatbelt retractor 01 is in a braking state (generally, due to a collision), the brake shaft 40 is locked and cannot rotate, the torsion bar 20 also limits the rotation of the spindle 10, and if the tension of the webbing applies a load to the torsion bar 20 greater than the yield limit of the torsion bar 20, the second end of the torsion bar 20 will be deformed in torsion relative to the first end, and the spindle 10 will be partially rotated to release a webbing, so that the restraining force of the webbing is limited to a relatively stable force limit value.

In order to facilitate installation and reliable rotation, the connection between the two ends of the torsion bar 20 and the spindle 10 and the brake shaft 40 may be spline connection, or may be interference connection, clamping connection, or the like, which is not limited herein. When the seatbelt retractor 01 is brought into a braking state, the brake shaft 40 may be locked by a vehicle-sensing unit, a belt-sensing unit, or the like, and the specific configurations of the vehicle-sensing unit and the belt-sensing unit are not limited.

In this embodiment, the first pin 30 is a component that assists the torsion bar 20 in releasing webbing pressure. And, the first end of the first pin 30 is offset from the central axis of the stopper shaft 40 to form a fixed connection with the stopper shaft 40 such that the moving state of the first end of the first pin 30 is always synchronized with the stopper shaft 40. The second end of the first pin 30 extends into a first eccentric shaft hole 11 provided on the spindle 10 corresponding to the first pin 30, so that the second end of the first pin 30 moves with the spindle 10. The first pin 30 is connected to the brake shaft 40 and the spindle 10 in such a manner that the first pin 30 can directly sense the movement states of the spindle 10 and the brake shaft 40, so that the first pin 30 can directly participate in the force limiting process in response to the torsional deformation of the torsion bar 20 when the seatbelt retractor 01 is in the braking state.

Specifically, when the seatbelt retractor 01 is in the unbraked state, the spindle 10 and the brake shaft 40 are rotated synchronously by the connecting action of the torsion bar 20, the relative positional relationship between the first eccentric shaft hole 11 on the spindle 10 and the first end of the first pin 30 at the fixed position on the brake shaft 40 does not change, and the first pin 30 is rotated synchronously with the rotation of the spindle 10 and the brake shaft 40.

When the seatbelt retractor 01 is in a braking state, if the torsion bar 20 enters a force limiting process, the second end of the torsion bar 20 will twist and deform relative to the first end, and meanwhile, the mandrel 10 is driven to rotate relative to the braking shaft 40, and rotate relative to the braking shaft 40, at this time, the first eccentric shaft hole 11 on the mandrel 10 and the first end of the first pin 30 also move relative to the fixed position on the braking shaft 40, and the first eccentric shaft hole 11 generates a bending acting force on the side surface of the first pin 30, so that the first pin 30 generates plastic deformation. The plastic deformation of the first pin 30 releases the webbing's pressure against the body, thereby completing the force limiting process in cooperation with the torsion bar 20.

The specific fixing position of the first end of the first pin 30 may be set differently according to different requirements and conditions. The first end of the first pin 30 may be secured to the brake shaft 40 directly or to other components that move synchronously with the brake shaft 40, for example, without limitation.

It should be appreciated that there are many different embodiments of the specific structural arrangement and material selection of the first pin 30, for example, the first pin 30 may be made of a metal material such as stainless steel or stainless iron; in addition, the first pin 30 may be designed with different sizes (e.g., thicknesses) or types of cross-sectional structures, each type corresponding to a different deformation stress; thus, by selecting the model of the first pin 30, the retractor with different force limiting threshold parameters can be obtained, so that the requirements of different scenes and different passengers can be met; whatever the material, size, and configuration, it is desirable that the first pin 30 cooperate with the torsion bar 20 to limit the webbing's binding force to a suitable force limit.

In a specific embodiment, the first pin may be determined from candidate pins of different types according to the target force limiting threshold, and the candidate pins of different types correspond to different force limiting thresholds. Specifically, pins of different types are used as candidate pins for a user to select, so that when the user installs or replaces the first pin, the type of the pin to be installed can be freely selected according to the required force limiting threshold parameter, namely the target force limiting threshold, so that the first pin corresponds to the target force limiting threshold. Such an embodiment enables the user to freely change the force limiting threshold of the seatbelt retractor 01, enabling the seatbelt retractor 01 to meet different force limiting demands of the user, so as to improve the adaptability of the seatbelt retractor 01 to different force limiting demands.

In addition, the first end of the first pin 30 may be fixed in a plurality of ways, such as by screwing, clamping, riveting, etc., and is not limited thereto.

The above is the basic seat belt retractor 01 provided in this embodiment, the seat belt retractor 01 is provided with the first pin 30, and the first end of the first pin 30 is eccentrically fixed relative to the brake shaft 40, and the second end stretches into the first eccentric shaft hole 11 of the mandrel 10 corresponding to the first pin 30, so that the two ends of the first pin 30 rotate synchronously with the brake shaft 40 and the mandrel 10 respectively, and the first pin 30 can directly cooperate with the torsion bar 20 to release the webbing pressure without a linkage piece, thereby improving the reliability of the seat belt retractor 01.

In a specific embodiment, on the basis of the above-mentioned seatbelt retractor 01, more specific settings may be made, or other feasible structures may be added, so as to obtain more functions or performances, and meet the requirements of different application scenarios. The following is a further detailed description on the basis of the structure of the basic seatbelt retractor 01 shown in fig. 1 and 2 in order to fully understand the seatbelt retractor 01 provided by the present utility model.

Wherein the first end of the first pin 30 can be secured to other components in synchrony with the brake shaft 40. The specific combined parts can be arranged differently according to different requirements. One possible embodiment is shown in fig. 3, and fig. 3 is a schematic structural diagram of a connection manner of the first pin and the brake shaft, and in this embodiment, the seatbelt retractor 01 further includes a connecting sleeve 41; the connecting sleeve 41 is fixed on the brake shaft 40; the first end of the first pin 30 is fixed to the connecting sleeve 41 and is located at an eccentric position with respect to the central axis of the brake shaft 40, thereby achieving a fixed connection of the first end of the first pin 30 with the brake shaft 40.

The connecting sleeve 41 is a mounting structure specially configured for the first pin 30, so as to facilitate the mounting and dismounting of the first pin 30. There are many specific forms of connection, and specific setting can be performed according to different requirements and conditions. The connecting sleeve 41 may be provided as a connecting block fixed to the brake shaft 40, or as shown in fig. 3, the connecting sleeve 41 may be provided in a ring shape, and the ring-shaped connecting sleeve 41 may be non-rotatably fitted over the brake shaft 40.

In addition, when the spindle 10 rotates relative to the brake shaft 40, the first eccentric shaft hole 11 rotates correspondingly with the spindle 10, so that during the force limiting process, the portion of the first pin 30 extending into the first eccentric shaft hole 11 is continuously pulled away from the first eccentric shaft hole 11 along with the rotation of the spindle 10, and the pulled-away portions are all deformed portions which have undergone plastic deformation. Therefore, the deformed portion of the first pin 30 drawn out from the first eccentric shaft hole 11 can be restricted by the structure such as the guide groove or the blocking piece, so that the deformed portion of the first pin 30 is prevented from interfering with the normal operation of other parts of the seatbelt retractor 01.

The guide slot 411 may be disposed on a component fixedly connected to the first end of the first pin 30, as shown in fig. 3, or may be disposed on another component. The guide slot 411 is not particularly limited as long as it can accurately receive the deformed portion of the first pin 30.

In this embodiment, taking an embodiment in which the first end of the first pin 30 is fixedly connected to the connecting sleeve 41 as an example, a specific arrangement manner of the guide slot 411 is provided, which is as follows: the connecting sleeve 41 is provided with a guide slot 411; the guide slot 411 is shaped such that when the first pin 30 is plastically deformed by the first eccentric shaft hole 11 with the rotation of the spindle 10, the deformed portion of the first pin 30 is withdrawn from the first eccentric shaft hole 11 with the rotation of the spindle 10 and just received in the guide slot 411.

The specific position and shape of the guide slot 411 corresponds to the plastic deformation process of the first pin 30. When the first pin 30 participates in the force limiting process, the guide slot 411 can be matched with the rotation of the mandrel 10, and the deformed part of the first pin 30 is accurately stored corresponding to the process of extracting the deformed part of the first pin 30 from the first eccentric shaft hole 11.

In one embodiment, the guide slot 411 may be configured to pass through the fixed position of the first pin 30 on the connecting sleeve 41, so that the deformed portion of the first pin 30 must fall into the guide slot 411. Alternatively, the first pin 30 may be provided at a predetermined distance from the fixed position of the connecting sleeve 41, which is not limited.

Further, to secure the storage effect of the guide slot 411, as shown in fig. 3, the extending track of the guide slot 411 may be set to an arc track conforming to the rotation track of the spindle 10, and the circle of the arc of the guide slot 411 coincides with the center axis of the brake shaft 40. Alternatively, the guide slot 411 may be configured as an end-to-end annular guide slot 412 (not shown), and the center of the annular guide slot 412 coincides with the central axis of the brake shaft 40. Of course, the guide slot 411 may be provided in other shapes, and is not limited thereto.

In addition, when the first end of the first pin 30 is fixedly connected with respect to the brake shaft 40, the connection mode of the first pin 30 may preferably adopt a clamping mode which is convenient to disassemble, so that only the first pin 30 may be replaced after plastic deformation of the first pin 30 occurs, and thereby the consumable for replacing parts is saved.

Taking an embodiment in which the first pin 30 is fixedly connected to the connecting sleeve 41 as an example, the specific fastening connection may be: the first end of the first pin 30 is provided with a snap-in structure 50 (not shown in the figures); the connecting sleeve 41 is provided with a clamping structure 60 (not shown) corresponding to the clamping structure 50; when the clamping structure 50 and the clamping structure 60 are clamped with each other, the first pin 30 and the connecting sleeve 41 form fixed connection; when the mutual engagement of the engaging structure 50 and the engaging structure 60 is released, the first pin 30 and the connecting sleeve 41 can be separated from each other.

It should be understood that the interengagement of the snap structure 50 and the snap structure 60 is merely one way of describing the releasable securing connection and is not limiting of the particular structure. In some possible embodiments, the clamping structure 50 and the clamping structure 60 are clamped with each other, the clamping structure 60 may be inserted into the inserting block of the clamping structure 50 to form the mutual clamping, or the clamping structure 50 may be configured as a threaded rod, and the clamping structure 60 may be configured as a threaded hole, so that the removable fixed connection is realized in a threaded connection manner.

In addition, the mounting pose of the first pin 30 determines the extent to which the first pin 30 is plastically deformed, and thus how much energy the first pin 30 can release. In practice, the degree of plastic deformation of the first pin 30 when engaged in the force limiting process may be adjusted by controlling the inclination of the first pin 30 at the time of initial installation. The initial installation is the state of the seatbelt retractor 01 when the torsion bar 20 and the first pin 30 are not deformed.

Wherein the central axis of the first pin 30 may be maintained at a predetermined angle from the central axis of the torsion beam 20 at the time of initial installation. Alternatively, the center axis of the first pin 30 and the center axis of the torsion bar 20 may be parallel to each other at the time of initial installation.

In addition, the force limiting threshold of the seatbelt retractor 01 may be changed by adding pins or changing the specification size of the first pin 30, so that the seatbelt retractor 01 can be adapted to different demands.

The manner of increasing the force limiting threshold of the seatbelt retractor 01 by adding a pin may specifically be: the seatbelt retractor 01 further includes a second pin 70 (not shown in the drawings); the first end of the second pin 70 is offset from the central axis of the brake shaft 40 to form a fixed connection with the brake shaft 40, and the second end extends into a second eccentric shaft hole 80 (not shown) of a corresponding second pin 70 provided on the spindle 10; when the seatbelt retractor 01 is in a braking state, the second pin 70 can be plastically deformed in synchronization with the first pin 30 by the second eccentric shaft hole 80 along with the rotation of the spindle 10 when the spindle 10 is rotated due to the deformation of the torsion bar 20.

The connection manner, shape and structure of the second pin 70 may be specifically referred to the related description of the first pin 30, and redundant description is omitted herein. The second pin 70 may be identical to the first pin 30, or may be different from the first pin 30, such as different size specifications, different connection modes, etc., and is not limited thereto.

It should be clear that the above description is only focused on the concept of the present utility model, and in practical implementation, the seatbelt retractor 01 may further include other structural components such as a frame, a belt sensing assembly, a vehicle sensing assembly, a cover, a pretensioner, etc., may also include different sensors, electric control elements, etc., or other structures in the prior art, and will not be described in detail herein

In the first embodiment, only the first end of the first pin 30 is fixedly connected to the brake shaft 40, and the second end of the first pin 30 extends into the first eccentric shaft hole 11 of the corresponding first pin 30 provided on the spindle 10, and in the seatbelt retractor 01, the first end of the first pin 30 may be fixedly connected to the spindle 10, and the second end of the second pin extends into the first eccentric shaft hole 11 of the corresponding first pin 30 provided on the brake shaft 40. The following second embodiment describes the seatbelt retractor 01 of this structural form in detail, specifically as follows:

the seatbelt retractor includes: the device comprises a mandrel, a torsion bar, a first pin and a brake shaft; the first end of the torsion bar is coaxially and fixedly connected with the brake shaft, and the second end of the torsion bar is coaxially and fixedly connected with the mandrel, so that the brake shaft is connected with the mandrel through the torsion bar; wherein the brake shaft is locked when the seatbelt retractor is in a braked state;

the first end of the first pin deviates from the central axis of the mandrel to form fixed connection with the mandrel, and the second end stretches into a first eccentric shaft hole of the corresponding first pin arranged on the brake shaft;

when the seat belt retractor is in a braking state, the first pin can rotate along with the mandrel when the mandrel rotates due to deformation of the torsion bar, and plastic deformation occurs under the action of the first eccentric shaft hole.

It should be clear that the connection manner between the first pin and the brake shaft and the spindle is merely opposite to the connection manner of the first pin in the first embodiment, and the specific structure corresponds to various embodiments listed in the first embodiment, and detailed description will not be repeated herein with reference to the above embodiments.

In addition, the following embodiments also provide a seat belt including any one of the above two seat belt retractors, corresponding to the above two structural forms of seat belt retractors, concretely as follows:

the seatbelt retractor of a seatbelt includes: the device comprises a mandrel, a torsion bar, a first pin and a brake shaft; the first end of the torsion bar is coaxially and fixedly connected with the brake shaft, and the second end of the torsion bar is coaxially and fixedly connected with the mandrel, so that the brake shaft is connected with the mandrel through the torsion bar; wherein the brake shaft is locked when the seatbelt retractor is in a braked state;

the first end of the first pin deviates from the central axis of the brake shaft to form fixed connection with the brake shaft, and the second end stretches into a first eccentric shaft hole corresponding to the first pin and arranged on the mandrel; or the first end of the first pin deviates from the central axis of the mandrel to form fixed connection with the mandrel, and the second end stretches into a first eccentric shaft hole of the corresponding first pin arranged on the brake shaft;

when the seat belt retractor is in a braking state, the first pin can be plastically deformed under the action of the first eccentric shaft hole along with the rotation of the spindle when the spindle rotates due to the deformation of the torsion bar.

The specific structure of the seatbelt retractor of the seatbelt corresponds to the various specific implementations of the seatbelt retractor of the first and second embodiments, and reference is made specifically to the descriptions related to the first and second embodiments, and redundant descriptions thereof are omitted here

While the utility model has been described in terms of preferred embodiments, it is not intended to be limiting, but rather, it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (10)

1. A seatbelt retractor, characterized in that the seatbelt retractor comprises: the device comprises a mandrel, a torsion bar, a first pin and a brake shaft; the first end of the torsion bar is coaxially and fixedly connected with the brake shaft, and the second end of the torsion bar is coaxially and fixedly connected with the mandrel, so that the brake shaft is connected with the mandrel through the torsion bar; wherein the brake shaft is locked when the seatbelt retractor is in a braked state;

the first end of the first pin deviates from the central axis of the brake shaft to form fixed connection with the brake shaft, and the second end stretches into a first eccentric shaft hole corresponding to the first pin and arranged on the mandrel;

when the seatbelt retractor is in a braking state, the first pin can be plastically deformed by the first eccentric shaft hole with rotation of the spindle when the spindle is rotated due to deformation of the torsion bar.

2. The seatbelt retractor according to claim 1, wherein the seatbelt retractor further comprises a connecting sleeve; the connecting sleeve is fixed on the brake shaft; the first end of the first pin is fixed on the connecting sleeve and is positioned at an eccentric position relative to the central axis of the brake shaft, so that the first end of the first pin is fixedly connected with the brake shaft.

3. The seatbelt retractor according to claim 2, wherein the connecting sleeve is provided in a circular ring shape; the annular connecting sleeve is non-rotatably sleeved on the brake shaft.

4. The seatbelt retractor according to claim 2, wherein a guide groove is provided on the connecting sleeve;

the shape of the guide groove is set in such a way that when the first pin rotates along with the mandrel and is subjected to plastic deformation under the action of the first eccentric shaft hole, the deformation part of the first pin is pulled away from the first eccentric shaft hole along with the rotation of the mandrel and is just contained in the guide groove.

5. The seatbelt retractor according to claim 4, wherein the guide groove is a circular guide groove connected end to end; the center of the circular ring guide groove coincides with the central axis of the brake shaft.

6. The seatbelt retractor according to claim 2, wherein a first end of the first pin is provided with a snap-in structure; the connecting sleeve is provided with a clamping structure corresponding to the clamping structure; when the clamping structure and the clamping structure are mutually clamped, the first pin and the connecting sleeve form fixed connection; when the mutual clamping of the clamping structure and the clamping structure is released, the first pin can be separated from the connecting sleeve.

7. The seatbelt retractor according to claim 1, wherein the first pin is determined from candidate pins of different models according to a target force limiting threshold; different models of the candidate pin correspond to different force limiting thresholds.

8. The seatbelt retractor according to claim 1, further comprising a second pin; the first end of the second pin deviates from the central axis of the brake shaft to form fixed connection with the brake shaft, and the second end stretches into a second eccentric shaft hole corresponding to the second pin and arranged on the mandrel;

when the seat belt retractor is in a braking state, the second pin can rotate along with the mandrel when the mandrel rotates due to deformation of the torsion bar, and the second pin and the first pin are subjected to plastic deformation synchronously under the action of the second eccentric shaft hole.

9. A seatbelt retractor, characterized in that the seatbelt retractor comprises: the device comprises a mandrel, a torsion bar, a first pin and a brake shaft; the first end of the torsion bar is coaxially and fixedly connected with the brake shaft, and the second end of the torsion bar is coaxially and fixedly connected with the mandrel, so that the brake shaft is connected with the mandrel through the torsion bar; wherein the brake shaft is locked when the seatbelt retractor is in a braked state;

the first end of the first pin deviates from the central axis of the mandrel to form fixed connection with the mandrel, and the second end stretches into a first eccentric shaft hole corresponding to the first pin, which is arranged on the brake shaft;

when the seatbelt retractor is in a braking state, the first pin can be plastically deformed by the first eccentric shaft hole along with rotation of the spindle when the spindle rotates due to deformation of the torsion bar.

10. A seat belt, characterized in that a seat belt retractor of the seat belt comprises: the device comprises a mandrel, a torsion bar, a first pin and a brake shaft; the first end of the torsion bar is coaxially and fixedly connected with the brake shaft, and the second end of the torsion bar is coaxially and fixedly connected with the mandrel, so that the brake shaft is connected with the mandrel through the torsion bar; wherein the brake shaft is locked when the seatbelt retractor is in a braked state;

the first end of the first pin deviates from the central axis of the brake shaft to form fixed connection with the brake shaft, and the second end stretches into a first eccentric shaft hole corresponding to the first pin and arranged on the mandrel; or the first end of the first pin deviates from the central axis of the mandrel to form fixed connection with the mandrel, and the second end stretches into a first eccentric shaft hole corresponding to the first pin, which is arranged on the brake shaft;

when the seatbelt retractor is in a braking state, the first pin can be plastically deformed by the first eccentric shaft hole with rotation of the spindle when the spindle is rotated due to deformation of the torsion bar.