CN219927647U - Anti-back-locking safety belt retractor and safety belt - Google Patents

Abstract

The utility model provides a safety belt retractor capable of preventing back locking and a safety belt, wherein a ratchet wheel of the safety belt retractor is provided with a guide chute; the bearing column arranged on the locking block passes through the guide chute and can be positioned at a locking position or an unlocking position under the guide action of the guide chute; the first end of the elastic device is fixed on a fixed position arranged on the ratchet wheel, and the second end of the elastic device is directly or indirectly connected with the mandrel, so that the relative position relationship between the ratchet wheel and the mandrel is kept relatively stable under the elastic action of the elastic device when no vehicle-sensing locking and belt-sensing locking occur. The elastic device in the safety belt retractor can provide the elastic force from the ratchet wheel for the locking block, so that the relative position relationship between the ratchet wheel and the mandrel is kept relatively stable when the locking is not caused by the driving sense and the locking is caused by the belt sense, the locking block and the ratchet wheel are prevented from being locked under the action of acceleration inertia of the webbing rollback, and the normal use of the webbing is ensured.

Description

Anti-back-locking safety belt retractor and safety belt

Technical Field

The utility model relates to the technical field of safety belts, in particular to a safety belt retractor capable of preventing back locking and a safety belt.

Background

The safety belt is used as an indispensable basic safety facility on the automobile, and an emergency locking function is usually arranged in the safety belt retractor for protecting the personal safety of passengers. Specifically, when a car accident occurs, the car seat belt retractor performs emergency locking, and the webbing is not released any more, so that the occupant is restrained on the seat by the webbing.

One existing seat belt retractor is locked to the retractor frame by a lock block. Specifically, when the automobile has safety accidents such as sudden stop and rollover, passengers have a tendency of separating from the seat, at the moment, the automobile sensing assembly or the belt sensing assembly can be triggered, so that automobile sensing locking or belt sensing locking occurs, the ratchet wheel is locked, the locking block rotating along with the mandrel is guided to a locking position by the ratchet wheel, and is locked with the frame, so that the locking mandrel can not pull out the webbing.

However, when the conventional seatbelt retractor is used, if the webbing is pulled out for a long length and then the webbing is recovered, a large impact force is generated when the webbing is rewound, so that the ratchet wheel is subjected to the action of acceleration inertia to generate relative rotation relative to the mandrel under the condition that no safety accident occurs, and the locking block is guided to a locking position to form locking with the frame, and the locking is called 'back locking'; the back lock may cause the seat belt to not be pulled out again. Therefore, how to avoid the webbing from being locked back under the condition of no safety accident becomes a key for ensuring the normal use of the safety belt.

Disclosure of Invention

The utility model provides a safety belt retractor capable of preventing back locking, which solves the problem that the safety belt retractor cannot be used normally due to back locking after webbing is quickly rewound in the prior art.

The embodiment of the utility model provides a safety belt retractor capable of preventing back locking, wherein a ratchet wheel of the safety belt retractor is provided with a guide chute; the bearing column arranged on the locking block passes through the guide chute and can be positioned at a locking position or an unlocking position under the guide action of the guide chute;

the first end of the elastic device is fixed on a fixed position arranged on the ratchet wheel, and the second end of the elastic device is directly or indirectly connected with the mandrel, so that the relative position relationship between the ratchet wheel and the mandrel is kept relatively stable under the elastic action of the elastic device when no vehicle-sensing locking and belt-sensing locking occur.

Optionally, the indirect connection of the second end of the elastic device with the mandrel includes: the second end of the elastic device is connected to the bearing column of the locking block.

Optionally, the safety belt retractor further comprises an annular clamping spring; the first end of the annular clamp spring is connected to the mandrel, and the second end of the annular clamp spring is connected to the bearing column;

when the locking block is at the unlocking position, the annular clamp spring is matched with the elastic device to store the locking block at the stopping position; when the locking block is located at the stopping position, the bearing column is located at the first end of the guide chute.

Optionally, the guiding chute is arranged on the ratchet bottom plate; the annular clamp spring and the elastic device are positioned at two sides of the ratchet wheel bottom plate.

Optionally, the elastic device is a tension spring; the elasticity of the elastic device is the tension of the tension spring.

Optionally, the elastic device is a pressure spring; the elasticity of the elastic device is the tension of the pressure spring.

Optionally, the force-bearing column is provided with a lead step; the lead step prevents the locking block body from generating friction with the ratchet wheel.

The embodiment of the utility model also provides a safety belt, which comprises the safety belt retractor.

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

the embodiment of the utility model provides a safety belt retractor capable of preventing back locking, wherein a ratchet wheel of the safety belt retractor is provided with a guide chute; the bearing column arranged on the locking block passes through the guide chute and can be positioned at a locking position or an unlocking position under the guide action of the guide chute; the first end of the elastic device is fixed on a fixed position arranged on the ratchet wheel, and the second end of the elastic device is directly or indirectly connected with the mandrel, so that the relative position relationship between the ratchet wheel and the mandrel is kept relatively stable under the elastic action of the elastic device when no vehicle-sensing locking and belt-sensing locking occur.

The safety belt retractor is characterized in that the ratchet wheel is connected with the mandrel through the elastic device, and the elastic device can always provide elastic force from the mandrel for the ratchet wheel. When the meshbelt is rolled back fast, the ratchet can not take place relative rotation for the dabber under acceleration inertia's effect, and the ratchet just can not lead the locking piece to the locking position and take place the locking with the frame to avoided the emergence of back locking, and then guaranteed still can normally use after the meshbelt is rolled back fast, improved passenger's use experience.

Drawings

Fig. 1 is a first schematic structural view of a safety belt retractor for preventing locking according to an embodiment of the present utility model;

fig. 2 is a second schematic structural view of a safety belt retractor for preventing locking according to an embodiment of the present utility model;

fig. 3 is a schematic structural view of a seat belt retractor when a lock block provided in an embodiment of the present utility model is fully received;

FIG. 4 is a schematic view of a seat belt retractor when a lock block is locked to a retractor frame according to an embodiment of the present utility model;

reference numerals:

10: a seatbelt retractor;

101: a retractor frame; 1011: frame tooth form;

102: a coil spring;

103: a mandrel; 1031: a limiting block; 1032: a storage chamber; 1033: an annular clamp spring;

104: a locking block; 1041: a lock block body; 1042: a force bearing column; 1043: locking teeth;

105: a ratchet wheel; 1051: a guide chute; 1052: a ratchet bottom plate; 1053: a first limit post; 1054: the second limit column; 1055: braking teeth;

106: an inertial mass assembly; 1061: an inertial mass; 1062: an inertial block mounting sleeve; 1063: a buffer spring;

107: a vehicle sensing device; 1071: an induction member; 1072: a holding arm;

108: an elastic device; 109: a cover cap;

20: woven belt.

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 existing safety belt retractor has the function of emergency locking in order to ensure that the webbing can have a protection function. Specifically, be provided with in the safety belt retractor and feel subassembly and area and feel the subassembly, when the incident such as taking place the vehicle scram, turn on one's side, the human body pulls out the meshbelt and makes dabber rotate fast, the subassembly is felt or area and is felt the emergence of accident and trigger and lock the ratchet to the subassembly, at this moment, along with dabber pivoted locking piece receives the direction effect of ratchet to by the chamber of accomodating of being released under the direction effect and arrive the locking position, take place the locking with the frame of safety belt retractor, and then the rotation of restriction dabber makes the meshbelt can't be pulled out any more, makes the meshbelt restrict the passenger on the seat.

However, in the prior art, when the webbing is quickly recovered, the ratchet wheel also rotates relatively to the mandrel under the action of acceleration inertia, and the ratchet wheel plays a guiding role on the locking block. This results in that the locking block is easily locked with the frame again under the guiding action of the ratchet wheel to form a back lock when the webbing is wound back, so that the webbing cannot be pulled out again.

In order to solve the above-mentioned problem, this embodiment provides a safety belt retractor of preventing back locking, and this safety belt retractor passes through elastic device and restricts the ratchet, makes the ratchet receive the elasticity from the dabber, makes ratchet and dabber can keep positional relationship's relatively stable when the meshbelt is rewound to guarantee that the meshbelt is fast when rewinding, the ratchet can not lead the locking piece to the locking position and take place the back locking, and then guarantees the normal use of safety belt.

The anti-lock seatbelt retractor provided by the present utility model will be described below with reference to the accompanying drawings, and it should be understood by those skilled in the art that the following implementations are illustrative only and not an exhaustive list, and that those skilled in the art may substitute, splice or combine certain features or certain examples based on these implementations, and still be considered as the disclosure of the present utility model.

The anti-lock seatbelt retractor may be as shown in fig. 1-4. Fig. 1 is a schematic diagram of a first structure of a safety belt retractor for preventing locking. As shown in fig. 1, the seatbelt retractor 10 may include a retractor frame 101, a coil spring 102 (not shown), a spindle 103, a lock block 104, a ratchet 105, an inertia block assembly 106, a feel device 107, a spring device 108, and a cover 109.

Wherein retractor frame 101 is used to mount the various components of the seatbelt retractor as a frame foundation for mounting coil spring 102, spindle 103, lock block 104, ratchet 105, inertial block assembly 106, feel device 107 and spring device 108. The retractor frame 101 may be made of different rigid materials according to actual requirements, and may be configured in different specific shapes, which is not limited herein. The retractor frame 101 may be a single integral component, or may be formed by combining a plurality of components by welding, fastening, or the like, and is not limited thereto.

In a possible embodiment as shown in fig. 1, the spindle 103 is rotatably mounted in the retractor frame 101 and fixedly connected to one end of the webbing 20 (not shown in the drawings) so that the webbing 20 can be wound around and accommodated in the spindle 103. Meanwhile, the coil spring 102 is mounted on the coil spring side of the retractor frame 101, and provides the spindle 103 with a driving force for recovering the webbing 20, so that the webbing 20 is always in a recovery tendency. Also, the driving force of the coil spring 102 is much smaller than the occupant's pulling force, which overcomes the driving force of the coil spring 102 when the occupant pulls out the webbing 20, so that the spindle 103 rotates and releases the webbing 20.

A lock block 104, a ratchet 105, an inertial mass assembly 106, a feel device 107, an elastic device 108, and a cover 109 are mounted on the lock side of the retractor frame 101. Wherein the lock block 104 is in the receiving cavity 1032 that rotates at the same speed as the spindle 103. As shown in fig. 2, fig. 2 is a second schematic structural view of a safety belt retractor with anti-lock according to the present embodiment, wherein the receiving cavity 1032 may be formed by a limiting block 1031 fixedly connected with the mandrel 103. When the spindle 103 rotates, the restriction block 1031 rotates therewith, so that the receiving chamber 1032 also rotates at the same speed as the spindle. The lock block 104 is also driven to rotate by the restriction block 1031. In other possible embodiments, the locking block 104 may be driven by a structure such as a clip spring or a pull ring fixed to the spindle 103 to rotate at the same speed as the spindle 103, which is not particularly limited herein.

Wherein the locking block 104 and the retractor frame 101 may be locked by means of a toothed engagement. Specifically, the lock block 104 is provided with lock teeth 1043, and the retractor frame 101 is provided with frame teeth 1011 corresponding to the lock teeth, and when the lock teeth 1043 on the lock block 104 are engaged with the frame teeth 1011, locking is formed. When the lock is formed, the engagement of the lock teeth 1043 and the frame teeth 1011 captures the lock block 104 on the retractor frame 101, and the lock block 104 captures the spindle 103 such that the spindle 103 is no longer rotatable. The locking block body 1041 may abut against the edge of the receiving cavity 1032, i.e. abut against the limiting block 1031, so that the spindle 103 cannot rotate. Alternatively, the spindle 103 may be restricted from rotating relative to the locking block 104 by a structure such as a snap spring or a pull ring, so that the spindle 103 cannot rotate any more, which is not particularly limited herein.

The ratchet 105 is rotatably sleeved on the mandrel 103 at the locking side of the retractor frame 101, a guide chute 1051 is arranged on the ratchet 105, and a bearing column 1042 arranged on the locking block 104 passes through the guide chute 1051 and can be in a locking position or an unlocking position under the guiding action of the guide chute 1051; the first end of an elastic device 108 is fixed on the fixed position arranged on the ratchet 105, and the second end is directly or indirectly connected with the mandrel 103, so that the relative position relationship between the ratchet and the mandrel is kept relatively stable under the elastic action of the elastic device when no vehicle-sensing locking and no belt-sensing locking occur.

Wherein, the elasticity of the elastic device meets the following requirements: when the webbing 20 is retracted under the recovery force of the coil spring 102, the ratchet 105 is prevented from being locked due to the fact that the locking block 104 is guided to the locking position by the acceleration inertia generated by the rewinding of the coil spring 102 by the elastic force of the elastic means 108; when the vehicle feel lock or the belt feel lock occurs, the elastic force of the elastic device 108 does not cause the vehicle feel lock or the belt feel lock to be impossible.

The locked position refers to a position where the lock block 104 is locked with the retractor frame 101, and the unlocked position refers to a position where the lock block 104 is not locked with the retractor frame 101.

The elastic device 108 has a first end fixed to the ratchet 105 and a second end connected directly or indirectly to the spindle 103, so that the ratchet 105 receives an elastic force from the spindle 103, so that the ratchet 105 can still maintain relative stability in positional relation with respect to the spindle 103 when the webbing is rewound rapidly, and the locking block 104 is not guided to the locking position by the ratchet 105 to cause locking when the webbing is rewound, thereby avoiding back locking of the seatbelt retractor.

The second end of the elastic device 108 is directly connected to the mandrel 103, that is, the second end of the elastic device 108 is directly connected to the mandrel 103. The second end of the elastic device 108 is indirectly connected to the spindle 103, which means that the elastic device is connected to other components that interact with the spindle 103, for example, the second end of the elastic device 108 may be connected to the locking block 104, or specifically, the second end of the elastic device 108 may be connected to the bearing post 1042 of the locking block 104, which is not limited herein.

Wherein the spindle 103, the locking block 104, the ratchet 105 and the spring means 108 interact with each other. When the webbing 20 is normally pulled out, the spindle 103 rotates as the webbing is pulled, and the interaction between the spindle 103, the lock block 104, the ratchet 105 and the spring device 108 causes the lock block 104, the ratchet 105 and the spring device 108 to rotate synchronously with the spindle 103.

When the webbing 20 is normally pulled out, the lock block 104 rotates in synchronization with the spindle 103, the guide chute 1051 of the ratchet 105 rotates in synchronization with the spindle 103 even under the pushing of the rotating lock block 104, and the lock block 104 is pushed out of the storage cavity 1032 to form a lock with the retractor frame 101 tooth form without being guided by the ratchet 105, and at this time, the lock block 104 is at the unlocked position.

When a safety accident occurs, the human body drives the webbing to pull out to enable the mandrel 103 to rotate, the ratchet 105 is locked by sensing the vehicle-sensing locking or the belt-sensing locking triggered by the safety accident, the locking block 103 slides in the guide sliding groove 105 of the ratchet 105 in the rotating process along with the mandrel 103, and the shape of the guide sliding groove 105 enables the locking block 103 to extend out of the storage cavity 1032 to reach the locking position under the guide action, so that the locking with the retractor frame 101 occurs. The locked lock block 103 blocks the rotation of the spindle 103, so that the spindle 103 is also locked, and the webbing 20 cannot be pulled out.

When the webbing 20 is rewound quickly by the coil spring 102, the elastic means 108 always provides the ratchet 105 with elastic force from the spindle 103. Although the rapid rewinding of the webbing 20 will subject the ratchet 106 to the moment of inertia, the moment of inertia will be counteracted by the spring force provided by the spring means 108 such that no relative rotation of the ratchet 106 with respect to the spindle 103 occurs or such that the relative rotation is insufficient to cause the ratchet 106 to guide the lock block 104 to the locked position, thereby avoiding back locking.

In this embodiment, the elastic direction and the elastic force of the elastic device 108 are specifically set to ensure that the ratchet 105 does not guide the locking block 104 to the locking position under the action of the acceleration inertia generated by the rewinding of the coil spring 102 while ensuring that the locking is sensed by the vehicle or is sensed by the belt.

It should be clear that, when the lock block 104 is in the locked position and the unlocked position, the relative positions of the lock block 104 with respect to the ratchet 105 are different, and the relative positions of the bearing posts 1042 of the lock block 104 with respect to the guide chute 1051 are correspondingly different. As an example, the specific position of the lock block 104 may be shown in fig. 3 and 4, and fig. 3 and 4 are schematic structural views of the seatbelt retractor when the lock block is fully received and the lock block is locked with the retractor frame, respectively. When the lock block 104 is in the locked position, as shown in fig. 4, the bearing post 1042 is located at the second end of the guide chute 1051. With the lock block 104 in the unlocked state, the bearing post 1042 is biased toward the first end of the guide chute 1051, as shown in FIG. 3.

In another possible embodiment, a mechanism is also provided within the seatbelt retractor that positions the lock block 104 in a rest position, which refers to a position in which the lock block 104 is fully received by the receiving cavity 1032. The mechanism may further limit the position of the lock block 104 to further ensure that the lock block 104 is in a rest position where no lock is generated or to re-pull the lock block 104 back to the rest position after a lock has occurred.

The mechanism for positioning the locking block 104 in the parking position may be, but is not limited to, an annular clamp spring, a spring, etc. The magnitude and direction of the pulling force provided by the mechanism also does not cause the locking of the vehicle sense or the locking of the belt sense to be impossible, and the specific implementation mode is not limited.

Illustratively, in the embodiment shown in fig. 2, the seatbelt retractor 10 also includes an annular snap spring 1033; the first end of the annular clamp spring 1033 is connected to the mandrel 103, and the second end is connected to the bearing column 1042; when the locking block 104 is in the unlocked position, the annular clamp spring 1033 cooperates with the elastic device 108 to store the locking block 104 in the parking position; when the lock block 104 is in the rest position, the bearing post 1042 is located at a first end of the guide chute 1051.

Wherein the annular clamp spring 1033 is used to enable the lock block 104 to remain in the parked position when the webbing 20 is not being pulled out quickly. It will be appreciated that in some possible embodiments, the annular clamp spring 1033 may be replaced by other parts, such as by other forms of springs, without limitation.

In this embodiment, the bearing post 1042 is located at a first end of the guide chute 1051 when the lock block 104 is in the rest position. It should be appreciated that the first and second ends of the guide chute 1051 are opposite, and in some possible embodiments, the bearing post 1042 is not necessarily located at the end of the second end of the guide chute 1051 or at the end of the first end when the lock block 104 is in the locked or parked position.

In addition, the belt sensing locking is the locking which occurs when the belt sensing component senses the rapid pulling-out of the braid, and the belt sensing component has a plurality of specific structural forms. One possible way is shown in fig. 1 and 3, wherein the tape feel assembly is formed by the retractor frame 101, the ratchet 105, the inertial mass assembly 106 and the cover 109 together.

When a safety accident occurs, a human body pulls the webbing 20 to be pulled out quickly under the inertia action to drive the mandrel 103 and the ratchet 105 to rotate quickly, when the acceleration is overlarge, the inertia block assembly 106 rotates relatively relative to the ratchet 105, the inertia block 1061 of the inertia block assembly 106 abuts against the cover 109 and limits the rotation of the ratchet 105, so that the ratchet 105 is locked, and the ratchet 105 guides the locking block 104 to the locking position to form locking with the retractor frame 101, so that the locking with the feel of the webbing is realized. In other embodiments, a buffer spring 1063 (not shown) may be disposed between the inertial mass 1061 and the ratchet 105, where the inertial mass assembly 106 rotates relative to the ratchet 105, and the inertial mass 1061 of the inertial mass assembly 106 abuts the cover 109 against the buffer spring force of the buffer spring 1063.

In order to ensure the normal triggering of the locking with sense, the specific structure of the inertia block assembly 106 arranged in the ratchet 105 can be arranged in different forms according to the requirements. By way of example, an inertial mass assembly 106 having a mass substantially greater than the mass of the lock block 104 may be provided, as illustrated in fig. 3, with an inertial mass mounting sleeve 1062 in the inertial mass assembly 106 rotatably surrounding the inertial mass 1061 about the spindle 103 and limited in space by first and second stop posts 1053 and 1054 on the ratchet 105. Other configurations are possible and are not limited herein.

In addition, the vehicle sensing locking is the locking which occurs after the vehicle sensing component senses that the vehicle is inclined, and the vehicle sensing component also has various specific structural forms. One of them is shown in fig. 4, in which the vehicle-sensing assembly is specifically constituted by a retractor frame 101, a ratchet 105, and a vehicle-sensing device 107 together.

When a safety accident occurs, the sensing part 1071 of the vehicle sensing device 107 senses the deviation condition of the vehicle body, after the vehicle body deviates by a preset angle, the vehicle sensing device 107 triggers the supporting arm 1072 to support the braking teeth 1055 on the periphery of the ratchet 105, so that the ratchet 105 is locked, and the ratchet 105 guides the locking block 104 to the locking position to form locking with the retractor frame 101, thereby realizing vehicle sensing locking.

In addition, there are many different embodiments of the spring 108. For example, the elastic device 108 may be a tension spring as shown in fig. 1, where the elastic force of the elastic device 108 is the tension of the tension spring. Alternatively, the elastic device 108 may be configured as a compression spring, where the elastic force of the elastic device 108 is the tension of the compression spring. Alternatively, the spring device 108 may be provided as a combination of multiple parts, such as a structure similar to the coil spring 102, where tension is provided by the coil spring 102 and transmitted through a rigid pull ring to form the spring device 108. There are many specific implementations of the spring device 108, and no limitation is made herein.

In addition, the connection manner of the second end of the elastic means 108 with respect to the spindle 103 corresponds to the specific form of the elastic means 108 and the specific connection position of the elastic means 108. The connection may be fixed connection or may be a connection with a degree of freedom, such as a connection that is rotatable by hinging, which is not limited herein. Meanwhile, in order to ensure that the connection between the elastic device 108 and the bearing post 1042 is not separated, when a connection mode with freedom degree such as hinging is adopted, the connection mode can be limited by a hook, a clamping groove, a limiting plate and the like.

For example, when the second end of the spring device 108 is connected to the bearing post 1042 of the lock block 104, one possible specific connection is: the second end of the tension spring is a circular ring; the bearing column 1042 is provided with a groove, and the ring is sleeved in the groove on the bearing column 1042.

In addition, in order to ensure that friction force caused by interference of parts is not received in the force transmission process, the sliding of the guide chute 1051 of the locking block 104 on the ratchet 105 is further influenced, and the situation can be avoided through the arrangement of a space structure, so that the reaction speed and the reliability of locking are improved.

For the retractor with the elastic device 108 and the annular clamp spring 1033, the elastic device 108 and the annular clamp spring 1033 can be arranged in a layered mode, and interference of the elastic device 108 and the annular clamp spring 1033 in long-term use is avoided. One possible embodiment is to divide the ratchet 105, specifically, the guiding chute 1051 is disposed on the ratchet bottom plate 1052, and the annular clamp spring 1033 and the elastic device 108 are located on two sides of the ratchet bottom plate 1052. In addition, a special isolation structure may be provided, which is not limited herein.

In addition, considering that the lock block 104 slides in the guide chute 1051, if the lock block body 1041 is in direct contact with the ratchet 105, a large friction force is generated and damages the components, and the lock block body 1041 and the ratchet 105 may be separated by a step structure. One possible implementation is that the bearing post 1042 is provided with a lead step; the lead step prevents the lock block body 1041 from rubbing against the ratchet 105. Thus, when the lock block 104 slides in the guide chute 1051, the lead step directly contacts the ratchet 105, and no large friction force is generated. Alternatively, a step corresponding to the profile of the guide chute 1051 may be provided on the ratchet 105, and the specific embodiment is not limited herein.

The above embodiments describe in detail a back-locking-preventing seatbelt retractor, and the following embodiments provide a seatbelt including any of the seatbelt retractors possible in the above embodiments. The method comprises the following steps:

the safety belt at least comprises a safety belt retractor for preventing back locking, a webbing, a lock tongue component and a lock catch component.

Wherein, a ratchet wheel of the safety belt retractor is provided with a guide chute; the bearing column arranged on the locking block passes through the guide chute and can be positioned at a locking position or an unlocking position under the guide action of the guide chute;

the first end of the elastic device is fixed on a fixed position arranged on the ratchet wheel, and the second end of the elastic device is directly or indirectly connected with the mandrel, so that the relative position relationship between the ratchet wheel and the mandrel is kept relatively stable under the elastic action of the elastic device when no vehicle-sensing locking and belt-sensing locking occur.

In a possible embodiment, the indirect connection of the second end of the elastic means with the spindle comprises: the second end of the elastic device is connected to the bearing column of the locking block.

In a possible embodiment, the seatbelt retractor further comprises an annular snap spring; the first end of the annular clamp spring is connected to the mandrel, and the second end of the annular clamp spring is connected to the bearing column;

when the locking block is at the unlocking position, the annular clamp spring is matched with the elastic device to store the locking block at the stopping position; when the locking block is located at the stopping position, the bearing column is located at the first end of the guide chute.

In one possible embodiment, the guide chute is arranged on the ratchet base plate; the annular clamp spring and the elastic device are positioned at two sides of the ratchet wheel bottom plate.

In a possible embodiment, the elastic means is a tension spring; the elasticity of the elastic device is the tension of the tension spring.

In one possible embodiment, the spring means is a compression spring; the elasticity of the elastic device is the tension of the pressure spring.

In one possible embodiment, the force-bearing column is provided with a lead step; the lead step prevents the locking block body from generating friction with the ratchet wheel.

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 (8)

1. The anti-back locking safety belt retractor is characterized in that a ratchet wheel of the safety belt retractor is provided with a guide chute; the bearing column arranged on the locking block passes through the guide chute and can be positioned at a locking position or an unlocking position under the guide action of the guide chute;

the first end of the elastic device is fixed on the fixed position arranged on the ratchet wheel, and the second end of the elastic device is directly or indirectly connected with the mandrel, so that the relative position relationship between the ratchet wheel and the mandrel is kept relatively stable under the elastic action of the elastic device when no vehicle-sensing locking and belt-sensing locking occur.

2. The seatbelt retractor according to claim 1, wherein the indirect connection of the second end of the spring device with the spindle comprises:

the second end of the elastic device is connected to the bearing column of the locking block.

3. The seatbelt retractor according to claim 1, wherein the seatbelt retractor further comprises an annular clip spring; the first end of the annular clamp spring is connected to the mandrel, and the second end of the annular clamp spring is connected to the bearing column;

when the locking block is in an unlocking position, the annular clamp spring is matched with the elastic device to store the locking block in a stopping position; when the locking block is located at the parking position, the bearing column is located at the first end of the guide chute.

4. A seatbelt retractor according to claim 3, wherein said guide chute is provided on a ratchet base plate; the annular clamp spring and the elastic device are positioned on two sides of the ratchet wheel bottom plate.

5. The seatbelt retractor according to claim 1, wherein the elastic means is a tension spring; the elasticity of the elastic device is the tension of the tension spring.

6. The seatbelt retractor according to claim 1, wherein the elastic means is a compression spring; the elasticity of the elastic device is the tension of the pressure spring.

7. The seatbelt retractor according to claim 1, wherein a lead step is provided on the force-bearing post; the lead step prevents the locking block body from generating friction with the ratchet wheel.

8. A seat belt comprising a seat belt retractor according to any one of claims 1 to 7.