Safety belt retractor, safety belt device, seat and vehicle

Abstract

The utility model discloses a safety belt retractor, a safety belt device, a seat and a vehicle. The safety belt retractor comprises a shell, a locking wheel, a mechanical locking assembly, a driving device, a transmission part and a retaining part, the driving device can drive the mechanical locking assembly to be separated from the locking wheel through the transmission part so as to unlock the locking wheel, and when the locking wheel is unlocked, the mechanical locking assembly is locked; the acting force applied by the retaining piece to the transmission piece is used for driving the transmission piece to keep the mechanical locking assembly in an unlocking state separated from the locking wheel. According to the safety belt retractor, the mechanical locking assembly is kept in the unlocking state that the mechanical locking assembly is separated from the locking wheel by the transmission part through the acting force applied to the transmission part by the retaining part, so that a tolerance gap between the transmission part and the mechanical locking assembly is eliminated; the locking wheel, the transmission part and the mechanical locking assembly cannot loosen or displace or generate abnormal sound due to gaps, so that high stability of the safety belt retractor is guaranteed, and durability and user experience are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a safety belt retractor, a safety belt device, a seat and a vehicle. BACKGROUND

[0002] In the related art, the driving device in the safety belt retractor can drive the mechanical locking assembly and the locking wheel to separate to unlock the locking wheel through the transmission member, but there is a manufacturing or installation error between the transmission member and the mechanical locking assembly, and the mechanical locking assembly cannot stably keep the unlocking state of the locking wheel, resulting in that the safety belt retractor is prone to false locking during operation, or the parts are prone to relative displacement, shaking and abnormal noise. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to at least solve one of the above technical problems in the prior art to some extent. To this end, the present application provides a safety belt retractor, which is beneficial to reduce the tolerance gap and improve the reliability and stability of the safety belt retractor.

[0004] The present application also provides a safety belt device having the above safety belt retractor.

[0005] The present application also provides a seat having the above safety belt device.

[0006] The present application also provides a vehicle having the above seat.

[0007] According to the safety belt retractor of the first aspect of the present application, the safety belt retractor comprises a housing, a locking wheel, a mechanical locking assembly, a driving device, a transmission member and a retaining member, the locking wheel is rotatably installed on the housing, the locking wheel is used to limit the winding of the safety belt, the mechanical locking assembly is arranged in the housing, the mechanical locking assembly is used to selectively lock or unlock the locking wheel, the transmission member is in transmission connection with the driving device, the driving device can drive the mechanical locking assembly and the locking wheel to separate to unlock the locking wheel through the transmission member, when the mechanical locking assembly and the locking wheel are separated to unlock the locking wheel, the retaining member applies a force to the transmission member to drive the transmission member to keep the mechanical locking assembly in the unlocked state of being separated from the locking wheel.

[0008] According to the seat belt retractor provided by the embodiment of the present application, the driving member keeps the mechanical locking assembly in the unlocked state separated from the locking wheel by the force applied by the retaining member, eliminates the tolerance gap between the driving member and the mechanical locking assembly, and makes the locking wheel, the driving member and the mechanical locking assembly keep a relatively stable positional relationship under the action of the retaining member, so that the displacement caused by the gap is avoided to cause false locking, and the loosening or abnormal sound is avoided, thereby ensuring that the seat belt retractor has high stability and reliability, and the durability and user experience are improved.

[0009] According to some embodiments of the present application, the mechanical locking assembly comprises a pawl movably arranged in the housing, and the pawl is used to selectively lock or unlock the locking wheel, and the force applied by the retaining member to the driving member is used to drive the driving member to keep the pawl in the position separated from the locking wheel when the pawl is separated from the locking wheel to unlock the locking wheel.

[0010] According to some embodiments of the present application, the driving member keeps the pawl in the position separated from the locking wheel by abutting against the pawl.

[0011] According to some embodiments of the present application, the mechanical locking assembly further comprises a vehicle sensing member movably arranged in the housing, so that the pawl can selectively lock or unlock the locking wheel; when the mechanical locking assembly is kept in the unlocked state, the pawl can limit the movement of the vehicle sensing member.

[0012] According to some embodiments of the present application, the driving device is further used to drive the driving member to separate from the pawl, so that the vehicle sensing member is movable.

[0013] According to some embodiments of the present application, the mechanical locking assembly further comprises a mounting seat mounted on the housing, the pawl is rotatably mounted on the mounting seat, and the vehicle sensing member is movably arranged in the mounting seat.

[0014] According to some embodiments of the present application, the driving member is adapted to rotate around a first pivot axis, the pawl is adapted to rotate around a second pivot axis, the force applied by the mounting seat to the vehicle sensing member is F1, the distance between F1 and the second pivot axis is L1, the elastic force applied by the retaining member to the driving member is F2, the distance between F2 and the first pivot axis is L2, and |F1|*L1≤|F2|*L2.

[0015] According to some embodiments of the present application, the driving device drives the mechanical locking assembly to separate from the locking wheel through the transmission member, the driving force is F3, the distance between F3 and the first pivot shaft is L3, and F1*L1+F2*L2=F3*L3 is satisfied.

[0016] According to some embodiments of the present application, the retaining member is connected to the housing, or the retaining member is connected to the mounting seat.

[0017] According to some embodiments of the present application, the retaining member is an elastic member, and the retaining member is elastically connected between the transmission member and the housing, or the retaining member is elastically connected between the transmission member and the mounting seat.

[0018] According to some embodiments of the present application, the mechanical locking assembly further comprises a mounting seat mounted on the housing, the pawl comprises a pawl body portion, a pawl limiting arm and a pawl portion, the pawl body portion is rotatably mounted on the mounting seat, the pawl limiting arm is connected to the pawl body portion, the transmission member is adapted to lock or separate from the pawl limiting arm, and the pawl portion is connected to the pawl body portion and used for locking or unlocking the locking wheel.

[0019] According to some embodiments of the present application, the transmission member comprises a transmission member body and a transmission member limiting arm, the transmission member body is rotatable, and the transmission member limiting arm is connected to the transmission member body and adapted to lock or separate from the pawl limiting arm.

[0020] According to some embodiments of the present application, the transmission member is rotatably arranged on the housing, or the transmission member is rotatably arranged on the mounting seat.

[0021] According to some embodiments of the present application, the driving device comprises a driving body and a driving spool, the driving spool is adapted to be telescopic relative to the driving body to drive the transmission member to rotate.

[0022] According to some embodiments of the present application, the seat belt retractor further comprises a position detection device for detecting position information of the driving spool relative to the driving body.

[0023] According to some embodiments of the present application, the transmission member is adapted to rotate around a first pivot shaft, the pawl is adapted to rotate around a second pivot shaft, and the first pivot shaft and the second pivot shaft are separated and arranged in parallel.

[0024] According to some embodiments of the present application, the housing is provided with a limiting structure, the transmission member is adapted to lock the pawl when rotating in a first direction, and the limiting structure is used to limit the limit position of the transmission member rotating in the first direction.

[0025] According to the safety belt device of the second aspect of the present application, the safety belt is adapted to be wound on the winding drum, and the locking wheel is fixed on the winding drum to limit the winding of the safety belt.

[0026] According to the safety belt device of the second aspect of the present application, the safety belt device is provided with a retaining member, which applies an acting force to the transmission member to keep the mechanical locking assembly in the unlocked state separated from the locking wheel, so as to eliminate the tolerance gap between the transmission member and the mechanical locking assembly, and the locking wheel, the transmission member and the mechanical locking assembly can keep a relatively stable positional relationship under the action of the retaining member, and will not be loose, displace or make abnormal sound due to the gap, so as to ensure that the stability of the safety belt retractor is relatively high, and the durability and user experience are improved.

[0027] According to the seat of the third aspect of the present application, the safety belt device is provided.

[0028] According to the seat of the third aspect of the present application, the safety belt device is provided with a retaining member, which applies an acting force to the transmission member to keep the mechanical locking assembly in the unlocked state separated from the locking wheel, so as to eliminate the tolerance gap between the transmission member and the mechanical locking assembly, and the locking wheel, the transmission member and the mechanical locking assembly can keep a relatively stable positional relationship under the action of the retaining member, and will not be loose, displace or make abnormal sound due to the gap, so as to ensure that the stability of the safety belt retractor is relatively high, and the durability and user experience are improved.

[0029] According to the vehicle of the fourth aspect of the present application, the seat is provided.

[0030] According to the vehicle of the fourth aspect of the present application, the safety belt device of the seat is provided with a retaining member, which applies an acting force to the transmission member to keep the mechanical locking assembly in the unlocked state separated from the locking wheel, so as to eliminate the tolerance gap between the transmission member and the mechanical locking assembly, and the locking wheel, the transmission member and the mechanical locking assembly can keep a relatively stable positional relationship under the action of the retaining member, and will not be loose, displace or make abnormal sound due to the gap, so as to ensure that the stability of the safety belt retractor is relatively high, and the durability and user experience are improved.

[0031] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a perspective view of a seat belt retractor according to an embodiment of the present application;

[0033] Figure 2 is a cross-sectional view of a seat belt retractor according to an embodiment of the present application when a lock wheel is not locked;

[0034] Figure 3 is a cross-sectional view of a seat belt retractor according to an embodiment of the present application when a lock wheel is not locked;

[0035] Figure 4 is a perspective view of a mounting according to an embodiment of the present application;

[0036] Figure 5 is a perspective view of a lever according to an embodiment of the present application;

[0037] Figure 6 is a perspective view of a mounting, a lever, and a vehicle sensing member according to an embodiment of the present application;

[0038] Figure 7 is a perspective view of a rocker according to an embodiment of the present application;

[0039] Figure 8 is a perspective view of a mounting, a lever, a rocker, and a vehicle sensing member according to an embodiment of the present application;

[0040] Figure 9 is a cross-sectional view of a seat belt retractor according to an embodiment of the present application when a vehicle sensing member and a lever are hidden;

[0041] Figure 10 is a cross-sectional view of a seat belt retractor according to an embodiment of the present application when a lock wheel is locked;

[0042] Figure 11 is a schematic view of a seat belt device according to an embodiment of the present application;

[0043] Figure 12 is a schematic view of a seat according to an embodiment of the present application;

[0044] Figure 13 is a schematic view of a vehicle according to an embodiment of the present application.

[0045] REFERENCE NUMERALS:

[0046] The vehicle 100, the seat body 30, the safety belt device 20, the safety belt retractor 10, the housing 1, the limiting structure 111, the mounting seat 12, the conical groove 121, the locking wheel 2, the transmission member 3, the transmission member body 31, the transmission member limiting arm 32, the pawl 4, the pawl body part 41, the arc-shaped groove 411, the pawl limiting arm 42, the pawl part 43, the retaining member 5, the vehicle sensing member 6, the driving device 7, the driving body 71, the driving valve core 72, the position detecting device 8, the first pivot shaft 91, the second pivot shaft 92. DETAILED DESCRIPTION

[0047] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0048] In the description of the present application, the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0049] The embodiments of the present application are described below in detail with reference to the accompanying drawings. Figures 1-13 The safety belt retractor 10 according to the embodiments of the present application, the safety belt device 20 having the same, the seat 30 having the safety belt device 20, and the vehicle 100 having the seat 30 are described in detail below.

[0050] Referring to Figures 1-3 As shown, the safety belt retractor 10 according to the embodiments of the present application includes the housing 1, the locking wheel 2, the mechanical locking assembly, the driving device 7, the transmission member 3, and the retaining member 5, the locking wheel 2 is rotatably mounted to the housing 1, the locking wheel 2 is used to limit the winding of the safety belt, the mechanical locking assembly is arranged in the housing 1, the mechanical locking assembly is used to selectively lock or unlock the locking wheel 2, the transmission member 3 is in transmission connection with the driving device 7, the driving device 7 can drive the mechanical locking assembly and the locking wheel 2 to separate to unlock the locking wheel 2 through the transmission member 3, when the mechanical locking assembly and the locking wheel 2 are separated to unlock the locking wheel 2, the force applied by the retaining member 5 to the transmission member 3 is used to drive the transmission member 3 to keep the mechanical locking assembly in the unlocked state of being separated from the locking wheel 2.

[0051] Optionally, the locking wheel 2 can be a ratchet wheel, a cam structure. For example Figure 2 As shown, the locking wheel 2 is a ratchet wheel.

[0052] In the related art, the driving device in the seat belt retractor can drive the mechanical locking assembly and the locking wheel to separate to unlock the locking wheel, but there are manufacturing or installation errors between the transmission member and the mechanical locking assembly, and the mechanical locking assembly cannot stably maintain the unlocking state of the locking wheel, which causes the parts of the seat belt retractor to easily produce relative displacement, shaking and abnormal sound during the working process, thereby causing the stability of the seat belt retractor to be low, the durability to be low, and the user experience to be poor.

[0053] In the present application, specifically, the mechanical locking assembly can selectively lock or unlock the locking wheel 2, in the event of an emergency, the mechanical locking assembly timely locks the locking wheel 2, fixes the driver and passenger on the seat, effectively avoids the driver and passenger from being injured due to inertia, and provides safety protection for the driver and passenger. When it is judged that there is no danger, the driving device 7 can drive the mechanical locking assembly and the locking wheel 2 to separate through the transmission member 3, at this time, the mechanical locking assembly unlocks the locking wheel 2, and the holding member 5 applies force to the transmission member 3, and drives the transmission member 3 to keep the mechanical locking assembly in the unlocked state of being separated from the locking wheel 2, effectively avoids the situation that the locking wheel 2 is mistakenly locked in the normal driving state due to the malfunction of the mechanical locking assembly, improves the convenience and comfort of the use of the seat belt retractor 10, and at the same time, since there is a tolerance gap between the transmission member 3 and the mechanical locking assembly, it cannot completely reach a perfect fit state, the design redundancy is increased through the holding member 5, the tolerance gap between the transmission member 3 and the mechanical locking assembly is eliminated, the mechanical locking assembly can keep a relatively stable unlocking state under the action of the holding member 5, the gap between the transmission member 3 and the mechanical locking assembly is eliminated, and the loosening, displacement or abnormal sound caused by the gap between the transmission member 3 and the mechanical locking assembly will not occur, thereby ensuring the stability of the seat belt retractor 10, improving the user experience, and making the structure of the seat belt retractor 10 more reliable.

[0054] According to the seat belt retractor 10 of the embodiment of the present application, the holding member 5 applies force to the transmission member 3, the transmission member 3 keeps the mechanical locking assembly in the unlocked state of being separated from the locking wheel 2, the tolerance gap between the transmission member 3 and the mechanical locking assembly is eliminated, and the locking wheel 2, the transmission member 3 and the mechanical locking assembly can keep a relatively stable positional relationship under the action of the holding member 5, and will not appear loosening, displacement or abnormal sound due to the gap, thereby ensuring the stability of the seat belt retractor 10 to be high, improving the durability and user experience.

[0055] In some embodiments of the present application, referring to Figures 1-3As shown, the mechanical locking assembly comprises a pawl 4 movably arranged on the housing 1, which is used to selectively lock or unlock the locking wheel 2. When the pawl 4 is separated from the locking wheel 2 to unlock the locking wheel 2, the force exerted by the retainer 5 on the transmission member 3 is used to drive the transmission member 3 to keep the pawl 4 in the position separated from the locking wheel 2.

[0056] Specifically, the pawl 4 is movably arranged on the housing 1 and can precisely cooperate with the locking wheel 2 or be separated from the locking wheel 2, thereby achieving selective locking or unlocking of the locking wheel 2. If the seat belt retractor 10 is applied to the vehicle 100, when the vehicle 100 encounters an emergency situation (such as a collision, an emergency brake, etc.), the restriction of the transmission member 3 on the pawl 4 is released, and the pawl 4 can quickly lock with the locking wheel 2, effectively limiting the pulling out of the seat belt, ensuring that the occupant is firmly restrained on the seat 30, preventing the body from colliding violently due to inertia, thereby providing reliable safety protection for the occupant. When the pawl 4 is separated from the locking wheel 2 to unlock, the force exerted by the retainer 5 on the transmission member 3 can make the transmission member 3 stably keep the pawl 4 in the unlocked position, effectively avoiding the occurrence of accidental locking of the pawl 4 due to vibration of the vehicle 100, unintentional action of the occupant, or other external interference factors. At the same time, the force exerted by the retainer 5 on the transmission member 3 avoids the shaking of the transmission member 3 and the pawl 4, and eliminates the abnormal sound between the transmission member 3 and the pawl 4.

[0057] In some embodiments of the present application, referring to Figures 1-3 As shown, the transmission member 3 is abutted on the pawl 4 to keep the pawl 4 in the position separated from the locking wheel 2. Thus, the occupant does not need to worry about the accidental change of the pawl 4 at any time when adjusting the seat belt, and the seat belt can always be in a freely adjustable state by relying on the stable abutment of the transmission member 3 and the pawl 4, which is more convenient and easy to operate. At the same time, when the pawl 4 is separated from the locking wheel 2 to unlock the locking wheel 2, the force exerted by the retainer 5 on the transmission member 3 makes the transmission member 3 firmly abut on the pawl 4, avoiding the shaking of the transmission member 3 and the pawl 4, and eliminating the abnormal sound between the transmission member 3 and the pawl 4.

[0058] In some embodiments of the present application, referring to Figures 1-3As shown, the mechanical locking assembly further comprises a vehicle sensing member 6 movably arranged in the housing 1 to selectively lock or unlock the pawl 4 from the locking wheel 2; when the mechanical locking assembly is in the unlocked state, the pawl 4 can limit the movement of the vehicle sensing member 6. Specifically, when the transmission member 3 releases the pawl 4, the vehicle sensing member 6 can drive the pawl 4 to lock or unlock the locking wheel 2 according to the change of the inclination angle and acceleration of the vehicle 100, thereby improving the safety and reliability of the vehicle 100 during driving. Due to the action of the retaining member 5, the transmission member 3 and the pawl 4 can be completely abutted, which limits the free movement of the pawl 4, and the retaining member 5 also makes the pawl 4 fully contact with the vehicle sensing member 6, thereby limiting the movement of the vehicle sensing member 6 and reducing the noise caused by the shaking of the vehicle sensing member 6 during movement.

[0059] In some embodiments of the present application, referring to Figure 2 、 Figure 3 As shown, the driving device 7 is further used to drive the transmission member 3 to separate from the pawl 4, so that the vehicle sensing member 6 is movable. Specifically, the driving device 7 can drive the transmission member 3 to abut or separate from the pawl 4; when the driving device 7 drives the transmission member 3 to abut the pawl 4, the pawl 4 is away from the locking wheel 2, so that the seat belt retractor 10 can be normally used, and the seat belt can be pulled out of or retracted into the seat belt retractor 10. When the driving device 7 drives the transmission member 3 to separate from the pawl 4, the vehicle sensing member 6 drives the pawl 4 to approach the locking wheel 2 after sensing the change of the inclination angle and acceleration of the vehicle 100, so that the pawl 4 is locked with the locking wheel 2, and thus the seat belt is locked by the locking wheel 2 and cannot be pulled out, thereby protecting the safety of the driver and passenger. Therefore, the driving device 7 can realize two states of inhibiting the mechanical locking assembly and normally working of the mechanical locking assembly, and the driving device 7 gives the seat belt retractor 10 the ability of active control, realizes the flexible control of the seat belt function, and improves the intelligent level of the overall safety system of the vehicle 100.

[0060] Optionally, the driving device 7 can be a relay, a motor, an electromagnet, etc., for example Figure 2 As shown, the driving device 7 is a relay.

[0061] In some embodiments of the present application, referring to Figure 2As shown, the mechanical locking assembly further comprises a mounting seat 12, the mounting seat 12 is mounted on the housing 1, the pawl 4 is rotatably mounted on the mounting seat 12, and the vehicle sensing member 6 is movably arranged on the mounting seat 12. Specifically, the pawl 4 and the vehicle sensing member 6 are mounted on the mounting seat 12, and the mounting seat 12 is mounted on the housing 1. This layered structure can make the installation of the pawl 4 and the vehicle sensing member 6 more stable, reduce the risk of damage to the housing 1 caused by excessive local stress, and enhance the overall structural stability of the seat belt retractor 10. At the same time, the mounting seat 12 provides a clear mounting position and positioning reference for the installation of the pawl 4 and the vehicle sensing member 6, improving the installation efficiency and quality of the seat belt retractor 10, and facilitating mass production and assembly. Specifically, the pawl 4, the vehicle sensing member 6 and the mounting seat 12 can be assembled into a mechanical vehicle sensing assembly, and then the mechanical vehicle sensing assembly is mounted on the housing 1.

[0062] In some embodiments of the present application, referring to Figure 4 、 Figure 6 As shown, the mounting seat 12 is provided with an arc-shaped groove 121, and the vehicle sensing member 6 is a steel ball arranged in the arc-shaped groove 121. Specifically, the vehicle sensing member 6 is a steel ball that can roll in any direction in the arc-shaped groove 121. Placing the vehicle sensing member 6 in the arc-shaped groove 121 of the mounting seat 12 makes the vehicle sensing member 6 have a very high sensitivity to changes in the motion state of the vehicle 100. When the transmission member 3 releases the restriction on the pawl 4, a slight change in the position of the vehicle sensing member 6 can make the pawl 4 move closer to the locking wheel 2, so that the seat belt retractor 10 can more accurately determine whether the vehicle 100 is in a dangerous state that requires the safety belt to be locked, thereby improving the safety of the seat belt retractor 10.

[0063] In some embodiments of the present application, referring to Figure 3 、 Figure 9 As shown, the transmission member 3 is adapted to rotate about a first pivot axis 91, the pawl 4 is adapted to rotate about a second pivot axis 92, the vehicle sensing member 6 is subjected to a force F1 from the mounting seat 12, the distance between F1 and the second pivot axis 92 is L1, the transmission member 3 is subjected to a force F2 from the retaining member 5, the distance between F2 and the first pivot axis 91 is L2, and |F1|*L1≤|F2|*L2. Specifically, when |F1|*L1≤|F2|*L2 is satisfied, the transmission member 3 and the pawl 4 can be kept in a state of abutment, and the pawl 4 and the locking wheel 2 are separated, thereby ensuring that the seat belt retractor 10 will not enter a locked state.

[0064] In some embodiments of the present application, referring to Figure 3 、 Figure 9As shown, the driving force of the driving device 7 to drive the mechanical locking assembly to separate from the locking wheel 2 through the transmission member 3 is F3, the distance between F3 and the first pivot shaft 91 is L3, and F1*L1+F2*L2=F3*L3 is satisfied. Specifically, when F3 satisfies F1*L1+F2*L2=F3*L3, the transmission member 3 and the pawl 4 can be kept in the abutting state, the pawl 4 is separated from the locking wheel 2, and thus the safety belt retractor 10 cannot enter the locking state. When the control device determines that there is a dangerous situation, the driving device 7 is powered off, and the driving valve core 72 is ensured to be ejected under the action of the internal spring ejection force. The ejection force (in the opposite direction of F3) needs to be greater than or equal to F3.

[0065] In some embodiments of the present application, the retaining member 5 is connected to the housing 1, or the retaining member 5 is connected to the mounting seat 12. Specifically, the retaining member 5 can be connected to the housing 1 or the mounting seat 12, which provides great flexibility and better adapts to different internal structures of the safety belt retractor 10 and installation environments of the vehicle 100. By selecting a suitable connection position, the space utilization inside the safety belt retractor 10 can be further optimized, internal space crowding or mutual collision between components caused by unreasonable placement of the retaining member 5 can be avoided, the structure of the entire safety belt retractor 10 is more compact and neat, and the limited internal space of the vehicle 100 is effectively utilized.

[0066] In some embodiments, referring to Figure 9 As shown, one end of the retaining member 5 is connected to the transmission member 3, and the other end of the retaining member 5 is connected to the housing 1.

[0067] In embodiments not shown in the figure, one end of the retaining member 5 is connected to the transmission member 3, and the other end of the retaining member 5 is connected to the mounting seat 12.

[0068] In some embodiments of the present application, referring to Figure 9 As shown, the retaining member 5 is an elastic member, and the retaining member 5 is elastically connected between the transmission member 3 and the housing 1.

[0069] In some embodiments of the present application, referring to Figure 3 As shown, the retaining member 5 is an elastic member, or the retaining member 5 is elastically connected between the transmission member 3 and the mounting seat 12.

[0070] Specifically, due to the tolerance gap between the transmission member 3 and the pawl 4, it is impossible to achieve perfect assembly. By designing the retaining member 5 as an elastic member, the transmission member 3 and the pawl 4 can be tightly abutted together when the transmission member 3 approaches the pawl 4, the pawl 4 is away from the locking wheel 2, the tolerance gap between the transmission member 3 and the pawl 4 is eliminated, and the locking wheel 2, the transmission member 3 and the pawl 4 can maintain a relatively stable positional relationship under the action of the elastic member, without loosening, displacement or abnormal noise due to the gap, increasing the design redundancy, making the seat belt retractor 10 more reliable, and ensuring the stability of the seat belt retractor 10.

[0071] When the transmission member 3 drives the pawl 4 away from the locking wheel 2 to unlock the locking wheel 2, due to the action of the elastic force, the transmission member limiting arm 32 and the pawl limiting arm 42 can be in full contact, limiting the free movement of the transmission member limiting arm 32, and fully contacting the transmission member 6 and the pawl 4, reducing the gap between the transmission member 6 and the pawl 4, and further reducing the noise generated by the gap between the transmission member 6 and the pawl 4.

[0072] Optionally, the retaining member 5 can be a spring, an elastic rubber member, an elastic metal sheet, a torsion spring, etc. Figure 1 、 Figure 3 As shown in the figure, the retaining member 5 is a spring.

[0073] In some embodiments, the retaining member 5 can be an electromagnetic member. The retaining member 5 applies an electromagnetic force to the transmission member 3 to maintain the mechanical locking assembly in an unlocked state separated from the locking wheel 2.

[0074] In some embodiments of the present application, referring to Figure 5 、 Figure 6 As shown in the figure, the mechanical locking assembly further includes a mounting seat 12 mounted to the housing 1, the pawl 4 includes a pawl body portion 41, a pawl limiting arm 42 and a pawl portion 43, the pawl body portion 41 is rotatably mounted to the mounting seat 12, the pawl limiting arm 42 is connected to the pawl body portion 41, the transmission member 3 is adapted to lock or separate the pawl limiting arm 42, the pawl portion 43 is connected to the pawl body portion 41, and the pawl portion 43 is used to lock or unlock the locking wheel 2.

[0075] Specifically, the claw 4 is divided into claw body part 41, claw limiting arm 42 and claw part 43, which realizes clear functional division. The claw body part 41 as the basis of rotation can be stably installed on the mounting seat 12 to provide support for the movement of the entire claw 4. The claw limiting arm 42 is used to stop or separate from the transmission member 3, so that the movement of the claw 4 can be controlled by the transmission member 3, so that the transmission member 3 can accurately control the movement of the claw 4, for example, when the transmission member 3 stops the claw limiting arm 42, the claw 4 is limited to the position separated from the locking wheel 2; when the transmission member 3 is separated from the claw limiting arm 42, the claw 4 can be moved to the position of locking cooperation with the locking wheel 2 under the pushing action of the vehicle sensing member 6. The claw part 43 is responsible for locking or unlocking the locking wheel 2, ensuring that the seat belt can be stopped in time when needed, and through such division of labor, each part can focus on specific functions, improving the reliability and accuracy of the entire claw 4 in the process of locking and unlocking the seat belt.

[0076] In some embodiments of the present application, referring to Figure 5 , Figure 6 As shown, the vehicle sensing member 6 is a steel ball, and the claw body part 41 has an arc-shaped groove 411 which is adapted to the shape of the steel ball. Specifically, the vehicle sensing member 6 and the arc-shaped groove 411 on the claw body part 41 are adapted in shape, and any slight change in the position of the vehicle sensing member 6 can be accurately transmitted to the claw body part 41, thereby more accurately triggering the action of the claw 4, so that the seat belt retractor 10 can timely and accurately lock or unlock the seat belt according to the actual state of the vehicle 100.

[0077] It can be understood that "the arc-shaped groove 411 is adapted to the shape of the steel ball" means that the groove wall of the arc-shaped groove 411 is formed as part of the spherical structure. The radius of the groove wall of the arc-shaped groove 411 is not less than the radius of the steel ball.

[0078] In some embodiments of the present application, referring to Figure 7 , Figure 8As shown, the transmission member 3 comprises a transmission member body 31 and a transmission member limiting arm 32, the transmission member body 31 is rotatable, the transmission member limiting arm 32 is connected with the transmission member body 31, and the transmission member limiting arm 32 is suitable for locking or separating the pawl limiting arm 42. Specifically, the abutting or separating structure of the transmission member limiting arm 32 and the pawl limiting arm 42 enables the transmission member 3 to accurately control the pawl 4. During the normal winding and unwinding of the safety belt, the transmission member limiting arm 32 and the pawl limiting arm 42 are kept in abutment, so that the pawl 4 is away from the locking wheel 2, and it is ensured that the safety belt retractor 10 will not be mistakenly locked. When it is necessary to lock the safety belt, the relative position of the transmission member limiting arm 32 and the pawl limiting arm 42 can be changed to separate the transmission member limiting arm 32 and the pawl limiting arm 42, and the sensor 6 can accurately trigger the action of the pawl 4 to lock the pawl 4 with the locking wheel 2, thereby realizing the timely locking of the safety belt. This accurate control method can effectively improve the reliability and accuracy of the safety belt locking function and protect the safety of the driver and passengers.

[0079] In some embodiments of the present application, referring to Figure 9 As shown, the transmission member 3 is rotatably arranged on the housing 1, or referring to Figure 3 As shown, the transmission member 3 is rotatably arranged on the mounting seat 12. Specifically, the transmission member 3 is rotatably arranged on the housing 1 or the mounting seat 12, so that the safety belt retractor 10 can better adapt to different space and layout requirements in the overall structural design. By selecting a suitable mounting position, the layout of the transmission member 3 and other components can be more reasonable, and space conflicts and line entanglements between components can be avoided. Whether it is mounted on the housing 1 or the mounting seat 12, it is helpful to make the overall structure of the safety belt retractor 10 more compact and the connection and interaction between components more efficient.

[0080] In some embodiments, referring to Figure 3 As shown, the transmission member 3 is rotatably arranged on the mounting seat 12, one end of the retaining member 5 is connected with the transmission member 3, and the other end of the retaining member 5 is connected with the mounting seat 12.

[0081] In some embodiments of the present application, referring to Figures 2-3 , Figure 10 As shown, the driving device 7 comprises a driving body 71 and a driving spool 72, the driving spool 72 is suitable for extending and retracting relative to the driving body 71 to drive the transmission member 3 to rotate. Specifically, the driving device 7 drives the transmission member 3 to rotate through the extension and retraction of the driving spool 72 relative to the driving body 71, and the position change of the driving spool 72 can realize accurate control of the rotation angle of the transmission member 3, so that the transmission member 3 can be selectively abutted or separated from the pawl 4.

[0082] As Figure 2As shown, the driving device 7 drives the valve core 72 to move upward to drive the transmission member 3 to rotate clockwise, i.e. in the CW direction in the figure, and the transmission member limiting arm 32 is in abutment with the pawl limiting arm 42 to make the pawl 4 away from the locking wheel 2, and the seat belt retractor 10 works normally. Figure 10 As shown, the driving device 7 drives the valve core 72 to move downward to drive the transmission member 3 to rotate counterclockwise, i.e. in the direction opposite to the CW direction in the figure, and the transmission member limiting arm 32 is separated from the pawl limiting arm 42, and the vehicle sensor 6 controls the pawl 4 to lock with the locking wheel 2 according to the parameters such as the inclination angle and acceleration of the vehicle 100, so that the seat belt retractor 10 locks the seat belt.

[0083] In some embodiments of the present application, referring to Figure 2 As shown, the seat belt retractor 10 further comprises a position detection device 8 for detecting the position information of the driving valve core 72 relative to the driving body 71. Specifically, the position detection device 8 is used to identify the position information of the driving valve core 72 relative to the driving body 71, i.e. to identify whether the driving valve core 72 is in the attracted position or the ejected position, which increases the design redundancy and ensures that the seat belt retractor 10 can accurately understand the state of the driving valve core 72, reduces the control logic error (for example, sending the ejected control signal when the driving valve core 72 is in the ejected position), and increases the design reliability.

[0084] Optionally, the position detection device 8 can be a Hall component, a photoelectric sensor, an ultrasonic sensor, etc.

[0085] Specifically, the position detection device 8 detects that the driving valve core 72 is in the ejected position record 1 and in the attracted position record 0. Then this signal is transmitted to the control unit (for example, ECU). When the control unit receives the signal 1, at this time the electromagnet inside the driving device 7 is in the power-off state and the driving valve core 72 is in the ejected state, then the next time the control unit should send the power-on signal, at this time the driving device 7 performs the power-on operation and makes the driving valve core 72 change to the attracted state; on the contrary, when the control unit receives the signal 0, at this time the electromagnet inside the driving device 7 is in the power-on state and the driving valve core 72 is in the attracted state, then the next time the control unit should send the power-off signal, at this time the electromagnet performs the power-off operation to make the driving valve core 72 change to the ejected state.

[0086] In some embodiments of the present application, referring to Figure 3 , Figure 9As shown, the transmission member 3 is adapted to rotate around the first pivot shaft 91, and the pawl 4 is adapted to rotate around the second pivot shaft 92, the first pivot shaft 91 and the second pivot shaft 92 are arranged separately and in parallel. Specifically, the first pivot shaft 91 and the second pivot shaft 92 are arranged separately, so that the force borne by the transmission member 3 and the pawl 4 during movement can be transmitted to the housing 1 through the first pivot shaft 91 and the second pivot shaft 92 respectively, avoiding the force being concentrated on a certain point or area, effectively reducing the local force burden of the housing 1. At the same time, the first pivot shaft 91 and the second pivot shaft 92 are arranged in parallel, so that the force transmission between the transmission member 3 and the pawl 4 is more efficient, improving the working efficiency of the seat belt retractor 10.

[0087] In some embodiments, referring to Figure 3 As shown, the first pivot shaft 91 is located on the mounting seat 12.

[0088] In some embodiments, referring to Figure 9 As shown, the second pivot shaft 92 is located on the housing 1.

[0089] In some embodiments, the seat belt retractor 10 further comprises a sensing device and a control device, the sensing device is used to sense the inclination angle and acceleration change signal of the vehicle and transmit the signal to the control device, the control device judges the dangerous situation by comparing the change signal with the predetermined threshold value, and sends an instruction signal to control the drive device 7 to be powered on or powered off, so as to realize the locking and unlocking of the seat belt retractor 10. Specifically, when the control device judges that there is no dangerous signal, the drive device 7 drives the transmission member 3 and the pawl 4 to abut, so that the pawl 4 is away from the locking wheel 2, so that the seat belt can be normally stretched, when the control device judges that there is a dangerous signal, the drive device 7 drives the transmission member 3 and the pawl 4 to separate, at this time, the external acceleration and the inclination angle change of the vehicle 100 can be sensed through the vehicle sensing member 6, and then the pawl 4 is driven to abut with the locking wheel 2 to lock the seat belt.

[0090] Optionally, the control device can be an ECU (electronic control unit of the automobile), a PLC (programmable controller), a DCS (distributed control system) and the like.

[0091] In some embodiments, when the inclination angle and acceleration change signal of the vehicle is less than the predetermined threshold value, it is considered that there is no dangerous signal, and when the inclination angle and acceleration change signal of the vehicle is not less than the predetermined threshold value, it is considered that there is a dangerous signal.

[0092] It should be noted that the dangerous situation described in the present application is the situation that meets the emergency locking requirement of the seat belt retractor in the national standard, which will not be described in detail here.

[0093] In some embodiments of the present application, referring to Figure 2 , Figure 9 , Figure 10As shown, the housing 1 is provided with a limiting structure 111, the transmission member 3 is adapted to lock the pawl 4 when rotating in the first direction, and the limiting structure 111 is used to limit the limit position of the transmission member 3 rotating in the first direction (i.e. Figure 2 the clockwise direction). Specifically, the limiting structure 111 can make the pawl 4 perform the unlocking operation as required by the design, prevent damage to the pawl 4, the first pivot shaft 91, the second pivot shaft 92 and the connecting structure therebetween due to excessive rotation of the transmission member 3, ensure that each component of the seat belt retractor 10 can normally operate within a safe working range, and prolong the service life of the seat belt retractor 10.

[0094] In the related art, when the seat belt retractor is actually used, some non-dangerous working conditions that can trigger the seat belt retractor often occur, which also cause the seat belt to be locked and unable to be pulled out, causing great inconvenience to the driver and passenger, and even some functions cannot be used, resulting in a risk of missing the restraint protection of the driver and passenger at some time. For example, in a vehicle with automatic driving, the seat backrest and cushion under the gravity seat can be adjusted at a large angle and rotated by 360°, and when the seat belt retractor is locked within the locking range, the seat belt is locked, affecting the comfort of the driver and passenger, and when the vehicle is parked at a location with a large slope, the posture of the vehicle body can cause the seat belt retractor to be locked, and when the vehicle needs to start driving again, the seat belt may be locked and unable to be pulled out, which poses a safety risk. For another example, in the off-road mode of the vehicle, low-speed creeping is prone to occur, and during the process of the vehicle getting out of trouble, there can be multiple sudden accelerations and decelerations in a short period of time. In such a situation, because it is in a low-speed state, the danger is usually low, but it is easy to cause the seat belt retractor to be continuously locked, thereby holding the driver and passenger, and causing the driver and passenger to complain about the poor comfort of use.

[0095] According to the seat belt retractor 10 of the embodiments of the present application, the driving device 7 is arranged to drive the transmission member 3 to move so that the transmission member 3 is selectively in abutment with or separated from the pawl 4. When the vehicle 100 is in a safe state or does not need the seat belt to be locked in the use working condition, the seat belt can be normally pulled out for use, and when the danger situation or use working condition requires the seat belt to be locked, the seat belt can be ensured to be locked to protect the driver and passenger.

[0096] In some embodiments, the seat belt retractor 10 adopts a combination of mechanical and electronic methods, so that the driving device 7 controls the driving valve core 72 to drive the transmission member 3 to move, and according to different use working scenes, the sensing device senses external signals to actively realize the locking and unlocking of the seat belt retractor 10. When the driving device 7 fails, the electromagnetic device arranged in the driving device 7 will automatically be de-energized, so that the driving valve core 72 is ejected to drive the end of the transmission member 3 close to the vehicle sensing member 6 to move upward, i.e. Figure 2As shown, the transmission component 3 moves in the opposite direction of the first direction CW. The transmission component limiting arm 32 and the pawl limiting arm 42 do not contact each other and have a certain spatial distance. At this time, the vehicle sensing component 6 can work normally. The vehicle sensing component 6 senses the change in the motion state of the vehicle 100 to achieve locking. That is, the vehicle sensing component 6 is supported on the conical groove 121. When the acceleration of the vehicle 100 exceeds the limit (e.g., rapid deceleration) or the tilt angle exceeds the limit, the vehicle sensing component 6 moves under the action of inertial force and gravity, pushing the pawl part 43 to mesh with the teeth of the locking wheel 2 to lock.

[0097] In some embodiments, such as Figure 2 , Figure 3 As shown, when the vehicle 100 is driving normally, the sensing device (e.g., a sensor) senses the changes in the tilt angle and acceleration of the vehicle 100. The control device (e.g., an ECU) receives the signal from the sensor and determines that there is no danger. When this is determined, the drive device 7 is energized, and the drive valve core 72 is attracted and retracted under the action of magnetic force. At this time, the spatial position of the transmission component limiting arm 32 and the pawl limiting arm 42 is at its minimum. Due to the gaps and tolerances of the components, the spatial position of the transmission component limiting arm 32 and the pawl limiting arm 42 is greater than or equal to 0. Due to the action of the retaining component 5 (e.g., a spring), the gap between the transmission component limiting arm 32 and the pawl limiting arm 42 is eliminated, and they come into contact with each other, thereby preventing the seat belt retractor 10 from locking and suppressing the rotation of the vehicle sensing component 6 (e.g., a steel ball). At this time, the pawl part 43 is far away from the locking wheel 2 (e.g., the teeth of a ratchet) and does not come into contact. The locking wheel 2 can rotate freely, thus realizing the free stretching of the seat belt.

[0098] In some embodiments, such as Figure 10 As shown, when the sensor detects a dangerous situation, the drive device 7 is de-energized, and the drive valve core 72 pops out under the action of the spring force inside the drive device 7. The drive valve core 72 pops out and drives the transmission component 3 to move counterclockwise. At the same time, the limit arm 32 of the transmission component at the other end moves counterclockwise. At this time, the seat belt retractor 10 pushes the claw part 43 to rotate counterclockwise under the action of the vehicle sensor 6, so that the claw part 43 engages with the locking wheel 2 to lock the locking wheel 2, thereby completing the restraint of the driver and passengers, and the seat belt cannot be stretched freely.

[0099] In some embodiments, when the drive device 7 is powered on, the drive valve core 72 is in the engaged state, and the pawl part 43 is in the suppressed position, that is, the pawl part 43 is separated from the locking wheel 2, at which time the seat belt can be pulled out normally; when the drive device 7 is powered off, the drive valve core 72 pops out, and the pawl part 43 can rotate freely as initially set, and the vehicle sensing component 6 can selectively lock by sensing acceleration and angle changes.

[0100] In some embodiments, see Figure 2As shown, when the drive spool 72 is ejected downward, the force (i.e. the ejection force mentioned below) required to eject the drive spool 72 to drive the transmission member 3 to rotate needs to be greater than the elastic force F2 applied by the retaining member 5 at the other end of the transmission member 3 to the transmission member 3, so that the drive spool 72 can drive the transmission member 3 to rotate with the first pivot shaft 91, and finally realize that the transmission member limiting arm 32 and the pawl limiting arm 42 are away from each other, so that the vehicle sensing member 6 can normally move.

[0101] Referring to Figure 11 As shown, according to the safety belt device 20 of the second aspect of the present application, the safety belt is suitable for being wound on the winding drum, and the locking wheel 2 is fixed on the winding drum for limiting the winding of the safety belt.

[0102] According to the safety belt device of the second aspect of the present application, the safety belt retractor applies the force to the transmission member 3 through the retaining member 5, so that the transmission member 3 keeps the mechanical locking assembly in the unlocked state away from the locking wheel 2, eliminates the tolerance gap between the transmission member 3 and the mechanical locking assembly, and makes the locking wheel 2, the transmission member 3 and the mechanical locking assembly keep a relatively stable positional relationship under the action of the retaining member 5, so as not to be loose, displaced or abnormally noisy due to the gap, thereby ensuring that the safety belt retractor 10 has high stability, improves the durability and user experience.

[0103] Referring to Figure 12 As shown, according to the seat 30 of the third aspect of the present application, the safety belt device 20 is included.

[0104] According to the seat of the third aspect of the present application, the safety belt retractor of the safety belt device applies the force to the transmission member 3 through the retaining member 5, so that the transmission member 3 keeps the mechanical locking assembly in the unlocked state away from the locking wheel 2, eliminates the tolerance gap between the transmission member 3 and the mechanical locking assembly, and makes the locking wheel 2, the transmission member 3 and the mechanical locking assembly keep a relatively stable positional relationship under the action of the retaining member 5, so as not to be loose, displaced or abnormally noisy due to the gap, thereby ensuring that the safety belt retractor 10 has high stability, improves the durability and user experience.

[0105] Referring to Figure 13 As shown, according to the vehicle 100 of the fourth aspect of the present application, the seat 30 is included.

[0106] According to the fourth aspect of the present application, the seat belt retractor of the seat belt device of the vehicle exerts a force on the transmission member 3 through the retaining member 5, so that the transmission member 3 keeps the mechanical locking assembly in the unlocked state away from the locking wheel 2, eliminates the tolerance gap between the transmission member 3 and the mechanical locking assembly, and keeps the locking wheel 2, the transmission member 3 and the mechanical locking assembly in a relatively stable positional relationship under the action of the retaining member 5, so that the seat belt retractor 10 is stable, and the durability and user experience are improved.

[0107] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0108] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or can be integrated; can be mechanical connection, can also be electrical connection or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0109] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application.

[0110] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as a limitation of the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A seat belt retractor (10) characterized by, The application relates to a safety belt locking device, comprising: a housing (1); a locking wheel (2) rotatably mounted on the housing (1) and used for limiting the winding of a safety belt; a mechanical locking assembly arranged in the housing (1) and used for selectively locking or unlocking the locking wheel (2); a driving device (7); a transmission member (3) in transmission connection with the driving device (7), the driving device (7) being capable of driving the mechanical locking assembly and the locking wheel (2) to be separated to unlock the locking wheel (2) through the transmission member (3); a retaining member (5) exerting a force on the transmission member (3) to drive the transmission member (3) to retain the mechanical locking assembly in a state of being separated from the locking wheel (2) when the mechanical locking assembly and the locking wheel (2) are separated to unlock the locking wheel (2).

2. The seat belt retractor (10) according to claim 1, characterized in that The mechanical locking assembly comprises: a pawl (4) movably arranged in the housing (1) and used for selectively locking or unlocking the locking wheel (2); the retaining member (5) exerts a force on the transmission member (3) to drive the transmission member (3) to retain the pawl (4) in a position of being separated from the locking wheel (2) when the pawl (4) and the locking wheel (2) are separated to unlock the locking wheel (2).

3. The seat belt retractor (10) according to claim 2, characterized in that The transmission member (3) retains the pawl (4) in the position of being separated from the locking wheel (2) by abutting against the pawl (4).

4. The seat belt retractor (10) according to claim 2, characterized in that The mechanical locking assembly further comprises a vehicle sensing member (6) movably arranged in the housing (1) to make the pawl (4) selectively lock or unlock the locking wheel (2); when the mechanical locking assembly is retained in the unlocked state, the pawl (4) is capable of limiting the movement of the vehicle sensing member (6).

5. The seat belt retractor (10) according to claim 4, characterized in that The driving device (7) is further used for driving the transmission member (3) and the pawl (4) to be separated to make the vehicle sensing member (6) movable.

6. The seat belt retractor (10) according to claim 4, characterized in that The mechanical locking assembly further comprises a mounting base (12) mounted on the housing (1), the pawl (4) being rotatably mounted on the mounting base (12), and the vehicle sensing member (6) being movably arranged in the mounting base (12).

7. The seat belt retractor (10) according to claim 6, characterized in that The transmission member (3) is adapted to rotate around a first pivot axis (91), and the pawl (4) is adapted to rotate around a second pivot axis (92); The vehicle sensing member (6) is subjected to a force F1 exerted by the mounting base (12) on the vehicle sensing member (6), the distance between F1 and the second pivot axis (92) being L1, the retaining member (5) exerts a force F2 on the transmission member (3), the distance between F2 and the first pivot axis (91) being L2, and |F1|*L1<=|F2|*L2.

8. The seat belt retractor (10) according to claim 7, characterized in that The driving device (7) drives the mechanical locking assembly to separate from the locking wheel (2) through the transmission member (3), the driving force is F3, the distance between F3 and the first pivot shaft (91) is L3, and F1*L1+F2*L2=F3*L3 is met.

9. The seat belt retractor (10) according to claim 6, characterized in that The retaining member (5) is connected to the housing (1), or the retaining member (5) is connected to the mounting seat (12).

10. The seat belt retractor (10) according to claim 9, characterized in that The retaining member (5) is an elastic member, and the retaining member (5) is elastically connected between the transmission member (3) and the housing (1), or the retaining member (5) is elastically connected between the transmission member (3) and the mounting seat (12).

11. The seat belt retractor (10) according to claim 2, characterized in that The mechanical locking assembly further comprises a mounting seat (12) mounted on the housing (1), and the pawl (4) comprises: A pawl body portion (41) rotatably mounted on the mounting seat (12); A pawl limiting arm (42) connected to the pawl body portion (41), and the transmission member (3) is adapted to lock or separate the pawl limiting arm (42); and A pawl portion (43) connected to the pawl body portion (41), and the pawl portion (43) is used to lock or unlock the locking wheel (2).

12. The seat belt retractor (10) according to claim 11, characterized in that The transmission member (3) comprises a transmission member body (31) and a transmission member limiting arm (32), the transmission member body (31) is rotatable, and the transmission member limiting arm (32) is connected to the transmission member body (31), and the transmission member limiting arm (32) is adapted to lock or separate the pawl limiting arm (42).

13. The seat belt retractor (10) of claim 11, characterized in that The transmission member (3) is rotatably arranged on the housing (1), or the transmission member (3) is rotatably arranged on the mounting seat (12).

14. The seat belt retractor (10) of claim 1, characterized by The driving device (7) comprises a driving body (71) and a driving spool (72), and the driving spool (72) is adapted to be telescopic relative to the driving body (71) to drive the transmission member (3) to rotate.

15. The seat belt retractor (10) according to claim 14, characterized in that The safety belt retractor (10) further comprises a position detection device (8) for detecting position information of the driving spool (72) relative to the driving body (71).

16. The seat belt retractor (10) of claim 2, characterized by The transmission member (3) is adapted to rotate around a first pivot shaft (91), and the pawl (4) is adapted to rotate around a second pivot shaft (92), and the first pivot shaft (91) and the second pivot shaft (92) are separated and arranged in parallel.

17. The seat belt retractor (10) of claim 2, characterized by The housing (1) is provided with a limiting structure (111), and the transmission member (3) is adapted to lock the pawl (4) when rotating in a first direction, and the limiting structure (111) is used to limit the limit position of the transmission member (3) rotating in the first direction.

18. A seat belt arrangement (20) characterized by The safety belt retractor (10) comprises a safety belt, a belt winding drum, and any one of claims 1-17, the safety belt is adapted to be wound on the belt winding drum, and the locking wheel (2) is fixed on the belt winding drum to limit the winding of the safety belt.

19. A seat (30) characterized by, The seat belt arrangement (20) of claim 18.

20. A vehicle (100), characterized in that The seat (30) of claim 19.

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