Seat belt retractors and complete equipment for vehicle seats

Abstract

The present invention relates to a safety belt retractor for a vehicle seat, which includes a vehicle sensing device, the vehicle sensing device includes a rotatable sensitive seat, and the sensitive seat has a first rotation axis. The safety belt retractor includes a rotatable transmission pulley, the transmission pulley has a second rotation axis, the first rotation axis and the second rotation axis have an intersection, the transmission pulley has a push rod, the push rod is offset relative to the second rotation axis and extends from the body of the transmission pulley, the push rod and the sensitive seat have a contact point, the intersection and the contact point form a connecting line, the connecting line and the first rotation axis form an angle greater than 60°, the sensitive seat is rotatably supported by means of two opposing mounting pins, the mounting pins define the first rotation axis, and the intersection is at the midpoint between the two mounting pins. The present invention also relates to a complete set of equipment for a vehicle seat, which includes two safety belt retractors. The safety belt retractor has a simple structure, compact size, a small number of parts, and is easy to manufacture and install.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle safety technology, and more particularly, to a seat belt retractor for a vehicle seat and a kit including two such seat belt retractors. Background Art

[0002] In the field of vehicle safety technology, a vehicle safety belt may be a safety protection device used to protect passengers when a vehicle encounters an emergency situation such as emergency braking, collision or rollover, wherein the passenger may be restrained by a belt-shaped webbing, which may be retracted by a core shaft of a seat belt retractor and fixed to the vehicle by a locking tongue. The vehicle safety belt may be an important component of a vehicle passive safety system. The vehicle may be, for example, a passenger car, a truck or other means of transportation.

[0003] With the development of vehicle technology, users have higher and higher requirements for vehicle comfort, and the same is true for the comfort of vehicle seats. In the development of vehicle seats, the inclination angle of seat backs has evolved from fixed to adjustable, and the adjustable angle is getting larger and larger. In some commercial vehicles, the seat backs have even been adjusted to an angle close to lying flat.

[0004] Some known seat belt retractors are equipped with a vehicle sensing device, which can be used as a mechanical sensor in the seat belt retractor to sense the vehicle state, such as the acceleration and tilt angle of the vehicle. When an emergency occurs in the vehicle, the vehicle sensing device can sense the emergency state and cause the spindle of the seat belt retractor to lock, preventing the webbing from being further withdrawn from the spindle, so that the occupant can be well restrained by the webbing and thus obtain good safety protection. Typically, the earlier vehicle sensing device is fixedly mounted on the vehicle body or the vehicle seat, which may not meet the technical requirements of an adjustable seat back.

[0005] In addition, there is known an adaptive vehicle sensing device, which can be adjusted together with the seat back by its own gravity. Since the adaptive vehicle sensing device is active, its adaptive angle adjustment range is limited, and the vehicle sensing sensitivity still has room for improvement. For the vehicle sensing device and the locking device, for example, reference can be made to the applicant's patent application CN110027502A.

[0006] In addition, patent document CN102991452B discloses a seat belt retractor for a vehicle seat, which has a vehicle sensing device, and the vehicle sensing device can be constrained by a core wire. Typically, the known seat belt retractor can be installed in a lateral direction in the backrest of the vehicle seat, wherein the rotation axis of the vehicle sensing device and the rotation axis of the transmission box assembly are not parallel to each other. The angular deviation between the two leads to the need to additionally design compensation measures in the transmission process, wherein the core wire winding portion of the transmission pulley can have a non-circular arc shape, so that the speed of rotation of the transmission pulley is adjusted by modifying the curvature of the core wire winding portion and thereby compensating for the deviation of the vehicle sensing device from the vertical position caused by the above-mentioned angular deviation. In another known prior art, a pinion is additionally arranged between the transmission pulley and the vehicle sensing device, the pinion is driven by the transmission pulley and connected to the vehicle sensing device in the form of a spherical hinge, thereby compensating for the deviation of the vehicle sensing device from the vertical position caused by the above-mentioned angular deviation. These compensating measures make the overall structure of the seat belt retractor more complicated, with a larger number of components and larger size. In addition, the additional component matching relationships and dimensional chains will cause new angular deviations. Summary of the invention

[0007] The object of the present invention is to provide a seat belt retractor for a vehicle seat and a set comprising two such seat belt retractors, wherein the seat belt retractor has a simple structure, compact dimensions and a small number of parts.

[0008] According to a first aspect of the invention, a seat belt retractor for a vehicle seat is proposed, comprising a vehicle sensing device, the vehicle sensing device comprising a rotatable sensitive seat, the sensitive seat having a first rotation axis, the seat belt retractor comprising a rotatable transmission pulley, the transmission pulley having a second rotation axis, the first rotation axis and the second rotation axis having an intersection, the transmission pulley having a push rod, the push rod being offset relative to the second rotation axis and extending from the body of the transmission pulley, the push rod having a contact point with the sensitive seat, the intersection and the contact point forming a connecting line, the connecting line forming an angle greater than 60°, preferably greater than 70°, in particular greater than 80°, for example 85° with the first rotation axis, for example the connecting line can be substantially perpendicular to the first rotation axis. The sensitive seat is rotatably supported by means of two opposing mounting pins, the mounting pins defining the first rotation axis, the intersection being at the midpoint between the two mounting pins.

[0009] In this seat belt retractor, the transmission pulley can directly operate the vehicle sensing device, eliminating the additional compensation measures mentioned above in the prior art. Therefore, the overall structure of the seat belt retractor is simpler, the size is more compact, the number of parts is less, it is easy to manufacture and install, and the transmission chain including the transmission pulley can have a higher transmission accuracy.

[0010] In some embodiments, the first rotation axis, the second rotation axis and the connecting line may be coplanar, which may make the overall structure of the seat belt retractor particularly compact and the vehicle sensing device may be particularly well constrained.

[0011] In some embodiments, the connection line may be perpendicular to the first rotation axis or the second rotation axis.

[0012] In some embodiments, the second rotation axis may be parallel to the longitudinal axis of the spindle of the seat belt retractor.

[0013] In some embodiments, the angle between the first rotation axis and the second rotation axis may be determined such that when the seat belt retractor is installed in a vehicle seat backrest tilted in a lateral direction of the backrest, the first rotation axis extends horizontally in the lateral direction of the backrest.

[0014] In some embodiments, the sensitive seat may have a pair of arms, and the push rod may have a ball head. The ball head may be received between the pair of arms, and the center of the ball head may be regarded as the contact point.

[0015] According to the invention, the sensitive seat can be rotatably supported by means of two opposite mounting pins, the mounting pins defining the first rotation axis, the intersection being located at the midpoint between the two mounting pins. This can make the overall structure of the seat belt retractor particularly compact.

[0016] In some embodiments, the drive pulley may be a component of a transmission box assembly, which may also include a first housing component, which may have a center column, the drive pulley is rotatably mounted on the center column, and the center column defines a second rotation axis.

[0017] In some embodiments, the transmission case assembly may include a second housing component, the first housing component and the second housing component forming a housing of the transmission case assembly.

[0018] In some embodiments, the second housing component may constitute a bracket of the sensitive seat, thereby further making the structure compact and reducing the number of parts.

[0019] In some embodiments, the second housing component may have two mounting holes, and the sensitive seat is rotatably supported by means of two opposite mounting pins received in the mounting holes.

[0020] In some embodiments, the push rod may extend parallel to the second rotation axis.

[0021] In some embodiments, the vehicle sensing device may include a sensitive ball and a sensitive claw, wherein the sensitive ball is movably received in the sensitive seat, and the sensitive claw covers the sensitive ball.

[0022] In some embodiments, the vehicle sensing device may include a locking claw, which can be directly or indirectly driven by a movable sensitive element received in the sensitive seat. The sensitive element may be a sliding body or a rolling body. Typically, a sphere may be used as the sensitive element.

[0023] In some embodiments, the vehicle sensing device may include a locking pawl that can be driven by a sensitive pawl and is configured to cooperate with a ratchet wheel mounted on a spindle of the seat belt retractor.

[0024] According to a second aspect of the present invention, a set of equipment for a vehicle seat is proposed, which includes a pair of seat belt retractors for a vehicle seat according to the first aspect of the present invention, wherein a first seat belt retractor is to be installed in the backrest of a first vehicle seat among two side-by-side vehicle seats, and a second seat belt retractor is to be installed in the backrest of a second vehicle seat among the two side-by-side vehicle seats, and the two seat belt retractors are configured to, when installed in the backrest of the vehicle seat, be inclined downward at an angle from the inside to the outside in a transverse direction of the backrest of the vehicle seat in a predetermined upright initial position of the backrest of the vehicle seat.

[0025] In some embodiments, the two seat belt retractors can be configured to, when installed in the backrest of the vehicle seat, be tilted downward at the same angle or different angles in the lateral direction of the backrest of the vehicle seat in a predetermined upright initial position of the backrest of the vehicle seat.

[0026] In some embodiments, the drive pulleys of the two seat belt retractors may be identically constructed.

[0027] In some embodiments, the two seat belt retractors may be identically constructed except for the different positioning angles of the vehicle sensing device relative to the drive pulley.

[0028] In some embodiments, the connection line of each seat belt retractor may be perpendicular to the second rotation axis of the seat belt retractor.

[0029] In some embodiments, the drive pulleys of the two seat belt retractors may be configured differently.

[0030] In some embodiments, the connection line of each seat belt retractor may be perpendicular to the first rotation axis of the seat belt retractor.

[0031] The aforementioned technical features and the technical features to be mentioned later and the technical features shown in the drawings can be combined with each other arbitrarily, as long as they are not contradictory. All technically feasible feature combinations are technical contents recorded in the specification of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be described in more detail below with reference to the accompanying drawings using embodiments.

[0033] Figure 1 is a schematic side view of a vehicle seat with a seat belt retractor.

[0034] Figure 2 is a schematic rear view of two vehicle seats arranged side by side with seat belt retractors in a predetermined substantially upright initial position.

[0035] Figure 3 yes Figure 1 Schematic side view of a seat belt retractor.

[0036] Figure 4 yes Figure 3 Exploded view of the seat belt retractor.

[0037] Figure 5 yes Figure 2 Schematic diagram of the complete equipment.

[0038] Figure 6 yes Figure 3 An exploded view of the transmission box assembly, vehicle sensing device and a section of the core wire assembly of the seat belt retractor.

[0039] Figure 7 is a schematic diagram of another embodiment of a complete set for a vehicle seat. DETAILED DESCRIPTION

[0040] Figure 1 The side view of a vehicle seat with a seat belt retractor is schematically shown. The vehicle can be a passenger car or a truck, in particular a partially autonomous or fully autonomous motor vehicle. The vehicle seat has a seat part 5 and a backrest 4, which can be adjusted from a predetermined position. Figure 1The inclination angle can be adjusted forward and backward from the substantially upright initial position depicted by the solid line in the figure. The initial position can be optimized for the occupant to sit and operate the vehicle. The backrest 4 can be folded forward on the seat 5 to make room. The backrest 4 can be adjusted backward to a maximum inclination position close to horizontal, at which the occupant can rest. With reference to the forward direction of the vehicle, the maximum inclination position can correspond to an inclination angle close to 180°, for example, an inclination angle of approximately 170°. The backrest 4 can be adjusted to any intermediate position between the predetermined initial position and the maximum inclination position according to the needs of the user, for example, it can be adjusted to an inclination angle of approximately 120° or 135°. The two end positions of the backrest 4 are Figure 1 Described by dotted lines.

[0041] The retractor body 1 is fixedly mounted in the backrest 4. The retractor body 1 has an integrated rotatable vehicle sensing device 10 (see Figure 3 and Figure 4 ). An angle adjustment disk assembly 3 can be coaxially mounted on the pivot of the backrest 4, and the angle adjustment disk assembly can be coupled to the vehicle sensing device 10 via the core wire assembly 2, for example, coupled to the vehicle sensing device 10 by means of a transmission box assembly 9. In the predetermined substantially upright initial position of the backrest 4, the vehicle sensing device 10 is in a substantially vertical orientation. In the case where the vehicle sensing device is fixed relative to the backrest, when the backrest is adjusted backwards by a certain angle from the initial position, the vehicle sensing device deviates from the vertical orientation accordingly by this angle. In the case of an adaptive vehicle sensing device, when the backrest is adjusted backwards by a certain angle from the initial position, the vehicle sensing device adaptively rotates by its own gravity and remains in the vertical orientation, however, the active vehicle sensing device has room for improvement in terms of sensitivity, and the angle range of adaptive adjustment typically does not exceed 45°. In the seat belt retractor of the present invention, when the backrest 4 is adjusted backward from the initial position to a certain angle, on the one hand, this causes the vehicle sensing device 10 to deviate from the vertical orientation at this angle accordingly, and on the other hand, it simultaneously causes the angle adjustment disk assembly 3 to pull the core wire assembly 2 and ultimately causes the vehicle sensing device 10 to rotate in the opposite direction at another angle, and the other angle can at least partially compensate for the aforementioned angle, and it is particularly preferred to basically completely compensate for the aforementioned angle and thereby allow the vehicle sensing device 10 to basically remain in the vertical orientation. Since the mobility of the vehicle sensing device 10 is constrained by the angle adjustment disk assembly 3 and the core wire assembly 2, the vehicle sensing sensitivity can even be compared with that of a fixedly mounted vehicle sensing device. At the same time, the vehicle sensing device can be compared with an adaptive vehicle sensing device in terms of positioning angle. In other words, the vehicle sensing device according to the present invention can have both the advantages of a fixedly mounted vehicle sensing device and the advantages of an adaptive vehicle sensing device.

[0042] Figure 22 is a schematic rear view of two vehicle seats arranged side by side in a predetermined substantially upright initial position, each vehicle seat being equipped with a seat belt retractor which is installed in the backrest 4 of the corresponding vehicle seat. In the predetermined upright initial position of the backrest of the vehicle seat, the retractor bodies 1 of the two seat belt retractors are respectively tilted downward at an angle θ from the inside to the outside in the transverse direction of the backrest 4 of the vehicle seat so that the webbing 6 can be optimally oriented and pulled. Typically, the two angles θ can be of the same size, but can also be of different sizes. The two seat belt retractors can be constructed substantially identically, wherein the positioning angles of the vehicle sensing device 10 relative to the spindle of the seat belt retractor are different so that the rotation axis of the vehicle sensing device 10 is oriented substantially horizontally in the installed state.

[0043] Figure 3 yes Figure 1 A schematic diagram of the seat belt retractor, and Figure 4 yes Figure 3 Exploded view of the seat belt retractor. Figure 3 and Figure 4 As shown, the retractor body 1 may include a frame 17. Typically, the frame 17 may be configured as a U-shaped frame. The mandrel 26 for winding the webbing is rotatably supported in the frame 17, and may be equipped with a coil spring that pre-tightens the mandrel 26 in the winding direction and a coil spring side cover that covers the coil spring at one axial end, and the coil spring side cover may be fixed to the frame 17. The coil spring and the coil spring side cover may constitute a coil spring assembly 22. The mandrel 26 may drive the ratchet 21 at the other axial end. Here, the retractor body 1 may have a mechanical inner cover 18 and a mechanical outer cover 23. The ratchet 21 may be received in the mechanical inner cover 18, and the vehicle sensing device 10 may be installed in the mechanical inner cover 18. The mechanical inner cover 18 may in turn be received in the mechanical outer cover 23. The mechanical inner cover 18 and the mechanical outer cover 23 may be fixed to the frame 17 together. When the vehicle is in an emergency, such as a collision or rollover, the vehicle sensing device 10 can lock the ratchet 21 through the locking pawl 8, thereby causing the locking pawl guided by the ratchet to engage with the frame 17 as in Figure 3 The gear ring visible in the figure makes the spindle 26 locked. Regarding the vehicle sensing device 10 and the locking device, for example, reference can be made to the patent application CN110027502A of the applicant.

[0044] The vehicle sensing device 10 may include a rotatably supported sensitive seat 14, a sensitive ball 25 that can move in the sensitive seat, a sensitive claw 15 covering the sensitive ball, and a locking claw 8. The sensitive seat 14 may have a concave bowl surface, in which the sensitive ball 25 is received. In a stationary state, the sensitive ball 25 is at the bottom of the bowl surface. When an emergency occurs in the vehicle, the sensitive ball 25 leaves the bottom of the bowl surface under the action of inertia force, lifts the sensitive claw 15, and the sensitive claw lifts the locking claw 8, so that the locking claw 8 engages with the ratchet 21, thereby causing the core shaft 26 of the seat belt retractor to be locked.

[0045] The seat belt retractor may include an angle adjustment plate assembly 3, which is configured to automatically adjust the positioning angle of the vehicle sensing device 10 when the seat back adjusts its inclination angle, ideally so that the vehicle sensing device 10 can be basically maintained in a vertical orientation. It is also possible that the angle adjustment plate assembly 3 can only partially compensate for the angular deviation of the vehicle sensing device 10 from the vertical direction caused by the seat back adjusting its inclination angle. For example, when the seat back is tilted backward from an upright position by 20° or adjusted to an inclination angle of approximately 110° relative to the vehicle's forward direction, the angle adjustment plate assembly 3 can only compensate for half of the 20° angular deviation of the vehicle sensing device 10 from the vertical direction, so that the vehicle sensing device 10 still has an angular deviation of 10° from the vertical direction. This still improves the vehicle sensing function compared to the case where the vehicle sensing device 10 is fixedly installed and thus has a 20° angular deviation.

[0046] The angle adjustment disk assembly 3 may include a housing. Specifically, the housing may include a box-shaped housing component 13 and a cover plate 11, wherein the cover plate 11 may be fixedly mounted to the backrest 4, and the housing component 13 may be fixedly connected to the cover plate 11. The housing is configured to be connected to the pivot of the backrest 4. Advantageously, the housing may be configured to be fixedly connected coaxially with the pivot of the backrest 4. Therefore, when the backrest 4 rotates around the pivot to adjust the inclination, the housing rotates synchronously with the backrest. This may be particularly simple in structure. However, it is also possible, for example, that the housing is connected to the pivot of the backrest 4 by means of a transmission mechanism, for example, it may be connected to the pivot of the backrest 4 by means of a planetary gear mechanism. The housing component 13 may have a core wire introduction portion, and the core wire 28 of the core wire assembly 2 may be introduced into the housing from the core wire introduction portion 46 and fixed to the core wire fixing portion of the angle adjustment disk 31 with the end 29, for example, by means of a screw 38. The housing component 13 may have a long diameter portion with a longer rotation radius and a short diameter portion with a shorter rotation radius. The housing may rotate in a first rotation direction and in a second rotation direction opposite to the first rotation direction, wherein the first rotation direction corresponds to a backrest tilt angle rearward adjustment direction, and the second rotation direction corresponds to a backrest tilt angle forward adjustment direction.

[0047] The angle adjustment disk assembly 3 may include an angle adjustment disk 31, which is received in a housing and can rotate relative to the housing. To this end, the housing component 13 may have a mounting shaft, and the angle adjustment disk 31 is rotatably mounted on the mounting shaft. The angle adjustment disk 31 may have a long diameter portion with a longer rotation radius and a short diameter portion with a shorter rotation radius, the long diameter portion may have a core wire fixing portion, and the short diameter portion may have a core wire winding portion. Advantageously, the core wire winding portion may be configured as a circumferential groove on the periphery of the short diameter portion of the angle adjustment disk. Preferably, the depth and width of the circumferential groove are not less than the diameter of the core wire. Advantageously, the core wire 28 can be introduced into the angle adjustment disk assembly 3 in a direction tangential to the core wire winding portion and fixed to the core wire fixing portion. The rotation angle range of the housing relative to the angle adjustment disk 13 defines the effective adjustment range of the angle adjustment disk assembly, and the angle rotation range may be, for example, greater than 60°, and in particular greater than 90°.

[0048] The angle adjustment disk assembly 3 may include a wrench 12, which is configured to be mounted without relative rotation relative to the seat 5, and the wrench can limit the rotation of the angle adjustment disk 13. It is particularly advantageous that the angle adjustment disk assembly may also include a wrench slider 7, which is configured to be fixedly mounted relative to the seat 5, and the wrench 12 and the wrench slider 7 can move relative to each other. Here, the combination of the wrench 12 and the wrench slider 7 can be adapted to different vehicle seats, wherein the wrench slider 7 can be simply fixed in the seat 5, and the wrench 12 can be appropriately moved relative to the wrench slider 7, which can compensate for the errors of the components and possible changes in the position of the components when the inclination of the backrest 4 is adjusted.

[0049] In the simplest case, the core wire assembly 2 can only include the core wire 28. However, it is advantageous that the core wire assembly 2 can additionally include a sheath 27. The end of the sheath 27 facing the angle adjustment disk assembly 3 can be fixed in the core wire lead-in portion of the housing. The core wire lead-in portion can lead to the short diameter portion of the housing component 13.

[0050] The other end 30 of the core wire 28 can be transmission-connected to the vehicle sensing device 10, more specifically, the end 30 of the core wire 28 can be transmission-connected to the movable sensitive seat 14 of the vehicle sensing device 10, so that the winding and unwinding of the core wire 28 on the angle adjustment disk 13 can be transmitted to the vehicle sensing device 10. In the illustrated embodiment, the end 30 of the core wire 28 can be coupled to the transmission box assembly 9, which in turn is coupled to the vehicle sensing device 10. The transmission box assembly 9 can be installed in the mechanical outer cover 23.

[0051] The transmission box assembly 9 may include a transmission housing, which includes a first housing part 20 and a second housing part 16. The transmission pulley 19 is rotatably supported on a central column 32 of the first housing part 20. The end 30 of the core wire 28 is fixed to the transmission pulley 19 and can be wound on the periphery of the transmission pulley, especially on a part of the periphery. The transmission pulley 19 may have a push rod 36, which can operate the sensitive seat 14. The winding of the core wire 28 on the angle adjustment disk 13 shortens the effective length of the core wire 28, so that the end 30 of the core wire 28 can drive the transmission pulley 19, so that the push rod of the transmission pulley 19 can operate the sensitive seat 14. For example, the push rod can have a ball head 37, and the sensitive seat 14 can have a pair of arms 34 extending from the body, and the ball head is received between the pair of arms 34. Ideally, the rotation of the sensitive seat 14 caused by the backrest tilt adjustment and the rotation caused by the winding and unwinding of the core wire can offset each other, so that the orientation of the sensitive seat 14 can remain unchanged. Correspondingly, the transmission pulley 19 also remains substantially stationary, wherein the rotation of the transmission pulley caused by the adjustment of the seat back inclination angle and the rotation of the transmission pulley caused by the winding and unwinding of the core wire can substantially offset each other. Advantageously, the transmission box assembly 9 can also include a return spring 24, which preloads the core wire 28. The return spring can be a torsion spring. The second housing part 16 can constitute a bracket for the sensitive seat 14, which is rotatably supported by means of two opposing mounting pins 33, which are mounted in mounting holes 35 of the second housing part 16.

[0052] like Figure 5 and Figure 6 As shown, the sensitive seat 14 has a first rotation axis A1, which can be defined by a mounting pin 33 installed in a mounting hole 35. The transmission pulley 19 has a second rotation axis A2, which can be defined by a central column 32. The first rotation axis A1 and the second rotation axis A2 have an intersection P1, and advantageously, the intersection P1 can be located at the midpoint between the two mounting pins 35. The push rod 36 of the transmission pulley 19 can be offset relative to the second rotation axis A2 and extend from the body of the transmission pulley 19, and the push rod 36 can have a contact point P2 with the sensitive seat 14. The center of the ball head 37 of the push rod 36 can be regarded as the contact point P2. The intersection P1 and the contact point P2 form a connecting line A3. The connecting line A3 forms an angle greater than 60° with the first rotation axis A1, especially an angle greater than 70°, especially an angle greater than 80°, preferably an angle greater than 85°, for example, the connecting line A3 is substantially perpendicular to the first rotation axis A1. Particularly advantageously, the first rotation axis A1 , the second rotation axis A2 and the connecting line A3 may be substantially coplanar.

[0053] exist Figure 5In the complete set for a vehicle seat shown, the two seat belt retractors can be identically constructed except for the different positioning angles of the vehicle sensing device 10 relative to the drive pulley 19, wherein the connecting line A3 of each seat belt retractor is perpendicular to the second rotation axis A2. This embodiment can be particularly advantageous when the inclination angle θ is small, for example, not more than 20°.

[0054] exist Figure 7 In another embodiment of the complete set for vehicle seats shown, in addition to the different positioning angles of the vehicle sensing device 10 relative to the transmission pulley 19, the push rod 36 of the transmission pulley 19 is also constructed with different lengths, wherein the connecting line A3 of each seat belt retractor is perpendicular to the first rotation axis A1, and in other respects, the two seat belt retractors can be constructed identically. This embodiment can be particularly advantageous when the inclination angle θ is large, for example, more than 20°. Figure 7 Only the transmission box assembly 9 and the vehicle sensing device 10 of the seat belt retractor are described, and other components of the seat belt retractor are omitted. For these other components, please refer to Figure 5 and for Figure 5 Detailed description.

[0055] It should be noted that the terms used herein are for the purpose of illustrating specific aspects only and are not intended to limit the disclosure. As used herein, the singular forms "a" and "the one" shall include the plural forms unless the context clearly states otherwise. It is understood that the terms "include" and "comprises" and other similar terms, when used in the application documents, specify the existence of the stated operations, elements and / or parts, without excluding the existence or addition of one or more other operations, elements, parts and / or combinations thereof. As used herein, the term "and / or" includes all arbitrary combinations of one or more related enumerated items. In the description of the drawings, similar reference numerals always represent similar elements.

[0056] The thickness of the elements in the accompanying drawings can be exaggerated for the sake of clarity. It is also understood that if an element is referred to as being on another element, coupled to another element or connected to another element, then the element can be directly formed on the other element, coupled to it or connected to it, or one or more intervening elements can be arranged between them. On the contrary, if the expressions "directly on...", "directly coupled to..." and "directly connected to..." are used herein, then there is no intervening element. Other words used to illustrate the relationship between elements should be similarly interpreted, such as "between..." and "directly between...", "attachment" and "direct attachment", "adjacent" and "directly adjacent", etc.

[0057] Terms such as "top," "bottom," "above," "below," "above," "below," etc. are used herein to describe the relationship of one element, layer or region to another element, layer or region as illustrated in the drawings. It will be understood that these terms are intended to encompass other orientations of the device in addition to the orientation depicted in the drawings.

[0058] It is to be understood that although the terms "first", "second", etc. may be used herein to describe different elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Therefore, the first element may be referred to as the second element without departing from the teachings of the present invention.

[0059] It is also contemplated that all exemplary embodiments disclosed herein may be arbitrarily combined with one another. Finally, it should be noted that the above embodiments are only used to understand the present invention and do not limit the scope of protection of the present invention. For those skilled in the art, modifications may be made based on the above embodiments, and these modifications do not depart from the scope of protection of the present invention.

Claims

1. A seat belt retractor for a vehicle seat, comprising a vehicle sensing device (10), the vehicle sensing device comprising a rotatable sensitive seat (14), the sensitive seat having a first rotation axis (A1), characterized in that: The seat belt retractor comprises a rotatable transmission pulley (19), the transmission pulley having a second rotation axis (A2), the first rotation axis and the second rotation axis having an intersection (P1), the transmission pulley having a push rod (36), the push rod being offset relative to the second rotation axis and extending from the body of the transmission pulley, the push rod having a contact point (P2) with a sensitive seat, the intersection and the contact point forming a connecting line (A3), the connecting line forming an angle greater than 60° with the first rotation axis (A1), wherein the sensitive seat is rotatably supported by means of two opposing mounting pins (33), the mounting pins defining the first rotation axis (A1), the intersection (P1) being located at the midpoint between the two mounting pins.

2. The seat belt retractor for a vehicle seat according to claim 1, characterized in that: The first rotation axis (A1), the second rotation axis (A2) and the connecting line (A3) are coplanar.

3. The seat belt retractor for a vehicle seat according to claim 1 or 2, characterized in that: The angle is greater than 70°.

4. The seat belt retractor for a vehicle seat according to claim 1 or 2, characterized in that: The angle is greater than 80°.

5. The seat belt retractor for a vehicle seat according to claim 1 or 2, characterized in that: The connecting line is perpendicular to the first rotation axis or the second rotation axis.

6. The seat belt retractor for a vehicle seat according to claim 1 or 2, characterized in that: The second rotation axis is parallel to the longitudinal axis (A0) of the spindle of the seat belt retractor, and the angle between the first rotation axis and the second rotation axis is determined such that, when the seat belt retractor is installed in a vehicle seat backrest in an inclined manner in a transverse direction of the backrest, the first rotation axis extends horizontally in the transverse direction of the backrest.

7. The seat belt retractor for a vehicle seat according to claim 1 or 2, characterized in that: The sensitive seat has a pair of arms (34), and the push rod has a ball head (37). The ball head is received between the pair of arms, and the center of the ball head is regarded as the contact point.

8. The seat belt retractor for a vehicle seat according to claim 1 or 2, characterized in that: The transmission pulley (19) has a peripheral edge for winding the core wire (28) of the core wire assembly (2).

9. The seat belt retractor for a vehicle seat according to claim 8, characterized in that: An end (30) of a core wire (28) is fixed to the transmission pulley (19), and the core wire (28) is wound around a portion of the circumference of the transmission pulley.

10. The seat belt retractor for a vehicle seat according to claim 1 or 2, characterized in that: The driving pulley (19) directly operates the vehicle sensing device.

11. The seat belt retractor for a vehicle seat according to claim 1 or 2, characterized in that: The transmission pulley is a component of a transmission box assembly (9), which further comprises a first housing component (20), the first housing component having a central column (32), the transmission pulley being rotatably mounted on the central column, the central column defining a second rotation axis.

12. The seat belt retractor for a vehicle seat according to claim 11, characterized in that: The transmission box assembly comprises a second shell component (16), wherein the first shell component and the second shell component constitute a shell of the transmission box assembly, the second shell component constitutes a bracket of the sensitive seat, the second shell component has two mounting holes (35), and the sensitive seat is rotatably supported by means of the two opposing mounting pins (33) received in the two mounting holes.

13. The seat belt retractor for a vehicle seat according to claim 1 or 2, characterized in that: The push rod extends parallel to the second rotation axis.

14. A complete set of equipment for vehicle seats, characterized in that: The complete set of equipment includes a pair of seat belt retractors for vehicle seats according to any one of claims 1 to 13, wherein a first seat belt retractor is to be installed in the backrest of a first vehicle seat among two side-by-side vehicle seats, and a second seat belt retractor is to be installed in the backrest of a second vehicle seat among the two side-by-side vehicle seats, and the two seat belt retractors are configured to, when installed in the backrest of the vehicle seat, be tilted downward at an angle (θ) from the inside to the outside in the transverse direction of the backrest of the vehicle seat in a predetermined upright initial position of the backrest of the vehicle seat.

15. The kit for a vehicle seat according to claim 14, characterized in that The two seat belt retractors are configured to be tilted downward at the same angle (θ) in the transverse direction of the vehicle seat backrest in a predetermined upright initial position of the vehicle seat backrest when installed in the vehicle seat backrest.

16. The kit for a vehicle seat according to claim 14, characterized in that The drive pulleys of the two belt retractors are of identical design.

17. A kit for a vehicle seat according to claim 16, characterized in that Apart from the different positioning angles of the vehicle sensing device relative to the drive pulley, the two seat belt retractors are designed identically.

18. The kit for a vehicle seat according to claim 16, characterized in that The connecting line of each seat belt retractor is perpendicular to the second rotation axis of the seat belt retractor.

19. The kit for a vehicle seat according to claim 14, characterized in that The drive pulleys of the two belt retractors are designed differently.

20. The kit for a vehicle seat according to claim 19, characterized in that The connecting line of each seat belt retractor is perpendicular to the first rotation axis of the seat belt retractor.

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