Split type safety belt retractor

Abstract

The utility model discloses a split type safety belt retractor, relates to the field of automobile protection equipment, and can solve the problem that in the prior art, when a safety belt retractor is mounted on a backrest of a seat, a vehicle sensing element loses an initial mounting position along with adjustment of the inclination angle of the backrest of the seat by a user, and consequently a safety belt is accidentally locked in a non-emergency state. The split type safety belt retractor comprises a retractor frame, a mandrel, a ratchet wheel, a locking block, a pawl device, a vehicle sensing device connected to a vehicle fixing structure and a controller connected to the vehicle fixing structure or a seat backrest and electrically connected with the pawl device. The vehicle sensing device comprises a vehicle sensing base connected to the vehicle fixing structure, a vehicle sensing element placed in the moving space of the vehicle sensing base, and a sensitive cover rotationally connected to the vehicle sensing base and abutting against the vehicle sensing element. The sensitive mechanism rod is connected to one side of the sensitive cover, the detector is connected to the vehicle sensing base and used for detecting the end position of the sensitive mechanism rod, and the detector is electrically connected with the controller.

Description

Technical Field

[0001] The present application relates to the field of automobile protective equipment, and in particular to a split-type seat belt retractor. Background Art

[0002] The seat belt retractor is one of the key safety devices in the vehicle. Its main function is to ensure that passengers are effectively protected during the driving process of the vehicle by controlling the extension and retraction of the seat belt. The seat belt retractor usually includes a freely rotating spindle and a mechanism for locking the spindle. When the vehicle suddenly decelerates, collides or tilts, the retractor can quickly lock the seat belt to prevent passengers from being injured again due to inertia.

[0003] In the prior art, such as Figure 1-8 As shown, the seat belt retractor includes a retractor frame 1, a core shaft 2 rotatably connected to the retractor frame 1 and used for rewinding the seat belt, a ratchet 3 coaxially sleeved on one end of the core shaft 2, a locking block 5 connected to the core shaft 2 and used for cooperating with the ratchet 3, and a vehicle sensing device 4 connected to the retractor frame 1, the vehicle sensing device 4 includes a vehicle sensing base 41, a vehicle sensing element 42 placed in the moving space of the vehicle sensing base 41, a sensitive cover 43 rotatably connected to the vehicle sensing base 41 and abutting against the vehicle sensing element 42, and a sensitive mechanism rod 431 integrally formed on the sensitive cover 43 and used for cooperating with the ratchet 3, the vehicle sensing element 42 (spherical structure) can move in the moving space with the acceleration of the vehicle or the tilt of the vehicle body. The moving space is a space enclosed by the structure of the vehicle sensing base 41 for placing the vehicle sensing element 42. The retractor frame 1 forms a limit ring at the end position of the core shaft 2. The limit ring is formed with a first limit tooth along its circumferential direction. The locking block 5 includes a locking plate 51 with one end embedded in the core shaft 2 and a locking rod 52 integrally formed at the other end of the locking plate 51. The ratchet 3 is provided with a locking groove 31 for embedding the locking rod 52. A second limit tooth 511 matching the first limit tooth is formed on one side of the locking plate 51.

[0004] When the acceleration of the vehicle is greater than the set value, or the tilt angle of the vehicle body is greater than the set value, the vehicle sensing element 42 moves in the moving space, and the vehicle sensing element 42 lifts up the sensitive cover 43, so that the sensitive mechanism rod 431 is also lifted up and meshes with the ratchet teeth of the ratchet 3, restricting the rotation of the ratchet 3. The ratchet 3 stops rotating, and the locking rod 52 slides in the locking groove 31. The groove wall of the locking groove 31 guides and drives the locking rod 52 toward the direction of the first limiting tooth, so that the locking plate 51 moves toward the direction of the first limiting tooth of the limiting ring along with the movement of the locking rod 52 until the first limiting tooth And engage with the second limiting tooth 511, so that the core shaft 2 can be locked on the retractor frame 1 through the locking block 5, the core shaft 2 stops rotating, the seat belt is locked and cannot be pulled out, so safety protection is achieved. When the emergency situation is relieved, that is, the acceleration of the vehicle or the tilt angle of the vehicle body returns to normal, the sensitive mechanism rod 431 disengages from the ratchet 3, and the ratchet 3 continues to rotate with the rotation of the core shaft 2. The locking rod 52 disengages from the drive of the groove wall of the locking groove 31, and the locking block 5 disengages from the first limiting tooth through the reset elastic member 6 between the core shaft 2, and the seat belt can be pulled out normally.

[0005] However, the seat belt retractor in the prior art has some problems in practical application, especially when the seat belt retractor is installed on the seat back, when the passenger adjusts the inclination angle of the seat back, the vehicle sensing element 42 will lose the initial installation position and move, thereby erroneously triggering the sensitive mechanism rod 431. This situation will cause the seat belt to be accidentally locked in a non-emergency state, and the passenger cannot normally pull out the seat belt, thereby causing the function of the seat belt to fail, affecting the comfort and safety of riding. This accidental locking not only affects the normal use of the seat belt, but may also cause inconvenience or potential danger to the passengers in some cases.

[0006] In addition, the vehicle sensing device 4 is installed on the seat belt retractor, and the two are of integrated design. The vehicle sensing device 4 is mainly controlled by gravity and needs to maintain a horizontal posture when in a free state. However, since the installation positions and angles of seat belt retractors of different vehicles are different, the installation angles of seat belt retractors at different positions in the same vehicle may also be different. It is necessary to design vehicle sensing devices 4 with multiple adaptation angles to cope with this. This limits the scope of application of the same type of seat belt retractors. Utility Model Content

[0007] To this end, the present application provides a split seat belt retractor to solve the problem in the prior art that when the seat belt retractor is installed on the seat back, the vehicle sensing element loses its initial installation position as the user adjusts the inclination angle of the seat back, causing the seat belt to be accidentally locked in a non-emergency state.

[0008] In order to achieve the above objectives, this application provides the following technical solutions:

[0009] A split safety belt retractor comprises a retractor frame installed on a seat back or a vehicle fixed structure, a core shaft rotatably connected to the retractor frame and used to reel up the safety belt, a ratchet coaxially sleeved on one end of the core shaft, a locking block connected to the core shaft and used to cooperate with the ratchet, a pawl device connected to the retractor frame and used to cooperate with the ratchet, a vehicle sensing device connected to the vehicle fixed structure and a controller connected to the vehicle fixed structure or the seat back and electrically connected to the pawl device, the vehicle sensing device comprises a vehicle sensing base connected to the vehicle fixed structure, a vehicle sensing element placed in a moving space of the vehicle sensing base, a sensitive cover rotatably connected to the vehicle sensing base and abutting against the vehicle sensing element, a sensitive mechanism rod connected to one side of the sensitive cover and a detector connected to the vehicle sensing base and used to detect the end position of the sensitive mechanism rod, and the detector is electrically connected to the controller.

[0010] Optionally, a switch for cutting off the circuit connection between the detector and the controller is connected between the detector and the controller, so that the pawl of the pawl device is disengaged from the ratchet teeth of the ratchet wheel.

[0011] Optionally, the detector is an electromagnetic sensor, and the sensitive mechanism rod is a magnetic member.

[0012] Optionally, the detector is a photoelectric sensor.

[0013] Optionally, the switch is a normally closed switch.

[0014] Optionally, the controller is a body controller.

[0015] Compared with the prior art, this application has at least the following beneficial effects:

[0016] The present application sets the vehicle sensing device and the retractor frame independently, and the vehicle sensing device is installed on the vehicle fixed structure (such as the A-pillar, B-pillar or C-pillar) instead of the seat back. Since the relative position of the vehicle fixed structure in the vehicle cannot be adjusted at will, this installation method ensures the stability of the vehicle sensing device. The vehicle sensing element of the vehicle sensing device can accurately respond to the acceleration and tilt changes of the vehicle. When the vehicle accelerates, decelerates or tilts, the vehicle sensing element will lift up the sensitive cover, thereby causing the sensitive mechanism rod to shift. The detector will detect the change in the end position of the sensitive mechanism rod and send an electrical signal to the controller. After receiving the signal, the controller will immediately trigger the action of the pawl device, so that the pawl of the pawl device engages with the ratchet teeth of the ratchet wheel, thereby locking the core shaft, thereby protecting the safety of the occupants;

[0017] The present application effectively avoids malfunctions caused by seat adjustment by separating the vehicle sensing device from the retractor frame and fixing the sensing device on the vehicle fixed structure, so that the vehicle sensing device can more accurately detect the dynamic state of the vehicle and timely trigger the locking function of the split seat belt retractor, thereby improving the reliability of the vehicle safety system and solving the problem in the prior art that the seat belt is accidentally locked in a non-emergency state due to the unstable installation position of the sensing device.

[0018] In addition, since the retractor frame 1 and the vehicle sensing device 4 are independent of each other in position, the installation angle of the retractor frame 1 can be selected for installation on the seat back or the vehicle fixed structure according to different vehicle models without affecting the normal use of the vehicle sensing device 4, so that the seat belt retractor involved in the present application can be suitable for a variety of different types of vehicles, and also suitable for the installation of seat belt retractors for seats in different positions in the same vehicle model. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more intuitively illustrate the prior art and the present application, several exemplary drawings are given below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing the present application; for example, those skilled in the art are capable of easily making conventional adjustments or further optimizations to the addition / reduction / attribution division, specific shapes, positional relationships, connection methods, dimensional ratios, etc. of certain units (components) based on the technical concepts and exemplary drawings disclosed in the present application.

[0020] Figure 1 It is a partial structural schematic diagram of a seat belt retractor in the prior art;

[0021] Figure 2 It is a structural schematic diagram of a vehicle sensing device of a seat belt retractor in the prior art;

[0022] Figure 3 for Figure 2 A front view of

[0023] Figure 4 An exploded view of a part of the structure of a seat belt retractor in the prior art;

[0024] Figure 5 It is a schematic diagram of the structure of a ratchet wheel of a seat belt retractor in the prior art;

[0025] Figure 6 for Figure 1 Schematic diagram of some structures;

[0026] Figure 7 for Figure 6 A magnified image of point A;

[0027] Figure 8It is a structural schematic diagram of a locking block of a seat belt retractor in the prior art;

[0028] Fig. 9 A schematic structural diagram of a split-type seat belt retractor provided in one embodiment of the present application.

[0029] Description of reference numerals:

[0030] 1. Retractor frame; 2. Mandrel; 3. Ratchet; 31. Locking groove; 4. Vehicle sensing device; 41. Vehicle sensing base; 42. Vehicle sensing element; 43. Sensitive cover; 431. Sensitive mechanism rod; 5. Locking block; 51. Locking plate; 511. Second limit tooth; 52. Locking rod; 6. Resetting elastic member; 7. Detector; 8. Switch; 9. Controller; 10. Ratchet device; 101. Ratchet. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] In the description of this application: unless otherwise specified, the meaning of "plurality" is two or more. The terms "first", "second", "third", etc. in this application are intended to distinguish the objects referred to, and do not have special meanings in terms of technical connotations (for example, they should not be understood as emphasizing the importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0033] refer to Figure 1-9 The present application discloses a split-type seat belt retractor, comprising a retractor frame 1 installed on a seat back or a vehicle fixed structure, a core shaft 2 rotatably connected to the retractor frame 1 and used to reel up the seat belt, a ratchet 3 coaxially sleeved on one end of the core shaft 2, a locking block 5 connected to the core shaft 2 and used to cooperate with the ratchet 3, a pawl device 10 connected to the retractor frame 1 and used to cooperate with the ratchet 3, a vehicle sensing device 4 connected to the vehicle fixed structure and a controller 9 connected to the vehicle fixed structure or the seat back and electrically connected to the pawl device 10, the vehicle sensing device 4 comprises a vehicle sensing base 41 connected to the vehicle fixed structure, a vehicle sensing element 42 placed in a moving space of the vehicle sensing base 41, a sensitive cover 43 rotatably connected to the vehicle sensing base 41 and abutting against the vehicle sensing element 42, a sensitive mechanism rod 431 connected to one side of the sensitive cover 43 and a detector 7 connected to the vehicle sensing base 41 and used to detect the end position of the sensitive mechanism rod 431, and the detector 7 and the controller 9 are electrically connected.

[0034] The present application sets the vehicle sensing device 4 and the retractor frame 1 independently (split design), and the vehicle sensing device 4 is installed on the vehicle fixed structure (such as the A-pillar, B-pillar or C-pillar) instead of the seat back. Since the relative position of the vehicle fixed structure in the vehicle cannot be adjusted at will, this installation method ensures the stability of the vehicle sensing device 4. The vehicle sensing element 42 of the vehicle sensing device 4 can accurately reflect the acceleration and tilt changes of the vehicle. When the vehicle accelerates, decelerates or tilts, the vehicle sensing element 42 will lift the sensitive cover 43, thereby causing the sensitive mechanism rod 431 to move. The detector 7 will detect the end position change of the sensitive mechanism rod 431 and send an electrical signal to the controller 9. After receiving the signal, the controller 9 will immediately trigger the pawl device 10 to act, so that the pawl 101 of the pawl device 10 engages with the ratchet teeth of the ratchet wheel 3, thereby locking the spindle 2, thereby protecting the safety of the occupants;

[0035] Compared with the prior art, the present application effectively avoids malfunctions caused by seat adjustment by separating the vehicle sensing device 4 from the retractor frame 1 and fixing the sensing device on the vehicle fixed structure, so that the vehicle sensing device 4 can more accurately detect the dynamic state of the vehicle and timely trigger the locking function of the split seat belt retractor, thereby improving the reliability of the vehicle safety system and solving the problem in the prior art that the seat belt is accidentally locked in a non-emergency state due to the unstable installation position of the sensing device.

[0036] In addition, since the retractor frame 1 and the vehicle sensing device 4 are independent of each other in position, the installation angle of the retractor frame 1 can be selected for installation on the seat back or the vehicle fixed structure according to different vehicle models without affecting the normal use of the vehicle sensing device 4, so that the seat belt retractor involved in the present application can be suitable for a variety of different types of vehicles, and also suitable for the installation of seat belt retractors for seats in different positions in the same vehicle model.

[0037] It should be noted that the vehicle fixed structure refers to those parts of the vehicle that cannot be adjusted at will, such as the A-pillar, B-pillar, C-pillar, and the center console of the vehicle. These parts are usually fixed structures of the vehicle body and will not change due to the adjustment of the seat position. In the prior art, the retractor frame 1 can be installed on the vehicle fixed structure or on the seat back, depending on the installation position of the seat belt. Taking a sedan as an example, the retractor frame 1 of the front driver's seat and the co-driver's seat is usually installed on the B-pillar close to the vehicle body, while the retractor frame 1 of the rear middle seat can only be installed on the seat back. For some large commercial vehicles or buses, due to the relationship between the seat arrangement and the vehicle body structure, the seats close to the aisle usually do not have a fixed vehicle body structure for installation, so the retractor frame 1 of these seats is usually also installed on the seat back. In addition, the pawl device 10, the vehicle sensing element 42, the sensitive cover 43, the sensitive mechanism rod 431, the ratchet 3, the spindle 2, etc. are all prior art, and some structures and working principles have been explained in the specification, which will not be repeated here.

[0038] In some embodiments, the pawl device can be an electromagnetic pawl, a pneumatic pawl, a vacuum pawl, a motor-driven pawl, or the like.

[0039] In some embodiments, the retractor frames 1 of multiple seats in the vehicle and related structures connected and installed on the retractor frames 1 can share a vehicle sensing device 4. That is, controlling the seat belts of multiple seats through a vehicle sensing device 4 can greatly reduce costs.

[0040] A switch 8 is connected between the detector 7 and the controller 9 for cutting off the circuit connection between the detector 7 and the controller 9 so that the pawl 101 of the pawl device 10 is disengaged from the ratchet teeth of the ratchet wheel 3 .

[0041] In some special cases, such as when the vehicle rolls over, the passengers may need to escape quickly. However, the vehicle rollover will cause the vehicle sensing element 42 to continuously detect abnormal tilt, so that the seat belt is always locked and cannot be released. In this case, in order to ensure that the passengers can leave the vehicle in time, the system is provided with a switch 8 for cutting off the circuit connection between the detector 7 and the controller 9. When the passenger presses the switch 8 or the rescuer presses the switch 8, the circuit is actively cut off, and the pawl 101 of the pawl device 10 is disengaged from the ratchet teeth of the ratchet wheel 3, so that the core shaft 2 is unlocked, and the seat belt can be pulled out freely, thereby providing the possibility of escaping for the passengers.

[0042] In some embodiments, in order to facilitate user operation, the switch 8 can be installed at a position that is easy for passengers to press, such as the side of the seat, near the vehicle center console, or near the seat belt buckle. These positions are easy to reach, ensuring that passengers can quickly find and operate the switch 8 in an emergency and release the locked state of the seat belt in time.

[0043] The detector 7 is an electromagnetic sensor, and the sensitive mechanism rod 431 is a magnetic member.

[0044] When the vehicle accelerates or tilts, the vehicle sensing element 42 will push the sensitive mechanism rod 431 to move. Since the sensitive mechanism rod 431 itself is a magnetic part (magnet), this displacement will cause its magnetic field to change. The electromagnetic sensor can accurately detect this magnetic field change and convert it into an electrical signal and send it to the controller 9. After receiving the signal, the controller 9 will trigger the pawl device 10, so that the pawl 101 engages with the ratchet teeth of the ratchet wheel 3, thereby locking the seat belt core shaft 2.

[0045] The detector 7 is a photoelectric sensor. When the sensitive mechanism rod 431 moves to a specific position, it blocks or changes the light beam path of the photoelectric sensor. After the photoelectric sensor senses this change, it immediately generates an electrical signal and transmits it to the controller 9. After receiving the signal, the controller 9 activates the pawl device 10, so that the pawl 101 engages with the ratchet teeth of the ratchet wheel 3, thereby locking the spindle 2.

[0046] In some embodiments, the detector 7 may be a proximity switch.

[0047] Switch 8 is a normally closed switch.

[0048] In some embodiments, the switch 8 may also be other types of switches, for example, a push switch or a sliding switch may be used.

[0049] The controller 9 is a body controller 9 (BCM). The body controller 9 (BCM) may be an existing electronic architecture of the vehicle. The BCM has a high degree of integration and expansibility and can share data with other vehicle systems (such as ABS, ESC, etc.).

[0050] In some embodiments, the controller 9 may be other types of controllers 9 such as a PLC.

[0051] In some embodiments, the vehicle sensing device 4 can be detachably connected to the vehicle fixed structure by fasteners such as bolts, or can be welded to the vehicle fixed structure.

[0052] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). To make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

[0053] The above is a relatively specific and detailed description of the present application through general description and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not deviate from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the scope of protection of the claims of the present application.

Claims

1. A split seat belt retractor, characterized in that: The invention comprises a retractor frame installed on a seat back or a vehicle fixed structure, a core shaft rotatably connected to the retractor frame and used for rewinding the seat belt, a ratchet coaxially sleeved on one end of the core shaft, a locking block connected to the core shaft and used for cooperating with the ratchet, a pawl device connected to the retractor frame and used for cooperating with the ratchet, a vehicle sensing device connected to the vehicle fixed structure and a controller connected to the vehicle fixed structure or the seat back and electrically connected to the pawl device, wherein the vehicle sensing device comprises a vehicle sensing base connected to the vehicle fixed structure, a vehicle sensing element placed in a moving space of the vehicle sensing base, a sensitive cover rotatably connected to the vehicle sensing base and abutting against the vehicle sensing element, a sensitive mechanism rod connected to one side of the sensitive cover and a detector connected to the vehicle sensing base and used for detecting the end position of the sensitive mechanism rod, and the detector is electrically connected to the controller.

2. The split-type seat belt retractor according to claim 1, characterized in that: A switch for cutting off the circuit connection between the detector and the controller is connected between the detector and the controller so that the pawl of the pawl device is disengaged from the ratchet teeth of the ratchet wheel.

3. The split-type seat belt retractor according to claim 1 or 2, characterized in that: The detector is an electromagnetic sensor, and the sensitive mechanism rod is a magnetic member.

4. The split-type seat belt retractor according to claim 1 or 2, characterized in that: The detector is a photoelectric sensor.

5. The split-type seat belt retractor according to claim 2, characterized in that: The switch is a normally closed switch.

6. The split-type seat belt retractor according to claim 1, characterized in that: The controller is a vehicle body controller.

Images