Active pre-tightening force limiting type safety belt

Abstract

The utility model discloses an active pre-tightening force limiting type safety belt which comprises a frame. The mandrel assembly is used for connecting and winding the braid; the clutch is used for realizing positive and negative rotation of the mandrel assembly; the locking assembly is used for limiting and locking the mandrel assembly in case of emergency; the motor is arranged on the frame; the transmission assembly is used for transmission between the motor and the clutch; the shell is used for protecting the transmission assembly; the coil spring assembly is used for resetting the mandrel assembly; compared with a traditional outer ratchet wheel type clutch, the inner ratchet wheel type clutch is arranged, so that the response time of overall transmission of the active pre-tightening force limiting type safety belt is shorter, collision can occur only when ratchets are meshed with pawls during normal operation of the clutch, the vibration amplitude is small, and the noise is small.

Description

Technical Field

[0001] This utility model relates to the field of active pretensioning seat belt technology, specifically an active pretensioning force-limiting seat belt. Background Technology

[0002] Traditional seat belts lack human-centered design and, without force-limiting devices, provide insufficient protection for the chest cavity. Therefore, traditional seat belts are less safe than active pretensioner seat belts. Active pretensioner seat belts, on the other hand, are automotive safety devices that integrate active and passive safety technologies. They can proactively pretension the seat belt before a collision, restraining occupants in advance and significantly improving passenger safety.

[0003] Active pretensioner seat belts work in conjunction with a vehicle's active safety systems (such as AEB automatic emergency braking) to receive hazard signals from the vehicle. When the vehicle's sensors detect a potential collision hazard, the active pretensioner of the seat belt activates rapidly, using a motor or explosive pretensioner to tighten the seat belt, eliminating the gap between the seat belt and the occupant and restraining the occupant to the seat. Before a collision occurs, active pretensioner seat belts can correct the occupant's out-of-position seating posture, placing them in a safer position and reducing injury during a collision.

[0004] Currently, the known active pretensioning seat belts on the market have a long response time and use more parts. Active pretensioning seat belts are generally used in high-end motor vehicles and will also be popularized in better pure electric vehicles in the future. The large number of parts can easily bring more noise during operation, which lowers the quality of high-end motor vehicles. Summary of the Invention

[0005] In view of the shortcomings of the prior art, this utility model provides an active pretensioning force-limiting seat belt, the purpose of which is to solve the problems in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an active pretensioning force-limiting seat belt, comprising:

[0007] A frame, wherein circular through holes are provided on both sides of the frame;

[0008] A mandrel assembly, which is disposed within a frame and extends from both ends of the frame through circular through holes for connecting and winding up the webbing;

[0009] The clutch is mounted on the end of the spindle assembly extending from one side of the frame and is used to realize the forward and reverse rotation of the spindle assembly;

[0010] A locking assembly, which is disposed on the side of the frame away from the clutch and connected to the spindle assembly, is used to limit and lock the spindle assembly in case of an emergency.

[0011] An electric motor, which is mounted on the frame;

[0012] A transmission assembly is disposed on the side of the frame away from the locking assembly and is connected to the clutch and the motor drive respectively, for transmission between the motor and the clutch;

[0013] A housing, disposed on the side of the frame away from the locking assembly, is used to protect the transmission assembly;

[0014] A coil spring assembly is disposed on the housing and connected to the spindle assembly for resetting the spindle assembly.

[0015] Furthermore, the clutch includes a guide worm gear, a first pawl, a blocking disc, and an inner ratchet; the guide worm gear is hollow inside and open on both sides, with an inner ratchet movably fitted inside the guide worm gear, and a blocking disc movably disposed inside the inner ratchet. Fixed seats are symmetrically arranged on the inner side of the blocking disc, and the tail end of the first pawl is movably disposed on the fixed seats, allowing the first pawl to rotate around the fixed seats via its tail end; a limit head is also provided on the first pawl; a limit panel is provided on the opening of the guide worm gear on one side of the outer casing, and a limit groove is provided on the limit panel to cooperate with the first pawl, with the limit head slidably connected to the corresponding limit groove; a spline is provided on the side of the inner ratchet opposite to the outer casing, and the spline is connected to the end of the spindle assembly extending out of the circular through hole of the frame.

[0016] Furthermore, the transmission assembly consists of a transmission rod and a fixing member; the transmission rod is connected to the frame on one side of the clutch via the fixing member that is movably connected at both ends; a worm wheel and a worm are respectively provided at both ends of the transmission rod; the worm wheel on the transmission rod is connected to the worm provided at the motor transmission end, and the worm on the transmission rod is connected to the guide worm wheel.

[0017] Furthermore, the spindle assembly consists of a spindle and a force-limiting shaft. The spindle is movably disposed within the frame. One end of the spindle is connected to one end of the force-limiting shaft, and the other end of the force-limiting shaft is connected to the locking assembly. The spindle is connected to a spline at the opposite end of the force-limiting shaft and then connected to a coil spring assembly via a shaft extension. The webbing is disposed on the spindle.

[0018] Furthermore, it also includes a control component housing disposed on the outer shell, and a groove for the movement of the shaft extension is provided between the outer shell and the control component housing, and the shaft extension is disposed in the groove; both the outer shell and the control component housing are provided with through holes for the two ends of the shaft extension to pass through.

[0019] Furthermore, the coil spring assembly is disposed on the housing of the control assembly, one end of the shaft extension passes through the through hole on the housing and connects to the spindle, and the other end of the shaft extension passes through the through hole on the housing of the control assembly and connects to the coil spring assembly.

[0020] Furthermore, the coil spring assembly consists of a cover plate, a coil spring, and a core head. The cover plate is disposed on the housing of the control component, and a coil spring is disposed inside the cover plate. A core head is connected to the center of the coil spring, and the core head is connected to the shaft extension.

[0021] Compared with existing technologies, this utility model has the following advantages: By setting an internal ratchet clutch, compared with the traditional external ratchet clutch, this utility model makes the overall transmission response time of the active pretensioning and force-limiting seat belt shorter, providing more ample response time for the active pretensioning and force-limiting seat belt, thereby improving overall reliability. Moreover, during normal operation of the clutch, only the ratchet teeth and pawl engage, resulting in impact, small vibration amplitude, and low noise, thus improving the driver's driving experience. This utility model has a small overall size, light weight, and compact structure, reducing the overall size and weight of the seat belt, saving space in the vehicle, and making installation easier. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0023] Figure 2 This is an exploded view of the overall structure of this utility model.

[0024] Figure 3 This is a schematic diagram of the connection structure of the transmission component, motor, and clutch of this utility model.

[0025] Figure 4 This is an exploded view of the front of the clutch of this utility model.

[0026] Figure 5 This is an exploded view of the clutch of this utility model from the reverse side.

[0027] Figure 6 This is a schematic diagram of the blocking disk structure of this utility model.

[0028] Figure 7 This is a schematic diagram of the disk top connection structure of this utility model.

[0029] Figure 8 This is a schematic diagram of the coil spring assembly structure of this utility model.

[0030] Figure 9 This is a schematic diagram of the frame structure of this utility model.

[0031] In the diagram, 1. Frame; 101. Positioning groove; 102. Buckle; 103. Positioning opening; 2. Clutch; 201. Guide worm gear; 202. First pawl; 203. Restriction disc; 204. Inner ratchet; 205. Fixed seat; 206. Limiting plate; 207. Limiting head; 208. Limiting panel; 209. Limiting slide; 2010. Spline; 3. Motor; 4. Transmission assembly; 41. Transmission rod; 42. Fixing component; 5. Housing; 6. Control assembly housing; 7. Spring assembly; 71. Cover plate; 72. Spring; 73. Core head; 8. Locking assembly; 9. Mandrel; 10. Disc top; 11. Shaft extension; 12. Force limiting shaft; 13. Webbing. Detailed Implementation

[0032] like Figure 1 , Figure 2 As shown, this utility model provides a technical solution: an active pretensioning force-limiting seat belt, comprising:

[0033] Frame 1, with circular through holes on both sides.

[0034] A mandrel assembly is disposed within the frame 1, with both ends extending out of the frame 1 through circular through holes for connecting and winding the webbing 13.

[0035] Clutch 2, which is installed on the end of the spindle assembly extending from one side of the frame 1, is used to realize the forward and reverse rotation of the spindle assembly.

[0036] Locking assembly 8, which is disposed on the side of the frame 1 away from the clutch 2 and connected to the spindle assembly, is used to limit and lock the spindle assembly in case of emergency.

[0037] Motor 3, which is mounted on frame 1.

[0038] The transmission component 4 is located on the side of the frame 1 away from the locking component 8, and is connected to the clutch 2 and the motor 3 respectively for transmission between the motor 3 and the clutch 2.

[0039] The outer casing 5 is disposed on the side of the frame 1 away from the locking assembly 8 and is used to protect the transmission assembly 4.

[0040] A coil spring assembly 7 is disposed on the housing 5 and connected to the spindle assembly for resetting the spindle assembly.

[0041] like Figure 3 As shown, the transmission assembly 4 consists of a transmission rod 41 and a fixing member 42; the transmission rod 41 is connected to the frame 1 on one side of the clutch 2 through the fixing member 42 which is movably connected at both ends; a worm gear and a worm are respectively provided at both ends of the transmission rod 41.

[0042] like Figures 4-6 As shown, the clutch 2 includes a guide worm gear 201, a first pawl 202, a blocking disc 203, and an inner ratchet 204. The guide worm gear 201 is hollow inside and open on both sides. The inner ratchet 204 is movably sleeved inside the guide worm gear 201. The blocking disc 203 is movably arranged inside the inner ratchet 204. Fixed seats 205 are symmetrically arranged on the inner side of the blocking disc 203. The tail end of the first pawl 202 is movably mounted on the fixed seat 205. The first pawl 202 passes through the fixed seat 205 by its tail end. 5. Performs circular motion; the first pawl 202 is also provided with a limiting head 207; the guide worm gear 201 is provided with a limiting panel 208 on the opening on one side of the outer shell 5, and the limiting panel 208 is provided with a limiting groove 209 for use with the first pawl 202, and the limiting head 207 is slidably connected in the corresponding limiting groove 209; the inner ratchet 204 is provided with a spline 2010 on the side opposite to the outer shell 5, and the spline 2010 is connected to the end of the spindle assembly that extends out of the circular through hole of the frame 1.

[0043] The worm gear on the transmission rod 41 is connected to the worm gear on the transmission end of the motor 3, and the worm gear on the transmission rod 41 is connected to the guide worm wheel 201.

[0044] The blocking disk 203 is also provided with a limiting piece 206 for limiting the range of motion of the first pawl 202.

[0045] The transmission rod 41 is connected to the fixing member 42 by a steel rod, and a bearing is provided at the connection between the steel rod and the transmission rod 41.

[0046] The guide worm gear 201 is the driving wheel. When the guide worm gear 201 rotates counterclockwise, the limiting head 207 on the first pawl 202 slides along the limiting groove 209 on the guide worm gear 201, causing the first pawl 202 to move in a circle around the fixed seat 205 through its tail end, thereby opening outward. The first pawl 202 is embedded in the ratchet teeth of the inner ratchet 204, causing the inner ratchet 204 to rotate. The inner ratchet 204 drives the spindle assembly to rotate clockwise through the spline 2010 to retract the webbing 13. When the webbing 13 is pulled out, the spindle assembly reverses and drives the inner ratchet 204 to reverse. The ratchet teeth of the inner ratchet 204 push the first pawl 202 back to its original position, thereby disconnecting the connection with the first pawl 202 and not obstructing the pulling out of the webbing 13.

[0047] The spindle assembly consists of a spindle 9 and a force-limiting shaft 12. The spindle 9 is movably disposed within the frame 1. One end of the spindle 9 is connected to one end of the force-limiting shaft 12, and the other end of the force-limiting shaft 12 is connected to the locking assembly 8. The end of the spindle 9 opposite to the force-limiting shaft 12 is connected to the spline 2010 and then connected to the coil spring assembly 7 through the shaft extension 11. The webbing 13 is disposed on the spindle 9.

[0048] like Figure 7 As shown, a disc top 10 is provided between the spline 2010 and the blocking disc 203 to prevent the spindle 9 from directly contacting and rubbing against the blocking disc 203 during rotation, which would cause the blocking disc 203 to drive the spindle 9 to rotate.

[0049] It also includes a control component housing 6 disposed on the housing 5, and a groove for the movement of the shaft extension 11 is provided between the housing 5 and the control component housing 6, and the shaft extension 11 is disposed in the groove; both the housing 5 and the control component housing 6 are provided with through holes for the two ends of the shaft extension 11 to pass through.

[0050] The coil spring assembly 7 is mounted on the control assembly housing 6. One end of the shaft extension 11 passes through the through hole on the housing 5 and connects to the spindle 9. The other end of the shaft extension 11 passes through the through hole on the control assembly housing 6 and connects to the coil spring assembly 7. Since the length of the spindle 9 is insufficient to match the coil spring assembly 7, a shaft extension 11 is added between the two assemblies.

[0051] like Figure 8 As shown, the coil spring assembly 7 consists of a cover plate 71, a coil spring 72, and a core head 73. The cover plate 71 is disposed on the housing 6 of the control assembly. The coil spring 72 is disposed inside the cover plate 71. The core head 73 is connected to the center of the coil spring 72. The core head 73 is connected to the shaft extension member 11.

[0052] When the spindle 9 rotates, it drives the shaft extension 11 to rotate, giving the coil spring 72 greater deformation energy. When the spindle 9 is released, the coil spring 72 releases its deformation energy, causing the spindle 9 to reverse and reset, and retract the webbing 13.

[0053] like Figure 9 As shown, the frame 1 is also provided with two positioning slots 101, one buckle 102, and one positioning opening 103; different webbing limit openings can be installed through the two positioning slots 101 (different models require different webbing 13 pull-out angles and heights), the buckle 102 can be used to snap the active pretensioning and force-limiting seat belt into the opening of the vehicle's B-pillar to reduce the lateral freedom of the active pretensioning and force-limiting seat belt, and the positioning opening 103 can be used to install the active pretensioning and force-limiting seat belt.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An active pretensioning force-limiting seat belt, characterized in that, include: A frame, wherein circular through holes are provided on both sides of the frame; A mandrel assembly, which is disposed within a frame and extends from both ends of the frame through circular through holes for connecting and winding up the webbing; The clutch is mounted on the end of the spindle assembly extending from one side of the frame and is used to realize the forward and reverse rotation of the spindle assembly; A locking assembly, which is disposed on the side of the frame away from the clutch and connected to the spindle assembly, is used to limit and lock the spindle assembly in case of an emergency. An electric motor, which is mounted on the frame; A transmission assembly is disposed on the side of the frame away from the locking assembly and is connected to the clutch and the motor drive respectively, for transmission between the motor and the clutch; A housing, disposed on the side of the frame away from the locking assembly, is used to protect the transmission assembly; A coil spring assembly is disposed on the housing and connected to the spindle assembly for resetting the spindle assembly.

2. The active pretensioning force-limiting seat belt according to claim 1, characterized in that: The clutch includes a guide worm gear, a first pawl, a blocking disc, and an inner ratchet. The guide worm gear is hollow inside and open on both sides. An inner ratchet is movably fitted inside the guide worm gear, and a blocking disc is movably arranged inside the inner ratchet. Fixed seats are symmetrically arranged on the inner side of the blocking disc. The tail end of the first pawl is movably mounted on the fixed seats, and the first pawl moves in a circle around the fixed seats through its tail end. A limit head is also provided on the first pawl. A limit panel is provided on the opening of the guide worm gear on one side of the outer shell. The limit panel is provided with a limit groove that cooperates with the first pawl, and the limit head is slidably connected in the corresponding limit groove. A spline is provided on the side of the inner ratchet opposite to the outer shell. The spline is connected to the end of the spindle assembly that extends out of the circular through hole of the frame.

3. The active pretensioning force-limiting seat belt according to claim 2, characterized in that: The transmission assembly consists of a transmission rod and a fixing component; the transmission rod is connected to the frame on one side of the clutch via the fixing component that is movably connected at both ends; a worm wheel and a worm are respectively provided at both ends of the transmission rod; the worm wheel on the transmission rod is connected to the worm provided at the motor transmission end, and the worm on the transmission rod is connected to the guide worm wheel.

4. The active pretensioning force-limiting seat belt according to claim 3, characterized in that: The mandrel assembly consists of a mandrel and a force-limiting shaft. The mandrel is movably disposed within the frame. One end of the mandrel is connected to one end of the force-limiting shaft, and the other end of the force-limiting shaft is connected to the locking assembly. The end of the mandrel opposite to the force-limiting shaft is connected to a spline and then connected to a coil spring assembly via a shaft extension. The webbing is disposed on the mandrel.

5. The active pretensioning force-limiting seat belt according to claim 4, characterized in that: It also includes a control component housing disposed on the outer shell, and a groove for the movement of the shaft extension is provided between the outer shell and the control component housing, and the shaft extension is disposed in the groove; both the outer shell and the control component housing are provided with through holes for the two ends of the shaft extension to pass through.

6. The active pretensioning force-limiting seat belt according to claim 5, characterized in that: The coil spring assembly is disposed on the housing of the control assembly. One end of the shaft extension passes through the through hole on the housing and connects to the spindle, while the other end of the shaft extension passes through the through hole on the housing of the control assembly and connects to the coil spring assembly.

7. The active pretensioning force-limiting seat belt according to claim 6, characterized in that: The coil spring assembly consists of a cover plate, a coil spring, and a core head. The cover plate is disposed on the housing of the control component, and the coil spring is disposed inside the cover plate. The core head is connected to the center of the coil spring and is connected to the shaft extension.

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