CN202863203U - Active safety headrest device of automobile seat - Google Patents

Abstract

The utility model discloses an active safety headrest device for an automobile seat, which is composed of a headrest assembly (1), a linkage assembly (2) and a trigger assembly (3). The headrest assembly (1) includes the locking arm (7) and the ejector rod (10); the linkage assembly (2) includes the impact plate (12), the spring guide groove structural frame (13) and the lower part of the trigger lock 24; the trigger The assembly (3) includes a pressure plate (16), two pressure plate guide rods (17) with the same structure, a wedge (18), an upper plate of the trigger assembly frame (19) and a lower plate of the trigger assembly frame (20) . The linkage assembly (2) is located directly below the headrest assembly (1), that is, the linkage assembly (2) is located 0 to 5 mm directly below the two ejector rods (10) in the headrest assembly (1). The trigger assembly (3) is located under the linkage assembly (2), and the lower plate (20) of the trigger assembly frame in the trigger assembly (3) is engaged with the lower part of the trigger lock (24) in the linkage assembly (2) .

Description

Active Safety Headrest Device for Car Seats

technical field

The utility model relates to a headrest device used on a car seat, more precisely, the utility model relates to an active safety headrest device used on a front row seat of a car, and the headrest device is used in a rear-end collision of a vehicle. During a collision, it can move forward and upward relative to the seat assembly, so as to support the head and neck of the occupant before the head and neck shake violently, so as to better protect the safety of the occupant's head and neck.

Background technique

The car seat headrest is a device set up to improve the comfort of the occupant when riding and ensure the safety of the occupant when riding. In addition to adding comfort to the occupants, the main function of the car seat headrest is to provide the occupants with a head support and a rearward limit protection function. The neck protection is mainly based on the seat, that is, the rearward movement of the head relative to the upper torso during a rear-end collision is limited by the seat system-the backrest and the headrest to protect the neck.

When a car collides, especially a rear-end collision, the occupant's upper body moves quickly to the seat back, and the occupant's head quickly moves to the headrest thereupon. At this time, since there is a difference between the amount of movement of the occupant's upper body and the amount of movement of the occupant's head, the part where injury occurs most frequently is the cervical spine even at low speeds. Although the cause and location of the injury are still difficult to determine, most medical researches believe that the key factor of cervical spine injury is caused by the violent shaking of the head relative to the body in a rear collision.

At present, the active head restraint is the most common, direct and effective way to reduce the risk of neck injury. It can reduce the distance between the head restraint and the occupant's head within tens of milliseconds after the rear-end collision, thereby reducing the neck injury risk. risk of injury.

Contents of the invention

The technical problem to be solved by the utility model is to overcome the problems existing in the prior art and provide an active safety headrest device for a car seat.

In order to solve the above-mentioned technical problems, the utility model is realized by adopting the following technical scheme: the active safety head restraint device of the automobile seat is composed of a head restraint assembly, a linkage assembly and a trigger assembly.

The headrest assembly includes a movable panel of the headrest, a fixed panel of the headrest, 4 rocker arms with the same structure, a locking arm, the lower part of the headrest lock, 2 upper pressure springs with the same structure, and 2 springs with the same structure. Ejector bar, two headrest brackets with the same structure, limit plate and the upper part of the headrest lock.

The 4 corners of the movable panel of the headrest and the 4 corners of the fixed panel of the headrest are connected by 4 rockers with the same structure and bolts to rotate, and one end of the two upper compression springs with the same structure is fixed to the lower end of the headrest fixed plate. The left end faces of the two upper compression springs with the same structure are in contact with the lower ends of the movable panel of the headrest, and the back of the fixed panel of the headrest is welded and connected with the left end faces of the two transverse tubes in the two headrest brackets with the same structure. The same ejector rod is inserted into the two vertical pipes of the two headrest brackets with the same structure, and the upper ends of the two ejector rods with the same structure are welded to the right end of the upper part of the headrest lock inserted into the rectangular through hole in the middle of the headrest fixing plate Connection, the locking arm is welded on the right end of the top surface of the two rocking arms at the upper end, and the limit plate is fixed on the headrest fixing plate on the right side of the locking arm.

The movable panel of the headrest and the fixed panel of the headrest described in the technical proposal are all metal plate structural parts, and the four corners of the movable panel of the headrest and the fixed panel of the headrest are turned inside out by flanging technology, which is the same as that of the rocker. The arm is bolted to the lifting lug, the movable panel of the headrest is turned out of the lower end of the side of the lifting lug, that is, two identical rectangular upper compression spring guide grooves are evenly distributed between the lower two lifting lugs, and two upper compression springs The lower part of the headrest lock is welded and fixed on the headrest movable panel between the top of the guide groove and the upper two lifting lugs, and the middle position of the headrest fixed panel is provided with a rectangular through hole for installing the upper part of the headrest lock, and the headrest is fixed The lower end of the panel is provided with two bolt through holes with the same structure for installing two upper compression springs with the same structure.

The headrest assembly described in the technical solution or the headrest assembly is provided with a linkage assembly at 0 to 40 mm directly below the two push rods with the same structure. The linkage assembly includes a strike plate, a spring guide groove structural frame, a strike lock connecting plate, two lower compression springs with the same structure, and a flat plate fixed to the lower part of the trigger lock and the two lower compression springs with the same structure. The bottom surface of both ends of the impact plate installed in the structural frame of the spring guide groove is welded to the top surface of the lower compression spring, and the lower ends of the two lower compression springs with the same structure are respectively fixed by the lower compression spring and screwed to the spring. The two ends of the frame bottom plate in the guide groove structure frame, the upper end surface of the impact lock connecting plate is welded and connected with the impact plate, and the lower end of the impact lock connecting plate is welded and connected with the lower end surface of the T-shaped trigger lock.

The spring guide groove structural frame described in the technical solution is welded by a frame front plate, a frame rear plate, a frame bottom plate and two frame side plates with the same structure. The front panel of the frame and the rear panel of the frame are plate structural parts hollowed out in the middle. Process gaps are processed at the left and right ends to facilitate welding with the side panels of the same structure placed on both sides respectively. The bottom plate of the frame is rectangular with a Install the plate structure that hits the notch of the locking connection plate, the upper end of the side plate of the frame is a rectangular plate structure, and the lower end is an inclined plate provided with a wedge-shaped groove.

The lower end of the linkage assembly described in the technical solution is provided with a trigger assembly. The trigger assembly includes a pressure plate, two pressure plate guide rods with the same structure, a wedge rod, an upper plate of the trigger assembly frame and a lower plate of the trigger assembly frame. The middle part of the two parallel pressure plate guide rods with the same structure is connected with the right end surface of the pressure plate by welding, and the left end surface of the upper plate of the trigger assembly frame is welded with the pressure plate guide rod on the right end surface of the pressure plate Connection, the right end face of the upper plate of the trigger assembly frame is connected with the left end face of the vertical plate in the lower plate of the trigger assembly frame by welding, and the wedge bar is fixed on the surface of the right end of the upper plate of the trigger assembly frame by welding.

The lower plate of the trigger assembly frame described in the technical solution is a shell-like structural member that is connected end to end with four flat plates in sequence. The first flat plate is in a horizontal state, and the second flat plate and the A flat plate becomes 30 to 60 degrees, the third flat plate is perpendicular to the first flat plate, and the fourth flat plate is perpendicular to the third flat plate. There is a rectangular through hole in the middle of the first plate and the second plate that make up the lower plate of the trigger assembly frame, and the middle position of the third plate and the fourth plate on the right end of the trigger assembly frame is provided with a linkage assembly The lower part of the trigger catch snaps together the upper part of the trigger catch.

The two pressure plate guide rods with the same structure described in the technical solution use a straight rod structure with a rectangular or square cross-section in the middle part, and the two ends of the two pressure plate guide rods with the same structure are provided with rightward The protruding cuboid used to be placed in the chute on the left side of the seat frame and the right side of the seat frame in the original seat frame.

The wedge-shaped block rod described in the technical proposal is a straight rod structure with a rectangular or square cross section in the middle part, and the two ends of the wedge-shaped block rod are equipped with wedge-shaped grooves on the spring guide groove structural frame in the linkage assembly. wedges.

Compared with the prior art, the beneficial effects of the utility model are:

1. Regulation verification of head restraint devices

The national mandatory standard GB 15083-2006 "Car Seats, Seat Fixtures and Headrest Strength Requirements and Test Methods" proposes the height of the headrest: measure the length from the top of the headrest to the R point parallel to the trunk reference line, The highest position of the front seat shall not be less than 800mm, and the highest position of other seats shall not be less than 750mm. The active safety headrest device of the car seat described in the utility model is developed and designed based on the front seat frame of a certain car. In the design, the fixing method, position and third gear adjustment of the original seat headrest bracket are maintained function. The highest position of the original seat headrest is greater than 800 mm, and the active safety headrest device of the automobile seat described in the utility model also meets the requirements of laws and regulations.

2. Verification of the protective function of the active safety headrest device of the car seat

Neck injury criterion NIC is currently the most widely used neck injury evaluation index, and it is also the most convincing evaluation index for researchers. Simulation tests and other verifications have fully demonstrated its accuracy in evaluating neck injuries. Usually, researchers use the maximum value of NIC in the first 150 ms after a rear-end collision, NICmax, to evaluate the degree of neck injury.

Referring to Figure 2, most of the neck injuries occurred when the speed change was in the range of 10km/h to 20km/h, corresponding to a deceleration of about 5g. A deceleration of less than 2.5g usually does not cause injury. Therefore, the selected rear-end collision acceleration curve is shown in the figure. The speed change is 18km/h, the acceleration peak value is 9.0g, and the duration is 90ms. This curve meets the C-NCAP low-speed rear collision neck protection test of my country's automobile evaluation regulations. Dynamic test interval requirements.

Referring to Fig. 3, it is the comparison of the NIC values of the original headrest and the active safety headrest through the simulation analysis of the automobile rear-end collision test. The NIC response curve of the chair active safety headrest device, the abscissa is the time, the unit is ms, and the ordinate is the neck injury criterion NIC, the unit is m ² /s ² . It can be seen that under the headrest of the original car seat, the maximum value of the occupant's neck injury criterion NIC is 17.5m ² /s ² . When the headrest device is fully deployed, the neck injury criterion NIC is reduced to 12m ² /s ² . The value of NICmax is reduced by about 30%, that is, in the process of rear-end collision, the active safety headrest device of the car seat can reduce the occupant's neck injury by 30%.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is the axonometric projection drawing of the structural composition of the active safety headrest device of the automobile seat described in the utility model;

Fig. 2 is the acceleration curve diagram loaded in the verification effectiveness experiment of the active safety headrest device structure of the automobile seat described in the utility model;

Fig. 3 is a comparison curve of NIC values in a rear-end collision between the original headrest and the active safety headrest device for a car seat according to the present invention;

Fig. 4-a is an axonometric projection view of the structure of the headrest assembly in the active safety headrest device for a car seat according to the present invention;

Figure 4-b is the headrest assembly in the active safety headrest device of the car seat described in the utility model, after removing two ejector rods with the same structure and two headrest brackets with the same structure, the panel is fixed relative to the headrest Axonometric projection of

Fig. 5 is an axonometric projection diagram of the movable panel of the headrest and the rocker arm in the active safety headrest device of the automobile seat described in the present invention connected by bolts;

Fig. 6 is the axonometric projection of the upper compression spring guide groove, the lower part of the headrest lock buckle and the four lifting lugs with the same structure provided on one side of the movable panel of the headrest in the active safety headrest device of the automobile seat according to the utility model picture;

Fig. 7-a is an exploded axonometric view of the active safety headrest device for a car seat according to the present invention, where the upper compression spring is used to fix the flat plate, and bolts and nuts are used to connect the upper compression spring to the left side of the headrest fixing panel. projection;

Fig. 7-b is an axonometric projection view of the upper compression spring used to fix the flat plate in the active safety headrest device of the car seat described in the present invention, and bolts and nuts connecting the upper compression spring and the left side of the headrest fixing panel ;

Fig. 8 is an axonometric projection view of the structure of the linkage assembly in the active safety headrest device of the automobile seat described in the present invention;

Fig. 9 is an exploded axonometric projection diagram of the frame structure of the spring guide groove structure in the linkage assembly in the active safety headrest device of the automobile seat described in the present invention;

Fig. 10 is an exploded axonometric projection diagram of the relationship between the impact plate, the impact lock connecting plate, and the lower part of the trigger lock in the linkage assembly of the active safety headrest device for a car seat according to the present invention;

Fig. 11 is an axonometric projection view of the lower compression spring in the linkage assembly of the active safety headrest device for a car seat described in the present invention, using the lower compression spring to fix the flat plate on the frame bottom plate;

Fig. 12 is an axonometric projection view of the structure of the trigger assembly in the active safety headrest device for a car seat according to the present invention;

Fig. 13 is an exploded axonometric projection diagram of the structure of the trigger assembly in the active safety head restraint device of the automobile seat described in the present invention;

Fig. 14 is an axonometric projection view of the connection relationship between the trigger assembly and the linkage assembly, that is, the connection relationship between the wedge bar and the frame side plate in the active safety headrest device for a car seat according to the present invention;

Fig. 15 is a pressure-displacement curve diagram of the wedge-shaped block in the active safety head restraint device of the automobile seat described in the present invention;

Fig. 16-a is an axonometric projection view of the active safety headrest device of a car seat according to the present invention in its initial state;

Fig. 16-b is an axonometric projection view of the active safety headrest device of a car seat in a transition state according to the present invention;

Fig. 16-c is an axonometric projection view of the active safety headrest device of a car seat described in the present invention in its final state, that is, in its working state;

Fig. 17 is an axonometric projection view of the structural composition of the active safety headrest device of the automobile seat on the seat back frame according to the utility model;

Fig. 18 is an axonometric projection view of the assembly relationship between the active safety headrest device of a car seat and the seat back frame according to the present invention;

In the figure: 1. Headrest assembly, 2. Linkage assembly, 3. Trigger assembly, 4. Headrest movable panel, 5. Headrest fixed panel, 6. Rocker arm, 7. Locking arm, 8. Head The lower part of the pillow lock, 9. The upper compression spring, 10. The ejector rod, 11. The headrest bracket, 12. The impact plate, 13. The structural frame of the spring guide groove, 14. The impact lock connection plate, 15. The lower compression spring, 16 .Pressure plate, 17. Pressure plate guide rod, 18. Wedge block rod, 19. Trigger assembly frame upper plate, 20. Trigger assembly frame lower plate, 21. Trigger lock upper part, 22. Limit plate, 23. Head The upper part of the pillow lock, 24. The lower part of the trigger lock, 25. The guide groove of the upper pressure spring, 26. The front plate of the frame, 27. The rear plate of the frame, 28. The bottom plate of the frame, 29. The side plate of the frame, 30. The upper pressure spring is fixed Type plate, 31. Wedge groove, 32. Lifting lug, 33. Bolt, 34. Lower compression spring fixed flat plate, 35. Guide groove on pressure plate, 36. Lower guide groove on pressure plate, 37. Structural frame of spring guide groove Fixed plate, 38. seat frame side panel, 39. headrest plastic sleeve, 40. headrest metal sleeve, 41. round pipe support.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail:

Referring to FIG. 1 , the utility model provides an active safety headrest device for a car seat, which is composed of a headrest assembly 1 , a linkage assembly 2 and a trigger assembly 3 .

Referring to Figure 4-a and Figure 4-b, the headrest assembly 1 includes a headrest movable panel 4, a headrest fixed panel 5, four rocker arms 6 with the same structure, a locking arm 7, and a headrest lock Lower part 8, 2 upper compression springs 9 with the same structure, 2 push rods 10 with the same structure, 2 headrest brackets 11 with the same structure, limit plate 22, upper part of the headrest lock 23, upper compression spring guide rails 25, 2 An upper clip spring with the same structure fixes a straight plate 30, four lugs 32 with the same structure and bolts 33 with 8 structures.

Referring to Fig. 4 to Fig. 6, the four rocker arms 6 of the same structure are elongated plate-like structural members, and the two ends of the rocker arms 6 are provided with bolt through holes for mounting bolts 33, and the two ends of the rocker arms 6 are cylindrical surfaces.

Both the movable headrest panel 4 and the fixed headrest panel 5 are made of 3mm thick metal plate, and the material is Q235. The lifting lug 32 that is bolted to the rocker arm 6, the headrest movable panel 4 turns out the lower end of one side of four identical lifting lugs 32, more precisely, two identical lifting lugs are evenly distributed between the two lower lifting lugs 32. 1mm deep rectangular upper clip spring guide groove 25, the top of 2 upper clip spring guide grooves 25 and the headrest movable panel 4 between the two lifting lugs 32 above are welded and fixed with the headrest lock buckle bottom 8.

During normal driving, the upward protrusion on the lower part 8 of the headrest lock and the downward protrusion on the upper part 23 of the headrest lock fixed on the push rod 10 are hooked together to realize initial locking. When a rear-end collision occurs, the lower part 8 of the headrest latch on the headrest movable panel 4 is separated from the upper part 23 of the headrest latch moving upward, and the headrest movable panel 4 is completed under the action of the upper compression spring 9 . Forward and upward movement.

Referring to Fig. 7, the four lugs 32 on the movable panel 4 of the headrest are connected with the four lugs 32 on the fixed panel 5 of the headrest through four bolts 33 with the same structure and four rocker arms 6 with the same structure, forming a Rotationally connected parallelogram structure. The bolt 33 is a bolt with non-full thread (that is, the outer end is the threaded part, and the inner end is the optical axis part), the specification is GB/T5782-2000, M5X16.5mm, and the bolt 33 ensures that the lifting lug 32 and the rocker arm 6 can surround the light Connection and fastening are achieved while the shaft part is rotating. The two upper compression springs 9 with the same structure respectively adopt the upper compression spring to fix the flat plate 30 and the bolts to fix between the two lifting lugs 32 at the lower end of the headrest fixing plate 5, and the left end faces of the two upper compression springs 9 with the same structure It is connected with the groove bottom surface of the upper stage clip spring guide groove 25 at the lower end of the headrest movable panel 4 . The two headrest brackets 11 with the same structure are composed of horizontal tubes and vertical tubes, and the two horizontal tubes in the two headrest brackets 11 with the same structure are perpendicular to the two vertical tubes in the headrest bracket 11 and connected by welding , the back of the headrest fixing panel 5 is welded to the left end faces of the two horizontal tubes in the two headrest brackets 11 with the same structure, and the two push rods 10 with the same structure are inserted into the two vertical tubes in the headrest bracket 11, The push rod 10 can move up and down in the vertical tube in the headrest support 11, which belongs to sliding fit. And the two vertical pipes in the headrest support 11 are inserted in the headrest plastic sleeve 39 on the original seat frame, and the lower ends of the two vertical pipes in the headrest support 11 have three grooves, which can be connected with the headrest cover plastic tube. The lock in 39 is locked to form three gear positions of the active safety headrest device of the car seat. The position always remains the same. The upper end of the push rod 10 is welded to the right end of the upper part 23 of the headrest lock inserted into the rectangular through hole in the middle part of the headrest fixing plate 5 . The locking arm 7 is welded to the right end of the top surface of the two rocker arms 6 at the upper end. When the active safety headrest device of the car seat is triggered, the movable panel 4 of the headrest moves forward and upward under the drive of the two upper compression springs 9 To be in contact with the limiting plate 22 on the headrest fixing panel 5 fixed between the two lifting lugs 32 at the upper end, to limit the rotation angle of the rocker arm 6 (the rocker arm 6 is perpendicular to the headrest fixing plate 5) so as to control the movement of the headrest The final position of panel 4. The middle position of the headrest fixing plate 5 is provided with a rectangular through hole, so that the upper part 23 of the headrest lock can move up and down in the rectangular through hole, and the upper part 23 of the headrest lock and the lower part 8 of the headrest lock can be fastened or disengaged. The lower end of the headrest fixing panel 5 is provided with two structurally identical bolt through holes for installing two structurally identical upper compression springs 9 , and the rotation axes of the two structurally identical bolt through holes are respectively connected to those on the headrest movable panel 4 . The symmetrical planes of the two rectangular upper stage clip guide grooves 25 are coplanar.

Referring to Fig. 8, the linkage assembly 2 includes a strike plate 12, a spring guide groove structural frame 13, a strike lock connecting plate 14, two lower pressure springs 15 with the same structure, and a lower part 24 of the trigger lock with the same structure as the two lower pressure springs. Spring fixes the straight plate 34.

Referring to Fig. 9, the described spring guide groove structure frame 13 is welded by 5 shaped plates whose material is Q235. The five shaped plates are respectively a frame front plate 26 with a thickness of 1 mm, a frame rear plate 27 with a thickness of 1 mm, a frame bottom plate 28 with a thickness of 2 mm, and two frame side plates 29 with the same structure and a thickness of 3 mm. The spring guide groove structure frame 13 provides guiding effect for the lower compression spring 15 and the striking plate 12 . The middle of the frame front plate 26 and the frame rear plate 27 is a hollow structure, the purpose is to reduce the quality, and the left and right ends are processed with process gaps, which are convenient to be welded with the same frame side plates 29 of the same structure respectively placed on both sides. The frame bottom plate 28 is a rectangular plate structure with a gap in the middle, and the gap in the middle provides a space for the impact lock connecting plate 14 to be placed. The upper end of the frame side plate 29 is a rectangular plate structure, and its rear end is an inclined plate structure provided with a wedge-shaped groove 31 .

Referring to FIG. 10 , the two ends of the strike plate 12 are cylindrical surfaces, and the bottom surfaces of the two ends of the strike plate 12 are welded to the top surface of the lower compression spring 15 . The upper end surface of the impact lock connecting plate 14 is welded to the impact plate 12, and the lower end of the impact lock connecting plate 14 is welded to an end surface of the lower part 24 of the T-shaped trigger lock. During normal driving, the lower part 24 of the trigger lock and the upper part 21 of the trigger lock in the trigger assembly 3 are buckled together to form a locked state; The lower part 24 of the trigger lock is disengaged, the compressed lower stage clip 15 releases the stored energy, and the impact plate 12 moves upwards so as to impact and push the push rod 10 to move upwards.

Referring to Fig. 11, the lower ends of two lower compression springs 15 with the same structure are respectively fixed on the two ends of the frame bottom plate 28 with lower compression springs to fix the flat plate 34 and screws, but due to the limited space of the spring guide groove structure frame 13, The connection between the upper end of the lower compression spring 15 and the two ends of the impact plate 12 has given up the fastening mode of the bolt connection, and replaced it by adopting a welding method to fix the two.

Referring to Figure 12 and Figure 13, the trigger assembly 3 includes a pressure plate 16, two pressure plate guide rods 17 with the same structure, a wedge rod 18, an upper plate 19 of the trigger assembly frame and a lower plate 20 of the trigger assembly frame .

The two pressure plate guide rods 17 with the same structure are straight rod-type structural members with a rectangular or square cross section in the middle part, and both ends of the two pressure plate guide rods 17 with the same structure are provided with cuboids protruding to the same side , the left end surface of the middle part is connected with the right end surface of the pressure plate 16 by welding, two pressure plate guide rods 17 with the same structure are arranged symmetrically up and down on the right end surface of the pressure plate 16, and the cuboids at both ends face the same direction to the right Side, the cuboid at both ends is used to be placed in the chute provided on the seat frame left wing plate 38 and the seat frame right side wing plate in the original seat frame, which can limit the horizontal movement of the pressure plate 16. The left end surface of the upper plate 19 of the trigger assembly frame is connected with the right end surface of the pressure plate guide rod 17 on the upper right end surface of the pressure plate 16 by welding, and the right end surface of the upper plate 19 of the trigger assembly frame is connected with the lower plate 20 of the trigger assembly frame. The left end face of the vertical plate is connected by welding, the upper plate 19 of the trigger assembly frame is perpendicular to the pressure plate 16, and the middle of the upper plate 19 of the trigger assembly frame is a hollow structure, the purpose is to reduce the pressure on the upper plate 19 of the trigger assembly frame. quality. The lower plate 20 of the trigger assembly frame is formed by connecting four flat plates end to end in sequence. The right end face of the rod 17 is welded and connected to the pressure plate 16. The second flat plate forming the lower plate 20 of the assembly frame forms a certain angle (30 to 60 degrees) with the first flat plate, and the third open flat plate is perpendicular to the The first flat plate and the fourth open flat plate are perpendicular to the third flat plate, so the lower plate 20 of the trigger assembly frame is a shell-like structural member formed by folding a rectangular flat plate three times. The middle of the first flat plate and the second flat plate in the lower plate 20 of the trigger assembly frame is also a hollow structure, and the purpose is also to reduce the quality of the lower plate 20 of the trigger assembly frame. At the end (right end) of the lower plate 20 of the trigger assembly frame, that is, in the middle of the third and fourth plates, there is a rectangular gap structure that is buckled together with the lower part 24 of the trigger lock in the linkage assembly 2, that is, the trigger lock. Buckle the upper part 21. Wedge bar 18 adopts welding mode to be fixed on the surface of trigger assembly frame upper plate 19 right-hand sides, and wedge bar 18 adopts cross-section as the middle part and is the straight bar type structural part of rectangle or square, and the two sides of wedge bar (18) The end is provided with a wedge-shaped piece fitted with the wedge-shaped groove 31 on the spring guide groove structure frame 13 in the linkage assembly 2.

Referring to Fig. 14, the upper plate 19 of the trigger assembly frame moves backward, the wedge-shaped block rod 18 moves backward in the wedge-shaped groove 31 on the spring guide groove structure frame 13, and the resistance gradually increases with the increase of the displacement so as to avoid error trigger. The lower surface of the wedge-shaped groove 31 is a plane, and the upper surface forms an angle of 8 degrees with the horizontal direction. The gap between the wedge-shaped block 18 and the wedge-shaped groove 31 is for the consideration of processing and assembly. The wedge-shaped slots 31 are located on the frame side panels 29 and are located on two sides, one on each side. When the occupant's shoulder presses the pressure plate 16, the trigger assembly 3 moves backward as a whole, and the wedge block 18 also moves backward with it. However, due to the existence of the wedge groove 31, as the backward displacement gradually increases, the The resistance gradually increases, and the wedge block begins to be squeezed and deformed. The stress-displacement curve of the wedge block 18 is shown in FIG. 15 . The survey shows that the pressure of the shoulders on the backrest of the occupant is generally less than 300N in normal use of the vehicle; and when a rear-end collision occurs, the pressure of the shoulders on the backrest is about 1100N. The force simulation analysis of the wedge rod 18 and the wedge groove 31 shows that when the pressure is less than 400N, the wedge 18 basically does not move; when the pressure is greater than 400N, the wedge 18 begins to move relatively in the wedge groove 31; When the pressure reaches 800N, the relative displacement reaches 4mm, and the upper part 21 of the trigger lock in the trigger assembly 3 also moves backward 4mm, which happens to be separated from the lower part 24 of the trigger lock to achieve the triggering effect; when the pressure is greater than 800N, the relative displacement increases. Large, but up to 5mm, and relatively short trigger time.

Referring to Fig. 16, it is a flow chart of the movement of the new type of active safety head restraint device for automobile seats. When a rear-end collision occurs in the automobile, the occupant, under the action of inertia, presses the pressure plate 16 with the shoulder, driving the lower plate 20 of the trigger assembly frame. After the movement, the upper part 21 of the trigger lock is disengaged from the lower part 24 of the trigger lock, and the impact plate 12 moves upward under the drive of the lower compression spring 15. In 1, the height difference of the ejector rod 10 can be increased by 20mm for each gear, and the height can be increased by 40mm at most, thus realizing the adjustable function of 3 gears. The impact plate 12 collides with the ejector rod 10 during the upward movement, and the ejector rod 10 is hit The collision of the plate 12 moves upwards, and then the upper part 23 of the headrest lock is disengaged from the lower part 8 of the headrest lock, and the movable panel 4 of the headrest is driven by the rocker arm 6 under the action of the upper compression spring 9 to complete the forward and upward movement. During the rotation of the rocker arm 6, since the locking arm 7 on the rocker arm 6 and the limiting plate 22 on the headrest fixing panel 5 are in contact with each other, the rotation angle of the rocker arm 6 is limited, and the headrest remains in a fixed position as a whole , at this moment, the movable panel 4 of the headrest has moved 40mm forward and moved up 30mm.

Referring to Fig. 17, it shows the car seat back frame to be installed in the car seat active safety head restraint device. The car seat back frame includes two spring guide groove structural frame fixing plates 37 with the same structure, the seat frame left side wing plate 38 provided with the guide groove 35 on the pressure plate and the lower guide groove 36 on the pressure plate, and the left wing plate 38 provided with the pressure plate Guide groove 35 and the seat frame right side flange of the lower guide groove 36 of the pressure plate, 2 headrest plastic sleeves 39 with the same structure, 2 headrest metal sleeves 40 with the same structure and a round pipe bracket 41, wherein, The left wing plate 38 of the seat frame and the right wing plate of the seat frame are symmetrical sheet metal structural parts. The two guide grooves 35 on the pressure plate with the same structure are symmetrically arranged on the left wing plate 38 of the seat frame and the top of the right wing plate of the seat frame, and the two lower guide grooves 36 on the pressure plate with the same structure are symmetrically arranged on the two Below the guide groove 35 on the pressure plate with the same structure, the two ends of the two pressure plate guide rods 17 with the same structure in the trigger assembly 3 are respectively placed on the seat frame left wing plate 38 on both sides of the seat back frame and The guide groove 35 on the pressure plate on the seat frame right wing and the lower guide groove 36 on the pressure plate. The pressure plate guide rod 17 can have a relative displacement of 5 mm in the guide groove 35 on the pressure plate and the lower guide groove 36 on the pressure plate. One end of two spring guide slot structure frame fixing plates 37 arranged symmetrically along the longitudinal center line of the seat frame is respectively welded on the end faces of the left side wing plate 38 of the seat frame and the end face of the right side wing plate of the seat frame, and the other end is welded on the spring guide. on the frame rear plate 27 in the groove structure frame 13 . Circular pipe support 41 is welded on the inboard of the chair frame left wing plate 38 and the seat frame right side wing plate top that are placed vertically, and places the front side of spring guide groove structure frame fixing plate 37. Two headrest metal sleeves 40 with the same structure are evenly distributed on the beam in the round tube bracket 41 by welding, and two headrest plastic sleeves 39 with the same structure are put into two headrest metal sleeves with the same structure 40 for tight junctions.

Refer to Fig. 18, which shows the connection relationship between the active safety head restraint device of the car seat and the seat back frame. The headrest plastic sleeve 39 and the headrest metal sleeve 40 are inherent parts in the original automobile seat back frame. The headrest support 11 is inserted into the headrest plastic sleeve 39. The lower end of the headrest support 11 has three grooves, which can It is locked with the buckle in the headrest cover plastic tube 39 to form three gears of the active safety headrest device of the car seat. When the active safety headrest device of the car seat is in the highest and intermediate gears, the ejector rod 10 is in a suspended state and does not contact the impact plate 12. After the trigger assembly 3 is triggered, the lower compression spring 15 will first make up for the impact plate 12 And the gap between the push rod 10 acts on the bottom surface of the push rod 10 again. When the active safety headrest device of the car seat is in the lowest gear, the bottom surface of the ejector rod 10 is in contact with the upper surface of the impact plate 12, and after the trigger assembly 3 is triggered, the restoring force of the compressed lower compression spring 15 fully acts on the bottom surface of the mandrel 10.

The working principle of the active safety headrest device of the car seat:

When a rear-end collision occurs in the car, the occupant's shoulders squeeze the pressure plate 16, and the trigger assembly 3 moves backward as a whole with the movement track of the pressure plate guide rod 17, and then the upper part 21 of the trigger lock and the lower part 24 of the trigger lock are disengaged. The impact plate 12 moves upward along the spring guide groove structural frame 13 under the drive of the compressed lower clip spring 15, and the upwardly moving impact plate 12 hits the push rod 10, so that the push rod 10 continues to move upward in the headrest bracket 11, The lower part 8 of the headrest lock and the upper part 23 of the headrest lock are also disengaged during the upward movement of the push rod 10, and the movable panel 4 of the headrest drives the rocker arm 6 to rotate forward and upward under the action of the upper compression spring 9 to complete the four-link The rod mechanism moves, and the locking arm 7 on the rocker arm 6 is in contact with the limiting plate 22 on the fixed panel 5 of the headrest, thereby limiting the swing angle of the rocker arm 6 and determining the final position of the movable panel 4 of the headrest. In this way, the head of the occupant can contact the movable panel 4 of the headrest as early as possible, reducing the amount of movement between the occupant's head relative to the occupant's chest, and effectively reducing the risk of neck injury. At the same time, the shoulder trigger and wedge block structure are adopted to effectively prevent unnecessary false triggering and provide better protection for the occupants. The application of the spring makes the headrest assembly 1 guaranteed to be triggered between the three gears, because as the headrest assembly 1 changes between the three gears, the push rod 10 also moves vertically. Direction moves up and down, and in the initial state, there is a distance in the vertical direction between the impact plate 12 and the ejector rod 10, and this distance is the vertical movement of the headrest assembly 1 within the third gear, that is, The distance traveled when the upper stage clip 9 is driven makes up the height difference between the third gears, thereby realizing the adjustable function of the third gears.

The feature of the active safety headrest device for a car seat of the present invention is that when a rear-end collision occurs, the shoulder squeezes the pressure plate 16 and absorbs part of the energy, after which the movable panel 4 of the headrest moves upwards by 30mm and moves forward. The movement of 40mm allows the occupant's head to contact the headrest earlier, reducing the amount of movement between the occupant's head and the occupant's chest, reducing the risk of neck injury; at the same time, it is driven by a spring and has a shorter response time than other purely mechanical types The mechanism has been greatly improved; at the same time, the original headrest 3-speed adjustable function can be realized; the structure of the ejector rod 10 makes the headrest assembly 1 relatively independent and can be disassembled from the seat; the shoulder trigger and wedge The block structure avoids false triggering to a large extent; the structure is simple, the installation is convenient, the cost is minimized, and the safety of the occupant's neck is effectively protected.

Claims (8)

1. an active safe headrest device of automobile chair is characterized in that, described active safe headrest device of automobile chair includes headrest assembly (1);

Described headrest assembly (1) comprises headrest drop front (4), headrest fixed panel (5), 4 rocking arm (6), lockup arm (7), headrest snap close bottom (8), 2 top stage clip (9), 2 push rod (10), 2 headrest support (11), limit plates (22) and headrest snap close top (23) that structure is identical that structure is identical that structure is identical that structure is identical;

4 jiaos of places rocking arm (6) identical with 4 jiaos of place's 4 structures of employing of headrest fixed panel (5) of headrest drop front (4) is rotationally connected with bolt (33), one terminal bolt of the top stage clip (9) that two structures are identical is fixed on the lower end of headrest adapter plate (5), the left side of the top stage clip (9) that two structures are identical is connected with the lower end in contact of headrest drop front (4), 2 transverse tube left sides in the headrest support (11) identical with 2 structures of the back side of headrest fixed panel (5) are welded to connect, the push rod (10) that 2 structures are identical inserts in 2 vertical tubes in the identical headrest support (11) of 2 structures, the upper end of the push rod (10) that 2 structures are identical is welded to connect with the right-hand member that inserts the headrest snap close top (23) in the rectangular through-hole of headrest adapter plate (5) middle part, the right-hand member of the top end face of two rocking arms (6) on lockup arm (7) is welded on, limit plate (22) is fixed on the headrest adapter plate (5) on lockup arm (7) right side.

2. according to active safe headrest device of automobile chair claimed in claim 1, it is characterized in that, described headrest drop front (4) and headrest fixed panel (5) are all metal sheet class formation spare, all adopt flanging process to turn on one's side out inwards at the Si Jiaochu of headrest drop front (4) and the fixed panel (5) of resting the head on and identical carry out bolted hanger (32) with rocking arm (6), headrest drop front (4) is routed up the lower end of a side of hanger (32), the i.e. top stage clip guide groove (25) of uniform 2 identical rectangles between two hangers (32) below, article 2, be welded with headrest snap close bottom (8) on the headrest drop front (4) between the top of top stage clip guide groove (25) and top two hangers (32), the midway location of headrest fixed panel (5) is provided with the rectangular through-hole that headrest snap close top (23) is installed, and the lower end of headrest fixed panel (5) is provided with 2 bolt holes that structure is identical for the identical top stage clip (9) of 2 structures of installation.

3. according to active safe headrest device of automobile chair claimed in claim 1, it is characterized in that, described headrest assembly (1) rest the head in other words in the assembly (1) the identical push rod (10) of 2 structures under 0 to 40mm place be provided with interlock assembly (2);

Described interlock assembly (2) comprises crash panel (12), spring guide barrel construction framework (13), bump buckle connecting plate (14), bottom stage clip (15) that two structures are identical, trigger fixedly cross bar (34) of snap close bottom (24) the bottom stage clip identical with two structures;

Be installed in the top end face of the bottom surface at crash panel (12) two ends among the spring guide barrel construction framework (13) and bottom stage clip (15) for being welded to connect, the bottom stage clip is adopted respectively in the lower end of the bottom stage clip (15) that two structures are identical, and fixedly cross bar (34) and screw are fixed on the two ends of the chassis base (28) among the spring guide barrel construction framework (13), upper surface and the crash panel (12) of bump buckle connecting plate (14) are welded to connect, and the lower end of bump buckle connecting plate (14) is welded to connect with triggering snap close bottom (24) one end faces that become the T font.

4. according to active safe headrest device of automobile chair claimed in claim 3, it is characterized in that, described spring guide barrel construction framework (13) by framework header board (26), framework after plate (27), chassis base (28) the framework side plate (29) identical with two structures be welded;

Plate (27) is the plate structure spare of middle hollow out behind framework header board (26) and the framework, be processed with at two ends, the left and right sides and be convenient to the technique gap that the framework side plate (29) identical with the structure that places respectively both sides welds mutually, chassis base (28) is provided with the plate structure spare of the gap that bump buckle connecting plate (14) is installed for oblong and centre, framework side plate (29) upper end is Rectangular Plate Structure, and its lower end is for being provided with the oblique plate of webge slot (31).

5. according to active safe headrest device of automobile chair claimed in claim 3, it is characterized in that the lower end of described interlock assembly (2) is provided with triggers assembly (3);

Described triggering assembly (3) comprises pressure plate (16), two pressure plate guide rod (17), wedge bar (18), triggering assembly framework upper plates (19) and triggering assembly framework lower plate (20) that structure is identical;

The centre portion of the pressure plate guide rod (17) that is parallel to each other that two structures are identical adopts welding manner to be connected with the right side of pressure plate (16), triggering the left side of assembly framework upper plate (19) adopts welding manner to be connected with the pressure plate guide rod (17) that is in upper end, pressure plate (16) right side, the right side of triggering assembly framework upper plate (19) adopts welding manner to be connected with the left side of vertical plate in triggering assembly framework lower plate (20), and wedge bar (18) employing welding manner is fixed on the surface of triggering assembly framework upper plate (19) right-hand member.

6. according to active safe headrest device of automobile chair claimed in claim 5, it is characterized in that, described triggering assembly framework lower plate (20) is the Shell-Class framing member that is connected successively by four dull and stereotyped head and the tail, first flat board is in horizontality, second flat board that forms assembly framework lower plate (20) becomes 30 to 60 degree with first flat board, the 3rd opening plate is perpendicular to first flat board, the 4th opening plate is again perpendicular to the 3rd flat board, form to trigger first flat board of assembly framework lower plate (20) and be provided with rectangular through-hole in the middle of dull and stereotyped with second, trigger assembly framework lower plate (20) right-hand member be the 3rd midway location with the 4th flat board be provided with and the assembly that links (2) in the triggering snap close top (21) that snaps together, triggering snap close bottom (24).

7. according to active safe headrest device of automobile chair claimed in claim 5, it is characterized in that, the identical pressure plate guide rod (17) of described two structures is rectangle or foursquare straight-bar class formation spare for centre portion adopts cross-sectional plane, and the two ends of the pressure plate guide rod (17) that two structures are identical all are provided with being used for of protruding to the right and are placed on cuboid in the chute on original chair skeleton cushion frame left side wing plate (38) and the cushion frame right side wing plate.

8. according to active safe headrest device of automobile chair claimed in claim 5, it is characterized in that, described wedge bar (18) is rectangle or foursquare straight-bar class formation spare for centre portion adopts cross-sectional plane, the two ends of wedge bar (18) be provided with and the assembly that links (2) medi-spring guide barrel construction framework (13) on the equipped wedge of webge slot (31).

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