Integral flip-fold headrest

Abstract

This utility model discloses an integrally folding headrest, including a transmission mechanism housing, a transmission mechanism, and a rotating shaft. The transmission mechanism is disposed inside the seat back via the transmission mechanism housing. The transmission mechanism includes a drive motor, a worm gear mounted on the output shaft of the drive motor, and a worm wheel meshing with the worm gear. The worm wheel has a rotating shaft, and both ends of the rotating shaft extend out of the transmission mechanism housing and are connected to the headrest assembly. This utility model uses the rotating shaft to drive the headrest assembly to fold as a whole. Therefore, after the headrest is folded, the Z-axis space at the top of the seat back is larger, providing a wider forward viewing area and a more open field of vision for rear passengers. Furthermore, the transmission is smoother and quieter during the folding process.

Description

Technical Field

[0001] This utility model belongs to the field of automotive headrests, specifically relating to an integrally folding headrest. Background Technology

[0002] As consumers' demands for ride comfort and operating experience become more diverse, foldable headrests have been widely used in various types of cars due to their high convenience and space utilization. However, existing foldable headrests can only fold relative to the headrest rod when folded. Therefore, the Z-shaped space at the top of the seat back is relatively small after the headrest is folded, resulting in a narrower forward visibility area for rear passengers. Furthermore, the folding process is unstable and noisy. Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned problems by providing an integrally folding headrest. This folding headrest folds as a whole by rotating a shaft, thus increasing the Z-axis space at the top of the seat back after folding. This provides rear passengers with a wider field of vision and a more expansive view. Furthermore, the folding process is smoother and quieter.

[0004] To achieve the above objectives, this utility model provides an integral folding headrest, including a transmission mechanism housing, a transmission mechanism, and a rotating shaft. The transmission mechanism is disposed inside the seat back through the transmission mechanism housing. The transmission mechanism includes a drive motor, a worm gear disposed on the output shaft of the drive motor, and a worm wheel meshing with the worm gear. A rotating shaft is disposed on the worm wheel, and both ends of the rotating shaft pass through the transmission mechanism housing and are connected to the headrest assembly.

[0005] As a further optimization, the drive motor is laterally mounted inside the transmission mechanism housing. The output shaft of the drive motor has an external thread, and the middle part of the worm has an internal thread that mates with the external thread on the output shaft. The worm is connected to the output shaft of the drive motor by a screw connection.

[0006] As a further optimization, a rubber ring is fitted between the upper part of the worm gear and the transmission mechanism housing.

[0007] As a further optimization, the worm and worm wheel mesh to form a worm pair, and the helix angle of the worm pair is smaller than the equivalent friction angle, which can realize the self-locking of the transmission mechanism.

[0008] As a further optimization, the rotating shaft is a stepped shaft with a limiting platform in the middle. The limiting platform has an outwardly protruding limiting ridge, and the ends of the limiting platform have outwardly extending baffles. The worm gear has a connecting hole in the middle that conforms to the limiting platform. The connecting hole has an outwardly protruding limiting groove at the position relative to the limiting ridge. The worm gear is connected to the limiting platform of the rotating shaft through the connecting hole, and the axial rotation of the worm gear is limited by the cooperation of the limiting groove and the limiting ridge.

[0009] As a further optimization, a bushing and a first washer are fitted on the rotating shaft at the end of the limiting platform away from the baffle, and the bushing and the baffle clamp the worm gear inside the transmission mechanism housing.

[0010] As a further optimization, a sleeve is provided between the transmission mechanism housing and the rotating shaft.

[0011] As a further optimization, the two ends of the rotating shaft pass through the transmission mechanism housing and the headrest assembly in sequence, and are then fitted with a second gasket and fixed by a fastener.

[0012] As a further optimization, the transmission mechanism housing is divided into an upper shell and a lower shell. The lower shell has a lower motor mounting cavity, a lower worm gear mounting cavity, and a lower shaft mounting cavity connected to the lower worm gear mounting cavity. The lower motor mounting cavity has a heat dissipation vent and a lower wire harness clearance opening. The upper shell has an upper motor mounting cavity, a worm gear mounting cavity connected to the upper motor mounting cavity, a worm gear mounting cavity connected to the worm gear mounting cavity, and a upper shaft mounting cavity connected to the upper worm gear mounting cavity. A through hole is provided at the top of the upper worm gear mounting cavity, and a wire harness clearance opening is provided on one side of the upper motor mounting cavity.

[0013] As a further optimization, the worm gear is a semi-tooth worm gear.

[0014] Advantages and beneficial effects of this utility model

[0015] 1. The transmission mechanism in this utility model is set inside the seat back. When driven by the transmission mechanism, the headrest assembly consisting of the headrest, headrest rod, headrest guide sleeve and metal sleeve can be folded at a large angle through the rotating shaft. Compared with the traditional folding headrest, it increases the Z-direction space at the top of the seat back, making the viewing area of ​​the rear passengers wider and the field of vision more open.

[0016] 2. The transmission mechanism of this utility model uses a drive motor as a power source. A worm gear pair, consisting of a worm and a worm wheel, transmits the torque output by the drive motor. This design reduces the output speed of the drive motor, increases the transmission ratio, and achieves the transmission of large torque, making it easier to fold and adjust the headrest. On the other hand, the worm gear transmission is equivalent to a helical transmission, which is a multi-tooth meshing transmission, resulting in smoother transmission and lower noise. Finally, the worm gear pair has self-locking properties, eliminating the need for an additional angle limiting structure, which allows the headrest to be stably maintained in the current driving position.

[0017] 3. The worm gear in this utility model is preferably a semi-tooth worm gear. The semi-tooth worm gear can reduce weight, reduce the inertial load of the transmission mechanism, improve the response speed, and avoid unnecessary slight friction between the non-meshing teeth of the full-tooth worm gear and the worm, while meeting the rotation range of the headrest assembly. This reduces additional friction loss and noise. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the folding mechanism provided in this embodiment of the present invention after the top cover has been removed;

[0020] Figure 2 This is a cross-sectional view of the folding mechanism provided in this embodiment of the present invention installed inside the seat back;

[0021] Figure 3 This is a schematic diagram of the transmission mechanism and the rotating shaft provided in this embodiment of the utility model;

[0022] Figure 4 This is an exploded view of the rotating shaft, worm gear, bushing, and gasket provided in this embodiment of the utility model;

[0023] Figure 5 This is a schematic diagram of the transmission mechanism housing provided in an embodiment of the present utility model;

[0024] Figure 6 This is an exploded view of the headrest assembly provided in this embodiment of the utility model;

[0025] Figure 7 This is an embodiment of the present utility model. Figure 1 Enlarged view of point A in the middle.

[0026] Reference numerals: Transmission mechanism housing 1, upper shell 101, motor upper mounting cavity 1011, worm gear mounting cavity 1012, worm wheel upper mounting cavity 1013, rotating shaft upper mounting cavity 1014, through hole 1015, lower shell 102, motor lower mounting cavity 1021, heat dissipation port 10211, wire harness clearance port 10212, worm wheel lower mounting cavity 1022, rotating shaft lower mounting cavity 1023, transmission mechanism 2, drive motor 21, worm 22, worm wheel 23, connecting hole 231, limiting groove 232, rotating shaft 3, limiting platform 31, limiting ridge 32, baffle 33, headrest assembly 4, headrest 41, headrest rod 42, headrest guide sleeve 43, metal sleeve 44, rubber ring 5, bushing 6, first gasket 7, sleeve 8, second gasket 9, fastener 10, seat back 11 and backrest frame 12. Detailed Implementation

[0027] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein.

[0028] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] like Figure 1 and Figure 2 As shown, the overall folding headrest includes a transmission mechanism housing 1, a transmission mechanism 2, and a rotating shaft 3. The transmission mechanism housing 1 is connected to the backrest frame 12 inside the seat back 11 by bolts and nuts. To facilitate the placement of the transmission mechanism 2 inside the transmission mechanism housing 1, this embodiment divides the transmission mechanism housing 1 into an upper shell 101 and a lower shell 102. See [reference needed]. Figure 5The upper shell 101 has a motor mounting cavity 1011, a worm mounting cavity 1012 connected to the motor mounting cavity 1011, a worm wheel mounting cavity 1013 connected to the worm mounting cavity 1012, and a shaft mounting cavity 1014 connected to the worm wheel mounting cavity 1013. A through hole 1015 is provided on the top of the worm mounting cavity 1012, and a wire harness clearance opening is provided on one side of the motor mounting cavity 1011. The lower shell 102 has a motor lower mounting cavity 1021, a worm gear lower mounting cavity 1022, and a shaft lower mounting cavity 1023 connected to the worm gear lower mounting cavity 1022. The motor lower mounting cavity 1021 has a heat dissipation vent 10211 and a wiring harness lower clearance vent 10212. The transmission mechanism housing 1 is screwed to the backrest frame 12 through the lower shell 102. The upper shell 101 and the lower shell 102 are connected by screwing, thereby enclosing the transmission mechanism 2.

[0030] like Figure 1 As shown, the transmission mechanism 2 includes a drive motor 21, a worm gear 22 mounted on the output shaft of the drive motor 21, and a worm wheel 23 meshing with the worm gear 22. The drive motor 21 is fixed in the transmission mechanism housing 1 through the lower motor mounting cavity 1021 and the upper motor mounting cavity 1011. The wiring harness of the drive motor passes through the lower wiring harness clearance port 10212 and the upper wiring harness clearance port and exits the transmission mechanism housing 1, connecting to the seat wiring harness or the vehicle wiring harness. One end of the worm 22 is connected to the output shaft of the drive motor 21, and the other end is placed in the worm mounting cavity 1012 on the upper shell 101, with its top end inserted into the through hole 1015. To prevent the upper end of the helical teeth of the worm 22 from directly contacting the top inner wall of the worm mounting cavity 1012, a rubber ring 5 is fitted on the upper end of the helical teeth of the worm 22 in this embodiment, so that the helical teeth of the worm 22 are isolated from the worm mounting cavity 1012. The rubber ring 5 can prevent the vibration and impact generated by the meshing transmission from being directly transmitted to the upper shell 101, thereby causing resonance of the transmission mechanism housing 1 and generating noise. In addition, the elastic deformation of the rubber ring 5 can absorb some of the vibration energy, playing a role in buffering and reducing vibration transmission, thereby reducing operating noise. The worm gear 23 meshes with the worm 22 and is placed between the upper mounting cavity 1013 and the lower mounting cavity 1022 of the worm gear. The rotating shaft 3 connected to the worm gear 23 is placed between the upper mounting cavity 1014 and the lower mounting cavity 1023 of the rotating shaft. Both ends of the rotating shaft 3 pass through the transmission mechanism housing 1 and are connected to the headrest assembly 4.

[0031] As a further optimization, the drive motor 21 is laterally positioned between the lower motor mounting cavity 1021 and the upper motor mounting cavity 1011, and the output shaft is connected to the worm gear 22 by a thread. The threaded connection can effectively resist the axial and radial forces generated during transmission and reduce the risk of loosening of the connection.

[0032] like Figure 3 As shown, the worm 22 and worm wheel 23 mesh to form a worm pair. The helix angle of the worm pair is less than the equivalent friction angle. The worm pair is used to transmit power between the drive motor 21 and the rotating shaft 3. On the one hand, it can reduce the output speed of the drive motor 21 and increase the transmission ratio while using a smaller drive motor 21, so as to achieve the transmission of large torque. It also prevents the power of the drive motor 21 from being directly transmitted to the rotating shaft 3. If the drive motor 21 directly drives the rotating shaft 3, the large torque drive motor 21 will be too large. On the other hand, the small torque drive motor 21 may cause the headrest assembly 4 to jam during the folding process due to insufficient torque. On the other hand, the meshing of the worm gear 23 and the worm 22 is a helical surface contact, which has a large contact area and small impact, making the transmission process smoother and quieter. This prevents the speed fluctuation of the drive motor 21 from being directly transmitted to the headrest assembly 4, which would cause the headrest assembly 4 to be unstable and noisy during the folding process. Finally, the worm gear pair has self-locking properties, so there is no need to set an additional angle limiting structure, which can keep the headrest assembly 4 stably in the current driving position.

[0033] like Figure 1 , Figure 3 and Figure 4 As shown, the rotating shaft 3 is a stepped shaft with a square limiting platform 31 in the middle. The limiting platform 31 has an outwardly protruding limiting ridge 32. The left end of the limiting platform 31 has outwardly extending baffles 33 around its perimeter. The worm gear 23 has a connecting hole 231 in the middle that conforms to the limiting platform 31. The connecting hole 231 has an outwardly protruding limiting groove 232 at the position opposite to the limiting ridge 32. The worm gear 23 is connected to the limiting platform 31 of the rotating shaft 3 through the connecting hole 231. The axial rotation of the worm gear 23 is limited by the cooperation of the limiting groove 232 and the limiting ridge 32, so that the worm gear 23 can drive the rotating shaft 3 to rotate. The contact surface between the square limiting platform 31 and the square connecting hole 231 is a plane, which can more reliably prevent the axial rotation between the worm gear 23 and the rotating shaft 3. A bushing 6 and a first washer 7 are fitted on the rotating shaft 3 at the right end of the worm gear 23. Through the cooperation of the bushing 6 and the baffle 33, the axial movement of the worm gear 23 can be further limited. At the same time, the bushing 6 also plays a role in protecting the rotating shaft 3 and reducing noise.

[0034] like Figure 7 As described above, sleeves 8 are provided between the left and right ends of the rotating shaft 3 and the upper and lower mounting cavities 1023 of the rotating shaft. The sleeves 8 can isolate the rotating shaft 3 from the upper and lower mounting cavities 1023 of the rotating shaft, thereby protecting the rotating shaft 3 and the transmission mechanism housing 1. At the same time, it can also reduce the noise generated by direct friction. The left and right ends of the rotating shaft 3 pass through the sleeves 8 and the metal sleeves 44 on the headrest assembly, and then pass through the second gaskets 9, and are fixed by the fasteners 10.

[0035] like Figure 3 and Figure 4 As shown, the worm gear 23 in this embodiment is preferably a semi-tooth worm gear. The semi-tooth worm gear can reduce weight, decrease the inertial load on the transmission mechanism 2, and improve response speed while allowing the headrest assembly to rotate within the 4-angle range, while avoiding unnecessary slight friction between the non-meshing teeth of the full-tooth worm gear and the worm 22, thus reducing additional friction loss and noise.

[0036] like Figure 2 and Figure 6 The headrest assembly 4 includes a headrest 41 and a U-shaped headrest rod 42 connected to the headrest 41. Headrest guide sleeves 43 are connected to both ends of the headrest rod 42. The headrest guide sleeves 43 are snapped into metal sleeves 44. Two metal sleeves 44 are connected to a rotating shaft 3, and the axial movement of the metal sleeves 44 is limited by a fixing member 10 and a second washer 9. To prevent the headrest assembly 4 from interfering with the seat back 11 during folding, a clearance groove can be provided at the folding stroke position of the seat back 11 relative to the headrest assembly 4.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit them. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the present utility model.

Claims

1. A unitary flip-fold headrest, characterized by: The system includes a transmission mechanism housing (1), a transmission mechanism (2), and a rotating shaft (3). The transmission mechanism (2) is installed inside the seat back through the transmission mechanism housing (1). The transmission mechanism (2) includes a drive motor (21), a worm (22) installed on the output shaft of the drive motor (21), and a worm wheel (23) meshing with the worm (22). The rotating shaft (3) is provided on the worm wheel (23). Both ends of the rotating shaft (3) pass through the transmission mechanism housing (1) and are connected to the headrest assembly (4). The transmission mechanism housing (1) is divided into an upper housing (101) and a lower housing (102). The lower housing (102) has a motor lower mounting cavity (1021), a worm gear lower mounting cavity (1022), and a shaft lower mounting cavity (1023) connected to the worm gear lower mounting cavity (1022). The motor lower mounting cavity (1021) has a heat dissipation port (10211) and a wire harness lower clearance port (10212). The upper housing (101) has a motor upper mounting cavity (1011), a worm gear mounting cavity (1012) connected to the motor upper mounting cavity (1011), a worm gear upper mounting cavity (1013) connected to the worm gear mounting cavity (1012), and a shaft upper mounting cavity (1014) connected to the worm gear upper mounting cavity (1013). The position of the motor upper mounting cavity (1011) relative to the wire harness lower clearance port (10212) has a wire harness upper clearance port.

2. The unitary flip-fold headrest of claim 1, wherein: The drive motor (21) is horizontally arranged inside the transmission mechanism housing (1). The output shaft of the drive motor (21) has an external thread, and the middle part of the worm (22) has an internal thread that matches the external thread on the output shaft. The worm (22) is connected to the output shaft of the drive motor (21) by screwing.

3. The integral folding headrest according to claim 1, characterized in that: A rubber ring (5) is fitted between the upper part of the worm (22) and the housing (1) of the transmission mechanism.

4. The integral folding headrest according to claim 1, characterized in that: The worm (22) and worm wheel (23) mesh to form a worm pair. The helix angle of the worm pair is smaller than the equivalent friction angle, which can realize the self-locking of the transmission mechanism (2).

5. The integral folding headrest according to claim 1, characterized in that: The rotating shaft (3) is a stepped shaft with a limiting platform (31) in the middle. The limiting platform (31) has an outwardly protruding limiting ridge (32). The end of the limiting platform (31) has outwardly extending baffles (33). The worm gear (23) has a connecting hole (231) in the middle that conforms to the limiting platform (31). The connecting hole (231) has an outwardly protruding limiting groove (232) at the position relative to the limiting ridge (32). The worm gear (23) is connected to the limiting platform (31) of the rotating shaft (3) through the connecting hole (231), and the axial rotation of the worm gear (23) is limited by the cooperation of the limiting groove (232) and the limiting ridge (32).

6. The integral folding headrest according to claim 5, characterized in that: The limiting platform (31) has a bushing (6) and a first washer (7) on the rotating shaft (3) at the end away from the baffle (33). The bushing (6) and the baffle (33) clamp the worm gear (23) inside the transmission mechanism housing (1).

7. The integral folding headrest according to claim 1, characterized in that: A sleeve (8) is provided between the housing (1) of the transmission mechanism and the rotating shaft (3).

8. The integral folding headrest according to claim 1, characterized in that: The two ends of the rotating shaft (3) pass through the transmission mechanism housing (1) and the headrest assembly (4) in sequence, and then pass through the second gasket (9), and are fixed by the fastener (10).

9. The integral folding headrest according to claim 1, characterized in that: The worm gear (23) is a half-tooth worm gear.

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