Headrest driving device and headrest

Abstract

The utility model provides a headrest driving device and a headrest, and belongs to the technical field of automobiles, the headrest driving device comprises a driving piece on which an output shaft is arranged in a driving manner; the crumple separation assembly comprises a first driving part and a second driving part which are coaxially arranged, the second driving part is movably arranged relative to the first driving part, the first driving part is in driving connection with the output shaft, and the second driving part is in driving connection with the two side wings; a first driving gear and a second driving gear are respectively arranged on the opposite end surfaces of the first driving part and the second driving part, and the first driving gear can be meshed with the second driving gear; in the first working state, the output shaft rotates to drive the first driving gear to rotate synchronously, the first driving gear is meshed with the second driving gear, and the second driving gear rotates synchronously; in the second working state, the side wings are stressed to turn over to drive the second driving gear to rotate, at the moment, the second driving gear is separated from the first driving gear, and the second driving gear rotates relative to the first driving gear; the driving part has the advantages that when one or two side wings are impacted, the impact force borne by the side wings can be transmitted to the second driving part, the first driving gear is separated from the second driving gear, the second driving gear rotates relative to the first driving gear, the impact force is released, the driving part is protected, and the service life of the driving part is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobiles, and in particular relates to a driving device of a headrest and a headrest. Background Art

[0002] As a driving comfort configuration and safety protection product, the car headrest occupies an important position in the car interior parts. The demand for headrest functions by drivers and passengers is also increasing. When drivers and passengers sleep on the car seat, because the neck muscles are in a relaxed state after entering the sleep state, they generally need to lean their heads against the side supports. Therefore, the existing car headrests are usually set as sleeping headrests, that is, headrest side wings are set on both sides of the headrest frame. When the occupants need to rest, they can adjust the sleeping posture of the head by turning the left and right side wings, support the left and right sides of the occupants' heads, improve the quality of sleep, and meet the comfort requirements of passengers to the greatest extent. However, when sudden braking or other emergency situations occur during vehicle driving, the side wings of the headrest will be impacted, and the impact force will be transmitted to the drive motor along the side wings. Due to the transmission connection between the drive motor and the side wings, the drive motor will be reversed under the action of external force, causing damage to the drive motor. Utility Model Content

[0003] The utility model aims to solve the above problems in the prior art and proposes a headrest driving device which can disconnect the headrest driving device from the driving motor when impacted.

[0004] The purpose of the utility model can be achieved through the following technical solutions: A driving device for a headrest, comprising:

[0005] A driving member, on which an output shaft is drivenly arranged;

[0006] A collapse separation assembly, comprising a first drive part and a second drive part which are coaxially arranged, wherein the second drive part is movably arranged relative to the first drive part, the first drive part is drivingly connected to the output shaft, the second drive part is drivingly connected to the two side wings, and a first drive gear and a second drive gear are respectively arranged on opposite end surfaces of the first drive part and the second drive part, and the first drive gear and the second drive gear can mesh;

[0007] In the first working state, the output shaft rotates to drive the first driving gear to rotate synchronously, the first driving gear meshes with the second driving gear, and the second driving gear rotates synchronously;

[0008] In the second working state, the side wing is flipped by force, driving the second driving gear to rotate. At this time, the second driving gear is separated from the first driving gear, and the second driving gear rotates relative to the first driving gear.

[0009] In the above-mentioned driving device of the headrest, the first driving part includes a first driving ring, the first driving ring is fixed to the output shaft, and the first driving gear is located on the end surface of the first driving ring; the second driving part includes a rotatable second driving ring, and the second driving gear is located on the end surface of the second driving ring; and the other end of the second driving ring is provided with a first elastic member, and the two ends of the first elastic member are respectively against the second driving ring and the headrest shell;

[0010] In the first working state, the output shaft rotates to drive the first driving gear to rotate synchronously. At this time, the driving force of the output shaft is smaller than the meshing force generated between the first elastic member and the second driving gear. The second driving gear meshes with the first driving gear under the elastic force of the first elastic member, and the second driving gear rotates synchronously.

[0011] In the second working state, the double wings are flipped by force, driving the second drive gear to rotate. At this time, the impact force on the second drive gear is greater than the meshing force generated by the first elastic member against the second drive gear and the first drive gear. The first elastic member is compressed, and the second drive gear is separated from the first drive gear, so that the second drive gear can rotate relative to the first drive gear.

[0012] In the above-mentioned driving device for a headrest, the teeth on the first driving gear and the second driving gear are both arc teeth.

[0013] In the above-mentioned driving device of a headrest, a first limiting ring is integrally provided at the other end of the second driving ring, a limiting column is fixedly provided on the headrest shell, the first limiting ring is sleeved on the limiting column, and the first limiting ring can rotate relative to the limiting column, and the first elastic member is located in the limiting ring.

[0014] In the above-mentioned driving device of the headrest, a second limiting ring is arranged on the first driving ring, an inner wall of the second limiting ring is fixed to the output shaft, and the second driving ring and the second limiting ring are clearance-matched.

[0015] A headrest comprises the driving device of the headrest and a headrest shell, wherein the driving device of the headrest is located inside the headrest shell, and the headrest shell is provided with two side wings, and both of the side wings are drivingly connected to the driving device of the headrest.

[0016] In the above-mentioned headrest, a first transmission gear is fixedly provided on the second driving part in the driving device of the headrest, and a gear set is provided between the two side wings and the first transmission gear to realize power transmission.

[0017] In the above-mentioned headrest, two connecting blocks are arranged on each of the side wings, a connecting shaft is fixedly arranged between the two connecting blocks, and an output gear is fixedly arranged on the connecting shaft, and power transmission is achieved between the output gear and the first transmission gear through a gear set.

[0018] In the above-mentioned headrest, a protective shell is fixedly installed in the headrest shell, and the collapse separation component, gear set and output gear in the driving device of the headrest are all located in the protective shell, and a second elastic member is also provided on the output gear, and the second elastic member is respectively abutted against the end face of the output gear and the outer wall of the upper connecting block.

[0019] In the above-mentioned headrest, a limiting surface is arranged on each of the side wings, and an encapsulation shell is also arranged in the headrest shell to encapsulate and protect the driving member and the protective shell. When the limiting surface abuts against the encapsulation shell, it indicates that the side wing has been flipped to the maximum limiting angle.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] (1) When one or both of the side wings are impacted, the impact force on the side wings will be transmitted to the second driving part, the first driving gear will be separated from the second driving gear, and the second driving gear will rotate relative to the first driving gear to release the impact force, thereby protecting the driving part and improving the service life of the driving part;

[0022] (2) In order to ensure that there is a certain gap between the protective shell and the connecting block to prevent friction between the connecting block and the protective shell when the connecting block rotates, a second elastic member is provided on the output gear. The second elastic member supports the connecting block. At the same time, the setting of the elastic member can also eliminate the axial movement generated when the output gear is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of a driving device of a headrest;

[0024] Figure 2 yes Figure 1 Schematic diagram of the explosion structure;

[0025] Figure 3 It is a schematic diagram of the internal structure of the headrest;

[0026] Figure 4 yes Figure 3 One of the cross-sectional structural diagrams;

[0027] Figure 5 yes Figure 4 A local enlarged schematic diagram of the middle A;

[0028] Figure 6 It is one of the schematic diagrams of the internal structure of the headrest;

[0029] Figure 7 It is a schematic diagram of the transmission of the drive device of the headrest and the side wings;

[0030] Figure 8 yes Figure 3 The second schematic diagram of the cross-sectional structure;

[0031] Fig. 9 This is the second schematic diagram of the internal structure of the headrest.

[0032] In the figure, the driving member 100; the first driving part 101; the second driving part 102; the first driving gear 103; the second driving gear 104; the first elastic member 105; the first limiting ring 106; the limiting column 107; the second limiting ring 108; the headrest shell 200; the side wing 201; the first transmission gear 202; the second transmission gear 203; the third transmission gear 204; the fourth transmission gear 205; the fifth transmission gear 206 and the sixth transmission gear 207; the protective shell 208; the second elastic member 209; the bushing 210; the limiting surface 211; the packaging shell 212; the output gear 213; the connecting block 214; the connecting shaft 215; the upper shell 216; and the lower shell 217. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] like Figure 1-Figure 4 As shown, a driving device of a headrest comprises:

[0036] A driving member 100, on which an output shaft is drivenly disposed;

[0037] A collapse separation assembly, comprising a first drive portion 101 and a second drive portion 102 which are coaxially arranged, wherein the second drive portion 102 is movably arranged relative to the first drive portion 101, the first drive portion 101 is drivingly connected to the output shaft, and the second drive portion 102 is drivingly connected to two side wings 201, and a first drive gear 103 and a second drive gear 104 are respectively arranged on opposite end surfaces of the first drive portion 101 and the second drive portion 102, and the first drive gear 103 and the second drive gear 104 can mesh;

[0038] In the first working state, the output shaft rotates to drive the first driving gear 103 to rotate synchronously, the first driving gear 103 is meshed with the second driving gear 104, and the second driving gear 104 rotates synchronously;

[0039] In the second working state, the side wing 201 is flipped by force, driving the second driving gear 104 to rotate. At this time, the second driving gear 104 is separated from the first driving gear 103, and the second driving gear 104 rotates relative to the first driving gear 103.

[0040] In this embodiment, the rotation of the output shaft can drive the first driving part 101 to rotate synchronously, and the second driving part 102 meshing therewith can rotate synchronously to achieve control of the flipping angle of the two side wings 201; and when one or both of the side wings 201 are impacted, the impact force on the side wings 201 will be transmitted to the second driving part 102. If the first driving gear 103 and the second driving gear 104 are still in a meshing state at this time, the impact force will be transmitted to the output shaft of the driving member 100, applying an external force to the driving member 100 and causing damage to the driving member 100. Therefore, when the side wing 201 is impacted, the first driving gear 103 and the second driving gear 104 are separated. When the impact force is transmitted to the second driving gear 104, the second driving gear 104 rotates relative to the first driving gear 103 to release the impact force, thereby improving the service life of the driving member 100.

[0041] Specifically, the first driving part 101 includes a first driving ring, the first driving ring is fixed to the output shaft, and the first driving gear 103 is located on the end surface of the first driving ring; the second driving part 102 includes a rotatable second driving ring, and the second driving gear 104 is located on the end surface of the second driving ring; and the other end of the second driving ring is provided with a first elastic member 105, and the two ends of the first elastic member 105 are respectively against the second driving ring and the headrest shell 200;

[0042] In the first working state, the output shaft rotates to drive the first driving gear 103 to rotate synchronously. At this time, the driving force of the output shaft is smaller than the meshing force generated between the first elastic member 105 and the second driving gear 104 and the first driving gear 103. The second driving gear 104 meshes with the first driving gear 103 under the elastic force of the first elastic member 105, and the second driving gear 104 rotates synchronously.

[0043] In the second working state, the side wing 201 is flipped by force, driving the second driving gear 104 to rotate. At this time, the impact force on the second driving gear 104 is greater than the meshing force generated by the first elastic member 105 against the second driving gear 104 and the first driving gear 103. The first elastic member 105 is compressed, and the second driving gear 104 is separated from the first driving gear 103, so that the second driving gear 104 can rotate relative to the first driving gear 103.

[0044] In this embodiment, a first driving ring driving the first driving gear 103 is fixed to the output shaft as power output, and a second driving gear 104 is provided on the end surface of the second driving ring. The first driving gear 103 and the second driving gear 104 can mesh. In the normal working mode, the driving force of the output shaft is less than the meshing force generated between the first elastic member 105 against the second driving gear 104 and the first driving gear 103. The first elastic member 105 meshes with the first driving gear 103 against the second driving gear 104. The power of the output shaft Output, driving the two side wings 201 to adjust the angle; and when one or both of the side wings 201 are subjected to impact force, the impact force exerted on the side wings 201 will be transmitted to the second driving gear 104, and the instantaneous impact force will be greater than the meshing force generated by the first elastic member 105 against the second driving gear 104 and the first driving gear 103, so that the second driving gear 104 is separated from the first driving gear 103 and the second driving gear 104 can rotate relative to the first driving gear 103, releasing the impact force so that it will not be transmitted to the driving member 100.

[0045] It is worth mentioning that during daily use of the headrest, the head will also exert a certain pressure on the side wings 201 , and the force exerted by the head is smaller than the meshing force generated between the first elastic member 105 against the second driving gear 104 and the first driving gear 103 .

[0046] Further preferably, the tooth shapes on the first drive gear 103 and the second drive gear 104 are both arc teeth, and the end faces of the arc teeth are arc transitions. During the rotation of the second drive gear 104 relative to the first drive gear 103, the mutual bite force between the second drive gear 104 and the first drive gear 103 is reduced, making the rotation transition of the second drive gear 104 smoother.

[0047] Further preferably, the other end of the second driving ring is integrally provided with a first limiting ring 106, a limiting column 107 is fixedly provided on the headrest shell 200, the first limiting ring 106 is sleeved on the limiting column 107, and the first limiting ring 106 can rotate relative to the limiting column 107, and the first elastic member 105 is located in the limiting ring.

[0048] In this embodiment, the second driving ring is located in the headrest shell 200, and the second driving ring can rotate relative to the headrest shell 200, so a limiting column 107 is provided in the headrest shell 200, and a first limiting ring 106 is provided on the second driving ring. The relative rotation between the other end of the second driving ring and the headrest shell 200 is achieved by the socket connection between the first limiting ring 106 and the limiting column 107.

[0049] Further preferably, a second limiting ring 108 is provided on the first driving ring, the inner wall of the second limiting ring 108 is fixed to the output shaft, and the inner wall of the second driving ring and the outer wall of the second limiting ring 108 are gap-matched.

[0050] It is worth mentioning that the first elastic member 105 includes a spring, and two ends of the spring are respectively against the second driving ring and the limiting column 107.

[0051] In this embodiment, the other end of the second driving ring is rotatably connected to the headrest shell 200, and the end of the second driving ring is clearance-matched with the second limiting ring 108 to achieve relative rotation between the second driving ring and the first driving ring, and when the second driving ring moves, the second limiting ring 108 can also provide a movement guide.

[0052] like Figure 3-Figure 9 As shown, a headrest includes a driving device for the headrest and a headrest shell 200. The driving device of the headrest is located in the headrest shell 200, and two side wings 201 are provided on the headrest shell 200. Both side wings 201 are transmission-connected to the driving device of the headrest.

[0053] Preferably, a first transmission gear 202 is fixedly provided on the second driving part 102 , and a gear set is provided between the two side wings 201 and the first transmission gear 202 to realize power transmission.

[0054] In this embodiment, the first transmission gear 202 is located on the outer wall of the second limiting ring 108, which can reduce the volume occupied by components, and a gear set is arranged between the two side wings 201 and the first transmission gear 202 to realize power transmission, thereby transmitting the rotational force of the output shaft to the side wings 201.

[0055] Further preferably, two connecting blocks 214 are provided on each wing 201, a connecting shaft 215 is fixedly provided between the two connecting blocks 214, and an output gear 213 is fixedly provided on the connecting shaft 215, and power transmission is achieved between the output gear 213 and the first transmission gear 202 via a gear set.

[0056] Specifically, the gear set includes a second transmission gear 203 meshing with the first transmission gear 202, a third transmission gear 204 is fixedly arranged on the second transmission gear 203, and the third transmission gear 204 is meshed with the output gear 213 of the left wing; a fourth transmission gear 205 is meshed with the second transmission gear 203, a fifth transmission gear 206 is meshed with the fourth transmission gear 205, a sixth transmission gear 207 is fixedly arranged on the fifth transmission gear 206, and the sixth transmission gear 207 is meshed with the output gear 213 of the right wing.

[0057] Further preferably, a protective shell 208 is fixedly provided inside the headrest shell 200, and the collapse separation assembly, the gear set and the output gear 213 are all located inside the protective shell 208, and a second elastic member 209 is also provided on the output gear 213, and the second elastic member 209 is respectively against the end face of the output gear 213 and the outer wall of the upper connecting block 214.

[0058] Specifically, the protective shell 208 is formed by splicing an upper shell 216 and a lower shell 217 , and the lower shell 217 is fixed to the headrest shell 200 , and the limiting column 107 is located on the lower shell 217 .

[0059] In this embodiment, in order to ensure that there is a certain gap between the protective shell 208 and the connecting block 214 to prevent the connecting block 214 from generating friction with the protective shell 208 when rotating, a second elastic member 209 is arranged on the output gear 213. The second elastic member 209 supports the connecting block 214. At the same time, the setting of the elastic member can also eliminate the axial movement generated when the output gear 213 is working.

[0060] It is worth mentioning that both ends of the connecting shaft 215 are sleeved with bushings 210, both bushings 210 are located in the protective shell 208, and the upper end of the upper bushing 210 is against the connecting block 214, and one end of the second elastic member 209 is against the bushing 210. The bushing 210 is used to enable the second elastic member 209 to lift the upper connecting block 214; the lower bushing 210 is located below the output gear 213 and is against the lower end surface of the output gear 213.

[0061] Further preferably, a limiting surface 211 is provided on each side wing 201, and a packaging shell 212 is also provided in the headrest shell 200 to encapsulate and protect the driving member 100 and the protective shell 208. When the limiting surface 211 and the packaging shell 212 are against each other, it indicates that the side wing 201 has been flipped to the maximum limiting angle.

[0062] It should be noted that in the present utility model, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0063] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0064] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A driving device for a headrest, characterized in that: include: A driving member, on which an output shaft is drivenly arranged; A collapse separation assembly, comprising a first drive part and a second drive part which are coaxially arranged, wherein the second drive part is movably arranged relative to the first drive part, the first drive part is drivingly connected to the output shaft, the second drive part is drivingly connected to the two side wings, and a first drive gear and a second drive gear are respectively arranged on opposite end surfaces of the first drive part and the second drive part, and the first drive gear and the second drive gear can mesh; In the first working state, the output shaft rotates to drive the first driving gear to rotate synchronously, the first driving gear meshes with the second driving gear, and the second driving gear rotates synchronously; In the second working state, the side wing is flipped by force, driving the second driving gear to rotate. At this time, the second driving gear is separated from the first driving gear, and the second driving gear rotates relative to the first driving gear.

2. A driving device for a headrest according to claim 1, characterized in that: The first driving part includes a first driving ring, the first driving ring is fixed to the output shaft, and the first driving gear is located on the end surface of the first driving ring; the second driving part includes a rotatable second driving ring, and the second driving gear is located on the end surface of the second driving ring; and a first elastic member is provided at the other end of the second driving ring, and the two ends of the first elastic member are respectively against the second driving ring and the headrest shell; In the first working state, the output shaft rotates to drive the first driving gear to rotate synchronously. At this time, the driving force of the output shaft is smaller than the meshing force generated between the first elastic member and the second driving gear. The second driving gear meshes with the first driving gear under the elastic force of the first elastic member, and the second driving gear rotates synchronously. In the second working state, the double wings are flipped by force, driving the second drive gear to rotate. At this time, the impact force on the second drive gear is greater than the meshing force generated by the first elastic member against the second drive gear and the first drive gear. The first elastic member is compressed, and the second drive gear is separated from the first drive gear, so that the second drive gear can rotate relative to the first drive gear.

3. A driving device for a headrest according to claim 2, characterized in that: The teeth on the first driving gear and the second driving gear are both arc teeth.

4. A driving device for a headrest according to claim 2, characterized in that: The other end of the second driving ring is integrally provided with a first limiting ring, a limiting column is fixedly provided on the headrest shell, the first limiting ring is sleeved on the limiting column, and the first limiting ring can rotate relative to the limiting column, and the first elastic member is located in the limiting ring.

5. The driving device of the headrest according to claim 4, characterized in that: A second limiting ring is arranged on the first driving ring, an inner wall of the second limiting ring is fixed to the output shaft, and the second driving ring and the second limiting ring are loosely matched.

6. A headrest, characterized in that: It comprises a driving device for the headrest as described in any one of claims 1 to 5, and also comprises a headrest shell, wherein the driving device for the headrest is located inside the headrest shell, and the headrest shell is provided with two side wings, and both of the side wings are drivingly connected to the driving device of the headrest.

7. A headrest according to claim 6, characterized in that: A first transmission gear is fixedly arranged on the second driving part in the driving device of the headrest, and a gear set is arranged between the two side wings and the first transmission gear to realize power transmission.

8. A headrest according to claim 7, characterized in that: Two connecting blocks are arranged on each of the side wings, a connecting shaft is fixedly arranged between the two connecting blocks, and an output gear is fixedly arranged on the connecting shaft, and power transmission is achieved between the output gear and the first transmission gear via a gear set.

9. A headrest according to claim 8, characterized in that: A protective shell is fixedly arranged inside the headrest shell, and the collapse separation component, gear set and output gear in the driving device of the headrest are all located inside the protective shell. A second elastic member is also arranged on the output gear, and the second elastic member is respectively abutted against the end face of the output gear and the outer wall of the upper connecting block.

10. The headrest according to claim 6, characterized in that: A limiting surface is arranged on each of the side wings, and a packaging shell is also arranged in the headrest shell to encapsulate and protect the driving member and the protective shell. When the limiting surface abuts against the packaging shell, it indicates that the side wing has been flipped to the maximum limiting angle.

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