Composite rotating shaft mechanism and application thereof

Abstract

The utility model relates to the technical field of hinge rotating shafts of automobile armrest boxes, in particular to a composite rotating shaft mechanism and application thereof, which comprises a hinge lower support, a hinge upper support and a rotating shaft device, one end of the rotating shaft device is fixedly connected to the hinge lower support, and the other end of the rotating shaft device is fixedly connected to the hinge upper support. The hinge upper bracket freely rotates within a certain angle or hovers within a certain angle; the rotating shaft device is provided with a pin shaft and a torsional spring; the hinge upper bracket is fixedly connected to the pin shaft; the hinge lower bracket is sleeved on the pin shaft and is movably connected with the pin shaft; one end of the torsion spring abuts against the hinge lower support, and the other end of the torsion spring is fixedly connected to the pin shaft. In conclusion, the cover body can be freely bounced off at any angle; the functions of rotation hovering, free rotation and complete locking can also be achieved; and through a durability test, the elastic sheet, the gasket, the cam sheet and the concave wheel sheet are not obviously abraded, the torsion and the resistance are not obviously changed, and compared with the existing rotating shaft structure, the rotating shaft structure has the advantage of longer service life.

Description

Technical Field

[0001] The utility model relates to the technical field of hinge shafts of automobile armrest boxes, in particular to a composite shaft mechanism and application thereof. Background Art

[0002] The car armrest is a car accessory installed between two seats, belonging to the car interior system. Its humanized design is originally intended to allow car drivers to place their arms when driving for a long time, so that their arms can get an effective rest without numbness and stiffness.

[0003] With the continuous development of manufacturing technology and the continuous improvement of production processes, the armrest box has a storage function, such as storing drinks, cups and other small items, so that the driver can easily get these small items when needed. Due to the difference in usage habits between the north and the south, northerners mostly call it an armrest box, while southerners mostly call it a hand box. It is also called a central armrest box, storage box, storage box, etc.

[0004] The armrest box is usually composed of a box body and a cover body. The cover body is opened by sliding or rotating. The cover body that is opened by rotating needs to be provided with a shaft component on the rotating part to assist the opening of the cover body. In order to prevent the cover body from opening too fast and causing danger, or to optimize the opening angle or opening process of the cover body, a gasket shaft component is generally used for optimized installation.

[0005] However, the design of traditional gasket shaft components is not reasonable. They are easy to wear and deform, have poor yield (cannot recover after deformation), poor impact resistance, and poor fatigue resistance. Therefore, they are prone to wear and tear such as adhesion damage, material damage, fatigue damage, and micro-motion wear, and may even cause large vibrations, abnormal noises, inability to hover, and inability to lock.

[0006] Therefore, how to design a composite hinge mechanism and its application so that it can have the functions of free opening at any angle and speed, hovering at any angle, and locking function, is a technical problem that needs to be solved. Utility Model Content

[0007] The utility model aims to overcome the above-mentioned shortcomings and provide a technical solution that can solve the above-mentioned problems.

[0008] The utility model provides a composite pivot mechanism, comprising a hinge lower bracket, a hinge upper bracket and a pivot device, wherein the hinge lower bracket is fixedly connected to the box body of an external armrest box, the hinge upper bracket is fixedly connected to the cover body of the external armrest box, one end of the pivot device is fixedly connected to the hinge lower bracket, and the other end is fixedly connected to the hinge upper bracket, so that the hinge upper bracket can freely rotate within a certain angle relative to the hinge lower bracket, or can hover within a certain angle; the pivot device is provided with a pin and a torsion spring, the hinge upper bracket is provided with a first pin hole, the first pin hole is sleeved on the pin and forms a fixed connection with the pin; the hinge lower bracket is provided with a second pin hole, the second pin hole is sleeved on the pin and forms a movable connection with the pin; the torsion spring is sleeved on the pin, and one end abuts against the hinge lower bracket, and the other end is fixedly connected to the pin.

[0009] As a further solution of the utility model: one end of the pin-fixing torsion spring is provided with a bayonet, and one end of the torsion spring is snapped into the bayonet, thereby forming a fixed connection.

[0010] As a further solution of the utility model: the rotating shaft device is also provided with a cam piece and a concave wheel piece which are respectively sleeved on the pin shaft, and the cam piece and the concave wheel piece cooperate with each other to form a state of mutual abutment; the concave wheel piece is fixed to the lower bracket of the hinge, and the cam piece is fixed to the pin shaft; or the cam piece is fixed to the lower bracket of the hinge, and the concave wheel piece is fixed to the pin shaft.

[0011] As a further solution of the utility model: a protrusion is provided on the side wall of the cam piece abutting against the concave wheel piece, and a groove is provided on the side wall of the concave wheel piece abutting against the cam piece, and the arc length of the groove is greater than the arc length of the protrusion; the cam piece and the concave wheel piece abut against each other, so that the protrusion is embedded in the groove and moves along the groove at a certain angle, so that the upper bracket of the hinge can rotate freely within a certain angle relative to the lower bracket of the hinge.

[0012] As a further solution of the utility model: the upper hinge bracket rotates a certain angle relative to the lower hinge bracket, so that the protrusion of the cam plate moves out of the groove of the concave wheel plate, and the protrusion abuts against the side wall of the concave wheel plate, forming a sliding connection with a certain friction force, thereby making the upper hinge bracket hover at a certain angle relative to the lower hinge bracket.

[0013] As a further solution of the utility model: a slope is provided at the position where the groove of the concave wheel plate intersects with its side wall, one side of the slope is connected to the bottom of the groove, and the other side is connected to the side wall of the cam plate, so that the protrusion can slide out from the bottom of the groove relatively smoothly.

[0014] As a further solution of the utility model: the rotating shaft device is also provided with a spring assembly sleeved on the pin shaft and installed between the hinge upper bracket and the hinge lower bracket, so that the elastic force of the spring assembly can enhance the pressing effect between the cam plate and the concave wheel plate.

[0015] As a further solution of the utility model: the spring sheet assembly is provided with a first spring sheet and a second spring sheet respectively sleeved on the pin shaft, and the first spring sheet and the second spring sheet cooperate with each other and abut against each other to form a state of elastic superposition.

[0016] As a further solution of the utility model: the hinge lower bracket is provided with a bending portion, the bending portion is fixed to the hinge lower bracket, and can abut against the limiting portion of the hinge upper bracket, so that the hinge upper bracket can be locked at a certain angle.

[0017] The utility model also provides an application of a composite rotating shaft mechanism, and the composite rotating shaft mechanism is applied to an automobile armrest box.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. By setting the pin shaft and torsion spring, the hinge bracket is provided with an upward rotation torque. Then, by setting the cam plate and the concave wheel plate to cooperate with each other, they abut against each other to form friction resistance, thereby offsetting part of the rotation torque, so that the hinge bracket can be opened at a relatively slow speed, preventing the danger caused by opening too fast.

[0020] 2. A groove is provided on the side wall of the concave wheel plate, and a protrusion is provided on the side wall of the cam plate. The arc length of the groove is greater than the arc length of the protrusion, so that the upper bracket of the hinge can be freely opened to a preset corresponding angle, making the opening of the armrest box more convenient.

[0021] 3. A relatively large friction resistance is formed by the contact between the protrusion and the side wall of the concave wheel piece, and the elastic reverse thrust of the spring assembly further increases the friction resistance, so that the hinge bracket can be suspended at any angle.

[0022] Therefore, after the above-mentioned improvements, the utility model can provide a composite shaft mechanism and its application, so that the cover body fixed to the bracket on the hinge can be set to freely pop open at any angle; it can also realize the functions of rotation suspension, free rotation, and complete locking; and after 12,000 durability tests, it is shown that the spring piece, gasket, cam piece and concave wheel piece have no obvious wear, and the torque and resistance have no obvious changes, which has the advantage of longer life than the existing shaft structure.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is a schematic diagram of the overall structure of the rotating shaft mechanism of the utility model;

[0026] Figure 2 It is a schematic diagram of the structure of the side when the hinge upper bracket of the utility model rotates at an angle of 10 degrees;

[0027] Figure 3 It is a structural schematic diagram of the rotating shaft device of the utility model;

[0028] Figure 4 yes Figure 3 A schematic diagram of the structure with a partial enlargement at the center;

[0029] Figure 5 It is a structural schematic diagram of the utility model when the hinge upper bracket rotates at an angle of 45 degrees;

[0030] Figure 6 yes Figure 5 A schematic diagram of the structure with a partial enlargement at B in the middle;

[0031] Figure 7 It is a structural schematic diagram of the utility model when the hinge upper bracket rotates at an angle of 90 degrees;

[0032] Figure 8 It is a structural schematic diagram of the utility model in a decomposed state.

[0033] The reference numerals and names in the figures are as follows:

[0034] 10 hinge upper bracket; 11 first pin hole; 12 limiting part; 20 hinge lower bracket; 21 second pin hole; 22 bending part; 23 cushioning sleeve; 30 rotating shaft device; 31 torsion spring; 32 first nut; 33 second nut; 34 first gasket; 35 second gasket; 36 third gasket; 37 fourth gasket; 41 pin shaft; 42 bayonet; 51 cam piece; 52 protrusion; 61 concave wheel piece; 62 groove; 63 slope; 71 spring element assembly; 72 first spring element; 73 second spring element. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figures 1 to 8 In the embodiment of the utility model, a composite shaft mechanism includes a hinge lower bracket 20, a hinge upper bracket 10 and a shaft device 30, wherein the hinge lower bracket 20 is fixedly connected to the box body of the external armrest box, the hinge upper bracket 10 is fixedly connected to the cover body of the external armrest box, one end of the shaft device 30 is fixedly connected to the hinge lower bracket 20, and the other end is fixedly connected to the hinge upper bracket 10, so that the hinge upper bracket 10 can rotate freely within a certain angle relative to the hinge lower bracket 20, or within a certain angle. The hinge device 30 is provided with a pin shaft 41 and a torsion spring 31, the hinge upper bracket 10 is provided with a first pin hole 11, the first pin hole 11 is sleeved on the pin shaft 41 and is fixedly connected with the pin shaft 41; the hinge lower bracket 20 is provided with a second pin hole 21, the second pin hole 21 is sleeved on the pin shaft 41 and is movably connected with the pin shaft 41; the torsion spring 31 is sleeved on the pin shaft 41, and one end of the torsion spring 31 abuts against the hinge lower bracket 20, and the other end is fixedly connected to the pin shaft 41.

[0037] Specifically, the rotating shaft device 30 is further provided with a first nut 32 and a second nut 33. The first nut 32 is fixedly connected to the pin 41 through a screw connection, so that the upper hinge bracket 10 is firmly fixedly connected to the pin 41. The torsion spring 31 and the pin 41 form a locking state through the second nut 33. The torsion force generated by the torsion spring 31 can drive the upper hinge bracket 10 to rotate relative to the lower hinge bracket 20, so that the cover body can automatically rotate upward to a certain angle, and the armrest box can be opened for the user to use.

[0038] like Figure 8 As shown, preferably, one end of the pin 41 fixing the torsion spring 31 is provided with a bayonet 42, and one end of the torsion spring 31 is snapped into the bayonet 42, thereby forming a fixed connection.

[0039] Specifically, in order to strengthen the connection of the torsion spring 31 and prevent the torsion spring 31 from slipping on the pin 41 due to its torsion force, a bayonet 42 may be provided, one end of the torsion spring 31 is bent into the bayonet 42, and then fixed by the second nut 33. In order to fix the second nut 33, one end of the pin 41 where the bayonet 42 is provided is also provided with corresponding threads, so that the second nut 33 can be connected by threads to fix the torsion spring 31 in the bayonet 42. Correspondingly, the other end of the pin 41 may also be provided with threads, so that the first nut 32 can also be fixed on the pin 41 by threads.

[0040] like Figure 3 , Figure 4 and Figure 8 As shown, preferably, the rotating shaft device 30 is also provided with a cam piece 51 and a concave wheel piece 61 which are respectively sleeved on the pin shaft 41, and the cam piece 51 and the concave wheel piece 61 cooperate with each other to form a mutually abutting state; the concave wheel piece 61 is fixedly connected to the hinge lower bracket 20, and the cam piece 51 is fixedly connected to the pin shaft 41; or the cam piece 51 is fixedly connected to the hinge lower bracket 20, and the concave wheel piece 61 is fixedly connected to the pin shaft 41.

[0041] Specifically, the cam piece 51 and the concave wheel piece 61 are preferably made of a wear-resistant material with a certain friction coefficient, so that when the cam piece 51 and the concave wheel piece 61 abut each other, a certain friction resistance can be formed, and this friction resistance can slow down the rotation speed of the upper hinge bracket 10 relative to the lower hinge bracket 20, so that when the cover of the armrest box is freely rotated and opened within a certain angle, it will not cause a sudden pop-up, but will open automatically relatively gently, optimizing the user experience. Or this friction resistance can also make the upper hinge bracket 10 hover at a certain angle relative to the lower hinge bracket 20 within a certain angle, so that the cover of the armrest box also hovers at a certain angle, which is convenient for users to take items from the box of the armrest box.

[0042] like Figure 4 and Figure 8 As shown, preferably, a protrusion 52 is provided on the side wall of the cam piece 51 abutting against the concave wheel piece 61, and a groove 62 is provided on the side wall of the concave wheel piece 61 abutting against the cam piece 51, and the arc length of the groove 62 is greater than the arc length of the protrusion 52; the cam piece 51 and the concave wheel piece 61 abut against each other, so that the protrusion 52 is embedded in the groove 62 and moves along the groove 62 by a certain angle, so that the hinge upper bracket 10 can rotate freely within a certain angle relative to the hinge lower bracket 20.

[0043] Specifically, when the protrusion 52 is embedded in the groove 62, it preferably forms an abutment with the bottom of the groove 62 and forms a certain friction force, but this friction force is relatively small. Therefore, only a small friction resistance is formed. This friction resistance can slow down the rotation speed of the hinge upper bracket 10 relative to the hinge lower bracket 20, so that when the cover of the armrest box is freely rotated within a certain angle to open, it will not cause a sudden pop-up, but will open automatically relatively gently, thereby optimizing the user experience.

[0044] Secondly, the angle at which the cover is freely rotated relative to the box body is determined by the difference between the arc length of the groove 62 and the arc length of the protrusion 52. Figure 2 and Figure 4As shown, the cover can be freely rotated at an angle of 10 degrees relative to the box body and then suspended at the angle position. Figure 8 As shown, preferably, the protrusions 52 and the grooves 62 can be provided in multiple groups, for example, two groups are provided at the corresponding positions on the annular bodies of the cam plate 51 and the concave wheel plate 61 .

[0045] like Figure 5 , Figure 6 and Figure 8 As shown, preferably, the hinge upper bracket 10 is rotated at a certain angle relative to the hinge lower bracket 20, so that the protrusion 52 of the cam plate 51 moves out from the groove 62 of the concave wheel plate 61, and the protrusion 52 abuts against the side wall of the concave wheel plate 61, forming a sliding connection with a certain friction force, thereby making the hinge upper bracket 10 hover at a certain angle relative to the hinge lower bracket 20.

[0046] Specifically, when the protrusion 52 abuts against the side wall of the concave wheel piece 61, the distance between the cam piece 51 and the concave wheel piece 61 increases. Since the interval between the hinge upper bracket 10 and the hinge lower bracket 20 is fixed and unchanged, the distance between the cam piece 51 and the concave wheel piece 61 arranged therebetween increases, and the pressure between the cam piece 51 and the concave wheel piece 61 increases, thereby increasing the friction between the two, generating a relatively large rotation resistance, and then allowing the cover of the armrest box to hover at a certain angle, making it convenient for users to take items. The maximum hovering angle is preferably set to 90 degrees, and then blocked by the bending portion 22 and the limiting portion 12 to form a locked state. It can be understood that the maximum hovering angle can also be changed as needed, that is, the corresponding maximum angle can be adjusted by changing the positional relationship between the bending portion 22 and the limiting portion 12.

[0047] like Figure 6 As shown, preferably, a slope 63 is provided at the position where the groove 62 of the concave wheel plate 61 intersects with its side wall, one side of the slope 63 is connected to the bottom of the groove 62, and the other side is connected to the side wall of the cam plate 51, so that the protrusion 52 can slide out from the bottom of the groove 62 relatively smoothly.

[0048] Specifically, the slope 63 is mainly used to make the cover body relatively labor-saving when it is rotated upward again after automatically rotating 10 degrees and stopping, so as to optimize the user experience.

[0049] like Figure 4 , Figure 6 and Figure 8 As shown, preferably, the rotating shaft device 30 is also provided with a spring assembly 71 sleeved on the pin shaft 41 and installed between the hinge upper bracket 10 and the hinge lower bracket 20, so that the elastic force of the spring assembly 71 can enhance the pressing effect between the cam plate 51 and the concave wheel plate 61.

[0050] Specifically, the spring element assembly 71 is movably connected to the pin shaft 41. When the protrusion 52 of the cam piece 51 rotates a certain angle following the upper hinge bracket 10 and abuts against the side wall of the concave wheel piece 61, the distance between the cam piece 51 and the concave wheel piece 61 increases, thereby squeezing the spring element assembly 71 and causing the spring element assembly 71 to generate a reverse thrust, thereby increasing the pressure between the cam piece 51 and the concave wheel piece 61 and increasing the friction between the two, thereby causing the upper hinge bracket 10 to hover at a certain angle relative to the lower hinge bracket 20.

[0051] Secondly, when the hinge bracket 10 is rotated again to open or close in the suspended position, the friction resistance between the protrusion 52 and the side wall of the concave wheel piece 61 will also prevent the rotation, that is, the user needs to apply a certain rotation torque before the cover body can be rotated. It can be understood that by changing the elastic force of the spring assembly 71, the above friction resistance can be adjusted, so that the cover body can be suspended at a certain angle, and the user can rotate the cover body again after applying a suitable amount of force.

[0052] like Figure 8 As shown, preferably, the spring sheet assembly 71 is provided with a first spring sheet 72 and a second spring sheet 73 respectively sleeved on the pin shaft 41, and the first spring sheet 72 and the second spring sheet 73 cooperate with each other and abut against each other to form a state of elastic superposition. Specifically, the spring sheet can be set to a pot cover shape with a concave middle and a convex edge, and the two spring sheets are buckled together to enhance the elastic force along the axial direction of the pin shaft 41.

[0053] like Figure 2 and Figure 7 As shown, preferably, the hinge lower bracket 20 is provided with a bending portion 22, and the bending portion 22 is fixed to the hinge lower bracket 20 and bent toward the hinge upper bracket 10 at a certain position, so that after the hinge upper bracket 10 is rotated to a certain angle, the bending portion 22 can abut against the limiting portion 12 of the hinge upper bracket 10, so that the hinge upper bracket 10 can be locked at a desired angle.

[0054] Specifically, for example, after the hinge upper bracket 10 is rotated 90 degrees, the bent portion 22 abuts against the limit portion 12 to form a locked state. A cushioning sleeve 23 may also be provided on the bent portion 22 so that when it abuts against the limit portion 12, it has a certain cushioning effect to avoid large vibration or sound when locked.

[0055] In addition, in order to optimize the connection between the components, the rotating shaft device 30 can also be provided with a first gasket 34, a second gasket 35, a third gasket 36 and a fourth gasket 37 which are sleeved on the pin shaft 41, wherein the first gasket 34 is installed between the first nut 32 and the hinge upper bracket 10; the second gasket 35 is installed between the hinge upper bracket 10 and the spring assembly 71, and is fixed to the pin shaft 41; the third gasket 36 is installed between the hinge lower bracket 20 and the fourth gasket 37, and is fixed to the hinge lower bracket 20; the fourth gasket 37 is installed between the third gasket 36 and the torsion spring 31.

[0056] When in use, the shaft mechanism can be installed at the connection between the cover and the box of the armrest box that is turned to open. It is understandable that a corresponding lock (not shown in the figure) can also be set between the cover and the box. When the user opens the lock, the torsion of the torsion spring 31 drives the hinge upper bracket 10 to rotate upward, and the cover can be synchronously rotated upward under the drive of the hinge upper bracket 10. In addition, since the protrusion 52 of the cam plate 51 abuts against the bottom of the groove 62 of the concave wheel plate 61, a relatively small friction resistance is generated, so that the speed of the cover rotating upward will not be too fast.

[0057] like Figure 2 As shown, when the cover body rotates to 10 degrees, the protrusion 52 rotates to the edge of the groove 62 and contacts the slope 63, thereby increasing the friction resistance and making the cover body stop at the 10-degree position. The user can then rotate the cover body to apply a certain rotational force, so that the protrusion 52 continues to move upward from the slope 63, thereby contacting the side wall of the concave wheel piece 61, thereby increasing the distance between the cam piece 51 and the concave wheel piece 61, and increasing the friction resistance between the protrusion 52 and the side wall. When the user stops rotating and releases the cover body, the increased friction resistance can make the cover body hover at a corresponding angle.

[0058] If the user continues to rotate the cover upward to reach the maximum rotation angle, the bent portion 22 of the hinge lower bracket 20 can abut against the limiting portion 12 of the hinge upper bracket 10, thereby locking the cover at the maximum angle.

[0059] When the user needs to close the cover, the cover can be rotated again so that the rotation force overcomes the friction resistance, and the cover can be rotated again, and after rotating downward at a certain angle, it can be buckled with the lock of the box again to form a locked state again.

[0060] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A composite shaft mechanism, comprising a hinge lower bracket (20), a hinge upper bracket (10) and a shaft device (30), characterized in that: The hinge lower bracket (20) is fixedly connected to the box body of the external armrest box, the hinge upper bracket (10) is fixedly connected to the cover body of the external armrest box, one end of the rotating shaft device (30) is fixedly connected to the hinge lower bracket (20), and the other end thereof is fixedly connected to the hinge upper bracket (10), so that the hinge upper bracket (10) can freely rotate within a certain angle relative to the hinge lower bracket (20), or can hover within a certain angle; the rotating shaft device (30) is provided with a pin shaft (41) and a torsion spring (3 1), the hinge upper bracket (10) is provided with a first pin hole (11), the first pin hole (11) is sleeved on the pin shaft (41) and is fixedly connected to the pin shaft (41); the hinge lower bracket (20) is provided with a second pin hole (21), the second pin hole (21) is sleeved on the pin shaft (41) and is movably connected to the pin shaft (41); the torsion spring (31) is sleeved on the pin shaft (41), one end of the torsion spring (31) abuts against the hinge lower bracket (20), and the other end of the torsion spring (31) is fixedly connected to the pin shaft (41).

2. A composite shaft mechanism according to claim 1, characterized in that: One end of the pin shaft (41) fixing the torsion spring (31) is provided with a bayonet (42), and one end of the torsion spring (31) is snapped into the bayonet (42), thereby forming a fixed connection.

3. A composite shaft mechanism according to claim 1, characterized in that: The rotating shaft device (30) is further provided with a cam plate (51) and a concave wheel plate (61) respectively sleeved on the pin shaft (41), and the cam plate (51) and the concave wheel plate (61) cooperate with each other to form a mutually abutting state; the concave wheel plate (61) is fixedly connected to the hinge lower bracket (20), and the cam plate (51) is fixedly connected to the pin shaft (41); or the cam plate (51) is fixedly connected to the hinge lower bracket (20), and the concave wheel plate (61) is fixedly connected to the pin shaft (41).

4. A composite shaft mechanism according to claim 3, characterized in that: A convex block (52) is provided on the side wall of the cam plate (51) abutting against the concave wheel plate (61), and a concave groove (62) is provided on the side wall of the concave wheel plate (61) abutting against the cam plate (51), wherein the arc length of the concave groove (62) is greater than the arc length of the convex block (52); the cam plate (51) and the concave wheel plate (61) abut against each other, so that the convex block (52) is embedded in the concave groove (62) and moves along the concave groove (62) at a certain angle, thereby enabling the upper hinge bracket (10) to freely rotate relative to the lower hinge bracket (20) within a certain angle.

5. A composite shaft mechanism according to claim 4, characterized in that: The upper hinge bracket (10) rotates at a certain angle relative to the lower hinge bracket (20), so that the protrusion (52) of the cam plate (51) moves out from the groove (62) of the concave wheel plate (61), and the protrusion (52) abuts against the side wall of the concave wheel plate (61), forming a sliding connection with a certain friction force, thereby causing the upper hinge bracket (10) to hover at a certain angle relative to the lower hinge bracket (20).

6. A composite shaft mechanism according to claim 4, characterized in that: A slope (63) is provided at the intersection of the groove (62) of the concave wheel plate (61) and its side wall, one side of the slope (63) being connected to the bottom of the groove (62), and the other side of the slope (63) being connected to the side wall of the cam plate (51), so that the protrusion (52) can slide out from the bottom of the groove (62) relatively smoothly.

7. A composite shaft mechanism according to claim 4, characterized in that: The rotating shaft device (30) is further provided with a spring assembly (71) sleeved on the pin shaft (41) and installed between the hinge upper bracket (10) and the hinge lower bracket (20), so that the elastic force of the spring assembly (71) can enhance the tight contact between the cam plate (51) and the concave wheel plate (61).

8. The composite shaft mechanism according to claim 7, characterized in that: The spring sheet assembly (71) is provided with a first spring sheet (72) and a second spring sheet (73) which are respectively sleeved on the pin shaft (41); the first spring sheet (72) and the second spring sheet (73) cooperate with each other and abut against each other to form a state of elastic superposition.

9. The composite shaft mechanism according to claim 1, characterized in that: The hinge lower bracket (20) is provided with a bending portion (22), the bending portion (22) being fixedly connected to the hinge lower bracket (20) and being capable of abutting against a limiting portion (12) of the hinge upper bracket (10), so that the hinge upper bracket (10) can be locked at a certain angle.

10. An application of a composite shaft mechanism, characterized in that: The composite shaft mechanism described in any one of claims 1 to 9 is applied to an automobile armrest box.

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