Seat hinge mechanism

Abstract

This invention relates to the field of automotive component technology, specifically to a seat hinge mechanism. The mechanism includes a sliding plate, a toothed plate, a rotating shaft, a locking assembly, a resetting assembly, and a sleeve. The sliding plate and the toothed plate are axially opposed along the rotating shaft and form an internal cavity. The rotating shaft is coaxially inserted into the central through-hole of both plates. The locking assembly is housed within the cavity and engages with the rotating shaft circumferentially to prevent rotation. The sleeve is axially fixed to the sliding plate to limit the toothed plate. The locking assembly includes a locking cam, an unlocking plate, and at least two toothed blocks. The toothed blocks and the radial bosses and radial grooves of the sliding plate form a double-layer sliding fit structure. This invention significantly improves the load-bearing strength and impact resistance of the mechanism. A single unit can meet the seat adjustment strength requirements while achieving miniaturization and lightweight design. The unlocking and locking actions are smooth and reliable, adapting to complex automotive operating conditions.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, and specifically to a seat hinge mechanism. Background Technology

[0002] In automotive seating systems, adjustable armrests and backrest angles are among the core functions for enhancing passenger comfort. Currently, the most mature manual angle adjustment solution in the industry is the ratchet-pawl structure. This type of structure unlocks the seat by manually disengaging the pawl from the ratchet. After angle adjustment, the pawl is re-engaged by a spring or other elastic component to lock the angle.

[0003] However, with the continuous advancement of energy conservation and emission reduction policies in the automotive industry and the increasingly fierce competition in the vehicle market, the shortcomings of traditional ratchet and pawl adjustment mechanisms have become increasingly prominent, failing to meet the industry's development needs for lightweight, miniaturized, low-cost, and highly reliable seat components. Firstly, the traditional structure is large and heavy, with numerous parts, resulting in high mold development and manufacturing costs, making it uncompetitive in applications with stringent lightweight and cost control requirements. Secondly, the existing structure has limited load-bearing capacity; a single mechanism cannot meet the strength and impact resistance requirements of seat armrests and backrests, often requiring paired use, further increasing the complexity of seat assembly and overall weight. Thirdly, the existing structure has a small contact area, making it prone to stress concentration leading to problems such as mounting plate deformation, pawl breakage, and engagement failure when subjected to impact loads during vehicle operation, resulting in insufficient long-term reliability and safety hazards. Fourthly, the traditional structure has poor sealing, making internal moving parts susceptible to external dust and moisture corrosion, leading to wear, jamming, and significantly shortening the mechanism's lifespan. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide a seat hinge mechanism that is simple in structure, small in size, low in cost, has good sealing performance and high load-bearing strength. While achieving miniaturization and lightweight design, it ensures reliable locking and long service life. A single mechanism can meet the angle adjustment and strength requirements of car seat armrests and backrests.

[0005] The objective of this invention can be achieved through the following technical solutions: A seat hinge mechanism includes a slide plate, a toothed plate, a rotating shaft, a locking assembly, a resetting assembly, and a sleeve. The slide plate and the toothed plate are axially opposed along the rotating shaft and enclose an internal cavity. The rotating shaft coaxially passes through the central through hole of the slide plate and the toothed plate. The locking assembly is housed within the internal cavity and engages with the rotating shaft circumferentially to prevent rotation. The resetting assembly is connected to both the rotating shaft and the slide plate. The sleeve is axially fixed to the slide plate and provides axial restraint to the toothed plate. The locking assembly includes a lock. The device comprises a locking cam, an unlocking plate, and at least two toothed blocks. The sliding plate has radially alternating bosses and radially recessed grooves arranged circumferentially. The end face of the toothed block slides in engagement with the boss end face of the radial boss. The boss end faces on both sides of the guide boss of the toothed block slide in engagement with the recess end face of the radial recess. The locking cam is circumferentially anti-rotating in engagement with the rotating shaft. The outer end of the toothed block is provided with a meshing toothed band. The inner circumference of the toothed plate is provided with an inner circumferential toothed band. The unlocking plate is circumferentially anti-rotating in engagement with the rotating shaft. The unlocking plate is connected to the toothed block.

[0006] In a further improvement, the number of radial bosses and radial grooves is at least three sets, and they are evenly spaced along the circumference of the slide plate. The number of tooth blocks is the same as the number of radial bosses, and the tooth blocks are evenly distributed along the circumference of the outer periphery of the locking cam.

[0007] In a further improvement, the outer peripheral surface of the locking cam is provided with a first locking surface and a second locking surface arranged in pairs. The tooth block is provided with a first mating surface and a second mating surface on the side facing the locking cam, which are adapted to the first locking surface and the second locking surface. In the locked state, the first locking surface is in close contact with the first mating surface, and the second locking surface is in close contact with the second mating surface.

[0008] In a further improvement, the outer circumferential surface of the rotating shaft is provided with an irregularly shaped boss, and the center of the locking cam is provided with an irregularly shaped inner hole that matches the irregularly shaped boss. The irregularly shaped boss is embedded in the irregularly shaped inner hole, and the rotating shaft and the locking cam achieve circumferential anti-rotation cooperation through the irregularly shaped boss and the irregularly shaped inner hole.

[0009] In a further improvement, the locking cam has an axially protruding limiting boss on the side facing the unlocking plate, and the unlocking plate has a limiting groove that matches the limiting boss. The limiting boss is embedded in the limiting groove, and the locking cam and the unlocking plate achieve circumferential anti-rotation cooperation through the limiting boss and the limiting groove.

[0010] In a further improvement, the unlocking plate is provided with unlocking grooves that correspond one-to-one with the toothed blocks, and the toothed blocks are provided with axially protruding transmission bosses on the side facing the unlocking plate, and the transmission bosses are embedded in the unlocking grooves.

[0011] In a further improvement, the reset component is a spiral spring, the outer circumferential surface of the rotating shaft is provided with a groove, the slide plate is provided with a spring-hanging boss, the inner end of the spiral spring is provided with an inner spring hook, and the outer end is provided with an outer spring hook. The inner spring hook is snapped and fixed in the groove, and the outer spring hook is attached and fixed to the spring-hanging boss.

[0012] In a further improvement, the radial groove of the slide plate extends axially to form a spring receiving cavity, and the spiral spring is housed in the spring receiving cavity, with the whole being located in the internal cavity.

[0013] In a further improvement, the sleeve is an annular sleeve structure, one end of which is welded and fixed to the outer periphery of the slide plate, and the other end is provided with an inwardly extending annular flange, the inner diameter of which is smaller than the outer diameter of the toothed plate.

[0014] Further improvements include a sealing sleeve, which is snapped and fixed in a groove at the outer end of the rotating shaft.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention utilizes a double-layered fit structure, in which the end face of the toothed block slides against the boss end face of the slide plate, and the end face of the boss of the toothed block slides against the groove end face of the slide plate. This significantly increases the shear area of ​​the toothed block and the slide plate in the locked state, effectively reducing the compressive stress of the toothed block on the slide plate under impact load, reducing the deformation of the slide plate, and significantly improving the overall strength, load-bearing capacity, and impact resistance of the mechanism. A single mechanism can meet the strength requirements for angle adjustment of car seat armrests and backrests. 2. This invention integrates all core functional components such as toothed blocks, locking cams, unlocking plates, and spiral springs into the internal cavity formed by the slide plate and toothed plate, which greatly reduces the overall volume and weight of the mechanism, adapting to the development trend of energy conservation, emission reduction, and lightweighting in the automotive industry; at the same time, it simplifies the overall structure of the mechanism, reduces the number of parts, lowers the mold development and production processing costs, and enhances the market competitiveness of the product. 3. This invention uses a rotating shaft to drive the locking cam and unlocking plate to rotate synchronously. When unlocking, the unlocking groove of the unlocking plate drives the toothed block to slide smoothly radially, so that the toothed band of the toothed block quickly disengages from the toothed band of the toothed plate, and the unlocking action is smooth and without jamming. When locking, the spiral spring provides a continuous and stable reset torque, driving the locking cam to push the toothed block to reset radially outward, so that the toothed band is precisely engaged. The locking surface of the locking cam and the mating surface of the toothed block are tightly fitted to form a stable radial limit. There is no lateral movement in the locked state, and the angle adjustment is precise. It can adapt to complex working conditions such as vibration and impact during vehicle driving, and ensure the safety of seat adjustment. Attached Figure Description

[0016] Figure 1 This is an exploded view of the present invention; Figure 2 This is a front view of the present invention; Figure 3 for Figure 2 Sectional view along the middle AA direction; Figure 4 for Figure 2 Sectional view along the BB direction; Figure 5 This is a front axonometric view of the toothed block in this invention; Figure 6 This is an isometric view of the reverse side of the tooth block in this invention; Figure 7 This is a schematic diagram of the assembly of the slide plate, rotating shaft and spiral spring in this invention; Figure 8 This is a schematic diagram of the assembly of the rotating shaft and the spiral spring in this invention; Figure 9 This is a schematic diagram of the assembly of the slide plate, rotating shaft, locking cam and toothed block in this invention; Figure 10 This is an assembly diagram of the slide plate, rotating shaft, locking cam, toothed block and unlocking plate in this invention; Figure 11 This is a schematic diagram showing the engagement of the toothed plate, locking cam, toothed block, and unlocking plate in the locked state of the present invention. Figure 12 This is a schematic diagram showing the engagement of the toothed plate, locking cam, toothed block, and unlocking plate in the unlocked state of the present invention. Figure 13 This is an assembly diagram of the externally mounted spiral spring in this invention; Figure 14 This is a schematic diagram illustrating an application embodiment of the seat hinge mechanism described in this invention.

[0017] In the figure, 101 is a sliding plate; 1011 is a radial boss; 1011a is the boss end face; 1012 is a radial groove; 1012a is the groove end face; 1013 is a hanging spring boss; 102 is a spiral spring; 1021 is an inner hook of the spring; 1022 is an outer hook of the spring; 103 is a rotating shaft; 1031 is a slot; 1032 is a shaped boss; 104 is a locking cam; 1041 is a first locking surface; 1042 is a second locking surface; 1043 is a limiting boss; 1044 is a shaped inner hole; 105 is a toothed block; 105 1. First mating surface; 1052. Second mating surface; 1053. Engaging toothed belt; 1054. Unlocking boss; 1055. Two side end faces; 1056. Guide boss; 1056a. Two side end faces of the guide boss; 106. Unlocking piece; 1061. Limiting groove; 1062. Unlocking groove; 107. Toothed plate; 1071. Inner toothed ring; 108. Sheath; 109. Sealing sleeve; A. Internal cavity; 001. Backrest A plate; 002. Backrest B plate; 003. Unlocking rod; 004. Pull cable; 005. Unlocking handle. Detailed Implementation

[0018] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", 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 invention 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 invention.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] The following describes the embodiments and appendices. Figures 1-14 The technical solution of the present invention will be further described below.

[0021] Example 1 A seat hinge mechanism includes a slide plate 101, a toothed plate 107, a rotating shaft 103, a locking assembly, a reset assembly, and a sleeve 108. The slide plate 101 and the toothed plate 107 are axially opposed along the rotating shaft 103 and enclose an internal cavity A. The rotating shaft 103 is coaxially inserted into the central through hole of the slide plate 101 and the toothed plate 107. The locking assembly is housed in the internal cavity A and engages with the rotating shaft 103 circumferentially to prevent rotation. The reset assembly is connected to both the rotating shaft 103 and the slide plate 101. The sleeve 108 is axially fixed to the slide plate 101 and provides axial limitation for the toothed plate 107. The locking assembly includes a locking cam 104, an unlocking plate 106, and at least... Two toothed blocks 105 are provided. The slide plate 101 is provided with radial bosses 1011 and radial grooves 1012 arranged alternately in the circumferential direction. The two end faces 1055 of the toothed blocks 105 are slidably engaged with the boss end faces 1011a of the radial bosses 1011. The two end faces 1056a of the guide bosses 1056 of the toothed blocks 105 are slidably engaged with the groove end faces 1012a of the radial grooves 1012. The locking cam 104 is circumferentially anti-rotating engaged with the rotating shaft 103. The outer end of the toothed blocks 105 is provided with a meshing toothed band 1053. The inner circumference of the toothed plate 107 is provided with an internal toothed ring 1071. The unlocking plate 106 is circumferentially anti-rotating engaged with the rotating shaft 103. The unlocking plate 106 is engaged and connected with the toothed blocks 105.

[0022] like Figures 1-14 As shown, the present invention includes a slide plate 101, a toothed plate 107, a rotating shaft 103, a locking assembly, a reset assembly, and a sleeve 108. The slide plate 101 and the toothed plate 107 are axially opposed to each other along the rotating shaft 103, forming an internal cavity A. The rotating shaft 103 is coaxially inserted into the central through hole of the slide plate 101 and the toothed plate 107. The locking assembly is housed in the internal cavity A and engages with the rotating shaft 103 to prevent rotation, thereby realizing the locking and unlocking actions of the mechanism. The reset assembly is connected to the rotating shaft 103 and the slide plate 101 respectively, providing the driving force for locking and resetting the mechanism. The sleeve 108 is axially fixedly connected to the slide plate 101, surrounding the toothed plate 107 between them, forming an axial limit on the toothed plate 107, ensuring that the toothed plate 107 can rotate circumferentially around the rotating shaft 103. The locking assembly includes a locking cam 104, an unlocking plate 106, and at least two toothed blocks 105, all of which are housed within the internal cavity A and work together to complete the locking and unlocking actions of the mechanism. The specific structure and cooperation relationship of each component are as follows: The slide plate 101 has radially alternating bosses 1011 and radially recessed grooves 1012 on one end face facing the internal cavity A. The two sides of each radial boss 1011 form boss end faces 1011a, and the boss end faces 1011a of two adjacent radial bosses 1011 form guide grooves for the radial sliding of the toothed block 105. The two sides of each radially recessed groove 1012 form recessed end faces 1012a for sliding engagement with the toothed block 105. The toothed block 105 has a first mating surface 1051 and a second mating surface 1052 at its radially inner end, and a meshing toothed band 1053 at its radially outer end. The toothed block end faces 1055 on both sides of the toothed block 105 slide in engagement with the boss end faces 1011a of the adjacent radial bosses 1011, enabling radial sliding guidance of the toothed block 105. The toothed block 105 also has outwardly protruding guide bosses 1056 on both axial sides. The boss end faces 1056a on both sides of the guide bosses 1056 slide in engagement with the groove end faces 1012a of the radial grooves 1012. This double-layer sliding engagement reduces the compressive stress of the toothed block 105 on the slide plate 101 under impact loads, reduces the deformation of the slide plate 101, and improves the overall strength and load-bearing capacity of the mechanism. The toothed block 105 also has a transmission boss 1054 on the side facing the unlocking plate 106 for transmission with the unlocking plate 106. The locking cam 104 is coaxially sleeved on the outside of the rotating shaft 103 and is circumferentially anti-rotating with the rotating shaft 103, and can rotate synchronously with the rotating shaft 103. The outer periphery of the locking cam 104 is provided with a first locking surface 1041 and a second locking surface 1042 corresponding to the number of tooth blocks 105. In the locked state, the first locking surface 1041 and the second locking surface 1042 respectively contact and fit with the first mating surface 1051 and the second mating surface 1052 of the corresponding tooth block 105, forming a radial limit on the tooth block 105, and ensuring that the meshing tooth strip 1053 of the tooth block 105 is stably meshed with the inner peripheral tooth strip 1071 of the tooth plate 107. The unlocking plate 106 is coaxially sleeved on the outside of the rotating shaft 103 and is circumferentially anti-rotating with the rotating shaft 103, and can rotate synchronously with the rotating shaft 103. The unlocking plate 106 is provided with an unlocking groove 1062 that is adapted to the transmission boss 1054. The transmission boss 1054 is embedded in the unlocking groove 1062. When the unlocking plate 106 rotates with the rotating shaft 103, it can drive the toothed block 105 to slide radially along the boss end face 1011a of the slide plate 101, so that the meshing toothed band 1053 of the toothed block 105 disengages from the inner circumferential toothed band 1071 of the toothed plate 107, thereby unlocking the mechanism. The inner circumference of the toothed plate 107 is provided with an inner circumferential toothed belt 1071, which can engage with the meshing toothed belt 1053 of the toothed block 105 to achieve locking of the mechanism.

[0023] The working principle of this invention is as follows: Practical application of the present invention, such as assembly Figure 13As shown, 100 is the device involved in this application. Its slide plate 101 is welded and fixed to the backrest A plate 001 (seat armrest or backrest frame) via its connecting boss 1014. The toothed plate 107 is welded and fixed to the backrest B plate 002 via its connecting boss 1072. The backrest B plate 002 is fixed relative to the vehicle body. The extended end of the rotating shaft 103 is fixed to the unlocking rod 003. The unlocking rod 003 is connected to the unlocking handle 005 inside the vehicle via the pull cable 004, forming a complete manual unlocking adjustment system. The specific usage process of the mechanism is as follows: When the mechanism is in the normal locked position, the reset component continuously provides the driving force in the locking direction to the rotating shaft 103, which drives the locking cam 104 and the unlocking plate 106 to remain in the locked position. The first locking surface 1041 and the second locking surface 1042 of the locking cam 104 are in close contact with the first mating surface 1051 and the second mating surface 1052 of the tooth block 105, respectively, forming a stable radial limit on the tooth block 105, forcing the meshing toothed band 1053 at the outer end of the tooth block 105 to fully mesh with the inner circumferential toothed band 1071 of the inner circumference of the tooth plate 107.

[0024] At this time, the toothed plate 107 and the slide plate 101 cannot rotate relative to each other. The backrest A plate 001 fixed to the slide plate 101 and the backrest B plate 002 fixed to the toothed plate 107 are locked relative to each other. The angle of the seat armrest or backrest is completely fixed, which can stably withstand the load of the driver and passengers as well as the impact vibration during the vehicle's operation. When passengers need to adjust the seat armrest or backrest angle, they can pull the unlocking lever 005, which transmits force through the pull cable 004, causing the unlocking lever 003 to rotate. This, in turn, drives the rotating shaft 103 to rotate around its own axis, overcoming the driving force of the reset assembly. The rotating shaft 103 simultaneously drives the locking cam 104 and the unlocking plate 106, which are in circumferential anti-rotation engagement with it, to rotate synchronously. The unlocking groove 1062 of the unlocking plate 106, through the transmission boss 1054 of the toothed block 105, drives all the toothed blocks 105 to slide radially inward along the boss end face 1011a of the slide plate 101, so that the meshing toothed belt 1053 of the toothed block 105 completely disengages from the inner circumferential toothed belt 1071 of the toothed plate 107. At the same time, the locking surface of the locking cam 104 disengages from the mating surface of the toothed block 105, releasing the radial limit on the toothed block 105, and the mechanism completes the unlocking.

[0025] At this time, the toothed plate 107 and the slide plate 101 can rotate freely relative to each other around the rotating shaft 103. When the driver or passenger moves the seat armrest or backrest, the backrest A plate 001 and the slide plate 101 can rotate synchronously, and the backrest B plate 002 fixed to the vehicle body can be adjusted to the target angle to complete the angle adjustment of the seat armrest or backrest. After the seat armrest or backrest angle is adjusted, the driver or passenger releases the unlocking handle 005, completely removing the driving force on the rotating shaft 103; the reset assembly drives the rotating shaft 103 to rotate in the opposite direction, simultaneously driving the locking cam 104 and the unlocking plate 106 to rotate and reset; the locking surface of the locking cam 104 re-fits tightly with the mating surface of the toothed block 105, pushing the toothed block 105 to slide radially outward, so that the meshing toothed belt 1053 of the toothed block 105 re-engages completely with the inner circumferential toothed belt 1071 of the toothed plate 107, and the mechanism returns to the locked state.

[0026] At this point, backrest A plate 001 and backrest B plate 002 are fixed relative to each other again, and the target angle of the seat armrest or backrest is locked, completing one full angle adjustment operation. The mechanism can repeat the above unlock-adjust-lock process to achieve multi-position continuous angle adjustment of the seat armrest or backrest.

[0027] The present invention has the following beneficial effects: 1. The double-layer engagement structure, which involves the sliding engagement of the two end faces 1055 of the toothed block 105 with the boss end face 1011a of the slide plate 101 and the sliding engagement of the boss end face 1056a of the toothed block 105 with the groove end face 1012a of the slide plate 101, significantly increases the shear area of ​​the toothed block 105 and the slide plate 101 in the locked state. This effectively reduces the compressive stress of the toothed block 105 on the slide plate 101 under impact load, reduces the stress deformation of the slide plate 101, and significantly improves the overall strength, load-bearing capacity and impact resistance of the mechanism. A single mechanism can meet the strength requirements for angle adjustment of car seat armrests and backrests. 2. Compared with the traditional ratchet and pawl adjustment mechanism, this mechanism integrates all core functional components such as the toothed block 105, locking cam 104, unlocking plate 106, and spiral spring 102 into the internal cavity A formed by the slide plate 101 and the toothed plate 107, which greatly reduces the overall size and weight of the mechanism, adapting to the development trend of energy conservation, emission reduction, and lightweighting in the automotive industry; at the same time, it simplifies the overall structure of the mechanism, reduces the number of parts, lowers the mold development and production processing costs, and enhances the market competitiveness of the product. 3. The locking cam 104 and the unlocking plate 106 are rotated synchronously by the rotating shaft 103. When unlocking, the unlocking groove 1062 of the unlocking plate 106 drives the toothed block 105 to slide smoothly in the radial direction, so that the toothed belt 1053 of the toothed block 105 and the toothed belt 1071 of the toothed plate 107 can quickly disengage, and the unlocking action is smooth and without jamming. When locking, the spiral spring 102 provides a continuous and stable reset torque, which drives the locking cam 104 to push the toothed block 105 to reset radially outward, so that the toothed belt can be precisely engaged. The locking surface of the locking cam and the mating surface of the toothed block are tightly fitted to form a stable radial limit. There is no movement in the locked state, and the angle adjustment is precise. It can adapt to complex working conditions such as vibration and impact during the car driving process, and ensure the safety of seat adjustment.

[0028] As a further preferred embodiment, the number of radial bosses 1011 and radial grooves 1012 is at least three sets, and they are evenly spaced along the circumference of the slide plate 101. The number of tooth blocks 105 is the same as the number of radial bosses 1011, and the tooth blocks 105 are evenly distributed along the circumference of the outer periphery of the locking cam 104.

[0029] Specifically, at least three sets of circumferentially evenly arranged radial bosses 1011 and radial grooves 1012, in conjunction with a corresponding number of circumferentially evenly distributed toothed blocks 105, ensure that the circumferential force of the mechanism is completely symmetrical in the locked state, avoiding the deformation of the slide plate 101 and the breakage of the toothed blocks 105 caused by concentrated force on one side, and further improving the overall load-bearing strength and impact resistance of the mechanism; the synchronous engagement and locking of multiple sets of toothed blocks 105 significantly increases the total contact area of ​​the toothed belt engagement, and significantly improves the locking torque bearing capacity. A single mechanism can meet the high-strength use requirements of car seat backrests and armrests, eliminating the need for paired use and simplifying the seat assembly structure; the evenly arranged structure makes the radial sliding guidance of each toothed block 105 more consistent, and the synchronization of unlocking and locking actions is better, avoiding the problem of individual toothed blocks 105 getting stuck or not engaging properly, and improving the reliability and stability of the mechanism's operation.

[0030] As a further preferred embodiment, the outer peripheral surface of the locking cam 104 is provided with a first locking surface 1041 and a second locking surface 1042 arranged in pairs. The tooth block 105 facing the locking cam 104 is provided with a first mating surface 1051 and a second mating surface 1052 that are adapted to the first locking surface 1041 and the second locking surface 1042. In the locked state, the first locking surface 1041 is in close contact with the first mating surface 1051, and the second locking surface 1042 is in close contact with the second mating surface 1052.

[0031] Specifically, the paired first locking surface 1041 and second locking surface 1042, together with the corresponding mating surfaces 1051 and 1052, form a double-sided contact limiting structure. In the locked state, the contact area between the locking cam 104 and the toothed block 105 is doubled, effectively reducing the contact stress per unit area, avoiding wear and plastic deformation of the mating surfaces after long-term use, and extending the service life of the mechanism. The double-sided contact limiting method can form a bidirectional radial limit on the toothed block 105. In the locked state, the toothed block 105 has no radial movement margin, completely avoiding the problem of the toothed block 105 loosening and meshing failure under vehicle vibration conditions, and greatly improving locking stability and safety of use.

[0032] As a further preferred embodiment, the outer peripheral surface of the rotating shaft 103 is provided with a shaped boss 1032, and the center of the locking cam 104 is provided with a shaped inner hole 1044 that matches the shaped boss 1032. The shaped boss 1032 is embedded in the shaped inner hole 1044, and the rotating shaft 103 and the locking cam 104 achieve circumferential anti-rotation cooperation through the shaped boss 1032 and the shaped inner hole 1044.

[0033] Specifically, the interlocking anti-rotation structure of the irregular boss 1032 and the irregular inner hole 1044 ensures that the circumferential transmission between the rotating shaft 103 and the locking cam 104 is gapless and slip-free, and the torque transmission for unlocking and locking is precise and efficient. This completely avoids the gap wear and transmission lag problems that are prone to occur in traditional key connections, ensuring the synchronization and accuracy of the action. The integrated interlocking structure is easy to assemble, requiring no additional fasteners, simplifying the assembly process. At the same time, the compact structure does not occupy additional radial space, which is suitable for the design requirements of miniaturization and lightweighting of the mechanism. The transmission structure with irregular surface contact has a stronger torque bearing capacity and can withstand the alternating load of frequent unlocking and locking. It is not easy to deform or break, which improves the service life and long-term reliability of the mechanism.

[0034] As a further preferred embodiment, the locking cam 104 has an axially protruding limiting boss 1043 on the side facing the unlocking piece 106, and the unlocking piece 106 has a limiting groove 1061 adapted to the limiting boss 1043. The limiting boss 1043 is embedded in the limiting groove 1061, and the locking cam 104 and the unlocking piece 106 achieve circumferential anti-rotation cooperation through the limiting boss 1043 and the limiting groove 1061.

[0035] Specifically, the interlocking anti-rotation structure of the limiting boss 1043 and the limiting groove 1061 enables the locking cam 104 and the unlocking piece 106 to rotate completely synchronously in the circumference. This ensures that the actions of the unlocking piece 106 driving the toothed block 105 to slide during unlocking and the locking cam 104 pushing the toothed block 105 to reset during locking are completely coordinated, avoiding unlocking jamming and locking incomplete problems caused by asynchronous actions. The axial interlocking structure does not require additional welding or riveting, making assembly convenient. At the same time, it can provide axial auxiliary limiting for the locking cam 104 and the unlocking piece 106, preventing axial movement of the two and improving the operational stability of the internal moving parts.

[0036] As a further preferred embodiment, the unlocking plate 106 is provided with an unlocking groove 1062 corresponding to the toothed block 105, and the toothed block 105 is provided with an axially protruding unlocking boss 1054 on the side facing the unlocking plate 106, and the unlocking boss 1054 is embedded in the unlocking groove 1062.

[0037] Specifically, the transmission structure in which the unlocking boss 1054 and the unlocking groove 1062 are fitted one-to-one can realize that when the unlocking plate 106 rotates, it can synchronously drive all the toothed blocks 105 to slide radially inward, ensuring that all the toothed blocks 105 disengage from the toothed plate 107 at the same time. This completely avoids the unlocking failure and angle adjustment jamming caused by individual toothed blocks 105 not being completely disengaged, and improves the smoothness and reliability of the unlocking action. The interlocking transmission structure is gapless and precise, and can accurately control the radial sliding stroke of the toothed blocks 105. This ensures that the toothed blocks 105 are completely disengaged when unlocking, and avoids component interference caused by excessive sliding. When locking and resetting, it can also assist the toothed blocks 105 to return to their precise position, ensuring that the engagement is in place.

[0038] As a further preferred embodiment, the reset component is a spiral spring 102, the outer peripheral surface of the rotating shaft 103 is provided with a groove 1031, the slide plate 101 is provided with a spring-hanging boss 1013, the inner end of the spiral spring 102 is provided with an inner spring hook 1021, and the outer end is provided with an outer spring hook 1022. The inner spring hook 1021 is snapped and fixed in the groove 1031, and the outer spring hook 1022 is hooked and fixed on the spring-hanging boss 1013.

[0039] Specifically, the reset structure of the spiral spring 102 can provide a continuous and stable circumferential reset torque between the rotating shaft 103 and the slide plate 101. After the unlocking external force is removed, it can quickly drive the rotating shaft 103 to rotate and reset, ensuring that the mechanism automatically locks, with fast reset response and timely and reliable locking action. The fixing method of the inner hook 1021 engaging with the slot 1031 and the outer hook 1022 engaging with the hanging spring boss 1013 is convenient to assemble, firmly connected, and not easy to loosen or fall off, ensuring that the reset force is stable and does not decrease during long-term use. The spiral spring 102 has a compact structure and occupies little space, which can perfectly adapt to the internal cavity layout of the mechanism. At the same time, the torque output is uniform and impact-free, which can adapt to frequent reciprocating unlocking and locking actions, with a long fatigue life, improving the long-term reliability of the mechanism.

[0040] As a further preferred embodiment, the radial groove 1012 of the slide plate 101 extends axially to form a spring receiving cavity, and the spiral spring 102 is housed in the spring receiving cavity and is located entirely in the internal cavity A.

[0041] Specifically, the spiral spring 102 is built into the spring receiving cavity and internal cavity A of the slide plate 101, realizing a fully built-in layout of the reset component. It does not require external space of the mechanism, greatly reducing the overall volume and axial dimension of the mechanism, and further realizing miniaturization and lightweight design, which is suitable for the narrow installation space requirements of car seats. The built-in layout completely encloses the spiral spring 102 inside the mechanism, which can avoid the corrosion and jamming of the spring by external dust, moisture and foreign objects, prevent the spring from rusting and fatigue failure, and at the same time avoid interference between the spring operation and external components, improving the spring's operational stability and service life. The spring receiving cavity is formed by the radial groove 1012, which eliminates the need for additional processing of the spring installation structure, simplifies the processing technology of the slide plate 101, reduces mold development costs, and makes spring assembly convenient. It can be directly embedded into the receiving cavity to complete the hanging and fixing, improving assembly efficiency.

[0042] As a further preferred embodiment, the sleeve 108 is an annular sleeve structure, one end of which is welded and fixed to the outer periphery of the slide plate 101, and the other end is provided with an inwardly extending annular flange, the inner diameter of which is smaller than the outer diameter of the toothed plate 107.

[0043] Specifically, the annular sleeve structure 108, in conjunction with the annular flange at the end, can reliably limit the axial movement of the toothed plate 107, ensuring that the toothed plate 107 can rotate freely around the axis while completely preventing axial movement and disengagement, thus ensuring the overall assembly stability of the mechanism. The welded connection is firm, can withstand long-term vibration loads, and is not easy to loosen. After the sleeve 108 is welded and fixed to the slide plate 101, it forms a closed outer shell that completely encloses the internal core moving parts, effectively preventing foreign objects and moisture from entering the mechanism, improving sealing and protection performance, preventing wear and jamming of internal parts, and extending the service life of the mechanism.

[0044] As a further preferred embodiment, a sealing sleeve 109 is also included, which is snapped and fixed in the outer end groove 1031 of the rotating shaft 103.

[0045] Specifically, the sealing sleeve 109 is snapped into the slot 1031 at the outer end of the rotating shaft 103, which can completely seal the assembly gap between the rotating shaft 103 and the central through hole of the slide plate 101, completely preventing external dust, moisture and impurities from entering the mechanism through the central through hole, preventing internal moving parts from rusting, wearing and jamming, further improving the sealing and protection performance of the mechanism and extending its service life; the snap-fit ​​fixing method is convenient to assemble, requires no additional fasteners, is easy to disassemble and maintain, and is also firmly snapped and not easy to fall off, which can adapt to the vibration conditions of vehicle driving and will not loosen after long-term use.

[0046] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A seat hinge mechanism, characterized in that, The system includes a sliding plate, a toothed plate, a rotating shaft, a locking assembly, a resetting assembly, and a sleeve. The sliding plate and the toothed plate are axially opposed along the rotating shaft and enclose an internal cavity. The rotating shaft coaxially passes through the central through holes of the sliding plate and the toothed plate. The locking assembly is housed within the internal cavity and engages with the rotating shaft to prevent rotation. The resetting assembly is connected to both the rotating shaft and the sliding plate. The sleeve is axially fixed to the sliding plate and provides axial limitation for the toothed plate. The locking assembly includes a locking cam and a release cam. The device comprises a locking plate and at least two toothed blocks. The sliding plate has radially alternating bosses and radially recessed grooves arranged circumferentially. The end face of the toothed block slides in engagement with the boss end face of the radial boss. The boss end faces on both sides of the guide boss of the toothed block slide in engagement with the recess end face of the radial recess. The locking cam is circumferentially anti-rotating in engagement with the rotating shaft. The outer end of the toothed block is provided with a meshing toothed band. The inner circumference of the toothed plate is provided with an inner circumferential toothed band. The unlocking plate is circumferentially anti-rotating in engagement with the rotating shaft. The unlocking plate is connected to the toothed block.

2. The seat hinge mechanism according to claim 1, characterized in that, The radial bosses and radial grooves are each in at least three sets and are evenly spaced along the circumference of the slide plate. The number of tooth blocks is the same as the number of radial bosses, and the tooth blocks are evenly distributed along the circumference of the outer periphery of the locking cam.

3. A seat hinge mechanism according to claim 1, characterized in that, The outer peripheral surface of the locking cam is provided with a pair of first locking surfaces and second locking surfaces. The tooth block is provided with a first mating surface and a second mating surface on the side facing the locking cam, which are adapted to the first locking surface and the second locking surface. In the locked state, the first locking surface is in close contact with the first mating surface, and the second locking surface is in close contact with the second mating surface.

4. A seat hinge mechanism according to claim 1, characterized in that, The outer circumferential surface of the rotating shaft is provided with an irregularly shaped boss, and the center of the locking cam is provided with an irregularly shaped inner hole that matches the irregularly shaped boss. The irregularly shaped boss is embedded in the irregularly shaped inner hole, and the rotating shaft and the locking cam achieve circumferential anti-rotation cooperation through the irregularly shaped boss and the irregularly shaped inner hole.

5. A seat hinge mechanism according to claim 1, characterized in that, The locking cam has an axially protruding limiting boss on the side facing the unlocking plate, and the unlocking plate has a limiting groove that matches the limiting boss. The limiting boss is embedded in the limiting groove, and the locking cam and the unlocking plate achieve circumferential anti-rotation cooperation through the limiting boss and the limiting groove.

6. A seat hinge mechanism according to claim 1, characterized in that, The unlocking plate has unlocking grooves that correspond one-to-one with the toothed blocks. The toothed blocks have axially protruding transmission bosses on the side facing the unlocking plate, and the transmission bosses are embedded in the unlocking grooves.

7. A seat hinge mechanism according to claim 1, characterized in that, The reset component is a spiral spring. The outer circumferential surface of the rotating shaft is provided with a groove. The slide plate is provided with a spring-hanging boss. The inner end of the spiral spring is provided with an inner spring hook, and the outer end is provided with an outer spring hook. The inner spring hook is snapped and fixed in the groove, and the outer spring hook is attached and fixed to the spring-hanging boss.

8. A seat hinge mechanism according to claim 7, characterized in that, The radial groove of the slide plate extends axially to form a spring receiving cavity, and the spiral spring is housed in the spring receiving cavity, with the whole being located in the internal cavity.

9. A seat hinge mechanism according to claim 1, characterized in that, The sleeve is an annular sleeve structure, one end of which is welded and fixed to the outer periphery of the slide plate, and the other end is provided with an inwardly extending annular flange, the inner diameter of which is smaller than the outer diameter of the toothed plate.

10. A seat hinge mechanism according to claim 7, characterized in that, It also includes a sealing sleeve, which is snapped and fixed in a groove at the outer end of the rotating shaft.

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