CN209409860U - A kind of automotive seat and seat angle adjustor core members - Google Patents

Abstract

The utility model discloses a kind of automotive seat and seat angle adjustor core members, the core members include coulisse, ratchet, two the first sliding blocks and two the second sliding blocks, coulisse has inner cavity, the circumferentially-spaced of inner cavity is set there are four boss, sliding slot is formed between adjacent lands, form four sliding slots altogether to accommodate two the first sliding blocks and two the second sliding blocks respectively, two first sliding blocks, two second sliding blocks are with respect to the central symmetry of coulisse；Boss is special-shaped boss, and the outside wall surface of special-shaped boss includes the cambered surface of at least two sections different-diameters, or/and special-shaped boss inner wall include at least two sections different-diameters cambered surface；Using special-shaped boss structure in the utility model, the higher use intensity of coulisse can be realized with lesser boss volume, and then increase slider width, the number of teeth amount of sliding block can greatly increase, the number with ratchet engaging tooth is considerably increased in this way, increase engagement area, and substantially increases the integral strength of coulisse.

Description

Automobile seat and seat angle adjuster core piece

Technical Field

The utility model relates to a seat angle modulation technical field, concretely relates to car seat and seat angle modulation ware core piece.

Background

The automobile seat is an important component of an automobile, and in the using process of the seat, in order to meet different requirements, the angle of a backrest needs to be properly adjusted. An important component for achieving seat angle adjustment is a seat recliner.

With the development trends of energy conservation and emission reduction in the automobile industry, new energy automobiles and the like, the weight of parts of the automobile needs to be reduced continuously under the condition of ensuring that the safety performance is not reduced. Therefore, the automobile seat also needs to be lighter, and the seat back angle adjusting mechanism needs to be lighter, which is a demand of the automobile industry for light weight.

At present, less material is generally used for weight reduction, which inevitably brings about reduction of safety, and in order to meet safety performance and have lower weight, the seat angle adjuster is generally made of a material with higher strength, but the cost of the material with higher strength is increased, and the processing cost of the material with high strength is also higher.

Therefore, how to reduce the cost as much as possible on the premise of meeting the use requirement of the recliner is a technical problem to be solved urgently by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model provides a seat angle modulation ware core piece, including chute board and ratchet, still include two first sliders and two second sliders, each the outer tip of slider have with the tooth structure of ratchet meshing of ratchet, the chute board has the inner chamber, the circumference interval of inner chamber is equipped with four bosss, forms the spout between the adjacent boss, the conformal formation of four spouts is in order to hold two respectively first sliders and two second sliders, two first sliders, two second sliders all are relative the central symmetry of chute board; the boss is a special-shaped boss, the outer wall surface of the special-shaped boss comprises at least two sections of arc surfaces with different diameters, or/and the inner wall surface of the special-shaped boss comprises at least two sections of arc surfaces with different diameters.

Compared with the prior art that the lug boss on the chute plate is fan-shaped, the utility model adopts the special-shaped lug boss structure, can realize higher use strength of the chute plate with smaller lug boss volume, thereby increasing the width of the slide block, greatly increasing the number of teeth meshed with the ratchet wheel, increasing the meshing area, having higher meshing strength, greatly improving the overall strength of the chute plate by the special-shaped lug boss with the structure, further improving the strength of the core piece of the seat angle adjuster, and tests prove that the strength of the core piece of the seat angle adjuster with the structure of the utility model is more than 30 percent higher than that of the prior art under the premise of the same volume and the same material, for the installation space of a common seat, the use strength of 4200N.m can be achieved by using the seat angle adjuster core made of common materials, and on the premise that the use strength is met, the use cost is greatly reduced.

Optionally, along the circumferential direction, the outer wall surface of the special-shaped boss comprises a first arc surface, a second arc surface and a third arc surface which are sequentially connected, wherein the first arc surface and the third arc surface have the same diameter and are convexly curved outwards, and the second arc surface is inwardly curved relative to the other two arc surfaces; or,

along circumference, the outer wall of abnormal shape boss is including the first cambered surface, second cambered surface and the third cambered surface that meet in proper order, wherein first cambered surface with the diameter of third cambered surface is the same and the evagination is crooked, the second cambered surface is the degree of curvature that the evagination is crooked but its degree of curvature is less than two other cambered surfaces.

Optionally, along the circumferential direction, the inner wall surface of the special-shaped boss includes a fourth arc surface, a fifth arc surface and a sixth arc surface which are connected in sequence, each arc surface is convexly curved outwards, the diameters of the fourth arc surface and the sixth arc surface are the same, and the degree of curvature of the fifth arc surface is greater than that of the other two arc surfaces.

Optionally, a concave part is further arranged at the center of the inner cavity to form a return spring installation cavity, and the peripheral wall of the concave part is provided with at least one groove for installing an outer hook section of the return spring; and the return spring is a planar spring; each special-shaped boss is arranged on the periphery of the concave part, and the plane spring and each sliding block are positioned on the same side of the sliding groove plate.

Optionally, the locking device further comprises a central shaft, a locking cam and an unlocking cam, the center of the concave portion, the return spring and the locking cam are provided with coaxial central through holes for the central shaft to sequentially pass through, the unlocking cam is provided with an inner hole, at least part of shaft section of the locking cam is sleeved in the inner hole of the unlocking cam, and the locking cam and the unlocking cam are located on the opening side of the concave portion.

Optionally, the locking device further comprises a limiting adjustment ring, the limiting adjustment ring is sleeved on the central shaft and located on the outer side of the unlocking cam, the outer diameter of the limiting adjustment ring is larger than the inner hole of the unlocking cam, and the limiting adjustment ring is used for limiting the relative axial movement displacement of the locking cam and the unlocking cam so as to prevent the locking cam from completely separating from the inner hole of the unlocking cam.

Optionally, a limiting boss is arranged on the circumference of the central shaft and used for limiting the extrusion displacement of the locking cam relative to the return spring.

Optionally, the recess through hole is a cylindrical hole, the shaft section of the central shaft located in the recess through hole is a tapered section, the diameter of the tapered section gradually increases from the outer end portion to the inside, the circumferential taper angle α of the tapered section is about 3 °, and the fit clearance between the two is within a predetermined clearance range.

Optionally, the circumferential outer edges of the chute plate and the ratchet wheel are respectively provided with a first annular section and a second annular section which extend oppositely, the inner surface of the first annular section is provided with a first annular surface, the outer surface of the second annular section is provided with a second annular surface, and the second annular surface is in fit with the first annular surface; and ratchets of the ratchet wheel, which are matched with the first pulley and the second pulley, are arranged on the inner peripheral surface of the second ring section.

Furthermore, the utility model also provides a car seat, including articulated seat support and the back of the chair and arrange seat angle modulation ware core between seat support and the back of the chair in, its characterized in that, seat angle modulation ware core adopts above-mentioned arbitrary seat angle modulation ware core.

Since the seat recliner core has the technical effects described above, a seat comprising the seat recliner core also has the same technical effects, and will not be described herein again.

Drawings

Fig. 1 is a schematic structural view of a seat recliner core according to an embodiment of the present invention;

FIG. 2 is a schematic three-dimensional structure of the chute plate of FIG. 1;

FIG. 3 is a schematic top view of the chute plate of FIG. 2;

FIG. 4 is an enlarged view of a portion A of FIG. 3;

FIG. 5 is a top view of the assembly of the chute plate, the ratchet, the first slider, and the second slider according to an embodiment of the present invention;

FIG. 6 is a schematic three-dimensional view of the central shaft of FIG. 1;

FIG. 7 is a schematic view of the center shaft and return spring assembly according to an embodiment of the present invention;

fig. 8 is a schematic view of the assembly of the center shaft, locking cam and return spring according to an embodiment of the present invention;

fig. 9 is a schematic structural view of an unlocking cam according to an embodiment of the present invention;

fig. 10 is a top view of an assembled unlocking cam and locking cam according to an embodiment of the present invention.

Wherein, in fig. 1 to 10:

1-a chute plate, 1 a-a central through hole, 11-a special-shaped boss, 111-a first arc surface, 112-a second arc surface, 113-a third arc surface, 114-a fourth arc surface, 115-a fifth arc surface, 116-a sixth arc surface, 12-an inner cavity, 121-a concave part, 121 a-a groove, 122-a chute, 13-a first annular section and 131-a first annular surface;

21-a first slide, 22-a second slide;

3-ratchet wheel, 4-central shaft, 41-limit boss, 5-locking cam, 6-unlocking cam, 6 a-inner hole, 61-special-shaped hole, 7-limit adjusting ring 7, 8-sheath, 9-return spring and 91-outer hook section.

Detailed Description

The specific structure of the seat angle adjuster core piece in the prior art is researched, the seat angle adjuster core piece mainly has a double-slider double-wedge structure and is limited by the limitation of the installation space of the core piece, and the meshing strength of the slider teeth made of conventional alloy steel materials is basically 3500N.m (Newton. m). This requires a minimum of 4000n.m for use of the recliner core for a rear row free standing seat, which greatly limits the applications for which conventional material seat recliner cores are used.

In view of the above, it is therefore found that a seat recliner core that is strong and relatively low cost to use is further explored herein.

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 10, the seat recliner core may include a sheath 8, a ratchet 3, an unlocking cam 6, a slider, a locking cam 5, a center shaft 4, a return spring and a sliding groove 122 plate 1.

Usually, the ratchet 3 of the seat angle adjuster is fixed with the back of the automobile and the chute 122 plate 1 is fixed with the seat of the automobile. The ratchet 3 can rotate relative to the chute 122 plate 1, thereby adjusting the angle between the chair back and the chair seat.

The unlocking cam 6, the locking cam 5 and the return spring are all provided with a central through hole for the central shaft 4 to penetrate through, and can be driven by the central shaft 4 to rotate, the locking cam 5 can also be positioned in the middle concave part 121 of the sliding chute 122 plate 1, the sliding block is positioned in the sliding chute 122 formed by the inner cavity 12 of the sliding chute 122 plate 1, and the sliding block can only slide in the sliding chute 122 in a reciprocating mode along the radial direction. The outer end of the slider has a tooth structure which engages with the ratchet teeth of the ratchet 3.

The sliding block and the locking cam 5 are provided with mutually matched locking surfaces, during locking, the locking surface of the locking cam 5 is abutted against the locking surface of the sliding block, the tooth structure at the outer end part of the sliding block is meshed with the ratchet of the ratchet wheel 3, and the ratchet wheel 3 cannot rotate relative to the sliding groove 122 plate 1, so that the relative positions of the chair back and the chair seat of the chair are fixed.

During unlocking, when the central shaft 4 applies an external torque opposite to the reset spring, the unlocking cam 6 rotates to drive the sliding block to move inwards in the sliding groove 122, the tooth structure of the sliding block is completely separated from the ratchet, and at the moment, the ratchet wheel 3 can freely rotate relative to the center of the sliding groove 122 plate 1, so that the angle between the chair back and the chair seat can be adjusted as required.

The utility model discloses the quantity of well slider is four, including two first sliders 21 and two second sliders 22, correspondingly, four spout 122 have been arranged along circumference to spout 122 board 1, and wherein, the central symmetry of two first sliders 21, two second sliders 22 homogeneous phases to spout 122 board 1, that is to say, is to arrange 90 degrees between adjacent first slider 21 and the second slider 22.

The chute 122 plate 1 has an inner cavity 12, four bosses are provided at intervals in the circumferential direction of the inner cavity 12, generally, the four bosses are uniformly arranged in the circumferential direction, the included angle between the center lines of two adjacent bosses is 90 degrees, and it is preferable that the bosses have the same structure. The sliding grooves 122 are formed between adjacent bosses, and the four bosses form four sliding grooves 122 to accommodate the two first sliding blocks 21 and the two second sliding blocks 22, respectively, and each sliding block can slide back and forth in the radial direction inside the corresponding sliding groove 122.

The utility model provides a boss is heterotypic boss 11, and this heterotypic boss 11's outer wall includes the cambered surface of two sections at least different diameters, that is to say, the cambered surface of the outer wall non-uniform diameter of heterotypic boss 11, and the outer wall of heterotypic boss 11 is not fan-shaped promptly.

Or/and the inner wall surface of the special-shaped boss 11 comprises at least two sections of arc surfaces with different diameters, and similarly, the inner wall surface of the special-shaped boss 11 is not an arc surface with the same diameter, that is, the inner wall surface of the special-shaped boss 11 is not fan-shaped.

Under the condition of realizing the same intensity, the utility model provides a heterotypic boss 11's volume can the relative ratio less, and the groove width is relatively wider, and correspondingly, the width of slider can be great by the relative ratio, and the tooth width size range of slider can be 16mm ~ 26 mm. Here, the tooth width refers to a width dimension of the slider having teeth provided on the outer portion thereof. This greatly increases the number of teeth to be engaged with the ratchet 3, thereby increasing the engagement area.

Compared with the prior art that the boss on the chute 122 plate 1 is fan-shaped, the utility model adopts the structure of the special-shaped boss 11, which can realize the higher use strength of the chute 122 plate 1 with smaller boss volume, thereby increasing the width of the slider, greatly increasing the number of teeth meshed with the ratchet 3, increasing the meshing area, and greatly improving the overall strength of the chute 122 plate 1 by the special-shaped boss 11 with the structure, thereby improving the strength of the seat angle adjuster core piece, tests prove that under the premise of the same volume and the same material, the strength of the seat angle adjuster core piece with the structure of the utility model is higher than that of the prior art by more than 30 percent, for the installation space of a common seat, the use strength of the seat angle adjuster core piece made of common material can reach 4200N.m, under the premise of meeting the use strength, the use cost is greatly reduced.

In a specific embodiment, along the circumferential direction, the outer wall surface of the special-shaped boss 11 includes a first arc surface 111, a second arc surface 112 and a third arc surface 113 which are connected in sequence, wherein the first arc surface 111 and the third arc surface 113 have the same diameter and are convexly curved outwards, the second arc surface is opposite to the other two arc surfaces in the bending direction, that is, the second arc surface is inwardly curved relative to the other two arc surfaces, and the second arc surface is recessed towards the axial direction of the sliding chute plate 1.

Or, along the circumferential direction, the outer wall surface of the special-shaped boss 11 includes a first arc surface 111, a second arc surface 112 and a third arc surface 113 which are connected in sequence, wherein the first arc surface 111 and the third arc surface 113 have the same diameter and are convexly curved outwards, and the second arc surface is convexly curved outwards but the degree of curvature of the second arc surface is smaller than that of the other two arc surfaces.

Note that, herein, the outer edge of the plate 1 of the chute 122 is defined as outer, and the inner edge thereof is defined as inner.

As seen from the figure, the outer wall surface of the special-shaped boss 11 is in an arch structure. The diameter of the second arc surface 112 may be substantially equal to the diameter of the other two arc surfaces, wherein the first arc surface 111 and the third arc surface 113 may be symmetrical with respect to the central radial plane of the boss.

Further, in the circumferential direction, the length of the first cambered surface 111, the length of the second cambered surface 112, and the length of the third cambered surface 113 may be substantially equal.

Of course, the lengths of the first arc surface 111, the second arc surface 112, and the third arc surface 113 may also be different, and the size of each arc surface may be determined according to simulation, so as to achieve the maximum structural strength of the chute 122 plate 1.

Further, on the basis of the above embodiment, along the circumferential direction, the inner wall surface of the special-shaped boss 11 includes a fourth arc surface 114, a fifth arc surface 115 and a sixth arc surface 116 which are connected in sequence, each arc surface is convexly curved outwards, wherein the diameters of the fourth arc surface 114 and the sixth arc surface 116 are the same, the degree of curvature of the fifth arc surface 115 is greater than that of the other two arc surfaces, that is, the fifth arc surface protrudes outwards relative to the other two adjacent arc surfaces.

It is emphasized that the same diameters as described herein are meant to be substantially the same, and not merely the exact same.

Preferably, the first arc surface 111, the third arc surface 113, the fourth arc surface 114, the fifth arc surface 115 and the sixth arc surface 116 in the above embodiments may be the same circle center, and the circle center may be the center of the board 1 of the chute 122.

Practice proves that the special-shaped boss 11 with the structure has high use strength and a relatively simple processing technology.

In the above embodiments, the central position of the inner cavity 12 of the plate 1 of the chute 122 may further be provided with a recess 121 to form a return spring installation cavity, and the peripheral wall of the recess 121 is provided with at least one groove 121a for installing the outer hook segment 91 of the return spring 9; the number of the grooves 121a may be two, and two grooves are symmetrically arranged with respect to the center of the chute 122 plate 1, but of course, the number of the grooves may be three or more, and the grooves are uniformly arranged in the circumferential direction.

The return spring 9 in the above embodiment may be a flat spring; the outer hook section 91 of the flat spring is installed inside the groove 121a, so that the return spring 9 can be compressed when the central shaft 4 rotates, the stress of the flat spring is balanced, and the movement of the sliding block can be more stable.

Wherein, the interference fit of outer hook section 91 and recess can be realized through multiple mode, comparatively portably, the size of outer hook section 91 slightly is greater than the size of recess, during the assembly, extrudees outer hook section 91 inside getting into the recess.

The plane spring is installed inside the recess of concave part 121 among this embodiment to reply spring 9 and each slider be in same one side of spout 122 board 1, and the plane spring lies in spout 122 board 1 and the structure that locking cam 5 encloses inside promptly, and this and prior art in set up positioning hole on spout 122 board 1 and compare, the utility model discloses well reply spring 9's installation can avoid outside baking finish to flow in the inside of angle modulation ware core, and core each part does not receive the influence of medium such as outside baking finish promptly, can improve core work reliability.

The different-shaped bosses 11 are provided on the outer periphery of the recess 121, that is, the different-shaped bosses 11 are provided on the cavity wall of the cavity 12 other than the recess 121.

In the above embodiments, the center of the recess 121, the locking cam 5 and the unlocking cam 6 are provided with coaxial central through holes for the central shaft 4 to pass through, fig. 2 shows the central through hole 1a provided on the recess, the return spring 9 is nested in the central shaft 4, the locking cam 5 and the unlocking cam 6 are located at the opening side of the recess 121, and after installation, at least part of the shaft section of the locking cam 5 is nested in the inner hole 6a of the unlocking cam 6. That is, the locking cam 5 may be completely located in the inner hole 6a of the unlocking cam 6, but of course, the locking cam 5 may also be partially located in the inner hole of the unlocking cam 6, and the central shaft 4 passes through the unlocking cam 6 from the inside of the through hole of the locking cam 5.

That is to say, along the axial, locking cam 5 and unlocking cam 6 have the installation space coincidence of partial shaft section at least, can save axial installation space greatly, are favorable to the core to reduce the volume, are favorable to the core to be applied to little space environment, improve and use the flexibility.

In order to avoid the phenomenon that the spring is damaged due to the excessive pressing of the return spring 9, the following arrangement is also made herein.

The central shaft 4 of each of the above embodiments is provided with a limit boss 41 in the circumferential direction for limiting the pressing displacement of the locking cam 5 with respect to the return spring 9 to avoid excessive pressing of the return spring 9. During the movement of the locking cam 5 towards the return spring 9, when it moves to the limit boss position, the locking cam 5 cannot move further in the axial direction under the limit of the limit boss 41.

The structure of the limit boss can be various, and the limit boss can be a step surface processed on the peripheral surface of the central shaft 4, and can also be welded or formed on other structures on the surface of the limit boss.

In each of the above embodiments, the seat angle adjuster core may further include a limiting adjustment ring 7, the limiting adjustment ring 7 is sleeved on the central shaft 4 and located outside the unlocking cam 6, an outer diameter of the limiting adjustment ring 7 is larger than an inner hole of the unlocking cam 6, and the limiting adjustment ring 7 is configured to limit relative axial movement displacement of the locking cam 5 and the unlocking cam 6, so as to prevent the locking cam 5 from completely separating from the inner hole of the unlocking cam 6.

It should be noted that, by defining the direction away from the plate 1 of the sliding chute 122 as outward, the limit adjusting ring 7 can define the relative axial position between the locking cam 5 and the unlocking cam 6 during unlocking or locking, so as to prevent the two from being completely separated and prevent the core of the seat recliner from being stuck during use.

In the above embodiments, the through hole of the concave portion 121 is a cylindrical hole, the shaft section of the central shaft 4 in the through hole of the concave portion 121 is a tapered section, the diameter of the tapered section gradually increases from the outer end portion to the inner side, the circumferential taper angle α is about 3 °, and the fit clearance between the tapered section and the circumferential taper angle α is within a predetermined clearance range, which can be set according to the specific book environment as long as the normal operation of the core member can be satisfied.

Bosses are arranged on the first sliding block 21 and the second sliding block 22; the unlocking cam 6 is provided with four sections of special-shaped holes 61 which are respectively matched with the bosses of the two first sliding blocks 21 and the bosses of the two second sliding blocks 22, so that the unlocking cam 6 drives the first sliding blocks 21 and the second sliding blocks 22 to translate radially when rotating.

The unlocking cam 6 is matched with the boss of the sliding block through the special-shaped hole 61 to drive the sliding block to move along the radial direction, wherein the specific structure of the special-shaped hole 61 is not the core point of the utility model, which can refer to the design of the prior art.

That is, the first slider 21 and the second slider 22 are provided with protrusions, and obviously, the unlocking cam 6 is provided with four sections of special-shaped holes 61 to match with the protrusions of the four sliders respectively.

In a specific scheme, the structures of the inner end surfaces of the first slider 21 and the second slider 22 are symmetrical, the structure of the first slider 21 can be understood by referring to fig. 1, and the second slider 22 corresponds to the first slider, and the difference between the two is that one more protrusion is arranged on the second slider 22.

Therefore, the inner end face of the sliding block is designed to be of a symmetrical structure in the scheme, so that the structure of the sliding block is symmetrical, only one sliding block die is needed during production, the problem of wrong assembly cannot exist during assembly, on one hand, the production cost is reduced, and on the other hand, the assembly efficiency and the assembly reliability are improved.

Because the outer end of slider is the tooth structure with ratchet 3 complex, and the inner is the fitting surface with locking cam 5 complex, in the existing design, the inner of slider is asymmetric structure usually, and the both sides of seat all are equipped with the angle modulation ware, like this, just need distinguish the slider structure and be the part of the left angle modulation ware of seat, still be the part of the angle modulation ware on seat right side, so, not only increased mould quantity, and do when assembling and mix easily, if the slider dress of the left and right sides is anti-reverse, then can lead to the angle modulation ware to become invalid.

The utility model discloses in adopt four slider structures, can carry out following setting with the cooperation mode of spout 122 board 1 and ratchet 3.

The circumferential outer edges of the chute 122 plate 1 and the ratchet 3 are respectively provided with a first annular section 13 and a second annular section which extend oppositely, the inner surface of the first annular section 13 is provided with a first annular surface 131, the outer surface of the second annular section is provided with a second annular surface, and the second annular surface is in fit with the first annular surface; ratchets of the ratchet wheel 3, which are matched with the first pulley and the second pulley, are arranged on the inner circumferential surface of the second ring section.

Just because the installation and fixation of the chute 122 plate 1 and the ratchet wheel 3 are realized through the matching between the first annular surface and the second annular surface, the installation and fixation are simple and convenient, and the weight of the seat angle adjuster core piece can be further reduced.

On the basis of above-mentioned seat angle modulation ware core, the utility model also provides a car seat, including articulated seat support and the back of the chair and arrange the seat angle modulation ware core between seat support and the back of the chair in, seat angle modulation ware core adopts the seat angle modulation ware core in any embodiment of the aforesaid.

Since the seat recliner core has the technical effects described above, a seat comprising the seat recliner core also has the same technical effects, and will not be described herein again.

It is right above that the utility model provides a car seat and seat angle modulation ware core has carried out the detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (10)

1. A seat angle adjuster core piece comprises a sliding groove plate (1) and a ratchet wheel (3), and is characterized by further comprising two first sliding blocks (21) and two second sliding blocks (22), wherein the outer end portion of each sliding block is provided with a tooth structure meshed with a ratchet of the ratchet wheel (3), the sliding groove plate (1) is provided with an inner cavity, four bosses are arranged at intervals in the circumferential direction of the inner cavity, sliding grooves (122) are formed between adjacent bosses, four sliding grooves (122) are formed in a conformal mode to accommodate the two first sliding blocks (21) and the two second sliding blocks (22) respectively, and the two first sliding blocks (21) and the two second sliding blocks (22) are symmetrical relative to the center of the sliding groove plate (1); the boss is a special-shaped boss (11), the outer wall surface of the special-shaped boss (11) comprises at least two sections of arc surfaces with different diameters, or/and the inner wall surface of the special-shaped boss (11) comprises at least two sections of arc surfaces with different diameters.

2. The seat recliner core according to claim 1 wherein the outer wall surface of the profiled boss (11) comprises a first arc surface (111), a second arc surface (112) and a third arc surface (113) which are connected in sequence along the circumferential direction, wherein the first arc surface (111) and the third arc surface (113) have the same diameter and are convexly curved outwards, and the second arc surface (112) is inwardly curved relative to the other two arc surfaces; or,

along circumference, the outer wall face of heterotypic boss (11) is including the first cambered surface (111), second cambered surface (112) and third cambered surface (113) that meet in proper order, wherein first cambered surface (111) with the diameter of third cambered surface (113) is the same and the evagination is crooked, second cambered surface (112) are to the evagination bending but the bending degree of its bending degree is less than the bending degree of two other cambered surfaces.

3. The seat recliner core according to claim 2 wherein an inner wall surface of the profile boss (11) includes a fourth arc surface (114), a fifth arc surface (115) and a sixth arc surface (116) which are connected in sequence in a circumferential direction, each of the arc surfaces is convexly curved outward, wherein the fourth arc surface (114) and the sixth arc surface (116) have the same diameter, and the degree of curvature of the fifth arc surface (115) is greater than that of the other two arc surfaces.

4. The seat recliner core according to any one of claims 1 to 3 wherein said inner cavity center position is further provided with a recess to form a return spring mounting cavity, a peripheral wall of said recess (121) being provided with at least one groove (121a) for mounting an outer hook section (91) of a return spring (9); and the return spring (9) is a planar spring; the special-shaped bosses (11) are arranged on the periphery of the concave part (121), and the planar springs and the sliders are positioned on the same side of the chute plate (1).

5. The seat recliner core according to claim 4 further comprising a center shaft (4), a locking cam (5) and an unlocking cam (6), wherein the center of the recess (121), the return spring (9) and the locking cam (5) are provided with coaxial center through holes for the center shaft (4) to pass through in sequence, the unlocking cam (6) has an inner hole, at least a part of the shaft section of the locking cam (5) is sleeved in the inner hole of the unlocking cam (6), and the locking cam (5) and the unlocking cam (6) are located at the opening side of the recess (121).

6. The seat recliner core according to claim 5 further comprising a limit adjusting ring (7), wherein the limit adjusting ring (7) is sleeved on the central shaft (4) and located outside the unlocking cam (6), the outer diameter of the limit adjusting ring (7) is larger than the inner hole of the unlocking cam (6), and the limit adjusting ring (7) is used for limiting the relative axial movement displacement of the locking cam (5) and the unlocking cam (6) so as to prevent the locking cam (5) from completely separating from the inner hole of the unlocking cam (6).

7. Seat recliner core according to claim 5, characterized in that said central shaft (4) is circumferentially provided with a limit stop (41) for limiting the pressing displacement of said locking cam (5) with respect to said return spring (9).

8. The seat recliner core according to claim 5 wherein said recess through hole is a cylindrical hole and said shaft section of said center shaft (4) located in said recess through hole is a tapered section having a diameter gradually increasing from an outer end portion inwardly and a circumferential taper angle α of about 3 ° and a fitting clearance therebetween within a predetermined clearance range.

9. The seat recliner core according to any one of claims 1 to 3 wherein the circumferential outer edges of said runner plate (1) and said ratchet (3) have oppositely extending first and second annular segments, respectively, the inner surface of said first annular segment (13) having a first annular surface (131) and the outer surface of said second annular segment having a second annular surface, said second annular surface being in abutting engagement with said first annular surface (131); and ratchets of the ratchet wheel (3), which are matched with the first sliding block and the second sliding block, are arranged on the inner peripheral surface of the second ring section.

10. A car seat comprising a hinged seat and back and a seat recliner core disposed between the seat and back, wherein the seat recliner core employs a seat recliner core as claimed in any one of claims 1 to 9.