CN219133936U

CN219133936U - Locking device for automobile seat armrest

Info

Publication number: CN219133936U
Application number: CN202320276639.7U
Authority: CN
Inventors: 付斌
Original assignee: Chongqing Honghui Auto Parts Co ltd
Current assignee: Chongqing Honghui Auto Parts Co ltd
Priority date: 2023-02-21
Filing date: 2023-02-21
Publication date: 2023-06-06
Anticipated expiration: 2033-02-21

Abstract

The utility model discloses a locking device of an automobile seat armrest, which comprises an inner housing, a fixed ratchet ring, an outer housing, a rotating shaft, a labyrinth limiting piece and a driving disc, wherein a locking ratchet plate is arranged on the driving disc, an outer ratchet is arranged on the locking ratchet plate, a transition hole is arranged on the fixed ratchet ring, an inner ratchet matched with the outer ratchet is arranged on the inner side wall of the transition hole, a ratchet plate spring capable of driving the locking ratchet plate to rotate is arranged between the locking ratchet plate and the driving disc, a limiting column is arranged on the locking ratchet plate, a labyrinth groove for the limiting column to extend into after passing through the transition hole is arranged on the labyrinth limiting piece, one end of the labyrinth groove is provided with a limiting column embedding groove, the limiting column embedding groove is connected with the labyrinth groove through the transition groove, and the width of the transition groove is in interference fit with the limiting column. Not only can the armrests hover in the air of the seat to play a supporting role, but also the armrests can be stabilized on the side surface of the seat after rotating to the side surface of the seat, so that passengers can get in and out conveniently.

Description

Locking device for automobile seat armrest

Technical Field

The utility model belongs to the technical field of automobile seat accessories, and particularly relates to a locking device of an automobile seat armrest.

Background

To improve the comfort of a seat while sitting, rotatable armrests are typically provided beside the seat for the passengers to support. In order to reduce the structure of the armrests, the armrests are arranged on two sides of a front seat, two sides of a middle seat or the middle part of a rear seat of an automobile through an armrests adjusting structure, so that the armrests can be put down according to actual requirements to block the body from moving sideways and supporting hands, or the armrests are turned upwards, so that the space of the side face of the seat is enlarged and passengers can get in and out conveniently.

When the armrest is installed, one end is connected to the middle lower part of the side surface of the chair back through the rotating shaft, and the other end is freely arranged and can rotate around the rotating shaft at the connecting part. In order to ensure that the armrest can rotate and stop in the air to play a supporting role after rotating upwards, meanwhile, when the armrest rotates to the side face of the seat, the side face of the seat can be stabilized to facilitate passengers to get in and out, in the prior art, the rotating shaft is often a damping rotating shaft, but the damping effect of the rotating shaft can be gradually weakened along with the increase of the use frequency and the use time, at the moment, the armrest can automatically rotate downwards due to vehicle vibration, passenger collision and the like, namely, unintentional change of the armrest at a set position cannot be reliably prevented, and when the armrest rotates to the side face of the seat (namely, the uppermost end of the armrest is vertical at the moment), the armrest can swing due to vehicle vibration or collision of the passengers, namely, the armrest cannot be locked at a vertical position.

Disclosure of Invention

The utility model aims to provide a locking device for an automobile seat armrest, which not only can realize the effect of hovering the armrest in the air of a seat to play a supporting role, but also can stabilize the side surface of the seat after the armrest rotates to the side surface of the seat to facilitate passengers to get in and out.

The technical scheme adopted by the utility model is as follows: the utility model provides a locking means of car seat handrail, includes interior housing, fixed ratchet circle, outer housing and the pivot that is used for driving handrail pivoted that sets gradually, interior housing is close to car seat setting, be provided with the labyrinth locating part that is located interior housing between fixed ratchet circle and the interior housing, be provided with the initiative dish that is located outer housing between outer housing and the fixed ratchet circle, the one end of pivot passes outer housing, initiative dish, fixed ratchet circle, labyrinth locating part and interior housing in proper order, and the pivot can drive initiative dish rotation, be provided with on the initiative dish towards fixed ratchet circle and be curved locking ratchet board, and be provided with outer ratchet on the lateral wall that keeps away from initiative dish center on the locking ratchet board, be provided with the transition hole that is used for holding locking ratchet board on the inside wall of transition hole, be provided with between locking ratchet board and the initiative dish and can drive locking ratchet relatively initiative dish pivoted leaf spring, be provided with on the locking ratchet board towards the inner housing and be curved locking ratchet board towards the guide post, the guide post is passed through to the recess in the limit post, the guide post is passed through to the recess between the recess, the guide post is arranged as the recess is passed through to the recess.

As the preference of above-mentioned scheme, be provided with the locking ratchet board axle towards fixed ratchet circle on the initiative dish, the one end cover of locking ratchet board is established on locking ratchet board axle, be provided with the spring groove that supplies ratchet board spring pivoted on the initiative dish, be provided with in the spring groove and supply ratchet board spring one end male spring mounting hole, be provided with the breach that supplies ratchet board spring other end to install on the other end of locking ratchet board.

Further preferably, the labyrinth groove is close to the side wall of the labyrinth limiting part and is sequentially provided with a first circular arc and a first inclined plane, the first inclined plane is arranged at one end far away from the transition groove, the side wall of the labyrinth groove far away from the labyrinth limiting part is sequentially provided with a second circular arc, a second inclined plane and a third circular arc, and the third circular arc is arranged at one end far away from the transition groove.

Still be provided with the damping locating part between outer housing and the fixed ratchet circle further preferably, be provided with the spacing hole that is used for holding the damping locating part in the outer housing, the bottom in spacing hole is provided with the restriction jack catch, be provided with on the damping locating part and supply restriction jack catch male restriction draw-in groove, the damping locating part is provided with towards fixed ratchet circle and is used for holding the cavity of initiative dish, and is provided with circlip between initiative dish and the damping locating part.

Still preferably, still include spacing jump ring, be provided with the jump ring groove that is used for installing spacing jump ring on the damping locating part, be provided with in the pivot with spacing jump ring complex jump ring locking groove, be provided with the second grade shoulder hole that supplies the pivot to pass through on the maze spacing subassembly, and the one end of second grade shoulder hole towards the inner housing is the tip.

Further preferably, the rotating shaft is provided with non-uniformly distributed external splines, and the driving disc is provided with internal splines matched with the external splines.

Further preferably, a stop groove is further formed in the inner wall of the transition hole, and a stop block capable of being inserted into the stop groove is arranged on one side, facing the fixed ratchet ring, of the labyrinth limiting piece.

Still preferably, the labyrinth limiting piece is provided with a clamping column which faces the inner housing and is used for clamping the rotating shaft, the clamping columns are uniformly provided with three clamping columns along the circumference of the center of the labyrinth limiting piece, which is penetrated by the rotating shaft, and the inner housing is internally provided with a limiting structure for preventing the clamping columns from deforming.

Further preferably, the side walls at two ends of the labyrinth limiting piece are provided with buckles facing the outer housing, the fixed ratchet ring is provided with a transition clamping groove for the buckles to pass through, and the outer housing is provided with a clamping groove for the buckles to insert.

Further preferably, the spring groove and the spring mounting hole are both symmetrically arranged in left-right direction with respect to the axis of the driving disk.

The utility model has the beneficial effects that: through the arrangement of the limit posts and the limit post caulking grooves, the armrests can be ensured to be stable on the side surfaces of the seat when rotating to the left side surface and the right side surface of the seat, thereby facilitating the ingress and egress of passengers; through the arrangement of the toothed plate spring, the outer ratchet and the inner ratchet, the armrest can hover in the air of the seat, so that the armrest can conveniently block the body from lateral movement and support the hand.

Drawings

FIG. 1 is a schematic diagram of the present utility model.

Fig. 2 is an exploded view of the present utility model.

Fig. 3 is a schematic view of the present utility model when the spacing posts are positioned in the spacing caulking groove.

Fig. 4 is a schematic view of the present utility model when the limit post contacts the first arc surface.

Fig. 5 is a schematic view of the present utility model when the limit post contacts the first inclined surface.

Fig. 6 is a schematic view of the present utility model when the inner ratchet teeth are engaged with the outer ratchet teeth.

Fig. 7 is a schematic view of the present utility model when the stopper post contacts the second inclined surface.

Fig. 8 is a schematic view of the present utility model when the limit post contacts the second arc surface.

Detailed Description

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

as shown in fig. 1-2, a locking device of an automobile seat armrest mainly comprises a rotating shaft 1, an inner cover shell 2, an outer cover shell 3, a fixed ratchet ring 4, a labyrinth limiting piece 5, a driving disc 6, a locking ratchet plate 7 and a ratchet plate spring 8, wherein the rotating shaft 1 is used for driving the seat to rotate. The inner housing 2, the fixed ratchet ring 4 and the outer housing 3 are arranged in sequence, the inner housing 2 is arranged close to the automobile seat, and the outer housing 3 is arranged towards the armrests. In order to realize that the outer cover is covered on the inner cover, a group of outer cover screw holes are formed in the edge of the outer cover, a group of fixed gear ring screw holes are formed in the edge of the fixed gear ring corresponding to the cover screw holes, a group of inner cover screw holes are formed in the edge of the inner cover corresponding to the cover screw holes, and bolts sequentially penetrate through the corresponding outer cover screw holes, the fixed gear ring screw holes and the inner cover screw holes and then are screwed on the backrest of the automobile seat during installation.

A labyrinth limiting piece 5 positioned in the inner housing 2 is arranged between the fixed ratchet ring 4 and the inner housing 2, and is fixedly arranged with the fixed ratchet ring, so that the labyrinth limiting piece is convenient to be arranged, and a labyrinth cavity which faces the fixed ratchet ring and is used for accommodating the labyrinth limiting piece is arranged on the inner housing. A driving disc 6 positioned in the outer cover 3 is arranged between the outer cover 3 and the fixed ratchet ring 4, and for facilitating the arrangement of the driving disc, a driving cavity which faces the fixed ratchet ring and is used for accommodating the driving disc is also arranged on the outer cover. One end of the rotating shaft 1 sequentially passes through the outer housing 3, the driving disc 6, the fixed ratchet ring 4, the labyrinth limiting piece 5 and the inner housing 2, and the rotating shaft 1 can drive the driving disc 6 to rotate. Because the rotating shaft needs to pass through the inner housing and the outer housing, the labyrinth cavity and the driving cavity are both provided with stepped holes, the small end of the labyrinth cavity is arranged at one end far away from the outer housing, and the small end of the driving cavity is arranged at one end far away from the inner housing.

The novel ratchet locking device is characterized in that an arc-shaped locking ratchet plate 7 facing the fixed ratchet ring 4 is arranged on the driving disc 6, the circle center of the locking ratchet plate 7 faces the driving disc 6, an outer ratchet 7a is arranged on the side wall, far away from the center of the driving disc 6, of the locking ratchet plate 7, a transition hole 4a for accommodating the locking ratchet plate 7 is arranged on the fixed ratchet ring 4, an inner ratchet 4b matched with the outer ratchet 7a is arranged on the inner side wall of the transition hole 4a, a ratchet plate spring 8 capable of driving the locking ratchet plate 7 to rotate relative to the driving disc 6 is arranged between the locking ratchet plate 7 and the driving disc 6, and through the arrangement of the inner ratchet and the outer ratchet which can be meshed, a ratchet plate spring is arranged, so that when the inner ratchet is matched with the outer ratchet, the whole locking ratchet plate is matched with the fixed gear ring just like a ratchet, the ratchet can realize the locking condition when a rotating shaft in one direction, and unlocking needs to rotate in the opposite axial direction, so that the handrail can hover in the air can be realized, and the supporting effect can be realized.

In order to realize that the armrest can be stabilized when rotating to the side surface of the seat, a limit post 7b facing the inner housing 2 is arranged on the locking ratchet plate 7, a through labyrinth groove 5a is arranged on the labyrinth limit piece 5, the limit post 7b penetrates through the transition hole 4a and then stretches into the labyrinth groove 5a, one end of the labyrinth groove 5a is provided with a limit post caulking groove 5b, meanwhile, the limit post caulking groove 5b is connected with the labyrinth groove 5a through a transition groove 5c, and the width of the transition groove 5c is in interference fit with the limit post 7 b. Because the width of the transition groove 5c is in interference fit with the limit post 7b, when the limit post moves into the limit post caulking groove, the limit post is difficult to move into the labyrinth groove after passing through the transition groove under the action of no external force.

For realizing the function commonly used by armrests, a first arc a and a first inclined plane b are sequentially arranged on the side wall, close to the labyrinth limiting piece 5, of the labyrinth groove 5a, the first inclined plane b is arranged at one end far away from the transition groove 5c, and a second arc c, a second inclined plane d and a third arc e are sequentially arranged on the side wall, far away from the labyrinth limiting piece 5, of the labyrinth groove 5a, wherein the third arc e is arranged at one end far away from the transition groove 5 c.

In order to facilitate passengers to leave the seat, the armrests are rotated to the side of the seat at this time, that is, the armrests are in a vertical state, specifically, the limit posts are located in the limit post caulking grooves, as shown in fig. 3, because the transition grooves are in interference fit with the limit posts, the limit posts cannot move into the labyrinth grooves through the transition grooves under the action of no external force, so that the locking of the state is realized.

When the handrail is manually rotated downwards, namely the rotating shaft, the driving disc and the locking ratchet plate rotate, the limiting column moves into the labyrinth groove after passing through the transition groove, at the moment, due to the action of the ratchet plate spring, the limiting column is in contact with the inner wall of the labyrinth groove, which is close to one side of the center of the labyrinth limiting piece, namely the limiting column is in contact with the first circular arc surface, as shown in fig. 4, the handrail can rotate downwards under the action of gravity, and meanwhile the rotating shaft, the driving disc and the locking ratchet plate continue to rotate, namely the limiting column continues to rotate along the first circular arc. When the limit post rotates to the first inclined plane along the first circular arc, as shown in fig. 5, due to the special arrangement of the first inclined plane, the elasticity of the ratchet plate spring can be continuously increased, when the armrest continues to rotate downwards, the ratchet plate spring can change the position of the ratchet plate spring due to overlarge elasticity, and the elastic direction of the ratchet plate spring is changed, so that one end of the locking ratchet plate is driven to rotate in the direction away from the center of the driving disc, namely, the limit post is away from the inner wall of the labyrinth groove, which is close to one side of the center of the labyrinth limit piece, and the outer ratchet and the inner ratchet are in a meshed state, as shown in fig. 6. Due to the special arrangement of the outer ratchet and the inner ratchet and the arrangement of the ratchet plate spring, the state can be kept under the action of no external force.

Because a plurality of inner ratchets are meshed with the outer ratchets, the handrail can be rotated to different positions, when the angle of the handrail needs to be changed, the handrail needs to be rotated upwards, after the elasticity of the ratchet plate spring is overcome, the limit post is moved to the second inclined plane or to the second arc surface, as shown in fig. 7 and 8, at the moment, the outer ratchets are disengaged from the inner ratchets, then the outer ratchets are rotated downwards until the handrail is rotated to the desired position, and at the stage of downward rotation of the handrail, the outer ratchets can be meshed with the inner ratchets again under the action of the ratchet plate spring.

When the handrail rotates upwards, as one end of the second circular arc, which is close to the transition groove, is gradually close to the center of the labyrinth limiting part, and the position of the transition groove is closest to the labyrinth limiting part, when the handrail rotates to the transition groove, the elastic force of the ratchet plate spring is maximum, when the handrail continues to rotate upwards, the limiting post moves into the embedding groove of the limiting post, the reverse direction of the ratchet plate spring can be changed, the limiting post moves against the inner wall, which is close to the center side of the labyrinth limiting part, of the labyrinth groove, if the handrail rotates downwards, the direction of the ratchet plate spring can not be changed, and the elastic force of the ratchet plate spring can only be reduced.

In order to facilitate the installation of the locking ratchet plate, a locking ratchet plate shaft 6a facing the fixed ratchet ring 4 is arranged on the driving disc 6, and one end of the locking ratchet plate 7 is sleeved on the locking ratchet plate shaft 6 a. In order to facilitate the installation of the ratchet plate spring, a spring groove 6b for the rotation of the ratchet plate spring 8 is arranged on the driving disc 6, a spring installation hole 6c for the insertion of one end of the ratchet plate spring 8 is arranged in the spring groove 6b, and a notch 7c for the installation of the other end of the ratchet plate spring 8 is arranged on the other end of the locking ratchet plate 7.

In order to ensure the stable rotation of the driving disc, a damping limiting part 9 is further arranged between the outer cover shell 3 and the fixed ratchet ring 4, the driving cavity is arranged in the damping limiting part due to the arrangement of the damping limiting part, and an elastic check ring 10 is arranged between the driving disc 6 and the damping limiting part 9. For the installation of convenient damping locating part, be provided with the spacing hole 3a that is used for holding damping locating part 9 in the dustcoat shell 3, be provided with limiting jaw 3b in the bottom of spacing hole 3a, be provided with on the damping locating part 9 and supply limiting jaw 3b male restriction draw-in groove 9a, because the pivot needs to pass the damping locating part, consequently the spacing hole sets up to tertiary shoulder hole, and the one end that the interior encloser was kept away from to the spacing hole is the tip.

In order to prevent the rotating shaft from moving along the axial direction, a limiting clamp spring is further arranged, a clamp spring groove 9b for installing the limiting clamp spring 11 is formed in the damping limiting piece 9, a clamp spring locking groove 1a matched with the limiting clamp spring 11 is formed in the rotating shaft 1, and the limiting clamp spring is used for preventing the rotating shaft from exiting from the locking device. Meanwhile, in order to prevent the rotating shaft from moving towards the locking device along the axis, a secondary stepped hole 5d for the rotating shaft 1 to pass through is arranged on the labyrinth limiting component 5, and meanwhile, one end of the secondary stepped hole 5d, which faces the inner housing 2, is a small end, and preferably, the shaft shoulder of the secondary stepped hole is an inclined plane.

In order to ensure that the rotation energy drives the driving disc to rotate, the rotating shaft 1 is provided with non-uniformly distributed external splines 1b, and meanwhile, the driving disc 6 is provided with internal splines 6d matched with the external splines 1 b.

In order to ensure that the labyrinth limiting piece cannot rotate, a stop groove 4c is further formed in the inner wall of the transition hole 4a, and a stop block 5e which can be inserted into the stop groove 4c is arranged on one side, facing the fixed ratchet ring 4, of the labyrinth limiting piece 5.

To further limit the clearance, a clamping post 5f is provided on the labyrinth limiter 5, which faces the inner housing 2 and is used for clamping the rotating shaft 1, and the clamping posts 5f are uniformly provided with three circumferentially along the center of the labyrinth limiter, through which the rotating shaft 1 passes, while a limiting structure is provided in the inner housing 2 for preventing the clamping posts 5f from deforming. The restriction structure is to set the labyrinth space as a three-stage stepped hole, wherein a second stage of steps is used for preventing the clamping column from deforming.

Because the inner cover shell is arranged on the seat, in order to facilitate the installation of the whole device, other parts can be arranged in the outer cover shell, the outer cover shell is arranged on the inner cover shell, and the labyrinth limiting piece is required to be arranged and cannot be separated from the outer cover shell, so that the two end side walls of the labyrinth limiting piece 5 are provided with buckles 5g which face the outer cover shell 3, the fixed ratchet ring 4 is provided with a transition clamping groove 4d for the passage of the buckles 5g, and the outer cover shell 3 is provided with a clamping groove 3c for the insertion of the buckles 5 g.

Since the armrest is not only arranged on the left side of the seat, but also possibly on the right side of the seat, and is arranged on the left side and the right side at the same time, only the rotation direction of the armrest, that is, the rotation direction of the limit post is different, in order to reduce the number of parts, two spring grooves 6b and spring mounting holes 6c are symmetrically arranged on the driving disk.

In order to reduce the weight, the damping limiting part and the labyrinth limiting part are made of nonmetallic materials.

Claims

1. The utility model provides a locking device of car seat handrail, includes pivot (1) that are used for driving the handrail rotation, its characterized in that: still including setting gradually interior housing (2), fixed ratchet circle (4) and dustcoat shell (3), interior housing (2) are close to car seat setting, be provided with between fixed ratchet circle (4) and the interior housing (2) and lie in maze locating part (5) of interior housing (2), be provided with between dustcoat shell (3) and fixed ratchet circle (4) and lie in initiative dish (6) of dustcoat (3), the one end of pivot (1) passes outer housing (3), initiative dish (6), fixed ratchet circle (4), maze locating part (5) and interior housing (2) in proper order, and pivot (1) can drive initiative dish (6) rotation, be provided with on initiative dish (6) towards fixed ratchet circle (4) and be curved locking ratchet board (7), and the centre of a circle of locking ratchet board (7) is towards initiative dish (6) setting, be provided with outer ratchet (7 a) on the lateral wall that keeps away from initiative dish (6) center on locking ratchet board (7), be provided with on fixed ratchet circle (4) and be used for holding ratchet (4) inside wall (4) that transition hole (4 a) can be provided with on the transition hole (4 b), the novel anti-theft device is characterized in that a ratchet plate spring (8) capable of driving the ratchet plate (7) to rotate relative to the driving disc (6) is arranged between the ratchet plate (7) and the driving disc (6), a limit column (7 b) facing the inner housing (2) is arranged on the ratchet plate (7), a through labyrinth groove (5 a) is arranged on the labyrinth limiting piece (5), the limit column (7 b) penetrates through the transition hole (4 a) and then stretches into the labyrinth groove (5 a), one end of the labyrinth groove (5 a) is provided with a limit column caulking groove (5 b), the limit column caulking groove (5 b) is connected with the labyrinth groove (5 a) through a transition groove (5 c), and the width of the transition groove (5 c) is in interference fit with the limit column (7 b).

2. The locking device of an automotive seat armrest as set forth in claim 1, wherein: the ratchet plate locking device is characterized in that a locking ratchet plate shaft (6 a) facing the fixed ratchet ring (4) is arranged on the driving disc (6), one end of the locking ratchet plate (7) is sleeved on the locking ratchet plate shaft (6 a), a spring groove (6 b) for allowing the ratchet plate spring (8) to rotate is formed in the driving disc (6), a spring mounting hole (6 c) for allowing one end of the ratchet plate spring (8) to be inserted is formed in the spring groove (6 b), and a notch (7 c) for allowing the other end of the ratchet plate spring (8) to be mounted is formed in the other end of the locking ratchet plate (7).

3. The locking device of an automotive seat armrest as set forth in claim 1, wherein: the labyrinth groove (5 a) is close to the side wall of the labyrinth limiting part (5) and is sequentially provided with a first arc (a) and a first inclined plane (b), the first inclined plane (b) is arranged at one end far away from the transition groove (5 c), the labyrinth groove (5 a) is sequentially provided with a second arc (c), a second inclined plane (d) and a third arc (e), and the third arc (e) is arranged at one end far away from the transition groove (5 c).

4. The locking device of an automotive seat armrest as set forth in claim 1, wherein: still be provided with damping locating part (9) between dustcoat shell (3) and fixed ratchet circle (4), be provided with in dustcoat shell (3) and be used for holding spacing hole (3 a) of damping locating part (9), the bottom of spacing hole (3 a) is provided with restriction jack catch (3 b), be provided with on damping locating part (9) and supply restriction jack catch (3 b) male restriction draw-in groove (9 a), damping locating part (9) are provided with towards fixed ratchet circle (4) and are used for holding the cavity of initiative dish (6), and are provided with circlip (10) between initiative dish (6) and the damping locating part (9).

5. The locking device of an automotive seat armrest as set forth in claim 4, wherein: still including spacing jump ring (11), be provided with jump ring groove (9 b) that are used for installing spacing jump ring (11) on damping locating part (9), be provided with on pivot (1) with spacing jump ring (11) complex jump ring locking groove (1 a), be provided with on maze locating part (5) and supply pivot (1) second grade shoulder hole (5 d) through, and second grade shoulder hole (5 d) are the tip towards the one end of inner cover shell (2).

6. The locking device of an automotive seat armrest as set forth in claim 1, wherein: the rotating shaft (1) is provided with non-uniformly distributed external splines (1 b), and the driving disc (6) is provided with internal splines (6 d) matched with the external splines (1 b).

7. The locking device of an automotive seat armrest as set forth in claim 1, wherein: the inner wall of the transition hole (4 a) is also provided with a stop groove (4 c), and one side of the labyrinth limiting piece (5) facing the fixed ratchet ring (4) is provided with a stop block (5 e) which can be inserted into the stop groove (4 c).

8. The locking device of an automotive seat armrest as set forth in claim 1, wherein: be provided with on labyrinth locating part (5) towards interior housing (2) and be used for pressing from both sides tight post (5 f) of tight pivot (1), it evenly is provided with three to press from both sides tight post (5 f) along the center that supplies pivot (1) to pass on the labyrinth locating part to be the circumference, be provided with the limit structure that is used for preventing to press from both sides tight post (5 f) deformation in interior housing (2).

9. The locking device of an automotive seat armrest as set forth in claim 1, wherein: the labyrinth limiting piece is characterized in that buckles (5 g) facing the outer cover shell (3) are arranged on the side walls of the two ends of the labyrinth limiting piece (5), transition clamping grooves (4 d) for the buckles (5 g) to pass through are formed in the fixed ratchet ring (4), and clamping grooves (3 c) for the buckles (5 g) to insert are formed in the outer cover shell (3).

10. The locking device of an automotive seat armrest as set forth in claim 2, wherein: the spring grooves (6 b) and the spring mounting holes (6 c) are symmetrically arranged in left-right mode relative to the axis of the driving disc (6).