Angle adjusting mechanism
Technical Field
The invention belongs to the technical field of seat adjustment, and particularly relates to an angle adjusting mechanism.
Background
The recliner is mainly applied to car seats to adjust the inclination angle of the backrest of the seat, and currently, the recliner can be divided into three categories: one is a locking adjusting mechanism adopting a ratchet and pawl mechanism principle, the other is a gear type adjusting mechanism adopting a planetary gear transmission principle, and the other is an eccentric adjusting mechanism adopting a small tooth difference planetary gear transmission principle.
The three types of angle adjusters have advantages and disadvantages in performance, wherein the ratchet and pawl mechanism has the defects of limited adjusting range, limited strength, large gap, limited adjusting precision and the like; the planetary gear transmission adjusting mechanism has the defects of limited strength, large gap, large volume and the like; the eccentric adjusting mechanism of the planetary gear transmission principle with small tooth difference has the defects of non-concentric transmission, unsmooth operation, incapability of being used for monotone and the like.
With the advent of new application scenes such as various spaces in an automatic driving vehicle, intelligent furniture, office furniture and the like, market demands of angle adjusters, particularly concentric angle adjusters, are gradually expanding, for example, the angle adjusters are applied to scenes such as armrests, leg supports, seat height adjustment, electric sofas and the like.
Disclosure of Invention
In view of the above, the invention provides an angle adjusting mechanism which has small external dimension, compact structure, concentric transmission realization and wide application range.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
an angle adjustment mechanism, its key lies in: the device comprises a fixed disc, a sliding block, a fluted disc and a movable disc which are sequentially arranged along the axial direction, wherein the movable disc can concentrically rotate relative to the fixed disc; an inner gear ring is arranged on the movable disc, outer teeth meshed with the inner gear ring are arranged on the fluted disc, and the number of teeth of the outer teeth is smaller than that of the inner gear ring; the sliding block is in sliding fit with the fixed disc, the fluted disc is in sliding fit with the sliding block, and an included angle is formed between the sliding direction of the sliding block relative to the fixed disc and the sliding direction of the fluted disc relative to the sliding block; the movable disc is provided with a mounting hole, a driving shaft is mounted in the mounting hole in an eccentric rotation mode, and the driving shaft stretches into a central hole of the fluted disc and is used for driving the fluted disc to move.
By adopting the structure, when the angle adjusting mechanism works, the fluted disc is connected with the fixed disc through the sliding block, and moves along the horizontal direction and the longitudinal direction relative to the fixed disc, namely: the rotation of fluted disc has been locked, so, under the eccentric drive of drive axle, the external tooth of fluted disc translates along the ring gear circumference of movable plate to drive the movable plate rotation, namely: the concentric transmission of the angle adjusting mechanism is realized. Meanwhile, the angle adjusting mechanism is compact in structure, few in parts and capable of achieving the diameter within 50mm, and has good supporting strength.
As preferable: the fluted disc is close to one side of movable disc and is equipped with annular boss, and annular boss eccentric mounting is in the mounting hole, and be formed with annular assembly groove between annular boss and the mounting hole, be equipped with arc piece and two sets of wedge in the annular assembly groove, wherein the arc piece with the drive shaft rigid coupling, two sets of install elastic element between the wedge, elastic element exerts the power that makes the wedge move towards the arc piece direction. By adopting the structure, the fluted disc is eccentrically arranged relative to the movable disc, and the meshing transmission of the external teeth and the annular gear can be ensured under the eccentric driving of the driving shaft. Under the non-working condition, the elastic element forces the two groups of wedge blocks to be clamped more tightly in the annular assembly groove, and the circumferential gap between the movable disc and the fixed disc can be eliminated, so that the seat backrest is prevented from shaking, and the comfort and the stability of the seat are improved.
As preferable: the arc-shaped block has an annular connecting portion and is fixedly assembled to the drive shaft through the annular connecting portion. By adopting the structure, the arc-shaped block is fixedly connected with the driving shaft so as to avoid the annular boss, and the assembly of products is facilitated.
As preferable: the two ends of the driving shaft respectively penetrate out of the fixed disc and the movable disc, stop flanges extending outwards along the radial direction are arranged at positions corresponding to the outer sides of the fixed disc, and lock covers are arranged at positions corresponding to the outer sides of the movable disc. By adopting the structure, the angle adjusting mechanism is convenient to assemble, and the compactness of the structure of the angle adjusting mechanism after assembly can be ensured.
As preferable: the drive shaft is equipped with spacing plane on being close to the periphery of the one end of locking closure, be equipped with first connecting hole on the annular connecting portion, be equipped with the second connecting hole on the locking closure, first connecting hole and second connecting hole all cup joint on the drive shaft, and all be equipped with the plane section that suits with spacing plane on the pore wall of first connecting hole and second connecting hole, the tip of drive shaft stretches out the second connecting hole to the joint has the anticreep rand. By adopting the structure, on the basis of ensuring the assembly relation among the components, the rapid assembly among the components can be realized.
As preferable: the annular connecting part and the elastic element are both protruded out of the outer side surface of the movable disc, and a flanging extending towards the direction of the movable disc is arranged on the edge of the inner end of the lock cover. By adopting the structure, the lock cover can cover the elastic element and the annular connecting part which are protruded outside, so that the reliability of assembly is ensured.
As preferable: the fixed disk is provided with a positioning hole concentric with the mounting hole, and the driving shaft is provided with a positioning round table in running fit with the positioning hole. By adopting the structure, when the driving shaft eccentrically rotates, the positioning round table concentrically rotates relative to the fixed disc, so that the reliability and stability of transmission can be improved, and the angle adjusting mechanism works more stably.
As preferable: the sliding block is in a cross-shaped structure and is provided with a transverse sliding part and a longitudinal sliding part which are mutually perpendicular, the fixed disc is provided with a transverse sliding groove and a longitudinal sliding groove which are mutually perpendicular, and the transverse sliding part is slidably arranged in the transverse sliding groove; the longitudinal sliding part is provided with longitudinal guide grooves distributed along the length direction of the longitudinal sliding part, and the fluted disc is provided with longitudinal guide convex blocks which are slidably arranged in the longitudinal guide grooves. By adopting the structure, when the driving shaft eccentrically rotates, the transverse sliding part reciprocally slides in the transverse sliding groove, the longitudinal guide lug reciprocally slides in the longitudinal guide groove, and the sliding directions of the longitudinal guide lug and the longitudinal guide lug are vertical, so that the external teeth of the fluted disc can circumferentially move along the annular gear when the angle adjusting mechanism works, and the inclination angle of the backrest of the seat is adjusted. Meanwhile, the structure arrangement can limit the rotation of the fluted disc, and the locking strength of the angle adjusting mechanism is ensured.
As preferable: the transverse sliding part is provided with a positioning groove, and the position of the fluted disc corresponding to the positioning groove is provided with a positioning lug. By adopting the structure, the structure design is reasonable, the assembly of products is facilitated, and the fluted disc can be limited to transversely slide relative to the sliding block, namely, the fluted disc can only slide in one direction relative to the sliding block when the angle adjusting mechanism works.
As preferable: still including the staple bolt of suit at fixed disk and movable disk circumference outside, wherein movable disk and staple bolt fixed connection, fixed disk and staple bolt normal running fit. By adopting the structure, the fixed disc and the movable disc are convenient to concentrically assemble.
Compared with the prior art, the invention has the beneficial effects that:
1. compact structure, high supporting strength, wide application range, and can be used in armrests, leg supports, seat back adjustment, electric sofas and other occasions.
2. In the working process of the angle adjusting mechanism, under the combined action of the sliding block, the fluted disc and other parts, the concentric rotation of the movable disc can be realized, the transmission non-concentricity and the running irregularity are avoided, and the use comfort of the angle adjusting mechanism is effectively improved.
3. The concentric angle adjusting mechanism can be used for double adjustment and monotone, and is beneficial to saving cost and application arrangement space.
4. Under the effect of the elastic element, the two groups of wedge blocks can eliminate the circumferential gap between the movable disc and the fixed disc, so that the seat backrest is prevented from shaking, and the comfort and the stability of the seat are improved.
5. The structural design of the parts is reasonable, and the assembly of the angle adjusting mechanism is easy to realize.
Drawings
FIG. 1 is an exploded view of an angle adjustment mechanism;
FIG. 2 is a schematic view of the angle adjusting mechanism;
FIG. 3 is a cross-sectional view of the angle adjustment mechanism;
FIG. 4 is a schematic view of the exploded construction of the drive shaft, arcuate blocks, wedge blocks, etc.;
FIG. 5 is a schematic structural view of a stator;
FIG. 6 is a schematic diagram of a slider structure;
FIG. 7 is a schematic view of a toothed disc;
FIG. 8 is another cross-sectional view of the angle adjustment mechanism;
FIG. 9 is a schematic view of the structure of the drive shaft;
fig. 10 is a schematic structural view of the locking cap.
Detailed Description
The invention is further described below with reference to examples and figures.
The transverse direction and the longitudinal direction mentioned in the embodiment are based on the directions shown in fig. 5 and 6, and show a relative position relationship perpendicular to each other.
As shown in fig. 1 to 4, an angle adjusting mechanism comprises a fixed disk 1, a sliding block 2, a fluted disc 3 and a movable disk 4 which are sequentially arranged along the axial direction, wherein a hoop 11 is sleeved on the outer side of the circumference of the fixed disk 1 and the circumference of the movable disk 4, the movable disk 4 is fixedly connected with the hoop 11, the fixed disk 1 is in running fit with the hoop 11, and the movable disk 4 rotates coaxially relative to the fixed disk 1 when the angle adjusting mechanism works. An inner gear ring 4a is arranged on the movable disc 4, outer teeth 3a which are meshed with the inner gear ring 4a are arranged on the circumferential outer side of the fluted disc 3, and the number of teeth of the outer teeth 3a is smaller than that of the inner gear ring 4 a. The sliding block 2 is connected between the fixed disk 1 and the fluted disk 3, and the matching relation among the three is as follows: the sliding block 2 is in sliding fit with the fixed disc 1, the fluted disc 3 is in sliding fit with the sliding block 2, and an included angle is formed between the sliding direction of the sliding block 2 relative to the fixed disc 1 and the sliding direction of the fluted disc 3 relative to the sliding block 2, in this embodiment, the included angle is preferably set to 90 degrees, that is, the sliding direction of the sliding block 2 relative to the fixed disc 1 is perpendicular to the sliding direction of the fluted disc 3 relative to the sliding block 2, and besides the preferred included angle of 90 degrees, the included angle can also be set to other angles. The movable disk 4 is provided with a mounting hole 4b, a driving shaft 5 is mounted in the mounting hole 4b in an eccentric rotation mode, and the driving shaft 5 stretches into a central hole 3b of the fluted disk 3 and is used for driving the fluted disk 3 to move.
As shown in fig. 3 and 7, an annular boss 3c is disposed on one side of the fluted disc 3 near the movable disc 4, the annular boss 3c is eccentrically mounted in the mounting hole 4b, an annular assembly groove a is formed between the annular boss 3c and the mounting hole 4b, an arc-shaped block 6 and two groups of wedge-shaped blocks 7 are disposed in the annular assembly groove a, wherein the arc-shaped block 6 is fixedly connected with the driving shaft 5, namely: the arc-shaped blocks 6 can synchronously move along with the driving shaft 5, elastic elements 8 are arranged between the two groups of wedge-shaped blocks 7, the elastic elements 8 are preferably omega-shaped springs, two ends of each elastic element are hung on the corresponding wedge-shaped blocks 7, and under the non-working state of the angle adjusting mechanism, the omega-shaped springs exert force for enabling the wedge-shaped blocks 7 to move towards the arc-shaped blocks 6, so that the two groups of wedge-shaped blocks are forced to be clamped more tightly in the annular assembly groove a, and the design is adopted, so that the circumferential gap between the movable disc 4 and the fixed disc 1 can be eliminated, the rocking of a seat backrest is avoided, and the comfort and the stability of the seat are improved. The elastic element 8 may be replaced by an elastic pad arranged between two sets of wedge blocks 7, in addition to an omega spring.
As shown in fig. 5, 6 and 7, the specific matching structure of sliding between the fixed disk 1, the sliding block 2 and the fluted disk 3 is as follows:
the sliding block 2 is in a cross-shaped structure and is provided with a transverse sliding part 2b and a longitudinal sliding part 2c which are mutually perpendicular, a transverse sliding groove 1b and a longitudinal sliding groove 1c which are mutually perpendicular are arranged on the fixed disk 1, the length of the transverse sliding part 2b is larger than that of the transverse sliding groove 1b, the transverse sliding part is slidably assembled in the transverse sliding groove 1b, the length of the longitudinal sliding part 2c is equal to that of the longitudinal sliding groove 1c, and after the longitudinal sliding part 2c is arranged in the longitudinal sliding groove 1c, the longitudinal sliding part cannot slide along the length direction of the longitudinal sliding groove 1 c; the longitudinal sliding part 2c is provided with longitudinal guide grooves 2d distributed along the length direction of the longitudinal sliding part, the fluted disc 3 is provided with longitudinal guide convex blocks 3d which are slidably arranged in the longitudinal guide grooves 2d, when the angle adjusting mechanism works, the transverse sliding part 2b slides reciprocally in the transverse sliding groove 1b, the longitudinal guide convex blocks 3d slide reciprocally in the longitudinal guide grooves 2d, and the sliding directions of the longitudinal guide convex blocks and the longitudinal guide convex blocks are vertical. By the design, the autorotation of the fluted disc 3 during working can be limited, so that the fluted disc can only translate along the circumferential direction.
The transverse sliding part 2b is provided with a positioning groove 2e, the position of the fluted disc 3 corresponding to the positioning groove 2e is provided with a positioning lug 3e, after the sliding block 2 and the fluted disc 3 are assembled together, the two groups of positioning lugs 3e are positioned in the positioning groove 2e, and the positioning lug 3e cannot slide relative to the length direction of the positioning groove 2e, because the space length of the two groups of positioning lugs 3e is equal to the length of the positioning groove 2 e. The space where the two groups of longitudinal guide convex blocks 3d are located is smaller than the length of the longitudinal guide groove 2d, and the structural layout can ensure that the fluted disc 3 only slides in one direction relative to the sliding block 2 when the angle adjusting mechanism works.
Because concentric angle adjustment mechanism involves spare part more, in prior art, the assembly between each part of angle adjustment mechanism is very difficult, and this embodiment adopts following structural design to make angle adjustment mechanism's assembly easier, specifically:
referring to fig. 3 and 4, since the arc-shaped block 6 is spaced from the driving shaft 5 by an annular boss 3c, for convenience in fixedly connecting the arc-shaped block 6 with the driving shaft 5, an annular connecting portion 6a extending toward the center of the arc-shaped block 6 is provided at the outer end of the inner arc-shaped surface of the arc-shaped block 6, a first connecting hole 6b is provided on the annular connecting portion 6a, and the first connecting hole 6b is fixedly sleeved on the driving shaft 5.
Referring to fig. 1, 8, 9 and 10, after the angle adjusting mechanism is assembled, two ends of the driving shaft 5 respectively penetrate through the fixed disc 1 and the movable disc 4, a stop flange 5a is arranged at a position corresponding to the outer side of the fixed disc 1, a locking cover 9 is arranged at a position corresponding to the outer side of the movable disc 4, a limit plane 5b is arranged on the circumferential surface of one end, close to the locking cover 9, of the driving shaft 5, a second connecting hole 9a is arranged on the locking cover 9, the first connecting hole 6b and the second connecting hole 9a are sleeved on the driving shaft 5, plane sections corresponding to the limit plane 5b are arranged on the hole walls of the first connecting hole 6b and the second connecting hole 9a, and the end part of the driving shaft 5 extends out of the second connecting hole 9a and is clamped with an anti-falling collar 10.
Further, as shown in fig. 8, since the annular connecting portion 6a and the elastic member 8 are protruded from the outer side surface of the movable plate 4 after the angle adjusting mechanism is assembled, a flange 9b extending toward the movable plate 4 is provided on the inner end edge of the lock cover 9 so as to cover the protruded portion.
As shown in fig. 9, the fixed disk 1 is provided with a positioning hole 1a concentric with the mounting hole 4b, and the driving shaft 5 is provided with a positioning round table 5c in rotation fit with the positioning hole 1 a. When the driving shaft 5 eccentrically rotates, the positioning round table 5c concentrically rotates relative to the fixed disc 1, so that the reliability and stability of transmission can be improved, and the angle adjusting mechanism works more stably.
The working principle of the invention applied to the reclining of the backrest is as follows:
the fixed disk 1 is fixed on the seat basin, the movable disk 4 is fixed on the backrest, the output shaft of the driving motor is arranged in the spline inner hole 5e of the driving shaft 5, when the driving motor is not started, namely, in the non-working state of the angle adjusting mechanism, the two groups of wedge blocks 7 are clamped in the annular assembly groove a, the gap between the movable disk 4 and the fixed disk 1 is eliminated, the backrest cannot shake, and the comfort and the stability are good.
When the backrest is required to be subjected to angle adjustment, the driving motor starts to operate and drives the driving shaft 5 to rotate, when the driving shaft 5 just starts to rotate, the arc-shaped blocks 6 can collide on one of the wedge-shaped blocks 7, so that two groups of wedge-shaped blocks 7 are loosened in the annular assembly groove a, then the driving motor continues to drive the driving shaft 5 to eccentrically rotate in the mounting hole 4b of the movable disc 4, under the action of the mutually perpendicular sliding relationship among the fixed disc 1, the sliding blocks 2 and the fluted disc 3, the fluted disc 3 cannot rotate, so that the eccentric rotation of the driving shaft 5 can drive the fluted disc 3 to eccentrically translate along the circumferential direction of the annular gear 4a, and the tooth number of the external teeth 3a of the fluted disc 3 is less than the tooth number of the annular gear 4a, so that the movable disc 4 can concentrically rotate relative to the fixed disc 1 in the circumferential translation process of the annular gear 4a, and the inclination angle adjustment of the backrest of the seat is realized.
Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.