Concentric angle adjuster for car seats with gap-eliminating locking function

Abstract

A concentric angle adjuster for automotive seats with a backlash-eliminating locking function includes a backrest gear plate, a drive shaft, gears, a seat gear plate, and a gear plate control disc. The key feature is the inclusion of an unlocking disc located between the gear plate control disc and the opposing side of the backrest gear plate. A drive shaft transmission hole is centrally located on the unlocking disc. The left end of the drive shaft engages with this hole. A guide boss cavity for the drive shaft transmission hole is located on the hole wall. The left side of the backrest gear plate engages with this guide boss cavity. A backlash-eliminating locking cavity is formed in the middle left region of the seat gear plate. Roller-type rigid backlash-eliminating locking mechanisms are spaced apart on the outer circumferential wall of the backrest gear plate. Advantages: It simultaneously satisfies circumferential rigid locking and circumferential backlash elimination requirements; it simplifies the structure and extends service life; it ensures smooth rotation of the drive shaft, eliminating eccentric offset during adjustment; it provides ideal transmission accuracy and avoids uneven wear.

Description

Technical Field

[0001] This invention belongs to the technical field of automotive seat accessories, specifically relating to a concentric angle adjuster for automotive seats with a gap-eliminating and locking function. Background Technology

[0002] Seat back adjusters come in two types: concentric and eccentric. The former doesn't rotate concentrically around a single point when adjusting the seat back; instead, it rotates with an eccentric offset, accompanied by a slight non-circular translation. This eccentric rotation causes displacement not only horizontally but also vertically, resulting in the unpleasant "nodding" or "wobbling" sensation of the car seat back. The latter, the concentric adjuster, surpasses the former in almost all key performance indicators. The rotation axes (centers) of the two adjusting units are strictly aligned on the same straight line, and the seat back rotates around this physically aligned axis. This provides smoothness and a better feel during adjustment, especially in manual adjustment.

[0003] Existing automotive seat adjusters typically function as a single device, meaning they cannot, if not impossible, combine backlash elimination and locking functions in a relatively simple structure. This is because the backlash elimination and locking actions are synchronized, and the structural connection is not a superposition of two mechanisms. A typical example is the patent application CN121425059A, "Concentric Adjuster for Automotive Seats and Automotive Seat Thereof." While this patent application objectively fulfills the three advantages described in paragraph 0020 of the specification, it has the following shortcomings: First, because it uses a pair of wedges and a spring positioned between the opposing ends of the wedges for backlash elimination, it can only eliminate the backlash on one side between the cam and the bushing. The locking force is also provided by only a single set of wedges, which is a local elastic backlash compensation method and cannot truly achieve the desired locking effect. Second, because it relies on cam rotation compression... The spring pushes the wedge block to unlock, but there is no independent unlocking component. Therefore, the unlocking force can only rely on the change of spring force. The fatal flaw of the spring is that it is prone to fatigue, which will lead to functional decline or even loss over time. Third, since a pair of wedge blocks can only be set in the wedge block mating cavity on one side of the drive shaft (i.e., camshaft or eccentric shaft), and the spring force opens the pair of wedge blocks, the backlash elimination is only on one side, and the backlash elimination effect is relatively poor. Fourth, due to the lack of a guiding mating structure, the relative movement between the drive shaft (i.e., camshaft or eccentric shaft) and the wedge block lacks circumferential guidance and is prone to eccentric offset. Summary of the Invention

[0004] The objective of this invention is to provide a car seat concentric adjuster with a backlash-eliminating function that helps to meet the requirements of circumferential rigid locking and circumferential backlash elimination, thereby compensating for the deficiency of single-sided backlash elimination in a structure consisting of a pair of wedge blocks and a spring; integrates backlash elimination and locking functions into one unit, thereby simplifying the structure and ensuring a long service life; improves the rotational smoothness of the drive shaft, thereby eliminating eccentric offset during adjustment; facilitates guiding the drive shaft and seat back gear plate, thereby achieving ideal transmission accuracy and preventing uneven wear.

[0005] The present invention achieves its objective by providing a car seat concentric adjuster with a backlash-free locking function, comprising a backrest gear plate, a drive shaft, a gear, a seat gear plate, and a gear plate control disc. The gear is located between the opposing sides of the backrest gear plate and the seat gear plate and meshes with both. The middle portion of the drive shaft engages with the gear. The left end of the drive shaft extends to the left side of the backrest gear plate through a drive shaft hole located in the center of the backrest gear plate, while the right end is rotatably supported within a drive shaft hole located in the center of the seat gear plate. The seat gear plate is fixed to the seat of the car seat in use, and the right side of the gear plate control disc is fixed to the left side of the seat gear plate. The invention is characterized by further including an unlocking disc located between the opposing sides of the gear plate control disc and the backrest gear plate. A drive shaft transmission hole is provided in the center of the disc. The left end of the drive shaft is engaged with the drive shaft transmission hole, and the drive shaft drives the unlocking disc to rotate. On the wall of the drive shaft transmission hole and around the circumference of the drive shaft transmission hole, there are drive shaft transmission hole guide boss cavities that communicate with the drive shaft transmission hole. The left side of the chair back tooth plate is engaged with the drive shaft transmission hole guide boss cavity at the position corresponding to the drive shaft transmission hole guide boss cavity. A chair back tooth plate backlash elimination locking cavity is formed in the middle area of ​​the left side of the chair seat tooth plate. Roller-type rigid backlash elimination locking mechanisms are provided at intervals on the outer wall of the chair back tooth plate in the circumferential direction. The roller-type rigid backlash elimination locking mechanisms lock with the back back tooth plate backlash elimination locking cavity wall and eliminate gaps or unlock.

[0006] In a specific embodiment of the present invention, a backrest gear plate gear cavity is formed in the middle region on the right side of the backrest gear plate and at the position corresponding to the gear. A left gear meshing gear ring is formed on the cavity wall of the backrest gear plate gear cavity and around the cavity wall. A seat gear plate gear cavity is formed on the left side of the seat gear plate and at the same position corresponding to the gear. A right gear meshing gear ring is formed on the cavity wall of the seat gear plate gear cavity and around the cavity wall. The gear meshes with both the left gear meshing gear ring and the right gear meshing gear ring.

[0007] In another specific embodiment of the present invention, the gear is a double gear composed of a left gear and a right gear, wherein the diameter of the right gear is larger than that of the left gear, and a gear center hole is formed in the center of the gear, and a lubricating sleeve is provided in the gear center hole. The left gear meshes with the gear ring of the left gear in the gear cavity of the chair back gear plate, and the right gear meshes with the gear ring of the right gear in the gear cavity of the chair seat gear plate. An eccentric cam is formed in the middle of the drive shaft, and the eccentric cam cooperates with the lubricating sleeve cavity of the lubricating sleeve.

[0008] In another specific embodiment of the present invention, on the left side of the backrest toothed plate and at a position corresponding to the drive shaft transmission hole guide boss cavity, there are guide bosses protruding from the left side of the backrest toothed plate in a number equal to the number of drive shaft transmission hole guide boss cavities. The guide bosses extend through the drive shaft transmission hole guide boss cavities to the left side of the unlocking disc and are fixedly connected to the backrest connector of the car seat in use. A central through hole is formed in the center of the toothed plate control disc, and the guide bosses extend to the left side of the toothed plate control disc at a position corresponding to the central through hole. There are three drive shaft transmission hole guide boss cavities that are evenly spaced around the circumference of the drive shaft transmission hole, and there are also three guide bosses.

[0009] In another specific embodiment of the present invention, a control plate cavity is formed on the right side of the toothed plate control plate and around the central through hole of the toothed plate control plate, and the unlocking plate and the seat toothed plate are located in the control plate cavity; a control plate fixing flange extends from the periphery of the control plate cavity, and the right side of the control plate fixing flange is welded and fixed to the left side of the seat toothed plate.

[0010] In another specific embodiment of the present invention, the left end of the drive shaft is configured as a drive shaft transmission sleeve mating end, on which a drive shaft transmission sleeve is fitted. The drive shaft transmission sleeve mates with the drive shaft transmission hole. When the drive shaft rotates, the drive shaft transmission sleeve mating end drives the unlocking disc to rotate through the drive shaft transmission sleeve at a position corresponding to the drive shaft transmission hole. The drive shaft transmission sleeve and the drive shaft transmission sleeve mating end are in frictional fit, and the drive shaft transmission sleeve is also in frictional fit with the wall of the drive shaft transmission hole. A drive shaft hole is formed at the axial center position of the drive shaft, extending from the left end to the right end of the drive shaft, and the drive shaft hole is a spline shaft hole.

[0011] In a further specific embodiment of the present invention, on the outer wall of the backrest tooth plate in the circumferential direction, and at positions corresponding to the roller-type rigid backlash elimination locking mechanism, there are gap-eliminating locking mechanism mating cavities in a number equal to the number of roller-type rigid backlash elimination locking mechanisms, and the roller-type rigid backlash elimination locking mechanism is disposed in the gap-eliminating locking mechanism mating cavity; at the edge of the unlocking disc and at a position corresponding to the gap-eliminating locking mechanism mating cavity, there is an unlocking foot that folds to the right, and the unlocking foot presses against or releases the roller-type rigid backlash elimination locking mechanism.

[0012] In a further specific embodiment of the present invention, a gap-eliminating washer is disposed on the left side of the unlocking disc. An unlocking foot clearance notch, equal in number to the number of unlocking feet, is formed on the edge of the gap-eliminating washer at a position corresponding to the unlocking foot. The unlocking foot corresponds to and engages with the unlocking foot clearance notch. A gap-eliminating washer boss and mating cavity are formed on the circumferential edge of the unlocking disc at positions corresponding to both sides of the unlocking foot. A gap-eliminating washer boss is formed on the gap-eliminating washer at positions on both sides of the unlocking foot clearance notch. The positions of the gap-eliminating washer bosses correspond to and engage with the gap-eliminating washer boss mating cavities. The left side of the gap-eliminating washer is in contact with the cavity wall of the control disc cavity of the toothed plate control disc, while the right side of the gap-eliminating washer is in contact with the left side of the unlocking disc.

[0013] In yet another specific embodiment of the present invention, a first elastic block embedding cavity is formed at one end of the backlash-eliminating locking mechanism's mating cavity, and a second elastic block embedding cavity is formed at the other end; the roller-type rigid backlash-eliminating locking mechanism includes a first backlash-eliminating locking roller, a second backlash-eliminating locking roller, a first elastic block, and a second elastic block. The first elastic block is embedded in the first elastic block embedding cavity and protrudes from the cavity opening of the first elastic block embedding cavity, and the second elastic block is embedded in the second elastic block embedding cavity and protrudes from the cavity opening of the second elastic block embedding cavity. The openings of the first and second elastic block embedding cavities face each other, and the first backlash-eliminating locking roller is positioned opposite the first elastic block towards the second elastic block. The first elastic block is positioned with one side in contact with the second elastic block and is located between the opposing sides of the gap-eliminating locking mechanism cavity and the backrest toothed plate gap-eliminating locking cavity wall. Similarly, the second elastic block is positioned with its side in contact with the first elastic block and is located between the opposing sides of the gap-eliminating locking mechanism cavity and the backrest toothed plate gap-eliminating locking cavity wall. When the drive shaft rotates clockwise or counterclockwise, the inner side of the unlocking foot presses against the first or second gap-eliminating locking roller. When the drive shaft is not rotating, the unlocking disc does not rotate, and the unlocking foot is positioned between the first and second gap-eliminating locking rollers.

[0014] In yet another specific embodiment of the present invention, the first elastic block and the second elastic block are rubber elastic blocks, polyurethane elastic blocks or engineering plastic elastic blocks; the rubber elastic blocks are natural rubber, nitrile rubber or silicone rubber, the polyurethane elastic blocks are TPU or CPU, and the engineering plastic elastic blocks are thermoplastic polyester elastomer (TPC-ET) or polyether block amide (PEBA).

[0015] One of the technical advantages of the present invention is that, because roller-type rigid backlash elimination locking mechanisms are spaced apart on the outer wall of the backrest toothed plate in the circumferential direction, both circumferential rigid locking and circumferential backlash elimination requirements can be met simultaneously, overcoming the shortcomings of the prior art which uses a pair of wedge blocks and a spring to cooperate in single-sided backlash elimination; secondly, because the roller-type rigid backlash elimination locking mechanism can integrate backlash elimination and locking functions, it simplifies the structure and ensures a long service life; thirdly, because the roller-type rigid backlash elimination locking mechanism is spaced at equal intervals around the outer wall of the backrest toothed plate in the circumferential direction... Therefore, it can reflect the smooth rotation of the drive shaft and eliminate the situation of eccentricity during adjustment; fourth, since the drive shaft transmission hole guide boss cavity, which communicates with the drive shaft transmission hole, extends at equal intervals on the hole wall of the drive shaft transmission hole around the added unlocking disc and in the circumferential direction of the drive shaft transmission hole, and the left side of the chair back tooth plate is matched with the drive shaft transmission hole guide boss cavity at the position corresponding to the drive shaft transmission hole guide boss cavity, it is convenient to guide the drive shaft and the chair back tooth plate, reflect ideal transmission accuracy and avoid uneven wear. Attached Figure Description

[0016] Figure 1 This is an assembly structure diagram of an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram showing the right side view of the chair back tooth plate; Figure 3 for Figure 1 A schematic diagram showing the completed assembly.

[0017] In the diagram: 1. Chair back gear plate, 11. Chair back gear plate drive shaft hole, 12. Roller-type rigid backlash elimination locking mechanism, 121. First backlash elimination locking roller, 122. Second backlash elimination locking roller, 123. First elastic block, 124. Second elastic block, 13. Chair back gear plate gear cavity, 131. Left gear mating gear ring, 14. Backlash elimination locking mechanism mating cavity, 141. First elastic block embedding cavity, 142. Second elastic block embedding cavity, 15. Guide boss; 2. Drive shaft, 21. Eccentric cam, 22. Drive shaft transmission sleeve mating end, 221. Drive shaft transmission sleeve, 2211. Drive shaft transmission sleeve tensioning notch, 23. Drive shaft hole; 3. Gear, 31. Left gear, 32. Right gear, 33. Gear center hole, 331. Lubricating sleeve, 3311. Lubricating sleeve cavity; 4. 41. Seat gear plate drive shaft hole; 42. Backrest gear plate backlash-eliminating locking cavity; 421. Backrest gear plate backlash-eliminating locking cavity wall; 43. Seat gear plate gear cavity; 431. Right gear mating gear ring; 44. Seat gear plate fixing hole; 5. Gear plate control plate; 51. Gear plate control plate central through hole; 52. Control plate cavity; 53. Control plate fixing flange edge; 6. Unlocking plate; 61. Drive shaft transmission hole; 62. Drive shaft transmission hole guide boss cavity; 63. Unlocking foot; 64. Backlash-eliminating washer boss mating cavity; 7. Backlash-eliminating washer; 71. Unlocking foot clearance notch; 72. Backlash-eliminating washer boss. Detailed Implementation

[0018] To better understand the technical essence and beneficial effects of the present invention, detailed descriptions will be provided below using embodiments. However, the descriptions of the embodiments are not intended to limit the scope of the present invention. Any formal but not substantive equivalent transformations made based on the concept of the present invention should be considered within the scope of the present invention.

[0019] In the following description, all directional or positional concepts involving up, down, left, right, front, and back, unless otherwise specified, refer to the current direction. Figure 1 The position and state are based on the location and state, and therefore should not be construed as a special limitation on the technical solution provided by the present invention.

[0020] Please see Figure 1The diagram shows a backrest gear plate 1, a drive shaft 2 (also called an "eccentric shaft"), a gear 3, a seat gear plate 4, and a gear plate control disc 5. The gear 3 is located between the backrest gear plate 1 and the seat gear plate 4 on opposite sides and meshes with both the backrest gear plate 1 and the seat gear plate 4. The middle part of the drive shaft 2 engages with the gear 3. The left end of the drive shaft 2 passes through the backrest gear plate drive shaft hole 11 located in the center of the backrest gear plate 1 and extends to the left side of the backrest gear plate 1. The right end is rotatably supported in the seat gear plate drive shaft hole 41 located in the center of the seat gear plate 4. In use, the seat gear plate 4 is fixed to the seat of the car seat through the seat gear plate fixing hole 44. The right side of the gear plate control disc 5 is fixed to the left side of the seat gear plate 4.

[0021] The key technical points of the present invention include: an unlocking disc 6 located between the aforementioned toothed plate control disc 5 and the backrest toothed plate 1 on opposite sides; a drive shaft transmission hole 61 is formed in the center of the unlocking disc 6; the left end of the aforementioned drive shaft 2 engages with the drive shaft transmission hole 61; and the drive shaft 2 drives the unlocking disc 6 to rotate; and drive shaft transmission hole guides communicating with the drive shaft transmission hole 61 extend at equal intervals on the hole wall of the drive shaft transmission hole 61 and around the circumference of the drive shaft transmission hole 61. Towards the boss cavity 62, the left side of the aforementioned backrest toothed plate 1, at the position corresponding to the aforementioned drive shaft transmission hole guide boss cavity 62, cooperates with the drive shaft transmission hole guide boss cavity 62. In the middle region of the left side of the aforementioned seat toothed plate 4, a backrest toothed plate gap elimination locking cavity 42 is formed. Roller-type rigid gap elimination locking mechanisms 12 are provided at intervals on the outer wall of the backrest toothed plate 1 in the circumferential direction. The roller-type rigid gap elimination locking mechanism 12 locks with the backrest toothed plate gap elimination locking cavity wall 421 of the backrest toothed plate gap elimination locking cavity 42 and eliminates gaps or releases the lock.

[0022] Please see Figure 2 And combined Figure 1 A backrest gear plate cavity 13 is formed in the middle region on the right side of the aforementioned backrest gear plate 1, corresponding to the position of the aforementioned gear 3. A left gear meshing gear ring 131 is formed on the cavity wall of the backrest gear plate cavity 13 and around the cavity wall. A seat gear plate cavity 43 is formed on the left side of the aforementioned seat gear plate 4, also corresponding to the position of the gear 3. A right gear meshing gear ring 431 is formed on the cavity wall of the seat gear plate cavity 43 and around the cavity wall. The aforementioned gear 3 meshes with both the left gear meshing gear ring 131 and the right gear meshing gear ring 431.

[0023] See the key points Figure 1 And combined Figure 2The aforementioned gear 3 is a double gear composed of a left gear 31 and a right gear 32. The diameter of the right gear 32 is larger than that of the left gear 31, and a gear center hole 33 is formed in the center of the gear 3. A lubricating sleeve 331 (also called a "self-lubricating sleeve") is disposed in the gear center hole 33. The aforementioned left gear 31 meshes with the aforementioned left gear meshing gear ring 131 in the aforementioned backrest gear plate gear cavity 13, and the aforementioned right gear 32 meshes with the aforementioned right gear meshing gear ring 431 in the aforementioned seat gear plate gear cavity 43. An eccentric cam 21 is formed in the middle of the aforementioned drive shaft 2, and the eccentric cam 21 cooperates with the lubricating sleeve cavity 3311 of the lubricating sleeve 331. The lubricating sleeve 331, also called a self-lubricating sleeve, is fitted onto the eccentric cam 21 through its lubricating sleeve cavity 3311.

[0024] On the left side of the aforementioned backrest toothed plate 1, and at the position corresponding to the aforementioned drive shaft transmission hole guide boss cavity 62, there are guide bosses 15 protruding from the left side of the backrest toothed plate 1 in a number equal to the number of drive shaft transmission hole guide boss cavities 62. The guide bosses 15 extend through the aforementioned drive shaft transmission hole guide boss cavity 62 to the left side of the aforementioned unlocking disc 6 and are fixedly connected to the backrest connector of the car seat in use. A toothed plate control disc central through hole 51 is formed in the center of the aforementioned toothed plate control disc 5, and the aforementioned guide bosses 15 extend to the left side of the toothed plate control disc 5 at the position corresponding to the position of the toothed plate control disc central through hole 51. There are three drive shaft transmission hole guide boss cavities 62 that are evenly spaced around the aforementioned drive shaft transmission hole 61 in the circumferential direction, and there are also three guide bosses 15.

[0025] In this embodiment, the aforementioned drive shaft transmission hole guide boss cavities 62 are three in number, evenly spaced. Correspondingly, there are also three guide bosses 15. The length of the guide bosses 15 is shorter than the length of the drive shaft transmission hole guide boss cavities 62, meaning that the guide bosses 15 maintain rotational space within the drive shaft transmission hole guide boss cavities 62. As shown in the figure, the three guide bosses 15 and the three drive shaft transmission hole guide boss cavities 62 are each arc-shaped.

[0026] If the number of the aforementioned drive shaft transmission hole guide boss cavity 62 and guide boss 15 is reasonably increased or decreased, for example, reduced to two or increased to four, then they are considered equivalent and still fall within the scope of the technical content disclosed in this invention.

[0027] See you later Figure 1A control plate cavity 52 is formed on the right side of the aforementioned toothed plate control plate 5 and around the central through hole 51 of the aforementioned toothed plate control plate. The aforementioned unlocking plate 6 and the seat toothed plate 4 are located in the control plate cavity 52. ​​A control plate fixing flange edge 53 extends from the periphery of the control plate cavity 52. ​​The right side of the control plate fixing flange edge 53 is welded and fixed to the left side of the aforementioned seat toothed plate 4.

[0028] The left end of the aforementioned drive shaft 2 is configured as a drive shaft transmission sleeve mating end 22. A drive shaft transmission sleeve 221 is fitted onto the drive shaft transmission sleeve mating end 22. The drive shaft transmission sleeve 221 mates with the aforementioned drive shaft transmission hole 61. When the drive shaft 2 rotates, the drive shaft transmission sleeve mating end 22 drives the aforementioned unlocking disc 6 to rotate through the aforementioned drive shaft transmission sleeve 221 at the position corresponding to the drive shaft transmission hole 61. The aforementioned drive shaft transmission sleeve 221 is in frictional fit with the aforementioned drive shaft transmission sleeve mating end 22, and is also in frictional fit with the hole wall of the aforementioned drive shaft transmission hole 61. In order to achieve excellent friction between the outer wall of the aforementioned drive shaft transmission sleeve 221 and the cavity wall of the drive shaft transmission hole guide boss cavity 62, and between the inner wall of the drive shaft transmission sleeve 221 and the outer wall of the drive shaft transmission sleeve mating end 22, the present invention provides a drive shaft transmission sleeve tensioning notch 2211 on the drive shaft transmission sleeve 221; and provides a drive shaft hole 23 extending from the left end to the right end of the aforementioned drive shaft 2 at the axial center position, and the drive shaft hole 23 is a spline shaft hole.

[0029] On the outer wall of the aforementioned backrest tooth plate 1 in the circumferential direction, and at positions corresponding to the aforementioned roller-type rigid backlash elimination locking mechanism 12, there are gap elimination locking mechanism mating cavities 14, the number of which is equal to the number of roller-type rigid backlash elimination locking mechanisms 12. The aforementioned roller-type rigid backlash elimination locking mechanism 12 is disposed in the gap elimination locking mechanism mating cavity 14. At the edge of the aforementioned unlocking disc 6, and at a position (i.e., "area") corresponding to the aforementioned gap elimination locking mechanism mating cavity 14, there is an unlocking foot 63 that folds to the right. The unlocking foot 63 presses against or releases the aforementioned roller-type rigid backlash elimination locking mechanism 12.

[0030] A gap-eliminating washer 7 is provided on the left side of the aforementioned unlocking disc 6. On the edge of the gap-eliminating washer 7, and at the position corresponding to the aforementioned unlocking foot 63, there are unlocking foot clearance notches 71 in the same number as the unlocking foot 63. The unlocking foot 63 corresponds to and cooperates with the unlocking foot clearance notches 71. On the circumferential edge of the unlocking disc 6, and at the positions on both sides corresponding to the unlocking foot 63, there are gap-eliminating washer bosses and cavities 64. On the gap-eliminating washer 7, and at the positions on both sides of the aforementioned unlocking foot clearance notches 71, there are gap-eliminating washer bosses 72. The positions of the gap-eliminating washer bosses 72 correspond to and cooperate with the gap-eliminating washer boss cavities 64. The left side of the aforementioned gap-eliminating washer 7 is in contact with the cavity wall of the control disc cavity 52 of the aforementioned toothed plate control disc 5, and the right side of the gap-eliminating washer 7 is in contact with the left side of the unlocking disc 6.

[0031] A first elastic block recess 141 is formed at one end of the aforementioned backlash-eliminating locking mechanism mating cavity 14, and a second elastic block recess 142 is formed at the other end. The aforementioned roller-type rigid backlash-eliminating locking mechanism 12 includes a first backlash-eliminating locking roller 121, a second backlash-eliminating locking roller 122, a first elastic block 123, and a second elastic block 124. The first elastic block 123 is embedded in the aforementioned first elastic block recess 141 and protrudes from the opening of the first elastic block recess 141. The second elastic block 124 is embedded in the aforementioned second elastic block recess 142 and protrudes from the opening of the second elastic block recess 142. The openings of the first and second elastic block recesses 141 and 142 face each other. The first backlash-eliminating locking roller 121 faces the first elastic block 123 towards the second elastic block 124. The first elastic block 124 is positioned in contact with the first elastic block 123 and is located between the mating cavity 14 of the aforementioned backlash-eliminating locking mechanism and the opposing side of the backlash-eliminating locking cavity wall 421 of the aforementioned backrest tooth plate. Similarly, the second backlash-eliminating locking roller 122 is positioned in contact with the side of the second elastic block 124 facing the first elastic block 123 and is also located between the mating cavity 14 of the aforementioned backlash-eliminating locking mechanism and the opposing side of the backrest tooth plate backlash-eliminating locking cavity wall 421. When the aforementioned drive shaft 2 is rotating clockwise or counterclockwise, the inner side of the aforementioned unlocking foot 63 presses against the aforementioned first backlash-eliminating locking roller 121 or the aforementioned second backlash-eliminating locking roller 122. When the drive shaft 2 is not rotating, the aforementioned unlocking disc 6 does not rotate, and the aforementioned unlocking foot 63 is positioned between the first and second backlash-eliminating locking rollers 121 and 122. The "non-rotating state" refers to a state where the backrest angle is not adjusted.

[0032] In this embodiment, the aforementioned first elastic block 123 and second elastic block 124 are rubber-based elastic blocks. Natural rubber is preferred, but nitrile rubber or silicone rubber can also be used. It is entirely feasible to use polyurethane or engineering plastic elastic blocks as the first and second elastic blocks 123 and 124. When using polyurethane elastic blocks, TPU or CPU can be selected, while when using engineering plastic elastic blocks, thermoplastic polyester elastomer (TPC-ET) or polyether block amide (PEBA) can be selected.

[0033] Please see Figure 3 , Figure 3 for Figure 1 This diagram shows the state of the car seat after assembly, meaning it is ready for use.

[0034] Applicant combined Figures 1 to 3 The operation process of the present invention is described as follows: When the drive shaft 2 is driven clockwise by the shaft (spline shaft) of the motor drive mechanism (not shown in the figure) that matches the hole shape of the drive shaft hole 23, since the linkage boss 64 is engaged with the linkage boss mating cavity 22, the drive shaft transmission sleeve mating end 22 of the drive shaft 2 drives the unlocking disk 6 through the drive shaft transmission sleeve 221 at the position corresponding to the drive shaft transmission hole 61. The unlocking feet 63 (three) on the unlocking disk 6 press the aforementioned first backlash-eliminating locking rollers 121 (three) on the side rotating clockwise. At this time, the first backlash-eliminating locking rollers 121 are displaced by pressing the first elastic block 123, thus disengaging from the abutment with the aforementioned backlash-eliminating locking cavity wall 421 of the chair back tooth plate, thereby completing the unlocking. During the aforementioned process, as the backrest toothed plate 1 rotates clockwise, the three second backlash-eliminating locking rollers 122 press against the three second elastic blocks 124, causing displacement and disengagement from their contact with the backrest toothed plate backlash-eliminating locking cavity wall 421, thus simultaneously unlocking. Simultaneously, the eccentric cam 21 of the drive shaft 2 causes the gear 3 to move in planetary motion. Specifically, the left gear 31 meshes with the left gear engagement ring 131, causing the backrest toothed plate 1 to rotate. When the drive shaft 2 stops rotating, that is, when the aforementioned motor drive mechanism stops working, the first backlash-eliminating locking roller 121 and the second backlash-eliminating locking roller 122 are simultaneously pushed out (pushed out) under the elastic restoring force of the first elastic block 123 and the second elastic block 124, respectively, thereby eliminating backlash and simultaneously locking between the cavity wall of the backlash-eliminating locking mechanism engagement cavity 14 and the opposing side of the backrest toothed plate backlash-eliminating locking cavity wall 421. The process by which the second backlash-eliminating locking roller 122 on the counterclockwise rotating side is pressed by the unlocking foot 63 due to the counterclockwise rotation of the drive shaft 2 is the opposite of the aforementioned clockwise rotation, but the principle is the same, so the applicant will not elaborate further.

[0035] During the clockwise or counterclockwise rotation of the aforementioned backrest toothed plate 1, in addition to the unlocking disc 6 being driven by the drive shaft transmission sleeve 221, the guide boss 15 on the left side of the backrest toothed plate 1 cooperates with the guide boss cavity 62 of the drive shaft transmission hole, thus providing a good guiding effect for the backrest toothed plate 1. Furthermore, since a backlash-eliminating washer 7 is added, the gap between the cavity wall of the control disc cavity 52 of the toothed plate control disc 5 and the unlocking disc 6 is eliminated by the backlash-eliminating washer 7, allowing the unlocking disc 6 to play a more ideal role. For example, it allows the unlocking foot 63 to exert an ideal contact and compression effect on the first backlash-eliminating locking roller 121 and the second backlash-eliminating locking roller 122, and it also improves the smoothness of the rotation of the unlocking disc 6, because the backlash-eliminating washer 7 rotates accordingly with the unlocking disc 6 during the aforementioned clockwise / counterclockwise rotation of the unlocking disc 6.

[0036] Based on common knowledge, for a single car seat, the present invention provides one car seat concentric adjuster with backlash-eliminating locking function, one on each of the left and right sides of the car seat, meaning one pair of the present invention is provided for each car seat, but only one set of the aforementioned motor drive mechanism is needed. If it is a manual adjustment, then only one manual adjustment handle is needed. Furthermore, based on professional knowledge, in a pair of the present invention's car seat concentric adjusters with backlash-eliminating locking function, the drive shaft hole 23 of the aforementioned drive shaft 2 of the car seat concentric adjuster system accompanying the electric or manual drive mechanism extends from the left end to the right end of the drive shaft 2, while the drive shaft hole 23 of the drive shaft 2 of the other car seat concentric adjuster with backlash-eliminating locking function can be a blind hole, that is, it can be a hole that does not extend through the entire axial length of the drive shaft 2.

[0037] In summary, the technical solution provided by this invention makes up for the shortcomings of the prior art, successfully completes the invention task, and accurately realizes the technical effects described by the applicant in the above technical effects column.

Claims

1. A car seat concentric angle adjuster with backlash-eliminating locking function, comprising a backrest toothed plate (1), a drive shaft (2), a gear (3), a seat toothed plate (4), and a toothed plate control disc (5), wherein the gear (3) is located between the backrest toothed plate (1) and the seat toothed plate (4) on opposite sides and meshes with both the backrest toothed plate (1) and the seat toothed plate (4), the middle part of the drive shaft (2) engages with the gear (3), the left end of the drive shaft (2) extends to the left side of the backrest toothed plate (1) through a backrest toothed plate drive shaft hole (11) opened in the center of the backrest toothed plate (1), and the right end is rotatably supported in a seat toothed plate drive shaft hole (41) opened in the center of the seat toothed plate (4), the seat toothed plate (4) is fixed to the seat of the car seat in use, and the right side of the toothed plate control disc (5) is fixed to the left side of the seat toothed plate (4), characterized in that: It also includes an unlocking disc (6) located between the toothed plate control disc (5) and the backrest toothed plate (1) on opposite sides. A drive shaft transmission hole (61) is provided in the center of the unlocking disc (6). The left end of the drive shaft (2) is engaged with the drive shaft transmission hole (61), and the unlocking disc (6) is rotated by the drive shaft (2). On the hole wall of the drive shaft transmission hole (61) and around the circumference of the drive shaft transmission hole (61), there are drive shaft transmission hole guide boss cavities (62) that communicate with the drive shaft transmission hole (61). The left side of the backrest toothed plate (1) is engaged with the drive shaft drive hole guide boss cavity (62) at the position corresponding to the drive shaft drive hole guide boss cavity (62). A backrest toothed plate gap elimination locking cavity (42) is formed in the middle area of ​​the left side of the seat toothed plate (4). Roller-type rigid gap elimination locking mechanisms (12) are provided at intervals on the outer wall of the backrest toothed plate (1) in the circumferential direction. The roller-type rigid gap elimination locking mechanism (12) locks with the backrest toothed plate gap elimination locking cavity wall (421) of the backrest toothed plate gap elimination locking cavity (42) and eliminates gaps or releases the lock.

2. The car seat concentric angle adjuster with gap-eliminating locking function according to claim 1, characterized in that: A backrest gear plate cavity (13) is formed in the middle region on the right side of the backrest gear plate (1) and at the position corresponding to the gear (3). A left gear meshing gear ring (131) is formed on the cavity wall of the backrest gear plate cavity (13) and around the cavity wall. A seat gear plate cavity (43) is formed on the left side of the seat gear plate (4) and at the position corresponding to the gear (3). A right gear meshing gear ring (431) is formed on the cavity wall of the seat gear plate cavity (43) and around the cavity wall. The gear (3) meshes with both the left gear meshing gear ring (131) and the right gear meshing gear ring (431).

3. The car seat concentric angle adjuster with gap-eliminating locking function according to claim 2, characterized in that: The gear (3) is a double gear composed of a left gear (31) and a right gear (32). The diameter of the right gear (32) is larger than that of the left gear (31). A gear center hole (33) is opened in the center of the gear (3). A lubrication sleeve (331) is provided in the gear center hole (33). The left gear (31) meshes with the left gear meshing ring (131) in the gear cavity (13) of the chair back gear plate. The right gear (32) meshes with the right gear meshing ring (431) in the gear cavity (43) of the chair seat gear plate. An eccentric cam (21) is formed in the middle of the drive shaft (2). The eccentric cam (21) meshes with the lubrication sleeve cavity (3311) of the lubrication sleeve (331).

4. The car seat concentric angle adjuster with gap-eliminating locking function according to claim 1, characterized in that: On the left side of the backrest toothed plate (1) and at the position corresponding to the drive shaft transmission hole guide boss cavity (62), there are guide bosses (15) protruding from the left side of the backrest toothed plate (1) in an equal number to the number of drive shaft transmission hole guide boss cavities (62). The guide bosses (15) extend through the drive shaft transmission hole guide boss cavity (62) to the left side of the unlocking disc (6) and are fixedly connected to the backrest connector of the car seat in use. A toothed plate control disc central through hole (51) is formed in the center of the toothed plate control disc (5). The guide bosses (15) extend to the left side of the toothed plate control disc (5) at the position corresponding to the central through hole (51). There are three drive shaft transmission hole guide boss cavities (62) that are evenly spaced around the circumference of the drive shaft transmission hole (61). There are also three guide bosses (15).

5. The car seat concentric angle adjuster with gap-eliminating locking function according to claim 4, characterized in that: A control plate cavity (52) is formed on the right side of the toothed plate control plate (5) and around the central through hole (51) of the toothed plate control plate. The unlocking plate (6) and the seat toothed plate (4) are located in the control plate cavity (52). A control plate fixing flange (53) extends from the edge of the control plate cavity (52). The right side of the control plate fixing flange (53) is welded and fixed to the left side of the seat toothed plate (4).

6. The car seat concentric angle adjuster with gap-eliminating locking function according to claim 1, characterized in that: The left end of the drive shaft (2) is configured as a drive shaft transmission sleeve mating end (22). A drive shaft transmission sleeve (221) is fitted on the drive shaft transmission sleeve mating end (22). The drive shaft transmission sleeve (221) is mated with the drive shaft transmission hole (61). When the drive shaft (2) rotates, the drive shaft transmission sleeve mating end (22) drives the unlocking disc (6) to rotate through the drive shaft transmission sleeve (221) at the position corresponding to the drive shaft transmission hole (61). The drive shaft transmission sleeve (221) is in friction fit with the drive shaft transmission sleeve mating end (22) and is also in friction fit with the hole wall of the drive shaft transmission hole (61). A drive shaft hole (23) is opened at the axial center position of the drive shaft (2), extending from the left end of the drive shaft (2) to the right end. The drive shaft hole (23) is a spline shaft hole.

7. The car seat concentric angle adjuster with gap-eliminating locking function according to claim 1, characterized in that: On the outer wall of the backrest tooth plate (1) in the circumferential direction, and at a position corresponding to the roller rigid backlash elimination locking mechanism (12), there are gap elimination locking mechanism mating cavities (14) with an equal number of roller rigid backlash elimination locking mechanisms (12). The roller rigid backlash elimination locking mechanism (12) is disposed in the gap elimination locking mechanism mating cavity (14). At the edge of the unlocking disc (6) and at a position corresponding to the gap elimination locking mechanism mating cavity (14), there is an unlocking foot (63) that folds to the right. The unlocking foot (63) presses against or releases the roller rigid backlash elimination locking mechanism (12).

8. The car seat concentric angle adjuster with gap-eliminating locking function according to claim 7, characterized in that: A gap-eliminating washer (7) is provided on the left side of the unlocking disc (6). On the edge of the gap-eliminating washer (7), at positions corresponding to the unlocking feet (63), there are unlocking foot clearance notches (71) equal in number to the number of unlocking feet (63). The unlocking feet (63) correspond to and cooperate with the unlocking foot clearance notches (71). On the circumferential edge of the unlocking disc (6), at positions corresponding to both sides of the unlocking feet (63), gap-eliminating washer bosses are formed. The cavity (64) is fitted with a gap-eliminating washer (7), and a gap-eliminating washer boss (72) is formed on each side of the gap-eliminating washer (71) located on the unlocking foot clearance notch (71). The position of the gap-eliminating washer boss (72) corresponds to and fits with the gap-eliminating washer boss mating cavity (64). The left side of the gap-eliminating washer (7) is in contact with the cavity wall of the control plate cavity (52) of the toothed plate control plate (5), and the right side of the gap-eliminating washer (7) is in contact with the left side of the unlocking plate (6).

9. The car seat concentric angle adjuster with gap-eliminating locking function according to claim 7, characterized in that: A first elastic block recess (141) is formed at one end of the backlash-eliminating locking mechanism mating cavity (14), and a second elastic block recess (142) is formed at the other end; the roller-type rigid backlash-eliminating locking mechanism (12) includes a first backlash-eliminating locking roller (121), a second backlash-eliminating locking roller (122), a first elastic block (123), and a second elastic block (124). The first elastic block (123) is embedded in the first elastic block recess (141) and protrudes from the opening of the first elastic block recess (141), and the second elastic block (124) is embedded in the second elastic block recess (142) and protrudes from the opening of the second elastic block recess (142). The openings of the first and second elastic block recesses (141, 142) face each other. The first backlash-eliminating locking roller (121) is positioned opposite the first elastic block (123) towards the second elastic block (142). The first elastic block (124) is positioned between the mating cavity (14) of the backlash-eliminating locking mechanism and the wall (421) of the backrest toothed plate backlash-eliminating locking cavity, with one side of the first elastic block (124) in contact with the second elastic block (124) facing the first elastic block (123). The second backlash-eliminating locking roller (122) is also positioned between the mating cavity (14) of the backlash-eliminating locking mechanism and the wall (421) of the backrest toothed plate backlash-eliminating locking cavity, with the side of the second elastic block (124) in contact with the side of the first elastic block (123). When the drive shaft (2) is in a clockwise or counterclockwise rotation state, the inner side of the unlocking foot (63) presses against the first backlash-eliminating locking roller (121) or the second backlash-eliminating locking roller (122). When the drive shaft (2) is in a non-rotating state, the unlocking disc (6) does not rotate, and the unlocking foot (63) is positioned between the first and second backlash-eliminating locking rollers (121, 122).

10. The car seat concentric angle adjuster with gap-eliminating locking function according to claim 9, characterized in that: The first elastic block (123) and the second elastic block (124) are rubber elastic blocks, polyurethane elastic blocks or engineering plastic elastic blocks; the rubber elastic blocks are natural rubber, nitrile rubber or silicone rubber, the polyurethane elastic blocks are TPU or CPU, and the engineering plastic elastic blocks are thermoplastic polyester elastomers or polyether block amides.

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