Slide rail assembly for reducing noise of automobile seat

Abstract

The invention provides a sliding rail assembly for improving noise of an automobile seat, and belongs to the technical field of automobile accessories, two sliding assemblies are oppositely arranged, each sliding assembly comprises an upper sliding rail and a lower sliding rail, and the upper sliding rails are arranged in the lower sliding rails in a sliding mode; the sound absorption part is arranged in at least one of the upper sliding rail and the lower sliding rail. According to the sliding rail assembly, the first sound absorption part and the second sound absorption part are installed in the upper sliding rail and the lower sliding rail, meanwhile, the sound absorption holes, the sound insulation grooves and the sound guide grooves are formed in the design of the sound absorption parts and the sliding rail motor support, when sound waves are spread in gaps, air between meridians and collaterals can move back and forth, the air rubs against the static meridians and collaterals, and therefore the sound waves can be effectively absorbed. Therefore, sound energy is consumed, the effects of absorbing the sound energy and improving noise are achieved, and the driving experience is effectively improved.

Description

Technical Field

[0001] The invention mainly relates to the technical field of automobile accessories, and in particular to a slide rail assembly for improving the noise of automobile seats. Background Art

[0002] With the rapid development of the automobile industry in recent years, the demand for passenger car seats has become increasingly greater, and the requirements for passenger car seat slides, which are one of the main functional parts of passenger car seats, have also become increasingly higher.

[0003] The vehicle seats should be designed to make the driver or passengers very comfortable. The driver's seat and the front passenger seat can be moved forward and backward. The driver, in particular, can adjust the seat position according to his or her body shape to ensure that he or she can sit in the seat in the most comfortable posture and conveniently operate the dashboard or control pedals. When adjusting the seat position and adjusting the body while driving, there is a loud noise between the upper and lower slide rails, which affects the driving experience. Summary of the invention

[0004] The present invention mainly provides a slide rail assembly for improving the noise of automobile seats to solve the technical problems raised in the above-mentioned background technology.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A slide rail assembly for improving the noise of a car seat, comprising:

[0007] Two sliding assemblies arranged opposite to each other, the sliding assemblies comprising an upper sliding rail and a lower sliding rail, the upper sliding rail being slidably arranged in the lower sliding rail;

[0008] The sound absorbing member is arranged inside at least one of the upper slide rail and the lower slide rail.

[0009] Optionally, in the present invention, the sound absorbing member includes a first sound absorbing member and a second sound absorbing member, the first sound absorbing member is arranged on the inner top wall of the upper slide rail, and the second sound absorbing member is arranged on the inner bottom of the lower slide rail;

[0010] The first sound absorbing member and the second sound absorbing member both include a first accommodating cavity, and the first accommodating cavity is provided with second sound absorbing holes distributed in an array.

[0011] Optionally, in the present invention, along the length direction of the sound absorbing member, a sound absorbing portion is provided between each row of adjacent second sound absorbing holes; along the width direction of the sound absorbing member, a gap is provided between each column of adjacent sound absorbing portions;

[0012] The sound absorbing portion extends outward from the bottom of the first accommodating cavity, and the extension height of the sound absorbing portion does not exceed the first accommodating cavity. In a plane parallel to the sound absorbing member, the cross-section of the sound absorbing portion is triangular, and the apex angles of adjacent sound absorbing portions in each row are opposite.

[0013] Optionally, in the present invention, there is a gap between the second sound absorbing member and the lower sliding rail, and a sound discharge hole is provided on the lower sliding rail in the bottom area of ​​the second sound absorbing member.

[0014] Optionally, in the present invention, it further includes a slide rail motor bracket and a driving mechanism disposed in the slide rail motor bracket;

[0015] The two ends of the slide rail motor bracket are respectively connected to the two upper slide rails;

[0016] The driving mechanism includes a bidirectional motor installed on a slide rail motor bracket, two conduction shafts installed at both ends of the bidirectional motor, four screw rod brackets installed on both sides of the two lower slide rails, two screw rods installed between the two screw rod brackets in the same lower slide rail, and two gear box assemblies slidably connected to the two screw rods, and the two gear box assemblies are respectively connected to the conduction shafts on the corresponding sides.

[0017] Optionally, in the present invention, the widths of the two ends of the middle section of the slide rail motor bracket are different, a motor slot is provided at the wider end of the slide rail motor bracket, and axial slots are provided on the slide rail motor brackets on both sides of the motor slot;

[0018] A plurality of first sound-absorbing holes are arranged in the motor slot;

[0019] At least one row of sound insulation components is arranged on the main body of the slide rail motor bracket surrounding the motor slot and the axial slot, and the sound insulation component includes a plurality of sound insulation slots.

[0020] Optionally, in the present invention, sound guide grooves are provided between at least one row of the sound insulation grooves, and the plurality of sound guide grooves connect the plurality of sound insulation grooves to each other;

[0021] The sound insulation groove is in the shape of an isosceles trapezoid.

[0022] Optionally, in the present invention, the bottom of the screw support at one end of the lower slide rail is a full-circular structure.

[0023] Optionally, in the present invention, a pre-filling hole is provided on the lower slide rail in the bottom area of ​​the screw rod bracket at the other end of the lower slide rail, and the pre-filling hole is a double-strip hole structure.

[0024] Optionally, in the present invention, the cross section of the lower slide rail is a "concave" structure with an opening at the top, the cross section of the upper slide rail is a "convex" structure with an opening at the bottom, and both ends of the upper slide rail are inserted into the lower slide rail upward;

[0025] A retaining frame is installed on both inner walls of the lower slide rail, both ends of the retaining frame are inclined inward, and a plurality of steel balls are installed at equal distances on the top and bottom ends of the retaining frame, and the steel balls are in contact with the outer side of the bottom of the upper slide rail.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The slide rail assembly of the present invention installs a first sound absorbing member and a second sound absorbing member in the upper slide rail and the lower slide rail, and a plurality of sound absorbing holes are provided in the design of the sound absorbing member and the slide rail motor bracket. When the slide rail generates sound during operation, the sound waves will propagate inside the sound absorbing member and absorb the sound through the sound absorbing holes. At the same time, the triangular wedge mechanism of the sound absorbing part can increase the meridians on the sound absorbing member, so that the sound waves can continuously move between the sound absorbing members. When the sound waves propagate in the gap, they will cause the air between the meridians to move back and forth, and rub against the stationary meridians, thereby consuming sound energy, absorbing sound energy, and improving noise, thereby preventing the driver from making excessive noise when adjusting the seat, and effectively improving the driving experience.

[0028] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the structure of the slide rail motor support area of ​​the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of the slide rail motor bracket of the present invention;

[0032] Figure 4 It is an exploded view of the overall structure of the present invention;

[0033] Figure 5 for Figure 4 A magnified image of area A;

[0034] Figure 6 is a schematic structural diagram of a first sound absorbing member of the present invention;

[0035] Figure 7 It is a schematic diagram of the upper slide rail and the lower slide rail area structure from a first perspective of the present invention;

[0036] Figure 8 A schematic diagram of the screw rod support structure at one end of the present invention;

[0037] Fig. 9 A schematic diagram of the upper slide rail and the lower slide rail region structure of the present invention from a second viewing angle;

[0038] Fig.10 It is a schematic diagram of the structure of the pre-filling hole area of ​​the present invention;

[0039] Fig.11 It is a side view of the upper slide rail and the lower slide rail area of ​​the present invention.

[0040] In the figure:

[0041] 10. Lower slide rail; 11. Sound discharge hole; 12. Pre-charging hole;

[0042] 20. Upper slide rail;

[0043] 30. Slide rail motor bracket; 31. Motor slot; 32. Axial slot; 33. First sound absorbing hole; 34. Sound insulation slot; 35. Sound guide slot;

[0044] 40. Driving mechanism; 41. Bidirectional motor; 42. Transmission shaft; 43. Gear box assembly; 44. Screw; 45. Screw bracket; 46. L-shaped connecting block;

[0045] 50. first sound absorbing member; 51. second sound absorbing hole; 52. sound absorbing portion; 53. first accommodating cavity;

[0046] 60. a second sound absorbing member;

[0047] 70. Cage; 71. Steel ball. DETAILED DESCRIPTION

[0048] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0049] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0051] For examples, please refer to the attached Figure 1-11 , a slide rail assembly for improving the noise of a car seat, comprising:

[0052] Two sliding components are arranged opposite to each other, and the sliding components include an upper sliding rail 20 and a lower sliding rail 10 . The upper sliding rail 20 is slidably arranged in the lower sliding rail 10 .

[0053] The sound absorbing member is disposed inside at least one of the upper slide rail 20 and the lower slide rail 10 .

[0054] For details, please refer to the attached Figure 4 The sound absorbing member includes a first sound absorbing member 50 and a second sound absorbing member 60, wherein the first sound absorbing member 50 is disposed on the inner top wall of the upper slide rail 20, and the second sound absorbing member 60 is disposed on the inner bottom of the lower slide rail 10;

[0055] The first sound absorbing member 50 and the second sound absorbing member 60 both include a first accommodating cavity 54 , and the first accommodating cavity 54 is provided with second sound absorbing holes 51 distributed in an array.

[0056] It should be noted that, in this embodiment, the first sound absorbing member 50 and the second sound absorbing member 60 are respectively disposed inside the upper rail 20 and the lower rail 10 , and the noise can be effectively absorbed through the second sound absorbing holes 51 distributed in an array thereon.

[0057] For details, please refer to the attached Figure 6 and attached Figure 8 Along the length direction of the sound absorbing member, a sound absorbing portion 52 is provided between each row of adjacent second sound absorbing holes 51 ; along the width direction of the sound absorbing member, a gap is provided between each column of adjacent sound absorbing portions 52 .

[0058] The sound absorbing portion 52 extends outward from the bottom of the first accommodating cavity 54 , and the extending height of the sound absorbing portion 52 does not exceed the first accommodating cavity 54 .

[0059] In this embodiment, a gap is provided between each row of adjacent sound absorbing parts 52 , so as to ensure that sound waves collide back and forth between the sound absorbing parts 52 , thereby achieving sound attenuation.

[0060] Exemplarily, the height of the sound absorbing part 52 does not exceed the first accommodating cavity 54 , and then the sound absorbing part 52 is disposed in the first accommodating cavity 54 , which is beneficial to protecting the sound absorbing part 52 from friction by external force, thereby ensuring the integrity of the sound absorbing part 52 .

[0061] For example, the height of the sound absorbing portion 52 is equal to the height of the first accommodating cavity 54, and the sound absorbing portion 52 can be more in contact with the sound waves, thereby consuming sound energy and absorbing sound energy. In addition, the sound absorbing portion 52 can also play a role in supporting the body of the sound absorbing member, further enhancing the stability of the sound absorbing member.

[0062] In a plane parallel to the sound absorbing member, the cross-section of the sound absorbing portion 52 is triangular, and the apex angles of adjacent sound absorbing portions 52 in each row are opposite.

[0063] There is a gap between the second sound absorbing member 60 and the lower sliding rail 10 , and a sound discharge hole 11 is provided on the lower sliding rail 10 at the bottom area of ​​the second sound absorbing member 60 .

[0064] In this embodiment, in a plane parallel to the sound absorbing member, the cross-section of the sound absorbing portion 52 is triangular.

[0065] It should be noted that, in a plane parallel to the sound absorbing member, the cross-sectional shape of the sound absorbing portion 52 may also be square, circular, or other special shapes, or a combination of two or more shapes.

[0066] It should be noted that, in this embodiment, the design of the sound exhaust hole 11 enables the bottom of the lower sliding rail 10 to be connected to the atmosphere. When sound waves propagate in the gap, they will cause the air between the meridians to move back and forth. At the same time, the sound absorbing part 52 can be more in contact with the sound waves, and rub against the second sound absorbing holes 51 and the sound absorbing part 52 meridians on the stationary second sound absorbing member 60, thereby consuming sound energy, absorbing sound energy, and improving noise.

[0067] It should also be noted that the slide rail assembly of the present invention installs the first sound absorbing member and the second sound absorbing member 60 in the upper slide rail 20 and the lower slide rail 10, and multiple sound absorbing holes are provided in the design of the sound absorbing member and the slide rail motor bracket 30. When the slide rail generates sound, the sound waves will propagate inside the sound absorbing member and absorb the sound through the sound absorbing holes. At the same time, the triangular wedge mechanism of the sound absorbing part 52 can increase the meridians on the sound absorbing member, so that the sound waves can continuously move between the sound absorbing members. When the sound waves propagate in the gap, they will cause the air between the meridians to move back and forth, and rub against the static meridians, thereby consuming sound energy, absorbing sound energy, and improving noise. When the driver adjusts the seat, it prevents excessive noise and effectively improves the driving experience.

[0068] Buckle buttons are installed at both ends of one side where the sound absorbing parts 52 of the first sound absorbing member 50 and the second sound absorbing member 60 are located, and buckle holes adapted to the buckle buttons are provided on the top surface of the upper slide rail 20 and the bottom surface of the lower slide rail 10.

[0069] It should be noted that, in the present embodiment, both the first sound absorbing member 50 and the second sound absorbing member 60 are made of the sound absorbing material PET, and the snap button is a plastic part. When installing the sound absorbing member, it is only necessary to align the snap button with the snap hole 21 and insert it. The snap button can be smoothly inserted into the snap hole 21, thereby completing the convenient installation of the first sound absorbing member 50 and the second sound absorbing member 60 on the slide rail.

[0070] For details, please refer to the attached Figure 1 and attached Figure 4 , also includes a slide rail motor bracket 30 and a driving mechanism 40 arranged in the slide rail motor bracket 30.

[0071] The driving mechanism 40 includes a bidirectional motor 41 installed on the slide rail motor bracket 30, two conduction shafts 42 installed at both ends of the bidirectional motor 41, four screw brackets 45 installed on both sides of the two lower slide rails 10, two screw rods 44 installed between the two screw rod brackets 45 in the same lower slide rail 10, and two gear box assemblies 43 slidably connected to the two screw rods 44. The two gear box assemblies 43 are respectively connected to the conduction shafts 42 on the corresponding sides.

[0072] It should be noted that, in this embodiment, the operation of the bidirectional motor 41 can rotate the transmission shaft 42, so that the gear box assembly 43 slides on the screw rod 44, thereby causing the upper slide rail 20 to slide on the lower slide rail 10, thereby completing the front and rear adjustment of the seat.

[0073] It should also be noted that a worm gear is provided in the gearbox assembly 43, and the driving mechanism 40 as a whole is conventional existing technology and will not be excessively introduced, and the bidirectional motor 41 is connected to the vehicle power supply.

[0074] For details, please refer to the attached Figure 2 and attached Figure 3 The widths of the two ends of the middle section of the slide rail motor bracket 30 are different. The wider end of the slide rail motor bracket 30 is provided with a motor slot 31, and the slide rail motor bracket 30 on both sides of the motor slot 31 is provided with axial slots 32;

[0075] A plurality of first sound absorbing holes 33 are provided in the motor slot 31;

[0076] At least one row of sound insulation components is disposed on the main body of the slide rail motor bracket 30 surrounding the motor slot 31 and the axial slot 32 , and the sound insulation components include a plurality of sound insulation slots 34 .

[0077] It should be noted that, in the present embodiment, the slide rail motor bracket 30 also has a sound-absorbing structure. Since the sound waves generated by the bidirectional motor 41 are relatively large, two rows of sound-isolating grooves 34 are arranged near the motor groove 31. The multiple sound-isolating grooves 34 and the multiple first sound-absorbing holes 33 can effectively consume sound energy and improve the effect of the noise generated by the slide rail motor bracket 30.

[0078] For details, please refer to the attached Figure 3 A sound guide groove 35 is provided between at least one row of the sound insulation grooves 34 , and the plurality of sound guide grooves 35 connect the plurality of sound insulation grooves 34 to each other.

[0079] The sound insulation groove 34 is in the shape of an isosceles trapezoid.

[0080] It should be noted that, in the present embodiment, the sound insulation groove 34 can effectively increase the meridian area and consume sound energy more effectively. At the same time, the sound guide groove 35 runs through the sound insulation groove 34 to facilitate the continuous propagation of sound waves inside for consumption, thereby improving the noise reduction effect.

[0081] For details, please refer to the attached Figure 8 The bottom of the screw support 45 at one end of the lower sliding rail 10 is a full circle structure.

[0082] For details, please refer to the attached Fig.10 A pre-filling hole 12 is provided on the lower slide rail 10 at the bottom area of ​​the screw support 45 at the other end of the lower slide rail 10, and the pre-filling hole 12 is a double-strip hole structure.

[0083] It should be noted that, in this embodiment, the end screw support 45 adopts a full-circle structure, which increases the contact surface with the lower slide rail 10, thereby ensuring more uniform force when riveting with the lower slide rail 10, ensuring the position of the end screw support 45, improving the concentricity of the screw 44 and the screw support 45, and ensuring consistency during the front and rear operation processes.

[0084] At the same time, the conventional pre-filling hole 12 is a single-hole structure, while the pre-filling hole 12 of the present device is a double-hole structure, thereby reducing the punching force when punching the blocking point, reducing the deformation of the lower slide rail 10, ensuring the flatness of the lower slide rail 10, and improving the consistency during the front and rear operations; at the same time, it can ensure the flatness at the blocking point, accurately ensure the position of the screw rod 44 during assembly, and improve the accuracy of assembly.

[0085] For details, please refer to the attached Figure 5 and attached Fig.11 The cross section of the lower slide rail 10 is a "concave" structure with an opening at the top, and the cross section of the upper slide rail 20 is a "convex" structure with an opening at the bottom, and both ends of the upper slide rail 20 are inserted into the lower slide rail 10 upward.

[0086] A retaining frame 70 is installed on the inner walls of both sides of the lower slide rail 10. Both ends of the retaining frame 70 are inclined inward, and a plurality of steel balls 71 are installed at equal distances on the top and bottom ends of the retaining frame 70. The steel balls 71 are in contact with the outer side of the bottom of the upper slide rail 20.

[0087] It should be noted that, in the present embodiment, the lower slide rail 10 and the upper slide rail 20 are engaged with each other, so that the upper slide rail 20 can slide stably inside the lower slide rail 10 .

[0088] When the upper slide rail 20 slides inside the lower slide rail 10, both sides of the bottom of the upper slide rail 20 are in contact with the steel balls 71, which will drive the steel balls 71 to rotate, thereby reducing friction resistance, making the upper slide rail 20 slide more smoothly and preventing noise.

[0089] A car comprises a car seat, wherein the car seat comprises the above-mentioned slide rail assembly.

[0090] For details, please refer to the attached Figure 3 , L-shaped connecting blocks 46 are installed on the top of both sides of the gear box assembly 43, and the L-shaped connecting blocks 46 are connected to the upper slide rail 20 through fixing bolts;

[0091] It should be noted that, in this embodiment, by aligning the slotted holes on the L-shaped connecting block 46 with the slotted holes on the upper slide rail 20 and then installing fixing bolts, a fixed connection between the gear box assembly 43 and the upper slide rail 20 can be achieved, thereby driving the upper slide rail 20 to slide through the gear box assembly 43.

[0092] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A slide rail assembly for improving the noise of a car seat, characterized in that: include: Two sliding assemblies arranged opposite to each other, the sliding assemblies comprising an upper sliding rail (20) and a lower sliding rail (10), the upper sliding rail (20) being slidably arranged in the lower sliding rail (10); A sound absorbing member is arranged inside at least one of the upper slide rail (20) and the lower slide rail (10).

2. The slide rail assembly for improving the noise of automobile seats according to claim 1, characterized in that: The sound absorbing member comprises a first sound absorbing member (50) and a second sound absorbing member (60), wherein the first sound absorbing member (50) is arranged on the inner top wall of the upper slide rail (20), and the second sound absorbing member (60) is arranged on the inner bottom of the lower slide rail (10); The first sound absorbing member (50) and the second sound absorbing member (60) both comprise a first accommodating cavity (53), and the first accommodating cavity (53) is provided with second sound absorbing holes (51) distributed in an array.

3. The slide rail assembly for improving the noise of automobile seats according to claim 2 is characterized in that: Along the length direction of the sound absorbing member, a sound absorbing portion (52) is provided between each row of adjacent second sound absorbing holes (51); along the width direction of the sound absorbing member, a gap is provided between each column of adjacent sound absorbing portions (52); The sound absorbing portion (52) extends outward from the bottom of the first accommodating cavity (53), and the extension height of the sound absorbing portion (52) does not exceed the first accommodating cavity (53). In a plane parallel to the sound absorbing member, the cross-section of the sound absorbing portion (52) is triangular, and the top angles of adjacent sound absorbing portions (52) in each row are opposite.

4. The slide rail assembly for improving the noise of automobile seats according to claim 2, characterized in that: There is a gap between the second sound absorbing member (60) and the lower lower rail (10), and a sound discharge hole (11) is provided on the lower lower rail (10) in the bottom area of ​​the second sound absorbing member (60).

5. The slide rail assembly for improving automobile seat noise according to claim 1, characterized in that: It also includes a slide rail motor bracket (30) and a driving mechanism (40) arranged in the slide rail motor bracket (30); The two ends of the slide rail motor bracket (30) are respectively connected to the two upper slide rails (20); The driving mechanism (40) comprises a bidirectional motor (41) mounted on a slide rail motor bracket (30), two conduction shafts (42) mounted at both ends of the bidirectional motor (41), four screw rod brackets (45) mounted on both sides of the inside of the two lower slide rails (10), two screw rods (44) mounted between the two screw rod brackets (45) in the same lower slide rail (10), and two gear box assemblies (43) slidably connected to the two screw rods (44), and the two gear box assemblies (43) are respectively connected to the conduction shafts (42) on the corresponding sides.

6. The slide rail assembly for improving the noise of automobile seats according to claim 5, characterized in that: The widths of the two ends of the middle section of the slide rail motor bracket (30) are different, a motor slot (31) is provided at the wider end of the slide rail motor bracket (30), and axial slots (32) are provided on the slide rail motor bracket (30) on both sides of the motor slot (31); A plurality of first sound-absorbing holes (33) are provided in the motor slot (31); At least one row of sound insulation components is arranged on the main body of the slide rail motor bracket (30) surrounding the motor slot (31) and the axial slot (32), and the sound insulation component includes a plurality of sound insulation slots (34).

7. The slide rail assembly for improving the noise of automobile seats according to claim 6, characterized in that: A sound guide groove (35) is provided between at least one row of the sound insulation grooves (34), and the plurality of sound guide grooves (35) mutually connect the plurality of sound insulation grooves (34); The sound insulation groove (34) is in the shape of an isosceles trapezoid.

8. The slide rail assembly for improving automobile seat noise according to claim 5, characterized in that: The bottom of the screw rod support (45) at one end of the lower sliding rail (10) is a full-circular structure.

9. The slide rail assembly for improving the noise of automobile seats according to claim 8, characterized in that: A pre-filling hole (12) is provided on the lower rail (10) at the bottom area of ​​the screw rod bracket (45) at the other end of the lower rail (10), and the pre-filling hole (12) is a double-strip hole structure.

10. The slide rail assembly for improving automobile seat noise according to claim 1, characterized in that: The cross section of the lower slide rail (10) is a "concave" structure with an opening at the top, and the cross section of the upper slide rail (20) is a "convex" structure with an opening at the bottom, and both ends of the upper slide rail (20) are inserted into the interior of the lower slide rail (10) with the ends facing upwards; A retaining frame (70) is installed on both inner walls of the lower slide rail (10), both ends of the retaining frame (70) are inclined inwards, and a plurality of steel balls (71) are installed at equal distances on the top and bottom ends of the retaining frame (70), and the steel balls (71) are in contact with the outer side of the bottom of the upper slide rail (20).

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