High-strength ball leg support sliding rail mechanism and working method thereof

Abstract

The application relates to a high-strength ball leg support sliding rail mechanism and a working method thereof, and belongs to the technical field of sliding rails.The high-strength ball leg support sliding rail mechanism comprises an inner rail, an upper support, a ball holder, balls, an outer rail, a lower reinforcing support, a composite function locking nail and an internal reinforcing nail, the inner rail is connected with the upper support, the outer rail is connected with the lower reinforcing support, the ball holder is provided with a plurality of balls, the inner rail and the outer rail slide through the plurality of balls, the inner rail and the upper support are provided with the composite function locking nail, the lower reinforcing support and the outer rail are fixed through the at least one internal reinforcing nail, the lower reinforcing support is respectively provided with a turn-up edge one and a turn-up edge two which are similar in structure, the upper ends of the turn-up edge one and the turn-up edge two are provided with function bending arcs, and the two function bending arcs are oppositely arranged through bending and the arcs on the two function bending arcs are oppositely arranged. The application further provides a working method of the high-strength ball leg support sliding rail mechanism. The application has the advantages of reasonable structure design, stability and reliability, improved mechanical strength, increased service life, convenient assembly and disassembly and meeting the use requirement.

Description

Technical Field

[0001] This invention relates to a slide rail mechanism and its working method, and more particularly to a high-strength ball bearing leg support slide rail mechanism and its working method, which belongs to the field of slide rail technology. Background Technology

[0002] With the booming development of the automotive industry, consumers are placing increasingly higher demands on the comfort, safety, and functionality of automobiles. Sliding rails primarily enable functions such as seat fore-and-aft adjustment and flexible movement of the vehicle platform. They are crucial components for improving the utilization of interior space and ease of use in automobiles. As a key support structure for components such as car seats and vehicle platforms, their performance directly impacts the user's driving and riding experience.

[0003] With the popularization and development of zero-gravity seats, leg rest structures have emerged and are showing a trend of complex and multi-functional integration. Leg rests integrate functions such as massage and heating, which increases the requirements of the leg rest slide rail for extreme weight load and improves the rigidity requirements after being loaded. The automotive interior industry requires slide rails to be small in size, high in rigidity, strong in load-bearing capacity, and have strong mechanical locking and certain noise reduction requirements at the end of the travel.

[0004] Although the leg supports are numerous, motor-driven, and have end locking functions integrated into other functional structures, such as lead screws, the compactness of the space design and the increased load on them can lead to an increase in the stall torque generated by the motor at the end. Under some working conditions, these adverse loads can also act on the slide rail body. Especially in situations involving safety accidents, such as high-speed vehicle collisions, the slide rail end itself has stable and reliable locking strength, which can also prevent the separation and ejection of the connecting functional mechanisms, further avoiding personal injury.

[0005] Existing slide rail structure: (1) The front and rear ends of the internal ball retainer interact with the sheet metal structure on the inner and outer rails to become the main position function stop point of the front and rear positions of the slide rail; or the sheet metal structure of the inner and outer rails contacts the steel balls at the front and rear ends of the ball retainer; (2) There will be the last bending of the installation process on the large sheet metal parts such as the inner and outer rails to complete the assembly of the entire slide rail assembly; (3) Lack of end buffer and noise reduction mechanism.

[0006] The principle analysis of the main defects is as follows: (1) The ball cage body is made of thin material stamping, and the overall mechanical strength is weak. If it is used as a key force-bearing component of the stop point, it cannot bear the adverse loads such as abuse force generated by the working conditions, which poses a safety hazard. Most existing products use it as the end limit position limit or even mechanical locking point. At this time, this part becomes a key force-bearing component. (2) Since this bending must be done after the part is electroplated, the electroplating layer here will be permanently damaged, and the overall corrosion resistance of the product will be weakened. (3) Under the working conditions that require running the full stroke of the slide rail, the end impact will be generated inside the slide rail. Without a noise reduction mechanism, this impact cannot be avoided, which will reduce the service life of the product and generate a certain amount of noise, reducing the comfort of the public.

[0007] Chinese patent CN217515031U, published on September 30, 2022, discloses a patent entitled "A Slide Rail Mechanism." This patent includes a clamp, an upper rail, a retainer, and a lower rail. The lower rail is a U-shaped structure formed by a first plate and a first guard edge, pointing upwards. The first guard edge has an outwardly expanding arc-shaped groove. The retainer is composed of a sliding member and a second guard edge. The middle part of the sliding member protrudes upwards to form a cavity, and the lower surface of the sliding member is located on the upper surface of the first plate. The second guard edge has a notch containing a sliding ball, the outer side of which is located in the arc-shaped groove. The upper rail is located on the retainer and is composed of a second plate and a lower convex edge. The lower convex edge has an inwardly expanding notch, and another part of the sliding ball is located in the notch. The clamp is U-shaped and is engaged with and slidably connected to the outer side of the first guard edge of the lower rail. Although the patented technology uses ball bearings for smooth and stable operation, its overall mechanical strength is relatively weak as the load increases, making it unable to meet the requirements of existing multi-functional loads. Therefore, it still suffers from the aforementioned defects.

[0008] Therefore, it is particularly necessary to provide a slide rail structure that is safe, reasonable, stable, reliable, strong, and has a long service life. Summary of the Invention

[0009] The purpose of this invention is to overcome the above-mentioned deficiencies in the prior art and to provide a high-strength ball bearing leg support slide rail mechanism and its working method that has a safe and reasonable structural design, is stable and reliable, improves mechanical strength, increases service life, and is easy to assemble and disassemble.

[0010] The technical solution adopted by the present invention to solve the above problems is as follows: the high-strength ball bearing leg support slide rail mechanism includes an inner rail, an upper bracket, a ball retainer, balls, an outer rail, and a lower reinforcing bracket. The inner rail is connected to the upper bracket, and the outer rail is connected to the lower reinforcing bracket. The ball retainer is provided with multiple balls, and also includes a composite functional locking pin and at least one internal reinforcing pin. The inner rail and the outer rail are slidably fitted by multiple balls. The inner rail and the upper bracket are provided with composite functional locking pins. The lower reinforcing bracket is fixed to the outer rail by at least one internal reinforcing pin. The two ends of the lower reinforcing bracket are respectively provided with a flange one and a flange two with similar structures. The upper ends of flange one and flange two are provided with functional bending arcs. The two functional bending arcs are bent and the arcs on them are arranged opposite to each other.

[0011] Preferably, the present invention also includes an O-ring, wherein the O-ring is embedded in the upper circular groove of the composite functional locking pin.

[0012] Preferably, the ball retainer of the present invention has a relief groove for displacement of the composite function locking pin. The relief groove is rectangular and its end extends toward the center of the ball retainer.

[0013] Preferably, the outer rail of the present invention is provided with a first convex bulge, a second convex bulge, a third convex bulge, and a fourth convex bulge. The first convex bulge and the second convex bulge are respectively provided with a first convex bulge plane and a second convex bulge plane. The lower reinforcing bracket is provided with a first square groove and a second square groove. The first square groove and the second square groove are respectively provided with a first square groove plane and a second square groove plane. The first convex bulge plane and the second convex bulge plane correspond to the first square groove plane and the second square groove plane, respectively. This makes the outer rail and the lower reinforcing bracket fit tightly together and strengthens the degree of bonding between the two.

[0014] Preferably, the functional bending arc of the present invention includes a first flange arc and a second flange arc, with an O-ring in contact with the first flange arc and the second flange arc; it has two similar flanges (first flange and second flange) at its two ends, with a flange angle of 90° relative to the bottom surface, and the upper end of the flange has an arc feature; the first flange arc and the second flange arc are arranged in a facing shape; the O-ring is in close contact with the arc surface of the lower reinforcing bracket, transferring the load borne by the inner rail above to the lower reinforcing bracket.

[0015] Preferably, the internal reinforcing nail of the present invention is provided with a rivet conical surface, and the outer rail is provided with a hole conical surface, the rivet conical surface and the hole conical surface are matched, so that the two are firmly fixed in the vertical direction.

[0016] Preferably, the internal reinforcing nail of the present invention includes a main internal reinforcing nail and an auxiliary internal reinforcing nail, wherein the main internal reinforcing nail is higher than the auxiliary internal reinforcing nail; after being loaded in the Z direction, it provides double strength protection.

[0017] Preferably, the functional gap 2 between the internal reinforcing nail and the first and second flanges in the sliding direction is 0-0.5mm.

[0018] Preferably, the inner rail and the outer rail of the present invention slide through ball bearings, which are limited by a ball retainer, and the functional gap between the upper support and the lower reinforcing support is 0.2-1mm.

[0019] The present invention also provides a working method for a high-strength ball bearing leg support slide rail mechanism, the specific steps of which are as follows: (S1) Assemble the inner rail and upper bracket, embed O-rings in the composite function locking pins, and fix the composite function locking pins and internal reinforcing pins accordingly to obtain the inner rail sub-assembly. (S2) Assemble the lower mounting bolts on the lower reinforcing bracket to obtain the lower reinforcing bracket assembly; (S3) First, form the third protrusion on the outer rail, then install multiple balls into the ball cage, then form the fourth protrusion, and then install the inner rail sub-assembly to complete the assembly of the inner rail and outer rail bodies. (S4) After the lower reinforcement bracket assembly is fitted and positioned with the bottom of the outer rail, first insert the auxiliary internal reinforcement pin, then pull the slide rail to the closed state, then insert the main internal reinforcement pin, and then test the motion force. (S5) Secure the main internal reinforcing nail and the auxiliary internal reinforcing nail to the lower reinforcing bracket to complete the final assembly.

[0020] Compared with the prior art, the present invention has the following advantages and effects: (1) The overall structure design is reasonable and safe and reliable. Through comparative testing, the new design has significantly improved the locking force at the end of the vehicle body direction compared with the current products on the market. The stiffness performance in the vertical load direction has also been significantly improved. Compared with the same severe load, the products on the market have failed and made obvious noises, while the leg support slide rail structure of this application remains intact. (2) Due to the positive change in the process, the destructive end assembly bending was abandoned, so the degree of permanent damage to the electroplating layer is also reduced, and the overall corrosion resistance of the product is also improved. (3) Due to the access of the flexible O-ring when the end is collided, the noise performance is improved, and the noise quality and degree are improved. (4) When the composite functional locking nail and the flange one and flange two in the lower reinforcing bracket are impacted, the main impact force acts on the functional bending arc surface, and after the bending undergoes elastic deformation, it contacts the internal reinforcing nail to achieve double protection. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present invention.

[0022] Figure 2 This is a top view of the structure of an embodiment of the present invention.

[0023] Figure 3This is a side view structural diagram of an embodiment of the present invention.

[0024] Figure 4 This is a three-dimensional structural schematic diagram of an embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the structure of the sliding rail at the front and rear limit positions in an embodiment of the present invention.

[0026] Figure 6 yes Figure 5 A magnified view of a section at point B.

[0027] Figure 7 This is a cross-sectional structural schematic diagram of the blocking point at the front and rear limit positions of the slide rail in an embodiment of the present invention.

[0028] Figure 8 This is a schematic diagram of the interconnection between the ball retainer, outer rail, and lower reinforcing bracket in an embodiment of the present invention.

[0029] Figure 9 This is a schematic diagram of the structure of the ball cage and the ball in an embodiment of the present invention.

[0030] Figure 10 This is a three-dimensional structural diagram of the outer rail in an embodiment of the present invention.

[0031] Figure 11 This is a top view of the outer rail structure in an embodiment of the present invention.

[0032] Figure 12 This is a three-dimensional structural diagram of the lower reinforcing bracket in an embodiment of the present invention.

[0033] Figure 13 yes Figure 12 A partial structural diagram.

[0034] Figure 14 yes Figure 13 A cross-sectional view of the CC structure.

[0035] Figure 15 This is a schematic diagram of functional gap one in an embodiment of the present invention.

[0036] In the diagram: Inner rail 1, Upper bracket 2, Ball retainer 3, Ball 4, Outer rail 5, Lower reinforcing bracket 6, Upper mounting bolt 7, Lower mounting bolt 8, Composite function locking pin 9, O-ring 10, Internal reinforcing pin 11, Z1 is the position of the front stop at the opening limit position; Ball retainer 3: clearance groove 31; Outer rail 5: Convex hull 1 501, Convex hull 2 ​​502, Convex hull 3 502, Convex hull 4 504, Convex hull 1 plane S1, Convex hull 2 ​​plane S2, Hole conical surface C-1; Lower reinforcement bracket 6: flange one 601, flange two 602, square channel one 603, square channel two 604, plane of square channel one S-1, plane of square channel two S-2, arc of flange one SS1, arc of flange two SS2. Internal reinforcing nail 11: main internal reinforcing nail 111, auxiliary internal reinforcing nail 112, rivet conical surface C1, functional clearance one G1, functional clearance two G2. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments. Example

[0038] See Figures 1 to 15 The high-strength ball bearing leg support slide rail mechanism of this embodiment includes an inner rail 1, an upper bracket 2, a ball retainer 3, balls 4, an outer rail 5, a lower reinforcing bracket 6, a composite functional locking pin 9, and at least one internal reinforcing pin 11. The inner rail 1 is connected to the upper bracket 2, and the outer rail 5 is connected to the lower reinforcing bracket 6. Multiple balls 4 are provided on the ball retainer 3.

[0039] In this embodiment, the inner rail 1 and the outer rail 5 are slidably fitted by multiple balls 4. The inner rail 1 and the upper bracket 2 are provided with composite functional locking pins 9. The lower reinforcing bracket 6 is fixed to the outer rail 5 by at least one internal reinforcing pin 11. The two ends of the lower reinforcing bracket 6 are respectively provided with a flange 1 601 and a flange 2 602 with similar structures. The upper ends of flange 1 601 and flange 2 602 are both provided with functional bending arcs. The two functional bending arcs are arranged in a relatively opposite layout by bending.

[0040] In this embodiment, the ball retainer 3 is provided with a relief groove 31 for the displacement of the composite function locking pin 9. The relief groove 31 is rectangular and the end of the relief groove 31 extends toward the center of the ball retainer 3.

[0041] In this embodiment, the outer rail 5 is provided with a first convex 501, a second convex 502, a third convex 503, and a fourth convex 504. The first convex 501 and the second convex 502 are respectively provided with a first convex plane S1 and a second convex plane S2. The lower reinforcing bracket 6 is provided with a first square groove 603 and a second square groove 604. The first square groove 603 and the second square groove 604 are respectively provided with a first square groove plane S-1 and a second square groove plane S-2. The first convex plane S1 and the second convex plane S2 correspond to the first square groove plane S-1 and the second square groove plane S-2, respectively.

[0042] In this embodiment, the upper ends of flange 1 601 and flange 2 602 are respectively provided with flange 1 arc SS1 and flange 2 arc SS2, that is, the functional arcs include flange 1 arc SS1 and flange 2 arc SS2; the O-ring 10 is in contact with flange 1 arc SS1 and flange 2 arc SS2.

[0043] In this embodiment, the upper bracket 2 is provided with an upper mounting bolt 7 (the upper mounting bolt 7 can be replaced with a through hole or a pressure cap nut, depending on the actual situation), and the lower reinforcing bracket 6 is provided with a lower mounting bolt 8. The upper bracket 2 adopts a rectangular cross-section shape, and the lower reinforcing bracket 6 is provided with a lower mounting bolt 8.

[0044] In this embodiment, the internal reinforcing nail 11 includes a main internal reinforcing nail 111 and an auxiliary internal reinforcing nail 112, wherein the main internal reinforcing nail 111 is higher than the auxiliary internal reinforcing nail 112.

[0045] In this embodiment, the inner rail 1 and the upper bracket 2 are fixed by riveting or welding. The upper bracket 2 has a rectangular cross-section (other shapes can also be used). The outer rail 5 and the lower reinforcing bracket 6 are connected by rivets. The inner rail 1 and the outer rail 5 slide between each other through the ball bearing 4. The ball bearing 4 is limited by the ball retainer 3. The functional gap G1 between the upper bracket 2 and the lower reinforcing bracket 6 is 0.2-1mm. In this embodiment, the functional gap G1 is 0.5mm.

[0046] When the slide rail reaches its end position, the composite locking pin 9 has an O-ring 10 embedded in its circular groove. The O-ring 10 makes tight contact with the arc surfaces (arc SS1 of flange one and arc SS2 of flange two) of the lower reinforcing bracket 6, transferring the load borne by the inner rail 1 to the lower reinforcing bracket 6. Because the O-ring 10 is made of rubber, it has a shock-absorbing effect, and the collision noise generated at this moment is significantly reduced and improved. Figures 5-7 as well as Figures 12-14 The lower reinforcing bracket 6 needs to be tightly integrated with the outer rail 5 to further transfer the end load to the outer rail body and enhance the overall load capacity of the outer rail. At this time, the outer rail 5 and the lower reinforcing bracket 6 are mainly fixed by the internal reinforcing nail 11. The internal reinforcing nail 11 has a rivet conical surface C1 that fits with the conical surface C-1 of the same hole on the outer rail 5, so that the two are firmly fixed in the vertical direction.

[0047] In this embodiment, the internal reinforcing nail 11 and the flange 601 (flange 602) are close to each other in the sliding direction and may even make contact. The functional gap G2 is defined as 0-0.5mm. In this embodiment, the functional gap G2 is 0.14mm.

[0048] To further enhance the connection between the outer rail 5 and the lower reinforcing bracket 6, two rectangular protrusions, 501 and 502, are formed on the outer rail 5. These protrusions form two functional planes along their length (plane S1 of protrusion one and plane S2 of protrusion two), corresponding to plane S-1 of the square groove 603 and plane S-2 of the square groove 604 formed by stamping the flange 601 of the reinforcing bracket 6. At the S1 and S2 functional planes, the outer rail 5 and the lower reinforcing bracket 6 are tightly fitted together. (See [reference needed]). Figures 13-15 as well as Figures 7-14 .

[0049] like Figure 6 As shown, Z1 is the position of the front stop at the limit position (lower reinforcing bracket 6, composite function locking pin 9 and internal reinforcing pin 11).

[0050] In this embodiment, the lower reinforcing bracket 6 is a long strip of sheet metal with two similar flanges (flange one 601 and flange two 602) at its upper two ends. The flange angle is 90° relative to the bottom surface, and the upper end of the flange has a functional arc (flange one arc SS1 and flange two arc SS2). The two functional arcs are arranged in a facing shape.

[0051] The working process of the high-strength ball bearing leg support slide rail mechanism in this embodiment is as follows: (S1) The inner rail 1 and the upper bracket 2 are assembled. The composite function locking pin 9 is embedded with an O-ring 10. The composite function locking pin 9 and the internal reinforcing pin 11 are fixed accordingly to obtain the inner rail sub-assembly. (S2) Assemble the lower mounting bolts 8 on the lower reinforcing bracket 6 to obtain the lower reinforcing bracket 6 assembly; (S3) First, form the convex hull 3 503 on the outer rail 5, then install multiple balls 4 into the ball cage 3, then form the convex hull 4 504, and then install the inner rail sub-assembly to complete the assembly of the inner rail 1 and the outer rail 5 body. (S4) Position the lower reinforcing bracket 6 component against the bottom of the outer rail 5, insert the auxiliary internal reinforcing nail 112 first, then pull the slide rail to the closed state, insert the main internal reinforcing nail 111, and then test the motion force. (S5) Fix the main internal reinforcing nail 111 and the auxiliary internal reinforcing nail 112 to the lower reinforcing bracket 6 to complete the final assembly.

[0052] This embodiment uses the interaction of position blocking points between two reinforcing brackets (upper bracket 2 and lower reinforcing bracket 6) located on the inner rail 1 and outer rail 5, so that the limit position is completely unrelated to the traditional ball cage, thereby greatly enhancing the impact resistance and abusive load capacity of the slide rail at the limit position; and due to the intervention of the composite function locking pin 9, internal reinforcing pin 11 and motion limit function parts, the slide rail has stronger Z-direction stiffness and a certain shock absorption and noise reduction function.

[0053] The following experiments further demonstrate the beneficial effects of this invention: The products currently on the market were placed in the testing machine for testing. The test results were as follows: (1) When the load reached 580N, the products on the market deformed and the jamming function failed. After manual reset, the abnormal noise intensified. In contrast, the new design was still intact and without abnormal noise when the load reached 1200N. In summary, the locking force at the end of the vehicle body direction of this application is increased by more than 1 times. (2) In the preliminary comparison test of the comprehensive stiffness performance in the Z direction, the products on the market became more abnormal and jammed after being subjected to a severe load of 350N applied above 200mm of travel for 1 minute. The sliding function was partially failed. However, the leg support slide rail of this application remained intact and without abnormal noise under the same force conditions.

[0054] This embodiment creates connections between high-strength components, forming high-strength stress-bearing nodes, thereby generating new functional inventions in terms of product mechanics and safety. Furthermore, based primarily on the application background of the automotive interior industry, it designs lightweight and miniaturized structures for each component of the product, thus creating a highly integrated functional composite product.

[0055] Based on the above description, those skilled in the art are already able to implement it.

[0056] Furthermore, it should be noted that the specific embodiments described in this specification may have different shapes and names of parts and components. The above description in this specification is merely an illustrative example of the structure of the present invention.

Claims

1. A high-strength ball bearing support slide rail mechanism, comprising an inner rail (1), an upper bracket (2), a ball retainer (3), balls (4), an outer rail (5), and a lower reinforcing bracket (6), wherein the inner rail (1) is connected to the upper bracket (2), the outer rail (5) is connected to the lower reinforcing bracket (6), and a plurality of balls (4) are provided on the ball retainer (3), characterized in that: It also includes a composite functional locking pin (9), an O-ring (10), and at least one internal reinforcing pin (11). The inner rail (1) and the outer rail (5) are connected by multiple balls (4) to form a sliding fit. The inner rail (1) and the upper bracket (2) are provided with composite functional locking pins (9). The lower reinforcing bracket (6) is fixed to the outer rail (5) by at least one internal reinforcing pin (11). The two ends of the lower reinforcing bracket (6) are respectively provided with a flange one (601) and a flange two (602) with similar structures. The upper ends of flange one (601) and flange two (602) are provided with functional bending arcs. The two functional bending arcs are arranged in a layout with the arcs on them facing each other after bending. The upper circular groove of the composite functional locking pin (9) is inlaid with an O-ring (10). The internal reinforcing pin (11) includes a main internal reinforcing pin (111) and an auxiliary internal reinforcing pin (112). The reinforcing pin (111) is higher than the auxiliary internal reinforcing pin (112); the outer rail (5) is provided with convex bulge one (501), convex bulge two (502), convex bulge three (503) and convex bulge four (504), convex bulge one (501) and convex bulge two (502) are respectively provided with convex bulge one plane (S1) and convex bulge two plane (S2), the lower reinforcing bracket (6) is provided with square groove one (603) and square groove two (604), square groove one (603) The square groove 2 (604) is provided with a square groove 1 plane (S-1) and a square groove 2 plane (S-2), and the convex hull 1 plane (S1) and the convex hull 2 ​​plane (S2) correspond to the square groove 1 plane (S-1) and the square groove 2 plane (S-2) respectively; the functional bending arc includes a flange 1 arc (SS1) and a flange 2 arc (SS2), and the O-ring (10) is in contact with the flange 1 arc (SS1) and the flange 2 arc (SS2).

2. The high-strength ball bearing leg support slide rail mechanism according to claim 1, characterized in that: The ball retainer (3) is provided with a relief groove (31) for the displacement of the composite function locking pin (9). The relief groove (31) is rectangular and the end of the relief groove (31) extends toward the center of the ball retainer (3).

3. The high-strength ball bearing leg support slide rail mechanism according to claim 1, characterized in that: The internal reinforcing nail (11) is provided with a rivet conical surface (C1), and the outer rail (5) is provided with a hole conical surface (C-1). The rivet conical surface (C1) matches the hole conical surface (C-1).

4. The high-strength ball bearing leg support slide rail mechanism according to claim 1, characterized in that: The functional gap (G2) between the internal reinforcing nail (11) and the first flange (601) and the second flange (602) in the sliding direction is 0-0.5mm.

5. The high-strength ball bearing leg support slide rail mechanism according to claim 1, characterized in that: The inner rail (1) and the outer rail (5) slide through the ball (4), which is limited by the ball retainer (3). The functional gap (G1) between the upper bracket (2) and the lower reinforcing bracket (6) is 0.2-1mm.

6. A method for operating a high-strength ball bearing leg support slide rail mechanism, comprising the high-strength ball bearing leg support slide rail mechanism as described in any one of claims 1 to 5, characterized in that: The specific steps are as follows: (S1) The inner rail (1) and the upper bracket (2) are assembled. The composite function locking pin (9) is embedded with an O-ring (10). The composite function locking pin (9) and the internal reinforcing pin (11) are fixed accordingly to obtain the inner rail sub-assembly. (S2) The lower reinforcing bracket (6) is assembled with the lower mounting bolt (8) to obtain the lower reinforcing bracket (6) assembly; (S3) First, form the convex 3 (503) on the outer rail (5), then install multiple balls (4) on the ball retainer (3), then form the convex 4 (504), and then install the inner rail sub-assembly to complete the assembly of the inner rail (1) and outer rail (5) body. (S4) The lower reinforcing bracket (6) assembly is fitted and positioned with the bottom of the outer rail (5). First, insert the auxiliary internal reinforcing nail (112), then pull the slide rail to the closed state, and then insert the main internal reinforcing nail (111), and then test the motion force. (S5) Fix the main internal reinforcing nail (111) and the auxiliary internal reinforcing nail (112) to the lower reinforcing bracket (6) to complete the final assembly.

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