Suspension strut assembly with polyurethane outer bump stop

Abstract

This utility model discloses a suspension strut assembly with a polyurethane external buffer block, relating to the field of suspension strut technology. It includes a lower suspension connector with a shock absorber and spring seat fixedly mounted on its top, the shock absorber located inside the spring seat; a lower cylinder fixedly mounted on the top of the shock absorber and spring seat, the lower cylinder having several equidistant alignment through holes arranged from top to bottom; and an upper cylinder slidably mounted on the top of the lower cylinder. In this suspension strut assembly with a polyurethane external buffer block, the adjusting mechanism controls the synchronous retraction and extension of the protruding column through a single-action control of a threaded sleeve, achieving rapid unlocking and locking; the equidistantly distributed alignment through holes support precise locking at multiple height levels; a spiral fixing ring and a lower blocking ring form a bidirectional constraint to prevent axial displacement of the polyurethane buffer mechanism; and a return spring forces the protruding column back into the alignment through holes, ensuring locking stability.

Description

Technical Field

[0001] This utility model relates to the field of suspension strut technology, and in particular to a suspension strut assembly with a polyurethane outer buffer block. Background Technology

[0002] Traditional suspension struts often use rubber for their buffer blocks, which are prone to plastic deformation under long-term compression, leading to buffer failure. Height adjustment mechanisms typically rely on external hydraulic pressure or complex locking structures, resulting in high maintenance costs. While polyurethane materials offer weather resistance, their single structure is susceptible to cracking under extreme impacts and lacks axial stress relief design. Furthermore, existing height adjustment mechanisms are cumbersome to operate and struggle to achieve rapid and accurate positioning. Utility Model Content

[0003] The main purpose of this utility model is to provide a suspension strut assembly with a polyurethane external buffer block, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A suspension strut assembly with a polyurethane external buffer block includes a lower suspension connector with a shock absorber and a spring seat fixedly mounted on its top, the shock absorber being located inside the spring seat;

[0006] The lower cylinder is fixedly installed on the top of the shock absorber and spring seat, and the lower cylinder is provided with a number of alignment through holes that are equidistantly arranged from top to bottom;

[0007] The upper cylinder is slidably installed inside the top of the lower cylinder;

[0008] An adjusting mechanism, installed inside the upper cylinder, includes an upper fixed plate, a threaded sleeve, an adjusting nut, an upper spring plate, a protruding post, a lower spring plate, and a lower fixed plate. The upper and lower fixed plates are respectively fixed to the top and bottom of the upper cylinder. The threaded sleeve is threaded through the upper fixed plate. The lower spring plate is fixed to the top surface of the lower fixed plate, and the protruding post is fixed to its top. The upper spring plate is fixed to the top of the two protruding posts, and its top end corresponds to the bottom end of the threaded sleeve.

[0009] A polyurethane buffer mechanism is sleeved and installed between the lower suspension connector and the lower cylinder and located outside the spring seat; it includes, from the inside out, an inner reinforcing skeleton, an intermediate buffer layer, and an outer protective shell; the inner reinforcing skeleton is made of nylon fiberglass composite material, the intermediate buffer layer is made of microporous foamed polyurethane, and the outer protective shell is made of thermoplastic polyurethane coating; the side wall of the polyurethane buffer mechanism is provided with a segmented stress relief structure, including alternating protrusions and recesses along the axial direction.

[0010] Preferably, the central axis of the raised ring and the central axis of the recessed groove are staggered and offset, and a helical spring is embedded inside the raised ring, with both ends of the helical spring fixed to the inner reinforcing skeleton.

[0011] Preferably, a return spring is fixedly installed between the two protruding posts, and the upper cylinder is provided with two through slots. The two protruding posts slide through the corresponding through slots respectively, and the positions of the protruding posts and the alignment through holes correspond.

[0012] Preferably, the top of the lower suspension connector is fixed with a lower blocking ring at the bottom of the polyurethane buffer mechanism, and a spiral fixing ring is threaded onto the bottom of the outer surface of the lower cylinder. The polyurethane buffer mechanism is located between the spiral fixing ring and the lower blocking ring.

[0013] Preferably, a support frame is fixed to the top of the upper cylinder, and a fixing plate is fixed to the top of the support frame.

[0014] Preferably, a fixing nut is threaded through the fixing disc, one end of the fixing nut is rotatably connected to the rotating disc, an upper suspension connector is fixed to the top of the rotating disc, and a retaining tooth is provided between the fixing disc and the rotating disc.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] Significantly improved cushioning performance: The inner reinforced skeleton (nylon fiberglass composite material) of the polyurethane cushioning mechanism provides high-strength support, the middle cushioning layer (microporous foamed polyurethane) achieves efficient energy absorption, and the outer protective shell (TPU coating) enhances wear resistance and weather resistance, comprehensively improving service life; Axial stress graded release: The segmented raised ring and recessed groove structure disperses impact stress and avoids local cracking failure.

[0017] The adjustment mechanism controls the synchronous retraction and extension of the protruding column through a single action of the threaded sleeve, achieving rapid unlocking and locking; the equidistantly distributed alignment through holes support precise locking at multiple height levels.

[0018] Enhanced system reliability: The spiral fixing ring and the lower blocking ring form a bidirectional constraint to prevent axial displacement of the polyurethane buffer mechanism; the return spring forces the protruding column to reset and insert into the alignment through hole to ensure locking stability; the toothed structure between the fixed plate and the rotating plate improves the torsional resistance of the upper suspension connector during installation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the suspension strut assembly with polyurethane external buffer block according to this utility model;

[0020] Figure 2 This is a front view structural schematic diagram of the suspension strut assembly with polyurethane external buffer block according to this utility model;

[0021] Figure 3 This is a three-dimensional structural diagram of the fixed disk and rotating disk of the suspension strut assembly with polyurethane external buffer block according to this utility model.

[0022] Figure 4 This is a schematic diagram of the installation structure of the suspension strut assembly adjustment mechanism with polyurethane external buffer block according to this utility model.

[0023] Figure 5 This is a cross-sectional structural diagram of the polyurethane buffer mechanism of the suspension strut assembly with polyurethane external buffer block according to this utility model.

[0024] In the diagram: 1. Lower suspension connector; 2. Lower blocking ring; 3. Polyurethane buffer mechanism; 31. Inner reinforcing frame; 32. Intermediate buffer layer; 33. Outer protective shell; 4. Spiral fixing ring; 5. Lower cylinder; 6. Alignment through hole; 7. Upper cylinder; 8. Adjustment mechanism; 81. Upper fixing plate; 82. Threaded sleeve; 83. Adjusting nut; 84. Upper spring; 85. Protruding column; 86. Lower spring; 87. Lower fixing plate; 88. Return spring; 9. Support frame; 10. Fixed plate; 11. Rotating plate; 12. Upper suspension connector; 13. Shock absorber; 14. Spring seat; 15. Fixing nut. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0026] like Figure 1-5 As shown, the suspension strut assembly with polyurethane external buffer block includes a lower suspension connector 1, on which a shock absorber 13 and a spring seat 14 are fixedly mounted, with the shock absorber 13 located inside the spring seat 14.

[0027] The lower cylinder 5 is fixedly installed on the top of the shock absorber 13 and the spring seat 14. The lower cylinder 5 is provided with several alignment through holes 6 arranged equidistantly from top to bottom.

[0028] The upper cylinder 7 is slidably installed inside the top of the lower cylinder 5;

[0029] Adjustment mechanism 8, installed inside upper cylinder 7, includes upper fixed plate 81, threaded sleeve 82, adjusting nut 83, upper spring piece 84, protruding post 85, lower spring piece 86, and lower fixed plate 87; upper fixed plate 81 and lower fixed plate 87 are respectively fixed to the top and bottom of upper cylinder 7; threaded sleeve 82 is threaded through upper fixed plate 81; lower spring piece 86 is fixed to the top surface of lower fixed plate 87, and protruding post 85 is fixed to its top; upper spring piece 84 is fixed to the top of the two protruding posts 85, and its top end corresponds to the bottom end of threaded sleeve 82;

[0030] The polyurethane buffer mechanism 3 is sleeved and installed between the lower suspension connector 1 and the lower cylinder 5 and located outside the spring seat 14; it includes an inner reinforcing frame 31, a middle buffer layer 32 and an outer protective shell 33 from the inside out; the inner reinforcing frame 31 is made of nylon glass fiber composite material, the middle buffer layer 32 is made of microporous foamed polyurethane, and the outer protective shell 33 is made of thermoplastic polyurethane coating; the side wall of the polyurethane buffer mechanism 3 is provided with a segmented stress relief structure, including raised rings and recessed grooves that are alternately distributed along the axial direction.

[0031] In this embodiment, the central axis of the raised ring and the central axis of the recessed groove are staggered, and a helical spring is embedded inside the raised ring, with both ends of the helical spring fixed to the inner reinforcing skeleton 31. The staggered arrangement of the central axes of the raised ring and the recessed groove, along with the built-in helical spring, enhances the lateral torsional stiffness, and the buffer mechanism 3 can absorb energy through multi-directional deformation.

[0032] In this embodiment, a return spring 88 is fixedly installed between the two protruding posts 85. The upper cylinder 7 is provided with two through slots, and the two protruding posts 85 slide through the corresponding through slots respectively, with the protruding posts 85 corresponding to the alignment through holes 6. The return spring 88 forces the protruding posts 85 to reset and insert into the alignment through holes 6, preventing locking failure after adjustment.

[0033] In this embodiment, a lower blocking ring 2 is fixed at the top of the lower suspension connector 1 at the bottom of the polyurethane buffer mechanism 3, and a spiral fixing ring 4 is threaded onto the bottom of the outer surface of the lower cylinder 5. The polyurethane buffer mechanism 3 is confined between the spiral fixing ring 4 and the lower blocking ring 2. The spiral fixing ring 4 can be screwed to adjust the preload, adapting to the compression requirements of the buffer mechanism 3 under different working conditions.

[0034] In this embodiment, a support frame 9 is fixed to the top of the upper cylinder 7, and a fixing plate 10 is fixed to the top of the support frame 9.

[0035] In this embodiment, a fixing nut 15 is threaded through the fixed disk 10. One end of the fixing nut 15 is rotatably connected to the rotating disk 11. An upper suspension connector 12 is fixed to the top of the rotating disk 11, and a locking tooth is provided between the fixed disk 10 and the rotating disk 11. The support frame 9 and the fixed disk 10 form a modular upper connection end. The locking tooth structure allows the upper suspension connector 12 to rotate and be positioned in multiple directions, while improving the limiting force and strength.

[0036] Working principle: Initial state: The protruding post 85 is inserted into the alignment through hole 6 of the lower cylinder 5 under the action of the return spring 88, and the upper cylinder 7 is locked with the lower cylinder 5.

[0037] Height adjustment process: Unlocking: Tightening the adjusting nut 83 drives the threaded sleeve 82 to move down, pressing the upper spring piece 84 to retract inward, driving the two protruding pillars 85 to overcome the tension of the return spring 88 and retract towards the center, disengaging from the alignment through hole 6;

[0038] Sliding positioning: The upper cylinder 7 can slide freely along the axis of the lower cylinder 5. By rotating the upper cylinder 7, the protruding column 85 is aligned with the alignment through hole 6 at the target height.

[0039] Locking: Tighten the adjusting nut 83 in the reverse direction to lift the threaded sleeve 82, release the pressure on the upper spring 84, and the protruding post 85 will return to its original position under the action of the return spring 88, and be inserted into the alignment through hole 6 to complete the locking.

[0040] Buffering process: When the suspension is subjected to impact compression, the lower suspension connector 1 moves upward to compress the polyurethane buffer mechanism 3, and the intermediate buffer layer 32 absorbs energy through the microporous structure; the raised ring and the recessed groove deform alternately, guiding the stress to be released in segments along the axial direction, and the inner reinforcing skeleton 31 restricts excessive deformation; after the impact ends, the microporous structure of the intermediate buffer layer 32 releases the stored energy and pushes the lower suspension connector 1 to reset.

[0041] The circuits, electronic components, and control modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the software and methods.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A suspension strut assembly with a polyurethane external buffer block, characterized in that: It includes a lower suspension connector (1), on which a shock absorber (13) and a spring seat (14) are fixedly installed, the shock absorber (13) being located inside the spring seat (14); The lower cylinder (5) is fixedly installed on the top of the shock absorber (13) and the spring seat (14). The lower cylinder (5) is provided with a number of alignment through holes (6) arranged equidistantly from top to bottom. The upper cylinder (7) is slidably installed at the top of the inside of the lower cylinder (5); The adjusting mechanism (8) is installed inside the upper cylinder (7) and includes an upper fixing plate (81), a threaded sleeve (82), an adjusting nut (83), an upper spring plate (84), a protruding column (85), a lower spring plate (86), and a lower fixing plate (87). The upper fixing plate (81) and the lower fixing plate (87) are respectively fixed to the top and bottom of the upper cylinder (7). The threaded sleeve (82) is threaded through the upper fixing plate (81). The lower spring plate (86) is fixed to the top surface of the lower fixing plate (87), and the protruding column (85) is fixed to its top. The upper spring plate (84) is fixed to the top of the two protruding columns (85), and its top end corresponds to the bottom end of the threaded sleeve (82). The polyurethane buffer mechanism (3) is sleeved and installed between the lower suspension connector (1) and the lower cylinder (5) and located outside the spring seat (14); it includes an inner reinforcing skeleton (31), an intermediate buffer layer (32) and an outer protective shell (33) from the inside out; the inner reinforcing skeleton (31) is made of nylon glass fiber composite material, the intermediate buffer layer (32) is made of microporous foamed polyurethane, and the outer protective shell (33) is made of thermoplastic polyurethane coating; the side wall of the polyurethane buffer mechanism (3) is provided with a segmented stress relief structure, including raised rings and recessed grooves that are alternately distributed along the axial direction.

2. The suspension strut assembly with polyurethane external buffer block according to claim 1, characterized in that: The central axis of the raised ring and the central axis of the recessed groove are staggered and offset, and a helical spring is embedded inside the raised ring. The two ends of the helical spring are fixed to the inner reinforcing skeleton (31).

3. The suspension strut assembly with polyurethane external buffer block according to claim 1, characterized in that: A reset spring (88) is fixedly installed between the two protruding columns (85). The upper cylinder (7) is provided with two through slots. The two protruding columns (85) slide through the corresponding through slots respectively, and the protruding columns (85) are in position corresponding to the alignment through holes (6).

4. The suspension strut assembly with polyurethane external buffer block according to claim 1, characterized in that: The top of the lower suspension connector (1) is fixed with a lower blocking ring (2) at the bottom of the polyurethane buffer mechanism (3). The bottom of the outer surface of the lower cylinder (5) is threaded with a spiral fixing ring (4). The polyurethane buffer mechanism (3) is limited between the spiral fixing ring (4) and the lower blocking ring (2).

5. The suspension strut assembly with polyurethane external buffer block according to claim 1, characterized in that: The upper cylinder (7) is fixed with a support frame (9) at its top, and a fixing plate (10) is fixed with the top of the support frame (9).

6. The suspension strut assembly with polyurethane external buffer block according to claim 5, characterized in that: The fixed disk (10) is threaded through and fitted with a fixed nut (15). One end of the fixed nut (15) is rotatably connected to the rotating disk (11). The top of the rotating disk (11) is fixed with an upper suspension connector (12), and there are locking teeth between the fixed disk (10) and the rotating disk (11).

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