A type of variable pitch shock absorber

Abstract

This utility model discloses a variable-pitch shock absorber, relating to the field of shock absorbers. It includes a lower fixed plate and an upper fixed plate, with guide rods fixedly connected between them. A first sliding plate and a second sliding plate are slidably connected between the guide rods. A second buffer spring is provided between the first and second sliding plates, and a first buffer spring is provided between the second sliding plate and the lower fixed plate. A hydraulic cylinder with an upward-facing opening is fixedly connected to the center of the lower fixed plate. A piston rod assembly is provided inside the hydraulic cylinder. The piston rod assembly includes a piston rod, with a hydraulic piston slidably connected to the lower end of the piston rod. A buffer air cylinder with a downward-facing opening is fixedly connected to the middle of the piston rod, and the buffer air cylinder is slidably and sealed to the hydraulic cylinder. A switching nut is screwed onto the upper end of the piston rod. This device has a simple and reliable structure, facilitates switching between equal and double line spacing, and provides air pressure buffering, further improving the buffering effect.

Description

Technical Field

[0001] This utility model belongs to the field of shock absorbers, specifically relating to a variable pitch shock absorber. Background Technology

[0002] Variable pitch shock absorbers, also known as variable pitch spring shock absorbers or progressive spring shock absorbers, are passive shock absorbers that create non-linear elastic characteristics by non-uniformly changing the spring pitch (lead pitch), thereby achieving changes in damping characteristics. This provides different support forces at different compression strokes, balancing comfort and support, preventing bottoming out, improving vehicle control, and features a simple and reliable structure, relatively low cost, and no need for external control.

[0003] Patent application CN202510273958.6 discloses a hydraulic shock absorber for automotive suspension, comprising a shock absorber piston cylinder, a variable pitch spring assembly, and a pitch-changing device. The variable pitch spring assembly consists of a pair of springs with different pitches stacked on top of each other to form a double-pitch spring, which is fitted around the outer periphery of the shock absorber piston cylinder, with its lower end fixedly connected to the lower end of the piston cylinder. The pitch-changing device is rotatably mounted on the upper outer periphery of the shock absorber piston cylinder, rotatably connected to the piston rod, and slides up and down along the outer wall of the shock absorber cylinder. The upper part of the pitch-changing device is rotatably connected to the upper part of the variable pitch spring assembly. This device allows the shock absorber spring to switch between equal pitch and double pitch, selecting the appropriate spring according to different road conditions to provide a more suitable shock absorption and rebound feedback. However, the structure of the switching mechanism of the above device is complex, making it inconvenient to switch between equal pitch and double pitch, and the buffering effect needs further improvement. Utility Model Content

[0004] To address the problems mentioned in the background section, this utility model provides a variable-pitch shock absorber with a simple and reliable structure, convenient switching between equal and double line spacing, and air pressure buffering to further improve the buffering effect.

[0005] To achieve the above objectives, the specific technical solution of this utility model is as follows: A variable-pitch shock absorber includes a lower fixed plate and an upper fixed plate. Guide rods are fixedly connected between the four corners of the lower and upper fixed plates. A first sliding plate and a second sliding plate are slidably connected between the guide rods. A second buffer spring is provided between the first and second sliding plates. A first buffer spring is provided between the second sliding plate and the lower fixed plate. A hydraulic cylinder with an upward opening is fixedly connected to the center of the lower fixed plate. A piston rod device is provided inside the hydraulic cylinder. The piston rod device includes a piston rod. A hydraulic piston that is slidably connected to the inner wall of the hydraulic cylinder is fixedly connected to the lower end of the piston rod. A buffer air cylinder with a downward opening is fixedly connected to the middle position of the piston rod. The buffer air cylinder is slidably and sealed to the hydraulic cylinder. The piston rod extends upward through the first sliding plate and the upper fixed plate. A locking thread is opened at the upper end of the piston rod. A switching nut located above the upper fixed plate is screwed onto the locking thread.

[0006] As a further feature of the above solution, a sealing cover is fixedly connected to the upper end of the hydraulic cylinder. The diameter of the sealing cover is larger than the diameter of the outer wall of the hydraulic cylinder, and the sealing cover is slidably and sealingly connected to the piston rod and the inner wall of the buffer cylinder.

[0007] As a further feature of the above scheme, the lower fixed plate has a mounting hole at its center for fixing and mounting the hydraulic cylinder, the upper fixed plate has a clearance hole at its center, the first sliding plate has a first guide hole at its center, and the second sliding plate has a second guide hole at its center. The mounting hole, clearance hole, first guide hole, and second guide hole are coaxial with each other. The diameter of the clearance hole is larger than the diameter of the first guide hole, and the second guide hole is slidably connected to the outer wall of the hydraulic cylinder.

[0008] As a further feature of the above scheme, the first buffer spring and the second buffer spring have different pitches. The lower end of the first buffer spring is fixedly connected to the lower fixed plate, the upper end of the first buffer spring is fixedly connected to the second sliding plate, the lower end of the second buffer spring is fixedly connected to the second sliding plate, and the upper end of the second buffer spring is fixedly connected to the first sliding plate.

[0009] As a further feature of the above scheme, a connecting rod is fixedly connected to the upper end of the piston rod, and a connecting rod is fixedly connected to the lower end of the hydraulic cylinder.

[0010] This utility model has the following beneficial effects: In the equal spacing mode, when the piston rod and hydraulic piston slide downwards in the hydraulic cylinder, the buffer air cylinder drives the second sliding plate to move downwards, and the first buffer spring is compressed to provide a buffering effect. The second buffer spring and the first sliding plate descend synchronously and do not provide a buffering effect. When switching to the double spacing mode, the switching nut is turned downwards. The switching nut passes through the clearance hole and abuts against the first sliding plate. When the piston rod and hydraulic piston slide downwards in the hydraulic cylinder, the buffer air cylinder drives the second sliding plate to move downwards, and the switching nut synchronously drives the first sliding plate to descend. At this time, the first and second buffer springs are compressed synchronously and provide a buffering effect. This device has a simple and reliable structure, and the switching between equal spacing and double spacing is convenient, greatly improving the applicability of the device.

[0011] When this device is working, the sealing cover moves upward relative to the buffer cylinder, compressing the gas inside the buffer cylinder. The high-pressure gas plays a buffering role and assists the first and second buffer springs, further improving the buffering effect. Attached Figure Description

[0012] Figure 1 This is a cross-sectional schematic diagram of the present invention; Figure 2 This is an assembly diagram of the buffer spring mechanism of this utility model; Figure 3This is a schematic diagram of the piston rod device of this utility model; Figure 4 This is an assembly diagram of the hydraulic cylinder and the second sliding plate of this utility model.

[0013] 1. Lower fixing plate; 101. Mounting hole; 2. Upper fixing plate; 201. Clearance hole; 3. Guide rod; 4. First sliding plate; 401. First guide hole; 5. Second sliding plate; 501. Second guide hole; 6. Hydraulic cylinder; 601. Sealing cover; 7. Piston rod assembly; 701. Piston rod; 7011. Locking thread; 702. Hydraulic piston; 703. Buffer air cylinder; 704. Switching nut; 9. Connecting rod; 10. First buffer spring; 11. Second buffer spring. Detailed Implementation

[0014] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following will refer to the appendix... Figures 1-4 This application will be described in detail with reference to the embodiments.

[0016] A variable-pitch shock absorber includes a lower fixed plate 1 and an upper fixed plate 2. Guide rods 3 are fixedly connected between the four corners of the lower fixed plate 1 and the upper fixed plate 2. A first sliding plate 4 and a second sliding plate 5 are slidably connected between the guide rods 3. A second buffer spring 11 is provided between the first sliding plate 4 and the second sliding plate 5. A first buffer spring 10 is provided between the second sliding plate 5 and the lower fixed plate 1. A hydraulic cylinder 6 with an upward opening is fixedly connected at the center of the lower fixed plate 1. A piston rod device 7 is provided inside the hydraulic cylinder 6. The piston rod device 7 includes a piston rod 701. A hydraulic piston 702 that is slidably connected to the inner wall of the hydraulic cylinder 6 is fixedly connected to the lower end of the piston rod 701. A buffer air cylinder 703 with a downward opening is fixedly connected to the middle position of the piston rod 701. The buffer air cylinder 703 is slidably and sealedly connected to the hydraulic cylinder 6. The piston rod 701 extends upward through the first sliding plate 4 and the upper fixed plate 2. A locking thread 7011 is opened at the upper end of the piston rod 701. A switching nut 704 located above the upper fixed plate 2 is screwed onto the locking thread 7011.

[0017] A connecting rod 9 is fixedly connected to the upper end of the piston rod 701, and a connecting rod 9 is fixedly connected to the lower end of the hydraulic cylinder 6.

[0018] like Figure 4 As shown, a sealing cover 601 is fixedly connected to the upper end of the hydraulic cylinder 6. The diameter of the sealing cover 601 is larger than the outer wall diameter of the hydraulic cylinder 6. The sealing cover 601 is slidably and sealed to the piston rod 701 and the inner wall of the buffer air cylinder 703.

[0019] like Figure 2 , Figure 3 As shown, the lower fixed plate 1 has a mounting hole 101 at its center, which is used to fix and install the hydraulic cylinder 6. The upper fixed plate 2 has a clearance hole 201 at its center. The first sliding plate 4 has a first guide hole 401 at its center. The second sliding plate 5 has a second guide hole 501 at its center. The mounting hole 101, clearance hole 201, first guide hole 401 and second guide hole 501 are coaxial with each other. The diameter of the clearance hole 201 is larger than the diameter of the first guide hole 401. The second guide hole 501 is slidably connected to the outer wall of the hydraulic cylinder 6. The sealing cover 601 limits the movement of the second sliding plate 5.

[0020] The first buffer spring 10 and the second buffer spring 11 have different pitches. The lower end of the first buffer spring 10 is fixedly connected to the lower fixed plate 1, the upper end of the first buffer spring 10 is fixedly connected to the second sliding plate 5, the lower end of the second buffer spring 11 is fixedly connected to the second sliding plate 5, and the upper end of the second buffer spring 11 is fixedly connected to the first sliding plate 4.

[0021] The working process of this utility model is as follows: In the equal spacing mode, when the piston rod 701 and the hydraulic piston 702 slide downward in the hydraulic cylinder 6, the buffer air cylinder 703 abuts against the second sliding plate 5, causing the second sliding plate 5 to move downward. The first buffer spring 10 is compressed and plays a buffering role. The second buffer spring 11 and the first sliding plate 4 descend synchronously and do not play a buffering role. When it is necessary to switch to the double spacing mode, the switching nut 704 is turned downward. The switching nut 704 abuts against the first sliding plate 4 through the clearance hole 201. When the piston rod 701 and the hydraulic piston 702 slide downward in the hydraulic cylinder 6, the buffer air cylinder 703 drives the second sliding plate 5 to move downward. The switching nut 704 synchronously drives the first sliding plate 4 to descend. At this time, the first buffer spring 10 and the second buffer spring 11 are compressed synchronously and play a buffering role.

[0022] When the first buffer spring 10 and the second buffer spring 11 are compressed, the sealing cover 601 moves upward relative to each other inside the buffer cylinder 703, compressing the gas inside the buffer cylinder 703. The high-pressure gas plays a buffering role and provides an auxiliary role for the first buffer spring 10 and the second buffer spring 11.

[0023] It should be noted that the locking thread 7011 is coated with a solid lubricant such as grease to prevent the locking thread 7011 from affecting the movement of the piston rod 701 when it moves in the first guide hole 401.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

Claims

1. A variable-pitch shock absorber, comprising a lower fixed plate and an upper fixed plate, wherein guide rods are fixedly connected between the four corners of the lower fixed plate and the upper fixed plate, characterized in that, A first sliding plate and a second sliding plate are slidably connected between the guide rods. A second buffer spring is provided between the first sliding plate and the second sliding plate. A first buffer spring is provided between the second sliding plate and the lower fixed plate. A hydraulic cylinder with an upward opening is fixedly connected at the center of the lower fixed plate. A piston rod device is provided inside the hydraulic cylinder. The piston rod device includes a piston rod. A hydraulic piston that is slidably connected to the inner wall of the hydraulic cylinder is fixedly connected to the lower end of the piston rod. A buffer air cylinder with a downward opening is fixedly connected to the middle position of the piston rod. The buffer air cylinder is slidably and sealed to the hydraulic cylinder. The piston rod extends upward through the first sliding plate and the upper fixed plate. A locking thread is opened at the upper end of the piston rod. A switching nut located above the upper fixed plate is screwed onto the locking thread.

2. The variable pitch shock absorber according to claim 1, characterized in that, A sealing cover is fixedly connected to the upper end of the hydraulic cylinder. The diameter of the sealing cover is larger than the diameter of the outer wall of the hydraulic cylinder. The sealing cover is slidably sealed to the piston rod and the inner wall of the buffer cylinder.

3. The variable-pitch shock absorber according to claim 1, characterized in that, The lower fixed plate has a mounting hole at its center, the upper fixed plate has a clearance hole at its center, the first sliding plate has a first guide hole at its center, and the second sliding plate has a second guide hole at its center. The mounting hole, clearance hole, first guide hole, and second guide hole are coaxial with each other. The diameter of the clearance hole is larger than the diameter of the first guide hole. The second guide hole is slidably connected to the outer wall of the hydraulic cylinder.

4. The variable pitch shock absorber according to claim 1, characterized in that, The first buffer spring and the second buffer spring have different pitches. The lower end of the first buffer spring is fixedly connected to the lower fixed plate, and the upper end of the first buffer spring is fixedly connected to the second sliding plate. The lower end of the second buffer spring is fixedly connected to the second sliding plate, and the upper end of the second buffer spring is fixedly connected to the first sliding plate.

5. The variable pitch shock absorber according to claim 1, characterized in that, A connecting rod is fixedly connected to the upper end of the piston rod, and a connecting rod is fixedly connected to the lower end of the hydraulic cylinder.

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