Hydraulic drive type variable compression ratio piston connecting rod assembly

Abstract

The utility model relates to the technical field of vehicle engine assemblies, and discloses a hydraulic drive type variable compression ratio piston connecting rod assembly which comprises a piston upper body and a piston lower body, the piston upper body and the piston lower body are mutually clamped, and a cylindrical cavity between the piston upper body and the piston lower body is a main oil cavity. A connecting rod is installed at the bottom end of the lower piston body, an elastic assembly is connected between the upper piston body and the lower piston body and comprises a first fixing ring, a second fixing ring and a first spring, and a first connecting frame and a second connecting frame are installed at the top end of the first fixing ring and the bottom end of the second fixing ring correspondingly. According to the spring fixing device, personnel can conveniently install and fix the first spring between the lower piston body and the upper piston body, the stability of the first spring after installation is guaranteed, and therefore normal connection between the upper piston body and the lower piston body is guaranteed, and normal adjustment of the compression ratio is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the technical field of automotive engine components, specifically, it relates to a hydraulically driven variable compression ratio piston connecting rod assembly. Background Technology

[0002] The compression ratio of a car engine refers to the degree to which the air-fuel mixture is compressed, expressed as the ratio of the total cylinder volume before compression to the cylinder volume after compression (i.e., the combustion chamber volume). Compression ratio is closely related to engine performance. Generally, low compression ratios are below 10, while high compression ratios are above 10. Generally, the higher the compression ratio, the greater the engine power. Assuming other engine design parameters remain constant, a higher compression ratio generally results in greater power, higher efficiency, and better fuel economy.

[0003] According to Chinese Patent Publication No. CN105626258B, a hydraulically driven variable compression ratio piston connecting rod assembly is disclosed. It changes the size of the main oil chamber by hydraulic drive, thereby changing the compression ratio of the engine. It is reliable and has a rapid response.

[0004] However, in this technical solution, the tension spring is only installed and fixed by inserting the two ends of the tension spring into the grooves opened on the lower and upper parts of the piston through the arc-shaped flat key. The arc-shaped flat key has a limiting structure in the groove, which makes it easy for the arc-shaped flat key to slide out of the groove, making it difficult for the tension spring to stably connect and fix the lower and upper parts of the piston, thus affecting the normal adjustment of the compression ratio. To this end, we propose a hydraulically driven variable compression ratio piston connecting rod assembly. Utility Model Content

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:

[0006] A hydraulically driven variable compression ratio piston-connecting rod assembly includes an upper piston body and a lower piston body, which are engaged with each other. A cylindrical cavity between the upper and lower piston bodies forms the main oil chamber. A connecting rod is mounted at the bottom of the lower piston body. An elastic component connects the upper and lower piston bodies. The elastic component includes a first fixed ring, a second fixed ring, and a first spring. A first connecting frame and a second connecting frame are respectively mounted at the top of the first fixed ring and the bottom of the second fixed ring. The first spring is installed between the first and second connecting frames. A first positioning post and a second positioning post are respectively mounted at the top of the lower piston body and the bottom of the upper piston body. Positioning holes one and two are respectively formed on the first and second fixed rings. The first and second positioning posts movably pass through the first and second positioning holes. A retaining frame is slidably connected to the top of the first fixed ring and the bottom of the second fixed ring. A retaining groove is formed on the outer wall of the first and second positioning posts, and the retaining frame engages in the retaining groove.

[0007] In a preferred embodiment of this utility model, there are four positioning posts, four positioning posts, four positioning holes, and four positioning holes. The positioning posts and two positioning posts are adapted to the positioning holes and two positioning holes, respectively. By setting the positioning posts and two positioning posts, the fixing rings can be limited respectively.

[0008] In a preferred embodiment of this utility model, the card frame is adapted to the card slot. By setting the card frame, the card frame can be inserted into the card slot, thereby fixing the first fixing ring and the second fixing ring.

[0009] In a preferred embodiment of this utility model, a limiting slider is installed on the outer wall of the card frame, and limiting grooves are formed on the outer walls of both the first and second fixing rings. The limiting slider is slidably connected to the limiting grooves, and a limiting rod is installed on the inner wall of the limiting grooves. The limiting rod movably passes through the limiting slider, and a second spring is surrounded on the outer wall of the limiting rod. The second spring is installed between one side of the limiting slider and the inner wall of the limiting groove. By setting the limiting rod, the limiting slider and the second spring can be limited, ensuring the stability of the limiting slider when sliding and the second spring when compressed.

[0010] In a preferred embodiment of this utility model, a hanging rope is installed on the outer wall of the card frame, and a hanging rod is installed on the outer wall of the first fixing ring and the second fixing ring. By setting the hanging rope and the hanging rod, when the personnel pull the card frame to move outward, the hanging rope can be hung on the hanging rod, thereby temporarily fixing the card frame without the personnel having to pull the card frame continuously, thus facilitating personnel operation.

[0011] In a preferred embodiment of this utility model, the hanging rope is made of an elastic material, such as high-temperature resistant rubber.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] This invention facilitates the installation and fixation of the spring between the lower and upper piston bodies, ensuring its stability after installation. This guarantees a proper connection between the upper and lower piston bodies and facilitates normal adjustment of the compression ratio. It solves the problem in existing technologies where the tension spring is simply fixed by inserting arc-shaped flat keys into grooves on the lower and upper piston bodies. However, the arc-shaped flat keys, while having a limiting structure within the grooves, easily slip out, making it difficult for the tension spring to stably connect and fix the lower and upper piston bodies, thus affecting the normal adjustment of the compression ratio.

[0014] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0015] In the attached diagram:

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a front sectional view of the present invention.

[0018] Figure 3 This utility model Figure 2 Enlarged structural diagram of section A in the middle;

[0019] Figure 4 This is a partial structural schematic diagram of a front cross-section of the fixing ring of this utility model;

[0020] Figure 5 This utility model Figure 4 Enlarged structural diagram of section B.

[0021] In the diagram: 1. Upper piston body; 2. Lower piston body; 3. Connecting rod; 4. Fixed ring one; 5. Fixed ring two; 6. Positioning pin one; 7. Positioning pin two; 8. Positioning hole one; 9. Positioning hole two; 10. Spring one; 11. Frame; 12. Slot; 13. Limiting slider; 14. Limiting groove; 15. Spring two; 16. Connecting frame one; 17. Connecting frame two; 18. Hanging rope; 19. Hanging rod; 20. Main oil chamber; 21. Limiting rod. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model.

[0023] like Figures 1 to 5As shown, a hydraulically driven variable compression ratio piston-connecting rod assembly includes an upper piston body 1 and a lower piston body 2, which are engaged with each other. A cylindrical cavity between the upper piston body 1 and the lower piston body 2 forms the main oil chamber 20. A connecting rod 3 is mounted at the bottom of the lower piston body 2. An elastic assembly connects the upper piston body 1 and the lower piston body 2. The elastic assembly includes a first fixing ring 4, a second fixing ring 5, and a first spring 10. A first connecting frame 16 and a second connecting frame 17 are respectively mounted at the top of the first fixing ring 4 and the bottom of the second fixing ring 5. A 10 is installed between a first connecting frame 16 and a second connecting frame 17. A first positioning post 6 and a second positioning post 7 are respectively installed at the top of the lower piston body 2 and the bottom of the upper piston body 1. A first positioning hole 8 and a second positioning hole 9 are respectively opened on a first fixing ring 4 and a second fixing ring 5. The first positioning post 6 and the second positioning post 7 are respectively movably inserted through the first positioning hole 8 and the second positioning hole 9. A retaining frame 11 is slidably connected to the top of the first fixing ring 4 and the bottom of the second fixing ring 5. A retaining groove 12 is opened on the outer wall of the first positioning post 6 and the second positioning post 7. The retaining frame 11 is engaged in the retaining groove 12.

[0024] Furthermore, there are four positioning posts 6, 7, 8, and 9. Positioning posts 6 and 7 are matched with positioning holes 8 and 9, respectively.

[0025] By setting positioning post 6 and positioning post 7, the fixing ring 6 and fixing ring 7 can be limited respectively.

[0026] Furthermore, the card frame 11 is adapted to the card slot 12.

[0027] The card frame 11 is designed so that it can be inserted into the card slot 12, thereby fixing the first fixing ring 6 and the second fixing ring 7.

[0028] Furthermore, a limiting slider 13 is installed on the outer wall of the card frame 11, and a limiting groove 14 is opened on the outer wall of both the first fixing ring 4 and the second fixing ring 5. The limiting slider 13 is slidably connected to the limiting groove 14. A limiting rod 21 is installed on the inner wall of the limiting groove 14. The limiting rod 21 moves through the limiting slider 13. A spring 2 15 is surrounded on the outer wall of the limiting rod 21. The spring 2 15 is installed between one side of the limiting slider 13 and the inner wall of the limiting groove 14.

[0029] The limiting rod 21 can limit the movement of the limiting slider 13 and the second spring 15, ensuring the stability of the limiting slider 13 during sliding and the second spring 15 during compression.

[0030] Furthermore, a hanging rope 18 is installed on the outer wall of the card frame 11, and a hanging rod 19 is installed on the outer wall of the first fixing ring 4 and the second fixing ring 5.

[0031] By setting up a hanging rope 18 and a hanging rod 19, when personnel pull the card frame 11 to move it outward, the hanging rope 18 can be hung on the hanging rod 19, thereby temporarily fixing the card frame 11 without requiring personnel to pull the card frame 11 continuously, thus facilitating personnel operation.

[0032] Furthermore, the lanyard 18 is made of an elastic material, such as high-temperature resistant rubber.

[0033] The implementation principle of a hydraulically driven variable compression ratio piston connecting rod assembly is as follows: In use, according to the announcement number CN105626258B, patent name "Hydraulically Driven Variable Compression Ratio Piston Connecting Rod Assembly," it can be seen that by changing the volume of the main oil chamber 20, the compression ratio can be adjusted. During installation, the spring 10 is first pulled by pulling the retaining frame 11 on the fixing ring 25, causing the retaining frame 11 to drive the limiting slider 13 to compress the spring 25, so that the retaining frame 11 is not below the positioning hole 29. Then, the fixing ring 25 is installed into the piston upper body 1, allowing the positioning pin 27 to move through the positioning hole 29. Then, the retaining frame 11 is released, at which point the limiting slider 13, under the reset force of the spring 25, will drive the retaining frame 11 into the retaining groove 12, thereby fixing the fixing ring 25 on the piston upper body 1. Then, the retaining frame 11 on the fixing ring 14 is pulled, so that the retaining frame 11 is not above the positioning hole 18. Then, the fixing ring 14 is installed into the piston lower body 2, allowing the positioning pin 6 to move through the positioning hole 19. The movement passes through the positioning hole 8, and then the retaining frame 11 is released. The retaining frame 11 will then be engaged in the retaining groove 12 under the restoring force of the spring 15, thereby fixing the retaining ring 4 on the lower piston body 2. This completes the installation of the elastic component between the upper piston body 1 and the lower piston body 2. Through the above structure, it is convenient for personnel to install and fix the spring 10 between the lower piston body 2 and the upper piston body 1, and the stability of the spring 10 after installation is ensured. This ensures the normal connection between the upper piston body 1 and the lower piston body 2, and the normal adjustment of the compression ratio. This solves the problem in the existing technical solution where the tension spring is only installed and fixed by inserting the two ends of the tension spring into the grooves opened on the lower piston body 2 and the upper piston body 1 through the arc-shaped flat key. However, the arc-shaped flat key has a limiting structure in the groove, which makes it easy for the arc-shaped flat key to slide out of the groove, making it difficult for the tension spring to achieve a stable connection and fixation between the lower piston body 2 and the upper piston body 1, thus affecting the normal adjustment of the compression ratio.

Claims

1. A hydraulically driven variable compression ratio piston-connecting rod assembly, comprising an upper piston body (1) and a lower piston body (2), wherein the upper piston body (1) and the lower piston body (2) are engaged with each other, the cylindrical cavity between the upper piston body (1) and the lower piston body (2) is a main oil chamber (20), and a connecting rod (3) is installed at the bottom end of the lower piston body (2), characterized in that, An elastic assembly connects the upper piston body (1) and the lower piston body (2). The elastic assembly includes a first fixing ring (4), a second fixing ring (5), and a first spring (10). A first connecting frame (16) and a second connecting frame (17) are respectively installed at the top of the first fixing ring (4) and the bottom of the second fixing ring (5). The first spring (10) is installed between the first connecting frame (16) and the second connecting frame (17). A first positioning pin (6) and a second positioning pin (7) are respectively installed at the top of the lower piston body (2) and the bottom of the upper piston body (1). Positioning post 2 (7), positioning hole 1 (8) and positioning hole 2 (9) are respectively opened on the fixing ring 1 (4) and fixing ring 2 (5), positioning post 1 (6) and positioning post 2 (7) respectively movably pass through positioning hole 1 (8) and positioning hole 2 (9), the top end of fixing ring 1 (4) and the bottom end of fixing ring 2 (5) are slidably connected with a frame (11), and the outer wall of positioning post 1 (6) and positioning post 2 (7) are provided with a slot (12), and the frame (11) is engaged in the slot (12).

2. The hydraulically driven variable compression ratio piston-connecting rod assembly according to claim 1, characterized in that, The number of positioning post one (6), positioning post two (7), positioning hole one (8) and positioning hole two (9) are all four. Positioning post one (6) and positioning post two (7) are adapted to positioning hole one (8) and positioning hole two (9) respectively.

3. The hydraulically driven variable compression ratio piston-connecting rod assembly according to claim 1, characterized in that, The card frame (11) is adapted to the card slot (12).

4. The hydraulically driven variable compression ratio piston-connecting rod assembly according to claim 1, characterized in that, The outer wall of the card frame (11) is equipped with a limiting slider (13). The outer walls of the first fixing ring (4) and the second fixing ring (5) are both provided with limiting grooves (14). The limiting slider (13) is slidably connected to the limiting groove (14). The inner wall of the limiting groove (14) is equipped with a limiting rod (21). The limiting rod (21) moves through the limiting slider (13). The outer wall of the limiting rod (21) is surrounded by a second spring (15). The second spring (15) is installed between one side of the limiting slider (13) and the inner wall of the limiting groove (14).

5. A hydraulically driven variable compression ratio piston-connecting rod assembly according to claim 1, characterized in that, The outer wall of the card frame (11) is equipped with a hanging rope (18), and the outer walls of the first fixing ring (4) and the second fixing ring (5) are equipped with hanging rods (19).

6. A hydraulically driven variable compression ratio piston-connecting rod assembly according to claim 5, characterized in that, The hanging rope (18) is made of elastic material.

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