Piston ring and engine

Abstract

The utility model provides a piston ring and an engine, and relates to the technical field of vehicle parts. The piston ring of the utility model has an opening, and is provided with a first blind hole, and at least one second blind hole is provided on each side between the first blind hole of the piston ring and the opening; the first blind hole and the second blind hole are both located on the inner circumference of the piston ring and extend along the radial direction of the piston ring. The first blind hole and the second blind hole are provided inside the piston ring of the utility model, which can improve the compliance of the piston ring, reduce the overall elastic force of the piston ring, reduce friction power consumption, and improve the sealing performance between the piston ring and the cylinder liner.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle parts, in particular to a piston ring and an engine. Background Art

[0002] High burst pressure and high power will be one of the main features of the next generation engine technology upgrade, and high burst pressure and power will put forward more stringent requirements on engine performance. As one of the core components of the engine, the engine piston will face the challenges of higher blowby volume and oil consumption performance requirements. For clean energy fuel engines such as hydrogen, natural gas, and methanol, extremely low blowby volume and extremely low oil consumption requirements put forward higher requirements on the design of the piston.

[0003] When the piston ring is installed in the cylinder liner, the stress on the piston ring is the smallest on the opening side of the piston ring, while the stress on the side opposite to the opening side of the piston ring is the largest. Existing integral piston rings are prone to leakage at the opening position of the piston ring, indicating that the outer side of the piston ring and the inner circumference of the cylinder liner cannot be well sealed. Designing holes or grooves on the piston ring will improve the compliance of the piston ring, so that the piston ring and the cylinder liner fit tightly to meet the sealing requirements. In the prior art, there is a method of designing through holes or grooves on the piston ring to improve the compliance of the piston ring. However, the through holes in the prior art not only greatly reduce the sealing performance of the piston ring, but also increase the wear between the piston ring and the ring groove, reducing the fatigue resistance of the piston ring. Utility Model Content

[0004] An object of the first aspect of the utility model is to provide a piston ring to solve the problem of poor compliance leading to poor sealing in the prior art.

[0005] An object of the second aspect of the present invention is to provide an engine comprising the above-mentioned piston ring.

[0006] In particular, the utility model provides a piston ring having an opening, and the piston ring is provided with a first blind hole, and at least one second blind hole is provided on each side between the first blind hole and the opening of the piston ring; the first blind hole and the second blind hole are both located on the inner circumferential surface of the piston ring and extend radially along the piston ring.

[0007] Optionally, the first blind hole is provided at a position of the piston ring opposite to the opening, and radial dimensions of the first blind hole and the second blind hole are both smaller than or equal to 45% of a minimum thickness of the piston ring.

[0008] Optionally, the total number of the first blind holes and the second blind holes is less than or equal to 9, and the number of the second blind holes is an even number.

[0009] Optionally, centers of the first blind hole and the second blind hole are both located in the middle of the piston ring in the height direction.

[0010] Optionally, the second blind holes distributed on both sides between the first blind hole and the opening of the piston ring are mirror-symmetrical.

[0011] Optionally, the density, diameter and / or depth of the second blind holes are different from the first blind holes to the opening position.

[0012] Optionally, the second blind holes are evenly distributed between the first blind holes and the opening, but radial dimensions of the second blind holes gradually increase and / or depths of the second blind holes gradually increase from the first blind holes to the opening.

[0013] Optionally, a radial dimension of the second blind hole is greater than a radial dimension of the first blind hole, and a radial dimension of the second blind hole gradually increases from the first blind hole to the opening position.

[0014] Optionally, the depth of the second blind hole is greater than the depth of the first blind hole, and the depth of the second blind hole gradually increases from the first blind hole to the opening position.

[0015] Optionally, the density of the second blind holes gradually decreases from the first blind holes to the opening position.

[0016] Optionally, the first blind hole and / or the second blind hole is at least partially cut by the upper surface of the piston ring to open to the upper surface, or is cut by the lower surface of the piston ring to open to the lower surface.

[0017] Optionally, the opening of the first blind hole or the second blind hole faces the upper surface or the lower surface. Since the first blind hole and the second blind hole are both located on the inner circumference of the piston ring, this design enables the first blind hole and / or the second blind hole to be at least partially cut by the inner surface of the piston ring and open to the inner surface.

[0018] Optionally, the first blind hole and the second blind hole have the same size, form, etc., and are symmetrically arranged along a straight line from the opening to the relative position of the opening, with the density gradually decreasing from the opening to the relative position of the opening.

[0019] According to the above design, the first blind hole and / or the second blind hole may be at least partially cut open by the upper surface of the piston ring to open to the upper surface, or may be cut open by the lower surface of the piston ring to open to the lower surface.

[0020] As another embodiment, optionally, the opening of the first blind hole or the second blind hole faces the upper surface or the lower surface. Similarly, since the first blind hole and the second blind hole are both located on the inner circumference of the piston ring, this design enables the first blind hole and / or the second blind hole to be at least partially cut by the inner surface of the piston ring and open to the inner surface.

[0021] In particular, the utility model provides an engine, comprising the piston ring mentioned above.

[0022] The piston ring of the present invention is provided with an opening, and the piston ring is also provided with a first blind hole, and at least one second blind hole is provided between the first blind hole and the opening, and the first blind hole and the second blind hole are both provided on the inner circumference of the piston ring and extend radially, so that the compliance of the piston ring can be improved, the overall elastic force of the piston ring can be reduced, the friction power consumption can be reduced, and the sealing performance between the piston ring and the cylinder liner can be improved. In addition, the first blind hole and the second blind hole are provided on the inner circumference of the piston ring in the present invention, and they do not penetrate the piston ring, so as not to affect the sealing performance and fatigue resistance of the piston ring itself.

[0023] The radial dimension of the blind hole in the piston ring of this solution is designed to be less than or equal to 45% of the minimum thickness dimension of the piston ring in order to ensure the strength of the piston ring and avoid excessive flexibility of the piston ring due to excessive radial dimension of the blind hole, which affects the overall stiffness of the piston ring.

[0024] In this solution, the density of the second blind hole from the first blind hole to the opening position gradually decreases, the aperture gradually increases, and the depth component increases, which adapts to the stress distribution of the entire piston ring. It can not only increase the compliance of the piston ring, but also avoid the situation where the piston ring has insufficient stiffness due to excessive stress, and can optimize the performance of the piston ring.

[0025] Based on the detailed description of the specific embodiments of the present invention in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other purposes, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0027] Figure 1 is a schematic structural diagram of a piston ring according to a specific embodiment of the utility model;

[0028] Figure 2 is a cross-sectional schematic diagram of a piston ring according to a specific embodiment of the utility model;

[0029] Figure 3 is a schematic structural diagram of a piston ring according to another specific embodiment of the utility model;

[0030] Figure 4 is a schematic structural diagram of a piston ring according to another specific embodiment of the utility model;

[0031] Figure 5 is a schematic structural diagram of a piston ring according to another specific embodiment of the utility model;

[0032] Figure 6 is a schematic structural diagram of a piston ring according to another specific embodiment of the utility model;

[0033] Figure 7 is a partial schematic structural diagram of a piston ring according to another specific embodiment of the utility model;

[0034] Figure 8 It is a schematic structural diagram of a piston ring according to another specific embodiment of the utility model.

[0035] Description of reference numerals:

[0036] 100 - piston ring; 110 - opening; 120 - first blind hole; 130 - second blind hole; 140 - upper surface; 150 - lower surface; 160 - inner surface. DETAILED DESCRIPTION

[0037] In the description of this embodiment, it should be understood that the terms "length", "width", "height", "up", "down", "left", "right", "vertical", "horizontal", "bottom", "inside" and "outside" etc. indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] Figure 1 It is a schematic structural diagram of a piston ring according to a specific embodiment of the utility model. Figure 2 It is a cross-sectional schematic diagram of a piston ring according to a specific embodiment of the utility model.

[0039] As a specific embodiment of the present invention, Figure 1 and Figure 2As shown, this embodiment provides a piston ring 100, which has an opening 110, and a first blind hole 120 is arranged at a position of the piston ring 100 opposite to the opening 110, and at least one second blind hole 130 is arranged on each side between the first blind hole 120 and the opening 110 of the piston ring 100. The first blind hole 120 and the second blind hole 130 are both located on the inner circumferential surface of the piston ring 100 and extend along the radial direction of the piston ring 100.

[0040] Specifically, the piston ring 100 of the present embodiment is provided with an opening 110, and a first blind hole 120 is provided on a side opposite to the opening 110, and at least one second blind hole 130 is provided between the first blind hole 120 and the opening 110, and the first blind hole 120 and the second blind hole 130 are both provided on the inner circumference of the piston ring 100 and extend in the radial direction, so that the compliance of the piston ring 100 can be improved, the overall elastic force of the piston ring 100 can be reduced, the friction power consumption can be reduced, and the sealing performance between the piston ring 100 and the cylinder liner can be improved. In addition, in the present embodiment, the first blind hole 120 and the second blind hole 130 are provided on the inner circumference of the piston ring 100, and neither of them penetrates the piston ring 100, and will not affect the sealing performance and fatigue resistance of the piston ring 100 itself.

[0041] Specifically, the cross-sectional shape of the first blind hole 120 or the second blind hole 130 designed in the piston ring 100 of this embodiment can be rectangular, circular, trapezoidal, etc. Regardless of the cross-sectional shape of the blind hole 110, it extends along the radial direction of the piston ring 100, and the radial dimension of the blind hole 110 is less than or equal to 45% of the minimum thickness of the piston ring 100.

[0042] Specifically, in the present embodiment, the radial dimension of the first blind hole 120 and the second blind hole 130 refers to the maximum dimension of the cross-sectional shape of the first blind hole 120 and the second blind hole 130. For example, if the cross-sectional shape of the first blind hole 120 or the second blind hole 130 is circular, the radial dimension is its diameter; if the cross-sectional shape of the first blind hole 120 or the second blind hole 130 is rectangular, the radial dimension is the dimension of the diagonal, and so on.

[0043] In this embodiment, the radial dimension of the blind hole 110 is designed to be less than or equal to 45% of the minimum thickness dimension of the piston ring 100 in order to ensure the strength of the piston ring 100 and avoid the excessive flexibility of the piston ring 100 due to the excessive radial dimension of the first blind hole 120 or the second blind hole 130, thereby affecting the overall stiffness of the piston ring 100.

[0044] As a specific embodiment of the present invention, the total number of the first blind holes 120 and the second blind holes 130 in this embodiment is less than or equal to 9, and the number of the second blind holes 130 is an even number.

[0045] Specifically, since the piston ring 100 generally has an opening 110, and the stress at the position opposite to the opening 110 is the largest, it is necessary to design at least a first blind hole 120 at the position opposite to the opening 110. On the piston ring 100 between the first blind hole 120 and the opening 110, the same number of second blind holes 130 are designed on both sides, and the total number of the first blind holes 120 and the second blind holes 130 is an odd number. Since the piston ring 100 needs to be compliant and its stiffness cannot be too low, the total number of the first blind holes 120 and the second blind holes 130 on the piston ring 100 shall not be greater than 9.

[0046] As a specific embodiment of the present invention, the centers of the first blind hole 120 and the second blind hole 130 of this embodiment are both located in the middle of the piston ring 100 in the height direction.

[0047] Specifically, the centers of the first blind hole 120 and the second blind hole 130 are located in the middle of the height direction of the piston ring 100 to avoid the situation where the piston ring 100 is designed to be close to the upper side or the lower side of the piston ring 100 and thus causing the piston ring 100 to break.

[0048] As a specific embodiment of the present invention, the second blind holes 130 distributed on both sides between the first blind hole 120 and the opening 110 are mirror-symmetrical.

[0049] Specifically, in this embodiment, the shape of the piston ring 100 is symmetrical along the straight line a connecting the first blind hole 120 and the opening 110, and the stress of the piston ring 100 is also symmetrical along the straight line a. Therefore, the second blind hole 130 is designed to be mirror-symmetrical to avoid deformation of the piston ring 100 due to different stresses on both sides of the piston ring 100, thereby affecting the sealing performance.

[0050] As a specific embodiment of the present invention, the density, diameter and / or depth of the second blind hole 130 are different from the first blind hole 120 to the opening 110. The density, diameter or depth of the second blind hole 130 in this embodiment is different in order to allow the design of the second blind hole 130 to adapt to the stress of the piston ring 100, thereby ensuring the compliance of the piston ring 100 while ensuring that different positions of the piston ring 100 have different rigidities, thereby optimizing the performance of the piston ring 100.

[0051] As a specific embodiment of the present invention, the second blind holes 130 are evenly distributed between the first blind holes 120 and the opening 110, but the radial dimensions of the second blind holes 130 gradually increase from the first blind holes 120 to the opening 110 and / or the depths of the second blind holes 130 gradually increase.

[0052] Specifically, Figure 3 and Figure 4 As shown, Figure 3Shown is a uniform distribution of the second blind holes, but with a gradually increasing hole diameter. Figure 4 It is shown that the second blind holes are evenly distributed, but the depth of the holes gradually increases. In this way, the second blind holes 130 are distributed between the first blind holes 120 and the opening 110, which can effectively increase the compliance of the piston ring 100, greatly reduce the overall elastic force of the ring, and reduce friction power consumption. By adjusting the radial size or depth of the second blind holes 130, it is also possible to adapt to the stress requirements of different positions of the piston ring 100 and amplify the performance of the piston ring 100.

[0053] Figure 3 1 is a schematic structural diagram of a piston ring 100 according to another specific embodiment of the utility model. As a specific embodiment of the utility model, Figure 4 As shown, the radial dimension of the second blind hole 130 of this embodiment is greater than the radial dimension of the first blind hole 120 , and the radial dimension b of the second blind hole 130 gradually increases from the first blind hole 120 to the opening 110 .

[0054] Specifically, since the stress of the piston ring 100 gradually decreases from the first blind hole 120 to the opening 110, the radial dimension of the second blind hole 130 designed in this embodiment is larger than the radial dimension of the first blind hole 120, and the radial dimension b of the second blind hole 130 gradually increases from the position of the first blind hole 120 to the position of the opening 110, so that the radial dimension of the blind hole from the first blind hole 120 to the position of the opening 110 is gradually increased, which adapts to the stress change of the piston ring 100, can well improve the compliance of the piston ring 100, and avoid the piston ring 100 The flexibility is too large and affects the overall stiffness, and also avoids the situation where the piston ring 100 is broken due to excessive stress near the first blind hole 120.

[0055] Figure 4 : is a schematic structural diagram of a piston ring according to another specific embodiment of the utility model. As a specific embodiment of the utility model, Figure 4 As shown, the depth of the second blind hole 130 of this embodiment is greater than the depth of the first blind hole 120 , and the depth c of the second blind hole 130 gradually increases from the first blind hole 120 to the opening 110 .

[0056] Specifically, in the present embodiment, since the stress of the piston ring 100 gradually decreases from the first blind hole 120 to the opening 110, the depth of the second blind hole 130 of the present embodiment is greater than the depth of the first blind hole 120, and the depth c of the second blind hole 130 gradually increases from the first blind hole 120 to the opening 110, so that from the first blind hole 120 to the opening 110, the depth change trends of the first blind hole and the second blind hole are gradually increasing, which adapts to the stress change of the piston ring 100, avoids the blind hole near the first blind hole 120 from being too deep to cause breakage, and also avoids the situation where the depth of the second blind hole 130 near the opening 110 is too small to make the overall compliance of the piston ring 100 insufficient, thereby improving the compliance of the piston ring 100 and ensuring the rigidity of the piston ring 100.

[0057] Figure 5 1 is a schematic structural diagram of a piston ring 100 according to another specific embodiment of the utility model. As a specific embodiment of the utility model, Figure 5 As shown, the density of the second blind holes 130 of this embodiment gradually decreases from the first blind holes 120 to the opening 110 .

[0058] Specifically, for example, the distance d between the two second blind holes 130 on both sides of the first blind hole 120 is greater than the distance d' between the two second blind holes 130 on both sides of the opening 110. In other words, for the second blind hole 130 on the right side of the line connecting the first blind hole 120 and the opening 110 of the piston ring 100, the distance between the two adjacent second blind holes 130 gradually decreases from top to bottom. This design is because the stress of the piston ring 100 is small at the position close to the opening 110, and the stress is large at the position close to the first blind hole 120. The second blind holes 130 with higher density are designed at the position with lower stress, and the second blind holes 130 with lower density are designed at the position with higher stress, which adapts to the stress change of the piston ring 100, increases the compliance of the piston ring 100, and avoids the situation that the compliance is poor at the position with lower stress, and the rigidity of the piston ring 100 is insufficient at the position with higher stress.

[0059] As a specific embodiment of the present invention, in this embodiment, the increase in density, the increase in depth, and the increase in radial size of the second blind hole 130 of the piston ring 100 from the first blind hole 120 to the opening 110 can be combined in pairs, or all three can be combined together, thereby ensuring that the performance of the piston ring 100 is maximized by adjusting the density, depth and radial size of the second blind hole 130.

[0060] Figure 6 1 is a schematic structural diagram of a piston ring 100 according to another specific embodiment of the utility model. As a specific embodiment of the utility model, Figure 6As shown, the second blind hole 130 of this embodiment is the same as the first blind hole 120, that is, they are the same type of holes, that is, the first blind hole 120 and the second blind hole 130 are the same in size, form, etc. The difference of this embodiment is that these blind holes are symmetrically arranged along the straight line where the relative positions of the opening 110 to the opening 100 are located, but the density gradually decreases from the opening 110 to the relative position of the opening 110.

[0061] This design is because the stress of the piston ring 100 is small at a position close to the opening 110, and the stress is large at a position opposite to the opening 110. The blind hole design density is larger at the position with small stress, and the blind hole design density is smaller at the position with large stress. This adapts to the stress changes of the piston ring 100, increases the compliance of the piston ring 100, and avoids the situation where the compliance is poor at the position with small stress and the piston ring 100 has insufficient stiffness at the position with large stress.

[0062] According to the above design, as shown in the attached Figure 7 The first blind hole 120 and / or the second blind hole 130 are at least partially cut by the upper surface 140 of the piston ring to open to the upper surface 140 or cut by the lower surface 150 of the piston ring 100 to open to the lower surface 150 .

[0063] As another embodiment, optionally, as shown in the attached Figure 8 As shown, the opening of the first blind hole 120 or the second blind hole 130 faces the upper surface 140 or the lower surface 150. Similarly, since the first blind hole 120 and the second blind hole 130 are both located on the inner circumference of the piston ring 100, this design enables the first blind hole 120 and / or the second blind hole 130 to be at least partially cut by the inner surface 160 of the piston ring 100 and open to the inner surface 160.

[0064] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the contents disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A piston ring, characterized in that: It has an opening, and the piston ring is provided with a first blind hole, and at least one second blind hole is provided on each side between the first blind hole and the opening of the piston ring; the first blind hole and the second blind hole are both located on the inner circumference of the piston ring and extend radially along the piston ring.

2. The piston ring according to claim 1, characterized in that: The first blind hole is arranged at a position of the piston ring opposite to the opening, and radial dimensions of the first blind hole and the second blind hole are both smaller than or equal to 45% of the minimum thickness of the piston ring.

3. The piston ring according to claim 2, characterized in that: The total number of the first blind holes and the second blind holes is less than or equal to 9, and the number of the second blind holes is an even number.

4. The piston ring according to claim 2, characterized in that: The centers of the first blind hole and the second blind hole are both located in the middle of the piston ring in the height direction.

5. The piston ring according to claim 2, characterized in that: The second blind holes distributed on both sides between the first blind hole and the opening of the piston ring are mirror-symmetrical.

6. The piston ring according to any one of claims 2 to 5, characterized in that: The density, diameter and / or depth of the second blind holes are different from the first blind holes to the opening position.

7. The piston ring according to claim 6, characterized in that The second blind holes are evenly distributed between the first blind holes and the opening, and the radial dimensions of the second blind holes gradually increase and / or the depths of the second blind holes gradually increase from the first blind holes to the opening.

8. The piston ring according to claim 6, characterized in that The radial size of the second blind hole is greater than that of the first blind hole, and the radial size of the second blind hole gradually increases from the first blind hole to the opening position.

9. The piston ring according to claim 6, characterized in that The depth of the second blind hole is greater than that of the first blind hole, and the depth of the second blind hole gradually increases from the first blind hole to the opening position.

10. The piston ring according to claim 6, characterized in that The density of the second blind holes gradually decreases from the first blind holes to the opening position.

11. The piston ring according to any one of claims 2-5, 7-10, characterized in that: The first blind hole and / or the second blind hole are at least partially cut by the upper surface of the piston ring to open to the upper surface, or are cut by the lower surface of the piston ring to open to the lower surface.

12. The piston ring according to any one of claims 2-5, 7-10, characterized in that: The opening of the first blind hole or the second blind hole faces the upper surface or the lower surface.

13. The piston ring according to claim 1, characterized in that The first blind hole is identical to the second blind hole, and the blind holes are symmetrically arranged along a straight line from the opening to the relative position of the opening, and the density gradually decreases from the opening to the relative position of the opening.

14. The piston ring according to claim 13, characterized in that The first blind hole and / or the second blind hole are at least partially cut by the upper surface of the piston ring to open toward the upper surface, or are cut by the lower surface of the piston ring to open toward the lower surface.

15. The piston ring according to claim 13, characterized in that The opening of the first blind hole or the second blind hole faces the upper surface or the lower surface.

16. An engine, characterized in that: The piston ring comprises the piston ring according to any one of claims 1 to 15.

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