Piston ring, air cylinder and engine

Abstract

The utility model belongs to the technical field of engines, and discloses a piston ring, an air cylinder and an engine, the piston ring comprises a ring body and a protection ring, and the ring body is used for sleeving the peripheral wall of a piston; the protection ring is provided with the heat insulation part and the connecting part which are connected with each other, the heat insulation part is arranged at the end, close to the combustion chamber, of the ring body and can play a role in heat insulation and absorption of pressure impact of the combustion chamber, when the engine knocks, the heat insulation part can absorb high-temperature and high-frequency pressure fluctuation, and therefore the effect of protecting the ring body is achieved. The connecting part is arranged on the outer wall or the inner wall of the ring body, one of the ring body and the connecting part is convexly provided with a positioning bulge, the other one of the ring body and the connecting part is provided with a positioning groove, and the positioning bulge is inserted into the positioning groove, so that the ring body and the connecting part are limited in the axial direction of the piston, and the connecting stability is improved; the ring body and the protection ring can be prevented from being separated from each other.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine, especially piston ring, cylinder and engine. BACKGROUND

[0002] Knocking is an abnormal combustion state in the engine, which can cause high frequency and large amplitude fluctuation of in-cylinder pressure, and the temperature in the combustion chamber is abnormally high, which can produce a huge impact force on the piston ring. Under high temperature conditions, the performance of the piston ring material decreases, the elasticity decreases, and the strong shock wave generated by the knocking can cause plastic deformation of the piston ring, resulting in a decrease in the sealing ability of the piston ring, and further causing large air leakage and piston necking problems.

[0003] In order to avoid the impact of knocking on the piston ring, the prior art provides a piston ring, the top surface of the piston ring is provided with a thermal suppression layer, the thermal suppression layer is arranged opposite to the combustion chamber, which can block the heat, so that the heat of the combustion chamber is difficult to enter the piston ring, thereby playing a role in protecting the piston ring. However, the problem is that the thermal suppression layer is arranged on the top surface of the piston ring, and the piston ring needs to reciprocate with the piston, and the thermal suppression layer and the piston ring are only one face fitting. In the process of movement of the piston ring, the thermal suppression layer may fall off from the piston ring. SUMMARY

[0004] According to one aspect of the present utility model, the utility model provides a piston ring to solve the problem that in the prior art, the thermal suppression layer and the piston ring are only one face fitting, and in the process of movement of the piston ring, the thermal suppression layer may fall off from the piston ring.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] The piston ring comprises:

[0007] The ring body is used for being sleeved on the outer peripheral wall of the piston;

[0008] The protective ring has a heat insulation part and a connecting part connected with each other, the heat insulation part is arranged at one end of the ring body close to the combustion chamber, the connecting part is arranged on the outer wall or the inner wall of the ring body, one of the ring body and the connecting part is provided with a positioning protrusion, and the other has a positioning groove, and the positioning protrusion is inserted into the positioning groove.

[0009] As a preferred scheme of the piston ring, the positioning protrusion and the positioning groove are provided with a plurality of positioning protrusions and a plurality of positioning grooves, the plurality of positioning protrusions are one-to-one inserted into the plurality of positioning grooves, and the plurality of positioning protrusions are arranged along the circumferential direction of the connecting part.

[0010] As the preferred scheme of the piston ring, the positioning protrusion is provided with one, the positioning protrusion extends along the circumferential direction of the connecting portion, and the central angle of the circular arc formed by the positioning protrusion is greater than 270 degrees.

[0011] As the preferred scheme of the piston ring, the thermal conductivity of the heat insulation portion is less than the thermal conductivity of the connecting portion.

[0012] As the preferred scheme of the piston ring, along the axial direction of the piston, the projection of the ring body falls within the projection range of the heat insulation portion.

[0013] As the preferred scheme of the piston ring, the connecting portion is arranged on the inner wall of the ring body, and the inner wall of the connecting portion is close to the piston.

[0014] As the preferred scheme of the piston ring, the outer wall of the connecting portion is attached to the inner wall of the ring body.

[0015] According to another aspect of the utility model, provide cylinder, including above -mentioned piston ring, still include cylinder cover, cylinder body and set up in the piston of cylinder body, the piston ring is arranged on the outer wall of piston and can with piston synchronous movement, cylinder cover, cylinder body and piston jointly enclose combustion chamber.

[0016] As the preferred scheme of the cylinder, the piston ring is provided with a plurality of, wherein part of the piston ring is a gas ring, and another part of the piston ring is an oil ring.

[0017] According to still another aspect of the utility model, provide engine, including cylinder, still include oil atomizer, and the oil nozzle of oil atomizer is inhaled into the combustion chamber.

[0018] The utility model has the advantages of:

[0019] The utility model provides a piston ring, including ring body and protection ring, and the ring body is used for being set on the outer circumferential wall of the piston, the protection ring has heat insulation portion and connecting portion that are connected with each other, the heat insulation portion is arranged on one end of the ring body close to the combustion chamber, can play the role of heat insulation and absorbing the pressure impact of the combustion chamber, when knock occurs in the engine, can absorb high temperature and high frequency pressure fluctuation by the heat insulation portion, thereby playing the role of protecting the ring body, the connecting portion is arranged on the outer wall or the inner wall of the ring body, one of the ring body and the connecting portion is provided with a positioning protrusion, the other has a positioning groove, the positioning protrusion is inserted into the positioning groove, thereby limiting the axial direction of the piston, improving the stability of connection, when the piston ring moves along the axial direction of the piston synchronously with the piston, the ring body and the protection ring can be prevented from separating from each other.

[0020] The utility model also provides a cylinder, including above-mentioned piston ring, still include cylinder cover, cylinder body and set up in the piston in the cylinder body, the piston ring set up in the outer wall of piston and can with piston synchronous movement, cylinder cover, cylinder body and piston jointly enclose the combustion chamber, in the piston ring, through setting up heat insulation part absorbs high temperature and high frequency pressure fluctuation, thereby play the role of protecting ring body, in addition, positioning convex is inserted in the positioning groove, thereby makes two limit along the axial direction of piston, promotes the stability of connection, when the piston ring with piston synchronous movement along the axial direction of piston, can avoid ring body and protection ring separate from each other.

[0021] The utility model also provides an engine, including above-mentioned cylinder, still include fuel injector, the fuel injection nozzle of fuel injector is inhaled into the combustion chamber, to inject fuel oil to the combustion chamber, the working process of this engine, the piston of cylinder and piston ring synchronous reciprocating motion, through positioning convex is inserted in the positioning groove, can avoid ring body and protection ring of piston ring separate from each other. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structure schematic diagram of piston ring in the utility model embodiment;

[0023] Figure 2 It is the first structure schematic diagram of ring body in the utility model embodiment;

[0024] Figure 3 It is the structure schematic diagram of protection ring in the utility model embodiment;

[0025] Figure 4 It is the second structure schematic diagram of ring body in the utility model embodiment;

[0026] Figure 5 It is the third structure schematic diagram of ring body in the utility model embodiment.

[0027] In the drawing:

[0028] 1, ring body;11, positioning groove;12, opening;

[0029] 2, protection ring;21, heat insulation part;22, connecting portion;221, positioning convex. DETAILED DESCRIPTION

[0030] The utility model makes further detailed explanation in combination with the drawing and embodiment. It can be understood that the specific embodiment described here is only used to explain the utility model, and is not limited to the utility model. In addition, it needs to be explained that, in order to facilitate the description, only the part relevant to the utility model is shown in the drawing, not all structures.

[0031] In the description of the utility model, unless another definite provision and limitation, the term "link", "connection", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element's interaction relationship.For the ordinary skill in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0032] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional feature between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0033] In the description of the embodiment, the terms "on", "under", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0034] Knocking can cause high frequency and large amplitude fluctuation of in-cylinder pressure, and the temperature in the combustion chamber is abnormally high, in order to avoid the impact of knocking on the piston ring, the prior art provides a piston ring, the top surface of the piston ring is provided with a thermal suppression layer, the thermal suppression layer is arranged opposite to the combustion chamber, which can block the heat, so that the heat of the combustion chamber is difficult to enter the piston ring, thereby playing a role in protecting the piston ring.However, the problem is that the thermal suppression layer is arranged on the top surface of the piston ring, and the piston ring needs to reciprocate with the piston, and the thermal suppression layer and the piston ring only have one surface fit, which may cause the thermal suppression layer to fall off from the piston ring during the movement of the piston ring.

[0035] To this end, the embodiment provides a piston ring to solve the problem that the thermal suppression layer and the piston ring only have one surface fit, which may cause the thermal suppression layer to fall off from the piston ring during the movement of the piston ring, which can be used in the field of engine technology.

[0036] Reference Figures 1-5The piston ring comprises a ring body 1 and a protection ring 2, the ring body 1 is used to be sleeved on the outer circumferential wall of the piston. In the embodiment, the axis of the piston ring, the piston and the cylinder body coincide. In addition, the ring body 1 can be a gas ring or an oil ring, and has an opening 12. The protection ring 2 has a heat insulation part 21 and a connecting part 22 connected with each other. The heat insulation part 21 is arranged at one end of the ring body 1 close to the combustion chamber, and can play a role of heat insulation and absorbing the pressure impact of the combustion chamber. When the engine appears knock, the heat insulation part 21 can absorb high temperature and high frequency pressure fluctuation, thereby playing a role of protecting the ring body 1. The connecting part 22 is arranged on the outer wall or the inner wall of the ring body 1. One of the ring body 1 and the connecting part 22 is provided with a positioning protrusion 221, and the other has a positioning groove 11. The positioning protrusion 221 is inserted into the positioning groove 11, so that the two are limited in the axial direction of the piston, and the stability of the connection is improved. When the piston ring moves synchronously with the piston in the axial direction of the piston, the ring body 1 and the protection ring 2 can be prevented from separating from each other. In the embodiment, the positioning protrusion 221 is provided on the connecting part 22, and the positioning groove 11 is arranged on the ring body 1.

[0037] In the embodiment, the specific structure of the positioning protrusion 221 and the positioning groove 11 has the following two cases.

[0038] One of them is shown in Figure 4 The positioning protrusion 221 and the positioning groove 11 are both provided with a plurality of positioning protrusions 221 and a plurality of positioning grooves 11. The plurality of positioning protrusions 221 are one-to-one correspondingly inserted into the plurality of positioning grooves 11, and the plurality of positioning protrusions 221 are arranged in the circumferential direction of the connecting part 22, thereby improving the stability of the connection between the two. In this scheme, the positioning groove 11 should be arranged away from the opening 12 to avoid affecting the structural strength of the ring body 1 at the opening 12. Specifically, the central angle of the corresponding circular arc between the side wall of the positioning groove 11 close to the opening 12 and the side wall of the opening 12 is at least 5°.

[0039] Alternatively, any positioning protrusion 221 abuts against the groove wall of the corresponding positioning groove 11 in the circumferential direction of the piston ring, so as to prevent the positioning protrusion 221 from rotating relative to the positioning groove 11 in the circumferential direction of the piston ring, thereby avoiding displacement of the connecting part 22 relative to the ring body 1 in the circumferential direction of the piston ring.

[0040] The other is shown in Figure 5As shown, the positioning protrusion 221 is provided with one, the positioning protrusion 221 extends along the circumferential direction of the connecting portion 22, and the central angle of the circular arc formed by the positioning protrusion 221 is greater than 270°, which can be 280°, 290°, 300°, 310°, 320°, 320°, 340° or 350°, and in the embodiment, it is specifically 350°, so as to increase the central angle of the circular arc formed by the positioning protrusion 221 as much as possible, make the force of the positioning protrusion 221 uniform, and make the connection between the connecting portion 22 and the ring body 1 more stable. In addition, it can be understood that the central angle of the circular arc formed by the positioning protrusion 221 should not exceed 350°, so as to reserve a certain space for the setting of the opening 12, and ensure the structural strength near the opening 12.

[0041] Optionally, along the circumferential direction of the piston ring, the two end faces of the positioning protrusion 221 respectively abut against the two end groove walls of the positioning groove 11, which can also prevent the positioning protrusion 221 from rotating in the circumferential direction.

[0042] Continuing to refer to Figures 1-5 The thermal conductivity of the heat insulation portion 21 is less than that of the connecting portion 22. Since the heat insulation portion 21 is arranged opposite to the combustion chamber, it bears a large temperature, and therefore a material with a large thermal conductivity is used to make the heat insulation portion 21, so as to adapt to this feature.

[0043] Continuing to refer to Figures 1-5 Along the axial direction of the piston, the projection of the ring body 1 falls within the projection range of the heat insulation portion 21, so that along the axial direction of the piston, the ring body 1 is completely blocked by the heat insulation portion 21, so as to improve the heat insulation effect of the heat insulation portion 21, and further avoid the impact of high temperature and high frequency fluctuation pressure on the ring body 1.

[0044] Continuing to refer to Figures 1-5 Since the piston may vibrate or cause temperature rise under the influence of the combustion chamber when knocking occurs, in view of this phenomenon, in the embodiment, the connecting portion 22 is arranged on the inner wall of the ring body 1, so that the connecting portion 22 directly contacts the piston, can absorb vibration, and has a heat insulation effect, so as to protect the ring body 1. In addition, the inner wall of the connecting portion 22 is arranged close to the piston, so that the connecting portion 22 can move synchronously with the piston along the axial direction of the piston.

[0045] Continuing to refer to Figures 1-5 The outer wall of the connecting portion 22 is attached to the inner wall of the ring body 1, so as to prevent the connecting portion 22 from moving in the radial direction of the ring body 1. Optionally, the heat insulation portion 21 is attached to one end of the ring body 1 close to the combustion chamber, so as to avoid deformation of the heat insulation portion 21 relative to the ring body 1 during movement of the piston ring, which causes heat insulation failure.

[0046] In the embodiment, the positioning protrusion 221 is inserted into the positioning groove 11 to prevent the protective ring 2 from moving along the axial direction of the piston relative to the ring body 1, and the positioning protrusion 221 abuts against the groove wall of the corresponding positioning groove 11 to prevent the protective ring 2 from rotating along the circumferential direction of the piston relative to the ring body 1, and the outer wall of the connecting portion 22 abuts against the inner wall of the ring body 1 to prevent the protective ring 2 from deviating or deforming along the radial direction of the piston relative to the ring body 1, so that the ring body 1 and the protective ring 2 are tightly abutted and always move synchronously.

[0047] In the embodiment, the cross section of the positioning protrusion 221 is semicircular, semi-elliptical, triangular, rectangular or trapezoidal, and the positioning groove 11 is also provided with a corresponding shape, and the groove wall of the positioning groove 11 abuts against the outer wall of the positioning protrusion 221.

[0048] The embodiment also provides a cylinder, which comprises the piston ring and further comprises a cylinder cover, a cylinder body and a piston arranged in the cylinder body, the piston ring is arranged on the outer wall of the piston and can move synchronously with the piston, specifically, the outer wall of the piston is provided with a ring groove, and the piston ring is embedded in the ring groove. The cylinder cover, the cylinder body and the piston jointly enclose a combustion chamber, in the piston ring, the heat insulation portion 21 is arranged to absorb high temperature and high frequency pressure fluctuation, thereby playing a role of protecting the ring body 1, in addition, the positioning protrusion 221 is inserted into the positioning groove 11, so that the two are limited along the axial direction of the piston, the stability of connection is improved, and when the piston ring moves synchronously with the piston along the axial direction of the piston, the ring body 1 and the protective ring 2 can be prevented from separating from each other.

[0049] Optionally, a plurality of piston rings are arranged, and part of the piston rings are gas rings, and the other part of the piston rings are oil rings, so that stable sealing is formed between the two end chambers of the piston.

[0050] The embodiment also provides an engine, which comprises the cylinder and further comprises an oil injector, and the oil injection nozzle of the oil injector extends into the combustion chamber, so that fuel is injected into the combustion chamber, in the working process of the engine, the piston and the piston ring of the cylinder move synchronously, the positioning protrusion 221 is inserted into the positioning groove 11, so that the ring body 1 and the protective ring 2 of the piston ring can be prevented from separating from each other. The engine provided by the embodiment can be applied to vehicles, ships and other vehicles, and can also be applied to other mechanical equipment.

[0051] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A piston ring, characterized in that The piston ring comprises: a ring body (1) for being sleeved on the outer circumferential wall of a piston; a protective ring (2) having heat insulation portions (21) and connecting portions (22) connected to each other, the heat insulation portions (21) being arranged at one end of the ring body (1) close to a combustion chamber, the connecting portions (22) being arranged on the outer wall or the inner wall of the ring body (1), one of the ring body (1) and the connecting portions (22) being provided with positioning protrusions (221), and the other being provided with positioning grooves (11), the positioning protrusions (221) being inserted into the positioning grooves (11).

2. The piston ring of claim 1, wherein The positioning protrusions (221) and the positioning grooves (11) are provided in plurality, the positioning protrusions (221) are one-to-one correspondingly inserted into the positioning grooves (11), and the positioning protrusions (221) are arranged in interval along the circumferential direction of the connecting portions (22).

3. The piston ring of claim 1, wherein The positioning protrusions (221) are provided in one, the positioning protrusions (221) extend along the circumferential direction of the connecting portions (22), and the positioning protrusions (221) form an arc with a central angle greater than 270°.

4. The piston ring according to any one of claims 1 to 3, characterized in that The heat conductivity coefficient of the heat insulation portions (21) is less than that of the connecting portions (22).

5. The piston ring according to any one of claims 1 to 3, characterized in that In the axial direction of the piston, the projection of the ring body (1) falls within the projection range of the heat insulation portions (21).

6. The piston ring according to any one of claims 1 to 3, characterized in that The connecting portions (22) are arranged on the inner wall of the ring body (1), and the inner wall of the connecting portions (22) is close to the piston.

7. The piston ring of claim 6, wherein The outer wall of the connecting portions (22) is in contact with the inner wall of the ring body (1).

8. A cylinder characterized by The piston ring comprises the piston ring according to any one of claims 1-7, a cylinder head, a cylinder body and a piston arranged in the cylinder body, the piston ring being arranged on the outer wall of the piston and being capable of moving synchronously with the piston, and the cylinder head, the cylinder body and the piston jointly defining a combustion chamber.

9. The air cylinder of claim 8, wherein, The piston ring is provided in plurality, wherein part of the piston rings are air rings, and the other part of the piston rings are oil rings.

10. An engine characterised by The piston ring comprises the cylinder according to claim 8 or 9, and further comprises an oil injector, an oil injection nozzle of the oil injector extending into the combustion chamber.

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