Diesel engine air cylinder structure and carbon scraping ring for piston of diesel engine air cylinder structure

Abstract

The utility model relates to the technical field of diesel engines, and discloses a diesel engine air cylinder structure and a carbon scraping ring for a piston thereof, the carbon scraping ring for the piston is sleeved on the upper portion of an air cylinder sleeve, and the inner diameter of the carbon scraping ring is gradually reduced from bottom to top so that the inner diameter of the upper portion of the carbon scraping ring is larger than the outer diameter of an air valve movement envelope circle, and collision between the carbon scraping ring and an air valve is avoided. The inner diameter of the upper portion of the carbon scraping ring is larger than the outer diameter of an air valve movement enveloping circle, the carbon scraping ring is effectively prevented from colliding with the air valve, meanwhile, due to the fact that the carbon scraping ring does not have the risk of colliding with the air valve, a locating pin does not need to be additionally arranged to limit rotation of the carbon scraping ring, a pin hole structure of a traditional carbon scraping ring is omitted, and the strength and reliability of the carbon scraping ring are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to diesel engine technical field more specifically, relate to a carbon ring for piston. BACKGROUND

[0002] The upper portion of the cylinder liner of the diesel engine is usually provided with a carbon ring, which is used to scrape off the carbon deposit on the side of the top of the piston, so as to reduce the wear of the cylinder liner, and prevent the lubricating oil from rising to the combustion chamber, thereby reducing the gas leakage and the consumption of lubricating oil.

[0003] The existing carbon ring structure, please refer to Figure 1 And Figure 2 The carbon ring 1 is sleeved on the upper portion of the cylinder liner 2, in order to avoid the collision between the carbon ring 1 and the valve 3, not only the upper portion of the carbon ring 1 is provided with a valve-avoiding gap, but also a positioning pin 6 is arranged to limit the rotation of the carbon ring 1, one end of the positioning pin 6 is connected with the carbon ring 1, and the other end is clamped in the limiting groove in the cylinder liner 2.

[0004] The above-mentioned carbon ring structure not only has the problem of reducing the structural strength of the carbon ring 1 due to the pin hole of the carbon ring 1, but also has the problem of wear of the positioning pin 6 after long-term use, so that the carbon ring 1 still has the risk of rotating and colliding with the valve 3, once the carbon ring 1 is damaged, the fragments of the carbon ring 1 will damage the piston 4 and the cylinder head 2, and will enter the supercharger with the exhaust gas to damage the supercharger, resulting in a major failure and loss.

[0005] Therefore, how to avoid the collision risk between the carbon ring and the valve is a problem to be solved by the technical personnel in the field. CONTENT OF THE UTILITY MODEL

[0006] Therefore, the utility model aims at providing a carbon ring for piston, the inner diameter of the upper portion of the carbon ring is greater than the outer diameter of the motion envelope circle of the valve, which effectively avoids the collision between the carbon ring and the valve, and eliminates the pin hole structure of the traditional carbon ring, thereby improving the strength and reliability of the carbon ring.

[0007] In addition, the utility model further provides a diesel engine cylinder structure comprising the above-mentioned carbon ring for piston.

[0008] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0009] A carbon ring for piston, which is sleeved on the upper portion of the cylinder liner, the inner diameter of the carbon ring gradually decreases from bottom to top, so that the inner diameter of the upper portion of the carbon ring is greater than the outer diameter of the motion envelope circle of the valve, thereby avoiding the collision between the carbon ring and the valve.

[0010] Preferably, the inner circumferential surface of the carbon scraping ring is sequentially provided with a first cylindrical surface, a connecting surface and a second cylindrical surface from top to bottom, the upper end of the connecting surface is connected with the first cylindrical surface, and the lower end of the connecting surface is connected with the second cylindrical surface.

[0011] Preferably, a first transition round corner is arranged between the first cylindrical surface and the connecting surface, and a second transition round corner is arranged between the connecting surface and the second cylindrical surface.

[0012] Preferably, the radial distance between the first cylindrical surface and the outer circumferential surface of the gas valve is 2-3 mm.

[0013] Preferably, the lower end of the first cylindrical surface is lower than the bottom surface of the gas valve, and the axial distance between the lower end of the first cylindrical surface and the bottom surface of the gas valve is 2-3 mm.

[0014] Preferably, the connecting surface comprises a horizontal connecting surface, and the horizontal connecting surface is arranged perpendicularly to the axis of the carbon scraping ring.

[0015] Preferably, the connecting surface comprises a circular truncated cone surface, and the axis of the circular truncated cone surface is collinear with the axis of the carbon scraping ring.

[0016] Preferably, the upper end of the second cylindrical surface is lower than the top surface of the piston, and the axial distance between the lower end of the second cylindrical surface and the piston is less than or equal to the maximum allowable carbon thickness of the side surface of the top of the piston.

[0017] Preferably, the carbon scraping ring is sleeved in the stepped hole of the cylinder liner, the outer circumferential surface of the carbon scraping ring is used for abutting against the inner circumferential surface of the stepped hole, and the bottom surface of the carbon scraping ring is used for abutting against the stepped surface of the stepped hole.

[0018] A diesel engine cylinder structure comprises a cylinder liner, a gas valve and a piston, the gas valve and the piston are installed in the stepped hole of the cylinder liner from top to bottom, and the upper portion of the cylinder liner is sleeved with the carbon scraping ring for the piston.

[0019] The inner diameter of the upper portion of the carbon scraping ring for the piston is greater than the outer diameter of the motion envelope circle of the gas valve, so that the collision between the carbon scraping ring and the gas valve is effectively avoided, the carbon scraping ring does not have the risk of collision with the gas valve, the positioning pin for limiting the rotation of the carbon scraping ring is not additionally arranged, the pin hole structure of the carbon scraping ring is omitted, and the strength and reliability of the carbon scraping ring are improved.

[0020] In addition, the utility model also provides a diesel engine cylinder structure comprising the carbon scraping ring for the piston, avoids the collision risk between the carbon scraping ring and the gas valve, omits the limiting groove structure of the cylinder liner, and improves the strength and reliability of the cylinder liner. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute a part of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0022] Figure 1 It is a structural schematic diagram of the carbon scraping ring in the prior art.

[0023] Figure 2 It is a half-section schematic diagram of the diesel engine cylinder structure in the prior art.

[0024] Figure 3 It is a structural schematic diagram of the carbon scraping ring for the piston provided by the present application.

[0025] Figure 4 It is a half-section schematic diagram of the diesel engine cylinder structure provided by the present application.

[0026] Figures 1-4 In the present application,

[0027] 1 - carbon scraping ring, 11 - first cylindrical surface; 12 - connecting surface; 13 - second cylindrical surface; 2 - cylinder sleeve; 3 - gas valve; 4 - piston; 5 - piston ring; 6 - positioning pin. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments only constitute a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] The core of the present application is to provide a carbon scraping ring for a piston. The inner diameter of the upper part of the carbon scraping ring is greater than the outer diameter of the motion envelope circle of the gas valve, which effectively avoids the collision between the carbon scraping ring and the gas valve, and eliminates the pin hole structure of the traditional carbon scraping ring, thereby improving the strength and reliability of the carbon scraping ring.

[0030] In addition, the present application also provides a diesel engine cylinder structure comprising the above-mentioned carbon scraping ring for a piston.

[0031] The carbon scraping ring for a piston provided by the present application is sleeved on the upper part of the cylinder sleeve 2. The inner diameter of the carbon scraping ring 1 gradually decreases from bottom to top, so that the inner diameter of the upper part of the carbon scraping ring 1 is greater than the outer diameter of the motion envelope circle of the gas valve 3, thereby avoiding the collision between the carbon scraping ring 1 and the gas valve 3.

[0032] Please refer to Figure 4The carbon scraping ring 1 is arranged in the stepped hole of the upper portion of the cylinder sleeve 2, the inner circumferential surface of the upper portion of the carbon scraping ring 1 is arranged opposite to the valve 3, and the inner circumferential surface of the lower portion of the carbon scraping ring 1 is arranged opposite to the piston 4, so that the carbon scraping ring 1 scrapes the carbon deposited on the side of the top portion of the piston 4;

[0033] The inner diameter of the upper portion of the carbon scraping ring 1 is greater than the outer diameter of the motion envelope circle of the valve 3, and gaps are arranged between the inner circumferential surface of the upper portion of the carbon scraping ring 1 and the motion envelope circle of the valve 3 in all directions, so that the carbon scraping ring 1 does not collide with the valve 3 in any direction, and the collision risk of the carbon scraping ring 1 and the valve 3 is effectively avoided.

[0034] Since the carbon scraping ring 1 does not collide with the valve 3 in any direction, the orientation of the carbon scraping ring 1 does not need to be limited by the limiting groove of the cylinder sleeve 2 through the positioning pin 6, so that the pin hole structure of the carbon scraping ring 1 and the limiting groove structure of the cylinder sleeve 2 can be cancelled, which simplifies the structures of the carbon scraping ring 1 and the cylinder sleeve 2, facilitates the machining of the carbon scraping ring 1 and the cylinder sleeve 2, improves the structural strength of the carbon scraping ring 1 and the cylinder sleeve 2, and is beneficial to improving the service life and reliability of the carbon scraping ring 1 and the cylinder sleeve 2.

[0035] The material of the carbon scraping ring 1 is determined according to the actual production needs and the existing carbon scraping ring 1, so as to ensure the strength of the carbon scraping ring 1 and the scraping effect of the carbon scraping ring 1 on the carbon deposition;

[0036] Meanwhile, the inner diameter of the lower portion of the carbon scraping ring 1 can also be determined according to the actual production needs and the existing carbon scraping ring 1, so that the carbon scraping ring 1 can effectively scrape the carbon deposited on the side of the top portion of the piston 4, and the inner diameter of the upper portion of the carbon scraping ring 1 needs to be determined according to the structure and size of the valve 3 in the actual production, so as to ensure that the carbon scraping ring 1 does not collide with the valve 3 in all directions.

[0037] In the embodiment, the inner diameter of the upper portion of the carbon scraping ring 1 is greater than the outer diameter of the motion envelope circle of the valve 3, which effectively avoids the collision between the carbon scraping ring 1 and the valve 3, and since the carbon scraping ring 1 does not have the risk of collision with the valve 3, the positioning pin 6 for limiting the rotation of the carbon scraping ring 1 is not needed, and the pin hole structure of the carbon scraping ring 1 is omitted, thereby improving the strength and reliability of the carbon scraping ring 1.

[0038] On the basis of the above embodiment, please refer to Figure 3 The inner circumferential surface of the carbon scraping ring 1 can be sequentially provided with a first cylindrical surface 11, a connecting surface 12 and a second cylindrical surface 13 from top to bottom, the upper end of the connecting surface 12 is connected with the first cylindrical surface 11, and the lower end of the connecting surface 12 is connected with the second cylindrical surface 13.

[0039] The first cylindrical surface 11 and the connecting surface 12 are arranged at the middle upper part of the carbon scraping ring 1, and the shape and size thereof are determined according to the shape and size of the outer peripheral part of the air valve 3, so that the carbon scraping ring 1 does not collide with the air valve 3. Generally, a safety distance of 2-3 mm is provided between the carbon scraping ring 1 and the air valve 3.

[0040] In consideration of the fact that the inner diameter of the connecting surface 12 is larger than that of the first cylindrical surface 11, in order to further reduce the risk of collision between the carbon scraping ring 1 and the air valve 3, the lower end of the first cylindrical surface 11 is preferably lower than the bottom surface of the air valve 3, and the axial distance between the lower end of the first cylindrical surface 11 and the bottom surface of the air valve 3 is 2-3 mm, so that the connecting surface 12 does not collide with the air valve 3.

[0041] The radial distance between the first cylindrical surface 11 and the outer peripheral surface of the air valve 3 can also be 2-3 mm.

[0042] The connecting surface 12 can be arranged as a horizontal connecting surface which is perpendicular to the axis of the carbon scraping ring 1, that is, the connecting surface 12 is processed as a stepped surface, which is simple in structure and relatively simple to process.

[0043] However, in order to reduce the risk of collision between the connecting surface 12 and the air valve 3, the connecting surface 12 is preferably arranged as Figure 3 a circular truncated cone surface, and the axis of the circular truncated cone surface is collinear with the axis of the carbon scraping ring 1, which is also conducive to reducing the stress concentration problem at the connecting part between the connecting surface 12 and the first and second cylindrical surfaces.

[0044] The second cylindrical surface 13 is arranged at the lower part of the carbon scraping ring 1, and is used for scraping the carbon deposit on the top side of the piston 4. In order to facilitate the scraping of the carbon deposit by the second cylindrical surface 13, the upper end of the second cylindrical surface 13 is generally lower than the top surface of the piston 4, and the axial distance between the lower end of the second cylindrical surface 13 and the piston 4 is less than or equal to the maximum allowable carbon deposit thickness on the top side of the piston 4.

[0045] In the embodiment, the two ends of the inner peripheral surface of the carbon scraping ring 1 are respectively provided with the first cylindrical surface 11 and the second cylindrical surface 13, which not only have regular shapes and are convenient to process, but also are conducive to the assembly and disassembly of the carbon scraping ring 1.

[0046] Preferably, a first transition round corner is arranged between the first cylindrical surface 11 and the connecting surface 12, and a second transition round corner is arranged between the connecting surface 12 and the second cylindrical surface 13, so that the inner peripheral surface of the carbon scraping ring 1 is smoothly connected at the two transition round corners, so as to reduce the stress concentration phenomenon at the connecting part, reduce the thermal stress at the connecting part in a high-temperature working environment, and further prolong the service life of the carbon scraping ring 1.

[0047] The specific sizes of the first transition round corner and the second transition round corner are determined according to the inner diameters of the first cylindrical surface 11, the connecting surface 12 and the second cylindrical surface 13 in actual production, as long as the connecting part is smoothly connected.

[0048] On the basis of the above-mentioned embodiments, the installation mode of the carbon scraping ring 1 is limited, please refer to Figure 4 The carbon scraping ring 1 is sleeved in the stepped hole of the cylinder sleeve 2, the outer circumferential surface of the carbon scraping ring 1 is used for abutting with the inner circumferential surface of the stepped hole, and the bottom surface of the carbon scraping ring 1 is used for abutting with the stepped surface of the stepped hole.

[0049] The height of the carbon scraping ring 1 is determined according to the height of the small-diameter end of the stepped hole of the cylinder sleeve 2 in actual production, and the width of the bottom surface of the carbon scraping ring 1 is determined according to the width of the stepped surface of the stepped hole of the cylinder sleeve 2 in actual production, so that the carbon scraping ring 1 partially protrudes out of the stepped surface of the stepped hole, and the carbon scraping ring 1 is convenient for scraping the carbon deposited on the side surface of the top of the piston 4.

[0050] In addition to the above-mentioned carbon scraping ring for piston, the utility model also provides a diesel engine cylinder structure comprising the carbon scraping ring for piston disclosed in the above-mentioned embodiments, the diesel engine cylinder structure comprises a cylinder sleeve 2, a gas valve 3 and a piston 4, the gas valve 3 and the piston 4 are installed in the stepped hole of the cylinder sleeve 2 from top to bottom, and a piston ring 5 is arranged between the piston 4 and the cylinder sleeve 2, the upper portion of the cylinder sleeve 2 is provided with the carbon scraping ring for piston disclosed in the above-mentioned embodiments, and the structures of other parts of the diesel engine cylinder structure please refer to the prior art, and the text will not be repeated here.

[0051] It should be noted that the first and second in the first cylindrical surface 11 and the second cylindrical surface 13 and the first and second in the first transition round corner and the second transition round corner in the application file are only used to distinguish the difference in position, and do not contain the limitation of order.

[0052] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0053] The diesel engine cylinder structure and the carbon scraping ring for piston provided by the utility model are introduced in detail. The principle and implementation mode of the utility model are described by applying specific examples in the text, and the description of the above embodiments is only used to help understand the method and core idea of the utility model. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the utility model without departing from the principle of the utility model, and these improvements and modifications also fall within the protection scope of the utility model claims.

Claims

1. A carbon scraping ring for a piston, which is fitted to an upper portion of a cylinder liner (2), characterized in that, The inner diameter of the carbon scraping ring (1) gradually decreases from bottom to top, so that the inner diameter of the upper part of the carbon scraping ring (1) is greater than the outer diameter of the movement envelope circle of the gas valve (3), avoiding collision between the carbon scraping ring (1) and the gas valve (3); The inner circumferential surface of the carbon scraping ring (1) is sequentially provided with a first cylindrical surface (11), a connecting surface (12) and a second cylindrical surface (13) from top to bottom, the upper end of the connecting surface (12) is connected with the first cylindrical surface (11), and the lower end of the connecting surface (12) is connected with the second cylindrical surface (13); The first transition round corner is arranged between the first cylindrical surface (11) and the connecting surface (12), and the second transition round corner is arranged between the connecting surface (12) and the second cylindrical surface (13).

2. The carbon scraping ring for a piston according to claim 1, characterized by The radial distance between the first cylindrical surface (11) and the outer circumferential surface of the gas valve (3) is 2-3mm.

3. The carbon scraping ring for a piston according to claim 1, characterized by The lower end of the first cylindrical surface (11) is lower than the bottom surface of the gas valve (3), and the axial distance between the lower end of the first cylindrical surface (11) and the bottom surface of the gas valve (3) is 2-3mm.

4. The carbon scraping ring for a piston according to claim 3, characterized by The connecting surface (12) includes a horizontal connecting surface, and the horizontal connecting surface is perpendicular to the axis of the carbon scraping ring (1).

5. The carbon scraping ring for a piston according to claim 3, characterized by The connecting surface (12) includes a circular truncated cone surface, and the axis of the circular truncated cone surface is collinear with the axis of the carbon scraping ring (1).

6. The carbon scraping ring for a piston according to claim 1, characterized by The upper end of the second cylindrical surface (13) is lower than the top surface of the piston (4), and the axial distance between the lower end of the second cylindrical surface (13) and the piston (4) is less than or equal to the maximum allowable carbon thickness of the side surface of the top of the piston (4).

7. The carbon scraping ring for a piston according to any one of claims 1 to 6, characterized in that The carbon scraping ring (1) is sleeved in the stepped hole of the cylinder liner (2), the outer circumferential surface of the carbon scraping ring (1) is used for abutting against the inner circumferential surface of the stepped hole, and the bottom surface of the carbon scraping ring (1) is used for abutting against the stepped surface of the stepped hole.

8. A diesel engine cylinder structure characterized by comprising: The carbon scraping ring (1) is sleeved in the stepped hole of the cylinder liner (2), the outer circumferential surface of the carbon scraping ring (1) is used for abutting against the inner circumferential surface of the stepped hole, and the bottom surface of the carbon scraping ring (1) is used for abutting against the stepped surface of the stepped hole. The carbon scraping ring (1) is sleeved in the stepped hole of the cylinder liner (2), the outer circumferential surface of the carbon scraping ring (1) is used for abutting against the inner circumferential surface of the stepped hole, and the bottom surface of the carbon scraping ring (1) is used for abutting against the stepped surface of the stepped hole.

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