A cylinder liner structure with stepped flanges

Abstract

The application provides a cylinder liner structure with stepped supporting edges, which comprises a cylinder liner body and a cylinder cover body matched with the cylinder liner body; one end of the cylinder liner body towards the cylinder cover body is provided with an upper supporting seat ring, and the other end is provided with a lower supporting seat ring; a flange is arranged on the cylinder liner body at a position corresponding to the upper position of the upper supporting seat ring; a supporting edge is arranged on the inner side of the flange, and the outer side of the flange is provided with a cylinder gasket matched with the supporting edge. The cylinder liner structure with stepped supporting edges fully considers the reliability, safety and mountability of the parts, the supporting edge structure on the cylinder liner can meet the strength requirement, is convenient for processing, and can ensure the structural strength of the combustion chamber of the cylinder cover and the matching gap between the cylinder cover and the cylinder liner, and the structural strength of the cylinder liner extending into the stepped hole is considered, which is beneficial to improving the reliability of the engine during operation.

Description

Technical Field

[0001] This invention belongs to the field of engine technology, and in particular relates to a cylinder liner structure with stepped support. Background Technology

[0002] Engine cylinder liners form the space for gas compression, combustion, and expansion, and guide the piston. They also transfer some of the heat from the cylinder to the cooling medium. The inner wall of a diesel engine's wet cylinder liner is directly subjected to the high temperature and pressure of the combustion gases, as well as the side pressure and high-speed relative motion of the piston. Therefore, the cylinder liner bears significant mechanical stress, thermal stress, and considerable friction. The outer wall of the cylinder liner is directly eroded by the cooling water. Therefore, cylinder liners need sufficient strength and rigidity, good wear resistance and corrosion resistance on the inner surface, and a certain degree of resistance to cooling water corrosion on the outer surface.

[0003] Cylinder liners need to be installed on the cylinder block or engine block. The cylinder liner flange presses against the support plane of the cylinder block (engine block) for axial positioning. The support ring on the outer surface of the cylinder liner fits tightly with the cylinder block for radial positioning. A sealing rubber ring is installed under the lower support ring to seal the coolant and engine oil. The support edge of the low-profile cylinder liner, which fits with the existing cylinder head, does not need to extend into the cylinder head combustion chamber, while the support edge of the high-profile cylinder liner does extend into the cylinder head combustion chamber. This extension reduces the erosion of the cylinder head gasket by high-temperature combustion gases. Therefore, replacing the existing low-profile cylinder liner with a high-profile cylinder liner can effectively improve the service life of the cylinder head gasket.

[0004] However, since the steel wire of the existing cylinder head is located close to the combustion chamber, in order to ensure the strength requirements of the combustion chamber, the cylinder head size cannot be directly improved to process stepped holes. Therefore, if the high-support cylinder liner is to be fitted with the existing cylinder head, the existing cylinder head and cylinder liner need to be redesigned to ensure the overall strength of the cylinder head and cylinder liner. Summary of the Invention

[0005] In view of this, the present invention aims to propose a cylinder liner structure with stepped support edge to solve the problem of the existing cylinder head and high support edge cylinder liner fitting together.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows: A cylinder liner structure with a stepped support edge includes a cylinder liner body and a cylinder head body that mates with the cylinder liner body. The cylinder liner body has an upper support ring at one end facing the cylinder head body and a lower support ring at the other end. A flange is provided on the cylinder liner body at a position corresponding to the upper support ring. A support edge is provided inside the flange, and a cylinder head gasket mates with the support edge on the outer side. One end of the cylinder head gasket abuts against the flange, and the other end abuts against the cylinder head body. A mounting hole for installing a steel wire is provided on the cylinder head body at a position corresponding to the outer side of the flange. One end of the support edge is disposed on the flange, and the other end extends into the cylinder head body. An inner ring groove for assembling the support edge is provided on the cylinder head body, and a recessed portion mates with the inner ring groove is provided on the support edge at a position corresponding to the upper part of the cylinder head gasket.

[0007] Furthermore, the cylinder head body has an arc-shaped surface that mates with the end of the support edge at the position corresponding to the inner ring groove.

[0008] Furthermore, there is a fitting clearance between one end of the support extending into the inner annular groove and the cylinder head body.

[0009] Furthermore, the recessed portion has an annular structure, and the recessed portion and the cylinder head body are in clearance fit.

[0010] Furthermore, the outer diameter of the recessed portion is φ154. mm.

[0011] Furthermore, the outer diameter of the support is φ155. mm, the diameter of the inner annular groove is φ155 mm. mm.

[0012] Compared with the prior art, the cylinder liner structure with stepped support described in this invention has the following advantages: The cylinder liner structure with stepped support described in this invention fully considers the reliability, safety, and installability of the parts. The support structure on the cylinder liner can meet the strength requirements, is easy to process, and at the same time can ensure the structural strength of the cylinder head combustion chamber and the fitting clearance between the cylinder head and the cylinder liner. It also takes into account the structural strength of the cylinder liner extending into the stepped hole, which is beneficial to improving the reliability of the engine during operation. Attached Figure Description

[0013] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of a cylinder liner structure with stepped support as described in an embodiment of the present invention; Figure 2This is a schematic diagram of the cylinder head body in a cylinder liner structure with stepped support as described in an embodiment of the present invention. Figure 3 This is a schematic diagram of the cylinder liner body in a cylinder liner structure with stepped support as described in an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure at the support edge in a cylinder liner structure with stepped support edge according to an embodiment of the present invention.

[0014] Explanation of reference numerals in the attached figures: 1. Cylinder head body; 2. Cylinder head gasket; 3. Cylinder liner body; 4. Flange; 5. Support edge; 6. Upper support ring; 7. Lower support ring; 8. Mounting hole; 9. Inner ring groove; 10. Arc-shaped part; 11. Recess. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0016] A cylinder liner structure with stepped support, such as Figures 1 to 4 As shown, the cylinder head body includes a cylinder liner body 3 and a cylinder head body 1 that mates with the cylinder liner body 3. The cylinder liner body 3 has an upper support ring 6 at one end facing the cylinder head body 1 and a lower support ring 7 at the other end. A flange 4 is located on the cylinder liner body 3 above the upper support ring 6. A support edge 5 is located on the inner side of the flange 4, and a cylinder gasket 2 that mates with the support edge 5 is located on the outer side. One end of the cylinder gasket 2 abuts against the flange 4, and the other end abuts against the cylinder head body 1. A mounting hole 8 for installing a steel wire is located on the cylinder head body 1 at the position corresponding to the outer side of the flange 4. The flange 4 is fixed to the cylinder liner body 3, and the cylinder gasket 2 can be fitted onto the support edge 5 and is limited by the flange 4.

[0017] Specifically, the lower surface of the combustion chamber of the cylinder head body 1 is generally equipped with two φ1 mm steel wires, so two corresponding mounting holes 8 can also be set. In actual use, by setting the mounting holes 8 of the steel wires to correspond to the flange 4, the sealing of the cylinder head gasket 2 to the combustion gas can be strengthened, which can effectively solve the cylinder head gasket 2 failure.

[0018] Because the design of the cylinder head and the matching cylinder liner must be considered holistically, and given that the inner diameter of the cylinder liner is fixed, the existing cylinder head, due to the limitations of the steel wire position, will compromise the structural strength of the cylinder liner if the wall thickness of the cylinder liner support edge 5 is too thin. Furthermore, since the cylinder liner is a thin-walled structure, the improved design must comprehensively consider the structural strength of the cylinder liner support edge 5 and the structural strength of the combustion chamber area of ​​the cylinder head. In addition, the design must ensure that the minimum wall thickness of the cylinder liner support edge 5 meets the strength requirements of the cylinder liner; those skilled in the art can design according to actual needs, and this will not be elaborated here.

[0019] Therefore, in practical applications, it is necessary to improve the structure of the flange 4. Specifically, a support edge 5 can be provided on the flange 4, wherein one end of the support edge 5 is fixed on the flange 4 and the other end extends into the cylinder head body 1. The cylinder head body 1 is provided with an inner ring groove 9 for assembling the support edge 5, and a recessed portion 11 corresponding to the position above the cylinder head gasket 2 is provided on the support edge 5 to cooperate with the inner ring groove 9.

[0020] Optionally, the cylinder head body 1 has an arc-shaped portion 10 corresponding to the inner ring groove 9, which mates with the end of the support edge 5. Specifically, there is a mating gap between the end of the support edge 5 that extends into the inner ring groove 9 (i.e., the recess 11) and the cylinder head body 1, and the inner wall of the inner ring groove 9 has an arc-shaped chamfer R at the bend to form the arc-shaped portion 10.

[0021] In practical applications, there is a fitting gap between the upper end face of the support edge 5 and the cylinder head body 1. By setting the arc-shaped surface 10, not only can damage to the support edge 5 be avoided during assembly, but it can also play a good limiting role for the support edge 5, so that a fitting gap is formed between the support edge 5 and the cylinder head body 1 to meet the requirements of vertical deformation at the support edge 5 and improve the structural reliability of the support edge 5 on the cylinder liner body 3.

[0022] Optionally, the recess 11 is an annular structure, and the recess 11 and the cylinder head body 1 are in clearance fit. Specifically, the recess 11 is provided on the outer side of the support edge 5. By adopting a clearance fit, it can not only meet the clearance fit requirements with the inner annular groove 9 of the cylinder head, but also meet the requirements for lateral deformation of the support edge 5, further improving the structural reliability of the support edge 5 on the cylinder liner body 3.

[0023] In practical applications, the outer diameter of the recess 11 is φ154. mm, the outer diameter of support 5 is φ155 mm. mm, the diameter of the inner annular groove 9 is φ155 mm. mm.

[0024] The specific design could be: a) Diameter of the recessed part 11 along the support 5 is φ154 The mm is designed to meet the structural strength requirements of the cylinder liner while taking into account the limitations of the cylinder head steel wire position. This ensures that the minimum wall thickness of the cylinder liner support edge is 5 mm, which meets the requirements of the design manual.

[0025] b) Support 5 dimension φ155 The size of the cylinder head gasket (mm) is designed to meet the requirements of universality.

[0026] c) The height of the support 5 step is 6±0.3 (i.e., the height of the recess 11). This is designed taking into account the distance the piston extends into the cylinder head combustion chamber during crankshaft operation and the compression of the cylinder head gasket 2.

[0027] d) The height of the support 5 is 8±0.2 and the height of the flange 4 is 8, which are designed taking into account the strength of the installation structure and the overall design requirements.

[0028] e) The diameter of the inner annular groove 9 is designed to be φ155. mm, which not only ensures the wall thickness from the combustion chamber to the wire hole, but also meets the clearance requirements with the cylinder liner extending into the flange 4.

[0029] f) The depth of the inner ring groove 9 is determined taking into account the trajectory of the connecting rod piston movement and system requirements.

[0030] The cylinder liner structure with stepped support described in this invention fully considers the reliability, safety, and installability of the parts. The support structure on the cylinder liner can meet the strength requirements, is easy to process, and at the same time can ensure the structural strength of the cylinder head combustion chamber and the fitting clearance between the cylinder head and the cylinder liner. It also takes into account the structural strength of the cylinder liner extending into the stepped hole, which is beneficial to improving the reliability of the engine during operation.

[0031] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A cylinder liner structure with stepped support, characterized in that: The cylinder head body includes a cylinder liner body (3) and a cylinder head body (1) that mates with the cylinder liner body (3). The cylinder liner body (3) has an upper support ring (6) at one end facing the cylinder head body (1) and a lower support ring (7) at the other end. A flange (4) is provided on the cylinder liner body (3) above the upper support ring (6). A support edge (5) is provided on the inner side of the flange (4), and a cylinder gasket (2) mates with the support edge (5) on the outer side. One end of the cylinder gasket (2) abuts against the flange (4), and the other end abuts against the cylinder head body (1). An installation hole (8) for installing a steel wire is provided on the cylinder head body (1) at the position corresponding to the outer side of the flange (4). The support (5) is provided at one end on the flange (4) and at the other end in the cylinder head body (1). The cylinder head body (1) is provided with an inner ring groove (9) for mounting the support (5). The support (5) is provided with a recess (11) that mates with the inner ring groove (9) at a position above the cylinder head gasket (2). The cylinder head body (1) is provided with an arc-shaped surface (10) that mates with the end of the support (5) at a position corresponding to the inner ring groove (9). There is a fitting gap between the end of the support (5) that extends into the inner ring groove (9) and the cylinder head body (1). The recess (11) is an annular structure and there is a clearance fit between the recess (11) and the cylinder head body (1).

2. The cylinder liner structure with stepped support according to claim 1, characterized in that: The outer diameter of the recess (11) is φ154. mm.

3. A cylinder liner structure with stepped support according to claim 2, characterized in that: The outer diameter of the support (5) is φ155. mm, the diameter of the inner annular groove (9) is φ155 mm. mm.

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