Cylinder sleeve and engine
By setting a non-linear end surface in the inner bore of the cylinder liner, friction loss is reduced and oil film pressure is enhanced, the problems of piston wear and knocking on the cylinder are solved, and the performance stability of the engine is improved.
Patent Information
- Application Number
- CN202420097528.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-13
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-01-13
AI Technical Summary
Existing cylinder liners are prone to wear and knocking during the reciprocating movement of the piston, resulting in reduced performance.
A cylinder liner is designed, and the inner hole is provided with a first linear segment end face, a convex linear segment end face, a second linear segment end face that is connected in sequence along the axial direction. By designing these non-linear end faces, friction is reduced. Loss, enhance oil film pressure, reduce piston cylinder clearance, and reduce friction.
It effectively reduces friction and wear between the piston and the cylinder liner, reduces the risk of piston knocking on the cylinder, and improves the movement stability of the piston.
Smart Images
Figure CN222184942U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engines, in particular to a cylinder sleeve and an engine. Background Art
[0002] The inner hole of the existing cylinder liner is generally a straight cylindrical structure. When the piston reciprocates in the cylinder liner, wear usually occurs between the piston and the inner hole of the cylinder liner. In particular, the cylinder liner of a high-explosion compression engine is prone to piston knocking during the reciprocating motion of the piston, thereby reducing the performance of the cylinder liner. Utility Model Content
[0003] The utility model provides a cylinder sleeve and an engine, which can solve the problems of piston knocking and piston wear.
[0004] In a first aspect, the utility model provides a cylinder liner, which is applied to an engine, wherein the cylinder liner comprises a cylinder liner body, which is used to house a piston, and the piston can reciprocate relative to the cylinder liner body along the axial direction of the cylinder liner body, and the inner hole of the cylinder liner body is provided with a first straight line segment end face, a convex line segment end face, a concave line segment end face and a second straight line segment end face which are sequentially connected and arranged along the circumferential direction of the inner hole of the cylinder liner body along the axial direction of the cylinder liner body;
[0005] The end surface of the first straight line segment is close to the top of the cylinder liner body, the end surface of the second straight line segment is close to the bottom of the cylinder liner body, and both the end surface of the first straight line segment and the end surface of the second straight line segment are parallel to the central axis of the cylinder liner body;
[0006] The convex line segment end face is protruded toward the central axis of the cylinder liner body relative to the first straight line segment end face, and the concave line segment end face is concave relative to the first straight line segment end face away from the central axis of the cylinder liner body, and the linear contours of the convex line segment end face and the concave line segment end face are both curves.
[0007] The cylinder sleeve provided by the utility model is provided with a first straight segment end face, a convex segment end face, a concave segment end face and a second straight segment end face in the axial direction of the inner hole of the cylinder sleeve body, and the first straight segment end face and the second straight segment end face are respectively provided near the top and bottom ends of the cylinder sleeve body. When the piston reciprocates axially in the cylinder sleeve body, the speed of the piston at the first straight segment end face and the second straight segment end face is small, the friction loss is low, and the wear is also small. When the piston moves to the convex segment end face, the convex segment end face can enhance the wedge effect of the piston ring group, thereby forming a stronger oil film pressure and reducing friction and wear. In addition, the convex segment end face can also reduce the piston cylinder clearance, which is beneficial to the movement stability of the piston, thereby reducing the risk of piston knocking. When the piston moves to the concave segment end face, the concave segment end face can increase the amount of lubricating oil, reduce the friction between the piston ring group and the piston skirt, and increase the piston cylinder clearance, which is beneficial to reduce the friction of the piston skirt. Therefore, the cylinder sleeve provided by the utility model can not only reduce the friction and wear between the piston and the cylinder sleeve, but also reduce the risk of piston knocking.
[0008] In some possible implementation schemes, the end of the first straight line segment end face away from the convex line segment end face is the top of the cylinder liner body, the axial dimension L0 of the first straight line segment end face along the cylinder liner body is equal to the axial dimension of the fire shore of the piston along the cylinder liner body, and the inner diameter of the first straight line segment end face is equal to the designed inner diameter of the cylinder liner body.
[0009] In some possible implementation schemes, the dimension L1 of the convex line segment end surface along the axial direction of the cylinder liner body is L1=2×c×R, wherein c is an empirical coefficient and R is a crank radius of the engine.
[0010] In some possible implementation schemes, the linear profile of the end face of the convex line segment satisfies the parabolic characteristic, and the diameter of the discrete points at each location of the end face of the convex line segment is D1=D-ax 2 -b, wherein D is the inner diameter of the end face of the first straight line segment, the coordinate range of x is -0.5L1 to 0.5L1, and b is the protrusion of the vertex of the parabola relative to the first straight line segment.
[0011] In some possible implementation schemes, the value of b ranges from 3 μm to 8 μm.
[0012] In some possible implementation schemes, the dimension L2 of the concave line segment end surface along the axial direction of the cylinder liner body is L2=2×k×R, wherein k is an empirical coefficient and R is a crank radius of the engine.
[0013] In some possible implementation schemes, the linear profile of the concave line segment end surface satisfies the parabolic characteristic, and the diameter of the discrete points at each location of the concave line segment end surface is D2=D-a0x2 -b0, wherein the coordinate range of x is -0.5L2 to 0.5L2, and b0 is the depression of the vertex of the parabola relative to the end surface of the first straight line segment.
[0014] In some possible implementation schemes, the value range of b0 is 2 μm to 5 μm.
[0015] In some possible implementation schemes, the end of the second straight line segment end face away from the concave line segment is the bottom end of the cylinder liner body, and the axial dimension of the second straight line segment end face along the cylinder liner is L3=L-L0-L1-L2, wherein L is the axial dimension between the top and bottom ends of the cylinder liner body.
[0016] In a second aspect, the utility model provides an engine, comprising a cylinder liner as described in any possible implementation scheme of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of a cylinder sleeve in an embodiment of the utility model.
[0018] In the figure:
[0019] 10-cylinder sleeve body; 20-first straight line segment end face; 30-convex line segment end face; 40-concave line segment end face; 50-second straight line segment end face. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0021] refer to Figure 1 The cylinder liner in the embodiment of the utility model can be applied to an engine. The cylinder liner includes a cylinder liner body 10. The cylinder liner body 10 is used to house a piston (not shown in the figure), and the piston can realize reciprocating motion in the cylinder liner inner body along the axial direction of the cylinder liner. The inner hole of the cylinder liner body 10 is provided with a first straight line segment end face 20, a convex line segment end face 30, a concave line segment end face 40 and a second straight line segment end face 50 connected in sequence along the axial direction of the cylinder liner body 10. The first straight line segment end face 20, the convex line segment end face 30, the concave line segment end face 40 and the second straight line segment end face 50 are all arranged around the inner hole of the cylinder liner body 10 in the circumferential direction.
[0022] Specifically, the first straight segment end surface 20 is close to the top of the cylinder liner body 10, and the end thereof away from the convex segment end surface 30 is the top of the cylinder liner body 10. The second straight segment end surface 50 is close to the bottom of the cylinder liner body 10, and the end thereof away from the concave segment end surface 40 is the bottom of the cylinder liner body 10. Moreover, the inner diameters of the first straight segment end surface 20 and the second straight segment end surface 50 are both the designed inner diameter D of the cylinder liner body 10, that is, along the radial direction of the cylinder liner body 10, the first straight segment end surface 20 and the second straight segment end surface 50 are located in the same plane.
[0023] The convex line segment end face 30 is protruded toward the central axis of the cylinder liner body 10 relative to the first straight line segment end face 20, and the concave line segment end face 40 is concave relative to the first straight line segment end face 20 away from the central axis of the cylinder liner body 10, and the linear contours of the convex line segment end face 30 and the concave line segment end face 40 are both curves.
[0024] In this embodiment, since the first straight segment end surface 20 is close to the top of the cylinder liner body 10, and the dimension L0 of the first straight segment end surface 20 along the axial direction of the cylinder liner body 10 is the circumferential dimension of the piston land along the cylinder liner body 10. When the piston moves at this location, the speed of the piston is low, the friction loss of the engine at this location is low, and the wear between the piston and the inner hole of the cylinder liner body 10 is also small, so the end surface at this location can be designed as a straight segment.
[0025] When the piston moves to the part of the cylinder liner body 10 corresponding to the convex line segment end face 30, this part is a high-risk area for piston knocking, piston ring group and cylinder liner wear. At this time, the end face at this part is designed as a convex line segment, which can enhance the wedge effect of the piston ring group (especially the flat-edged oil ring and the trapezoidal gas ring) when the piston assembly moves up and down, thereby forming a stronger oil film pressure, increasing the gap between the piston ring group and the cylinder liner body 10, and then reducing friction and wear. At the same time, due to the convex line segment end face 30 at this part, the gap between the piston skirt and the cylinder liner body 10 is reduced, which is beneficial to the movement stability of the piston, thereby reducing the risk of piston knocking.
[0026] The dimension L1 of the convex line segment end surface 30 along the axial direction of the cylinder liner body 10 is L1=2×c×R, wherein c is an empirical coefficient, generally taking a value of 1 / 3, and R is the crank radius of the engine.
[0027] In addition, the linear profile of the convex line segment end surface 30 in this embodiment satisfies the parabola characteristic, and the discrete point diameter D1 at each location of the convex line segment end surface 30 satisfies D1=D-ax 2-b, wherein the coordinate range of x is -0.5L1 to 0.5L1, and b is the protrusion of the vertex of the parabola relative to the end surface of the first straight line segment 20. As an optional embodiment, the value range of b can be 3 μm to 8 μm.
[0028] When the piston moves to the part of the cylinder liner body 10 corresponding to the concave line segment end face 40, the axial movement speed of the piston in this part is relatively high, which is a key area for reducing friction loss. In order to enhance the lubrication of this part, this part is designed as a concave line, which can increase the amount of lubricating oil in this part, thereby reducing the friction between the piston ring group and the piston skirt. At the same time, the design of the concave line segment end face 40 increases the gap between the piston skirt and the cylinder liner body 10, which is conducive to further reducing the friction of the piston skirt.
[0029] The dimension L2 of the concave line segment end surface 40 along the axial direction of the cylinder liner body 10 is L2=2×k×R, wherein k is an empirical coefficient, generally taking a value of 1 / 3 to 2 / 5, and R is the crank radius of the engine.
[0030] Furthermore, the linear profile of the concave line segment end surface 40 in this embodiment also satisfies the parabolic characteristic, and the discrete point diameter D2 at each location of the concave line segment end surface 40 satisfies D2=D-a0x 2 -b0, wherein the coordinate range of x is -0.5L2 to 0.5L2, and b0 is the amount of depression of the vertex of the parabola relative to the end surface 20 of the first straight line segment. As an optional embodiment, the value range of b0 can be 2μm to 5μm. It should be understood that when b0 is too large, it will lead to an increase in friction force, which is not conducive to reducing friction loss.
[0031] When the piston moves to the part of the cylinder liner body 10 corresponding to the second straight segment end surface 50, the speed of the piston in this part is low, the friction loss of the engine in this part is low, and the wear is also small. The axial dimension L3 of the second straight segment end surface 50 along the cylinder liner body 10 is L-L0-L1-L2, where L is the axial dimension between the top and bottom ends of the cylinder liner body 10.
[0032] Based on the same inventive concept, an embodiment of the utility model can also provide an engine, including the cylinder liner introduced in the above embodiment.
[0033] It can be understood that the cylinder liner and engine in the utility model not only improve the friction and wear performance of the piston assembly-cylinder liner system, but also suppress piston knocking and improve operating stability without adding other processing equipment or processes, or without changing other components (such as pistons).
[0034] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. A cylinder liner, applied to an engine, characterized in that: The cylinder liner includes a cylinder liner body for housing a piston, and the piston can reciprocate relative to the cylinder liner body along the axial direction of the cylinder liner body, and the inner hole of the cylinder liner body is provided with a first straight line segment end face, a convex line segment end face, a concave line segment end face and a second straight line segment end face which are sequentially connected and arranged along the circumferential direction of the inner hole of the cylinder liner body along the axial direction of the cylinder liner body; The end surface of the first straight line segment is close to the top of the cylinder liner body, the end surface of the second straight line segment is close to the bottom of the cylinder liner body, and both the end surface of the first straight line segment and the end surface of the second straight line segment are parallel to the central axis of the cylinder liner body; The convex line segment end face is protruded toward the central axis of the cylinder liner body relative to the first straight line segment end face, and the concave line segment end face is concave relative to the first straight line segment end face away from the central axis of the cylinder liner body, and the linear contours of the convex line segment end face and the concave line segment end face are both curves.
2. The cylinder liner according to claim 1, characterized in that: The end of the first straight line segment end face away from the convex line segment end face is the top end of the cylinder liner body, the axial dimension L0 of the first straight line segment end face along the cylinder liner body is equal to the axial dimension of the fire shore of the piston along the cylinder liner body, and the inner diameter of the first straight line segment end face is equal to the designed inner diameter of the cylinder liner body.
3. The cylinder liner according to claim 2, characterized in that: The dimension L1 of the convex line segment end surface along the axial direction of the cylinder liner body is L2×c×R, wherein c is an empirical coefficient and R is the crank radius of the engine.
4. The cylinder liner according to claim 3, characterized in that: The linear profile of the end face of the convex line segment satisfies the parabola characteristic, and the diameter of the discrete points at each end face of the convex line segment is D1=D-ax 2 -b, wherein D is the inner diameter of the end face of the first straight line segment, the coordinate range of x is -0.5L1 to 0.5L1, and b is the protrusion of the vertex of the parabola relative to the first straight line segment.
5. The cylinder liner according to claim 4, characterized in that: The value range of b is 3 μm to 8 μm.
6. The cylinder liner according to claim 3, characterized in that: The dimension L2 of the concave line segment end surface along the axial direction of the cylinder liner body is L2=2×k×R, wherein k is an empirical coefficient and R is the crank radius of the engine.
7. The cylinder liner according to claim 6, characterized in that: The linear profile of the concave line segment end surface satisfies the parabola characteristic, and the diameter of the discrete points at each location of the concave line segment end surface is D2=D-a0x 2 -b0, wherein the coordinate range of x is -0.5L2 to 0.5L2, and b0 is the depression of the vertex of the parabola relative to the end surface of the first straight line segment.
8. The cylinder liner according to claim 7, characterized in that: The value range of b0 is 2 μm to 5 μm.
9. The cylinder liner according to claim 7, characterized in that: The end of the second straight line segment end face away from the concave line segment is the bottom end of the cylinder liner body, and the axial dimension of the second straight line segment end face along the cylinder liner is L3=L-L0-L1-L2, wherein L is the axial dimension between the top and bottom ends of the cylinder liner body.
10. An engine, characterized in that: It comprises a cylinder liner as claimed in any one of claims 1 to 9.