Deformation compensation structure suitable for scavenging type air cylinder sleeve
By introducing a combined water chamber and flexible adaptive matching technology into the scavenging cylinder liner of a two-stroke horizontally opposed piston engine, the problem of cylinder liner deformation caused by injector installation was solved, piston ring sealing was optimized and injector cooling was achieved, thereby improving engine efficiency and injector performance.
Patent Information
- Application Number
- CN202511126761.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-12
- Publication Date
- 2025-11-21
AI Technical Summary
In two-stroke horizontally opposed piston engines, the scavenging cylinder liner can deform due to injector installation, causing changes in cylinder clearance, which in turn leads to piston ring wear, combustion chamber leakage, increased oil consumption, and the risk of piston seizure.
It adopts a combination structure of cylinder liner, crankcase, injector bushing, pressure washer and injector bushing nut, and achieves sealing through copper gasket and rubber ring. It forms a combined water chamber to cool the injector bushing, compensate for cylinder liner deformation, adjust injector installation angle deviation, reduce friction loss and sealing performance.
It effectively compensates for cylinder liner deformation, reduces friction loss, optimizes sealing performance, reduces combustion chamber blow-by and oil consumption, improves engine efficiency, extends injector life, and ensures assembly reliability and sealing.
Smart Images
Figure CN120990762A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the field of engine, in particular to a structure for compensating deformation of a scavenge type cylinder liner. BACKGROUND
[0002] Two-stroke horizontal opposed piston engine has a compact main structure, a relatively high power-to-weight ratio, and can obtain higher power density than traditional engines, so it has a wide application in some special fields. The cylinder liner of the two-stroke horizontal opposed piston engine is a scavenge type cylinder liner, which generally needs to integrate an oil injector mounting hole on the cylinder liner to install the oil injector between the inlet and exhaust holes of the cylinder liner. Since the compression force of the oil injector directly or indirectly acts on the cylinder liner, the cylinder bore of the cylinder liner is deformed and enlarged, which may cause excessive stress in the cylinder liner, change the cylinder clearance, aggravate the piston ring wear, cause the piston ring sealing failure, increase the air leakage of the combustion chamber, increase the exhaust pressure of the crankcase, deteriorate the emission, increase the oil consumption, and even cause the piston to be pulled out of the cylinder. SUMMARY
[0003] Therefore, the present application aims to provide a structure for compensating deformation of a scavenge type cylinder liner, which can compensate the radial deformation of the cylinder bore of the cylinder liner, reduce the friction loss of the piston ring-liner system, optimize the sealing performance of the piston ring, reduce the air leakage of the combustion chamber and the oil consumption, reduce the exhaust pressure of the crankcase, improve the working efficiency of the engine, compensate for the installation angle deviation of the oil injector or the assembly size deviation of the cylinder liner and the crankcase, make the assembly more convenient and reliable, cool the head of the oil injector, effectively prevent the oil nozzle from overheating, avoid carbon deposition of the oil nozzle, high-temperature failure of the oil head, and improve the performance and service life of the oil injector.
[0004] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows: A structure for compensating deformation of a scavenge type cylinder liner, comprising a cylinder liner, a crankcase, an oil injector bushing, a compression gasket, and an oil injector bushing nut; the cylinder liner is installed into a cylinder liner seat hole provided in the crankcase; The cylinder liner is provided with one or more oil injector holes in the radial direction; The crankcase is provided with an oil injector bushing mounting hole corresponding to the oil injector hole; The oil injector bushing is arranged in the oil injector bushing mounting hole, the lower end of the oil injector bushing is threadedly connected into the oil injector hole of the cylinder liner, and a copper gasket is arranged between the oil injector bushing and the cylinder liner; A gap is arranged between the oil injector bushing and the oil injector bushing mounting hole; The compression gasket and the oil injector bushing are coaxially assembled together through a No. 1 rubber ring; a No. 2 rubber ring is arranged between the lower surface of the compression gasket and the crankcase to realize sealing; The fuel injector bushing nut is connected with the fuel injector bushing through the outer thread of the fuel injector bushing; the bottom of the fuel injector bushing nut is attached to the upper surface of the compression washer and compression is realized; The fuel injector bushing is provided with a mounting seat hole for mounting the fuel injector body and is communicated with the cylinder through the fuel injector hole; The cylinder sleeve is provided with a through cylinder water cavity, which can be communicated with the crankcase water cavities on both sides of the crankcase, thereby forming a closed combined water cavity between the fuel injector bushing, the cylinder sleeve and the crankcase.
[0005] Further, the cylinder sleeve and the crankcase are sealed through the cylinder sleeve sealing ring.
[0006] Further, the cooling liquid between the cylinder sleeve and the crankcase can cool the fuel injector bushing through the combined water cavity, thereby realizing the convection heat exchange of the fuel injector head.
[0007] Compared with the prior art, the structure suitable for compensating deformation of the scavenging cylinder sleeve has the following advantages: (1) The structure suitable for compensating deformation of the scavenging cylinder sleeve can effectively compensate the deformation of the inner hole of the cylinder sleeve, reduce the friction loss between the piston ring and the cylinder sleeve, optimize the sealing performance of the piston ring, reduce the blow-by gas of the combustion chamber and the oil consumption, reduce the exhaust pressure of the crankcase, and improve the working efficiency of the engine.
[0008] (2) The structure suitable for compensating deformation of the scavenging cylinder sleeve adopts a flexible self-adaptive matching technology, which can compensate for the installation angle deviation of the fuel injector or the assembly size deviation of the cylinder sleeve and the crankcase, so that the assembly is more convenient and the sealing is more reliable.
[0009] (3) The structure suitable for compensating deformation of the scavenging cylinder sleeve cools the fuel injector head, effectively prevents the fuel injector nozzle from overheating, thereby avoiding faults such as carbon deposition of the fuel injector nozzle and high-temperature failure of the oil head, and improving the performance and service life of the fuel injector. BRIEF DESCRIPTION OF DRAWINGS
[0010] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and the illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings: Figure 1 The structure suitable for compensating deformation of the scavenging cylinder sleeve according to the embodiments of the present application is shown in the accompanying drawings.
[0011] Explanation of reference signs: 1, cylinder liner; 2, crankcase; 3, injector bushing nut; 4, injector bushing; 5, No. 1 rubber ring; 6, compression washer; 7, No. 2 rubber ring; 8, combined water cavity; 9, cylinder liner water cavity; 10, copper gasket; 11, cylinder liner sealing ring; 12, injector hole; 13, injector bushing mounting hole. DETAILED DESCRIPTION
[0012] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.
[0013] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.
[0014] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0015] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
[0016] A structure suitable for compensating deformation of a scavenging type cylinder liner 1, as shown in Figure 1 The cylinder liner 1 is mounted into the cylinder liner 1 seat hole provided in the crankcase 2; The cylinder liner 1 is provided with one or more injector holes 12 in the radial direction; The crankcase 2 is provided with an injector bushing mounting hole 13 of the injector bushing 4 corresponding to the injector hole 12; The oil injector bushing 4 is arranged in the oil injector bushing mounting hole 13, the lower end of the oil injector bushing 4 is threadedly connected into the oil injector hole 12 of the cylinder liner 1, and the copper gasket 10 is arranged between the oil injector bushing 4 and the cylinder liner 1; the copper gasket 10 realizes the sealing of the high-temperature combustion gas in the cylinder liner 1 and the external cooling liquid; A gap is arranged between the oil injector bushing 4 and the oil injector bushing mounting hole 13; the gap enables the angle adjustment between the oil injector bushing 4 and the oil injector bushing mounting hole 13, can compensate for the installation angle deviation of the oil injector bushing 4 or the assembly size deviation of the cylinder liner 1 and the crankcase 2, makes the assembly more convenient, and the sealing of the combined water cavity is more reliable. After the oil injector is mounted into the oil injector bushing 4, the oil injector is fastened on the crankcase 2 through the oil injector pressing plate, thereby the pressing force is indirectly given in the radial direction of the cylinder liner 1, at this time, the oil injector bushing nut 3 is screwed into the external thread of the oil injector bushing 4, the bottom of the oil injector bushing nut 3 is attached to the upper surface of the pressing gasket 6, in the process of screwing the oil injector bushing nut 3, a force that reversely stretches the oil injector bushing 4 is generated, which can reduce the radial pressure generated by the oil injector on the cylinder liner 1, thereby the deformation of the cylinder liner 1 can be compensated for, for the pressing force of different oil injectors, the inner diameter micrometer gauge can be used to measure the cylinder bore while adjusting the torque of the oil injector bushing nut 3, so as to correct the deformation of the cylinder liner 1.
[0017] The pressing gasket 6 and the oil injector bushing 4 are coaxially assembled together through the No. 1 rubber ring 5; the No. 2 rubber ring 7 is arranged between the lower surface of the pressing gasket 6 and the crankcase 2 to realize the sealing. The oil injector bushing nut 3 is threadedly connected with the oil injector bushing 4 through the external thread of the oil injector bushing 4; the bottom of the oil injector bushing nut 3 is attached to the upper surface of the pressing gasket 6 and realizes the pressing. The oil injector bushing 4 is provided with a mounting seat hole for mounting the oil injector body, and the through-hole oil injector hole 12 is communicated with the cylinder; The cylinder liner 1 is provided with a through cylinder water cavity, the cylinder water cavity can be communicated with the crankcase water cavities on both sides of the crankcase 2, thereby forming a closed combined water cavity 8 between the oil injector bushing 4 and the cylinder liner 1 and the crankcase 2.
[0018] Preferably, the cylinder liner 1 and the crankcase 2 are sealed through the cylinder liner sealing ring 11.
[0019] Preferably, the cooling liquid between the cylinder liner 1 and the crankcase 2 can cool the oil injector bushing 4 through the combined water cavity 8, thereby realizing the convection heat exchange of the oil injector head; the overheat of the oil injector head can be avoided, and the performance and service life of the oil injector can be improved.
[0020] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A structure suitable for compensating deformation of a scavenge cylinder liner, characterized by: The cylinder liner, the crankcase, the injector bushing, the compression gasket and the injector bushing nut are included. The cylinder liner is provided with one or more injector holes in the radial direction. The crankcase is provided with injector bushing mounting holes corresponding to the injector holes. The injector bushing is arranged in the injector bushing mounting hole, the lower end of the injector bushing is screwed into the injector hole of the cylinder liner, and a copper gasket is arranged between the injector bushing and the cylinder liner. A gap is arranged between the injector bushing and the injector bushing mounting hole. The compression gasket and the injector bushing are coaxially assembled together through a No. 1 rubber ring, a No. 2 rubber ring is arranged between the lower surface of the compression gasket and the crankcase to realize sealing. The injector bushing nut is screwed with the injector bushing through the external thread of the injector bushing, the bottom of the injector bushing nut is attached to the upper surface of the compression gasket and realizes compression. The injector bushing is provided with a mounting seat hole for mounting the injector body and is communicated with the cylinder through the injector hole. The cylinder liner is provided with a through cylinder water cavity, which can be communicated with the crankcase water cavities on both sides of the crankcase, thereby forming a closed combined water cavity between the injector bushing and the cylinder liner and the crankcase.
2. The structure for compensating deformation of a scavenge type cylinder liner according to claim 1, characterized in that: The cylinder liner and the crankcase are sealed by arranging a cylinder liner sealing ring.
3. The structure for compensating deformation of a scavenge type cylinder liner according to claim 1, characterized in that: The cooling liquid between the cylinder liner and the crankcase can cool the injector bushing through the combined water cavity, thereby realizing convective heat exchange of the injector head.