Novel engine lower cylinder body structure

Abstract

The invention belongs to the technical field of engine cylinder bodies, and particularly relates to a novel engine lower cylinder body structure which comprises a cylinder body, a cooling cavity is formed in the inner side of the cylinder body, a liquid guide hole is formed in the side wall of the cooling cavity in a through connection mode, a supporting seat is fixedly arranged on the bottom face of the inner side of the cylinder body, and a clamping ring is fixedly arranged in the middle of the top face of the supporting seat. A reinforcing plate is fixedly arranged on the top face of the clamping ring, a connecting groove is formed in the top face of the cylinder body, a supporting ring is arranged in the middle of the connecting groove, a cylinder sleeve is arranged on the inner side of the supporting ring in an inserted mode, a top ring is fixedly arranged on the top face of the cylinder sleeve, a clamping groove is formed in the bottom face of the cylinder sleeve, and the clamping groove is clamped to the outer side of the clamping ring. An inserting groove is formed in the top face of the inner side of the clamping groove, and the reinforcing plate is inserted into the inner side of the inserting groove. When the cylinder sleeve is installed on the inner side of the lower cylinder body of the engine, the inserting groove in the bottom of the cylinder sleeve is connected with the reinforcing plate on the supporting base in an inserted mode, the reinforcing plate is made of high-strength materials, and the strength of the cylinder sleeve is enhanced through the reinforcing plate.

Description

Technical Field

[0001] The invention relates to the technical field of engine cylinder blocks, and in particular to a novel engine lower cylinder block structure. Background Art

[0002] Engine block (cylinder block) The engine block group of modern automobiles is mainly composed of cylinder block, cylinder head, cylinder head cover, cylinder liner, main bearing cover and oil pan. The engine block group is the support of the engine and the assembly base of the crankshaft connecting rod mechanism, valve mechanism and the main parts of the engine system. The cylinder head is used to close the top of the cylinder and form a combustion chamber together with the piston top and cylinder wall. In addition, the water jacket and oil channel in the cylinder head and the engine block and the oil pan are components of the cooling system and lubrication system respectively. The cylinder is directly bored on the cylinder block and is called an integral cylinder. The integral cylinder has good strength and rigidity and can withstand large loads. This type of cylinder has high material requirements and high cost. If the cylinder is manufactured into a separate cylindrical part (i.e., cylinder liner), and then installed in the cylinder body. In this way, the cylinder liner is made of wear-resistant high-quality materials, and the cylinder block can be made of lower-priced general materials, thereby reducing the manufacturing cost. At the same time, the cylinder liner can be taken out from the cylinder block, which is convenient for repair and replacement and can greatly extend the service life of the cylinder block.

[0003] There are two types of cylinder liners: dry cylinder liners and wet cylinder liners. The characteristic of wet cylinder liners is that after the cylinder liners are installed in the cylinder body, their outer wall is directly in contact with the cooling water, and the cylinder liners are only in contact with the cylinder body in a circular area at the top and bottom. It has good heat dissipation, uniform cooling, and is easy to process. Usually, only the inner surface needs to be finely processed, and the outer surface in contact with water does not need to be processed. It is easy to disassemble and assemble, but the disadvantage is that the strength and rigidity are not as good as those of dry cylinder liners, and it is easy to leak. Some anti-leakage measures should be taken.

[0004] Therefore, a new engine lower cylinder structure is proposed which can improve the strength of the cylinder liner and the sealing performance of the cylinder liner when in use. Summary of the invention

[0005] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a novel engine lower cylinder structure, which has the characteristics of high strength in use and good sealing effect. Through the lower cylinder body and cylinder liner, a support seat is arranged on the inner side of the lower cylinder body. When the cylinder liner with the plug-in groove is installed on the inner side of the lower cylinder body, the plug-in groove on the cylinder liner and the reinforcing plate on the support seat are connected and plugged together, so that the structural strength of the cylinder liner can be enhanced by the reinforcing plate after the cylinder liner is installed. The reinforcing plate is made of high-strength material to provide strength for the cylinder liner during engine operation. At the same time, the plug-in engagement between the support seat and the bottom of the cylinder liner improves the sealing strength of the connection, and the engagement between the top of the cylinder liner and the top of the lower cylinder body improves the overall sealing of the cylinder liner after installation to avoid leakage of external coolant.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A new type of engine lower cylinder structure, comprising a cylinder body, a cooling cavity is provided on the inner side of the cylinder body, a liquid guide hole is connected and penetrated on the side wall of the cooling cavity, a support seat is fixedly provided on the inner bottom surface of the cylinder body, a clamping ring is fixedly provided on the middle part of the top surface of the support seat, a reinforcing plate is fixedly provided on the top surface of the clamping ring, a plurality of reinforcing plates are provided, a first sealing gasket is provided on the outer side of the clamping ring, a retaining ring is provided on the outer side of the first sealing gasket, a connecting groove is provided on the top surface of the cylinder body, a supporting ring is provided in the middle part of the connecting groove, a cylinder sleeve is plugged in the inner side of the supporting ring, a top ring is fixedly provided on the top surface of the cylinder sleeve, the top ring is located on the top surface of the supporting ring, a clamping groove is provided on the bottom surface of the cylinder sleeve, the clamping groove is clamped on the outer side of the clamping ring, a plug-in groove is provided on the inner top surface of the clamping groove, the reinforcing plate is plugged in the inner side of the plug-in groove, a second sealing gasket is provided on the inner top surface of the plug-in groove, the second sealing gasket is located above the reinforcing plate, and the first sealing gasket is located below the cylinder sleeve.

[0007] As a preferred technical solution for a new type of engine lower cylinder structure of the present invention, a support pad is fixedly provided on the inner bottom surface of the connecting groove, the support pad is made of a flexible material, a docking port is opened in the middle of the support pad, the support ring is located on the inner side of the docking port, and the top ring is located on the inner side of the docking port.

[0008] As a preferred technical solution for a new type of engine lower cylinder structure of the present invention, a first through hole is opened on the edge of the support pad, a fixing screw is penetrated through the inner side of the first through hole, and the fixing screw is fixed on the inner side of the connecting groove, and a second through hole is opened on the edge of the support pad, a guide rod is penetrated through the inner side of the second through hole, and the guide rod is fixed on the inner side of the connecting groove.

[0009] As a preferred technical solution for a new type of engine lower cylinder structure of the present invention, a fixing plate is provided on the top surface of the support pad, and the fixing plate is engaged with the inner side of the connecting groove. A third through hole is opened at the edge of the fixing plate, and the third through hole is located above the first through hole. The fixing screw passes through the third through hole. A fourth through hole is opened at the edge of the fixing plate, and the fourth through hole is located above the second through hole. The guide rod passes through the fourth through hole.

[0010] As a preferred technical solution for a new type of engine lower cylinder structure of the present invention, a tightening nut is clamped on the inner side of the third through hole, and the tightening nut is threadedly connected to the outer side of the fixing screw. A threaded hole is provided in the middle part of the inner side of the tightening nut, and the fixing screw is threadedly connected to the inner side of the threaded hole, and a hexagonal groove is provided on the top surface of the threaded hole.

[0011] As a preferred technical solution of a new engine lower cylinder structure of the present invention, a mounting opening is opened in the middle of the fixing plate, the mounting opening is located above the docking port, and the mounting opening is located above the top ring.

[0012] As a preferred technical solution for a new engine lower cylinder structure of the present invention, the inner diameter of the mounting opening is the same as the inner diameter of the cylinder liner, and the outer diameter of the top ring is the same as the inner diameter of the docking opening.

[0013] As a preferred technical solution of a novel engine lower cylinder structure of the present invention, the top surface of the support pad is flush with the top surface of the top ring, and the top surface of the fixing plate is flush with the top surface of the cylinder body.

[0014] As a preferred technical solution of a new engine lower cylinder structure of the present invention, the size of the retaining ring is matched with the inner size of the retaining groove, and the size of the reinforcing plate is matched with the inner size of the plug-in groove.

[0015] As a preferred technical solution for a novel engine lower cylinder structure of the present invention, the height dimension of the fixing screw rod is smaller than the height dimension of the guide rod, and a rubber sleeve is fixedly provided at the lower end of the outer wall of the guide rod.

[0016] Compared with the prior art, the present invention has the following beneficial effects: During use, the present invention provides a cylinder body and a cylinder liner, a support seat is provided inside the cooling cavity of the cylinder body for installing the cylinder liner, a clamping ring and a plurality of reinforcing plates are provided on the support seat, a clamping groove and a plurality of plug-in grooves are provided on the bottom surface of the cylinder liner, a support ring is provided on the top surface of the cylinder body, and when the cylinder liner is installed inside the lower cylinder body of the engine, the cylinder liner is passed through the support ring, so that the plug-in groove at the bottom of the cylinder liner is plugged with the reinforcing plate on the support seat, so that the clamping groove is clamped with the clamping ring, and the reinforcing plate is made of a high-strength material, so that the strength of the cylinder liner can be enhanced by the reinforcing plate without affecting the cooling effect of the outer coolant on the cylinder liner; In addition, by arranging a first sealing gasket between the clamping ring and the outer retaining ring, and arranging a second sealing gasket on the inner side of the plug-in groove, after the cylinder liner is installed, the edge of the bottom surface of the cylinder liner is sealed by the first sealing gasket, and the connection between the inner side of the plug-in groove and the reinforcing plate is sealed and protected by the second sealing gasket, thereby realizing multiple sealing protection for the lower end of the cylinder liner, and when the fixing plate and the cylinder head are subsequently installed, the cylinder liner can be pressed by the cylinder head to realize the tightening of the two sealing gaskets, thereby further improving the sealing strength, and at the same time, the top ring on the top of the cylinder liner is against the top surface of the support ring, and the top ring and the outer side of the support ring are engaged with the support gasket of flexible material, and the inner wall of the docking interface on the support gasket can be used to realize the sealing between the support ring and the top ring, thereby realizing the sealing of the top of the cylinder liner, and the sealing strength of the cylinder liner installation is realized by the structure of the lower cylinder body, and the situation that the outer coolant is easy to leak; In addition, by arranging a fixing screw and a guide rod on the inner side of the connecting groove on the top surface of the cylinder body, the fixing plate can be installed on the top surface of the cylinder liner through the fixing screw, so that the fixing plate can press and limit the cylinder liner, thereby improving the stability of the cylinder liner installation. At the same time, by arranging a guide rod on the inner side of the connecting groove, the guide rod has a certain height. When the cylinder head is subsequently installed on the lower cylinder body, a through hole can be opened on the cylinder head to align with the guide rod, and the hole on the cylinder head can be engaged with the guide rod, thereby realizing the guided installation of the cylinder head, making its installation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a three-dimensional cross-sectional view of the present invention; Figure 3 It is a three-dimensional cross-sectional view of the cylinder body of the present invention; Figure 4 For the present invention Figure 3 The enlarged schematic diagram of point A in the middle; Figure 5 For the present invention Figure 3 The enlarged schematic diagram of point B in the middle; Figure 6 It is a schematic diagram of the connection between the cylinder sleeve, the support pad and the fixing plate of the present invention; Figure 7 For the present invention Figure 6 The enlarged schematic diagram of the center C; Figure 8 For the present invention Figure 6 The enlarged schematic diagram of point D in the middle; Fig. 9 It is a schematic diagram of the connection between the cylinder sleeve and the support pad of the present invention; Fig.10 It is a three-dimensional schematic diagram of the fixing plate of the present invention; Fig.11 It is a three-dimensional schematic diagram of the tightening nut of the present invention.

[0018] In the figure: 1. cylinder body; 11. cooling chamber; 12. liquid guide hole; 13. support seat; 131. snap ring; 132. reinforcement plate; 133. first sealing gasket; 134. retaining ring; 14. connecting groove; 141. support ring; 15. support pad; 151. first through hole; 152. second through hole; 153. docking port; 16. fixing screw; 17. guide rod; 171. rubber sleeve; 2. cylinder sleeve; 21. top ring; 22. plug-in groove; 23. second sealing gasket; 24. snap groove; 3. fixing plate; 31. third through hole; 32. tightening nut; 321. threaded hole; 322. hexagonal groove; 33. fourth through hole; 34. mounting port. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other. Example

[0023] Reference Figure 1-11The present invention provides the following technical solutions: a new type of engine lower cylinder structure, including a cylinder body 1, a cooling chamber 11 is provided on the inner side of the cylinder body 1, and a liquid guide hole 12 is provided on the side wall of the cooling chamber 11. When in use, the coolant flows through the inner side of the cooling chamber 11 to achieve cooling of the cylinder liner 2. The use principle can refer to the wet cylinder liner in the prior art. The use principle of the engine cylinder structure in this solution belongs to the common prior art, so it is not repeated here. A support seat 13 is fixedly provided on the inner bottom surface of the cylinder body 1 for installing the cylinder liner 2. Please refer to the attached Figure 2 , Attachment Figure 3 , Attachment Figure 4 and attached Figure 6 A clamping ring 131 is fixedly provided in the middle of the top surface of the support seat 13, and a reinforcing plate 132 is fixedly provided on the top surface of the clamping ring 131. There are multiple reinforcing plates 132, and the reinforcing plates 132 are made of high-strength material; a connecting groove 14 is provided on the top surface of the cylinder body 1, and a supporting ring 141 is provided in the middle of the connecting groove 14. The inner side of the supporting ring 141 is plugged with a cylinder sleeve 2, and a top ring 21 is fixedly provided on the top surface of the cylinder sleeve 2. The top ring 21 is located on the top surface of the supporting ring 141, and a clamping groove 24 is provided on the bottom surface of the cylinder sleeve 2. The clamping groove 24 is clamped on the outer side of the clamping ring 131. The clamping ring 131 is engaged with the clamping groove 24 to realize the lower end of the cylinder sleeve 2. The limit end is limited, the inner top surface of the slot 24 is provided with a plug-in slot 22, and the reinforcing plate 132 is plugged into the inner side of the plug-in slot 22, so that the cylinder liner 2 and the engine cylinder block 1 are more tightly connected; the size of the retaining ring 131 is adapted to the inner size of the slot 24, and the size of the reinforcing plate 132 is adapted to the inner size of the plug-in slot 22; when the cylinder liner 2 is installed on the inner side of the engine cylinder block 1, the reinforcing plate 132 is added and plugged into the inner side of the side wall of the cylinder liner 2, so that the cylinder liner 2 is installed more tightly and has better strength than the wet cylinder liner in the prior art, and does not affect the cooling of the cylinder liner 2 by the outer coolant.

[0024] Reference Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9As shown, specifically, a first sealing gasket 133 is provided on the outer side of the clamping ring 131, and a retaining ring 134 is provided on the outer side of the first sealing gasket 133. The first sealing gasket 133 is made of flexible material and is located between the two rings; a second sealing gasket 23 is provided on the inner top surface of the plug-in groove 22, and the second sealing gasket 23 is located above the reinforcing plate 132, and abuts against the second sealing gasket 23 when the reinforcing plate 132 and the plug-in groove 22 are tightly plugged in. The first sealing gasket 133 is located below the cylinder sleeve 2, and the outer side of the lower end abuts against the first sealing gasket 133 when the cylinder sleeve 2 is tightly installed (the lower end of the cylinder sleeve 2 is distinguished by the plug-in groove 22, and the length of the outer ring is smaller than the length of the inner ring, so that the inner ring can press against the support seat 13 while reserving installation space for the first sealing gasket 133); a supporting pad 15 is fixedly provided on the inner bottom surface of the connecting groove 14, and the supporting pad 15 is The support pad 15 is made of flexible material, and a docking port 153 is provided in the middle part thereof, the support ring 141 is located on the inner side of the docking port 153, and the top ring 21 is located on the inner side of the docking port 153; the top surface of the support pad 15 is flush with the top surface of the top ring 21, and the flexible support pad 15 is located on the top outer side of the top ring 21 for protection; this scheme realizes sealing protection of the lower end and the top end of the cylinder liner 2 by setting the first sealing pad 133, the second sealing pad 23 and the support pad 15, and at the same time, the two sealing pads can provide multiple protections for the lower end of the cylinder liner 2, and the protection effect is good. When the subsequent fixing plate 3 presses the cylinder liner 2, the sealing pad can be squeezed more tightly, further improving the sealing strength of the connection, and cooperating with the protection of the support pad 15, the sealing strength of the overall cylinder liner 2 after installation is improved, and the probability of leakage of the outer coolant is greatly reduced.

[0025] Reference Figure 1 , Figure 2 , Figure 6 , Fig.10 and Fig.11As shown, specifically, a first through hole 151 is provided on the edge of the support pad 15, and a fixing screw 16 is penetrated through the inner side of the first through hole 151, and the fixing screw 16 is fixed to the inner side of the connecting groove 14; a fixing plate 3 is provided on the top surface of the support pad 15, and the fixing plate 3 is engaged with the inner side of the connecting groove 14 and is adapted to the inner side size of the connecting groove 14, and a third through hole 31 is provided on the edge of the fixing plate 3, and the third through hole 31 is located above the first through hole 151, and the fixing screw 16 penetrates the third through hole 31; a tightening nut 32 is engaged with the inner side of the third through hole 31, and the tightening nut 32 is tightened on the screw to achieve fixed installation of the fixing plate 3, the tightening nut 32 is threadedly connected to the outer side of the fixing screw 16, and a threaded hole 321 is provided in the middle part of the inner side of the tightening nut 32, and the fixing screw 16 is threadedly connected It is connected to the inner side of the threaded hole 321, and a hexagonal groove 322 is provided on the top surface of the threaded hole 321 for inserting an external screwing tool; a mounting opening 34 is provided in the middle of the fixing plate 3, and the mounting opening 34 is located above the docking port 153, and the mounting opening 34 is located above the top ring 21; the inner ring diameter of the mounting opening 34 is the same as the inner ring diameter of the cylinder liner 2, and the outer ring diameter of the top ring 21 is the same as the inner ring diameter of the docking port 153; the top surface of the fixing plate 3 is flush with the top surface of the cylinder body 1; through the setting of the fixing plate 3, the fixing plate 3 is installed on the top of the support pad 15 and the cylinder liner 2 in this scheme, so that the fixing plate 3 can be tightened against the cylinder liner 2, which can improve the installation sealing strength of the cylinder liner 2 while avoiding the deformation of the cylinder liner 2 caused by some knocking operations during the conventional installation of the cylinder liner 2, thereby improving the convenience of installing the cylinder liner 2.

[0026] Reference Figure 1 , Figure 2 and Figure 3 As shown, specifically, a second through hole 152 is opened on the edge of the support pad 15, and a guide rod 17 is penetrated through the inner side of the second through hole 152, and the guide rod 17 is fixed on the inner side of the connecting groove 14; a fourth through hole 33 is opened on the edge of the fixing plate 3, and the fourth through hole 33 is located above the second through hole 152, and the guide rod 17 penetrates the fourth through hole 33; the height dimension of the fixing screw 16 is smaller than the height dimension of the guide rod 17, and a rubber sleeve 171 is fixedly provided at the lower end of the outer wall of the guide rod 17. When the cylinder head is installed on the top of the cylinder body 1, a hole is opened on the cylinder head by conventional means (which belongs to the common prior art and is therefore not described in detail), so that the hole is aligned with the guide rod 17, and guidance can be provided when the cylinder head is installed, thereby improving the convenience of cylinder head installation.

[0027] The use process and working principle of the present invention: When the present invention is used, first, the first sealing gasket 133 is clamped between the clamping ring 131 and the retaining ring 134 on the support seat 13, and the second sealing gasket 23 is clamped to the inner side of the plug-in groove 22 on the cylinder sleeve 2. When installing the cylinder sleeve 2, the cylinder sleeve 2 passes through the support ring 141 on the top of the cylinder body 1, so that the clamping groove 24 on the cylinder sleeve 2 is aligned with the clamping ring 131 on the support seat 13, and the plug-in groove 22 inside the clamping groove 24 is aligned with the reinforcing plate 132 on the clamping ring 131. The reinforcing plate 132 is plugged into the inner side of the plug-in groove 22, so that the lower end of the cylinder sleeve 2 is plugged into the clamping ring 131 and the retaining ring 1 34, and at the same time, the top ring 21 on the top of the cylinder liner 2 is engaged with the top of the support ring 141 to achieve the installation of the cylinder liner 2. When the cylinder liner 2 is used later, the strength and installation stability of the cylinder liner 2 are improved by plugging in the inner high-strength reinforcement plate 132 without affecting the cooling effect of the outer coolant. At the same time, the sealing strength of the cylinder liner 2 during installation and use is improved through the engagement and sealing of multiple sealing gaskets. Subsequently, the fixing plate 3 is fixedly installed on the top of the cylinder liner 2 through the tightening nut 32 to achieve the fixation of the cylinder liner 2. At the same time, the fixing plate 3 can be squeezed to further improve the tightness of the connection between the cylinder liner 2 and the sealing gasket, and the sealing strength is further improved.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific embodiments, or to perform equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A novel engine lower cylinder structure, comprising a cylinder block (1), characterized in that: A cooling chamber (11) is provided on the inner side of the cylinder body (1), a liquid guide hole (12) is provided on the side wall of the cooling chamber (11), a support seat (13) is fixedly provided on the inner bottom surface of the cylinder body (1), a clamping ring (131) is fixedly provided in the middle of the top surface of the support seat (13), a reinforcing plate (132) is fixedly provided on the top surface of the clamping ring (131), a plurality of reinforcing plates (132) are provided, a first sealing gasket (133) is provided on the outer side of the clamping ring (131), a retaining ring (134) is provided on the outer side of the first sealing gasket (133), a connecting groove (14) is provided on the top surface of the cylinder body (1), and a supporting ring (141) is provided in the middle of the connecting groove (14). A cylinder sleeve (2) is inserted into the inner side of the support ring (141), a top ring (21) is fixedly provided on the top surface of the cylinder sleeve (2), and the top ring (21) is located on the top surface of the support ring (141). A clamping groove (24) is provided on the bottom surface of the cylinder sleeve (2), and the clamping groove (24) is clamped on the outer side of the clamping ring (131). An insertion groove (22) is provided on the inner top surface of the clamping groove (24). The reinforcing plate (132) is inserted into the inner side of the insertion groove (22), and a second sealing gasket (23) is provided on the inner top surface of the insertion groove (22). The second sealing gasket (23) is located above the reinforcing plate (132), and the first sealing gasket (133) is located below the cylinder sleeve (2).

2. A novel engine lower cylinder structure according to claim 1, characterized in that: A support pad (15) is fixedly provided on the inner bottom surface of the connection groove (14); the support pad (15) is made of a flexible material; a docking port (153) is provided in the middle of the support pad (15); the support ring (141) is located on the inner side of the docking port (153); and the top ring (21) is located on the inner side of the docking port (153).

3. A novel engine lower cylinder structure according to claim 2, characterized in that: A first through hole (151) is formed at an edge of the support pad (15), a fixing screw (16) is penetrated through the inner side of the first through hole (151), and the fixing screw (16) is fixed to the inner side of the connecting groove (14); a second through hole (152) is formed at an edge of the support pad (15), a guide rod (17) is penetrated through the inner side of the second through hole (152), and the guide rod (17) is fixed to the inner side of the connecting groove (14).

4. A novel engine lower cylinder structure according to claim 3, characterized in that: A fixing plate (3) is provided on the top surface of the support pad (15), the fixing plate (3) is engaged with the inner side of the connecting groove (14), a third through hole (31) is provided on the edge of the fixing plate (3), the third through hole (31) is located above the first through hole (151), the fixing screw (16) passes through the third through hole (31), a fourth through hole (33) is provided on the edge of the fixing plate (3), the fourth through hole (33) is located above the second through hole (152), and the guide rod (17) passes through the fourth through hole (33).

5. A novel engine lower cylinder structure according to claim 4, characterized in that: A tightening nut (32) is provided on the inner side of the third through hole (31), the tightening nut (32) is threadedly connected to the outer side of the fixing screw (16), a threaded hole (321) is provided in the middle of the inner side of the tightening nut (32), the fixing screw (16) is threadedly connected to the inner side of the threaded hole (321), and a hexagonal groove (322) is provided on the top surface of the threaded hole (321).

6. A novel engine lower cylinder structure according to claim 5, characterized in that: A mounting opening (34) is provided in the middle of the fixing plate (3), the mounting opening (34) is located above the docking port (153), and the mounting opening (34) is located above the top ring (21).

7. A novel engine lower cylinder structure according to claim 6, characterized in that: The inner diameter of the mounting opening (34) is the same as the inner diameter of the cylinder sleeve (2), and the outer diameter of the top ring (21) is the same as the inner diameter of the docking opening (153).

8. A novel engine lower cylinder structure according to claim 7, characterized in that: The top surface of the support pad (15) is flush with the top surface of the top ring (21), and the top surface of the fixing plate (3) is flush with the top surface of the cylinder body (1).

9. A novel engine lower cylinder structure according to claim 8, characterized in that: The size of the clamping ring (131) matches the inner size of the clamping groove (24), and the size of the reinforcing plate (132) matches the inner size of the plug-in groove (22).

10. A novel engine lower cylinder structure according to claim 9, characterized in that: The height dimension of the fixing screw rod (16) is smaller than the height dimension of the guide rod (17), and a rubber sleeve (171) is fixedly provided at the lower end of the outer wall of the guide rod (17).

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