Cylinder structure, water-cooled engine and motorcycle

Abstract

The present invention discloses a cylinder structure, a water-cooled engine and a motorcycle. The cylinder structure includes a cylinder body, the cylinder body has an inner cavity and a cooling cavity, the inner cavity is used to install a cylinder sleeve, the cooling cavity is arranged in an annular shape on the cylinder body and is located on the outer periphery of the inner cavity; the cylinder body is also provided with a bottom groove and a water outlet, the bottom groove is arranged on the bottom wall of the cooling cavity, the bottom of the bottom groove is lower than the bottom of the cooling cavity, and the water outlet is communicated with the bottom groove. The cylinder body is connected with the cylinder sleeve through the inner cavity, and a water jacket structure is formed by the arrangement of the cooling cavity to meet the cooling requirements of the cylinder sleeve; because the bottom groove is arranged on the bottom wall of the cooling cavity, and the bottom of the bottom groove is lower than the bottom of the cooling cavity, the cooling water and impurities in the cooling cavity can be converged into the bottom groove, and then discharged through the water outlet communicated with the bottom groove, so that the cooling water and impurities in the cooling cavity are completely discharged, avoiding a series of problems such as the difficulty in controlling the amount of cooling water added and the blockage of the radiator caused by the difficulty in completely discharging the cooling water and impurities.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a cylinder structure, a water-cooled engine and a motorcycle. Background Art

[0002] According to the different cooling media, engines are divided into air-cooled engines and water-cooled engines. Among them, water-cooled engines refer to engines that use water as a cooling medium.

[0003] The cylinder structure of a water-cooled engine includes a cylinder body and a cylinder liner. The cylinder liner is embedded in the cylinder body. The cylinder body has a cooling cavity, which is arranged around the outer periphery of the cylinder liner, forming a so-called water jacket structure. When working, cooling water circulates in the cooling cavity to cool the cylinder liner. However, in the traditional structure, it is not easy to completely discharge the cooling water and impurities in the cooling cavity, which will lead to the following two problems:

[0004] 1. The cooling water is not completely discharged, which makes it difficult to accurately control the amount of cooling water added, thus affecting the cooling effect of the cylinder structure;

[0005] 2. Incomplete discharge of impurities can easily lead to radiator blockage and even cause abnormalities in the engine's cooling system, resulting in cylinder seizure. Summary of the invention

[0006] Based on this, in order to solve the problem that cooling water and impurities in the cooling chamber are difficult to discharge, it is necessary to provide a cylinder structure, a water-cooled engine and a motorcycle; the cylinder structure can improve the discharge effect of cooling water and impurities in the cooling chamber, so that the cooling water and impurities are completely discharged; the water-cooled engine adopts the aforementioned cylinder structure, which improves the discharge capacity of cooling water and impurities in the cooling chamber of the water-cooled engine and improves the cooling effect; the motorcycle adopts the aforementioned engine, which improves the cooling effect of the engine cylinder and ensures power output.

[0007] The technical solution is as follows:

[0008] One embodiment provides a cylinder structure, comprising:

[0009] A cylinder body, wherein the cylinder body has an inner cavity and a cooling cavity, wherein both the inner cavity and the cooling cavity are extended along the length direction of the cylinder body, the inner cavity is used to install the cylinder sleeve, and the cooling cavity is arranged in an annular shape on the cylinder body and is located on the outer periphery of the inner cavity;

[0010] The cylinder body is also provided with a bottom groove and a water outlet. The bottom groove is opened on the bottom wall of the cooling cavity. The bottom of the bottom groove is lower than the bottom of the cooling cavity. The water outlet is communicated with the bottom groove.

[0011] In the above-mentioned cylinder structure, the cylinder body is connected with the cylinder liner through the inner cavity, and the water jacket structure is formed by the setting of the cooling cavity to meet the cooling requirements of the cylinder liner; because the bottom groove is opened on the bottom wall of the cooling cavity, and the bottom of the bottom groove is lower than the bottom of the cooling cavity, the cooling water and impurities in the cooling cavity can converge into the bottom groove, and then be discharged through the water outlet hole connected to the bottom groove, so that the cooling water and impurities in the cooling cavity are completely discharged, avoiding a series of problems such as difficulty in controlling the amount of cooling water added and radiator blockage due to the difficulty in completely discharging the cooling water and impurities.

[0012] The technical solution is further described below:

[0013] In one embodiment, the bottom groove is opened on the bottom wall corresponding to the lowest position of the cooling cavity.

[0014] In one embodiment, the bottom groove is a slot hole extending along the length direction of the cylinder body; or the bottom groove is an arc-shaped groove arranged around the outer circumference of the cylinder body, and the arc-shaped groove extends along the length direction of the cylinder body.

[0015] In one of the embodiments, the cylinder body is further provided with a water inlet hole, the water inlet hole is opened on the side of the cylinder body, and the water inlet hole is communicated with the cooling cavity.

[0016] In one of the embodiments, the water inlet hole and the water outlet hole are both opened on the exhaust side of the cylinder body; the opening position of the water outlet hole is lower than the opening position of the water inlet hole.

[0017] In one embodiment, the hole axis of the water inlet hole is arranged at an angle to the hole axis of the water outlet hole;

[0018] The cooling cavity is a circular cavity, and the hole axis of the water inlet hole is tangent to the cavity wall contour of the cooling cavity.

[0019] In one embodiment, the cylinder body is further provided with a water inlet end, the water inlet end is protruded toward the outside of the cylinder body, the water inlet hole is provided on the water inlet end and extends along the protruding direction of the water inlet end;

[0020] The cylinder body is also provided with a water outlet end, the water outlet end is protruding toward the outside of the cylinder body, the water outlet hole is opened on the water outlet end and extends along the protruding direction of the water outlet end;

[0021] The cylinder body is also provided with reinforcing ribs, and the reinforcing ribs are connected between the side wall of the water outlet end and the side wall of the cylinder body.

[0022] In one of the embodiments, the cylinder structure further includes a cylinder sleeve, and the cylinder sleeve is sleeved in the cylinder body through the inner cavity.

[0023] Another embodiment provides a water-cooled engine, comprising a cylinder structure as described in any of the above technical solutions.

[0024] The above-mentioned water-cooled engine adopts the above-mentioned cylinder structure. Since the bottom groove is opened on the bottom wall of the cooling cavity and the bottom of the bottom groove is lower than the bottom of the cooling cavity, the cooling water and impurities in the cooling cavity can flow into the bottom groove and then be discharged through the water outlet hole connected to the bottom groove, so that the cooling water and impurities in the cooling cavity are completely discharged, avoiding a series of problems such as difficulty in controlling the amount of cooling water added and radiator blockage caused by the difficulty in completely discharging the cooling water and impurities, thereby improving the cooling effect.

[0025] Another embodiment provides a motorcycle, comprising a water-cooled engine as described in the above technical solution.

[0026] The above-mentioned motorcycle adopts the aforementioned water-cooled engine. Since a bottom groove is provided in the cylinder structure, and the bottom groove is opened on the bottom wall of the cooling chamber, the bottom of the bottom groove is lower than the bottom of the cooling chamber, so that the cooling water and impurities in the cooling chamber can converge into the bottom groove, and then be discharged through the water outlet hole connected to the bottom groove, so that the cooling water and impurities in the cooling chamber are completely discharged, avoiding a series of problems such as difficulty in controlling the amount of cooling water added and radiator blockage caused by the difficulty in completely discharging the cooling water and impurities, thereby improving the cooling effect of the engine and ensuring power output. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] In addition, the drawings are not drawn in a 1:1 scale, and the relative sizes of various elements are drawn only as examples in the drawings and are not necessarily drawn in true scale.

[0030] Figure 1 It is an overall schematic diagram of the cylinder structure in an embodiment of the present invention;

[0031] Figure 2 for Figure 1 An overall front view of the cylinder structure in the embodiment;

[0032] Figure 3 for Figure 2 AA cross-sectional view of the cylinder structure in the embodiment.

[0033] Notes on the attached drawings:

[0034] 100, cylinder body; 110, inner cavity; 120, cooling cavity; 130, bottom groove; 140, water inlet terminal; 141, water inlet hole; 142, water inlet pipe; 150, water outlet terminal; 151, water outlet hole; 160, reinforcing rib; 170, chain cavity; 180, skirt; 200, cylinder liner. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below with reference to the accompanying drawings:

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0037] Please refer to Figures 1 to 3 One embodiment provides a cylinder structure, including a cylinder body 100, wherein the cylinder body 100 has an inner cavity 110 and a cooling cavity 120, wherein the inner cavity 110 and the cooling cavity 120 are both extended along the length direction of the cylinder body 100, wherein the inner cavity 110 is used for installing a cylinder liner 200, and the cooling cavity 120 is arranged in an annular shape on the cylinder body 100 and is located on the outer periphery of the inner cavity 110.

[0038] like Figure 3 As shown, the cylinder body 100 is further provided with a bottom groove 130 and a water outlet 151 . The bottom groove 130 is opened on the bottom wall of the cooling cavity 120 . The bottom of the bottom groove 130 is lower than the bottom of the cooling cavity 120 . The water outlet 151 is communicated with the bottom groove 130 .

[0039] In the cylinder structure, the cylinder body 100 is connected with the cylinder liner 200 through the inner cavity 110, and the water jacket structure is formed by the setting of the cooling cavity 120 to meet the cooling requirements of the cylinder liner 200; because the bottom groove 130 is opened on the bottom wall of the cooling cavity 120, and the bottom of the bottom groove 130 is lower than the bottom of the cooling cavity 120, the cooling water and impurities in the cooling cavity 120 can be converged into the bottom groove 130, and then discharged through the water outlet 151 communicated with the bottom groove 130, so that the cooling water and impurities in the cooling cavity 120 are completely discharged, avoiding a series of problems such as the difficulty in controlling the amount of cooling water added and radiator blockage caused by the difficulty in completely discharging the cooling water and impurities; at the same time, it can also reduce the failure rate of the cooling system of the water-cooled engine.

[0040] Combination Figure 1 and Figure 3 In the embodiment shown, the cooling chamber 120 of the cylinder body 100 is arranged around the outer periphery of the inner cavity 110. Since the cylinder liner 200 is sleeved in the inner cavity 110 of the cylinder body 100, the cooling chamber 120 is also equivalent to being arranged around the outer periphery of the cylinder liner 200. When the cooling water circulates in the cooling chamber 120, heat is exchanged through the cavity wall between the cooling chamber 120 and the inner cavity 110, and the cylinder liner 200 contacts the cavity wall of the inner cavity 110, thereby cooling and dissipating heat of the cylinder liner 200 through heat exchange of the cavity wall.

[0041] like Figure 3 From the perspective shown, the length direction of the cylinder body 100 is the up-down direction, the inner cavity 110 is arranged to pass through the cylinder body 100 along the up-down direction, and the cooling cavity 120 also extends along the up-down direction. Specifically, the cooling cavity 120 extends in a downward direction, but does not pass through the cylinder body 100, and the cooling cavity 120 is arranged around the periphery of the inner cavity 110.

[0042] like Figure 3 From the perspective shown, the bottom groove 130 is opened on the right side of the cooling chamber 120, and the bottom groove 130 is opened on the bottom wall of the cooling chamber 120 and extends downward, but also does not penetrate the cylinder body 100, and the water outlet 151 is connected to the bottom groove 130. Figure 3 It can be seen that the bottom of the bottom groove 130 is lower than the bottom of the cooling chamber 120. The advantage of this arrangement is that if there is cooling water and impurities retained in the cooling chamber 120, they will inevitably converge toward the bottom groove 130 due to the reason that water flows to lower places, and after converging in the bottom groove 130, they will be discharged from the water outlet 151, so that the cooling water and impurities will not be gathered in the cooling chamber 120, and the cooling water and impurities in the cooling chamber 120 can always be completely discharged.

[0043] In one embodiment, please refer to Figure 3 The bottom groove 130 is opened on the bottom wall corresponding to the lowest position of the cooling cavity 120 .

[0044] like Figure 3 In the illustrated embodiment, all bottom walls of the cooling cavity 120 are at the same height, and any position of the bottom groove 130 on the bottom wall can ensure that cooling water and impurities at the bottom of the cooling cavity 120 can be gathered in the bottom groove 130 and discharged from the water outlet 151.

[0045] In other embodiments, if the bottom wall of the cooling chamber 120 is not at the same height, the bottom groove 130 is opened at the lowest position of the bottom wall. In this way, the cooling water and impurities in the cooling chamber 120 can first be gathered at the lowest position in the cooling chamber 120, then enter the bottom groove 130 at that position, and finally be discharged from the water outlet 151, thereby ensuring that the cooling water and impurities in the cooling chamber 120 can be completely discharged.

[0046] In one embodiment, please refer to Figure 3 The bottom groove 130 is a slot hole extending along the length direction of the cylinder body 100 .

[0047] Depend on Figure 3 From the perspective shown, it can be seen that the bottom groove 130 is roughly extended downward from the bottom wall of the cooling cavity 120. The bottom groove 130 can be a slot structure, such as a circular slot or a square slot opened on the bottom wall of the cooling cavity 120.

[0048] In other embodiments, the bottom groove 130 is an arc-shaped groove disposed around the outer circumference of the cylinder body 100 , and the arc-shaped groove extends along the length direction of the cylinder body 100 .

[0049] For example, the bottom groove 130 can be a small arc-shaped groove arranged around the outer circumference of the cylinder body 100, and the arc-shaped groove is also extended downward from the bottom wall of the cooling chamber 120. Although the bottom groove 130 is not a circular groove hole, but an arc-shaped groove, it can also play the role of gathering cooling water and impurities at the bottom of the cooling chamber 120.

[0050] In one embodiment, please refer to Figure 3 The cylinder body 100 is further provided with a water inlet hole 141 , which is opened on the side of the cylinder body 100 and communicates with the cooling chamber 120 .

[0051] like Figure 3 In the embodiment shown, the water inlet hole 141 passes through the outer wall of the cylinder body 100 (which can be understood as Figure 3 The outer cavity wall of the cooling cavity 120 is formed so that the water inlet hole 141 is connected to the cooling cavity 120, and cooling water is transported into the cooling cavity 120 through the water inlet hole 141.

[0052] like Figure 3In the perspective shown, the water inlet 141 is located at a position higher than the bottom groove 130 .

[0053] For example, Figure 3 The middle water inlet hole 141 is opened approximately at the middle of the cooling cavity 120 .

[0054] In one embodiment, please refer to Figure 1 and Figure 2 The water inlet hole 141 and the water outlet hole 151 are both opened on the exhaust side of the cylinder body 100 .

[0055] Generally speaking, the exhaust side of the cylinder structure will cause the temperature of the cylinder structure on the exhaust side to be higher due to the exhaust gas discharge. If the cooling design is not considered for this problem, the final product will only have the same cooling capacity as other areas. However, due to the higher temperature here, other areas can meet the cooling requirements while the exhaust side area cannot meet the cooling requirements. Therefore, the heat load on the intake and exhaust sides of the cylinder structure will be uneven, which will eventually cause uneven deformation of the cylinder, and deformation of various hole structures on the cylinder structure, which will eventually affect the performance and service life of the entire engine.

[0056] Therefore, taking this problem into consideration, the water inlet hole 141 and the water outlet hole 151 are both opened on the exhaust side of the cylinder body 100, so that the low-temperature cooling water that has just entered will first flow through the exhaust side of the cylinder body 100 to increase the cooling effect. At the same time, it will also pass through the exhaust side of the cylinder body 100 when being discharged, so as to increase the cooling time of the water flow on the exhaust side and improve the cooling effect, so as to achieve the cooling effect of the exhaust side roughly equivalent to the cooling effect of other areas as much as possible.

[0057] In one embodiment, please refer to Figures 1 to 3 , the opening position of the water outlet hole 151 is lower than the opening position of the water inlet hole 141.

[0058] like Figures 1 to 3 In the embodiment shown, the water outlet hole 151 is located below the water inlet hole 141. The purpose of such arrangement is that cooling water enters the cooling cavity 120 through the upper water inlet hole 141, and after the cooling water circulates in the cooling cavity 120, it is discharged through the lower water outlet hole 151, so that the cooling water flows from top to bottom in sequence, thereby improving the cooling effect.

[0059] In one embodiment, please refer to Figures 1 to 3 The hole axis of the water inlet hole 141 and the hole axis of the water outlet hole 151 are arranged at an angle.

[0060] Combination Figures 1 to 3 It can be seen that the hole axis of the water inlet hole 141 is not parallel to the hole axis of the water outlet hole 151 .

[0061] In one embodiment, please refer to Figures 1 to 3 The cooling cavity 120 is a circular cavity, and the hole axis of the water inlet hole 141 is tangent to the cavity wall contour of the cooling cavity 120 .

[0062] Combination Figure 1 and Figure 3 In the embodiment shown, the cooling cavity 120 is a circular cavity, the water outlet hole 151 is arranged approximately orthogonal to the circular cavity, and the hole axis of the water inlet hole 141 is approximately tangent to the cavity wall contour of the circular cavity, so that the cooling water entering the cooling cavity 120 through the water inlet hole 141 can enter tangentially along the cavity wall of the cooling cavity 120, thereby improving the cooling effect.

[0063] In one embodiment, please refer to Figures 1 to 3 The cylinder body 100 is also provided with a water inlet end 140 , and the water inlet end 140 is protruded toward the outer side of the cylinder body 100 . The water inlet hole 141 is provided on the water inlet end 140 and extends along the protruding direction of the water inlet end 140 .

[0064] like Figure 1 and Figure 2 As shown, the outer wall of the cylinder body 100 is provided with a water inlet terminal 140, and the water inlet terminal 140 can be integrally arranged with the cylinder body 100. The water inlet terminal 140 protrudes toward the outer side of the cylinder body 100, and the water inlet hole 141 is opened on the water inlet terminal 140, and the hole axis of the water inlet hole 141 is arranged along the protruding direction of the water inlet terminal 140.

[0065] Alternatively, if Figure 1 and Figure 2 In the illustrated embodiment, the cooling cavity 120 is a circular cavity, and the axis of the water inlet hole 141 is tangent to the cavity wall contour of the cooling cavity 120. Therefore, the water inlet terminal 140 is integrally arranged with the cylinder body 100 and is roughly inclined. The water inlet terminal 140 is also roughly tangent to the outer wall of the cylinder body 100, so that the axis of the water inlet hole 141 is tangent to the cavity wall contour of the cooling cavity 120, which will not be repeated.

[0066] Optionally, a water inlet pipe 142 is provided on the cylinder body 100, and the water inlet pipe 142 can be detachably connected to the water inlet terminal 140 through the water inlet hole 141, such as by screwing, and the water inlet pipe 142 can also be detachably connected to the outer wall of the water inlet terminal 140, such as by screwing, so as to facilitate communication with the corresponding pipeline, which is not repeated here.

[0067] In one embodiment, please refer to Figures 1 to 3 The cylinder body 100 is also provided with a water outlet end 150 , and the water outlet end 150 is protruded toward the outer side of the cylinder body 100 . The water outlet hole 151 is provided on the water outlet end 150 and extends along the protruding direction of the water outlet end 150 .

[0068] like Figure 3 In the perspective shown, the water outlet end 150 is horizontally extended from the right side of the cylinder body 100 toward the right end, and the water outlet end 150 is integrally provided with the cylinder body 100. The water outlet hole 151 is opened on the water outlet end 150 and extends in the left and right directions to penetrate the outer wall of the water outlet end 150 and the cylinder body 100 (which can be understood as Figure 3 The outer cavity wall of the middle cooling cavity 120 ) is connected to the water outlet hole 151 so that the water outlet hole 151 is connected to the bottom groove 130 .

[0069] Of course, it is understandable that the setting position of the water outlet head 150 should correspond to the opening position of the bottom groove 130 so that the opened water outlet hole 151 is connected to the bottom groove 130.

[0070] Optionally, the bottom of the water outlet hole 151 is substantially equivalent to the bottom of the bottom tank 130 , so that the cooling water and impurities in the bottom tank 130 can be smoothly discharged through the water outlet hole 151 .

[0071] In one embodiment, please refer to Figures 1 to 3 The cylinder body 100 is further provided with a reinforcing rib 160 , and the reinforcing rib 160 is connected between the side wall of the water outlet end 150 and the side wall of the cylinder body 100 .

[0072] like Figure 1 and Figure 2 In the illustrated embodiment, a reinforcing rib 160 is provided between the lower side wall of the water outlet head 150 and the outer side wall of the cylinder body 100 to improve the strength of the cylinder structure.

[0073] In one embodiment, please refer to Figures 1 to 3 The cylinder structure further includes a cylinder sleeve 200 , and the cylinder sleeve 200 is sleeved in the cylinder body 100 through the inner cavity 110 .

[0074] like Figure 3 In the illustrated embodiment, a limiting flange is provided on the inner wall edge of the end of the inner cavity 110 of the cylinder body 100, and the limiting flange is arranged along the circumference of the inner cavity 110 to limit the upper end position of the cylinder liner 200, so that the cylinder body 100 and the cylinder liner 200 are assembled according to the preset position.

[0075] In one embodiment, please refer to Figures 1 to 3 The lower end of the cylinder body 100 and the lower end of the cylinder sleeve 200 are further extended downward to form a skirt 180.

[0076] In one embodiment, please refer to Figure 1 The cylinder body 100 is provided with a chain chamber 170 , and the chain chamber 170 is located at a side of the cooling chamber 120 , and there is a gap between the chain chamber 170 and the cooling chamber 120 .

[0077] Another embodiment provides a water-cooled engine, comprising the cylinder structure as described in any of the above embodiments.

[0078] The water-cooled engine adopts the aforementioned cylinder structure. Since the bottom groove 130 is opened on the bottom wall of the cooling chamber 120, and the bottom of the bottom groove 130 is lower than the bottom of the cooling chamber 120, the cooling water and impurities in the cooling chamber 120 can converge into the bottom groove 130, and then be discharged through the water outlet 151 communicated with the bottom groove 130, so that the cooling water and impurities in the cooling chamber 120 are completely discharged, avoiding a series of problems such as difficulty in controlling the amount of cooling water added and radiator blockage caused by the difficulty in completely discharging the cooling water and impurities, thereby improving the cooling effect.

[0079] Yet another embodiment provides a motorcycle comprising the water-cooled engine as described in the above embodiment.

[0080] The motorcycle adopts the aforementioned water-cooled engine. Since a bottom groove 130 is provided in the cylinder structure, and the bottom groove 130 is opened on the bottom wall of the cooling chamber 120, the bottom of the bottom groove 130 is lower than the bottom of the cooling chamber 120, so that the cooling water and impurities in the cooling chamber 120 can converge into the bottom groove 130, and then be discharged through the water outlet 151 communicated with the bottom groove 130, so that the cooling water and impurities in the cooling chamber 120 are completely discharged, avoiding a series of problems such as difficulty in controlling the amount of cooling water added and radiator blockage caused by the difficulty in completely discharging the cooling water and impurities, thereby improving the cooling effect of the engine and ensuring power output.

[0081] 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 orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0082] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, 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 "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0083] 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 connection; it can be a mechanical connection or an electrical connection; 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.

[0084] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0085] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0086] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A cylinder structure, characterized in that: include: A cylinder body, wherein the cylinder body has an inner cavity and a cooling cavity, wherein both the inner cavity and the cooling cavity are extended along the length direction of the cylinder body, the inner cavity is used to install the cylinder sleeve, and the cooling cavity is arranged in an annular shape on the cylinder body and is located on the outer periphery of the inner cavity; The cylinder body is further provided with a bottom groove and a water outlet, wherein the bottom groove is provided on the bottom wall of the cooling cavity, the bottom of the bottom groove is lower than the bottom of the cooling cavity, and the water outlet is communicated with the bottom groove; wherein the bottom groove is provided on the bottom wall corresponding to the lowest position of the cooling cavity; the bottom groove is a groove hole extending along the length direction of the cylinder body; or the bottom groove is an arc groove provided around the outer circumference of the cylinder body, and the arc groove extends along the length direction of the cylinder body; The cylinder body is also provided with a water inlet hole, which is opened on the side of the cylinder body and communicates with the cooling cavity; The water inlet and the water outlet are both opened on the exhaust side of the cylinder body, so that the cooling water just entering first flows through the exhaust side of the cylinder body, and at the same time, the cooling water also passes through the exhaust side of the cylinder body when being discharged, thereby increasing the cooling time of the exhaust side; the opening position of the water outlet is lower than the opening position of the water inlet; The cooling cavity is a circular cavity, and the hole axis of the water inlet hole is tangent to the cavity wall contour of the cooling cavity, so that the cooling water entering the cooling cavity through the water inlet hole can enter tangentially along the cavity wall of the cooling cavity; The cylinder body is also provided with a water inlet end, which is protruded toward the outside of the cylinder body, and the water inlet hole is opened on the water inlet end and extends along the protruding direction of the water inlet end; the cylinder body is also provided with a water outlet end, which is protruded toward the outside of the cylinder body, and the water outlet hole is opened on the water outlet end and extends along the protruding direction of the water outlet end; the cylinder body is also provided with a reinforcing rib, and the reinforcing rib is connected between the side wall of the water outlet end and the side wall of the cylinder body.

2. The cylinder structure according to claim 1, characterized in that: The hole axis of the water inlet hole is arranged at an angle with the hole axis of the water outlet hole.

3. A water-cooled engine, characterized in that: It comprises the cylinder structure as described in any one of claims 1 to 2.

4. A motorcycle, characterized in that: Comprising the water-cooled engine as claimed in claim 3.

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