Engine

Abstract

The utility model provides an engine which comprises a crankcase and a cylinder body, the crankcase comprises a crankcase body and an installation base located at the top of the crankcase body, the crankcase body comprises a crankcase wall, a crankshaft hole is formed in the crankcase wall, lower fixing lugs are arranged on the left side and the right side of the installation base respectively, and the cylinder body is fixed to the installation base. The left side and the right side of the cylinder body are each provided with an upper fixing lug, the upper fixing lugs and the lower fixing lugs are arranged in an up-down corresponding mode, the upper fixing lugs and the lower fixing lugs are arranged in the corresponding upper fixing lugs and lower fixing lugs in a penetrating mode through fixing bolts and are locked, and therefore the cylinder body and the crankcase are fixed. The upper fixing lugs are arranged on the two sides of the cylinder body, the lower fixing lugs are arranged on the two sides of the installation base, the cylinder body and the crankcase are fixed through the upper fixing lugs, the lower fixing lugs and the four fixing bolts, the connection stability is enhanced, meanwhile, the inclined ribs of the cylinder body, the first cooling fins and the second cooling fins form triangular structures, and therefore the heat dissipation efficiency is improved. Local compression resistance and tensile strength are enhanced, and the cylinder body and the crankcase can be better fastened.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an air-cooled engine. Background Art

[0002] In the prior art, small air-cooled engines have the characteristics of high rotational speed, strong explosion pressure, and air-cooled forced heat dissipation. Among them, the cylinder block process is die-cast aluminum, and the structural strength and local stress concentration have always been the difficulties to be overcome in the development of air-cooled engine projects. There are problems of excessive local stress and uneven stress, and the explosion pressure cannot be effectively transmitted evenly to the engine body base, resulting in weak tensile and compressive strengths of the engine body.

[0003] Therefore, it is necessary to provide one to overcome the defects existing in the above. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an engine.

[0005] According to one aspect of the utility model, an engine is provided, which is characterized in that it includes:

[0006] A crankcase, the crankcase includes a crankcase body and a mounting seat located at the top of the crankcase body. The crankcase body includes a box wall, and a crankshaft hole is provided on the box wall. Taking the axial direction of the crankshaft hole as the front-rear direction, taking the horizontal two sides in the radial direction of the crankshaft hole as the left-right direction, and the side where the box wall is located as the front side;

[0007] Lower fixing lugs are provided on both the left and right sides of the mounting seat;

[0008] A cylinder block, the cylinder block is fixed on the mounting seat. Upper fixing lugs are provided on both the left and right sides of the cylinder block, and the upper fixing lugs and the lower fixing lugs are arranged in an up-and-down corresponding manner. The cylinder block and the crankcase are fixed by passing fixing bolts through the corresponding upper fixing lugs and lower fixing lugs and tightening them.

[0009] Preferably, the mounting seat includes a mounting hole vertically penetrating, a tappet chamber located on the right side of the mounting hole, and a first support wall located on the left side of the mounting hole. The lower fixing lugs are provided on the outer sides of the tappet chamber and the first support wall;

[0010] The cylinder block includes a cylinder barrel, a second support wall located on the left side of the cylinder barrel, and a push rod chamber located on the right side of the cylinder barrel. The upper fixing lugs are respectively arranged on the outer sides of the second support wall and the push rod chamber.

[0011] Preferably, heat dissipation fins are provided on the outer surface of the circumferential side of the cylinder barrel, between the cylinder barrel and the second support wall, and between the cylinder barrel and the push rod chamber. A cylinder block diagonal rib is obliquely arranged between the second support wall and the cylinder barrel. The cylinder block diagonal rib is located between the heat dissipation fins adjacent up and down, and extends upward from the side where the second support wall is located to the side where the cylinder barrel is located. The cylinder block diagonal rib is located above the upper fixed bracket.

[0012] Preferably, the heat dissipation fins include a first heat dissipation fin with a height not higher than the upper end face of the upper fixed bracket and a second heat dissipation fin arranged above and adjacent to the first heat dissipation fin. The bottom end of the cylinder block diagonal rib is connected to both the first heat dissipation fin and the second support wall, and the top end of the cylinder block diagonal rib is connected to both the second heat dissipation fin and the cylinder barrel.

[0013] Preferably, the crankcase body includes side walls on the left and right sides of the box wall. A plurality of longitudinal reinforcing ribs and transverse reinforcing ribs perpendicular to the longitudinal reinforcing ribs are provided on the side walls. The middle part of the longitudinal reinforcing ribs is connected to the lower fixed bracket.

[0014] Preferably, heat dissipation fins are provided on the outer wall of the mounting hole, between the mounting hole and the first support wall, and between the mounting hole and the tappet chamber.

[0015] Preferably, a crankcase bolt hole and a crankcase positioning pin hole are provided on the top end face of the mounting seat around the mounting hole. An installation through hole is provided at the bottom of the cylinder barrel corresponding to the crankcase bolt hole, and a cylinder block positioning pin hole is provided at the bottom of the cylinder barrel corresponding to the crankcase positioning pin hole.

[0016] Preferably, the cylinder head is fixed to the top of the cylinder block. A cylinder head through hole corresponding to the installation through hole is provided on the cylinder head. First, insert a cylinder head bolt into the installation through hole and the crankcase bolt hole, then install the cylinder head, and sleeve the cylinder head through hole on the cylinder head bolt. By tightening the cylinder head nut at the top, the cylinder head is fixed to the crankcase.

[0017] Compared with the prior art, the engine provided by the present utility model has the following beneficial effects:

[0018] Due to the adoption of the above technical solution, the utility model has the advantages of simple structure, ingenious design and low cost. Upper fixed lugs are arranged on both sides of the cylinder block, and lower fixed lugs are arranged on both sides of the mounting seat. The cylinder block and the crankcase are fixed by the upper fixed lugs, the lower fixed lugs and 4 fixing bolts, strengthening the connection stability. At the same time, triangular structures are formed between the inclined ribs of the cylinder block and the first heat sink and the second heat sink, enhancing the local compressive and tensile strength and better fastening the cylinder block and the crankcase. During the operation of the engine, when the cylinder block is subjected to tensile and compressive forces, the inclined ribs of the cylinder block can better support the force on the cylinder block. The explosion tensile force of the cylinder block part can be transmitted to the upper fixed lug through the inclined ribs of the cylinder block, and then transmitted to the strengthening rib through the lower fixed lug, and dispersed to the crankcase by the strengthening rib, thereby enhancing the tensile and compressive strength of the whole machine. Brief Description of the Drawings

[0019] The following further details the utility model in conjunction with the drawings and specific embodiments:

[0020] Figure 1 is a three-dimensional view of the engine of the utility model;

[0021] Figure 2 is an exploded view of the engine of the utility model;

[0022] Figure 3 is a three-dimensional view of the crankcase of the utility model;

[0023] Figure 4 is a top view of the crankcase of the utility model;

[0024] Figure 5 is a three-dimensional view of the cylinder block of the utility model;

[0025] Figure 6 is a bottom view of the cylinder block of the utility model.

[0026] Wherein, 1. Crankcase, 11. Crankcase body, 111. Case wall, 1111. Crankshaft hole, 112. Side wall, 1121. Longitudinal strengthening rib, 1122.. Transverse strengthening rib, 12. Mounting seat, 121. Mounting hole, 122. First support wall, 123. Tappet chamber, 124. Lower fixed lug, 125. Top surface of the mounting seat, 126. Crankcase bolt hole, 127. Crankcase positioning pin hole, 2. Cylinder block, 21. Cylinder barrel, 22. Second support wall, 23. Push rod chamber, 24. Upper fixed lug, 25. Inclined rib of the cylinder block, 26. Mounting through hole, 27. Cylinder block positioning pin hole, 3. Cylinder head, 31. Cylinder head through hole, 4. Heat sink, 41. First heat sink, 42. Second heat sink, 5. Cylinder head bolt, 6. Fixing bolt. Specific Embodiments

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0028] To make the drawings concise, only the parts related to the present invention are schematically shown in each drawing, and they do not represent the actual structure of the product. Additionally, to make the drawings concise and easy to understand, for components with the same structure or function in some drawings, only one of them is schematically shown, or only one of them is labeled. In this article, "one" not only means "only this one", but also means "more than one" situation.

[0029] It should be further understood that the term "and / or" used in the description of this application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0030] In this article, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0031] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will describe the specific embodiments of the present invention with reference to the drawings. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other embodiments can be obtained.

[0033] See Figure 1 and Figure 2 , this embodiment discloses an engine, which is an air-cooled engine and includes a crankcase 1, a cylinder block 2, and a cylinder head 3. The cylinder block 2 is fixed to the top of the crankcase 1, and the cylinder head 3 is fixed to the top of the cylinder block 2. The crankcase 1, the cylinder block 2, and the cylinder head 3 are tightly fixed by 4 cylinder head bolts 5.

[0034] The crankcase 1 includes a crankcase body 11 and a mounting seat 12 located at the top of the crankcase body 11. The crankcase body 11 includes a case wall 111 and side walls 112 on both sides of the case wall 111. A crankshaft hole 1111 is formed in the case wall 111. Taking the axial direction of the crankshaft hole 1111 as the front-back direction, the horizontal two sides in the radial direction of the crankshaft hole 1111 as the left-right direction, the vertical direction in the radial direction of the crankshaft hole 1111 as the up-down direction, the side where the case wall 111 is located is the front side, and the opening side of the crankcase 1 is the rear side.

[0035] See Figure 3 and Figure 4 , since the upper surface of the crankcase 1 is the top surface 125 of the mounting seat, the upper surface of the crankcase 1 is arranged as a horizontal plane, that is, the top surface 125 of the mounting seat is arranged as a horizontal plane.

[0036] The mounting seat 12 includes a mounting hole 121 vertically penetrating through, a tappet chamber 123 located on the right side of the mounting hole 121, and a first support wall 122 located on the left side of the mounting hole 121. Heat dissipation fins 4 are provided between the outer wall of the mounting hole 121, between the mounting hole 121 and the first support wall 122, and between the mounting hole 121 and the tappet chamber 123. Lower fixing lugs 124 are provided on the outer sides of both the tappet chamber 123 and the first support wall 122.

[0037] See Figure 5 and Figure 6 , the cylinder block 2 is fixed on the mounting seat 12. The cylinder block 2 includes a cylinder barrel 21, a second support wall 22 located on the left side of the cylinder barrel 21, and a push rod chamber 23 located on the right side of the cylinder barrel 21. Heat dissipation fins 4 are provided between the outer surface on the circumferential side of the cylinder barrel 21, between the cylinder barrel 21 and the second support wall 22, and between the cylinder barrel 21 and the push rod chamber 23. Upper fixing lugs 24 are provided on the outer sides of both the second support wall 22 and the push rod chamber 23.

[0038] See Figure 1 and Figure 2 , the first support wall 122 is located directly above the second support wall 22, the mounting hole 121 is located directly above the cylinder barrel 21, the tappet chamber 123 is located above the push rod chamber 23 and communicates with each other. The upper fixing lugs 24 and the lower fixing lugs 124 are arranged corresponding to each other up and down. Through holes are formed in the upper fixing lugs 24, and threaded holes are provided in the lower fixing lugs 124. After the fixing bolt 6 passes through the upper fixing lugs 24, it is tightened in the corresponding lower fixing lugs 124, thereby fixing the cylinder block 2 and the crankcase 1. In other embodiments, through holes may be formed in both the upper fixing lugs 24 and the lower fixing lugs 124. After the fixing bolt 6 passes through the corresponding through holes in sequence, the upper fixing lugs 24 and the lower fixing lugs 124 are locked and fixed by a nut provided below the lower fixing lugs 124.

[0039] See Figure 5, an inclined cylinder block diagonal rib 25 is provided between the second support wall 22 and the cylinder barrel 21. The cylinder block diagonal rib 25 is located between adjacent upper and lower radiating fins 4, and extends upward from the side where the second support wall 22 is located to the side where the cylinder barrel 21 is located. The cylinder block diagonal rib 25 is located above the upper fixed lug 24. Further, the radiating fin 4 includes a first radiating fin 41 whose height is not higher than the upper end face of the upper fixed lug 24, and a second radiating fin 42 provided above the first radiating fin 41 and adjacent to the first radiating fin 41. The bottom end of the cylinder block diagonal rib 25 is connected to both the first radiating fin 41 and the second support wall 22, and the top end of the cylinder block diagonal rib 25 is connected to both the second radiating fin 42 and the cylinder barrel 21. The cylinder block diagonal rib 25 forms a triangular structure with both the first radiating fin 41 and the second radiating fin 42, enhancing the local compressive and tensile strength, and being able to better fasten the cylinder block 2 and the crankcase 1. During the operation of the engine, the cylinder block 2 is subjected to tensile and compressive forces, and the cylinder block diagonal rib can better support the force on the cylinder block 2.

[0040] See Figure 1 , a plurality of longitudinal reinforcing ribs 1121 and transverse reinforcing ribs 1122 perpendicular to the longitudinal reinforcing ribs 1121 are provided on the side wall 112. Some of the longitudinal reinforcing ribs 1121 are connected to the lower fixed lug 124. The arrangement of the reinforcing ribs can transfer force while strengthening the overall strength of the crankcase 1. The explosive tensile force of the cylinder block 2 part can be transmitted to the upper fixed lug 24 through the cylinder block diagonal rib 25, then transmitted to the reinforcing ribs through the lower fixed lug 124, and dispersed by the reinforcing ribs to the crankcase 1, thereby enhancing the tensile and compressive strength of the whole machine.

[0041] See Figure 4 , a crankcase bolt hole 126 and a crankcase positioning pin hole 127 are opened on the top end face 125 of the mounting seat around the mounting hole 121. A mounting through hole 26 is provided at the bottom of the cylinder barrel 21 corresponding to the crankcase bolt hole 126, and a cylinder block positioning pin hole 27 is provided at the bottom of the cylinder barrel 21 corresponding to the crankcase positioning pin hole 127. A cylinder head through hole 31 corresponding to the mounting through hole 26 is provided on the cylinder head 3. A positioning pin (not shown in the figure) is inserted into the crankcase positioning pin hole 127 and the cylinder block positioning pin hole 27. First, a cylinder head bolt 5 is inserted into the mounting through hole 26 and the crankcase bolt hole 126. The bottom of the cylinder head bolt 5 is connected and fixed to the crankcase 1, and then the cylinder head 3 is installed. The cylinder head through hole 31 is sleeved on the cylinder head bolt 5, and the cylinder head 3 is fixed to the crankcase 1 by tightening the cylinder head nut at the top.

[0042] It will be apparent to those skilled in the art that various modifications and variations can be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations of the present invention falling within the scope of the appended claims and their equivalent technical solutions.

Claims

1. An engine, characterized in that: include: A crankcase, the crankcase comprising a crankcase body and a mounting seat located on the top of the crankcase body, the crankcase body comprising a case wall, a crankshaft hole is provided on the case wall, the axial direction of the crankshaft hole is the front-to-back direction, the radial horizontal sides of the crankshaft hole are the left-to-right direction, and the side where the case wall is located is the front side; The left and right sides of the mounting seat are both provided with lower fixing brackets; The cylinder body is fixed on the mounting seat, and upper fixing brackets are provided on both sides of the cylinder body. The upper fixing brackets and the lower fixing brackets are arranged correspondingly up and down. Fixing bolts are passed through the corresponding upper fixing brackets and the lower fixing brackets and locked, so as to fix the cylinder body and the crankcase.

2. The engine according to claim 1, characterized in that The mounting seat includes a mounting hole vertically penetrating therethrough, a tappet chamber located on the right side of the mounting hole, and a first supporting wall located on the left side of the mounting hole, and the lower fixing bracket is arranged on the outer side of the tappet chamber and the outer side of the first supporting wall; The cylinder body comprises a cylinder barrel, a second supporting wall located on the left side of the cylinder barrel, and a push rod chamber located on the right side of the cylinder barrel, and the upper fixed bracket is respectively arranged on the outer side of the second supporting wall and the outer side of the push rod chamber.

3. The engine according to claim 2, characterized in that Heat sinks are provided on the circumferential outer surface of the cylinder, between the cylinder and the second supporting wall, and between the cylinder and the push rod chamber. Cylinder body oblique ribs are obliquely provided between the second supporting wall and the cylinder. The cylinder body oblique ribs are located between the upper and lower adjacent heat sinks and extend from the side where the second supporting wall is located to the side where the cylinder is located from bottom to top. The cylinder body oblique ribs are located above the upper fixed bracket.

4. The engine according to claim 3, characterized in that The heat sink includes a first heat sink whose height is not higher than the upper end surface of the upper fixed bracket and a second heat sink arranged above the first heat sink and adjacent to the first heat sink. The bottom end of the cylinder oblique rib is connected to the first heat sink and the second support wall at the same time, and the top end of the cylinder oblique rib is connected to the second heat sink and the cylinder barrel at the same time.

5. The engine according to claim 4, characterized in that The crankcase body comprises side walls located on the left and right sides of the case wall, the side walls are provided with a plurality of longitudinal reinforcing ribs and transverse reinforcing ribs arranged perpendicular to the longitudinal reinforcing ribs, and the middle part of the longitudinal reinforcing ribs is connected to the lower fixed bracket.

6. The engine according to claim 5, characterized in that Heat sinks are arranged on the outer wall of the mounting hole, between the mounting hole and the first supporting wall, and between the mounting hole and the tappet chamber.

7. The engine according to claim 6, characterized in that A crankcase bolt hole and a crankcase locating pin hole are provided on the top surface of the mounting seat around the mounting hole, a mounting through hole is provided at the bottom of the cylinder barrel corresponding to the crankcase bolt hole, and a cylinder body locating pin hole is provided at the bottom of the cylinder barrel corresponding to the crankcase locating pin hole.

8. The engine according to claim 7, characterized in that It also includes a cylinder head, which is fixed to the top of the cylinder body. The cylinder head is provided with a cylinder head through hole corresponding to the installation through hole. The cylinder head bolts are first inserted into the installation through hole and the crankcase bolt hole, and then the cylinder head is installed. The cylinder head through hole is sleeved on the cylinder head bolt, and the cylinder head is fixed to the crankcase by tightening the cylinder head nut on the top.

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