A skeleton construction crankcase

Abstract

The application discloses a framework structure crankcase and belongs to the field of engines. Left connecting rods (3) and right connecting rods (4) are oppositely arranged in an outer shell (7), and two ends of the connecting rods are respectively detachably connected with front support plates (1) and rear support plates (2). Two ends of the front support plates (1) and the rear support plates (2) are respectively detachably connected with left cylinder cover bottom plates (5) and right cylinder cover bottom plates (6). The left cylinder cover bottom plates (5) and the right cylinder cover bottom plates (6) are fixedly installed on the outer shell (7), and two ends of the outer shell (7) are respectively detachably connected with front end covers (8) and rear end covers (9). The crankcase adopts a framework structure and is assembled by parts, and therefore, die casting is not needed, the production process is simplified, and maintenance, disassembly and expansion of functions are facilitated.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of engine, in particular to a skeleton structure crankcase. BACKGROUND

[0002] The crankcase is an important component of the internal combustion engine, located below the engine, which carries the crankshaft, connecting rod, main bearing and other related parts, and provides the necessary sealing, lubrication and cooling functions. At present, the crankcase is usually open die cast, but this manufacturing process has some problems:

[0003] 1. The casting process needs to open the mold, melt and pressure cast, etc. multiple processes, resulting in high production cost, the cast crankcase is usually heavy, and may have defects or flaws, such as porosity, slag inclusion, inclusions, etc. These defects may cause the strength and sealing performance of the crankcase to decrease, and even cause fracture or leakage under high load and high temperature conditions.

[0004] 2. The crankshaft, connecting rod and other parts in the crankcase will produce friction and wear during work, so the crankcase is provided with a lubrication system to provide oil circulation and lubrication. When the cast crankcase has oil passage blockage and poor circulation, it is not convenient to dredge.

[0005] 3. Cannot replace the worn parts alone, resulting in high maintenance cost, and cannot expand the function of the crankcase. SUMMARY

[0006] The purpose of the present application is to provide a skeleton structure crankcase to solve the problems raised in the background art.

[0007] The technical scheme of the present application is: comprising a front support plate 1, a rear support plate 2, a left connecting rod 3, a right connecting rod 4, a left cylinder head bottom plate 5, a right cylinder head bottom plate 6, an outer shell 7, a front end cover 8 and a rear end cover 9, the left connecting rod 3 and the right connecting rod 4 are oppositely arranged in the outer shell 7, and the two ends are respectively connected with the front support plate 1 and the rear support plate 2 in a detachable manner, the front support plate 1 and the rear support plate 2 are respectively connected with the left cylinder head bottom plate 5 and the right cylinder head bottom plate 6 in a detachable manner, the left cylinder head bottom plate 5 and the right cylinder head bottom plate 6 are fixedly installed on the outer shell 7, and the outer shell 7 is respectively connected with the front end cover 8 and the rear end cover 9 in a detachable manner.

[0008] As a further scheme of the present application: the front end cover 8 and the front support plate 1 are both provided with an oil pump bearing hole 12 for installing an oil pump, a first oil passage is formed in the front support plate 1, the first oil passage includes an oil inlet hole 14 formed on the front surface of the front support plate 1 and two first oil passage outlets 17 formed on the back surface of the front support plate 1, and the oil inlet hole 14 is connected with the oil outlet of the oil pump.

[0009] As a further scheme of the present application: the left connecting rod 3 is a T-shaped structure, a second oil passage of T-shaped structure is arranged inside, including a second oil passage inlet 32 arranged at one end of the head of the left connecting rod 3, a second oil passage outlet 34 arranged at the tail end of the left connecting rod 3, and two left oil injection nozzles 31 arranged on the surface of the head of the left connecting rod 3, the second oil passage inlet 32 is connected with the first oil passage outlet 17.

[0010] As a further scheme of the present application: the right connecting rod 4 is a T-shaped structure, a third oil passage of T-shaped structure is arranged inside, including a third oil passage inlet 42 arranged at one end of the head of the right connecting rod 4, a third oil passage outlet 43 arranged at the tail end of the right connecting rod 4, and a right oil injection nozzle 41 arranged on the surface of the head of the right connecting rod 4, the third oil passage inlet 42 is connected with the first oil passage outlet 17.

[0011] As a further scheme of the present application: the tail of the left connecting rod 3 is provided with reinforcing ribs, the other ends of the reinforcing ribs are respectively connected to the two ends of the head of the left connecting rod 3, and a weight-reducing hole 18 is formed between the left connecting rod 3 and the reinforcing ribs.

[0012] As a further scheme of the present application: the tail of the right connecting rod 4 is provided with reinforcing ribs, the other ends of the reinforcing ribs are respectively connected to the two ends of the head of the right connecting rod 4, and a weight-reducing hole 18 is formed between the right connecting rod 4 and the reinforcing ribs.

[0013] As a further scheme of the present application: the front support plate 1 and the rear support plate 2 are respectively provided with a camshaft bearing hole 11 for mounting a camshaft, a crankshaft bearing hole 13 for mounting a crankshaft, and a connecting rod assembly hole 15 for mounting the left connecting rod 3 and the right connecting rod 4 on the front surface, and the two end sides are respectively provided with a cylinder head bottom plate assembly hole 16 for mounting the left cylinder head bottom plate 5 and the right cylinder head bottom plate 6.

[0014] As a further scheme of the present application: the two ends of the head of the left connecting rod 3 and the right connecting rod 4 are respectively provided with a support plate assembly hole 33 for respectively assembling the front support plate 1 and the rear support plate 2.

[0015] As a further scheme of the present application: the left cylinder head bottom plate 5 and the right cylinder head bottom plate 6 are provided with a support plate assembly hole 52 for assembling the front support plate 1 and the rear support plate 2 on the front surface, and a tappet guide pipe limiting hole 51 for assembling a tappet.

[0016] As a further scheme of the present application: the two ends of the housing 7 are provided with an end cover assembly hole 10 for assembling the front end cover 8 and the rear end cover 9.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] 1. The various dispersion-processed components are fixedly connected to form a skeleton structure, which greatly reduces the weight compared with a cast crankcase, forming a lightweight crankcase. The manufacturing process is simplified, and mold casting is eliminated. All components can be machined, reducing production costs.

[0019] 2. The lubricating oil passage in the crankcase is spliced by the oil channels of each component, which is convenient for processing compared with overall casting, and when the oil channel is blocked, it is also convenient to disassemble and dredge.

[0020] 3. When wear occurs, the failed components can be replaced according to the wear condition, facilitating maintenance. The function of the crankcase can also be expanded by replacing the components. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the present application;

[0022] Figure 2 is a structural schematic diagram of the internal structure of the present application;

[0023] Figure 3 is a structural schematic diagram of the front support plate (I);

[0024] Figure 4 is a structural schematic diagram of the front support plate (II);

[0025] Figure 5 is a structural schematic diagram of the rear support plate (I);

[0026] Figure 6 is a structural schematic diagram of the rear support plate (II);

[0027] Figure 7 is a structural schematic diagram of the left connecting rod;

[0028] Figure 8 is a structural schematic diagram of the right connecting rod;

[0029] Figure 9 is a structural schematic diagram of the cylinder head bottom plate (I);

[0030] Figure 10 is a structural schematic diagram of the cylinder head bottom plate (II);

[0031] Figure 11 is a structural schematic diagram of the front end cover;

[0032] Figure 12 is an oil passage schematic diagram;

[0033] Figure 13 is a structural schematic diagram of the outer shell.

[0034] In the figure: 1 - front support plate; 11 - camshaft bearing hole; 12 - oil pump bearing hole; 13 - crankshaft bearing hole; 14 - oil pump oil hole; 15 - connecting rod assembly hole; 16 - cylinder head bottom plate assembly hole; 17 - first oil passage outlet; 18 - tappet positioning hole; 2 - rear support plate; 3 - left connecting rod; 31 - left fuel nozzle; 32 - second oil passage inlet; 33 - support plate assembly hole; 34 - second oil passage outlet; 4 - right connecting rod; 41 - right fuel nozzle; 42 - third oil passage inlet; 43 - third oil passage outlet; 5 - left cylinder head bottom plate; 51 - tappet guide pipe limiting hole; 52 - support plate assembly hole; 6 - right cylinder head bottom plate; 7 - shell; 8 - front end cover; 9 - rear end cover; 10 - end cover assembly hole. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and are not used to limit the present application, that is, the described examples are only a part of the examples of the present application, but not all the examples. The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Therefore, the detailed description of the embodiments of the present application provided in the drawings below is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0037] Please refer to Figure 1 , Figure 2As shown in the embodiment of the present invention, a crankcase with a skeleton structure includes a left connecting rod 3 and a right connecting rod 4 disposed opposite to each other within a housing 7. Both ends of the left connecting rod 3 are detachably connected to a front support plate 1 and a rear support plate 2, respectively. The two ends of the front support plate 1 and the rear support plate 2 are also detachably connected to a left cylinder head base plate 5 and a right cylinder head base plate 6, respectively. The left cylinder head base plate 5 and the right cylinder head base plate 6 are fixedly mounted on the housing 7. Both ends of the housing 7 are detachably connected to a front cover 8 and a rear cover 9, respectively. The front support plate 1, rear support plate 2, left connecting rod 3, right connecting rod 4, left cylinder head base plate 5, right cylinder head base plate 6, housing 7, front cover 8, and rear cover 9 are all independent components that can be machined individually, simplifying the manufacturing process. The crankcase assembled from these components is half the weight of a cast crankcase of the same volume and strength, achieving a lightweight design that is of great significance for energy conservation and emission reduction. The front support plate 1 and rear support plate 2 support the crankshaft. They are connected by a left connecting rod 3 and a right connecting rod 4, which limits the relative displacement between them and disperses and absorbs some vibration energy, thus reducing vibration transmission. The front support plates 1 and 2 are supported on both sides by the left cylinder head base plate 5 and the right cylinder head base plate 6, which are mounted on the housing. These base plates provide additional support, reducing the deflection and deformation of the front and rear support plates 1 and 2, thereby enhancing the overall rigidity and stability of the structure. This helps to evenly distribute the stress, reducing local stress concentration, improving the load-bearing capacity and durability of the entire system, and also mitigates the vibration of the front and rear support plates 1 and 2. This allows the housing 7 to be made of plastic, further reducing the weight and manufacturing cost of the crankcase.

[0038] Furthermore, oil passages are provided in the front support plate 1, left connecting rod 3, and right connecting rod 4. When the left connecting rod 3 and right connecting rod 4 are assembled onto the front support plate 1, the support plate 1 can be connected to the oil passages in the left connecting rod 3 and right connecting rod 4 respectively (see [link]). Figure 12 (As shown) to achieve crankshaft lubrication.

[0039] Specifically, please refer to Figure 7 As shown, the left connecting rod 3 has a T-shaped structure and a second oil passage with a T-shaped structure inside. It includes a second oil passage inlet 32 ​​at one end of the head of the left connecting rod 3, a second oil passage outlet 34 at the tail end of the left connecting rod 3, and two left oil nozzles 31 on the surface of the head of the left connecting rod 3. The left oil nozzles 31 are arranged facing the crankshaft and at an angle to the crankshaft to ensure the lubrication effect.

[0040] Please see Figure 8As shown, the right connecting rod 4 is T-shaped structure, and a third oil passage in T-shaped structure is arranged inside, including a third oil passage inlet 42 arranged at one end of the head of the right connecting rod 4, a third oil passage outlet 43 arranged at the tail end of the right connecting rod 4, and a right oil nozzle 41 arranged on the surface of the head of the right connecting rod 4, which is arranged towards the crankshaft and forms an angle with the crankshaft to ensure the lubrication effect, and the right oil nozzle 41 keeps a relative distance with the left oil nozzle 31.

[0041] The driving gear of the oil pump is engaged with the driving gear on the camshaft. When the engine is running, the driving gear of the oil pump is rotated by the crankshaft, and the driven gear is reversely rotated to transport the lubricating oil along the gap and the pump wall through the oil inlet cavity to the oil outlet cavity, and then the lubricating oil is pumped into the first oil passage in the front support plate 1 through the oil hole 14 connected with the oil outlet of the oil pump, and then the lubricating oil is distributed to the second oil passage in the left connecting rod 3 and the third oil passage in the right connecting rod 4 through the first oil passage outlet 17, and then the lubricating oil is sent out of the crankcase to lubricate other components through the second oil passage outlet 34 and the third oil passage outlet 43, and the crankshaft is lubricated through the left oil nozzle 31 and the right oil nozzle 41. The lubrication of the crankcase is realized through the first oil passage, the second oil passage and the third oil passage, and the oil passage is processed in sections, which is convenient for processing, and the length of the oil passage is shortened compared with the crankcase formed by casting.

[0042] Further, please refer to Figure 11 、 Figure 3 、 Figure 4 As shown, the front end cover 8 and the front support plate 1 are both provided with an oil pump bearing hole 12 for installing an oil pump, and a ball bearing is arranged in the oil pump bearing hole 12, and the oil pump is installed on the ball bearing to reduce the friction loss between the oil pump shaft and the front support plate 1. The oil pump also includes an oil filter and an oil suction pipe to prevent metal chips in the oil stored in the crankcase from entering the lubricating oil circuit. Please refer to Figure 3 As shown, the front support plate 1 is provided with a connecting rod assembly hole 15 on the front surface for installing the left connecting rod 3 and the right connecting rod 4, and correspondingly, the left connecting rod 3 and the right connecting rod 4 are each provided with a support plate assembly hole 33 at both ends of the head for respectively assembling the front support plate 1 and the rear support plate 2. The connection between the front support plate 1 and the left connecting rod 3 and the right connecting rod 4 is positioned by using a positioning pin sleeve, that is, the positioning pin sleeve passes through the support plate assembly hole 33 and the connecting rod assembly hole 15, and is fastened by using an internal hexagonal bolt, and the internal hexagonal bolt can be matched with a countersunk hole to further utilize the space in the crankcase. The first oil passage is arranged in the front support plate 1, including an oil hole 14 arranged on the front surface of the front support plate 1 and two first oil passage outlets 17 arranged on the back surface of the front support plate 1, the oil hole 14 is connected with the oil outlet of the oil pump, and the two first oil passage outlets 17 are respectively connected with the second oil passage inlet 32 and the third oil passage inlet 42.

[0043] Further, please refer to Figures 3-6As shown, the front support plate 1 and the rear support plate 2 are respectively provided with camshaft bearing holes 11 for mounting camshafts, crankshaft bearing holes 13 for mounting crankshafts, and cylinder head plate assembly holes 16 at both ends of the side surfaces of the front support plate 1 and the rear support plate 2 for mounting the left cylinder head plate 5 and the right cylinder head plate 6. Ball bearings are mounted in the camshaft bearing holes 11, the crankshaft bearing holes 13, and the cylinder head plate assembly holes 16, thereby reducing the cost compared with traditional cam bearing seats, crankshaft bearing shells, and bearing covers. It should be noted that, in order to further reduce the weight of the crankcase, the rear support plate 2 is provided with a weight reduction hole between the camshaft bearing hole 11 and the crankshaft bearing hole 13.

[0044] Further, as shown in Figure 9 , Figure 10 As shown, the left cylinder head plate 5 and the right cylinder head plate 6 have the same structure, the front surface of the left cylinder head plate 5 and the right cylinder head plate 6 is provided with a support plate assembly hole 52 for assembling with the front support plate 1 and the rear support plate 2, and a tappet guide pipe limiting hole 51 for assembling a tappet. The left cylinder head plate 5 and the right cylinder head plate 6 are connected with the left connecting rod 3 and the right connecting rod 4 using a positioning pin sleeve, that is, the positioning pin sleeve passes through the cylinder head plate assembly hole 16 and the support plate assembly hole 52, and is fastened by an internal hexagonal bolt. The internal hexagonal bolt can be matched with a countersunk hole to further utilize the space in the crankcase. Similarly, the right cylinder head plate 6 is connected with the left connecting rod 3 and the right connecting rod 4 using a positioning pin sleeve, that is, the positioning pin sleeve passes through the cylinder head plate assembly hole 16 and the support plate assembly hole 52, and is fastened by an internal hexagonal bolt. The internal hexagonal bolt can be matched with a countersunk hole to further utilize the space in the crankcase.

[0045] It should be noted that the left connecting rod 3 and the right connecting rod 4 are provided with weight reduction holes 18 at both sides of the connection between the head and the tail. The tappet is mounted in the tappet guide pipe limiting hole 51, and an oil-resistant rubber sleeve is arranged in the tappet guide pipe limiting hole 51 to seal the tappet.

[0046] Further, as shown in Figure 13 As shown, the housing 7 is provided with end cover assembly holes 10 at both ends for assembling the front end cover 8 and the rear end cover 9. The housing 7 is provided with cylinder head plate positioning steps on both sides for limiting and mounting the left cylinder head plate 5 and the right cylinder head plate 6, and O-rings are used to seal the sealing grooves at the connection positions of the left cylinder head plate 5, the right cylinder head plate 6, the front end cover 8, and the rear end cover 9. The housing 7 is a plastic housing, which can store lubricating oil inside, thereby replacing the oil pan design and simplifying the structure and process. The lubricating oil recycled from the housing enters the oil pump inlet channel.

[0047] The above merely illustrates and describes the structure of the present application, and those skilled in the art can make various modifications or supplements to the described specific embodiments or adopt similar ways to replace, as long as the modifications or supplements do not deviate from the structure of the present application or exceed the scope defined by the present claims, and should belong to the protection scope of the present application.

Claims

1. A skeletal construction crankcase, characterized in that, The application relates to a cylinder head assembly, which comprises a front support plate (1), a rear support plate (2), a left connecting rod (3), a right connecting rod (4), a left cylinder head bottom plate (5), a right cylinder head bottom plate (6), an outer shell (7), a front end cover (8) and a rear end cover (9), the left connecting rod (3) and the right connecting rod (4) are oppositely arranged in the outer shell (7), and the two ends of the left connecting rod (3) and the right connecting rod (4) are respectively detachably connected with the front support plate (1) and the rear support plate (2), the two ends of the front support plate (1) and the rear support plate (2) are respectively detachably connected with the left cylinder head bottom plate (5) and the right cylinder head bottom plate (6), the left cylinder head bottom plate (5) and the right cylinder head bottom plate (6) are fixedly installed on the outer shell (7), and the two ends of the outer shell (7) are respectively detachably connected with the front end cover (8) and the rear end cover (9).

2. A skeletal structure crankcase according to claim 1, characterized in that The front end cover (8) and the front support plate (1) are provided with oil pump bearing holes (12) for installing an oil pump, the front support plate (1) is provided with a first oil channel, and the first oil channel comprises an oil inlet hole (14) arranged on the front surface of the front support plate (1) and two first oil channel outlets (17) arranged on the back surface of the front support plate (1).

3. A skeletal structure crankcase according to claim 1, wherein The left connecting rod (3) is in T-shaped structure, and a second oil channel in T-shaped structure is arranged in the left connecting rod (3), the second oil channel comprises a second oil channel inlet (32) arranged at one end of the head of the left connecting rod (3), a second oil channel outlet (34) arranged at the tail end of the tail of the left connecting rod (3) and two left oil injection nozzles (31) arranged on the surface of the head of the left connecting rod (3).

4. A skeletal structure crankcase according to claim 1, wherein The right connecting rod (4) is in T-shaped structure, and a third oil channel in T-shaped structure is arranged in the right connecting rod (4), the third oil channel comprises a third oil channel inlet (42) arranged at one end of the head of the right connecting rod (4), a third oil channel outlet (43) arranged at the tail end of the tail of the right connecting rod (4) and a right oil injection nozzle (41) arranged on the surface of the head of the right connecting rod (4).

5. A skeletal structure crankcase according to claim 1, wherein The tail of the left connecting rod (3) is provided with reinforcing ribs, the other ends of the reinforcing ribs are respectively connected to the two ends of the head of the left connecting rod (3), and weight-reducing holes (18) are formed between the left connecting rod (3) and the reinforcing ribs.

6. A skeletal structure crankcase according to claim 1, wherein The tail of the right connecting rod (4) is provided with reinforcing ribs, the other ends of the reinforcing ribs are respectively connected to the two ends of the head of the right connecting rod (4), and weight-reducing holes (18) are formed between the right connecting rod (4) and the reinforcing ribs.

7. A skeletal structure crankcase according to claim 1, wherein The front surface of the front support plate (1) and the rear support plate (2) is respectively provided with a camshaft bearing hole (11) for installing a camshaft, a crankshaft bearing hole (13) for installing a crankshaft and a connecting rod assembly hole (15) for installing the left connecting rod (3) and the right connecting rod (4), and the side surface of the two ends of the front support plate (1) and the rear support plate (2) is respectively provided with a cylinder head bottom plate assembly hole (16) for installing the left cylinder head bottom plate (5) and the right cylinder head bottom plate (6).

8. A skeletal structure crankcase according to claim 1, wherein The two ends of the head of the left connecting rod (3) and the right connecting rod (4) are respectively provided with a support plate assembly hole (33) for respectively assembling the front support plate (1) and the rear support plate (2).

9. A skeletal structure crankcase according to claim 1, wherein The front surface of the left cylinder head bottom plate (5) and the right cylinder head bottom plate (6) is provided with a support plate assembly hole for assembling the front support plate (1) and the rear support plate (2) and a tappet guide pipe limiting hole (51) for assembling a tappet.

10. A skeletal structure crankcase according to claim 1, wherein The two ends of the outer shell (7) are provided with end cover assembly holes (10) for assembling the front end cover (8) and the rear end cover (9).

Images