A crankcase

Abstract

The application discloses a crankcase, which comprises a crankcase body and a cylinder body. The cylinder body is formed on one side of the crankcase body and communicates with the crankcase body. A push rod chamber is formed on the top of the cylinder body. The push rod chamber comprises a reinforcing part, a first push rod chamber and a second push rod chamber which are formed by the reinforcing part. An oil return cavity and an oil return hole are formed in the first push rod chamber and the second push rod chamber, and a double oil return hole structure is formed. The application has the beneficial effect that the push rod chamber is divided into the first push rod chamber and the second push rod chamber by the reinforcing part, the original single chamber is divided into double chambers, the strength and rigidity of the push rod chamber are improved, deformation after long-term use is avoided, the service life of the crankcase is ensured, and the reinforcing part increases the heat dissipation area to transfer part of the heat generated by the piston in the cylinder body, thereby preventing the push rod chamber from deforming.

Description

TECHNICAL FIELD

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

[0002] The crankcase is also called engine shell, which is the carrier of all parts of the engine. The main function of the crankcase is to carry the crankshaft, camshaft and piston and other components for high-speed operation. When the engine starts, the flywheel rotates at high speed, driving the crankshaft to rotate, which in turn drives the camshaft to move. The power of the camshaft is transmitted to the push rod, which controls the closing and opening of the intake and exhaust valves.

[0003] At present, the cylinder body outside of the crankcase is provided with a push rod chamber. The push rod chamber structure adopts a single cavity structure with a large cavity. The heat generated during the long-term operation of the piston in the cylinder body deforms the push rod chamber of the single cavity structure, resulting in the scrapping of the entire crankcase. SUMMARY

[0004] The purpose of the present application is to provide a crankcase that avoids deformation of the push rod chamber after long-term use.

[0005] To achieve this purpose, the present application adopts the following technical solutions.

[0006] A crankcase, comprising a crankcase body and a cylinder body, the cylinder body being formed on one side of the crankcase body and communicating with the crankcase body, a push rod chamber being formed at the top of the cylinder body, the push rod chamber comprising a reinforcing portion, and a first push rod chamber and a second push rod chamber being formed by the reinforcing portion, an oil return cavity and an oil return hole being formed in the first push rod chamber and the second push rod chamber, and a double oil return hole structure being formed.

[0007] The present application adopts the foregoing technical solutions. By setting the reinforcing portion to divide the push rod chamber into the first push rod chamber and the second push rod chamber, the original single cavity is divided into double cavities, the strength and rigidity of the push rod chamber are improved, deformation after long-term use is avoided, the service life of the crankcase is ensured, and the reinforcing portion increases the heat dissipation area to transfer part of the heat generated by the piston in the cylinder body, preventing deformation of the push rod chamber. An oil return cavity and an oil return hole are provided in the first push rod chamber and the second push rod chamber, the oil return effect is increased by the double oil return holes, and the oil consumption per unit time is reduced.

[0008] Preferably, the bottom of the first push rod chamber and the second push rod chamber is formed with a tappet hole, the tappet hole is used to install a tappet, and the tappet cooperates with the convex of the camshaft.

[0009] By providing a tappet hole in the push rod chamber, the tappet hole is used to install a tappet, and the tappet cooperates with the convex of the camshaft to transmit force.

[0010] Preferably, the bottom of the first push rod chamber and the second push rod chamber is concave-convex deformed to form a rectangular recess, and the recess forms an oil return cavity.

[0011] In this way, by concave-convex deforming the bottom of the first push rod chamber and the second push rod chamber to form the oil return cavity, the oil storage function is realized on the basis of improving the bottom strength, so that the oil taken out by the push rod can enter the oil storage cavity.

[0012] Preferably, the oil return hole is located at one end of the bottom of the oil return cavity, and the oil return hole is a through hole with a diameter of 2mm-2.5mm.

[0013] By providing the oil return hole with a diameter of 2mm-2.5mm at the bottom of the oil return cavity, the oil return effect is improved without affecting the operation of the combustion chamber.

[0014] Preferably, the reinforcing part is in the shape of a rectangle as a whole, and the width of the reinforcing part is 5.5mm-6mm.

[0015] By setting the reinforcing part to be a rectangle with a width of 5.5mm-6mm, the volume of the original push rod chamber is reduced, the heat dissipation area is increased by the reinforcing part, the deformation of the push rod chamber is avoided, and the strength and rigidity of the push rod chamber are improved.

[0016] Preferably, a crankshaft hole is formed in the crankcase body, and an oil baffle is formed on the side wall of the crankcase body, the oil baffle is close to the piston hole of the cylinder body, and the free end of the oil baffle extends to the crankshaft hole.

[0017] By providing the oil baffle on the side wall of the crankcase body and making the oil baffle close to the piston hole of the cylinder body, the oil taken out by the piston can be blocked by the oil baffle and dripped on the crankshaft along the free end of the oil baffle, thereby lubricating the crankshaft and the connecting rod and improving the service life of the crankshaft and the connecting rod.

[0018] Preferably, the oil baffle is in the shape of a rectangle as a whole, and the length of the oil baffle is greater than the piston hole.

[0019] By making the length of the oil baffle greater than the piston hole, the oil taken out by one side of the piston can be completely blocked on the crankshaft, thereby improving the lubrication effect of the crankshaft and the connecting rod.

[0020] Preferably, a fixing base is formed on the crankcase body, and reinforcing ribs are uniformly distributed on the fixing base.

[0021] By providing the fixing base to install the crankcase body and providing the reinforcing ribs, the strength and rigidity of the fixing base are improved.

[0022] Preferably, the outer side of the cylinder body is formed with uniformly distributed cooling fins.

[0023] By installing heat sinks, the heat of the cylinder block is reduced, thus preventing cylinder block deformation.

[0024] The beneficial effects of this invention are as follows: by setting a reinforcing section to evenly divide the pushrod chamber into a first pushrod chamber and a second pushrod chamber, the original single chamber is divided into a double chamber, improving the strength and rigidity of the pushrod chamber, preventing deformation after long-term use, and ensuring the service life of the crankcase. Furthermore, the reinforcing section increases the heat dissipation area to transfer some of the heat generated by the piston located in the cylinder, preventing deformation of the pushrod chamber. Additionally, oil return chambers and oil return holes are provided in both the first and second pushrod chambers. The double oil return holes increase the oil return effect and reduce oil consumption per unit time. By setting an oil baffle on the side wall of the crankcase body, and placing the oil baffle close to the piston hole in the cylinder, the oil carried out by the piston is easily blocked by the oil baffle and drips onto the crankshaft along the free end of the oil baffle, thereby lubricating the crankshaft and extending its service life. Attached Figure Description

[0025] Figure 1 This is a structural diagram of the present invention;

[0026] Figure 2 This is a perspective view of the present invention;

[0027] Figure 3 This is the present invention. Figure 1 Enlarged view of part K. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings, but this does not limit the invention to the scope of the embodiments described.

[0029] The reference numerals in the accompanying drawings of this invention include: crankcase body 1, cylinder block 2, crankshaft hole 3, fixed base 4, reinforcing rib 41, heat sink 21, oil baffle 31, cylinder block 5, first push rod chamber 61, second push rod chamber 62, tappet hole 63, oil return chamber 64, oil return hole 65, and reinforcing part 66.

[0030] See Figure 1 and Figure 3 A crankcase includes a crankcase body 1 and a cylinder block 2. The cylinder block 2 is formed on one side of the crankcase body and communicates with the crankcase body 1. A pushrod chamber is formed on the top of the cylinder block 2. The pushrod chamber includes a reinforcing part 66 and a first pushrod chamber 61 and a second pushrod chamber 62 formed equally by the reinforcing part 66. Both the first pushrod chamber 61 and the second pushrod chamber 62 have oil return chambers 64 and oil return holes 65, forming a double oil return hole 65 structure.

[0031] See Figure 3The bottom of the first push rod chamber 61 and the second push rod chamber 62 is formed with a tappet hole 63 for installing a tappet which cooperates with the convex of the camshaft.

[0032] Referring to Figure 1 and Figure 3 The bottom of the first push rod chamber 61 and the second push rod chamber 62 is concave-convex deformed to form a rectangular concave cavity, which forms an oil return cavity 64 located on one side corresponding to the tappet hole 63.

[0033] Referring to Figure 1 and Figure 3 The oil return hole 65 is located at one end of the bottom of the oil return cavity 64, and the oil return hole 65 is a through hole with a diameter of 2mm-2.5mm.

[0034] Referring to Figure 1 and Figure 3 The reinforcing part 66 is rectangular as a whole, and the width of the reinforcing part 66 is 5.5mm-6mm.

[0035] Referring to Figure 1 The crankcase body 1 is formed with a crank hole 3, and the side wall of the crankcase body 1 is formed with an oil baffle 31 which is close to the piston hole of the cylinder body 2 and whose free end extends to the crank hole 3.

[0036] Referring to Figure 1 and Figure 3 The oil baffle 31 is rectangular as a whole, and the length of the oil baffle 31 is greater than the piston hole.

[0037] Referring to Figure 2 The crankcase body 1 is formed with a fixing base 4, and the fixing base is formed with reinforcing ribs 41 which are uniformly distributed.

[0038] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A crankcase, characterized by The application relates to a crankcase body (1) and a cylinder body (2) formed on one side of the crankcase body (1) and communicating with the crankcase body (1), the top of the cylinder body (2) is provided with a push rod chamber, the push rod chamber comprises a reinforcing part (66), a first push rod chamber (61) and a second push rod chamber (62) formed by the reinforcing part (66), the first push rod chamber (61) and the second push rod chamber (62) are provided with an oil return cavity (64) and an oil return hole (65), and a double oil return hole (65) structure is formed. The bottom of the first push rod chamber (61) and the second push rod chamber (62) is concave-convexly deformed to form a rectangular concave cavity, the concave cavity forms the oil return cavity (64), and the oil return cavity (64) is located on one side of the corresponding tappet hole (63). The crankcase body (1) is provided with a crank hole (3), the crankcase body (1) is provided with an oil baffle (31) on the side wall, the oil baffle (31) is close to the piston hole of the cylinder body (2), and the free end of the oil baffle (31) extends to the crank hole (3).

2. The crankcase according to claim 1, characterized in that The bottom of the first push rod chamber (61) and the second push rod chamber (62) is provided with a tappet hole (63) for mounting a tappet.

3. The crankcase according to claim 1, characterized in that The oil return hole (65) is located at one end of the bottom of the oil return cavity (64), and the oil return hole (65) is a through hole with a diameter of 2mm-2.5mm.

4. The crankcase as defined in claim 1, characterized in that The reinforcing part (66) is in the shape of a rectangle as a whole, and the width of the reinforcing part (66) is 5.5mm-6mm.

5. The crankcase as defined in claim 1, characterized in that The oil baffle (31) is in the shape of a rectangular plate as a whole, and the length of the oil baffle (31) is greater than that of the piston hole.

6. The crankcase as defined in claim 1, characterized in that The crankcase body (1) is provided with a fixing base (4), and the fixing base is provided with uniformly distributed reinforcing ribs (41).

7. The crankcase as defined in claim 1, characterized in that The outer side of the cylinder body (2) is provided with uniformly distributed cooling fins (21).

Images