A general-purpose engine

Abstract

The utility model discloses a general engine, including the oil tank and the crankshaft box along the vertical distribution, the upper portion of crankshaft box is fixed with the mounting seat, be provided with the support part for supporting the oil tank on the mounting seat, be provided with the installation through -hole on the support part, be provided with the installation part that cooperates with the support part on the oil tank, the installation part is located the bottom of oil tank, the installation part is provided with the fixed link that cooperates with installation through -hole, be provided with the support surface that cooperates with installation part face on the support part, the distance of the outer edge of support surface to the edge of installation through -hole is greater than the hole diameter of installation through -hole 70%. The present scheme has solved the problem that the oil tank installation of prior art is easy to cause the volume increase of general engine and the oil tank is easy to break after high -strength use.

Description

Technical Field

[0001] This utility model relates to general-purpose engines. Background Technology

[0002] A general-purpose engine is a small combustion engine with strong versatility, used in fields other than automobiles and aviation. The components of a general-purpose engine typically include a crankcase, fuel tank, and cylinder block. The fuel tank is usually located above the crankcase and is connected and fixed to it via a mounting bracket, allowing the crankcase to support and secure the fuel tank. Existing fuel tanks are generally made of stamped and welded metal sheets, belonging to the thin-walled component category.

[0003] Chinese patent document CN201096047Y discloses a fuel tank mounting structure for general-purpose power machinery, including a crankshaft housing and a fuel tank. The structure is characterized by: a left mounting bracket and a right mounting bracket, the upper ends of which are connected to the fuel tank, and the lower ends of which are connected to the crankshaft housing. A mounting flange with a fuel tank connection hole is provided on the fuel tank, and the upper ends of the left and right mounting brackets are connected to the mounting flange through the fuel tank connection hole. The mounting flange is located in the middle of the fuel tank. The advantages of this prior art are: the use of a larger support and a smaller bracket allows for a single-layer structure for the lower body of the fuel tank, resulting in lower fuel tank costs; simultaneously, the smaller mounting bracket simplifies the structure and reduces manufacturing costs; it securely mounts the fuel tank to the crankshaft housing, preventing fuel tank movement and instability, and eliminating potential safety hazards.

[0004] However, the installation flange in the prior art increases the space occupied around the side of the fuel tank, thus increasing the overall installation space requirement of the general-purpose engine. Utility Model Content

[0005] The purpose of this invention is to provide a universal engine to solve the problem that the installation of the fuel tank in the prior art easily leads to an increase in the size of the universal engine.

[0006] To achieve the above objectives, the basic solution of this utility model provides a general-purpose engine, including a vertically distributed oil tank and crankcase. A mounting base is fixed to the upper part of the crankcase, and the mounting base has a support portion for supporting the oil tank. The support portion has a mounting through hole. The oil tank has a mounting portion that connects and mates with the support portion. The mounting portion is located at the bottom of the oil tank, and the mounting portion has a fixing rod that connects and mates with the mounting through hole. The support portion has a support surface that mates with the mounting portion surface. The distance from the outer edge of the support surface to the edge of the mounting through hole is greater than 70% of the diameter of the mounting through hole.

[0007] The beneficial effects of this basic design are as follows: The support surface of the support unit and the mounting unit provide surface-fit support, and the distance from the outer edge of the support surface to the edge of the mounting through hole is greater than 70% of the hole diameter. Furthermore, the fixing rod is connected and fixed to the mounting through hole on the support unit. This allows the support surface to effectively disperse the vibration stress on the fuel tank, thereby reducing the likelihood of fuel tank breakage. Compared to existing technologies, the fuel tank is connected to the mounting seat on the crankcase via a mounting part located at the bottom. The support surface effectively disperses vibration stress, eliminating the need for mounting flanges on the fuel tank as in existing technologies, thus avoiding the problem of increased installation space in general-purpose engines. Simultaneously, the fit between the bottom mounting part and the support surface of the support unit effectively disperses vibration stress, making the fuel tank less prone to breakage even under high-intensity use.

[0008] Preferably, support surfaces are distributed on at least two opposite sides of the mounting through hole. This arrangement increases the contact area between the support and the mounting part and makes the force on both sides of the mounting through hole more even and distributed, which helps to further improve the stability of the fuel tank installation.

[0009] Preferably, the support and the mounting base are integrally formed. This design not only enhances the strength of the support but also reduces assembly operations and improves production efficiency.

[0010] Preferably, the supporting surface is a plane, and the supporting surface is in contact with the plane of the mounting part. This arrangement, by fitting the planes together, reduces stress concentration between the supporting part and the mounting part, which helps to further improve the stability and durability of the fuel tank support installation.

[0011] Preferably, the fixing rod is inclined relative to the horizontal plane where the bottom of the fuel tank is located, and the cross-sectional area of ​​the mounting through hole at the end near the mounting part is larger than the cross-sectional area at the end away from the mounting part. With this arrangement, when the fuel tank is assembled, the fixing rod is inserted from the larger cross-sectional area end of the mounting through hole into the smaller cross-sectional area end, and finally positioned using the smaller cross-sectional area end of the mounting through hole, thereby facilitating the assembly and positioning operations of the fuel tank.

[0012] Preferably, the mounting through hole is an oblong hole, with its length extending along the vertical plane containing the axis of the fixing rod. With this design, during fuel tank assembly, the fixing rod moves along the length of the oblong hole (the larger end of the through hole's cross-section) while remaining almost constant along the width of the oblong hole. This allows the mounting through hole to provide positioning support for the fixing rod in a specific direction, further improving the stability of the fuel tank mounting support and reducing displacement of the fuel tank during engine vibration.

[0013] Preferably, the mounting base is integrally formed with the crankcase. This design enhances the overall integrity and reliability between the mounting base and the crankcase, reduces the use of connecting parts, and lowers assembly difficulty and cost.

[0014] Preferably, the mounting base is provided with reinforcing ribs along its extension direction. This arrangement, through the reinforcing ribs, improves the load-bearing capacity and deformation resistance of the mounting base without significantly increasing material usage, thereby ensuring the mounting base can stably support the fuel tank during engine operation and guaranteeing the stability of the fuel tank installation.

[0015] This utility model has the following beneficial effects: Compared with existing technologies, the fuel tank is connected to the mounting base on the crankcase via a mounting part located at the bottom. The support surface can effectively disperse vibration stress, thus eliminating the need for mounting flanges on the fuel tank as in existing technologies. This avoids increasing the installation space of the general-purpose engine and also reduces the risk of the fuel tank cracking under high-intensity use. The inclined setting of the fixing rod and the waist-shaped mounting through hole make the fuel tank assembly operation more convenient and the installation positioning more reliable, thereby improving the reliability of the fuel tank's installation support. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an embodiment of a general-purpose engine according to the present invention; Figure 2 for Figure 1 A schematic diagram showing the fit between the mounting bracket and the crankcase. Detailed Implementation

[0017] In this invention, the distance B from the outer edge of the support surface to the edge of the mounting through hole is greater than 70% of the hole diameter A of the mounting through hole. That is, the distance B can be 80%, 90%, 100%, 110%, etc. of the hole diameter A of the mounting through hole.

[0018] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: oil tank 1, mounting part 2, crankcase 3, support part 4, nut 5, fixing rod 6, mounting base 7, support surface 8, mounting through hole 9, and reinforcing rib 10.

[0019] The basic implementation examples are as follows: Figure 1 and Figure 2As shown: A general-purpose engine includes a fuel tank 1 and a crankcase 3 arranged vertically. A mounting base 7 is fixed to the upper part of the crankcase 3. The mounting base 7 has a support portion 4 for supporting the fuel tank 1, and the support portion 4 has a mounting through hole 9. In this embodiment, preferably, the mounting base 7 and the crankcase 3 are integrally formed; the support portion 4 and the mounting base 7 are also integrally formed. Reinforcing ribs 10 are provided on the mounting base 7 along its extending direction.

[0020] The fuel tank 1 is provided with a mounting part 2 that connects and mates with the support part 4. The mounting part 2 is located at the bottom of the fuel tank 1. The mounting part 2 is provided with a fixing rod 6 that connects and mates with the mounting through hole 9. In this embodiment, a nut 5 is threaded onto the fixing rod 6. The nut 5 is connected to the end of the fixing rod 6 that protrudes from the mounting through hole 9 and abuts against the support part 4, thereby achieving a secure connection between the mounting part 2 and the support part 4 by the fixing rod 6. The fixing rod 6 is inclined relative to the horizontal plane where the bottom of the fuel tank 1 is located. The cross-sectional area of ​​the mounting through hole 9 near the mounting part 2 is larger than the cross-sectional area of ​​the end away from the mounting part 2. In this embodiment, the mounting through hole 9 is preferably an oblong hole, and the length direction of the oblong hole extends along the vertical plane containing the axis of the fixing rod 6.

[0021] The support portion 4 is provided with a support surface 8 that mates with the mounting portion 2. The distance B from the outer edge of the support surface 8 to the edge of the mounting through hole 9 is greater than 70% of the diameter A of the mounting through hole 9. In this embodiment, it is preferable that the distance B from the outer edge of the support surface 8 to the edge of the mounting through hole 9 is slightly equal to the diameter A of the mounting through hole 9. Preferably, support surfaces 8 are distributed on at least two opposite sides of the mounting through hole 9. Specifically, the support surfaces 8 are distributed along the long side of the end of the mounting through hole 9 that has a larger cross-sectional area (elongated hole). More preferably, the support surfaces 8 are distributed along three sides of the mounting through hole 9, so that the overall outline of the support surface 8 is U-shaped. The support surface 8 is a plane and fits against the plane of the mounting portion 2.

[0022] In this design, the fuel tank 1 is connected to the mounting seat 7 on the crankcase 3 via the mounting part 2 located at the bottom. The support surface 8 effectively disperses vibration stress, eliminating the need for a mounting flange on the fuel tank 1 as in existing technologies. This avoids increasing the installation space of the general-purpose engine and also reduces the risk of the fuel tank cracking under high-intensity use. The inclined design of the fixing rod 6 and the oblong mounting hole 9 make the assembly of the fuel tank 1 more convenient and the installation positioning more reliable, thereby improving the installation support reliability of the fuel tank 1.

[0023] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics of the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A general-purpose engine, comprising a fuel tank and a crankcase arranged vertically, wherein a mounting base is fixedly provided on the upper part of the crankcase, the mounting base is provided with a support portion for supporting the fuel tank, and the support portion is provided with a mounting through hole; the fuel tank is provided with a mounting portion that connects and mates with the support portion, characterized in that: The mounting part is located at the bottom of the oil tank. The mounting part is provided with a fixing rod that connects and cooperates with the mounting through hole. The support part is provided with a support surface that cooperates with the mounting part surface. The distance from the outer edge of the support surface to the edge of the mounting through hole is greater than 70% of the diameter of the mounting through hole.

2. A general-purpose engine according to claim 1, characterized in that: The mounting through hole has support surfaces distributed on at least two opposite sides.

3. A general-purpose engine according to claim 2, characterized in that: The support and the mounting base are integrally formed.

4. A general-purpose engine according to claim 3, characterized in that: The supporting surface is a plane, and the supporting surface is in contact with the plane of the mounting part.

5. A general-purpose engine according to claim 4, characterized in that: The fixing rod is inclined relative to the horizontal plane where the bottom of the oil tank is located, and the cross-sectional area of ​​the end of the mounting hole near the mounting part is larger than the cross-sectional area of ​​the end away from the mounting part.

6. A general-purpose engine according to claim 5, characterized in that: The mounting through hole is an oblong hole, and the length of the oblong hole extends along the vertical plane containing the axis of the fixing rod.

7. A general-purpose engine according to claim 6, characterized in that: The mounting base is integrally formed with the crankcase.

8. A general-purpose engine according to claim 7, characterized in that: The mounting base is provided with reinforcing ribs along its extension direction.

Images