Oil return channel of engine cylinder block

Abstract

The utility model discloses an engine air cylinder body oil return channel which comprises an air cylinder cover, an oil pan and an air cylinder body, an air cylinder cover oil return cavity is formed in the air cylinder cover, the air cylinder body is provided with an air cylinder body oil return channel in butt joint with the air cylinder cover oil return cavity, the lower end of the air cylinder body oil return channel is connected with the oil pan, and the engine air cylinder body oil return channel further comprises an oil return guide pipe. The oil return guide pipe is used for replacing an air cylinder body oil return channel, the upper end of the oil return guide pipe is connected with the air cylinder cover oil return cavity, and the lower end of the oil return guide pipe is connected with the oil pan or the air cylinder body. The utility model has the advantages of light weight, low cost and the like, and is favorable for improving the casting qualification rate of the cylinder body.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an oil return channel of an engine cylinder body. Background Art

[0002] The cylinder block is a crucial component of the engine, responsible for supporting, protecting, and assembling the components. Diesel engine cylinder blocks are typically cast from high-quality gray cast iron, ductile iron, alloy cast iron, and other materials. The cylinder block serves as the foundation for the assembly of various engine mechanisms and systems, ensuring accurate positioning and connection between engine components.

[0003] During engine operation, the valve train, valve train, and other moving parts within the cylinder head are lubricated and cooled with sufficient oil. This prevents oil accumulation in the cylinder head, which can cause flooding or oil burning, and reduces engine oil consumption. The lubricated and cooled oil must be promptly returned to the engine oil pan. The cylinder head is secured to the cylinder block via bolts. This return oil is returned to the oil pan through oil return channels designed into the cylinder block. Because the cylinder head oil return relies on gravity, engines typically have independent return channels for each cylinder to ensure smooth oil return. Multi-cylinder engines may require multiple channels. These channels are typically designed to conform to the cylinder block's structural features, with the outer wall of the channel integrated into the cylinder block's external features. Due to the unique characteristics of the casting process, sand core casting is often used for these shaped oil return channels. Sand core castings require necessary support, sand cleaning, and exhaust ports, which increases the casting difficulty, reduces the quality rate, and ultimately increases production costs. The wall thickness of the cast iron oil return channel is generally 4 to 5 mm. The multiple oil return channels arranged in a multi-cylinder engine will increase the weight of the cylinder block and fail to achieve the goal of lightweighting the cylinder block.

[0004] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the present utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of this application. Utility Model Content

[0005] The utility model (mainly) aims to provide an engine cylinder oil return passage which is light in weight, low in cost and helps to improve the qualified rate of cylinder casting.

[0006] To this end, the utility model proposes an engine cylinder oil return passage.

[0007] Preferably, the present invention may also have the following technical features:

[0008] An engine cylinder block oil return channel includes a cylinder head, an oil pan and a cylinder block, wherein a cylinder head oil return chamber is provided inside the cylinder head, and the cylinder block is provided with a cylinder block oil return channel connected to the cylinder head oil return chamber. The lower end of the cylinder block oil return channel is connected to the oil pan, and the oil return conduit is used to replace the cylinder block oil return channel. The upper end of the oil return conduit is connected to the cylinder head oil return chamber, and the lower end is connected to the oil pan or the cylinder block.

[0009] Furthermore, the oil return conduit is made of aluminum alloy pipe material.

[0010] Furthermore, the oil return conduit is connected to the cylinder head in an interference fit manner.

[0011] Furthermore, at least one glue storage tank is provided at the upper end of the oil return conduit and at the sealing portion where it is connected to the cylinder head.

[0012] Furthermore, the glue storage tank is arranged along the outer side of the oil return conduit and is an annular groove.

[0013] Furthermore, there is a countersunk hole on the lower side of the cylinder head, and the top of the countersunk hole is connected to the cylinder head oil return chamber; the outer side of the upper end of the oil return conduit is interference fit with the countersunk hole, and the glue storage tank is opened in the fitting section of the oil return conduit.

[0014] Furthermore, the outlet of the cylinder head oil return chamber is provided with a joint connected to the upper end of the oil return conduit, and the glue storage tank is opened on the inner side of the upper end of the oil return conduit.

[0015] Furthermore, an oil return cavity is provided at the lower portion of the cylinder body and communicates with the oil pan, and a clearance is fitted between the lower end of the oil return conduit and the oil return cavity; a seal is provided at the connection between the oil return conduit and the cylinder body.

[0016] Furthermore, an enlarged hole is provided at the upper end of the oil return chamber of the cylinder body, and the sealing member is a sealing ring, which seals the outer side of the lower end of the oil return conduit and the inner side of the enlarged hole.

[0017] Furthermore, an extrusion flange is provided at the lower end of the oil return conduit, and the oil return conduit extrusion flange cooperates with the inner hole step formed by machining the enlarged hole to form a radial sealing ring groove.

[0018] Compared to existing technologies, the benefits of this new invention include: The oil return conduit is made of commercially available aluminum alloy tubing with a wall thickness of approximately 1mm, and is manufactured using an extrusion process. Each conduit weighs 0.02kg, a 95% reduction in weight compared to the original 4-5mm thick oil return conduit in a cast iron cylinder block. Replacing the cast oil passage with the oil return conduit significantly reduces the difficulty of cylinder block casting, improves product quality, and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a partial view of an engine in the prior art.

[0020] Figure 2 yes Figure 1 AA section view.

[0021] Figure 3 It is a cross-sectional view of the connection structure of the present utility model.

[0022] Figure 4 It is a schematic structural diagram of the oil return conduit of the utility model.

[0023] Figure 5 It is a schematic diagram of the connection between the oil return conduit and the cylinder head of the utility model.

[0024] Figure 6 It is a schematic diagram of the connection between the oil return conduit and the cylinder body of the utility model.

[0025] Description of Reference Numerals

[0026] 1. Cylinder head; 11. Cylinder head oil return chamber;

[0027] 2. Cylinder block; 21. Cylinder block oil return channel;

[0028] 3. Oil return pipe; 31. Rubber storage tank; 32. Enlarged hole; 33. Sealing ring; 34. Flange;

[0029] 4. Oil return chamber. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be emphasized that the following description is merely illustrative and is not intended to limit the scope and application of the present invention.

[0031] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein like reference numerals refer to like parts unless otherwise specifically specified.

[0032] like Figures 3 to 6The illustrated engine cylinder block oil return passage comprises a cylinder head 1 and a cylinder block 2. The cylinder head 1 is provided with a cylinder head oil return chamber 11, and the cylinder block 2 is provided with a cylinder block oil return passage 21 that interfaces with the cylinder head oil return chamber 11. The lower end of the cylinder block oil return passage 21 is connected to the oil pan. After lubrication and cooling, the engine oil flows back to the oil pan through the cylinder head oil return chamber 11 and the cylinder block oil return passage 21. The engine block also includes an oil return conduit 3, which replaces the cylinder block oil return passage 21. The upper end of the oil return conduit 3 is connected to the cylinder head oil return chamber 11, and the lower end is connected to the oil pan or the cylinder block 2, returning the engine oil to the oil pan. In this embodiment, the oil return conduit 3 is constructed from commercially available aluminum alloy tubing with a wall thickness of approximately 1 mm, manufactured using an extrusion process. Each oil return conduit 3 weighs 0.02 kg, a 95% reduction in weight compared to the original 4-5 mm thick oil return passage in the cast iron cylinder block 2. Replacing the cast oil passage in the cylinder block 2 with the oil return conduit 3 significantly reduces the casting difficulty, improves product quality, and reduces costs.

[0033] In the preferred embodiment, to facilitate installation and maintenance, the oil return conduit 3 is fixed to the cylinder head 1 with an interference fit, eliminating the need for additional mounting bolts. Furthermore, to eliminate the risk of oil leakage at the interface between the oil return conduit 3 and the cylinder head 1 due to component manufacturing tolerances, assembly process errors, engine operating temperature fluctuations, and vibration, two 0.2mm deep glue reservoirs 31 are installed at the upper end of the oil return conduit 3, where it seals with the cylinder head 1. When the oil return conduit 3 is assembled to the cylinder head 1, an appropriate amount of cylindrical retaining glue is applied to the reservoirs 31.

[0034] Reference Figure 5 , shows an embodiment of the cylinder head oil return chamber 11 and the oil return conduit 3. On the lower side of the cylinder head 1, the top of the counterbore connects to the cylinder head oil return chamber 11. The outer side of the upper end of the oil return conduit 3 is interference-fitted with the counterbore, and a rubber storage groove 31 is provided in the mating section of the oil return conduit 3. The rubber storage groove 31 is arranged along the outer side of the oil return conduit and is an annular groove.

[0035] Another implementation example of the above-mentioned cylinder head oil return chamber 11 and oil return duct 3 is that the outlet of the cylinder head oil return chamber 11 is provided with a joint connected to the upper end of the oil return duct 3, and the glue storage tank is opened on the inner side of the upper end of the oil return duct to enhance the sealing performance.

[0036] For illustration, the lower end of the oil return conduit 3 is connected to the cylinder block 2. An oil return chamber is provided at the bottom of the cylinder block 2, connecting to the oil pan. This chamber is part of the original cylinder block oil return passage 21, which returns the engine oil to the oil pan. Once securely fixed, the oil return conduit 3 is bolted to the cylinder block 2 together with the cylinder head 1. The lower end of the oil return conduit 3 and the oil return chamber are clearly aligned. To prevent leakage of returned oil, a seal is preferably provided at the connection between the oil return conduit 3 and the cylinder block 2 to enhance sealing.

[0037] Reference Figure 6 , showing one embodiment of the oil return duct and the cylinder block, an enlarged hole 32 is opened at the upper end of the oil return chamber of the cylinder block 2, and the sealing member is an O-ring 33. A radially sealed O-ring 33 is used between the oil return duct 3 and the cylinder block 2, and the O-ring 33 is used to seal the outer side of the lower end of the oil return duct 3 and the inner side of the enlarged hole 32.

[0038] Preferably, the lower end of the oil return conduit 3 is further provided with an extrusion flange 34, and the oil return conduit extrusion flange 34 is combined with the inner hole step formed by processing the expanded hole 32 to form a radial O-ring 33 groove, thereby finally achieving sealing and preventing the O-ring 33 from falling out.

[0039] Those skilled in the art will recognize that numerous variations to the foregoing description are possible, and that the examples and figures are intended only to describe one or more specific implementations.

[0040] Although what are considered exemplary embodiments of the present invention have been described and illustrated, it will be understood by those skilled in the art that various changes and substitutions may be made thereto without departing from the spirit of the present invention. In addition, many modifications may be made to adapt a particular situation to the teachings of the present invention without departing from the central concept of the present invention as described herein. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but rather may include all embodiments and their equivalents falling within the scope of the present invention.

Claims

1. An engine cylinder oil return passage, comprising a cylinder head, an oil pan and a cylinder body, wherein a cylinder head oil return chamber is provided inside the cylinder head, the cylinder body is provided with a cylinder oil return passage connected to the cylinder head oil return chamber, and the lower end of the cylinder oil return passage is connected to the oil pan, characterized in that: It also includes an oil return conduit, which is used to replace the cylinder block oil return channel. The upper end of the oil return conduit is connected to the cylinder head oil return cavity, and the lower end is connected to the oil pan or the cylinder block.

2. The engine cylinder oil return passage according to claim 1, characterized in that: The oil return conduit is made of aluminum alloy pipe material as a base material.

3. The engine cylinder oil return passage according to claim 1, characterized in that: The oil return conduit is connected to the cylinder head in an interference fit manner.

4. The engine cylinder oil return passage according to claim 2, characterized in that: At least one glue storage tank is arranged at the upper end of the oil return conduit and at the sealing portion connected with the cylinder head.

5. The engine cylinder oil return passage according to claim 4, characterized in that: The rubber storage tank is arranged along the outer side of the oil return conduit and is an annular groove.

6. The engine cylinder oil return passage according to claim 4, characterized in that: The lower side of the cylinder head is provided with a countersunk hole, the top of which is connected to the oil return chamber of the cylinder head; the outer side of the upper end of the oil return conduit is interference fit with the countersunk hole, and the rubber storage groove is opened in the fitting section of the oil return conduit.

7. The engine cylinder oil return passage according to claim 4, characterized in that: The outlet of the oil return chamber of the cylinder head is provided with a joint connected to the upper end of the oil return conduit, and the glue storage tank is arranged on the inner side of the upper end of the oil return conduit.

8. An engine cylinder oil return passage according to any one of claims 1 to 7, characterized in that: An oil return cavity is provided at the lower part of the cylinder body and communicates with the oil pan. The lower end of the oil return conduit is clearance-matched with the oil return cavity. A sealing member is provided at the connection between the oil return conduit and the cylinder body.

9. An engine cylinder oil return passage as claimed in claim 8, characterized in that: An enlarged hole is provided at the upper end of the oil return cavity of the cylinder body, and the sealing member is a sealing ring, which seals the outer side of the lower end of the oil return conduit and the inner side of the enlarged hole.

10. An engine cylinder oil return passage as claimed in claim 9, characterized in that: The lower end of the oil return conduit is also provided with an extrusion flange, and the oil return conduit extrusion flange cooperates with the inner hole step formed by machining the enlarged hole to form a radial sealing ring groove.

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