Bearing lubrication system in crankcase of highly compact spark ignition type two-stroke diesel engine

Abstract

The invention provides a high-compactness spark ignition type two-stroke diesel engine crankcase inner bearing lubrication system which comprises a crankshaft, the crankshaft is composed of a rear crank, a front crank and a crank pin and is installed on a crankcase composed of an upper crankcase and a lower crankcase through a main bearing, and sealing between the interior of the crankcase and the outside is completed through an oil seal. A flow guide oil duct is arranged on the rear crank and used for conveying lubricating oil at the bottom of the crankcase to the position near the bearing, and lubrication of the bearing is completed. The bearing lubrication system in the crankcase of the highly compact spark ignition type two-stroke diesel engine is simple in structure and good in manufacturability, the lubrication condition of the main bearing is improved on the premise that the requirements for light weight and compactness of the whole diesel engine are met, the operation reliability of the whole diesel engine is improved, the service life of the whole diesel engine is prolonged, and guarantee is provided for further power improvement.

Description

Technical Field

[0001] The invention belongs to the technical field of internal combustion engines, and in particular relates to a highly compact internal bearing lubrication system for a spark-ignition two-stroke diesel engine crankcase. Background Art

[0002] The lubrication system of a traditional four-stroke diesel engine is a closed lubrication system, in which the oil in the oil tank or oil pan is transported to each lubrication point through the built-in oil channel by a built-in oil pump. The current spark-ignition two-stroke diesel engine adopts a design concept of low cost, reliability, and high compactness, and mostly adopts an open lubrication system. The lubricated oil enters the cylinder during the scavenging process to participate in combustion. Since the crankshaft is supported by grease-lubricated rolling bearings and has no lubrication oil channel, the lubrication oil circuit of the spark-ignition two-stroke diesel engine is greatly simplified, making the structure simpler and the cost greatly reduced. The spark-ignition two-stroke diesel engine is safe to use fuel, and takes into account the advantages of gasoline engines in terms of small size, simple structure, and high power-to-weight ratio. It has broad application prospects in micro-sized special equipment.

[0003] With the increase in the speed of two-stroke diesel engines and the increase in mechanical loads, grease alone can no longer meet the use requirements of bearings. It is necessary to introduce lubricating oil to splash lubricate the bearings to increase the service life of the bearings. In addition, the overall layout of the engine is compact, and there is not enough space in the diesel engine crankcase to arrange the lubricating oil guide structure, which is not conducive to the diffusion of lubricating oil mist, and has an extremely adverse effect on the lubrication of the bearings. Summary of the invention

[0004] In view of this, the present invention aims to propose a highly compact spark-ignition two-stroke diesel engine crankcase bearing lubrication system, so as to provide a spark-ignition two-stroke diesel engine crankcase bearing lubrication system that can achieve the diesel engine's lightweight, compactness and low cost requirements while ensuring reliability.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A highly compact spark-ignition two-stroke diesel engine crankcase bearing lubrication system comprises a crankshaft, which is composed of a rear crank, a front crank and a crank pin, and is mounted on a crankcase composed of an upper crankcase and a lower crankcase through a main bearing, and the crankcase interior is sealed from the outside through an oil seal, and is characterized in that a guide oil channel is provided on the rear crank, and the guide oil channel is used to transport the lubricating oil at the bottom of the crankcase to the vicinity of the bearing to complete the lubrication of the bearing.

[0007] Furthermore, both ends of the guide oil passage include an oil inlet hole and an oil outlet hole respectively.

[0008] Furthermore, the opening of the oil inlet hole ensures that the crankshaft is located below the crankcase liquid level when it rotates to its lowest end, and the opening of the oil outlet hole ensures that it faces the gap between the inner and outer bearing rings of the main bearing.

[0009] Furthermore, during the operation of the diesel engine, as the crankshaft rotates, the oil inlet opening is immersed below the lubricating oil level at the bottom of the crankcase, and the lubricating oil enters the guide oil channel. Under the action of inertia, the lubricating oil flows in the guide oil channel and flows out from the oil outlet to complete the lubrication of the bearing.

[0010] Compared with the prior art, the highly compact spark-ignition two-stroke diesel engine crankcase bearing lubrication system of the present invention has the following advantages:

[0011] (1) The highly compact spark-ignition two-stroke diesel engine crankcase bearing lubrication system described in the present invention has a simple structure and good processability. It improves the lubrication of the main bearing while ensuring the overall lightweight and compact requirements of the diesel engine, thereby improving the reliability and service life of the entire machine and providing a better guarantee for further power enhancement.

[0012] (2) The highly compact spark-ignition two-stroke diesel engine crankcase bearing lubrication system described in the present invention has a compact structure and does not occupy additional space, thereby ensuring the diesel engine's lightweight and compact requirements.

[0013] (3) The highly compact spark-ignition two-stroke diesel engine crankcase bearing lubrication system described in the present invention improves the main bearing poor lubrication problem caused by lightweight, compactness and high power in compact spark-ignition two-stroke diesel engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 A schematic diagram of a bearing lubrication system in a crankcase of a highly compact spark-ignition two-stroke diesel engine according to an embodiment of the present invention;

[0016] Figure 2 Schematic diagram of lubricating oil entering the oil guide channel according to an embodiment of the present invention Figure 1 ;

[0017] Figure 3 Schematic diagram of lubricating oil entering the oil guide channel according to an embodiment of the present invention Figure 2 ;

[0018] Figure 4 Schematic diagram of the flow of lubricating oil in the guide oil channel according to an embodiment of the present invention Figure 1 ;

[0019] Figure 5 Schematic diagram of the flow of lubricating oil in the guide oil channel according to an embodiment of the present invention Figure 2 .

[0020] Description of reference numerals:

[0021] 1. Rear crank; 11. Oil inlet hole; 12. Oil outlet hole; 2. Front crank; 3. Crank pin; 4. Upper crankcase; 5. Lower crankcase; 6. Main bearing; 7. Oil seal. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0026] A highly compact spark-ignition two-stroke diesel engine crankcase bearing lubrication system, such as Figures 1 to 5 As shown, the crankshaft includes a rear crank 1, a front crank 2, and a crank pin 3. The crankshaft is installed on a crankcase consisting of an upper crankcase 4 and a lower crankcase 5 through a main bearing 6, and the inside of the crankcase is sealed from the outside through an oil seal 7. A guide oil channel is provided on the rear crank 1, and the guide oil channel is used to transport the lubricating oil at the bottom of the crankcase to the vicinity of the bearing to complete the lubrication of the bearing.

[0027] The highly compact spark-ignition two-stroke diesel engine crankcase bearing lubrication system of this scheme has a simple structure, good processability, does not occupy additional space, improves the lubrication of the main bearing while ensuring the overall lightweight and compact requirements of the diesel engine, improves the reliability and service life of the whole machine, and improves the guarantee for further power improvement.

[0028] The two ends of the oil guide passage are respectively an oil inlet hole 11 and an oil outlet hole 12 .

[0029] The opening of the oil inlet hole 11 ensures that the crankshaft is located below the crankcase liquid level when it rotates to the lowest end, and the opening of the oil outlet hole 12 ensures that it faces the gap between the inner and outer bearing rings of the main bearing 6.

[0030] As attached Figure 2 And attached Figure 3 As shown, during the operation of the diesel engine, as the crankshaft rotates, the oil inlet hole 11 opens below the lubricating oil level at the bottom of the crankcase, and the lubricating oil enters the guide oil passage, as shown in the attached Figure 4 And attached Figure 5 As shown, the lubricating oil flows in the guide oil channel under the action of inertia and flows out from the oil outlet hole 12 to complete the lubrication of the bearing.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly compact crankcase bearing lubrication system for a spark-ignition two-stroke diesel engine, comprising a crankshaft, which comprises a rear crank, a front crank, and a crankpin, and is mounted on a crankcase comprising an upper crankcase and a lower crankcase via a main bearing, and sealed from the outside by an oil seal. The system is characterized by: An oil guide channel is provided on the rear crank, which is used to transport the lubricating oil at the bottom of the crankcase to the vicinity of the bearing to complete the lubrication of the bearing.

2. A highly compact spark-ignition two-stroke diesel engine crankcase bearing lubrication system according to claim 1, characterized in that: An oil inlet hole and an oil outlet hole are respectively provided at both ends of the guide oil channel.

3. A highly compact spark-ignition two-stroke diesel engine crankcase bearing lubrication system according to claim 2, characterized in that: The opening of the oil inlet hole ensures that the crankshaft is located below the crankcase liquid level when it rotates to its lowest end, and the opening of the oil outlet hole ensures that it is directly opposite to the gap between the inner and outer bearing rings of the main bearing.

4. A highly compact spark-ignition two-stroke diesel engine crankcase bearing lubrication system according to claim 2, characterized in that: During the operation of the diesel engine, as the crankshaft rotates, the oil inlet opening is immersed below the lubricating oil level at the bottom of the crankcase, and the lubricating oil enters the guide oil channel. Under the action of inertia, the lubricating oil flows in the guide oil channel and flows out from the oil outlet to complete the lubrication of the bearing.

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