Oil-gas separation structure of crankcase body of motorcycle engine
By lowering the balance shaft installation hole in the crankcase of the motorcycle engine and using a maze partition to separate the exhaust gas return chamber, the problem of poor oil injection and lubricant oil return is solved, and efficient separation of exhaust gas and effective recycling of lubricant is achieved.
Patent Information
- Application Number
- CN202422651217.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-10-31
AI Technical Summary
The exhaust gas oil return chamber space of the crankcase of the existing motorcycle engine is small, resulting in serious waste gas injection and more oil filter bars are set, which affects the oil return effect of lubricating oil.
Move the balance shaft mounting hole downward to increase the space of the exhaust gas return chamber, and divide it into the upper exhaust chamber and the lower intake and oil return chamber through the maze partition. The intake and oil return holes and air outlets are set at diagonal positions to increase the length of the exhaust gas path and optimize the lubricant adhesion and oil return effect.
Effectively avoid waste gas injection, increase the chamber of waste gas return chamber, improve the effect of lubricating oil return, ensure that lubricating oil does not accumulate, and enhance the efficiency of waste gas discharge.
Smart Images
Figure CN223136233U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of motorcycle engines, and particularly relates to an oil-gas separation structure of a crankcase body of a motorcycle engine. Background Art
[0002] The crankcase body is one of the essential components of an engine. The left crankcase and the right crankcase are buckled together and locked by a closing bolt to form the engine crankcase body. A crankshaft mounting hole, a balance shaft mounting hole, a cylinder mounting surface, etc. are provided on the crankcase body. As Figure 1 shown, a labyrinth-shaped exhaust gas oil return chamber is provided at the upper end of the inner cavity of the crankcase, which is close to the balance shaft mounting hole. An oil inlet hole and an oil return hole are arranged horizontally on the exhaust gas oil return chamber. An exhaust hole is provided above the exhaust gas oil return chamber. After the oil-gas mixture generated by the crankcase enters the exhaust gas oil return chamber through the oil inlet hole, the lubricating oil adheres to each labyrinth partition of the chamber, deposits and drips into the crankcase through the oil return hole, and the exhaust gas is discharged through the exhaust hole. However, in the above structure, there are many partitions in the exhaust gas oil return chamber, with multiple oil filtering ribs distributed in a fan shape. At the same time, the exhaust gas oil return chamber is arranged close to the balance shaft mounting hole, resulting in limited setting space for the exhaust gas oil return chamber, making its overall cavity smaller, resulting in a relatively large air pressure at this place. When discharging the exhaust gas, there is usually an exhaust gas oil spraying phenomenon, and the oil spraying phenomenon becomes more serious as the displacement increases. Based on this, the applicant wants to change the position of the balance shaft hole to increase the setting space of the exhaust gas oil return chamber. At the same time, the exhaust gas oil return chamber is improved to increase its cavity and solve the problem of exhaust gas oil spraying. Summary of the Invention
[0003] Aiming at the above deficiencies existing in the prior art, the purpose of the utility model is to provide an oil-gas separation structure of a crankcase body of a motorcycle engine, which solves the problems that the setting space of the existing exhaust gas oil return chamber is small, and there are many oil filtering ribs, resulting in a small cavity of the exhaust gas chamber and the occurrence of exhaust gas oil spraying.
[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:
[0005] An oil-gas separation structure for a motorcycle engine crankcase body, comprising a crankcase body formed by connecting a left crankcase and a right crankcase. Inside the crankcase body, an exhaust gas oil return chamber is provided at the upper end of the crankcase body. A crankshaft mounting hole and a balance shaft mounting hole are provided on the crankcase body; the balance shaft mounting hole is located obliquely below the crankshaft mounting hole, and the exhaust gas oil return chamber is arranged close to the crankshaft mounting hole. A horizontally arranged labyrinth partition is provided in the middle of the exhaust gas oil return chamber. The labyrinth partition divides the exhaust gas oil return chamber into an upper exhaust chamber and a lower intake and oil return chamber. A chamber oil return hole is provided on the labyrinth partition; an exhaust hole is provided in the upper exhaust chamber, and an intake and oil return hole is provided at the lower end of the lower intake and oil return chamber. The intake and oil return hole and the exhaust hole are located at two diagonals of the exhaust gas oil return chamber. In this way, after the balance shaft mounting hole is moved downward, correspondingly, the space for arranging the exhaust gas oil return chamber at the upper end of the crankcase body will increase accordingly. At the same time, the exhaust gas oil return chamber is separated by a labyrinth partition that spans the exhaust gas oil return chamber. The length of the labyrinth partition is relatively long, which can meet the requirement of the adhesion area when the oil-gas mixture passes through. At the same time, after mainly separating the chamber by the labyrinth partition, the space occupied in the exhaust gas oil return chamber is small, further increasing the volume of the exhaust gas oil return chamber, relieving the pressure at this place, and avoiding the problem of exhaust gas oil spraying. And setting the intake and oil return hole and the exhaust hole at the diagonal position can effectively increase the path length of the exhaust gas passing through and meet the requirement of lubricating oil adhesion and deposition. The intake and oil return hole is located at the lower end of the lower intake and oil return chamber, at the lowest part of the chamber. The oil return here will not cause the accumulation of lubricating oil, and the oil return effect is good, and it is located at the position where the exhaust gas is concentrated, and the intake volume of the exhaust gas is also large.
[0006] Further, the left and right sides of the labyrinth partition are respectively connected to the left and right side walls of the exhaust gas oil return chamber, and the labyrinth partition is composed of a first cross partition provided on the left crankcase body and a second cross partition provided inside the crankcase. In this way, the left and right ends of the labyrinth partition are connected to the side walls of the chamber, which can ensure the strength of the labyrinth partition and avoid deformation and fracture after long-term use.
[0007] Further, an oil return groove is provided on each of the first cross partition and the second cross partition. After the first cross partition and the second cross partition are pressed tightly, the chamber oil return hole is formed; the chamber oil return hole is arranged close to the intake and oil discharge hole side. In this way, this setting can ensure that the chamber oil return hole is in the middle of the width direction of the labyrinth partition. Compared with being provided on one of the cross partitions, the set diameter is larger and the oil passing effect is better. The chamber oil return hole is arranged close to the intake and oil discharge hole side, which can shorten the oil return path.
[0008] Further, one end of the labyrinth partition close to the chamber oil return hole has an oil guiding inclined surface. In this way, the oil guiding inclined surface can guide the lubricating oil collected in the upper exhaust chamber to the chamber oil return hole through the oil guiding inclined surface, and the lubricating oil returns more quickly.
[0009] Further, a vertical oil filtering rib and a horizontal oil filtering rib are provided on the left crankcase and the right crankcase. The vertical oil filtering ribs and the horizontal oil filtering ribs are arranged in pairs and there is a gap between them and the labyrinth partition; the vertical oil filtering rib is arranged close to the exhaust hole, and the horizontal oil filtering rib is placed on the oil guiding inclined plane. In this way, the provided vertical oil filtering rib can reattach oil and gas to the waste gas at the exhaust hole, while the horizontal oil filtering rib can increase the waste gas attachment area at the air intake.
[0010] Further, both the chamber oil return hole and the intake oil return hole are provided on the right crankcase body, and the side wall of the lower exhaust chamber close to the intake oil return hole is arc-shaped. In this way, compared with the straight section, the oil guiding is smoother at this arc section. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 is a schematic structural diagram of the existing crankcase;
[0012] Figure 2 is a schematic structural diagram of the right crankcase in the embodiment;
[0013] Figure 3 is a schematic partial structural diagram of the left crankcase in the embodiment.
[0014] Figure 4 is a schematic partial structural diagram of the right crankcase in the embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. The components of the embodiments of the present utility model usually described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0016] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present utility model 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 thus should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", "coupled" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0017] Such as Figures 2 - 4As shown in the figure, an oil-gas separation structure for a motorcycle engine crankcase body includes a crankcase body formed by connecting a left crankcase 1 and a right crankcase 2. Inside the crankcase body, an exhaust gas oil return chamber 3 is provided at the upper end of the crankcase body. A crankshaft mounting hole 4 and a balance shaft mounting hole 5 are provided on the crankcase body. The balance shaft mounting hole 5 is located obliquely below the crankshaft mounting hole 4. The exhaust gas oil return chamber 3 is arranged close to the crankshaft mounting hole 4. A labyrinth partition 31 is horizontally arranged in the middle of the exhaust gas oil return chamber 3. The labyrinth partition 31 divides the exhaust gas oil return chamber 3 into an upper exhaust chamber 32 and a lower intake and oil return chamber 33. A chamber oil return hole 35 is provided on the labyrinth partition 31. An exhaust hole 36 is provided in the upper exhaust chamber 32. An intake and oil return hole 34 is provided at the lower end of the lower intake and oil return chamber 33. The intake and oil return hole 34 and the exhaust hole 36 are located at two diagonals of the exhaust gas oil return chamber 3. In this way, after the balance shaft mounting hole 5 is moved downward, correspondingly, the space for arranging the exhaust gas oil return chamber 3 at the upper end of the crankcase body will increase accordingly. At the same time, the exhaust gas oil return chamber 3 is separated by a labyrinth partition 31 that spans the exhaust gas oil return chamber 3. The length of the labyrinth partition 31 is relatively long, which can meet the requirement of the adhesion area when the oil-gas mixture passes through. At the same time, after mainly separating the chamber by the labyrinth partition 31, the space occupied in the exhaust gas oil return chamber 3 is small, further increasing the volume of the exhaust gas oil return chamber 3, relieving the pressure of the air pressure at this place, and avoiding the problem of exhaust gas spraying oil. And by arranging the intake and oil return hole 34 and the exhaust hole 36 at the diagonal positions, the path length of the exhaust gas passing through can be effectively increased, meeting the requirement of lubricating oil adhesion and deposition. The intake and oil return hole 34 is located at the lower end of the lower intake and oil return chamber 33, which is the lowest part of the chamber. The oil return at this place will not cause the accumulation of lubricating oil, and the oil return effect is good. And it is located at the position where the exhaust gas is concentrated, and the intake volume of the exhaust gas is also large. During use, the exhaust gas enters the lower intake and oil return chamber through the intake and oil return hole, then reaches the upper exhaust chamber through the chamber oil return hole, and finally the exhaust gas is discharged through the exhaust hole. When the exhaust gas passes through the lower intake and oil return chamber, the lubricating oil in the exhaust gas will adhere to the inner wall of the chamber. When passing through the upper exhaust chamber, the lubricating oil in the exhaust gas will adhere to the inner wall of the upper exhaust chamber. After a long time of collection, under the dual action of gravity and the fluidity of the lubricating oil, the lubricating oil in the upper exhaust chamber flows to the lower intake and oil return chamber through the chamber oil return hole, and finally drops to the lower part of the exhaust gas oil return chamber through the intake and oil return hole.
[0018] Further, the left and right sides of the labyrinth partition 31 are respectively connected to the left and right side walls of the exhaust gas oil return chamber 3, and the labyrinth partition 31 is composed of a first cross partition provided on the left crankcase 1 body and a second cross partition provided inside the crankcase. In this way, the left and right ends of the labyrinth partition 31 are connected to the chamber side walls, which can ensure the strength of the labyrinth partition 31 and avoid deformation and fracture after long-term use.
[0019] Further, an oil return groove is provided on each of the first transverse partition plate and the second transverse partition plate, and the two oil return grooves form the chamber oil return hole 35 after the first transverse partition plate and the second transverse partition plate are closely attached; the chamber oil return hole 35 is arranged close to the intake oil discharge hole. In this way, this setting can ensure that the chamber oil return hole 35 is located in the middle of the width direction of the labyrinth partition plate 31. Compared with being arranged on one of the transverse partition plates, the diameter of the chamber oil return hole 35 is larger, and the oil passing effect is better. The chamber oil return hole 35 is arranged close to the intake oil discharge hole, so that the oil return path can be shortened.
[0020] Further, one end of the labyrinth partition plate 31 close to the chamber oil return hole 35 has an oil guiding inclined surface 311. In this way, the oil guiding inclined surface 311 can guide the lubricating oil collected in the upper exhaust chamber 32 to the chamber oil return hole 35 through the oil guiding inclined surface 311, and the lubricating oil returns more quickly.
[0021] Further, a vertical oil filtering rib 37 and a horizontal oil filtering rib 38 are provided on the left crankcase 1 and the right crankcase 2. The vertical oil filtering rib 37 and the horizontal oil filtering rib 38 are arranged in pairs correspondingly, and there is a gap between them and the labyrinth partition plate 31; the vertical oil filtering rib 37 is arranged close to the exhaust hole 36, and the horizontal oil filtering rib 38 is placed on the oil guiding inclined surface 311. In this way, the provided vertical oil filtering rib 37 can reattach oil and gas to the waste gas at the exhaust hole 36, and the horizontal oil filtering rib 38 can increase the waste gas attachment area at the intake.
[0022] Further, both the chamber oil return hole 35 and the intake oil return hole 34 are arranged on the body of the right crankcase 2, and the side wall of the lower exhaust chamber close to the intake oil return hole 34 is arc-shaped. In this way, compared with the straight section, the oil guiding of the arc section is smoother.
[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the technical solutions. Those of ordinary skill in the art should understand that any modifications or equivalent replacements made to the technical solutions of the present invention without departing from the purpose and scope of the present technical solution shall be covered within the scope of the claims of the present invention.
Claims
1. An oil-gas separation structure for a motorcycle engine crankcase body, comprising a crankcase body formed by connecting a left crankcase and a right crankcase. An exhaust gas return oil chamber is provided at the upper end of the crankcase body inside the crankcase. A crankshaft mounting hole and a balance shaft mounting hole are provided on the crankcase body; characterized in that, The balance shaft mounting hole is located diagonally below the crankshaft mounting hole. The exhaust gas oil return chamber is arranged close to the crankshaft mounting hole. A labyrinth partition plate arranged horizontally is provided in the middle of the exhaust gas oil return chamber. The labyrinth partition plate divides the exhaust gas oil return chamber into an upper exhaust chamber and a lower intake oil return chamber. A chamber oil return hole is provided on the labyrinth partition plate. An exhaust hole is provided in the upper exhaust chamber. An intake oil return hole is provided at the lower end of the lower intake oil return chamber. The intake oil return hole and the exhaust hole are located at two diagonals of the exhaust gas oil return chamber.
2. The oil-gas separation structure of the crankcase body of a motorcycle engine according to claim 1, characterized in that, The left and right sides of the labyrinth partition plate are respectively connected to the left and right side walls of the exhaust gas oil return chamber. The labyrinth partition plate is composed of a first transverse partition plate provided on the left crankcase and a second transverse partition plate provided in the crankcase.
3. The oil-gas separation structure of the motorcycle engine crankcase body according to claim 2, characterized in that, An oil return groove is provided on each of the first transverse partition plate and the second transverse partition plate. After the first transverse partition plate and the second transverse partition plate are pressed close to each other, the chamber oil return hole is formed. The chamber oil return hole is arranged close to the intake oil discharge hole side.
4. The oil-gas separation structure of the crankcase body of a motorcycle engine according to claim 1 or 2 or 3, characterized in that, One end of the labyrinth partition plate close to the chamber oil return hole has an oil guiding inclined surface.
5. The oil-gas separation structure of the motorcycle engine crankcase body according to claim 4, characterized in that, A vertical oil filtering rib and a horizontal oil filtering rib are provided on the left crankcase and the right crankcase. The vertical oil filtering rib and the horizontal oil filtering rib are arranged in pairs and correspond to each other, and there is a gap between them and the labyrinth partition plate. The vertical oil filtering rib is arranged close to the exhaust hole, and the horizontal oil filtering rib is arranged on the oil guiding inclined surface.
6. The oil-gas separation structure of the motorcycle engine crankcase body according to claim 5, characterized in that, Both the chamber oil return hole and the intake oil return hole are provided on the right crankcase body, and the side wall of the lower exhaust chamber close to the intake oil return hole is arc-shaped.