A guided oil return structure of an engine
By setting up top-down inclined guide ribs and flow guide surfaces in the engine guide oil return structure, combined with the design of slow flow grooves, the problem of excessive oil mist during engine oil reflow is solved, and the stable return and low oil reflow are achieved Cost production.
Patent Information
- Application Number
- CN202110640147.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-06-08
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2041-06-08
AI Technical Summary
In the existing engine-guided oil return structure, excessive oil mist is likely to occur when the engine oil returns, resulting in oil injection and oil stirring, affecting the oil return effect.
Design an engine guide oil return structure. By providing top-down inclined guide ribs on the support wall of the box, the oil outlet of the engine oil passage is located on the side of the support wall close to the flywheel, and the lower edge of the oil outlet is The upper surface of the guide rib is joined, combined with the design of the guide surface and slow flow groove to ensure that the engine oil flows stably to the bottom of the inner cavity of the box and avoid falling directly onto the high-speed rotating flywheel or crankshaft.
It effectively avoids the oil stirring and oil mist caused by the oil flowing out of the oil outlet, ensuring the stable return and circulation of the oil, reducing process costs, and improving the oil return effect.
Smart Images
Figure CN113175391B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field and relates to a guiding oil return structure of an engine. Background Art
[0002] The engine lubrication system oil pump draws oil from the oil pool at the bottom of the crankcase. After being pressurized by the oil pump, it enters the main oil channel of the engine body, and then enters the oil filter for filtration. After filtration, it flows to the bearing holes and oblique oil holes in various parts of the engine body, and then flows out from the oil channel or oil outlet or is recovered into the oil pan.
[0003] The patent with application publication number CN103032129A discloses a concealed single-cylinder engine body lubricating oil circuit structure, including a cylinder body 1, a crankcase 2, a bearing cover 3, a base 4, a flywheel housing 5 and a transition oil pipe 6. A main oil channel 7 is arranged on the crankcase 2. The front end of the main oil channel 7 is connected to the transmission box, and the rear end is connected to the lubricating oil distribution oil hole 21 arranged on the flywheel housing 5. The main oil channel 7 is horizontally connected to the transverse oil channel 17. One end of the transverse oil channel 17 is set as a process plug, and the other end is connected to the transition oil pipe 6. The balance shaft main oil channels 8 and 9 are arranged on the base 4. The front ends of the balance shaft main oil channels 8 and 9 are connected to the transmission box, and the rear ends are connected to the lubricating oil distribution oil holes 22 and 23 arranged in the flywheel housing 5.
[0004] The oil return at the high position in the above oil circuit structure falls back into the oil pan by gravity, and the oil will splash to form transition oil mist after falling on the high-speed rotating flywheel, causing oil spraying at the oil-gas separation port. If it falls directly on the crankshaft, it is also easy to cause splashing and oil stirring, affecting the oil return effect. To solve the above problems, ordinary technicians in this field can easily consider: 1. Processing and connecting internal flow channels on the inner wall of the box to avoid interference from the crankshaft or flywheel when the oil returns; 2. Increasing the distance between the flywheel and crankshaft and the oil outlet to reduce the probability of contact between the two. Summary of the invention
[0005] In view of the above problems existing in the prior art, the present invention provides an engine oil return guide structure. The technical problem to be solved by the present invention is: how to alleviate the phenomenon of excessive oil mist in the box while controlling the process cost.
[0006] The purpose of the present invention can be achieved by the following technical solutions:
[0007] A guide oil return structure for an engine, the engine comprising a housing and a flywheel for connecting to a crankshaft transmission, the housing comprising a support wall for supporting an output end of the crankshaft, the flywheel being axially spaced apart from a side surface of the support wall, the oil return structure comprising an oil channel located in the support wall, characterized in that an oil outlet of the oil channel is located on a side of the support wall close to the flywheel, the side surface of the support wall having a guide rib 1 inclined from top to bottom, the lower edge of the oil outlet being engaged with an upper surface of the guide rib 1, and when the oil flows out from the oil outlet, it can flow along the guide rib 1 to the bottom of an inner cavity of the housing.
[0008] The casing provides support and protection for the crankshaft and the speed change mechanism. The supporting wall arranged in the casing can provide support for the output end of the crankshaft to ensure the stable rotation of the crankshaft. The output end of the crankshaft is mostly connected to the flywheel through the coaxial transmission to achieve power output. An oil channel is arranged in the supporting wall to transport the refluxed oil. The oil outlet of the oil channel is arranged on the side of the supporting wall close to the flywheel, and a guide rib 1 is arranged on the supporting wall so as to be inclined from top to bottom, so that the lower edge of the oil outlet is engaged with the upper surface of the guide rib 1. In this way, the structure of the guide rib 1 will not affect the rotation of the crankshaft and can be directly formed by casting, thereby ensuring low process cost and stability. The oil flowing out of the oil outlet can flow onto the guide rib 1 without any drop, and the flow velocity direction of the oil will not change too much, so that the oil is more easily guided by the inclined guide rib 1 under the action of gravity and tension, thereby gradually and steadily flowing to the bottom of the inner cavity of the casing. While controlling the processing cost, the oil is prevented from falling directly onto the high-speed rotating flywheel or crankshaft after flowing out of the oil outlet, resulting in excessive oil mist generated by crankshaft stirring or flywheel beating, and oil spraying at the oil-gas separation point.
[0009] In the guide oil return structure of the above-mentioned engine, the lower edge of the oil outlet and the inner cavity bottom surface of the oil channel are arranged with a gap in the upper and lower parts, and the guide rib 1 is arranged to protrude outward in the horizontal direction relative to the support wall surface. By setting a gap between the lower edge of the oil outlet and the inner cavity bottom surface of the oil channel, and making the guide rib 1 protrude outward in the horizontal direction, it is helpful to reduce the demoulding process cost of the guide rib 1 during casting. In addition, after the oil continuously flows to the bottom of the inner cavity in the oil channel, the liquid level needs to rise to the position of the oil outlet before it can flow onto the guide rib 1. In this process, the kinetic energy of the oil with initial velocity will be consumed in the oil pool formed at the bottom of the channel, and can only flow out slowly when it rises to the lower side of the oil outlet, which greatly reduces the influence of the initial velocity of the oil in the oil channel on the direction of the oil on the guide rib 1, avoids the oil from falling on the flywheel, and further alleviates the phenomenon of excessive oil mist.
[0010] In the above-mentioned guiding oil return structure of the engine, the inner cavity bottom surface of the oil passage has a guide surface inclined from top to bottom toward the side where the oil outlet is located, and the lower end of the guide surface is located directly below the oil outlet. By arranging the guide surface inclined from top to bottom toward the oil outlet on the inner cavity bottom surface of the oil passage, so that the lower end of the guide surface is located directly below the oil outlet, the oil in the oil passage will be quickly gathered to the lower end of the guide surface under the action of the guide surface, which is conducive to reducing the residual oil in the oil passage and keeping more oil to participate in the circulation process.
[0011] In the guide oil return structure of the above-mentioned engine, the guide surface is arranged parallel to the axis of the flywheel, the inner cavity side wall of the oil channel has a slow-flow groove arranged in the up-down direction, the lower inner side wall of the slow-flow groove is connected to the lower end of the guide surface, and the cross section of the slow-flow groove is U-shaped. By setting the guide surface parallel to the axis of the flywheel, and setting a slow-flow groove located at the lower end of the guide surface and extending up and down on the inner cavity side wall of the oil channel, the cross section of the slow-flow groove is set to be U-shaped, so that when the oil flows to the lower end of the guide surface through the guiding effect of the guide surface, it can form a collision in the slow-flow groove and quickly offset the kinetic energy, and then the flow rate is slower when it flows out through the oil outlet, ensuring the guiding effect of the guide rib.
[0012] In the above-mentioned guided oil return structure of the engine, the width dimension of the oil outlet along the horizontal direction can be gradually increased from the lowest point of the inner edge of the oil outlet upward. By setting the width dimension of the oil outlet along the horizontal direction to be gradually increased from bottom to top, when the oil output is large, the flow cross section of the oil can be quickly increased to avoid the oil channel pressure increase causing oil spraying, causing the flywheel to beat the oil and cause oil mist. Specifically, the oil outlet can be a triangle or a circle with the tip facing downward.
[0013] In the guide oil return structure of the above engine, the side of the support wall close to the flywheel also has a guide rib 2 arranged obliquely from top to bottom, the lower surface of the guide rib 2 is arranged opposite to the upper surface of the guide rib 1, and a flow channel for the oil to pass through is formed between the guide rib 2 and the guide rib 1. By arranging the guide rib 2 arranged obliquely from top to bottom on the side of the support wall, the lower surface of the guide rib 2 is arranged opposite to the upper surface of the guide rib 1 and forms a flow channel for the oil to pass through, so that even after the oil is accelerated and flies out along the guide rib 1, it will be restrained by the lower surface of the guide rib 2, so that the oil can flow stably to the bottom of the inner cavity of the box body and avoid splashing to the flywheel.
[0014] In the above-mentioned guided oil return structure of the engine, the support wall is provided with a lower oil port connected to the oil pan, and the lower oil port is located at the bottom end of the flow channel and is connected to the flow channel. By arranging the lower oil port connected to the oil pan on the support wall, the lower oil port is located at the bottom end of the flow channel and is connected to the flow channel, which is conducive to the oil flowing directly into the lower oil port through the flow channel to complete the recovery.
[0015] In the guided oil return structure of the above engine, the flow channel is directly opposite to the flywheel along the axial direction of the flywheel. By setting the flow channel directly opposite to the flywheel along the axial direction of the flywheel, even if part of the oil in the flow channel flies out to the surface of the flywheel, it is only thrown out, and it is difficult to directly collide with the flywheel from the outer edge of the flywheel, making the structure compact, lower in cost and avoiding excessive oil mist.
[0016] In the above-mentioned guide oil return structure of the engine, the inclination direction of the guide surface is consistent with the inclination direction of the guide rib 1. By setting the inclination direction of the guide surface to be consistent with the inclination direction of the guide rib 1, when the oil output increases, more oil with initial velocity guided by the guide surface can flow smoothly along the guide rib 1, reducing the distance and flow rate of the oil flowing toward the flywheel under this working condition, and alleviating the generation of oil mist.
[0017] Compared with the prior art, the advantages of the present invention are as follows:
[0018] The guide oil return structure of the present engine is achieved by setting a guide rib 1 which is arranged obliquely from top to bottom on the supporting wall in the casing, so that the lower edge of the oil outlet is engaged with the upper surface of the guide rib 1. In this way, the structure of the guide rib 1 will not affect the rotation of the crankshaft and can be directly formed by casting, thereby ensuring low process cost and stability. The engine oil flowing out of the oil outlet can flow onto the guide rib 1 without any drop, and the flow velocity direction of the engine oil will not change too much, so that the engine oil is more easily guided by the inclined guide rib 1 under the action of gravity and tension, thereby gradually and steadily flowing to the bottom of the casing inner cavity, while controlling the processing cost. At the same time, it is avoided that the engine oil flows out of the oil outlet, causing the crankshaft to stir the oil or the flywheel to beat to produce excessive oil mist, thereby causing oil spraying at the oil-gas separation point. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a three-dimensional schematic diagram of the assembly of the housing and the flywheel in this embodiment.
[0020] Figure 2 2 is a schematic diagram of the three-dimensional structure of the box body in this embodiment.
[0021] Figure 3 yes Figure 2 Enlarged view of part A in .
[0022] Figure 4 It is a side view structural diagram of the assembly of the housing and the flywheel in this embodiment.
[0023] Figure 5 yes Figure 4 Schematic diagram of the BB cross section.
[0024] Figure 6 yes Figure 5 Enlarged view of section C in .
[0025] Figure 7 yes Figure 4 Schematic diagram of DD section in.
[0026] Figure 8 yes Figure 7 Enlarged view of part E in .
[0027] Fig. 9 It is a top view of the structure of the box and the flywheel assembly in this embodiment.
[0028] Fig.10 yes Fig. 9 Enlarged view of the FF section.
[0029] Fig.11 yes Fig.10 Enlarged view of section G in .
[0030] In the figure, 1, box; 2, flywheel;
[0031] 3. Support wall; 31. Guide rib 1; 32. Guide rib 2; 33. Oil port;
[0032] 4. Oil channel; 41. Oil outlet; 42. Flow guide surface; 43. Slow flow groove;
[0033] 5. Runner. DETAILED DESCRIPTION
[0034] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0035] like Figure 1-11As shown, in the guide oil return structure of the present engine, the engine comprises a housing 1 and a flywheel 2 for connecting with the crankshaft transmission, the housing 1 comprises a support wall 3 for supporting the output end of the crankshaft, the flywheel 2 is arranged at intervals from the side of the support wall 3 along the axial direction, the oil return structure comprises an oil channel 4 located in the support wall 3, the oil outlet 41 of the oil channel 4 is located on the side of the support wall 3 close to the flywheel 2, the side of the support wall 3 has a guide rib 31 arranged obliquely from top to bottom, the lower side edge of the oil outlet 41 is engaged with the upper surface of the guide rib 31, when the oil flows out from the oil outlet 41, it can flow along the guide rib 31 to the bottom of the inner cavity of the housing 1. The housing 1 provides support and protection for the crankshaft and the speed change mechanism, the support wall 3 arranged in the housing 1 can provide support for the output end of the crankshaft to ensure the stable rotation of the crankshaft, the output end of the crankshaft is mostly connected with the flywheel 2 in a coaxial transmission manner, and the power output is realized through the flywheel 2, and the support wall 3 is provided with an oil channel 4 for conveying the refluxed oil. The oil outlet 41 of the oil channel 4 is arranged on the side of the support wall 3 close to the flywheel 2, and a guide rib 31 is arranged on the support wall 3 so as to be inclined from top to bottom, so that the lower edge of the oil outlet 41 is engaged with the upper surface of the guide rib 31. In this way, the structure of the guide rib 31 will not affect the rotation of the crankshaft and can be directly formed by casting, thereby ensuring low process cost and stability. The oil flowing out of the oil outlet 41 can flow to the guide rib 31 without any drop, and the flow velocity direction of the oil will not change too much, so that the oil is more easily guided by the inclined guide rib 31 under the action of gravity and tension, so as to gradually and stably flow to the bottom of the inner cavity of the casing 1. While controlling the processing cost, the oil is prevented from falling directly onto the high-speed rotating flywheel 2 or crankshaft after flowing out of the oil outlet 41, resulting in excessive oil mist generated by the crankshaft stirring the oil or the flywheel 2 beating, thereby generating oil spraying at the oil-gas separation point. Furthermore, there is a gap between the lower edge of the oil outlet 41 and the inner cavity bottom surface of the oil channel 4, and the guide rib 31 is arranged to protrude outward in the horizontal direction relative to the surface of the support wall 3. By setting a gap between the lower edge of the oil outlet 41 and the inner cavity bottom surface of the oil channel 4, and making the guide rib 31 protrude outward in the horizontal direction, it is helpful to reduce the demoulding process cost of the guide rib 31 during casting. In addition, after the oil continuously flows to the bottom of the inner cavity in the oil channel 4, the liquid level needs to rise to the position of the oil outlet 41 before it can flow onto the guide rib 31 of the flow channel 5. In this process, the kinetic energy of the oil with initial velocity will be consumed in the oil pool formed at the bottom of the channel, and can only flow out slowly when it rises to the lower side of the oil outlet 41, which greatly reduces the influence of the initial velocity of the oil in the oil channel 4 on the direction of the oil on the guide rib 31, prevents the oil from falling onto the flywheel 2, and further alleviates the phenomenon of excessive oil mist. The inner bottom surface of the oil passage 4 has a guide surface 42 which is arranged obliquely from top to bottom toward the side where the oil outlet 41 is located, and the lower end of the guide surface 42 is located directly below the oil outlet 41 .By setting a guide surface 42 inclined from top to bottom toward the oil outlet 41 on the inner cavity bottom surface of the oil channel 4, the lower end of the guide surface 42 is located directly below the oil outlet 41, so that the oil in the oil channel 4 will be quickly gathered to the lower end of the guide surface 42 by the action of the guide surface 42, which is conducive to reducing the residual oil in the oil channel 4 and keeping more oil to participate in the circulation process. The guide surface 42 is arranged parallel to the axis of the flywheel 2, and the inner cavity side wall of the oil channel 4 has a slow flow groove 43 arranged in the up and down direction. The lower inner side wall of the slow flow groove 43 is connected to the lower end of the guide surface 42, and the cross section of the slow flow groove 43 is U-shaped. By setting the guide surface 42 parallel to the axis of the flywheel 2, and setting the slow flow groove 43 located at the lower end of the guide surface 42 and extending up and down on the inner cavity side wall of the oil channel 4, the cross section of the slow flow groove 43 is set to be U-shaped, so that when the oil flows to the lower end of the guide surface 42 through the guiding effect of the guide surface 42, it can form a collision in the slow flow groove 43 and quickly offset the kinetic energy, and then the flow rate is slower when it flows out through the oil outlet 41, ensuring the guiding effect of the guide rib 31. The width dimension of the oil outlet 41 along the horizontal direction can be gradually increased from the lowest point of the inner edge of the oil outlet 41 upward. By setting the width dimension of the oil outlet 41 along the horizontal direction to be gradually increased from bottom to top, specifically, the oil outlet 41 is in a triangular shape with a downward tip, so that when the oil output is large, the flow cross section of the oil can be quickly increased, avoiding the oil channel 4 pressure increase to cause oil spray, causing the flywheel 2 to beat the oil and cause oil mist. The inclination direction of the guide surface 42 is consistent with the inclination direction of the guide rib 1 31. By setting the inclination direction of the guide surface 42 to be consistent with the inclination direction of the guide rib 1 31, when the oil output increases, more oil with initial velocity guided by the guide surface 42 can flow smoothly along the guide rib 1 31, reducing the distance and flow rate of the oil flowing toward the flywheel 2 under this working condition, and alleviating the generation of oil mist.
[0036] like Figure 1-4As shown, the side of the support wall 3 close to the flywheel 2 also has a guide rib 2 32 arranged obliquely from top to bottom, and the lower surface of the guide rib 2 32 is arranged opposite to the upper surface of the guide rib 1 31, and a flow channel 5 for the oil to pass through is formed between the guide rib 2 32 and the guide rib 1 31. By arranging the guide rib 2 32 arranged obliquely from top to bottom on the side of the support wall 3, the lower surface of the guide rib 2 32 is arranged opposite to the upper surface of the guide rib 1 31 and forms a flow channel 5 for the oil to pass through, so that the oil will be constrained by the lower surface of the guide rib 2 32 even after it is accelerated and flies out along the guide rib 1 31, so that the oil can flow stably to the bottom of the inner cavity of the box body 1 to avoid splashing to the flywheel 2. Further, the support wall 3 has a lower oil port 33 connected to the oil pan, and the lower oil port 33 is located at the bottom end of the flow channel 5 and is connected to the flow channel 5. By setting a lower oil port 33 connected to the oil pan on the support wall 3, the lower oil port 33 is located at the bottom of the flow channel 5 and is connected to the flow channel 5, so that the oil can flow directly into the lower oil port 33 through the flow channel 5 to complete the recovery. The flow channel 5 is directly opposite to the flywheel 2 along the axial direction of the flywheel 2. By setting the flow channel 5 to be directly opposite to the flywheel 2 along the axial direction of the flywheel 2, even if part of the oil in the flow channel 5 flies out to the surface of the flywheel 2, it is only thrown out, and it is difficult to collide with the flywheel 2 directly from the outer edge of the flywheel 2, so that the structure is compact, the cost is lower, and excessive oil mist is avoided.
[0037] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. An oil return guide structure for an engine, the engine comprising a housing (1) and a flywheel (2) for connecting to a crankshaft, the housing (1) comprising a support wall (3) for supporting an output end of the crankshaft, the flywheel (2) being spaced apart from a side surface of the support wall (3) in the axial direction, the oil return structure comprising an oil passage (4) located in the support wall (3), characterized in that: The oil outlet (41) of the engine oil passage (4) is located on a side of the support wall (3) close to the flywheel (2); the side surface of the support wall (3) has a guide rib (31) arranged obliquely from top to bottom; the lower edge of the oil outlet (41) is engaged with the upper surface of the guide rib (31); when the engine oil flows out of the oil outlet (41), it can flow along the guide rib (31) to the bottom of the inner cavity of the box body (1).
2. The engine oil return guide structure according to claim 1, characterized in that: The lower edge of the oil outlet (41) is spaced apart from the bottom surface of the inner cavity of the oil passage (4), and the guide rib (31) is arranged to protrude outward in a horizontal direction relative to the surface of the support wall (3).
3. The guided oil return structure of the engine according to claim 2, characterized in that: The inner cavity bottom surface of the oil passage (4) has a guide surface (42) which is arranged obliquely from top to bottom toward the side where the oil outlet (41) is located, and the lower end of the guide surface (42) is located directly below the oil outlet (41).
4. The engine oil return guide structure according to claim 3, characterized in that: The guide surface (42) is arranged parallel to the axis of the flywheel (2); the inner cavity side wall of the oil channel (4) has a slow-flow groove (43) arranged in the up-down direction; the inner side wall of the lower end of the slow-flow groove (43) is connected to the lower end of the guide surface (42); and the cross section of the slow-flow groove (43) is U-shaped.
5. The oil return guide structure of the engine according to claim 1, 2, 3 or 4, characterized in that: The width dimension of the oil outlet (41) along the horizontal direction can gradually increase upward from the lowest point of the inner edge of the oil outlet (41).
6. The oil return guide structure of the engine according to claim 1, 2, 3 or 4, characterized in that: The support wall (3) has a second guide rib (32) disposed obliquely from top to bottom on one side close to the flywheel (2); the lower surface of the second guide rib (32) is disposed opposite to the upper surface of the first guide rib (31); a flow channel (5) for oil to pass through is formed between the second guide rib (32) and the first guide rib (31).
7. The engine oil return guide structure according to claim 6, characterized in that: The support wall (3) is provided with a lower oil passage (33) which is in communication with the oil pan; the lower oil passage (33) is located at the bottom end of the flow channel (5) and is in communication with the flow channel (5).
8. The guided oil return structure of the engine according to claim 6, characterized in that: The flow channel (5) is directly opposite to the flywheel (2) along the axial direction of the flywheel (2).
9. The oil return guide structure of the engine according to claim 3 or 4, characterized in that: The inclination direction of the guide surface (42) is consistent with the inclination direction of the guide rib 1 (31).