Sealing structure of crankcase of diesel engine
By using sealing rings and oil passage structures in the diesel engine crankcase, the problem of lubricating oil leakage under high pressure was solved, and the lubricating oil could be recycled.
Patent Information
- Application Number
- CN202423235176.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing diesel engine crankcase sealing mechanisms are prone to oil leakage under high pressure, resulting in wasted lubricating oil.
A sealing ring is used to seal the crankshaft and the oil seal cover. Leaked lubricating oil is collected through an oil sump and then converged into the return oil passage through vertical and horizontal oil passages, and finally returned to the crankcase.
This achieves effective recovery of lubricating oil and reduces lubricating oil waste.
Smart Images
Figure CN223536453U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of diesel engines, and in particular to a diesel engine crankcase sealing structure. Background Technology
[0002] Currently, most diesel engine crankcase sealing mechanisms use rubber skeleton oil seals or labyrinth seal assemblies. Neither rubber skeleton oil seals nor labyrinth seal assemblies can handle high crankcase pressures. When the crankcase pressure is high, oil leakage is likely to occur, leading to a waste of lubricating oil. Utility Model Content
[0003] In view of this, the present invention provides a diesel engine crankcase sealing structure, which can achieve sealing between the crankshaft and the oil seal cover through the sealing ring, collect the lubricating oil leaking from the inside of the crankcase through the oil collection groove, and gather it in the vertical oil passage, enter the return oil passage through the horizontal oil passage, and finally flow into the crankcase, thereby realizing the recovery of leaked lubricating oil.
[0004] To achieve the above objectives, this utility model provides the following technical solution:
[0005] A diesel engine crankcase sealing structure, comprising:
[0006] An oil seal cover is used to cover the opening of the crankcase and prevent the lubricating oil inside the crankcase from flowing outward. The oil seal cover has a crankshaft opening for the crankshaft to pass through.
[0007] The sealing ring is used to abut against the oil seal cover and to fit the crankshaft. The sealing ring surrounds the crankshaft opening.
[0008] An oil collection groove is provided on the oil seal cover and communicates with the crankshaft port;
[0009] A vertical oil passage is located inside the oil seal cover and connects to the oil collection trough.
[0010] The transverse oil passage is located inside the oil seal cover and connects to the vertical oil passage.
[0011] The return oil passage is located inside the oil seal cover and connects the vertical oil passage to the crankcase. The top of the return oil passage is not higher than the bottom of the oil sump.
[0012] Preferably, the oil accumulation groove is annular and coaxially arranged with the crankshaft opening.
[0013] Preferably, the top of the oil return passage is connected to the inside of the crankcase.
[0014] Preferably, a deposition space is formed between the bottom ends of the transverse oil passage and the vertical oil passage.
[0015] Preferably, the sealing ring includes a retaining ring for fitting the crankshaft and a deformation ring for abutting against the oil seal cover. The deformation ring abuts against the oil seal cover and is squeezed towards the oil seal cover under the pressure inside the crankcase.
[0016] Preferably, the deformation ring is fixed to the end of the fixed ring and is flared, and the expanded end of the deformation ring is used to abut against the oil seal cover.
[0017] Preferably, a retaining ring for abutting against the inner wall of the crankcase opening is fixed on the retaining ring, and the retaining ring and the deformation ring are respectively located at both ends of the retaining ring.
[0018] Preferably, the retaining ring is fitted with an abutting ring for abutting the edge of the crankcase opening, and the two ends of the abutting ring abut against the deformation ring and the retaining ring, respectively.
[0019] As can be seen from the above technical solution, the diesel engine crankcase sealing structure provided by this utility model achieves the seal between the crankshaft and the oil seal cover through the sealing ring, collects the lubricating oil leaking from the inside of the crankcase through the oil collection groove, gathers it in the vertical oil passage, enters the return oil passage through the horizontal oil passage, and finally flows into the crankcase, thus realizing the recovery of leaked lubricating oil. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram illustrating a diesel engine crankcase sealing structure according to an exemplary embodiment;
[0022] Figure 2 This is a schematic diagram illustrating the structure of the right cover according to an exemplary embodiment;
[0023] Figure 3 This is a schematic diagram illustrating the structure of the left cover according to an exemplary embodiment;
[0024] Figure 4 This is a schematic diagram illustrating a deformation ring structure according to an exemplary embodiment;
[0025] Figure 5 This is a schematic diagram illustrating the position of a vertical oil passage according to an exemplary embodiment;
[0026] Figure 6 This is illustrated according to an exemplary embodiment. Figure 2 The middle view is an enlarged view of part B, which represents the fixed ring structure;
[0027] Figure 7 This is illustrated according to an exemplary embodiment. Figure 3 The middle view shows an enlarged view of part C of the retaining ring structure;
[0028] Figure 8 This is illustrated according to an exemplary embodiment. Figure 5 The middle section is an enlarged view of part D, which indicates the location of the transverse oil passage;
[0029] Figure 9 This is illustrated according to an exemplary embodiment for representation. Figure 1 The middle section is an enlarged view of part A, which indicates the location of the oil return port.
[0030] Figure label:
[0031] 1. Left cover; 11. Oil return passage; 12. Oil return port; 2. Right cover; 21. Vertical oil passage; 3. Oil seal cover; 4. Oil sump; 41. Crankshaft port; 5. Sealing ring; 51. Deformation ring; 52. Abutment ring; 53. Fixing ring; 54. Retaining ring; 6. Transverse oil passage. Detailed Implementation
[0032] This utility model discloses a diesel engine crankcase sealing structure, which can achieve a seal between the crankshaft and the oil seal cover through a sealing ring. The lubricating oil leaking from the inside of the crankcase is collected through an oil collection groove and converges in the vertical oil passage. It then enters the return oil passage through the horizontal oil passage and finally flows into the crankcase, thus realizing the recovery of leaked lubricating oil.
[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0034] This disclosure provides an exemplary embodiment of a diesel engine crankcase sealing structure, such as... Figure 1 As shown, Figure 1 This is a schematic diagram illustrating a diesel engine crankcase sealing structure according to an exemplary embodiment; Figure 2 This is a schematic diagram illustrating the structure of the right cover according to an exemplary embodiment; Figure 3 This is a schematic diagram illustrating the structure of the left cover according to an exemplary embodiment; Figure 4 This is a schematic diagram illustrating a deformation ring structure according to an exemplary embodiment; Figure 5 This is a schematic diagram illustrating the position of a vertical oil passage according to an exemplary embodiment; Figure 6This is illustrated according to an exemplary embodiment. Figure 3 The middle view is an enlarged view of part B, which represents the fixed ring structure; Figure 7 This is illustrated according to an exemplary embodiment. Figure 3 The middle view shows an enlarged view of part C of the retaining ring structure; Figure 8 This is illustrated according to an exemplary embodiment. Figure 5 The middle section is an enlarged view of part D, which indicates the location of the transverse oil passage; Figure 9 This is illustrated according to an exemplary embodiment for representation. Figure 1 The middle section is an enlarged view of part A, indicating the location of the oil return port. The following section is in conjunction with... Figures 1 to 9 To explain.
[0035] The specific embodiments described below are intended to help those skilled in the art understand this embodiment, but this embodiment is not limited to the specific embodiments described below.
[0036] Reference Figure 1 This disclosure provides an exemplary embodiment of a diesel engine crankcase sealing structure, which includes:
[0037] Oil seal cover 3 is used to cover the crankcase opening end to prevent the lubricating oil in the crankcase from flowing outward. The oil seal cover 3 has a crankshaft opening 41 for the crankshaft to pass through.
[0038] The sealing ring 5 is used to abut against the oil seal cover 3 and to fit the crankshaft. The sealing ring 5 surrounds the crankshaft opening 41.
[0039] An oil collection groove 4 is provided on the oil seal cover 3 and is connected to the crankshaft port 41;
[0040] A vertical oil passage 21 is located inside the oil seal cover 3 and is connected to the oil collection groove 4;
[0041] The transverse oil passage 6 is located inside the oil seal cover 3 and is connected to the vertical oil passage 21;
[0042] The oil return passage 11 is located inside the oil seal cover 3 and connects the vertical oil passage 21 and the crankcase. The top of the oil return passage 11 is not higher than the bottom of the oil sump 4.
[0043] For example, refer to Figure 2 and Figure 3 The oil seal cover 3 includes a left cover 1 and a right cover 2. The oil seal cover 3 has an axisymmetric structure. It is divided into two parts by the axis of symmetry of the oil seal cover 3, which forms the left cover 1 and the right cover 2. The left cover 1 and the right cover 2 are integrally formed. In this embodiment, the two are distinguished separately for ease of understanding.
[0044] The crankshaft opening 41 extends transversely through the oil seal cover 3. The annular groove formed by the indentation from the inner wall of the crankshaft opening 41 into the solid interior of the oil seal cover 3 is the oil accumulation groove 4. That is, the oil accumulation groove 4 is coaxially arranged with the crankshaft opening 41, and the diameter of the oil accumulation groove 4 is larger than the diameter of the crankshaft opening 41. The oil accumulation groove 4 is located between the two ends of the crankshaft opening 41. When the lubricating oil escapes along the outside of the crankcase oil seal cover 3, it will be thrown into the oil accumulation groove 4 under the centrifugal force of the rotating crankshaft when it passes the position of the crankshaft opening 41.
[0045] Reference Figure 3 and Figure 4 The sealing ring 5 includes a fixing ring 53 for fitting the crankshaft and a deformation ring 51 for abutting against the oil seal cover 3. The fixing ring 53 has a transversely oriented annular structure, and the deformation ring 51 has a trumpet-shaped structure. The smaller outer diameter end of the deformation ring 51 is coaxially fixed to one end of the fixing ring 53, and the larger outer diameter end of the deformation ring 51 is positioned towards the oil seal cover 3. The deformation ring 51 covers the crankshaft opening 41 while abutting against the oil seal cover 3, and is squeezed towards the oil seal cover 3 under the pressure inside the crankcase.
[0046] A retaining ring 54 is fixedly connected to the other end of the retaining ring 53. The retaining ring 54 is a ring-shaped structure with a larger diameter and coaxial with the retaining ring 53. The outer edge of the retaining ring 54 extends beyond the edge of the retaining ring 53, and part of the outer wall of the retaining ring 53 protrudes between the retaining ring 54 and the deformation ring 51. An abutting ring 52 is fitted on the retaining ring 53 to abut against the edge of the crankcase opening. The two ends of the abutting ring 52 abut against the deformation ring 51 and the retaining ring 54, respectively. The outer wall of the retaining ring 54 extends beyond the area beyond the outer wall of the abutting ring 52. After the oil seal cover 3 and the retaining ring 53 are fixed to the crankcase and crankshaft, respectively, the retaining ring 54 can abut against the inner wall at the opening of the crankcase and withstand the pressure from inside the crankcase, causing the sealing ring 5 to move or deform towards the oil seal cover 3. The abutting ring 52 can abut against the opening of the crankcase, withstand the compression from the opening of the crankcase, reduce the gap at the crankcase opening, and protect the retaining ring 53.
[0047] Reference Figure 5 and Figure 6 The vertical oil channel 21 is opened inside the right cover 2 and is set vertically. The bottom end of the vertical oil channel 21 is closed, and the top end of the vertical oil channel 21 penetrates the solid structure of the right cover 2 vertically and connects to the bottom end of the oil trough 4.
[0048] Reference Figure 5 and Figure 7 The return oil passage 11 is located inside the left cover 1 and is vertically arranged. The bottom end of the return oil passage 11 is closed, and the bottom end of the return oil passage 11 is located below the top end of the vertical oil passage 21. See also... Figure 9A transverse oil return port 12 is provided at the top of the oil return passage 11. The oil return port 12 passes through the left cover 1 along the axis of the crankshaft port 41. After the oil seal cover 3 is installed on the crankcase, the oil return port 12 connects the crankcase and the oil return passage 11. Since the oil return port 12 is located at the top of the oil return passage 11, the level of lubricating oil inside the crankcase is lower than the height of the oil return port 12, making it difficult for the lubricating oil inside the crankcase to flow back from the oil return port 12 into the oil return passage 11.
[0049] Reference Figure 5 and Figure 8 The transverse oil passage 6 consists of two parts, which are respectively opened inside the left cover 1 and the right cover 2. The axis of the transverse oil passage 6 is set horizontally and perpendicular to the axis of the crankshaft port 41. The transverse oil passage 6 connects the left cover 1 and the right cover 2 after they are merged to form the oil seal cover 3. That is, one end of the transverse oil passage 6 passes through the left cover 1 and connects to the return oil passage 11, and the other end of the transverse oil passage 6 passes through the right cover 2 and connects to the vertical oil passage 21. The transverse oil passage 6 is located between the two ends of the vertical oil passage 21 and between the two ends of the return oil passage 11. The area between the bottom ends of the transverse oil passage 6 and the vertical oil passage 21 forms a sedimentation space for the lubricating oil recovered inside the oil accumulation tank 4 to settle. The lubricating oil in the oil trough 4 slides down from the top of the vertical oil passage 21 into the vertical oil passage 21 and is stored inside the vertical oil passage 21 below the transverse oil passage 6. Metal shavings or other impurities carried by this part of the lubricating oil can be deposited in this section of the vertical oil passage 21. When the lubricating oil in the vertical oil passage 21 increases to the height of the transverse oil passage 6, the lubricating oil enters the return oil passage 11 from the transverse oil passage 6 and is stored in the return oil passage 11 until the liquid level of the lubricating oil in the return oil passage 11 and the vertical oil passage 21 reaches the return oil port 12. At this time, the lubricating oil flows back into the crankcase from the return oil port 12.
[0050] In this embodiment, the sealing ring 5 is used to seal the crankshaft and the oil seal cover. The lubricating oil leaking from the inside of the crankcase is collected by the oil collection groove 4 and gathers in the vertical oil passage 21. It then enters the return oil passage 11 through the horizontal oil passage 6 and finally flows into the crankcase, thus realizing the recovery of the leaked lubricating oil.
[0051] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A diesel engine crankcase sealing structure, characterized in that, include: Oil seal cover (3) is used to cover the crankcase opening end to prevent the lubricating oil in the crankcase from flowing outward. The oil seal cover (3) has a crankshaft opening (41) for the crankshaft to pass through. A sealing ring (5) is used to abut against the oil seal cover (3) and to fit the crankshaft. The sealing ring (5) surrounds the crankshaft opening (41). An oil collection groove (4) is provided on the oil seal cover (3) and communicates with the crankshaft port (41); A vertical oil passage (21) is opened inside the oil seal cover (3) and communicates with the oil accumulation groove (4); A transverse oil passage (6) is provided inside the oil seal cover (3) and communicates with the vertical oil passage (21); The return oil passage (11) is located inside the oil seal cover (3) and connects the vertical oil passage (21) and the crankcase. The top of the return oil passage (11) is not higher than the bottom of the oil sump (4).
2. The diesel engine crankcase sealing structure according to claim 1, characterized in that, The oil accumulation groove (4) is annular and coaxially arranged with the crankshaft opening (41).
3. The diesel engine crankcase sealing structure according to claim 1, characterized in that, The top of the oil return passage (11) is connected to the inside of the crankcase.
4. The diesel engine crankcase sealing structure according to claim 1, characterized in that, A deposition space is formed between the bottom of the transverse oil passage (6) and the vertical oil passage (21).
5. The diesel engine crankcase sealing structure according to claim 1, characterized in that, The sealing ring (5) includes a fixing ring (53) for fitting the crankshaft and a deformation ring (51) for abutting the oil seal cover (3). The deformation ring (51) abuts the oil seal cover (3) and is squeezed toward the oil seal cover (3) under the pressure inside the crankcase.
6. The diesel engine crankcase sealing structure according to claim 5, characterized in that, The deformation ring (51) is fixed to the end of the fixed ring (53) and is in the shape of a trumpet. The expanded end of the deformation ring (51) is used to abut against the oil seal cover (3).
7. The diesel engine crankcase sealing structure according to claim 6, characterized in that, A retaining ring (54) for abutting against the inner wall of the crankcase opening is fixed on the fixing ring (53). The retaining ring (54) and the deformation ring (51) are respectively located at both ends of the fixing ring (53).
8. The diesel engine crankcase sealing structure according to claim 7, characterized in that, The fixing ring (53) is fitted with an abutment ring (52) for abutting the edge of the crankcase opening. The two ends of the abutment ring (52) abut against the deformation ring (51) and the retaining ring (54) respectively.