A diesel engine crankcase sealing structure

Abstract

The application relates to a diesel engine crankcase sealing structure and relates to the technical field of diesel engines, which comprises a crankcase body and a sealing strip. The crankcase body comprises two half shells, the edges of the half shells are provided with butt edges, the butt edges of the two half shells abut and are provided with gaps, the sealing strip comprises an abutting part, the inner side of the abutting part is attached to and tightly abuts the outer sides of the butt edges and seals the gaps between the butt edges, and the sealing strip is clamped on the butt edges. The application has the effect that the sealing element can be replaced without opening the crankcase.

Description

Technical Field

[0001] This application relates to the field of diesel engine technology, and in particular to a diesel engine crankcase sealing structure. Background Technology

[0002] The crankcase is one of the key components of a diesel engine, and its sealing performance directly affects the engine's operating efficiency and lifespan. The crankcase typically consists of two halves and is used to withstand the forces transmitted from the connecting rods, converting them into torque which is then output through the crankshaft to drive other accessories connected to the crankshaft. The crankcase is subjected to the combined effects of centrifugal force from the rotating mass, periodically changing gas inertial force, and reciprocating inertial force, causing the crankshaft bearing to be subjected to bending and torsional loads. The crankcase also serves to prevent oil deterioration and to prevent leakage from the crankshaft oil seal and crankcase gasket.

[0003] Currently, the gap between the half-shells is generally formed by a single sealing ring. One half-shell has a sealing groove along its edge, with one side of the sealing ring fitting into the groove and the other side abutting against the edge of the other half-shell, thus sealing the gap between the half-shells. After prolonged use, the sealing ring will deform, wear, and age. To replace it, the crankcase must be opened and the half-shells separated, making replacement difficult. However, opening the crankcase requires disassembling external crankshaft accessories. Utility Model Content

[0004] To facilitate the replacement of sealing elements without opening the crankcase, this application provides a diesel engine crankcase sealing structure.

[0005] The technical solution for a diesel engine crankcase sealing structure provided in this application is as follows: A diesel engine crankcase sealing structure includes a crankcase body and a sealing strip. The crankcase body includes two half-shells, each half-shell having a mating edge. The mating edges of the two half-shells abut against each other, forming a gap. The sealing strip includes an abutting portion, the inner side of which is pressed against and abuts against the outer side of the two mating edges, sealing the gap between the mating edges. The sealing strip is snapped onto the two mating edges.

[0006] By adopting the above technical solution, the abutting part fits tightly against the outer sides of the two mating edges and seals the gap, ensuring the sealing effect. The stability of the sealing strip is ensured by the snap-fit, replacing the traditional built-in sealing ring design. When replacing, only the sealing strip on the outer side of the mating edge needs to be removed directly, without disassembling the external crankshaft accessories or opening the crankcase, thus improving maintenance efficiency.

[0007] Preferably, the inner side of the abutting part is provided with a first groove, and the outer side of the mating edge is integrally formed with a first protrusion extending away from the half shell. The first protrusion extends into the first groove and abuts against the first groove.

[0008] By adopting the above technical solution, the first protrusion and the first groove form a positioning fit, which not only realizes the quick alignment during the installation of the sealing strip, but also increases the contact area between the sealing strip and the mating edge, preventing the relative displacement of the sealing strip due to vibration during the operation of the diesel engine, and ensuring the sealing stability; at the same time, the fitting of the first groove and the first protrusion also forms the first sealing barrier, and the sealing barrier is distributed on both sides of the gap, reducing the risk of leakage and improving the sealing reliability.

[0009] Preferably, the mating edge has a second groove on the side away from the gap, and a second protrusion extending away from the gap is formed on the side of the second groove away from the half shell; the sealing strip also includes a side portion and a third protrusion, the side portion is provided on both sides of the abutment portion, one side portion is integrally formed with the abutment portion, the third protrusion is integrally formed with the other side portion, the third protrusion extends into the second groove and abuts against the second groove; the third protrusion, the abutment portion, and the side portion together form the third groove, and the second protrusion extends into the third groove and abuts against the third groove.

[0010] By adopting the above technical solution, the interlocking and cooperation of the third groove with the second protrusion and the third protrusion with the second groove further enhances the firmness of the sealing strip and the mating edge, preventing the sealing strip from falling off; at the same time, the interlocking of the third protrusion with the second groove provides gripping force for the abutting part, preventing leakage in the gap from pushing the abutting part away from the mating edge, causing the first groove and the first protrusion to separate; the side and the abutting part also increase the sealing contact range, and multiple contact interfaces further block the leakage path, improve the sealing performance, and at the same time disperse the force on the sealing strip, delaying deformation and aging.

[0011] Preferably, a protective soft shell is provided outside the sealing strip, and the protective soft shell is fixed on the outer side of the abutment portion and on the side away from the third groove.

[0012] By adopting the above technical solutions, the protective soft shell is isolated from external dust, mechanical friction and environmental factors that corrode the sealing strip, slowing down the aging rate of the sealing strip and extending its service life; at the same time, the protective soft shell has elastic deformation capability, which can deform with the sealing strip when it is assembled; in addition, the protective soft shell improves the tear resistance of the sealing strip.

[0013] Preferably, the sealing strip has connectors at both ends, the connectors are integrally formed with the protective soft shell, the two connectors are detachably connected, and the sealing strip is connected end to end.

[0014] By adopting the above technical solution, the sealing strip can be installed on the two mating edges without the head and tail being separated, without the need for overall sleeve installation, making the installation more flexible. After the sealing strip is snapped along the mating edge, the two joints are then connected to form a ring structure around the mating edge.

[0015] Preferably, the sealing strip has integrally formed sealing portions at both ends, and the sealing portions are located on the side where the two joints are close to each other, and the two joints abut against each other through the sealing portions.

[0016] By adopting the above technical solution, the sealing part fills the gap between the two joints, preventing oil leakage from the joint connection and ensuring the integrity of the overall seal of the sealing strip.

[0017] Preferably, the two connectors are detachably connected by bolts.

[0018] By adopting the above technical solution, the bolt connection has the characteristics of firm connection and strong vibration resistance, which can adapt to the high-frequency vibration environment when the diesel engine is working, avoid the joint from loosening, and the bolt is easy to disassemble.

[0019] Preferably, a reinforcing strip is provided on the side of the mating edge away from the gap, one side of the reinforcing strip is detachably connected to the mating edge, and the other side of the reinforcing strip abuts against the side of the side away from the third groove.

[0020] By adopting the above technical solution, the pressure strip is strengthened to form a pressing force on the side, further fixing the sealing strip and preventing the second groove and the third protrusion from separating from each other.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting a mating edge, sealing strip, abutting part, first protrusion, and first groove, the abutting part fits tightly against the outer side of the two mating edges and seals the gap. The first groove and the first protrusion fit together to form the first sealing barrier. The sealing barrier is distributed on both sides of the gap, reducing the risk of leakage and improving the sealing reliability. When replacing, only the sealing strip on the outer side of the mating edge needs to be removed directly. There is no need to remove the external crankshaft accessories and open the crankcase, which improves maintenance efficiency. 2. By setting a second groove, a second protrusion, a third protrusion, and a third groove, the engagement of the third protrusion with the second groove provides gripping force for the abutting part, preventing leakage in the gap from pushing the abutting part away from the mating edge, causing the first groove and the first protrusion to separate. The side and the abutting part also increase the sealing contact range, and multiple contact interfaces further block the leakage path, improving the sealing performance. 3. By setting joints and sealing parts, the sealing strip can be installed in the crankcase without the head and tail being separate, without the need for overall sleeve installation, making the installation more flexible. After the sealing strip is snapped along the mating edge, the two joints are then connected to form a ring structure around the mating edge. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a diesel engine crankcase sealing structure provided in the embodiments of this application.

[0023] Figure 2 yes Figure 1 Enlarged view of section A.

[0024] Figure 3 This is a partial cross-sectional schematic diagram illustrating the connection between the mating edge and the sealing strip in the embodiments of this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Crankcase body; 11. Half shell; 12. Butt joint edge; 121. First protrusion; 122. Second groove; 123. Second protrusion; 13. Gap; 2. Sealing strip; 21. Abutting part; 211. First groove; 22. Side part; 23. Third protrusion; 24. Third groove; 25. Protective soft shell; 251. Joint; 26. Sealing part; 3. Reinforcing strip. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0027] This application discloses a crankcase sealing structure for a diesel engine. (Refer to...) Figure 1 and Figure 3 The crankcase includes a crankcase body 1 and a sealing strip 2. The crankcase body 1 includes two half-shells 11. The edges of the half-shells 11 are integrally formed with mating edges 12 extending outward from the half-shells 11. The mating edges 12 of the two half-shells 11 abut against each other, forming a gap 13. In this embodiment, the sealing strip 2 is made of rubber.

[0028] Reference Figure 1 and Figure 3 The sealing strip 2 includes an abutment portion 21, the inner side of which abuts against and presses against the outer sides of the two mating edges 12, sealing the gap 13 between the mating edges 12. The sealing strip 2 is snapped onto the two mating edges 12. A first groove 211 is formed on the inner side of the abutment portion 21, and a first protrusion 121 is integrally formed on the outer side of the mating edge 12, extending away from the half-shell 11. The first protrusion 121 extends into the first groove 211 and abuts against it. The engagement of the first groove 211 and the first protrusion 121 forms a first sealing barrier, which is distributed on both sides of the outer end of the gap 13, reducing the risk of leakage and improving sealing reliability.

[0029] Reference Figure 1 and Figure 3The mating edge 12 has a second groove 122 on the side away from the gap 13. On the side of the second groove 12 away from the half-shell 11, a second protrusion 123 extending in the direction away from the gap 13 is formed. The sealing strip 2 also includes a side portion 22 and a third protrusion 23. The side portion 22 is located on both sides of the abutment portion 21, with one side of the side portion 22 integrally formed with the abutment portion 21, and the third protrusion 23 integrally formed with the other side of the side portion 22. The third protrusion 23 extends into the second groove 122 and abuts against it. The third protrusion 23, the abutment portion 21, and the side portion 22 together form a third groove 24. The second protrusion 123 extends into the third groove 24 and abuts against it. The engagement of the third protrusion 23 and the second groove 122 provides gripping force to both sides of the abutment portion 21, preventing leakage in the gap 13 from pushing the abutment portion 21 away from the mating edge 12 and causing separation of the first groove 211 and the first protrusion 121.

[0030] Reference Figure 1 and Figure 3 A protective soft shell 25 is provided outside the sealing strip 2. The protective soft shell 25 is made of soft plastic. The protective soft shell 25 is fixed to the outside of the abutment part 21 and the side of the side part 22 away from the third groove 24 by adhesive. The protective soft shell 25 isolates the sealing strip 2 from external dust, mechanical friction and environmental factors, thus slowing down the aging rate of the sealing strip 2 and extending its service life.

[0031] Reference Figure 2 and Figure 3 The sealing strip 2 has connectors 251 at both ends, which are integrally formed with the protective soft shell 25. The two connectors 251 are detachably connected by bolts, connecting the sealing strip 2 end to end. The sealing strip 2 also has integrally formed sealing portions 26 at both ends, located on the side where the two connectors 251 are close to each other, and each is fixed to one connector 251 with adhesive. The two connectors 251 abut against each other through the fixed sealing portions 26, ensuring a seal between them. The detachable connection between the two connectors 251 allows the sealing strip 2 to be installed on the two mating edges 12 without being separated end to end, making installation more flexible. After the sealing strip 2 is snapped along the mating edges 12, the two connectors 251 are then connected to form a ring structure around the mating edges 12.

[0032] Reference Figure 2 and Figure 3 A reinforcing strip is provided on the side of the mating edge 12 away from the gap 13. One side of the reinforcing strip is detachably connected to the mating edge 12 by bolts, and the other side of the reinforcing strip abuts against the side of the side portion 22 away from the third groove 24. The reinforcing strip exerts a pressing force on the side portion 22, further fixing the sealing strip 2 and preventing the second groove 122 from detaching from the third boss.

[0033] The implementation principle of a diesel engine crankcase sealing structure according to an embodiment of this application is as follows: When disassembling the sealing strip 2, it is not necessary to separate the two half-shells 11. First, the reinforcing strip is removed from the mating edge 12 to loosen the constraint on both sides of the sealing strip 2. Then, the connection of the two joints 251 is disassembled, so that the two ends of the sealing strip 2 are separated. Using a flathead screwdriver or other tools, the side 22 of the sealing strip 2 is pried outward, so that the third protrusion is disengaged from the second groove 122, and the snap-fit ​​is released. Next, the abutment part 21 of the sealing strip 2 is lifted away from the half-shell 11, and the sealing strip 2 is removed.

[0034] When installing the sealing strip 2, firstly, pry open both sides 22 and insert the first groove 211 on the inner side of the abutting part 21 of the sealing strip 2 into the first protrusion 121 on the outer side of the two mating edges 12, so that the abutting part 21 fits and presses tightly against the outer side of the two mating edges 12 to seal the gap 13 between the mating edges 12. Then, press the sides 22 of the sealing strip 2 towards the mating edges 12, so that the third protrusion 23 is completely inserted into the second groove 122 of the mating edge 12, and at the same time, the second protrusion 123 is embedded in the third groove 24, completing the snap-fit ​​fixing of the sealing strip 2 to the mating edge 12. Continue this process until the sealing strip 2 is wrapped around the outer side of the mating edge 12. Afterward, connect the joints 251 at both ends of the sealing strip 2 with bolts, so that the sealing strip 2 is connected end to end, forming a continuous sealing ring around the mating edge 12. Finally, press the reinforcing strip tightly against the outer side of the side 22 away from the third groove 24, and fix it to the mating edge 12 with bolts, thereby applying a stable pressing force to both sides of the sealing strip 2 to prevent it from loosening. This makes it easy to replace the sealing elements without opening the crankcase.

[0035] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A crankcase sealing structure for a diesel engine, comprising a crankcase body (1) and a sealing strip (2), wherein the crankcase body (1) comprises two half-shells (11), the edges of the half-shells (11) are provided with mating edges (12), the mating edges (12) of the two half-shells (11) abut against each other and form a gap (13), characterized in that: The sealing strip (2) includes an abutting part (21), the inner side of the abutting part (21) is attached to and abuts against the outer side of the two mating edges (12), and seals the gap (13) between the mating edges (12). The sealing strip (2) is snapped onto the two mating edges (12).

2. The diesel engine crankcase sealing structure according to claim 1, characterized in that: The inner side of the abutting part (21) is provided with a first groove (211), and the outer side of the mating edge (12) is integrally formed with a first protrusion (121) extending away from the half shell (11). The first protrusion (121) extends into the first groove (211) and abuts against the first groove (211).

3. The diesel engine crankcase sealing structure according to claim 1, characterized in that: The mating edge (12) has a second groove (122) on the side away from the gap (13). The mating edge (12) has a second protrusion (123) extending in the direction away from the gap (13) on the side of the second groove (122) away from the half shell (11). The sealing strip (2) also includes a side part (22) and a third protrusion (23). The side part (22) is located on both sides of the abutting part (21). One side of the side part (22) is integrally formed with the abutting part (21). The third protrusion (23) is integrally formed with the other side of the side part (22). The third protrusion (23) extends into the second groove (122) and abuts against the second groove (122). The third protrusion (23), the abutting part (21), and the side part (22) together form a third groove (24). The second protrusion (123) extends into the third groove (24) and abuts against the third groove (24).

4. The diesel engine crankcase sealing structure according to claim 3, characterized in that: The sealing strip (2) is provided with a protective soft shell (25), which is fixed on the outside of the abutment part (21) and the side of the side part (22) away from the third groove (24).

5. The diesel engine crankcase sealing structure according to claim 4, characterized in that: The sealing strip (2) is provided with connectors (251) at both ends. The connectors (251) are integrally formed with the protective soft shell (25). The two connectors (251) are detachably connected, so that the sealing strip (2) is connected end to end.

6. The diesel engine crankcase sealing structure according to claim 5, characterized in that: The sealing strip (2) has a sealing part (26) integrally formed at both ends. The sealing part (26) is located on the side where the two joints (251) are close to each other, and the two joints (251) abut against each other through the sealing part (26).

7. A diesel engine crankcase sealing structure according to claim 5, characterized in that: The two connectors (251) are detachably connected by bolts.

8. A diesel engine crankcase sealing structure according to claim 3, characterized in that: The mating edge (12) is provided with a reinforcing strip (3) on the side away from the gap (13). One side of the reinforcing strip (3) is detachably connected to the mating edge (12), and the other side of the reinforcing strip (3) abuts against the side of the side portion (22) away from the third groove (24).

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