An engine crankcase

Abstract

The utility model belongs to the technical field of engine parts, especially, relate to an engine crankcase, the split type design of upper box body and lower box body is convenient to the installation, overhaul and replacement of core parts such as crankshaft, connecting rod, conforms to the conventional process logic of engine assembly, the structure can utilize the natural collection of lubricating oil of ladder difference that is provided with ladder-shaped bottom surface in lower box body, promotes oil storage and circulation efficiency, upper box body and lower box body realize detachable connection through fastening assembly, provide the convenience for later maintenance, still be provided with sealing assembly between the two, can primarily block oil leakage, the end face of upper box body near lower box body is provided with a plurality of first grooves, and the corresponding end face of lower box body is provided with adaptive second grooves, and the assembly hole is formed by the alignment of the two, and the assembly plate is inserted in the assembly hole, and the assembly plate is inserted between the two grooves, can directly block the relative slip of joint surface under the vibration condition, significantly improves the rigidity of butt joint.

Description

Technical Field

[0001] This utility model belongs to the technical field of engine parts, and in particular relates to an engine crankcase. Background Technology

[0002] As a core component that houses the crankshaft and stores lubricating oil, the engine crankcase's structural design directly affects the engine's operational stability, service life, and sealing reliability. In existing technologies, crankcases often adopt a split structure to facilitate component assembly and subsequent maintenance. However, the rigidity at the joint between the upper and lower housings is insufficient, and vibrations generated during engine operation can easily cause relative slippage of the housing's mating surfaces, affecting the sealing effect and structural stability. Utility Model Content

[0003] The purpose of this utility model is to provide an engine crankcase to address the aforementioned technical problems, thereby solving the issues raised in the background section.

[0004] In view of this, the present invention provides an engine crankcase, the crankcase body including a split upper case and a lower case, the lower case having a stepped bottom surface, and an oil drain hole provided on the stepped bottom surface; Fastening components allow for a detachable connection between the upper and lower housings; A sealing assembly is provided between the upper and lower housings; The upper box has several first grooves on one end face near the lower box, and the lower box has a second groove that matches the first grooves on one end face near the upper box. The first grooves and the second grooves are aligned and enclosed to form an assembly hole, and an assembly plate is inserted into the assembly hole.

[0005] In the above technical solution, both the first groove and the second groove are rectangular grooves with chamfers, and the length of the assembly hole formed by the alignment and enclosing of the first groove and the second groove is greater than the length of the assembly plate.

[0006] In the above technical solution, further, the sidewall of the stepped bottom surface is provided with a number of reinforcing ribs, and a number of reinforcing members are symmetrically arranged above the stepped bottom surface. The reinforcing members include two symmetrically arranged vertical bosses, and a transverse partition is provided between the two vertical bosses.

[0007] In the above technical solution, the fastening components include bolts and nuts. The upper housing end has several first fastening holes, and the lower housing end has several second fastening holes that are compatible with the first fastening holes. The bolts pass through the second fastening holes and the first fastening holes in sequence and are then threadedly connected to the nuts. A washer is provided between the nuts and the upper housing.

[0008] In the above technical solution, the first groove and the second groove are further formed between two adjacent first fastening holes and second fastening holes, respectively.

[0009] In the above technical solution, the sealing component further includes: An upper annular groove is provided on the side of the upper box body near the lower box body; The lower annular groove is provided on the side of the lower housing that is close to the upper housing, and it is adapted to the upper annular groove. The first sealing ring is embedded between the upper annular groove and the lower annular groove.

[0010] In the above technical solution, the sealing assembly further includes: The lower housing has a mating flange on its side wall. A sealing groove is provided on the upper surface of the mating flange; The second sealing ring is provided on the sealing groove.

[0011] In the above technical solution, the mating flange further includes two connecting arms and a connecting plate. The sealing groove is formed by two parallel connecting arms and a connecting plate vertically arranged between the two connecting arms. One connecting arm is fixedly connected to the side wall of the lower housing, and the end of the other connecting arm is fixedly connected to a transverse connecting rib. A longitudinal connecting rib is connected to one side of the transverse connecting rib.

[0012] The beneficial effects of this utility model are as follows: 1. By inserting the assembly plate between the two grooves, the relative slippage of the joint surface under vibration conditions can be directly prevented, significantly improving the rigidity of the joint. At the same time, the plug-in design does not affect the detachable characteristics of the upper and lower boxes, perfectly solving the contradiction between "rigidity improvement and assembly convenience" and avoiding the increased cost and time problems caused by traditional bolt reinforcement solutions.

[0013] 2. The upper and lower housings are detachably connected by fastening components, providing convenience for future maintenance.

[0014] 3. A sealing assembly is also installed between the upper and lower housings to initially prevent oil leakage. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an exploded view of this utility model; Figure 3 This is a schematic diagram of the lower housing structure of this utility model; Figure 4 This is a cross-sectional view of the assembly plate structure of this utility model; Figure 5This is a cross-sectional view of the present invention; Figure 6 This is a utility model Figure 5 A magnified view of a section at point A in the middle; The markings in the diagram are as follows: 1-Upper housing, 2-Lower housing, 3-Stepped bottom surface, 4-Oil drain hole, 5-First groove, 6-Second groove, 7-Assembly plate, 8-Reinforcing rib, 9-Vertical boss, 10-Transverse partition, 11-Bolt, 12-Nut, 13-First fastening hole, 14-Second fastening hole, 15-Upper annular groove, 16-Lower annular groove, 17-First sealing ring, 18-Butt flange, 19-Sealing groove, 20-Second sealing ring, 21-Connecting arm, 22-Transverse connecting rib, 23-Longitudinal connecting rib, 24-Washer. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0017] Example 1:

[0018] This embodiment provides an engine crankcase, including: The crankcase body includes an upper housing 1 and a lower housing 2, which are separated. The lower housing 2 has a stepped bottom surface 3, and an oil drain hole 4 is provided on the stepped bottom surface 3. Fastening assembly: The upper housing 1 and the lower housing 2 are detachably connected by the fastening assembly; A sealing assembly is provided between the upper housing 1 and the lower housing 2; The upper box 1 has several first grooves 5 on one end face near the lower box 2, and the lower box 2 has a second groove 6 that matches the first grooves 5 on one end face near the upper box 1. The first grooves 5 and the second grooves 6 are aligned and enclosed to form an assembly hole, and an assembly plate 7 is inserted into the assembly hole.

[0019] As can be seen from this embodiment, the split design of the upper housing 1 and the lower housing 2 can directly avoid the assembly space limitations of large components such as the crankshaft, facilitating the installation, maintenance, and replacement of core components such as the crankshaft and connecting rod, which conforms to the conventional process logic of engine assembly. The lower housing 2 is provided with a stepped bottom surface 3. This structure can, on the one hand, utilize the step difference to achieve natural collection of lubricating oil, improving the oil storage and circulation efficiency; on the other hand, the non-planar shape disperses the pressure borne by the bottom surface, reducing stress concentration on a single plane. At the same time, the stepped bottom surface 3 has an oil drain hole 4, which can quickly drain the old oil, simplifying the oil change operation and solving the problem of incomplete oil drainage in traditional flat-bottom structures. The upper housing 1 and the lower housing 2 are secured by fastening components. The detachable connection facilitates future maintenance, and a sealing component is installed between the two to initially prevent oil leakage. Several first grooves 5 are opened on the end face of the upper housing 1 near the lower housing 2, and a matching second groove 6 is opened on the corresponding end face of the lower housing 2. The two are aligned to form an assembly hole, and an assembly plate 7 is inserted into the assembly hole. This structure does not require an increase in the number of bolts. By inserting the assembly plate 7 between the two grooves, the relative slippage of the joint surface under vibration conditions can be directly prevented, significantly improving the rigidity of the joint. At the same time, the plug-in design does not affect the detachable characteristics of the upper and lower housings, perfectly solving the contradiction between "rigidity improvement and assembly convenience" and avoiding the increased cost and time problems caused by traditional bolt reinforcement solutions.

[0020] Example 2:

[0021] This embodiment provides an engine crankcase, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0022] Both the first groove 5 and the second groove 6 are rectangular grooves with chamfers. The length of the assembly hole formed by the alignment of the first groove 5 and the second groove 6 is greater than the length of the assembly plate 7.

[0023] As can be seen in this embodiment, both the first groove 5 and the second groove 6 are rectangular grooves. The rectangular grooves allow the assembly plate 7 to form a surface contact with the inner wall of the groove. Compared with structures such as arc grooves, the force is more uniform, which can further enhance the anti-slip effect of the joint surface. Moreover, the milling process of the rectangular groove is mature, requiring no special tools and reducing the cost of mass production. At the same time, the rectangular grooves are chamfered. This design can effectively prevent the groove edges from scratching the surface of the assembly plate 7 during assembly, reducing the risk of component damage. It can also reduce the alignment difficulty during assembly. Operators can smoothly insert the assembly plate 7 without precise alignment, improving assembly efficiency. The length of the assembly hole formed by the first groove 5 and the second groove 6 is greater than the length of the assembly plate 7. This size design provides a reasonable assembly allowance for the assembly plate 7, which can accommodate minor machining errors during the processing of the upper and lower boxes, avoiding the problem of the assembly plate 7 being unable to be inserted due to insufficient hole accuracy. At the same time, the reserved gap will not affect the overall rigidity, ensuring a balance between assembly smoothness and structural stability.

[0024] Example 3:

[0025] This embodiment provides an engine crankcase, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0026] The sidewall of the stepped bottom surface 3 is provided with several reinforcing ribs 8, and several reinforcing members are symmetrically arranged above the stepped bottom surface 3. The reinforcing members include two symmetrically arranged vertical bosses 9, and a transverse partition 10 is provided between the two vertical bosses 9.

[0027] As can be seen in this embodiment, the sidewalls of the stepped bottom surface 3 are provided with several reinforcing ribs 8. When the engine is working, the impact of the lubricating oil and the vibration of the crankshaft will generate a continuous load on the bottom surface. The reinforcing ribs 8 can disperse the stress generated by these loads through their own structure, avoiding the bottom surface from sinking or cracking. Especially for the stress concentration area at the step transition, the reinforcing ribs 8 can effectively improve the deformation resistance of this part and extend the service life of the bottom surface. Several reinforcing members are symmetrically arranged above the stepped bottom surface 3. The reinforcing members are composed of two symmetrical vertical bosses 9 and a transverse partition 10. The vertical bosses 9 can serve as an auxiliary support structure for the crankshaft bearing seat, enhancing the stability of the bearing seat and reducing the radial runout when the crankshaft rotates. The transverse partition 10 connects the two vertical bosses 9 to form a frame support structure, which can disperse the pressure borne by the vertical bosses 9 and enhance the overall rigidity after the upper and lower housings are connected, reduce the energy transmitted to the housing by vibration, and reduce engine operating noise. At the same time, the symmetrical layout ensures that the internal force of the crankcase is uniform, avoiding structural damage caused by local stress concentration.

[0028] Example 4:

[0029] This embodiment provides an engine crankcase, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0030] The fastening assembly includes a bolt 11 and a nut 12. The upper housing 1 has several first fastening holes 13 at its end, and the lower housing 2 has several second fastening holes 14 that are adapted to the first fastening holes 13 at its end. The bolt 11 passes through the second fastening holes 14 and the first fastening holes 13 in sequence and is then threadedly connected to the nut 12. A washer 24 is provided between the nut 12 and the upper housing 1.

[0031] As can be seen in this embodiment, the upper housing 1 has several first fastening holes 13 at its end, and the lower housing 2 has corresponding matching second fastening holes 14 at its end. The bolt 11 passes through the second fastening holes 14 and the first fastening holes 13 in sequence and is then threadedly connected to the nut 12, which can achieve a firm connection between the upper and lower housings. It is also detachable for easy maintenance and replacement of parts in the future. The washer 24 set between the nut 12 and the upper housing 1 can, on the one hand, disperse the pressure of the nut 12 on the end face of the upper housing 1, and avoid excessive local pressure that could cause deformation or damage to the end face of the housing, especially for housings made of aluminum alloy. On the other hand, the washer 24 can produce an elastic buffering effect, reduce the impact of engine vibration on the threaded connection, prevent the bolt 11 from loosening, and ensure the stability of the fastening structure during long-term use.

[0032] Example 5:

[0033] This embodiment provides an engine crankcase, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0034] The first groove 5 and the second groove 6 are respectively formed between two adjacent first fastening holes 13 and second fastening holes 14.

[0035] As can be seen from this embodiment, the first groove 5 and the second groove 6 are respectively opened between two adjacent first fastening holes 13 and second fastening holes 14. This layout makes the fastening force and the anti-slip force of the mounting plate 7 alternately distributed on the mating surface. The area between adjacent fastening holes is a region with weak mating surface rigidity because the bolt fastening force is difficult to cover this area. The setting of the mounting plate 7 makes up for the lack of rigidity in this area, maximizes the overall rigidity of the mating surface, and avoids deformation in local areas due to insufficient rigidity. At the same time, this layout does not require additional installation space, and achieves rigidity enhancement without changing the overall size of the crankcase. It takes into account both structural compactness and performance improvement, and is suitable for the limited installation space in the engine compartment.

[0036] Example 6:

[0037] This embodiment provides an engine crankcase, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0038] The sealing assembly includes: Upper annular groove 15: An upper annular groove 15 is provided on the side of the upper box 1 near the lower box 2; The lower annular groove 16 is provided on the side of the lower box 2 near the upper box 1, which is adapted to the upper annular groove 15. The first sealing ring 17 is embedded between the upper annular groove 15 and the lower annular groove 16.

[0039] As can be seen from this embodiment, the sealing assembly includes an upper annular groove 15, a lower annular groove 16, and a first sealing ring 17. The upper annular groove 15 is provided on the side of the upper housing 1 near the lower housing 2, and the corresponding side of the lower housing 2 is provided with a matching lower annular groove 16. The first sealing ring 17 is embedded therein. The cavity formed by the upper and lower annular grooves provides a stable installation space for the first sealing ring 17, which can effectively limit the displacement of the first sealing ring 17 and prevent the first sealing ring from falling off or deforming due to engine vibration. After assembly, the first sealing ring 17 can be fully compressed to form a tight sealing contact, which can maintain good sealing performance and prevent oil leakage due to viscosity decrease caused by temperature rise.

[0040] Example 7:

[0041] This embodiment provides an engine crankcase, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0042] The sealing assembly also includes: A mating flange 18 is provided on the side wall of the lower housing 2; The sealing groove 19 is provided on the upper surface of the mating flange 18; The second sealing ring 20 is provided on the sealing groove 19.

[0043] As can be seen in this embodiment, the sealing assembly also includes a mating flange 18, a sealing groove 19, and a second sealing ring 20. The mating flange 18 is provided on the side wall of the lower housing 2, providing an installation base for the second sealing ring 20 and forming a double sealing structure. Even if the first sealing ring 17 has a slight leakage, the second sealing ring 20 can prevent further oil leakage, significantly improving sealing redundancy and reducing the risk of oil leakage. The second sealing ring 20 can also block external dust and other impurities. The sealing groove 19 opened on the upper surface of the mating flange 18 can fix the position of the second sealing ring 20, preventing it from shifting during assembly or use and ensuring the effectiveness of the auxiliary seal. At the same time, the depth and width of the sealing groove 19 are designed so that the depth is slightly larger than the cross-sectional radius of the sealing ring, which allows the sealing ring to remain in a moderately compressed state after assembly, further enhancing the sealing effect.

[0044] Example 8:

[0045] This embodiment provides an engine crankcase, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0046] The mating flange 18 includes two connecting arms 21 and a connecting plate. The sealing groove 19 is formed by two parallel connecting arms 21 and a connecting plate vertically arranged between the two connecting arms 21. One of the connecting arms 21 is fixedly connected to the side wall of the lower housing 2, and the end of the other connecting arm 21 is fixedly connected to a transverse connecting rib 22. A longitudinal connecting rib 23 is connected to one side of the transverse connecting rib 22.

[0047] As can be seen from this embodiment, the mating flange 18 includes two connecting arms 21 and a connecting plate. The sealing groove 19 is formed by two parallel connecting arms 21 and a vertically arranged connecting plate. One of the connecting arms 21 is fixedly connected to the side wall of the lower housing 2. This integrated structure can ensure the connection strength between the sealing groove 19 and the lower housing 2. The other connecting arm 21 is fixedly connected to a transverse connecting rib 22 at its end. A longitudinal connecting rib 23 is connected to one side of the transverse connecting rib 22. Under engine vibration conditions, the shape accuracy of the sealing groove 19 can be effectively maintained, and the deformation of the groove can be avoided, which would cause the second sealing ring 20 to fail.

[0048] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An engine crankcase, characterized in that, include: The crankcase body includes an upper housing (1) and a lower housing (2) that are separately configured. The lower housing (2) has a stepped bottom surface (3) and an oil drain hole (4) is provided on the stepped bottom surface (3). Fastening assembly, the upper housing (1) and the lower housing (2) are detachably connected by the fastening assembly; A sealing assembly is provided between the upper housing (1) and the lower housing (2); Among them, the upper box (1) has a plurality of first grooves (5) on one end face near the lower box (2), and the lower box (2) has a second groove (6) that matches the first grooves (5) on one end face near the upper box (1). The first grooves (5) and the second grooves (6) are aligned and enclosed to form an assembly hole, and an assembly plate (7) is inserted into the assembly hole.

2. The engine crankcase according to claim 1, characterized in that, Both the first groove (5) and the second groove (6) are rectangular grooves with chamfers. The length of the assembly hole formed by the alignment of the first groove (5) and the second groove (6) is greater than the length of the assembly plate (7).

3. The engine crankcase according to claim 1, characterized in that, The sidewall of the stepped bottom surface (3) is provided with a number of reinforcing ribs (8), and a number of reinforcing members are symmetrically arranged above the stepped bottom surface (3). The reinforcing members include two symmetrically arranged vertical bosses (9), and a transverse partition (10) is provided between the two vertical bosses (9).

4. The engine crankcase according to claim 1, characterized in that, The fastening assembly includes a bolt (11) and a nut (12). The upper housing (1) has several first fastening holes (13) at its end, and the lower housing (2) has several second fastening holes (14) that are compatible with the first fastening holes (13) at its end. The bolt (11) passes through the second fastening holes (14) and the first fastening holes (13) in sequence and is then threaded to the nut (12). A washer (24) is provided between the nut (12) and the upper housing (1).

5. An engine crankcase according to claim 4, characterized in that, The first groove (5) and the second groove (6) are respectively opened between two adjacent first fastening holes (13) and second fastening holes (14).

6. The engine crankcase according to claim 1, characterized in that, The sealing assembly includes: Upper annular groove (15): The upper box (1) is provided with an upper annular groove (15) on the side near the lower box (2). The lower annular groove (16) is provided on the side of the lower box (2) near the upper box (1) to match the upper annular groove (15). The first sealing ring (17) is embedded between the upper annular groove (15) and the lower annular groove (16).

7. An engine crankcase according to claim 6, characterized in that, The sealing assembly further includes: A mating flange (18) is provided on the side wall of the lower housing (2). A sealing groove (19) is provided on the upper surface of the mating flange (18); The second sealing ring (20) is provided on the sealing groove (19).

8. An engine crankcase according to claim 7, characterized in that, The mating flange (18) includes two connecting arms (21) and a connecting plate. The sealing groove (19) is formed by two parallel connecting arms (21) and a connecting plate vertically arranged between the two connecting arms (21). One of the connecting arms (21) is fixedly connected to the side wall of the lower box (2), and the end of the other connecting arm (21) is fixedly connected to a transverse connecting rib (22). A longitudinal connecting rib (23) is connected to one side of the transverse connecting rib (22).

Images