An oil seal structure for an automobile engine

Abstract

This utility model relates to the field of oil seal technology, and discloses an oil seal structure for automobile engines. An oil seal structure for automobile engines includes: a base plate with a through-hole for the rear end of the crankshaft of the automobile engine to pass through; a sealing lip structure on the inner side of the through-hole for sealing the gap between the rear end of the crankshaft and the through-hole; and a sealing ring structure disposed on the back of the base plate, comprising an annular sealing rib, the through-hole being located inside the annular sealing rib, and at least two annular protrusions arranged at intervals from the inside to the outside on the annular sealing rib. During use, the cylinder block of the automobile engine compresses the two annular protrusions. Beneficial effects: It improves the sealing effect of the oil seal structure, reduces oil leakage during use, reduces maintenance frequency, and extends the service life of the automobile engine.

Description

Technical Field

[0001] This utility model relates to the field of oil seal technology, and in particular to an oil seal structure for automobile engines. Background Technology

[0002] A car engine includes a cylinder block and a crankshaft and balance shaft mounted on the cylinder block. The rear ends of the crankshaft and balance shaft extend out of the cylinder block. Since the crankshaft and balance shaft rotate at high speeds during operation, they both require lubrication. To prevent lubrication leakage, an oil seal is installed at the rear end of the cylinder block to surround the rear ends of the crankshaft and the portions of the balance shaft that extend out of the cylinder block.

[0003] The oil seal structure includes a base plate with an oil cover surface, which faces the cylinder body during use. A sealing ring is located on the oil cover surface; during use, the sealing ring is pressed against the cylinder body by the oil cover surface, sealing the lubricating oil.

[0004] However, in actual use, due to machining errors and other factors, the surface of the cylinder block may become uneven, or even have noticeable protrusions. If, during installation, the sealing rib of the sealing ring happens to correspond to the uneven surface or the noticeable protrusion, a significant gap may form between the sealing ring and the cylinder block surface, affecting the oil seal performance. Utility Model Content

[0005] The main purpose of this invention is to propose an oil seal structure for automobile engines, aiming to solve the technical problem that the sealing effect of the oil seal structure is easily affected when the cylinder block surface is uneven.

[0006] To achieve the above objectives, this utility model proposes an oil seal structure for an automobile engine, comprising: a base plate, on which a shaft hole is provided for the rear end shaft of the automobile engine crankshaft to pass through, and a sealing lip structure is provided on the inner side of the shaft hole for sealing the gap between the rear end shaft of the automobile engine crankshaft and the shaft hole; and a sealing ring structure, which is provided on the back side of the base plate, the sealing ring structure including annular sealing ribs, the shaft hole being located on the inner side of the annular sealing ribs, and at least two annular protrusions arranged sequentially from the inside to the outside on the annular sealing ribs, wherein, in use, the cylinder block of the automobile engine compresses the two annular protrusions.

[0007] The beneficial effects of this utility model are as follows: The oil seal structure of this utility model has at least two annular convex strips arranged from the inside out and at intervals in the annular sealing ribs of the sealing ring structure. During sealing, if the surface of the cylinder block of the car engine is uneven or even has obvious protrusions, a gap may be generated between one of the annular convex strips and the cylinder block of the car engine. However, the other annular convex strip is used for sealing to ensure the sealing effect of the oil seal structure. This is beneficial to improving the sealing effect of the oil seal structure, reducing the occurrence of oil leakage during use, reducing maintenance frequency, and extending the service life of the car engine.

[0008] Preferably, the back side of the substrate is provided with a first recessed portion, the first recessed portion having a first annular sidewall, the sealing ring structure being disposed inside the first annular sidewall and abutting against the first annular sidewall, the first annular sidewall can restrict the outward expansion of the sealing ring structure, can restrict the outward expansion of the sealing ring structure, avoid excessive stretching of the sealing ring structure, thereby extending the service life of the sealing ring structure.

[0009] Preferably, the sealing ring structure includes an outer ring structure, the outer side of which is connected to a first annular sidewall, and the inner side of which is connected to an annular sealing rib. The outer ring structure has a recessed portion on the side near the annular sealing rib. The annular sealing ring and the recessed portion enclose an annular clearance groove. In use, the annular clearance groove is used to accommodate the portion of the annular sealing rib that is squeezed outward, which helps to extend the service life of the annular sealing rib.

[0010] Preferably, the first recess is provided with a second recess, the second recess including a balance shaft accommodating area and a crankshaft accommodating area, and the through-shaft hole is located in the crankshaft accommodating area. In use, the crankshaft of the automobile engine is at least partially placed in the crankshaft accommodating area, and the balance shaft of the automobile engine is at least partially placed in the balance shaft accommodating area, which improves the fault tolerance and makes the oil seal structure more adaptable.

[0011] Preferably, a third recess is provided on the rear end receiving area of ​​the crankshaft, the through hole is located on the third recess, the third recess has a third annular sidewall, and the sealing lip structure includes an annular patch lip, the patch lip is located on the inner side of the third annular sidewall and abuts against the third annular sidewall, which is beneficial to strengthening the overall strength of the oil seal structure and extending its service life.

[0012] Preferably, the sealing lip structure further includes an annular dustproof lip, the dustproof lip including an annular connecting groove, the bottom plate of the third recess being annular, the shaft hole being located on the inner side of the annular bottom plate, the connecting groove extending along the edge of the shaft hole, and the bottom plate being engaged in the connecting groove; the connecting groove includes a first sidewall and a second sidewall, the first sidewall being located on the side of the bottom plate near the patch lip, the first sidewall abutting against the third annular sidewall, the patch lip being stacked on the first sidewall, and the second sidewall being located on the side of the bottom plate away from the patch lip, the patch lip, the dustproof lip and the substrate being fixedly connected to each other by vulcanization, which is beneficial to improving the sealing effect.

[0013] Preferably, the second recess is provided with a shaft head receiving groove, which is used to receive the shaft head of the balance shaft of the automobile engine, which helps to further reduce the volume occupied by the oil seal structure and facilitates installation.

[0014] Preferably, the inner and outer walls of the annular sealing rib are set at an angle, with the included angle α being 15°~25°, the width D1 of the upper side of the annular sealing rib being 0.8~1.2mm, the depth H1 of the annular clearance groove being 0.5~0.8mm, and the annular sealing rib protruding from the outer ring structure with a height difference H2 of 0.5~0.9mm, which is beneficial to extending the service life of the sealing ring structure.

[0015] Preferably, the substrate is further provided with a plurality of connection holes, which are arranged around the sealing ring structure and are used to connect the substrate and the cylinder block of the automobile engine. Attached Figure Description

[0016] 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 the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the oil seal structure in an embodiment of the present invention;

[0018] Figure 2 This is a rear view of the oil seal structure in an embodiment of this utility model;

[0019] Figure 3 for Figure 2 AA section view in the middle;

[0020] Figure 4 for Figure 3 A magnified view of part B in the middle section;

[0021] Figure 5 for Figure 3 A magnified view of part C in the middle;

[0022] Figure 6 This is a cross-sectional schematic diagram of the sealing ring structure in an embodiment of this utility model.

[0023] In the attached figures: 1-substrate, 11-first recess, 111-first annular sidewall, 12-second recess, 121-balance shaft receiving area, 1211-shaft head receiving groove, 122-crankshaft receiving area, 13-third recess, 131-third annular sidewall, 132-base plate, 14-connecting hole, 2-sealing ring structure, 21-outer ring structure, 22-annular clearance groove, 23-annular sealing rib, 231-annular protrusion, 3-sealing lip structure, 31-patch lip, 32-dustproof lip, 3211-first sidewall, 3212-second sidewall, 4-through shaft hole.

[0024] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] 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.

[0026] It should be noted that if the embodiments of this utility model involve directional indicators, such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0027] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0028] like Figures 1 to 6As shown, an oil seal structure for an automobile engine includes: a base plate 1, on which a shaft hole 4 is provided for the rear end shaft of the crankshaft of the automobile engine to pass through, and a sealing lip structure 3 is provided on the inner side of the shaft hole 4 for sealing the gap between the rear end shaft of the crankshaft of the automobile engine and the shaft hole 4; a sealing ring structure 2, which is provided on the back side of the base plate 1, the sealing ring structure 2 includes annular sealing ribs 23, the shaft hole 4 is located on the inner side of the annular sealing ribs 23, and at least two annular protrusions 231 are arranged sequentially from the inside to the outside on the annular sealing ribs 23. In use, the cylinder block of the automobile engine squeezes the two annular protrusions 231.

[0029] In this embodiment, the oil seal structure has an annular sealing rib 23 with at least two annular protrusions 231 arranged from the inside out and at intervals. During sealing, if the surface of the cylinder block of the car engine is uneven or even has obvious protrusions, a gap may be generated between one of the annular protrusions 231 and the cylinder block of the car engine. However, the other annular protrusion 231 is used for sealing to ensure the sealing effect of the oil seal structure. This is beneficial to improving the sealing effect of the oil seal structure, reducing the occurrence of oil leakage during use, reducing maintenance frequency, and extending the service life of the car engine.

[0030] In some specific embodiments, reference is made to Figure 1 and Figure 4 The back of the substrate 1 is provided with a first recess 11, the first recess 11 has a first annular sidewall 111, the sealing ring structure 2 is disposed on the inner side of the first annular sidewall 111 and abuts against the first annular sidewall 111, the first annular sidewall 111 can restrict the sealing ring structure 2 from expanding outward.

[0031] The first recess 11 provides a positioning function for the sealing ring structure 2 during its installation, which helps improve the assembly efficiency of the oil seal structure. During use, the cylinder head of the automotive engine compresses the sealing ring structure 2, potentially causing it to expand outwards and stretch. If the sealing ring structure 2 remains under tension for an extended period, its sealing performance will deteriorate rapidly. The first annular sidewall 111 restricts the outward expansion of the sealing ring structure 2, preventing excessive stretching and thus extending its service life.

[0032] In some specific embodiments, reference is made to Figure 4 The sealing ring structure 2 includes an outer ring structure 21. The outer side of the outer ring structure 21 is connected to the first annular sidewall 111, and the inner side of the outer ring structure 21 is connected to the annular sealing rib 23. The outer ring structure 21 has a recessed part on the side near the annular sealing rib 23. The annular sealing ring and the recessed part form an annular clearance groove 22. In use, the annular clearance groove 22 is used to accommodate the part of the annular sealing rib 23 that is squeezed outward.

[0033] When the oil seal structure seals the automobile engine, the engine compresses the annular sealing rib 23. In this embodiment, the inner space of the annular sealing rib 23 is sufficient, allowing for adequate deformation of the inner portion if the annular sealing rib 23 is compressed. The annular clearance groove 22 ensures that the outer portion of the annular sealing rib 23 also has sufficient space to deform, accommodating the outward expansion of the compressed portion. This prevents excessive stress on the interior of the annular sealing rib 23 even when compressed by the engine block, thus extending its service life.

[0034] In some specific embodiments, reference is made to Figures 1 to 3 The first recess 11 is provided with a second recess 12. The second recess 12 includes a balance shaft receiving area 121 and a crankshaft receiving area 122. The through-shaft hole 4 is located in the crankshaft receiving area 122. In use, the crankshaft of the automobile engine is at least partially placed in the crankshaft receiving area 122, and the balance shaft of the automobile engine is at least partially placed in the balance shaft receiving area 121.

[0035] In this embodiment, the depth of the first recess 11 is insufficient to accommodate the portion of the balance shaft and the crankshaft rear end that protrudes from the engine block. The second recess 12 is provided so that the balance shaft and the crankshaft rear end can be sealed simultaneously, which helps to reduce the volume of the oil seal structure, facilitates installation, and saves materials.

[0036] In some existing technologies, the oil seal structure has two independent recesses to seal the balance shaft and the rear end of the crankshaft, respectively. This design requires high accuracy in positioning the recesses and has a low tolerance for error during installation. In this embodiment, a second recess 12 is used to seal both the balance shaft and the rear end of the crankshaft simultaneously, which allows for some manufacturing errors, improves the tolerance for error, and makes the oil seal structure more adaptable.

[0037] In some specific embodiments, reference is made to Figure 1 and Figure 5 A third recess 13 is provided on the rear end accommodating area of ​​the crankshaft, and the shaft hole 4 is located on the third recess 13. The third recess 13 has a third annular sidewall 131. The sealing lip structure 3 includes an annular patch lip 31. The patch lip is located on the inner side of the third annular sidewall 131 and abuts against the third annular sidewall 131.

[0038] The third recess 13 is provided, and the third annular sidewall 131 of the third recess 13 is used to position the patch lip 31, which is beneficial to improving production assembly efficiency.

[0039] In this embodiment, the first recess 11 is used to install the sealing ring structure 2, the second recess 12 is used to accommodate the rear end of the crankshaft of the automobile engine, and the third recess 13 is used to install the sealing lip structure 3. The three recesses are designed in a targeted manner, which helps to reduce the volume occupied by the oil seal structure and facilitates installation. Moreover, the annular sidewall structure provided on each recess helps to strengthen the overall strength of the oil seal structure and extend its service life.

[0040] In some specific embodiments, reference is made to Figure 5 The sealing lip structure 3 also includes an annular dustproof lip 32, which includes an annular connecting groove. The bottom plate 132 of the third recess 13 is annular, and the shaft hole 4 is located inside the annular bottom plate 132. The connecting groove extends along the edge of the shaft hole 4, and the bottom plate 132 is engaged in the connecting groove. The connecting groove includes a first sidewall 3211 and a second sidewall 3212. The first sidewall 3211 is located on the side of the bottom plate 132 near the patch lip 31. The first sidewall 3211 abuts against the third annular sidewall 131. The patch lip is stacked on the first sidewall 3211. The second sidewall 3212 is located on the side of the bottom plate 132 away from the patch lip 31. The patch lip 31, the dustproof lip 32, and the substrate 1 are fixedly connected to each other by vulcanization.

[0041] Compared to the existing technology where the patch lip 31 and the dustproof lip 32 are separately disposed on the substrate 1, in this embodiment, the patch lip 31, the dustproof lip 32 and the substrate 1 are fixedly connected to each other, so that the sealing lip structure 3 can be firmly connected to the substrate, which is beneficial to improving the sealing effect.

[0042] In some specific embodiments, reference is made to Figure 1 and Figure 2 The second recess 12 is provided with a shaft head receiving groove 1211, which is used to receive the shaft head of the balance shaft of the automobile engine.

[0043] The shaft head receiving groove 1211 is provided to reduce the depth of the second recess 12, reduce the amount of material used in the production of the substrate 1, and further reduce the volume occupied by the oil seal structure, making installation easier.

[0044] In some specific embodiments, reference is made to Figure 6 The inner and outer walls of the annular sealing rib 23 are set at an angle, with the included angle α being 15°~25°. The width D1 of the upper side of the annular sealing rib 23 is 0.8~1.2mm. The depth H1 of the annular clearance groove 22 is 0.5~0.8mm. The annular sealing rib 23 protrudes from the outer ring structure 21 and the height difference H2 is 0.5~0.9mm.

[0045] The included angle α between the inner and outer walls of the annular sealing rib 23 is 15°~25°, which helps to concentrate the contact stress generated by compression on the two annular protrusions 231, thus improving the sealing effect. The width D1 of the upper side of the annular sealing rib 23 is 0.8~1.2mm, which is sufficient to accommodate the two annular protrusions 231 without separating them too much, thus ensuring the sealing effect. The depth H1 of the annular clearance groove 22 is 0.5~0.8mm, which helps to provide space for the annular sealing rib to be squeezed outward during the compression process, preventing excessive local internal stress from causing sealing failure. The annular sealing rib 23 protrudes from the outer ring structure 21 and the height difference H2 is 0.5~0.9mm, which can provide a reasonable compression ratio for the seal, while preventing sealing failure due to excessive compression, thus helping to extend the service life of the sealing ring structure 2.

[0046] In some specific embodiments, reference is made to Figure 1 The substrate 1 is also provided with a plurality of connection holes 14, which are arranged around the sealing ring structure 2. The connection holes 14 are used to connect the substrate 1 and the cylinder block of the automobile engine.

[0047] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An oil seal structure for an automobile engine, characterized in that: include: The substrate (1) has a through hole (4) for the rear end shaft of the crankshaft of the automobile engine to pass through. The inner side of the through hole (4) has a sealing lip structure (3) for sealing the gap between the rear end shaft of the crankshaft of the automobile engine and the through hole (4). A sealing ring structure (2) is provided on the back side of the substrate (1). The sealing ring structure (2) includes an annular sealing rib (23). The through hole (4) is located inside the annular sealing rib (23). The annular sealing rib (23) is provided with at least two annular protrusions (231) arranged sequentially from the inside to the outside. When in use, the cylinder block of the automobile engine squeezes the two annular protrusions (231).

2. The oil seal structure for an automobile engine according to claim 1, characterized in that: The substrate (1) has a first recess (11) on its back side. The first recess (11) has a first annular sidewall (111). The sealing ring structure (2) is located inside the first annular sidewall (111) and abuts against the first annular sidewall (111). The first annular sidewall (111) can restrict the sealing ring structure (2) from expanding outward.

3. The oil seal structure for an automobile engine according to claim 2, characterized in that: The sealing ring structure (2) includes an outer ring structure (21), the outer side of which is connected to the first annular sidewall (111), and the inner side of which is connected to the annular sealing rib (23). The outer ring structure (21) has a recessed portion on the side near the annular sealing rib (23). The annular sealing ring and the recessed portion enclose an annular clearance groove (22). In use, the annular clearance groove (22) is used to accommodate the portion of the annular sealing rib (23) that is squeezed outward.

4. The oil seal structure for an automobile engine according to claim 2, characterized in that: The first recess (11) is provided with a second recess (12), the second recess (12) includes a balance shaft receiving area (121) and a crankshaft receiving area (122), the through-shaft hole (4) is located in the crankshaft receiving area (122), and in use, the crankshaft of the automobile engine is at least partially placed in the crankshaft receiving area (122), and the balance shaft of the automobile engine is at least partially located in the balance shaft receiving area (121).

5. The oil seal structure for an automobile engine according to claim 4, characterized in that: The crankshaft rear end receiving area is provided with a third recess (13), the shaft hole (4) is located on the third recess (13), the third recess (13) has a third annular sidewall (131), the sealing lip structure (3) includes an annular patch lip (31), the patch lip is located on the inner side of the third annular sidewall (131) and abuts against the third annular sidewall (131).

6. The oil seal structure for an automobile engine according to claim 5, characterized in that: The sealing lip structure (3) also includes an annular dustproof lip (32), the dustproof lip (32) includes an annular connecting groove, the bottom plate (132) of the third recess (13) is annular, the through hole (4) is located inside the annular bottom plate (132), the connecting groove extends along the edge of the through hole (4), and the bottom plate (132) is engaged in the connecting groove; The connecting groove includes a first sidewall (3211) and a second sidewall (3212). The first sidewall (3211) is located on the side of the base plate (132) near the patch lip (31). The first sidewall (3211) abuts against the third annular sidewall (131). The patch lip is stacked on the first sidewall (3211). The second sidewall (3212) is located on the side of the base plate (132) away from the patch lip (31). The patch lip (31), the dustproof lip (32), and the substrate (1) are fixedly connected to each other by vulcanization.

7. The oil seal structure for an automobile engine according to claim 4, characterized in that: The second recess (12) is provided with a shaft head receiving groove (1211), which is used to receive the shaft head of the balance shaft of the automobile engine.

8. The oil seal structure for an automobile engine according to claim 3, characterized in that: The inner and outer walls of the annular sealing rib (23) are set at an angle, with the included angle a being 15°~25°. The width D1 of the upper side of the annular sealing rib (23) is 0.8~1.2mm. The depth H1 of the annular clearance groove (22) is 0.5~0.8mm. The annular sealing rib (23) protrudes from the outer ring structure (21) and the height difference H2 is 0.5~0.9mm.

9. The oil seal structure for an automobile engine according to claim 1, characterized in that: The substrate (1) is also provided with a plurality of connection holes (14), which are arranged around the sealing ring structure (2). The connection holes (14) are used to connect the substrate (1) and the cylinder block of the automobile engine.

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