Crankcase cover of gasoline engine

Abstract

The invention discloses a gasoline engine crankcase cover, and relates to the technical field of crankcase oil seal covers. Comprising a box cover main body piece, two limiting pieces are installed on the box cover main body piece, and two bolt limiting pieces are installed on the back of the box cover main body piece; the two limiting pieces are used for limiting the two bolt limiting pieces; the two bolt limiting pieces are used for prompting the mounting sequence of the first bolt; a coaxial limiting piece is mounted on the box cover main body piece; the coaxial limiting piece is used for being connected to a crankshaft in a sleeving mode. Two in-place shearing pieces are mounted on the box cover main body piece; by adopting a coaxial limiting piece, the installation coaxiality of the structure can be improved, the problem that a coaxial insertion cylinder cannot be pulled out due to large friction force generated by eccentricity is solved, at the moment, a coaxial ring is shielded outside, and a worker cannot carry out follow-up oil seal insertion work; the problems that according to an existing gasoline engine crankcase cover, the coaxial installation precision of workers is inconvenient to limit, and the shaft seal installation precision is poor are solved.

Description

Technical Field

[0001] The invention relates to the technical field of crankcase oil seal covers, in particular to a gasoline engine crankcase cover. Background Art

[0002] In hybrid vehicles, the engine is not used frequently, and when its oil seal ages too quickly, it will directly affect the engine operation quality and even cause oil leakage. The core function of the crankcase oil seal cover is to seal the crankshaft end, prevent lubricating oil leakage and isolate external contaminants from entering the crankcase. When the crankcase oil seal cover is actually installed, it is necessary to ensure standardized installation to ensure the quality of subsequent oil seal installation. When the current gasoline engine crankcase cover is tightened and installed, it is not convenient to remind the staff that the first bolt needs to be installed in the middle screw hole and then spread outward. The installation standardization is poor. At the same time, it is not convenient for users to understand the newness of the crankcase cover, which is not convenient for reducing the risk of reusing refurbished parts. It is also not convenient to limit the coaxial installation accuracy of the staff. There is a certain gap between the bolts of the crankcase cover. Direct and arbitrary tightening and installation will directly affect the coaxiality of the shaft seal installation, resulting in inconsistent pressure on the inner ring of the shaft seal, affecting the sealing effect. At the same time, it is not convenient to control and remind the staff to make adjustments before installing the shaft seal when the coaxial deviation exceeds the standard, and the shaft seal installation accuracy is poor.

[0003] For this purpose, we propose a gasoline engine crankcase cover. Summary of the Invention

[0004] The purpose of the present invention is to provide a gasoline engine crankcase cover to solve the problems raised in the above background technology that the current gasoline engine crankcase cover is not convenient for reducing the risk of reusing refurbished parts, and is also not convenient for limiting the coaxial installation accuracy of the staff and the shaft seal installation accuracy is poor.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a gasoline engine crankcase cover, comprising a crankcase cover body, two position limiting members mounted on the crankcase cover body, and two bolt limiting members mounted on the back of the crankcase cover body; the two position limiting members are used to limit the positions of the two bolt limiting members; the two bolt limiting members are used to indicate the installation order of the first bolt;

[0006] A coaxial limiting member is installed on the box cover main body; the coaxial limiting member is used to be sleeved on the crankshaft;

[0007] Two in-place shearing pieces are installed on the main body of the box cover; the two in-place shearing pieces are used to shear the coaxial limiting piece; a closing piece is installed on the inner side of the main body of the box cover; the closing piece is used to fit the oil seal;

[0008] The box cover main body comprises a crankshaft oil seal cover, and the crankshaft oil seal cover is provided with two rows of positioning holes.

[0009] Preferably, the case cover main body includes: a crankshaft hole, with three positioning holes in each row, a crankshaft hole in the middle of the crankshaft oil seal cover, and a thread on the inner side of the crankshaft hole; two sliding sockets are provided on the crankshaft oil seal cover, and the two sliding sockets are respectively located on the sides of the two positioning holes in the middle; two back grooves are provided on the back of the crankshaft oil seal cover, and the two back grooves are respectively rectangular structures; fastening bolts are respectively inserted into the six positioning holes, and the fastening bolts are used to threadedly connect the crankcase; a back plate is fixedly installed on the back of the crankshaft oil seal cover, and the back plate is attached to the side of the crankcase; six fastening bolts pass through the back plate respectively.

[0010] Preferably, the limiting component includes: a limiting block, and the limiting blocks are fixedly installed on the inner sides of the two back grooves respectively; and limiting grooves are respectively provided on the side surfaces of the two limiting blocks.

[0011] Preferably, the bolt limiting member includes: a limiting slider, and a limiting slider is slidably installed on the inner sides of the two back grooves; an extrusion slope is respectively opened in the middle of the two limiting sliders; the two extrusion slopes are respectively aligned with the positioning holes located in the middle of the two rows of positioning holes; six positioning holes are protruded from the sides of the two limiting sliders; the limiting slider is a rectangular structure; the extrusion slope is used to limit the installation position of the first fastening bolt; the two limiting sliders are respectively fixedly installed with retraction springs, and the retraction springs are V-shaped springs; the ends of the two retraction springs are respectively fixed on the inner sides of the back grooves; two limiting hooks are respectively fixedly installed on the sides of the two limiting sliders, and the limiting hooks are elastic steel sheet structures; the ends of the limiting hooks are thorn-shaped bending structures; the four limiting hooks are respectively aligned with the four limiting slots, and the four limiting slots are respectively used to snap into the four limiting slots.

[0012] Preferably, the coaxial limiting member includes: a coaxial insert, which is slidably inserted into the crankshaft oil seal cover; two through holes are provided on the coaxial insert; a coaxial ring is fixedly mounted on the coaxial insert; the coaxial ring is used to sleeve the exposed end of the crankshaft; the coaxial ring is used to improve the coaxiality of the crankshaft seal.

[0013] Preferably, the coaxial limiting member further includes: an anti-slip plastic shaft, wherein the two through holes on the coaxial insert are respectively fixedly plugged with an anti-slip plastic shaft; the two anti-slip plastic shafts are respectively plugged into the crankshaft oil seal cover; the anti-slip plastic shaft is located inside the sliding socket.

[0014] Preferably, the in-place shearing piece includes: a shearing extrusion block, in which the two sliding sockets are respectively slidably inserted with a shearing extrusion block; an extrusion cutting edge is provided on the side of the shearing extrusion block, and the extrusion cutting edge is attached to the anti-slip plastic shaft; the side of the extrusion cutting edge is attached to the outside of the coaxial insert; the nuts of the two fastening bolts are respectively used to extrude and push the shearing extrusion block to move toward the side of the anti-slip plastic shaft.

[0015] Preferably, the in-place shearing piece further comprises: a connecting spring, wherein connecting springs are fixedly mounted on the inner sides of the two shearing and extruding blocks respectively, and the ends of the two connecting springs are respectively connected to the two sliding sockets.

[0016] Preferably, the closing member comprises: a closing stop ring, which is threadedly connected to a thread provided on the inner side of the crankshaft hole; the closing stop ring is used to stop the oil seal.

[0017] Preferably, the sealing member further comprises: a liquid-absorbing sponge, which is an annular structure; the liquid-absorbing sponge is fixedly mounted on the inner ring of the closed stop ring; the liquid-absorbing sponge is used to fit on the surface of the oil seal; and the liquid-absorbing sponge is used to prevent dust.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention adopts a bolt limiter to remind the staff that when inserting the fastening bolts into the two rows of positioning holes, the staff is reminded that the first fastening bolt needs to be installed in the middle positioning hole. This structure uses a limiting slider to perform a limit stop. When the staff has not inserted the fastening bolt into the middle positioning hole, the fastening bolts cannot be inserted into the positioning holes on both sides to directly perform the fastening work. This can remind the staff to comply with the most basic installation specifications. The use of a bolt limiter in conjunction with a limiting member is more important in that after the limiting slider retracts, it can prevent it from rebounding and resetting. It can only be used once. In actual application, it can prevent industry personnel from reusing this structure, such as refurbishing parts and passing off inferior products as good ones.

[0020] When the crankshaft oil seal cover is installed, the crankshaft oil seal cover is in a stable state, which prevents the staff from directly removing the coaxial insert from using the coaxial ring and the crankshaft.

[0021] A closed stop ring can be used to limit the oil seal to prevent the oil seal from being directly pushed out when the oil pressure is too high due to oil leakage, thereby ensuring the stable position of the oil seal. At the same time, a liquid-absorbing sponge can be attached to the outside of the oil seal to prevent dust and absorb leaked oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of a gasoline engine crankcase cover of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the closure member of the present invention;

[0024] Figure 3 This is a schematic diagram of the back groove position of the present invention;

[0025] Figure 4 This is a schematic structural diagram of the box cover main body of the present invention;

[0026] Figure 5 For the present invention Figure 3 A magnified view of the structure of the middle A area;

[0027] Figure 6 This is a schematic diagram of the structure of the bolt limiter of the present invention;

[0028] Figure 7 This is a schematic diagram of the installation position of the limiting slider of the present invention;

[0029] Figure 8 This is a schematic structural diagram of the coaxial limiting member of the present invention;

[0030] Figure 9 This is a schematic diagram of the structure of the closure member of the present invention;

[0031] Figure 10 For the present invention Figure 9 A magnified view of the structure of the middle C region;

[0032] Figure 11 This is a structural schematic diagram of the in-place shearing piece of the present invention.

[0033] In the figure: 1. Box cover main body; 101. Crankshaft oil seal cover; 1011. Positioning hole; 1012. Crankshaft hole; 1013. Sliding socket; 1014. Back groove; 102. Fastening bolt; 103. Back plate; 2. Limiting member; 201. Limiting block; 2011. Limiting groove; 3. Bolt limiting member; 301. Limiting slider; 3011. Extrusion slope; 302. Retraction spring; 303. Limiting hook; 4. Coaxial limiting member; 401. Coaxial insert; 4011. Coaxial ring; 402. Anti-slip plastic shaft; 5. In-place shearing member; 501. Shearing extrusion block; 502. Extrusion cutting edge; 503. Connecting spring; 6. Closing member; 601. Closing stop ring; 602. Absorbent sponge. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] Example 1: Please refer to Figures 1 to 11 As shown:

[0036] The present invention provides a technical solution: a gasoline engine crankcase cover, including a cover body 1, two limit members 2 are installed on the cover body 1, and two bolt limit members 3 are installed on the back of the cover body 1; the two limit members 2 are used to limit the two bolt limit members 3; the two bolt limit members 3 are used to prompt the installation order of the first bolt; a coaxial limit member 4 is installed on the cover body 1; the coaxial limit member 4 is used to be sleeved on the crankshaft; two in-place shearing members 5 are installed on the cover body 1; the two in-place shearing members 5 are used to shear off the coaxial limit member 4; a closing member 6 is installed on the inner side of the cover body 1; the closing member 6 is used to fit the oil seal; the cover body 1 includes: a crankshaft oil seal cover 101 and a positioning hole 1011, and two rows of positioning holes 1011 are opened on the crankshaft oil seal cover 101.

[0037] The main body 1 of the box cover includes: a crankshaft hole 1012, a sliding socket 1013, a back groove 1014, a fastening bolt 102 and a back plate 103. There are three positioning holes 1011 in each row. The crankshaft oil seal cover 101 is provided with a crankshaft hole 1012 in the middle, and the inner side of the crankshaft hole 1012 is provided with a thread; the crankshaft oil seal cover 101 is provided with two sliding sockets 1013, and the two sliding sockets 1013 are respectively located on the sides of the two positioning holes 1011 in the middle; the crankshaft oil seal cover 101 is provided with two The back groove 1014 is a rectangular structure, and the two back grooves 1014 are respectively connected with fastening bolts 102, and the fastening bolts 102 are used to thread the crankcase; the back of the crankshaft oil seal cover 101 is fixedly installed with a back plate 103, and the back plate 103 is attached to the side of the crankcase; the six fastening bolts 102 pass through the back plate 103 respectively; the limiting member 2 includes: a limiting block 201 and a limiting groove 2011, and the inner sides of the two back grooves 1014 are respectively fixed with the limiting blocks 201; the two limiting blocks The side of the two limiting blocks 301 is provided with a limit groove 2011; the bolt limiting member 3 includes: a limit slider 301, an extrusion slope 3011, a retraction spring 302 and a limit hook 303, and the two back grooves 1014 are respectively slidably mounted with the limit sliders 301; the middle of the two limiting blocks 301 is provided with an extrusion slope 3011; the two extrusion slopes 3011 are respectively aligned with the positioning holes 1011 in the middle of the two rows of positioning holes 1011; the six positioning holes 1011 protrude from the sides of the two limiting blocks 301 11; The limiting slider 301 is a rectangular structure; the extrusion slope 3011 is used to limit the installation position of the first fastening bolt 102; the two sides of the limiting sliders 301 are respectively fixedly installed with retractable springs 302, and the retractable springs 302 are V-shaped springs; the ends of the two retractable springs 302 are respectively fixedly installed on the inner sides of the back groove 1014; the two sides of the limiting sliders 301 are respectively fixedly installed with two limiting hooks 303, and the limiting hooks 303 are elastic steel sheet structures; the ends of the limiting hooks 303 are thorn-shaped bent structures;The four limiting hooks 303 are aligned with the four limiting slots 2011 respectively, and the four limiting slots 2011 are used to snap into the four limiting slots 2011 respectively. The bolt limiting member 3 can be used to remind the staff that when inserting the fastening bolts 102 into the two rows of positioning holes 1011, the staff is reminded that the first fastening bolt 102 needs to be installed in the middle positioning hole 1011. This structure uses the limiting slider 301 for limit stopping. When the staff does not insert the fastening bolt 102 into the middle positioning hole 1011, the positioning holes 1011 on both sides thereof cannot be inserted. Inserting the fastening bolt 102 and tightening it directly can remind the staff to comply with the most basic installation specifications. When the staff finds that the fastening bolt 102 cannot be inserted, they can make adjustments in time, and it is easier to maintain the specification requirements during subsequent installation work. Because the first bolt tightened in the middle can provide an initial pre-tightening force for the connecting component, forming a stable reference point, ensuring that the pressure on both sides is symmetrically distributed during the subsequent tightening process, if the bolts at both ends are tightened first, the component may form a bow-shaped bend due to the force on one side, resulting in failure of the seal in the middle area; and the middle priority tightening can directly eliminate the maximum gap. At the same time, the use of the bolt limiter 3 and the limiter 2 is more important in that after the limiting slider 301 retracts, it can prevent it from rebounding and resetting. It can only be used once, which can prevent industry personnel from reusing this structure in actual application, such as refurbishing parts and passing them off as good ones. After the box cover main body 1 is repaired, installed and disassembled, if it is used again, the user or staff can directly observe the position of the limiting slider 301 to ensure that the limiting slider 301 is used for the first time, that is, the limiting slider 301 is located inside the two rows of positioning holes 1011. If the worker When the operator first inserts the fastening bolt 102 into the positioning holes 1011 located on the upper and lower sides of the two rows of positioning holes 1011, the fastening bolt 102 cannot squeeze the provided squeezing slope 3011, but is stopped by the flat limiting slider 301, which serves as a reminder to the operator. At the same time, when the limiting slider 301 retracts, it drives the limiting hook 303 to move and insert into the limiting groove 2011, allowing it to be hung and limited, and unable to extend again, achieving one-way positioning. This reminds the operator that the limiting slider 301 has been used once, and it is necessary to be careful whether it is brand new.

[0038] Among them, the coaxial limiting member 4 includes: a coaxial insert 401 and a coaxial ring 4011, the coaxial insert 401 is slidably inserted into the crankshaft oil seal cover 101; the coaxial insert 401 is provided with two through holes; a coaxial ring 4011 is fixedly installed on the coaxial insert 401; the coaxial ring 4011 is used to sleeve the exposed end of the crankshaft; the coaxial ring 4011 is used to improve the coaxiality of the crankshaft seal; the coaxial limiting member 4 also includes: an anti-slip plastic shaft 402, the two through holes on the coaxial insert 401 are respectively fixedly inserted with an anti-slip plastic shaft 402; the two anti-slip plastic shafts 402 are respectively inserted into On the crankshaft oil seal cover 101; the anti-slip plastic shaft 402 is located inside the sliding socket 1013; the in-place shearing piece 5 includes: a shearing extrusion block 501 and an extrusion cutting edge 502, and the two sliding sockets 1013 are respectively slidably inserted with the shearing extrusion blocks 501; the side of the shearing extrusion block 501 is provided with an extrusion cutting edge 502, and the extrusion cutting edge 502 is attached to the anti-slip plastic shaft 402; the side of the extrusion cutting edge 502 is attached to the outside of the coaxial insert 401; the nuts of the two fastening bolts 102 are respectively used to squeeze and push the shearing extrusion block 501 to move toward the side of the anti-slip plastic shaft 402;The in-place shearing piece 5 also includes: a connecting spring 503, and the connecting spring 503 is fixedly installed on the inner side of the two shearing extrusion blocks 501, and the ends of the two connecting springs 503 are respectively connected to the two sliding sockets 1013. The in-place shearing piece 5 is used in conjunction with the coaxial limiting piece 4 to improve the coaxiality of the structure during actual installation, so as to avoid the large gap between the fastening bolt 102 and the positioning hole 1011, which may cause the crankshaft hole 1012 and the crankshaft to deviate from each other after the crankshaft oil seal cover 101 is installed. The difference is large, and the corresponding problem of the installation accuracy requirement cannot be met after the oil seal is installed. The coaxial ring 4011 can be directly and tightly sleeved on the end of the crankshaft to increase the installation accuracy. At the same time, this structure can use the coaxial ring 4011. When the tightening bolt 102 is actually tightened, if the crankshaft oil seal cover 101 has a displacement deviation, once the coaxial ring 4011 and the crankshaft concentricity deviation is large, the inner side of the coaxial ring 4011 will be tightly fitted to the outer side of the crankshaft, and the eccentricity will generate a large friction force, which will cause the coaxial insert 401 The problem of being unable to be pulled out, at this time the coaxial ring 4011 is blocked outside, and the staff cannot perform the subsequent insertion of the oil seal. In this way, the restriction is performed to improve the installation accuracy of the oil seal. The coaxial restriction member 4 used in this structure is matched with the shear member 5 in place to ensure that when the staff removes the coaxial ring 4011, at least the fastening bolts 102 on the positioning holes 1011 on both sides are tightened and installed, and the crankshaft oil seal cover 101 is in a stable state, avoiding the staff from directly removing the coaxial insert 401 without using it, which can be further standardized. The coaxial installation is precise and easy to operate. As the fastening bolt 102 is tightened, the fastening bolt 102 on the same side as the shearing extrusion block 501 is tightened. The nut squeezes and shears the extrusion block 501, driving the extrusion blade 502 to press down and shear the anti-slip plastic shaft 402. At this time, the coaxial insert 401 can be directly withdrawn and the oil seal can be inserted into the crankshaft hole 1012 for installation. However, if the coaxiality difference between the coaxial ring 4011 and the crankshaft is too large at this time, friction will naturally increase, and the inside of the coaxial ring 4011 will stick to the crankshaft, making it impossible to withdraw.

[0039] Example 2. On the basis of Example 1, the closing member 6 includes: a closed stop ring 601, which is threadedly connected to the thread provided on the inner side of the crankshaft hole 1012; the closed stop ring 601 is used to stop the oil seal; the closing member 6 also includes: a liquid-absorbing sponge 602, which is a ring-shaped structure; the liquid-absorbing sponge 602 is fixedly installed on the inner ring of the closed stop ring 601; the liquid-absorbing sponge 602 is used to fit on the surface of the oil seal; the liquid-absorbing sponge 602 is used to prevent dust, and the closed stop ring 601 can be used to limit the oil seal to prevent the oil seal from being directly ejected when the oil pressure is too high when leaking oil, thereby ensuring the stability of the oil seal position. At the same time, the liquid-absorbing sponge 602 can be fitted on the outside of the oil seal to prevent dust and absorb the leaked oil to improve the cleanliness of the crankshaft end.

[0040] The working principle of this embodiment is as follows: first, the back plate 103 is attached to the side of the crankcase, and then the fastening bolts 102 can be inserted into the two positioning holes 1011 in the middle, and tightened into the threaded holes reserved on the crankcase for installation. At this time, the fastening bolts 102 can squeeze the set extrusion slope 3011 and push the limiting slider 301 to retract. At this time, the two sides of the limiting slider 301 will also be withdrawn from the positioning holes 1011 and no longer stop. At this time, the fastening bolts 102 can be installed in sequence from the middle to the outside. On the contrary, if the work When the operator first inserts the fastening bolt 102 into the positioning holes 1011 on the upper and lower sides of the two rows of positioning holes 1011, the fastening bolt 102 cannot be squeezed inward by the extrusion inclined surface 3011, but is stopped by the flat limiting slider 301, which can serve as a reminder to the operator; during normal installation, when the limiting slider 301 retracts, it drives the limiting hook 303 to move together and insert into the limiting groove 2011, and the thorn-shaped spring piece structure of the limiting hook 303 can be used for hanging and limiting, realizing one-way positioning and limiting. The limiting slider 301 cannot be extended subsequently, which can be used to remind that the limiting slider 301 has been used once, and it is necessary to be vigilant whether it is brand new. When installing the crankshaft oil seal cover 101, the coaxial ring 4011 is inserted into the crankshaft for positioning. At this time, the anti-stripping plastic shaft 402 is inserted into the crankshaft oil seal cover 101. The coaxial insert 401 cannot be directly disassembled, but as the fastening bolt 102 is tightened and installed, the fastening bolt 102 on the same side of the shearing extrusion block 501 is tightened. At this time, its nut will squeeze and cut the extrusion block 501, driving the extrusion cutting edge 502 to move. Press down to cut off the anti-slip plastic shaft 402. At this time, you can directly pull out the coaxial insert 401 and insert the oil seal into the crankshaft hole 1012 for installation. However, if the coaxiality difference between the coaxial ring 4011 and the crankshaft is too large at this time, the friction will naturally increase, and the coaxial ring 4011 will stick to the crankshaft and cannot be pulled out. You need to loosen the fastening bolt 102 for adjustment. After pulling out the coaxial ring 4011, insert the oil seal into the crankshaft and the crankshaft hole 1012, and then manually screw the closed stop ring 601 on the crankshaft hole 1012 to limit the position of the oil seal.

[0041] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0042] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A gasoline engine crankcase cover, comprising a cover body (1), two stoppers (2) being mounted on the cover body (1), and characterized in that: Two bolt limiting members (3) are installed on the back of the box cover main body (1); the two limiting members (2) are used to limit the two bolt limiting members (3); the two bolt limiting members (3) are used to prompt the installation order of the first bolt; A coaxial limiting member (4) is installed on the box cover main body (1); the coaxial limiting member (4) is used for sleeve connection on the crankshaft; Two in-place shearing pieces (5) are installed on the box cover main body (1); the two in-place shearing pieces (5) are used to shear off the coaxial limiting piece (4); a closing piece (6) is installed on the inner side of the box cover main body (1); the closing piece (6) is used to fit the oil seal; The box cover main body (1) comprises a crankshaft oil seal cover (101), and two rows of positioning holes (1011) are provided on the crankshaft oil seal cover (101).

2. A gasoline engine crankcase cover according to claim 1, characterized in that: The box cover main body (1) comprises: a crankshaft hole (1012), three positioning holes (1011) are provided in each row, a crankshaft hole (1012) is provided in the middle of the crankshaft oil seal cover (101), and a thread is provided on the inner side of the crankshaft hole (1012); two sliding insertion holes (1013) are provided on the crankshaft oil seal cover (101), and the two sliding insertion holes (1013) are respectively located on the sides of the two positioning holes (1011) in the middle; the crankshaft oil seal cover Two back grooves (1014) are provided on the back of (101), and the two back grooves (1014) are respectively rectangular structures; the six positioning holes (1011) are respectively plugged with fastening bolts (102), and the fastening bolts (102) are used for threaded connection with the crankcase; a back plate (103) is fixedly installed on the back of the crankshaft oil seal cover (101), and the back plate (103) is attached to the side of the crankcase; the six fastening bolts (102) respectively pass through the back plate (103).

3. A gasoline engine crankcase cover according to claim 2, characterized in that: The limiting member (2) comprises: a limiting block (201), the limiting blocks (201) being fixedly mounted on the inner sides of the two back grooves (1014); and limiting grooves (2011) being respectively provided on the side surfaces of the two limiting blocks (201).

4. A gasoline engine crankcase cover according to claim 3, characterized in that: The bolt limiting member (3) comprises: a limiting slider (301), wherein the limiting sliders (301) are respectively slidably installed on the inner sides of the two back grooves (1014); an extrusion inclined surface (3011) is respectively opened in the middle of the two limiting sliders (301); the two extrusion inclined surfaces (3011) are respectively aligned with the positioning holes (1011) located in the middle of the two rows of positioning holes (1011); six positioning holes (1011) are respectively protruded from the sides of the two limiting sliders (301); the limiting slider (301) is a rectangular structure; the extrusion inclined surface (3011) is used to limit the installation position of the first fastening bolt (102); the two The side surfaces of the limiting slider (301) are respectively fixedly mounted with retractable spring pieces (302), and the retractable spring pieces (302) are V-shaped spring pieces; the ends of the two retractable spring pieces (302) are respectively fixedly mounted on the inner sides of the back groove (1014); the sides of the two limiting sliders (301) are respectively fixedly mounted with two limiting hooks (303), and the limiting hooks (303) are elastic steel sheet structures; the ends of the limiting hooks (303) are thorn-shaped bending structures; the four limiting hooks (303) are respectively aligned with the four limiting grooves (2011), and the four limiting grooves (2011) are respectively used to be clamped into the four limiting grooves (2011).

5. The gasoline engine crankcase cover according to claim 2, characterized in that: The coaxial limiting member (4) comprises: a coaxial insert (401), the coaxial insert (401) being slidably inserted into the crankshaft oil seal cover (101); two through holes being provided on the coaxial insert (401); a coaxial ring (4011) being fixedly mounted on the coaxial insert (401); the coaxial ring (4011) being used for sleeve-engaging the exposed end of the crankshaft; and the coaxial ring (4011) being used for improving the coaxiality of the crankshaft seal.

6. The gasoline engine crankcase cover according to claim 5, characterized in that: The coaxial limiting member (4) further comprises: an anti-slip plastic shaft (402), wherein the two through holes on the coaxial insert (401) are respectively fixedly plugged with the anti-slip plastic shaft (402); the two anti-slip plastic shafts (402) are respectively plugged into the crankshaft oil seal cover (101); and the anti-slip plastic shaft (402) is located inside the sliding insertion hole (1013).

7. The gasoline engine crankcase cover according to claim 6, characterized in that: The in-place shearing piece (5) comprises: a shearing extrusion block (501), wherein the shearing extrusion blocks (501) are respectively slidably inserted into the two sliding sockets (1013); a side surface of the shearing extrusion block (501) is provided with an extrusion cutting edge (502), and the extrusion cutting edge (502) is attached to the anti-slip plastic shaft (402); a side surface of the extrusion cutting edge (502) is attached to the outside of the coaxial insert (401); and the nuts of the two fastening bolts (102) are respectively used for extruding and pushing the shearing extrusion block (501) to move toward one side of the anti-slip plastic shaft (402).

8. The gasoline engine crankcase cover according to claim 7, characterized in that: The in-place shearing piece (5) further comprises: a connecting spring (503), the inner sides of the two shearing extrusion blocks (501) are respectively fixedly mounted with a connecting spring (503), and the ends of the two connecting springs (503) are respectively connected to the two sliding sockets (1013).

9. The gasoline engine crankcase cover according to claim 2, characterized in that: The closing member (6) comprises a closing stop ring (601), wherein the closing stop ring (601) is threadedly connected to a thread provided on the inner side of the crankshaft hole (1012); the closing stop ring (601) is used to stop the oil seal.

10. The gasoline engine crankcase cover according to claim 9, characterized in that: The sealing member (6) further comprises: a liquid-absorbing sponge (602), the liquid-absorbing sponge (602) being an annular structure; the liquid-absorbing sponge (602) being fixedly mounted on the inner ring of the sealing stop ring (601); the liquid-absorbing sponge (602) being adapted to be attached to the surface of the oil seal; and the liquid-absorbing sponge (602) being adapted to prevent dust.

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