CN113175390A - Engine crankcase return oil collecting structure - Google Patents

Abstract

The invention provides an engine crankcase return oil collecting structure, and belongs to the technical field of engines. It has solved the technical problem that the interior machine oil of current engine crankcase is difficult to smooth and easy oil return. This structure is collected to engine crankcase oil return, the engine includes box and oil pan down, the bottom of box has set firmly the baffle down, the baffle surrounds from the below and the inside wall of oil gallery and forms oil return passageway, oil return passageway level sets up and one end and oil return opening intercommunication, the top of oil pan has the oil absorption mouth with the oil pump intercommunication, the other end and the oil absorption mouth intercommunication of this oil return passageway, the lower box structure of oil gallery port department leans on with the border of oil absorption mouth is sealed, the junction at baffle and oil absorption mouth border is equipped with the elastic cushion, the both sides limit of elastic cushion is the sealed side wall of this oil gallery respectively and is leaned on, the bottom surface of this sealed elastic cushion leans on with the border of baffle and oil absorption mouth simultaneously and seals. The invention can ensure the oil return effect of the engine oil under the condition of controlling the process cost.

Description

Engine crankcase return oil collecting structure

Technical Field

The invention belongs to the technical field of motorcycle engines, and relates to an engine crankcase return oil collecting structure.

Background

The engine lubricating system sucks lubricating oil from an oil pool at the bottom of a crankcase through an oil pump, the lubricating oil enters the oil pump through a coarse filter and an oil suction pore passage, the lubricating oil is pressurized by the oil pump and then is subjected to pressure regulation through a pressure limiting device, a small amount of redundant oil after pressure regulation returns to the oil pool at the bottom, and the rest most of the redundant oil enters a main oil passage of an engine body and then enters an oil filter arranged on the engine body for filtering, and then the filtered oil returns to all parts of the engine body.

Chinese patent application publication No. CN101915138A discloses an oil suction port device of an oil pump of a diesel engine, which comprises an oil suction port coarse filter, an oil suction pipe and a rotary sleeve mechanism, wherein the oil suction pipe comprises an upper oil suction pipe and a lower oil suction pipe, and the lower end of the oil suction pipe is fixedly connected with the oil suction port coarse filter; the lower end of the upper oil suction pipe and the upper end of the lower oil suction pipe are respectively bent by 90 degrees, the rotating sleeve mechanism comprises an inner sleeve and an outer sleeve, the inner sleeve is rotatably sleeved in the outer sleeve, one end of the inner sleeve is fixedly connected with the upper end of the lower oil suction pipe, and one end of the outer sleeve is fixedly connected with the lower end of the upper oil suction pipe.

In order to solve the problems, general technicians in the field easily consider 1, for example, increasing the vertical distance between a crankshaft and the lower part of a crankshaft chamber and avoiding the direct contact between the crank arm and the accumulated engine oil; 2. oil passages communicated to the oil filter are arranged in the side walls of the different crank chambers.

Disclosure of Invention

The invention provides an engine crankcase return oil collecting structure aiming at the problems in the prior art, and the technical problems to be solved by the invention are as follows: how to ensure the oil return effect of the engine oil under the condition of controlling the process cost.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides an engine crankcase oil return collects structure, the engine includes lower box and oil pan, has a plurality of crank chamber in this lower box, its characterized in that, oil return collection structure include a plurality of oil return openings that are located crank chamber bottom and be located the oil gallery of lower box bottom surface, the bottom of box has set firmly the baffle down, the baffle from the below with the inside wall of oil gallery surrounds and forms oil return passageway, oil return passageway level sets up and one end with the oil return opening intercommunication, the top of oil pan has the oil absorption mouth that communicates with the oil pump, the other end of this oil return passageway with oil absorption mouth intercommunication, the lower box structure of oil gallery port department with the sealed support in border of oil absorption mouth supports, the junction on baffle and oil absorption mouth border is equipped with the elastic cushion piece, the both sides limit of elastic cushion piece should locate the oil gallery respectively the both sides wall of seal support and support, the bottom surface of the elastic sealing cushion block is simultaneously in sealing and abutting contact with the partition plate and the edge of the oil suction opening.

The bent axle of engine supports arranges in the box, for parts such as installation bent axle, but the box often includes upper box and lower box of split, and the middle part of lower box is provided with the support intensity that the baffle is used for guaranteeing the bent axle middle section, therefore the inner chamber of lower box is separated for a plurality of crank axle rooms, and the bottom and the oil pan of lower box are connected, and the oil pan is used for collecting the machine oil that the engine inner chamber flows down and circulates. The oil return collection structure comprises an oil return port positioned at the bottom of the crankshaft chamber and an oil return groove positioned at the bottom surface of the lower box body, and the bottom of the lower box body is provided with a partition plate which is encircled with the inner side wall of the oil return groove to form an oil return channel, so that one end of the oil return channel is horizontally arranged and communicated with the oil return port, and the other end of the oil return channel is communicated with the oil suction port in the oil pan; the oil suction port is communicated with the oil pump, when the oil pump works, low pressure can be formed in the area of the oil suction port, the lower box body structure arranged at the port of the oil return groove is in sealing abutting joint with the edge of the oil suction port, an elastic cushion block is arranged at the joint of the partition board and the edge of the oil suction port, so that two side edges of the elastic cushion block are respectively sealed and abutted by two side walls of an oil return groove at the joint, and the bottom surface is simultaneously sealed and abutted against the partition plate and the edge of the oil suction port, so that the elastic cushion block seals a matching gap between the partition plate and the edge of the oil suction port from the upper part to prevent engine oil from invading from the bottom of the elastic cushion block, and the two sides of the elastic cushion block are matched with the inner side wall of the oil return groove to prevent engine oil from entering the matching gap from the two sides, and the engine oil needs to sink from the top of the elastic cushion block and then enter the oil suction port after entering the oil return channel, so that the influence on the oil suction speed due to pressure loss caused by the assembly gap of the partition plate is avoided, and the engine oil return effect is ensured under the condition of controlling the process cost.

In foretell engine crankcase oil return collection structure, elastic cushion is discoid, the breach groove with this elastic cushion outer fringe shape adaptation is all seted up to the both sides wall of oil gallery, the downside in breach groove is uncovered, elastic cushion's both sides limit inlays to be located this breach inslot and follows vertical formation spacing. Be discoid through setting up elastic cushion block, and the breach groove with elastic cushion block outer fringe shape adaptation is all seted up to the both sides wall at the oil gallery, the downside in breach groove is uncovered, it is spacing just along vertical formation to inlay to locate the breach inslot on the both sides limit of messenger elastic cushion block, discoid be convenient for the assembler packs into the breach groove with arbitrary angle, and the breach groove passes through the installation that shape adaptation can guarantee elastic cushion block and seal position more accurate, the inside wall in breach groove and elastic cushion block's surface seal cooperation simultaneously, the restriction of elastic cushion block shape to the sealed length in both sides limit has been reduced, make elastic cushion block have more excellent sealed effect, and can improve the resistance effect to leading to sealed effect to reduce because of the local deformation of baffle, thereby guarantee the oil return effect.

In foretell engine crankcase oil return collection structure, the breach groove is located the port department of oil return tank, the one end in this breach groove along the horizontal direction towards oil absorption opening place one side is seted up. The port department that is located the oil gallery through setting up the breach groove makes the one end in breach groove set up towards oil absorption mouth place one side along the horizontal direction, and the port department bore of oil gallery is bigger like this, does benefit to and directly takes out the cushion along the horizontal direction from outer when needing to maintain the change to the cushion, and need not to dismantle the baffle, avoids influencing the sealed effect of baffle, guarantees that the oil return is smooth and easy.

In foretell engine crankcase oil return collection structure, be equipped with the coarse strainer that is used for filtering machine oil in the oil absorption mouth, the outer fringe of elastic cushion stretches out oil return passage just suspends in directly over the coarse strainer. The coarse strainer is used for filtering impurity particles in engine oil to avoid entering the engine oil pump to cause mechanism damage, the outer edge of the elastic cushion block extends out of the oil return channel and is suspended over the coarse strainer, therefore, the elastic cushion block can generate a better drainage effect, the engine oil can directly flow into the coarse strainer along the elastic cushion block under the action of tension after being submerged on the upper surface of the elastic cushion block, and smooth engine oil return is guaranteed.

In foretell engine crankcase oil return collection structure, still be equipped with the clamping ring in the oil absorption mouth, the clamping ring is pressed and is located the top of coarse strainer and with the oil absorption mouth inside wall links firmly, and the outer fringe of this clamping ring has the location breach, the outer fringe of cushion block can with location breach looks adaptation. The pressing ring is arranged in the oil suction port and pressed above the coarse filter screen and fixedly connected with the inner side wall of the oil suction port, the positioning notch is arranged at the outer edge of the pressing ring and matched with the outer edge of the extending part of the elastic cushion block, so that the position of the elastic cushion block can be limited by the pressing ring, the elastic cushion block is prevented from being separated from the oil return channel due to engine oil impact or vibration influence to cause sealing failure, and the structural stability is ensured.

In the oil return collecting structure of the engine crankcase, the partition plate comprises a fixed section and a cantilever section which can elastically deform along the vertical direction, and the cantilever section is vertically abutted against the elastic cushion block. Including the canned paragraph and can follow vertical elastic deformation's cantilever section through setting up the baffle, canned paragraph and the sealed laminating of lower box bottom surface, guarantee relatively fixed, it is just right to lean on with the cushion along vertical to make the cantilever section, a part of cushion receives the support of cantilever section like this, another part receives the support at oil absorption mouth border, like this because deformation is easier after the terminal atress of cantilever section, it can concentrate on the region that corresponds with cantilever section end with the part that the bottom is bloated to receive elastic extrusion after making the installation of cushion support, and the deformation of cantilever section initial end is very little this moment, and then it is minimum to the influence of the sealed effect of baffle with the cushion, guarantee oil return stability.

In the above-mentioned engine crankcase oil return collection structure, the partition plate is provided with a through oil leak hole. Through set up the oil leak hole on the baffle, accessible plugging member seals the oil leak hole when engine operation, and when needs were maintained, the accessible oil leak hole was discharged the long-pending machine oil that stays in the oil return passage, takes out the elastic cushion again, and it is convenient to make the maintenance.

In the engine crankcase oil return collection structure, the partition plate is fixedly connected with the bottom surface of the lower box body through a plurality of bolts, the bolts are arranged at intervals along the circumferential direction of the partition plate, and the cantilever section is located between the two bolts closest to the elastic cushion block. The baffle is fixedly connected with the bottom surface of the lower box body through a plurality of bolts, so that the cantilever section is positioned between the two bolts closest to the elastic cushion block, and the stable function of the cantilever section is ensured while the process cost is controlled.

In the engine crankcase oil return collecting structure, the edge of the elastic cushion block is subjected to chamfering transition treatment. The edges of the elastic cushion blocks are subjected to chamfering transition treatment, so that convenience of the elastic cushion blocks in the process of being installed into the notch groove from the lower side is guaranteed.

In the above-mentioned engine crankcase oil return collection structure, the elastic cushion block is a rubber material piece. Set up the elastic cushion and be rubber materials spare, do benefit to control material cost when guaranteeing sealed effect.

Compared with the prior art, the invention has the following advantages:

according to the engine crankcase oil return collection structure, the oil return port and the oil return groove are arranged, the partition plate is arranged to surround the inner side wall of the oil return groove to form the oil return channel, the oil return channel is horizontally arranged, one end of the oil return channel is communicated with the oil return port, the other end of the oil return channel is communicated with the oil suction port in the oil pan, so that oil return in the crankcase can directly flow into the oil return port after flowing to the bottom of the crankcase and flows into the oil suction port through the oil return channel, the phenomenon that oil stirring of a crank arm is caused by accumulation of engine oil at the bottom of the crankcase to influence the oil return effect is avoided, the horizontally arranged oil return groove is in an open shape due to being arranged on the bottom surface of the lower box body, and the processing cost such as internal opening is greatly saved; the joint of the partition plate and the edge of the oil suction opening is provided with the elastic cushion block for sealing, so that the oil return speed at the joint is prevented from being influenced by pressure loss caused by the assembly clearance between the partition plate and the outer side wall of the oil suction opening, and the oil return effect of engine oil is ensured under the condition of controlling the process cost.

Drawings

Fig. 1 is a schematic perspective view of the present embodiment.

Fig. 2 is a schematic perspective view of another angle in the present embodiment.

Fig. 3 is a schematic cross-sectional view of the present embodiment.

Fig. 4 is an enlarged view of a portion a in fig. 3.

Fig. 5 is a perspective view of a partial structure of the present embodiment.

Fig. 6 is an exploded view of a part of the structure of the present embodiment.

Fig. 7 is an enlarged view of a portion B in fig. 6.

Fig. 8 is an exploded view of the oil pan in this embodiment.

In the figure, 1, a lower box body; 11. a crankshaft chamber; 12. an oil return port; 13. an oil return groove; 131. a notch groove;

2. an oil pan; 21. an oil suction port;

3. a partition plate; 31. a fixed section; 32. a cantilever section; 33. an oil leak hole;

4. an oil return passage; 5. an elastic cushion block; 6. coarse filtration;

7. pressing a ring; 71. positioning the notch;

8. and (4) bolts.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1-8, in the crankcase oil return collecting structure of the engine, the engine includes a lower case 1 and an oil pan 2, two crank chambers 11 are provided in the lower case 1, the oil return collecting structure includes a plurality of oil return ports 12 vertically provided at the bottom of the crank chambers 11 and an oil return groove 13 provided at the bottom surface of the lower case 1, a horizontally disposed partition plate 3 is fixedly provided at the bottom of the lower case 1, the partition plate 3 surrounds the inner side wall of the oil return groove 13 from below to form an oil return passage 4, the top of the oil pan 2 has an oil suction port 21 communicating with the oil pump, the oil return port 12 is vertically and oppositely communicated with the oil suction port 21, the oil return passage 4 is horizontally provided and has one end communicated with the oil return port 12 far away from the oil suction port 21, the other end of the oil return passage 4 is communicated with the oil suction port 21, the lower case 1 of the oil return groove 13 is structurally sealed and abutted against the edge of the oil suction port 21, an elastic cushion block 5 is provided at the joint of the partition plate 3 and the edge of the oil suction port 21, two side edges of the elastic cushion block 5 are respectively and hermetically abutted against two side walls of the oil return groove 13, and the bottom surface of the elastic cushion block 5 is simultaneously and hermetically abutted against the partition plate 3 and the edge of the oil suction port 21. By arranging the oil return collecting structure comprising an oil return port 12 at the bottom of the crank chamber 11 and an oil return groove 13 at the bottom of the lower box 1, the bottom of the lower box body 1 is provided with a clapboard 3 which is encircled with the inner side wall of an oil return groove 13 to form an oil return channel 4, so that one end of the oil return channel 4 which is horizontally arranged is communicated with an oil return opening 12, the other end is communicated with an oil suction opening 21 in the oil pan 2, therefore, the return oil in the crankcase can directly flow into the oil return opening 12 after flowing to the bottom of the crank chamber 11 and flow into the oil suction opening 21 through the oil return channel 4, the phenomenon that the oil stirring of the crank arm caused by the accumulation of the engine oil at the bottom of the crank chamber 11 influences the oil return effect is avoided, the oil return groove 13 which is horizontally arranged is opened due to being arranged on the bottom surface of the lower box body 1, can be directly formed by casting and demoulding, and can form an oil return channel 4 which can convey engine oil far away from the oil suction port 21 by additionally arranging the partition plate 3, thereby greatly saving the processing cost of transversely forming holes in the box body and the like; the oil suction port 21 is communicated with an oil pump, low pressure can be formed in the area of the oil suction port 21 when the oil pump works, the oil pump is in sealing abutting joint with the edge of the oil suction port 21 through a lower box body 1 structure arranged at the port of an oil return groove 13, an elastic cushion block 5 is arranged at the joint of the partition plate 3 and the edge of the oil suction port 21, two side edges of the elastic cushion block 5 are respectively in sealing abutting joint with two side walls of the oil return groove 13, and the bottom surface of the elastic cushion block is simultaneously in sealing abutting joint with the edge of the partition plate 3 and the edge of the oil suction port 21, so that the matching clearance between the partition plate 3 and the edge of the oil suction port 21 is sealed by the elastic cushion block 5 from the upper part to avoid the engine oil from entering the matching clearance from two sides, the engine oil is required to pass through the top of the elastic cushion block 5 and then enter the oil suction port 21 after entering the oil return passage 4, thereby ensuring the oil return effect of the engine oil under the condition of controlling the process cost. Further, the elastic cushion block 5 is disc-shaped, the two side walls of the oil return groove 13 are both provided with a notch groove 131 matched with the outer edge shape of the elastic cushion block 5, the lower side of the notch groove 131 is open, and the two side edges of the elastic cushion block 5 are embedded in the notch groove 131 and are limited along the vertical direction. Be discoid through setting up cushion 5, and the breach groove 131 with 5 outer fringe shape adaptations of cushion is all seted up to both sides wall at oil gallery 13, the downside of breach groove 131 is uncovered, make the both sides limit of cushion 5 inlay locate in breach groove 131 and along vertical formation spacing, discoid be convenient for assembly personnel with arbitrary angle gap groove 131 of packing into, and breach groove 131 can guarantee cushion 5's installation and seal position more accurate through the shape adaptation, simultaneously the inside wall of breach groove 131 and cushion 5's surface seal cooperation, the restriction of cushion 5 shape to the sealed length in both sides limit has been reduced, make cushion 5 have more excellent sealed effect, and can improve to the resistance effect that leads to sealed effect to reduce because of 3 local deformations of baffle, thereby guarantee the oil return effect. Preferably, the notched grooves 131 are located at the port of the oil return groove 13, and one end of the notched groove 131 is opened toward the side of the oil suction port 21 in the horizontal direction. Through setting up breach groove 131 and being located oil gallery 13's port department, make breach groove 131 one end set up towards oil absorption opening 21 place one side along the horizontal direction, the port department bore of oil gallery 13 is bigger like this, does benefit to and directly takes elastic cushion 5 out along the horizontal direction from outside when needing to maintain elastic cushion 5 and change, and need not to dismantle baffle 3, avoids influencing the sealed effect of baffle 3, guarantees that the oil return is smooth and easy. The partition board 3 comprises a fixed section 31 and a cantilever section 32 which can be elastically deformed along the vertical direction, and the cantilever section 32 is just abutted against the elastic cushion block 5 along the vertical direction. Including fixed section 31 and the cantilever section 32 that can follow vertical elastic deformation through setting up baffle 3, fixed section 31 and the sealed laminating in lower box 1 bottom surface, guarantee relatively fixed, make cantilever section 32 just right lean on with cushion 5 along vertical, cushion 5's partly receives the support of cantilever section 32 like this, another part receives the support at oil absorption mouth 21 border, like this because deformation is easier behind the terminal atress of cantilever section 32, make and receive elastic extrusion can concentrate on the region that corresponds with cantilever section 32 end with the part of bottom heave after the cushion 5 installation of support, and the deformation of cantilever section 32 initial end this moment is very little, and then fall to minimumly its influence to baffle 3 sealed effect with cushion 5, guarantee oil return stability. The partition plate 3 has a through oil leak hole 33. Through set up oil leak hole 33 on baffle 3, accessible shutoff piece seals oil leak hole 33 when engine operation, and when needs were maintained, accessible oil leak hole 33 discharged the machine oil that reserves in oil return passage 4, takes out elastic cushion 5 again, makes the maintenance convenient. The partition plate 3 is fixedly connected with the bottom surface of the lower box body 1 through six bolts 8, the six bolts 8 are arranged at intervals along the circumferential direction of the partition plate 3, and the cantilever section 32 is located between the two bolts 8 which are closest to the elastic cushion block 5. The partition plate 3 is fixedly connected with the bottom surface of the lower box body 1 through a plurality of bolts 8, so that the cantilever section 32 is positioned between the two bolts 8 which are closest to the elastic cushion block 5, and the stable function of the cantilever section 32 is ensured while the process cost is controlled. The edge of the elastic cushion block 5 is subjected to chamfering transition treatment. The edges of the elastic cushion blocks 5 are subjected to chamfering transition treatment, so that convenience in mounting the elastic cushion blocks 5 into the notch grooves 131 from the lower side is guaranteed. The elastic cushion block 5 is a rubber material piece. Set up elastic cushion 5 and be rubber materials spare, do benefit to control material cost when guaranteeing sealed effect.

As shown in fig. 2-4 and 8, a coarse strainer 6 for filtering engine oil is arranged in the oil suction port 21, and the outer edge of the elastic cushion block 5 extends out of the oil return passage 4 and is suspended right above the coarse strainer 6. The coarse strainer 6 is used for filtering impurity particles in engine oil to avoid the impurity particles entering the engine oil pump to cause mechanism damage, the outer edge of the elastic cushion block 5 extends out of the oil return channel 4 and is suspended over the coarse strainer 6, therefore, the elastic cushion block 5 can generate better drainage effect, the engine oil can directly flow into the coarse strainer 6 along the elastic cushion block 5 under the action of tension after being submerged on the upper surface of the elastic cushion block 5, and smooth engine oil return is guaranteed. Furthermore, a pressing ring 7 is arranged in the oil suction opening 21, the pressing ring 7 is pressed above the coarse strainer 6 and is fixedly connected with the inner side wall of the oil suction opening 21, a positioning notch 71 is arranged on the outer edge of the pressing ring 7, and the outer edge of the elastic cushion block 5 can be matched with the positioning notch 71. The pressing ring 7 is arranged in the oil suction port 21 and pressed above the coarse filter screen 6 and fixedly connected with the inner side wall of the oil suction port 21, the positioning notch 71 is arranged at the outer edge of the pressing ring 7 and matched with the outer edge of the extending part of the elastic cushion block 5, so that the pressing ring 7 can limit the position of the elastic cushion block 5, the elastic cushion block 5 is prevented from being separated from the oil return channel 4 due to engine oil impact or vibration influence, sealing failure is avoided, and structural stability is guaranteed.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (10)

1. The utility model provides an engine crankcase oil return collects structure, the engine includes box (1) and oil pan (2) down, has a plurality of crank chamber (11) in this box (1) down, its characterized in that, the oil return is collected the structure and is included a plurality of oil return opening (12) that are located crank chamber (11) bottom and being located oil return groove (13) of box (1) bottom surface down, the bottom of box (1) has set firmly baffle (3) down, baffle (3) from the below with the inside wall of oil return groove (13) surrounds and forms oil return passageway (4), oil return passageway (4) level setting and one end with oil return opening (12) intercommunication, the top of oil pan (2) has oil absorption opening (21) with the oil pump intercommunication, the other end of this oil return passageway (4) with oil absorption opening (21) intercommunication, lower box (1) structure of oil return groove (13) port department with the border of oil absorption opening (21) seals and supports and leans on, the joint of the partition plate (3) and the edge of the oil suction opening (21) is provided with an elastic cushion block (5), two side edges of the elastic cushion block (5) are respectively and hermetically abutted against two side walls of an oil return groove (13), and the bottom surface of the elastic cushion block (5) is simultaneously and hermetically abutted against the edge of the partition plate (3) and the edge of the oil suction opening (21).

2. The engine crankcase oil return collection structure according to claim 1, wherein the elastic cushion block (5) is disc-shaped, both side walls of the oil return groove (13) are provided with a notch groove (131) adapted to the shape of the outer edge of the elastic cushion block (5), the lower side of the notch groove (131) is open, and both side edges of the elastic cushion block (5) are embedded in the notch groove (131) and vertically form a limit.

3. The engine crankcase oil return collection structure according to claim 2, wherein the notched groove (131) is located at a port of the oil return groove (13), and one end of the notched groove (131) is opened toward a side of the oil suction port (21) in a horizontal direction.

4. The engine crankcase oil return collection structure according to claim 1, 2 or 3, wherein a coarse filter screen (6) for filtering engine oil is arranged in the oil suction port (21), and an outer edge of the elastic cushion block (5) extends out of the oil return passage (4) and is suspended right above the coarse filter screen (6).

5. The engine crankcase oil return collection structure according to claim 4, wherein a pressing ring (7) is further disposed in the oil suction port (21), the pressing ring (7) is pressed above the coarse strainer (6) and is fixedly connected with the inner side wall of the oil suction port (21), a positioning notch (71) is formed in the outer edge of the pressing ring (7), and the outer edge of the elastic cushion block (5) can be matched with the positioning notch (71).

6. The engine crankcase oil return collection structure according to claim 2 or 3, wherein the partition plate (3) includes a fixed section (31) and a cantilever section (32) capable of elastic deformation along the vertical direction, and the cantilever section (32) is vertically abutted against the elastic cushion block (5).

7. The engine crankcase return oil collecting structure according to claim 1, 2 or 3, wherein the partition plate (3) has a through oil leak hole (33) formed therein.

8. The engine crankcase oil return collection structure according to claim 6, wherein the partition plate (3) is fixedly connected with the bottom surface of the lower box body (1) through a plurality of bolts (8), the bolts (8) are arranged at intervals along the circumferential direction of the partition plate (3), and the cantilever section (32) is located between the bolts (8) closest to the elastic cushion block (5).

9. The engine crankcase oil return collection structure according to claim 2 or 3, wherein the edge of the elastic cushion block (5) is subjected to chamfering transition treatment.

10. The engine crankcase oil return collection structure according to claim 1, 2 or 3, wherein the resilient pad (5) is a rubber material piece.

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