Self-oil-return cover plate of balance shaft seat

Abstract

The invention discloses a self-oil-return cover plate of a balance shaft seat, and relates to the technical field of engines. An oil return hole is formed in the containing box, one end of the oil return hole extends to the position between the first cover plate and the containing box, and the other end of the oil return hole extends into the containing box. Lubricating oil entering the space between the first cover plate and the containing box can flow back into the containing box along the oil return hole. According to the self-oil-return cover plate of the balance shaft seat, due to the fact that the oil return hole is adopted to replace a traditional connecting pipe to serve as an oil return mechanism of the balance shaft seat, the technical problems that an existing balance shaft seat cover plate is not provided with an oil return structure, each cover plate needs to be externally connected with an oil return pipe, the structure is complex, parts are redundant, and cost is increased are effectively solved; and meanwhile, due to the simplification of the oil return mechanism, the connection of the two ends of the oil pipe is reduced, and the oil leakage risk of the connection points of the two ends of the oil return pipe of each shaft seat is also reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and particularly to a self-return oil cover plate for a balance shaft seat. Background Art

[0002] A balance shaft device for an automotive engine is used to reduce engine vibration, reduce engine noise, and extend the life of the engine. The main structure of the balance shaft device is a balance shaft provided with a follower rotating counterweight block. The counterweight block is incompletely arranged in the circumferential direction of the balance shaft, and an unbalanced centrifugal force can be formed. Gears that are paired and meshed are respectively arranged on the balance shaft and the crankshaft. Among them, the balance shaft seat of the engine needs to form a lubricating oil film for the balance shaft on the bearing of the shaft seat through an internal oil passage. The balance shaft seat has a through hole leading to the outside at the rear end of the engine, and a cover plate needs to be installed to block it, and the cover plate needs to have the functions of sealing and returning oil, otherwise oil leakage will occur.

[0003] Currently, a Chinese patent with the patent application number "CN202021111981.4" discloses a high-rigidity short-shaft open-type balance shaft mechanism, which is applied to a four-cylinder engine and is arranged below the third cylinder of the engine cylinder. It includes a balance shaft seat. Inside the balance shaft seat, a balance shaft I and a balance shaft II are horizontally arranged side by side. The lengths of the balance shaft I and the balance shaft II only span the third cylinder of the engine cylinder respectively. On the balance shaft I and the balance shaft II inside the balance shaft seat, a balance block I and a balance block II are respectively arranged. The balance shaft I and the balance shaft II extend out of the left side of the balance shaft seat, and gears I and II are respectively arranged at their extending ends. The number of teeth and the module of the gear I and the gear II are the same and they mesh with each other. A cover plate is arranged outside the gear I and the gear II, and an oil return hole is arranged at the bottom of the balance shaft seat. Although it is convenient for the oil to flow back by arranging an oil return hole at the bottom of the balance shaft chamber, it is for the lubricating oil in the balance shaft chamber and returns the lubricating oil at the cover plate position.

[0004] However, during the implementation of the above technical solution, it is found that at least the following technical problems exist:

[0005] The existing balance shaft seat cover plate does not have an oil return structure, and an oil return pipe needs to be externally connected to each cover plate, resulting in a complex structure, redundant components, and increased costs. As shown in Figure 11 and Figure 12 (cover plate two 4), the cover plate two 4 includes a mounting seat 41, and there is a circular convex seat 42 outside the mounting seat 41, so as to temporarily store the lubricating oil at the end of the balance shaft. Then, the lubricating oil enters the connecting pipe 44 along the oil outlet pipe 43 outside the convex seat 42, and then enters the oil return pipe 45 communicated with the placement box 11 along the connecting pipe 44, thereby completing the oil return. However, since the connecting pipe 44 is in a "U" shape, the lubricating oil cannot be completely returned (the oil return is not clean). For this reason, we propose a self-return oil cover plate for a balance shaft seat. Summary of the Invention

[0006] (1) Technical Problem to be Solved

[0007] In view of the deficiencies of the prior art, the present invention provides a self - oil - returning cover plate for a balance shaft seat, which solves the technical problems that the existing cover plate of the balance shaft seat does not have an oil - returning structure, and it is necessary to externally connect an oil - return pipe to each cover plate, resulting in a complex structure, redundant components, and increased costs.

[0008] (2) Technical Solution

[0009] To achieve the above object, the present invention is realized through the following technical solutions:

[0010] A self - oil - returning cover plate for a balance shaft seat, the cover plate comprising:

[0011] A placement box for storing the balance shaft;

[0012] Cover plate one, which is connected to the shaft seat on the surface of the placement box;

[0013] Wherein, an oil - return hole is opened on the placement box, and one end of the oil - return hole extends to the gap between cover plate one and the placement box, and the other end extends to the inside of the placement box;

[0014] The lubricating oil entering the gap between cover plate one and the placement box can flow back into the placement box along the oil - return hole.

[0015] Preferably, a piston disk is embedded in the interior of the oil - return hole, and the piston disk corresponds to the driving component on cover plate one;

[0016] Wherein, the piston disk reciprocates in the oil - return hole under the action of the driving component.

[0017] Preferably, the driving component includes an electromagnet, an iron core is installed inside the electromagnet, and a coil is wound around the outside of the iron core. When the coil is energized, the electromagnet generates magnetism to attract or repel the piston disk inside the oil - return hole.

[0018] Preferably, an oil - return pipe is installed in the oil - return hole, and the piston disk is located inside the oil - return pipe and fits with the inner wall of the piston disk;

[0019] Wherein, a through - hole is opened at each end of the oil - return pipe, and the through - hole facing the side of cover plate one is opened upward, and the through - hole facing the inside of the placement box is opened downward;

[0020] A retaining piece for limiting the piston disk is provided on the inner wall of the through - hole. When the piston disk moves to the end of the oil - return pipe, the piston disk fits with the retaining piece and does not completely block the through - hole at the end of the oil - return pipe.

[0021] Preferably, the piston disk includes a magnet sheet in a cylindrical shape, and a collar is sleeved outside the magnet sheet and fits tightly therewith;

[0022] Wherein, each end of the collar is provided with an annular scraping piece, and the magnet sheet is attached to the inner wall of the oil return pipe through the scraping piece.

[0023] Preferably, the driving assembly includes a sliding pin installed on the outer wall of the first cover plate, corresponding to the inner magnet inside the first cover plate, and the two attract each other magnetically;

[0024] Wherein, the inner magnet is connected to a piston disk inserted inside the oil return pipe. When the inner magnet moves, the inner magnet can drive the piston disk to reciprocate inside the oil return pipe.

[0025] Preferably, guiding grooves extending vertically are formed on both the inner and outer sides of the first cover plate, the sliding pin corresponds to the guiding groove on the outer side of the first cover plate, and the inner magnet corresponds to the guiding groove on the inner side of the first cover plate.

[0026] Preferably, a metal strip is connected between the inner magnet and the piston disk, and the metal strip is arc-shaped. When the inner magnet moves, the piston disk can be driven through the metal strip.

[0027] Preferably, a docking seat is embedded and installed inside the first cover plate, and the docking seat corresponds to the oil return pipe. When the first cover plate is installed on the placement box, the end of the oil return pipe fits with the docking seat;

[0028] Wherein, a steering groove is formed inside the docking seat, and the metal strip is located in the steering groove. Both ends of the steering groove are arc-shaped, and the metal strip entering and leaving the steering groove is arc-shaped.

[0029] (III) Beneficial effects

[0030] 1. Since an oil return hole is used instead of the traditional "connecting pipe" as the oil return mechanism of the balance shaft seat, effectively solving the technical problems that the existing balance shaft seat cover plate does not have an oil return structure, external oil return pipes need to be connected to each cover plate, the structure is complex, the components are redundant, and the cost is increased. Further, during the disassembly and assembly of engine maintenance and repair, the problem of oil leakage from the oil pipe is avoided. At the same time, due to the simplification of the oil return mechanism, the connection at both ends of the oil pipe is reduced, and the oil leakage risk at both connection points of the oil return pipe for each shaft seat is also reduced.

[0031] 2. Since a magnetic piston disk is adopted as the cleaning mechanism for the inner wall of the return oil pipe, only by controlling the magnetic pole direction of an external electromagnet on the cover plate can the reciprocating motion of the piston disk be controlled, so as to discharge the impurities retained or accumulated in the return oil pipe, effectively keep the inside of the return oil pipe clean, avoid affecting the normal use of the return oil pipe, and at the same time, utilize the magnetism of the piston disk to adsorb metal impurities such as iron filings in the lubricating oil, which is convenient for later cleaning. In addition, by using this method, there is no need to consider the sealing problem and it will not affect the original structure. Therefore, while ensuring the normal use of the return oil pipe, the impact on the return oil pipe can be minimized to the greatest extent.

[0032] 3. Since a metal strip is adopted as the connection structure between the piston disk and the inner magnet, when the inner magnet moves, the piston disk can be driven to move synchronously. Then, by using the docking seat provided with a steering groove as the guiding structure of the metal strip, the toughness of the metal strip can be ensured while changing the movement direction of the metal strip (such as a traditional tape measure). The inner magnet and the sliding pin attract each other through the magnetic field, and the distance between them will not change. Therefore, the magnetic force between them is stable, ensuring that the piston disk can move stably and accurately. Brief Description of the Drawings

[0033] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly and implement it in accordance with the content of the specification, the following takes the preferred embodiments of the present invention and combines with the drawings to describe in detail as follows.

[0034] Figure 1 It is the overall structure diagram of Embodiment 1 of the present invention;

[0035] Figure 2 It is the exploded structure diagram of the cover plate one and the placement box in Embodiment 1 of the present invention;

[0036] Figure 3 It is the partial cross-sectional view of the placement box in Embodiment 1 of the present invention;

[0037] Figure 4 It is the structure diagram of the electromagnet in Embodiment 1 of the present invention;

[0038] Figure 5 It is the structure schematic diagram of the return oil pipe in Embodiment 1 of the present invention;

[0039] Figure 6 It is the structure diagram of the piston disk in Embodiment 1 of the present invention;

[0040] Figure 7 It is the structure diagram of the placement box in Embodiment 2 of the present invention;

[0041] Figure 8 It is the inner side structure diagram of the cover plate one in Embodiment 2 of the present invention;

[0042] Figure 9 It is the explosion structure diagram of the inner side of the first cover plate in Embodiment 2 of the present invention;

[0043] Figure 10 It is the schematic diagram of the metal strip and the docking seat in Embodiment 2 of the present invention;

[0044] Figure 11 It is the structure diagram of the existing placement box;

[0045] Figure 12 It is the structure schematic diagram of the existing second cover plate.

[0046] Legend Explanation:

[0047] 11. Placement box; 12. Axle seat; 13. Axle collar;

[0048] 2. First cover plate;

[0049] 31. Oil return pipe; 311. Flap; 32. Piston disc; 321. Magnet sheet; 322. Collar; 323. Scraping blade; 33. Electromagnet; 331. Sealing box; 332. Iron core; 333. Coil;

[0050] 4. Second cover plate; 41. Mounting seat; 42. Protruding seat; 43. Oil outlet pipe; 44. Connecting pipe; 45. Oil return pipe;

[0051] 51. Sliding pin; 52. Inner magnet; 53. Docking seat; 54. Metal strip. Specific Embodiment

[0052] By providing a self - oil - returning cover plate for a balance axle seat in the embodiment of the present application, the technical problem in the prior art that the cover plate of the balance axle seat does not have an oil - returning structure, and it is necessary to externally connect an oil return pipe to each cover plate, resulting in a complex structure, redundant parts, and increased costs is solved. When the balance axle seat is in use, since an oil return hole is used instead of the traditional "connecting pipe" as the oil - returning mechanism of the balance axle seat, during the disassembly and assembly of engine maintenance and repair, the problem of oil leakage from the oil pipe is avoided. At the same time, due to the simplification of the oil - returning mechanism, the connection at both ends of the oil pipe is reduced, and the oil leakage risk at both ends of the oil return pipe for each axle seat is also reduced; since a magnetic piston disc is used as the cleaning mechanism for the inner wall of the oil return pipe, only by controlling the magnetic pole direction of the electromagnet outside the first cover plate can the piston disc be controlled to reciprocate, thereby discharging the impurities remaining or accumulating in the oil return pipe, effectively keeping the inside of the oil return pipe clean and avoiding affecting the normal use of the oil return pipe. At the same time, using the magnetism of the piston disc to adsorb metal impurities such as iron filings in the lubricating oil is convenient for later cleaning. In addition, using this method does not need to consider the sealing problem and will not affect the original structure. Therefore, while ensuring the normal use of the oil return pipe, the impact on the oil return pipe is minimized.

[0053] Embodiment 1

[0054] The technical solution in the embodiment of this application is to solve the technical problem in the prior art that the balance shaft seat cover plate does not have an oil return structure, and it is necessary to externally connect an oil return pipe 31 to each cover plate, resulting in a complex structure, redundant components, and increased costs. The general idea is as follows:

[0055] In view of the problems existing in the prior art, the present invention provides a self-oil-return cover plate for a balance shaft seat. The self-oil-return cover plate is connected to a placement box 11 for storing balance shafts (multiple shaft seats 12 are provided at both ends thereof for placing balance shafts, and an axle collar 13 is provided inside the shaft seat 12 to fix the balance shaft), as Figure 1 and Figure 2 shown. It mainly consists of a cover plate one 2 and an oil return hole opened on the placement box 11. Under the action of the centrifugal force and thrust when the balance shaft rotates, the lubricating oil contacts the balance shaft, so that an oil film is covered on it. The remaining lubricating oil enters the cover plate and moves towards the bottom of the cover plate under the action of its own gravity, and then enters the oil return hole, as Figure 3 shown by the opening A in. Then it flows along the oil return hole to the opening B and flows out, and returns to the placement box 11 again, thus forming a cycle to realize the recycling of the lubricating oil. This design simplifies the structure, reduces the maintenance cost, improves the system reliability, and ensures the long-term stable operation of the engine.

[0056] In addition, one end of the oil return hole extends to the gap between the cover plate one 2 and the placement box 11, and the other end extends to the inside of the placement box 11 to ensure the smooth return of the lubricating oil. At the same time, in order to ensure that the lubricating oil can stably return to the placement box 11, the oil return hole can be designed with an inclined angle to accelerate the flow of the oil liquid by gravity, and a diversion groove is added to the inner wall of the hole to prevent the oil liquid from staying, ensuring efficient return. In addition, a sealing strip is used at the edge of the cover plate one 2 to prevent the oil liquid from overflowing, further improving the system sealing performance and reliability.

[0057] However, it is found in the actual detection process that due to the limited inner diameter of the oil return hole and a large amount of impurities contained in the lubricating oil during use, these impurities are easily accumulated on the inner wall of the oil return hole, affecting the return efficiency. For example, impurities such as metal chips, dust, oil scale, and aging (high-temperature oxidation) will gradually accumulate on the inner wall, resulting in the blockage of the oil return hole and reducing the lubrication effect. To solve this problem, a structure capable of cleaning the oil return hole is required. The specific solution is as follows:

[0058] A movable piston disk 32 is added inside the cover plate one 2 to scrape the impurities on the inner wall of the oil return hole to ensure that the oil return hole is unobstructed. The scraping blade 323 is made of wear-resistant and corrosion-resistant materials, which can not only effectively remove impurities but also not damage the inner wall, thereby maintaining efficient return and extending the service life of the equipment.

[0059] In order to drive the piston disk 32 to reciprocate, a driving device is adopted. However, due to the very small inner diameter of the oil return hole, it is unable to carry a particularly large or complex structure. Therefore, traditional common driving structures such as motors and telescopic rods cannot be used. Moreover, installing these structures will also affect the use of the balance shaft seat. Suppose a telescopic rod is installed to drive the piston disk 32 to reciprocate. Since the telescopic rod itself has a certain size, if it is installed on the device, not only the cover plate 2 needs to be modified, but also the sealing performance of the original equipment needs to be ensured after the addition, resulting in the inability of the added driving device to meet the requirements.

[0060] Through continuous exploration and experimentation, we finally designed a micro electromagnetic driving device, which is small in size, easy to install, and does not affect the original structure. This device precisely controls the reciprocating motion of the piston disk 32 through electromagnetic force, effectively removes impurities on the inner wall of the oil return hole, ensures the smooth circulation of lubricating oil, and further improves the system stability and service life.

[0061] It mainly drives the magnet by generating a magnetic field through the electromagnetic coil 333 installed inside the cover plate 2 and installs a directional magnet sheet 321 inside the piston disk 32, thereby driving the piston disk 32 to move. As for the frequency and amplitude of the reciprocating motion, they can be precisely controlled by adjusting the current intensity and direction of the electromagnetic coil 333 to ensure the best impurity removal effect without affecting the overall operation efficiency of the equipment. The structure is as follows:

[0062] An electromagnet 33 is installed on the cover plate, and the electromagnet 33 is housed in a sealed box 331 to seal the electromagnet 33. The electromagnet 33 consists of an iron core 332 at the center and a coil 333 wound around the outside of the iron core 332. In this way, when the coil 333 is energized, the electromagnet 33 can be controlled to generate magnetism to attract or repel the piston disk 32 inside the oil return hole (by adjusting the flow direction of the coil 333 to change the magnetic field).

[0063] For example, as Figure 6 shown, the front end of the magnet sheet 321 at the center of the piston disk 32 is the S pole, and the end facing the electromagnet 33 is the N pole. When the piston disk 32 needs to move inside the oil return pipe 31, a "positive" current is passed into the electromagnet 33. At this time, the end of the electromagnet 33 facing the piston disk 32 is the S pole magnetic field. At this time, the "S pole" of the electromagnet 33 and the "N pole" of the piston disk 32 are opposite magnetic poles. According to the principle of "like poles repel, opposite poles attract" of magnetism, the piston disk 32 moves in the direction of the electromagnet 33 until it reaches the end of the oil return pipe 31; conversely, when a "reverse" current is passed, the electromagnet 33 becomes the N pole, repelling the piston disk 32 to move backward, realizing reciprocating motion and efficiently removing impurities.

[0064] In order to enable normal oil return, an oil return pipe 31 is installed in the oil return hole. The oil return pipe 31 is composed of two symmetric "half pipes", and through holes are provided at both ends of the oil return pipe 31. The through hole facing the side of the cover plate 2 opens upward, and the through hole facing the inside of the placement box 11 opens downward. As Figure 5 shown, in this way, the lubricating oil can flow into the oil return pipe 31 through the through hole A, and then flow out from the through hole B at the other end of the oil return pipe 31, thus forming a reflux. To prevent the piston disk 32 from sliding out of the oil return pipe 31, a retaining piece 311 that can limit the piston disk 32 is provided at the end of the oil return pipe 31. As Figure 5 shown, when the piston disk 32 moves to the end of the oil return pipe 31, the piston disk 32 fits against the retaining piece 311 and does not completely block the through hole at the end of the oil return pipe 31. In this way, the piston disk 32 will not fall out of the oil return pipe 31.

[0065] On the contrary, in order to improve the cleaning strength of the inner wall of the oil return pipe 31 by the piston disk 32, a scraping piece 323 is added to the edge of the piston disk 32. The scraping piece 323 is made of wear-resistant material and has a certain elasticity to ensure that it closely adheres to the inner wall during reciprocating motion, effectively scraping off the attached impurities without damaging the pipe wall, thus improving the cleaning effect. The scraping piece 323 is designed as a replaceable structure, which is convenient for maintenance and replacement, and prolongs the service life of the equipment. By optimizing the shape and material of the scraping piece 323, the cleaning efficiency is further improved, ensuring the long-term stable operation of the oil return system and reducing the failure rate.

[0066] In the specific implementation process, when it is necessary to clean the impurities inside the oil return pipe 31, the operator can control the current passing through the electromagnet 33 in a specific direction. As Figure 6 shown, the front end of the magnet piece 321 at the center of the piston disk 32 is the S pole, and the end facing the electromagnet 33 is the N pole. When it is necessary for the piston disk 32 to move inside the oil return pipe 31, a "positive" current is passed into the electromagnet 33. At this time, the end of the electromagnet 33 facing the piston disk 32 is the S pole magnetic field. At this time, the "S pole" of the electromagnet 33 and the "N pole" of the piston disk 32 are opposite magnetic poles. According to the principle of "like poles repel, opposite poles attract" of magnetism, at this time, the piston disk 32 moves in the direction of the electromagnet 33 until it moves to the end of the oil return pipe 31; conversely, when a "reverse" current is passed, the electromagnet 33 becomes the N pole, repelling the piston disk 32 to move backward, realizing reciprocating motion and efficiently removing impurities. Therefore, by adjusting the moving speed and frequency of the piston disk 32, it can perform efficient reciprocating motion inside the oil return pipe 31, completely removing impurities, ensuring the cleanliness of the oil fluid, and improving the operating efficiency of the system.

[0067] Embodiment 2

[0068] Based on Embodiment 1, the embodiment of the present application provides a new structure of the driving component, and the general idea is as follows:

[0069] During use, it was found that there was a problem of unstable magnetic force in controlling the movement of the piston disc 32 by the electromagnet 33 in Embodiment 1. For example, when the distance between the piston disc 32 and the electromagnet 33 was relatively far, the magnetic force weakened, resulting in unsmooth movement of the piston disc 32. To solve this problem, we propose a new solution as follows:

[0070] A sliding pin 51 is arranged outside the first cover plate 2 and corresponds to the inner magnet 52 inside the first cover plate 2. In this way, the distance between the two is short and the magnetic attraction is stable. Therefore, when the sliding pin 5 moves, the inner magnet 52 inside the first cover plate 2 always moves synchronously with it. Through this design, the magnetic force action range is more concentrated, effectively avoiding the magnetic force attenuation caused by distance change, ensuring the smooth and reliable movement of the piston disc 32, and improving the stability and working efficiency of the overall device. At the same time, the synchronous movement of the first cover plate 2 and the inner magnet 52 further optimizes the structure of the drive assembly, simplifies the operation process, and reduces the maintenance difficulty. To ensure the stable movement of the inner magnet 52, a guiding groove extending up and down is opened on each of the inner and outer sides of the first cover plate 2. The sliding pin 51 corresponds to the guiding groove on the outer side of the first cover plate 2, and the inner magnet 52 corresponds to the guiding groove on the inner side of the first cover plate 2. Through the precise positioning of the guiding groove, it is ensured that the sliding pin 51 and the inner magnet 52 always remain parallel during the movement process, avoiding offset and jamming phenomena, and further improving the operation accuracy and reliability of the device.

[0071] In order to drive the piston disc 32 to move synchronously as well, we add a flexible connection belt between the sliding pin 5 and the piston disc 32 to ensure synchronous movement of the two, and at the same time add a buffer device to absorb the impact force during movement, reduce wear, and extend the service life. However, it is also necessary to maintain a certain stability to avoid the connection belt being unable to push the piston disc 32. Therefore, referring to the structure of the traditional "tape measure", when it is bent, it has flexibility, and when it is straight, it remains stable. Drawing on this principle, the connection belt is designed to be flexible when pulled and stable when pushed to ensure that the piston disc 32 moves precisely following the sliding pin, further optimizing the overall performance of the drive assembly. Therefore, a metal strip 54 is used as the connection belt. In order to maintain the stability of the metal strip 54, the metal strip 54 is in an arc shape. When the inner magnet 52 moves, the piston disc 32 can be driven to move through the metal strip 54. Moreover, a docking seat 53 is embedded and installed inside the first cover plate 2, and the docking seat 53 corresponds to the return oil pipe 31. When the first cover plate 2 is installed on the placement box 11, the end of the return oil pipe 31 fits with the docking seat 53, as Figure 8 and Figure 9 shown. And a steering groove is opened inside the docking seat 53, and the metal strip 54 is located in the steering groove. Both ends of the steering groove are in an arc shape, and the metal strip 54 entering and exiting the steering groove is in an arc shape. In this way, the metal strip 54 entering and exiting the steering groove will always remain in an arc shape, that is, the metal strip 54 outside the docking seat 53 maintains sufficient hardness, as follows:

[0072] When the piston disc 32 needs to move, the sliding pin 41 (with a magnet inside) is adjusted up and down. Since it is connected to the inner magnet 52 inside the first cover plate 2 through a magnetic field, during the up and down movement of the sliding pin 41, the inner magnet 52 can be driven to move synchronously. Also, since the inner magnet 52 is connected to the piston disc 32 through the metal strip 54, when the inner magnet 52 moves upward, the metal strip 54 is stretched accordingly, pulling the piston disc 32 to move in the direction of the first cover plate 2. On the contrary, when the inner magnet 52 moves downward, the metal strip 54 passes through the docking seat 53 and extends to the other end of the docking seat 53. The metal strip 54 bends in the turning groove and becomes arc-shaped when extending out of the other end of the docking seat 53, thus having a certain stiffness. Thereby, the downward pulling force of the inner magnet 52 can be transmitted to the piston disc 32 to ensure its stable following movement, avoiding power loss caused by excessive bending of the metal strip 54 and further improving the efficiency and stability of the drive system. It can be used when the balance shaft seat needs to be repaired. In this way, the impurities inside the oil return hole can be cleaned up.

[0073] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly illustrating the present invention and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A self-returning oil cover plate of a balancing shaft seat, connected to a storage box (11) for storing the balancing shaft, characterized in that: The cover includes: A cover plate (2) connected to an axle seat (12) on the surface of the placement box (11); The placement box (11) is provided with an oil return hole, and one end of the oil return hole extends to the gap between the cover plate 1 (2) and the placement box (11), and the other end extends to the interior of the placement box (11); The lubricating oil that enters between the cover plate 1 (2) and the placement box (11) can flow back into the placement box (11) along the oil return hole.

2. The self-returning oil cover plate of a balancing shaft seat according to claim 1, characterized in that: A piston disc (32) is embedded in the oil return hole, and the piston disc (32) corresponds to the driving component on the cover plate 1 (2); Wherein, the piston disc (32) performs reciprocating motion in the oil return hole under the action of the driving component.

3. The self-returning oil cover plate of a balancing shaft seat according to claim 2, characterized in that: The driving component comprises an electromagnet (33), an iron core (332) is installed inside the electromagnet (33), and a coil (333) is wound around the outside of the iron core (332). When the coil (333) is energized, the electromagnet (33) generates magnetism to attract or repel the piston disc (32) inside the oil return hole.

4. The self-returning oil cover plate of a balancing shaft seat according to claim 2, characterized in that: An oil return pipe (31) is installed in the oil return hole, and the piston disc (32) is located inside the oil return pipe (31) and fits with the inner wall of the piston disc (32); Wherein, the oil return pipe (31) has a through hole at each end, and the through hole facing the side of the cover plate (2) is opened upward, and the through hole facing the inside of the placement box (11) is opened downward; The inner wall of the through hole is provided with a baffle (311) for limiting the position of the piston disc (32); when the piston disc (32) moves to the end of the oil return pipe (31), the piston disc (32) fits with the baffle (311) and does not completely block the through hole at the end of the oil return pipe (31).

5. The self-returning oil cover plate of a balancing shaft seat as claimed in claim 4, characterized in that: The piston disc (32) comprises a cylindrical magnet sheet (321), and the magnet sheet (321) is sleeved with a collar (322) which is tightly fitted therewith. Wherein, an annular scraper (323) is respectively provided at both ends of the collar (322), and the magnet sheet (321) is fitted to the inner wall of the oil return pipe (31) via the scraper (323).

6. The self-returning oil cover plate of a balancing shaft seat as claimed in claim 2, characterized in that: The driving assembly comprises a sliding pin (51) mounted on the outer wall of the cover plate 1 (2) and corresponding to an inner magnet (52) on the inner side of the cover plate 1 (2), and the two are attracted to each other by magnetic force; The inner magnet (52) is connected to a piston disc (32) inserted into the oil return pipe (31), and when the inner magnet (52) moves, the inner magnet (52) can drive the piston disc (32) to reciprocate inside the oil return pipe (31).

7. The self-returning oil cover plate of a balancing shaft seat according to claim 6, characterized in that: Both inner and outer sides of the cover plate 1 (2) are provided with guide grooves extending up and down, and the sliding pin (51) corresponds to the guide groove on the outer side of the cover plate 1 (2), and the inner magnet (52) corresponds to the guide groove on the inner side of the cover plate 1 (2).

8. The self-returning oil cover plate of a balancing shaft seat according to claim 7, characterized in that: A metal strip (54) is connected between the inner magnet (52) and the piston disc (32), and the metal strip (54) is arc-shaped. When the inner magnet (52) moves, the piston disc (32) can be driven to move by the metal strip (54).

9. The self-returning oil cover plate of a balancing shaft seat according to claim 8, characterized in that: A docking seat (53) is embedded inside the cover plate 1 (2), and the docking seat (53) corresponds to the oil return pipe (31). When the cover plate 1 (2) is installed on the placement box (11), the end of the oil return pipe (31) fits with the docking seat (53); A steering groove is provided inside the docking seat (53), and the metal strip (54) is located in the steering groove. Both ends of the steering groove are arc-shaped, and the metal strips (54) entering and exiting the steering groove are arc-shaped.

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