An engine crankcase cover plate assembly

Abstract

The present application belongs to the technical field of crankcase, and particularly relates to an engine crankcase cover plate assembly, which comprises a cover plate assembly used for sealing a side end opening of a crankcase and lubricating internal components of the crankcase by using oil at the bottom of the crankcase. The cover plate assembly in the present application is integrated with an oil pump assembly and an oil passage conversion assembly, so that the integration degree is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of crankcase technology, and particularly relates to an engine crankcase cover assembly. Background Technology

[0002] The crankcase is divided into an upper crankcase and a lower crankcase. The upper crankcase is cast as a single piece with the cylinder block, while the lower crankcase stores lubricating oil and seals the upper crankcase; hence, it is also called the oil pan. Usually, the cylinder block and crankcase are cast as a single piece, called a cylinder block crankcase. This structural form offers good rigidity and strength, is simple to manufacture, and facilitates engine disassembly and assembly. The crankcase cover is mainly used for sealing the sides of the crankcase to prevent oil leakage and ensure normal engine operation.

[0003] The engine oil at the bottom of the crankcase needs to be extracted using a pump. The oil coming out of the pump is divided into two paths: one path passes through a filter screen and enters the various lubrication points, while the other path passes through a pressure relief valve and re-enters the crankcase.

[0004] With advancements in manufacturing technology and increasing integration of parts, oil pumps, oil filters, and pressure relief valves are typically integrated into the crankcase cover. However, there are areas for improvement: 1. The integration level of the oil pump, oil filter, pressure relief valve and crankcase cover is not high, and its integration level can be further improved.

[0005] 2. Oil pumps generally use gear pumps. The amount of oil pumped by a gear pump depends on the crankshaft speed. The faster the speed, the greater the amount of oil pumped. Although the pressure in the oil circuit can be limited by the pressure relief valve, when the oil pump is working at high speed, there will be a corresponding flow of oil pumped out regardless of whether the pressure is relieved or not. The gears in the pump are under great force, and they will loosen due to vibration after long-term operation.

[0006] 3. The filter paper in the oil filter will become clogged after a long period of use. In order to ensure that the oil circuit remains in a state of continuous flow after the filter paper becomes clogged, a backup channel without filtration function will be set next to the oil circuit. Because the backup channel has no filtration function, the engine oil entering the crankcase through the backup channel contains impurities, which is detrimental to the operation of the engine.

[0007] This invention designs an engine crankcase cover assembly to solve the above problems. Summary of the Invention

[0008] Based on this, it is necessary to address the existing problems of crankcases by providing an engine crankcase cover assembly. The cover assembly of this invention integrates an oil pump assembly and an oil circuit conversion assembly, effectively improving the integration level. In this invention, the oil pump assembly, via a first pumping gear mounted on a first rotating shaft, can rotate relative to the first rotating shaft at a certain angle when the oil pressure inside the pump housing is too high. This causes the first pumping gear to move axially a certain distance under its threaded engagement with the first rotating shaft. Ultimately, this creates a gap between the first and second pumping gears and the inner wall of the pump housing and the sealing plate, directly connecting the oil inlet and outlet inside the pump housing. This effectively relieves pressure inside the pump housing and reduces the pumping volume of the oil pump assembly, thereby reducing the vibration of the first and second pumping gears caused by stress and preventing loosening of the first and second pumping gears due to vibration caused by high stress during long-term use. The oil circuit switching assembly of this invention utilizes the power of the second rotating shaft in the oil pump assembly to drive the centrifugal blades on the second filter cartridge to rotate rapidly. This increases the centrifugal force of the oil pumped into the annular space between the first cylinder and the second filter cartridge via the first oil outlet pipe, ensuring that the oil pumped into the annular space between the first cylinder and the second filter cartridge can be effectively filtered through the first filter cartridge and reach the crankcase or other parts requiring lubrication via the fourth oil outlet pipe, oil chamber, and third oil outlet pipe. When the first filter cartridge becomes clogged after prolonged use, the oil circuit switching assembly of this invention closes the first oil passage on the first cylinder by rotating the third cylinder. This allows the oil pumped into the annular space between the first cylinder and the second filter cartridge via the first oil outlet pipe to reach a certain pressure, overcoming the centrifugal force generated by the centrifugal blades on the second filter cartridge. The oil then reverses direction, passing through the second filter cartridge and entering the second annular sleeve. The valve assembly opens via the second oil outlet pipe, allowing the oil to reach the crankcase or other parts requiring lubrication. This prevents the oil from adversely affecting the crankcase operation due to unfiltered impurities after the first filter cartridge becomes clogged. In this invention, the densely packed, messy soft bristles on the inner wall of the first filter cartridge in the oil circuit conversion assembly can lock in the impurities blocked by the first filter cartridge, preventing the impurities at the filtration point from re-entering the engine oil. This facilitates the removal of impurities from the engine oil when the first filter cartridge is replaced later, effectively reducing the impurity content of the engine oil and improving the filtration efficiency of the newly replaced first filter cartridge.

[0009] The above objectives are achieved through the following technical solutions: An engine crankcase cover assembly includes: A cover plate assembly installed at the side opening of the crankcase is used to seal the side opening of the crankcase and to lubricate the internal components of the crankcase using the engine oil at the bottom of the crankcase. The cover plate assembly includes a side end cover that seals the side opening of the crankcase. The side end cover has a first shaft hole that mates with the crankshaft. An oil pump assembly is installed on the lower side of the side end cover to draw engine oil from the bottom of the crankcase using the power of the crankshaft to lubricate the internal components of the crankcase. An oil circuit conversion assembly is installed on the outside of the oil pump assembly to filter the oil output by the power of the oil pump assembly.

[0010] In one embodiment, the side end cap is bolted to the side end of the crankcase, and a first sealing gasket is provided between the side end cap and the crankcase.

[0011] In one embodiment, the oil pump assembly includes a pump housing with an open lower end. An oil inlet and an oil outlet are respectively provided on opposite sides of the middle portion of the pump housing. The oil inlet is connected to the bottom of the crankcase via a suction pipe, and the oil outlet is connected to an oil circuit conversion assembly via a first oil outlet pipe. A second shaft hole and a third shaft hole are provided on the top of the pump housing, symmetrically distributed on both sides of the axis of the oil inlet or outlet. A first rotating shaft and a second rotating shaft, respectively rotatably connected to the crankshaft end, are respectively installed in the second and third shaft holes. A first pump gear is provided on the first rotating shaft, which has a clearance fit with the inner wall of the pump housing. A second annular groove is provided on the inner wall of the fourth shaft hole of the first pump gear. The upper end of the second annular groove of the fourth shaft hole has an open... The fourth shaft hole has an internal thread that mates with the external thread on the first shaft. A limiting groove that mates with the upper limit block of the first shaft is opened on the inner wall of the second annular groove at the lower end of the fourth shaft hole. A first annular sleeve is slidably mounted on the first shaft and rotatably mounted within the second annular groove. A spiral spring connects the first annular sleeve and the inner wall of the second annular groove. A second pumping gear that meshes with the first pumping gear and has a clearance fit with the inner wall of the pump housing is mounted on the second shaft. A sealing plate that slides vertically inside the pump housing provides sealing. A guide ring is provided on the inner side of the sealing plate and rotatably mounted within the first annular groove on the lower end face of the first pumping gear. A sealing cap that blocks the lower opening of the pump housing is installed with bolts. The sealing cap has an air pressure balance hole.

[0012] In one embodiment, an oil pressure sensor is installed on the wall of the first oil outlet pipe via a branch pipe.

[0013] In one embodiment, the upper end of the second rotating shaft is bolted with a second limiting sleeve that mates with the top of the pump housing. The top of the pump housing is bolted with a first limiting sleeve that rotatably mates with the annular protrusion on the first rotating shaft. The first rotating shaft is provided with two guide keys that are 180 degrees apart circumferentially. The guide keys slide in the keyway on the inner wall of the first annular sleeve. The sealing plate is provided with a guide sleeve that slidably mates with the inner wall of the pump housing. A second sealing gasket is fitted between the first annular plate and the pump housing.

[0014] In one embodiment, a first gear is provided at the upper end of the first shaft, and the first gear meshes with a second gear at the crankshaft end.

[0015] In one embodiment, the oil circuit switching assembly includes a first annular plate bolted to the top of the pump housing. The first annular plate has a coaxial second annular sleeve and a first cylinder. An annular gap exists between the first cylinder and the second annular sleeve. A third annular plate is located on the outer side of the first cylinder, and a second cylinder is mounted on the third annular plate. An annular space exists between the second cylinder and the first cylinder. The first cylinder has evenly distributed first oil passages on its wall, with these passages located above the third annular plate. A third annular sleeve is mounted on the upper end of the second annular sleeve via the second annular plate. A second filter cylinder with a sealed upper end is inserted into the third annular sleeve. A rotary sealing sleeve mates between the second filter cylinder and the third annular sleeve. A hexagonal shaft that mates with a hexagonal groove at the upper end of a second rotating shaft is mounted on the lower end of the second filter cylinder via a connecting rod. A first slot is provided on the third annular plate, into which a first filter cylinder is inserted, dividing the annular space between the second cylinder and the first cylinder into two annular spaces. An upper end is located on the outer side of the first cylinder. The third cylinder is sealed. The cylinder wall of the third cylinder is evenly and densely covered with second oil passages that correspond one-to-one with the first oil passages. A positioning shaft is provided at the top of the second filter cylinder, located within a rotating seat at the top of the third cylinder. A sealing cap is threaded to the top of the second cylinder. The top of the sealing cap has a second slot that mates with the second cylinder, a third slot that mates with the first filter cylinder, and a fourth slot that mates with a fourth ring at the top of the third cylinder. A first sealing ring fits between the inner wall of the second slot and the second cylinder. A second sealing ring fits between the inner wall of the third slot and the inner and outer walls of the first filter cylinder. A third sealing ring fits between the fourth slot and the inner and outer walls of the fourth ring. A second oil outlet pipe communicating with the inner surface of the second ring is provided on its wall. The upper end of the second oil outlet pipe is connected to a third oil outlet pipe via an oil cavity. A fourth oil outlet pipe connecting the oil cavity to the second cylinder is provided on its wall. A valve assembly that can only be opened under the action of internal oil pressure is provided at the upper end of the second oil outlet pipe.

[0016] In one embodiment, the valve assembly includes a baffle hinged to the upper end of the second oil outlet pipe, and a leaf spring is connected between the baffle and the inner wall of the oil chamber.

[0017] In one embodiment, the inner wall of the first filter cartridge is densely covered with messy soft bristles.

[0018] In one embodiment, the outer wall of the second filter cartridge is provided with a plurality of centrifugal slats to enhance its centrifugal effect.

[0019] The beneficial effects of this invention are: 1. The cover plate assembly of the present invention integrates an oil pump assembly and an oil circuit conversion assembly, which effectively improves the degree of integration.

[0020] 2. In this invention, the oil pump assembly, via a first pumping gear mounted on a first rotating shaft, can rotate at a certain angle relative to the first rotating shaft when the oil pressure inside the pump housing is too high. This causes the first pumping gear to move axially a certain distance under its threaded engagement with the first rotating shaft. Ultimately, this results in a gap being formed between the first and second pumping gears and the inner wall of the pump housing and the sealing plate, directly connecting the oil inlet and outlet inside the pump housing. This effectively relieves pressure inside the pump housing and reduces the amount of oil pumped by the oil pump assembly. Consequently, it reduces the vibration of the first and second pumping gears caused by force, preventing loosening of the first and second pumping gears due to vibration caused by excessive force during long-term use.

[0021] 3. The oil circuit switching assembly in this invention utilizes the power of the second rotating shaft in the oil pump assembly to drive the centrifugal blades on the second filter cartridge to rotate rapidly. This increases the centrifugal force of the oil pumped into the annular space between the first cylinder and the second filter cartridge via the first oil outlet pipe, ensuring that the oil pumped into the annular space between the first cylinder and the second filter cartridge via the first oil outlet pipe can be effectively filtered through the first filter cartridge and reach the crankcase or other parts requiring lubrication via the fourth oil outlet pipe, oil chamber, and third oil outlet pipe. When the first filter cartridge becomes clogged after prolonged use, the oil circuit switching assembly in this invention closes the first oil passage on the first cylinder by rotating the third cylinder. This allows the oil pumped into the annular space between the first cylinder and the second filter cartridge via the first oil outlet pipe to reach a certain pressure, overcoming the centrifugal force generated by the centrifugal blades on the second filter cartridge. The oil then reverses direction, passing through the second filter cartridge and entering the second annular sleeve. The valve assembly opens via the second oil outlet pipe, allowing the oil to reach the crankcase or other parts requiring lubrication. This prevents the oil from adversely affecting the crankcase operation due to unfiltered impurities after the first filter cartridge becomes clogged.

[0022] 4. The densely packed, messy soft bristles on the inner wall of the first filter cartridge in the oil circuit conversion assembly of this invention can lock in the impurities blocked by the first filter cartridge, preventing the impurities at the filter from re-entering the engine oil. This facilitates the removal of impurities from the engine oil when the first filter cartridge is replaced later, effectively reducing the impurity content of the engine oil and improving the filtration efficiency of the newly replaced first filter cartridge. Attached Figure Description

[0023] Figure 1 This is an overall schematic diagram of the invention; Figure 2 This is a cross-sectional view of the crankcase and cover plate assembly in this invention. Figure 3 This is a sectional view of the connection structure between the side end cover and the crankcase in the cover plate assembly; Figure 4 This is a cross-sectional view of the transmission connection between the first rotating shaft of the oil pump assembly and the crankshaft end in the cover plate assembly; Figure 5 This is a schematic diagram of the cover plate assembly; Figure 6 This is a cross-sectional view of the oil pump assembly and the oil circuit conversion assembly in the cover plate assembly. Figure 7 This is a cross-sectional view of the top structure of the oil circuit conversion assembly; Figure 8 This is a cross-sectional view of the structure in which the first oil outlet pipe connects to the first cylinder in the oil pump assembly; Figure 9 This is a cross-sectional view of the engagement of the first and second pump gears in the oil pump assembly. Figure 10 This is a side end cap and its cross-sectional view; Figure 11 This is a cross-sectional view of the first pump oil gear structure; Figure 12 This is a schematic diagram of the second pump oil gear structure; Figure 13 This is the first rotating shaft structure and its cross-sectional view; Figure 14 It is a sealing plate and its cross-sectional view; Figure 15 These are cross-sectional views of the first and second cylindrical structures. Figure 16 This is a cross-sectional view of the structure of the second filter cartridge; Figure 17 This is a cross-sectional view of the structure on the third cylinder; Figure 18 This is a cross-sectional view of the first filter cartridge; Figure 19 This is a cross-sectional view of the sealing cap structure; Labels in the diagram: 101. Crankcase; 102. Crankshaft end; 200. Cover plate assembly; 201. Side end cover; 202. First shaft hole; 203. First sealing gasket; 204. Oil pump assembly; 205. Pump housing; 206. Oil inlet; 207. Oil outlet; 208. Oil suction pipe; 209. First oil outlet pipe; 210. Oil pressure sensor; 211. First pump gear; 212. Fourth shaft hole; 213. Internal thread; 215. Limiting groove; 216. First annular groove; 217. Second annular groove; 218. First rotating shaft; 219. Ring 220. Convex; 221. Guide key; 222. Limiting block; 222. External thread; 223. First ring sleeve; 224. Keyway; 225. Swivel spring; 226. First limiting sleeve; 227. First gear; 228. Second gear; 229. Second pump gear; 230. Second rotating shaft; 231. Hexagonal groove; 233. Second limiting sleeve; 234. Sealing plate; 235. Guide ring; 236. Guide sleeve; 237. Sealing cap; 238. Oil circuit conversion assembly; 239. First ring plate; 240. Second ring sleeve; 241. Second ring plate; 242. Third ring sleeve; 243. First cylinder; 244. First oil passage hole; 245. Third ring plate; 246. First slot; 247. Second cylinder; 248. Second oil outlet pipe; 249. Oil chamber; 250. Third oil outlet pipe; 251. Fourth oil outlet pipe; 252. Valve assembly; 253. Baffle; 254. Leaf spring; 255. Second sealing gasket; 256. First filter cartridge; 257. Soft bristles; 258. Third... 259. Cylinder; 260. Second oil passage hole; 261. Rotary seat; 262. Fourth ring sleeve; 263. Second filter cylinder; 264. Connecting rod; 265. Hexagonal shaft; 266. Positioning shaft; 267. Centrifugal plate; 268. Rotary sealing sleeve; 269. Sealing cover; 270. Second slot; 271. Third slot; 272. Fourth slot; 273. First sealing ring; 274. Second sealing ring; 275. Third sealing ring; 276. Second shaft hole; 277. Third shaft hole. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0025] The serial numbers assigned to components in this document, such as "first," "second," etc., are merely used to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] like Figure 1-19 As shown, an engine crankcase 101 cover plate assembly 200 and a crankcase 101 include: A cover plate assembly 200, located at the side opening of the crankcase 101, seals the side opening of the crankcase 101 and lubricates the internal components of the crankcase 101 using engine oil at the bottom of the crankcase 101. The cover plate assembly 200 includes a side end cover 201 for sealing the side opening of the crankcase 101. The side end cover 201 has a first shaft hole 202 for rotating with the crankshaft. The lower side of the side end cover 201 is provided with a mechanism for drawing engine oil from the bottom of the crankcase 101 using the power of the crankshaft. 01 An oil pump assembly for lubricating internal components, wherein the oil pump assembly 204 has the structural feature of automatically depressurizing and failing when the internal oil pressure is too high, and automatically resuming effective operation when the internal oil pressure returns to normal; an oil circuit conversion assembly 238 is provided on the outside of the oil pump assembly 204 to filter the oil output by using its power, wherein the oil circuit conversion assembly 238 has the structural feature of providing two interchangeable filter oil circuits for the oil from the oil pump assembly 204, both of which have a filtering function.

[0028] In a further embodiment, such as Figure 1 , Figure 3As shown, the side end cover 201 is connected to the side end of the crankcase 101 by bolts, and a first sealing gasket 203 is provided between the side end cover 201 and the crankcase 101.

[0029] In one embodiment, and in a further embodiment, such as Figure 4 , Figure 5 , Figure 6 , Figure 8 , Figure 9 As shown, the oil pump assembly 204 includes a pump housing 205 with an open lower end. An oil inlet 206 and an oil outlet 207 are respectively provided on both sides of the middle portion of the pump housing 205. The oil inlet 206 is connected to the bottom of the crankcase 101 via an oil suction pipe 208. The oil outlet 207 is connected to an oil circuit conversion assembly via a first oil outlet pipe 209. A second shaft hole 276 and a third shaft hole 277 are provided on the top of the pump housing 205, symmetrically distributed around the oil inlet. On both sides of the axis of the port 206 or the oil outlet 207, a first rotating shaft 218 and a second rotating shaft 230, which are rotatably connected to the crankshaft end 102, are respectively installed in the second shaft hole 276 and the third shaft hole 277. A first pumping gear 211 with clearance fit to the inner wall of the pump housing 205 is provided on the first rotating shaft 218. A second annular groove 217 is formed on the inner wall of the fourth shaft hole 212 of the first pumping gear 211. The inner wall of the second annular groove 217 at the upper end of the fourth shaft hole 212 is provided with a... An internal thread 213 mates with the external thread 222 on the first rotating shaft 218. A limiting groove 215 mates with the upper limit block 221 on the upper limit block 221 of the first rotating shaft 218 is formed on the inner wall of the second annular groove 217 at the lower end of the fourth shaft hole 212. A first ring sleeve 223 is slidably disposed on the first rotating shaft 218 and rotatably disposed within the second annular groove 217. A spiral spring 225 connects the first ring sleeve 223 and the inner wall of the second annular groove 217. The second rotating shaft 230 is provided with... A second pumping gear 229 meshes with the first pumping gear 211 and has a clearance fit with the inner wall of the pump housing 205. A sealing plate 234 is vertically slidable inside the pump housing 205 to seal it. A guide ring 235 is provided on the inner side of the sealing plate 234. The guide ring 235 is rotatably disposed in the first annular groove 216 on the lower end face of the first pumping gear 211. A sealing cap 237 is bolted to the lower end opening of the pump housing 205 to block it. The sealing cap 237 has an air pressure balance hole.

[0030] In a further embodiment, such as Figure 9 As shown, an oil pressure sensor 210 is installed on the wall of the first oil outlet pipe 209 via a branch pipe.

[0031] In one embodiment, and in a further embodiment, such as Figure 6 , Figure 13As shown, the upper end of the second rotating shaft 230 is bolted with a second limiting sleeve 233 that mates with the top of the pump housing 205. The top of the pump housing 205 is bolted with a first limiting sleeve 226 that rotatably mates with the annular protrusion 219 on the first rotating shaft 218. The first rotating shaft 218 is provided with two guide keys 220 that are 180 degrees apart circumferentially. The guide keys 220 slide in the keyway 224 on the inner wall of the first annular sleeve 223. The sealing plate 234 is provided with a guide sleeve 236 that slidably mates with the inner wall of the pump housing 205. A second sealing gasket 255 mates between the first annular plate 239 and the pump housing 205.

[0032] In a further embodiment, such as Figure 4 As shown, a first gear 227 is provided at the upper end of the first rotating shaft 218, and the first gear 227 meshes with the second gear 228 at the crankshaft end 102.

[0033] In a further embodiment, such as Figure 6 Figure 7 , Figure 8As shown, the oil circuit conversion assembly 238 includes a first annular plate 239 bolted to the top of the pump housing 205. A second annular sleeve 240 and a first cylinder 243, both coaxial, are mounted on the first annular plate 239. An annular gap exists between the first cylinder 243 and the second annular sleeve 240. A third annular plate 245 is mounted on the outer side of the first cylinder 243. A second cylinder 247 is mounted on the third annular plate 245. An annular space exists between the second cylinder 247 and the first cylinder 243. First oil passage holes 244 are evenly distributed on the wall of the first cylinder 243, and these holes are located above the third annular plate 245. The second annular sleeve 240... A third ring sleeve 242 is provided at the upper end via a second ring plate 241. A second filter cylinder 262 with an upper end sealed is inserted into the third ring sleeve 242. A rotary sealing sleeve 268 is fitted between the second filter cylinder 262 and the third ring sleeve 242. A hexagonal shaft 264 that mates with the hexagonal groove 231 at the upper end of the second rotating shaft 230 is provided at the lower end of the second filter cylinder 262 via a connecting rod 263. A first slot 246 is provided on the third ring plate 245. A first filter cylinder 256 that divides the annular space between the second cylinder 247 and the first cylinder 243 into two annular spaces is inserted into the first slot 246. The outer side of the first cylinder 243 is provided with an upper end sealed. The third cylinder 258 has evenly distributed second oil passages 259 on its wall, each corresponding to a first oil passage 244. A positioning shaft 265 is located at the top of the second filter cylinder 262, within a rotating seat 260 at the top of the third cylinder 258. A sealing cap 269 is threaded to the top of the second cylinder 247. The top of the sealing cap 269 has a second slot 270 that mates with the second cylinder 247, a third slot 271 that mates with the first filter cylinder 256, and a fourth slot 272 that mates with the fourth ring 261 at the top of the third cylinder 258. The inner wall of the second slot 270 is flush with the second cylinder 258. A first sealing ring 273 is fitted between the cylinders 247. A second sealing ring 274 is fitted between the inner wall of the third slot 271 and the inner and outer walls of the first filter cylinder 256. A third sealing ring 275 is fitted between the inner and outer walls of the fourth slot 272 and the fourth ring 261. A second oil outlet pipe 248 communicating with the inner wall of the second ring 240 is provided on the wall surface. The upper end of the second oil outlet pipe 248 is connected to a third oil outlet pipe 250 through an oil cavity 249. A fourth oil outlet pipe 251 communicating with the second cylinder 247 is provided on the wall surface of the oil cavity 249. A valve assembly 252 that can only be opened under the action of oil pressure is provided at the upper end of the second oil outlet pipe 248.

[0034] In a further embodiment, such as Figure 7As shown, the valve assembly 252 includes a baffle 253, which is hinged to the upper end of the second oil outlet pipe 248. A leaf spring 254 is connected between the baffle 253 and the inner wall of the oil chamber 249.

[0035] In a further embodiment, such as Figure 18 As shown, the inner wall of the first filter cylinder 256 is densely covered with messy soft bristles 257.

[0036] In a further embodiment, such as Figure 7 , Figure 16 As shown, the outer wall of the second filter cylinder 262 is provided with a plurality of centrifugal slats 266 to enhance its centrifugal effect.

[0037] The cover plate assembly 200 of this invention integrates an oil pump assembly 204 and an oil circuit conversion assembly 238, effectively improving the integration level. In this invention, the oil pump assembly 204, via a first pumping gear 211 mounted on a first rotating shaft 218, can rotate relative to the first rotating shaft 218 at a certain angle when the oil pressure inside the pump housing 205 is too high. This causes the first pumping gear 211 to move axially a certain distance under its threaded engagement with the first rotating shaft 218. Ultimately, this results in a gap forming between the first pumping gear 211 and the second pumping gear 229, the inner wall of the pump housing 205, and the sealing plate 234, directly connecting the inlet 206 and the outlet 207 inside the pump housing 205. This effectively relieves pressure inside the pump housing 205 and reduces the pumping volume of the oil pump assembly, thereby reducing the vibration of the first pumping gear 211 and the second pumping gear 229 caused by force, and preventing loosening of the first pumping gear 211 and the second pumping gear 229 due to vibration caused by excessive force during long-term use. In this invention, the oil circuit conversion component 238 utilizes the power of the second rotating shaft 230 in the oil pump assembly to drive the centrifugal blades 266 on the second filter cylinder 262 to rotate rapidly. This increases the centrifugal force of the oil pumped into the annular space between the first cylinder 243 and the second filter cylinder 262 via the first oil outlet pipe 209. This ensures that the oil pumped into the annular space between the first cylinder 243 and the second filter cylinder 262 via the first oil outlet pipe 209 can be effectively filtered through the first filter cylinder 256 and reach the crankcase 101 or the parts requiring lubrication via the fourth oil outlet pipe 251, the oil chamber 249, and the third oil outlet pipe 250. When the oil circuit conversion component 238 of the present invention becomes clogged after prolonged use of the first filter cartridge 256, it closes the first oil passage 244 on the first cylinder 243 by rotating the third cylinder 258. This allows the oil pumped into the annular space between the first cylinder 243 and the second filter cartridge 262 through the first oil outlet pipe 209 to reach a certain pressure, which overcomes the centrifugal force generated by the centrifugal blades 266 on the second filter cartridge 262. The oil then flows in the opposite direction, being filtered by the second filter cartridge 262, into the second ring sleeve 240, and through the second oil outlet pipe 248, opens the valve assembly 252 to reach the crankcase 101 or the parts that need lubrication. This prevents the oil from being blocked in the first filter cartridge 256 and causing adverse effects on the operation of the crankcase 101 when it reaches the lubrication points due to the lack of filtration of impurities. In this invention, the densely packed, messy soft bristles 257 on the inner wall of the first filter cartridge 256 in the oil circuit conversion assembly 238 can lock in the impurities blocked by the first filter cartridge 256, preventing the impurities at the filter from re-entering the engine oil. This facilitates the removal of impurities from the engine oil when the first filter cartridge 256 is replaced later, effectively reducing the impurity content of the engine oil and improving the filtration efficiency of the newly replaced first filter cartridge 256.

[0038] The operation flow of this invention is as follows: In the initial state, the spiral spring 225 is compressed, and the limiting block 221 is located at the extreme position at one end of the limiting groove 215 under the action of the spiral spring 225. There are small gaps between the first pump gear 211 and the second pump gear 229 and the inner wall of the pump housing 205 and the inner wall of the sealing plate 234. The second oil passage hole 259 on the third cylinder 258 is opposite to the first oil passage hole 244 on the first cylinder 243 and is in the open state for the first oil passage hole 244 on the first cylinder 243. There are gaps between the sealing cover 269 and the fourth ring 261, the first filter cylinder 256 and the upper end of the second cylinder 247. The baffle 253 in the valve assembly 252 is in the closed state for the second oil outlet pipe 248 under the action of the leaf spring 254. The first filter cylinder 256 and the second filter cylinder 262 are both newly replaced.

[0039] At this time, the engine is started, and the crankshaft end 102 of the engine rotates. The crankshaft end 102 drives the first rotating shaft 218 to rotate through the second gear 228 and the first gear 227. The first rotating shaft 218 drives the first oil pumping gear 211 to rotate through the first ring sleeve 223 and the spiral spring 225. The first oil pumping gear 211 drives the second oil pumping gear 229 to rotate. The rotation of the first oil pumping gear 211 and the second oil pumping gear 229 causes the engine oil at the bottom of the crankcase 101 to flow through the oil suction pipe 208 and the oil inlet. 206. Pump housing 205, oil outlet 207, and first oil outlet pipe 209 enter the first cylinder 243. The second pump gear 229 drives the second rotating shaft 230 to rotate synchronously. The second rotating shaft 230 drives the second filter cylinder 262 to rotate synchronously via the hexagonal shaft 264 and connecting rod 263. The rotating second filter cylinder 262 drives all the centrifugal blades 266 on it to rotate synchronously and rapidly. The centrifugal blades 266 cause the oil entering the first cylinder 243 to generate a large centrifugal force. The engine oil in cylinder 43 enters the first filter cylinder 256 through the first oil passage 244 on the first cylinder 243 and the second oil passage 259 on the third cylinder 258. The engine oil entering the first filter cylinder 256 is filtered by centrifugal pressure and then enters the second cylinder 247. The engine oil entering the second cylinder 247 is then pressurized and enters the oil chamber 249 through the fourth oil outlet pipe 251. The engine oil entering the oil chamber 249 then reaches the crankcase 101 through the third oil outlet pipe 250. The parts requiring lubrication or recirculation to the crankcase 101, while the oil entering the oil chamber 249 will not enter the second ring sleeve 240 from the second oil outlet pipe 248 because the baffle 253 closes the second oil outlet pipe 248 under the action of the leaf spring 254. The messy soft hairs 257 on the inner wall of the first filter cartridge 256 can trap impurities in the oil and prevent impurities filtered by the first filter cartridge 256 from returning to the oil. When the first filter cartridge 256 is replaced, the impurities are carried out, effectively reducing the impurities in the oil.

[0040] After a period of use, the soft bristles 257 on the inner wall of the first filter cartridge 256 become clogged due to the accumulation of impurities. At this time, the second filter cartridge 262 drives all the centrifugal blades 266 on it to rotate rapidly, causing the oil entering the first cylinder 243 to become trapped. This results in the oil pressure in the pump housing 205 of the oil pump assembly rising. At this time, the oil pressure sensor 210 installed on the branch pipe of the first oil outlet pipe 209 detects the rise in oil pressure and sends a signal. The first pumping gear 211 and the second pumping gear 229 in the pump housing 205 are subjected to... As resistance increases and rotation lags behind the first rotating shaft 218, the spiral spring 225 is further compressed, and the limiting block 221 moves from one end of the limiting groove 215 to the limit position at the other end. At the same time, the first pumping gear 211 moves axially a certain distance under the interaction of the external thread 222 on the first rotating shaft 218 and the internal thread 213 on the inner wall of the first pumping gear 211. The first pumping gear 211 drives the sealing plate 234 to move axially synchronously through the guide ring 235, ultimately causing the first pumping gear 211 and the second pumping gear 229 to interact with the pump housing 205 and the sealing plate. A large gap is created between the inner walls of 234, allowing the oil inlet 206 and oil outlet 207 on both sides of the pump housing 205 to be directly connected. This reduces the oil pressure inside the pump housing 205 and decreases the pumping volume of the first pumping gear 211 and the second pumping gear 229. The oil in the first cylinder 243, under oil pressure, flows backward through the second filter cylinder 262 and into the second filter cylinder 262 and the second ring 240. The amount of oil entering the second filter cylinder 262 and the second ring 240 gradually increases. When the second filter cylinder 262 and the second ring 240... When the oil in the second oil outlet pipe 240 and the second oil outlet pipe 248 accumulates to a certain amount and obtains a certain oil pressure, the baffle 253 in the valve assembly 252 will open under the action of the lower oil pressure, overcoming the leaf spring 254. The oil in the second oil outlet pipe 248 enters the crankcase 101 and the parts that need lubrication through the oil chamber 249 and the third oil outlet pipe 250, or enters the second cylinder 247 through the fourth oil outlet pipe 251. The oil entering the second cylinder 247 also enters the crankcase 101 and the parts that need lubrication through the fourth oil outlet pipe 251, the oil chamber 249 and the third oil outlet pipe 251.

[0041] If the oil pressure remains high, it indicates that the first filter cartridge 256 is clogged and needs to be replaced. If the oil pressure gradually decreases and returns to normal after reaching high pressure, it indicates that the oil pressure inside the pump housing 205 of the oil pump assembly 204 is due to the short-term high rotational speed of the first oil pumping gear 211 on the first rotating shaft 218 driven by the crankshaft end 102, causing a short-term increase in the pumping volume of the first oil pumping gear 211 and the second oil pumping gear 229. After the speed of the first rotating shaft 218 driven by the crankshaft end 102 decreases, the pumping volume of the first oil pumping gear 211 and the second oil pumping gear 229 decreases due to the decrease in rotational speed, thus reducing the pumping volume of the first oil pumping gear 211 and the second oil pumping gear 229. The resistance experienced by the second pumping gear 229 gradually decreases, eventually causing the first pumping gear 211 to rotate back to its original position relative to the first rotating shaft 218 under the action of the spiral spring 225 and rotate synchronously with the first rotating shaft 218. The first pumping gear 211 is axially reset relative to the first rotating shaft 218, and the first pumping gear 211 drives the sealing plate 234 to reset. Finally, the first pumping gear 211 and the second pumping gear 229 complete the initial small gap fit with the pump housing 205 and the inner wall of the sealing plate 234, thereby blocking the oil inlet 206 and the oil outlet 207 on the pump housing 205, so that the oil pump assembly can perform normal oil pumping operation.

[0042] When the first filter cartridge 256 becomes clogged and the oil passage needs to be switched, the sealing cap 269 is rotated. The sealing cap 269, through the two third sealing rings 275, causes the third cylinder 258 to rotate at a small angle relative to the first cylinder 243, so that the third cylinder 258 closes the first oil passage 244 on the first cylinder 243. This prevents the oil pumped into the first cylinder 243 from moving to the first filter cartridge 256 through the first oil passage 244 on the first cylinder 243. When the oil pressure in the first cylinder 243 reaches a certain level, it will overcome the centrifugal force of the centrifugal blades 266 on the second filter cartridge 262 and enter the second filter cartridge 262 in the opposite direction. The oil in the second filter cartridge 262 passes through the second ring 240 and the second oil outlet pipe 248, which pushes open the baffle 253, and then enters the oil chamber 249. The oil in the oil chamber 249 reaches the parts in the crankcase 101 that need lubrication through the third oil outlet pipe 250.

Claims

1. An engine crankcase cover assembly, characterized in that, include: A cover plate assembly installed at the side opening of the crankcase is used to seal the side opening of the crankcase and to lubricate the internal components of the crankcase using the engine oil at the bottom of the crankcase. The cover plate assembly includes a side end cover for sealing the side opening of the crankcase. The side end cover has a first shaft hole that rotates with the crankshaft. An oil pump assembly is installed on the lower side of the side end cover to draw engine oil from the bottom of the crankcase using the power of the crankshaft to lubricate the internal components of the crankcase. An oil circuit conversion assembly is installed on the outside of the oil pump assembly to filter the oil output by the power of the oil pump assembly. The oil pump assembly includes a pump housing with an open lower end. An oil inlet and an oil outlet are located on opposite sides of the middle portion of the pump housing. The oil inlet is connected to the bottom of the crankcase via a suction pipe, and the oil outlet is connected to an oil circuit conversion assembly via a first outlet pipe. A second shaft hole and a third shaft hole are symmetrically distributed on either side of the axis of the oil inlet or outlet. A first rotating shaft and a second rotating shaft, respectively, are rotatably mounted within the second and third shaft holes and are connected to the crankshaft end via a transmission. A first pump gear is mounted on the first rotating shaft and has a clearance fit with the inner wall of the pump housing. A second annular groove is formed on the inner wall of the fourth shaft hole of the first pump gear. A groove is formed on the inner wall of the upper end of the second annular groove of the fourth shaft hole, corresponding to the first... The shaft has an external thread that engages with an internal thread. The inner wall of the second annular groove at the lower end of the fourth shaft hole is provided with a limiting groove that engages with the upper limit block of the first shaft. A first ring sleeve is slidably disposed on the first shaft. The first ring sleeve is rotatably disposed in the second annular groove. A spiral spring is connected between the first ring sleeve and the inner wall of the second annular groove. A second pumping gear is disposed on the second shaft that meshes with the first pumping gear and is clearance-fitted with the inner wall of the pump housing. A sealing plate is vertically slidably disposed inside the pump housing to seal it. A guide ring is disposed on the inner side of the sealing plate. The guide ring is rotatably disposed in the first annular groove on the lower end face of the first pumping gear. A sealing cap is installed at the lower end opening of the pump housing by bolts to seal it. An air pressure balance hole is provided on the sealing cap. The oil circuit conversion assembly includes a first annular plate bolted to the top of the pump housing. The first annular plate has a coaxial second annular sleeve and a first cylinder. An annular gap exists between the first cylinder and the second annular sleeve. A third annular plate is located on the outer side of the first cylinder, and a second cylinder is mounted on the third annular plate. An annular space exists between the second cylinder and the first cylinder. The first cylinder has evenly distributed first oil passages on its wall, located above the third annular plate. A third annular sleeve is mounted on the upper end of the second annular sleeve via the second annular plate. A second filter cylinder with a sealed upper end is inserted into the third annular sleeve. A rotary sealing sleeve mates between the second filter cylinder and the third annular sleeve. A hexagonal shaft with a hexagonal groove at the upper end of the second rotating shaft is mounted on the lower end of the second filter cylinder via a connecting rod. A first slot is provided on the third annular plate, into which a first filter cylinder is inserted, dividing the annular space between the second cylinder and the first cylinder into two annular spaces. A third annular sleeve with a sealed upper end is located on the outer side of the first cylinder. The third cylinder has evenly distributed second oil passages on its wall, each corresponding to a first oil passage. A positioning shaft is located at the top of the second filter cylinder, within a rotating seat at the top of the third cylinder. A sealing cap is threaded to the top of the second cylinder. The top of the sealing cap has a second slot that mates with the second cylinder, a third slot that mates with the first filter cylinder, and a fourth slot that mates with a fourth ring at the top of the third cylinder. A first sealing ring mates between the inner wall of the second slot and the second cylinder. A second sealing ring mates between the inner wall of the third slot and the inner and outer walls of the first filter cylinder. A third sealing ring mates between the inner wall of the fourth slot and the inner and outer walls of the fourth ring. A second oil outlet pipe communicating with the inner surface of the second ring is located on its wall. The upper end of the second oil outlet pipe is connected to a third oil outlet pipe via an oil cavity. A fourth oil outlet pipe communicating with the second cylinder is located on the wall of the oil cavity. A valve assembly that can only be opened under internal oil pressure is located at the upper end of the second oil outlet pipe.

2. The engine crankcase cover assembly according to claim 1, characterized in that, The side end cover is connected to the side end of the crankcase by bolts, and a first sealing gasket is provided between the side end cover and the crankcase.

3. The engine crankcase cover assembly according to claim 1, characterized in that, An oil pressure sensor is installed on the wall of the first oil outlet pipe via a branch pipe.

4. The engine crankcase cover assembly according to claim 1, characterized in that, The upper end of the second rotating shaft is bolted with a second limiting sleeve that mates with the top of the pump housing. The top of the pump housing is bolted with a first limiting sleeve that rotatably mates with the annular protrusion on the first rotating shaft. The first rotating shaft is provided with two guide keys that are 180 degrees apart circumferentially. The guide keys slide in the keyway on the inner wall of the first annular sleeve. The sealing plate is provided with a guide sleeve that slidably mates with the inner wall of the pump housing. A second sealing gasket is provided between the first annular plate and the pump housing.

5. The engine crankcase cover assembly according to claim 1, characterized in that, The upper end of the first rotating shaft is provided with a first gear, which meshes with a second gear at the crankshaft end.

6. The engine crankcase cover assembly according to claim 1, characterized in that, The valve assembly includes a baffle that is hinged to the upper end of the second oil outlet pipe, and a leaf spring is connected between the baffle and the inner wall of the oil chamber.

7. The engine crankcase cover assembly according to claim 1, characterized in that, The inner wall of the first filter cartridge is densely covered with messy soft bristles.

8. The engine crankcase cover assembly according to claim 1, characterized in that, The outer wall of the second filter cartridge is provided with several centrifugal slats to enhance its centrifugal effect.

Images