Engine

Abstract

The engine comprises an oil pan, a crankcase and a lubricating system, the crankcase is connected with the oil pan, the lubricating system comprises a pressure limiting valve, the pressure limiting valve comprises a valve body, a valve element, an elastic piece and a first sealing piece, a pressure adjusting cavity, a first mounting opening and a second mounting opening are formed in the valve body, and the first sealing piece and the second sealing piece are arranged in the length direction of the valve body. The valve element, the elastic piece and the first sealing piece are sequentially installed in the pressure adjusting cavity, and the elastic piece is arranged between the valve element and the first sealing piece and abuts against the valve element and the first sealing piece. The valve element and the elastic piece are installed in the pressure adjusting cavity through the first installation opening, and the first sealing piece is installed in the pressure adjusting cavity through the second installation opening. Through the arrangement, the assembling efficiency of the pressure limiting valve is improved, and the engine cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and in particular to an engine. Background Art

[0002] The pressure limiting valve is an oil pump output pressure regulating valve, which mainly controls the pressure range of the engine oil to ensure lubrication and cooling of each part. The pressure limiting valve plays a very important role in the circulating lubrication system. If the oil pressure is too high or too low, it will affect the normal operation and life of the engine.

[0003] The pressure limiting valve has a cavity for accommodating a spring, and conventional pressure limiting valves mostly use bolts to seal the cavity. That is, the spring is first installed in the cavity, and then the bolts are pushed to the end of the spring to seal the cavity. The above assembly method makes the assembly process of the pressure limiting valve cumbersome and costly. Utility Model Content

[0004] In order to solve the deficiencies of the prior art, the utility model aims to provide an engine, the assembly process of the pressure limiting valve of the engine is simple and the cost is low.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] An engine comprises an oil pan, a crankcase and a lubrication system, wherein the crankcase is connected to the oil pan and forms an oil storage space for storing lubricating oil with the oil pan, and an oil passage communicating with the oil storage space is formed on the side of the crankcase facing the oil pan; the lubrication system comprises a pressure control component, which is installed on the crankcase and connected to the lubricating oil circuit, and the pressure control component controls the circulation of the lubricating oil in the lubricating oil circuit, and the pressure control component comprises an oil pump and a pressure limiting valve connected to the oil pump; the pressure limiting valve comprises a valve body, a valve core, an elastic member and a first sealing member, and the valve body is formed with a pressure regulating chamber, a first mounting port and a second mounting port, and along the length direction of the valve body, the valve core, the elastic member and the first sealing member are sequentially installed in the pressure regulating chamber, and the elastic member is arranged between the valve core and the first sealing member and respectively abuts against the valve core and the first sealing member; wherein the valve core and the elastic member are installed in the pressure regulating chamber through the first mounting port, and the first sealing member is installed in the pressure regulating chamber through the second mounting port.

[0007] Furthermore, a reference plane perpendicular to the extension direction of the pressure regulating chamber is defined, the projection of the first seal along the extension direction of the pressure regulating chamber on the reference plane is defined as a first projection plane, the projection of the first mounting port along the extension direction of the pressure regulating chamber on the reference plane is defined as a second projection plane, and the first projection plane basically covers the second projection plane.

[0008] Further, the valve body comprises a valve tail, which is arranged around the outer edge of the first installation port, and the second installation port is located at the valve tail.

[0009] Further, the valve tail includes a limiting portion that limits the first seal in the radial direction of the first mounting port. When observed from the assembling direction of the first seal, the limiting portion is located between the first mounting port and the second mounting port.

[0010] Further, the valve body further includes a first pressure-limiting chamber and a second pressure-limiting chamber that communicate with the pressure-regulating chamber. The valve core moves along the extending direction of the pressure-regulating chamber to increase or decrease the gap between the first pressure-limiting chamber and the second pressure-limiting chamber.

[0011] Further, the pressure-limiting valve further includes a second seal embedded in the first mounting port and / or the second mounting port.

[0012] Further, the first seal is made of a metal material, and the hardness of the first seal is greater than 50 HRC.

[0013] Further, the engine further includes an oil strainer. The oil strainer is installed in the oil storage space and communicates with the oil port. The oil pan includes a bottom wall and a support structure. The support structure extends from the bottom wall towards the crankcase; the oil strainer includes a mounting structure. The oil strainer is connected to the crankcase through the mounting structure. At least part of the mounting structure is embedded in the oil port, and one side of the mounting structure facing away from the crankcase abuts against the support structure.

[0014] Further, the mounting structure includes a first limiting portion, and a second limiting portion that cooperates with the first limiting portion is provided on one side of the crankcase facing the oil pan. The first limiting portion and the second limiting portion are mutually engaged.

[0015] Further, the mounting structure includes two first limiting portions in a columnar shape. A preset gap is formed between the two first limiting portions. When the oil strainer is connected to the crankcase, the second limiting portion is located in the preset gap, and the two first limiting portions limit the second limiting portion along the width direction of the preset gap.

[0016] The engine seals the first mounting port through the first seal located in the pressure-regulating chamber, and through the acting force applied by the elastic member on the first seal, it prevents the first seal from disengaging from the position of the first mounting port. Compared with sealing the first mounting port through bolts, the method of sealing the first mounting port through the first seal can improve the assembly efficiency of the pressure-limiting valve and reduce the cost of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the engine provided by the embodiment of the present application;

[0018] Figure 2 is an exploded view of the crankcase of the engine provided by the embodiment of the present application;

[0019] Figure 3 is a bottom view of the upper housing of the engine provided by the embodiment of the present application;

[0020] Figure 4 is Figure 3 the partial enlarged view of A in;

[0021] Figure 5 is the schematic structural view of the crankcase of the engine provided by the embodiment of the present application;

[0022] Figure 6 is the first schematic structural view of the oil pan of the engine provided by the embodiment of the present application;

[0023] Figure 7 is the second schematic structural view of the oil pan of the engine provided by the embodiment of the present application;

[0024] Figure 8 is the schematic structural view of the lower crankcase of the engine provided by the embodiment of the present application;

[0025] Figure 9 is the schematic view of the lubricating oil path of the engine provided by the embodiment of the present application;

[0026] Figure 10 is the schematic view of the pressure control component of the engine provided by the embodiment of the present application;

[0027] Figure 11 is the sectional view of the pressure control component of the engine provided by the embodiment of the present application along the I-I direction;

[0028] Figure 12 is the exploded view of the pressure limiting valve of the engine provided by the embodiment of the present application. Detailed implementation manners

[0029] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the specific embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

[0030] The terms used in the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. "First", "second", "third", "fourth" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first", "second", "third", "fourth" may explicitly or implicitly include at least one of the features. The singular forms "a", "the" and "said" used in the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0031] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0032] As Figure 1 shown, the present application provides an engine 100, which can be used as a power supply device for vehicles such as automobiles and motorcycles. In an embodiment of the present application, the engine 100 belongs to a reciprocating piston internal combustion engine, which can convert the chemical energy of fuel into the mechanical energy of piston movement and output power externally. The engine 100 includes an outer housing 10, and the outer housing 10 constitutes the main frame of the engine 100. The outer housing 10 includes an oil pan 11, a crankcase 12, a cylinder block 13, a cylinder head 14 and a cylinder head cover 15 connected in sequence from bottom to top.

[0033] As Figure 2 shown, as an implementation, the crankcase 12 includes an upper housing 121 and a lower housing 122. The upper housing 121 and the lower housing 122 are fixedly connected by a mating bolt 123, and an installation space 124 is formed between the upper housing 121 and the lower housing 122. The engine 100 is connected to a transmission, and the engine 100 and the transmission are integrally formed, that is, the crankcase 12 of the engine 100 is reused as the housing of the transmission. The engine includes a crankshaft connecting rod mechanism (not shown in the figure), and the transmission includes a power input shaft 361 and a power output shaft 362. The crankshaft connecting rod mechanism, the power input shaft 361 and the power output shaft 362 are all arranged in the installation space 124, and the rotation axes of the power input shaft 361 and the power output shaft 362 are arranged parallel to each other. The crankshaft connecting rod mechanism meshes with the gear on the power input shaft 361, and the power input shaft and the power output shaft 362 are meshed through gears. The engine 100 drives the crankshaft connecting rod mechanism to rotate by burning a fuel-air mixture, and transmits the power in the direction from the crankshaft connecting rod mechanism, the power input shaft 361 to the power output shaft 362 outside the engine 100.

[0034] As Figure 3As shown in the figure, taking the upper box body 121 as an example, the upper box body 121 includes bolt mounting holes 1212, a first shaft seat 1213, and a second shaft seat 1214. The bolt mounting holes 1212 are used to set the casing bolts 123, and their interiors have threads that cooperate with the casing bolts 123. The first shaft seat 1213 is used to mount the power input shaft 361, and the end of the power input shaft 361 is located at the first shaft seat 1213. The power input shaft 361 can rotate relative to the first shaft seat 1213 along its circumferential direction. The second shaft seat 1214 is used to mount the power output shaft 362, and the end of the power output shaft 362 is located at the second shaft seat 1214. The power output shaft 362 can rotate relative to the second shaft seat 1214 along its circumferential direction.

[0035] The number of the bolt mounting holes 1212 is set to be several. Among them, some bolt mounting holes 1212 are located between the first shaft seat 1213 and the second shaft seat 1214. The upper box body 121 has an oil passage 1215 extending from the first shaft seat 1213 to the second shaft seat 1214, and this oil passage 1215 does not coincide with the bolt mounting holes 1212.

[0036] Through the above settings, the lubricating oil flowing through the power input shaft 361 and the power output shaft 362 is avoided from the bolt mounting holes 1212, preventing the lubricating oil from leaking along the bolt mounting holes 1212 during the lubrication process.

[0037] As Figure 4 shown, as an implementation method, the part between the oil passage 1215 and the bolt mounting holes 1212 is the isolation part 1216 of the upper box body 121. The length L1 of the isolation part 1216 extending along the axial direction of the power input shaft 361 ranges from 2 mm to 20 mm. Further, the length L1 of the isolation part 1216 extending along the axial direction of the power input shaft 361 ranges from 4 mm to 18 mm. More preferably, the length L1 of the isolation part 1216 extending along the axial direction of the power input shaft 361 ranges from 6 mm to 16 mm. It should be noted that if the wall thickness of the isolation part 1216 used to isolate the oil passage 1215 from the bolt mounting holes 1212 is too small, the pressure generated in the oil passage 1215 will cause the lubricating oil to leak from the bolt mounting holes 1212. By setting the isolation part 1216 with a thickness of at least 2 mm, the sealing effect of the oil passage 1215 is ensured.

[0038] Further, the oil passage 1215 includes a first oil passage 1215a located on the first shaft seat 1213 and a second oil passage 1215b located on the second shaft seat 1214. The extending directions of the first oil passage 1215a and the second oil passage 1215b are basically parallel, and the two do not coincide. Compared with the second oil passage 1215b, the position of the first oil passage 1215a is closer to the outside of the installation space 124.

[0039] The oil passage 1215 further includes a third oil passage 1215c, which is located between the first oil passage 1215a and the second oil passage 1215b, and the third oil passage 1215c communicates with the first oil passage 1215a and the second oil passage 1215b. The third oil passage 1215c is substantially arc-shaped to avoid the bolt mounting hole 1212.

[0040] As Figures 2 to 3 shown, the power transmission assembly 36 further includes a bearing member 363 sleeved on the power output shaft 362. The bearing member 363 is mounted on the second shaft seat 1214, and the power transmission assembly 36 is rotatably connected to the crankcase 12 through the bearing member 363. The bearing member 363 covers the second oil passage 1215b, and by reusing the bearing member 363 as a oil seal for the second oil passage 1215b, it is possible to prevent the lubricating oil from leaking along the second oil passage 1215b to the outside of the crankcase 12.

[0041] As an implementation, the bolt mounting hole 1212 of the upper housing 121 is defined as the first bolt mounting hole, and the oil passage 1215 of the upper housing 121 is defined as the upper oil passage. The lower housing 122 has a second bolt mounting hole and a lower oil passage corresponding to the first bolt mounting hole and the upper oil passage respectively. The structure of the lower oil passage is substantially the same as that of the upper oil passage, and there is also a certain interval between the lower oil passage and the second bolt mounting hole, so that the oil path formed by the lower oil passage avoids the second bolt mounting hole. Through the above settings, the sealing performance of the crankcase 12 is ensured, and the lubricating oil is prevented from leaking from the inside of the crankcase 12. Moreover, since the oil passage 1215 avoids the bolt mounting hole 1212, the processing of the oil passage 1215 is simpler.

[0042] As Figure 5 and Figure 6 shown, the engine 100 includes a connected crankcase 12 and an oil pan 11. An oil storage space 111 for storing lubricating oil is formed between the oil pan 11 and the crankcase 12. One side of the crankcase 12 facing the oil pan 11 has an oil port 125 communicating with the oil storage space 111. The lubricating oil path 42 inside the engine 100 obtains lubricating oil from the oil storage space 111 through the oil port 125, and then the lubricating oil circulates in the lubricating oil path 42.

[0043] The engine 100 further includes a lubrication system 40, which is used to obtain lubricating oil from the oil storage space 111 and transmit the lubricating oil along the lubricating oil path 42. The lubrication system 40 includes an oil strainer 41, which is installed in the oil storage space 111 and communicates with the oil port 125. The oil strainer 41 generally adopts a metal filter screen structure, and its main function is to intercept and prevent larger mechanical impurities from entering the lubricating oil path 42. Considering the characteristics of the lubricating oil itself, which has a high viscosity and contains more impurities, through the filtering function of the oil strainer 41, the cleanliness of the lubricating oil can be improved, and thus the lubrication system 40 can be protected.

[0044] As an implementation, the oil pan 11 includes a support structure 112 located within the oil storage space 111, and at least a portion of the support structure 112 extends in the direction of the oil port 125. The oil strainer 41 includes a mounting structure 411. The oil strainer 41 is connected to the crankcase 12 through the mounting structure 411. At least a portion of the mounting structure 411 is embedded in the oil port 125, and the side of the mounting structure 411 facing away from the crankcase 12 abuts against the support structure 112. The oil strainer 41 is snap-fitted to the inner wall of the oil port 125 through the mounting structure 411, thereby limiting the mounting structure 411 in the radial direction of the oil port 125, and further fixing the oil strainer 41. Further, since the support structure 112 supports the mounting structure 411 in the axial direction of the oil port 125, it prevents the mounting structure 411 from disengaging from the oil port 125, limits the mounting structure 411 in the axial direction of the oil port 125, and further fixes the oil strainer 41. Through the above arrangement, the installation and fixation of the oil strainer 41 can be achieved without using fasteners, improving the assembly efficiency of the engine 100 and reducing the number of components of the engine 100.

[0045] Specifically, the oil pan 11 includes a bottom wall 113 and side walls 114 distributed around the outer edge of the bottom wall 113. The oil pan 11 is fixedly connected to the crankcase 12 through the side walls 114. A plurality of fixing holes 1141 are provided on the side walls 114. Fasteners for fixing the oil pan 11 pass through the fixing holes 1141 and are fixedly connected to the crankcase 12. The support structure 112 is provided on the bottom wall 113 and is fixedly connected to the bottom wall 113. The support structure 112 extends from the bottom wall 113 in the direction of the oil port 125, and limits the mounting structure 411 in the axial direction of the oil port 125.

[0046] Exemplarily, the support structure 112 is integrally formed with the bottom wall 113, reducing costs and improving the assembly efficiency of the oil strainer 41.

[0047] Optionally, the support structure 112 and the bottom wall 113 can also be fixedly connected by fasteners. By providing a plurality of bolt holes on the bottom wall 113, it is possible to accommodate support structures 112 with different shapes and lengths. The support structure 112 is fixedly connected to the corresponding bolt holes, making it possible for the engine 100 to be compatible with oil strainers 41 of different models.

[0048] Further, the mounting structure 411 includes a first limiting portion 4111, and a second limiting portion 126 is provided on the side of the crankcase 12 facing the oil pan 11. By the mutual engagement of the first limiting portion 4111 and the second limiting portion 126, the mounting structure 411 is limited in the circumferential direction of the oil port 125.

[0049] In some examples, the mounting structure 411 includes a mounting disk 4112 and two columnar first limiting portions 4111. The first limiting portions 4111 are distributed on the outer edge of the mounting disk 4112, and there is a preset gap 4113 between the two first limiting portions 4111. The second limiting portion 126 is embedded in the preset gap 4113, and the second limiting portion 126 abuts against the first limiting portions 4111 on both sides. The two first limiting portions 4111 limit the second limiting portion 126 in the width direction of the preset gap 4113. Through the mutual cooperation of the first limiting portion 4111 and the second limiting portion 126, the mounting structure 411 is limited to prevent the mounting structure 411 from rotating relative to the crankcase 12 along the circumferential direction of the oil port 125.

[0050] In other examples, the first limiting portion 4111 may be a protrusion provided on the mounting structure 411, and the second limiting portion 126 may be a groove provided on the crankcase 12 and recessed in a direction away from the oil pan 11. During the assembly process of the oil strainer 41, at least a part of the mounting structure 411 is embedded in the oil port 125, and the first limiting portion 4111 is embedded in the second limiting portion 126 to limit the oil strainer 41 from moving relative to the crankcase 12 in the radial and circumferential directions of the oil port 125.

[0051] It should be noted that the present application does not specifically limit the structures and shapes of the first limiting portion 4111 and the second limiting portion 126.

[0052] As Figure 6 shown, as a realization manner, the support structure 112 includes a plurality of support bosses 1121. The support bosses 1121 are arranged around the circumference of the mounting structure 411. The heights of the plurality of support bosses 1121 are different, and the height of the support boss 1121 is determined by the distance between the bottom wall 113 and the crankcase 12. It should be noted that the present application does not specifically limit the number of the support bosses 1121.

[0053] Furthermore, the bottom wall 113 includes a first oil storage portion 1131 and a second oil storage portion 1132. Along the extending direction of the support structure 112, the longest distance between the first oil storage portion 1131 and the crankcase 12 is defined as the first length, and the longest distance between the second oil storage portion 1132 and the crankcase 12 is defined as the second length. The first length is greater than the second length, that is, the first oil storage portion 1131 is deeper than the second oil storage portion 1132. As a realization manner, the support bosses 1121 are respectively mounted on the first oil storage portion 1131 and the second oil storage portion 1132. By providing a plurality of support bosses 1121 with shorter lengths, the overall strength of the support structure 112 is improved to ensure the stable connection between the oil strainer 41 and the crankcase 12.

[0054] As Figure 7As shown, in some other examples, the support structure 112 includes a support boss 1121 that is circumferentially arranged around the mounting structure 411 and is substantially annular. A notch 1122 is formed on one side of the support boss 1121. The oil strainer 41 includes an oil strainer pipe 412 connected to the mounting structure 411. At least a part of the oil strainer pipe 412 is located in the area surrounded by the support boss 1121, and the oil strainer pipe 412 also extends toward the notch 1122 to the outside of the area surrounded by the support boss 1121. The oil strainer pipe 412 is avoided through the notch 1122 to prevent interference between the support structure 112 and the oil strainer pipe 412.

[0055] As Figure 8 shown, as an implementation, the lubrication system 40 further includes a pressure control component 43 and a lubricating oil path 42. The lubricating oil path 42 communicates with the oil storage space 111 through an oil port 125. The pressure control component 43 is installed in the crankcase 12 and communicates with the lubricating oil path 42. Specifically, the pressure control component 43 is installed on the lower crankcase 122 and fixedly connected to the lower crankcase 122. Under the action of the pressure control component 43, the lubricating oil stored in the oil storage space 111 is pumped into the lubricating oil path 42 through the oil port 125 to lubricate the components arranged in the engine 100, such as the cam mechanism, the transmission mechanism 30, the piston connecting rod mechanism, etc.

[0056] As Figure 9 shown, the lubricating oil path 42 includes a first oil path 421 and a second oil path 422. The first oil path 421 and the second oil path 422 are respectively connected to the input end and the output end of the pressure control component 43. One end of the first oil path 421 is connected to the input end of the pressure control component 43, and the other end of the first oil path 421 communicates with the oil storage space 111 through the oil port 125. The pressure control component 43 obtains the lubricating oil stored in the oil storage space 111 through the first oil path 421. One end of the second oil path 422 is connected to the output end of the pressure control component 43. The pressure control component 43 pumps the lubricating oil into each component to be lubricated in the engine 100 through the second oil path 422.

[0057] It should be noted that the second oil path 422 communicates with the crankcase 12, the cylinder block 13, and the cylinder head 14, and lubricates the components in the above structures through the second oil path, thereby forming a lubricating oil circulation in the engine 100.

[0058] As Figure 10As shown, the pressure control component 43 includes an oil pump 431 and a pressure limiting valve 432 connected to the oil pump 431. The function of the oil pump 431 is to raise the lubricating oil to a certain pressure and then forcibly pump it to the moving surfaces of various parts of the engine 100. The oil pump 431 includes a rotatable gear 4311 and an oil inlet chamber 4312 and an oil outlet chamber 4313 located on both sides of the gear 4311. The oil inlet chamber 4312 and the oil outlet chamber 4313 are distributed radially along the gear 4311. When the engine 100 is working, the gear 4311 of the oil pump 431 is rotated, and the lubricating oil is sent from the oil inlet chamber 4312 to the oil outlet chamber 4313 along the tooth gap 4314. In this way, a low pressure is formed at the oil inlet chamber 4312 to generate suction, sucking the lubricating oil in the oil storage space 111 into the oil inlet chamber 4312, and the lubricating oil is continuously pumped to the parts of the engine 100 that need it.

[0059] As Figure 11 and Figure 12 shown, the pressure limiting valve 432 is a device that controls the flow rate of the lubricating oil and limits the pressure of the lubricating oil. It can automatically adjust the pressure of the lubrication system 40 and protect it in case of overpressure or low pressure. Specifically, the pressure limiting valve 432 includes a valve body 4321, a valve core 4322, an elastic member 4323, and a first seal 4324. The valve body 4321 constitutes the basic framework of the pressure limiting valve 432. The valve body 4321 is formed with a hollow pressure regulating chamber 4325 around it, and a first mounting port 4321d is opened on the valve body 4321. The pressure regulating chamber 4325 is communicated with the outside of the valve body 4321 through the first mounting port.

[0060] The valve core 4322 is installed in the pressure regulating chamber 4325, and the valve core 4322 enters or exits the pressure regulating chamber 4325 through the first mounting port 4321d. Therefore, the radial length of the valve core 4322 is less than or equal to the radial length of the first mounting port 4321d. The valve core 4322 is in clearance fit with the valve body 4321, and the valve core 4322 can move relative to the valve body 4321 along the extending direction of the pressure regulating chamber 4325. The valve body 4321 further includes a first pressure limiting chamber 4326 and a second pressure limiting chamber 4327 communicated with the pressure regulating chamber 4325. One end of the first pressure limiting chamber 4326 facing away from the pressure regulating chamber 4325 is communicated with the first oil passage 421, and one end of the second pressure limiting chamber 4327 facing away from the pressure regulating chamber 4325 is communicated with the second oil passage 422. By adjusting the position of the valve core 4322 in the pressure regulating chamber 4325, the flow rate or flow velocity of the lubricating oil between the first pressure limiting chamber 4326 and the second pressure limiting chamber 4327 is controlled, so as to protect the lubrication system 40 in case of overpressure or low pressure.

[0061] The elastic member 4323 is installed in the pressure regulating chamber 4325, and the elastic member 4323 abuts against the valve core 4322 in the direction from the first installation port 4321d to the pressure regulating chamber 4325, and the oil pressure in the lubricating oil circuit 42 is balanced through the interaction between the elastic member 4323 and the valve core 4322. When the pressure in the first pressure limiting chamber 4326 increases, the valve core 4322 compresses the elastic member 4323 in the direction close to the first installation port 4321d, so that the gap between the first pressure limiting chamber 4326 and the second pressure limiting chamber 4327 increases, so that more lubricating oil enters the second oil circuit 422, thereby reducing the oil pressure in the oil storage space 111. When the pressure in the first pressure limiting chamber 4326 decreases, the elastic potential energy of the elastic member 4323 is converted into mechanical energy. The elastic member 4323 acts on the valve core 4322 and pushes the valve core 4322 to move away from the first mounting port 4321d, so that the gap between the first pressure limiting chamber 4326 and the second pressure limiting chamber 4327 is reduced, allowing less lubricating oil to enter the second oil circuit 422, thereby avoiding insufficient oil pressure in the oil storage space 111.

[0062] The first sealing member 4324 is installed in the pressure regulating chamber 4325 and is located at one end of the elastic member 4323 away from the valve core 4322 and abuts against the elastic member 4323. The side of the first sealing member 4324 away from the elastic member 4323 abuts against the valve body 4321 along the extension direction of the pressure regulating chamber 4325 and covers the first installation port 4321d, thereby preventing the elastic member 4323 and the valve core 4322 from being separated from the pressure regulating chamber 4325 from the first installation port 4321d, wherein the first sealing member 4324 is a gasket.

[0063] Through the above-mentioned arrangement, along the length direction of the valve body 4321, the valve core 4322, the elastic member 4323 and the first sealing member 4324 are sequentially installed in the pressure regulating chamber 4325, so that the valve core 4322 can move relative to the valve body 4321 under the action of pressure, thereby balancing the oil pressure in the lubrication system 40 and maintaining the stability of the lubrication system 40, and the first sealing member 4324 closes the first installation port 4321d, thereby improving the assembly efficiency of the pressure limiting valve 432 and the production cost of the engine 100.

[0064] It should be noted that in the prior art, the first mounting port 4321d is generally blocked by bolts. Since the engine generates vibrations when it is working, the vibrations cause the bolts and the valve body connection parts to move relative to each other and the friction to be gradually offset. In a vibrating environment, small relative movements will occur between the bolts and the valve body, and these movements will gradually offset the friction between them. Eventually, this repetitive movement will cause the bolts to loosen. The above-mentioned arrangement exerts a force on the first seal 4324 through the elastic member 4323, so that the first seal 4324 has a higher stability, and the risk of the first seal 4324 being detached due to the vibration of the engine 100 is relatively small.

[0065] A reference plane perpendicular to the extension direction of the pressure regulating chamber 4325 is defined, and the projection of the first sealing component 4324 along the extension direction of the pressure regulating chamber 4325 on the reference plane is defined as a first projection plane. The projection of the first mounting port 4321d along the extension direction of the pressure regulating chamber 4325 on the reference plane is defined as a second projection plane. The first projection plane basically covers the second projection plane, thereby preventing the first sealing component 4324 from falling off from the first mounting port 4321d.

[0066] Specifically, the valve body 4321 includes a valve tail 4321a (see Figure 10 ), the valve tail 4321a is located at one end of the valve body 4321 away from the first pressure limiting chamber 4326 and / or the second pressure limiting chamber 4327, and the valve tail 4321a is distributed along the circumference of the first installation opening 4321d. The valve tail 4321a is provided with a second installation opening 4321b through which the first sealing member 4324 can pass. The valve core 4322 and the elastic member 4323 enter the pressure regulating chamber 4325 along the first installation opening 4321d, and the elastic member 4323 is compressed to shorten the length of the elastic member 4323, so that the end of the elastic member 4323 close to the first installation opening 4321d avoids the second installation opening 4321b, and the first sealing member 4324 can enter the pressure regulating chamber 4325 through the second installation opening 4321b. When the first seal 4324 covers the first installation port 4321d, the elastic member 4323 returns to its natural state and abuts against the first seal 4324 to limit the movement of the first seal 4324 along the extension direction of the pressure regulating chamber 4325, thereby preventing the first seal 4324 from detaching from the pressure regulating chamber 4325 from the second installation port 4321b.

[0067] Furthermore, the valve tail 4321a includes a limiting portion 4321c, which limits the first sealing member 4324 in the radial direction of the first installation port 4321d. The limiting portion 4321c is located between the first installation port 4321d and the second installation port 4321b when viewed from the assembly direction of the first sealing member 4324. Therefore, when maintaining or replacing the first sealing member 4324, it is necessary to compress the elastic member 4323 along the extension direction of the pressure regulating chamber 4325 so that the first sealing member 4324 is separated from the limiting portion 4321c, and then the first sealing member 4324 can be taken out from the second installation port 4321b, thereby ensuring the stability of the first sealing member 4324.

[0068] Optionally, the limiting portion 4321c may be a groove 311 whose inner contour is substantially consistent with the outer contour of the first sealing member 4324 .

[0069] In some examples, the pressure limiting valve 432 further includes a second seal 4328. The second seal 4328 is embedded in the first mounting port 4321d and / or the second mounting port 4321b. By blocking the first mounting port 4321d and / or the second mounting port 4321b with the second seal 4328, the stability of the first seal 4324 is further improved, and the first seal 4324 is prevented from detaching from the first mounting port 4321d and / or the second mounting port 4321b.

[0070] In the examples of the present application, the first seal 4324 is made of a metal material, and the hardness of the first seal 4324 is greater than or equal to 50 HRC. This prevents the valve core 4322 from repeatedly pressing the first seal 4324 and causing deformation of the first seal 4324.

[0071] It should be understood that for those of ordinary skill in the art, improvements or changes can be made according to the above description, and all such improvements and changes should fall within the protection scope of the appended claims of the present application.

Claims

1. An engine, comprising: Oil pan; A crankcase, the crankcase is connected to the oil pan and forms an oil storage space for storing lubricating oil with the oil pan, and an oil passage opening communicating with the oil storage space is formed on a side of the crankcase facing the oil pan; A lubrication system, the lubrication system comprising a pressure control component and a lubrication oil circuit, the pressure control component being mounted on the crankcase and connected to the lubrication oil circuit, the pressure control component controlling the circulation of lubrication oil in the lubrication oil circuit, the pressure control component comprising an oil pump and a pressure limiting valve connected to the oil pump; It is characterized in that the pressure-limiting valve includes a valve body, a valve core, an elastic member and a first sealing member, the valve body is formed with a pressure regulating chamber, a first mounting port and a second mounting port, along the length direction of the valve body, the valve core, the elastic member and the first sealing member are sequentially installed in the pressure regulating chamber, the elastic member is arranged between the valve core and the first sealing member and respectively abuts against the valve core and the first sealing member; wherein, the valve core and the elastic member are installed in the pressure regulating chamber through the first mounting port, and the first sealing member is installed in the pressure regulating chamber through the second mounting port.

2. The engine according to claim 1, characterized in that A reference plane perpendicular to the extension direction of the pressure regulating chamber is defined, the projection of the first seal along the extension direction of the pressure regulating chamber on the reference plane is defined as a first projection plane, the projection of the first mounting port along the extension direction of the pressure regulating chamber on the reference plane is defined as a second projection plane, and the first projection plane basically covers the second projection plane.

3. The engine according to claim 1, characterized in that The valve body comprises a valve tail, the valve tail is arranged around the outer edge of the first installation port, and the second installation port is located at the valve tail.

4. The engine according to claim 3, characterized in that The valve tail includes a limiting portion for limiting the first sealing member in a direction perpendicular to the expansion and contraction direction of the elastic member. When viewed from the assembly direction of the first sealing member, the limiting portion is located between the first installation port and the second installation port.

5. The engine according to claim 1, characterized in that The valve body further comprises a first pressure limiting chamber and a second pressure limiting chamber communicated with the pressure regulating chamber, and the valve core moves along an extending direction of the pressure regulating chamber to increase or decrease a gap between the first pressure limiting chamber and the second pressure limiting chamber.

6. The engine according to claim 1, characterized in that The pressure limiting valve further includes a second sealing member embedded in the first installation opening and / or the second installation opening.

7. The engine according to claim 1, characterized in that The first sealing component is a metal gasket, and the hardness of the first sealing component is greater than 50HRC.

8. The engine according to claim 1, characterized in that The engine further includes a strainer, which is installed in the oil storage space and communicated with the oil passage port. The oil pan includes a bottom wall and a supporting structure, and the supporting structure extends from the bottom wall toward the crankcase. The strainer includes a mounting structure, and the strainer is connected to the crankcase via the mounting structure. At least a portion of the mounting structure is embedded in the oil passage port, and a side of the mounting structure facing away from the crankcase abuts against the supporting structure.

9. The engine according to claim 8, characterized in that The mounting structure includes a first limiting portion, and a second limiting portion cooperating with the first limiting portion is provided on a side of the crankcase facing the oil pan, and the first limiting portion and the second limiting portion are embedded with each other.

10. The engine according to claim 9, characterized in that The mounting structure includes two first limiting portions in a columnar shape, a preset gap is formed between the two first limiting portions, and when the filter is connected to the crankcase, the second limiting portion is located in the preset gap, and the two first limiting portions limit the second limiting portion along the width direction of the preset gap.

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