General-purpose gasoline engine

Abstract

The present application belongs to the technical field of power equipment, and particularly relates to a general gasoline engine; the general gasoline engine comprises a box body, a crankshaft cavity with an opening is arranged in the box body, a side cover is arranged on the side surface of the box body, a crankshaft mounting hole is arranged on the side cover, a bearing mounting cavity is arranged on the side cover at one side of the crankshaft mounting hole, a first mounting cavity is arranged on the side cover at the other side of the crankshaft mounting hole, the first mounting cavity and the crankshaft mounting hole are not on the same axis, an oil pumping mechanism is arranged in the first mounting cavity, the oil pumping assembly is connected to the crankshaft, an oil inlet hole is arranged in the side cover and extends downward from the first mounting cavity, an oil suction port is formed on one side of the lower part of the side cover, an oil discharge hole is also arranged in the side cover and extends upward from the first mounting cavity, and an oil injection port is arranged on one side surface of the upper part of the side cover and communicates with the oil discharge hole; the side cover of the general gasoline engine is improved, and the general gasoline engine with a simple structure, convenient post-maintenance and a smaller size is provided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power equipment, and particularly relates to a general gasoline engine. BACKGROUND

[0002] The gasoline engine is a kind of power machinery using gasoline as fuel, which is composed of a cylinder, a crank connecting rod mechanism, a gas distribution system, an oil supply system, a lubricating system and an ignition system. The general gasoline engine refers to a reciprocating piston type gasoline engine with wide application except for vehicle and aviation, generally with power less than 20 kW, and is mostly very versatile, and some are relatively professional, so it is also commonly called a small gasoline engine. The general gasoline engine is characterized by simple structure, easy operation and low cost, and is mainly used in agricultural and forestry plant protection machinery, garden machinery, small machines, generator sets, construction machinery, fire-fighting series machines, recreational go-karts, water power and aviation model power, etc. The crankcase is one of the main components of the gasoline engine, which is internally provided with moving parts such as a crankshaft and a connecting rod, and is composed of a crankcase cover and a crankcase body, the crankcase cover is cast according to the profile shape of the crankcase body and is processed to be a disc-shaped.

[0003] The gear pump provided on the side cover in the prior art is driven by a balance shaft, but in order to meet the demand for miniaturization of the general gasoline engine, the design of the balance shaft is cancelled in some models, so the lubricating system of the gear pump driven by the balance shaft on the side cover cannot be used, and therefore improvement design is needed. SUMMARY

[0004] In view of the deficiencies in the prior art, the side cover of the general gasoline engine is improved, and a general gasoline engine with simple structure, convenient post-maintenance and smaller size is provided.

[0005] The technical scheme of the present application is as follows:

[0006] The general gasoline engine comprises a box body, the box body is internally provided with an open crankcase, and the side surface of the box body is provided with a side cover, characterized in that: the side cover is provided with a crankshaft mounting hole, a bearing mounting cavity is arranged on the side cover at one side of the crankshaft mounting hole, a first mounting cavity is arranged on the side cover at the other side of the crankshaft mounting hole, the first mounting cavity and the crankshaft mounting hole are not on the same axis, a pump oil mechanism is arranged in the first mounting cavity, the pump oil assembly is connected to the crankshaft, an oil inlet channel extending downward from the first mounting cavity is arranged in the side cover, an oil suction port is formed on one side of the lower part of the side cover, an oil discharge channel extending upward from the first mounting cavity is further arranged in the side cover, an oil injection port in communication with the oil discharge channel is arranged on one side surface of the upper part of the side cover, and the bearing mounting cavity, the oil suction port and the oil injection port are arranged on the same side surface of the side cover.

[0007] Further, the upper end of the side cover is provided with a monitoring hole communicated with the oil discharging hole, a pressure sensor is connected in the monitoring hole, the pressure sensor is connected with a single-chip microcomputer, and the single-chip microcomputer is connected with the ignition coil.

[0008] Further, the oil pumping mechanism comprises an outer rotor fixed in the first mounting cavity and an inner rotor connected with the crankshaft and engaged with the outer rotor, the side cover is provided with a second mounting cavity higher than the first mounting cavity, the second mounting cavity is coaxial with the crankshaft mounting hole, a plurality of fixed connecting holes are uniformly arranged on the side cover surrounding the second mounting cavity, and an oil pump cover plate is arranged in the second mounting cavity, the oil pump cover plate is uniformly provided with connecting ears corresponding to the fixed connecting holes around the oil pump cover plate, the connecting ears are provided with connecting holes, and fasteners pass through the connecting holes and are connected with the fixed connecting holes.

[0009] Further, a labyrinth separation assembly is arranged on an outer surface of the tank perpendicular to the direction of the crankshaft cavity, a flow guide pipeline is arranged in the upper part of the tank of the crankshaft cavity, one end of the flow guide pipeline is communicated with the labyrinth separation assembly, an inlet communicated with the crankshaft cavity is arranged on the flow guide pipeline, and the tank is further provided with an oil return hole communicated with the crankshaft cavity and the labyrinth separation assembly.

[0010] Further, the labyrinth separation assembly comprises a first labyrinth assembly formed on the tank and a second labyrinth assembly fixed with the first labyrinth assembly through fasteners, and further comprises a separation diaphragm assembly arranged between the first labyrinth assembly and the second labyrinth assembly.

[0011] Further, the first labyrinth assembly comprises a first separator housing integrally formed with the tank, a first separation cavity communicated with the flow guide pipeline is arranged in the first separator housing, a second separation cavity is arranged in the left side of the first separator housing, a return flow cavity is arranged in the lower part of the first separation cavity and the second separation cavity, and the oil return hole is communicated with the return flow cavity.

[0012] Further, the second labyrinth assembly comprises a second separator housing, an exhaust port is arranged on the upper end of the second separator housing, a third separation cavity covering the first separation cavity and the second separation cavity is arranged in the second separator housing, a fourth separation cavity is arranged on the upper part of the third separation cavity, the fourth separation cavity is communicated with the exhaust port, and further comprising a second return flow cavity, the third separation cavity and the fourth separation cavity are both provided with guide grooves communicated with the second return flow cavity.

[0013] Further, a partition plate is arranged on the side wall of the second separation cavity away from the first separation cavity, the partition plate divides the second separation cavity into a C-shaped loop, the end of the partition plate close to the first separation cavity is higher than the other end, and the partition plate is parallel to the bottom surface of the second separation cavity.

[0014] Further, the inner wall of the box is provided with a partition plate for dividing the crank cavity of the box into upper and lower spaces, a communication notch is formed in the partition plate from one end close to the side cover to the other end, and an extension partition plate is arranged at one end of the communication notch away from the side cover, wherein the height of the extension partition plate is one third of the height of the communication notch.

[0015] Further, the side cover at the oil suction port is fixedly connected with an oil suction nozzle, and the length of the oil suction nozzle is greater than or equal to one third of the height of the communication notch.

[0016] In summary, the present application has the following advantages:

[0017] 1. The side cover of the general gasoline engine is improved, a first mounting cavity for mounting the oil pumping mechanism is processed on the outer surface of the side cover, and the first mounting cavity is not on the same axis as the crank mounting hole. First, the first mounting cavity is located on the outer surface of the side plate, and the user can maintain the oil pumping mechanism externally. In the prior art, the oil pumping mechanism is located on the inner side of the side cover, and after assembly, it is located inside the box. Maintenance requires the side cover to be removed, which is not convenient for later maintenance. Second, the oil pumping mechanism of the present application is directly driven by the crankshaft, which simplifies the driving mode of the oil pumping mechanism and provides the possibility of canceling the balance shaft. After canceling the balance shaft, the volume of the general gasoline engine can be further reduced to meet the demand for miniaturization of equipment.

[0018] 2. The monitoring hole and the pressure sensor are added to the oil discharge channel, the oil pressure pumped by the oil pumping mechanism is detected, and the detected pressure is fed back to the single-chip microcomputer controlling the ignition coil. The oil pumping assembly is directly connected with the crankshaft, and the oil pumping pressure has a positive correlation with the rotational speed of the crankshaft. In some harsh working conditions, such as high rotational speed of the crankshaft but pressure close to zero feedback by the pressure sensor, the single-chip microcomputer can control the ignition coil to protect the equipment, avoid long-time operation of the equipment under insufficient oil lubrication, and prolong the service life of the equipment.

[0019] 3. The position of the labyrinth separation assembly on the box is changed by improving the box, the labyrinth separation assembly is located on the outer wall of the right end of the box, which has a large design space, and overcomes the small design space and the influence on the length of the equipment along the crankshaft direction of the oil-gas separator located beside the crankshaft hole in the prior art, which can further ensure the reliability of oil-gas separation of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a perspective view of the general gasoline engine of the present application;

[0021] Figure 2 is a perspective view of the side cover;

[0022] Figure 3is a front view of the side cover;

[0023] Figure 4 is a sectional view of A-A of Figure 3

[0024] Figure 5 is a perspective view of the side cover with outer rotor and inner rotor and pressure sensor;

[0025] Figure 6 is a perspective view of the tank of the universal gasoline engine of the present application;

[0026] Figure 7 is a perspective view of the tank of the universal gasoline engine of the present application from another angle;

[0027] Figure 8 is a front view of the tank of the universal gasoline engine of the present application;

[0028] Figure 9 is a sectional view of B-B of Figure 8

[0029] Figure 10 is a perspective view of the tank of the universal gasoline engine of the present application (without the second labyrinth assembly);

[0030] Figure 11 is a perspective view of the second labyrinth assembly;

[0031] Figure 12 is a perspective sectional view of the lower part of the universal gasoline engine of the present application;

[0032] Figure 13 is a connection diagram of the pressure sensor, single-chip microcomputer and ignition coil;

[0033] Fig. 1 is a tank, 10 is a crankshaft cavity, 12 is a flow guide pipeline, 120 is an inlet, 121 is an oil return hole, 13 is a partition plate, 130 is an extended partition plate,

[0034] 2 is a side cover, 20 is a crankshaft mounting hole, 201 is a bearing mounting cavity, 21 is a first mounting cavity, 22 is an oil inlet channel, 220 is an oil suction port, 23 is an oil discharge channel, 230 is an oil injection port, 231 is a monitoring hole, 232 is a pressure sensor, 233 is a single-chip microcomputer, 234 is an ignition coil, 24 is a pump mechanism, 240 is an outer rotor, 241 is an inner rotor, 25 is a second mounting cavity, 250 is a fixed connection hole, 26 is an oil pump cover plate, 260 is a connection lug, 2601 is a connection hole, 2201 is an oil suction nozzle,

[0035] 3 is a labyrinth separation assembly,

[0036] ​​30 is a first labyrinth assembly, 301 is a first separator housing, 302 is a first separation cavity, 303 is a second separation cavity, 3030 is a partition, 304 is a return flow cavity,

[0037] 31 is a second labyrinth assembly, 310 is a second separator housing, 311 is an exhaust port, 312 is a third separation cavity, 313 is a fourth separation cavity, 315 is a second return flow cavity, 316 is a guide slot. DETAILED DESCRIPTION

[0038] The present application will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present application and implement it.

[0039] It should be noted that when an element is referred to as being "disposed on", "fixed on" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "fixed on" or "fixedly connected" to another element, it can be either detachably fixed to the other element or non-detachably fixed to the other element. When an element is referred to as being "connected" or "rotatably connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", "upper", "lower", and similar expressions used herein are used for the purpose of illustration only and are not intended to be limiting.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing specific embodiments only and is not intended to be limiting. As used in this description, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0041] The terms "first", "second", "third", and so on, used in the present application are not intended to represent a specific number and order, but are merely used for distinguishing names.

[0042] Figure 1 The first direction in the general gasoline engine is the length direction of the general gasoline engine, the second direction is the width direction of the general gasoline engine, and the third direction is the height direction of the general gasoline engine.

[0043] In combination Figures 1 to 13The utility gasoline engine includes a box body 1, and other components such as an oil tank and an air filter are common components and are not shown in the drawings. The box body 1 is provided with an open crank cavity 10, and the side of the box body 1 is provided with a side cover 2 for sealing the opening of the crank cavity. The side cover is fixedly connected with the box body through fasteners. The side cover 2 is provided with a crank mounting hole 20, a bearing mounting cavity 201 is arranged on one side of the side cover of the crank mounting hole 20, a bearing is arranged in the bearing mounting cavity, and the bearing is sleeved on the crank to support the crank. A first mounting cavity 21 is arranged on the other side of the side cover of the crank mounting hole 20, the first mounting cavity 21 and the crank mounting hole 20 are not on the same axis, and a pump oil mechanism 24 is arranged in the first mounting cavity 21. Specifically, the pump oil mechanism is a gear pump, which includes an outer rotor and an inner rotor. The outer ring of the outer rotor is fixedly connected in the first mounting cavity, and the inner rotor is provided with a connecting hole. The pump oil assembly is connected to the crank, specifically, the connecting hole of the inner rotor is sleeved on the crank, and the inner rotor rotates with the crank. The involute gear pump is used to increase the flow, so that the pump oil mechanism can meet the lubrication requirement. An oil inlet channel 22 extending downward from the first mounting cavity is arranged in the side cover 2, and an oil suction port 220 is formed on one side of the lower part of the side cover. An oil discharge channel 23 extending upward from the first mounting cavity is further arranged in the side cover 2. An oil injection port 230 in communication with the oil discharge channel is arranged on one side of the upper part of the side cover. The bearing mounting cavity, the oil suction port and the oil injection port are arranged on the same side of the side cover. The side cover of the utility gasoline engine is improved, and the first mounting cavity for mounting the pump oil mechanism is processed on the outer surface of the side cover. The pump oil mechanism is located on the outer surface of the side cover. First, the first mounting cavity is located on the outer surface of the side cover, so that the user can maintain the pump oil mechanism from the outside. In the prior art, the pump oil mechanism is located on the inner side of the side cover, and after assembly, it is located in the box body. The side cover needs to be removed for maintenance, which is not convenient for later maintenance. Secondly, the pump oil mechanism of the utility gasoline engine is directly driven by the crank, which simplifies the driving mode of the pump oil mechanism and provides the possibility of canceling the balance shaft. After canceling the balance shaft, the size of the utility gasoline engine can be further reduced to meet the demand for miniaturization of equipment.

[0044] In order to detect the operation of the device, the upper end of the side cover 2 is provided with a monitoring hole 231 communicated with the oil discharge channel, a pressure sensor 232 is connected in the monitoring hole 231, the pressure sensor 232 is connected with a single-chip microcomputer 233, and the single-chip microcomputer 233 is connected with an ignition coil 234. We monitor the working condition of the oil pumping mechanism through the pressure sensor. If the oil pumping mechanism is in a normal and stable working state, the value detected by the pressure sensor is in a stable state, the single-chip microcomputer controls the ignition coil to normally and stably ignite, and the device is in a normal working state. In some special cases, if the pressure value of the oil pumping mechanism is too high, there may be a problem that the oil injection port is blocked, and the single-chip microcomputer may need to control the ignition coil not to ignite, so as to avoid the device in a long-time working state without lubrication. For example, if the crankshaft speed is very high but the pressure feedback by the pressure sensor is close to zero, the single-chip microcomputer judges that the device is in a state of insufficient lubrication, and then controls the state of the device by controlling the ignition coil not to ignite, so as to avoid the device running for a long time in the case of insufficient lubrication of the oil, thereby prolonging the service life of the device.

[0045] Here, the specific structure of the oil pumping mechanism is further described. The oil pumping mechanism 24 includes an outer rotor 240 fixed in the first mounting cavity 21, and an inner rotor 241 connected to the crankshaft and engaged with the outer rotor. The side cover 2 is provided with a second mounting cavity 25 higher than the first mounting cavity, and the second mounting cavity 25 is on the same axis as the crankshaft mounting hole 201. A plurality of fixed connection holes 250 are uniformly distributed around the side cover of the second mounting cavity. The oil pump cover plate 26 is installed in the second mounting cavity 25, and the oil pump cover plate 26 is uniformly distributed around the four corners. The connecting ears 260 correspond to the fixed connection holes. The connecting holes 2601 are provided on the connecting ears, and the fastening members pass through the connecting holes and are connected with the fixed connection holes. Here, the specific structure of the oil pumping mechanism is limited. The oil pumping mechanism is a involute gear pump. The inner rotor is provided with a connecting hole. The inner rotor is sleeved on the crankshaft and rotates with the crankshaft. No additional driving mechanism is needed to drive the gear pump. The situation that the gear pump cannot be driven after the balance shaft is cancelled in the general gasoline engine is avoided. The balance shaft is cancelled. The designer can further optimize the size of the tank of the general gasoline engine to meet the demand of miniaturization of the device. Further, the oil pump cover plate is used to axially limit and fix the outer rotor and the inner rotor. The oil pump cover plate is located on the outside of the side cover. The oil pump cover plate can be removed to maintain the oil pumping mechanism. It is convenient for people to maintain the oil pumping mechanism. The gear pump in the prior art is located on the inside of the side cover and in the tank. When the gear pump is maintained, the entire side cover needs to be removed. The disassembly and assembly process is relatively complicated. The crankshaft is also affected during the disassembly and assembly process. High technical requirements are needed for the disassembly and assembly process.

[0046] Further, the universal gasoline engine of the present application is provided with a labyrinth separation assembly 3 on the outer surface of the box 1 perpendicular to the direction of the crank cavity, and a flow guide pipe 12 is arranged in the upper part of the box 1 of the crank cavity, specifically: a long strip-shaped processable area is formed at the connection between the side surface and the upper end of the crank cavity when the interior of the box is cast, and then the flow guide pipe is formed by drilling and processing, one end of the flow guide pipe 12 is communicated with the labyrinth separation assembly 3, the flow guide pipe 12 is provided with an inlet 120 communicated with the crank cavity, and the box 1 is further provided with an oil return hole 121 communicated with the crank cavity and the labyrinth separation assembly; the oil-gas mixture generated during the operation of the universal gasoline engine enters the flow guide pipe through the inlet, and then flows out from the flow guide pipe into the labyrinth separation assembly, the position of the labyrinth separation assembly on the box is changed by improving the box, the labyrinth separation assembly is located on the outer wall of the right end of the box, has a large design space, and overcomes the small design space and the influence on the length of the equipment along the crank direction of the oil-gas separator located beside the crank hole in the prior art, and the reliability of oil-gas separation of the equipment can be further ensured.

[0047] The specific structure of the labyrinth separation assembly will be described below, the labyrinth separation assembly 3 includes a first labyrinth assembly 30 formed on the box, a second labyrinth assembly 31 fixed to the first labyrinth assembly through fasteners, and a separation diaphragm assembly arranged between the first labyrinth assembly and the second labyrinth assembly; the separation diaphragm assembly is not shown in the figure and is clamped and fixed between the first labyrinth assembly and the second labyrinth assembly, and the separation diaphragm assembly is used to control the direction of movement of the oil-gas mixture flow in the labyrinth separation assembly, the labyrinth separation assembly adopts a sandwich structure, the structural assembly is independent, processing is facilitated, processing cost is reduced, meanwhile, people are facilitated to assemble, and the efficiency of assembly is improved.

[0048] Further, the first labyrinth assembly 30 includes a first separator housing 301 integrally formed with the box, a first separation cavity 302 communicated with the flow guide pipe is arranged in the first separator housing 301, a second separation cavity 303 is arranged in the first separator housing on the left side of the first separation cavity 302, a backflow cavity 304 is arranged in the first separator housing below the first separation cavity and the second separation cavity, and the oil return hole is communicated with the backflow cavity; the structure of the backflow cavity is limited here, the backflow cavity 304 includes a first plane and a second plane arranged in a V shape, the oil return hole is arranged on the box at the included angle between the first plane and the second plane, after the first plane and the second plane are arranged at the included angle of the V shape, the oil liquid entering the backflow cavity will all converge at the included angle between the two planes and flow back to the crank cavity of the box from the backflow cavity.

[0049] Further, the second labyrinth assembly 31 comprises a second separator housing 310, the upper end of the second separator housing 310 is provided with an exhaust port 311, the second separator housing 310 is provided with a third separation chamber 312 covering the first separation chamber and the second separation chamber, the upper part of the third separation chamber 312 is provided with a fourth separation chamber 313, the fourth separation chamber 313 is communicated with the exhaust port, further comprising a second backflow chamber 315, the third separation chamber and the fourth separation chamber are provided with guide grooves 316 communicated with the second backflow chamber; here, the structure of the labyrinth separation assembly is limited, the oil-gas mixture enters the first separation chamber of the first labyrinth assembly from the flow guide pipe, then passes through the separation diaphragm assembly to enter the third separation chamber of the second labyrinth assembly, after moving in the third separation chamber, it enters the second separation chamber of the first labyrinth assembly through the separation diaphragm assembly, after separation in the second separation chamber, it enters the fourth separation chamber of the second labyrinth assembly through the separation diaphragm assembly, and the gas is finally discharged from the exhaust port of the labyrinth separation assembly, the separated lubricating oil is collected to the second backflow chamber through the guide grooves, the lubricating oil in the second backflow chamber is collected to the backflow chamber through the through holes in the separation diaphragm assembly, and finally flows into the crankcase cavity of the box through the backflow hole.

[0050] In order to improve the separation effect of the labyrinth separation assembly, a baffle 3030 is arranged on the side wall of the second separation chamber 303 away from the first separation chamber, the baffle divides the second separation chamber into a C-shaped loop, and the end of the baffle close to the first separation chamber is higher than the other end, and the baffle is parallel to the bottom surface of the second separation chamber; by arranging the baffle, the running stroke of the oil-gas mixture in the second separation chamber is increased, so that the separation effect is improved, and the baffle is arranged obliquely, which is beneficial to the collection and collection of oil, and avoids that the oil stays in the separation chamber for a long time.

[0051] In order to guarantee the lubricating effect of the application, the inner wall of the box 1 is provided with a partition plate 13 which divides the crank cavity of the box into two spaces, the partition plate 13 is provided with a communication notch from one end close to the side cover to the other end, and the other end of the communication notch away from the side cover is provided with an extension partition plate 130, the height of the extension partition plate is one third of the height of the communication notch; the box of the gasoline engine is divided into two chambers by the partition plate, two chambers are formed in the crank cavity of the box, under normal working conditions, the oil mainly locates in the chamber below the partition plate, the oil is sucked by the oil pumping mechanism and is sprayed from the oil injection port to lubricate the equipment, under some severe working conditions, the general gasoline engine can be inclined at a large angle, after the equipment is inclined, the oil can flow to the inclined side, and the oil in the oil suction port cannot be sucked, therefore, the partition plate is arranged, the partition plate can always keep a part of the oil below the partition plate, so that the oil pumping mechanism can still suck the oil under the inclined state of the equipment, the normal lubrication of the equipment is guaranteed, and the extension partition plate is further arranged, the extension partition plate further limits the amount of oil flowing from below the partition plate to above, so that the amount of oil below the partition plate is guaranteed, the height of the oil page after the equipment is inclined is guaranteed, and the demand of the lubricating system for sucking the oil is met.

[0052] The side cover at the oil suction port 220 is fixedly connected with an oil suction nozzle 2201, the length of the oil suction nozzle is greater than or equal to one third of the height of the communication notch, the front end of the oil suction nozzle is always in the state of being immersed in the oil by arranging the oil suction nozzle and limiting the length of the oil suction nozzle, the oil can be sucked, so that the lubricating effect is guaranteed, the problem of insufficient lubrication of the equipment under the inclined state is avoided, and the use demand of the equipment under severe working conditions is met.

[0053] Further, the end of the partition plate away from the side cover is higher than the side of the partition plate close to the side cover, the partition plate is designed in an arc shape in the length direction of the gasoline engine, so that the oil flows from both ends to the middle, the backflow oil drops on the partition plate can quickly flow into the box below the partition plate, further, the side of the surface of the partition plate close to the side cover is also lower than the side away from the side cover, so that the oil can flow to the side close to the side cover in the oil flow process, and the problem that the oil is blocked by the extension partition plate and cannot flow is avoided.

[0054] In summary, the application has the following beneficial effects:

[0055] 1. The side cover of the general gasoline engine is improved, a first mounting cavity for mounting the oil pumping mechanism is processed on the outer surface of the side cover, and the first mounting cavity is not on the same axis as the crankshaft mounting hole, first, the first mounting cavity is located on the outer surface of the side plate, the user can maintain the oil pumping mechanism externally, and the oil pumping mechanism in the prior art is located on the inner side of the side cover, after assembly, it is located inside the box body, and maintenance needs to disassemble the side cover, which is not convenient for later maintenance, secondly, the oil pumping mechanism of the present application is directly driven by the crankshaft, which simplifies the driving mode of the oil pumping mechanism and provides the possibility of canceling the balance shaft, after canceling the balance shaft, the volume of the general gasoline engine can be further reduced to meet the demand for miniaturization of equipment.

[0056] 2. The application adds a monitoring hole and a pressure sensor to the oil discharge hole, detects the oil pressure pumped by the oil pumping mechanism, and feeds back the detected pressure to the single-chip microcomputer controlling the ignition coil, the oil pumping assembly is directly connected with the crankshaft, and the oil pumping pressure has a positive correlation with the rotating speed of the crankshaft, in some harsh working conditions, such as high rotating speed of the crankshaft but pressure close to zero feedback by the pressure sensor, the single-chip microcomputer can control the ignition coil to protect the equipment, avoid long-time operation of the equipment under the condition of insufficient oil lubrication, and prolong the service life of the equipment,

[0057] 3. The application improves the box body, changes the position of the labyrinth separation assembly on the box body, and the labyrinth separation assembly is located on the outer wall of the right end of the box body, which has a large design space, and overcomes the design space and the influence on the length of the equipment along the crankshaft direction of the oil-gas separator beside the crankshaft hole in the prior art, which can further ensure the reliability of the oil-gas separation of the equipment.

[0058] Based on the described embodiments of the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the application.

Claims

1. A general-purpose gasoline engine comprising a case in which an open crankcase is provided, and a side cover is provided on a side surface of the case, characterized in that: The side cover is provided with a crankshaft mounting hole, a bearing mounting cavity is arranged on one side of the side cover, a first mounting cavity is arranged on the other side of the side cover, the first mounting cavity and the crankshaft mounting hole are not on the same axis, a pump oil mechanism is arranged in the first mounting cavity, the pump oil assembly is connected to the crankshaft, an oil inlet channel extending downward from the first mounting cavity is arranged in the side cover, an oil suction port is formed on one side of the lower part of the side cover, an oil discharge channel extending upward from the first mounting cavity is further arranged in the side cover, an oil injection port is arranged on one side of the upper part of the side cover and communicates with the oil discharge channel, the bearing mounting cavity, the oil suction port and the oil injection port are arranged on the same side of the side cover, The upper end of the side cover is provided with a monitoring hole communicating with the oil discharge channel, a pressure sensor is connected in the monitoring hole, the pressure sensor is connected with a single-chip microcomputer, and the single-chip microcomputer is connected with an ignition coil, A labyrinth separation assembly is arranged on an outer surface of the box perpendicular to the direction of the crankshaft cavity, a flow guide pipeline is arranged in the upper part of the box, one end of the flow guide pipeline communicates with the labyrinth separation assembly, an inlet communicating with the crankshaft cavity is arranged on the flow guide pipeline, and an oil return hole communicating the crankshaft cavity and the labyrinth separation assembly is further arranged on the box, The labyrinth separation assembly comprises a first labyrinth assembly formed on the box, a second labyrinth assembly fixed to the first labyrinth assembly by fasteners, and a separation diaphragm assembly arranged between the first labyrinth assembly and the second labyrinth assembly, The first labyrinth assembly comprises a first separator housing integrally formed with the box, a first separation cavity communicating with the flow guide pipeline is arranged in the first separator housing, a second separation cavity is arranged in the left side of the first separator housing, a return flow cavity is arranged in the lower part of the first separator housing, and the oil return hole communicates with the return flow cavity, The second labyrinth assembly comprises a second separator housing, an exhaust port is arranged at the upper end of the second separator housing, a third separation cavity covering the first separation cavity and the second separation cavity is arranged in the second separator housing, a fourth separation cavity is arranged at the upper part of the third separation cavity, the fourth separation cavity communicates with the exhaust port, and a second return flow cavity is further arranged, and the third separation cavity and the fourth separation cavity are both provided with guide grooves communicating with the second return flow cavity.

2. The universal gasoline engine according to claim 1, characterized by: The pump oil mechanism comprises an outer rotor fixed in the first mounting cavity and an inner rotor connected to the crankshaft and engaged with the outer rotor, a second mounting cavity higher than the first mounting cavity is arranged on the side cover, the second mounting cavity is on the same axis as the crankshaft mounting hole, a plurality of fixed connection holes are uniformly arranged around the second mounting cavity, an oil pump cover plate is arranged in the second mounting cavity, connection ears corresponding to the fixed connection holes are uniformly arranged around the oil pump cover plate, connection holes are arranged on the connection ears, and the fasteners pass through the connection holes and are connected with the fixed connection holes.

3. The universal gasoline engine according to claim 1, characterized in that: A partition plate is arranged on the side wall of the second separation cavity away from the first separation cavity, the partition plate divides the second separation cavity into a C-shaped loop, and the end of the partition plate close to the first separation cavity is higher than the other end, and the partition plate is parallel to the bottom surface of the second separation cavity.

4. The universal gasoline engine according to claim 1, characterized by: The inner wall of the box is provided with a partition plate for dividing the crank cavity of the box into two spaces, a communication notch is formed in the partition plate from one end close to the side cover to the other end, and an extension partition plate is arranged in the communication notch away from the side cover.

5. The universal gasoline engine according to claim 4, characterized in that: A side cover at the oil suction port is fixedly connected with an oil suction nozzle, and the length of the oil suction nozzle is greater than or equal to one third of the height of the communication notch.

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