Universal engine

Abstract

The utility model discloses a general engine which comprises a crankcase mainly composed of a crankcase body and a crankcase cover, the crankcase body is connected with an air cylinder, a crankshaft and a cam shaft are arranged in the crankcase body, an engine oil filter and a cooling fan are arranged on the outer side of the crankcase body, an oil inlet channel and an oil outlet channel are arranged on the crankcase wall of the crankcase body, and the oil inlet channel and the oil outlet channel are communicated with each other. The cooling fan, the engine oil filter, the oil outlet channel, the oil inlet channel and the engine oil pump are arranged on the side, away from the box cover, of the box body in a centralized mode. And the oil pump is in transmission connection with the cam shaft. According to the scheme, the problems that a general engine is difficult to realize volume miniaturization and good lubricating effect are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to general engine. BACKGROUND

[0002] General engine refers to a widely used engine type, which can be used for various devices and machines, including ships, generator sets, agricultural machinery, etc. General engine has a wide range of applications and strong adaptability, which can meet the needs of different fields. When general engine is working, oil is used to lubricate each friction part of the crankcase to ensure its service life. The friction surface exposed in the crankcase is generally lubricated by splashing, such as the friction surface between various gears; and the hidden friction surface is lubricated by pressure, such as the friction surface between the crankshaft and the corresponding mounting hole on the crankcase. The structure of general engine generally includes a crankcase composed of a box body and a cover, a cylinder connected to the crankcase, a piston arranged in the cylinder, a crankshaft and a camshaft arranged in the crankcase, a connecting rod connected between the crankshaft and the piston, a gear transmission mechanism connected between the crankshaft and the camshaft, an oil inlet and outlet channel and an oil pump arranged on the wall of the crankcase for conveying oil, an oil filter connected to the oil inlet and outlet channel on the outside of the crankcase for filtering oil, the oil inlet channel sucking oil from the bottom of the crankcase and conveying it to the oil filter under the action of the oil pump, the filtered oil being conveyed to each pressure lubricated friction surface through the oil outlet channel, and a cooling fan connected to the crankshaft outside the box body of the crankcase. In the prior art, the box body of the crankcase is an integral component and constitutes most of the structure of the crankcase, the end of the box body is provided with an assembly opening for assembling the crankshaft, camshaft and other components into the crankcase, and the cover is connected to the assembly opening for sealing the assembly opening and supporting part of the components in the crankcase. In the prior art, the oil filter of the general engine and the oil inlet channel for sucking oil from the bottom of the crankcase are generally arranged on the cover, and the oil pump is also arranged on the cover of the crankcase, the oil pump being drivingly connected to the crankshaft through the gear transmission mechanism, so that the crankshaft drives the oil pump to work. In the prior art, the oil filter is arranged on one side of the cover of the crankcase, which easily leads to a larger size of the general engine in the direction parallel to the axial direction of the crankshaft, making the general engine have higher requirements for the installation space and easily leading to insufficient installation compatibility of the general engine.

[0003] Chinese patent document CN101749078A discloses a lubricating oil cooling structure of an engine, including a cooling fan provided at one end side of a crankshaft rotatably supported in a crankcase, and a blower housing provided at the one end side of the crankshaft to cover the cooling fan. The lubricating oil cooling structure guides cooling air generated by the cooling fan rotating integrally with the crankshaft to a cylinder block using the blower housing. A cooling device is installed on a cooling device mounting surface of the crankcase, and the cooling device is capable of fitting an oil filter. First and second passages are formed in the crankcase, and lubricating oil flows through the first and second passages. The first and second passages open on the cooling device mounting surface. The cooling device has a cylindrical portion having a mounting portion for mounting the cooling device on the crankcase, a fitting portion capable of fitting the oil filter, and a cooling portion integrally formed with the cylindrical portion and protruding in a radial direction from the cylindrical portion. The cooling portion cools lubricating oil flowing through the cooling portion, which is discharged from or introduced into the oil filter, using cooling air. First and second openings are formed in the cylindrical portion, and the first opening communicates with the first passage, and the second opening is separated from the first opening and communicates with the second passage. An opening communicating with the first passage and an opening communicating with the oil filter are formed in the cooling portion, and an introduction passage for introducing lubricating oil from the cylindrical portion is provided between the two openings. The cooling portion is disposed in the blower housing, and lubricating oil flowing through the introduction passage is cooled using cooling air generated by the cooling fan. A drive gear is provided on the crankshaft, and the drive gear engages with a driven gear provided on a pump drive shaft. Therefore, if the crankshaft rotates, the drive shaft rotates via the drive gear and the driven gear. An oil pump is provided on the pump drive shaft, and the oil pump sucks and discharges lubricating oil filled in an oil pan by rotation of the pump drive shaft.

[0004] In the technical solution disclosed in CN101749078A, the oil filter is arranged on the side of the crankcase connected to the cylinder, so that the size of the general-purpose engine in the direction parallel to the crankshaft axis is reduced. In the prior art, the cooling of the lubricating oil is achieved by arranging a cooling device having a cooling portion between the oil filter and the crankcase. The cooling portion has an oil introduction passage, and the cooling of the lubricating oil flowing through the introduction passage is achieved by cooling the cooling portion using a cooling fan. The driving of the oil pump is achieved by arranging a gear transmission mechanism between the crankshaft and the pump drive shaft. In order to facilitate the assembly of the oil pump and the gear transmission mechanism driving the oil pump, the oil pump is generally arranged on the side of the cover of the crankcase. In this way, when the lubricating effect of the general-purpose engine is improved, the structure becomes more complex, and miniaturization is difficult to achieve. Utility model content

[0005] The utility model discloses a small and good general engine of lubrication effect.

[0006] Under the special requirements of some terminal products using general engine, the oil filter cannot be arranged at the end of the crankcase body close to the cover under the premise of not changing the original installation space of the general engine as far as possible. In this way, after adjusting the position of the oil filter, the oil needs to flow through the cover, the oil pump and the body in sequence before entering the oil filter. After such adjustment, it is found that the wear degree of the friction surface using pressure lubrication arranged at the side of the crankcase body away from the cover increases obviously, resulting in the significant increase of the maintenance frequency of the general engine. If the position of the oil pump is adjusted so that the oil pump is arranged as close to the oil filter as possible without being arranged on the cover, a gear set for driving the oil pump by the crankshaft needs to be arranged on the crankcase separately, which leads to the increase of the volume of the crankcase and the installation space of the whole machine, so that the improved general engine cannot meet the requirements of the original installation space. Therefore, the two aspects of the small and good general engine of lubrication effect are difficult to be considered.

[0007] In order to achieve the above-mentioned purpose, the basic scheme of the utility model provides a general engine, which comprises a crankcase mainly composed of a body and a cover, the body is connected with a cylinder, a crankshaft and a camshaft are arranged in the crankcase, an oil filter and a cooling fan are arranged on the outside of the crankcase, an oil inlet and an oil outlet are arranged on the wall of the crankcase, an oil pump is arranged on the oil inlet, the cooling fan, the oil filter, the oil outlet, the oil inlet and the oil pump are arranged on the side of the body away from the cover; the oil pump is in transmission connection with the camshaft.

[0008] The beneficial effects of the basic scheme are as follows: the cooling fan is arranged on the side of the body away from the cover, the oil inlet, the oil outlet and the oil pump are arranged on the end of the body away from the cover, and the camshaft directly drives the oil pump to work, so that the length of the oil inlet and the oil outlet is greatly shortened, the oil pressure loss is reduced, the oil in the oil inlet, the oil outlet and the oil pump arranged on the body can be cooled in time by the cooling fan, so that the lubrication effect of the oil on the friction surface using pressure lubrication on the side of the body away from the cover is improved; at the same time, the oil pump is driven by the original camshaft in the crankcase, without the need of arranging a gear transmission mechanism between the crankshaft and the oil pump, so that the problem of the significant increase of the installation space of the general engine caused by the significant increase of the volume of the crankcase is avoided, and the effect of the small and good general engine of lubrication effect is realized.

[0009] Preferably, the oil filter is located below the cylinder. With such an arrangement, the installation position of the oil filter is a full use of the narrow space between the cylinder and the crankcase, thereby further reducing the installation space of the general-purpose engine, and facilitating the improvement of the installation compatibility.

[0010] Preferably, the oil inlet and the oil outlet are located inside the wall of the case body facing the cooling fan. With such an arrangement, the oil in the oil inlet and the oil outlet is better cooled, thereby further improving the lubrication effect.

[0011] Preferably, the oil pump is directly connected to the camshaft. With such an arrangement, it is beneficial to further simplify the structure, thereby making the general-purpose engine more compact and improving the installation compatibility.

[0012] Preferably, the oil pump is directly connected to the end of the camshaft. With such an arrangement, it is beneficial to further simplify the structure, thereby making the general-purpose engine more compact and improving the installation compatibility.

[0013] Preferably, the case body is provided with a pump mounting cavity for mounting the oil pump. With such an arrangement, the oil pump is directly supported by the case body, and the oil pump is as far as possible from the middle of the camshaft, which is beneficial to fully utilize the space of the case body, and the heat of the oil in the oil pump can be quickly transferred to the side of the case body close to the cooling fan for rapid cooling, which is beneficial to further improve the oil lubrication effect, and avoids the problem of increasing the volume of the crankcase and affecting the installation compatibility of the general-purpose engine.

[0014] Preferably, the side of the case body opposite to the case cover is provided with a pump assembly hole communicating with the pump mounting cavity, and a sealing cover is detachably connected to the case body in sealing cooperation with the pump assembly hole. With such an arrangement, the installation and maintenance of the oil pump can be realized only through the pump assembly hole, without the need to disassemble the camshaft and the case cover, thereby greatly reducing the maintenance difficulty of the oil pump.

[0015] Preferably, the side of the case body facing the middle of the camshaft is provided with a support hole for supporting the camshaft, and the support hole is a stepped hole, and the small-diameter end of the support hole faces the pump mounting cavity. With such an arrangement, the camshaft can be prevented from moving towards the oil pump and pressing the oil pump, thereby facilitating the reduction of wear between the oil pump and the case body, and further reducing the pressure loss of the oil pump, which is beneficial to further improve the lubrication effect.

[0016] Preferably, the box is provided with a mounting hole matched with the rotation of the crankshaft, and an oil groove is arranged on the inner wall of the mounting hole and communicated with the oil outlet. By adopting the arrangement, the box directly supports the crankshaft through the mounting hole, and the crankshaft is lubricated by pumping the oil into the oil groove through the oil outlet, so that the bearing or other components are not required between the crankshaft and the box, thereby simplifying the structure of the engine and ensuring the lubrication effect between the crankshaft and the box.

[0017] Preferably, the oil inlet extends to the bottom of the box in an inclined manner. By adopting the arrangement, the angle adaptability of the general engine is improved.

[0018] Preferably, the oil inlet is connected with an oil coarse filter at one end of the bottom of the box.

[0019] The utility model has the following beneficial effects:

[0020] Compared with the prior art, the utility model sets the cooling fan on the side of the box opposite to the box cover, sets the oil inlet, the oil outlet and the oil pump on the end of the box away from the box cover, and directly drives the oil pump by the camshaft, so that the length of the oil inlet and the oil outlet is greatly shortened, the oil pressure loss is reduced, the cooling fan can cool the oil in the oil inlet, the oil outlet and the oil pump on the box, thereby improving the lubrication effect of the oil on the friction surface of the box away from the box, and the utility model directly drives the oil pump by the camshaft, does not need to set a gear transmission mechanism between the crankshaft and the oil pump, and the installation position of the oil filter is fully utilized for the included angle space between the cylinder and the crankcase, thereby avoiding the problem that the volume of the crankcase is greatly increased, the installation space of the general engine is increased, and the general engine cannot be miniaturized, and the utility model realizes the effect that the general engine is miniaturized and has good lubrication effect. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic view of the cooperation relationship between the box, the cylinder and the oil filter of the utility model general engine crankcase;

[0022] Figure 2 It is a schematic view of the general engine crankcase of the utility model when the oil coarse filter is installed on the bottom of the box in Figure 1

[0023] Figure 3 It is a sectional view of the utility model general engine along the B-B cutting line in Figure 2

[0024] Figure 4 It is a sectional view of the utility model general engine along the B-B cutting line in Figure 1 ​​a sectional view taken along the A-A section line in the figure;

[0025] Figure 5 is a rear view of Figure 1

[0026] Figure 6 is a side view of the general-purpose engine along Figure 5 a sectional view taken along the C-C section line in the figure. DETAILED DESCRIPTION

[0027] The dotted arrow in the figure indicates the flow path of the oil.

[0028] As known to those skilled in the art, the oil filter is also called oil cleaner, and is also known as oil screen. It is used to remove dust, metal particles, carbon deposits and soot particles and other impurities in the oil. It is a mature product at present and will not be described here.

[0029] As known to those skilled in the art, the camshaft is a component in a piston engine. Its function is to control the opening and closing actions of the valve.

[0030] The following will be further described in detail through specific embodiments:

[0031] The reference signs in the attached drawings of the specification include: the box body 1, the mounting hole 2, the cylinder 3, the oil filter 4, the oil coarse filter 5, the crankshaft 6, the box cover 7, the camshaft 8, the oil pump 9, the oil inlet channel 10, the oil groove 11, the oil outlet channel 12, the support hole 13, and the cooling fan 14.

[0032] The embodiments are basically as shown in the attached drawings Figures 1 to 6 ​As shown: a general engine, including a crankcase, the crankcase including a box 1 and a cover 7, the box 1 is an open-end integral member, the open end of the box 1 is used as an assembly opening of the crankcase to assemble various components into the crankcase, and the cover 7 is bolted to the open end of the box 1. The side of the box 1 is connected with an obliquely arranged cylinder 3. The crankshaft 6 and the camshaft 8 are arranged in the crankcase and are connected with each other through a gear transmission mechanism. In this embodiment, the crankshaft 6 and the camshaft 8 are connected through the gear transmission mechanism. The side of the box 1 away from the cover 7 is provided with a cooling fan 14, and the cooling fan 14 is connected with the crankshaft 6, so that the cooling fan 14 rotates with the crankshaft 6 to generate a cooling airflow flowing towards the box 1. The side of the box 1 away from the cover 7 and below the cylinder 3 is provided with an oil filter 4. More preferably, the oil filter 4 is arranged directly below the cylinder 3. The end of the box 1 away from the cover 7 is provided with an oil inlet channel 10 for connecting the bottom of the crankcase with the oil filter 4, and an oil outlet channel 12 for guiding the oil discharged from the oil filter 4 to the friction surface. The oil pump 9 is arranged on the oil inlet channel 10. In this embodiment, the oil pump 9 is arranged at the end of the box 1 away from the cover 7 and is directly connected with the camshaft 8. In this embodiment, the oil pump 9 is detachably connected with the end of the camshaft 8. In this embodiment, the oil pump 9 is preferably a rotor type oil pump.

[0033] The box 1 is provided with a support hole 13 for supporting the camshaft 8, and a pump mounting cavity for mounting the oil pump 9. In this embodiment, the pump mounting cavity is located on one side of the middle of the support hole 13 away from the camshaft 8. The side of the box 1 facing away from the cover 7 is provided with a pump assembly hole communicating with the pump mounting cavity, and the box 1 is bolted with a sealing cover (not shown in the figure) sealingly matched with the pump assembly hole. In this embodiment, the support hole 13 is a stepped hole, and the small diameter end of the support hole 13 is arranged towards the pump mounting cavity.

[0034] The box 1 is provided with a mounting hole 2 rotatingly matched with the crankshaft 6, and the inner wall of the mounting hole 2 is provided with an oil groove 11 communicating with the oil outlet channel 12, so as to facilitate the delivery of the oil discharged from the oil filter 4 to the journal of the crankshaft 6 for lubrication. In this embodiment, the oil inlet channel 10 extends obliquely to the bottom of the box 1, and the end of the oil inlet channel 10 communicating with the bottom of the box 1 is arranged away from the oil pump 9. The end of the oil inlet channel 10 located at the bottom of the box 1 is connected with an oil coarse filter 5.

[0035] When the general engine is working, the crankshaft 6 drives the camshaft 8 to rotate through the gear transmission mechanism, the camshaft 8 drives the oil pump 9 to rotate, so that the oil at the bottom of the box 1 enters the oil coarse filter 5 under the action of the oil pump 9, and then enters the oil filter 4 along the oil inlet channel 10, and then enters the oil outlet channel 12 after being filtered by the oil filter 4, and then enters the oil groove 11 on the inner wall of the mounting hole 2 along the oil outlet channel 12, so as to realize the lubrication of the friction surface between the crankshaft 6 and the box 1.

[0036] The utility model discloses the advantages lie in: through the centralized arrangement of oil filter 4, oil pump 9, oil inlet channel 10 and oil outlet channel 12 in the box 1 and the side far from the box cover 7, and the direct drive of oil pump 9 work of camshaft 8 is combined, thereby make the length of oil outlet channel 12 and oil inlet channel 10 greatly shorten, and reduced the bending setting of oil channel, make the oil pressure loss reduce, the cooling airflow of cooling fan 14 can quickly take away the heat of the oil in oil pump 9, oil inlet channel 10 and oil outlet channel 12 when the generation of cooling airflow acts on the side of box 1 facing away from the box cover, thereby realizes the cooling of oil, thereby improved the lubrication effect of oil to the friction surface of the side far from the box cover of box, and further avoided the increase of maintenance frequency, and further need not set up gear drive mechanism between crankshaft 6 and oil pump 9, avoided the problem of the substantial increase of the volume of crankcase and the influence of the installation compatibility of universal engine.

[0037] The above-mentioned is only the embodiment of the utility model, and the well-known specific structure and characteristics of the scheme and the like are not described too much. It should be pointed out that for those skilled in the art, without departing from the structure of the utility model, a number of modifications and improvements can be made, which should also be considered as the protection range of the utility model, and these will not affect the effect and practicality of the utility model.

Claims

1. A general-purpose engine comprising a crankcase consisting mainly of a case and a case cover, the case being connected with a cylinder, a crankshaft and a camshaft being provided in the crankcase, an oil filter and a cooling fan being provided on the outside of the crankcase, an oil inlet passage and an oil outlet passage being provided on the case wall of the crankcase, an oil pump being provided on the oil inlet passage, characterized in that: The cooling fan, the oil filter, the oil outlet, the oil inlet and the oil pump are centrally arranged on the side of the box body away from the box cover; the oil pump is in transmission connection with the camshaft.

2. A general purpose engine as claimed in claim 1, characterized in that: The oil filter is located below the cylinder.

3. A general purpose engine according to claim 1 or 2, characterised in that: The oil inlet and the oil outlet are located inside the box wall of the box body facing the cooling fan.

4. A general purpose engine as claimed in claim 3, characterized in that: The oil pump is directly connected with the camshaft.

5. A general purpose engine as claimed in claim 4, characterized in that: The oil pump is directly connected with the end of the camshaft.

6. A general purpose engine as claimed in claim 5, characterized in that: A pump mounting cavity for mounting the oil pump is arranged on the box body.

7. A general purpose engine as claimed in claim 6, characterized in that: A pump assembly hole in communication with the pump mounting cavity is arranged on the side of the box body away from the box cover, and a sealing cover in sealing cooperation with the pump assembly hole is detachably connected to the box body.

8. A general purpose engine as claimed in claim 7, characterized in that: A support hole for supporting the camshaft is arranged on the side of the pump mounting cavity of the box body facing the middle of the camshaft, the support hole is in the form of a stepped hole, and the small-diameter end of the support hole faces the pump mounting cavity.

9. A universal engine as claimed in claim 1, 2, 4, 5, 6, 7 or 8, characterized in that: An installation hole in rotation cooperation with the crankshaft is arranged on the box body, and an oil groove in communication with the oil outlet is arranged on the inner wall of the installation hole.

10. A general purpose engine as claimed in claim 9, characterized in that: The oil inlet extends obliquely to the bottom of the box body.

11. A general purpose engine as claimed in claim 10, wherein: An oil coarse filter is connected to one end of the bottom of the box body.

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