CN214007496U - Oil pump and engine lubricating system - Google Patents

Abstract

The embodiment of the utility model provides an oil pump and engine lubrication system. The utility model provides an oil pump includes: the pump body is provided with a cylindrical part protruding from the bottom, a rotor cavity is defined by the inner wall of the cylindrical part, the cylindrical part is used for being embedded into an inwards-recessed mounting cavity of an engine body, a mounting plate is arranged on the outer side of the cylindrical part, the mounting plate is located at the end part of the cylindrical part and is fixedly connected with the cylindrical part, and the mounting plate is connected with the engine body through bolts; the rotor is arranged in the rotor cavity, the rotor cavity is divided into an oil inlet cavity and an oil outlet cavity by the rotor, the oil inlet cavity is communicated with an oil inlet of the engine body, and the oil outlet cavity is communicated with an oil outlet of the engine body. The utility model also provides an engine lubrication system includes the engine organism and foretell oil pump. The utility model provides an installation face of oil pump and engine organism is less, and required fastening bolt is small in quantity, and the cost that has reduced the manufacturing accords with the engine lightweight requirement.

Description

Oil pump and engine lubricating system

Technical Field

The embodiment of the utility model provides a relate to the engine technology, especially relate to an oil pump and engine lubrication system.

Background

The oil pump is an important part in an engine lubricating system and is used for hydraulically conveying oil to the moving surfaces of various friction parts in an engine body after the oil is increased to a certain pressure. Without an oil pump, the oil is difficult to reach each friction part, and the lubricating effect cannot be effectively exerted.

The oil pump in the related technology comprises a pump body, an inner rotor and an outer rotor, wherein the inner rotor and the outer rotor are arranged in a rotor cavity of the pump body, the outer rotor is sleeved outside the inner rotor, an inner cavity of the outer rotor is divided into a certain number of working cavities by the inner rotor, the volume of an oil inlet of the oil pump of the working cavities is increased, lubricating oil is sucked in the working cavities, the volume of an oil outlet of the oil pump is reduced, the lubricating oil is pressed out, and an oil inlet cavity of the oil pump and an oil outlet cavity of the oil pump are formed between the outer rotor and the inner rotor. The pump body and the engine body are positioned through a positioning pin and fixedly connected through a bolt.

However, the pump body is matched with the engine body through a plane, and the mounting surface of the pump body and the engine body is large, so that the oil pump needs more fastening bolts and the engine has heavy weight.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides an oil pump and engine lubrication system to the installation face of solving current oil pump body and engine organism is great, and the fastening bolt that leads to the oil pump needs is more, the great problem of engine weight

According to the utility model discloses an aspect provides an oil pump, include:

the pump body is provided with a cylindrical part protruding from the bottom, a rotor cavity is defined by the inner wall of the cylindrical part, the cylindrical part is used for being embedded into an installation cavity of an engine body, the installation cavity is recessed inwards, an installation plate is arranged on the outer side of the cylindrical part, the installation plate is located at the end part of the cylindrical part and is fixedly connected with the cylindrical part, and the installation plate is connected with the engine body through bolts;

the rotor cavity is divided into an oil inlet cavity and an oil outlet cavity by the rotor, the oil inlet cavity is communicated with an oil inlet of the engine body, the oil outlet cavity is communicated with an oil outlet of the engine body, and the oil inlet and the oil outlet of the engine body are located on the bottom wall of the mounting cavity.

In an alternative implementation, the sealing gasket is located between the bottom surface of the cylindrical portion and the mounting cavity of the engine block.

In an alternative implementation, the mounting plate is provided with at least three bolt holes, the bolt holes are located on the outer side of the cylindrical portion, and connecting lines between adjacent bolt holes intersect.

In an optional implementation manner, a feedback oil duct is arranged in the pump body, a first end of the feedback oil duct is used for being connected with the top end of a main oil duct of the engine body, a second end of the feedback oil duct is connected with a pressure control port of a pressure limiting valve, the pressure limiting valve is arranged at the top of an oil outlet cavity, and the pressure limiting valve is used for opening when the pressure of the main oil duct exceeds a preset pressure so as to discharge oil in the oil outlet cavity to the outside of the oil pump.

In an optional implementation manner, the first end of the feedback oil passage is connected with the engine body through a joint, and the joint is fixedly connected with the pump body.

In an alternative implementation, the outer side wall of the joint is sleeved with a sealing ring.

In an optional implementation, the rotor includes external rotor and inner rotor, the external rotor cover is established at the inner rotor outside, the axis of external rotor, the axis of inner rotor with the axis of cartridge type portion is parallel, the outer wall of external rotor with the inner wall laminating of cartridge type portion, the external rotor with inner rotor intermeshing, the number of teeth of external rotor is greater than the number of teeth of inner rotor, the rotational speed of external rotor is less than the rotational speed of inner rotor, the external rotor with the inner rotor forms oil feed chamber and oil outlet chamber.

In an optional implementation manner, the pump further includes a transmission shaft and a driving wheel, an axis of the transmission shaft is parallel to an axis of the cylindrical portion, a first end of the transmission shaft is fixedly connected with the inner rotor, and a second end of the transmission shaft passes through the top surface of the pump body and then is fixedly connected with the driving wheel.

In an alternative implementation, the drive wheel is a sprocket.

According to another aspect of the embodiments of the present invention, there is provided an engine lubrication system, including an engine body and the oil pump;

the engine body is connected with the oil pump through bolts, an oil inlet of the engine body is communicated with an oil inlet cavity of the oil pump, and an oil outlet of the engine body is communicated with an oil outlet cavity of the oil pump;

the engine body is also provided with a main oil duct extending in the vertical direction, and the top end of the main oil duct is connected with a feedback oil duct of the oil pump through a joint.

As can be understood by those skilled in the art, the oil pump of the utility model comprises a pump body and a rotor, wherein the pump body is provided with a cylindrical part protruding from the bottom, a rotor cavity is defined by the inner wall of the cylindrical part, the cylindrical part is used for embedding an installation cavity of an engine body, the cylindrical part is provided with a mounting plate outside, the mounting plate is located the end part of the cylindrical part and is fixedly connected with the cylindrical part, and the mounting plate is connected with the engine body through bolts. The rotor is arranged in the rotor cavity, the rotor cavity is divided into an oil inlet cavity and an oil outlet cavity by the rotor, the oil inlet cavity is communicated with an oil inlet of the engine body, the oil outlet cavity is communicated with an oil outlet of the engine body, and the oil inlet and the oil outlet of the engine body are located on the bottom wall of the mounting cavity. Like this, the pump body is changed into the mounting cavity of concave-convex structure cooperation promptly the barrel-shaped portion embedding engine body with the engine body by original plane and plane cooperation, the mounting panel and the engine body bolted connection of pump body, the mounting panel of pump body and engine body be the mounting panel and face one side area reduction of engine body, so the bolt that needs the fastening reduces, reduces engine weight, accords with the engine lightweight requirement.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

FIG. 1 is a schematic diagram of an oil pump and an engine block in the prior art;

fig. 2 is a schematic structural diagram of an oil pump and an engine body provided in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of the oil pump provided in the embodiment of the present invention at another viewing angle;

fig. 4 is a schematic structural diagram of an inner rotor and an outer rotor according to an embodiment of the present invention;

fig. 5 is a schematic structural view illustrating the communication between the feedback oil duct and the main oil duct of the engine body according to the embodiment of the present invention.

Description of reference numerals:

1-an oil pump; 11-a pump body;

111-barrel section; 112-an oil inlet cavity;

113-an oil outlet cavity; 114-a mounting plate;

115 — a first bolt hole; 116-a feedback oil gallery;

12-a rotor; 121-an inner rotor;

122-outer rotor; 13-a pressure limiting valve;

14-a linker; 15-driving wheel;

2-an engine body; 21-mounting a cavity;

22-main oil gallery; 23-positioning pin.

Detailed Description

First of all, it should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be modified as needed by those skilled in the art to suit particular applications.

Next, it should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "inside", "outside", and the like are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that a device or member must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.

Fig. 1 is a schematic structural diagram of an oil pump and an engine body in the prior art. As shown in fig. 1, in the conventional technique, the oil pump 1 and the engine body 2 are laminated on each other in a plane-to-plane manner, that is, the oil pump 1 is formed to have a flat surface on the side facing the engine body 2, and the engine body 2 is formed to have a flat surface at a position for mounting the oil pump 1. The engine body 2 is provided with a positioning pin 23, the engine oil pump 1 and the engine body 2 are positioned by the positioning pin 23, that is, the positioning pin 23 is fixedly connected with the engine body 2, when the engine oil pump 1 is assembled, the positioning pin 23 is embedded into the engine oil pump 1, and the engine oil pump 1 is fixed on the engine body 2 by bolts. However, the pump body is matched with the engine body 2 through a plane, and the mounting surface of the pump body and the engine body 2 is large, so that more fastening bolts are needed, and the weight of the engine is large.

After repeated thinking and verification, the inventor finds that if a part of the pump body, such as a rotor cavity, is set to be a convex structure, and meanwhile, a mounting cavity matched with the convex structure is arranged on the engine body, the convex structure of the pump body is embedded into the mounting cavity of the engine body in the process of assembling the oil pump, and other parts of the pump body, such as a mounting plate, are in bolted connection with the engine body. Like this, change original plane and plane complex mode into unsmooth complex mode, compare in prior art, the installation face is the area of mounting panel towards engine organism one side reduces promptly, under the prerequisite of guaranteeing sealed, required fastening bolt reduces, and then has reduced the weight of engine, accords with the requirement of engine lightweight.

In view of the above, the inventor has devised an oil pump including a pump body and a rotor. The pump body is provided with from the convex cartridge type portion in bottom, and the rotor chamber is injectd to the inner wall of cartridge type portion, and cartridge type portion is used for imbedding the inside sunken installation cavity of engine organism, and the cartridge type portion outside is provided with the mounting panel, and the mounting panel is located the tip of cartridge type portion and with cartridge type portion fixed connection, mounting panel and engine organism bolted connection. The rotor is arranged in the rotor cavity, the rotor cavity is divided into an oil inlet cavity and an oil outlet cavity by the rotor, the oil inlet cavity is communicated with an oil inlet of the engine body, the oil outlet cavity is communicated with an oil outlet of the engine body, and the oil inlet and the oil outlet of the engine body are located on the bottom wall of the mounting cavity. Like this, the cylindrical portion of the pump body passes through mounting panel and engine body bolted connection after embedding the installation cavity of engine body, and the area of mounting panel reduces to some extent compared with prior art, and required fastening bolt quantity reduces, and the total weight of engine lightens, accords with the requirement of engine lightweight.

Example one

Fig. 2 is a schematic structural diagram of the oil pump and the engine body according to this embodiment. As shown in fig. 2, the oil pump 1 of the present embodiment includes a pump body 11, and the pump body 11 is provided with a cylindrical portion 111 protruding from a bottom portion, and exemplarily, the cylindrical portion 111 protrudes leftward from the pump body 11. The length of the cylindrical portion 111 protruding from the pump body 11 is not limited in this embodiment, and can be set by those skilled in the art according to actual needs. The inner wall of the cylindrical part 111 defines a rotor cavity, i.e. the rotor rotates in the rotor cavity, and the oil pump 1 uses the rotation of the rotor to suck and press oil.

It should be noted that the "cylindrical shape" is used herein in a broad sense, i.e., the cross section of the cylindrical shape is not limited to a circular shape, and the sizes of the respective cross sections of the cylindrical shape may be equal or different.

Fig. 2 shows that the engine body 2 is provided with a mounting cavity 21 recessed inward, and the shape of the mounting cavity 21 matches the shape of the cylindrical portion 111, so that the cylindrical portion 111 can be fitted into the mounting cavity 21. For example, the shape of the mounting cavity 21 may be any suitable shape such as a circle, a square, etc., that is, the shape of the outer side wall of the cylindrical portion 111 may also be any suitable shape such as a circle, a square, etc., and those skilled in the art can set the shapes of the mounting cavity 21 and the cylindrical portion 111 according to actual needs.

Preferably, the bottom of the mounting cavity 21 is further provided with a gasket, i.e. the gasket is located between the bottom surface of the cylindrical portion 111 and the mounting cavity 21 of the engine body 2. In one possible implementation, the gasket is made of an elastic material such as rubber, and after the cylindrical portion 111 is fitted into the mounting cavity 21 of the engine block 2, the bottom end of the cylindrical portion 111 and the mounting cavity 21 press the gasket to elastically deform the gasket, and the cylindrical portion 111 is sealed by the deformation of the gasket.

It can be understood by those skilled in the art that a sealing gasket is disposed between the bottom surface of the cylindrical portion 111 and the mounting cavity 21 of the engine body 2, so as to perform a sealing function to prevent pressure leakage, so that the oil pump 1 can smoothly suck and press oil.

Fig. 3 is a schematic structural diagram of the oil pump provided in this embodiment at another view angle. As shown in fig. 2 to 3, a mounting plate 114 is disposed outside the cylindrical portion 111, the mounting plate 114 is located at an end of the cylindrical portion 111 and is fixedly connected to the cylindrical portion 111, and the mounting plate 114 and the cylindrical portion 111 are exemplarily formed as a single piece through a one-step molding process. It is easily understood that the mounting plate 114 is perpendicular to the axis of the cylindrical portion 111, and the shape of the mounting plate 114 is not limited in this embodiment, and those skilled in the art can set the shape of the mounting plate 114 according to actual needs. The mounting plate 114 is used for being bolted to the engine body 2, and it is easy to understand that the side surface of the mounting plate 114 facing the engine body 2 is a mounting surface, the mounting plate 114 is arranged outside the cylindrical portion 111, and the oil pump 1 can be prevented from being separated from the surface of the engine body 2 by bolting the mounting plate 114 to the engine body 2.

Specifically, as shown in fig. 2 to 3, the mounting plate 114 is provided with a plurality of first bolt holes 115, the first bolt holes 115 are located outside the cylindrical portion 111, and the axes of the first bolt holes 115 are arranged in the thickness direction of the mounting plate 114, and accordingly, the engine body 2 is also provided with a plurality of second bolt holes at the edge of the mounting cavity 21, and the second bolt holes correspond to the first bolt holes 115 in position one to one. During assembly, the oil pump 1 can be fastened on the surface of the engine body 2 by sequentially passing bolts through the first bolt holes 115 and the second bolt holes. It should be noted that connecting lines between adjacent first bolt holes 115 intersect, that is, the plurality of first bolt holes 115 are not located on the same straight line, and preferably, the plurality of first bolt holes 115 are uniformly arranged along the axial direction of the cylindrical portion 111, so as to ensure that the cylindrical portion 111 is uniformly stressed in all directions.

It is easily understood that the number of the first bolt holes 115 is non-limiting, and may be three or more than three, and when the number of the first bolt holes 115 is three, the three first bolt holes 115 may be located at three apexes of a triangle, respectively; when the number of the first bolt holes 115 exceeds three, for example, the number of the first bolt holes 115 shown in fig. 3 is four, the four first bolt holes 115 may be located at four vertices of a rectangle, respectively.

As will be understood by those skilled in the art, the oil pump 1 provided in the present embodiment is inserted into the mounting cavity 21 of the engine body 2 through the protruding cylindrical portion 111, and is bolted to the engine body 2 using the mounting plate 114. Compared with the prior art in fig. 1 in which the end face of the oil pump 1 is simply used for being bolted to the engine body 2, the mounting plate 114 has a relatively small area, that is, the number of bolts to be fastened is reduced, so that the overall weight of the engine is reduced, and the requirement of engine light weight is met.

Fig. 4 is a schematic structural diagram of the inner rotor and the outer rotor provided in this embodiment. As shown in fig. 3-4, the oil pump 1 of the present embodiment further includes a rotor 12, the rotor 12 is disposed inside the cylindrical portion 111, that is, inside a rotor cavity, the rotor 12 divides the rotor cavity into an oil inlet cavity 112 and an oil outlet cavity 113, the oil inlet cavity 112 is communicated with an oil inlet of the engine body 2, and the oil outlet cavity 113 is communicated with an oil outlet of the engine body 2. By the rotation of the rotor 12 in the rotor cavity, the engine oil enters the oil inlet cavity 112 from the oil inlet of the engine body 2, and then enters the oil outlet of the engine body 2 from the oil outlet cavity 113, so that the engine oil moves in the engine body 2, and further moves to the surface of each friction pair in the engine body 2 for lubrication. It is easy to understand that the oil inlet and the oil outlet of the engine body 2 are located at the bottom wall of the mounting cavity 21, and exemplarily, the oil inlet and the oil outlet of the engine body 2 are respectively located at two opposite sides of the bottom wall of the mounting cavity 21, that is, the oil pump 1 draws oil from one side of the bottom wall of the mounting cavity 21 and presses oil in from the other side, so that the oil circulates inside the engine body 2.

One possible implementation is that, as shown in fig. 2 and 4, the rotor 12 includes an outer rotor 122 and an inner rotor 121, and the outer rotor 122 is sleeved outside the inner rotor 121 and is meshed with the inner rotor 121. The axis of the outer rotor 122 and the axis of the inner rotor 121 are respectively located on two parallel straight lines and are parallel to the axis of the cylindrical portion 111. The number of teeth of the outer rotor 122 is greater than the number of teeth of the inner rotor 121, and illustratively, the number of teeth of the outer rotor 122 is equal to the number of teeth of the inner rotor 121 plus one. The rotating speed of the outer rotor 122 is less than that of the inner rotor 121, the inner cavity of the outer rotor 122 is divided into a certain number of working cavities by the inner rotor 121, the volumes of the working cavities are increased at the oil inlet of the engine body 2, engine oil is sucked in, the volumes of the oil outlets of the engine body 2 are reduced, and the engine oil is extruded out. It is easy to understand that the working chamber communicating with the oil inlet of the engine body 2 is the oil inlet chamber 112; the working chamber communicating with the oil outlet of the engine body 2 is an oil outlet chamber 113.

As will be understood by those skilled in the art, the rotor 12 is configured to include the outer rotor 122 and the inner rotor 121, and the outer rotor 122 is sleeved outside the inner rotor 121 and is meshed with the inner rotor 121, it is easy to understand that the volume of the cylindrical portion 111 and the volume of the rotor cavity are small, and the oil is driven to move in the engine body 2 by the rotation of the rotor 12 to achieve lubrication.

Of course, in another implementation manner, the rotor 12 may also be configured as a driving gear and a driven gear which are arranged side by side and are engaged with each other, the driving gear and the driven gear divide the rotor cavity into a low-pressure cavity, i.e., an oil inlet cavity 112, a high-pressure cavity, and an oil outlet cavity 113, the oil inlet cavity 112 is communicated with an oil inlet of the engine body 2, and the oil outlet cavity 113 is communicated with an oil outlet of the engine body 2.

As shown in fig. 2 to 4, the oil pump 1 of the present embodiment further includes a transmission shaft (not shown in the drawings) and a driving wheel 15, the axis of the transmission shaft is parallel to the axis of the cylindrical portion 111, a first end of the transmission shaft is fixedly connected to the inner rotor 121, for example, the first end of the transmission shaft and the inner rotor 121 may be connected by a key, a second end of the transmission shaft passes through the top surface of the pump body 11 and then is fixedly connected to the driving wheel 15, and the transmission shaft and the driving wheel 15 may also be connected by a key.

As can be understood by those skilled in the art, the transmission shaft and the driving wheel 15 are arranged to drive the inner rotor 121 to synchronously rotate through the rotation of the driving wheel 15, and because the inner rotor 121 and the outer rotor 122 are engaged with each other, the inner rotor 121 rotates to drive the outer rotor 122 to rotate, the engine oil is sucked into the oil inlet cavity 112 from the oil inlet of the engine body 2 through the rotation of the inner rotor 121 and the outer rotor 122, and the engine oil is pressed into the oil outlet of the engine body 2 from the oil outlet cavity 113, so that the engine oil circulates inside the engine body 2.

One possible way of realizing this is to use a sprocket as the drive wheel 15, i.e. a chain can be used as the transmission mechanism to rotate the drive wheel 15. It is easy to understand that the use of the sprocket as the driving wheel 15 can ensure the accuracy of the transmission ratio and avoid the occurrence of slipping.

Fig. 5 is a schematic structural diagram of the communication between the feedback oil passage and the main oil passage of the engine body according to the present embodiment. As shown in fig. 5, a feedback oil passage 116 is provided in the pump body 11, and exemplarily, the feedback oil passage 116 is formed in an inverted "L-shaped structure", a first end of the feedback oil passage 116, that is, a bottom end of the "L-shaped structure", is connected to a top end of the main oil passage 22 of the engine body 2, a second end of the feedback oil passage 116, that is, a left end of the "L-shaped structure", is connected to a pressure control port of the pressure limiting valve 13, the pressure limiting valve 13 is provided at a top portion of the oil outlet chamber 113, and the pressure limiting valve 13 is configured to open to discharge oil in the oil outlet chamber 113 to the outside of the oil pump 1 when a pressure of the.

One possible implementation manner is that the pressure limiting valve 13 includes a valve body, a valve core, and a spring, the valve body is in a cylindrical structure and is fixedly connected to the pump body 11, one end of the valve body is plugged, the other end of the valve body is communicated with the feedback oil duct 116, an oil drain port is provided on the side wall of the valve body, and the oil drain port is communicated with the oil outlet cavity 113. The middle part of the valve core is provided with a necking part and can do reciprocating motion in the valve body. Under normal conditions, the valve core is abutted against the feedback oil channel 116 through a spring to cut off a passage between the oil drainage port and the oil outlet cavity 113; when the pressure of the main oil gallery 22 exceeds a preset value, oil in the main oil gallery 22 pushes the valve core to move to compress the spring, the necking part of the valve core moves to a position between the oil drainage port and the oil outlet cavity 113, and the oil in the oil outlet cavity 113 is discharged out of the oil pump 1 through the oil drainage port of the valve body. It is easy to understand that the end of the valve core abutting against the feedback oil passage 116 is the pressure control port of the pressure limiting valve 13, and the preset pressure is the elastic force of the spring when the necking part of the valve core moves to the position between the oil drain port and the oil outlet cavity 113. The skilled person can set the magnitude of the preset pressure according to actual needs.

It will be understood by those skilled in the art that the pump body 11 and the feedback oil passage 116 are provided to allow the oil pump 1 to control the oil supply amount, and when the pressure in the main oil passage 22 exceeds a predetermined pressure, which indicates that the oil amount required by the engine body 2 is less than the oil amount supplied by the oil pump 1, the excess oil amount flows from the oil outlet chamber 113 into the pressure limiting valve 13 and is discharged from the oil discharge port of the pressure limiting valve 13.

As shown in fig. 2 and 5, the first end of the feedback oil passage 116, i.e., the bottom end of the "L-shaped structure", is connected to the engine body 2 through the joint 14, and one possible implementation manner is that the joint 14 is fixedly connected to the pump body 11, and for example, the joint 14 and the pump body 11 may be made as a single piece.

As can be understood by those skilled in the art, by providing the joint 14 on the pump body 11 and connecting the feedback oil passage 116 with the main oil passage 22 of the engine body 2 through the joint, not only can the quick connection between the feedback oil passage 116 and the main oil passage 22 be realized during the assembly of the engine oil pump 1, but also the oil pump 1 can be positioned by using the joint 14, that is, the oil pump 1 can be fastened to the surface of the engine body 2 by using bolts after the joint 14 is inserted into the main oil passage 22 of the engine body 2.

Preferably, the outer side wall of the joint 14 is sleeved with a sealing ring, and illustratively, the outer side wall of the joint 14 is provided with a ring groove, and the sealing ring is embedded in the ring groove. It will be readily appreciated that providing a seal ring on the outer side wall of the joint 14 to seal the joint 14 with the main gallery 22 may avoid oil leakage at the junction of the main gallery 22 and the feedback gallery 116.

Example two

On the basis of the first embodiment, the present embodiment further provides an engine lubrication system, which includes an engine body and the oil pump in the first embodiment.

The engine body is connected with the oil pump through bolts, an oil inlet of the engine body is communicated with an oil inlet cavity of the oil pump, and an oil outlet of the engine body is communicated with an oil outlet cavity of the oil pump. The engine body is also provided with a main oil duct extending in the vertical direction, and the top end of the main oil duct is connected with a feedback oil duct of the oil pump through a joint.

As will be appreciated by those skilled in the art, it is desirable to provide an oil pick-up passage in the engine block that communicates with the main oil gallery. Specifically, the oil taking channel is provided with a vertical section and a horizontal section, the top end of the vertical section is communicated with a feedback oil channel of the oil pump, the bottom end of the vertical section is communicated with the middle of the horizontal section, the first end of the horizontal section is sealed by a bowl-shaped plug, the second section of the horizontal section is communicated with the middle of the main oil channel, and the top end of the main oil channel is sealed by the bowl-shaped plug, so that the engine oil is ensured to enter the feedback oil channel of the oil pump after sequentially passing through the main oil channel, the horizontal section and the vertical section. The engine oil needs to pass through two bending sections in the process of flowing from the main oil duct to the feedback oil duct, so that the pressure feedback of the engine oil is not quick, and the weight of the two bowl-shaped plugs is increased. In the embodiment, the main oil gallery is arranged to extend in the vertical direction, and the top end of the main oil gallery is directly communicated with the feedback oil gallery, so that the agility of engine oil pressure feedback is improved on one hand; on the other hand, the weight increase of the engine caused by using the bowl-shaped plug is avoided.

The oil pump in this embodiment has the same structure as the oil pump provided in the first embodiment, and can bring about the same or similar technical effects, and details are not repeated here, and specific reference may be made to the description of the above embodiments.

In the description of the present invention, it is to be understood that the terms "top," "bottom," "upper," "lower" (if present), and the like, are used in the orientation or positional relationship shown in the drawings for convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The terms "first" and "second" in the description and claims of the present application and the description of the above-described figures are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. An oil pump, comprising:

the pump body is provided with a cylindrical part protruding from the bottom, a rotor cavity is defined by the inner wall of the cylindrical part, the cylindrical part is used for being embedded into an installation cavity of an engine body, the installation cavity is recessed inwards, an installation plate is arranged on the outer side of the cylindrical part, the installation plate is located at the end part of the cylindrical part and is fixedly connected with the cylindrical part, and the installation plate is connected with the engine body through bolts;

the rotor cavity is divided into an oil inlet cavity and an oil outlet cavity by the rotor, the oil inlet cavity is communicated with an oil inlet of the engine body, the oil outlet cavity is communicated with an oil outlet of the engine body, and the oil inlet and the oil outlet of the engine body are located on the bottom wall of the mounting cavity.

2. The oil pump according to claim 1, further comprising a gasket between a bottom surface of the cylindrical portion and a mounting cavity of the engine body.

3. The oil pump according to claim 1, wherein the mounting plate is provided with at least three bolt holes located outside the cylindrical portion, and connecting lines between adjacent bolt holes intersect.

4. The oil pump according to any one of claims 1 to 3, wherein a feedback oil passage is arranged in the pump body, a first end of the feedback oil passage is used for being connected with the top end of a main oil passage of the engine body, a second end of the feedback oil passage is connected with a pressure control port of a pressure limiting valve, the pressure limiting valve is arranged at the top of an oil outlet cavity, and the pressure limiting valve is used for opening when the pressure of the main oil passage exceeds a preset pressure so as to discharge oil in the oil outlet cavity to the outside of the oil pump.

5. The oil pump of claim 4, wherein the first end of the feedback oil passage is connected to the engine block by a joint, and the joint is fixedly connected to the pump body.

6. The oil pump of claim 5, wherein a seal ring is sleeved on an outer side wall of the joint.

7. The oil pump according to any one of claims 1 to 3, wherein the rotor includes an outer rotor and an inner rotor, the outer rotor is sleeved outside the inner rotor, the axis of the outer rotor and the axis of the inner rotor are parallel to the axis of the cylindrical portion, the outer wall of the outer rotor is attached to the inner wall of the cylindrical portion, the outer rotor and the inner rotor are meshed with each other, the number of teeth of the outer rotor is greater than that of the inner rotor, the rotation speed of the outer rotor is less than that of the inner rotor, and the outer rotor and the inner rotor form an oil inlet cavity and an oil outlet cavity.

8. The oil pump of claim 7, further comprising a transmission shaft and a driving wheel, wherein the axis of the transmission shaft is parallel to the axis of the cylindrical portion, the first end of the transmission shaft is fixedly connected with the inner rotor, and the second end of the transmission shaft penetrates through the top surface of the pump body and is fixedly connected with the driving wheel.

9. The oil pump of claim 8, wherein the drive pulley is a sprocket.

10. An engine lubrication system, characterized by comprising an engine body, and the oil pump of any one of claims 1 to 9;

the engine body is connected with the oil pump through bolts, an oil inlet of the engine body is communicated with an oil inlet cavity of the oil pump, and an oil outlet of the engine body is communicated with an oil outlet cavity of the oil pump;

the engine body is also provided with a main oil duct extending in the vertical direction, and the top end of the main oil duct is connected with a feedback oil duct of the oil pump through a joint.

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