CN107327688B

CN107327688B - Oil pump with double-rotor structure

Info

Publication number: CN107327688B
Application number: CN201710704736.0A
Authority: CN
Inventors: 许仲秋; 刘小江
Original assignee: Hunan Oil Pump Co Ltd
Current assignee: Hunan Oil Pump Co Ltd
Priority date: 2017-08-17
Filing date: 2017-08-17
Publication date: 2022-12-06
Anticipated expiration: 2037-08-17
Also published as: CN107327688A

Abstract

The invention provides an oil pump with a double-rotor structure, which relates to the technical field of oil pumps and comprises a pump body, a pump cover, a driving shaft, an inner rotor and an outer rotor, wherein the inner rotor and the outer rotor are positioned in a rotor cavity of the pump body; oil inlet and oil-out have been seted up on the pump body, and the inner rotor is installed on the driving shaft, and the driving shaft passes the pump body and pump cover, and the outer rotor suit is in the inner rotor outside, its characterized in that: the inner rotor comprises a first inner rotor and a second inner rotor, the outer rotor comprises a first outer rotor and a second outer rotor, the thickness of the first outer rotor is larger than that of the first inner rotor, the first outer rotor is sleeved on the first inner rotor and the second inner rotor, and the second outer rotor is sleeved on the second inner rotor. The invention has the advantages of simple manufacture, large oil pumping quantity and high oil pressure, and can be suitable for large engines.

Description

Oil pump with double-rotor structure

Technical Field

The invention relates to the technical field of oil pumps, in particular to a rotor type oil pump.

Background

In a lubricating system, an oil pump is used for forcibly pressing and conveying oil to the moving surfaces of various parts of an engine after the oil is increased to a certain pressure, and the rotor type oil pump is one type of oil pumps and has the characteristics of compact structure, small overall dimension, light weight, large oil suction vacuum degree, large oil pumping amount, good oil supply uniformity, low cost and the like.

Powder metallurgy is a process technology for manufacturing metal powder or metal powder used as a raw material to manufacture metal materials, composite materials and various products through forming and sintering, has unique chemical composition and mechanical and physical properties, and the properties cannot be obtained by using a traditional fusion casting method.

Based on the above analysis, it can be known that the rotor type oil pump matched with the large-scale engine is difficult to manufacture by using a powder metallurgy process because the rotor part is too thick, and difficult to meet the process requirements if the rotor part is manufactured by using a traditional casting method, so that the research and development of the rotor type oil pump which is simple in manufacturing process, can also realize high oil pressure and large discharge capacity in the technical field of the oil pump always becomes the key point of attention in the field.

Disclosure of Invention

The invention aims to solve the technical problem of providing the oil pump with the double-rotor structure, which is simple to manufacture, has large oil pumping quantity and high oil pressure and can be suitable for large engines.

In order to achieve the purpose, the invention adopts the following technical scheme: including the pump body, pump cover, driving shaft and be located inner rotor and the outer rotor of pump body, the inner rotor is fixed on the driving shaft, the outer rotor suit is on the inner rotor, oil inlet and oil-out have been seted up on the pump body, the inner rotor includes first inner rotor and second inner rotor, just the terminal surface of first inner rotor closely laminates with the terminal surface of second inner rotor, the outer rotor includes first outer rotor and the outer rotor of second, just the terminal surface of first outer rotor and the outer rotor of second closely laminates, the thickness of second inner rotor is greater than the thickness of the outer rotor of second, just the thickness sum of first inner rotor, second inner rotor equals the thickness sum of first outer rotor, the outer rotor of second.

Further, an oil suction cavity and an oil discharge cavity are formed in the pump body and the pump cover, the oil inlet is communicated with the oil suction cavity of the pump body and the oil suction cavity of the pump cover, the oil outlet comprises a first oil outlet and a second oil outlet, the first oil outlet is communicated with the oil discharge cavity of the pump body, and the second oil outlet is communicated with the oil discharge cavity of the pump cover.

Furthermore, the driving shaft is connected with the first inner rotor and the second inner rotor through keys.

Furthermore, a valve chamber communicated with the oil discharge cavity is formed in the pump cover, a pressure limiting valve is arranged in the valve chamber, an oil discharge passage with one end communicated with the valve chamber and the other end communicated with the engine transmission system is formed in the pump body, and under the condition that the pressure limiting valve is opened, oil in the oil discharge cavity of the pump cover can enter the oil discharge passage and can be discharged into the transmission system of the engine.

Furthermore, the pressure limiting valve comprises a plunger and a spring, one end of the spring is positioned in the plunger, the other end of the spring is fixed at the lower part of the valve chamber, and the plunger is subjected to hydraulic pressure of the oil discharge chamber and elastic force of the spring.

Preferably, the pressure limiting valve further comprises an adjusting bolt, a cover plate installed at the bottom of the valve chamber and a sealing cover installed in the valve chamber in a sliding mode, one end of the spring is located in the plunger, the other end of the spring is fixed to the sealing cover, the adjusting bolt penetrates through the cover plate and is in threaded connection with the cover plate, the tail end of the adjusting bolt is in contact with the sealing cover, and the head end of the adjusting bolt is located outside the cover plate.

The invention has the beneficial effects that: the oil pump with the double-rotor structure has the advantages that the two rotors are arranged in the pump body and can be manufactured by a powder metallurgy process respectively, so that the manufacturing difficulty is reduced; the first outer rotor is sleeved on the first inner rotor and also sleeved on the second inner rotor, so that the rotation synchronism of the two sets of rotors can be effectively improved, and the two sets of rotors can synchronously work, so that the oil pressure and the flow rate of the pump can reach high values, and the invention can be suitable for large-scale engines.

Drawings

FIG. 1 is a cross-sectional view of an embodiment of the present invention;

FIG. 2 is a side view of an embodiment of the present invention;

fig. 3 is a cross-sectional view of a pressure limiting valve in an embodiment of the present invention.

The reference signs are:

1-pump body 2-pump cover 3-driving shaft

4-inner rotor 41-first inner rotor 42-second inner rotor

5-outer rotor 51-first outer rotor 52-second outer rotor

6-oil inlet 7-oil outlet 71-first oil outlet

72-second oil outlet 8-key 9-pressure limiting valve

91-plunger 92-spring 93-adjusting bolt

94-cover plate 95-sealing cover 10-pressure relief channel

11-transmission gear.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or interconnected between two elements, directly or indirectly through intervening media, and the specific meaning of the terms may be understood by those skilled in the art according to their specific situation.

As shown in fig. 1-3, a dual-rotor structure oil pump includes a pump body 1, a pump cover 2, a driving shaft 3, and an inner rotor 4 and an outer rotor 5 located in a rotor cavity of the pump body 1, wherein the inner rotor 4 is fixed on the driving shaft 3, the outer rotor 5 is sleeved outside the inner rotor 4, the pump body 1 is provided with an oil inlet 6 and an oil outlet 7, the inner rotor 4 includes a first inner rotor 41 and a second inner rotor 42, an end surface of the first inner rotor 41 is tightly attached to an end surface of the second inner rotor 42, the outer rotor 5 includes a first outer rotor 51 and a second outer rotor 52, an end surface of the first outer rotor 51 is tightly attached to an end surface of the second outer rotor 52, a thickness of the second inner rotor 42 is greater than a thickness of the second outer rotor 52, a sum of the thicknesses of the first inner rotor 41 and the second inner rotor 42 is equal to a sum of thicknesses of the first outer rotor 51 and the second outer rotor 52, the first outer rotor 51 is further sleeved on the first inner rotor 41.

In the dual-rotor oil pump provided by the embodiment, the pump body 1 is internally provided with two sets of rotors which can be manufactured separately and then combined and installed on the driving shaft 3, and similarly, the whole manufacturing process adopts a powder metallurgy technology, so that the process difficulty is greatly reduced; the first outer rotor 51 and the second outer rotor 52 are sleeved on the second inner rotor 42, so that when the driving shaft 3 drives the inner rotor 4 to rotate, the second inner rotor 42 simultaneously drives the first outer rotor 51 and the second outer rotor 52 to rotate, the first outer rotor 52 is simultaneously driven by the first inner rotor 41, the two sets of rotors are mutually driven and mutually restricted to rotate, the rotation of the two sets of rotors can keep high synchronization, and the unit oil pumping output capacity of the whole oil pump is the sum of the pumping output capacities of the two sets of rotors because the two sets of rotors can synchronously work.

Further, as shown in fig. 1, since the inner rotor 4 and the outer rotor 5 are relatively thick, when the driving shaft 3 rotates, more oil is stored between the inner rotor 4 and the outer rotor 5, in order to enable the oil to be sucked and discharged in time, an oil suction cavity and an oil discharge cavity may be formed in the pump body 1 and the pump cover 2, the oil inlet communicates with the oil suction cavity of the pump body 1 and the oil suction cavity of the pump cover 2, the oil outlet 7 includes a first oil outlet 71 and a second oil outlet 72, the first oil outlet 71 is located at the upper portion of the pump body 1, the second oil outlet 72 is located on the pump cover 2, the first oil outlet 71 communicates with the oil discharge cavity of the pump body 1, and the second oil outlet 72 communicates with the oil discharge cavity of the pump cover 2.

Install first inner rotor 41 and second inner rotor 42 on driving shaft 3, can adopt simplest interference fit, and first inner rotor 41 and second inner rotor 42 respectively with driving shaft 3 interference fit, this kind of assembly method is fairly simple, but the assembly precision requirement of inner rotor 4 and driving shaft 3 is higher, and technical staff's operation gimmick is accurate, if assembly precision between them is not high enough or first inner rotor 41 and second inner rotor 42 location is inaccurate when manual assembly, can cause the protruding tooth of first inner rotor 41 and second inner rotor 42 to be to inaccurate, influence the pivoted synchronism of two sets of rotors, influence complete machine performance.

Therefore, as shown in fig. 1, the driving shaft 3 is provided with elongated key grooves, the first inner rotor 41 and the second inner rotor 42 are also provided with elongated key grooves, the key grooves of the inner rotors 4 are opposite to the key grooves of the driving shaft 3, and the keys 8 are arranged in the key grooves.

Furthermore, as shown in fig. 2 and 3, a valve chamber communicated with the oil discharge chamber is arranged on the pump cover 2, a pressure limiting valve 9 is arranged in the valve chamber, an oil discharge passage 10 with one end communicated with the valve chamber and the other end communicated with the engine transmission system is arranged on the pump body 1, when the pressure limiting valve 9 is in an open state, redundant oil in the oil discharge chamber of the pump cover 2 flows out of the pressure limiting valve 9, then flows through the oil discharge passage 10, reaches the transmission gear 11 driving the driving shaft 3 to rotate, and further reaches the transmission components such as the driving gear of the engine, and the oil can lubricate the transmission components such as the transmission gear 11 and the driving gear, so that the mechanical wear of the transmission components is reduced, and the service lives of the transmission components are prolonged.

Further, as shown in fig. 3, specifically, the valve chamber is perpendicular to the oil drain passage 10, the pressure limiting valve 9 includes a plunger 91 and a spring 92 transversely disposed in the valve chamber, one end of the spring 92 is located in the plunger 91, the other end is fixed at the lower part of the valve chamber, and the plunger 91 is subjected to the hydraulic pressure of the oil drain chamber and the elastic force of the spring 92. The pressure limiting valve 9 is simple in structure, the elastic coefficient of the spring 92 is preset, when the hydraulic pressure of the oil discharge cavity is larger than the elastic force of the spring 92, the plunger 91 pushes the spring 92 to move rightwards together, the oil discharge cavity is communicated with the oil drainage channel 10, and redundant oil enters the oil drainage channel 10; when the hydraulic pressure of the oil discharge chamber is smaller than the elastic force of the spring 92, the spring 92 rebounds and moves left together with the plunger 91, blocking the inlet of the oil discharge passage 10 and preventing the oil of the oil discharge chamber from flowing into the oil discharge passage 10.

Preferably, the pressure limiting valve 9 further comprises an adjusting bolt 93, a cover plate 94 mounted at the bottom of the valve chamber, and a sealing cover 95 slidably mounted in the valve chamber, one end of the spring 92 is located in the plunger 91, the other end of the spring is fixed on the sealing cover 95, the adjusting bolt 93 penetrates through the cover plate 94 and is in threaded connection with the cover plate 94, the tail end of the adjusting bolt 93 is in contact with the sealing cover 95, and the head end of the adjusting bolt is located outside the cover plate 94 (i.e., the pump cover 2). It should be noted that, in order to facilitate the installation of the plunger 91, the spring 92 and the sealing cover 95 in the valve chamber, the bottom of which should be open before the installation of the pressure-limiting valve 9, the cover plate 94 is designed to: 1. the bottom of the valve chamber can be sealed; 2. the adjustment bolt 93 is easy to install. Since the head end of the adjusting bolt 93 is located outside the pump cover 2, before the oil pump provided by this embodiment leaves a factory, a worker sets the position of the sealing cover 95 in the valve chamber by using the adjusting bolt 93, when the adjusting bolt 93 rotates clockwise, the adjusting bolt 93 pushes the sealing cover 95 to move leftward against the elastic force of the spring 92 against the valve chamber, the spring 92 is compressed, the elastic force of the spring 92 is increased, when the adjusting bolt 93 rotates counterclockwise, the adjusting bolt 93 moves rightward relative to the valve chamber, the sealing cover 95 also moves rightward under the elastic force of the spring 92, and when the adjusting bolt 93 stops rotating, the sealing cover 95 also stops moving, at the same time, the spring 92 stretches, and the elastic force of the spring 92 is reduced, so that it can be seen that the position of the sealing cover 95 is different, the initial elastic force of the spring 92 leaves the factory is also different, but if the pressure limiting valve 9 needs to change the elastic force of the spring 92 when working, the worker can also screw the adjusting bolt 93 on site to solve such problems, and thus, inconvenience caused by disassembling and assembling the pressure limiting valve is avoided.

The above embodiments are preferred implementations of the present invention, and besides, the present invention can be implemented in other ways, and any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Some of the drawings and descriptions of the present invention have been simplified to facilitate the understanding of the improvements over the prior art by those skilled in the art, and some other elements have been omitted from this document for the sake of clarity, and it should be appreciated by those skilled in the art that such omitted elements may also constitute the subject matter of the present invention.

Claims

1. The utility model provides a birotor structure oil pump, includes pump body (1), pump cover (2), driving shaft (3) and is located inner rotor (4) and outer rotor (5) of pump body (1), inner rotor (4) are fixed on driving shaft (3), outer rotor (5) suit is on inner rotor (4), oil inlet (6) and oil-out (7), its characterized in that have been seted up on pump body (1): the inner rotor (4) comprises a first inner rotor (41) and a second inner rotor (42), the end surface of the first inner rotor (41) is tightly attached to the end surface of the second inner rotor (42), and the convex teeth of the first inner rotor and the convex teeth of the second inner rotor are completely aligned; the outer rotor (5) comprises a first outer rotor (51) and a second outer rotor (52), the end face of the first outer rotor (51) is tightly attached to the end face of the second outer rotor (52), and the concave teeth of the first outer rotor and the concave teeth of the second outer rotor are completely aligned; the thickness of the second inner rotor (42) is greater than the thickness of the second outer rotor (52); the sum of the thicknesses of the first inner rotor (41) and the second inner rotor (42) is equal to the sum of the thicknesses of the first outer rotor (51) and the second outer rotor (52).

2. The dual rotor structure oil pump of claim 1, wherein: oil absorption cavity and oil extraction cavity have all been seted up on the pump body (1) and pump cover (2), the oil absorption cavity of the oil inlet intercommunication pump body (1) and the oil absorption cavity of pump cover (2), oil-out (7) include first oil-out (71) and second oil-out (72), the oil extraction cavity of the first oil-out (71) intercommunication pump body (1), the oil extraction cavity of second oil-out (72) intercommunication pump cover (2).

3. The dual rotor structure oil pump of claim 2, wherein: the driving shaft (3) is connected with the first inner rotor (41) and the second inner rotor (42) through a key (8).

4. The dual-rotor structure oil pump according to claim 3, characterized in that: the oil drainage pump is characterized in that a valve chamber communicated with an oil drainage cavity is formed in the pump cover (2), a pressure limiting valve (9) is arranged in the valve chamber, an oil drainage channel (10) with one end communicated with the valve chamber and the other end communicated with an engine transmission system is arranged on the pump body (1), and oil in the oil drainage cavity of the pump cover (2) can enter the oil drainage channel (10) and is drained into the transmission system of an engine when the pressure limiting valve (9) is opened.

5. The dual-rotor structure oil pump of claim 4, characterized in that: the pressure limiting valve (9) comprises a plunger (91) and a spring (92), one end of the spring (92) is located in the plunger (91), the other end of the spring is fixed to the lower portion of the valve chamber, and the plunger (91) is subjected to hydraulic pressure of the oil discharge chamber and elastic force of the spring (92).

6. The dual-rotor structure oil pump according to claim 5, characterized in that: the pressure limiting valve (9) further comprises an adjusting bolt (93), a cover plate (94) installed at the bottom of the valve chamber and a sealing cover (95) installed in the valve chamber in a sliding mode, one end of a spring (92) is located in the plunger (91), the other end of the spring is fixed to the sealing cover (95), the adjusting bolt (93) penetrates through the cover plate (94) and is in threaded connection with the cover plate (94), the tail end of the adjusting bolt (93) is in contact with the sealing cover (95), and the head end of the adjusting bolt is located outside the cover plate (94).