CN114483250A

CN114483250A - Design method of forced lubrication system of reverse triangular rotor engine

Info

Publication number: CN114483250A
Application number: CN202210116499.7A
Authority: CN
Inventors: 王锡斌; 程晨; 谢翔; 李德华
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2022-02-07
Filing date: 2022-02-07
Publication date: 2022-05-13
Anticipated expiration: 2042-02-07
Also published as: CN114483250B

Abstract

The invention discloses a design method of a forced lubrication system of an inverted triangle rotor engine, which is characterized in that an oil hole is formed in an end cover to realize the lubrication of a radial sealing sheet and an end surface sealing sheet; a lubricating oil cavity is established by utilizing the eccentric shaft and the end cover, and an oil duct is arranged on the eccentric shaft, so that the forced lubrication of each bearing on the eccentric shaft is realized. The invention is used for the design of a novel reverse triangle rotor engine forced lubrication system, can realize the reliable lubrication of each friction surface in the novel reverse triangle rotor engine, improves the sealing effect of the engine, reduces air leakage, realizes the reliable lubrication and sealing of the novel rotor engine, reduces the oil consumption and reduces the emission effect of the engine.

Description

Design method of forced lubrication system of reverse-triangular rotor engine

Technical Field

The invention belongs to the field of internal combustion engine design, and relates to a method for designing a forced lubrication system of an inverted triangle rotor engine.

Background

In recent years, electric automobiles have the advantages of relatively few technical barriers, environmental protection, energy conservation, rapid improvement of energy density and safety of batteries, convenience in auxiliary driving and automatic driving and the like, and are rapidly developed to cause great impact on the traditional internal combustion engine automobile industry. On the other hand, the hybrid internal combustion engine automobile has the advantages of convenient refueling, strong cruising ability and no journey anxiety to the electric automobile. However, the traditional internal combustion engine has a complex structure, large volume and weight and low power-weight ratio, so that a hybrid vehicle provided with two sets of power devices has a great vehicle weight, a cabin is difficult to arrange, and the economical efficiency of the whole vehicle is also adversely affected. Therefore, the engine with simple and reliable structure, small weight and volume and high power-to-weight ratio is an urgent need of the hybrid automobile. In addition, small-size portable miniature power station, unmanned aerial vehicle etc. also have great demand to this kind of power device. The novel Inverted-Wankel Engine (Inverted-Wankel Engine) overcomes the sealing problem and the leakage problem of the traditional triangle rotor Engine in the structural principle on the basis of inheriting the simple structure and high power-weight ratio of the traditional triangle rotor Engine, and has strong vitality.

Sealing and lubrication problems are not separable. The radial sealing sheet of the triangular rotor engine is arranged on a rotor, and in order to lubricate the radial sealing sheet, the traditional triangular rotor engine mainly adopts oil mist lubrication, namely lubricating oil is mixed into fuel oil according to a certain proportion and enters the engine along with the fuel oil to lubricate all relative motion surfaces. The lubricating mode is easy to realize, but the lubricating effect is not ideal, and simultaneously, a large amount of lubricating oil is consumed due to combustion, the consumption of the lubricating oil is increased, and a large amount of emission pollution is caused.

Disclosure of Invention

The invention aims to provide a system design method of a forced lubrication system of an inverted-triangular rotor engine, which mainly comprises the steps of lubricating radial and end face sealing sheets, designing a bearing lubrication and oil storage cavity, and forming an oil pump and the like.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a design method of a forced lubrication system of an inverted triangle rotor engine is characterized in that an oil hole is formed in an end cover, so that lubrication of a radial sealing sheet and an end face sealing sheet is realized; a lubricating oil cavity is established by utilizing the eccentric shaft and the end cover, and an oil duct is arranged on the eccentric shaft, so that the forced lubrication of each bearing on the eccentric shaft is realized.

Furthermore, an oil hole is formed in the end face of the air inlet end cover to lubricate the radial sealing sheet.

Furthermore, the oil hole is perpendicular to the end face of the air inlet end cover or the angle formed by the oil hole and the end face of the air inlet end cover is smaller than 90 degrees.

Furthermore, when the oil hole is perpendicular to the end face of the air inlet end cover, oil grooves are formed in the end faces of the air inlet end cover and the exhaust end cover, so that the oil hole is connected with an end face sealing groove in the rotor, and lubrication of an end face sealing sheet is achieved.

Furthermore, an angle formed by the oil hole and the end face of the air inlet end cover is smaller than 90 degrees, a straight hole is formed in the path of the oil hole and leads to the end face sealing groove on the rotor, and lubrication on the end face sealing strip is achieved.

Furthermore, a closed space formed by the eccentric shaft, the air inlet end cover, the exhaust end cover, the oil seal at the end part of the air inlet end cover and the oil seal at the end part of the exhaust end cover is used as an oil storage cavity, a lubricating oil passage is formed in the eccentric shaft, and lubricating oil reaches the lubricating surface of each bearing from the oil storage cavity through the lubricating oil passage to perform forced lubrication on the bearing.

Furthermore, the lubricating oil device also comprises an oil tank, and the oil tank is connected with the lubricating oil channel and the oil storage cavity through an oil pipeline.

Further, an oil pump is arranged between the oil tank and the oil pipeline.

Compared with the prior art, the invention has the beneficial effects that:

the end cover is provided with the oil hole, so that the radial sealing sheet and the end surface sealing sheet are lubricated; a lubricating oil cavity is established by utilizing the eccentric shaft and the end cover, and an oil duct is arranged on the eccentric shaft, so that the forced lubrication of each bearing on the eccentric shaft is realized. The invention can change the lubrication mode of the rotor engine from oil mist lubrication to forced lubrication, improve the lubrication effect of each friction surface, reduce the consumption of lubricating oil and reduce the emission pollution. The invention adopts a simple structure to realize the forced lubrication of the radial sealing sheet and the end surface sealing sheet of the inverted triangle rotor engine, and ensures the reliable lubrication of the friction surfaces and the reliable sealing of the engine. The arrangement of the oil storage cavity ensures the reliable lubrication of all bearings on the eccentric shaft and reduces the consumption of engine oil.

Drawings

FIG. 1 is a mounting layout diagram of radial and end face sealing pieces of an inverted triangle rotor engine according to the invention; wherein, (a) is the installation layout drawing of the engine radial direction sealing piece, and (b) is the installation layout drawing of the end face sealing piece.

FIG. 2 is a layout diagram of a forced lubrication oil path of radial and end sealing sheets of the reverse triangle rotor engine; wherein, (a) is the radial force-feed lubrication oil circuit of the engine, and (b) is the force-feed lubrication oil circuit of the end sealing sheet.

Fig. 3 is a schematic diagram of a forced lubrication scheme of the bearing on the eccentric shaft according to the invention.

Fig. 4 is a schematic diagram of a forced lubrication system of an inverted triangle rotor engine. Wherein, (a) is a multi-oil pipeline, and (b) is a single-oil pipeline.

In the figure, 1 is a radial sealing sheet, 2 is an end face sealing sheet, 3 is a rotor, 4 is a cylinder body, 5 is an air inlet end cover, 6 is an exhaust end cover, 7 is an oil groove, 8 is an oil seal, 9 is an eccentric shaft, 10 is a lubricating oil channel, 11 is an oil pump, and 12 is an oil pipeline.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In order to realize the forced lubrication of each friction surface, the structure characteristics of the inverted-triangle rotor engine and the motion laws of the rotor and the like need to be combined, and the lubrication system of the inverted-triangle rotor engine, including the lubrication of the radial sealing sheet and the end face sealing sheet, the lubrication of the bearing, the design of the oil storage cavity and the like, is designed in a targeted manner.

In the reverse triangle rotor engine, a radial sealing sheet 1 is arranged on a fixed cylinder body and can be arranged through an oil duct to perform forced lubrication on the sealing sheet; for the end face sealing strip, the forced lubrication can also be realized by observing the motion rule of the rotor and the position mutual relation of the rotor and the cylinder body. Thus, the lubricating effect on each friction surface can be improved, the consumption of expensive lubricating oil can be reduced, and the aim of reducing emission can be fulfilled.

According to the design method of the forced lubrication system of the reverse triangular rotor engine, the radial sealing piece 1 and the end face sealing piece 2 are lubricated simultaneously by adopting a high-efficiency and simple design idea according to the structure and the operation characteristics of the reverse triangular rotor engine; a lubricating oil cavity is established by utilizing the eccentric shaft and the end cover, and forced lubrication of bearings on the eccentric shaft is realized by arranging an oil duct on the shaft, and the lubricating oil cavity specifically comprises the following three parts:

1. method for designing surface lubricating system of radial and end face sealing piece

The radial sealing sheet 1 is fixedly arranged on three vertex angles of the cylinder body 4, and the end surface sealing sheet 2 is arranged on the rotor and rotates along with the rotor 3, as shown in (a) and (b) of figure 1. In order to lubricate the radial sealing sheet 1, an oil duct radial sealing groove is processed from the side surface of the cylinder body 4, so that the radial sealing sheet 1 can be sealed. This method, however, cannot simultaneously lubricate the end seal 2. The invention adopts the way that the end surface is provided with an oil hole to lubricate the radial sealing sheet 1, and the oil hole can be vertical to the end surface of the air inlet end cover 5 or form a certain angle with the end surface. If the oil hole is perpendicular to the end cover, oil grooves 7 may be formed in the end faces of the intake end cover 5 and the exhaust end cover 6, so that the oil hole is connected to the end face seal groove on the rotor, and the end face seal piece 2 is lubricated at the same time, as shown in fig. 2 (a). If the angle between the oil hole and the end face of the air inlet end cover 5 is less than 90 degrees, namely an inclined hole is adopted, a straight hole can be formed on the path of the inclined hole to lead to the end face sealing groove, and lubrication on the end face sealing strip 2 is realized, as shown in (b) in fig. 2.

The structure and operation of the reverse triangle rotor engine have the following characteristics: 1) the radial sealing pieces 1 are arranged at three vertex angles of the cylinder body, and the radial sealing pieces 1 are fixed when the rotor moves; 2) the contact surface of the radial sealing sheet 1 and the rotor is generally designed to be an arc surface so as to ensure reliable contact sealing; 3) the end face sealing sheets 2 are arranged on two end faces of the rotor, generally keep a small fixed distance with the edge of the rotor and do not move relative to the rotor; 4) the rotor is kept in contact with the three radial sealing pieces 1 at any time. According to the above 1), 2), a lubricating oil hole can be provided from the end face, so that lubricating oil enters into the gap between the radial sealing piece 1 and the radial surface of the rotor for lubrication. According to the above 3) and 4), it can be seen that a certain radial lubrication oil hole is provided at the front and is located at a short distance from the lubrication surface of the rotor end-face seal piece 2 at the apex, and therefore, forced lubrication of the radial seal piece 1 and the end-face seal piece 2 can be achieved by extending the oil hole or providing an additional oil hole in the end cover.

2. Bearing lubrication system design method

The bearing of the eccentric shaft of the reverse triangle rotor engine determines the bearing type of the eccentric shaft according to the load and the rotating speed of the engine. For general designs (spark-ignited engines), rolling bearings can be used to simplify the engine design; if the engine load is large, such as a compression ignition engine design, a sliding bearing design can be adopted. Regardless of the type of bearing, the bearings of the eccentric shaft 9 need to be lubricated in order to ensure reliable operation of the engine.

Because the three combustion chambers corresponding to each rotor of the inverted triangle rotor engine fully occupy the periphery of the rotor 4, and no space is provided with an oil sump, the invention takes a closed space formed by the eccentric shaft 9, the air inlet end cover 5, the air outlet end cover 6, the oil seal 8 at the end part of the air inlet end cover 5 and the oil seal 8 at the end part of the air outlet end cover 6 as an oil storage cavity, a lubricating oil passage 10 is arranged on the eccentric shaft 9, and lubricating oil reaches the lubricating surface of each bearing from the oil storage cavity through the lubricating oil passage 10 to carry out forced lubrication on the bearing, which is shown in figure 3.

3. Oil pump and external pipeline design method

Referring to fig. 4, an external oil pump 11 (electrically driven or mechanically connected to the eccentric shaft 9 of the engine) is used for sucking oil from an external oil tank and pressurizing, and is connected to a sealing sheet lubricating oil passage 10 interface and an oil storage cavity external interface through a plurality of oil pipelines 12.

The invention is used for the design of a novel reverse triangular rotor engine forced lubrication system, can realize the reliable lubrication of each friction surface in the novel reverse triangular rotor engine, improves the sealing effect of the engine, reduces air leakage, realizes the reliable lubrication and sealing of the novel reverse triangular rotor engine, reduces the oil consumption and reduces the effect of engine emission.

The foregoing is merely illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. But all changes which come within the scope of the invention are intended to be embraced therein.

Unless defined otherwise, 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 invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Claims

1. A design method of a forced lubrication system of an inverted-triangular rotor engine is characterized in that lubrication of a radial sealing sheet (1) and an end face sealing sheet (2) is realized by arranging an oil hole on an end cover; a lubricating oil cavity is established by utilizing the eccentric shaft and the end cover, and an oil duct is arranged on the eccentric shaft, so that the forced lubrication of each bearing on the eccentric shaft is realized.

2. The method for designing the forced lubrication system of the inverted-triangular rotor engine according to claim 1, characterized in that an oil hole is formed in the end face of the air inlet end cover (5) to lubricate the radial seal piece (1).

3. The method for designing the forced lubrication system of the inverted-triangular rotor engine according to claim 2, characterized in that the oil hole is perpendicular to the end face of the air inlet end cover (5) or the angle formed by the oil hole and the end face of the air inlet end cover (5) is less than 90 degrees.

4. The design method of the forced lubrication system of the inverted-triangular rotor engine according to claim 1, characterized in that when the oil hole is perpendicular to the end face of the intake end cover (5), oil grooves (7) are formed in the end faces of the intake end cover (5) and the exhaust end cover (6), so that the oil hole is connected with the end face seal groove on the rotor (4) to lubricate the end face seal piece (2).

5. The design method of the forced lubricating system of the inverted-triangular rotor engine is characterized in that an angle formed by an oil hole and the end face of the air inlet end cover (5) is less than 90 degrees, a straight hole is formed in the path of the oil hole and leads to an end face sealing groove on the rotor (4), and lubrication of the end face sealing strip (2) is achieved.

6. The design method of the forced lubrication system of the inverted-triangular rotor engine is characterized in that a closed space formed by the eccentric shaft (9), the air inlet end cover (5), the air outlet end cover (6), the oil seal (8) at the end part of the air inlet end cover (5) and the oil seal (8) at the end part of the air outlet end cover (6) is used as an oil storage cavity, a lubricating oil channel (10) is formed in the eccentric shaft (9), and lubricating oil reaches the lubricating surface of each bearing from the oil storage cavity through the lubricating oil channel (10) to perform forced lubrication on the bearing.

7. The method for designing a forced lubrication system of an inverted triangular rotor engine according to claim 6, further comprising a sump, wherein the sump is connected with the lubricating oil passage (10) and the oil reservoir chamber through a sump pipe (12).

8. A method according to claim 7, characterized in that an oil pump (11) is arranged between the oil tank and the oil pipe (12).