CN114278409A

CN114278409A - Crankshaft front end engine oil pressurizing structure and engine

Info

Publication number: CN114278409A
Application number: CN202111657854.3A
Authority: CN
Inventors: 焦明裕; 李成艳; 乔芳; 王经
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-04-05
Anticipated expiration: 2041-12-31
Also published as: CN114278409B

Abstract

The invention discloses a crankshaft front end engine oil pressurizing structure and an engine, wherein the structure comprises: the crankshaft comprises a shaft body and a main journal oil duct arranged on the shaft body, wherein the main journal oil duct comprises a first oil duct, a second oil duct, a third oil duct and a fourth oil duct; the first oil duct extends along the axis direction of the shaft body, the second oil duct, the third oil duct and the fourth oil duct penetrate through the shaft body along the direction perpendicular to the first oil duct and are communicated with the first oil duct, the second oil duct is communicated with an oil inlet of the first oil duct, the third oil duct is positioned between the oil inlet of the first oil duct and an oil outlet of the first oil duct, and the fourth oil duct is positioned between the third oil duct and the oil outlet of the first oil duct; the blockage blocks the first oil duct between the third oil duct and the fourth oil duct; and the booster pump takes the shaft body as a transmission shaft of the booster pump, an oil inlet cavity of the booster pump is communicated with the end part of the third oil duct in a sealing way, and an oil outlet cavity of the booster pump is communicated with the end part of the fourth oil duct in a sealing way. The structure can improve the use efficiency of high-pressure oil.

Description

Crankshaft front end engine oil pressurizing structure and engine

Technical Field

The invention relates to the technical field of engines, in particular to a crankshaft front end engine oil pressurizing structure and an engine.

Background

At present, the oil supply type plate spring shock absorber is widely applied to a diesel engine, and the torsional vibration energy of a shafting is absorbed and the stress of a crankshaft is reduced by increasing damping so as to achieve the purpose of protecting the crankshaft. The plate spring shock absorber needs external oil supply to generate damping and take away heat, and for the plate spring shock absorber which needs higher oil supply pressure to generate damping, the oil supply mode mainly adopts two modes of crankshaft direct supply and external pressurization oil supply.

As shown in fig. 1, a structural schematic diagram of the plate spring damper for directly supplying oil through a crankshaft is shown, the pressure of a main oil passage is firstly increased, the pressure oil of the main oil passage directly enters a plate spring damper 104 through a machine body 101, a bearing bush 102 and the crankshaft 103, and a pressurizing link is not arranged in the middle. In addition, in the process of increasing the pressure of the main oil gallery, the problems of increased flow of the oil pump, failure of a control valve, increased leakage, difficulty in sealing and the like are brought, so that the risk of the whole lubricating system is increased.

As shown in fig. 2, which is a schematic structural diagram of the plate spring damper through external pressurization oil supply, after pressure oil in a main oil gallery is pressurized by an external pressurization pump, the pressure oil sequentially enters a front end cover 201 and a bushing 202, and finally enters a plate spring damper 203. Because the high-pressure oil flows through the bushing after being pressurized and is finally conveyed to the shock absorber, the high-pressure oil at the clearance of the bushing is seriously leaked, and the utilization efficiency of the pressurized high-pressure oil is low. And because the outer ring of the bush is in interference fit and the inner ring has small clearance, the assembly difficulty is high and the reliability is poor.

Disclosure of Invention

The invention provides a crankshaft front end engine oil supercharging structure and an engine, wherein the crankshaft front end engine oil supercharging structure can reduce the loss of oil transportation pressure drop, improve the use efficiency of high-pressure oil, ensure the reliability of the whole lubricating system, and has simple combined parts and high assembly performance.

In order to achieve the purpose, the invention provides the following technical scheme:

a crankshaft front end engine oil pressure increasing structure comprising:

the crankshaft comprises a shaft body and a main journal oil passage arranged on the shaft body, wherein the main journal oil passage comprises a first oil passage, a second oil passage, a third oil passage and a fourth oil passage; the first oil duct extends along the axis direction of the shaft body, an oil outlet of the first oil duct is located at the front end of the shaft body, the second oil duct, the third oil duct and the fourth oil duct penetrate through the shaft body along the direction perpendicular to the first oil duct, the second oil duct is communicated with an oil inlet of the first oil duct, the end portion of the second oil duct is communicated with a main oil duct of the machine body, the third oil duct is located between the oil inlet of the first oil duct and the oil outlet of the first oil duct and is communicated with the first oil duct, and the fourth oil duct is located between the third oil duct and the oil outlet of the first oil duct and is communicated with the first oil duct;

a plug located in the first oil passage between the third oil passage and the fourth oil passage for not communicating the first oil passage between the third oil passage and the fourth oil passage;

the booster pump, the booster pump cover in on the axis body with the axis body is its self transmission shaft for inhale main journal oil duct and pressurization with machine oil, the oil inlet chamber of booster pump with the end seal intercommunication of third oil duct, the oil outlet chamber of booster pump with the end seal intercommunication of fourth oil duct.

Optionally, the booster pump comprises a housing and an outer rotor and an inner rotor located inside the housing;

the inner rotor is arranged on the shaft body and located between the third oil duct and the fourth oil duct, inner teeth are arranged on the outer side of the inner rotor, the outer rotor is located on the outer side of the inner rotor, outer teeth are arranged on the inner side of the outer rotor, the number of the outer teeth is more than that of the inner teeth, and the outer teeth can be partially meshed with the inner teeth; the axial lead of the inner rotor is not coincident with the axial lead of the outer rotor, the inner rotor can eccentrically rotate relative to the outer rotor under the drive of the shaft body, and the outer rotor can rotate at a differential speed under the drive of the inner rotor;

the first end of the shell is hermetically connected with the part of the shaft body, which is positioned between the second oil duct and the third oil duct, and an oil inlet cavity is formed between the first end of the shell and the inner rotor and the outer rotor; the second end of the shell is in sealing connection with the shaft body at a part between the fourth oil duct and the oil outlet of the first oil duct, and an oil outlet cavity is formed between the second end of the shell and the inner rotor and the outer rotor.

Optionally, the first end of the housing is connected to the shaft through a front oil seal, and the second end of the housing is connected to the shaft through a rear oil seal.

Optionally, the matching section of the shaft body and the inner rotor is in a hexagonal structure.

Optionally, a center line of the first oil passage coincides with a shaft axis of the shaft body.

Optionally, the second oil passage, the third oil passage and the third oil passage are arranged in parallel with each other.

The invention also provides an engine, which comprises any one crankshaft front end engine oil pressurizing structure provided by the technical scheme, a machine body and a part to be supplied with oil;

the machine body is connected with the shaft body through a bearing bush, a main oil way for supplying oil is arranged on the machine body, and the main oil way is communicated with the end part of the second oil duct through the bearing bush;

the oil supply part to be supplied is connected with the front end of the shaft body, and the oil duct on the oil supply part to be supplied is communicated with the oil outlet of the first oil duct.

Optionally, the oil-to-be-supplied member is a leaf spring damper.

Optionally, the booster pump further comprises a gear which is arranged on the shaft body in an interference fit manner, and the gear is located between the booster pump and the bearing bush.

The invention has the beneficial effects that:

the embodiment of the invention provides a crankshaft front end engine oil pressure increasing structure and an engine, comprises a crankshaft, a plug and a booster pump, wherein the crankshaft comprises a shaft body and a main journal oil passage arranged on the shaft body, engine oil can enter a second oil passage of the main journal oil passage from the main oil passage of the machine body and then flow into a first oil passage from the second oil passage, because of the blockage of the first oil duct, the engine oil flows into the third oil duct from the first oil duct and then flows into the oil inlet cavity of the booster pump from the third flow passage, the booster pump pressurizes the inflowing engine oil to form high-pressure engine oil, the pressurized engine oil enters the fourth oil duct from the oil outlet cavity of the booster pump, in flowing into first oil duct by the fourth oil duct, under the blockking that blocks up in first oil duct, guarantee high, low pressure machine oil and cut off, high-pressure machine oil flows out from the oil-out of first oil duct, and then realizes the pressurization and the transmission to machine oil. The front end of the crankshaft front end oil supercharging mechanism can be connected with a part to be supplied with oil, the engine oil is sucked into a main journal oil duct on the crankshaft body through the supercharging pump and is supercharged, because the oil inlet cavity of the supercharging pump is communicated with the end part of a third oil duct on the crankshaft body in a sealing way and the oil outlet cavity of the supercharging pump is communicated with the end part of a fourth oil duct on the crankshaft body in a sealing way, the supercharging at the oil delivery tail end can be directly realized, the engine oil does not leak after the supercharging, the high-pressure oil directly enters the part to be supplied with oil, the pressure drop loss of the delivered oil can be reduced, the use efficiency of the high-pressure oil is improved, and compared with the prior art, the pressure of the main oil duct and the flow of the engine oil do not need to be improved, the engine body and other engine oil accessories such as a filter, a control valve and the like do not need to operate under high pressure, the risks of leakage, the sealing difficulty and the like can be reduced, and the reliability of the whole lubricating system can be ensured, the combined parts are simple and the assembly performance is high.

Drawings

FIG. 1 is a schematic view of a prior art leaf spring damper with direct oil supply from a crankshaft;

FIG. 2 is a schematic structural view of a prior art leaf spring damper supplied with oil by external pressurization;

FIG. 3 is a schematic structural diagram of a crankshaft front end supercharging structure according to an embodiment of the present invention;

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

fig. 5 is a schematic structural diagram of an engine according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 3, the present invention provides a crankshaft front end engine oil pressure increasing structure, including:

the crankshaft comprises a shaft body 01 and a main journal oil passage arranged on the shaft body 01, wherein the main journal oil passage comprises a first oil passage L1, a second oil passage L2, a third oil passage L3 and a fourth oil passage L4; first oil duct L1 extends along the axial lead direction of shaft body 01, the oil outlet of first oil duct L1 is located at the front end of shaft body 01, second oil duct L2, third oil duct L3 and fourth oil duct L4 all penetrate shaft body 01 along the direction perpendicular to first oil duct L1, second oil duct L2 is communicated with the oil inlet of first oil duct L1, the end of second oil duct L2 is communicated with the main oil duct of the machine body, third oil duct L3 is located between the oil inlet of first oil duct L1 and the oil outlet of first oil duct L1 and is communicated with first oil duct L1, and fourth oil duct L4 is located between third oil duct L3 and the oil outlet of first oil duct L1 and is communicated with first oil duct L1;

a plug 02, the plug 02 being located in the first oil passage L1 between the third oil passage L3 and the fourth oil passage L4 for not communicating the first oil passage L1 between the third oil passage L3 and the fourth oil passage L4;

the oil inlet cavity A of the booster pump 03 is communicated with the end part of the third oil duct L3 in a sealing mode, and the oil outlet cavity B of the booster pump 03 is communicated with the end part of the fourth oil duct L4 in a sealing mode.

The crankshaft front end oil supercharging mechanism provided by the embodiment of the invention comprises a crankshaft, a plug 02 and a supercharging pump 03, wherein the crankshaft comprises a shaft body 01 and a main journal oil passage arranged on the shaft body 01, engine oil can enter a second oil passage L2 of the main journal oil passage from a main oil passage of a machine body and then flows into a first oil passage L1 from a second oil passage L2, because of the blockage 02 in the first oil passage L1, the engine oil flows into the third oil passage L3 from the first oil passage L1 and then flows into the oil inlet chamber A of the booster pump 03 from the third flow passage, the booster pump 03 pressurizes the inflowing engine oil to form high-pressure engine oil, the pressurized engine oil enters the fourth oil passage L4 from the oil outlet chamber B of the booster pump 03, when the oil flows into the first oil passage L1 from the fourth oil passage L4 and is blocked by the plug 02 in the first oil passage L1, the high-pressure oil and the low-pressure oil are separated, and the high-pressure oil flows out from the oil outlet of the first oil passage L1, so that the oil is pressurized and transmitted. In the crankshaft front end oil supercharging mechanism, the front end of the crankshaft body 01 can be connected with a component to be supplied with oil, the engine oil is sucked into a main journal oil passage on the crankshaft body 01 through the booster pump 03 and is supercharged, because the oil inlet cavity A of the booster pump 03 is communicated with the end part of the third oil passage L3 on the crankshaft body 01 in a sealing manner and the oil outlet cavity B of the booster pump 03 is communicated with the end part of the fourth oil passage L4 on the crankshaft body 01 in a sealing manner, the supercharging at the tail end of oil transportation can be directly realized, the engine oil does not leak after being supercharged, the high-pressure oil directly enters the component to be supplied with oil, the loss of the pressure drop of the oil transportation can be reduced, the use efficiency of the high-pressure oil is improved, and compared with the prior art, the pressure of a main oil passage and the flow rate of the engine oil pumping do not need to be increased, the engine body and other engine oil accessories such as a filter, a control valve and the like do not need to operate at high pressure, the risks of leakage, the sealing difficulty and the like can be reduced, the reliability of the whole lubricating system is ensured, the combined parts are simple, and the assembly performance is high.

In one specific embodiment, the booster pump 03 may be a rotor pump, as shown in fig. 3 and 4, the booster pump 03 specifically includes a housing 031 and an outer rotor 032 and an inner rotor 033 located inside the housing 031; the inner rotor 033 is mounted on the shaft body 01 and located between the third oil channel L3 and the fourth oil channel L4, inner teeth 0331 are arranged on the outer side of the inner rotor 033, the outer rotor 032 is located on the outer side of the inner rotor 033, outer teeth 0321 are arranged on the inner side of the outer rotor 032, the number of the outer teeth 0321 is larger than that of the inner teeth 0331, and the outer teeth 0321 and the inner teeth 0331 can be partially meshed; the axial lead of the inner rotor 033 is not coincident with the axial lead of the outer rotor, the inner rotor 033 can eccentrically rotate relative to the outer rotor 032 under the drive of the shaft body 01, and the outer rotor 032 can be driven by the inner rotor 033 to rotate at a differential speed; a first end of the housing 031 is hermetically connected with a portion of the shaft body 01, which is located between the second oil passage L2 and the third oil passage L3, and an oil inlet chamber a is formed between the first end of the housing 031 and the inner rotor 033 and the outer rotor 032; the second end of the housing 031 is in sealed connection with the shaft body 01 at a portion between the fourth oil passage L4 and the oil outlet of the first oil passage L1, and an oil outlet chamber B is formed between the second end of the housing 031 and the inner rotor 033 and the outer rotor 032.

In the above-mentioned booster pump 03, because the external teeth 0321 on the external rotor 032 and the internal teeth 0331 on the internal rotor 033 are partially engaged, the axial lead of the external rotor 032 does not coincide with the axial lead of the internal rotor 033, the internal rotor 033 is driven by the crankshaft to perform eccentric motion relative to the external rotor 032, and the external rotor 032 can be driven by the internal rotor 033 to rotate at a differential speed. For example, as shown in fig. 4, in the upper half area, the volume formed by the inner teeth 0331 and the outer teeth 0321 gradually increases with the rotation direction of the inner rotor 033 while the inner rotor 033 rotates clockwise with the crankshaft, forming a vacuum oil suction chamber C. Along with the rotation of the inner rotor 033, the engine oil flows into the lower half portion, the volume formed by the inner teeth 0331 and the outer teeth 0321 is gradually reduced along with the rotation direction of the inner rotor 033 to form an oil pressing cavity D, the inner rotor 033 and the outer rotor 032 are matched with the compressor oil to form high-pressure oil, and the high-pressure oil flows into an oil outlet cavity B of the booster pump 03. The booster pump 03 can adjust the flow rate and pressure of engine oil by adjusting the inner rotor 033 and the outer rotor 032.

In a specific embodiment, as shown in fig. 3, a first end of the housing 031 may be hermetically connected to the shaft body 01 through a front oil seal 041, and a second end of the housing 031 may be hermetically connected to the shaft body 01 through a rear oil seal 042, so that oil leakage during transmission can be avoided.

In a specific embodiment, the matching section of the shaft body 01 and the inner rotor 033 may be a hexagonal structure, so as to ensure that the crankshaft shaft body 01 drives the inner rotor 033 to rotate.

In the above main journal oil passage, as shown in fig. 3, the center line of the first oil passage L1 and the axis of the shaft body 01 may coincide with each other, so that the structural design of the main journal oil passage may be optimized, and the first oil passage L1, the second oil passage L2, the third oil passage L3, and the fourth oil passage L4 may be conveniently manufactured.

In addition, as shown in fig. 3, the second oil passage L2, the third oil passage L3, and the third oil passage L3 may be arranged in parallel to each other, so that the structural design of the main journal oil passage can be optimized, and the manufacturing is convenient.

An embodiment of the present invention further provides an engine, as shown in fig. 5, including any one of the crankshaft front end engine oil pressurizing structures provided in the foregoing technical solutions, further including an engine body 05 and a component 07 to be supplied with oil; the engine body 05 can be connected with the shaft body 01 through a bearing bush 06, a main oil path for supplying oil is arranged on the engine body 05, and the main oil path is communicated with the end part of the second oil passage L2 through the bearing bush 06; the oil-to-be-supplied member 07 may be connected to the front end of the shaft body 01, and the oil passage 071 of the oil-to-be-supplied member 07 communicates with an oil outlet of the first oil passage L1.

In the engine provided by the embodiment of the invention, the engine comprises the crankshaft front end engine oil pressurizing structure, the engine body 05 and the part to be supplied with oil 07, except that a small amount of leakage exists when the engine oil flows through the bearing bush 06, the engine oil is sucked into the main journal oil passage on the crankshaft body 01 through the booster pump 03 and is pressurized, because the oil inlet cavity A of the booster pump 03 is hermetically communicated with the end part of the third oil passage L3 on the crankshaft body 01 and the oil outlet cavity B of the booster pump 03 is hermetically communicated with the end part of the fourth oil passage L4 on the crankshaft body 01, the pressurization at the oil conveying tail end can be directly realized, and the leakage of the engine oil is avoided after the pressurization, so that the high-pressure oil directly enters the part to be supplied with oil, the oil conveying pressure drop loss can be reduced, the use efficiency of the high-pressure oil is improved, and compared with the prior art, the pressure of the main oil passage 051 and the pump flow are not required to be increased, and the engine body 05 and other engine oil accessories such as a filter, The control valve and the like do not need high-pressure operation, the risks of leakage, difficult sealing and the like can be reduced, the reliability of the whole lubricating system is ensured, the combined components are simple, and the assembly performance is high.

The oil supply part 07 can be a plate spring absorber, high-pressure engine oil pressurized by the engine oil pressurizing structure at the front end of the crankshaft can directly enter the plate spring absorber, and external high-pressure oil enters a gap between reeds of the absorber, so that the reeds can rotate mutually between the inner ring and the outer ring and generate damping when the reeds are extruded, the effect of absorbing torsional vibration energy is achieved, and heat is taken away. Optionally, the oil supply unit 07 may also be another device, and in practical application, the oil pressurizing structure at the front end of the crankshaft is suitable for a unit that needs a larger oil supply pressure or a local pressurizing at the front end of the crankshaft, so that the structure of the oil supply unit 07 may be set according to practical situations, and is not limited herein.

The engine provided by the embodiment of the invention may further include a gear 08 that is mounted on the shaft body 01 in an interference manner, wherein the gear 08 is located between the booster pump 03 and the bearing bush 06, and the gear 08 enables the front end of the crankshaft body 01 to be in transmission connection with other components.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. The utility model provides a bent axle front end machine oil pressure boost structure which characterized in that includes:

the crankshaft comprises a shaft body and a main journal oil passage arranged on the shaft body, wherein the main journal oil passage comprises a first oil passage, a second oil passage, a third oil passage and a fourth oil passage; the first oil duct extends along the axis direction of the shaft body, an oil outlet of the first oil duct is located at the front end of the shaft body, the second oil duct, the third oil duct and the fourth oil duct penetrate through the shaft body along the direction perpendicular to the first oil duct, the second oil duct is communicated with an oil inlet of the first oil duct, the third oil duct is located between an oil inlet of the first oil duct and an oil outlet of the first oil duct and is communicated with the first oil duct, and the fourth oil duct is located between the third oil duct and the oil outlet of the first oil duct and is communicated with the first oil duct;

the booster pump, the booster pump cover in on the axis body with the axis body is its self transmission shaft for inhale engine oil main journal oil duct and pressurization, the oil inlet chamber of booster pump with the end seal intercommunication of third oil duct, the oil outlet chamber of booster pump with the end seal intercommunication of fourth oil duct.

2. The crankshaft front end oil boosting structure according to claim 1, wherein the booster pump includes a housing, and an outer rotor and an inner rotor inside the housing;

3. The crankshaft front end oil pressurizing structure according to claim 2, wherein the first end of the housing is hermetically connected with the shaft body through a front oil seal, and the second end of the housing is hermetically connected with the shaft body through a rear oil seal.

4. The crankshaft front end oil pressure increasing structure according to claim 2, wherein a fitting section of the shaft body and the inner rotor is a hexagonal structure.

5. The crankshaft front end oil pressurizing structure according to any one of claims 1 to 4, wherein a center line of the first oil passage coincides with a shaft axis of the shaft body.

6. The crankshaft front end oil pressurizing structure according to any one of claims 1 to 4, wherein the second oil passage, the third oil passage, and the third oil passage are arranged in parallel with each other.

7. An engine comprising the crankshaft front end oil pressurizing structure according to any one of claims 1 to 6, further comprising a body and a member to be oil-supplied;

8. The engine of claim 7, wherein the oil-to-be-supplied component is a leaf spring damper.

9. An engine according to claim 7 or 8, further comprising a gear interference mounted on the shaft, the gear being located between the booster pump and the bearing shells.