CN111457080A

CN111457080A - Gear train arrangement of diesel engine gear train cooling and lubricating system

Info

Publication number: CN111457080A
Application number: CN202010380282.8A
Authority: CN
Inventors: 黄永仲; 王利乐; 李伟; 胡忠义
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Marine and Genset Power Co Ltd
Priority date: 2020-05-08
Filing date: 2020-05-08
Publication date: 2020-07-28

Abstract

The invention discloses a gear train arrangement of a diesel engine gear train cooling and lubricating system. The oil injection gear is arranged above the first gear and meshed with the first gear, and a plurality of oil injection holes are formed in the oil injection gear; the oil injection gear is sleeved on the gear shaft, an oil conveying passage is arranged in the gear shaft, and the oil conveying passage is communicated with a main oil passage arranged on the shell; the oil spraying holes are communicated with the oil conveying passage, and when the oil spraying gear rotates, the oil spraying holes can spray oil beams around for lubricating the gears. The gear train arrangement of the invention injects lubricating oil to the gear train through the oil injection gear to enhance cooling and lubricating of the gear train.

Description

Gear train arrangement of diesel engine gear train cooling and lubricating system

Technical Field

The invention relates to the field of cooling and lubricating of a diesel engine gear train, in particular to a gear train arrangement of a cooling and lubricating system of the diesel engine gear train.

Background

International engines, including diesel engines, gasoline engines, and other types of internal combustion engines, are now increasing their power density. With the increase of the power density of the engine, the mechanical load of each part of the engine is gradually increased, and the torque transmitted by the gear system of the engine in the working process is larger and larger. When the two gears rotate relatively, the gear tooth surfaces mainly bear rolling friction and sliding friction, a large amount of heat is generated by the friction of the part, and if the part of heat cannot be transmitted out in time, the surface temperature of the gear is reduced, and the tensile strength, the yield strength and the fatigue limit of the metal material of the tooth surfaces are obviously reduced. When the transmitted force is greater than the load bearing capacity of the metal, spalling of the metal material will occur, causing damage to the part. As the power and load of the diesel engine gradually increase, the failure of the gear train of the diesel engine also gradually increases.

As shown in fig. 1, the gear train of the diesel engine of the prior art mainly includes a first gear 1 disposed at a crankshaft end, a second gear 2 and a ninth gear 9 located at left and right sides of the first gear 1 and engaged with the first gear 1, a third gear 3 and a fourth gear 4 located at left side of the second gear 2 and engaged with the second gear 2, a seventh gear 7 and an eighth gear 8 located at right side of the ninth gear 9 and engaged with the ninth gear 9, a fifth gear 5 located at rear of the second gear 2 and engaged with a rear gear of the second gear 2, and a sixth gear 6 located at rear of the ninth gear 9 and engaged with a rear gear of the ninth gear 9. In a common gear train arrangement mode, gears are mainly lubricated by splashes generated by striking lubricating oil by crank throws of a crankshaft, but because the crank throws and the gears are axially distributed in different planes along the crankshaft, the

gears

4, 5, 6 and 7 which are positioned far away from the crankshaft are difficult to obtain sufficient lubricating oil for cooling and lubricating, and the probability of faults is high. The conventional solution is to solve such failures by increasing the grade of gear material or increasing the gear module and the tooth width. However, the gear module and the tooth width are increased, and the whole gear train needs to be changed, so that the change is large, and the realization is difficult. And increasing the grade of the material is usually limited by purchasing, processing, cost and the like of the material, and is difficult to realize. Especially when the material has been upgraded to a higher grade, it is often not feasible to continue upgrading the material.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

The invention aims to provide a gear train arrangement of a diesel engine gear train cooling and lubricating system, which can inject lubricating oil to a gear train through an oil injection gear so as to enhance cooling and lubricating of the gear train.

In order to achieve the above object, the present invention provides a gear train arrangement of a cooling and lubricating system of a diesel engine gear train, the diesel engine gear train comprises a plurality of gears, the plurality of gears comprises a first gear arranged at an end of a crankshaft, and the gear train arrangement comprises an oil injection gear and a gear shaft. The oil injection gear is arranged above the first gear and meshed with the first gear, and a plurality of oil injection holes are formed in the oil injection gear; the oil injection gear is sleeved on the gear shaft, an oil conveying passage is arranged in the gear shaft, and the oil conveying passage is communicated with a main oil passage arranged on the shell; the oil spraying holes are communicated with the oil conveying passage, and when the oil spraying gear rotates, the oil spraying holes can spray oil beams around for lubricating the gears.

In a preferred embodiment, the gear shaft includes a plurality of annular oil grooves and a plurality of oil spray passages. A plurality of annular oil grooves are annularly arranged on the gear shaft in parallel; the plurality of oil spraying channels are arranged along the radial direction of the gear shaft, one end of each oil spraying channel is communicated with the oil conveying channel, and the other end of each oil spraying channel is communicated with the annular oil groove.

In a preferred embodiment, a plurality of oil injection holes of the oil injection gear extend from the tooth surface to the gear hole in a radial direction, and the positions of the plurality of oil injection holes in the gear hole correspond to the plurality of annular oil grooves of the gear shaft.

In a preferred embodiment, the gear train arrangement of the gear train cooling and lubricating system of the diesel engine further comprises a thrust plate which is arranged at the end part of the gear shaft and is positioned outside the oil injection gear, and the thrust plate is used for positioning the oil injection gear and preventing the oil injection gear from falling off the gear shaft.

In a preferred embodiment, the gear shaft further comprises a plurality of mounting holes for fixing the gear shaft to the housing by means of bolts.

Compared with the prior art, the gear train arrangement of the diesel engine gear train cooling and lubricating system has the following beneficial effects: the oil injection gear is arranged at the upper part of the first gear, and lubricating oil beams are periodically and outwards injected in the rotating process of the oil injection gear, so that a plurality of gears far away from the first gear can obtain enough lubricating oil, the lubrication and cooling of a gear train are effectively increased, the working environment of the gears is improved, and the failure rate of the gears is reduced.

Drawings

FIG. 1 is a schematic front view of a gear train arrangement according to one embodiment of the prior art;

FIG. 2 is a schematic front view of a gear train arrangement according to an embodiment of the invention;

FIG. 3 is a schematic top view of a gear train arrangement according to an embodiment of the invention;

FIG. 4 is a partial enlarged view of an oil passage of a gear train arrangement according to an embodiment of the present invention;

fig. 5 is an enlarged view of fig. 3 from a.

Description of the main reference numerals:

1-a first gear, 2-a second gear, 3-a third gear, 4-a fourth gear, 5-a fifth gear, 6-a sixth gear, 7-a seventh gear, 8-an eighth gear, 9-a ninth gear, 10-an oil injection gear, 101-an oil injection hole, 11-a gear shaft, 111-an oil conveying channel, 1111-an oil injection channel, 1112-an annular oil groove, 112-a mounting hole, 12-a shell, 121-a main oil channel and 13-a thrust plate.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As shown in fig. 2 to 4, a gear train arrangement of a diesel engine gear train cooling and lubricating system according to a preferred embodiment of the present invention includes a first gear 1 provided at a crankshaft end, second and

ninth gears

2 and 9 located right and left of the first gear 1 and engaged therewith, third and

fourth gears

3 and 4 located at a left side of the second gear 2 and engaged therewith, seventh and

eighth gears

7 and 8 located at a right side of the ninth gear 9 and engaged therewith, a fifth gear 5 located at a rear of the second gear 2 and engaged with a rear gear of the second gear 2, and a sixth gear 6 located at a rear of the ninth gear 9 and engaged with a rear gear of the ninth gear 9. The gear train arrangement comprises an oil injection gear 10 and a gear shaft 11.

As shown in fig. 3 to 5, in the present embodiment, the gear shaft 11 is fixed to the gear train case 12 by bolts through a plurality of mounting holes 112 provided at the root of the gear shaft 11. The housing 12 is provided with a main oil gallery 121, and the main oil gallery 121 is communicated with a lubricating system of the diesel engine. The gear shaft 11 has an oil delivery passage 111 formed therein in an axial direction, and the oil delivery passage 111 communicates with a main oil passage 121 formed in the housing 12. The gear shaft 11 surface includes a plurality of annular oil grooves 1112 and a plurality of oil spray channels 1111. A plurality of annular oil grooves 1112 are annularly arranged on the gear shaft 11 in parallel. The plurality of oil spray channels 1111 are arranged along the radial direction of the gear shaft 11, and one end of each oil spray channel 1111 is communicated with the oil delivery channel 111, and the other end is communicated with the annular oil groove 1112.

As shown in fig. 3 to 5, in the present embodiment, the oil injection gear 10 is disposed on the gear shaft 11 above the first gear 1 and is engaged with the first gear 1. The oil injection gear 10 rotates around a gear shaft 11, and the oil injection gear 10 is provided with a plurality of oil injection holes 101. The plurality of oil spray holes 101 extend radially from the tooth surface to the gear hole, and the position of the plurality of oil spray holes 101 in the gear hole corresponds to the plurality of annular oil grooves 1112 of the gear shaft 11. The embodiment shows only two annular oil grooves 1112, but the invention is not limited thereto.

In the present embodiment, when the oil jet gear 10 is rotated at a high speed by the first gear 1, the lubricating oil is jetted outward by a plurality of oil jets through the main oil gallery 121 of the housing 12, the oil delivery passage 111 of the gear shaft 11, the oil jet passage 1111, the annular oil groove 1112, and the oil jet hole 101 of the oil jet gear 10, so that the lubricating oil can be supplemented to the fourth gear 4, the fifth gear 5, the sixth gear 6, and the seventh gear 7, which are distant from the first gear 1.

Referring to fig. 5, in the present embodiment, the thrust plate 13 is disposed at an end of the gear shaft 11 and is located outside the injection gear 10. The thrust plate 13 is used to position the oil injection gear 10, and ensure that the positions of a plurality of oil injection holes 101 in the gear hole of the oil injection gear 10 are matched with a plurality of annular oil grooves 1112 on the gear shaft 11. But the limit function prevents it from falling off the gear shaft 11.

In summary, the gear train arrangement of the diesel engine gear train cooling and lubricating system has the following advantages: the oil injection gear is arranged at the upper part of the first gear, and lubricating oil beams are periodically and outwards injected in the rotating process of the oil injection gear, so that the four, five, six and seven gears far away from the first gear can also obtain sufficient lubricating oil, the lubrication and cooling of a gear train are effectively increased, the working environment of the gear is improved, and the failure rate of the gear is reduced.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. A gear train arrangement for a diesel engine gear train cooling and lubrication system, the diesel engine gear train including a plurality of gears including a first gear disposed at a crankshaft end, the gear train arrangement comprising:

the oil injection gear is arranged above the first gear and meshed with the first gear, and a plurality of oil injection holes are formed in the oil injection gear; and

the oil injection gear is sleeved on the gear shaft, an oil conveying passage is arranged in the gear shaft, and the oil conveying passage is communicated with a main oil passage arranged on the shell;

the oil injection holes are communicated with the oil conveying passage, and when the oil injection gear rotates, the oil injection holes can inject oil beams around for lubricating the gears.

2. A gear train arrangement of a diesel engine gear train cooling and lubricating system as set forth in claim 1, wherein said gear shaft includes:

a plurality of annular oil grooves which are annularly arranged on the gear shaft in parallel; and

and the plurality of oil spraying channels are arranged along the radial direction of the gear shaft, one end of each oil spraying channel is communicated with the oil conveying channel, and the other end of each oil spraying channel is communicated with the annular oil groove.

3. A gear train arrangement for a gear train cooling and lubricating system of a diesel engine as set forth in claim 2, wherein the plurality of oil spray holes of the oil spray gear extend radially from a tooth surface to a gear hole, and the plurality of oil spray holes are positioned in the gear hole corresponding to the plurality of annular oil grooves of the gear shaft.

4. A gear train arrangement of a gear train cooling and lubricating system of a diesel engine as set forth in claim 1, further comprising a thrust plate provided at an end portion of the gear shaft outside the oil injection gear, the thrust plate serving to position the oil injection gear and prevent it from falling off the gear shaft.

5. A gear train arrangement for a diesel engine gear train cooling and lubricating system as set forth in claim 2, wherein said gear shaft further includes a plurality of mounting holes for securing said gear shaft to said housing by bolts.