CN115899230A - Lubricating structure in engine transmission system - Google Patents

Abstract

The invention discloses an internal lubricating structure of an engine transmission system, which comprises: the casing assembly is internally provided with a first gear and a second gear, the first gear is rotatably supported through a first bearing set, and the second gear is rotatably supported through a second bearing set. The oil guide shaft assembly is arranged in the shaft holes of the first gear and the second gear in the axial direction and is in splined connection with the shaft holes of the first gear and the second gear respectively, and the nozzle and the blocking cover are arranged at two ends of the oil guide shaft assembly respectively. And the oil guide shaft group, the first gear and the second gear are internally provided with communicated lubricating oil passages so as to enable lubricating oil sprayed by the nozzle to enter the lubricating oil passages, and the first bearing group, the second bearing group and the connection part of the two splines are respectively lubricated by the lubricating oil passages under the action of centripetal force generated by rotation. The structure of the invention can save the space of structural layout, simplify the structural design of the engine, reduce the number of parts, and improve the lubricating efficiency and the reliability of the engine.

Description

Lubricating structure in the engine transmission system

technical field

The invention relates to the field of structural design of an engine transmission system, in particular to a lubricating structure in the engine transmission system.

Background technique

The speed parts in the aero-engine have the characteristics of heavy load and high speed. They need to be fully lubricated and dissipated to ensure their normal and reliable operation. It is especially important in the meshing parts of gear teeth, splines and bearings.

There are mainly two ways to lubricate in the existing schemes: one is to design special lubricating oil nozzles for spray lubrication at the meshing parts of the gear teeth, splines and bearings; A small number of nozzles are designed in the accessory transmission casing, and these parts are not directly lubricated, but the oil mist environment formed by these nozzles under high temperature and sputtering conditions is used to lubricate all parts indiscriminately.

The above two lubrication methods have obvious disadvantages: the first one designs a special lubrication nozzle in each key part, which will complicate the structural design of the engine (oil circuit design, nozzle design increase), parts The increase in the number will also increase the demand for the oil supply capacity of the lubricating oil pump, which will increase the weight of the engine. At the same time, the increase in parts and lubricating oil circuits will also reduce the reliability of the engine; the second type is for all parts. The method of oil mist lubrication is only suitable for low speed and low load. The splines are generally located in the inner cavity of the gear shaft. In this lubrication method, it is basically impossible to obtain lubrication and heat dissipation.

Contents of the invention

The invention provides a lubricating structure in the engine transmission system to solve the problems of complex engine structure design, large number of parts, strong demand for the oil supply capacity of the lubricating oil pump, low reliability of the engine, and only applicable to existing lubricating methods. Technical problems of low speed and low load.

The technical scheme that the present invention adopts is as follows:

A lubricating structure in an engine transmission system, comprising: a casing assembly, a first gear and a second gear coaxially arranged at intervals in the casing assembly, and the first gear is rotatably supported by a first bearing group, and the second The second gear is rotated and supported by the second bearing group; the casing assembly is also equipped with coaxial nozzles, oil guide shaft groups and plugs arranged at intervals in sequence, and the oil guide shaft group is installed on the first gear and the first gear along the axial direction. In the shaft hole of the second gear, and respectively splined with the shaft holes of the first gear and the second gear, the nozzle and the plug are respectively arranged at both ends of the oil guide shaft group; inside the oil guide shaft group, the first gear and the second gear There is a connected lubricating oil passage, so that the lubricating oil sprayed by the nozzle enters the lubricating oil passage, and under the action of the centripetal force generated by the rotation, the first bearing group, the second bearing group and the two splines are connected through the lubricating oil passage through the lubricating oil passage. Lubricate separately.

Further, the oil guiding shaft group includes plugs and spline shafts coaxially arranged at intervals; the plugs are inserted into the shaft hole of the first gear from the first end of the first gear, and the first end of the shaft hole of the first gear is blocked. One end; the two ends of the spline shaft are respectively located in the shaft holes of the first gear and the second gear, and are connected with the first gear through the first spline structure, and connected with the second gear through the second spline structure.

Further, the first bearing set includes a first bearing and a second bearing installed at both ends of the first gear; the second bearing set includes a third bearing and a fourth bearing installed at both ends of the second gear.

Further, the lubricating oil circuit includes a connected first lubricating oil circuit, a second lubricating oil circuit and a third lubricating oil circuit; the first lubricating oil circuit includes a first central hole penetrating the plug in the axial direction, and the outer circumference of the plug The circumferential annular cavity formed by inward concave, the first oil passage hole opened on the plug and connected to the first central hole and the circumferential annular cavity, and the second oil passage opened on the first gear and connected to the circumferential annular cavity and the first bearing; The second lubricating oil circuit includes the first axial gap between the plug and the spline shaft, the first annular gap between the spline shaft and the shaft hole of the first gear, and is set on the first gear and communicates with the first ring. The third oil passage hole to the gap and the second bearing; the third lubricating oil circuit includes the second central hole passing through the spline shaft in the axial direction, and the second axial gap between the second end of the spline shaft and the blocking cover , the second annular clearance between the spline shaft and the shaft hole of the second gear, the fourth oil passage hole and the fifth oil hole opened on the second gear and respectively communicating with the second annular clearance, the third bearing and the fourth bearing oil hole.

Further, let the diameter of the spray hole of the nozzle be E, the distance between the oil inlet end of the plug and the first oil passage hole be A1, the axial length of the plug be A2, the axial length of the spline shaft be A3, and the second The hole diameter of the oil hole is C, the hole diameter of the third oil hole is D, the hole diameter of the fourth oil hole is G, and the hole diameter of the fifth oil hole is J; then: E=1～1.2mm; A1=E ; A2=E; A2+A3≤200mm; C=D=G=J=E-0.2.

Further, assuming that the diameter of the first central hole is F, then: F=8˜11 mm.

Further, the first end of the spline shaft close to the plug is concavely processed with a tapered hole in the shape of an inverted cone, and the diameter of the large end of the tapered hole is B, and the diameter of the small end is A4, then: F+2﹤B ≤F+6; A4≥10mm.

Further, the end faces of the two ends of the spline shaft are respectively provided with concave oil passage grooves for the lubricating oil to pass through, and the depth of the oil passage grooves is A5, then: A5≥2mm.

Further, the lubricating structure in the engine transmission system also includes a first seal, a second seal and a third seal; the first seal and the second seal are respectively installed on the outer circle of the plug, and are separately arranged on the circumferential ring The two sides of the cavity are used to prevent the lubricating oil in the circumferential ring cavity from leaking through the gap between the plug and the first gear shaft hole; the outer circle of the second end of the spline shaft is also provided with an outwardly protruding and annular ring flange , the third sealing member is installed on the outer circle of the annular flange, and is used to cooperate with the blocking cover to prevent the lubricating oil in the second annular gap from leaking from the gap between the spline shaft and the second gear shaft hole.

Further, the casing assembly includes a first casing, a connecting pipe and a second casing which are sequentially arranged and connected in the axial direction; the nozzle and the first gear are installed in the first casing at intervals along the axial direction, and the second gear Installed in the second casing; the first end of the spline shaft is located in the first gear, and the opposite second end is inserted into the second gear after passing through the connecting pipe.

The present invention has the following beneficial effects:

In the internal lubrication structure of the engine transmission system of the present invention, for bearings, splines and other parts, by designing a nozzle, the lubrication of multiple splines and multiple sets of bearing groups can be realized at the same time. Compared with each position, a special nozzle lubrication method is provided. The structural layout space can be greatly saved, the structural design of the engine is simple, and the number of parts is small, thereby reducing the processing difficulty of the engine and the weight of the engine, and the demand for the oil supply capacity of the lubricating oil pump. It will improve the lubrication efficiency and the reliability of the engine, and is suitable for the situation of higher speed and higher load; compared with the way of using oil mist environment lubrication, each lubrication point can be more fully lubricated; the internal lubrication of the engine transmission system of the present invention In the structure, under the action of centrifugal force, the lubricating oil is used to form the characteristics of oil throwing, so as to realize the design of the lubricating oil circuit and the radial lubrication of the bearing.

In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. Hereinafter, the present invention will be described in further detail with reference to the drawings.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is a disassembled schematic diagram before the lubricating structure in the engine transmission system of the preferred embodiment of the present invention is not assembled;

Fig. 2 is a schematic diagram of the lubricating structure in the engine transmission system of the preferred embodiment of the present invention after assembly;

Fig. 3 is a schematic diagram of the structure of the oil passage tank in Fig. 1 .

illustration

10. Case assembly; 11. First case; 12. Connecting pipe; 13. Second case; 20. First gear; 30. Second gear; 41. First bearing; 42. Second bearing; 51. The third bearing; 52. The fourth bearing; 60. The nozzle; 71. The plug; 72. The spline shaft; 720. The oil groove; Hole; 912, circumferential ring cavity; 913, the first oil hole; 914, the second oil hole; 92, the second lubricating oil circuit; 921, the first axial clearance; 922, the first annular clearance; 923, the first Three oil holes; 93, the third lubricating oil circuit; 931, the second center hole; 932, the second axial gap; 933, the second annular gap; 934, the fourth oil hole; 935, the fifth oil hole hole; 111, the first sealing element; 112, the second sealing element; 113, the third sealing element.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in various ways defined and covered below.

With reference to Fig. 1 and Fig. 2, the preferred embodiment of the present invention provides a kind of lubricating structure in the engine transmission system, comprises: casing assembly 10, is provided with the first gear 20 that coaxial interval is arranged in casing assembly 10 and The second gear 30, and the first gear 20 is rotatably supported by the first bearing set, and the second gear 30 is rotatably supported by the second bearing set. The casing assembly 10 is also provided with coaxial nozzles 60 arranged at intervals in sequence, an oil guide shaft group and a blocking cover 80, and the oil guide shaft group is installed in the shaft holes of the first gear 20 and the second gear 30 in the axial direction. , and are splined to the shaft holes of the first gear 20 and the second gear 30 respectively, and the nozzle 60 and the plug cap 80 are separately arranged at both ends of the oil guide shaft group. The oil guide shaft group, the first gear 20 and the second gear 30 are provided with a connected lubricating oil passage, so that the lubricating oil sprayed by the nozzle 60 enters the lubricating oil passage, and passes through the lubricating oil passage under the action of the centripetal force generated by the rotation. Lubricate the first bearing group, the second bearing group and the two spline connections respectively.

As shown in Figure 2, the lubricating oil sprayed from the nozzle 60 will diverge when sprayed under the given oil supply temperature and oil supply pressure of the engine, while the oil guide shaft group, the first gear 20 and the second gear The second gear 30 is a rotating part during the working process. Therefore, after the lubricating oil enters the oil guide shaft group, under the action of centrifugal force, it will enter the first bearing group, the second bearing group and the oil guide shaft group respectively through the guiding action of the lubricating oil circuit. The two spline connections between the shaft group and the first gear 20 and the second gear 30, so as to realize the lubrication of the first bearing group, the second bearing group and the two spline connections respectively; After the bearing group and the second bearing group, return to the case assembly 10 under the action of gravity, and finally enter the lubricating oil pump for recirculation.

In the internal lubricating structure of the engine transmission system of the present invention, for bearings, splines and other parts, by designing a nozzle 60, the lubrication of multiple splines and multiple sets of bearing groups can be realized at the same time. Compared with each position, a special nozzle lubrication method is provided. , can greatly save the structural layout space, make the structural design of the engine simple and the number of parts small, thereby reducing the processing difficulty of the engine and the weight of the engine, and the demand for the oil supply capacity of the lubricating oil pump. At the same time, the reduction of parts and lubricating oil circuits, It will also improve the lubrication efficiency and the reliability of the engine, and is applicable to the situation of higher speed and higher load; compared with the way of using oil mist environment lubrication, each lubrication point can be more fully lubricated; the engine transmission system of the present invention In the lubricating structure, under the action of centrifugal force, lubricating oil forms the characteristics of oil throwing, so as to realize the design of lubricating oil circuit and the radial lubrication of bearings.

Optionally, as shown in FIG. 2 , the oil guide shaft set includes plugs 71 and spline shafts 72 coaxially arranged at intervals. The plug 71 is inserted into the shaft hole of the first gear 20 from the first end of the first gear 20 , and blocks the first end of the shaft hole of the first gear 20 . The two ends of the spline shaft 72 are respectively located in the shaft holes of the first gear 20 and the second gear 30, and are connected with the first gear 20 through the first spline structure, and connected with the second gear 30 through the second spline structure . The structure design of the oil guide shaft group is simple, easy to manufacture and process, and the process cost is low.

Optionally, as shown in FIG. 1 , the first bearing set includes a first bearing 41 and a second bearing 42 installed at both ends of the first gear 20 , and the first gear 20 is simple to support and easy to install. The second bearing group includes a third bearing 51 and a fourth bearing 52 installed at both ends of the second gear 30 , the second gear 30 is simple to support and easy to install. Optionally, in the present invention, the first gear 20 is a cylindrical gear, and the second gear 30 is a bevel gear.

Optionally, as shown in FIG. 2 , the lubricating oil circuit includes a first lubricating oil circuit 91 , a second lubricating oil circuit 92 and a third lubricating oil circuit 93 . The first lubricating oil circuit 91 includes a first central hole 911 penetrating through the plug 71 in the axial direction, a circumferential annular cavity 912 formed by indentation on the outer peripheral surface of the plug 71, opened on the plug 71 and communicating with the first central hole 911 and The first oil passage hole 913 of the circumferential ring chamber 912 and the second oil passage hole 914 opened on the first gear 20 and communicating with the circumferential ring chamber 912 and the first bearing 41 . The second lubricating oil circuit 92 includes a first axial gap 921 between the plug 71 and the spline shaft 72, a first annular gap 922 between the spline shaft 72 and the shaft hole of the first gear 20, and is opened in the first The gear 20 communicates with the first annular gap 922 and the third oil hole 923 of the second bearing 42 . The third lubricating oil circuit 93 includes a second central hole 931 passing through the spline shaft 72 in the axial direction, a second axial gap 932 between the second end of the spline shaft 72 and the blocking cover 80 , the spline shaft 72 and the first The second annular gap 933 between the shaft holes of the second gear 30, the fourth oil hole 934 and the fourth oil passage hole 934 that are opened on the second gear 30 and communicate with the second annular gap 933 and the third bearing 51 and the fourth bearing 52 respectively. Five oil holes 935.

As shown in Figure 2, the lubricating oil sprayed from the nozzle 60 will diverge when sprayed under the given oil supply temperature and pressure of the engine, while the plug 71, the spline shaft 72, the first The gear 20 and the second gear 30 are both rotating parts during the working process, so the lubricating oil entering the plug 71 will stick to the hole wall surface of the first central hole 911 of the plug 71 under the action of centrifugal force, and a part of the lubricating oil When passing through the first oil hole 913 of the plug 71, the lubricating oil will be thrown out under the action of centrifugal force, enter the circumferential ring cavity 912, and then reach the first bearing 41 through the second oil hole 914 to realize its lubrication; After the lubricating oil leaves the plug 71 and goes to the right, when it reaches the first axial gap 921 between the plug 71 and the spline shaft 72, part of it enters the first annular gap 922 between the plug 71 and the spline shaft 72 , to lubricate the spline engagement between the spline shaft 72 and the first gear 20, and then lubricate the second bearing 42 through the third oil hole 923; another part of the lubricating oil enters the second center hole inside the spline shaft 931, reach the blocking cover 80, enter the second annular gap 933 through the second axial gap 932 between the blocking cover 80 and the spline shaft 72, and realize the spline engagement between the second gear 30 and the spline shaft 72 Lubrication, and then through the fourth oil hole 934 on the second gear 30 to reach the third bearing 51 to lubricate it, and through the fifth oil hole 935 to reach the fourth bearing 52 to lubricate it.

In the structure of the present invention, the lubricating oil sprayed out by a nozzle 60 realizes the lubrication of two splines and four bearings, the lubrication efficiency is greatly improved, and the number of lubricating oil nozzle designs and the number of lubricating oil pipelines are greatly reduced, reducing the The engine structure is complex and heavy, and the lubricating oil can be reused, and the splines and bearings can be lubricated in multiple places on one lubricating oil circuit, and the splines are lubricated first, and then the bearings are lubricated.

Optionally, as shown in FIG. 2 , it is assumed that the spray hole diameter of the nozzle 60 is E, the distance between the oil inlet end of the plug 71 and the first oil passage hole 913 is A1, the axial length of the plug 71 is A2, and the spline The axial length of the shaft 72 is A3, the diameter of the second oil passage 914 is C, the diameter of the third oil passage 923 is D, the diameter of the fourth oil passage 934 is G, and the diameter of the fifth oil passage 935 is The aperture is J. but:

E=1～1.2mm.

A1=25～35E.

A2=55～65E.

A2+A3≤200mm.

C=D=G=J=E-0.2.

In actual design, the axial length A2 of the plug 71 needs to be jointly designed with the structure of the first gear 20 and the spline shaft 72: under a specific working temperature and working pressure, the lubricating oil leaves the orifice of the nozzle 60 It will diverge, and the farther away it is, the larger the angle of expansion will be. In order to ensure that the third lubricating oil circuit 93 can have enough lubricating oil, the axial distance A2 of the plug 71 cannot be too long, and the spline shaft 72 has a tapered hole The large end aperture B of the plug can not be too small (subsequent definition), and to ensure that the first lubricating oil circuit 91 and the second lubricating oil circuit 92 also have sufficient oil quantity, the axial distance A2 of the plug 71 can not be too short. Thereby the inventor of the present application after long-term exploration and a large amount of tests, make nozzle 60 injection aperture E, the aperture of the second oil passage 914 be C, the aperture of the 3rd oil passage 923 be D, the 4th oil passage 934 The diameter of the hole is G, the diameter of the fifth oil passage hole 935 is J, and the axial length A2 of the plug 71 is determined by calculation and simulation, or determined after the actual measurement and calibration through the lubricating oil quantity test, that is, the above E, A2, C, The specific limits of D, G, and J values, and then determine A1 and A3 by combining these limit values with simulation calculation or lubricating oil quantity test.

Optionally, as shown in FIG. 2 , assuming that the diameter of the first central hole 911 is F, then: F=8˜11 mm. The limit of F value is also determined by calculation and simulation, or determined after actual measurement and calibration through lubricating oil quantity test.

Optionally, as shown in Figures 2 and 3, the first end of the spline shaft 72 near the plug 71 is concavely processed with an inverted tapered tapered hole, and the diameter of the large end of the tapered hole is B, small The end aperture is A4, then:

F+2﹤B≤F+6.

A4≥10mm.

In the actual design, B and A4 are also determined through calculation and simulation referring to the above method, or determined after actual measurement and calibration through the lubricating oil quantity test.

Optionally, as shown in Figures 1 and 3, the end faces of the two ends of the spline shaft 72 are respectively provided with concave oil passage grooves 720 for the passage of lubricating oil, and the groove depth of the oil passage grooves 720 is A5, then :

A5≥2mm.

In actual design, the spline shaft 72 is a floating shaft. In order to prevent the spline shaft 72 from fitting too tightly with the first gear 20 or the blocking cover 80 during the working process, so that the lubricating oil cannot pass through, the two ends of the spline shaft 72 Oil grooves 720 are respectively designed on the end faces, and the groove depth design of the oil grooves 720 is also determined by calculation and simulation referring to the above method, or determined after actual measurement and calibration through the lubricating oil quantity test.

Optionally, as shown in FIG. 2 , the lubricating structure in the engine transmission system further includes a first seal 111 , a second seal 112 and a third seal 113 . The first sealing member 111 and the second sealing member 112 are installed on the outer circle of the plug 71 respectively, and are respectively arranged on both sides of the circumferential ring cavity 912, so as to prevent the lubricating oil in the circumferential ring cavity 912 from passing between the plug 71 and the second sealing member. The gap between the shaft holes of a gear 20 leaks. The outer circle of the second end of the spline shaft 72 is also provided with a protruding and annular annular flange, and the third seal 113 is installed on the outer circle of the annular flange to cooperate with the blocking cover 80 to prevent the first The lubricating oil in the two annular gaps leaks from the gap between the spline shaft 72 and the shaft hole of the second gear 30 .

Optionally, as shown in FIG. 2 , the casing assembly 10 includes a first casing 11 , a connecting pipe 12 and a second casing 13 arranged and connected in sequence along the axial direction. The nozzle 60 and the first gear 20 are axially spaced in the first housing 11 , and the second gear 30 is installed in the second housing 13 . The first end of the spline shaft 72 is located in the first gear 20 , and the opposite second end passes through the connecting tube 12 and extends into the second gear 30 . The casing assembly 10 is simple in structure and easy to process, and the overall layout is compact and reasonable, which can effectively save the installation space in the engine.

The installation process of the lubricating structure in the engine transmission system of the present invention is as follows: first, the plug cover 80 is installed into the bevel gear to form an interference fit, and then the fourth bearing 52 is installed on the bevel gear to form a gear assembly; then the first bearing 41 is installed Put the casing cover of the first casing 11, the second bearing 42 into the first casing 11, and the third bearing 51 into the second casing 13; then the cylindrical gear is packed into the first casing 11, the bevel gear Install the second casing 13, then install the casing cover of the first casing 11 and the first casing 11 through bolts; finally, install the spline shaft 72, the plug 71 and the nozzle 60 from left to right Put it into the shaft hole of the cylindrical gear and the bevel gear, and the assembly process is shown in Figure 1.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A lubricating structure in an engine transmission system, characterized in that it comprises: A casing assembly (10), the casing assembly (10) is provided with a first gear (20) and a second gear (30) coaxially spaced apart, and the first gear (20) passes through the first A bearing set is rotatably supported, and the second gear (30) is rotatably supported through the second bearing set; The casing assembly (10) is also provided with coaxial nozzles (60), an oil guide shaft group and a blocking cover (80) arranged at intervals in sequence, and the oil guide shaft group is axially installed on the In the shaft holes of the first gear (20) and the second gear (30), and respectively connected with the shaft holes of the first gear (20) and the second gear (30), the nozzle (60) ) and the blocking cover (80) are separately located at the two ends of the oil guide shaft group; The oil guide shaft group, the first gear (20) and the second gear (30) are provided with a communicating lubricating oil passage for making the lubricating oil sprayed by the nozzle (60) enter the lubricating oil passage, and lubricate the first bearing group, the second bearing group and the two spline joints respectively through the lubricating oil passage under the centripetal force generated by the rotation. 2. The lubricating structure in the engine transmission system according to claim 1, characterized in that, The oil guide shaft group includes plugs (71) and spline shafts (72) coaxially arranged at intervals; The plug (71) is loaded into the shaft hole of the first gear (20) from the first end of the first gear (20), and blocks the first shaft hole of the first gear (20). one end; The two ends of the spline shaft (72) are respectively located in the shaft holes of the first gear (20) and the second gear (30), and are connected to the first gear (20) through the first spline structure. ) and connected with the second gear (30) through a second spline structure. 3. The lubricating structure in the engine transmission system according to claim 2, characterized in that, The first bearing group includes a first bearing (41) and a second bearing (42) installed at both ends of the first gear (20); The second bearing group includes a third bearing (51) and a fourth bearing (52) arranged at both ends of the second gear (30). 4. The lubricating structure in the engine transmission system according to claim 3, characterized in that, The lubricating oil passage includes a connected first lubricating oil circuit (91), a second lubricating oil circuit (92) and a third lubricating oil circuit (93); The first lubricating oil circuit (91) includes a first central hole (911) passing through the plug (71) in the axial direction, and a circumferential ring cavity (912) formed by the concave outer peripheral surface of the plug (71). ), the first oil hole (913) that is set on the plug (71) and communicates with the first central hole (911) and the circumferential ring cavity (912), and the first oil hole (913) that is set on the first gear (20 ) and communicates with the second oil hole (914) of the circumferential ring cavity (912) and the first bearing (41); The second lubricating oil circuit (92) includes a first axial gap (921) between the plug (71) and the spline shaft (72), and the spline shaft (72) and the spline shaft (72) The first annular gap (922) between the shaft holes of the first gear (20) is set on the first gear (20) and communicates with the first annular gap (922) and the second bearing ( 42) the third oil hole (923); The third lubricating oil circuit (93) includes a second central hole (931) passing through the spline shaft (72) in the axial direction, the second end of the spline shaft (72) and the blocking cover ( 80) between the second axial gap (932), the second annular gap (933) between the spline shaft (72) and the shaft hole of the second gear (30), opened in the first The fourth oil hole (934) and the fifth oil hole on the second gear (30) respectively communicate with the second annular gap (933), the third bearing (51) and the fourth bearing (52). Oil hole (935). 5. The lubricating structure in the engine transmission system according to claim 4, characterized in that, Assume that the injection hole diameter of the nozzle (60) is E, the distance between the oil inlet end of the plug (71) and the first oil passage hole (913) is A1, and the axial distance of the plug (71) is The length is A2, the axial length of the spline shaft (72) is A3, the diameter of the second oil passage hole (914) is C, the diameter of the third oil passage hole (923) is D, The aperture diameter of the fourth oil passage hole (934) is G, and the aperture diameter of the fifth oil passage hole (935) is J; then: E=1～1.2mm; A1=(25～35)E; A2=(55～65)E; A2+A3≤200mm; C=D=G=J=E-0.2. 6. The lubricating structure in the engine transmission system according to claim 4, characterized in that, Suppose the aperture of the first central hole (911) is F, then: F=8～11mm. 7. The lubricating structure in the engine transmission system according to claim 6, characterized in that, The first end of the spline shaft (72) close to the plug (71) is concavely processed with an inverted tapered tapered hole, the diameter of the large end of the tapered hole is B, and the diameter of the small end is A4, then: F+2﹤B≤F+6; A4≥10mm. 8. The internal lubricating structure of the engine transmission system according to claim 4, characterized in that, The end faces of the two ends of the spline shaft (72) are respectively provided with recessed oil passage grooves (720) for the passage of lubricating oil. If the depth of the oil passage grooves (720) is A5, then: A5≥2mm. 9. The lubricating structure in the engine transmission system according to claim 4, characterized in that, The lubricating structure in the engine transmission system further includes a first seal (111), a second seal (112) and a third seal (113); The first sealing element (111) and the second sealing element (112) are respectively installed on the outer circle of the plug (71), and are respectively arranged on both sides of the circumferential ring cavity (912), so as to It is used to prevent the lubricating oil in the circumferential ring chamber (912) from leaking through the gap between the plug (71) and the shaft hole of the first gear (20); The outer circle of the second end of the spline shaft (72) is also provided with a protruding and ring-shaped annular flange, and the third sealing member (113) is installed on the outer circle of the annular flange, so as to It is used to cooperate with the blocking cover (80) to prevent lubricating oil in the second annular gap from leaking from the gap between the spline shaft (72) and the shaft hole of the second gear (30). 10. The internal lubricating structure of the engine transmission system according to claim 4, characterized in that, The casing assembly (10) includes a first casing (11), a connecting pipe (12) and a second casing (13), which are sequentially arranged and connected in the axial direction; The nozzle (60) and the first gear (20) are axially spaced in the first casing (11), and the second gear (30) is installed in the second casing within (13); The first end of the spline shaft (72) is located in the first gear (20), and its opposite second end passes through the connecting pipe (12) and then extends into the second gear (30) .

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