CN209781645U - Lubricating structure of drive bridge shell - Google Patents

Abstract

the utility model relates to a lubricating structure of drive electric bridge casing, including the first half shell of reduction gear and the half shell of reduction gear second, and be equipped with input shaft chamber, intermediate shaft chamber and output shaft chamber between the first half shell of reduction gear and the half shell of reduction gear second, be equipped with first oil groove and the second oil groove of leading respectively on the terminal surface that intermediate shaft chamber and output shaft chamber are used for installing the bearing, the input shaft chamber part that is located on the first half shell inner wall of reduction gear still is equipped with the third and leads the oil groove, the outside in input shaft chamber, intermediate shaft chamber still is equipped with U type strengthening rib, and the opening part of U type strengthening rib is located the casing middle part, still is equipped with inside bellied swell on the half shell of reduction gear second between output shaft chamber and the shells inner wall. The utility model discloses be equipped with a plurality of oil grooves of leading on the bearing installation face of the cavity that forms between half shell of reduction gear second at motor reducer integral type casing, improved the lubricated effect of part especially bearing.

Description

Lubricating structure of drive bridge shell

Technical Field

The utility model relates to a new energy automobile drive assembly's casing especially relates to a lubricating structure of drive bridge casing.

Background

The existing drive bridge is compact in structure, and due to the structural design, a lubricating system in the drive bridge often cannot fully lubricate corresponding parts, particularly in a cavity of a speed reducer, a lubricating oil path is complex, and a bearing, particularly a bearing of an input shaft, is difficult to fully lubricate.

Disclosure of Invention

In order to solve the technical problem, the utility model aims at providing a lubricating structure of drive bridge casing rational in infrastructure, lubricated effectual.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

The utility model provides a lubricating structure of drive electric bridge casing, includes half shell of first half shell of reduction gear and reduction gear second, and is equipped with input shaft chamber, intermediate shaft chamber and output shaft chamber between half shell of first half shell of reduction gear and the reduction gear second, be equipped with first oil groove and the second oil groove of leading respectively on the terminal surface that intermediate shaft chamber and output shaft chamber are used for installing the bearing, the input shaft chamber part that is located on the first half shell inner wall of reduction gear still is equipped with the third and leads the oil groove, the outside in input shaft chamber, intermediate shaft chamber still is equipped with U type strengthening rib, and the opening part of U type strengthening rib is located the casing middle part, still is equipped with inside bellied swell on the half shell of reduction gear between output shaft chamber and the shells inner wall.

As a preferable scheme: and a gas collection cavity is also arranged between the U-shaped reinforcing rib and the inner wall on the second half shell of the speed reducer, a bolt hole for installing a ventilation plug is arranged at the top of the gas collection cavity, an oil baffle plate is fixed at one side of the gas collection cavity, and a gas leading hole is also arranged between the gas collection cavity and the oil baffle plate.

As a preferable scheme: the first oil guide groove, the second oil guide groove and the third oil guide groove are two, and the two first oil guide grooves, the two second oil guide grooves and the two third oil guide grooves are distributed at an interval of 180 degrees.

The utility model discloses be equipped with a plurality of oil guide grooves on the bearing installation face of the cavity that motor reducer integral type casing formed between the second half shell of reduction gear to both sides in the casing are equipped with bulge and U type strengthening rib respectively, and the bulge is used for reducing the cavity volume, does benefit to the availability factor that improves lubricating oil; the U-shaped reinforcing rib is used for guiding lubricating oil to flow into the input shaft cavity; the cooperation of the above structures improves the lubrication effect of the components, especially the bearings.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an integrated drive bridge;

FIG. 2 is a schematic diagram of the transmission principle of the integrated drive bridge;

FIG. 3 is a schematic view of an angle of the motor reducer integral housing;

FIG. 4 is a schematic view of another angle of the motor reducer integral housing;

FIG. 5 is a schematic view of an angular lubrication configuration of the motor reducer integral housing;

FIG. 6 is a schematic view of another angular lubrication configuration of the motor reducer integral housing;

FIG. 7 is a schematic view of the lubricated structure of the first half-shell of the reducer;

FIG. 8 is a schematic view of the input shaft;

FIG. 9 is a schematic illustration of a possible machining interference of the gears of the input shaft;

FIG. 10 is a schematic view of a first mounting arrangement of the input shaft and gear;

FIG. 11 is a schematic cross-sectional view of FIG. 10;

FIG. 12 is a schematic view of a second arrangement of the input shaft and gear;

FIG. 13 is a schematic cross-sectional view of FIG. 12;

FIG. 14 is a schematic view of a third mounting arrangement for the input shaft and gear;

FIG. 15 is a schematic cross-sectional view of FIG. 14;

FIG. 16 is a schematic view of the mounting structure of the input shaft and the bearing mounting block;

fig. 17 is a schematic cross-sectional view of fig. 16.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 1 and 2, the integrated drive bridge includes a housing, a motor 2, and a speed reducer 1 and a PEU component 3 respectively disposed at two ends of the motor 2, where the housing includes a first speed reducer half-shell 10 and a motor speed reducer integrated housing 20, an input shaft 4 is formed by integrally forming an input shaft of the speed reducer 1 and a shaft of the motor 2, the input shaft 4 is disposed in the housing through a bearing, a rotor silicon steel sheet 5 is disposed at one end of the input shaft 4, a first gear 41 is disposed at the other end of the input shaft, an intermediate shaft 6 and a speed reducer assembly 7 are further disposed in the housing through a bearing, a second gear 61 is disposed on the intermediate shaft 6, the second gear 61 is engaged with the first gear 41, a third gear 62 is further disposed on the intermediate shaft 6, a speed reducer gear ring 71 is disposed on the speed reducer assembly 7, and the third gear 62 is engaged.

The utility model discloses an integrated form drive bridge provides a motor, reduction gear and the integrated integrative design of PEU, and the driving system adopts the run-in structure, and the motor shaft is structure as an organic whole with the input shaft of reduction gear, and retarder housing, motor casing structure as an organic whole, and this design can effectively reduce the installation space and the installation degree of difficulty, has reduced the total weight of product, effectively reduces manufacturing cost.

As shown in fig. 3 and 4, the motor and reducer integrated housing 20 includes a motor housing and a reducer second half-shell which are integrally formed, the motor housing is integrally cylindrical, has a diameter of 150mm to 165mm, and is used for interference fit with a motor stator, and the diameter interference of the interference fit is 0.2mm to 0.3mm, so that the bearing capacity of the drive bridge is ensured, the structure is simple, and the safety is high; and the outer wall of the motor shell is provided with a plurality of heat dissipation ribs 21 at intervals along the axial direction, the design of the heat dissipation ribs of the shell is that the flow guide characteristic of the shell to air fluid is considered when the whole vehicle driving direction is also the windward direction of the shell, simulation analysis is carried out on different arrangements, longitudinal rib schemes, transverse rib schemes and the like are compared, the heat dissipation effect is analyzed, the transverse ribs are arranged by combining a shell casting process, the width of each rib is 3-5mm, the height of each rib is 10-15 mm, the interval between each rib is 12-18mm, the number of the ribs on the shell is 11-15, and the heat dissipation requirements of the motor are met.

the outer wall of the motor shell is circumferentially provided with a plurality of longitudinal reinforcing ribs 22, the longitudinal reinforcing ribs 22 extend to the second half shell of the speed reducer, the number of the longitudinal reinforcing ribs of the integrated shell of the motor speed reducer is 1-3, the thickness of the longitudinal reinforcing ribs is 5-8 mm, the height of the longitudinal reinforcing ribs is 10-15 mm, and the longitudinal reinforcing ribs longitudinally penetrate through the motor shell and the second half shell of the speed reducer, so that the strength and the rigidity of the shell can be improved, and the casting molding process requirements of the shell are considered.

And a plurality of triangular reinforcing ribs 23 are further arranged between the outer side wall of the motor shell and the end surface of the second half shell of the speed reducer. The motor shell and the second half shell of the speed reducer are cast into a whole, triangular reinforcing ribs with the thickness of 3-5mm are used between the motor shell and the second half shell of the speed reducer, the triangular reinforcing ribs are longitudinally arranged along the motor shell and are fused with reinforcing ribs on the outer side of the second half shell of the speed reducer, and the triangular reinforcing ribs effectively improve the heat dissipation efficiency of the shell and the strength of the shell; the rib height and the rib arrangement form can be adjusted according to different strength and rigidity requirements, and the number of the ribs is 3-6.

The motor comprises a motor shell, a plurality of grid type grooves 24 are circumferentially arranged on the lower portion of the inner wall of the motor shell, separation reinforcing ribs 25 are arranged between every two adjacent grid type grooves 24, a limiting convex ring 26 used for axially positioning a stator is further arranged on the inner wall of the motor shell, and the limiting convex ring 26 is located on the upper portions of the grid type grooves 24. The motor reducer integral type casing has saved the flange joint face of traditional reduction gear and motor, designs into grid formula recess 24 in original connection space position department, and the degree of depth of grid formula recess is 30mm-45mm, and grid formula recess position need be left and is separated strengthening rib 25 and be 10-15, separates strengthening rib 25 thickness and be 3mm-5mm, effectual weight reduction when guaranteeing intensity, has improved cast manufacturability, has solved defects such as shrinkage cavity, shrinkage porosity that easily appears in the casting.

still be equipped with rings 27 on the lateral wall of motor casing, rings 27 and motor reducer integral type casing 20 integrated into one piece cast molding, rings 27's thickness is greater than 5mm, and rings 27 middle part is equipped with the through-hole, the aperture of through-hole is 12mm-18 mm. The rings are 80 mm-95 mm away from the motor end cover flange, and the part cost and the production line assembly cost of the independent rings in split type design can be saved in integral casting.

The motor reducer integral type casing has simplified the connected mode between motor casing and the retarder casing, has improved the convenience of installation, has saved whole car installation space simultaneously, has alleviateed drive bridge's weight, and the integrated form can increase the strengthening rib that fuses on original two casing bases, has improved the intensity of structure.

as shown in fig. 5, 6 and 7, an input shaft cavity 203, an intermediate shaft cavity 204 and an output shaft cavity 205 are arranged between the first half shell 10 and the second half shell of the speed reducer, the input shaft cavity is used for mounting an input shaft, the intermediate shaft cavity is used for mounting an intermediate shaft, and the output shaft cavity is used for mounting a speed reducer assembly; the end surfaces of the middle shaft cavity 204 and the output shaft cavity 205 for mounting bearings are respectively provided with a first oil guide groove 207 and a second oil guide groove 208, the part of the input shaft cavity 203 on the inner wall of the first half shell 10 of the speed reducer is also provided with a third oil guide groove 103, the outer sides of the input shaft cavity 203 and the middle shaft cavity 204 are also provided with a U-shaped reinforcing rib 209, the opening of the U-shaped reinforcing rib 209 is positioned in the middle of the shell, the U-shaped reinforcing ribs cast on the peripheries of the input cavity and the middle shaft cavity are used for blocking oil, the width of the U-shaped reinforcing ribs is 3mm-5mm, the height difference between the U-shaped reinforcing ribs and the mounting plane is 3mm-5mm, and the U-; an inward convex bulge 206 is further arranged between the output shaft cavity 205 and the inner wall of the shell on the second half shell of the speed reducer, so that the volume of the cavity is reduced, and the utilization rate of lubricating oil is improved.

And a gas collection cavity 210 is also arranged between the U-shaped reinforcing rib 209 and the inner wall on the second half shell of the speed reducer, the center of the gas collection cavity forms an included angle alpha with a vertical line of a connecting line of the input shaft cavity, the input shaft cavity 203 and the middle shaft cavity 204, the alpha value is 22-25 degrees, and the gas collection cavity can be used for balancing the pressure in the shell by matching with a vent plug. The length of the gas collection cavity is 22mm-30mm, the width is 12mm-18mm, and the depth is 25 mm-35 mm; the top of the gas collecting cavity 210 is provided with a bolt hole 211 for installing a vent plug, one side of the gas collecting cavity 210 is fixed with an oil baffle plate, and a gas guiding hole 212 is further arranged between the gas collecting cavity 210 and the oil baffle plate. The inside of the gas collection cavity can also be processed into a labyrinth structure to be matched with the bolt hole for installing the vent plug.

first lead oil groove 207, second lead oil groove 208, third lead oil groove 103 and be two, and two first lead oil grooves 207, two second lead oil grooves 208, two third lead oil grooves 103 and all become 180 distributions at interval, first lead oil groove, second lead oil groove, third lead oil groove all wide 5mm-7mm for guide lubricating oil flow in bearing cavity. The lubricating structure is simple, but can effectively lubricate each bearing cavity.

As shown in fig. 2, a first bearing 42 and a third bearing 44 are respectively arranged at two ends of the input shaft 4, a second bearing 43 is arranged in the middle of the input shaft, the first bearing 42, the second bearing 43 and the third bearing 44 form a 3-pivot structure, and no over-constraint is ensured by controlling the fit clearance between the bearings and the shaft and between the bearings and the bearing seats; the both ends of jackshaft 6 are equipped with fourth bearing 63, fifth bearing 64 respectively, fourth bearing 63 is located the inboard of second bearing 43, and fourth bearing 63 overlaps with second bearing 43 along axial part and sets up, fifth bearing 64 is located the outside of third bearing 44, and fifth bearing 64 overlaps with third bearing 44 along axial part and sets up.

the input shaft is designed into an integrated form, namely, a motor shaft and the input shaft of the speed reducer are designed into a whole, 4 bearings which originally support two shafts can be reduced into 3 bearings, and meanwhile, the mechanical transmission connection of the motor shaft and the input shaft of the speed reducer is reduced; through the input shaft chamber and the middle shaft chamber of adjustment casing, make second bearing 43, fourth bearing 63 become the design side by side, two bearings are left and right sides and arrange promptly, can effectively reduce the centre-to-centre spacing of input shaft and middle shaft, and then reducible differential and the centre-to-centre spacing of input shaft, and then reduce the radial overall dimension of assembly.

The first bearing 42, the second bearing 43 and the third bearing 44 are all ball bearings, or are a ball bearing, a conical bearing and a needle bearing in sequence; the fourth bearing 63 and the fifth bearing 64 are both ball bearings or both cone bearings. And a sixth bearing 72 and a seventh bearing 73 are respectively arranged at two ends of the speed reducer assembly 7, and the sixth bearing 72 and the seventh bearing 73 are both ball bearings or both cone bearings.

the structure is an axial parallel design layout mode of the bearings in the integrated drive bridge, the input shaft is designed in an integrated mode, the structure is simplified, the installation is convenient, the structural strength is improved, the noise is reduced, meanwhile, the large-end bearing of the motor and the left bearing of the intermediate shaft are designed in parallel, the radial space of a shaft system can be effectively reduced by the arrangement mode, and the reduction of the radial arrangement space of a speed reducer is particularly facilitated.

As shown in fig. 9, in the process of processing the gear shaft of the driving motor, when the gear is finely ground, the grinding wheel interferes with the shaft section of the bearing mounting block for mounting the motor, so that the function of the shaft section of the bearing mounting block is lost, and the normal application of the matching parts (such as a bearing, an oil seal and the like) is affected, so that in order to avoid the above problems, the input shaft adopts a structure that the gear is assembled with the input shaft after being independently manufactured, or adopts a structure that the bearing mounting block is assembled with the input shaft after being independently manufactured, and the concrete structure of the former is as follows:

As shown in fig. 8, a bearing mounting block 45 is further disposed between the rotor silicon steel sheet 5 and the first gear 41 on the input shaft 4, the bearing mounting block 45 and the input shaft 4 are integrally formed, and the first gear 41 is mounted on the input shaft 4 in a shrink fit, spline fit or key groove fit manner, so that the maintenance cost can be effectively reduced; the specific mounting mode of the first gear and the input shaft comprises the following three structures.

The first structure is as shown in fig. 10 and 11, the input shaft 4 on one side of the bearing mounting block 45 is a third shaft segment 410, the third shaft segment 410 is stepped, the first gear 41 comprises a gear ring and a half shaft sleeve 411 which are integrally formed, the gear ring is fixed on the third shaft segment 410, one side of the gear ring is abutted to the step surface of the third shaft segment 410, the half shaft sleeve 411 is located on the other side of the gear ring and is stepped, the third bearing 44 is arranged on the half shaft sleeve 411, and the third bearing 44 is limited by the step surface and a clamp spring.

The second structure is as shown in fig. 12 and 13, the input shaft 4 on one side of the bearing mounting block 45 is a third shaft segment 410, the first gear 41 includes an integrally formed gear ring and a shaft sleeve 412, the gear ring is located in the middle of the outer side of the shaft sleeve 412, the shaft sleeve 412 is fixed on the third shaft segment 410, the outer end of the shaft sleeve 412 is stepped, and the third bearing 44 is arranged on the outer end of the shaft sleeve 412 and is limited by a stepped surface and a snap spring.

As shown in the third structure diagrams 14 and 15, two ends of the input shaft 4 are respectively a first shaft section 47 for mounting the first bearing 42 and a second shaft section 48 for mounting the third bearing 44, the first shaft section 47 and the second shaft section 48 are both stepped cylinders, clamp springs are respectively arranged on the first shaft section 47 and the second shaft section 48, and the first bearing 42 and the third bearing 44 are respectively limited by the clamp springs and a stepped surface.

The specific structure of the bearing mounting block assembled with the input shaft after being independently manufactured is as follows:

as shown in fig. 16 and 17, a bearing mounting block 45 is further disposed on the input shaft 4 between the rotor silicon steel sheet 5 and the first gear 41, the bearing mounting block 45 is mounted on the input shaft 4 in a shrink fit, spline fit or key-slot fit manner, and the first gear 41 and the input shaft 4 are integrally formed.

The input shaft 4 is further provided with a raised positioning section 454, the bearing mounting block 45 is fixed on the positioning section 454, one end of the bearing mounting block 45 is provided with a convex ring 452, the outer wall of the convex ring 452 is provided with a groove 451, and one side of the bearing mounting block 45, which is located on the convex ring 452, is a supporting portion 453 for mounting the second bearing 43.

the axle center of input shaft 4 is equipped with blind hole 49 for to the structure subtract material, reduce structure weight. And a positioning groove 46 for circumferentially positioning the silicon steel sheets is further arranged on the side wall of the input shaft 4.

the design scheme 1 is that the gear section and the shaft section are designed into two parts, the two parts of shafts can be connected in a hot sleeve, spline fit, key groove fit and other modes, the problem of machining interference is effectively solved, the bearing section on one side of the gear section is integrated, the combination length of the gear section and the shaft section is increased, the gear section can be independently replaced if a fault occurs in the use process of the gear, the shaft section of the main body can be continuously used, and the maintenance cost is reduced. According to the design scheme 2, a shaft section of the motor bearing mounting block is separated from the shaft main body to form a section of hollow shaft sleeve, and the hollow shaft sleeve is formed into two sections of shafts which are respectively processed, so that the problem of fine grinding interference is avoided. The two parts of shafts can be connected in a hot sleeve mode, a spline fit mode, a key groove fit mode and the like, and the problem of machining interference is effectively solved.

in conclusion, the two shafts of the motor shaft and the input shaft of the speed reducer are designed into a whole, so that the connection mode between the motor output shaft and the input shaft of the speed reducer is simplified, the installation convenience is improved, the space size of the driving bridge is saved, the weight of the driving bridge is reduced, the number of used bearings can be reduced by the design of the integrated shaft, the number of the used bearings is reduced from 4 to 3, and the product cost is reduced.

It should be noted that the above embodiments are merely representative examples of the present invention. The utility model can also have a plurality of deformations. Any simple modification, equivalent changes and modifications made to the above embodiments according to the essence of the present invention should be considered as belonging to the protection scope of the present invention.

Claims (3)

1. A lubricating structure for a drive bridge housing, characterized in that: including first half shell (10) of reduction gear and the half shell of reduction gear second, and be equipped with input shaft chamber (203), intermediate shaft chamber (204) and output shaft chamber (205) between first half shell (10) of reduction gear and the half shell of reduction gear second, be equipped with first oil groove (207) and second oil groove (208) of leading on the terminal surface that intermediate shaft chamber (204) and output shaft chamber (205) were used for installing the bearing respectively, input shaft chamber (203) part that is located on first half shell (10) inner wall of reduction gear still is equipped with the third and leads oil groove (103), the outside of input shaft chamber (203), intermediate shaft chamber (204) still is equipped with U type strengthening rib (209), and the opening part of U type strengthening rib (209) is located the casing middle part, still is equipped with inside bellied swell (206) on the half shell of reduction gear second between output shaft chamber (205) and the shells inner wall.

2. a lubricating structure for a drive bridge housing according to claim 1, wherein: still be equipped with gas collection chamber (210) on the reduction gear second half shell between U type strengthening rib (209) and the inner wall, the top in gas collection chamber (210) is equipped with bolt hole (211) that are used for installing the breather plug, one side in gas collection chamber (210) is fixed with the oil baffle, and still is equipped with between gas collection chamber (210) and the oil baffle and draws gas hole (212).

3. a lubricating structure for a drive bridge housing according to claim 1, wherein: the oil guide grooves are characterized in that the first oil guide grooves (207), the second oil guide grooves (208) and the third oil guide grooves (103) are two, and the two first oil guide grooves (207), the two second oil guide grooves (208) and the two third oil guide grooves (103) are distributed at intervals of 180 degrees.