CN209818677U - Three-gear speed change light electric drive axle assembly - Google Patents
Three-gear speed change light electric drive axle assembly Download PDFInfo
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- CN209818677U CN209818677U CN201920378465.9U CN201920378465U CN209818677U CN 209818677 U CN209818677 U CN 209818677U CN 201920378465 U CN201920378465 U CN 201920378465U CN 209818677 U CN209818677 U CN 209818677U
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Abstract
The utility model discloses a three keep off variable speed lightweight electric drive axle assembly, mainly by the differential mechanism assembly, disconnect-type reducing gear box casing assembly, straight-tooth reduction gear assembly, the input shaft assembly, planetary gear reduction assembly and three clutch assembly of group constitute, differential mechanism assembly casing links firmly with first straight-tooth gear is coaxial, third straight-tooth gear links firmly with the idle second planet carrier of cover on the input shaft is coaxial, in two planetary gear system of planetary gear reduction assembly, two sun gears are installed in proper order on the input shaft, second outer lane and the coaxial fixed connection of first planet carrier, three clutch assembly of group install respectively in first outer lane and input shaft, first outer lane and disconnect-type reducing gear box casing assembly, between second outer lane and the disconnect-type reducing gear box casing assembly. The utility model discloses under the accurate rapid condition of shifting is switched and is shifted in the realization three-gear, with electric vehicle drive axle and the integrated optimization of gearbox structure, very big lightweight demand of having satisfied.
Description
Technical Field
The invention belongs to the technical field of electric automobile transmission, and particularly relates to a three-gear speed change light electric drive axle assembly.
Background
In the existing electric automobile, the electric drive axle still has many defects, and it is difficult to satisfy the requirements of light weight and multiple gears at the same time. The electric drive axle that adopts on the present electric automobile still remains the transaxle structure of transmission vehicle, and present electric motor car has the less problem of fender position, to this problem, in current research and design, carries out intelligent antithetical couplet with the motor and has become a trend, so when guaranteeing electric automobile fender position quantity, accomplishes that the transaxle structure lightweight will become a hot problem. Therefore, the problems to be solved in the current electric drive axle mainly include the following two points:
1. at present, many electric automobiles have fewer gears and can only carry out speed regulation through a motor;
2. at present, the drive axle structure of the electric automobile is similar to that of the traditional automobile drive axle structure, and the drive axle is overweight and consumes more energy.
Disclosure of Invention
Aiming at the defects in the prior art, the invention discloses a three-gear speed-changing light electric drive axle assembly, which can optimize the structural design of a drive axle and reduce the overall weight of the drive axle while increasing the number of gears of an electric vehicle. The technical scheme of the invention is as follows by combining the attached drawings of the specification:
the three-gear speed change light electric drive axle assembly consists of a differential assembly 1, a separate reduction gearbox shell assembly 2, a reduction gearbox end cover assembly 3, a straight-tooth reduction gear assembly 4, an input shaft assembly 5, a planetary gear reduction assembly 6 and three groups of clutch assemblies;
the shell of the differential assembly 1 is coaxially and fixedly connected with a first straight gear 12 of the straight-tooth reduction gear assembly 4 above;
in the straight-tooth reduction gear assembly 4, a first straight gear 12, a second straight gear 13 and a third straight gear 19 are sequentially meshed and connected, the third straight gear 19 is coaxially and fixedly connected with a rotary shaft sleeve of a second planet carrier 18 in the planetary gear reduction assembly 6, and the rotary shaft sleeve of the second planet carrier 18 is sleeved on an input shaft 17 of the straight-tooth reduction gear assembly 4 in an empty mode;
the planetary gear speed reduction assembly 6 consists of two groups of planetary gear trains which are axially arranged along the input shaft 17, wherein a second sun gear 20b and a first sun gear 20a are sequentially and coaxially fixed on the input shaft 17, and a second outer ring 25 is coaxially and fixedly connected with a first planet carrier 23;
in the first clutch assembly 7, a first clutch support frame 32 is coaxially and fixedly connected to the input shaft 17, a first friction plate 28a is coaxially arranged on the first clutch support frame 32, a first steel sheet 30a and the first friction plate 28a are arranged on the inner circumferential wall of the first outer ring 26 in a matching manner, and the separation or combination of the first outer ring 26 and the input shaft 17 is controlled by controlling the separation or combination of the first friction plate 28a and the first steel sheet 30 a;
in the second clutch assembly 8, a second friction plate 28b is coaxially and fixedly connected on the outer circumferential surface of the first outer ring 26, a second steel sheet 30b and the second friction plate 28b are installed on the inner wall of the split reduction gearbox shell assembly 2 in a matching manner, and the separation or combination of the first outer ring 26 and the split reduction gearbox shell assembly 2 is controlled by controlling the separation or combination of the second friction plate 28b and the second steel sheet 30 b;
in the third clutch assembly 9, a third friction plate 28c is coaxially and fixedly connected to the outer circumferential surface of the second outer ring 25, a third steel sheet 30c and the third friction plate 28c are installed on the inner wall of the split reduction gearbox shell assembly 2 in a matching manner, and the separation or combination of the second outer ring 25 and the split reduction gearbox shell assembly 2 is controlled by controlling the separation or combination of the third friction plate 28c and the third steel sheet 30 c.
Further, in the straight-tooth reduction gear assembly 4, the second straight gear 13 is sleeved on the second straight gear shaft 14 through the first copper bush 15 in an empty manner, the second straight gear shaft 14 is arranged below the input shaft 17 of the input shaft assembly 5 in parallel, and two ends of the second straight gear shaft 14 are respectively installed on the split type reduction gearbox shell assembly 2;
the third straight gear 19 and the second straight gear 13 are in equal ratio transmission, and the transmission ratio of the second straight gear 13 to the first straight gear 12 is greater than 1.
Further, in the planetary gear speed reduction assembly 6, a first planetary gear train is composed of a first sun gear 20a, a first planet gear 22a, a first planet carrier 23 and a first outer ring 26;
the first sun gear 20a is installed on the input shaft 17 through a flat key 21, the first planet gears 22a are respectively sleeved on short shafts of a planet gear shaft bracket of the first planet carrier 23 through a third copper sleeve 24a in a hollow mode, the first planet carrier 23 and a second outer ring 25 in the second planet gear train are of an integrated structure, the first planet gears 22a are respectively meshed with the first sun gear 20a and a first outer ring 26, and one end of the first outer ring 26 is installed in a groove of the split type reduction gearbox shell assembly 2.
Further, in the planetary gear speed reduction assembly 6, the second planetary gear train is composed of a second sun gear 20b, a second planet gear 22b, a second planet carrier 18 and a second outer ring 25;
the second planet carrier 18 is coaxially installed on the input shaft 17, a rotating shaft sleeve of the second planet carrier 18 is sleeved on the input shaft 17 in an empty mode through a second copper sleeve 16, the outer side of the rotating shaft sleeve of the second planet carrier 18 is connected with a third straight gear 19 through a spline, second planet gears 22b are sleeved on short shafts of a planet gear shaft frame of the second planet carrier 18 in an empty mode through fourth copper sleeves 24b respectively, a second sun gear 20b and the input shaft 17 are set to be of an integrated structure, the second planet gears 22b are meshed with the second sun gear 20b and a second outer ring 25 respectively, and one end of the second outer ring 25 is sleeved on a convex edge of a position corresponding to the split type reduction gearbox shell assembly 2.
Further, in the first clutch assembly 7, a first hydraulic cavity is formed between the first piston 29a and the side wall of the split reduction gearbox housing assembly 2, a first hydraulic oil port is formed on the split reduction gearbox housing assembly 2 corresponding to the first hydraulic cavity, the outer ring of the first piston 29a is mounted in a matching manner with the split reduction gearbox housing assembly 2, the inner ring of the first piston 29a is connected with the input shaft 17 in a matching manner, the first spring 27a is mounted in an annular groove in the end face of the first clutch support frame 32, one end of the first spring 27a is connected with the bottom of the annular groove of the first clutch support frame 32, the other end of the first spring 27a is connected with the end face of the first piston 29a, a circle of pressure plate is arranged on the outer circumference of the end face of the first piston 29a, and the pressure plate corresponds to the first steel sheet 30a and the first friction sheet 28 a;
when the pressure in the first hydraulic chamber rises, the first piston 29a presses the first steel sheet 30a to combine with the first friction plate 28a, so that the first outer ring 26 is fixedly connected with the first clutch support frame, and further the first outer ring 26 is fixedly connected with the input shaft 17, when the pressure in the first hydraulic chamber drops to zero, under the action of the restoring force of the first spring 27a, the first steel sheet 30a is separated from the first friction plate 28a and restores to the original position, and at the moment, the first outer ring 26 is separated from the input shaft 17.
Further, in the second clutch assembly 8, a second hydraulic cavity is formed between a second piston 29b and the side wall of the split reduction gearbox housing assembly 2, a second hydraulic oil port is formed on the split reduction gearbox housing assembly 2 corresponding to the second hydraulic cavity, and a second spring 27b is installed between the second piston 29b and a second steel sheet 30 b;
when the pressure in the second hydraulic cavity rises, the second piston 29b extrudes the second steel sheet 30b to be combined with the second friction sheet 28b, so that the first outer ring 26 is fixedly connected with the side wall of the split reduction gearbox shell assembly 2, when the pressure in the second hydraulic cavity drops to zero, the second steel sheet 30b is separated from the second friction sheet 28b to restore the original position under the action of the restoring force of the second spring 27b, and at the moment, the first outer ring 26 is separated from the side wall of the split reduction gearbox shell assembly 2.
Further, in the third clutch 9, a third hydraulic cavity is formed between a third piston 29c and the side wall of the split reduction gearbox housing assembly 2, a third hydraulic oil port is formed on the split reduction gearbox housing assembly 2 corresponding to the third hydraulic cavity, and a third spring 27c is installed between the third piston 29c and a third steel sheet 30 c;
when the pressure in the third hydraulic cavity rises, the third piston 29c extrudes the third steel sheet 30c to be combined with the third friction sheet 28c, so that the second outer ring 25 is fixedly jointed with the side wall of the split reduction gearbox shell assembly 2, when the pressure in the third hydraulic cavity drops to zero, the third steel sheet 30c is separated from the third friction sheet 28c to restore the original position under the action of the restoring force of the third spring 27c, and at the moment, the second outer ring 25 is also separated from the side wall of the split reduction gearbox shell assembly 2;
furthermore, lubricating oil is adopted for lubrication among friction plates and steel plates in the first clutch assembly 7, the second clutch assembly 8 and the third clutch assembly 9, and lubricating oil channels in the first clutch assembly 7, the second clutch assembly 8 and the third clutch assembly 9 are communicated with a lubricating oil channel of the planetary gear speed reduction assembly 6.
Furthermore, the split reduction gearbox shell assembly 2 is formed by sequentially bolting a first reduction gearbox shell 31a, a second reduction gearbox shell 31b and a third reduction gearbox shell 31c from left to right, and gaps between the first reduction gearbox shell 31a and the second reduction gearbox shell 31b and between the second reduction gearbox shell 31b and the third reduction gearbox shell 31c are sealed by adopting sealing tapes or sealing glue.
Compared with the prior art, the invention has the beneficial effects that:
1. the three-gear speed-changing light-weight electric drive axle assembly adopts three groups of clutch assemblies, and three gear changes of a direct gear, a medium-speed gear and a low-speed gear of an electric vehicle are realized by controlling the combination or the separation of the clutch assemblies;
2. the three-gear speed-changing light-weight electric drive axle assembly is structurally optimized, so that the structure of the drive axle assembly is more compact, and the advantages of the drive axle assembly in light weight are outstanding;
3. in the three-gear speed-changing light-weight electric drive axle assembly, the friction plate and the steel sheet of the clutch are communicated with the lubricating part of the planetary gear part, so that the number of parts is reduced, the convenience of assembly is improved, and the assembly precision is improved;
4. in the three-gear speed change light electric drive axle assembly, the split type gearbox is adopted, so that the assembly difficulty is reduced, and more possibilities are provided for design.
Drawings
FIG. 1 is a schematic view of the overall internal structure of a three-speed transmission light electric drive axle assembly according to the present invention;
FIG. 2 is a schematic structural view of a differential assembly in the three-speed light-weight electric drive axle assembly according to the present invention;
FIG. 3 is a schematic structural view of a straight-tooth reduction gear assembly in the three-speed transmission light electric drive axle assembly according to the present invention;
FIG. 4 is a schematic structural view of a planetary gear reduction assembly in the three-speed transmission light-weight electric drive axle assembly according to the present invention;
FIG. 5 is a schematic structural view of a clutch assembly in the three-speed transmission light-weight electric drive axle assembly according to the present invention;
FIG. 6 is a schematic structural view of a split reduction gearbox housing assembly in the three-gear transmission light electric drive axle assembly of the present invention;
in the figure:
1 differential mechanism assembly, 2 separated reduction gearbox shell assembly, 3 reduction gearbox end cover assembly,
4 straight tooth reduction gear assembly, 5 input shaft assembly, 6 planetary gear reduction assembly,
7a first clutch assembly, 8a second clutch assembly, 9a third clutch assembly,
10 differential bearings, 11 joint screws, 12 first straight gear,
13 second spur gear, 14 second spur gear shaft, 15 first copper bush,
16 a second copper bush, 17 an input shaft, 18 a second planet carrier,
19 a third spur gear, 20a first sun gear, 20b second sun gear,
21 flat key, 22a first planet wheel, 22b second planet wheel,
23 a first carrier, 24a third copper sleeve, 24b a fourth copper sleeve,
25 second outer ring 26 first outer ring, 27a first spring,
27b a second spring, 27c a third spring, 28a first friction plate,
28b, 28c, 29a, a first piston,
29b a second piston, 29c a third piston, 30a first steel plate,
30b, 30c, 31c, a first reduction box shell,
31b second reduction case housing, 31c third reduction case housing, 32 first clutch support bracket.
Detailed Description
In order to further illustrate the technical scheme and the specific working process thereof, the specific implementation mode of the invention is as follows by combining the attached drawings of the specification:
as shown in fig. 1, the invention provides a three-gear speed-changing light-weight electric drive axle assembly, which comprises a differential assembly 1, a separate reduction gearbox shell assembly 2, a reduction gearbox end cover assembly 3, a straight-tooth reduction gear assembly 4, an input shaft assembly 5, a planetary gear reduction assembly 6, a first clutch assembly 7, a second clutch assembly 8 and a third clutch assembly 9. The differential mechanism assembly 1, the straight-tooth reduction gear assembly 4, the input shaft assembly 5, the planetary gear reduction assembly 6, the first clutch assembly 7, the second clutch assembly 8 and the third clutch assembly 9 are all arranged in the split reduction gearbox shell assembly 2, power is input from the right end of the input shaft assembly 5, sequentially passes through the planetary gear reduction assembly 6 and the straight-tooth reduction gear assembly 4 along the transverse direction to the left and then is output from the differential mechanism assembly 1 arranged below the straight-tooth reduction gear assembly 4; the electric drive axle assembly realizes the switching among the three gears by controlling the connection or the disconnection of the first clutch assembly 7, the second clutch assembly 8 and the third clutch assembly 9 which are arranged at different positions around the planetary gear speed reducing assembly 6.
As shown in fig. 1 and 2, the differential assembly 1 is disposed below the three-gear speed-change light-weight electric drive axle assembly, the structure of the differential assembly 1 is similar to that of a conventional differential mechanism, the left end and the right end of the differential assembly 1 are rotatably mounted at the lower part of a shell assembly 2 of a split reduction gearbox through a differential bearing 10, and the structure of the differential assembly is different from that of the conventional differential mechanism in that a shell of the differential assembly 1 is not connected with a bevel gear, the shell of the differential assembly 1 is coaxially and fixedly connected with a first straight gear 12 in a straight-tooth reduction gear assembly 4 through a joint screw 11, and power is transmitted through the straight-tooth reduction gear assembly 4 and then directly transmitted from the first straight gear 12 to the shell of the differential assembly 1, so that power output.
The input shaft assembly 5 consists of an input shaft 17 and an input shaft mounting bearing, and the input shaft 17 is mounted on the inner side of the split reduction gearbox shell assembly 2 through the input shaft mounting bearing;
as shown in fig. 1 and 3, the spur reduction gear assembly 4 is disposed directly above the differential assembly 1, and is composed of a first spur gear 12, a second spur gear 13, a second spur gear shaft 14, and a third spur gear 19. As mentioned above, the first spur gear 12 is coaxially and fixedly connected with the housing of the differential assembly 1, the second spur gear shaft 14 is arranged in parallel below the input shaft 17 of the input shaft assembly 5, and both ends thereof are supported and mounted on the split reduction gearbox housing assembly 2; the second straight gear 13 is sleeved on the second straight gear shaft 14 in an empty manner through a first copper bush 15, wherein the first copper bush 15 and the second straight gear 13 are in interference fit, and the first copper bush 15 and the second straight gear shaft 14 are in transition fit; the second straight gear 13 is meshed with the first straight gear 12 below the second straight gear; at the position right above the second straight gear 13, the rotating shaft sleeve of the second planet carrier 18 of the planetary gear speed reduction assembly 6 is sleeved at the left end of the input shaft 17 of the input shaft assembly 5 through a second copper sleeve 16, and the third straight gear 19 is sleeved on the outer circumferential surface of the rotating shaft sleeve of the second planet carrier 18 through a spline sleeve, so that the torque transmission is realized; the third spur gear 19 is meshed with the second spur gear 13 below the third spur gear; the third spur gear 19 and the second spur gear 13 are in equal ratio transmission, the purpose of the equal ratio transmission is to increase the radial distance between the gears, the transmission ratio i between the second spur gear 13 and the first spur gear 12 is greater than 1, and the purpose of the equal ratio transmission is to reduce the output rotating speed and increase the output torque.
As shown in fig. 1 and 4, the planetary gear reduction assembly 6 is arranged on the right side of the straight-tooth reduction gear assembly 4, and includes a first planetary gear train composed of a first sun gear 20a, a first planetary gear 22a, a first planet carrier 23 and a first outer ring 26, and a second planetary gear train composed of a second sun gear 20b, a second planetary gear 22b, a second planet carrier 18 and a second outer ring 25.
In the second planetary gear train, the input shaft 17 passes through the axis direction of the second planetary gear carrier 18, the rotating shaft sleeve at the left end of the second planetary gear carrier 18 is sleeved at the left end of the input shaft 17, and the outer circumferential surface of the rotating shaft sleeve of the second planetary gear carrier 18 is provided with a spline matched with the third straight gear 19; in addition, the outer circumferential surface of the rotating shaft sleeve of the second planet carrier 18 is also rotatably matched and installed with the split reduction gearbox shell assembly 2 through a bearing; the right end of the second planet carrier 18 is a second planet wheel shaft carrier, and the second planet wheels 22b are respectively sleeved on the short shafts of the second planet wheel shaft carrier in an empty way through fourth copper sleeves 24 b; the second sun gear 20b and the input shaft 17 are arranged in an integrated structure, that is, the input shaft 17 is designed into a gear shaft structure to reduce the assembly difficulty, gears on the input shaft are used as the second sun gear 20b in the second planetary gear train, and the second sun gear 20b is respectively meshed with the second planetary gears 22b on the outer side of the circumference; the second outer ring 25 is arranged at the outer side of the second planet wheel 22b, gear teeth meshed with the second planet wheel 22b are arranged on the inner circumferential wall of the second outer ring 25, one end of the second outer ring 25 is sleeved on a convex edge at a corresponding position of the shell assembly 2 of the split reduction gearbox, and the outer circumferential surface of the second outer ring 25 is coaxially and fixedly connected with a third friction plate 28c of the third clutch assembly 9;
in the first planetary gear train, a first sun gear 20a is mounted on the input shaft 17 through a flat key 21; the first planet wheels 22a are respectively sleeved on the stub shafts of the first planet carrier 23 outside the first sun wheel 20a in an empty way through third copper sleeves 24 a; the first planet carrier 23 and the second outer ring 25 in the second planetary gear train are designed into an integral structure so as to ensure that the first planet carrier 23 and the second outer ring 25 synchronously rotate; the first sun gear 20a meshes with a circumferentially outer first planet gear 22 a; the first outer ring 26 is arranged on the outer side of the first planet wheel 22a, gear teeth meshed with the first planet wheel 22a are arranged on the inner circumferential wall of the first outer ring 26, one end of the first outer ring 26 is arranged in a groove in a corresponding position of the split reduction gearbox shell assembly 2, and the outer circumferential surface of the left end of the first outer ring 26 is coaxially and fixedly connected with a second friction plate 28b of the second clutch assembly 8.
As shown in fig. 1 and 5, the electric drive axle assembly of the present invention is provided with three sets of clutch assemblies, namely a first clutch assembly 7, a second clutch assembly 8 and a third clutch assembly 9, wherein each set of clutch assembly is composed of a spring, a friction plate, a piston and a steel sheet;
in the third clutch assembly 9, a third friction plate 28c is coaxially fixed on the outer circumferential surface of the second outer ring 25, a third steel sheet 30c and the third friction plate 28c are installed on the inner wall of the split reduction gearbox housing assembly 2 in a matching manner, a relatively closed third hydraulic cavity is formed between the left end surface of a third piston 29c and the side wall of the split reduction gearbox housing assembly 2, a third hydraulic oil port is formed in the split reduction gearbox housing assembly 2 corresponding to the third hydraulic cavity, the third piston 29c is a diaphragm spring, and a third spring 27c is installed between the third piston 29c and the leftmost third steel sheet 30 c; when the pressure in the third hydraulic cavity rises, the third piston 29c extrudes the third steel sheet 30c to be combined with the third friction sheet 28c, so that the second outer ring 25 is fixedly jointed with the side wall of the split reduction gearbox shell assembly 2, when the pressure in the third hydraulic cavity drops to zero, the third steel sheet 30c is separated from the third friction sheet 28c to restore the original position under the action of the restoring force of the third spring 27c, and at the moment, the second outer ring 25 is also separated from the side wall of the split reduction gearbox shell assembly 2;
in the second clutch assembly 8, a second friction plate 28b is coaxially fixed on the outer circumferential surface of the first outer ring 26, a second steel sheet 30b and the second friction plate 28b are installed on the inner wall of the split gearbox housing assembly 2 in a matching manner, a relatively closed second hydraulic cavity is formed between the right end surface of a second piston 29b and the side wall of the split gearbox housing assembly 2, a second hydraulic oil port is formed in the split gearbox housing assembly 2 corresponding to the second hydraulic cavity, the second piston 29b is a diaphragm spring, and a second spring 27b is installed between the second piston 29b and the rightmost second steel sheet 30 b; when the pressure in the second hydraulic cavity rises, the second piston 29b extrudes the second steel sheet 30b to be combined with the second friction sheet 28b, so that the first outer ring 26 is fixedly jointed with the side wall of the split reduction gearbox shell assembly 2, when the pressure in the second hydraulic cavity drops to zero, the second steel sheet 30b is separated from the second friction sheet 28b to restore the original position under the action of the restoring force of the second spring 27b, and at the moment, the first outer ring 26 is separated from the side wall of the split reduction gearbox shell assembly 2;
in the first clutch assembly 7, the first friction plate 28a is coaxially installed on a first clutch support frame 32, the first clutch support frame 32 is coaxially arranged at the right end of the first outer ring 26, and the inner ring of the first clutch support frame 32 is coaxially connected with the input shaft 17 through a spline; the first steel sheet 30a and the first friction sheet 28a are installed on the inner circumferential wall of the right end of the first outer ring 26 in a matching manner, a relatively closed first hydraulic cavity is formed between the right end face of the first piston 29a and the side wall of the split reduction gearbox shell assembly 2, a first hydraulic oil port is formed on the split reduction gearbox shell assembly 2 corresponding to the first hydraulic cavity, the outer ring of the first piston 29a is installed in a matching manner with the split reduction gearbox shell assembly 2, the inner ring of the first piston 29a is in transition fit with the input shaft 17, the first spring 27a is a spiral spring, the first spring 27a is installed in an annular groove at the right end of the first clutch support frame 32, one end of the first spring 27a is connected with the bottom of the annular groove of the first clutch support frame 32, the other end of the first spring is connected with the middle part of the left end face of the first piston 29a, the left end face of the first piston 29a is provided, the platen corresponds to the rightmost first steel sheet 30 a; when the pressure in the first hydraulic chamber rises, the first piston 29a presses the first steel sheet 30a to combine with the first friction plate 28a, so that the first outer ring 26 is fixedly connected with the first clutch support frame, and further the first outer ring 26 is fixedly connected with the input shaft 17, when the pressure in the first hydraulic chamber drops to zero, under the action of the restoring force of the first spring 27a, the first steel sheet 30a is separated from the first friction plate 28a and restores to the original position, and at the moment, the first outer ring 26 is separated from the input shaft 17.
Lubricating oil is adopted for lubrication among the friction plates and the steel sheets in the first clutch assembly 7, the second clutch assembly 8 and the third clutch assembly 9, and a lubricating oil channel in the first clutch assembly 7, the second clutch assembly 8 and the third clutch assembly 9 is communicated with a lubricating oil channel of the planetary gear speed reduction assembly 6, so that the number of parts is reduced, the convenience of assembly is increased, and the assembly precision is improved.
As shown in fig. 1 and 6, the split reduction gearbox housing assembly 2 is formed by sequentially bolting a first reduction gearbox housing 31a, a second reduction gearbox housing 31b and a third reduction gearbox housing 31c from left to right, and gaps between the first reduction gearbox housing 31a and the second reduction gearbox housing 31b and between the second reduction gearbox housing 31b and the third reduction gearbox housing 31c are sealed by sealing tapes or sealing glue.
As shown in fig. 1, the reduction gearbox end cover assembly 3 is composed of a plurality of reduction gearbox end covers, and the reduction gearbox end covers are fixedly installed at openings at the left end and the right end of the separated reduction gearbox shell assembly 2 through screws, so that the box body of the separated reduction gearbox shell assembly 2 is encapsulated.
The three-gear speed-changing light-weight electric drive axle assembly provided by the invention has three transmission gears of a direct gear, an intermediate gear and a low gear, and the specific working process under each gear is as follows:
when pressure oil enters the first hydraulic cavity from the first hydraulic oil port in the first clutch assembly 7, the pressure in the first hydraulic cavity rises, the first piston 29a is pushed to extrude the first steel sheet 30a to be combined with the first friction plate 28a, the first clutch assembly 7 starts to work, at this time, the input shaft 17 and the first outer ring 26 are combined and fixed, the two rotate at the same speed, namely, the first sun gear 20a and the first outer ring 26 which are coaxially and fixedly connected with the input shaft 17 keep the same speed, according to the transmission characteristic of the planetary gear train, at this time, the first planet carrier 23 and the input shaft 17 keep the same speed, namely, the second outer ring 25 which is coaxially and fixedly connected with the first planet carrier 23 and the input shaft 17 keep the same speed, similarly, the second planet carrier 18 and the input shaft 17 keep the same speed, namely, the planetary gear reduction assembly 6 does not perform the reduction function, at this time, the electric drive axle assembly is in a direct gear, power is transmitted from the input shaft 17 to the first carrier 23, the second carrier 18, the third spur gear 19, the second spur gear 13, and the first spur gear 12 in this order, and then transmitted from the first spur gear 12 to the differential assembly output through the joint screw 11.
When pressure oil enters the second hydraulic cavity from the second hydraulic oil port in the second clutch assembly 8, the pressure in the second hydraulic cavity rises, the second piston 29b is pushed to press the second steel sheet 30b to be jointed with the second friction sheet 30b, the second clutch assembly 8 starts to work, at the moment, the first outer ring 26 is jointed with the second speed reducing box shell 31b, the second speed reducing box shell 31b is fixed, and therefore the rotating speed of the first outer ring 26 is zero. Assuming that the ratio of the number of teeth of the first outer ring 26 to the first planet gears 22a is p1, the ratio of the number of teeth of the second outer ring to the second planet gears 22b is p2, and the rotation speed of the input shaft 17 is 1, we can obtain: the rotation speed of the first carrier 23 is 1/(1+ p1), that is, the rotation speed of the second outer ring 25 coaxially and fixedly connected to the first carrier 23 is 1/(1+ p1), and the rotation speed of the second sun gear 20b integrated with the input shaft 17 is 1, so the rotation speed of the second carrier 18 is 1/(1+ p2) + p2/[ (1+ p2) (1+ p1) ], and therefore, the electric drive axle assembly is at a medium speed, and power is transmitted from the input shaft 17 to the first carrier 23, the second carrier 18, the third spur gear 19, the second spur gear 13, and the first spur gear 12 in this order, and then transmitted from the first spur gear 12 to the differential assembly through the joint screw 11.
When pressure oil enters the third hydraulic cavity from the third hydraulic oil port in the third clutch assembly 9, the pressure in the third hydraulic cavity rises, the third piston 29c is pushed to press the third steel plate 30c to combine with the third friction plate 28c, the clutch assembly 9 starts to work, at this time, the second outer ring 25 is combined with the first reduction gearbox shell 31a, the first reduction gearbox shell 31a is fixed, and therefore the rotating speed of the second outer ring 25 is zero. Assuming that the ratio of the second outer ring 25 to the second planetary gear 22b is p2, the rotation speed of the input shaft 17 is 1, i.e. the rotation speed of the second sun gear 20b integrated with the input shaft 17 is 1, so the rotation speed of the second planet carrier 18 is 1/(1+ p2), and at this time, the electric drive axle assembly is in a low gear, and power is transmitted from the input shaft 17 to the second planet carrier 18, the third spur gear 19, the second spur gear 13, the first spur gear 12 in this order, and then transmitted from the first spur gear 12 to the differential assembly through the joint screw 11.
Claims (9)
1. Three keep off gear shift lightweight electric drive axle assembly, its characterized in that:
the device consists of a differential assembly (1), a split type reduction box shell assembly (2), a reduction box end cover assembly (3), a straight-tooth reduction gear assembly (4), an input shaft assembly (5), a planetary gear reduction assembly (6) and three groups of clutch assemblies;
a shell of the differential assembly (1) is coaxially and fixedly connected with a first straight gear (12) of an upper straight-tooth reduction gear assembly (4);
in the straight-tooth reduction gear assembly (4), a first straight gear (12), a second straight gear (13) and a third straight gear (19) are sequentially meshed and connected, the third straight gear (19) is coaxially and fixedly connected with a rotary shaft sleeve of a second planet carrier (18) in the planetary gear reduction assembly (6), and the rotary shaft sleeve of the second planet carrier (18) is sleeved on an input shaft (17) of the straight-tooth reduction gear assembly (4) in an empty mode;
the planetary gear speed reduction assembly (6) consists of two groups of planetary gear trains which are axially arranged along the input shaft (17), wherein a second sun gear (20b) and a first sun gear (20a) are sequentially and coaxially fixed on the input shaft (17), and a second outer ring (25) is coaxially and fixedly connected with a first planet carrier (23);
in the first clutch assembly (7), a first clutch support frame (32) is coaxially and fixedly connected to an input shaft (17), a first friction plate (28a) is coaxially arranged on the first clutch support frame (32), a first steel sheet (30a) and the first friction plate (28a) are arranged on the inner circumferential wall of a first outer ring (26) in a matched mode, and the separation or combination of the first outer ring (26) and the input shaft (17) is controlled by controlling the separation or combination of the first friction plate (28a) and the first steel sheet (30 a);
in the second clutch assembly (8), a second friction plate (28b) is coaxially and fixedly connected to the outer circumferential surface of the first outer ring (26), a second steel sheet (30b) and the second friction plate (28b) are installed on the inner wall of the shell assembly (2) of the split reduction gearbox in a matching manner, and the separation or combination of the first outer ring (26) and the shell assembly (2) of the split reduction gearbox is controlled by controlling the separation or combination of the second friction plate (28b) and the second steel sheet (30 b);
in the third clutch assembly (9), a third friction plate (28c) is coaxially and fixedly connected to the outer circumferential surface of the second outer ring (25), a third steel sheet (30c) and the third friction plate (28c) are installed on the inner wall of the shell assembly (2) of the separate reduction gearbox in a matching mode, and the separation or combination of the second outer ring (25) and the shell assembly (2) of the separate reduction gearbox is controlled by controlling the separation or combination of the third friction plate (28c) and the third steel sheet (30 c).
2. The three-speed transmission light-weight electric drive axle assembly according to claim 1, wherein:
in the straight-tooth reduction gear assembly (4), a second straight gear (13) is sleeved on a second straight gear shaft (14) in an empty mode through a first copper sleeve (15), the second straight gear shaft (14) is arranged below an input shaft (17) of the input shaft assembly (5) in parallel, and two ends of the second straight gear shaft (14) are respectively installed on the separated reduction box shell assembly (2);
the third straight gear (19) and the second straight gear (13) are in equal ratio transmission, and the transmission ratio of the second straight gear (13) to the first straight gear (12) is greater than 1.
3. The three-speed transmission light-weight electric drive axle assembly according to claim 1, wherein:
in the planetary gear speed reduction assembly (6), a first planetary gear train consists of a first sun gear (20a), a first planetary gear (22a), a first planet carrier (23) and a first outer ring (26);
a first sun gear (20a) is installed on an input shaft (17) through a flat key (21), a first planet gear (22a) is respectively sleeved on short shafts of a planet gear shaft frame of a first planet carrier (23) through a third copper sleeve (24a), the first planet carrier (23) and a second outer ring (25) in a second planet gear train are of an integrally formed structure, the first planet gear (22a) is respectively meshed with the first sun gear (20a) and a first outer ring (26), and one end of the first outer ring (26) is installed in a groove of a shell assembly (2) of a split reduction gearbox.
4. The three-speed transmission light-weight electric drive axle assembly according to claim 1, wherein:
in the planetary gear speed reduction assembly (6), a second planetary gear train consists of a second sun gear (20b), a second planetary gear (22b), a second planetary gear carrier (18) and a second outer ring (25);
the second planet carrier (18) is coaxially arranged on the input shaft (17), a rotating shaft sleeve of the second planet carrier (18) is sleeved on the input shaft (17) through a second copper sleeve (16) in an empty mode, the outer side of the rotating shaft sleeve of the second planet carrier (18) is connected with a third straight gear (19) through a spline, second planet gears (22b) are sleeved on short shafts of a planet gear shaft frame of the second planet carrier (18) through fourth copper sleeves (24b) in an empty mode respectively, a second sun gear (20b) and the input shaft (17) are arranged into an integrated structure, the second planet gears (22b) are meshed with a second sun gear (20b) and a second outer ring (25) respectively, and one end of the second outer ring (25) is sleeved on a convex edge of a corresponding position of the split reduction gearbox shell assembly (2).
5. The three-speed transmission light-weight electric drive axle assembly according to claim 1, wherein:
in the first clutch assembly (7), a first hydraulic cavity is formed between a first piston (29a) and the side wall of the split reduction gearbox shell assembly (2), a first hydraulic oil port is formed in a shell assembly (2) of the split reduction gearbox corresponding to the first hydraulic cavity, an outer ring of a first piston (29a) is installed in a matching manner with the shell assembly (2) of the split reduction gearbox, an inner ring of the first piston (29a) is connected with an input shaft (17) in a matching manner, a first spring (27a) is installed in an annular groove in the end face of a first clutch support frame (32), one end of the first spring (27a) is connected with the bottom of the annular groove of the first clutch support frame (32), the other end of the first spring (27a) is connected with the end face of the first piston (29a), a ring of pressure plate is arranged on the outer circumference of the end face of the first piston (29a), the pressure plate corresponds to a first steel sheet (30a) and a first friction sheet (28 a);
when the pressure in the first hydraulic cavity rises, the first piston (29a) presses the first steel sheet (30a) to be combined with the first friction sheet (28a), so that the first outer ring (26) is fixedly connected with the first clutch support frame, the first outer ring (26) is fixedly connected with the input shaft (17), when the pressure in the first hydraulic cavity drops to zero, the first steel sheet (30a) is separated from the first friction sheet (28a) to restore the original position under the action of the restoring force of the first spring (27a), and at the moment, the first outer ring (26) is separated from the input shaft (17).
6. The three-speed transmission light-weight electric drive axle assembly according to claim 1, wherein:
in the second clutch assembly (8), a second hydraulic cavity is formed between a second piston (29b) and the side wall of the split reduction gearbox shell assembly (2), a second hydraulic oil port is formed in the split reduction gearbox shell assembly (2) corresponding to the second hydraulic cavity, and a second spring (27b) is installed between the second piston (29b) and a second steel sheet (30 b);
when the pressure in the second hydraulic cavity rises, the second piston (29b) extrudes the second steel sheet (30b) to be combined with the second friction sheet (28b), so that the first outer ring (26) is fixedly jointed with the side wall of the shell assembly (2) of the split reduction gearbox, when the pressure in the second hydraulic cavity drops to zero, the second steel sheet (30b) is separated from the second friction sheet (28b) to restore the original position under the action of the restoring force of the second spring (27b), and at the moment, the first outer ring (26) is also separated from the side wall of the shell assembly (2) of the split reduction gearbox.
7. The three-speed transmission light-weight electric drive axle assembly according to claim 1, wherein:
in the third clutch assembly (9), a third hydraulic cavity is formed between a third piston (29c) and the side wall of the split reduction gearbox shell assembly (2), a third hydraulic oil port is formed in the split reduction gearbox shell assembly (2) corresponding to the third hydraulic cavity, and a third spring (27c) is installed between the third piston (29c) and a third steel sheet (30 c);
when the pressure in the third hydraulic cavity rises, the third piston (29c) extrudes the third steel sheet (30c) to be combined with the third friction sheet (28c), so that the second outer ring (25) is fixedly jointed with the side wall of the shell assembly (2) of the split reduction gearbox, when the pressure in the third hydraulic cavity drops to zero, the third steel sheet (30c) is separated from the third friction sheet (28c) to restore the original position under the action of the restoring force of the third spring (27c), and at the moment, the second outer ring (25) is separated from the side wall of the shell assembly (2) of the split reduction gearbox.
8. The three-speed transmission light-weight electric drive axle assembly according to claim 1, wherein:
and lubricating oil is adopted for lubrication among friction plates and steel sheets in the first clutch assembly (7), the second clutch assembly (8) and the third clutch assembly (9), and lubricating oil channels in the first clutch assembly (7), the second clutch assembly (8) and the third clutch assembly (9) are communicated with a lubricating oil channel of the planetary gear speed reduction assembly (6).
9. The three-speed transmission light-weight electric drive axle assembly according to claim 1, wherein:
the split type reduction gearbox shell assembly (2) is formed by sequentially connecting a first reduction gearbox shell (31a), a second reduction gearbox shell (31b) and a third reduction gearbox shell (31c) through bolts from left to right, and gaps between the first reduction gearbox shell (31a) and the second reduction gearbox shell (31b) and between the second reduction gearbox shell (31b) and the third reduction gearbox shell (31c) are sealed through sealing tapes or sealing glue.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109751380A (en) * | 2019-03-25 | 2019-05-14 | 吉林大学 | Three gear speed change lightweight electric drive axle assemblies |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109751380A (en) * | 2019-03-25 | 2019-05-14 | 吉林大学 | Three gear speed change lightweight electric drive axle assemblies |
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