CN112848799A - Coaxial type insertion tube type electric drive pickup bridge - Google Patents

Coaxial type insertion tube type electric drive pickup bridge Download PDF

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Publication number
CN112848799A
CN112848799A CN202110278685.6A CN202110278685A CN112848799A CN 112848799 A CN112848799 A CN 112848799A CN 202110278685 A CN202110278685 A CN 202110278685A CN 112848799 A CN112848799 A CN 112848799A
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CN
China
Prior art keywords
aluminum
aluminum shell
shell
gear
bridge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110278685.6A
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Chinese (zh)
Inventor
邹海潮
林志鸿
茆凡
刘俊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Changshu Meiqiao Automotive Drive System Manufacturing Technology Co ltd
Original Assignee
Changshu Meiqiao Automotive Drive System Manufacturing Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Changshu Meiqiao Automotive Drive System Manufacturing Technology Co ltd filed Critical Changshu Meiqiao Automotive Drive System Manufacturing Technology Co ltd
Priority to CN202110278685.6A priority Critical patent/CN112848799A/en
Publication of CN112848799A publication Critical patent/CN112848799A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B60B35/16—Axle housings
    • B60B35/163—Axle housings characterised by specific shape of the housing, e.g. adaptations to give space for other vehicle elements like chassis or exhaust system
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/16—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Retarders (AREA)

Abstract

The invention discloses a coaxial insertion tube type electric drive pickup bridge, relates to the technical field of bridge parts of vehicles, and aims to solve the problems that the overall weight of an assembly is heavy due to motor offset, NVH is easily caused due to lack of support of a motor shell, and the support rigidity is poor due to the fact that a bridge tube is connected with an electric drive assembly through bolts. The technical scheme is that the device comprises a first insertion pipe, a first aluminum shell, a second aluminum shell, a third aluminum shell, a fourth aluminum shell and a second insertion pipe, wherein motor output shafts are coaxially arranged in the first insertion pipe and the second insertion pipe; an output end gear is coaxially sleeved on the output shaft of the motor, a helical gear is meshed at one end, close to the second aluminum shell, of the output end gear, a gear shaft is arranged in the center of the helical gear in a penetrating mode, the gear shaft is located in the third aluminum shell, the second aluminum shell and the first aluminum shell, and a differential assembly is meshed on the outer wall of the gear shaft located in the first aluminum shell. The coaxial motor is designed in a light weight mode, the assembly rigidity is increased, the service life is prolonged, and the unsprung mass and the NVH performance are good.

Description

Coaxial type insertion tube type electric drive pickup bridge
Technical Field
The invention relates to the technical field of bridge components of vehicles, in particular to a coaxial insertion tube type electric drive pickup bridge.
Background
The function of a transaxle case on a vehicle is three: firstly, a main speed reducer, a differential mechanism, a half shaft and the like are supported and protected, so that the axial relative positions of a left driving wheel and a right driving wheel are fixed; secondly, the driven axle supports the frame and the mass of each assembly on the frame; in addition, when the automobile runs, the road reaction force and the moment transmitted by the wheels are born and transmitted to the frame through the suspension.
The existing electric drive pickup bridge has the advantages that a motor offset type rear axle assembly is adopted, a bridge pipe is connected with an electric drive assembly through bolts, most of motor housings are made of cast iron, namely, products made of aluminum housings are used, and the bearing capacity of the motor housings is generally poor.
The above prior art solutions have the following drawbacks: the motor offset leads to the assembly bulk weight heavy, and the too big chassis of being unfavorable for arranges, and motor casing lacks the support, causes the NVH problem easily, and the bridge pipe is bolted connection with the electric drive assembly, and support rigidity is poor, because motor casing is cast iron, whole bridge weight overweight leads to unsprung mass overweight, consequently awaits further improvement.
Disclosure of Invention
The invention aims to provide a coaxial insertion tube type electrically-driven pickup bridge which has the effects of lightening the weight of a coaxial motor and improving the rigidity of an assembly.
The technical purpose of the invention is realized by the following technical scheme:
a coaxial insertion tube type electric drive pick-up bridge comprises a first insertion tube, a first aluminum shell in interference fit with the first insertion tube, a second aluminum shell and a third aluminum shell which are fixedly connected with the first aluminum shell in sequence, wherein a welding anchor point is arranged between the first insertion tube and the first aluminum shell; a fourth aluminum shell is fixedly connected to one end, far away from the second aluminum shell, of the third aluminum shell, a second insertion tube is connected to one end, far away from the third aluminum shell, of the fourth aluminum shell in an interference manner, a welding anchor point is arranged between the second insertion tube and the fourth aluminum shell, and motor output shafts are coaxially arranged in the first insertion tube and the second insertion tube; and the output gear is positioned in the third aluminum shell, one end of the output gear, which is close to the second aluminum shell, is meshed with a helical gear, the center of the helical gear is provided with a gear shaft in a penetrating manner, the gear shaft is positioned in the third aluminum shell, the second aluminum shell and the first aluminum shell, and the outer wall of the gear shaft positioned in the first aluminum shell is meshed with a differential assembly.
The invention is further configured to: first bolt is worn to be equipped with on the first aluminum hull, threaded connection is in the third aluminum hull behind the first bolt passes the second aluminum hull, all set up on second aluminum hull and the third aluminum hull with first bolt complex first fixed orifices.
The invention is further configured to: the first bolts are circumferentially arranged at intervals.
The invention is further configured to: the fourth aluminum shell is provided with a second bolt in a penetrating mode, one end, far away from the fourth aluminum shell, of the second bolt is connected to the third aluminum shell in a threaded mode, and the third aluminum shell is provided with a second fixing hole matched with the second bolt.
The invention is further configured to: the second bolts are circumferentially arranged at intervals.
The invention is further configured to: one end of the fourth aluminum shell, which is close to the third aluminum shell, is provided with a first mounting hole for embedding the output end gear, and a first ball bearing is arranged in the first mounting hole; and a second mounting hole for the output end gear to extend out is formed in one end, close to the second aluminum shell, of the third aluminum shell, and a second ball bearing is arranged in the second mounting hole.
The invention is further configured to: the differential mechanism assembly comprises a differential shell meshed with the gear shaft and a rotating gear set arranged in the differential shell, a differential shell end cover is welded at one end of the differential shell in the radial direction, a first clamping groove for placing the differential shell end cover is formed in the first aluminum shell, and a first tapered roller bearing is arranged in the first clamping groove.
The invention is further configured to: the rotating gear set comprises two differential gear main gears and side gears meshed with the differential gear main gears, and each side gear is respectively arranged on one motor output shaft; and a second clamping groove for inserting the end part of the differential shell is formed in the center of the second aluminum shell, and a second tapered roller bearing is arranged in the second clamping groove.
The invention is further configured to: the outer wall of the interference fit position of the first aluminum shell and the first insertion tube is provided with a first reinforcing rib, and the outer wall of the interference fit position of the fourth aluminum shell and the second insertion tube is provided with a second reinforcing rib.
The invention is further configured to: and third conical roller bearings are coaxially arranged at two ends of the gear shaft.
In conclusion, the beneficial technical effects of the invention are as follows:
1. through the arrangement of the first aluminum shell, the second aluminum shell and the third aluminum shell, a sandwich type shell structure formed by the first aluminum shell, the second aluminum shell and the third aluminum shell reduces the space, so that the space of the two-stage helical gear is more compact, the integration level is high, the total weight is light, and the structure has high energy density, high power and large output torque under the same weight;
2. through the arrangement of the first reinforcing ribs and the first bolts, one end of the first aluminum shell is in interference fit with the first insertion pipe, and sufficient torsion resistance is achieved through welding, the first reinforcing ribs above and below the first aluminum shell can improve the overall load capacity of the axle housing, and the first aluminum shell, the second aluminum shell and the third aluminum shell are connected through the first bolts, so that sufficient shearing resistance is obtained on the contact surface of the flange;
3. through the setting of second strengthening rib and second bolt, fourth aluminum hull one end and second intubate interference fit, in addition the welding realizes sufficient antitorque characteristic, and the second strengthening rib about the fourth aluminum hull can further promote the holistic load-carrying capacity of axle housing.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a partial schematic view for showing a four aluminum case connection structure;
fig. 3 is a schematic cross-sectional structure of an embodiment of the present invention.
In the figure, 1, a first aluminum shell; 11. a first cannula; 12. a first bolt; 13. a first reinforcing rib; 2. a second aluminum case; 3. a third aluminum case; 31. a second mounting hole; 32. a second ball bearing; 4. a fourth aluminum case;
41. a second cannula; 42. a second bolt; 43. a first mounting hole; 44. a first ball bearing; 45. a second reinforcing rib; 5. an output shaft of the motor; 6. an output end gear; 61. a helical gear; 62. a gear shaft;
63. a third tapered roller bearing; 7. difference shell; 71. a second clamping groove; 72. a second tapered roller bearing;
8. a differential shell end cover; 81. a first clamping groove; 82. a first tapered roller bearing; 9. a differential main gear; 91. a side gear.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Referring to fig. 1 and 2, the coaxial insertion tube type electric-driven pick-up bridge disclosed by the invention comprises a first insertion tube 11, a first aluminum shell 1 in interference fit with the first insertion tube 11, a second aluminum shell 2 and a third aluminum shell 3 which are sequentially and fixedly connected with the first aluminum shell 1, wherein a first bolt 12 penetrates through the first aluminum shell 1, and a plurality of first bolts 12 are circumferentially arranged at intervals. First bolt 12 passes behind second aluminum hull 2 threaded connection in third aluminum hull 3, all seted up on second aluminum hull 2 and the third aluminum hull 3 with first bolt 12 complex first fixed orifices. Due to the aluminum shell, in order to make the shell have sufficient rigidity, a first reinforcing rib 13 is arranged on the outer wall of the interference fit position of the first aluminum shell 1 and the first insertion tube 11. Reasonable reinforcing ribs are arranged through finite element analysis, and the weight is controlled while the rigidity is ensured. 1 one end of first aluminum hull and 11 interference fit of first intubate to further fixed through four welding anchor points, in addition the welding realizes sufficient antitorque characteristic, and the holistic load capacity of axle housing can be promoted to first strengthening rib 13 about 1 of first aluminum hull. The first aluminum shell 1, the second aluminum shell 2 and the third aluminum shell 3 are connected through the first bolts 12, and sufficient shearing resistance is obtained on the contact surface of the flange. This also requires maintaining good sealing performance with torque output and load bearing through finite element analysis.
Referring to fig. 1 and 2, one end of the third aluminum shell 3 away from the second aluminum shell 2 is fixedly connected with a fourth aluminum shell 4, and one end of the fourth aluminum shell 4 away from the third aluminum shell 3 is in interference connection with a second insertion tube 41 and is further fixed by four welding anchor points. Both ends of the first insertion tube 11 and the second insertion tube 41 are sealed by oil seals to form a closed space. The fourth aluminum shell 4 is provided with a plurality of second bolts 42 in a penetrating manner, and the second bolts 42 are circumferentially arranged at intervals. One end of the second bolt 42, which is far away from the fourth aluminum shell 4, is in threaded connection with the third aluminum shell 3, and a second fixing hole matched with the second bolt 42 is formed in the third aluminum shell 3. The third aluminum shell 3 and the fourth aluminum shell 4 are connected through the second bolts 42, and sufficient shearing resistance is obtained on the flange contact surface. Under the action of the first bolt 12 and the second bolt 42, the connection of four aluminum shells is realized. Due to the aluminum shell, in order to provide sufficient rigidity to the shell, a second reinforcing rib 45 is provided on the outer wall of the interference fit between the fourth aluminum shell 4 and the second insertion tube 41. One end of the fourth aluminum shell 4 is in interference fit with the second insertion tube 41, and in addition, sufficient torsion resistance is realized by welding, and the second reinforcing ribs 45 on the upper portion and the lower portion of the fourth aluminum shell 4 can improve the overall load capacity of the axle housing.
Referring to fig. 1 and 3, the first insertion tube 11 and the second insertion tube 41 are both provided with a motor output shaft 5 coaxially therein. An output end gear 6 is coaxially sleeved on the motor output shaft 5 positioned in the second insertion pipe 41, and the output end gear 6 is positioned in the third aluminum shell 3. The first mounting hole 43 for embedding the output end gear 6 is formed in one end, close to the third aluminum shell 3, of the fourth aluminum shell 4, and the second mounting hole 31 for extending the output end gear 6 is formed in one end, close to the second aluminum shell 2, of the third aluminum shell 3. In order to reduce the abrasion of the output end gear 6 during operation and prolong the service life of the output end gear, a first ball bearing 44 is arranged in the first mounting hole 43, and a second ball bearing 32 is arranged in the second mounting hole 31.
Referring to fig. 1 and 3, one end of the output end gear 6 close to the second aluminum case 2 is engaged with a helical gear 61, and a spline is connected between the output end gear 6 and the helical gear 61. A gear shaft 62 penetrates through the center of the bevel gear 61, the gear shaft 62 is positioned in the third aluminum shell 3, the second aluminum shell 2 and the first aluminum shell 1, and a differential assembly is meshed on the outer wall of the gear shaft 62 in the first aluminum shell 1. The motor output shaft 5 drives the output end gear 6 to rotate, the output end gear 6 drives the bevel gear 61 and the gear shaft 62 to rotate together, and in order to reduce abrasion of the gear shaft 62 during operation and prolong the service life of the gear shaft, the two ends of the gear shaft 62 are coaxially provided with third conical roller bearings 63.
Referring to fig. 1 and 3, a main reduction gear and differential case integrated welded differential has been disclosed in chinese patent No. CN212377235U, and the differential assembly of the present embodiment is identical in structure to the aforementioned patent. The differential assembly comprises a differential shell 7 meshed with the gear shaft 62 and a rotating gear set arranged in the differential shell 7, a differential shell end cover 8 is radially welded at one end of the differential shell 7, a first clamping groove 81 for placing the differential shell end cover 8 is formed in the first aluminum shell 1, and a first tapered roller bearing 82 is arranged in the first clamping groove 81. The rotating gear set comprises two differential main gears 9 and side gears 91 meshed with the differential main gears 9, and each side gear 91 is respectively connected to one motor output shaft 5 in a spline mode; a second clamping groove 71 for inserting the convex part of the differential case 7 is arranged at the center of the second aluminum case 2, and a second tapered roller bearing 72 is arranged in the second clamping groove 71. The output gear 6 is driven by the motor output shaft 5 to rotate, the helical gear 61 and the gear shaft 62 are driven by the output gear 6 to rotate together, and the differential case 7 rotates along with the differential case 7 because the differential case 7 is meshed with the gear shaft 62.
The implementation principle of the embodiment is as follows: through the sandwich type shell structure formed by the first aluminum shell 1, the second aluminum shell 2 and the third aluminum shell 3, the space is reduced, and the space of the two-stage bevel gear can be more compact. The integrated level is high, and the total weight is light, and this kind of structure is under the same weight, and energy density is big, and the power is high, and output torque is big.
1 one end of first aluminum hull and 11 interference fit of first intubate, in addition the welding realizes sufficient antitorque characteristic, and the holistic load capacity of axle housing can be promoted to first strengthening rib 13 about 1 of first aluminum hull. The first aluminum shell 1, the second aluminum shell 2 and the third aluminum shell 3 are connected through the first bolts 12, and sufficient shearing resistance is obtained on the contact surface of the flange.
One end of the fourth aluminum shell 4 is in interference fit with the second insertion tube 41, and in addition, sufficient torsion resistance is realized by welding, and the whole load capacity of the axle housing can be further improved by the second reinforcing ribs 45 arranged on the upper portion and the lower portion of the fourth aluminum shell 4.
The coaxial motor is light in weight, cost is reduced, assembly rigidity is improved, service life is prolonged, and the coaxial motor has good unsprung mass and NVH performance.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. The utility model provides a coaxial-type intubate formula electric drive pick up bridge which characterized in that: the aluminum-clad plate comprises a first insertion pipe (11), a first aluminum shell (1) in interference fit with the first insertion pipe (11), a second aluminum shell (2) and a third aluminum shell (3) which are sequentially and fixedly connected with the first aluminum shell (1), wherein a welding anchor point is arranged between the first insertion pipe (11) and the first aluminum shell (1); a fourth aluminum shell (4) is fixedly connected to one end, far away from the second aluminum shell (2), of the third aluminum shell (3), a second insertion tube (41) is connected to one end, far away from the third aluminum shell (3), of the fourth aluminum shell (4) in an interference fit manner, a welding anchor point is arranged between the second insertion tube (41) and the fourth aluminum shell (4), and motor output shafts (5) are coaxially arranged in the first insertion tube (11) and the second insertion tube (41); lie in second intubate (41) coaxial cover is equipped with output gear (6) on motor output shaft (5), output gear (6) are located third aluminum hull (3), the one end meshing that output gear (6) are close to second aluminum hull (2) has helical gear (61), gear shaft (62) are worn to be equipped with in the center department of helical gear (61), gear shaft (62) are located third aluminum hull (3), second aluminum hull (2), first aluminum hull (1), and the meshing has differential mechanism subassembly on the outer wall of gear shaft (62) that lie in first aluminum hull (1).
2. The coaxial jack-type electrically driven pick-up bridge of claim 1, wherein: wear to be equipped with first bolt (12) on first aluminum hull (1), threaded connection is in third aluminum hull (3) behind second aluminum hull (2) is passed in first bolt (12), all offer on second aluminum hull (2) and third aluminum hull (3) with first bolt (12) complex first fixed orifices.
3. A coaxial jack-type electrically driven pick-up bridge as defined in claim 2, wherein: the first bolts (12) are circumferentially arranged at intervals.
4. The coaxial jack-type electrically driven pick-up bridge of claim 1, wherein: a second bolt (42) penetrates through the fourth aluminum shell (4), one end, far away from the fourth aluminum shell (4), of the second bolt (42) is connected to the third aluminum shell (3) in a threaded mode, and a second fixing hole matched with the second bolt (42) is formed in the third aluminum shell (3).
5. The coaxial jack-tube type electrically driven pick-up bridge as claimed in claim 4, wherein: the second bolts (42) are circumferentially arranged at intervals.
6. The coaxial jack-type electrically driven pick-up bridge of claim 1, wherein: one end, close to the third aluminum shell (3), of the fourth aluminum shell (4) is provided with a first mounting hole (43) for embedding the output end gear (6), and a first ball bearing (44) is arranged in the first mounting hole (43); and a second mounting hole (31) for the output end gear (6) to extend out is formed in one end, close to the second aluminum shell (2), of the third aluminum shell (3), and a second ball bearing (32) is arranged in the second mounting hole (31).
7. The coaxial jack-type electrically driven pick-up bridge of claim 1, wherein: the differential mechanism assembly comprises a differential shell (7) meshed with a gear shaft (62) and a rotating gear set arranged in the differential shell (7), a differential shell end cover (8) is welded to one end of the differential shell (7) in the radial direction, a first clamping groove (81) for the differential shell end cover (8) to be placed is formed in the first aluminum shell (1), and a first tapered roller bearing (82) is arranged in the first clamping groove (81).
8. The coaxial jack-type electrically driven pick-up bridge of claim 7, wherein: the rotating gear set comprises two differential main gears (9) and side gears (91) meshed with the differential main gears (9), and each side gear (91) is arranged on one motor output shaft (5) respectively; a second clamping groove (71) for inserting the end part of the differential shell (7) is formed in the center of the second aluminum shell (2), and a second tapered roller bearing (72) is arranged in the second clamping groove (71).
9. The coaxial jack-type electrically driven pick-up bridge of claim 1, wherein: be provided with first strengthening rib (13) on the outer wall of the interference fit department of first aluminum hull (1) and first intubate (11), be provided with second strengthening rib (45) on the outer wall of the interference fit department of fourth aluminum hull (4) and second intubate (41).
10. The coaxial jack-type electrically driven pick-up bridge of claim 1, wherein: and both ends of the gear shaft (62) are coaxially provided with third conical roller bearings (63).
CN202110278685.6A 2021-03-15 2021-03-15 Coaxial type insertion tube type electric drive pickup bridge Pending CN112848799A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110278685.6A CN112848799A (en) 2021-03-15 2021-03-15 Coaxial type insertion tube type electric drive pickup bridge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110278685.6A CN112848799A (en) 2021-03-15 2021-03-15 Coaxial type insertion tube type electric drive pickup bridge

Publications (1)

Publication Number Publication Date
CN112848799A true CN112848799A (en) 2021-05-28

Family

ID=75994553

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110278685.6A Pending CN112848799A (en) 2021-03-15 2021-03-15 Coaxial type insertion tube type electric drive pickup bridge

Country Status (1)

Country Link
CN (1) CN112848799A (en)

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