CN211335435U - Double-motor integrated two-gear AMT double-speed parallel shaft secondary belt wheel side speed reduction electric drive axle - Google Patents
Double-motor integrated two-gear AMT double-speed parallel shaft secondary belt wheel side speed reduction electric drive axle Download PDFInfo
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- CN211335435U CN211335435U CN201921543137.6U CN201921543137U CN211335435U CN 211335435 U CN211335435 U CN 211335435U CN 201921543137 U CN201921543137 U CN 201921543137U CN 211335435 U CN211335435 U CN 211335435U
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Abstract
The utility model discloses a two integrated fender AMT double speed parallel shaft second grade band pulleys limit speed reduction electricity of bi-motor drive axle. Belongs to the technical field of new energy vehicles. It solves current drive axle of electricity and has the motor to generate heat great and occupy the problem that chassis structural arrangement space. It is mainly characterized in that: the device comprises a first motor, a second motor, a speed reducer, an AMT assembly, a differential mechanism, a wheel reduction gear, a first half shaft and a second half shaft; the reducer comprises a primary driving gear and a secondary primary reducing driven gear which are meshed, a primary driving gear and a primary reducing driven gear which are meshed, and two secondary reducer driving wheels and two secondary reducing driven wheels which are meshed; the first motor, the second-stage reduction driven wheel and the differential are arranged by adopting parallel shafts. The utility model has the characteristics of the coaxial compact design of structure, transmission efficiency are high, be convenient for chassis structural arrangement, the dead weight is light and improve whole car economic nature, and the second grade speed reduction electricity that mainly used bi-motor integration two kept off AMT double speed parallel shaft output drives the transaxle.
Description
Technical Field
The utility model belongs to the technical field of new energy automobile. In particular to a double-motor integrated two-gear AMT double-speed parallel shaft output two-stage belt wheel side speed reduction electric drive axle.
Background
With the development of science and technology and the requirements of environmental protection and energy conservation, the development of the power chain of the whole vehicle is changed from the original engine, the gearbox and the traditional axle into the currently adopted motor and the transmission axle to provide power, and most manufacturers adopt an external single-motor structure at present. The structure is limited by factors such as motor power, an efficient working area and the like, the cost is too high under the condition of higher bearing, the heat generated by the motor is increased, the service life of the motor is influenced and the like; the size of each part is large, the number of the parts is large, the integration level is too low, the arrangement space of a chassis structure is occupied, the arrangement number of batteries and the transmission efficiency are influenced, and the driving range of the vehicle is short; the power performance and the economical efficiency of the whole vehicle are hardly considered.
Disclosure of Invention
In order to overcome the not enough of above-mentioned prior art, the utility model provides a two integrated fender AMT double speed parallel shaft output second grade band pulley limit speed reduction electricity drive axle of bi-motor.
In order to achieve the above object, the utility model adopts the following technical solutions: the utility model provides an integrated two fender AMT double speed parallel shaft output secondary band pulley limit speed reduction electricity of bi-motor drives transaxle, includes first motor, reduction gear, differential mechanism, first semi-axis and second semi-axis, its characterized in that: the two-gear AMT assembly is arranged on the wheel hub of the vehicle; the speed reducer comprises two groups of meshed primary driving gears and two groups of meshed secondary primary speed reducing driven gears, two groups of meshed primary driving gears and one-gear primary speed reducing driven gears, two meshed secondary speed reducer driving wheels and one secondary speed reducing driven gear, and two synchronizers, wherein the two groups of primary speed reducer driving wheels, the one-gear primary speed reducing driven gear, the two groups of secondary speed reducer primary speed reducing driven gears, the synchronizers and the two-gear AMT are coaxially arranged; the first motor shaft of the first motor is integrated with two primary driving gears, and the second motor shaft of the second motor is integrated with the other two primary driving gears; the first motor, the second motor, the secondary speed reduction driven wheel and the differential are arranged in a parallel shaft mode; the outer end parts of the first half shaft and the second half shaft are respectively connected with a hub reduction gear.
The utility model discloses a technical solution in the output of first motor respectively with the spline toothing of two one-level driving gears, the output of second motor and the spline toothing of two other one-level driving gears.
The technical solution of the utility model in the first motor be the driving motor of the same model with the second motor.
The technical proposal of the utility model is that the secondary speed reduction driven wheel and the differential mechanism are integrated to form a secondary speed reduction driven wheel and a differential mechanism; the secondary speed reduction driven wheel and the differential are respectively connected with the first half shaft and the second half shaft through meshing sleeve splines.
The technical solution of the utility model in the wheel reduction gear include planetary gear and planet carrier, set up respectively in first wheel and second wheel.
The technical solution of the utility model in first motor and second motor for the vertical plane mirror symmetry at first semi-axis and second semi-axis place distribute.
The technical solution of the utility model in one keep off one-level speed reduction driven gear, keep off one-level speed reduction driven gear and two fender AMT assembly integrated design, two keep off AMT assembly output shaft and second grade reduction gear action wheel integrated design.
The technical solution of the utility model in the motor shaft of first motor, second motor respectively with corresponding two fender AMT assemblies the moment of torsion input hookups, two keep off the moment of torsion output and the second reduction gear action wheel hookups of AMT assemblies.
The first motor and the second motor in the technical solution of the utility model are driving motors with the same model; the secondary speed reduction driven wheel and the differential are designed integrally to form a secondary speed reduction driven wheel and a differential; the secondary speed reduction driven wheel and the differential are respectively in splined connection with the first half shaft and the second half shaft through meshing sleeves; the wheel-side speed reducer comprises a planetary gear and a planetary carrier which are respectively arranged in a first wheel and a second wheel; the first motor and the second motor are distributed in a mirror symmetry mode relative to a vertical plane where the first half shaft and the second half shaft are located; the first-gear first-stage reduction driven gear, the second-gear first-stage reduction driven gear and the two-gear AMT assembly are integrally designed, and an output shaft of the two-gear AMT assembly and a driving wheel of the second-stage speed reducer are integrally designed; and motor shafts of the first motor and the second motor are respectively connected with the torque input ends of the two-gear AMT assembly, and the torque output ends of the two-gear AMT assembly are connected with the driving wheel of the secondary speed reducer.
The utility model discloses a bi-motor is as the power supply, with motor shaft and one-level speed reduction driving gear design as an organic whole. When the first gear (low gear) works, the first gear (low gear) and the second gear driven wheel are connected with the differential mechanism through the meshing sleeve spline, the first gear (low gear) and the second gear are transmitted to the planetary gear of the hub reduction gear through the half shaft, the planetary gear drives the planet carrier, the planet carrier is connected to the wheel, the wheel is driven to rotate, the first gear (low gear) power transmission is realized, and at the moment, the second gear (high gear) and the differential mechanism slide through the roller pins between the first gear (low gear) and the second gear (high gear). When the two-gear (high gear) works, the two-gear (high gear) secondary driven wheel and the differential mechanism are connected together through the three parts of the meshing sleeve spline and are transmitted to the planetary gear of the hub reduction gear through the half shaft, the planetary gear drives the planetary carrier, the planetary carrier is connected to the wheel and drives the wheel to rotate, the two-gear (high gear) power transmission is realized, and at the moment, the one-gear (low gear) secondary driven cylindrical gear and the differential mechanism slide through the roller pins between the two. The utility model discloses a two pairs of gears are evenly arranged from top to bottom, have realized the power reposition of redundant personnel, have effectively reduced the gear specification. The trafficability characteristic of the whole vehicle is improved. The utility model discloses a biax is arranged, makes reduction gear spatial structure arrange more rationally, arranges differential mechanism between two driven gear of two-stage reduction, and spatial arrangement is further compact ingenious. The utility model discloses two switch that keep off the position, control about driving the meshing cover through the motor promotion declutch shift lever, keep off driven cylindrical gear meshing with one respectively through the spline, realized shifting and the transmission of power, make the motor work in higher high-efficient district all the time, promoted whole car efficiency. The utility model discloses a wheel limit reduction gears has reduced wheel base length. The utility model discloses a motor, reduction gear transversal arrangement have saved the chassis space for whole car can arrange more batteries, has improved the continuation of the journey mileage of whole car.
Compared with the prior art, the utility model, have the coaxial compact design of structure, characteristics that transmission efficiency is high, the chassis structural arrangement of being convenient for, the dead weight is light, improve whole car economic nature and dynamic, the overheated scheduling problem that brings in the greatly reduced high-power motor use makes the better different operating modes of adaptation of whole car. The utility model discloses mainly used two integrated two fender AMT double speed parallel shaft output second grade band pulley limit speed reduction electricity of bi-motor drives the transaxle.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1-a first motor, 2-a first motor shaft and a primary driving gear, 3-a first second first reduction driven gear, 4-a first reduction driven gear, 5-a first synchronizer, 6-a first second reduction driving gear, 7-a second reduction driven gear and a differential, 8-a second motor, 9-a second motor shaft and a primary driving gear, 10-a second first reduction driven gear, 11-a second first reduction driven gear, 12-a second synchronizer, 13-a second reduction driving gear, 14-a first half shaft, 15-a second half shaft, 16-a first wheel, 17-a second wheel, 18-a first planetary gear, 19-a second planetary gear, 20-a first planet carrier, 21-a third planetary gear, 22-fourth planet gear, 23-second planet carrier.
Detailed Description
As shown in fig. 1, the utility model relates to a two integrated two fender AMT double speed parallel shaft output second grade band pulley limit speed reduction electricity drive axle of bi-motor, including first motor 1, second motor 8, reduction gear, AMT assembly, differential mechanism, wheel reduction gear, first semi-axis 14, second semi-axis 15, first wheel 16 and second wheel 17. Wherein, the reduction gear includes engaged first primary driving gear and first second gear one-level reduction driven gear 3, engaged second one-level driving gear and first one-level reduction driven gear 4, engaged third one-level driving gear and second gear one-level reduction driven gear 10, engaged fourth one-level driving gear and second first gear one-level reduction driven gear 11, with first second gear reduction driving gear 6 and second gear reduction driving gear 13 engaged second grade reduction driven wheel, and first synchronizer 5 and second synchronizer 12. Wherein, first second reduction gear action wheel 6, first one-step one-level speed reduction driven gear 4, first one-step one-level speed reduction driven gear 3, first synchronous ware 5 and one two keep off the coaxial setting of AMT assembly, and second reduction gear action wheel 13, first one-step speed reduction driven gear 11, the second keep off one-level speed reduction driven gear 10, second synchronous ware 12 and another two keep off the coaxial setting of AMT assembly. The first motor shaft of the first motor 1 is integrated with the first primary driving gear and the second primary driving gear to form a first motor shaft and a primary driving gear 2. And a second motor shaft of the second motor 8 is integrated with the third-stage driving gear and the fourth-stage driving gear to form a second motor shaft and a first-stage driving gear 9. The output end of the first motor 1 is respectively meshed with splines of the first primary driving gear and the second primary driving gear, and the output end of the second motor 8 is meshed with splines of the third primary driving gear and the fourth primary driving gear. The first motor 1 and the second motor 8 are drive motors of the same type. The sum of the power of the first motor 1 and the power of the second motor 8 is equal to the power of the existing single motor, so that the size and the mass of the first motor 1 and the second motor 8 can be relatively small, the chassis structure space balance arrangement is facilitated, the arrangement number of batteries is not influenced, and the heating is reduced. The first motor 1, the second motor 8, the second-stage reduction driven wheel and the differential mechanism are arranged by adopting parallel shafts. The wheel reduction comprises planetary gears and a planetary carrier, wherein a first planetary gear 18, a second planetary gear 19 and a first planetary carrier 20 are arranged in the first wheel 16, and a third planetary gear 21, a fourth planetary gear 22 and a second planetary carrier 23 are arranged in the second wheel 17. After power is output and is decelerated by the secondary planet wheel, the power is decelerated by the secondary wheel-side planet wheel and transmitted to wheels, and the rotating speed advantage of the motor can be well played. The outer ends of the first axle shaft 14 and the second axle shaft 15 are connected to a hub reduction gear, respectively. The secondary speed reduction driven wheel and the differential mechanism are designed integrally to form a secondary speed reduction driven wheel and a differential mechanism 7, and the secondary speed reduction driven wheel and the differential mechanism 7 are connected with the first half shaft 14 and the second half shaft 15 through meshing sleeve splines respectively. The first electric machine 1 and the second electric machine 8 are arranged in mirror symmetry with respect to a vertical plane in which the first half shaft 14 and the second half shaft 15 are located, i.e. the first electric machine 1 and the second electric machine 8 have the same horizontal height, and the first electric machine 1 and the second electric machine 8 have the same distance from the half shafts. First one-step one-level reduction driven gear 4, first second gear one-level reduction driven gear 3 and first two keep off AMT assembly integrated design, and the second keeps off one-level reduction driven gear 11, second two one-level reduction driven gear 10, keeps off AMT assembly integrated design with second two, and two keep off AMT assembly output shafts respectively with first second gear reduction driving gear 6, second reduction gear driving wheel 1, 3 integrated design. The motor shafts of the first motor 1 and the second motor 8 are respectively connected with the torque input ends of the corresponding AMT assemblies, and the torque output ends of the AMT assemblies are respectively connected with the driving wheel 6 of the first secondary speed reducer and the driving gear 13 of the second secondary speed reducer.
The utility model discloses a first motor 1, second motor 8 and second grade speed reduction adopt the parallel axis to arrange from driving wheel and differential mechanism 7. The first motor shaft and the first-stage driving gear 2, the second motor shaft and the first-stage driving gear 9 are integrally designed, namely, the first motor shaft and the first-stage driving gear are used as a motor output shaft and are also used as a first-stage speed reduction input driving gear. Two grades of AMTs are integrated to one-level driven gear department, and two grades of driven gears and differential mechanism integrated design.
During normal operation, the first motor shaft and the first-level driving gear 2, the second motor shaft and the first-level driving gear 9 drive the first second first-level deceleration driven gear 3, the second-level deceleration driven gear 10, the first-level deceleration driven gear 4 and the second first-level deceleration driven gear 11, the first-level deceleration driven gear 4 and the second first-level deceleration driven gear 11, the first second first-level deceleration driven gear 3 and the second-level deceleration driven gear 10, the first second-level reducer driving wheel 6 and the second-level deceleration driving gear 13 to drive the second-level deceleration driven wheel and the differential mechanism 7 through the spline fit of the first synchronizer 5 and the second synchronizer 12, transmit power to the first half shaft 14 and the second half shaft 15, and transmit the power to the first, second, third and fourth planetary gears 18 of the wheel-side reducer through the first half shaft 14 and the second half shaft 15, 19. 21, 22, the first, second, third and fourth planetary gears 18, 19, 21, 22 drive the first and second planetary gears 20, 23, the first and second planetary gears 20, 23 are connected to the first and second wheels 16, 17, drive the first and second wheels 16, 17 to rotate, so that the power is transmitted from the motor to the wheels.
In the first-gear operation, the first synchronizer 5 and the second synchronizer 12 are engaged with the first second-gear first-stage reduction driven gear 3, the second motor shaft and the first-stage driving gear 9, power of the first-gear first-stage reduction driven gear 4 and the second-gear first-stage reduction driven gear 10 is transmitted to the second-stage reduction driven gear and the differential 7, power is transmitted to the first half shaft 14 and the second half shaft 15, the power is transmitted to the first, second, third and fourth planetary gears 18, 19, 21 and 22 of the wheel-side reduction gear through the first half shaft 14 and the second half shaft 15, the first, second, third and fourth planetary gears 18, 19, 21 and 22 drive the first and second planetary carriers 20 and 23, the first and second planetary carriers 20 and 23 are connected to the first and second wheels 16 and 17, and the first wheel 16 and the second wheel 17 are driven to rotate, so that power is transmitted from the motor to the wheels.
In the second gear operation, the first synchronizer 5 and the second synchronizer 12 are engaged with the first gear first-stage reduction driven gear 4 and the second gear first-stage reduction driven gear 10, the power of the first second gear first-stage reduction driven gear 3, the second motor shaft and the first driving gear 9 is transmitted to the second-stage reduction driven gear and the differential mechanism 7, the power is transmitted to the first half shaft 14 and the second half shaft 15, the power is transmitted to the first, second, third and fourth planetary gears 18, 19, 21 and 22 of the wheel-side speed reducer through the first half shaft 14 and the second half shaft 15, the first, second, third and fourth planetary gears 18, 19, 21 and 22 drive the first and second planetary carriers 20 and 23, the first and second planetary carriers 20 and 23 are connected to the first and second wheels 16 and 17, and drive the first wheel 16 and the second wheel 17 to rotate, so that the power is transmitted from the motor to the wheels.
Because the secondary speed reduction driven wheel and the differential mechanism 7 are not provided with power coupling devices, the output speeds of the two motors to the driven wheel are ensured to be the same in the normal running process; due to the existence of the two synchronizers, the two motors can be shifted at different times, and the smoothness during shifting is improved.
The electric drive axle of the utility model adopts double motors, two-stage speed reduction and parallel shaft arrangement; meanwhile, a two-gear AMT is integrated in the secondary speed reducing part. The compact structural arrangement can reduce the use of a high-power motor, reasonably utilize the high-efficiency area of the motor, reduce the cost, shorten a transmission chain, improve the efficiency, reduce the occupied space of an axle, reduce the weight of the whole axle, increase the battery capacity of a carriage and improve the driving range of the vehicle.
Claims (9)
1. The utility model provides an integrated two fender AMT double speed parallel shaft second grade band pulley limit speed reduction electricity of bi-motor drives transaxle, includes first motor (1), reduction gear, differential mechanism, first semi-axis (14) and second semi-axis (15), its characterized in that: the gear transmission mechanism further comprises a second motor (8), a wheel reduction gear and two sets of two-gear AMT assemblies; the speed reducer comprises two groups of meshed primary driving gears and two groups of meshed secondary primary speed reducing driven gears, two groups of meshed primary driving gears and one-gear primary speed reducing driven gears, two meshed secondary speed reducer driving wheels and one secondary speed reducing driven gear, and two synchronizers, wherein the two groups of primary speed reducer driving wheels, the one-gear primary speed reducing driven gear, the two groups of secondary speed reducer primary speed reducing driven gears, the synchronizers and the two-gear AMT are coaxially arranged; a first motor shaft of the first motor (1) is integrated with two primary driving gears, and a second motor shaft of the second motor (8) is integrated with the other two primary driving gears; the first motor (1), the second motor (8), the secondary speed reduction driven wheel and the differential are arranged in a parallel shaft manner; the outer end parts of the first half shaft (14) and the second half shaft (15) are respectively connected with a hub reduction gear.
2. The dual-motor integrated two-gear AMT double-speed parallel shaft secondary pulley edge speed reduction electric drive axle according to claim 1, characterized in that: the output end of the first motor (1) is respectively meshed with the splines of the two first-stage driving gears, and the output end of the second motor (8) is meshed with the splines of the other two first-stage driving gears.
3. The dual-motor integrated two-gear AMT double-speed parallel shaft secondary pulley edge speed reduction electric drive axle according to claim 1 or 2, characterized in that: the first motor (1) and the second motor (8) are driving motors with the same model.
4. The dual-motor integrated two-gear AMT double-speed parallel shaft secondary pulley edge speed reduction electric drive axle according to claim 1 or 2, characterized in that: the secondary speed reduction driven wheel and the differential are designed integrally to form a secondary speed reduction driven wheel and a differential (7); the secondary speed reduction driven wheel and the differential (7) are respectively connected with the first half shaft (14) and the second half shaft (15) through meshing sleeve splines.
5. The dual-motor integrated two-gear AMT double-speed parallel shaft secondary pulley edge speed reduction electric drive axle according to claim 1 or 2, characterized in that: the hub reduction gear comprises a planetary gear and a planet carrier which are respectively arranged in a first wheel (16) and a second wheel (17).
6. The dual-motor integrated two-gear AMT double-speed parallel shaft secondary pulley edge speed reduction electric drive axle according to claim 1 or 2, characterized in that: the first motor (1) and the second motor (8) are distributed in a mirror symmetry mode relative to a vertical plane where the first half shaft (14) and the second half shaft (15) are located.
7. The dual-motor integrated two-gear AMT double-speed parallel shaft secondary pulley edge speed reduction electric drive axle according to claim 1 or 2, characterized in that: one keep off one-level reduction driven gear, keep off one-level reduction driven gear and two and keep off AMT assembly integrated design, two keep off AMT assembly output shaft and second reduction gear action wheel integrated design.
8. The dual-motor integrated two-gear AMT double-speed parallel shaft secondary pulley edge speed reduction electric drive axle according to claim 1 or 2, characterized in that: and motor shafts of the first motor (1) and the second motor (8) are respectively connected with the torque input ends of the two-gear AMT assembly, and the torque output ends of the two-gear AMT assembly are connected with the driving wheel of the secondary speed reducer.
9. The dual-motor integrated two-gear AMT double-speed parallel shaft secondary pulley edge speed reduction electric drive axle according to claim 1 or 2, characterized in that: the first motor (1) and the second motor (8) are driving motors with the same model; the secondary speed reduction driven wheel and the differential are designed integrally to form a secondary speed reduction driven wheel and a differential (7); the secondary speed reduction driven wheel and the differential (7) are respectively in spline connection with a first half shaft (14) and a second half shaft (15) through meshing sleeves; the wheel-side reducer comprises a planetary gear and a planet carrier which are respectively arranged in a first wheel (16) and a second wheel (17); the first motor (1) and the second motor (8) are distributed in a mirror symmetry mode relative to a vertical plane where the first half shaft (14) and the second half shaft (15) are located; the first-gear first-stage reduction driven gear, the second-gear first-stage reduction driven gear and the two-gear AMT assembly are integrally designed, and an output shaft of the two-gear AMT assembly and a driving wheel of the second-stage speed reducer are integrally designed; and motor shafts of the first motor (1) and the second motor (8) are respectively connected with the torque input ends of the two-gear AMT assembly, and the torque output ends of the two-gear AMT assembly are connected with the driving wheel of the secondary speed reducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921543137.6U CN211335435U (en) | 2019-09-17 | 2019-09-17 | Double-motor integrated two-gear AMT double-speed parallel shaft secondary belt wheel side speed reduction electric drive axle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921543137.6U CN211335435U (en) | 2019-09-17 | 2019-09-17 | Double-motor integrated two-gear AMT double-speed parallel shaft secondary belt wheel side speed reduction electric drive axle |
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| CN211335435U true CN211335435U (en) | 2020-08-25 |
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| CN201921543137.6U Active CN211335435U (en) | 2019-09-17 | 2019-09-17 | Double-motor integrated two-gear AMT double-speed parallel shaft secondary belt wheel side speed reduction electric drive axle |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112046202A (en) * | 2020-09-04 | 2020-12-08 | 中国重汽集团济南动力有限公司 | Three-stage speed reduction double-axle for heavy-duty mining vehicle and transmission method |
| CN112356647A (en) * | 2020-11-10 | 2021-02-12 | 浙江吉利控股集团有限公司 | Multi-motor flexible torque centralized driving synthesis box and electric vehicle |
| CN112477570A (en) * | 2020-12-15 | 2021-03-12 | 浙江吉利控股集团有限公司 | Drive synthesis device and electric vehicle |
| CN112659871A (en) * | 2021-01-19 | 2021-04-16 | 中国重汽集团济南动力有限公司 | Double-motor gear reduction drive axle assembly with wheel-side reduction mechanism |
-
2019
- 2019-09-17 CN CN201921543137.6U patent/CN211335435U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112046202A (en) * | 2020-09-04 | 2020-12-08 | 中国重汽集团济南动力有限公司 | Three-stage speed reduction double-axle for heavy-duty mining vehicle and transmission method |
| CN112356647A (en) * | 2020-11-10 | 2021-02-12 | 浙江吉利控股集团有限公司 | Multi-motor flexible torque centralized driving synthesis box and electric vehicle |
| CN112477570A (en) * | 2020-12-15 | 2021-03-12 | 浙江吉利控股集团有限公司 | Drive synthesis device and electric vehicle |
| CN112477570B (en) * | 2020-12-15 | 2022-11-29 | 浙江吉利控股集团有限公司 | Drive synthesis device and electric vehicle |
| CN112659871A (en) * | 2021-01-19 | 2021-04-16 | 中国重汽集团济南动力有限公司 | Double-motor gear reduction drive axle assembly with wheel-side reduction mechanism |
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