CN102734391A - Machinery torque converter - Google Patents
Machinery torque converter Download PDFInfo
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- CN102734391A CN102734391A CN2012101871405A CN201210187140A CN102734391A CN 102734391 A CN102734391 A CN 102734391A CN 2012101871405 A CN2012101871405 A CN 2012101871405A CN 201210187140 A CN201210187140 A CN 201210187140A CN 102734391 A CN102734391 A CN 102734391A
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- brake drum
- bevel
- torque converter
- wheel carrier
- planet gear
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Abstract
The invention discloses a machinery torque converter which comprises an input bevel gear, an output bevel gear, a brake, a planetary gear carrier, a plurality of planetary bevel gears and planetary bevel gear shafts; the plurality of planetary bevel gears are pivotally fixed on the outer edge of the planetary gear carrier respectively by the planetary bevel gear shafts along with the radial direction of the planetary gear carrier; the input bevel gear is meshed with the plurality of planetary bevel gears at one side of the planetary gear carrier; the output bevel gear is meshed with the plurality of planetary bevel gears at the other side of the planetary gear carrier; teeth number of the input bevel gear is equal to that of the output bevel gear; and eth brake is used for limiting the rotation of the planetary gear carrier. The machinery torque converter can be applied to automatic transmissions, and is high in driving efficiency, compact in structure, easy to attach and detach, and convenient to maintain.
Description
Technical field
The present invention relates to automobile-used machinery, particularly a kind of mechanical torque converter, this kind mechanical torque converter can be applied to automatic transmission.
Background technique
The automobile of automatic catch is not owing to have clutch between motor and the automatic transmission, and the connection between them normally realizes by fluid torque converter.The effect one of fluid torque converter is to transmit rotating speed and moment of torsion, the 2nd, make between motor and the automatic transmission be connected to become nonrigid to make things convenient for the automatic transmission self shifter.
After the engine power output, drive pump impeller, pump impeller stirs the automatic transmission fluid (ATF) in the fluid torque converter, drives turbine rotation; ATF is a circuit action in the torque-converters housing, the centrifugal force during owing to the pump impeller rotation, and ATF can be under the effect of pump impeller; Get rid of laterally, rush at the turbine in the place ahead, flow to shaft core position again; Get back to pump impeller one side, the circulation that so goes round and begins again passes power to the turbine that is connected with gear-box.
Guide wheel is parts that are present between pump impeller and the turbine, is used for adjustment housings ATF flow direction, prevents that ATF from impacting with the pump impeller sense of rotation when pump impeller is returned in recirculation through turbine mutually on the contrary.When pump impeller and secondary speed difference were big, the moment of torsion of power output had also become greatly, and the suitable stepless speed variator of fluid torque converter of this moment promotes moment of torsion through speed discrepancy, and this moment, guide wheel was in stationary state, refluxed in order to regulate ATF; And when the speed discrepancy reduction, when coupling of turbine pump impeller or locking, moment of torsion need not to increase square near equity, and guide wheel rotates with pump impeller and turbine in the same way, avoids self stirring ATF, causes the loss of power.
Fluid torque converter; To promote turbine rotation at a high speed, flow is also impacted guide wheel to liquid simultaneously, makes output torque greater than input torque from pump impeller; Can realize increasing turning round through hydraulic moment changeable makes automobile from static gentle start during to low speed; And in accelerating process, when big power is exported, also can play the effect that increases moment of torsion.
Turn round effect though fluid torque converter can be realized increasing, have following shortcoming:
1. transmission efficiency is low, and kinetic equation loss is more.Fluid torque converter is to come transmitting torque through flow, and flow transmitting torque loss significant amount of energy, so the transmission efficiency of fluid torque converter is low.
2. radial dimension is bigger.In order to satisfy high-power transmission requirement, the common radial dimension of fluid torque converter is bigger, is unfavorable for realizing the lightweight and the miniaturization production of torque-converters like this.
3. inconvenient maintenance, maintenance cost is high.Fluid torque converter is an integral body, and is on-dismountable.Need cut with Special Equipment during maintenance, and need carry out high-precision location and welding after the maintenance, technological requirement is very high, and difficulty is big, and maintenance cost is high.
Summary of the invention
The technical problem that the present invention will solve provides a kind of mechanical torque converter, can be applied to automatic transmission, and transmission efficiency is high, compact structure, and easy disassembling, easy to maintenance.
For solving the problems of the technologies described above, the invention provides a kind of mechanical torque converter, it comprises an input bevel gear, an output bevel gear, a break, a planetary wheel carrier, a plurality of bevel planet gear and bevel planet gear axle;
Said a plurality of bevel planet gear, through the bevel planet gear axle, the radially pivot that follows star wheel frame is fixed in the planetary wheel carrier outer rim respectively;
Said input bevel gear is in a side and said a plurality of bevel planet gear engagement of said planetary wheel carrier;
Said output bevel gear is in opposite side and said a plurality of bevel planet gear engagement of said planetary wheel carrier;
Said input bevel gear is identical with said output number of teeth in bevel gears and hypoid gears;
Said break is used for limiting the rotation of planetary wheel carrier.
Said break can comprise a brake drum, a clamping strap, a brake actuator;
Said brake drum is ring, and its inner rim radially is distributed with a plurality of round holes;
Said planetary wheel carrier, its outer rim is corresponding with said brake drum radially to be distributed with a plurality of round holes, and said planetary wheel carrier is fixed in the said brake drum;
Said a plurality of bevel planet gear is fixed between the corresponding round hole on said brake drum and the planetary wheel carrier through bevel planet gear axle pivot respectively;
Said clamping strap is arranged on said brake drum outer rim;
Said brake actuator links to each other with said clamping strap, is used to drive said clamping strap and compresses or unclamp said brake drum outer rim.
The outer fringe surface of said brake drum can scribble friction material.
Said brake actuator, two link arms that the length that can have is different;
Said clamping strap can comprise the first arc band, the second arc band, clamping strap stationary axle;
Said clamping strap stationary axle is used for fixing on the automatic speed changing tank shell;
One end of the said first arc band, the second arc band is fixed in together through clamping strap stationary axle pivot, and the other end of the first arc band, the second arc band is fixed together with two different link arm pivots of the length of said brake actuator respectively.
Said brake drum can comprise outer shroud brake drum, interior ring brake drum;
The internal diameter on said outer shroud brake drum top is less than the internal diameter of bottom, and is formed with a plurality of semi-circular recesses vertically at the same abut lower place on top;
Ring brake drum in said; Its internal diameter equals the internal diameter on said outer shroud brake drum top; Its external diameter is smaller or equal to the internal diameter of said outer shroud brake drum bottom, said in ring brake drum one side be formed with vertically with said outer shroud brake drum top on the corresponding a plurality of semi-circular recesses of a plurality of semi-circular recesses;
Encircle brake drum and the amalgamation of said outer shroud brake drum in said together, a plurality of semi-circular recesses of said interior ring brake drum one side constitute a plurality of round hole that the brake drum inner edge radially distributes jointly with a plurality of semi-circular recesses on the said outer shroud brake drum top.
The number of bevel planet gear and bevel planet gear axle can be 2,34,5 or 6.
Preferable, said a plurality of bevel planet gears, evenly pivot is fixed in the planetary wheel carrier outer rim.
Mechanical torque converter of the present invention, the input bevel gear is used for linking to each other with the motor output terminal, receives Engine torque; The output bevel gear is used for linking to each other with the input shaft of automatic transmission, and moment of torsion is exported to automatic transmission; A plurality of bevel planet gears and the engagement of input bevel gear, and while and the engagement of output bevel gear pass to the output bevel gear with Engine torque by the input bevel gear; Said a plurality of bevel planet gear is uniformly distributed with and is fixed on the said planetary wheel carrier, can rotation, also can revolve round the sun with planetary wheel carrier; Said brake drum connects the fixed one that is with said planetary wheel carrier; The automatic transmission housing is fixed on said clamping strap top; The bottom links to each other with brake actuator, and said brake actuator makes clamping strap and brake drum produce friction to a certain degree through the tension clamping strap; And then to brake drum generation friction torque, the rotation of restriction planetary wheel carrier; When brake drum was braked band and brakes fully, planetary wheel carrier is fixing not to rotate, because the input bevel gear is identical with the output number of teeth in bevel gears and hypoid gears, exporting the bevel gear output torque is Engine torque; When brake drum was partly braked, planetary wheel carrier was by the affix friction torque, and the moment of torsion of output bevel gear output is an Engine torque friction torque sum therewith, thereby can increase square through regulating this friction torque size; When clamping strap was not braked brake drum, planetary wheel carrier can freely rotate, and the output bevel gear is output torque not.Like this, when the automobile speed stabilizing was gone, clamping strap was braked brake drum fully; Engine torque is directly passed to automatic transmission, and when vehicle starting, clamping strap is partly braked brake drum; Engine torque passes to automatic transmission after increasing square through torque-converters, and when motor was in idling mode, clamping strap was not braked brake drum; Do not have moment of torsion to pass to automatic transmission this moment; Thereby realize motor to the rotating speed of automatic transmission and the transmission of moment of torsion, and make and be connected to become nonrigidly between motor and the automatic transmission, made things convenient for the automatic transmission self shifter.
Mechanical type torque-converters of the present invention can be used for automatic transmission, and compares fluid torque converter, owing to do not have hydraulic losses, has improved transmission efficiency, and transmission efficiency can reach more than 80%; Because mainly be to accomplish the moment of torsion transmission by several bevel gears, compact structure has reduced radial dimension, helps realizing the lightweight and the miniaturization of torque-converters, and easy disassembling, and is easy to maintenance, can effectively reduce the production and the maintenance cost of torque-converters.
Description of drawings
In order to be illustrated more clearly in technological scheme of the present invention; Do simple the introduction in the face of the accompanying drawing that will use required for the present invention down; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is mechanical torque converter one an embodiment's of the present invention structural representation;
Fig. 2 is mechanical torque converter one an embodiment's of the present invention explosive view;
Fig. 3 is the explosive view of mechanical torque converter one embodiment's of the present invention break;
Fig. 4 is the mechanical torque converter one embodiment's of the present invention clamping strap and the explosive view of brake actuator;
Fig. 5 is the sectional view of mechanical torque converter one embodiment's of the present invention outer shroud brake drum;
Fig. 6 is the schematic representation that is applied to automatic transmission of mechanical torque converter of the present invention;
Fig. 7 be mechanical torque converter of the present invention increase principle of moment figure.
Embodiment
To combine accompanying drawing below, the technological scheme among the present invention is carried out clear, complete description, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment among the present invention, all other embodiments that those of ordinary skills are obtained under the prerequisite of not making creative work belong to the scope that the present invention protects.
Embodiment one
Mechanical torque converter; Its structure such as Fig. 1, shown in Figure 2; Comprise an input bevel gear 6, an output bevel gear 8, a break, a planetary wheel carrier 5, a plurality of (as 2,34,5 or 6) bevel planet gear 4 (bevel gear is that reference surface is the gear of conical surface, is umbrella gear again) and bevel planet gear axle 41;
Said a plurality of bevel planet gear 4, through bevel planet gear axle 41, the radially pivot that follows star wheel frame 5 is fixed in planetary wheel carrier 5 outer rims respectively; Preferable, said a plurality of bevel planet gear 4 even pivots are fixed in planetary wheel carrier 5 outer rims;
Said input bevel gear 6 is in a side and 4 engagements of said a plurality of bevel planet gear of said planetary wheel carrier 5;
Said output bevel gear 8 is in the opposite side and 4 engagements of said a plurality of bevel planet gear of said planetary wheel carrier 5;
Said input bevel gear 6 is identical with said output bevel gear 8 numbers of teeth;
Said break is used for limiting the rotation of planetary wheel carrier 5.
Embodiment two
Based on embodiment one mechanical torque converter, said break like Fig. 2, shown in Figure 3, comprises a brake drum 3, a clamping strap 2, a brake actuator 7;
Said planetary wheel carrier 5, its outer rim and said brake drum 3 be corresponding radially to be distributed with a plurality of round holes, and said planetary wheel carrier 5 is fixed in the said brake drum 3;
Said a plurality of bevel planet gear 4 is fixed between the corresponding round hole on said brake drum 3 and the planetary wheel carrier 5 through bevel planet gear axle 41 pivots respectively;
Said clamping strap 2 is arranged on said brake drum 3 outer rims;
Said brake actuator 7 links to each other with said clamping strap 2, is used to drive said clamping strap 2 and compresses or unclamp said brake drum 3 outer rims.
Embodiment three
Based on embodiment two mechanical torque converter, like Fig. 2, Fig. 3, shown in Figure 4,
Said brake actuator 7, two link arms 71,72 that the length that has is different;
Said clamping strap 2 comprises the first arc band 21, the second arc band 22, clamping strap stationary axle 23;
Said clamping strap stationary axle 23 is used for fixing on the automatic speed changing tank shell;
One end of the said first arc band 21, the second arc band 22 is fixed in together through said clamping strap stationary axle 23 pivots; The other end of the first arc band 21, the second arc band 22 is fixed together with two different link arm 71,72 pivots of the length of said brake actuator 7 respectively.
Embodiment four
Based on embodiment two mechanical torque converter, said brake drum 3, like Fig. 2, Fig. 3, Fig. 4, shown in Figure 5,
Comprise outer shroud brake drum 31, interior ring brake drum 32;
The internal diameter on said outer shroud brake drum 31 tops is less than the internal diameter of bottom, and is formed with a plurality of semi-circular recesses 311 vertically at the same abut lower place on top;
Mechanical torque converter of the present invention can be applied to automatic transmission.Fig. 6 is the example that mechanical torque converter of the present invention is applied to automatic transmission, and the motor output terminal is connected with mechanical torque converter of the present invention, and transmitting torque through after the bending moment, is given automatic transmission with transmission of power.
Mechanical torque converter of the present invention to increase principle of moment as shown in Figure 7, T
eBe engine output torque, T
oBe the output torque of this mechanical torque converter, T
bBe the braking moment of brake drum, the engaging force when F meshes for importing bevel gear and bevel planet gear, F
oEngaging force during for output bevel gear and bevel planet gear engagement, r is the radius of input bevel gear and input bevel gear.
Engaging force F when input bevel gear and bevel planet gear mesh can be by computes:
The braking moment T of brake drum
bCan be by computes:
T
b＝(F
o-F)r (2)
So, the output torque T of said mechanical torque converter
oFor:
Formula (3) explains, when clamping strap is braked brake drum, and the output bevel gear output torque braking moment sum that to be Engine torque produce with braking, thus can the braking moment size when regulating braking increase square.
Mechanical torque converter of the present invention, the input bevel gear is used for linking to each other with the motor output terminal, receives Engine torque; The output bevel gear is used for linking to each other with the input shaft of automatic transmission, and moment of torsion is exported to automatic transmission; A plurality of bevel planet gears and the engagement of input bevel gear, and while and the engagement of output bevel gear pass to the output bevel gear with Engine torque by the input bevel gear; Said a plurality of bevel planet gear is uniformly distributed with and is fixed on the said planetary wheel carrier, can rotation, also can revolve round the sun with planetary wheel carrier; Said brake drum connects the fixed one that is with said planetary wheel carrier; The automatic transmission housing is fixed on said clamping strap top; The bottom links to each other with brake actuator, and said brake actuator makes clamping strap and brake drum produce friction to a certain degree through the tension clamping strap; And then to brake drum generation friction torque, the rotation of restriction planetary wheel carrier; When brake drum was braked band and brakes fully, planetary wheel carrier is fixing not to rotate, because the input bevel gear is identical with the output number of teeth in bevel gears and hypoid gears, exporting the bevel gear output torque is Engine torque; When brake drum was partly braked, planetary wheel carrier was by the affix friction torque, and the moment of torsion of output bevel gear output is an Engine torque friction torque sum therewith, thereby can increase square through regulating this friction torque size; When clamping strap was not braked brake drum, planetary wheel carrier can freely rotate, and the output bevel gear is output torque not.Like this, when the automobile speed stabilizing was gone, clamping strap was braked brake drum fully; Engine torque is directly passed to automatic transmission, and when vehicle starting, clamping strap is partly braked brake drum; Engine torque passes to automatic transmission after increasing square through torque-converters, and when motor was in idling mode, clamping strap was not braked brake drum; Do not have moment of torsion to pass to automatic transmission this moment; Thereby realize motor to the rotating speed of automatic transmission and the transmission of moment of torsion, and make and be connected to become nonrigidly between motor and the automatic transmission, made things convenient for the automatic transmission self shifter.
Mechanical type torque-converters of the present invention can be used for automatic transmission, and compares fluid torque converter, owing to do not have hydraulic losses, has improved transmission efficiency, and transmission efficiency can reach more than 80%; Because mainly be to accomplish the moment of torsion transmission by several bevel gears, compact structure has reduced radial dimension, helps realizing the lightweight and the miniaturization of torque-converters, and easy disassembling, and is easy to maintenance, can effectively reduce the production and the maintenance cost of torque-converters.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (7)
1. a mechanical torque converter is characterized in that, comprises an input bevel gear, an output bevel gear, a break, a planetary wheel carrier, a plurality of bevel planet gear and bevel planet gear axle;
Said a plurality of bevel planet gear, through the bevel planet gear axle, the radially pivot that follows star wheel frame is fixed in the planetary wheel carrier outer rim respectively;
Said input bevel gear is in a side and said a plurality of bevel planet gear engagement of said planetary wheel carrier;
Said output bevel gear is in opposite side and said a plurality of bevel planet gear engagement of said planetary wheel carrier;
Said input bevel gear is identical with said output number of teeth in bevel gears and hypoid gears;
Said break is used for limiting the rotation of planetary wheel carrier.
2. mechanical torque converter according to claim 1 is characterized in that,
Said break comprises a brake drum, a clamping strap, a brake actuator;
Said brake drum is ring, and its inner rim radially is distributed with a plurality of round holes;
Said planetary wheel carrier, its outer rim is corresponding with said brake drum radially to be distributed with a plurality of round holes, and said planetary wheel carrier is fixed in the said brake drum;
Said a plurality of bevel planet gear is fixed between the corresponding round hole on said brake drum and the planetary wheel carrier through bevel planet gear axle pivot respectively;
Said clamping strap is arranged on said brake drum outer rim;
Said brake actuator links to each other with said clamping strap, is used to drive said clamping strap and compresses or unclamp said brake drum outer rim.
3. mechanical torque converter according to claim 2 is characterized in that,
The outer fringe surface of said brake drum scribbles friction material.
4. mechanical torque converter according to claim 2 is characterized in that,
Said brake actuator, two link arms that the length that has is different;
Said clamping strap comprises the first arc band, the second arc band, clamping strap stationary axle;
Said clamping strap stationary axle is used for fixing on the automatic speed changing tank shell;
One end of the said first arc band, the second arc band is fixed in together through clamping strap stationary axle pivot, and the other end of the first arc band, the second arc band is fixed together with two different link arm pivots of the length of said brake actuator respectively.
5. mechanical torque converter according to claim 2 is characterized in that,
Said brake drum comprises outer shroud brake drum, interior ring brake drum;
The internal diameter on said outer shroud brake drum top is less than the internal diameter of bottom, and is formed with a plurality of semi-circular recesses vertically at the same abut lower place on top;
Ring brake drum in said; Its internal diameter equals the internal diameter on said outer shroud brake drum top; Its external diameter is smaller or equal to the internal diameter of said outer shroud brake drum bottom, said in ring brake drum one side be formed with vertically with said outer shroud brake drum top on the corresponding a plurality of semi-circular recesses of a plurality of semi-circular recesses;
Encircle brake drum and the amalgamation of said outer shroud brake drum in said together, a plurality of semi-circular recesses of said interior ring brake drum one side constitute a plurality of round hole that the brake drum inner edge radially distributes jointly with a plurality of semi-circular recesses on the said outer shroud brake drum top.
6. according to each described mechanical torque converter of claim 1 to 5, it is characterized in that,
The number of bevel planet gear and bevel planet gear axle is 2,34,5 or 6.
7. according to each described mechanical torque converter of claim 1 to 5, it is characterized in that, said a plurality of bevel planet gears, respectively through the bevel planet gear axle, the radially even pivot that follows star wheel frame is fixed in the planetary wheel carrier outer rim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210187140.5A CN102734391B (en) | 2012-06-08 | 2012-06-08 | Mechanical torque converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210187140.5A CN102734391B (en) | 2012-06-08 | 2012-06-08 | Mechanical torque converter |
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| Publication Number | Publication Date |
|---|---|
| CN102734391A true CN102734391A (en) | 2012-10-17 |
| CN102734391B CN102734391B (en) | 2015-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210187140.5A Active CN102734391B (en) | 2012-06-08 | 2012-06-08 | Mechanical torque converter |
Country Status (1)
| Country | Link |
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| CN (1) | CN102734391B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103291848A (en) * | 2013-04-15 | 2013-09-11 | 武汉理工大学 | Bevel gear splitter |
| CN107830122A (en) * | 2017-10-23 | 2018-03-23 | 成峰消防设备（上海）有限公司 | A kind of planetary gear that any gear ratio can be achieved and its application |
| CN108488274A (en) * | 2018-04-24 | 2018-09-04 | 江苏中力齿轮有限公司 | A kind of electric vehicle planet carrier brake hub and its manufacturing method |
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| WO1991014113A1 (en) * | 1990-03-03 | 1991-09-19 | Arnold Derek Child | Mechanical torque converters |
| US6116024A (en) * | 1999-05-13 | 2000-09-12 | Tcp Performance Converters | Torque converter employing a mechanical diode |
| CN1373309A (en) * | 2001-02-28 | 2002-10-09 | 方祖彭 | Planetary static pressure torque converter and static pressure mechanical torque converter |
| CN102358159A (en) * | 2011-08-05 | 2012-02-22 | 上海中科深江电动车辆有限公司 | Hybrid drive system with hydraulic torque converter |
| CN102434634A (en) * | 2011-12-07 | 2012-05-02 | 吴守京 | Differential gear type planetary gear reducer |
| CN202719078U (en) * | 2012-06-08 | 2013-02-06 | 联合汽车电子有限公司 | Mechanical torque converter |
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2012
- 2012-06-08 CN CN201210187140.5A patent/CN102734391B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991014113A1 (en) * | 1990-03-03 | 1991-09-19 | Arnold Derek Child | Mechanical torque converters |
| US6116024A (en) * | 1999-05-13 | 2000-09-12 | Tcp Performance Converters | Torque converter employing a mechanical diode |
| CN1373309A (en) * | 2001-02-28 | 2002-10-09 | 方祖彭 | Planetary static pressure torque converter and static pressure mechanical torque converter |
| CN102358159A (en) * | 2011-08-05 | 2012-02-22 | 上海中科深江电动车辆有限公司 | Hybrid drive system with hydraulic torque converter |
| CN102434634A (en) * | 2011-12-07 | 2012-05-02 | 吴守京 | Differential gear type planetary gear reducer |
| CN202719078U (en) * | 2012-06-08 | 2013-02-06 | 联合汽车电子有限公司 | Mechanical torque converter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103291848A (en) * | 2013-04-15 | 2013-09-11 | 武汉理工大学 | Bevel gear splitter |
| CN103291848B (en) * | 2013-04-15 | 2016-01-06 | 武汉理工大学 | Bevel gear splitter |
| CN107830122A (en) * | 2017-10-23 | 2018-03-23 | 成峰消防设备（上海）有限公司 | A kind of planetary gear that any gear ratio can be achieved and its application |
| CN108488274A (en) * | 2018-04-24 | 2018-09-04 | 江苏中力齿轮有限公司 | A kind of electric vehicle planet carrier brake hub and its manufacturing method |
| CN108488274B (en) * | 2018-04-24 | 2024-05-28 | 青岛恒胜金属制品有限公司 | Electric automobile planet carrier brake hub and manufacturing method thereof |
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| CN102734391B (en) | 2015-08-19 |
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