CN211449535U - Integrated planetary mechanism two-gear transmission - Google Patents
Integrated planetary mechanism two-gear transmission Download PDFInfo
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- CN211449535U CN211449535U CN201922452793.1U CN201922452793U CN211449535U CN 211449535 U CN211449535 U CN 211449535U CN 201922452793 U CN201922452793 U CN 201922452793U CN 211449535 U CN211449535 U CN 211449535U
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Abstract
The utility model belongs to the technical field of a transmission, in particular to an integrated planetary mechanism two-gear transmission, which comprises a transmission shell, an input shaft and an output shaft; the input shaft is provided with a sun wheel and a high-grade cone hub, the output shaft is provided with a planet carrier, and the planet carrier is rotatably connected with a planet wheel; a low-gear cone hub is arranged in the transmission shell; the planet gear is sleeved with a gear ring, and the gear ring is positioned between the high-grade cone hub and the low-grade cone hub; a first synchronous locking ring is arranged between the high-grade cone hub and the planet wheel, and a second synchronous locking ring is arranged between the low-grade cone hub and the planet wheel; the first synchronous locking ring and the second synchronous locking ring are respectively positioned in two sides of the gear ring and can be meshed with the gear ring through spline teeth; and the first synchronous locking ring and the second synchronous locking ring are both provided with positioning parts, and two sides of the gear ring are both provided with driving mechanisms. This scheme unites two into one planetary mechanism and synchronizer assembly, shortens installation length, reduces part quantity for synchronizer both ends inertia is fairly just little, promotes the life-span of synchronizer.
Description
Technical Field
The utility model belongs to the technical field of the derailleur, concretely relates to two speed transmission of integrated form planetary mechanism.
Background
The electric automobile is a novel, energy-saving and environment-friendly vehicle, and particularly has huge development potential and wide application prospect in the current large environment with serious air pollution. The electric automobile replaces the engine of the traditional automobile with the electric motor, the electric motor can be started with load, and the use requirement of the automobile is met through reasonable configuration, which is greatly different from the engine. While it is not appropriate to use a multi-speed transmission in an electric vehicle, a two-speed transmission is generally used in an electric vehicle in order to meet requirements for climbing, high-speed running, and the like.
The existing two-gear transmission for the electric automobile is a planetary mechanism two-gear transmission, as shown in fig. 1, the two-gear transmission comprises an input shaft 10, an output shaft 11, a sun gear 12, a high-gear cone hub 15, a synchronizer assembly 40, a low-gear cone hub 23, a planet gear 21 and a planet carrier 24, the transmission is a conventional structure that a set of synchronizers are additionally arranged on a planet row, the structure is long in installation length, a large in number of parts and complex in assembly process, one end of each synchronizer needs to bear the rotational inertia of the whole planetary mechanism, the load is large, the requirement on the whole gear shifting performance is high, the two-gear transmission is not economical, and meanwhile the service life of each synchronizer is shortened.
SUMMERY OF THE UTILITY MODEL
The utility model provides an integrated form planetary mechanism keeps off derailleur two to solve two fender derailleur installation length of current planetary mechanism long, part is in large quantity, the problem that assembly process is complicated.
In order to achieve the above purpose, the utility model discloses a scheme does: the integrated planetary mechanism two-gear transmission comprises a transmission shell, an input shaft and an output shaft, wherein the input shaft and the output shaft are both rotationally connected to the transmission shell, and the input shaft and the output shaft are positioned on the same axial lead; the input shaft is provided with a sun gear and a high-grade cone hub which are positioned in the transmission shell, the output shaft is fixedly provided with a planet carrier which is positioned in the transmission shell, and the planet carrier is rotationally connected with a plurality of planet gears which are meshed with the sun gear; a low-gear cone hub is fixedly arranged in the transmission shell; the planet gear is sleeved with a gear ring meshed with the planet gear, the gear ring is positioned between the high-grade cone hub and the low-grade cone hub, and inner rings on two sides of the gear ring are provided with spline teeth; a first synchronous locking ring is arranged between the high-grade cone hub and the planet wheel, and the cone of the high-grade cone hub extends into a cone hole of the first synchronous locking ring; a second synchronous lock ring is arranged between the low-gear cone hub and the planet wheel, and the cone of the low-gear cone hub extends into a cone hole of the second synchronous lock ring; the first synchronous locking ring and the second synchronous locking ring are respectively positioned in two sides of the gear ring and can be meshed with the gear ring through spline teeth; the first synchronous locking ring and the second synchronous locking ring are both provided with positioning parts, and both sides of the gear ring are both provided with driving mechanisms which can contact with the positioning parts and push the positioning parts to move.
The working principle of the scheme is as follows:
in this scheme, the ring gear is equivalent to the clutch collar of a common synchronizer, and the planet wheel is equivalent to the spline hub of the common synchronizer. When the transmission works, the rotor of the motor drives the input shaft to rotate, the input shaft drives the sun gear to rotate, and the sun gear drives the transmission output shaft to rotate through the planet gear via the planet carrier. When the vehicle needs to run at low speed, the gear ring is moved, a synchronizer formed by the gear ring and the like is separated from the high-grade cone hub, and then the synchronizer is synchronously meshed with the low-grade cone hub. Because the low-gear cone hub is fixed in the shell of the speed changer, the gear ring is restricted by the low-gear cone hub to stop rotating, and the gear ring is in a fixed state at the moment. The power input by the motor drives the planet wheel to revolve around the sun wheel through the input shaft and the sun wheel, the revolving planet wheel drives the planet carrier to rotate, the planet carrier drives the output shaft to rotate to output power, and the vehicle forms a low-gear running state. When the vehicle needs to run at a high speed, the gear ring is moved, a synchronizer formed by the gear ring and the like is separated from the low-grade cone hub and then synchronously meshed with the high-grade cone hub. After the synchronizer is synchronously meshed with the high-grade cone hub, the gear ring and the high-grade cone hub have the same rotating speed, and the sun gear, the high-grade cone hub and the gear ring have the same rotating speed due to the fact that the high-grade cone hub is fixedly connected with the input shaft. The planet gear is positioned between the sun gear and the gear ring and is meshed with the sun gear and the gear ring at the same time, under the driving of the sun gear and the gear ring, the planet gear revolves around the sun gear at the same speed, the revolving planet gear drives the planet carrier to rotate, the planet carrier drives the output shaft to rotate to output power, the output speed of the output shaft is consistent with the speed of the input shaft, and the vehicle forms a high-speed gear running state.
The beneficial effect of this scheme lies in:
1. in this scheme, replace the clutch collar of synchronous ware with the ring gear of planetary mechanism, replace the spline hub of synchronous ware with the planet wheel, unite two into one planetary mechanism and synchronous ware assembly, effectively shorten installation length, when reducing part quantity for synchronous ware both ends inertia is fairly just little, can promote the life-span of synchronous ware.
2. The shifting fork shaft can be fixed in the gearbox shell, and the shifting fork moves on the shifting fork shaft during gear shifting.
Optionally, the driving mechanism comprises a steel ball and an elastic piece, grooves penetrating through the gear ring are formed in two sides of the gear ring respectively, and one end, close to the input shaft, of each groove is conical; the steel ball is placed in the groove, the elastic piece is installed in the groove, and one side of the steel ball extends out of the groove under the action of the elastic piece. When the gear ring moves, the steel ball moves along with the gear ring, the steel ball is contacted with the positioning part on the first synchronous locking ring or the second synchronous locking ring, and the steel ball exerts acting force on the positioning part to enable the first synchronous locking ring or the second synchronous locking ring to move.
Optionally, the elastic member comprises a spring plate and an elastic pin, and the elastic pin fixes the spring plate in the groove; one end of the steel ball is contacted with the spring piece. And an elastic pin is arranged and plays a supporting role on the spring.
Optionally, two sides of the gear ring are respectively provided with three driving mechanisms, and the three driving mechanisms are uniformly distributed along the circumferential direction of the gear ring. The three driving mechanisms are arranged, so that acting force can be uniformly applied to the positioning parts on the first synchronous locking ring and the second synchronous locking ring, and the first synchronous locking ring and the second synchronous locking ring can stably move.
Optionally, the positioning part is a protrusion, and the steel ball can contact with the side wall of the protrusion.
Optionally, a planet wheel shaft is fixedly arranged on the planet carrier, and the planet wheel is mounted on the planet wheel shaft through a bearing. Through the arrangement, relative rotation between the planet wheel and the planet wheel shaft can be prevented, and abrasion is reduced.
Optionally, the sun gear is matched with the input shaft through a spline, and the input shaft is provided with a retainer ring for axially limiting the sun gear; the high-grade cone hub is connected to the input shaft through spline interference.
Optionally, the low range cone hub is secured to the transmission housing by a cylindrical pin.
Optionally, the transmission housing comprises a front shell and a rear shell, and the front shell and the rear shell are fixedly connected through bolts to form the transmission housing; the lower end of the transmission shell is provided with an accommodating chamber, and the upper end of the transmission shell is provided with an actuating mechanism window.
Optionally, a shifting fork shaft is fixedly arranged in the transmission housing, and a shifting fork is sleeved on the shifting fork shaft in an empty mode.
Drawings
FIG. 1 is a cross-sectional view of a prior art two speed transmission;
fig. 2 is a cross-sectional view of an integrated planetary mechanism two-speed transmission in an embodiment of the present invention;
fig. 3 is an enlarged view of a portion a in fig. 2.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the synchronizer assembly comprises an input shaft 10, an output shaft 11, a sun gear 12, a rear shell 13, a front shell 14, a high-grade cone hub 15, a first synchronous locking ring 16, a protrusion 17, a second synchronous locking ring 18, a gear ring 20, a planet gear 21, a low-grade cone hub 23, a planet carrier 24, a groove 30, a spring piece 31, a steel ball 32 and a synchronizer assembly 40.
This embodiment is substantially as shown in fig. 2: the integrated planetary mechanism two-gear transmission comprises a transmission shell, an input shaft 10, a gear ring 20, an output shaft 11, a sun gear 12, a planet gear 21, a planet gear shaft, a high-gear cone hub 15, a low-gear cone hub 23, a shifting fork shaft, a first synchronous locking ring 16 and a second synchronous locking ring 18. The transmission shell comprises a front shell 14 and a rear shell 13, the front shell 14 and the rear shell 13 are fixedly connected through bolts to form the transmission shell, an accommodating chamber is arranged at the lower end of the transmission shell, and an actuating mechanism window is arranged at the upper end of the transmission shell. The ring gear 20, the sun gear 12, the planet gears 21, the planet gear shafts, the fork shafts, the first synchronizing lock ring 16, the second synchronizing lock ring 18, the high-range cone hub 15 and the low-range cone hub 23 are all located in the accommodating chamber. The low-gear cone hub 23 is fixed on the rear shell 13, and specifically, the low-gear cone hub 23 is fixedly installed on the rear shell 13 through 4 cylindrical pins, and bears torque through 4 cylindrical pins.
The first shaft hole is formed in the front shell 14, the first bearing located in the first shaft hole is installed on the front shell 14, the input shaft 10 is rotatably connected to the front shell 14 through the first bearing, and the right end of the input shaft 10 extends into the accommodating chamber. A second shaft hole is formed in the rear shell 13, a second bearing located in the second shaft hole is mounted on the rear shell 13, the output shaft 11 is rotatably connected to the rear shell 13 through the second bearing, and the left end of the output shaft 11 extends into the accommodating chamber. The input shaft 10 and the output shaft 11 are located on the same axial lead, and the input shaft 10 and the output shaft 11 are not directly connected.
Fork shaft supporting holes are formed in the front shell 14 and the rear shell 13, two ends of each fork shaft are located in the fork shaft supporting holes in the front shell 14 and the rear shell 13 respectively, semicircular grooves are formed in the fork shafts and the fork shaft supporting holes, and elastic cylindrical pins are installed in the semicircular grooves and used for preventing the fork shafts from rotating. A shifting fork is sleeved above the shifting fork shaft, and the shifting fork is moved in the shifting process.
The sun gear 12 is fixed on the input shaft 10, the sun gear 12 can be matched with the input shaft 10 through a spline, and can also be integrally formed with the input shaft 10, in this embodiment, the sun gear 12 is matched with the input shaft 10 through a spline, and the input shaft 10 is provided with a retaining ring to limit the sun gear 12 in the axial direction. The high-grade cone hub 15 is fixed on the input shaft 10 and is positioned on the left side of the sun gear 12, and specifically, the high-grade cone hub 15 is connected on the input shaft 10 through spline interference. The carrier 24 is circumferentially fixed to the output shaft 11, and the circumferential fixation may be fixed by a single key or spline connection, or may be fixed by interference fit or welding connection. The planet carrier 24 is provided with a planet support plate, the planet carrier 24 and the planet support plate are axially fixed through 4 hexagon socket head cap bolts, 4 uniformly distributed planet wheel shafts are circumferentially fixed on the planet support plate, the planet support plate is provided with a through hole, one end of each planet wheel shaft is installed in the through hole, and the planet wheel shafts are installed in the through holes in an interference fit mode in the embodiment. The planet wheel 21 is mounted on a planet wheel shaft through a bearing, the planet wheel 21 is positioned between the high-gear cone hub 15 and the low-gear cone hub 23, and the planet wheel 21 is meshed with the sun wheel 12.
The ring gear 20 is located between the front shell 14 and the rear shell 13, the ring gear 20 being rotatably connected within a housing of the rotational speed unit, in particular a support carrier being fixed within the housing of the rotational speed unit, the ring gear 20 being rotatably connected to the support carrier. The gear ring 20 is sleeved outside the planet wheel 21, and teeth on the inner ring of the gear ring 20 are meshed with the planet wheel 21. The outer ring of the gear ring 20 is provided with a clamping groove, a shifting fork in the transmission shell is clamped on the clamping groove, and the shifting fork drives the gear ring 20 to move through the clamping groove. Referring to fig. 3, a set of grooves 30 vertically arranged and penetrating through the gear ring 20 is respectively formed on the left side and the right side of the gear ring 20, in this embodiment, the number of the set of grooves 30 is 3 (the grooves 30 are spaced at an interval of 120 ° on the circumference), one end of each groove 30 close to the input shaft 10 is conical, and a steel ball 32 is placed in each groove 30. A spring plate 31 is fixed to the ring gear 20 in the recess 30, in this embodiment the spring plate 31 is fixed to the ring gear 20 in the recess 30 by a spring pin. The spring piece 31 is contacted with the steel ball 32, and one side of the steel ball 32 extends out of the groove 30 under the action of the spring piece 31.
The first synchronous lock ring 16 is positioned between the high-grade cone hub 15 and the planet wheel 21, the cone of the high-grade cone hub 15 extends into the conical hole of the first synchronous lock ring 16, the first synchronous lock ring 16 is also positioned in the left side of the gear ring 20, and the first synchronous lock ring 16 can be clamped with the gear ring 20 through spline teeth. The second synchronous lock ring 18 is positioned between the low-gear conical hub 23 and the planet wheel 21, the cone of the low-gear conical hub 23 extends into the conical hole of the second synchronous lock ring 18, the second synchronous lock ring 18 is also positioned in the right side of the gear ring 20, and the first synchronous lock ring 16 and the second synchronous lock ring 18 can be meshed with the gear ring 20 through spline teeth.
The first synchronous locking ring 16 and the second synchronous locking ring 18 are both fixedly provided with a protrusion 17, the protrusion 17 can be contacted with one side of the steel ball 32 extending out of the groove 30, and the contact surface of the protrusion 17 and the steel ball 32 is an inclined surface. When the gear ring 20 moves towards the left side, the steel ball 32 on the left side moves together with the gear ring 20, the steel ball 32 is in contact with the protrusion 17 on the first synchronous locking ring 16, the steel ball 32 applies acting force to the protrusion 17, the first synchronous locking ring 16 moves towards one side of the high-grade cone hub 15, and finally the steel ball 32 moves to the upper surface of the protrusion 17 and radially compresses the protrusion 17 and the high-grade cone hub 15 under the action of the spring piece 31. When the gear ring 20 moves to the right, the steel ball 32 on the right moves together with the gear ring 20, the steel ball 32 contacts with the protrusion 17 on the second synchronous locking ring 18, and the steel ball 32 applies acting force to the protrusion 17, so that the second synchronous locking ring 18 moves to the low-gear conical hub 23 side.
In this embodiment, the ring gear 20 (corresponding to a coupling sleeve of a common synchronizer), the steel ball 32 on the ring gear 20, the spring piece 31, the planet wheel 21 (corresponding to a spline hub of the common synchronizer), the first synchronizing ring 16, and the second synchronizing ring 18 actually constitute one synchronizer, and can achieve the same operation and effect as the synchronizer.
When the integrated planetary mechanism two-gear transmission works, the rotor of the motor drives the input shaft 10 to rotate, the input shaft 10 drives the sun gear 12 to rotate, and the sun gear 12 drives the transmission output shaft 11 to rotate through the planet gear 21 and the planet carrier 24. When the vehicle needs to run at a low speed, the gear ring 20 of the synchronizer is shifted to the right, so that the synchronizer is separated from the high-gear cone hub 15 and then synchronously meshed with the low-gear cone hub 23. Since the low range cone hub 23 is fixed in the transmission housing, the ring gear 20 is restrained by the low range cone hub 23 to stop rotating, and the ring gear 20 is in a fixed state. The power input by the motor passes through the input shaft 10 and drives the planetary gear 21 to revolve around the sun gear 12 through the sun gear 12, the revolving planetary gear 21 drives the planetary carrier 24 to rotate, the planetary carrier 24 drives the output shaft 11 to rotate to output power, and the vehicle forms a low-gear running state. When the vehicle needs to run at a high speed, the gear ring 20 of the synchronizer is shifted, so that the synchronizer is separated from the low-gear cone hub 23 and then synchronously meshed with the high-gear cone hub 15. After the synchronizer is synchronously meshed with the high-grade cone hub 15, the gear ring 20 and the high-grade cone hub 15 have the same rotating speed, and the high-grade cone hub 15 is fixedly connected with the sun gear 12, so that the sun gear 12, the high-grade cone hub 15 and the gear ring 20 have the same rotating speed. The planet wheel 21 is positioned between the sun wheel 12 and the ring gear 20 and is meshed with the sun wheel 12 and the ring gear 20 at the same time, under the driving of the sun wheel 12 and the ring gear 20, the planet wheel 21 revolves around the sun wheel 12 at the same speed, the revolving planet wheel 21 drives the planet carrier 24 to rotate, the planet carrier 24 drives the output shaft 11 to rotate to output power, the output speed of the output shaft 11 is consistent with the speed of the input shaft 10, and the vehicle forms a high-speed gear running state.
The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It should be pointed out that to those skilled in the art, without departing from the structure of the present invention, a plurality of modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the utility of the present invention.
Claims (10)
1. The integrated planetary mechanism two-gear transmission comprises a transmission shell, an input shaft and an output shaft, wherein the input shaft and the output shaft are both rotationally connected to the transmission shell, and the input shaft and the output shaft are positioned on the same axial lead; the input shaft is provided with a sun gear and a high-grade cone hub which are positioned in the transmission shell, the output shaft is fixedly provided with a planet carrier which is positioned in the transmission shell, and the planet carrier is rotationally connected with a plurality of planet gears which are meshed with the sun gear; the method is characterized in that: a low-gear cone hub is fixedly arranged in the transmission shell; the planet gear is sleeved with a gear ring meshed with the planet gear, the gear ring is positioned between the high-grade cone hub and the low-grade cone hub, and inner rings on two sides of the gear ring are provided with spline teeth; a first synchronous locking ring is arranged between the high-grade cone hub and the planet wheel, and the cone of the high-grade cone hub extends into a cone hole of the first synchronous locking ring; a second synchronous lock ring is arranged between the low-gear cone hub and the planet wheel, and the cone of the low-gear cone hub extends into a cone hole of the second synchronous lock ring; the first synchronous locking ring and the second synchronous locking ring are respectively positioned in two sides of the gear ring and can be meshed with the gear ring through spline teeth; the first synchronous locking ring and the second synchronous locking ring are both provided with positioning parts, and both sides of the gear ring are both provided with driving mechanisms which can contact with the positioning parts and push the positioning parts to move.
2. The integrated planetary mechanism two speed transmission as in claim 1, wherein: the driving mechanism comprises a steel ball and an elastic piece, grooves penetrating through the gear ring are formed in two sides of the gear ring respectively, and one end, close to the input shaft, of each groove is conical; the steel ball is placed in the groove, the elastic piece is installed in the groove, and one side of the steel ball extends out of the groove under the action of the elastic piece.
3. The integrated planetary mechanism two speed transmission as in claim 2, wherein: the elastic piece comprises a spring piece and an elastic pin, and the spring piece is fixed in the groove by the elastic pin; one end of the steel ball is contacted with the spring piece.
4. The integrated planetary mechanism two speed transmission as in claim 3, wherein: three driving mechanisms are respectively arranged on two sides of the gear ring and are uniformly distributed along the circumferential direction of the gear ring.
5. The integrated planetary mechanism two speed transmission as in claim 4, wherein: the positioning part is a bulge, and the steel ball can be in contact with the side wall of the bulge.
6. The integrated planetary mechanism two speed transmission as in claim 1, wherein: the planet carrier is fixedly provided with a planet wheel shaft, and the planet wheel is arranged on the planet wheel shaft through a bearing.
7. The integrated planetary mechanism two speed transmission as in claim 1, wherein: the sun wheel is matched with the input shaft through a spline, and the input shaft is provided with a check ring for forming axial limit on the sun wheel; the high-grade cone hub is connected to the input shaft through spline interference.
8. The integrated planetary mechanism two speed transmission as in claim 1, wherein: the low-gear cone hub is fixed on the transmission shell through a cylindrical pin.
9. The integrated planetary mechanism two speed transmission as in claim 1, wherein: the transmission shell comprises a front shell and a rear shell, and the front shell and the rear shell are fixedly connected through bolts to form the transmission shell; the lower end of the transmission shell is provided with an accommodating chamber, and the upper end of the transmission shell is provided with an actuating mechanism window.
10. The integrated planetary mechanism two speed transmission as in claim 1, wherein: a shifting fork shaft is fixedly arranged in the transmission shell, and a shifting fork is sleeved on the shifting fork shaft in an empty mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922452793.1U CN211449535U (en) | 2019-12-30 | 2019-12-30 | Integrated planetary mechanism two-gear transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922452793.1U CN211449535U (en) | 2019-12-30 | 2019-12-30 | Integrated planetary mechanism two-gear transmission |
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| Publication Number | Publication Date |
|---|---|
| CN211449535U true CN211449535U (en) | 2020-09-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922452793.1U Active CN211449535U (en) | 2019-12-30 | 2019-12-30 | Integrated planetary mechanism two-gear transmission |
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| CN (1) | CN211449535U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110985619A (en) * | 2019-12-30 | 2020-04-10 | 綦江齿轮传动有限公司 | Integrated planetary mechanism two-gear transmission |
| CN113864428A (en) * | 2021-09-18 | 2021-12-31 | 东风商用车有限公司 | Low-gear cone hub structure, rear shell device and transmission |
-
2019
- 2019-12-30 CN CN201922452793.1U patent/CN211449535U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110985619A (en) * | 2019-12-30 | 2020-04-10 | 綦江齿轮传动有限公司 | Integrated planetary mechanism two-gear transmission |
| CN113864428A (en) * | 2021-09-18 | 2021-12-31 | 东风商用车有限公司 | Low-gear cone hub structure, rear shell device and transmission |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220402 Address after: 401420 building 103, No. 7, Xichi Avenue, Gunan street, Qijiang District, Chongqing Patentee after: Chongqing Qichi gear Research Institute Co.,Ltd. Address before: 401420 NO.666, Jiefang Road, Qiaohe street, Qinjiang District, Chongqing Patentee before: QIJIANG GEAR TRANSMISSION Co.,Ltd. |
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