CN104633061A - Gear case body for tramcar - Google Patents
Gear case body for tramcar Download PDFInfo
- Publication number
- CN104633061A CN104633061A CN201410776985.7A CN201410776985A CN104633061A CN 104633061 A CN104633061 A CN 104633061A CN 201410776985 A CN201410776985 A CN 201410776985A CN 104633061 A CN104633061 A CN 104633061A
- Authority
- CN
- China
- Prior art keywords
- oil
- hole
- case body
- upper box
- described upper
- 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.)
- Granted
Links
- 239000003921 oil Substances 0.000 description 40
- 239000012530 fluid Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000010724 circulating oil Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 230000005570 vertical transmission Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H2700/00—Transmission housings and mounting of transmission components therein; Cooling; Lubrication; Flexible suspensions, e.g. floating frames
- F16H2700/02—Transmissions, specially for working vehicles
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Details Of Gearings (AREA)
Abstract
The invention discloses a gear case body for a tramcar. The gear case body comprises an upper case body, a lower case body, a small bearing base and big bearing bases. The upper case body is provided with an upper wall inclined face and further provided with an oil inlet window, an oil collection cavity, an oil inlet hole and a second oil return hole. The inclined angle of the upper wall inclined face and the horizontal plane ranges from 15 degrees to 30 degrees. The upper wall inclined face stretches to the oil inlet window. The oil inlet window is communicated with the oil collection cavity. The bottom of the oil collection cavity is communicated with the oil inlet hole. The oil inlet hole is communicated with a small bearing base hole. The small bearing base hole is communicated with the second oil return hole. The second oil return hole is communicated with an inner cavity of the gear case body. The op of the upper case body is provided with an opening. The outer end face of the small bearing base stretches out of the side face of the upper case body. The upper case body is further provided with a small oil window, a second oil discharge hole and an oil discharge channel. A lifting hole center for upper end lifting of the upper case body, a lifting hole center for lower end lifting and centers of big bearing base holes are distributed in a triangular shape. The gear case body is compact in structure, stable and reliable to work and easy to maintain.
Description
Technical field
The present invention relates to a kind of gear-box of tram car, especially about 100% low-floor tram car gear case body.
Background technique
In recent years, low-floor tram car is a kind of boom town rail traffic vehicles between light rail and subway, and have unique advantage, wherein, gear-box is the important transmission part of low-floor tram car, and gear case body is then the critical component of gear-box.The existing patent of current tram car gear drive is CN 203717849 U: a kind of First-stage spiral bevel gear transmission device, the casing of this gear drive has following deficiency: (1) erecting by overhang exceeds the longer segment distance of casing, and structure is compact not; (2) casing only relies on an erecting by overhang to be fastenedly connected, operationally stability and reliability deficiency; (3) when pinion shaft component lubrication effect is bad or run appearance exception, the situation of little bearing hole inside can not be observed, pinion shaft assembly can only be disassembled inspection, not easily care and maintenance.
Summary of the invention
The object of the present invention is to provide the tram car gear case body that a kind of compact structure, working stability are reliable, be easy to care and maintenance.
The technological scheme realizing above-mentioned purpose is: a kind of tram car gear case body, comprise: upper box, lower box, small bearing bracket and large bearing support, wherein, described upper box and lower box are fastenedly connected and become casing, described large bearing support is split type structure, on, lower box respectively accounts for half, large bearing support has large bearing saddle bore, described small bearing bracket is positioned on upper box, small bearing bracket centerline hole and the large bearing saddle bore center line of described small bearing bracket are perpendicular, described small bearing bracket inside is provided with gear tank deck rank, described upper box has upper wall inclined-plane, described upper box is also provided with oil-feed window, collection chamber, oil inlet hole and the second spill port, angle theta between described upper wall inclined-plane and horizontal plane
1it is 15 ° ~ 30 °, described upper wall inclined-plane extends to oil-feed window, oil-feed window connected set oil pocket, oil inlet hole is communicated with bottom collection chamber, oil inlet hole is communicated with small bearing bracket hole, small bearing bracket hole is communicated with the second spill port, second spill port leads to cabinets cavity, the top of described upper box has opening, opening and collection chamber through, the exterior edge face of described small bearing bracket is stretched out outside the side of upper box, described upper box also has little oily window, second drain oil and oil duct of draining the oil, described oil duct two ends of draining the oil communicate with collection chamber and the second drain oil respectively, described little oily window communicates with small bearing bracket hole, described large bearing support has two, and lay respectively at the both sides of casing, lower box bottom described large bearing support all has the first spill port, first spill port leads to cabinets cavity, between described upper box and lower box, junction plane is in being in tilted layout, inclination angle theta
2it is 30 ° ~ 45 °, the side of described casing has taper pin-hole, the outer end place of the small bearing bracket on described upper box is provided with upper end hanging and lower end hanging, and the center three of the lifting hole(eyelet) center that the lifting hole(eyelet) center of described upper end hanging, lower end are hung and large bearing saddle bore is angular distribution.
Oil inlet hole on described upper box is positioned at the positively biased below of oil-feed window.
The top of described upper box is provided with Ventilated cap mounting hole, and the opening of described Ventilated cap mounting hole sinks in the surface of upper box.
Described lower box also comprises large oily window and the first drain oil, and the first drain oil communicates with bottom cabinets cavity.
The side of described upper box is provided with nameplate boss.
3 the first spill ports are all arranged at the bottom of each large bearing support.
Adopt the railroad car gear case body after technique scheme, have the following advantages and effect:
1) due to small bearing bracket centerline hole and large bearing saddle bore central axis, the vertical transmission of motion and moment of torsion can be realized, under large bearing saddle bore center line, bearing saddle bore center line one segment distance less than normal, reduces the center of gravity of casing, is particularly suited for the driving gear box body of low-floor tram car;
2) owing to adopting upper end hanging to hang with lower end, and the exterior edge face of small bearing bracket is stretched out outside the side of upper box, eliminates the input end horn mouth profile of prior art, therefore, has the feature of compact structure;
3), after upper end hanging and lower end are hung and be in place, casing has enough stability and reliability.Exterior edge face due to small bearing bracket is stretched out outside the side of upper box, also be convenient to the installation and removal of pinion shaft assembly, in addition, the taper pin-hole that upper and lower casing is used for locating opens the side at casing, instead of prior art pin-and-hole is opened on mold joint, be more convenient for the installation and removal of casing.
4) upper box is provided with collection chamber and little oily window, can be observed the runnability of pinion shaft assembly and driven gear by collection chamber, when input end occurs abnormal, can not dismantle pinion shaft assembly and can find problem place.The situation of change of the inner fluid in small bearing bracket hole can be observed by little oily window, when input end lubrication effect is not good, directly by the opening at collection chamber top, fluid can be injected into oil inlet hole, the fluid injecting oil inlet hole flow in small bearing bracket hole, pinion shaft assembly is made to store enough lubricating oils, therefore, the setting of collection chamber and little oily window, is beneficial to maintenance and the maintenance of gear-box.In addition, this collection chamber can collect the fluid not entered oil inlet hole by drainage, and flows back to casing by the second spill port.
5) because oil duct of draining the oil communicates with collection chamber, by the second drain oil, thoroughly can put the rotten lubricant oil of clean upper box collection chamber inside, be beneficial to the cleaning in upper box.
Accompanying drawing explanation
The present invention is described in further detail for the embodiment provided below in conjunction with accompanying drawing.
Fig. 1 is the plan view of tram car gear case body of the present invention;
Fig. 2 is the plan view of Fig. 1;
Fig. 3 is the B-B sectional view of Fig. 2;
Fig. 4 is the C-C sectional view of Fig. 2.
Embodiment
As shown in figures 1-4, tram car gear case body of the present invention, comprise: upper box 1, lower box 2, small bearing bracket 3 and large bearing support 4, wherein, described upper box 1 is fastenedly connected with lower box 2 becomes casing, described large bearing support 4 is split type structure, on, lower box 1, 2 respectively account for half, large bearing support 4 has large bearing saddle bore 4-1, described small bearing bracket 3 is positioned on upper box 1, small bearing bracket hole 3-1 center line and the large bearing saddle bore 4-1 center line of described small bearing bracket 3 are perpendicular, and the distance d offseting small bearing bracket hole 3-1 center line under large bearing saddle bore 4-1 center line is 10 mm ~ 50mm, described small bearing bracket 3-1 inside is provided with gear tank deck rank 3-2, described upper box 1 has upper wall inclined-plane 1-1, described upper box 1 is also provided with oil-feed window 17, collection chamber 15, oil inlet hole 16 and the second spill port 18, angle theta between described upper wall inclined-plane 1-1 and horizontal plane
1it is 15 ° ~ 30 °, described upper wall inclined-plane 1-1 extends to oil-feed window 17, oil-feed window 17 connected set oil pocket 15, oil inlet hole 16 is communicated with bottom collection chamber 15, oil inlet hole 16 is communicated with small bearing bracket hole 3-1, small bearing bracket hole 3-1 is communicated with the second spill port 18, second spill port 18 leads to cabinets cavity 20, the top of described upper box 1 has opening 15-1, opening 15-1 and collection chamber 15 through, the exterior edge face of described small bearing bracket 3 is stretched out outside the side of upper box 1, described upper box 1 also has little oily window 13, second drain oil 11 and oil duct 19 of draining the oil, described oil duct 19 two ends of draining the oil communicate with collection chamber 15 and the second drain oil 11 respectively, described little oily window 13 communicates with small bearing bracket hole 3-1, described large bearing support 4 has two, and lay respectively at the both sides of casing, lower box 2 bottom described large bearing support 4 all has the first spill port 9, first spill port 9 leads to cabinets cavity 20, between described upper box 1 and lower box 2, junction plane is in being in tilted layout, inclination angle theta
2it is 30 ° ~ 45 °, the side of described casing has taper pin-hole 6, the outer end place of the small bearing bracket 3 on described upper box 1 is provided with upper end hanging 14 and lower end hanging 12, and the lifting hole(eyelet) center of 12 is hung at the lifting hole(eyelet) center of described upper end hanging 14, lower end and the center three of large bearing saddle bore 4-1 is angular distribution.
As shown in Figure 3, the oil inlet hole 16 on described upper box 1 is positioned at the positively biased below of oil-feed window 17.
As shown in Figure 1, 2, the top of described upper box 1 is provided with Ventilated cap mounting hole 5, and the opening of described Ventilated cap mounting hole 5 sinks in the surface of upper box 1.Like this, after Ventilated cap mounting hole 5 installs Ventilated cap, there is compacter space.
As shown in Figure 1, in order to observe the oil level of lower box 2 inside, and put the fluid of clean lower box 2, described lower box 2 also comprises large oily window 7 and the first drain oil 8, first drain oil 8 communicates with bottom cabinets cavity 20.
As shown in Figure 1, for the ease of casing at obvious station location marker, the side of described upper box 1 is provided with nameplate boss 10.
As shown in Figure 3,4,3 the first spill ports 9 are all arranged at the bottom of each large bearing support 4.
As shown in Figure 1,3, the angle theta between described upper wall inclined-plane 1-1 and horizontal plane
1it is 15 ° ~ 30 °, like this, play good drainage oil-collecting effect, fluid can from the 1-1 drainage of upper wall inclined-plane through oil-feed window 17, and fall into oil inlet hole 16, and then it is inner to flow into small bearing bracket hole 3-1, the fluid of 3-1 inside, small bearing bracket hole flows back to box house by the second spill port 18, forms the circulating oil path of drive end.
The opening 15-1 at described collection chamber 15 top is convenient to the behaviour in service of observing lower box 2 inner body (as: driven gear); After fluid flows into 3-1 inside, small bearing bracket hole, owing to keeping off the oil-blocking action of tank deck rank 3-2, the fluid converged in the 3-1 of small bearing bracket hole flows back to cabinets cavity 20 from the second spill port 18.
Described oil duct 19 of draining the oil communicates with collection chamber 15, and oil duct 19 of draining the oil is communicated with the second drain oil 18 again, the fluid of collection chamber 15 inside can be put totally, facilitate the fluid in collection chamber 15 to be back to casing.
Described little oily window 13 is connected with 3-1 inside, small bearing bracket hole, is convenient to the fluid situation of change of observing upper box 1 inside.
The Ventilated cap mounting hole 5 on described upper box 1 top also can be used as the pouring orifice of casing.
Claims (6)
1. a tram car gear case body, comprise: upper box (1), lower box (2), small bearing bracket (3) and large bearing support (4), wherein, described upper box (1) and lower box (2) are fastenedly connected and become casing, described large bearing support (4) is split type structure, on, lower box (1, 2) respectively half is accounted for, large bearing support (4) has large bearing saddle bore (4-1), described small bearing bracket (3) is positioned on upper box (1), small bearing bracket hole (3-1) center line and large bearing saddle bore (4-1) center line of described small bearing bracket (3) are perpendicular, described small bearing bracket (3-1) inside is provided with gear tank deck rank (3-2), described upper box (1) has upper wall inclined-plane (1-1), it is characterized in that:
A, described upper box (1) are also provided with oil-feed window (17), collection chamber (15), oil inlet hole (16) and the second spill port (18), the angle theta between described upper wall inclined-plane (1-1) and horizontal plane
1it is 15 ° ~ 30 °, described upper wall inclined-plane (1-1) extends to oil-feed window (17), oil-feed window (17) connected set oil pocket (15), collection chamber (15) bottom is communicated with oil inlet hole (16), oil inlet hole (16) is communicated with small bearing bracket hole (3-1), small bearing bracket hole (3-1) is communicated with the second spill port (18), and the second spill port (18) is towards cabinets cavity (20)
The top of b, described upper box (1) has opening (15-1), and opening (15-1) is through with collection chamber (15),
The exterior edge face of c, described small bearing bracket (3) is stretched out outside the side of upper box (1),
D, described upper box (1) also have little oily window (13), the second drain oil (11) and oil duct of draining the oil (19), described oil duct of draining the oil (19) two ends communicate with collection chamber (15) and the second drain oil (11) respectively, described little oily window (13) communicates with small bearing bracket hole (3-1)
E, described large bearing support (4) have two, and lay respectively at the both sides of casing, the lower box (2) of described large bearing support (4) bottom all has the first spill port (9), and the first spill port (9) is towards cabinets cavity (20)
F, between described upper box (1) and lower box (2) junction plane in being in tilted layout, inclination angle theta
2be 30 ° ~ 45 °,
The side of g, described casing has taper pin-hole (6),
The outer end place of the small bearing bracket (3) on h, described upper box (1) is provided with upper end hanging (14) and lower end hanging (12), and the lifting hole(eyelet) center of (12) is hung at the lifting hole(eyelet) center of described upper end hanging (14), lower end and the center three of large bearing saddle bore (4-1) is angular distribution.
2. tram car gear case body according to claim 1, is characterized in that: the oil inlet hole (16) on described upper box (1) is positioned at the positively biased below of oil-feed window (17).
3. tram car gear case body according to claim 1, it is characterized in that: the top of described upper box (1) is provided with Ventilated cap mounting hole (5), the opening of described Ventilated cap mounting hole (5) sinks in the surface of upper box (1).
4. tram car gear case body according to claim 1, it is characterized in that: described lower box (2) also comprises large oily window (7) and the first drain oil (8), the first drain oil (8) communicates with cabinets cavity (20) bottom.
5. railroad car gear case body according to claim 1, is characterized in that: the side of described upper box (1) is provided with nameplate boss (10).
6. railroad car gear case body according to claim 1, is characterized in that: 3 the first spill ports (9) are all arranged at the bottom of each large bearing support (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410776985.7A CN104633061B (en) | 2014-12-17 | 2014-12-17 | Gear case body for tramcar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410776985.7A CN104633061B (en) | 2014-12-17 | 2014-12-17 | Gear case body for tramcar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104633061A true CN104633061A (en) | 2015-05-20 |
| CN104633061B CN104633061B (en) | 2017-02-22 |
Family
ID=53212144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410776985.7A Active CN104633061B (en) | 2014-12-17 | 2014-12-17 | Gear case body for tramcar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104633061B (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5828051A (en) * | 1981-08-10 | 1983-02-18 | Toshiba Corp | Reduction worm gear |
| JPH03239852A (en) * | 1990-02-15 | 1991-10-25 | Hino Motors Ltd | Carrier case of full drive vehicle differential gear |
| JP2003185001A (en) * | 2001-12-19 | 2003-07-03 | Aisin Ai Co Ltd | Lubricating device for transmission |
| JP2006064056A (en) * | 2004-08-26 | 2006-03-09 | Mazda Motor Corp | Bearing lubricating structure for differential device |
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| CN102494115A (en) * | 2011-11-29 | 2012-06-13 | 南车株洲电力机车有限公司 | Bearing lubricating structure of driving gear shaft of gear box for urban rail traffic vehicle |
| CN102951162A (en) * | 2011-08-24 | 2013-03-06 | 南车戚墅堰机车车辆工艺研究所有限公司 | Hanging device of gear transmission system |
| CN103026102A (en) * | 2010-08-13 | 2013-04-03 | 艾里逊变速箱公司 | Housing with a direct flow path for hardware lubrication |
| CN103195912A (en) * | 2013-04-12 | 2013-07-10 | 南京高速齿轮制造有限公司 | Gear box of rail transit vehicle |
| WO2013149773A1 (en) * | 2012-04-02 | 2013-10-10 | Zf Friedrichshafen Ag | Gearbox arrangement for a rail vehicle |
| CN203272741U (en) * | 2013-04-12 | 2013-11-06 | 南京高速齿轮制造有限公司 | Gear box for subway vehicles |
| CN203670721U (en) * | 2013-11-29 | 2014-06-25 | 北京南口轨道交通机械有限责任公司 | Gear case body |
| CN104048022A (en) * | 2013-03-12 | 2014-09-17 | 南车戚墅堰机车车辆工艺研究所有限公司 | Box body of subway gear box |
| CN204387271U (en) * | 2014-12-17 | 2015-06-10 | 常州市瑞泰工程机械有限公司 | A kind of tram car gear case body |
-
2014
- 2014-12-17 CN CN201410776985.7A patent/CN104633061B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5828051A (en) * | 1981-08-10 | 1983-02-18 | Toshiba Corp | Reduction worm gear |
| JPH03239852A (en) * | 1990-02-15 | 1991-10-25 | Hino Motors Ltd | Carrier case of full drive vehicle differential gear |
| JP2003185001A (en) * | 2001-12-19 | 2003-07-03 | Aisin Ai Co Ltd | Lubricating device for transmission |
| JP2006064056A (en) * | 2004-08-26 | 2006-03-09 | Mazda Motor Corp | Bearing lubricating structure for differential device |
| CN201100322Y (en) * | 2007-09-27 | 2008-08-13 | 刘景山 | Watch hole for bearing box |
| CN201763934U (en) * | 2010-03-31 | 2011-03-16 | 南京高速齿轮制造有限公司 | Gear box used for track transportation vehicle |
| CN103026102A (en) * | 2010-08-13 | 2013-04-03 | 艾里逊变速箱公司 | Housing with a direct flow path for hardware lubrication |
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| CN104048022A (en) * | 2013-03-12 | 2014-09-17 | 南车戚墅堰机车车辆工艺研究所有限公司 | Box body of subway gear box |
| CN103195912A (en) * | 2013-04-12 | 2013-07-10 | 南京高速齿轮制造有限公司 | Gear box of rail transit vehicle |
| CN203272741U (en) * | 2013-04-12 | 2013-11-06 | 南京高速齿轮制造有限公司 | Gear box for subway vehicles |
| CN203670721U (en) * | 2013-11-29 | 2014-06-25 | 北京南口轨道交通机械有限责任公司 | Gear case body |
| CN204387271U (en) * | 2014-12-17 | 2015-06-10 | 常州市瑞泰工程机械有限公司 | A kind of tram car gear case body |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104633061B (en) | 2017-02-22 |
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Effective date of registration: 20170721 Address after: 213011 No. 99 Wuyi Road, Jiangsu, Changzhou, China Co-patentee after: CRRC QISHUYAN INSTITUTE Co.,Ltd. Patentee after: CHANGZHOU RUITAI ENGINEERING MACHINERY Co.,Ltd. Address before: 213011 Wuyi Road, Qishuyan District, Jiangsu, China, No. 99, No. Patentee before: CHANGZHOU RUITAI ENGINEERING MACHINERY Co.,Ltd. |
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Address after: 213011 No.99, Wuyi Road, Changzhou City, Jiangsu Province Patentee after: Changzhou CRRC Ruitai Equipment Technology Co.,Ltd. Patentee after: CRRC QISHUYAN INSTITUTE Co.,Ltd. Address before: 213011 No.99, Wuyi Road, Changzhou City, Jiangsu Province Patentee before: CHANGZHOU RUITAI ENGINEERING MACHINERY Co.,Ltd. Patentee before: CRRC QISHUYAN INSTITUTE Co.,Ltd. |
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Address after: 213011 No.99, Wuyi Road, Changzhou City, Jiangsu Province Patentee after: Changzhou CRRC Ruitai Equipment Technology Co.,Ltd. Country or region after: China Patentee after: CRRC Qishuyan Locomotive and Rolling Stock Technology Research Institute Co.,Ltd. Address before: 213011 No.99, Wuyi Road, Changzhou City, Jiangsu Province Patentee before: Changzhou CRRC Ruitai Equipment Technology Co.,Ltd. Country or region before: China Patentee before: CRRC QISHUYAN INSTITUTE Co.,Ltd. |
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