CA2243742A1 - Power mining shovel brake apparatus and method of retrofitting - Google Patents
Power mining shovel brake apparatus and method of retrofitting Download PDFInfo
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- CA2243742A1 CA2243742A1 CA 2243742 CA2243742A CA2243742A1 CA 2243742 A1 CA2243742 A1 CA 2243742A1 CA 2243742 CA2243742 CA 2243742 CA 2243742 A CA2243742 A CA 2243742A CA 2243742 A1 CA2243742 A1 CA 2243742A1
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- brake
- transmission
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- relative
- carbody
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- 238000005065 mining Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims description 15
- 238000009420 retrofitting Methods 0.000 title claims description 7
- 230000005540 biological transmission Effects 0.000 claims abstract description 90
- 230000000712 assembly Effects 0.000 claims description 8
- 238000000429 assembly Methods 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 3
- 239000002775 capsule Substances 0.000 description 8
- 238000010276 construction Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- 239000011521 glass Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 241000282326 Felis catus Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Abstract
A power mining shovel including a carbody, an upper frame rotatably mounted on the carbody, a dipper handle mounted on the upper frame for pivotal movement relative thereto, a dipper mounted on the dipper handle, a crawler track assembly supporting the carbody for movement over the ground, a motor which is mounted on the carbody and which has an output shaft, a drive train drivingly connecting the motor output shaft to the crawler track assembly, the drive train including a drive shaft drivingly connected to the crawler track assembly, and a propel transmission which is drivingly connected to the drive shaft and which is driven by the motor output shaft, and a disc brake apparatus operably connected to the drive train for selectively preventing rotation of the drive shaft.
Description
POWER MINING SHOVEL BRAKE APPARATUS
AND METHOD OF RETROFITTING
BACKGROUND OF THE INVENTION
The invention relates to power mining shovels, such as those used for surface mining.
A typical power mining shovel includes a revolvable upper frame supported on a mobile carbody.
The manner in which the carbody is supported is described below. A fixed boom extends upwardly and outwardly from the frame, and a dipper handle is mounted on the boom for movement for pivotal and translational (non-pivotal) movement relative to the boom. A dipper is fixed to the end of the dipper handle. The outer end of the boom has thereon a sheave, and a hoist cable or rope extends over the sheave and is fastened to the dipper.
The carbody is supported by ground-engaging means, such as crawler track assemblies. A typical crawler track assembly includes a series of shoes that are pivotally pinned together and that have shoe drive lugs which are engaged and pushed by a rotating drive tumbler. The drive tumbler is mounted on a rotating tumbler or drive shaft and has a sprocket-like shape including tumbler lugs that extend radially outward and engage the shoe drive lugs as the tumbler rotates, thereby driving the shoes and moving the crawler track around its endless path.
Referring to Fig. 1, which partially illustrates a prior art mining shovel, each crawler track assembly (not shown) is driven by a motor 10 via a drive train.
The drive train includes a propel transmission 14 including a transmission housing 18 fixed to the carbody (not shown), and three sets of reduction gears 20. The drive train also includes a transmission output shaft 22 supported by the transmission housing 18 and drivingly connected to the tumbler shaft (not shown), and a transmission input shaft 26 supported by the transmission housing 18 and drivingly connected to the propel transmission 14. The transmission input shaft 26 is supported relative to the housing 18 by a bearing 30, which is held by a bearing capsule 34 and a bearing retainer 38 fixed to the housing 18 by screws 42. An input sheave 46 is drivingly connected to the transmission input shaft 26. The sheave 46 is splined to the shaft 26 and is held on the shaft 26 by an end plate 50 and screws 54. An output sheave 58 (shown only in Fig. 3) is driven by the motor output shaft 62, and a belt 66 drivingly connects the output sheave to the input sheave 46. A brake apparatus 70 selectively brakes the crawler track assembly. The brake apparatus includes a V-drum 74 fixed to the transmission output shaft 22, a brake member 78 engageable with the V-drum, and a brake-applying device or linkage system (not shown) for selectively causing the brake member 78 to engage the V-drum 74 and prevent rotation of the tumbler shaft. The linkage system is spring-set so that the brake member engages the V-drum and applies a braking force unless air pressure from a pneumatic system (not shown) is applied to release the braking force. Such a braking arrangement is well known in the art.
Due to the complexity of the linkage, and wear at many pivot points, continuous manual adjustment of the linkage is required to maintain proper function of the brake apparatus. This results in a significant amount of lost production time.
SUMMARY OF THE INV~N'l'ION
The invention provides an improved braking arrangement that overcomes the problems of the prior art. The invention also provides a simple method of retrofitting an existing power mining shovel with the improved braking arrangement.
More particularly, the invention provides a power mining shovel comprising a carbody, an upper frame rotatably mounted on the carbody, a dipper handle mounted on the upper frame for pivotal movement relative thereto, and a dipper mounted on the dipper handle. Ground-engaging means support the carbody for movement over the ground. A motor mounted on the carbody has an output shaft, and a drive train drivingly connects the motor output shaft to the ground-engaging means. The drive train includes a drive shaft drivingly connected to the ground-engaging means, and a propel transmission which is drivingly connected to the drive shaft and which is driven by the motor output shaft. A disc brake apparatus is operably connected to the drive train for selectively preventing rotation of the drive shaft.
In one embodiment of the invention, the brake apparatus is mounted directly on the propel transmission. Preferably, the propel transmission includes a transmission housing fixed to the carbody, the drive train also includes a transmission output shaft supported by the transmission housing and drivingly connected to the drive shaft, and a transmission input shaft drivingly connected to the propel transmission, and the disc brake apparatus is operably connected to the transmission input shaft.
This location of the disc brake is preferred because the torque at the transmission input shaft is much lower than at the transmission output shaft, where the prior art brake is located.
In one embodiment of the invention, the drive train also includes an input sheave drivingly connected to the transmission input shaft, an output sheave driven by the motor output shaft, and a belt drivingly connecting the output sheave to the input sheave, and the brake apparatus extends inside the input sheave.
In one embodiment of the invention, the brake apparatus includes a wear indicator.
The invention also provides a method of retrofitting a prior art power mining shovel as described above, the prior art shovel having a brake apparatus including a V-drum operably connected to the drive train, a brake member engageable with the V-drum, and a brake-applying device for selectively causing the brake member to engage the V-drum and prevent rotation of the drive shaft, the method comprising the steps of disabling the brake-applying device, and providing a disc brake apparatus operably connected to the drive train for selectively preventing rotation of the drive shaft.
The disc brake apparatus of the invention is easily installed on an existing power mining shovel, with m; n i m~ 1 modifications of existing structures. The disc brake apparatus is substantially maintenance-free, providing a significant reduction in the amount of lost production time.
Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims and drawings.
DESCRIPTION OF THE DRAWINGS
Fig. 1 is a partial plan view, partially in cross section, of a prior art power mining shovel with a conventional braking arrangement.
Fig. 2 is a side elevational view of a power mining shovel embodying the invention and including an improved braking arrangement.
Fig. 3 is a plan view, partially in cross section, of the lower portion of the shovel shown in Fig. 2.
Fig. 4 is an enlarged portion of Fig. 3 showing the improved braking arrangement in cross section.
Fig. 5 is a further enlarged portion of the braking arrangement shown in cross section.
Fig. 6 is a view taken along line 6--6 in Fig. 5.
Fig. 7 is a schematic view of the pneumatic system of the power mining shovel shown in Fig. 2.
Before one embodiment of the invention is explained in detail, it is to be understood that the invention is not limited in its application to the details of the construction and the arrangements of components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A power mining shovel 100 that has been retrofitted in accordance with the invention is illustrated in Figs. 2-7 of the drawings. Except as described below, the shovel 100 is identical to the prior art shovel, and common elements have been given the same reference numerals. The shovel 100 comprises a carbody 104 (Fig. 3), and an upper frame 108 (Fig.2) mounted on the carbody 104 for rotation relative thereto about a generally vertical axis. In the illustrated construction, the upper frame 108 rotates about a ring gear 112 (Fig. 3) on the carbody 104. The shovel 100 also comprises (see Fig. 2) a boom 116 mounted on the upper frame 108, and a dipper handle 120 mounted on the boom 116 for pivotal movement relative thereto about a generally horizontal axis, and for translational movement relative thereto. A dipper 124 is mounted on the end of the dipper handle 120. A
hoist mechanism including a hoist rope 128 pivots the dipper handle 120 relative to the boom 116, and a crowd mechanism 132 moves the dipper handle 120 translationally relative to the boom 116.
The shovel 100 also comprises ground-engaging means supporting the carbody 104 for movement over the ground. In the illustrated construction, the ground-engaging means include (see Figs. 2 and 3) crawler track assemblies 136a and 136b. In alternative embodiments of the invention, the ground-engaging means could includes other means such as wheels. The crawler track assemblies 136a and 136b are mirror images of each other, and common elements have been given the same reference numerals. Each of the crawler track assemblies 136 includes (see Fig. 2) a crawler frame 140 fixed to the carbody 104, a crawler shoe assembly 144 movable relative to the crawler frame 140, an idler tumbler 148 supporting the crawler shoe assembly 144 relative to the crawler frame 140, and a drive tumbler 152 for moving the crawler shoe assembly relative to the crawler frame. Motors lOa and lOb (Fig. 3) are mounted on the carbody 104 and have respective output shafts 62a and 62b. The motors lOa and lOb are drivingly connected to the crawler track assemblies 136a and 136b, respectively, by drive trains 156a and 156b. The drive trains are substantially identical, and only the drive train 156a will be described in detail. Common elements have been given the same reference numerals.
The drive train 156a includes a tumbler shaft 160 drivingly connected to the drive tumbler 152. The drive train 156a also includes a propel transmission 14 including a transmission housing 18 fixed to the carbody 104, and three sets of reduction gears 20. A
transmission output shaft 22 is supported by the transmission housing 18 and is drivingly connected to the tumbler shaft 160 via a pinion 164 on the output shaft 22 and a gear 168 on the tumbler shaft 160. In the illustrated construction, as shown in Fig. 3, the transmission output shaft 22 still has thereon the V-drum 74 of the prior art braking arrangement. It is not necessary to remove the V-drum 74 when retrofitting the shovel 100. Also, removal of the brake member 78 and brake linkage is optional. These can simply be left in place in a loosened condition.
The prior art shovel is retrofitted by disconnecting the pneumatic system from the brakes and removing the transmission input shafts 26, the bearings 30, the bearing capsules 34, the bearing retainers 38, the screws 42, the input sheaves 46, the end plates S0, and the screws 54 of the prior art shovel. This is a fairly simple process because these components are easily accessible. The output sheaves 58 and the belts 66 of the prior art shovel are not removed, although the belts 66 are disconnected from the sheaves 46.
The prior art transmission input shaft 26 is replaced with (see Fig. 4) a transmission input shaft 172 drivingly connected to the propel transmission 14.
The shaft 172 has thereon a pinion 176 (Fig. 3) that is part of the first set of reduction gears 20. The shaft 172 has external splines and a longitudinal axis 180 (Fig. 4). The prior art bearing 30, bearing capsule 34 and bearing retainer 38 are replaced with a bearing 181, bearing capsule 182 and bearing retainer 184 that are fixed to the transmission housing 18 in a manner described below. A spacer 188 surrounds the shaft 172 inside the bearing retainer 184, and a seal 192 extends between the spacer 188 and the bearing retainer 184.
The prior art input sheave 46 is replaced with an input sheave 196 mounted on the input shaft 172. The sheave 196 has a hub 200 with internal splines engaging the splines on the shaft 172 so that the sheave 196 is drivingly connected to the shaft 172. Inner and outer sheave rings 204 and 208, respectively, surround the shaft 172 inside the hub 200. The prior art end plate 50 and screws 54 are replaced with an end plate 212 and screws 216 that secure the sheave 196 on the shaft 172.
The outer sheave ring 208 spaces the sheave hub 200 from the end plate 212. The belt 66 drivingly connects the output sheave 58 to the input sheave 196.
To replace the prior art brakes, the shovel 100 is provided with disc brake apparatus 220a and 220b (Fig.
3) operably connected to the drive trains 156a and 156b, respectively. The brake apparatus are substantially identical, and only the apparatus 220a will be described in detail. Common elements have been given the same reference numerals.
The disc brake apparatus 220a extends inside the input sheave 196 ~this conserves space) and includes (see Fig. 4) a brake hub 224 mounted on the transmission input shaft 172 for rotation therewith.
As mentioned above, the brake 220a is preferably connected to the input shaft 172, rather than elsewhere in the drive train, because the torque is lowest at the shaft 172. It should be understood, however, that in alternative embodiments of the invention the brake can be located elsewhere in the drive train. The brake hub 224 has internal splines engaging the splines on the shaft 172. The hub 224 also has external splines, the reason for which is explained below. The spacer 188 spaces the hub 224 from the bearing 181, and the inner sheave ring 204 spaces the brake hub 224 from the sheave hub 200.
A brake housing 228 surrounds the brake hub 224 and is fixed to the transmission housing 18 as described below. In the illustrated construction, the brake housing 228 is made of three parts, an inner part 232, a middle part 236, and an outer part 240. The inner part 232 is fixed to the transmission housing 18 by screws 244 that also fix the bearing retainer 184 and the bearing capsule 182 to the housing 18 and that replace the prior art screws 42. The middle part 236 is fixed to the inner part 232 by screws 248. The outer part 240 is fixed to the middle part 236 by bolts 252 and nuts 256. The middle and outer parts 236 and 240 define therebetween an annular space 260 through which the bolts 252 extend. The middle part 236 has thereon an annular brake pad 264 facing outwardly (downward in Fig. 4) and toward the space 260. The inner and middle parts 232 and 236 of the brake housing 228 define an annular cylinder cavity 268 centered on the shaft axis 180. Diametrically spaced upper and lower air ports 272 in the inner part 232 communicate with the cavity 268.
The brake apparatus 220a also includes a ring-shaped piston 276 slidably housed in the cylinder cavity 268. The piston 276 has opposite pressure and rod sides (upper and lower sides in Fig. 4). Inner and outer floating rings 280 and 284, respectively, are located in the space 260 and have therein bores through which the bolts 252 extend so that the rings 280 and 284 are fixed against rotation relative to the brake housing 228 and are movable relative to the brake housing 228 in the direction of the axis 180 (top-to-bottom in Fig. 4). The inner ring 280 has thereon an annular brake pad 288 facing inwardly and toward the brake pad 264, and an annular brake pad 292 facing outwardly and toward the outer ring 284. The outer ring 284 has thereon an annular brake pad 296 facing inwardly and toward the brake pad 292.
The brake apparatus 220a also includes inner and outer brake discs 300 and 304, respectively. The discs 300 and 304 have internal splines engaging the splines on the brake hub 224 so that the discs are movable relative to the brake housing 228 in the direction of the axis 180 (top-to-bottom in Fig. 4) and are fixed against rotation relative to the brake hub 224. The inner disc 300 extends between the brake pad 264 on the housing 228 and the brake pad 288 on the inner ring 280, and the outer disc 304 extends between the brake pad 292 on the ring 280 and the brake pad 296 on the ring 284. In other words, the floating rings 280 and 284 and the brake discs 300 and 304 are in an alternating arrangement. A plurality of springs 308 extend between the outer part 240 and the outer ring 284 and bias the floating rings 280 and 284 so as to squeeze the discs 300 and 304 between the brake pads to prevent rotation of the discs 300 and 304. This prevents rotation of the brake hub 224 and the transmission input shaft 172 relative to the brake housing 228, thereby braking the entire drive train 156a. The brake apparatus 220a is thus spring-set, i.e., the springs 308 set the brake in the absence of a stronger opposing force that releases the brake.
Such an opposing force is selectively provided by a plurality of piston rods 312 (only one is shown in Fig. 4) extending between the rod side of the ring piston 276 and the outer floating ring 284 such that the application of pressure to the pressure side of the ring piston 276 (the top side in Fig. 4) moves the ring piston 276, the piston rods 312 and the outer floating ring 284 against the force of the springs 308 so that the discs 300 and 304, the brake hub 224 and the transmission input shaft 172 are free to rotate relative to the brake housing 228. The piston rods 312 extend through bores in the inner ring 280 and into blind bores in the outer ring 284. The inner ring 280 is free to slide along the piston rods 312. The prior art pneumatic system is connected to the air ports 272 and thus to the cavity 268 for selectively applying pressure to the pressure side of the ring piston 276, thereby releasing the disc brake apparatus. The pneumatic system includes (see Fig. 7) a source 316 of compressed air (shown schematically in Fig. 7), which is accessible at the rear of the carbody 104. Upper and lower air conduits 320 and 324 comml]n;cate with the air source 316 via a quick relief valve 328. The upper conduit 320 communicates with the upper air port 272 in the brake housing 228, and the lower conduit 324 com--ml]n;cates with the lower air port 272 in the brake housing 228. The prior art control (not shown) is used to control air flow to the brake.
The brake apparatus 220a also includes (see Figs.
5-7) a wear indicator 332 that allows an operator to determine when brake components need to be replaced.
The wear indicator 332 includes (see Fig. 5) an indicating mem.~ber 336 fixed to the piston 276 for movement therewith. The indicating member 336 is visible through a sight glass 340 and an opening 344 in the brake housing 228. The sight glass 340 has thereon (see Fig. 6) scale lines 348 such that the operator can gauge the distance the piston 276 moves when the brake is applied. Movement beyond a predetermined distance indicates that the brake is excessively worn. The wear indicator 332 is preferably located at the rear of the brake housing 228, as shown in Fig. 7, for easy access.
The disc brake apparatus 220a is installed as follows. After the pneumatic system is disconnected from the prior art brake and the prior art transmission input shaft 26, bearing 30, bearing capsule 34, bearing retainer 38, screws 42, input sheave 46, end plate 50 and screws 54 are removed, the assembly of the new transmission input shaft 172, bearing 181, bearing capsule 182, bearing retainer 184, spacer 188 and seal 192 is positioned relative to the transmission housing 18. Then the inner part 232 of brake housing 228, the bearing retainer 184 and the bearing capsule 182 are fixed to the transmission housing 18 by the screws 244.
Next, the assembly of the brake hub 224, the discs 300 and 304, the floating rings 280 and 284, and the middle and outer parts 236 and 240 of the brake housing 228 is placed over the input shaft 172 and secured to the inner part 232 of the housing 228 by the screws 248.
The air conduits 320 and 324 are connected to the air ports 272, and the new input sheave 196 is secured to the input shaft 172 by the end plate 212 and screws 216. The belt 66 is then connected to the input sheave 196.
Various features of the invention are set forth in the following claims.
AND METHOD OF RETROFITTING
BACKGROUND OF THE INVENTION
The invention relates to power mining shovels, such as those used for surface mining.
A typical power mining shovel includes a revolvable upper frame supported on a mobile carbody.
The manner in which the carbody is supported is described below. A fixed boom extends upwardly and outwardly from the frame, and a dipper handle is mounted on the boom for movement for pivotal and translational (non-pivotal) movement relative to the boom. A dipper is fixed to the end of the dipper handle. The outer end of the boom has thereon a sheave, and a hoist cable or rope extends over the sheave and is fastened to the dipper.
The carbody is supported by ground-engaging means, such as crawler track assemblies. A typical crawler track assembly includes a series of shoes that are pivotally pinned together and that have shoe drive lugs which are engaged and pushed by a rotating drive tumbler. The drive tumbler is mounted on a rotating tumbler or drive shaft and has a sprocket-like shape including tumbler lugs that extend radially outward and engage the shoe drive lugs as the tumbler rotates, thereby driving the shoes and moving the crawler track around its endless path.
Referring to Fig. 1, which partially illustrates a prior art mining shovel, each crawler track assembly (not shown) is driven by a motor 10 via a drive train.
The drive train includes a propel transmission 14 including a transmission housing 18 fixed to the carbody (not shown), and three sets of reduction gears 20. The drive train also includes a transmission output shaft 22 supported by the transmission housing 18 and drivingly connected to the tumbler shaft (not shown), and a transmission input shaft 26 supported by the transmission housing 18 and drivingly connected to the propel transmission 14. The transmission input shaft 26 is supported relative to the housing 18 by a bearing 30, which is held by a bearing capsule 34 and a bearing retainer 38 fixed to the housing 18 by screws 42. An input sheave 46 is drivingly connected to the transmission input shaft 26. The sheave 46 is splined to the shaft 26 and is held on the shaft 26 by an end plate 50 and screws 54. An output sheave 58 (shown only in Fig. 3) is driven by the motor output shaft 62, and a belt 66 drivingly connects the output sheave to the input sheave 46. A brake apparatus 70 selectively brakes the crawler track assembly. The brake apparatus includes a V-drum 74 fixed to the transmission output shaft 22, a brake member 78 engageable with the V-drum, and a brake-applying device or linkage system (not shown) for selectively causing the brake member 78 to engage the V-drum 74 and prevent rotation of the tumbler shaft. The linkage system is spring-set so that the brake member engages the V-drum and applies a braking force unless air pressure from a pneumatic system (not shown) is applied to release the braking force. Such a braking arrangement is well known in the art.
Due to the complexity of the linkage, and wear at many pivot points, continuous manual adjustment of the linkage is required to maintain proper function of the brake apparatus. This results in a significant amount of lost production time.
SUMMARY OF THE INV~N'l'ION
The invention provides an improved braking arrangement that overcomes the problems of the prior art. The invention also provides a simple method of retrofitting an existing power mining shovel with the improved braking arrangement.
More particularly, the invention provides a power mining shovel comprising a carbody, an upper frame rotatably mounted on the carbody, a dipper handle mounted on the upper frame for pivotal movement relative thereto, and a dipper mounted on the dipper handle. Ground-engaging means support the carbody for movement over the ground. A motor mounted on the carbody has an output shaft, and a drive train drivingly connects the motor output shaft to the ground-engaging means. The drive train includes a drive shaft drivingly connected to the ground-engaging means, and a propel transmission which is drivingly connected to the drive shaft and which is driven by the motor output shaft. A disc brake apparatus is operably connected to the drive train for selectively preventing rotation of the drive shaft.
In one embodiment of the invention, the brake apparatus is mounted directly on the propel transmission. Preferably, the propel transmission includes a transmission housing fixed to the carbody, the drive train also includes a transmission output shaft supported by the transmission housing and drivingly connected to the drive shaft, and a transmission input shaft drivingly connected to the propel transmission, and the disc brake apparatus is operably connected to the transmission input shaft.
This location of the disc brake is preferred because the torque at the transmission input shaft is much lower than at the transmission output shaft, where the prior art brake is located.
In one embodiment of the invention, the drive train also includes an input sheave drivingly connected to the transmission input shaft, an output sheave driven by the motor output shaft, and a belt drivingly connecting the output sheave to the input sheave, and the brake apparatus extends inside the input sheave.
In one embodiment of the invention, the brake apparatus includes a wear indicator.
The invention also provides a method of retrofitting a prior art power mining shovel as described above, the prior art shovel having a brake apparatus including a V-drum operably connected to the drive train, a brake member engageable with the V-drum, and a brake-applying device for selectively causing the brake member to engage the V-drum and prevent rotation of the drive shaft, the method comprising the steps of disabling the brake-applying device, and providing a disc brake apparatus operably connected to the drive train for selectively preventing rotation of the drive shaft.
The disc brake apparatus of the invention is easily installed on an existing power mining shovel, with m; n i m~ 1 modifications of existing structures. The disc brake apparatus is substantially maintenance-free, providing a significant reduction in the amount of lost production time.
Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims and drawings.
DESCRIPTION OF THE DRAWINGS
Fig. 1 is a partial plan view, partially in cross section, of a prior art power mining shovel with a conventional braking arrangement.
Fig. 2 is a side elevational view of a power mining shovel embodying the invention and including an improved braking arrangement.
Fig. 3 is a plan view, partially in cross section, of the lower portion of the shovel shown in Fig. 2.
Fig. 4 is an enlarged portion of Fig. 3 showing the improved braking arrangement in cross section.
Fig. 5 is a further enlarged portion of the braking arrangement shown in cross section.
Fig. 6 is a view taken along line 6--6 in Fig. 5.
Fig. 7 is a schematic view of the pneumatic system of the power mining shovel shown in Fig. 2.
Before one embodiment of the invention is explained in detail, it is to be understood that the invention is not limited in its application to the details of the construction and the arrangements of components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A power mining shovel 100 that has been retrofitted in accordance with the invention is illustrated in Figs. 2-7 of the drawings. Except as described below, the shovel 100 is identical to the prior art shovel, and common elements have been given the same reference numerals. The shovel 100 comprises a carbody 104 (Fig. 3), and an upper frame 108 (Fig.2) mounted on the carbody 104 for rotation relative thereto about a generally vertical axis. In the illustrated construction, the upper frame 108 rotates about a ring gear 112 (Fig. 3) on the carbody 104. The shovel 100 also comprises (see Fig. 2) a boom 116 mounted on the upper frame 108, and a dipper handle 120 mounted on the boom 116 for pivotal movement relative thereto about a generally horizontal axis, and for translational movement relative thereto. A dipper 124 is mounted on the end of the dipper handle 120. A
hoist mechanism including a hoist rope 128 pivots the dipper handle 120 relative to the boom 116, and a crowd mechanism 132 moves the dipper handle 120 translationally relative to the boom 116.
The shovel 100 also comprises ground-engaging means supporting the carbody 104 for movement over the ground. In the illustrated construction, the ground-engaging means include (see Figs. 2 and 3) crawler track assemblies 136a and 136b. In alternative embodiments of the invention, the ground-engaging means could includes other means such as wheels. The crawler track assemblies 136a and 136b are mirror images of each other, and common elements have been given the same reference numerals. Each of the crawler track assemblies 136 includes (see Fig. 2) a crawler frame 140 fixed to the carbody 104, a crawler shoe assembly 144 movable relative to the crawler frame 140, an idler tumbler 148 supporting the crawler shoe assembly 144 relative to the crawler frame 140, and a drive tumbler 152 for moving the crawler shoe assembly relative to the crawler frame. Motors lOa and lOb (Fig. 3) are mounted on the carbody 104 and have respective output shafts 62a and 62b. The motors lOa and lOb are drivingly connected to the crawler track assemblies 136a and 136b, respectively, by drive trains 156a and 156b. The drive trains are substantially identical, and only the drive train 156a will be described in detail. Common elements have been given the same reference numerals.
The drive train 156a includes a tumbler shaft 160 drivingly connected to the drive tumbler 152. The drive train 156a also includes a propel transmission 14 including a transmission housing 18 fixed to the carbody 104, and three sets of reduction gears 20. A
transmission output shaft 22 is supported by the transmission housing 18 and is drivingly connected to the tumbler shaft 160 via a pinion 164 on the output shaft 22 and a gear 168 on the tumbler shaft 160. In the illustrated construction, as shown in Fig. 3, the transmission output shaft 22 still has thereon the V-drum 74 of the prior art braking arrangement. It is not necessary to remove the V-drum 74 when retrofitting the shovel 100. Also, removal of the brake member 78 and brake linkage is optional. These can simply be left in place in a loosened condition.
The prior art shovel is retrofitted by disconnecting the pneumatic system from the brakes and removing the transmission input shafts 26, the bearings 30, the bearing capsules 34, the bearing retainers 38, the screws 42, the input sheaves 46, the end plates S0, and the screws 54 of the prior art shovel. This is a fairly simple process because these components are easily accessible. The output sheaves 58 and the belts 66 of the prior art shovel are not removed, although the belts 66 are disconnected from the sheaves 46.
The prior art transmission input shaft 26 is replaced with (see Fig. 4) a transmission input shaft 172 drivingly connected to the propel transmission 14.
The shaft 172 has thereon a pinion 176 (Fig. 3) that is part of the first set of reduction gears 20. The shaft 172 has external splines and a longitudinal axis 180 (Fig. 4). The prior art bearing 30, bearing capsule 34 and bearing retainer 38 are replaced with a bearing 181, bearing capsule 182 and bearing retainer 184 that are fixed to the transmission housing 18 in a manner described below. A spacer 188 surrounds the shaft 172 inside the bearing retainer 184, and a seal 192 extends between the spacer 188 and the bearing retainer 184.
The prior art input sheave 46 is replaced with an input sheave 196 mounted on the input shaft 172. The sheave 196 has a hub 200 with internal splines engaging the splines on the shaft 172 so that the sheave 196 is drivingly connected to the shaft 172. Inner and outer sheave rings 204 and 208, respectively, surround the shaft 172 inside the hub 200. The prior art end plate 50 and screws 54 are replaced with an end plate 212 and screws 216 that secure the sheave 196 on the shaft 172.
The outer sheave ring 208 spaces the sheave hub 200 from the end plate 212. The belt 66 drivingly connects the output sheave 58 to the input sheave 196.
To replace the prior art brakes, the shovel 100 is provided with disc brake apparatus 220a and 220b (Fig.
3) operably connected to the drive trains 156a and 156b, respectively. The brake apparatus are substantially identical, and only the apparatus 220a will be described in detail. Common elements have been given the same reference numerals.
The disc brake apparatus 220a extends inside the input sheave 196 ~this conserves space) and includes (see Fig. 4) a brake hub 224 mounted on the transmission input shaft 172 for rotation therewith.
As mentioned above, the brake 220a is preferably connected to the input shaft 172, rather than elsewhere in the drive train, because the torque is lowest at the shaft 172. It should be understood, however, that in alternative embodiments of the invention the brake can be located elsewhere in the drive train. The brake hub 224 has internal splines engaging the splines on the shaft 172. The hub 224 also has external splines, the reason for which is explained below. The spacer 188 spaces the hub 224 from the bearing 181, and the inner sheave ring 204 spaces the brake hub 224 from the sheave hub 200.
A brake housing 228 surrounds the brake hub 224 and is fixed to the transmission housing 18 as described below. In the illustrated construction, the brake housing 228 is made of three parts, an inner part 232, a middle part 236, and an outer part 240. The inner part 232 is fixed to the transmission housing 18 by screws 244 that also fix the bearing retainer 184 and the bearing capsule 182 to the housing 18 and that replace the prior art screws 42. The middle part 236 is fixed to the inner part 232 by screws 248. The outer part 240 is fixed to the middle part 236 by bolts 252 and nuts 256. The middle and outer parts 236 and 240 define therebetween an annular space 260 through which the bolts 252 extend. The middle part 236 has thereon an annular brake pad 264 facing outwardly (downward in Fig. 4) and toward the space 260. The inner and middle parts 232 and 236 of the brake housing 228 define an annular cylinder cavity 268 centered on the shaft axis 180. Diametrically spaced upper and lower air ports 272 in the inner part 232 communicate with the cavity 268.
The brake apparatus 220a also includes a ring-shaped piston 276 slidably housed in the cylinder cavity 268. The piston 276 has opposite pressure and rod sides (upper and lower sides in Fig. 4). Inner and outer floating rings 280 and 284, respectively, are located in the space 260 and have therein bores through which the bolts 252 extend so that the rings 280 and 284 are fixed against rotation relative to the brake housing 228 and are movable relative to the brake housing 228 in the direction of the axis 180 (top-to-bottom in Fig. 4). The inner ring 280 has thereon an annular brake pad 288 facing inwardly and toward the brake pad 264, and an annular brake pad 292 facing outwardly and toward the outer ring 284. The outer ring 284 has thereon an annular brake pad 296 facing inwardly and toward the brake pad 292.
The brake apparatus 220a also includes inner and outer brake discs 300 and 304, respectively. The discs 300 and 304 have internal splines engaging the splines on the brake hub 224 so that the discs are movable relative to the brake housing 228 in the direction of the axis 180 (top-to-bottom in Fig. 4) and are fixed against rotation relative to the brake hub 224. The inner disc 300 extends between the brake pad 264 on the housing 228 and the brake pad 288 on the inner ring 280, and the outer disc 304 extends between the brake pad 292 on the ring 280 and the brake pad 296 on the ring 284. In other words, the floating rings 280 and 284 and the brake discs 300 and 304 are in an alternating arrangement. A plurality of springs 308 extend between the outer part 240 and the outer ring 284 and bias the floating rings 280 and 284 so as to squeeze the discs 300 and 304 between the brake pads to prevent rotation of the discs 300 and 304. This prevents rotation of the brake hub 224 and the transmission input shaft 172 relative to the brake housing 228, thereby braking the entire drive train 156a. The brake apparatus 220a is thus spring-set, i.e., the springs 308 set the brake in the absence of a stronger opposing force that releases the brake.
Such an opposing force is selectively provided by a plurality of piston rods 312 (only one is shown in Fig. 4) extending between the rod side of the ring piston 276 and the outer floating ring 284 such that the application of pressure to the pressure side of the ring piston 276 (the top side in Fig. 4) moves the ring piston 276, the piston rods 312 and the outer floating ring 284 against the force of the springs 308 so that the discs 300 and 304, the brake hub 224 and the transmission input shaft 172 are free to rotate relative to the brake housing 228. The piston rods 312 extend through bores in the inner ring 280 and into blind bores in the outer ring 284. The inner ring 280 is free to slide along the piston rods 312. The prior art pneumatic system is connected to the air ports 272 and thus to the cavity 268 for selectively applying pressure to the pressure side of the ring piston 276, thereby releasing the disc brake apparatus. The pneumatic system includes (see Fig. 7) a source 316 of compressed air (shown schematically in Fig. 7), which is accessible at the rear of the carbody 104. Upper and lower air conduits 320 and 324 comml]n;cate with the air source 316 via a quick relief valve 328. The upper conduit 320 communicates with the upper air port 272 in the brake housing 228, and the lower conduit 324 com--ml]n;cates with the lower air port 272 in the brake housing 228. The prior art control (not shown) is used to control air flow to the brake.
The brake apparatus 220a also includes (see Figs.
5-7) a wear indicator 332 that allows an operator to determine when brake components need to be replaced.
The wear indicator 332 includes (see Fig. 5) an indicating mem.~ber 336 fixed to the piston 276 for movement therewith. The indicating member 336 is visible through a sight glass 340 and an opening 344 in the brake housing 228. The sight glass 340 has thereon (see Fig. 6) scale lines 348 such that the operator can gauge the distance the piston 276 moves when the brake is applied. Movement beyond a predetermined distance indicates that the brake is excessively worn. The wear indicator 332 is preferably located at the rear of the brake housing 228, as shown in Fig. 7, for easy access.
The disc brake apparatus 220a is installed as follows. After the pneumatic system is disconnected from the prior art brake and the prior art transmission input shaft 26, bearing 30, bearing capsule 34, bearing retainer 38, screws 42, input sheave 46, end plate 50 and screws 54 are removed, the assembly of the new transmission input shaft 172, bearing 181, bearing capsule 182, bearing retainer 184, spacer 188 and seal 192 is positioned relative to the transmission housing 18. Then the inner part 232 of brake housing 228, the bearing retainer 184 and the bearing capsule 182 are fixed to the transmission housing 18 by the screws 244.
Next, the assembly of the brake hub 224, the discs 300 and 304, the floating rings 280 and 284, and the middle and outer parts 236 and 240 of the brake housing 228 is placed over the input shaft 172 and secured to the inner part 232 of the housing 228 by the screws 248.
The air conduits 320 and 324 are connected to the air ports 272, and the new input sheave 196 is secured to the input shaft 172 by the end plate 212 and screws 216. The belt 66 is then connected to the input sheave 196.
Various features of the invention are set forth in the following claims.
Claims (21)
1. A power mining shovel comprising a carbody, an upper frame rotatably mounted on the carbody, a dipper handle mounted on the upper frame for pivotal movement relative thereto, a dipper mounted on the dipper handle, ground-engaging means supporting the carbody for movement over the ground, a motor which is mounted on the carbody and which has an output shaft, a drive train drivingly connecting the motor output shaft to the ground-engaging means, the drive train including a drive shaft drivingly connected to the ground-engaging means, and a propel transmission which is drivingly connected to the drive shaft and which is driven by the motor output shaft, and a disc brake apparatus operably connected to the drive train for selectively preventing rotation of the drive shaft.
2. A power mining shovel as set forth in claim 1 wherein the brake apparatus is mounted directly on the propel transmission.
3. A power mining shovel as set forth in claim 1 wherein the propel transmission includes a transmission housing fixed to the carbody, and wherein the drive train also includes a transmission output shaft supported by the transmission housing and drivingly connected to the drive shaft, and a transmission input shaft which has a longitudinal axis and which is drivingly connected to the propel transmission, and wherein the disc brake apparatus is operably connected to the transmission input shaft.
4. A power mining shovel as set forth in claim 3 wherein the drive train also includes an input sheave drivingly connected to the transmission input shaft, an output sheave driven by the motor output shaft, and a belt drivingly connecting the output sheave to the input sheave, and wherein the brake apparatus extends inside the input sheave.
5. A power mining shovel as set forth in claim 4 wherein the disc brake apparatus includes a brake hub mounted on the transmission input shaft for rotation therewith, a brake housing which is fixed to the transmission housing and which surrounds the brake hub, a floating ring which is movable relative to the brake housing in the direction of the axis of the transmission input shaft and which is fixed against rotation relative to the brake housing, a brake disc which is movable relative to the brake housing in the direction of the axis of the transmission input shaft and which is fixed against rotation relative to the brake hub, a spring engaging the floating ring and biasing the floating ring so as to squeeze the disc between the floating ring and the brake housing to prevent rotation of the disc relative to the brake housing, and a device for moving the floating ring against the force of the spring so that the disc, the brake hub and the transmission input shaft are free to rotate relative to the brake housing.
6. A power mining shovel as set forth in claim 5 wherein the brake housing defines an annular cylinder cavity centered on the axis of the transmission input shaft, and wherein the device includes a ring-shaped piston which is slidably housed in the cylinder cavity and which has opposite pressure and rod sides, a plurality of piston rods extending between the rod side of the ring piston and the floating ring such that the application of pressure to the pressure side of the ring piston moves the ring piston, the piston rods and the floating ring against the force of the spring so that the disc, the brake hub and the transmission input shaft are free to rotate relative to the brake housing, and a pressure source for selectively applying pressure to the pressure side of the ring piston, thereby releasing the disc brake apparatus.
7. A power mining shovel as set forth in claim 6 wherein the brake apparatus includes a plurality of floating rings which are movable relative to the brake housing in the direction of the axis of the transmission input shaft and which are fixed against rotation relative to the brake housing, a plurality of brake discs which are movable relative to the brake housing in the direction of the axis of the transmission input shaft and which are fixed against rotation relative to the brake hub, the floating rings and the brake discs being in an alternating arrangement, and a plurality of springs engaging one of the floating rings and biasing the floating rings so as to squeeze the discs between the floating rings and the brake housing to prevent rotation of the discs, the brake hub and the transmission input shaft relative to the brake housing, and wherein the piston rods extend between the rod side of the ring piston and the one of the floating rings such that the application of pressure to the pressure side of the ring piston moves the ring piston, the piston rods and the floating rings against the force of the spring.
8. A power mining shovel as set forth in claim 6 wherein the brake housing has therein an opening, and wherein the brake apparatus includes a wear indicator, the wear indicator including an indicating member fixed to the piston for movement therewith, the indicating member being visible through the opening such that a viewer can gauge the distance the piston moves.
9. A power mining shovel as set forth in claim 1 wherein the brake apparatus includes a wear indicator.
10. A power mining shovel as set forth in claim 9 wherein the wear indicator includes an indicating member which moves in response to movement of the piston, the indicating member being visible through the opening such that a viewer can gauge the distance the piston moves.
11. A power mining shovel as set forth in claim 10 wherein the indicating member is fixed to the piston.
12. A power mining shovel as set forth in claim 1 wherein the ground-engaging means includes a crawler track assembly, the crawler track assembly including a crawler frame fixed to the carbody, a crawler shoe assembly movable relative to the crawler frame, and a drive tumbler for moving the crawler shoe assembly relative to the crawler frame, and wherein the drive shaft is drivingly connected to the drive tumbler.
13. A power mining shovel as set forth in claim 1 and further comprising a boom mounted on the upper frame, wherein the dipper handle is mounted on the boom for pivotal and translational movement relative thereto, and further comprising a hoist mechanism for pivoting the dipper handle relative to the boom, and a crowd mechanism for moving the dipper handle translationally relative to the boom.
14. A power mining shovel comprising a carbody, an upper frame rotatably mounted on the carbody, a boom mounted on the upper frame, a dipper handle mounted on the boom for pivotal and translational movement relative thereto, a dipper mounted on the dipper handle, a hoist mechanism for pivoting the dipper handle relative to the boom, a crowd mechanism for moving the dipper handle translationally relative to the boom, first and second crawler track assemblies supporting the carbody for movement over the ground, each of the crawler track assemblies including a crawler frame fixed to the carbody, a crawler shoe assembly movable relative to the crawler frame, and a drive tumbler for moving the crawler shoe assembly relative to the crawler frame, first and second motors which are mounted on the carbody and which have respective output shafts, first and second drive trains drivingly connecting the first and second motors to the first and second crawler track assemblies, respectively, each of the drive trains including a tumbler shaft drivingly connected to the associated drive tumbler, a propel transmission including a transmission housing fixed to the carbody, a transmission output shaft supported by the transmission housing and drivingly connected to the tumbler shaft, a transmission input shaft which has a longitudinal axis and which is drivingly connected to the propel transmission, an input sheave drivingly connected to the transmission input shaft, an output sheave driven by the associated motor output shaft, and a belt drivingly connecting the output sheave to the input sheave, and first and second disc brake apparatus operably connected to the first and second drive trains, respectively, each of the disc brake apparatus extending inside the associated input sheave, and each of the disc brake apparatus including a brake hub mounted on the associated transmission input shaft for rotation therewith, a brake housing which is fixed to the associated transmission housing and which surrounds the brake hub, the brake housing defining an annular cylinder cavity centered on the axis of the associated transmission input shaft, a ring-shaped piston which is slidably housed in the cylinder cavity and which has opposite pressure and rod sides, a plurality of floating rings which are movable relative to the brake housing in the direction of the axis of the associated transmission input shaft and which are fixed against rotation relative to the brake housing, a plurality of brake discs which are movable relative to the brake housing in the direction of the axis of the associated transmission input shaft and which are fixed against rotation relative to the brake hub, the floating rings and the brake discs being in an alternating arrangement, a plurality of springs engaging one of the floating rings and biasing the floating rings so as to squeeze the discs between the floating rings and the brake housing to prevent rotation of the discs, the brake hub and the associated transmission input shaft relative to the brake housing, a plurality of piston rods extending between the rod side of the ring piston and the one of the floating rings such that the application of pressure to the pressure side of the ring piston moves the ring piston, the piston rods and the one of the floating rings against the force of the springs so that the discs, the brake hub and the associated transmission input shaft are free to rotate relative to the brake housing, and a pressure source for selectively applying pressure to the pressure side of the ring piston, thereby releasing the disc brake apparatus.
15. A power mining shovel as set forth in claim 14 wherein the brake housing has therein an opening, and wherein the brake apparatus includes a wear indicator, the wear indicator including an indicating member fixed to the piston for movement therewith, the indicating member being visible through the opening such that a viewer can gauge the distance the piston moves.
16. A method of retrofitting a power mining shovel comprising a carbody, an upper frame rotatably mounted on the carbody, a dipper handle mounted on the upper frame for pivotal movement relative thereto, a dipper mounted on the dipper handle, ground-engaging means supporting the carbody for movement over the ground, a motor which is mounted on the carbody and which has an output shaft, a drive train drivingly connecting the motor to the ground-engaging means, the drive train including a drive shaft drivingly connected to the ground-engaging means, and a propel transmission which is drivingly connected to the drive shaft and which is driven by the motor output shaft, and a brake apparatus including a V-drum operably connected to the drive train, a brake member engageable with the V-drum, and a brake-applying device for selectively causing the brake member to engage the V-drum and prevent rotation of the drive shaft, the method comprising the steps of disabling the brake-applying device, and providing a disc brake apparatus operably connected to the drive train for selectively preventing rotation of the drive shaft.
17. A method as set forth in claim 16 and further comprising the step of removing the brake member.
18. A method as set forth in claim 17 wherein the V-drum is not removed.
19. A method as set forth in claim 16 wherein the brake-applying device operates in response to the absence of pressure from a pressure source, and wherein the method further comprises the steps of disconnecting the brake-applying device from the pressure source, and connecting the disc brake apparatus to the pressure source.
20. A method of retrofitting a power mining shovel comprising a carbody, an upper frame rotatably mounted on the carbody, a boom mounted on the upper frame, a dipper handle mounted on the boom for pivotal and translational movement relative thereto, a dipper mounted on the dipper handle, a hoist mechanism for pivoting the dipper handle relative to the boom, a crowd mechanism for moving the dipper handle translationally relative to the boom, a crawler track assembly supporting the carbody for movement over the ground, the crawler track assembly including a crawler frame fixed to the carbody, a crawler shoe assembly movable relative to the crawler frame, and a drive tumbler for moving the crawler shoe assembly relative to the crawler frame, a motor which is mounted on the carbody and which has an output shaft, a drive train drivingly connecting the motor to the crawler track assembly, the drive train including a tumbler shaft drivingly connected to the drive tumbler, a propel transmission including a transmission housing fixed to the carbody, a transmission output shaft supported by the transmission housing and drivingly connected to the tumbler shaft, a transmission input shaft which has a longitudinal axis and which is drivingly connected to the propel transmission, an input sheave drivingly connected to the transmission input shaft, an output sheave driven by the motor output shaft, a belt drivingly connecting the output sheave to the input sheave, and a brake apparatus operably connected to the drive train, the brake apparatus including a V-drum mounted on the transmission output shaft for rotation therewith, a brake member engageable with the V-drum, and a brake-applying device for causing the brake member to engage the V-drum and prevent rotation of the V-drum and the transmission output shaft in response to the absence of pressure from a pressure source, the method comprising the steps of disconnecting the brake-applying device from the pressure source, removing the brake member, providing a disc brake apparatus including a brake hub mounted on the transmission input shaft for rotation therewith, a brake housing which is fixed to the transmission housing and which surrounds the brake hub, the brake housing defining an annular cylinder cavity centered on the axis, a ring-shaped piston which is slidably housed in the cylinder cavity and which has opposite pressure and rod sides, a plurality of floating rings which are movable relative to the brake housing in the direction of the axis and which are fixed against rotation relative to the brake housing, a plurality of brake discs which are movable relative to the brake housing in the direction of the axis and which are fixed against rotation relative to the brake hub, the floating rings and the brake discs being in an alternating arrangement, a plurality of springs engaging one of the floating rings and biasing the floating rings so as to squeeze the discs between the floating rings and the brake housing to prevent rotation of the discs, the brake hub and the transmission input shaft relative to the brake housing, and a plurality of piston rods extending between the rod side of the ring piston and the one of the floating rings such that the application of pressure to the pressure side of the ring piston moves the ring piston, the piston rods and the one of the floating rings against the force of the springs so that the discs, the brake hub and the transmission input shaft are free to rotate relative to the brake housing, and connecting the cylinder cavity to the pressure source such that the selective application of pressure to the pressure side of the ring piston releases the disc brake apparatus.
21. A method as set forth in claim 20 wherein the V-drum is not removed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US92283897A | 1997-08-26 | 1997-08-26 | |
| US08/922,838 | 1997-08-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2243742A1 true CA2243742A1 (en) | 1999-02-26 |
Family
ID=25447636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2243742 Abandoned CA2243742A1 (en) | 1997-08-26 | 1998-07-22 | Power mining shovel brake apparatus and method of retrofitting |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU8187998A (en) |
| CA (1) | CA2243742A1 (en) |
| CO (1) | CO4840547A1 (en) |
| ZA (1) | ZA986780B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108945126A (en) * | 2017-05-19 | 2018-12-07 | 久益环球地表采矿公司 | The drive system of crawler |
-
1998
- 1998-07-22 CA CA 2243742 patent/CA2243742A1/en not_active Abandoned
- 1998-07-29 ZA ZA986780A patent/ZA986780B/en unknown
- 1998-08-10 CO CO98045545A patent/CO4840547A1/en unknown
- 1998-08-25 AU AU81879/98A patent/AU8187998A/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108945126A (en) * | 2017-05-19 | 2018-12-07 | 久益环球地表采矿公司 | The drive system of crawler |
| US11518454B2 (en) | 2017-05-19 | 2022-12-06 | Joy Global Surface Mining Inc | Crawler drive system |
| CN108945126B (en) * | 2017-05-19 | 2023-10-03 | 久益环球地表采矿公司 | Drive system for crawler |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA986780B (en) | 1999-02-02 |
| CO4840547A1 (en) | 1999-09-27 |
| AU8187998A (en) | 1999-03-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |