CN214367677U - Walking driving device and engineering machinery - Google Patents
Walking driving device and engineering machinery Download PDFInfo
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- CN214367677U CN214367677U CN202022982691.3U CN202022982691U CN214367677U CN 214367677 U CN214367677 U CN 214367677U CN 202022982691 U CN202022982691 U CN 202022982691U CN 214367677 U CN214367677 U CN 214367677U
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Abstract
The utility model relates to a drive arrangement, for solving the problem that the planet wheel carrier adopts spline centering and the manufacturing requirement that leads to is high among the current travel drive arrangement, the utility model discloses construct a travel drive arrangement and engineering machine tool, among the travel drive arrangement wherein, hydraulic motor's casing right-hand member face fixed mounting has the connection pad, and the dish edge inboard of connection pad is provided with the internal spline, be provided with on the second grade planet wheel carrier with connection pad internal spline complex external spline, the center of connection pad is provided with the locating hole that is used for second grade planet wheel carrier center location, and second grade planet wheel carrier terminal surface is provided with and stretches into annular centering portion in the locating hole, the radial lateral surface of annular centering portion and the internal face clearance fit of locating hole. The utility model discloses in, second grade planet wheel carrier realizes splining through splined connection, fixes the axle center through the tang cooperation. The cylindrical surface of the annular centering part and the positioning hole which are mutually matched is easy to process and has high precision, and the processing precision requirement is low, so that the manufacturability is improved.
Description
Technical Field
The utility model relates to a drive arrangement, more specifically say, relate to a travel drive and engineering machine tool.
Background
Hydraulic motors are often used to drive components for propelling the machine, such as a travel motor on a crawler excavator. On a crawler excavator, a traveling driving device is composed of a traveling motor and a speed reducer, a shell of the speed reducer is installed on the traveling motor through a bearing, an end cover is fixedly installed at one end of the shell, a two-stage planetary speed reducing mechanism is arranged in an inner cavity formed by the shell, the end cover and a hydraulic motor, the two-stage planetary speed reducing mechanism is adjacent to the traveling motor, the one-stage planetary mechanism is located between the two-stage planetary mechanism and the end cover, and a sun gear shaft penetrates through the two-stage planetary mechanism to be connected with the traveling mechanism. The shell is used as a common inner gear ring of the two-stage planetary mechanism, a connecting disc is installed on the end face of the walking motor, and the two-stage planetary gear carrier is provided with an external spline to be connected with the connecting disc, so that the purpose of stopping rotation of the two-stage planetary gear carrier is achieved. And the first-stage planetary mechanism is contacted with the inner side surface of the end cover to play a role in axial thrust.
In the prior walking drive device, the purpose of rotation stopping is realized between the planet wheel carrier and the connecting disc through splines, and the connecting splines also have the centering function, so that the processing and manufacturing requirements of the connecting splines between the connecting disc and the secondary planet wheel carrier are high; in addition, the rotating first-stage planetary mechanism rubs with the inner side surface of the end cover, and the hardness of the end cover is lower than that of a rotating part of the planetary mechanism, so that the end cover is seriously abraded, and the service life is shortened.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is that the planet wheel carrier adopts spline centering and the high problem of manufacturing requirement that leads to among the current travel drive device, and provides a travel drive device and engineering machine tool to reduce the manufacturing requirement of second grade planet wheel carrier.
The utility model discloses a realize that the technical scheme of its purpose is like: a walking driving device is constructed and comprises a hydraulic motor and a speed reducer, wherein the speed reducer comprises a speed reducer shell, an end cover, a primary planetary speed reducing mechanism and a secondary planetary speed reducing mechanism which are integrated with an inner gear ring; the left end of the speed reducer shell is rotatably sleeved at the right end of the shell of the hydraulic motor through an angular contact ball bearing, and the right end of the speed reducer shell is fixedly connected with the end cover; the two-stage planetary reduction mechanism is arranged in the speed reducer shell, the two-stage planetary gears are engaged with the speed reducer shell, the secondary planet carrier is adjacent to the hydraulic motor, the primary planetary reduction mechanism is positioned at the right side of the secondary planetary reduction mechanism and is adjacent to the end cover, the primary sun gear shaft passes through the secondary sun gear and is connected with an output shaft spline of the hydraulic motor, the secondary sun gear is connected with the primary planet carrier spline, a connecting disc is fixedly arranged on the right end surface of the shell of the hydraulic motor, an internal spline is arranged on the inner side of the disc edge of the connecting disc, an external spline matched with the internal spline of the connecting disc is arranged on the secondary planet wheel carrier, it is characterized in that the center of the connecting disc is provided with a positioning hole for positioning the center of the secondary planet wheel carrier, and the end surface of the secondary planet carrier is provided with an annular centering part extending into the positioning hole, and the radial outer side surface of the annular centering part is in clearance fit with the inner wall surface of the positioning hole. The utility model discloses in, second grade planet wheel carrier passes through the spline and is connected with the connection pad, realizes splines purpose, through annular centering portion and locating hole cooperation, realizes second grade planet wheel carrier's centering axle purpose. The surfaces of the annular centering part and the positioning hole which are matched with each other are cylindrical surfaces, so that the processing is easy to realize, and the precision is high. The external spline on the secondary planet carrier only plays a role of rotation stopping, and the machining precision requirement is low, so that the manufacturability is improved.
In the travel driving device, the edge of the connecting disc radially protrudes out of the end face of the hydraulic motor, and the right end of the inner ring of the angular contact ball bearing is in limit contact with the left side face of the connecting disc. And selecting a corresponding adjusting gasket between the connecting disc and the angular contact ball bearing to adjust the clearance of the angular contact ball bearing.
In the traveling driving device, a thrust plate for contacting with the primary planetary reduction mechanism is fixedly mounted on the left side surface of the end cover. The hardness of the thrust plate is the same as or similar to that of a rotating component which is in contact with the thrust plate on the primary planetary reduction mechanism, so that the hardness difference of two friction surfaces is reduced, the wear resistance is improved, and the service life of the planetary reduction mechanism is prolonged. Furthermore, the end face of the primary planet gear shaft is fixedly provided with a stop pin which is used for being in contact with the thrust plate, and the stop pin and the thrust plate can be made of the same material and have higher wear-resisting hardness.
In the walking driving device, the secondary planet wheel carrier and the secondary planet gear shaft are of an integrated structure, the secondary planet gear is installed on the secondary planet gear shaft through the double-row outer-ring-free cylindrical roller bearing, and a gasket used for abutting against the inner ring of the double-row outer-ring-free cylindrical roller bearing and limiting the axial direction is fixedly installed on the right end face of the secondary planet gear shaft through a bolt.
In the traveling driving device, a limiting retainer ring for abutting against the left end face of the secondary sun gear is fixed on the secondary planet carrier.
In the traveling driving device, the second-stage sun gear is cylindrical, the right end of the second-stage sun gear is provided with an external spline which is in fit connection with the internal spline on the first-stage planet carrier, and the second-stage sun gear is provided with a retaining ring which is used for abutting against and limiting the left end face of the first-stage planet carrier.
In the walking driving device, the first-stage planetary gear shaft is fixedly arranged on the first-stage planetary gear carrier through interference fit, the first-stage planetary gear is rotatably arranged on the first-stage planetary gear shaft through the cylindrical roller bearing without the outer ring, and the right end of the first-stage planetary gear shaft is provided with the check ring which is used for being in axial limit contact with the right end of the inner ring of the cylindrical roller bearing without the outer ring.
In the walking driving device, the upper part of the end cover is provided with an oil filling port, the bottom of the end cover is provided with an oil discharging port, and the oil filling port and the oil discharging port are both provided with detachable screw plugs.
The utility model discloses a realize that the technical scheme of its purpose is like: the engineering machinery is characterized by comprising the walking driving device, and the engineering machinery can be an excavator, a bulldozer and other machinery which adopts a hydraulic motor to drive and walk.
Compared with the prior art, the utility model discloses in, second grade planet wheel carrier passes through the spline and is connected with the connection pad, realizes spline purpose, through annular centering portion and locating hole cooperation, realizes second grade planet wheel carrier's axle center purpose of deciding. The surfaces of the annular centering part and the positioning hole which are matched with each other are cylindrical surfaces, so that the processing is easy to realize, and the precision is high. The external spline on the secondary planet carrier only plays a role of rotation stopping, and the machining precision requirement is low, so that the manufacturability is improved.
Drawings
Fig. 1 is a schematic structural view of the middle walking driving device of the present invention.
Fig. 2 is a schematic structural diagram of the middle reducer of the present invention.
Fig. 3 is a partially enlarged schematic view of the connection structure of the second-stage planetary carrier and the connection plate of the present invention.
Fig. 4 is a schematic view of the connection structure between the first-stage planetary gear carrier and the first-stage planetary gear of the present invention.
Fig. 5 is a sectional view of the connection structure of the first-stage planetary gear carrier and the first-stage planetary gear of the present invention.
Fig. 6 is a schematic view of the matching structure of the middle-stage planetary mechanism and the thrust plate of the present invention.
Part names and serial numbers in the figure:
the device comprises a hydraulic motor 1, a floating oil seal 2, a reducer shell 3, an angular contact bearing 4, an adjusting gasket 5, a bolt 6, a connecting disc 7, a positioning hole 72, a secondary planet carrier 8, an external spline 81, an annular centering portion 82, a secondary planet gear 9, a double-row cylindrical roller bearing 10 without an outer ring, a gasket 11, a bolt 12, an O-shaped ring 13, an end cover 14, an oil filling port plug screw 15, a retainer ring 16, a stop pin 17, a primary planet gear shaft 18, a cylindrical roller bearing 19 without an outer ring, a primary planet gear 20, a thrust plate 21, a bolt 22, a retainer ring 23, a primary planet carrier 24, an oil discharging port plug screw 25, a secondary sun gear 27, a limiting retainer ring 28 and a hydraulic motor shell 101.
Detailed Description
The following description of the embodiments refers to the accompanying drawings.
Fig. 1 is a schematic structural view showing a travel drive device of a construction machine according to the present embodiment. The engineering machinery can be an excavator, a bulldozer and the like, and the walking driving device is used for driving the crawler belt to realize the walking of the machinery.
As shown in fig. 1, the travel drive device includes a hydraulic motor 1 and a speed reducer. As shown in fig. 2, the reduction gear includes a reduction gear case 3, an end cover 14, a primary planetary reduction mechanism, and a secondary planetary reduction mechanism. The left end of the speed reducer shell 3 is rotatably sleeved at the right end of the shell of the hydraulic motor 1 through an angular contact ball bearing 4 and is radially sealed by the floating oil seal 2.
The right end of the speed reducer shell 3 is fixedly connected with the end cover 14 through a bolt; the end face sealing is realized between the two through an O-shaped ring 13.
The reducer shell 3 and the inner gear ring are of an integral structure and serve as a common inner gear ring of the two-stage planetary reduction mechanism, the two-stage planetary reduction mechanism is installed in the reducer shell 3, the two-stage planetary gears are meshed with the reducer shell, the secondary planet carrier 8 is adjacent to the hydraulic motor 1, and the primary planetary reduction mechanism is located on the right side of the secondary planetary reduction mechanism and adjacent to the end cover 14. The shell is used as a rotating output end of the walking driving device, and a chain wheel is fixedly arranged on the shell to drive the crawler belt to realize walking.
The first-stage sun gear shaft 26 penetrates through the second-stage sun gear 27 to be in spline connection with the output shaft of the hydraulic motor 1, the second-stage sun gear 27 is in spline connection with the first-stage planet gear carrier 24, and the connecting disc 7 is fixedly mounted on the right end face of the shell of the hydraulic motor 1 through a bolt 6. As shown in fig. 3, an inner spline 71 is arranged on the inner side of the rim of the connecting plate 7, an outer spline 81 matched with the inner spline 71 of the connecting plate 7 is arranged on the secondary planet carrier 8, and the outer spline 81 on the secondary planet carrier 8 is matched and connected with the inner spline 71 on the connecting plate 7, so that the rotation stop of the secondary planet carrier is realized and the secondary planet carrier is fixedly mounted relative to a shell of the hydraulic motor.
The center of the connecting disc 7 is provided with a positioning hole 72 for positioning the center of the secondary planet carrier, the left end face of the secondary planet carrier 8 is provided with an annular centering part 82 extending into the positioning hole, and the radial outer side face of the annular centering part 82 is in clearance fit with the inner wall face of the positioning hole 72. The second-stage planetary carrier is matched with the positioning hole in the connecting disc through the annular centering portion 82 on the left end face of the second-stage planetary carrier, so that the second-stage planetary carrier and the connecting disc are in spigot clearance fit, and the axis of the second-stage planetary carrier is centered. Because the surfaces of the annular centering part 82 and the positioning holes which are matched with each other are cylindrical surfaces, the processing is easy to realize, and the precision is high. The external spline on the secondary planet carrier only plays a role of rotation stopping, and the requirement on machining precision is low. Compared with the prior art in which the spline connection is used for realizing rotation stopping and centering between the secondary planet wheel carrier and the connecting disc, the structure of the seam allowance clearance fit centering and the spline connection rotation stopping in the embodiment has the advantages of low requirement on processing precision and high manufacturability.
As shown in fig. 3, the rim of the connecting disc 7 radially protrudes from the right end surface of the hydraulic motor housing 101, and the right end of the inner ring of the angular ball bearing 4 is in limit contact with the left end surface of the connecting disc 7. And selecting a corresponding adjusting gasket 5 between the connecting disc 7 and the angular contact ball bearing 4 to adjust the play of the angular contact ball bearing 4.
As shown in fig. 2, the secondary planet carrier 8 and the secondary planet gear shaft are of an integral structure, the secondary planet gear 9 is mounted on the secondary planet gear shaft through a double-row outer-ring-free cylindrical roller bearing 10, and a gasket 11 for abutting against an inner ring of the double-row outer-ring-free cylindrical roller bearing 10 and axially limiting is fixedly mounted on the right end face of the secondary planet gear shaft through a bolt 12. An axial limiting retainer ring 28 which is used for abutting against the left end face of the secondary sun gear is fixed on the secondary planet carrier 8. The second-stage sun gear 27 is cylindrical, the left section of the second-stage sun gear is meshed with the second-stage planetary gear, the right end of the second-stage sun gear is provided with an external spline which is in matched connection with the internal spline on the first-stage planetary gear carrier 24, and the second-stage sun gear 27 is provided with a retaining ring 23 which is used for abutting against and limiting the left end face of the first-stage planetary gear carrier 24.
As shown in fig. 4 to 6, the primary planet gear shaft 18 is fixedly mounted on the primary planet carrier 24 by interference fit, the primary planet gear 20 is rotatably mounted on the primary planet gear shaft 18 by an outer-ring-free cylindrical roller bearing 19, and a retainer ring 16 for axially limiting and contacting with the right end of the inner ring of the outer-ring-free cylindrical roller bearing 19 is mounted at the right end of the primary planet gear shaft 18. The left end of the primary sun gear shaft 26 passes through the secondary sun gear 27 and is connected with an output shaft spline of the hydraulic motor, and the right end is provided with teeth which are meshed with the primary planetary gear 20.
As shown in fig. 6, a thrust plate 21 for contacting the primary planetary reduction mechanism is fixedly mounted on the left side surface of the end cover 14 by a bolt 22. The end face of the primary planet gear shaft is fixedly provided with a stop pin 17 which is used for contacting with a thrust plate 21. The thrust plate 21 and the stop pin 17 are made of wear-resistant materials with similar or same hardness, when the speed reducer works and the primary planetary speed reducing mechanism rotates, the stop pin is in contact with the thrust plate, and due to the fact that the hardness is close to that of the stop pin and the primary planetary speed reducing mechanism are made of the wear-resistant materials, the hardness difference of two friction surfaces is reduced, the wear resistance is improved, and the service life of the friction surfaces is prolonged.
As shown in FIG. 6, the top of the end cap 14 is provided with a filler opening and the bottom is provided with a drain opening, with a removable filler plug 15 installed in the filler opening and a removable drain plug 25 installed in the drain opening. When the machine is stopped for maintenance, the screw plug of the oil discharge port is disassembled for oil discharge, the screw plug of the oil filling port above is disassembled, and new oil is filled from the oil filling port.
Claims (10)
1. A walking driving device comprises a hydraulic motor (1) and a speed reducer, wherein the speed reducer comprises a speed reducer shell (3) which is integrated with an inner gear ring, an end cover (14), a primary planetary speed reducing mechanism and a secondary planetary speed reducing mechanism; the left end of the speed reducer shell (3) is rotatably sleeved at the right end of the shell of the hydraulic motor (1) through an angular contact ball bearing (4), and the right end of the speed reducer shell is fixedly connected with an end cover (14); the two-stage planetary reduction mechanism is arranged in a reducer shell (3), the two-stage planetary gears are engaged with the reducer shell, a secondary planet carrier (8) is adjacent to a hydraulic motor (1), a primary planetary reduction mechanism is positioned on the right side of the secondary planetary reduction mechanism and adjacent to an end cover (14), a primary sun gear shaft (26) penetrates through a secondary sun gear (27) to be in spline connection with an output shaft of the hydraulic motor (1), the secondary sun gear (27) is in spline connection with a primary planet carrier (24), a connecting disc (7) is fixedly arranged on the right end face of the shell of the hydraulic motor (1), an inner spline is arranged on the inner side of the disc edge of the connecting disc (7), an outer spline matched with the inner spline of the connecting disc (7) is arranged on the secondary planet carrier (8), and the center of the connecting disc (7) is provided with a positioning hole (72) for positioning the center of the secondary planet carrier, an annular centering portion (82) extending into the positioning hole is arranged on the left end face of the secondary planet carrier (8), and the radial outer side face of the annular centering portion (82) is in clearance fit with the inner wall face of the positioning hole (72).
2. The walking drive device of claim 1, characterized in that the rim of the connecting disc (7) radially protrudes out of the right end face of the hydraulic motor (1), and the right end of the inner ring of the angular contact ball bearing (4) is in limit contact with the left side face of the connecting disc (7).
3. The travel drive unit according to claim 1, wherein a thrust plate (21) for contacting the primary planetary reduction mechanism is fixedly mounted on a left side surface of the end cover (14).
4. The travel drive unit according to claim 3, wherein a stopper pin (17) for contacting with the thrust plate (21) is fixedly mounted to an end surface of the primary planetary gear shaft.
5. The walking drive device of claim 1, characterized in that the secondary planet carrier (8) and the secondary planet gear shaft are an integral structure, the secondary planet gear (9) is mounted on the secondary planet gear shaft through a double-row outer-ring-free cylindrical roller bearing (10), and a gasket (11) for abutting against the inner ring of the double-row outer-ring-free cylindrical roller bearing (10) and axially limiting is fixedly mounted on the right end face of the secondary planet gear shaft through a bolt (12).
6. The travel drive of any one of claims 1 to 5, characterized in that an axial limit retainer ring (28) for abutting against the left end face of the secondary sun gear is fixed to the secondary planet carrier (8).
7. The walking drive device of claim 6, characterized in that the secondary sun gear (27) is cylindrical, the right end of the secondary sun gear is provided with an external spline which is matched and connected with the internal spline on the primary planet carrier (24), and the secondary sun gear (27) is provided with a retaining ring (23) which is used for abutting against and limiting the left end surface of the primary planet carrier (24).
8. The walking drive device of claim 4 or 7, characterized in that the primary planet gear shaft (18) is fixedly mounted on the primary planet carrier (24) through interference fit, the primary planet gear (20) is rotatably mounted on the primary planet gear shaft (18) through a cylindrical roller bearing (19) without an outer ring, and a retainer ring (16) for axially limiting and contacting with the right end of the inner ring of the cylindrical roller bearing (19) without an outer ring is mounted at the right end of the primary planet gear shaft (18).
9. The walking driving device as claimed in claim 1 or 3, wherein the end cap (14) is provided with an oil filling port at the upper part and an oil discharging port at the bottom, and the oil filling port and the oil discharging port are both provided with detachable screw plugs.
10. A working machine characterized by having the travel drive unit of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022982691.3U CN214367677U (en) | 2020-12-14 | 2020-12-14 | Walking driving device and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022982691.3U CN214367677U (en) | 2020-12-14 | 2020-12-14 | Walking driving device and engineering machinery |
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| Publication Number | Publication Date |
|---|---|
| CN214367677U true CN214367677U (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022982691.3U Active CN214367677U (en) | 2020-12-14 | 2020-12-14 | Walking driving device and engineering machinery |
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| CN (1) | CN214367677U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114151527A (en) * | 2021-12-09 | 2022-03-08 | 浙江盘毂动力科技有限公司 | Zero-differential-speed stepless-steering hydraulic mechanical combined type comprehensive transmission device and vehicle |
-
2020
- 2020-12-14 CN CN202022982691.3U patent/CN214367677U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114151527A (en) * | 2021-12-09 | 2022-03-08 | 浙江盘毂动力科技有限公司 | Zero-differential-speed stepless-steering hydraulic mechanical combined type comprehensive transmission device and vehicle |
| CN114151527B (en) * | 2021-12-09 | 2023-10-13 | 浙江盘毂动力科技有限公司 | Hydraulic mechanical combined type comprehensive transmission device for zero differential speed stepless steering and vehicle |
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