Speed reducer for excavator walking

Abstract

The utility model relates to the technical field of speed reducers, and particularly discloses a speed reducer for excavator walking, which comprises a motor seat and a driving shaft rotationally arranged on the motor seat, and is characterized by further comprising a hub seat, a hub sleeve, a gear ring, a primary planet carrier assembly and a secondary planet carrier assembly, one end of the driving shaft extends out of the motor seat, penetrates through the first-stage planet carrier assembly and then is in transmission connection with the second-stage planet carrier assembly; the hub seat is rotationally arranged on the motor seat in a sleeving mode, a gear ring is coaxially arranged at the end, away from the motor seat, of the hub seat, and a plurality of first planetary gears on the first-stage planet carrier assembly and a plurality of second planetary gears on the second-stage planet carrier assembly are both meshed with the gear ring; the gear ring and the hub seat are sleeved with the hub sleeve, and the hub sleeve is fixedly connected with the gear ring and the hub seat at the same time. The problems that an inner gear ring of a traditional speed reducer transmits torque to a hub through a fixing screw, the overall structural strength is low, the failure rate is high, and the cost is high are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of speed reducer, specifically, relates to a speed reducer for excavator walking. BACKGROUND

[0002] The traditional excavator walking speed reducer assembly system requires the gear ring to have high precision because of the cooperation of the gear ring and the primary and secondary planetary gears, so the gear ring and the hub are generally separated, and the three are fixed to each other by sequentially penetrating the end cover, the gear ring and the hub with the fixing screw, and then the gear ring transmits the torque to the hub through the fixing screw, so the overall structural strength is low, the failure rate is high, the strength requirement of the fixing screw is high, and the cost is high. SUMMARY

[0003] The utility model discloses a kind of speed reducers for excavator walking, it solves the mode that the internal gear ring of traditional speed reducer is transmitted torque by fixing screw in hub, overall structural strength is low, failure rate is high, leading to higher problem such as cost.

[0004] The utility model discloses the following technical scheme realizes: a kind of speed reducers for excavator walking, including motor seat and drive shaft rotationally arranged on motor seat, it is characterized in that, further including hub seat, hub sleeve, gear ring, primary planetary carrier assembly and secondary planetary carrier assembly, the drive shaft one end extends out the motor seat and is connected with transmission after penetrating the primary planetary carrier assembly and secondary planetary carrier assembly;

[0005] The hub seat rotationally sets on the motor seat, the gear ring is coaxially provided on the end away from the motor seat of the hub seat, the first planetary gear on the primary planetary carrier assembly and the second planetary gear on the secondary planetary carrier assembly are all engaged with the gear ring.

[0006] The hub sleeve sets on the gear ring and hub seat, and the hub sleeve is fixedly connected with the gear ring and hub seat.

[0007] Further, the hub sleeve and the gear ring and hub seat are fixedly connected in the mode of spline connection.

[0008] Further, the hub sleeve inner cavity is provided with spline cavity, the first spline shaft is provided on the gear ring outer wall, the second spline shaft is provided on the hub seat, and the first spline shaft and the second spline shaft are all embedded with the spline cavity.

[0009] Further, it further includes end cover, the end cover is coaxially arranged on the end of the hub sleeve away from the hub seat, and the end cover is fixedly connected with the hub sleeve by a plurality of fixing screws.

[0010] Further, the first end face tooth and the second end face tooth are in meshing connection.

[0011] Further, the end cover is in abutment with the gear ring.

[0012] Further, the primary planetary carrier assembly further comprises a first sun gear, the first sun gear is rotatably sleeved on the driving shaft, and a plurality of the first planetary gears are circumferentially arranged on the motor seat and in meshing connection with the first sun gear.

[0013] Further, the secondary planetary carrier assembly further comprises a second planetary carrier and a second sun gear, the second planetary carrier is fixedly sleeved on the first sun gear, and a plurality of the second planetary gears are circumferentially arranged on the second planetary carrier.

[0014] The second sun gear is fixedly sleeved on the driving shaft, and the second planetary gears are in meshing connection with the second sun gear.

[0015] The technical scheme of the utility model has at least the following advantages and beneficial effects:

[0016] 1. The hub sleeve is connected with the gear ring and the hub seat through the spline, and then the hub sleeve is sleeved on the gear ring and the hub seat after the coaxial arrangement of the gear ring and the hub sleeve, so that the torque is transmitted between the gear ring and the hub seat, the hub sleeve is used, the structure is simple to assemble and disassemble, the structure strength is higher, the torque transmission is more reliable, the failure rate is low, and the maintenance cost is low.

[0017] 2. The first end face tooth and the second end face tooth are coaxially connected with the gear ring and the hub seat, and then the hub sleeve is sleeved between the gear ring and the hub seat, the end cover ensures that the gear ring and the hub seat are always in abutment, and the first end face tooth and the second end face tooth are always in meshing transmission, and the torque is transmitted between the gear ring and the hub seat not only through the hub sleeve but also through the first end face tooth and the second end face tooth, so that the torque transmission is more reliable. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as the limitation to the scope, and for the ordinary skilled in the art, other related drawings can be obtained without the creative labor on the premise of the drawings.

[0019] Figure 1 The utility model provides a structure schematic view of excavator walking reduction gear;

[0020] Figure: 1, motor seat, 2, transmission shaft, 3, wheel hub seat, 31, second spline shaft, 32, second end face tooth, 4, wheel hub sleeve, 41, spline cavity, 5, gear ring, 51, first spline shaft, 52, first end face tooth, 6, primary planetary carrier assembly, 61, first planetary gear, 62, first sun gear, 7, secondary planetary carrier assembly, 71, second planetary gear, 72, second planetary carrier, 73, second sun gear, 8, end cover. DETAILED DESCRIPTION

[0021] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0023] Reference Figure 1 As shown in the drawings, the present embodiment provides a speed reducer for excavator walking, comprising a motor seat 1 and a driving shaft 2 rotatably arranged on the motor seat 1. The motor seat 1 is arranged on the frame of the excavator, and the driving shaft 2 serves as a power transmission shaft, which is in transmission connection with the power output end of the motor on the motor seat 1. The speed reducer further comprises a wheel hub seat 3, a wheel hub sleeve 4, a gear ring 5, a primary planetary carrier assembly 6 and a secondary planetary carrier assembly 7. One end of the driving shaft 2 extends out of the motor seat 1 and is in transmission connection with the primary planetary carrier assembly 6 and the secondary planetary carrier assembly 7 after passing through the primary planetary carrier assembly 6.

[0024] More specifically, the wheel hub seat 3 is rotatably sleeved on the motor seat 1, and the gear ring 5 is coaxially arranged at the end of the wheel hub seat 3 away from the motor seat 1. The plurality of first planetary gears 61 on the primary planetary carrier assembly 6 and the plurality of second planetary gears 71 on the secondary planetary carrier assembly 7 are all in meshing engagement with the gear ring 5. The primary planetary carrier assembly 6 further comprises a first sun gear 62, which is rotatably sleeved on the driving shaft 2. The plurality of first planetary gears 61 are arranged around the motor seat 1, and the first planetary gears 61 are in meshing engagement with the first sun gear 62.

[0025] More specifically, as shown in the drawings, Figure 1As shown, the two-stage planetary carrier assembly 7 further comprises a second planetary carrier 72 and a second sun gear 73, the second planetary carrier 72 is fixedly sleeved on the first sun gear 62, and a plurality of second planetary gears 71 are arranged around the second planetary carrier 72; the second sun gear 73 is fixedly sleeved on the drive shaft 2, and the second planetary gears 71 are engaged with the second sun gear 73.

[0026] In specific implementation, the drive shaft 2 drives the second sun gear 73 to rotate, the second sun gear 73 drives the second planetary carrier 72 to rotate through the plurality of second planetary gears 71, the second planetary carrier 72 is spline-connected with the first sun gear 62, thereby driving the first sun gear 62 to rotate at a low speed, the first sun gear 62 drives the gear ring 5 to rotate at a low speed through the plurality of first planetary gears 61, thereby achieving the driving of the hub seat 3.

[0027] As shown, Figure 1 The hub sleeve 4 is sleeved on the gear ring 5 and the hub seat 3, and is fixedly connected with the gear ring 5 and the hub seat 3, the fixed connection between the hub sleeve 4 and the gear ring 5 and the hub seat 3 is spline connection, and the hub sleeve 4 is fixedly connected with the hub seat 3 through a plurality of bolts at the end close to the motor seat. More specifically, the inner cavity of the hub sleeve 4 is provided with a spline cavity 41, the outer wall of the gear ring 5 is provided with a first spline shaft 51, and the hub seat 3 is provided with a second spline shaft 31, and the first spline shaft 51 and the second spline shaft 31 are embedded in the spline cavity 41. Then, when the gear ring 5 and the hub sleeve 4 are coaxially arranged, the hub sleeve 4 is sleeved on the gear ring 5 and the hub seat 3 at the same time, so that the torque can be transmitted between the gear ring 5 and the hub seat 3. The use of the hub sleeve 4 is simple to assemble, has higher structural strength, more reliable torque transmission, and low failure rate, thereby reducing maintenance cost.

[0028] As shown, Figure 1 Further comprising an end cover 8, the end cover 8 is coaxially arranged at the end of the hub sleeve 4 away from the hub seat 3, and the end cover 8 is fixedly connected with the hub sleeve 4 through a plurality of fixing screws, and the end cover 8 abuts against the gear ring 5. In specific implementation, the end of the gear ring 5 close to the hub seat 3 is provided with a first end face tooth 52, and the end of the hub seat 3 close to the gear ring 5 is provided with a second end face tooth 32, and the first end face tooth 52 is engaged with the second end face tooth 32. Therefore, the torque transmission between the gear ring 5 and the hub seat 3 is not only through the hub sleeve 4, but also through the first end face tooth 52 and the second end face tooth 32, so that the torque transmission is more reliable; at the same time, the first end face tooth 52 and the second end face tooth 32 can facilitate the coaxial butt joint of the gear ring 5 and the hub seat 3 during the initial coaxial installation of the gear ring 5 and the hub seat 3, thereby facilitating the subsequent sleeving between the hub sleeve 4 and the gear ring 5 and the hub seat 3. The end cover 8 can ensure that the gear ring 5 and the hub seat 3 always abut against each other, thereby ensuring that the first end face tooth 52 and the second end face tooth 32 always engage and drive.

[0029] The above merely is preferred embodiment of the present utility model, and is not for limiting the present utility model, for the person skilled in the art, the present utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A reduction gear for a walking device of a shovel, comprising a motor base (1) and a drive shaft (2) which is rotatably provided on the motor base (1), characterized in that, It also includes a hub seat (3), a hub sleeve (4), a gear ring (5), a primary planetary carrier assembly (6) and a secondary planetary carrier assembly (7), one end of the drive shaft (2) extends out of the motor seat (1) and is connected in transmission after passing through the primary planetary carrier assembly (6) and the secondary planetary carrier assembly (7); The hub seat (3) is rotatably sleeved on the motor seat (1), and the gear ring (5) is coaxially arranged at one end of the hub seat (3) away from the motor seat (1), and a plurality of first planetary gears (61) on the primary planetary carrier assembly (6) and a plurality of second planetary gears (71) on the secondary planetary carrier assembly (7) are all in meshing engagement with the gear ring (5); The hub sleeve (4) is sleeved on the gear ring (5) and the hub seat (3), and is fixedly connected with the gear ring (5) and the hub seat (3).

2. The excavator travel reduction gear according to claim 1, characterized by The hub sleeve (4) is fixedly connected with the gear ring (5) and the hub seat (3) in the form of spline connection.

3. The reduction gear for a walking device of a shovel according to claim 2, characterized by The hub sleeve (4) is provided with a spline cavity (41) in the inner cavity, the gear ring (5) is provided with a first spline shaft (51) on the outer wall, and the hub seat (3) is provided with a second spline shaft (31), and the first spline shaft (51) and the second spline shaft (31) are both embedded with the spline cavity (41).

4. The reduction gear for a walking device of a shovel according to claim 3, characterized by It also includes an end cover (8), which is coaxially arranged at one end of the hub sleeve (4) away from the hub seat (3), and is fixedly connected with the hub sleeve (4) through a plurality of fixing screws.

5. The excavator travel reduction gear of claim 4 wherein, The gear ring (5) is provided with a first end face tooth (52) at one end close to the hub seat (3), and the hub seat (3) is provided with a second end face tooth (32) at one end close to the gear ring (5), and the first end face tooth (52) is in meshing engagement with the second end face tooth (32).

6. The excavator travel reduction gear of claim 5 wherein, The end cover (8) is in abutment with the gear ring (5).

7. The speed reducer for a walking excavator according to any one of claims 1 to 6, characterized in that, The primary planetary carrier assembly (6) further includes a first sun gear (62), which is rotatably sleeved on the drive shaft (2), and a plurality of first planetary gears (61) are circumferentially arranged on the motor seat (1), and the first planetary gears (61) are in meshing engagement with the first sun gear (62).

8. The excavator travel reduction gear of claim 7 wherein, The secondary planetary carrier assembly (7) further includes a second planetary carrier (72) and a second sun gear (73), the second planetary carrier (72) is fixedly sleeved on the first sun gear (62), and a plurality of second planetary gears (71) are circumferentially arranged on the second planetary carrier (72); The second sun gear (73) is fixedly sleeved on the drive shaft (2), and the second planetary gears (71) are in meshing engagement with the second sun gear (73).

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