CN210799910U

CN210799910U - Walking motor speed reducer for excavator

Info

Publication number: CN210799910U
Application number: CN201920780777.2U
Authority: CN
Inventors: 丘伟平; 余红波; 马宗宇
Original assignee: Longgong Shanghai Precision Hydraulic Components Co ltd
Current assignee: Longgong Shanghai Precision Hydraulic Components Co ltd
Priority date: 2019-05-28
Filing date: 2019-05-28
Publication date: 2020-06-19
Anticipated expiration: 2029-05-28

Abstract

The utility model discloses a walking motor speed reducer for excavator, which is characterized in that, the speed reducer comprises an inner gear ring, both sides of the inner gear ring are respectively connected with a motor seat and an end cover, a planetary speed reducing mechanism is arranged in the inner gear ring, the planetary speed reducing mechanism comprises a primary planetary speed reducing mechanism and a secondary planetary speed reducing mechanism, the primary planetary speed reducing mechanism is respectively meshed with a primary sun gear and the inner gear ring through a primary planetary gear, one end of the primary sun gear is connected with a transmission shaft of the motor, and the other end of the primary sun gear is connected with the end cover; the secondary planetary reduction mechanism is respectively meshed with the secondary sun gear and the inner gear ring through a secondary planetary gear, and the secondary planetary reduction mechanism is connected with the cylindrical boss of the motor base. The utility model has the advantages of reasonable and simple structure compactness, impact little, stability is high, transmission efficiency is high, with low costs, production and processing are convenient, have solved one-level planetary reduction gears fragile, locking nut not hard up lead to the problem of gear reducer damage to the normal work and the stability of walking motor speed reducer have been guaranteed.

Description

Walking motor speed reducer for excavator

Technical Field

The utility model relates to a walking motor speed reducer for excavator belongs to engineering machine tool technical field.

Background

At present, a traveling motor reducer for an excavator is mostly composed of main parts such as a motor transmission shaft, a sun gear, a primary planetary reduction mechanism, a secondary planetary reduction mechanism, a bearing, a locking nut, a floating oil seal, an inner gear ring, a primary baffle, a secondary baffle, an end cover and the like, and the traveling motor reducer has the advantages of compact structure, low speed and large torque. However, the floating primary planetary reduction mechanism of the traveling motor reducer is easy to axially float under the action of external force, and the primary baffle and the needle bearing are easy to damage in the axial float process, so that the inside of the gear of the reducer is damaged. On the other hand, the axial clearance of the adjusting bearing of the walking motor reducer is usually adjusted by a locking nut, and the locking nut is easy to loosen to cause larger axial movement of the planetary reduction mechanism.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the problem that the primary planetary reducing mechanism is easy to damage due to axial movement and the locking nut is easy to loosen is solved.

In order to solve the technical problem, the technical scheme of the utility model is that: the walking motor speed reducer for the excavator is characterized by comprising an inner gear ring, wherein two sides of the inner gear ring are respectively connected with a motor seat and an end cover; the secondary planetary reduction mechanism is respectively meshed with the secondary sun gear and the inner gear ring through the secondary planetary gear, the secondary planetary reduction mechanism is connected with the cylindrical boss of the motor seat, a floating seal matching ring is arranged in the end surface of one side, connected with the motor seat, of the inner gear ring, a floating oil seal is arranged in the floating seal matching ring, and a groove matched with the floating oil seal is arranged on the end surface of one side, connected with the inner gear ring, of the motor seat; two angular contact bearings are arranged in the inner gear ring, one angular contact bearing is connected with the motor seat, the other angular contact bearing is used for being connected with a locking nut, and the locking nut is fixedly connected with the motor seat through threads.

Preferably, the primary planetary reduction mechanism comprises a planetary carrier, a primary planetary carrier cylindrical boss is arranged on the planetary carrier, a second steel ring is arranged on the primary planetary carrier cylindrical boss, a second needle bearing is connected with the second steel ring, and a primary planetary gear is connected with the second needle bearing; the end face of the cylindrical boss of the primary planet carrier is fixedly connected with the primary baffle through a bolt I.

And the secondary sun gear is connected with a planet carrier spline of the primary planetary reduction mechanism.

More preferably, the secondary planetary reduction mechanism comprises a secondary planetary gear, the secondary planetary gear is connected with a first needle bearing, and the first needle bearing is connected with the cylindrical boss of the motor seat through a first steel ring; the end face of the cylindrical boss of the motor seat is fixedly connected with the second-stage baffle through a second bolt.

Preferably, the locking nut is uniformly provided with a semicircular slot hole for embedding the plug.

Preferably, a buffer ring is arranged between the end cover and the planetary reduction mechanism.

Preferably, a buffer piece is arranged between one end of the primary sun gear and the end cover, and a groove matched with the buffer piece is formed in the inner side of the end cover.

Preferably, a sealing ring is arranged between the floating seal matching ring and the inner gear ring.

The utility model has the advantages of reasonable structure simple compactness, strike for a short time, stability is high, transmission efficiency is high, and is with low costs, production and processing are convenient, adopt the plastic stopper buffer structure between planetary reduction gears and the end cover, one, second grade planetary reduction gears baffle passes through bolt fastening structure, the big bearing of speed reducer passes through steel lock nut adjustment axial clearance, lock nut is through the embedded fixed locking of 4 plug screws, one-level planetary reduction gears fragile has been solved, lock nut is not hard up and leads to the problem that the speed reducer damaged, thereby the normal work and the stability of walking motor speed reducer have been guaranteed.

Drawings

Fig. 1 is a schematic structural view of a traveling motor reducer for an excavator according to the present invention;

fig. 2 is a schematic structural view of the primary planetary reduction mechanism.

Fig. 3 is a schematic structural view of the two-stage planetary reduction mechanism.

Fig. 4 is a schematic structural view of the lock nut.

Detailed Description

In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

Examples

The utility model relates to a traveling motor reducer for an excavator, which comprises an inner gear ring 5, wherein the inner gear ring 5 is provided with an inner cavity, a planetary reducing mechanism is arranged in the inner cavity, the planetary reducing mechanism comprises a primary sun gear 18, a secondary sun gear 16, a primary planetary reducing mechanism 11 and a secondary planetary reducing mechanism 8, a transmission shaft 22 of a motor is connected with a spline of the primary sun gear 18, the primary planetary reducing mechanism 11 is respectively externally engaged with the primary sun gear 18 through a primary planetary gear 11-1, is internally engaged with the inner gear ring 5, the secondary sun gear 16 is in spline connection with a primary planet carrier 11-5 of the primary planet reducing mechanism 11, the secondary planet reducing mechanism 8 is externally engaged with the secondary sun gear 16 through a secondary planet gear 8-1 respectively, the secondary baffle 9 of the secondary planetary reduction mechanism 8 is connected with a motor base 20 through a second bolt 10; a floating seal matching ring 2 is arranged in the end face of one side, connected with the motor seat 20, of the inner gear ring 5, an O-shaped sealing ring 3 is arranged between the floating seal matching ring 2 and the inner gear ring 5, the floating seal matching ring 2 is provided with an inner cavity, a groove 21 matched with the floating oil seal 1 is arranged in the end face of one side, connected with the inner gear ring 5, of the motor seat 20, and the inner cavity of the floating seal matching ring 2 is connected with the inner cavity of the groove 21 of the motor seat through the floating oil; two angular contact bearings 4 are arranged in the inner gear ring 5, one angular contact bearing 4 is connected with the motor seat 20, and the other angular contact bearing 4 is connected with the locking nut 6; the other end of the inner gear ring 5 is fixedly connected with an end cover 13 through a screw 12; a cylinder is arranged in the middle of the end cover 13, a groove is formed in the center of the cylinder, a buffer piece 19 is arranged in the groove in the end cover 13, and a buffer ring 17 is sleeved on the cylinder in the end cover 13; the primary planet speed reducing mechanism 11 is provided with a planet carrier 11-5, a primary planet carrier cylindrical boss 11-4 is arranged on the planet carrier 11-5, a second steel ring 11-2 is arranged on the primary planet carrier cylindrical boss 11-4, a second needle bearing 11-3 is connected with the second steel ring 11-2, and a primary planet gear 11-1 is connected with the second needle bearing 11-3; the end face of the first-stage planet carrier cylindrical boss 11-4 is fixed with the first-stage baffle 14 through a first bolt 15; the secondary planetary reduction mechanism 8 is provided with a secondary planetary gear 8-1, the secondary planetary gear 8-1 is connected with a first needle bearing 8-2, and the first needle bearing 8-2 is connected with a cylindrical boss 8-4 of the motor seat through a first steel ring 8-3; the end surface of the cylindrical boss 8-4 of the motor seat is fixed with a second-stage baffle 9 through a second bolt 10.

As shown in figure 4, the inner wall of the locking nut 6 is provided with a semicircular groove hole 6-3, a plug 6-2 and a pin hole 6-1, part of the motor seat 20 is sunk into the semicircular groove hole 6-3 for limiting, the plug 6-2 is inserted into the hole at the joint of the motor seat 20 and the locking nut 6 for further limiting, and finally, a pin shaft is inserted into the pin hole 6-1 to connect and fix the locking nut 6 and the motor seat 20.

When the traveling motor speed reducer for the excavator works, the transmission shaft 22 of the hydraulic motor rotates and is transmitted to the primary sun gear 18 through spline connection, the primary planet gear 11-1 of the primary planet speed reducer 11 is externally engaged with the primary sun gear 18 for transmission, and then is engaged with the inner gear ring 5 to drive the inner gear ring 5 to rotate, so that the primary speed reduction of the traveling motor speed reducer is realized; one-level planetary reduction gear 11 rotates, conveys second grade sun gear 16 through the spline hookup of one-level planet carrier 11-5, and second grade planetary gear 8-1 and the 16 external gearing transmission of second grade sun gear of second grade planetary reduction gear 8 drive ring gear 5 and rotate through the internal gearing with ring gear 5 again, realize the utility model discloses the second grade speed reduction of walking motor speed reducer.

The utility model discloses a first-level planet reduction gears 11, second grade planet reduction gears 8 all adopt cylinder boss formula planet carrier structure, planetary gear and bearing cooperation are connected, bearing passes through the steel ring and is connected with first-level planet carrier cylinder boss 11-4, motor seat cylinder boss 8-4 cooperation, and through baffle bolt fixed knot structure, cancelled the commonly used elastic pin fixed baffle structure of planet reduction gears, prevented effectively that the elastic pin, baffle, bearing from damaging because of the axial float, this planet reduction gears not only easily installs the operation, guaranteed structural performance firm stable again; the buffer ring 17 and the buffer piece 19 between the primary planetary reduction mechanism 11 and the end cover 13 play a buffer role, and axial movement and axial impact of the planetary reduction mechanism are effectively reduced.

The utility model discloses a walking motor speed reducer's two angular contact bearing 4 are installed back to back, through 6 adjustment axial clearances of steel locking nut, evenly are equipped with the semicircular slot hole on the cylinder in the steel locking nut 6, and through 4 plug 7 embedded locking fixed, cancelled and adjusted the structure that bearing axial clearance was used always with foundry goods locking nut, improved locking nut's intensity, prevented effectively that locking nut is not hard up to lead to the bearing capacity to reduce until damaging, the utility model discloses the structure is more compact with, and the part is simple not only easily processing, installation operation, has guaranteed the firm stability of structural performance again.

Claims

1. A traveling motor speed reducer for an excavator is characterized by comprising an inner gear ring (5), wherein two sides of the inner gear ring (5) are respectively connected with a motor base (20) and an end cover (13), a planetary speed reducing mechanism is arranged in the inner gear ring (5) and comprises a primary planetary speed reducing mechanism (11) and a secondary planetary speed reducing mechanism (8), the primary planetary speed reducing mechanism (11) is respectively meshed with a primary sun gear (18) and the inner gear ring (5) through a primary planetary gear (11-1), one end of the primary sun gear (18) is connected with a transmission shaft (22) of a motor, and the other end of the primary sun gear (18) is connected with the end cover (13); the secondary planetary reduction mechanism (8) is respectively meshed with the secondary sun gear (16) and the inner gear ring (5) through a secondary planetary gear (8-1), the secondary planetary reduction mechanism (8) is connected with a cylindrical boss (8-4) of the motor seat, a floating seal matching ring (2) is arranged in the end face of one side, connected with the motor seat (20), of the inner gear ring (5), a floating oil seal (1) is arranged in the floating seal matching ring (2), and a groove (21) matched with the floating oil seal (1) is arranged in the end face of one side, connected with the inner gear ring (5), of the motor seat (20); two angular contact bearings (4) are arranged in the inner gear ring (5), one angular contact bearing (4) is connected with the motor seat (20), the other angular contact bearing (4) is used for being connected with a locking nut (6), and the locking nut (6) is fixedly connected with the motor seat (20) through threads.

2. The traveling motor reducer for excavators according to claim 1, wherein the primary planetary reduction mechanism (11) comprises a planetary carrier (11-5), a primary planetary carrier cylindrical boss (11-4) is provided on the planetary carrier (11-5), a second steel ring (11-2) is provided on the primary planetary carrier cylindrical boss (11-4), a second needle bearing (11-3) is connected to the second steel ring (11-2), and a primary planetary gear (11-1) is connected to the second needle bearing (11-3); the end face of the cylindrical boss (11-4) of the primary planet carrier is fixedly connected with the primary baffle (14) through a first bolt (15).

3. The travel motor reducer for excavators according to claim 2, characterized in that the secondary sun gear (16) is spline-connected to the carrier (11-5) of the primary planetary reduction mechanism (11).

4. The traveling motor reducer for excavators according to claim 1, characterized in that the secondary planetary reduction mechanism (8) comprises a secondary planetary gear (8-1), the secondary planetary gear (8-1) is connected to a first needle bearing (8-2), and the first needle bearing (8-2) is connected to the motor base cylindrical boss (8-4) through a first steel ring (8-3); the end face of the cylindrical boss (8-4) of the motor seat is fixedly connected with the second-stage baffle (9) through a second bolt (10).

5. The travel motor reducer for excavators according to claim 1, wherein the lock nut (6) is uniformly provided with a semicircular groove hole for fitting the plug (7).

6. The travel motor reducer for excavators according to claim 1, characterized in that a cushion ring (17) is provided between the end cover (13) and the planetary reduction mechanism.

7. The traveling motor reducer for excavators according to claim 1, wherein a cushion member (19) is provided between one end of the primary sun gear (18) and the end cap (13), and a groove that fits the cushion member (19) is provided inside the end cap (13).

8. The traveling motor reducer for excavators according to claim 1, characterized in that a seal ring (3) is provided between the floating seal ring (2) and the ring gear (5).