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CN-121973622-A - Novel loader motor drive axle

CN121973622ACN 121973622 ACN121973622 ACN 121973622ACN-121973622-A

Abstract

The application relates to a novel electromechanical drive axle, which comprises an axle housing, two half shafts, a differential assembly, a limited slip assembly and a motor. The differential assembly is used for realizing differential transmission of the two half shafts, and comprises a wheel disc, a retainer, a first planetary gear, a second planetary gear and two half shaft gears, wherein the slip limiting assembly comprises a friction cylinder, a mandrel, a friction piece and a first elastic piece, the friction cylinder is fixedly connected to the end face of the first planetary gear, the mandrel is fixedly connected to the end face of the second planetary gear, the friction piece is slidably arranged in a chute formed in the mandrel, the first elastic piece is used for enabling the friction piece to move to the depth of the chute, when the rotating speed of the mandrel reaches a preset value, the friction piece moves outwards of the chute under the action of centrifugal force and abuts against the inner wall of the friction cylinder, and the motor drives the wheel disc to rotate. The application has the effects of reducing the impact and vibration generated during the differential locking of the driving axle, improving the running stability and prolonging the service life of the driving axle.

Inventors

  • LI DEJIANG
  • HAN CHUANHONG

Assignees

  • 烟台桥安传动有限公司

Dates

Publication Date
20260505
Application Date
20260207

Claims (10)

  1. 1. A novel loader transaxle, comprising: An axle housing (1); one end of each half shaft (2) is rotationally connected with the axle housing (1) and extends to the inner cavity of the axle housing (1), and the other end of each half shaft penetrates out of the axle housing (1) and is connected with a hub; The differential assembly (3) is arranged in the axle housing (1), the differential assembly (3) comprises a wheel disc (31), a retainer (32), a first planetary gear (33), a second planetary gear (34) and two side gears (35), the wheel disc (31) is rotatably arranged on the axle housing (1) and is coaxial with the half shafts (2), the retainer (32) is fixedly connected to the wheel disc (31), the first planetary gear (33) and the second planetary gear (34) are coaxially and rotatably arranged on the retainer (32), the rotation axis of the first planetary gear (33) is perpendicular to the rotation axis of the wheel disc (31), the first planetary gear (33) and the second planetary gear (34) are circumferentially and symmetrically distributed by taking the rotation axis of the wheel disc (31) as a central axis, the two side gears (35) are respectively arranged at two ends of the two half shafts (2) in the axle housing (1), and each side gear (35) is meshed with the first planetary gear (33) and the second planetary gear (34); The friction limiting assembly (4) is arranged between the first planetary gear (33) and the second planetary gear (34), the friction limiting assembly (4) comprises a friction cylinder (41), a mandrel (42), a friction piece (43) and a first elastic piece (44), wherein the friction cylinder (41) is coaxial with the first planetary gear (33) and one end of the friction piece is fixedly connected to the end face of the first planetary gear (33), the other end of the friction piece extends towards the direction close to the second planetary gear (34), the mandrel (42) is coaxially fixedly connected to the end face of the second planetary gear (34) and one end of the mandrel is inserted into the friction cylinder (41), a sliding groove (421) is formed in the circumferential surface of the mandrel (42), the friction piece (43) is slidably arranged in the sliding groove (421), and the mandrel (42) rotates to drive the friction piece (43) to rotate together, and the first elastic piece (44) is used for enabling the friction piece (43) to move deep into the sliding groove (421), and when the rotating speed of the mandrel (42) reaches a preset value, the friction piece (43) moves downwards and abuts against the inner wall (41) under the action of the sliding groove (421); And the motor (5) is used for driving the wheel disc (31) to rotate.
  2. 2. The novel loader motor drive axle according to claim 1, wherein one end of the friction cylinder (41) far away from the first planetary gear (33) is in sealing abutting connection with the end face of the second planetary gear (34) so as to form a sealed cavity (411) in the friction cylinder (41), the friction piece (43) is in sealing sliding connection with the inner wall of the sliding groove (421) so as to form a sealed air cavity (4211) between the bottom surface of the sliding groove (421) and the friction piece (43), an air inlet channel (422) and an air outlet channel (423) which are communicated with the sealed cavity (411) and the air cavity (4211) are formed in the core shaft (42), a one-way valve (7) used for preventing air in the air cavity (4211) from being discharged into the sealed cavity (411) through the air inlet channel (422) is arranged in the air inlet channel (422), and a pressure release valve (8) is arranged in the air outlet channel (423).
  3. 3. The novel loader motor drive axle according to claim 2, further comprising a mechanical seal (6) assembly, wherein the mechanical seal (6) assembly comprises a stationary ring (61), a movable ring (62) and a second elastic piece (63), the stationary ring (61) is fixedly connected to the inner wall of the friction cylinder (41), the outer annular wall of the stationary ring (61) is in sealing abutting joint with the inner wall of the friction cylinder (41), the movable ring (62) is hermetically sleeved on the mandrel (42) in a sliding manner, one end, close to the first planetary gear (33), of the movable ring (62) is in sealing sliding abutting joint with one end, close to the second planetary gear (34), of the stationary ring (61), and the second elastic piece (63) is used for enabling the movable ring (62) to generate a trend of approaching the first planetary gear (33).
  4. 4. The novel loader motor drive axle of claim 2, wherein the friction piece (43) comprises a piston block (431) and a friction block (432), one end of the piston block (431) is inserted into the sliding groove (421) and is in sealing sliding connection with the inner wall of the sliding groove (421), and the other end of the piston block is detachably connected with the friction block (432).
  5. 5. A novel loader motor drive axle according to claim 2, wherein a sealing ring (9) is arranged on the abutting surface of the friction cylinder (41) and the second planetary gear (34).
  6. 6. A novel loader motor drive axle according to claim 1, characterized in that the sliding direction of the friction member (43) is perpendicular to the rotational axis of the spindle (42), and that the center of mass of the friction member (43) is located on the rotational axis of the wheel disc (31).
  7. 7. A novel loader motor drive axle according to claim 1, wherein the first elastic member (44) is capable of releasing the friction member (43) from abutment with the inner wall of the friction cylinder (41) when the rotational speed of the spindle (42) is below a preset value.
  8. 8. The novel loader motor drive axle according to claim 1, wherein a first spiral bevel gear (311) is coaxially arranged on the wheel disc (31), and a second spiral bevel gear (51) meshed with the first spiral bevel gear (311) is arranged on an output shaft of the motor (5).
  9. 9. A novel loader motor drive axle according to claim 1, wherein the axle housing (1) comprises a first housing (11) and a second housing (12) which are sealingly connected by means of a plurality of bolts.
  10. 10. The novel loader motor drive axle according to claim 1, wherein the axle housing (1) is provided with a lubrication medium filling port (111) and a lubrication medium discharging port (112).

Description

Novel loader motor drive axle Technical Field The application relates to the technical field of drive axles, in particular to a novel loader motor drive axle. Background The loader is used as a core engineering machine, and the performance of a power transmission system of the loader is important. In recent years, the electric drive axle is widely applied to the design of a novel loader due to the advantages of high transmission efficiency, quick response, flexible control and the like. The electric drive axle integrates key components such as a driving motor, a speed reducing mechanism, a differential mechanism, a half shaft and the like, and is responsible for efficiently and reliably transmitting power to the driving wheel so as to meet the traction and trafficability requirements of the loader under complex and heavy-load working conditions. In the actual operation process of the loader, the phenomenon of skidding of the single-side driving wheel often occurs when the loader is in a muddy state, loose sand or rugged and uneven road surface. At this time, the open differential employed in the conventional electric drive axle distributes most of the power to the low-adhesion slipping wheels, resulting in insufficient torque for the high-adhesion wheels, significant drop in the overall driving force, and even loss of the ability to slip in severe cases. To solve this problem, existing electric drive axles generally integrate a differential locking mechanism (e.g., a dog or clutch differential lock). The core function of the mechanism is to force the locking differential to rigidly connect the two half shafts when a significant wheel speed difference (i.e., one-sided slip) is detected, thereby ensuring that torque can be effectively transferred to the wheels with adhesion. However, the differential locking technology employed by existing electric drive axles has the significant disadvantage that the locking action is typically driven by a solenoid valve or actuator, and the rigid coupling is accomplished instantaneously after triggering. Although this instantaneous locking mode effectively prevents power loss, it inevitably brings about severe mechanical impact to the whole drive axle transmission chain (including differential gears, half shafts, even reduction gears and drive motor output shafts). The impact is particularly serious under the working condition of a loading machine with heavy load, low speed and large torque output, and the long-term action is easy to cause the reliability problems of gear tooth breakage, early damage of bearings, loosening of connecting pieces and the like, so that the service life of the drive axle is shortened. Meanwhile, sudden change of the wheel torque caused by instant locking can also cause unexpected posture change (such as slight deviation or shaking) of the vehicle at the instant of locking, so that the control stability and the driver experience are affected. Disclosure of Invention In order to reduce the impact and vibration generated during the differential locking of the driving axle and improve the running stability and service life of the driving axle, the application provides a novel loader electric driving axle. The novel loader motor drive axle provided by the application adopts the following technical scheme: a novel loader transaxle comprising: A bridge housing; One end of the half shaft is rotatably connected with the axle housing and extends to the inner cavity of the axle housing, and the other end of the half shaft penetrates out of the axle housing and is connected with a hub; The differential assembly is arranged in the axle housing and comprises a wheel disc, a retainer, a first planetary gear, a second planetary gear and two half-shaft gears; the wheel disc is arranged on the axle housing in a rotating way and is coaxial with the half axle, the retainer is fixedly connected to the wheel disc, the first planetary gears and the second planetary gears are coaxially and respectively arranged on the retainer in a rotating way, the rotating axes of the first planetary gears are perpendicular to the rotating axes of the wheel disc, and the first planetary gears and the second planetary gears are symmetrically distributed in a circumference way by taking the rotating axes of the wheel disc as central axes; The sliding limiting assembly is arranged between the first planetary gear and the second planetary gear and comprises a friction cylinder, a mandrel, a friction piece and a first elastic piece; the friction cylinder is coaxial with the first planetary gear, one end of the friction cylinder is fixedly connected to the end face of the first planetary gear, and the other end of the friction cylinder extends towards the direction close to the second planetary gear; the mandrel is coaxially and fixedly connected to the end face of the second planetary gear, one end of the mandrel is inserted into the friction cylinder, and a sliding groove is formed in th