A drive axle assembly structure of electric engineering machinery

Abstract

This invention relates to the field of drive axle assembly technology, and in particular provides a drive axle assembly structure for electric construction machinery. The drive axle assembly structure for this electric construction machinery includes a four-quadrant hydraulic drive motor, wheel-side reducers, caliper disc brakes, axle housing assembly, and a main reducer. This invention outputs high-speed driving power through the four-quadrant hydraulic drive motor, which is then reduced in speed by two stages of planetary gears in the main reducer and further reduced in speed by the wheel-side reducers before being transmitted to the wheels. The caliper disc brakes can output braking force during emergency braking, ensuring the safety of the electric construction machinery during operation. Simultaneously, during vehicle braking, braking energy can be recovered and reused by transmitting braking energy from the wheels back to the four-quadrant hydraulic drive motor through the caliper disc brakes and the main reducer. This improves the transmission efficiency of the electric construction machinery and leverages the advantages of the four-quadrant hydraulic drive motor, such as its excellent speed regulation characteristics and wide efficiency range.

Description

Technical Field

[0001] The invention relates to the technical field of drive axle assemblies, and in particular provides a drive axle assembly structure of an electric engineering machinery. Background Art

[0002] High-end equipment manufacturing is an important cornerstone of industrial modernization and an important field of scientific and technological innovation. As one of the first 15 national advanced manufacturing cluster industries released by the Ministry of Industry and Information Technology, construction machinery is also one of the most important high-end equipment manufacturing industries. It is expected to take the lead in building a world-class advanced manufacturing cluster with international competitiveness and influence. As the domestic "three-electric" technology matures, electrification has become one of the important directions for the green development of high-end construction machinery equipment.

[0003] At present, major OEMs at home and abroad have successively launched electrified models. However, the electrification of construction machinery is still in its infancy, and there are generally problems such as short battery life, heavy weight and high cost. Improving energy utilization, reducing battery capacity, and extending battery life have become major technical issues in the electrification of construction machinery. At present, the existing electric wheeled construction machinery adopts centralized drive, which makes it difficult to reasonably distribute the output torque of the front and rear axles, and is prone to generate large parasitic power. Parasitic power will aggravate tire wear, cause additional energy consumption of the vehicle, and cause additional forces on the chassis transmission system, resulting in a decrease in the life of the transmission system structural parts. However, there is no suitable drive axle solution configuration for the distributed drive configuration. Summary of the invention

[0004] Based on this, it is necessary to provide a drive axle assembly structure of an electric engineering machinery to solve at least one technical problem in the background technology.

[0005] A drive axle assembly structure of an electric engineering machinery includes a four-quadrant hydraulic drive motor, a wheel-side reducer, a caliper disc brake, a bridge housing assembly and a main reducer. The bridge housing assembly is installed on one side of the four-quadrant hydraulic drive motor. The interior of the bridge housing assembly is hollow to form a hollow cavity. The wheel-side reducer, the caliper disc brake, the bridge housing assembly and the main reducer are all arranged in the hollow cavity. The main reducer includes an input shaft, a low-speed planetary gear set, a high-speed planetary gear set and a connecting input component. One end of the input shaft is connected to the output end of the four-quadrant hydraulic drive motor through a spline. The low-speed planetary gear set and the high-speed planetary gear set are installed on one side of the hollow cavity adjacent to the output end of the four-quadrant hydraulic drive motor along the length direction, and the high-speed planetary gear set is connected to the other end of the input shaft, the low-speed planetary gear set is connected to one end of the connecting input component, and the other end of the connecting input component is connected to the input end of the wheel-side reducer. Then, the main reducer is used to reduce the power output by the four-quadrant hydraulic drive motor in two stages and transmit it to the wheel-side reducer.

[0006] As a further improvement of the present invention, the connecting input assembly includes an input shaft, an input cylinder, a connecting cylinder and a connecting element. One end of the input shaft is connected to the output end of the low-speed planetary gear set through a spline. The outer side of the input cylinder is connected to the other end of the input shaft. The inner side of the input cylinder is recessed with an installation cavity. The outer side of the connecting cylinder is installed on the outer side of the input cylinder. The inner side of the connecting cylinder is recessed with a sliding rotation hole. The connecting element is installed in the installation cavity, and the input end of the wheel-side reducer is connected to the connecting element through the sliding rotation hole.

[0007] As a further improvement of the present invention, a plurality of arc-shaped grooves are recessed on the inner wall of the installation cavity along the circumferential direction, the length direction of the arc-shaped grooves is the same as the length direction of the installation cavity, and the depth of the arc-shaped grooves gradually decreases from the outside to the inside, and an installation annular groove is recessed on the inner side of the inner wall of the installation cavity, and a limiting ring is arranged in the installation annular groove.

[0008] As a further improvement of the present invention, the connecting element includes a connecting mounting ring, an elastic mounting cylinder, a connecting spherical cylinder and a plurality of balls. The inner wall of the connecting mounting ring is installed in the input end of the wheel-side reducer, the inner wall of the elastic mounting cylinder is installed on the outer wall of the connecting mounting ring, the outer wall of the elastic mounting cylinder is recessed with a plurality of ball mounting grooves along the circumferential direction, the plurality of ball mounting grooves are respectively arranged opposite to the plurality of arc-shaped sliding grooves, the connecting spherical cylinder is installed on the outer wall of the elastic mounting cylinder, the outer wall of the connecting spherical cylinder is recessed with a plurality of ball mounting holes, the plurality of ball mounting holes are respectively arranged opposite to the plurality of ball mounting grooves, the plurality of balls are respectively installed in the plurality of ball mounting holes, and the outer edges of the balls are arranged in the ball mounting grooves.

[0009] As a further improvement of the present invention, the caliper disc brake includes a brake disc and a brake caliper body assembly, the brake disc is connected to the input end of the wheel side reducer, and the brake caliper body assembly is installed on the outer wall of the bridge housing assembly.

[0010] As a further improvement of the present invention, the brake caliper body assembly includes a mounting caliper body, a brake caliper, two caliper mounting elements, two brake pads and a driving element. The bottom inner side of the mounting caliper body is mounted on the outer wall of the bridge housing assembly, buffer columns are respectively provided at both ends of the top inner side of the mounting caliper body, and two brake pad mounting grooves are respectively recessed on both sides of the top of the mounting caliper body. Mounting blocks are respectively provided at both ends of the brake caliper, and the two mounting blocks are respectively connected to the outer ends of the two buffer columns. A sliding cavity is recessed on the inner side of the brake caliper, and the two caliper mounting elements are respectively clamped and installed in the two brake pad mounting grooves. The two brake pads are respectively installed in the two caliper mounting elements, and each brake pad is recessed in the top and bottom middle portions thereof. The driving element is installed in the sliding cavity.

[0011] As a further improvement of the present invention, a brake fluid inlet hole is recessed on the outer side of the sliding cavity, a brake fluid outlet hole is recessed on the outer side of the outer wall of the sliding cavity, a brake fluid outlet pipe is protruding from the brake fluid outlet hole, a preset slide groove is recessed on the inner wall of the sliding cavity, an annular mounting groove is recessed in the middle of the preset slide groove, and a preset groove is recessed on the inner side of the preset slide groove.

[0012] As a further improvement of the present invention, the driving element includes a brake push column and an elastic mounting ring. The brake push column is slidably installed in the sliding cavity. A triangular ring block is convexly provided on the inner side of the outer wall of the brake push column. The elastic mounting ring is installed in the ring mounting groove.

[0013] As a further improvement of the present invention, the elastic mounting ring includes an elastic mounting portion, an arc-shaped extension portion and a connecting annular portion, the elastic mounting portion is installed in the annular mounting groove, the inner wall of the elastic mounting portion is recessed with an inclined surface, one side of the arc-shaped extension portion is connected to the elastic mounting portion, and the arc-shaped extension portion is located in a preset groove, the connecting annular portion is connected to the other side of the arc-shaped extension portion, and the inner wall of the connecting annular portion is connected to the inner side of the outer wall of the brake push column, and the outer edge of the outer side of the connecting annular portion is abutted against the inner wall of the brake caliper.

[0014] As a further improvement of the present invention, each caliper mounting element includes two lateral clamps and a main clamp. The two lateral clamps are respectively clamped and installed at the two ends of the brake pad mounting groove. The two ends of the brake pad are respectively slidably installed in the two lateral clamps. The main clamps of the two caliper mounting elements are respectively clamped and installed on the side of the brake caliper away from the sliding cavity or the inner side of the brake push column. The middle part of the top and bottom surfaces of the inner side of the main clamps are respectively convexly provided with mounting buckles, and the two mounting buckles are respectively clamped and installed in the two main clamping grooves.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The four-quadrant hydraulic drive motor outputs high-speed driving power, and is decelerated by two-stage planetary gears of the low-speed planetary gear set and the high-speed planetary gear set of the main reducer, and then decelerated and transmitted to the wheels through the wheel reducer. The caliper disc brake can output braking force during emergency braking to ensure the safety of the electric engineering machinery during driving. At the same time, when the vehicle brakes, the braking energy can be transferred from the wheel to the four-quadrant hydraulic drive motor through the caliper disc brake and the main reducer for energy recovery. The effect of improving the transmission efficiency of the electric engineering machinery is achieved, and at the same time, the advantages of the good speed regulation characteristics and high-efficiency zone width of the four-quadrant hydraulic drive motor hydraulic drive are brought into play, so as to construct a drive axle assembly with a smaller volume, reasonable speed ratio distribution and stronger load-bearing capacity. At the same time, the wheel reducer, caliper disc brake and main reducer are all connected through a mechanical gear structure, with a large reduction ratio, a short transmission chain, and a more efficient and reliable transmission efficiency.

[0017] 2. When the input end of the wheel-side reducer is subjected to vibration and impact or temperature accumulation due to long-term use causes thermal expansion and contraction, resulting in a change in the length of the input end, the present invention can ensure that the driving force can be transmitted stably, avoiding transmission interruption or efficiency reduction caused by the change in the length of the input end, and ensuring the normal operation of the system in different working environments.

[0018] 3. The present invention can effectively prevent excessive movement of the brake push column and can effectively reduce the instability caused by vibration during braking, ensuring that the brake pad can stably maintain contact with the brake disc during braking, thereby ensuring the braking effect, improving the overall safety and reliability of the braking system, and avoiding loosening of the brake pad or a decrease in the braking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the present invention.

[0020] Figure 2 It is a three-dimensional schematic diagram of the input shaft connecting the input assembly and the wheel-side reducer in one embodiment of the present invention.

[0021] Figure 3 It is a schematic diagram of the interior of the input shaft connecting the input assembly and the wheel-side reducer in one embodiment of the present invention.

[0022] Figure 4 It is a three-dimensional schematic diagram of a caliper disc brake in one embodiment of the present invention.

[0023] Figure 5 It is a three-dimensional schematic diagram of a brake caliper body assembly in one embodiment of the present invention.

[0024] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0025] Figure 7 FIG. 1 is a schematic diagram of the interior of a brake caliper assembly according to an embodiment of the present invention.

[0026] Figure 8 for Figure 7 Enlarged view of point B in the middle.

[0027] In the figure:

[0028] 13. Four-quadrant hydraulic drive motor; 10. Wheel-side reducer; 11. Caliper disc brake; 12. Bridge housing assembly; 14. Main reducer; 19. Hollow cavity; 15. Input shaft; 16. Low-speed planetary gear set; 17. High-speed planetary gear set; 18. Input end; 20. Connecting input assembly; 21. Input shaft; 22. Input cylinder; 23. Connecting cylinder; 24. Connecting element; 25. Mounting cavity; 231. Sliding rotation hole; 251. Arc slide groove; 252. Mounting annular groove; 253. Limiting ring; 241. Connecting mounting ring; 242. Elastic mounting cylinder; 243. Connecting spherical cylinder; 244. Ball; 245. Ball mounting groove; 246. Ball mounting hole; 30. Brake disc; 40, brake caliper body assembly; 41, mounting caliper body; 42, brake caliper; 43, caliper mounting element; 44, brake pad; 45, driving element; 412, buffer column; 411, brake pad mounting groove; 421, mounting block; 422, sliding cavity; 441, main clamping groove; 423, brake fluid inlet hole; 425, brake fluid outlet pipe; 426, preset slide groove; 427, annular mounting groove; 428, preset groove; 451, brake push column; 452, elastic mounting ring; 453, triangular annular block; 454, elastic mounting part; 455, arc-shaped extension part; 456, connecting annular part; 457, inclined surface; 431, lateral clamp; 432, main clamp; 433, mounting buckle. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0030] In the description of the present invention, it should be noted that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] See also Figures 1 to 8 A drive axle assembly structure of an electric engineering machinery includes a four-quadrant hydraulic drive motor 13, a wheel-side reducer 10, a caliper disc brake 11, a bridge housing assembly 12 and a main reducer 14. The bridge housing assembly 12 is installed on one side of the four-quadrant hydraulic drive motor 13. The bridge housing assembly 12 is hollow inside to form a hollow cavity 19. The wheel-side reducer 10, the caliper disc brake 11, the bridge housing assembly 12 and the main reducer 14 are all arranged in the hollow cavity 19. The main reducer 14 includes an input shaft 15, a low-speed planetary gear set 16, a high-speed planetary gear set 17 and a connecting input component 20. One end of the input shaft 15 It is connected to the output end of the four-quadrant hydraulic drive motor 13 through a spline, and the low-speed planetary gear set 16 and the high-speed planetary gear set 17 are installed on the side of the output end of the hollow cavity 19 adjacent to the four-quadrant hydraulic drive motor 13 along the length direction, and the high-speed planetary gear set 17 is connected to the other end of the input shaft 15, and the low-speed planetary gear set 16 is connected to one end of the connecting input component 20, and the other end of the connecting input component 20 is connected to the input end 18 of the wheel-side reducer 10, and then the main reducer 14 is used to reduce the power output by the four-quadrant hydraulic drive motor 13 in two stages and transmit it to the wheel-side reducer 10.

[0033] The four-quadrant hydraulic drive motor 13 outputs high-speed driving power, and is decelerated by two-stage planetary gears of the low-speed planetary gear set 16 and the high-speed planetary gear set 17 of the main reducer 14, and then decelerated and transmitted to the wheels through the wheel reducer 10. The caliper disc brake 11 can output braking force during emergency braking to ensure the safety of the electric engineering machinery during driving. At the same time, when the vehicle brakes, the braking energy can be transferred from the wheel to the four-quadrant hydraulic drive motor 13 through the caliper disc brake 11 and the main reducer 14 for energy recovery. The effect of improving the transmission efficiency of the electric engineering machinery is achieved, and at the same time, the advantages of the good speed regulation characteristics and high-efficiency zone width of the hydraulic drive of the four-quadrant hydraulic drive motor 13 are brought into play, so as to construct a drive axle assembly with a smaller volume, reasonable speed ratio distribution and stronger load-bearing capacity. At the same time, the wheel reducer 10, the caliper disc brake 11 and the main reducer 14 are all connected through a mechanical gear structure, with a large reduction ratio, a short transmission chain, and a more efficient and reliable transmission efficiency.

[0034] The connecting input assembly 20 includes an input shaft 21, an input cylinder 22, a connecting cylinder 23 and a connecting element 24. One end of the input shaft 21 is connected to the output end of the low-speed planetary gear set 16, and the outer side of the input cylinder 22 is connected to the other end of the input shaft 21. The inner side of the input cylinder 22 is recessed with a mounting cavity 25, and the outer side of the connecting cylinder 23 is installed on the outer side of the input cylinder 22. The inner side of the connecting cylinder 23 is recessed with a sliding rotation hole 231. The connecting element 24 is installed in the mounting cavity 25, and the input end 18 of the wheel-side reducer 10 is penetrated through the sliding rotation hole 231 and connected to the connecting element 24.

[0035] The inner wall of the installation cavity 25 is recessed with a plurality of arc-shaped grooves 251 along the circumferential direction. The length direction of the arc-shaped grooves 251 is the same as the length direction of the installation cavity 25, and the depth of the arc-shaped grooves 251 gradually decreases from the outside to the inside. The inner side of the inner wall of the installation cavity 25 is recessed with an installation annular groove 252, and a limiting ring 253 is arranged in the installation annular groove 252.

[0036] The connecting element 24 includes a connecting mounting ring 241, an elastic mounting cylinder 242, a connecting spherical cylinder 243 and a plurality of balls 244. The inner wall of the connecting mounting ring 241 is installed in the input end 18 of the wheel-side reducer 10, the inner wall of the elastic mounting cylinder 242 is installed on the outer wall of the connecting mounting ring 241, and the outer wall of the elastic mounting cylinder 242 is recessed with a plurality of ball mounting grooves 245 along the circumferential direction, and the plurality of ball mounting grooves 245 are respectively arranged opposite to the plurality of arc-shaped slide grooves 251. The connecting spherical cylinder 243 is installed on the outer wall of the elastic mounting cylinder 242, and the outer wall of the connecting spherical cylinder 243 is recessed with a plurality of ball mounting holes 246, and the plurality of ball mounting holes 246 are respectively arranged opposite to the plurality of ball mounting grooves 245. The plurality of balls 244 are respectively installed in the plurality of ball mounting holes 246, and the outer edges of the balls 244 are arranged in the ball mounting grooves 245.

[0037] When the driving force reduced by two stages of planetary gears is transmitted from the low-speed planetary gear set 16, the input shaft 21 will rotate, causing the input cylinder 22 to rotate accordingly. At this time, the outer edge of the ball 244 is arranged in the ball mounting groove 245. The driving force will be transmitted to the connecting element 24 through the multiple balls 244, thereby driving the connecting element 24 to rotate synchronously, and then transmitting the driving force to the wheel-side reducer 10.

[0038] For example, in one embodiment: when the input end 18 of the wheel-side reducer 10 is subjected to vibration and impact or temperature accumulation due to long-term use causes thermal expansion and contraction, resulting in a change in the length of the input end 18, affecting its position, the outer end connecting element 24 of the input end 18 will move along the multiple arc-shaped grooves 251. At the same time, since the depth of the arc-shaped grooves 251 gradually decreases from the outside to the inside, and the inner edges of the multiple balls 244 are arranged in the multiple ball mounting grooves 245 of the elastic mounting tube 242, it is ensured that when the outer end connecting element 24 of the input end 18 moves along the multiple arc-shaped grooves 251, the outer edge of the ball 244 is always arranged in the ball mounting groove 245, so that when the length of the input end 18 changes, the driving force can be transmitted to ensure its transmission efficiency.

[0039] The caliper disc brake 11 includes a brake disc 30 and a brake caliper body assembly 40 . The brake disc 30 is connected to the input end 18 of the wheel-side reducer 10 , and the brake caliper body assembly 40 is installed on the outer wall of the bridge housing assembly 12 .

[0040] The brake caliper body assembly 40 includes a mounting caliper body 41, a brake caliper 42, two caliper mounting elements 43, two brake pads 44 and a driving element 45. The inner bottom of the mounting caliper body 41 is installed on the outer wall of the bridge housing assembly 12, and buffer columns 412 are respectively protruded at both ends of the inner top of the mounting caliper body 41. Two brake pad mounting grooves 411 are respectively recessed on both sides of the top of the mounting caliper body 41. Mounting blocks 421 are respectively protruded at both ends of the brake caliper 42. The two mounting blocks 421 are respectively connected to the outer ends of the two buffer columns 412. A sliding cavity 422 is recessed on the inner side of the brake caliper 42. The two caliper mounting elements 43 are respectively clamped and installed in the two brake pad mounting grooves 411. The two brake pads 44 are respectively installed in the two caliper mounting elements 43. A main clamping groove 441 is recessed in the middle of the top and bottom surfaces of each brake pad 44, and the driving element 45 is installed in the sliding cavity 422.

[0041] A brake fluid inlet hole 423 is recessed on the outer side of the sliding cavity 422, a brake fluid outlet hole is recessed on the outer side of the outer wall of the sliding cavity 422, a brake fluid outlet pipe 425 is convexly provided on the brake fluid outlet hole, a preset slide groove 426 is recessed on the inner wall of the sliding cavity 422, an annular mounting groove 427 is recessed in the middle of the preset slide groove 426, and a preset groove 428 is recessed on the inner side of the preset slide groove 426.

[0042] The driving element 45 includes a brake push column 451 and an elastic mounting ring 452 . The brake push column 451 is slidably mounted in the sliding cavity 422 . A triangular ring block 453 is convexly provided on the inner side of the outer wall of the brake push column 451 . The elastic mounting ring 452 is installed in the annular mounting groove 427 .

[0043] The elastic mounting ring 452 includes an elastic mounting portion 454, an arc-shaped extension portion 455 and a connecting annular portion 456. The elastic mounting portion 454 is installed in the annular mounting groove 427. The inner wall of the elastic mounting portion 454 is recessed with an inclined surface 457. One side of the arc-shaped extension portion 455 is connected to the elastic mounting portion 454, and the arc-shaped extension portion 455 is located in the preset groove 428. The connecting annular portion 456 is connected to the other side of the arc-shaped extension portion 455. The inner wall of the connecting annular portion 456 is connected to the inner side of the outer wall of the brake push column 451, and the outer edge of the outer side of the connecting annular portion 456 is abutted against the inner wall of the brake caliper 42.

[0044] Each caliper mounting element 43 includes two lateral clamps 431 and a main clamp 432. The two lateral clamps 431 are respectively clamped and installed at the two ends of the brake pad mounting groove 411. The two ends of the brake pad 44 are respectively slidably installed in the two lateral clamps 431. The main clamps 432 of the two caliper mounting elements 43 are respectively clamped and installed on the side of the brake caliper 42 away from the sliding cavity 422 or the inner side of the brake push column 451. The middle part of the top and bottom surfaces of the inner sides of the main clamps 432 are respectively convexly provided with mounting buckles 433. The two mounting buckles 433 are respectively clamped and installed in the two main slots 441.

[0045] For example, in one embodiment: when braking, the brake fluid will enter the sliding cavity 422 along the brake fluid inlet hole 423, thereby driving the brake push column 451 to move inward, thereby pushing the main clamp 432 on the inner side of the brake push column 451 to move along, so that the brake pad 44 therein moves along, until the inner side of the brake pad 44 presses against the side wall of the brake disc 30, and the brake disc 30 is braked. When the braking force still needs to be increased, the brake push column 451 will continue to move relative to the sliding cavity 422. Since the inner side of the brake pad 44 adjacent to the brake push column 451 has been pressed against the side wall of the brake disc 30 at this time, the brake caliper 42 will drive the buffer column 412 to extend, that is, the brake caliper 42 moves outward relative to the brake pad 44, so that the main clamp 432 installed on the inner side of the inner wall of the brake caliper 42 moves along, so that the brake pad 44 therein moves along, so that the inner side of another brake pad 44 presses against the side wall of the brake disc 30, thereby increasing the braking force.

[0046] When the brake push column 451 moves along the sliding cavity 422, the triangular ring block 453 will follow the movement. When the maximum braking force is reached, the outer wall of the triangular ring block 453 will abut against the inclined surface 457, thereby limiting the position of the brake push column 451. When vibration occurs during the braking process, the elastic mounting portion 454 will buffer the vibration and ensure the fit between the outer wall of the triangular ring block 453 and the inclined surface 457, thereby ensuring the stability of the position of the brake push column 451, thereby preventing the brake pad 44 from loosening and ensuring the braking effect.

[0047] Installation process: install the axle housing assembly 12 on one side of the four-quadrant hydraulic drive motor 13, the wheel-side reducer 10, the caliper disc brake 11, the axle housing assembly 12 and the main reducer 14 are all arranged in the hollow cavity 19, one end of the input shaft 15 is connected to the output end of the four-quadrant hydraulic drive motor 13 through a spline, the low-speed planetary gear set 16 and the high-speed planetary gear set 17 are installed along the length direction on one side of the hollow cavity 19 adjacent to the output end of the four-quadrant hydraulic drive motor 13, and the high-speed planetary gear set 17 is connected to the other end of the input shaft 15, one end of the input shaft body 21 is connected to the output end of the low-speed planetary gear set 16 through a spline, and the input The outer side of the cylinder 22 is connected to the other end of the input shaft 21, the outer side of the connecting cylinder 23 is installed on the inner side of the input cylinder 22, the connecting element 24 is installed in the installation cavity 25, and the input end 18 of the wheel-side reducer 10 is penetrated through the sliding rotation hole 231 and connected to the connecting element 24, the inner wall of the connecting mounting ring 241 is installed in the input end 18 of the wheel-side reducer 10, the inner wall of the elastic mounting cylinder 242 is installed on the outer wall of the connecting mounting ring 241, the connecting spherical cylinder 243 is installed on the outer wall of the elastic mounting cylinder 242, and the multiple ball mounting holes 246 are respectively arranged opposite to the multiple ball mounting grooves 245, and the multiple balls 244 are respectively installed on the multiple ball The outer edge of the ball 244 is arranged in the ball mounting groove 245, the brake disc 30 is connected to the input end 18 of the wheel-side reducer 10, the inner bottom of the mounting caliper body 41 is installed on the outer wall of the bridge housing assembly 12, the two mounting blocks 421 are respectively connected to the outer ends of the two buffer columns 412, the brake push column 451 is slidably installed in the sliding cavity 422, the inner side of the outer wall of the brake push column 451 is convexly provided with a triangular annular block 453, the elastic mounting ring 452 is installed in the annular mounting groove 427, the elastic mounting portion 454 is installed in the annular mounting groove 427, the outer side of the arc extension portion 455 is installed on the inner side of the elastic mounting portion 454, and the arc The extension portion 455 is located in the preset groove 428, the inner edge of the outer side of the connecting annular portion 456 is installed on the inner side of the arc-shaped extension portion 455, and the inner wall of the connecting annular portion 456 is connected to the inner side of the outer wall of the brake push column 451, and the outer edge of the outer side of the connecting annular portion 456 is abutted against the inner wall of the brake caliper 42, and the two lateral clamps 431 are respectively clamped and installed at the two ends of the brake pad mounting groove 411, and the two ends of the brake pad 44 are respectively slidably installed in the two lateral clamps 431, and the outer side of the main clamp 432 is clamped and installed on the inner side of the inner wall of the brake caliper 42 or the inner side of the brake push column 451, and the two mounting buckles 433 are respectively clamped and installed in the two main clamping grooves 441.

[0048] The present invention can achieve:

[0049] 1. The four-quadrant hydraulic drive motor 13 outputs high-speed driving power, and is decelerated by two-stage planetary gears of the low-speed planetary gear set 16 and the high-speed planetary gear set 17 of the main reducer 14, and then decelerated and transmitted to the wheels through the wheel reducer 10. The caliper disc brake 11 can output braking force during emergency braking to ensure the safety of the electric engineering machinery during driving. At the same time, when the vehicle brakes, the braking energy can be transferred from the wheel to the four-quadrant hydraulic drive motor 13 through the caliper disc brake 11 and the main reducer 14 for energy recovery. The effect of improving the transmission efficiency of the electric engineering machinery is achieved, and at the same time, the advantages of the good speed regulation characteristics and high-efficiency zone width of the hydraulic drive of the four-quadrant hydraulic drive motor 13 are brought into play, so as to construct a drive axle assembly with a smaller volume, reasonable speed ratio distribution and stronger load-bearing capacity. At the same time, the wheel reducer 10, the caliper disc brake 11 and the main reducer 14 are all connected through a mechanical gear structure, with a large reduction ratio, a short transmission chain, and a more efficient and reliable transmission efficiency.

[0050] 2. When the input end 18 of the wheel-side reducer 10 expands and contracts due to vibration and impact or temperature accumulation caused by long-term use, resulting in a change in the length of the input end 18, the present invention can ensure that the driving force can be transmitted stably, avoiding transmission interruption or efficiency reduction caused by the change in the length of the input end 18, and ensuring the normal operation of the system under different working environments.

[0051] 3. The present invention can effectively prevent excessive movement of the brake push column 451, and can effectively reduce the instability caused by vibration during braking, ensuring that the brake pad 44 can stably maintain contact with the brake disc 30 during braking, thereby ensuring the braking effect, improving the overall safety and reliability of the braking system, and avoiding loosening of the brake pad 44 or a decrease in the braking effect.

[0052] The above-mentioned embodiments only express several embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A drive axle assembly structure of an electric engineering machinery, characterized in that: The invention comprises a four-quadrant hydraulic drive motor (13), a wheel-side reducer (10), a caliper disc brake (11), a bridge housing assembly (12) and a main reducer (14); the bridge housing assembly (12) is installed on one side of the four-quadrant hydraulic drive motor (13); the bridge housing assembly (12) is hollow inside to form a hollow cavity (19); the wheel-side reducer (10), the caliper disc brake (11), the bridge housing assembly (12) and the main reducer (14) are all arranged in the hollow cavity (19); the main reducer (14) comprises an input shaft (15), a low-speed planetary gear set (16), a high-speed planetary gear set (17) and a connecting input component (20); one end of the input shaft (15) is connected to the four-quadrant The output end of the hydraulic drive motor (13) is connected via a spline, and a low-speed planetary gear set (16) and a high-speed planetary gear set (17) are installed on one side of the hollow cavity (19) adjacent to the output end of the four-quadrant hydraulic drive motor (13) along the length direction, and the high-speed planetary gear set (17) is connected to the other end of the input shaft (15), and the low-speed planetary gear set (16) is connected to one end of the connecting input component (20), and the other end of the connecting input component (20) is connected to the input end (18) of the wheel-side reducer (10), and then the power output by the four-quadrant hydraulic drive motor (13) is reduced in two stages by using the main reducer (14) and transmitted to the wheel-side reducer (10); The connecting input assembly (20) comprises an input shaft (21), an input cylinder (22), a connecting cylinder (23) and a connecting element (24); one end of the input shaft (21) is connected to the output end of the low-speed planetary gear set (16) via a spline; the outer side of the input cylinder (22) is connected to the other end of the input shaft (21); a mounting cavity (25) is recessed on the inner side of the input cylinder (22); the outer side of the connecting cylinder (23) is mounted on the outer side of the input cylinder (22); a sliding rotation hole (231) is recessed on the inner side of the connecting cylinder (23); the connecting element (24) is mounted in the mounting cavity (25); and the input end (18) of the wheel-side reducer (10) is connected to the connecting element (24) through the sliding rotation hole (231); The inner wall of the installation cavity (25) is provided with a plurality of arc-shaped sliding grooves (251) along the circumferential direction, the length direction of the arc-shaped sliding grooves (251) is the same as the length direction of the installation cavity (25), and the depth of the arc-shaped sliding grooves (251) gradually decreases from the outside to the inside, and the inner side of the inner wall of the installation cavity (25) is provided with an installation annular groove (252), and a limit ring (253) is provided in the installation annular groove (252); The connecting element (24) comprises a connecting mounting ring (241), an elastic mounting cylinder (242), a connecting spherical cylinder (243) and a plurality of balls (244); the inner wall of the connecting mounting ring (241) is mounted in the input end (18) of the wheel-side reducer (10); the inner wall of the elastic mounting cylinder (242) is mounted on the outer wall of the connecting mounting ring (241); the outer wall of the elastic mounting cylinder (242) is concavely provided with a plurality of ball mounting grooves (245) along the circumferential direction; the plurality of ball mounting grooves (245) are ) are respectively arranged opposite to the plurality of arc-shaped slide grooves (251), the connecting spherical cylinder (243) is installed on the outer wall of the elastic installation cylinder (242), the outer wall of the connecting spherical cylinder (243) is concavely provided with a plurality of ball installation holes (246), the plurality of ball installation holes (246) are respectively arranged opposite to the plurality of ball installation grooves (245), the plurality of balls (244) are respectively installed in the plurality of ball installation holes (246), and the outer edges of the balls (244) are arranged in the ball installation grooves (245); The caliper disc brake (11) comprises a brake disc (30) and a brake caliper body assembly (40), the brake disc (30) is connected to an input end (18) of a wheel-side reducer (10), and the brake caliper body assembly (40) is mounted on an outer wall of a bridge housing assembly (12); The brake caliper assembly (40) comprises a mounting caliper body (41), a brake caliper (42), two caliper mounting elements (43), two brake pads (44) and a driving element (45). The inner bottom of the mounting caliper body (41) is mounted on the outer wall of the bridge housing assembly (12). Buffer columns (412) are respectively provided at both ends of the inner top of the mounting caliper body (41). Two brake pad mounting grooves (411) are respectively provided at both sides of the top of the mounting caliper body (41). Mounting blocks (412) are respectively provided at both ends of the brake caliper body (42). 21), two mounting blocks (421) are respectively connected to the outer ends of the two buffer columns (412), a sliding cavity (422) is recessed on the inner side of the brake caliper (42), two caliper mounting elements (43) are respectively clamped and mounted in the two brake pad mounting grooves (411), two brake pads (44) are respectively mounted in the two caliper mounting elements (43), a main clamping groove (441) is recessed in the middle of the top surface and the bottom surface of each brake pad (44), and the driving element (45) is installed in the sliding cavity (422); A brake fluid inlet hole (423) is recessed on the outer side of the sliding cavity (422), a brake fluid outlet hole is recessed on the outer side of the outer wall of the sliding cavity (422), a brake fluid outlet pipe (425) is protruding from the brake fluid outlet hole, a preset slide groove (426) is recessed on the inner wall of the sliding cavity (422), an annular mounting groove (427) is recessed in the middle of the preset slide groove (426), and a preset groove (428) is recessed on the inner side of the preset slide groove (426); The driving element (45) comprises a brake push column (451) and an elastic mounting ring (452), the brake push column (451) is slidably mounted in the sliding cavity (422), a triangular ring block (453) is convexly provided on the inner side of the outer wall of the brake push column (451), and the elastic mounting ring (452) is mounted in the annular mounting groove (427); The elastic mounting ring (452) comprises an elastic mounting portion (454), an arc-shaped extension portion (455) and a connecting annular portion (456); the elastic mounting portion (454) is mounted in the annular mounting groove (427); an inclined surface (457) is recessed on the inner wall of the elastic mounting portion (454); one side of the arc-shaped extension portion (455) is connected to the elastic mounting portion (454), and the arc-shaped extension portion (455) is located in the preset groove (428); the connecting annular portion (456) is connected to the other side of the arc-shaped extension portion (455); the inner wall of the connecting annular portion (456) is connected to the inner side of the outer wall of the brake push column (451); and the outer edge of the outer side of the connecting annular portion (456) is abutted against the inner wall of the brake caliper (42).

2. The drive axle assembly structure of the electric engineering machinery according to claim 1 is characterized in that: Each caliper mounting element (43) comprises two lateral clamps (431) and a main clamp (432); the two lateral clamps (431) are respectively clamped and mounted at the two ends of the brake pad mounting groove (411); the two ends of the brake pad (44) are respectively slidably mounted in the two lateral clamps (431); the main clamps (432) of the two caliper mounting elements (43) are respectively clamped and mounted on the side of the brake caliper (42) away from the sliding cavity (422) or the inner side of the brake push column (451); the middle of the inner top surface and the bottom surface of the main clamp (432) are respectively convexly provided with mounting buckles (433); the two mounting buckles (433) are respectively clamped and mounted in the two main clamp grooves (441).

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