A switchable dual-motor reduction gear drive system

Abstract

The utility model relates to the technical field of speed reducer drive system provides a kind of switchable double motor's speed reducer drive system, including double motor input unit, power switching unit, transmission unit and brake unit. Double motor input unit contains two independent input gear shafts, power switching unit controls the meshing state of input gear and intermediate gear by the axial displacement of height adjustment shaft and bolt shaft locking, transmission unit realizes power transmission by spline connection, brake unit locks or releases transmission shaft by piston compression or separates friction plate group. The system is immediately switched standby motor when single motor failure by double motor redundancy design, eliminates shutdown risk, and switching operation is simple and reliable, can greatly shorten fault recovery time, reduce energy loss simultaneously, improve transmission efficiency and stability, also can prevent power out of control in switching process, ensure continuous operation of equipment.

Description

Technical Field

[0001] This utility model relates to the technical field of speed reducer transmission systems, specifically to a speed reducer transmission system with switchable dual motors. Background Technology

[0002] A speed reducer transmission system is a widely used power transmission device in industrial machinery. It converts the high-speed, low-torque input motor into a low-speed, high-torque output by reducing its speed, adapting to the load requirements of different equipment. This system typically includes an input unit, a transmission unit, a reduction unit, and an output unit. Through the speed reduction of the reducer, it achieves outputs with different torques and speeds, meeting the needs of low-speed, high-torque operation under various working conditions. It is widely used in various applications such as construction machinery, agricultural machinery, mining machinery, petroleum machinery, and marine engineering equipment.

[0003] With the increasing demand for customized functions, some applications require that the gearbox transmission system cannot fail during operation, as downtime would result in significant economic losses. Therefore, the current mainstream practice in China is to use domestically produced gearboxes and imported motors. However, motors are inherently wear-prone components, and even imported motors cannot completely prevent failures. Furthermore, existing gearbox transmission systems still rely on a single motor as the power source; when this motor fails, the entire transmission system immediately stops working, causing equipment downtime. Therefore, this solution still carries the possibility of downtime due to malfunctions. Additionally, imported motors are expensive, have long delivery cycles, and face unpredictable supply issues. Replacing a faulty motor requires disassembling and reinstalling related components, a time-consuming process that cannot meet the equipment's continuous operation requirements.

[0004] Therefore, in order to solve the above problems, the switchable dual-motor reducer transmission system provided by this utility model can not only use domestic motors, reducing procurement prices and shortening the supply cycle, but also ensures controllable supply sources, which is of great significance. Utility Model Content

[0005] To address the problems existing in the background art, this utility model provides a switchable dual-motor reducer transmission system, comprising:

[0006] The bearing housing and a first motor input unit and a second motor input unit installed inside the bearing housing; the first motor input unit includes an input gear shaft one, a first motor and a motor base one; the second motor input unit includes an input gear shaft two, a second motor and a motor base two; wherein the first motor is fixed to the motor base one and connected to the input gear shaft one; the second motor is fixed to the motor base two and connected to the input gear shaft two;

[0007] The power switching unit includes a height adjustment shaft, a height adjustment cover, a bolt shaft, a height adjustment seat, three spaced-apart bearings, three locking holes, and a sealing ring. The height adjustment shaft has a first positioning hole and a second positioning hole arranged in a front-to-back pattern. The height adjustment cover has a fixing hole. The bolt shaft selectively passes through the first positioning hole and the fixing hole, or through the second positioning hole and the fixing hole. The three spaced-apart bearings are axially fixed to the height adjustment seat through the locking holes to radially support the height adjustment shaft. The outer circle of the height adjustment shaft has a small clearance fit with the inner hole of the bearing, allowing the height adjustment shaft to be radially fixed within the height adjustment seat while being axially movable. A sealing ring is installed between the height adjustment shaft and the height adjustment cover to seal the lubricating oil in the reducer transmission system.

[0008] The transmission unit includes an intermediate gear, a drive shaft, a primary sun gear, a self-aligning bearing, a second retaining hole, and a first retaining shaft. One end of the intermediate gear is slidably connected to the drive shaft via a spline, and the other end is rotatably connected to the height adjustment shaft via the self-aligning bearing. The outer ring of the self-aligning bearing is mounted in the countersunk hole of the intermediate gear and axially fixed via the second retaining hole; the inner ring is mounted on the right end of the height adjustment shaft and axially fixed via the first retaining shaft, serving to radially position the intermediate gear and axially connect the height adjustment shaft and the intermediate gear. A radial positioning stop is provided on the right end face of the intermediate gear, and the drive shaft is provided with an external spline. The radial positioning stop and the outer circle of the external spline are fitted with a small clearance, allowing the intermediate gear to move axially along the drive shaft and simultaneously radially positioning the intermediate gear. The intermediate gear achieves radial positioning under the combined action of the self-aligning bearing and the radial positioning stop on the intermediate gear. The drive shaft is connected to the primary sun gear via a spline; the primary sun gear drives the planetary reducer to rotate.

[0009] The braking unit includes a friction pad assembly, a piston, and a housing; the friction pad assembly is sleeved between the drive shaft and the housing, and is located between the drive shaft and the housing; the piston presses against or separates the friction pad assembly.

[0010] In the preferred embodiment, when the bolt shaft passes through the first positioning hole and the fixing hole, the input gear shaft meshes with the intermediate gear.

[0011] When the bolt shaft passes through the second positioning hole and the fixing hole, the input gear shaft two meshes with the intermediate gear.

[0012] In a preferred embodiment, the height adjustment cover has a positioning groove with a radial cross-section of a parallel plane, and the height adjustment shaft has an insertion part with an axial cross-section of a parallel plane. The parallel plane of the axial cross-section of the insertion part has the same shape as the parallel plane of the axial cross-section of the positioning groove. The insertion part of the height adjustment shaft is inserted into the positioning groove, and the bolt shaft passes through the first positioning hole or the second positioning hole and the fixing hole, so that the height adjustment shaft and the height adjustment cover are radially synchronized.

[0013] In a preferred embodiment, an axial displacement space for an intermediate gear is provided inside the bearing housing, and the length of the axial displacement space for the intermediate gear is not less than the distance between the center of the first positioning hole and the center of the second positioning hole.

[0014] In a preferred embodiment, the axial movement direction of the height adjustment shaft is parallel to the axis of the transmission shaft, and the displacement endpoint is locked by a bolt shaft.

[0015] In a preferred embodiment, the spline is an involute spline or a rectangular spline.

[0016] The beneficial effects achieved by this utility model are as follows:

[0017] First, this utility model designs a reducer transmission system that employs a dual-motor input unit and a mechanical power switching unit working in tandem. The dual-motor input unit includes two independent input gear shafts, each capable of providing power independently. The power switching unit controls the meshing state of the input gear and the intermediate gear through the axial displacement of the height adjustment shaft, with the two preset positions of the height adjustment shaft locked by a bolt shaft. This dual-motor redundancy design allows the system to immediately switch to a backup motor in the event of a single motor failure, completely eliminating the risk of downtime due to motor malfunction. The mechanical positioning hole structure ensures simple and reliable switching operations, significantly shortening fault recovery time and guaranteeing continuous equipment operation.

[0018] Secondly, the transmission unit achieves axial sliding through the spline connection between the intermediate gear and the transmission shaft. The intermediate gear moves synchronously with the height adjustment shaft, enabling either input gear shaft one or input gear shaft two to precisely mesh with the intermediate gear. The transmission shaft is directly connected to the first-stage sun gear through the spline, driving the planetary reducer to complete power output. The intermediate gear moves freely in the axial displacement space through the action of the spline, reducing energy loss and improving the system's transmission efficiency and stability.

[0019] Third, the intermediate gear is slidably connected to the drive shaft via a spline. At the same time, the radial positioning stop on the right end face of the intermediate gear is fitted with the small clearance of the outer circle of the outer spline on the left side of the drive shaft, so that the intermediate gear can be radially positioned while ensuring that it can move axially along the drive shaft.

[0020] Fourth, this utility model sleeves the friction plate assembly on the drive shaft and the housing. The piston presses the friction plate assembly to make it contact the housing to achieve braking, or separates the friction plate assembly to release the drive shaft. The direct connection design between the braking unit and the drive shaft can lock the transmission chain before the motor is switched to prevent power loss during the switching process. The rapid response characteristics of the friction plate assembly provide a safety window for the operator and avoid secondary failures caused by accidental movement of the equipment. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0022] Figure 2 This is a left view of the overall structure of this utility model;

[0023] Figure 3 This is a sectional view of the mounting structure of the height adjustment shaft and the height adjustment cover;

[0024] Figure 4 This is a schematic diagram of the height adjustment shaft structure;

[0025] Figure 5 This is a schematic diagram of the height adjustment cover structure;

[0026] Figure 6 This is a diagram showing the installation structure of the intermediate gear and the height adjustment shaft;

[0027] Figure 7 This is a schematic diagram of the drive shaft and external spline structure.

[0028] Numbering on the map:

[0029] 1. Height adjustment shaft; 2. Height adjustment cover; 3. Sealing ring; 5. Bearing 1; 6. Height adjustment seat; 7. Hole clamp 1; 8. Hole clamp 2; 9. Self-aligning bearing; 10. Shaft clamp 1; 11. Motor seat 1; 12. Input gear shaft 1; 13. Bearing housing; 14. Intermediate gear; 14b. Radial positioning stop; 17. Drive shaft; 17a. Outer circle of external spline; 22. Housing; 25. Piston; 26. Friction plate assembly; 29. ​​First-stage sun gear; 31. Input gear shaft 2; 33. Motor seat 2; 34. Bolt shaft; 35. First positioning hole; 36. Second positioning hole; 37. Fixing hole. Detailed Implementation

[0030] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. This utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0031] Reference Figures 1-5 The switchable dual-motor reducer transmission system designed in this utility model includes a dual-motor input unit, a power switching unit, a transmission unit, and a braking unit. These units work together to achieve rapid switching in case of motor failure, ensuring continuous system operation. The system achieves power source switching through the cooperation of the height adjustment shaft 1 and the bolt shaft 34. The transmission shaft 17 connects to the reduction section, and the braking unit controls the locking and releasing of the transmission shaft 17. The specific structural structure is as follows:

[0032] The dual-motor input unit consists of two independent motors and their mounting structures, used to provide power input. The first motor is fixed to motor housing 11 and connected to input gear shaft 12, forming a first power input path. The second motor is fixed to motor housing 33 and connected to input gear shaft 31, forming a second power input path. Both input gear shaft 12 and input gear shaft 31 are mounted within bearing housing 13 and radially supported by the bearing housing 13. During normal operation, only one motor is active, with the other as a backup; both input gear shaft 12 and input gear shaft 31 are designed to selectively mesh with the intermediate gear 14, depending on the position of the power switching unit.

[0033] The power switching unit is responsible for switching the motor input path and includes a height adjustment shaft 1, a height adjustment cover 2, a bolt shaft 34, a height adjustment seat 6, three spaced bearings 5, and a locking clip 7. The height adjustment shaft 1 has a first positioning hole 35 and a second positioning hole 36 arranged in a front-to-back pattern to determine two switching positions. The height adjustment cover 2 has a fixing hole 37. The bolt shaft 34 selectively passes through the first positioning hole 35 and the fixing hole 37, or through the second positioning hole 36 and the fixing hole 37, thereby locking the axial position of the height adjustment shaft 1. The height adjustment cover 2 has a positioning groove with a radial cross-section of a parallel plane. The height adjustment shaft 1 has an insertion part with an axial cross-section of a parallel plane. The shape of this insertion part matches the positioning groove, allowing the insertion part of the height adjustment shaft 1 to be inserted into the positioning groove and then passed through by the bolt shaft 34, maintaining radial synchronization. The axial movement direction of the height adjustment shaft 1 is parallel to the axis of the transmission shaft 17. The displacement endpoint is locked by the bolt shaft 34, and an axial displacement space for the intermediate gear 14 is provided inside the bearing housing 13. The length of this space is not less than the distance between the center of the first positioning hole 35 and the center of the second positioning hole 36. Three spaced bearings 5 ​​are axially fixed to the height adjustment seat 6 through the hole clamps 7 to radially support the height adjustment shaft 1. The outer circle of the height adjustment shaft 1 is fitted with the inner hole of the bearing 5 with a small clearance, so that the height adjustment shaft 1 can move axially while being radially fixed in the height adjustment seat 6. A sealing ring 3 is installed between the height adjustment shaft 1 and the height adjustment cover 2 to seal the lubricating oil.

[0034] The transmission unit transmits motor power to the reduction section and includes an intermediate gear 14, a drive shaft 17, a primary sun gear 29, a self-aligning bearing 9, a second retaining clip 8, and a first retaining clip 10. One end of the intermediate gear 14 is connected to the drive shaft 17 via a spline for sliding transmission; the spline can be an involute spline or a rectangular spline. The other end of the intermediate gear 14 is rotatably connected to the height adjustment shaft 1 via the self-aligning bearing 9. The outer ring of the self-aligning bearing 9 is installed in the countersunk hole of the intermediate gear 14 and axially fixed by the second retaining clip 8, while the inner ring is installed at the right end of the height adjustment shaft 1 and axially fixed by the first retaining clip 10, for radial positioning of the intermediate gear 14 and axial connection between the height adjustment shaft 1 and the intermediate gear 14. The right end face of the intermediate gear 14 is provided with a radial positioning stop 14b, and the drive shaft 17 is provided with an external spline 17a. The radial positioning stop 14b and the outer circle of the external spline 17a are in a small clearance fit, allowing the intermediate gear 14 to move axially along the drive shaft 17 and simultaneously providing radial positioning for the intermediate gear 14. The drive shaft 17 is connected to the primary sun gear 29 via a spline. The primary sun gear 29 drives the planetary reducer, which includes the primary sun gear 29 and its meshing planet gears. The planet gears are mounted on a planet carrier and ultimately output power through the ring gear. When the bolt shaft 34 passes through the first positioning hole 35 and the fixing hole 37, the input gear shaft 12 meshes with the intermediate gear 14; when the bolt shaft 34 passes through the second positioning hole 36 and the fixing hole 37, the input gear shaft 21 meshes with the intermediate gear 14.

[0035] The braking unit controls the braking state of the drive shaft 17 and includes a friction pad assembly 26, a piston 25, and a housing 22. The friction pad assembly 26 is fitted onto the drive shaft 17, located between the drive shaft 17 and the housing 22, and is locked by friction. The piston 25 presses against or releases the friction pad assembly 26. When the piston 25 presses against the friction pad assembly 26, the drive shaft 17 is fixed and does not rotate, and the system is in a braking state. When the piston 25 moves away from the friction pad assembly 26, the drive shaft 17 rotates freely, allowing the reducer to operate normally. The housing 22 provides overall support and is integrated with the braking unit.

[0036] All units are coordinated within the housing: the motor mounts 11 and 33 of the dual-motor input unit are fixed to the system base; the input gear shafts 12 and 31 selectively mesh with the intermediate gear 14 under the control of the switching unit. The axial displacement space of the intermediate gear 14 allows it to move during power switching; the movement of the height adjustment shaft 1 is locked to the height adjustment cover 2 by bolt shaft 34. The drive shaft 17 runs through the entire system, with one end connected to the intermediate gear 14 via a spline and the other end connected to the first-stage sun gear 29, driving the planetary reducer output to the ring gear. The friction plate assembly 26 of the braking unit is directly fitted onto the drive shaft 17, ensuring rapid braking in case of failure. This structure ensures system compactness and enables rapid switching in case of motor failure.

[0037] The working process of the switchable dual-motor reducer transmission system of this utility model is as follows:

[0038] The first motor is fixed on motor mount 11 and drives input gear shaft 12; the second motor is fixed on motor mount 33 and drives input gear shaft 31. During normal operation, only one motor is active, while the other is in standby mode. This dual-motor redundancy design ensures continuous system operation in the event of a single failure, preventing equipment downtime due to motor replacement.

[0039] When the first motor is working normally, the first positioning hole 35 of the height adjustment shaft 1 and the fixing hole 37 of the height adjustment cover 2 are axially locked by the bolt shaft 34. At this time, the input gear shaft 12 meshes with the intermediate gear 14.

[0040] If the first motor fails, it is necessary to switch to the second motor. Remove the bolt shaft 34 and push the height adjustment shaft 1 inward along a direction parallel to the axis of the transmission shaft 17; align the second positioning hole 36 of the height adjustment shaft 1 with the fixing hole 37, and reinsert the bolt shaft 34 to lock it. During this process, the intermediate gear 14 moves axially synchronously with the height adjustment shaft 1; the intermediate gear 14 achieves radial positioning through the small clearance fit between the radial positioning stop 14b and the outer circle of the outer spline 17a, ensuring precise gear meshing without misalignment during movement. The rectangular insertion part of the height adjustment shaft 1 cooperates with the rectangular positioning groove of the height adjustment cover 2 to ensure radial synchronization and prevent gear misalignment during switching. The axial displacement space length of the intermediate gear 14 reserved in the housing is not less than the distance between the first positioning hole 35 and the second positioning hole 36, ensuring freedom of movement.

[0041] The first motor's operating path involves input gear shaft 12 meshing with intermediate gear 14. Intermediate gear 14 transmits power to drive shaft 17 via splines. Drive shaft 17 drives primary sun gear 29 via splines. Primary sun gear 29 drives planetary gears for speed reduction, and power is output through the ring gear. The second motor's operating path involves input gear shaft 31 meshing with intermediate gear 14, and the subsequent path is the same.

[0042] The spline connection between the intermediate gear 14 and the drive shaft 17 allows axial sliding, which, in conjunction with the movement of the height adjustment shaft 1, enables seamless switching; the first-stage sun gear 29 is directly connected to the drive shaft 17, reducing the complexity of the transmission chain and improving efficiency.

[0043] The friction plate assembly 26 is fitted between the drive shaft 17 and the housing 22. When braking is required, the piston 25 presses the friction plate assembly 26 to lock the drive shaft 17; during normal operation, the piston 25 separates the friction plate assembly 26 and releases the drive shaft 17.

[0044] The braking unit is directly integrated with the drive shaft 17, which can instantly lock the drive chain in case of failure, providing a safe operating window for motor switching.

[0045] This utility model uses mechanical positioning holes 35 and 36, and bolt shaft 34 for locking, to complete motor switching within 10 minutes; height adjustment shaft 1, intermediate gear 14, and braking unit are set along the axis of transmission shaft 17 to ensure accurate and stable transmission; braking unit friction plate group 26 prevents power loss during switching, and redundant motor design eliminates downtime losses.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A switchable dual-motor reducer transmission system, characterized in that, include: The bearing housing (13) and the first motor input unit and the second motor input unit installed in the bearing housing (13); the first motor input unit includes an input gear shaft (12), a first motor and a motor base (11); the second motor input unit includes an input gear shaft (31), a second motor and a motor base (33); wherein the first motor is fixed to the motor base (11) and connected to the input gear shaft (12); the second motor is fixed to the motor base (33) and connected to the input gear shaft (31); The power switching unit includes a height adjustment shaft (1), a height adjustment cover (2), a bolt shaft (34), a height adjustment seat (6), three spaced bearings (5), three hole clips (7), and a sealing ring (3). The height adjustment shaft (1) is provided with a first positioning hole (35) and a second positioning hole (36) arranged in a front-to-back manner. The height adjustment cover (2) is provided with a fixing hole (37). The bolt shaft (34) selectively passes through the first positioning hole (35) and the fixing hole (37), or passes through the second positioning hole (36) and the fixing hole (37). The three spaced bearings (5) are axially fixed to the height adjustment seat (6) through the hole clips (7) to radially support the height adjustment shaft (1). The outer circle of the height adjustment shaft (1) is fitted with the inner hole of the bearing (5) with a small clearance, so that the height adjustment shaft (1) can move axially while being radially fixed in the height adjustment seat (6). A sealing ring (3) for sealing the lubricating oil in the reducer transmission system is installed between the height adjustment shaft (1) and the height adjustment cover (2). The transmission unit includes an intermediate gear (14), a drive shaft (17), a primary sun gear (29), a self-aligning bearing (9), a second hole clamp (8), and a first shaft clamp (10). One end of the intermediate gear (14) is slidably connected to the drive shaft (17) via a spline, and the other end is rotatably connected to the height adjustment shaft (1) via the self-aligning bearing (9). The self-aligning bearing (9) has its outer ring installed in the countersunk hole of the intermediate gear (14) and axially fixed by the second hole clamp (8), and its inner ring installed at the right end of the height adjustment shaft (1) and axially fixed by the first shaft clamp (10), for radial positioning of the intermediate gear (14) and axial connection of the height adjustment shaft (19). 1) and intermediate gear (14); the right end face of intermediate gear (14) is provided with radial positioning stop (14b), and the transmission shaft (17) is provided with external spline (17a). The radial positioning stop (14b) and the outer circle of external spline (17a) are in small clearance fit, so that intermediate gear (14) can move axially along the transmission shaft (17) and at the same time, the intermediate gear (14) can be radially positioned; the intermediate gear is radially positioned under the combined action of self-aligning bearing (9) and radial positioning stop (14b) on intermediate gear (14); the transmission shaft (17) is connected to the first-stage sun gear (29) through spline; the first-stage sun gear (29) drives the planetary reducer to rotate; The braking unit includes a friction pad assembly (26), a piston (25), and a housing (22); the friction pad assembly (26) is sleeved between the drive shaft (17) and the housing (22), and is located between the drive shaft (17) and the housing (22); the piston (25) presses against or separates the friction pad assembly (26).

2. The system according to claim 1, characterized in that: When the bolt shaft (34) passes through the first positioning hole (35) and the fixing hole (37), the input gear shaft (12) meshes with the intermediate gear (14); When the bolt shaft (34) passes through the second positioning hole (36) and the fixing hole (37), the input gear shaft (31) meshes with the intermediate gear (14).

3. The system according to claim 2, characterized in that: The height adjustment cover (2) has a positioning groove with a radial cross section of a parallel plane. The height adjustment shaft (1) has an insertion part with an axial cross section of a parallel plane. The parallel plane of the axial cross section of the insertion part is consistent with the shape of the parallel plane of the axial cross section of the positioning groove. The insertion part of the height adjustment shaft (1) is inserted into the positioning groove, and the bolt shaft (34) passes through the first positioning hole (35) or the second positioning hole (36) and the fixing hole (37), so that the height adjustment shaft (1) and the height adjustment cover (2) are radially synchronized.

4. The system according to claim 1, characterized in that: An axial displacement space for an intermediate gear (14) is provided inside the bearing housing (13). The length of the axial displacement space of the intermediate gear (14) is not less than the distance between the center of the first positioning hole (35) and the center of the second positioning hole (36).

5. The system according to claim 1, characterized in that: The axial movement direction of the height adjustment shaft (1) is parallel to the axis of the transmission shaft (17), and the displacement endpoint is locked by the bolt shaft (34).

6. The system according to claim 1, characterized in that: The spline is an involute spline or a rectangular spline.

Images