Motor integrated with speed reducer

Abstract

The invention discloses a motor integrated with a speed reducer, the motor is sequentially connected with a plurality of planetary gear mechanisms and a connecting shaft used for outputting power, the motor is used for driving a sun gear of the closest planetary gear mechanism, and the sun gear of the subsequent planetary gear mechanism is driven by a planet carrier of the previous adjacent planetary gear mechanism; the planet carrier of the planetary gear mechanism farthest from the motor is used for driving the connecting shaft to rotate; planet carriers of the planetary gear mechanisms are disc-shaped, and the planet carriers of every two adjacent planetary gear mechanisms are connected with the sun gear through splines; a rotating shaft is arranged at the bottom of the planet carrier and rotationally connected with a planet wheel. The device is compact in structure, small in size and convenient to install.

Description

Technical Field

[0001] The invention relates to a motor, in particular to a motor with an integrated speed reducer. Background Art

[0002] As a conventional driving device, the motor needs to be decelerated to output sufficient torque in the usage scenario where a large output torque is required. Currently, an external coupling is often used to connect the reducer. Although this form can achieve the above functions, the overall structure of this form is complex and large in size, and centering operation is required during the installation process, which makes installation difficult.

[0003] In addition to using external reducers, there are also cases where direct-drive permanent magnet motors are directly used to provide sufficient torque. However, at the same power level, the higher the motor speed, the smaller the torque required by the motor and the smaller the size; and the lower the motor speed, the higher the torque requirement of the motor and the larger the size of the motor. When a larger output torque is required, the motor output shaft speed cannot be too fast. Therefore, for low-speed permanent magnet direct-drive motors, especially in high-power cases, their size and weight will increase accordingly. Therefore, when using direct-drive permanent magnet motors, although the coupling and reducer are removed, the size is still large and it is still not easy to install. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a motor with an integrated reduction device which has a compact structure, a small size and is easy to install.

[0005] Technical solution: The present invention describes an electric motor with an integrated reduction device, wherein the motor is sequentially connected to multiple planetary gear mechanisms and a connecting shaft for outputting power, the motor is used to drive the sun gear of the closest planetary gear mechanism, and the sun gear of the subsequent planetary gear mechanism is driven by the planetary carrier of the previous adjacent planetary gear mechanism; the planetary carrier of the planetary gear mechanism farthest from the motor is used to drive the connecting shaft to rotate.

[0006] Based on the above technical solution, the connecting shaft of the motor is connected to multiple planetary gear mechanisms in sequence and then connected to the connecting shaft. Because the planetary gear mechanism is more compact and smaller than the parallel shaft or orthogonal shaft reducer, the use of the planetary gear mechanism for deceleration can itself reduce the size of the device. When all other parameters are the same, to achieve the same deceleration effect, a single planetary gear mechanism requires a larger outer diameter for deceleration than two planetary gear systems for deceleration together. The present invention uses multiple planetary gear mechanisms connected in sequence to jointly achieve a reduction ratio than a single planetary gear mechanism. The outer diameter of the entire device can be set smaller, and the axial volume will not increase too much, which further reduces the size of the device and also reduces the weight of the device, which can provide a larger torque and is easy to install. Moreover, the use of multiple planetary gear mechanisms in cooperation with each other can more flexibly configure the structural parameters in each planetary gear mechanism to achieve a wider speed regulation range, and integrate the motor and the planetary gear mechanism into a whole, so that there is no need for alignment during installation, and the installation is more convenient.

[0007] Preferably, the planet carrier of the planetary gear mechanism is disc-shaped, and the planet carriers of two adjacent planetary gear mechanisms are connected to the sun gear via a spline; a rotating shaft is provided at the bottom of the planet carrier, and the planetary gear is rotatably connected to the rotating shaft.

[0008] The planet carrier is disc-shaped and is respectively mounted on the sun gear and the connecting shaft and connected by splines to achieve stable and effective transmission.

[0009] Preferably, the gear parameters of the planetary gears of the multiple planetary gear mechanisms are the same.

[0010] The gear parameters of the two planetary gears are the same, so the internal tooth parameters of the housing can also be unified, making manufacturing more convenient.

[0011] Preferably, the gear parameters of the planetary gears of the plurality of planetary gear mechanisms are different.

[0012] The gear parameters of the planetary gears of the multiple planetary gear mechanisms are different, so the speed regulation range can be adjusted more flexibly.

[0013] Preferably, the plurality of planetary gear mechanisms are installed in a housing which serves as its ring gear.

[0014] By directly using the housing as the ring gear of multiple planetary gear mechanisms, there is no need to respectively provide independent ring gears for the multiple planetary gear mechanisms, which also simplifies the structure and reduces the overall size of the device.

[0015] Preferably, the connecting shaft is rotatably connected to the housing.

[0016] Preferably, the output shaft of the motor passes through the housing and is connected to the sun gear of the nearest planetary gear mechanism, and a cooling mechanism is provided at the connection between the output shaft and the housing.

[0017] The original speed of the motor is relatively high. When the motor output shaft and the housing are connected, the temperature is likely to be too high when the motor is working for a long time. Setting a cooling mechanism can ensure that the device works normally for a long time.

[0018] Preferably, the temperature reduction mechanism comprises a cooling ring sleeved on the outside of the motor output shaft, and a coolant flows in the cooling ring.

[0019] Preferably, the cooling ring is a pipe formed into an annular structure by multiple layers of spiral winding.

[0020] The cooling ring adopts a multi-layer spiral winding structure to increase the residence time of the coolant at the connection and enhance the cooling effect.

[0021] Preferably, adjacent end faces of adjacent sun gears of the plurality of planetary gear mechanisms and adjacent end faces of the sun gear and the connecting shaft are in contact with each other, and the adjacent end faces are hardened and provided with lubricating oil channels.

[0022] Adjacent end faces are in contact with each other, so that the previous sun gear in the multiple planetary gear mechanisms can serve as a support for the next sun gear, and the sun gear adjacent to the connecting shaft serves as its support. This eliminates the need for additional corresponding bearing mechanisms, simplifies the overall structure of the device, and makes the device more compact; and the hardening treatment of adjacent end faces can ensure that the end faces can withstand long-term rotational friction, and the provision of lubricating oil channels can lubricate the adjacent end faces to reduce friction losses.

[0023] Beneficial effects: Compared with the prior art, the present invention has the following significant effects: multiple planetary gear mechanisms are used to reduce the speed of the motor, which not only ensures the output torque but also makes the entire device compact and small in size, making it easy to install; secondly, the cooperation of multiple planetary gear mechanisms increases the speed regulation range, and the motor and the planetary gear mechanism are integrated into a whole, and there is no need to align them with the coupling and the reducer during installation, making installation easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a front cross-sectional view of the drive system; Figure 2 A top view of the drive system. DETAILED DESCRIPTION

[0025] As shown in the figure, the motor of the integrated reduction device described in the present invention, the motor 1 is connected in sequence to multiple planetary gear mechanisms and a connecting shaft 2 for outputting power, the motor 1 is used to drive the sun gear of the closest planetary gear mechanism, and the sun gear of the subsequent planetary gear mechanism is driven by the planetary carrier of the previous adjacent planetary gear mechanism; the planetary carrier of the planetary gear mechanism farthest from the motor 1 is used to drive the connecting shaft 2 to rotate.

[0026] The following takes the example of connecting two planetary gear mechanisms between the motor 1 and the connecting shaft 2 as an example, but the number of planetary gear mechanisms can be set according to actual needs. For the convenience of description, they are named as the first planetary gear mechanism 5 and the second planetary gear mechanism 6 in order from near to far from the motor 1.

[0027] The first planetary gear mechanism 5 and the second planetary gear mechanism 6 are installed in the housing 3 from bottom to top, and the inner wall of the housing 3 is provided with teeth as the ring gears of the two planetary gear mechanisms; each planetary gear mechanism includes a sun gear, a planet carrier and a planetary gear, the planet carrier is disc-shaped, and the planetary gear is connected to the planet carrier through the eccentric rotation of the rotating shaft at the bottom of the planet carrier, the ring gears of the two planetary gear mechanisms, that is, the housing 3, are fixed, the sun gear is used as the power input, and the planet carrier is the power output of the planetary gear system.

[0028] For the sake of convenience, the components of the two planetary gear mechanisms 2 are marked with numbers to distinguish them. Specifically, the first planetary gear mechanism 5 includes: a first sun gear 5-1, a first planet carrier 5-2 and a first planet gear 5-3; the second planetary gear mechanism 6 includes: a second sun gear 6-1, a second planet carrier 6-2 and a second planet gear 6-3.

[0029] The first planetary carrier 5-2 is mounted on the bottom of the second sun gear 6-1, and the two are connected by a spline; the second planetary carrier 6-2 is mounted on the bottom of the connecting shaft 2, and the two are also connected by a spline. The top end face of the first sun gear 5-1 is in contact with the bottom end face of the second sun gear 6-1, and the top end face of the second sun gear 6-1 is in contact with the bottom end face of the connecting shaft 2. The end faces that contact each other are hardened. The hardening treatment can adopt the conventional metal surface hardening treatment process in the prior art, and a lubricating oil channel is provided.

[0030] The first planetary carrier 5-2 drives the second sun gear 6-1 to rotate as the power output of the first planetary gear mechanism 5, and then drives the second planetary carrier 6-2 as the power output of the second planetary gear mechanism 6 to rotate, that is, the motor 1 drives the connecting shaft 2 to rotate and output torque outward after being decelerated by the two planetary gear mechanisms, thereby ensuring sufficient output torque.

[0031] The top of the shell 3 is rotatably connected with a connecting shaft 2, and the output shaft of the motor 1 passes through the bottom of the shell 3 and is connected to the sun gear of the first planetary gear mechanism 5 to drive it to rotate. A cooling device is provided at the connection between the output shaft of the motor 1 and the shell 3 to prevent overheating at the connection between the two.

[0032] The cooling mechanism includes a cooling ring 4 which is sleeved on the outside of the connecting shaft of the motor 1. The cooling ring 4 is a pipe formed by multiple layers of spiral winding to form an annular structure. Cooling liquid flows in the cooling ring 4. Both ends of the cooling ring 4 pass through the side walls of the shell 3 to connect to the refrigerant delivery device. The refrigerant can be water or other liquids such as a solution containing ethylene glycol.

[0033] The shell 3 can adopt a segmented structure, including an upper end cover 3-1, a ring body 3-2 and a lower end cover 3-3 connected from top to bottom, and the ring body 3-2 is provided with internal teeth as the gear rings of two planetary gear mechanisms; the lower end cover 3-3 is connected to the mounting base 7; the gear parameters of the planetary wheels of the two planetary gear mechanisms are the same, so the gear parameters of the internal teeth of the upper and lower parts of the inner wall of the ring body 3-2 can also be unified and can be formed in one piece; the gear parameters of the planetary wheels of the two planetary gear mechanisms can also be different, and the corresponding internal teeth of the ring body 3-2 should also be adjusted accordingly.

[0034] The device can be used in a variety of postures, such as horizontal, vertical or diagonal, depending on actual needs.

Claims

1. A motor with an integrated reduction device, comprising a motor (1), characterized in that: The motor (1) is sequentially connected to a plurality of planetary gear mechanisms and a connecting shaft (2) for outputting power; the motor (1) is used to drive the sun gear of the closest planetary gear mechanism, and the sun gear of the subsequent planetary gear mechanism is driven by the planet carrier of the previous adjacent planetary gear mechanism; the planet carrier of the planetary gear mechanism farthest from the motor (1) is used to drive the connecting shaft (2) to rotate.

2. The motor with integrated reduction gear according to claim 1, characterized in that: The planet carrier of the planetary gear mechanism is disc-shaped, and the planet carriers of two adjacent planetary gear mechanisms are connected to the sun gear via splines; a rotating shaft is provided at the bottom of the planet carrier, and the planet gear is rotatably connected to the rotating shaft.

3. The motor with integrated reduction gear according to claim 2, characterized in that: The gear parameters of the planetary gears of the plurality of planetary gear mechanisms are the same.

4. The motor with integrated reduction gear according to claim 2, characterized in that: The planetary gears of the plurality of planetary gear mechanisms have different gear parameters.

5. The motor with integrated reduction device according to claim 1, characterized in that: The plurality of planetary gear mechanisms are installed in a housing (3) which serves as a ring gear thereof.

6. The motor with integrated reduction gear according to claim 5, characterized in that: The connecting shaft (2) is rotatably connected to the housing (3).

7. The motor with integrated reduction gear according to claim 6, characterized in that: The output shaft of the motor (1) passes through the housing (3) and is connected to the sun gear of the nearest planetary gear mechanism; a cooling mechanism is provided at the connection between the output shaft and the housing (3).

8. The motor with integrated reduction gear according to claim 7, characterized in that: The temperature reduction mechanism comprises a cooling ring (4) sleeved on the outside of the output shaft of the motor (1), and a coolant flows in the cooling ring (4).

9. The motor with integrated reduction device according to claim 8, characterized in that: The cooling ring (4) is a pipe formed into a ring structure by spirally winding multiple layers.

10. The motor with integrated reduction gear according to claim 1, characterized in that: The adjacent end faces of the sun gears of the plurality of planetary gear mechanisms and the sun gears and the connecting shaft (2) are in contact with each other, and the adjacent end faces are hardened and provided with lubricating oil channels.

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