Motor shaft and gear connection structure and assembly method

Abstract

The application relates to a motor shaft and gear connecting structure and an assembling method. The motor shaft and gear connecting structure comprises an output shaft and a transmission gear. One end of the output shaft is connected with a motor. The peripheral wall of the other end of the output shaft is connected with the inner diameter of the transmission gear. The shaft diameter of the output shaft gradually decreases in the direction away from the motor and in the direction towards the motor. The application has the effects of avoiding stress concentration on the output shaft of the motor and reducing the probability of stress damage of the output shaft of the motor.

Description

Technical Field

[0001] This application relates to the technical field of shaft and tooth connection structures, and in particular to a motor shaft and tooth connection structure and assembly method. Background Technology

[0002] The power of an electric motor is transmitted through a drive gear connected to the motor's output shaft. The output shaft drives the drive gear to rotate, thereby transmitting the power to the outside world.

[0003] The existing method of transmitting power in motors is generally as follows: the output shaft of the motor is set to a D-shape, and the D-shaped motor output shaft cooperates with the transmission gear, thereby driving the transmission gear to rotate synchronously with the output shaft, so that the power of the motor is transmitted to the transmission gear.

[0004] In the existing technology, when the motor outputs power, the rotation of the transmission gear is driven by the two sides of the D-shaped output shaft. The reaction force of the transmission gear at the connection between the D-shaped motor output shaft and the transmission gear is mainly concentrated at the two ends of the D-shaped output shaft. The two ends of the D-shaped output shaft will have a large stress concentration, which can easily lead to damage to the motor output shaft. Summary of the Invention

[0005] In order to avoid stress concentration on the output shaft of the motor and reduce the probability of stress damage to the output shaft, this application provides a motor shaft gear connection structure and assembly method.

[0006] The technical solution provided in this application for a motor shaft gear connection structure and assembly method is as follows: A motor shaft gear connection structure includes an output shaft and a transmission gear. One end of the output shaft is used to connect to a motor. The shaft diameter of the output shaft gradually decreases in the direction away from the motor and towards the motor. The peripheral wall of the other end of the output shaft is connected to the inner diameter of the transmission gear. The transmission gear is inclined at the meshing point with the output shaft.

[0007] By adopting the above technical solution, the peripheral wall of the motor output shaft is inclined, and the inner diameter of the transmission gear is connected to the inclined peripheral wall of the output shaft. This increases the contact area between the transmission gear and the motor output shaft, making the reaction force of the transmission gear on the motor output shaft more dispersed. This avoids stress concentration on the motor output shaft and reduces the probability of stress damage to the motor output shaft.

[0008] Optionally, the peripheral wall of the output shaft is provided with a first connecting part and a second connecting part. The first connecting part is located on the side of the second connecting part away from the motor. Both the first connecting part and the second connecting part are provided with a connecting mechanism for connecting the transmission gear. The connecting mechanism is used to drive the transmission gear to rotate synchronously with the output shaft.

[0009] By adopting the above technical solution, the connection relationship between the motor's output shaft and the transmission gear differs depending on whether the environment is above or below room temperature. In environments above room temperature, both the transmission gear and the output shaft expand, reducing the gap between them. In environments below room temperature, the motor's output shaft and the transmission gear contract, increasing the distance between them. By placing the first connecting part on the side of the second connecting part away from the motor, the output shaft diameter of the first connecting part is larger than that of the second connecting part. This ensures that the transmission gear can tightly engage with the motor's output shaft in both above and below room temperature environments, thereby improving the motor's power transmission efficiency.

[0010] Optionally, the connecting mechanism includes a first transmission surface, on which a first transmission tooth is provided, the first transmission tooth being arranged along the axial direction of the output shaft, and the inner diameter peripheral wall of the transmission gear being provided with a first mating tooth that mates with the first transmission tooth.

[0011] By adopting the above technical solution, the inclined first transmission surface cooperates with the inner diameter circumferential wall of the transmission gear, which increases the contact area between the output shaft and the transmission gear. This disperses some of the stress on the motor output shaft to the end of the output shaft away from the motor, avoiding stress concentration at the motor output shaft and transmission gear, and reducing the probability of stress damage to the motor output shaft.

[0012] Optionally, the connecting mechanism further includes a second transmission surface, on which a second transmission tooth is provided. The second transmission tooth is arranged radially along the output shaft, and a second mating tooth is provided on the peripheral wall of the transmission gear on the side opposite to the motor, which engages with the second transmission tooth.

[0013] By adopting the above technical solution, by setting a second transmission surface on the output shaft to abut against the side of the transmission gear away from the motor, the probability of the transmission gear moving away from the motor is reduced, thereby improving the power transmission efficiency of the motor. At the same time, the second transmission surface further increases the contact area between the transmission gear and the output shaft, increasing the power transmission efficiency of the output shaft while dispersing the stress at the connection between the output shaft and the transmission gear, avoiding stress concentration at the connection between the output shaft and the transmission gear, and reducing the probability of the motor output shaft being damaged by stress.

[0014] Optionally, the bottom end of the first transmission surface of the connecting mechanism on the second connecting part is connected to the end of the second transmission surface of the connecting mechanism on the second connecting part that is away from the axis of the output shaft.

[0015] By adopting the above technical solution, the temperature of the transmission gear located at the second connecting part decreases, which increases the distance between the transmission gear and the output shaft. When it exceeds the second transmission surface of the second connecting part, it can smoothly enter the first transmission surface of the first connecting part, thus avoiding the transmission gear from separating from the output shaft due to excessively low temperature, which would significantly reduce the power transmission efficiency of the motor.

[0016] Optionally, a contacting mechanism is provided on the side of the transmission gear facing the motor. The contacting mechanism is fixedly connected to the output shaft and is used to press the transmission gear against the peripheral wall of the output shaft.

[0017] By adopting the above technical solution, an abutment mechanism is set on the side of the transmission gear facing the motor, so that the transmission gear can always be pressed against the output shaft of the motor, reducing the impact of temperature changes on the connection between the transmission gear and the output shaft.

[0018] Optionally, the abutting mechanism includes a connecting seat, an abutting ring, and an elastic element. The connecting seat is fixedly connected to the peripheral wall of the output shaft. The abutting ring coaxially abuts against the side of the transmission gear near the motor. The side of the abutting ring away from the transmission gear is connected to one end of the elastic element, and the other end of the elastic element is connected to the connecting seat.

[0019] By adopting the above technical solution, the connecting seat that fixes the output shaft allows the abutment mechanism to rotate synchronously with the output shaft, thereby reducing the friction between the abutment structure and the transmission gear. The elastic element ensures that the abutment ring always abuts against the transmission gear, applying a force away from the motor to the transmission gear. This makes the inner diameter circumference of the transmission gear abut more tightly against the first transmission surface, or the side of the transmission gear closer to the motor abut more tightly against the second transmission surface, thereby improving the power transmission efficiency of the motor.

[0020] An assembly method for a motor shaft gear connection structure, comprising the following steps: Connect the smaller end of the output shaft to the motor; heat the transmission gear; pass the inner diameter of the transmission gear through the larger end of the output shaft; cool the transmission gear so that the inner diameter of the transmission gear abuts against the peripheral wall of the output shaft.

[0021] By employing the above technical solution, the transmission gear is heated, increasing its inner diameter, thus allowing it to be fitted onto the motor's output shaft for engagement. After the transmission gear is fitted onto the motor's output shaft, it is cooled, reducing its inner diameter and ensuring a tight fit between the inner diameter and the circumferential wall of the motor's output shaft.

[0022] Optionally, the output shaft peripheral wall is provided with a first connecting part, which is located at the end of the output shaft away from the motor. When the motor is operating in an environment with a temperature higher than normal, the inner diameter peripheral wall of the transmission gear is connected to the first connecting part of the output shaft.

[0023] By adopting the above technical solution, the first connecting part of the transmission gear to the output shaft is connected in an environment with a temperature higher than normal. When the temperature of the transmission gear continues to rise, the transmission gear and the output shaft expand, and the connection between the transmission gear and the output shaft of the motor becomes tighter. The transmission gear puts greater pressure on the output shaft, and the output shaft diameter of the first connecting part is larger, which reduces the probability of the transmission gear damaging the output shaft in an environment with a temperature higher than normal.

[0024] Optionally, the output shaft peripheral wall is provided with a second connecting part, which is located at the end of the output shaft near the motor. When the motor is working in an environment below normal temperature, the inner diameter peripheral wall of the transmission gear is connected to the second connecting part of the output shaft.

[0025] By adopting the above technical solution, the second connection part of the transmission gear connected to the output shaft is located in an environment below normal temperature. When the temperature of the transmission gear and the output shaft of the motor decreases due to environmental influences, the gap between the transmission gear and the output shaft increases further. Under the action of the abutment structure, the transmission gear can move away from the motor and always stay close to the output shaft. When the temperature of the transmission gear and the output shaft increases, the connection between the transmission gear and the output shaft will be tighter. As the transmission gear moves away from the motor, the diameter of the output shaft increases, and the probability of the output shaft being crushed by the transmission gear decreases.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The diameter of the output shaft gradually decreases from the direction away from the motor towards the motor, so that the peripheral wall of the motor output shaft is inclined. This increases the contact area between the transmission gear and the motor output shaft, making the reaction force of the transmission gear on the output shaft more dispersed, avoiding stress concentration on the motor output shaft, and reducing the probability of stress damage to the motor output shaft. 2. By designating the end of the motor's output shaft closest to the motor as the second connecting part and the end of the output shaft away from the motor as the first connecting part, and connecting the first connecting part of the output shaft of the motor operating in an environment above normal temperature to the transmission gear, the probability of the output shaft being crushed and damaged by the transmission gear is reduced. By connecting the second connecting part of the output shaft of the motor operating in an environment below normal temperature to the transmission gear, the transmission efficiency of the motor is improved and the probability of the output shaft being crushed and damaged by the transmission gear is reduced. 3. By setting the connecting mechanism as the first transmission surface and the second transmission surface, the contact area between the transmission gear and the output shaft of the motor is increased, making the transmission gear and the output shaft more tightly connected, increasing the power transmission efficiency of the motor output shaft, and reducing the probability of the connection between the output shaft and the transmission gear being damaged due to stress concentration. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the external structure of an embodiment of this application.

[0028] Figure 2 This is a cross-sectional structural diagram of an embodiment of this application.

[0029] Figure 3 This is a schematic diagram of the transmission gear structure according to an embodiment of this application.

[0030] In the figure: 1. Output shaft; 11. First connecting part; 12. Second connecting part; 2. Transmission gear; 21. First mating tooth; 22. Second mating tooth; 3. Motor; 4. Connecting mechanism; 41. First transmission surface; 411. First transmission tooth; 42. Second transmission surface; 421. Second transmission tooth; 5. Abutting mechanism; 51. Connecting seat; 52. Abutting ring; 53. Elastic element. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0032] This application discloses a motor shaft gear connection structure and assembly method. (Refer to...) Figure 1 and Figure 2 A motor shaft gear connection structure includes an output shaft 1 and a transmission gear 2. One end of the output shaft 1 is connected to a motor 3, and the other end of the output shaft 1 is located outside the motor 3 and coaxially meshes with the transmission gear 2. The shaft diameter of the output shaft 1 gradually decreases in the direction away from the motor 3 and towards the motor 3. The meshing point between the transmission gear 2 and the output shaft 1 is an inclined plane.

[0033] By tilting the peripheral wall of the output shaft 1, the diameter of the output shaft 1 increases the further away from the motor 3. Compared to the traditional peripheral wall of the output shaft 1 arranged parallel to its axis, the tilted peripheral wall also increases the contact area between the transmission gear 2 and the output shaft 1. Therefore, the reaction force exerted by the transmission gear 2 on the output shaft 1 is dispersed over a wider area by the tilted peripheral wall of the output shaft 1, avoiding stress concentration on the output shaft 1 of the motor 3 and reducing the probability of stress damage to the output shaft 1 of the motor 3.

[0034] Reference Figure 2 and Figure 3A connecting mechanism 4 is provided on the peripheral wall of the output shaft 1, connecting the output shaft 1 and the transmission gear 2. The connecting mechanism 4 includes a first transmission surface 41 and a second transmission surface 42. A first transmission tooth 411 is provided on the first transmission surface 41, and the first transmission tooth 411 is arranged along the axial direction of the output shaft 1. A second transmission tooth 421 is provided on the second transmission surface 42, and the second transmission tooth 421 is arranged along the radial direction of the output shaft 1. A first mating tooth 21 that mates with the first transmission tooth 411 is provided on the inner diameter peripheral wall of the transmission gear 2, and a second mating tooth 22 that mates with the second transmission tooth 421 is provided on the side of the transmission gear 2 away from the motor 3.

[0035] When motor 3 is working, it drives output shaft 1 to rotate. Through connecting mechanism 4, the output shaft 1 allows the first transmission gear 411 to mesh with the first mating gear 21, and the second transmission gear 421 to mesh with the second mating gear 22, thereby driving transmission gear 2 to rotate synchronously with output shaft 1. By arranging the first transmission gear 411 on the inclined first transmission surface 41 and along a direction perpendicular to the axis of output shaft 1, the contact area between transmission gear 2 and output shaft 1 is increased, making the reaction force exerted by transmission gear 2 on output shaft 1 more dispersed, thus reducing the probability of output shaft 1 being damaged due to stress concentration. By arranging the second transmission gear 421 perpendicular to the axis of output shaft 1, output shaft 1 can abut against transmission gear 2 through the second transmission gear 421, making the fit between transmission gear 2 and output shaft 1 tighter, thereby increasing the transmission efficiency of output shaft 1.

[0036] Reference Figure 1 and Figure 2 The output shaft 1 is provided with a second connecting part 12 and a first connecting part 11. The second connecting part 12 is located at the end of the first connecting part 11 that is close to the motor 3. The first connecting part 11 and the second connecting part 12 are evenly provided with connecting mechanisms 4. The end of the first transmission surface 41 of the connecting mechanism 4 of the first connecting part 11 that is close to the motor 3 is fixedly connected to the end of the second transmission surface 42 of the connecting mechanism 4 of the second connecting part 12 that is away from the axis of the output shaft 1.

[0037] By placing the second connecting part 12 at one end of the first connecting part 11 near the motor 3, the diameter of the output shaft 1 of the first connecting part 11 is larger than the diameter of the second connecting part 12. The material of the transmission gear 2 is often different from that of the output shaft 1. The material of the transmission gear 2 has a larger coefficient of thermal expansion. The material of the transmission gear 2 is generally carbon steel, while the material of the output shaft 1 is generally cast iron. When the motor 3 operates in an environment higher than normal temperature (normal temperature is 40 degrees Celsius-80 degrees Celsius), the deformation of the transmission gear 2 is large. Therefore, the distance between the output shaft 1 of the motor 3 and the transmission gear 2 will decrease. Connecting the transmission gear 2 to the first connecting part 11 of the output shaft 1 ensures that the transmission gear 2 is initially engaged with the larger diameter part of the output shaft 1, reducing the probability of the transmission gear 2 damaging the output shaft 1.

[0038] When motor 3 operates in an environment below normal temperature, the output shaft 1 and transmission gear 2 of motor 3 are affected by the temperature drop. Both transmission gear 2 and output shaft 1 contract. As the outer peripheral wall of transmission gear 2 contracts inward and the inner peripheral wall contracts outward, the gap between output shaft 1 and transmission gear 2 increases. The second connecting part 12 connects transmission gear 2 and output shaft 1. The shaft diameter at the connection point between output shaft 1 and transmission gear 2 is small, allowing transmission gear 2 to fit tightly with output shaft 1 in an environment below normal temperature. When the temperature of motor 3 rises due to operation in an environment below normal temperature, transmission gear 2 and output shaft 1 of motor 3 expand. The gap between transmission gear 2 and output shaft 1 of motor 3 decreases, and transmission gear 2 fits even more tightly with output shaft 1 of motor 3, increasing the power transmission efficiency of motor 1.

[0039] Reference Figure 1 and Figure 2 The second connecting part 12 of the output shaft 1 is provided with an abutment mechanism 5 at one end near the motor 3. The abutment mechanism 5 is fixedly connected to the peripheral wall of the output shaft 1, and the end of the abutment mechanism 5 away from the motor 3 abuts against the side of the transmission gear 2 near the motor 3. By pressing the transmission gear 2 together with the abutment mechanism 5, the transmission gear 2 is tightly fitted with the output shaft 1, reducing the gap between the transmission gear 2 and the peripheral wall of the output shaft 1, and increasing the power transmission efficiency between the output shaft 1 and the transmission gear 2.

[0040] Reference Figure 2 The abutting mechanism 5 includes a connecting seat 51, an elastic element 53, and an abutting ring 52. One end of the connecting seat 51 is fixedly connected to the peripheral wall of the output shaft 1, and the other end of the connecting seat 51 is fixedly connected to the end of the elastic element 53 near the motor 3. The end of the elastic element 53 away from the motor 3 is fixedly connected to the abutting ring 52. The side of the abutting ring 52 away from the motor 3 abuts against the side of the transmission gear 2 near the motor 3.

[0041] By fixing the connecting seat 51 to the output shaft 1, the connecting seat 51 and the output shaft 1 rotate synchronously, reducing the friction between the abutment mechanism 5 and the transmission gear 2. The elastic element 53, preferably an elastic ring plate, facilitates the connection between the abutment ring 52 and the connecting seat 51. The abutment ring 52 presses against the transmission gear 2, making the connection between the transmission gear 2 and the output shaft 1 tighter, increasing the power transmission efficiency of the output shaft 1. When the operating temperature of the motor 3 decreases, causing the gap between the transmission gear 2 and the output shaft 1 to increase, the elastic element 53 presses against the transmission gear 2, causing the transmission gear 2 to move away from the motor 3 or for the side of the transmission gear 2 away from the motor 3 to press against the second transmission surface 42, reducing the impact of temperature changes on the power transmission efficiency of the motor 3.

[0042] Reference Figure 1 and Figure 2 The assembly method of a motor shaft gear connection structure is as follows: First, connect the smaller diameter end of the output shaft 1 to the motor 3; heat the transmission gear 2; enlarge the inner diameter of the transmission gear 2 and pass it through the larger diameter end of the output shaft 1. When the operating environment of the motor 3 is below room temperature, cooling the transmission gear 2 causes it to connect to the second connecting part 12 of the output shaft 1. When the operating environment of the motor 3 is above room temperature, cooling the transmission gear 2 causes it to connect to the first connecting part 11 of the motor 3.

[0043] In environments above room temperature, both the output shaft 1 and the transmission gear 2 of the motor 3 expand, reducing the distance between them. When the transmission gear 2 is connected to the first connecting part 11, the larger diameter of the output shaft 1 at the first connecting part 11 prevents the transmission gear 2 from damaging it. In environments below room temperature, both the output shaft 1 and the transmission gear 2 contract, increasing the distance between them and allowing for a tighter connection. When the transmission gear 2 is connected to the second connecting part 12 of the output shaft 1, as the motor 3 cools down, the transmission gear 2 remains tightly connected to the output shaft 1 under the action of the clamping mechanism, reducing the impact of temperature changes on the power output efficiency of the motor 3.

[0044] The implementation principle of the motor shaft gear connection structure in this application embodiment is as follows: the side wall of the output shaft 1 of the motor 3 is inclined from the direction away from the motor 3 to the direction away from the axis of the output shaft 1, which increases the connection area between the transmission gear 2 and the output shaft 1, and avoids stress concentration on the output shaft 1 of the motor 3. By setting the first transmission surface 41 and the second transmission surface 42 on the output shaft 1, the connection area between the output shaft 1 and the transmission gear 2 is further increased, and the reaction force of the transmission gear 2 on the output shaft 1 is dispersed, so that the transmission gear 2 and the output shaft 1 are connected more tightly, avoiding stress concentration on the output shaft 1 of the motor 3 and reducing the probability of stress damage to the output shaft 1 of the motor 3.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A motor shaft gear connection structure, characterized in that: The device includes an output shaft (1) and a transmission gear (2). One end of the output shaft (1) is used to connect to a motor (3). The shaft diameter of the output shaft (1) gradually decreases in the direction away from the motor (3) and towards the motor (3). The peripheral wall of the other end of the output shaft (1) is connected to the inner diameter of the transmission gear (2). The meshing point of the transmission gear (2) and the output shaft (1) is arranged at an angle. The peripheral wall of the output shaft (1) is provided with a first connecting part (11) and a second connecting part (12). The first connecting part (11) is located on the side of the second connecting part (12) away from the motor (3). Both the first connecting part (11) and the second connecting part (12) are provided with a connecting mechanism (4) for connecting the transmission gear (2). The connecting mechanism (4) is used to drive the transmission gear (2) to rotate synchronously with the output shaft (1). The connecting mechanism (4) includes a first transmission surface (41). A first transmission tooth (411) is provided on a transmission surface (41), the first transmission tooth (411) is arranged along the axial direction of the output shaft (1), and a first mating tooth (21) is provided on the inner diameter peripheral wall of the transmission gear (2) to cooperate with the first transmission tooth (411); the connecting mechanism (4) further includes a second transmission surface (42), a second transmission tooth (421) is provided on the second transmission surface (42), the second transmission tooth (421) is arranged along the radial direction of the output shaft (1), and a second mating tooth (22) is provided on the peripheral wall of the transmission gear (2) away from the motor (3) to cooperate with the second transmission tooth (421); the first transmission surface (41) of the connecting mechanism (4) on the second connecting part (12) is connected to the end of the second transmission surface (42) of the connecting mechanism (4) on the second connecting part (12) away from the axis of the output shaft (1).

2. The motor shaft gear connection structure according to claim 1, characterized in that: The transmission gear (2) is provided with an abutment mechanism (5) on the side facing the motor (3). The abutment mechanism (5) is fixedly connected to the output shaft (1) and is used to press the transmission gear (2) against the peripheral wall of the output shaft (1).

3. The motor shaft gear connection structure according to claim 2, characterized in that: The abutting mechanism (5) includes a connecting seat (51), an abutting ring (52), and an elastic element (53). The connecting seat (51) is fixedly connected to the peripheral wall of the output shaft (1). The abutting ring (52) coaxially abuts against the side of the transmission gear (2) near the motor (3). The side of the abutting ring (52) away from the transmission gear (2) is connected to one end of the elastic element (53). The other end of the elastic element (53) is connected to the connecting seat (51).

4. An assembly method for a motor shaft gear connection structure, wherein the motor shaft gear connection structure according to any one of claims 1-3 is characterized in that: Connect the smaller end of the output shaft (1) to the motor (3); heat the transmission gear (2); pass the inner diameter of the transmission gear (2) through the larger end of the output shaft (1); cool the transmission gear (2) so that the inner diameter of the transmission gear (2) abuts against the peripheral wall of the output shaft (1).

5. The assembly method of the motor shaft gear connection structure according to claim 4, characterized in that: The output shaft (1) is provided with a first connecting part (11) on its peripheral wall. The first connecting part (11) is located at the end of the output shaft (1) away from the motor (3). When the motor (3) is working in an environment with a temperature higher than normal, the inner diameter peripheral wall of the transmission gear (2) is connected to the first connecting part (11) of the output shaft (1).

6. The assembly method of the motor shaft gear connection structure according to claim 4, characterized in that: The output shaft (1) is provided with a second connecting part (12) on its peripheral wall. The second connecting part (12) is located at the end of the output shaft (1) near the motor (3). When the motor (3) is working in an environment below normal temperature, the inner diameter peripheral wall of the transmission gear (2) is connected to the second connecting part (12) of the output shaft (1).

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