Motor shaft, motor rotor and motor

Abstract

The utility model discloses a motor shaft, a motor rotor and a motor, the motor shaft is arranged in a motor shaft connecting hole of the motor rotor in a penetrating manner, and the motor shaft and the motor rotor are coaxially and fixedly connected; the motor shaft is of a torsion rod spring type structure. The motor shaft adopts a torsion bar spring type structure to replace a rigid spline shaft of a traditional motor, and the torsion bar spring has buffering and shock absorption effects, so that the fatigue fracture period of the motor shaft in long-term operation is effectively prolonged, and the service life is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a motor shaft, a motor rotor and a motor. Background Art

[0002] The motor shaft of a traditional motor generally uses a rigid spline shaft with an interference fit with the rotor, and is supported by front and rear bearings to achieve the function of transmitting torque. The spline shaft is a stepped shaft, which is simple to process and assemble, but the stepped shaft is prone to stress concentration at the root, which is prone to fatigue fracture under different shaft torques and complex working conditions during operation, short life, and poor vibration bearing capacity.

[0003] Therefore, there is an urgent need to provide a motor shaft, a motor rotor and a motor to solve the above-mentioned technical problems. Utility Model Content

[0004] The utility model provides a motor shaft, a motor rotor and a motor. The motor shaft adopts a torsion bar spring structure to replace the rigid spline shaft of a traditional motor. The torsion bar spring has a buffering and shock absorbing effect, which effectively prolongs the fatigue fracture cycle of the motor shaft during long-term operation and improves its service life.

[0005] According to some embodiments, the utility model provides a motor shaft, including: the motor shaft is used to pass through the motor shaft connecting hole of the motor rotor, and the two are coaxially fixedly connected; wherein the motor shaft is a torsion bar spring structure.

[0006] Optionally, the motor shaft comprises an output section, an auxiliary positioning section, an elastic deformation section and an input section, and the output section, the auxiliary positioning section, the elastic deformation section and the input section are coaxially connected in sequence.

[0007] Optionally, the auxiliary positioning section is located between the output section and the elastic deformation section; the front end of the auxiliary positioning section is connected to the rear end of the output section through a first circular arc section; the rear end of the auxiliary positioning section is connected to the front end of the elastic deformation section through a second circular arc section.

[0008] Optionally, the elastic deformation section is located between the auxiliary positioning section and the input section; and the rear end of the elastic deformation section is connected to the front end of the input section via a third circular arc section.

[0009] Optionally, an outer diameter of the elastic deformation section is smaller than outer diameters of the auxiliary positioning section and the input section.

[0010] Optionally, the motor shaft is a stepped shaft as a whole.

[0011] Optionally, a circle of first key grooves is circumferentially provided on the outer circumferential wall of the output section, and the first key grooves extend along the axial direction of the output section; a circle of second key grooves is circumferentially provided on the outer circumferential wall of the input section, and the second key grooves extend along the axial direction of the input section.

[0012] According to some embodiments, the utility model also provides a motor rotor, comprising: a rotating bracket and the motor shaft, the motor shaft connecting hole being provided on the rotor bracket, the input section of the motor shaft extending into the end of the motor shaft connecting hole and being coaxially fixedly connected with the rotor bracket; and the auxiliary positioning section extending into the head end of the motor shaft connecting hole and rotatingly cooperating with the rotor bracket.

[0013] Optionally, a gap is left between the outer circumferential wall of the elastic deformation section and the inner circumferential wall of the motor shaft connecting hole.

[0014] According to some embodiments, the utility model further provides a motor, comprising the motor rotor.

[0015] Beneficial effects:

[0016] 1. The motor shaft in the utility model adopts a torsion bar spring structure to replace the rigid spline shaft of the traditional motor. The torsion bar spring has a buffering and shock absorbing effect, which can effectively extend the fatigue fracture cycle of the motor shaft during long-term operation, greatly reduce the risk of motor shaft fracture, and then achieve the effect of improving and extending the service life of the motor shaft;

[0017] 2. The motor shaft with torsion bar spring structure has the characteristics of compact structure, buffering and vibration absorption, thereby improving service life, etc., which can realize the overall lightweight and long service life of the power generation unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the conventional technology, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 is a schematic diagram of the structure of the motor shaft in this embodiment;

[0020] Figure 2 It is a cross-sectional schematic diagram of the assembly of the motor shaft and the rotor bracket in this embodiment.

[0021] Figure numerals: 1, motor shaft, 11, output section; 111, first keyway; 12, auxiliary positioning section; 13, elastic deformation section; 14, input section; 141, second keyway; 15, first circular arc section; 16, second circular arc section; 17, third circular arc section; 2, rotor bracket; 21, motor shaft connecting hole. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings. However, it can be understood by those skilled in the art that in each embodiment of the utility model, many technical details are proposed in order to enable readers to better understand the utility model. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed for protection of the utility model can also be implemented. The division of the following embodiments is for the convenience of description and should not constitute any limitation on the specific implementation of the utility model. The various embodiments can be combined and referenced with each other without contradiction.

[0023] The following is a detailed description of a motor shaft provided in this embodiment in conjunction with the accompanying drawings. Figure 1 , Figure 2 As shown, the motor shaft 1 is used to pass through the motor shaft connecting hole 21 of the motor rotor, and the two are coaxially fixedly connected; wherein the motor shaft 1 is a torsion bar spring structure.

[0024] The motor shaft 1 in this embodiment adopts a torsion bar spring structure to replace the rigid spline shaft of the traditional motor. The torsion bar spring can utilize the buffering and shock-absorbing effects to effectively extend the long-term fatigue fracture cycle of the motor shaft and greatly reduce the risk of motor shaft fracture. At the same time, it has buffering and vibration absorption functions to improve the vibration bearing capacity.

[0025] Please refer to Figure 1 As shown, in this embodiment, it should be noted that the motor shaft 1 is a stepped shaft as a whole, which is processed by diameter reduction and adopts a smooth transition fillet process, and specifically includes an output section 11, an auxiliary positioning section 12, an elastic deformation section 13 and an input section 14, and the output section 11, the auxiliary positioning section 12, the elastic deformation section 13 and the input section 14 are coaxially connected in sequence. Among them, the input section 14 is used to extend into the motor shaft connection hole 21, and can rely on its own rigidity to be coaxially connected with the motor rotor for torque transmission; the elastic deformation section 13 is used to produce elastic deformation when the motor shaft 1 is subjected to a large force, so as to absorb most of the impact force; the auxiliary positioning section 12 is used to cooperate with the motor rotor in rotation; the output section 11 is used to output power when the motor rotor rotates.

[0026] In an example, the auxiliary positioning segment 12 is located between the output segment 11 and the elastic deformation segment 13, the end of the auxiliary positioning segment 12 close to the output segment 11 is the front end, and the other end is the rear end, the front end of the auxiliary positioning segment 12 is connected to the rear end of the output segment 11 through the first circular arc segment 15, and the rear end of the auxiliary positioning segment 12 is connected to the front end of the elastic deformation segment 13 through the second circular arc segment 16.

[0027] The elastic deformation section 13 is located between the auxiliary positioning section 12 and the input section 14, and the outer diameter of the elastic deformation section 13 is smaller than the outer diameters of the auxiliary positioning section 12 and the input section 14. The end of the elastic deformation section 13 close to the auxiliary positioning section 12 is the front end, and the other end is the rear end. The rear end of the elastic deformation section 13 is connected to the front end of the input section 14 through the third arc section 17.

[0028] In this embodiment, it should be noted that a circle of first key grooves 111 are circumferentially arranged on the outer peripheral wall of the output section 11, and the first key grooves 111 are extended along the axial direction of the output section 11. The output section 11 can be key-connected with external components through the first key grooves 111. Preferably, the front end of the output section 11 is also chamfered.

[0029] The outer wall of the input section 14 is circumferentially provided with a circle of second key grooves 141 , which extend along the axial direction of the input section 14 . The second key grooves 141 can realize key connection between the input section 14 and the motor shaft connecting hole 21 of the motor rotor.

[0030] This embodiment also provides a motor rotor, referring to Figure 2 As shown, it includes: a rotating bracket 2 and the above-mentioned motor shaft 1, wherein the motor shaft connecting hole 21 is provided on the rotor bracket 2, and the input section 14 of the motor shaft 1 extends into the end of the motor shaft connecting hole 21 and is coaxially fixedly connected with the rotor bracket 2. It can be understood that the outer peripheral wall of the input section 14 and the inner peripheral wall of the motor shaft connecting hole 21 are interference-fitted to achieve coaxial fixed connection. At the same time, the auxiliary positioning section 12 of the motor shaft 1 is located in the head end of the motor shaft connecting hole 21 and the outer peripheral wall of the auxiliary positioning section 12 and the inner peripheral wall of the motor shaft connecting hole 21 are rotationally matched to achieve auxiliary positioning. The elastic deformation section 13 is located in the middle position of the motor shaft connecting hole 21 and a gap is left between the outer peripheral wall and the inner peripheral wall of the motor shaft connecting hole 21, so that the elastic deformation section 13 is easy to be elastically deformed under force.

[0031] This embodiment also provides a motor, including the above-mentioned motor rotor.

[0032] The motor in this embodiment, as a power device, can be applied in a variety of scenarios. For example, in the field of starter motors, in order to start an engine (such as a diesel engine for a work machine or other vehicle), it is usually necessary to provide a mechanical input to start the rotation of the crankshaft so that the piston connected to the crankshaft reciprocates, which may require a large torque. It is known that during the start-up, a starter motor powered by the battery of the vehicle is used to start the rotation of the crankshaft. Once the engine has started, the engine is used to provide power and the vehicle battery is charged by using the motor as a generator. The crankshaft vibration is absorbed by adding a torsional damper between the traditional motor and the engine, but the torsional damper has the disadvantages of being heavy and occupying space. By using the motor shaft with a torsion bar spring structure in this embodiment, the non-concentric torsional vibration and yaw generated between the motor rotor and the crankshaft of the engine can be effectively absorbed during the process of the motor shaft transmitting torque. At the same time, the motor shaft with a torsion bar spring structure has a compact structure, buffering and vibration absorption, and can achieve the functions of overall lightweight and long life of the power generation unit.

[0033] Of course, it can also be used in other fields, and this embodiment does not impose any specific limitation.

[0034] Principle of the embodiment: When the motor shaft 1 is subjected to a large force, the position where the auxiliary positioning section 12 of the motor shaft 1 contacts the motor shaft connecting hole 21 is Figure 2 The position a in the input section 14 and the motor shaft connection hole 21 contact the position, that is, Figure 2 At position b in the figure, there will be an angle deviation between the two during the torque transmission process. At this time, the elastic deformation section 13 of the motor shaft 1 will produce elastic deformation, and then rotate a certain angle relative to the rotor bracket 2 to absorb most of the impact force and prevent the motor shaft 1 from breaking due to the motor shaft 1 instantly bearing a large torque force reaching the yield strength of the shaft.

[0035] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the scope of protection of the present invention. In addition, the claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims or the equivalent forms of such scope and boundaries.

Claims

1. A motor shaft, characterized in that: include: The motor shaft (1) is used to be inserted into the motor shaft connection hole (21) of the motor rotor, and the two are coaxially fixedly connected; wherein the motor shaft (1) is a torsion bar spring structure; The motor shaft (1) comprises an output section (11), an auxiliary positioning section (12), an elastic deformation section (13) and an input section (14); the output section (11), the auxiliary positioning section (12), the elastic deformation section (13) and the input section (14) are coaxially connected in sequence.

2. The motor shaft according to claim 1, characterized in that: The auxiliary positioning section (12) is located between the output section (11) and the elastic deformation section (13); The front end of the auxiliary positioning section (12) is connected to the rear end of the output section (11) via a first arc section (15); The rear end of the auxiliary positioning section (12) is connected to the front end of the elastic deformation section (13) via a second circular arc section (16).

3. The motor shaft according to claim 2, characterized in that: The elastic deformation section (13) is located between the auxiliary positioning section (12) and the input section (14); The rear end of the elastic deformation section (13) is connected to the front end of the input section (14) via a third circular arc section (17).

4. The motor shaft according to claim 3, characterized in that: The outer diameter of the elastic deformation section (13) is smaller than the outer diameters of the auxiliary positioning section (12) and the input section (14).

5. The motor shaft according to claim 4, characterized in that: The motor shaft (1) is a stepped shaft as a whole.

6. The motor shaft according to claim 1, characterized in that: A circle of first key grooves (111) is circumferentially provided on the outer peripheral wall of the output section (11), and the first key grooves (111) extend along the axial direction of the output section (11); A circle of second key grooves (141) is circumferentially provided on the outer peripheral wall of the input section (14), and the second key grooves (141) extend along the axial direction of the input section (14).

7. A motor rotor, characterized in that: include: A rotor bracket (2) and a motor shaft (1) as described in any one of claims 1 to 6, wherein the motor shaft connecting hole (21) is provided on the rotor bracket (2), and the input section (14) of the motor shaft (1) extends into the end of the motor shaft connecting hole (21) and is coaxially fixedly connected to the rotor bracket (2); the auxiliary positioning section (12) extends into the head end of the motor shaft connecting hole (21) and is rotationally matched with the rotor bracket (2).

8. The motor rotor according to claim 7, characterized in that: A gap is left between the outer peripheral wall of the elastic deformation section (13) and the inner peripheral wall of the motor shaft connecting hole (21).

9. A motor, characterized in that: Comprising the motor rotor as claimed in claim 8.

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