Transmission structure for improving stability of wave spring

Abstract

The utility model relates to the technical field of transmissions, in particular to a transmission structure capable of improving the stability of a wave spring, which comprises a front shell, a rear shell and a rear shell, a rear bearing position is formed on the rear shell, the rear shell is connected and fastened with the front shell, and a mounting cavity is formed in the rear shell; wherein a front bearing is arranged on the inner side of the front bearing position, a rear bearing is arranged in the rear bearing position, and a rotor shaft is connected between the front bearing and the rear bearing in a penetrating manner; the wave-shaped spring and the rear bearing position are located in different hole positions, impact force of a motor shaft acts on the gasket during working, so that the wave-shaped spring cannot be flattened, reliability is greatly improved, the working height of the wave-shaped spring is controlled by the gasket, and due to the fact that the gasket can only move in the rear bearing position, reliability is greatly improved. Therefore, the working height range of the wave spring is small, the force value fluctuation is small, and the displacement of the rotor shaft of the motor is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission structures, and in particular to a transmission structure capable of improving the stability of a wave spring. Background Art

[0002] Hybrid transmissions play an important role in today's automotive industry. In these transmissions, the performance and durability of the motor are key factors, especially the NVH (noise, vibration and harshness) performance of the motor bearings, which directly affects the performance of the entire system and the driving experience.

[0003] In order to improve the NVH performance of the motor bearing, in existing hybrid transmission designs, a wave spring is usually added between one side of the motor bearing and its housing. This wave spring helps to reduce the vibration and noise of the bearing by providing axial preload, as shown in the figure in the specification. Figure 1 As shown, the motor rotor shaft 4 is connected to the rear housing 2 and the front housing 6 through the rear bearing 3 and the front bearing 5 respectively. The axial preload of the two bearings is generated by compressing the wave spring 1 arranged between the rear housing 2 and the rear bearing 3. In this way, the force generated by the deformation of the wave spring 1 is transmitted to the front bearing 5 through the motor rotor shaft 4.

[0004] The design of the wave spring follows Hooke's law (F = k(x-x0)), where the elastic force F varies with the working height x. To obtain the specified force value, x needs to be controlled within a certain range. However, when the acceleration impact is large, the wave spring is completely flattened after being subjected to the force. The wave spring cannot be at the specified working height, resulting in excessive movement of the motor rotor shaft, causing the axial overlap of the motor stator and rotor to decrease, and the motor performance to degrade. Secondly, when the acceleration impact is large and the frequency is high, the wave spring is completely flattened after being subjected to the force, and the high-frequency reciprocating flattening causes a sharp decline in the reliability of the wave spring, resulting in breakage in existing tests. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art that the wave spring is completely flattened or damaged after being stressed when the acceleration impact is large, and to propose a transmission structure that improves the stability of the wave spring.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A transmission structure is designed to improve the stability of a wave spring, including:

[0008] A front housing formed with a front bearing seat;

[0009] and a rear housing formed with a rear bearing seat, wherein the rear housing is fastened to the front housing and forms a mounting cavity therein;

[0010] A front bearing is placed inside the front bearing position, a rear bearing is placed inside the rear bearing position, and a rotor shaft is connected between the front bearing and the rear bearing;

[0011] A step groove is also formed on the inner side of the rear bearing position, and a wave spring is placed in the step groove.

[0012] Furthermore, the rear bearing position includes a first groove and a second groove in a stepped structure, and a chamfered portion is formed between the first groove and the second groove.

[0013] Furthermore, the step groove is formed at the chamfered portion, and the step groove coincides with the center of the rear bearing position.

[0014] Furthermore, a force reducing member is placed in the first groove.

[0015] Furthermore, the force reducing member is a gasket, which is placed in the rear bearing position and contacts the side of the rear bearing.

[0016] Furthermore, necks are formed at both ends of the rotor shaft, and the two necks are respectively connected to the front bearing and the rear bearing.

[0017] The utility model proposes a transmission structure for improving the stability of the wave spring, and its beneficial effects are: in the utility model, the wave spring and the rear bearing position are in different hole positions, and the impact force of the motor shaft acts on the gasket during operation, so the wave spring will not be flattened, and the reliability is greatly improved. Secondly, the working height of the wave spring is controlled by the gasket. Since the gasket can only move in the rear bearing position, the working height range of the wave spring is small and the force value fluctuation is small. In addition, the amount of movement of the motor's rotor shaft is reduced, so the length of the stator covering can be shortened, thereby achieving the purpose of reducing material usage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of a conventional transmission;

[0019] Figure 2 This is a schematic diagram of the transmission structure of the present utility model;

[0020] Figure 3 This is a schematic diagram of the step trough structure of the utility model;

[0021] Figure 4 This is a schematic diagram of the rear bearing structure of the present utility model.

[0022] In the figure: 1. Front housing; 11. Front bearing position; 2. Rear housing; 21. Rear bearing position; 211. First groove; 212. Second groove; 213. Chamfered portion; 22. Step groove; 23. Force reducing member; 3. Mounting cavity; 4. Front bearing; 5. Rear bearing; 6. Rotor shaft; 61. Neck; 7. Wave spring. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Reference Figure 2-4 This is an embodiment of the present invention, which discloses a transmission structure that improves the stability of a wave spring. It is used to solve the problems of excessive fluctuations in the working height of the wave spring 7 in the current transmission under impact conditions, and the wave spring 7 is easily flattened under impact conditions, resulting in a sharp decline in reliability and failure to meet usage requirements. Specifically, the transmission structure includes a front housing 1 having a front bearing seat 11 formed thereon. The front bearing seat 11 is formed on the inner side surface of the front housing 1;

[0025] and a rear housing 2 having a rear bearing seat 21 formed thereon. Similarly, the rear bearing seat 21 is formed on the inner side of the rear housing 2. The front bearing seat 11 is arranged opposite to the rear bearing seat 21. The rear housing 2 is fastened to the front housing 1 and a mounting cavity 3 is formed therein. The front housing 1 and the rear housing 2 can be connected by fasteners such as bolts. This method is a conventional method used by those skilled in the art and will not be elaborated on herein.

[0026] The front bearing 4 is placed inside the front bearing position 11, the rear bearing 5 is placed inside the rear bearing position 21, and the rotor shaft 6 is connected between the front bearing 4 and the rear bearing 5;

[0027] A step groove 22 is formed on the inner side of the rear bearing position 21 , and a wave spring 7 is placed in the step groove 22 .

[0028] In some embodiments, the rear bearing position 21 in the present invention includes a first groove 211 and a second groove 212 in a step structure, and a chamfered portion 213 is formed between the first groove 211 and the second groove 212, wherein the depth of the second groove 212 is greater than that of the first groove 211. Of course, the centers of the first groove 211 and the second groove 212 also coincide.

[0029] On the basis of the above embodiment, the step groove 22 in this embodiment is formed at the chamfered portion 213 , and the step groove 22 coincides with the center of the rear bearing position 21 .

[0030] In addition, in the present invention, a force reducing member 23 is placed in the first groove 211 . Preferably, the force reducing member 23 is a gasket, which is placed in the rear bearing position 21 and contacts the side of the rear bearing 5 .

[0031] That is, in this embodiment, the wave spring 7 and the rear bearing position 21 are in different hole positions. During operation, the impact force of the motor shaft acts on the gasket, so the wave spring 7 will not be flattened, and the reliability is greatly improved. Secondly, the working height of the wave spring 7 is controlled by the gasket. Since the gasket can only move in the rear bearing position 21, the working height range of the wave spring 7 is small and the force value fluctuation is small. In addition, the movement of the motor's rotor shaft 6 is reduced, so the length of the stator covering can be shortened, thereby achieving the purpose of reducing material usage.

[0032] It should be noted that, in this embodiment, necks 61 are formed at both ends of the rotor shaft 6, and the two necks 61 are respectively connected to the front bearing 4 and the rear bearing 5, that is, in this embodiment, the necks 61 are connected to the inner rings of the front bearing 4 and the rear bearing 5 to achieve the purpose of rotation.

[0033] In summary, the present invention adds a step groove 22 under the hole of the rear bearing position 21 of the rear housing 2, installs the wave spring 7 and the rear bearing 5 in holes of different diameters, and adds a gasket between the rear housing 2 and the rear bearing 5, so that the gasket can withstand the axial impact force of the motor shaft system, thereby protecting the wave spring 7.

[0034] The working height of the wave spring 7 is controlled by the height of the step groove 22 and the play of the shaft system. The play of the shaft system is obtained by measuring the distance between the rear bearing position 21 of the rear housing 2 and the front bearing position 11 of the front housing 1, subtracting the total length from the rear bearing 5 through the rotor shaft 6 to the front bearing 4, and using a gasket to obtain the required play. The axial play of the motor shaft is effectively reduced by adopting the new solution, and the motor stator material is effectively saved. The strength of the wave spring 7 after the vibration test is significantly improved.

[0035] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A transmission structure for improving the stability of a wave spring, characterized in that: include: A front housing (1) is formed with a front bearing seat (11); and a rear housing (2) formed with a rear bearing seat (21), wherein the rear housing (2) is connected and fastened to the front housing (1) and forms a mounting cavity (3) therein; A front bearing (4) is placed inside the front bearing position (11), a rear bearing (5) is placed inside the rear bearing position (21), and a rotor shaft (6) is connected between the front bearing (4) and the rear bearing (5); A step groove (22) is also formed on the inner side of the rear bearing position (21), and a wave spring (7) is placed in the step groove (22).

2. A transmission structure for improving the stability of a wave spring according to claim 1, characterized in that: The rear bearing position (21) comprises a first groove (211) and a second groove (212) in a step structure, and a chamfered portion (213) is formed between the first groove (211) and the second groove (212).

3. The transmission structure for improving the stability of a wave spring according to claim 2, characterized in that: The step groove (22) is formed at the chamfered portion (213), and the step groove (22) coincides with the center of the rear bearing position (21).

4. The transmission structure for improving the stability of a wave spring according to claim 2, characterized in that: A force reducing member (23) is also placed in the first groove (211).

5. The transmission structure for improving the stability of a wave spring according to claim 4, characterized in that: The force reducing member (23) is a gasket, which is placed in the rear bearing position (21) and contacts the side of the rear bearing (5).

6. A transmission structure for improving the stability of a wave spring according to any one of claims 1 to 5, characterized in that: Necks (61) are formed at both ends of the rotor shaft (6), and the two necks (61) are connected to the front bearing (4) and the rear bearing (5) respectively.

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