A power transmission device and a power system

Abstract

The utility model relates to a kind of power transmission device and power system, and power transmission device includes transmission shaft and transmission gear and vibration reduction assembly, the vibration reduction assembly is axially fixed connection with the transmission gear by first connecting member, and it is fixed connection with the transmission shaft circumferentially by second connecting member, the vibration reduction assembly includes first plate, second plate and third plate, at least one elastic member with elasticity in the circumferential direction is arranged in the first plate, second plate and third plate, axial limiting component is arranged on the transmission shaft, the axial limiting component is located at the side of the transmission gear away from the vibration reduction assembly.Power transmission device can effectively reduce the transmission between transmission gear and transmission shaft by vibration reduction assembly, thereby protecting other components in power system.

Description

Technical Field

[0001] This utility model belongs to the field of power and transmission technology, specifically relating to a power transmission device and a power system. Background Technology

[0002] A power transmission device is a mechanical device used to transmit power from a power source such as an engine or electric motor to an actuator such as wheels or working parts. Power transmission devices include three types: mechanical, electric, and hydraulic. Mechanical power transmission devices specifically employ methods such as gear transmission, belt transmission, chain transmission, and friction transmission. Gear transmission is the most common type of mechanical power transmission device and is used in many applications. For example, in a vehicle's transmission, gear pairs are used as the gear transmission stages. However, during vehicle operation, vibrations caused by vehicle movement or transmission operation are transmitted to the gear pairs, and subsequently to mechanisms connected to them, such as shifting mechanisms. Similarly, in electric pump assemblies, to ensure the pump's output power meets requirements, a gear transmission is installed after the pump's output shaft, thereby changing the pump's output torque and speed. Likewise, in electric pump applications, vibrations caused by various factors are also transmitted to the pump itself via gear transmissions.

[0003] For structures such as gear shifting mechanisms and electric pumps, which are inherently precision components, prolonged or large-amplitude vibrations can easily affect their structure, thereby reducing their service life and operational accuracy. Therefore, it is necessary to develop a power transmission device that reduces the impact of vibration on the precision mechanisms directly connected to the power transmission device. Utility Model Content

[0004] Therefore, the present invention aims to provide a power transmission device and a power system including the same, which can effectively reduce the transmission of vibration between the transmission gear and the transmission shaft through the vibration damping component, thereby protecting other components in the power system.

[0005] A power transmission device includes a drive shaft and a drive gear. The power transmission device further includes a vibration damping component. The vibration damping component is axially fixedly connected to the drive gear via a first connecting member and circumferentially fixedly connected to the drive shaft via a second connecting member. The vibration damping component includes a first plate, a second plate, and a third plate. At least one elastic element with circumferential elasticity is provided in the first plate, the second plate, and the third plate. An axial limiting member is provided on the drive shaft. The axial limiting member is located on the side of the drive gear away from the vibration damping component.

[0006] In one alternative implementation, the elastic element is a helical spring.

[0007] In one alternative implementation, the number of helical springs is three.

[0008] In an optional embodiment, the first plate, the second plate, and the third plate are arranged sequentially in the axial direction, and the first plate, the second plate, and the third plate have the same outer diameter.

[0009] In an optional embodiment, the inner diameters of the first plate and the third plate are larger than the inner diameter of the second plate, and the second connecting member is disposed on the inner wall of the second plate, wherein the second connecting member is a spline.

[0010] In one optional embodiment, the transmission gear has a protruding block, the first plate has a first through hole, the second plate has a second through hole, and the third plate has a third through hole. The protruding block and the first through hole are circumferentially fixedly connected to the transmission gear and the first plate by form fit.

[0011] In an optional implementation, the first connecting member is a pin.

[0012] This utility model also proposes a power system, including a power source, and the power system further includes the power transmission device.

[0013] In one alternative implementation, the power source is a motor or an electric pump, and the drive shaft is fixedly connected to the output shaft of the power source.

[0014] In one alternative embodiment, the power system includes a shift fork and a synchronizing mechanism, wherein the shift fork is connected to the synchronizing mechanism, and the synchronizing mechanism is capable of being connected to the transmission gear.

[0015] The detailed features of this utility model and the resulting technical effects will be described in detail below with reference to the accompanying drawings. Attached Figure Description

[0016] Exemplary embodiments of the present invention are described with reference to the accompanying drawings, wherein: Figure 1 A cross-sectional schematic diagram of the power transmission device of this utility model is shown.

[0017] Figure 2 A perspective view of the power transmission device of this utility model is shown from one angle.

[0018] Figure 3 The diagram shows a cross-sectional view of the power transmission device of this invention after the drive shaft has been removed.

[0019] Figure 4 An exploded schematic diagram of the power transmission device of this utility model is shown. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, and "several" means one or more. Furthermore, unless otherwise stated, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Additionally, for clarity, descriptions of orientation that may be used in the following description, such as "upper," "lower," "inner," "outer," "radial," and "axial," are not intended to limit the technical solution of the utility model unless explicitly stated.

[0022] See Figure 1 The diagram shows a cross-sectional view of the power transmission device of this invention. The power transmission device includes a vibration damping component 1, a drive shaft 2, an axial limiting element 3, and a transmission gear 4. In existing power transmission devices, gears are often directly connected to the drive shaft via splines or bearings, resulting in a direct connection and direct transmission of vibration between them. To reduce vibration transmission, the transmission gear 4 is no longer directly connected to the drive shaft 2, but rather via the vibration damping component 1. Therefore, regardless of whether the vibration originates from the drive shaft 2 or the transmission gear 4, it is reduced or even eliminated to some extent by the vibration damping component 1 before being transmitted to the other of the two components. As a beneficial consequence, the vibration experienced by other components connected to the power transmission device, such as the shifting mechanism and the electric pump, is also reduced or eliminated, thereby mitigating the adverse effects on their operating performance and service life.

[0023] See Figure 2The diagram shows a perspective view of the power transmission device of this invention from one angle. The power transmission device can be applied to the power transmission of electric pumps. For example, the drive shaft 2 can be connected to the output shaft of the electric pump via a spline, or teeth can be provided on the outer surface of the drive shaft 2 to mesh with gears fixed on the output shaft of the electric pump, thereby transmitting the power of the electric pump. Of course, the power transmission device can also be used to transmit the rotational power of a motor. For components such as electric pumps and motors, because they contain electronic devices or are connected to electronic devices such as controllers, the stability of the operating environment is crucial. Using the power transmission device of this invention can effectively reduce vibration transmission and provide effective vibration shielding for the electric pump or motor.

[0024] On the other hand, the power transmission device can also be applied to a transmission. To change gears, a transmission includes a shifting mechanism, which is typically driven by a drive motor that powers a worm gear, worm wheel, or ball screw, converting the rotational motion of the drive motor into the linear movement of a shift fork. The shift fork then engages a transmission mechanism such as a synchronizer, connecting the corresponding gear to the shaft, thus changing the transmission ratio and achieving gear shifting. Using the power transmission device of this invention can reduce or eliminate vibrations generated during transmission operation, preventing them from being transmitted along the power transmission path to the ball screw, worm gear, and motor. In this case, the drive shaft 2 can be a drive shaft within the transmission, while the transmission gear 4 can be connected to a corresponding component of the synchronizer.

[0025] The following combination Figure 3 and Figure 4 The specific structure of vibration damping component 1 is described below, in which... Figure 3 This diagram shows a cross-sectional view of the power transmission device of this invention after the drive shaft has been removed. Figure 4 An exploded schematic diagram of the power transmission device of this utility model is shown.

[0026] Overall, the vibration damping component 1 is connected to the transmission gear 4 via a first connecting member 10 and to the transmission shaft 2 via a second connecting member 15. The first connecting member 10 can be, for example, a pin, with its head abutting the outside of the transmission gear 2 and its tail connected to the outside of the vibration damping component 1 via a washer 11. The number of first connecting members 10 can be three or more, and they are preferably evenly distributed around the circumference to improve the stability and reliability of the connection. The second connecting member 15 can be an internal spline, which is radially fixedly connected to the transmission shaft 2 via an external spline 16 provided on the transmission shaft 2.

[0027] Furthermore, the vibration damping assembly 1 includes a first plate 5, a second plate 6, and a third plate 7, all three plates being arranged in a ring shape with a central hole for the transmission shaft 2 to pass through. The second plate 6 is axially located between the first plate 5 and the third plate 7. The first plate 5 is disposed adjacent to the transmission gear 2 and has multiple mounting cavities 12 for partially accommodating the spring 9. The first plate 5 also has multiple first through holes 17 for corresponding first connecting members 10 to pass through.

[0028] Preferably, an axially extending protruding block 14 is provided on the transmission gear 2, and a fourth through hole 20 is provided inside the protruding block 14 for the first connecting member 10 to pass through. The outline of the protruding block 14 corresponds to the outline of the first through hole 17, and the number of protruding blocks also corresponds, so that the protruding block 14 can limit and support the first plate 5 in the radial and circumferential directions. The cross-section of the protruding block 14 can be rectangular, trapezoidal, circular, etc. The cooperation between the first through hole 17 and the protruding block 14 forms a fast connection between the first plate 5 and the transmission gear 4.

[0029] The second plate 6 has a second connecting member 15 formed on the wall of the central hole, and a plurality of spring mounting holes 13 formed on its annular body. Spring support blocks 8 are disposed within the spring mounting holes 13 to provide support and fixation for the springs 9. Exemplarily, the spring mounting holes 13 are arranged in an arc or straight line shape, and their extension direction is perpendicular to the diameter of the second plate 6. A spring support block 8 is disposed at the end of each spring mounting hole 13, and the two ends of the spring 9 respectively engage with the corresponding spring support block 8. In addition, the second plate 6 also has a second through hole 18 through which the protruding block 14 or the first connecting member 10 passes.

[0030] Spring 9 is a helical spring, which is in a compressed state after being installed on spring support block 8. Spring 9 can be a helical spring that is entirely straight, so as to be installed in a straight spring mounting hole 13, or it can be a helical spring that is entirely curved, so as to be installed in a curved spring mounting hole 13. Alternatively, an elastomer such as rubber can be used instead of a spring.

[0031] The third plate 7 has a receiving cavity for accommodating the spring 9 on its side facing the second plate 6, and a third through hole 19 for the protruding block 14 or the first connecting member 10 to pass through. Figure 3 As shown, after assembly, the transmission gear 4, the first plate 5, the second plate 6, and the third plate 7 are arranged sequentially in the axial direction and are fixedly connected by the first connecting member 10, so that there is no relative movement between the four in the axial and circumferential directions.

[0032] The structure of the power transmission device of this utility model has been described in detail above. The function of the power transmission device will now be explained based on the above structural description.

[0033] The power transmission device can be applied to power systems where vibrations in gear transmissions need to be eliminated or reduced. Specifically, as described above, the power transmission device can be connected to the output shaft of an electric pump, motor, etc., via the drive shaft 2, while the transmission gear 4 meshes with another gear as a component in the power transmission stage. During rotation, if vibrations occur downstream of the transmission gear 4 along the power transmission path, the transmission gear 4 will transmit these vibrations to the vibration damping assembly 1 upon receiving them. Since the vibration damping assembly 1 contains springs arranged circumferentially or perpendicularly to the radial direction, the springs will at least partially absorb the transmitted vibrations, providing a certain buffering effect. Therefore, when the vibrations are transmitted to the drive shaft 2 via the splines on the second plate 6, the impact on the drive shaft 2 is reduced or even eliminated. On the other hand, the power transmission device can be connected to a shifting mechanism, where the drive shaft 2 can serve as a shaft in a transmission, the transmission gear 4 can serve as a gear in one of the gear positions, and the transmission gear 4 can be connected to a shift fork via, for example, a synchronizer. Therefore, when the transmission gear 4 receives vibration from the transmission shaft 2, the vibration reduction component 1 can reduce or eliminate the impact of the vibration on the shift fork and the transmission mechanism and power source such as the drive motor connected to the shift fork.

[0034] The vibration damping component 1 proposed in this utility model can be easily installed on existing gears and shafts. On the one hand, it is connected to the transmission shaft through splines, and on the other hand, it is connected to the gear through protrusions and pins. It is low in cost and reliable in connection. The modular design can effectively reduce the processing and manufacturing cost of parts.

[0035] The foregoing description is merely an exemplary embodiment relating to the spirit and principles of this utility model. Those skilled in the art will understand that various changes can be made to the described examples without departing from the spirit and principles, and these changes, and their various equivalents, are contemplated by this utility model and fall within the scope defined by the claims of this utility model.

Claims

1. A power transmission device, comprising a drive shaft (2) and a drive gear (4), characterized in that, The power transmission device further includes a vibration damping component (1), which is axially fixedly connected to the transmission gear (4) via a first connecting member (10) and circumferentially fixedly connected to the transmission shaft (2) via a second connecting member (15). The vibration damping component (1) includes a first plate (5), a second plate (6), and a third plate (7). At least one elastic element with elasticity in the circumferential direction is provided in the first plate (5), the second plate (6), and the third plate (7). An axial limiting member (3) is provided on the transmission shaft (2). The axial limiting member (3) is located on the side of the transmission gear (4) away from the vibration damping component (1).

2. The power transmission device according to claim 1, characterized in that, The elastic element is a helical spring (9).

3. The power transmission device according to claim 2, characterized in that, The number of the helical springs (9) is 3.

4. The power transmission device according to any one of claims 1-3, characterized in that, The first plate (5), the second plate (6) and the third plate (7) are arranged sequentially in the axial direction, and the first plate (5), the second plate (6) and the third plate (7) have the same outer diameter.

5. The power transmission device according to claim 4, characterized in that, The inner diameters of the first plate (5) and the third plate (7) are larger than the inner diameter of the second plate (6). The second connecting member (15) is disposed on the inner wall of the second plate (6). The second connecting member (15) is a spline.

6. The power transmission device according to claim 4, characterized in that, The transmission gear (4) has a protruding block (14), the first plate (5) has a first through hole (17), the second plate (6) has a second through hole (18), and the third plate (7) has a third through hole (19). The protruding block (14) and the first through hole (17) are circumferentially fixedly connected to the transmission gear (4) and the first plate (5) by form fit.

7. The power transmission device according to any one of claims 1-3, characterized in that, The first connecting member (10) is a pin.

8. A power system, comprising a power source, characterized in that, The power system further includes a power transmission device according to any one of claims 1-7.

9. The power system according to claim 8, characterized in that, The power source is a motor or an electric pump, and the transmission shaft (2) is fixedly connected to the output shaft of the power source.

10. The power system according to claim 8, characterized in that, The power system includes a shift fork and a synchronization mechanism, wherein the shift fork is connected to the synchronization mechanism, and the synchronization mechanism is connected to the transmission gear (4).

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