Overload protection mechanism and actuator

Abstract

The utility model discloses an overload protection mechanism and an actuator. The overload protection mechanism comprises a driving shaft, a driven shaft and an elastic piece, the driving shaft and the driven shaft transmit torque through a face gear, the elastic piece is used for connecting the driving shaft and the driven shaft, and the elastic piece is connected with the driving shaft and the driven shaft in a well-installed state. And the elastic piece enables the driving shaft and the driven shaft to have a tendency of approaching each other in the axial direction under the action of pre-tightening force. According to the overload protection mechanism, overload of the actuator can be prevented.

Description

Technical Field

[0001] This application relates to the field of actuators, and more specifically, to an overload protection mechanism and an actuator having such an overload protection mechanism. Background Technology

[0002] Valves used in heating / cooling systems have actuators, including electrically operated actuators for automatically opening and closing the valves. Actuators also include manually operated actuators for assisting in opening and closing the valves.

[0003] However, when operating manually, using a wrench or handwheel connected to a gear makes it difficult to control the applied torque, and the actuator is easily damaged when overloaded. Utility Model Content

[0004] The main technical problem this application aims to solve is how to prevent actuator overload.

[0005] To solve the above-mentioned technical problems, this application provides an overload protection mechanism, which includes a drive shaft, a driven shaft, and an elastic element. The drive shaft and the driven shaft transmit torque through a planar gear. The elastic element is used to connect the drive shaft and the driven shaft. In the installed state, the elastic element, under the action of preload, causes the drive shaft and the driven shaft to tend to move closer to each other in the axial direction.

[0006] According to one aspect of the overload protection mechanism of this application, the end of the elastic element is slidably connected to at least one of the drive shaft and the driven shaft.

[0007] According to one aspect of the overload protection mechanism of this application, one end of the elastic element is fixedly connected to one of the drive shaft and the driven shaft, and the other end of the elastic element is slidably connected to the other of the drive shaft and the driven shaft.

[0008] According to one aspect of the overload protection mechanism of this application, the end of the elastic element is arc-shaped, and at least one of the drive shaft and the driven shaft is configured with a matching structure.

[0009] According to an overload protection mechanism proposed in one aspect of this application, at least one of the drive shaft and the driven shaft is provided with a recess for fixing the elastic element, the recess being a hole and / or a groove.

[0010] According to one aspect of the overload protection mechanism of this application, one of the drive shaft and the driven shaft is provided with a protrusion, and the other of the drive shaft and the driven shaft is provided with a settling portion, wherein the protrusion can be inserted into the settling portion.

[0011] According to one aspect of the overload protection mechanism of this application, a sleeve is provided in the drive shaft, the sleeve being capable of engaging with a wrench.

[0012] According to one aspect of the overload protection mechanism of this application, one end of the elastic element is constructed in an arc shape, the drive shaft is constructed with a matching groove, the end of the elastic element can slide in the groove, and a first groove is provided along the axial direction in the driven shaft for fixing the elastic element.

[0013] According to one aspect of the overload protection mechanism proposed in this application, two or more elastic elements are connected into a whole by a connecting part, and a second groove is provided in the passive shaft for fixing the connecting part.

[0014] On the other hand, this application provides an actuator that includes the aforementioned overload protection mechanism.

[0015] According to the technical solution of this application, under the action of preload, the elastic element causes the drive shaft and the driven shaft to tend to move closer to each other in the axial direction, pressing the drive shaft and the driven shaft so that the planar gear between them can mesh normally to transmit torque. When the torque input through the drive shaft is too large, the preload of the elastic element is insufficient to press the drive shaft and the driven shaft so that the planar gear between them can mesh normally, thereby playing the role of overload protection. Attached Figure Description

[0016] The disclosure of this application is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Wherein:

[0017] Figure 1 This illustration schematically shows an overload protection mechanism according to one embodiment of the present application;

[0018] Figure 2 Schematic representation Figure 1 Exploded view of the overload protection mechanism in the middle;

[0019] Figure 3 A schematic top view is shown. Figure 1 Overload protection mechanism in the middle;

[0020] Figure 4 The diagram illustrates an overload protection mechanism according to another embodiment of this application. Detailed Implementation

[0021] The embodiments of this application will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of this application.

[0022] An overload protection mechanism according to a specific embodiment of this application includes a drive shaft, a driven shaft, and an elastic element. The drive shaft receives torque, for example, via a wrench, and then transmits that torque to the driven shaft. Here, "drive" and "driven" refer only to the torque transmission function between them. The drive shaft and the driven shaft transmit torque via planar gears. Specifically, the drive shaft has a drive planar gear, and the driven shaft has a driven planar gear; the drive planar gear meshes with the driven planar gear to transmit torque from the drive shaft to the driven shaft. The planar gears have an angle relative to the axial direction of the drive shaft and the driven shaft, such that during the torque transmission between the drive shaft and the driven shaft, the drive shaft and the driven shaft tend to move away from each other axially.

[0023] The elastic element connects the drive shaft and the driven shaft. Specifically, in the installed state, the elastic element, under preload, causes the drive shaft and the driven shaft to tend to move closer together axially. During normal torque transmission between the drive shaft and the driven shaft, the preload of the elastic element overcomes the tendency of the drive shaft and the driven shaft to move away axially, keeping the drive gear on the drive shaft and the driven gear on the driven shaft engaged to transmit torque. When the torque input through the drive shaft is too large, for example, exceeding a certain threshold, the preload of the elastic element is insufficient to overcome the tendency of the drive shaft and the driven shaft to move away axially, causing the gears to disengage. Torque cannot be smoothly transmitted from the drive shaft to the driven shaft, thus providing overload protection.

[0024] The torque threshold can be adjusted by the number of planar gears, the inclination angle of the planar gears, the number of elastic elements, and the elastic coefficient of the elastic elements.

[0025] According to one specific embodiment of this application, the end of the elastic element is slidably connected to at least one of the drive shaft and the driven shaft. For example, the end of the elastic element engages with a groove in at least one of the drive shaft and the driven shaft, allowing them to slide relative to each other. Under overload conditions, the drive shaft and the driven shaft will rotate relative to each other. In this way, the elastic element will not undergo torsional deformation due to the relative rotation of the drive shaft and the driven shaft, and the overload protection function will always be active. When the overload is eliminated, torque can be normally transmitted between the drive shaft and the driven shaft without additional adjustment or correction.

[0026] For example, the end of the elastic element is constructed to be arc-shaped, and at least one of the drive shaft and the passive shaft is constructed to cooperate with it, such as an arc-shaped groove or protrusion, so that the arc-shaped end of the elastic element can slide smoothly.

[0027] Optionally, one end of the elastic element is fixedly connected to one of the driving shaft and the driven shaft, and the other end of the elastic element is slidably connected to the other of the driving shaft and the driven shaft. This fixed connection reliably fixes one end of the elastic element.

[0028] For example, at least one of the drive shaft and the driven shaft has a recess for fixing the elastic element, and the recess is a hole and / or a groove. For example, the end of the elastic element can be inserted into the hole, and the outer contour of the elastic element at least partially mates with the groove, thereby achieving a fixing effect.

[0029] Furthermore, one of the drive shaft and the driven shaft has an axially extending protrusion, and the other of the drive shaft and the driven shaft has an axially extending sinking portion, into which the protrusion can be inserted. Preferably, there is a gap between the protrusion and the sinking portion. The cooperation between the sinking portion and the protrusion guides the installation of the drive shaft and the driven shaft during installation and prevents the drive shaft from rotating relative to the driven shaft about an axis perpendicular to the axial direction during operation.

[0030] Reference to an overload protection mechanism according to a specific embodiment of this application Figures 1 to 3 As shown, the drive shaft 1 has a protrusion 11, and the driven shaft 2 has a settling portion, the protrusion being able to be inserted into the settling portion. A sleeve 12 is provided in the drive shaft, which can cooperate with a wrench to transmit driving force to the drive shaft. One end (upper end in the figure) of the elastic element 3 is arc-shaped, and the drive shaft has a corresponding groove 13, allowing this end (upper end in the figure) of the elastic element to slide within the groove. The other end (lower end in the figure) of the elastic element is fixed to a fixing hole in the driven shaft. A first groove 21 is provided axially in the driven shaft, the first groove being used to fix the elastic element, particularly the lower half of the elastic element.

[0031] Reference to an overload protection mechanism according to a specific embodiment of this application Figure 4 As shown, two elastic elements are connected into a single unit via a connecting part 31. A second groove is provided in the passive shaft to secure the connecting part. This method speeds up the assembly process of the elastic elements and improves consistency. Of course, two or more elastic elements can also be connected into a single unit via the connecting part.

[0032] This application also includes an actuator with an overload protection mechanism of any one or more of the foregoing embodiments, the technical features and effects of which are corresponding to the foregoing description, and therefore will not be repeated here.

Claims

1. An overload protection mechanism, characterized in that, The overload protection mechanism includes a drive shaft, a driven shaft, and an elastic element. The drive shaft and the driven shaft transmit torque through a planar gear. The elastic element is used to connect the drive shaft and the driven shaft. In the installed state, the elastic element, under the action of preload, causes the drive shaft and the driven shaft to tend to move closer to each other in the axial direction.

2. The overload protection mechanism according to claim 1, characterized in that, The end of the elastic element is slidably connected to at least one of the active shaft and the passive shaft.

3. The overload protection mechanism according to claim 2, characterized in that, One end of the elastic element is fixedly connected to one of the driving shaft and the driven shaft, and the other end of the elastic element is slidably connected to the other of the driving shaft and the driven shaft.

4. The overload protection mechanism according to claim 2, characterized in that, The end of the elastic element is arc-shaped, and at least one of the driving shaft and the driven shaft is configured to cooperate with it.

5. The overload protection mechanism according to claim 1, characterized in that, At least one of the drive shaft and the driven shaft is provided with a recessed portion, which is used to fix the elastic element, and the recessed portion is a hole and / or groove.

6. The overload protection mechanism according to claim 1, characterized in that, One of the drive shaft and the driven shaft is provided with a protrusion, and the other of the drive shaft and the driven shaft is provided with a settling part, and the protrusion can be inserted into the settling part.

7. The overload protection mechanism according to claim 1, characterized in that, A sleeve is provided in the drive shaft, and the sleeve can be used with a wrench.

8. The overload protection mechanism according to claim 1, characterized in that, One end of the elastic element is constructed in an arc shape, and the drive shaft is constructed with a matching groove. This end of the elastic element can slide in the groove. A first groove is provided along the axial direction in the driven shaft, and the first groove is used to fix the elastic element.

9. The overload protection mechanism according to claim 8, characterized in that, Two or more elastic elements are connected into a whole by a connecting part, and a second groove is provided in the passive shaft for fixing the connecting part.

10. An actuator, characterized in that, It includes an overload protection mechanism according to any one of claims 1 to 9.

Images