Torsion limiting device
By using a torque limiting device with a combination of disc spring and balls in the three-station switch operating mechanism, the existing device is solved with high cost, large size, and inability to remind users, effectively limiting and adjustability of torque is achieved, and cost and size are reduced while meeting application needs.
Patent Information
- Application Number
- CN202421105253.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-05-21
AI Technical Summary
The existing torque limiting device in the three-station switch operating mechanism has problems such as high cost, large size, and inability to remind users, which limits its application in actual use.
Torque limiting device including a first shaft, a second shaft, a housing, a disc spring and a ball are used to transmit torque through a combination of the disc spring and a ball, and to achieve torque limiting, and adjust to a desired torque value through an adjustable design.
The torque limiting device has achieved the goal of small size, simple structure, simple assembly and low cost. At the same time, the adjustable torque can be increased through the design of the disc spring to meet different application needs.
Smart Images
Figure CN222668739U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of electrical switches, in particular to a torque limiting device. Background Art
[0002] In order to prevent the three-position switch from being damaged by overload during operation, a torque limiting device is usually added to protect the three-position switch. Among the existing torque limiting devices for the three-position switch operating mechanism, one is a friction disc torque limiter. The disadvantage of this method is that it will not make a sound when the set torque value is reached, and it cannot remind the user. In addition, it is costly and large in size, which greatly limits the use of the three-position switch operating mechanism. Another torque limiting device is a compression spring and ball method. Although this torque limiter can make a sound to achieve the effect of an alarm, it is costly and large in size, and is also subject to certain limitations in use. Utility Model Content
[0003] In view of the deficiencies of the prior art, the utility model provides a torque limiting device, which has a simple structure, a small size and is easy to assemble.
[0004] In order to achieve the above object, the utility model is realized by the following technical solutions:
[0005] A torque limiting device includes a first shaft, a second shaft, a shell, a disc spring, and a ball. A connecting cavity is provided in the shell. The first end of the first shaft and the first end of the second shaft extend into the connecting cavity to fit together and perform friction transmission through the ball located therebetween. The second end of the first shaft and the second end of the second shaft extend out of the shell from both ends of the shell respectively. The disc spring is located in the connecting cavity and is sleeved on the first shaft to push the first shaft toward the second shaft. The depth of the second shaft extending into the connecting cavity is adjustable.
[0006] Furthermore, one end of the second shaft extending into the connecting cavity is provided with an external thread, one end of the connecting cavity is provided with a threaded hole, and the second shaft and the housing are connected by the cooperation of the external thread and the threaded hole.
[0007] Furthermore, a plurality of ball mounting holes are provided on the end surface of the first end of the second shaft, and a plurality of spherical grooves are provided on the end surface of the first end of the first shaft. The ball mounting holes and the spherical grooves are corresponding to each other for accommodating the balls.
[0008] Furthermore, the first shaft includes a shaft portion and a push plate, the push plate is located at the first end of the first shaft and fits with the second shaft, the spherical groove is arranged on the side of the push plate facing the second shaft, the shaft portion is vertically connected to the push plate, and the disc spring is sleeved on the shaft portion; the torque limiting device also includes a limit member, the limit member is provided with a shoulder, one end of the limit member extends into the connecting cavity to abut the disc spring, the shoulder abuts the inner wall of the connecting cavity, the other end of the limit member extends out of the connecting cavity, the limit member is provided with an inner hole, and the inner hole of the limit member forms a hole-shaft match with the shaft portion of the first shaft.
[0009] The utility model has the following beneficial effects:
[0010] 1. The disc spring is used instead of the compression spring, which reduces the size of the entire device; the disc spring and ball are used to transmit torque, which is small in size, simple to assemble and low in cost.
[0011] 2. The ball and the push plate are in contact with each other in the spherical groove, which has a simple structure and simplified assembly process;
[0012] 3. Using disc spring design to replace compression spring can increase the adjustable torque. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of a torque limiting device according to an embodiment of the utility model; DETAILED DESCRIPTION
[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0015] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.
[0016] like Figure 1 As shown, a torque limiting device includes a first shaft 1, a second shaft 5, a housing 2, a disc spring 3, and a ball 4. A connecting cavity is provided in the housing 2. The first end of the first shaft 1 and the first end of the second shaft 5 extend into the connecting cavity and fit together and perform friction transmission through the ball 4 located between the two. The second end of the first shaft 1 and the second end of the second shaft 5 extend out of the housing 2 from both ends of the housing 2 respectively. The disc spring 3 is located in the connecting cavity and is sleeved on the first shaft 1 to push the first shaft 1 toward the second shaft 5. The depth of the second shaft 5 extending into the connecting cavity is adjustable. Due to the compression force of the disc spring 3, the first shaft 1 and the second shaft 5 are connected together through the ball 4. When the torque on the first shaft 1 and the second shaft 5 exceeds the torque value that the first shaft 1 and the second shaft 5 can withstand when the disc spring 3 is compressed, the first shaft 1 and / or the second shaft 5 slide relative to the ball 4, so that the shafts are disengaged, thereby playing a role in limiting the torque. Since the depth of the second shaft 5 extending into the connecting cavity is adjustable, that is, the compression degree of the disc spring 3 is adjusted by adjusting the depth of the second shaft 5 entering the connecting cavity, so as to adjust to the required torque value. This solution uses disc springs 3 and balls 4 to transmit torque. The entire device is small in size, simple in structure, easy to assemble and low in cost.
[0017] Specifically, one end of the second shaft 5 extending into the connection cavity is provided with an external thread, and one end of the connection cavity is provided with a threaded hole, and the second shaft 5 is connected to the housing 2 through the cooperation of the external thread and the threaded hole. The required torque value can be adjusted by adjusting the depth dimension of the threaded connection between the second shaft 5 and the housing 2, which is simple and convenient. In other embodiments, the connection method between the second shaft 5 and the housing 2 is not limited to this.
[0018] A plurality of ball 4 mounting holes are provided on the end surface of the first end of the second shaft 5, and a plurality of spherical grooves are provided on the end surface of the first end of the first shaft 1, and the ball 4 mounting holes and the spherical grooves are one-to-one corresponding to accommodate the balls 4. Preferably, the plurality of balls 4 are evenly distributed so that the balls 4 are evenly stressed when transmitting force to the first shaft 1 and / or the second shaft 5.
[0019] In the specific structure, the first shaft 1 includes a shaft portion and a push plate 6, the push plate 6 is located at the first end of the first shaft 1 and fits with the second shaft 5, the spherical groove is provided on the side of the push plate 6 facing the second shaft 5, the shaft portion is vertically connected to the push plate 6, and the disc spring 3 is sleeved on the shaft portion. The torque limiting device also includes a limiter 7, the limiter 7 is provided with a shoulder, one end of the limiter 7 extends into the connecting cavity to abut against the disc spring 3, under the action of the disc spring 3, the shoulder abuts against the inner wall of the connecting cavity, and the other end of the limiter 7 extends out of the connecting cavity, the limiter 7 is provided with an inner hole, and is sleeved on the shaft portion of the first shaft 1 through the inner hole, and the inner hole of the limiter 7 forms a hole-shaft match with the shaft portion of the first shaft 1.
[0020] As described above, the embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. These modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model. Therefore, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the protection scope of the utility model.
Claims
1. A torque limiting device, characterized in that: It includes a first shaft, a second shaft, a housing, a disc spring, and a ball. A connecting cavity is provided in the housing. The first end of the first shaft and the first end of the second shaft extend into the connecting cavity and fit into the connecting cavity and perform friction transmission through the ball located therebetween. The second end of the first shaft and the second end of the second shaft extend out of the housing from both ends of the housing respectively. The disc spring is located in the connecting cavity and is sleeved on the first shaft to push the first shaft toward the second shaft. The depth of the second shaft extending into the connecting cavity is adjustable. The first shaft comprises a shaft portion and a push plate, the push plate is located at a first end of the first shaft and is in contact with the second shaft, the shaft portion is vertically connected to the push plate, and the disc spring is sleeved on the shaft portion; The torque limiting device also includes a limit member, which is provided with a shoulder. One end of the limit member extends into the connecting cavity to abut against the disc spring, and the shoulder abuts against the inner wall of the connecting cavity. The other end of the limit member extends out of the connecting cavity. The limit member is provided with an inner hole, and the inner hole of the limit member forms a hole-shaft fit with the shaft portion of the first shaft.
2. The torque limiting device according to claim 1, characterized in that: One end of the second shaft extending into the connecting cavity is provided with an external thread, one end of the connecting cavity is provided with a threaded hole, and the second shaft is connected to the housing through the cooperation of the external thread and the threaded hole.
3. The torque limiting device according to claim 1, characterized in that: A plurality of ball mounting holes are disposed on the end surface of the first end of the second shaft, and a plurality of spherical grooves are disposed on the end surface of the first end of the first shaft. The ball mounting holes and the spherical grooves are corresponding to each other to accommodate the balls.
Citation Information
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