A sealed torque limiter suitable for use in a switch conversion device
By designing a sealing torque limiter, the problem of unstable friction coefficient of friction coupling in humid environments is solved, achieving friction stability and reliability of turnout switching, and is suitable for turnout switching equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAN RAILWAY SIGNAL
- Filing Date
- 2025-07-02
- Publication Date
- 2026-06-26
AI Technical Summary
The existing friction coupling has an unstable coefficient of friction in humid environments, which affects the reliability of turnout switching equipment.
Design a sealing torque limiter that uses an integral seal between the inner and outer friction plates and a waterproof and breathable valve on the grooved nut to balance the pressure difference between the inside and outside, ensuring that the friction plates work in a dry environment.
It improves the frictional stability of the friction coupling, protects the switch machine motor from damage, ensures accurate turnout positioning, and is suitable for turnout switching equipment and similar applications.
Smart Images
Figure CN224409280U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of rail transit turnout switching equipment, and is a new type of sealing torque limiter structure applicable to rail transit turnout switching equipment, specifically, it relates to a sealing torque limiter applicable to turnout switching equipment. Background Technology
[0002] In railway signal control systems, turnout switching equipment is one of the key devices ensuring the safe operation of trains. It is responsible for controlling the switching of track switches to guide trains onto the designated tracks. Electric switch machines, as an important piece of equipment widely used in railway systems, are favored for their high reliability, strong adaptability, and ease of maintenance. Among them, the friction coupling, as one of the core components of the switch machine, plays a crucial role.
[0003] The main function of the friction coupler is to ensure that the output torque of the switch machine can smoothly complete the turnout switching action by adjusting the set friction force during the turnout switching process driven by the switch machine. When encountering abnormal resistance (such as ice and snow cover or mechanical jamming), the friction coupler allows relative friction sliding to occur inside, thereby protecting the switch machine motor from damage and ensuring that the turnout can be accurately positioned.
[0004] Most existing friction couplings are dry friction couplings. The environment in which friction couplings are used contains a lot of water vapor and volatile oil vapor. If these substances enter the friction surface, long-term use may cause changes in the coefficient of friction and result in unstable friction. Summary of the Invention
[0005] This invention provides a sealing torque limiter suitable for turnout switching equipment, in order to improve the sealing performance of the friction coupling, reduce the impact of environmental factors on the stable operation of the friction coupling, and improve the frictional stability of the friction coupling of the switch machine.
[0006] The technical solution of this utility model is as follows: A sealing torque limiter suitable for turnout switching equipment is provided, comprising: a housing, a coupling shaft, a grooved pressure nut, a coupling cover, a grooved gear, a sealing ring, a bearing, an inner friction plate, an outer friction plate, a spring, and a thrust needle roller bearing; there are 3 inner friction plates and 4 outer friction plates, which are alternately stacked together; the inner ring of the inner friction plate has 4 toothed structures that mate with 4 grooved structures on the coupling shaft; the outer friction plate has 4 toothed structures on its outer edge that mate with 4 grooved structures on the inner ring of the grooved gear; the inner friction plate and the coupling shaft rotate together, and the outer friction plate and the grooved gear rotate together; the inner and outer friction plates are stacked together, and the pressure generated by 12 springs creates a positive pressure between the inner and outer friction plates. When there is a relative angular velocity between the coupling shaft and the grooved gear, the inner and outer friction plates rub against each other, generating frictional force.
[0007] The coupling shaft is fixed to the housing by bearings; the coupling shaft is fixed to the coupling cover by bearings.
[0008] The housing is fastened to the grooved gear and the coupling cover by connecting bolts; there are 12 holes on the housing, and 12 springs are installed inside. One end of the 12 springs contacts the outer friction plate, and the other end contacts the round steel plate; the other end of the round steel plate contacts the thrust needle roller bearing.
[0009] The coupling shaft is sealed with sealing rings between itself and the housing and the coupling cover; the sealing rings are all designed inside the bearing; O-rings are designed between the grooved gear and the coupling cover, and between the grooved gear and the housing for static sealing; two O-rings are designed on both sides of the grooved nut and the housing threaded connection for sealing.
[0010] The outer side of the grooved nut is designed with a waterproof and breathable valve to balance the pressure difference between the inside and outside.
[0011] The internal friction plates include an inner friction plate and an outer friction plate, which are sealed together within the sealed cavity.
[0012] The thrust needle roller bearing is installed in the groove of the grooved nut; the grooved nut is connected to the housing by threads.
[0013] The advantages of this utility model are:
[0014] By designing the inner and outer friction plates within a sealed cavity, the influence of external environmental factors on the friction performance of the inner and outer friction plates is reduced. The cavity contains no other grease-containing parts, ensuring its dryness and cleanliness and guaranteeing stable friction performance.
[0015] By designing a waterproof and breathable valve on the grooved pressure nut, the pressure difference between the inside and outside of the sealed cavity is kept consistent, preventing a decrease in sealing performance due to the pressure difference.
[0016] The present invention will be further described below with reference to the accompanying drawings of the embodiments. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model.
[0018] In the diagram: 1. Grooved nut; 2. Waterproof and breathable valve; 3. Housing; 4. Thrust needle roller bearing; 5. Spring; 6. First O-ring seal; 7. Inner friction plate; 8. Grooved gear; 9. Outer friction plate; 10. Second O-ring seal; 11. Connector cover; 12. Connector shaft; 13. Third O-ring seal; 14. Fourth O-ring seal; 15. First bearing; 16. First lip seal; 17. Second lip seal; 18. Connecting bolt; 19. Second bearing. Detailed Implementation
[0019] To further illustrate the technical means and effects of this utility model in achieving its intended purpose, the specific implementation methods, structural features and effects of this utility model are described in detail below with reference to the accompanying drawings and embodiments.
[0020] like Figure 1 As shown, this utility model relates to a sealing torque limiter suitable for turnout switching equipment. Its structure includes: a grooved pressure nut 1, a housing 3, a connector shaft 12, a grooved pressure nut 1, a waterproof and breathable valve 2, a connector cover 11, a grooved gear 8, a first O-ring seal 6, a second O-ring seal 10, a third O-ring seal 13, a fourth O-ring seal 14, a first bearing 15, a first lip seal 16, a second lip seal 17, a second bearing 19, a thrust needle roller bearing 4, a spring 5, an inner friction plate 7, a grooved gear 8, an outer friction plate 9, and a connecting bolt 18. The inner friction plate 7 (3 pieces) and the outer friction plate 9 (4 pieces) are alternately stacked together. The inner friction plate 7 has four toothed structures on its inner ring, which are connected to four grooved structures on the coupling shaft 12. The outer friction plate 9 has four toothed structures on its outer ring edge, which are connected to four grooved structures on the inner ring of the grooved gear 8. The inner friction plate 7 and the coupling shaft 12 rotate together, and the outer friction plate 9 and the grooved gear 8 rotate together. The inner friction plate 7 and the outer friction plate 9 overlap each other. The pressure generated by the 12 springs 5 creates a positive pressure between the inner friction plate 7 and the outer friction plate 9. When there is a relative angular velocity between the coupling shaft 12 and the grooved gear 8, the inner friction plate 7 and the outer friction plate 9 rub against each other, generating frictional force.
[0021] The coupling shaft 12 is positioned and fixed to the housing 3 by the first bearing 15, and the coupling cover 11 is positioned and fixed to the coupling shaft 12 by the second bearing 19. The housing 3 is fastened to the grooved gear 8 and the coupling cover 11 by bolts. The housing 3 has 12 holes, and 12 springs 5 are installed inside. One end of the 12 springs 5 contacts the outer friction plate 9, and the other end contacts the round steel plate. The other end of the round steel plate contacts the thrust needle roller bearing 4. The thrust needle roller bearing 4 is installed in the groove of the grooved pressure nut 1. The grooved pressure nut 1 is connected to the housing 3 by threads. When the grooved pressure nut 1 is screwed into the housing 3, the thrust needle roller bearing 4 can push the round steel plate and compress the 12 springs 5, so that the elastic force is applied between the inner friction plate 7 and the outer friction plate 9 to generate positive pressure.
[0022] The coupling shaft 12 and the housing 3 are sealed with a first lip seal ring 16, and the coupling cover 11 and the coupling shaft 12 are sealed with a second lip seal ring 17. Both lip seal rings are designed inside the first bearing 15 and the second bearing 19. The grooved gear 8 and the coupling cover 11 are sealed with a second O-ring seal ring 10, and the grooved gear 8 and the housing 3 are sealed with a first O-ring seal ring 6. The grooved nut 1 and the housing 3 are sealed with a third O-ring seal ring 13 and a fourth O-ring seal ring 14 on the inner side of the threaded connection. Through the above sealing design, the inner friction plate 7 and the outer friction plate 9 are placed in a sealed cavity, completely isolated from the external environment.
[0023] Because the inner friction plate 7 and the outer friction plate 9 generate heat when they rub against each other, the air in the internal sealed cavity will generate an internal and external pressure difference after being heated, which will affect the sealing performance. In order to reduce the internal and external air pressure difference, a waterproof and breathable valve 2 is designed on the outside of the grooved pressure nut 1 to balance the internal and external pressure difference and ensure the effectiveness of the seal.
[0024] The working process of this utility model is to limit the maximum output torque of the device by adjusting the set friction force. When the output torque is less than the set value, the torque is transmitted between the internal friction plates through the static friction between the friction plates. When the output is overloaded, friction slippage will occur between the internal friction plates, maintaining the output torque at a set value, thereby protecting the driving and driven equipment from damage. When applied to turnout switching equipment, the motor output torque passes through the torque limiter and the output force drives the turnout to realize the turnout switching. When encountering abnormal resistance on the turnout (such as ice and snow cover, foreign object mechanical obstruction), relative friction slippage will occur inside the friction coupling, thereby protecting the motor and the external turnout from damage and ensuring that the turnout can be accurately positioned. This sealed torque limiter can also be used in other application scenarios with similar application conditions, such as turnout switching equipment.
[0025] It should be noted that the above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications or substitutions should be considered to fall within the protection scope of the present invention.
Claims
1. A sealing torque limiter suitable for turnout switching equipment, characterized in that: include: The components include: housing (3), connector shaft (12), grooved nut (1), connector cover (11), grooved gear (8), sealing ring, bearing, inner friction plate (7), outer friction plate (9), spring (5), and thrust needle roller bearing (4). There are 3 inner friction plates (7) and 4 outer friction plates (9). The 3 inner friction plates and 4 outer friction plates are stacked together alternately. The inner ring of the inner friction plate (7) has 4 toothed structures, which match the 4 grooved structures on the connector shaft (12). The outer friction plate (9) has four toothed structures on its outer ring edge, which are connected to the four grooved structures on the inner ring of the grooved gear. The inner friction plate (7) and the coupling shaft (12) rotate together, and the outer friction plate (9) and the grooved gear rotate together. The inner and outer friction plates are stacked together, and the pressure generated by the 12 springs (5) generates a positive pressure between the inner and outer friction plates. When there is a relative angular velocity between the coupling shaft (12) and the grooved gear, the inner and outer friction plates rub against each other and generate friction force.
2. A sealing torque limiter for turnout switching equipment according to claim 1, characterized in that: The coupling shaft (12) is fixed to the housing (3) by bearing positioning; the coupling shaft (12) is fixed to the coupling cover (11) by bearing positioning.
3. A sealing torque limiter for turnout switching equipment according to claim 1, characterized in that: The housing (3) is connected and fastened to the grooved gear (8) and the connector cover (11) by connecting bolts (18); the housing (3) has 12 holes and 12 springs (5) are installed inside. One end of the 12 springs (5) is in contact with the outer friction plate (9) and the other end is in contact with the round steel plate; the other end of the round steel plate is in contact with the thrust needle roller bearing (4).
4. A sealing torque limiter for turnout switching equipment according to claim 1, characterized in that: A sealing ring is designed between the coupling shaft (12) and the housing (3) and the coupling cover (11) for sealing; the sealing rings are designed inside the bearing; O-rings are designed between the grooved gear (8) and the coupling cover (11), and between the grooved gear (8) and the housing (3) for static sealing; two O-rings are designed on both sides of the grooved nut (1) and the housing (3) for sealing.
5. A sealing torque limiter for turnout switching equipment according to claim 1, characterized in that: The outer side of the grooved pressure nut (1) is designed with a waterproof and breathable valve to balance the pressure difference between the inside and outside.
6. A sealing torque limiter for turnout switching equipment according to claim 1, characterized in that: The internal friction plates include an inner friction plate (7) and an outer friction plate (9), which are sealed together in the sealed cavity.
7. A sealing torque limiter for turnout switching equipment according to claim 1, characterized in that: The thrust needle roller bearing (4) is installed in the groove of the grooved nut (1); the grooved nut (1) is connected to the housing (3) by threads.