Self-lubricating maintenance-free inertia wheel device

Abstract

The present application relates to electro-hydraulic switcher technical field, and disclose a kind of self-lubricating maintenance-free inertia wheel device;The device includes inertia wheel body, lead bronze copper sleeve that is sleeved on motor shaft, and nylon 66 friction ring that is press-fitted in the inner hole of body, both constitute main self-lubricating friction pair;The inner hole of copper sleeve is locally arc surface design to reduce contact area, and the inner hole of body is provided with debugging piece for providing axial compression force for friction ring.The present application is realized long-term stable operation under the condition of no external oil injection by self-lubricating friction pair cooperation arc surface design, and friction coefficient is smooth and constant, secondary sharp wave, jamming failure and operating abnormal sound in monitoring curve are eliminated from the root;Through eight gears quick adjusting structure, the accurate setting and reliable locking of compression force are realized, so that the equipment can be maintenance-free operation in whole life cycle after one-time setting, and it is suitable for track traffic electro-hydraulic switcher and other occasions with strict requirements on reliability and maintainability.

Description

Technical Field

[0001] This invention relates to the field of electro-hydraulic switch machine technology, specifically to a self-lubricating, maintenance-free inertial wheel device. Background Technology

[0002] As a key execution device in the rail transit signaling system, the operational stability and reliability of the electro-hydraulic switch machine directly affect the safety of train operation. The inertia wheel is one of the core components of the electro-hydraulic switch machine. Its main function is to use rotational inertia to balance and convert forces, ensuring the smoothness of the operation process. In the existing technology, the inertia wheel is usually made of metal and forms a friction pair with the motor shaft. It is maintained by periodic oil lubrication to reduce friction and prevent abnormal noise and jamming.

[0003] The main advantage of the existing technical solution lies in its relatively simple structure, and the ability to alleviate friction abnormalities caused by insufficient lubrication or impurity intrusion in the short term through regular maintenance (such as lubrication, wiping, or replacement of parts). However, this solution has the following obvious shortcomings: strong maintenance dependence: the inertia wheel is prone to changes in friction characteristics due to the drying, contamination, or loss of grease during operation, requiring frequent lubrication or cleaning maintenance; otherwise, it is easy to cause secondary spikes in the monitoring curve, accompanied by jamming and abnormal noise.

[0004] High recurrence rate of failures: Although maintenance can temporarily alleviate the problem, the failure to fundamentally improve the material and structural characteristics of the friction pair leads to repeated occurrences of the same type of failure in a short period of time.

[0005] High overall costs: Maintenance of hundreds of thousands of devices on site needs to be performed every quarter, consuming a lot of manpower, time and material resources, affecting equipment availability and operational efficiency.

[0006] Unstable performance: In the absence of lubrication, the friction coefficient between the traditional copper sleeve and the metal shaft fluctuates greatly, making it impossible to achieve long-term stable operation. Summary of the Invention

[0007] The purpose of this invention is to provide a self-lubricating, maintenance-free inertia wheel device to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a self-lubricating, maintenance-free inertia wheel device, comprising: an inertia wheel body, wherein a copper sleeve is disposed in the inertia wheel body, the copper sleeve is fitted and fixed on a motor shaft, a friction ring is press-fitted in the inner hole of the inertia wheel body, the copper sleeve is made of lead bronze, and the friction ring is made of nylon 66, the inner cylindrical surface of the friction ring and the outer cylindrical surface of the copper sleeve constitute a main self-lubricating friction pair, and an adjustment component for providing axial clamping force to the friction ring is also disposed in the inner hole of the inertia wheel body.

[0009] As a preferred embodiment of the self-lubricating, maintenance-free inertia wheel device of the present invention, the inner working surface of the copper sleeve is designed with a partial arc surface to reduce the actual contact area with the motor shaft.

[0010] As a preferred embodiment of the self-lubricating, maintenance-free inertia wheel device of the present invention, wherein: a locating pin is radially inserted into the copper sleeve and extends into the motor shaft.

[0011] As a preferred embodiment of the self-lubricating maintenance-free inertia wheel device of the present invention, the surface of the inertia wheel body is provided with a plurality of inertia grooves in a circular array, a counterweight is provided in the inertia groove, a first spring is fixedly connected to the side of the counterweight away from the copper sleeve, and the other end of the first spring is fixed to the inner wall of the inertia groove.

[0012] As a preferred embodiment of the self-lubricating, maintenance-free inertia wheel device of the present invention, six counterweights are provided, which are used to move and lock along the inertia groove on the inertia wheel body to change the rotational inertia of the system.

[0013] As a preferred embodiment of the self-lubricating maintenance-free inertia wheel device of the present invention, the adjustment component includes a cam disposed in the inner hole of the inertia wheel body, a second spring disposed below the cam, and the other end of the second spring being fixed to a friction ring.

[0014] As a preferred embodiment of the self-lubricating, maintenance-free inertia wheel device of the present invention, wherein: adjustment slots are provided on both sides of the inertia wheel body, a shaft is inserted between the two adjustment slots, the shaft passes through a cam, and positioning plates are fixedly connected to both ends of the shaft; a third spring is fixedly connected to the side of one positioning plate near the adjustment slot, and a stop lever is fixedly connected to the side of the other positioning plate near the adjustment slot; and a stop hole is provided on the inner wall of the adjustment slot away from the side with the third spring, and the stop lever is inserted into the stop hole.

[0015] As a preferred embodiment of the self-lubricating, maintenance-free inertia wheel device of the present invention, the gear lever and gear hole are arranged in a circular array of eight, with the shaft center as the base point.

[0016] In a preferred embodiment of the self-lubricating, maintenance-free inertia wheel device of the present invention, the shaft and the cam are connected by a key.

[0017] As a preferred embodiment of the self-lubricating maintenance-free inertia wheel device of the present invention, a groove is provided at the connection between the cam and the shaft, and the inner wall of the groove contacts the limiting key on the surface of the shaft.

[0018] The beneficial effects of this invention are as follows: By using lead bronze for the copper sleeve and nylon 66 for the friction ring to form the main self-lubricating friction pair, and by designing a partial arc surface on the inner working surface of the copper sleeve to reduce the actual contact area with the motor shaft, the friction pair operates smoothly and the friction resistance is smooth and constant, thus eliminating secondary spikes, jamming faults, and abnormal noises in the monitoring curve from the root. The eight-speed quick adjustment and reliable locking are achieved through the cooperation of the shaft, positioning plate, third spring, gear lever, and eight annular array gear holes. The axial clamping force of the friction ring can be precisely adjusted by rotating the cam to adapt to different working conditions. With the help of the self-lubricating friction pair, the equipment can achieve maintenance-free operation throughout its entire life cycle after a one-time setting, overcoming the shortcomings of traditional solutions that require frequent manual maintenance. Attached Figure Description

[0019] Figure 1 This is an overall structural diagram of a self-lubricating, maintenance-free inertia wheel device.

[0020] Figure 2 This is a structural cross-sectional view of the inertia wheel body of a self-lubricating, maintenance-free inertia wheel device.

[0021] Figure 3 A schematic diagram of the friction ring and copper sleeve of a self-lubricating, maintenance-free inertia wheel device.

[0022] Figure 4 For self-lubricating, maintenance-free inertia wheel devices Figure 3 Enlarged view of the structure at point A in the middle.

[0023] The following numbers are labeled in the diagram: 100, inertia wheel body; 110, counterweight; 111, first spring; 120, friction ring; 121, second spring; 122, cam; 1221, shaft; 1222, positioning plate; 1223, third spring; 1224, gear lever; 1225, gear hole; 1226, groove; 1227, adjustment groove; 130, inertia slide; 140, copper sleeve; 141, positioning pin. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figures 1-4As shown, a self-lubricating, maintenance-free inertia wheel device includes: an inertia wheel body 100, a copper sleeve 140 disposed in the inertia wheel body 100, the copper sleeve 140 being fitted and fixed on a motor shaft, a friction ring 120 being press-fitted into the inner hole of the inertia wheel body 100, the copper sleeve 140 being made of lead bronze, and the friction ring 120 being made of nylon 66, the inner cylindrical surface of the friction ring 120 and the outer cylindrical surface of the copper sleeve 140 forming a main self-lubricating friction pair, and an adjustment component for providing axial clamping force to the friction ring 120 being disposed in the inner hole of the inertia wheel body 100.

[0026] The copper sleeve 140 made of lead bronze and the friction ring 120 made of nylon 66 constitute a self-lubricating friction pair: the lead particles uniformly distributed in the lead bronze are transferred to the friction surface under shearing action during friction, forming a continuous and firmly adhered solid lubricating film. This film can effectively isolate the direct metal contact between the copper sleeve 140 and the friction ring 120, so that the friction pair can maintain a low and stable coefficient of friction even without external oil lubrication. At the same time, the nylon 66 material itself has good shock absorption and noise reduction properties, which can absorb and dampen the small vibrations generated during friction, avoiding fluctuations in the coefficient of friction caused by vibration excitation. The self-lubricating properties of lead bronze and the friction-reducing and shock-reducing properties of nylon 66 work together to keep the frictional resistance of the friction pair smooth and constant.

[0027] When the motor shaft rotates, the copper sleeve 140 rotates synchronously with the motor shaft. Under the axial clamping force provided by the debugging component, the friction ring 120 is pressed against the outer cylindrical surface of the copper sleeve 140, generating a stable frictional torque between them. This frictional torque drives the inertia wheel body 100 to rotate accordingly. Since the friction coefficient of the friction pair does not deteriorate significantly with the extension of the running time, the torque output by the inertia wheel remains smooth and continuous throughout the entire process of starting, running, and braking. There will be no sudden change in the friction coefficient caused by the drying or contamination of grease in traditional metal friction pairs. This eliminates the abnormal secondary spikes, jamming faults, and abnormal operating noises in the monitoring curve at the source, enabling the equipment's status monitoring signal to truly and reliably reflect the actual working conditions.

[0028] Specifically, the inner working surface of the copper bushing 140 is designed with a partial arc surface to reduce the actual contact area with the motor shaft.

[0029] The inner working surface of the copper sleeve 140 is not fully flush with the motor shaft surface, but rather adopts a partially arc-shaped structure. This effectively reduces the actual contact area between the copper sleeve 140 and the motor shaft while ensuring a reliable fit. The reduced contact area directly decreases the tendency for stick-slip effects caused by interlocking micro-irregularities on the surface, resulting in smoother relative movement. Simultaneously, the non-full-circumferential contact gap facilitates timely dissipation of frictional heat, avoiding the adverse effects of localized overheating on the stability of the material and lubricating film. This structure, combined with the self-lubricating properties of lead bronze, ensures that the transmission interface between the copper sleeve 140 and the motor shaft can operate smoothly and quietly even without oil.

[0030] Specifically, a locating pin 141 is radially inserted into the copper sleeve 140, extending into the motor shaft.

[0031] The locating pin 141 fixes the copper sleeve 140 to the motor shaft in the circumferential direction, ensuring that the rotational power of the motor shaft can be reliably transmitted to the copper sleeve 140 through the locating pin 141, so that the two always rotate synchronously without relative slippage, providing a basic transmission guarantee for the stable output of friction torque.

[0032] Specifically, the surface of the inertia wheel body 100 is provided with a plurality of inertia grooves 130 in a ring array. A counterweight 110 is provided in the inertia groove 130. A first spring 111 is fixedly connected to the side of the counterweight 110 away from the copper sleeve 140. The other end of the first spring 111 is fixed to the inner wall of the inertia groove 130. Six counterweights 110 are provided to move and lock along the inertia grooves 130 on the inertia wheel body 100 to change the rotational inertia of the system.

[0033] During the rotation of the inertia wheel body 100, the counterweight 110 is simultaneously subjected to the outward pushing action of centrifugal force and the inward pulling action of the first spring 111. When the inertia wheel is in the starting stage or operating at low speed, the rotational speed is low, and the centrifugal force is insufficient to overcome the preload of the first spring 111. The counterweight 110 remains in the inward-retracted position near the center of rotation. At this time, the rotational inertia of the system is small, exhibiting low inertia characteristics. This allows the inertia wheel to quickly respond to the drive command of the motor and accelerate smoothly, avoiding torque impact caused by excessive inertia, thereby eliminating the monitoring curve in the starting stage. Secondary spike; as the rotational speed gradually increases, the centrifugal force on the counterweight 110 increases accordingly. When the centrifugal force exceeds the tension of the first spring 111, the counterweight 110 is thrown outward along the inertia groove 130, and the rotational inertia of the system increases accordingly. When entering the braking stage, the increased rotational inertia is converted into an inertial torque to resist the change in rotational speed. This torque can effectively suppress the reverse rotation trend after the motor stops, ensuring reliable braking. The six counterweights 110 are evenly distributed in a ring array, so that the change in inertia is consistent in the circumferential direction, avoiding additional vibration caused by uneven mass distribution.

[0034] Specifically, the debugging component includes a cam 122 disposed in the inner hole of the inertia wheel body 100, a second spring 121 disposed below the cam 122, and the other end of the second spring 121 being fixed to the friction ring 120.

[0035] The end face of cam 122 is a non-planar structure with a specific lift curve. When cam 122 is rotated, the change in the lift of its end face will drive the second spring 121 to produce different degrees of compression or release. The change in the compression of the second spring 121 directly changes the axial clamping force it applies to the friction ring 120. This axial clamping force determines the magnitude of the normal force between the friction ring 120 and the copper sleeve 140, and thus directly affects the value of the friction torque between them. By rotating cam 122 to adjust the compression of the second spring 121, precise control of the friction torque can be achieved: when the clamping force is reduced, the frictional resistance between the friction ring 120 and the copper sleeve 140 is reduced, and the inertia wheel starts more sensitively; when the clamping force is increased, the friction torque is increased, ensuring the reliability of torque transmission and braking holding force.

[0036] Specifically, the inertia wheel body 100 has adjustment slots 1227 on both sides, and a shaft 1221 is inserted between the two adjustment slots 1227. The shaft 1221 passes through the cam 122, and positioning plates 1222 are fixedly connected to both ends of the shaft 1221. A third spring 1223 is fixedly connected to the side of one positioning plate 1222 near the adjustment slot 1227, and a gear lever 1224 is fixedly connected to the side of the other positioning plate 1222 near the adjustment slot 1227. A gear hole 1225 is opened on the inner wall of the adjustment slot 1227 away from the side with the third spring 1223, and the gear lever 1224 is inserted into the gear hole 1225. The gear levers 1224 and the gear holes 1225 are arranged in a circular array with the axis of the shaft 1221 as the base point.

[0037] When the clamping force of the friction ring 120 needs to be applied by the cam 122 in conjunction with the second spring 121, the operator presses the positioning plate 1222 on side b to compress the third spring 1223, which allows the shift lever 1224 to be pulled out of the current shift hole 1225. Then, rotating the positioning plate 1222 causes the shaft 1221 and the cam 122 to rotate synchronously to the target angle. After releasing the positioning plate 1222, the third spring 1223 returns to its original position and pushes the shift lever 1224 into the corresponding shift hole 1225, achieving automatic locking. The eight annular array of shift holes 122... 5 provides eight discrete adjustment positions, each corresponding to a specific rotation angle of the cam 122, thereby corresponding to a specific compression amount of the second spring 121 and the axial clamping force value; this eight-position adjustment structure provides on-site commissioning personnel with a clear and repeatable pressure setting scheme, enabling a set of inertia wheel devices to adapt to the different requirements of friction torque under different load conditions. At the same time, the insertion and engagement of the position lever 1224 and the position hole 1225, as well as the elastic locking force of the third spring 1223, ensure that the position will not loosen on its own under long-term vibration environment.

[0038] Specifically, the shaft 1221 and the cam 122 are connected by a key; a groove 1226 is provided at the connection between the cam 122 and the shaft 1221, and the inner wall of the groove 1226 contacts the limiting key on the surface of the shaft 1221.

[0039] The keyed connection structure ensures that the shaft 1221 and the cam 122 rotate synchronously in the circumferential direction without relative slippage. This allows the cam 122 to rotate precisely to the required angle along with the shaft 1221 when the operator rotates the positioning plate 1222. There is a unique and definite correspondence between the rotation angle of the cam 122 and the compression of the second spring 121, thereby reliably ensuring the adjustment accuracy of the friction torque.

[0040] The groove 1226 provides space for the limit key to be accommodated and guided, and at the same time limits and guides the small displacement of the cam 122 along the shaft 1221, ensuring the smoothness of the axial movement of the cam 122 during the adjustment process of rotating with the shaft 1221, and avoiding adjustment failure caused by misalignment or jamming.

[0041] In use, the copper sleeve 140 is fixed to the motor shaft by the positioning pin 141, ensuring that the copper sleeve 140 is circumferentially fixed to the motor shaft and can rotate synchronously; the inertia wheel body 100, which is press-fitted with the nylon 66 friction ring 120, is sleeved on the outside of the copper sleeve 140, so that the inner cylindrical surface of the friction ring 120 and the outer cylindrical surface of the copper sleeve 140 are in contact to form a main self-lubricating friction pair; according to the desired starting sensitivity and braking holding force requirements of the on-site working conditions, the gear lever 1224 is disengaged from the current gear hole 1225 by pressing the b-side positioning plate 1222, and the b-side positioning plate 1222 is rotated to drive the shaft 122 1. After the cam 122 rotates synchronously to the target angle, the positioning plate 1222 is released. The third spring 1223 resets and pushes the gear lever 1224 into the corresponding gear hole 1225 to complete the locking. The change in the lift of the end face of the cam 122 drives the second spring 121 to generate a corresponding compression, thereby accurately setting the axial clamping force applied to the friction ring 120. After the motor is powered on, it drives the motor shaft to rotate. The power is transmitted to the copper sleeve 140 through the positioning pin 141. The self-lubricating friction pair between the copper sleeve 140 and the friction ring 120 generates a stable friction torque under the action of the set axial clamping force, driving the inertia The wheel body 100 rotates synchronously; during the start-up phase, the six counterweights 110 are in a retracted position under the pull of the first spring 111, and the system exhibits low inertia characteristics to achieve smooth start-up and eliminate torque shock and secondary spikes; as the rotational speed increases, the counterweights 110 are thrown outward against the pull of the first spring 111 under the action of centrifugal force, and the rotational inertia of the system increases, providing a stable inertial torque during operation; during the braking phase, the increased inertia is converted into an inertial torque to resist reverse rotation, ensuring reliable braking; throughout the entire operation, the lead bronze bushing 140 and the nylon 66 friction ring 120... Relying on its own self-lubricating properties to maintain a constant coefficient of friction, the local arc surface design of the inner hole of the copper sleeve 140 reduces the contact area with the motor shaft and improves heat dissipation. The synergistic effect of the two allows the friction pair to operate stably for a long time without any external lubrication maintenance, and jamming and abnormal noise are completely eliminated. On-site maintenance personnel only need to complete the pressure setting once through the eight-position cam 122 mechanism during equipment installation or maintenance. No special maintenance such as lubrication, cleaning or component replacement is required for the inertia wheel during the entire life cycle of the equipment. This fundamentally breaks through the technical bottleneck of the traditional solution that requires high-frequency maintenance every quarter.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-lubricating, maintenance-free inertia wheel device, characterized in that, include: An inertia wheel body (100) is provided with a copper sleeve (140), which is fitted and fixed on the motor shaft. A friction ring (120) is press-fitted in the inner hole of the inertia wheel body (100). The copper sleeve (140) is made of lead bronze, and the friction ring (120) is made of nylon 66. The inner cylindrical surface of the friction ring (120) and the outer cylindrical surface of the copper sleeve (140) form a main self-lubricating friction pair. An adjustment component for providing axial clamping force to the friction ring (120) is also provided in the inner hole of the inertia wheel body (100). The surface of the inertia wheel body (100) is provided with a plurality of inertia grooves (130) in a ring array. A counterweight (110) is provided in the inertia groove (130). A first spring (111) is fixedly connected to the side of the counterweight (110) away from the copper sleeve (140). The other end of the first spring (111) is fixed to the inner wall of the inertia groove (130). The counterweight (110) is provided in six parts, which are used to move and lock along the inertia groove (130) on the inertia wheel body (100) to change the rotational inertia of the system; The adjustment component includes a cam (122) disposed in the inner hole of the inertia wheel body (100), and a second spring (121) is disposed below the cam (122), the other end of the second spring (121) being fixed to the friction ring (120); The inertia wheel body (100) has adjustment slots (1227) on both sides, and a shaft (1221) is inserted between the two adjustment slots (1227). The shaft (1221) passes through the cam (122). Both ends of the shaft (1221) are fixedly connected to positioning plates (1222). One of the positioning plates (1222) is fixedly connected to a third spring (1223) on the side near the adjustment slot (1227), and the other positioning plate (1222) is fixedly connected to a gear lever (1224) on the side near the adjustment slot (1227). A gear hole (1225) is opened on the inner wall of the adjustment slot (1227) away from the side with the third spring (1223). The gear lever (1224) is inserted into the gear hole (1225). The gear lever (1224) and gear hole (1225) are arranged in a circular array with the axis of the shaft (1221) as the base point. There are eight of them.

2. The self-lubricating, maintenance-free inertia wheel device according to claim 1, characterized in that: The inner working surface of the copper sleeve (140) is designed with a partial arc surface to reduce the actual contact area with the motor shaft.

3. The self-lubricating, maintenance-free inertia wheel device according to claim 1, characterized in that: A locating pin (141) is radially inserted into the copper sleeve (140) and extends into the motor shaft.

4. The self-lubricating, maintenance-free inertia wheel device according to claim 1, characterized in that: The shaft (1221) and the cam (122) are connected by a key.

5. The self-lubricating, maintenance-free inertia wheel device according to claim 1, characterized in that: A groove (1226) is provided at the connection between the cam (122) and the shaft (1221), and the inner wall of the groove (1226) contacts the limiting key on the surface of the shaft (1221).

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