Speed limiting brake
By using the elastic connection between the sliders and the boss structure design, the problem of uncontrollable slider movement in traditional speed limiting brakes during high-speed rotation is solved, achieving stable braking response and simplified structure, thus improving the reliability and lifespan of the brake.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-24
- Publication Date
- 2026-03-20
AI Technical Summary
Traditional speed limiting brakes have uncontrollable slider movement trajectories when rotating at high speeds, leading to collisions and wear between the friction pads and brake rings or braking lag. Moreover, existing technologies are complex in structure and expensive.
The design employs an elastic connection and boss structure between sliders, connecting the ends of adjacent sliders through elastic elements, and setting a boss structure and a stop edge limit on the rotating block to ensure stable movement and consistent braking response of the sliders under centrifugal force.
This technology enables rapid braking of the slider at high speeds and reduces friction at low speeds, thus avoiding energy loss, improving the reliability and lifespan of the brake, and simplifying the structural design.
Smart Images
Figure CN224017598U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to electric cylinder technical field, especially relates to a speed limiter. BACKGROUND
[0002] Speed limiter is widely used in the overspeed protection field of lifting machinery, hoisting equipment and rotating machinery, and its principle is that the centrifugal force generated by rotation drives the friction element to contact the brake ring to generate braking torque. The traditional speed limiter usually adopts a flying block or a sliding block structure, for example, a centrifugal flying block is arranged on the driving shaft, and the flying block is constrained in the radial direction by the spring pre-tightening force, and when the speed exceeds the threshold value, the flying block expands outward and rubs the brake ring to brake.
[0003] However, such design has significant defects: the sliding block or flying block only relies on the spring tension to maintain the position when rotating at high speed, resulting in uncontrollable motion trajectory. For example, when the spring is fatigued or the centrifugal force is suddenly changed, the sliding block may expand outward excessively to cause the collision and wear of the friction plate and the brake ring, or the sliding block may not contract enough to cause brake lag. In addition, the prior art attempts to remotely control the centrifugal flying block by an electromagnetic unit or add a counterweight to adjust the braking torque, but the structure is complex and the cost is high. Therefore, a purely mechanical solution is needed to ensure the motion stability of the sliding block under the action of centrifugal force and the consistency of braking response without external control, to avoid brake failure and component damage. SUMMARY
[0004] The utility model provides a speed limiter, the elastic connection between the sliding blocks and the cooperative design of the boss structure ensure the motion stability of the sliding block under the action of centrifugal force and the consistency of braking response, to avoid brake failure and component damage.
[0005] To solve the above technical problems, the utility model adopts the technical scheme: a speed limiter, comprising a brake core and a brake ring coaxially arranged outside the brake core, the brake core comprises: a rotating block, at least two sliding blocks uniformly arranged on the circumferential side of the rotating block, the rotating block has a boss structure at the position between the end portions of the adjacent two sliding blocks, and the end portions of the adjacent two sliding blocks are connected through an elastic member; the outer side curve of the sliding block is provided with a friction plate for friction with the inner side curve of the brake ring.
[0006] The above-mentioned speed limiter, the elastic member is a tension spring, the end portion of the sliding block is integrally provided with a connecting lug, and the end portion of the tension spring is hung in the first hanging hole of the connecting lug.
[0007] The connecting lug is detachably connected with an adjusting lug, a long connecting hole is formed in the connecting lug, the adjusting lug is installed on the long connecting hole through a bolt, a second hanging hole is formed in the adjusting lug, the second hanging hole is coincided with the first hanging hole, and the end of the tension spring is hung in the second hanging hole.
[0008] The end portion of the rotating block is provided with a stop edge, and the stop edge is used for limiting the axial movement of the sliding block.
[0009] The stop edge is in a ring structure.
[0010] The stop edge is detachably installed on the boss structure.
[0011] The outer side curve of the rotating block has a gap table, the inner side curve of the sliding block is attached to the gap table, and a gap exists between the gap table and the outer side curve of the rotating block.
[0012] Compared with the prior art, the utility model has the following advantages:
[0013] 1. Self-adaptive braking control: when the rotating speed is high, the centrifugal force pushes the sliding block to move outward to rub the braking ring, realizing rapid response braking; when the rotating speed is low, the elastic member pulls back the sliding block to reduce friction, avoiding energy loss.
[0014] 2. Improve reliability and service life: the boss structure limits the movement range of the sliding block in the circumferential direction, preventing the sliding block from being stuck or overloaded; the uniform distribution of the sliding block ensures the balance of the friction force, reducing local wear.
[0015] 3. Simplify the structure: the elastic member is directly connected to the end portion of the adjacent sliding block, saving additional fixing points, and easy to assemble and maintain.
[0016] 4. Braking performance adjusting mechanism: a strip-shaped hole is formed in the connecting lug, the adjusting lug can adjust the installation position through the strip-shaped hole, the spring has different locking forces under different installation positions of the adjusting lug, and the intervention rotating speed and the speed limiting torque of the speed limiting brake are adjusted by changing the locking force.
[0017] The technical scheme of the utility model will be further described in detail below with reference to the drawings and embodiments. DRAWINGS
[0018] Figure 1 It is a structural schematic view of the utility model.
[0019] Figure 2 It is a structural schematic view of the brake core.
[0020] Figure 3 It is a side view of the brake core.
[0021] Figure 4 A schematic diagram of the brake core after removing one side flange and slider.
[0022] Explanation of reference numerals in the attached figures:
[0023] 1—Brake ring; 2—Rotating block; 3—Slider;
[0024] 4—Boss structure; 5—Tension spring; 6—Connecting lug;
[0025] 7—Adjusting ear piece; 8—Elongated connecting hole; 9—First mounting hole;
[0026] 10—Side guard; 11—Gap platform. Detailed Implementation
[0027] like Figure 1 — Figure 4 As shown, a speed limiting brake includes a brake core and a brake ring 1 coaxially disposed on the outside of the brake core. The brake core includes a rotating block 2 and at least two sliders 3 evenly distributed on the circumference of the rotating block 2. The rotating block 2 has a boss structure 4 at the position between the ends of two adjacent sliders 3. The ends of two adjacent sliders 3 are connected by an elastic element. The outer curved surface of the slider 3 is provided with a friction pad for friction with the inner curved surface of the brake ring 1.
[0028] In actual implementation:
[0029] Manufacturing details: The rotating block 2 is cylindrical (material such as steel or aluminum alloy), with evenly spaced grooves on its circumference for mounting the slider 3; the slider 3 is an arc-shaped metal block (e.g., cast iron), with at least two (typically four to balance centrifugal force), and friction pads (such as carbon fiber or ceramic composite material) bonded to its outer curved surface. The boss structure 4 protrudes from the surface of the rotating block 2 (e.g., welded or integrally cast), with a moderate height to limit the range of movement of the slider 3. The elastic element can be a compression spring or a tension spring 5, installed at a pre-set connection point at the end of the adjacent slider 3.
[0030] In actual installation, the brake core is fixed to the rotating shaft (such as the motor shaft), and the brake ring 1 is fixed inside the housing. For example: when the industrial fan system is running, the shaft speed increases → centrifugal force causes the slider 3 to slide outward → the friction plate contacts the inner surface of the brake ring 1 → achieving deceleration; when the shaft speed decreases, the elastic element contracts and pulls the slider 3 back → the boss prevents inward displacement → maintaining a stable clearance. Implementation is simple; the slider 3 and spring can be assembled manually or by machine.
[0031] Those skilled in the art can complete the component through standard machining (such as machining the rotating block 2 on a lathe and stamping the slider 3); the spring connection point is designed at the end of the slider 3 for easy tension adjustment. For example, during testing, it is only necessary to rotate the brake core to observe the degree of outward movement of the slider 3 to ensure uniform friction.
[0032] In this embodiment, the elastic member is a tension spring 5, and the end of the sliding block 3 is integrally provided with a connecting lug 6. The end of the tension spring 5 is hung in the first hanging hole 9 of the connecting lug 6.
[0033] The tension spring 5 is a common component, easy to purchase and replace. The connecting lug 6 is integrally designed to reduce the risk of joint failure and ensure stable tension of the tension spring 5. The hanging hole allows quick hooking of the tension spring 5, shortening the assembly time.
[0034] In actual implementation:
[0035] The connecting lug 6 is integrally formed with the sliding block 3 (for example, the lug structure is reserved when the sliding block 3 is cast), avoiding the risk of loose welding; the lug is a small plate with a first hanging hole 9 drilled. The tension spring 5 is selected as a standard component (such as a carbon steel spring), with hooks at both ends.
[0036] During assembly, the hook at one end of the tension spring 5 is inserted into the first hanging hole 9 of the lug of the sliding block 3A, and then stretched to hook into the lug hole of the adjacent sliding block 3B. During maintenance of the speed limiter brake, the hanging hole can be directly observed, and if the tension spring 5 is loose, a new tension spring 5 can be easily replaced without disassembling the entire device.
[0037] In actual installation, the technician can hook the tension spring 5 into the hole with pliers; the first hanging hole 9 is optimally positioned in the middle of the end of the sliding block 3 to avoid interference with other components. For example, the sliding block 3 and the connecting lug 6 are formed in one step using a stamping die during mass production.
[0038] In this embodiment, an adjusting lug 7 is detachably connected to the connecting lug 6, a long connecting hole 8 is formed in the connecting lug 6, the adjusting lug 7 is installed on the long connecting hole 8 through a bolt, a second hanging hole is formed in the adjusting lug 7, the second hanging hole coincides with the first hanging hole 9, and the end of the tension spring 5 is hung in the second hanging hole.
[0039] By moving the position of the adjusting lug 7 on the long connecting hole 8, the hanging point position of the second hanging hole is changed, thereby adjusting the tension strength of the tension spring 5 to adapt to different speed requirements.
[0040] The detachable design allows quick replacement of the worn adjusting lug 7 or tension spring 5 without replacing the entire brake core.
[0041] During manufacturing: the connecting lug 6 is pre-processed with a long hole (such as a 10mm long slot), and the adjusting lug 7 is matched with a second hanging hole drilled; the two are connected by a bolt (such as an M4 screw). The bolt is tightened to fix the position of the adjusting lug 7, and when loosened, it can slide along the long hole.
[0042] During installation, the adjusting tab 7 is temporarily fixed to the long hole with a bolt → make sure the second hanging hole is aligned with the first hanging hole 9 → hang the tension spring 5. The long hole design allows continuous adjustment (fine adjustment increment of about 1mm), easy to implement. Only need to remove the bolt and replace the adjusting tab 7 during maintenance, low cost.
[0043] In this embodiment, the end of the rotating block 2 is provided with a stop edge 10 on both sides, which is used to limit the axial movement of the sliding block 3.
[0044] The stop edge 10 prevents the sliding block 3 from shifting in the axial direction (the direction of the rotating shaft), ensuring that the friction plate always maintains parallel contact with the inner side of the brake ring 1, avoiding oblique grinding or vibration.
[0045] After limiting, the sliding block 3 moves only radially (outward), reducing energy loss.
[0046] In implementation, the stop edge 10 is made into a plate or ring structure (material such as steel plate), and is installed at both ends of the rotating block 2 (such as fixed through screw holes). After the stop edge 10 is assembled to the end of the rotating block 2, the sliding block 3 can only slide outward within the space defined by the stop edge 10. In implementation, the position of the stop edge 10 can be adjusted to adapt to sliding blocks 3 of different sizes.
[0047] In this embodiment, the stop edge 10 is a ring structure.
[0048] The ring-shaped stop edge 10 covers the entire circumference, providing 360-degree uniform limiting and enhancing overall rigidity to prevent local deformation. The ring design can cooperate with the brake ring 1 to reduce dust entry and prolong service life.
[0049] The stop edge 10 is made into a continuous ring (such as punched or turned into a ring), and is installed by being sleeved on the end of the rotating block 2 and fastened with screws. For example, a plurality of evenly distributed screws are used to fix the ring.
[0050] The ring-shaped stop edge 10 wraps all the sliding blocks 3, forming a complete barrier during braking. In implementation, lightweight materials (such as aluminum rings) are selected to reduce inertia. The ring structure is a standard part that is easy to obtain; technicians can select rings according to size without additional processing.
[0051] In this embodiment, the stop edge 10 is detachably installed on the boss structure 4.
[0052] The detachable design allows the stop edge 10 to be quickly removed, exposing the sliding block 3 for cleaning or replacement without the need to disassemble the brake as a whole. After the stop edge 10 is removed, it is convenient to adjust or replace it with other sizes.
[0053] The boss structure 4 is pre-provided with threaded holes or clamping slots, and the stop edge 10 is correspondingly machined with mounting holes; fixed with bolts or quick buckles. For example, the bolt passes through the hole of the stop edge 10 and is screwed into the screw hole on the boss.
[0054] In actual use, the bolts are loosened by a wrench during regular maintenance, the blocking edge 10 is removed, and the state of the sliding block 3 is checked.
[0055] In this embodiment, the rotating block 2 has a gap platform 11 on the outer curved surface, and the inner curved surface of the sliding block 3 is attached to the gap platform 11, and there is a gap between the inner curved surface of the sliding block 3 and the outer curved surface of the rotating block 2.
[0056] The gap keeps a small gap (non-contact) between the inner curved surface of the sliding block 3 and the rotating block 2 at low speed or at rest, prevents the sliding block 3 and the rotating block 2 from sticking, and allows thermal expansion and contraction to avoid deformation and resulting failures.
[0057] The gap platform 11 is a raised step (e.g. milled or cast) on the surface of the rotating block 2 (height 0.5-1mm), and the inner curved surface of the sliding block 3 is attached to the gap platform 11 to form a radial gap. The size of the gap (e.g. 0.2mm) is controlled by the height of the step.
[0058] The above is only a preferred embodiment of the present application, and does not limit the present application in any way. Any simple modification, change, and equivalent structural change made according to the technical essence of the present application to the above embodiment are still within the protection scope of the technical solution of the present application.
Claims
1. A speed-limiting brake, characterized in that, The device includes a brake core and a brake ring coaxially disposed on the outside of the brake core. The brake core includes a rotating block and at least two sliders evenly distributed on the circumference of the rotating block. The rotating block has a boss structure at the position between the ends of two adjacent sliders, and the ends of two adjacent sliders are connected by an elastic element. The outer curved surface of the slider is provided with a friction plate for rubbing against the inner curved surface of the brake ring.
2. A speed-limiting brake according to claim 1, characterized in that, The elastic element is a tension spring, and the end of the slider is integrally provided with a connecting lug. The end of the tension spring is hung in the first hanging hole of the connecting lug.
3. A speed-limiting brake according to claim 2, characterized in that, An adjusting ear is detachably connected to the connecting ear. The connecting ear has an elongated connecting hole. The adjusting ear is installed on the elongated connecting hole by bolts. The adjusting ear has a second hanging hole that overlaps with the first hanging hole. The end of the tension spring is hung in the second hanging hole.
4. A speed-limiting brake according to claim 1, characterized in that, The rotating block has flanges installed on both sides of its end, which are used to limit the axial movement of the slider.
5. A speed-limiting brake according to claim 4, characterized in that, The retaining edge has a ring structure.
6. A speed-limiting brake according to claim 5, characterized in that, The retaining edge is detachably mounted on the boss structure.
7. A speed-limiting brake according to claim 1, characterized in that, The outer curved surface of the rotating block has a gap platform, and there is a gap between the inner curved surface of the slider and the outer curved surface of the rotating block.