Meshing Mechanical Speed ​​Limiting Mechanism

A mechanical and combined technology, applied in the direction of mechanical equipment, clutches, automatic clutches, etc., can solve the problems of inconvenient use of the speed limiting mechanism of the reducer, need to replace friction plates, and poor braking effect, etc., and achieve light weight, simple structure, The effect of mitigating moments and forces

Active Publication Date: 2018-04-03
SICHUAN UNIV
7 Cites 0 Cited by

AI-Extracted Technical Summary

Problems solved by technology

At present, these reducers can achieve a deceleration with a certain transmission ratio on the basis of external power, but at the same time there are problems such as complex structure, large volume, and high cost.
[0003] At present, there are also some speed limiting mechanisms, most of which use the friction between the friction plate and the moving parts to perform deceleration control. The friction plate will no...
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Method used

[0032] The speed-limiting mechanism of the present invention can transmit the circular motion of the main shaft 1 to the eccentric gear. Before the speed-limiting mechanism works, the cylindrical torsion spring can ensure that the speed-limiting inner ring gear does not rotate synchronously with the main shaft. The speed that needs to be limited is set by setting the weight of the inner ring gear, the stiffness coefficient of the centrifugal spring and cylindrical torsion spring, and the curvature of the concave arc of the centrifugal track. When the speed is reached or exceeded, the speed limiting mechanism will work and can The eccentric gear and the speed-limiting inner ring gear are clamped by meshing, and its transmission ratio is equal to 1, and the speed is mainly reduced by the momentum theorem. The fixed cylindrical torsion spring 6 on the speed-limiting ring gear 4 can ensure the quick...
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Abstract

The invention provides an engaging type mechanical speed limiting mechanism. The engaging type mechanical speed limiting mechanism comprises a box, a speed limiting inner gear ring and an eccentric gear, wherein the speed limiting inner gear ring and the eccentric gear are installed in the box. The speed limiting inner gear ring is installed on a spindle in a clearance fit mode, the spindle is sleeved with a cylindrical torsional spring for fixedly connecting the box and the inner gear ring, and flat keys are symmetrically machined on the segment, connected with the eccentric gear, of the spindle for installation of the eccentric gear. A centrifugal rail is machined in the eccentric gear, and key slots matched with the flat keys of the spindle are formed in the centrifugal rail. The interior of a centrifugal spring penetrates through the lower flat key of the spindle to be kept in contact with the lower half portion of the outer surface of the spindle, a metal blocking piece abuts against the eccentric gear, and the end face of the metal blocking piece is welded to the spindle. When the rotating speed of the spindle is too high, the eccentric gear is in an eccentric state to be engaged and clamped with the inner gear ring to drive the inner gear ring to rotate together so as to reduce the speed. The engaging type mechanical speed limiting mechanism is suitable for occasions where the rotating speed is limited but not required to be fixed in engineering drive, the speed reduction process is rapid and reliable, the structure is simple, and use is convenient.

Application Domain

Self acting brakesCoupling-brake combination +1

Technology Topic

EngineeringSpeed limit +1

Image

  • Meshing Mechanical Speed ​​Limiting Mechanism
  • Meshing Mechanical Speed ​​Limiting Mechanism
  • Meshing Mechanical Speed ​​Limiting Mechanism

Examples

  • Experimental program(1)

Example Embodiment

[0028] The content of the present invention will be further described with reference to the accompanying drawings.
[0029] like figure 2 As shown, the meshing speed-limiting mechanism of the present invention includes a main shaft 2, an eccentric incomplete gear 5, a speed-limiting inner gear 4, a centrifugal spring 1, a cylindrical torsion spring 6 and a metal baffle 7, wherein the main shaft 2 is symmetrically processed with Flat key, the eccentric gear 5 is connected to the main shaft through the key on the main shaft, the metal baffle 7 is welded on the main shaft close to the end face of the eccentric gear, and the two ends of the torsion spring 6 are respectively fixed on the outer casing 3 and the speed-limiting inner gear ring 4 and fit on the spindle.
[0030] The meshing speed limiting mechanism is input by the main shaft, the eccentric gear is not eccentric at low speed or within the allowable working speed, and the input speed is directly transmitted to the eccentric gear through the main shaft. figure 1 Shown is the working state of the meshing speed limiting mechanism of the present invention within the normal working speed range.
[0031] When the rotation speed is too high, the eccentric gear relies on centrifugal force to overcome the resistance of the centrifugal spring, and the extrusion force of the concave arc of the centrifugal track occurs eccentrically and meshes with the speed-limiting inner gear ring and gets stuck, thereby driving the inner gear to overcome the cylindrical torsion spring together. Resistance to rotation, generally, the two together will not rotate more than one circle. figure 2 Shown is the working state of the eccentric gear when it is eccentric.
[0032] The speed-limiting mechanism of the present invention can transmit the circular motion of the main shaft 1 to the eccentric gear. Before the speed-limiting mechanism works, the cylindrical torsion spring can ensure that the speed-limiting inner gear ring does not rotate synchronously with the main shaft. By setting the weight of the ring gear, the stiffness coefficient of the centrifugal spring and the cylindrical torsion spring, and the curvature of the concave arc of the centrifugal track, the speed that needs to be limited is set. When the speed is reached or exceeded, the speed-limiting mechanism works and can be The eccentric gear and the speed-limiting inner gear are locked by meshing, and the transmission ratio is equal to 1, which mainly relies on the momentum theorem to reduce the speed. The cylindrical torsion spring 6 fixed on the speed-limiting inner gear 4 can ensure the rapidity of speed-limiting, increase the resistance, and enhance the speed-limiting effect.
[0033] The speed-limiting mechanism of the present invention can provide a stable counterweight required for deceleration when the upper limit of the critical speed is reached, and realize flexible speed-limiting by means of torsion spring resistance at the same time of deceleration. The weight of the eccentric gear is increased by meshing and clamping the eccentric gear with the speed-limiting ring gear, which makes the deceleration reliable and stable. After the speed is reduced to the allowable range, the centrifugal force of the eccentric gear drops rapidly, the centrifugal spring pushes the gear back to the initial position, and the speed-limiting process ends. In addition, the present invention also has beneficial effects such as high manufacturability, simple structure and low cost.

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Description & Claims & Application Information

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