CN1514147A - Cylindrical gear self locking speed reducer - Google Patents

Abstract

The self-lock function can be achieved as that a pair of composite force which is the same in size but reverse in direction and to form self-lock angle in intersecting with gear normal force is generated on gear longitudinal line of transmission mechanism by a 3K-H planetary self-lock reduction mechanism through feed back of exporting off-axis load force so automatic braking effect is realized when lifting machinery is stopped suddenly at power off by locking reducer transmission mechanism to be in one body in static force to hold lifted object at original position with no any movement.

Description

Cylindrical gears self-locking speed-down device

The present invention is the mechanical gear transmission device.

This device has self-locking and the two big functions of slowing down, and is the special-purpose driver of power jacking.It can make in the transmission system of Hoisting Machinery and not establish any braking device, and it is motionless to hang aerial stop when the lifting object is stopped immediately, produces self-actuating brake and braking effect.

The present invention makes on the basis of Epicycle train regid mechanism and 2K-H planetary mechanism.But the patented technology file of Epicycle train regid mechanism patent searching numbers 95106213.1,2K-H planetary mechanism can be retrieved machinery science and technology such as all kinds of Der Grundsatz der Maschinen, mechanical design handbook and publish the related Sections of " involute planet gear transmission " in the books and periodicals.

Task of the present invention: for improving in the mechanical self-latching technology such as the self-locking worm gear retarder, this driving mechanism worm spiral lead angle must be that the poor efficiency of unique conditional is from lock technology less than friction angle, the various transmission occasions that can not be widely used in the lifting field, stopping in the Hoisting Machinery friction catch with reliability, the Security of mechanical self-latching may be malfunctioning, the accident potential of existence.

The structure of this cylindrical gears self-locking speed-down device, shown in the attached sketch of specification: the axle center of three central gear Za, Zb, Zc and planet carrier H is all on same axes O O, and can both rotate around axes O O, planet carrier H goes up fixedly pivot pin of A, B, C three, is installed with and can rotates by Z around own axle center ₁, Z ₂, Z ₃Three sections is three seniority among brothers and sisters star-wheel Zg and planet wheel Zga, Zgb of one.Three sections Z among the three seniority among brothers and sisters star-wheel Zg ₁, Z ₂, Z ₃Take turns engagement with Zga, Zgb, Zc respectively, wherein take turns engagement with Za, Zb again by Zga, Zgb, form a kind of 3K-H planet self-locking speed-down mechanism that three planet wheels are installed on three central gears and the planet carrier that has, pack in the casing K, make central gear Za and casing K be coupled to one, seal the transmission device that forms by end cap J.

The composition of this 3K-H planet self-locking speed-down mechanism, it can resolve into by gear Zc, Z ₃, Z ₁, this train of gear engagement partly of Zga, Za, with central gear Za, central gear Zc and planet carrier H is three basic driving components, fixed carrier H transformation mechanism is made ordinary transmission, determine two central gear Za, Zc, an active, another is driven, a kind of outer gearing 2K-H negative sign mechanism that two members inputs is opposite with the output movement direction; By gear Za, Zga, Z ₁, Z ₂, this train of gear engagement partly of Zgb, Zb, with central gear Za, central gear Zb and planet carrier H are three basic driving components, fixed carrier H transformation mechanism is made ordinary transmission, determine two central gear Za, Zb, an active, another is driven, a kind of 2K-H positive sign arbor wheel self-locking mechanism that the input of two members is identical with the output movement direction.Two mechanisms make up back three central gear Za, Zb, Zc is the basic dirivig member of 3K-H planet self-locking speed-down mechanism, central gear Zc initiatively imports, central gear Zb is from action output, central gear Za is fixed, and according to the kinetic characteristic of planetary mechanism, the central gear Za of 2K-H negative sign mechanism of outer gearing this moment is fixed, central gear Zc initiatively, planet carrier H is driven, and mechanism is the planetary reduction gear transmission, velocity ratio

$i_{\mathrm{CH}}^a=i_1=\frac{\mathrm{Za}+\mathrm{Zc}}{\mathrm{Zc}};$

2K-H positive sign arbor wheel self-locking mechanism central gear Za fixes, planet carrier H active, and central gear Zb is driven, and mechanism also makes planetary reduction gear transmission, velocity ratio

$i_{\mathrm{Hb}}^a=i_2=\frac{\mathrm{Zb}}{\mathrm{Zb}-\mathrm{Za}}.$

As seen, the 3K-H planet self-locking speed-down mechanism in the cylindrical gears self-locking speed-down device is by the secondary planet reducing gear that 2K-H negative sign mechanism and another 2K-H positive sign arbor wheel self-locking mechanism of an outer gearing are formed, resultant gear ratio i=i ₁I ₂

The auto-lock function of this 3K-H planet self-locking speed-down mechanism, be structure and principle according to Epicycle train regid mechanism, be embodied in its 2K-H positive sign arbor wheel self-locking mechanism, Zc runs out of steam when the retarder driving wheel, when stopping operating, 2K-H positive sign arbor wheel self-locking mechanism central gear Zb is fed back by outer carrying force G, the peripheral force that gear is produced is passed through the engagement of planet carrier H upper planet wheel, be passed on the central gear Za that is fixed as one with casing K, all produce the active force and the reaction force of opposite sign but equal magnitude on each circumference of gear.Shown in the figure D-D, planet wheel Zga and planet wheel Z among the figure ₁Central gear Za is engaged in E point and F point, be subjected to the effect of gravity G on the central gear Zb, be passed to the E point by each planet wheel, act on the axle center B of the normal force Ng sensing planet wheel Zga on the planet wheel Zga, the reaction force that central gear Za produces acts on the axle center B that normal force Na on the planet wheel Zga also points to planet wheel Zga by the F point, because of central gear Za, planet wheel Z ₁Two equal and opposite in directions, the direction that between the frictional force NF, the NE that produce by F, E two point gearing place on the planet wheel Zga and two normal force, forms opposite Ra, Rg act on this same straight line of 2 of F, E with joint efforts, and intersect with normal force Na, Ng, form in same gear from the locking angle, therefore mechanism can be locked into one in balance under the static(al) effect.

As seen, in the cylindrical gears self-locking speed-down device driving mechanism, the working principle of 2K-H positive sign arbor wheel self-locking mechanism is on all four with the patent No. 95106213.1 patent of invention Epicycle train regid mechanisms, different is the fixedly axle center that planet wheel Zga has oneself, with outer round a on the Epicycle train regid mechanism same position, b, the floating planet gear of c three points centering relatively, it is the orientation type difference, they can both be after principal and subordinate's moving part two central gears be stressed, on the gear warp, produce and make a concerted effort, and intersect formation from the locking angle with the normal force of this gear, in static load, mechanism is locked into one.If this two mechanisms, one central gear is fixed, a central gear is driven, and planet carrier Yi Bian make two planet wheels that circumference rolls around the fixed center wheel, all is to rely on the driving link planet carrier to promote initiatively.If the 2K-H negative sign mechanism of a this self-locking mechanism and a gear outer gearing is combined into 3K-H planet self-locking speed-down mechanism, so, the planet wheel that rolls around fixed center crop rotation circumference on one side near the fixed center wheel is to rely on active center wheel Zc to drive.Like this, just improved the precision of gear movement, improved mechanism driving efficient, reduced noise, increased velocity ratio, overcome the application deficiency of single self-locking mechanism, especially this cylindrical gears self-locking speed-down device on the structure, can realize the transmission and planet wheel is a plurality of all carries on same axes O O of principal and subordinate's moving part, therefore, its type of belt drive, bearing capacity, the advantage of aspects such as transmission efficiency is self-locking worm gear Worm screw and worm-gear drive driving mechanism head and shoulders above all, becomes independently a kind of or can form multistage self-locking speed-down driver with other driving mechanism structures again, be widely applied to the various occasions in lifting field, replace traditional friction catch with the mechanical self-latching technology.

Claims (6)

1, a kind of cylindrical gears self-locking speed-down device driving mechanism, feature one: form by the 3K-H planet self-locking speed-down mechanism of fixing three planet wheel Zg, Zga, Zgb on three central gear Zc, Zb, Za and the planet carrier H.

When 2, planet carrier H upper planet wheel all carried several n=1, feature two: Zg, Zga, intermeshing three planet wheels of Zgb are installed, and they all had oneself fixing axle center A, B, C.Planet wheel Zg is one by Z ₁, Z ₂, Z ₃Three sections three row's wheels of forming one.Central gear Zc, Zb, Za are three basic dirivig members of mechanism.

3, the planet carrier H transformation mechanism that is fixed is made ordinary transmission, feature three: one can be resolved into by central gear Zc and central gear Za in mechanism, transmission by planet carrier H upper planet wheel, the outer gearing 2K-H negative sign mechanism that forms the input and output switched in opposite, and another is by central gear Zb and central gear Za, by the transmission of planet carrier H upper planet wheel, form input and output and turn to identical 2K-H positive sign arbor wheel self-locking mechanism.

4, in 2K-H positive sign arbor wheel self-locking mechanism, feature four: no matter central gear Zb or central gear Za are initiatively or driven, planet carrier H is gone up near forming a pair of equal and opposite in direction between fixing or frictional force that relative fixed central gear planet wheel two engagement places on one side produce and normal force, what direction was opposite makes a concerted effort, act on the same straight line, and form from the locking angle with this gear normal force, mechanism is locked into one in static balancing.

5, planet carrier H upper planet wheel all carry several n, can determine according to mechanism's load bearing requirements and structural requirement.

6,3K-H planet self-locking speed-down mechanism can with other driving mechanisms structure again, form multistage self-locking speed-down driver, be used for increasing velocity ratio.