CN2674194Y

CN2674194Y - Rotary declerator

Info

Publication number: CN2674194Y
Application number: CNU2004200244830U
Authority: CN
Inventors: 侯周民
Original assignee: DING SHENGBAO
Current assignee: DING SHENGBAO
Priority date: 2004-01-19
Filing date: 2004-01-19
Publication date: 2005-01-26
Anticipated expiration: 2014-01-19

Abstract

The utility model discloses a rotary decelerator applied to tower-type crane rotary mechanisms, which is mainly composed of a cycloid pin wheel part and a planetary gear part. The utility model is characterized in that an output mechanism of the cycloid pin wheel is fixedly connected with an input sun wheel of the planetary gear part; an output part of the cycloid pin wheel and an input part of the planetary gear are connected into a whole. The utility model has the advantages that compared with a cycloid pin gear decelerator, the utility model solves the problem that cycloid pin gear decelerator is easy to damage at low speed stages; compared with a planet gear decelerator, the utility model solves the problem of an eccentricity A; an input shaft and an output shaft lie in a same central line without center offset between the input shaft and the output shaft, which is convenient in use a belt wheel on the input shaft; compared with a planetary gear decelerator, the decelerating ratio is obviously enlarged; the decelerating ratio in secondary decelerating can reach 652.5 at maximum, and the number of transmission stages is reduced.

Description

Rotary reducer

Technical field

The utility model relates to the rotary reducer that can be applicable in the tower crane rotation mechanism.

Background technique

At present, the speed reducer that uses in the swirl gear of tower crane has two kinds: a kind of is the twin-stage cycloidal planetary gear speed reducer, and another kind is a planet-gear speed reducer.

Wherein, cycloidal planetary gear speed reducer in use has following distinct disadvantage: one, volume is big, compares with planet-gear speed reducer, and under equal output torque situation, its volume will be twice above.Two, lack working life, fragile, its reason is as follows: be the structural representation of output shaft 1 in the cycloidal planetary gear speed reducer as shown in Figure 1, output shaft 1 output mechanism common and in the cycloidal planetary gear speed reducer is connected; As can be seen from Figure, upper bearing 2 places of output shaft 1 are thicker, and bearing 3 places in its underpart are just more tiny, in the process of tower crane revolution arm left-right rotation, the axial force that output shaft 1 is born is very big, therefore fracture defect just takes place with the junction 5 of driving gear 4 in lower bearing 3 easily, thereby has influence on the normal use of whole speed reducer.

Planet-gear speed reducer has solved the problems referred to above of cycloidal planetary gear speed reducer basically, but in use occurred new shortcoming again: one, the single-stage reduction speed ratio is little, cycloidal planetary gear speed reducer single-stage reduction speed ratio can reach 1/87, planet-gear speed reducer single-stage reduction speed ratio has only about 1/6, so the maximum deceleration of twin-stage cycloidal planetary gear speed reducer ratio can reach 1/87 * 1/87=1/7569, and the maximum deceleration of twin-stage planet-gear speed reducer ratio has only 1/6 * 1/6=1/36.Be the structure principle chart of single-stage cycloidal pin gear speed reducer as shown in Figure 2, mainly comprise: pinwheel 1, cycloid wheel 2, pivoted arm 3, input shaft 4 and output mechanism 5, output mechanism 5 is generally fixedlyed connected with output shaft; As can be seen from Figure 2, the reduction speed ratio size of cycloidal planetary gear speed reducer depends on the size of cycloid wheel 2, and promptly reduction speed ratio i equals the tooth number of cycloid wheel 2.Be the structure principle chart that the two-stage planet adds the planetary speed reducer of the flat tooth transmission of one-level as shown in Figure 3, mainly comprise: input shaft 1, output shaft 2, and some internal gears and sun gear, as can be seen from Figure 3, the single-stage reduction speed ratio is in the planet-gear speed reducer: i2=(Z4 ÷ Z3)+1, the reduction speed ratio that wants to improve the planet-gear speed reducer single-stage has only two approach, the tooth number that promptly adds big internal gear (as Z4), or the tooth number of minimizing sun gear (as Z3), but above-mentioned two measures all are unrealistic in practical operation, because: the tooth number that adds big internal gear, to obviously strengthen the radial dimension of speed reducer shell undoubtedly, promptly increase the volume of speed reducer; And reduce the tooth number of sun gear, and just reduced the radial dimension of sun gear, will reduce the bearing capacity of sun gear.So, planet-gear speed reducer will seek out bigger reduction speed ratio, just must increase transmission progression, as reduction speed ratio i is between 147～195 the time, general concrete configuration adds the flat rooted tooth transmission of one-level for the secondary planet transmission, as reduction speed ratio i is between 200～258 the time, then must be configured to the third-level planetary transmission and add the flat rooted tooth transmission of one-level.But the increase of above-mentioned transmission progression can reduce transmission efficiency, has also increased the total height of speed reducer.Two, owing to generally all dispose the flat rooted tooth transmission of one-level in the planet-gear speed reducer, this has just increased a center offset, side-play amount A as shown in Figure 3, make input shaft 1 and output shaft 2 just not on same center line, crank will appear after the general assembly, especially when the client need install belt pulley on input shaft 1, the shortcoming of its crank was just more outstanding.

Summary of the invention

The purpose of this utility model provides and a kind ofly can overcome above-mentioned cycloidal planetary gear speed reducer and the shortcoming in the planet-gear speed reducer, working life long, the more stable rotary reducer of work.

For achieving the above object, the technical solution adopted in the utility model is: described rotary reducer, mainly partly form by cycloidal-pin wheel part and planetary pinion, be characterized in: the output mechanism of cycloidal-pin wheel is fixedlyed connected with the input sun gear in the planetary pinion part, the output part and the planetary input of cycloidal-pin wheel are partly connected as one.

The utility model has the advantages that: described rotary reducer is got the advantage of cycloidal planetary gear speed reducer and planet-gear speed reducer, cast out its shortcoming of two, the slow speed turbine stage of the power that mainly withstands shocks is designed to planetary structure, stressed less important high speed level is partly born by the cycloidal-pin wheel of big retarding ratio, and the rotary reducer of Gou Chenging has possessed following advantage like this: one, solved the flimsy problem of slow speed turbine stage; Two, input shaft and output shaft are in the same center line, and do not have center offset between the two, are convenient to use on input shaft belt pulley; Three, compare the obvious reduction speed ratio that increased with planet-gear speed reducer, the reduction speed ratio maximum can reach 652.5 during double reduction, and has reduced transmission progression.

Description of drawings

Fig. 1 is the structural representation of output shaft in the cycloidal planetary gear speed reducer described in the background technique;

Fig. 2 is the structure principle chart of the single-stage cycloidal pin gear speed reducer described in the background technique;

Fig. 3 is the structure principle chart that the two-stage planet described in the background technique adds the planetary speed reducer of the flat tooth transmission of one-level;

Fig. 4 is the structure principle chart of rotary reducer described in the utility model.

Mode of execution

Below in conjunction with the drawings and specific embodiments technological scheme described in the utility model and working principle thereof are further described.

As shown in Figure 4, described rotary reducer mainly partly is made up of cycloidal-pin wheel part and planetary pinion, and wherein, cycloidal-pin wheel partly mainly comprises: input shaft 1, cycloid wheel 2, pinwheel 3, output mechanism 8 etc.; Planetary pinion partly mainly comprises: 3 planet wheels 4, internal gear 5, input sun gear 7, output gear 6 etc.Be characterized in: the output mechanism in the cycloidal-pin wheel 8 is fixedlyed connected with the input sun gear 7 in the planetary pinion part, the output part and the planetary input of cycloidal-pin wheel are partly connected as one, thereby constitute a kind of new rotary reducer, input shaft 1 is exactly the input shaft of new rotary reducer, and output gear 6 is exactly the output gear of new rotary reducer.

The advantage of the rotary reducer of said structure is: one, compare with cycloidal planetary gear speed reducer, solved the flimsy problem of slow speed turbine stage; Two, compare with planet-gear speed reducer, solved the problem of centripetal moment A, that is: input shaft and output shaft are in the same center line, and do not have center offset between the two, are convenient to use on input shaft belt pulley; Three, compare the obvious reduction speed ratio that increased with planet-gear speed reducer, the reduction speed ratio maximum can reach 652.5 during double reduction, and has reduced transmission progression.

Claims

1, rotary reducer, mainly partly form by cycloidal-pin wheel part and planetary pinion, it is characterized in that: the output mechanism of cycloidal-pin wheel is fixedlyed connected with the input sun gear in the planetary pinion part, the output part and the planetary input of cycloidal-pin wheel are partly connected as one.