CN2398478Y - Dense bead cycloid steel ball speed reducer - Google Patents

Abstract

The utility model relates to a dense bead cycloid steel ball speed reducer comprising an eccentric shaft and a balance block which are arranged on an input shaft; an eccentric disk which is provided with an inner cycloid roller path is arranged out of the eccentric shaft; one side of the eccentric disk is connected with an inner side surface of the end cover by an anti-rotation mechanism and is connected into integration with an output shaft, and a side surface is provided with an output disc of an outer cycloid roller path; steel ball gears composed of steel balls are densely arranged between two roller paths of the eccentric disk and the output disk to form engagement transmission. A big comprehensive contact curvature radius and a small sliding ratio are favorable to improve and to keep transmission accuracy and service life. Adjusting tightly a cushion applies pre-pressure to transmission, ensures engagement transmission of multiple teeth, eliminates transmission return difference, and has big transmission ratio. The utility model can be used in precise mechanical transmission devices.

Description

Close pearl cycloidal ball retarder

The utility model relates to other friction gearings of conveying rotary motion, is a kind of cycloidal ball retarder.

The transmission device that is applied to elaborate servo mechanisms such as robot, precision machine tool, Aero-Space, fine measuring instrument has required high transmission accuracy, high transmission stiffness, and velocity ratio is big, the transmission efficiency height, characteristics such as volume is little, and is in light weight, and the rotary inertia of transmission return difference and rotating component is little.Cycloid pinwheel planetary gear transmission system in the existing driving mechanism, though have many advantages, processed complex and transmission accuracy are not high, the transmission return difference is big; It is big that worm drive has a velocity ratio, but transmission efficiency is low; Harmonic driving can satisfy above-mentioned requirements preferably, but flexbile gear material requirements height and life-span are shorter.

The purpose of this utility model is: adopt the eccentric shaft of one section of input shaft outer install to have the eccentric disc of hypocycloid raceway and fuse with output shaft have the output disc of epicycloid raceway, the intensive close pearl cycloidal ball retarder that transmission steel ball composition is housed can satisfy the demanding transmission device of above-mentioned precision optical machinery on the raceway of two dishes.

For achieving the above object, the technical solution adopted in the utility model is: it comprises the eccentric shaft on the one section input shaft that is contained in end cap and the casing, setting-up eccentricity spindle balance piece on the eccentric shaft, the outer eccentric disc that has the hypocycloid raceway of installing of eccentric shaft, be connected with anti-rotation mechanism between eccentric disc one side and rubbing surface of end cover, the output disc that fuses with output shaft and have the epicycloid raceway in the side is arranged, the intensive transmission steel ball that is equipped with is formed steel ball gear between two raceways of eccentric disc and output disc, and inside and outside cycloid raceway and transmission steel ball form engagement driving.

The utility model is compared with background technique, and the useful effect that has is:

1. the steel ball gear of steel ball composition periodic duty because the highi degree of accuracy of employing dense arrangement on the same circumference of inside and outside cycloid raceway hardened can significantly reduce wearing and tearing and help keeping transmission accuracy;

2. inside and outside cycloid raceway is curtate cyclod list circular arc or duplex circular ares profile race, and to contact radius of curvature big with steel ball gear comprehensive, and sliding ratio is little, to improving and keeping rotation precision and life-span very favourable;

3. it is stressed that inside and outside cycloid raceway and steel ball all can contact, and steel ball is a dense arrangement, can all participate in contact, and contact-ratio can reach 100%, the mesh stiffness height, and bearing capacity is big;

4. by adjusting spacer thickness, transmission is applied certain precompression, can guarantee multiple tooth engagement driving, improve transmission accuracy and transmission stiffness, and eliminate the transmission return difference, velocity ratio is 5～50.

Therefore, the utility model can be promoted the use of in the demanding transmission devices of precision optical machinery such as robot, precision machine tool, Aero-Space.

Description of drawings:

Fig. 1. structural representation of the present utility model;

Fig. 2. cross skateboard figure;

Fig. 3. cross slide plate A is to view;

Fig. 4. cross slide plate B is to view;

Fig. 5. the retainer sectional view;

Fig. 6. a kind of structural drawing of retainer;

Fig. 7. the another kind of structural drawing of retainer;

Fig. 8. the steel ball gear structural drawing;

Fig. 9. steel ball gear A-A is to view;

Figure 10. steel ball gear B-B is to view;

Figure 11. the inside and outside cycloid raceway of single circular arc C-C sectional view;

Figure 12. the inside and outside cycloid raceway of two circular arcs C-C sectional view.

Below in conjunction with accompanying drawing, give details of the present utility model by description to embodiment.

Close pearl cycloidal ball retarder as shown in Figure 1, it comprises the eccentric shaft 17 on the one section input shaft 11 that is contained in end cap 13 and the casing 19, setting-up eccentricity spindle balance piece 15 on the eccentric shaft 17, the eccentric shaft 17 outer eccentric discs 16 that have hypocycloid (or epicycloid) raceway of installing, be connected with anti-rotation mechanism between eccentric disc 16 1 sides and end cap 13 inner side surfaces, the output disc 18 that fuses with output shaft 22 and have epicycloid (or hypocycloid) raceway in the side is arranged, the intensive transmission steel ball 6 that is equipped with is formed steel ball gear between two raceways of eccentric disc 16 and output disc 18, in, epicycloid raceway and transmission steel ball 6 form engagement driving.Output disc 18 is bearing in the bearing 9 in casing 19 holes, input shaft 11 is bearing in the bearing 12 and the bearing 8 in output disc 18 holes of end cap 13, eccentric shaft 17 on the input shaft 11 is supported with in the bearing 7 in eccentric disc 16 holes, and end cap 13 tightens up with casing 19 usefulness screws 14.Be equipped with between the shoulder face in casing 19 end faces and the gland 21 and adjust pad 20, compress, apply certain precompression, guarantee multiple tooth engagement driving by gland 21 interior edge faces, the bearing 10 on output shaft 22,18 pairs of transmissions of output disc with gland 21.

Above-described anti-rotation mechanism is the cross sled mechanism, as Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, it is included in and parallelly on the side of cross slide plate 3 has the one group of group leader's groove 23 that can put anti-rotation steel ball 1, on the another side of cross slide plate 3, have another group leader groove 24 perpendicular with elongated slot 23, have on end cap 13 inner side surfaces and cross slide plate 3 one side views, the position, the identical elongated slot of direction, anti-rotation steel ball 1 usefulness retainer 2 location, have on eccentric disc 16 1 sides and cross slide plate 3 another side shapes, the position, the identical elongated slot of direction, anti-rotation steel ball 4 usefulness retainers 5 location.

As Fig. 5, Fig. 6, shown in Figure 7, can match with the anti-rotation steel ball 1,4 in being installed in cross slide plate 3 grooves respectively in the hole that has on the retainer 2,5, and the hole count on the retainer 2,5 and the distribution in hole are by the steel ball decision of being placed in cross slide plate 3 grooves.

It is d that steel ball gear adopts diameter _bStandard transmission steel ball 6 dense arrangement be R at radius _sCircumference on, steel ball is counted Z _bWith the steel ball gear radius R _sThe pass be: $R_s=\frac{d_b}{2\mathrm{Sin}(\mathrm{\π}/Z_b)}$

As Fig. 8, Fig. 9, shown in Figure 10, be hypocycloid raceway on the structural drawing eccentric disc 16 of steel ball gear and the epicycloid raceway on the output disc 18, its cross section is curtate cyclod list arc raceway (as shown in figure 11) or curtate cyclod duplex circular ares profile race (as shown in figure 12).The protruding tooth number Z of hypocycloid raceway _b+ 1 protruding tooth number Z than epicycloid raceway _bMore than-1 2 teeth, steel ball 6 number Z _bFor the epicycloid raceway projection number of teeth adds 1.

Curtate hypocycloid raceway central party formula is:

X＝R _sCOS+aCOSZ _b

y＝R _sSin-aSinZ _b

Curtate epicycloid raceway central party formula is:

X＝R _sCOS-aCOSZ _b

y＝R _sSin-aSinZ _b

Curtate ratio: $K=\frac{a\·Z_b}{R_s}$

In the above equation:

Building X, X-raceway center mark

Y-raceway center y coordinate

R _s-steel ball gear radius

Z _b-steel ball number

-parameter

A-epicycloid raceway is with respect to the throw of eccentric of steel ball gear or the hypocycloid raceway throw of eccentric with respect to steel ball gear

K-curtate ratio (span is 0.35～0.75)

Working principle of the present utility model is as follows: with shown in Figure 1, when input shaft 11 is done rotation motion, the eccentric shaft 17 that links to each other with input shaft 11 turns round synchronously, by eccentric shaft bearing 7 center of eccentric disc 16 being done with the eccentric amount e is the circular movement of radius, anti-rotation mechanism has limited eccentric disc 16 and has only done translation and do not do rotation motion around self axis, by the engagement of eccentric disc 16, promote output disc 18 and do the reversed turning motion around output shaft 22 with output disc 18.

Claims (5)

1. close pearl cycloidal ball retarder, it is characterized in that: it comprises the eccentric shaft [17] on the one section input shaft [11] that is contained in end cap [13] and the casing [19], eccentric shaft [17] is gone up setting-up eccentricity spindle balance piece [15], the outer eccentric disc [16] that has the hypocycloid raceway of installing of eccentric shaft [17], be connected with anti-rotation mechanism between eccentric disc [16] one sides and end cap [13] inner side surface, the output disc [18] that fuses with output shaft [22] and have the epicycloid raceway in the side is arranged, the intensive transmission steel ball [6] that is equipped with is formed steel ball gear between two raceways of eccentric disc [16] and output disc [18], in, epicycloid raceway and transmission steel ball [6] form engagement driving.

2. close pearl cycloidal ball retarder according to claim 1, it is characterized in that: described anti-rotation mechanism is the cross sled mechanism, it is included in and parallelly on the side of cross slide plate [3] has the one group of group leader's groove [23] that can put anti-rotation steel ball [1], on the another side of cross slide plate [3], have and another perpendicular group leader's groove [24] of elongated slot [23], have on end cap [13] inner side surface and cross slide plate [3] one side views, the position, the identical elongated slot of direction, anti-rotation steel ball [1] is located with retainer [2], have on eccentric disc [16] one sides and cross slide plate [3] another side shape, the position, the identical elongated slot of direction, anti-rotation steel ball [4] is located with retainer [5].

3. close pearl cycloidal ball retarder according to claim 1 is characterized in that: it is d that described steel ball gear adopts diameter _bStandard transmission steel ball [6] dense arrangement be R at radius _sCircumference on, steel ball nodule number Z _bWith the steel ball gear radius R _sThe pass be: $R_s=\frac{d_b}{2\mathrm{Sin}(\mathrm{\π}/Z_b)}$

4. close pearl cycloidal ball retarder according to claim 1 is characterized in that: the epicycloid raceway on hypocycloid raceway on the described eccentric disc [16] and the output disc [18], its cross section are curtate cyclod list arc raceway or curtate cyclod duplex circular ares profile race.

5. close pearl cycloidal ball retarder according to claim 1 is characterized in that: the protruding tooth number Z of hypocycloid raceway _b+ 1 protruding tooth number Z than epicycloid raceway _bMore than-1 2 teeth, steel ball [6] number Z _bFor the epicycloid raceway projection number of teeth adds 1.

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