CN2679423Y - Planetary decelerator of hollow roller bearing - Google Patents

Abstract

The planetary decelerator of hollow roller bearing relates to a mechanical drive device which uses rolling bearing to slow down according to the principles of planetary gear train and friction, characterizing in that the meshing action of the gear in common planetary gear train system is replaced by the pure rolling of hollow roller on the inner and outer rings of the bearing. A plurality of cylinders which are arranged on the disc surface of the outputting bearing are inserted in the inner hole of the roller and contacted with the inner surface of the roller. When the inner ring which is fixed on the imputing bearing drives the roller to rotate, the inner surface of the roll pushes small cylinder to move so as to fulfill the outputting from the retarded motion of the outputting bearing. The inner diameter of the outer ring of the bearing is different from the outer diameter of the inner ring, which can get different drive ratio. The radial shrink ranges of the roller and the inner and the outer rings are adjusted by nut and expanding sleeve which are arranged on the imputing bearing. The value of the shrink range depends on the value of the transmitted load. The utility model is of high efficiency, large drive ratio, simple structure, small volume, light weight, low voice, low over-load protection, low slipping rate and low cost, which can replace common planetary decelerators.

Description

The hollow roller bearing planetary reducer

Technical field the utility model belongs to mechanical transmission.

The planetary reducer that background technique is traditional is to adopt various gears to realize according to the theory of engagement, and its shortcoming is that manufacturing process complexity, cost height, noise are big.According to planetary gear train principle and friction driving principle, utilize rolling bearing structure, the someone had invented several rolling bearing retarders in recent years, these several retarder major parts are to utilize the structure of ball bearing (patent announcement number: CN2037793U, 88206466.5 and 94202262.9), having a kind of is to adopt special tapered roller structure (patent announcement number: 92105351.7).Adopt the retarder of ball bearing structure, what have exists circulating power, efficient low, the structure more complicated that has, and also spherical rolling element has a common problem to be, and the sphere of some contact is easy to wearing and tearing.And use the retarder of special tapered roller structure, adopted flexible tooth between rolling element and the Internal and external cycle, thereby the manufacturing process more complicated.

The summary of the invention the purpose of this utility model, be according to planetary gear train principle and friction driving principle, utilize hollow roller bearing to realize Gear Planet Transmission, a kind of efficient height is provided, the hollow roller bearing planetary reducer that velocity ratio is big, this hollow roller bearing planetary reducer, the expansion set that conical surface cooperates is sleeved on the end journal of input shaft, the inner ring of hollow cylindrical roller bearing is sleeved on the expansion set, adjusting the hollow cylinder rolling element of this bearing and the round nut of its Internal and external cycle radial interference amount is pressed on the end face of expansion set, one end and the output shaft of disk connect firmly, and the other end is provided with one group of cylindrical body that inserts in the hollow rolling element endoporus that is mated.The rolling element of hollow roller bearing not only can be a hollow roller but also can be dark cave hollow roller.The internal diameter of the inner ring of hollow roller bearing can be columniform, also can manufacture conical.The expansion set that is used to adjust the bearing magnitude of interference can adopt the inside and outside expansion set of a cover, outer expansion set external diameter is a conical surface for the cylndrical surface internal diameter, the internal diameter of inner expension cap is a conical surface for the cylndrical surface external diameter, two conical surfaces of two expansion sets cooperatively interact, and the cylndrical surface cooperates with hollow roller bearing inner ring and input shaft respectively; Also can adopt the so inside and outside expansion set of two covers axially compressing side by side; Can also adopt an expansion set, expansion set can be that external diameter is a conical surface for the cylndrical surface internal diameter, also can be internal diameter for the cylndrical surface external diameter is a conical surface, can also be that interior external diameter is conical surface.The cylindrical part that matches with the hollow roller endoporus of hollow roller bearing can also be provided with sleeve or rolling bearing.The hollow roller bearing planetary reducer can be made single-stage, also can make multistage.Compared with prior art the utlity model has following advantage: the efficient height, velocity ratio is big, simple in structure, volume is little, in light weight, noise is little, overload protection, slip is little, cost is low; hollow roller bearing and dark cave hollow roller bearing (patent announcement number: 02247648.2) have good load-carrying properties and longer fatigue life under the same conditions than solid rolling body bearing; therefore, several rolling bearing retarders that all have been better than load-carrying properties of the present utility model and fatigue life having invented at present.

Transmission principle of the present utility model as shown in Figure 1, outer ring 3 is fixing, inner ring 1 connects firmly together with input shaft and rotates, pure rolling is made in hollow rolling element 2 relative inner rings 1 and outer ring 3, the rolling element inwall contacts with line with the cylindrical body retainer.Therefore, the velocity ratio that velocity ratio of the present utility model calculates with planetary gear train shown in Figure 2 is identical, that is:

$i_{13}=\frac{n_1}{{\mathrm{<figure-callout\; id="3"\; label="n"\; filenames="Y20042003082200111.png"\; state="\{\{state\}\}">n</figure-callout>}}_3}=1+\frac{d_3}{{\mathrm{<figure-callout\; id="1"\; label="d"\; filenames="Y20042003082200111.png"\; state="\{\{state\}\}">d</figure-callout>}}_1}$

The utility model just can obtain different velocity ratios as long as change the inner ring external diameter with the outer ring internal diameter, if by existing bearing standard design, then gear range is 2～3, if not according to existing bearing standard design, then gear range can be designed to 2～6.

Transmission efficiency of the present utility model is 0.9～0.96.

The utility model is a friction driving, and when work loads surpasses nominal torque, rolling element 2 will skid, thereby realizes overload protection.

The utility model is a friction driving, and elasticity sliding motion is an inherent characteristic, and therefore, velocity ratio is not accurate enough.

Description of drawings

Fig. 1 is the utility model transmission principle figure.

Fig. 2 is an ordinary gear Gear Planet Transmission schematic diagram.

Fig. 3 is the utility model section erection drawing.

Fig. 4 is the section erection drawing of the utility model two-stage transmission.

Fig. 5 is the section erection drawing of dissimilar interior cylindrical enclosure of the utility model and dissimilar expansion sets.

Embodiment is below in conjunction with description of drawings enforcement of the present utility model.

With reference to Fig. 3 of the utility model structure, according to the size of retarder power and velocity ratio, design and manufacture the hollow cylindrical roller bearing 9 of no retainer, expansion set 10,11.Expansion set 10,11 is contained on the input shaft 14 left end axle journals, the inner ring of hollow cylindrical roller bearing 9 is contained on the expansion set 11, round nut 6 is used for adjusting the axial displacement of expansion set 11, thereby adjust the rolling element of hollow cylindrical roller bearing 9 and the radial interference amount between the Internal and external cycle, the size of magnitude of interference is designed by retarder institute torque transmitted.A rolling bearing 12 is equipped with on the right side of input shaft 14 shaft shoulders, and axially locating is done by bearing cap 13 in the right side of rolling bearing 12, and bearing cap 13 connects with reduction case 15 by bolt 17.Adjustment packing ring 16 between bearing cap 13 and the reduction case 15 can be adjusted the axial pretightening of bearing 12.The disk 20 of the left end of cylindrical body 8 and output shaft 1 right-hand member connects firmly, and right-hand member inserts the hollow roller endoporus of bearing 9.The cylindrical body outer surface is that line contacts with the hollow roller inner hole wall, and in the time of roller and Internal and external cycle pure rolling, the roller inwall promotes cylindrical body rotates output shaft.The disk 20 of output shaft 1 right-hand member is radially being supported by the rolling bearing 5 of no inner ring.Output shaft 1 is supported by bearing 3, and bearing 3 is contained in a set of cups 4, and bearing cap 2 and a set of cups 4 connect with reduction case 15 by bolt 18.Adjustment packing ring 19 between bearing cap 2 and a set of cups 4 can be adjusted the axial pretightening of bearing 3.Prevent that with lock washer 7 round nut 6 from rotating.

Fig. 4 is the section erection drawing of the utility model two-stage transmission, and similarly the utility model can be made multistage transmission.38 is input shafts among Fig. 4, the 46th, and the output shaft of first order transmission is again the input shaft of second level transmission, the 26th, the output shaft of transmission.On the first order input shaft 38 43 is expansion sets, and hollow roller bearing 34 employings is that internal surface is conical inner ring.The inner ring of the hollow roller bearing 28 on the second level input shaft 46 also is that internal surface is conical, and axle 46 is diminished shafts with the inner ring place of matching of hollow roller bearing 28, so the inner ring of hollow roller bearing 28 can be used as expansion set again.In addition, on the cylindrical body 36 and 27 of two-stage transmission rolling bearing 35 and 29 have been installed respectively, housing washer contacts with the hollow roller inwall, thereby reduces sliding friction between cylindrical body and the hollow roller inwall.In addition, rolling bearing 35 and 29 two ends adopt circlip for shaft 30 and 37 to make axially locating.

The internal diameter of inner ring can also can manufacture conical (referring to the structure among Fig. 4) with columniform (referring to the structure among Fig. 3).

Fig. 5 is the adoptable various combination situation of expansion set that is used to adjust the radial pressure of hollow cylindrical roller and Internal and external cycle.1 is bearing inner race among the figure, the 2, the 3rd, and expansion set.What Fig. 5 (a) adopted is the inside and outside expansion set of a cover, outer expansion set external diameter is a conical surface for the cylndrical surface internal diameter, the internal diameter of inner expension cap is a conical surface for the cylndrical surface external diameter, and two conical surfaces of two expansion sets cooperatively interact, and the cylndrical surface cooperates with hollow roller bearing inner ring and input shaft respectively;

What Fig. 5 (b) adopted is that the so inside and outside expansion set of two covers is axially compressing side by side; Fig. 5 (c) usefulness be that an external diameter is the expansion set of conical surface for the cylndrical surface internal diameter, Fig. 5 (d) is that internal diameter is the expansion set of conical surface for the cylndrical surface external diameter, Fig. 5 (e) is the expansion set that interior external diameter is conical surface.

The utility model is applicable to the common mechanical transmission, can be used for replacing that the velocity ratio accuracy is not had the planetary pinion transmission of very being strict with, retarders such as small teeth number difference planet gear transmission.The utility model can be used to change various common electric machines into slowspeed machine.Also can be applicable to all kinds of electric wrenches and lapping machine etc.

Claims (6)

1. hollow roller bearing planetary reducer, it is characterized in that: conical surface cooperates expansion set (10) and (11) to be contained on the end journal of input shaft (14), the roller inner ring of hollow rolling bearing (9) is sleeved on the expansion set (11), the round nut (6) of adjusting the hollow rolling element of this bearing and its Internal and external cycle radial interference amount is pressed on the end face of expansion set (11), one end of disk (20) and output shaft (1) connect firmly, and the other end is provided with one group of cylindrical body (8) that inserts in the hollow rolling element endoporus that is mated.

2. hollow roller bearing planetary reducer according to claim 1 is characterized in that: the rolling element of hollow roller bearing (9) not only can be a hollow roller but also can be dark cave hollow roller.

3. hollow roller bearing planetary reducer according to claim 1 is characterized in that: the internal diameter of the inner ring of hollow roller bearing (9) can be columniform, also can manufacture conical.

4. hollow roller bearing planetary reducer according to claim 1, it is characterized in that: the expansion set that is used to adjust the bearing magnitude of interference can adopt the inside and outside expansion set of a cover, outer expansion set external diameter is a conical surface for the cylndrical surface internal diameter, the internal diameter of inner expension cap is a conical surface for the cylndrical surface external diameter, two conical surfaces of two expansion sets cooperatively interact, and the cylndrical surface cooperates with hollow roller bearing inner ring and input shaft respectively; Also can adopt the so inside and outside expansion set of two covers axially compressing side by side; Can also adopt an expansion set, expansion set can be that external diameter is a conical surface for the cylndrical surface internal diameter, also can be internal diameter for the cylndrical surface external diameter is a conical surface, can also be that interior external diameter is conical surface.

5. hollow roller bearing planetary reducer according to claim 1 is characterized in that: the part of the cylindrical body (8) that matches with the hollow roller endoporus of hollow roller bearing (9) can also be provided with sleeve or rolling bearing.

6. hollow roller bearing planetary reducer according to claim 1 is characterized in that: the hollow roller bearing planetary reducer can be made single-stage, also can make multistagely.

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