CN2079233U - Less gear difference chain type planet speed reducer - Google Patents

Abstract

The utility model relates to a less gear difference chain type planet speed reducer. A 2K-H type less gear difference transmission scheme is composed of double rows of bush roller chains, planet chain wheels, fixed center chain wheels, crank shafts, output center chain wheels, balance blocks, buffering pieces, etc. The planet chain wheels and the center chain wheels are cut by standard gear cutters with negative large displacement range or are cut by standard chain wheel hobs. Because the bush roller chains, the chain wheels, etc. are used as basic members and the buffering pieces are arranged among the planet chain wheels and especially the flexibility of chains makes the transmission have rigidity and flexibility; buffer action is decreased. Meanwhile, the utility model has the advantages of simple processing, compact structure and low cost, and is capable of being widely applied to outdoors and various large reduction ratio speed reduction transmission occasions with more dust.

Description

Less gear difference chain type planet speed reducer

The utility model relates to the technical field with the endless flexible element conveying rotary motion, a kind of chain type planetary reducer.

In the existing technical field, generally there are following two kinds with chain as the large speed ratio retarder of transmission component, a kind of as Chinese patent (CN86202815U, December 3 86 year day for announcing) disclosed planet chain reduction device, this retarder is because chain is not to be fixed on the central gear, and there is relative movement, its transmission remains general chain-driven form, this drive chain is under big load effect, reduce working life, owing to structural reason, can not on planet wheel, adopt rolling bearing simultaneously.Another kind of as the few tooth difference tooth planetary speed reducer of the disclosed chain of Chinese patent (March 23 1988 CN87208342U day for announcing), the pin gear that replaces cycloid pinwheel planetary gear transmission system with Chain Gear ring, replaced the prolate epicycloid planet wheel with the circle-arc tooth planet wheel, but the circle-arc tooth processing difficulties, productivity is low, cost is high.In industrial production, require big retarding than retarder satisfy from heavy and light, volume is little, efficient is high, performance is good, bearing capacity is strong, the life-span is low, simple in structure and be easy to process these requirements, up to this point, still there is not a kind of practicable this type of retarder.

The purpose of this utility model is in order to solve more existing problems in the prior art field, to design and manufacture the pin tooth that the double bush roller chain of employing standard substitutes the cycloidal-pin wheel transmission, adopting the chain type planetary reducer of the few tooth difference transmission of 2K-H type.

It mainly comprises few tooth difference chain type star retarder of the present utility model: double bush roller chain (as shown in Figure 1 and Figure 2), planet sprocket, center sprocket wheel, bent axle, output sprocket, wherein planet sprocket system is made up of fixed center sprocket wheel 4, output center sprocket wheel 10, planet sprocket 6,8.Planet sprocket 6,8 is enclosed within respectively on two eccentric cylinders of bent axle 3, planet sprocket 6,8 sides respectively be enclosed within bent axle 3 in the middle of eccentric cylinder on shock absorber 7,15 be connected, eccentric balancing blocks 2 fuses with bent axle and places among the shock absorber 7,15, double bush roller chain 5 is connected with fixed center wheel 4 with planet sprocket 6 respectively, and double bush roller chain 9 is connected with the output center sprocket wheel 10 of center fixation at output shaft 12 with planet sprocket 8 respectively.

Description of drawings:

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

Fig. 2, structural scheme of mechanism of the present utility model.

As shown in Figure 1 and Figure 2, bent axle 3 is an input shaft, and fixed center sprocket wheel 4 is welded on the end cap, and end cap and frame 11 connect firmly.Two planet sprockets 6,8 are enclosed within respectively on the bearing 16,13, and with 7,15 riveted joints of rivet 1,14 and buffer disc, eccentric balancing blocks 2 is installed in the buffer disc 7,15 and is welded on the bent axle 3, two buffer disc 7,15 usefulness screws connect firmly, chain 5,9 is enclosed within on fixed center sprocket wheel 4 and the output center sprocket wheel 10, its joint number just in time equals teeth number of sprocket, output center sprocket wheel 10 and output shaft 12 welding.Planet sprocket and center sprocket wheel adopt standard involute gear hob cutting or the slotting of standard involute gear gear shaper cutter, negative big displacement and tangent modification method are adopted in cutting, utilizing the prolate involute optimization of negative big displacement cutting to substitute equidistant curve with the prolate epicycloid of roller planet sprocket phase conjugate, is a kind of approximate conjugation engagement driving therefore.And can adopt the roller seating space arc section and the flank profil active section of standard sprocket with standard sprocket hobboing cutter cutting planet sprocket and center sprocket wheel on the other hand, and cut the top circle segmental arc, promptly become two circular arcs, one straight line profile of tooth, also promptly control tooth depth and prevent to interfere and jump tooth.The sprocket wheel of actual proof employing standard Involute Gear Sharper Cutter slotting has good performance.

Double bush roller chain adopts standard piece, and the specification size is looked into handbook by transmitted power and determined that the chain joint number is identical with the central gear number of teeth.All sprocket wheels are by negative big displacement of involute hob and tangent modification cutting, and buffer disc 15 is stamped to form by cold-reduced sheet.Few 1～3 tooth of the number of teeth of the gear ratio central gear of planet wheel.Planet wheel is sleeved on the radial ball bearing outer ring, and bearing housing is contained on the axle, fixed center wheel and frame welding, output center wheel and output shaft welding, eccentric balancing blocks and bent axle welding.Each tooth number can be according to the utility model retarder velocity ratio relation

(n ₁-n _H)/(n ₄-n _H)=(Z ₂Z ₄)/(Z ₁Z ₃) draw

In the formula: n ₁---fixed center sprocket wheel 4 rotating speeds, Z ₁Be the number of teeth;

n ₄---output center sprocket wheel 10 rotating speeds, Z ₄Be the number of teeth;

n _H---bent axle 3 rotating speeds;

Z ₂---be planet sprocket 6 numbers of teeth;

Z ₃---be planet sprocket 8 numbers of teeth.

Because the utility model n ₁=0

So $\frac{n_H}{n_4}=\frac{1}{1-\frac{Z_1{Z}_3}{Z_2{Z}_4}}$

According to above formula, work as Z ₁=26～34, Z ₄=26～34

Z ₃=25～33, Z ₂=25～33 o'clock

Can get i=38～1,225 78 kind of velocity ratio.

By the above, the part that processes is assembled, just form few tooth difference chain type planetary reducer of the present utility model.

The utility model compared with prior art also has following advantages:

1. because the selection standard cutter is processed at machine tool, and good manufacturability has overcome the same pitch of common sprocket wheel, a kind of number of teeth need be with one the shortcoming of cutter.

Since with bush roller chain, sprocket wheel etc. as basic building block, shock absorber is housed again between planet sprocket, particularly the flexible of chain makes transmission have hard and soft having both, the vibration reduction and cushioning effect.

3. simple in structure, compactness, from heavy and light, volume is little, and requirement on machining accuracy is not high, and reduction speed ratio is big, and cost is cheap especially etc., can be widely used in the occasion of the various big retardings of outdoor and many dusts than gearing down.

Claims (2)

1, a kind of few tooth difference chain type planetary reducer, it comprises double bush roller chain, planet sprocket, the center sprocket wheel, bent axle, output sprocket, feature of the present utility model is: planet sprocket [6], [8] be enclosed within respectively on two eccentric cylinders of bent axle [3], planet sprocket [6], [8] side respectively with the eccentric cylinder that is enclosed within bent axle [3] on shock absorber [7], [15] connect, eccentric balancing blocks [2] is connected with bent axle [3] and places shock absorber [7], [15] in, double bush roller chain [5] is connected with center fixation sprocket wheel [4] with planet sprocket [6] respectively, and double bush roller chain [9] is connected with the output center sprocket wheel [10] of center fixation at output shaft [12] with planet sprocket [8] respectively.

2, few tooth difference chain type planetary reducer according to claim 1 is characterized in that described planet sprocket and center sprocket wheel adopt standard involute gear hobboing cutter, the negative big displacement model of gear shaper cutter to become the prolate involute profile of tooth of cutting or two circular arcs, the one straight line profile of tooth of employing standard sprocket hobboing cutter cutting.

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