CN2086825U

CN2086825U - Speed reducer with displaced rollers

Info

Publication number: CN2086825U
Application number: CN 90227005
Authority: CN
Inventors: 严明
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-12-28
Filing date: 1990-12-28
Publication date: 1991-10-16

Abstract

The utility model relates to a speed reducer with displaced rollers, which is mainly composed of an inner gear ring, a rolling column tray and an input shaft with an eccentric bearing. The tooth profile of the inner gear ring is composed of circular arcs and tangent lines, and is basically fit with a theoretical curve. Dedendums and addendums are all in void contact with rolling columns, without the defect of an oversize pressure angle. The rolling column tray is provided with uniformly distributed radial slots; 1-3 rolling columns are arranged in each slot. The rolling columns are in rolling meshing engagement with an inner gear, under the push of the eccentric bearing; the speed is reduced by one tooth difference. The utility model has the advantages of small volume, easy fabrication, high efficiency, low noise and long service life. Single stage transmission ratio can reach about 90; supergiant type or supersmall type machines can all be manufactured.

Description

Speed reducer with displaced rollers

The utility model relates to the displaceable retarder of a kind of mechanical transmission of transferring rotational motion, particularly roller and gear engagement and roller, is the modifying device of my former utility model patent " displacement Roller speed reducer ".

In the present known planetary speed reducer with small tooth number difference field, the involute planetary gear retarder easily produces Tooth Shape Interference; The cycloid wheel of cycloidal-pin wheel retarder is complex-shaped, the processing cost height, and its pin gear, cantilever type bearing pin and capacity eccentric bearing are all fragile, and output mechanism is loaded down with trivial details, and causes axial dimension bigger; Flexbile gear is called on the ripple retarder and is cost an arm and a leg, and heavy duty is fragile down; The tip oscillating tooth of oscillating tooth pinwheel reducer is made difficulty, and noise is big, quick abrasion, and transmission efficiency is low, more than various retarders because on making, power all is restricted.

I have obtained the displacement Roller speed reducer of patent (87 2 07321.1), utilizing on the input shaft capacity eccentric bearing and push rod to promote the uniform roller of roller dish periphery meshes and transmission with the gear displacement, the related internal gear of this patent has two kinds, one is the pinwheel that circumferentially uniform cylindrical needle tooth is formed, and it two is the straight-tooth ring gear of straight line profile of tooth.Have push rod in the roller dish shown in this patent working example, the displacement Roller speed reducer of Gou Chenging is having certain narrow limitation aspect the reduction speed ratio power range thus.

The purpose of this utility model is to overcome the deficiency and the narrow limitation of above-mentioned retarder, and a kind of novel displacement Roller speed reducer is provided, and it not only has bigger velocity ratio and power range, and further reduces manufacture cost and improve transmission efficiency.

The displacement Roller speed reducer that the purpose of this utility model has mainly obtained patent by following measures to me is improved to be finished.

Retarder mainly is made of the internal gear of periphery, the roller dish at middle part and the input shaft of band capacity eccentric bearing, and internal gear is the straight-tooth ring gear, and profile of tooth is made of circular arc and tangent line, and roller dish end face has radial groove, and every groove is provided with 1-3 roller.

When input shaft rotates, the capacity eccentric bearing outer shroud produces radial thrust to roller, and outer roller promptly rolls along the flank of tooth of internal gear, and roller and capacity eccentric bearing outer shroud all roll thereupon in this moment, because, promoting roller dish and internal tooth crop rotation at the continuous rolling of each flank of tooth, roller colony relatively rotates.Meanwhile, another place's roller of symmetry inwardly rolls along the internal gear another side with it, and involution so goes round and begins again to initial position, and retarder does to wait continuously the speed ratio transmission.Because internal gear and roller are taken inventory " tooth is poor ", when fixed annulus, can be by the output of roller dish, speed ratio i=n-1[n is the ring gear number of teeth], turn to opposite with input shaft; When fixing roller dish, can export by internal gear, speed ratio i=n, turn to import identical.

Below with reference to accompanying drawing the utility model embodiment is described in detail:

Fig. 1 is the erection drawing of a kind of embodiment of the utility model (horizontal-type biaxial type) concrete structure.

Fig. 2 is a kind of embodiment's of the utility model theory of engagement figure.

Fig. 3 is the plan view and the sectional view of the roller dish disk body of a kind of concrete structure of the utility model.

Fig. 4 is a kind of roller schematic representation with roll sleeve of the utility model.

Fig. 5 is the erection drawing of another kind of embodiment of the present utility model (the axle sleeve type retarder that is used for the belt conveyer transmission).

With reference to Fig. 1, Fig. 2, retarder is mainly by internal gear 1, and the input shaft 4 of roller dish 2 and band capacity eccentric bearing constitutes, and is provided with displacement roller 3 in the part 2, and affixed with part 5, and when internal gear 1 fixedly the time, 5 of parts are output shaft.

With reference to Fig. 2, outside inner gear is the ring gear that circular arc and tangent line thereof constitute profile of tooth, and the profile of tooth half-angle is generally 35 °～55 °, and roller is done radial motion under the capacity eccentric bearing of specific eccentric distance e promotes, and with roller dish even angle rate (ω _λ/ i) rotatablely move syntheticly, can get roller central motion track, when the roller diameter was suitable numerical value, its envelope promptly formed approximate " circular arc adds tangent line " profile of tooth.Owing to replace theoretical envelope with " circular arc adds tangent line ", both simplified processing, guarantee the accuracy of mesh again at effective section, and make pressure angle in the Gear Root circular arc section all be non-stand under load operating mode rolling with roller greater than 60 ° part and tooth top part, thereby can reduce the suffered radial load of capacity eccentric bearing and roller, prevent spot corrosion, improve working life, can keep again than low noise.

With reference to Fig. 1, Fig. 2, Fig. 3, the roller dish generally can have two layers to wait the branch radial groove, two layers of mutually wrong 180 °/n-1(n are the interior number of teeth), roller is set in the groove, the disk body biend all has disk cover with roller constraint wherein, places two rollers in general every groove, but can be one during little speed ratio, can be three during large speed ratio, roller axis and internal gear teeth are to parallel.Hold under the outer shroud promotion at wrong mutually 180 ° of double-eccentric shafts on the input shaft, roller can not only roll but also do radial displacement in groove, rolls with internal gear and meshes.

Above-mentioned roller dish can be slotted respectively on the positive and negative two sides of disk body and be made; Also can combine, and can directly on the disk of output shaft, slot and make one of them monomer dish by the monomer dish of two flutings.

When transmitting low-speed motion or smaller power or having low cost in mind especially, can use the monomer dish of only opening one deck groove, only adorn a single eccentric bearing on the input shaft.

With reference to Fig. 2, above-mentioned roller dish and internal gear are " tooth is poor " relation, and promptly the internal gear number of teeth is Duoed one than roller dish single face radial groove number (not jumping under the dentation condition).

The displacement roller is the cylindrical body of chamfering, is generally metal and makes, and makes as adopting Bearing Steel quenching grinding, adopts engineering plastics etc. nonmetal (as polyoxymethylene, teflon) to make during specific (special) requirements or both are in conjunction with making.This roller can be solid or hollow body.

With reference to Fig. 4, roller can be combined by mandrel and two kinds of roll sleeves of M, N, and roll sleeve all can freely rotate on mandrel, and M roll sleeve external diameter is slightly less than the N roll sleeve, can reduce the sliding friction loss, further improves transmission efficiency.

When being used for big speed ratio, be minimizing amount of finish and roller quantity, and increase the roller diameter that reduce contact stress, branch radial grooves such as roller dish can uniformly-spaced be jumped tooth, promptly are reduced to 1/2 or 1/3, and keep circumferentially uniform.With reference to Fig. 3, shown in 22 of every on roller dish flutings, can be used for speed ratio and be 44 retarder.

Utilize the transmission principle of the utility model, can be made into different support retarders such as horizontal, vertical, side-mounted, also can be made into different types of machines such as biaxial type and motor direct-connection type.

The utlity model has following advantage:

1, volume is little, and speed ratio is big;

2, multiple tooth engagement, smooth running;

3, output mechanism has been cancelled the dynamic fit between original planetary speed reducer with small tooth number difference cantilever bearing pin, guide, the pin-and-hole, Reliability Enhancement;

4, the comparable planet-cycloid reducer of capacity eccentric bearing strengthens, and improves service life;

5, in the engagement process, the rolling composition increases, and the slip composition reduces, and especially stressed biggest place is rolling condition, so the transmission efficiency height, part life is long;

6, manufacture cost reduces about 20% than cycloidal-pin wheel retarder.

Annotate: the straightway of profile of tooth half-angle---ring gear profile of tooth and the folded acute angle of center line that passes through tooth top.

I---gearratio

ω _λ---power shaft angular speed.

Claims

1, a kind of improved displacement Roller speed reducer mainly is made of the internal gear of periphery, the roller dish at middle part and the input shaft of band capacity eccentric bearing, it is characterized in that:

(1) described internal gear is the straight-tooth ring gear, and profile of tooth is made of circular arc and tangent line thereof, and the profile of tooth half-angle is generally 35 degree-55 degree, and the tooth root part all is non-stand under load operating mode with roller with the tooth top part and contacts;

(2) described roller dish has branch radial grooves such as one deck or two layers, and mutually wrong 180 °/n-1 (n is the interior number of teeth) is provided with roller in the time of two layers in the groove;

(3) the described internal gear number of teeth is Duoed one than roller dish single face radial groove number (not jumping under the dentation condition).

2, by the described retarder of claim 1, it is characterized in that: fixedly during ring gear, exported by the roller dish, speed ratio i=n-1(n is the interior number of teeth), switched in opposite; Fixedly during the roller dish, by ring gear output, i=n turns to identical.

3, by the described retarder of claim 1, it is characterized in that being provided with in the every groove of roller dish 1-3 roller, be 1 during little speed ratio, be 3 during large speed ratio, roller can rotate and radial displacement in groove.

4, by the described retarder of claim 1, it is characterized in that roller is metal or engineering plastics cylindrical body.

5, by the described retarder of claim 1, it is characterized in that roller can be made of mandrel and roll sleeve.

6, by the described retarder of claim 1, it is characterized in that: when being used for the large speed ratio transmission, branch radial grooves such as roller dish can be reduced to 1/2 or 1/3, and keep circumferentially uniform.