CN87106948A - Floating autocompact friction gearing - Google Patents
Floating autocompact friction gearing Download PDFInfo
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- CN87106948A CN87106948A CN87106948.2A CN87106948A CN87106948A CN 87106948 A CN87106948 A CN 87106948A CN 87106948 A CN87106948 A CN 87106948A CN 87106948 A CN87106948 A CN 87106948A
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- wheel
- floating
- friction
- normal direction
- gear
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Abstract
The present invention is the floating autocompact friction gearing that is applied to mechanical transmission fields, floating bracket [5] and Returnning spring [5d] have mainly been adopted, this device is had float to follow the tracks of that instantaneous Continuous Contact compresses automatically and regulate the function that normal direction impacting force size drives workpiece automatically by load, comprehensive technical performance is good.It has saved traditional friction driving hold down gag and has regulated the additional mechanism providing additional operation of normal direction impacting force size; With the inside engaged gear velocity ratio, avoided making the difficulty of large scale internal gear, good manufacturability, low cost of manufacture, overall economic efficiency height.
Description
The present invention is a kind of new drive device-floating autocompact friction gearing that is applied in the mechanical transmission.Below with reference to accompanying drawing prior art of the present invention and particular content of the present invention are done an elaboration.
Fig. 1 is the mode that compresses in the existing friction driving.
Fig. 2 is an actuator system schematic representation of the present invention.
Fig. 3 is transmission principle figure of the present invention.
Fig. 4 is a main pseudosection of the present invention.
Fig. 5 is a side view of the present invention.
According to " mechanical engineering manual " the 33rd piece " band, chain friction and power screw " of the chief editor of Shenyang Mechano-Electrical College and " machine parts " the 2nd volume " gear " described mechanical transmission of being write by West Germany Gustaf Nie Man (Gustav Niemann), the mode that compresses in the friction driving all can be reduced to situation shown in Figure 1.Among the figure, be friction driving between wheel (1 ') and wheel (2 '), and rotate with speed n1 and n2 respectively.This compresses mode and relies on the plus load Q on the wheel (1 ') to produce normal direction impacting force N1(N2), or the deadweight of roller (1 ') produces the normal direction impacting force.This deficiency that compresses mode is that its impacting force can not automatically regulate with the variation of external load, must often regulate artificially.And in vertical driving mechanism, wheel (1 ') deadweight has lost the effect that produces impacting force.For avoiding above-mentioned shortcoming, the present invention adopts floating bracket, realize to float follows the tracks of, and instantaneous Continuous Contact compresses automatically and regulates the function of normal direction impacting force size automatically by load, has obtained good effect.
In Fig. 2, motor (8) (or inserting other speed changers) drives garden bevel gear (7) and garden bevel gear (6) carries out engagement driving, and this is first order transmission; Be installed in garden bevel gear (6) coaxial garden stud wheel (4) and carry out engagement driving, constitute second level transmission with cylindrical gears (3); Be installed in the coaxial friction wheel of cylindrical gears (3) (2) and carry out friction driving with wheel (1) (driven rotation work spare), constitute third level transmission, wheel (1) is gone up at supporting roller (9) and is rotated.
As shown in Figure 3, O
1Be the axle center of wheel (1), wheel (1) is around O
1With speed n
1Rotate r
1Be wheel (1) radius.O
3And O
4Be respectively the axle center of gear (3) and gear (4), gear (3) and gear (4) are respectively around O
3Axle and O
4Axle is with speed n
3And n
4Rotate, and be installed in jointly can be around O
4In the floating bracket (5) of axle swing.Gear (3) is coaxial with wheel (2), i.e. n
3=n
2, this can make wheel (2) with floating bracket (5) around O
4The axle swing.Tangential working resistance (load) when wheel (1) rotates is F
1, wheel (2) is F to the tangential driving force of wheel (1)
2, F
1=F
2=F.Friction factor between wheel (1) and wheel (2) is f, and the normal direction impacting force is N, and then wheel (1) is N 〉=(K with the necessary normal direction impacting force of wheel (2) proper functioning
sThe F=KF of)/(f), K
sBe loading coefficient, generally get 1.25～1.5, K
1=(K
s)/(f) is the necessary reinforcement multiple of friction wheel proper functioning.The automatic impacting force of the normal direction that transmission device can provide is N=((A)/(Sin θ)+ctg θ) F=K
2F, A are impeller diameter ratio, A=(γ
2)/(γ
3), r
2And r
3Be respectively the joint garden radius of wheel (2) radius and gear (3); θ is the angle parameter, θ=∠ O
1O
3O
4; K
2Be the reinforcement multiple that transmission device provided, K2=(A)/(Sin θ)+ctg θ.The automatic impacting force N of the normal direction that transmission device can provide also can be expressed as N=K
2K
3F
n, K
3Be the coefficient of determining by the transmission device geometrical factor, K
3=(γ
3)/(γ
2) cos α cos β, α is the working pressure angle of wheel (3) with wheel (4), the helix angle when β is a gear (3) for helical gear, F
nBe the normal direction engaging force between gear (3) and gear (4).The transmission condition that guarantees the transmission device proper functioning is (A)/(Sin θ)+ctg θ 〉=(K
S)/(f), i.e. K
2〉=K
1As from the foregoing as long as K
2And K
3Non-vanishing, normal direction engaging force F
nTotal energy forms the automatic impacting force N=K of normal direction
2K
3F
n, wheel (1) and wheel (2) are compressed automatically.By top formula N=K
2F works as COEFFICIENT K as can be known
2One regularly, and the size of the automatic impacting force N of normal direction that friction gearing provides is to regulate automatically by the size of load (i.e. the tangential working resistance of wheel (1)) F.When external load was zero, the automatic impacting force of normal direction also was zero.When transmission device was not worked, the automatic impacting force of normal direction disappeared immediately.This is to life-span of prolonging bearing and avoid the rubber friction wheel distortion very favourable.
During the friction gearing starting, wheel (2) does not contact with wheel (1), and whole floating bracket (5) is subjected to O
4The friction torque effect of axle is swung along clockwise direction, and wheel (2) is pushed to wheel (1) (also promptly wheel (2) is swung with floating bracket (5)) in the contact of P point, and transmission can normally be carried out.Wheel (2) may not contact with wheel (1) to not making floating bracket (5) swing in case friction torque is little, and then transmission device can not rotate by driven wheel (1).In order to solve this starting problem of unstable, only need a Returnning spring (5d) (see figure 5) is installed, floating bracket (5) is pulled to wheel (1), wheel (2) is contacted with wheel (1) all the time, thereby obtain an initial normal direction impacting force, transmission device obtains normal starting.
In Fig. 3, Fig. 4, (10) be and the joining input shaft of motor (or with other retarders), by garden taper roller bearing (28) supporting, drives bevel gear (6) and rotate by being installed in bevel gear (7) on the axle (10).(11) be the bearing gland of band sealing, (12) are a set of cups, and (13) are casing, and (26) press (vexed) lid for bearing, and (25) are inspection hole cover.Bevel gear (6) is installed in the bottom of axle (24), and axle (24) is by garden taper roller bearing (23) supporting, and (27) are bearing race, and (29) are the bearing gland of band sealing.(5a) is supporting disk, and (5b) is the pivoted arm tube, and (5c) is the arm lid, and (5d) is Returnning spring, and having formed by above-mentioned four (to be O around axle (24)
4Axle) floating bracket (5) of swing.For making wheel (2) and wheel (1) keep float tracking, instantaneous Continuous Contact, between supporting disk (5a) and pivoted arm tube (5b), connect with Returnning spring (5d).(21) and (22) be sliding bearing.Gear (4) is installed in the top of axle (24), and gear (4) (is O with being installed in axle (20)
3Axle) gear (3) engagement on.Axle (20) is made radial support by sliding bearing (15) and (17) respectively, makes gap compensation radial support by single-row radial ball bearing (14), and (16) are thrust ball bearing, and wheel (2) is installed in the upper end of axle (20), is locked by locking nut (18).Wheel (2) outer cause ebonite is made.At the top of axle (24) and (20) dress forced filling oil cup (19), use for each bearing in the floating bracket and gear pressure injection butter.
The present invention can adopt vertical and horizontal two kinds of installation forms.As shown in Figure 4, be vertical installation form, when transmission device is not worked, only be subjected to the contact force of a very little action of reset spring between wheel (1) and wheel (2); Adopt horizontal installation form, when interior contact friction transmission, roller (2) deadweight can be played the effect of Returnning spring, and it is still followed transmission principle shown in Figure 2 and carries out transmission calculation, structure and Intensity Design.
The present invention also can adopt the outer contacting mounting type, be about to the outside and inside and outside contact installation combination thereof that this device is installed in wheel (1), be about to one in this device and be installed in wheel (1) inboard, another is installed in the outside of wheel (1) accordingly, or driving wheel (1) is made up in the uniform installation of inside and outside contact multimachine structure respectively.
The present invention is particularly useful for driving large-sized object, for example rotates the astronomical observation cover, revolving restaurant, revolving stage etc.The hemispherical cover body that science palace, Lanzhou observatory viewing hood is made with glass fibre reinforced plastics, diameter reaches 5.5 meters, and rotating speed is 0.6 rev/min, is installed in 41 meters high turriform building top.For driving this cover body, adopt floating autocompact friction gearing, since adopted a floating bracket and Returnning spring that this device is had to float follow the tracks of, instantaneous Continuous Contact compresses automatically and regulate the function of normal direction impacting force size automatically by load, saved traditional hold down gag and regulated the additional mechanism providing additional operation of normal direction impacting force size.The transmission structures compactness is beneficial to cat head and installs like this.It is much easier than the wire rope transmission, and has kept the perfection of cover body outward appearance; With the inside engaged gear velocity ratio, avoided making the difficulty of large scale internal gear, good manufacturability is promptly guaranteeing that transmission requires can reduce the processing and fabricating requirement that is driven part under the prerequisite of function, thereby low cost of manufacture.Good and the economic benefit height of this invention comprehensive technical performance in a word.
Claims (3)
1, a kind of floating autocompact friction gearing, it constitutes first order transmission, cylindrical gears [3] and the second level transmission of [4] formation by cone gear [6] and [7], friction wheel [2] and [1] constitute third level transmission, the invention is characterized in that it also is equipped with floating bracket [5], and gear [3] and [4] are installed in can be in the floating bracket [5] of axle [24] swing, and gear [3] is installed on the same axle [20] with wheel [2];
2, floating autocompact friction gearing according to claim 1 is characterized in that floating bracket (5) by supporting disk (5a), and pivoted arm tube (5b) and arm lid (5c) and Returnning spring (5d) are formed;
3,, it is characterized in that connecting with Returnning spring (5d) between supporting disk (5a) and the pivoted arm tube (5b) according to claim 1,2 described floating autocompact friction gearings;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87106948.2A CN1004723B (en) | 1987-10-20 | 1987-10-20 | Floating autocompact friction gearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87106948.2A CN1004723B (en) | 1987-10-20 | 1987-10-20 | Floating autocompact friction gearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87106948A true CN87106948A (en) | 1988-04-13 |
| CN1004723B CN1004723B (en) | 1989-07-05 |
Family
ID=4815911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN87106948.2A Expired CN1004723B (en) | 1987-10-20 | 1987-10-20 | Floating autocompact friction gearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1004723B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1070592C (en) * | 1998-02-20 | 2001-09-05 | 李蕴藻 | Load gear driving conical surface friction speed variator |
| CN106940253A (en) * | 2017-03-01 | 2017-07-11 | 浙江兆丰机电股份有限公司 | Automobile hub bearing friction torque detection means |
-
1987
- 1987-10-20 CN CN87106948.2A patent/CN1004723B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1070592C (en) * | 1998-02-20 | 2001-09-05 | 李蕴藻 | Load gear driving conical surface friction speed variator |
| CN106940253A (en) * | 2017-03-01 | 2017-07-11 | 浙江兆丰机电股份有限公司 | Automobile hub bearing friction torque detection means |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1004723B (en) | 1989-07-05 |
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| CF01 | Termination of patent right due to non-payment of annual fee |