CN2519868Y

CN2519868Y - Composite gear

Info

Publication number: CN2519868Y
Application number: CN01265142U
Authority: CN
Inventors: 郑松柏
Original assignee: Avision Inc
Current assignee: Avision Inc
Priority date: 2001-10-31
Filing date: 2001-10-31
Publication date: 2002-11-06
Anticipated expiration: 2011-10-31

Abstract

A compound gear is disclosed which is formed by splicing a first gear with a second gear and installing a torsion component on the surface of the first or the second gears. The sizes and the gear numbers of the first and the second gears are totally the same. And after the overlapping gears of the first and the second gears are back-to-back staggered, the torsion component provides a recovery torsion to form no back clearance between the gears of the first and the second gears, which are combined, neighboring and meshed.

Description

Compound gear

Technical field

The utility model relates to a kind ofly can eliminate the back clearance that the gear train timing is produced, to be used for the compound gear of precision drive.

Background technique

The transmission of gear is meant that at least two gears rotate with the tooth interlock of periphery mutually.Because each tooth-formation of gear size and tooth pitch difference are so can form backlash between engaged gear.In the transmission process, comprise between the engaged gear and rolling and the two kinds of motor patterns that slide that do not produce under the situation of interference in consideration, engaged tooth and between cog also have certain clearance again.

There is the gap between the engaged gear, though help the transmission of two gears, but also have influence on gear-driven precision significantly, cause the precision of transmission to descend, especially being used in scanner, printer etc. needs on the device of precision drive, the use precision of this device will be limited, and the demand of precision drive can't be further satisfied.

The model utility content

The purpose of this utility model is to provide a kind of compound gear, the back clearance problem that it is produced in the time of can solving the gear interlock effectively.

The purpose of this utility model is achieved in that promptly provides a kind of compound gear, includes: one first gear; One second gear that splices with described first gear, its size and the number of teeth are identical with described first gear; And a torque component, be located on the wherein gear of first gear and second gear, and respectively with described first gear and the described second gear winding, answer torsion is provided when staggering in order to the tooth that overlaps each other at described first gear and second gear.

Advantage of the present utility model is, the overlapping tooth of its first gear and second gear is after opposing staggering, can be by the restoring force of this torque component to produce relative movement trend, form the interlocking pattern of no back clearance in order to the adjacent gear of interlock, and make the transmission process of gear not have interference situations, simultaneously, the interlock of tooth and tooth is tight, therefore can reach the effect of precision drive.

Description of drawings

Fig. 1 is an exploded view of the present utility model;

Fig. 2 is an assembled sectional view of the present utility model;

Fig. 3 is a combination appearance figure of the present utility model;

Fig. 4 is the combination appearance figure of another structure of the utility model;

Fig. 5 is the partial enlarged drawing of another structure of the utility model;

The phase diagram that Fig. 6 staggers for the utility model tooth;

Fig. 7 is the utility model and another gear interlocking pattern figure.

Embodiment

Fig. 1～Fig. 3 is the compound gear according to preferred embodiment.This compound gear comprises one first gear 11, one second gear 21 and a torque component 31.Wherein this torque component 31 is meant a torsion spring or other equivalence element.

This first gear 11 is provided with a plurality of teeth 12 in outer periphery system.Be provided with a jack-post 14 again in the central position on a surface 13, this jack-post 14 be axially arranged with an axis hole that runs through 15.This external position that should surface 13 adjacent teeth 12 is provided with a projection 16.This projection 16 axially offer an assembly hole 17.

This second gear 21 is provided with a plurality of teeth 22 in outer periphery system.Be provided with a jack-post 24 again in the central position on a surface 23, this jack-post 24 axially offer an axis hole that runs through 15, and in this axis hole 15, be provided with a retaining edge 26.Should offer a perforation 27 that runs through and be microscler shape in surface 23 in addition, and a jack that does not run through 28, and between perforation 27 and jack 28, be provided with a fastening part 29.

It should be noted that the big or small identical of this first gear 11 and this second gear 21, and the quantity of

tooth

12,22 is also identical.

During assembling, the jack-post 14 of this first gear 11 is located in the axis hole 25 of this second gear 21, and the top of this jack-post 14 is resisted against on the retaining edge 26, and this axis hole 15 and this axis hole 25 are interconnected.The projection 16 of this first gear 11 is located in the perforation 27 of this second gear 21 again, and each tooth 12 of first gear 11 is overlapped with each tooth 22 of second gear 21.

Then first end 32 with this torque component 31 is set on the assembly hole 17 of this projection 16, and second end 33 of torque component 31 is set on the jack 28.And the segment section 34 between first end 32 and second end 33 rests on this fastening part 29.

Fig. 4, Figure 5 shows that another example structure.This first gear 11 has the identical size and the number of teeth with this second gear 21.This first gear 11 splices with this second gear 21 again, and the projection 16 of this first gear 11 is located in the perforation 27 of this second gear 21.

Surface that it should be noted that this second gear 21 is provided with a projection 43.This projection 43 is made plane of inclination 44 near a side of perforation 27.This plane of inclination 44 is lower near an end of perforation 27, and higher away from an end of perforation 27.

First end 32 of this torque component 31 is plugged on the projection 16; Second end 33 of torque component 31 is made and is colluded shape and be located on the projection 43 for colluding.

Because a side of this projection 43 is shaped on plane of inclination 44, thus second end 33 of this torque component 31 can be along the plane of inclination 44 to a higher end slippage, wait cross a higher end after, can fall automatically with projection 43 and form the state that combines of establishing that colludes.

On the other hand, if second gear 21 of Fig. 4 is provided with fastening part 29 as second gear 21 of Fig. 1, then second end 33 of torque component 31 also can be made into and colludes shape.In the case, the assembler leans against projection 16 and fastening part 29 with torque component 31, and second end 33 of torque component 31 is pushed away on the plane of inclination 44 of projection 43, drops at last under the projection 43.So also can reach the required effect of the utility model.

See also shown in Figure 6ly, when first gear 11 and second gear 21 relatively rotated, the

tooth

12,22 that originally overlaps just can stagger with opposing direction.Because

first end

32 and 11 windings of first gear of this torque component 31, this second end (not shown) and 21 windings of second gear are so when first gear 11 and second gear 21 stagger, can cause this torque component 31 to be compressed or to uphold.No matter be that a kind of stressed situation, this torque component 31 all provides elastic-restoring force, is enough to impel the

tooth

12,22 that staggers that the trend of relative movement (reverting back to overlapping shape) is arranged.

See also shown in Figure 7, during use, compound gear and a gear 41 interlocks that this first gear 11 and second gear 21 splice, and the total thickness after this first gear 11 and second gear 21 splice is suitable with the thickness of gear 41, so, the tooth 42 of gear 41 peripheries can with

tooth

12,22 interlocks of the shape that becomes to stagger.Side that it should be noted that this tooth 22 and tooth 42 against, and the opposite side of elastic-restoring force that tooth 22 is provided by the torque component (not shown) and tooth 12 against.

So, compound gear provided by the utility model and gear 41 interlocks do not have the back clearance problem.And because this tooth 12 has elasticity after cooperating these torque components 31, so in transmission process, this tooth 12 can be along with stressed and adjust the position automatically, and be held against shape with this tooth 42.In other words, the interlock of

tooth

12,22 and tooth 42 not only closely but also do not have interference situations, from the effect that can reach precision drive.

Claims

1. a compound gear is characterized in that, includes: one first gear; One second gear that splices with described first gear, its size and the number of teeth are identical with described first gear; And a torque component, be located on the wherein gear of first gear and second gear, and respectively with described first gear and the described second gear winding, answer torsion is provided when staggering in order to the tooth that overlaps each other at described first gear and second gear.

2. compound gear as claimed in claim 1 is characterized in that, described torque component is a torsion spring, and an end group of described torsion spring is located on first gear, and the other end group is located on second gear.

3. compound gear as claimed in claim 1 is characterized in that, described first gear and described second gear are provided with corresponding perforation and the projection of assembling, and are beneficial to relatively rotating of first gear and second gear.

4. compound gear as claimed in claim 3 is characterized in that described perforation is located on second gear, and projection is located on first gear.

5. compound gear as claimed in claim 3 is characterized in that, described perforation is an elongated hole.

6. compound gear as claimed in claim 1 is characterized in that, is provided with a fastening part for the described torque component of blocking on the gear of using for described torque component setting.

7. compound gear as claimed in claim 2 is characterized in that, offers an assembly hole on described first gear, and offers a jack on second gear, and the two ends of described torque component combine with described assembly hole and described jack insert group respectively.

8. compound gear as claimed in claim 2 is characterized in that, offers an assembly hole on described first gear, and second gear is provided with a projection, and an end of described torque component combines with described assembly hole insert group, and the other end combines with described projection trip.

9. compound gear as claimed in claim 8 is characterized in that, a side of described projection is provided with the plane of inclination.