CN103089920B - A kind of pure rolling gear mechanism - Google Patents
A kind of pure rolling gear mechanism Download PDFInfo
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- CN103089920B CN103089920B CN201310054550.7A CN201310054550A CN103089920B CN 103089920 B CN103089920 B CN 103089920B CN 201310054550 A CN201310054550 A CN 201310054550A CN 103089920 B CN103089920 B CN 103089920B
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- 230000007246 mechanism Effects 0.000 title claims abstract description 31
- 238000005096 rolling process Methods 0.000 title claims abstract description 22
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 7
- 210000000515 tooth Anatomy 0.000 claims description 74
- 230000001050 lubricating effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 210000001138 tear Anatomy 0.000 description 1
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Abstract
The invention discloses a kind of pure rolling gear mechanism.Frame is provided with two axis being parallel or crossing friction wheel, the tangent contact of two-wheeled, frictional force is relied on to do pure rolling, it is evenly equipped with respectively and protrudes and recessed pairing profile of tooth, make with in arbitrary Plane of action or sphere of two friction wheel axes normal, the only tangent contact on the public point of contact of two pitch circles of pairing profile of tooth, instantaneous engagement, the driving mechanism that formation friction driving and engagement driving coexist.If at any instantaneous all at least existence two Instant meshing points, they lay respectively in different Plane of action or sphere, form tight mesh, just only can retain engagement driving, and no longer need friction driving, but be still pure rolling between two-wheeled, there is no relative sliding.The present invention combines the major advantage of friction driving and engagement driving: its both fricton-tight friction, without the need to lubricating, have again accurate speed ratio.Little in load, need the accurate speed ratio occasion that inconvenience is carried out lubricating again to have broad application prospects.
Description
Technical field
The present invention relates to gear mechanism, especially relating to a kind of pure rolling gear mechanism not having relative sliding when engaging.
Background technique
In mechanical transmission, friction wheel mechanism and gear mechanism are two kinds of complementary mechanisms, and their transmission principle is completely different.Have two friction wheels in friction wheel mechanism, they have closed smooth contoured; During work, the tangent contact of two friction wheels relies on frictional force to do pure rolling, usually need not lubricate; But friction wheel mechanism is difficult to ensure speed ratio accurately.There are two gears in gear mechanism, each gear are evenly equipped with respectively and protrude and recessed pairing profile of tooth; During work, the engagement driving of two-wheeled roller tooth, can ensure speed ratio accurately; But overmask has relative sliding, there is sliding friction, usually need lubrication.
Summary of the invention
The object of the present invention is to provide a kind of pure rolling gear mechanism, can comprehensively friction driving and gear-driven major advantage, and avoid its respective major defect.
The technical solution adopted for the present invention to solve the technical problems is:
Technological scheme 1:
A kind of pure rolling gear mechanism: the friction wheel being provided with two axis being parallel in frame, the tangent contact of two friction wheels relies on frictional force to do pure rolling, the cylndrical surface of two friction wheels is evenly equipped with respectively and protrudes and recessed pairing profile of tooth, make with in arbitrary Plane of action of two friction wheel axes normal, the profile of tooth only tangent contact on the public point of contact of two pitch circles of pairing, instantaneous engagement; Two friction wheels do not have relative sliding when engaging, the driving mechanism that formation friction driving and engagement driving coexist.
In two described friction wheels, the cylndrical surface of first friction wheel is evenly equipped with protrusion hemi-spherical ended shape insert outside; The cylndrical surface of second friction wheel is evenly equipped with cone shape hole that is equal with the hemi-spherical ended shape insert tooth pitch on first friction wheel, instantaneous engagement; The bus of cone shape hole is involute, circular arc or straight line; Contact points both in the great circle of hemi-spherical ended shape insert sphere, again on the seamed edge of taper hole.
In two described friction wheels, the cylndrical surface of first friction wheel is evenly equipped with protrusion helical tooth outside; The cylndrical surface of second friction wheel is evenly equipped with spiral chute that is equal with the helical tooth tooth pitch on first friction wheel, instantaneous engagement; In arbitrary Plane of action, the profile of tooth near contact points is involute, circular arc or straight line; Contact points both in the inside on helical tooth surface, again on the seamed edge of spiral groove surface.
In two described friction wheels, all spiral chutes on second friction wheel all stretch out along radius and form protrusion spiral salient outside, make contact points appear at the inside of spiral groove surface, instead of appear on the seamed edge of spiral groove surface; In order to not interfere with the spiral salient on second friction wheel, on the cylndrical surface of first friction wheel, the both sides of all helical tooths are all distributed with the auxiliary groove of spiral not participating in engaging.
Technological scheme 2:
A kind of pure rolling gear mechanism: the gear being provided with two axis being parallel in frame, the cylndrical surface of first gear is evenly equipped with the helical tooth of protrusion, the cylndrical surface of second gear is evenly equipped with recessed spiral chute that is equal with the helical tooth tooth pitch on first gear, instantaneous engagement; In the arbitrary Plane of action vertical with two Gear axis, the helical tooth of pairing contacts with only tangent on the public point of contact of two-wheeled pitch circle between spiral chute, instantaneous engagement, and two gears do not have relative sliding when engaging; Helical tooth and spiral fluted helix angle should ensure instantaneously all at least there are two contact pointss any, and two contact pointss lay respectively in different Plane of action, form tight mesh; In arbitrary Plane of action, the profile of tooth near contact points is involute, circular arc or straight line.
Technological scheme 3:
A kind of pure rolling gear mechanism: the friction wheel being provided with two axes intersect in frame, the tangent contact of two friction wheels relies on frictional force to do pure rolling, the conical surface of two friction wheels is evenly equipped with respectively and protrudes and recessed pairing profile of tooth, make engaging in sphere with the arbitrary of two friction wheel axes normal, the profile of tooth only tangent contact on the public point of contact of two pitch circles of pairing, instantaneous engagement; Two friction wheels do not have relative sliding when engaging, the driving mechanism that formation friction driving and engagement driving coexist.
In two described friction wheels, the conical surface of first friction wheel is evenly equipped with protrusion hemi-spherical ended shape insert outside; The conical surface of second friction wheel is evenly equipped with cone shape hole that is equal with the hemi-spherical ended shape insert tooth pitch on first friction wheel, instantaneous engagement; The bus of cone shape hole is involute, circular arc or straight line; Contact points both in the great circle of hemi-spherical ended shape insert sphere, again on the seamed edge of taper hole.
In two described friction wheels, the conical surface of first friction wheel is evenly equipped with protrusion helical tooth outside; The conical surface of second friction wheel is evenly equipped with spiral chute that is equal with the helical tooth tooth pitch on first friction wheel, instantaneous engagement; In arbitrary engagement sphere, the profile of tooth near contact points is the great circle in spherical involute, circular arc or engagement sphere; Contact points both in the inside on helical tooth surface, again on the seamed edge of spiral groove surface.
In two described friction wheels, all spiral chutes on second friction wheel all stretch out along radius and form protrusion spiral salient outside, make contact points appear at the inside of spiral groove surface, instead of appear on the seamed edge of spiral groove surface; In order to not interfere with the spiral salient on second friction wheel, on the conical surface of first friction wheel, the both sides of all helical tooths are all distributed with the auxiliary groove of spiral not participating in engaging.
Technological scheme 4:
A kind of pure rolling gear mechanism: the gear being provided with two axes intersect in frame, the conical surface of first gear is evenly equipped with the helical tooth of protrusion, the conical surface of second gear is evenly equipped with recessed spiral chute that is equal with the helical tooth tooth pitch on first gear, instantaneous engagement; Engaging in sphere with vertical arbitrary of two Gear axis, the helical tooth of pairing contacts with only tangent on the public point of contact of two-wheeled pitch circle between spiral chute, instantaneous engagement, and two gears do not have relative sliding when engaging; Helical tooth and spiral fluted helix angle should ensure instantaneously all at least there are two contact pointss any, and two contact pointss lay respectively in different engagement spheres, form tight mesh; In arbitrary engagement sphere, the profile of tooth near contact points is the great circle in spherical involute, circular arc or engagement sphere.
The beneficial effect that the present invention has is:
As heterozygosis or the variation of friction wheel mechanism and gear mechanism, it combines the major advantage of friction driving and engagement driving, and avoids respective major defect: its both fricton-tight friction, without the need to lubrication, have again accurate speed ratio.Certainly, compared with general friction driving, complexity is which increased; Compared with general gear transmission, that reduce bearing capacity.Thus little in load, need the accurate speed ratio occasion that inconvenience is carried out lubricating again to have broad application prospects.
Accompanying drawing explanation
Fig. 1 is fundamental diagram of the present invention.
Fig. 2 is the fundamental diagram of Fig. 1 near contact points.
Fig. 3 is the first concrete form figure of the present invention, is called that correction is engagement type.
Fig. 4 is the second concrete form figure of the present invention, is called that seamed edge is engagement type.
Fig. 5 is the improved form figure of Fig. 4.
Fig. 6 is the third concrete form figure of the present invention, is called normally engagement type.
Fig. 7 is the 4th kind of concrete form figure of the present invention, is called engagement type merely.
The engagement type figure of correction when Fig. 8 is axes intersect.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is fundamental diagram of the present invention.Be positioned at same Plane of action, the center of circle is respectively an O
1with an O
2two pitch circle P
1with P
2be tangential on node P.Cross node P make a skew lines and put O
1with an O
2line angle be γ, and with the center of circle at an O
1with an O
2two basic circle B
1with B
2be tangential on an A respectively
1with an A
2.Cross node P and can make basic circle B respectively
1with B
2involute Γ
1with Γ
2, they are A in the centre of curvature of node P respectively
1with an A
2.According to the known involute theory of engagement, as two pitch circle P
1with P
2when doing pure rolling, involute Γ
1with Γ
2keep the engagement of tangent contact, but all have relative sliding at other contact points place except node P.In order to avoid relative sliding, contact points is limited in node P place by the present invention, then keeps separated state in other position.For meeting this requirement, one of method is: by basic circle B
1with B
2one of or both shrink to node P simultaneously, obtain a pair new involute, then they are only in the tangent contact in node P place, instantaneous engagement, must be in separated state in other position.Such as by basic circle B
2to node P shrink obtain, the center of circle is positioned at an O
3the basic circle B of point
3involute Γ
3, it is an A in the centre of curvature of node P
3; Due to except node P, involute Γ
3drop on Γ completely
2inner side, so diagram instantaneous involute Γ
3with Γ
1tangent engagement, but be then in separated state in other position.Certainly, be not limited to involute for profile of tooth of the present invention, any pair of planar curve being only in separated state in the tangent contact in node P place in other position all can be selected.Therefore, two of method are: change one of involute or both into circular arc or straight line simultaneously.Such as, show circular arc Γ in figure
4with straight line Γ
5the situation of tangent contact, instantaneous engagement, they are in separated state in other position, can meet requirement of the present invention.
For the situation of axes intersect, be positioned at same engagement sphere, on sphere, the center of circle is respectively an O
1with an O
2two pitch circle P
1with P
2be tangential on node P.Cross node P make the great circle of an engagement sphere and cross a some O
1with O
2great circle angle be γ, and with the center of circle on sphere at an O
1with an O
2two basic circle B
1with B
2be tangential on an A respectively
1with an A
2.Cross node P and can make basic circle B respectively
1with B
2spherical involute Γ
1with Γ
2, they are A at the spheric curvature center of node P respectively
1with an A
2.According to the known spherical involute theory of engagement, as two pitch circle P
1with P
2when doing pure rolling, spherical involute Γ
1with Γ
2keep the engagement of tangent contact, but all have relative sliding at other contact points place except node P.In order to avoid relative sliding, contact points is limited in node P place by the present invention, then keeps separated state in other position.For meeting this requirement, one of method is: by basic circle B
1with B
2one of or both shrink to node P in engagement sphere simultaneously, obtain a pair new spherical involute, then they are only in the tangent contact in node P place, instantaneous engagement, must be in separated state in other position.Such as by basic circle B
2to node P engagement sphere in shrink obtain, on sphere, the center of circle is positioned at an O
3the basic circle B of point
3spherical involute Γ
3, it is an A at the spheric curvature center of node P
3; Due to except node P, spherical involute Γ
3drop on Γ completely
2inner side, so diagram instantaneous spherical involute Γ
3with Γ
1tangent engagement, but be then in separated state in other position.Certainly, be not limited to spherical involute for profile of tooth of the present invention, any a pair spherical curve being only in separated state in the tangent contact in node P place in other position all can be selected.Therefore, two of method are: one of spherical involute or both are changed simultaneously into the circular arc in engagement sphere or great circle.Such as, show the circular arc Γ in engagement sphere in figure
4with great circle Γ
5the situation of tangent contact, instantaneous engagement, they are in separated state in other position, can meet requirement of the present invention.
Meanwhile, although merely illustrate two-wheeled in figure to turn to contrary situation, the present invention is applicable equally to turning to identical situation.
Fig. 2 is the fundamental diagram of Fig. 1 near contact points.Because application claims a pair tooth curve is only in the tangent contact in node P place, instantaneous engagement, so be in fact only limitted to region very little near node P to the shape need of tooth curve, the shape of other position only otherwise interfere just, can unrestricted choice.Again because near smoothed curve any point, the shape of curve all can be approached by the circle of curvature, and therefore, research adopts arc toothed theoretical condition to be of universal significance in the present invention.As shown in the figure, be positioned at same Plane of action, the center of circle is respectively an O
1with an O
2two pitch circle P
1with P
2be tangential on node P, radius is respectively R
1=PO
1, R
2=PO
2; The arc toothed Γ of two-wheeled
1with Γ
2be tangential on node P, the center of circle is respectively an o
1with an o
2, radius is respectively r
1=Po
1, r
2=Po
2, from PO
2to Po
2corner be γ; Wherein R
2, r
2with γ always positive number, and R
1, r
1then can just can bear, be the situation of positive number shown in figure; R
1get negative number representation two-wheeled and turn to identical, some O
1with an O
2the homonymy at node P, and must to have | R
1| > R
2; r
1get the concavo-convex contact of negative number representation two-wheeled flank profil, some o
1with an o
2at the homonymy of node P.Now with node P for initial point, PO
2for x-axis sets up rectangular coordinate system, then at shown position circular arc Γ
1with Γ
2central coordinate of circle be respectively: o
1(-r
1cos γ ,-r
1sin γ) and o
2(r
2cos γ, r
2sin γ).Now, if wheel 1 is from shown position along turning over angle θ counterclockwise
1, then taking turns 2 along the angle turned over counterclockwise is θ
2=-R
1θ
1/ R
2, and circular arc Γ
1with Γ
2the coordinate in the center of circle become respectively: o
1[-R
1+ R
1cos θ
1-r
1cos (γ+θ
1), R
1sin θ
1-r
1sin (γ+θ
1)] and o
2[R
2-R
2cos θ
2+ r
2cos (γ+θ
2) ,-R
2sin θ
2+ r
2sin (γ+θ
2)].Now, circular arc Γ
1with Γ
2center of circle square distance λ (θ
1) become:
λ(θ
1)＝[R
2-R
2cosθ
2+r
2cos(γ+θ
2)+R
1-R
1cosθ
1+r
1cos(γ+θ
1)]
2(1)
+[-R
2sinθ
2+r
2sin(γ+θ
2)-R
1sinθ
1+r
1sin(γ+θ
1)]
2
By above formula to θ
1after differentiate, make θ
1=0:
λ(0)＝(r
2+r
1)
2
Analyze known, no matter R
1whether be just, (R
1/ R
2+ 1) R
1r
2always positive number, and work as r
1during for positive number, circular arc Γ
1with Γ
2the necessary and sufficient condition do not interfered near shown position is λ (θ
1) reach minimum at shown position, be equivalent to second dervative and be greater than zero at this point; Work as r
1during for negative, circular arc Γ
1with Γ
2the necessary and sufficient condition do not interfered near shown position is λ (θ
1) reach maximum at shown position, be equivalent to second dervative and be less than zero at this point.Therefore, circular arc Γ
1with Γ
2the necessary and sufficient condition that can use in the present invention is:
The theoretical condition of demand fulfillment when adopting arc toothed in the present invention that Here it is.The right of this inequality, the namely lower limit of synthetic curvature used in the present invention, in fact just involute profile Γ in Fig. 1
1with Γ
2synthetic curvature when the instantaneous engagement in node P place.Certainly, the actual synthetic curvature of the circular profile of tooth that can adopt should keep enough differences with this lower limit, to ensure having enough actual arc length to be used as actual profile of tooth near nodal.It can thus be appreciated that only with regard to the contact strength of flank engagement, bearing capacity of the present invention is by the involute tooth wheel mechanism lower than same size.
Equally, (3) formula and the bearing capacity that derives thus also can be extrapolated to the situation of axes intersect lower than the conclusion of the involute tooth wheel mechanism of same size, and just all variablees wherein are all defined on engagement sphere.
Specific embodiment 1:
Frame is provided with the friction wheel of two axis being parallel, the tangent contact of two friction wheels relies on frictional force to do pure rolling, the cylndrical surface of two friction wheels is evenly equipped with respectively and protrudes and recessed pairing profile of tooth, make with in arbitrary Plane of action of two friction wheel axes normal, the profile of tooth of pairing does not carry out continuing engagement, but only tangent contact on the public point of contact of two pitch circles, instantaneous engagement, be then in separated state in other position; Two friction wheels do not have relative sliding when engaging, the driving mechanism that formation friction driving and engagement driving coexist.
Fig. 3 is the first concrete form figure of the present invention, is called that correction is engagement type.At first friction wheel P
1cylndrical surface on be evenly equipped with protrusion hemi-spherical ended shape insert outside; At second friction wheel P
2cylndrical surface on be evenly equipped with cone shape hole that is equal with the hemi-spherical ended shape insert tooth pitch on first friction wheel, instantaneous engagement; Both are only at friction wheel P
2point D on upper conical bore seamed edge
2with friction wheel P
1respective point D on sphere tooth
1occur during tangent contact to engage instantaneously, be then in separated state in other position; The bus of cone shape hole have employed straight line in the drawings; Contact points D on hemi-spherical ended shape insert
1in the great circle of hemi-spherical ended shape insert sphere.It is actually arc toothed Γ from Fig. 1
4with straight line profile of tooth Γ
5develop and come.Correcting engagement type feature is manufacture simple, friction driving and engagement driving coexist, and engagement driving is only used as the angular errors leaning on friction driving to cause between elimination twice adjacent engagement.In order to reduce the angular errors that may occur, can misplace vertically and arranging many row's hemi-spherical ended shape inserts and taper hole.
Fig. 4 is the second concrete form figure of the present invention, is called that seamed edge is engagement type.For only leaning on the situation that may occur angular errors during friction driving in the first form between twice adjacent engagement, at first friction wheel P
1cylndrical surface on be evenly equipped with protrusion helical tooth outside; At second friction wheel P
2cylndrical surface on be evenly equipped with spiral chute that is equal with the helical tooth tooth pitch on first friction wheel, instantaneous engagement; When Face contact ratio is greater than 1, there is one or two contact points all the time, thus eliminate the possibility producing angular errors when only having friction driving in theory.Can to realize the principle of continuous transmission identical with being only greater than 1 by Face contact ratio in known circular tooth gear mechanism for this, but the contact points of circular tooth gear mechanism is not on node, there is sliding friction during engagement, and in the present invention on node, there is not sliding friction in contact points.In Plane of action, the profile of tooth in figure have employed circular arc and straight line.
Fig. 5 is the improved form figure of Fig. 4.Consider and in fact only have the profile of tooth near friction wheel cylndrical surface to participate in engagement, in the present embodiment, eliminate the first friction wheel P
1redundance in upper helical tooth, simultaneously by the second friction wheel P
2on spiral chute correspondingly change shallow.
Fig. 6 is the third concrete form figure of the present invention, is called normally engagement type.Notice in the second concrete form, the second friction wheel P
2the upper point participating in engaging, all on the seamed edge of spiral groove surface, easily weares and teares during engagement.For this reason, at the second friction wheel P
2on all spiral chutes all stretch out to be formed along radius and protrude spiral salient outside, make contact points appear at the inside of gullet surface, instead of appear on the seamed edge of gullet surface, become a kind of normal flank engagement state; In order to not with the second friction wheel P
2on spiral salient interfere, at the first friction wheel P
1cylndrical surface on the both sides of all helical tooths be all distributed with the auxiliary groove of spiral not participating in engaging.
Specific embodiment 2:
Frame is provided with the gear of two axis being parallel, the cylndrical surface of first gear is evenly equipped with the helical tooth of protrusion, the cylndrical surface of second gear is evenly equipped with recessed spiral chute that is equal with the helical tooth tooth pitch on first gear, instantaneous engagement; In the arbitrary Plane of action vertical with two Gear axis, pairing helical tooth with do not carry out between spiral chute continuing to engage, but only tangent contact on the public point of contact of two-wheeled pitch circle, instantaneous engagement, be then in separated state in other position, two gears do not have relative sliding when engaging; Helical tooth and spiral fluted helix angle enough greatly, will should ensure that two contact pointss lay respectively in different Plane of action, form tight mesh in any instantaneous all at least existence two contact pointss; In arbitrary Plane of action, the profile of tooth near contact points is involute, circular arc or straight line.
Fig. 7 is the 4th kind of concrete form figure of the present invention, is called engagement type merely.Plant in concrete form at first three, friction driving and engagement driving coexist.But theoretically, for the third concrete form, if helical tooth and spiral fluted helix angle enough large, to ensure at any instantaneous all at least existence two Instant meshing points, they lay respectively in different Plane of action, form tight mesh, just can cancel rubbing surface tangent on two friction wheels, and only rely on flank engagement just can realize not having the transmission of sliding friction.Owing to need not retain rubbing surface tangent on two friction wheels, this will bring convenience to manufacturing; Meanwhile, because eliminate friction driving, the impacting force put between two-wheeled is needed also can significantly to reduce.
Specific embodiment 3:
Frame is provided with the friction wheel of two axes intersect, the tangent contact of two friction wheels relies on frictional force to do pure rolling, the conical surface of two friction wheels is evenly equipped with respectively and protrudes and recessed pairing profile of tooth, make engaging in sphere with the arbitrary of two friction wheel axes normal, the profile of tooth of pairing does not carry out continuing engagement, but only tangent contact on the public point of contact of two pitch circles, instantaneous engagement, be then in separated state in other position; Two friction wheels do not have relative sliding when engaging, the driving mechanism that formation friction driving and engagement driving coexist.
The engagement type figure of correction when Fig. 8 is axes intersect.At first friction wheel P
1conical surface on be evenly equipped with protrusion hemi-spherical ended shape insert outside; At second friction wheel P
2conical surface on be evenly equipped with cone shape hole that is equal with the hemi-spherical ended shape insert tooth pitch on first friction wheel, instantaneous engagement; The bus of cone shape hole is straight line in the drawings; Contact points both in the great circle of hemi-spherical ended shape insert sphere, again on the seamed edge of taper hole.For the ease of representing meshing relation wherein, only depict the friction wheel part within engagement sphere in figure, Instant meshing point D
1with D
2on engagement sphere.Correcting engagement type feature is manufacture simple, friction driving and engagement driving coexist, and engagement driving is only used as the angular errors leaning on friction driving to cause between elimination twice adjacent engagement.In order to reduce the angular errors that may occur, can misplace vertically and arranging many row's hemi-spherical ended shape inserts and taper hole.
In two described friction wheels, the conical surface of first friction wheel is evenly equipped with protrusion helical tooth outside; The conical surface of second friction wheel is evenly equipped with spiral chute that is equal with the helical tooth tooth pitch on first friction wheel, instantaneous engagement; In arbitrary engagement sphere, the profile of tooth near contact points is the great circle in spherical involute, circular arc or engagement sphere; Contact points both in the inside on helical tooth surface, again on the seamed edge of spiral groove surface.
In two described friction wheels, all spiral chutes on second friction wheel all stretch out along radius and form convex spiral salient outside, make contact points appear at the inside of spiral groove surface, instead of appear on the seamed edge of spiral groove surface, become a kind of normal flank engagement state; In order to not interfere with the spiral salient on second friction wheel, on the conical surface of first friction wheel, the both sides of all helical tooths are all distributed with the auxiliary groove of spiral not participating in engaging.
Specific embodiment 4:
Frame is provided with the gear of two axes intersect, the conical surface of first gear is evenly equipped with the helical tooth of protrusion, the conical surface of second gear is evenly equipped with recessed spiral chute that is equal with the helical tooth tooth pitch on first gear, instantaneous engagement; Engaging in sphere with vertical arbitrary of two Gear axis, pairing helical tooth with do not carry out between spiral chute continuing to engage, but only tangent contact on the public point of contact of two-wheeled pitch circle, instantaneous engagement, be then in separated state in other position, two gears do not have relative sliding when engaging; Helical tooth and spiral fluted helix angle enough greatly, will should ensure that two contact pointss lay respectively in different engagement spheres, form tight mesh in any instantaneous all at least existence two contact pointss; In arbitrary engagement sphere, the profile of tooth near contact points is the great circle in spherical involute, circular arc or engagement sphere.
Above-mentioned embodiment is used for explaining and the present invention is described, instead of limits the invention, and in the protection domain of spirit of the present invention and claim, any amendment make the present invention and change, all fall into protection scope of the present invention.
Claims (2)
1. a pure rolling gear mechanism, it is characterized in that: the friction wheel being provided with two axis being parallel in frame, the tangent contact of two friction wheels relies on frictional force to do pure rolling, the cylndrical surface of two friction wheels is evenly equipped with respectively and protrudes and recessed pairing profile of tooth, make with in arbitrary Plane of action of two friction wheel axes normal, the profile of tooth only tangent contact on the public point of contact of two pitch circles of pairing, instantaneous engagement; Two friction wheels do not have relative sliding when engaging, the driving mechanism that formation friction driving and engagement driving coexist;
In two described friction wheels, all spiral chutes on second friction wheel all stretch out along radius and form protrusion spiral salient outside, make contact points appear at the inside of spiral groove surface, instead of appear on the seamed edge of spiral groove surface; In order to not interfere with the spiral salient on second friction wheel, on the cylndrical surface of first friction wheel, the both sides of all helical tooths are all distributed with the auxiliary groove of spiral not participating in engaging.
2. a pure rolling gear mechanism, it is characterized in that: the friction wheel being provided with two axes intersect in frame, the tangent contact of two friction wheels relies on frictional force to do pure rolling, the conical surface of two friction wheels is evenly equipped with respectively and protrudes and recessed pairing profile of tooth, make engaging in sphere with the arbitrary of two friction wheel axes normal, the profile of tooth only tangent contact on the public point of contact of two pitch circles of pairing, instantaneous engagement; Two friction wheels do not have relative sliding when engaging, the driving mechanism that formation friction driving and engagement driving coexist;
In two described friction wheels, all spiral chutes on second friction wheel all stretch out along radius and form protrusion spiral salient outside, make contact points appear at the inside of spiral groove surface, instead of appear on the seamed edge of spiral groove surface; In order to not interfere with the spiral salient on second friction wheel, on the conical surface of first friction wheel, the both sides of all helical tooths are all distributed with the auxiliary groove of spiral not participating in engaging.
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|---|---|---|---|
| CN201310054550.7A CN103089920B (en) | 2013-02-20 | 2013-02-20 | A kind of pure rolling gear mechanism |
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|---|---|---|---|
| CN201310054550.7A CN103089920B (en) | 2013-02-20 | 2013-02-20 | A kind of pure rolling gear mechanism |
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| CN104663036A (en) * | 2015-03-06 | 2015-06-03 | 李阳铭 | Friction wheel transmission type ridge crushing box |
| CN104763796A (en) * | 2015-03-24 | 2015-07-08 | 李立新 | Friction wheel mechanism with teeth |
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