CN102758859A - Friction type overrunning clutch - Google Patents
Friction type overrunning clutch Download PDFInfo
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- CN102758859A CN102758859A CN2012102633531A CN201210263353A CN102758859A CN 102758859 A CN102758859 A CN 102758859A CN 2012102633531 A CN2012102633531 A CN 2012102633531A CN 201210263353 A CN201210263353 A CN 201210263353A CN 102758859 A CN102758859 A CN 102758859A
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Abstract
The invention relates to a friction type overrunning clutch, belonging to mechanical transmission basic parts. A friction ring is respectively connected with an inner ring and an outer ring, both of which can rotate around a same axis, in a matching manner through a boosting transmission mechanism and a truncated-cone-shaped work friction pair. The friction type overrunning clutch is remarkably characterized in that both the boosting transmission mechanism and the truncated-cone-shaped work friction pair work in a parameter range in which the boosting transmission mechanism and the truncated-cone-shaped work friction pair cannot be locked independently by self, the boosting transmission mechanism is located in a normally-meshed state, and the work pair with matched conical faces applies initial pressure through an elastic pre-tightening assembly; and when tangential outer forces in different directions exist between the inner ring and the outer ring, the truncated-cone-shaped work friction pair is made slide and rotate or keep a static state through the effect of the boosting transmission mechanism, so that the overrunning function and the self-locking function of the overrunning clutch are realized. According to the invention, by means of adjusting design parameters, the overload trackslip protection function of the overrunning clutch is realized conveniently.
Description
Technical field
The present invention relates to the overdrive clutch device in the machine power transmission field, belong to the basic function property assembly of extensive use in the mechanical transmission.
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Background technique
Existing friction overdrive clutch technology, the most widely used is two kinds of roller-type overrunning clutch and the Wedge type over running clutch that utilizes inclined-plane wedging principle.This major defect of two kinds has: 1, all contacts are discrete higher pair contact, and contact stress is very big during wedging, causes bearing capacity very little, the Contact Pair quick abrasion, and the life-span is short.2, owing to be discrete Contact Pair, be easy to occur the situation that discrete piece can not synchronous working, very easily cause local damage and occur can not self-locking or the failure of removal of deadlock.The automatic compensation ability of 3, almost not wearing and tearing.4, it is big to surmount the resistance of state, and efficient is not high.5, need the bigger wedge power of separating after the wedging.6, sliding corner is bigger.7, complex structure, amount of parts is many, and is all very high to the coherence request of material and manufacturing, and cost is high.8, because discrete piece is many, bring high rotary speed working characteristic poor, particularly high rotating speed surmounts state, and noise is all very big with wearing and tearing.
Existing technology is owing to there is above defective; Had a strong impact on the application area of free wheel device; Can be referring to " current situation of free wheel device and trend " (the 3rd international academic conference collected works of Sino-Japan mechanical technique history of works such as Zhang Ji's political affairs; Publisher: Chinese Mechanical Engineering Society, publication time 20021028) literary composition.Can find out from the content of this article; Domestic scholars and expert have done a large amount of improvement explorations and invention work; Obtain reasonable achievement, but will reach the requirement of more satisfactory free wheel devicees such as performance, structure, reliability, cost and life-span, also had very big gap.
Document CN2175321Y discloses a kind of overrunning clutch based on screw pair and the secondary formula of conical surface friction, but does not provide the condition that realizes self-locking.
Document CN2479288Y discloses a kind of mono-directional overrun clutch based on skewed slot pivot pin and the secondary formula of conical surface friction, and also there is the low defective of bearing capacity in this clutch except that having the similar shortcoming with document CN2175321Y.
Document CN 201747821 U and CN 101936346 A disclose a kind of " space insertion type friction free wheel device "; Said as document: " according to the brand new technical principle design ", in document, do not illustrate " brand new technical principle " on the one hand is any principle actually; The document has been selected the range of structures of the self-locking of guide mechanism friction pair own; Make free wheel device when torsion is transmitted in self-locking; The axial force that produces is much larger than the power of being transmitted; Must overcome additional wedging power earlier during release, so the free wheel device of the document all has great limitation in the lifting of structural design, release performance and bearing capacity.
Summary of the invention
The present invention is directed to the above-mentioned defective of existing technology, the multiple existing mechanical technical know-how of integrated application is creatively designed the friction overdrive clutch of brand new, intends reaching following purpose:
(1) overcomes the existing above-mentioned defective that designs, promote each item performance index of free wheel device significantly.
(2), can realize having the free wheel device of overload protection function through the method for adjustment design parameter.
(3) make the free wheel device structure simpler, manufacturing is more prone to, and cost is cheaper.
In order to achieve the above object, the present invention adopts following technological scheme:
A kind of friction overdrive clutch, it comprises: ring (or interior ring member), an outer shroud (or outer ring assembly) in the friction ring of at least one power transmission (or friction ring assembly), a pretension elastic component (or pretension elastic component);
Ring, outer shroud and friction ring have the common axis of rotation line in said; Between ring, the outer shroud, match in said, form at least one and can axially contact and the second work friction pair that separates with conical surface;
Said friction ring in said, encircle and outer shroud between; The first work friction pair that at least one matches with conical surface with one of them formation, can axially contact and separate; Simultaneously there is the energizing driver structure to be connected between another with described pretension elastic component with said; Said pretension elastic component makes the energizing driver structure keep normal contact on the one hand, through the energizing driver structure work friction pair is produced when not working simultaneously and keeps elastic compression power initial, that satisfy job requirement;
Said friction ring axial limiting spare constrain in said on ring or the outer shroud, specifically with interior ring or outer shroud that said energizing driver structure is connected on;
Described pretension elastic component, the one of which end is arranged on the friction ring, the elastic compression power that all working friction pair is maintained satisfy job requirement when not working;
The first all work friction pairs and the second work friction pair have the common axis of rotation line; The cone-apex angle of each two conical surface matching of work friction pair (said cone-apex angle is exactly the angle between two limits of the vertex of a cone) is identical, but the cone-apex angle of the cone-apex angle of the second work friction pair and the first work friction pair can equate, also can be unequal; To the cone-apex angle of any work friction pair, the angle of establishing this cone-apex angle is θ, and the friction factor of work friction pair is μ
0, then conditions must be fulfilled: 2arctan (μ
0)＜θ≤180 °, arctan () the expression arctan function in the formula, this condition guarantees that said work friction pair self can self-locking.
Said energizing driver structure can be transformed into relative axial position with relatively rotating of two inter-modules that are associated with this mechanism and move, and establishes to relatively rotate angle when being φ, and axial relative position displacement distance is λ, and the friction factor of this energizing driver structure is μ
1, then conditions must be fulfilled: arctan (d λ/d φ)＞arctan (μ
1), arctan () the expression arctan function in the formula, d representes differential, this condition can guarantee that said energizing driver structure self can self-locking.
Described all the first work friction pairs and the second work friction pair are scaled a theoretic equivalence work friction pair, and establishing the outside component in tangential that occurs the self-locking direction between said interior ring and the outer shroud is F
1, through the effect of said energizing driver structure, the normal pressure that on said equivalence work friction pair, produces is F
2, the equivalent coefficient of friction of equivalence work friction pair is μ, free wheel device of the present invention realizes that the design condition of maximum load-carrying capacity is: dF
1/ dF
2≤μ; Overload of the present invention trackslip the protection design condition be: dF
1/ dF
2＞μ, the d in the formula representes differential.
Above-mentioned condition has constituted one of core of the present invention jointly; Be exactly by mechanical structure actings in conjunction of not self-locking separately, realized the unidirectional self-lock function that free wheel device needs, and the present invention be in whole bearing capacity scope; Free wheel device is in releasing process; Can not produce in the existing technology owing to have the additional release wedging power that independent self-locking mechanism institute must bring, make that not only release is light, also thoroughly eliminated the existing technology appearance can not release failure mode.
Among the present invention; The energizing driver structure; Can constitute by can will relatively rotate converting the various common mechanical transmission mechanism that relative axial position moves into, comprise but be not limited only to: the screw pair in various standards and nonstandard cross section, screw fit face, wedge fitting surface, spiral chute pin mechanism, end cam driving mechanism, hound driving mechanism, the axial wedging structure of two steel ball, the axial wedging structure of twin roller etc.
Among the present invention; The energizing driver structure; Can optimally be designed to the relative rotary motion of different direction is all converted into the structural type of axial motion; Like the energizing driver structure of screw pair structural type, can simplified design be the structural type that only relative rotary motion of a direction is converted into axial motion also, like the structural type of end cam driving mechanism.
Among the present invention; The energizing driver structure; Comprise direct intermeshing screw pair, helicoid, cammed surface, end cam drive mechanism form, and on the surface of intermeshing end face, inner peripheral surface and outer circumferential face that is formed directly into said power transmission friction ring assembly respectively and in said on the surface of axial vane surface, inner peripheral surface and the outer circumferential face of one of ring or said outer shroud.
Among the present invention; Said free wheel device also includes the position constraint assembly that is connected with said interior ring and/or outer shroud; In order to retrain said in radially relative position and the position constraint assembly of relative axial position between ring and the said outer shroud, like various rolling bearings, sliding bearing, fluid bearing etc.
Among the present invention; Each assembly of said free wheel device; Needs or restriction according to factors such as applied environment, performance requirement, volume size, manufacturing process; Both can be the single one-piece parts that satisfies said assembly function, also can be to be connected by common Der Grundsatz der Maschinen by a plurality of parts to form the structural type that satisfies said function.
Ring in of the present invention, the assembly that links together with interior ring that on the ring that also included other is set rotates ring member in forming with interior ring; Outer shroud of the present invention also is included in the assembly that links together with outer shroud that other are set on outer shroud, rotates with outer shroud, forms outer ring assembly.
Free wheel device of the present invention promotes each item performance index of free wheel device significantly; Also can simply realize overload protection through the method for adjusting design parameter; Make the free wheel device structure simpler, manufacturing is more prone to, and cost is cheaper.
Description of drawings
Fig. 1 is the simplification axial section according to unilateral bearing simple in structure of the present invention;
Fig. 2 is the simplification axial section according to the free wheel device of big bearing capacity of the present invention;
Fig. 3 is a kind of example structure of energizing driver structure of the present invention;
Fig. 4 is second kind of example structure of energizing driver structure of the present invention.
Embodiment
Explain that with describing content of the present invention and advantage will be enriched with distinct more in conjunction with the accompanying drawing in the following embodiment.
Embodiment 1:
What Fig. 1 provided is the rough schematic view of a kind of structure of friction overdrive clutch of the present invention, to the explanation of the expression among the figure as follows:
X is the spin axis of present embodiment.
1 is interior ring (or being called interior ring member); What it adopted is ring in the integrated type; 1-2 is the conical surface (frusto-conical surface) on the ring outer circumferential face in directly being processed in; 1-1 has also arranged limited ring groove 1-3 for the outside thread on the ring outer circumferential face in directly being processed on interior ring outer circumferential face, arranged directly that at the inner peripheral surface of interior ring straight spline is being connected with rotating shaft etc.
2 for outer shroud (or being called outer ring assembly), employing also be one integrated type outer shroud, 2-2 and 2-5 are the conical surface (frusto-conical surface) that directly is arranged on the outer shroud inner peripheral surface, have directly arranged the straight spline of the usefulness of doing connection at the outer circumferential face of outer shroud.
3 is friction ring (power transmission friction ring assembly); 3-1 is for directly being arranged in the internal thread on the friction ring inner peripheral surface; Be meshed with the outside thread 1-1 on interior ring 1 outer circumferential face, constitute the screw pair transmission, 3-5 is for directly being arranged in the conical surface (frusto-conical surface) on the friction ring outer circumferential face.This screw pair can not only convert relatively rotating between friction ring 3 and the interior ring 1 into axial relative displacement, can also convert relative rotating force to relative shaft orientation force, and can make relative shaft orientation force greater than relative rotating force.This screw pair is exactly the energizing driver structure of present embodiment of the present invention.
5 is the axial position bounding means of friction ring, selects elastic circlip etc. usually for use, matches with being arranged in the interior limited ring groove that encircles on 1, is arranged in this limited ring groove.
7 are pretension elastic component (specifically selecting torsion spring for use), and the one of which end is arranged on and (is pressed on the friction ring 3) on the friction ring 3, give an elastic acting force; Concrete structure among the figure; Be to be arranged between axial position bounding means 5 and the friction ring 3; Promptly between interior ring 1 and friction ring 3; Be connected with axial limiting spare with friction ring, perhaps be connected with the interior ring or the outer shroud that are connected with said energizing driver structure, the elastic compression power that all working friction pair is maintained satisfy job requirement when not working with friction ring;
The friction ring 3 of present embodiment is between interior ring 1 and outer shroud; The second work friction pair is made up of conical surface 1-2 and the conical surface 2-2 that cone-apex angle equates; The first work friction pair is made up of conical surface 2-5 and the conical surface 3-5 that cone-apex angle equates; The cone-apex angle of conical surface (frusto-conical surface) all must satisfy the condition in the claim, selects such parameter, and purpose is in order to reach when external force disappears; The effect that additional pressure between friction pair also just disappears thereupon, the friction pair itself of just working can self-locking.
This embodiment's energizing driver structure is made up of with the screw pair that screw thread 3-1 meshes screw thread 1-1; This screw pair also must satisfy the condition in the claim, guarantees that promptly this screw pair self can self-locking, and this screw pair is preferably selected trapezoidal thread or square threaded form; Reach transmission efficiency height, purpose that structural strength is high; Certainly, also can be as required or the situation of condition restriction, select all standards or the worm structure in nonstandard cross section.
Though this embodiment has selected for use torsion spring as pretension elastic component 7; Because energizing driver structure of the present invention can self-locking; This is just for to select for use the pretension elastic component of axial reinforcing to realize that the elasticity pretension of work friction pair is achieved, like elastic elements such as butterfly spring, rubber.
During engineering design, described all the first work friction pairs and the second work friction pair are scaled a theoretic equivalence work friction pair, establishing the outside component in the tangential that occurs the self-locking direction between said interior ring and the said outer shroud is F
1, the normal pressure that on said equivalence work friction pair, produces is F
2, the equivalent coefficient of friction of equivalence work friction pair is μ, as the dF that satisfies condition
1/ dF
2During≤μ, free wheel device of the present invention just can keep the free wheel device function in the bearing capacity scope; As the dF that satisfies condition
1/ dF
2 ＞During μ, free wheel device of the present invention just can be realized the function that overload is trackslipped and protected; D in the above-mentioned formula representes differential.
When this free wheel device is selected above-mentioned dF
1/ dF
2During≤μ condition; Working procedure is, through pretension elastic component 7 (torsion spring) with axially put spacing elastic circlip 5, two work friction pairs that conical surface 1-2,2-2 and 2-5,3-5 are constituted keep in touch simultaneously and have a suitable initial elasticity impacting force; When interior ring 1 relatively rotates with outer shroud 2 or rotates trend; If this sense of rotation or trend, the effect of the screw pair that meshes through screw thread 1-1 and 3-1 makes friction ring 3 friction pair of will working press tighter and tighter; The work friction pair can keep state of rest, has promptly realized self-locking; Otherwise, if above-mentioned relatively rotating or rotation trend when opposite, through the effect of above-mentioned screw pair; The initial pressure that friction ring 3 is understood the friction pair of will working reduces more, and the work friction pair will produce and trackslip, and Here it is surmounts state; It is thus clear that this unilateral bearing has been realized the unidirectional power transmission of sense of rotation.
In order to make this unilateral bearing formula free wheel device proper functioning, need suitable lubricated, so preferably on the rubbing surface that the conical surface of work friction pair forms, reticulate pattern or 8 font groove lubrication channels such as (oil grooves) are set.
Because this unilateral bearing formula free wheel device is simple in structure, in self-locking with surmount in the process, between interior ring 1 and the outer shroud 2 very little axial displacement is arranged.Can be connected with input output with forms such as splines through interior ring 1 or outer shroud 2, eliminate the influence of axial displacement.In addition, if desired, rolling bearing or sliding bearing can also be set between interior ring 1 and outer shroud 2 support and locate, promptly rolling bearing or sliding bearing can also seal oiling agent as the position constraint assembly.
If the permission of the service condition of present embodiment can also be cancelled and axially put spacing elastic circlip 5, directly pretension elastic component 7 (torsion spring) is sticked in the spacing hole that is arranged on the interior ring 1.
If the permission of the service condition of present embodiment can also make the straight spline on interior ring 1 and the outer shroud 2 into keyway, perhaps cancellation, interior ring 1 can be made solid, and this just can be referred to as interior axle.
Said energizing driver structure; Can directly be meshing with each other and constitute by being formed directly into the structure shape that directly forms on ring in said that structure shape on the said friction ring is connected with said energizing driver structure or the said outer shroud; Said structure shape can be any one structure shape in screw thread, axial screw face and the axial wedge face in standard section and nonstandard cross section; Also can by be formed directly into the structure shape on the said friction ring and be formed directly into ring in be connected with said energizing driver structure said or said outer shroud on structure shape and other part between these two said structure shapes constitute jointly, can be axial screw groove pin structure, axially one of hound structure, the axial wedging structure of two steel ball, the axial wedging structure of twin roller and rolled threads structure; Said energizing driver structure in converting motion, also decomposes the tangential force between said friction ring and the said interior ring, produces mutual axial thrust load.
Present embodiment has adopted screw pair formula energizing driver structure, and establishing this lead angle is ψ, this screw pair be ρ from the locking angle, according to conditional request of the present invention, then must satisfy: ψ＞ρ, work in non-self-locking scope to guarantee this screw pair.
Each said work friction pair comprises two structures that rubbing surface constitutes that only formed by two conical surfaces that match; Also comprise the plural rubbing surface that forms by interfolded, by the situation of traditional multidisc clutch structural type institute interfolded formation.
Pretension elastic component 7 comprises that at least one is processed the elastic element of torsion spring, stage clip, dish spring, wavy spring, springs structural type by metal or rubber elastomeric material.
Have at least a position constraint assembly with said in ring and/or outer shroud be connected, in order to retrain said in relative radial position and position to axial between ring and the said outer shroud; This position constraint assembly is the structural type of common rolling bearing, sliding bearing and fluid bearing; This position constraint assembly can be set directly between the said interior ring and said outer shroud of said free wheel device, also can be arranged between the external agency's component that are connected with the said interior ring and the said outer shroud of said free wheel device.
Need to prove: these unilateral bearing component are few, simple in structure, and obviously manufacturability is very good, and processing is smart to guarantee that easily sliding corner is little, and bearing capacity is strong.Even machining accuracy is lower, also only sliding corner and bearing capacity there are some slight influences, but to the almost not influence of mono-directional overrun function.
And above-mentioned described surmounting, the situation during in the opposite direction when being above-mentioned tangential exterior portions force direction and self-locking state, present embodiment has been selected the energizing driver structure of screw pair structure for use, and the pressure between the rubbing surface that makes the work friction pair is initiatively reduced.When the outside component in the tangential of this direction during greater than the frictional force between friction pair, will relatively rotate around common rotation axis X between interior ring 1 and the outer shroud 2, free wheel device is in and surmounts state.
When free wheel device is in said surmounting under the state status, the outside component in the tangential of this direction can only be between interior ring 1 and outer shroud 2, and transmission is smaller or equal to the power of the maximal friction between friction pair each other.To surmount that the maximal friction between friction pair converts moment of torsion under the state, this moment of torsion be exactly everybody usual statement free wheel device surmount moment of torsion.
Because we are referred to as release from self-locking state to the transient process that surmounts state with free wheel device usually; Friction overdrive clutch of the present invention is not owing to there is the independent mechanism of ability self-locking; If adopt the two-way energizing driver structure of the secondary formula of screw thread-like can also realize initiatively release, this also is one of core of the present invention.
In addition; Friction overdrive clutch of the present invention; The work friction pair all is the form of face contact, when surmounting work, is easy to just can between the rubbing surface of work friction pair, form lubricant film; Make the wearing and tearing of rubbing surface of work friction pair approach zero, so can surmount under the state at a high speed by long-play.This also is one of characteristic of the present invention.
Friction overdrive clutch of the present invention; By above-mentioned description to the energizing driver structure; If adopt the energizing driver structure of screw pair formula; Can be in a big way the wearing and tearing of compensation work friction pair automatically, it is insensitive to make that the functional characteristic of this structure changes the parameter of component, this also is one of characteristic of the present invention.
Friction overdrive clutch of the present invention can reach almost axially holohedral symmetry, full rigid structural characteristics, so can adapt to high speed and ultra high speed running, maximum speed only depends on the size and the dynamic balancing level of the strength of materials, institute's transmitting torque.
The description in the relevant document in technical background according to the present invention; Maximum sliding corner be appreciated that for: be 0 angle from surmounting status transition to the relative position of the sense of rotation in the static relatively moment between ring 1 and the outer shroud 2 in establishing; When carrying out the transition to the bearing capacity state again, the relative angle that is turned between interior ring 1 and the outer shroud 2.
The maximum sliding corner of friction overdrive clutch of the present invention depends primarily on oil slick thickness and the aspects such as structural elasticity amount of deformation after the self-locking and self-locking time when self-locking begins between the rubbing surface of matching gap and precision, all working friction pair of energizing driver structure; Through the corresponding techniques means, can be easily with first three controlling factors of the sliding corner that has the greatest impact in claimed range.
Certainly, can also derive a lot of other structural type with free wheel device function by above this citation form structure, the embodiment of back will describe and explain the part distressed structure.
Embodiment 2: shown in Figure 2 is the free wheel device of big bearing capacity, to the explanation of the expression among the figure as follows:
X is the spin axis of present embodiment.
Conical friction face 1-1,1-2,1-3 and conical friction face 2-1,2-2,2-3 are staggeredly placed by shown position, and two adjacent conical surfaces cooperatively interact, and constitute six work friction pairs (belonging to the second work friction pair).
Friction ring 3 is between interior ring 1 and outer shroud 2; Outer circumferential face at friction ring 3 has directly been processed outside thread 31; Be screw pair with 21 engagements of internal thread on the outer shroud 2, constituted this routine energizing driver structure, directly processed conical surface on the inner peripheral surface of friction ring 3; Rubbing surface as the work friction pair; The conical surface of conical friction face 1-3 on this conical surface and the interior ring 1 matches, and has formed the first work friction pair of present embodiment, and the friction pair that other contacted conical surface constitutes is the second work friction pair.
Axial position bounding means 5 is the axial position bounding means of friction ring 3, is a spacing end cap of axial position among the figure; Spacing end cap of this axial position and outer shroud 2 are by shown in the figure; Connect with bolt, can regard a part as, or be arranged on the outer shroud 2 as outer shroud 2.
7 is the pretension elastic component, is specially torsion spring, is arranged between axial position bounding means 5 and the friction ring 3, also can think between outer shroud 2 and friction ring 3, for all working friction pair provides initial elastic compression power.
This example is provided with roller bearings, and as the position constraint assembly between interior ring 1 and the outer shroud 2, interior ring 1 does not have external axial displacement and axial force in the course of the work with outer shroud 2.
The friction ring 3 of present embodiment forms the energizing driver structure of screw pair structure between friction ring 3 and the outer shroud 2 between interior ring 1 and outer shroud 2, first friction pair of working that forms between friction ring 3 and the interior ring 1 that conical surface matches; Formed a plurality of second work friction pairs between interior ring 1 and the outer shroud 2, can transfer larger torque.
As can be seen from the figure; This free wheel device has six work friction pairs; Equivalent coefficient of friction has also just obtained increase; This just makes the lift angle of screw pair of energizing driver structure can get bigger value, and the favourable face that brings is: the stress of all component all is reduced, so can transmit very large moment of torsion.Negative effect is that sliding corner is amid a sharp increase.
From figure, it can also be seen that also there are not the component of high technology difficulty among this embodiment, utilize the existing mechanical manufacturing process just can produce in batches.
Fig. 3, the energizing driver structure concrete structure shown in 4, shown in Figure 3 is a kind of energizing driver structure of axial hound structure, is arranged between friction ring 3 and interior ring 1 or the outer shroud 2, replaces aforesaid screw pair formula energizing driver structure, also can realize the object of the invention.Shown in Figure 4 is the energizing driver structure of the axial wedging structure of a kind of pair of steel ball or twin roller formula, is arranged between friction ring 3 and interior ring 1 or the outer shroud 2, replaces aforesaid screw pair formula energizing driver structure, also can realize the object of the invention.
Explanation is at last; Above embodiment is only unrestricted in order to technological scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technological scheme of the present invention; And not breaking away from the aim and the scope of technological scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (9)
1. friction overdrive clutch, it comprises: interior ring, outer shroud, friction ring and pretension elastic component; It is characterized in that:
Ring, outer shroud and friction ring have the common axis of rotation line in said;
Said friction ring is between interior ring and outer shroud; One of them matches friction ring and interior ring and outer shroud with conical surface; Form the first work friction pair that at least one can axially contact and separate, friction ring with wherein be connected formation energizing driver structure between another with the energizing driver structure;
In said, between ring and the outer shroud, be provided with a conical surface that matches respectively at least, form at least one and can axially contact and the second work friction pair that separates;
Described pretension elastic component, the one of which end is arranged on the friction ring, the elastic compression power that all working friction pair is maintained satisfy job requirement when not working;
The described first work friction pair and the second work friction pair have the common axis of rotation line; The cone-apex angle of two conical surfaces that each work friction pair matches is identical; Second work friction pair cone-apex angle and first work friction pair cone-apex angle can equate, also can be unequal; To any one first or second work friction pair cone-apex angle, the angle of establishing this cone-apex angle does
θ, the friction factor of friction pair is μ
0, then conditions must be fulfilled: 2arctan (μ
0)<
θ≤180 °, arctan () in formula expression arctan function, this condition guarantees that said work friction pair self can self-locking;
Said energizing driver structure; Become relative axial position to move the angular transformation that relatively rotates between said friction ring and said interior ring that is connected with the energizing driver structure or the outer shroud; If relatively rotate angle when being φ; The relative axial position displacement distance that produces is λ, and the friction factor of this energizing driver structure is μ
1 ,Then conditions must be fulfilled: arctan (d λ/d φ)＞arctan (μ
1)
,Arctan () in formula expression arctan function, d representes differential, this condition guarantees that said energizing driver structure self can self-locking;
Described all the first work friction pairs and the second work friction pair are scaled a theoretic equivalence work friction pair, and establishing the outside component in tangential that occurs the self-locking direction between said interior ring and the outer shroud is F
1, through the effect of said energizing driver structure, the normal pressure that on said equivalence work friction pair, produces is F
2, the equivalent coefficient of friction of equivalence work friction pair is μ, described free wheel device realizes that the design condition of maximum load-carrying capacity is: dF
1/ dF
2≤μ; The overload of described free wheel device trackslip the protection design condition be: dF
1/ dF
2 ＞μ, the d in the formula representes differential.
2. by the described free wheel device of claim 1; It is characterized in that: said energizing driver structure; Can directly be meshing with each other and constitute by being formed directly into the structure shape that directly forms on ring in said that structure shape on the said friction ring is connected with said energizing driver structure or the said outer shroud; Said structure shape can be any one structure shape in screw thread, axial screw face and the axial wedge face in standard section and nonstandard cross section; Also can by be formed directly into the structure shape on the said friction ring and be formed directly into ring in be connected with said energizing driver structure said or said outer shroud on structure shape and the associated mechanical part between these two said structure shapes constitute jointly, can be axial screw groove pin structure, axially one of hound structure, the axial wedging structure of two steel ball, the axial wedging structure of twin roller and rolled threads structure; Said energizing driver structure in converting motion, also decomposes the tangential force between said friction ring and said interior ring or the outer shroud, produces mutual axial thrust load.
3. by the described free wheel device of claim 1; It is characterized in that: each said work friction pair comprises two structures that rubbing surface constitutes that only formed by two conical surfaces that match; Or comprise the plural rubbing surface that forms by interfolded, the structure that is constituted by traditional multidisc clutch structural type.
4. by the described conical surface friction overdrive clutch of claim 1; It is characterized in that: with said friction ring be connected with the energizing driver structure said in the ring or outer shroud on; Be provided with friction ring axial limiting spare; Said friction ring axial limiting spare is connected through annular groove with described interior ring or outer shroud, to limit the shaft orientation moving range of said friction ring.
5. by the described conical surface friction overdrive clutch of claim 4; It is characterized in that: described pretension elastic component; Be arranged between friction ring axial limiting spare and the friction ring; Perhaps be connected the elastic compression power that all working friction pair is maintained satisfy job requirement when not working with the interior ring or the outer shroud that are connected with said energizing driver structure with said friction ring.
6. by each described free wheel device of claim 1～5, it is characterized in that: said pretension elastic component comprises that at least one is processed the elastic element of torsion spring, stage clip, dish spring, wavy spring, springs structural type by metal or rubber elastomeric material.
7. by the arbitrary described free wheel device of claim 1～5, it is characterized in that: on the rubbing surface that the conical surface of said work friction pair forms, be provided with channel shaped or reticulate pattern shape oil leab.
8. by the arbitrary described free wheel device of claim 1～5; It is characterized in that: comprise at least a position constraint assembly with said in ring and/or said outer shroud be connected, in order to constraint or limit said in relative radial position and position to axial between ring and the said outer shroud.
9. by the described free wheel device of claim 8; It is characterized in that: said position constraint assembly is the structural type of common rolling bearing, sliding bearing and fluid bearing; This position constraint assembly can be set directly between the said interior ring and said outer shroud of said free wheel device, also can be arranged between the external agency's component that are connected with the said interior ring and the said outer shroud of said free wheel device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210263353.1A CN102758859B (en) | 2012-07-27 | 2012-07-27 | Friction overdrive clutch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210263353.1A CN102758859B (en) | 2012-07-27 | 2012-07-27 | Friction overdrive clutch |
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| CN102758859A true CN102758859A (en) | 2012-10-31 |
| CN102758859B CN102758859B (en) | 2015-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210263353.1A Expired - Fee Related CN102758859B (en) | 2012-07-27 | 2012-07-27 | Friction overdrive clutch |
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| CN102927157A (en) * | 2012-11-14 | 2013-02-13 | 罗俊 | One-way transmission device with buffer function |
| CN104838164A (en) * | 2012-07-27 | 2015-08-12 | 重庆大易用机械有限公司 | Conical surface friction type overrunning clutch |
| CN105587797A (en) * | 2015-02-04 | 2016-05-18 | 洪涛 | Spatial wedge-typed overrunning pulley capable of reducing torsional vibration and overrunning clutch |
| CN109185360A (en) * | 2017-08-27 | 2019-01-11 | 骆兰珍 | A kind of clutch with elastic card |
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|---|---|
| CN102758859B (en) | 2015-09-09 |
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