CN101328952B - Power transmission chain and power transmission device using the same - Google Patents

Abstract

An object of the invention is to provide a power transmission chain capable of effectively reducing noises and a power transmission assembly using the same. In the power transmission chain including plural links each possessing through-holes and plural pins inserted through the through-holes for interconnecting the plural links, all the plural pins substantially have the same longitudinal length while the plural pins include plural types of pins which have mutually different rigidities against force acting in the pin longitudinal direction. Furthermore, a locus of contact position between the pin and a strip is defined by an involute of a circle. The pins and strips are combined to form two or more types of pairs which provide the involutes of base circles having different radii.

Description

Power transmission chain and adopted the power transmission of this chain

The application is at application number: 2004800294103, the applying date: on October 18th, 2004 and denomination of invention: power transmission chain and the dividing an application of power transmission of having adopted this chain.

Technical field

The present invention relates to be used for vehicle chain-type continuously variable transmission etc. power transmission chain and adopted the power transmission of this power transmission chain.

Background technique

As auto continuously variable transmission (CVT:Continuously Variable Transmission), such as following speed changer is arranged, it has: be arranged at motor one side drive pulley, be arranged at driving wheel one side follow-up pulley, be erected at the endless belt-shaped chain between these two pulleys.As this power transmission chain, a kind of a plurality of chain pins that have a plurality of chain links and interconnect these chain links are arranged.In this so-called chain-type continuously variable transmission, the contact friction force by roughly acting between the chain pin end face of the sheave face formed of two conical surfaces of opposite disposed and chain in the inboard of each pulley produces tractive force, and transmission power.Under the occasion that has, also on the chain length direction every predetermined distance, as the parts that are independent of chain pin the chain friction transmission part is set, and produces tractive force by the contact friction force that between the both ends of the surface of this chain friction transmission part and sheave face, acts on, and transmission power.Like this, make the roughly variation continuously of the distance (furrow width) between the sheave face of opposed conical surface in each drive pulley and the follow-up pulley, thereby continuously change the effective diameter of each pulley.Its result, gear ratio (stepless) continuously change, and carry out stepless change with the level and smooth action that is different from existing gear type.

In this chain-type continuously variable transmission, when chain pin of the chain that is set up etc. enters into the sheave face of each pulley and with the sheave emaciated face from the time, can produce undesirable sound.Especially, when chain pin entered into the sheave face, chain pin can conflict mutually with the sheave face, and produced sound.Because pitch is provided with a plurality of chain pins in accordance with regulations on the belt length direction of chain, thereby these a plurality of chain pins just can be successively clash with the sheave face continuously, and generation sound.

In common chain, because the length of a plurality of chain pins is identical mutually, thereby all chain pins just can similarly conflict with the sheave face mutually.Like this, the frequency of the sound that produces because of the conflict of each chain pin just about equally, thereby the sound that produces under this frequency just can increase, and causes sound pressure level to increase.For this reason, proposed a kind of invention in the clear 63-53337 communique of TOHKEMY, it is by adopting the different a plurality of chain pins of length, disperses the sound frequency that produced, perhaps by suppressing sympathetic response, reduces sound pressure level.

In the flat 8-312725 communique of TOHKEMY, as the power transmission chain that stepless speed variator is used, proposing has following transmission chain, and this transmission chain comprises: a plurality of chain links, and it has first and second through hole of arranging on the chain length direction; A plurality of chain pins and a plurality of middleware, it is by connecting from second through hole of first through hole of a chain link and other chain link, make at the chain link of arranging on the chain width direction and on the chain length direction, connect each other flexiblely, wherein, be fixed in first through hole of a chain link and be embedded into chain pin in second through hole of other chain link movably, with in first through hole that is embedded into a chain link movably and be fixed in middleware in second through hole of other chain link, the contact of relatively rolling is moved, can realize aforementioned bending thus, and the sectional shape of chain pin side, become round involute in contact segment with middleware.

Yet, in the described aforementioned invention of the clear 63-53337 communique of TOHKEMY, exist the long-chain pin and compare the shortcoming that is easier to concentrate wearing and tearing with the short chain pin.Under this occasion, owing to being easy to concentrate wearing and tearing, the long-chain pin shortens, thereby the disappearance of length missionary society, so noise reduction can reduce in the middle of using, and can not obtain effect of sufficient.In addition, owing to compare with the short chain pin, the power that acts on the long-chain pin is bigger, thereby can concentrate burden on the long-chain pin, thereby causes the durability of chain to worsen.In addition, in the chain assembly process, must manage, perhaps they be distinguished and assemble, thereby can strengthen the assembling burden, thereby cause cost to raise up the different chain pin of length.

In addition, in the described power transmission chain of the flat 8-312725 communique of TOHKEMY, because chain is not a continuum, but a kind of structure that is connected with a plurality of chain links, thereby the polygon that suppresses to be produced is vibrated the sound that is produced when suppressing to turn round thus.Yet such as carrying occasion on the vehicle etc. at the stepless speed variator that will adopt this power transmission chain down, the quietness when as far as possible improving running needs further to reduce the sound that power transmission chain produces.

Summary of the invention

The present invention finishes in view of the above mentioned facts, and its purpose is to provide a kind of power transmission chain that can effectively reduce the sound of generation.

Specifically, first purpose of the present invention is, provides a kind of chain pin length identical in fact, and can effectively reduce the power transmission chain of the sound of generation.Second purpose of the present invention is, a kind of power transmission chain of the sound that produces can further reduce the sound that vibration produces based on polygon and effectively suppress running the time is provided and adopted the power transmission of this power transmission chain.

For reaching aforementioned purpose, especially for reaching aforementioned first purpose, the power transmission chain of first invention comprises among the present invention: a plurality of chain links with through hole; A plurality of chain pins, it is inserted and to lead in aforementioned through hole and interconnect aforementioned a plurality of chain link, this power transmission chain is erected at first pulley with conical surface-shaped sheave face and has between second pulley of conical surface-shaped sheave face and uses, and the both ends of the surface of aforementioned chain pin contact with the sheave face of aforementioned first and second pulley and transmit power, this power transmission chain is characterised in that: aforementioned a plurality of chain pins comprise multiple chain pin, the length that this multiple chain pin is the chain pin length direction is identical in fact, and different at the rigidity of the power that acts on the chain pin length direction.Like this, utilize the different a plurality of chain pins of rigidity, the sound pressure level of the sound that under the identical in fact state of chain pin length, reduces to produce, this principle aftermentioned.

The length of so-called chain pin length direction is identical in fact, means the length direction length of a plurality of chain pins, is within the margin of error that is produced when making same length with usual method.

First power transmission chain of investigating from another viewpoint of inventing has: a plurality of chain links; Interconnect a plurality of chain pins of these a plurality of chain links, this power transmission chain is erected at first pulley with conical surface-shaped sheave face and has between second pulley of conical surface-shaped sheave face and uses, and the both ends of the surface of aforementioned chain pin contact with the sheave face of aforementioned first and second pulley and transmit power, this power transmission chain is characterised in that: aforementioned a plurality of chain pins comprise multiple chain pin, the length that this multiple chain pin is the chain pin length direction is in fact all identical, and the sectional shape or the section area in the cross section vertical with the chain pin length direction are different.Like this, same with aforementioned invention, utilize the different a plurality of chain pins of rigidity, the sound pressure level of the sound that under the identical in fact state of chain pin length, reduces to produce, its principle aftermentioned.

In addition, for " sectional shape or section area are different " here, at the chain pin that contrasts each other, under the occasion that in each identical cross section of chain pin lengthwise location, the sectional shape or the section area of two chain pins is compared, even the sectional shape in one of them cross section or section area are different, just think also to be equivalent to " sectional shape or section area are different ".

In aforementioned first invention, aforementioned a plurality of chain pin also can comprise multiple chain pin respectively, this multiple chain pin each locational aforementioned sectional shape of chain pin length direction and aforementioned section area in single chain pin is roughly the same on the whole length of this chain pin, and at a plurality of chain pins each other, aforementioned section area is different.Under this occasion, to compare with sectional shape and section area different occasion on each position of chain pin length direction, the chain pin shape is more simple, thus chain pin is easier to make.

The different aforementioned invention of the section area of chain pin also can constitute: aforementioned a plurality of chain pins are included in the different multiple chain pin of chain length direction width in the aforementioned cross section, and, aforementioned a plurality of chain link comprises the different multiple chain link of its pitch, in addition, the chain link that aforementioned pitch is long is more inserted the wide more chain pin of width that is connected with aforementioned chain length direction.Like this, can form the chain link of length, have multiple chain pin and the different chain of pitch and be easy to design corresponding to the chain length direction width of chain pin.

The so-called pitch here means the interval on the mutual chain length direction of the logical chain pin of single chain link interpolation.This pitch is the mutual interval of chain pin at the contact place of chain pin and fillet, in addition, under the unbent state of chain (state that stretches fully), measures aforementioned pitch.

In aforementioned first invention, in the different aforementioned multiple chain pin of aforementioned section area, this section area of the chain pin of aforementioned section area maximum, 1.1 times～2 times of this section area of the chain pin of preferably aforementioned section area minimum.If be below 1.1 times, then exist and to give full play to the tendency that poor effect is set at section area, if and be more than 2 times, then exist between chain pin and the chain pin the chain length direction at interval (pitch) can increase and tendency that the sound of generation is increased, but in the present embodiment can this thing happens.

For reaching aforementioned purpose, especially for reaching aforementioned second purpose, the power transmission chain of second invention among the present invention, be erected at first pulley and have between second pulley of conical surface-shaped sheave face and use with conical surface-shaped sheave face, and, the end face of a plurality of chain friction transmission parts that on the chain length direction, are provided with every predetermined distance, contact with the sheave face of aforementioned first and second pulley and to transmit power, this power transmission chain is characterised in that: have: a plurality of chain links, and it has first and second through hole of arranging at the chain length direction; A plurality of first chain pins and a plurality of second chain pin, this chain pin is by first through hole of a chain link of perforation and second through hole of other chain link, the chain link of arranging on the chain width direction is connected at the chain length direction each other flexiblely, wherein, be fixed in first through hole of a chain link and be embedded in aforementioned first chain pin in second through hole of other chain link movably, with in first through hole that is embedded in a chain link movably and be fixed in aforementioned second chain pin in second through hole of other chain link, contact is moved relative to rolling, can realize aforementioned bending thus, and, form the combination of two or more first chain pin and second chain pin, in this combination, the track of the contact position of these first chain pins and second chain pin becomes round involute, and the basic circle radius of this involute is different, in addition, aforementioned a plurality of chain friction transmission part comprises the different multiple chain friction transmission part of rigidity at the power of chain width direction.

Like this, the contact position track of first chain pin and second chain pin becomes round involute, can suppress the polygon vibration thus.In addition, owing to be provided with the different first two or more chain pin of the basic circle radius of this involute and the combination of second chain pin, thereby can suppress the resonance of polygon vibration, thereby can further improve effect based on the sound of the inhibition generation of involute.In addition, by adopting the different multiple chain friction transmission part of rigidity, can be dispersed in the frequency of the sound that is taken place when the chain friction transmission part contacts with the sheave face of pulley, and can reduce the sound pressure level peak value of the sound of this generation.

The chain friction transmission part of aforementioned second invention, it is in fact all identical also can to constitute its length direction length.Like this, can realize that a kind of end face eccentric wear of specific chain friction transmission part is suppressed to minimum, and keep the power transmission chain of its performance in can be during long.

So-called length direction length is identical in fact, means the length direction length of a plurality of chain friction transmission parts, is within the margin of error that is produced when making same length with usual method.

In aforementioned second invention, also can constitute: aforementioned a plurality of chain friction transmission parts comprise the sectional shape or the different multiple chain friction transmission part of section area in the cross section vertical with the chain width direction.

Like this, can easily make the mutual aforementioned rigidity of chain friction transmission part different.

For " sectional shape or section area are different " here, at the chain friction transmission part that contrasts each other, respectively under the occasion that in each identical cross section of its chain width position, the sectional shape or the section area of two chain friction transmission parts is compared, even the sectional shape in one of them cross section or section area are different, just think to be equivalent to " sectional shape or section area are different ".

In second invention, also can constitute: aforementioned first chain pin or aforementioned second chain pin are the transmission chain pins of the aforementioned chain friction transmission part of double as.Like this, needn't be in addition and chain pin the chain friction transmission part is set independently, thereby can reduce the components number of power transmission chain, simplify assembly process.

In second invention, also can constitute: a plurality of aforementioned transmission chain pins are included in the different multiple transmission chain pin of chain length direction width on the vertical cross section of chain pin length direction, and aforementioned a plurality of chain links comprise the different multiple chain link of its pitch.Under this occasion, owing to can constitute: in the long more chain link of aforementioned pitch, insert the wide more chain pin of width that is connected with on the aforementioned chain length direction, thereby can form the chain link of its length corresponding to the chain length direction width of transmission chain pin.Like this, can easily design and have multiple transmission chain pin and the different power transmission chain of pitch.

In addition, because the pitch of chain link is different, thereby can easily make as the chain length direction pitch of the transmission chain pin of friction transmission part different.Under the different occasion of chain length direction pitch of transmission chain pin and since transmission chain pin and pulley to contact pitch also different, thereby the cycle of the sound that takes place because of transmission chain pin and contacting of pulley just obtain dispersion, thereby reduce the sound pressure level peak value that taken place.In addition, constituting in the long more chain link of pitch, slotting being connected with under the occasion of the wide more transmission chain pin of chain length direction width is easy to make the pitch of transmission chain pin different, and make at the rigidity of power of the chain width direction of transmission chain pin differently, can further improve noise reduction.

The so-called pitch here means the interval on the mutual chain length direction of the logical chain pin of single chain link interpolation.This pitch is the mutual interval of chain pin at the contact place of first chain pin and second chain pin, adjusts by being located at first through hole in the single chain link and the distance of second through hole.In addition, under the unbent state of chain (state that stretches fully), measure this pitch.

Relating to the present invention of power transmission, is a kind of power transmission, and it comprises: first pulley with conical surface-shaped sheave face; Second pulley with conical surface-shaped sheave face; Be erected at the power transmission chain between these first and second pulleys, this power transmission is characterised in that: aforementioned power transmission chain is the arbitrary described power transmission chain of aforementioned first or second invention.

Like this, owing to adopted aforementioned each power transmission chain, thereby the sound that produces can realize a kind of the action time power transmission with action effect of aforementioned each chain such as less.

In aforementioned second invention, any one is under the occasion of transmission chain pin at first chain pin and second chain pin, one side of the transmission chain pin in these first chain pins and second chain pin, be commonly referred to as " chain pin ", rather than a side of transmission chain pin, then be commonly referred to as " fillet (strip) " or " inserting member (interpiece) ".For this reason hereinafter, abbreviate transmission chain pin one side in first chain pin or second chain pin as " chain pin ", and will not be that transmission chain pin one side is called " fillet ".

As mentioned above, power transmission chain that the present invention relates to and power transmission can effectively reduce the sound of generation.Especially in first invention, rigidity by making chain pin and section area etc. are different, can effectively reduce the sound of generation under the identical in fact state of chain pin length.According to aforementioned second invention, owing to form different first and second the two or more chain pin combination of the basic circle radius of the involute that is in contact with one another location track, and make the rigidity of chain friction transmission part different, thereby can reduce the polygon vibration, and the sound pressure level peak value of the sound that can suppress to produce.

Description of drawings

Fig. 1 is the stereogram that the major component of the chain of representing that typically the chain-type continuously variable transmission that relates to of a mode of execution of first invention and second invention is used constitutes.

Fig. 2 is the side view of the chain of Fig. 1.

Fig. 3 is that expression has been adopted in the power transmission of the chain that the comparative example 1 of first invention relates to, generated the plotted curve of the sound pressure level under each frequency of sound.

Fig. 4 is that expression has been adopted in the power transmission of the chain that first inventive embodiment 1 relates to, generated the plotted curve of the sound pressure level under each frequency of sound.

Fig. 5 is the side view of chain link used in the chain of Fig. 1.

Fig. 6 is in the chain of Fig. 1, inserts the side view of the state of chain pin and fillet in chain link.

Fig. 7 is in the chain of presentation graphs 1, the figure of the rolling of chain pin and fillet contact move mode.

Fig. 8 is the figure of the chain pin track when representing that in the past common power transmission chain is wound up on the pulley.

Fig. 9 is the plotted curve of pitch and relationship of amplitude in the common power transmission chain of representing in the past.

Figure 10 is the plotted curve of the relation of pitch and entering angle in the common power transmission chain of representing in the past.

Figure 11 is the plotted curve of the universal relation of expression basic circle radius of involute and amplitude.

Figure 12 is the plotted curve of the universal relation of expression basic circle radius of involute and entering angle.

Figure 13 is in second invention, the plotted curve that the sound that is produced in the power transmission of embodiment and comparative example compares.

Figure 14 is the figure that is used to illustrate preferred involute shape.

Figure 15 is the stereogram that the summary of the expression chain-type continuously variable transmission that adopted the chain that an embodiment of the present invention relates to constitutes.

Figure 16 is the sectional view of the stepless speed variator middle pulley part of Figure 15.

Figure 17 is the figure of a mode of execution of the chain link that is connected with second through hole of expression first through hole.

Figure 18 is the figure of another mode of execution of the chain link that is connected with second through hole of expression first through hole.

Embodiment

Below, with reference to accompanying drawing embodiments of the present invention are described.

Fig. 1 is a stereogram of representing typically among the present invention that chain (hereinafter to be referred as " chain ") major component that chain-type continuously variable transmission that a mode of execution of first invention relates to is used constitutes.The chain 1 that present embodiment relates to is whole for endless belt-shaped, and by constituting with the bottom: a plurality of metallic chain links 2; Be used to interconnect a plurality of metallic chain pins 3 of these chain links 2; A plurality of fillets 5 that chain length direction length is slightly shorter than these chain pins 3.Chain link 2 and chain pin 3 are such as being formed by metals such as Bearing Steels.Among Fig. 1, part has been omitted near the approximately chain link description of central authorities of width direction of chain 1.

As Fig. 1, Figure 6 and Figure 7, each chain link 2, have and make roughly that the corner of rectangular plate-shaped member forms the profile of fillet, and on this zip length direction (consistent), have two through holes 4 (first through hole 41 and second through hole 42) side by side with the chain length direction.In a through hole 4, each is inserted and is connected with a fillet 5 and a chain pin 3 respectively.Chain link 2 repeated configuration on the chain width direction is a plurality of, and staggers successively in the chain lengthwise location and to dispose.Stagger in the position that makes the chain length direction and on the chain width direction, in the through hole 4 of the chain link 2 of repeated configuration, connect and insert a chain pin 3, interconnect a plurality of chain links 2 thus, and form endless belt-shaped chain 1.

The end face 3t of chain pin 3 more is positioned at the chain width direction outside than the end face of fillet 5.Should contact with the sheave face of pulley by outstanding chain pin 3.

Figure 15 is the stereogram that expression has chain of the present invention and constitutes as the summary of the chain-type continuously variable transmission 50 of power transmission one mode of execution of the present invention.This chain-type continuously variable transmission 50 such as can be used as the automobile speed changer, and has: as the metallic drive pulley 10 of first pulley; Metallic follow-up pulley 20 as second pulley; Be erected at the endless belt-shaped chain 1 between these pulleys 10,20.Pulley 10,20 is such as being formed by metals such as Bearing Steels.Among Figure 15, for ease of understanding, part shows the chain cross section.

As shown in Figure 1, chain pin 3 and fillet 5 are bar-like members that the cross section slightly is rectangle, but can be wound up into sheathed (to call circumferential skewing etc. in the following text) on the circular pulley in order to ensure chain 1, and the shape of its sectional shape and through hole 4 is considered.A side of chain pin 3 and a lateral parts of the fillet 5 that is adjacent contact, and its contact condition changes along with the circumferential skewing state of chain 1.This way of contact is a kind of rolling sliding contact, the compound contact of promptly roll contact or sliding contact or these two kinds of contacts.In these ways of contact, especially preferred employing is rolled and is contacted.Under this occasion, vibration and noise in the time of can effectively suppressing chain 1 action.Side in the side of the fillet 5 that is preferably in side of chain pin 3 and is adjacent is provided with the projection (convex surface) of chain width direction, and the opposing party then is not provided with the projection of chain width direction, and is flat condition at the chain width direction.

Because chain pin 3 so contacts with fillet 5, thereby when chain pin 3 was clamped by the sheave face of pulley, chain pin 3 generally can not take place around the phenomenon of chain bearing pin center rotation.Therefore frictional loss can be reduced, and higher power transfer efficiency can be guaranteed.

Figure 16 is the sectional view (along the sectional view in the cross section radially of pulley 10,20) of stepless speed variator 50 middle pulleys 10 or 20.As shown in the drawing, the end face 3t of the chain pin 3 of chain 1 and contacts at sheave face 12a, the 13a of the inboard of pulley 10 (20) conical surface-shaped opposite one another (22a, 23a), and transmits tractive force by this contact friction force.

Shown in the side view of the chain 1 of Fig. 2, chain pin 3 is made of following section area different two kinds of chain pin 3f and 3h: the thick chain pin 3f that the section area in the cross section vertical with this chain pin length direction is bigger; And the less thin chain pin 3h of this section area.Thick chain pin 3f is identical in fact with the length of the chain pin length direction of thin chain pin 3h.The length of so-called chain pin length direction is identical in fact, means the length direction length of a plurality of chain pins, be within the margin of error that is produced when making same length with usual method, and be below the 60 μ m such as the difference in length of chain pin length direction.

For thick chain pin 3f and thin chain pin 3h, in each chain pin, each locational sectional shape of chain pin length direction (sectional shape in the cross section vertical in the single chain pin with the chain pin length direction.Hereinafter to be referred as sectional shape.) and the section area (section area in the cross section vertical with the chain pin length direction.Hereinafter to be referred as section area.), roughly the same on the whole length of chain pin length direction.That is, in each chain pin, on the arbitrary position of chain pin length direction, be roughly the same sectional shape, and be roughly the same section area.

As shown in Figure 2, the sectional shape of thick chain pin 3f becomes a kind of shape of having amplified the sectional shape of thin chain pin 3h on the chain length direction.Promptly, under the state that is installed on the chain 1, if the sectional shape of thick chain pin 3f is compared with the sectional shape of thin chain pin 3h, then the two is at the width of chain thickness direction (above-below direction of Fig. 2) much at one, but the width Lf of the chain length direction in thick chain pin 3f cross section is greater than the chain length direction width Lh in thin chain pin 3h cross section.

If the section area of thick chain pin 3f is compared with the section area of thin chain pin 3h, the section area of thick chain pin 3f is 1.1 times～2 times of section area of thin chain pin 3h.

The shape of the through hole 4 of chain link 2, corresponding with the shape of thick chain pin 3f and thin chain pin 3h.That is, thick chain pin 3f therefrom inserts logical thick through hole 4f, therefrom inserts logical thin through hole 4h greater than thin chain pin 3h.In order to make the chain 1 can be at circumferential skewing, make be in the chain link 2 about the shape inequality of two through holes 4, but in this manual, when relating to thick through hole 4f or thin through hole 4h, do not consider aforesaid shape difference, be referred to as thick through hole 4f and thick chain pin 3f is therefrom inserted logical through hole 4, and the therefrom slotting logical through hole 4 of thin chain pin 3h is referred to as thin through hole 4h.

In chain 1, adopt multiple chain link 2.Promptly as shown in Figure 2, chain link 2 comprises: have the long-chain joint 2f of thick through hole 4f and do not have the short chain 2h of thick through hole 4f.In long-chain joint 2f, one in two through holes 4 is thick through hole 4f, and remaining one then is thin through hole 4h.And in short chain 2h, two through holes 4 are thin through hole 4h.

Therefore, long-chain saves the pitch P1 of 2f, just is longer than the pitch P2 of short chain 2h.In addition, corresponding with aforementioned pitch P1, P2, the chain length direction length X of long-chain joint 2f is greater than the chain length direction length Y of short chain 2h.

As above the chain 1 of Gou Chenging has following action effect.

Because thick chain pin 3f is identical in fact with the length of the chain pin length direction of thin chain pin 3h, thereby the 3 concentrated wearing and tearing of specific chain pin can not take place.

Because thick chain pin 3f is different with the section area of thin chain pin 3h, thereby can reduce the sound that produces when chain-type continuously variable transmission 50 moves.Its principle is as follows.

In chain-type continuously variable transmission shown in Figure 15 50, when chain 1 entered into sheave face 12a, 13a, 22a, the 23a of each pulley 10,20, the chain pin 3 of chain 1 just clashed with these sheave faces, and pushes this sheave face.Under its reaction, chain pin 3 just from its end face 3t by sheave face extruding, chain pin 3 just accepts to make the power of the direction that its chain pin length direction length is compressed, and deform (following this distortion is called compressive strain etc.).Resiliently deformable takes place because of this power in chain pin 3, then, deforms and returns to original state (following this distortion is called recovered distortion etc.), but recover in the distortion at this, once more squeezing groove wheel face 12a, 13a, 22a, 23a.Thus, pulley 10,20 just produces vibration, and by this vibration sound takes place.The main cause that sound takes place also has other factors, but be maximum based on the sound of aforementioned principles.

In the chain 1 of present embodiment, comprise the different multiple chain pin 3 of section area on the cross section vertical, promptly thick chain pin 3f and thin chain pin 3h with the chain length direction of chain pin 3.In this thick chain pin 3f and thin chain pin 3h, for aforesaid sound occurring principle, the size and time of power of pushing each sheave face is different.Especially, in thick chain pin 3f and thin chain pin 3h, the mode of aforementioned recovery distortion is different, when this recovers distortion, puts on the size of the power on each sheave face and regularly etc. also different.Therefore, can make the frequency of the sound that takes place by pulley 10,20 obtain disperseing, and can reduce the peak value of sound pressure level of the sound of generation, also can suppress the sympathetic response of pulley 10,20.Thus, the sound that produces in the time of can reducing chain-type continuously variable transmission 50 actions.

For thick chain pin 3f and thin chain pin 3h, in each chain pin, even on the arbitrary position of chain pin length direction, sectional shape and section area are also identical.That is, in single chain pin, even on the arbitrary position of chain pin length direction, sectional shape and section area are also identical.Like this, because shape is simpler, thereby be easy to make.

As mentioned above, under the state in being installed on chain 1, if the sectional shape of thick chain pin 3f is compared with the sectional shape of thin chain pin 3h, the two in the length of chain thickness direction (above-below direction of Fig. 2) much at one, but the chain length direction width Lf of thick chain pin 3f is greater than this width Lh of thin chain pin 3h.

Therefore, the pitch of chain link 2 is corresponding to the sectional shape of this each chain pin 3f, 3h.That is, therefrom insert in the logical chain link 2 at thick chain pin 3f, being provided with bigger through hole 4 corresponding to this thick chain pin 3f is thick through hole 4f, but for corresponding with this thick through hole 4f, needs the long-chain joint 2f that adopts pitch longer.

In the present embodiment, corresponding with different pitch lengths, the chain length direction length of chain link itself is also different.

Like this, owing to adopt the different a plurality of chain links 2 of pitch, and insert the wide more chain pin of width of long more its chain length direction of pitch of logical chain link, thereby can be easy to design chain 1.Promptly, as mentioned above, adopting multiple chain pin to reduce under the occasion of sound of generation, make multiple chain pin by the chain length direction width that only changes chain pin 3 cross sections, and the corresponding therewith pitch that suitably changes each chain link 2, can be easy to design the different chain 1 of chain length direction width in pitch and chain pin 3 cross sections thus.In addition, different according to aforementioned pitch and chain length direction width change the strip length direction length of chain self, thus, such as comparing with the occasion of above-below direction (chain thickness direction) width that changes the chain pin cross section, can be easy to design chain 1.

If the section area of thick chain pin 3f is compared with the section area of thin chain pin 3h, the section area of thick chain pin 3f is 1.1 times～2 times of section area of thin chain pin 3h.If this value is below 1.1 times, then because the difference of the section area of multiple chain pin is less, just thereby aforesaid noise reduction insufficient.And if this value is more than 2 times, then the chain length direction between chain pin and the chain pin at interval (pitch) and the energy of sound is increased just can increase, noise is strengthened.Also have the occasion comprise following chain pin, that is: the too small and chain pin of intensity and rigidity deficiency of section area, and section area is excessive and reduce the chain pin of the design freedom of chain 1.Yet, as present embodiment, owing to be made as 1.1 times～2 times, thereby do not have aforementioned unfavorable condition.From this viewpoint, the section area of thick chain pin 3f, more preferably 1.5 times～2 times of the section area of thin chain pin 3h.

In aforementioned embodiments, comprise two kinds of chain pin 3f, 3h that section area is different, but the chain pin kind is not limited to two kinds certainly, also can be more than three kinds.In addition, also can be that section area is identical and have only the different chain pin of sectional shape.Its reason is, the power of pulley 10,20 that puts on when compressive strain and when recovering distortion etc. under this occasion in the aforementioned sound occurring principle and regularly etc. different.

As mentioned above, section area or sectional shape to chain pin compares respectively in the cross section of each position of chain pin length direction, as long as owing to there is cross section, a place different, thereby, such as also can the contrast chain pin each other, the sectional shape of chain pin and section area much at one, but have only a chain pin to have necking down and recess or protuberance in the part of chain pin length direction on each position of chain pin length direction, thereby have only sectional shape or section area in this part different.Its reason is, under this occasion too, in the aforementioned sound occurring principle, put on the power of pulley 10,20 and regularly etc. different when compressive strain and when recovering distortion etc.

In the present invention, as mentioned above, preferably, the chain link that pitch is long is more inserted the wide more chain pin of width that leads to the chain length direction, the mode of following such as comprising here (first) and (second).

(first) chain pin has these two kinds of the narrower chain pins (to call thin chain pin in the following text) of the chain pin (to call thick chain pin in the following text) of the wider width of chain length direction and this width, chain link comprises following two kinds: an interpolation in two through holes is led to thick chain pin, and leads to the chain link A of thin chain pin in all the other through hole interpolations; In two through holes, all insert the chain link B of logical thin chain pin, under this occasion, make the mode of the pitch of chain link A greater than the pitch of chain link B,

(second) chain pin is divided into thick chain pin and two kinds of thin chain pins, and chain link has following three kinds: the chain link C that all inserts logical thick chain pin in two through hole both sides; The logical thick chain pin of an interpolation in two through holes is then inserted the chain link D of logical thin chain pin in all the other through holes; All insert the chain link E of logical thin chain pin in two through hole both sides, under above-mentioned occasion, the pitch of these chain links has the occasion of the relation of following inequality:

Chain link C＞chain link D＞chain link E.

Know from the illustration of aforementioned (first) and (second), aforementioned what is called " chain link that pitch is long more; insert and lead to chain pin long more on the chain length direction ", mean that " insert the chain pin lead in single chain link, this inserts width summation of chain length direction in the logical part " is big more, use the long more chain link of pitch, thus, can be easy to design chain with multiple chain pin.

In aforementioned embodiments, adopted the different multiple chain pin of section area, but also can adopt the different multiple chain pin of rigidity at the active force of chain length direction.Its reason is, under this occasion also as mentioned above, in aforementioned sound generating principle, act on during compressive strain and when recovering distortion etc. in the pulley 10,20 power and regularly etc. can be different.In order to make aforementioned rigidity different, such as can suitably adopting following method etc.: change the section area and the sectional shape of chain pin, and make rigidity different, perhaps make the material of chain pin different, perhaps make the heat treatment of metallic pin different.

In power transmission chain of the present invention,, be preferably and arrange multiple chain pin brokenly putting in order of multiple chain pin.Its reason is: by aforesaid irregular alignment, can effectively disperse the frequency of the sound that produces, and further reduce sympathetic response.

In order in this irregular alignment, to obtain optimal arrangement, test such as a plurality of chains that can utilize the pattern of rows and columns that has changed chain pin randomly, perhaps simulate, thereby determine the less optimal arrangement of sound of generation by computer.

In aforementioned embodiments, adopted multiple chain link, but also can adopt the chain link of single kind.In order to make chain link become single kind, preferably in all chain pins, make at the chain pin sectional shape of the logical part of chain link interpolation all identical.For this reason, such as adopting each other at all chain pins, the all identical and different multiple chain pin of material of the sectional shape of chain pin and section area, perhaps also can adopt each other, make chain link insert methods such as sectional shape on the chain pin lengthwise location outside the logical part is different mutually at multiple chain pin.At chain link is under the occasion of single kind, can reduce the variety of components of chain, thereby be easy to component management, but also can simplify the assembling of chain, helps to reduce cost.

(based on the check of embodiment's sound pressure level decline effect)

For verifying the sound pressure level decline effect of first invention, carried out checking based on embodiment and comparative example.Fig. 3 is in the power transmission of the chain with comparative example 1, the sound that produces when measuring action, and represented that the plotted curve of the sound pressure level under each frequency of this sound, the chain of this comparative example 1 are that the kind that chain pin length direction length is identical in fact and kind chain pin is a kind of and chain link also is a kind of chain.In the chain of this comparative example 1, the mutual interval (pitch) of each chain pin equates on the whole length of chain.Fig. 4 is the plotted curve that is equipped with under embodiment 1 the occasion of chain, and this embodiment's 1 chain comprises that the length of chain pin length direction is identical in fact, but the different two kinds of chain pins of the chain length direction width of chain pin and two kinds of different chain links of pitch of chain link.This embodiment 1, the aforementioned comparative example 1 that equates with pitch is different, and the mutual distance (pitch) of chain pin is different in the chain.Except the specification of chain pin and chain link, the specification of the power transmission of embodiment 1 power transmission and comparative example 1 is identical.

In embodiment 1, adopt pitch P1 be 8.8mm chain link, and pitch P2 be these two kinds of chain links of chain link of 8.2mm, and adopted chain length direction width Lf be 2.5mm thick chain pin, and chain length direction width Lh be these two kinds of chain pins (with reference to Fig. 2) of thin chain pin of 2.0mm (width Lf 80%).In addition, the chain thickness direction width La (with reference to Fig. 2) of two kinds of chain pins is 6mm.

As shown in Figures 3 and 4, embodiment 1 compares with comparative example 1, and the sound pressure level maximum value has reduced 10dB approximately.

Next, with reference to accompanying drawing the second working of an invention mode among the present invention is described.

The pattern stereogram of the main composition of the chain that the chain-type continuously variable transmission that one mode of execution of second invention relates to is used (following also be called for short " chain ") 100, same with the chain 1 of aforementioned first invention, represent that by Fig. 1 its basic comprising is identical with chain 1.That is, these chain 100 integral body are banded ringwise, and by constituting with lower member: a plurality of metallic chain links 2; Be used to interconnect a plurality of metallic chain pins 3 of these chain links 2; A plurality of fillets 5 that the length of chain pin length direction is slightly shorter than these chain pins 3.Chain link 2 and chain pin 3 are such as being formed by metals such as Bearing Steels.A plurality of fillets 5 are same shape.A plurality of chain pins 3 comprise the chain pin that sectional shape is different, but the length direction identical length of all chain pins 3 together.The end face 3t of chain pin 3 more is in the outside of chain width direction than the end face of fillet 5, and this end face 3t contacts with the sheave face of pulley.That is, in this chain 1, chain pin 3 is transmission chain pins of double as chain friction transmission part.

Fig. 5 is the planimetric map of the chain link 2 of chain 100 in second invention, and the shape of this chain link 2 also chain 1 with aforementioned first invention is identical.As this Fig. 5 and shown in Figure 1, each chain link 2, the corner with slightly rectangular plate-shaped member by rounding profile, and on its chain length direction (consistent), have two through holes 4 side by side with the chain length direction.Therefore, in a through hole 4, insert a logical fillet 5 and a chain pin 3 respectively.Chain link 2 is a plurality of in chain width direction repeated configuration, and the position of the chain length direction that staggers successively disposes.Like this, the position of chain length direction stagger and through hole 4 at the chain link 2 of chain width direction repeated configuration in, connect and insert identical chain pin 3, interconnect a plurality of chain links 2 thus, and form endless belt-shaped chain 100.

As shown in Figure 5, two through holes 4 that chain link 2 is had are by constituting at chain length direction first through hole 41 and second through hole 42 arranged side by side.The shape of first through hole 41 and second through hole 42 is different mutually, and as described later, chain 1 can be to the bending of chain length direction (chain 1 can be wound up into the bending on the circular pulley).In chain 1, with all each chain link 2 in the same manner, first through hole, 41 relative second through holes 42 are positioned at a side of chain length direction.In other words, in each all chain links 2, second through hole, 42 relative first through holes 41 are positioned at the opposite side of chain length direction.

Fig. 6 is illustrated in the figure that inserts the state of one group of chain pin 3 and fillet 5 in these first through holes 41 and second through hole 42 respectively.One group of chain pin 3 and fillet 5 connect in second through hole 42 of first through hole 41 of a chain link 2 and another chain link 2 from a plurality of chain links 2, thus, make at chain link arranged side by side on the chain width direction 2 to connect on the chain length direction each other flexiblely.

As shown in Figure 6, with certain chain link 2 monomer is example, and chain pin 3 is pressed in first through hole 41 and fixes, and the fillet 5 that contacts with this chain pin 3, in predetermined gap is inserted into first through hole 41, thereby be embedded into movably in first through hole 41.On the other hand, in second through hole 42 of this chain link 2, fillet 5 is pressed in second through hole 42 and fixes, and the chain pin 3 that contacts with this fillet 5, in predetermined gap is inserted into second through hole 42, thereby be embedded into movably in second through hole 42.

As shown in Figure 1, the position of chain length direction is different mutually, and constitutes at two chain links 2 of chain width direction adjacency, is provided with: chain pin 3, it is fixed in first through hole 41 of a chain link 2, and is embedded into movably in second through hole 42 of another chain link 2; Fillet 5, it is embedded in first through hole 41 of a chain link 2 movably, and is fixed in second through hole 42 of another chain link 2.Like this, be inserted into the combination of same through hole 4 (first through hole 41 or second through hole 42) interior chain pin 3 and fillet 5, just move relative to the contact of rolling, thus, chain 1 can be to the bending of chain length direction.

Watch from the side of chain 1, these chain pins 3 are involutes of a kind of circle with the track of the contact position of fillet 5.Fig. 7 is that expression chain pin 3 and the rolling contact of fillet 5 limits (are the rolling contact that comprises some sliding contacts strictly speaking.Also claim the rolling sliding contact.) figure of the displacement state that moves of limit, wherein, for first through hole 41, in chain pin 3 and the fillet 5, have only fillet 5 to move (rotation) relative to first through hole 41, and for second through hole 42, in chain pin 3 and the fillet 5, have only chain pin 3 to move (rotation) relative to second through hole 42.When chain 1 when the chain length direction is crooked, this rolling contact just takes place move.Yet chain pin 3 and fillet 5 continue contact in the gamut that the contact of rolling is moved, and therefore, transmission loss can reach inferior limit, thereby can guarantee higher power transfer efficiency.

For in aforementioned chain pin 3 being contacted with the rolling of fillet 5 move, chain pin 3 becomes round involute with the track of the contact position of fillet 5, and need make in the chain pin 3 sectional shape with the surface of contact 3a of fillet 5, become involute curve, and make the surface of contact 5a of a fillet 5 become plane (sectional shape is a straight line) with basis for establishing circle radius R.In addition, also can make among the surface of contact 3a, chain pin 3 and fillet 5 rolls the scope that contact (below be also referred to as working flank) interior sectional shape, become involute curve.

In order to make the chain pin 3 and the track of the contact position of fillet 5 become round involute, can be as described in the present embodiment, make the surface of contact 3a of chain pin 3 become involute shape, and make the surface of contact 5a of fillet 5 become tabular surface, also can be conversely, make the surface of contact 5a of fillet 5 become involute shape, and make the surface of contact 3a of chain pin 3 become tabular surface.In addition, any one that also can make two surface of contact 3a, 5a becomes curved surface, makes aforementioned track become round involute thus, and under this occasion, the sectional shape of each working flank of surface of contact 3a and surface of contact 5a is preferably identical.

Involute among the present invention also comprises the curve (slightly involute) that is similar to involute.Its reason is, even be similar to the curve of involute, and also can be to a certain degree with aforementioned polygon vibration suppression.

Like this, chain 1 just have in the sectional shape of surface of contact 3a (working flank), the different two or more chain pin 3 of basic circle radius of involute.Consequently form following combination: the track of mutual contact position is the combination of different two or more chain pins of the basic circle radius of involute 3 and fillet 5.

The chain friction transmission part is a plurality of chain pins 3, comprises the different multiple chain pin 3 of rigidity at the power of chain width direction.In the present embodiment, different by the section area that makes chain pin 3, make aforementioned rigidity different.That is, different although all chain pins 3 form by same material by the thickness that makes chain pin 3, can make at the rigidity of the power of chain width direction (chain length direction) different.The side view of the chain 100 of curved section and aforementioned chain 1 are not same, and as shown in Figure 2, basic comprising is identical with this chain 1.That is, chain pin 3, thick chain pin 3f and this section area less thin chain pin 3h bigger by the section area in the cross section vertical with this chain pin length direction constitute, and promptly are made of section area different two kinds of chain pin 3f, 3h.Thick chain pin 3f is identical in fact with the chain pin length direction length of thin chain pin 3h.So-called chain pin length direction length is identical in fact, means a plurality of chain pin length direction length, be in the margin of error that is produced when making same length with usual method, and be below the 60 μ m such as the difference of chain pin length direction length.

For thick chain pin 3f and thin chain pin 3h, in each chain pin, each locational sectional shape of chain pin length direction (sectional shape in the cross section vertical in the single chain pin with the chain pin length direction, hereinafter to be referred as sectional shape) and the section area (section area in the cross section vertical with the chain pin length direction, hereinafter to be referred as section area), roughly the same on the whole length of chain pin length direction.That is, in each chain pin, all become roughly the same sectional shape on the arbitrary position of chain pin length direction, and have roughly the same section area.

As shown in Figure 2, the sectional shape of thick chain pin 3f becomes a kind of shape of having amplified the sectional shape of thin chain pin 3h on the chain length direction.Promptly, under the state that is installed on the chain 100, if the sectional shape of thick chain pin 3f is compared with the sectional shape of thin chain pin 3h, then the two is at the width of chain thickness direction (above-below direction of Fig. 2) much at one, but the chain length direction width Lf in thick chain pin 3f cross section is greater than the chain length direction width Lh in thin chain pin 3h cross section.

If the section area of thick chain pin 3f is compared with the section area of thin chain pin 3h, then the section area of thick chain pin 3f 1.01 times～2 times of section area of thin chain pin 3h preferably are more preferably 1.1 times～2 times.

The shape of the through hole 4 of chain link 2, corresponding with the shape of thick chain pin 3f and thin chain pin 3h.That is, thick chain pin 3f therefrom inserts logical thick through hole 4f, therefrom inserts logical thin through hole 4h greater than thin chain pin 3h.As mentioned above, in order to make chain 100 can be on the chain length direction crooked, and make be in the chain link 2 about the i.e. shape inequality of first through hole 41 and second through hole 42 of two through holes 4, but in this manual, when relating to thick through hole 4f or thin through hole 4h, do not consider the difference of first through hole 41 and second through hole 42, be referred to as thick through hole 4f, and the therefrom slotting logical through hole 4 of thin chain pin 3h is referred to as thin through hole 4h and thick chain pin 3f is therefrom inserted logical through hole 4.Thick through hole 4f can be any one of first through hole 41 or second through hole 42, and is same, and thin through hole 4h can be any one of first through hole 41 or second through hole 42.

In chain 100, adopt multiple chain link 2.Promptly as shown in Figure 2, chain link 2 comprises: the long-chain with thick through hole 4f saves 2f, does not have the short chain 2h of thick through hole 4f.In long-chain joint 2f, one in two through holes 4 is thick through hole 4f, and all the other one then is thin through hole 4h.And in short chain 2h, two through holes 4 are thin through hole 4h.

Therefore, long-chain saves the pitch P1 of 2f, is longer than the pitch P2 of short chain 2h.In addition, corresponding with aforementioned pitch P1, P2, long-chain saves the chain length direction length X of 2f, is longer than the chain length direction length Y of short chain 2h.Therefore, different along with each chain link 2f, 2h pitch, also different in the pitch of the logical chain pin 3 of these each chain link interpolations.

Be provided with in chain 100 under the occasion of a plurality of pitches, if meropodium particularly about 1.2 times, can give full play to that then pitch is set as multiple effect apart from about 1.1 times～1.3 times that are short pitch, and meropodium is apart from can not be long, thereby is preferred.Under the occasion of the different multiple chain link 2 of the length that chain link 2 is set (chain length direction length), below 1/4 of quantity of the preferably short chain of the quantity of long-chain joint.Its reason is, if this ratio is too high, just then the long-chain joint can be too much, cause meropodium to increase apart from part, and increases the sound that produces.Yet, if this ratio is little, the different effect of zip length can be reduced, thereby more than 15% of quantity of the preferably short chain of the quantity of long-chain joint.

As mentioned above, for chain pin 3,, can carry out independent assortment to the thickness of this involute shape and chain pin 3 although have the different two or more chain pin 3 of basic circle radius of involute in the sectional shape of surface of contact 3a.Such as, if the basic circle radius of involute is made as these two kinds of R1 and R2, and during R1＞R2, then the basis of the involute in thin chain pin 3h sectional shape circle radius can be made as R1, and this radius of thick chain pin 3f is made as R2, otherwise, also the basis of the involute in thick chain pin 3f sectional shape circle radius can be made as R1, and this radius of thin chain pin 3h is made as R2.

Figure 15 is the stereogram that expression has chain 100 of the present invention and constitutes as the summary of the chain-type continuously variable transmission 50 of a mode of execution of power transmission of the present invention.As described in to the explanation of aforementioned first invention, this chain-type continuously variable transmission 50 such as can be used as the automobile speed changer, and has: as the metallic drive pulley 10 of first pulley; Metallic follow-up pulley 20 as second pulley; Be erected at the endless belt-shaped chain 100 between these pulleys 10,20. Pulley 10,20 is such as being made by metals such as Bearing Steels.Among Figure 15, for ease of understanding, only part shows the cross section of chain 100.

Figure 16 is the pulley 10 of stepless speed variator 50 or 20 sectional view (along the sectional view in the cross section radially of pulley 10,20).As shown in the drawing, the end face 3t of the chain pin 3 in the chain 100 and contacts at sheave face 12a, the 13a of the inboard of pulley 10 (20) conical surface-shaped opposite one another (22a, 23a), and transmits tractive force by this contact friction force.Therefore, chain pin 3 is transmission chain pins of double as chain friction transmission part.

In chain 100, thin chain pin 3h and thick chain pin 3f dispose with irregular order (randomly).Also dispose owing to save 2f, thereby pitch P1 and pitch P2 also dispose with irregular order (randomly) with irregular order for short chain 2h and long-chain.If the basic circle radius of involute is made as these two kinds of R1 and R2, during and R1＞R2, can be that the chain pin 3 of R1 is same then with involute basis circle radius in the sectional shape, dispose the chain pin 3 that radius is R2 with irregular order (randomly).Though be " irregular order ", also needn't be irregular fully on the whole full week of chain 100.

The chain 100 of Gou Chenging has following action effect as described above.

Because chain pin 3 is involutes of circle with the track of the contact position of fillet 5, thereby the polygon vibration is less.

Relevant this point at first describes from the polygon vibration.The summary of the chain pin track when Fig. 8 represents that common chain that watch from the side of chain, in the past is wound up on the pulley.The figure shows when the chain limit enters right edge from the drawing left row and be wound up into the chain pin track of pulley (omitting diagram) when going up that is positioned at the figure right side of face, its transverse axis is represented to begin the position that position engaged is engaging-in POS INT (mm) from chain and pulley.In the front side (right side among the figure) of more leaning on the chain direct of travel than engaging-in position, chain becomes the state that is wound up on the pulley, thereby the chain pin track just becomes the circular shape corresponding with the winding radius of chain 100, and more leaning on a forward side (left side among the figure) of chain direction of advance, up-down vibration like the chain pin track is then wavy than engaging-in position.Polygon that Here it is vibration.The reason of this polygon vibration is, connecting link and form chain, and when the chain length direction is crooked can not become circular-arcly completely, and becomes polygon.Promptly under this occasion, on engaging-in position, the tangent direction of pulley and the approach axis of chain pin be different, and can produce entering angle shown in Figure 8, thereby chain pin limit trailing edge is contacted with pulley.The chain pin slippage of the moment of pulley and chain pin contacts is expressed as initial engaging-in location variation.Chain is produced move up and down, and produce the polygon vibration by the repetition of aforementioned up-down vibration.If aforesaid contact position track becomes round involute, then aforementioned entering angle (with reference to Fig. 8) is just can dwindle, and initial engaging-in location variation can reduce, thereby can suppress the polygon vibration.

Therefore, owing to be formed with the combination of the basic circle radius of involute different two or more chain pin 3 and fillet 5, thereby can suppress the resonance of polygon vibration, thus reduce the sound that produces based on this polygon vibration.

Because thick chain pin 3f is different with the section area of thin chain pin 3h, thereby can reduce the sound that produces when chain-type continuously variable transmission 50 moves.Its principle is as follows.

In chain-type continuously variable transmission shown in Figure 15 50, when chain 100 entered into sheave face 12a, 13a, 22a, the 23a of each pulley 10,20, the chain pin 3 of chain 100 just conflicted with these sheave faces, and pushes this sheave face.Under its reaction, chain pin 3 is from this end face 3t and by sheave face extruding, chain pin 3 is compressed the power of the length of this chain pin length direction, and produces distortion (following this distortion is called compressive strain etc.).Resiliently deformable takes place because of this power in chain pin 3, deforms then and returns to original shape (following this distortion is called recovered distortion etc.), but when this recovers distortion, once more squeezing groove wheel face 12a, 13a, 22a, 23a.(below be also referred to as the sound occurring principle) pulley 10,20 vibrates because this principle, and this vibration will be sounded.

In the chain 100 of present embodiment, comprise the different multiple chain pin 3 of section area in the cross section vertical with the chain pin length direction of chain pin 3, promptly comprise thick chain pin 3f and thin chain pin 3h.In this thick chain pin 3f and thin chain pin 3h, the size and the time of the power of each sheave face of extruding are different in the aforementioned sound occurring principle.Especially, in thick chain pin 3f and thin chain pin 3h, the mode of aforementioned recovery distortion is different, and when this recovers distortion, the size of the power that each sheave face is applied and regularly etc. also different.Thereby the sound frequency that takes place from pulley 10,20 can obtain disperseing, thereby can reduce the peak value of sound pressure level of the sound of generation, and then can suppress the sympathetic response of pulley 10,20.The sound that produces when therefore, chain-type continuously variable transmission 50 moves just reduces.

For thick chain pin 3f and thin chain pin 3h, in each chain pin, even on the arbitrary position of chain pin length direction, sectional shape and section area are also identical.That is, in single chain pin, even on the arbitrary position of chain pin length direction, sectional shape and section area are also identical.Like this, because shape is more simple, thereby be easy to make.

Because thick chain pin 3f is identical in fact with the chain pin length direction length of thin chain pin 3h, thereby wearing and tearing can not take place to concentrate on specific chain pin 3.

As mentioned above, under the state that is installed on chain 100, if the sectional shape of thick chain pin 3f and the sectional shape of thin chain pin 3h are compared, though length much at one for the chain thickness direction of the two (above-below direction of Fig. 2), but the chain length direction width Lf of thick chain pin 3f is longer than this width Lh of thin chain pin 3h.

Therefore, the pitch of chain link 2, corresponding with the sectional shape of this each chain pin 3f, 3h.That is, be connected with in the chain link 2 of thick chain pin 3f inserting, corresponding with this thick chain pin 3f bigger through hole 4 is set is thick through hole 4f, but for corresponding with this thick through hole 4f, and adopt the longer long-chain joint 2f of pitch.

And then corresponding with different pitch lengths in the present embodiment, the chain length direction length of chain link self is also different.

Like this, adopt the different a plurality of chain links 2 of pitch, and the pitch of the inserting logical chain link wide more chain pin of width of reel chain length direction more, thereby be easy to design chain 100.Promptly, adopting multiple chain pin to reduce under the occasion of sound of generation as mentioned above, make multiple chain pin 3 by the chain length direction width that only changes chain pin 3 cross sections, and the corresponding therewith pitch that suitably changes each chain link 2, can be easy to design the different chain 100 of chain length direction width in pitch and chain pin 3 cross sections thus.In addition, different corresponding with aforementioned pitch and chain length direction width changes the strip length direction length of chain self, thus, such as comparing with the occasion of above-below direction (chain thickness direction) width that changes the chain pin cross section, can be easy to design chain 100.

Utilize long-chain joint 2f and short chain 2h and make the pitch of chain link different, and, so the chain length direction pitch of chain pin 3 is also different.Because the chain length direction pitch of chain pin 3 is different, thus chain pin 3 and pulley to contact pitch also different.Thereby the sound frequency that produces because of chain pin 3 and contacting of pulley just can obtain disperseing, thereby can reduce the sound pressure level peak value of the sound of generation.Because following formation, promptly the pitch of chain link is long more then inserts the wide more chain pin 3 of width that leads to the chain length direction, thereby can be easy to when the pitch that makes chain pin 3 is different, make chain pin 3 different at the rigidity of the power of chain width direction, thereby noise reduction is better.

If the section area of thick chain pin 3f is compared with the section area of thin chain pin 3h, the section area of thick chain pin 3f 1.01 times～2 times of section area of thin chain pin 3h preferably then.If this value is below 1.01 times, then because the difference of the section area of multiple chain pin is less, just thereby aforesaid noise reduction insufficient.And if this value is more than 2 times, then the chain length direction between chain pin and the chain pin at interval (pitch) and acoustic energy is increased just can increase, thereby the sound of generation is strengthened.Also have the occasion comprise following chain pin, that is: the too small and chain pin of intensity and rigidity deficiency of section area, and section area is excessive and reduce the chain pin of the design freedom of chain 100.Yet, as present embodiment, by being made as 1.01 times～2 times, and do not have aforementioned disadvantages.From this viewpoint, the section area of thick chain pin 3f preferably is made as 1.5 times～2 times of section area of thin chain pin 3h.

In aforementioned embodiments, the basic circle radius of illustrated is involute is two kinds a occasion, but also can be more than three kinds.Equally, the rigidity of chain pin and pitch also are not limited to the described two kinds of occasions of aforementioned embodiments certainly, also can be more than three kinds.Yet, if kind is too much, just component management cost and manufacture cost can rise.If chain pin rigidity, pitch and involute basis circle radius are respectively two～three kinds, then can obtain sufficient noise reduction, and good with the balance of cost, thereby be preferred.

In order to make chain pin rigidity (at the rigidity of the power of chain width direction) different, can make section area identical and have only sectional shape different, also can make section area and sectional shape all identical, and have only material different.Also can replace and only make material different, and adopt same material, but make heat treatment different.And then, as the alternate manner that is intended to make this rigidity different, such as also adopting following method: each other at the chain pin that compares, the sectional shape of chain pin and section area are all identical on almost each position of chain pin length direction, but have only the part of the chain pin length direction of a chain pin to have necking down and recess, or protuberance etc., thereby only in this part, sectional shape or section area are different.

In order to make chain pin rigidity (at the rigidity of the power of chain width direction) different, can be on the back side 3d (with reference to Fig. 6) at the face opposite of chain pin 3 also with surface of contact 3a, form recesses such as groove, change the chain pin section area of chain pin 3 thus.Under this occasion, also can make a plurality of identical chain pins 3 in advance, and on the 3d of the back side of this chain pin 3, be provided with or be not provided with recess such as groove, and change shape and configuration etc., thereby change chain pin section area and chain pin sectional shape.This occasion has the following advantages: only just can change rigidity, can discern the classification of chain pin 3 easily by groove by simply processing (groove processing etc.), even and process this recess, do not influence the shape of sectional shape and the through hole 4 of surface of contact 3a yet.

In the present invention, as mentioned above, preferably, the chain link that pitch is long is more inserted the wide more chain pin of width that leads to the chain length direction, the situation of following such as comprising here (first) and (second).

(first) chain pin has these two kinds of the narrower chain pins (to call thin chain pin in the following text) of the chain pin (to call thick chain pin in the following text) of the wider width of chain length direction and this width, chain link comprises following two kinds: an interpolation in two through holes is led to thick chain pin, and leads to the chain link A of thin chain pin in all the other through hole interpolations; In two through holes, all insert the chain link B of logical thin chain pin, under this occasion, make the mode of the pitch of chain link A greater than the pitch of chain link B,

(second) chain pin is divided into thick chain pin and two kinds of thin chain pins, and chain link has following three kinds: the chain link C that all inserts logical thick chain pin in two through hole both sides; The logical thick chain pin of an interpolation in two through holes and at the chain link D of the logical thin chain pin of all the other through hole interpolations; All insert the chain link E of logical thin chain pin in two through hole both sides, under above-mentioned occasion, the pitch of these chain links just has the occasion of the relation of following inequality:

Chain link C＞chain link D＞chain link E.

Know from the illustration of aforementioned (first) and (second), aforementioned what is called " chain link that pitch is long more; insert and lead to chain pin long more on the chain length direction ", mean that " insert the chain pin lead in single chain link, this inserts width summation of chain length direction in the logical part " is big more, use the long more chain link of pitch, thus, can be easy to design chain with multiple chain pin.

As mentioned above, although preferably respectively with irregular order (randomly), arrange multiple chain pin rigidity, multiple pitch and multiple involute shape, but in order from this irregular alignment, to obtain optimal arrangement, test such as utilizing a plurality of chains that changed each pattern of rows and columns randomly, perhaps simulate with computer, thus the less optimal arrangement of sound that decision produces.

Generally speaking, the amplitude of polygon vibration and the relation of pitch have the pitch tendency (with reference to Fig. 9) that large amplitude is big more more.Equally, the entering angle shown in Figure 10 and the relation of pitch also have the big more tendency of the big more entering angle of pitch.On the other hand, following tendency is arranged: as shown in figure 11, even increase the basic circle radius of involute, the amplitude of polygon vibration does not increase a lot thereupon yet, and in addition, as shown in figure 12, when increasing the basic circle radius of involute, entering angle reduces.Therefore, when increasing involute basis circle radius with the combination of fillet 5, just can follow pitch to increase and in the defective that causes, multiple involute basis circle radius and pitch are set, thereby are preferred in elimination along with the chain pin 3 that forms the meropodium distance.

In the plotted curve of Figure 11 and Figure 12, so-called turning radius is little, and the winding radius that means chain is the occasion of 31.65mm, and so-called turning radius is big, means that this winding radius is the occasion of 73.859mm.

Preferably, the chain pin 3 that the basic circle radius of involute is more little makes the chain pin rigidity more little.Its reason is, although the tendency that the sound (knocking sound) that has the little chain pin of basic circle radius to produce is easy to increase by reducing the rigidity of the less chain pin of this basis circle radius, can absorb sound (the knocking sound) size that (mitigation) produces.

Below, the optimal way of sectional shape of the surface of contact 3a of the chain pin 3 in the chain 100 of aforementioned embodiments is described.Figure 14 is the figure that is used to illustrate this preferable shape, is the side view of watching chain pin 3 from its end face 3t direction.Among the surface of contact 3a of chain pin 3 be: from chain 100 bent state chain pin 3 down and the Line of contact A of fillet 5 (among Figure 14, represent, below the be also referred to as an A) zone till the Line of contact B (in Figure 14, representing) not with putting with point with fillet 5 working flank that contact that rolls.Therefore, comprise the profile line (profile line) of this working flank, the profile line of surface of contact 3a is made of the convex curve of slyness.

For the involute curve of the working flank on the cross section of chain pin 3, as shown in figure 14, preferably on the tangent line SA at the some A place of chain pin 3 profile lines, the center M of configure base circle radius Rb.Like this, as basic circle radius Rb, the coiling center (not shown among Figure 14) under the state from be wound up into pulley (not shown Figure 14) at chain 100 on of being made as till putting A apart from dA (not shown) time, the polygon vibration just reaches minimum, thereby is preferred.Yet such as using under the occasion of CVT at automobile, owing to winding radius changes in predetermined range, thereby afore-mentioned distance dA also changes.Therefore, under this occasion, if the aforementioned dA with winding radius when maximum is made as dAx, and aforementioned dA hour is made as dAn with winding radius, then preferably, basic circle radius Rb is set at 1/4 (dAn)≤Rb≤2 (dAx), and in this scope, is made as basic circle radius Rb multiple.

(reducing the checking of effect based on embodiment's sound pressure level)

For the sound pressure level of confirming second invention reduces effect, carried out checking based on embodiment and comparative example.Figure 13 is that the sound that under identical conditions when running in the power transmission of embodiment 2 and comparative example 2,3 is produced has carried out measuring and plotted curve relatively.In embodiment 2, adopt and the same formation of the aforementioned second working of an invention mode, and, respectively mix two kinds respectively, and arrange brokenly respectively the basic circle radius of involute, section area and these three projects of chain pin of chain pin 3.In comparative example 3, the sectional shape of chain pin 3 is convex curve (projection) rather than involute, and the rigidity of chain pin and pitch also only adopt a kind of.In addition, comparative example 2 is metal tapes that a kind of automobile that has been useful for is in the past used CVT, and its structure is: connect thin-walled block (コ マ) with steel band, this block disposes the vertical direction of relative strip length direction and overlapping a plurality of in the strip length direction.This comparative example 2 is compared with comparative example 3 this power transmission chains in the past, and the sound of generation is few, but sheathed is relatively poor, so the degrees of freedom of gear ratio is less than comparative example 3 this chain types, and this point is well-known.

To these three examples, measure the sound of generation with four kinds of rotating speeds, and maximum sound pressure level (dBA) is compared with integrated value (dBA) both sides.Its result as shown in figure 13, in the comparison of maximum sound pressure level (dBA), the sound that embodiment 2 produces all is lower than comparative example 3 in all four kinds of rotating speeds.Especially in 1000rpm and 2000rpm, embodiment 2 value all is lower than any one of comparative example 2,3, and the sound that produces is lower than the comparative example 2 of the higher metal band type of quietness.In the comparison of integrated value (dBA), the sound that embodiment 2 produces all is lower than comparative example 2 and comparative example 3 in all rotating speeds.

In aforementioned embodiments, although only illustration chain pin 3 occasion of going back double as chain friction transmission part, also can be provided with and the independently chain friction transmission part of first chain pin that contacts and second chain pin that rolls mutually.Such as, also can constitute: at the chain length direction predetermined distance of being separated by, a plurality of bar-like members that extend at the chain width direction abreast with first chain pin and second chain pin are set, and more to the side-prominent chain friction transmission part (brake pad) of chain width direction two, and two end faces of this chain friction transmission part are contacted with the sheave face of pulley transmit power than these two chain pins.

Structure when below explanation has adopted the aforementioned stepless speed variator 50 of the chain of aforementioned first invention and second invention to be used as speed changer.Drive pulley 10 shown in Figure 15, but one is mounted rotatably on the input shaft 11 that is connected in motor one side, and comprise: the fixed sheave 12 with conical surface-shaped sheave face 12a; Movable sheave 13 with this sheave face 12a arranged opposite with conical surface-shaped sheave face 13a.Like this, by these sheave faces 12a, 13a, from the side to suppress clamping chain 1 (chain 100).On movable sheave 13, be connected with hydraulic transmission (not shown), thus movable sheave 13 can input shaft 11 axially on move.When movable sheave 13 moved, the opposed distance (groove width) of opposed sheave face 12a, 13a just changed.Because it is certain that the chain width of chain 1 (chain 100) keeps, thereby chain 1 (chain 100) just reels in the radial position corresponding to this chain width, and changes the winding radius of chain 1 (chain 100).

On the other hand, to follow-up pulley 20 too, the winding radius of chain 1 (chain 100) is to change with the same principle of drive pulley 10.

Follow-up pulley 20, but one is mounted rotatably on the output shaft 21 that is connected in driving wheel one side, and comprise: the fixed sheave 22 with conical surface-shaped sheave face 22a; Movable sheave 23 with this sheave face 22a arranged opposite with conical surface-shaped sheave face 23a.Like this, by these sheave faces 22a, 23a, from the side to suppress clamping chain 1 (chain 100).In addition, on movable sheave 23, be connected with hydraulic transmission (not shown), thus movable sheave 23 can output shaft 21 axially on move.When movable sheave 23 moved, the opposed distance (groove width) of opposed sheave face 22a, 23a just changed.Because it is certain that the chain width of chain 1 (chain 100) keeps, thereby chain just reels in the radial position corresponding to this chain width, and changes the winding radius of chain.

In speed change is under the occasion of bottom gear state more, by moving of movable sheave 13, amplify the groove width of drive pulley 10 sides, thereby reduce the winding radius of chain 1 (chain 100) on drive pulley 10, and, by moving of movable sheave 23, dwindle the groove width of follow-up pulley 20 sides, thereby enlarge the winding radius of chain 1 (chain 100) on follow-up pulley 20.

Otherwise, in speed change is under the occasion of top gear state more, by moving of movable sheave 13, dwindle the groove width of drive pulley 10 sides, thereby amplify the winding radius of chain 1 (chain 100) on drive pulley 10, and, by moving of movable sheave 23, amplify the groove width of follow-up pulley 20 sides, thereby dwindle the winding radius of chain 1 (chain 100) on follow-up pulley 20.Bring into play stepless shift function thus.

Chain of the present invention, in aforementioned chain-type continuously variable transmission 50 this power transmissions, the sound pressure level of the sound that produces in the time of can reducing its action.

In aforementioned first invention and the second working of an invention mode, first through hole 41 and second through hole 42 of chain link 2 are not communicated with (with reference to Fig. 5) mutually, but as Figure 17 and shown in Figure 180, in the present invention's (first invention and second invention), first through hole 41 and second through hole 42 also can interconnect.In Figure 17 and variation shown in Figure 180, first through hole 41 is configured to the interconnecting part R that second through hole 42 is connected: will cut apart the segmentation 60 (with reference to Fig. 5 etc.) of first through hole 41 and second through hole 42, transversal on the zip length direction.

The interconnecting part R that first through hole 41 is connected by setting with second through hole 42, can be easy to the distortion of chain link 2, and under the occasion that is subjected to from chain pin 3 and fillet 5 more energetically, the stress that can relax on the through hole peripheral portion is concentrated, thereby improves the durability of chain link.In chain link chimeric fixing (based on be pressed into, shrink fit, cold pressing and cooperate etc. chimeric fixing) being pressed in the chain of chain pin and fillet, this stress concentrates alleviation effects especially big.

In these variation, interconnecting part R is set at the substantial middle position of two through holes 41,42 at the chain link width direction.In variation shown in Figure 17, the width of interconnecting part R is narrower, and in variation shown in Figure 180, the wider width of interconnecting part R.If dwindle the width of interconnecting part R, then compare with the occasion of the wider width of interconnecting part R, the rigidity of chain link can be improved, and the distortion of this chain link when suppressing to make chain link can be suppressed at by punch process.If enlarge the width of interconnecting part R, then compare with the narrower occasion of the width of interconnecting part R, can be easier to the distortion of chain link 2, thereby the alleviation effects that stress is concentrated is bigger.Also can suitably determine the width of this interconnecting part R according to chain link size and loading condiction etc.

As shown in Figure 7, because each through hole 41,42, have the guide function (with reference to Fig. 7) that leads is moved in the rolling contact of chain pin 3 and fillet 5, thereby, dispose interconnecting part R in the mode of not damaging aforementioned guide function making under first through hole 41 and the occasion that second through hole 42 is connected.For keeping this guide function, preferably avoid the surface of contact (being included in whole parts that aforementioned rolling contacts contact when mobile) of chain pin 3 and fillet 5 and each through hole 41,42 inner peripheral surface, interconnecting part R is set.Yet,, also can further amplify the width of interconnecting part R, thereby form the chain link that does not have part with aforementioned guide function being independent of under the occasion of guide element that chain link setting has aforementioned guide function.

Claims (3)

1. power transmission chain, have a plurality of chain links and a plurality of chain pins that interconnect these a plurality of chain links, this power transmission chain is erected at first pulley with conical surface-shaped sheave face and has between second pulley of conical surface-shaped sheave face and uses, and the both ends of the surface of aforementioned chain pin contact with the sheave face of aforementioned first and second pulley and transmit power, and this power transmission chain is characterised in that:

Aforementioned a plurality of chain pin separately, each locational sectional shape of chain pin length direction and section area are roughly the same on the whole length of this chain pin in single chain pin, and

Aforementioned a plurality of chain pin comprises multiple chain pin, the length that this multiple chain pin is the chain pin length direction is identical in fact, this multiple chain pin is by making in its cross section chain thickness direction width identical and chain length direction width is different, thereby make different with the corresponding rigidity of the power that acts on the chain pin length direction, and, aforementioned a plurality of chain link comprises the different multiple chain link of its pitch, and

In the long more chain link of aforementioned pitch, insert the wide more chain pin of width that is connected with aforementioned chain length direction.

2. power transmission chain according to claim 1, it is characterized in that: in the different aforementioned multiple chain pin of aforementioned section area, this section area of the chain pin of aforementioned section area maximum is 1.1 times～2 times of this section area of the chain pin of aforementioned section area minimum.

3. a power transmission comprises: first pulley with conical surface-shaped sheave face; Second pulley with conical surface-shaped sheave face; Be erected at the power transmission chain between these first and second pulleys, this power transmission is characterised in that:

Aforementioned power transmission chain is claim 1 or 2 any described power transmission chains.

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