JP2005140225A - Power transmission chain and power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the vibration and noise and to improve the silence in a power transmission chain 3 and a power transmission device. <P>SOLUTION: In this power transmission chain 3 wrapped around pulleys 1, 2 and formed by endlessly connecting a plurality of links 10 by pins 11, at least an outer part of the link 10 positioned at an outermost side in the radial direction among the links 10 is formed of a damping member 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a power transmission chain used by being wound around a pulley in a configuration in which each of a plurality of links is connected endlessly with a pin, and a power transmission device using the power transmission chain.

For example, in a continuously variable transmission (CVT) used for vehicles such as automobiles, for example, a drive pulley provided on the engine side and a driven pulley provided on the drive wheel side are bridged between the two. Some have an endless power transmission chain. In the power transmission chain, a plurality of links are connected to each other by pins and strips (see, for example, Patent Document 1).
JP-A-8-312725

  In the above-mentioned conventional example, the noise generated with the movement of the chain is suppressed, but the noise caused by the collision or vibration when the power transmission chain is wound around the pulley is, for example, an in-vehicle continuously variable transmission that requires quietness. When applied to a machine, it can be a noise.

  The present invention is a power transmission chain in which each of a plurality of links is connected endlessly with a pin, and is characterized in that a damping member is provided on the surface of the link.

  According to the present invention, the vibration and sound generated by the rotation operation of the power transmission chain are attenuated by the damping member, so that the generation of noise can be reduced.

  In the above case, when a through-hole penetrating in the width direction is provided in each of the plurality of links, and a pin is provided in each through-hole so that both ends of the pin go out of the through-hole, Among the links, it is preferable to provide at least the outermost link in the width direction because the vibration and sound are more effectively attenuated by the damping member.

  Of the plurality of links, the link itself located on the outermost side in the width direction can be formed of a damping material.

  Four or more links are arranged in the width direction, and the link located at the outermost side in the width direction is formed of a vibration damping material, and the link made of this vibration damping material is attached in a state not subjected to a tensile load or a compression load. Is preferred.

  When the power transmission chain of the present invention is used as an endless power transmission chain that is wound around two pulleys each having a V-shaped circumferential groove, vibrations and sounds generated by the rotation operation of the power transmission chain are attenuated and noise is reduced. It is preferable that the generation of the above can be reduced.

  The present invention can attenuate the vibration and sound generated by the rotational operation of the power transmission chain, so that the quietness during operation can be improved.

  1 is a perspective view schematically showing a continuously variable transmission as a power transmission device, FIG. 2 is a perspective view showing a part of the power transmission chain of FIG. 1, and FIG. 3 is a diagram of the power transmission chain of FIG. FIG. 4 is a plan view, FIG. 4 is a sectional view taken along line (4)-(4) in FIG. 3, and FIG. 5 is a side view showing a part of the power transmission chain in FIG.

  The continuously variable transmission of the illustrated example has a configuration in which an endless power transmission chain (hereinafter simply referred to as a chain) 3 is wound around a drive pulley 1 and a driven pulley 2.

  The drive pulley 1 is attached to the input shaft 4 connected to the engine side, and the driven pulley 2 is attached to the output shaft 5 connected to the drive wheel side.

  Both pulleys 1 and 2 are composed of fixed sheaves 1a and 2a and movable sheaves 1b and 2b. The fixed sheave 1 a of the drive pulley 1 is fixed to the input shaft 4, and the fixed sheave 2 a of the driven pulley 2 is fixed to the output shaft 5. The movable pulley 1b of the drive pulley 1 is attached to the input shaft 4, and the movable pulley 2b of the driven pulley 2 is attached to the output shaft 5 so as to be integrally rotatable and axially movable.

  The fixed sheaves 1a and 2a and the movable sheaves 1b and 2b each have a conical surface, and a V-shaped circumferential groove is formed between the conical surfaces of the fixed sheaves 1a and 2a and the conical surfaces of the movable sheaves 1b and 2b. Has been. The movable sheaves 1b and 2b are moved steplessly in the axial direction by a driving means such as a hydraulic actuator (not shown), for example, so that the groove width in the circumferential grooves of both pulleys 1 and 2 is changed steplessly. Stage shifts are performed.

  The chain 3 is composed of a combination of three links 10A, 10B, and 10C in which one set is sequentially shifted by a predetermined distance in the longitudinal direction of the chain, and each set has links at the same shifted position (reference numerals 10A and 10B). , 10C) each having a first, second, and third link set. Each link 10A, 10B, 10C in each link set is provided with first and second through holes 10a, 10b. The first through hole 10a is on one end side of each link 10A, 10B, 10C on the opposite side to the chain traveling direction, and the second through hole 10b is on each link 10A, 10B, on the chain traveling direction side. It is formed on the other end side of each 10C. The links 10A, 10B, and 10C in each set are connected to each other by pins 11 and strips 12 inserted or press-fitted into the through holes 10a and 10b, respectively. These through-holes 10a and 10b can be combined with one hole.

  Each pin 11 is connected to each link 10A, 10B, 10C so as to be partially surrounded by the wall surface of the first through hole 10a of the link 10A, 10B, 10C, and each strip 12 is connected to the second link 10A, 10B, 10C. It is connected to each of the links 10A, 10B, and 10C so as to be partially surrounded by the peripheral surface of the through hole 10b. Each pin 11 and the strip 12 are connected to the links 10A, 10B, and 10C by press-fitting. The strip 12 is slightly shorter than the pin 11, so that only the outer end surface of the pin 11 can make frictional contact with the pulleys 1 and 2. The outer end surface of the pin 11 has a convex shape so that the pulling force of the chain can be transmitted to the pulleys 1 and 2 by a frictional force.

  The shapes of the first and second through holes 10a and 10b are as shown in FIG. That is, the portion 10a1 of the wall surface of the first through hole 10a is where the pin 11 is press-fitted, and is very close to the outline of the pin 11 or only slightly smaller. The remaining portion 10 a 2 of the wall surface of the first through hole 10 a is configured such that the strip 12 that cooperates in contact with the pin 11 can move freely with respect to the pin 11. As a result, the strip 12 can roll on the pin 11 in the first through hole 10a.

  A portion 10b1 of the wall surface of the second through hole 10b is where the strip 12 is press-fitted, and is very close to the outline of the strip 12, or only slightly smaller. The remaining portion 10 b 2 of the wall surface of the second through hole 10 b is configured such that the pin 11 that cooperates in contact with the strip 12 can move freely with respect to the strip 12.

  Here, on the page of FIG. 5, in one link set, the front side is the first link 10A, the middle side is the second link 10B, and the back side is the third link 10C. The first through hole 10a of the first link 10A is located on the same straight line as the second through hole 10b (indicated by a broken line) of the second link 10B. The first through hole 10a of the second link 10B is located on the same straight line as the second through hole 10b (indicated by a broken line) of the third link 10C. The links 10A, 10B, and 10C are connected to each other in the longitudinal direction of the chain by pins 11 and strips 12 that are passed through the through holes 10a and 10b.

  The chain having the above configuration changes in the position of the tangent line between the pin 11 and the strip 12 as it proceeds in the pulley direction (the right direction in FIG. 5). The tensile force K in the chain is transmitted from one link to another link at the position of the tangent, and is generated on the first link 10A where the couple F = K · X enters. Here, X is the distance between the couples F. When entering the chain, the pin 11 in the first through hole 10a coupled to the first link 10A is not yet in contact with the pulleys 1 and 2, so that the first link 10A is Freely around the tangent line between the strip 12 in the second through-hole 10b coupled to the first link 10A and the pin 11 of the upstream link (not shown) that is in contact with the pulleys 1 and 2 at this time. Can rotate. The couple F acting on the first link 10A that is approaching the entry rotates the first link 10A a little, thereby causing a pin in the second through hole 10b of the second link 10B. 11 is moved up.

  When the pin 11 in the second through-hole 10b of the second link 10B is sufficiently moved up, the string vibration movement of the chain is caused as described in the specification of JP-A-8-31725. It will be suppressed. Since further details of this inhibitory action are described in detail in the publication, description thereof will be omitted.

  In this way, the links 11 are connected to each other by press-fitting or inserting the pins 11 and the strips 12 into the through holes 10a and 10b, and both ends of the pins 11 and the strips 12 are connected to each other as described above. The pin 11 protrudes from the through holes 10a and 10b, and the pin 11 is formed longer than the strip 12, and the outer ends thereof are in contact with the conical surfaces of the drive pulley 1 and the driven pulley 2. . A strip 12 is disposed on the front side of the chain 3 in the traveling direction, and a pin 11 is disposed on the rear side.

  In the continuously variable transmission having such a configuration, in consideration of the fact that the pin 11 collides and generates vibration and sound when the chain 3 is wound around the drive pulley 1 and the driven pulley 2 during operation, as follows. I will explain it because it has been devised.

  The vibration damping member 20 is attached to the outer surface of each link 10 of the chain 3 so as to cover it. This vibration damping member 20 is made by bonding a resin-based, rubber-based, asphalt-based, or metal-based viscoelastic material vibration-damping material to a base material. Alloy, Ni-Ti alloy, Fe-Al alloy and the like. Mn—Cu-based alloys are excellent not only in vibration damping properties but also in formability, workability, nonmagnetic properties, and the like. Fe-Al alloys are excellent in high-temperature vibration damping properties. Examples of the resin-based damping material include fluorine-based, silicon-based, urethane-based, ester-based, and amide-based materials, and can be attached by any method such as welding, adhesion, or thermal spraying.

  As described above, if the damping member 20 is attached to the chain 3, vibration generated by the collision between the pin 11 and the two pulleys 1 and 2 accompanying the operation of the chain 3 is propagated to the link 10 or the sound is air. Propagating inside is attenuated by the damping member 20, and the generation of noise can be suppressed. Therefore, the quietness of the continuously variable transmission is improved.

  By the way, as shown in FIG. 6, the vibration damping member 20 may be attached only to the outer surface of the link 10. Moreover, you may adhere the damping member 20 to the whole surface or outer surface of the link 10 located in the outermost side of the width direction.

  Furthermore, the link 10 located on the outermost side in the width direction can be formed of a damping material. In this case, it is preferable that the link 10 made of the vibration damping material is connected to another link 10 so that a tensile load or a compressive load is not applied. This is because the vibration damping effect by the damping material may be lost in a situation where a tensile load or a compressive load is applied. Moreover, since the vibration damping material has a lower strength than the structural steel material, it is for preventing damage due to a heavy load. By the way, in order to connect the link 10 made of this damping material so that no tensile load or compressive load is applied, the pin 11 and the strip 12 are loosely inserted into the through holes 10a and 10b of the link 10, and these pins are connected. It is conceivable to prevent the 11 and the strip 12 from coming off the link 10 by caulking or the like.

  The continuously variable transmission may have a fixed width so that only the groove width in one of the circumferential grooves of the drive pulley 1 and the driven pulley 2 can be changed, and the other cannot be changed. The present invention can also be applied to a transmission that changes the groove width in the circumferential groove stepwise and a fixed (non-shifting) power transmission device.

  In the above description, a pin type in which both ends of the pin 11 are brought into contact with the conical surfaces of the drive pulley 1 and the driven pulley 2 as the chain 3 is taken as an example. For example, as shown in Japanese Patent Laid-Open No. 1-176832, The present invention can be applied to a block type chain in which a block attached to the pin 11 is brought into contact with each conical surface of the drive pulley 1 or the driven pulley 2.

The perspective view which shows typically the continuously variable transmission which concerns on one Embodiment of this invention. The perspective view which shows a part of chain of FIG. Plan view of the chain of FIG. Arrow view of section of line (4)-(4) in FIG. Side view showing part of the chain of FIG. FIG. 4 is a diagram corresponding to FIG. 4 in another embodiment of the present invention.

Explanation of symbols

1 Drive pulley 2 Driven pulley 3 Chain 4 Input shaft 5 Output shaft 10 Link 11 Pin 12 Strip 20 Damping member

Claims (5)

  A power transmission chain in which each of a plurality of links is connected endlessly with a pin, and a vibration damping member is provided on the surface of the link.   Each of the plurality of links has a through-hole penetrating in the width direction, and each of the through-holes is provided with a pin so that both ends of the pin come out of the through-hole. The power transmission chain according to claim 1, wherein the power transmission chain is provided on an outermost link at least in the width direction.   3. The power transmission chain according to claim 1, wherein, among the plurality of links, a link located on the outermost side in the width direction is formed of a damping material.   Four or more links are arranged in the width direction, and at least the outermost link in the width direction is formed of a vibration damping material, and the link made of the vibration damping material is attached in a state where it is not subjected to a tensile load or a compression load. The power transmission chain according to claim 1, wherein: A power transmission device comprising two pulleys each having a V-shaped circumferential groove, and an endless power transmission chain wound around both pulleys,
5. A power transmission device using the power transmission chain according to claim 1 as the power transmission chain.

Images