JP2005140224A - Power transmission chain and power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the silence by making the operation noise be hardly propagated to an outer peripheral side of a power transmission chain 3 in the 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, its outer peripheral part is covered by a sound insulation member 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a power transmission chain (hereinafter referred to as a chain) in which a plurality of links are connected endlessly with pins, and a power transmission device using the same.

For example, in a continuously variable transmission (CVT) used in 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 chain. The chain connects each of a plurality of links with pins and strips (see, for example, Patent Document 1).
JP-A-8-312725

  In the above conventional example, noise generated with the rotation of the chain is effectively suppressed, but it is desirable to further improve quietness in order to make driving of a vehicle equipped with CVT more comfortable. Conventionally, measures have been taken to reduce the noise of a chain transmission, such as covering the entire transmission with a sound insulation wall (cover) or covering the entire chain with a sound insulation wall. Therefore, it is difficult to mount on a small car due to size restrictions. In addition, since the cost of the means such as improving the airtightness of the driver's seat, using a special mount for vibration isolation, or using the above-mentioned sound insulation wall is high, it is more difficult than the cost constraints for small cars that are required to be provided at low cost. It is. Therefore, there is a need for a more effective noise reduction means that is small in size and low in cost.

  The present invention is a chain formed by connecting each of a plurality of links endlessly with a pin, and the outer peripheral portion is covered with a sound insulating member.

  The outer peripheral portion of the chain is a portion exposed to the outside of the endless chain.

  In this case, since the outer peripheral portion of the chain is covered with the sound insulating member, the operation sound generated along with the rotational operation of the chain is hardly transmitted to the outer peripheral side of the chain, and the generation of noise is suppressed.

  A plurality of the sound insulation members are arranged side by side in the longitudinal direction, and can be supported by the pins or links.

  The sound insulation member may be composed of an endless flat belt that covers an outer peripheral portion.

  The present invention is a power transmission device including two pulleys each having a V-shaped circumferential groove and a chain wound around both pulleys, wherein the chain is used as the chain. . In this case, the operation sound generated when the chain rotates is hardly transmitted to the outer periphery side of the chain, and the generation of noise is suppressed.

  The present invention can improve quietness during operation.

  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 chain of FIG. 1, and FIG. 3 is a plan view of the chain of FIG. 4 is a sectional view taken along the line (4)-(4) in FIG. 3, and FIG. 5 is a side view showing a part of the chain in FIG.

  The continuously variable transmission of the illustrated example has a configuration in which an endless 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 1a of the drive pulley 1 is fixed to the input shaft 4 and the fixed sheave 2a of the driven pulley 2 is fixed to the output shaft 5. The movable pulley 1b of the drive pulley 1 is fixed to the input shaft 4 and driven. The movable pulley 2b of the 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 3 having the above configuration changes in the position of the tangent line between the pin 11 and the strip 12 as it advances in the pulley direction (the right direction in FIG. 5). The tensile force K in the chain 3 is transmitted from one link to another link at the position of this tangent, and is generated on the first link 10A through which 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, a hitting sound and a sliding sound between the link 10 of the chain 3 and the pin 11 are generated with the rotation operation of the pulleys 1 and 2. Further, when the chain 3 is wound around the drive pulley 1 or the driven pulley 2, a sound is generated due to contact between the pin 11 and the conical surfaces of the pulleys 1 and 2. Considering these points, the following measures are taken and will be described.

  The outer periphery of the chain 3 is covered with a sound insulation member 20. A plurality of sound insulation members 20 are arranged side by side in the longitudinal direction of the chain 3, so that the plurality of sound insulation members 20 do not interfere with each other and do not interfere with each link 10 of the chain 3. It has become.

  Specifically, the sound insulating member 20 is formed in a U shape by providing two bent portions 22 at both ends in the longitudinal direction of the rectangular body portion 21, and the two bent portions 22 are provided with two through holes 23. ing.

  The sound insulation member 20 is supported by the pin 11 and the strip 12 in a state of straddling the width direction of the chain 3 and in a non-contact state with a portion exposed to the outside of each link 10. That is, the body portion 21 of the sound insulating member 20 is arranged in a state of floating on the outside of the chain 3, each end of the pin 11 and the strip 12 is inserted into each through hole 23 of one bent portion 22, and the other bent portion 22. The other end of each of the pin 11 and the strip 12 is inserted into each through hole 23. The sound insulating member 20 can be formed of an appropriate metal material in addition to a resin material such as a fluororesin or a silicon resin.

  In the conventional chain, the operation sound generated by the operation of the chain 3 is released to the outside. However, as described above, if the outer peripheral portion of the chain 3 is covered with the plurality of sound insulation members 20, each sound insulation member 20 is provided. As a result, the operation sound generated along with the operation of the chain 3 becomes difficult to propagate to the outer peripheral side of the chain 3, and the generation of noise can be suppressed. Therefore, the quietness of the continuously variable transmission is improved.

  As shown in FIG. 6, the sound insulating member 20 may be an endless flat belt and may be attached so as to cover the outer peripheral portion of the chain 3. In this case, the sound insulating member 20 may be adhered to a portion exposed to the outside of each link 10 of the chain 3 or may be simply covered on the outer peripheral portion of the chain 3 in a non-adhered state. The sound insulating member 20 is preferably a flexible material, and can be formed of an appropriate metal material in addition to a resin material such as a fluororesin or a silicon resin, for example.

  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

DESCRIPTION OF SYMBOLS 1 Drive pulley 2 Driven pulley 3 Chain 4 Input shaft 5 Output shaft 10 Link 11 Pin 12 Strip 20 Sound insulation member

Claims (4)

  A power transmission chain formed by connecting a plurality of links endlessly with pins, wherein the outer peripheral portion is covered with a sound insulation member.   The power transmission chain according to claim 1, wherein a plurality of the sound insulation members are arranged in the longitudinal direction and are supported by the pins or links.   2. The power transmission chain according to claim 1, wherein the sound insulating member is an endless flat belt that covers an outer peripheral portion. 3. A power transmission device comprising two pulleys each having a V-shaped circumferential groove, and an endless power transmission chain wound around both pulleys,
A power transmission device using the power transmission chain according to any one of claims 1 to 3 as the power transmission chain.

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