JP2020008123A - guide - Google Patents

Abstract

To reduce a chain noise.SOLUTION: A chain guide 9 is provided at a non-stage transmission 1 having a variator 2 in which a chain 5 is wound around a pair of pulleys (a primary pulley 3 and a secondary pulley 4) and inhibits vibration of the chain 5. The chain guide 9 has: a guide rail 92 disposed along a longitudinal direction of the chain 5 at one side of the chain 5 as seen in a thickness direction; and a guide rail 93 disposed along the longitudinal direction of the chain 5 at the other side of the chain 5 in the thickness direction. Protruding parts 921, 931 protruding to the chain 5 side are provided on facing surfaces 920, 930 of the guide rail 92 and the guide rail 93.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a guide that suppresses run-out of an endless member wound around a pair of pulleys.

  Patent Literature 1 discloses a chain guide for suppressing run-out of a chain (endless member) wound around a pair of pulleys.

German Patent Application Publication No. 10 2012 220 746

  The variator of the belt-type continuously variable transmission has a chain wound around a pair of pulleys. In the continuously variable transmission, a desired gear ratio is realized by changing the winding radius of the chain on each pulley.

In a belt-type continuously variable transmission, a chain guide is provided in a region (a region not wound around the pulley) located between a pair of pulleys in the chain.
The chain guide has a guide rail arranged along the chain. The guide rails are arranged on one side and the other side in the thickness direction of the chain, and the chain is located between the pair of guide rails.

  In the chain guide, chain noise is suppressed by suppressing string vibration of the chain with a pair of guide rails. However, it is required that the chain noise can be further suppressed.

The present invention
A guide that is provided in a continuously variable transmission having a variator in which an endless member is wound around a pair of pulleys, and suppresses run-out of the endless member,
The chain guide is
A first guide rail disposed on one side in the thickness direction of the endless member along a longitudinal direction of the endless member;
On the other side in the thickness direction of the endless member, a second guide rail arranged along the longitudinal direction on the endless member,
A guide, wherein at least one of opposing surfaces of the first guide rail and the second guide rail is provided with a protrusion protruding toward the endless member.

As a result of diligent studies of the cause of the noise, the present inventor has found that the third-order string vibration of the endless member in the region between the first guide rail and the second guide rail greatly affects the noise.
Then, by providing a protruding portion to partially reduce the distance between the first guide rail and the second guide rail, the third order of the endless member in the region between the first guide rail and the second guide rail is provided. It has been found that string vibration can be suppressed, thereby reducing noise.

It is a figure explaining the circumference of the variator of a chain type continuously variable transmission. It is a figure explaining arrangement of a chain guide in a variator. It is a figure explaining a chain guide. It is a figure explaining a chain guide. It is a figure explaining string vibration of a chain in an existing chain guide. It is a figure explaining a chain guide. It is a figure explaining an effect of a chain guide. It is a figure explaining a chain guide concerning a modification.

Hereinafter, an embodiment of the present invention will be described by taking a case where the embodiment is applied to a chain-type continuously variable transmission 1 as an example.
FIG. 1 is a diagram illustrating the periphery of a variator 2 of a chain-type continuously variable transmission 1.

  As shown in FIG. 1, a variator 2 of a chain-type continuously variable transmission 1 for a vehicle includes a pair of pulleys (a primary pulley 3 and a secondary pulley 4) and an endless chain 5 wound around the pair of pulleys. (Endless member).

The primary pulley 3 has a fixed pulley 31 and a movable pulley 32.
The fixed pulley 31 has a shaft portion 311 arranged along the rotation axis X1 and a sheave portion 312 extending radially outward from the outer periphery of the shaft portion 311.

The movable pulley 32 has an annular base 321 externally inserted into the shaft 311 of the fixed pulley 31, and a sheave 322 extending radially outward from the outer periphery of the annular base 321.
The sheave portion 312 of the fixed pulley 31 and the sheave portion 322 of the movable pulley 32 have sheave surfaces 312a and 322a inclined at a predetermined angle with respect to the rotation axis X1.

  In the primary pulley 3, a V groove 33 around which the chain 5 is wound is formed between a sheave surface 312 a of the fixed pulley 31 and a sheave surface 322 a of the movable pulley 32.

  In the primary pulley 3, by adjusting the supply pressure to the oil chamber R1 attached to the movable pulley 32, the movable pulley 32 is displaced in the direction of the rotation axis X1. Thereby, the groove width of the V groove 33 between the sheave surfaces 312a and 322a is changed according to the supply pressure, and the winding radius of the chain 5 on the primary pulley 3 is changed.

The secondary pulley 4 has a fixed pulley 41 and a movable pulley 42.
The fixed pulley 41 has a shaft portion 411 arranged along the rotation axis X2, and a sheave portion 412 extending radially outward from the outer periphery of the shaft portion 411.

The movable pulley 42 has an annular base 421 externally inserted into the shaft 411 of the fixed pulley 41, and a sheave 422 extending radially outward from the outer periphery of the annular base 421.
The sheave portion 412 of the fixed pulley 41 and the sheave portion 422 of the movable pulley 42 have sheave surfaces 412a and 422a inclined at a predetermined angle with respect to the rotation axis X2.

  In the secondary pulley 4, a V groove 43 around which the chain 5 is wound is formed between the sheave surface 412 a of the fixed pulley 41 and the sheave surface 422 a of the movable pulley 42.

  In the secondary pulley 4, by adjusting the supply pressure to the oil chamber R2 attached to the movable pulley 42, the movable pulley 42 is displaced in the direction of the rotation axis X2. Thereby, the groove width of the V groove 43 between the sheave surfaces 412a and 422a is changed according to the supply pressure, and the winding radius of the chain 5 on the secondary pulley 4 is changed.

FIG. 2 is a diagram illustrating the arrangement of the chain guides 9 (9A, 9B) in the variator 2, and schematically shows a state in which the entire variator 2 is viewed from the directions of the rotation axes X1 and X2 in FIG. .
In FIG. 2, for convenience of explanation, one chain guide 9A is shown in a cross-section, and the other chain guide 9B is shown in a side view. Further, the chain 5 is simply indicated.

As shown in FIG. 2, in the continuously variable transmission 1, the chain 5 is wound around the primary pulley 3 and the secondary pulley 4, and the chain 5 is formed with V grooves 33, 43 () of the primary pulley 3 and the secondary pulley 4. (See FIG. 1).
Therefore, when the continuously variable transmission 1 is driven, movement such as bending or vibration occurs in a region (a region where the chain is not wound) between the primary pulley 3 and the secondary pulley 4 in the chain 5.
In particular, the region between the gripping point of the primary pulley 3 in the chain 5 and the gripping point of the secondary pulley 4 in the chain 5 vibrates in a string with the two gripping points as fulcrums.

  The continuously variable transmission 1 has a chain guide 9 (9A, 9B) for restricting the movement of the chain 5. The chain guide 9 (9A, 9B) is provided in a region of the chain 5 that is not wound around the outer periphery of the primary pulley 3 and the secondary pulley 4.

The chain guides 9A and 9B are provided in a symmetrical position with respect to a line Lm connecting the rotation axis X1 of the primary pulley 3 and the rotation axis X2 of the secondary pulley 4.
The chain guide 9A and the chain guide 9B are respectively provided on the upper side and the lower side in the vertical direction based on the mounting state of the continuously variable transmission 1 on the vehicle.

As shown in FIG. 1, the chain guide 9 </ b> A is swingably supported by a chain guide supporting member 7 </ b> A (see FIGS. 1 and 2) that is arranged across the transmission case 10 and the side cover 15. I have.
The chain guide 9B is also swingably supported by a chain guide support member 7B (see FIG. 2) disposed over the transmission case 10 and the side cover 15.

As shown in FIG. 2, the chain guide support members 7 (7A, 7B) are provided inside the chain 5 in a direction along the rotation axes X1, X2 when viewed from the directions of the rotation axes X1, X2.
The chain guide support members 7 (7A, 7B) are also provided in a symmetrical positional relationship with respect to the line Lm.

  The region where the chain guides 9A and 9B are provided in the chain 5 is a region where the chain 5 is arranged along tangent lines L1 and L2 that straddle the primary pulley 3 and the secondary pulley 4. The chain guide support members 7A and 7B are provided on the line segment Lm side with respect to the tangent lines L1 and L2.

  The chain guides 9A and 9B have the same shape. In the following, when these chain guides 9A and 9B are not distinguished, they are simply referred to as chain guides 9. The chain guide support members 7A and 7B also have the same basic shape. Therefore, in the following, when these chain guide support members 7A and 7B are not distinguished, they are simply referred to as chain guide support members 7.

FIG. 3 is a perspective view illustrating the chain guide 9.
FIG. 4 is a diagram illustrating the chain guide 9. FIG. 4A is a perspective view showing the chain guide 9 divided into two guide members 91, 91 constituting the chain guide 9. FIG. 4B is a plan view of one of the guide members 91 constituting the chain guide 9 when viewed from the other guide member 91 side. FIG. 4C is a sectional view taken along the line AA in FIG.

As shown in FIGS. 3 and 4, the chain guide 9 is formed by assembling guide members 91 having the same shape in the width direction of the chain 5.
As shown in FIGS. 4B and 4C, the guide member 91 includes a guide rail 92 disposed on one side of the chain 5 in the thickness direction, a guide rail 93 disposed on the other side, and a chain 5. And a connection portion 94 that connects the guide rails 92 and 93 to each other. The guide rails 92 and 93 and the connecting portion 94 are integrally formed from the same material.

The guide rails 92 and 93 are plate-like members arranged along the longitudinal direction of the chain 5, and the connecting portion 94 connects central portions of the guide rails 92 and 93 in the longitudinal direction (see FIG. 4). (B)).
In the guide rail 92, a pair of engaging arms 95, 95 that engage with the chain guide support member 7 are provided at positions overlapping the connecting portion 94 in the longitudinal direction of the guide rail 92. The engagement arms 95, 95 are also formed integrally with the guide rail 92, and the chain guide 9 is swingably attached to the chain guide support member 7 via the engagement arms 95, 95.

As described above, the chain guide 9 is configured by assembling the pair of guide members 91, 91.
As shown in FIG. 4B, in the guide rail 92, an engagement piece 925, an engagement hole 926, an engagement rod 927, and an engagement hole 928 are provided at a portion facing the guide member 91 on the other side. And are provided.

  The engagement pieces 925 and the locking holes 928 are provided in a symmetrical relationship with respect to a line (center line Cx) passing through the center of the guide rail 92 in the longitudinal direction (the left-right direction in the drawing). The engagement hole 926 and the engagement rod 927 are also provided in a symmetrical positional relationship with respect to the center line Cx.

Similarly, on the guide rail 93, an engagement piece 935, an engagement hole 936, an engagement rod 937, and an engagement hole 938 are provided at a portion facing the guide member 91 on the other side.
The engagement pieces 935 and the locking holes 938 are provided in a symmetrical relationship with respect to a line (center line Cx) passing through the center of the guide rail 93 in the longitudinal direction (the left-right direction in the drawing). The engagement hole 936 and the engagement rod 937 are also provided in a symmetrical positional relationship with respect to the center line Cx.

Therefore, when the pair of guide members 91 and 91 are assembled, the engagement pieces 925 and the engagement rods 927 engage with the engagement holes 928 and the engagement holes 926 of the guide member 91 on the other side, respectively. The guide rails 92 of the guide members 91 are inseparably joined.
Further, the engagement piece 935 and the engagement rod 937 engage with the engagement hole 938 and the engagement hole 936 of the guide member 91 on the other side, respectively, so that the guide rails 93, 93 of the pair of guide members 91, 91 are provided. Are inseparably joined (see FIG. 4A).

In the chain guide 9 formed by assembling the guide members 91, 91, the chain 5 is disposed between the pair of guide rails 92, 92 and the pair of guide rails 93, 93 (see FIG. 4C).
As shown in FIG. 4B, the surfaces 920 and 930 of the guide rails 92 and 93 facing the chain 5 have flat end surfaces along imaginary lines La and Lb parallel to each other.

The opposing surfaces 920 and 930 of the guide rails 92 and 93 oppose each other at an interval Wa in the thickness direction of the chain 5.
When the rotational driving force is transmitted by the variator 2, the chain 5 passes between the guide rails 92 and 93 from one side in the longitudinal direction to the other side.

FIG. 5 is a diagram illustrating an existing chain guide 8.
As described above, the chain guide is provided to suppress the string vibration generated in the chain 5 when the rotational driving force is transmitted. This is because if the string vibration of the chain 5 is transmitted to the gripping point of the primary pulley 3 in the chain 5 and the gripping point of the secondary pulley 4 in the chain 5, noise increases.

The inventor of the present invention investigated an existing chain guide 8 (see FIG. 5) in which the opposing surfaces 920 and 930 of the guide rails 92 and 93 were flat over the entire length in the longitudinal direction as a part of a study on noise measures. It has been found that there are wear marks on the opposing surfaces 920 and 930 of the guide rail 92 and the guide rail 93.
As for the wear marks, contact marks are confirmed in the regions intersecting the longitudinal center line Cx on the opposing surfaces 920 and 930 of the guide rails 92 and 93 and the regions intersecting the virtual lines Cx1 and Cx2 on both sides of the region. Was. The virtual line Cx1 and the virtual line Cx2 have the same distance from the center line Cx and are symmetrical with respect to the center line Cx.

Therefore, we conducted experiments and simulations and analyzed the causes of wear marks.
(A) The wear mark is generated by the third string vibration of the chain 5; (b) The chain guide 9 can suppress the first string vibration and the second string vibration, We found that we could not sufficiently suppress the next string vibration.

  Here, the first-order string vibration means a period in which the vibration cycle of the chain 5 is long, and for example, the antinode of the amplitude of the chain 5 is located in one region between the guide rail 92 and the guide rail 93. The secondary string vibration means that the vibration cycle of the chain 5 is shorter than the primary string vibration. For example, there are two antinodes of the amplitude of the chain 5 in the region between the guide rails 92 and 93. Means The third-order string vibration means that the vibration period of the chain 5 is shorter than the second-order string vibration. For example, there are three antinodes of the amplitude of the chain 5 in a region between the guide rail 92 and the guide rail 93. Means

  In the first-order string vibration, the chain 5 largely shakes, so that the existing chain guide 8 can suppress the string vibration. In the second-order string vibration, although the swinging occurs at a shorter cycle than the first-order string vibration, the string vibration can be suppressed to some extent by the existing chain guide 8. In the tertiary string vibration, the number of waves (antinodes) is large and swings in a shorter cycle than in the secondary string vibration. There are many opportunities.

As shown in FIG. 5, as a result of the simulation, the region where the wear mark occurs in the existing chain guide 8 substantially coincides with the antinode of the vibration in the combined waveform obtained by combining the first to third string vibrations. It was confirmed.
FIG. 5 indicates that the chain 5 vibrates within the range of the string vibration width indicated by the composite waveform.

  In view of the above points, the existing chain guide 8 cannot suppress the third-order string vibration, and the vibration caused by the collision between the chain 5 and the chain guide 8 causes the vibration caused by the gripping point of the primary pulley 3 in the chain 5 It has been found that the noise is transmitted to the holding point of the secondary pulley 4 in the chain 5 to increase the noise.

Here, when the interval Wa between the guide rails 92 and 93 is reduced, the third-order string vibration can be suppressed.
However, if the distance Wa between the guide rails 92 and 93 is reduced over the entire length in the longitudinal direction, the following points may be concerned.
(A) The friction caused by the contact between the chain 5 and the guide rails 92 and 93 increases, and the torque transmission efficiency between the pulleys decreases.
(B) The contact between the chain 5 and the guide rails 92 and 93 is frequently repeated, so that the guide rails 92 and 93 are more worn.

In view of this, the present inventor has adopted a configuration in which the interval Wa between the guide rails 92 and 93 is not narrowed over the entire length in the longitudinal direction but is partially narrowed, so that the third-order string vibration can be suppressed and noise can be reduced. We found that it could be reduced.
Specifically, at least one of the opposing surface 920 of the guide rail 92 opposing the chain 5 and the opposing surface 930 of the guide rail 93 is provided with a protruding portion projecting toward the chain 5 so that the guide rail 92 , 93 are narrowed in some places.

The inventor of the present invention has studied various aspects of the position and number of the protruding portions.
FIG. 6 is a diagram illustrating the chain guide 9 according to the present embodiment. In FIG. 6, the guide rails 92 and 93 are simply shown. In FIG. 6, the projections 921 and 931 are hatched to clarify the projections 921 and 931 on the guide rails 92 and 93.

As shown in FIG. 6, in the chain guide 9, one protrusion 921 is provided on a guide rail 92 located on one side in the thickness direction of the belt, and two protrusions 921 are provided on a guide rail 93 located on the other side. A protrusion 931 is provided.
Note that the guide rail 92 is located inside the chain 5 arranged annularly with reference to the installation state of the chain 5 in the continuously variable transmission 1. The guide rail 93 is located outside.

In the guide rail 92, a protruding portion 921 is provided at a central portion of the guide rail 92 in the longitudinal direction (the left-right direction in the drawing).
The protruding portion 921 is provided so as to cross the center line Cx from one side in the longitudinal direction to the other side, and has a predetermined width W1 in the longitudinal direction.

  The protrusion 921 is provided such that the center in the longitudinal direction of the protrusion 921 coincides with the center line Cx. The protruding portion 921 is provided at a predetermined height h1 from a surface 920 of the guide rail 92 facing the guide rail 93. In the chain guide 9, the distance Wa between the guide rails 92 is reduced to the distance Wa '(= Wa-h1) at the portion where the protrusion 921 is provided.

In the guide rail 93, protruding portions 931 and 931 are provided on one side (the left side in the figure) and the other side (the right side in the figure) of the center line Cx in the longitudinal direction (the horizontal direction in the figure) of the guide rail 93. Have been.
The protruding portions 931 and 931 are provided so as to cross target virtual lines Cx1 and Cx2 from one side in the longitudinal direction to the other side with the center line Cx interposed therebetween, and are provided with a predetermined width W2 in the longitudinal direction.

  The protruding portions 931 and 931 are provided such that the centers of the protruding portions 931 in the longitudinal direction coincide with the virtual lines Cx1 and Cx2. The protruding portion 931 is provided at a predetermined height h1 from a surface 930 of the guide rail 93 facing the guide rail 92. In the chain guide 9, the distance Wa between the guide rails 92 is reduced to the distance Wa '(= Wa-h1) at the portion where the protrusions 931 and 931 are provided.

  The protruding portions 931 and 931 on the guide rail 93 side are provided with an interval (predetermined distance Lx) between the protruding portions 931 and the protruding portion 921 on the guide rail 92 side. And the projection 931 are provided alternately.

Here, the following points in the chain guide 9 are the optimum values that can suppress the third-order string vibration in consideration of the cycle T when the chain 5 vibrates and the result of the simulation of the string vibration of the chain 5. Is set.
(A) Separation distance Lt between imaginary lines Cx1 and Cx2 defining the positions of protrusions 931 and 931 on guide rail 93 side and center line Cx.
(B) The width W1 of the protrusion 921 on the guide rail 92 side and the width W2 of the protrusion 931 on the guide rail 93 side.
(C) The height h1 of the protrusion 921 on the guide rail 92 side and the protrusion 931 on the guide rail 93 side.

FIG. 7 is a diagram illustrating the effect of the chain guide 9 according to the present embodiment. FIG. 7A compares the radiated sound when the existing chain guide 8 is employed and the radiated sound when the chain guide 9 according to the present embodiment and the chain guides 9α and 9β according to the modified examples are employed. FIG. FIG. 7B is a diagram comparing vibration when the existing chain guide 8 is employed and vibration when the chain guide 9 according to the present embodiment is employed.
In FIGS. 7A and 7B, the primary, secondary, and tertiary strings are used to clarify which frequency band is the primary, secondary, and tertiary string vibrations. The frequency band (frequency range) corresponding to the vibration is indicated by hatching and identifiers “primary”, “secondary” and “tertiary”.
FIG. 8 is a diagram illustrating chain guides 9α and 9β according to a modification.

Tests were performed on the chain guide 9 according to the present embodiment and the existing chain guide 8, and radiation noise and vibration were confirmed.
As a result, as shown in FIGS. 7A and 7B, in both the radiated sound and the vibration, the chain guide 9 according to the present embodiment can obtain better results than the existing chain guide 8. Was done. The chain guide 9 is effective not only for third-order string vibration but also for first- and second-order string vibration.

  This is because the space Wa between the guide rail 92 and the guide rail 93 is partially narrowed, so that the string vibration of the chain 5 when passing between the guide rail 92 and the guide rail 93 is reduced. This is due to suppression by the narrowed portion.

  For this reason, the results of the tests show that the radiated sound and vibration of the chain guide 9α shown in FIG. 8A and the chain guide 9β shown in FIG. It could be confirmed (see FIG. 7).

Here, in the chain guide 9α, projecting portions 921B, 921B, 931B, 931B are provided at one end and the other end in the longitudinal direction of the guide rails 92, 93, respectively.
The protruding portions 921B, 921B on the guide rail 92 side and the protruding portions 931B, 931B on the guide rail 93 side are provided to face each other with the chain 5 interposed therebetween.

In the chain guide 9β, protruding portions 921C and 931C are provided at central portions in the longitudinal direction of the guide rails 92 and 93, respectively.
The protruding portion 921C on the guide rail 92 side and the protruding portion 931C on the guide rail 93 side are provided in a positional relationship facing each other with the chain 5 interposed therebetween.

  As described above, by employing a configuration in which the interval Wa between the guide rails 92 and 93 is not narrowed over the entire length in the longitudinal direction but is partially narrowed, tertiary string vibration can be suppressed and noise can be reduced. Can provide chain guide.

In particular, since the protrusions 921 and 931 are arranged on one side and the other side in the thickness direction of the chain 5, deflection (string vibration) in the thickness direction of the chain 5 can be appropriately suppressed.
When the projections are disposed on both sides in the width direction of the chain, the deflection (string vibration) of the chain cannot be appropriately suppressed, but the occurrence of such a situation can be suitably prevented.

The chain guide 9 according to the present embodiment has the following configuration.
(1) The chain guide 9 is provided in the continuously variable transmission 1 having the variator 2 in which the chain 5 (endless member) is wound around a pair of pulleys (the primary pulley 3 and the secondary pulley 4), and the chain 5 swings. Suppress.
The chain guide 9
A guide rail 92 (first guide rail) disposed on one side in the thickness direction of the chain 5 along the longitudinal direction of the chain 5;
On the other side in the thickness direction of the chain 5, a guide rail 93 (second guide rail) is arranged along the longitudinal direction of the chain 5.
At least one of the opposing surfaces 920 and 930 of the guide rail 92 and the guide rail 93 is provided with protrusions 921 and 931 protruding toward the chain 5.

With this configuration, the distance Wa between the guide rail 92 and the guide rail 93 is partially reduced in a region where the protrusions 921 and 931 are provided.
The string vibration of the chain in the region between the guide rail 92 and the guide rail 93 can be suppressed in the portion where the interval Wa is narrowed.

Here, FIG. 7B shows a comparison result between the existing chain guide 8 and the above-described chain guides 9, 9α, 9β in a chain vibration test. In FIG. 7B, regions exhibiting primary, secondary, and tertiary vibrations are arranged in order from a lower frequency to a higher frequency.
As is clear from FIG. 7B, the degree of reduction of the vibration from the existing chain guide 8 is larger in the secondary vibration than in the primary vibration and in the tertiary vibration than in the secondary vibration. Become.
In the chain guides 9, 9α, and 9β, the degree of reduction in vibration from the existing chain guide 8 increases from the first order to the third order. In particular, in the region of third-order string vibration, the degree of vibration reduction of the chain guide 9 becomes the largest compared to the other chain guides 9α and 9β.

Similarly, FIG. 7A shows a comparison result between the existing chain guide 8 and the above-described chain guides 9, 9α, 9β in the radiation sound of the chain.
As described above, in the chain guides 9, 9α, and 9β, the degree of reduction in the string vibration of the chain increases from the first to the third order as compared with the existing chain guide 8. Along with this, the degree of reduction of the sound radiated from the existing chain guide 8 also increases from the first order to the third order (see FIG. 7A).
As shown in FIG. 7A, in the chain guides 9, 9α, and 9β, the degree of reduction of the sound radiation from the existing chain guide 8 increases from the first order to the third order. In particular, in the region of the third-order string vibration, the degree of reduction of the radiated sound of the chain guide 9 is the largest compared to the other chain guides 9α and 9β.

As described above, in the chain guides 9, 9α, and 9β, the string vibration of the chain can be suppressed in the portion where the interval Wa between the guide rail 92 and the guide rail 93 is narrowed. In all the chain guides 9, 9α, 9β, the effect of suppressing the primary, secondary, and tertiary string vibrations and radiated sound was exhibited. It was confirmed that the best effect was exhibited.
As described above, the chain guide 9 can appropriately reduce noise (chain noise) and vibration caused by touching the chain 5.

The chain guide 9 according to the present embodiment has the following configuration.
(2) Projecting portions 921 and 931 are provided on the guide rail 92 and the guide rail 93, respectively.
The protrusions 921 on the guide rail 92 side and the protrusions 931 on the guide rail 93 side are provided alternately in a direction along the longitudinal direction of the chain 5 (longitudinal direction of the guide rails 92 and 93).

With this configuration, the protrusion 921 located inside (one side) in the thickness direction of the chain 5 and the protrusion 931 located outside (the other side) in the thickness direction of the chain 5 are aligned in the longitudinal direction of the chain 5. Are arranged alternately.
As a result, the inward and outward deflections in the thickness direction of the chain 5 can be appropriately suppressed by the protruding portions 921 and 931, so that the primary, secondary, and tertiary string vibrations of the chain 5 can be more appropriately performed. By suppressing the vibration, the vibration and the radiated sound caused by the string vibration of the chain 5 can be suppressed.
In addition, “inside” and “outside” are based on the case where the chain 5 wound around a pair of pulleys (the primary pulley 3 and the secondary pulley 4) and arranged annularly is viewed from the directions of the rotation axes X1 and X2. And the area surrounded by the annular chain 5 is “inside”.

The chain guide 9 according to the present embodiment has the following configuration.
(3) The protruding portion 921 on the guide rail 92 side is provided at the center of the direction along the longitudinal direction of the chain 5 (the longitudinal direction of the guide rail 92).
The protruding portion 931 on the guide rail 93 side is located at a predetermined distance Lx on one side from the protruding portion 921 on the guide rail 92 side along the longitudinal direction of the chain 5 (longitudinal direction of the guide rail 93), and on the other side. Are provided at positions separated by a predetermined distance Lx.

The chain 5 vibrates between the guide rail 92 and the guide rail 93 at a constant cycle.
With the above configuration, the positional relationship between the protrusions 921, 931 and 931 is provided such that the protrusions 921, 931 and 931 face the antinodes of the amplitude of the string 5 that vibrates in a string. , First, second and third string vibrations can be suppressed. In particular, the chain guide 9 can appropriately suppress the third-order string vibration.
The string vibration of the chain 5, which is a source of noise of the chain 5 (chain noise), is mechanically suppressed by the protruding portion, so that the guide rail 92 and the guide rail 93 can be connected to each other without greatly causing the chain 5 to vibrate. The space can be passed substantially linearly.

The chain guide 9 according to the present embodiment has the following configuration.
(4) The heights h1 of the protrusions 921 and 931 from the opposing surfaces 920 and 930 are the same, and the protrusions 921 and 931 are provided uniformly.

With this configuration, the projections 921 and 931 are uniformly provided at the same height h1, thereby preventing the chain 5 from passing between the guide rails 92 and 93 in an inclined state. it can.
Thereby, uneven wear of the guide rails 92 and 93 can be suitably prevented, and a decrease in the durability of the chain guide 9 due to uneven wear can be suitably prevented.

The chain guides 9α and 9β according to the present embodiment have the following configurations.
(5) Both the guide rail 92 and the guide rail 93 are provided with protrusions 921B and 921C and protrusions 931B and 931C.
The protrusions 921B and 921C on the guide rail 92 side and the protrusions 931B and 931C on the guide rail 93 side are provided at positions facing each other with the chain 5 interposed therebetween.

This configuration also suppresses three-dimensional string vibration of the chain in the region between the guide rails 92 and 93 at the portion where the distance Wa between the guide rails 92 and 93 is narrowed. it can.
As is clear from the description of FIGS. 7A and 7B described above, the chain guides 9α and 9β also reduce the primary, secondary, and tertiary string vibrations of the chain 5 from the existing chain guide 8. Can also be suppressed.
As a result, the use of the chain guides 9α and 9β can also reduce noise (chain noise) and vibration caused by touching the chain 5.

Reference Signs List 1 continuously variable transmission 2 variator 3 primary pulley 4 secondary pulley 5 chain 7 (7A, 7B) chain guide support member 8 existing chain guide 9 (9A, 9B, 9α, 9β) chain guide 91 guide member 92, 93 guide rail 920, 930 Opposing surface 921, 921B, 921C, 931, 931B, 931C Projection 925, 935 Engagement piece 926, 936 Engagement hole 927, 937 Engagement rod 928, 938 Engagement hole 94 Connection part 95 Engagement arm Cx Center line Cx1 Virtual line Cx2 Virtual line L1, L2 Tangent line Lm Line segment La, Lb Virtual line Lx Predetermined distance Lt Separation distance

Claims (5)

A guide that is provided in a continuously variable transmission having a variator in which an endless member is wound around a pair of pulleys, and suppresses run-out of the endless member,
The guide is
A first guide rail disposed on one side in the thickness direction of the endless member along a longitudinal direction of the endless member;
On the other side in the thickness direction of the endless member, a second guide rail disposed along the longitudinal direction of the endless member,
A guide, wherein at least one of opposing surfaces of the first guide rail and the second guide rail is provided with a protrusion protruding toward the endless member. The protrusion is provided on the first guide rail and the second guide rail,
The guide according to claim 1, wherein the protrusions on the first guide rail side and the protrusions on the second guide rail side are provided alternately in the longitudinal direction. The projection on the first guide rail side is provided at a central portion in the longitudinal direction,
The projection on the second guide rail side is provided at a position separated by a predetermined distance on one side of the projection on the first guide rail side and at a position separated by the predetermined distance on the other side in the longitudinal direction. The guide according to claim 2, characterized in that: The protrusion is provided on the first guide rail and the second guide rail,
The said protrusion part on the said 1st guide rail side and the said protrusion part on the said 2nd guide rail side are provided in the position which opposes on both sides of the said endless member, The claim of Claim 1 characterized by the above-mentioned. guide.   The guide according to any one of claims 2 to 4, wherein the height of each of the protrusions from the facing surface is the same.