JP2007107635A - Power transmission chain and power transmission device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission chain capable of enhancing durability by preventing a large load from being exerted on a link of an end. <P>SOLUTION: The device takes a first, second and third link trains A, B, C as one group, and successively includes plural sets of the link trains A, B, C. Respective link trains A, B, C have a plurality of links 11, 12, 13 disposed in a chain width direction. The first link train A is arranged with respective links 12b, 13b of the other link trains B, C in between on a one-by-one basis between two links 11a, 11b adjoining each other in the chain width direction in the link train A. The second and third link trains B, C are also arranged with respective links of the other link trains in between on an one-by-one basis between two links adjoining each other in respective ends thereof. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power transmission chain used in a chain type continuously variable transmission or the like employed in a vehicle or the like, and a power transmission device using the power transmission chain.

As a continuously variable transmission of an automobile, for example, a drive pulley provided on the engine side, a driven pulley provided on the drive wheel side, and an endless power transmission chain (hereinafter referred to as an endless power transmission chain) spanned between the two pulleys. Some of them are simply called chains. This chain has a plurality of link rows having a plurality of links, and a plurality of pin members for connecting these link rows to each other.
This chain type continuously variable transmission (CVT) generates traction when the conical sheave surface of each pulley and the end surface of the pin member of the power transmission chain make a slight sliding contact in the circumferential direction of the sheave surface. Power is transmitted by this traction. Then, by continuously changing the groove width of at least one of the drive pulley and the driven pulley, a continuously variable transmission can be performed with a smooth movement different from the conventional gear type (for example, Patent Document 1). reference).

JP-A-2-195045

FIG. 9 shows a general link arrangement pattern for a conventional power transmission chain used in such a continuously variable transmission. This chain includes a plurality of first, second, and third three types of link rows A, B, and C, and each link row A, B, and C has a plurality of links 50, 51, 52. In the first link row A, the links that the other second and third link rows B and C have between the link 50a at the end in the chain width direction and the link 50b adjacent thereto are respectively provided. There are a total of three pieces 51b, 52a and 52b.
In the chain used in the continuously variable transmission, power is transmitted by bringing both end surfaces of the pin member 53 penetrating the link row and connecting the links into contact with the sheave surfaces of the pulleys. ing. Therefore, a larger load acts on the link 50a existing at the end portion in the chain width direction near the end surface of the pin member 53 serving as the power transmission target surface than the link existing at the center portion. Further, there are three links 51b, 52a, 52b between the link 50a at the end of the first link row A in the chain width direction and the link 50b adjacent thereto, and the links 50a, 50b Since the distance is wide, there is a problem that the load acting on the link 50a at the end is further increased. In particular, since such a chain is used under the influence of a large load, there is a problem that durability is lowered in the conventional configuration.

  The present invention has been made in view of the above problems, and a power transmission chain that can alleviate a large load being applied to an end link and improve durability, and a power transmission using the same. The object is to provide a device.

In order to achieve the above object, the power transmission chain of the present invention comprises a plurality of sets of first, second and third link rows as a set, each of which is arranged in the chain width direction. In the power transmission chain in which the link rows adjacent to each other in the chain traveling direction are connected using a pin member, and the end surface of the pin member contacts the power transmission target surface, each of the one set of link rows Are arranged between two adjacent links at the end in the chain width direction in one link row, with each of the links in the other two link rows sandwiched one by one.
According to this, in one link row, the two links adjacent to each other at the end in the chain width direction are arranged with each link of the other two link rows sandwiched one by one, for a total of 2 There are sheets. Further, all of the first, second, and third link strings are arranged in this arrangement. Therefore, since there are only two links in the other two link rows between two links adjacent to each other in the chain width direction of one link row, the interval between the links is reduced. can do. Thereby, even if a big load acts on the link row | line | column of an edge part, it can relieve | moderate that a big load is loaded to the link of the end part. Thereby, durability can be improved.

Further, in the power transmission chain, each of the one set of link rows is between each of the other two link rows between two adjacent links other than the central portion in the chain width direction in one link row. It is preferable to have an array part that sandwiches the links one by one.
According to this, the interval between the two links other than the central portion can be narrowed, and the interval between the two links can be made as uniform as possible in one link row. Therefore, the load acting on the link row can be equalized in the link row.

  In the power transmission chain, each of the first, second, and third link rows preferably has the links arranged symmetrically with respect to the center line in the chain width direction. Thereby, the load which acts on a chain can be equalized as a whole. Further, by arranging the links in line symmetry, it is possible to suppress the generation of moment caused by the configuration of the power transmission chain.

The power transmission device according to the present invention includes a first pulley having a conical sheave surface, a second pulley having a conical sheave surface, and a bridge between the first and second pulleys. A power transmission device including the power transmission chain, wherein the power transmission chain is the power transmission chain.
In this case, according to the power transmission chain described above, the durability of the chain can be improved, so that it is possible to provide a power transmission device that can stably transmit power over a long period of time.

  According to the present invention, the distance between links at the end in the chain width direction can be narrowed, and even when a large load is applied to the end of the link row, it is possible to alleviate that a large load is applied to the endmost link. Thereby, durability can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a main configuration of a power transmission chain for a chain type continuously variable transmission (hereinafter also simply referred to as “chain”) according to an embodiment of the power transmission chain of the present invention. The chain 1 according to this embodiment includes a set of three types of link rows, a first link row A, a second link row B, and a third link row C, along the chain traveling direction (arrow G). As a plurality of sets, the link rows are connected by a pin member to be endless. In addition, the chain 1 has the link row | line about the number of the multiple of 3 on the whole. 2 to 6 are a front view, a right side view, a left side view, a plan view, and a bottom view of the chain 1, respectively. The rear view of the chain 1 is the same as the front view of FIG.

  Each of the first to third link rows A, B, C has a plurality of links 11, 12, 13 arranged in the chain width direction. And the link row | line | column adjacent to a chain advancing direction is connected using the pin member. Specifically, the first link row A and the second link row B are connected by a pin member P1, and the second link row B and the third link row C are different pin members P2. The next first link row A is further connected to the third link row C by another pin member P3, and the same applies to the link rows A, B, and C in the same manner. These link rows A, B, and C are continuously connected. The chain width direction and the chain traveling direction are directions orthogonal to each other. The chain width direction is the same as the longitudinal direction of the pin member.

  The pin member connects link rows adjacent to each other in the chain traveling direction, and links links arranged in the chain width direction in the same link row. The pin member is composed of a pair of a pin (first pin) 14 and a strip (second pin) 15. Both the pin 14 and the strip 15 are made of a rod-like body and are made of metal such as bearing steel. The strip 15 is slightly shorter than the pin 14 in the longitudinal direction of the pin. Then, the end surface 16 of the first pin 14 of the pin member comes into contact with the sheave surface (power transmission target surface) of the pulleys 2 and 3 (see FIG. 8), so that the chain 1 transmits power by frictional force. I do.

  Each of the links 11, 12, and 13 included in each of the link rows A, B, and C is a substantially rectangular plate member having a gentle outline (outline), and these are all substantially substantial. Are formed to have the same outer shape. Moreover, all the links 11, 12, and 13 are made into the same thickness, and are made from metal, such as bearing steel. In FIG. 2, each of the links 11, 12, and 13 is provided with a first through hole 17 and a second through hole 18 separated by a predetermined distance in the link longitudinal direction. In each of the links 11, 12, and 13, a first through hole 17 is formed in the front part in the chain traveling direction (arrow G direction), and a second through hole 18 is formed in the rear part. The first through hole 17 and the second through hole 18 are different in shape from each other, and the pair of pins 14 and the strip 15 are inserted into any of the through holes 17 and 18. The pair of pins 3 and the strip 5 includes a first through hole 17 of a link included in one link row and a second through hole 18 of a link included in another link row. It penetrates.

  As shown in FIG. 2, when the first link row A and the second link row B adjacent in the chain traveling direction are viewed, the second link row B has the second link row B. The pin 14 that is press-fitted and fixed in the two through-holes 18 and rotatably fitted in the first through-hole (not shown) of the link 11 in the first link row A, and the second link row B The strip 15 is loosely fitted in the second through hole 18 of the link 12 and is press-fitted and fixed in the first through hole (not shown) of the link 11 in the first link row A. The link row A and the second link row B are connected. Then, the pair of the pin 14 and the strip 15 inserted in the same through hole (the first through hole 17 or the second through hole 18) relatively rolls in contact with the first link row A. The (link 11) and the second link row B (link 12) are connected so as to be bendable.

  FIG. 7 is a plan view schematically showing the arrangement of a plurality of links included in the chain 1 of the present invention, and corresponds to FIG. In this figure, the pin member is omitted, and the position of the pin member is indicated by a two-dot chain line. In the chain 1 of the present invention, the second link row B has an odd number of links 12, and the first link row A is disposed so as to be displaced from the rear and the front in the chain traveling direction of the second link row. And the third link row C has an even number of links 11 and 13, respectively. In the chain 1 of the embodiment shown in FIG. 7, the first link row A has eight links 11 (11a to 11h), and the second link row B has nine links 12 (12a). To 12i), and the third link row C has eight links 13 (13a to 13h). In FIG. 7, the link 11 is shown as a cross hatch, the link 12 is shown as a single hatch (with a wide interval), and the link 13 is shown as a single hatch (with a small interval).

  The link arrangement of the chain 1 of the present invention is such that each of the three types of link rows A, B, and C has two links adjacent to each other at the end in the chain width direction within one link row. They are arranged with one link between each of the other two link rows in between. More specifically, in this embodiment, one link row is a link between two adjacent links other than the central portion in the chain width direction in the one link row. Are arranged one by one. Further, since the thicknesses of all links in the link rows A, B, and C are the same, all the two links sandwiching the two links have a constant interval g. Yes.

This arrangement will be described in detail. First, in the first link row A, the two links 11a and 11b adjacent to each other at one end in the chain width direction in the first link row A The link row B of the first link 12b and the link 13b of the third link row C are sandwiched. The two links 11h and 11g adjacent to each other at the other end opposite to each other have the one link 12h and the third link row C that the other second link B has. One link 13g is sandwiched. That is, only two links having the same thickness exist between two adjacent links at the end.
Further, in the first link row A, the other two second links are also formed in a portion other than the central portion in the chain width direction, that is, between two links adjacent in the chain width direction except between the two links 11d and 11e. Each of the links 12 and 13 of the second and third link rows B and C is sandwiched one by one. Note that only one link 12e of the second link row A is sandwiched between the two links 11d and 11e in the central portion. Accordingly, in the first link row A, the interval g between the two links other than between the two links 11d and 11e in the central portion is set to be equal.

Next, in the second link row B, the two links 12a and 12b adjacent at one end in the chain width direction in the second link row B are included in the other third link row C. 1 link 13a and the 1 link 11a which the 1st link row A has are pinched | interposed. The two links 12h and 12i adjacent to each other at the other end are the one link 11h and the third link rows A and C that the other first link row A has. One link 13h is sandwiched. That is, only two links having the same thickness exist between two adjacent links at the end.
In the second link row B, the center link 12e among the nine links 12 is arranged on the center line c in the chain width direction. In addition, between the two adjacent links 12 in the second link row B, the two links 11 and 13 of the other two first and third link rows A and C are sandwiched. The intervals g between two adjacent links 12 in the second link row B are all equally spaced.

Further, in the third link row C, the two links 13a and 13b adjacent to each other in the chain width direction in the third link row C have the other first link row A. One link 11a and one link 12b possessed by the second link row B are sandwiched. The two links 13g and 13h adjacent to each other at the other end are the one link 12h that the other second link row B has and the first link row A. One link 11h is sandwiched. That is, only two links having the same thickness exist between two adjacent links at the end.
Further, in the third link row C, the other two first portions other than the central portion in the chain width direction, that is, between the two links adjacent in the chain width direction other than between the two links 13d and 13e. And the links 11 and 12 of the second link row A and B are sandwiched one by one. In addition, between the links 13d and 13e in the central portion, there are a total of three links including two links 11d and 11e in the first link row A and one link 12e in the second link row B. Existing. That is, in the third link row C, the interval g between the links 13 other than between the links 13d and 13e in the center is set to be equal.

  The overall arrangement of the links that the chain 1 has will be further described. Each of the first link row A, the second link row B, and the third link row C has links arranged symmetrically with respect to the center line c in the chain width direction. As a result, the load acting in the power transmission chain can be equalized, and the generation of moments caused by the configuration can be suppressed.

  Further, the chain 1 of the present invention does not sandwich two links adjacent in the chain width direction of another link row between two links adjacent in the chain width direction of one link row. It becomes an array. Specifically, in the conventional chain shown in FIG. 9, for example, the third link row C has between the links 50 a and 50 b adjacent to each other in the chain width direction in the first link row A. Two adjacent links 52a and 52b are sandwiched in the chain width direction. Therefore, the conventional chain is disadvantageous in terms of lubrication, and the friction loss between the first link row A and the third link row C becomes large, resulting in a loss of power transmission. Friction loss is reduced, and the occurrence of such loss can be suppressed.

According to the above embodiment, in each of a set of link rows A, B, and C, between two adjacent links at the end in the chain width direction in one link row, the other two Since there are only two links in the link row, the distance (interval g) between the links can be reduced. As a result, even if a large load acts on the end portions of the link rows A, B, and C, this load is borne by the link at the endmost portion in the chain width direction and the link on the center side from this. Therefore, it is possible to mitigate the application of a large load to the endmost link. In particular, since the first link row A and the third link row B have fewer links than the second link row B, the load that one link bears increases. However, as in the present invention, By reducing the distance g between the two links at the end, it is possible to prevent the load sharing ratio of one link at the end from being biased.
Furthermore, in each of the link rows A, B, and C, between the two adjacent links other than the central portion in the chain width direction of one link row, there are links that the other two link rows respectively have. One by one, that is, a total of two. As a result, the interval g between two adjacent links other than the central portion in the chain width direction can also be reduced, and furthermore, the two links other than the central portion are all equally spaced. Therefore, the load acting on one link row can be equalized as much as possible in the link row.
As described above, the fatigue of the link due to the rotation of the chain 1 is effectively prevented, the durability of the chain 1 is improved, and power can be transmitted stably over a long period of time.

  Note that the power transmission chain of the present invention is not limited to the illustrated form, and may be of other forms within the scope of the present invention. For example, in the chain 1 shown in FIGS. With the link row B as a reference, the positions of the first link row A and the third link row C in the chain traveling direction may be interchanged. That is, referring to FIG. 7, the link 11d of the first link row A is located at the rear of the link 12e in the chain traveling direction with reference to the center link 12e of the second link row B having nine links 12. Although 11e is provided, although not shown in the figure, on the contrary, the link 12e may be provided with the links 11d and 11e of the first link row A at the front part in the chain traveling direction. Further, the number of links included in each link row A, B, C can be changed.

  Next, FIG. 8 is a schematic perspective view showing a configuration of a main part of a chain type continuously variable transmission (hereinafter also simply referred to as “continuously variable transmission”) according to an embodiment of the power transmission device of the present invention. . The continuously variable transmission according to the present embodiment is mounted on, for example, an automobile, and includes a metal drive pulley 2 as a first pulley, a metal driven pulley 3 as a second pulley, and an endless bridge spanned therebetween. The power transmission chain 1 is provided. Note that the chain 1 in FIG. 8 partially shows a cross section.

The drive pulley 2 is attached to an input shaft 4 connected to the engine side so as to be integrally rotatable. The drive pulley 2 is disposed so as to face the fixed sheave 6 having a conical sheave surface 6a and the sheave surface 6a. And a movable sheave 7 having a conical surface 7a. The sheave surfaces 6a and 7a form a V-shaped groove. The sheave surfaces 6a and 7a constituting the groove sandwich the both ends of the pin member (first pin 14) of the chain 1 with a strong pressure so that the end surface and the sheave Power is transmitted between the first and second pulleys by the frictional force with the surface. In addition, the said end surface of a pin member is the meaning containing the end surface of the said contact member when the contact member for the said friction contact is attached to the both ends of the center main-body part among pin members.
Further, a hydraulic actuator (not shown) for changing the groove width is connected to the movable sheave 7, and the groove width is changed by moving the movable sheave 7 at the time of shifting, whereby the input shaft 4 The winding radius of the chain 1 is changed.

  On the other hand, the driven pulley 3 is attached to an output shaft 5 connected to the drive wheel side so as to be integrally rotatable. Like the drive pulley 2, the driven pulley 3 includes a fixed sheave 8 and a movable sheave 9. Sheave surfaces 8a and 9a for forming grooves sandwiched by strong pressure are provided. Further, a hydraulic actuator (not shown) is connected to the movable sheave 9 of the pulley 3 in the same manner as the movable sheave 7 of the drive pulley 2, and the groove width is increased by moving the movable sheave 9 at the time of shifting. As a result, the winding radius of the chain 1 with respect to the output shaft 5 is changed.

The chain 1 spanned between the drive pulley 2 and the driven pulley 3 is a chain according to the present invention. Since the details of the chain are as described above, the description thereof is omitted.
The continuously variable transmission according to the present embodiment configured as described above can perform a continuously variable transmission as follows. When the rotation of the output shaft 5 is decelerated, the groove width on the drive pulley 2 side is increased by the movement of the movable sheave 7 to reduce the winding diameter of the chain 1 around the input shaft 11, while the driven sheave 9 side has a movable sheave 9. , The groove width is reduced, and the winding diameter of the chain 1 around the output shaft 21 is increased. Thereby, the rotation of the output shaft 21 can be decelerated. On the contrary, when the rotation of the output shaft 21 is increased, the drive pulley 2 and the driven pulley 3 may perform operations opposite to the above operations.

According to the continuously variable transmission according to the present embodiment configured as described above, the use of the power transmission chain 1 shown in FIGS. Thus, a continuously variable transmission capable of transmitting power can be obtained.
The power transmission device of the present invention is not limited to a mode in which the groove widths of both the drive pulley and the driven pulley are changed, but only one of the groove widths is changed and the other is a fixed width that does not change. It may be an embodiment. In the above description, the groove width continuously (steplessly) has been described. However, the groove width may vary stepwise, or may be applied to other power transmission devices such as a fixed type (no shift). Also good.

It is a perspective view which shows the principal part structure of the power transmission chain of this invention. It is a front view of the principal part structure of the power transmission chain of this invention. It is a right view of the principal part structure of the power transmission chain of this invention. It is a left view of the principal part structure of the power transmission chain of this invention. It is a top view of the principal part structure of the power transmission chain of this invention. It is a bottom view of the principal part structure of the power transmission chain of this invention. It is the top view which showed typically arrangement | positioning of the several link which this invention has. It is the perspective view which showed typically the principal part structure of the power transmission device of this invention. It is the top view which showed typically the general arrangement | positioning of the link which the conventional power transmission chain has.

Explanation of symbols

1 Power transmission chain 2 Drive pulley (first pulley)
3 Driven pulley (second pulley)
11 link 12 link 13 link 14 pin 15 strip 16 end face A 1st link row B 2nd link row C 3rd link row c Center line

Claims (4)

The first, second, and third link rows are provided as a set, and a plurality of sets are continuously provided. Each link row has a plurality of links arranged in the chain width direction and is adjacent to the chain traveling direction. Are connected using a pin member, and in the power transmission chain in which the end surface of the pin member contacts the power transmission target surface,
Each of the one set of link rows is arranged with two links adjacent to each other at the end in the chain width direction in one link row, with each link of the other two link rows one by one Power transmission chain characterized by being made.   Each of the one set of link rows sandwiches each link of the other two link rows one by one between two adjacent links other than the central portion in the chain width direction in one link row. The power transmission chain according to claim 1, further comprising an array portion.   3. The power transmission chain according to claim 1, wherein each of the first, second, and third link rows has the links arranged symmetrically with respect to a center line in the chain width direction. A first pulley having a conical sheave surface;
A second pulley having a conical sheave surface;
A power transmission device comprising a power transmission chain bridged between the first and second pulleys,
The power transmission chain according to any one of claims 1 to 3, wherein the power transmission chain is a power transmission chain.

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