JP4882921B2 - Power transmission chain manufacturing method and press-fitting jig used therefor - Google Patents

Description

  The present invention relates to a method for manufacturing a power transmission chain and a press-fitting jig used therefor, and more specifically, a method for manufacturing a power transmission chain suitable for a continuously variable transmission (CVT) of a vehicle such as an automobile and a press-fitting jig used therefor About.

  As a continuously variable transmission for an automobile, as shown in FIG. 7, a drive pulley (2) provided on the engine side having a fixed sheave (2a) and a movable sheave (2b), a fixed sheave (3b) and a movable sheave (3a) and a driven pulley (3) provided on the drive wheel side and an endless power transmission chain (1) spanned between them, and a movable sheave (2b) (3a) by a hydraulic actuator The chain (1) is clamped with hydraulic pressure by moving it toward and away from the fixed sheave (2a) (3b), and this clamping force makes contact between the pulley (2) (3) and the chain (1). It is known that a load is generated and torque is transmitted by the frictional force of the contact portion.

  As a power transmission chain suitable for such a continuously variable transmission, a plurality of links having front and rear insertion portions through which pins are inserted, a front insertion portion of one link, and a rear insertion portion of another link correspond. In this way, a plurality of first pins and a plurality of second pins arranged before and after connecting the links arranged in the chain width direction are provided. Bending in the vertical direction is possible, and one of the first pin and the second pin is fixed to the front insertion portion of one link and movably fitted to the rear insertion portion of the other link, The other is movably fitted in the front insertion portion of one link and fixed to the rear insertion portion of the other link, and the plurality of links include at least two types having different pitch lengths. Things are known.

In Patent Document 1, as a manufacturing method thereof, as shown in FIG. 6, a required number of pin insertion holes (42) are arranged so that a required number of pins (14) and (15) are arranged when assembled as a chain. ) Is used, and the required number of pins (14) (15) are fitted into the respective pin insertion holes (42) of the press-fitting jig (41), and these pins (14) It has been proposed that the link (11) is sequentially pressed into (15).
Japanese Patent Laid-Open No. 2006-95583

  In the conventional power transmission chain, links with different pitch lengths are randomly arranged to obtain a noise reduction effect. However, according to the conventional manufacturing method, when it is necessary to change the arrangement of the links, it is necessary to remodel the entire press-fitting jig with a new one. For example, in order to evaluate the noise reduction effect, a plurality of types of arrangements are required. It was difficult to easily implement this in a short period of time when making and evaluating a product.

  The object of the present invention is to quickly and easily change a part of the link arrangement quickly when manufacturing a power transmission chain in which two or more types of links having different pitch lengths are used and links having different pitch lengths are randomly arranged. It is an object of the present invention to provide a method for manufacturing a power transmission chain and a press-fitting jig used therefor.

  In the power transmission chain manufacturing method according to the present invention, a required number of pins are arranged in a circular press-fitting jig at a required pitch and held in an arrangement state when assembled as a chain, and the pitch lengths of these pins are different. In the method of manufacturing a power transmission chain in which two or more types of links are sequentially press-fitted, a press-fitting jig is formed by arranging a plurality of fan-shaped elements having pin insertion holes formed at a required pitch length in the circumferential direction, The arrangement order of the plurality of sector elements can be changed.

  The press-fitting jig according to the present invention has a plurality of links composed of two or more types of links having different pitch lengths and a plurality of pins connecting the links arranged in the chain width direction, and each pin is fixed to the link by press-fitting. This is a press-fitting jig used in manufacturing a power transmission chain that is formed into a circular shape by arranging a plurality of fan-shaped elements having pin insertion holes formed at a required pitch in the circumferential direction. The arrangement order of the plurality of sector elements can be changed.

  A power transmission chain with reduced noise can be obtained by randomly arranging two types of links having different pitch lengths, and noise can be further reduced by optimizing the arrangement. The plurality of fan-shaped elements include several types (two or more types). For example, when there are two types of L and S, and four L and two S are used, LLLLSS and LLLLSS , LLLSSL,... Can be arranged. Whereas a conventional press-fitting jig is required for one type of arrangement, according to the press-fitting jig of the present invention, a chain with a different arrangement can be obtained only by rearranging the sector elements. One sector element may include one or two pin insertion holes corresponding to one link, or may include three or more pin insertion holes. The number of pin insertion holes included in each sector element may be the same or different.

  The press-fitting jig is manufactured using carbon tool steel or alloy tool steel, and is attached to a press machine or the like. At this time, the press-fitting jig is supported so as to be rotatable relative to the link supply device around a central axis (for example, a vertical axis).

  The above manufacturing method and press-fitting jig are suitable for manufacturing various power transmission chains that require press-fitting, but a plurality of links having front and rear insertion portions through which pins are inserted, A plurality of first pins and a plurality of second pins arranged before and after connecting links arranged in the chain width direction so that an insertion portion and a rear insertion portion of another link correspond to each other, and the first pin and the second pin are provided By relatively rolling and moving, the links can be bent in the length direction, and one of the first pin and the second pin is fixed to the front insertion portion of one link by press-fitting. The other link is movably fitted into the rear insertion part of the other link, and the other is movably fitted into the front insertion part of one link and fixed to the rear insertion part of the other link by press-fitting. Is the power transmission chain It is more suitable for production. In this case, the press-fitting is preferably performed at the edges (upper and lower edges) of the portion orthogonal to the length direction of the insertion portion.

  In this case, the number of links arranged in the same position in the chain width direction is about 20 to 30, and the chain is assembled by laminating, for example, 25 layers. The number of pin insertion holes provided in the press-fitting jig is about 60 to 100.

  In the power transmission chain, at least one of the first pin and the second pin comes into contact with the pulley to transmit power by frictional force. In a chain in which one of the pins contacts the pulley, one of the first pin and the second pin is a pin that contacts the pulley when the chain is used in a continuously variable transmission ( In the following, the pin is referred to as “first pin” or “pin”, and the other is referred to as the pin that does not contact the pulley (interpiece or strip). "Peace").

  For example, the link is made of spring steel or carbon tool steel. The material of the link is not limited to spring steel or carbon tool steel, and may of course be other steel such as bearing steel. In the link, the front and rear insertion portions may be independent through holes (links with columns), and the front and rear insertion portions may be one through holes (links without columns). Appropriate steel such as bearing steel is used as the material of the pin.

  According to the power transmission chain manufacturing method and press-fitting jig of the present invention, when a plurality of types of arrangements are prototyped and evaluated, a plurality of fan-shaped elements are used instead of creating a plurality of circular press-fitting jigs. By using one press-fitting jig formed in a circle by being arranged in the circumferential direction, and changing the arrangement order, press-fitting jigs having different random arrangements can be obtained. This eliminates the need to create a new jig, eliminates the need for large-scale setups, and allows a quick and easy response to partial array changes, thus increasing development speed and reducing development costs. Reduced.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the top and bottom refer to the top and bottom of FIG.

  FIG. 1 shows a part of a power transmission chain manufactured by using a power transmission chain manufacturing method and a press-fitting jig according to the present invention. The power transmission chain (1) has a predetermined distance in the chain length direction. A plurality of links (11) having front and rear insertion portions (12) and (13) provided with a plurality of pins (first pins) that connect the links (11) arranged in the chain width direction so as to be bent in the length direction. 1 pin) (14) and an interpiece (second pin) (15). The interpiece (15) is made shorter than the pin (14), and both are opposed to each other with the interpiece (15) disposed on the front side and the pin (14) disposed on the rear side.

  In the chain (1), three link rows composed of a plurality of links having the same phase in the width direction are arranged in the traveling direction (front-rear direction) to form one link unit, and the link unit composed of the three rows of link rows is the traveling direction. Are connected to each other. In this embodiment, one link unit includes a link row having nine links and two link rows having eight links.

  As shown in FIG. 2, a column part (21) is interposed between the front insertion part (12) and the rear insertion part (13) of the link (11), and the front insertion part (12) The pin (14) is movably fitted to the pin movable part (16) and the interpiece fixing part (17) to which the interpiece (15) is fixed.The rear insertion part (13) is the pin (14) It consists of a pin fixing part (18) to which is fixed and an interpiece movable part (19) to which the interpiece (15) is movably fitted.

  Each pin (14) is wider in the front-rear direction than the interpiece (15), and the upper and lower edges of the interpiece (15) have protruding edges (15a) extending to the respective pins (14) side. ) (15b).

  In FIG. 2, the portions indicated by reference signs A and B are lines (points in the cross section) where the pin (14) and the interpiece (15) are in contact with each other in the straight portion of the chain (1), and the distance between AB Is the pitch.

  When connecting the links (11) aligned in the chain width direction, the links (11) so that the front insertion part (12) of one link (11) and the rear insertion part (13) of the other link (11) correspond to each other ( 11) are overlapped with each other, the pin (14) is fixed to the rear insertion part (13) of one link (11) and movably fitted to the front insertion part (12) of the other link (11), The interpiece (15) is movably fitted to the rear insertion portion (13) of one link (11) and fixed to the front insertion portion (12) of the other link (11). The pins (14) and the interpiece (15) are relatively rolled and brought into contact with each other, whereby the links (11) can be bent in the length direction (front-rear direction).

  At the boundary between the pin fixing part (18) of the link (11) and the interpiece movable part (19), the upper and lower concave arcuate guide parts (19a) (19b) of the interpiece movable part (19) are connected. Upper and lower convex arc-shaped holding portions (18a) and (18b) for holding the pin (14) fixed to the pin fixing portion (18) are provided. Similarly, at the boundary between the interpiece fixing part (17) and the pin movable part (16), the upper and lower concave arcuate guide parts (16a) and (16b) of the pin movable part (16) are connected to the interpiece fixed part. Upper and lower convex arc-shaped holding portions (17a) and (17b) for holding the interpiece (15) fixed to the portion (17) are provided.

  The locus of the contact position between the pin (14) and the interpiece (15) with respect to the pin (14) is an involute curve.In this embodiment, the contact surface of the pin (14) has a radius in cross section. It has an involute shape with a basic circle of Rb and center M, and the contact surface of the interpiece (15) is a flat surface (cross-sectional shape is a straight line). As a result, when each link (11) moves from the straight portion of the chain (1) to the curved portion or from the curved portion to the straight portion, the pin (14) is fixed in the front insertion portion (12). The contact surface of the piece (15) moves in the pin movable part (16) while rolling (including some sliding contact) to the contact surface of the interpiece (15), and in the rear insertion part (13) The interpiece (15) rolls into contact with the contact surface of the pin (14) with respect to the pin (14) fixed in the interpiece movable part (19) (including some sliding contact). Move while.

  In the above power transmission chain (1), polygonal vibration is caused by repeated vertical movement of the pin, which causes noise, but the pin (14) and the interpiece (15) are relatively rolled and moved in contact. When the contact surface of the pin (14) and the interpiece (15) with respect to the pin (14) is an involute curve, both the contact surface of the pin and the interpiece are arc surfaces As compared with the above, vibration can be reduced and noise can be reduced.

  In this chain, as the link (11), two or more types having different pitch lengths are used, and these are arranged over the entire length of the chain (1) by a predetermined arrangement pattern (random arrangement). The links (11) having different pitch lengths can be obtained by increasing or decreasing the length of the pillar portion (21) with the same shape of the front and rear insertion portions (12) and (13). According to this random arrangement, the sound generation period is shifted, the sound energy is dispersed in different frequency bands, the peak of the sound pressure level is reduced, and the noise reduction effect is further improved.

  The power transmission chain (1) is used in the CVT shown in FIG. 7. At this time, as shown in FIG. 3, the fixed sheave (2a) and the movable sheave of the pulley (2) having the pulley shaft (2e) are used. The end surface of the pin (14) is the conical sheave surface (2c) of the pulley (2) in a state where the end surface of the interpiece (15) is not in contact with each conical sheave surface (2c) (2d) of the sheave (2b). 2d) is contacted, and power is transmitted by the frictional force generated by this contact.

  In FIG. 3, when the movable sheave (2b) of the drive pulley (2) at the position indicated by the solid line is moved toward and away from the fixed sheave (2a), the winding diameter of the drive pulley (2) is as shown in FIG. As indicated by the chain line, the value is large when approaching and small when separated. In the driven pulley (3), although not shown in the drawing, when the movable sheave moves in the opposite direction to the movable sheave (2b) of the drive pulley (2) and the winding diameter of the drive pulley (2) increases, the driven pulley When the winding diameter of (3) decreases and the winding diameter of the drive pulley (2) decreases, the winding diameter of the driven pulley (3) increases. As a result, on the basis of the state where the gear ratio is 1: 1 (initial value), the winding diameter of the drive pulley (2) is minimum and the winding diameter of the driven pulley (3) is maximum U / D. An (underdrive) state is obtained, and an O / D (overdrive) state in which the winding diameter of the drive pulley (2) is maximum and the winding diameter of the driven pulley (3) is minimum is obtained.

  The power transmission chain (1) is manufactured by sequentially press-fitting a required number of links (11) after holding a required number of pins (14) and an interpiece (15). This press-fitting is performed between the upper and lower edges of the pin (14) and the interpiece (15) and the upper and lower edges of the pin fixing part (18) and the interpiece fixing part (17). It is set to 0.005 mm to 0.1 mm.

  4 and 5 show a press-fitting jig used in the method for manufacturing a power transmission chain according to the present invention.

  The power transmission chain is manufactured by placing all pins (14) and interpieces (15) used in the chain (1) in pairs at a predetermined pitch on the press-fitting jig (30) as the chain (1). The pin holding process that holds the assembled state when assembled, and the link (11) used in the chain (1) is stacked on these pins (14) and the interpiece (15) so that they are stacked in the chain width direction. A link press-fitting step of sequentially press-fitting the link (11).

  As shown in FIG. 6, the conventional press-fitting jig (41) is a circular and integral one having a number of pin insertion holes (42) corresponding to all the pins (14) and the interpiece (15). However, the press-fitting jig (30) according to the present invention is of a split type, and the two types of sector elements (31) and (32) shown in FIG. Is formed. FIG. 5 schematically shows a part of the circular press-fitting jig (30).

  In FIG. 4, each sector element (31) (32) has two pin insertion holes (33), and the relatively large sector element (31) is abutted against elements adjacent in the circumferential direction. Therefore, the counterclockwise (left) and clockwise (right) connecting portions (31a) and (31b) that form an L pitch (long pitch) and the connecting portions (31a) and (31b) And a main body portion (31c) that forms a pitch (long pitch). Further, the relatively small fan-shaped element (32) is connected to the elements adjacent to each other in the circumferential direction so as to form an L pitch (long pitch), and a counterclockwise (left) and clock (right) connecting portion. (32a) (32b) and a main body portion (32c) between the connecting portions (32a) and (32b) and forming an S pitch (short pitch).

  Each pin insertion hole (33) has a bottom, and its depth is the amount of protrusion of the pin (14) and the interpiece (15) from the outermost one of the links (11) aligned in the chain width direction ( The bottom surface of the pin insertion hole (33) is stepped so that the pin (14) and the interpiece (15) each have a predetermined allowance. The cross-sectional shape of the pin insertion hole (33) is almost the same as that of the front and rear insertion portions (12) and (13) of the link (11), and the pin (14) and the interpiece (15) can be inserted and removed. The fitting is such that the inserted pin (14) and the interpiece (15) are movable.

  The press-fitting jig (30) is the same as the conventional press-fitting jig (41) shown in FIG. 6 except that it is a split type, and is rotatable about a vertical axis. When manufacturing the chain, first, the pin (14) and the interpiece (15) are inserted into each pin insertion hole (33) while rotating the press-fitting jig (30), and then the link supply device (not shown) To place the link (11) on the upper end of the pin (14) and the interpiece (15), then lower the link pressing jig (not shown) to move the link (11) to a predetermined position, The chain (1) is assembled by repeating the arrangement of the links and the lowering of the link pressing jig.

  FIG. 5 shows seven sector elements (31) and (32). In FIG. 5 (a), the arrangement order is from the counterclockwise side (left side), with the first sector being relatively large. Element (31), second is relatively large sector element (31), third is relatively large sector element (31), fourth is relatively small sector element (32), fifth Is a relatively large fan-shaped element (31), the sixth is a relatively small fan-shaped element (32), and the seventh is a relatively large fan-shaped element (31). An array of minutes LLLLLLLSLLLSLL has been obtained. In FIG. 5B, the relatively large sector elements (31) on the second and fifth sides from the counterclockwise side (left side) are replaced with relatively small sector elements (32), respectively. As a result, an array of LLSLLLLLLSLLL for 13 pitches as different pitches is obtained. FIGS. 5 (a) and 5 (b) show an example of a part, and by using a larger number of sector elements (31) and (32) and changing their arrangement positions in various ways, a large number of arrangements can be obtained. Obtainable.

  Therefore, for example, when evaluating and evaluating a plurality of types of arrays in order to evaluate the noise reduction effect, conventionally, it is necessary to manufacture one press-fitting jig (41) per one array. Although the labor, period and cost are enormous, according to the press-fitting jig (30) of the present invention, as shown in FIG. 5, it can be dealt with only by changing the arrangement of the sector elements (31) and (32). As a result, the development speed is increased, and the development cost is reduced, thereby enabling cost reduction.

  In the above, each of the connecting portions (31a) (31b) (32a) (32b) of the relatively large sector element (31) and the relatively small sector element (32) is an element adjacent in the circumferential direction. Although it is supposed to form a pitch of L (long pitch) by being connected, it is of course possible to form a pitch of S (short pitch), and a relatively large sector element (31) and relative For each of the small fan-shaped elements (32), create two types, one where each connection part (31a) (31b) (32a) (32b) forms an L pitch and another forms an S pitch. Thus, the degree of freedom in changing the arrangement can be further increased. Each main body (31c) (32c) has two pin insertion holes (33), but one main body (31c) (32c) has three or more pin insertion holes (33). Of course, it is not necessary that all the fan-shaped elements have the same number of pin insertion holes (33). For example, a fan-shaped element having two pin insertion holes (33) and three pin insertion holes. The press-fitting jig may be configured by using at least one fan-shaped element having (33) and five fan-shaped elements having five pin insertion holes (33). In any case, different pitch random arrangements can be obtained only by changing the arrangement of the sector elements, and the above effects can be obtained.

  The manufacturing method and the press-fitting jig are not limited to the shapes of the link, pin, and interpiece, and can be applied to various power transmission chains having components having different pitch lengths.

FIG. 1 is a plan view showing a part of one embodiment of a power transmission chain manufactured by the method of manufacturing a power transmission chain according to the present invention. FIG. 2 is an enlarged side view of the link. FIG. 3 is a front view showing a state in which the power transmission chain is attached to the pulley. FIG. 4 is a plan view showing a fan-shaped element of a press-fitting jig used in the method for manufacturing a power transmission chain according to the present invention. FIG. 5 is a plan view showing an example of the array of sector elements. FIG. 6 is a perspective view showing a conventional press-fitting jig. FIG. 7 is a perspective view showing a continuously variable transmission.

Explanation of symbols

(1) Power transmission chain
(11) Link
(14) Pin (1st pin)
(15) Interpiece (2nd pin)
(30) Press-fitting jig
(31) (32) Fan-shaped element
(33) Pin insertion hole

Claims (2)

Place the required number of pins on a circular press-fitting jig at the required pitch and hold them in an array when assembled as a chain, and then press-fit two or more types of links with different pitch lengths into these pins. In the power transmission chain manufacturing method,
Power transmission characterized in that a press-fitting jig is formed by arranging a plurality of sector elements having pin insertion holes formed at a required pitch length in the circumferential direction, and the arrangement order of the plurality of sector elements can be changed. Chain manufacturing method. When manufacturing a power transmission chain having a plurality of links composed of two or more types of links having different pitch lengths and a plurality of pins connecting the links arranged in the chain width direction and each pin being fixed to the link by press fitting A press-fitting jig used,
A plurality of fan-shaped elements having pin insertion holes formed at a required pitch are formed in a circular shape by being arranged in the circumferential direction, and the arrangement order of the plurality of fan-shaped elements can be changed. Press fitting jig.

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