JP2008188597A - Method of producing power transmission chain and press-fitting apparatus used in the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of producing a power transmission chain where the time required for the press-fitting links is reduced, and assembling cost can be reduced, and to provide a press-fitting apparatus used in the method. <P>SOLUTION: The press-fitting apparatus 40 is provided with: a disk-shaped pin retaining jig 41 having a required number of pin insertion holes 42 into which the lower end parts of all pins 41 and interpieces 15 can be inserted; and a required number of pin insertion holes 44 into which all the pins 14 and interpieces 15 can be inserted, and is provided with a disk-shaped link pressing jig 43 simultaneously pushing all links lying at the same position in a chain width direction into prescribed positions. A link press-fitting process includes: a link arrangement stage for arranging all the links 11 to come to the same position in a chain width direction at one end part of the pins 14 and the interpieces 15; and a ling pressing stage for simultaneously press-fitting all the links to come to the same position in a chain width direction, and positioning them to the prescribed positions of the pins 14 and the interpieces 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a power transmission chain and a press-fitting device used therefor, and more particularly to 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 device used therefor.

  As a continuously variable transmission for an automobile, as shown in FIG. 6, 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). 2. Description of the Related Art A chain-type continuously variable transmission that generates a load and transmits torque by the frictional force of the contact portion is known.

A power transmission chain suitable for such a continuously variable transmission includes a plurality of links through which pins are inserted and a plurality of pins that connect links arranged in the chain width direction, and each pin is fixed to the link by press-fitting. Patent Document 1 discloses a manufacturing method in which a required number of pins are vertically arranged at a predetermined pitch and held in an array when assembled as a chain. A method has been proposed in which links are pressed into these pins one by one.
Japanese Patent Laid-Open No. 2006-95583

  According to the above conventional power transmission chain manufacturing method, the links are press-fitted one by one. Therefore, if the number of links constituting the chain increases, the time required for the press-fitting of the links increases, and the assembly cost increases. It will be.

  An object of the present invention is to provide a method for manufacturing a power transmission chain that can reduce the time required for press-fitting a link and reduce the assembly cost, and a press-fitting device used therefor.

  In the power transmission chain manufacturing method according to the present invention, a required number of pins are arranged at a predetermined pitch and held in an array when assembled as a chain, and a required number of links are press-fitted into these pins. In the method of manufacturing a power transmission chain provided with a link press-fitting step, the link press-fitting step includes a link placement step in which all links having the same position in the chain width direction are arranged at one end of the pin, and a position in the chain width direction that is the same. And a link pressing step for simultaneously pressing all the links to be positioned at predetermined positions of the pins.

  The pin is supported vertically or horizontally. The links may be arranged one by one, or all the links may be arranged at the same time. However, it is preferable to divide the links into a plurality of times and perform them several by one. The press-fitting of the link may be performed using a servo motor.

  More preferably, the power transmission chain has a gap between links arranged in the chain width direction. In such a power transmission chain, if adjacent links in the chain width direction are in strong contact with each other, there is a problem that the link is likely to wear due to frictional force, and if there is no contact, string vibration of the chain occurs. Since the frictional force that serves as a deterrence force in the case is lost, there is a problem that vibration and noise increase. In the conventional method of press-fitting links one by one, it is difficult to manage the gap due to variations in the press-fitting, but by pressing all the links at the same position in the chain width direction at the same time The gap between the links arranged in the chain width direction can be easily managed, the accuracy of the gap obtained at the time of press-fitting can be improved, and wear and vibration can be balanced by an appropriate gap. In addition, when performing press-fitting one by one, it is necessary to press-fit at a high speed in order to shorten the total press-fitting time. However, press-fitting all the links at the same time can greatly reduce the press-fitting man-hours. As compared with the case of performing one sheet at a time, the press-fitting can be performed slowly, whereby the accuracy can be further improved.

  The press-fitting device according to the present invention includes a plurality of links and a plurality of pins connecting the links arranged in the chain width direction, and the press-fitting used when manufacturing a power transmission chain in which each pin is fixed to the link by press-fitting. A device, a pin holding jig having a required number of pin insertion holes into which one end of all pins can be inserted, and a required number of pin insertion holes into which the other end of all pins can be inserted, A link pressing jig for pressing all the links at the same position in the chain width direction simultaneously to a predetermined position of the pin is provided.

  The pin holding jig and the link pressing jig are manufactured using carbon tool steel or alloy tool steel, and are attached to a press machine or the like. At this time, the pin holding jig is supported so as to be rotatable relative to the link supply device around a central axis (for example, a vertical axis), and the link pressing jig is relatively centered with respect to the pin holding jig. It is supported so as to be movable in the axial direction. The pin insertion holes of the pin holding jig are formed so that the required number of pins are arranged at a predetermined pitch and held in an arrayed state when assembled as a chain, and the pin insertion holes of the link pressing jig are pin holding It is formed at a position corresponding to the pin insertion hole of the jig.

  The manufacturing method and the press-fitting device described above 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, and front insertion of one link And a plurality of first pins and a plurality of second pins arranged before and after connecting the links arranged in the chain width direction so that the rear insertion portion of the other link and the other link correspond to each other, and the first pin and the second pin are relative to each other In the rolling contact movement, the links can be bent in the longitudinal direction, and one of the first pin and the second pin is fixed to the front insertion portion of one link by press-fitting and The other link is movably fitted in the rear insertion portion of the other link, and the other is movably fitted in the front insertion portion of one link and fixed to the rear insertion portion of the other link by press-fitting. A 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 and pin insertion holes provided in the pin holding jig and the link pressing 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").

  The link is made of, for example, 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 device of the present invention, the time required for press-fitting the link can be reduced, and the assembly cost can be reduced. In addition, it becomes easy to accurately manage the gap between the links adjacent in the chain width direction.

  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 device according to the present invention. The power transmission chain (1) has a predetermined interval in the chain length direction. A plurality of links (11) having front and rear insertion portions (12) and (13) provided at the front and a plurality of pins (first ones) for connecting the links (11) arranged in the chain width direction so that they can be bent in the length direction 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 (the 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.

  This power transmission chain (1) is used in the CVT shown in FIG. 6, and 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). The end surface of the pin (14) is the conical sheave surface (2c) of the pulley (2) with the end surface of the interpiece (15) 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, with reference to the state (initial value) where the gear ratio is 1: 1, U / D has the minimum winding diameter of the drive pulley (2) and the maximum winding diameter of the driven pulley (3). 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 method of manufacturing a power transmission chain according to the present invention and a press-fitting device used therefor. In the following description, “upper and lower” refers to the upper and lower sides of the figure, but this is for convenience, and the left and right sides of the figure may be up and down.

  The manufacturing method of the power transmission chain is the arrangement state when all pins (14) and interpieces (15) used in the chain (1) are arranged at a predetermined pitch and assembled as a chain (1). The pin holding process to hold the link (11) and link (11) to these pins (14) and interpiece (15) so that all the links (11) used in the chain (1) are stacked in the chain width direction. And a link press-fitting process of sequentially press-fitting.

  The link press-fitting process is the same as the link placement process in which all links (11) that are in the same position in the chain width direction are placed on the upper ends of all pins (14) and interpieces (15), and all links that are in the same position in the chain width direction. A link pressing step of simultaneously press-fitting the links (11) and positioning the pins (14) and the interpiece (15) at predetermined positions.

  The press-fitting device (40) includes a disc-shaped pin holding jig (41) having a required number of pin insertion holes (42) into which all the pins (14) and the lower end of the interpiece (15) can be inserted, and all The pin (14) and interpiece (15) have the required number of pin insertion holes (44), and all the links (11) at the same position in the chain width direction can be connected to the pin (14) and interpiece at the same time. A disk-shaped link pressing jig (43) for pressing to a predetermined position of (15).

  The pin insertion hole (42) of the pin holding jig (41) has a bottom, and its depth is determined by the pin (14) and interpiece from the outermost one of the links (11) aligned in the chain width direction. It is sized to match the protruding amount (protrusion allowance) of (15), and the bottom surface of the pin insertion hole (42) is such that the pin (14) and the interpiece (15) each have a predetermined allowance. It is stepped. The cross-sectional shape of the pin insertion hole (42) is almost the same as that of the front and rear insertion portions (12) and (13) of the link (11), and insertion and extraction of the pin (14) and the interpiece (15) are possible. The fitting is such that the inserted pin (14) and the interpiece (15) are movable.

  The outer diameter of the link pressing jig (43) is substantially equal to the outer diameter of the pin holding jig (41), and the pin (14) and the interpiece (15) held by the pin holding jig (41). After setting all the links (11) at the same position in the chain width direction to the link pressing jig (43) downward, all the links (11) at the same position in the chain width direction can be moved simultaneously. The pin (14) and the interpiece (15) can be pushed into place. The pin insertion hole (44) of the link pressing jig (43) is a through hole, and its cross-sectional shape is substantially the same as the front and rear insertion parts (12) (13) of the link (11), When the link pressing jig (43) is moved downward, the fitting is such that the pin (14) and the interpiece (15) come into contact with each other but do not interfere with each other.

  The pin holding jig (41) is rotatable about the vertical axis. First, the pin (14) and the interpiece (15) are not inserted while rotating the pin holding jig (41). First, after inserting the pin (14) and the interpiece (15) into the insertion hole (42) and completing the insertion of all the pins (14) and the interpiece (15) in parallel therewith, one layer Eye links (links located on the outermost side of the chain) (11) are arranged at the upper ends of all the pins (14) and the interpiece (15). The links (11) are arranged by a link supply device (not shown), and a plurality of links (11) are set at a time. Next, the link pressing jig (43) is lowered and the first layer link (11) is pressed against the upper surface of the pin holding jig (41). Next, the link (11) of the second layer is disposed on the upper ends of all the pins (14) and the interpiece (15), and then the link pressing jig (43) is lowered. The lowering amount at this time is not the close contact between the first layer link (11) and the second layer link (11), but the first layer link (11) and the second layer link (11) It is controlled so that a predetermined amount of gap is formed between the two. In this way, the links (11) arranged in 25 rows in the chain width direction are obtained by repeatedly lowering the link pressing jig (43) after arranging all the links (11) at the same position in the chain width direction. The chain (1) is assembled by 25 press-fitting operations.

  When the links (11) are press-fitted one by one, if the number of links in one layer is 25, the press-fitting frequency is 25 × 25 = 625 times. When the number of times is 1/25, the time required for press-fitting can be at least 1/10 or less. Further, the positions of all the links (11) for one layer are regulated by the link pressing jig (43), so that the gaps between the links (11) can be controlled with high accuracy. ) Position (up and down position during assembly, width direction position during chaining) can be greatly reduced, which also suppresses variation in the allowance that causes noise and stabilizes the gap between links. High quality chains can be assembled at low cost.

  The manufacturing method and the press-fitting device described above are not limited to the shapes of the link, pin, and interpiece, and can be applied to various press-fitting type power transmission chains.

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 perspective view showing a power transmission chain manufacturing method and press-fitting device according to the present invention. FIG. 5 is a vertical sectional view of the same. FIG. 6 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)
(40) Press-fitting device
(41) Pin holding jig
(42) Pin insertion hole
(43) Link pressing jig
(44) Pin insertion hole

Claims (2)

A power transmission chain comprising a pin holding step for holding a required number of pins arranged at a predetermined pitch and holding them in an array when assembled as a chain, and a link press-fitting step for press-fitting a required number of links into these pins In the manufacturing method of
In the link press-fitting process, all links that are at the same position in the chain width direction are arranged at one end of the pin, and all links that are at the same position in the chain width direction are simultaneously press-fitted and positioned at a predetermined position of the pin. A method for manufacturing a power transmission chain, comprising a link pressing step. A press-fitting device used when manufacturing a power transmission chain having a plurality of links 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 pin holding jig with a required number of pin insertion holes into which one end of all pins can be inserted, and a required number of pin insertion holes into which all pins can be inserted, and all the pins in the same position in the chain width direction. A press-fitting device comprising a link pressing jig that simultaneously presses the link to a predetermined position of the pin.

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