JP2009119507A - Power transmission chain pin assembly jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an assembly jig for a pin for a power transmission chain, which can prevent the pin from falling down and improve the assembly accuracy.
A pin assembly jig 41 abuts a body 41a in which a pin insertion portion 42 into which a pin 14 and an interpiece are inserted is formed in an annular shape, and a link 11 fitted to the pin insertion portion 42. A pin 14 and a guide portion 47 that prevents the interpiece from falling down are provided.
[Selection] Figure 5

Description

  The present invention relates to a power transmission chain pin assembly jig, and more particularly, to a pin assembly jig used when manufacturing a power transmission chain suitable for a continuously variable transmission (CVT) of a vehicle such as an automobile. .

  As a continuously variable transmission for an automobile, as shown in FIG. 8, 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 has 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. In this case, it has been proposed to press-fit links into these pins one by one from the lower end side.
Japanese Patent Laid-Open No. 2006-95583

  According to the above conventional power transmission chain manufacturing method, as the link is sequentially press-fitted from the lower end side of the pin, the pin held so as to be vertically tends to fall slightly inward. However, it becomes difficult to insert a new link, resulting in a problem that assembly accuracy is lowered.

  An object of the present invention is to provide a power transmission chain pin assembly jig capable of preventing the pin from falling to the inside and improving the assembly accuracy.

  The pin assembling jig according to the present invention is used when manufacturing a power transmission chain having a plurality of links and a plurality of pins connecting the links arranged in the width direction of the chain and each pin being fixed to the link by press-fitting. An assembly tool for a pin, a body in which a pin insertion portion into which a pin is inserted is formed in an annular shape, and a guide portion that abuts on a link fitted to the pin insertion portion to prevent the pin from falling down It is characterized by having.

  The pin assembly jig is manufactured using carbon tool steel or alloy tool steel.

  The pin insertion portion may be composed of pin insertion holes arranged at predetermined intervals, and may be an annular groove in which these pin insertion holes are continuous. The former is more preferable from the viewpoint of preventing the pin from falling inside.

  The pin insertion part may be such that only the pin end part can be inserted (in this case, all the assembly is performed only by the pin assembly jig of the present invention), and half the pin length is inserted. (In this case, the pin assembly jig of the present invention is used to insert approximately half of the links into the pins, and the pin assembly jig for inserting the remaining approximately half of the links. Is prepared separately). The latter is more preferable from the viewpoint of preventing the pin from falling inside.

  The guide portion is, for example, cylindrical, and has an outer diameter equal to the inner diameter of the chain (the diameter in contact with the inner periphery of the link). More preferably, the guide portion has a truncated cone shape whose outer peripheral surface is slightly inclined from the circumferential surface. In this case, the inclination angle of the outer peripheral surface with respect to the circumferential surface is preferably less than 3 ° (more preferably less than 1 °).

  In this pin assembly jig, a required number of pins are arranged in a predetermined pitch and held in an arrayed state when assembled as a chain. Then, the links held by the pressing jig are sequentially press-fitted into these pins. As the number of links to be press-fitted increases, a force acts to incline the pin inward, but the pin is maintained in the initial state (for example, vertical) by the guide portion, so when the link is press-fitted Is prevented from being displaced.

  The above-described pin assembly jig is suitable for manufacturing various power transmission chains that require press-fitting, but a plurality of links having front and rear insertion portions through which the pins are inserted, and a 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 this way, the links can be bent in the chain length direction by rolling and moving, 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 chain length direction of the insertion portion.

  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.

  The method for manufacturing a power transmission chain using this pin assembly jig includes, for example, a pin holding step for holding a required number of pins arranged at a predetermined pitch and holding them in an arrayed state when assembled as a chain, A first press-fitting step of sequentially press-fitting approximately half of the required number of links arranged in the chain width direction from the longitudinal center to one end, and one end and the other end of all pins in a state in which approximately half of the links are press-fitted And a second press-fitting step for sequentially press-fitting the remaining half of the required number of links arranged in the chain width direction from the longitudinal center to the other end of all the reversed pins. In the pin holding step, the above-described pin assembly jig is used. In the pin holding process and the pin reversing process, the pins are supported vertically or horizontally. The press-fitting of the links may be performed using a press machine, may be performed one by one, or may be performed by a plurality, or all the links arranged in the chain width direction may be press-fitted at the same time.

  According to the assembly jig for the power transmission chain pin of the present invention, the guide portion prevents the pin from falling to the inside, and the pin is maintained in the initial state. Assembly accuracy is improved.

  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 using a power transmission chain pin assembly jig 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 pins) that link the links (11) arranged in the chain width direction so as to be bent in the chain 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 pin (14) and the interpiece (15) are relatively rolled and brought into contact with each other, whereby the links (11) can be bent in the chain 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.

  The power transmission chain (1) is used in the CVT shown in FIG. 8, and at this time, as shown in FIG. 7, 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) 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.

  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.

  As shown in FIG. 3, the press-fitting device (40) used for manufacturing the power transmission chain (1) has a required number of pins (14) and about half of the interpiece (15) that can be inserted in the longitudinal direction. The disc-shaped first pin assembly jig (41) having the pin insertion holes (42) and the required number of pins (14) and the lower ends (14b) (15b) of the interpiece (15) can be inserted. A disk-shaped second pin assembly jig (43) having a pin insertion hole (44), and a pressing jig (45) for pushing each link (11) to a predetermined position of the pin (14) and the interpiece (15) And.

  The power transmission chain manufacturing method uses a first pin assembling jig (41) to pair all pins (14) and interpieces (15) used in the chain (1) with a predetermined pitch. A pin holding step (see FIG. 3 (a)) that holds the lower half of the assembly in the arrangement state when assembled as a chain (1), and all the pins (14) and the interpiece (15) A first press-fitting step (see FIG. 3 (a)) for sequentially press-fitting approximately half of the plurality of links (11) arranged in the chain width direction from the longitudinal center portion to the upper end portions (14b) (15b); ) The second pin assembly with all pins (14) and interpiece (15) having the upper half (14b) (15b) and the lower ends (14a) (15a) reversed, with approximately half of them being press-fitted Pin reversing process (see Fig. 3 (b)) to be placed on the jig (43) and in the longitudinal direction of all the inverted pins (14) and interpiece (15) And a second press-fitting step (see FIG. 3B) for sequentially press-fitting the remaining half of the plurality of links (11) arranged in the chain width direction from the upper part to the upper end part (14a) (15a). The

  The pin insertion hole (42) of the first pin assembling jig (41) has a bottom, and its depth is equal to approximately half the length of the pin (14) and the interpiece (15) in the longitudinal direction. The bottom surface of the pin insertion hole (42) is stepped so that the end surface of the pin (14) protrudes beyond the end surface of the interpiece (15). 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. A certain amount of clearance is provided to facilitate the operation.

  The pin insertion hole (44) of the second pin assembling jig (43) has a bottom, and its depth is the pin (14) from the outermost one of the links (11) aligned in the chain width direction. In addition, the pin (14) and the interpiece (15) each have a predetermined allowance on the bottom surface of the pin insertion hole (44). As shown in FIG. The cross-sectional shape of the pin insertion hole (44) 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. A certain amount of clearance is provided to facilitate the operation.

  The pressing jig (45) is for press-fitting the links (11) one by one, and the pressing jig (45) has a substantially rectangular plate shape whose size is slightly larger than that of the link (11). ) Is provided with a pin insertion hole (46) penetrating therethrough. The cross-sectional shape of the pin insertion hole (46) is substantially the same shape as the front and rear insertion portions (12) and (13) of the link (11), and when the pressing jig (45) is moved downward, 14) and the interpiece (15) are in contact with each other but do not interfere with each other.

  The first pin assembly jig (41) is rotatable about a vertical axis. First, all the pins (14) and interpieces (15) used in the chain (1) are inserted into their pin insertion holes. (42) is inserted. Next, the link (11) is disposed at the upper end of the pin (14) and the interpiece (15), and the pressing jig (45) is lowered, but the depth of the pin insertion hole (42) is the pin (14 ) And the length of the interpiece (15) approximately equal to half the length thereof, the link (11) that is first press-fitted is positioned approximately at the center in the chain width direction. Thereafter, the links (11) are sequentially press-fitted. The lowering amount of the pressing jig (45) is not a close contact between the first layer link (11) and the second layer link (11), but a predetermined amount of gap between the adjacent layer links (11). Is controlled to form. In this way, the portion from the substantially central portion in the longitudinal direction of the pin (14) and the interpiece (15) to the upper end portion (14b) (15b) by press-fitting using the first pin assembly jig (41). Almost half of all the links (11) are disposed in the first press-in process.

  Thereafter, the process proceeds to the pin reversing process and the second press-fitting process shown in FIG. 3 (b). In this process, first, the pins (14) and the interpiece (15) in which approximately half of the links (11) are arranged are arranged. The upper and lower ends (14b) and (15b) are inserted into the pin insertion holes (44) of the second pin assembly jig (43). Next, the link (11) is placed on the upper end (14a) (15a) of the pin (14) and the interpiece (15), and the pressing jig (45) is lowered, but the pin (14) and the interpiece Since almost half of the links (11) are already fixed to (15) by press-fitting, the first press-fitted link (11) is positioned at the approximate center in the chain width direction. Thereafter, the links (11) are sequentially press-fitted. The lowering amount of the pressing jig (45) is controlled so that a predetermined amount of gap is formed between the links (11) of the adjacent layers as in the first press-fitting step. In this way, the portion from the substantially central portion in the longitudinal direction of the pin (14) and the interpiece (15) to the upper end portion (14a) (15a) by press-fitting using the second pin assembly jig (43). The remaining links (11) are placed in the assembly, and the assembly is completed.

  In this way, the process of laminating the pin (14) and the interpiece (15) from the lower end side to the upper end side is not performed only once, but the press-fitting process is divided into two times, and the pin (14) In addition, by stacking the link (11) from the substantially central portion in the longitudinal direction of the interpiece (15), it is possible to make the allowance equal on the one end side and the other end side of the pin (14) and the interpiece (15). Can do.

  Since the pin insertion hole (42) of the first pin assembly jig (41) has a clearance between the pin (14) and the interpiece (15), the pin (14) and the interpiece (15 ) Can move to some extent within the pin insertion hole (42). On the other hand, as the number of links (11) to be press-fitted increases, the force in the direction of decreasing the diameter increases in the chain being assembled, and the pin (14) (and The interpiece (15)) tends to fall inward from the state shown by the solid line in FIG. 6 to the state shown by the two-dot chain line. Since the pressing jig (45) is configured to move downward at the initial setting position, when the pin (14) and the interpiece (15) are inclined, the front and rear insertion portions (12) (13) of the link (11) ) Will be displaced with respect to the pin (14) and the interpiece (15), making it difficult to newly insert the link (11).

  Therefore, the first pin assembling jig (pin assembling jig according to the present invention) (41) is shown in FIGS. 4 and 5 in order to prevent the pin (14) and the interpiece (15) from falling down. Such a cylindrical guide portion (47) is provided. The columnar guide portion (47) is integrally formed with the central portion of the disc-shaped main body (41a) in which a plurality of pin insertion holes (42) are annularly formed at predetermined intervals on the peripheral edge portion. The outer diameter of the guide portion (47) is equal to the inner diameter of the chain (1) (the diameter in contact with the inner periphery of the link (11)). The outer peripheral surface (47a) of the guide portion (47) is slightly inclined with respect to the circumferential surface (that is, the guide portion (47) is strictly shaped like a truncated cone). The inclination angle θ of the outer circumferential surface (47a) with respect to the circumferential surface is less than 1 °.

  According to this pin assembling jig (41), the guide part (47) prevents the pin (14) and the interpiece (15) from falling inside by contacting the inner periphery of the link (11). Thus, the pin (14) and the interpiece (15) are maintained in the initial state shown by the solid line in FIG. As a result, positional displacement of the pin (14) and the interpiece (15) with respect to the link (11) held by the pressing jig (45) is prevented, efficient assembly is performed, and assembly accuracy is also improved.

  The above-mentioned pin assembly jig is not limited to the shape 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 an embodiment of a power transmission chain manufactured using a power transmission chain pin assembly jig according to the present invention. FIG. 2 is an enlarged side view of the link. FIG. 3 is a vertical cross-sectional view showing a method for manufacturing a power transmission chain and a press-fitting device. FIG. 4 is a plan view of a power transmission chain pin assembly jig according to the present invention. FIG. 5 is a vertical sectional view of the same. FIG. 6 is a diagram for explaining problems of a conventional assembly jig for a power transmission chain pin. FIG. 7 is a front view showing a state in which the power transmission chain is attached to the pulley. FIG. 8 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) First pin assembly jig (pin assembly jig according to the present invention)
(41a) Body
(42) Pin insertion hole
(47) Guide section

Claims (1)

A pin assembly jig used in 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 power transmission comprising: a body in which a pin insertion portion into which a pin is inserted is formed in an annular shape; and a guide portion that abuts on a link fitted to the pin insertion portion to prevent the pin from falling down Chain pin assembly jig.

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