JP2011200898A - Method of manufacturing power transmission chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a power transmission chain which can reduce the loss of the bowstring vibration in a chain and the loss of rotation torque even if there is variation in the thickness of each link.SOLUTION: The method of manufacturing a power transmission chain includes: a step of press-fitting a link into each pin in such a manner that the gap between links arranged in the width direction of a chain is made larger than a proper value to assemble the chain; a step of applying pretension to the assembled chain; and a step of increasingly pressing the outermost side link in such a manner that the gap between the links arranged in the width direction of the chain is reduced.

Description

  The present invention relates to a method for manufacturing a power transmission chain, 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.

  As shown in FIG. 11, the automatic transmission for an automobile has a fixed sheave (2a) having a conical sheave surface and a movable sheave (2b) having a conical sheave surface, and is provided on the engine side. Drive pulley (2), driven sheave (3) provided on the drive wheel side with fixed sheave (3b) and movable sheave (3a), and endless power transmission chain (1) spanned between them The movable sheave (2b) (3a) is moved toward and away from the fixed sheave (2a) (3b) by a hydraulic actuator, and the chain (1) is clamped and brought into contact with the hydraulic sheave. A transmission (chain type continuously variable transmission) that transmits torque by the frictional force 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. 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

  In this type of power transmission chain, when there is no gap between adjacent links in the chain width direction, the gap is usually set because the link is likely to wear due to frictional force due to contact between the links. However, if this gap is increased, the frictional force that acts as a deterrent in the event of string vibration of the chain is lost, and the problem of increased vibration and noise is likely to occur. A gap is set. And in chain manufacturing, the appropriate gap between links was set so as to achieve the optimum rotational torque, and the links were press-fitted in accordance with this appropriate gap. There is a gap in the gap between them, which may cause a problem of string vibration of the chain and loss of rotational torque.

  An object of the present invention is to provide a method for manufacturing a power transmission chain that can reduce the loss of string vibration and rotational torque of the chain even if the thickness of each link varies.

  The method of manufacturing a power transmission chain according to the present invention is a method of manufacturing a power transmission chain that has a plurality of links and a plurality of pins that connect links arranged in the chain width direction, and each link is fixed to the pin by press-fitting. A step of assembling the chain by press-fitting the link into each pin so that a gap between the links arranged in the chain width direction is larger than an appropriate value, a step of applying pretension to the assembled chain, and a direction of the chain width A step of increasing and pushing the outermost link so that a gap between the links arranged in a row is reduced.

  The link has a front and rear insertion portion through which the pin is inserted, and the links are overlapped so that a front insertion portion of one link corresponds to a rear insertion portion of another link. The gap between links refers to the gap between one link and another link in a state where the links are overlapped so that the front insertion part of one link corresponds to the rear insertion part of another link. .

  The appropriate value of the gap between the links is a gap in which both the chain noise and the rotational torque loss are relatively small, for example, those within a range of less than 1 to 10 μm, preferably less than 5 to 10 μm. The thing of the range of this shall be said.

  The press-fitting device used in the step of assembling the chain includes a disk-shaped holding jig having a required number of pin insertion holes into which one end of the pin can be inserted, and a pressing jig for pushing each link to a predetermined position of the pin. The device used in the step of further pushing is provided with a disk-shaped holding jig having a required number of pin insertion holes into which one end of the pin can be inserted, and an outermost link at a predetermined position of the pin. And a pressing jig that pushes in to the top. The device used in the step of repressing may be the same device as the press-fitting device used in the step of assembling the chain, or may be a different device.

  The steps of assembling the chain and applying pretension to the chain are conventional, and after these steps, an additional pushing step is added. Conventionally, in the step of assembling the chain, an appropriate value of the gap between the links arranged in the chain width direction is set, and the links are sequentially pressed into the pins so that the gap between the links becomes this value. On the other hand, in the power transmission chain manufacturing method of the present invention, in the step of assembling the chain, the gap between the links arranged in the chain width direction is set to be larger than an appropriate value, and the outermost link is increased in the step of further pushing. By pushing and increasing, the gap between the links arranged in the chain width direction is adjusted to an appropriate value.

  When the outermost link is further pushed, pressure is applied to the second link from the outside superimposed on this link, and this link is pushed further. When the second link is pushed further, pressure is applied to the third link from the outside superimposed on the link, and the third link is pushed further. In this way, the links are sequentially pushed and pushed, so that the gap between the links becomes an appropriate value.

  If there is no gap between adjacent links in the width direction of the chain, the power transmission chain is likely to wear due to the frictional force caused by the contact between the links. Since the noise is reduced, the noise is reduced. On the other hand, if there is a large gap between adjacent links in the chain width direction, there will be no frictional force acting as a deterrent when string vibration of the chain occurs, so the loss of rotational torque will be reduced. Vibration and noise increase.

  Therefore, in order to set both the string vibration amount and the rotational torque to appropriate values, it is necessary to keep the gap between the links arranged in the chain width direction within a narrow range. In the assembled chain, the gap between the links is large due to link thickness variation, press-fit accuracy, etc., but by setting an appropriate additional push amount for each chain, the chain after the increased push The variation in the gap between the links can be suppressed, and the gap between the links where both the string vibration amount and the rotational torque have appropriate values can be obtained. That is, the link is pressed into the pin in advance so that the gap between the links is larger than an appropriate value, for example, a gap of 10 μm or more, and pretension is applied to the chain in this state. After pre-tensioning, for example, measure the distance from the outermost link on one end side to the outermost link on the other end side in the chain width direction, and based on that distance, the gap between the links generates an appropriate friction force The outermost link in the chain width direction is increased and pushed so that a proper gap is obtained. When the difference between the measured distance and the optimum distance for driving the chain is large, the amount of additional pushing of the outermost link is made relatively large, and the difference between the measured distance and the optimum distance for driving the chain is small The amount of additional pressing of the outermost link is made relatively small. In this manner, each link can be increased and pushed to set the gap between the links to an appropriate value. Thereby, both the string vibration of the chain and the loss of the rotational torque can be reduced.

  In the method of manufacturing a power transmission chain according to claim 2, in the invention according to claim 1, the step of further pressing is performed such that the outermost links on both sides of the chain width direction are simultaneously performed so that the protruding amount of both ends of the pin becomes a predetermined value. This step is a step of further pressing.

  The allowance refers to the length from the outermost link to the protruding pin end. The specified allowance is a value where the gap between the links is appropriate and the allowance on both sides in the chain width direction is equal. And

  In the present invention, a link is press-fitted into a pin in advance so that a gap between links is larger than an appropriate value, for example, a gap of 10 μm or more, and a pretension is applied to the chain in this state. After pre-tension is applied, the outermost links on both sides in the chain width direction are simultaneously increased and pushed so that the allowance of the pin becomes an appropriate value.

  In this way, since the deviation of the length of the protrusion can be reduced between the one end portion and the other end portion of the pin, the loss of the string vibration of the chain and the rotational torque can be further reduced.

  According to a third aspect of the present invention, in the power transmission chain manufacturing method according to the first aspect of the present invention, the step of further pushing increases the outermost link on the one end portion side of the pin so that the protruding amount of the one end portion of the pin becomes a predetermined value. And a step of increasing and pressing the outermost link on the other end side of the pin so that the protruding amount of the other end portion of the pin becomes a predetermined value.

  As with the invention of claim 2, the predetermined value of the allowance is set to a value such that the gap between the links is appropriate and the allowances on both sides in the chain width direction are equal.

  After the protrusion of one end of the pin is held by the holding jig of the press-fitting device, the outermost link is increased and pushed from the other end of the pin by the pressing jig so that the protrusion of the other end becomes an appropriate value. . Next, the one end side and the other end side are reversed and the other end is held by a holding jig. Then, the outermost link on one end side is further pushed by a pressing jig so that the allowance at one end and the allowance at the other end have the same length.

  In this way, unlike the invention of claim 2, since the allowance is set to a predetermined value for each side in the chain width direction, it becomes easy to make the length of the allowance equal at one end and the other end of the pin. It becomes easy to further reduce the loss of the string vibration and the rotational torque of the chain.

  The method for manufacturing a power transmission chain according to claim 4 further comprises the step of measuring the rotational torque of the pretensioned chain before the step of further pushing in the invention of claim 1, 2 or 3. The additional pushing amount of the outermost link in the step of further pushing is set based on the measurement result of the rotational torque of the chain to which the pretension is applied.

  For the rotational torque, a torque meter having a torque detection function is installed in the pulley, and the torque of the pulley is detected by the torque meter to measure the rotational torque of the chain.

  The present invention reduces both the string vibration of the chain and the loss of the rotational torque based on the rotational torque and the gap between the links. There is a predetermined relationship between the rotational torque and the gap between the links, and the difference between the target rotational torque and the measured rotational torque determines how much the gap amount needs to be reduced. The amount of movement of the outermost link for setting the value to an appropriate value is increased and set as the pushing amount. That is, the link is pressed into the pin in advance so that the gap between the links is larger than an appropriate gap, for example, a gap of 10 μm or more, and pretension is applied to the chain in this state. After measuring the rotational torque of the chain after pre-tensioning, based on the rotational torque, the links are increased and pushed so that the gap between the links is an appropriate gap that generates an appropriate frictional force. For example, if the difference between the measured rotational torque and the optimum rotational torque for driving the chain is large, the amount of additional pushing of the outermost link is made relatively large, and the measured rotational torque and the optimum rotational torque for driving the chain are When the difference is small, the amount of additional pressing of the outermost link is made relatively small. If it does in this way, each link will be increased and pushed, and it will become an appropriate gap between links. Thereby, it is possible to set a gap between the links that provides more optimal rotational torque, and to make the string vibration and rotational torque of the chain more accurate.

  According to a fifth aspect of the present invention, there is provided a method of manufacturing a power transmission chain according to any one of the first to fourth aspects, wherein a block gauge is used to set the protrusions on one end side and the other end side of the pin to predetermined values in the step of further pushing. It is characterized by.

  The block gauge is a rectangular parallelepiped gauge having two measurement surfaces, which is used as a reference for length, and the measurement surfaces are parallel to each other and the distance between the two measurement surfaces is finished to an arbitrary dimension. It is. This arbitrary dimension is created in various lengths by bringing a plurality of block gauges into close contact with each other. The dimension of the block gauge in the present invention is the same as the length of the allowance appropriate for driving the chain (the length in which the allowance is equal on both sides in the chain width direction while having an appropriate gap between the links).

  As the block gauge, for example, JIS B 7506 (2004) can be used.

  If this block gauge is set to the allowance of the pin and the allowance is shorter than the block gauge, the outermost link is increased and pushed so that the length of the allowance is equal to the length of the block gauge. It can be a bill. In the invention of claim 2, a block gauge is set for the allowance on both sides in the chain width direction, and the outermost link is increased and pushed so that the length of the allowance is equal. In invention of Claim 3, after setting a block gauge to the one end part to which the pin is not fixed, and making it the proper allowance, the one end part and the other end part of the pin are reversed, and the allowance of the other end part is made. On the other hand, a block gauge is set and the outermost link is increased and pushed so as to be equal to the length of the protrusion at the other end.

  By using the block gauge in this way, the position accuracy of the outermost links on both sides in the chain width direction can be improved.

  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 either 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 (hereinafter referred to as a pin). Is referred to as a “first pin” or “pin”), and the other pin is referred to as a pin that does not contact the pulley (interpiece or strip). ").

  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, but may be other steel such as bearing steel. The first pin and the second pin may have different cross-sectional shapes or the same shape. Moreover, as for a link, the front-and-rear insertion part may be an independent through-hole (link with a pillar), respectively, and the front-rear insertion part may be a single through-hole (link without a pillar). Appropriate steel such as bearing steel is used as the material of the pin.

  The pin (interpiece) is fixed to the front / rear insertion portion by, for example, fitting and fixing between the inner edge of the insertion portion and the outer peripheral surface of the pin by mechanical press-fitting, but instead of this, shrink fitting or cold fitting may be used. . A pin and an interpiece are fitted to one insertion portion so as to face each other in the length direction of the chain, and either one of them is fitted and fixed to the peripheral surface of the insertion portion of the link. The fitting and fixing is preferably performed at the edges (upper and lower edges) of the portion orthogonal to the length direction of the insertion portion. After the fitting and fixing, a pre-tension is applied in the pre-tension applying step, so that an appropriate and residual compressive stress is equally applied to the pin fixing portion (pin press-fitting portion) of the link.

  For example, the first pin and the second pin are formed in a required curved surface so that one of the rolling contact surfaces is a flat surface and the other rolling contact surface is relatively rolling and movable. Moreover, you may make it a rolling contact surface form a required curved surface for the 1st pin and the 2nd pin. In any case, two types of rolling contact surface shapes of each pin (for example, those having a relatively large curvature and those having a relatively small curvature) are formed, so that the locus of the rolling contact movement is different. There may be two types of pin pairs. The locus of the contact position between the first pin and the second pin is, for example, an involute curve.

  In the above power transmission chain, one of the pins (interpiece) is shorter than the other pin (pin), the end surface of the longer pin contacts the conical sheave surface of the pulley of the continuously variable transmission, It is preferable that power is transmitted by the frictional force due to this contact. Each pulley includes a fixed sheave having a conical sheave surface and a movable sheave having a conical sheave surface facing the sheave surface of the fixed sheave. The chain is sandwiched between the sheave surfaces of both sheaves, and the movable sheave. By moving the shaft with a hydraulic actuator, the wrapping radius of the chain changes according to the distance between sheave surfaces of the continuously variable transmission, and a continuously variable transmission can be performed with smooth movement.

  According to the power transmission chain manufacturing method of the first aspect of the present invention, even if the thickness of each link varies, the gap between the links can be set to an appropriate value. Both can be reduced.

  According to the method for manufacturing a power transmission chain of the invention of claim 2, since the allowance of the pin is increased and pushed simultaneously from both sides in the chain width direction, the deviation of the allowance length between the one end portion and the other end portion of the pin is increased. The increase in size is suppressed, and the loss of string vibration and rotational torque of the chain can be further reduced.

  According to the method for manufacturing a power transmission chain of the invention of claim 3, since the link is sequentially increased and pushed one by one in the chain width direction, the length of the protruding portion can be made the same at one end and the other end of the pin. It becomes easy, and it becomes easy to further reduce the loss of string vibration and rotational torque of the chain.

  According to the power transmission chain manufacturing method of the invention of claim 4, since the outermost link in the chain width direction is further pushed based on the rotational torque of the chain after pretensioning, the string vibration and rotational torque of the chain are more accurately determined. It can be

  According to the power transmission chain manufacturing method of the invention of claim 5, since the allowance is set using the block gauge, the outermost portion for equalizing the length of the allowance at one end and the other end of the pin The link position accuracy can be improved.

FIG. 1 is a plan view showing a part of an embodiment of a power transmission chain according to the present invention. FIG. 2 is an enlarged side view of the link. FIG. 3 is a vertical sectional view showing a state in which a link is press-fitted in the method of manufacturing a power transmission chain according to the present invention. FIG. 4 is a vertical sectional view showing a part of the first embodiment of the method of manufacturing the power transmission chain according to the present invention. FIG. 5 is a flowchart of the first embodiment showing the steps of the method for manufacturing a power transmission chain according to the present invention. FIG. 6 is a graph showing the noise of the power transmission chain and the loss of rotational torque due to the gap between the links. FIG. 7 is a schematic side view of the continuously variable transmission and shows a state in which torque is detected. FIG. 8 is a front view showing a state in which the power transmission chain is attached to the pulley. FIG. 9 is a vertical sectional view showing a part of the second embodiment of the method of manufacturing the power transmission chain according to the present invention. FIG. 10 is a flowchart of the second embodiment showing the steps of the method for manufacturing a power transmission chain according to the present invention. FIG. 11 is a perspective view showing a continuously variable transmission.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the left in FIG. 2 is the front and the right is the rear.

  FIG. 1 shows a part of a power transmission chain (1) manufactured by using the method of manufacturing a power transmission chain according to the present invention. The power transmission chain (1) is a predetermined interval in the length direction of the chain. A plurality of links (11) having front and rear insertion portions (12) and (13) provided at the front, a front insertion portion (12) of one link (11), and a rear insertion portion of another link (11) ( 13) and a plurality of first pins (pins) (14) and a plurality of second pins (interpieces) (15) arranged before and after connecting the links (11) arranged in the chain width direction so as to correspond to each other. In addition, the first pin (14) and the second pin (15) are relatively in rolling contact with each other, whereby the links (11) can be bent in the length direction. The interpiece (15) is made shorter than the pin (14), and the two (14) and (15) are opposed to each other with the pin (14) on the front side and the interpiece (15) on the rear side. ing.

  The chain (1) is a link unit consisting of a plurality of link rows composed of a plurality of links (11) having the same phase in the width direction as a link unit by arranging three link rows in the traveling direction (front-rear direction). Are connected in the traveling direction. In this embodiment, a link row having nine links (11) and two link rows having eight links (11) are used as one link unit.

  As shown in FIG. 2, the front insertion portion (12) includes a pin fixing portion (18) to which the pin (14) is fixed and an interpiece movable portion (19) to which the interpiece (15) is movably fitted. Thus, the rear insertion portion (13) includes a pin movable portion (16) to which the pin (14) is movably fitted and an interpiece fixing portion (17) to which the interpiece (15) is fixed.

  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) (15b) ) Is provided.

  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, the pin (14) is fixed to the front insertion part (12) of one link (11) and is movably fitted to the rear insertion part (13) of the other link (11), The interpiece (15) is movably fitted to the front insertion part (12) of one link (11) and fixed to the rear insertion part (13) 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.

  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 rolling contact surface (14a) of the pin (14) is The cross section has an involute shape having a base circle of radius Rb and center M, and the rolling contact surface (15c) 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 part of the chain (1) to the arc part or from the arc part to the straight part, the interpiece (15) is movable in the front insertion part (12). The rolling contact surface (15c) moves to the rolling contact surface (14a) of the pin (14) while making rolling contact (including some sliding contact) with respect to the pin (14) in the fixed state in the part (19). In the rear insertion portion (13), the rolling contact surface (14a) is in rolling contact with the rolling contact surface (15c) of the interpiece (15) with respect to the interpiece (15) in which the pin (14) is fixed ( It moves in the pin movable part (16) while including a slight sliding contact.

  FIG. 3 shows a state in which the links (11) and (21) are press-fitted using the press-fitting device (40) used in the method of manufacturing the power transmission chain (1) according to the present invention. In the following description, the top and bottom refer to the top and bottom of this figure, but this is for convenience and the left and right of FIG. 3 may be up and down.

  The press-fitting device (40) includes a pin-shaped holding jig (43) having a required number of pin insertion holes (44) into which one end (14d) (15d) of the pin (14) and the interpiece (15) can be inserted. And a pressing jig (45) for pressing each link (11) (21) to a predetermined position of the pin (14) and the interpiece (15).

  The pin insertion hole (44) of the holding jig (43) has a bottom, and the bottom surface of the holding jig (43) is stepped so that the end surface of the pin (14) protrudes beyond the end surface of the interpiece (15). Yes. 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. The fitting is such that the inserted pin (14) and the interpiece (15) are movable.

  The pressing jig (45) is for press-fitting the links (11) and (21) one by one, and has a substantially rectangular plate shape whose size is slightly larger than that of the links (11) and (21). . The pressing jig (45) 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 holding jig (43) is rotatable around the vertical axis.First, all the pins (14) used in the chain (1) and one end (14d) (15d) of the interpiece (15) Is inserted and held in the pin insertion hole (44). Next, when the link (11) is press-fitted into the pin (14) and the interpiece (15), the link (21) is inserted into the other end (14e) (15e) of the pin (14) and the interpiece (15). Once placed, the pressing jig (45) is lowered. The lowering amount of the pressing jig (45) is not between the first link (11) and the second link (11), but between the adjacent links (11) (21). The gap is controlled so as to be formed with a gap larger than the gap. In this embodiment, the link is press-fitted with a gap of 10 μm or more. In this way, the links (11) and (21) are manufactured by being press-fitted sequentially. 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.

  In the above chain (1), the number of links (11) and (21) at the time of press-fitting is one link unit because the link row with nine links and two link rows with eight links are one link unit. Are 25 steps in total, and the links (11), (21) in all 25 steps are arranged in the portion from the lower end side to the upper end side in the longitudinal direction of the pin (14) and the interpiece (15), and the press-fitting process is completed .

  In this way, the pin (14) and the interpiece (15) are fixedly fitted and fixed by mechanical press-fitting, and after the fitting and fixing, pre-tension is applied in the pre-tension applying step. (11) The pin fixing portion (18) and the interpiece fixing portion (17) of (21) are evenly and appropriately applied with residual compressive stress.

  Next, the rotational torque of the power transmission chain (1) is measured. The measurement of the rotational torque is to measure the torque required for rotationally driving the power transmission chain (1). As shown in FIG. 7, the shafts (2c) (3c) of the pulleys (2) (3) are measured. The torque meter (50) of the detection device (49) equipped with a torque detection function is installed on the shaft, and the chain (1) is rotated based on the torque of the pulley (2) (3) detected by the torque meter (50). Measure the rotational torque being driven. Then, based on the measured rotational torque, the amount by which the outermost link (21) is increased and pushed is calculated so that both ends (14d) and (14e) of the pin (14) have an appropriate margin.

  Appropriate allowance shall have a gap between the appropriate links (11) and (21), and the allowance of the one end (14d) and the other end (14e) should be equal. .

  The gap between the appropriate links (11) and (21) is a gap where both the noise of the chain (1) and the loss of the rotational torque are reduced. In this embodiment, the gap is 5 to 10 μm.

  FIG. 4 shows a first embodiment in which the outermost link (21) in the method of manufacturing the power transmission chain (1) of the present invention is simultaneously pushed from above and below.

  As shown in FIG. 4, the two block gauges (51) are respectively set to the allowance of one end portion (14d) and the allowance of the other end portion (14e), and the outermost link (21) in the chain width direction is set upward. By pushing and pushing the outermost link (21) from the bottom at the same time, the proper allowance is obtained. The dimension of the block gauge (51) is set to a length equal to the appropriate length of the allowance.

  FIG. 5 shows a flowchart of the first embodiment in the method of manufacturing the power transmission chain (1) according to the present invention.

  As shown in FIG. 5, the power transmission chain (1) is manufactured by connecting the links (11) and (21) to the pins (14) and the links (11) and (21) so that the gap between the links (11) and (21) is larger than the appropriate gap. The step of press-fitting the interpiece (15) to assemble the chain (1), the step of applying pretension to the chain (1), the step of measuring the rotational torque of the chain (1), and the measured rotational torque A step of calculating the additional push amount of the outer link (21), a step of setting a block gauge (51) at the protruding amount of the one end (14d) and the protruding amount of the other end (14e), and measurement of the rotational torque Based on the result, the outermost link (21) in the chain width direction is simultaneously pushed from both outer sides to push the pin (14) properly.

  As shown in FIG. 6, when the power transmission chain (1) has no gap between adjacent ones of the links (11) and (21) aligned in the chain width direction, the contact between the links (11) and (21) Since the links (11) and (21) are likely to wear due to the frictional force caused by the above, the loss of rotational torque (loss torque) is increased, but the noise is reduced because the string vibration is reduced. On the other hand, if there is a large gap between adjacent ones of the links (11) and (21) aligned in the chain width direction, there will be no frictional force that acts as a deterrent when the string vibration of the chain (1) occurs. Torque loss (loss torque) is reduced, but string vibration and noise increase.

  Therefore, the present invention has an appropriate gap within a range of 5 to 10 μm so that the outermost link (21) is further pushed to generate a necessary frictional force between the links (11) and (21). Both the string vibration and the rotational torque loss of the chain (1) can be reduced. Further, by setting the block gauge (51) as the allowance, the positional accuracy of the outermost links (21) on both sides in the chain width direction can be improved.

  In addition, the outermost link (21) is further pushed based on the measured rotational torque to reduce the difference in length between the allowance of one end (14d) and the allowance of the other end (14e). The loss of string vibration and rotational torque of the chain (1) can be further reduced and made more accurate.

  In FIG. 8, when the movable sheave (2b) of the drive pulley (2) located 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, 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.

  FIG. 9 shows a second embodiment in which the outermost link (21) in the method for manufacturing the power transmission chain (1) of the present invention is pushed one by one.

  As in the first embodiment, the chain (11) (21) is connected to the pin (11) (21) so that the gap between the adjacent links (11) (21) is formed with a larger gap than the appropriate gap. After being press-fitted into 14) and the interpiece (15), an even and appropriate residual compressive stress is applied to the pin fixing portions (18) and the interpiece fixing portions (17) of the links (11) and (21). Next, the rotational torque of the power transmission chain (1) is measured. Rotational torque is measured by measuring the torque required to drive the power transmission chain (1). As shown in FIG. 7, the pulleys (2) and (3) have a torque detection function. Install the torque meter (50) of the device (49), and measure the rotational torque driving the chain (1) based on the torque of the pulley (2) (3) detected by the torque meter (50) To do. Thereafter, the additional pushing amount of the outermost link (21) is calculated from the measured rotational torque.

  Next, unlike the first embodiment, the pin (14) and one end (14d) (15d) of the interpiece (15) are held by the holding jig (43), and the other end (14e) of the pin (14) is held. ) Set two block gauges (51), push the outermost link (21) on the other end side further and push the other end (14e) to the proper margin, as shown in FIG. One end side and the other end side are reversed (upside down), and the other end portions (14e) and (15e) are held by the holding jig (43). Thereafter, the two block gauges (51) are set to the allowance of one end (14d), and the allowance of one end (14d) and the allowance of the other end (14e) are equal in length. The outermost link (21) on one end side is further pushed from above by the pressing jig (45). The dimension of the block gauge (51) is set to a length equal to the appropriate length of the allowance.

  As in the first embodiment, the appropriate allowance has a gap between the appropriate links (11) and (21), and the allowance between the one end (14d) and the other end (14e). Are of equal length. The gap between the appropriate links (11) and (21) is a gap in which both the noise of the chain (1) and the loss of rotational torque are reduced. In this embodiment, the gap is 5 to 10 μm.

  FIG. 10 shows a flow chart of a method of manufacturing the power transmission chain (1) according to the present invention.

  As shown in FIG. 10, the power transmission chain (1) is manufactured by connecting the links (11) and (21) to the pins (14) and the links (11) and (21) so that the gap between the links (11) and (21) is larger than the appropriate gap. The step of press-fitting the interpiece (15) to assemble the chain (1), the step of applying pretension to the chain (1), the step of measuring the rotational torque of the chain (1), and the measured rotational torque A step of calculating an amount to push the outer link (21), a step of maintaining the protrusion of the pin (14) and one end (14d) of the interpiece (15) in the chain width direction, and a block gauge (51) Set the outermost link (21) on the other end side of the pin (14) and push it to make the proper allowance, and the other end with the one end side and the other end side in the chain width direction reversed Step (14e) (15e) holding step, and setting a block gauge to set the outermost It is assumed to include a step of pushing increasing click.

  The present invention has an appropriate clearance within a range of 5 to 10 μm so that the outermost link (21) is further pushed to generate a necessary frictional force between the links (11) and (21). It is possible to reduce both the string vibration and rotational torque loss of (1). Further, by setting the block gauge (51) as the allowance, the positional accuracy of the outermost links (21) on both sides in the chain width direction can be improved.

  In addition, since the outermost link (21) is further increased and pushed one by one in the chain width direction, it becomes easy to make the length of the projection of the one end (14d) and the projection of the other end (14e) the same, Further, since the outermost link (21) is further pushed based on the measured rotational torque, the string vibration of the chain (1) and the loss of the rotational torque can be further reduced and made more accurate.

  In the chain type power transmission chain (1), polygonal vibration is generated by repeated vertical movement of the pin (14), which causes noise, but the pin (14) and the interpiece (15) are relatively Since the locus of the contact position between the pin (14) and the interpiece (15) relative to the pin (14) is an involute curve, the pin (14) and the interpiece (15 Compared with the case where both of the contact surfaces are arc surfaces, vibration can be reduced and noise can be reduced.

(1) Power transmission chain
(11) (21) Link
(14) Pin (1st pin)
(15) Interpiece (2nd pin)
(14d) (15d) One end
(14e) (15e) The other end
(51) Block gauge

Claims (5)

A method of manufacturing a power transmission chain having a plurality of links and a plurality of pins for connecting the links arranged in the chain width direction, and each link being fixed to the pins by press fitting,
Assembling the chain by press-fitting the link into each pin so that the gap between the links aligned in the chain width direction is larger than the appropriate value, applying pretension to the assembled chain, and aligning in the chain width direction And a step of increasing and pushing the outermost link so that a gap between the links is reduced.   The step of further pushing is a step of simultaneously pushing and pushing the outermost links on both sides in the chain width direction so that the protruding amount of both ends of the pin becomes a predetermined value. Production method.   The step of pushing further increases the step of pushing the outermost link on one end of the pin so that the allowance of one end of the pin becomes a predetermined value, and the allowance of the other end of the pin becomes a predetermined value. 2. The method of manufacturing a power transmission chain according to claim 1, further comprising the step of further pushing the outermost link on the other end side of the pin.   A step of measuring the rotational torque of the pre-tensioned chain is further provided before the step of additional pushing, and the amount of additional pushing of the outermost link in the step of additional pushing is determined by the amount of the pre-tensioned chain. 4. The method of manufacturing a power transmission chain according to claim 1, wherein the power transmission chain is set based on a measurement result of rotational torque.   5. The method of manufacturing a power transmission chain according to claim 1, wherein, in the step of further pushing, a block gauge is used in which the allowance on one end side and the other end side of the pin is set to a predetermined value.

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