JP2006116563A - Manufacturing method for power transmission chain, and manufacturing device for power transmission chain used for the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a power transmission chain which can easily be assembled. <P>SOLUTION: According to the power transmission chain manufacturing method, a plurality of link plates 2 are laminatedly arranged while inserting dummy pins 6 in pin holes 2a so as to be held as a chain 1 in a temporarily assembled state, thereby the link plates 2 can be positioned while the pin holes 2a of the laminated link plates 2 are accurately matched with each other. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a power transmission chain used in a chain type continuously variable transmission or the like employed in a vehicle or the like, and a power transmission chain manufacturing apparatus used therefor.

  2. Description of the Related Art Conventionally, as a power transmission chain used in an automobile chain type continuously variable transmission or the like, a plurality of link plates in which two pin holes are formed at a predetermined pitch, and a plurality of pins for connecting these in a bendable manner Some have a member. In such a power transmission chain, link plates are laminated in the thickness direction and the longitudinal direction, and are connected endlessly by press-fitting a pin member into the pin hole (see, for example, Patent Document 1).

JP-A-8-312725 (page 4)

In the power transmission chain as described above, the link plates are laminated so that the respective pin holes are aligned, and the pin member made of two pins is press-fitted into the pin hole and the chain is moved in the width direction. It is inserted so as to penetrate through. A chain having such a structure can hardly be bent in directions other than the direction around the axis of the pin member, and play such as rattling is very little. Therefore, when assembling the power transmission chain, the longitudinal direction of the pin member is maintained substantially perpendicular to the side surface of the link plate, and the pitch interval between the adjacent pin members is accurately maintained at a predetermined interval. If the member is not positioned accurately and press-fitted into the link plate, the pin member may not fit into the pin hole, or galling may occur between the pin member and the pin hole, and the pin can be press-fitted into the pin hole. There wasn't.
For this reason, when the pin member is press-fitted into the link plate, it is necessary to accurately maintain the positional relationship so that it can be assembled as the chain. This positioning makes the chain assembly operation difficult. It was.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method of manufacturing a power transmission chain capable of accurately positioning a link plate and easily assembling it.

  The present invention provides a power transmission comprising a plurality of link plates that have pin holes and are stacked in the thickness direction, and a plurality of pin members that are inserted into the pin holes and connect the plurality of link plates. A method for manufacturing a chain, wherein a dummy pin that can be inserted into and removed from the pin hole is inserted into the pin hole, and the plurality of link plates are stacked and temporarily assembled as the power transmission chain, and thereafter The pin member is inserted into the pin hole in place of the dummy pin inserted into the pin hole.

  According to the method of manufacturing a power transmission chain configured as described above, the plurality of link plates are stacked and arranged while the dummy pins are inserted into the pin holes so that the power transmission chain is temporarily assembled. Since it can hold | maintain, the said link plate can be positioned, making the pin hole of the said link plate laminated | stacked exactly correspond. Accordingly, the pin member can be reliably inserted into the pin hole of the link plate.

  In addition, the present invention includes a plurality of link plates that have pin holes and are stacked in the thickness direction, and a plurality of pin members that are inserted into the pin holes and connect the plurality of link plates. An apparatus for manufacturing a power transmission chain, wherein a plurality of dummy pins that can be inserted into and removed from the pin holes, and the plurality of dummy pins are extracted in the same state as the arrangement of the pin members when assembled as the power transmission chain. And dummy pin holding means for holding the arrangement in an insertable manner.

  According to the power transmission chain manufacturing apparatus configured as described above, since the link plate can be temporarily assembled by the above-described power transmission chain manufacturing method, the pin holes of the stacked link plates can be accurately matched. The link plate can be positioned. Furthermore, since the dummy pin is detachably held by the dummy pin holding means, the dummy pin and the pin member can be replaced in a temporarily assembled state. Accordingly, the pin member can be reliably inserted into the pin hole of the link plate.

  As described above, the power transmission chain manufacturing method according to the present invention can maintain the state where the link plate is accurately positioned and can reliably insert the pin member into the pin hole of the link plate. Easy assembly of the chain.

  Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view schematically showing a main configuration of a chain for a so-called chain-type continuously variable transmission (hereinafter also simply referred to as “chain”), which is an example of a power transmission chain manufactured according to the present invention. . The chain 1 is composed of a plurality of metal (carbon steel or the like) link plates 2 and a plurality of metal (bearing steel or the like) pin members P for connecting the link plates 2 to each other. It is said that. In FIG. 1, the description of the central portion in the width direction of the chain 1 is partially omitted.

The link plate 2 is shaped so that the outer shape of the link plate has a gentle curved shape and all have substantially the same outer shape, and is provided with a first pin hole 2a1 and a second pin hole 2a2. The first pin hole 2a1 and the second pin hole 2a2 are also collectively referred to as the pin hole 2a. The link plates 2 are stacked in the thickness direction as shown in the figure. In the link plates 2 arranged adjacent to each other, the first pin holes 2a of one link plate 2 and the other link plate 2 are arranged. The side surface 2b of the link plate 2 is shifted in the longitudinal direction of the chain so as to overlap with the position of the second pin hole 2a and stacked in the thickness direction.
The pin member P for connecting the link plate 2 includes a pin 3 that is a rod-like body having an outer peripheral surface 3a along the inner peripheral surface of the pin hole 2a, an inner peripheral surface of the pin hole 2a that is formed slightly shorter than the pin 3 , And a strip 4 that is a rod-like body having an outer peripheral surface 4a. The pins 3 and the strips 4 are inserted into the pin holes 2a of the link plate 2 arranged in a stacked manner as described above, and the plurality of link plates 2 are connected so as to be bent.

Next, the manufacturing apparatus of the said chain 1 which concerns on one Embodiment of the manufacturing apparatus of the power transmission chain which is this invention is demonstrated in detail. FIG. 2 is a schematic diagram showing a chain 1 manufacturing apparatus and a method of manufacturing the chain 1 using the same.
As shown in FIG. 2A, the chain 1 manufacturing apparatus S includes a plurality of dummy pins 6 that are inserted into the pin holes 2 a instead of the plurality of pins 3 and strips 4 and temporarily assemble the link plate 2 as the chain 1. The assembly mold 5 that holds the dummy pins 6 and the upper mold 7 that is disposed above the assembly mold 5 and temporarily holds the link plate 2 are provided.

The dummy pin 6 is formed into a rod shape using carbon tool steel, alloy tool steel, or the like, and protrudes perpendicularly to the upper surface 5b from the upper surface 5b of the assembly die 5 by substantially the same dimension as the width direction of the chain 1. It is inserted into a positioning hole 5a formed in the assembly die 5 and held so as to be able to be inserted and removed.
FIG. 3 is a perspective view of the appearance of the dummy pin 6. As shown in the drawing, the shape of the outer peripheral surface 6 a of the dummy pin 6 is a shape that follows the inner peripheral surface shape of the pin hole 2 a of the link plate 2, similarly to the pin 3 and the strip 4. The outer peripheral diameter of the outer peripheral surface 6a is preferably set to be about 60 to 100 μm thinner than the outer peripheral diameter formed when the pin 3 and the strip 4 are press-fitted into the pin hole 2a. The thickness was set to 80 μm. By setting in this way, positioning can be reliably performed when the dummy pin 6 is inserted into the pin hole 2a while being easily detachable from the pin hole 2a.

Further, as shown in the figure, a step is provided on the end face 6 b of the dummy pin 6. As will be described later, when the tip 3 is brought into contact with the end surface 6b of the dummy pin 6 to press-fit the pin 3 and the strip 4 as will be described later, the pin 3 and the strip having a difference in length in the axial direction thereof. The pin 3 and the strip 4 can be positioned with respect to the axial direction of the pin so that the positional relationship in the axial direction with the pin 4 is the same as when assembled as the chain 1.
A chamfered portion 6 c is provided at the end of the dummy pin 6. The chamfered portion 6c facilitates insertion of the dummy pins 6 into the pin holes 2a of the link plate 2 and facilitates temporary assembly of the link plate 2.

As shown in FIG. 2A, the assembly die 5 is formed by carbon tool steel, alloy tool steel, or the like so as to have an upper surface 5b that is a horizontal plane. In the upper surface 5b, a plurality of positioning holes 5a into which the dummy pins 6 are inserted are formed perpendicular to the upper surface 5b. The plurality of positioning holes 5a have the same pitch as the pitch width of the chain 1 between the adjacent positioning holes 5a, and the same number as the number of pin members P required as the chain 1 along the longitudinal direction of the assembly die 5. The dummy pins 6 are arranged in a row so that they can be held. The inner peripheral surface shape of the positioning hole 5a is formed so as to follow the outer peripheral surface shape of the dummy pin 6, and the clearance of the positioning hole 5a when the dummy pin 6 is inserted can be smoothly inserted and removed at the same time. It is set to such an extent that there is no play such as sticking.
A spring 5d is disposed in the positioning hole 5a. One end of the spring 5d is in contact with the lower end surface 6d of the dummy pin 6, and the other end is in contact with a spring seat fixed to the assembly die 5 (not shown). Thus, the dummy pin 6 is biased upward by the spring 5d and is held in a state of protruding from the upper surface 5b. And when downward force acts on the end surface 6b of the dummy pin 6, the dummy pin 6 is comprised so that it may accommodate in the positioning hole 5a.
The assembly die 5 configured in this way constitutes dummy pin holding means that holds the dummy pins 6 in the same state as the arrangement of the pin members P when the dummy pins 6 are assembled as the chain 1.

The upper die 7 is formed into a rectangular parallelepiped shape using carbon tool steel, alloy tool steel, or the like, and a plurality of through-holes 7b into which the dummy pins 6, the pins 3 and the strips 4 project from the pin holes 2a can be inserted are assembled. 5 corresponding to the positioning holes 5a. The shape of the inner peripheral surface of the through hole 7b is not limited as long as the dummy pin 6, the pin 3 and the strip 4 can be inserted. In this embodiment, the pin 3 and the strip 4 are combined and assembled as the chain 1. The shape is in conformity with the shape of the outer peripheral surface, and the shape is formed so as to coincide with the shape of the inner peripheral surface of the pin hole 2a of the link plate 2 when arranged as the chain 1. By doing in this way, the outer peripheral surface shape which the pin 3 inserted in the through-hole 7a and the strip 4 comprise can be positioned by making it correspond with the inner peripheral surface shape of the pin hole 2a, and the through-hole 7b mentioned later can be positioned. It is possible to easily press-fit the inserted pin 3 and strip 4 into the pin hole 2a.
The upper die 7 is attached to a press machine or the like (not shown) together with the assembly die 5. And these dies can be reciprocated in any range within the range that can be stroked in the vertical direction while operating parallel to each other by operating the press machine, and any It can be fixed in position.

Next, a method for manufacturing the chain 1 using the manufacturing apparatus S for the chain 1 will be described.
To assemble the chain 1, first, a plurality of link plates 2 are assembled by inserting the dummy pins 6 protruding from the upper surface 5b of the assembly die 5 as shown in FIG. 2 (a) into the pin holes 2a of the link plate 2. They are sequentially arranged on the upper surface 5 b of the mold 5.
2 (b), the dummy plate 6 is inserted into the pin hole 2a, and the link plate 2 is laminated in the longitudinal direction and the width direction according to a predetermined arrangement as the chain 1, and arranged on the upper surface 5b of the assembly die 5. Thus, the plurality of link plates 2 are arranged in the same state as the completed state of the chain 1. That is, these link plates 2 are held in a temporarily assembled state on the upper surface 5 b of the assembly die 5 so that the chain 1 can be completed only by press-fitting the pins 3 and the strips 4.

  Next, as shown in FIG. 2C, the upper die 7 disposed above the assembly die 5 is lowered, and the lower surface 7a is temporarily assembled while the end of the dummy pin 6 is inserted into the through hole 7b. Abut against plate 2 and fix. Thus, each of the arranged dummy pins 6 is reliably positioned, and the plurality of laminated link plates 2 are sandwiched between the assembly molds 5 and securely fixed.

Next, as shown in FIG. 2D, by inserting the pin 3 and the strip 4 as the pin member P into the through hole 7b of the upper die 7, and inserting the pin 3 and the strip 4 downward as they are. The pin 3 and the strip 4 are press-fitted into the pin hole 2a. At this time, the dummy pin 6 is pushed downward by the pin 3 and the strip 4 and stored in the positioning hole 5 a of the assembly die 5.
In FIG. 2 (d), states X, Y, and Z indicate changes in the positional relationship between the pin 3 and the strip 4 and the dummy pin 6 sequentially with time when the pin 3 and the strip 4 are press-fitted into the pin hole 2a. Yes. In FIG. 2D, the states X, Y, and Z are shown together on the same drawing for the sake of convenience in order to explain the positional relationship with time.

First, as shown in state X, the pin 3 and the strip 4 are inserted into the through hole 7a of the upper mold 7 using a jig or the like (not shown), and the end surface 6b of the dummy pin 6 is brought into contact with the end surface of the pin 3 and the strip 4 Let At this time, as described above, the through hole 7a positions the pin 3 and the strip 4 so that the outer peripheral surface shape thereof matches the inner peripheral surface shape of the pin hole 2a.
At the same time, due to the step provided on the end face 6b of the dummy pin 6, the axial positional relationship between the pin 3 and the strip 4 having a difference in the length in the axial direction is the same as when the chain 1 is assembled. The pin 3 and the strip 4 are positioned with respect to the axial direction.

Next, as shown in the state Y, the pins 3 and the strips 4 inserted into the through holes 7a are inserted into the pin holes 2a of the link plate 2 stacked using a press-fit die attached to a press machine (not shown). Press-in gradually from above. At the same time, the dummy pins 6 are pushed downward by the end surfaces of the pins 3 and the strips 4. And like the state Z, it press-fits to the predetermined position with respect to the link plate 2 with which the pin 3 and the strip 4 were laminated | stacked.
In the present embodiment, a jig or the like is used to insert the pin 3 and the strip 4 into the through hole 7a. However, an operator may insert the pin 3 and the strip 4 by hand. For press-fitting the pin 3 and the strip 4 into the pin hole 2a, a press-fitting die or the like is used, but an operator may press-fit using a jig or the like.

  As described above, the chain 1 is press-fitted so that the dummy pin 6 inserted into the pin hole 2a of the link plate 2 temporarily assembled on the upper surface 5b of the assembly die 5 is replaced with the pin 3 and the strip 4. Thus, the chain 1 is assembled as a single end chain. And the endless chain 1 can be obtained by connecting the both ends of this assembled ended chain 1.

  According to the manufacturing method of the chain 1 according to the present embodiment as described above, the dummy plate 6 can be held in a temporarily assembled state as the chain 1 by arranging the link plates 2 while being stacked while inserting the dummy pins 6 into the pin holes 2a. The link plate 2 can be positioned while the pin holes 2a of the link plates 2 to be laminated are accurately matched. Accordingly, the pins 3 and the strips 4 can be reliably press-fitted into the pin holes 2a of the link plate 2, and the assembly of the chain 1 can be facilitated.

In addition, the chain S manufacturing apparatus S according to the present embodiment positions the link plate 2 by temporarily assembling the link plate 2 by the above-described method, and the dummy pins 6 are held by the assembly die 5 so as to be removable. Therefore, the dummy pin 6, the pin 3, and the strip 4 can be replaced in the temporarily assembled state. Therefore, the pins 3 and the strips 4 can be reliably press-fitted into the pin holes 2a of the link plate 2, and the assembly of the chain 1 can be facilitated.
Further, in the chain 1 shown in the present embodiment in which the pins 3 and the strips 4 are inserted into the pin holes 2a of the link plate 2 in a press-fitted state, a particularly large force is required to insert and press-fit the pins, These positioning accuracy is highly required. For this reason, by assembling the chain by the method for manufacturing the chain 1 according to the above-described embodiment, the effect of reducing the assembly failure of the chain can be particularly high, and the cycle time of the assembly operation of the chain can be shortened.

  In the above embodiment, the end chain 1 is assembled to the upper surface 5b of the assembly die 5 and then both ends thereof are connected. However, the link plate 2 can be temporarily assembled as the endless chain 1. You may make it assemble as the endless chain 1 using an assembly type | mold. Further, in the present embodiment, the pins 3 and the strips 4 are press-fitted into the pin hole 2a one by one. However, a plurality of sets or a total number of the pins 3 and strips 4 may be press-fitted at the same time.

Further, the power transmission chain manufacturing method of the present invention is not limited to the above embodiment, the structure of the chain to be manufactured, the shape of the link plate, the arrangement, the configuration of the assembly mold and the upper mold, the shape, etc. It can change suitably based on the meaning of the present invention.
For example, in the above embodiment, the chain in which the pin 3 and the strip 4 are inserted into the pin hole 2a in a press-fitted state is shown, but the present invention can also be applied to a so-called loose type chain in which these are inserted without being press-fitted. The link plate 2 of the chain 1 manufactured by the above embodiment has two pin holes (first and second pin holes 2a). For example, the two pin holes are connected. The present invention can also be applied to a link plate in which one pin hole having such a shape is formed and this one pin hole substantially functions as the first and second pin holes 2a.

It is a perspective view which shows typically the principal part structure of the chain for chain type continuously variable transmissions which is an example of the power transmission chain manufactured by this invention. It is the schematic diagram which showed the apparatus of the chain which concerns on one Embodiment of this invention, and the manufacturing method using the same. It is a perspective view which shows the external appearance of a dummy pin.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power transmission chain 2 Link plate 2a Pin hole 5 Assembly type 6 Dummy pin 7 Upper mold P Pin member S Manufacturing apparatus

Claims (2)

A method of manufacturing a power transmission chain, comprising: a plurality of link plates that have pin holes and are stacked in the thickness direction; and a plurality of pin members that are inserted into the pin holes and connect the plurality of link plates. Because
A dummy pin inserted into the pin hole is temporarily assembled as the power transmission chain by stacking and arranging the plurality of link plates while inserting a dummy pin that can be inserted into and removed from the pin hole. A method for manufacturing a power transmission chain, wherein the pin member is inserted into the pin hole after being replaced with a pin. A power transmission chain manufacturing apparatus comprising: a plurality of link plates that have pin holes and are stacked in the thickness direction; and a plurality of pin members that are inserted into the pin holes and connect the plurality of link plates. Because
A plurality of dummy pins that can be inserted into and removed from the pin holes, and a dummy pin holding means that holds the plurality of dummy pins so that they can be inserted and removed in the same state as the arrangement of the pin members when assembled as the power transmission chain; A device for producing a power transmission chain, comprising:

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