JP2007111746A - Method for manufacturing friction plate, and apparatus for casting core plate in friction plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a friction plate by which the side surface of a core plate can smoothly be formed while restraining the development of warping at the casting time of the core plate and a lining can accurately be stuck on the side surface without applying machining-work and a trimming is scarcely needed. <P>SOLUTION: In the method for manufacturing the friction plate composed of the core plate 15 integrally projecting a plurality of transmission claws 15b on the inner periphery or the outer periphery of an annular core plate body 15a and the lining 16 stuck on the side surface of the core plate body 15a: this method is contained of; a casting process for forming the core plate 15 by casting raw material into a cavity 26 demarcated between a fixed metallic mold 25 and a movable metallic mold 27 corresponding to the outer shape of the core plate 15; a mold opening process for opening between both metallic molds 25, 27; a discharging process for discharging the core plate 15 by rotatively shifting a part 30 in contact with the whole body at the one side surface of the core plate 15 in the one side of the metallic mold to the other portions 28, 29; and a lining sticking process for sticking the lining 16 on the side surface of the core plate body 15a of the core plate 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a core plate formed by integrally projecting a plurality of transmission claws that are thicker than that and arranged at equal intervals in the circumferential direction on the inner periphery or outer periphery of an annular core plate main body, and the core plate The present invention relates to a method of manufacturing a friction plate including a friction material lining bonded to a side surface of a main body, and a core plate casting apparatus in the friction plate.

A core plate formed by integrally projecting a plurality of transmission claws arranged on the inner periphery or the outer periphery of the annular core plate main body and having a larger thickness than that of the ring core at equal intervals in the circumferential direction; A friction plate composed of a lining made of a friction material to be bonded is already known as disclosed in Patent Document 1 below, and the core plate of this friction plate can be manufactured by die casting. It is already known as disclosed in document 2.
Japanese Patent Laid-Open No. 11-269279 JP-A-7-98025

  Conventionally, in the case where the core plate of such a friction plate is made by die casting, the side surface of the core plate is pressed by the ejector pin in order to eject the core plate from the mold at the time of casting. The ejector pin contact mark remained as a shallow recess on the side of the plate, and the side of the core plate was cut smoothly to eliminate the recess, thereby improving the adhesion of the lining to the side. However, since the above-described cutting process requires a lot of labor and time, it is an obstacle to reducing the manufacturing cost of the friction plate.

  Therefore, in order to prevent the ejector pin from being left on the side surface of the core plate, an extra pressure receiving part is connected to the inner or outer periphery of the core plate, and the pressure receiving part is pushed out by the ejector pin. Although there is a known method of discharging the mold from the mold, in such a method, since the pressing point of the ejector pin is separated from the core plate, the extrusion of the ejector pin causes warping of the relatively thin core plate. Therefore, after casting, a process to correct the warpage is required, and a process to trim the excess pressure receiving part is also required, which is combined with the low raw material yield, which reduces the friction plate manufacturing cost. Reduction is even more difficult.

  The present invention has been made in view of such circumstances, and enables the side surface to be formed smoothly while suppressing the occurrence of warpage during the casting of the core plate, and the side surface can be formed without being cut. Friction plate manufacturing method and core plate casting apparatus for friction plate, which can accurately bond the lining to each other, and need almost no trimming, and therefore can improve the yield of raw materials and greatly contribute to the reduction of manufacturing cost. The purpose is to provide.

  In order to achieve the above object, the present invention has a plurality of transmission claws integrally projectingly provided on the inner periphery or outer periphery of an annular core plate main body, which is thicker than that and arranged at equal intervals in the circumferential direction. A friction plate made of a friction material and a lining made of a friction material bonded to a side surface of the core plate main body, and corresponding to the outer shape of the core plate so as to eliminate the need for trimming after molding. A casting process in which the core plate is formed by casting a raw material into a cavity defined between the fixed mold and the movable mold, and after the casting process, the core plate is attached to one mold. A mold opening step for opening the molds between the two molds, and after the mold opening step, a part of the one mold contacting the entire side surface of the core plate is moved relative to the other part to move the core. A discharging step for discharging the plate, and after this discharging step, the lining is bonded to the side surface of the core plate main body. To include the innings bonding step of the first aspect.

  In addition to the first feature of the present invention, the second feature is that a sand blasting process for performing a sand blasting process for making the surface of the core plate a satin finish is interposed between the discharging process and the lining bonding process. And

  Further, the present invention is a core plate casting apparatus for a friction plate according to the first feature, comprising a fixed mold and a movable mold, which are opposed to each other so as to define the cavity, and the movable mold is provided. The mold is disposed between an inner movable block forming an inner peripheral wall of the cavity, an outer movable block surrounding the inner movable block and forming an outer peripheral wall of the cavity, and between the inner and outer movable blocks, It was composed of a molding position that forms one inner wall of the cavity, and an intermediate movable block that can move between a discharge position that pushes the core plate out of the inner and outer movable blocks when the mold is opened after molding the core plate. Is the third feature.

  According to the first feature of the present invention, it is possible to obtain a core plate that is smooth on both sides and has no extra pressure-receiving portion and is free of warpage. Since post-processing is not required and the yield of raw materials is good, manufacturing costs can be greatly reduced. Further, the lining can be securely bonded to both side surfaces of the as-cast cocoon mainly composed of the core plate. Furthermore, since the entire surface of the core plate is as-cast, it is chilled and has high hardness, and the durability of the core plate can be improved.

  According to the second feature of the present invention, the matte surface formed on the surface of the core plate by sandblasting can promote the anchor effect of the adhesive and increase the adhesive strength of the lining.

  According to the third feature of the present invention, it is possible to easily and reliably obtain a core plate that is smooth on both sides and does not have an extra pressure receiving portion as it is.

  Embodiments of the present invention will be described based on preferred embodiments of the present invention shown in the accompanying drawings.

  1 is a longitudinal sectional view of a multi-plate clutch having a friction plate manufactured according to the present invention, FIG. 2 is a partially broken plan view of the friction plate, FIG. 3 is a sectional view taken along line 3-3 in FIG. FIG. 5 is an enlarged view of part 5 of FIG. 4 (showing the state when the core plate is formed), and FIG. 6 is a view after forming the core plate. FIG. 7 is a plan view of the core plate immediately after being taken out from the casting apparatus.

  First, the structure of the multi-plate clutch C and the friction plate incorporated therein will be described with reference to FIGS.

  In FIG. 1, a multi-plate clutch C includes a bottomed cylindrical clutch outer 2 to which an input gear 1 is coupled, a clutch inner 3 disposed in the clutch outer 2 so as to be rotatable relative to the clutch outer 2, and a clutch outer. 2 and a plurality of drive friction plates 4, 4... That are spline-fitted to be slidable in the axial direction, and these drive friction plates 4, 4. A plurality of driven friction plates 5, 5..., A pressure receiving plate 6 integrally connected to one end of the clutch inner 3 and facing the outer surface of the drive friction plates 4, 4. And a pressure plate 7 facing the outer surface of the drive friction plate 4 at the position.

  The pressure plate 7 is connected to the clutch inner 3 so as to be slidable in the axial direction and to be integrally rotatable therewith. The pressure plate 7 is integrally provided with a plurality of support arms 8 (only one of them is shown in the figure) that penetrates the side wall of the clutch inner 3 and protrudes outward. A release plate 9 is fixed to the tip of 8 with a bolt 12, and a clutch spring 10 that urges the pressure plate 7 toward the pressure receiving plate 6 via the release plate 9 is compressed between the release plate 9 and the clutch inner 3. Established. An output shaft 11 that passes through the center portion of the clutch outer 2 is spline-coupled to the hub 3 a formed at the center portion of the clutch inner 3.

  Thus, when the urging force of the clutch spring 10 is applied to the pressure plate 7 via the release plate 9, the pressure plate 7 cooperates with the pressure receiving plate 6 to pinch the driving and driven friction plates 4 and 5 groups. The multi-plate clutch C is in a connected state and enables power transmission between the input gear 1 and the output shaft 11. When the release plate 9 is pressed against the urging force of the clutch spring 10, the pressure plate 7 moves backward from the driving and driven friction plates 4 and 5 side to release the clamping pressure on the driving and driven friction plates 4 and 5 group. As a result, the multi-plate clutch C is disengaged and power transmission between the input gear 1 and the output shaft 11 can be interrupted.

  As shown in FIGS. 2 and 3, the drive friction plate 4 includes a core plate 15 made of a light alloy such as an Al alloy, and a lining 16 made of a friction material bonded to both side surfaces thereof. In the illustrated example, the lining 16 is composed of a large number of strip-shaped lining pieces 16a, 16a,... Arranged at equal intervals in the circumferential direction of the core plate 15, and adjacent lining pieces 16a, 16a,. The groove 17 defined between the two forms a passage for cooling oil.

  The core plate 15 includes an annular core plate main body 15a and a plurality of transmission claws 15b, 15b,... That are integrally projected on the outer periphery of the core plate main body 15a so as to be arranged at equal intervals in the circumferential direction. Each transmission claw 15b is formed thicker than that of the core plate main body 15a. These transmission claws 15b, 15b are slidably fitted into the spline grooves of the clutch outer 2 and receive the driving torque of the clutch outer 2. The thickening of each transmission claw 15b is because the transmission claws 15b This is effective in reducing the surface pressure of the torque transmission surface against the clutch outer 2 and improving its durability. The lining 16 is joined to both side surfaces of the core plate main body 15a via an adhesive 18.

  Next, a method of manufacturing the drive drive friction plate 4 (hereinafter simply referred to as the friction plate 4) will be described with reference to FIGS.

  First, a casting apparatus for forming the core plate 15 in the drive friction plate 4 will be described. In FIG. 4, the casting apparatus D includes a machine base 20, a fixed mold holder 21 supported by the machine base 20, a moving base 22 that is opposed to the machine base 20 so as to advance and retreat along the arrow S direction, and an intermediate base 23. And a movable mold holder 24 supported via the. A fixed mold 25 is attached to the fixed mold holder 21, and a movable mold 27 defining a cavity 26 corresponding to the outer shape of the core plate 15 in cooperation with the fixed mold 25 is a movable mold holder 24. Attached to. Giving the cavity 26 a shape corresponding to the outer shape of the core plate 15 means that the core plate 15 formed by the cavity 26 is not provided with an extra pressure receiving portion that requires trimming. .

  As shown in FIG. 5, the movable mold 27 includes an inner movable block 28 that forms the inner peripheral wall 26 a of the cavity 26, and an outer side that surrounds the inner movable block 28 and forms the main part of the outer peripheral wall 26 b of the cavity 26. The movable block 29 and an intermediate movable block 30 which is disposed between the inner and outer movable blocks 28 and 29 and forms one inner wall 26c of the cavity 26 are configured. The other inner wall 26 d of the cavity 26 is formed by a fixed mold 25.

  The inner and outer movable blocks 28 and 29 are fixed to a common mounting substrate 31 attached to the movable mold holder 24. On the other hand, the intermediate movable block 30 is fitted to the inner and outer movable blocks 28 and 29 so as to slide along the arrow S direction. The intermediate movable block 30 is connected to an operation plate 32 disposed in the hollow portion 23 a of the intermediate base 23 via a plurality of connecting rods 33, 33 that penetrate the movable mold holder 24. The actuating plate 32 includes a plurality of sleeves 35, 35 that are fixedly attached to the movable mold holder 24 and slidably fit into a plurality of guide shafts 34, 34 extending in the direction of the arrow S. The actuating plate 32 can be moved back and forth along the lines 34 and 34. The retracted position of the operating plate 32 is regulated by the back surface of the operating plate 32 coming into contact with the huge heads 34a of the guide shafts 34, 34, and the forward position of the operating plate 32 is movable on the front surface of the operating plate 32. It is regulated by coming into contact with a stopper member 36 fixed on the back surface of the mold holder 24. In this way, a certain advance / retreat stroke is applied to the operation plate 32. When the operating plate 32 occupies the retracted position, the intermediate movable block 30 is held at the molding position A where the front surface of the intermediate movable block 30 is retracted from the front surfaces of the inner and outer movable blocks 28 and 29, and the operating plate 32 occupies the advanced position. In some cases, the hollow movable mold 27 is held at the discharge position B where the front surface protrudes from the front surfaces of the inner and outer movable blocks 28 and 29.

  An actuator 40 provided on the moving base 22 is connected to the operating plate 32 via an operating rod 41 so as to advance and retract the operating plate 32.

  Between the contact surfaces of the fixed mold 25 and the outer movable block 29, a gate 42 is formed that opens at the outer peripheral portion of the cavity 26 corresponding to the valley portion between the transmission claws 15b, 15b.

  In forming the core plate 15, first, as shown in FIG. 5, the moving plate 22 is moved to the machine base 20 in a state where the operation plate 32 is moved backward by the actuator 40 and the intermediate movable block 30 is moved back to the forming position A and held. The inner and outer movable blocks 28 and 29 of the movable mold 27 are brought into close contact with the fixed mold 25. Then, a cavity 26 corresponding to the outer shape of the core plate 15 is defined between the movable mold 27 and the fixed portion. Therefore, a molten light alloy as a raw material of the core plate 15 is injected and filled into the cavity 26 from the gate. The core plate 15 is formed. Then, after the core plate 15 in the cavity 26 is solidified, the movable table 22 is moved backward to open the mold. That is, the movable mold 27 is separated from the fixed mold 25.

  As described above, since the inner peripheral wall 26a and the outer peripheral wall 26b of the cavity 26 are formed by the inner movable block 28 and the outer movable block 29, respectively, when the mold is opened, the molded core plate 15 is also moved by the movable mold 27. It moves away from the fixed mold 25 in a state of being accommodated on the side.

  After the movable mold 27 is separated from the fixed mold 25 by a certain distance, the actuator plate 40 is moved forward by the actuator 40 to move the intermediate movable block 30 forward to the discharge position B as shown in FIG. Since the intermediate movable block 30 is involved in the formation of the entire one side surface of the cavity 26, the intermediate movable block 30 presses the entire one side surface of the core plate 15 while the intermediate movable block 30 reaches the advanced position. The inner and outer movable blocks 28 and 29 can be discharged to the outside without being deformed and without causing a pressing mark on the core plate 15. The core plate 15 can be naturally dropped from the intermediate movable block 30 or can be easily discharged by air pressure.

  The core plate 15 thus cast is smooth on both sides as it is, has no trace of extrusion, has no warpage, and has a small runner 45 embedded in the gate 42 attached thereto. Other than this, there is no extra pressure receiving part, so the yield of raw materials is good, and post-processing such as cutting and trimming is hardly required.

  After casting, the surface of the core plate 15 is sandblasted to form a pear ground 44 (see FIG. 3), and then the adhesive 18 is applied to the pear ground on both sides of the core plate main body 15a. The lining 16 is joined to both side surfaces of the core plate main body 15a via The pear ground 44 promotes the anchor effect of the adhesive 18 and contributes to strengthening the adhesive strength of the lining 16.

  In this way, the core plate 15 can be obtained as an as-cast core plate with smooth both sides and no extra pressure-receiving portions, and without warping, and therefore post-processing such as cutting and trimming. In addition, since the yield of raw materials is good, the production cost can be greatly reduced. Further, the lining 16 can be securely bonded to both side surfaces of the as-cast cocoon of the core plate main body 15a. Furthermore, since the entire surface of the core plate 15 is as-cast, it is chilled and has high hardness, and the durability of the core plate 15 can be improved.

  The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention. For example, the present invention can also be applied to the manufacture of the driven friction plate 5 having a plurality of transmission claws on the inner periphery. It can also be applied to manufacture brake friction plates.

It is a longitudinal cross-sectional view of a multi-plate clutch provided with the friction plate manufactured by this invention. It is a partially broken plan view of the friction plate. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. It is a longitudinal cross-sectional view of the casting apparatus used for shaping | molding of the core plate in the said friction plate. FIG. 5 is an enlarged view of a part 5 in FIG. 4 (showing a state when the core plate is molded). FIG. 7 is a view corresponding to FIG. 6 showing a discharge state after forming the core plate. It is a top view of the core board just after taking out from a casting apparatus.

Explanation of symbols

A ... Forming position B ... Discharge position D ... Casting device 4 ... Friction plate (drive friction plate)
15 ... Core plate 15a ... Core plate main body 15b ... Transmission claw 25 ... Fixed mold 26 ... Cavity 26a ... Internal peripheral wall 26b of the cavity ... outer peripheral wall 26b of the cavity ... one inner wall 26b of the cavity ... the other inner wall 27 of the cavity ... movable mold 28 ... inner movable block 29 ... ... Outer movable block 30 ... Intermediate movable block

Claims (3)

A core plate (15) in which a plurality of transmission claws (15b) that are thicker than that and arranged at equal intervals in the circumferential direction are integrally projected on the inner periphery or outer periphery of the annular core plate main body (15a) And a friction plate manufacturing method comprising a friction material lining (16) bonded to a side surface of the core plate main body (15a),
A raw material is cast into a cavity (26) defined between the fixed mold (25) and the movable mold (27) so as to correspond to the outer shape of the core plate (15) so that trimming after molding is unnecessary. A casting process for forming the core plate (15), and after the casting process, a mold opening for opening the two molds (25, 27) with the core plate (15) attached to one mold After the process and the mold opening process, a part (30) of the one mold contacting the whole side surface of the core plate (15) is moved relative to the other part (28, 29). A discharge step of discharging the core plate (15); and a lining bonding step of bonding a lining (16) to a side surface of the core plate main body (15a) of the core plate (15) after the discharge step. A friction plate manufacturing method. In the manufacturing method of the friction plate of Claim 1,
A method for manufacturing a friction plate, characterized in that a sandblasting process for performing a sandblasting process in which the surface of the core plate (15) is made to be a matte surface is interposed between the discharging process and the lining bonding process. A core plate casting apparatus for a friction plate according to claim 1,
In order to define the cavity (26), a fixed mold (25) and a movable mold (27), which can be opened and closed with respect to each other, are provided, and the movable mold (27) is disposed inside the cavity (26). An inner movable block (28) forming a peripheral wall, an outer movable block (29) surrounding the inner movable block (28) to form the outer peripheral wall of the cavity (26), and the inner and outer movable blocks (28 29), the molding position (A) for forming one inner wall (26c) of the cavity (26) and the core plate (15) when the mold is opened after the core plate (15) is molded. An apparatus for casting a core plate in a friction plate, characterized by comprising an intermediate movable block (30) that can move between a discharge position (B) that pushes out of the inner and outer movable blocks (28, 29).

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