JP2009030663A - Separator plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively suppress the rise of the temperature of a wet friction material during the engagement, to prevent a friction material base on the surface of the wet friction material from being worn, and to extend the life of the wet friction material in a separator plate. <P>SOLUTION: In this separator plate 1, a plurality of grooves 2 (72 grooves for one surface) are radially formed in each surface of a steel plate of flat plate ring shape. The grooves 2 are formed in a generally V shape with a width (w) and a depth (d) in cross section. The grooves 2 are formed in the separator plate 1 over the entire surface. The width (w) of the grooves 2 is within the range of 50 to 500 μm, and the depth (d) is within the range of 10 to 500 μm. They have proper width and depth, therefore, as oil grooves for suppressing the rise of the temperature of the wet friction material to be contacted, can effectively suppresses the rise of the temperature during the engagement. Since the depth of the oil grooves is not too deep and the width is not too wide, a friction material base material on the surface of the wet friction material is not worn, and the life of the wet friction material is extended. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a separator plate that transmits torque by applying a high pressure to a wet friction material that is opposed to the wet friction material while being immersed in oil, and relates to a separator plate that can improve the heat resistance of the wet friction material. is there.

  Conventionally, it is used for a friction material engaging device provided with a plurality of or a single friction plate, which is used in an automatic transmission (hereinafter abbreviated as “AT”) such as an automobile or a transmission such as a motorcycle. As a wet friction material that can be made, a friction material base that has been cut into segment pieces along a flat plate ring shape with a flat plate ring core to reduce costs by improving material yield and to reduce fuel consumption in vehicles by reducing drag torque A segment-type friction material has been developed in which materials are arranged in order with an adhesive at intervals to form oil grooves and bonded over the entire circumference, and the friction material base material cut into segment pieces is also bonded to the back surface. Yes.

  As an example, an AT such as an automobile uses a wet hydraulic clutch, and a plurality of segment type friction materials and a plurality of separator plates are alternately stacked, and torque transmission is performed by pressure-contacting both plates with hydraulic pressure. In order to absorb frictional heat generated when shifting from the non-fastened state to the fastened state and to prevent wear of the friction material, lubricating oil (Automatic Transmission Fluid) , Hereinafter also abbreviated as “ATF”). (“ATF” is a registered trademark of Idemitsu Kosan Co., Ltd.)

  Here, in recent years, with the miniaturization and weight reduction of AT aiming at further lower fuel consumption, improvement of heat resistance of wet friction materials including segment type friction materials has been demanded. Patented for the purpose of improving heat resistance by lowering heat generated at the time of engagement by ATF more efficiently by providing a small width oil groove on the separator plate which is the counterpart of wet friction material The invention disclosed in Document 1 and Patent Document 2 has been made.

  In Patent Document 1, a separator plate used in a wet type multi-plate clutch is provided with minute irregularities extending regularly in a predetermined direction on a friction surface, and the protruding corners of the irregularities are removed. The separator plate according to the present invention is characterized in that the tip is flattened. Thus, the friction characteristics of the wet multi-plate clutch can be improved, the cooling effect can be enhanced, and the wear of the wet friction material can be prevented.

In Patent Document 2, a plurality of concave portions and convex portions are alternately arranged on both sides of the entire surface, and the circumferential interval between the concave portions and the convex portions is separated by the frictional heat between the separator plate and the wet friction material. Wet multi-plate with a separator plate that is shorter than the meandering deformation interval in which the plate meanders and deforms in the plate thickness direction, the recesses and projections extend in the radial direction, and the depth of the recesses is deeper than the thickness of the friction material The invention of the clutch device is disclosed. This prevents heat spots from being generated on the separator plate due to frictional heat, thereby preventing an unpleasant impact (shift shock) during AT shift.
JP 2004- 211728 A JP 2006-200585 A

  However, in the technique described in Patent Document 1, since the height of the unevenness is set to be as small as 0.1 μm to 3 μm, the cooling effect due to the lubricating oil flowing into the recesses is extremely small and occurs during engagement. The heat cannot be lowered efficiently. Also, since the minute unevenness is formed rather than forming the groove, the tip of the minute convex portion is angular and damages the friction material, so that the tip is removed by pressing the roller with a roller or the like. A process is required.

  Further, in the technique described in Patent Document 2, since the depth of the concave portion is formed deeper than the thickness of the friction material (generally about 0.5 mm), the unevenness is too large and becomes a counterpart material. The friction surface of the friction material is easily worn, and the life of the wet friction material including the segment type friction material is shortened. Furthermore, since the width of the concave portion is too wide, the contact area with the wet friction material becomes small, and there is a problem that a good friction coefficient and torque transmission performance cannot be obtained.

  Therefore, the present invention can effectively suppress the temperature rise of the wet friction material during engagement, obtain a good friction coefficient and torque transmission performance, and wear the friction material base on the wet friction material surface. Therefore, an object of the present invention is to provide a separator plate that can extend the life of the wet friction material.

  The separator plate according to the first aspect of the present invention has a rotational torque by engaging in a lubricating oil a wet friction material in which a friction material base material is bonded to a double-sided surface or a single-sided surface on a flat ring metal core. A metal separator plate that transmits at least a portion of the surface that engages with the wet friction material, and a width within a range of 50 μm to 500 μm across at least a portion of the surface that contacts the wet friction material. Is formed with a plurality of grooves in the range of 10 μm to 500 μm.

  Here, the “wet friction material” includes a segment type friction material obtained by bonding a friction material base material cut into segment pieces to a flat plate ring-shaped cored bar on both sides or one side of the entire circumference, and a flat ring-shaped cored bar. Ring-type friction material with a ring-shaped friction material with a ring-shaped friction material base bonded on both sides or one side, and ring-type friction formed by pressing or cutting both sides or one side of a ring-like friction material to form multiple oil grooves in the radial direction All materials are included.

  A separator plate according to a second aspect of the present invention is the separator according to the first aspect, wherein all of the plurality of grooves are provided at equal intervals along the radial direction, and the number thereof is in the range of 24 to 168 per side. It is what is inside.

  A separator plate according to a third aspect of the present invention is the separator according to the first or second aspect, wherein the plurality of grooves are provided over the entire surface of both surfaces.

  A separator plate according to a fourth aspect of the present invention is the separator according to any one of the first to third aspects, wherein the plurality of grooves have a substantially V-shaped cross section.

  The separator plate according to the first aspect of the present invention has a rotational torque by engaging in a lubricating oil a wet friction material in which a friction material base material is bonded to a double-sided surface or a single-sided surface on a flat ring metal core. Separator plate made of metal that transmits at least the surface of the surface that engages with the wet friction material, and has a width of 50 μm to 500 μm and a depth of 10 μm over the entire circumference of the portion that contacts at least the wet friction material. A plurality of grooves in a range of ˜500 μm are formed.

  Here, the “wet friction material” includes a segment type friction material obtained by bonding a friction material base material cut into segment pieces to a flat plate ring-shaped cored bar on both sides or one side of the entire circumference, and a flat ring-shaped cored bar. Ring-type friction material with a ring-shaped friction material with a ring-shaped friction material base bonded on both sides or one side, and ring-type friction formed by pressing or cutting both sides or one side of a ring-like friction material to form multiple oil grooves in the radial direction All materials are included.

  In addition, “at least the surface that engages with the wet friction material” means that, in the case of a separator plate that engages with the wet friction material on both sides, a plurality of grooves are formed on both surfaces, but only one side engages with the wet friction material. In the case of the separator plate to be used, it means that a plurality of grooves may be formed only on one side, or a plurality of grooves may be formed on both sides.

  Further, “at least the portion that contacts the wet friction material” usually means that the entire surface of the separator plate does not contact the wet friction material, and there are portions that do not contact the wet friction material on the outer peripheral side and the inner peripheral side. A plurality of grooves may be formed only in the portion that contacts the wet friction material except the portion, the surface including the inner peripheral side that does not contact the wet friction material, or the outer peripheral side that does not contact the wet friction material This means that a plurality of grooves may be formed on the entire surface including the inner peripheral side and the outer peripheral side not contacting the wet friction material.

  Furthermore, as a method of forming a plurality of grooves, there are methods such as pressure pressing and cutting, and the step of forming the plurality of grooves can be performed either before or after punching the separator plate. It is.

  Here, the width of the plurality of grooves is in the range of 50 μm to 500 μm, and the depth is in the range of 10 μm to 500 μm. Therefore, it has an appropriate width and depth as an oil groove for suppressing the temperature increase of the wet friction material in contact, and the temperature increase during engagement can be effectively suppressed. In addition, since the oil groove width is not too wide, a contact area can be ensured and good friction characteristics can be obtained, and since the oil groove depth is not too deep, the friction material base on the surface of the wet friction material can be obtained. The life of the wet friction material can be extended without wearing the material.

  In this way, the temperature increase of the wet friction material during engagement can be effectively suppressed, a good friction coefficient and torque transmission performance can be obtained, and the friction material substrate on the wet friction material surface can be worn. Therefore, the separator plate can extend the life of the wet friction material.

  In the separator plate according to the invention of claim 2, all of the plurality of grooves are provided at equal intervals along the radial direction, and the number thereof is within the range of 24 to 168 per side, more preferably 72. Within the range of ~ 144.

  By providing a plurality of grooves at equal intervals along the radial direction, it becomes easier for the lubricating oil to flow uniformly into the grooves, and the effect of suppressing the temperature rise is improved uniformly over the entire circumference, and the plurality of grooves Processing for forming the film becomes easier. Furthermore, as a result of earnest experimental research, the inventors have determined that the wet friction material at the time of engagement when the number of grooves provided at equal intervals in the radial direction is within a range of 24 to 168 per side. The present inventors have found that the temperature rise can be more effectively suppressed, and have completed the present invention based on this finding.

  Furthermore, when the number of grooves provided at equal intervals along the radial direction is within a range of 72 to 144 per side, the temperature increase of the wet friction material during engagement is more effectively and reliably performed. This is more preferable because it can be reduced to a lower limit and the processing for forming a plurality of grooves becomes easier.

  In this way, the temperature rise of the wet friction material during engagement can be suppressed more effectively, a good friction coefficient and torque transmission performance can be obtained, and the friction material substrate on the surface of the wet friction material can be worn. The separator plate can extend the life of the wet friction material.

  In the separator plate according to the invention of claim 3, the plurality of grooves are provided over the entire surface of both surfaces.

  Even in the case of a separator plate in which only one side is engaged with the wet friction material, even if a plurality of grooves are provided on both sides, that is, on the side not engaged with the wet friction material, there is no problem in use. In both cases, it is not necessary to manufacture the separator plate separately from the separator plate engaged with the wet friction material, so that productivity is improved.

  In addition, even if a plurality of grooves are formed on the entire surface including a portion not in contact with the wet friction material, there is no problem in use, and it is generally preferable to provide a plurality of grooves over the entire surface. In particular, processing is easy and productivity is improved.

  In this way, the temperature rise of the wet friction material during engagement can be suppressed more effectively, a good friction coefficient and torque transmission performance can be obtained, and the friction material substrate on the surface of the wet friction material can be worn. In other words, the life of the wet friction material can be extended, and the productivity is improved.

  In the separator plate according to the invention of claim 4, the plurality of grooves have a substantially V-shaped cross section. As a result of repeated earnest experiment research on the cross-sectional shape of the plurality of grooves, the present inventors have more effectively increased the temperature of the wet friction material during engagement when the cross-sectional shape is substantially V-shaped, The present invention has been completed based on this finding and found that the friction material substrate on the surface of the wet friction material can be more effectively and reliably suppressed while being able to be reliably suppressed. .

  Further, the plurality of grooves having a substantially V-shaped cross-section are generally more preferable because they are generally easy to process, and the productivity of the separator plate is improved.

  In this way, the temperature rise of the wet friction material during engagement can be suppressed more effectively, a good friction coefficient and torque transmission performance can be obtained, and the friction material substrate on the surface of the wet friction material can be worn. In other words, the life of the wet friction material can be extended, and the productivity is improved.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 6.

  FIG. 1A is a plan view showing an entire structure of a separator plate according to an embodiment (example) of the present invention, and FIG. 1B is a partial longitudinal sectional view showing an AA section of FIG. FIG. 2A is a plan view showing the entire structure of the separator plate according to the first modification of the embodiment of the present invention, FIG. 2B is a plan view showing the entire structure of the separator plate according to the second modification, c) is a plan view showing the entire structure of the separator plate according to the third modified example, (d) is a plan view showing the entire structure of the separator plate according to the fourth modified example, and (e) is a separator according to the fifth modified example. It is a top view which shows the whole structure of a plate.

  FIG. 3A is a plan view showing the entire structure of the separator plate according to the sixth modification of the embodiment of the present invention, and FIG. 3B is a plan view showing the entire structure of the separator plate according to the seventh modification. . FIG. 4 is a plan view showing the overall structure of a conventional separator plate without a groove (comparative example). FIG. 5 is a schematic diagram showing an outline of a test apparatus for measuring the temperature rise suppression effect of the separator plate according to the embodiment (example) of the present invention. FIG. 6 is a graph showing the temperature rise suppressing effect of the separator plate according to the embodiment (example) of the present invention in comparison with a conventional separator plate without a groove (comparative example).

  As shown in FIG. 1A, the separator plate 1 according to the present embodiment (example) is a flat plate ring-shaped steel plate having 24 irregularities on the outer periphery as fitting portions with a torque transmission shaft. A plurality of grooves 72 (72 per side) are provided along the radial direction. In FIG. 1A, the plurality of grooves 2 are represented by two lines. As shown in FIG. 1B, the plurality of grooves 2 are provided on both surfaces of the separator plate 1, and the cross-sectional shape of the plurality of grooves 2 is substantially V having a width w and a depth d. It is a letter shape.

  As shown in FIG. 1A, the plurality of grooves 2 are provided over the entire surface of the separator plate 1. The plurality of grooves 2 were formed by pressing after the shape of the separator plate 1 was punched from the steel plate. Therefore, the separator plate 1 according to the present embodiment (example) corresponds to the separator plate according to the inventions of claims 1, 2, 3, and 4.

  Here, the width w of the plurality of grooves 2 needs to be within a range of 50 μm to 500 μm, and the depth d of the plurality of grooves 2 needs to be within a range of 10 μm to 500 μm. In the separator plate 1 according to this embodiment (example), the plurality of grooves 2 are formed with a width w = 100 μm and a depth d = 100 μm.

  Next, separator plates according to first to seventh modifications of the present embodiment will be described with reference to FIGS. As shown in FIG. 2A, a separator plate 1A according to a first modification of the present embodiment is a flat plate ring-shaped steel plate having 24 irregularities on the outer periphery as fitting portions with a torque transmission shaft. Further, a plurality of (144 per one side) grooves 2A are provided along the radial direction. 2A to 2E, a plurality of grooves are indicated by a single solid line. That is, the separator plate 1 </ b> A according to the first modification is obtained by doubling the number of grooves with respect to the separator plate 1.

  Similar to the separator plate 1, the plurality of grooves 2 </ b> A have a substantially V-shaped cross section, and are provided on both surfaces of the separator plate 1 </ b> A over the entire surface. Therefore, the separator plate 1A according to the first modification of the present embodiment corresponds to the separator plate according to the inventions of claims 1, 2, 3, and 4.

  Further, as shown in FIG. 2B, the separator plate 1B according to the second modification of the present embodiment is formed on a flat plate ring-shaped steel plate having 24 irregularities on the outer periphery, obliquely with respect to the radial direction. A plurality of (72 per side) grooves 2B are provided along the direction. Furthermore, as shown in FIG. 2 (c), the separator plate 1C according to the third modification of the present embodiment is a single-sided surface along the radial direction on a flat plate ring-shaped steel plate having 24 irregularities on the outer periphery. 72 grooves 2Ca per hit and two concentric grooves 2Cb along the circumference are provided.

  Further, as shown in FIG. 2D, the separator plate 1D according to the fourth modified example of the present embodiment has a plurality of lattice patterns on a flat plate ring-shaped steel plate having 24 irregularities on the outer periphery. Grooves 2Da and 2Db are provided. Further, as shown in FIG. 2 (e), the separator plate 1E according to the fifth modification of the present embodiment includes a plurality of plate plates in the radial direction along a flat plate ring shape having 24 irregularities on the outer periphery. A twill-like groove 2E is provided.

  Further, as shown in FIG. 3A, a separator plate 1F according to a sixth modification of the present embodiment includes a plurality of flat plate ring-shaped steel plates having 24 irregularities on the outer periphery along the radial direction. The number of grooves 2F (72 per side) is limited to the range where the wet friction material on the outer peripheral side comes into contact with the outer peripheral edge. 3A and 3B, the plurality of grooves 2 are represented by two lines. Therefore, the inner peripheral side of the plurality of grooves 2F opens to the inner peripheral edge of the separator plate 1F, but the outer peripheral side of the plurality of grooves 2F does not open to the outer peripheral edge of the separator plate 1F.

  Further, as shown in FIG. 3B, a separator plate 1G according to a seventh modification of the present embodiment is formed by a plurality of flat plate ring-shaped steel plates having 24 irregularities on the outer periphery along the radial direction. The number of the grooves 2G (72 per side) is limited to the range where the wet friction material from the inner peripheral side contacts the outer peripheral side. Therefore, neither the inner peripheral side nor the outer peripheral side of the plurality of grooves 2G is open to the peripheral edge of the separator plate 1G.

  Of the separator plates 1, 1 </ b> A, 1 </ b> B, 1 </ b> C, 1 </ b> D, 1 </ b> E, 1 </ b> F, and 1 </ b> G according to the present embodiment described above, the wet friction material is actually used for the separator plate 1 according to the present embodiment (example). The test was conducted to measure the temperature by engaging and confirm the effect of temperature rise suppression according to the present invention. As a comparative example, as shown in FIG. 4, a separator plate 10 made of a flat ring-shaped steel plate having no grooves on the surface and having 24 irregularities on the outer periphery was used.

  The test method will be described with reference to FIG. As shown in FIG. 5, a tester SAE # 2 is used as the test apparatus 3, and the number of discs (wet friction material 4) is set as a set of three, and the wet friction material 4 is a segment type friction material. The number of pieces was 40 on one side, the groove width was 2 mm, and the segment piece (friction material base) 6 had an outer diameter of 176 mm and an inner diameter of 154 mm.

  Also, ATF (registered trademark) is used as the lubricating oil, the amount of the lubricating oil is 600 ml / min, the oil temperature is 100 ° C., the friction rotational speed is 3600 rpm, the surface pressure is 0.785 MPa, and the inertia is 0.343 kg · m 2, 0.245 kg · Three points of m2 and 0.196 kg · m2 were tested, and the temperature of the separator plate with respect to the calorific value qs (at 50 cycles) was measured at three points. The temperature measurement was performed on the second separator plate from the left of the four separator plates shown in FIG. 5 for both the separator plate 1 according to the example and the separator plate 10 according to the comparative example.

  Test results will be described with reference to FIG. As shown in FIG. 6, both the conventional separator plate 10 according to the comparative example and the separator plate 1 according to this embodiment (example) gradually increase in temperature as the calorific value qs increases. However, the separator plate 1 according to the example is suppressed from rising in temperature, and the separator plate 10 according to the comparative example was burned when the calorific value qs was the largest. On the other hand, the separator plate 1 according to the example was only fogged.

  In this way, in the separator plate 1 according to the present embodiment, the temperature increase of the wet friction material 4 during engagement can be more effectively suppressed, and a good friction coefficient and torque transmission performance can be obtained. The friction material base 6 on the surface of the wet friction material 4 is not worn, the life of the wet friction material 4 can be extended, and the productivity can be improved.

  In FIG. 6, only the test results for the separator plate 1 according to the present embodiment (example) are shown, but the other separator plates 1A, 1B, 1C, 1D, 1E, and the like according to the present embodiment are shown. Similarly to the separator plate 1, the effect of suppressing temperature rise can be obtained for 1F and 1G.

  In the present embodiment, the case where a groove having a substantially V-shaped cross section is formed in the separator plate has been described. However, the cross-sectional shape of the groove is not limited to a substantially V shape, and is substantially square, substantially rectangular, Various cross-sectional shapes such as a substantially trapezoidal shape and a semicircular shape can be employed. Moreover, as a formation method of a groove | channel, it can be based on processing methods, such as press (pressing) processing and cutting processing (blade cutting, laser processing, high-pressure cutting, abrasive cutting, etc.).

  Further, in the present embodiment, the case where the grooves are formed on both surfaces of the separator plate has been described. However, for the separator plate in which only one surface is in contact with the wet friction material, the grooves may be formed only on the contact surface.

  In carrying out the present invention, the configuration, shape, quantity, material, size, connection relationship, manufacturing method, and the like of the other parts of the separator plate are not limited to the above embodiments. In addition, since the numerical value quoted in the embodiment of the present invention does not indicate a critical value but indicates a preferable value suitable for implementation, even if the numerical value is slightly changed, the implementation is denied. is not.

FIG. 1A is a plan view showing an entire structure of a separator plate according to an embodiment (example) of the present invention, and FIG. 1B is a partial longitudinal sectional view showing an AA section of FIG. FIG. 2A is a plan view showing the entire structure of the separator plate according to the first modification of the embodiment of the present invention, FIG. 2B is a plan view showing the entire structure of the separator plate according to the second modification, c) is a plan view showing the entire structure of the separator plate according to the third modified example, (d) is a plan view showing the entire structure of the separator plate according to the fourth modified example, and (e) is a separator according to the fifth modified example. It is a top view which shows the whole structure of a plate. FIG. 3A is a plan view showing the entire structure of the separator plate according to the sixth modification of the embodiment of the present invention, and FIG. 3B is a plan view showing the entire structure of the separator plate according to the seventh modification. . FIG. 4 is a plan view showing the overall structure of a conventional separator plate without a groove (comparative example). FIG. 5 is a schematic diagram showing an outline of a test apparatus for measuring the temperature rise suppression effect of the separator plate according to the embodiment (example) of the present invention. FIG. 6 is a graph showing the temperature rise suppressing effect of the separator plate according to the embodiment (example) of the present invention in comparison with a conventional separator plate without a groove (comparative example).

Explanation of symbols

1, 1A, 1B, 1C, 1D, 1E, 1F, 1G Separator plate 2, 2A, 2B, 2Ca, 2Cb, 2Da, 2Db, 2E, 2F, 2G Multiple grooves 4 Wet friction material 5 Core metal 6 Friction material Base material

Claims (4)

A metal separator plate that transmits rotational torque by engaging in a lubricant with a wet friction material in which a friction material base material is bonded to a flat ring-shaped cored bar on both sides or a single side of the circumference. ,
A plurality of grooves having a width in the range of 50 μm to 500 μm and a depth in the range of 10 μm to 500 μm over at least the entire circumference of the surface in contact with the wet friction material. A separator plate characterized in that is formed.   2. The separator plate according to claim 1, wherein all of the plurality of grooves are provided at equal intervals along a radial direction, and the number thereof is within a range of 24 to 168 per side.   The separator plate according to claim 1, wherein the plurality of grooves are provided over the entire surface of both surfaces.   The separator plate according to any one of claims 1 to 3, wherein the plurality of grooves have a substantially V-shaped cross section.

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