JP6548290B2 - Clutch metal plate - Google Patents

Description

  The present invention relates to a metal plate for a clutch.

  The clutch is a device having a function of transmitting and disconnecting power from the driving shaft to the driven shaft. Clutches are employed in machines having power such as automobiles, motorcycles, ships, agricultural machinery and the like. The clutch generally includes a metal plate as a component, and the metal plate is provided with a fitting portion to be fitted in a groove (spline) of the driving shaft or the driven shaft. In recent years, automobiles employing an automatic transmission (hereinafter sometimes abbreviated as AT) as a transmission have become widespread. One that uses a wet multi-plate clutch as AT is also known.

  In recent years, weight reduction and capacity reduction of each part of a car have been studied in order to reduce the fuel consumption of the car. As part of that, attempts are being made to reduce the weight and capacity of the AT. The reduction of the size of the clutch metal plate and the study of reducing the number of metal plates have been conducted. Here, since the metal plate for a clutch slides with another member when engaging the clutch to generate frictional heat, the AT is required to have a good heat dissipation characteristic. Here, in order to diffuse the heat generated locally to the clutch metal plate, there is a means of enlarging the size (capacity) of the clutch metal plate, but if doing so, weight reduction and capacity reduction of the automobile can be achieved. It will be going back.

  As a means to solve this, Patent Document 1 discloses a metal plate for a clutch which is plated with chromium using a material having high thermal conductivity such as copper as a core metal. However, since the metal plate of Patent Document 1 adopts a relatively soft metal, such as copper or gold, as a core metal requiring high rigidity, there is a fear of deformation of the metal plate itself.

JP-A-2-142926

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a metal plate for a clutch which easily conducts heat to the outside.

  The inventor of the present invention does not use a material having a high thermal conductivity such as copper for the entire core metal, but uses it for a part of the metal plate for the clutch which is in contact with the outside. I was reminded to make it As an aspect, it is recalled that the fitting portion of the clutch metal plate is coated with a material having high thermal conductivity, and when such a metal plate is actually produced and tested, a suitable heat conduction effect, ie, metal It was confirmed that the effect of suppressing the temperature rise of the metal plate due to the heat generated in the plate being conducted to the outside was achieved, and the present invention was completed.

  The metal plate for a clutch according to the present invention is characterized by including a fitting portion, and a covering portion which covers at least a part of the fitting portion and which is higher in thermal conductivity than the fitting portion.

  The metal plate for a clutch of the present invention can suppress the temperature rise of the metal plate due to the presence of the coating portion having high thermal conductivity.

FIG. 2 is a schematic plan view of the clutch metal plate of Example 1; It is a partial schematic cross section of the wet multi-disc clutch which employ | adopted the metal plate for clutches of this invention as a separator plate and a core plate. It is a perspective view of the separator plate of the present invention adopted as a wet multi-plate clutch. It is a perspective view of the core plate of the present invention which has adopted a friction material adopted for a wet multi-plate clutch.

  Hereinafter, the best mode for carrying out the metal plate for a clutch of the present invention will be described. In addition, unless otherwise indicated, numerical value range "x-y" described in this specification includes the lower limit x and the upper limit y in the range. Then, the upper limit value and the lower limit value, and the numerical values listed in the examples can be combined arbitrarily to constitute a numerical range. Further, numerical values arbitrarily selected from within the numerical value range can be used as upper limit and lower limit numerical values.

  The metal plate for a clutch according to the present invention is characterized by including a fitting portion, and a covering portion which covers at least a part of the fitting portion and which is higher in thermal conductivity than the fitting portion. Since the fitting portion is in contact with the driving shaft or driven shaft outside the clutch metal plate, the heat generated in the clutch metal plate is effectively conducted to the outside by the presence of the covering portion covering the fitting portion. Ru. As a result, the heat resistance of the AT having the clutch metal plate of the present invention is improved and its durable life is extended as compared with the AT having a metal plate not having a covering portion.

  The metal plate for a clutch of the present invention is made of metal and can be used as a clutch of a machine having power such as the above-mentioned automobile, motorcycle, ship, agricultural equipment and the like. As a shape of the metal plate for clutches of this invention, ring shape can be mentioned. The thickness of the metal plate for a clutch of the present invention is not particularly limited, but for example, it is in the range of 0.5 to 2 mm, preferably 0.6 to 1.5 mm, more preferably 0.7 to 1.2 mm. be able to. The size of the metal plate for a clutch of the present invention is not particularly limited, but in the case of a ring, the inside diameter is 10 to 200 mm, preferably 20 to 150 mm, and the outside diameter is 50 to 300 mm, preferably outside A diameter of 70 to 200 mm can be exemplified.

  The clutch metal plate of the present invention is preferably a wet clutch metal plate used in the presence of oil. With the above oil, automatic transmission fluid (ATF: “ATF” is a registered trademark of Idemitsu Kosan Co., Ltd., but hereinafter referred to as “ATF” regardless of the registered trademark), continuously variable transmission fluid (CVTF) And so on. When the coating of the clutch metal plate of the present invention is in direct contact with the oil under wet conditions, heat conduction from the coating to the oil can be expected, and heat can be dissipated more efficiently.

  The metal plate for a clutch according to the present invention may be a core plate on which a friction material is disposed, or a separator plate cooperating with the core plate, and is for a multi-plate clutch having a plurality of core plates and separator plates Is preferred. When the core plate and the separator plate are pressure-welded and connected to each other, they cooperate to transmit torque. This is the state where the clutch is connected. Conversely, when the core plate and the separator plate are not connected to each other, the clutch is disengaged. The friction material of the core plate is mainly made of paper. Among the clutch metal plates, the separator plate (and the friction material disposed on the core plate) directly generates frictional heat, so the clutch metal plate of the present invention is particularly preferably a separator plate.

  The fitting portion is a portion of the metal plate for a clutch of the present invention which is fitted in a groove (spline) of the driving shaft or the driven shaft. When the shape of the metal plate for a clutch of the present invention is ring-shaped, the fitting portion is present at the outer peripheral edge or the inner peripheral edge, and has a convex-concave shape so that it can be fitted with the spline. The fitting has a spline contact that is in direct contact with the spline.

  The metal plate for a clutch of the present invention is made of metal, but the term made of metal means that metal is included as a material of the metal plate.

  When the metal plate for a clutch of the present invention is viewed from the viewpoint of the material, it can be divided into a metal plate main body for a clutch having a fitting portion and the above-mentioned covering portion. The clutch metal plate main body having the fitting portion may be made of a single material. The material of the clutch metal plate main body may be any material that is usually used for the clutch metal plate, and examples of the components include iron, nickel, manganese, cobalt, chromium, molybdenum, carbon and the like. Specific examples of the material of the metal sheet for the clutch metal include iron alone, alloys of iron and various metals and carbon, and steels described in JIS G 0203 and JIS G 0204. Carbon steels such as S10C, S20C, and S30C described in 4051 can be mentioned. The clutch metal plate main body of the clutch metal plate of the present invention may be coated by a known method, or may be surface-treated by a known method.

  The metal plate for a clutch of the present invention covers at least a part of the fitting portion, and has a covering portion including a material having a higher thermal conductivity than the fitting portion. Due to the presence of the covering portion, heat (mainly frictional heat) generated in the clutch metal plate can be effectively thermally conducted to the outside of the clutch metal plate.

  The material of the covering portion is not particularly limited as long as the material has a thermal conductivity (thermal conductivity) higher than that of the fitting portion (the metal plate main body portion for a clutch). For reference, the thermal conductivity of each material is shown in Table 1.

  For example, when the material of the fitting portion (clutch metal plate main body portion) is carbon steel, as the material of the covering portion, iron, gold, silver, which has a thermal conductivity (thermal conductivity) higher than carbon steel Copper, aluminum, etc. can be selected.

  The covering portion may cover at least the fitting portion. The covering portion preferably covers the spline contact portion in the fitting portion which is in direct contact with the spline. The presence of the covering portion in the fitting portion to be fitted with the spline allows the frictional heat generated at the metal plate main body for the clutch to be applied to the external driving shaft or the driven shaft through the covering portion having high thermal conductivity. Can be conducted. The covering portion may cover the clutch metal plate main body portion other than the fitting portion. However, when the metal plate for a clutch of the present invention is a core plate, it is not necessary to provide a covering portion on the friction material disposition portion on the surface of the core plate where the friction material is disposed. Further, when the metal plate for a clutch of the present invention is a separator plate, it is not necessary to provide a covering portion on the pressure contact portion of the surface of the separator plate that is in pressure contact with the friction material on the core plate.

  There is no limitation in particular in the thickness of a covering part. However, when the thickness of the covering portion becomes a certain value or more, the heat conduction effect is saturated. Therefore, it is reasonable to set the thickness of the covering portion to 30 μm or less. The lower limit of the thickness of the covering portion can be 1 μm, 3 μm or 5 μm. Moreover, if the upper limit of the thickness of a coating | coated part is daringly stated, 20 micrometers or 25 micrometers can be mentioned. By these upper and lower limits, as a range of the thickness of a covering part, 1-30 micrometers, 3-25 micrometers, 5-20 micrometers can be illustrated, for example.

  As a method of providing a coating | coated part in the metal plate main body part for clutches containing a fitting part, electroplating, electroless plating, hot-dip plating, vapor deposition, sputtering etc. can be mentioned. If it is not necessary to cover the area, the cover may be removed as appropriate.

  The metal plate for a clutch of the present invention can be employed to manufacture the above-mentioned vehicle, motorcycle, ship, clutch for agricultural machinery, and / or wet clutch used in the presence of oil and / or multi-plate clutch.

  As mentioned above, although embodiment of the metal plate for clutches of this invention was described, this invention is not limited to the said embodiment. In the range which does not deviate from the summary of the present invention, it can carry out with various forms which gave change, improvement, etc. which a person skilled in the art can make.

  Hereinafter, the present invention will be described more specifically by showing examples. The present invention is not limited by the following examples. In the following, “parts” means parts by mass and “%” means mass%, unless otherwise specified.

Example 1
The material is S20 C (carbon: 0.18 to 0.23%, silicon: 0.15 to 0.35%, manganese: 0.30 to 0.60%, phosphorus: 0.030 or less, sulfur: 0.035 or less A ring-shaped separator plate having an inner diameter of mm 105 mm, a maximum outer diameter (spline tooth diameter) of 145 145 mm, a minimum outer diameter (excluding spline teeth) of 135 135 mm, and a thickness of 1.8 mm was prepared. An uneven fitting portion is formed on the outer peripheral edge of the separator plate. The entire separator plate was copper plated to a thickness of 5 μm. With respect to the separator plate after copper plating (after formation of the covering portion), the copper plating on the portion (portion including the pressure contact portion pressed against the friction material) to be in contact with the friction material in Test Example 1 below is peeled off. It was set as a metal plate for 1 clutch.

  The plane schematic diagram of the metal plate for clutches of Example 1 is shown in FIG. In FIG. 1, the covering portion of the clutch metal plate 1 of the first embodiment covers the fitting portion 2 including the spline contact portion 3 and the inner peripheral surface portion 4.

(Example 2)
A metal plate for a clutch of Example 2 was obtained by the same method as Example 1 except that the thickness of copper plating was 10 μm.

(Example 3)
A metal plate for clutch of Example 3 was obtained by the same method as Example 1 except that the thickness of copper plating was set to 20 μm.

(Example 4)
A metal plate for a clutch of Example 4 was obtained in the same manner as in Example 1 except that copper plating was replaced by silver plating, and the thickness of the silver plating was 10 μm.

(Comparative example 1)
A separator plate not subjected to plating was used as a metal plate for a clutch of Comparative Example 1.

(Test Example 1)
The friction test was performed on the metal plates for clutches of Examples 1 to 4 and Comparative Example 1 by the following method according to JASO M 348 (Automatic Transmission Fluid Friction Characteristic Testing Method), and the rising temperature of each metal plate was measured.

  Four metal plates for clutches of Example 1 were installed in the casing side plate holder of the automatic transmission oil friction characteristic tester (SEA No. 2). A ring-shaped metal plate (corresponding to a core plate, with a paper friction material with an inner diameter of 90 mm and an outer diameter of 110 mm affixed to both sides of the shaft side plate holder of the automatic transmission oil transmission friction characteristic tester. A total of three sheets (S20C) were installed between the clutch metal plates of Example 1). ATF oil temperature 100 ° C., ATF supply amount 600 mL / min. A friction test of 1000 cycles was performed at a rotation speed of 3600 rpm of the shaft side plate holder, a plate surface pressure of 785 kPa, and a test time of 30 seconds. The friction test was similarly performed on the metal plates for clutches of Examples 2 to 4 and Comparative Example 1. Table 2 shows the results of the rising temperatures of the metal plates for clutches of Examples 1 to 4 and Comparative Example 1 by friction tests.

  It can be seen that the temperature rise of the clutch metal plate of the present invention is suitably suppressed by the presence of the covering portion.

(Application example 1)
FIG. 2 shows a partial schematic cross-sectional view of a wet multi-plate clutch 5 employing the metal plate for a clutch of the present invention as a separator plate and a core plate. The materials of the separator plate 20 and the core plate 30 are both carbon steel S20C.

  FIG. 3 is a perspective view of the separator plate 20 employed in the wet multi-plate clutch 5. The separator plate 20 shown in FIG. 3 has the same shape as the clutch metal plate 1 of the first embodiment. The ring-shaped separator plate 20 has an uneven fitting portion 21 formed on the outer periphery. As shown in FIG. 2, the fitting portion 21 of the separator plate 20 is fitted to the spline of the clutch case 6 in the wet multi-plate clutch 5. At this time, in the fitting portion 21 of the separator plate 20, a portion which directly contacts the spline of the clutch case 6 is the spline contact portion 22. The covering portion in the separator plate 20 is copper plating with a thickness of 10 μm, and covers the fitting portion 21 including the spline contact portion 22 and the inner peripheral surface portion 23 (colored portions in FIG. is there.). In the separator plate 20, the portion (contacting portion pressed against the friction material 32) which is in contact with the friction material 32 disposed on the core plate 30 in the wet multi-plate clutch 5 of FIG. There is no department. Depending on the specifications required for the AT, the coating on the inner peripheral surface portion 23 may not be present, or the coating may be only the spline contact portion 22 in the fitting portion 21.

  FIG. 4 is a perspective view of the core plate 30 having the friction material 32 disposed therein, which is employed in the wet multi-plate clutch 5 described above. On the core plate 30 shown in FIG. 4, a plurality of paper-made friction members 32 are attached to both sides of the plate. The core plate 30 has a ring shape, and a convex-concave fitting portion 31 is formed on the inner periphery. As shown in FIG. 2, the fitting portion 31 of the core plate 30 is fitted to the spline of the hub 9 in the wet multi-plate clutch 5. At that time, a portion of the fitting portion 31 of the core plate 30 which directly contacts the spline of the hub 9 is the spline contact portion 33. The covering portion in the core plate 30 is copper plating having a thickness of 10 μm, and covers the fitting portion 31 including the spline contact portion 33 and the outer peripheral surface portion 34 (colored portions in FIG. ). In addition, in the friction material arrangement | positioning part in which the friction material 32 is arrange | positioned among the core plates 30, a coating | coated part does not exist. Note that depending on the specifications required for the AT, there may be a case where the outer peripheral surface portion 34 is not covered, or a case where only the spline contact portion 33 in the fitting portion 31 is covered.

  The wet multi-plate clutch 5 shown in FIG. 2 has a plurality of separator plates 20 and a plurality of core plates 30 on which the friction members 32 are disposed between the separator plates 20. The core plate 30 is fitted at the fitting portion 31 with the spline of the hub 9 as a driving shaft (drive shaft), and is arranged slidably in the driving shaft direction of the hub 9. The hub 9 is provided with a plurality of lubricating oil supply ports 10 which are through holes for supplying ATF in a direction perpendicular to the driving shaft direction. The separator plate 20 is fitted to the spline of the clutch case 6 serving as a driven shaft at the fitting portion 21 and is disposed slidably in the driven shaft direction. In the wet multi-plate clutch 5, other elements not shown and described may be those employed in a normal wet multi-plate clutch.

  The state of the wet multi-plate clutch 5 in FIG. 2 is a state in which the core plate 30 and the separator plate 20 are not connected to each other and the clutch is disengaged. Here, when oil is supplied to the hydraulic chamber 8 partitioned by the clutch case 6 and the piston 7, the piston 7 moves to the right in FIG. 2 by the hydraulic pressure, whereby the friction material 32 of the core plate 30 is produced. And the separator plate 20 are in pressure contact, and the clutch is engaged. In this state, frictional heat is generated on both plates, particularly on the separator plate 20.

  In the wet multi-plate clutch 5 of FIG. 2, since both the separator plate 20 and the core plate 30 made of carbon steel S20C have a coated portion made of copper plating, which has higher thermal conductivity than the carbon steel S20C, The heat generated in both plates can be efficiently conducted to the clutch case 6, the hub 9, the ATF, etc. through the covering portion. As a result, the temperature rise of the separator plate 20 and the core plate 30 is suitably suppressed.

  1: metal plate for clutch, 2: fitting portion, 3: spline contact portion, 4: inner circumferential surface portion, 5: wet multiplate clutch, 6: clutch case, 7: piston, 8: hydraulic chamber, 9: hub 10: lubricating oil supply port 20: separator plate 21: fitting portion of separator plate 22: spline contact portion of separator plate 23: inner peripheral surface portion of separator plate 30: core plate 31: core plate Fitting portion 32: friction material 33: spline contact portion of core plate 34: outer peripheral surface portion of core plate

Claims (4)

A ring-shaped wet clutch metal plate used in the presence of oil,
A fitting portion existing at an outer peripheral edge of the wet clutch metal plate ;
Covering at least a part of the fitting portion and the inner peripheral surface portion of the wet clutch metal plate, and including a covering portion having higher thermal conductivity than the fitting portion and the inner peripheral surface portion; wet the material is characterized iron, gold, silver, copper, zinc, iridium, cadmium, nickel, cobalt, molybdenum, beryllium, ruthenium, rhodium, brass, carbon steel, nickel steel, and is selected from stainless steel Clutch metal plate. A ring-shaped wet clutch metal plate used in the presence of oil,
A fitting portion existing on an inner peripheral edge of the wet clutch metal plate;
Covering at least a part of the fitting portion and the outer peripheral surface portion of the wet clutch metal plate, and including a covering portion having higher thermal conductivity than the fitting portion and the outer peripheral surface portion; For wet clutches characterized in that it is selected from iron, gold, silver, copper, zinc, iridium, cadmium, nickel, cobalt, molybdenum, beryllium, ruthenium, rhodium, brass, carbon steel, nickel steel, and stainless steel Metal plate. The wet clutch metal plate, a core plate friction material is arranged, or, a metal plate for a wet clutch according to claim 1 or 2 is a separator plate for cooperating with said core plate. The thickness of the said coating | coated part is 1-20 micrometers, The metal plate for wet clutches in any one of Claims 1-3.

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