JP2019090435A - Plate and viscous coupling - Google Patents

Abstract

To provide a plate that can control oil flow and miniaturize a viscous coupling as a whole, and to provide a viscous coupling.SOLUTION: A plate is used for a power transmission device with a viscous coupling, is formed into a hollow disc shape and has a plurality of groove parts each extending in a radial direction and formed at the surface thereof. With the formation of the groove parts, oil flow at the surface can be controlled.SELECTED DRAWING: Figure 1

Description

  The present invention relates to, for example, a plate for torque transmission used in viscous coupling and a viscous coupling.

  Conventionally, viscous couplings (viscous couplings) are known as differential rotation sensitive torque transmitting devices used for limited slip differentials (LSD) and four-wheel drive (4WD) (for example, patent documents 1)). In the viscous coupling, the shaft and the case are rotational axes. The shaft is provided with an inner plate that rotates in conjunction with the shaft. The case is provided with an outer plate that rotates in conjunction with the case. An oil of high viscosity is contained in the case. Normally, the inner plate and the outer plate rotate independently of each other, and when the rotation difference from the outer plate occurs in the state where the inner plate is rotated by the rotation of the shaft, the torque of rotation is through oil. It is transmitted to the outer plate and rotates. The case rotates in conjunction with the rotation of the outer plate. On the other hand, when the difference in rotation between the plates is large and the idle state of one wheel continues long or the high-speed rotation state continues, friction occurs between the plate and the oil, and this friction generates heat. When the oil expands due to the generated heat, the inner plate closely contacts the outer plate, and the inner plate and the outer plate rotate integrally. Thus, in the viscous coupling, transmission of torque according to the rotation difference is performed. In patent document 1, the abrasion at the time of plates in close contact is suppressed by forming a slit and a through-hole in each plate.

Patent No. 6085237

  By the way, in the configuration of Patent Document 1, in order to achieve sufficient torque transmission, it is necessary to provide a large number of plates, and there is a problem that it is not suitable to miniaturize the entire viscous coupling. In addition, if there is a shortage of oil during thermal expansion, friction between the plates may cause the plates to wear and the torque may not be transmitted efficiently. It is desirable to control the flow of oil in order to maintain efficient torque transfer between the plates. However, with the slits and through holes formed in the plate disclosed in Patent Document 1, the flow of oil can not be controlled.

  The present invention has been made in view of the above, and it is an object of the present invention to provide a plate and a viscous coupling that can control the flow of oil and can miniaturize the entire viscous coupling.

  In order to solve the problems described above and to achieve the object, a plate according to the present invention is a plate used for a power transmission mechanism by a viscous coupling, which has a hollow disk shape and a plurality of radially extending surfaces respectively. A groove is formed. The plate according to the present invention is characterized in that by combining such plates, the total number of plates constituting the joint can be reduced or the outer diameter of the plate can be reduced.

  Further, in the above-mentioned invention, the plate according to the present invention is characterized in that each of the plurality of groove portions extends linearly.

  The plate according to the present invention is characterized in that, in the above-mentioned invention, the plurality of groove portions extend from one end to the other end in the radial direction of the plate.

  In the plate according to the present invention, in the above invention, the groove has a depth of 5 μm to 50 μm and a groove width of 10 μm to 70 μm, and the width of the groove in the circumferential direction is adjacent to each other in the circumferential direction It is equal to or less than the circumferential width of the flat portion on the surface of the plate, which is a dimension obtained by subtracting the groove width from the distance between the groove portions.

  In the viscous coupling according to the present invention, a hollow disk-shaped first plate, a shaft inserted through the first plate and supporting the first plate movably in the axial direction, and the shaft inserted A hollow disk-shaped second plate, a hole for receiving a portion of the shaft, the first plate, and the second plate are formed, and a case for supporting the outer periphery of the second plate, and a hole for receiving the second plate. And the first and second plates are alternately arranged along the axial direction of the shaft, and the first and second plates are radially arranged on the surface of each plate. A plurality of grooves extending respectively are formed.

  ADVANTAGE OF THE INVENTION According to this invention, it is effective in the ability to control the flow of oil and to miniaturize the whole viscous coupling.

FIG. 1 is a schematic view showing a schematic configuration of a viscous coupling according to an embodiment of the present invention. FIG. 2 is a schematic view showing a schematic configuration of the viscous coupling according to the embodiment of the present invention. FIG. 3 is a schematic view showing a configuration of an inner plate provided in the viscous coupling according to the embodiment of the present invention. FIG. 4 is an enlarged view showing the configuration of the main part of the inner plate provided in the viscous coupling according to the embodiment of the present invention. FIG. 5 is an enlarged view showing the configuration of the main part of the inner plate provided in the viscous coupling according to the embodiment of the present invention. FIG. 6 is a schematic view showing a configuration of an outer plate provided in the viscous coupling according to the embodiment of the present invention. FIG. 7 is an enlarged view showing the configuration of the main part of the outer plate provided in the viscous coupling according to the embodiment of the present invention. FIG. 8 is an enlarged view showing the configuration of the main part of the outer plate provided in the viscous coupling according to the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited by the following embodiments. Further, the drawings referred to in the following description merely schematically show the shapes, sizes, and positional relationships to the extent that the contents of the present invention can be understood, and thus the present invention is illustrated in each of the drawings. It is not limited only to the shape, size, and positional relationship.

Embodiment
First, viscous coupling according to the embodiment will be described. 1 and 2 are schematic views showing a schematic configuration of a viscous coupling according to an embodiment of the present invention. The viscous coupling 1 shown in FIG. 1 is a viscous coupling provided with a first shaft 10 and a case 21 supporting the second shaft 20. In the viscous coupling 1, the first shaft 10 and the second shaft 20 (case 21) are rotation axes. In FIG. 1, the central axis (rotational axis) of the first shaft 10 and the central axis (rotational axis) of the second shaft 20 coincide with the axis N of the viscous coupling 1. When the viscous coupling 1 is applied to an automobile, for example, the first shaft 10 transmits torque to the front wheels, and the second shaft 20 transmits torque to the rear wheels.

  The first shaft 10 is provided with a support member 11 and an inner plate 12. The support member 11 is provided on the outer periphery of the first shaft 10 and supports the inner plate 12 by inserting the inner plate 12. At this time, the inner plate 12 is supported by the support member 11 so as to be movable in the direction of the axis (the axis N shown in FIG. 1) of the first shaft 10. That is, the inner plate 12 is supported by the first shaft 10 movably in the axial N direction via the support member 11. The inner plate 12 rotates in conjunction with the rotation of the first shaft 10. The support member 11 may be integrally formed with the first shaft 10.

  The case 21 is provided with an outer plate 22 that rotates in conjunction with the case 21 and a spacer 23 for maintaining a space between the outer plates 22 adjacent in the direction of the axis N. An outer periphery of the outer plate 22 is supported by the case 21. The inner plate 12 and the outer plate 22 are alternately arranged along the axis N direction. In the present embodiment, the inner plate 12 and the outer plate 22 are plates used for a power transmission mechanism by a viscous coupling.

  The front end of the first shaft 10 to be inserted into the case 21 is supported by a bearing 30. The bearing 30 prevents the rotational power of the first shaft 10 from being directly transmitted to the case 21.

  The case 21 is formed with a hole 21 a having a hole shape capable of accommodating the inner plate 12, the outer plate 22 and the spacer 23. The hole 21 a is kept watertight by the outer surface of the support member 11 and the seal member 31.

  The silicone oil 32 is accommodated in the space formed by the support member 11, the hole 21 a and the seal member 31. The oil contained in this space is not limited to the silicone oil 32 as long as it is a fluid (viscous fluid) having high viscosity and capable of transmitting torque.

  Usually, the inner plate 12 and the outer plate 22 rotate independently of each other, and when the rotation difference with the outer plate is generated in a state where the inner plate 12 is rotated by the rotation of the first shaft 10, silicone oil 32 transmits the torque of the first shaft 10 to the outer plate 22. The outer plate 22 is rotated by the torque transmitted by the silicone oil 32. In the viscous coupling 1, when the outer plate 22 is rotated by the silicone oil 32, the case 21 and the second shaft 20 are rotated. The mode in which the torque is transmitted in this manner is called viscous mode.

  On the other hand, when the rotational difference between the inner plate 12 and the outer plate 22 is large, and one idle state continues for a long time or the high-speed rotation state continues, between the inner plate 12 (or outer plate 22) and the silicone oil 32 Friction occurs, which generates heat. In the viscous coupling 1, when the silicone oil 32 expands due to the generated heat, the inner plate 12 is in close contact with the outer plate 22, and the inner plate 12 and the outer plate 22 rotate integrally (see FIG. 2). The mode in which the torque is transmitted in this manner is called a hump mode. In the state shown in FIG. 2, when the inner plate 12 slides on the outer plate 22, torque due to the rotation of the inner plate 12 is directly transmitted from the inner plate 12 to the outer plate 22.

  FIG. 3 is a schematic view showing a configuration of an inner plate provided in the viscous coupling according to the embodiment of the present invention. FIG.4 and FIG.5 is an enlarged view which shows the structure of the principal part of the inner plate with which the viscous coupling concerning embodiment of this invention is provided. FIG. 4 is an enlarged view of a part of the surface of the inner plate 12. FIG. 5 is a view of a part of the inner plate 12 as viewed in the radial direction.

  The inner plate 12 includes a hollow disk-shaped main body portion 121. In the main body portion 121, a hollow portion 122 fixed to the support member 11 and having a corrugated edge portion and a plurality of through holes 123 which are provided along the circumferential direction and penetrates in the plate thickness direction are formed. Further, as shown in FIG. 4, on the surface of the main body portion 121, a plurality of groove portions 124 which extend linearly along the radial direction of the inner plate 12 are formed. The groove portion 124 has a bottomed groove shape formed on the surface of the inner plate 12. The plurality of grooves 124 are radial and intersect, for example, at the center of the main body portion 121 (or the hollow portion 122). The grooves 124 are formed on both sides of the inner plate 12.

As shown in FIG. 5, the groove 124 has a groove depth (groove depth D ₁ ) of 5 μm to 50 μm. Further, the groove width W ₁ of the groove 124 is 10μm or more 70μm or less.

A plurality of grooves 124, the groove depth D ₁ and the groove width W ₁ satisfies the above condition, and the inner diameter portion of the groove distance between the grooves 124 adjacent to each other in the circumferential direction is most dense (the inner plates 12 in the center side), the circumferential width of the groove 124 (e.g., corresponding to the groove width W ₁₎ is the circumferential direction of the width of the flat portion constituting the surface of the body portion 121 (for example, a width W _10: groove from the groove distance W ₂₀ This corresponds to the value obtained by subtracting the width W ₁ ) or less.

  FIG. 6 is a schematic view showing a configuration of an outer plate provided in the viscous coupling according to the embodiment of the present invention. 7 and 8 are enlarged views showing the configuration of the main part of the outer plate provided in the viscous coupling according to the embodiment of the present invention. FIG. 7 is an enlarged view of a part of the surface of the outer plate 22. As shown in FIG. FIG. 8 is a view of a part of the outer plate 22 as viewed from the radial direction.

  The outer plate 22 includes a hollow disk-shaped main body portion 221. In the main body portion 221, the outer edge fixed to the case 21 is corrugated. The main body portion 221 is provided with a hollow portion 222 through which the support member 11 can be inserted, and a plurality of through holes 223 provided along the circumferential direction and penetrating in the thickness direction. Further, on the surface of the main body portion 221, as shown in FIG. 7, there are formed a plurality of groove portions 224 each extending linearly along the radial direction of the outer plate 22. The groove portion 224 has a bottomed groove shape formed on the surface of the outer plate 22. The plurality of grooves 224 are radial and intersect, for example, at the center of the main body portion 221 (or the hollow portion 222).

As shown in FIG. 8, the groove portion 224 has a groove depth (groove depth D ₂ ) of 5 μm to 50 μm and a groove width W ₂ of 10 μm to 70 μm. The plurality of grooves 224, satisfy the groove depth D ₂ and groove width W ₂ is the above conditions, and the inside diameter portion of the groove distance between the grooves 224 adjacent to each other in the circumferential direction is most dense (outer plates in 22 center side of) the circumferential direction of the width of the groove 224 (e.g., corresponding to the groove width W ₂₎ is circumferential width of the flat portion constituting the surface of the body portion 221 (e.g., the width W _11: groove spacing W ₂₁ has a corresponding) below minus the groove width W ₂ from.

  In the embodiment described above, the plurality of radial grooves 124 and 224 are formed on the outer surfaces of the inner plate 12 and the outer plate 22 provided in the viscous coupling 1. As a result, the coefficient of friction or the holding property of the silicone oil 32 interposed between the inner plate 12 and the outer plate 22 can be improved, and the flow of oil in the inner plate 12 and the outer plate 22 can be controlled. As a result, in the normal viscous mode, the friction between the inner plate 12 and the outer plate 22 and the oil is increased, and the effect of improving the torque transmission efficiency is obtained. In the hump mode, the excess oil is quickly made to the outside Promote discharge. Furthermore, in the viscous mode, seizing and abrasion of the sliding surface can be suppressed without causing shortage of the silicone oil 32 on the sliding surface. In addition, the silicone oil 32 on the sliding surfaces of the inner plate 12 and the outer plate 22 can be agitated, and the formation of an oil film by the silicone oil 32 can be suppressed. According to the present embodiment, the flow of oil can be controlled by the formation of the groove portions 124 and 224, and the number of plates can be reduced compared to the conventional case by the improvement of the torque transmission efficiency. The entire viscous coupling can be miniaturized.

  Further, in the present embodiment, the formation of the grooves 124 and 224 increases the surface area of each of the inner plate 12 and the outer plate 22. Thereby, the bonding area can be increased, and the bonding strength can be increased.

  In the present embodiment, the groove portions 124 and 224 viewed from the radial direction have been described as having a V-like shape, but they may be rectangular, trapezoidal or the like. The shapes of the grooves 124 and 224 may be the same as or different from each other.

  Further, in the present embodiment, the plurality of grooves 124 and 224 are described as extending from one end to the other end of each plate, and each end reaches the outer edge, for example, one end of the groove is the outer edge It may not be reached.

  Further, in the present embodiment, the plurality of groove portions 124 and 224 have been described as having a radial shape, but it may extend from one side to the other side in the radial direction of the plate, for example, the center of the through hole 123 It may be formed with an angle of ± 20 degrees with reference to the passing radial center line.

  Further, in the present embodiment, the inner plate 12 and the outer plate 22 used for the viscous coupling 1 which is a viscous joint have been described as an example of the plate. By forming it, the above-mentioned effect can be obtained.

  As described above, the plate and the viscous coupling according to the present invention are suitable to control the flow of oil and to miniaturize the entire viscous coupling.

REFERENCE SIGNS LIST 1 screw coupling 10 first shaft 11 support member 12 inner plate 20 second shaft 21 case 22 outer plate 23 spacer 31 seal member 32 silicone oil 121, 221 main body portion 122, 222 hollow portion 123, 223 through hole 124, 224 groove portion

Claims (5)

A plate used for a power transmission mechanism with a viscous coupling, which has a hollow disk shape,
A plate having a plurality of radially extending grooves formed on a surface thereof. The plate according to claim 1, wherein each of the plurality of grooves extends in a straight line. The plate according to claim 1 or 2, wherein the plurality of grooves extend from one end to the other end in the radial direction of the plate. The groove has a depth of 5 μm to 50 μm and a groove width of 10 μm to 70 μm,
Each groove has a width in the circumferential direction of the groove on the center side of the plate, which is a dimension obtained by subtracting the groove width from the distance between adjacent grooves in the circumferential direction. The plate according to any one of claims 1 to 3, which has a width equal to or less than the width. A hollow disk-shaped first plate,
A shaft inserted through the first plate and axially movably supporting the first plate;
A hollow disk-shaped second plate through which the shaft is inserted;
A case is formed with a hole for receiving a portion of the shaft, the first plate and the second plate, and supports the outer periphery of the second plate;
A viscous fluid contained in the hole;
Equipped with
The first and second plates are alternately arranged along the axial direction of the shaft,
A viscous coupling characterized in that a plurality of grooves extending respectively in the radial direction are formed on the surface of each plate in the first and second plates.

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