JPH01145434A - Electromagnetic wet clutch device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to an electromagnetic wet clutch device, and more particularly to an improvement of a driven rotating member that supports the inner peripheral portion of a driven clutch plate.

"Prior art and its problems" An electromagnetic wet clutch device has a driving side clutch plate that is movable in the axial direction on the driving side rotating member and supports its outer circumference, and a driving side clutch plate that is movable in the axial direction on the driven side rotating member in the oil chamber. Drive side clutch plates that support the inner periphery of the drive side clutch plates are alternately arranged in a stacked manner, and the driving side and driven side clutch plates are brought into a connected state by applying adhesion force by electromagnetic means. It is. This wet type clutch device is compared to the dry type,
Since oil is supplied to the sliding surfaces of the clutch plates, the durability of the clutch friction part is high, the connection base is small, and the connection is smooth.

However, the multiple clutch plates on the driving side and the driven side are laminated, and as the electromagnetic means is excited and demagnetized, they slide in the axial direction with respect to the rotating member on the driving side and the rotating member on the driven side. There were problems with wear and deformation due to this, as well as the generation of abnormal noises. In particular, the driven rotating member that supports the inner circumference of the driven clutch plate in an axially movable manner must be made of a non-magnetic material, numerically a stainless steel material, in order to prevent leakage of magnetic flux due to electromagnetic means. There is. However, stainless steel materials have poor sliding characteristics with the clutch plates, which are usually made of low-carbon steel plates, so they may be scratched or damaged.
The scratches caused the clutch plate to deform, resulting in longer engagement times or incomplete engagement. Furthermore, stainless steel materials have poor frictional properties with the oil seal that keeps the oil chamber fluid-tight, and may damage the oil seal and deteriorate the sealing performance of the oil chamber.

Under these circumstances, conventionally, magnetic materials with excellent wear resistance and lubricity have even been used as the driven-side rotating member that supports the driven-side clutch plate, at the expense of preventing leakage of magnetic flux.

``Object of the Invention'' In view of the above-mentioned problems of electromagnetic wet clutch devices, the present invention provides a driven-side rotating member that supports the inner peripheral part of the driven-side clutch plate in an axially movable manner to prevent leakage of magnetic flux. While using non-magnetic materials such as stainless steel to prevent F-resistant! The purpose is to improve wear resistance, durability, and lubricity.

"Summary of the Invention" The present invention was completed based on the discovery that when a non-magnetic material such as stainless steel is subjected to nitrocarburizing treatment, the friction characteristics with a clutch plate made of a low carbon steel plate are improved.

That is, the present invention includes a driving side clutch plate that is movable in the driving side rotating member in an axial direction and supports its outer peripheral portion, and a driving side clutch plate that is movable in the driven side rotation member and supports its inner peripheral portion in the oil chamber. In an electromagnetic wet clutch device in which driven side clutch plates are arranged alternately in a laminated manner and electromagnetic means is provided to apply adhesion force to the driving side and driven side clutch plates, the driven side rotating member is subjected to nitrocarburizing treatment. It is characterized by being constructed from a non-magnetic material treated with

The soft nitriding treatment can be performed by various known treatments, and for example, salt bath soft nitriding can be used.

"Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. This embodiment is a wet clutch device proposed by the applicant in Japanese Patent Application No. 62-163177, which is further improved to ensure the supply of oil to the center of the clutch plate and the oil seal. This is an example in which the present invention was applied. In other words, the wet type clutch device proposed by the present applicant in Japanese Patent Application No. 163177/1980 uses a pulley generally used as a driving shaft as it is as an oil chamber housing of a wet type clutch in order to achieve miniaturization. A pulley is provided on the outer periphery of the hob that is integrated with the driven shaft so that it can rotate freely relative to the hob, and this pulley, the hob side member, and the cover that is integrated with the pulley form an oil chamber. ,
A driving side clutch plate is located in the oil chamber and supported axially movably on a pulley or cover, and a driven side clutch plate is axially movably supported on a driven shaft side member, and The present invention is characterized in that electromagnetic means is provided to apply a contact force to the clutch plates on the drive side and the driven side.

This wet clutch device is compact because the oil chamber is formed inside the rotating pulley and cover, and because the oil constantly rotates, there is little oil deterioration, and because the electromagnetic means can be placed outside the oil chamber, it has good heat dissipation. It has excellent characteristics such as good performance.

Figures 2 to 7 show a wet clutch device that has been improved to more reliably supply lubricating oil to the center of the driven side clutch plate and the oil seal. . First, the entire wet clutch device will be explained.

A driven shaft 12 connected to, for example, a compressor of a Kartara or a supercharger is rotatably supported in the housing 11, and a hob 13 is integrally connected to an end of the driven shaft 12.

A pulley 15 located on the outer periphery of the driven part 12 is rotatably supported by the housing 11 via a bearing 14 . An oil seal 16 is provided between the pulley 15 and the hob 13.

A cover 20 is fixed to the pulley 15 via a fixing screw 18, and an oil chamber 21 is formed by the cover 20, the pulley 15, and the hob 13.

Therefore, the pulley 15 and the cover 20 constitute a driving side rotating member, and the driven shaft 12 and the hob 13 constitute a driven side rotating member. And for this driving side and driven side members,
A clutch plate located within the oil chamber 21 is supported.

That is, a plurality of axial protrusions 22 are formed on the inner periphery of the end on the cover 20 side of the pulley 15, as is clear from FIG. The groove 23b is fitted in a spline shape and supported so as to be movable in the axial direction. This driving side clutch plate 23 rotates together with the pulley 15 in the rotational direction. On the other hand, the hob 13 has a seventh hole on the outer periphery of the end on the cover 20 side.
As shown in the figure, a spline (a plurality of axial protrusions) 24 is formed, and a spline groove 25b of an annular driven clutch plate 25 is supported by the spline 24 so as to be movable in the axial direction. This driven side clutch plate 25 rotates together with the hob 13 in the rotational direction.

The driving side clutch plates 23 and the driven side clutch plates 25 are stacked alternately, and an armature 26 having a spline hole 26a fitted in the spline 24 is attached to the outer end thereof.
is supported so as to be movable in the axial direction. 27 is a ring that prevents the amateur 26 from being removed.

The pulley 15 has an annular groove 28 that is open on the housing 11 side and matches the circumferential positions of the driving side clutch plate 23, driven side clutch plate 25, and armature 26.
is formed in the annular groove 28, and the housing 1
A coil 30 fixed to 1 via a bracket 29 is located. A magnetic path forming hole 31 is bored in the pulley 15 so that the magnetic flux from the coil 30 reaches the armature 26 via the driving side clutch plate 23 and the driven side clutch plate 25. The magnetic path forming hole 31 is closed by a sealing material 32 made of a non-magnetic material, thereby ensuring the sealing performance of the oil chamber 21. The latch plates 23 and 25 also have magnetic path forming holes 23a whose circumferential positions match the magnetic path forming holes 31,
25a is pierced.

The wet clutch device described above is used by removing the cover 20, filling the oil chamber 21 with an appropriate amount of oil, and then closing the cover 20. First, when the pulley 15 is rotationally driven by the engine while the coil 30 is not energized, the cover 20 and the driving side clutch plate 23 rotate together with the pulley 15 . Since the coil 30 is not energized, the armature 26 is not attracted, and therefore the drive side clutch plate 23
The driven side clutch plate 25 slips, and the hob 13 (driven shaft 12
) rotation is not transmitted to.

On the other hand, when the coil 30 is energized, the pulley 15, the coil 30, the driving side clutch plate 23. Driven side clutch plate 2
5 and the armature 26, a magnetic flux shown by a schematic closed curve A in FIG. 2 is generated, and the armature 26 is attracted to the pulley 15 side. Due to this suction force, the driving side clutch plate 23
and the driven side clutch plate 25 are in strong contact and rotate together,
The hob 13 and the driven shaft 1 together with the driven side clutch plate 25
2 rotates. Therefore, the compressor connected to the driven shaft 12 is driven.

In this wet clutch device, the amount of oil sealed in the oil chamber 21 is limited in order to prevent slipping during engagement, so the drive side clutch plate 23 and the driven side clutch plate 25 in the disengaged state are There is a risk that lubrication between the inner peripheral portion of the hob 13 and the driven clutch plate 25 may become insufficient.

Furthermore, there is a possibility that the oil seal 16 may not be sufficiently lubricated in the disconnected state. For this reason, in the illustrated example, an oil passage is formed in at least the armature 26 and the armature 26 of the hob 13 to guide the oil in the outer peripheral part of the oil chamber 21 to the inner peripheral part. That is, FIGS. 2 to 4 show an example of this, and the armature 26 has an oil groove 40 formed in its surface on the cover 20 side. This oil groove 40 is continuous from the outer circumferential part to the inner circumferential part of the armature 26, and in the disconnected state 78i (the stopped state of the armature 26) where the pulley 15 rotates and the coil 30 is not energized,
It acts to guide the oil entering the outer end to the outer periphery of the hob 13. This oil groove 40 is inclined toward the upstream side in the oil rotation direction (rotation direction of the pulley 20) B, as shown in FIG. 3, so that oil can easily enter the outer end thereof. Alternatively, as shown in FIG. 4, a guide notch 41 can be provided at the outer end.

The hob 13 has an oil introduction hole 43 that penetrates in the radial direction of the hob 13.
．． 44 is worn. This oil introduction hole 43.44
This guides the oil that passes through the oil groove 40 and reaches the center of the hob 13 to the spline 24 or the oil seal 16.

By forming the oil groove 40, the guide notch 41, or the oil introduction hole 43.44 in this manner, the oil located at the periphery of the rotating oil chamber 21 can be reliably guided to the center when the coil 30 is not energized. Can be done. That is, the oil sealed in the oil chamber 21 is
5. Due to the centrifugal force and viscosity caused by the rotation of the cover 20 and the driving side clutch plate 23, the oil is located only on the outer periphery of the oil chamber 21. At this time, the armature 26 stops or rotates slightly as the oil rotates, but the oil located on the outer periphery is absorbed by the oil groove 40 (and the guide notch 40).
1) to the inner circumference of the armature 26, and then to the gap between the clutch plates 23 and 25 through the outer circumference of the spline 24 (arrow C in FIG. 2). Furthermore, the oil that has passed over the outer surface of the hob 13 and reached its center is moved to the oil introduction hole 4 by the centrifugal force of the rotation of the armature 26 due to the clutch connection.
3 to the outer periphery of the spline 24, and similarly to the oil seal 16 via the oil introduction hole 44 (arrow D). Therefore, oil is drawn in when the clutch plates 23 and 25 rotate relative to each other in the disconnected state, and when the clutch plates 23 and 25 rotate in the connected state, the oil is drawn in.
5, as well as the spline groove 25b of the clutch plate 25 and the spline 24, and the oil seal 16 can also be lubricated. clutch plate 2
The oil that has entered the inner periphery between 3 and 25 immediately moves outward due to the centrifugal force of the drive-side clutch plate 23, and in the process lubricates the entire surfaces of the clutch plates 23 and 25.

The oil passage to be formed in the armature 26 can be formed as an oil groove 45 on the side of the clutch plate 23, 25, as shown in FIG. 5A, or as an oil groove 45 in the axial direction as shown in FIG. 5B. It can also be designed as a penetrating oil slit 46. Of course, the oil tR45 and the oil slit 46 can also be provided with an inclination as shown in FIG. 3 or a guide notch 41 as shown in FIG. 4. Furthermore, although the oil passage is formed as grooves 40 and 45 in Figs. 3, 4, and 5A, it is also possible to form the oil passage as a fin type in which only the portions corresponding to the grooves protrude. It is.

In this case, the space between the fins becomes an oil passage.

Note that the oil introduction holes 43 and 44 of the hob 13 are effective in guiding the oil more reliably to the inner periphery of the clutch plates 23 and 25 and the oil seal 16, but even without these, the oil in the armature 26 would be Groove 40.45,
The guide notch 41 and the oil slit 46 make it possible to lubricate the inner periphery of the clutch plates 23 and 25, which can therefore be omitted.

The present invention provides, for example, in the wet clutch device as described above, the hob 13, which is a driven-side rotating member that supports the driven-side clutch plate 23, is made of a non-magnetic material, for example, a stainless steel material, and In order to obtain a stronger magnetic attraction force by preventing leakage of magnetic flux, and further improve its wear resistance, durability and lubricity, this hob 13 has been subjected to soft nitriding treatment. This is a characteristic feature.

1A and 1B show the shape of this hob 13 as a single unit, and the spline 24 is formed on the outer circumference, and the spline 13a for coupling with the driven shaft 12 is formed on the inner circumference.

This hob 13 made of stainless steel has splines 2
4 and the connecting spline 13a,
A soft nitriding treatment is performed, and the surface layer becomes a hardened layer 13b schematically shown in the figure. This hardened layer 13b has splines 24
The sliding characteristics between the clutch plate 23 and the driven side clutch plate 23 are improved. That is, due to low friction, the hardened layer 13b and the driven clutch plate 23 are not easily damaged, and the driven clutch plate 23 is not deformed due to high friction or scratches. Furthermore, it has good sliding properties with the oil seal 16, and the oil seal 16 will not be damaged and its sealing performance will not be impaired as a result.

For example, soft nitriding treatment is carried out using a stainless steel hob 1 in a 550 to 570 m long cyanide salt bath.
This can be carried out by nitrocarburizing in a salt bath by soaking No. 3 for 1 to 2 hours.

(Margin below) Next, other configurations of the illustrated embodiment will be explained.

The cover 20 has an oil supply hole 50 at its center of rotation, and a ventilation hole 51 is formed in the oil supply hole 50.
A plug body 52 having a diameter is removably provided. Plug body 5
The single unit shape of 2 is shown in FIG.

The reason why the oil supply hole 50 is formed at the center of rotation of the cover 20 is to seal oil in the horizontal position as shown in FIG. 2, regardless of the rotational position of the cover 20. In other words, if the amount of oil sealed in the oil chamber 21 is sufficient, the clutch plates and oil seals will be sufficiently lubricated.
Harmful slippage occurs between the clutch plates, resulting in poor connection; conversely, if there is less, the connection is reliable, but lubrication is poor, resulting in seizure. If the oil supply hole 50 is drilled at the center of rotation of the cover 20, regardless of the rotation stop position of the cover 20, until the oil supply hole 50 is reached,
Since oil can be sealed in the horizontal position shown in Figure 2,
A high degree of freedom can be obtained depending on the direction of oil filling work.

The plug body 52 is made of, for example, an elastic material, and has an annular groove 53 corresponding to the shape of the oil supply hole 50 on its circumferential surface. At the time of attachment and detachment, the plug body 52 is deformed to fit the annular groove 53 into the periphery of the oil supply hole 50 or to remove it therefrom. The ventilation hole 51 of this plug body 52 has a slit 51
a, and a tapered hole stb. Tapered hole 51
The opening cross-sectional area b decreases from the oil chamber 21 side toward the outer end, and the slit 51a following this is normally closed.

The vent hole 51 opens when the pressure inside the oil chamber 21 reaches a certain value or more and functions to release the internal pressure. That is, in the above-described wet clutch device, as long as the pulley 15 rotates, the oil sealed in the oil chamber 21 also rotates, and heat is generated due to friction caused by the rotation. When heat is generated, the oil and the enclosed air thermally expand, and as a result, the pressure within the oil chamber 21 increases, which may adversely affect sealing members such as the oil seal 16.

However, according to this structure, when the pressure inside the oil chamber 21 rises above a certain value (when the pressure difference between the inside and outside of the oil chamber 21 exceeds a certain value), the slit 51a of the vent hole 51 opens to release the internal pressure. When the slit 51a opens, the oil is located at the periphery of the oil chamber 21, so the oil does not leak to the outside through the vent hole 51. Since the slit 51a is normally closed, there is no fear that foreign matter such as dust may enter the oil chamber 21.

However, the internal pressure of the oil chamber 21 can be released through an extremely small hole (pinhole), and with the pinhole, there is almost no risk of dust entering. Therefore, it is also possible to construct the ventilation hole from a small hole that is always open.

The driving-side clutch plate 23 and the driven-side clutch plate 25 are made of low carbon steel plates, which are subjected to a satin finish, and are further provided with an oil drain groove 60 as shown in FIGS. 9 to 14 on at least one side thereof. Then, excellent connection characteristics and friction characteristics can be obtained.

As the low carbon steel plate, 5K-5 or 5pcc with a plate thickness of about 0.3 to 3IIffl can be used.

In addition, satin finishing includes roll transfer, shot peening,
It refers to a non-glossy treatment in which numerous highly uniform irregularities with a non-directional Rmax of about 2 to 10 μm are created by sandblasting, grinding, electric field polishing, or plating.

This satin finish suppresses the occurrence of harmful slippage between the driving side clutch plate 23 and the driven side clutch plate 25, generates the frictional force necessary for quick connection, and has excellent wear resistance. expensive. Although the reason for this is not necessarily clear, the uniformity of the unevenness due to the matte finishing effectively works to prevent the formation of an oil film between the driving side clutch plate 23 and the driven side clutch plate 25, resulting in a stable This is thought to be because boundary lubrication is obtained. FIG. 12 schematically shows an example of the size relationship between the satin-finished surface 61 and the oil discharge groove 60.

Further, the oil drain groove 60 is particularly effective in quickly discharging the oil present between the driving side clutch plate 23 and the driven side clutch plate 25 radially outward. It is desirable that at least the outer end of the oil drain groove 60 be open to ensure its discharge. Further, it is desirable to form them on both sides of the driving side clutch plate 23 and the driven side clutch plate 25, respectively. When forming on both sides, if the positions of the oil drain grooves 60 on the front and back sides match, the strength of the thin clutch plate may be impaired. , it is preferable to have different phases or directions. 9 and 10 take the driven side clutch plate 25 as an example, and by changing the direction of the oil drain grooves 60 of the same pattern (lattice), the positions of the oil drain grooves 60 on the front and back sides do not match. This is an example.

The pattern of the oil drain groove 60 can be modified in various ways.

FIG. 11 shows a radial oil drain groove 60, and FIG. 12 shows a spiral oil drain groove 6 (inclined with respect to the radial direction).
0 is shown respectively.

This radial or spiral oil drain groove 50
When forming these on the front and back sides of the driving side clutch plate 23 and the driven side clutch plate 25, it is possible to prevent the positions from matching on the front and back sides by making the phases different between the front and back sides.

Note that the groove width, depth, and pitch of the oil drain groove 60 are as follows:
When the inner diameter of the driving side clutch plate 23 and the driven side clutch plate 25 is 20 to 150 LI1 m1 and the outer diameter is 40 to 200 mm, each of 0.1 to 5 ml11.0.01 a+m or more,
Good results were obtained when the value was set to 1 to 501111.

It is clear that if the driving side clutch plate 23 and the driven side clutch plate 25 are further subjected to soft nitriding treatment, the connection characteristics and wear resistance can be improved. Soft-nitriding treatment is numerically known as a treatment that increases the hardness of the material, but when this treatment is applied to the driving side clutch plate 23 and the driven side clutch plate 25, stable friction characteristics can be obtained.
It has become clear that the stable boundary slip resistance effect can be further enhanced by matte finishing. This nitrocarburizing treatment is
For example, it can be carried out by salt bath nitrocarburizing, in which a low carbon steel plate is soaked for 1 to 2 hours in a salt bath of cyanide or cyanate at 550 to 570°C.

The driving side clutch plate 23 further includes a 15th plate on its periphery.
Apart from the radial groove 23b as axial guide means, as shown in FIGS.

A plurality of, preferably three or more, positioning grooves 70 are provided, and these positioning grooves 70 align and center the radial grooves 23b of the plurality of driven clutch plates 23. In the illustrated example, the radial groove 23b
are provided at equal angular (60°) intervals, and three positioning grooves 70 are provided at equal angular (120'') intervals at the correct intermediate positions of these radial grooves 23b. When the positions of these positioning grooves 70 are matched, the centers of the plurality of driving side clutch plates 23 and the positions of the radial grooves 23b are matched.

The driving side clutch plate 23 and the driven side clutch plate 25 are assembled using the positioning groove 70. For assembly, the hob 13 before being coupled to the driven shaft 12 and an assembly jig 80 whose shape is shown in FIGS. 16 and 17 are prepared. Assembly jig 8 made of elastic material such as synthetic resin material
0 has three locking claws 81 on its periphery that match the positions of the positioning grooves 70, and has an annular protrusion 82 at its center that fits into the center hole 13a of the hob 13 in a frictional state. . At the tip of the locking pawl 81, a holding protrusion 83 that slightly protrudes inward is formed.

First, the annular projection 82 of the assembly jig 80 is fitted into the center hole 13c of the hob 13. In this state, from the opposite side of the assembly jig 80, the armature 26 is fitted to the piston line 24 on the outer periphery of the hob 13, and then the driving side and driven side clutch plates 23, 25 are alternately fitted on the outer periphery of the hob 13. At this time, the spline groove 25b on the inner circumference of the driven side clutch plate 25 is fitted into the spline 24, and the positioning groove 70 on the outer circumference of the driving side clutch plate 23 is fitted into the locking pawl 81 of the assembly jig 80. Since the retaining protrusion 83 is provided at the tip of the locking pawl 81, the drive-side clutch plate 23 fitted into the locking pawl 81 does not come into contact with the clutch plate 23. When all the clutch plates 23 and 25 are fitted in this way, the state shown in FIG. 17 is obtained, and at this time, the driving side clutch plate 23 is correctly centered, and the position of the radial groove 23b as its axial guide means is , everything will be in place.

As shown in Fig. 17, the hob 13, armature 26. and clutch plates 23 on the driving side and driven side
．． 25 is kept in the assembled state shown in FIG. 2 while being held by the assembly jig 80. That is, the driven shaft 12 is fitted into the coupling spline 13a of the hob 13, and the radial groove 23b on the outer periphery of the driving side clutch plate 23 is fitted into the axial protrusion 22 of the pulley 15. After that, pull out the assembly jig 80,
When the locking pawl 81 and the positioning member 7470 are disengaged and the removal prevention ring 27 is used to prevent the armature 26 from being removed from the hob 13, assembly of the main body portion of the clutch device is completed.

The shape of the assembly jig 80 is determined according to the shape and position of the positioning groove 70 formed in the driving side clutch plate 23. That is, the positioning groove 70 formed in the driving side clutch plate 23 can be used for centering the plurality of clutch plates 23 and for positioning the radial groove 23b, and how to use this is the next problem. . Positioning groove 70
can also be made into a hole, and by using this hole, it is possible to similarly center the plurality of driving side clutch plates 23 and match the positions of the radial grooves 23b.

In addition, in the wet clutch device described above, the oil chamber rotates together with the pulley, and the sealed oil also rotates, so if certain conditions are met, the viscosity of the oil will drive the driven shaft with low torque even in the disconnected state. Can be rotated. Therefore, it is possible to obtain two stages of output torque that differ between the disconnected state and the connected state, and can be used, for example, to drive a supercharger of an internal combustion engine.
I can do it.

The drive shaft 12 becomes a drive shaft of a supercharger (mechanical supercharger) 1o1, as shown in FIG. The supercharger 101 is connected to an air supply passage 103 of an internal combustion engine 102.
It is provided in the output shaft 104 of the internal combustion engine 101 to supply a large amount of air during acceleration (during high load).
and the driven shaft 12 of the supercharger 101 are connected to the pulley 105, the belt 106, and the wet clutch device 10.
connected by. In the conventional clutch device, the air supply path 103 is provided with a bypass path 107 that bypasses the supercharger 101, and when the clutch device is off, it is necessary to supply air through this bypass path 107. However, according to the present wet clutch device 10, the supercharger 101 can be driven with low torque even when the clutch device 10 is off, and therefore the bypass passage 107 can be omitted. Note that in FIG. 18, 108 indicates an air filter.

In this example, the amount of oil sealed in the oil chamber 21,
The armature 26 and the outer diameter of the driven side clutch plate 25 are determined such that the driven shaft 12 rotates in the disconnected state. That is, the oil sealed in the oil chamber 21 whose outer periphery is formed by the pulley 15 is annularly positioned around the periphery of the oil chamber 21 due to centrifugal force.

Now, if the inner peripheral level of this annular oil is OL (Fig. 2), the armature 26 and the driven clutch plate 25 are as follows.
Its outer diameter portion is immersed in this annular oil O, and as a result, when the pulley 15 is rotated in a disconnected state in which the coil 30 is not energized, the viscosity of the oil causes the driven side to move through the armature 26 and the driven side clutch plate 25. The shaft 12 is set to rotate. The amount of sealed oil is determined in consideration of the balance between lubricity and connectivity.

Therefore, according to this wet clutch device, the coil 30
When the pulley 15 is rotated by the internal combustion engine 102 in a disconnected state in which no current is applied to the pulley 15, the oil chamber 21 and the oil therein rotate and form an annular shape. Then, the outer periphery of the armature 26 and the driven side clutch plate 25 is given a rotational force by the viscosity of this rotating annular oil 0, and as a result,
The driven shaft 12 rotates via the hob 13. Therefore, supercharger 101 can send an amount of air to internal combustion engine 102 according to its rotation speed. Graph a in FIG. 19 shows the pulley 15 and driven shaft 12 in this disconnected state.
An example of the rotation speed is shown.

On the other hand, when the coil 30 is energized, the amateur 26
is attracted to the pulley 15 side. Due to this suction force, the driving side clutch plate 23 and the driven side clutch plate 25 come into strong contact and rotate together, and together with the driven side clutch plate 25, the hob 1
3 and driven shaft 12 rotate. That is, the pulley 15 and the driven shaft 12 rotate together, and the supercharger 101 then sends a large amount of air to the internal combustion engine 102 (graph b in FIG. 19). Note that the diagram C in FIG. 19 shows the change in the rotational speed when transitioning from the non-connected state a to the connected state. Connections are made smoothly.

Rotation speed of driven shaft 12 in disconnected state (output torque)
is determined by the degree of immersion of the armature 26 and the driven side clutch plate 25 into the oil and the viscosity of the oil.Furthermore, a fin is provided on the outer circumference of the armature 26 at the portion immersed in the oil 0 to increase the output torque. It is possible to provide grooves or grooves. FIG. 20A shows an embodiment in which fins 91 are provided, and FIG. 20B shows an embodiment in which grooves 92 are provided.

By providing the fins 91 and grooves 92 in this way, it is possible to increase the number of rotations taken out to the driven shaft 12 in the disconnected state as shown in FIG. 19a. Fin 91 and groove 9
The direction and number of 2 can be determined depending on the output torque required in the disconnected state.

In the above embodiments, the pulley 15 is described as the driving side and the driven shaft 12 is used as the driven side, and this usage is common in practice. is available. In the main text and claims, a driving side and a driven side have been distinguished for convenience in order to clarify the structure, but this does not mean that the present invention does not include such a method of use.

Furthermore, the present invention is similarly applicable to electromagnetic wet clutch devices other than the electromagnetic wet clutch devices shown in the above embodiments.

``Effects of the Invention'' As described above, the present invention has the driven side rotating member that supports the inner peripheral part of the driven side clutch plate of the electromagnetic wet clutch device made of a non-magnetic material, so that leakage of magnetic flux caused by electromagnetic means is prevented. It can be connected with strong magnetic attraction force. And since this non-magnetic material is subjected to nitrocarburizing treatment,
It is possible to improve RWA characteristics and sliding characteristics with the driven side clutch plate, prevent sliding scratches and deformation of the clutch plate, shorten connection time, and improve durability.

[Brief explanation of the drawing]

1A and 1B are a front view and a vertical sectional view of a driven rotating member of a wet clutch device according to the present invention, and FIG. 2 is an upper half sectional view and a vertical sectional view showing an example of a wet clutch device to which the present invention is applied. 3 and 4 are sectional views of different embodiments taken along the line ■-■ in FIG. 2, and FIGS. 5A and 5B are sectional views showing other examples of oil passages formed in armatures, respectively. Figures 6 and 7 are the Vl-Vl line in Figure 2, ■-■
It is a sectional view along a line. Figure 8 is a perspective view of the plug attached to the cover, Figure 9,
Figure 0 is a front view and back view showing an example of a pattern of oil drain grooves attached to the driven side clutch plate, Figure 11 is a plan view showing an example of a pattern of oil drain grooves attached to the driving side clutch plate, and Figure 12 is a matte finish surface. Figures 13 and 14 are plan views showing other patterns of oil discharge grooves attached to the clutch plate, and Figure 15 is a drive side clutch with positioning grooves. A plan view of the plate, FIG. 16 is a perspective view of a jig used for sub-assembly using the positioning groove of the driving side clutch plate in FIG. , Fig. 18 is a system connection diagram using the wet type clutch device shown in Fig. 2 as a clutch device for a supercharger of an internal combustion engine, and Fig. 19 shows the relationship between the rotation speed of the supercharger and the rotation speed of the pulley shown in Fig. 18. The graphs shown in FIGS. 20A and 20B are perspective views showing examples of fins or grooves formed in the armature to increase the extraction torque in the disconnected state. 11... Housing, 12... Driven shaft (driven side rotating member), l 3... Hob (driven side rotating member), 13b...
... Hardened layer, 14... Bearing, 15... Pulley (driving side rotating member), 16... Oil seal, 18-... Fixing screw, 20... Cover (driving side rotating member), 21 −・
・Oil chamber, 22--Axial projection, 23--Driving side clutch plate, 24--Spline, 25--Driving side clutch plate, 26--Amateur, 28--Annular groove, 29 --Bracket, 30--Coil, 31--
Magnetic path forming hole, 32 = - sealing material.

Claims (4)

[Claims] (1) Inside the oil chamber, there is a driving side clutch plate that is movable in the driving side rotation member in the axial direction and supports its outer circumference, and a driven side clutch plate that is movable in the driven side rotation member and supports its inner circumference while being movable in the axial direction. In an electromagnetic wet clutch device in which clutch plates are arranged alternately in a laminated manner and electromagnetic means is provided to apply adhesion force to the driving side and driven side clutch plates, the driven side rotating member is subjected to nitrocarburizing treatment. An electromagnetic wet clutch device characterized in that it is constructed from a non-magnetic material. (2) The electromagnetic wet clutch device according to claim 1, wherein the driven side rotating member is made of stainless steel material, which is subjected to nitrocarburizing treatment. (3) In claim 1 or 2, the oil chamber includes a pulley that is a driving-side rotating member located on the outer periphery of the driven shaft, and a driven-side rotating member located at the center of the pulley. An electromagnetic wet clutch device consisting of a pulley and a cover integrally formed. (4) In claim 3, the driven rotating member comprises a driven shaft and a hob fixed to the driven shaft, a driven clutch plate is supported by the hob, and the hob is subjected to nitrocarburizing treatment. An electromagnetic wet clutch device made of stainless steel material.