JPH0331863Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to the structure of a magnetic particle electromagnetic coupling device, particularly to prevention of grease inflow into spline joints and prevention of water intrusion from the outside.

[Prior art]

Hereinafter, a conventionally proposed magnetic particle type electromagnetic coupling device will be explained with reference to FIG. In the figure, reference numeral 1 denotes a drive member which is a first connection main body, and has a connection surface 1a on its inner circumference, and a mounting plate 1b on its outer circumference, which is connected to a drive source such as an engine (not shown). 2 is a connecting surface 2a that faces the connecting surface 1a of the drive member 1 in the radial direction with an annular gap _g1 in between.
A driven member that is a second connecting entity having
3 is a magnetic particle sealed in the annular gap between the connecting surfaces (between 1a and 2a); 4 is a bobbin attached to the annular groove 1c of the drive member 1; 5 is a bobbin wound around the bobbin 4; An electromagnetic coil magnetizes the particles 3 to control the connection state between the drive member 1 and the driven member 2, and 6 is a cylindrical output shaft fixed to the inner circumference of the driven member 2 with a bolt 101. It has a hole spline 6a. Reference numeral 7 denotes a slip ring for supplying power to the electromagnetic coil 5, which is connected to the coil 5 by a lead wire (not shown). 8 is a bracket whose outer circumferential portion is fixed to the drive member 1 with bolts 9; 10 is a bearing that rotatably supports the driven member 2 and the drive member 1 via the bracket 8; the outer ring thereof is a support 11; The bracket 8 is fixed to the bracket 8 by a bolt 12, and the inner ring thereof is fixed to the rotating shaft 6 by a tow 13. Reference numeral 14 denotes a disk-shaped plate fixed to the side of the drive member 1 opposite to the bracket 8 by caulking or the like, and has an annular opening on its inner circumference. 15 is a first labyrinth fixed to the plate with rivets 102; 16 is a plate member which is a cylindrical member fixed integrally with the output shaft 6 by the bolts 101; An annular gap g ₂ in the inner peripheral part 14a and in the radial direction
The protrusion outer circumferential surface 16a faces each other via the protrusion outer circumferential surface 16a, and the protrusion end surface 16b of the protrusion outer circumferential surface 16a protrudes outward (toward the side opposite to the bracket 8) from the inner circumferential surface 14a of the plate 14. Further, the plate member 16 has an opening 16c having a smaller diameter than the small diameter of the hole spline 6a of the output shaft 6. 103 is attached with bolts 104 and 105, and is connected to the drive shaft 100.
105 is a spline shaft which has the output shaft 6 and the shaft spline 105a and is connected to a load such as a transmission (not shown); 106 is a magnetic particle type electromagnetic A shaft 107 that transmits engine power from the drive shaft 100 to a load such as an oil pump (not shown) without passing through a coupling device is grease applied to the spline joint.

As is well known, the operation of this embodiment is based on the drive shaft 100.
Since the magnetic particles 3 are not magnetized when the electromagnetic coil 5 is deenergized while the motor is rotating, no torque is transmitted from the drive member 1 to the driven member 2, and therefore the driven member 2 and the output shaft 6 are stationary. There is. Next, when the electromagnetic coil 5 is energized, the magnetic particles 3 are magnetized and torque is transmitted from the drive member 1 to the driven member 2, so that power from the engine (not shown) is transmitted to the output shaft 6 and the hole is spline 6a and spline shaft 1
The transmission is driven via 05.

Due to slip heat during driving, heat generated by the electromagnetic coil 5, and heat conducted from peripheral devices (engine, transmission, etc.), the temperature of the spline joints 6a, 105a increases and the applied grease softens. This softened grease or water from the outside travels between the inner circumferential surface 16c of the protruding portion and the shaft and reaches the end surface 1 of the protruding portion.
6b due to the centrifugal force of rotation or gravity, and there is a drawback that what is transmitted to the outer periphery of the outer circumferential surface 16a of the protruding portion enters into the space A due to the centrifugal force or gravity.

[Summary of the idea]

This invention was made with the aim of improving this drawback, and by configuring the opening of the cylindrical member to expand outward in the axial direction, the magnetic particle type electromagnetic coupling prevents the intrusion of grease and water. This paper proposes a device.

[Example of idea]

FIG. 2 is a cross-sectional view showing an embodiment of this invention, in which numerals 1 to 15, 100, and 105 to 107 are the same as the conventional device described above. 17 is the above output shaft 6
is a cylindrical member fixed to the end face of the plate 14 by electron beam welding, and has an opening 17a having a diameter smaller than that of the spline 6a for the hole of the output shaft 6, and has an opening 17a that is connected to the inner peripheral part 14a of the opening of the plate 14. A cylindrical portion 17b is provided to face each other in the radial direction with an annular gap _g2 interposed therebetween, and the cylindrical portion 17b is configured to expand outward in the axial direction, that is, to expand in the direction of increasing the diameter. It consists of an opening 17c.

In the magnetic particle type electromagnetic coupling device configured as described above, the opening 17c that expands in the direction of increasing the diameter enhances the scattering effect due to centrifugal force when rotating, and also maintains a cylindrical shape even when stationary. It flows down the groove shape formed by the outer peripheral surface of the portion 17b and the opening 17c according to gravity, and falls into the external space B from the end of the opening 17c which is the lowest part.

Note that the surface of the cylindrical member 17 is coated with a heat-resistant member having a large contact angle. Here, the contact angle refers to the angle α between the liquid surface and the solid surface (cylindrical member) where the free surface of the stationary liquid meets the solid wall. The contact surface between the material and the solid surface (cylindrical member) becomes small, and it becomes easy to scatter from the solid surface in the form of oil droplets or water droplets. By coating a heat-resistant member with a large contact angle, such as Teflon coating, the grease and water that adhere to the cylindrical member 17 form oil droplets and water droplets on the surface of the cylindrical member 17, so that they spread over the surface and penetrate. This can be significantly prevented. In other words, when rotating, it is drop-shaped and easily scattered by centrifugal force, and when stationary, it falls into the external space B due to gravity, or even if it is a small amount and does not fall, it spreads over the surface and does not penetrate.
This means that the adhesive remains in the form of drops.

[Effect of idea]

As explained above, this invention has the effect of preventing the intrusion of grease and water by configuring the opening of the cylindrical member to expand outward in the axial direction.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional magnetic particle type electromagnetic coupling device, and FIG. 2 is a sectional view showing an embodiment of this invention. In the figure, 1 is a drive member, 2 is a driven member, 3 is a magnetic particle, 5 is an electromagnetic coil, 14
17 is a plate, 17 is a cylindrical member, 17a is an opening, 17b is a cylindrical part, and 17c is an opening. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) First and second connecting bodies facing each other via a connecting gap in which magnetic particles are enclosed, a magnetic flux flowing through the connecting gap to solidify the magnetic particles, an electromagnetic coil for connecting the first and second connecting bodies, coupled to the second connecting body so as to be capable of transmitting torque;
a cylindrical output shaft having a spline joint on a part of its inner periphery; a disc-shaped plate fixed to one side of the first connecting body and having an annular opening on its inner periphery; and an opening in the plate. a cylindrical part that protrudes from the inner periphery of the plate through a gap, has an inner diameter smaller than the small diameter of the spline of the output shaft, and has an opening that expands outward in the axial direction from the opening of the plate; What is claimed is: 1. A magnetic particle type electromagnetic coupling device comprising: a cylindrical member integrally formed with the output shaft; (2) The magnetic particle type electromagnetic coupling device according to claim 1, wherein the surface of the cylindrical member is coated with a heat-resistant member having a large contact angle. (3) The magnetic particle according to claim 1 or 2 of the utility model registration claim, characterized in that the cylindrical member is formed from a plate shape by press working, and is integrally formed with the output shaft in a sealed state. type electromagnetic coupling device. (4) The magnetic particle type according to any one of claims 1 to 3 of the utility model registration claim, characterized in that an electron beam welding method is used as a means for integrally forming the cylindrical member and the output shaft. Electromagnetic coupling device.