JP2617206B2 - Viscous fluid coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a viscous fluid coupling in which torque is transmitted using shear resistance of a viscous fluid between plates with holes connected to an input / output shaft. The device relates to an arrangement of perforated plates, in particular.

[Prior Art] A viscous fluid (silicon oil) is filled between a perforated plate composed of an inner plate and an outer plate connected to an input / output shaft, respectively, and torque is transmitted using the shear resistance of the viscous fluid. Such viscous fluid coupling (viscus coupling) devices are known (see, for example, U.S. Pat. No. 4,022,084).

[Problems to be Solved by the Invention] In this viscous fluid coupling device, in order to increase the hump torque obtained when the perforated plates are directly connected to each other, conventionally, the dimensions of the components of the viscous coupling and the silicone oil The viscosity and volume ratio were changed.

Changes in component dimensions, oil viscosity and volume ratio require high precision management.

Therefore, an object of the present invention is to provide the dimensions of parts, the viscosity of a viscous fluid,
It is an object of the present invention to provide a viscous fluid coupling device capable of increasing the hump torque by devising the arrangement of the perforated plates without changing the volume ratio.

[Means for Solving the Problems] In order to achieve the above object, the present invention relates to a method of connecting an inner plate 15 to one of input / output shafts 1 and 9 and an outer plate 12 to the other. In the viscous fluid coupling device 10 that transmits torque by using the shear resistance of the viscous fluid 19 between the 15, the inner plate 15 and the outer plate 12 have a plurality of holes 1 at predetermined circumferential intervals.
3 and 16 are formed, and the holes 13 and 16 are formed at one end 1 on one opening surface side.
While the diameters of 3t and 16t gradually increase, the ends 13e and 16e on the other opening side have a hole shape that does not increase in diameter, and the inner plate 15 and the outer plate 12 have the same hole end. 13t,
The surfaces having the 16t, 13e, and 16e shapes are arranged to face each other, and one of the inner plate 15 and the outer plate 12 is fixed in the axial direction, and the other is movable in the axial direction.

[Operation] In the rotating state, an axial pressing force acts on the enlarged diameter portions 13t and 16t of the holes 13 and 16 of the inner plate 15 and the outer plate 12 due to the shear resistance of the viscous fluid 19. The plate 12 movable by this pressing force approaches the fixed plate 15 side. The ends of the holes 13 and 16 that open to the surfaces of the plates 12 and 15 on the sides closer to each other are corners 13e and 16e that do not increase in diameter, so that it is easy to cut the viscous fluid oil film on the plate surface when humped. , Or because it is easy to make thin, the transmission force between both plates 12, 15 increases. This increases the hump torque.

Embodiment An embodiment will be described below with reference to the accompanying drawings.

In FIG. 1 showing an example of a viscous fluid uplink device to which the present invention is applied, 1 is an input shaft, 9 is an output shaft,
The viscous fluid coupling device 10 of the present invention is provided between the input shaft 1 and the output shaft 9.

That is, the flange 2 at the end of the input shaft 1 is fixed in one end of the cylindrical case 3, and the output shaft 9 is inserted into the end of the input shaft 1 from the cover 4 fixed in the other end of the cylindrical case 3. ,
Bearings 5 and 6 and seal rings 7 and 8 are interposed between the output shaft 9, the input shaft 1 and the cover 4.

In the cylindrical case 3, a number of outer plates 12 and inner plates 15 are arranged alternately one by one in the axial direction, and a high-viscosity fluid (silicon oil) 19 is filled and sealed. That is, the outer plate 12 is attached to the inner periphery of the cylindrical case 3 by the spline fitting portion 11 so as to be integral with the rotation direction and to be movable in the axial direction. The inner plate 15 has a similar spline fitting part on the outer circumference of the output shaft 9.
14 are assembled so as to be axially movable in the direction of rotation, but between the inner circumferences of adjacent inner plates 15.
Rings 17 are interposed, whereby the inner plate 15 is fixed in the axial direction.

In the above, each of the outer plate 12 and the inner plate 15 is formed with a large number of holes 13,..., 16 at predetermined intervals in the circumferential direction. The hole processing is, for example, as shown in FIG. 5, that is, the holes 13 and 16 are punched and formed at predetermined positions of the plates 12 and 15. The ends of holes 13 and 16 in the punching direction are tapered enlarged portions 13t and 16t whose diameter gradually increases toward the opening surface side, and the ends of holes 13 and 16 in the punched direction are imaginary lines. The burrs indicated by mark remain. The burrs are removed in the next step, and the ends of the holes 13 and 16 on the other opening surface side are formed into right-angled edge-shaped corners 13e and 16e that do not increase in diameter.

The outer plate 12 and the inner plate 15 thus formed with holes are tapered as shown in FIG.
13t and 16t and the edge-shaped corners 13e and 16e are opposed to each other and arranged alternately in the axial direction.

According to the viscous fluid coupling device 10 in which the perforated plates are arranged as described above, the silicone oil 19 on both sides of the outer plate 12 that is axially movable in the rotating state.
When the pressure gradually increases from a state in which the pressure due to the shear resistance (usually substantially atmospheric pressure in the differential rotation state) is uniform, the pressure axis acting on the tapered enlarged portion 13t surface of the plate hole 13 Arrow F in FIGS. 3 and 4 due to the directional component force
The outer plate 12 is pressed and moved in the axial direction indicated by.

Due to the movement of the outer plate 12, the surface on the side close to the inner plate 15 fixed in the axial direction becomes the holes 13, 16 respectively.
On the side of the edge-shaped corners 13e and 16e. Tapered enlarged diameter part 13
Compared to the t and 16t sides, the edge-shaped corners 13e and 16e sides are easier to cut or thin the viscous fluid oil film on the plate surface, so the transmission force between both plates 12 and 15 is improved. I do.

Since the transmission force between the two plates 12 and 15 in the humped state is increased in this manner, the hump torque of the picus coupling can be increased as compared with a case where the plates are randomly arranged.

In the above, the tapered enlarged portion generated in the hole punching step of the plate is used, but it is also possible to form the same enlarged portion by chamfering positively.

The relationship between the input and output shafts and the relationship between the fixing and movement of the two plates may of course be the reverse of the embodiment. The hole shape of the plate may be a radial slit shape.

[Effects of the Invention] As described above, according to the present invention, the hump torque of the viscous fluid coupling device can be easily increased by merely devising the arrangement of the perforated plates, and the component dimensions and the viscosity of the viscous fluid can be easily increased. There is no need to change the volume ratio.

[Brief description of the drawings]

FIG. 1 is a central sectional view showing an example of a viscous fluid coupling device to which the present invention is applied, FIG.
The figure is an enlarged sectional view for explaining the operation, FIG. 4 is an enlarged view for showing the function of the moving force, and FIG. 5 is an enlarged sectional view for explaining the drilling. In the drawings, 1, 9 are input / output shafts, 3 is a case, 10 is a viscous fluid coupling device, 11, 14 are spline fitting portions, 12
Is an outer plate, 13 is a hole, 13t is an enlarged portion, 13e is a corner, 15 is an inner plate, 16 is a hole, 16t is an enlarged portion, 16e
Is a corner, 17 is an O-ring, and 19 is a viscous fluid.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroyuki Makino 1-4-1 Chuo, Wako-shi, Saitama Pref. Honda Technical Research Institute Co., Ltd. (56) References JP-A-1-153824 (JP, A) Sho Akai 62-128231 (JP, U)

Claims (1)

(57) [Claims] 1. A viscous fluid coupling device for connecting an inner plate to one of input / output shafts and an outer plate to the other, and transmitting torque by using shear resistance of a viscous fluid between the two plates, A plurality of holes are formed in the inner plate and the outer plate at predetermined intervals in the circumferential direction, and the holes gradually increase in diameter at one opening surface side, while the other opening surface side expands the diameter. The end of the hole has a hole shape that does not expand, and the inner plate and the outer plate are arranged with the surfaces of the same hole end shape facing each other, and one of the inner plate and the outer plate is axially fixed. A viscous fluid coupling device, characterized in that the other is movable in the axial direction.