JPH0238723A - Viscous fluid clutch - Google Patents

Abstract

PURPOSE:To let a vehicle come out of a slipping condition quickly as well as to improve the durability of a clutch by letting No.1 and No.2 resisting section be composed of piled-up sections wherein each section is piled up one another, and of supporting sections supporting said piled-up sections respectively. CONSTITUTION:No.1 resisting section 25 and No.2 resisting section 26 are composed of piled-up sections 25a and 26a wherein each section is piled up one another, and of supporting sections 25b and 26b supporting the piled-up sections 25a and 26a, which are inclined in such a way as to be separated from a relative rotating center line CL as the supporting sections come close to the piled-up sections 25a and 26a. This constitution allows a vehicle to come out of a slipping condition quickly, thereby making it possible to improve the durability of a viscous fluid clutch.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) This invention relates to a viscous fluid clutch that transmits torque through shear resistance of viscous fluid.

(Prior Art) As a conventional viscous fluid clutch, there is one shown in FIG. 5, for example (see Japanese Patent Laid-Open No. 106130/1986).

In Figure 5, 1011! ! ! Dynamic (input) axis, 10
Reference numeral 2 denotes a sleeve that is spline-fitted to the drive shaft 101 and is fitted so as to be movable in the axial direction.The sleeve 102 has a flange portion 103 integrally formed therein, and each flange portion 103 has a diameter. A plurality of drive-side cylinders 104 having different diameters are attached concentrically about the centerline of the sleeve 102 at predetermined intervals.

Reference numeral 105 denotes a housing rotatably mounted on the drive shaft 101, and a center hole in one side wall 106 of the housing 105 is fitted so as to be rotatable and axially openable relative to the outer peripheral surface of the sleeve 102. The driving cylinder 1O4 provided in the sleeve 102 is assembled so that it can move within a predetermined range in the axial direction within the housing 105 by activating the sleeve 102 in the axial direction.

A plurality of driven-side cylinders 108 having different diameters are concentrically attached to the other side wall 107 of the housing 105, and the plurality of driven-side cylinders 108 and the plurality of driving-side cylinders 104 are installed in the housing 105. They have a shape in which they are alternately overlapped concentrically at predetermined minute intervals. Further, slits (not shown) are formed in each of the driving side cylinder 104 and the driven side cylinder 108. A highly viscous liquid is sealed within the housing 105 .

When the drive shaft 101 and the housing 105 rotate relative to each other,
The viscous fluid is sheared by the driving cylinder 104 and the driven cylinder 108, and the shearing force at this time is transmitted to the housing 105 as torque.

(Problem to be Solved by the Invention) However, in such a conventional viscous fluid clutch, the viscous fluid is sheared by the relative rotation of the drive shaft 101 and the housing 1Q5, but at this time, the viscous fluid is Between the side cylinders 104 and the plurality of driven side cylinders 108
pushed between.

Further, the viscous fluid is gradually pushed toward the outer circumference through these slits by the centrifugal force. In this way,
The viscous fluid is distributed between the driving cylinder 104 on the outermost circumferential side and the inner cylinder 11 on the driven side.
When pushed to 1108, even if the housing 105 is filled with viscous fluid at a high filling rate, the viscous resistance of the viscous fluid between the driving cylinder 104 and the driven cylinder 108 on the inner peripheral side becomes low. Therefore, there is a problem that the shear force of the viscous fluid decreases as a whole, and the torque transmitted from the drive shaft 101 to the housing 105 decreases.

On the other hand, since the driving side cylinder 104 and the driven side inner m'+08 are cylindrical, their rigidity is low, and this viscous fluid clutch has a problem in that its durability is slightly reduced.

(Means for Solving the Problems) To solve such problems, the present invention includes a first rotating member and a second rotating member that are arranged to be relatively rotatable; A first resistance part and a second resistance part are provided in each of the second rotating members, and the first resistance part and the second resistance part extend in the direction of the relative rotation center line and can overlap each other alternately.
A viscous fluid clutch comprising a resistance part and a working chamber filled with a viscous fluid sheared by the second resistance part,
The first resistance part and the second resistance part each include an overlapping part and a supporting part that supports the overlapping part, and each supporting part is separated from the center line of relative rotation as it approaches the overlapping part. The structure is tilted as shown in the figure.

(Operation) When the first rotating member and the second rotating member rotate relative to each other, the viscous fluid is sheared and rotated by their overlapping portions. Here, the viscous fluid is guided to the support part by the centrifugal force and collected near the mating part. Therefore, the shearing force of the viscous fluid sheared by the overlapping portion increases, and the torque transmitted between the IT1 rotating member and the second rotating member increases.

(Example) The present invention will be explained below based on the drawings.

1 to 4 are diagrams showing an embodiment of a viscous coupling according to the present invention. This embodiment is an example in which a viscous fluid clutch is interposed between the front wheel drive shaft and the contact wheel drive shaft of an FF-based four-wheel drive vehicle.

First, the configuration will be explained. In Fig. 1, 1 is internal combustion tlr
IA, the torque output from the internal combustion engine 1 is transmitted to the transmission 3 via the clutch 2. Torque is transmitted from the drive gear 4 of the transmission 3 via the ring gear 5 to the front wheel differential a gear mechanism n6, and then to the left wheel drive shaft 7a and right wheel drive shaft 7b of the front wheel portion 11J11117. The torque transmitted to the differential case 8 of the differential gear mechanism 6 is transmitted to the power transmission gear 9, and the direction is changed at right angles by the direction changing gear set 10a of the transfer 10. The torque whose direction has been changed at right angles is transmitted to the propeller shaft 12 via the viscous fluid clutch 11, and then transmitted from the drive pinion 13 to the rear wheel side differential tooth width mechanism 15 via the ring gear 14, and then to the rear wheel drive shaft. 16 left wheel drive @ 16a and right wheel drive shaft 16b.

The viscous fluid clutch 11 will be explained with reference to FIG. 17
is a first rotating member spline-coupled to the output shaft (drive shaft) of the transfer 10, and this first rotating member 17 includes a hollow shaft portion 18 located on the outer peripheral side of the output shaft and an outer peripheral wall of this hollow shaft portion 18. The flange portion 19 is fixed to the flange portion 19. A second rotating member 2o is disposed on the outer peripheral side of the first rotating member 17 so as to be rotatable relative to the first rotating member 17. The second rotating member 20 is in close contact with the hollow shaft portion 18 so as to be relatively rotatable, and is composed of the hollow shaft portion 18, a shaft portion 21 coaxial with the hollow shaft portion 18, and a substantially cylindrical case portion 22. A side wall member 23 is attached to the right end of the case portion 22 in the drawing, and is in close contact with the hollow shaft portion 18 so as to be relatively rotatable.

The first rotating member 17 and the second rotating member 20 are relatively rotatable about the axes (C, L) of the shaft portion 21 and the hollow shaft portion 18. Here, the shaft portion 21, the case 1222, the steel wall member 2
3 and the hollow @ part 18 define a working chamber 24, and this working chamber 24 is filled with silicone oil as a viscous fluid.

A flange portion 19 of the first rotating member 17 is located in the working chamber 24, and a first resistor portion 25 and an IT2 resistor 8026 are provided on each opposing wall surface of the flange portion and the shaft portion 21. There is. That is, the support plate 27 attached to the shaft portion 21 with bolts has an axis (C,
A plurality of substantially cylindrical second resistance portions 26 extending in the L) direction and having different diameters are attached to overlap in the radial direction. On the other hand, the flange portion 19 has an axis Nl21 in the direction of the axes (C, L).
A plurality of substantially cylindrical first resistance portions 25 extending toward the radial direction and having different diameters are attached in a stacked manner in the radial direction. The first resistance portion 25 and the second resistance portion 26 are overlapped portions 25a that alternately overlap.

26a, and support portions 25b and 261 that support the overlapping portions 25a and 26a. Polymerization part 2
5a and 26a are arranged parallel to the axis (C, L) direction, and the supporting portion 2511.26b is the combination portion 25.
a and 26a, it is formed so as to be inclined away from the axes (C, L) (center line of relative rotation). As shown in FIG. 3, the first resistance part 25 has a slit 25c along the axis (C, L) from the distal end to the middle of the proximal end.
A plurality of support portions 251 are formed in the direction, and these support portions 251
+ is provided with a build portion 25d press-molded in the circumferential direction, as also shown in FIG. The second resistance section 26 is similarly provided with a slit (not shown) and a bead section (not shown). In addition, although one flange portion divides the inside of the working chamber 24, a communication hole 28 that communicates the divided chambers is provided.
is formed on this flange portion 19.

Next, the effect will be explained. When the vehicle travels straight on a tR road, the torque of the engine 1 is transmitted from the transmission 3 to the front wheel drive shaft 7 and the transfer 10, but a viscous fluid clutch 11 is provided between the transfer 10 and the propeller shaft 12. There is a propeller shaft 1
Almost no torque is transmitted to the second side, and the vehicle runs almost as a front-wheel drive vehicle. At this point, the first
The rotating member 17 and the second rotating member 20 rotate at the same time.

Next, when the front wheels slip when the vehicle is driving on a rough road with a small coefficient of road friction, the front wheel layer will slip! The first rotating member 17 connected to the lJ shaft 7 is driven by the engine 1 in an M-contact manner, but since the resistance of the front wheels is low, only a small amount of torque is transmitted to the front wheels. Here, since the rear wheels are rotating less than the engine side rotation speed (front wheel drive shaft), the second rotating member 20 connected to the rear wheel drive shaft 16 rotates less than the first rotating member 17. Therefore, a difference in rotational speed occurs between the front wheel drive shaft 7 and the rear wheel drive shaft 16, that is, between the first rotation member 17 and the second rotation member 20, and the first resistance portion 25 and the second resistance portion It rotates relative to 26.

At this time, the silicone oil is sheared by the overlapping portion 25a of the first resistance portion 25 and the overlapping portion 26a of the second resistance portion 26, and is rotated within the working chamber 24. The silicone oil is rotated, and due to its centrifugal force, it is guided by the inclined support portions 2511 and 26b, and also by the bead portion 25d to form the overlapping portion 25a.

26a, and is collected near the overlapping portions 25a and 26a. For this reason, the silicone oil is
Pushed between 5b and 26b, roughly - slit 2
5c and is prevented from gradually moving toward the outer circumferential side.

Therefore, silicone oil has polymerized portions 25a, 26
Since the silicone oil is collected in the vicinity of a, the shearing strength of the silicone oil is thereby improved.

In this way, the shearing force of the silicone oil becomes large, so this large shearing force can be quickly transmitted as torque from the rear wheel drive shaft 16 to the rear wheels. In other words, the responsiveness of torque transmission to the rear wheels can be improved.

As a result, the rear wheels of the vehicle are pushed out, allowing the front wheels to quickly escape from the slipping state.

By the way, when the first rotating member 17 and the second rotating member 20 are relatively moved in the axis (C, L) direction, the widths of the overlapping portions of the overlapping portions 25a and 26a differ. If the width of the overlapping portions of the overlapping portions 25a and 26a is varied in this way, the shearing force of the silicone oil will be different. Therefore, the first rotating member 1
By relatively moving the second rotary member 7 and the second rotating member, the torque can be made to have a desired characteristic, and the vehicle can run stably.

Note that when parking in a garage, etc., there will be a difference in rotational speed between the front wheel drive shaft and rear wheel drive shaft, and between the left and right wheels, but this rotational speed difference is absorbed by the viscous fluid clutch 11, so it will stay tight. It is possible to prevent the corner braking phenomenon from occurring.

On the other hand, the axis line (
Since the overlapping portions 25a, 26a parallel to C, L) and the inclined support portions 25b, 25b are provided, the cross-sectional shape is different from the conventional example, and the bead portion 2 is provided in the support portions 25b, 26b.
5d, the rigidity of the first and second resistance parts 25 and 26 is increased, and the durability of the viscous fluid clutch 1 is improved.

[Effects of the Invention 1] As explained above, according to the present invention, the first resistance part and the second resistance part each include an overlapping part and a support part that supports this overlap part, and each of the support parts The viscous fluid filled in the working chamber is guided by the centrifugal force to the supporting part and sent to the overlapping part. The shearing force of the viscous fluid being sheared increases. Therefore, when this viscous fluid clutch is installed in the power transmission line of an automobile, the shear resistance of the viscous fluid can be instantly increased, and a large torque can be quickly transmitted to the wheel with a higher coefficient of friction. Can be done. That is, it is possible to improve the responsiveness of torque transmission to wheels with a high 1tIn coefficient and the transmission torque.

As a result, it is possible to quickly get the vehicle out of a slipping state. Furthermore, since the rigidity of the first and second resistance parts is improved, the durability of the viscous fluid clutch can be improved.

[Brief explanation of the drawing]

1 to 4 are diagrams showing one embodiment of a viscous fluid clutch according to the present invention, and FIG. 1 is an overall schematic diagram of this viscous fluid clutch arranged in a power transmission system of a four-wheel drive vehicle;
Figure 2 is a cross-sectional view of this viscous fluid clutch, and Figure 3 is a cross-sectional view of this viscous fluid clutch.
The first resistor section in the figure is viewed from the ■ arrow, and Figure 4 is the rV-rV line in Figure 3! FIG. FIG. 5 is a sectional view showing a conventional viscous fluid clutch. 17... First rotating member 20... Second rotating member 24
... Working chamber 25... First resistance part 26... Second resistance part 25a, 26a... Overlapping portions 25b, 26b.
...Supporting parts C, L...Relative rotation center line agent Patent attorney Yasuo Miyoshi 17...1st rotation S material 20...2nd @ rotation Igl shrine 24...Sakubi I 25. ...No. 11! Pile part 26...
・Second resistance part 25a, 26a-+1 joint part 25b
, 26b...Supporting parts C, L...Relative rotation center line Fig. 1 Fig. 4

Claims (1)

[Claims] (1) A first rotating member and a second rotating member arranged to be relatively rotatable, and each of the first rotating member and the second rotating member extending in the direction of the relative rotation center line and alternately overlapping each other. In the viscous fluid clutch, the viscous fluid clutch is provided with a first resistance part and a second resistance part, which are capable of The first resistance part and the second resistance part each include an overlapping part and a supporting part that supports the overlapping part, and each supporting part is separated from the center line of relative rotation as it approaches the overlapping part. A viscous fluid clutch characterized by being inclined at a slant.