JPH0389032A - Hydraulic friction clutch - Google Patents

Abstract

PURPOSE: To eliminate a spacer ring, and achieve satisfactory spacing of plates by bending a specified number of teeth among a number of teeth in each plate on the side without axially sliding in the form of Z, and setting bend angles at two positions to be about 90 deg.. CONSTITUTION: A number of inner plates 6 and outer plates 7 are alternately disposed in a specified order in an inner chamber 11 of a clutch casing 2, and in this case, a specified number in teeth 9 in each outer plate 7 are formed as teeth 8 bent in the form of Z to have a space to the adjacent outer plate 7. A gap 12 is formed between the inner plate 6 and the outer plate 7, and the inner plate 6 axially slides in the gap 12. Each outer plate 7 is spaced by the Z-bent teeth 8. The Z-bent tooth 8 is in contact with the non-bent tooth 9 of the adjacent outer plate 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention is a liquid friction clutch comprising at least one clutch hub and one clutch casing rotatably supported on the clutch hub; The plates of a plurality of plate sets are connected to the crankshaft and the clutch casing in a fixed order and alternately through teeth in a relatively unrotatable manner, and each plate of one plate set is connected at a predetermined axial distance from each other. , and each plate of the other plate set is of the type that is slidable in the axial direction.

[Conventional technology]

In the case of liquid friction clutches of this type, known for example from DE 38 28 421 C1, so-called spacer rings of a certain thickness are used to maintain the distance between the plates. This spacer ring is slit and has an outer diameter slightly larger than the inner diameter of the clutch casing, so that it can contact the inner wall of the casing with initial tension. but,
The drawback is that it is not possible to assemble the plates automatically.
Even if it were possible, it would require significant costs. The individual plates are therefore assembled manually.

According to US Pat. No. 3,058,027 it is known to bend some of the teeth of the plate to provide an elastic return effect. However, such bending is inconvenient for maintaining the spacing between the plates. That is, -+
In order to obtain perfect spacing accuracy, the tolerance of the outer diameter of each plate and especially the centering of the plate must be extremely strict, but it is impossible to maintain such a tolerance due to the return force of tooth bending. or is possible only at considerable expense. West German Patent No. 3726641 C1
According to the specification, it is known to provide one of the plates X, 11 with a cam-shaped deformed portion. These deformations are aligned in one direction of rotation and thus result in a corresponding increase in the spacing of the associated plates.

However, such measures are originally intended to give the liquid friction clutch a difference in torque characteristics in both rotational directions, and cannot maintain a predetermined distance between the plates.

[Problems to be Solved by the Invention] The present invention provides a liquid friction clutch of the type mentioned at the beginning, which eliminates the conventionally used spacer ring and still allows for perfect spacing between the plates. The task is to do so.

[Means to solve the problem]

The present invention has solved these problems as follows. In other words, the internal grinding constant teeth of a large number of teeth on each plate that does not slide in the axial direction are bent out of the plane of the plate in an O-shape, and the bending angles at both locations are approximately 90°.
It is doing this.

According to such a measure, the plates for the liquid friction clutch can be assembled so as to be accurately maintained at predetermined intervals. Such a plate according to the invention is suitable for automatic assembly, in which case either the inner plate or the outer plate can be provided with bent teeth, depending on the function to be set. Since the bending angle of the O-shaped bend is approximately 906 degrees, the accuracy of the bending in the axial direction is determined solely by the accuracy of the tool used. Therefore,
Other tolerances such as outside diameter, inside diameter or material thickness of the plate do not affect the dimensional accuracy of the bend. A further advantage of the tooth bending according to the invention is that no bending moments act on the tooth which is folded in an O-shape. The axial forces acting on the spacing folds may only act as pushing forces in the axial web.

In an advantageous embodiment, which allows for particularly simple assembly, a certain number of teeth of the outer plate, which is connected in a relatively rotationally fixed manner to the clutch housing, are bent in an O-shape.

In the case of a liquid friction clutch configured as a so-called torque split device, two sets of inner plates are used, and a predetermined number of teeth of the inner plate, which is fixed to at least one clutch hub in a relatively non-rotatable manner, is arranged in an O-shape. It is folded into a shape [■11.

〔Example〕

FIG. 1 schematically shows the drive system of a four-wheel drive motor vehicle 15. As shown in FIG. This automobile 15 is front wheel drive. The two front wheels 16 are driven by the prime mover 8 via a main transmission 9 and a front differential 20 as well as a side shaft 21 . A drive system for the rear wheels 17 branches off from the front axle differential 20. For this reason, a center differential 22 is attached to the front differential 20. This center differential device 22 has one liquid Fi! as shown in FIG. A friction clutch is provided, which provides a differential limiting effect in relation to the rotational speed of the center differential 22. This center differential device 22 is connected to a rear axle differential device 24 via a propeller shaft 23, and the rear wheel 17 is driven by this rear axle differential device 24 via a side shaft 25.

The liquid 1g friction clutch shown in FIG. 2 mainly consists of a clutch hub 1 and a clutch casing 2 rotatably supported by a sealing member 3 on the clutch hub 1. The inner wall of the clutch casing 2 has internal teeth 4, whereas the clutch hub l has external teeth 5. A large number of inner plates 6 having corresponding teeth on the inner periphery are fitted into the outer teeth 5 so as to be non-rotatable and movable in the axial direction. A number of outer plates 7, which have corresponding teeth 9 on their outer periphery, are held in a non-rotatable manner on the clutch housing 2 via internal teeth 4.

A large number of inner plates 6 and outer plates 7 are arranged alternately in a fixed order in the internal chamber 11 of the clutch casing 2, and in this case, some of the teeth 9 of the outer plate 7 are arranged at a distance from the adjacent outer plate. The teeth 8 are bent in an Otsu-shape to maintain the A gap 12 is formed between the inner plate 6 and the outer plate 7, and the inner plate 6 slides in the axial direction within this gap 12. On the contrary,
Each outer plate 7 is maintained at a constant interval by teeth 8 folded into an O-shape. The tooth 8 bent in an O-shape is in contact with the unbent tooth 9 of the adjacent outer plate 7.

As shown in FIG. 3, the tooth 8 bent in an O-shape is bent only at a right angle 14 out of the plane of the outer brakes 1 and 7. The axial web 13 having a length related to the desired spacing b is further bent in a direction parallel to the plane of the outer brakes 1, 7 by only the right angle part 14a. The axial webs 13 are thereby at right angles to the plane of the outer plate 7 and are not subjected to bending moments when spaced apart from the adjacent outer plate.

In the case of the embodiment of the outer plate 7 shown in FIG. 4, five teeth 8 are provided which are bent in an O-shape. The number of such teeth 8 is arbitrary in relation to the pitch of the external teeth, but for the desired effect it is necessary to provide at least three. The outer plate 7 has many slits 10 on the inner circumferential side. When assembling the outer plate 7, the bent teeth 8 must come into contact with the unbent teeth of the adjacent outer plate. Such positioning can be effected, for example, by applying indexing marks along the plate and by providing corresponding measures in the automatic feeding device.

As shown in FIG. 5, the folded teeth 8 allow for spacing by axial webs 13;
This spacing can be maintained with sufficient accuracy.

A liquid friction clutch with spaced outer plates 7 in this manner can be incorporated, for example, in a center differential 22 of a motor vehicle as shown in FIG. In the illustrated embodiment, the clutch hub 1 is the drive part;
The clutch casing 2 is a driven part, and this driven part is connected to a rear axle differential 24 via a propeller shaft 23.
connected to. The internal chamber of the clutch casing 2 is at least partially filled with a viscous medium, in particular silicone oil.

FIG. 6 shows an example in which the inner plate 6 has teeth 8a bent in an O-shape.

FIG. 7 schematically shows a motor vehicle drive system in which a so-called torque splint device 28 is used instead of the center differential device 22 described above.

This torque split device 28 is connected to the center differential device 22.
At the same time, it replaces the usual rear axle differential 24. This torque splint device 28 includes a casing 26 driven by a bevel gear mechanism 27, in which two sets of outer plates are assembled in a relatively unrotatable manner, and two sets of inner plates belonging to each rear wheel drive section. It consists of 1. The present invention can be particularly advantageously applied to such uses. This is because in such cases a large number of plates are used and automatic assembly of the plates is effective.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of a drive system of a four-wheel drive vehicle incorporating a liquid friction clutch, Fig. 2 is a partial longitudinal cross-sectional view of the liquid friction clutch of the present invention, and Fig. 3 is an outer plate bent into an O-shape. FIG. 4 is a plan view of the outer plate, FIG. 5 is a side view of the outer plate, FIG. 6 is a plan view of the inner plate with teeth bent in an O-shape, and FIG. 1 is a schematic diagram showing a drive system of a four-wheel drive vehicle equipped with a torque split device. ■...Clutch hub, 2...Clutch casing, 3...Seal member, 4...Internal teeth, 5...
・External teeth, 6... Inner plate, 7.
... Outer plate, 8... Teeth bent in O-shape, 9... Teeth of outer plate, IO... Slit, 11... Internal chamber, 12... Gap, 13...
- Axial web, 14... Right angle part, 15... Automobile, 17... Rear transport, 19... Main transmission, 21... Night shaft, 22... Center differential, 23... Propeller shaft, 25... Side shaft, 27... Bevel gear mechanism, 28... Torx Friso 1-device. 24... Rear axle differential device, 26... Casing, 16... Front wheel, 18... Prime mover, 20... Front axle differential device, Fig. 2, Fig. 3, Fig. 4 only.

Claims (1)

[Scope of Claims] 1. A liquid friction clutch comprising: at least one clutch hub; and 1 rotatably supported on the clutch hub.
The plates of a plurality of plate sets are connected to the clutch hub and the clutch casing in a fixed order and alternately through teeth, respectively, in a relatively unrotatable manner, and each plate of one plate set is connected to In the case of a type in which a predetermined axial spacing is maintained and each plate of the other plate set is axially movable, the number of teeth of each plate (7) that is not axially movable is A predetermined number of teeth (8) inside are bent out of the plane of the plate in an O-shape, and both bent corners (14,
A liquid friction clutch, characterized in that 14a) is approximately 90°. 2. A predetermined number of teeth ( 8
) is bent in an O-shape. 3. According to claim 1, a predetermined number of teeth (8a) among the teeth of the inner plate (6) which is coupled with at least one clutch hub (1) in a relatively non-rotatable manner are bent in an O-shape. Liquid friction clutch as described.