JPH0430425Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a clutch disk of a friction clutch suitable for an automobile clutch, and particularly relates to vibrations in the relative rotational direction (hereinafter referred to as torsional vibration) between the clutch hub and the disk plate. The present invention relates to a clutch disc having damping means for damping vibrations.

(Prior Art) As a conventional clutch disk, for example, a friction clutch disk for automobiles described in Japanese Patent Application Laid-Open No. 56-167526 is known. This clutch disc has a clutch plate and a sub-disk plate arranged on both sides of the flange of a clutch hub fitted to a rotating shaft, a damper device is arranged between these two plates, and a connecting pin connects both plates. In a friction clutch disk for an automobile that connects and transmits driving force to a clutch hub via a damper device, damper sheets are fixed to both ends of a cylindrical body made of an elastic body to form a hollow chamber,
A partition member for dividing the hollow chamber is provided at approximately the middle position of the cylinder body, this partition member is fixed to the flange portion, an orifice for communicating the divided hollow chambers with each other is provided in the partition member, and the hollow chamber is A damper device is constructed by sealing a fluid.

(Problems to be solved by this invention) However, in such a conventional clutch disk, the hollow chamber is divided by a partition member, and the divided hollow chambers are separated by an orifice provided in the partition member. Because of the communication, the length of the orifice is restricted, making it impossible to freely set the vibration characteristics of the fluid passing through the orifice, resulting in a problem in that a sufficient damping effect may not be obtained. In other words, in order to obtain a larger damping effect, it is desirable to set the resonant frequency of the fluid passing through the orifice within the damping target frequency range so that the fluid can exert a dynamic damper effect. The resonant frequency of the fluid in the orifice must match the torsional resonant frequency of the drive system, which is usually 10 [Hz] or less, but as mentioned above, this conventional clutch disk is limited by the length of the orifice. It was not possible to match the resonant frequency of the fluid in the orifice with the torsional resonant frequency of the drive system, and it was not possible to obtain a sufficient damping effect.

(Means for solving the problem) This invention was made with the aim of solving the above-mentioned conventional problems, and it is a disc plate equipped with a friction material on a clutch hub fitted to a rotating shaft. In a clutch disk coupled to allow relative displacement in the rotational direction, a plurality of protruding members are spaced apart in the rotational direction of the clutch hub and protrude in the radial direction, and between each pair of protruding members adjacent in the rotational direction of the clutch hub. a pair of cylindrical members arranged at one end and each closed at one end by a first partition plate that engages with the protruding member, and whose other end is respectively closed by a second partition plate that engages with the disk plate; a flow path whose both ends open to the second partition plate, and the relative rotational displacement between the clutch hub and the disk plate is provided between the protruding members adjacent in the rotational direction by the first and second partition plates and the cylindrical member. A pair of fluid chambers whose volumes change inversely with each other are defined, and both fluid chambers are communicated with each other by a flow path.

(Function) In the clutch disk according to this invention, the first partition plate and the second partition plate are relatively displaced in the rotational direction as the clutch hub and the disk plate are rotated relative to each other. When a pair of communicating fluid chambers change their volumes inversely to each other, the flow path acts as a restrictor. Further, this flow path can be made to have an arbitrary length by appropriately setting the interval between the protruding members, the length of the cylindrical member, and the like. Therefore, by making the length of the flow path relatively large, the resonance frequency of the fluid flowing back and forth (vibration) in the flow path can be set to a low frequency range, and the resonance frequency of the fluid flowing between the pair of fluid chambers can be set to a low frequency range. It becomes possible to function as a dynamic damper, and it is possible to further reduce torsional vibration between the clutch hub and the disc plate.

(Example) Hereinafter, an example of this invention will be described based on the drawings.

1 and 2 show an embodiment of the clutch disk according to the present invention, with FIG. 1 being a plan view and FIG. 2 being a sectional view taken along the line--O in FIG. 1.

First, to explain the structure, reference numeral 11 is a clutch hub spline-coupled to a rotating shaft (not shown), and this clutch hub 11 has four projecting parts (two shown in the drawing) 12 that project in the radial direction. integrally formed at π/2 [rad] intervals,
Additionally, four recesses (two shown) 13 are formed between the protrusions 12 and are recessed in the rotation center direction O. These four protrusions 12 are a plurality of protruding members that are spaced apart in the rotational direction of the clutch hub 11 and protrude in the radial direction. A dynamic damper, which will be described later, is engaged with each protrusion 12 at its radial tip, and a substantially cylindrical elastic body 14 made of a rubber-like elastic material is compressed in the axial direction in each recess 13. In this state, it is inserted and fixed through the end plate.

On the outer periphery of the clutch hub 11, substantially disk-shaped drive plates (disc plates) 15 and side plates 16 are attached to both sides of each of the protrusions 12 in the axial direction so as to be rotatable relative to the clutch hub 11. These drive plates 15 and side plates 16 are
Four pins 17 arranged at equal intervals in the rotation direction R
A window hole 18 corresponding to each elastic body 14 and a window hole 19 corresponding to a dynamic damper described later are formed so as to extend in the direction of rotation. The pin 17 is loosely inserted into a substantially oval-shaped hole 20 formed to extend in the rotational direction of the clutch hub 11, and comes into contact with the end of the hole 20 in the rotational direction, thereby increasing the maximum rotation between the drive plate 15 and the clutch hub 11. Regulate dynamic displacement.
In addition, the drive plate 15 and the side plate 1
6 and each window hole 18 of these plates 15, 16
As the clutch hub 11 and the clutch hub 11 are rotated relative to each other, one end of the clutch hub 11 comes into contact with the end plate of the elastic body 14, thereby further compressing the elastic body 14. That is, the drive plate 15 and the side plate 16 are elastically coupled in the rotational direction by an elastic body 14 attached to the clutch hub 11. The drive plate 15 has facings (friction material) 21 fixed to its front and back surfaces by rivets 22, and a cushion spring 23 fixed to its outer peripheral edge.

24 is the clutch hub 11 and drive plate 1
5 shows a dynamic damper as a whole that damps vibrations in the rotational direction (hereinafter referred to as torsional vibrations),
The dampers 24 are located between each pair of adjacent protrusions 12, 12 in the rotational direction of the clutch hub 11, and a total of four dampers 24 are provided. As shown in detail in Figure 1, these dampers 2
Reference numeral 4 denotes a pair of first partition plates 26, 26 that respectively engage the protrusions 12 between each pair of protrusions 12, 12 adjacent in the rotational direction.
(hereinafter also referred to as one partition plate 26), and a pair of second partition plates 2 that engage with the drive plate 15.
7, 27 (hereinafter also referred to as the other partition plate 27)
The first partition plate 26 closes one end near the protrusion 12, and the second partition plate 27
a pair of cylindrical members 2 whose other ends are closed by
5, 25, and a tube member 30 whose both ends open into a pair of partition plates 27, 27, and each of the pair of first partition plates 26, second partition plates 27, and cylinder member 25 makes it possible to A flow path 30 within a certain pipe member 30
A pair of fluid chambers 28 and 29 are defined which communicate with each other via a. The cylindrical member 25 is located in each window hole 19 of the drive plate 15 and the side plate 16 so as to be elastically deformable, and one of the partition plates 26 is
engages with the protrusion 12 of the clutch hub 11, and
The other partition plate 27 is positioned so as to be able to lock onto one end of each window hole 19 in the rotational direction by rotational displacement between the clutch hub 11 and the drive plate 15 .
Since the fluid chambers 28 and 29 have the same configuration, the cylindrical member 25 and the partition plates 26 and 27 are given the same reference numerals in the drawings, and only one dynamic damper 24 will be described. Other components of the dynamic damper are distinguished by dash symbols. These fluid chambers 28,
29 form a pair, are filled with an incompressible fluid such as oil or water, and cause opposite volume changes as the clutch hub 11 and drive plate 15 are rotated relative to each other. That is, these fluid chambers 28, 29
For example, when a relative rotational displacement occurs between the clutch hub 11 and the drive plate 15 such that the clutch hub 11 is displaced in the direction of the arrow in FIG. 1, one of the partition plates 26 is displaced together with the clutch hub 11. At the same time, the other partition plate 27 is displaced from the drive plate 15, and the cylindrical member 25 is deformed.
By causing the fluid inside the fluid chambers 28 and 29 to flow through the flow path 30a of the pipe member 30, the volumes change inversely to each other. Note that these dynamic dampers 24 are designed such that the inner diameter and overall length of the flow path 30a of the tube member 30 are adjusted such that the resonance frequency of the fluid vibration of the fluid that reciprocates (vibrates) in the tube member 30 is approximately 10 [Hz] or less.
The spring constant etc. of the cylindrical member 25 are set to appropriate values.

Next, the effect will be explained.

Now clutch hub 11 and drive plate 15
Assuming that torsional vibration with a frequency of 10 [Hz] or less has occurred between each dynamic damper 24
As described above, since the volumes of the fluid chambers 28 and 29 change inversely to each other, the fluid flows back and forth in the fluid chambers 28 and 29 via the flow path 30a of the pipe member 30. At this time, since the resonance frequency of the fluid vibration of the damper 24 is set to 10 [Hz] or less, the fluid flowing between the fluid chambers 28 and 29 causes the fluid in the flow path 30a of the pipe member 30 to M, a resonance phenomenon occurs in which the bulk elasticity of each fluid chamber 28, 29 is used as a spring K. As a result, torsional vibrations between the clutch hub 11 and the drive plate 15 having a frequency of 10 Hz or less are canceled out by each damper 24 and sufficiently reduced.

Furthermore, in this clutch disk, each damper 24 functions to attenuate the vibration with the flow in the fluid flow path 30a against torsional vibration in a frequency range exceeding 10 [Hz]. It goes without saying that it is possible to obtain the same damping effect as (Japanese Unexamined Patent Publication No. 156526/1983).

3 and 4 show other embodiments of the clutch disk according to this invention. Note that the same parts as in the embodiment described above are given the same numbers and the description thereof will be omitted.

As shown in the figure, in the clutch disk of this embodiment, fluid chambers 28 and 29 of each dynamic damper 24 are communicated with each other by a spiral flow path 31. This flow path 31 has a spiral groove 3 on the outer periphery.
It is defined by fitting a substantially cylindrical member 32 having a diameter 2 a into a tube 33 .

In the clutch disk of this embodiment, the length of the flow path 31 of the dynamic damper 24 can be increased, so that the resonance frequency of fluid vibration can be easily set in a low frequency range. That is, as is well known, the resonance frequency of fluid vibration in the damper 24 is inversely proportional to the square root of the length of the flow path 31;
In this embodiment, it is easy to set the resonance frequency to a low frequency. Furthermore, the damper 24 in this clutch disk has a high degree of freedom in setting the resonant frequency because the channel 31 can be made to a desired length by changing the pitch of the spiral groove 32a of the member 32 without changing the overall dimensions. is large, and furthermore, the fluid flowing into the fluid chambers 28 and 29 from the flow path 31 generates a vortex flow, so that a larger damping force can be obtained.

Note that in each of the embodiments described above, the fluid chambers 28, 2
9 is defined by a cylindrical member 25 made of a rubber-like elastic material, but the members defining these fluid chambers 28 and 29 are not limited to those made of a rubber-like elastic material, and may be, for example, cylinders or the like. Needless to say, it can also be defined by a piston.

(Effects of the invention) As explained above, according to the clutch disk of this invention, a flow path communicates between a pair of fluid chambers whose volumes change inversely as a result of torsional vibration between the clutch hub and the drive plate. Since the dynamic damper is provided on the clutch hub, this dynamic damper can further reduce torsional vibration in the frequency range near the resonance frequency between the clutch hub and the drive plate.

Furthermore, in other embodiments of this invention, since the pair of fluid chambers of the dynamic damper are communicated by a spiral flow path, the degree of freedom in setting the resonant frequency of the dynamic damper is increased. , the frequency range of torsional vibration that can be reduced is expanded.

[Brief explanation of the drawing]

1 and 2 show an embodiment of a clutch disk according to this invention, with FIG. 1 being a partially sectional plan view and FIG. 2 being a sectional view taken along the line -O-. 3 and 4 show other embodiments of the clutch disk according to this invention, FIG. 3 being a partially sectional plan view, and FIG. 4 being a sectional view taken along the line -O--. 11...Clutch hub, 12...Protrusion part (protrusion member), 15...Drive plate (disc plate), 21...Facing (friction material), 24
...Dynamic damper, 25...Cylindrical member (cylindrical member), 26...First partition plate, 27...Second partition plate, 28, 29...Fluid chamber, 30...Pipe member,
30a, 31...flow path.

Claims (1)

[Scope of utility model registration request] In a clutch disk in which a disk plate provided with a friction material is coupled to a clutch hub fitted to a rotating shaft while allowing relative displacement in the rotational direction,
a plurality of protruding members that are spaced apart in the rotational direction of the clutch hub and protrude in the radial direction; and a first partition plate that is disposed between each pair of protruding members adjacent in the rotational direction of the clutch hub and that engages with the protruding members. a pair of cylindrical members each having one end closed by the disk plate and the other end closed by a second partition plate that engages with the disk plate; and a flow path having both ends open to the second partition plate. A pair of fluid chambers whose volumes change inversely with each other in accordance with relative rotational displacement between the clutch hub and the disk plate are defined between the protruding members adjacent in the rotational direction by the first and second partition plates and the cylindrical member. A clutch disk characterized in that both fluid chambers are communicated with each other by a flow path.