JP3322015B2 - Housing vibration control structure of friction engagement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a centrifugal shoe clutch device of a multi-plate type and a centrifugal shoe type clutch device in a motorcycle, or a friction engagement device such as a friction clutch device and a drum type brake device. The present invention relates to a housing vibration damping structure.

[0002]

2. Description of the Related Art Some scooters and other motorcycles are equipped with a transmission for automatically performing a shift control, thereby relieving troublesome shift operations. FIG. 14 shows an outline of a power transmission path in such a motorcycle. Engine 1
The reciprocating motion of the zero piston 12 is converted into a rotational motion of the crankshaft 14. The rotational movement of the crankshaft 14 is transmitted to the rear wheels by a V-belt type automatic transmission. That is, in this V-belt type automatic transmission, the rotational motion is transmitted from the drive face of the driving pulley 16 to the driven face of the driven pulley 20 via the V-belt 18, and the centrifugal shoe type clutch device is used. Through the rear wheel. FIG. 15 shows a detailed configuration example of the clutch assembly shoe 22 and the clutch housing 26 of the centrifugal shoe type clutch device as viewed in the axial direction. In this centrifugal shoe clutch device, a clutch assembly shoe (a combination of a clutch assembly 23 and a clutch shoe 24) 22, which is fixed to the driven pulley 20 in the axial rotation direction, rotates. When the rotational movement of the assembly shoe 22 increases, the clutch shoe 24 itself becomes a weight and expands due to centrifugal force, and the lining 24a on the outer peripheral surface of the clutch shoe 24
Contacts the inner peripheral surface 26a of the clutch housing 26,
It will be connected immediately after that. Thus, the rotational force of the clutch ash shoe 22 is transmitted to the clutch housing 26, and the rotational movement of the clutch housing 26 is transmitted to the drive shaft 28, and finally transmitted through the reduction gear mechanism 30. Is transmitted to the rear axle shaft 32 to rotate the rear wheel (not shown).

As shown in detail in FIG. 16, the clutch housing 26 has a substantially bowl shape which is entirely axially symmetrical, and has a bottom portion 26a extending substantially in a disk shape outward from the shaft. The outer peripheral portion of the bottom portion 26a has a side edge portion 26b formed in a cylindrical shape along the axis continuously. Also,
The clutch shoe 24 is provided with the clutch housing 26.
And engages with and disengages from the clutch housing 26 by contacting and separating from the inner peripheral surface of the side edge portion 26b. The engagement / disengagement of the clutch shoe 24 to / from the clutch housing 26 transmits / blocks the engine rotation output input to the clutch shoe 24 to the clutch housing 26 side. In FIG. 16, reference numeral 33 denotes a fitting cylinder for fixing the drive shaft 28 to the housing in the rotation direction.

[0004]

In FIG. 15 described above,
Although the clutch shoe 24 is shown in a stopped state, when the clutch assembly 23 rotates, the clutch shoe 24 itself becomes a weight and expands due to centrifugal force. When the clutch assembly shoe 22 rotates and the clutch shoe 24 expands and contacts the inner circumferential surface of the clutch housing 26, the clutch
The shoe 24 may intermittently contact the inner peripheral surface of the clutch housing 26. That is, the vibration of the transmission torque generates an unusual sound called "squealing of the clutch housing", and the driver riding the motorcycle feels uncomfortable sound.

[0005] Normally, the clutch housing 26 is shown in FIG.
Has a substantially bowl-shaped structure by itself. The generation of abnormal noise from the clutch housing 26 may be caused by the shape and surface roughness of the inner peripheral surface of the clutch housing 26 or the shape and surface roughness of the lining 24a fixed to the outer surface of the clutch shoe 24, or the material of the lining 24a. Is a major factor.

Here, an abnormal noise generated from the clutch housing 26 will be considered by taking a triangle 34 used in music as an example as shown in FIG. When the triangle 34 is hit with the hitting bar 36, the triangle 34 vibrates, and a vibration sound is emitted as "chain" and resonates around. When the striking bar 36 is brought into contact with the vibrating triangle 34, the vibration sound of the triangle 34 disappears, and no sound is emitted.

FIG. 18 shows an example of a system for suppressing "squealing of the clutch housing" generated between the clutch shoe 24 and the inner peripheral surface of the clutch housing 26 due to various factors. The principle is the same as the principle shown in FIG. In order to press-fit the outer peripheral side of the clutch housing 26, a plate material 38 having a bowl shape and a structure portion in which the center of the bottom of the bowl shape is deleted (here, this plate material is referred to as a vibration damping plate) is manufactured. I do. The vibration damping plate 38 is pressed into the outer peripheral side of the clutch housing 26, and the bottom 3 a of the vibration damping plate 38 is formed at the bottom 26 a of the clutch housing 26.
8a is fixed by welding, for example. When the inner diameter of the damping plate 38 is substantially the same as the outer diameter of the clutch housing 26, that is, there is almost no press-in tolerance due to fitting (there is no or small press-in allowance).
That is, when it is approximated to zero, the edge 38b of the vibration damping plate 38, like the striking rod 36 for stopping the vibration sound, against the bowl-shaped outer peripheral surface of the clutch housing 26 that vibrates like the triangle 34, Clutch housing 2
6 will touch the edge 26b. Here, the damping plate 3
Consider the mounting method of No. 8 to the clutch housing.

When only the bottom 26a of the clutch housing 26 and the bottom 38a of the damping plate 38 are fixed, the edge 38b of the damping plate 38 can exhibit a function like the hitting bar 36. However, when the press-fitting allowance is large, both the clutch housing 26 and the damping plate 38 are fixed at the bowl-shaped edges 26b and 38b, and the clutch housing 26 and the damping plate 38 An integrated structure is obtained in which both ends of the bowl-shaped edges 26b and 38b and the bowl-shaped edges 26b and 38b are fixed. In this integrated structure, the damping plate 38 cannot exert a function of suppressing abnormal noise generated between the clutch shoe 24 and the inner peripheral surface of the clutch housing 26.

The respective states of the bowl-shaped edge 26b of the clutch housing 26 and the bowl-shaped edge 38b of the vibration damping plate 38 pressed into the outer peripheral side thereof will be described. In order to eliminate abnormal noise generated between the clutch shoe 24 and the inner peripheral surface of the clutch housing 26, it is necessary that the clutch housing 26 and the vibration damping plate 38 function as separate bodies. That is, the press-fitting margin is preferably a value close to zero. The press-fitting margin close to zero is a state in which the clutch housing 26 and the damping plate 38 are in contact with each other, in other words, a state in which they are sometimes in contact with each other and are sometimes separated from each other.

Here, the manufacturing process of both the clutch housing 26 and the damping plate 38 will be considered. The clutch housing 26 is generally manufactured by machining according to the required tolerances and dimensions of its inner diameter and outer diameter.
On the other hand, the damping plate 38 is generally manufactured by pressing a steel plate, and it may be considered that the post-processing for controlling the inner diameter and the outer diameter is hardly performed. . In this case, the damping plate 38 to be pressed is applied to the machined outer diameter of the clutch housing 26.
It is extremely strict to control the inner diameter of the dies to a tolerance comparable to that of machining. Therefore, the tolerance of the inner diameter of the damping plate 38 must be gradual with respect to the dimensional tolerance of the clutch housing 26.

For this reason, the press-in allowance sometimes becomes large (= tight pressure) and sometimes small (= approximately zero). The large press-fitting allowance means that the bottom 26a of the clutch housing 26 and the bottom 38a of the damping plate 38
And the bowl-shaped edges 26b and 3 of each other
8b is fixed, and the clutch housing 26
And the vibration damping plate 38 have an integrated structure, and the noise generated between the clutch shoe 24 and the inner peripheral surface of the clutch housing 26 cannot be completely eliminated. On the other hand, if the press-in allowance is small, especially if the bowl-shaped edges of both do not contact at all,
The bowl-shaped edge 38b of the damping plate 38 does not touch the edge 26b of the clutch housing 26, so that any noise generated between the clutch shoe 24 and the clutch housing 26 disappears. It does not contribute.

There is a possibility that abnormal noise may occur when the housing member and the shoe member come into contact with or disengage from each other because, in addition to the centrifugal shoe type clutch device, a frictional engagement device such as a brake device or another type of clutch device. What happens at

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and the opening of the leading edge of the damping plate which is press-fitted into the housing member of the engagement device is gradually opened to substantially release the margin. It is an object of the present invention to provide a housing vibration damping structure of a friction engagement device that can approximate zero and thereby reliably eliminate abnormal noise generated between a shoe member and an inner peripheral surface of a housing member. .

[0014]

In order to solve the above-mentioned problems, the invention according to claim 1 has a bottom portion which is generally bowl-shaped and extends outward from a central axis and an outer peripheral portion of the bottom portion. A housing member having a cylindrical side edge formed continuously along the central axis, and a shoe member engaged with and disengaged from the housing member by contacting and separating from the inner peripheral surface of the side edge portion of the housing member. Externally fitted to the housing member
In a housing vibration damping structure for a frictional engagement device comprising a circular annular vibration damping member, the vibration damping member includes a housing member.
A bottom portion that contacts the bottom portion of the housing member,
The outer peripheral surface of the edge is flat at the tip in the direction away from the bottom.
A recess that follows the surface and the flat surface, the housing portion
Corresponding to the flat surface of the material tip
Press-fit externally , and apply the leading edge from the flat surface to the concave
Gently release the press-fitting allowance, and
The housing has a configuration of a vibration damping structure for a housing of a friction engagement device, wherein cutouts are formed along the directions .

[0015]

In the housing vibration damping structure, for example,
8, the clutch housing 26 and the damping plate 38
In the method of combination with the above, the fixed portion of the vibration damping plate 38 to the clutch housing 26 is formed by each of the bowl-shaped bottom portions 26a.
And 38a, and the portions that exhibit the vibration damping function are the bowl-shaped edges 26b and 38b. The inner diameter of the damping plate 38 has some width with respect to the outer diameter of the clutch housing 26.

The inventor of the present invention, when press-fitting the damping member into the outer surface of the clutch housing, regardless of the width of the inner diameter of the damping member with respect to the outer dimension of the housing member, has the leading edge of the damping member. As a result of various investigations in order to make the press-in allowance of the part close to zero, a notch such as a slit is formed at the end edge of the damping plate.

According to the first aspect of the present invention, a notch is formed in the front end side edge of the vibration damping member, and the vibration damping member is fitted to at least the outer peripheral surface of the housing member side edge with a press fit allowance. Further, since the portion other than the front edge is fixed to the housing member, the front edge is elastically deformed by the notch and opens in the circumferential direction even if there is a press-fit allowance of the vibration damping member. In the part, the press-in allowance is gradually released, and approaches zero.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. Note that the same numbers are given to the same portions as in FIGS. 14 to 18 and the description is omitted. FIG. 1 is a sectional explanatory view of a vibration damping structure of a clutch device for a motorcycle according to an embodiment of the present invention, FIG. 2 is a partial detailed view of FIG. 1, and FIGS.
(E) is an explanatory view of each example of a slit (corresponding to a notch) formed in the damping plate of the damping structure, and (a) and (b) of FIG. 4 are each examples of the number and positions of the slits formed; Illustration of FIG. 5, FIG.
FIG. 6 is an explanatory perspective view of a vibration damping plate having a slit, FIG. 6 is an explanatory diagram of a vibration damping structure in which the vibration damping plate is externally fitted to a clutch housing, FIGS. 7 to 11 are explanatory diagrams of effects of the present invention, and FIG. FIG. 13 is an explanatory view of another embodiment of the present invention.

This embodiment is a vibration damping structure provided in a centrifugal shoe clutch device mounted on a power unit for a motorcycle similar to that shown in FIG. Clutch device as in Figure 1, the side edges 48b of the clutch housing 48, recess 49 over the bottom portion 48a is formed from a length L ₀ away from the tip 48c. Otherwise, the clutch housing is the same as the clutch housing of FIG.

In the above-mentioned vibration damping structure, a substantially bowl-shaped damping plate 50 having a bottom portion 50a and a side edge portion 50b has a press fit so as to cover the outer peripheral surface of the bowl-shaped housing 48. It is fitted outside. This damping plate 50 has a bottom 5
A circular through hole 50a1 is formed at the center of Oa.
Further, in the external fitting, the vibration damping plate 50 is connected to the side edge portion 4.
The tip of 8b in contact with the portion of the length L _0, not in contact in the portion formed of the recess 49. The damping plate 50 includes:
One or more slits 52 are formed in the front edge 50b in the direction in which the side edge 48b is away from the bottom 48a, and the bottom 50a (corresponding to a portion other than the front edge) is welded to the housing 48. It is fixed.

First, the slit (notch) 52 of the present invention is used.
Shape and dimensions will be described. Clutch housing 48
To make the press-fitting allowance of the vibration damping plate 50 approximately zero,
The length L along the axial direction of the slit 52 is the same as the length (the length L ₀ ) of an edge portion (referred to as a contact edge portion) where the clutch housing 48 and the vibration damping plate 50 are in contact with each other, or before and after. the length of (L ≒ L _0), or may be you have the length of the contact edge portions L ₀ or more lengths (L ≧ L _0). The length L of the slit 52 is thus equal to the length L _{0 of the} contact edge portion.
The width W of the slit 52 is not particularly limited in the present invention as long as it has the same value, the value before and after, or is equal to or longer than the contact edge length L ₀ . Also, the slit 52
As shown in FIG. 3, for example, (a): semi-trochoidal shape (U-shape), (b): semi-circular shape,
There are (c): a semi-elliptical shape, (d): a square shape, and (e): a triangular shape (V shape). In the present invention, the shape is not particularly limited.

Next, the number or positions of the slits 52 to be formed in the front edge portion 50b of the damping plate 50 will be described. FIG. 4 schematically illustrates the number and positions of the slits 52. In this figure, (a): the left column is 1
One or two or more slits 52 are formed on the tip edge 50b of the damping plate 50, and two or more slits 5
In the processing of No. 2, the tip end portion 50b of the damping plate 50 is formed at a position where the circumferential direction is equally distributed. And in this figure, (b): the right column has two or more slits,
This is a case where the tip end edge portion 50b of the damping plate 50 is machined to a position where the circumferential direction is unevenly distributed. For example, in FIG.
2 shows a perspective configuration of a vibration damping plate 50 in which two are formed.

A slit 5 is formed in the leading edge 50b of the damping plate 50.
When 2 is machined, the press-fitting allowance due to the outer diameter of the clutch housing 48 and the inner diameter of the damping plate 50 is loosely released, and approaches zero. And
In the entire outer periphery of the damping plate 50, the clutch housing 4
The contact with 8 is evenly close to zero at any point. In order to make the processing of the slit 52 relatively simple and to make the processing unit relatively inexpensive, it is preferable that the number of slits processed is about two. However,
Regarding the number of processing and the processing position of the slit 52, there are various application methods as shown in FIG.
It does not specify the number of cuts or the processing position.

In the embodiment, the leading edge 50b of the damping plate 50
As shown in FIG. 5, two slits 52 were formed at equal intervals of 180 ° with respect to the circumferential direction of the leading edge of the damping plate 50. The shape of the slit 52 is a half trochoidal shape, and the short axis dimension (width W) is 3 (mm) and the long axis dimension (length L) is (L ₀ +
1) = 7 (mm) As shown in FIG. 6, the vibration damping plate 50 in which the slit 52 has been processed was pressed into the clutch housing 48. The clutch housing assembly in which the vibration damping plate 50 having been subjected to the slit 52 working according to the present invention as described above was press-fitted into the clutch housing 48 was used as a sample 1 for measurement described below.

The following samples 2 to 4 were prepared as clutch housing assemblies for comparison. Specimen 2: In the market {squeal of clutch housing}
Occurs, the clutch housing assembly recovered from the user. The clutch housing used for the clutch housing assembly is the same as that shown in FIG.
As shown in FIG.
No damping plate is used. Sample 3: As shown in FIG. 18, a conventional damping plate 38 is press-fitted to the outer peripheral side of the clutch housing 26, but the slit is not formed in the damping plate 38. . At the same time, the clutch housing 26
The press-fit tolerance between the damping plate and the damping plate 38 is set to a relatively tight state. Sample 4: clutch housing 26 as shown in FIG.
Is a type in which a damping plate 38 is press-fitted on the outer peripheral side, but no slit is formed in the damping plate 38. At the same time, the press-fit tolerance between the clutch housing 26 and the vibration damping plate 38 is set to a state where it approaches approximately zero.

The transfer functions of the four samples 1 to 4 were measured. 7, 8, 9, and 10
Is a graph showing waveforms of transfer functions of Samples 1, 2, 3, and 4, respectively. In the graphs of these figures, the horizontal axis represents frequency (kHz), and the vertical axis represents the decibel value (dB) of the vibration level (= sound pressure level). FIG. 11 shows the relationship between a certain amount of vibration level: ΔdB and the frequency level to be attenuated: Δf.

[0027] shown in FIG. 8, in the market, if the clutch housing Assi which generated the "squeal of the clutch housing", the vibration level waveform representing a high natural frequency f ₀ indicates a sharp waveform, also, It can be seen that the frequency range to be attenuated: Δf is smaller than a certain amount of vibration level: ΔdB. In the case of FIG. 9, the vibration level slightly decreases, the waveform indicating the natural frequency f ₀ becomes slightly obtuse, the frequency range: Δf also slightly increases, and it can be seen that the vibration damping property is improved. In the case of FIG. 10, the damping plate exerts its damping effect without any effect, the vibration level is very low, the waveform indicating the natural frequency f ₀ is obtuse, and the frequency range: Δf is the most. The big is obvious.

On the other hand, when observing FIG. 7 showing the waveform of the transfer function of the clutch housing assembly into which the slit-processed damping plate according to the present invention is press-fitted, a waveform relatively close to FIG. 10 can be obtained. did it. That is, in the case of the clutch housing 48 into which the slit 52 processed vibration damping plate 50 according to the present invention is press-fitted, the vibration level is low and the waveform indicating the natural frequency f ₀ is obtuse, and the frequency range: Δf is large. Therefore, the press-fitting tolerance between the clutch housing 48 and the damping plate 50 is approximately zero, and it is determined that the damping performance is effectively exhibited.

If the recess 49 is formed on the outer peripheral surface of the side edge portion 48b of the clutch housing 48 as in the above-described embodiment, the press-fitting tolerance of the damping plate approaches almost zero at the front end edge portion, and the outer peripheral surface of the housing is reduced. Is gradually released to approach zero, and the side edges other than the front edge corresponding to the recess 49 do not touch the outer peripheral surface of the housing. However, if the depth of the recess is properly selected, the press-fit allowance is gradually released from the relationship with the press-in tolerance of the damping plate and approximates to zero, and the portion corresponding to this recess also exerts the vibration-damping effect. be able to.

The present invention is, of course, not limited to the configuration of the above embodiment. 12 and 13
FIG. 14 shows another embodiment of the present invention. In this other embodiment, for example, as shown in FIG. 12, the damping plate 54 is formed in an annular band shape without a bottom corresponding to only the side edge portion 48b of the clutch housing 48, and the clutch housing side edge portion 4 is formed.
The slit 52 is also formed in the rear edge 54a as well as in the front edge 54b corresponding to the front end 8b. In this case, the slit 52 is formed at a position where both sides in the width direction are different from each other. FIG. 13 is a cross-sectional view showing a state in which the vibration damping plate 54 is fitted.

Further, the present invention is not limited to the one applied to the housing of the clutch device, and the shoe member comes into contact with the inner peripheral surface of the housing member such as another brake device or other clutch device and the like. Can be applied as a vibration damping structure to various types of frictional engagement devices that engage with.

[0032]

As described above, according to the present invention, the press-fitting margin is gradually released to almost zero by the notch at the leading edge of the damping plate which is press-fitted into the housing member of the friction engagement device. Therefore, the noise generated between the shoe member and the inner peripheral surface of the housing member can be reliably eliminated.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a cross section of a clutch housing of a clutch device according to an embodiment of the present invention.

FIG. 2 is a partial detailed view of FIG.

FIGS. 3A to 3E are explanatory views of examples of slits formed on a damping plate having a damping structure.

FIGS. 4A and 4B are explanatory diagrams of examples of the number and positions of slits shown in FIG. 3;

FIG. 5 is an explanatory perspective view of a vibration damping plate on which a slit is processed.

FIG. 6 is an explanatory view of a vibration damping structure in which a damping plate is externally fitted to a clutch housing.

FIG. 7 is an explanatory diagram of an operation of the vibration damping structure according to the embodiment.

FIG. 8 is an explanatory diagram of an operation of the vibration damping structure according to the embodiment.

FIG. 9 is an operation explanatory view of the vibration damping structure of the embodiment.

FIG. 10 is an explanatory diagram of an operation of the vibration damping structure according to the embodiment.

FIG. 11 is an operation explanatory view of the vibration damping structure of the embodiment.

FIG. 12 is an explanatory diagram of another embodiment of the present invention.

FIG. 13 is an explanatory diagram of another embodiment of the present invention.

FIG. 14 is an explanatory diagram of an engine equipped with a general centrifugal shoe clutch device.

FIG. 15 is an explanatory view of a general centrifugal shoe type clutch device.

FIG. 16 is an explanatory sectional view of the clutch housing in FIG. 15;

FIG. 17 is an explanatory diagram of a triangle vibration sound for explaining the vibration of the clutch housing.

FIG. 18 is a cross-sectional view of a clutch housing in which a conventional vibration damping plate is fitted.

[Explanation of symbols]

 48 Clutch housing 48a Clutch housing bottom 48b Clutch housing side edge 50, 54 Damping plate 50a Damping plate bottom 50b Damping plate tip edge 52 Slit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho-63-193131 (JP, U) Japanese Utility Model Sho-63-193130 (JP, U) Japanese Utility Model Sho-63-193129 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) F16D 11/00-23/14 F16D 41/00-47/06 F16D 49/00-71/04 F16F 15/10

Claims (1)

(57) [Claims] 1. A bottom part which is generally bowl-shaped and extends outward from a central axis, and a side edge part formed in a cylindrical shape along the central axis continuously to an outer peripheral part of the bottom part. A friction member comprising: a housing member having: a shoe member that contacts and separates from an inner peripheral surface of a side edge portion of the housing member to engage and disengage with the housing member; and an annular vibration damping member externally fitted to the housing member. In a housing vibration damping structure of an engagement device , a bottom contacting the vibration damping member with a bottom portion of the housing member.
Parts are provided on an outer peripheral surface of a side edge portion of the housing member, and are separated from the bottom portion.
A flat surface at the end in the direction of
And the vibration damping corresponding to the flat surface of the tip of the housing member.
The leading edge of the member is externally press-fitted, and the leading edge is recessed from the flat surface to the recess to loosen the press-in allowance.
Gently open and cut the tip edge along the axial direction
A housing vibration damping structure for a friction engagement device, wherein a notch is formed .