JP3322014B2 - 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 Motorcycles such as scooters are equipped with a centrifugal shoe clutch device that automatically performs complicated clutch engagement and disengagement operations according to the engine speed and an automatic transmission device that automatically performs gear shifting operations. Then, there is a type in which the driver's operation burden is reduced as much as possible.

FIG. 5 shows an outline of a power transmission path of a power unit in a motorcycle of this type. In the illustrated power unit, first, the reciprocating motion of the piston 12 of the engine 10 is converted into the rotational motion of the crankshaft 14. This rotational movement of the crankshaft 14
The power is transmitted to the rear wheels by a V-belt type automatic transmission. That is, in the V-belt type automatic transmission, the rotational motion is transmitted from the drive face of the drive pulley 16 to the V-face.
The power is transmitted to the driven face of the driven pulley 20 via the belt 18 and further transmitted to the rear wheel via the centrifugal clutch device. FIG. 6 shows a detailed axial longitudinal view of the clutch assembly shoe 22 and the clutch housing 26 of the centrifugal clutch device.

In this centrifugal clutch device, a clutch assembly shoe (a combination of a clutch assembly 23 and a clutch shoe 24) 22 fixed to a 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 torque of the clutch ash shoe 22 is transmitted to the clutch housing 26,
Further, the rotational movement of the clutch housing 26 is transmitted to the drive shaft 28 and the reduction gear mechanism 3
0 to the rear axle shaft 32, and the rear wheel (not shown) rotates.

As shown in detail in FIG. 7, the clutch housing 26 has a substantially bowl shape symmetrical with respect to the entire axis, and extends substantially in a disk shape outward from the shaft.
6a and a side edge 26b formed in a cylindrical shape along the axis continuously on the outer periphery of the bottom 26a. The clutch shoe 24 engages with and disengages from the clutch housing 26 by contacting and separating from the inner peripheral surface of the side edge 26b of the clutch housing 26. 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. 7, reference numeral 33 denotes a fitting cylinder for fixing the drive shaft 28 to the housing in the rotation direction.

In FIG. 6, the clutch shoe 24
Is shown as stopped, but clutch assembly 2
3 rotates, the clutch shoe 24 is rotated by centrifugal force.
The weight itself becomes an extension. The clutch assembly shoe 22 rotates, and the clutch shoe 24
When the clutch shoe 24 expands and contacts the inner peripheral surface of the clutch housing 26, the clutch shoe 24 sometimes intermittently contacts 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.

Normally, as shown in FIG. 7, the clutch housing 26 has a generally bowl-shaped structure as a single unit. 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, consider a triangle 34 used in music as shown in FIG. 8 as an example. 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. Then, when the striking bar 36 touches the vibrating triangle 34, the vibration sound of the triangle 34 disappears, and no sound is emitted.

FIGS. 9 and 10 show examples of various structures for suppressing the "squealing of the clutch housing" caused by various factors between the clutch shoe 24 and the inner peripheral surface of the clutch housing 26 (for example, actual opening). 63-193131). The principle is to adopt the principle shown in FIG. In the structure of FIG. 9 (referred to as a first conventional structure), the damping plate 38 has a substantially bowl-like shape formed of a plate material thinner than the clutch housing 26, and the center of the bottom of the bowl-like shape is omitted. A plate material (herein, this plate material is referred to as a vibration damping plate) 38 of the structural portion is prepared, and the vibration damping plate 38 is pressed into the outer periphery of the clutch housing 26 with a light pressure. At the bottom 26a, the bottom 38a of the damping plate 38 is fixed by, for example, spot welding. This vibration damping structure is generally as shown in FIG. Further, in the structure of FIG. 10 (referred to as a second conventional structure), a vibration damping plate 40 in which a band material is formed in a ring shape is press-fitted near an open end (edge portion 26a) of the clutch housing 26.

Here, a method of attaching the damping plates 38 and 40 to the clutch housing 26 will be considered. In the first structure, 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. Further, in the second structure, when only the rear portion (the bottom portion 26a side) of the side edge portion 26b of the clutch housing 26 and the rear portion 40a of the damping plate 40 are fixed, the edge portion of the damping plate 40 is fixed. Reference numeral 40b indicates a function like the hitting bar 36.

That is, in order to eliminate the abnormal noise generated between the clutch shoe 24 and the inner peripheral surface of the clutch housing 26, the clutch housing 26 and the vibration damping plates 38, 40 are required.
Need to function as a separate body, and the press-in allowance must be a value close to zero. The press-in allowance near zero is a state in which the clutch housing 26 and the vibration damping plates 38, 40 are in contact with each other or not, in other words, a state in which the clutch housing 26 sometimes contacts and sometimes separates from each other. When approximated, the vibration damping plate 3 such as a striking bar 36 for stopping vibration noise is applied to the bowl-shaped outer peripheral surface of the clutch housing 26 that vibrates, such as the triangle 34.
The edges 38 b, 40 b of 8, 40 will touch the edge 26 b of the clutch housing 26.

[0013]

However, the conventional vibration damping structure has the following problems. That is, in the vibration damping structure shown in FIG.
The clutch housing 26 and the clutch housing 26 are both manufactured by press drawing, but have a draft in the same direction because of the same shape. Therefore, the clutch housing 26
The press-in force is reduced over the entire axial width of the side edge 26b, and the press-fit state near the open end of the side edge 26b having a large vibration amplitude cannot be controlled. In this case, if the press-fitting allowance into the clutch housing 26 is too large, as shown in FIG. 12A, the vicinity of the bottom 38a of the vibration damping plate 38 is in close contact, but the end of the side edge 38b is opened. FIG. 12B shows that the press-fitting allowance is loose.
As shown in (1), the side edge portion 38b is entirely opened, and the damping effect is lost in any case. Therefore,
There is a problem that the vibration control effect varies because the press-fit state cannot be controlled.

Further, in the vibration damping structure shown in FIG. 10, in order to fix the vibration damping plate 40, it is necessary to press it firmly, that is, to take a large press-fitting allowance. 26 and the vibration damping effect is lost.

It is to be noted that the possibility that abnormal noise may occur due to the contact and disengagement of the housing member and the shoe member occurs in a frictional engagement device such as a brake device or another type of clutch device in addition to the centrifugal clutch device. That is.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is intended to ensure that the vibration-damping effect of the vibration-damping member can be exerted so that the space between the shoe member and the inner peripheral surface of the housing member can be obtained. It is an object of the present invention to provide a vibration damping structure for a housing of a friction engagement device that can surely eliminate abnormal noise generated in the above.

[0017]

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. And a housing damping structure for a frictional engagement device comprising an annular damping member externally fitted to the housing member.
A bottom fixed to the bottom of the housing member is provided, a flat surface and a concave portion following the flat surface are formed on the outer peripheral surface of the side edge portion of the housing member, and a boundary connected to the flat surface at an angle is formed in the concave portion,
The boundary is gradually formed from the flat surface to the bottom, with a smaller diameter,
The vibration damping corresponding to the flat surface at the tip of the housing member
The open end of the member is press-fitted to the outside, and the open end is
The frictional engagement device includes a housing vibration damping structure, which is in contact with the flat surface including a boundary .

[0018]

According to the present invention, a flat surface and a concave portion are formed on the outer peripheral surface of the housing member, and the damping member is brought into contact with the flat surface including the boundary between the flat surface and the concave portion. Even if the press-in allowance of the vibration member is large, the vibration-damping member surely comes into gentle contact with the outer peripheral surface of the housing member at the boundary, and the press-in allowance is approximated to zero. Damping members.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. Parts similar to those in FIGS. 5 to 12 are denoted by the same reference numerals, and description thereof is omitted. FIG. 1 is an overall sectional explanatory view of a vibration damping structure of a clutch device for a motorcycle according to an embodiment of the present invention, and FIGS. 2 to 4 are partial detailed views of FIG.

This embodiment is a housing vibration damping structure provided in a clutch device mounted on a power unit for a motorcycle similar to that shown in FIG. The vibration damping structure has a substantially bowl shape as a whole, and is formed in a cylindrical shape along the central axis C continuously to a bottom portion 48a extending outward from the central axis and an outer peripheral portion of the bottom portion 48a. (Equivalent to a housing member) having a side edge portion 48b, the clutch shoe 24 which comes into contact with and separates from the inner peripheral surface of the side edge portion 48b of the housing 48 and engages with and disengages from the housing 48; 48 is formed in a frictional engagement device including a substantially bowl-shaped vibration damping plate 50 fitted externally to 48.

Further, a side edge portion 48 of the housing 48 is provided.
The b outer peripheral surface, the flat surface 48d of the width L ₀ in the outer peripheral surface of the housing open end 48c is formed, and the flat surface 48
A concave portion 49 is formed at the end d through a tapered portion 49a. The tapered portion 49a has a smaller diameter so as to be gradually narrowed in a direction from the flat surface 48d toward the bottom portion 48a. The outer peripheral surface shape of the side edge portion of the housing 48 can be formed at the same time as when performing the drawing press working or at the time of performing the lathe working later. Further, the finish roughness can be appropriately selected.

The recess 49 is provided in the housing bottom 48.
a to the open end 48c.
8c is formed to have an outer diameter smaller than the outer diameter of the outer peripheral flat surface 48d (a position similar to the diameter of the flat surface 48d in FIG. 3 is indicated by a dashed line in FIG. 3), and is recessed. The portion 49a is connected at an angle to the edge of the bottom portion 48a on the bottom portion 48a side, and is formed to have substantially the same outer diameter almost entirely.

The damping plate 50 has the same structure as that of the damping plate 38 shown in FIGS. 9 and 11, and has a bottom portion so as to cover the outer peripheral surface of the bowl-shaped housing 48. A generally bowl-shaped damping plate 50 composed of 50a and side edge portions 50b is externally fitted with a press fit allowance. The outer fitting covers the concave portion 49 including a tapered portion 49a which is a boundary between the flat surface 48d and the concave portion 49, and is in contact with the flat surface 48d.

The damping plate 50 has a circular through hole 50a1 formed in the center of the bottom 50a. Further, the outer damper 50 is in fitting is in contact with the portion of the flat surface 48d of the width L ₀ which is formed at the open end portion 48c of the side edge portions 48b, it does not contact the other portions.

The width L ₀ of the flat surface in the axial direction of the housing 48 can be appropriately set to a length. For example, as shown in FIG. 4, the length of the side edge portion 48b is L
If it is set to ₁ , it is preferable that L ₀ ≦ L _1/2 . In this way, the damping plate 50 can be reliably brought into contact only with the open end 48c having the largest damping effect. The vibration damping plate 50 has a bottom portion 50a (corresponding to a portion other than the front edge portion) fixed to the housing 48 by welding.

The operation of the embodiment will be described. According to the embodiment, the flat surface 4 is formed on the outer peripheral surface of the side edge portion 48b of the housing 48.
8d and the concave portion 49 are formed, and the damping plate 50 is
The flat surface 48d is in contact with the tapered portion 49a, which is the boundary between the vibration control member 5 and the concave portion 49.
Even if the press-in allowance of 0 is large, the vibration damping member 50
Is surely gently in contact with the outer peripheral surface of the housing 48 by the tapered portion 49a, and the press-in allowance is approximated to zero.
The housing 48 is reliably damped at the gently contacting portion.

The damping effect is greatest when the vicinity of the open end 48c of the housing 48 is gently contacted by the damping plate 50. In the embodiment, a flat surface 48d is formed near the open end portion 48c, and the tapered portion 49a following the flat surface 48d is in contact with the damping plate 50, so that the damping effect is large.

Note that 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 of other brake devices and other clutch devices and the like. Can be applied as a vibration damping structure to various types of frictional engagement devices that engage with. It is clear that the configuration of the housing and the vibration damping member of the present invention is not limited by the above-described embodiment. That is, the positions and shapes of the concave portion and the flat surface formed in the housing are not limited to those in the above-described embodiment. For example, the concave portion can be formed substantially at the center of the side edge of the housing or near the open end. Further, the damping member may be formed in a strip shape as shown in FIG. 10 instead of the bowl shape.

[0029]

As described above, according to the present invention, the noise generated between the shoe member and the inner peripheral surface of the housing member can be reduced by ensuring that the vibration damping effect of the vibration damping member can be exerted. Can be 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.

FIG. 3 is a partial detailed view of the housing of FIG. 1;

FIG. 4 is a detailed view of a housing and a damping plate of FIG. 1;

FIG. 5 is an explanatory diagram of an engine equipped with a general centrifugal shoe clutch device.

FIG. 6 is an explanatory view of a general centrifugal shoe type clutch device.

FIG. 7 is an explanatory sectional view of the clutch housing of FIG. 6;

FIG. 8 is an explanatory diagram of a vibration sound of a triangle for explaining vibration of a clutch housing.

FIG. 9 is a cross-sectional configuration diagram of an example of a clutch housing in which a conventional damping plate is externally fitted.

FIG. 10 is a cross-sectional configuration diagram of another example of a clutch housing in which a conventional vibration damping plate is fitted.

FIG. 11 is a cross-sectional configuration diagram of an example of a clutch housing in which a conventional vibration damping plate is fitted.

FIGS. 12 (a) and (b) are explanatory diagrams of problems of the clutch housing in which the conventional vibration damping plate is fitted.

[Explanation of symbols]

 48 Clutch Housing 48a Clutch Housing Bottom 48b Clutch Housing Side Edge 48c Flat 49 Depression 49a Tapered 50 Damping Plate 50a Damping Plate Bottom 50b Damping Plate Tip Edge

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16D 11/00-23/14 F16D 41/00-47/06 F16D 49/00-71/04 F16F 15 / Ten

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 comes into contact with and separates from the 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 the housing vibration damping structure of the engagement device, a bottom fixed to the vibration damping member at a bottom of the housing member
A flat surface and a concave portion following the flat surface are formed on the outer peripheral surface of the side edge portion of the housing member, and are connected to the flat surface at an angle.
Form a boundary in the recess and move the boundary from a flat surface to the bottom.
To gradually reduce the diameter of the housing member.
The open end of the member is externally press-fitted, and the open end contacts the flat surface including the boundary of the concave portion.
Housing damping of the friction engagement device, characterized in that that.