JPH06313465A - Friction damping device - Google Patents

Abstract

PURPOSE:To stabilize frictional performance by providing an abrasion resistance washer part main body and a tooth part projected around the washer part main body and being fixed on a fixing part by its elastic rebound force, on a toothed-washer fixed on the fixing part provided on one side of both fixing member and rotating member and allowing interposition of a frictional member between itself and the other side thereof. CONSTITUTION:A friction damping device is provided with a toothed-washer 90 fixed on a fixing part 33 provided on either one of a fixed member 80 and a rotating member and allowing interposition of a frictional member 60 between itself and the other side thereof. The toothed-washer 90 is provided with a washer part main body 91 having a prescribed abrasion resistance performance against the frictional member 60, and a plurality of tooth parts 93 projected around the washer part main body 91 in a inner clip washer shape and being fixed on the fixing part 33 by elastic rebound force generated by bending deformation. Even if the fixed member 80 and the rotating member are made of materials which are uncongenial with the frictional member 60, for example the materials having such a property as being attacked by the frictional member 60 such as aluminum, and a frictional surface is formed by fixing a toothed washer 90 congenial with a frictional member such as iron so as to obtain stably sufficient frictional performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction damping device such as a friction brake, a friction clutch and a friction auto tensioner.

[0002]

2. Description of the Related Art Conventionally, a friction damping device is required to generate a stable frictional force on its friction surface. On the other hand, in automobiles and the like, a member made of a material such as aluminum or a magnesium alloy is used due to a demand for weight reduction of parts, and a friction surface may be provided between the member and a friction member made of, for example, resin. .

[0003]

However, the above-mentioned materials such as aluminum have a susceptibility to the resin such as PEEK resin, so that they are apt to be attacked by the resin to cause abrasion, and as a result, However, there is a problem that the friction performance of the friction surface becomes unstable. Therefore, a member made of a material having good compatibility with the resin (for example, iron or the like and having excellent wear resistance) is interposed between the member made of aluminum or the like and the friction member made of resin, and It is also conceivable to provide a friction surface with the resin.

On the other hand, if a member made of iron rotates together with a friction member made of resin, the friction performance becomes unstable. To avoid this, the member made of iron is made of aluminum or the like. Must be fixed to the member. As this fixing means, it is conceivable to provide a tightening margin and press fit. However, in the case of press-fitting, the dimensional accuracy between the members must be made extremely high in order to manage the tightening margin, and therefore there is a problem that the manufacturing cost becomes high.

It is also conceivable to use caulking as the fixing means, but there is a problem that quality control such as inspection of caulking force is costly and the manufacturing cost is high as in the case of press-fitting. In view of the above, the present invention provides a friction damping device that is capable of reliably sliding between a member having good compatibility with a friction member and the friction member to obtain stable friction performance, and that has a low manufacturing cost. The purpose is to provide.

[0006]

A friction damping device according to the present invention for achieving the above object is a friction damping device in which a friction member is interposed between mutually facing surfaces of a fixed member and a rotating member. A toothed washer fixed to a fixed portion provided on either one of the fixed member and the rotating member and having the friction member interposed between the toothed washer and the fixed member. A washer portion main body having a predetermined wear resistance with respect to the member, and a plurality of tooth portions projectingly formed around the washer portion main body in a chrysanthemum shape and fixed to the fixing portion by elastic repulsive force due to bending deformation. It is characterized by having.

[0007]

According to the structure of the present invention, even if one of the fixed member and the rotating member is made of a material having a poor compatibility with the friction member (for example, aluminum or the like, which is easily attacked by the friction member), To this, for example, by fixing a toothed washer that is compatible with the friction member and is excellent in wear resistance, such as iron, and by forming a friction surface between the toothed washer and the friction member, Sufficient friction performance can be stably obtained.

Further, in the case of press-fitting by a conventional tightening margin (by compression deformation), high dimensional accuracy is required between the press-fitting portion and the fixed portion, but in the present invention, the toothed washer is fixed to the fixed portion. Since it is performed by elastic repulsive force due to bending deformation of the tooth portion of the toothed washer, high dimensional accuracy is not required between the toothed washer and the fixed portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 2 is a vertical sectional side view of an auto tensioner as a friction damping device according to an embodiment of the present invention. FIG. 1 is an enlarged sectional view of the main part. 1 and 2
With reference to FIG. 1, this auto tensioner has a swinging arm 30 made of aluminum as a rotating member having a pulley 10 for winding a belt attached to a tip end thereof and an annular hub 31 serving as a rotation center on a base end side. And the hub 3 of the swing arm 30
1. A double cylindrical fixed case 20 that rotatably supports the swing arm 30 with the boss 21 penetrating the 1 and a fixed case 20. The swing arm 30 is rotated in a predetermined direction. A biasing torsion coil spring 40, an annular iron plate 80 as a fixing member fixed to the upper end surface of the boss 21 by a stepped bolt 52, and a fixing portion formed on the base end side upper surface of the swing arm 30. The toothed washer 90 made of iron fitted and fixed in the annular groove portion 33, and the toothed washer 90 interposed between the plate 80 and the toothed washer 90, for example, PEE
An annular friction member 60 made of K resin, and a disc spring 70 that elastically biases the hub 31 toward the plate 80 (upward) to exert a clamping force on the friction member 60 between the plate 80 and the toothed washer 90. Is equipped with.

This autotensioner has the friction member 6 described above.
The tension of the belt (not shown) wound around the pulley 10 is kept constant by the swinging resistance due to the frictional force generated between 0 and the plate 80 or the toothed washer 90. A shaft 50 is provided so as to project from the pivoting tip of the swing arm 30, and the pulley 10 is rotatably supported by the shaft 50 via a bearing 51. The hub 31 and the hub 31 are provided on the base end side of the swing arm 30.
A boss 32 concentric with the hub 31 is provided on the outer peripheral side of the. The torsion coil spring 40 is arranged between the outer circumference of the hub 31 and the inner circumference of the boss 32. The upper winding end of the torsion coil spring 40 is fixed to the swing arm 30 side,
The lower end side winding end is fixed to the fixed case 20 side.

Referring to FIG. 1, the fixed case 20 has a boss 22 concentric with the boss 21 radially outward of the boss 21, and the boss 21 is formed at an intermediate portion between the bosses 21 and 22. An annular seat portion 23, which is continuous with the base end and serves as a seat for the disc spring 70, is formed. A resin bush 71 made of nylon or the like is interposed between the outer circumference of the boss 21 of the fixed case 20 and the inner circumference of the hub 31 of the swing arm 30 to smoothly rotate the both. . The resin bush 71 has an annular flange portion 71a at the lower end.

A stopper 34, which is a pin-shaped projection, is integrally formed on a predetermined portion of the lower end surface of the hub 32 of the swing arm 30. The stopper 34 is an arc-shaped cutout groove 22 formed in the upper end portion on the inner peripheral side of the boss 22 of the fixed case 20.
It is housed in a and abuts against the wall surface of the cutout groove 22a when the swing arm 30 rotates, and restricts the swing arm 30 from rotating more than necessary.

In the stepped bolt 52, the stepped portion 52b is connected to the boss 21 on the fixed case 20 side while the plate 80 is pressed by the lower end surface of the upper surface flange portion 52a.
The plate 80 is fixed to the fixed case 20 by abutting against the bottom surface of the annular recess 21 a formed on the upper surface of the plate 80. The plate 80 includes the stepped portion 5 of the stepped bolt 52.
2b is an annular flat plate portion 81 and this flat plate portion 81.
A cylindrical portion 82 formed on the outer peripheral edge of the and protruding slightly downward.
The flat plate portion 82 has a protrusion 83 on the lower surface near the inner periphery. The protruding portion 83 is introduced into the notch groove 21b formed on the upper surface of the boss 21 of the fixed case 20 so that the plate 80 does not rotate relative to the fixed case 20.

A plurality of the disc springs 70 are arranged on the upper surface of the annular seat portion 23 of the fixed case 20, and the thrust washer 72 and the lower end flange portion 7 of the resin bush 71 are arranged.
The hub 31 is urged to the plate 80 side via 1a. The two-dot chain lines in FIGS. 3 and 4 show the toothed washer 90 in a free state, and the solid line in FIG. 4 shows the toothed washer 90 fitted in the annular groove 33. With reference to these drawings, the toothed washer 90 has a shallow cylinder portion 92 at the inner peripheral edge of an annular washer body 91, and the washer body 91
Has a plurality of tooth portions 92 projecting in a chrysanthemum shape. In the free state, these tooth portions 92 are inclined so that their tips extend radially outward. That is,
In FIG. 3, the diameter D is set to be larger than the diameter C. Further, the diameter C is equal to the diameter E of the annular groove 33 [see FIG.
(See (a)], which is slightly smaller than the toothed washer 9
It is easy to introduce 0 into the annular groove 33. Also, the diameter D
Is larger than the diameter E of the annular groove portion 33. Therefore, referring to FIGS. 5A and 5B, the toothed washer 90
Is introduced into the annular groove portion 33, the inclined tooth portion 92 is bent to a substantially upright state. And toothed washer 90
In the state that the ring is completely fitted into the annular groove 33, as shown in FIG.
As shown in (b), the toothed washer 90 is securely fixed to the inner wall surface of the annular groove portion 33 by the elastic repulsive force RF due to the bending deformation of the tooth portion 92. Moreover, the tip of the tooth portion 92 is in a state of biting into the inner wall surface of the annular groove portion 33, so that the fixing is more reliable.

According to this embodiment, between the friction member 60 made of PEEK resin and the swing arm 30 made of aluminum, which has a poor compatibility with the PEEK resin, the iron toothed member fixed to the swing arm side 30 is provided. By interposing the washer 90, a friction surface can be formed between the iron and the resin, and stable friction performance can be obtained. Moreover, in the case of press-fitting due to the conventional tightening allowance (due to compression deformation), high dimensional accuracy is required between the diameter of the annular groove 33 and the diameter of the press-fitting member in order to manage the tightening allowance. In the embodiment, since the toothed washer 90 is fixed to the annular groove portion 33 by the elastic repulsive force due to the bending deformation of the toothed portion 92 of the toothed washer 90, high dimensional accuracy is not required. Therefore, the processing cost can be reduced and the manufacturing cost can be reduced.

The present invention can be applied to a friction brake, a friction clutch, and the like, and various design changes can be made without changing the gist of the present invention.

[0017]

As described above, according to the present invention, even if one of the fixing member and the rotating member is made of a material having a poor compatibility with the friction member (having a susceptibility to the friction member). , By fixing a toothed washer having excellent wear resistance to the friction member to this, and providing a friction surface between the toothed washer and the friction member, sliding between members having good compatibility, Sufficient friction performance can be stably obtained.

Further, in the case of the conventional press-fitting due to the interference (compressive deformation), a high dimensional accuracy is required between the fixing portion and the fixing portion, but in the present invention, the toothed washer is fixed to the fixing portion. Since it is performed by elastic repulsive force due to bending deformation of the tooth portion of the toothed washer, high dimensional accuracy is not required between the toothed washer and the fixed portion. Therefore, the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part of an auto tensioner as a friction damping device according to an embodiment of the present invention.

FIG. 2 is an overall sectional view of an auto tensioner.

FIG. 3 is a partial cross-sectional side view of a toothed washer.

FIG. 4 is a plan view of a toothed washer.

FIG. 5 is a schematic view sequentially showing a process of introducing a toothed washer.

[Explanation of reference numerals] 30 swing arm (rotating member) 33 annular groove portion (fixing portion) 60 friction member 80 plate (fixing member) 90 toothed washer 91 washer portion main body 93 tooth portion

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 19, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art Conventionally, in a friction damping device, it is required that a friction surface generate a stable frictional force. On the other hand, in an automobile or the like, at the request of such lighter components, used is member made of a material such as aluminum or magnesium alloy, the member and material of the aluminum
There may be a case where a friction surface is provided between the resin-based friction member and the resin-based friction member having an aggressiveness . The above resin-based products are
In addition to the resin that is aggressive to the body, internal reinforcing fibers and friction
There are resins in which the number adjusting additive and the like are aggressive.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

[0003]

[0005] The above case, the material of aluminum or the like of the above, prone to wear under attack from a resin based friction member, as a result, a problem that friction performance of the friction surface becomes unstable was there. Therefore, between the above-mentioned member made of aluminum or the like and the resin-based friction member, the resin
Good compatibility with respect to system friction member (e.g. iron, excellent abrasion resistance) of the member made of a material is interposed, iron and resin
It is also conceivable to provide a friction surface with the friction member .

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

On the other hand, if the member made of iron rotates together with the resin- based friction member, the friction performance becomes unstable. Therefore, in order to avoid this, the member made of iron is made of aluminum or the like. Must be fixed to the member. As this fixing means, it is conceivable to provide a tightening margin and press fit. However, in the case of press-fitting, the dimensional accuracy between the members must be made extremely high in order to manage the tightening margin, and therefore there is a problem that the manufacturing cost becomes high.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 2 is a vertical sectional side view of an auto tensioner as a friction damping device according to an embodiment of the present invention. FIG. 1 is an enlarged sectional view of the main part. 1 and 2
With reference to FIG. 1, this auto tensioner has a swinging arm 30 made of aluminum as a rotating member having a pulley 10 for winding a belt attached to a tip end thereof and an annular hub 31 serving as a rotation center on a base end side. And the hub 3 of the swing arm 30
1. A double cylindrical fixed case 20 that rotatably supports the swing arm 30 with the boss 21 penetrating the 1 and a fixed case 20. The swing arm 30 is rotated in a predetermined direction. A biasing torsion coil spring 40, an annular iron plate 80 as a fixing member fixed to the upper end surface of the boss 21 by a stepped bolt 52, and a fixing portion formed on the base end side upper surface of the swing arm 30. Of the iron toothed washer 90 fitted and fixed in the annular groove 33, and the aluminum interposed between the plate 80 and the toothed washer 90.
Resin-based annular friction member 60 that has an attacking property against
And the hub 31 is elastically biased toward the plate 80 (upward), and the friction member 6 is interposed between the plate 80 and the toothed washer 90.
And a disc spring 70 that exerts a clamping force with respect to zero. The resin type with the above aggressiveness is attacked by itself.
For adjusting impact-resistant resin, internal reinforcing fiber and friction coefficient
There is a resin whose additive material has an aggressive property.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

A plurality of the disc springs 70 are arranged on the upper surface of the annular seat portion 23 of the fixed case 20, and the thrust washer 72 and the lower end flange portion 7 of the resin bush 71 are arranged.
The hub 31 is urged to the plate 80 side via 1a. The two-dot chain lines in FIGS. 3 and 4 show the toothed washer 90 in a free state, and the solid line in FIG. 4 shows the toothed washer 90 fitted in the annular groove 33. With reference to these drawings, the toothed washer 90 has a shallow cylinder portion 92 at the inner peripheral edge of an annular washer body 91, and the washer body 91
The outer periphery of, and has a plurality of teeth 9 3 formed to project chrysanthemum shape. These teeth 9 3, in a free state, is inclined so that the tip is expanded radially outward. That is,
In FIG. 3, the diameter D is set to be larger than the diameter C. Further, the diameter C is equal to the diameter E of the annular groove 33 [see FIG.
(See (a)], which is slightly smaller than the toothed washer 9
It is easy to introduce 0 into the annular groove 33. Also, the diameter D
Is larger than the diameter E of the annular groove portion 33. Therefore, referring to FIGS. 5A and 5B, the toothed washer 90
The when introduced into the annular groove 33, is bent to a state inclined teeth 9 3 is substantially upright. And toothed washer 90
In the state that the ring is completely fitted into the annular groove 33, as shown in FIG.
(B), the by the elastic repulsive force RF by teeth 9 3 of bending deformation, the toothed washer 90 is securely fixed to the inner wall surface of the annular groove 33. Moreover, the tip portion of the tooth portion 9 3, since a state as bite into the inner wall surface of the annular groove 33, the fixing becomes more reliable.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

According to this embodiment, the resin-based friction member 60
And an iron washer 90 made of iron fixed to the swing arm side 30 is interposed between the swing arm 30 made of aluminum, which has a poor compatibility with the iron and the resin arm.
By forming a friction surface between the friction member and the friction member , stable friction performance can be obtained. Moreover, in the case of press-fitting due to the conventional tightening allowance (due to compression deformation), high dimensional accuracy is required between the diameter of the annular groove 33 and the diameter of the press-fitting member in order to manage the tightening allowance. In the example, the toothed washer 9
Fixed to 0 in the annular groove 33, since is performed by the elastic repulsive force by the teeth 9 3 of the bending deformation of the toothed washer 90, a high dimensional accuracy is not required. Therefore, the processing cost can be reduced and the manufacturing cost can be reduced.

Claims (1)

[Claims] 1. A friction damping device in which a friction member is interposed between mutually facing surfaces of a fixed member and a rotating member, wherein a fixed portion provided on either one of the fixed member and the rotating member. The toothed washer is fixed to the other side, and the toothed washer is interposed between the toothed washer and the other, and the toothed washer has a predetermined wear resistance with respect to the frictional member.
And this washer is formed around the main body of the washer in the shape of a chrysanthemum,
A friction damping device having a plurality of tooth portions fixed to the fixing portion by elastic repulsive force due to bending deformation.