JPH07310754A - Dry multiple disk clutch - Google Patents

Abstract

PURPOSE:To restrict a friction plate from rising in its temperature excessively, in a dry multiple disc clutch. CONSTITUTION:In a dry multiple disc clutch, a hub flange 6 includes a boss 11, a flange 12 expanded from the boss 11 to the outer peripheral side, and a second cylindrical part 13 which is projected from the outer periphery to both sides in the axial direction and disposed in the inner periphery of a fly wheel ring 5. Plural annular drive plates 7 are engaged with the fly wheel ring 5, and plural annular driven plates 7 are engaged with the second cylindrical part 13. An air path opening 14 for making spaces on both sides in the axial direction conduct with each other is formed on the flange 12. Air path holes 19, 20 for making spaces outside and inside in the radial direction with each other are formed on both axial projected parts of the second cylindrical part 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry multi-plate clutch used in a vehicle.

[0002]

2. Description of the Related Art Generally, for example, a dry multi-disc clutch used for a racing automobile has a cylindrical flywheel ring fixed to a flywheel of an engine, a hub flange connected to an output shaft, and a space between the two. And a plurality of friction plates arranged in the. The hub flange includes a hub connected to the output shaft, a flange extending from the hub to the outer periphery, and a tubular portion provided on the outer periphery of the flange so as to project on both sides of the flange, and the tubular portion and the flywheel ring. A friction plate is arranged in the space between them. One end of the friction plate installation space faces a flywheel or the like against which the friction plate is pressed, and the other end faces a pressure plate against which the friction plate is pressed.

[0003]

According to the above structure, the friction plate installation space is closed at its inner circumference and outer circumference by the outer peripheral tubular portion of the hub flange and the flywheel ring, and has both ends at the flywheel, the pressure plate, and the pressure plate. It is closed with its outer clutch cover. In this structure,
The air flowing into the clutch from the outer space of the clutch can reach the surface of the friction plate in the vicinity thereof through the narrow gap between the pressure plate and the outer peripheral end of the hub flange. Therefore, the friction plate cannot be cooled effectively, and in particular, the cooling effect on the friction plate not adjacent to the pressure plate is extremely low. as a result,
The friction plate may be overheated, which may cause problems in operating characteristics and durability.

An object of the present invention is to prevent the temperature of the friction plate from rising excessively in the dry multi-plate clutch.

[0005]

A dry multi-plate clutch according to the present invention is a clutch for transmitting and blocking torque from an input side rotating body to an output side rotating body, and includes an input side member, a hub flange and a plurality of clutches. , An annular drive plate, a plurality of annular driven plates, and a clutch operating mechanism.

The input side member includes a first cylindrical portion connected to the input side rotating body. The hub flange is arranged on the inner circumference of the first tubular portion, the central hub being connected to the output-side rotating body, the flange spreading from the central hub to the outer peripheral side, and the axially protruding both sides from the outer circumference of the flange. A second tubular portion is included. The plurality of annular drive plates include a first tubular portion and a second tubular portion.
The outer peripheral portion is axially spaced apart from the cylindrical portion, and the outer peripheral portion is coupled to the inner peripheral surface of the first cylindrical portion so as to be relatively movable in the axial direction within a predetermined range and not relatively rotatable. . The plurality of annular driven plates are arranged alternately with the drive plate in the axial direction, and the inner peripheral portion is connected to the outer peripheral surface of the second tubular portion so as to be relatively movable in the axial direction and not relatively rotatable. The clutch operating mechanism is a mechanism for pressing and releasing the drive plate and the driven plate.
An air passage opening is formed in the flange so as to electrically connect the spaces on both sides in the axial direction. A first air passage is formed in both axially protruding portions of the second tubular portion so as to electrically connect spaces inside and outside in the radial direction.

It is preferable that a second air passage is formed in the first tubular portion so as to connect the space inside and outside in the radial direction. The second air passage preferably extends in the circumferential direction. It is preferable that the first air passage is a hole extending in the radial direction, and a groove that is radially aligned with the first air passage is formed on at least one surface of the drive plate and the driven plate.

[0008]

In the dry multi-plate clutch according to the present invention, when the clutch operating mechanism press-contacts the drive plate and the driven plate, the torque of the input side rotating body is transmitted to the hub flange, and the hub flange outputs to the output side rotating body. Go. Then, when the clutch operating mechanism releases the pressure contact between both plates, the torque transmission is interrupted.

[0009] Here, since the air passage openings for communicating the spaces on both sides in the axial direction are formed in the flange of the hub flange, external air is supplied to both sides of the flange. Further, since the first air passage for conducting the space inside and outside the radial direction is provided in the axially protruding portion of the second tubular portion, the air from the outside passes through the first air passage and passes through the drive plate. And is supplied to the pressure contact part of the driven plate to perform cooling. In this way, since the outside air is supplied to all the plates, excessive temperature rise of both plates can be suppressed. As a result, the life of both plates is extended.

In the case where the first tubular portion is formed with the second air passage for connecting the space inside and outside in the radial direction, the air supplied to the both plates from the outside flows to the outer peripheral side in the radial direction. Excessive temperature rise of the plate is suppressed. Second
When the air passage extends in the circumferential direction, since the area is large, excessive temperature rise of both plates can be suppressed.

If the first air passage is a hole extending in the radial direction, and at least one of the drive plate and the driven plate has a groove on its surface that coincides with the first air passage in the radial direction, the second cylinder. Since the air supplied to the plate portion efficiently passes through both plate portions and is cooled, excessive temperature rise of both plates is suppressed.

[0012]

1 is a sectional view of a dry multi-plate clutch 1 for an automobile according to an embodiment of the present invention, and FIG. 2 is a partial cutaway view II of FIG. The dry multi-plate clutch 1 is a device for transmitting and blocking torque from a flywheel 2 of an engine (not shown) to an input shaft 3 (only the center line is shown) of a transmission. This dry multi-plate clutch 1 is mainly
A flywheel ring 5 (first tubular portion) which is an input side member, a hub flange 6 which is an output side member, a plurality of drive plates 7 and a plurality of which are arranged between the flywheel ring 5 and the hub flange 6. And a clutch cover assembly 10 for pressing and releasing the plates 7, 8 from each other.

The hub flange 6 has a boss 11 arranged at the center, and a flange 1 that integrally extends from the boss 11 to the outer peripheral side.
2 and a second tubular portion 13 integrally provided on the outer circumference of the flange 12. At the center of the boss 11, a spline hole 11a that meshes with spline teeth of the input shaft 3 of the transmission is formed. As a result, the hub flange 6 is axially movable with respect to the input shaft 3 of the transmission. Hub flange 6 flange 1
2 includes a plurality of air passage openings 1 circumferentially spaced from each other.
4 is provided. As is apparent from FIG. 1, the air passage openings 14 connect the clutch internal spaces 56 and 57 on both sides of the flange 12 to each other. The second tubular portion 13 projects from the flange 12 on both sides in the axial direction. External teeth extending in the axial direction are formed on the outer periphery of the second tubular portion 13. In other words, the second tubular portion 13 has a large number of engaging grooves 1 extending in the axial direction.
8 are provided at intervals in the circumferential direction. Second tubular portion 1
A plurality of air passage holes 19 and 20 are provided in the portions projecting to both sides of the shaft 3 in the axial direction. Air passage hole 1
The reference numerals 9 and 20 respectively penetrate the second tubular portion 13 substantially in the radial direction, and the ends on the outer side in the radial direction open to the bottom of the engagement groove 18. As is clear from FIG. 2, the air passage holes 19 are provided at a plurality of positions at intervals in the circumferential direction of the second tubular portion 13.

A flywheel ring 5 is concentrically arranged on the outer side in the radial direction of the second tubular portion 13. The end of the flywheel ring 5 on the left side in FIG. 1 is fixed to the flywheel 2 of the engine by a plurality of bolts 22 (only the center line is shown). The flywheel ring 5 has internal teeth, in other words, a large number of engagement grooves 23 extending in the axial direction and arranged at intervals in the circumferential direction. FIG. 4 is a view on arrow IV in FIG. As shown in FIGS. 1 and 4, air passage grooves 24 are provided at a plurality of locations (for example, three locations) axially spaced on the outer peripheral surface of the flywheel ring 5. Figure 1
As shown in, the air passage groove 24 is provided outside the driven plate 8 in the radial direction. As is clear from FIG.
The air passage grooves 24 are provided at a plurality of positions that are circumferentially spaced at each position that is spaced apart in the axial direction of the flywheel ring 5 (that is, on the same circumference). Each of the air passage grooves 24 extends in an arc shape along the circumferential direction of the flywheel ring 5, and the bottom portion thereof opens to the bottom surfaces of the plurality of engagement grooves 23. That is, each air passage groove 24 opens to the outer peripheral surface of the flywheel ring 5 and communicates with the bottom space of the plurality of engagement grooves 23. Since the air passage groove 24 extends in the circumferential direction, the flywheel ring 5 is light.

A friction plate group 9 is arranged between the inside of the flywheel ring 5 and the second tubular portion 13 of the hub flange 6. The friction plate group 9 is arranged axially between the friction surface of the flywheel 2 and an annular pressure plate (described later). The friction plate group 9 is composed of four drive plates 7 and three driven plates 8 which are arranged alternately in the axial direction. The drive plate 7 and the driven plate 8 are dry annular friction plates, both of which are arranged concentrically with the input shaft 3 of the transmission. The drive plate 7 is provided with radial projections 26 on its outer peripheral portion, and the projections 26 are engaged with the engagement grooves 23 of the flywheel ring 5 so as not to rotate relative to each other and slidably in the axial direction. The driven plate 8 is a radial projection 2
7 is provided on the inner peripheral portion, and the protrusion 27 is engaged with the engaging groove 18 of the second tubular portion 13 so as not to be relatively rotatable and slidable in the axial direction. A plurality of shallow grooves 8a are radially provided on the surface of the driven plate 8. Each groove 8a extends from the inner periphery of the driven plate 8 to the outer periphery thereof, and the air passage hole 1
They are arranged so as to be substantially in line with 9, 20.

The clutch cover assembly 10 includes a clutch cover 28, an annular pressure plate 29 disposed inside the clutch cover 28, and the pressure plate 2.
A diaphragm spring 30 for urging the flywheel 2 toward the flywheel 2 and a support mechanism 31 for supporting the diaphragm spring 30 on the clutch cover 28 are mainly provided.

The clutch cover 28 is fixed to the end surface of the flywheel ring 5 by the above-mentioned bolt 22.
The clutch cover 28 is made of metal, mainly aluminum, and is lightweight. Pressure plate 29
Is arranged on the right side in FIG. 1 of the drive plate 7 arranged closest to the clutch cover 28 side. The pressure plate 29 is provided with radial protrusions 32 on its outer peripheral portion, and the protrusions 32 engage with the engaging grooves 23 so as not to be rotatable relative to each other but to be slidable in the axial direction. A raised portion 33 having a semicircular cross section is integrally provided on the inner surface of the rear surface (the surface opposite to the driven plate 8) of the pressure plate 29.

As shown in FIG. 2, the diaphragm spring 30 is composed of an annular portion 30a and a plurality of lever portions 30b extending inward in the radial direction from the inner circumference of the annular portion 30a. The lever portions 30b are provided at equal intervals in the circumferential direction, slits are formed between the adjacent lever portions 30b, and at the radially outer portion of each slit,
A notch 30c having a relatively wide circumferential width is formed.

The support mechanism 31 includes a pair of first wire ring 35 and second wire ring 36 for supporting the inner peripheral portion of the annular portion 30a of the diaphragm spring 30, and a plurality of bolts for fixing the wire rings 35, 36 to the clutch cover 28. 37 and mainly. A pair of wirings 35,
36 is made of steel. The wire rings 35 and 36 extend along the diaphragm spring 30, and are provided with ring bodies 38 and 39 on their outer peripheral portions, respectively. The ring bodies 38 and 39 are respectively the diaphragm spring 30.
Has a convex cross section such as a semicircle. The ring body 38 of the first wire ring 35 contacts the diaphragm spring 30 from the clutch cover 28 side (right side in FIG. 1), and the ring body 3 of the second wire ring 36
9 contacts the diaphragm spring 30 from the hub flange 6 side (left side in FIG. 1). Ring body 38
A thin seating portion 40 that extends annularly on the inner peripheral side of FIG.
Are integrally formed. A plurality of leg portions 41 extending in the axial direction are integrally formed on the seating portion 40 at intervals in the circumferential direction. A thin annular portion 42 that extends annularly is integrally formed on the inner peripheral side of the ring body 39 on the left side of FIG. The annular portion 42 has a plurality of protrusions 4 extending in the axial direction.
3 are integrally provided at intervals in the circumferential direction. Protrusion 4
3 is also continuous to the inner circumference of the ring body 39. Leg 41
1 and the protrusion 43 project toward each other.
In the assembled state shown in FIG. 3, the leg portion 41 passes through the notch 30c of the diaphragm spring 30 and the front end surface is seated on the protrusion 43.

The inner end surface of the clutch cover 28 is provided with a notch on which the back surface of the seat portion 40 of the first wire ring 35 and the inner peripheral surface and the outer peripheral surface are seated, and the wire ring 35 is seated in this notch. It is fixed by the bolt 37. A bolt insertion hole (a hole not provided with a screw) through which the bolt 37 is inserted is provided in each leg portion 41 and the seating portion 40 continuous with the leg portion 41 in the first wiring 35, and the bolt insertion hole is concentric with the bolt insertion hole. Is also provided on the clutch cover 28. A screw hole is provided in the protruding portion 43 of the second wire ring 36 and a portion of the annular portion 42 continuous with the protruding portion 43, and the screw portion of the bolt 37 is fixed to the screw hole.

As described above, the plurality of bolts 37
Thus, the wirings 35 and 36 are fixed to the clutch cover 28. And these wirings 35,
The outer peripheral portion of the annular portion 30 a of the diaphragm spring 30 supported by 36 abuts on the raised portion 33 of the pressure plate 29, and biases the pressure plate 29 toward the flywheel 2 side (left side in FIG. 1).

A release bearing 50 is arranged adjacent to the inner peripheral portion of the diaphragm spring 30. When the release bearing 50 pushes the tip of the lever portion 30b of the diaphragm spring 30 toward the flywheel 2, the outer periphery of the annular portion 30a of the diaphragm spring 30 separates from the pressure plate 29. As a result, the clutch connection is released.

In the above structure, the hub flange 6 is axially movable with respect to the input shaft 3 of the transmission, and therefore the hub flange 6 needs to be positioned in the axial direction. Therefore, as shown in FIG. 1, a positioning pin 51 extending in the radial direction is attached to the second tubular portion 13 of the hub flange 6. The positioning pin 51 is a roll pin having a slit. A mounting hole 52 extending in the radial direction is provided in a portion of the second tubular portion 13 projecting from the flange 12 toward the flywheel 2, and the positioning pin 51 is fixed in the mounting hole 52 in a compressed state. The positioning pin 51 has a mounting hole 5 at the middle portion in the longitudinal direction.
2 and is fitted between the protrusions 27 of the two driven plates 8 with only one end thereof entering the engaging groove 18.

The flywheel 2 and the pressure plate 29 described above limit the axial movement range of the drive plate 7 and the driven plate 8. By positioning the positioning pin 51 between the protrusions 27 of the two driven plates 8 whose axial positions are limited in this way,
The axial position of the hub flange 6 is also limited within a predetermined range.

Next, the operation will be described. In the clutch connected state, the release bearing 50 does not press the diaphragm spring 30 toward the flywheel 2 side, and the elastic force of the diaphragm spring 30 itself presses the pressure plate 29 toward the friction plate group 9 side. This allows
The drive plate 7 and the driven plate 8 are pressed against each other, and the torque input from the flywheel 2 to the flywheel ring 5 is transmitted to the hub flange 6 via the drive plate 7 and the driven plate 8, and further,
Output from the hub flange 6 to the input shaft 3 of the transmission.

When the clutch is disengaged, the tip of the lever portion 30b of the diaphragm spring 30 is pushed toward the flywheel 2 by the release bearing 50, and the outer peripheral portion of the annular portion 30a of the diaphragm spring 30 is moved away from the pressure plate 29. As a result, the pressure contact force between the drive plate 7 and the driven plate 8 is released, and the clutch is disengaged.

In the above operation, the diaphragm spring 30 is deformed while being supported by the wire rings 35 and 36. The deformation causes the wirings 35 and 36 to move with respect to the clutch cover 28. However, for the clutch cover 28, the first wiring 3
The seat 40 of No. 5 is in contact. That is, the area of the seating surface of the first wiring 35 with respect to the clutch cover 28 is wider than before, and therefore the surface pressure is small. As a result, even when the wirings 35 and 36 are made of steel and the clutch cover 28 is made of a material mainly composed of aluminum as in the conventional structure, the abrasion of the clutch cover 28 by the wiring 35 is effectively prevented. It

Further, the inner end surface of the clutch cover 28 is provided with notches for seating the back surface of the seating portion 40 of the first wire ring 35 and the inner and outer peripheral surfaces thereof.
The first wiring 35 does not easily slide on the clutch cover 28. As a result, wear of the clutch cover 28 is unlikely to occur. Further, since the second wiring 36 does not contact the clutch cover 28, the clutch cover 28 is less worn.

Further, although the first wiring 35 and the second wiring 36 tend to move relative to each other, they are generally made of steel, so that they are not easily worn. In the clutch connection / disconnection operation described above, heat due to friction is generated in the drive plate 7 and the driven plate 8. However, as described below, the drive plate 7 and the driven plate 8 are effectively cooled by air, and an abnormal temperature rise of them occurs. To be prevented.

Flange 12 and diaphragm spring 3
Low-temperature air flows into the inner space 56 between 0 and the outer space 58 of the clutch. A part of this air flows into the internal space 57 through the air passage opening 14. Internal space 5
The air in 6, 57 is generated by the centrifugal force or the like in the air passage hole 1
It flows through the engaging grooves 18 through 9 and 20, flows from the engaging groove 18 along the surfaces of the drive plate 7 and the driven plate 8 to the engaging groove 23, and cools the drive plate 7 and the driven plate 8 in the meantime. This air is the engaging groove 2
3 through the air passage groove 24 to flywheel ring 5
To the outside of the. As a result, all drive plates 7 and driven plates 8 are cooled substantially uniformly and sufficiently. Since the groove 8a formed in the driven plate 8 is aligned with the air passage holes 19 and 20 in the radial direction, the air flow becomes smooth, and the drive plate 7 and the driven plate 8 are cooled more effectively. Is done.

Wear powder is generated on the surfaces of the drive plate 7 and the driven plate 8. The wear powder also flows out from the engagement groove 23 through the air passage groove 24 to the outside of the flywheel ring 5. In particular, since the air passage groove 24 is formed so as to extend in the circumferential direction, the opening area is large, and the effect of cooling the plates 8 and 9 and discharging the abrasion powder is enhanced.

In the above-described structure, the positioning pin 51 is attached to the hub flange 6, but only one end of the positioning pin 51 is located in the engagement groove 18, and the other portions are located beyond the engagement groove 18. Is also located radially inward. Therefore, the increase in the moment of inertia of the hub flange 6 due to the positioning pin 51 is suppressed as compared with the conventional structure having the tangential positioning pin 60 (FIG. 2, only the pin 60 shows a conventional example). By reducing the moment of inertia of the hub flange 6, the responsiveness of the clutch to the connection operation and the disconnection operation becomes high. [Modification] (a) In the modification shown in FIG. 5, the positioning pin 51 is formed of a hollow bolt, and the threaded portion is attached to the screw hole (mounting hole 52) of the second tubular portion 13 and the non-threaded portion. Is the engaging groove 18
It's getting in.

(B) In the modification shown in FIG. 6, the positioning pin 51 is press-fitted into the mounting hole 52. A large-diameter flange 61 is provided at one end of the positioning pin 51, and the large-diameter flange 61 engages with the inner peripheral surface of the second tubular portion 13, whereby the positioning pin 51 is radially outwardly moved by centrifugal force. It prevents it from falling off.

[0034]

In the dry multi-plate clutch according to the present invention, the outside air is supplied to both sides of the flange through the air passage opening of the flange, and further passes through the first air passage of the second tubular portion to drive the drive. It is supplied to the pressure contact part of the plate and the driven plate to cool it. In this way, since the outside air is supplied to all the plates, excessive temperature rise of both plates can be suppressed. As a result, the life of both plates is extended.

When a second air passage is formed in the first tubular portion for connecting the space inside and outside in the radial direction, the air supplied from the outside to both plates flows to the outer peripheral side in the radial direction, so Excessive temperature rise of the plate is suppressed. Second
When the air passage extends in the circumferential direction, since the area is large, excessive temperature rise of both plates can be suppressed.

If the first air passage is a hole extending in the radial direction, and at least one of the drive plate and the driven plate has a groove on its surface that coincides with the first air passage in the radial direction, the second cylinder. Since the air supplied to the plate portion efficiently passes through both plate portions and is cooled, excessive temperature rise of both plates is suppressed.

[Brief description of drawings]

FIG. 1 is a sectional view of a dry multi-plate clutch for an automobile according to an embodiment of the present invention.

FIG. 2 is a partial cutaway view II of FIG.

FIG. 3 is an exploded perspective partial view of a wiring.

FIG. 4 is a view on arrow IV in FIG. 1.

FIG. 5 is a partial sectional view showing a positioning pin according to another embodiment.

FIG. 6 is a partial sectional view showing a positioning pin according to still another embodiment.

[Explanation of symbols]

 1 dry multi-plate clutch 2 flywheel 3 transmission input shaft 5 flywheel ring 6 hub flange 7 drive plate 8 driven plate 8a groove 11 boss 12 flange 13 second tubular portion 14 air passage opening 19, 20 air passage hole 24 air Passage groove

Claims (4)

[Claims] 1. A dry multi-plate clutch for transmitting and blocking torque from an input side rotating body to an output side rotating body, the input side member including a first tubular portion connected to the input side rotating body. A central hub connected to the output-side rotating body, a flange extending from the central hub to the outer peripheral side, and axially protruding from the outer periphery of the flange on both sides in the axial direction, and arranged on the inner periphery of the first tubular portion. A hub flange including a second tubular portion, and the first tubular portion and the second tubular portion are axially spaced from each other, and the outer peripheral portion is the first tubular portion. A plurality of annular drive plates connected to the inner peripheral surface of the shaft so as to be relatively movable and non-rotatably within a predetermined range in the axial direction; Ability to move relative to the outer peripheral surface of the cylindrical part in the axial direction but not to rotate relative to it A plurality of connected annular driven plates and a clutch operating mechanism for pressing and releasing the drive plate and the driven plate are provided, and the flange has an air passage opening for electrically connecting spaces on both sides in the axial direction. A dry multi-plate clutch in which a first air passage that connects the space inside and outside in the radial direction is formed in both portions of the second tubular portion that project in the axial direction. 2. A second air passage is formed in the first tubular portion so as to connect spaces inside and outside in the radial direction.
Dry multi-disc clutch described in. 3. The dry multi-plate clutch according to claim 1, wherein the second air passage extends in the circumferential direction. 4. The first air passage is a hole extending in a radial direction, and at least one surface of the drive plate and the driven plate has a groove on its surface that coincides with the first air passage in a radial direction. The dry multi-plate clutch according to any one of claims 1 to 3, which is provided.