JPH0647138Y2 - Clutch disc wear limit warning structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a clutch disc wear limit warning structure, and more particularly to a clutch disc wear limit warning structure for a manual transmission for automobiles and industrial vehicles.

(Prior Art) As a conventional wear limit warning structure for a clutch disc in a manual transmission for an automobile,
There is something like the one shown in the figure (for example, the actual development Sho 59-195,229
(See the official gazette).

This allows the clutch disc 10 of the clutch 1 on the drive shaft 2 of the automobile to be narrowed or separated by the flywheel 3 and the pressure plate 4, and from the peripheral edge of the center plate 11 of the clutch disc 10. , The contact pieces 15, 15 protruding toward the left and right sides in FIG. 4 are provided, and the length of the contact pieces 15, 15 is set to the center plate.
Rivets on both sides of 11 14 Clutch facing 1 stopped
When 2 and 13 reach the wear limits δ ₁ and δ ₂ (see the enlarged cross-sectional portion of the end of the center plate 11 in the figure), the contact piece 15,
Flywheel 2 or pressure plate 4 at the end of 15
The contact surfaces 15, 15 contact the flywheel 3 and / or the pressure plate 4, and the metallic noise generated when the contact surfaces cause the clutch facing 1
It informs the wear limit of 2 and 13.

Although not shown, it has also been proposed to provide a sensor on the center plate of the clutch disc, which detects a wear of the clutch facing when it reaches a limit value and generates a signal.

Furthermore, selection (design) of total pressure load characteristics of the clutch cover
Accordingly, there is also known that when the wear amount of the clutch facing reaches the limit value, the clutch starts to slip to notify that the clutch facing reaches the wear limit.

In addition, when a coloring material is embedded on the back plate side of the brake pad (clutch facing corresponding part) of the disc brake, and when the brake pad is worn for a predetermined amount or more, the coloring material is attached to the brake disc to limit the wear of the brake pad. There is also known a brake pad wear limit display device for a disc brake, which is configured to notify the user (for example, see Japanese Utility Model Laid-Open No. 55-45,051).

Further, although not shown, in Japanese Utility Model Publication No. 61-84,228,
A structure in which a clutch facing having a high friction coefficient layer on the outside and a low friction coefficient layer on the inside is mounted on one or both sides of the center plate is disclosed in Japanese Utility Model Publication No. 49-65,863. It is described to dispose a coating material between the inner and lower friction coefficient layers, and in Japanese Utility Model Laid-Open No. 61-182,430, a low friction coefficient layer is provided inside the outer high friction coefficient layer. Is provided, and the high friction coefficient layer and the low friction coefficient layer are formed in a segment shape with respect to each other, and are alternately arranged in the circumferential direction.

(Problems to be Solved by the Invention) However, in the conventional clutch disk wear limit warning structure in the conventional automobile manual transmission as shown in FIG. 4, the wear amount of the clutch facings 12 and 13 reaches the limit value. After reaching, the contact piece 15 protruding from the end of the center plate 11 of the clutch disc 10,
Clutch facing due to metallic noise generated by contact between 15 and flywheel 3 or pressure plate 4 surface
Since 12 and 13 announced that the wear limit (δ ₁ , δ ₂ ) had been reached, the metal noise generated by the contact caused
Although it can be surely notified that the clutch facings 12 and 13 have reached the wear limit, there is a problem in that the flywheel 3 or the pressure plate 4 surface is damaged due to contact with the touch pieces 15 and 15.

Also, in the case where the center plate of the clutch disc is provided with a sensor that detects a wear exceeding the limit value of the clutch facing and issues a warning signal, not only the structure becomes complicated but also the reliability of the sensor is improved. There is a problem in that the cost is considerably increased to raise the cost.

Furthermore, by selecting the total pressure load characteristics of the clutch cover,
When the wear amount of the clutch facing exceeds the allowable limit,
In the case of a structure that slides abruptly, slippage may occur due to a comparatively small amount of wear due to variations in the total load characteristics of the clutch cover and uneven wear of the clutch facings on both sides of the center plate. Inevitably, the rivets for fixing the clutch facings will be attached to the flywheel 2 and / or the pressure plate 4 due to uneven wear.
Since it comes into contact with the surface and scrapes off, there is no choice but to design on the safe side, and it is actually difficult to use the clutch facing to its limit range.

In any of the above-mentioned conventional examples, the operator who is driving the vehicle may not notice the various notifications described above and may continue driving as it is.
There is a problem that the rivet 14 or the like for attaching the center plate 11 to the center plate 11 may come into contact with the surface of the flywheel 3 or the pressure plate 4 and cause damage.

Further, assuming that the wear amount display device of the brake pad of the disc brake described in Japanese Utility Model Laid-Open No. 55-45051 is diverted to a clutch disc, even in this case, the driver also has a wear degree display device. There is a problem in that it is not possible to confirm that the clutch facing has reached the wear limit unless the display state by is positively viewed.

Further, Japanese Utility Model Application Laid-Open No. 61-84,228 discloses a structure in which a clutch facing having a high friction coefficient layer on the outside is mounted on one side or both sides of the center plate.
-182,430 gazette describes the use of high friction material and low friction material for the cladding, and further, the above-mentioned Japanese Utility Model Publication No. 49-65,863 discloses the set wear allowance from the surface of the clutch facing. Although it is disclosed to use a material in which a coating material is embedded in a portion having a thickness of 1, the friction coefficient of the coating material is an intermediate friction coefficient material between the high and low friction coefficient material layers. Since there is no disclosure about arranging the intermediate friction coefficient material layers between the high and low friction coefficient material layers, neither of them has a sharp friction coefficient. However, there is a problem similar to each of the known examples shown above due to the contact of different materials.

This invention was made by paying attention to the problems of the conventional example as described above, and a clutch facing having a high friction coefficient layer on the outside and a low friction coefficient layer on the inside is attached to one or both sides of the center plate. In addition, between the outer high friction coefficient layer and the inner low friction coefficient layer, an intermediate friction coefficient layer of both the high and low layers is arranged, or the friction coefficient of the intermediate friction coefficient layer is changed from the outer side to the inner side. By gradually decreasing it,
It is an object of the present invention to provide a clutch disc wear limit warning structure which does not have the above-mentioned problems.

(Means for Solving the Problems) The present invention, in order to solve the above problems, on one or both sides of the center plates 31, 41, 61, the high friction coefficient layers 32A, 33A, 42A, 43A on the outside, 62A, 63A, while mounting the clutch facing 32, 33, 42, 43, 62, 63 having low friction coefficient layers 32C, 33C, 42C, 43C, 62C, 63C inside,
The outer high friction coefficient layers 32A, 33A, 42A, 43A, 62A, 63A
And inner low friction coefficient layers 32C, 33C, 42C, 43C, 62C, 63C, between the high and low friction coefficient layers intermediate friction coefficient layers 32B, 33B,
42B, 43B, 62B, 63B are arranged.

(Operation) Since the present invention has the above-mentioned configuration, when the clutch facing reaches the wear limit due to the use of the clutch disc, the flywheel or the pressure plate comes into contact with the low friction coefficient layer of the clutch facing. Prior to the occurrence of large slippage, contact with the intermediate friction coefficient layer disposed between the outer high friction coefficient layer and the inner low friction coefficient layer of the clutch facing, or the intermediate friction coefficient layer whose friction coefficient gradually decreases Occurs, the transmission torque at the use limit of the clutch facing is gradually reduced or gradually reduced, and is transmitted to the driver.

(Embodiment) The first to third embodiments of the wear limit warning structure for a clutch disc according to the present invention will be described below with reference to FIGS. 1 and 2 showing longitudinally the essential parts thereof and an inner perspective view of the clutch facing. This will be described with reference to FIG. The clutch discs of the respective embodiments are arranged and used in place of the clutch disc 10 between the flywheel 3 and the pressure plate 4 of the clutch 1 similar to the conventional example shown in FIG.

(First Embodiment) FIG. 1 is a longitudinal sectional view of an essential part of a first embodiment of the present invention. In the figure, 30 is a clutch disc, 31 is a center plate, and 32 and 33 are rivets 34 on both sides of the center plate 31.
With the clutch facings stopped, these clutch facings 32, 33 are composed of high friction coefficient layers 32A, 33A, intermediate friction coefficient layers 32C, 33C and low friction coefficient layers 32B, 33B, and their holes.
The 32E and 33E parts are fixed to the center plate 31 with rivets 34. Note that 32D and 33D are wear limit surfaces.

Next, the operation of this embodiment will be described.

The clutch disk 30 is provided on the drive shaft 2 as in the conventional example shown in FIG. 4, and the torque is transmitted or cut off by being sandwiched or separated by the flywheel 3 and the pressure plate 4. In this embodiment, by using the clutch disc 30, the clutch facing 3
When the high friction coefficient layers 32A, 33A of 2, 33 wear and reach the wear limit surfaces 32C, 33C, the flywheel 3 or the pressure plate 4 does not immediately contact the low friction coefficient layers 32C, 33C, First, since it comes into contact with the intermediate friction coefficient layers 32B and 33B, wear of the clutch facings 32 and 33 (use)
The transmissible torque in the vicinity of the limit will gradually decrease. As a result, the driver using the clutch disc 30 immediately senses that the clutch facings 32, 33 have reached the wear limit, and shifts to the replacement preparation posture.

Even if the detection by the driver that the use limit of the clutch facings 32 and 33 has been reached is slightly delayed, before the low friction coefficient layers 32B and 33B come into contact with the flywheel 3 or the pressure plate 4, Since it comes into contact with the intermediate friction coefficient layers 32B and 33B, the transferable torque in the vicinity of the wear (use) limit of the clutch facings 32 and 33 gradually decreases, and the clutch 1 slips to reduce the transfer torque. It is a so-called fail-safe because it does not pose any particular danger.

Moreover, since the clutch facings 32 and 33 on both sides are hardly worn at the same time at the same time, the transmission torque immediately before the wear limit of the clutch facings 32 and 33 on both sides is only about four-half when the normal contact is made on both sides. So, there is no problem in normal slow running.

In addition, the clutch facing 32 to the center plate 31,
Although not shown, the attachment of 33 may be performed by directly bonding the low friction coefficient layers 32C and 33C to the surface of the center plate 31 without using the rivets 34, by baking, etc. In this case, the low friction coefficient layer 32C and 33C can be made quite thin.

(Second Embodiment) FIG. 2 is a vertical cross-sectional view of the essential parts of a second embodiment of the clutch disc wear limit warning structure according to the present invention. In the figure, 40 is a clutch disc, 41 is a center plate, and 4
2 and 43 are clutch facings, and these clutch facings 42 and 43 are high, medium and low friction coefficient layers 42A, 42B and 42C.
And 43A, 43B, and 43C are integrally bonded and configured (in this respect, the configuration is similar to that of the first embodiment), and the clutch facings 42 are disposed on the left and right sides of the center plate 41.
Left and right high friction coefficient layers 42A and 43A, and medium friction coefficient layers
42B and 43B and low friction coefficient layers 42C and 43C, especially the left and right middle friction coefficient layers 42B and 43B, respectively, which are made of different friction coefficient materials, in this case high friction coefficient layers 42A, 43A
The transmission torque after the wear of the is reduced more gradually.
Note that 42D and 43D are wear limit surfaces.

Also, in this second embodiment, the clutch facings 42 and 43 are made of three different friction coefficient materials (42,
A, 43A, 42B; 43B, 42C, 43C), in particular
Since the intermediate friction coefficient layers 42B and 43B are configured to be considerably thicker than the first embodiment, the high friction coefficient layer 42
The transmission torques in the medium friction coefficient layers 42B and 43B after the wear of A and 43A decrease more gently than in the first embodiment.

(Third Embodiment) FIG. 3 is a longitudinal sectional view of essential parts of a third embodiment of the clutch disc wear limit warning structure according to the present invention and a distribution curve diagram of the effective friction coefficient of the clutch facing 63 on one side thereof. Is.

In FIG. 3, 60 is a clutch disc, 61 is a center plate, 62 and 63 are clutch facings, and the clutch facings 62 and 63 are high friction coefficient layers 62A and 63A and an intermediate friction where the friction coefficient gradually decreases from high to low. It consists of three layers, coefficient layers 62B and 63B and low friction coefficient layers 62C and 63C. The friction coefficient of the clutch facings 62 and 63 is as shown in the distribution curve diagram of the effective friction coefficient shown in the upper part of FIG. (However, in the figure, the friction coefficient distribution curve of only the clutch facing 63 is shown.) The transmission torque in the intermediate friction coefficient layers 62B and 63B is along the friction coefficient distribution curve of FIG. Taper off.

(Effect of the Invention) Since the present invention has the above-mentioned configuration and operates,
The following effects can be obtained.

(1) Since the clutch facing having the low coefficient material layer is arranged on one or both sides of the center plate of the clutch disc through the intermediate coefficient material layer following the high friction coefficient material layer, the wear limit area of the clutch facing is located. Transmission torque gradually decreases, and warns the driver, who is in a normal operating condition, that the clutch facing has reached the wear limit, and the rivet attached to the clutch facing causes the flywheel and / or pressure plate to move. Damage can be prevented.

(2) Since the high friction coefficient layer of the clutch facing can be used up to its limit range without damaging the flywheel and / or the pressure plate, the clutch facing having the same function can be made thinner than the conventional example.

(3) A low friction coefficient layer inside the clutch facing,
A relatively simple structure in which an intermediate friction coefficient layer is provided between the low friction coefficient layer and a high friction coefficient layer outside thereof, and a sensor for detecting the wear amount of a clutch facing having a complicated structure as in a conventional example. Since it is not necessary to provide the above, it can be provided without increasing the cost.

(4) Even for an existing clutch, the present invention can be easily implemented by a simple structural change in which only the clutch facing of the clutch disc is changed.

(5) Since the medium friction coefficient layer is provided between the high friction coefficient layer and the low friction coefficient layer of the clutch facing, the driver or the like is gradually warned that the wear limit area of the clutch facing having the high friction coefficient has been reached, and eventually Ex-post measures can be prepared with sufficient time.

[Brief description of drawings]

1 and 2 are longitudinal explanatory views of the essential portions of the first and second embodiments of the clutch disc wear limit warning structure according to the present invention, and FIG. 3 is the clutch disc wear limit warning according to the present invention. FIG. 4 is a longitudinal sectional view of a main part of a third embodiment of the structure, and a distribution curve diagram of the friction coefficient thereof, and FIG. 4 is a subordinate explanatory view of the main part of a conventional clutch disk wear limit warning structure. (Description of symbols) 30, 40, 60 ... Clutch disc, 31, 41, 61 ... Center plate, 32, 33, 42, 43, 62, 63 ... Clutch facing, 32A, 33A, 42A, 43A, 62A , 63A ... High friction coefficient layer, 32B, 33B, 42B, 43B, 62B, 63B ... Intermediate friction coefficient layer, 32C, 33C, 42C, 43C, 62C, 63C ... Low friction coefficient layer, 32D, 33D, 42D , 43D, 62D, 63D ... wear limit surface.

Claims (2)

[Scope of utility model registration request] 1. A high friction coefficient layer 32A, 33A, 42A, 43A, 62A, 63A on one side or both sides of a center plate 31, 41, 61 or on the outside.
, Low friction coefficient layer 32C, 33C, 42C, 43C, 62C, 63C on the inside
Clutch facings 32, 33, 42, 43, 62, 63 with
While mounting, the outer high friction coefficient layer 32A, 33A,
42A, 43A, 62A, 63A and inner low friction coefficient layers 32C, 33C, 42
A wear limit warning structure for a clutch disc, characterized in that intermediate friction coefficient layers 32B, 33B, 42B, 43B, 62B, 63B of the high and low friction coefficient layers are provided between C, 43C, 62C and 63C. 2. The intermediate friction coefficient layers 32B, 33B, 42B, 43B,
The wear limit warning structure for a clutch disc according to claim 1, wherein the friction coefficients of 62B and 63B are gradually reduced from the outside toward the inside.