JPH04194422A - Wet clutch - Google Patents

Abstract

PURPOSE:To reduce a lubricating oil amount intruding between first and second plates and drag torque by forming a groove from the inner peripheral edge to the outer peripheral edge on a facing material fixed to the first plate and providing an oil reservoir communicating to the groove in the inner peripheral edge. CONSTITUTION:A first plate 12 has facing materials 20 fixed to both sides thereof to increase a frictional force. When the first plate 12 is pressed against a second plate 14, a clutch 10 is turned on. The facing material 20 is formed with a groove 30a extending from the inner peripheral edge side to the outer peripheral edge side. The inner peripheral edge of the facing material 20 is tapered. When the clutch 10 is not turned on, lubricating oil (e) directed toward the outer periphery by a centrifugal force is once reserved in an oil reservoir 20a formed of the tapered part and the surface of the plate 12. Then, the oil is discharged from the groove 30a to the outer periphery, so that an amount of the lubricating oil (e) intruding between both plates 12, 14 is reduced. As a result, drag torque generated between both plates 12, 14 is reduced to reduce power loss.

Description

[Detailed description of the invention] (Industrial application field) The present invention is directed to a wet clutch.

(Prior art) As a conventional wet clutch, for example, the
There is something disclosed in 8832@publication.

As shown in Figures 14 to 16FgJ, this is the first
Plate 12. and second plates 14b are alternately arranged in multiple stages and overlapped with each other to form the wet clutch 10. 14 is a cross-sectional view of a main part of the wet clutch 10, FIG. 15 is a cross-sectional view of the first plate 12 shown in FIG. 14, and FIG.
Plate 12 (7) Y-, Y cross section, (b) 4: tlt
ilL;<7-Zli surface is shown, and the relationship between the first plate 12, the second plate 14, and the oil is shown.

The first plate 12 is engaged with a spline 16a of the clutch hub 16 via a plurality of radial protrusions 12a formed on the inner circumference, and the second plate 14 is
It is engaged with the subline 18a of the drum 18 via a plurality of radial protrusions 14a formed on the outer periphery.

Therefore, the first plate 12 and the second plate 14
When the clutch hub 16 is pressed into contact with the clutch hub 16, the driving force for rotating the clutch hub 16 is transmitted to the drum 18. The first plate has a facing material 20 made of vapor friction material fixed to both sides, and when fastened, the facing material 20 comes into contact with the second plate 14, thereby increasing the WIWA force and ensuring reliable fastening. It can be performed.

In addition, in the wet clutch 10, when moving from a non-engaged state to an engaged state, the facing material 20 and the second plate 1
1IIIW1 oil is supplied in order to absorb the heat generated by the soaking friction that occurs between the two.

The supplied lubricating oil is discharged to the outer periphery by centrifugal force generated by the rotation of the first plate 12.

By the way, in such a conventional wet clutch, the distance between the surface of the facing material 20 provided on the first plate 12 and the second plate 14 is made small in order to perform quick engagement. Because of this, the clutch release letter! ! lk: Even if there is, the first plate 1 is held in a state where lubricating oil has entered between the facing material 20 and the second plate 14.
When the first plate 12 and the second plate 14 rotate relative to each other, drag torque (friction torque) that prevents the rotation of the first plate 12 is generated due to the viscosity of the lubricating oil.

Therefore, the groove 30 is provided on the facing material 20. l
By using this as a discharge path for the W4 oil, the I! ! l
The amount of W4 oil was reduced in an attempt to reduce drag torque.

(Problems to be Solved by the Invention) However, the face 30 provided on the facing material 20 is subject to restrictions on its shape and total iii product.

This is due to the static l! that acts on the first plate 12 and the second plate 14 when the wet clutch is engaged. ! This is because in order to obtain sufficient frictional force, it is necessary to ensure that the area of the facing material 20 is a predetermined amount or more.

Therefore, the lubricating oil is not sufficiently discharged through the grooves 30, and the facing material 2 provided on the first plate 12
The lI clean oil penetrated into the gap between the 0 and the second plate 14, and the drag torque reduction effect was not sufficient. That is the 16th! ! 1. As shown in (a), the lubricating oil that has reached the vicinity of the 130 on the inner peripheral edge side passes through the groove 30 and is discharged to the outer periphery. However, as shown in FIG. 16(b), the WJW4 oil that has reached the part away from the groove 30 on the inner peripheral edge side is difficult to be discharged by the groove 30, and the facing material 20 and the second plate 14 It infiltrates the temple.

As described above, there is a problem in that the drag torque reduction effect is not sufficient, leading to power loss and worsening fuel efficiency.

In view of the above, an object of the present invention is to
The facing material 20 provided on the first plate 12 has the effect of discharging the WJ lubricating oil by the 1130 provided on the
The objective is to obtain a sufficient drag torque reduction effect by reducing the amount of lubricating oil that infiltrates between the second plate 14 and the second sixth plate 14.

(Means for Solving the Problems) In order to achieve the above object, the invention described in item 1 of the scope of the Patent FF m-required is such that an annular facing material having a groove formed therein extending from an inner circumferential edge to an outer circumferential edge is fixed. a first plate that is pressed against the facing material, and a first brake plate that is pressed against the facing material;
- a second plate for transmitting driving force between the first plate and the second plate;
The wet clutch supplied with 11W4 oil is characterized in that an oil reservoir communicating with the groove is formed on the inner peripheral edge of the facing material.

Further, the invention as set forth in claim 2 provides the wet clutch according to the invention as set forth in claim 1, wherein the width dimension on the inner peripheral edge side of the groove formed in the facing material is the width on the outer peripheral edge side. It is characterized by being larger than the dimensions.

(Function) In the wet clutch according to the invention described in claim 1, the supplied lubricating oil is caused to flow toward the outer circumference by centrifugal force generated by rotation of the first plate or the second plate. The lubricating oil that has reached the inner peripheral edge of the facing material is collected in the oil reservoir, and the amount of lubricating oil that enters between the facing material and the second plate is reduced. The lubricating oil stored in the oil reservoir is discharged toward the outer circumference from a groove communicating with the oil reservoir. Therefore, when the first plate and the second plate are not fastened together, the amount of lubricating oil that enters between the facing material and the second plate is reduced.

Furthermore, in the wet clutch according to the invention described in claim 2, in addition to the above-mentioned effect, since the width dimension on the inner peripheral edge side of the groove is made larger than the width dimension on the outer peripheral edge side, rRW4 oil collected in the oil reservoir part is removed. is more easily discharged from the groove toward the outer circumference. Therefore, when the first plate and the second plate are not fastened together, the second plate may seep into the gap between the facing material and the second plate. lWR oil is further reduced.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

1 to 7 show a first embodiment of the present invention. 1st
The figure is a sectional view of a main part of a wet type multi-disc clutch 10 as a wet type clutch to which the present invention is applied, and FIG. 2 is a view of arrow A of the first plate 12 used in the wet type multi-disc clutch 10 shown in FIG. 3 shows the arrow B of the first plate 12 shown in FIG. 2, and FIG. 4 shows the view XX of the first plate 12 shown in FIG.
The cross section, FIG. 5 and FIG. 6 show the flow of condensed oil in the wet multi-disc clutch 10, and FIG.
FIG. 3 is a characteristic diagram showing the magnitude of drag torque with respect to the relative rotational speed with respect to the plate 14 of FIG.

As shown in FIG. 1, in the wet multi-disc clutch 10, the first
The plates 12 and the second plates 14 are alternately arranged in multiple stages and overlapped with each other.

The first plate 12 connects the spline 16 of the clutch hub 16 through a plurality of radial protrusions 12a formed on the inner circumference.
a, and the second blade 14 is connected to the drum 18 via a plurality of radial protrusions 14 formed on the outer periphery.
The spline 18a is engaged with the spline 18a.

Therefore, the first plate 12 and the second plate 14
When the clutch hub 16 is pressed into contact with the clutch hub 16, the driving force for rotating the clutch hub 16 is transmitted to the drum 18. The above-mentioned first plate 12 has facing members 20 made of paper friction material fixed to both sides, and when the facing members 20 come into contact with the second plate 14 at the time of fastening, the frictional force is increased and a reliable A conclusion can be made.

Further, as shown in FIG. 2, the facing material 20 fixed to the first plate 12 has a groove 30a extending from the inner circumferential edge side to the outer circumferential edge side, the width dimension a of the inner circumferential edge side being larger than the width dimension of the outer circumferential edge side. It is formed. Note that the first
As shown in FIG. 3, which is the arrow B of the first plate 12, there is no facing material at the bottom of the first plate 12, and the surface of the first plate 12 is exposed.

Further, as shown in FIG. 4, which is a cross section taken along line X-X of the first plate 12 shown in FIG. The lubricating oil e is stored in an oil reservoir 20a formed by the tapered inner peripheral edge and the surface of the first plate 12.

With the above configuration, in the wet multi-disc clutch 10 of this embodiment, the flow of lubricating oil in the non-engaged state is as shown in FIGS. 5 and 6. In other words, the lubricating oil e supplied from the inner circumference to the outer circumference by centrifugal force is temporarily stored in the oil reservoir 20a, and is discharged to the outer circumference from a replica oil reservoir 30a communicating with the oil reservoir 20a. At this time, as shown in Figure 2, <
Since the width a on the inner circumferential edge side of the groove 30a, which serves as a discharge path for the S lubricating oil, is larger than the width on the outer circumferential edge side, the lubricating oil stored in the oil reservoir 20a more easily penetrates into the groove 130a. , is discharged to the outer periphery. Therefore, the amount of 1ilW4 oil that enters between both plates can be reduced.

FIG. 7 is a characteristic diagram showing the magnitude of drag torque with respect to the relative rotational speed between the first plate 12 and the second plate 14, and the solid line in the figure shows the drag torque when using a conventional wet clutch. Characteristic A is shown, and the broken line represents drag characteristic B when the wet clutch of this embodiment is used. As this figure shows, the first plate 12 and the second plate 14
When the relative rotational speed is low, the lubricating oil that has penetrated into the gap between the facing material 20 provided on the first plate 12 and the second plate 14 due to the viscosity of the oil will cause the
The drag torque increases in proportion to the relative rotational speed. When the relative rotational speed increases, the fixing material 2
Due to the effect of the groove provided in the groove, the lubricating oil that has entered between the two is separated from them, and the drag torque is reduced. However, as is clear from this characteristic diagram, in the case of this example, the lubricating oil is The relative rotational speed when peeling off from both is low, and the drag torque can be reduced compared to the conventional method.

Note that the number 30 & provided on the facing material 20 is the 8th
As shown in the figure, the facing material may be left at the bottom, and the shape of the inner peripheral edge of the facing material 20 may be
The ones shown in FIGS. 9(a), (b), and (c) may also be used,
In short, any shape may be used as long as it forms an oil reservoir for storing oil.

FIG. 10 to FIG. 13 show a second embodiment of the present invention, and as shown in FIG. and the width dimension on the outer peripheral edge side are the same, and the other configurations are the same as in the first embodiment.

With the above configuration, the wet multi-disc clutch 10 of this embodiment has the following features:
The flow of lubricating oil in the unfastened state is shown in Figures 12 and 13.
It works as shown in the figure. Figure 13 shows arrow A in Figure 12.
It is. That is, the lubricating oil e supplied from the inner circumference to the outer circumference by centrifugal force is collected in the oil reservoir 20a, and then discharged to the outer circumference from the groove 30b communicating with the oil reservoir 20a. Although the discharge effect is reduced compared to the first embodiment, the amount of lubricant that enters between the facing material 20 and the second plate 14 is significantly reduced compared to the conventional example.
Therefore, drag torque is reduced. Also in this second embodiment, the facing material 20 may have the shape shown in FIGS. 8 and 9.

In addition, in the first and second embodiments described above, a multi-plate clutch is used as a wet type clutch in which the first plate has radial protrusions on the inner circumferential edge side, and the second plate has radial protrusions on the outer circumferential edge side. Although the explanation is not limited to this, for example, there may be a clutch in which the side on which the radial protrusion is provided is completely opposite to the above embodiment with the first and second plates, or a single plate clutch in which there is only one first plate. It goes without saying that the present invention can also be applied to.

(Effects of the Invention) As explained above, in the wet clutch according to the invention set forth in claim 1, since the oil reservoir portion communicating with the groove is formed on the inner peripheral edge of the facing material, Il to infiltrate the rice with the plate of 2? ! The amount of oil can be reduced, and as a result, the drag torque generated in the plate can be reduced, power loss can be reduced, and fuel efficiency can be improved.

Further, in the wet clutch according to the invention as set forth in claim 2, the width dimension on the inner peripheral edge side of the groove formed in the facing material is larger than the width dimension on the outer peripheral edge side. By using the wet clutch as described in Section 1, it is possible to further reduce the amount of lO lubricant that enters the area between the facing material and the second plate, and as a result - the drag torque generated in the plate can be significantly reduced, reducing power loss. can be reduced and fuel efficiency improved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of main parts showing the first embodiment of the present invention, and FIG.
The figure is a front view of the first plate 12 used in the first embodiment of the present invention (arrow direction A in FIG. 1), and FIG.
View from arrow B in the figure, Figure 4 is a sectional view taken along the line X-X in Figure 2, Figure 5 is a sectional view of main parts showing the flow of lubricating oil in the wet multi-disc clutch, and Figure 6 is shown in Figure 5. 1st plate 1
2, arrow view A, FIG. 7 is a drag torque characteristic diagram comparing the present invention and a conventional example, and FIG. 8 is a diagram used in another embodiment of the first plate shown in FIG. 3. FIG. 9 is an explanatory diagram showing what is used in another embodiment of the first plate shown in FIG. 4, 10th rj!
J is a front view of the first plate used in the wet clutch of the second embodiment of the present invention, and FIG.
-X sectional view, FIG.
FIG. 3 is a front view of the first plate in FIG.
12 is an arrow view A), FIG. 14 is a sectional view of a main part showing a conventional example, FIG. 15 is a front view of the first plate in FIG. 14 (arrow A in FIG. 14), and FIG. 16 is a FIG. 15 is a sectional view of a main part showing the flow of lubricating oil in the wet clutch in FIG. 14; 10... Wet type multi-plate clutch (wet type clutch) 12...
・First plate 14...Second plate 16...Clutch hub 18...Drum 20...Facing material 20 a-...Oil reservoir portion 30.30a, 30b...Groove Fig. 2 30a: Groove Figure 3 Figure 4 e: ;i'lKusurata Figure 7 Waga times dry bowl rpm Figure 9 (b) (C) Figure 10 Figure 11 Figure 12 Figure 13! R Figure 14 Figure 15 Figure 16 Y-Y female side (b) z-2 European side

Claims (2)

[Claims] (1) A first plate to which an annular facing material having a groove extending from an inner circumferential edge to an outer circumferential edge is fixed; In a wet clutch that includes a second plate that transmits driving force between the first plate and the second plate, and that supplies lubricating oil to the gap between the first plate and the second plate, the inner peripheral edge of the facing material is provided with: A wet clutch, characterized in that an oil reservoir portion communicating with the groove is formed. (2) The wet clutch according to claim 1, wherein the width of the groove formed in the facing material is larger on the inner circumferential edge side than on the outer circumferential edge side.