JP2004197777A - Wet multiple disc clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance lubrication efficiency of sliding faces of each friction slide-contact members, by catching lubricating oil splashing along an outer wall face of a clutch hub to guide the lubricating oil in the clutch hub. <P>SOLUTION: Inner circumferential side rising parts 25 and outer circumferential side rising parts 26 are formed at predetermined intervals on two circles with centers as an axial center of the outer wall face 12d of the clutch hub 12, so that the rising parts 26, 25 are risen with a state where sections 26a, 25a of the rising parts direct an axial center direction. Each outer circumferential side rising part 26 faces between neighboring inner circumferential side rising parts 25 and both ends of the section 26a are overlapped with the sections 25a of neighboring inner circumferential side rising parts 25. Therefore, the lubricating oil splashed along an outside face 12d by centrifugal force is caught by the sections 25a of the inner circumferential side rising parts 25, and the lubricating oil passing through the neighboring inner circumferential side rising parts 25 and splashing is caught by the sections 26a of the outer circumferential side rising parts 26 to be guided in the clutch hub 12. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wet type multi-plate clutch that can efficiently supply lubricating oil to sliding surfaces of friction sliding members using centrifugal force.
[0002]
[Prior art]
Conventionally, in an automatic transmission using a planetary gear unit, a plurality of clutch plates or a wet friction engagement plate such as a brake plate is provided for each rotating element in order to change a power transmission path in the planetary gear unit during gear shifting. By controlling the engagement / disengagement state of the friction engagement element according to the driving state of the vehicle, a gear position corresponding to the driving state of the vehicle is automatically selected. It should be noted that when switching the gear position of the automatic transmission, a wet multi-plate brake that connects the rotating element and the transmission case and stops the rotation of the rotating element, and a wet multi-plate brake that connects the rotating element to another rotating element. Although there is a disc clutch, the functions thereof are the same except that they are only used for different purposes. Therefore, in the present invention, a wet multi-disc brake will be described as a concept including the wet multi-disc clutch.
[0003]
As a lubrication method for this type of wet multi-plate clutch, for example, in Japanese Patent Application Laid-Open No. 2000-145820, lubrication is supplied to a lubricating oil supply passage formed in a shaft of a support shaft that supports the wet multi-plate clutch. Lubricating oil is discharged from an oil passage port formed in the shaft periphery of the support shaft, and the discharged lubricating oil is scattered toward the inner peripheral surface of the clutch hub by centrifugal force, and is formed in the clutch hub. There is disclosed a technique of supplying oil to the sliding surfaces of a plurality of wet clutch plates disposed between the clutch hub and the clutch drum from the oil passage holes to lubricate and cool each wet clutch plate. ing.
[0004]
By the way, since the clutch hub is formed in a substantially cylindrical shape, the lubricating oil discharged on the outer wall surface side of the clutch hub is scattered outside the clutch hub. The lubricating oil cannot be used to lubricate and cool the sliding surface of the clutch plate.
[0005]
Therefore, for example, in Japanese Patent Application Laid-Open No. 2000-35056, an oil passage window is formed in the side wall surface of the clutch hub, and the lubricating oil supplied to the outer wall surface of the clutch hub is taken into the clutch hub through the oil passage window. Such a technique has been proposed.
[0006]
[Patent Document 1]
JP 2000-145820 A
[Patent Document 2]
JP 2000-35056 A
[Problems to be solved by the invention]
However, in the technique disclosed in Japanese Patent Application Laid-Open No. 2000-35056, since the oil passage window is simply opened on the side wall surface of the clutch hub, the oil scatters radially along the outer wall surface due to centrifugal force. The lubricating oil to be lubricated cannot be efficiently captured and guided into the clutch hub, which is insufficient for further increasing the lubrication efficiency.
[0009]
In view of the above circumstances, the present invention guides lubricating oil scattered by centrifugal force along the outer wall surface of a clutch hub into a clutch hub, and efficiently lubricates a sliding surface between clutch plates using the lubricating oil. Accordingly, an object of the present invention is to provide a wet multi-plate clutch capable of improving lubrication efficiency and performing efficient lubrication and cooling.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a frictional sliding member having an inner periphery supported by the clutch hub and an outer periphery supported by the clutch drum between a clutch hub and a clutch drum arranged coaxially. The other friction sliding members are alternately arranged, and an oil passage port is formed in the outer peripheral surface of the clutch hub that supports the one friction sliding member. In a wet multi-plate clutch for supplying lubricating oil from the axial direction to the moving surface through the oil passage port, a plurality of cut-and-raised portions are formed along a circumference centered on the axial center of the side wall surface of the clutch hub. Are formed at predetermined intervals, and the cut-and-raised portion is cut and raised in a direction opposite to the direction in which the outer peripheral surface extends, and is opened toward the axial center.
[0011]
In such a configuration, the lubricating oil diffused in the radial direction from the shaft center side by the centrifugal force along the outer surface of the side wall surface of the clutch hub is captured by the cut-and-raised portion opened in the side wall surface. To the inner peripheral surface side of the clutch hub, and through an oil passage port formed in the outer peripheral surface of the clutch hub to a friction sliding contact portion such as a sliding surface between the friction sliding member and the friction sliding member. This lubricates and cools these friction sliding contact portions.
[0012]
In this case, preferably, a plurality of the cut-and-raised portions are formed at predetermined intervals along a plurality of circumferences centered on the axis, and the cut-and-raised portions formed on the mutually adjacent circles are preferably formed. By making both ends of the cut end overlap each other when viewed from the axial direction, the lubricating oil diffused from the inner peripheral side to the outer peripheral side can be efficiently captured. In this case, a plurality of the cut-and-raised portions may be formed at predetermined intervals along two circumferences centered on the axis.
[0013]
Further, when the clutch hub is made of sheet metal, the cut-and-raised portions can be integrally formed when forming the clutch hub.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a main part of a wet multi-plate clutch applied to an automatic transmission.
[0015]
As shown in FIG. 1, a second support shaft (output member) 2 is coaxially and relatively rotatably disposed with respect to a first support shaft (input member) 1. A lubricating oil supply passage 4 is formed in the shaft cores of the support shafts 1 and 2, and an oil passage port 5 communicating with the lubricating oil supply passage 4 is formed in the circumference of the second support shaft 2. ing. Lubricating oil discharged from an oil pump (not shown) is supplied to the lubricating oil supply passage 4, and the lubricating oil is discharged in the axial direction through an oil passage port 5.
[0016]
A wet multi-plate clutch 11 has a clutch hub 12 and a clutch drum 13 of the wet multi-plate clutch 11 arranged coaxially.
[0017]
The clutch hub 12 is formed in a substantially cylindrical shape, and a boss portion 12a formed to project outward is spline-engaged with the second support shaft 2. Further, the clutch drum 13 is also formed in a substantially cylindrical shape, and a boss 13 a formed inwardly is integrally fixed to the first support shaft 1, and is fixed to the fixing member 3 via the bearing 6. It is rotatably supported. Further, a spline portion 13b formed on the inner periphery of the clutch drum 13 is opposed to the spline portion 12b formed on the outer periphery of the clutch hub 12 at a predetermined interval in a radial direction.
[0018]
A frictional sliding contact member is disposed between the two spline portions 12b and 13b. The friction sliding member has a plurality of inner clutch plates 14 whose inner circumferences are engaged with the spline portion 12b on the clutch hub 12 side, and is interposed between the respective inner clutch plates 14 and its outer circumference is a clutch. An outer clutch plate 15 that engages with the spline portion 13b on the drum 13 side and an outer wall surface of an inner clutch plate 14 that is disposed on the open end side of the clutch drum 13, and the outer periphery thereof is on the clutch drum 13 side And a retaining plate 16 that engages with the spline portion 13b of the clutch drum 13 and an outer wall surface of an inner clutch plate 14 that is disposed inside the clutch drum 13. Is a generic term for the pressure plate 18 that engages with the pressure plate 18.
[0019]
The back surface of the retaining plate 16 is prevented by a snap ring 17 a hooked on the first clutch piston 19, and the pressing load applied to each of the clutch plates 14 and 15 via the pressure plate 18 is reduced. It is supported by the retaining plate 16.
[0020]
The clutch drum 13 has a first clutch piston 19 which penetrates a clutch plate 15, a retaining plate 16, and a pressure plate 18 provided in engagement with the spline portion 13b to operate another wet clutch (not shown). And a second clutch piston 20 arranged concentrically inside the first clutch piston 19 and operating the wet multi-plate clutch 11 so as to be able to advance and retreat in the axial direction.
[0021]
A hydraulic chamber 21 for operating the first clutch piston 19 is formed between the first clutch piston 19 and the clutch drum 13, and further, the first clutch piston 19 and the second clutch piston A hydraulic chamber 22 for operating the second clutch piston 20 is formed between the hydraulic chamber 22 and the hydraulic chamber 22.
[0022]
On the other hand, a piston retainer 23 is disposed on the side of the second clutch piston 20 opposite to the hydraulic chamber. This piston retainer 23 is formed in a substantially cylindrical shape, and its axial center side is prevented from falling off via a snap ring 17 b on a boss portion 13 a of the clutch drum 13, while its outer peripheral side is formed on the inner periphery of the second clutch piston 20. Sliding contact. Further, a return spring 24 that constantly urges the second clutch piston 20 in the clutch releasing direction is interposed between the piston retainer 23 and the second clutch piston 20.
[0023]
When hydraulic pressure is supplied to the hydraulic chamber 22, the clutch piston 20 moves rightward in FIG. 1 against the urging force of the return spring 24, and the clutch plates 14 and 15 move to the pressure plate 18 and the retaining plate 16 respectively. And the clutch is connected. When the hydraulic pressure supplied to the hydraulic chamber 22 is drained, the clutch piston 20 is returned by the urging force of the return spring 24, and the clutch is released.
[0024]
In addition, a predetermined number of oil passage ports 12c are provided on the valley side of the spline portion 12b formed in the clutch hub 12 which engages the inner clutch plate 14 with the spline (in the present embodiment, two locations are provided for one valley portion). Has been drilled. On the other hand, a predetermined number of oil passage ports 13c are also provided on the valley side of the spline portion 13b formed on the clutch drum 13 that engages the outer clutch plate 15 with the spline (in this embodiment, two oil passage ports 13 are provided for one valley portion). ) Is drilled.
[0025]
The clutch hub 12 is made of sheet metal formed by drawing a flat plate with a press die. A plurality of inner circumferential side cuts are formed on two side surfaces 12 d of the clutch hub 12 along the center of the axis. A raised portion 25 and an outer circumferential cut-and-raised portion 26 are formed. Each of the cut-and-raised portions 25 and 26 is formed by cutting and raising into the shape of an armored door using a mold, and the cut-outs 25a and 26a are cut and raised outward with the cutouts 25a and 26a directed in the axial direction.
[0026]
In addition, the inner peripheral side raised portion 25 is formed at equal intervals at predetermined angles (90 ° in the present embodiment) about the axis, and the outer peripheral side raised portion 26 similarly has the axial center. The center is formed at regular intervals every predetermined angle (90 ° in this embodiment). Further, the outer peripheral side raised portion 26 is formed at a position facing the inner peripheral side raised portion 25 when viewed from the axis, and both ends of both cuts 25a and 26a overlap each other. Have been.
[0027]
Next, the operation of the wet multi-plate clutch having such a configuration will be described. When the engine is operated and the first support shaft 1 rotates, the clutch drum 13 of the wet multi-plate clutch 11 formed integrally with the first support shaft 1 rotates integrally with the first support shaft 1.
[0028]
On the other hand, when the oil pump is driven by the operation of the engine, the lubricating oil discharged from the oil pump is supplied to the lubricating oil supply passage 4 formed in the first and second support shafts 1 and 2. The lubricating oil supplied to the lubricating oil supply passage 4 is discharged in a circumferential direction from an oil passage port 5 formed in the circumference of the second support shaft 2.
[0029]
Then, a part of the lubricating oil discharged from the oil passage port 5 is diffused radially by centrifugal force along the side wall surface 12 d of the clutch hub 12. The diffused lubricating oil is captured by a cut 25a that is opened in a state of being directed in the axial direction of the inner circumferential cut-and-raised portion 25 formed on the side wall surface 12d, and passes through the cut 25a. , Is guided to the inner side of the clutch hub 12.
[0030]
Further, the lubricating oil that could not be caught by the inner circumferential cut-and-raised portion 25 is opened in a state of being directed in the axial direction of the outer circumferential cut-and-raised portion 26 formed in the outer circumferential direction. At the cut end 26a. As shown in FIG. 2, the outer cut-and-raised portion 26 faces between the inner cut-and-raised portions 25 when viewed from the axis, and is formed in the inner cut-and-raised portion 25. Since both ends of the cut edge 25a overlap with both ends of the cut edge 26a opened to the inner peripheral cut-and-raised portion 26, they pass through the space between the inner peripheral cut-and-raised portions 26 and diffuse in the radial direction. The lubricating oil is caught by the cut 26a opened in the outer cut-and-raised portion 26, and is guided to the inner surface side of the clutch hub 12 through the cut 26a.
[0031]
Then, the lubricating oil guided to the inner surface side of the clutch hub 12 reaches a spline portion 12b formed on the outer periphery of the clutch hub 12 by centrifugal force, and passes through an oil passage port 12c formed in the spline portion 12b to form a spline. The fluid is discharged to the outer peripheral surface of the portion 12b, and the sliding surfaces of the clutch plates 14, 15 and the sliding surfaces of the inner clutch plate 14, the retaining plate 16, and the pressure plate 18, ie, the frictional sliding contact portions After being supplied to the sliding surface and lubricating and cooling these friction sliding portions, the fluid is discharged in a circumferential direction from an oil passage port 13c formed in a spline portion 13b formed on the outer periphery of the clutch drum 13. You.
[0032]
As described above, in the present embodiment, the cut-and-raised portions 25 and 26 are formed on the side wall surface 12d of the clutch hub 12 so as to be cut and raised outward with the cuts 25a and 26a oriented in the axial direction. The lubricating oil diffused by the centrifugal force from the axial direction can be captured by the openings 25a and 26a and efficiently guided toward the inner surface of the clutch hub 12.
[0033]
In addition, the outer cut-and-raised portion 26 is located between the inner cut-and-raised portions 25 when viewed from the axis, and both ends of the cut 25a formed in the inner cut-and-raised portion 25 are Since the both ends of the cut 26a opened to the inner peripheral cut-and-raised portion 26 overlap, the lubrication that could not be completely captured by the cut 26a of the inner peripheral cut-and-raised portion 26 is reduced to the outer cut. The lubricating oil can be efficiently guided into the clutch hub 12 because the lubricating oil can be caught by the cut 26a of the portion 26, and the sliding surfaces of the clutch plates 14, 15 can be efficiently moved with a relatively small amount of lubricating oil. Can be lubricated and cooled. As a result, the burden on the oil pump can be reduced, the size of the oil pump can be relatively reduced, and the fuel consumption can be reduced by reducing the capacity of the oil pump.
[0034]
Further, since the cut-and-raised portions 25 and 26 can be integrally formed when the sheet metal clutch hub 12 is formed, the productivity can be improved and the cost can be reduced.
[0035]
Note that the present invention is not limited to the above-described embodiment. For example, the cut-and-raised portions formed on the side wall surface 12d of the clutch hub 12 are arranged in three or more rows in the radial direction around the shaft center and each circle. The cut-and-raised portions formed on the circumference are arranged in a zigzag pattern with respect to the cut-and-raised portions formed on the other adjacent circles, and both ends overlap each other when viewed from the axis. It may be formed.
[0036]
【The invention's effect】
As described above, according to the present invention, the lubricating oil scattered radially from the shaft center side by the centrifugal force along the outer wall surface of the clutch hub is captured by the cut and raised portion formed on the outer wall surface. Then, the lubricating oil can be efficiently supplied to the sliding surface of each frictional sliding contact member, and the frictional sliding contact portion can be efficiently lubricated and cooled.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a wet multi-plate clutch equivalent to the II section in FIG. 2; FIG. 2 is a side view of a clutch hub; FIG. 3 is a III-III sectional view in FIG. 2; FIG. Cross-sectional view [Explanation of reference numerals]
Reference Signs List 11 Wet multi-plate clutch 12 Clutch hub 12c Oil passage port 12d Side wall surface 13 Clutch drum 14 Inner clutch plate (friction sliding contact member)
15 Outer clutch plate (friction sliding contact member)
16 Retaining plate (friction sliding member)
18 Pressure plate (friction sliding member)
25, 26 Cut and raised part 25a, 26a Cut end

Claims (4)

Between the clutch hub and the clutch drum disposed coaxially, one friction sliding contact member that supports the inner periphery of the clutch hub and the other friction sliding contact member that supports the outer periphery of the clutch drum alternately. Arranged in
An oil passage port is formed in an outer peripheral surface of the clutch hub that supports the one frictional sliding member,
In a wet multi-plate clutch for supplying lubricating oil from the axial center direction to the sliding surface of each of the frictional sliding members through the oil passage port,
A plurality of cut-and-raised portions are formed at predetermined intervals along a circumference centered on the axis of the side wall surface of the clutch hub, and the cut-and-raised portions are cut with the extending direction of the outer peripheral surface. A wet multi-plate clutch characterized by being cut and raised in the opposite direction and opened toward the axial center. A plurality of the cut-and-raised portions are formed at predetermined intervals along a plurality of circumferences around the axis,
2. The wet multi-plate clutch according to claim 1, wherein both ends of the cut-and-raised portion formed on the circumference adjacent to each other overlap each other when viewed from the axial direction. The wet multi-plate clutch according to claim 2, wherein a plurality of the cut-and-raised portions are formed at predetermined intervals along two circumferences centered on the axis. The wet multi-plate clutch according to any one of claims 1 to 3, wherein the clutch hub is made of sheet metal, and the cut-and-raised portions are formed integrally when forming the clutch hub.

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