JP6584985B2 - Wet multi-plate clutch - Google Patents

Description

  The present invention generates frictional force by pressing an outer plate fixed to rotate integrally with the outer drum and an inner disk fixed to rotate integrally with the inner hub in the direction of the rotation axis. The present invention relates to a wet multi-plate clutch that rotates an inner hub and an inner hub integrally.

  Conventionally, an outer plate as an outer friction plate fixed so as to rotate integrally with the outer drum and an inner disk as an inner friction plate fixed so as to rotate integrally with the inner hub are pressed in the rotation axis direction. A wet multi-plate clutch that generates a frictional force and rotates an outer drum and an inner hub integrally is known (see, for example, Patent Document 1).

  In the wet multi-plate clutch of Patent Document 1, the drag resistance generated between the outer plate and the inner disk is reduced when the wet multi-plate clutch is released by supplying lubricating oil between the outer plate and the inner disk. ing.

JP-A-8-112498

  In the wet multi-plate clutch, it is desired that the outer friction plate and the inner friction plate are quickly separated when released. In the conventional wet multi-plate clutch, when the lubricating oil enters between the outer friction plate and the inner friction plate, the outer friction plate and the inner friction plate can be quickly separated.

  However, in the wet multi-plate clutch, it is desired that the outer friction plate and the inner friction plate be separated more rapidly.

  In view of the above points, an object of the present invention is to provide a wet multi-plate clutch capable of releasing a friction plate more quickly than in the past.

[1] In order to achieve the above object, the present invention provides:
A cylindrical outer base (for example, the outer drum 2 of the embodiment; the same applies hereinafter);
An inner base (for example, the inner hub 3 of the embodiment; the same applies hereinafter) having an outer peripheral surface opposed to the inner peripheral surface of the outer base and arranged to be relatively rotatable inside the outer base;
An outer friction plate (for example, the outer plate 4 of the embodiment; the same applies hereinafter) provided so as to rotate integrally with the inner peripheral surface of the outer base body and to be slidable in the rotation axis direction;
An inner friction plate (for example, the inner disk 5 of the embodiment; the same applies hereinafter) provided so as to rotate integrally with the outer peripheral surface of the inner base body and to be slidable in the rotation axis direction;
A piston (for example, the piston 6 of the embodiment, the same applies hereinafter) that presses the outer friction plate and the inner friction plate in the direction of the rotation axis to generate frictional force and synchronizes the rotation of the outer and inner substrates.
A wet multi-plate clutch (for example, wet multi-plate clutch 1 of the embodiment, the same applies hereinafter),
At least one of the outer base body and the inner base body has a sliding groove for guiding the sliding of the outer friction plate or the inner friction plate in the axial direction (for example, the sliding groove 3a of the embodiment, the same applies hereinafter). There are multiple spaces in the circumferential direction.
The outer friction plate or the inner friction plate that slides in the sliding groove includes a convex portion (for example, the protruding piece 5a of the embodiment; the same applies hereinafter) that fits into the sliding groove.
Lubricating oil is supplied to the sliding groove,
The outer friction plate or the inner friction plate having a convex portion is positioned on the upstream side of the flow path through which the lubricating oil flows in the sliding groove, so that the contact area with the lubricating oil flowing in the sliding groove is lower than the downstream side of the flow path. A contact area reducing portion configured to be reduced (for example, the first missing tooth 101a, the second missing tooth 102a, and the third missing tooth 103a of the embodiment, the same applies hereinafter) is provided.

  According to the present invention, since the friction plate having the contact area reducing portion is arranged on the upstream side of the flow path through which the lubricating oil flowing through the sliding groove flows, the upstream friction plate is hardly pushed by the lubricating oil. In contrast, the convex portion of the downstream friction plate is pressed by the lubricating oil, and the upstream and downstream friction plates can be quickly separated. Accordingly, when the wet multi-plate clutch is released, the outer friction plate and the inner friction plate can be quickly separated, and the wet multi-plate clutch can be released smoothly.

  [2] In the present invention, it is preferable that the contact area decreasing portion is configured so that the contact area gradually increases from the upstream side to the downstream side of the flow path of the lubricating oil flowing through the sliding groove. According to this structure, the space | interval of adjacent friction plates can be expanded comparatively equally by the flow of lubricating oil.

  [3] Also, in the present invention, the contact area decreasing portion is provided at the radially inner end of the inner friction plate, in which the sliding groove is provided on the outer peripheral surface of the inner base. Can do. According to such a configuration, when the lubricating oil is supplied from the rotation axis side, the sliding of the inner base body is compared with the sliding groove on the inner peripheral surface of the outer base body, which is obstructed by the outer friction board and the inner friction board. Lubricating oil is easily supplied to the groove, and the outer friction plate and the inner friction plate can be separated more quickly.

  [4] Also, in the present invention, in the case where the sliding groove is provided on the inner peripheral surface of the outer base body, the contact area reducing portion is provided at an end portion on the radially outer side of the outer friction plate. be able to.

FIG. 1A is an explanatory view showing a wet multi-plate clutch according to a first embodiment of the present invention. FIG. 1B is an explanatory view showing a first inner disk. FIG. 1C is an explanatory view showing a second inner disk. FIG. 1D is an explanatory view showing a third inner disk. FIG. 1E is an explanatory view showing a fourth inner disk. FIG. 2A is an explanatory diagram illustrating a fitting state between the first inner disk and the inner hub according to the first embodiment. FIG. 2B is an explanatory view showing a first inner disk of the first embodiment. Explanatory drawing which shows the 1st inner disk of the wet multi-plate clutch of 2nd Embodiment of this invention.

[First Embodiment]
With reference to FIG.1 and FIG.2, the wet multi-plate clutch 1 of 1st Embodiment of this invention is demonstrated. The wet multi-plate clutch 1 according to the first embodiment distributes, for example, power output from a transmission mounted on an automobile to one of left and right drive wheels.

  The wet multi-plate clutch 1 includes a plurality of cylindrical outer drums 2 that are rotatable, an inner hub 3 that is relatively rotatably disposed inside the outer drum 2, and an inner peripheral surface of the outer drum 2. Friction force between the outer plate 4 and the inner disk 5 by pressing the outer plate 4, the inner disks 5 arranged in plural so as to rotate integrally with the outer peripheral surface of the inner hub 3, and the outer plate 4. And a piston 6 that synchronizes the rotation of the outer drum 2 and the inner hub 3.

  The inner hub 3 is fixed to a drive shaft that transmits power to driving wheels of an automobile. On the outer peripheral surface of the inner hub 3, a plurality of sliding grooves 3a (32 in this embodiment as shown in FIG. 2) are provided at equal intervals in the circumferential direction.

  At the radially inner end of the inner disk 5, there is provided a projecting piece 5 a that fits in the sliding groove 3 a and guides the sliding of the inner disk 5 in the rotation axis direction.

  The outer drum 2 is disposed so as to rotate integrally with a ring gear that is rotated by a driving force output from a transmission mounted on an automobile. A plurality of sliding grooves 2 a extending in the rotation axis direction are provided on the inner peripheral surface of the outer drum 2 at equal intervals in the circumferential direction.

  On the radially outer end of the outer plate 4, there is provided a projecting piece 4 a that fits in the sliding groove 2 a and guides the sliding of the outer plate 4 in the rotation axis direction. An inner disk 5 is disposed between the outer plates 4.

  The arrow of FIG. 1 has shown the flow path through which the lubricating oil of the wet multi-plate clutch 1 of this embodiment flows. As is apparent from the arrow in FIG. 1, in this embodiment, the lubricating oil flows in the sliding groove 3a on the outer peripheral surface of the inner hub 3 from the left to the right in FIG.

  The inner disk 5 of the present embodiment is composed of four types. In order from the upstream side (left side in FIG. 1A) to the downstream side (right side in FIG. 1A) of the flow path in the sliding groove 3a, three first inner disks 101, three second inner disks 102, three first Three inner disks 103 and one fourth inner disk 104 are arranged.

  As shown in FIG. 1B, FIG. 2A and FIG. 2B, the first inner disk 101 includes four first missing teeth 101a with the protruding pieces 5a fitted to the sliding grooves 3a missing at equal intervals in the circumferential direction. Yes.

  As shown in FIG. 1C, the second inner disk 102 is positioned at a location corresponding to the first missing tooth 101a, and the second missing tooth 102a protruding radially inward from the first missing tooth 101a is disposed in the circumferential direction. Four are provided at equal intervals.

  As shown in FIG. 1D, the third inner disk 103 is located at a location corresponding to the first missing tooth 101a and the second missing tooth 102a, protrudes radially inward from the second missing tooth 102a, and is a fourth inner disk. Four third missing teeth 103a having an inner end (tip) positioned radially outward from the protruding piece 5a of the disk 104 are provided at equal intervals in the circumferential direction.

  According to the wet multi-plate clutch 1 of the first embodiment, the first chipped teeth 101a, the second chipped teeth 102a, the first chipped teeth 101a are arranged on the upstream side (left side in FIG. 1A) of the flow path through which the lubricating oil flowing through the sliding grooves 3a flows. A first inner disk 101, a second inner disk 102, and a third inner disk 103 each having three chipped teeth 103a are arranged.

  For this reason, the first inner disk 101 on the upstream side is difficult to be pushed by the lubricating oil, whereas the fourth inner disk 104 on the downstream side is pressed against the protruding piece 5a by the lubricating oil, so The inner disk 101, the second inner disk 102, the third inner disk 103, and the fourth inner disk 104 can be quickly separated from each other. As a result, when the wet multi-plate clutch 1 is released and the power transmission between the ring gear and the drive shaft is cut off, the outer plate 4 and the inner disk 5 can be quickly separated. It can be released smoothly.

  In the present embodiment, the missing teeth 101a to 103a are configured to be gradually larger so that the contact area with the lubricant gradually increases toward the downstream side (right side in FIG. 1A). By comprising in this way, the space | interval of adjacent inner discs 5 can be expanded comparatively equally with the lubricating oil which flows through the sliding groove | channel 3a, and the wet multi-plate clutch 1 can be released smoothly. .

[Second Embodiment]
With reference to FIG. 3, the wet multi-plate clutch 1 of 2nd Embodiment of this invention is demonstrated. In the wet multi-plate clutch 1 according to the first embodiment, the contact area with the lubricating oil is adjusted by gradually increasing the size of the missing teeth toward the downstream side. In the wet multi-plate clutch 1 of the second embodiment, the contact area with the lubricating oil is adjusted by gradually decreasing the number of missing teeth toward the downstream.

  The first inner disk 101 shown in FIG. 3 has four first missing teeth 101b lacking the protruding pieces 5a indicated by dotted lines, four second missing teeth 102b lacking the protruding pieces 5a indicated by alternate long and short dashed lines, and two points A total of sixteen missing teeth 101b to 103b including eight third missing teeth 103b lacking the protruding pieces 5a indicated by chain lines are provided.

  The second inner disk 102 of the second embodiment includes projecting pieces 5a indicated by dotted lines corresponding to the four first missing teeth 101b, second missing teeth 102b, and third missing teeth 103b.

  The third inner disk 103 includes protrusions 5a indicated by dotted lines corresponding to the four first missing teeth 101b, protrusions 5a indicated by alternate long and short dashed lines corresponding to the four second missing teeth 102b, And missing teeth 103b.

  The fourth inner disk 104 includes all the protruding pieces 5a as in the first embodiment.

  According to the wet multi-plate clutch 1 of the second embodiment, the first missing tooth 101b, the second missing tooth 102b, and the third missing tooth 103b are respectively provided upstream of the flow path through which the lubricating oil flowing through the sliding groove 3a flows. A first inner disk 101, a second inner disk 102, and a third inner disk 103 are provided.

  For this reason, the first inner disk 101 on the upstream side is difficult to be pushed by the lubricating oil, whereas the fourth inner disk 104 on the downstream side is pressed against the protruding piece 5a by the lubricating oil, so The inner disk 101, the second inner disk 102, the third inner disk 103, and the fourth inner disk 104 can be quickly separated from each other. As a result, when the wet multi-plate clutch 1 is released and the power transmission between the ring gear and the drive shaft is cut off, the outer plate 4 and the inner disk 5 can be quickly separated. It can be released smoothly.

  Further, in the present embodiment, the missing teeth 101a to 103a are configured to gradually decrease in number so that the contact area with the lubricating oil gradually increases toward the downstream side (right side in FIG. 1A). . By comprising in this way, the space | interval of adjacent inner discs 5 can be expanded comparatively equally with the lubricating oil which flows through the sliding groove | channel 3a, and the wet multi-plate clutch 1 can be released smoothly. .

[Other Embodiments]
In the first embodiment and the second embodiment, the inner disk has a missing tooth. However, the wet multi-plate clutch of the present invention is not limited to this. For example, the outer plate may be missing teeth, or both the inner disk and the outer plate may be missing teeth.

  In both the embodiments, the outer drum 2 and the inner hub 3 are both rotatable. However, the outer base body and the inner base body of the present invention are not limited to this, for example, the outer drum 2 and the inner hub 3. Either one of the hub 3 may be fixed to the housing.

  Moreover, in both embodiments, the configuration in which the contact area with the lubricating oil gradually increases from the upstream to the downstream of the flow path of the lubricating oil has been described. However, the wet multi-plate clutch of the present invention is not limited to this. For example, even if the contact area with the lubricating oil is increased only at one location from upstream to downstream, the quick clutch of the present invention The effect of being able to release can be exhibited.

DESCRIPTION OF SYMBOLS 1 Wet multi-plate clutch 2 Outer drum 2a Sliding groove 3 Inner hub 3a Sliding groove 4 Outer plate 4a Projection piece 5 Inner disk 5a Projection piece 6 Piston 101 First inner disk 101a First missing tooth 101b First missing tooth 102 First 2 Inner disk 102a Second missing tooth 101b Second missing tooth 103 Third inner disk 103a Third missing tooth 103b Third missing tooth 104 Fourth inner disk

Claims (4)

A cylindrical outer substrate;
An inner base body having an outer peripheral surface facing the inner peripheral surface of the outer base body and disposed so as to be relatively rotatable inside the outer base body;
An outer friction plate that rotates integrally with the inner peripheral surface of the outer base body and is slidable in the rotation axis direction;
An inner friction plate provided to rotate integrally with the outer peripheral surface of the inner base body and to be slidable in the rotation axis direction;
A piston that presses the outer friction plate and the inner friction plate in the rotational axis direction to generate a frictional force, and synchronizes the rotation of the outer base body and the inner base body;
A wet multi-plate clutch comprising:
At least one of the outer base body and the inner base body is provided with a plurality of sliding grooves for guiding the sliding of the outer friction plate or the inner friction plate in the axial direction at intervals in the circumferential direction.
The outer friction plate or the inner friction plate that slides in the sliding groove has a convex portion that fits into the sliding groove,
Lubricating oil is supplied to the sliding groove,
The outer friction plate or the inner friction plate having a convex portion is positioned on the upstream side of the flow path through which the lubricating oil flows in the sliding groove, so that the contact area with the lubricating oil flowing in the sliding groove is lower than the downstream side of the flow path. A wet multi-plate clutch characterized in that a contact area reducing portion configured to be reduced is provided. The wet multi-plate clutch according to claim 1,
The wet multi-plate clutch, wherein the contact area decreasing portion is configured so that the contact area gradually increases from upstream to downstream of the flow path of the lubricating oil flowing through the sliding groove. The wet multi-plate clutch according to claim 1 or 2,
The sliding groove is provided on the outer peripheral surface of the inner base body,
The wet area multi-plate clutch, wherein the contact area decreasing portion is provided at an end portion on the radially inner side of the inner friction plate. The wet multi-plate clutch according to any one of claims 1 to 3,
The sliding groove is provided on the inner peripheral surface of the outer base body,
The wet multi-plate clutch, wherein the contact area decreasing portion is provided at an end portion on the radially outer side of the outer friction plate.