JP2019158020A - Clutch device - Google Patents

Abstract

To sufficiently secure an oil amount supplied to a lubrication space in a clutch device.SOLUTION: A clutch device 100 includes: a lubrication space 40 in which friction plates 11, 13 for connecting/disconnecting power are arranged; a supply passage 26 opening at a clutch guide 31 (outer peripheral part of a rotary shaft 20) and supplying an oil to the lubrication space 40; and an introduction port 35 opening at an inner periphery 14a of a piston 14 coming into slide contact with the clutch guide 31, extending in the radial direction of the rotary shaft 20, and changing an opening area of the supply passage 26 according to the piston 14 moving in the axial direction of the rotary shaft 20. Thereby, by a centrifugal force acting in the flow direction on the oil flowing in the introduction port 35, the oil amount supplied to the lubrication space 40 can be secured sufficiently.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a clutch device that interrupts power.

  Conventionally, a wet clutch device in which a friction plate pressed by a piston is lubricated by oil is known (see, for example, Patent Document 1). The device described in Patent Document 1 includes a lubrication space in which a friction plate is accommodated, an oil passage that opens to the outer periphery of a rotating shaft and supplies oil to the lubrication space, and a tapered surface that is provided in a piston and opens and closes the oil passage. And comprising. In this device, when the oil passage is opened by the tapered surface as the piston moves, the oil supplied from the oil passage flows radially inward along the tapered surface and then flows into the lubrication space.

Japanese Patent Laying-Open No. 2015-187465

  However, in the device described in Patent Document 1, the centrifugal force acting as the rotating shaft and the piston rotate acts in the opposite direction to the oil flow toward the radially inner side along the tapered surface. It is difficult to ensure a sufficient amount of oil supplied to

  One aspect of the present invention is a clutch device that interrupts power by moving a piston in the axial direction of a rotating shaft. The clutch device includes a lubrication space in which an element that interrupts power is disposed, and an outer peripheral portion of the rotating shaft. A supply path that supplies oil to the lubrication space and opens to the inner periphery of the piston that is in sliding contact with the outer periphery of the rotating shaft, extends in the radial direction of the rotating shaft, and the piston moves in the axial direction of the rotating shaft And an introduction port that changes the opening area of the supply path.

  According to the present invention, the amount of oil introduced into the lubrication space is adjusted by changing the opening area of the supply path by the introduction port as the piston moves in the axial direction. A centrifugal force acts on the oil flowing through the introduction port in the flow direction, so that a sufficient amount of oil is supplied to the lubrication space.

It is sectional drawing which shows the principal part structure of the clutch apparatus which concerns on embodiment of this invention, Comprising: The figure which shows the state at the time of non-fastening. It is sectional drawing which shows the principal part structure of the clutch apparatus which concerns on embodiment of this invention, Comprising: The figure which shows the state at the time of fastening. It is sectional drawing of the clutch apparatus which concerns on embodiment of this invention, Comprising: The figure which expanded a part of FIG. The perspective view which shows a part of piston which comprises the clutch apparatus which concerns on embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a cross-sectional view showing the main configuration of the clutch device 100 according to the present embodiment, and shows a state when not engaged. For simplification of explanation, a part of the clutch device 100 is omitted. The “radial direction” and the “axial direction” mean a radial direction centering on an axis O passing through the center of the clutch device 100 and a direction in which the axis O extends. The “axial direction” corresponds to, for example, a vehicle width direction of the vehicle or a length direction perpendicular to the vehicle width direction.

  Clutch device 100 is provided in a torque transmission path for transmitting the power of the engine mounted on the vehicle to the transmission as a torque transmission path for transmitting the power of the power source to the torque transmitted portion.

  The clutch device 100 interrupts power transmitted from the rotary shaft 20 (input shaft) driven by the engine to the clutch hub 12 (output shaft).

  The clutch hub 12 transmits power to the transmission via the gear 3. The clutch hub 12 is rotatably supported by the rotary shaft 20 and the case 21 via bearings 22 and 23.

  Annular clutch guides 31, 32, and 33 are fixedly provided on the rotary shaft 20. An annular piston 14 is slidably provided inside the clutch guides 31, 32, 33. A pressure chamber 17 is formed between the clutch guides 31 and 32 and the piston 14. An oil passage 25 that guides the hydraulic pressure to the pressure chamber 17 is formed in the rotary shaft 20. The clutch guide 31 constitutes the outer peripheral portion of the rotary shaft 20 that slidably supports the piston 14.

  The piston 14 includes a cylindrical tube portion 15 and a disk-shaped pressure receiving portion 16 that extends radially outward from the tube portion 15. The inner periphery 14 a of the cylindrical portion 15 is slidably supported by the clutch guide 31 via the seal ring 43. The outer periphery 16 a of the pressure receiving portion 16 is slidably supported by the clutch guide 32 via the seal ring 44.

  A coiled spring 18 is compressed and interposed between the piston 14 and a retainer 39 attached to the clutch guide 31. The spring 18 biases the piston 14 to the initial position as shown in FIG.

  Inside the clutch guide 32, a plurality of friction plates 11 and 13 are arranged alternately in the axial direction as elements for interrupting power. The outer periphery of the friction plate 11 (separator plate) is supported by a spline 37 of the clutch guide 32 so as to be slidable in the axial direction. The inner periphery of the friction plate 13 (friction disk) is supported by the spline 19 of the clutch hub 12 so as to be slidable in the axial direction.

  FIG. 1 shows a state when the clutch is not engaged. When the clutch is not engaged, the pressure oil is not supplied from the oil passage 25 to the pressure chamber 17, and the piston 14 is held at the initial position by the urging force of the spring 18. As a result, the friction plate 11 and the friction plate 13 are not separated from each other and transmit power.

  FIG. 2 is a diagram illustrating a state when the clutch is engaged. When the clutch is engaged, as shown by an arrow A in FIG. 2, pressure oil is supplied to the pressure chamber 17 from the oil passage 25, and the piston 14 moves to the right in FIG. Press. The friction plate 11 and the friction plate 13 transmit the power of the rotating shaft 20 to the clutch hub 12 by a frictional force generated between them.

  Hereinafter, the lubrication structure of the clutch device 100 will be described.

  A lubricating space 40 is formed around the rotary shaft 20 by the clutch guides 31, 32, 33, the piston 14, the clutch hub 12, and the like. The rotating shaft 20 and the clutch guide 31 are formed with a supply path 26 that guides oil supplied from a hydraulic pressure source (not shown). The supply path 26 communicates with the lubrication space 40 through an introduction port 35 that penetrates the piston 14. The supply path 26 is always communicated with the lubrication space 40 by a communication path 52 formed around the piston 14.

  The supply path 26 includes a shaft hole 27, a through hole 28 and an annular groove 29 formed in the rotary shaft 20, and a plurality of supply ports 36 formed in the clutch guide 31.

  The shaft hole 27 extends in the axial direction of the rotary shaft 20 and has one end communicating with a hydraulic pressure source (not shown). The through hole 28 is formed to extend in the radial direction across the other end of the shaft hole 27 and the annular groove 29. The annular groove 29 is annularly opened on the outer periphery of the rotating shaft 20.

  The supply port 36 is formed through the clutch guide 31 in the radial direction. One end of the supply port 36 opens toward the annular groove 29.

  FIG. 3 is an enlarged cross-sectional view of a part of FIG. The introduction port 35 is formed through the cylindrical portion 15 of the piston 14 in the radial direction. One end of the introduction port 35 opens to the outer periphery 15 b of the cylindrical portion 15 and faces the inner peripheral region of the lubrication space 40. The other end of the introduction port 35 opens to the inner periphery 14a of the cylindrical portion 15 of the piston 14, communicates with the supply port 36 of the supply channel 26 as the piston 14 moves in the axial direction, and the supply channel 26 lubricates. The flow path area opened to the space 40 is changed.

  FIG. 4 is a perspective view showing the cylindrical portion 15 of the piston 14. The introduction port 35 is formed in a slit shape by a flow path surface 35a extending in a planar shape in the radial direction and the circumferential direction. Two inlets 35 are formed in the cylindrical portion 15 side by side in the circumferential direction. However, the present invention is not limited to this, and the cylindrical portion 15 may have one or three or more introduction ports 35 formed therein.

  As shown in FIGS. 1 to 3, the communication path 52 includes a gap 53 formed between the rotary shaft 20 and the splines 41 and 42 of the clutch guide 31, and a gap 54 formed between the clutch guide 31 and the bearing 22. And composed of The communication path 52 is branched from the supply path 26 and provided in parallel with the introduction port 35.

  As shown in FIGS. 1 and 2, a plurality of discharge holes 34 are formed in the clutch guide 32. The discharge hole 34 opens at the groove bottom of the spline 37 and faces the outer peripheral region of the lubrication space 40.

  Next, the flow of oil in the clutch device 100 will be described.

  When the clutch is not engaged, as shown in FIG. 1, the piston 14 is in the initial position, the supply port 36 and the introduction port 35 of the supply path 26 are not communicated with each other, and the supply path 26 is closed by the cylindrical portion 15 of the piston 14. ing. On the other hand, the communication path 52 is always open, and the oil supplied through the communication path 52 is introduced into the lubrication space 40 as indicated by an arrow B. At this time, since the friction plate 11 and the friction plate 13 are rotating relative to each other, they are sufficiently lubricated by a small amount of oil supplied through the communication path 52. Oil having lubricated each part in the lubrication space 40 is discharged through the discharge hole 34.

  When the clutch is engaged, as shown in FIG. 2, as the piston 14 moves in the axial direction, the supply port 36 and the introduction port 35 of the supply channel 26 communicate with each other, and the supply channel 26 is opened. As a result, oil supplied from the supply path 26 is introduced into the lubrication space 40 through the introduction port 35 as indicated by an arrow C, and oil supplied subsequently through the communication path 52 is indicated as arrow B in the lubrication space. 40. At this time, the oil traveling toward the lubrication space 40 through the introduction port 35 flows toward the radially outer side of the rotating shaft 20, so that centrifugal force acts in the flow direction. Thus, the amount of oil supplied to the lubrication space 40 is increased by the centrifugal force, so that the sliding contact portions of the friction plates 11 and 13 are sufficiently lubricated and cooled. The oil that has lubricated the friction plates 11 and 13 in the lubrication space 40 is discharged through the discharge hole 34. As a result, excess oil does not accumulate in the lubricating space 40, and the oil agitation resistance is kept small.

  According to this embodiment, the following operational effects can be achieved.

  (1) The clutch device 100 interrupts power by moving the piston 14 in the axial direction of the rotary shaft 20. The clutch device 100 includes a lubrication space 40 in which the friction plates 11 and 13 are disposed as elements for interrupting power, and a supply path that opens to the clutch guide 31 (the outer peripheral portion of the rotary shaft 20) and supplies oil to the lubrication space 40. 26 and the clutch guide 31 (the outer peripheral portion of the rotating shaft 20) is opened in the inner periphery 14 a of the piston 14 and extends in the radial direction of the rotating shaft 20, and the piston 14 moves in the axial direction of the rotating shaft 20. The inlet 35 which changes the opening area of the supply path 26 is provided.

  As a result, the amount of oil introduced into the lubrication space 40 is adjusted without using a control valve or the like by the introduction port 35 changing the opening area of the supply path 26 as the piston 14 moves in the axial direction. Therefore, the clutch device 100 can be prevented from being complicated in structure. Then, centrifugal force acts on the oil flowing through the inlet 35 in the flow direction, so that a sufficient amount of oil is supplied to the lubrication space 40, and the friction plates 11, 13 and the like are lubricated satisfactorily.

  (2) The piston 14 has a cylindrical cylindrical portion 15 that is slidably supported by the clutch guide 31 (the outer peripheral portion of the rotating shaft 20). The introduction port 35 is formed so as to penetrate the cylindrical portion 15 from the inner periphery 14a of the cylindrical portion 15 to the outer periphery 15b.

  As a result, the introduction port 35 is disposed in a limited space in the clutch device 100, and the introduction port 35 avoids an increase in the dimension of the cylindrical portion 15 in the radial direction. Therefore, the clutch device 100 can suppress an increase in size of the device.

  (3) The introduction port 35 is formed by a flow path surface 35 a extending in the radial direction and the circumferential direction of the rotary shaft 20.

  The introduction port 35 is formed in a slit shape by the flat channel surface 35a, so that a sufficient channel area is secured in a limited space. Then, centrifugal force acts on the oil flowing through the introduction port 35 along the flow path surface 35 a, thereby prompting the oil to be introduced into the lubricating space 40 through the introduction port 35.

  (4) In the clutch device 100, the opening area of the supply path 26 is increased by the introduction port 35 as the piston 14 moves from the clutch non-engaged position where power is not transmitted to the clutch engaged position where power is transmitted.

  As a result, when the clutch is engaged, the opening area of the supply passage 26 is increased, and the necessary amount of oil is supplied to the sliding contact portions of the friction plates 11 and 13. Therefore, the clutch device 100 is sufficiently lubricated and cooled.

  (5) The clutch device 100 includes a communication path 52 that is branched from the supply path 26 and provided in parallel with the introduction port 35, and always communicates the supply path 26 with the lubrication space 40.

  As a result, even when the clutch is not engaged, oil is supplied from the communication passage 52 to the lubrication space 40, and each part is lubricated.

  In the said embodiment, it was set as the structure which the opening area of the supply path 26 by the inlet 35 becomes large as the piston 14 moves from a clutch non-engagement position to a clutch engagement position. Not limited to this, the opening area of the supply path 26 by the introduction port 35 may be reduced as the piston 14 moves from the clutch non-engagement position to the clutch engagement position.

  Moreover, in the said embodiment, the inlet 35 is formed in piston 14 itself. Not limited to this, the introduction port 35 may be formed in another member connected to the piston 14.

  The above description is merely an example, and the present invention is not limited to the above-described embodiments and modifications unless the features of the present invention are impaired. It is also possible to arbitrarily combine one or more of the above-described embodiments and modifications, and it is also possible to combine modifications.

11, 13 Friction plate (element that interrupts power), 14 piston, 14a inner circumference, 15 cylinder, 15b outer circumference, 20 rotation shaft, 26 supply path, 31 clutch guide (outer circumferential portion of rotation shaft), 35 introduction port, 35a Flow path surface, 40 Lubrication space, 52 Communication path, 100 Clutch device

Claims (5)

A clutch device that interrupts power by moving a piston in the axial direction of a rotating shaft,
Lubrication space where elements that interrupt power are arranged;
A supply path that opens to the outer periphery of the rotating shaft and supplies oil to the lubrication space;
An opening is formed in the inner periphery of the piston that is in sliding contact with an outer peripheral portion of the rotating shaft and extends in a radial direction of the rotating shaft, and the supply path is opened as the piston moves in the axial direction of the rotating shaft. And a clutch device characterized by comprising an inlet for changing the area. The clutch device according to claim 1,
The piston has a cylindrical tube portion that is slidably supported on an outer peripheral portion of the rotating shaft,
The clutch device is characterized in that the introduction port is formed so as to penetrate the cylinder part from the inner periphery to the outer periphery of the cylinder part. The clutch device according to claim 1 or 2,
The clutch device is characterized in that the introduction port is formed by a flow path surface extending in a radial direction and a circumferential direction of the rotation shaft. The clutch device according to any one of claims 1 to 3,
The clutch device is characterized in that an opening area of the supply path is increased by the introduction port as the piston moves from a clutch non-engagement position where power is not transmitted to a clutch engagement position where power is transmitted. The clutch device according to any one of claims 1 to 4,
A clutch device further comprising a communication path that is branched from the supply path and provided in parallel with the introduction port, and that always communicates the supply path with the lubrication space.

Images