JP2015187473A - Lubrication structure of driving power transmission mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubrication structure of a driving power transmission mechanism capable of supplying lubricating oil to friction engagement members such as clutches and brakes more efficiently than before.SOLUTION: A driving power transmission mechanism lubrication structure 100 comprises: a bearing 2 rotatably supporting a rotary shaft 1; a friction engagement member 3 provided outside of the bearing 2; and a driving power transmission member 4 disposed between the bearing 2 and the friction engagement member 3, provided to be rotatable about the bearing 2, and capable of transmitting driving power from the bearing 2 to the friction engagement member 3, the bearing 2 and the friction engagement member 3 having a positional relation of overlapping each other in an axial direction, and is configured so that the driving power transmission member 4 includes an oil supply groove 40 extending from an open end surface in which a lubricating oil supply port is formed along the axial direction; and a supply hole 41 that is a hole penetrating the friction engagement member 3 from the oil supply groove 40 and that can supply lubricating oil from the oil supply groove 40 to the friction engagement member 3.

Description

  The present invention relates to a lubricating structure for supplying lubricating oil in a driving force transmission mechanism having a structure in which a bearing is disposed on the inner peripheral side of a friction engagement member such as a clutch or a brake.

  Conventionally, regarding an automatic transmission controlled using a hydraulic clutch and a brake, a technique related to a multi-stage automatic transmission without an input joint in which an input shaft is directly connected to a prime mover has been disclosed (for example, see Patent Document 1). In this technique, a through hole is formed in a drive plate or a driven plate of a clutch (brake) to facilitate the supply of lubricating oil, and seizure of the clutch (brake) is prevented.

Japanese Patent No. 4922224

  However, the extending direction of the through hole disclosed in Patent Document 1 is substantially orthogonal to the direction of the lubricating oil blown by the centrifugal force due to the rotation in addition to being parallel to the axial direction of the rotating shaft. Therefore, there is a problem that lubricating oil cannot be efficiently supplied to the clutch (brake).

  Further, in the technique disclosed in Patent Document 1, the bearing for supporting the gear that contacts the inner diameter side of the clutch (brake) plate has a structure that wraps (overlaps) the clutch (brake) in the axial direction. There is also a problem that the lubricating oil blown off by the centrifugal force due to the rotation is blocked by the bearing, and the lubricating oil becomes more difficult to be supplied.

  Therefore, an object of the present invention is to provide a lubricating structure of a driving force transmission mechanism that can supply lubricating oil to friction engaging members such as clutches and brakes more efficiently than before.

  The lubrication structure of the driving force transmission mechanism of the present invention provided to solve the above-described problem includes a bearing that rotatably supports a rotating shaft, a friction engagement member provided outside the bearing, and the bearing. A driving force transmission member disposed between the friction engagement member and rotatably provided around the bearing, and capable of transmitting a driving force from the bearing to the friction engagement member. In a lubricating structure of a driving force transmission mechanism in which the friction engagement members overlap with each other in the axial direction, the driving force transmission member extends in the axial direction from the open end surface where the lubricating oil supply port is formed. An oil supply groove extending along the oil supply groove, and a hole extending from the oil supply groove to the friction engagement member, the oil supply hole capable of supplying the lubricating oil from the oil supply groove to the friction engagement member. Features.

  In the lubricating structure of the driving force transmission mechanism according to the present invention, the driving force transmission member includes an oil supply groove extending along the axial direction from the open end surface on which the lubricating oil supply port is formed, and friction engagement from the oil supply groove. As the drive force transmitting member rotates, the lubricating oil blown outward in the centrifugal direction due to centrifugal force is captured (catch) by the oil supply groove, and from the oil supply groove through the oil supply hole. Lubricating oil can be smoothly guided toward the friction engagement member. Thus, the lubricating oil can be efficiently supplied from the oil supply groove toward the friction engagement member. Therefore, seizure of the frictional engagement member due to running out of oil can be prevented more reliably than before.

  According to the present invention, seizure of the frictional engagement member due to oil shortage can be prevented more reliably than before.

1 is a structural diagram showing a structure of an automatic transmission X to which a lubricating structure 100 for a driving force transmission mechanism according to an embodiment of the present invention is applied. FIG. 2 is an enlarged side sectional view of the lubricating structure 100 of FIG. 1 and its periphery. FIG. 3 is a front view showing a detailed structure of an oil supply groove 40 and an oil supply hole 41 of the inner gear 4.

  The invention is schematically illustrated by the illustrated embodiment and will be described in detail below with reference to the drawings. In the following, “circumferential direction”, “axial direction”, and “radial direction” unless otherwise specified, “circumferential direction”, “axial direction”, and “radial direction” of the shaft 1 (rotating shaft). ".

  FIG. 1 is a structural diagram showing a structure of an automatic transmission X to which a lubricating structure of a driving force transmission mechanism according to an embodiment of the present invention is applied. FIG. 2 is a partially enlarged cross-sectional view showing a lubricating structure of a driving force transmission mechanism according to an embodiment of the present invention and a detailed configuration around it. A lubrication structure 100 for a driving force transmission mechanism according to this embodiment includes a bearing 2 that rotatably supports a shaft 1 (rotating shaft), and a wet multi-plate clutch 3 (friction engagement member) provided outside the bearing 2. And an inner gear 4 (drive) which is disposed between the bearing 2 and the wet multi-plate clutch 3 and is rotatably provided around the bearing 2 and capable of transmitting a driving force from the bearing 2 to the wet multi-plate clutch 3. Force bearing member), and the bearing 2 and the wet multi-plate clutch 3 have a positional relationship in which they overlap each other in the axial direction.

  As shown in FIG. 2, an oil supply passage 10 that can supply lubricating oil to the wet multi-plate clutch 3 outside the shaft 1 is provided along the axial direction inside the shaft 1 through a through passage 11 described later. Is formed. The shaft 1 is formed with a through passage 11 that communicates with the oil supply passage 10 and penetrates radially outward.

  As shown in FIG. 2, the wet multi-plate clutch 3 of the present embodiment is fixed in the circumferential direction with respect to the outer gear 30 that is attached to the inner gear 4 so as to be relatively rotatable. A plurality (six in this embodiment) of outer plates 31 provided to be slidable in the axial direction and a plurality of outer plates 31 that are fixed in the circumferential direction with respect to the inner gear 4 and slidable in the axial direction. And (in this embodiment, five) inner plates 32.

  As shown in FIG. 2, the inner gear 4 includes an oil supply groove 40 extending in the axial direction from an open end surface 4 a in which an oil supply port for lubricating oil is formed, and the wet multi-plate clutch 3 from the oil supply groove 40. And an oil supply hole 41 through which lubricating oil can be supplied from the oil supply groove 40 to the wet multi-plate clutch 3. Thereby, in this embodiment, the lubricating oil supplied via the oil supply passage 10 and the through passage 11 can be supplied from the oil supply groove 40 to the wet multi-plate clutch 3 via the oil supply hole 41.

  As shown in FIG. 3, the outer peripheral portion of the inner gear 4 has an uneven shape, and the tooth portions 42 and the tooth bottom portions 43 are alternately formed along the circumferential direction.

  A plurality (three in the present embodiment) of oil supply holes 41 are formed in the tooth bottom portion 43 at a predetermined angle along the circumferential direction. Note that the number of the oil supply holes 41 is not limited to three, and the oil supply holes 41 may be formed in at least one place. As shown in FIG. 2, two oil supply holes 41 are formed at predetermined intervals along the axial direction, but the number of oil supply holes 41 may be two or more.

  Further, as shown in FIG. 3, in the present embodiment, the oil supply groove 40 of the inner gear 4 has a semicircular shape having a virtual center on the radially inner side of the inner gear 4 in terms of easy processing. The shape of the oil supply groove 40 is not limited to this shape, and may be any shape such as a triangular shape or a square shape as long as a tool enters the oil supply groove 40.

  The oil supply groove 40 of the present embodiment also functions as a groove for a snap ring (reference numeral 5 shown in FIGS. 2 and 3) for fixing and supporting the bearing 2 on the radially inner side of the inner gear 4. As a result, when the oil supply groove 40 is viewed from the axial direction (arrow A in FIG. 2), the outer peripheral edge of the snap ring 5 can be visually recognized through the oil supply groove 40, and a space can be formed radially outward of the outer peripheral edge. The snap ring 5 can be easily removed by inserting a tool into this space. As a result, the effects of facilitating the replacement work of the snap ring 5 at the time of failure, improving the assemblability in line work, and improving the efficiency during testing can be expected.

  In the above configuration, the inner gear 4 has an oil supply groove 40 extending in the axial direction from the open end surface 4a where the oil supply port for the lubricating oil is formed, and an oil supply hole from the oil supply groove 40 to the wet multi-plate clutch 3. 41, so that the lubricating oil blown to the outside in the centrifugal direction (radially outward) by the centrifugal force with the rotation of the inner gear 4 is captured (catch) by the oil supply groove 40, and is supplied through the oil supply hole 41. Lubricating oil can be smoothly guided from the groove 40 toward the wet multi-plate clutch 3. Thereby, the lubricating oil can be efficiently supplied from the oil supply groove 40 toward the wet multi-plate clutch 3. Therefore, seizure of the wet multi-plate clutch 3 due to running out of oil can be prevented more reliably than before.

  As mentioned above, although embodiment of this invention was described based on drawing, a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  In the above embodiment, the example in which the lubricating structure of the driving force transmission mechanism according to the present invention is applied to the clutch has been described. However, the present invention is not limited to this, and the lubricating structure of the driving force transmission mechanism according to the present invention is used. You may apply to a brake.

  In the above embodiment, an example in which the portion of the oil supply groove 40 of the inner gear 4 that communicates with the tooth bottom portion 43 has the flat surface 44 parallel to the axial direction of the inner gear 4 in a side sectional view has been described. The invention is not limited to this, and the portion of the oil supply groove 40 of the inner gear 4 that communicates with the tooth bottom 43 is separated from the open end face 4a in the axial direction in the sectional side view. You may have the taper-shaped inclined surface inclined so that it may approach. As a result, the area of the oil supply port can be reduced on the open end surface 4a, so that the lubricating oil that has once flowed into the axially inner part of the inner gear 4 through the oil supply port flows out of the oil supply port. Can be suppressed.

  The lubricating structure of the driving force transmission mechanism of the present invention can be suitably used in a driving force transmission mechanism having a structure in which a bearing is disposed on the inner peripheral side of a friction engagement member such as a clutch or a brake.

1 Shaft (Rotating shaft)
DESCRIPTION OF SYMBOLS 10 Oil supply path 100 Lubrication structure 11 Through path 2 Bearing 3 Wet multi-plate clutch (friction engagement member)
30 Outer gear 31 Outer plate 32 Inner plate 4 Inner gear (driving force transmission member)
4a Open side end face 40 Oil supply groove 41 Oil supply hole 42 Tooth part 43 Tooth bottom part 44 Flat surface 5 Snap ring

Claims (1)

A bearing that rotatably supports the rotating shaft;
A friction engagement member provided on the outside of the bearing;
A driving force transmission member that is disposed between the bearing and the friction engagement member and is rotatably provided around the bearing, and capable of transmitting a driving force from the bearing to the friction engagement member;
In the lubricating structure of the driving force transmission mechanism in which the bearing and the friction engagement member have a positional relationship in which they overlap each other in the axial direction,
The driving force transmission member is
An oil supply groove extending along the axial direction from an end surface on the open side where an oil supply port for the lubricating oil is formed;
Lubricating a driving force transmission mechanism comprising: a hole extending from the oil supply groove to the friction engagement member, the oil supply hole capable of supplying the lubricant oil from the oil supply groove to the friction engagement member. Construction.