JP2019100419A - Power transmission device - Google Patents

Abstract

To provide a power transmission device which can reduce an amount of oil in which a scoop-up member for scooping up the oil by a separator is immersed, and can stably hold a shape of the separator.SOLUTION: Separators 41, 42 for defining a first space 43 in which a ring gear 26 is arranged, and second spaces 44, 45 adjoining each other in a rotation axial line direction with respect to the first space 43 are arranged at both sides in the rotation axial line direction with respect to the ring gear 26. The separators 41, 42 are attached to a unit case 2. Furthermore, the separators 41, 42 have at least partially portions which are annularly connected over the whole periphery, that is, the separator 41 has an internal peripheral part 51, and the separator 42 has an internal peripheral part 61.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power transmission device mounted on a vehicle and transmitting power.

  In a vehicle such as an automobile, power from a drive source is input to a transmission (transmission), and the power shifted by the transmission is transmitted to the drive wheels via a differential gear (differential) or the like.

  FIG. 4 is a cross-sectional view of a conventional differential gear.

  The differential gear 91 integrally includes a differential case 92 and a ring gear 93 projecting outward from the differential case 92. In the differential case 92, cylindrical cylindrical portions 94 are formed at both end portions in the center line direction (rotational axis direction) of the ring gear 93. Differential gear 91 is housed in unit case 95, and both cylindrical portions 94 are rotatably supported by unit case 95 via bearings 96.

  An oil is enclosed in the unit case 95, and a part of the ring gear 93 is immersed in the oil accumulated in the unit case 95. Power is transmitted to the ring gear 93 from the transmission. When power is transmitted to the ring gear 93, the differential case 92 and the ring gear 93 rotate, and the oil accumulated in the unit case 95 is scraped up by the ring gear 93 and becomes droplets, and the oil droplets are supplied to the bearing 96 etc. . As a result, the bearings 96 and the like are lubricated with oil, and the occurrence of wear and seizing on the bearings 96 and the like can be prevented.

Utility model registration No. 2584081

  If the amount of oil accumulated in the unit case 95 is large, the oil acts as a resistance of the ring gear 93, resulting in a reduction in torque transmission efficiency due to a torque loss, and in turn, a deterioration in the traveling fuel efficiency of the vehicle.

  Therefore, it is conceivable that oil separators 97 and 98 serving as partition walls are respectively provided on both sides in the rotational axis direction with respect to the ring gear 93 so that oil supplied to the bearing 96 does not return inside the oil separators 97 and 98. . With this configuration, it is possible to expect a reduction in the amount of oil accumulated in the space between the oil separators 97 and 98, that is, the space in which the ring gear 93 is accommodated.

  However, although the separators 97 and 98 developed prior to the present invention are manufactured by pressing a sheet metal, there is a problem that the shape is not stable due to spring back after the pressing.

  An object of the present invention is to provide a power transmission device capable of reducing the amount of oil soaked by a scraping member that scrapes oil by providing a separator and keeping the shape of the separator stable. .

  In order to achieve the above object, a power transmission device according to one aspect of the present invention is a power transmission device for transmitting power, comprising: a case in which oil is enclosed; and a rotation axis extending in a predetermined direction in the case A scraping member is rotatably provided at the center and is rotated by power to scrape and scatter oil accumulated in the case, and is provided on at least one side in a predetermined direction with respect to the scraping member, scraping The separator includes a first space in which the member is disposed and a separator that defines a second space adjacent to the first space in a predetermined direction, and the separator is attached to the case, and at least a part of the rotation axis It has an annular portion centered at the center and a portion connected over the entire circumference.

  According to this configuration, the oil is accumulated in the case, and when the raking member rotates, the accumulated oil is scraped up and scattered by the raking member. As a result, oil can be supplied to each part around the raking member, such as a bearing that rotatably holds the raking member, and the occurrence of wear and seizure can be suppressed.

  A first space in which the raking member is disposed and a second space adjacent to the first space in a predetermined direction on at least one side of the raking member in a predetermined direction which is a rotational axis direction of the raking member A separator is provided to partition the As a result, it is possible to suppress that the oil supplied to each part returns to the first space for containing the scraping member, and it is possible to reduce the amount of oil accumulated in the first space, that is, the amount of oil in which the scraping member is soaked .

  Further, since the separator is attached to the case, the oil can be prevented from flowing down along the case toward the raking member by the separator. As a result, it is possible to further suppress the return of oil to the first space, and to effectively reduce the amount of oil in which the raking member is immersed.

  Furthermore, since the separator has at least a part an annular portion connected over the entire circumference, deformation due to springback can be suppressed even if the separator is manufactured by pressing a sheet metal. , The shape of the separator can be kept stable.

  A power transmission device according to another aspect of the present invention is provided rotatably with a case in which oil is enclosed and a rotation axis extending in a predetermined direction in the case, and is rotated by power and stored in the case. A scraping member for scraping and scattering oil, and at least one side in a predetermined direction with respect to the scraping member, and adjacent to the first space in which the scraping member is disposed and the first space in a predetermined direction And the separator has an annular plate shape centered on the rotation axis, the inner periphery is connected over the entire circumference, and the inner periphery is undulated in a predetermined direction It has a different shape.

  According to this configuration, the oil is accumulated in the case, and when the raking member rotates, the accumulated oil is scraped up and scattered by the raking member. As a result, oil can be supplied to each part around the raking member, such as a bearing that rotatably holds the raking member, and the occurrence of wear and seizure can be suppressed.

  A first space in which the raking member is disposed and a second space adjacent to the first space in a predetermined direction on at least one side of the raking member in a predetermined direction which is a rotational axis direction of the raking member A separator is provided to partition the As a result, the oil supplied to each part can be prevented from returning to the first space in which the scraping member is disposed, and the amount of oil accumulated in the first space, that is, the amount of oil in which the scraping member is soaked can be reduced. it can.

  Further, since the separator has an annular plate shape and the inner peripheral portion is connected over the entire circumference, even if the separator is manufactured by pressing a sheet metal, it is possible to suppress deformation due to spring back. , The shape of the separator can be kept stable.

  Furthermore, since the inner circumferential portion has a shape that is raised and lowered in the rotational axis direction of the raking member, the inner circumferential portion can have a large strength. As a result, the shape of the separator can be kept more stable.

  According to the present invention, by providing the separator, it is possible to reduce the amount of oil in which the raking member is soaked. In addition, the shape of the separator can be kept stable.

It is a sectional view showing the composition of the transaxle concerning one embodiment of the present invention. It is a perspective view which shows a part of unit case to which one separator was attached. It is a perspective view of the other separator. It is sectional drawing of the conventional differential gear.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

<Transaxle>
FIG. 1 is a cross-sectional view showing the configuration of a transaxle 1 according to an embodiment of the present invention. In addition, in FIG. 1, provision of the hatching showing a cross section is abbreviate | omitted.

  The transaxle 1 is a transmission unit mounted on a vehicle to shift the torque generated by an engine (not shown) and transmit it to drive wheels (not shown). , A torque converter 3, a belt type continuously variable transmission 4 and a differential gear 5.

  The differential gear 5 is provided with a differential case 11. The differential case 11 provides a gear accommodation space 12 therein. A pinion shaft 13 penetrating the gear housing space 12 is held by the differential case 11. Two pinion gears 14 and 15 are rotatably held at an interval from each other on the pinion shaft 13. Further, in the gear housing space 12, two side gears 16 and 17 are disposed separately on both sides of the pinion shaft 13. Each of the side gears 16 and 17 and the pinion gears 14 and 15 is a bevel gear, and each side gear 16 and 17 is in mesh with both of the pinion gears 14 and 15.

  The differential case 11 is formed with cylindrical shaft insertion portions 18 and 19 penetrating in the direction in which the side gears 16 and 17 face each other, in other words, in the direction orthogonal to the pinion shaft 13. The drive shafts 21 and 22 are respectively inserted into the shaft insertion portions 18 and 19. The tip end portions of the drive shafts 21 and 22 are non-rotatably coupled to the side gears 16 and 17 in the gear housing space 12 respectively.

  Bearings 23, 24 are externally fitted to the shaft insertion portions 18, 19, respectively. The outer races (outer rings) of the bearings 23 and 24 are non-rotatably held by the unit case 2. Thus, the differential case 11 is rotatably supported by the unit case 2 via the bearings 23 and 24 around the same rotation axis as the drive shafts 21 and 22.

  Further, in the differential case 11, a flange portion 25 protruding in the radial direction from the outer peripheral surface is formed between one shaft insertion portion 18 and the pinion shaft 13. The ring gear 26 is fixed to the flange portion 25. The ring gear 26 integrally has a substantially annular plate-like web 27 surrounding the differential case 11 and a substantially cylindrical rim 28 surrounding the outer periphery of the web 27. The rims 28 project from the web 27 on both sides in the direction along the rotation axis of the differential case 11. Gear teeth are formed on the outer peripheral surface of the rim 28, and the gear teeth mesh with the output gear 31 of the continuously variable transmission 4.

  The power output from the continuously variable transmission 4 is transmitted from the output gear 31 to the ring gear 26. Thereby, the ring gear 26 and the differential case 11 rotate integrally. The rotation of the differential case 11 is converted to the rotation of the side gears 16 and 17 through the pinion gears 14 and 15, respectively. Thus, the drive shafts 21 and 22 rotate integrally with the side gears 16 and 17, and the rotation of the drive shafts 21 and 22 is transmitted to the drive wheels of the vehicle.

<Separator>
In the unit case 2, separators 41 and 42 serving as partition walls are provided on both sides of the ring gear 26 in the direction along the rotation axis of the ring gear 26. Thus, in the unit case 2, the first space 43 in which the ring gear 26 is disposed is sandwiched by the separators 41 and 42 from both sides, and the second space 44 on the outer side of the separators 41 and 42 in the opposing direction. , 45 are divided.

  FIG. 2 is a perspective view showing a part of the unit case 2 to which the separator 41 is attached.

  The separator 41 is provided on the side of the shaft insertion portion 18 with respect to the ring gear 26, that is, on the side of the continuously variable transmission 4 in the direction in which the torque converter 3 and the continuously variable transmission 4 are aligned.

  The separator 41 is formed in a shape in which a part of a substantially annular plate shape is cut away. The inner circumferential portion 51 of the separator 41 is not cut out and is connected over the entire circumference. The inner peripheral portion 51 connected over the entire circumference is inclined from the planar first flat portion 52 along the inner peripheral edge to the side opposite to the ring gear 26 side to form a stepped planar shape with the first flat portion 52. By being formed so as to be continuous with the two flat surface portion 53, the ring gear 26 has a shape that is undulated in the direction of the rotation axis of the ring gear 26 (hereinafter simply referred to as "rotational axis direction").

  In the outer peripheral portion 54 of the separator 41, concave portions 55 recessed on the side opposite to the ring gear 26 side are formed at two places spaced in the circumferential direction. A bolt hole 56 is formed through the recess 55. The separator 41 has its circumferential position adjusted so that the two bolt holes 56 are located lower than the rotation axis of the ring gear 26, and is fixed to the unit case 2 by the bolts inserted into the bolt holes 56. ing.

  Further, a surface 57 extending in the rotational axis direction is formed in the unit case 2, and a groove 58 recessed toward the rotational axis of the ring gear 26 is formed in the surface 57. The groove portion 58 is curved in an arc shape centering on a straight line extending in the rotational axis direction, and one end in the rotational axis direction is closed by the inner circumferential portion 51 of the separator 41. Thereby, the oil (for example, the lubricating oil of the clutch C) flowing from the continuously variable transmission 4 is collected in the groove portion 58. The oil flowing toward the separator 41 through the groove 58 is stopped by the inner peripheral portion 51 of the separator 41 when it reaches the end of the groove 58 and supplied to the bearing 23 from the gap between the inner peripheral portion 51 and the unit case 2 Ru. Therefore, the bearing 23 can be sufficiently lubricated with oil.

  FIG. 3 is a perspective view of the separator 42. FIG.

  The separator 42 is provided on the side of the shaft insertion portion 19 with respect to the ring gear 26, that is, on the side of the torque converter 3 in the direction in which the torque converter 3 and the continuously variable transmission 4 are aligned.

  The separator 42 is formed continuously with the substantially cylindrical inner circumferential portion 61 and the inner circumferential portion 61, and is continuously formed with the intermediate portion 62 gradually expanding in diameter as it is separated from the inner circumferential portion 61. And an outer peripheral portion 63 extending in the radial direction orthogonal to the rotation axis direction from the intermediate portion 62 in an integrated manner. The middle portion 62 and the outer peripheral portion 63 are partially cut away, and the inner peripheral portion 61 is not cut out and is connected over the entire circumference. The cut-out portions 64 of the intermediate portion 62 and the outer peripheral portion 63 are continuously cut from the edge of the outer peripheral portion 63 to the boundary between the inner peripheral portion 61 and the intermediate portion 62 and only the outer peripheral portion 63 And includes a cutaway portion 66.

  In the outer peripheral portion 63, concave portions 67 which are concave on the side opposite to the ring gear 26 side are formed at two places spaced in the circumferential direction. A bolt hole 68 is formed through the recess 67. The circumferential direction of the separator 42 is adjusted so that the outer peripheral portion 63 is located on the lower side, and the notches 64 of the intermediate portion 62 and the outer peripheral portion 63 are located on the upper side, and the separator 42 is inserted into each bolt hole 68 It is fixed to the unit case 2 by the bolt.

<Function effect>
According to this configuration, oil is accumulated in the unit case 2, and when the ring gear 26 rotates, the accumulated oil is scraped up and scattered by the ring gear 26. As a result, oil can be supplied to each part around the ring gear 26 such as the bearings 23 and 24 that rotatably hold the differential case 11, and the occurrence of wear and seizure can be suppressed.

  A separator 41 for dividing a first space 43 in which the ring gear 26 is disposed and second spaces 44 and 45 adjacent to the first space 43 in the rotational axis direction on both sides of the ring gear 26 in the rotational axis direction, 42 are provided. As a result, the oil supplied to each part can be prevented from returning to the first space 43 accommodating the ring gear 26, and the amount of oil accumulated in the first space 43, that is, the amount of oil in which the ring gear 26 is immersed can be reduced. .

  Since the separators 41 and 42 are attached to the unit case 2, the separators 41 and 42 can block oil flowing down toward the ring gear 26 along the unit case 2. As a result, the return of oil to the first space 43 can be further suppressed, and the amount of oil in which the ring gear 26 is immersed can be effectively reduced.

  Furthermore, since the separators 41 and 42 have an annular portion at least in part and are connected over the entire circumference, that is, the separator 41 has the inner peripheral portion 51 and the separator 42 has the inner peripheral portion 61 , 42 can be produced by pressing a sheet metal, deformation due to spring back can be suppressed, and the shapes of the separators 41, 42 can be kept stable.

  Further, in the separator 41, since the inner circumferential portion 51 connected over the entire circumference has a shape that is raised and lowered in the rotation axis direction, the inner circumferential portion 51 can have a large strength. As a result, the shape of the separator 41 can be maintained more stably.

  The undulations formed in the inner circumferential portion 51 may be connected over the entire circumference, or may be divided at one or more locations.

<Modification>
As mentioned above, although one Embodiment of this invention was described, this invention can also be implemented with another form.

  For example, although the configuration in which the separators 41 and 42 are provided on both sides of the ring gear 26 in the direction along the rotation axis of the ring gear 26 is taken up, if one of the separators 41 and 42 is unnecessary, one is omitted It can also be done.

  The transaxle 1 is provided with a belt type continuously variable transmission 4, but the present invention is not limited to the transaxle 1 provided with the belt type continuously variable transmission 4, and other types of belt type The present invention can be widely applied to a transaxle equipped with a continuously variable transmission, a stepped automatic transmission (AT), and the like. Furthermore, the form of the power transmission device is not limited to the transaxle, and may be a single unit of the differential gear 5.

  In addition, various design changes can be made to the above-described configuration within the scope of the matters described in the claims.

1: Transaxle (power transmission)
2: Unit case (case)
26: ring gear 41, 42: separator 43: first space 44, 45: second space 51, 61: inner circumferential portion

Claims (2)

A power transmission device for transmitting power,
With a case filled with oil,
A scraping member rotatably provided about the rotational axis extending in a predetermined direction in the case and rotated by power to scrape and scatter oil accumulated in the case;
The first space is provided on at least one side of the predetermined direction with respect to the raking member, and a first space in which the raking member is disposed and a second space adjacent to the first space in the predetermined direction are partitioned. Including a separator and
The power transmission device, wherein the separator is attached to the case, and at least a part of the separator is connected in an annular shape centered on the rotation axis and connected over the entire circumference. A power transmission device for transmitting power,
With a case filled with oil,
A scraping member rotatably provided about the rotational axis extending in a predetermined direction in the case and rotated by power to scrape and scatter oil accumulated in the case;
The first space is provided on at least one side of the predetermined direction with respect to the raking member, and a first space in which the raking member is disposed and a second space adjacent to the first space in the predetermined direction are partitioned. Including a separator and
The power transmission is formed in an annular plate shape centered on the rotation axis, the inner circumferential portion is connected over the entire circumference, and the inner circumferential portion has a shape that is uneven in the predetermined direction. apparatus.

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