JP6942426B2 - Power transmission device - Google Patents

Description

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

In a vehicle such as an automobile, the power from the drive source is input to the transmission (transmission), and the power shifted by the transmission is transmitted to the drive wheels via a differential gear 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. The differential case 92 is formed with cylindrical cylindrical portions 94 at both ends in the center line direction (rotational axis direction) of the ring gear 93. The differential gear 91 is housed in the unit case 95, and both cylindrical portions 94 are rotatably supported by the unit case 95 via bearings 96.

Oil is sealed 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 from the transmission to the ring gear 93. 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 to become droplets, and the oil droplets are supplied to the bearing 96 and the like. .. As a result, the bearing 96 and the like are lubricated by the oil, and it is possible to prevent the bearing 96 and the like from being worn or seized.

Utility Model Registration No. 2584081

If the amount of oil accumulated in the unit case 95 is large, the oil acts as a resistance to the ring gear 93, which causes a decrease in torque transmission efficiency due to torque loss, which in turn causes a deterioration in running fuel efficiency of the vehicle.

Therefore, it is conceivable to provide oil separators 97 and 98 as partition walls on both sides of the ring gear 93 in the direction of the rotation axis so that the oil supplied to the bearing 96 does not return to the inside of the oil separators 97 and 98. .. With this configuration, it can be expected that the amount of oil accumulated in the space sandwiched between the oil separators 97 and 98, that is, the space in which the ring gear 93 is housed, is reduced.

However, although the separators 97 and 98 developed prior to the present invention are manufactured by press working on sheet metal, they have a problem that their shapes are not stable due to springback after the press working.

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

In order to achieve the above object, the power transmission device according to one aspect of the present invention is a power transmission device that transmits power, and has a case filled with oil and a rotation axis extending in a predetermined direction in the case. A scraping member that is rotatably provided in the center and is rotated by power to scoop up and scatter the oil accumulated in the case, and a scraping member that is provided on at least one side in a predetermined direction with respect to the scraping member and scrapes up. A separator that separates a first space in which members are arranged and a second space adjacent to the first space in a predetermined direction is included, and the separator is attached to a case, and at least a part thereof has a rotation axis. It has a circular ring centered on the center and is connected over the entire circumference.

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

On at least one side of the scraping member in a predetermined direction, which is the direction of the rotation axis of the scraping member, a first space in which the scraping member is arranged and a second space adjacent to the first space in a predetermined direction A separator is provided to partition the space. As a result, it is possible to prevent the oil supplied to each part from returning to the first space for accommodating the scraping member, and it is possible to reduce the amount of oil accumulated in the first space, that is, the amount of oil immersed in the scraping member. ..

Further, since the separator is attached to the case, the oil that flows down the case toward the scraping member can be blocked by the separator. As a result, the return of oil to the first space can be further suppressed, and the amount of oil immersed in the scraping member can be effectively reduced.

Further, since the separator has a portion that is annularly connected over the entire circumference at least in part, 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.

The power transmission device according to another aspect of the present invention is rotatably provided around a case filled with oil and a rotation axis extending in a predetermined direction in the case, and is rotated by power and accumulated in the case. A scraping member that scoops up and scatters the existing oil, and a first space provided on at least one side of the scraping member in a predetermined direction and adjacent to the first space and the first space in which the scraping member is arranged in a predetermined direction. The separator has a ring plate shape centered on the rotation axis, the inner peripheral portion thereof is connected over the entire circumference, and the inner peripheral portion is undulated in a predetermined direction. Has a shaped shape.

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

On at least one side of the scraping member in a predetermined direction, which is the direction of the rotation axis of the scraping member, a first space in which the scraping member is arranged and a second space adjacent to the first space in a predetermined direction A separator is provided to partition the space. As a result, it is possible to prevent the oil supplied to each part from returning to the first space in which the scraping member is arranged, and it is possible to reduce the amount of oil accumulated in the first space, that is, the amount of oil immersed in the scraping member. can.

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

Further, since the inner peripheral portion has an undulating shape in the direction of the rotation axis of the scraping member, it is possible to give a large strength to the inner peripheral portion. As a result, the shape of the separator can be kept more stable.

According to the present invention, the amount of oil soaked in the scraping member can be reduced by providing the separator. Moreover, the shape of the separator can be kept stable.

It is sectional drawing which shows the structure of the transaxle which concerns on one Embodiment of this invention. It is a perspective view which shows a part of the unit case to which one separator is 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 accompanying drawings.

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

The transaxle 1 is a transmission unit mounted on a vehicle that shifts torque generated by an engine (not shown) and transmits it to drive wheels (not shown), and is contained in a unit case 2 forming an outer shell thereof. , Torque converter 3, belt-type continuously variable transmission 4, and differential gear 5.

The differential gear 5 includes a differential case 11. The differential case 11 provides a gear accommodating space 12 inside the differential case 11. A pinion shaft 13 penetrating the gear accommodating space 12 is held in the differential case 11. Two pinion gears 14 and 15 are rotatably held on the pinion shaft 13 at intervals from each other. Further, in the gear accommodating space 12, two side gears 16 and 17 are separately arranged on both sides of the pinion shaft 13. The side gears 16 and 17 and the pinion gears 14 and 15 are both bevel gears, and the side gears 16 and 17 mesh with both of the pinion gears 14 and 15.

Further, the differential case 11 is formed with cylindrical shaft insertion portions 18 and 19 penetrating in a direction in which the side gears 16 and 17 face each other, in other words, in a direction orthogonal to the pinion shaft 13. Drive shafts 21 and 22, respectively, are inserted into the shaft insertion portions 18 and 19, respectively. The tip portions of the drive shafts 21 and 22 are coupled to the side gears 16 and 17, respectively, so as not to rotate relative to each other in the gear accommodating space 12.

Bearings 23 and 24 are externally fitted to the shaft insertion portions 18 and 19, respectively. The outer races (outer rings) of the bearings 23 and 24 are non-rotatably held in the unit case 2. As a result, the differential case 11 is rotatably supported by the unit case 2 via 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 is formed between one of the shaft insertion portions 18 and the pinion shaft 13 so as to project radially from the outer peripheral surface thereof. A ring gear 26 is fixed to the flange portion 25. The ring gear 26 integrally has a substantially annular plate-shaped web 27 surrounding the differential case 11 and a substantially cylindrical rim 28 surrounding the outer circumference of the web 27. The rim 28 projects 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 these 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. As a result, the ring gear 26 and the differential case 11 rotate integrally. The rotation of the differential case 11 is converted into the rotation of each of the side gears 16 and 17 via the pinion gears 14 and 15. As a result, 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, respectively. As a result, in the unit case 2, the first space 43 sandwiched between the separators 41 and 42 from both sides and the ring gear 26 is arranged, and the second space 44 on the outer side in the direction opposite to the separators 41 and 42. , 45 are partitioned.

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 shaft insertion portion 18 side with respect to the ring gear 26, that is, on the continuously variable transmission 4 side in the alignment direction of the torque converter 3 and the continuously variable transmission 4.

The separator 41 is formed in a shape in which a part of a substantially annular plate is cut out. The inner peripheral 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, and forms a planar shape different from that of the first flat portion 52. By being formed so as to be continuous with the two plane portions 53, the ring gear 26 has an undulating shape in the direction of the rotation axis (hereinafter, simply referred to as "rotation axis direction").

The outer peripheral portion 54 of the separator 41 is formed with recesses 55 recessed on the side opposite to the ring gear 26 side at two locations spaced apart from each other in the circumferential direction. A bolt hole 56 is formed through the recess 55. The position of the separator 41 is adjusted in the circumferential direction so that the two bolt holes 56 are located below the rotation axis of the ring gear 26, and the separator 41 is fixed to the unit case 2 by the bolts inserted into the respective bolt holes 56. ing.

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

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

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

The separator 42 is continuously formed on the substantially cylindrical inner peripheral portion 61, the intermediate portion 62 which is continuously formed on the inner peripheral portion 61 and gradually expands in diameter as the distance from the inner peripheral portion 61 is increased, and the intermediate portion 62. An outer peripheral portion 63 extending from the intermediate portion 62 in the radial direction orthogonal to the rotation axis direction is integrally provided. A part of the intermediate portion 62 and the outer peripheral portion 63 is cut out, and the inner peripheral portion 61 is not cut out and is connected over the entire circumference. The notched portion 64 of the intermediate portion 62 and the outer peripheral portion 63 includes only the portion 65 that is continuously cut out from the edge of the outer peripheral portion 63 to the boundary between the inner peripheral portion 61 and the intermediate portion 62 and the outer peripheral portion 63. Includes the notched portion 66.

The outer peripheral portion 63 is formed with recesses 67 recessed on the side opposite to the ring gear 26 side at two locations spaced apart from each other in the circumferential direction. A bolt hole 68 is formed through the recess 67. The separator 42 is inserted into each bolt hole 68 by adjusting the position in the circumferential direction so that the outer peripheral portion 63 is located on the lower side and the notched portion 64 of the intermediate portion 62 and the outer peripheral portion 63 is located on the upper side. It is fixed to the unit case 2 by the bolts.

<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 by the ring gear 26 and scattered. As a result, oil can be supplied to each part around the ring gear 26 such as bearings 23 and 24 that rotatably hold the differential case 11, and the occurrence of wear and seizure in each part can be suppressed.

Separator 41, which separates the first space 43 in which the ring gear 26 is arranged on both sides of the ring gear 26 in the direction of the rotation axis and the second spaces 44 and 45 adjacent to the first space 43 in the direction of the rotation axis. 42 is provided. As a result, it is possible to prevent the oil supplied to each portion from returning to the first space 43 accommodating the ring gear 26, and it is possible to reduce the amount of oil accumulated in the first space 43, that is, the amount of oil immersed in the ring gear 26. ..

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

Further, since the separators 41 and 42 are connected to at least a part in an annular shape over the entire circumference, that is, the separator 41 has an inner peripheral portion 51 and the separator 42 has an inner peripheral portion 61, the separator 41 Even if No. 42 is manufactured by pressing a sheet metal, deformation due to springback can be suppressed, and the shapes of the separators 41 and 42 can be kept stable.

Further, with respect to the separator 41, since the inner peripheral portion 51 connected over the entire circumference has an undulating shape in the direction of the rotation axis, the inner peripheral portion 51 can be provided with a large strength. As a result, the shape of the separator 41 can be kept more stable.

The undulations formed on the inner peripheral portion 51 may be connected over the entire circumference, or may be divided at one or a plurality of locations.

<Modification example>
Although one embodiment of the present invention has been described above, the present invention can also be implemented in other embodiments.

For example, 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 has been taken up, but if one of the separators 41 and 42 is unnecessary, one of the separators 41 and 42 is omitted. You can also do it.

Further, although the transaxle 1 is provided with a belt-type continuously variable transmission 4, the present invention is not limited to the transaxle 1 including the belt-type continuously variable transmission 4, and a method other than the belt-type transmission is used. It is widely applicable to transaxles equipped with continuously variable transmissions and stepped automatic transmissions (ATs). Further, the form of the power transmission device is not limited to the transaxle, and the differential gear 5 may be a single unit.

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

1: Transaxle (power transmission device)
2: Unit case (case)
26: Ring gear 41, 42: Separator 43: First space 44, 45: Second space 51, 61: Inner circumference

Claims (2)

A power transmission device that transmits power
A case filled with oil and
A scraping member that is rotatably provided in the case about a rotation axis extending in a predetermined direction and that rotates by power to scrape and scatter the oil accumulated in the case.
A first space provided on at least one side of the predetermined direction with respect to the scraping member and where the scraping member is arranged and a second space adjacent to the first space in the predetermined direction are partitioned. Including separator
The separator is formed continuously on an inner peripheral portion having a substantially cylindrical shape, an intermediate portion that is continuously formed on the inner peripheral portion and gradually expands in diameter as the distance from the inner peripheral portion increases, and a continuous intermediate portion. It integrally has an outer peripheral portion extending from the intermediate portion in the radial direction orthogonal to the rotation axis, and has a portion cut out in the outer peripheral portion, and is fixed to the case in the outer peripheral portion. A power transmission device in which a portion is formed in a recessed portion on the side opposite to the scraping member side, and the inner peripheral portion is connected over the entire circumference. The position of the separator is adjusted in the circumferential direction so that the notched portion is located on the upper side, and the edge facing the notched portion is inside the scraping member in the radial direction. The power transmission device according to claim 1, which is located in.

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