JP2018062943A - Differential - Google Patents

Abstract

An object of the present invention is to efficiently supply lubricating oil to the inside of a differential cage. The drive pinion gear includes a drive pinion gear to which driving force from a drive source is transmitted, a ring gear meshed with the drive pinion gear, a differential cage to which the ring gear is fixed, and a housing that accommodates the drive pinion gear, the ring gear, and the differential cage. In the differential gear, the differential cage divided body 45 of the differential cage includes a plurality of ribs 61 and 62 formed radially from the center side of the rotation axis of the ring gear on one surface perpendicular to the rotation surface of the ring gear, and the rib 61 for advancing the ring gear. A lubricating oil supply hole 65 extends from the opening 65A of the rib 61 to the inner side surface of the differential cage from the portion facing the rotational direction R side of the ring gear. , and extends to a position relatively distant from the rotation axis center O of the ring gear. [Selection drawing] Fig. 4

Description

  The present invention relates to a differential device, and more particularly to a technique for supplying lubricating oil inside a differential cage of a differential device.

  2. Description of the Related Art Conventionally, a differential device (final drive device) that enables differential driving of left and right drive shafts of a vehicle is known. A ring gear is mounted in the housing of the differential device, and a differential cage (a differential case) that houses a side gear, a differential pinion gear, and the like is provided therein. Lubricating oil for lubricating each part is sealed and circulated in the housing of the differential device.

  For example, a technique is known in which lubricating oil can be supplied to the inside of the differential case by providing a lubricating oil hole in an end surface substantially perpendicular to the shaft center of the differential case (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 5-83527

  For example, as a method of supplying a larger amount of lubricating oil to the inside of the differential cage, it is conceivable to increase the amount of lubricating oil sealed in the housing of the differential, but the agitation resistance during traveling increases and fuel consumption increases. There is a problem that makes it worse. Although it is conceivable to increase the size of the lubricating oil hole for supplying the lubricating oil to the inside of the differential cage, there is a problem that the strength and durability of the differential cage decrease if the lubricating oil hole is enlarged.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a technique that can efficiently supply lubricating oil to the inside of a differential cage.

  In order to achieve the above object, a differential device according to an aspect of the present invention includes a drive pinion gear to which a driving force from a driving source is transmitted, a ring gear meshed with the drive pinion gear, and a differential cage to which the ring gear is fixed. A differential pin including a drive pinion gear, a ring gear, and a housing that houses the differential cage, wherein the differential cage has a plurality of ribs radially formed on one surface perpendicular to the rotational surface of the ring gear from the center side of the rotational axis of the ring gear And a first lubricating oil supply hole that penetrates from the portion of the rib ring gear facing the forward rotation direction to the inner surface of the differential cage, and the first lubricating oil supply hole extends from the opening in the rib to the ring gear. It is formed so as to extend to a position opposite to the rotation direction at the time of forward movement and relatively far from the rotation shaft center of the ring gear.

  In the above differential device, a plate formed so as to extend from the radially outer side of the rotating surface to the radially inner side so that the opening in the rib of the first lubricating oil supply hole intersects with the rotating surface when the ring gear rotates. You may make it further provide a member.

  The differential device further includes a second lubricating oil supply hole penetrating from a portion of the rib ring gear facing the reverse rotation direction to the inner surface of the differential cage, and the second lubricating oil introduction hole is The rib may be formed so as to extend from the opening in the rib to a position opposite to the rotational direction when the ring gear moves backward and relatively away from the center of the ring gear.

  In the above differential device, the differential cage rotates two side gears connected to each of the two drive shafts capable of transmitting the driving force, a plurality of pinion gears simultaneously meshed with the two side gears, and a plurality of pinion gears. The pinion pin that supports the pinion pin is accommodated, and the opening inside the differential cage of the first lubricating oil supply hole may be formed at a position away from the support surface of the pinion pin.

  Further, in the above differential device, the plurality of ribs include a first rib having a large width in the rotational direction of the differential cage and a second rib having a small width. The rib ring gear may be formed so as to penetrate from the portion of the ring gear facing the direction of rotation when moving forward to the inner surface of the differential cage.

  According to the present invention, lubricating oil can be efficiently supplied into the differential cage.

1 is a schematic configuration diagram showing a part of a vehicle including a differential device according to an embodiment of the present invention. 1 is a partial cross-sectional view in a vertical direction of a part of a vehicle including a differential device according to an embodiment of the present invention. It is a perspective view of the differential cage division | segmentation body which comprises the differential cage which concerns on one Embodiment of this invention. It is a top view of the side used as the outer side part of the differential cage of the differential cage division body which concerns on one Embodiment of this invention. It is a top view of the side containing the inner side part of the differential cage of the differential cage division body which concerns on one Embodiment of this invention.

  Hereinafter, a final drive device as an example of a differential device according to an embodiment of the present invention will be described with reference to the accompanying drawings. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIG. 1 is a schematic configuration diagram showing a part of a vehicle including a differential gear according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view in the vertical direction of a part of a vehicle including a differential gear according to an embodiment of the present invention. In addition, the front, back, left side, right side, upper side, and lower side shown in FIGS. 1 and 2 are indicated by arrows in the figure.

  A final drive device 40 as an example of a differential device mounted on a vehicle 10 according to an embodiment of the present invention is connected to one end of a propeller shaft 14. Left and right drive shafts 15 and 16 are connected to the final drive device 40, and left and right drive wheels 17 and 18 are attached to the ends of the left and right drive shafts 15 and 16, respectively.

  According to the final drive device 40, rotational power (driving force) of an engine (drive source) (not shown) is transmitted to the propeller shaft 14, and then left and right driven from the left and right drive shafts 15 and 16 via the final drive device 40. It is transmitted to the wheels 17 and 18.

  The final drive device 40 receives the rotational power of the engine from the drive pinion 42 via the propeller shaft 14 and distributes the rotational power to the left and right drive shafts 15 and 16 for transmission. A predetermined amount of lubricating oil (diff oil) is sealed in the housing 41, and a drive pinion 42 is inserted from the front side of the vehicle 10. The drive pinion 42 is rotatably supported on the housing 41 by bearings 52 and 53.

  A drive pinion gear 42a is provided at one end of the drive pinion 42, and a ring gear 43 is engaged with the drive pinion gear 42a. The ring gear 43 is fixed to the differential cage 44 by a bolt (not shown).

  The differential cage 44 is configured by fastening a differential cage segment 45 and a differential cage segment 46 with bolts (not shown). In the present embodiment, the ring gear 43 is fixed to the differential cage divided body 45. A pair of left and right side gears 47 and 48 are provided in the differential cage 44. The side gears 47 and 48 are splined to the left and right drive shafts 15 and 16, respectively. Further, the side gears 47 and 48 are engaged with two pairs of differential pinion gears 49 and 50 (a pair is not shown in FIG. 1). The differential pinion gears 49 and 50 are rotatably inserted into a cross-shaped spider 51 as an example of a pinion pin fixed to the differential cage 44.

  When the vehicle 10 travels forward, the ring gear 43 and the differential cage 44 rotate forward from the rear through the front side of the drawing as shown by an arrow R in FIGS. Hereinafter, the rotational direction of the ring gear 43 and the differential cage 44 during forward travel is referred to as a normal rotational direction, and the rotational direction during backward travel that is opposite to the direction is referred to as a reverse rotational direction.

  The differential cage divided body 45 is formed with a lubricating oil supply hole 65 for supplying lubricating oil from the outside of the differential cage 44 to the inside of the differential cage 44. Details of the differential cage divided body 45 and the lubricating oil supply hole 65 will be described later.

  The housing 41 is provided with an introduction plate 54 as an example of a plate member for introducing the lubricating oil flowing through the rotation of the differential cage 44 and the like into the lubricating oil supply hole 65 in the housing 41. In the present embodiment, the introduction plate 54 is disposed at a lower position in the housing 41 so as to intersect with a rotation surface through which an opening outside the lubricating oil supply hole 65 (an opening 65A described later) passes. It extends from the radially outer side to the radially inner side. According to the introduction plate 54, the lubricating oil that is rotated in the housing 41 by the rotation of the differential cage 44 is caused to flow radially inward of the rotating surface and is efficiently guided to the opening of the lubricating oil supply hole 65. As a result, the lubricating oil is efficiently supplied to the inside of the differential cage 44 through the lubricating oil supply hole 65.

  Next, details of the differential cage division 45 according to the present embodiment will be described.

  FIG. 3 is a perspective view of the differential cage divided body constituting the differential cage according to the embodiment of the present invention. FIG. 4 is a plan view of the side (left side) that is the outer portion of the differential cage of the differential cage divided body according to the embodiment of the present invention. FIG. 5 is a plan view of the side (right side) including the inner portion of the differential cage of the differential cage divided body according to the embodiment of the present invention.

  The differential cage divided body 45 includes a plurality of ribs 61 and 62 extending radially from the center O (rotation axis center) side of the rotation axis of the differential cage 44 (similar to the rotation axis of the drive shaft 15 and the rotation axis of the ring gear 43). And a plurality of bolt holes 63 for interposing bolts for fastening the differential cage segment 45 to the differential cage segment 46, and bolts for fixing the ring gear 43. A plurality of bolt holes 64.

  The rib 61 has a circumferential width that is greater than the circumferential width of the rib 62. One or more of the ribs 61 (two ribs in FIGS. 3, 4, and 5) includes a first lubrication that extends linearly from the surface facing the normal rotation direction of the differential cage 44 to the inside of the differential cage 44. A lubricating oil supply hole 65 as an example of the oil supply hole is formed. Since the opening 65A outside the lubricating oil supply hole 65 faces the normal rotation direction, the lubricating oil can be effectively introduced into the lubricating oil supply hole 65 during normal rotation. Since the circumferential width of the rib 61 is greater than that of the rib 62, sufficient strength can be ensured even if the lubricating oil supply hole 65 is formed.

  The opening 65B of the lubricating oil supply hole 65 formed on the inner surface of the differential cage 44 is formed at a position relatively distant from the rotation axis center O (for example, a position as far as possible from the inner surface of the differential cage 44). Preferably, the distance from the rotation axis center O may be substantially the same as or more than the distance from the rotation axis center O of the opening 65A. In this embodiment, the distance from the rotation axis center O in each part of the lubricating oil supply hole 65 is equal to or greater than the distance from the rotation axis center O in the opening 65B. With such a shape, when the differential cage 44 normally rotates, the force acting to inhibit the flow of the lubricating oil flowing through the lubricating oil supply hole 65 to the inside of the differential cage 44, that is, the differential cage 44 (diff cage division). The centrifugal force received by the rotation of the body 45) can be reduced. Thereby, the lubricating oil can be efficiently supplied into the differential cage 44 through the lubricating oil supply hole 65.

  Further, one or more of the ribs 61 (two ribs in FIGS. 3, 4, and 5) has a differential cage 44 from a surface facing the direction opposite to the normal rotation direction (reverse rotation direction) of the differential cage 44. A lubricating oil supply hole 66 as an example of a second lubricating oil supply hole extending linearly inward is formed. Since the opening 66A on the outside of the lubricating oil supply hole 66 faces the reverse rotation direction, the lubricating oil can be effectively introduced into the lubricating oil supply hole 66 during reverse driving.

  The opening 66B of the lubricating oil supply hole 66 formed on the inner surface of the differential cage 44 is formed at a position relatively distant from the rotation axis center O (for example, a position as far as possible from the inner surface of the differential cage 44). It is preferable that the distance from the rotation axis center O is substantially the same as or more than the distance from the rotation axis center O of the opening 66A. In this embodiment, the distance from the rotation axis center O in each part of the lubricating oil supply hole 66 is not less than the distance from the rotation axis center O in the opening 66B. With such a shape, when the differential cage 44 rotates backward, the force acting to inhibit the flow of the lubricating oil flowing through the lubricating oil supply hole 66 to the inside of the differential cage 44, that is, the differential cage 44 (diff cage division). The centrifugal force received by the rotation of the body 45) can be reduced. Accordingly, the lubricating oil can be efficiently supplied into the differential cage 44 through the lubricating oil supply hole 66.

  Further, during forward rotation, the lubricating oil supply hole 66 can discharge the lubricating oil inside the differential cage 44 to the outside of the differential cage 44, thereby efficiently distributing the lubricating oil to the inside of the differential cage 44. be able to.

  In the present embodiment, the differential cage segment 45 is provided with the lubricating oil supply hole 65 and the lubricant oil supply hole 66. For example, the differential cage segment is arranged so that the normal rotation direction is the reverse direction. Also in other differential devices, by using this differential cage divided body as it is, lubricating oil can be efficiently supplied into the differential cage.

  Next, the operation of the final drive device 40 will be described.

  When the vehicle 10 moves forward, the differential cage 44 and the ring gear 43 of the final drive device 40 rotate in the normal rotation direction (arrow R direction). At this time, in the housing 41, the lubricating oil flows in the normal rotation direction as the differential cage 44 and the ring gear 43 rotate.

  The lubricating oil that normally flows in the rotating direction collides with the introduction plate 54 below the housing 41 and flows toward the side through which the opening 65A of the lubricating oil supply hole 65 of the differential cage 44 passes.

  As a result, when the opening 65A of the lubricating oil supply hole 65 of the differential cage divided body 45 passes in the vicinity of the introducing plate 54, the lubricating oil whose flow is changed by the introducing plate 54 enters the opening 65A of the lubricating oil supplying hole 65. As a result, the lubricating oil can be efficiently introduced into the differential cage 44.

  As described above, according to the final drive device 40 according to the embodiment, the differential cage 44 has a plurality of ribs formed radially on the one surface perpendicular to the rotation surface of the ring gear 43 from the center of the rotation axis of the ring gear 43. 61, 62 and a lubricating oil supply hole 65 penetrating from the portion of the rib 61 facing the normal rotation direction of the ring gear 43 to the inner surface of the differential cage 44. The lubricating oil supply hole 65 is an opening in the rib 61. Since it is formed to extend from 65A to the opposite side of the normal rotation direction of the ring gear 43 and to a position relatively distant from the rotational axis center O of the ring gear 43, the lubricating oil is supplied to the lubricating oil supply hole 65 when the vehicle 10 moves forward. The lubricating oil can be effectively supplied to the inside of the differential cage 44 through the lubricating oil supply hole 65.

  Note that the present invention is not limited to the above-described embodiments and modifications, and can be appropriately modified and implemented without departing from the spirit of the present invention.

  For example, in the above-described embodiment, two lubricating oil supply holes 65 are provided in the differential cage 44 so as to face the normal rotation direction outside the differential cage 44. However, the present invention is not limited to this and the lubricating oil supply is not limited thereto. One hole 65 may be provided, or three or more lubricating oil supply holes 65 may be provided. In the above embodiment, the lubricating oil supply hole 66 facing the reverse rotation direction is provided in addition to the lubricating oil supply hole 65 in the normal rotation direction. However, the present invention is not limited to this, and the lubricating oil supply hole 66 facing the reverse rotation direction is provided. The facing lubricating oil supply hole 66 may not be provided.

  In the above embodiment, the introduction plate 54 is arranged below the housing 41 of the final drive device 40. However, the present invention is not limited to this, and the introduction plate 54 is located above the housing 41. You may make it arrange | position in the other position of the housing 41. FIG.

  In the above embodiment, the final drive device 40 is taken as an example of the differential device. However, the present invention is not limited to this, and the differential device, for example, is a final device that distributes the driving force by two rear shafts. It may be a drive device, a transfer device that distributes the driving force between the front shaft and the rear shaft, or the like. In short, any device that has a differential cage and supplies lubricating oil inside the differential cage may be used.

DESCRIPTION OF SYMBOLS 10 Vehicle 40 Final drive apparatus 41 Housing 42 Drive pinion 42a Drive pinion gear 43 Ring gear 44 Differential cage 45 Differential cage division body 46 Differential cage division body 47, 48 Side gear 49, 50 Differential pinion gear 51 Spider 52, 53 Bearing 54 Introduction plate 61, 62 Rib 63, 64 Bolt hole 65 Lubricating oil supply hole 65A, 65B opening 66 Lubricating oil supply hole 66A, 66B opening 67 Support surface

Claims (5)

A drive pinion gear to which driving force from a drive source is transmitted; a ring gear meshed with the drive pinion gear; a differential cage to which the ring gear is fixed; and a housing for housing the drive pinion gear, the ring gear, and the differential cage. Including differentials,
The differential cage is
A plurality of ribs radially formed on one surface perpendicular to the rotation surface of the ring gear from the rotation shaft center side of the ring gear;
A first lubricating oil supply hole penetrating from a portion of the rib facing the rotational direction side of the ring gear when moving forward to an inner surface of the differential cage;
The first lubricating oil supply hole is formed to extend from an opening in the rib to a position opposite to a rotation direction when the ring gear moves forward and relatively far from the rotation shaft center of the ring gear.   A plate member formed to extend from the radially outer side of the rotating surface to the radially inner side so that the opening in the rib of the first lubricating oil supply hole passes through when the ring gear rotates. The differential device according to claim 1, further comprising: A second lubricating oil supply hole penetrating from a portion of the rib facing the rotational direction of the ring gear when moving backward to an inner surface of the differential cage;
2. The second lubricating oil introduction hole is formed to extend from an opening in the rib to a position opposite to a rotation direction when the ring gear moves backward and to a position relatively distant from the rotation shaft center of the ring gear. The differential device according to claim 2. The differential cage rotatably supports the two side gears connected to each of the two drive shafts capable of transmitting the driving force, the plurality of pinion gears simultaneously meshed with the two side gears, and the plurality of pinion gears. Contains pinion pins,
4. The differential device according to claim 1, wherein the opening inside the differential cage of the first lubricating oil supply hole is formed at a position away from a support surface of the pinion pin. 5. The plurality of ribs include a first rib having a large width in the rotational direction of the differential cage and a second rib having a small width.
The said 1st lubricating oil supply hole is formed so that it may penetrate from the part which faces the rotation direction side of the said ring gear at the time of the said advance to the inner side surface of the said differential cage. 5. The differential device according to any one of 4 above.

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