JP2017101774A - Differential gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a differential cage in one body and to easily fit a pinion gear and a pinion pin to the inside of the differential cage.SOLUTION: In a differential gear 40, a differential cage 44 is formed integrally, and accommodates a columnar first pinion pin 49 supporting a first pinion gear 47 rotatably and a columnar second pinion pin 50 supporting a second pinion gear 48 rotatably. On a side wall part 44c, a pair of first support holes 44d having substantially the same diameter as the diameter of the first pinion 49 for supporting outer peripheral parts at both ends of the first pinion 49 is formed and a pair of second support holes 44e having substantially the same diameter as the diameter of the second pinon pin 50 for supporting outer peripheral parts at both ends of the second pinon pin 50 is formed. The diameter of the first pinion pin 49 is larger than the diameter of the second pinion pin 50, and on the first pinion pin 49, a through-hole 49A having substantially the same diameter as the diameter of the second pinion pin 50 is formed.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a differential gear that houses four pinion gears in a differential cage.

  2. Description of the Related Art In recent years, in order to reduce the size of a differential device, there is known a differential device in which two side gears respectively connected to left and right drive shafts are connected via four pinion gears. In such a differential device, the four pinion gears are rotatably supported by the differential cage by means of cross-shaped pins (spiders).

  In order to allow the spider to be incorporated into the differential cage, the differential cage is generally made in a shape that is divided in advance at a portion that supports the spider.

  When the differential cage is divided into shapes as described above, there is a risk that it takes time to manufacture and assemble the differential cage, and the strength of the differential cage is weakened. On the other hand, a technique is known in which a differential cage is integrally formed and four pinion gears can be accommodated in the differential cage (for example, Patent Document 1 and Patent Document 2).

Japanese Patent Laid-Open No. 10-141475 JP-A-4-69438

  For example, according to the technique of Patent Document 1, although the differential case can be formed integrally, one end of the pinion shaft (pinion pin) is not directly supported by the wall portion of the differential case, but is supported using another member or the like. The strength at the supporting portion may be insufficient. Further, since further work is required to support the pinion shaft, work efficiency is poor. In addition, since a separate member is required to support the pinion shaft, it is expensive in terms of component management.

  On the other hand, according to the technique of Patent Document 2, although the gear case can be integrally formed, it is necessary to sequentially move the pinion shaft when assembling the pinion gear and the pinion shaft in the gear case, which is troublesome. There is.

  The present invention has been made in view of the above problems, and an object thereof is to provide a technique capable of integrally forming a differential cage and easily attaching a pinion gear and a pinion pin inside the differential cage. is there.

  In order to achieve the above-described object, a differential device according to an aspect of the present invention includes a ring gear meshed with a drive pinion gear fixed to two side gears connected to each of two drive shafts, and two side gears. In a differential device having a differential cage that accommodates four pinion gears that are simultaneously meshed, the differential cage is integrally formed and extends in a predetermined first direction so that two of the four pinion gears can rotate. Each of the cylindrical first pinion pin to be supported and the cylindrical second pinion pin extending in the second direction substantially orthogonal to the first direction and rotatably supporting the other two second pinion gears are accommodated. A pair of first pinion pins having substantially the same diameter as that of the first pinion pins for supporting the outer peripheral portions of both ends of the first pinion pins on the wall portion. And a pair of second pinion pin support holes having substantially the same diameter as that of the second pinion pin for supporting the outer peripheral portions of both ends of the second pinion pin, and the first pinion pin The diameter of the first pinion pin is longer than the diameter of the second pinion pin, and the first pinion pin is inserted in the substantially central portion in the first direction, and the second pinion pin is inserted through the substantially same diameter as the second pinion pin. A hole is formed.

  In the above differential device, the second pinion pin may be fixed to the differential cage by a fixing pin in the vicinity of one end side so as not to move in the second direction.

  In the differential device, the differential cage may be formed with an opening for inserting the side gear, the first pinion gear, and the second pinion gear into the internal space.

  In the above differential device, the opening may be formed between a wall portion in which the first pinion pin support hole is formed and a wall portion in which the second pinion pin support hole is formed. .

  According to the differential device of the present invention, the differential cage can be integrally formed, and the pinion gear and the pinion pin can be easily attached to the inside of 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. It is a perspective view at the time of combining two pinion pins which rotatably support four pinion gears concerning one embodiment of the present invention. It is a perspective view of the differential cage of the differential gear which concerns on one Embodiment of this invention. It is a figure which shows the state which attached the pinion gear to the differential cage which concerns on one Embodiment of this invention.

  Hereinafter, 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. In addition, the front, back, left side, and right side shown in FIG. 1 are as shown by the arrows in the figure.

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

  According to the differential device 40, the rotational power of the engine (not shown) is transmitted to the propeller shaft 14 and then transmitted from the left and right drive shafts 15, 16 to the left and right drive wheels 17, 18 via the differential device 40. The

  The differential device 40 inputs 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 51 and 52.

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).
A pair of left and right side gears 45 and 46 are provided in the differential cage 44. The side gears 45 and 46 are splined to the left and right drive shafts 15 and 16, respectively. Further, two pairs of differential pinion gears 47 and 48 (a pair is not shown in FIG. 1) mesh with the side gears 45 and 46. The differential pinion gears 47 and 48 are rotatably inserted into a first pinion pin 49 and a second pinion pin 50 fixed to the differential cage 44. The differential cage 44, the side gears 45 and 46, the differential pinion gears 47 and 48, the first pinion pin 49, and the second pinion pin 50 are used to transmit the driving force while allowing the differential to the left and right drive wheels 17 and 18. The mechanism is configured.

  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 indicated by an arrow R in FIG.

  Next, the pinion pins (49, 50) according to the present embodiment will be described.

  FIG. 2 is a perspective view when two pinion pins that rotatably support four pinion gears according to an embodiment of the present invention are combined.

  In the present embodiment, the first pinion pin 49 and the second pinion pin 50 are combined in a cross shape in the differential cage 44 as shown in FIG.

  The first pinion pin 49 is a columnar member having a diameter d1. The second pinion pin 50 is a columnar member having a diameter d2. The diameter (d1) of the first pinion pin 49 is longer than the diameter (d2) of the second pinion pin 50. The first pinion pin 49 has a diameter substantially the same as the diameter (d2) of the second pinion pin 50 so that the second pinion pin 50 can be inserted at the approximate center in the axial direction (first direction). A through hole 49A extending in a direction (second direction) substantially orthogonal to the direction is formed. Here, the term “substantially the same” is an expression including not only the same thing but also a little difference. A fixing pin 53 to be described later for fixing the second pinion pin 50 to the differential cage 44 for disabling movement of the second pinion pin 50 in the axial direction (second direction) is inserted into one end portion of the second pinion pin 50. A fixing hole 50A is formed.

  Next, the differential cage 44 according to the present embodiment will be described.

  FIG. 3 is a perspective view of the differential cage of the differential according to the embodiment of the present invention. In FIG. 3, the left and right sides when the differential cage 44 is mounted on a vehicle are as indicated by arrows in the figure.

  The differential cage 44 is integrally formed by casting, for example. An annular ring gear fixing portion 44 a to which the ring gear 43 is fixed is formed on the outer edge portion of the differential cage 44. A plurality of bolt holes 44b for inserting bolts for fixing the ring gear 43 are formed in the ring gear fixing portion 44a.

  On the inner diameter side of the ring gear fixing portion 44a of the differential cage 44, a plurality of (four in FIG. 3) side wall portions 44c (wall portions) formed to rise to the right side are formed. A pair of opposing side wall portions 44c are formed with first support holes 44d (first pinion pin support holes) for supporting the outer periphery of each end portion of the first pinion pin 49. In the pair of side wall portions 44c, second support holes 44e (second pinion pin support holes) for supporting the outer periphery of each end portion of the second pinion pin 50 are formed. The first support hole 44 d is a through hole having substantially the same diameter as that of the first pinion pin 49. Therefore, the first pinion pin 49 is inserted from the outside of the first support hole 44d of one side wall portion 44c, and the tip of the first pinion pin 49 can easily reach the first support hole 44d of the other side wall portion 44c. Can be supported. The second support hole 44 e is a through hole having a diameter substantially the same as the diameter of the second pinion pin 50. Accordingly, the second pinion pin 50 is inserted from the outside of the second support hole 44e of one side wall portion 44c, and the tip of the first pinion pin 49 can easily reach the second support hole 44e of the other side wall portion 44c. Can be supported.

  Between the side wall portions 44c of the differential cage 44 (in FIG. 3, four locations including portions not shown in the drawing), the first pinion gear 47, the second pinion gear 48, the side gears 45, 46, etc. are provided in the differential cage 44. An opening 44f for inserting the contents is formed.

  Next, a state in which the pinion gears (first pinion gear 47 and second pinion gear 48) are installed in the differential cage 44 will be described.

  FIG. 4 is a view showing a state in which the pinion gears (47, 48) are attached to the differential cage 44 according to the embodiment of the present invention. In FIG. 4, the front and rear in the case where the differential cage 44 is mounted on a vehicle are indicated by arrows in the figure. In FIG. 4, the rotation direction of the differential cage 44 when the vehicle 10 is traveling forward is a clockwise direction as indicated by an arrow R.

  In the differential cage 44, the first pinion pins 49 are supported by inserting the outer peripheral surfaces of both ends into the first support holes 44 d of the side wall portions 44 c opposed to the differential cage 44. Two first pinion gears 47 are rotatably supported by the first pinion pin 49. Here, as will be described later, the first pinion pin 49 is in a state in which the second pinion pin 50 is inserted into the through hole 49A, so that the movement in the axial direction is restricted, and the outer peripheral surfaces at both ends are in the differential cage. The state of being supported by the first support holes 44d of the opposite side wall portions 44c of 44 is maintained.

  On the other hand, the second pinion pin 50 is inserted into the through hole 49A of the first pinion pin 49, and the outer peripheral surfaces of both ends are inserted and supported in the second support holes 44e of the side wall portion 44c facing the differential cage 44. . Two second pinion gears 48 are rotatably supported by the second pinion pin 50. One end side of the second pinion pin 50 is fixed to the differential cage 44 by a fixing pin 53. Therefore, the movement of the second pinion pin 50 in the axial direction is restricted, and the state where the outer peripheral surfaces of both ends are supported by the second support holes 44e of the opposing side wall portion 44c of the differential cage 44 is maintained.

  The first pinion gear 47 and the second pinion gear 48 have the same external gear shape, but the diameter of the through hole into which the pinion pin is inserted is a diameter that matches the diameter of the pinion pin that supports each pinion gear 47. ing. That is, the diameter of the through hole of the first pinion gear 47 is substantially the same as the diameter of the first pinion pin 49, and the diameter of the through hole of the second pinion gear 48 is substantially the same as the diameter of the second pinion pin 50.

  Next, an example of a method for assembling the contents in the differential cage 44 according to the embodiment of the present invention will be described.

  First, parts to be accommodated in the differential cage 44 are prepared. Next, the side gears 45, 46, the two first pinion gears 47, and the two second pinion gears 48 are inserted into the differential cage 44 from the opening 44f and arranged at predetermined attachment positions.

  Next, the first pinion pin 49 is inserted into the differential cage 44 from the first support hole 44 d of the side wall portion 44 c and further inserted so as to be inserted into the through holes of the two first pinion gears 47. The tip is made to reach the first support hole 44d of the side wall 44c on the other end side. This operation is easy because it is only necessary to insert the first pinion pin 49 linearly from the outside of the first support hole 44d.

  Next, the second pinion pin 50 is inserted into the differential cage 44 from the second support hole 44e of the side wall 44c so as to be inserted into the through hole of the two second pinion gears 48 and the through hole 49A of the first pinion pin 49. Furthermore, it inserts so that the front-end | tip of the 2nd pinion pin 50 may reach | attain the 2nd support hole 44e of the side wall part 44c on the other end side. This operation is easy because it is only necessary to insert the second pinion pin 50 linearly from the outside of the second support hole 44e.

  Thereafter, the second pinion pin 50 is fixed to the differential cage 44 by the fixing pin 53. As a result, the assembly of the contents in the differential cage 44 is completed.

  As described above, according to the differential device 40 according to the present embodiment, since the differential cage 44 is integrally formed, the number of parts of the differential device 40 can be reduced and the strength of the differential cage 44 is ensured. can do.

  In addition, a first support hole 44d for supporting the first pinion pin 49 and a second support hole 44e for supporting the second pinion pin 50 are formed in the differential cage 44, and the diameter of the first pinion pin 49 is changed to the first pinion pin 49. A through hole 49A having a diameter substantially the same as the diameter of the second pinion pin 50, which is longer than the diameter of the second pinion pin 50 and into which the second pinion pin 50 is inserted in the substantially central portion of the first pinion pin 49 in the axial direction. Therefore, the first pinion pin 49 and the second pinion pin 50 are inserted into the differential cage 44 from the first support hole 44d and the second support hole 44e, respectively. Objects can be assembled easily and appropriately.

  In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably and can implement.

  For example, in the above embodiment, the openings 44f are formed at four locations between the side wall portion 44c in which the first support hole 44d is formed and the side wall portion 44c in which the second support hole 44e is formed. However, the present invention is not limited to this, and the number of openings 44f may be any one of 1 to 3. Further, the positions and the number of openings formed in the differential cage 44 are not limited to the above, and any positions and arbitrary numbers may be used as long as the strength of the differential cage can be secured and the contents can be inserted therein.

  In the above embodiment, the diameter of the through hole 49A of the first pinion pin 49 is substantially the same as the diameter of the second pinion pin 50. However, the present invention is not limited to this, for example, near the entrance of the through hole 49A. May be gradually shortened from a diameter longer than the diameter of the second pinion pin 50. In this way, the second pinion pin 50 is easily guided to the through hole 49A of the first pinion pin 49 during assembly. Can be assembled easily.

  Further, the vicinity of the inlet of at least one of the first support hole 44d or the second support hole 44e may be gradually shortened from the long diameter, and in this way, the first pinion pin 49 or the second pinion pin 50 may be The first support hole 44d or the second support hole 44e can be easily guided, and assembly is facilitated.

DESCRIPTION OF SYMBOLS 10 Vehicle 40 Differential device 42 Drive pinion 42a Drive pinion gear 43 Ring gear 44 Differential cage 44c Side wall part 44f Opening part 44d 1st support hole 44e 2nd support hole 47 1st pinion gear 48 2nd pinion gear 49 1st pinion pin 49A Through-hole 50 1st 2 pinion pin 50A fixing hole 53 fixing pin

Claims (4)

In a differential device having a differential cage in which a ring gear meshed with a drive pinion gear is fixed and accommodates two side gears connected to each of two drive shafts and four pinion gears meshed with the two side gears simultaneously. ,
The differential cage is integrally formed, extends in a predetermined first direction, and a cylindrical first pinion pin that rotatably supports two first pinion gears out of the four pinion gears, and is substantially orthogonal to the first direction. Each of the cylindrical second pinion pins extending in the second direction and rotatably supporting the other two second pinion gears is accommodated, and the outer peripheral portions at both ends of the first pinion pins are supported by the wall portions. A pair of first pinion pin support holes having a diameter substantially the same as the diameter of the first pinion pin, and a diameter of the second pinion pin for supporting outer peripheral portions at both ends of the second pinion pin. A pair of second pinion pin support holes having a diameter are formed,
The diameter of the first pinion pin is longer than the diameter of the second pinion pin,
The differential device in which the first pinion pin is formed with a through-hole having a diameter substantially the same as the diameter of the second pinion pin into which the second pinion pin is inserted at a substantially central portion in the first direction. 2. The differential device according to claim 1, wherein the second pinion pin is fixed to the differential cage by a fixing pin in the vicinity of one end side so as not to move in the second direction. The differential device according to claim 1, wherein an opening for inserting the side gear, the first pinion gear, and the second pinion gear into an internal space is formed in the differential cage. The difference according to claim 3, wherein the opening is formed between a wall portion in which the first pinion pin support hole is formed and a wall portion in which the second pinion pin support hole is formed. Moving device.

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