JP2010144904A - Lubricating structure of rotary member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately feed a lubricating oil via an outer space of a bearing. <P>SOLUTION: A lubricating structure for a rotary member includes a differential carrier 7 which has a bearing supporting hole 25 and houses a lubricating oil inside an inner housing space 15, a differential case 9 arranged inside the housing space 15 to be freely rotatably supported to the bearing supporting hole 25 via a tapered roller bearing 35 and an oil passage 65 formed in the bearing supporting hole 25 and along an outer race 39 of the tapered roller bearing 35 to make the housing space 15 and an outer space 43 of the tapered roller bearing 35 communicate with each other. In the lubricant structure, the oil passage 65 is equipped with a lip part 73 extending to a lower part than the outer race 39 of the tapered roller bearing 35 to drop the lubricating oil from the oil passage 65. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lubricating structure for a rotating member such as a differential case of a differential device, for example.

  As a conventional lubricating structure for a rotating member, for example, there is a structure applied to a rear differential device as disclosed in Patent Document 1. In this rear differential device, a differential case, which is a rotating member, is disposed in an accommodation space of a case body that accommodates lubricating oil. The differential case is rotatably supported in a bearing support hole of the case body via a bearing.

  The bearing support hole is provided with an oil passage that is formed along the bearing and communicates the housing space and the outer space of the bearing. As a result, the rear differential device can supply lubricating oil from the housing space to the inner peripheral side of the boss portion via the outer space.

  However, in the conventional structure, the lubricating oil is sucked into the bearing from the outer space and cannot be appropriately supplied to the inner peripheral side of the boss portion.

Japanese Utility Model Publication No. 62-194242

  The problem to be solved is that the lubricating oil cannot be properly supplied through the outer space by sucking the bearing.

  The present invention provides a housing having a bearing support hole and containing the lubricating oil in an internal housing space, and the bearing support disposed in the housing space in order to appropriately supply the lubricating oil through the outer space of the bearing. And an oil passage that is formed along the outer race of the bearing and communicates the housing space with the outer space of the bearing. The rotation member is provided with a lubricating structure, and the oil passage includes a tongue that extends downward from the outer race of the bearing and drops the lubricating oil from the oil passage. And

  The present invention includes a housing that has a bearing support hole and that contains lubricating oil in an internal storage space, and a rotating member that is disposed in the storage space and is rotatably supported by the bearing support hole via a bearing. A rotating member lubrication structure provided in the bearing support hole and provided with an oil passage that is formed along the outer race of the bearing and communicates the housing space and the outer space of the bearing. Since the tongue portion extends downward from the outer race of the bearing and drops the lubricating oil from the oil passage, the lubricating oil can be dropped from below the outer race of the bearing by the tongue portion.

  As a result, the suction of the lubricating oil by the bearing can be suppressed, and the lubricating oil can be appropriately supplied through the outer space.

  The purpose of properly supplying the lubricating oil through the outer space of the bearing was realized by dripping the lubricating oil.

[Differential equipment]
FIG. 1 is a side view showing a differential apparatus to which a lubricating structure for a rotating member according to Embodiment 1 of the present invention is applied, and FIG. 2 is a cross-sectional view of an essential part taken along line II-II of the differential apparatus of FIG. . In FIG. 2, since the left and right structures of the differential device are substantially the same, only the left half is shown. For the right half, symbols are displayed in parentheses on the corresponding components of the left half.

  As shown in FIGS. 1 and 2, the differential device 1 is disposed between axle shafts 3 and 5 that are output shafts of left and right front wheels or rear wheels, for example. The differential apparatus 1 includes a differential carrier 7 as a housing and a differential case 9 as a rotating member disposed in the differential carrier 7.

  The differential carrier 7 has a carrier cover 13 attached to a carrier body 11 with a plurality of bolts 12 in the circumferential direction. A housing space 15 for housing and holding lubricating oil is formed in the differential carrier 7. Axle shafts 3 and 5 are inserted into the left and right sides of the differential carrier 7 through insertion holes 17 and 19. A sealing member 21 (23) for sealing is interposed between the insertion hole 17 (19) and the axle shaft 3 (5). In the insertion hole 17 (19), a bearing support hole 25 (27) formed of a circular recess is formed inside the seal member 21 (23).

  The differential case 9 is provided with cylindrical boss portions 29 and 31 at both axial end portions (left and right end portions). The axle shaft 3 (5) is supported through the boss portion 29 (31). At the axial end of the boss 29 (31), two notches 33 are provided in a plurality of circumferential directions, for example, every 180 °. The notch 33 is formed to penetrate between the inner and outer periphery of the boss portion 29 (31).

  The boss 29 (31) is arranged on the inner peripheral side of the bearing support hole 25 (27) of the differential carrier 7. A tapered roller bearing 35 (37) as a bearing is interposed between the boss portion 29 (31) and the bearing support hole 25 (27). As the bearing, other bearings such as a ball bearing can be used.

  In the tapered roller bearing 35 (37), the inner race 38 is disposed so as to be displaced in the axial direction with respect to the outer race 39. The outer race 39 is supported by the bearing support hole 25 (27) of the differential carrier 7, and the inner race 38 is supported by the outer periphery of the boss portion 29 (31) of the differential case 9. Accordingly, in the differential case 9, the boss portion 29 (31) is rotatably supported by the bearing support hole 25 (27) by the tapered roller bearing 35 (37).

  Between the outer race 39 and the bearing support hole 25 (27) in the axial direction, a shim 41, which will be described later, is driven to apply a preload. Outside the taper roller bearing 35 (37) in the axial direction, the outer space 43 (45) is formed by the insertion hole 17 (19) of the differential carrier 7, the seal member 21 (23), and the axle shaft 3 (5). Is partitioned.

  A circumferential flange portion 47 is provided on the outer periphery of the differential case 9, and a ring gear 49 is fastened and fixed to the flange portion 47. Therefore, the differential case 9 is subjected to rotational input via the ring gear 49. A differential mechanism 51 is housed in the differential case 9.

  The differential mechanism 51 is of a bevel gear type and includes a pinion shaft 53, a pinion gear 55, and left and right side gears 57 and 59. The pinion shaft 53 is fitted and fixed to the differential case 9 and is prevented from coming off by a spring pin 61. A pinion gear 55 is rotatably supported on the pinion shaft 53. Side gears 57 and 59 mesh with the pinion gear 55. The side gears 57 and 59 are allowed to rotate relative to each other by the rotation of the pinion gear 55.

On the inner peripheral side of the side gear 57 (59), the ends of the left and right axle shafts 3 (5) are spline-engaged. Therefore, the axle shaft 3 (5) is interlocked and connected to the differential mechanism 51. That is, the axle shafts 3 and 5 are differentially rotated through the pinion shaft 53, the pinion gear 55, and the side gears 57 and 59 when a rotational input is made to the differential case 9 of the differential mechanism 51. Is allowed to transmit the rotational force.
[Lubrication structure]
Next, a lubricating structure according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 3 is a front view showing a shim used in the lubricating structure according to Embodiment 1 of the present invention.

  As shown in FIG. 2, the lubricating structure of the present embodiment includes an oil passage 65 (67) that communicates the accommodating space 15 and the outer space 43 (45). The oil passage 65 (67) is a concave groove formed in the bearing support hole 25 (27). The oil passage 65 (67) is provided along the outer race 39 of the tapered roller bearing 35 (37).

  The communication port 69 for the accommodation space 15 of the oil passage 65 (67) is disposed above the outer race 39 of the tapered roller bearing 35 (37), and is connected to the outer space 43 (45) of the oil passage 65 (67). The communication port 71 is disposed on the outer side in the axial direction of the outer race 39 of the tapered roller bearing 35 (37). A tongue 73 is provided at the communication port 71 of the oil passage 65 (67) via the shim 41.

  The shim 41 is formed of a circular plate as shown in FIGS. The shim 41 is interposed between the oil passage 65 (67) and the tapered roller bearing 35 (37), and is disposed along the opening edge of the communication port 71 of the oil passage 65 (67).

  The outer periphery 75 of the shim 41 is fitted in the bearing support hole 25 (27), and the inner periphery 77 is opposed to the outer race 39 and the inner race 38 of the tapered roller bearing 35 (37) in the axial direction. ing. On the inner periphery 77 of the shim 41, a plurality of convex portions 79 are integrally provided at a predetermined pitch in the circumferential direction. Each convex portion 79 extends from the inner periphery 77 of the shim 41 to the inner diameter side, and faces the inner race 38 of the tapered roller bearing 35 (37) so as to overlap in the axial direction. . The tip of each convex portion 79 has a curvature corresponding to the circumferential shape of the shim 41, and edges 81 and 83 are formed on both sides in the circumferential direction.

  Any one of the plurality of convex portions 79 is disposed below the communication port 71 of the oil passage 65 (67) to form a tongue portion 73. Accordingly, the tongue 73 extends downward from the outer race 39 of the tapered roller bearing 35 (37). A gap D is formed between the tongue 73 and the inner race 38 of the tapered roller bearing 35 (37) in the axial direction due to the displacement of the inner race 38 in the axial direction.

  In the lubricating structure of the present embodiment, as shown in FIG. 2, the lubricating oil splashed up by the ring gear 49 in the accommodating space 15 passes from the accommodating space 15 to the outer space 43 (45) via the oil passage 65 (67). ). The lubricating oil guided to the outer space 43 (45) flows down from the communication port 71 of the oil passage 65 (67) to the inner peripheral side through the outer surface 85 of the shim 41. For this reason, lubricating oil can be guided to the lower part of the outer race 39 of the taper roller bearing 35 (37).

  Then, the lubricating oil further flows down along the outer surface 87 of the tongue 73 and drops from the tip of the tongue 73. Therefore, the tongue 73 can guide and drop the lubricating oil to a portion overlapping the inner race 38 of the tapered roller bearing 35 (37).

  Even if the tongue 73 is displaced in the circumferential direction with respect to the lower side of the communication port 71 of the oil passage 65 (67), the lubricating oil flows down along the outer surface 85 and the inner periphery 77 of the shim 41, It can be reliably dripped through the tongue part 73 which consists of the convex part 79. FIG.

The dropped lubricating oil adheres to the axle shaft 3 (5) directly or through the notch 33 at the end of the boss 29 (31). As a result, lubricating oil can be supplied between the inner peripheral side of the boss portion 29 (31) and the axle shaft 3 (5).
[Effect of Example 1]
In the present embodiment, the bearing support hole 25 (27) of the differential carrier 7 is formed along the outer race 39 of the tapered roller bearing 35 (37), and the accommodating space 15 of the differential carrier 7 and the taper. An oil passage 65 (67) communicating with the outer space 43 (45) of the roller bearing 35 (37) is provided. The oil passage 65 (67) is provided with a tongue 73 that extends downward from the outer race 39 of the tapered roller bearing 35 (37) and drops lubricating oil from the oil passage 65 (67). .

  Therefore, in this embodiment, the lubricating oil can be guided and dropped by the tongue 73 to the lower side of the outer race 39 of the tapered roller bearing 35 (37). As a result, the suction of the lubricating oil by the tapered roller bearing 35 (37) can be reliably suppressed, and the lubricating oil can be appropriately supplied via the outer space 43 (45).

  In particular, in this embodiment, the dropped lubricating oil adheres to the axle shaft 3 (5), and the axle shaft 3 (5) and the differential case 9 that penetrates and supports the axle shaft 3 (5) are provided. It is supplied between the boss 29 (31) and the inner periphery. Therefore, the lubricating performance of the boss portion 29 (31) can be improved.

  Further, since the boss portion 29 (31) is provided with a notch 33 penetrating between the inner and outer periphery, the lubricating oil can be reliably attached to the axle shafts 3 and 5 through the notch 33.

Since the tongue 73 overlaps the inner race 38 of the tapered roller bearing 35 (37) in the axial direction, the lubricating oil can be guided and dropped to the overlapping portion, more reliably. The suction of the lubricating oil by the tapered roller bearing 35 (37) can be suppressed.
In this embodiment, a circumferential shim 41 is sandwiched between the tapered roller bearing 35 (37) and the bearing support hole 25 (27) of the differential carrier 7 in the axial direction, and a tongue is attached to the inner periphery 77 of the shim 41. Since the portion 73 is provided, the lubricating structure according to the present invention can be easily and reliably realized, and can be easily applied to an existing differential device.

Further, since the tongue portion 73 is any one of the convex portions 79 provided in the circumferential direction on the inner periphery 77 of the shim 41, the lubricating oil can be reliably dropped.
[Modification]
FIG. 4 is a front view showing a shim of a lubricating structure according to a modification. Since the basic configuration of the shim according to this modification is the same as that of the shim 41 of the first embodiment, the corresponding components will be described with the same reference numerals or the same reference numerals with A.

  As shown in FIG. 4, the shim 41 </ b> A of the present modification includes an engaging portion 89 that engages with the oil passage 65 (67) to prevent rotation.

  In other words, an engaging portion 89 made of a convex portion extends toward the outer diameter side on the outer periphery 75A of the shim 41A. The engagement portion 89 is formed to have substantially the same circumferential dimension as the communication port 71 of the oil passage 65 (67), and is engaged with the oil passage 65 (67) in a non-rotating manner.

  A single tongue 73 </ b> A is provided on the inner periphery 77 </ b> A of the shim 41 </ b> A corresponding to the circumferential position of the engaging portion 89. The tongue portion 73A is longer in the circumferential direction than the convex portion 79 of the shim 41 of the first embodiment, and is formed substantially the same as the communication port 71 of the oil passage 65 (67).

  In the present modified example, in addition to the same effects as those of the first embodiment, the tongue 73A can be reliably disposed below the communication port 71 of the oil passage 65 (67) by the rotation prevention of the shim 41A. it can.

  FIG. 5 is a cross-sectional view of a main part of the differential device to which the lubricating structure for a rotating member according to Example 2 of the present invention is applied, and FIG. 6 is an explanatory diagram of a main part of the differential device of FIG. In this embodiment, since the basic configuration is the same as that of the above-described embodiment, the corresponding components are denoted by the same reference numerals or B, and detailed description thereof is omitted.

  As shown in FIGS. 5 and 6, the differential device 1 </ b> B according to the present embodiment has a lubrication structure tongue 73 </ b> B integrally provided on the differential carrier 7 </ b> B.

  That is, the tongue 73B extends from the opening edge of the communication port 71 of the oil passage 65 (67) to the inner diameter side. The tongue 73B faces the tapered roller bearing 35 (37) in the axial direction across the communication port 71 of the oil passage 65 (67), and the tip of the tongue 73B has a tapered roller bearing 35 (37). It overlaps with the inner race 38 in the axial direction.

  In the present embodiment, the lubricating oil guided to the outer space 43 (45) flows down from the communication port 71 of the oil passage 65 (67) to the inner peripheral side through the inner side surface 91 of the tongue 73B. Then, the lubricating oil is guided and dripped to a portion overlapping the inner race 38 of the tapered roller bearing 35 (37).

Therefore, also in the present embodiment, the same operational effects as those of the first embodiment can be obtained. In addition, the shim can be omitted to reduce the number of parts, and parts management and assembly work can be easily performed.
[Others]
As mentioned above, although the Example of this invention was described, this invention is not limited to this, A various change is possible.
For example, in the above embodiment, the lubrication structure is applied to the differential device. However, the transfer structure distributes the drive input to the front differential device to the rear wheel side, the coupling to intermittently drive the drive input to the rear wheel side, etc. Can also be applied.

  Further, as the differential mechanism portion of the differential device, for example, a device other than the bevel gear type can be used, and a differential limiting mechanism portion or a differential lock mechanism portion may be provided.

(Example 1) which is a side view which shows the differential apparatus to which the lubrication structure of a rotating member is applied. FIG. 2 is a main part sectional view of the differential apparatus of FIG. 1 as viewed in the direction of arrows II-II (Example 1). (Example 1) which is a front view which shows the shim used for the lubrication structure of a rotating member. It is a front view which shows the shim of the lubrication structure of a rotating member (modification example). (Example 2) which is principal part sectional drawing of the differential apparatus to which the lubrication structure of a rotating member is applied. (Example 2) which is principal part explanatory drawing of the differential apparatus of FIG.

Explanation of symbols

1 Differential device 3, 5 Axle shaft (output shaft)
7 Differential carrier (housing)
9 Differential case (rotating member)
15 Housing space 29, 31 Boss part 35 Taper roller bearing (bearing)
37 inner race 39 outer race 41 shim 43, 45 outer space 51 differential mechanism 73 tongue 79 convex 89 engagement portion

Claims (7)

A housing having a bearing support hole and containing lubricating oil in an internal accommodation space;
A rotating member disposed in the housing space and rotatably supported in the bearing support hole via a bearing;
In the bearing support hole, a lubricating structure for a rotating member provided with an oil passage formed along the outer race of the bearing and communicating the housing space and the outer space of the bearing,
Formed on the oil passage is a tongue that extends downward from the outer race of the bearing and drops the lubricating oil from the oil passage.
A lubrication structure for a rotating member. The lubricating structure for a rotating member according to claim 1,
The tongue overlaps the inner race of the bearing in the axial direction;
A lubrication structure for a rotating member. A lubricating structure for a rotating member according to claim 1 or 2,
Sandwiching a circumferential shim between the bearing and the bearing support hole in the axial direction;
The tongue is provided on the inner periphery of the shim,
A lubrication structure for a rotating member. A lubricating structure for a rotating member according to claim 3,
The tongue is any of a plurality of convex portions provided in the circumferential direction on the inner periphery of the shim.
A lubrication structure for a rotating member. A lubricating structure for a rotating member according to claim 3 or 4,
The shim includes an engaging portion that engages with the oil passage to prevent rotation.
A lubrication structure for a rotating member. A lubricating structure for a rotating member according to claim 1 or 2,
The convex portion is provided integrally with the housing,
A lubrication structure for a rotating member. A lubricating structure for a rotating member according to any one of claims 1 to 6,
The rotating member is a differential case in which a boss portion is rotatably supported by the bearing in the bearing support hole,
Provided with an output shaft that is penetrated and supported by the boss part and interlocked to the differential mechanism part of the differential case;
A lubrication structure for a rotating member.

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