JP2007285361A - Rotary shaft support structure and transfer device having this structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary shaft support structure allowing reduction in the size and cost, while enabling positioning in the axial direction of a bearing, without using a snap ring. <P>SOLUTION: A hole part 29 is formed in a front case 11 so as to form a cutout part 28 between an inner peripheral surface 14 and the hole part 29 of the case 11 over up to a side surface 18 of an outer race 13a of a bearing 13 from a side surface 19. An insertion pin A32 is inserted into the hole part 29 so that a part projecting to the inner peripheral side of the inner peripheral surface 14 from the cutout part 28, abuts on the side surface 18 of the outer race 13a, and a front case 11 and a center case 12a are joined in this state. Since a side surface 16 of the center case 12a covers an opening part 34 of the hole part 29, the bearing 13 is positioned and supported in the axial direction via the insertion pin A32 between an abutting surface 17 of the front case 11 and the side surface 16 of the center case 12a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to, for example, a rotary shaft support structure that rotatably supports a rotary shaft that transmits a driving force with respect to a case member, and a transfer device including the rotary shaft support structure, and more specifically, between the rotary shaft and the case member. The present invention relates to a rotating shaft support structure for positioning and supporting an interposed bearing in the axial direction, and a transfer device including the same.

  Generally, for example, in a transfer device that is mounted on a four-wheel drive type vehicle and distributes drive rotation via the transmission to the front and rear wheels, a bearing is interposed between the case and the rotation shaft. The rotating shaft is supported rotatably (see Patent Document 1). As a bearing for supporting such a rotating shaft, the outer race is in contact with and fitted to the case on one side in the axial direction, and the other side in the axial direction is positioned and supported with respect to the case by a snap ring. For example, the bearing is prevented from moving in the axial direction due to thrust force or vibration generated on the rotating shaft.

JP 11-348586 A

  However, if a snap ring is used to position the bearing as described above in the axial direction, it is necessary to provide a groove for fitting the snap ring on the inner peripheral surface of the hollow case, and this groove requires a certain degree of strength. Therefore, it is necessary to form the inner peripheral surface of the case so as to be longer than the axial width of the bearing. Further, since the snap ring is disposed beside the outer race of the bearing, it is the same as the axial thickness of the outer race of the bearing is increased. For example, a relatively rotating member such as a gear is removed from the bearing to some extent. Must be spaced apart. As described above, positioning and supporting the bearing using the snap ring is structurally long in the axial direction, and hinders compactization.

  Further, in order to provide a groove for fitting the snap ring, it is necessary to cut a substantially annular groove on the inner peripheral surface of the hollow case, and in particular, the outer shape of the case is a complicated shape like a transfer device. A special tool is required as a jig for the case, and a dedicated tool or the like for cutting the inner peripheral surface into an annular shape is required. For this reason, processing the groove of the snap ring also hinders cost reduction in manufacturing.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rotary shaft support structure capable of achieving compactness and cost reduction while being capable of positioning and supporting a bearing in the axial direction, and a transfer device including the same. It is what.

The present invention according to claim 1 (see, for example, FIGS. 1 to 5), a rotatable shaft-shaped member (for example, 7), and a hollow case member disposed on the outer peripheral side of the shaft-shaped member (for example, 7) (For example, 11), and a bearing (13) interposed between the inner peripheral surface (14) of the case member (for example, 11) and the outer peripheral surface (15) of the shaft-shaped member (for example, 7). In the rotating shaft support structure (S) for rotatably supporting the shaft-shaped member (for example, 7) with respect to the case member (for example, 11),
The case member (for example, 11) includes an abutting surface (17) on which a side surface (24) of one axial direction (X1 direction) of the outer race (13a) of the bearing (13) abuts, and the inner peripheral surface (14). ) From the axial end (19) of the case member (for example 11) to the axial direction (X1 direction) so as to form a cutout portion (28) that is partially cut away with respect to the axial direction (X1-X2 direction). And a hole (29) drilled in the
One end side in the axial direction (X2 direction) of the case member (for example, 11) so that the side surface (16) with respect to the axial direction (X1-X2 direction) covers at least a part of the opening (34) of the hole (29). A fixing member (for example, 12) fixed to
The outer race (13a) is inserted into the hole (29) and formed in a cross-sectional shape partially protruding from the notch (28) toward the inner peripheral side of the inner peripheral surface (14). A rod-shaped insertion member (having a length corresponding to the distance in the axial direction (X1-X2 direction) between the side surface (18) in the other direction (X2 direction) and the side surface (16) of the fixing member (for example, 12) ( 32b, 35)
By joining the case member (for example, 11) and the fixing member (for example, 12) in a state where the insertion member (32b, 35) is inserted into the hole (29), the notch (28) A part (32c, 35c) of the insertion member (32b, 35) protruding further contacts the other side surface (18) in the axial direction of the outer race (13a), and the bearing (13) is connected to the case member (for example, 11) and the side surface (16) of the fixing member (for example, 12) via the abutting surface (17) and the insertion member (32b, 35) are positioned and supported in the axial direction (X1-X2 direction). ,
The rotating shaft support structure (S) is characterized by this.

The present invention according to claim 2 (see, for example, FIG. 2), the case member (for example, 11) is the first case (11),
The fixing member (for example, 12) is a second case (12),
The first case (11) and the second case (12) are joined by a joining surface (38) perpendicular to the respective axial directions (X1-X2 directions), so that the shaft-like member (for example, 7) is rotatable. An integrated case (20) for supporting
By joining the first case (11) and the second case (12) with the insertion member (32b, 35) being inserted into the hole (29), the bearing (13) is In the axial direction (X1-X2 direction) by the contact surface (17) of the first case (11) and the joint surface (38) of the second case (12) via the insertion member (32b, 35). It is positioned and supported
It exists in the rotating shaft support structure (S) of Claim 1 characterized by the above-mentioned.

According to a third aspect of the present invention (see, for example, FIGS. 2 to 5), the hole (29) has a circular cross-section when drilled so that the inner peripheral surface (14) of the case member (11) is one. Drilled so that the notch (28) is formed by overlapping the part,
It exists in the rotating shaft support structure (S) of Claim 1 or 2 characterized by the above-mentioned.

According to a fourth aspect of the present invention (see, for example, FIGS. 2 to 5), the shaft center positioning means (10a, 10b) for positioning the shaft center position of the insertion member (32b, 35) in the hole (29) is provided. Prepared,
It exists in the rotating shaft support structure (S) of Claim 3 characterized by the above-mentioned.

In the present invention according to claim 5 (see, for example, FIG. 4), the shaft center positioning means (10a) includes a fitting hole (31) formed in a bottom portion (33) of the hole portion (29), and the insertion. A protrusion (32a) that is formed at the tip of the member (32b) and fits into the fitting hole (31).
It exists in the rotating shaft support structure (S) of Claim 4 characterized by the above-mentioned.

In the present invention according to claim 6 (see, for example, FIG. 5), the insertion member (35) has a through hole (35a) drilled in the axial direction (X1-X2 direction) in the inserted state. ,
The axial center positioning means (10b) includes a fitting hole (31) formed in the bottom (33) of the hole (29) with the same diameter as the through hole (35a), and the fitting hole (31). And a pin-like member (for example, 36) fitted together in the through hole (35a).
It exists in the rotating shaft support structure (S) of Claim 4 characterized by the above-mentioned.

In the present invention according to claim 7 (see, for example, FIG. 5), the pin-shaped member (for example, 36) is a spring pin (36).
It exists in the rotating shaft support structure (S) of Claim 6 characterized by the above-mentioned.

The present invention according to claim 8 (see, for example, FIGS. 1 and 2), a main body case (20) attached to a vehicle,
An input shaft (2) for inputting the output rotation of the transmission (10);
A first output shaft (3) disposed coaxially with the input shaft (2);
A sleeve shaft (7) rotatably disposed on the outer peripheral side of the input shaft (2);
A distribution mechanism (6) for distributing the rotation of the input shaft (2) to the first output shaft (3) and the sleeve shaft (7);
A second output shaft (4b) disposed on an axis parallel to the input shaft and transmitting the rotation of the sleeve shaft (7),
In the transfer device (1) for distributing the output rotation of the transmission to the front and rear wheels connected to the first and second output shafts (3 and 4b),
The body case (20) is formed by the case member (11) and the fixing member (12), and the sleeve shaft (7) is the shaft-shaped member (for example, 7). Comprising the rotating shaft support structure (S) described above,
The transfer device (1) is characterized in that.

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, this is for convenience for making an understanding of invention easy, and has no influence on the structure of a claim. It is not a thing.

  According to the first aspect of the present invention, a part of the insertion member protruding from the notch is in contact with the other side surface in the axial direction of the outer race, and the bearing is fixed to the fixing member via the contact surface of the case member and the insertion member. Since the bearing is positioned and supported with respect to the axial direction by the side surface, the space for providing the groove on the inner peripheral surface of the case member can be achieved while the bearing can be positioned and supported with respect to the axial direction without using a snap ring. It is possible to eliminate the need for securing, and the relative rotating member and the bearing can be brought close to each other, so that the structure can be made compact in the axial direction. Further, since it becomes unnecessary to process the groove of the snap ring, the manufacturing cost can be reduced.

  According to the second aspect of the present invention, the bearing is positioned and supported with respect to the axial direction by the contact surface of the first case and the side surface of the second case via the insertion member. The first case and the second case can be joined to form an integral case, and the bearing can be positioned and supported with respect to the axial direction at the same time without performing any special work for fixing to the bearing.

  According to the third aspect of the present invention, the hole is drilled so that the circular cross section when drilled overlaps a part of the inner peripheral surface of the first case so that a notch is formed. As compared with the case of processing the groove of the snap ring, it can be processed easily, and the cost can be reduced.

  According to the fourth aspect of the present invention, since the drill escapes in the direction of the notch when the hole is drilled, the hole is accurately drilled in the axial direction. Although it is difficult, since the shaft center positioning means for positioning the shaft center position of the insertion member in the hole portion is provided, the shaft center position of the insertion member can be accurately positioned without machining the hole portion with high accuracy. It is possible to position and support the bearing with high accuracy.

  According to the fifth aspect of the present invention, the shaft center positioning means includes a fitting hole formed at the bottom of the hole, a protrusion formed at the distal end portion of the insertion member, and fitted into the fitting hole. Therefore, the axial center position of the insertion member can be accurately positioned only by processing the fitting hole and the protrusion with high accuracy.

  According to the sixth aspect of the present invention, the shaft center positioning means includes a fitting hole formed at the bottom of the hole portion with the same diameter as the through hole, and a pin that fits together into the fitting hole and the through hole of the insertion member. Therefore, the axial center position of the insertion member can be accurately positioned only by processing the fitting hole and the through hole with high accuracy. Further, for example, as compared with a case where a projection with high accuracy is processed in the insertion member, it is only necessary to process the through hole in the insertion member with high accuracy, so that it can be easily processed.

  According to the seventh aspect of the present invention, since the pin-like member is a spring pin, when the spring pin is fitted into the fitting hole and the through hole, the pin is fitted in a contracted state, and the fitting is performed. By releasing in the combined state, the insertion member can be easily fixed to the fitting hole by the biasing force of the spring pin, and the axial center position of the insertion member can be positioned and supported easily.

  According to the present invention of claim 8, since the main body case is formed of a case member and a fixing member, and the sleeve shaft is a shaft-like member, the rotary shaft support structure according to any one of claims 1 to 7 is provided. It is possible to provide a transfer device that can support the positioning of the bearing in the axial direction and that can be made compact and cost-effective.

<First Embodiment>
A first embodiment according to the present invention will be described below with reference to FIGS.

  The transfer device 1 according to the present invention is mounted on, for example, an engine vertical four-wheel drive vehicle, and receives rotation output from the engine and shifted by a transmission (not shown), and is applied to front wheels and rear wheels. It is configured to output in a distributed form.

  As shown in FIG. 1, the transfer device 1 includes an input shaft 2, a gear mechanism (distribution mechanism) 6, a rear output shaft (first output shaft) 3, a sleeve shaft (shaft-shaped member) 7, a counter gear. A part 5 and a front output part 4 are provided, and these parts are housed in a case 20 (see FIG. 2) that is integrally formed by joining together. Further, in the transfer device 1, the input shaft 2, the gear mechanism 6, the rear output shaft 3, and the sleeve shaft 7 are coaxially arranged to constitute the first shaft CT 1, and the counter shaft 5 b of the counter gear portion 5 is the first one. A 2-axis CT2 is configured, and a front output shaft (second output shaft) 4b of the front output unit 4 is a third axis CT3. Of these three axes, the first axis CT1, the second axis CT2, and the third axis CT3, the second axis CT2 is disposed obliquely below the first axis CT1, and the third axis CT3 is the second axis CT2. It is arranged at a position opposite to the first axis CT1 and parallel to the second axis CT2, that is, it is arranged in a substantially letter shape in side view. The positional relationship between the first axis CT1, the second axis CT2, and the third axis CT3 should be set according to the mountability of the vehicle, and is not limited to this arrangement.

  The first shaft CT1 includes an input shaft 2, a gear mechanism 6, a rear output shaft 3, and a sleeve shaft 7 on the same axis. The input shaft 2 is connected to a transmission (not shown), and the rear output shaft 3 is not shown. Are connected to the rear left and right drive wheels via a rear propeller shaft and a rear differential gear (not shown). The sleeve shaft 7 is formed in a sleeve shape so as to cover the input shaft 2, and has a gear 7 a formed integrally.

  The second shaft CT2 includes a counter shaft 5b of the counter gear portion 5. The counter shaft 5b has a gear 5a formed integrally with the above-described gear 7a.

  The third shaft CT3 includes a front output shaft 4b of the front output unit 4, and the front output shaft 4b has a gear 4a formed integrally with the gear 5a described above. The front output shaft 4b is connected to the front left and right drive wheels via a front propeller shaft (not shown) and a front differential gear (not shown).

  The gear mechanism 6 is composed of a planetary gear, and includes a gear 6a connected to the sleeve shaft 7 as a sun gear, an internal gear 6d connected to the rear output shaft 3 as a ring gear, and a gear 6b as a pinion. A carrier 6c connected to the input shaft 2 and supporting the pinion 6b is provided. Further, the pinion 6b meshes with the sun gear 6a and the ring gear 6d, respectively.

  Next, the operation of the transfer device 1 according to the present invention will be described with reference to FIG.

  In the transfer device 1 according to the first embodiment, for example, output rotation output from the engine and shifted by the transmission is input to the input shaft 2. The rotation input to the input shaft 2 is transmitted to the gear mechanism 6, and the rotation transmitted to the gear mechanism 6 is transmitted from the carrier 6c to the rear output shaft 3 through the pinion 6b and the ring gear 6d. Further, it is transmitted from the carrier 6c to the sleeve shaft 7 through the pinion 6b and the sun gear 6a.

  In the normal state, the rotation to the ring gear 6d and the sun gear 6a is equally distributed according to the gear ratio of the sun gear 6a, the pinion 6b, and the ring gear 6d, and the resistance applied to each of the ring gear 6d and the sun gear 6a changes. When a differential occurs, the distribution ratio changes in such a manner that the differential rotation of the ring gear 6d and the sun gear 6a with respect to the pinion 6b is absorbed. Thereby, the rotation of the input shaft 2 is mechanically distributed to the sleeve shaft 7 and the rear output shaft 3.

  Thus, the rotation transmitted to the rear output shaft 3 is transmitted to the rear left and right drive wheels via a rear propeller shaft and a rear differential gear (not shown). The rotation transmitted to the sleeve shaft 7 is transmitted to the front output unit 4 via the counter gear unit 5, and a front propeller shaft and a front differential gear (not shown) are transmitted from the front output shaft 4 b of the front output unit 4. Is transmitted to the front left and right drive wheels. With the above operation, the drive rotation input to the transfer device 1 is transmitted to the front, rear, left and right drive wheels, and the four-wheel drive state is set.

  Next, the transfer device 1 according to the first embodiment of the present invention will be described with reference to FIGS. In addition, the longitudinal cross-sectional view of the transfer apparatus 1 shown in FIG. 2 is a cross-sectional view taken along the line BB indicated by a two-dot chain line in the cross-sectional view shown in FIG.

  As shown in FIG. 2, the transfer case 20 of the transfer device 1 includes a front case (case member, first case) 11 and a rear case (fixing member, second case) 12 including a center case 12a and an end case 12b. The front case 11, the center case 12a, and the end case 12b are fastened by bolts 25, 26 and the like to constitute an integrated case. The transfer case 20 has a generally hollow shape, and an input shaft 2, a rear output shaft 3, a gear mechanism 6, and a sleeve shaft 7 are rotatably accommodated in the hollow portion. The front case 11 and the center case 12a are joined by the side surface 19 of the front case 11 and the side surface 16 of the center case 12a to form a joint surface 38.

  In the hollow portion of the transfer case 20, the sleeve shaft 7 is supported with respect to the transfer case 20 by a bearing 13, which will be described in detail later, and a bearing 21 that is fitted to the center case 12 a and is positioned in the axial direction by the snap ring 22. It is supported rotatably. On the rear side (X2 direction side in FIG. 2) of the sleeve shaft 7, the sun gear 6a (see FIG. 1) of the gear mechanism 6 described above is integrally formed with respect to the rotational direction by, for example, spline engagement. Further, the above-described gear 7 a is formed in a portion between the bearing 13 and the bearing 21 of the sleeve shaft 7.

  The rear output shaft 3 is configured integrally with the ring gear 6d (see FIG. 1) of the gear mechanism 6 on the front side (X1 direction side in FIG. 2), and is freely rotatable by a bearing (not shown) in the end case 12b. In other words, it is supported rotatably with respect to the transfer case 20.

  The input shaft 2 is coaxially disposed in the hollow portion of the sleeve shaft 7 and is rotatably supported with respect to the transfer case 20 by a ball bearing 23 interposed between the input shaft 2 and the sleeve shaft 7. The input shaft 2 is formed so that the front side (X1 direction side in FIG. 2) can be splined to the output shaft of the transmission (not shown), and the rear side (X2 direction side in FIG. 2) is The carrier 6c (see FIG. 1) of the gear mechanism 6 is spline engaged with the carrier 6c so as to be integrated with the rotation direction. Further, the input shaft 2 is fitted so that the rear end (X2 direction side in FIG. 2) is rotatable with the rear output shaft 3 (not shown), and also rotates with the rear output shaft 3. It is supported freely. That is, the input shaft 2 is rotatably supported with respect to the transfer case 20 via the output shaft 3 and the sleeve shaft 7 (and the bearings 13, 21, 23 and the like that support them).

  On the other hand, in the counter gear portion 5 (not shown), the counter shaft 5b (see FIG. 1) forming the second shaft CT2 in the front case 11 is rotatable with respect to the front case 11 by bearings 39a and 39b. It is supported by. A gear 5a is integrally formed on the outer peripheral side between the bearings 39a and 39b of the counter shaft 5b and meshes with the gear 7a of the sleeve shaft 7 described above. It meshes with the gear 4a of the output shaft 4b (see FIG. 1).

  Next, the rotating shaft support structure S constituted by the sleeve shaft 7, the bearing 13, and the transfer case 20 that are the main parts of the present invention will be described in detail.

  In the bearing 13, the outer peripheral surface of the outer race 13 a is in contact with the inner peripheral surface 14 of the front case 11, and the side surface 24 on the front side (X1 direction side in FIG. 2) is in contact with the contact surface 17 of the front case 11. The sleeve shaft 7 is rotatably supported with respect to the front case 11 by fitting and supporting the outer peripheral surface 15 of the sleeve shaft 7 by the roller 13b. Thereby, the bearing 13 and the sleeve shaft 7 are positioned with respect to the radial direction, and the bearing 13 is disposed so as to be immovable with respect to the front direction.

  On the other hand, as shown in FIG. 2, the front case 11 has a rear side (X2 direction side in FIG. 2) of the outer race 13a of the bearing 13 from the side surface 19 on the rear side (X2 direction side in FIG. 2) toward the front side. ) Is formed in a cylindrical concave shape over the side surface 18, and an opening 34 is formed in the side surface 19. As shown in FIG. 3, the hole portion 29 is formed so that its diameter (a part of the radial cross section) overlaps with the outer race 13 a, and for this reason, a part of the inner peripheral surface 14 of the front case 11. A notch 28 is formed along the hole 29.

  The hole portion 29 has a length from the side surface 18 on the rear side (X2 direction side in FIG. 2) of the outer race 13a to the side surface 19 of the front case 11, and is smaller than the hole portion 29 and has a diameter smaller than that of the outer race 13a. An insertion pin A32 composed of a cylindrical portion (insertion member) 32b formed in a cylindrical shape and a protrusion 32a formed at the tip of the cylindrical portion 32b is inserted so as to overlap. The cylindrical portion 32b is formed to have an outer diameter that protrudes to the inner peripheral side from the inner peripheral surface 14 at the notch portion 28, that is, on the front side (X1 direction side in FIG. 2) of the cylindrical portion 32b. The part which protruded from the notch part 28 in the side surface is formed so that it may become the contact part (a part of insertion member) 32c contact | abutted with the side surface 18 of the outer race 13a.

  The front case 11, the center case 12a, and the end case 12b are joined with the insertion pin A32 having the cylindrical portion 32b inserted as described above, and fastened with bolts 25, 26, etc. The side surface 16 of the case 12a covers the opening portion 34, and the cylindrical portion 32b cannot move rearward (X2 direction side in FIG. 2). As a result, the bearing 13 is positioned and supported in the axial direction between the contact surface 17 of the front case 11 and the side surface 16 of the center case 12a via the cylindrical portion 32b.

  By the way, as shown in FIG. 4, the hole 29 is cut by drilling, but the drill escapes in the direction of the notch 28 at the time of machining, so that the inner surface of the hole 29 has escaped. Because it curves in the direction, it is difficult to form it parallel to the axial direction. That is, it is difficult to machine the hole 29 with high precision in the axial direction and horizontally, and in order to machine the hole 29 with high precision into a hole parallel to the axial direction, for example, work such as repeated machining is required. This is necessary and hinders cost reduction. On the other hand, it is also difficult to manufacture the insertion pin A32 that does not accurately process the hole 29 and can be fitted into the curved hole 29 as described above.

  Therefore, the straight insertion pin A32 that can be inserted into the curved hole 29 as described above inevitably requires the outer diameter of the cross section of the cylindrical portion 32b to be smaller than the inner diameter of the hole 29. However, reducing the outer diameter of the cylindrical portion 32 b has a problem that a gap (backlash) is generated between the cylindrical portion 32 b and the hole portion 29. Needless to say, such backlash causes problems such as noise and wear.

  Therefore, in the present embodiment, a predetermined length is provided at a position where the inner diameter is smaller than the inner diameter of the hole 29 from the bottom 33 of the hole 29 to the front side (X1 direction side in FIG. 2) and does not interfere with the outer race 13a. As described above, the insertion hole A32 is formed with the projection 32a that can be fitted into the fitting hole 31, and the fitting hole 31 and the projection 32a are formed. The axial center positioning mechanism 10a is comprised by this.

  As described above, the shaft center positioning mechanism 10a can process the fitting hole 31 and the protrusion 32a with high accuracy even if a gap is generated between the hole 29 and the cylindrical portion 32b of the insertion pin A32. The axial center position of the insertion pin A32 can be accurately positioned. As a result, even if there is a gap between the hole 29 and the cylindrical portion 32b of the insertion pin A32, it is possible to prevent rattling, and conversely, the hole 29 can be processed with high accuracy. It becomes possible to make it unnecessary.

  As described above, according to the transfer device 1 according to the present invention, a part of the insertion pin A32 protruding from the notch 28 abuts on the side surface 18 in the X2 direction of the outer race 13a, and the bearing 13 abuts the abutment surface of the front case 11. 17 and the side surface 16 of the center case 12a through the insertion pin A32, the bearing 13 can be positioned and supported in the axial direction without using a snap ring. However, it is not necessary to secure a space for providing a groove in the inner peripheral surface 14 of the front case 11, and the gear 7a and the bearing 13 can be brought close to each other, so that the structure can be made compact in the axial direction. be able to. Further, since it becomes unnecessary to process the groove of the snap ring, the manufacturing cost can be reduced.

  Further, since the bearing 13 is positioned and supported in the axial direction by the contact surface 17 of the front case 11 and the side surface 16 of the center case 12a via the insertion pin A32, particularly the insertion pin A32 is fixed to the front case 11. Without any special work, the front case 11 and the center case 12a are joined to form an integrated case, and at the same time, the bearing 13 can be positioned and supported in the axial direction.

  Further, since the hole 29 is drilled so that the circular cross section when drilled overlaps a part of the inner peripheral surface 14 of the front case 11, the notch 28 is formed, so that the groove of the snap ring As compared with the case of processing, it can be processed easily, and the cost can be reduced.

  Further, since the drill escapes in the direction of the notch 28 as the notch 28 is formed when the hole 29 is drilled, it is difficult to accurately drill the hole 29 in the axial direction. Since the shaft center positioning mechanism 10a for positioning the shaft center position of the insertion pin A32 in the hole 29 is provided, the shaft center position of the insertion pin A32 can be accurately positioned without machining the hole 29 with high accuracy. The bearing 13 can be positioned and supported with high accuracy.

  Further, the shaft center positioning mechanism 10a includes a fitting hole 31 formed in the bottom 33 of the hole 29, and a protrusion 32a formed in the distal end portion of the insertion pin A32 and fitted in the fitting hole 31. Therefore, the axial center position of the insertion pin A32 can be accurately positioned only by processing the fitting hole 31 and the protrusion 32a with high accuracy.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, except for some changes, the same reference numerals are given to the same parts as those in the above embodiment, and the description thereof is omitted.

  The transfer device 1 according to the second embodiment is obtained by changing the shapes of the shaft center positioning mechanism 10a and the insertion pin A32 as compared with the first embodiment. That is, as shown in FIG. 5, an insertion pin B (insertion member) 35 having a through hole 35a and a spring pin 36 are used instead of the insertion pin A32.

  As in the first embodiment, the hole 29 has a length from the side surface 18 on the rear side (X2 direction side in FIG. 2) of the outer race 13a to the side surface 19 of the front case 11, and the hole 29 An insertion pin B35, which is smaller and has a diameter protruding from the notch 28, is inserted. The side surface 18 of the outer race 13a is disposed on the front side (X1 direction side in FIG. 2) of the insertion pin B35. A contact portion 35c that comes into contact with. The through hole 35a is formed to have substantially the same diameter as the fitting hole 31, and a spring pin 36 is inserted so as to fit both the through hole 35a and the fitting hole 31. .

  When the spring pin 36 is fitted into the fitting hole 31 and the through hole 35a, the spring pin 36 is inserted into the fitting hole 31 and the through hole 35a in a state where the spring is contracted in the inner diameter direction. By releasing the spring of the spring pin 36 at the fitting position, the urging force fixes the insertion pin B35 to the fitting hole 31. Thus, the shaft center positioning mechanism 10b is constituted by the fitting hole 31, the spring pin 36, and the portion of the through hole 35a where the spring pin 36 is fitted.

  As described above, according to the transfer device 1 according to the second embodiment, the shaft center positioning mechanism 10b includes the fitting hole 31 formed in the bottom 33 of the hole 29 with the same diameter as the through hole 35a, and the fitting. Since the joint hole 31 and the pin-like member that fits together in the through hole 35a of the insertion pin B35 are included, the axial center position of the insertion pin B35 can be adjusted by simply machining the fitting hole 31 and the through hole 35a. Positioning can be performed with high accuracy. Further, for example, as compared with the case where the projection 32a with high accuracy is processed on the insertion pin A32, the through hole 35a is simply processed with high accuracy on the insertion pin B35, so that it can be easily processed.

  Further, since the pin-shaped member is the spring pin 36, when the spring pin 36 is fitted into the fitting hole 31 and the through hole 35a, the pin is fitted in a contracted state, and in the fitted state. By releasing, the insertion pin B35 can be easily fixed to the fitting hole 31 by the urging force of the spring pin 36, and the axial center position of the insertion pin B35 can be easily and accurately positioned and supported.

  In the second embodiment, the other configurations, operations, and effects are the same as those in the first embodiment, and thus description thereof is omitted.

  In addition, although the rotating shaft support structure S which concerns on 1st and 2nd embodiment demonstrated above was demonstrated as what was provided in the transfer apparatus 1, the rotating shaft support structure S is a case in which a rotating shaft is a bearing. As long as it is supported rotatably, it may be provided in any device such as a differential device or an automatic transmission, and in particular, in a case where a split case is joined to form an integral case. This is effective for a structure in which the insertion member can be inserted into the bearing from the joint surface between the cases.

  In the first and second embodiments, the transfer device 1 has been described for the case where the fixing member is the center case 12a. However, the present invention is not limited to this, and any transfer device 1 may be used. Any shape may be used as long as it covers at least a part of the opening portion 34 so that the insertion member cannot be moved in the axial direction.

  Further, in the first and second embodiments, the shaft center positioning means has been described as being configured with a protrusion and a fitting hole, or a spring pin, a through hole, and a fitting hole. Anything that can position the axis of the insertion member is within the scope of the present invention. In particular, the axial center positioning means has been described for positioning the axial center position of the insertion member with respect to the front case 11, but for example, the axial center position of the insertion member is positioned with respect to the fixed member (center case 12a). It doesn't matter if you do.

  In the second embodiment, the spring pin 36 is used as the pin-shaped member. However, the pin may not be a spring pin and can be fitted into the fitting hole 31 and the through hole 35a. A simple pin-shaped member may be used.

  In the first and second embodiments, the gear mechanism 6 has been described as a planetary gear. However, the drive rotation input from the input shaft 2 such as a Torsen gear can be distributed to the rear output shaft 3 and the sleeve shaft 7. Anything can be used.

The skeleton figure which shows the transfer apparatus which concerns on the 1st Embodiment of this invention. The cross-sectional view which shows a part of transfer apparatus. The longitudinal cross-sectional view which shows a part of transfer apparatus. AA arrow sectional drawing of FIG. The AA arrow directional cross-sectional view of FIG. 3 which concerns on 2nd Embodiment.

Explanation of symbols

1 Transfer device 2 Input shaft 3 First output shaft (rear output shaft)
4b Second output shaft (front output shaft)
6 Distribution mechanism (gear mechanism)
7 Shaft-shaped member, sleeve shaft 10a, 10b Axial positioning mechanism (axial positioning means)
11 Case member (first case, front case)
12 Rear case (fixing member, second case)
13 Bearing 13a Outer race 14 Inner peripheral surface 15 Outer peripheral surface 16 Side surface 17 (of the fixing member) Abutting surface 18 Side surface 19 of the outer race (on the X2 direction side) Side surface 19 (of the case member) Case 24 (X1 direction of the outer race) Side) 28 notch 29 hole 31 fitting hole 32a protrusion 32b insertion member (cylindrical part)
32c, 35c Part of the insertion member (contact portion)
33 Bottom 34 Opening portion 35 Insertion member (insertion pin B)
35a Through hole 36 Pin-shaped member, spring pin 38 Joint surface S Rotating shaft support structure X1-X2 Axial direction

Claims (8)

A rotatable shaft-shaped member, a hollow case member disposed on the outer peripheral side of the shaft-shaped member, and a bearing interposed between the inner peripheral surface of the case member and the outer peripheral surface of the shaft-shaped member; In a rotating shaft support structure that rotatably supports the shaft member with respect to the case member,
The case member forms a contact surface with which one side surface in the axial direction of the outer race of the bearing contacts, and a cutout portion in which a part of the inner peripheral surface is cut out with respect to the axial direction. A hole portion drilled in the axial direction from one axial end of the
A fixing member fixed to one end side in the axial direction of the case member so that a side surface with respect to the axial direction covers at least a part of the opening portion of the hole portion;
It is inserted into the hole and formed in a cross-sectional shape in which a part protrudes from the notch to the inner peripheral side of the inner peripheral surface, and the other side surface in the axial direction of the outer race and the side surface of the fixing member A rod-shaped insertion member formed to a length corresponding to the axial distance,
The case member and the fixing member are joined in a state where the insertion member is inserted into the hole portion, so that a part of the insertion member protruding from the notch portion is the other side surface in the axial direction of the outer race. The bearing is positioned and supported with respect to the axial direction by the contact surface of the case member and the side surface of the fixing member via the insertion member.
A rotating shaft support structure characterized by that. The case member is a first case;
The fixing member is a second case;
The first case and the second case are joined by joint surfaces perpendicular to the respective axial directions to constitute an integral case that rotatably supports the shaft-like member,
The first case and the second case are joined in a state where the insertion member is inserted into the hole, so that the bearing is inserted into the first case via the contact surface of the first case and the insertion member. It is positioned and supported with respect to the axial direction by the joint surface of the two cases.
The rotating shaft support structure according to claim 1. The hole portion is drilled so that the cutout portion is formed by overlapping a circular cross section when drilled with a part of the inner peripheral surface of the case member.
The rotating shaft support structure according to claim 1 or 2, wherein Comprising an axial center positioning means for positioning the axial position of the insertion member in the hole,
The rotating shaft support structure according to claim 3. The shaft center positioning means includes a fitting hole formed in a bottom portion of the hole portion, and a protrusion formed in a tip portion of the insertion member and fitted in the fitting hole.
The rotating shaft support structure according to claim 4. The insertion member has a through hole formed in the axial direction in the inserted state,
The shaft center positioning means includes a fitting hole formed at the bottom of the hole portion with the same diameter as the through hole, and a pin-like member that fits together in the fitting hole and the through hole.
The rotating shaft support structure according to claim 4. The pin-shaped member is a spring pin.
The rotating shaft support structure according to claim 6. A body case attached to the vehicle;
An input shaft for inputting the output rotation of the transmission;
A first output shaft disposed coaxially with the input shaft;
A sleeve shaft rotatably disposed on the outer peripheral side of the input shaft;
A distribution mechanism for distributing the rotation of the input shaft to the first output shaft and the sleeve shaft;
A second output shaft disposed on an axis parallel to the input shaft and transmitting the rotation of the sleeve shaft;
In the transfer device for distributing the output rotation of the transmission to the front and rear wheels connected to the first and second output shafts,
The main body case is formed of the case member and the fixing member, and the sleeve shaft is used as the shaft-like member, and the rotary shaft support structure according to any one of claims 1 to 7 is provided.
A transfer device characterized by that.

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