JP2008045593A - Pinion shaft supporting device and pinion unit bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pinion shaft supporting device having a fixing structure for allowing easy alignment of a bolt hole in a flange portion of a pinion unit bearing with a corresponding screw groove of a housing case. <P>SOLUTION: The pinion shaft supporting device comprises the pinion unit bearing 20 inserted and fixed into the housing case 30 and having an inner ring and an outer ring 21 for supporting a pinion shaft. Around the outer ring 21, the plurality of flange portions 25 are provided with bolt holes 26 via which the bearing 20 inserted into the housing case 30 is fastened and fixed to the case 30. Each flange portion 25 is formed in a tapered shape gradually narrower as tending to the direction of insertion into the housing case 30. The housing case 30 has a plurality of flange portion receiving recessed portions 32 around an insertion port of the bearing 20 for receiving the flange portions 25. In each recessed portion, the screw groove 33 is formed corresponding to the bolt hole 26. Each recessed portion 32 is formed in a tapered shape fittable to the flange portion 25. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pinion unit bearing that rotatably supports a pinion shaft of a vehicle pinion shaft support device such as a differential gear or a transaxle of an automobile, and a vehicle pinion shaft support device including the pinion unit bearing.

  The pinion unit bearing that supports the pinion shaft to which a relatively large radial load and thrust load are applied has a structure as shown in the front view of FIG. 3A and the side view of FIG. 3B, for example. In the interior, usually, a configuration is adopted in which tapered rollers 4 are arranged in double rows between the outer ring 2 and the inner ring 3 with a predetermined distance in the axial direction of the pinion shaft.

Such a pinion unit bearing 1 is inserted into a housing case 10 of a differential device as shown in FIG. A bolt is passed through a thread groove formed in the case 10 and fixed to the housing case 10 (see, for example, Patent Document 1).
JP 2001-336603 A

  As described above, the pinion unit bearing 1 incorporated in the differential device is bolted to the housing case 10 by the flange portion 5 of the outer ring 2 so as not to come out when an axial load is applied. For this reason, when the pinion unit bearing 1 is inserted into the housing case 10, the phases of the bolt holes 6 of the flange portion 5 and the thread grooves of the housing case 10 must be matched.

  However, it is not an easy task to make the phase of the bolt hole of the flange formed in the outer ring coincide with the screw groove of the housing case. This is especially true when the outer ring outer surface of the pinion unit bearing and the inner peripheral surface of the housing case are tightly fitted (no looseness) in order to improve the positional accuracy of the gear teeth when assembled. is there.

  The present invention has been made to cope with the above-described problems. When the pinion unit bearing is mounted on the housing case, the positioning of the bolt hole of the flange portion of the pinion unit bearing and the corresponding screw groove of the housing case ( The present invention proposes a pinion shaft support device having a fixed structure capable of easily adjusting the phase. A pinion unit bearing for this purpose is also proposed.

  The pinion shaft support device of the present invention is a pinion shaft support device in which a pinion unit bearing having an inner ring and an outer ring, which supports the pinion shaft, is inserted and fixed in a housing case, and the bearing includes the housing. A plurality of flange portions having bolt holes for tightening and fixing to the case are provided around the outer ring, and the flange portion has a tapered shape that narrows in the direction of insertion into the housing case. The housing case includes a plurality of recesses for receiving the flange portions around the insertion opening of the bearing, and each recess has a thread groove corresponding to the bolt hole, and each recess fits with the flange portion. Tapered shape.

  The pinion unit bearing of the present invention is a pinion unit bearing having an inner ring and an outer ring that is inserted and fixed in a housing case and supports a pinion shaft, and is provided with a bolt hole that is used for tightening and fixing to the housing case. A plurality of flange portions having a plurality of flange portions are provided around the outer ring, and the flange portions have a tapered shape that narrows in the direction of insertion into the housing case, and are fitted into the flange portion receiving recesses of the housing case. It has become.

  In the present invention, the pinion unit bearing includes a plurality of flange portions around the outer ring having bolt holes for tightening and fixing to the housing case, and the flange portions are tapered toward the insertion direction into the housing case. Since it is shaped and fits into the flange receiving recess of the housing case, when the pinion unit bearing is inserted into the housing case and mounted, the narrow end of the flange portion is attached to the housing. It can easily be positioned in the flange receiving recess of the case, and after that, just by pushing the pinion unit bearing into the housing case, alignment of the bolt hole and the screw groove (phase phase) (Adjustment) can be performed automatically.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a front view (a) and a plan view (b) of a pinion unit bearing according to an embodiment of the present invention, and FIG. 2 is a pinion constituting a differential device as a pinion shaft support device according to an embodiment of the present invention. It is a figure explaining the fixing method of a unit bearing and a housing case.

A pinion unit bearing 20 shown in FIGS. 1 and 2 has an outer ring 21 and an inner ring 22, and tapered rollers 23 are arranged between the outer ring 21 and the inner ring 22 in a double row. The hole passing through the central portion of the pinion unit bearing 20 is a pinion shaft through hole 24 through which a pinion shaft (not shown) passes.
Around the one end in the width direction of the outer ring 21, a flange portion 25 having a bolt hole 26 used for fixing to the housing case 30 is formed in a state protruding from the other outer diameter portion of the outer ring 21. The thickness direction of each flange portion 25 is formed in a tapered shape that narrows in the direction of insertion into the housing case 30. In FIG. 1B, FIG. 2A, and FIG. 2B, a hatched line 25a represents the tapered end surface of the flange portion 25.

  Further, a part of the outer ring 21 on the flange part 25 side (the convex part 27) is formed to have a larger diameter than the other width direction part of the outer ring 21, and the convex part 27 is tight with the inner peripheral surface of the housing case 30 Is fitted. Thereby, the centering accuracy of the pinion unit bearing 20 assembled to the housing case 30 is improved.

  The housing case 30 has a cylindrical space into which the pinion unit bearing 20 is inserted, and a flange locking portion 31 that locks the flange portion 25 of the pinion unit bearing 20 is provided on the bearing insertion port side. . In the flange locking portion 31, flange portion receiving recesses 32 for receiving the flange portions 25 are formed by the number of the flange portions 25. A thread groove 33 corresponding to the bolt hole 26 of the flange portion 25 is formed in the concave portion 22. Moreover, each recessed part 32 becomes a taper shape in which the recessed part opening side is wide and the recessed part back side is narrow so that the flange part 25 may be fitted. 2A and 2B, the slanted line 32a represents the tapered wall surface of the flange receiving recess 32. FIG.

  Next, an example of a method for mounting (attaching) the pinion unit bearing 20 to the housing case 30 will be described with reference to FIG. The pinion unit bearing 20 is inserted from the insertion port on the side where the flange locking portion 31 of the housing case 30 is located, with the side opposite to the side where the flange portion 25 is located (FIG. 2A).

First, the pinion unit bearing 20 is inserted into the housing case 30 up to the front of the convex portion 27 formed on the outer diameter surface of the outer ring 21. In this process, since the fitting between the outer diameter surface of the outer ring 21 and the inner peripheral surface of the housing case 30 is loose, the insertion of the pinion unit bearing 20 is easy. Next, after adjusting the position (phase) of the pinion unit bearing 20 so that the narrow end portion of the flange portion 30 enters the opening of the flange portion receiving recess 32, the pinion unit bearing 20 is press-fitted into the housing case 30, The convex portion 27 on the outer peripheral surface of the outer ring 21 and the inner peripheral surface of the housing case 30 are tightly fitted (FIG. 2B).
Although not shown, the bolt is then passed from the bolt hole 26 through the thread groove 33, the flange portion 25 is fastened to the housing case 30, and the pinion unit bearing 20 is permanently fixed to the housing case 30.

  As described above, according to the differential device of the present embodiment, the pinion unit can be obtained by simply inserting (or press-fitting) the narrow width portion of the flange portion 25 into the widened opening of the flange receiving concave portion 32 at the time of assembly. The bolt hole 24 of the bearing 20 and the screw groove 33 of the housing case 30 are easily positioned using the taper shape of each other.

In the above embodiment, the convex portion 27 of the outer ring 21 of the pinion unit bearing 20 is tightly fitted to the inner peripheral surface of the housing case 30. However, in the present invention, the outer peripheral surface of the outer ring 21 is not necessarily the housing. There is no need to tightly fit the case 30.
Further, instead of tightly fitting the outer peripheral surface of the outer ring 21 to the housing case 30, the fitting between the flange portion 25 and the flange receiving recess 32 may be tight.

Furthermore, in the said embodiment, although the pinion unit bearing 20 was comprised using the tapered roller bearing 23, you may replace it with other bearings, such as a ball bearing, for the pinion unit bearing of this invention.
Moreover, although the differential apparatus was shown as a pinion shaft support apparatus, you may use as other pinion shaft support apparatuses for vehicles, such as a transaxle.

The front view and top view (b) of the pinion unit bearing which concern on embodiment. The figure explaining the pinion unit bearing which comprises the differential apparatus which concerns on embodiment, and the fixing method of a housing case. The front view (a) and side view (b) of the conventional pinion unit bearing. The figure explaining the conventional fixing method of a pinion unit bearing and a housing case.

Explanation of symbols

20 pinion unit bearing, 21 outer ring, 22 inner ring, 23 tapered roller, 24 pinion shaft through hole, 25 flange part, 25a taper end face of flange part, 26 bolt hole, 27 convex part, 30 housing case, 31 flange locking part, 32 Flange part receiving recessed part, 32a Tapered wall surface of recessed part, 33 Screw groove.

Claims (2)

A pinion shaft support device in which a pinion unit bearing having an inner ring and an outer ring for supporting a pinion shaft is inserted and fixed in a housing case,
The bearing is provided with a plurality of flange portions having bolt holes for fastening and fixing to the housing case around the outer ring, and the flange portions are directed toward the insertion direction into the housing case. It has a tapered shape that narrows,
The housing case includes a plurality of recesses for receiving the flange portions around the insertion opening of the bearing, and each recess has a thread groove corresponding to the bolt hole, and each recess fits with the flange portion. A pinion shaft support device having a tapered shape. A pinion unit bearing having an inner ring and an outer ring, which is inserted and fixed in a housing case and supports a pinion shaft,
A plurality of flange portions having bolt holes for tightening and fixing to the housing case are provided around the outer ring, and the flange portions have a tapered shape that narrows in the direction of insertion into the housing case; and A pinion unit bearing having a shape that fits into a flange receiving recess of the housing case.

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