JP4054962B2 - Rolling bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling bearing device, and more particularly to a rolling bearing device using a rolling bearing with a small frictional torque, such as a ball bearing, in a power transmission mechanism in which not only a radial load but also a thrust load is applied.
[0002]
[Prior art]
Rolling bearings mounted on the shafts of automobile differential gear devices and countershafts of power transmission devices that extract the power from the engine and transmit the rotational torque to the rotating shaft are subject to a considerable thrust load along with the radial load. Roller bearings are used. For example, FIG. 4 shows an example of a power transmission device that transmits power, but the gears 10, 11, and 12 are fitted and fixed to the countershaft 1 and are separately provided through gears provided on separately arranged shafts (not shown). Rotational torque is transmitted to the shaft. In the power transmission device in this case, tapered roller bearings 13 and 14 are arranged between the housing case 2 and the countershaft 1 and assembled by applying preload.
[0003]
As described above, in the power transmission device, the gear 10 and the like are fixed to the countershaft 1 in the housing case 2 and assembled in order. However, if the entire length is long, a cumulative error occurs, so shim adjustment is necessary. The shim adjustment is performed by incorporating the shim 6 between the housing case 2 and the tapered roller bearing 13. The shim 6 is an annular metal ring, which has various thicknesses and adjusts the gap in the axial direction. Therefore, when adjusting the shim, the best one is selected each time centering is performed. It will be. In the case of a tapered roller bearing, as shown in FIG. 5, the inner ring 13a and the tapered roller 13c cannot be removed because they are combined as one combined body by a cage 13d. However, the outer ring 13b is different from these. Separable. Accordingly, when adjusting the shim, the shim 6 may be placed between the housing case 2 and the outer ring 13b.
[0004]
[Problems to be solved by the invention]
In recent years, there has been a demand for a power transmission device with high transmission efficiency that suppresses generation of carbon dioxide (CO ₂ ) and the like as much as possible from the viewpoint of preventing global warming even in automobiles and the like. Tapered roller bearings have a large load capacity for both radial and thrust loads, but generally such tapered bearings are disadvantageous from the standpoint of reducing carbon dioxide emissions due to their high friction torque. . Therefore, in the power transmission mechanism, it is required to use a rolling bearing having a small friction torque such as a ball bearing without using such a tapered roller bearing having a relatively large friction torque.
[0005]
However, when a rolling bearing such as a ball bearing is used, there is a problem that shim centering adjustment (centering) cannot be performed. That is, as described above, in the case of a tapered roller bearing in the power transmission device, the inner ring 13a and 13c can be incorporated into the countershaft as a combined body by the retainer 13d, and the outer ring 13b can be separated as a separate body. Can be performed very easily because it can be performed between the housing case 2 and the outer ring 13b. On the other hand, in the case of a rolling bearing such as a ball bearing, the inner ring, outer ring, rolling element (ball), and cage cannot be separated, so even if a shim is placed between the housing case and the rolling bearing, the shim is not stable. Cannot be adjusted.
[0006]
The present invention has been made to cope with the above-described problems, and is a rolling bearing device that can easily adjust shim centering even when a rolling bearing such as a ball bearing is used as a power transmission device. The purpose is to provide.
[0007]
[Means for Solving the Problems]
That is, in order to solve the above-described problems, the present invention described in claim 1 includes a rolling bearing constituted by an inner ring and an outer ring, a rolling element held by a cage, and a hermetic seal, and the rolling bearing. A rolling bearing device comprising: a housing case in which a bearing is disposed; and an adjustment shim disposed between the rolling bearing; and an outer ring of the rolling bearing in which the shim is placed on an axial end surface of the seal seal. of the end face bulging portion is formed axially outward tare is, by the bulging portion, and is characterized in that the movement of the shim is limited.
[0008]
The invention according to claim 2 is characterized in that the rolling bearing is a ball bearing.
[0009]
The rolling bearing device according to the present invention employs the above-described means, so that when the rolling bearing 3 that cannot separate the inner ring and the outer ring is incorporated in the power transmission device, the bulging portion 5c that protrudes outward in the axial direction of the seal seal 5 is because it is formed as to protrude from the end face of the outer ring 3b placing shim 6, a shim 6 which is placed on the end face of the outer ring 3b shall be locked to the bulging portion 5c of the sealing seal 5 become. For this reason, the shim 6 can be installed in a stable state without dropping. Therefore, shim adjustment can be performed (see FIGS. 3A and 3B).
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a simplified longitudinal sectional view of a rolling bearing device according to the present invention, and FIG. 2 is an enlarged view of a portion P in FIG. In addition, in order to avoid duplication, it demonstrates using the same code | symbol as the code | symbol demonstrated by the prior art for the same component.
This rolling bearing device is used in a power transmission device. The power transmission device includes gears 10, 11, 12 fitted and fixed to a countershaft 1, and a gear provided on a separately arranged shaft (not shown). Rotational torque is transmitted to a separate shaft through In the power transmission device in this case, rolling bearings 3 and 4 are arranged between the countershaft 1 and the housing case 2 as a rolling bearing device and assembled by applying preload.
[0011]
This rolling bearing device includes a rolling bearing 3 composed of an inner ring 3a, an outer ring 3b, a rolling element 3c held by a cage 3d, and a sealing seal 5, and a housing case 2 in which the rolling bearing 3 is disposed. , And an annular shim 6 for adjustment disposed between the rolling bearings 3. In this case, the sealing seal 5 is composed of a cored bar 5a and an elastic material 5b such as rubber. The shim 6 is placed on the axial end surface of the elastic material 5b, that is, the inner diameter portion (inner side surface) of the shim 6 is provided. A bulging portion 5c that protrudes outward in the axial direction from the end surface of the abutting outer ring 3b is formed. That is, even if the shim 6 placed on the end face of the outer ring 3b moves somewhat, it is locked to the bulging portion 5c of the seal seal 5 so that it stays and does not fall (FIG. 3B). reference). The other rolling bearing 4 shown in FIG. 1 does not require centering adjustment and therefore will not be described in detail, but the sealing seal 5 is omitted. The hermetic seal of this part may be a normal one.
[0012]
FIG. 3A is a longitudinal sectional view showing a state of centering adjustment when the rolling bearing device of the present invention is incorporated in a power transmission device. First, the rolling bearing 3 is fitted and fixed to the countershaft 1 fitted and fixed, such as a gear. Then, a shim 6 having an appropriate thickness is placed on the end face of the outer ring 3b of the rolling bearing 3 (the shaft 1 is erected so that the bearing 3 is on the upper side) , and the step 2a of the housing case 2 is covered with the housing 2 from above. The rolling bearing 3 is incorporated so as to be fitted in and adjusted. In this case, the shim 6 placed on the end surface of the outer ring 3b of the rolling bearing 3 may move for some reason. However, the bulging portion 5c protruding outward in the axial direction of the elastic member 5b such as rubber of the seal seal 5 is formed so as to protrude from the end face of the outer ring 3b on which the shim 6 is placed. As shown in FIG. 3 (B), the shim 6 placed on the end surface of the outer ring 3b is locked to the bulging portion 5c of the sealing seal 5, so that the shim 6 should be installed in a stable state without dropping. Is possible.
[0013]
The rolling bearing 3 is used in place of a tapered roller bearing conventionally used in a power transmission device. Therefore, it is necessary to provide a rolling bearing having a load capacity capable of withstanding not only a radial load but also a considerable thrust load and a small friction torque. Therefore, as the rolling bearing 3, for example, a deep groove ball bearing or a single row or double row angular ball bearing is used. However, in addition to the ball bearing, a rolling bearing such as a cylindrical roller bearing may be used as long as it has a load capacity capable of withstanding not only a radial load but also a thrust load. In addition, as described above, the case where the elastic body 5b is baked on the metal core 5a has been described as the hermetic seal 5. However, the end face of the outer ring 3b is formed on the axial end face of the shield using a metal shield. You may provide the protrusion part similar to the bulging part 5c which protrudes to the outward side more.
[0014]
【The invention's effect】
As described above in detail, according to the rolling bearing device of the present invention, a power transmission device having a relatively long shaft, in particular, a rolling bearing having a small friction torque in a power transmission device in which not only a radial load but also a thrust load is applied. It is possible to easily adjust the shim easily using the , so that the work efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is a simplified longitudinal sectional view of a rolling bearing device of the present invention.
FIG. 2 is an enlarged view of a portion P in FIG.
FIG. 3 (A) is a vertical sectional view showing a state of centering shim adjustment when the rolling bearing device of the present invention is incorporated in a power transmission device, and FIG. 3 (B) is an outer ring of a ball bearing. FIG. 6 is a partially enlarged view showing a state where the shim is not moved so much and is locked to the axial portion of the elastic material of the hermetic seal when the shim is mounted on the end face and the mission case is assembled.
FIG. 4 is a vertical sectional view showing a state where a tapered roller bearing is incorporated in a conventional transmission case.
FIG. 5 is a view showing a state in which a tapered roller bearing is incorporated in a conventional transmission case.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Countershaft 2 Housing case 3 Rolling bearing 3a Inner ring 3b Outer ring 3c Rolling body 3d Cage 5 Sealing seal 5a Core metal 5b Elastic body 5c Expansion part 6 Shim

Claims (2)

A rolling bearing composed of an inner ring and an outer ring, a rolling element held by a cage and a hermetic seal, a housing case in which the rolling bearing is disposed, and an adjustment shim disposed between the rolling bearings in the rolling bearing device is, the axial end surface of the sealing seal, Ri the bulging portion axially outward side of the end face of the outer ring of the rolling bearing is formed tare placing the shim, the bulging portion The rolling bearing device is characterized in that the movement of the shim is limited by the above .   The rolling bearing device according to claim 1, wherein the rolling bearing is a ball bearing.

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