JP4097049B2 - Support bearing for transmission with built-in friction damper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support bearing for a transmission with a built- in friction damper . The support bearing for a transmission with a built-in friction damper is used for a transmission such as a transmission of an automobile or a transfer of a four-wheel drive vehicle.
[0002]
[Prior art]
For example, in a transmission such as a transmission of an automobile or a transfer of a four-wheel drive vehicle, an abnormal noise may be generated due to a collision of a meshing portion between a drive gear and a driven gear.
[0003]
As an example of the transmission, a transfer of a four-wheel drive vehicle will be described with reference to FIG. In the figure, B indicates the entire transfer, 70 is a case, 71 is a main shaft, 72 is a main gear, 73 is a low gear, 74 is a synchromesh mechanism, 75 is a counter gear, 76 is a front drive sprocket, and 77 is a front drive. A drive shaft, 78 is a drive chain, and 79 is an oil seal.
[0004]
In such a transfer B, between the case 70 and the main shaft 71, between the case 70 and the main gear 72, between the case 70 and the counter gear 75, between the main shaft 71, the main gear 72, and the low gear 73, and the like. Are provided with various rolling bearings 80 to 85.
[0005]
In such a transfer B, for example, if there is a fluctuation in the input rotational speed to the main shaft 71, the main gear 72 or the low gear 73 as a driving gear and the counter gear 75 as a driven gear collide with each other in a severe case. Abnormal noise may occur. That is, since backlash exists between the main gear 72 or the low gear 73 and the counter gear 75, when the rotation speed of the main gear 72 or the low gear 73 is temporarily reduced, the counter gear 75 is rotated by the inertial force. The counter gear 75 and the main gear 72 or the low gear 73 may collide with each other.
[0006]
As a countermeasure against such abnormal noise, it is considered to use a sub gear 86 and a dish spring 87 as shown in FIG. In other words, the sub gear 86 is attached to the side of the counter gear 15, and the sub gear 86 is pressed against the counter gear 75 by the elastic urging force of the dish spring 87. Reference numeral 88 denotes a retaining ring.
[0007]
As described above, if rotational resistance is applied to the counter gear 75, the counter gear 75 advances even when the rotational speed of the main gear 72 or the low gear 73 temporarily decreases with the fluctuation of the input rotational speed to the main shaft 71. Therefore, the counter gear 75 can be prevented from colliding against the main gear 72 or the low gear 73.
[0008]
[Problems to be solved by the invention]
By the way, in the noise countermeasure described above, since many extra parts are used, the parts cost and the number of assembling steps are inevitably increased.
[0009]
On the other hand, the applicant of the present application considers mounting a known friction damper at an appropriate place between the counter gear 75 and the case 70 (not shown) as an alternative to the sub gear 86 and the dish spring 87 described above. It was. Also in this case, the number of parts can be reduced as compared with the sub gear 86 and the dish spring 87 described above, and the generation of abnormal noise can be prevented as described above.
[0010]
When the friction damper is used in this way, the number of parts can be reduced as compared with the above-described countermeasure against abnormal noise. However, since new parts that are not still main parts of the transfer B are used, the number of assembly steps for the transfer B increases. There is no change. Moreover, in order to incorporate the friction damper as described above into a use target, it is necessary to secure a dedicated arrangement space, and for example, a partial design change of the transfer B is unavoidable.
[0011]
In view of such circumstances, the applicant of the present application has considered incorporating a friction damper in a rolling bearing which is an existing part of a transmission such as Transfer B, for example. This is the object of the present invention.
[0012]
[Means for Solving the Problems]
A friction bearing built-in support bearing according to the first aspect of the present invention is a rolling bearing used as a support bearing for a transmission, and the rolling bearing has an inner ring and an outer ring, and the width of the inner ring is the width of the outer ring. The friction damper is formed to be at least as large as the attachment width of the friction damper, and the friction damper is incorporated in the wide portion. The friction damper includes an annular cored bar having a U-shaped cross section and an outer side in the radial direction of the annular cored bar. The elastic body has an outer peripheral surface that is tapered, the outer side in the axial direction is smaller than the outer diameter of the outer ring, and the inner side in the axial direction is the outer side of the outer ring. is formed to have a larger diameter than the diameter, the radial inner annular core metal is mounted, the peripheral surface of the annular body or Ranaru rotational resistance applying target transmission the outer ring is attached to the wide portion of the inner ring Bullet Body was in contact, characterized in that it allows the oil passage in the axial direction together with providing rotational resistance to the rotation resistance grantees.
[0014]
As described above, according to the present invention, by incorporating a friction damper in the rolling bearing, even if the rotating member supported by the rolling bearing has a play in the rotation direction, the friction is absorbed by the friction damper of the rolling bearing to rotate. Advance and delay can be suppressed.
[0015]
As a result, the use of the rolling bearing according to the present invention in place of the existing rolling bearing used for a transmission or the like can not only prevent generation of abnormal noise in the transmission, but also a friction damper alone. Compared to the case of separate installation, it is possible to save the waste of space and the trouble of assembling.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Details of the present invention will be described based on the embodiment shown in FIGS.
[0017]
1 and 2 relate to one embodiment of the present invention, FIG. 1 is a longitudinal side view of a rolling bearing, and FIG. 2 is a cross-sectional view taken along line (2)-(2) in FIG.
[0018]
In the figure, A indicates the entire rolling bearing, and here, a deep groove ball bearing is illustrated. The rolling bearing A includes an inner ring 1, an outer ring 2, a plurality of rolling elements 3, a cage 4, and a friction damper 5.
[0019]
The friction damper 5 is attached to the annular cored bar 6 and brought into contact with the outer peripheral surface of the inner ring 1, and is attached to the inner peripheral surface of the outer ring 2 by press-fitting to the inner peripheral surface of the shoulder at one shaft end. And an elastic body 7. The annular cored bar 6 includes a cylindrical portion 6a and an annular plate portion 6b extending radially inward from one axial end thereof, and an elastic body 7 is attached to the inner surfaces thereof. Further, semicircular cutouts 7 a that allow oil to pass in the axial direction are provided at several locations on the inner circumference of the elastic body 7.
[0020]
The friction damper 5 is provided with an appropriate rotational resistance when the elastic body 7 is brought into contact with the outer peripheral surface of the inner ring 1 from the radial direction with a required repulsive elastic force.
[0021]
Such a rolling bearing A with a friction damper 5 is used in each part of a transfer B of a four-wheel drive vehicle as shown in FIG. 5, for example. Specifically, if the rolling bearings 82 and 83 between the case 70 and the counter gear 75 are the above-described rolling bearing A of the present invention, the main gear 72 or the low gear 73 and the counter gear 75 that cause abnormal noise are generated. It becomes possible to prevent the collision.
[0022]
That is, since the inner ring 1 of the rolling bearing A is integrated with the counter gear 75, a required rotational resistance is given to the counter gear 75 by the friction damper 5 built in the rolling bearing A. In this case, it is desirable that the friction damper 5 gives a rotational resistance equal to or greater than the moment of inertia of the counter gear 75. For this reason, even if the advance / delay of the main gear 72 or the low gear 73 occurs due to the fluctuation of the input rotational speed to the main shaft 71, the counter gear 75 follows the advance / delay of the main gear 72 or the low gear 73. 72 or the low gear 73 and the counter gear 75 can be made difficult to disengage, and as a result, the collision between the main gear 72 or the low gear 73 and the counter gear 75 can be prevented, and the generation of abnormal noise can be prevented. Become. In addition, as the transfer B, it is only necessary to replace the existing rolling bearings 82 and 83 with the rolling bearing A of the present invention, so that a dedicated space as in the case of incorporating the friction damper alone described in the conventional example into the transfer B is sufficient. This eliminates the need to secure the design or to change the design of a part of the transfer B, and does not increase the number of assembly steps.
[0023]
In addition, this invention is not limited only to the said embodiment, Various application and deformation | transformation can be considered.
[0024]
(1) The form of the rolling bearing A is not limited to the deep groove ball bearing in the above-described embodiment, but may be an angular ball bearing or various roller bearings. In addition, for example, as shown in FIG. 3, a rolling bearing A in a form using a shaft body 10 instead of the inner ring 1 can be provided. In the example shown in FIG. 3, the shaft body 10 is a rotating member, and the outer ring 2 is a non-rotating member fixed to a case or the like (not shown). The friction damper 5 is attached to the outer ring 2, and the elasticity of the friction damper 5 is set. The body 7 is brought into contact with the outer peripheral surface of the shaft body 10.
[0025]
(2) In the above embodiment, the friction damper 5 has an example in which the elastic body 7 is brought into contact with the inner ring, but the elastic body 7 is brought into contact with the outer ring. It is good also as a structure. For example, the friction damper 5 'can be incorporated in the rolling bearing A in the form shown in FIG. In this example, an annular cored bar 6 of a friction damper 5 'is attached to the outer peripheral surface of an extended portion 1a extending one axial end of the inner ring 1, and an elastic body 7 is abutted against an outer ring 20 to which the outer ring 2 is attached. It comes to contact. The inner ring 1 and the outer ring 2 may be configured such that one of them is rotated and the other is not rotated, or the inner / outer rings 1 and 2 are relatively rotated.
[0026]
(3) The shape of the friction dampers 5, 5 ′ itself and the shape and number of the notches 7 a provided in the elastic body 7 are not particularly limited.
[0027]
(4) The application object of the rolling bearing A of the present invention is not limited to the transfer B of the four-wheel drive vehicle shown in FIG. 5, but may be a transmission of an automobile although not shown.
[0028]
【The invention's effect】
In the invention of claim 1, by incorporating the friction damper in the rolling bearing, even if the rotating member supported by the rolling bearing has play in the rotational direction, the play is absorbed by the friction damper of the rolling bearing. It becomes possible to suppress the rotation delay.
[0029]
Accordingly, when the support bearing for a transmission with a built- in friction damper according to the present invention is used, for example, in a counter gear support portion of a transfer of a four-wheel drive vehicle, a collision between the main gear or the low gear and the counter gear, which causes abnormal noise, is prevented. Not only can this be effectively prevented, but it is not necessary to secure a dedicated space compared to the case where a single friction damper as described in the previous example is incorporated in the transfer, and the compactness and assembly are eliminated, such as saving the trouble of installation. It will be possible to contribute to cost reduction.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a rolling bearing according to an embodiment of the present invention. FIG. 2 is a sectional view taken along line (2)-(2) of FIG. Fig. 4 is a longitudinal sectional side view of a rolling bearing according to still another embodiment of the present invention. Fig. 5 is a partial sectional view showing a transfer of a general four-wheel drive vehicle. Enlarged view around the counter gear [Explanation of symbols]
A Rolling bearing 1 Inner ring 2 Outer ring 5 Friction damper 6 Friction damper annular metal core 7 Friction damper elastic body 7a Elastic body notch

Claims (1)

A rolling bearing used as a support bearing for a transmission,
The rolling bearing has an inner ring and an outer ring, and the width of the inner ring is formed to be larger than the width of the outer ring by at least the attachment width of the friction damper, and the friction damper is built in the wide portion,
The friction damper includes an annular cored bar having a U-shaped cross section and an elastic body attached along a circumferential direction radially outward of the annular cored bar, and the outer circumferential surface of the elastic body is tapered. The outer side in the axial direction is smaller than the outer diameter of the outer ring, and the inner side in the axial direction is formed larger than the outer diameter of the outer ring,
Wherein the wide portion of the inner ring is mounted a radially inner annular core metal, is in contact with the elastic member on a peripheral surface of the annular body or Ranaru rotation resistance applying target transmission the outer ring is mounted, the rotational resistance A support bearing for a transmission with a built-in friction damper, which imparts rotational resistance to an object to be applied and allows passage of oil in an axial direction.

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