JP2020090977A - Rolling bearing fixing structure - Google Patents

Abstract

To provide a rolling bearing fixing structure capable of preventing a position of a washer from deviating to enable excellent assemblability, upon holding the washer by a tapered roller bearing and a case.SOLUTION: A rolling bearing fixing structure is configured such that a part or the entire circumference of the inner peripheral portion of a washer 80 that defines the inner diameter of the washer 80 has an inclined part 83; the inclined part 83 is inclined so as to approach a case 10 in an axial direction of an outer ring 30; on a part or the entire circumference of the inner peripheral portion of a washer side contact surface 1021 of the case 10 that contacts a first contact surface 81 of the washer 80 in the axial direction of the outer ring 30, an inclined surface 1022 is provided; and with respect to the axial direction of the outer ring 30, the inclined surface 1022 is inclined in the same direction as the inclined part 83.SELECTED DRAWING: Figure 1

Description

The present invention relates to a rolling bearing fixing structure in which lubricating oil is supplied to an oil chamber formed inside a transmission case.

BACKGROUND ART Conventionally, in a transmission of a vehicle, a configuration is known in which lubricating oil in a case is supplied to a bearing that supports a rotating shaft. For example, in Patent Document 1, as a configuration in which the thrust washer changes into a taper shape due to a temperature rise, an appropriate preload is applied to the taper roller bearing during both cold and hot conditions. Further, for example, in Patent Document 2, the outer peripheral edge of the plate portion is sandwiched between the outer ring of the bearing and the step portion provided on the outer periphery of the bottom surface of the recess via a shim (spacer), so that The guide plate is fixed.

Japanese Utility Model Publication No. 05-006250 JP, 2013-113305, A

However, in the above-described conventional configuration in which the washer is sandwiched between the tapered roller bearing and the case, there is a problem that the position of the washer shifts when sandwiching and the assembling property deteriorates.

It is an object of the present invention to provide a rolling bearing fixing structure capable of suppressing displacement of the washer when sandwiching the washer between the tapered roller bearing and the case and improving the assemblability.

In order to solve the above problems, a rolling bearing fixing structure (for example, a rolling bearing fixing structure 1 described later) according to the present invention includes an inner ring (for example, an inner ring 40 described below), an outer ring (for example, an outer ring 30 described below), A plurality of rolling elements (for example, rolling elements described later) housed in an annular space between the inner ring and the outer ring, and a retainer (for example, a retainer 61 described later) that supports the plurality of rolling elements, A rolling bearing fixing structure in which an outer diameter portion of the outer ring is supported by a radial portion of a step portion of a case (for example, a case 10 described later). A washer (for example, a washer 80 described later) is sandwiched between the outer races, and the outer race is supported by the case via the washer, and the inner peripheral portion of the washer that defines the inner diameter of the washer is provided. Part or all of the circumference has an inclined portion (for example, an inclined portion 83 described later), and the inclined portion is inclined so as to approach the case in the axial direction of the outer ring, and the washer in the axial direction of the outer ring. An inclined surface (for example, an inclined surface 1022 described below) is provided on a part or the entire circumference of the inner peripheral portion of the washer-side contact surface of the case that is in contact with the first contact surface (for example, the first contact surface 81 described below). The inclined surface is provided so as to incline in the same direction as the inclined portion with respect to the axial direction of the outer ring.

As a result, when the bearing having the inner ring, the outer ring and the rolling element is assembled, the washer can be supported by the inclined surface, and the supporting length (inlay length) of the case including the inclined surface can be secured. Can be realized in a small space. That is, the washer slides due to the respective inclinations of the inclined surface of the case and the inclined portion of the washer, so that the assembly can be performed accurately. Further, the inclined surface and the inclined portion can guide the lubricating oil, and the lubricating oil can flow along the inclined surface and the inclined portion.

In addition, an inner ring support member (for example, a rotating shaft 90 described later) that rotates with respect to the case and is supported by the inner ring is provided, and the lubricating oil is the case, the outer ring, the washer, the inner ring, and the rolling element. It is preferable that the oil is supplied to an oil chamber (for example, an oil chamber S1 described later) formed by being surrounded by the cage and the inner ring support member. As a result, the inclined surface and the inclined portion can guide the lubricating oil in the oil chamber, and the lubricating oil can flow along the inclined surface and the inclined portion.

Further, an angle formed by the washer-side contact surface and the inclined portion (for example, an angle A2 described below) is smaller than an angle formed by the washer-side contact surface and the inclined surface (for example, an angle A1 described below). Is preferred. As a result, the washer can be favorably slid to an appropriate angle and position at the time of assembling, and the assembling can be reliably performed.

Further, it is preferable that the rolling element and the case-side portion of the cage are inclined toward the inner ring side with respect to the axial direction of the outer ring. As a result, since the bearing is inclined as described above, it is possible to make the bearing into a shape in which the lubricating oil can be easily sucked.

Further, the corners of the stepped portion are formed into an R chamfered shape. In the case of a washer having no inclined portion, when a washer having no inclined portion is to be sandwiched, a problem such as being caught by the R chamfered portion and deformed occurs. Further, in the case of forming the R chamfered shape, stress concentrates on the R chamfered portion, so that the radius of the R chamfered shape needs to be large in order to secure the strength. However, as described above, since the washer has the inclined portion, even if the corner portion of the step portion is formed into the R chamfered shape, it is possible to prevent such a problem from occurring and to position it reliably. it can.

Further, the length of the inclined portion in the radial direction of the outer ring (for example, the length L1 described later) is preferably longer than the radius dimension (for example, the radius dimension R1 described later) of the R chamfered shape of the corner portion. .. As a result, sliding (moving) of the washer with respect to the case becomes good at the time of assembly, and the washer can be reliably positioned in the radial direction.

In addition, the coefficient of friction between the first contact surface of the washer and the washer-side contact surface of the case is determined by a second contact surface of the washer (for example, a second contact surface 82 described below) and an outer ring that contacts the washer. It is preferably larger than the coefficient of friction with the contact surface (for example, the end surface 302 described later). As a result, the bearing can be surely slid with respect to the washer, and the wear of the case can be reduced by preventing the washer from sliding with respect to the case.

Further, it is preferable that a part of the cage on the case side is bent toward the inner ring in the radial direction of the outer ring. As a result, the inclined portion can guide the lubrication of the lubricating oil in the bearing.

According to the present invention, it is possible to provide a rolling bearing fixing structure capable of suppressing displacement of the washer when sandwiching the washer between the tapered roller bearing and the case and improving the assemblability.

FIG. 3 is a sectional view of a key portion showing the rolling bearing fixing structure according to the first embodiment of the present invention. It is a perspective view showing a washer of a rolling bearing fixed structure by a 1st embodiment of the present invention. It is an expanded sectional view showing a rolling bearing fixed structure by a 1st embodiment of the present invention. FIG. 6 is a cross-sectional view showing how the washer of the rolling bearing fixing structure according to the first embodiment of the present invention is assembled to the step portion. FIG. 3 is a cross-sectional view showing a state where the washer of the rolling bearing fixing structure according to the first embodiment of the present invention is assembled to the step portion. It is a perspective view showing a washer of a rolling bearing fixed structure by a 2nd embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional view of an essential part showing a rolling bearing fixing structure 1. FIG. 2 is a perspective view showing the washer 80 of the rolling bearing fixing structure 1. FIG. 3 is an enlarged cross-sectional view showing the rolling bearing fixing structure 1.
The rolling bearing fixing structure 1 constitutes a transmission (hereinafter referred to as “transmission”), and the transmission is mounted on a vehicle and changes a driving force from an engine (not shown) to drive wheels ( (Not shown). A rolling bearing fixing structure 1 that constitutes a transmission includes a transmission case (hereinafter referred to as “case”) 10, a taper roller bearing 20, a washer 80, and a rotating shaft (counter shaft) 90. The case 10 rotatably supports the rotating shaft 90 via the tapered roller bearing 20 and the washer 80.

The case 10 includes a support peripheral wall 101 having an outer ring contact surface 1011 that contacts the outer ring 30 in a radial direction of an outer ring 30 of the taper roller bearing 20 described later, and a fixed wall portion 102 extending perpendicularly to the support peripheral wall 101. ,have. The outer peripheral surface of the outer ring 30 contacts and is fixed to the outer ring contact surface 1011 of the support peripheral wall 101. As shown in FIG. 1, an R chamfered shape is formed at a connecting portion 104 between the supporting peripheral wall 101 and the fixed wall portion 102, and this portion constitutes a corner portion of an end portion of the step portion of the fixed wall portion 102. To do.

The fixed wall portion 102 includes a washer-side contact surface 1021 extending from the connecting portion 104 so as to be orthogonal to the support peripheral wall 101, an inclined surface 1022 provided to be connected to the washer-side contact surface 1021, and a bearing-side R-shaped surface. It has 1023 and a shaft facing surface 1024. These are connected in this order. A portion 811 on the outer peripheral side of the first contact surface 81, which is one surface of the washer 80 formed in a substantially plate-like annular shape, comes into contact with the washer-side contact surface 1021.

Here, the washer 80 will be described. The washer 80 is formed in a plate-like annular shape having a first contact surface 81 that is one surface and a second contact surface 82 that is the other surface. A part of the inner peripheral portion of the washer 80 that defines the inner diameter of the washer 80 has an inclined portion 83. Specifically, the inclined portion 83 is formed from the inner side in the radial direction of the outer peripheral portion 811 (see FIG. 1) of the washer 80 that defines the outer diameter of the washer 80 to the inner side of the washer 80 in the radial direction and the washer 80. It is configured by a rectangular convex portion protruding in the axial direction (left direction in FIGS. 1 and 2). Therefore, the inclined portion 83 is inclined so as to approach the case 10 in the axial direction of the outer ring 30. As shown in FIG. 3, the length L1 of the inclined portion 83 in the radial direction of the outer ring 30 is configured to be longer than the radial dimension R1 of the R chamfered connecting portion 104.

As shown in FIG. 2, three inclined portions 83 are provided in the circumferential direction of the washer 80. The washer 80 is sandwiched between the end surface 302 of the outer ring 30 and the step portion of the case 10 having the washer-side contact surface 1021 of the fixed wall portion 102 of the case 10 and the inclined surface 1022 in the axial direction of the outer ring 30. It is provided. The friction coefficient between the first contact surface 81 and the washer-side contact surface 1021 is the friction coefficient between the second contact surface 82 of the washer 80 that contacts the outer ring 30 and the end surface 302 that is the outer ring contact surface of the outer ring 30 that contacts the washer 80. Greater than. Therefore, the outer ring 30 is likely to slip with respect to the washer 80.

As shown in FIG. 1, an inclined portion 83 is opposed to the inclined surface 1022 while being separated from the inclined surface 1022. The inclined surface 1022 and the inclined portion 83 are inclined in the same direction with respect to the axial direction of the outer ring 30 of the tapered roller bearing 20, that is, in the direction approaching the axial center of the outer ring 30 of the tapered roller bearing 20 (lower left direction in FIG. 1 ). There is. An angle A2 formed between the washer-side contact surface 1021 and the inclined portion 83 is smaller than an angle A1 formed between the washer-side contact surface 1021 and the inclined surface 1022. For this reason, the space between the inclined surface 1022 and the inclined portion 83 is from the base of the inclined portion 83 integrally connected to the outer peripheral side portion 811 of the washer 80 that contacts the washer-side contact surface 1021 to the inclined portion 83. 1 gradually expands toward the left end in FIG.

The bearing-side R-shaped surface 1023 is a portion that connects the inclined surface 1022 and the shaft facing surface 1024, and is formed in an R chamfered shape that is recessed so as to be separated from the tip end portion of the inclined portion 83. The shaft facing surface 1024 extends in the radial direction of the outer ring 30 from the bearing-side R-shaped surface 1023 in parallel with the washer-side contact surface 1021. Therefore, the shaft-opposing surface 1024 with respect to the washer-side contact surface 1021 is located at a position advanced by one step in the axial direction of the outer ring 30 (position advanced by one step to the left side in FIG. 1), whereby the stepped portion of the fixed wall portion 102 is formed. Is configured.

The tapered roller bearing 20 is provided between the case 10 and the rotary shaft 90. The taper roller bearing 20 has an outer ring 30, an inner ring 40, rolling elements 50, and a cage 61.
The outer ring 30 is formed in an annular shape, and a peripheral surface 301, which is an end surface in the radial direction of the outer ring 30, contacts and is fixed to the outer ring contact surface 1011 of the support peripheral wall 101 of the case 10. A portion 821 on the outer peripheral side of the second contact surface 82, which is the other surface of the washer 80, comes into contact with the end surface 302 of the outer ring 30 in the axial direction.

The inner ring 40 is formed in an annular shape such that the axial center of the inner ring 40 coincides with that of the outer ring 30, and a peripheral surface 401, which is an end surface in the radial direction of the inner ring 40, contacts a side surface 901 of the rotating shaft 90. The axial end surface 402 of the inner ring 40 is in contact with the shaft side wall surface 902 extending from the side surface 901 in the radial direction of the inner ring 40, and the inner ring 40 is fixed to the rotating shaft 90 by the fixing member 63. An R-shaped chamfered R-shaped recess 904 is formed at a position where the side surface 901 of the rotating shaft 90 and the shaft side wall surface 902 are connected to each other inward in the radial direction of the rotating shaft 90.

The rolling element 50 is supported in the annular space between the outer peripheral surface of the inner ring 40 and the inner peripheral surface of the outer ring 30 by a retainer 61 about the axis of the inner ring 40, so that the rolling element 50 moves in the circumferential direction of the inner ring 40. A plurality of them are provided at equal intervals and accommodated. The rolling element 50 is configured to revolve the outer ring 30 relative to the inner ring 40 by rotating on its own axis.

The rolling element 50 is composed of “rollers” formed in a truncated cone shape, and the axis of the rolling element 50 intersects with the axes of the inner ring 40 and the outer ring 30 at a predetermined angle. It has a positional relationship. Therefore, the axis of the rolling element 50 is inclined toward the inner ring 40 side with respect to the axial direction of the outer ring 30 (the axis of the rolling element 50 becomes closer to the left and right of FIG. The holding base portion 612 of the holder 61 that holds the rolling element 50 is also tilted in the same manner. The end of the cage 61 on the washer 80 side is bent toward the inner ring 40 side in the radial direction of the outer ring 30 with respect to the holding base 612 (bent to the lower left as it goes to the left in FIG. 1). have.

In the rolling bearing fixing structure 1 that constitutes the transmission, an oil chamber S1 is formed. The oil chamber S1 is formed by being surrounded by the case 10, the outer ring 30, the washer 80, the inner ring 40, the rolling elements 50, the cage 61, and the rotating shaft 90. In the oil chamber S1, lubricating oil is supplied and flows in the direction of the arrow in FIG.

Next, the positioning of the washer 80 during assembly will be described. FIG. 4 is a cross-sectional view showing how the washer 80 of the rolling bearing fixing structure 1 is assembled to the step portion. FIG. 5 is a sectional view showing a state in which the washer 80 of the rolling bearing fixing structure 1 is assembled to the step portion.
At the time of assembly, first, the washer 80 is brought closer to the fixed wall portion 102 so that the second contact surface 82 of the washer 80 and the washer-side contact surface 1021 of the case 10 are in a positional relationship of facing each other.

When approaching in this manner, as shown in FIG. 4, the position of the washer 80 with respect to the case 10 may shift, and the inclined portion 83 of the washer 80 and the inclined surface 1022 of the case 10 may come into contact with each other. .. In such a contact, as shown by the arrow in FIG. 4, the inclined portion 83 of the washer 80 is guided along the inclined surface 1022 of the case 10, and the shaft center of the washer 80 and the outer ring 30 and the inner ring are guided. As shown in FIG. 5, the first contact surface 81 of the washer 80 approaches and contacts the washer-side contact surface 1021, and the washer 80 is located at a position where the washer 80 should originally be arranged. Will be placed.

The vehicle control system according to the present embodiment described above has the following effects.

In the rolling bearing fixing structure 1 according to the present embodiment, a washer 80 is provided between the step portion and the outer ring 30 in the axial direction of the outer ring 30, and the outer ring 30 is supported by the case 10 via the washer 80. Has been done. A part of the inner peripheral portion of the washer 80 that defines the inner diameter of the washer 80 has an inclined portion 83, and the inclined portion 83 is inclined so as to approach the case 10 in the axial direction of the outer ring 30. An inclined surface 1022 is provided on a part of an inner peripheral portion of the washer-side contact surface 1021 of the case 10 that is in contact with the first contact surface 81 of the washer 80 in the axial direction of the outer ring 30. The inclined surface 1022 is inclined in the same direction as the inclined portion 83 with respect to the axial direction of the outer ring 30.

As a result, when the tapered roller bearing 20 is mounted as a bearing, the washer 80 can be supported by the inclined surface 1022, and the supporting length (inlay length) of the case 10 including the inclined surface 1022 can be secured. It can be realized in a small space. That is, the washer 80 slides due to the inclination of the inclined surface 1022 of the case 10 and the inclination of the inclined portion 83 of the washer 80, thereby enabling accurate assembly. Further, the inclined surface 1022 and the inclined portion 83 can guide the lubricating oil, and the lubricating oil can flow along the inclined surface 1022 and the inclined portion 83.

In addition, the rolling bearing fixing structure 1 according to the present embodiment has the rotating shaft 90 as an inner ring support member that rotates with respect to the case 10 and is supported by the inner ring 40, and the lubricating oil is used for the case 10 and the outer ring 30. The oil is supplied to an oil chamber S1 formed by being surrounded by the washer 80, the inner ring 40, the rolling elements 50, the cage 61, and the rotating shaft 90. As a result, the inclined surface 1022 and the inclined portion 83 can guide the lubricating oil in the oil chamber S1, and the lubricating oil can flow along the inclined surface 1022 and the inclined portion 83.

Further, in the rolling bearing fixing structure 1 according to the present embodiment, the angle A2 formed by the washer-side contact surface 1021 and the inclined portion 83 is smaller than the angle A1 formed by the washer-side contact surface 1021 and the inclined surface 1022. As a result, at the time of assembly, the washer 80 can be favorably slid to an appropriate angle and position, and the assembly can be reliably performed.

Further, in the rolling bearing fixing structure 1 according to the present embodiment, the rolling element 50 and the case 10 side portion of the cage 61 are inclined toward the inner ring side with respect to the axial direction of the outer ring 30. As a result, since the taper roller bearing 20 as the bearing is inclined as described above, it is possible to form the tapered roller bearing 20 into a shape in which the lubricating oil is easily sucked.

Further, in the rolling bearing fixing structure 1 according to the present embodiment, the corners of the stepped portion are formed into the R chamfered shape. In the case of a washer without the inclined portion 83, when a washer without the inclined portion 83 is tried to be sandwiched, a problem such as being caught by the R-chamfered portion (connection portion 104) and deformed occurs. .. Further, in the case of forming the R chamfered shape, stress concentrates on the R chamfered portion, so that the radius of the R chamfered shape needs to be large in order to secure the strength. However, in the present embodiment, since the washer 80 has the inclined portion 83, even if the corner portion of the step portion is formed into the R chamfered shape, it is possible to prevent such a problem from occurring and to ensure it. Can be positioned.

Further, in the rolling bearing fixing structure 1 according to the present embodiment, the length L1 of the inclined portion 83 in the radial direction of the outer ring 30 is longer than the radius dimension R1 of the R chamfered shape of the corner portion. As a result, the washer 80 slides (moves) well relative to the case 10 during assembly, and the washer 80 can be reliably positioned in the radial direction.

Further, in the rolling bearing fixing structure 1 according to the present embodiment, the friction coefficient between the first contact surface 81 of the washer 80 and the washer-side contact surface 1021 of the case 10 is different from that of the second contact surface 82 of the washer 80 and the washer 80. It is larger than the friction coefficient with the end surface 302 as the outer ring contact surface that comes into contact. As a result, the tapered roller bearing 20 can be reliably slid with respect to the washer 80, and the wear of the case 10 can be reduced by preventing the washer 80 from sliding with respect to the case 10.

Further, in the rolling bearing fixing structure 1 according to the present embodiment, a part of the cage 61 on the case 10 side has a bent portion 611 that is bent toward the inner ring 40 side in the radial direction of the outer ring 30. As a result, the inclined portion 83 can guide the lubrication oil in the tapered roller bearing 20.

Next, a rolling bearing fixing structure according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a perspective view showing a washer 80A having a rolling bearing fixing structure.

In 2nd Embodiment, the structure of the washer 80A which comprises a rolling bearing fixed structure differs from the washer 80 in this embodiment. The rest of the configuration is the same as that of the first embodiment, so the description is omitted.

The inclined portion 83A of the washer 80A is integrally molded with a radially inner portion of the outer peripheral portion 811A of the washer 80A that defines the outer diameter of the washer 80A, and is provided over the entire circumference of the inner peripheral portion. .. Therefore, the lubricating oil can be made to flow along the inclined portion 83A over the entire circumference of the washer 80.

The present invention is not limited to the above-described embodiments, and can be modified within the technical scope described in the claims.

For example, the configurations of the inner ring, the outer ring, the rolling elements, the retainer, the washer, the inclined portion, the inclined surface, etc. are the same as those of the inner ring 40, the outer ring 30, the rolling element 50, the cage 61, the washer 80, the inclined portion 83, and the inclined portion in this embodiment. It is not limited to the configuration of the surface 1022 or the like. For example, the inclined portion of the washer may be provided in a number of four, five, or the like. Similarly, the inclined surface may be formed over the entire circumference of the inner peripheral portion of the washer-side contact surface of the case, or may be provided in a part of the inner peripheral portion of the washer-side contact surface of the case. Good.
Also, for example, the inclined surface may have another shape. The other shape means, for example, a cross section viewed from the same direction as in FIG. 1, and does not have a linear shape as in FIG. 1, and may have a step shape, for example.

1 Rolling bearing fixing structure 1
10 Case 30 Outer Ring 40 Inner Ring 50 Rolling Element 61 Cage 80 Washer 81 First Contact Surface 82 Second Contact Surface 83 Inclined Part 90 Rotating Shaft (Inner Ring Support Member)
302 End surface (outer ring contact surface)
1022 inclined surface A1 angle A2 angle L1 length R1 radius dimension S1 oil chamber

Claims (8)

An inner ring, an outer ring, a plurality of rolling elements housed in an annular space between the inner ring and the outer ring, and a retainer supporting the plurality of rolling elements,
A rolling bearing fixing structure in which an outer diameter portion of the outer ring is supported by a radial portion of a step portion of the case,
A washer is provided between the step portion and the outer ring in the axial direction of the outer ring, and the outer ring is supported by the case via the washer.
Part or all of the inner peripheral portion of the washer that defines the inner diameter of the washer has an inclined portion,
The inclined portion is inclined so as to approach the case in the axial direction of the outer ring,
An inclined surface is provided on a part or the entire circumference of the inner peripheral portion of the washer-side contact surface of the case that contacts the first contact surface of the washer in the axial direction of the outer ring.
The rolling bearing fixing structure, wherein the inclined surface is inclined in the same direction as the inclined portion with respect to the axial direction of the outer ring. An inner ring support member that rotates with respect to the case and is supported by the inner ring;
The rolling bearing according to claim 1, wherein lubricating oil is supplied to an oil chamber formed by being surrounded by the case, the outer ring, the washer, the inner ring, the rolling element, the cage, and the inner ring support member. Fixed structure. The rolling bearing fixing structure according to claim 1 or 2, wherein an angle formed by the washer-side contact surface and the inclined portion is smaller than an angle formed by the washer-side contact surface and the inclined surface. The rolling bearing fixing structure according to any one of claims 1 to 3, wherein the rolling element and the case-side portion of the cage are inclined toward the inner ring side with respect to the axial direction of the outer ring. The rolling bearing fixing structure according to any one of claims 1 to 4, wherein the corner portion of the step portion is formed into an R chamfered shape. The rolling bearing fixing structure according to claim 5, wherein a length of the inclined portion in the radial direction of the outer ring is longer than a radius dimension of the R chamfered shape of the corner portion. The friction coefficient between the first contact surface of the washer and the washer-side contact surface of the case is larger than the friction coefficient between the second contact surface of the washer and the outer ring contact surface in contact with the washer. The rolling bearing fixing structure according to claim 5. The rolling bearing fixing structure according to any one of claims 1 to 7, wherein a portion of the cage on the case side is bent toward the inner ring in a radial direction of the outer ring.

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