JP6876030B2 - Rolling bearing fixed structure - Google Patents

Description

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

Conventionally, in a vehicle transmission, it has been known that a lubricating oil in a case is supplied to a bearing that supports a rotating shaft. For example, Patent Document 1 is configured such that the thrust washer changes to a tapered shape as the temperature rises, so that an appropriate preload is applied to the tapered roller bearing both when it is cold and when it is hot. 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 concave portion via a shim (spacer), so that the outer peripheral edge of the plate portion is sandwiched in the concave portion. The guide plate is fixed.

Jikkenhei 05-006250 Japanese Unexamined Patent Publication No. 2013-113305

However, in the 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 the washer is sandwiched, and the assembling property deteriorates.

An object of the present invention is to provide a rolling bearing fixing structure capable of suppressing the position of the washer from shifting when the washer is sandwiched between the tapered roller bearing and the case and improving the assembling property.

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

As a result, when assembling the bearing having the inner ring, the outer ring, and the rolling element, the washer can be supported on 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 inclination of the inclined surface of the case and the inclined portion of the washer, so that the washer can be assembled 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.

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

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 in this way, it is possible to make the shape so that the lubricating oil can be easily sucked into the bearing.

Further, the corners of the stepped portion are formed in an R chamfered shape. In the case of a washer without an inclined portion, if an attempt is made to sandwich the washer without an inclined portion, a problem such as being caught in such an R chamfered portion and being deformed occurs. Further, when the shape is formed like the R chamfer shape, stress is concentrated on the portion of the R chamfer shape, so that it is necessary to take a large radius of the R chamfer shape in order to secure the strength. However, as described above, since the washer has an inclined portion, even if the corner portion of the step portion is formed in an R chamfered shape, it is possible to prevent such a problem from occurring and to reliably position the washer. 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 radial dimension of the R chamfered shape of the corner portion (for example, the radial dimension R1 described later). .. As a result, the washer slides (moves) with respect to the case during assembly, and the washer can be reliably positioned in the radial direction.

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

Further, it is preferable that a part of the cage on the case side is bent toward the inner ring side in the radial direction of the outer ring. This makes it possible to guide the lubrication of the lubricating oil in the bearing by the inclined portion.

According to the present invention, it is possible to provide a rolling bearing fixing structure capable of suppressing the position of the washer from shifting when the washer is sandwiched between the tapered roller bearing and the case and improving the assembling property.

It is sectional drawing of the main part which shows the rolling bearing fixing structure by 1st Embodiment of this invention. It is a perspective view which shows the washer of the rolling bearing fixed structure by 1st Embodiment of this invention. It is an enlarged sectional view which shows the rolling bearing fixing structure by 1st Embodiment of this invention. It is sectional drawing which shows the state of assembling the washer of the rolling bearing fixing structure by 1st Embodiment of this invention to a step portion. It is sectional drawing which shows the state which the washer of the rolling bearing fixing structure by 1st Embodiment of this invention is assembled to a step portion. It is a perspective view which shows the washer of the rolling bearing fixed structure by 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of a main part showing a rolling bearing fixing structure 1. FIG. 2 is a perspective view showing a 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 fixed structure 1 constitutes a transmission (hereinafter referred to as a "transmission"), and the transmission is mounted on a vehicle and shifts a driving force from an engine (not shown) to drive wheels (hereinafter, not shown). Not shown). The rolling bearing fixing structure 1 constituting the transmission includes a transmission case (hereinafter referred to as "case") 10, a tapered 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 abuts on the outer ring 30 in the radial direction of the outer ring 30 described later of the tapered roller bearing 20, and a fixed wall portion 102 extending so as to be orthogonal to the support peripheral wall 101. ,have. The outer peripheral surface of the outer ring 30 abuts and is fixed to the outer ring contact surface 1011 of the support peripheral wall 101. As shown in FIG. 1, the connecting portion 104 between the supporting peripheral wall 101 and the fixed wall portion 102 is formed in an R chamfered shape, and this portion constitutes a corner portion of an end portion of a 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 connection portion 104 so as to be orthogonal to the support peripheral wall 101, an inclined surface 1022 provided 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. The outer peripheral side portion 811 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 which is one surface and a second contact surface 82 which 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 inside 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 inside in the radial direction of the washer 80 and the washer 80. It is composed of rectangular protrusions protruding in the axial direction (leftward 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 stepped portion of the case 10 having the washer-side contact surface 1021 and the inclined surface 1022 of the fixed wall portion 102 of the case 10 and the end surface 302 of the outer ring 30 in the axial direction of the outer ring 30. It is provided. The coefficient of friction between the first contact surface 81 and the washer-side contact surface 1021 is the coefficient of friction between the second contact surface 82 of the washer 80 in contact with the outer ring 30 and the end surface 302 as the outer ring contact surface of the outer ring 30 in contact with the washer 80. Greater than. Therefore, the outer ring 30 is slippery with respect to the washer 80.

As shown in FIG. 1, the inclined portion 83 faces the inclined surface 1022 at a distance 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 a direction approaching the axial center of the outer ring 30 of the tapered roller bearing 20 (lower left direction in FIG. 1). There is. 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. Therefore, the space between the inclined surface 1022 and the inclined portion 83 is from the base of the inclined portion 83 to the inclined portion 83 integrally connected to the outer peripheral side portion 811 of the washer 80 that abuts on the washer-side contact surface 1021. It gradually expands toward the tip in the left direction in FIG.

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

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

The inner ring 40 is formed in an annular shape in a positional relationship in which the axis coincides with the outer ring 30, and the peripheral surface 401, which is the end surface of the inner ring 40 in the radial direction, is in contact with the side surface 901 of the rotating shaft 90. The end surface 402 of the inner ring 40 in the axial direction is in contact with the shaft side wall surface 902 extending in the radial direction of the inner ring 40 from the side surface 901, and the inner ring 40 is fixed to the rotating shaft 90 by the fixing member 63. At the connection position between the side surface 901 of the rotating shaft 90 and the side wall surface 902 of the shaft, an R-shaped recess 904 having an R-chamfer shape that is recessed inward in the radial direction of the rotating shaft 90 is formed.

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 the cage 61 around the axis of the inner ring 40, so that the rolling element 50 is supported in the circumferential direction of the inner ring 40. A plurality of them are provided at equal intervals and housed. The rolling element 50 is configured to revolve the outer ring 30 relative to the inner ring 40 by rotating on its axis.

The rolling element 50 is composed of "rollers" formed in a conical shape, and the axes of the rolling elements 50 intersect 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 with respect to the axial direction of the outer ring 30 (the axis of the rolling element 50 becomes the axis of the outer ring 30 and the inner ring 40 as it moves to the left in FIG. The holding base 612 of the cage 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 in the radial direction of the outer ring 30 (bent in the lower left direction as it goes to the left in FIG. 1) with respect to the holding base 612. have.

In the rolling bearing fixing structure 1 constituting the transmission, an oil chamber S1 is formed. The oil chamber S1 is formed by being surrounded by a case 10, an outer ring 30, a washer 80, an inner ring 40, a rolling element 50, a cage 61, and a 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 at the time of 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 stepped portion. FIG. 5 is a cross-sectional view showing a state in which the washer 80 of the rolling bearing fixing structure 1 is assembled to the stepped 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 facing each other.

As shown in FIG. 4, the position of the washer 80 with respect to the case 10 may shift when the washers are brought closer to each other, 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 the case of contact in this way, as shown by an 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 axial center of the washer 80 and the outer ring 30 and the inner ring are formed. As shown in FIG. 5, the first contact surface 81 of the washer 80 approaches and comes into contact with the washer-side contact surface 1021, and the washer 80 is placed at a position where the washer 80 should be originally arranged. Be placed.

According to the vehicle control system according to the present embodiment described above, the following effects are achieved.

In the rolling bearing fixing structure 1 according to the present embodiment, a washer 80 is provided between the stepped 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 the inner peripheral portion of the washer-side contact surface 1021 of the case 10 which is in contact with the first contact surface 81 of the washer 80 in the axial direction of the outer ring 30. With respect to the axial direction of the outer ring 30, the inclined surface 1022 is inclined in the same direction as the inclined portion 83.

As a result, when the tapered roller bearing 20 is assembled 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 inclined portion 83 of the washer 80, so that the washer 80 can be assembled accurately. 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.

Further, in the rolling bearing fixing structure 1 according to the present embodiment, the rolling bearing fixing structure 1 has a rotating shaft 90 as an inner ring supporting member that rotates with respect to the case 10 and is supported by the inner ring 40, and the lubricating oil is the case 10 and the outer ring 30. It is supplied to the oil chamber S1 formed by being surrounded by the washer 80, the inner ring 40, the rolling element 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, the washer 80 can be satisfactorily slid to an appropriate angle and position at the time of assembly, and the assembly can be performed reliably.

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

Further, in the rolling bearing fixing structure 1 according to the present embodiment, the corners of the stepped portion are formed in an R chamfered shape. In the case of a washer without an inclined portion 83, if an attempt is made to sandwich a washer without an inclined portion 83, a problem such as being caught in such an R chamfered portion (connection portion 104) and being deformed occurs. .. Further, when the shape is formed like the R chamfer shape, stress is concentrated on the portion of the R chamfer shape, so that it is necessary to take a large radius of the R chamfer shape 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 in the R chamfered shape, it is possible to prevent such a problem from occurring and to ensure it. Can be positioned to.

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 radial dimension R1 of the R chamfered shape of the corner portion. As a result, the washer 80 slides (moves) with respect to the case 10 at the time of 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 set to 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 contact surface of the outer ring to be contacted. As a result, the taper roller bearing 20 can be reliably slid with respect to the washer 80, and by preventing the washer 80 from slipping with respect to the case 10, wear of the case 10 can be reduced.

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 in the radial direction of the outer ring 30. As a result, the inclined portion 83 makes it possible to guide the lubrication of the lubricating oil in the tapered roller bearing 20.

Next, the rolling bearing fixing structure according to the 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 fixed rolling bearing structure.

In the second embodiment, the structure of the washer 80A constituting the rolling bearing fixing structure is different from that of the washer 80 in the present embodiment. The other configurations are the same as those in the first embodiment, and thus the description thereof will be omitted.

The inclined portion 83A of the washer 80A is integrally molded with the inner portion in the radial direction 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 side portion. .. Therefore, the lubricating oil can flow along the inclined portion 83A over the entire circumference of the washer 80.

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

For example, the configuration of the inner ring, the outer ring, the rolling element, the cage, the washer, the inclined portion, the inclined surface and the like includes 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 surface. The configuration is not limited to the surface 1022 and the like. For example, the inclined portions 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 on a part of the inner peripheral portion of the washer-side contact surface of the case. May be good.
Further, 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, which is not linear as shown in FIG. 1, and may be, for example, a stepped shape or the like.

1 Rolling bearing fixed 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 face (outer ring contact surface)
1022 Inclined surface A1 Angle A2 Angle L1 Length R1 Radial dimension S1 Oil chamber

Claims (7)

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 cage for supporting the plurality of rolling elements.
A rolling bearing fixing structure in which the outer diameter portion of the outer ring is supported by a radial portion of the step portion of the case.
A washer is provided between the stepped 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.
A part or the entire circumference 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 all of the inner peripheral portion of the washer-side contact surface of the case in contact with the first contact surface of the washer in the axial direction of the outer ring.
With respect to the axial direction of the outer ring, the inclined surface is inclined in the same direction as the inclined portion, and the inclined surface is inclined .
A rolling bearing fixing structure in which the angle formed by the washer-side contact surface and the inclined portion is smaller than the angle formed by the washer-side contact surface and the inclined surface. It has 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 the 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 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 3 , wherein the corner portion of the step portion is formed in an R chamfered shape. The rolling bearing fixing structure according to claim 4 , wherein the length of the inclined portion in the radial direction of the outer ring is longer than the radial 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 any one of claims 4. The rolling bearing fixing structure according to any one of claims 1 to 6 , wherein a part of the cage on the case side is bent toward the inner ring side in the radial direction of the outer ring.

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