JPH0720412Y2 - Bearing device for railway vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a bearing device for a railway vehicle in which a bearing is sealed.

<Prior Art> Conventionally, as a bearing device for a railway vehicle of this type, as shown in FIG. 2, a rear lid 51 fitted to a step portion 70a formed by an R surface of an axle 70, and the above-mentioned axle. A double-row roller bearing 5 provided with sleeves 54, 54 arranged on both sides between a front lid 53 fixed to the end surface 70a of 70 by axial bolts 52, 52, ...
A pair of seal retaining rings 57 and 58, which are provided in close contact with each other in the axial direction of the outer ring 56 of the double row roller bearing 55, and the seal retaining portions 57a of the pair of seal retaining rings 57 and 58, respectively. The outer peripheral surface 54 of the sleeves 54, 54 is urged toward the inner side in the radial direction by the springs 59, 59 while being baked on the outer peripheral surface 54, 58a.
Lips 60a, 60a and dust shields 60b, 60b slidingly contacting a, 54a
There is a seal member 60, which has a seal to prevent water and dust from entering the inside of the double-row roller bearing 55.

<Problems to be Solved by the Invention> However, in the above-described conventional railroad vehicle bearing device, the seal holding rings 57, 58 are respectively provided with one holding portion 57a, 58a and the sleeve 54, 54, respectively. Since it is only sealed with a sealing member having two lips 60a, 60a and dust repellents 60b, 60b, it can be used for railway vehicles operating in special areas such as areas with a lot of rainfall and desert areas with a lot of dust. , Dust such as water or sand dust enters the double-row roller bearing through the path indicated by the arrow in the figure, causing poor lubrication of the rolling parts of the bearing, or damage to the roller or raceway surface. As a result, there is a problem that the life of the bearing device for a railway vehicle cannot be maintained for a long time.

Therefore, the object of the present invention is to improve the sealing property without increasing the outer dimensions and reducing the space for the bearing and the space for enclosing the lubricant between the seal member and the bearing. To provide a bearing device for a railway vehicle that is long and has a long life without being invaded by water or dust even when used in a special area such as a high rainfall area or a dusty desert area. is there.

<Means for Solving the Problems> In order to achieve the above object, the present invention has a rear lid fitted to a step portion of an axle, and a front lid provided at an end portion of the axle,
A double row roller bearing having sleeves arranged on both sides between the rear lid and the front lid, and one end fixed to both axial sides of the outer ring of the double row roller bearing and the other end radially. Bearing device for railway vehicle comprising a pair of seal retaining rings having extending seal retaining portions, and a seal member provided in the seal retaining portion of the seal retaining ring and sealing the inside of the double row roller bearing together with the seal retaining ring. The side surfaces of the rear lid and the front lid on the double-row roller bearing side are provided with annular recesses whose inner peripheral surfaces on the outer side in the radial direction are cylindrical surfaces, and the seal member is the seal holder. Of the main lip portion, which is located on the inner side of the bearing, is in sliding contact with the outer peripheral surface of the sleeve, and has its tip facing the inside of the bearing, and the radial direction so that it is located inside the recess on the outer side of the bearing of the seal holding portion. It is projected and goes toward the tip. Which has a gradient as to approach the the double-row roller bearing Te, the leading end is characterized in that an auxiliary lip in sliding contact with the cylindrical surface in the recess of the rear lid and front lid.

<Operation> When the axle rotates, the rear lid, the front lid, the pair of sleeves, and the inner ring of the double-row roller bearing rotate together. On the other hand, the outer ring of the double-row roller bearing, the pair of seal retaining rings fixed to both sides of the outer ring in the axial direction, and the respective seal members provided in the seal retaining portions of the seal retaining ring are stationary. The main lip portion of the seal member is located on the inner side of the bearing of the seal holding portion, is in sliding contact with the outer peripheral surface of the sleeve, and has the tip facing the inside of the bearing, while the auxiliary lip portion is the seal holding portion. Of the bearing is radially protruded so as to be located in the concave portion on the outer side of the bearing, and has a slope so as to approach the double-row roller bearing toward the tip. Is provided on the side surface on the side of the double-row roller bearing, and the inner peripheral surface on the radially outer side is in sliding contact with the cylindrical surface of the annular recess which is the cylindrical surface. As a result, in this railcar bearing device, the main lip portion and the auxiliary lip portion of the seal member are provided in the double row roller bearing between the seal retaining ring provided on the outer ring and the pair of sleeves provided on the axle. By sealing at two points of the part, it is tightly sealed and water and dust are prevented from entering the inside.

Further, since the tip of the main lip portion faces the inside of the bearing and is opposite to the direction in which the grease inside the bearing tends to leak out of the bearing, the main lip portion can effectively prevent the grease leakage.

The auxiliary lip portion of the sealing member is housed inside annular recesses provided in the rear lid and the front lid. Therefore, the outer dimensions are not increased, and the space for the bearing and the space for enclosing the lubricant are not reduced. Therefore, the axial dimension of this bearing device is shortened to reduce the size. Further, since the auxiliary lip portion has a forward gradient such that it approaches the roller bearing toward the tip, it can be smoothly assembled when the bearing device is assembled, and the auxiliary lip portion is inverted during assembly. There is nothing to do. Further, since the tip of the auxiliary lip portion is in sliding contact with the cylindrical surfaces of the recesses provided in the front lid and the rear lid, even if an axial assembly error occurs during the assembly of the bearing device, it is The sealing property is always secured. Further, an inner peripheral surface including the cylindrical surfaces of the rear lid and the front lid, a surface of the auxiliary lip portion on the double-row roller bearing side, and an outer surface of the seal retaining ring form an annular groove. Therefore, water such as rain from the outside is guided to the groove and flows downward. Therefore, water does not collect in the groove.

<Embodiment> Hereinafter, the present invention will be described in detail with reference to an illustrated embodiment.

In FIG. 1, 1 is an axle, which has a large diameter portion 2 and a small diameter portion 3.
It has the step part 4 formed by R surface between. The step portion 4 has an annular R surface 11 whose inner peripheral surface corresponds to the R surface of the step portion 4, and a conical surface 12 and a cylindrical surface 13 whose cross-section opens in a "C" shape in the direction of the large diameter portion 2. The rear lid 10 formed in step 1 is externally fitted with the R surface of the rear lid 10 in contact with the R surface of the step portion 4. As a result, an annular space 25a having a substantially wedge-shaped cross section is formed between the conical surface 12 and the cylindrical surface 13 and the R surface of the step portion 4 of the axle 1. The side surface 14 on the shaft end surface 5 side of the rear lid 10 has the above-mentioned side surface 14
Has a predetermined depth in the axial direction from the inner peripheral surface 15 on the radially outer side.
An annular recess 17 having a cylindrical surface 16 having a predetermined diameter is provided in the. The recess 17 is the cylindrical surface 16, a chamfered surface 18 provided between the cylindrical surface 16 and the side surface 14, a bottom surface 19 connected to the cylindrical surface 16, and a predetermined distance radially inward from the cylindrical surface 16. The inner peripheral surface 20 on the inner side in the radial direction and the end surface 21 that is parallel to the side surface 14 that is continuous with the inner peripheral surface 20 and that is parallel to the side surface 14 and are separated from the inner surface by a predetermined distance in the axial direction. An annular fitting portion 22 having a rectangular cross-section, one of which is open to the cylindrical surface 13 side, is provided at an edge portion on the radially inner side of the end surface 21. The rear lid 10 also has a grease supply hole 24 that radially penetrates at a predetermined position in the circumferential direction of the outer peripheral surface 23, and forms the space 25a formed on the outer peripheral surface 23 side and the conical surface 12 side. It is in communication.

The fitting portion 22 includes a cylindrical portion 26a and a fitting portion 26b,
Of the cylindrical portion 26a of the annular sleeve 26 having a substantially J-shaped cross section, in which the fitting portion 26b is closely fitted to the small diameter portion 3 of the axle 1,
The end portion 26c on the side opposite to the side where the fitting portion 26b is provided, that is, the large diameter portion 2 side is fitted. Cylindrical part of this sleeve 2
The inner diameter of 6a is larger than the diameter of the small diameter portion 3 of the axle 1 by a predetermined dimension, and therefore, between the cylindrical surface 26d of the cylindrical portion 26a and the outer peripheral surface 3a of the small diameter portion 3 of the axle 1. A cylindrical space 25b is formed in the. A radial hole 26e that communicates the space 25b with the outer peripheral surface side of the cylindrical portion 26a is provided at a predetermined position in the circumferential direction near the fitting portion 26b of the cylindrical portion 26a. As a result, the grease supplied from the grease supply hole 24 is supplied to the double row conical roller bearing described later through the space 25a, the space 25b and the hole 26e. An end surface of the sleeve on the fitting portion 26b side is externally fitted to the small diameter portion 3 of the axle 1 and has raceway surfaces 28a and 29a on its outer circumference, respectively, and a pair of inner rings 28 symmetrically arranged. 29, and an inner ring spacer 30 that is also fitted onto the small diameter portion 3 and is arranged between the pair of inner rings 28, 29, and a pair of raceway surfaces 31a, 31 on the inner circumference.
The outer race 31 having b and the inner races 28, 29 have raceways 28a, 29a, respectively.
, And the conical rollers 32, 32, ..., Which are mounted between the pair of raceways 31a, 31b of the outer ring at equal intervals in the circumferential direction.
The outer side of one inner ring 28 of the double-row conical roller bearing 34 constituted by cages 33, 33 for holding 32, 32, ... at equal intervals, that is, viewed from the axial center of the double-row conical roller bearing. Outer end face
28b is in contact. On the other hand, on the outer end surface 29b of the other inner ring 29 of the double-row conical roller bearing 34, a sleeve 35 having the same shape and size as the sleeve 26 is provided in the small diameter portion 3 of the axle 1 in the axially opposite direction to the sleeve 26. The end faces on the fitting portion 35b side are in contact with each other by being closely fitted and fitted. And the above-mentioned 1
0, the sleeve 26, the one inner ring 28, the inner ring spacer 30, the other inner ring 29, and the sleeve 35 face the step portion 4 of the axle 1 and the fitting portion 22 of the rear lid 10 in a substantially U-shaped cross section. Mating part 36
The double row conical roller bearing 34 is attached to the axle 1 by sandwiching the front lid 37 having a with the radial end surface 36a of the fitting portion 36 thereof. The front lid 37 has a cross-sectional shape on the double-row conical roller bearing 34 side of the rear lid 10, that is, a cross-sectional shape on the double-row conical roller bearing 34 side that is exactly the same as the shape of the recess 17 and the annular fitting portion 22 having a rectangular cross-section. have. The pinching is performed by inserting bolts 38, 38, 38 into axial bolt holes 37b, 37b, 37b provided at three predetermined positions in the bottom portion 37a of the front lid, which corresponds to the bottom of the U-shaped cross section of the front lid 37. Then, the axle 1 with the bolts 38, 38, 38 axially provided at the positions corresponding to the above three locations.
It is performed by screwing into the screw hole of the shaft end surface 5.

The front lid 37 has a predetermined gap between the inner surface 37c of the bottom portion 37a and the shaft end surface 5 of the axle in a screwed state, and a space 39 is formed therein. . The space 39 is a space 25 between the sleeve 35 and the small diameter portion 3.
It is a passage for grease supplied from a grease supply hole (not shown) provided in the front lid 37, communicating with b and the hole 35e. The outer ring 31 is fixed to the vehicle body side via the adapter A.

At the edges on both axial sides of the inner circumference of the outer ring 31 of the double-row conical roller bearing 34, the cylindrical surfaces 40a, 40a that are smooth cylindrical surfaces and the double-row conical roller bearings of the respective cylindrical surfaces 40a, 40a are provided. A fitting groove having a predetermined size and shape, which is provided at the end portion on the center side in the axial direction of 34 and is provided radially outward from the cylindrical surfaces 40a, 40a.
Mounting portions 40, 40 formed by 40b, 40b are provided. Each of the mounting portions 40, 40 has a ring-shaped member having a stepwise cross-section, has a smooth outer peripheral surface, and has a seal holding ring 41, which includes a large diameter portion 42 having elasticity, a small diameter portion 43, and a seal holding portion 44. 41 is fixed by fitting the large diameter portion 42. This fixing is performed by the enlarged diameter portion 42a of a predetermined size and shape provided at the end of the large diameter portion 42.
Is elastically fitted into the fitting groove 40b of the mounting portion (see the lower left of FIG. 1). At this time, since the outer peripheral surfaces of the cylindrical surface 40a and the large-diameter portion 42 are smooth, the cylindrical surface 40a and the outer peripheral surface of the large-diameter portion 42 in the fitted state are in complete contact with each other. In the fixed state, the axially outer surface 45a of the step portion 45 between the large diameter portion 42 and the small diameter portion 43.
Corresponds to the end surface 31c of the outer ring 1. The large-diameter portion 42 is provided with a small-diameter portion 43 projecting outward from the step portion 45 in the axial direction by a predetermined dimension, and further, from the end 43a of the small-diameter portion 43 toward the inner side in the radial direction, and has a brim shape. The seal holding portion 44 is provided so as to project. The diameter of the small diameter portion 43 is the same as that of the rear lid 10 and the front lid.
The cylindrical surfaces 16 of 37 are provided to have a predetermined size smaller than the predetermined diameter. The axial position of the outer side surface of the seal holding portion 44 coincides with the boundary line between the cylindrical surface and the chamfered surface of the front lid and the rear lid. Further, the inner peripheral end surface 44a of the seal holding portion 44 is parallel to the outer peripheral surfaces of the sleeves 26 and 35, and has a predetermined radial gap between the inner peripheral end surface 44a and the outer peripheral surface.

The seal members 46, 46 are provided at the tips of the seal holding portions 44, 44.
Is burned and attached. The sealing member 46 has a fitting portion 47 having a substantially J-shaped cross section, which has a fitting groove provided from the outside toward the inside in the radial direction so that the above-mentioned tip end fits.
And a main lip portion 48 provided at the inner end of the inner peripheral surface of the mounting portion 47, an annular spring 49, and an auxiliary lip portion 50 provided at the outer radial end of the mounting portion 47 ( (See bottom right of Fig. 1). The main lip portion 48 is provided below the inner end, has a substantially wedge-shaped cross section, and has a slope that becomes more distant from the double-row conical roller bearing 34 toward the tip.
48a and an outer peripheral groove 48-1 having a semicircular cross section formed on the outer peripheral surface of the main lip 48a so as to project from the inner side surface toward the inner side in the axial direction.
And a seal portion 48b having a seal 48b-2 formed on the inner peripheral surface with two surfaces forming a predetermined obtuse angle, and by mounting the annular spring 49 on the outer peripheral groove 48b-1,
The main lip 48a and the seal portion 48b are urged toward the inner side in the radial direction, and the tip of the main lip 48a and the seal 4 are
The outer peripheral surface 26f of the sleeve 26 is slidably contacted by being biased toward the inner side in the radial direction at the entire circumferences of two places at a predetermined distance from the ridgeline of the two surfaces forming the obtuse angle of 8b. On the other hand, the auxiliary lip portion 50 has a cylindrical flange portion 50a projecting a predetermined length from the outer radial outer end of the mounting portion 47 toward the axial outer side, and the end portion 50a-1 of the flange portion. From the annular lip base portion 50b that is provided to project radially outward from the end portion 50b-1 of the lip base portion, and a gradient that approaches the double-row conical roller bearing toward the tip 50c-1. The auxiliary lip 50c is provided, and the tip end 50c-1 is slidably in contact with the cylindrical surfaces 16, 16 of the recesses 17, 17 of the rear lid 10 and the front lid 37 by the elasticity of the seal member 46 itself.

In the railcar bearing device having the above configuration, when the axle 1 rotates, the rear lid 10, the front lid 37, the pair of sleeves 26 and 35, the pair of inner rings 28 and 29 of the double row conical roller bearing 34, and the inner ring spacer 30 are separated. Rotate together. On the other hand, the outer ring of the double row conical roller bearing 34
31, a pair of seal retaining rings 41, 41 attached to the mounting portions 40, 40 on both sides in the axial direction of the outer ring 31, and the seal retaining portions 44, 44 of the seal retaining rings 41, 41 are baked with their mounting portions 47, 47. The respective fixed sealing members 46, 46 are stationary. The main lip portion 48 composed of the main lip 48a of the seal member 46 and the seal portion 48b having the seal 48b-2 is directed inward in the radial direction by the spring 49 fitted in the outer peripheral groove 48b-1 of the seal portion 48b. When urged, the tip of the main lip 48a and the seal 48b are
-2 on the outer peripheral surfaces 26f, 35f of the sleeves 26, 35 rotating with the axle 1 at the two circumferences at a predetermined axial distance from the ridgeline formed by the two obtuse angles. Make sliding contact. On the other hand, a flange portion 50a protruding outward from the outer radial direction of the mounting portion 47 toward the outer side in the axial direction, and an end portion 50b-1 of the flange portion 50a protruding outward from the radial direction. A lip base portion 50b and an auxiliary lip which is provided in a radial direction at the end portion of the lip base portion 50b and has a gradient so as to approach the double-row conical roller bearing toward the tip 50c-1.
The auxiliary lip 50c of the auxiliary lip portion 50 consisting of 50c,
The double row conical roller bearing 34 of the front lid 10 and the rear lid 37 is urged radially outward by the elasticity of the seal itself,
The cylindrical surfaces 16 and 16 provided on the inner peripheral surfaces 15 and 15 on the radially outer side of the recesses 17 and 17 provided on the side surfaces 14 and 14 on the side, respectively. As a result, in this railcar bearing device, the inside of the double-row conical roller bearing 34 is provided with the pair of seal retaining rings 41, 1 provided on the outer ring 31.
4 and the pair of sleeves 26, 35 closely fitted to the axle 1 by the fitting portions 26a, 35b, respectively, and the seal member 46,
46 main lips 48, 48 main lips 48a, 48a and seals 48b,
Seals 48b-2 and 48b-2 are sealed at two places, that is, at a total of four places on both sides, and in addition to the main lip portions 48, 48, the passage of water or the like indicated by arrow B in the figure The pair of seal retaining rings 41, 41 on the upstream side, and the rear lid 10
And the inner peripheral surface 1 on the radially outer side of the respective recesses 17, 17 of the front lid 37
Between the cylindrical surfaces 16 and 16 provided on 5, 15 the sealing member 46,
The mounting portion 47, 47 of the 46 is provided so as to project radially outward through the flange portions 50a, 50a and the lip base portions 50b, 50b, and the tip 5
Double row conical roller bearings 3 as they go toward 0c-1 and 50c-1
Tip of auxiliary lips 50c, 50c with a slope that approaches 4
50c-1 and 50c-1 tightly seal the entire circumference. That is, the main lip portion 48a of the main lip portion 48 on one side
And seal 48b-2 and auxiliary lip 50c of auxiliary lip portion 50
It is tightly sealed at 3 points on the tip 50c-1 and 6 points on both sides. Therefore, even if the bearing device for a railway vehicle is used in the special area as described above, water or dust does not enter the double-row conical roller bearing 34. The seal portions 48b of the main lip portions 48, 48 are provided so as to project inward in the axial direction, and extend in the direction opposite to the direction in which the grease inside the conical roller bearing 34 tends to leak out of the conical roller bearing 34. Therefore, the main lip portions 48, 48 can effectively prevent the grease from leaking. Further, the main lip parts 48, 48 are the seal holding parts 4
While located on the inner side of the bearing of 4,44, the auxiliary lip 50,50
Is located on the outer side of the bearing of the seal holding portions 44, 44, it is possible to avoid radial overlap of the main lip portions 48, 48 and the auxiliary lip portions 50, 50, and the radial dimension of this bearing device. Can be avoided. Further, on both sides of the double-row conical roller bearing 34, respectively, the small diameter portion 43 of the seal retaining ring 41, the outer side of the seal retaining portion 44, the axially outer end surface of the mounting portion 47 of the seal member 46, and the flange portion 50a. The outer peripheral surface of the lip base portion 50b, the side surface of the lip base portion 50b on the seal holding ring 41 side and the side surface of the auxiliary lip 50c on the seal holding ring 41 side, and the cylindrical surface 16 and the chamfered surface 18 of the recess 17 form an annular groove. Since the water is formed, the water entering the groove as indicated by arrow B in the figure can be guided along the groove by gravity and flow down, so that the water does not collect in the groove. Further, since the chamfered surface 18 and the cylindrical surface 16 co-rotate with the axle 1, the water flowing in the groove and reaching that portion is repelled by centrifugal force to smoothly flow along the chamfered surface. Can be discharged to the outside. Since the auxiliary lip portion 50 of the seal member 46 is completely housed in the annular recesses 17, 17 provided in the rear lid 10 and the front lid 37, it does not cause an increase in the axial dimension, and Therefore, the space of the roller bearing 34 and the space for enclosing the lubricant inside the seal members 46, 46 in the axial direction are not reduced. Further, the axial dimension of this bearing device can be shortened. Further, since the auxiliary lip 50c of the auxiliary lip portion 50 has a gradient such that it approaches the double-row conical roller bearing toward the tip 50c-1, the gradient is forward when the bearing device is assembled. Therefore, the auxiliary lip 50c can be assembled smoothly and the auxiliary lip 50c does not reverse during assembly. Further, the seal member 46 is provided with the main lip portions 48, 4
8 slides on the outer peripheral surfaces 26f, 35f of the sleeves 26, 35, and the auxiliary lips 50b, 50b of the auxiliary lip portions 50, 50 slide on the cylindrical surface 16 provided on the radially outer side of the recess 17 of the rear lid 10, respectively. Seal it. In other words, since both the main lip portions 48, 48 and the auxiliary lip portions 50, 50 of the seal member 46 are in sliding contact with the cylindrical surface in the axial direction for sealing, even if an assembly error occurs during assembly of the bearing device, The sealability can always be secured regardless of assembly error.

<Effect of the Invention> As is apparent from the above, the bearing device for a railway vehicle according to the present invention has the seal holding portions, one end of which is fixed to both sides of the outer ring of the double row roller bearing and the other end of which extends in the radial direction. A pair of seal retaining rings, a sleeve that is provided between a rear lid that is fitted to a step portion of the axle and a front lid that is provided at an end portion of the axle, and that supports both sides of the double-row roller bearing; Provided on the side surface of the double-row roller bearing side of the rear lid and the front lid,
An annular recess whose inner circumferential surface on the radially outer side is a cylindrical surface and a holding portion of the seal holding ring are provided, and the main lip portion is located on the inner side of the bearing of the seal holding portion and the outer circumferential surface of the sleeve. The auxiliary lip portion is provided radially outward so as to be located inside the recess on the bearing outer side of the seal holding portion, and the double row roller is provided toward the tip. Since it has a seal member that has a slope that approaches the bearing and that is in sliding contact with the cylindrical surfaces of the rear lid and the front lid, the inside of the double row roller bearing that rotatably supports the axle is The main lip portion of the seal member seals between the holding portion of the seal holding ring and the outer periphery of the sleeve, and further, the seal holding portion of the pair of seal holding rings, which is on the upstream side of the entry path of water and the like, and the above Back cover and Between the cylindrical surface of the lid to seal the auxiliary lip may be completely sealed,
Therefore, even when used in a special area such as an area with a large amount of rainfall or a desert area with a large amount of dust, water, dust, etc. do not enter the double-row roller bearing and reduce the life of the bearing.

Further, since the tip of the main lip portion extends toward the inside of the bearing and extends in the direction opposite to the direction in which the grease inside the bearing tries to leak to the outside of the bearing, the effect that the main lip portion prevents the leakage of grease. Can be powerful.

Further, since the main lip portion is located on the bearing inner side of the seal holding portion, while the auxiliary lip portion is located on the bearing outer side of the seal holding portion, the main lip portion and the auxiliary lip portion are in the radial direction. Can be avoided, and an increase in the radial dimension of the bearing device can be avoided.

Further, in the railcar bearing device of the present invention, since the auxiliary lip portion of the seal member can be housed in the recesses of the rear lid and the front lid, the outer dimensions are not increased, and The sealability is high, the life can be extended, and the axial dimension of the bearing device can be made compact without reducing the bearing space and the space for enclosing the lubricant.

Further, the bearing device for a railway vehicle of the present invention has a "retaining" by the side surface of the seal retaining ring and the auxiliary lip portion of the seal member on the double row roller bearing side and the cylindrical surface which is the radially outer inner peripheral surface of the recess. Since the "-shaped annular groove is formed, water such as rain that has entered this portion can be guided downward along the annular groove and flow down, so that water may accumulate near the auxiliary lip. There is no.

Further, the bearing device for a railway vehicle according to the present invention is provided in the rear lid and the front lid, and the seal member which is provided in a radial direction and has an auxiliary lip portion having a gradient so as to approach the double row roller bearing toward the tip. The inner peripheral surface on the outer side in the radial direction is provided with an annular recess which is a cylindrical surface, so that even if an axial assembly error occurs during assembly of the bearing device, the seal in the double row roller bearing is always stable. It is possible to secure the sex. Further, since the auxiliary lip portion has a slope that approaches the double row roller bearing toward the tip, when assembling the bearing device,
There is no flipping.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of a vehicle bearing device of the present invention, and FIG. 2 is a vertical sectional view of a conventional vehicle bearing device. DESCRIPTION OF SYMBOLS 1 ... Axle, 4 ... Step, 10 ... Rear lid, 14 ... Side, 16 ... Inner peripheral surface, 17 ... Annular recess, 26,35 ... Sleeve, 26f, 35f ... Outer peripheral surface, 31 ... Outer ring, 34 ... Compound Row conical roller bearings, 37… Front lid, 41…
Seal retaining ring, 44 ... Seal retaining portion, 46 ... Seal member, 48
... Main lip part, 50 ... Auxiliary lip part, 50c-1 ... Tip.

Claims (1)

[Scope of utility model registration request] 1. A rear lid fitted to a step portion of an axle, a front lid provided at an end portion of the axle, and a double row in which sleeves are arranged on both sides between the rear lid and the front lid. A roller bearing, a pair of seal retaining rings each having one end fixed to both axial sides of the outer ring of the double-row roller bearing, and the other end having a seal retaining portion extending in the radial direction, and a seal retaining ring of the seal retaining ring. A bearing device for a rail vehicle provided with a seal member for sealing the inside of the double row roller bearing together with the seal retaining ring, wherein the rear lid and the front lid have side surfaces on the double row roller bearing side. Is
An annular recess whose inner peripheral surface on the radially outer side is a cylindrical surface is provided, and the seal member is located on the bearing inner side of the seal holding portion and is in sliding contact with the outer peripheral surface of the sleeve, and the tip is a bearing. A main lip portion facing inward, and a radial projection projecting so as to be located in the recess on the bearing outer side of the seal holding portion, and having a gradient approaching the double-row roller bearing toward the tip, A bearing device for a rail vehicle, wherein the tip includes an auxiliary lip portion that is in sliding contact with the cylindrical surface in the concave portion of the rear lid and the front lid.