JPS60249726A - Bearing device for axle - Google Patents

Abstract

PURPOSE:To improve the lubrication to a series of rollers at the rear cover side by making a grease supply hole at the side of large diameter section of a rear cover having a gap against the axle while directing from the outer diameter toward the gap and forming a path communicating from the gap to the interior of bearing at the bearing side. CONSTITUTION:An oil seal 105 is fitted at the step section 1042 provided at the end of outer ring 104 of bearing while the innercircumference of the lip 1051 of oil seal 105 will contact with the opposite ends of inner ring 101 thus to contact with a flange ring 1031 fitted to the shaft end side of axle 102 and the outercircumferential face 106 of a rear cover 106 fitted to the opposite side and to seal the bearing. The inner diameter at the side of large diameterf section of rear cover 106 is fitted to the axle 102 thus to seal the interior of bearing tightly while a gap is provided between the inner diameter at the bearing side and the axle 102. A grease supply hole 108 directing from the outer diameter toward the gap 1067 is made at the side of large diameter section while a path 303 communicatable from the gap 1067 to the interior of bearing is formed at the bearing side.

Description

TECHNICAL FIELD The present invention relates to an axle bearing device, particularly to an axle bearing device for a railway vehicle.

"Prior Art" As shown in Figures 4 and 5, # is placed on the end of the axle shaft.
The front cover 1'(11'' is fixed through the front cover 1'(11'' or 8- or pol) 1-, and the grease filled by the grease nipple 2 attached directly or indirectly to the substantially central shaft of the front cover 1 is distributed between the front cover l and the axle end. After that, the grease is fully packed into the space through the grease hole 31 of the ring 3, and then the inner and outer rings 6.
7, that is, the inside of the bearing in which the cylindrical rollers 4.4 roll is replenished.

By replenishing the grease, the air inside the bearing becomes
For example, discharging the rice to the outside from a tray 8 provided on the rear cover 5 fitted to the shoulder on the end side is described in Japanese Utility Model Publication No. 46-20980.
This method is disclosed in Japanese Utility Model Publication No. 10646/1983.

However, since the space between the front cover and the end of the axle is relatively large, the grease filled through the grease nipple is only refilled inside the bearing after the space is fully backed up, so the amount of grease replenishment is limited. This requires more space, and at the same time, the grease on the shaft end must be wiped off each time during wheel milling or shaft flaw detection, resulting in an increase in grease consumption.

Since a plastic plate is attached to the housing and rear cover, the outer diameter of the rear cover is larger than the wheel boss diameter (inner diameter), which becomes an obstacle when replacing the wheel and causes damage to the inner ring (bearing). Rear lid t
It cannot be replaced unless it is removed.

This is one of the bottlenecks in periodic inspections and wheel replacements after driving for a certain period of time, and is considered one of the factors contributing to high costs.

``Object of the Invention'' The technical problem of the present invention is to ensure that grease is sufficiently supplied between the rollers of a double-row rolling bearing, especially the row of rollers on the rear cover side, and that the rear cover is equipped with a grease replenishment hole plug for filling grease. To provide a bearing device for an axle in which the outer diameter of the large diameter part of the axle is formed to be small, thereby speeding up the replacement of wheel tires and further improving work efficiency.

"Structure of the Invention" The structure of the present invention that solves all of the above technical problems is as follows.

The rear cover located on the large diameter side of the axle and the full shaft end of the axle
In an axle bearing device comprising a front cover disposed in the front cover and a double row rolling bearing fitted to the shaft end of the axle between the front cover and the rear cover, the rear cover is annular and includes a bearing. The inner diameter of the side has a gap between it and the axle, a grease supply hole is formed on the large diameter side from the outer diameter toward the gap, and a passage leading from the gap to the inside of the bearing is formed on the bearing side. The front cover is equipped with a vent that communicates with the outside air from the air gap, and a vent is installed between the front cover and the inner ring of the bearing, and a vent that communicates from the inside of the bearing with the air gap formed between the axle and the front metal ring is installed between the front cover and the inner ring of the bearing. A bearing device for an axle characterized in that a passage is formed therein, and a second invention include a rear cover disposed on the large diameter side of the axle and a front cover disposed on the shaft end side of the axle. , an axle bearing device comprising a double-row rolling bearing fitted to the end of the axle between the front cover and the rear cover, the rear cover is annular, and the inner diameter of the bearing side is the same as that of the axle. A gap is formed in between, a grease supply hole is formed on the large diameter side from the outer diameter toward the gap, and a passage leading from the gap to the inside of the bearing is formed on the bearing side. The axle bearing device is characterized in that the outer diameter of the diameter portion is smaller than the outer diameter of the wheel fitting portion of the axle, and the inner diameter of a portion of the large diameter portion is fitted to the axle.

[Effects of the Invention] With the above-described configuration, the necessary amount of grease can be replenished to the base through the grease supply hole in the rear cover, thereby eliminating waste and reducing the total amount of grease consumption.

In particular, the roller row on the opposite shaft end (rear cover side) is sufficiently coated with grease, making it extremely effective as a type of bearing device in which the thrust load of the axle is carried by the roller row on the opposite shaft end of the double-row cylindrical roller bearing. .

In addition, when replacing a worn out wheel, the outer diameter of the rear cover is smaller than the inner diameter of the wheel, so the entire wheel can be removed by climbing over the rear cover and inner ring.

Therefore, the work to pull it out from the rear cover on the opposite shaft end and the inner wheel upper axle becomes tedious, and the work time is significantly shortened, which further improves the work efficiency.

Embodiment An embodiment of the present invention will be described in detail below with reference to FIGS. 11 to 3 of the accompanying drawings.

FIG. 1 is a sectional view of an axle bearing device according to an embodiment of the present invention.

Note that only the upper half of this device is illustrated along the axis of the axle, and the lower half is omitted from illustration and explanation because it has a symmetrical structure.

FIG. 2 is an enlarged sectional view of a main part on the opposite shaft end side of FIG. 1, and FIG. 3 is an enlarged sectional view of an oil seal portion.

Reference numeral 101 denotes an inner ring of nine bearings that all rotate in parallel, and the inner ring 101 is tightly fitted to the axle 102, and one end face side, that is, the opposite end side Vcr of the axle 102, has a portion 1011 d.
i It is formed in one piece, and a ring 103 is attached to the other road surface side, that is, the shaft end side, in contact with the end surface of the inner ring 101. 104 is an outer ring, and the width center of the inner periphery and the 5 opposite shaft end are attached. (The collar part 1041k is biased toward R11 and receives the thrust load from the roller row on the opposite shaft end side, and the stepped part 104 is on both ends of the collar part 1041k.
2 is formed, and an oil seal 105 is fitted into the step 51042.

The inner periphery of the lip 1051 of the oil seal 105 touches both ends of the inner ring 1010, and the outer circumferential surface 1031 of the rear cover 106 is fitted to the one wheel 1031 fitted to the axial end of the first axle 102 and to the opposite axial end, 1061 K to seal the bearing. The rear wall 106 is annular, and the inner diameter on the large diameter side fits into the axle 102 and tightly seals the inside of the bearing, and the inner diameter on the bearing side has a space between it and the axle 102. A grease replenishment hole 108 is formed on the large diameter side from the outer diameter side toward the gap 1067, and a passage 303 leading from the gap 1067 to the inside of the bearing is formed on the bearing side.

The seal ring 103 disposed between the front cover 107 and the inner ring 101 of the bearing has the front cover 1 removed from inside the bearing.
A passage 1032 is formed that communicates with the air space 13A 1033 formed between the space 13A and 07.

A cover 109 fitted into the front lid 107 is formed with a vent that communicates with the outside air from the gap 1033, and a vent 110 is attached to the bed hole 1091. A labyrinth portion 1065 is formed with a slight gap between the drain 1064 of the oil seal 105 that is in contact with the outer circumferential surface 1061 of the rear lid 106 and the outer circumferential surface 1063 of the rear cover 106 on the large diameter portion 113 side. 1064
A notch 1066 is formed in a portion of the hole.

The notch 1066 serves as a grease replenishment hole 10 for replenishing the rear cover 106 while maintaining the labyrinth function.
Grease can be replenished into the inside of the bearing from 8.

In addition, the code 1081 is a Vimi grease feed hole plug.

The outer diameter (outer peripheral surface 1063) of the rear cover 106 is the same as the axle 102.
The outer diameter of the fitting portion is smaller than the diameter of the large diameter portion 113.

Reference numeral 115 denotes a retaining ring fitted into a circumference #l 1161 formed on the reduced diameter portion 116 on the shaft end side of the axle 102, and the outer diameter of the retaining ring 115 is equal to the outer diameter of the collar 1 fitted into the reduced diameter portion.
It is in contact with the inner circumferential surface of the protrusion 17.

Screw holes 1171 are formed at required locations in the collar 117.

' A bolt insertion hole 1071 is formed that is located on the axis gsfIll of the axle 102 of the front cover 107 and corresponds to the screw hole 1171 of the collar 117, and an annular step is formed in the radial direction of the front cover 107. and the step part has a ring 1
03 is in contact with the end surface on the shaft end side.

Numeral 118 is a bolt that is tightened through bolt insertion hole 1 of the front cover 107.
071 through the anti-rotation member 119, and then screwed into the screw hole 1171 of the collar 117.

120 is a cylindrical roller arranged in double rows between the inner and outer rings 101 and 104, 121 is a cage, and 122 is a double row roller 120
This is the guide wheel located between 120 and 120.゛"Function" When a predetermined amount of grease is press-fitted into the grease supply hole 108 of the rear cover 106 using a grease gun (not shown), the grease is supplied to the inside of the bearing through the passage 303 through the gap 1067. .

At the same time as replenishing grease, the air inside the bearing is removed from the front cover 107.
side pen) 110 J: Exhausted (air vented) to the outside.

``Effect'' With conventional grease, the space between the relatively large front cover and the end of the axle was filled with grease inside the bearing, but when replenishing from the rear cover, excess grease enters the bearing. Grease can be removed to a minimum.

In addition, the grease is sufficiently distributed to the row of rollers on the opposite end of the shaft, making it an extremely effective grease replenishment system, especially for bearing systems in which the thrust load of the axle is carried by the row of rollers on the opposite end of a full double-row cylindrical roller bearing. . Next, regarding the operation of the second invention, when pulling out a worn wheel (not shown) to replace it with a completely new one, remove the front cover, collar, and lever ring, then remove the outer ring, oil seal, and Remove the roller row.

Since the outer diameter Da of the rear cover is smaller than the outer diameter DA of the large diameter portion, the wheel can be pulled out to the shaft end side by passing over the rear cover and the inner ring, leaving the rear cover as it is. Therefore, flaw detection of the axle and wheel replacement, which are carried out after running for a predetermined period of time, can be carried out quickly, reducing work time and further improving work efficiency.

[Brief explanation of the drawing]

1 is a partially omitted half-cut sectional view of the device of the present invention, FIG. 2 is an enlarged sectional view of the main part of the device of the present invention, FIG. 3 is an enlarged sectional view of the oil seal portion of the device of the present invention, and FIGS. FIG. 5 is a sectional view showing a known example of an axle bearing till.

Claims (2)

[Claims] (1) A rear cover disposed on the large diameter side of the axle, a front cover disposed on the axle end side, and the front cover and the rear cover are fitted onto the axle end of the axle. In an axle bearing device consisting of a double-row rolling bearing, the rear cover is annular, the inner diameter on the bearing side has a gap between it and the axle, and the large diameter portion 1111 has grease flowing from the outer diameter toward the gap. A replenishment hole is formed, a passage leading from the gap to the inside of the bearing is formed on the bearing side, and the front cover is attached with a belt that communicates with the outside air from the gap, and a passage between the front cover and the inner ring of the bearing is formed. A bearing device for an axle having a t-% characteristic in which a passageway communicating from the inside of the bearing to a gap formed between the axle and the front cover is formed in the retaining ring disposed in the axle. (2) A rear cover disposed on the large diameter side of the axle, a front cover disposed on the shaft end side of the axle, and a space between the front cover and the rear cover that is fitted onto the shaft end of the axle. In an axle bearing device comprising a double-row rolling bearing attached to the rear cover, the rear cover is annular, the inner diameter on the bearing side has a gap 1 between it and the axle, and the large diameter side has a gap 1 from the outer diameter to the gap. A grease supply hole is formed on the opposite side, and a passage leading from the gap to the inside of the bearing is formed on the bearing side, and furthermore, the outer diameter of the large diameter side of the rear cover is larger than the outer diameter of the wheel of the axle and the fitting part. An axle bearing device characterized in that the tube is formed small and a part of the inner diameter on the large diameter side is fitted into the axle.