JP2577842Y2 - Constant preload double row tapered roller bearing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant-load double-row tapered roller bearing device having an improved structure for mounting a constant-preload spring.

[0002]

2. Description of the Related Art Conventionally, as a constant preload type double row tapered roller bearing device, as shown in FIG. 4, an inner ring 1, double row tapered rollers 2,2, outer rings 3,3, and outer rings 3,3. And a seal cover 4, 4 opposed to the end faces 3a, 3a, and supporting the shaft 5a of the roll 5 with the inner ring 1 has been proposed (see Japanese Utility Model Laid-Open No. 57-115424).

[0003] A constant preload spring 6, 6 is fitted into an axial hole 4a formed in an inner side surface 4b of the seal cover 4 so as to abut against the end surfaces 3a, 3a of the outer races 3,3. The outer ring 3 (left side in FIG. 4) on the non-load side is restrained by the non-rotating seal cover 4 by the preload spring 6 so that the outer ring 3 on the non-load side does not rotate with the inner ring 1 and the tapered rollers 2. ing.

[0004]

However, in the above-described conventional bearing device, the axial hole 4a of the seal cover 4 is provided.
Since there is a gap for assembling between the constant preload spring 6 and the constant preload spring 6, the constant preload spring 6 may fall down in the axial hole 4a and be inclined with respect to the axial direction. In this case, the spring preload amount of the spring 6 against the outer ring 3 is insufficient, the pressing of the outer ring 3 against the tapered rollers 2 is insufficient, and the outer ring 3 slides with the tapered rollers 2, causing damage to the bearing device. There is a problem of inviting.

Further, since the tip of the constant preload spring 6 directly contacts the end face 3a of the outer race 3, there is a problem that the surface pressure on the end face 3a fluctuates depending on the processing accuracy of the tip.

Further, the constant preload spring 6 includes a seal cover 4.
Although a certain amount of grease or the like is adhered to the axial hole 4a, when the roll cover 4 of the bearing device is lifted by a crane or the like in order to attach and detach the bearing device to and from the roll 5, the constant preload spring 6 There is also a problem that it is easy to fall off from the axial hole 4a of 4 and workability such as assembly and maintenance is poor.

Accordingly, an object of the present invention is to improve the assembling structure of the constant preload spring, to prevent the spring from falling down, to secure a constant surface pressure on the outer ring on the non-load side, and to improve the workability during assembly. It is an object of the present invention to provide a constant preload double row tapered roller bearing device.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the invention according to claim 1 is directed to an inner ring, a double row tapered roller, an outer ring, and opposed to the end faces of the outer ring and facing the end faces. A seal cover provided with an axial hole that is opened by opening, a spring holder press-fitted into the axial hole provided in the seal cover and having a stopper portion, a constant preload spring fitted into the spring holder, and the spring Fit into the holder,
The spring is biased by the constant preload spring to protrude axially from the spring holder so as to contact the end surface of the outer race, and engages with the stopper portion of the spring holder when protruded axially by a predetermined dimension. And a plunger that is prevented from projecting in the axial direction exceeding the predetermined dimension.

[0009] The invention according to claim 2 provides an inner ring,
A double row tapered roller, an outer ring, a seal cover provided with an axial hole facing the end face of the outer ring and opening toward the end face, and a constant preload fitted in the axial hole provided in the seal cover. And a plunger fitted in the axial hole, urged by the constant preload spring, protrudes in the axial direction from the seal cover and abuts on the end surface of the outer race, and is fixed to the axial hole. A stopper is provided which engages with the plunger when the plunger protrudes by a predetermined dimension in the axial direction, and stops the plunger from projecting in the axial direction exceeding a predetermined dimension.

[0010]

According to the first aspect of the present invention, the constant preload spring is fitted into the spring holder to always urge the plunger in the axial direction, and the plunger is stopped by the stopper portion of the spring holder. As a result, the protrusion in the axial direction exceeding the predetermined dimension is suppressed. That is, since the constant preload spring always projects in the spring direction in the spring holder in the axial direction with respect to the plunger and the axial hole, the spring does not fall in the spring holder, that is, in the axial hole. Wear creep of the outer ring due to insufficient spring preload is prevented, and damage to the bearing device is prevented.

The constant preload spring itself does not abut against the outer race, and the plunger biased by the constant preload spring abuts against the end surface of the outer race. Therefore, the surface pressure applied to the end surface is reduced by the constant preload. A constant surface pressure against the end surface of the outer race can be secured without being affected by the processing accuracy of the tip of the spring itself.

Further, a constant preload spring and a plunger are incorporated in a spring holder which is press-fitted into an axial hole of the seal cover, and the plunger protrudes in the axial direction by a predetermined dimension from the seal cover. At this time, since the protrusion in the axial direction exceeding the predetermined dimension is prevented by engaging with the stopper portion of the spring holder, the constant preload spring, the plunger and the like may fall off from the axial hole of the seal cover. And workability at the time of assembling and the like is improved.

According to the second aspect of the present invention, the constant preload spring and the plunger are fitted into the axial hole of the seal cover, and the constant preload spring always urges the plunger in the axial direction. The plunger is prevented from projecting in the axial direction exceeding a predetermined dimension by a stopper fixed to the axial hole of the seal cover. That is, since the constant preload spring always projects in the axial direction with respect to the plunger and the axial hole in the axial hole, the constant preload spring does not fall in the axial hole. The outer ring is prevented from creeping due to the insufficient spring preload due to the fall, and damage to the bearing device is prevented.

The constant preload spring itself does not contact the outer ring, and the plunger biased by the constant preload spring contacts the end surface of the outer ring, so that the surface pressure applied to the end surface is constant preload. A constant surface pressure against the end surface of the outer ring can be secured without being affected by the processing accuracy of the tip of the spring itself.

Further, the plunger urged by the constant preload spring engages with a stopper fixed to the axial hole when the plunger projects in the axial direction beyond the seal cover by a predetermined dimension. Since the protrusion in the axial direction exceeding the dimension is restrained, there is no possibility that the constant preload spring or the plunger will fall out of the axial hole, thereby improving workability at the time of assembling and the like.

Further, since a spring holder is not required, the constant preload spring can be mounted in the axial hole of the seal cover even when there is not enough space in the seal cover.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 shows an assembly structure of a constant preload spring of the bearing device of the first embodiment. The parts having the same configuration and operation as those of the prior art in FIG. 4 are denoted by the same reference numerals, and detailed description is omitted.

A cylindrical spring holder 10 is press-fitted into an axial hole 4a provided in an inner side surface 4b of the seal cover 4, and an inner flange-shaped inner end surface of the spring holder 10 A stopper 10a is formed.

In the spring holder 10, a constant preload spring 11 and a plunger 12 are fitted. The plunger 12 has a head portion 12a with which one end of the constant preload spring 11 abuts, and a shaft portion 12b protruding outside from an opening 10b on the stopper portion 10a side of the spring holder 10.
It is composed of

The plunger 12 is urged in the axial direction by the constant preload spring 11 so that the shaft portion 12b comes into contact with the end surface 3a of the outer race 3. Further, the plunger 12 is mounted on the shaft 1.
When the protrusion 2b protrudes from the opening 10b by a predetermined dimension, the head portion 12a contacts the stopper 10a of the spring holder 10, and the protrusion in the axial direction exceeding the predetermined size is restrained.

When the bearing device is mounted on the roll 5, the plunger 12 is fitted into the spring holder 10 and then the spring 11 is fitted with the constant preload spring 11.
0 is pressed into the axial hole 4a of the seal cover 4.

As a result, the other end of the constant preload spring 11 comes into contact with the bottom of the axial hole 4a to be reduced, and the plunger 12 is urged at one end. The shaft portion 12b of the plunger 12 abuts on the end surface 3a of the outer ring 3, and the outer ring 3 is restrained by the seal cover 4 so that the outer ring 3 on the non-load side does not rotate together with the inner ring 1 and the tapered rollers 2. .

In the bearing device, the constant preload spring 11 is fitted into the spring holder 10 and
The plunger 12 is always urged in the axial direction, and the plunger 12 is stopped by the stopper portion 10a of the spring holder 10.
As a result, the protrusion in the axial direction exceeding the predetermined dimension is suppressed. That is, since the constant preload spring 11 always projects in the axial direction with respect to the plunger 12 and the axial hole 4a in the spring holder 10, it may fall in the spring holder 10, that is, in the axial hole 4a. Without
Wear of the outer race 3 due to insufficient spring preload due to spring fall can be prevented, and damage to the bearing device can be prevented.

The constant preload spring 11 itself does not contact the outer ring 3, and the plunger 12 urged by the constant preload spring 11 contacts the end face 3 a of the outer ring 3. The surface pressure applied to the end surface 3a is not affected by the processing accuracy of the distal end portion of the constant preload spring 11 itself, and a constant surface pressure on the end surface 3a of the outer race 3 can be secured.

Further, the axial hole 4 of the seal cover 4
a constant preload spring 11 in a spring holder 10 which is press-fitted into a
When the plunger 12 projects in the axial direction beyond the seal cover 4 by a predetermined dimension, the plunger 12 engages with the stopper portion 10a of the spring holder 10 to exceed the predetermined dimension. Since the protrusion in the axial direction is suppressed, the constant preload spring 11, the plunger 12, and the like do not drop from the axial hole 4a of the seal cover 4, and the workability at the time of assembling and the like is improved.

FIG. 2 shows an assembly structure of a constant preload spring of the bearing device of the second embodiment. The second embodiment differs from the first embodiment only in that the plug 13 is press-fitted into the inner end of the inner peripheral surface of the spring holder 10.

According to this embodiment, the plunger 12 and the constant preload spring 11 are pre-installed in the spring holder 10, and the spring holder 10, the plunger 12 and the constant preload spring 11 can be unitized. Axial hole 4a
The work of assembling the spring holder 10, the spring 11, and the plunger 12 into the spring can be easily performed. The plug 13 may be screwed without being pressed into the inner end of the spring holder 10.

FIG. 3 shows an assembly structure of a constant preload spring of the bearing device of the third embodiment. The plunger 14 according to the third embodiment includes a hollow head 14a with which one end of the constant preload spring 11 contacts, and an axial hole 4a of the seal cover 4.
And a hollow shaft portion 14b that fits into the shaft portion 1.
A bolt hole 14c is formed at the bottom of 4b. And
The spring of this embodiment is assembled by inserting a constant preload spring 11 into the axial hole 4a of the seal cover 4 and then inserting a stopper bolt 15 into the bolt hole 14c with the plunger 14 inserted. It is completed by screwing it to the bottom of the direction hole 4a.

The constant preload spring 11 has the other end in contact with the bottom of the axial hole 4a and one end in the head 1 of the plunger 14.
4a. The head 14a of the plunger 14 is urged in the axial direction by the spring 11 to abut against the end face 3a of the outer ring 3, and restrains the outer ring 3 with the seal cover 4 so that the outer ring 3 does not follow the tapered rollers 2.

In the bearing device of the above embodiment, the constant preload spring 11 and the plunger 1 are inserted into the axial holes 4a of the seal cover 4.
4, the constant preload spring 11 always urges the plunger 14 in the axial direction, and the plunger 14
The protrusion in the axial direction exceeding a predetermined dimension is restrained by a stopper bolt 15 fixed to the axial hole 4a of the seal cover 4. That is, since the constant preload spring 11 always projects in the axial direction in the axial hole 4a, the constant preload spring 11 does not fall in the axial hole 4a, and the amount of spring preload caused by the fall of the spring. Outer ring 3 due to shortage
Wear creep can be prevented, and damage to the bearing device can be prevented.

The constant preload spring 11 itself does not abut against the outer race 3, and the plunger 14 urged by the constant preload spring 11 abuts against the end surface 3 a of the outer race 3. The applied surface pressure is not affected by the processing accuracy of the tip of the constant preload spring 11 itself, and a constant surface pressure on the end surface 3a of the outer race 3 can be secured.

When the plunger 14 projects by a predetermined dimension in the axial direction, the stopper bolt 15 engages with the stopper bolt 15 screwed into the axial hole 4a to exceed the predetermined dimension. Since the protrusion in the axial direction is restrained, the constant preload spring 11 and the plunger 14 do not drop from the axial hole 4a, and the workability at the time of assembling and the like is improved.

Further, since the bearing device does not require the spring holder 10 which was required in the first and second embodiments, the axial direction of the axial hole 4a of the seal cover 4 is smaller than in the first and second embodiments. The inner diameter can be reduced, so that the constant preload spring 11 can be mounted on the seal cover even when there is not enough space in the seal cover 4.

[0034]

As is clear from the above description, in the bearing device according to the first aspect of the present invention, the constant preload spring is fitted into the spring holder which is press-fitted into the axial hole of the seal cover. The plunger is always urged in the axial direction, and the plunger is prevented from projecting in the axial direction beyond a predetermined dimension by the stopper portion of the spring holder. In other words, since the constant preload spring is always stretched in the axial direction in the spring holder, it does not fall in the spring holder, that is, in the axial hole, and the outer ring due to insufficient spring preload due to spring fall. Creep can be prevented, and damage to the bearing device can be prevented.

Further, the constant preload spring itself does not contact the outer ring, and the plunger biased by the constant preload spring contacts the end surface of the outer ring, so that the surface pressure applied to the end surface is equal to the constant preload. A constant surface pressure against the end surface of the outer ring can be secured without being affected by the processing accuracy of the tip of the spring itself.

Further, a constant preload spring and a plunger are incorporated in a spring holder which is press-fitted into an axial hole of the seal cover, and the plunger is moved over a predetermined dimension by a stopper of the spring holder. Since the protrusion in the direction is restrained, there is no possibility that the constant preload spring, the plunger and the like fall out of the axial direction hole of the seal cover, and the workability at the time of assembling and the like can be improved.

In the bearing device according to the present invention, a constant preload spring and a plunger are fitted into an axial hole of the seal cover, and the constant preload spring always urges the plunger in the axial direction. The plunger is prevented from projecting in the axial direction exceeding a predetermined dimension by a stopper fixed to the axial hole of the seal cover. That is, since the constant preload spring always projects in the axial direction in the axial hole, the constant preload spring does not fall in the axial hole, resulting from a shortage of spring preload due to spring fall. Creep of the outer ring can be prevented, and damage to the bearing device can be prevented.

Further, the constant preload spring itself does not contact the outer ring, and the plunger biased by the constant preload spring contacts the end surface of the outer ring, so that the surface pressure applied to the end surface is constant. A constant surface pressure against the end surface of the outer ring can be secured without being affected by the processing accuracy of the tip of the spring itself.

Further, the plunger urged by the constant preload spring engages with a stopper fixed to the axial hole when the plunger projects in the axial direction by a predetermined dimension from the seal cover. Since the protrusion in the axial direction exceeding the dimension is restrained, there is no possibility that the constant preload spring or the plunger falls out of the axial hole, and the workability at the time of assembling and the like is improved.

Further, since a spring holder is not required, the constant preload spring can be mounted in the axial hole of the seal cover even when there is not enough space for the seal cover.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a fixed preload spring assembly structure of a bearing device according to a first embodiment of the present invention;

FIG. 2 is a sectional view showing a main part of a fixed preload spring assembly structure of the bearing device according to a second embodiment of the present invention;

FIG. 3 is a sectional view showing a main part of a fixed preload spring assembly structure of a bearing device according to a third embodiment of the present invention;

FIG. 4 is a sectional view of a conventional bearing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Inner ring, 2 ... Tapered roller, 3 ... Outer ring, 4 ... Seal cover, 4a ... Axial hole, 10 ... Spring holder, 10a ... Stopper part, 11 ... Constant preload spring, 12, 14 ... Plunger, 15 ... Stopper bolt.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16C 25/08

Claims (2)

(57) [Scope of request for utility model registration] An inner ring, a double row tapered roller, an outer ring, a seal cover provided with an axial hole facing the end face of the outer ring and opening toward the end face; and a shaft provided on the seal cover. A spring holder having a stopper portion which is press-fitted into the direction hole, a constant preload spring which is fitted into the spring holder, and which is fitted into the spring holder and is urged by the constant preload spring to contact the end surface of the outer race. When it protrudes in the axial direction from the spring holder so as to be in contact with it, and when it protrudes in the axial direction by a predetermined dimension, it engages with the stopper portion of the spring holder, and the axial projection exceeding the predetermined dimension is restrained. A constant-preload double-row tapered roller bearing device comprising a plunger. 2. A seal cover provided with an inner ring, a double row tapered roller, an outer ring, an axial hole facing the end face of the outer ring and opening toward the end face, and a shaft provided on the seal cover. A constant preload spring fitted into the direction hole; a plunger fitted into the axial direction hole, urged by the constant preload spring, protruding in the axial direction from the seal cover, and abutting against an end surface of the outer ring; The plunger is fixed to the axial hole, and engages with the plunger when the plunger projects in the axial direction by a predetermined dimension.
A constant-preload double-row tapered roller bearing device, comprising: a stopper for preventing the plunger from projecting in an axial direction exceeding a predetermined dimension.