WO2016114195A1

WO2016114195A1 - Bearing preload mechanism and shaft support device

Info

Publication number: WO2016114195A1
Application number: PCT/JP2016/050232
Authority: WO
Inventors: 伸寛田中
Original assignee: Ntn株式会社
Priority date: 2015-01-13
Filing date: 2016-01-06
Publication date: 2016-07-21
Also published as: JP6385286B2; JP2016130532A

Abstract

Provided is a bearing preload mechanism which can be easily handled when being installed in a bearing box and which enables a spring member to be replaced with good work efficiency. A spring member (14) is gripped by two split cases (11, 12) in a state in which the spring member (14) is axially compressible. A threaded section (15) is integrally formed in one split case (11), a support shaft section (16) is passed through the other split case (12) so as to be axially slidable, and the support shaft section (16) and the threaded section (15) are engaged with each other through threads. The support shaft section (16) is provided with an engagement portion (18) which axially engages with the other split case (12). A unit is assembled by axially limiting the separation of both split cases (11, 12) by means of the threaded section (15), the support shaft section (16), and the engagement portion (18) and connecting both split cases (11, 12) so that the spring member (14) can be maintained gripped therebetween.

Description

Bearing preload mechanism and shaft support device

The present invention relates to a bearing preload mechanism that is installed in a bearing box and in which a spring member generates a preload, and a shaft support device using the same.

Conventionally, in rolling bearings such as tapered roller bearings and angular contact ball bearings, smearing is prevented by preloading. For example, a double-row tapered roller bearing that receives the thrust load of a rolling mill roll for steel is installed in a bearing box and prevents accidental damage caused by foreign object biting by a seal, while rolling with appropriate preload. Used in a state where smearing is prevented by suppressing sliding of moving objects.

A general bearing preload mechanism is such that when the bearing ring is fitted to the bearing housing body and the lid is fastened to the bearing housing body, the lid pushes the bearing ring in the axial direction to apply axial preload. It has become. In this bearing preload mechanism, it is difficult to adjust the tightening amount of the lid, and there is a concern that excessive preload or preload loss may occur.

Therefore, in order to make it possible to easily achieve an appropriate preload without adjusting the amount of tightening of the lid, a spring member is inserted between the bearing ring and the spacer or the bearing box, and the spring member compressed between them is A bearing preload mechanism that generates preload (that is, axial force necessary for preload) has been proposed (Patent Document 1 below).

Patent Document 1 discloses a spacer in which a hole into which a spring member is inserted is formed. There is no retaining means for retaining the spring member in the hole, and the spring member is sandwiched between the spacer and the bearing ring or bearing box by axially butting the spacer and the bearing ring or bearing box. Thus, a predetermined compression state in which an appropriate preload can be applied is obtained. The bearing preload mechanism using this spacer can maintain the spring member in a predetermined posture on the inner surface of the hole and protect it from contamination.

Patent Document 1 also discloses a race ring in which a hole into which a spring member and a piston that receives this elastic repulsive force are inserted is formed, and a retaining ring can be fitted in a groove formed in the inner periphery of the hole. The spring member is brought into a predetermined compression state by abutting the piston against the bearing housing or the spacer in the axial direction. The bearing preload mechanism using this bearing ring can prevent the spring member and the like from coming off by the retaining ring, and therefore, the spring member or the like does not fall off when installed in the bearing box, and is excellent in handling.

Japanese Patent Laid-Open No. 10-184777

However, in the bearing preload mechanism using the bearing ring of Patent Document 1, when the retaining ring is removed from the ring groove on the inner periphery of the hole, the retaining ring, the piston, and the like pop out due to the elastic repulsion of the spring member. Exchange is not considered. For this reason, it is difficult to replace or clean the spring member whose function is deteriorated during use, and there is a possibility that the proper preload cannot be obtained because the spring member whose function is deteriorated continues to be used.

Therefore, a problem to be solved by the present invention is to provide a bearing preload mechanism that achieves both handling when installing in a bearing box and exchanging workability of a spring member.

In order to achieve the above object, the present invention provides a first split case that is installed in a bearing housing and sandwiches the spring member in an axially compressible state in a bearing preload mechanism in which the spring member generates preload. And the second split case, and the first split case and the second split case are passed through at least one split case so as to be slidable in the axial direction between the split cases. A structure is provided that includes a support shaft portion that extends and a screw portion that is screwed to the support shaft portion and restricts separation of the two split cases in the axial direction.
According to the above configuration, the first divided case and the second divided case sandwich the spring member in a compressible state, and the support shaft portion and the screw portion are screwed together so that the spring member can be held. Split cases can be connected and assembled into a unit. When the bearing preload mechanism in the unit state is installed in the bearing housing, the spring member does not fall off, and the handleability is excellent.
In addition, the bearing preload mechanism in the unit state is such that the support shaft part penetrates at least one of the divided cases so as to be slidable in the axial direction. Thus, the spring member can be compressed in the axial direction to generate an appropriate preload.
In addition, when replacing a spring member that has deteriorated its function, the two split cases can be separated by performing a screwing operation to release the above-described screwing in a state where the spring member has elastically recovered to the state before compression. Excellent workability for replacing parts.

For example, as a preferred embodiment, the support shaft portion or the screw portion is integrally provided in one of the split cases, and the screw portion or the support shaft portion opposite to the integrated target. However, it is mentioned that the other split case opposite to the one split case is provided so as to be locked in the axial direction.
In this case, the two split cases can be separated by screwing between the support shaft part or screw part integral with one split case and the screw part or support shaft part that can be axially locked to the other split case. Can be limited. Since one of the support shaft portion or the screw portion is integrated with the split case, the number of parts of the bearing preload mechanism can be reduced, and the labor for unitization can be reduced.

More preferably, the other divided case is disposed on the inner side of the bearing housing in the axial direction with respect to the one divided case, and the screwing release of the support shaft portion and the screw portion is performed on the other divided case. It can be implemented only from the case side.
As described above, when one split case and the support shaft portion or the screw portion are integrated, it is possible to employ the support shaft portion and the screw portion that can be unscrewed only from the other split case side. Further, when the other divided case disposed on the inner side of the bearing box is employed with respect to the one divided case, the screwing operation cannot be performed from the other divided case side while being installed in the bearing box. For this reason, it is possible to force the operator to release the screw after taking out from the bearing box in the unit state, and to prevent the spring member whose function is deteriorated from falling off.

Moreover, as a preferable aspect, it is mentioned that the said spring member consists of a coil spring and the said support shaft part is let to pass inside the said spring member.
If it does in this way, since the arrangement space of a spring member and a support shaft part is made common, space saving becomes possible.

Moreover, as a preferable aspect, it is possible to further include a seal attachment portion that is provided in the first divided case or the second divided case and is fitted to a seal.
If it does in this way, a seal | sticker can be attached using a division | segmentation case and it becomes possible to respond | correspond to the use environment by which a sealing function is requested | required.

It is preferable to employ an oil seal as the seal. An oil seal that is a contact type seal can obtain better sealing performance than a non-contact type labyrinth seal, and is suitable for a harsh environment such as a shaft support for a rolling mill roll for steel. Here, the tangential force when the lip of the oil seal makes sliding contact with the mating member on the rotating side can cause the split case having the seal mounting portion to rotate. If the rotation of the split case is limited by the connection of the split case and the stationary member, damage to the support shaft portion can be prevented.

For example, a knock pin that is driven into a split case having the seal mounting portion is further provided, the seal is made of an oil seal, and the knock pin can be circumferentially locked to another member that is stationary in the bearing box. Can be mentioned.
If it does in this way, rotation of the said division | segmentation case by the tangential force from an oil seal can be restrict | limited by the latching between the knock pin driven into the division | segmentation case and another member.

As another example, a split case provided integrally with the split case having the seal mounting portion, further including a protruding portion protruding in the axial direction, the seal is an oil seal, and the protruding portion is stationary in the bearing box. For example, the member can be locked in the circumferential direction.
If it does in this way, rotation of the said division | segmentation case by the tangential force from an oil seal can be restrict | limited by the latching between the protrusion part provided in the division | segmentation case and another member, without using a knock pin.

As another example, the seal may be an oil seal, and the support shaft portion may be locked in the circumferential direction to another member that is stationary in the bearing housing.
If it does in this way, rotation of the said division | segmentation case by the tangential force from an oil seal can be restrict | limited by the latching between a support shaft part and another member, without using a knock pin.

By providing a shaft support device comprising a rolling bearing having two single row races and one double row race and a bearing preload mechanism according to the present invention that applies preload to the single row races, An appropriate preload can be applied to the rolling bearing.

As described above, the bearing preload mechanism according to the present invention can be installed in the bearing box in the state of the unit with the spring member sandwiched between the two split cases by adopting the above configuration, and the support shaft portion and the screw portion of the unit. Since both the split cases are made separable by a screwing operation for releasing the screwing between them, it is possible to achieve both the handleability when installing in the bearing box and the workability of replacing the spring member.

Sectional drawing which shows the shaft supporting apparatus which concerns on 1st Embodiment of this invention. FIG. 1 is a partial cross-sectional view showing a bearing preload mechanism in a state where a cover of the bearing box in FIG. 1 is removed. Sectional drawing which shows the shaft support apparatus which concerns on 2nd Embodiment of this invention. Sectional drawing which shows the shaft support apparatus which concerns on 3rd Embodiment of this invention. Sectional drawing which shows the shaft support apparatus which concerns on 4th Embodiment of this invention. Side view of single-row track ring according to fourth embodiment of this invention

Hereinafter, a shaft support device according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2 of the accompanying drawings. The first embodiment shown in FIG. 1 includes a rolling bearing 1 and a pair of bearing preload mechanisms 2, and is installed in a bearing box 3. In the first embodiment, the shaft 4 is supported in the radial direction and the thrust direction, and mainly for thrust load reception. Hereinafter, the direction along the bearing central axis of the rolling bearing 1 is simply referred to as “axial direction”, and the direction perpendicular to the central axis is simply referred to as “radial direction”, and the circumferential direction around the central axis. This is simply called “circumferential direction”.

The rolling bearing 1 is a double-row rolling bearing having two single-row race rings 5, 5, one double-row race ring 6, and two rows of rolling

elements

7, 7. The single row raceway ring 5 is an annular body having a single row raceway surface. The double row raceway ring 6 is an annular body having a double row raceway surface.

The bearing box 3 includes a housing 8 that includes the rolling bearing 1 and the pair of bearing preload mechanisms 2, a lid 9 that can be attached to and detached from the housing 8, and a male screw part 10 that is used to fasten the lid 9 and the housing 8. The housing 8 holds the rolling bearing 1 and all the

bearing preload mechanisms

2 and 2 in the radial direction. When the lid 9 is fastened to the housing 8, the bearing housing 3 is in a state of holding the rolling bearing 1 and the pair of bearing preload mechanisms in the axial direction.

The shaft 4 is a rotating shaft that mainly applies a thrust load to the rolling bearing 1. As such an axis | shaft 4, the rotating shaft of the rolling mill roll for steel is mentioned.

The single row raceway ring 5 is an outer race having a raceway surface on the inner periphery. The single row race 5 is fitted to the inner periphery of the housing 8. The single row race 5 does not produce substantial axial displacement, radial displacement and circumferential rotation during operation of the rolling bearing 1. The double row raceway ring 6 is an inner race having two raceway surfaces on the outer periphery. The double row race 6 is fitted on the outer periphery of the shaft 4. The double row race 6 rotates integrally with the shaft 4. The rolling element 7 is a tapered roller interposed between the single row raceway ring 5 and the double row raceway ring 6.

The bearing preload mechanism 2 is a unit that applies a preload to the single row raceway ring 5. A bearing preload mechanism 2 disposed on the left side in the drawing with respect to the rolling bearing 1 generates a preload in the axial direction, and the preload is applied to the single row race 5 on the left side in the drawing from the left side to the right side in the drawing. Give. Similarly, the bearing preload mechanism 2 disposed on the right side in the figure applies preload to the single row race 5 on the right side in the figure in the axial direction from the right side to the left side in the figure. The number of bearing preload mechanisms installed in the bearing box is not limited to two, but may be one or any plural number.

The bearing preload mechanism 2 includes a first divided case 11 and a second divided case 12 that are divided in the axial direction. The 1st division | segmentation case 11 is the annular body provided integrally. The second split case 12 is an annular body that can be abutted against the first split case 11 in the axial direction. The first divided case 11 and the second divided case 12 are fitted to the inner periphery of the housing 8. The first divided case 11 and the inner surface of the bearing housing 3 are abutted in the axial direction. The 2nd division | segmentation case 12 and the side surface of the single row track ring 5 are faced | butted by the axial direction. The divided

cases

11 and 12 do not need to be directly abutted against the inner surfaces of the rolling bearing 1 and the bearing housing 3. As long as a path for transmitting the preload generated by the bearing preload mechanism 2 to the rolling bearing 1 can be constructed, a rigid body such as a spacer is provided between the divided

cases

11 and 12 and the single row raceway ring 5 and the bearing housing 3. It is also possible to intervene.

The first split case 11 has a hole 13 that faces the second split case 12 in the axial direction. A spring member 14 is inserted into the hole 13 from the axial direction. The hole 13 holds the inserted spring member 14 in the axial direction.

The spring member 14 is a coil spring. The spring member 14 that is not subjected to a compressive load (natural length) is set to a length that protrudes in the axial direction from the hole 13 toward the second split case 12.

The second split case 12 receives the spring member 14 inserted into the hole 13 of the first split case 11 in the axial direction. Both the

split cases

11 and 12 are separated in the axial direction when the spring member 14 having a natural length is sandwiched in the axial direction. Both the

split cases

11 and 12 can compress the spring member 14 inserted into the hole 13 until they face each other in the axial direction at the opposing surfaces. The spring member 14 does not need to protrude from the hole 13, is set to a natural length that can be completely accommodated in the hole 13, and is provided with a convex portion for spring compression that enters the hole 13 in the second divided case. Is also possible. Moreover, the hole part 13 can also be provided in the 2nd division | segmentation case side.

The bearing preload mechanism 2 includes connection means for connecting the two split

cases

11 and 12. This connecting means is passed through a threaded portion 15 provided integrally with the first divided case 11 and a penetrating state that is slidable in the axial direction with respect to the second divided case 12, and between the divided

cases

11, 12. And a support shaft portion 16 extending over the entire area.

The support shaft portion 16 is a male screw component that is passed through the through-hole portion 17 penetrating the second divided case 12 in the axial direction and screwed with the screw portion 15. The screw portion 15 is a female screw portion capable of screwing the support shaft portion 16 only from the second divided case 12 side.

The inner circumference of the through-hole portion 17 is formed in a stepped hole shape concentric with the screw portion 15. The inner diameter of the through-hole portion 17 is large on the rolling bearing 1 side and small on the first split case 11 side. The support shaft portion 16 is provided with a locking portion 18 having a diameter larger than the screw diameter. The locking portion 18 is provided integrally with the support shaft portion 16 as an end surface of a bolt head that can be locked in the axial direction to the stepped surface 19 of the through-hole portion 17.

The support shaft portion 16 is inserted into the through-hole portion 17 from the second divided case 12 toward the first divided case 11 and then screwed into the screw portion 15. The support shaft portion 16 does not penetrate through the first split case 11 while being screwed with the screw portion 15, and does not have a portion where torque can be applied to the support shaft portion 16 from the first split case 11 side. The support shaft portion 16 is a screwing operation for screwing or unscrewing the screw portion 15 only from the second split case 12 side where a screwdriver can be connected to the bolt head integral with the locking portion 18. Can be implemented. In addition, in order to save space by setting a narrow gap in the screw radial direction between the through-hole portion 17 and the support shaft portion 16, the screwing operation is performed with a hexagon wrench.

As shown in FIG. 2, the screw portion 15 screwed to the support shaft portion 16 fixes the support shaft portion 16 to the first divided case 11. For this reason, the threaded portion 15 can limit the separation of the two split

cases

11 and 12 that are separated to one axial side (the right side in the figure). At the same time, the locking portion 18 integral with the support shaft portion 16 screwed with the screw portion 15 can be locked to the stepped surface 19 of the second divided case 12. For this reason, the latching | locking part 18 provided in the support shaft part 16 can restrict | limit separation of both division |

segmentation cases

11 and 12 which leave | separate to the axial direction other side (left side in a figure) opposite to the thread part 15. FIG. In this way, the connecting means limits the separation of the two split

cases

11 and 12 so as to keep the spring member 14 sandwiched, and the axial displacement of the second split case 12 with respect to the support shaft 16 is within the above-described limit range. The

split cases

11 and 12 are connected to each other in a state permitted in the inside. Thereby, both the

split cases

11 and 12 and the spring member 14 become the bearing preload mechanism 2 assembled in the unit. The support shaft portion 16 has a cylindrical portion between the locking portion 18 and the screw portion 15, and the second division when the unit portion is in a sliding state between the cylindrical portion and the through-hole portion 17. The case 12 is guided in the axial direction.

In the state of the unit, when the locking portion 18 is locked to the stepped surface 19 of the second split case 12, the spring member 14 held between the

split cases

11 and 12 becomes a natural length. Such setting of the locking position is to allow complete elastic recovery of the spring member 14 in the unit state. It is possible to adopt a setting in which the locking portion 18 is locked when the spring member 14 is compressed. However, when the support shaft portion 16 and the screw portion 15 are screwed or unscrewed, the first setting is performed. Since the split case 11 and the second split case 12 are not likely to be jumped off due to the elastic repulsion of the spring member 14, the natural length is preferably generated.

The number, shape, circumferential arrangement, and the like of the threaded portion and the support shaft portion may be appropriately set as long as the two split cases are connected as described above. For example, a plurality of screw portions and support shaft portions are provided at equal intervals in the circumferential direction. Moreover, it is also possible to comprise a latching | locking part with a nut and to provide in a support shaft part by screwing together with a support shaft part. Moreover, it is also possible to comprise a screw part with a nut and to screw together with the protrusion part of the support shaft part which slidably penetrates the 1st division | segmentation case. It is also possible to provide a support shaft portion integrally with the first split case or the second split case, and the screw portion may be a nut or a bolt that can be screwed to the male screw or the female screw of the support shaft portion.

The second split case 12 has a seal attachment portion 21 that fits into the seal 20. The seal attachment portion 21 supports the seal 20 in the radial direction.

The seal 20 consists of an oil seal. An oil seal has a deformable part and usually a metallic retainer connected to it, which prevents fluid or grease leakage based on the radial inward or outward clamping force provided by the lip tip. It is to prevent.

The seal 20 is attached to the seal attachment portion 21 so as not to rotate in the circumferential direction. For this reason, the tangential force when the lip of the seal 20 is in sliding contact with the double row raceway ring 6 acts on the split case 12 from the seal mounting portion 21.

Note that the seal mounting portion can be provided in the first divided case. For example, it may be provided in a split case that is closer to the lip contact destination in both split cases.

The bearing preload mechanism 2 includes a detent means for connecting the other member stationary in the bearing housing 3 and the second split case 12 having the seal mounting portion 21 and receiving the tangential force described above by the other member.

The detent means includes a pin hole portion 22 that communicates in the axial direction between the second divided case 12 and the single row raceway ring 5, and a knock pin 23 that engages with the pin hole portion 22 in the circumferential direction. Have The knock pin 23 is a tapered pin that is driven into a portion of the pin hole portion 22 on the second divided case 12 side. The driven knock pin 23 protrudes in the axial direction from the second split case 12, and the second split case 12 is pivoted to the single row raceway ring 5 during the installation work for fitting the above unit into the housing 8. Along with being abutted in the direction, the pin hole 22 is inserted into a portion on the single-row raceway 5 side. The inserted knock pin 23 can be locked to the single-row track ring 5 in the circumferential direction. Here, the single row raceway ring 5 does not cause substantial axial displacement, radial displacement, and circumferential rotation with respect to the bearing housing 3, and therefore corresponds to the above-mentioned other members.

When the tangential force from the above-described seal 20 is transmitted to the second divided case 12, the knock pin 23 is quickly locked in the circumferential direction with respect to the single row raceway ring 5 (other member). Thereby, since the single row raceway ring 5 receives the aforementioned tangential force promptly, the second split case 12 does not substantially rotate due to the aforementioned tangential force (even if there is a knock pin 23 and a pin hole). The fitting gap of the portion 22). That is, it is not substantially generated that the support shaft portion 16 is twisted in the circumferential direction between the two split

cases

11 and 12 by the tangential force of the seal 20, and the support shaft portion 16 is not damaged.

In addition, the number, shape, circumferential arrangement, etc. of the pin holes and dowel pins are set appropriately as long as it is possible to prevent the load of the tangential force against the support shaft by preventing the split case having the seal mounting portion as described above. do it. For example, a plurality of knock pins and pin hole portions are provided at equal intervals in the circumferential direction. The knock pin can also be driven into a single row raceway. Further, since the lid of the bearing box becomes a member that is stationary in the bearing box when fastened to the housing, it can be used as another member. For example, when the seal attachment portion is provided in the first divided case, a knock pin may be locked to the lid.

Between the second divided case 12 having the seal attachment portion 21 and the inner periphery of the housing 8, an O-ring 24 for preventing passage of foreign matter or liquid is provided.

The first embodiment is as described above. The spring member 14 is sandwiched between the first split case 11 and the second split case 12 in a compressible state, and the support shaft portion 16 and the screw portion 15 are sandwiched. It is possible to assemble the bearing preload mechanism 2 into a unit by screwing together and connecting the

split cases

11 and 12 so that the spring member 14 can be held. For this reason, the bearing preload mechanism 2 can be installed in the housing 8 of the bearing housing 3 as shown in FIG. 2 in the unit state, and at this time, the spring member 14 does not fall off. Therefore, 1st Embodiment is excellent in the handleability at the time of installing the bearing preload mechanism 2 in the bearing housing 3. FIG.

Further, as shown in FIG. 1, the lid 9 of the bearing box 3 is fastened to the housing 8, whereby the first divided case 11 on the right side in the figure is axially moved from the state of FIG. 2 to the state of FIG. Into the bearing box 3. As a result, the bearing housing 3 is formed between the first divided case 11 of the bearing preload mechanism 2 on the left side in the drawing and the shoulder of the housing 8, and the second divided case 12 of the bearing preload mechanism 2 on the same side and the left side in the drawing. Between the first row raceway ring 5, between the first divided case 11 of the bearing preload mechanism 2 on the right side of the drawing and the lid 9 of the bearing housing 3, and between the first divided case 13 of the bearing preload mechanism 2 on the same side. And the single row raceway ring 5 on the right side in the figure are held in a state in which contact is forced in the axial direction.

Here, the first divided case 11 pushed into the lid 9 is displaced in the axial direction toward the inner side of the bearing housing 3 together with the support shaft portion 16 fixed by the screw portion 15. When the axial push of the lid 9 proceeds and the single row raceway ring 5 no longer undergoes axial displacement, the second split case 12 that abuts against the single row raceway ring 5 also has an axially inner side of the bearing housing 3. Can no longer be displaced. As the cover 9 is further pushed in the axial direction, the first divided case 11 pushed into the cover 9 penetrates the second divided case 12 (one divided case) so as to be slidable in the axial direction. Together with the shaft portion 16, the second divided case 12 approaches from the position of FIG. 2. With this approach, the spring member 14 sandwiched between the two split

cases

11 and 12 is compressed in the axial direction from the state of FIG. Finally, as shown in FIG. 1, the two split

cases

11 and 12 are abutted in the axial direction and the spring member 14 is compressed in the axial direction. As described above, the first embodiment compresses the spring member 14 in the axial direction by narrowing the distance between the two divided

cases

11 and 12 to generate an appropriate preload, thereby generating a single row track from the second divided case 12. It can be applied to the ring 5.

Further, when the function-deteriorated spring member 14 is replaced, if the lid 9 is removed from the housing 8, the spring member 14 is elastically restored to the state shown in FIG. 2, but the locking portion 18 and the second division of the support shaft portion 16 are restored. The bearing preload mechanism 2 is maintained in a unit state by the engagement between the cases 12 and the screwing of the support shaft portion 16 and the screw portion 15. For this reason, the bearing preload mechanism 2 can be taken out from the housing 8 in a unit state. After removing from the housing 8, if the screwing operation for releasing the screwing of all the support shaft parts 16 and the screw parts 15 is performed, the

split cases

11 and 12 can be separated, and the spring member 14 is inserted into the hole. The part 13 can be inserted and removed. For this reason, 1st Embodiment is excellent also in the exchange workability | operativity of the spring member 14. FIG.

Moreover, 1st Embodiment can be latched to the step part 19 of the 1st division | segmentation case 11 (one division | segmentation case) and the screw part 15 integral with the 2nd division | segmentation case 12 (other division | segmentation case). Since the separation between the two split

cases

11 and 12 can be limited by screwing with the support shaft portion 16, the number of parts of the bearing preload mechanism 2 can be suppressed and the unit can be reduced as compared with the case where the screw portion is constituted by a nut. This can reduce the time and effort required for the conversion process. It is possible to obtain the same effect when the support shaft portion is provided integrally with the first divided case or the second divided case, or when the screw portion is provided integrally with the second divided case. is there.

Further, in the first embodiment, since the locking portion 18 is integrally provided on the bolt head of the support shaft portion 16, the number of parts of the bearing preload mechanism 2 can be reduced as compared with the case where the locking portion is configured by a nut. This can reduce the labor of unitization.

In the first embodiment, the threading direction of the screw portion 15 provided integrally with the first split case 11 (one split case) and the first support shaft portion 16 screwed with the screw portion 15 are the first. Due to the inability to connect the screwdriver from the split case 11 side, the support shaft portion 16 and the screw portion 15 can be unscrewed only from the second split case 12 (the other split case) side. Since the second split case 12 (the other split case) is arranged on the inner side of the bearing housing 3 in the axial direction with respect to the spring member 14, the second split case 12 ( The screwdriver cannot be operated from the other split case side. For this reason, the first embodiment can force the operator to release the screw after the bearing preload mechanism 2 is removed from the bearing housing 3 in a unit state, and can prevent the spring member 14 whose function has deteriorated from falling off. .

It is possible to provide the threaded portion integrally with the second divided case and the through hole portion to the first divided case, but in this case, when the lid is removed, both the divided cases remain fitted to the housing. It becomes possible to perform the screwing operation for releasing the screwing. Then, it becomes possible to take out only the first divided case from the housing and replace the spring member. In the case of taking out the first divided case alone, the spring member is not clamped, so that the spring member can be easily removed from the hole where it is merely inserted. On the other hand, in the first embodiment, the bearing preload mechanism 2 can be removed from the housing 8 as a unit, and the spring member 14 can be reliably prevented from dropping not only when the bearing preload mechanism 2 is installed but also when the bearing preload mechanism 2 is removed. Excellent.

Further, in the first embodiment, since the seal attaching portion 21 to be fitted to the seal 20 is provided in the second split case 12, the seal 20 can be attached using the split case 12, and a seal function is required. It can correspond to the usage environment. In particular, since the first embodiment employs an oil seal as the seal 20, it is suitable for a severer environment than when a labyrinth seal is employed.

Further, in the first embodiment, a single row race ring 5 (other member) that is driven into a second split case 12 having a seal attachment portion 21 and is stationary with respect to both split

cases

11 and 12 is locked in the circumferential direction. Since the possible knock pin 23 is provided, the rotation of the second split case 12 due to the tangential force from the seal 20 is limited by the engagement between the knock pin 23 and the single row raceway ring 5 (other member), and the support shaft portion 16 Damage can be prevented.

The second embodiment will be described with reference to FIG. Hereinafter, only differences from the first embodiment will be described. The second embodiment includes a pin hole portion 31 that penetrates the second split case 30 in the axial direction, and an O-ring 33 that is interposed between the knock pin 32 and the inner periphery of the pin hole portion 31. The O-ring 33 prevents foreign matter and liquid from passing through the pin hole 31.

The third embodiment will be described with reference to FIG. The second split case 40 of the fourth embodiment has an outer diameter extension portion 42 that is longer in the axial direction than the through-hole portion 41 and fits into the housing 8. The spring member 43 is also inserted into the through hole 41. The first split case 44 has a threaded portion 46 provided so as to pass through a position located inside the spring member 43 inserted into the hole 45. The coil winding diameter of the spring member 43 is larger than that of the first embodiment. The support shaft portion 47 is passed through the inside of the spring member 43 and screwed with the screw portion 46. A receiving portion 51 that is recessed in the axial direction from the end surface 50 that defines the width of the single row raceway ring 49 is provided at a location facing the stepped surface 48 of the through-hole portion 41 in the axial direction. The support shaft portion 47 has a locking portion 52 that is inserted into the receiving portion 51 in the axial direction, and is a portion that replaces the knock pin of the first embodiment. The outer diameter extension 42 is fitted to the outer periphery of the single row raceway ring 49 and prevents eccentricity between the second split case 40 and the single row raceway ring 49. This prevention of eccentricity is to avoid a load between the receiving portion 51 and the support shaft portion 47.

Since the third embodiment includes the support shaft portion 47 that is passed through the inside of the spring member 43 (that is, the space inside the coil inner diameter), the arrangement space of the spring member 43 and the support shaft portion 47 is made common, and these arrangements are made. Can be saved.

In addition, since the third embodiment includes the support shaft portion 47 that can be locked in the circumferential direction on the receiving portion 51 (other member) of the single-row raceway ring 49, the support shaft portion 47 and the single shaft shaft 47 can be used without using a knock pin. The rotation of the second divided case 40 can be limited by the engagement between the receiving portions 51 (other members) of the row ring 49, and the number of parts can be reduced as compared with the first embodiment.

4th Embodiment is described based on FIG. 5, FIG. The second split case 60 of the fourth embodiment includes a connection surface 63 that is axially butted against an end surface 62 that defines the width of the single row raceway ring 61, and an axial direction from the connection surface 63 to the single row raceway ring 61 side. And a protruding portion 64 protruding to the surface. The single row race 61 is provided with a receiving portion 65 that is recessed in the axial direction from an end face 62 that defines the width of the single row race 61. The protruding portion 64 is inserted into the receiving portion 65 in the axial direction and serves as a portion that replaces the knock pin of the first embodiment.

The fourth embodiment is provided integrally with the second split case 60 and includes a protrusion 64 that can be locked in the circumferential direction on the receiving portion 65 (other member) of the single row race ring 61, so that a knock pin is used. At least, the rotation of the second divided case 60 is limited by the engagement between the protrusion 64 of the second divided case 60 and the receiving portion 65 (other member) of the single row race ring 61, and the number of parts is reduced to the first. This can be reduced as compared with the embodiment.
The technical scope of the present invention is not limited to the above-described embodiments, and includes all modifications within the scope of the technical idea based on the description of the scope of claims.

DESCRIPTION OF SYMBOLS 1 Rolling bearing 2 Bearing preload mechanism 3

Bearing case

5, 49, 61 Single row raceway ring 6 Double row raceway ring 8 Housing 9

Cover

11, 44 1st division | segmentation case (one division | segmentation case)
12, 30, 40, 60 Second divided case (one divided case, the other divided case, a divided case having a seal mounting portion)
13, 45

Hole portion

14, 43

Spring member

15, 46

Screw portion

16, 47

Support shaft portion

17, 41 Through

port portion

18, 52

Locking portion

19, 48 Stepped surface 20 Seal 21

Seal mounting portion

22, 31

Pin hole Portions

23 and 32 Knock pins 24 and 33 O-ring 51 Receiving portion 64 Protruding portion 65 Receiving portion

Claims

In the bearing preload mechanism installed in the bearing housing and the spring member generates preload,
A first split case and a second split case sandwiching the spring member in an axially compressible state;
Of the first split case and the second split case, it is passed through a penetrating state that is slidable in the axial direction with respect to at least one split case, and a support shaft portion extending between the split cases,
A bearing preload mechanism comprising: a threaded portion that is screwed to the support shaft portion and restricts separation of the two split cases in the axial direction.
The support shaft portion or the threaded portion is provided integrally with one of the two split cases,
2. The bearing preload mechanism according to claim 1, wherein the screw portion or the support shaft portion opposite to the integrated object is provided so as to be axially engageable with the other divided case opposite to the one divided case. .
The other split case is disposed on the inner side of the bearing housing in the axial direction with respect to the spring member, and the unscrewing of the support shaft portion and the screw portion can be performed only from the other split case side. The bearing preload mechanism according to claim 2.
The spring member comprises a coil spring;
The bearing preload mechanism according to any one of claims 1 to 3, wherein the support shaft portion is passed inside the spring member.
The bearing preload mechanism according to any one of claims 1 to 4, further comprising a seal mounting portion that is provided in the first divided case or the second divided case and is fitted to a seal.
A knock pin that is driven into a split case having the seal mounting portion;
The seal comprises an oil seal,
The bearing preload mechanism according to claim 5, wherein the knock pin can be locked in a circumferential direction to another member stationary in the bearing housing.
Provided integrally with the split case having the seal mounting portion, further comprising a protruding portion protruding in the axial direction,
The seal comprises an oil seal,
The bearing preload mechanism according to claim 5, wherein the protruding portion can be locked in a circumferential direction to another member stationary in the bearing box.
The seal comprises an oil seal,
The bearing preload mechanism according to claim 5, wherein the support shaft portion can be locked in a circumferential direction to another member stationary in the bearing housing.
A rolling bearing having two single row races and one double row race;
A shaft support device comprising: the bearing preload mechanism according to any one of claims 1 to 8, which applies a preload to the single row raceway ring.