JP2011169356A - Rolling bearing device with lubricating function, and method for setting crush allowance of seal member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device with a lubricating function such as air oil lubrication, which adequately manages a crush allowance of a seal member. <P>SOLUTION: The rolling bearing device 1A with the lubricating function includes a rolling bearing 1 having an inner ring 2, an outer ring 3, and a rolling element 4. In an outer ring spacer 7 as a nozzle forming member, a lubricating oil flow path 11 is provided consisting of a nozzle hole 12 and an inflow hole 13. A flow path inlet 14 of the lubricating oil flow path 11 has a spot-facing seal mounting recessed portion 15 provided on the outer diameter face of the outer ring spacer 7, an annular seal member 16 formed of an elastic material, and provided in the seal mounting recessed portion 15 partially protruding from the outer diameter face of the outer ring spacer 7, and a seal protrusion amount adjusting ring 17 provided between the bottom face of the seal mounting recessed portion 17 and the annular seal member 16. A bearing radial size h of the seal protrusion amount adjusting ring 17 is selectively set to adjust a protrusion amount t of the annular seal member 16 from the outer diameter face of the outer ring spacer 7. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rolling bearing device with a lubrication function used for supporting a high-speed spindle such as a machine tool spindle, and a crushing margin setting method for a seal member incorporated in the rolling bearing device with a lubrication function.

  Machine tool spindles tend to increase in speed in order to increase machining efficiency. In response to such high speeds, air-oil lubrication in which air oil mixed with lubricating oil and air is injected into the bearing from the nozzle hole is often used for lubrication of rolling bearings for machine tool spindles (for example, Patent Documents). 1, 2).

  As shown in FIG. 14, the air-oil lubricated bearing described in Patent Document 1 is provided with a nozzle hole 41 in an outer ring spacer 40, and a fitting hole 43 that penetrates a housing 42 from an outer diameter surface to an inner diameter surface. Are provided on the outer diameter surface of the outer ring spacer 40 so as to substantially align with the fitting hole 43, and the air oil in the housing 42 is provided in the fitting hole 43 and the fitting recess 44. A flow path connecting member (nozzle piece) 48 having a flow path 47 that connects the flow path (oil supply path) 45 and the air oil flow path (oil discharge hole) 46 in the outer ring spacer 40 is fitted. An annular seal member 49 made of an O-ring is provided in the clearance between the flow path connection member 48 and the inner wall of the fitting hole 43 and the clearance between the tip of the flow path connection member 48 and the bottom surface of the fitting recess 44. Air oil is prevented from leaking from the clearance.

  As shown in FIG. 15, the air-oil lubricated bearing described in Patent Document 2 is provided with a nozzle hole 52 in the outer ring 51, and a processing hole 54 penetrating from the outer diameter surface to the inner diameter surface is formed in the housing 53. In addition, the outer ring 51 is provided with a countersunk-shaped lubricant receiving portion 55 formed of a concave portion substantially aligned with the processing hole 54, and the nozzle hole 52 is provided in the processing hole 54 and the lubricant receiving portion 55. A flow path forming member (pin) 57 having an air oil flow path (lubricating oil supply path) 56 connected to the inside is fitted. An annular seal member 58 made of an O-ring is provided in the gap between the tip of the flow path forming member 57 and the bottom of the lubricant receiving portion 55 to prevent air oil from leaking from the gap.

  When the flow path connecting member and the flow path forming member as described above are not used, as shown in FIG. 16, the lubricating oil supply path 18 and the outer ring in the housing 9 on the outer diameter surface of the nozzle forming member consisting of the outer ring spacer 7 A structure in which a countersink-shaped seal mounting recess 15 is provided at a connection point with the inflow hole 13 in the spacer 7 and an annular seal member 16 made of an O-ring is fitted in the seal mounting recess 15 is employed. In the illustrated example, the nozzle hole 12 is provided in the outer ring spacer 7. However, the outer ring 3 may be provided as the nozzle forming part by providing the outer ring 3 with the nozzle hole 12.

JP 11-311254 A Japanese Utility Model Publication No. 5-72305

  When the outer ring spacer or the outer diameter surface of the outer ring is provided with a countersink-shaped recess (15, 44, 45) for fitting an O-ring, for each individual part due to deformation during processing by heat treatment or the like. Variation occurs in the depth dimension of the recess. In addition, the outer ring spacer outer diameter, outer ring outer diameter, housing inner diameter, O-ring diameter, and other dimensions also vary slightly due to processing errors for each individual part. For this reason, if the parts manufactured separately are simply assembled, the crushing margin of the O-ring, that is, the amount of compressive deformation is not constant. The above Patent Documents 1 and 2 do not mention this countermeasure. If the O-ring crushing cost is not properly managed, the following problems occur. That is, when the crushing allowance is too large, the O-ring may be damaged by an excessive load. In addition, when the crushing cost is insufficient, air oil can leak.

  In the case of the structure of FIG. 16, if the depth of the seal mounting recess 15 is known, the crushing allowance of the O-ring can be managed by selecting an O-ring having a thickness corresponding to the depth. However, it is difficult to accurately measure the depth of the seal mounting recess 15. This is because when the seal mounting recess 15 is viewed from the axial direction, the outer edge of the seal mounting recess 15 has an arc shape as shown in FIG. 17, and therefore the deepest value a of the seal mounting recess 15 is very difficult to measure. Therefore, the crushing cost of the O-ring cannot be properly managed, and there is a possibility that the O-ring is broken or air oil leaks.

  Further, the air-oil lubricated bearings of Patent Documents 1 and 2 have radial through holes (fitting holes 43 and processing holes 54) for fitting the flow path connecting member 48 and the flow path forming member 57 to the housings 42 and 53. Need to be opened, and the number of steps for manufacturing the housings 42 and 53 is increased. In addition, the flow path connecting member 48 and the flow path forming member 57 must be manufactured separately from the housings 42 and 53. For example, the flow path connecting member 48 has an annular groove (locking groove) 48a for attaching an O-ring on the outer diameter surface, and has a complicated structure having an air oil flow path 47 inside, so that it is often manufactured. It takes a lot of time. Further, a holding plate 50 for preventing the flow path connecting member 48 from coming off is also required.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to appropriately manage a crushing cost of a seal member in a rolling bearing device having a lubrication function such as air oil lubrication in order to prevent damage to a seal member such as an O-ring and leakage of lubricating oil. That is.
Another object of the present invention is to provide a sealing member crushing allowance setting method capable of easily setting an appropriate crushing allowance of the seal member.

  A rolling bearing device with a lubrication function according to the present invention includes a rolling bearing having an inner ring, an outer ring, and a rolling element, and a tip is a bearing at a nozzle forming member formed of an outer ring spacer or the outer ring provided adjacent to the outer ring. There is provided a lubricating oil flow path comprising a nozzle hole that opens toward the space and discharges lubricating oil, and a flow path inlet that communicates with the nozzle hole and an inflow hole that opens to the outer diameter surface of the nozzle forming component. Is an annular seal comprising a countersink-shaped seal mounting recess provided at the periphery of the opening of the inflow hole and an elastic body partially protruding from the outer diameter surface of the nozzle forming member and provided in the seal mounting recess The nozzle of the annular seal member is provided in the seal mounting recess between the bottom surface of the seal mounting recess and the annular seal member, and according to an arbitrarily set bearing radial dimension. And having a sealing protrusion amount adjustment ring for adjusting the amount of projection of the outer diameter surface of the formed member.

  According to this configuration, the nozzle forming member is provided with the lubricating oil flow path including the nozzle hole and the inflow hole, and during operation, the lubricating oil supplied from the outside opens to the outer diameter surface of the nozzle forming member. It enters the inflow hole from the inlet of the flow path, and is discharged from the nozzle hole to the bearing space. Thereby, each rolling surface of the inner and outer rings is lubricated.

  The flow path inlet includes a seal mounting recess, an annular seal member, and a seal protrusion adjustment ring, and the annular seal member allows the inner diameter surface of the housing in which the rolling bearing device with a lubrication function is incorporated and the seal protrusion adjustment ring. Seal the gap between them. By arbitrarily setting the bearing radial direction dimension of the seal protrusion amount adjusting ring, the protrusion amount of the annular seal member from the outer diameter surface of the nozzle forming member is adjusted. This method of adjusting the protrusion amount is much easier than the method of adjusting the protrusion amount by changing the depth of the seal mounting recess. This is because, as explained in the section of the problem to be solved by the invention, the deepest value of the seal mounting recess is very difficult to measure. As a method of setting the bearing radial direction dimension of the seal protrusion amount adjusting ring, for example, a plurality of types of seal protrusion amount adjusting rings having slightly different bearing radial direction dimensions are prepared, and an appropriate bearing radial direction is selected from them. There are a method of selecting a size, a method of adjusting a bearing radial direction size by shaving, and the like. By adjusting the protruding amount of the annular seal member to an appropriate value, it is possible to appropriately manage the crushing amount of the annular seal member, that is, the amount of compressive deformation in a state where the rolling bearing device with a lubricating function is incorporated in the housing. Thereby, damage to the annular seal member and leakage of the lubricating oil can be prevented.

  The nozzle forming member may be the outer ring spacer or the outer ring. In any case, the above-mentioned actions and effects can be obtained satisfactorily.

In the present invention, an annular elastic member may be interposed between the bottom surface of the seal mounting recess and the seal protrusion amount adjusting ring.
If an annular elastic member is interposed between the bottom surface of the seal mounting recess and the seal protrusion adjustment ring, the annular elastic member is compressed and deformed in a state where the rolling bearing device with a lubrication function is incorporated in the housing. The distance from the bottom surface of the recess to the contact surface with the annular seal member of the seal protrusion adjustment ring is adjusted. In other words, not only the method of arbitrarily setting the bearing radial direction dimension of the seal protrusion amount adjusting ring, but also the method of arbitrarily selecting an annular elastic member having an appropriate elastic deformation rate, the outer diameter of the nozzle forming member of the annular seal member The amount of protrusion from the surface can be adjusted.

In this invention, it is preferable that the outer end surface of the seal protrusion amount adjusting ring is substantially parallel to the outer diameter surface of the nozzle forming member.
The inner diameter surface of the housing in which the rolling bearing device with a lubrication function is incorporated is parallel to the outer diameter surface of the nozzle forming member. Therefore, if the outer end surface of the seal protrusion adjustment ring is substantially parallel to the outer diameter surface of the nozzle forming member, the outer end surface of the seal protrusion adjustment ring is also substantially parallel to the inner diameter surface of the housing. Thereby, each part of the annular seal member interposed between the outer end face of the seal protrusion amount adjusting ring and the inner diameter face of the housing can be uniformly compressed and deformed.

In this invention, you may provide the deformation | transformation prevention ring which prevents a deformation | transformation of this annular seal member in the inner periphery of the said annular seal member.
The deformation prevention ring operates as follows. For example, if a deformation prevention ring is not provided, when the rolling bearing device with a lubrication function is incorporated into the housing, the annular seal member is pulled along the inner diameter surface of the housing due to friction with the housing and partially deformed. There is a possibility that the annular seal member is assembled in the state. When such deformation of the annular seal member occurs, the deformed portion of the annular seal member closes the inflow hole, thereby obstructing the flow of the lubricating oil. If the deformation prevention ring is provided, the annular seal member can be prevented from being deformed.

The annular seal member and the deformation prevention ring may be configured to be in contact with the seal protrusion amount adjusting ring on the same plane.
If it is this structure, the outer end surface of a seal protrusion amount adjustment ring may be a flat surface, and a seal protrusion amount adjustment ring can be made into a simple shape.

A positioning recess may be provided on the outer end surface of the seal protrusion amount adjusting ring so as to be recessed from a position where the annular seal member contacts, and a part of the deformation prevention ring may be fitted into the positioning recess.
When the annular seal member and the deformation prevention ring are in contact with the seal protrusion adjustment ring on the same plane, the friction between the annular seal member and the housing causes the annular seal member to move with respect to the housing, and the deformation prevention ring is slightly associated therewith. There is a possibility of moving. If the deformation prevention ring moves, the position of the hollow part of the deformation prevention ring, which is a passage for the lubricating oil, is displaced, and the flow of the lubricating oil may be obstructed. If a part of the deformation prevention ring is fitted to the positioning recess provided on the outer end surface of the seal protrusion adjustment ring as described above, the movement of the deformation prevention ring can be restricted, and the lubricating oil is always good. Can be maintained.

The seal protrusion amount adjusting ring and the deformation prevention ring may be integrally formed.
If the seal protrusion amount adjusting ring and the deformation prevention ring are integrated, the number of parts can be reduced, and the displacement of the deformation prevention ring does not occur.

The deformation prevention ring may be made of metal or resin.
Both metal and resin are easy to process and are suitable as a material for the deformation prevention ring.

  In this invention, the lubricating oil supply method may be air oil lubrication in which the lubricating oil is supplied with compressed air, or may be oil mist lubrication in which the lubricating oil is supplied in the form of a mist with compressed air, Or jet lubrication which injects lubricating oil at high speed and supplies oil may be sufficient.

  The rolling bearing device of the present invention can be suitably used for supporting a machine tool spindle that rotates at a high speed because the above-described effects can be obtained.

  The seal member crushing allowance setting method of the present invention is a method applied to the rolling bearing device with a lubrication function, wherein the nozzle forming member has an outer diameter, an inner diameter of a housing in which the rolling bearing device with a lubrication function is incorporated, The crushing margin of the annular seal member is set by determining the bearing radial direction dimension of the seal protrusion amount adjusting ring according to the depth of the seal mounting recess and the specification of the annular seal member.

The outer diameter of the nozzle forming member is d, the inner diameter of the housing is D, the depth of the seal mounting recess is a, the thickness of the annular seal member is w, the optimum crushing allowance determined by the specifications of the annular seal member is δ, and the seal protrudes When the bearing radial dimension of the quantity adjusting ring is h, and the protruding amount from the outer diameter surface of the nozzle forming part of the annular seal member in a state where the rolling bearing device with lubrication function is not incorporated in the housing, t is 1 and Expression 2 are satisfied (see FIG. 1).
t = δ + (D−d) / 2 (Formula 1)
h + w = a + t (Formula 2)
From these equations 1 and 2,
h = a + t−w = a + δ + (D−d) / 2−w (Formula 3)
Is guided. By setting the bearing radial direction dimension h of the seal protrusion amount adjusting ring to a value calculated from Equation 3, the crushing allowance of the annular seal member can be set optimally.

In the sealing member crushing allowance setting method, a recess depth measuring member whose overall bearing radial dimension is known is inserted into the seal mounting recess so that the tip is in contact with the bottom surface, and the recess depth measuring member is inserted. The dimension in the bearing radial direction of the portion protruding from the seal mounting recess is measured, and the depth of the seal mounting recess is obtained from the measured value and the overall bearing radial direction dimension of the known recess depth measuring member. be able to.
When the bearing radial direction dimension of the recess depth measurement member is H, and the bearing radial direction dimension of the portion protruding from the seal mounting recess of the recess depth measurement member is b,
a = H−b
The relationship holds. Therefore, the depth a of the seal mounting recess can be determined by measuring the bearing radial direction dimension b of the portion protruding from the seal mounting recess of the recess depth measuring member. Measurement of b is easy.

  A rolling bearing device with a lubrication function according to the present invention includes a rolling bearing having an inner ring, an outer ring, and a rolling element, and a tip is a bearing at a nozzle forming member formed of an outer ring spacer or the outer ring provided adjacent to the outer ring. There is provided a lubricating oil flow path comprising a nozzle hole that opens toward the space and discharges lubricating oil, and a flow path inlet that communicates with the nozzle hole and an inflow hole that opens to the outer diameter surface of the nozzle forming component. Is an annular seal comprising a countersink-shaped seal mounting recess provided at the periphery of the opening of the inflow hole and an elastic body partially protruding from the outer diameter surface of the nozzle forming member and provided in the seal mounting recess The nozzle of the annular seal member is provided in the seal mounting recess between the bottom surface of the seal mounting recess and the annular seal member, and according to an arbitrarily set bearing radial dimension. Since it has a seal protrusion amount adjustment ring that adjusts the protrusion amount from the outer diameter surface of the component member, the crushing margin of the seal member is properly managed to prevent damage to the seal member such as the O-ring and leakage of lubricating oil be able to.

  The seal member crushing allowance setting method of the present invention is a method applied to the rolling bearing device with a lubrication function, wherein the nozzle forming member has an outer diameter, an inner diameter of a housing in which the rolling bearing device with a lubrication function is incorporated, In order to set the crushing margin of the annular seal member by setting the bearing radial direction dimension of the seal protrusion amount adjusting ring according to the depth of the seal mounting recess and the specification of the annular seal member, An appropriate crushing allowance can be easily set.

(A) is sectional drawing of the rolling bearing apparatus with a lubrication function concerning embodiment of this invention, (B) is the IB part enlarged view. It is II-II sectional drawing of FIG. 1 (B). It is explanatory drawing which shows the measuring method of the depth of the seal attachment recessed part of the rolling bearing apparatus with the said lubrication function. It is sectional drawing of the principal part of the rolling bearing apparatus with a lubrication function concerning different embodiment of this invention. It is sectional drawing of the rolling bearing apparatus with a lubrication function concerning further different embodiment of this invention. It is a perspective view of the deformation | transformation prevention ring of the rolling bearing device with the said lubrication function. It is sectional drawing of the rolling bearing apparatus with a lubrication function concerning further different embodiment of this invention. It is a perspective view of the deformation | transformation prevention ring of the rolling bearing device with the said lubrication function. It is sectional drawing of the rolling bearing apparatus with a lubrication function concerning further different embodiment of this invention. It is a perspective view of the seal protrusion amount adjustment ring / deformation prevention ring of the rolling bearing device with the lubricating function. It is sectional drawing which shows an example of the main axis | shaft apparatus using the rolling bearing apparatus with a lubrication function of FIG. (A) is sectional drawing of the rolling bearing apparatus with a lubrication function shown for convenience, and (B) is the XIIB arrow directional view. It is sectional drawing of the rolling bearing device with a lubrication function shown as a reference example. It is sectional drawing of an example of the conventional air oil lubricated bearing. It is sectional drawing of the example from which the conventional air oil lubrication bearing differs. It is sectional drawing of the further different example of the conventional air oil lubricated bearing. It is sectional drawing which looked at the seal attachment recessed part of the air oil lubricated bearing of FIG. 16 from the axial direction.

  An embodiment of the present invention will be described with reference to FIGS. In FIG. 1, the rolling bearing device 1 </ b> A with a lubrication function includes a rolling bearing 1 that is an angular ball bearing and an outer ring spacer 7 that is disposed adjacent to the rolling bearing 1. The rolling bearing 1 includes an inner ring 2, an outer ring 3, and a plurality of rolling elements 4 interposed between the rolling surfaces 2 a and 3 a of the inner and outer rings 2 and 3. The rolling elements 4 are formed of balls, and each rolling element 4 is held in a pocket 5 a of a cage 5. The outer ring spacer 7 is disposed in contact with the end face on the bearing rear side of the outer ring 3 which is a fixed-side raceway ring. The inner ring 2, the outer ring 3, and the rolling element 4 are made of metal, for example, bearing steel. The outer ring spacer 7 is also made of metal.

  An inner ring spacer 8 is disposed on the bearing back side of the inner ring 2 that is the rotation side raceway ring. This rolling bearing device 1A with a lubricating function is incorporated in a fixed state on the inner periphery of the housing 9, and is inserted into the inner periphery of the inner ring 2 so that a shaft (not shown) rotates integrally.

  The outer ring spacer 7 is a nozzle forming member, and has a lubricating oil flow path 11 for guiding air oil supplied from the outside to the bearing space. The lubricating oil flow path 11 is composed of a nozzle hole 12 whose tip is opened toward the bearing space, and an inflow hole 13 communicating with the nozzle hole 12. The flow path inlet 14 of the inflow hole 13 opens to the outer diameter surface of the outer ring spacer 7.

  As shown in an enlarged view in FIG. 1B, the flow path inlet 14 includes a countersink-shaped seal attachment recess 15 provided at the opening periphery of the inflow hole 13. In the seal mounting recess 15, an annular seal member 16 made of an elastic body and a seal protrusion amount adjusting ring 17 disposed between the annular seal member 16 and the bottom surface of the seal mounting recess 15 are provided. The annular seal member 16 is, for example, an O-ring. The hollow hole 17 a of the seal protrusion amount adjusting ring 17 has substantially the same diameter as the inflow hole 13. The seal protrusion amount adjusting ring 17 is made of metal or resin.

  When the seal protrusion amount adjusting ring 17 is viewed from the axial direction, as shown in FIG. 2, both sides of the outer end surface are inclined surfaces 17 b that are obliquely cut along the outer diameter surface of the outer ring spacer 7. . Thereby, the outer end face of the seal protrusion amount adjusting ring 17 is substantially parallel to the outer diameter face of the outer ring spacer 7. Since the inner diameter surface of the housing 9 is parallel to the outer diameter surface of the outer ring spacer 7, the outer end surface of the seal protrusion adjustment ring 17 is also substantially parallel to the inner diameter surface of the housing 9.

  In FIG. 1 (B) and FIG. 2, the annular seal member 16 when the rolling bearing device 1A with a lubrication function is incorporated into the housing 9 is shown by a solid line, and the annular seal member 16 when it is not incorporated is shown by a chain line. Yes. In any case, a part of the annular seal member 16 protrudes from the outer diameter surface of the outer ring spacer 7 which is a nozzle forming member. However, when the rolling bearing device 1A with a lubrication function is incorporated in the housing 9, the seal is sealed. The protrusion amount adjusting ring 17 and the housing 9 are crushed and elastically deformed. Since the outer end surface of the seal protrusion amount adjusting ring 17 is substantially parallel to the inner diameter surface of the housing 9, each part of the annular seal member 16 is uniformly deformed, and the outer end surface of the seal protrusion amount adjusting ring 17 and the inner diameter surface of the housing 9. On the other hand, each part is in contact with substantially the same surface pressure.

  As shown in FIG. 1, the housing 9 is provided with a lubricating oil supply passage 18 that connects an external air oil supply device (not shown) and the lubricating oil passage 11 of the outer ring spacer 7. The air oil supply device is a device that mixes and feeds lubricating oil and compressed air. Positioning means in the circumferential direction between the housing 9 and the outer ring spacer 7 so that the lubricating oil supply path 18 of the housing 9 and the lubricating oil flow path 11 of the outer ring spacer 7 are always relatively at the same circumferential position. (Not shown) is provided.

  As the seal protrusion amount adjusting ring 17, a plurality of types having a slightly different bearing radial dimension are prepared, and an outer ring of the annular seal member 16 is selected by selecting an appropriate bearing radial dimension. The protrusion amount t (FIG. 1B) from the outer diameter surface of the spacer 7 is adjusted. The size of the seal protrusion amount adjusting ring 17 in the bearing radial direction may be adjusted by cutting the seal protrusion amount adjusting ring 17 or the like. By setting the projecting amount t of the annular seal member 16 to an appropriate value, the crushing allowance δ (FIG. 1B) of the annular seal member 16 in a state where the rolling bearing device 1A with a lubricating function is incorporated in the housing 9, that is, the amount of compressive deformation. Can be managed properly. Thereby, damage to the annular seal member 16 and leakage of air oil can be prevented.

A method of setting the ring seal member crushing margin will be described in detail with reference to FIG.
The outer diameter of the outer ring spacer 7 which is a nozzle forming member is d, the inner diameter of the housing 9 is D, the depth of the seal mounting recess 15 is a, the thickness dimension of the annular seal member 16 is w, and the specifications of the annular seal member 16 The determined optimum crushing margin is δ, the dimension of the seal protrusion amount adjusting ring 17 in the bearing radial direction is h, and the outer ring spacer 7 of the annular seal member 16 is outside the rolling bearing device 1A with a lubrication function not incorporated in the housing 9. When the amount of protrusion from the radial surface is t, the following expressions 1 and 2 are satisfied.
t = δ + (D−d) / 2 (Formula 1)
h + w = a + t (Formula 2)
From these equations 1 and 2,
h = a + t−w = a + δ + (D−d) / 2−w (Formula 3)
Is guided. By setting the bearing radial direction dimension h of the seal protrusion amount adjusting ring 17 to a value calculated from Expression 3, the crushing allowance δ of the annular seal member 16 can be set optimally.

  The depth of the seal mounting recess 17 is likely to vary in size due to deformation during processing by heat treatment or the like. Therefore, it is necessary to actually measure the depth a of the seal mounting recess 17 for each product. However, for the reason described in the column of the problem to be solved by the invention, it is difficult to directly measure the depth a of the seal mounting recess 17 directly. Therefore, the depth a of the seal mounting recess 17 is measured by the method shown in FIG.

That is, a recess depth measuring member 19 having a known overall bearing radial dimension H is prepared, and the recess depth measuring member 19 is inserted into the seal mounting recess 17 so that the tip is in contact with the bottom surface. The bearing radial direction dimension b of the portion protruding from the seal mounting recess 17 of the recess depth measuring member 19 is measured, and the measured value and the known bearing radial direction dimension H of the entire recess depth measuring member 19 are measured. The depth a of the seal mounting recess 17 is obtained. Specifically, the depth a of the seal mounting recess 17 is:
a = H−b (Formula 4)
It is represented by That is, the depth a of the seal mounting recess 17 can be obtained by measuring the bearing radial direction dimension b of the portion protruding from the seal mounting recess 17 of the recess depth measuring member 19. Measurement of b is easy.

  During operation of the rolling bearing device 1A with a lubricating function, air oil mixed with lubricating oil and compressed air is supplied by an air oil supply device (not shown), and the air oil passes through the lubricating oil supply passage 18 of the housing 9, It enters the inflow hole 13 of the lubricating oil flow path 11 from the flow path inlet 14 opened in the outer diameter surface of the outer ring spacer 7 and is injected into the bearing space from the nozzle hole 12. As a result, the rolling surfaces 2a, 3a, etc. of the inner and outer rings 2, 3 are lubricated.

  An annular seal member 16 is provided at the flow path inlet 14, and the annular seal member 16 seals the clearance between the seal protrusion amount adjusting ring 17 in the seal mounting recess 15 and the inner diameter surface of the housing 9. Since the crushing allowance δ of the annular seal member 16 can be optimally set by the method for setting the crushing allowance for the annular seal member described above, damage to the annular seal member 16 and leakage of the lubricating oil can be prevented.

  FIG. 4 is a partial cross-sectional view of a rolling bearing device with a lubrication function having a different flow path inlet configuration. In the flow path inlet 14 of this rolling bearing device with a lubricating function, an annular elastic member 21 is interposed between the bottom surface of the seal mounting recess 15 and the seal protrusion amount adjusting ring 17. The annular elastic member 21 can be an O-ring similar to the annular seal member 16.

  With this configuration, the annular elastic member 21 is compressed and deformed in a state where the rolling bearing device with a lubrication function is incorporated in the housing 9, and the annular seal member 16 of the seal protrusion amount adjusting ring 17 from the bottom surface of the seal mounting recess 15. The distance l to the contact surface is adjusted. That is, not only the method of arbitrarily setting the bearing radial direction dimension h of the seal protrusion amount adjusting ring 17 but also the method of arbitrarily selecting the annular elastic member 21 having an appropriate elastic deformation rate, the crushing margin of the annular seal member 16 δ can be set.

The bearing radial direction dimension h of the seal protrusion amount adjusting ring 17 in this case is
h = a + (δ ₁ + δ ₂ ) + (D−d) / 2− (w ₁ + w ₂ ) (Formula 5)
It is calculated by. However, δ ₁ is a crushing margin of the annular elastic member 21, δ ₂ is a crushing margin of the annular sealing member 16, w ₁ is a thickness dimension of the annular elastic member 21, and w ₂ is a thickness dimension of the annular sealing member 16.

  FIG. 5 shows a different embodiment of the invention. In this rolling bearing device 1B with a lubricating function, an annular deformation prevention ring 22 as shown in a perspective view of FIG. 6 is provided on the inner periphery of the annular seal member 16. In the illustrated example, the annular seal member 16 and the deformation prevention ring 22 are in contact with the outer end surface of the seal protrusion amount adjusting ring 17 on the same plane. Therefore, the outer end surface of the seal protrusion amount adjusting ring 17 may be a flat surface, and the seal protrusion amount adjusting ring 17 can be formed in a simple shape. The deformation prevention ring 22 may be made of metal or resin, like the seal protrusion amount adjusting ring 17. Both metal and resin are easy to process and are suitable as a material for the deformation prevention ring 22. Except for the fact that the deformation prevention ring 22 is provided, the configuration is basically the same as that of the rolling bearing device with lubrication function 1A except for the differences in the shapes of the cage 5 and the outer ring spacer 7.

  The deformation prevention ring 22 operates as follows. For example, if the deformation prevention ring 22 is not provided as shown in FIG. 12, the annular seal member 16 extends along the inner diameter surface of the housing 9 due to friction with the housing 9 when the rolling bearing device with a lubricating function is incorporated into the housing 9. There is a possibility that the annular seal member 16 is assembled in a partially deformed state as shown in FIG. When such deformation of the annular seal member 16 occurs, the deformed portion 16a of the annular seal member 16 closes the inflow hole 13, and the flow of air oil is obstructed. If the deformation prevention ring 22 is provided, the deformation of the annular seal member 16 can be prevented.

  When the seal protrusion adjustment ring 17 is not provided, as shown in FIG. 13, an annular groove 24 surrounding the inflow hole 13 is provided on the outer diameter surface of the outer ring spacer 7, and the annular seal member 16 is provided in the annular groove 24. The annular seal member 16 can be prevented from being deformed by being fitted. However, in this case, the provision of the annular groove 24 on the outer diameter surface of the outer ring spacer 7 has a problem that the number of processing steps and the processing time increase.

  FIG. 7 illustrates yet another embodiment of the present invention. This rolling bearing device 1C with a lubrication function is also provided with a deformation prevention ring 22 (see FIG. 8) for preventing deformation of the annular seal member 16 as in the above embodiment. The difference from the above embodiment is that a positioning recess 17b is provided on the outer end surface of the seal protrusion adjustment ring 17 so as to be recessed from the portion where the annular seal member is in contact. It is that they were fitted. In the illustrated example, an annular positioning recess 17 b is provided on the inner peripheral portion of the outer end surface of the seal protrusion amount adjusting ring 17.

  When the annular seal member 16 and the deformation prevention ring 22 are in contact with the outer end surface of the seal protrusion amount adjusting ring 17 on the same surface, the annular seal member 16 against the housing 9 is caused by friction between the annular seal member 16 and the housing 9. And the deformation prevention ring 22 may move slightly with the movement. If the deformation prevention ring 22 moves, the position of the hollow portion of the deformation prevention ring 22 that is an air oil passage is displaced, and the flow of air oil may be obstructed. If a part of the deformation prevention ring 22 is fitted in the positioning recess 17b provided on the outer end surface of the seal protrusion amount adjustment ring 17, the movement of the deformation prevention ring 22 can be restricted, and the flow of air oil is always good. Can be maintained.

  Further, unlike the rolling bearing device 1D with a lubrication function shown in FIG. 9, the seal protrusion amount adjusting ring 17 and the deformation prevention ring 22 are not separated, but the deformation prevention ring and seal protrusion amount adjusting ring combined with each other. 23 may be provided. As shown in FIG. 10, the deformation prevention ring combined seal protrusion amount adjusting ring 23 includes a large-diameter ring portion 23a on the inner end side and a small-diameter ring portion 23b on the outer end side, and the large-diameter ring portion 23a is the amount of seal protrusion. The small-diameter ring portion 23 b functions as the deformation prevention ring 22. Thus, if the seal protrusion amount adjusting ring 17 and the deformation prevention ring 22 are integrated, the number of parts can be reduced. In addition, the displacement prevention ring 22 is not displaced.

  FIG. 11 shows an example of a spindle device using the rolling bearing device with lubrication function 1A shown in FIG. This spindle device is for a machine tool. A tool or workpiece chuck (not shown) is attached to one end 30a of the spindle 30, and a drive source such as a motor is connected to a rotation transmission mechanism (the other end 30b). (Not shown). The main shaft 30 is rotatably supported by a pair of rolling bearings 1 separated in the axial direction. In the example of the figure, the pair of rolling bearings 1 are arranged in a back combination. Each rolling bearing 1 constitutes a rolling bearing device 1 </ b> A together with the outer ring spacer 7.

  The inner ring 2 of each rolling bearing 1 is fitted to the outer diameter surface of the main shaft 30, and the outer ring 3 is fitted to the inner diameter surface of the housing 9. These inner and outer rings 2 and 3 are fixed to the main shaft 30 and the housing 9 by an inner ring presser 32 and an outer ring presser 33, respectively. The housing 9 has a double structure of an inner peripheral housing 9a and an outer peripheral housing 9b, and a cooling medium flow path 34 is formed between the inner and outer housings 9a, 9b. The inner peripheral housing 9a is provided with a lubricating oil supply passage 18 and a lubricating oil supply port 18a. The lubricating oil supply port 18a is connected to an air oil supply device (not shown). Further, the inner peripheral housing 9 a is provided with a lubricating oil discharge groove 36 in the vicinity of the installation location of the rolling bearing 1 on the inner peripheral surface, and a lubricating oil discharge path 37 is provided in connection with the lubricating oil discharge groove 36. The housing 9 is installed on a support base 38 and fixed with bolts 39.

In each of the above embodiments, the nozzle forming member is the outer ring spacer 7. However, the nozzle forming member may be the outer ring 3, and the outer ring 3 may be provided with the lubricating oil flow path 11 including the nozzle hole 12 and the inflow hole 13. .
In addition, each of the above embodiments is an example in which the lubrication oil supply system is air oil lubrication, but the lubrication system may be oil mist lubrication in which the lubrication oil is atomized with compressed air or the lubrication oil is used. It is good also as jet lubrication which injects and supplies oil at high speed.

DESCRIPTION OF SYMBOLS 1 ... Rolling bearing 1A, 1B, 1C, 1D ... Rolling bearing apparatus 2 with a lubrication function 2 ... Inner ring 3 ... Outer ring 4 ... Rolling body 7 ... Outer ring spacer (nozzle formation component)
DESCRIPTION OF SYMBOLS 9 ... Housing 11 ... Lubricating oil flow path 12 ... Nozzle hole 13 ... Inflow hole 14 ... Flow path inlet 15 ... Seal attachment recessed part 16 ... Ring seal member 17 ... Seal protrusion amount adjustment ring 17b ... Positioning recessed part 19 ... Recessed depth measurement Member 21 ... annular elastic member 22 ... deformation prevention ring 23 ... deformation prevention ring / sealing protrusion adjustment ring 30 ... main shaft D ... housing inner diameter a ... seal mounting recess depth d ... outer ring spacer outer diameter h ... seal Projection amount adjustment ring bearing radial dimension δ ... Crushing margin of annular seal member

Claims (17)

A rolling bearing having an inner ring, an outer ring, and a rolling element is provided, and an outer ring spacer provided adjacent to the outer ring or a nozzle forming member made of the outer ring, the tip opens toward the bearing space and discharges lubricating oil. A lubricating oil flow path comprising a nozzle hole and an inflow hole communicating with the nozzle hole and having a flow path inlet opened on the outer diameter surface of the nozzle forming component;
The flow path inlet includes a countersink-shaped seal mounting recess provided at the periphery of the opening of the inflow hole, and an elastic body partially protruding from the outer diameter surface of the nozzle forming member and provided in the seal mounting recess An annular seal member formed in the seal mounting recess between the bottom surface of the seal mounting recess and the annular seal member, and forming the nozzle of the annular seal member in accordance with an arbitrarily set bearing radial direction dimension A rolling bearing device with a lubrication function, comprising: a seal protrusion amount adjusting ring for adjusting a protrusion amount from an outer diameter surface of a member.   The rolling bearing device with a lubricating function according to claim 1, wherein the nozzle forming member is the outer ring spacer.   The rolling bearing device with a lubricating function according to claim 1, wherein the nozzle forming member is the outer ring.   4. The rolling bearing device with a lubrication function according to claim 1, wherein an annular elastic member is interposed between a bottom surface of the seal mounting recess and the seal protrusion amount adjusting ring.   5. The rolling bearing device with a lubrication function according to claim 1, wherein an outer end surface of the seal protrusion amount adjusting ring is substantially parallel to an outer diameter surface of the nozzle forming member. 6.   6. The rolling bearing device with a lubrication function according to claim 1, wherein a deformation prevention ring for preventing deformation of the annular seal member is provided on an inner periphery of the annular seal member.   7. The rolling bearing device with a lubricating function according to claim 6, wherein the annular seal member and the deformation prevention ring are in contact with the seal protrusion amount adjusting ring on the same plane.   In Claim 6, the positioning recessed part dented from the location which the said annular seal member contacts is provided in the outer end surface of the said seal protrusion amount adjustment ring, and a part of the said deformation | transformation prevention ring was fitted to this recessed part for positioning. Rolling bearing device with lubrication function.   7. The rolling bearing device with a lubricating function according to claim 6, wherein the seal protrusion amount adjusting ring and the deformation prevention ring are integrally formed.   10. The rolling bearing device with a lubrication function according to claim 6, wherein the deformation prevention ring is made of metal.   10. The rolling bearing device with a lubrication function according to claim 6, wherein the deformation prevention ring is made of resin.   12. The rolling bearing device with a lubrication function according to claim 1, wherein the lubricating oil supply method is air-oil lubrication in which the lubricating oil is supplied with compressed air.   The rolling bearing device with a lubrication function according to any one of claims 1 to 11, wherein the lubrication oil supply method is oil mist lubrication in which the lubricant is atomized with compressed air.   12. The rolling bearing device with a lubrication function according to claim 1, wherein the lubricating oil supply system is jet lubrication in which lubricating oil is injected at a high speed.   15. The rolling bearing device with a lubrication function according to claim 1, wherein the rolling bearing device is used for supporting a machine tool spindle.   16. A method for setting a margin for crushing a seal member in a rolling bearing device with a lubricating function according to claim 1, wherein the outer diameter of the nozzle forming member and the rolling bearing device with a lubricating function are incorporated. By setting the bearing radial direction dimension of the seal protrusion adjustment ring according to the inner diameter of the housing, the depth of the seal mounting recess, and the specifications of the annular seal member, the crushing margin of the annular seal member is set. The sealing member crushing allowance setting method characterized by this.   17. The concave portion depth measuring member having a known overall bearing radial dimension is inserted into the seal mounting concave portion so that the tip is in contact with the bottom surface, and the concave portion depth measuring member is attached to the seal. Measure the bearing radial dimension of the part protruding from the recess, and calculate the depth of the seal mounting recess from the measured value and the known overall bearing radial dimension of the recess depth measuring member. Setting method.

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