JP4441052B2 - Non-rotating structure of nut - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a nut rotation prevention structure in which a nut screwed to the outer periphery of a shaft is prevented from rotating by a rotation preventing member fitted to the outer periphery of the shaft.
[0002]
[Prior art]
As a method for preventing rotation of the nut screwed to the outer periphery of the shaft, a second nut is screwed to the outside of the first nut for fixing the object to be fastened, and an axial load is applied between the two nuts. What is generated (double nut), and what generates an axial load by interposing a spring washer between an object to be fastened and a nut are known. In order to further secure the rotation of the nut, a method using a rotation preventing member is also employed. As an example of such an anti-rotation member, in a state where the anti-rotation member is fitted to the outer periphery of the male screw formed with the groove extending in the axial direction, and the protrusion formed on the anti-rotation member is engaged with the groove to restrict the rotation, There are some which prevent rotation of the nut by caulking the rotation preventing member and integrating it with the nut.
[0003]
[Problems to be solved by the invention]
By the way, the conventional anti-rotation member prevents the rotation of the nut by caulking a part thereof and integrating it with the nut, so that the work of releasing the coupling of the caulking portion when removing the nut is troublesome, Once the nut is removed, there has been a problem that the detent member cannot be reused.
[0004]
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to reliably prevent a nut from rotating by a rotation preventing member and to allow reuse of the rotation preventing member after the nut is removed.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, according to the invention described in claim 1, in the nut detent structure in which the nut screwed to the outer periphery of the shaft is detented by the detent member fitted to the outer periphery of the shaft, A plurality of first engagement grooves are formed at equal intervals in the circumferential direction on the outer periphery of the nut, and at least one first engagement protrusion and at least one second engagement protrusion are formed on the rotation preventing member, and the shaft At least one second engaged groove is formed on the outer periphery of the nut, and the first engagement protrusion of the rotation preventing member is engaged with the first engaged groove of the nut so as not to be relatively rotatable. The non-rotating member second engaging projection is engaged with the mating groove so as not to rotate relative to the nut, and the locking member is locked to the nut with a clip to form an oil reservoir surrounded by the shaft, the nut, and the locking member. , Oil hole through the nut in the axial direction The axial end is communicated with the oil reservoir, the detent structure of the nut to the oil supplied from the oil supply member in the interior of the oil reservoir, wherein the supply to the other axial end of the nut through the oil hole Proposed.
[0006]
According to the above configuration, after the nut is screwed onto the outer periphery of the shaft and the rotation preventing member is fitted to the shaft and locked to the nut by the clip, the first engagement protrusion of the rotation preventing member is the first engagement of the nut. Since the second engaging projection of the rotation preventing member engages with the second engaging groove of the shaft in a relatively non-rotatable manner, the nut rotates to the shaft via the rotation preventing member. The nut is restrained so that the nut is prevented from loosening. Further, since the detent member can be removed from the shaft simply by removing the clip, the nut can be easily loosened and removed, and the detent member can be reused any number of times.
[0007]
In addition, an oil reservoir surrounded by the shaft, the nut, and the non-rotating member is formed, and one end in the axial direction of the oil hole penetrating the nut in the axial direction is communicated with the oil reservoir. By supplying the oil supplied from the other end side in the axial direction of the nut through the oil hole, the oil can be supplied from the one axial end side of the nut to the other end side without any hindrance by the intervening nut. This is particularly effective when an oil passage cannot be formed inside the shaft. Furthermore, since one end of the oil hole in the axial direction is connected to the oil reservoir, the oil supplied from the oil supply member to the oil reservoir can be supplied to the other end in the axial direction of the nut without waste and without interruption. By adopting the anti-rotation member having the above configuration, caulking is not necessary, and there is no possibility that the oil hole of the nut is crushed by the caulking load and the oil supply is hindered.
[0008]
According to the second aspect of the present invention, in addition to the configuration of the first aspect, the smaller one of the phase adjustment pitch between the nut and the anti-rotation member and the phase adjustment pitch between the anti-rotation member and the shaft. Instead, a nut detent structure is proposed in which the difference between the two pitches is set to be small.
[0009]
According to the above configuration, the nut and the non-rotating member are compared with the phase adjusting pitch by changing the engaging phase of the nut and the non-rotating member, and compared with the phase adjusting pitch by changing the engaging phase of the non-rotating member and the shaft. When the change of the engagement phase is combined with the change of the engagement phase of the detent member and the shaft, the phase adjustment pitch can be reduced, and the tightening amount of the nut can be finely adjusted.
[0010]
According to the third aspect of the present invention, in addition to the configuration of the first aspect, the first engaged groove of the nut is disposed at a rotationally symmetric position around the shaft, and the first engagement of the detent member is achieved. A nut detent structure is proposed in which the mating protrusion and the second engagement protrusion are arranged at rotationally symmetric positions around the shaft.
[0011]
According to the above configuration, the position of the center of gravity of the nut and the position of the center of gravity of the anti-rotation member can be made coincident with the center of the shaft, thereby preventing the occurrence of vibrations when the shaft rotates at high speed.
[0012]
According to the invention described in claim 4, in addition to the structure of claim 1, the first engaged groove formed on the outer periphery of the nut can be engaged with the socket of the nut runner. A nut detent structure is proposed.
[0013]
According to the above configuration, when the nut runner is used to rotationally drive the nut, the first engaged groove formed on the outer periphery of the nut can be used. There is no need to form a joint on the nut.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings. 1 to 5 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a main part of a gas turbine engine, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, and FIG. FIG. 4 is a perspective view of the nut and the rotation preventing member, and FIG. 5 is a perspective view of the nut and the nut runner.
[0015]
FIG. 1 shows a part of a gas turbine engine. A hollow inner shaft 11 that supports a low-pressure turbine blade and a low-pressure compressor blade (not shown), and a hollow outer shaft that supports a high-pressure turbine blade and a high-pressure compressor blade (not shown). The shaft 12 is coaxially disposed, and the shaft end portion of the outer shaft 12 is supported by the bearing housing 14 via the roller bearing 13. The roller bearing 13 includes an inner race 15 that fits to the outer peripheral surface of the outer shaft 12, an outer race 16 that fits to the inner peripheral surface of the bearing housing 14, and a large number of rollers disposed between the inner race 15 and the outer race 16. It comprises rollers 17 and retainers 18 that prevent the rollers 17 from falling off.
[0016]
A male screw 12a is formed on the outer periphery of the outer shaft 12, and a female screw 20a formed on the inner periphery of the nut 20 is screwed into the male screw 12a. The nut 20 presses the inner race 15 of the roller bearing 13 leftward in the figure, and presses the inner race 15 against the rear coupling 21 fitted to the outer periphery of the outer shaft 12 to fix it in the axial direction. Then, the nut 20 screwed into the outer shaft 12 is prevented from rotating by a rotation preventing member 22 fitted to the outer periphery of the outer shaft 12.
[0017]
As is obvious from FIGS. 2 to 4, the main body portion 20 b of the nut 20 having an internal thread 20 a formed on the inner peripheral surface has an annular shape that contacts the inner race 15 at the front end (left side in FIG. 1). The pressing surface 20c is formed, and nine protrusions 20d on the outer periphery and nine first engaged grooves 20e are alternately formed in the circumferential direction. The nine first engaged grooves 20e... Extend in the axial direction, and their mutual intervals are constant and all 40 °. On the inner peripheral surface of the protrusions 20d, clip grooves 20f are fitted, respectively, into which clips 23 described later are fitted. Further, a large number of oil holes 20g... Penetrate in the axial direction so as to surround the outside of the female screw 20a of the nut 20.
[0018]
An annular detent member 22 fitted to the outer periphery of the outer shaft 12 includes an annular protrusion 22b that protrudes radially outward from an axially intermediate portion of the outer peripheral surface of the cylindrical main body portion 22a, and an inner peripheral surface of the main body portion 22a. An annular protrusion 22c protruding radially inward from the rear end (right side in FIG. 1), a step 22d formed on the front inner peripheral surface of the main body 22a, and radially outward from the front of the step 22d A flange 22e that extends, three first engaging protrusions 22f that protrude forward from the radially outer end of the flange 22e, and two that protrude radially inward from the axially intermediate portion of the inner peripheral surface of the main body 22a Second engaging projections 22g, 22g. The three first engaging protrusions 22f are formed at intervals of 120 °, and the two second engaging protrusions 22g and 22g are formed at intervals of 180 °. Eight second engaged grooves 12b... Are formed in the axial direction behind the external thread 12a of the outer shaft 12 at 45 ° intervals, and 180 ° intervals further rearward of these second engaged grooves 12b. Two notches 12c and 12c are formed.
[0019]
The oil jet 24 supported by the bearing housing 14 includes a nozzle member 27 fixed to the lower portion of a support arm 25 protruding downward from the bearing housing 14 with a bolt 26, and is connected to an oil pump 28 to be supported by the support arm 25. The oil passage 25a extending downward in the nozzle communicates with a nozzle 27a formed obliquely in the nozzle member 27. The contact portion between the support arm 25 and the nozzle member 27 is sealed with two seal members 29 and 29. The nozzle 27a is directed to a gap α between the outer peripheral surface of the outer shaft 12 and the tip of the annular protrusion 22c of the rotation preventing member 22, and the main body 22a and the annular protrusion 22c of the rotation preventing member 22 are in front of the gap α. An annular oil reservoir 30 surrounded by the outer peripheral surface of the outer shaft 12 is formed. The rear end of the oil hole 20g penetrating the nut 20 in the axial direction communicates with the oil reservoir 30, and the front end is formed in a plurality of oil grooves 15a formed in the axial direction on the inner peripheral surface of the inner race 15 of the roller bearing 13. Communicate. A plurality of oil holes 15b extending in the radial direction from the oil grooves 15a communicate with the vicinity of the rollers 17.
[0020]
Next, the operation of the embodiment of the present invention having the above configuration will be described.
[0021]
In order to press and fix the roller bearing 13 fitted to the outer periphery of the outer shaft 12 to the left, the female screw 20a of the nut 20 is screwed into the male screw 12a of the outer shaft 12 using a nut runner 31 shown in FIG. Nine protrusions 32a are formed on the socket 32 of the nut runner 31. By engaging these protrusions 32a with the nine first engaged grooves 20e of the nut 20, the nut 20 is moved. The roller bearing 13 can be fastened by being rotationally driven. Subsequently, in the state where the phase of the two second engaging projections 22g and 22g of the rotation preventing member 22 is matched with the phase of the two notches 12c and 12c of the shaft end portion of the outer shaft 12, Is moved in the axial direction and fitted from the axial end of the outer shaft 12.
[0022]
Subsequently, the three first engaging protrusions 22f of the rotation prevention member 22 are engaged with three of the nine first engaged grooves 20e of the nut 20, and at the same time, the rotation prevention member 22 is engaged. The two second engaging protrusions 22g, 22g are engaged with two of the eight second engaged grooves 12b of the outer shaft 12. Then, the clip 23 is compressed and engaged with the clip groove 20 f of the nut 20 from the inside in the radial direction, and the rotation preventing member 22 is locked so as not to fall off from the nut 20. In the state in which the rotation prevention is performed, the two second engagement protrusions 22g and 22g of the rotation prevention member 22 are rotated relative to two of the eight second engagement grooves 12b. Engagement is impossible, and rotation of the rotation preventing member 22 with respect to the outer shaft 12 is restricted, and the three first engagement protrusions 22 f of the rotation prevention member 22 are nine first engaged grooves of the nut 20. 20e... Engages with three of 20e... So that rotation of the nut 20 relative to the rotation preventing member 22 is restricted. As a result, the rotation of the nut 20 with respect to the outer shaft 12 is restricted via the anti-rotation member 22, and the loosening of the nut 20 due to vibration or the like is reliably prevented.
[0023]
In this way, when the nut 20 is locked using the locking member 22, there is no need to caulk the locking member 22, and the locking member 22 is simply locked to the nut 20 with the clip 23. For this reason, not only the caulking work of the rotation preventing member 22 after screwing the nut 20 and the separation work of the caulking part when loosening the once tightened nut 20 are unnecessary, and the workability is greatly improved. The rotation preventing member 22 can be used repeatedly, and the economy is improved. When the clip 23 is removed and the anti-rotation member 22 is separated from the nut 20, the tool is engaged with the annular protrusion 22 b protruding from the outer periphery of the main body 22 a of the anti-rotation member 22, so that the shaft end side of the outer shaft 12 is engaged. Just pull it out.
[0024]
The coupling phase between the nut 20 and the rotation preventing member 22 can be adjusted at a pitch of 40 ° obtained by dividing 360 ° by 9 that is the number of the first engaged grooves 20e of the nut 20 and the rotation preventing member. The coupling phase between the outer shaft 12 and the outer shaft 12 can be adjusted at a pitch of 45 ° obtained by dividing 360 ° by 8 which is the number of the second engaged grooves 12b of the outer shaft 12, so that the difference between 40 ° and 45 ° The tightening amount of the nut 20 with respect to the outer shaft 12 can be finely adjusted at intervals of 5 °.
[0025]
This is because the engagement positions of the first engagement protrusions 22f of the anti-rotation member 22 with respect to the first engagement grooves 20e of the nut 20 are 40 ° in the left-right direction (that is, the nine first engagements of the nut 20). If it is assumed that the groove 20e is shifted by one pitch), the engagement of the second engaged grooves 12b of the outer shaft 12 with the second engaging protrusions 22g and 22g of the rotation preventing member 22 is 45 ° (the outer shaft 12). The eight second engaged grooves 12b... Can be adjusted only at intervals of one pitch), so that the anti-rotation member 22 cannot be mounted as it is. Therefore, if the nut 20 and the anti-rotation member 22 that engages with the nut 20 are rotated by 5 ° in the left-right direction, the two second engagement protrusions 22g and 22g of the anti-rotation member 22 are eight of the outer shaft 12. The second engaged grooves 12b... Are engaged with two new ones of the second engaged grooves 12b.
[0026]
Thus, the phase adjustment pitch (40 ° in the embodiment) between the nut 20 and the rotation preventing member 22 is different from the phase adjustment pitch (45 ° in the embodiment) between the rotation preventing member 22 and the outer shaft 12. Thus, the anti-rotation member 22 can be mounted without hindrance while finely adjusting the tightening amount of the nut 20 with respect to the outer shaft 12 at intervals of 5 ° corresponding to the difference between the two pitches.
[0027]
In short, when the phase adjustment pitch between the nut 20 and the detent member 22 is P1 (40 ° in the embodiment) and the phase adjustment pitch between the detent member 22 and the outer shaft 12 is P2 (45 ° in the embodiment). If the difference between the pitch P1 and the pitch P2 is set to be smaller than the smaller one of the pitch P1 and the pitch P2, the tightening amount of the nut 20 with respect to the outer shaft 12 can be finely adjusted. In the embodiment, 5 ° which is the difference between the pitch P1 and the pitch P2 is set to be smaller than the smaller pitch P1 (40 °) of the pitch P1 and the pitch P2, and therefore fine adjustment at intervals of 5 ° is possible. It becomes possible.
[0028]
Temporarily, in the embodiment, the number of the second engaged grooves 12b of the eight outer shafts 12 is reduced to four, and the phase adjustment pitch P2 between the detent member 22 and the outer shaft 12 is changed from 45 ° to 90 °. In this case, the difference between the pitch P1 and the pitch P2 is 50 °, which is larger than the smaller pitch P1 (40 °), and the phase adjustment pitch that was originally possible, that is, the nut 20 and the non-rotating member 22 is obtained. The phase adjustment pitch between them cannot be further reduced to P1 (40 °).
[0029]
The oil supplied from the oil pump 28 to the oil jet 24 to lubricate the roller bearing 13 that supports the outer shaft 12 to the bearing housing 14 passes from the nozzle 27a of the nozzle member 27 through the oil passage 25a of the support arm 25. The oil is discharged and passed through a gap α between the outer peripheral surface of the outer shaft 12 and the tip of the annular protrusion 22 c of the rotation preventing member 22 and supplied to the oil reservoir 30. The oil accumulated in the oil reservoir 30 is supplied from the oil holes 20g of the nut 20 to the rollers 17 through the oil grooves 15a of the inner race 15 and the oil holes 15b of the roller bearing 13, and is used for lubricating the roller bearing 13. Is done.
[0030]
As described above, since the nut 20 is interposed between the roller bearing 13 to be lubricated, even when oil cannot be directly supplied to the roller bearing 13 from the oil jet 24, the oil is supplied through the oil holes 20g of the nut 20. By supplying, the roller bearing 13 can be sufficiently lubricated even when the outer shaft 12 rotates at a high speed. In particular, as in this embodiment, the outer shaft 12 into which the nut 20 is screwed is a hollow shaft, which is effective when an oil passage for supplying oil cannot be formed inside the hollow shaft.
[0031]
Further, since the oil reservoir 30 is exposed to the inlet of the oil hole 20g ... of the nut 20, the oil ejected from the nozzle 27a of the nozzle member 27 can be supplied to the roller bearing 13 without waste and without interruption. In addition, since the swaging member 22 having the above-described configuration is used, the caulking process is unnecessary, so that there is no possibility that the oil holes 20g of the nut 20 are crushed by the caulking process load and the oil supply is hindered.
[0032]
As mentioned above, although the Example of this invention was explained in full detail, this invention can perform a various design change in the range which does not deviate from the summary.
[0033]
For example, the detent structure of the present invention can be applied to any application other than a gas turbine engine. In addition, the number of first engaged grooves 20e of the nut 20, the number of second engaged grooves 12b of the outer shaft 12, the first engaging protrusions 22f of the rotation preventing member 22, and the second engaging protrusions 22g. The number of is not limited to an Example, It can change suitably.
[0034]
【The invention's effect】
As described above, according to the first aspect of the present invention, when the nut is engaged with the shaft after the nut is screwed onto the outer periphery of the shaft and the nut is clipped to the nut, The engaging protrusion engages with the first engaged groove of the nut in a relatively non-rotatable manner, and the second engaging protrusion of the rotation preventing member engages with the second engaged groove of the shaft in a relatively non-rotatable state. The nut is non-rotatably restrained by the shaft through the stopper member, and the nut is prevented from loosening. Further, since the detent member can be removed from the shaft simply by removing the clip, the nut can be easily loosened and removed, and the detent member can be reused any number of times.
[0035]
In addition, an oil reservoir surrounded by the shaft, the nut, and the non-rotating member is formed, and one end in the axial direction of the oil hole penetrating the nut in the axial direction is communicated with the oil reservoir. By supplying the oil supplied from the other end side in the axial direction of the nut through the oil hole, the oil can be supplied from the one axial end side of the nut to the other end side without any hindrance by the intervening nut. This is particularly effective when an oil passage cannot be formed inside the shaft. Furthermore, since one end of the oil hole in the axial direction is connected to the oil reservoir, the oil supplied from the oil supply member to the oil reservoir can be supplied to the other end in the axial direction of the nut without waste and without interruption. By adopting the anti-rotation member having the above configuration, caulking is not necessary, and there is no possibility that the oil hole of the nut is crushed by the caulking load and the oil supply is hindered.
[0036]
According to the second aspect of the present invention, the phase adjustment pitch is changed by changing the engagement phase of the nut and the rotation prevention member, and is compared with the phase adjustment pitch by changing the engagement phase of the rotation prevention member and the shaft. Therefore, the phase adjustment pitch when the change of the engagement phase of the nut and the rotation prevention member and the change of the engagement phase of the rotation prevention member and the shaft are used together can be reduced, and the tightening amount of the nut can be finely adjusted. it can.
[0037]
According to the third aspect of the present invention, the center of gravity position of the nut and the center of gravity of the rotation preventing member are made to coincide with the center of the shaft, so that the occurrence of vibration during high-speed rotation of the shaft can be prevented.
[0038]
According to the invention described in claim 4, when the nut runner is used to rotationally drive the nut, the first engaged groove formed on the outer periphery of the nut can be used. It is not necessary to form a special engaged portion to be engaged with the nut.
[Brief description of the drawings]
1 is a longitudinal sectional view of a main part of a gas turbine engine. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. [Fig.5] Perspective view of nut and nutrunner [Explanation of symbols]
12 Outer shaft (shaft)
12b Second engaged groove 20 Nut 20e First engaged groove
20g oil hole 22 anti-rotation member 22f first engagement protrusion 22g second engagement protrusion 23 clip
27 nozzle member (oil supply member)
30 oil reservoir 31 nut runner 32 socket

Claims (4)

In the nut detent structure in which the nut (20) screwed to the outer periphery of the shaft (12) is detented by the detent member (22) fitted to the outer periphery of the shaft (12),
A plurality of first engaged grooves (20e) are formed at equal intervals in the circumferential direction on the outer periphery of the nut (20), and at least one first engaging protrusion (22f) and at least one are provided on the rotation preventing member (22). Two second engaging protrusions (22g) and at least one second engaged groove (12b) on the outer periphery of the shaft (12),
The first engagement protrusion (22f) of the detent member (22) is engaged with the first engagement groove (20e) of the nut (20) in a relatively non-rotatable manner, and the second engagement of the shaft (12). Engage the second engagement protrusion (22g) of the detent member (22) in the groove (12b) so as not to be relatively rotatable,
Lock the locking member (22) to the nut (20) with the clip (23) ,
An oil reservoir (30) surrounded by the shaft (12), the nut (20), and the anti-rotation member (22) is formed, and one end of the oil hole (20g) in the axial direction penetrates the nut (20) in the axial direction. Is communicated with the oil reservoir (30), and the oil supplied from the oil supply member (27) into the oil reservoir (30) is supplied to the other axial end of the nut (20) through the oil hole (20g). A nut detent structure characterized by that. Nut (20) and a phase adjustment pitch between detent member (22), retainer (22) and a shaft (12) than the smaller one of the phase adjustment pitch between, the two pitch The nut detent structure according to claim 1, wherein the difference is set to be small.   The first engaged groove (20e) of the nut (20) is disposed at a rotationally symmetric position around the shaft (12), and the first engagement protrusion (22f) and the second engagement of the detent member (22) are arranged. The nut rotation-preventing structure according to claim 1, wherein the protrusion (22g) is arranged at a rotationally symmetric position about the shaft (12).   The nut according to claim 1, wherein the first engaged groove (20e) formed on the outer periphery of the nut (20) is engageable with the socket (32) of the nut runner (31). Non-rotating structure.

Images