JP2010101455A - Structure and method for connecting motor shaft and hollow shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the service life of a device using the structure for connecting a motor shaft and a hollow shaft to each other by preventing fretting. <P>SOLUTION: This structure for connecting a motor shaft and a hollow shaft to each other includes: the motor shaft 110; the hollow shaft 124, into which the motor shaft 110 is fitted in the axial direction and which is connected to the motor shaft 110 to transmit power by a key 112 and a key groove 110A as power transmitting means; and a holding cover 118 engaged with the motor shaft 110 and the hollow shaft 124. The motor shaft 110, the hollow shaft 124 and the holding cover 118 form a lubricant holding space for holding a lubricant between the motor shaft 110 and the hollow shaft 124. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a connection structure and a connection method between a motor shaft and a hollow shaft.

  Conventionally, when a motor shaft is connected to a hollow shaft of a reduction gear so that power can be transmitted, a motor shaft having an outer diameter slightly smaller than the inner diameter of the hollow shaft is fitted in the axial direction, and the inner periphery of the hollow shaft and the motor are A technique is widely adopted in which keys are locked in key grooves formed on the outer periphery of the shaft.

  Such a method uses “gap fitting” in which a minute gap is left between the hollow shaft and the motor shaft or between the key and the key groove (unlike so-called frictional power transmission means). ing. The gap fitting has an advantage that assembly and disassembly can be easily performed at room temperature without using a special tool, and power transmission is also reliable.

  However, the connection structure using the gap fitting has a problem that fine wear called “fretting” due to the minute gap is likely to occur.

  When fretting occurs, problems such as excessive wear of the hollow shaft and the motor shaft, or the motor shaft sticking to the hollow shaft and being unable to be disassembled occur.

  In order to avoid such a problem, a connection structure between a shaft hole member and a shaft described in Patent Document 1 shown in FIG. 5 has been proposed. The details are as follows. Except for the portion of the key groove 10A between the outer periphery of the motor shaft 10 and the inner periphery of the hollow shaft 24 which is a shaft hole member, the resin bush 2 is interposed, and the inner periphery of the hollow shaft 24 is inserted. And “fretting” due to a minute gap between the motor shaft 10 and the outer periphery of the motor shaft 10.

JP 2002-206560 A

  However, even if the connection structure described in Patent Document 1 is used, there is still a possibility that “fretting” may occur in the key and the key groove for locking the motor shaft and the hollow shaft. In fact, there is a need for a longer life for the connection between the motor shaft and the hollow shaft, and the structure for connecting the motor shaft and the hollow shaft for power transmission (here, the key and the keyway (Equivalent)), fretting measures have been demanded.

  Therefore, the present invention has been made to solve the above-described problems, and it is possible to prevent the fretting and to extend the life of the apparatus that employs the connection structure between the motor shaft and the hollow shaft. It is an object to provide a connection structure and a connection method with a shaft.

  The present invention relates to a motor shaft, a hollow shaft that is fitted in the axial direction of the motor shaft and connected to the motor shaft by power transmission means so as to be able to transmit power, and a holding cover that engages the motor shaft and the hollow shaft. And the motor shaft, the hollow shaft, and the holding cover form a lubricant holding space for holding the lubricant between the motor shaft and the hollow shaft, thereby solving the problem. It is a thing.

  The “lubricant holding space” refers to a space in which the lubricant is held, and means that the lubricant stays in the space even if the lubricant moves in the space. In the present invention, this “lubricant holding space” is formed by the motor shaft, the hollow shaft, and the holding cover, so that the lubricant leaks out of these (the motor shaft, the hollow shaft, and the holding cover). Can be prevented. For this reason, it becomes possible to hold | maintain a lubricant for a long time to the connection part of a motor shaft and a hollow shaft. That is, since the lubricant can be constantly supplied to the connecting portion of the structure in which the motor shaft and the hollow shaft are connected so as to be able to transmit power by the power transmission means such as the key and the key groove, fretting can be prevented, and This state can be maintained for a long time.

  In the present application, the power transmission means specifically includes a key structure composed of a key and a key groove, a spline coupling, a so-called D-cut coupling, and the like. It means the uneven structure that can be visually confirmed. In the present application, the term “engagement” is used as a high-level concept such as fixing, fitting, fitting, and circumferential arrangement.

  According to the present invention, it is possible to prevent the fretting and to prolong the life of the apparatus that employs the connection structure between the motor shaft and the hollow shaft.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic sectional view of a portion showing a connection structure between a motor shaft and a hollow shaft of a rotation transmission device according to a first embodiment of the present invention, and FIG. 2 is a graph showing experimental results of the wear amount with respect to the number of operation cycles. .

  In this embodiment, a coupling for connecting a motor shaft 110 that is an output shaft of a motor (not shown) of the rotation transmission device 100 and a hollow type input shaft (referred to as a hollow shaft 124) of the speed reduction mechanism. The present invention is applied to this part.

  First, the configuration of the present embodiment will be described with reference to FIG.

  A motor shaft 110 of a motor (not shown) is a solid shaft that is rotatably supported by a motor flange 142, and a key groove 110A is formed in a part of the outer periphery and in the axial direction. A key 112 is disposed in the keyway 110A. Corresponding to the key 112, a key groove (not shown) is also provided in the axial direction on the inner periphery of the hollow shaft 124.

  A collar 114 is integrally fixed to the motor flange 142 side of the motor shaft 110. The holding cover 118 is attached and fixed to a ring-shaped auxiliary member 130 attached to the bearing housing 138. That is, in this embodiment, the holding cover 118 is fixedly supported by the bearing housing 138 without rotating with the motor shaft 110. The holding cover 118 is provided around the hollow shaft 124 via an oil seal 126 supported by the auxiliary member 130. The holding cover 118 is provided around the motor shaft 110 via an oil seal 116 and a collar 114. The oil seal 126 is attached in order to prevent lubricant leakage due to the internal pressure of the lubricant in the gap 118D.

  The holding cover 118 is provided with one or more stop lids 122, openings 118B, and flow paths 118C. The channel 118C communicates with the gap 118D. The gap 118 </ b> D is configured by a gap between the collar 114 and the hollow shaft 124 and between the oil seals 116 and 126. That is, the lubricant is disposed inside the hollow shaft 124, and the motor shaft 110 is fitted inside the hollow shaft 124. Then, the lubricant is pushed by the motor shaft 110, and the key portion (including the key groove on the hollow shaft 124 side) including the key 112 and the key groove 110A is surely filled with the lubricant. The overflowing lubricant can be discharged from the opening 118B by filling the gap 118D and the flow path 118C with the hollow shaft 124.

  The hollow shaft 124 is a rotating body-shaped member closed by a bevel shaft 134 on the non-motor flange side, and has an opening on the motor flange side in the axial direction. A motor shaft 110 is fitted inside the hollow shaft 124, and a key groove (not shown) corresponding to the key 112 is formed on the inner periphery.

  When the motor shaft 110 is fitted into the hollow shaft 124 and the holding cover 118 is provided around the hollow shaft 124 and the collar 114 via the oil seals 116 and 126, the axial direction between the holding cover 118 and the collar 114, In addition, a gap 118 </ b> D is formed between the oil seals 116 and 126. At this time, since the holding cover 118, the motor shaft 110, and the collar 114 are configured to be a lid with respect to the hollow shaft 124, a closed “lubricant holding space” is provided by attaching the stopper lid 122 to the opening 118 </ b> B. ”Is formed, and the lubricant can be prevented from leaking to the outside.

  The hollow shaft 124 is rotatably supported via two bearings 128 and 132 (for example, tapered roller bearings). The bearing 128 and the oil seal 126 are supported by a ring-shaped auxiliary member 130. The auxiliary member 130 is fixed to the bearing housing 138 by bolts 148. Since the bearing housing 138 also supports the bearing 132, the hollow shaft 124 is supported by the bearing housing 138. A bevel shaft 134 formed with a bevel pinion is attached to the end of the hollow shaft 124 on the side opposite to the motor flange. The bevel pinion meshes with a bevel gear (not shown), the output of the motor shaft 110 is decelerated, and the rotation direction is changed by 90 degrees.

  The bearing housing 138 is fixed by bolts and nuts 150 to a bevel gear and other reduction mechanisms that mesh with the bevel pinion of the bevel shaft 134 and a housing 136 that supports the output shaft. The bearing housing 138 is fixed integrally with the motor flange 142 via the mounting flange 140 with bolts 146 and the like. Here, the mounting flange 140 is provided with one or more through holes 140A. In FIG. 1, the discharge pipe 152 is inserted into the through hole 140A and attached to the opening 118B.

  Next, a method for connecting the motor shaft and the hollow shaft in the present embodiment will be described.

  First, a lubricant is disposed inside the hollow shaft 124. At this time, it is desirable to arrange as much lubricant as possible.

  An oil seal 116 is fitted in advance on the inner side of the holding cover 118 on the motor flange side. Then, the holding cover 118 is attached to the auxiliary member 130 so as to sandwich the oil seal 126. At the same time, the mounting flange 140 is attached to the bearing housing 138. At this time, one of the stopper lids 122 is removed from the opening 118B of the holding cover 118, and the discharge pipe 152 is attached to the opening 118B via the through hole 140A.

  Next, the motor shaft 110 is fitted inside the hollow shaft 124. At the time of insertion, as much lubricant as possible is applied to the key portions of the key groove 110A and the key 112. Therefore, grease is preferable as the lubricant.

  When the motor shaft 110 is fitted while the collar 114 is in sliding contact with the oil seal 116, the axial distance of the gap 118D between the hollow shaft 124 and the collar 114 is shortened. At the same time, the motor shaft 110 squeezes the lubricant inside the hollow shaft 124, and the lubricant causes the air outside the motor 110 and the inside of the hollow shaft 124 including the periphery of the key portion 110 </ b> A and the key portion of the key 112. Then, air is pushed out from the gap 118D, and air is pushed out from the flow path 118C of the holding cover 118, and the lubricant is discharged from the opening 118B to the discharge pipe 152. That is, the lubricant is discharged from the opening 118B of the lubricant holding space formed by the hollow shaft 124, the motor shaft 110, and the holding cover 118.

  The motor shaft 110 is fitted into the hollow shaft 124 to a predetermined length, and it is confirmed that the lubricant has overflowed from the opening 118B, and the mounting flange 140 is fixedly mounted on the motor flange 142. Then, the discharge pipe 152 is removed, and a stopper lid 122 is attached to the opening 118B through the through hole 140A for sealing. When a plurality of stopper lids 122 are present at the time of sealing, the pressure of the lubricant in the lubricant holding space can be adjusted by adjusting the attaching force of the stopper lid 122 that was previously attached.

  Next, in the present embodiment, the result of actually confirming the influence of fretting by experiments will be described with reference to FIG.

  In FIG. 2, the horizontal axis indicates the number of operating cycles, and the vertical axis indicates the total wear amount of the key 112 and the key groove 110A. Here, one operation cycle is defined when a certain inertia load is accelerated / decelerated within a predetermined acceleration / deceleration time. In FIG. 2, a graph A plotted with cross marks is a case of a conventional motor shaft and hollow shaft connection structure without the holding cover 118 and using no lubricant. On the other hand, a graph C plotted with triangular marks indicates actual measurement values in the present embodiment. The graph B plotted with a dotted line is a line obtained from the target value. Note that a graph D plotted with circles indicates measured values in the second embodiment (described later) having a more excellent effect.

  As is apparent from FIG. 2, in the present embodiment, the amount of wear can be significantly reduced compared to the conventional case, and can be made equal to or less than the value obtained from the target value (the conventional example has a time when the operation cycle is less than 200,000 times). Fretting had occurred).

  In this way, in the present embodiment, the lubricant can be reliably held in the key portion between the key groove 110A and the key 112, and the lubricant can be prevented from flowing out. At this time, in the present embodiment, the oil seals 116 and 126 are used so that the holding cover 118 is not rotated together with the motor shaft 110, so that the discharge pipe 152 can be kept attached or easily opened to the opening 118 </ b> B. The discharge pipe 152 can be attached and detached, and the stopper lid 122 can be attached and detached.

  That is, the lubricant holding space is formed by the motor shaft 110, the hollow shaft 124, and the holding cover 118, thereby preventing the lubricant from leaking outside the motor shaft 110, the hollow shaft 124, and the holding cover 118. Can do. For this reason, it becomes possible to hold | maintain a lubricant for a long period in the connection part of the motor shaft 110 and the hollow shaft 124. FIG. That is, since the lubricant can be constantly supplied to the key part of the key 110A and the key groove 112 which is a connecting part of the structure for connecting the motor shaft 110 and the hollow shaft 124 so that power can be transmitted by the power transmission means, fretting can be prevented. And it becomes possible to hold | maintain the state over a long period of time.

  That is, it is possible to prevent the fretting and to extend the life of the apparatus adopting the connection structure of the motor shaft 110 and the hollow shaft 124.

  Next, a connection structure between the motor shaft and the hollow shaft of the rotation transmission device according to the second embodiment will be described with reference to FIG.

  This embodiment is different from the form in which the motor shaft and the hollow shaft and the holding cover are engaged with each other in the first embodiment. Therefore, the description including the portion is partially overlapped with the description of the first embodiment. .

  A cylindrical holding cover 218 is fixed to the outer periphery of the motor shaft 210 by, for example, press fitting. For this reason, the holding cover 218 rotates integrally with the motor shaft 210 and the hollow shaft 224. The holding cover 218 includes a portion 218A1 that comes into contact with the outer periphery of the motor shaft 210, and an engaging portion 218A2 that extends toward the non-motor flange 242 in the axial direction. An O-ring groove 218E is provided on the inner peripheral surface 218AA of the engaging portion 218A2. The engaging portion 218A2 is fitted to the outer peripheral surface 224A of the hollow shaft 224 fitted into the motor shaft 210 via the O-ring 220 disposed in the O-ring groove 218E. That is, the hollow shaft 224 and the engaging portion 218A2 have an overlap in the radial direction. The O-ring 220 and the oil seal 226 are supported on the same processed surface of the outer peripheral surface 224A. The oil seal 226 is supported by the inner peripheral surface 230 </ b> A of the auxiliary member 230. The outer diameter d of the engaging portion 218A2 is smaller than the inner diameter D of the inner peripheral surface 230A of the auxiliary member 230, and a part of the engaging portion 218A2 enters inside the auxiliary member 230 and engages with the hollow shaft 224 in the radial direction. The portion 218A2 and a part of the auxiliary member 230 are overlapped, and shortening in the axial direction is achieved. In addition, the oil seal 226 is provided in order to prevent lubricant leakage from the bearing 228 side in the opposite direction to that in the first embodiment.

  The holding cover 218 is provided with openings 218B for supplying and discharging the lubricant at one or more locations on the outer periphery thereof. The opening 218B can be sealed by attaching a stop lid 222 (indicated by an arrow in FIG. 3). The opening 218B communicates with the gap 218D through a flow path 218C formed inside the holding cover 218. That is, the lubricant is disposed inside the hollow shaft 224 and the motor shaft 210 is fitted inside the hollow shaft 224. Then, the lubricant is pushed by the motor shaft 210 and the key portion (including the key groove on the hollow shaft 224 side) made up of the key 210 and the key groove 212 is surely filled with the lubricant. The overflowing lubricant can be discharged from the opening 218B by filling the gap between the hollow shaft 224, the gap 218D, and the flow path 218C.

  The hollow shaft 224 is a rotating body-shaped member closed by a bevel shaft 234 on the side opposite to the motor flange, and has an opening on the motor flange side in the axial direction. A motor shaft 210 is fitted inside the hollow shaft 224, and a key groove (not shown) corresponding to the key 212 is formed on the inner periphery.

  When the motor shaft 210 is fitted to the hollow shaft 224 and the holding cover 218 is fitted to the hollow shaft 224 via the O-ring 220, a gap 218D is formed between the holding cover 218 and the hollow shaft 224 in the axial direction. Is formed. At this time, since the holding cover 218 and the motor shaft 210 serve as a lid with respect to the hollow shaft 224, a closed “lubricant holding space” is formed by attaching the stopper lid 222 to the opening 218B. The lubricant can be prevented from leaking outside.

  The mounting flange 240 is provided with one or more through holes 240A. As shown by the arrows in FIG. 3, by inserting a jig or the like into the through holes 240A, the stopper lid 222 can be attached to or detached from the opening 218B. Attachment / removal to / from the opening 218B can be performed.

  Next, a method for connecting the motor shaft and the hollow shaft in the present embodiment will be described.

  First, a lubricant is disposed inside the hollow shaft 224. At this time, it is desirable to arrange as much lubricant as possible.

  A holding cover 218 is attached to the motor shaft 210. At this time, one of the stopper lids 222 is removed from the opening 218B of the holding cover 218. Then, the O-ring 220 is disposed in the O-ring groove 218E of the engaging portion 218A2. The through hole 240A of the mounting flange 240 attached to the motor flange 242 is formed so as to be on the same plane as the stopper lid 222.

  Next, the motor shaft 210 is fitted inside the hollow shaft 224. At the time of insertion, as much lubricant as possible is applied to the key portions of the key groove 210A and the key 212. Therefore, grease is preferable as the lubricant.

  As the motor shaft 210 is fitted, the axial length that engages the outer peripheral surface 224A of the hollow shaft 224 of the engaging portion 218A2 of the holding cover 218 increases, and the axial distance of the gap 218D decreases. At the same time, the motor shaft 210 squeezes the lubricant inside the hollow shaft 224, and the lubricant causes the lubricant to move outside the motor shaft 210 and the inside of the hollow shaft 224 including the periphery of the key portion of the key groove 210 </ b> A and the key 212. The air is pushed out, and air is pushed out from the gap 218D between the hollow shaft 224 and the holding cover 218, and air is further pushed out from the flow path 218C of the holding cover 218, and the lubricant is discharged from the opening 218B. That is, the lubricant is discharged from the opening 218B of the lubricant holding space constituted by the hollow shaft 224, the motor shaft 210, and the holding cover 218. The lubricant can be discharged by attaching a discharge pipe to the opening 218B through the through hole 240A.

  The motor shaft 210 is fitted into the hollow shaft 224 to a predetermined length, and it is confirmed that the lubricant has overflowed from the opening 218B, and the mounting flange 240 is mounted and fixed to the bearing housing 238. Then, the discharge pipe is removed and a stopper lid 222 is attached to the opening 218B through the through hole 240A to perform sealing. When a plurality of stopper lids 222 are present at the time of sealing, the pressure of the lubricant in the lubricant holding space can be adjusted by adjusting the attaching force of the stopper lid 222 that was previously attached.

  In this way, the lubricant can be reliably held in the key portion between the keyway 210A and the key 212, and the lubricant can be prevented from flowing out.

  FIG. 2 shows the result of actually confirming the influence of fretting by experiments with respect to this embodiment.

  The graph D plotted with circles shows the actual measurement values in the present embodiment, but the amount of wear can be significantly reduced even compared to the first embodiment. This is because the present embodiment is further developed from the first embodiment, and the constituent members are integrated without moving each other to make the lubricant holding space a higher sealed environment. In the first embodiment, the hollow shaft and the motor shaft are rotated with respect to the holding cover. However, in this embodiment, the motor shaft 210, the holding cover 218, and the hollow shaft 224 are integrally rotated. . For this reason, since the seal portion does not slide, good sealing performance can be maintained over a long period of time. Further, instead of the two oil seals used in the first embodiment, in this embodiment, only one oil seal (O-ring 222) for sliding could be used. That is, the sealing performance can be further improved by reducing the number of oil seals (O-rings 222). Here, since the pressure resistance of the O-ring 222 is significantly larger than that of the oil seal, a higher sealing environment can be formed. In the present embodiment, the key portion between the key groove 210A and the key 212 is used. Many lubricants can be continuously filled.

  That is, in the present embodiment, the O-ring 220 is used for sealing the lubricant by devising the configuration. Therefore, the O-ring 220 is detached even when pressure is applied to the lubricant or the pressure fluctuates. Without retaining the lubricant. At the same time, since the lubricant can be held in a state where pressure is applied to the lubricant, the lubricant can be continuously distributed over a longer period in a place where fretting is likely to occur.

  Therefore, it is possible to prevent the fretting and to further extend the service life of the apparatus adopting the connection structure of the motor shaft 210 and the hollow shaft 224.

  In FIG. 2, in the present embodiment, the amount of wear gradually increases until the operation cycle exceeds 400,000 times, and after that, the level is almost flat after that, initially, the motor shaft 210 and the hollow shaft 224 This is probably because the part that was strongly touched was eliminated after 400,000 times and came to contact each other as a whole.

  Next, a connection structure between the motor shaft and the hollow shaft of the rotation transmission device according to the third embodiment will be described with reference to FIG.

  In the present embodiment, unlike the second embodiment, a form in which the position of the through hole 338A is provided in the bearing housing 338 is shown. This embodiment is a variation of the second embodiment because the position of the through hole 338A is preferably changed in view of the difference in motor capacity. Since the location of the through hole 338A is different, the position and direction of the opening 318B in which the stopper lid 322 is closed (attached) is slightly different from the second embodiment. Other than that, the last two digits of the reference numerals of the second embodiment are functionally the same as the same constituent elements, and thus the description thereof is omitted.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the above embodiment. That is, it goes without saying that improvements and design changes can be made without departing from the scope of the present invention.

  For example, in the above embodiment, the motor output shaft is the motor shaft 110, 210, 310, and the hollow type input shaft of the speed reduction mechanism is the hollow shaft 124, 224, 324. However, the solid shaft and the shaft are inserted. As long as it has a relationship with the hollow shaft, it can be applied to any case where rotation is transmitted or even a simple joint structure.

  In the above embodiment, grease is used as the lubricant, but it may be lubricating oil or other lubricants.

  Further, in the above embodiment, the power transmission means is specifically constituted by a key and a key groove, but the present invention is not limited to this. For example, the present invention includes a so-called D-cut coupling structure, a structure using spline coupling, and the like that has an uneven structure formed in the radial direction of a shaft that transmits power for wide power transmission and that can be visually confirmed. Can be applied.

  In the above embodiment, the lubricant is discharged from the opening. However, the present invention is not limited to this, and the lubricant is reduced by connecting a pipe for supplying the lubricant to the opening. By supplying the lubricant, it is possible to fill and replenish the gap with the lubricant through the flow path.

The schematic sectional drawing of the part which shows the connection structure of the motor shaft and hollow shaft of the rotation transmission apparatus which concerns on 1st Embodiment of this invention. Similarly, a graph showing the experimental results of the amount of wear against the number of operating cycles The schematic sectional drawing of the part which shows the connection structure of the motor shaft and hollow shaft of the rotation transmission apparatus which concerns on 2nd Embodiment of this invention. The schematic sectional drawing of the part which shows the connection structure of the motor shaft and hollow shaft of the rotation transmission apparatus which concerns on 3rd Embodiment of this invention. Schematic of a portion showing a conventional connecting structure between a shaft hole member and a shaft

Explanation of symbols

2 ... Bush 10, 110, 210, 310 ... Motor shaft 10A, 110A, 210A, 310A ... Key groove 12, 112, 212, 312 ... Key 24, 124, 224, 324 ... Hollow shaft 100, 200, 300 ... Transmission of rotation Device 116, 126, 226, 326 ... Oil seal 118, 218, 318 ... Holding cover 118B, 218B, 318B ... Opening 118C, 218C, 318C ... Flow path 118D, 218D, 318D ... Air gap 122, 222, 322 ... Stop lid 128 , 132, 228, 232, 328, 332 ... bearings 130, 230, 330 ... auxiliary members 134, 234, 334 ... bevel shafts 136, 236, 336 ... housings 138, 238, 338 ... bearing housings 140, 240, 340 ... mounting Flange 140 , 240A, 338A ... through-holes 142, 242, 342 ... motor flanges 144, 146, 148, 150, 244, 246, 248, 250, 344, 346, 348, 350 ... bolts, nuts 218A2, 318A2 ... engaging portions 218AA , 230A ... inner peripheral surface 218E, 318E ... O-ring groove 220, 320 ... O-ring 224A ... outer peripheral surface 352 ... discharge pipe

Claims (6)

A motor shaft;
A hollow shaft fitted in the axial direction of the motor shaft and connected to the motor shaft by power transmission means so as to be able to transmit power;
A holding cover that engages the motor shaft and the hollow shaft,
The motor shaft, the hollow shaft, and the holding cover form a lubricant holding space for holding the lubricant between the motor shaft and the hollow shaft. Connected structure. In claim 1,
A structure for connecting a motor shaft and a hollow shaft, wherein the lubricant is held in a pressurized state. In claim 1 or 2,
The holding cover is fixed to one of the motor shaft and the hollow shaft, and is fitted to the other via an O-ring. Connection structure of a motor shaft and a hollow shaft. In claim 1 or 2,
The holding cover is fitted to the motor shaft and the hollow shaft through an oil seal. The connection structure of the motor shaft and the hollow shaft. In any one of Claims 1 thru | or 4,
The holding cover is provided with an opening for discharging the lubricant and a stopper lid for closing the opening. A connection structure between a motor shaft and a hollow shaft. In a method of connecting a motor shaft and a hollow shaft, the motor shaft including a motor shaft, the motor shaft being fitted in the axial direction, and a hollow shaft connected to the motor shaft so as to be able to transmit power by power transmission means other than friction.
Placing a lubricant inside the hollow shaft;
Inserting the motor shaft inside the hollow shaft;
Discharging the lubricant from an opening of a lubricant holding space formed by the hollow shaft, the motor shaft, and a holding cover engaged with the motor shaft and the hollow shaft;
Sealing the opening;
A method for connecting a motor shaft and a hollow shaft.

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