WO2023188525A1 - 接続装置 - Google Patents

接続装置 Download PDF

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Publication number
WO2023188525A1
WO2023188525A1 PCT/JP2022/042731 JP2022042731W WO2023188525A1 WO 2023188525 A1 WO2023188525 A1 WO 2023188525A1 JP 2022042731 W JP2022042731 W JP 2022042731W WO 2023188525 A1 WO2023188525 A1 WO 2023188525A1
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WO
WIPO (PCT)
Prior art keywords
conductive
rotating shaft
recess
conductive part
contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/042731
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
敬登 山岸
智 甲藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NSK Ltd
Original Assignee
NSK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NSK Ltd filed Critical NSK Ltd
Publication of WO2023188525A1 publication Critical patent/WO2023188525A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H02K5/225—Terminal boxes or connection arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
    • F16C17/08—Sliding-contact bearings for exclusively rotary movement for axial load only for supporting the end face of a shaft or other member, e.g. footstep bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/30—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for axial load mainly
    • F16C19/32—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for axial load mainly for supporting the end face of a shaft or other member, e.g. footstep bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N31/00—Means for collecting, retaining, or draining-off lubricant in or on machines or apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N39/00—Arrangements for conditioning of lubricants in the lubricating system
    • F16N39/06—Arrangements for conditioning of lubricants in the lubricating system by filtration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
    • F16N7/30—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated the oil being fed or carried along by another fluid
    • F16N7/32—Mist lubrication
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/08—Slip-rings
    • H01R39/12—Slip-rings using bearing or shaft surface as contact surface
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/40—Structural association with grounding devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F3/00—Carrying-off electrostatic charges
    • H05F3/02—Carrying-off electrostatic charges by means of earthing connections
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2205/00—Specific aspects not provided for in the other groups of this subclass relating to casings, enclosures, supports
    • H02K2205/09—Machines characterised by drain passages or by venting, breathing or pressure compensating means

Definitions

  • connection device that electrically connects a conductor and a hollow rotating shaft rotatably supported by a bearing.
  • Patent Document 1 discloses that a static eliminating member is brought into contact with the end of the rotating shaft, and the electric charge charged on the rotating shaft is caused to flow through the static neutralizing member to the ground wire. Are listed.
  • a hollow rotating shaft is sometimes used in order to use the inside of the shaft as an oil passage for lubricating oil.
  • the rotating shaft is hollow, it is difficult to bring the neutralizing member into contact with the end of the rotating shaft.
  • connection device that can electrically connect a rotating shaft and a conductor while allowing the inside of a hollow rotating shaft to function as an oil passage.
  • connection device that electrically connects a hollow rotating shaft rotatably supported by a bearing and an electric conductor, the connection device having a recess, and an opening of the recess facing outward.
  • a first conductive part is attached to the end of the rotating shaft and has conductivity, one end is inserted into the recess and abuts the bottom of the recess, and the other end is attached to the conductor.
  • a second conductive part that electrically connects the first conductive part and the conductor, the first conductive part is provided on the outer peripheral surface of the first conductive part, and the first conductive part is provided on the outer circumference of the end of the rotating shaft.
  • the recess in the first conductive part has a fitting part that is fitted into and fixed to the surface, and a first contact part that is provided at the bottom of the recess in the first conductive part and comes into contact with the second conductive part.
  • An oil passage hole passing through the bottom of the recess is formed around the first contact part at the bottom of the recess, and the second conductive part is provided at one end of the second conductive part, and the second conductive part is provided at one end of the second conductive part.
  • at least one of the first contact part and the second contact part has a convex shape, and the first contact part and the second contact part are rotated. They abut each other on the axis of rotation of the shafts.
  • connection device has a first conductive portion that is fitted into and fixed to the inner circumferential surface of the end of the rotating shaft. Therefore, in the connection device, even if the rotating shaft is hollow, the first contact portion and the second contact portion are brought into contact with each other on the rotational axis of the rotating shaft, and the rotating shaft and the conductor are electrically connected. Can be connected. Note that at least one of the first contact portion and the second contact portion has a convex shape. Therefore, the first contact portion and the second contact portion make point contact with each other on the rotation axis of the rotation shaft. That is, at the contact portion between the first contact portion and the second contact portion, the difference in circumferential speed between the two becomes zero.
  • the connecting device can suppress the lubricating oil from entering between the first contact part and the second contact part, and maintain the electrical connection between the first conductive part and the second conductive part. I can do it. Further, an oil passage hole is provided at the bottom of the recessed portion of the first conductive portion. Therefore, even if the first conductive part is attached to the end of the rotating shaft, the oil passage inside the rotating shaft will not be blocked by the first conductive part. In this way, the connection device can electrically connect the rotating shaft and the conductor while allowing the inside of the hollow rotating shaft to function as an oil passage.
  • the first conductive part has a main body having a recess, a fitting part on the outer peripheral surface, and is electrically conductive, and a first contact part attached to the bottom of the recess of the main body. and a conductive steel ball.
  • the first conductive part and the second conductive part can be easily brought into point contact by using a steel ball.
  • the first conductive part may further include a filter that covers the oil passage hole.
  • the connection device can prevent foreign matter contained in the lubricating oil flowing inside the rotating shaft.
  • the opening area of one end of the oil passage hole and the opening area of the other end are different from each other, and one end of the oil passage hole and the other end are different from each other.
  • the positions may be different from each other in the direction of rotation.
  • the oil passage hole is inclined with respect to the rotation axis of the rotating shaft and has a different opening area, so that when the first conductive part rotates together with the rotating shaft, the oil passage hole is connected between both ends of the oil passage hole.
  • a pressure difference occurs in the lubricating oil in the oil passage hole.
  • the connecting device can force-feed the lubricating oil from the end with the smaller opening area toward the end with the larger opening area. In this way, the connecting device can pump lubricating oil during rotation of the rotating shaft.
  • the rotating shaft and the conductor can be electrically connected while the inside of the hollow rotating shaft functions as an oil passage.
  • FIG. 1 is a sectional view around a rotating shaft to which a connecting device is attached.
  • FIG. 2 is an exploded perspective view of the connection device of FIG. 1.
  • FIG. 3 is a sectional view showing the internal structure of the connecting device according to the first modification.
  • FIG. 4 is an exploded perspective view of the connection device of FIG. 3.
  • FIG. 5 is a sectional view showing the internal structure of a connecting device according to a second modification.
  • FIG. 6 is an exploded perspective view of the connection device of FIG. 5.
  • FIG. 7 is a sectional view showing the internal structure of a connecting device according to a third modification.
  • FIG. 8 is an exploded perspective view of the connection device of FIG. 7.
  • FIG. 9 is a partial cross-sectional view showing a part of the ball holder of the connection device of FIG. 7.
  • FIG. 10 is a partial sectional view showing a part of the ball holder of the connection device of FIG. 7.
  • connection device 1 electrically connects a rotating shaft 2 rotatably supported by a bearing 3 and a casing (conductor) 4.
  • the rotating shaft 2 may be the shaft of an electric motor, or may be a shaft connected to the shaft of the electric motor via a gear.
  • a shaft oil passage 2c is formed inside the rotary shaft 2 and extends along a rotation axis L that is the center of rotation of the rotary shaft 2.
  • the rotating shaft 2 is a hollow rotating shaft (hollow structure). Lubricating oil flows through the shaft oil passage 2c of the rotating shaft 2.
  • the bearing 3 supports the rotating shaft 2 rotatably about the rotation axis L.
  • the type of the bearing 3 is not particularly limited as long as it can rotatably support the rotating shaft 2.
  • the housing 4 accommodates the rotating shaft 2, the bearing 3, etc.
  • the housing 4 has conductivity.
  • the connection device 1 electrically connects the rotating shaft 2 and the housing 4. Thereby, the connection device 1 forms a conductive path having a lower resistance value than the conductive path from the rotating shaft 2 to the housing 4 via the bearing 3.
  • the connection device 1 includes a first conductive part 10 and a second conductive part 20.
  • the first conductive part 10 has conductivity.
  • the first conductive part 10 has a shape having a recessed part 10a.
  • the first conductive part 10 is attached to the end 2a of the rotating shaft 2 so that the opening of the recess 10a faces outward.
  • the first conductive part 10 includes a ball holder (body part) 11 and a steel ball (first contact part) 12.
  • the ball holder 11 and the steel balls 12 each have electrical conductivity.
  • the ball holder 11 has a shape having a recess 10a.
  • the ball holder 11 is formed by pressing a steel plate, for example.
  • the steel balls 12 may be, for example, balls used in bearings.
  • the steel ball 12 is attached to the bottom 10b of the recess 10a of the ball holder 11.
  • the steel ball 12 is fitted into a hole provided in the bottom 10b of the recess 10a of the ball holder 11, and fixed by caulking.
  • the steel ball 12 is provided at the bottom 10b of the recess 10a in the first conductive part 10, and constitutes a convex contact part that comes into contact with the second conductive part 20 (end surface 22a of the brush 22).
  • the steel ball 12 is attached to the ball holder 11 so that the center of the steel ball 12 is located on the rotation axis L, which is the rotation center of the rotation shaft 2.
  • a fitting portion 11a is provided on the outer circumferential surface of the ball holder 11 and is fitted into and fixed to the inner circumferential surface 2b of the end portion 2a of the rotating shaft 2. That is, the ball holder 11 is fitted into and fixed to the inner circumferential surface 2b of the rotating shaft 2 that forms the shaft oil passage 2c. The ball holder 11 is fitted and fixed onto the inner peripheral surface 2b of the end 2a of the rotating shaft 2 so that the opening of the recess 10a faces outward. The fitting portion 11a of the ball holder 11 and the inner peripheral surface 2b of the rotating shaft 2 are engaged with each other. Therefore, the ball holder 11 rotates integrally with the rotating shaft 2. The steel ball 12 contacts one end of the second conductive portion 20 (the end surface 22a of the brush 22) within the recess 10a of the ball holder 11.
  • an oil passage hole 11b is provided around the steel ball 12, passing through the bottom 10b of the recess 10a.
  • the lubricating oil flowing through the shaft oil passage 2c of the rotating shaft 2 can flow through the oil passage hole 11b.
  • the shape and number of oil passage holes 11b are not particularly limited.
  • the second conductive part 20 is inserted into the recess 10a of the first conductive part 10, and is brought into contact with the steel ball 12 provided at the bottom 10b of the recess 10a. Further, the other end of the second conductive part 20 is attached to the casing 4 and electrically connects the first conductive part 10 and the casing 4. More specifically, the second conductive section 20 includes a brush holder 21, a brush 22, a spring 23, and a conductive terminal 24.
  • the brush holder 21 is inserted into the recess 10a of the first conductive part 10.
  • the other end of the brush holder 21 is held by the housing 4.
  • the housing 4 has a hole 4 a on the rotation axis L that is the center of rotation of the rotation shaft 2 .
  • the brush holder 21 is held in the housing 4 by inserting the other end into the hole 4a.
  • an O-ring 25 is attached to the outer peripheral surface 21b of the brush holder 21.
  • the O-ring 25 closes the space between the inner circumferential surface of the hole 4a of the housing 4 and the outer circumferential surface 21b of the brush holder 21.
  • the brush holder 21 is made of resin, for example.
  • the brush holder 21 has a holder hole 21a extending along the rotation axis L.
  • the brush 22 is inserted into the holder hole 21a of the brush holder 21.
  • the brush 22 can slide along the rotation axis L within the holder hole 21a in a state where the spring 23 is not provided.
  • the brush 22 is electrically conductive.
  • a carbon brush can be used, for example.
  • the end of the recess 10a of the first conductive part 10 on the bottom 10b side (steel ball 12 side) protrudes from the holder hole 21a of the brush holder 21 by a predetermined length.
  • an end surface (second contact portion) 22a on the bottom 10b side (steel ball 12 side) of the recess 10a of the first conductive portion 10 contacts the steel ball 12. That is, the end surface 22a of the brush 22 is provided at one end (the end on the steel ball 12 side) of the second conductive part 20 and forms a contact part that comes into contact with the steel ball 12 of the first conductive part 10. .
  • the shape of the end surface 22a may be flat, concave (for example, an arcuate shape), or convex (for example, an arcuate shape). . In this embodiment, it is sufficient that the end surface 22a can make point contact with the steel ball 12.
  • the steel ball 12 is provided such that the center of the steel ball 12 is located on the rotation axis L. Therefore, the end surface 22a of the brush 22 and the steel ball 12 are in point contact with each other on the rotation axis L. Thereby, even if the first conductive part 10 rotates together with the rotating shaft 2, the contact point between the end surface 22a of the brush 22 and the steel ball 12 does not shift. That is, at the connection portion between the end surface 22a and the steel ball 12, the difference in peripheral speed between the two becomes zero.
  • the conductive terminal 24 is attached to the other end of the brush holder 21 (the end opposite to the side inserted into the recess 10a).
  • the conductive terminal 24 is provided on the outside of the housing 4.
  • the conductive terminal 24 has electrical conductivity.
  • One end of the conductive terminal 24 is embedded and fixed in the other end of the brush holder 21.
  • One end of the conductive terminal 24 faces the brush 22 in the rotation axis L direction.
  • the other end of the conductive terminal 24 projects outward from the brush holder 21.
  • the other end of the conductive terminal 24 is fixed to the outer surface of the housing 4 by a bolt 26.
  • the spring 23 is arranged between the brush 22 and the conductive terminal 24 in the holder hole 21a of the brush holder 21.
  • the spring 23 has electrical conductivity.
  • Spring 23 is a compression spring. The spring 23 biases the brush 22 in a direction in which the brush 22 approaches the steel ball 12. Thereby, the brush 22 comes into point contact with the steel ball 12 in the state where the connecting device 1 is attached. That is, the brush 22 and the steel ball 12 are electrically connected.
  • the ball holder 11, the steel ball 12, the brush 22, the spring 23, and the conductive terminal 24 are electrically conductive. Therefore, the rotating shaft 2 is electrically connected to the housing 4 via the ball holder 11, the steel ball 12, the brush 22, the spring 23, and the conductive terminal 24. That is, the ball holder 11, the steel ball 12, the brush 22, the spring 23, and the conductive terminal 24 serve as a conductive path that electrically connects the rotating shaft 2 and the housing 4. Thereby, even if the rotating shaft 2 is in a rotating state, the rotating shaft 2 and the housing 4 are electrically connected.
  • this connecting device 1 includes the first conductive portion 10 that is fitted into and fixed to the inner circumferential surface 2b of the end portion 2a of the rotating shaft 2. Therefore, in the connecting device 1, even if the rotating shaft 2 is hollow, the steel ball 12 of the first conductive part 10 and the brush 22 of the second conductive part 20 are brought into contact with each other on the rotation axis L of the rotating shaft 2. , the rotating shaft 2 and the housing 4 can be electrically connected.
  • the connecting device 1 can suppress the lubricating oil from entering between the steel ball 12 and the end surface 22a of the brush 22, and maintain the electrical connection between the first conductive part 10 and the second conductive part 20. be able to.
  • an oil passage hole 11b is provided at the bottom 10b of the recess 10a of the first conductive part 10. Therefore, even if the first conductive part 10 is attached to the end 2a of the rotary shaft 2, the shaft oil passage 2c inside the rotary shaft 2 will not be blocked by the first conductive part 10. In this way, the connecting device 1 can electrically connect the rotating shaft 2 and the housing 4 while allowing the shaft oil passage 2c inside the hollow rotating shaft 2 to function as an oil passage.
  • the first conductive part 10 includes a steel ball 12 that comes into contact with the brush 22 of the second conductive part 20. Thereby, in the connection device 1, by using the steel ball 12, the first conductive part 10 and the second conductive part 20 can be easily brought into point contact.
  • connection device 1A includes a first conductive part 10A instead of the first conductive part 10 in the embodiment.
  • the first conductive part 10A includes a ball holder 11, a steel ball 12, and a filter 13.
  • the filter 13 covers the oil passage hole 11b provided in the ball holder 11. Note that the filter 13 may be provided within the oil passage hole 11b, or may be provided on the end surface of the ball holder 11 so as to cover the oil passage hole 11b.
  • the filter 13 includes fine holes or channels through which lubricating oil flowing through the shaft oil passage 2c of the rotating shaft 2 can flow. Furthermore, the filter 13 has a function of capturing foreign substances other than the lubricating oil to be distributed.
  • the type of filter 13 is not particularly limited.
  • the connecting device 1A according to this modification can suppress the lubricating oil from entering between the steel ball 12 and the end surface 22a of the brush 22, and the first conductive portion 10A Electrical connection with the second conductive part 20 can be maintained. Furthermore, since the connecting device 1A includes the filter 13, it is possible to capture foreign matter contained in the lubricating oil flowing through the shaft oil path 2c of the rotating shaft 2 and prevent the foreign matter from flowing.
  • connection device 1B includes a first conductive part 10B instead of the first conductive part 10 in the embodiment.
  • the first conductive part 10B includes a main body part 11B.
  • the main body portion 11B has a shape having a recess 10a, similar to the ball holder 11 in the embodiment.
  • a convex portion (first contact portion) 11c that comes into contact with the brush 22 (end surface 22a) of the second conductive portion 20 is provided at the bottom portion 10b of the recessed portion 10a in the main body portion 11B.
  • the convex portion 11c has a convex shape that protrudes toward the end surface 22a of the brush 22.
  • the convex portion 11c is provided on the main body portion 11B such that the apex of the convex portion 11c is located on the rotation axis L, which is the center of rotation of the rotation shaft 2. That is, the convex portion 11c and the end surface 22a of the brush 22 are in point contact with each other in the shape of the rotation axis L.
  • an oil passage hole 11b is provided around the protrusion 11c.
  • the main body portion 11B is integrally formed with the oil passage hole 11b and the convex portion 11c by pressing a steel plate.
  • the connecting device 1B including the convex portion 11c according to the present modification prevents lubricating oil from entering between the convex portion 11c and the end surface 22a of the brush 22, similarly to the connecting device 1 according to the embodiment.
  • the electrical connection between the first conductive part 10B and the second conductive part 20 can be maintained.
  • connection device 1C includes a first conductive portion 10C instead of the first conductive portion 10 in the embodiment.
  • the first conductive part 10C includes a ball holder (main body part) 11C and a steel ball 12.
  • the ball holder 11C has a shape having a recess 10a, similar to the ball holder 11 in the embodiment.
  • the steel ball 12 is attached to the ball holder 11C so that the center of the steel ball 12 is located on the rotation axis L, which is the rotation center of the rotation shaft 2.
  • a plurality of oil passage holes 11d are formed around the steel ball 12 at the bottom 10b of the recess 10a in the ball holder 11C, which penetrate the bottom 10b of the recess 10a.
  • the oil passage hole 11d is provided in the bottom portion 10b of the ball holder 11C so as to be inclined with respect to the rotation axis L.
  • FIG. 9 shows a cross section of the ball holder 11C taken along the rotation axis L at a position deviated from the rotation axis L.
  • FIG. 10 shows a cross section of the ball holder 11C taken along the extending direction of the oil passage hole 11d located at the upper part in the figure among the plurality of oil passage holes 11d.
  • the inclination of the oil passage hole 11d with respect to the rotation axis L will be explained in more detail.
  • One end and the other end of the oil passage hole 11d are at different positions in the rotational direction of the rotating shaft 2.
  • the end position here may be the center position of the end opening of the oil passage hole 11d.
  • one end and the other end of the oil passage hole 11d are located at different positions in the direction orthogonal to the rotation axis L. In other words, one of the two ends of the oil passage hole 11d is located closer to the rotation axis L, and the other end is located farther from the rotation axis L than the other end.
  • the end position here may be the center position of the end opening of the oil passage hole 11d. In this way, the plurality of oil passage holes 11d are inclined spirally (spirally) around the rotation axis L with respect to the rotation axis L.
  • the opening area of one end of the oil passage hole 11d and the opening area of the other end of the oil passage hole are different from each other.
  • the opening area of the end on the inner surface side of the ball holder 11C among both ends of the oil passage hole 11d is smaller than the opening area of the end on the outer surface side of the ball holder 11C (see FIG. 10).
  • the oil passage hole 11d is inclined with respect to the rotation axis L, and the opening areas of both ends of the oil passage hole 11d are different from each other.
  • a pressure difference occurs in the lubricating oil in the oil passage hole 11d between both ends of the oil passage hole 11d. That is, by using the first conductive part 10C having the oil passage hole 11d, the connecting device 1C allows lubricating oil to flow from the end where the opening area of the oil passage hole 11d is small to the end where the opening area is large. can be pumped.
  • the connecting device 1C according to the present modification can suppress the lubricating oil from entering between the steel ball 12 and the end surface 22a of the brush 22, similarly to the connecting device 1 according to the embodiment, and the first Electrical connection between the conductive part 10C and the second conductive part 20 can be maintained. Furthermore, since the connecting device 1C includes a ball holder 11C having oil passage holes 11d that are inclined with respect to the rotational axis L and have different opening areas at both ends, lubricating oil is pumped when the rotational shaft 2 rotates. can do.
  • the steel balls 12 are provided in the first conductive parts 10, 10A, 10C, but the steel balls are attached to the tips of the brushes 22, and the steel balls are attached to the bottoms of the recesses 10a of the first conductive parts 10, 10A to 10C. 10b.
  • the rotating shaft 2 may be electrically connected to a conductor other than the casing 4.
  • the brush holder 21 may have electrical conductivity. In this case, the brush holder 21 may function as part of the electrically conductive path between the rotating shaft 2 and the housing 4.
  • connection device 1 a contact portion between the brush 22 and the steel balls 12 is surrounded between the end surface of the brush holder 21 on the steel ball 12 side and the bottom portion 10b of the recess 10a in the ball holder 11.
  • a seal may be provided. In this case, it is possible to further suppress lubricating oil from entering between the brush 22 and the steel balls 12. This seal may also be applied to the connection devices 1A to 1C according to each modification.
  • the ball holder 11 is fixed to the rotating shaft 2 by fitting the fitting portion 11a of the ball holder 11 into the inner circumferential surface 2b of the rotating shaft 2.
  • the fixing method is not limited to this, and for example, a flange portion 11f (see FIG. 1) extending outward from the opening edge of the recess 10a of the ball holder 11 may be fixed to the end portion 2a of the rotating shaft 2 with bolts or the like. Good too.
  • the outer circumferential surface of the ball holder 11 (the part of the fitting portion 11a) does not need to be in contact with the inner circumferential surface 2b of the rotating shaft 2.
  • a method similar to this fixing method may be adopted for the ball holders 11, 11C and the main body portion 11B according to the modification.
  • 1, 1A to 1C... Connection device 2... Rotating shaft, 3... Bearing, 4... Housing (conductor), 10, 10A to 10C... First conductive part, 10a... Recessed part, 10b... Bottom, 11, 11C... Ball holder (main body part), 11B...main body part, 11a...fitting part, 11b, 11d...oil passage hole, 11c...convex part (first contact part), 12...steel ball (first contact part), 13... Filter, 20... Second conductive part, 22a... End surface (second contact part).

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Rolling Contact Bearings (AREA)
  • Motor Or Generator Frames (AREA)
PCT/JP2022/042731 2022-03-29 2022-11-17 接続装置 Ceased WO2023188525A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-053991 2022-03-29
JP2022053991 2022-03-29

Publications (1)

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WO2023188525A1 true WO2023188525A1 (ja) 2023-10-05

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PCT/JP2022/042731 Ceased WO2023188525A1 (ja) 2022-03-29 2022-11-17 接続装置
PCT/JP2023/012840 Ceased WO2023190698A1 (ja) 2022-03-29 2023-03-29 接続装置

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US (1) US20250219339A1 (https=)
JP (1) JP7816496B2 (https=)
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WO (2) WO2023188525A1 (https=)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025141978A1 (ja) * 2023-12-27 2025-07-03 日本精工株式会社 ブラシユニット、及び接続装置
WO2025243401A1 (ja) * 2024-05-21 2025-11-27 三菱電機株式会社 モータ、送風機および空気調和装置

Citations (5)

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Publication number Priority date Publication date Assignee Title
US20100127585A1 (en) * 2008-11-24 2010-05-27 Caterpillar Inc. Grounding mechanism for electric motor
JP2016171642A (ja) * 2015-03-12 2016-09-23 Ntn株式会社 モータ駆動装置
JP2020031492A (ja) * 2018-08-22 2020-02-27 株式会社Ｓｕｂａｒｕ 回転駆動装置
JP2022129781A (ja) * 2021-02-25 2022-09-06 日本電産株式会社 モータ
JP2022154481A (ja) * 2021-03-30 2022-10-13 日本電産株式会社 モータユニット

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Publication number Priority date Publication date Assignee Title
JPH0646221Y2 (ja) * 1987-08-28 1994-11-24 日本電産株式会社 ブラシレスモ−タ
JP2001258198A (ja) * 2000-03-10 2001-09-21 Sanyo Electric Co Ltd 誘導電動機
JP4381664B2 (ja) * 2002-08-23 2009-12-09 Ｎｔｎ株式会社 通電軸受

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100127585A1 (en) * 2008-11-24 2010-05-27 Caterpillar Inc. Grounding mechanism for electric motor
JP2016171642A (ja) * 2015-03-12 2016-09-23 Ntn株式会社 モータ駆動装置
JP2020031492A (ja) * 2018-08-22 2020-02-27 株式会社Ｓｕｂａｒｕ 回転駆動装置
JP2022129781A (ja) * 2021-02-25 2022-09-06 日本電産株式会社 モータ
JP2022154481A (ja) * 2021-03-30 2022-10-13 日本電産株式会社 モータユニット

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025141978A1 (ja) * 2023-12-27 2025-07-03 日本精工株式会社 ブラシユニット、及び接続装置
WO2025243401A1 (ja) * 2024-05-21 2025-11-27 三菱電機株式会社 モータ、送風機および空気調和装置

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WO2023190698A1 (ja) 2023-10-05
JP7816496B2 (ja) 2026-02-18
CN118947223A (zh) 2024-11-12
JPWO2023190698A1 (https=) 2023-10-05
US20250219339A1 (en) 2025-07-03

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