JP5668415B2 - Rotating current collector and rolling bearing retainer state detection device having the same - Google Patents

Description

  The present invention relates to a rotary current collector and a state detector for a rolling bearing cage equipped with the same.

  Generally, a rolling bearing includes an inner ring, an outer ring that is coaxially disposed radially outward of the inner ring, a plurality of rolling elements that are arranged to roll between the inner ring and the outer ring, and a plurality of rolling elements. And a cage for holding the circumferential interval. And a some rolling element revolves in the circumferential direction with the relative rotation of an inner ring | wheel and an outer ring | wheel, and a holder | retainer also rotates in the circumferential direction by revolution of this rolling element.

Stress is generated in the cage due to contact with the rolling elements. It is very important to grasp the state of occurrence of this stress in evaluating the operating state of the rolling bearing. For this reason, conventionally, a strain generated in the cage is detected by a strain gauge, and a stress generated in the cage is obtained from the detected strain (for example, see Patent Document 1).
In the technique of Patent Document 1, a strain gauge is attached to a cage, and a detection signal of the strain gauge is amplified and transmitted to a strain gauge. And the slip ring is provided in the middle of the electrical wiring which connects the strain gauge rotated with a holder | retainer, and the strain gauge of a stationary state.

  The slip ring includes a rotating body having an input terminal and a stationary body having an output terminal, and the input terminal and the output terminal are electrically connected inside the slip ring. Then, the strain sensor and the input terminal of the rotating body are connected by electrical wiring, the output terminal of the stationary body and the strain gauge are connected by electrical wiring, and the rotating body is rotationally driven in synchronization with the rotation of the cage. Thereby, even if a strain gauge rotates with a holder | retainer, the detection signal of a strain gauge can be appropriately transmitted to a strain gauge, without an electric wiring breaking.

JP-A-10-239186

  However, since the allowable (relative) rotational speed between the rotating body and the stationary body is determined for the slip ring, the cage distortion cannot be detected in a high-speed rotational range exceeding this allowable rotational speed. There is a drawback. Further, when the slip ring is regularly used at a high rotational speed close to the allowable rotational speed, there is a disadvantage that the life is reached early.

  The present invention has been made in view of the above-described problems, and provides a rotary current collector that can cope with high-speed rotation of a cage, and a rolling bearing cage equipped with the same. With the goal.

A rotary current collector according to a first aspect of the present invention is:
Rotation comprising a first part having a first terminal and a second part having a second terminal electrically connected to the first terminal and rotatable relative to the first part Type current collector,
Between the first component and the second component, a plurality of intermediate components arranged in series coaxially with the first and second components,
The first part and the intermediate part adjacent to the first part, the intermediate part and the second part adjacent to the intermediate part, and the intermediate parts adjacent to each other are connected so as to be relatively rotatable, respectively.
Further, a plurality of driving means for rotating and driving the first part and the intermediate part, respectively, and the rotational speed of the first part and the intermediate part in a direction from the first part side to the second part side. And a control unit that controls each of the driving means so as to decrease sequentially.

  In the rotary current collector having the above-described configuration, when the first component is rotated at a high rotation speed and the second component is in a stationary state, the rotation speed of the first component and the intermediate component is set to the second speed from the first component side. The relative rotational speed between the first part and the adjacent intermediate part, the relative rotational speed between the second part and the adjacent intermediate part, and the adjacent intermediate parts by sequentially decreasing in the direction toward the part. The relative rotational speed of each can be reduced. Therefore, it is possible to cope with a high rotation speed as a whole of the rotary current collector, and it is also possible to prevent the life from being reached early by suppressing the relative rotation speed between the components.

The rotary current collector according to the second aspect of the present invention is:
A first part having a first terminal; and a second part having a second terminal electrically connected to the first terminal and coupled to the first part so as to be relatively rotatable. A plurality of current collecting members,
A plurality of current collecting members are coaxially arranged in series so that the first parts and the second parts are alternately arranged, and the second parts of one current collecting member adjacent to each other and the other parts The first component of the current collecting member is coupled so as to be integrally rotatable to form a coupled component, and the second terminal of the second component and the first terminal of the first component in the coupled component are electrically conductive Connected by members,
Furthermore, a plurality of drive means for rotating and driving the first component and the coupling component located at one end in the series direction of a plurality of current collecting members, and the rotational speeds of the first component and the coupling component are determined in the series direction. And a controller that controls each of the driving means so as to sequentially decrease in a direction from the first component at one end toward the second component at the other end in the series direction.

  The rotary current collector of the present invention rotates the first component arranged at one end in the series direction at a high rotation speed, and the second component arranged at the other end in the series direction is in a stationary state. By sequentially reducing the rotational speed of one component and the coupling component of the first and second components adjacent to each other in the direction from the first component side of the one end toward the second component side of the other end, Decrease the relative rotational speed of one part and a connecting part adjacent thereto, the relative rotational speed of the second part at the other end and the connecting part adjacent thereto, and the relative rotational speed of adjacent connecting parts. be able to. Therefore, it is possible to cope with a high rotation speed as a whole of the rotary current collector, and it is also possible to prevent the life from being reached early by suppressing the relative rotation speed between the components. In addition, a current collecting member having a first part and a second part, for example, a rotary type current collecting apparatus can be configured by combining a plurality of general slip rings. Thus, the rotary current collector can be manufactured at low cost.

A state detecting device for a rolling bearing cage according to a third aspect of the present invention,
A rotating device for rotating a rolling bearing having a cage;
The above rotary current collector;
A state detection sensor that detects the state of the cage and is connected to the first terminal of the first component disposed at one end in the series direction of the rotary current collector by electrical wiring;
A receiving unit that is connected to a second terminal of the second component disposed at the other end in the series direction of the rotary current collector by an electrical wiring and that receives a detection signal of the state detection sensor; It is characterized by.

  According to this configuration, the rotary current collector can cope with a higher rotational speed of the cage, and the relative rotational speed between the parts constituting the rotary current collector is suppressed to shorten the life. It is also possible to prevent reaching this.

  According to the present invention, the rotary current collector can cope with a higher rotational speed, and the relative rotational speed between the parts constituting the rotary current collector is suppressed to prevent the life from reaching early. can do.

It is the schematic which shows the state detection apparatus of the cage for rolling bearings which concerns on embodiment of this invention. It is a schematic sectional drawing which shows a rotary type current collector in detail.

  Hereinafter, embodiments of a state detection device for a rolling bearing cage according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a state detection device for a rolling bearing cage according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing in detail the rotary current collector in FIG.

  In the state detection device 10 of the present embodiment, as the rolling bearing 18, an inner ring 19, an outer ring 20 disposed radially outward of the inner ring 19, and an inner ring 19 and the outer ring 20 are disposed so as to be able to roll. In addition, a ball bearing provided with a plurality of balls (rolling elements) 21 and a retainer 22 that holds a circumferential interval between the plurality of balls 21 is used.

And the state detection apparatus 10 of this embodiment detects distortion as a state of the holder | retainer 22. FIG. Therefore, the state detection device 10 includes a strain detection sensor 13 such as a strain gauge that detects strain of the cage 22, and a strain meter (reception unit) 14 that receives a detection signal of the strain detection sensor 13. Then, the strain amount generated in the cage 22 can be acquired by the strain gauge 14, and the stress generated in the cage 22 can be obtained from the strain amount.
Further, the state detection device 10 includes a rotation device 15 that rotates the rolling bearing 18 and a rotation speed detector 16 that detects the rotation speed (number of rotations) of the cage 22.

  The rotating device 15 includes a housing 24 in which the outer ring 20 of the rolling bearing 18 is mounted, a rotating shaft 25 into which the inner ring 19 is fitted, and first driving means 26 that rotationally drives the rotating shaft 25. The first drive means 26 includes a drive body M1 such as a servomotor, and a first transmission mechanism 27 that transmits the rotational power of the drive body M1 to the rotary shaft 25. The first transmission mechanism 27 of the present embodiment includes a first drive pulley 28 provided on the output shaft of the drive body M1, a first driven pulley 29 provided on the rotary shaft 25, and a first wound around both pulleys. A belt transmission mechanism including the transmission belt 30 is provided. However, the first transmission mechanism 27 can be replaced with another transmission mechanism such as a chain transmission mechanism or a gear transmission mechanism. In addition, the operation of the driving body M1 is controlled by the control unit 31.

  The rotational speed detector 16 may be a known type such as an electromagnetic type or a photoelectric type, and the rotational speed detector 16 reads a portion to be read such as a concavo-convex shape or a light reflection plate provided in the holder 22. To detect the rotational speed of the cage 22.

  A rotary current collector 11 is provided in the middle of the electrical wiring 33 that connects the strain detection sensor 13 and the strain gauge 14. The rotary current collector 11 detects a detection signal while preventing twisting of the electrical wiring 33 between the strain detection sensor 13 rotating together with the cage 22 and the stationary strain gauge 14 and disconnection due to the twist. Is possible.

  Specifically, the rotary current collector 11 is connected to the rotating body (first component) 36 connected to the strain detection sensor 13 via the first electric wiring 33a, and to the strain gauge 14 via the second electric wiring 33b. The stationary body (second component) 37 is provided, and the rotating body 36 and the stationary body 37 are configured to be relatively rotatable. A plurality of intermediate rotating bodies (intermediate parts) 38 are provided in series on the same rotational axis between the rotating body 36 and the stationary body 37. The rotating body 36 is rotationally driven by the second driving means 39, and the plurality of intermediate rotating bodies 38 are rotationally driven by the third driving means 40 and the fourth driving means 41, respectively.

A more specific configuration of the rotary current collector 11 will be described with reference to FIG.
The rotary current collector 11 of the present embodiment includes a casing 43 and a plurality of slip rings (current collecting members) 44 supported by the casing 43. The rotary current collector 11 of the present embodiment includes three slip rings 44.

  Each slip ring 44 includes a rotating body 36 and a stationary body 37 that are connected to each other so as to be relatively rotatable. In each slip ring 44, the rotating body 36 is provided with an input terminal (first terminal) 46, the stationary body 37 is provided with an output terminal (second terminal) 47, and the input terminal 46 and the output terminal 47. Are electrically connected inside the rotating body 36 and the stationary body 37. For example, the rotating body 36 is provided with a current collecting ring connected to the input terminal 46, and the stationary body 37 is provided with a brush connected to the output terminal 47, and the brush slides on the current collecting ring. By making contact, the input terminal 46 and the output terminal 47 are electrically connected.

  The plurality of slip rings 44 are arranged coaxially in series, and a stationary body 37 of one slip ring 44 and a rotating body 36 of another slip ring 44 are adjacent to each other. The stationary body 37 and the rotating body 36 adjacent to each other are coupled by a coupling member 49 so as to be integrally rotatable. A joined body (joined part) composed of the stationary body 37, the rotating body 36, and the joining member 49 constitutes the intermediate rotating body 38 described above. Further, the output terminal 47 of the stationary body 37 and the input terminal 46 of the rotating body 36 constituting one intermediate rotating body 38 are connected by a conductive member 50 made of a lead wire or the like. The intermediate rotating body 38 is rotatably supported by the casing 43 via the bearing member 51. A stationary body 37 of the slip ring 44 disposed at the right end portion in the series direction is fixed to the casing 43.

  In the present embodiment, the three slip rings 44 may be referred to as first to third slip rings 44a to 44c from the left side, respectively. The rotating body 36 and stationary body 37 of the first to third slip rings 44a to 44c are referred to as first to third rotating bodies 36a to 36c and first to third stationary bodies 37a to 37c, respectively. The intermediate rotator 38 may be referred to as a first intermediate rotator 38a and a second intermediate rotator 38b from the left side.

Among the plurality of slip rings 44, the input terminal 46 of the first rotating body 36a of the first slip ring 44a disposed at one end in the series direction (left end in FIG. 2) is distorted via the first electric wiring 33a. The detection sensor 13 is connected, and the output terminal 47 of the third stationary body 37c of the third slip ring 44c disposed at the other end in the series direction (the right end in FIG. 2) is distorted via the second electric wiring 33b. A total of 14 (see FIG. 1) is connected.
The second drive means 39 includes a drive body M2 including a servo motor or the like directly connected to the first rotating body 36a of the first slip ring 44a or indirectly through another member. .

  As shown in FIG. 1, the third and fourth driving means 40 and 41 for rotating the first and second intermediate rotating bodies 38a and 38b are respectively a driving body M3 and M4 made of a servo motor, and this driving body M3. , M4, and third and fourth transmission mechanisms 55, 56 for transmitting the rotational power of M4 to the first and second intermediate rotating bodies 38a, 38b. The third and fourth transmission mechanisms 55 and 56 of the present embodiment are provided on third and fourth drive pulleys 57 and 58 and intermediate rotary bodies 38a and 38b provided on output shafts of the drive bodies M3 and M4, respectively. The belt transmission mechanism includes third and fourth driven pulleys 59 and 60 and third and fourth transmission belts 61 and 62 wound around both pulleys. However, the third and fourth transmission mechanisms 55 and 56 can be replaced with other transmission mechanisms such as a chain transmission mechanism and a gear transmission mechanism.

As shown in FIG. 1, the output signal of the rotational speed detector 16 that detects the rotational speed of the cage 22 is input to the control unit 31, and the control unit 31 performs a second operation based on the rotational speed of the cage 22. Controls the operation of the fourth driving bodies M2 to M4.
Specifically, as illustrated in FIG. 2, the control unit 31 rotates the first rotating body 36 a of the first slip ring 44 a of the rotary current collector 11 at the same rotational speed as that of the cage 22. The second drive body M2 is controlled to operate. Thereby, it can prevent that the 1st electrical wiring 33a which connects the distortion | strain detection sensor 13 and the input terminal 46 of the 1st rotary body 36a twists.

The controller 31 (see FIG. 1) controls the operation of the third driver M3 so that the first intermediate rotator 38a is rotated at a lower speed than the cage 22 and the first rotator 36a. For example, when the rotational speeds of the cage 22 and the first rotating body 36a are 6000 min ⁻¹ , the first intermediate rotating body 38a is rotated at, for example, 4000 min ⁻¹ . In this case, the relative rotational speed between the first rotating body 36a and the first stationary body 37a in the first slip ring 44a is 6000 min ⁻¹ −4000 min ⁻¹ = 2000 min ⁻¹ .
In addition, the control unit 31 controls the operation of the fourth driving body so as to rotate the second intermediate rotator 38b at a lower speed (for example, 2000 min ⁻¹ ) than the first intermediate rotator 38a. In this case, the relative rotational speed of the second rotating body 36b and the second stationary body 37b in the second slip ring 44b is 4000 min ⁻¹ −2000 min ⁻¹ = 2000 min ⁻¹ . Further, the relative rotational speed between the third rotating body 36c and the third stationary body 37c in the third slip ring 44c is 2000 min ⁻¹ .

In the case of the above example, the rotational speed of the cage 22 is 6000 min ⁻¹ , but the relative rotational speed between the rotating body 36 and the stationary body 37 in each slip ring 44 is 2000 min ⁻¹ . For this reason, if a permissible rotational speed of each slip ring 44 is 2000 min ⁻¹ , it is possible to cope with a maximum rotational speed of the cage 22 of 6000 min ⁻¹ . That is, even if the allowable rotation speed of each slip ring 44 is low, it is possible to cope with a higher rotation speed of the cage 22.

  In addition, since the rotational speed of each slip ring 44 can be kept low compared to the case where one slip ring 44 is used alone, it is possible to prevent the life from being reached early and to result from high-speed rotation. The generation of noise can also be suppressed.

  Moreover, since the rotary current collector 11 of the above embodiment is configured by arranging a plurality of slip rings 44 in series, general-purpose devices can be used as the individual slip rings 44. Therefore, the rotary current collector 11 can be manufactured at low cost.

  In the above example, the rotation speed of the first rotating body 36a, the rotation speed of the first intermediate rotating body 38a, and the rotation speed of the second intermediate rotating body 38b of the first slip ring 44a are constant ratios. However, it may be reduced at an arbitrary ratio.

The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the invention described in the claims.
For example, the rotary current collector 11 of the above embodiment uses three slip rings (current collecting members), but may use two or four or more slip rings. Further, slip rings having different allowable rotational speeds may be combined. Moreover, you may use a rotary connector instead of a slip ring as a current collection member.

  The intermediate rotator is configured by combining the stationary body of one slip ring and the rotator of another slip ring adjacent thereto, but may be configured by a single component. Further, the number of intermediate rotating bodies between the rotating body and the stationary body is not limited to a plurality, and may be only one.

  The state detection device of the present invention is not limited to the strain of the cage, and may detect other states such as temperature, and the present invention is not limited by the detection target.

  10: State detection device, 11: Rotary current collector, 13: Strain detection sensor (state detection sensor), 14: Strain meter (receiver), 15: Rotation device, 18: Rolling bearing, 22: Cage, 26 : First driving means, 31: control unit, 36: rotating body (first part), 37: stationary body (second part), 38: intermediate rotating body (intermediate part), 39: second driving means, 40: Third driving means, 41: fourth driving means, 44: slip ring (current collecting member), 46: input terminal (first terminal), 47: output terminal (second terminal), 49: coupling member, 50 : Conductive member

Claims (3)

Rotation comprising a first part having a first terminal and a second part having a second terminal electrically connected to the first terminal and rotatable relative to the first part Type current collector,
Between the first component and the second component, a plurality of intermediate components arranged in series coaxially with the first and second components,
The first part and the intermediate part adjacent to the first part, the intermediate part and the second part adjacent to the intermediate part, and the intermediate parts adjacent to each other are connected to each other so as to be relatively rotatable,
Further, a plurality of drive means for rotating the first part and the intermediate part, respectively, and the rotational speeds of the first part and the intermediate part in a direction from the first part side to the second part side. And a control unit that controls each of the driving means so as to decrease sequentially. A first part having a first terminal; and a second part having a second terminal electrically connected to the first terminal and coupled to the first part so as to be relatively rotatable. A plurality of current collecting members,
A plurality of current collecting members are coaxially arranged in series so that the first parts and the second parts are alternately arranged, and the second parts of one current collecting member adjacent to each other and the other parts The first component of the current collecting member is coupled so as to be integrally rotatable to form a coupled component, and the second terminal of the second component and the first terminal of the first component in the coupled component are electrically conductive Connected by members,
Furthermore, a plurality of drive means for rotating and driving the first component and the coupling component located at one end in the series direction of a plurality of current collecting members, and the rotational speeds of the first component and the coupling component are determined in the series direction. A control unit that controls each of the driving means so as to sequentially decrease in a direction from the first component side at one end toward the second component side at the other end in the series direction. Electrical equipment. A rotating device for rotating a rolling bearing having a cage;
The rotary current collector according to claim 1 or 2 ,
A state detection sensor attached to the retainer to detect the state of the retainer and connected to the first terminal of the first component disposed at one end in the series direction of the rotary current collector by an electrical wiring; ,
A receiving unit that is connected to a second terminal of the second component disposed at the other end in the series direction of the rotary current collector by an electrical wiring and that receives a detection signal of the state detection sensor; A state detection device for a cage for a rolling bearing.

Images