JP6896518B2 - Spindle device - Google Patents

Description

The present invention relates to a spindle device.

Conventionally, a locking device that locks the rotating shaft of a spindle is known. For example, in Japanese Patent Application Laid-Open No. 2013-052472 (Patent Document 1), a lock device main body provided outside the spindle engages with a fastening surface or a fitting recess provided on the spindle side such as a spindle housing or a motor. Discloses a spindle lock device that locks a spindle (rotating shaft) by doing so.

Japanese Unexamined Patent Publication No. 2013-052472

The spindle lock device described in Patent Document 1 includes an air bearing. Therefore, even after the motor for rotationally driving the spindle (rotating shaft) is stopped, the air supplied to the air bearing may act on the spindle and the spindle may continue to rotate.

Further, in a so-called air turbine spindle device in which a plurality of rotary blades provided on a rotary shaft are rotationally driven by receiving compressed air, the rotary shaft continues to rotate due to inertia even after the supply of driving gas is stopped.

If the rotating shaft is locked by the locking device while the rotating shaft is not stopped in this way, at least one of the rotating shaft, the locking device, and the bearing that supports the rotating shaft may be damaged. This damage is particularly problematic in electrostatic coating spindle devices in which the rotating shaft is rotated at high speed.

The present invention has been made in view of such problems of the prior art. A main object of the present invention is to provide a spindle device capable of locking the rotation of a spindle without damaging the spindle.

The spindle device according to the present invention includes a housing and a rotating shaft arranged inside the housing. One or more openings are arranged on the outer peripheral surface of the rotating shaft. One or more openings have a pair of inner walls that face each other in the direction of rotation of the axis of rotation. The housing includes one or more brakes and one or more locks. One or more brake portions have contact members that can come into contact with the rotating shaft. The first state in which the one or more locks have a fixing member that can be arranged inside the one or more openings, the fixing member is arranged outside the one or more openings, and the fixing member It is provided so as to be switchable from a second state arranged inside one or more openings.

According to the spindle device, the rotation of the spindle (rotating shaft) can be decelerated by one or more brake portions, and the rotation of the spindle can be locked by one or more lock portions. Therefore, the spindle device can lock the rotation of the spindle without damaging the spindle.

In the spindle device of one aspect of the present invention, the rotating shaft includes a first portion, a second portion, and a third portion located between the first portion and the second portion in the thrust direction. One or more openings are arranged on the outer peripheral surface of the third portion. The housing faces the first portion in the radial direction and faces the first journal bearing portion that pivotally supports the rotation axis, and the housing faces the second portion in the radial direction and has the rotation axis as the axis. It further includes a supporting second journal bearing portion. The one or more brake portions and the one or more lock portions are arranged between the first journal bearing portion and the second journal bearing portion in the thrust direction.

In one aspect of the spindle device of the present invention, one or more brakes and one or more locks are provided inside the housing. Therefore, the spindle device of one aspect of the present invention is suitable for a spindle device for electrostatic coating or the like in which it is difficult to secure an external space required for installing the lock device.

In the spindle device of one aspect of the present invention, one or more brake portions can switch between a third state in which the contact member is not in contact with the rotating shaft and a fourth state in which the contact member is in contact with the rotating shaft. It may be provided in.

In the spindle device of one aspect of the present invention, one or more brake portions can be switched from the third state to the fourth state according to the timing when one or more lock portions are switched from the first state to the second state. .. Therefore, for example, the rotation of the rotating shaft may be sufficiently decelerated by one or more brake portions and then locked by one or more lock portions.

In the spindle device of one aspect of the present invention, one or more brake portions may be provided so that the contact member can be switched from the third state to the fourth state by receiving the pressure of the brake portion driving gas. The one or more lock portions may be provided so that the fixing member can be switched from the first state to the second state by receiving the pressure of the lock portion driving gas.

The manufacturing cost of the spindle device of one aspect of the present invention is lower than the manufacturing cost of the spindle device of the comparative example in which one or more brake portions and one or more lock portions are provided so as to be electromagnetically controllable. Further, the spindle device of one aspect of the present invention is a spindle for electrostatic coating as compared with a spindle device of a comparative example in which one or more brake portions and one or more lock portions are provided so as to be electromagnetically controllable. Suitable for equipment. This is because, in the electrostatic coating spindle device, a high voltage of tens of thousands of volts is applied to the paint passing through the inside of the electrostatic coating spindle device, and the spindle device of one aspect of the present invention is inside the electrostatic coating spindle device. This is because the discharge of the above can be prevented.

In the spindle device of one aspect of the present invention, the housing has a first flow passage for supplying a gas for driving a brake portion to one or more brake portions, and a gas for driving a lock portion in one or more lock portions. A second flow passage for supplying is provided. A portion of the first flow passage that is located upstream of the one or more brake portions is connected to a portion of the second flow passage that is located upstream of the one or more lock portions. The one or more brake portions may further have a first elastic member that applies an elastic force to the contact member in a direction away from the portion of the rotation shaft that the contact member contacts in the fourth state. The one or more lock portions may further have a second elastic member that applies an elastic force to the fixing member in a direction away from the portion of the rotation shaft that the fixing member contacts in the second state. The spring constant of the first elastic member is smaller than the spring constant of the second elastic member.

In the spindle device of one aspect of the present invention, for example, the supply of the brake unit driving gas to the first flow passage and the supply of the lock unit driving gas to the second flow passage can be controlled simultaneously by one control unit. One or more lock units even when the timing at which the brake unit drive gas is supplied to one or more brake units and the timing at which the lock unit drive gas is supplied to one or more lock units are simultaneous. The switching from the third state to the fourth state of one or more brake units can be realized before the switching from the first state to the second state.

In the spindle device of one aspect of the present invention, the one or more brake portions may further include a third elastic member that applies an elastic force to the contact member in the direction toward the rotation axis. One or more brake portions may be provided so as to be able to maintain a state in which the contact member is in contact with the rotating shaft by the elastic force of the third elastic member.

In the spindle device of one aspect of the present invention, the contact member keeps in contact with the rotating shaft unless a force larger than the elastic force is applied to the contact member in a direction opposite to the direction toward the rotating shaft. When a force larger than the elastic force is applied to the contact member in a direction opposite to the direction toward the rotation axis, the contact member is separated from the rotation axis. For example, when the rotating shaft is rotated at high speed (for example, at tens of thousands of rpm or more), the contact member is separated from the rotating shaft due to the dynamic pressure effect accompanying the high-speed rotation of the rotating shaft, and one or more brake units. Does not interfere with the rotation of the axis of rotation. On the other hand, when the rotation of the rotating shaft is decelerated and the action of the dynamic pressure effect is reduced, the contact member comes into contact with the rotating shaft, and one or more brake portions can decelerate the rotation of the rotating shaft. In this way, the one or more brake portions are configured to be switchable between a third state in which the contact member is not in contact with the rotating shaft and a fourth state in which the contact member is in contact with the rotating shaft.

In the spindle device of one aspect of the present invention, one or more brake portions can switch between a third state in which the contact member is not in contact with the rotating shaft and a fourth state in which the contact member is in contact with the rotating shaft. It is provided in. The rotary shaft includes a plurality of rotary blades, and is rotationally driven by supplying a driving gas to the plurality of rotary blades. The housing is provided with a third flow passage for supplying the driving gas to one or more brake portions. The one or more brake portions may be provided so that the contact member can switch from the fourth state to the third state by receiving the pressure of the driving gas supplied from the third flow passage.

According to the spindle device of one aspect of the present invention, one or more brake portions can be maintained in the third state while the rotating shaft is rotating at high speed. One or more braking units may apply a high braking force to the rotating shaft in the fourth state.

In one aspect of the spindle device of the present invention, the housing further includes a plurality of brakes and a retainer that holds the plurality of brakes and one or more locks.

In the spindle device of one aspect of the present invention, a plurality of braking portions can apply braking force to the rotating shaft. Therefore, the spindle device of one aspect of the present invention can decelerate the rotation of the rotating shaft in a shorter time than the spindle device having only one brake portion in the housing.

According to the present invention, it is possible to provide a spindle device capable of locking the rotation of the spindle without damaging the spindle.

It is sectional drawing which shows the 1st state and 3rd state of the spindle device which concerns on embodiment. It is a partial cross-sectional view which shows the 1st state and 4th state of the spindle device which concerns on embodiment. It is a perspective view which shows the brake part holding part of the spindle device which concerns on embodiment. It is sectional drawing which shows the spindle holder of the coating apparatus which concerns on embodiment. It is sectional drawing which shows the spindle apparatus 100 which attached the cup in the coating apparatus which concerns on embodiment. It is a partial cross-sectional view which shows the modification of the spindle device which concerns on embodiment. It is a partial cross-sectional view which shows the other modification of the spindle device which concerns on embodiment. It is a perspective view which shows the holding part of the other modification of the spindle device which concerns on embodiment. It is a partial cross-sectional view which shows the further modification of the spindle device which concerns on embodiment. It is a partial cross-sectional view which shows the further modification of the spindle device which concerns on embodiment. It is a partial cross-sectional view which shows the further modification of the spindle device which concerns on embodiment. It is a partial cross-sectional view which shows the further modification of the spindle device which concerns on embodiment.

Hereinafter, embodiments will be described with reference to the drawings. In the following drawings, the same or corresponding parts are given the same reference numbers, and the description is not repeated.

<Spindle device configuration>
The configuration of the spindle device 100 according to the embodiment will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the spindle device 100 includes a rotating shaft 1 (spindle) and a housing 2.

The rotating shaft 1 includes a shaft portion and a thrust plate portion. Hereinafter, the extending direction of the shaft portion of the rotating shaft 1 and the central axis of the thrust plate portion is referred to as a thrust direction, and the radial direction of the rotating shaft 1 with respect to the central axis is referred to as a radial direction. The central axis of the shaft portion of the rotating shaft 1 is arranged coaxially with the central axis of the thrust plate portion. The rotating shaft 1 is rotatably supported in the circumferential direction around the central axis by a housing 2 described later.

The shaft portion of the rotating shaft 1 has a first portion 1a, a second portion 1b, and a third portion 1c. The shaft portion of the rotating shaft 1 has a cylindrical shape. In the thrust direction, the first portion 1a is spaced apart from the second portion 1b. The second portion 1b is arranged closer to the end of the rotating shaft 1 to which the cup 40 (see FIG. 4) is attached than the first portion 1a. Hereinafter, in the spindle device 100, one side in the thrust direction in which the cup is attached is referred to as a front side, and the other side is referred to as a rear side.

A third portion 1c is arranged between the first portion 1a and the second portion 1b. The length of the third portion 1c in the thrust direction is shorter than, for example, the lengths of the first portion 1a and the second portion 1b in the thrust direction.

One or more openings 1d are provided on the outer peripheral surface of the third portion 1c of the rotating shaft 1. The one or more openings 1d may be a plurality of openings 1d. The plurality of openings 1d have inner wall surfaces facing the rotation direction of the rotation shaft 1, that is, the circumferential direction. The plurality of openings 1d are arranged so as to be spaced apart from each other in the circumferential direction. In a cross section perpendicular to the thrust direction, the angle (central angle) formed by one end and the other end of one opening 1d in the circumferential direction with respect to the central axis of the rotating shaft 1 is less than 360 degrees, preferably 90 degrees. It is less than or equal to, more preferably less than or equal to 45 degrees. The material constituting the rotating shaft 1 includes, for example, iron (Fe). Preferably, the material constituting the rotating shaft 1 is a relatively high-strength material, for example, martensitic stainless steel or carbon steel. Strength can be evaluated, for example, by bending strength or hardness. The material constituting the portion of the rotating shaft 1 facing at least the plurality of openings 1d is hardened steel. In other words, it is preferable that the portion of the rotating shaft 1 facing at least the plurality of openings 1d is subjected to quenching treatment.

In the rotating shaft 1, the thrust plate portion is arranged on the rear side of the shaft portion. The first portion 1a is arranged closer to the thrust plate portion than the second portion 1b. The thrust plate portion protrudes in the radial direction from the shaft portion. The shaft portion and the thrust plate portion may be provided integrally or separately.

A plurality of rotary blades 1e are provided on the thrust plate portion. The plurality of rotary blades 1e are provided on, for example, a surface of the thrust plate portion located on the shaft portion side. Each of the plurality of rotary blades 1e is arranged so as to be spaced apart from each other in the circumferential direction.

The rotating shaft 1 is provided with a through hole 1f. The through hole 1f penetrates the rotation shaft 1 in the thrust direction. The hole axis of the through hole 1f extends along the thrust direction.

The housing 2 includes a first bearing sleeve 3, a second bearing sleeve 4, a first housing assembly 5, a second housing assembly 6, a first cover 7, a second cover 8, a lock portion 9, and a lock portion holding portion. 10, a third bearing sleeve 11, a nozzle plate 12, a brake portion 17, and a brake portion holding portion 18. Inside the housing 2, a flow path 13 for a rotary driving gas for driving the rotary shaft 1 and a bearing gas pressurized to form a hydrostatic gas bearing that rotatably supports the rotary shaft 1 are provided. The flow passages 14 and 15, the lock portion driving gas flow passage 16 (second flow passage) for driving the lock portion 9, and the brake portion driving gas flow passage 20 (second flow passage) for driving the brake portion 17. 1st flow passage) is provided.

The first bearing sleeve 3 is provided with a through hole 3a. The through hole 3a penetrates the first bearing sleeve 3 in the thrust direction. The hole axis of the through hole 3a extends along the thrust direction. The hole shaft of the through hole 3a is arranged coaxially with the central shaft of the rotating shaft 1. In the cross section perpendicular to the thrust direction, the shape of the through hole 3a is circular. The first portion 1a of the rotating shaft 1 is arranged inside the through hole 3a. A first bearing gap is provided between the inner peripheral surface of the through hole 3a and the outer peripheral surface of the first portion 1a of the rotating shaft 1. Further, a third bearing gap is provided between the surface of the first bearing sleeve 3 facing the rear side and the surface of the rotating shaft 1 facing the front side of the thrust plate portion.

The first bearing sleeve 3 is provided with a part of a flow passage 14 connected to the first bearing gap and the third bearing gap. One end of a portion of the flow passage 14 located in the first bearing sleeve 3 is arranged so as to be connected to the first bearing gap or the third bearing gap, and the other end is the outer peripheral surface of the first bearing sleeve 3 in the radial direction. Is located in.

The second bearing sleeve 4 is arranged at a distance from the first bearing sleeve 3 in the thrust direction. The second bearing sleeve 4 is provided with a through hole 4a. The through hole 4a penetrates the second bearing sleeve 4 in the thrust direction. The hole axis of the through hole 4a extends along the thrust direction. The hole shaft of the through hole 4a is arranged coaxially with the hole shaft of the through hole 3a. In the cross section perpendicular to the thrust direction, the shape of the through hole 4a is circular. The second portion 1b of the rotating shaft 1 is arranged inside the through hole 4a. A second bearing gap is provided between the inner peripheral surface of the through hole 4a and the outer peripheral surface of the first portion 1a of the rotating shaft 1.

The second bearing sleeve 4 is provided with a part of a flow passage 14 connected to the second bearing gap. One end of a portion of the flow passage 14 located in the second bearing sleeve 4 is arranged so as to be connected to the second bearing gap, and the other end is arranged on the outer peripheral surface of the second bearing sleeve 4 in the radial direction. ..

The first housing assembly 5 is provided with a through hole 5a. The through hole 5a penetrates the first housing assembly 5 in the thrust direction. The hole axis of the through hole 5a extends along the thrust direction. The hole shaft of the through hole 5a is arranged coaxially with, for example, the central shaft of the rotating shaft 1. The inner peripheral surface of the through hole 5a is arranged so as to face the outer peripheral surface of the first bearing sleeve 3. That is, the first bearing sleeve 3 is arranged inside the through hole 5a.

The portion located on the rear side of the first housing assembly 5 protrudes in the radial direction from the portion located on the front side of the first housing assembly 5. The portion located on the rear side of the first housing assembly 5 faces the plurality of rotary blades 1e of the rotary shaft 1 in the thrust direction.

A part of the flow passage 13 is provided in a portion located on the rear side of the first housing assembly 5. A part of the flow passage 14 is provided in a portion located on the front side of the first housing assembly 5. A part of the flow passage 14 provided in the first housing assembly 5 is connected to the first bearing gap and the third bearing gap through a part of the flow passage 14 provided in the first bearing sleeve 3.

The second housing assembly 6 is arranged at a distance from the first housing assembly 5 in the thrust direction. The second housing assembly 6 is provided with a through hole 6a. The through hole 6a penetrates the second housing assembly 6 in the thrust direction. The hole axis of the through hole 6a extends along the thrust direction. The hole shaft of the through hole 6a is arranged coaxially with the hole shaft of the through hole 5a. The inner peripheral surface of the through hole 6a is arranged so as to face the outer peripheral surface of the second bearing sleeve 4. That is, the second bearing sleeve 4 is arranged inside the through hole 6a.

The second housing assembly 6 is provided with a part of the flow passage 14. A part of the flow passage 14 provided in the second housing assembly 6 is connected to the second bearing gap through a part of the flow passage 14 provided in the second bearing sleeve 4.

The first cover 7 is provided with a through hole 7a. The through hole 7a penetrates the first cover 7 in the thrust direction. The hole axis of the through hole 7a extends along the thrust direction. The hole shaft of the through hole 7a is arranged coaxially with, for example, the central shaft of the rotating shaft 1. The inner peripheral surface of the through hole 7a is arranged so as to face the outer peripheral surface of the first housing assembly 5. That is, the first housing assembly 5 is arranged inside the through hole 7a.

The first cover 7 is provided with a part of the flow passage 13. Further, the first cover 7 is provided with a part of the flow passage 14. A part of the flow passage 14 provided in the first cover 7 includes a branch portion in which one flow passage is branched into two flow passages on the inner peripheral side in the radial direction. One of the flow passages branched inside the first cover 7 in the flow passage 14 passes through the first bearing gap and each part of the flow passage 14 provided in the first bearing sleeve 3 and the first housing assembly 5. It is connected to the third bearing gap. The other flow passage branched inside the first cover 7 in the flow passage 14 passes through each part of the flow passage 14 provided in the lock portion holding portion 10, the second bearing sleeve 4, and the second housing assembly 6. Is connected to the second bearing gap.

On the surface of the first cover 7 located on the front side in the thrust direction, in the direction perpendicular to the thrust direction, that is, in the radial direction and the circumferential direction, the position relative to the brake portion holding portion 18 described later is held. A positioning portion may be provided. For example, a plurality of convex portions projecting to the front side of the surface may be provided on the surface of the first cover 7 located on the front side in the thrust direction.

The second cover 8 is arranged at a distance from the first cover 7 in the thrust direction. The second cover 8 is provided with a through hole 8a. The through hole 8a penetrates the second cover 8 in the thrust direction. The hole axis of the through hole 8a extends along the thrust direction. The hole shaft of the through hole 8a is arranged coaxially with the hole shaft of the through hole 7a. The inner peripheral surface of the through hole 8a is arranged so as to face the outer peripheral surface of the second housing assembly 6. That is, the second housing assembly 6 is arranged inside the through hole 8a.

The second cover 8 is provided with a part of the flow passage 14. A part of the flow passage 14 provided in the second cover 8 is connected to the second bearing gap via each part of the flow passage 14 provided in the second bearing sleeve 4 and the second housing assembly 6. ..

In order to hold the position of the second cover 8 on the surface located behind the thrust direction in the direction perpendicular to the thrust direction, that is, in the radial direction and the circumferential direction, relative to the lock portion holding portion 10 described later. The positioning portion of the above may be provided. For example, a plurality of convex portions projecting to the rear side of the surface may be provided on the surface of the second cover 8 located on the rear side in the thrust direction.

The lock portion 9 and the brake portion 17 are located between the first bearing sleeve 3 and the second bearing sleeve 4, between the first housing assembly 5 and the second housing assembly 6, and between the first cover 7 and the first cover 7 in the thrust direction. 2 It is arranged between the cover 8 and the cover 8.

As shown in FIGS. 1 and 2, the lock portion 9 has a pin 9a, a second elastic member 9b, a maintenance tap 9c, and a lid portion 9d. The lock portion 9 is arranged inside the through hole 10b of the lock portion holding portion 10 described later.

The pin 9a, which is a fixing member, includes a shaft portion and a flange portion. Each central axis of the shaft portion and the flange portion of the pin 9a extends along the radial direction. The central axis of the shaft portion of the pin 9a is arranged coaxially with the central axis of the flange portion. In the pin 9a, the flange portion is connected to the end portion of the shaft portion on the outer peripheral side in the radial direction. The flange portion of the pin 9a projects outward from the shaft portion of the pin 9a with respect to the central axis. In the cross section perpendicular to the radial direction, the maximum width of the flange portion of the pin 9a is larger than the maximum width of the shaft portion of the pin 9a.

At least a portion of the shaft portion of the pin 9a may be disposed within the plurality of openings 1d. That is, the width of the shaft portion of the pin 9a in the circumferential direction is equal to or less than the width of the plurality of openings 1d in the circumferential direction, and the width of the shaft portion of the pin 9a in the thrust direction is the width of the plurality of openings 1d in the thrust direction. Is less than or equal to the width of. The cross-sectional shape of the shaft portion of the pin 9 perpendicular to the extending direction of the central axis is, for example, a circular shape. The material constituting the pin 9 contains, for example, iron (Fe). Preferably, the material constituting the pin 9 is a relatively high-strength material, for example, hardened steel. Strength can be evaluated, for example, by bending strength or hardness.

The second elastic member 9b has one end and the other end, and can generate an elastic force according to a change in the distance between the one end and the other end. The second elastic member 9b can apply an elastic force to the pin 9a in a direction opposite to the direction toward the rotation axis 1. The second elastic member 9b is, for example, a spring. One end of the second elastic member 9b is connected to a lock portion holding portion 10 which will be described later, and the lock portion holding portion 10 restricts the movement toward the inner peripheral side in the radial direction. The other end of the second elastic member 9b is connected to the flange portion of the pin 9a. As a result, the second elastic member 9b can apply an elastic force to the pin 9a to urge the pin 9a toward the outer peripheral side in the radial direction.

A maintenance tap 9c having a hole axis along the radial direction is provided at the end of the pin 9a on the outer peripheral side in the radial direction.

The lid portion 9d is arranged on the outer peripheral side in the radial direction with respect to the pin 9a, the second elastic member 9b, and the maintenance tap 9c. The lid portion 9d may have any configuration as long as it restricts the movement of the pin 9a toward the outer peripheral side in the radial direction and can form a part of the flow passage 16. For example, the lid portion 9d is provided with a through hole penetrating in the radial direction. As a result, the movement of the pin 9a toward the outer peripheral side in the radial direction is restricted by the lid portion 9d. Further, the through hole of the lid portion 9d forms a space (a part of the flow passage 16) through which the gas for driving the lock portion 9 for driving the lock portion 9 can flow on the outer peripheral side of the pin 9a. The lock portion driving gas supplied to the space can apply an inward force in the radial direction to the pin 9a.

The lock portion 9 is provided so as to be able to switch between a first state in which the pin 9a is arranged outside the opening 1d and a second state in which the pin is arranged inside the opening 1d. Switching between the first state and the second state is controlled by the presence or absence of gas supply to the space arranged on the outer peripheral side of the pin 9a inside the lock portion holding portion 10. In the first state, the pin 9a is housed inside the through hole 10b of the lock portion holding portion 10, which will be described later, and does not project inward from the inner peripheral surface of the through hole 10a of the lock portion holding portion 10. In the first state, the tip of the pin 9a is arranged inside, for example, the inner peripheral portion of the through hole 10b. In the second state, the pin 9a projects inward from the inner peripheral surface of the through hole 10a of the lock portion holding portion 10. In the second state, the pressure of the gas supplied into the through hole of the lid portion 9d applies a force from the outside to the inside in the radial direction with respect to the pin 9a. The second elastic member 9b in the second state is compressed and urged more than the second elastic member 9b in the first state.

The lock portion 9 is held by the lock portion holding portion 10. The lock portion holding portion 10 is provided between the first bearing sleeve 3 and the second bearing sleeve 4, between the first housing assembly 5 and the second housing assembly 6, and between the first cover 7 and the second cover 8. Is located in.

As shown in FIGS. 1 and 2, the lock portion holding portion 10 is provided with a through hole 10a. The through hole 10a penetrates the lock portion holding portion 10 in the thrust direction. The hole axis of the through hole 10a extends along the thrust direction. The hole shaft of the through hole 10a is arranged coaxially with, for example, the central shaft of the rotating shaft 1. The inner peripheral surface of the through hole 10a is arranged so as to face the outer peripheral surface of the third portion 1c of the rotating shaft 1 at a distance in the radial direction. That is, the third portion 1c of the rotating shaft 1 is arranged inside the through hole 10a, and the circumferential direction is between the inner peripheral surface of the through hole 10a and the outer peripheral surface of the third portion 1c of the rotating shaft 1. There is a gap connected to the.

As shown in FIGS. 1 and 2, the lock portion holding portion 10 is further provided with a through hole 10b. The through hole 10b penetrates the lock portion holding portion 10 in the radial direction. One end of the through hole 10b is opened on the inner peripheral surface of the through hole 10a, and the other end of the through hole 10b is opened on the outer peripheral surface of the lock portion holding portion 10.

As shown in FIGS. 1 and 2, the through hole 10b is provided so that the hole diameter of the inner peripheral portion located inside in the radial direction is smaller than the hole diameter of the outer peripheral portion located outside in the radial direction. .. The hole diameter of the inner peripheral portion of the through hole 10b is larger than the outer diameter of the shaft portion of the pin 9a, but smaller than the outer diameter of the flange portion of the pin 9a and the outer diameter of the second elastic member 9b. Although the lock portion 9 is arranged inside the outer peripheral portion of the through hole 10b, only the shaft portion of the pin 9a can move inside the inner peripheral portion of the through hole 10b. As a result, the movement of the lock portion 9 toward the inner peripheral side in the radial direction is restricted by the lock portion holding portion 10.

The hole diameter of the inner peripheral portion of the through hole 10b may be smaller than the length of each of the plurality of openings 1d of the rotating shaft 1 in the circumferential direction. The hole diameter of the inner peripheral portion of the through hole 10b may be equal to or larger than the length of each of the plurality of openings 1d of the rotating shaft 1 in the circumferential direction.

As shown in FIGS. 1 and 2, the other end of the through hole 10b of the lock portion holding portion 10 is reduced in diameter by the lid portion 9d. The lid portion 9d is detachably fixed to, for example, the through hole 10b. The lid portion 9d is fitted into, for example, the through hole 10b.

As shown in FIG. 1, the lock portion holding portion 10 is further provided with a through hole 10c. The through hole 10c penetrates the lock portion holding portion 10 in the radial direction. One end of the through hole 10c is opened on the inner peripheral surface of the through hole 10a, and the other end of the through hole 10c is opened on the outer peripheral surface of the lock portion holding portion 10. The through hole 10c is not connected to the through hole 10b inside the lock portion holding portion 10. The through hole 10c communicates with the through hole 10b through the gap provided between the inner peripheral surface of the through hole 10a and the outer peripheral surface of the third portion 1c of the rotating shaft 1. The through holes 10c are arranged at intervals from the through holes 10b in the circumferential direction. The hole diameter of the through hole 10c is smaller than, for example, the hole diameter of the outer peripheral portion of the through hole 10b.

As shown in FIG. 1, the lock portion holding portion 10 is further provided with a through hole 10d. The through hole 10d penetrates the lock portion holding portion 10 in the thrust direction. One end of the through hole 10d is opened on a surface located on the rear side of the lock portion holding portion 10 facing the surface located on the front side of the brake portion holding portion 18 described later. One end of the through hole 10d is opened on a surface located on the front side of the lock portion holding portion 10 facing the surface located on the rear side of the second cover 8. The through hole 10d is not connected to the through hole 10a, 10b, 10c inside the lock portion holding portion 10.

The lock portion holding portion 10 is provided with a part of the flow passage 14. A part of the flow passage 14 provided in the lock portion holding portion 10 is composed of a through hole 10d. Further, the lock portion holding portion 10 is provided with a part of the flow passage 16. A part of the flow passage 16 provided in the lock portion holding portion 10 is composed of a through hole 10b and a through hole 10c.

Positioning of the lock portion holding portion 10 on both end faces in the thrust direction to hold a position relative to the first cover 7 or the second cover 8 in the direction perpendicular to the thrust direction, that is, in the radial direction and the circumferential direction. A unit may be provided. For example, a plurality of convex portions protruding from the surface may be provided on the surface located on the rear side of the lock portion holding portion 10. The plurality of convex portions may be provided so as to be fitted with each of the plurality of concave portions 18e of the brake portion holding portion 18 described later. A plurality of recesses recessed with respect to the surface may be provided on the surface of the lock portion holding portion 10 located on the front side. The plurality of concave portions may be provided so as to be able to fit with the plurality of convex portions of the second cover 8.

The third bearing sleeve 11 is provided with a through hole 11a, and the through hole 11a penetrates the third bearing sleeve 11 in the thrust direction. The hole axis of the through hole 11a extends along the thrust direction. The hole shaft of the through hole 11a is arranged coaxially with the central shaft of the rotating shaft 1 and the hole shaft of the through hole 3a. The front surface of the third bearing sleeve 11 is arranged so as to face the rear surface of the thrust plate portion of the rotating shaft 1. A fourth bearing gap is provided between the front surface of the third bearing sleeve 11 and the rear surface of the thrust plate portion of the rotating shaft 1. The third bearing sleeve 11 is provided with a part of the flow passage 15.

The nozzle plate 12 has a surface 12a facing the front side, which faces the surface facing the rear side of the thrust plate portion of the rotating shaft 1 in the thrust direction. Further, the nozzle plate 12 is provided with a through hole 12b that is open to the surface 12a facing the front side. The through hole 12b penetrates the nozzle plate 12 in the thrust direction. The hole axis of the through hole 12b extends along the thrust direction. The hole shaft of the through hole 12b is arranged coaxially with the central shaft of the rotating shaft 1 and the hole shaft of the through hole 3a. The hole diameter of the front portion of the through hole 12b is smaller than the outer diameter of the thrust plate portion of the rotating shaft 1. The inner peripheral surface of the front side portion of the through hole 12b is arranged so as to face the outer peripheral surface of the third bearing sleeve 11. A third bearing sleeve 11 is arranged inside the front portion of the through hole 12b. The nozzle plate 12 is provided with a part of the flow passage 15. A part of the flow passage 15 provided in the nozzle plate 12 is connected to the fourth bearing gap through a part of the flow passage 15 provided in the third bearing sleeve 11.

The nozzle plate 12 further has a convex portion that protrudes forward in the thrust direction with respect to the surface 12a facing the front side. The front surface of the convex portion of the nozzle plate 12 is arranged so as to face the rear surface of the first cover 7 in the thrust direction. A part of the flow passage 13 is provided in the convex portion of the nozzle plate 12.

The nozzle plate 12 is provided with a rotation sensor insertion port 12c. The rotation sensor insertion port 12c penetrates the nozzle plate 12 in the thrust direction.

As shown in FIGS. 1 and 2, the brake portion 17 has a contact member 17a, a first elastic member 17b, and a lid portion 17c. The brake portion 17 is arranged inside the through hole 18b of the brake portion holding portion 18, which will be described later.

The contact member 17a includes a shaft portion and a flange portion. Each central axis of the shaft portion and the flange portion of the contact member 17a extends along the radial direction. The central axis of the shaft portion of the contact member 17a is arranged coaxially with the central axis of the flange portion. In the contact member 17a, the flange portion is connected to the end portion of the shaft portion on the outer peripheral side in the radial direction. The flange portion of the contact member 17a projects outward from the shaft portion of the contact member 17a with respect to the central axis. In the cross section perpendicular to the radial direction, the maximum width of the flange portion of the contact member 17a is larger than the maximum width of the shaft portion of the contact member 17a. When viewed from the radial direction, the planar shape of the end portion of the shaft portion of the contact member 17a on the inner peripheral side in the radial direction is, for example, a circular shape. The end surface of the contact member 17a on the inner peripheral side in the radial direction is, for example, a plane perpendicular to the radial direction.

The end portion of the contact member 17a on the inner peripheral side in the radial direction can be brought into contact with the outer peripheral surface of the third portion 1c of the rotating shaft 1. The cross-sectional shape of the shaft portion of the contact member 17a perpendicular to the extending direction of the central axis is, for example, a circular shape. The material constituting the contact member 17a includes, for example, carbon (C). Preferably, the material constituting the contact member 17a is a material having good slidability, for example, a carbon-based material. Strength can be evaluated, for example, by bending strength or hardness.

The first elastic member 17b has one end and the other end, and can generate an elastic force according to a change in the distance between the one end and the other end. The first elastic member 17b can apply an elastic force to the contact member 17a in a direction opposite to the direction toward the rotation axis 1. The first elastic member 17b is, for example, a spring. One end of the first elastic member 17b is connected to a brake portion holding portion 18 described later, and the movement of the first elastic member 17b toward the inner peripheral side in the radial direction is restricted by the brake portion holding portion 18. The other end of the first elastic member 17b is connected to the flange portion of the contact member 17a. As a result, the first elastic member 17b can apply an elastic force to the contact member 17a to urge the contact member 17a toward the outer peripheral side in the radial direction. The spring constant of the first elastic member 17b may be equal to the spring constant of the second elastic member 9b, or may be smaller than the spring constant of the second elastic member 9b.

The lid portion 17c is arranged on the outer peripheral side in the radial direction with respect to the contact member 17a and the first elastic member 17b. The lid portion 17c may have any configuration as long as it restricts the movement of the contact member 17a toward the outer peripheral side in the radial direction and can form a part of the flow passage 20. For example, the lid portion 17c is provided with a through hole penetrating in the radial direction. As a result, the movement of the contact member 17a toward the outer peripheral side in the radial direction is restricted by the lid portion 17c. Further, the through hole of the lid portion 17c forms a space (a part of the flow passage 20) through which the brake portion driving gas for driving the brake portion 17 can flow on the outer peripheral side of the contact member 17a. .. The brake unit driving gas supplied to the space can apply an inward force in the radial direction to the contact member 17a.

The brake portion 17 is provided so as to be able to switch between a third state in which the contact member 17a is not in contact with the rotating shaft 1 and a fourth state in which the contact member 17a is in contact with the rotating shaft 1. Switching between the third state and the fourth state is controlled by the presence or absence of gas supply to the space arranged on the outer peripheral side of the contact member 17a inside the brake portion holding portion 18. In the third state, the contact member 17a is housed inside the through hole 18b of the brake portion holding portion 18, which will be described later, and does not project inward from the inner peripheral surface of the through hole 18a of the brake portion holding portion 18. In the third state, the tip end portion of the contact member 17a is arranged inside, for example, the inner peripheral portion of the through hole 18b. In the fourth state, the contact member 17a projects inward from the inner peripheral surface of the through hole 18a of the brake portion holding portion 18. In the fourth state, a force from the outside to the inside in the radial direction is applied to the contact member 17a by the pressure of the gas supplied into the through hole of the lid portion 17c. The first elastic member 17b in the fourth state is compressed and urged more than the first elastic member 17b in the third state.

The brake portion 17 is held by the brake portion holding portion 18. The brake portion holding portion 18 is between the first bearing sleeve 3 and the second bearing sleeve 4, between the first housing assembly 5 and the second housing assembly 6, and between the first cover 7 and the second cover 8. Is located in. The brake portion holding portion 18 is arranged adjacent to the lock portion holding portion 10 in, for example, the thrust direction. The brake portion holding portion 18 is arranged, for example, on the front side of the first cover 7 and on the rear side of the lock portion holding portion 10.

As shown in FIGS. 1 to 3, the brake portion holding portion 18 is provided with a through hole 18a. The through hole 18a penetrates the brake portion holding portion 18 in the thrust direction. The hole axis of the through hole 18a extends along the thrust direction. The hole shaft of the through hole 18a is arranged coaxially with, for example, the central shaft of the rotating shaft 1. The inner peripheral surface of the through hole 18a is arranged so as to face the outer peripheral surface of the third portion 1c of the rotating shaft 1 at a distance in the radial direction. That is, the third portion 1c of the rotating shaft 1 is arranged inside the through hole 18a, and the circumferential direction is between the inner peripheral surface of the through hole 18a and the outer peripheral surface of the third portion 1c of the rotating shaft 1. There is a gap connected to the. The gap communicates with the gap provided between the inner peripheral surface of the through hole 10a of the lock portion holding portion 10 and the outer peripheral surface of the third portion 1c of the rotating shaft 1.

As shown in FIGS. 1 to 3, the brake portion holding portion 18 is further provided with a through hole 18b. The through hole 18b penetrates the brake portion holding portion 18 in the radial direction. One end of the through hole 18b is opened on the inner peripheral surface of the through hole 18a, and the other end of the through hole 18b is opened on the outer peripheral surface of the brake portion holding portion 18.

As shown in FIGS. 1 and 2, the through hole 18b is provided so that the hole diameter of the inner peripheral portion located inside in the radial direction is smaller than the hole diameter of the outer peripheral portion located outside in the radial direction. .. The hole diameter of the inner peripheral portion of the through hole 18b is larger than the outer diameter of the shaft portion of the contact member 17a, but smaller than the outer diameter of the flange portion of the contact member 17a and the outer diameter of the first elastic member 17b. Although the brake portion 17 is arranged inside the outer peripheral portion of the through hole 18b, only the shaft portion of the contact member 17a can move inside the inner peripheral portion of the through hole 18b. As a result, the movement of the brake portion 17 toward the inner peripheral side in the radial direction is restricted by the brake portion holding portion 18.

As shown in FIGS. 1 to 3, the other end of the through hole 18b of the brake portion holding portion 18 is reduced in diameter by the lid portion 17c. The lid portion 17c is detachably fixed to, for example, the through hole 18b. The lid portion 17c is fitted into, for example, the through hole 18b.

As shown in FIG. 3, the brake portion holding portion 18 is further provided with a through hole 18d. The through hole 18d penetrates the brake portion holding portion 18 in the thrust direction. One end of the through hole 18d is opened on a surface located on the rear side of the brake portion holding portion 18 facing the surface located on the front side of the first cover 7. One end of the through hole 18d is opened on a surface located on the front side of the brake portion holding portion 18 facing the surface located on the rear side of the lock portion holding portion 10. The through hole 18d is not connected to the through holes 18a and 18b inside the brake portion holding portion 18. The through hole 18d is connected to the through hole 10d.

The brake portion holding portion 18 is provided with a part of the flow passage 14. A part of the flow passage 14 provided in the brake portion holding portion 18 is composed of a through hole 18d. Further, the brake portion holding portion 18 is provided with a part of the flow passage 20. A part of the flow passage 20 provided in the brake portion holding portion 18 is composed of a through hole 18b.

Positioning of both end faces of the brake portion holding portion 18 in the thrust direction to hold a position relative to the first cover 7 or the second cover 8 in the direction perpendicular to the thrust direction, that is, in the radial direction and the circumferential direction. A unit may be provided. For example, as shown in FIG. 3, a plurality of recesses 18e recessed with respect to the surface may be provided on the surface of the brake portion holding portion 18 located on the front side. The plurality of recesses 18e may be provided so as to be able to fit with the plurality of convex portions of the lock portion holding portion 10. A plurality of recesses recessed with respect to the surface may be provided on the surface located on the rear side of the brake portion holding portion 18. The plurality of recesses may be provided so as to be able to fit with each of the plurality of protrusions of the first cover 7.

The air supply port of the flow passage 13 is provided on a surface located on the rear side of the nozzle plate 12. The exhaust port of the flow passage 13 is provided on the outer peripheral surface of the first cover 7. The air supply port of the flow passage 14 is provided, for example, on the outer peripheral surface of the first cover 7. In the flow passage 14, the portion connected to the first bearing gap and the third bearing gap and the portion connected to the second bearing gap are connected, for example, inside the first cover 7. Specifically, the portion of the flow passage 14 that is connected to the second bearing gap passes through the inside of the second cover 8 and the lock portion holding portion 10, and is the first in the flow passage 14 provided inside the first cover 7. It is connected to the portion connected to the 1st bearing gap and the 3rd bearing gap. The air supply port of the flow passage 15 is provided on a surface located on the rear side of the nozzle plate 12.

The air supply port and the exhaust port of the flow passage 16 are provided on the outer peripheral surface of the lock portion holding portion 10. The air supply port of the flow passage 16 is a through hole 10b of the lock portion holding portion 10, and the exhaust port of the flow passage 16 is a through hole 10c of the lock portion holding portion 10. The air supply port of the flow passage 20 is provided on the outer peripheral surface of the brake portion holding portion 18. The air supply port of the flow passage 20 is a through hole 18b of the brake portion holding portion 18. The exhaust port of the flow passage 20 is provided on the outer peripheral surface of the lock portion holding portion 10. The exhaust port of the flow passage 20 is a through hole 10c of the lock portion holding portion 10. The portion of the flow passage 20 located upstream of the brake portion 17 is not connected to the portion of the flow passage 16 located upstream of the lock portion 9, and both flow independently inside the housing 2. The road. The portion of the flow passage 20 located on the downstream side of the brake portion 17 is the portion of the flow passage 16 located on the downstream side of the lock portion 9, the inner peripheral surfaces of the through hole 18a and the through hole 10a, and the rotation shaft 1. The third portion 1c of the third portion 1c communicates with the outer peripheral surface of the third portion 1c through the gap provided.

The housing 2 can support the rotating shaft 1 in the radial direction in a non-contact manner by the static pressure of the gas supplied to the first bearing gap and the second bearing gap through the flow passage 14. That is, the first bearing sleeve 3 and the second bearing sleeve 4 can form a journal bearing.

Further, the housing 2 thrusts the rotating shaft 1 in the thrust direction due to the static pressure of the gas supplied to the third bearing gap through the flow passage 14 and the static pressure of the gas supplied to the fourth bearing gap through the flow passage 15. Can be supported in a non-contact manner. That is, the first bearing sleeve 3 and the third bearing sleeve 11 can form a thrust bearing.

The flow passage 16 and the flow passage 20 are separated from the flow passage 13, the flow passage 14, and the flow passage 15 by, for example, a plurality of O-rings 19 (see FIG. 1). One O-ring 19 is arranged between the outer peripheral surface of the first housing assembly 5 and the inner peripheral surface of the through hole 7a of the first cover 7. One O-ring 19 is arranged in the flow passage 13 and the flow passage 14 in front of the flow passage between the branch portion inside the first cover 7 and the first bearing gap and the third bearing gap. Another O-ring 19 is arranged between the outer peripheral surface of the second housing assembly 6 and the inner peripheral surface of the through hole 8a of the second cover 8. Another O-ring 19 is arranged in the flow passage 14 behind the flow passage between the branch portion inside the first cover 7 and the second bearing gap.

<Structure of painting equipment>
FIG. 4 is a cross-sectional view showing a spindle holder 41 to which the spindle device 100 is attached in the painting device 200 according to the embodiment. FIG. 5 is a cross-sectional view showing a spindle device 100 to which a cup 40 is attached in the painting device 200 according to the embodiment. The painting device 200 includes a spindle device 100, a cup 40, and a spindle holder 41.

The cup 40 is attached to the front end portion of the rotating shaft 1. The spindle holder 41 is provided with a receiving portion 41a into which at least a part of the housing 2 of the spindle device 100 can be inserted. The surface of the receiving portion 41a facing inward in the radial direction can be brought into contact with the outer peripheral surfaces of the first cover 7, the brake portion holding portion 18, and the locking portion holding portion 10 and a part of the outer peripheral surface of the second cover 8. It is provided.

The spindle holder 41 includes a turbine gas air supply port 42 for supplying a rotary drive gas to the flow passage 13 of the spindle device 100, and a turbine gas exhaust port 43 for exhausting the rotary drive gas from the flow passage 13. , A bearing gas air supply port 44 for supplying a bearing gas to the flow passage 14, a bearing gas air supply port 45 for supplying a bearing gas to the flow passage 15, and a lock portion driving gas to the flow passage 16. Lock gas air supply port 46 for supplying the lock gas supply port 46, a lock gas exhaust port 47 for exhausting the lock portion driving gas and the brake portion driving gas from the through hole 10c, and a paint supply port 48 for supplying the paint. And an insertion port 49 for inserting the rotation sensor. Further, the spindle holder 41 is provided with a brake gas air supply port 52 for supplying a brake unit driving gas to the flow passage 20.

A paint injection nozzle 50 is attached to the paint supply port 48. The paint injection nozzle 50 is inserted into the through hole 1a of the rotating shaft 1 with the spindle device 100 attached to the spindle holder 41, and its tip is arranged in the cup 40. A rotation sensor 51 is inserted into the insertion port 49.

<Operation of spindle device and painting device>
By supplying the driving gas into the flow passage 13 from the turbine gas air supply port 42 of the spindle holder 41, the rotating shaft 1 and the cup 40 rotate in the circumferential direction. At this time, the bearing gas is supplied from the bearing gas air supply ports 44 and 45 into the flow passages 14 and 15, so that the rotating shaft 1 is rotatably supported by the housing 2 in a non-contact manner.

When the paint is supplied into the cup 40 from the paint supply port 48 via the paint injection nozzle 50, the paint spreads to the outside of the cup 40 by the centrifugal force due to the rotation of the cup 40, and is sprayed when it separates from the cup 40. When the sprayed paint reaches the surface to be painted, painting is performed using the painting device 200.

At this time, the gas for driving the lock portion is not supplied to the flow passage 16 of the spindle device 100, and the lock portion 9 is in the first state in which the pin 9a is arranged outside the opening 1d. .. Further, the gas for driving the brake portion is not supplied to the flow passage 20 of the spindle device 100, and the brake portion 17 is in the third state in which the contact member 17a is not in contact with the rotating shaft 1.

The work for driving the brake portion 17 and the lock portion 9, such as when the cup 40 is replaced after the painting is completed, is as follows, for example.

First, the supply of the driving gas to the flow passage 13 is stopped. Next, the brake unit driving gas is supplied into the flow passage 20 from the brake gas air supply port 52 of the spindle holder 41. The gas for driving the brake unit is, for example, compressed air. The gas for driving the brake portion reaches the flange portion of the contact member 17a through the through hole of the lid portion 17c, and presses the contact member 17a inward in the radial direction. The contact member 17a is subjected to a pressure larger than the elastic force applied to the contact member 17a by the first elastic member 17b in the direction toward the rotation shaft 1 by the gas for driving the brake portion. As a result, the contact member 17a comes into contact with the outer peripheral surface of the third portion 1c of the rotating shaft 1, and the brake portion 17 is switched from the third state to the fourth state. By continuing to supply the brake unit driving gas to the flow passage 20, the brake unit 17 is maintained in the fourth state. As a result, the rotation of the rotating shaft 1 is decelerated, or the rotation of the rotating shaft 1 is stopped.

Next, the lock portion driving gas is supplied into the flow passage 16 from the lock gas air supply port 46 of the spindle holder 41. The lock portion driving gas is, for example, compressed air. The lock portion driving gas reaches the flange portion of the pin 9a through the through hole of the lid portion 9d, and presses the pin 9a inward in the radial direction. The lock portion driving gas applies a pressure to the pin 9a that is larger than the elastic force applied to the pin 9a by the second elastic member 9b and in a direction toward the rotation shaft 1. As a result, the pin 9a is inserted into any of the plurality of openings 1d provided in the third portion 1c of the rotating shaft 1, and the lock portion 9 is switched from the first state to the second state. By continuing to supply the lock portion driving gas to the flow passage 16, the lock portion 9 is maintained in the second state. As a result, the rotating shaft 1 is locked.

After the replacement work of the cup 40 is completed, the supply of the gas for driving the lock portion to the flow passage 16 is stopped. As a result, the pin 9a is pressed outward in the radial direction by the second elastic member 9b, and the lock portion 9 is switched from the second state to the first state.

The supply of the lock portion driving gas to the flow passage 16 can be controlled by a lock portion driving control unit (not shown) arranged outside the spindle holder 41. The lock unit drive control unit is, for example, a solenoid valve. The lock portion 9 may be in the first state when the lock portion driving solenoid valve is closed, and may be in the second state when the locking portion driving solenoid valve is opened.

Further, the supply of the brake unit driving gas to the flow passage 20 is stopped. As a result, the contact member 17a is pressed outward in the radial direction by the first elastic member 17b, and the brake portion 17 is switched from the fourth state to the third state.

The switching from the fourth state to the third state of the brake unit 17 is performed after the rotation of the rotating shaft 1 is decelerated or stopped to the extent that the switching from the first state to the second state of the lock unit 9 can be performed. As long as it can be done at any time. The switching from the fourth state to the third state of the brake unit 17 can be performed at the same time as the switching from the second state to the first state of the lock unit 9, as described above, or the first state of the lock unit 9. It can be carried out at any time after switching from the state to the second state. Alternatively, the switching from the fourth state to the third state of the brake unit 17 is performed after the rotation of the rotating shaft 1 is decelerated to such an extent that the switching from the first state to the second state of the lock unit 9 can be performed. Therefore, it can be performed before switching from the first state to the second state of the lock unit 9.

The supply of the brake unit driving gas to the flow passage 20 can be controlled by a brake unit driving control unit (not shown) arranged outside the spindle holder 41. The brake unit drive control unit is, for example, a solenoid valve. The brake unit 17 may be in the third state when the brake unit driving solenoid valve is closed, and may be in the fourth state when the braking unit driving solenoid valve is opened.

The brake unit driving gas may be exhausted together with the lock unit driving gas, for example. Specifically, the brake portion driving gas is a gap between the outer peripheral surface of the third portion 1c of the rotating shaft 1 and the through hole 18a of the brake portion holding portion 18, and the outer peripheral surface of the third portion 1c of the rotating shaft 1. It can be exhausted from the lock gas exhaust port 47 of the spindle holder 41 through the gap between the lock portion holding portion 10 and the through hole 10a of the lock portion holding portion 10 and the through hole 10c of the lock portion holding portion 10.

<Effect>
The spindle device 100 includes a housing 2 and a rotating shaft 1 arranged inside the housing 2. One or more openings 1d are arranged on the outer peripheral surface of the rotating shaft 1. The one or more openings 1d have a pair of inner walls facing each other in the rotation direction of the rotation shaft 1. The housing 2 includes a brake portion 17 and a lock portion 9. The brake portion 17 has a contact member 17a that can come into contact with the rotating shaft 1. The lock portion 9 has a pin 9a that can be arranged inside one or more openings 1d, a first state in which the pin 9a is arranged outside one or more openings 1d, and a pin 9a is 1. It is provided so as to be switchable from the second state arranged inside one or more openings 1d.

According to the spindle device 100, the brake portion 17 included in the housing 2 can decelerate the rotation of the rotary shaft 1 (spindle), and the lock portion 9 can lock the rotation of the rotary shaft 1. Therefore, the spindle device 100 can lock the rotation of the rotating shaft 1 without damaging the rotating shaft 1.

In the spindle device 100, the rotating shaft 1 includes a first portion 1a, a second portion 1b, and a third portion 1c located between the first portion 1a and the second portion 1b in the thrust direction. One or more openings 1d are arranged on the outer peripheral surface of the third portion 1c. The housing 2 faces the first portion 1a in the radial direction and faces the first journal bearing portion that pivotally supports the rotating shaft 1, and the housing 2 faces the second portion 1b in the radial direction. It further includes a second journal bearing portion that supports the rotating shaft 1. The brake portion 17 and the lock portion 9 are arranged between the first journal bearing portion and the second journal bearing portion in the thrust direction.

In the spindle device 100, the brake portion 17 and the lock portion 9 are provided inside the housing 2. Therefore, it is suitable for a spindle device for electrostatic coating or the like, for which it is difficult to secure an external space required for installing the lock device.

In the spindle device 100, the brake portion 17 is provided so as to be able to switch between a third state in which the contact member 17a is not in contact with the rotating shaft 1 and a fourth state in which the contact member 17a is in contact with the rotating shaft 1. There is.

In the spindle device 100, the brake unit 17 can be switched from the third state to the fourth state according to the timing at which the lock unit 9 is switched from the first state to the second state. Therefore, for example, the rotation of the rotating shaft 1 can be sufficiently decelerated by the brake unit 17 and then locked by the lock unit 9.

In the spindle device 100, the brake unit 17 is provided so that the contact member 17a can switch from the third state to the fourth state by receiving the pressure of the gas for driving the brake unit. The lock portion 9 is provided so that the pin 9a can be switched from the first state to the second state by receiving the pressure of the gas for driving the lock portion.

The manufacturing cost of the spindle device 100 is lower than the manufacturing cost of the spindle device of the comparative example in which the brake portion and the lock portion are provided so as to be electromagnetically controllable. Further, the spindle device 100 is more suitable for the electrostatic coating spindle device than the spindle device of the comparative example in which the brake portion and the lock portion are provided so as to be electromagnetically controllable. This is because, in the electrostatic coating spindle device, a high voltage of tens of thousands of volts is applied to the paint passing through the inside thereof, and the spindle device 100 prevents the discharge inside the electrostatic coating spindle device. Because you get it.

In the spindle device 100, the brake portion 17 exerts an elastic force on the contact member 17a in a direction opposite to the direction of the pressure applied to the contact member 17a when the brake portion 17 is switched from the third state to the fourth state. It further has a first elastic member 17b that imparts the above. The lock portion 9 is a second elastic member that applies an elastic force to the pin 9a in a direction opposite to the direction of the pressure applied to the pin 9a when the lock portion 9 is switched from the first state to the second state. It also has 9b.

In such a spindle device 100, the brake unit 17 is switched from the fourth state to the third state by the first elastic member 17b only by stopping the supply of the brake unit driving gas to the flow passage 20. Further, the lock portion 9 is switched from the second state to the first state by the second elastic member 9b only by stopping the supply of the lock portion driving gas to the flow passage 16.

<Modification example>
In the spindle device 100, the housing 2 includes, but is not limited to, only one brake portion 17. As shown in FIGS. 6 and 7, the housing 2 may include a plurality of brake portions 17. For example, as shown in FIG. 6, housing 2 may include two brakes 17. The two brake portions 17 have a rotational symmetry of 180 degrees with respect to, for example, the central axis of the rotating shaft 1. Further, as shown in FIG. 7, the housing 2 may include, for example, three brake portions 17. The three brake portions 17 have a rotational symmetry of 120 degrees around the central axis of the rotating shaft 1, for example.

In the spindle device 100, the housing 2 includes, but is not limited to, only one locking portion 9. As shown in FIG. 8, the housing 2 may include a plurality of locking portions 9. For example, the housing 2 may include two locking portions 9. The two lock portions 9 may have a rotational symmetry of 180 degrees with the central axis of the rotation axis 1 as the center, for example.

In the spindle device 100, the rotary shaft 1 can coast and rotate even after the supply of the rotary drive gas to the rotary shaft 1 is stopped. Further, even after the inertial rotation of the rotating shaft 1 has subsided, the rotating shaft 1 may continue to rotate due to the action of the gas supplied to the hydrostatic gas bearing or the so-called shaving air. In these cases, since it is necessary to lock the rotating shaft 1 while the rotating shaft 1 continues to rotate, a load is applied to each lock portion 9. In the spindle device in which the housing 2 includes a plurality of lock portions 9, the load on each lock portion 9 when the housing 2 is changed from the first state to the second state is reduced as compared with the case where the housing 2 includes only one lock portion 9. obtain. As the number of lock portions 9 increases, the load applied to one lock portion 9 can be reduced.

In the spindle device 100, the lock portion holding portion 10 and the brake portion holding portion 18 are provided as separate bodies, but both may be provided integrally. In other words, the brake portion 17 may be held by the lock portion holding portion 10 together with the lock portion 9. FIG. 8 shows a lock portion holding portion 10 holding the four lock portions 9 and the four brake portions 17.

As shown in FIG. 8, the lock portion holding portion 10 is further provided with a through hole 10f for accommodating the brake portion 17. The through hole 10f may have the same configuration as the through hole 18b of the brake portion holding portion 18. The through hole 10f is provided at a distance from the through hole 10b in the thrust direction, for example. A plurality of brake portions 17 and a plurality of lock portions 9 may be held by one holding portion (lock portion holding portion 10). In the holding portion (lock portion holding portion 10), each of the plurality of through holes 10b provided at intervals in the circumferential direction is each of the plurality of through holes provided at intervals in the circumferential direction. Each of the 10fs may be arranged at a position where they overlap with each other when viewed from the thrust direction at intervals in the thrust direction. Each of the plurality of through holes 10b provided at intervals in the circumferential direction is heavy with each of the plurality of through holes 10f provided at intervals in the circumferential direction when viewed from the thrust direction. It may be arranged in a position where it does not become.

As shown in FIG. 9, the through hole 10f may be provided so as to face the through hole 10b in the radial direction. In other words, at least a part of the contact member 17a of the brake portion 17 may be arranged at a position where it overlaps with the opening 1d of the rotating shaft 1 in the radial direction. It is preferable that the area of the surface of the contact member 17a that can come into contact with the rotating shaft 1 is larger than the opening area of the opening 1d. That is, it is preferable that the area of the tip surface of the contact member 17a is larger than the area of the tip surface of the pin 9a. In this way, the contact member 17a can always come into contact with the rotating shaft 1 when the brake portion 17 is in the fourth state. For example, the width of the contact member 17a in the thrust direction is larger than the width of the opening 1d in the thrust direction. For example, the circumferential width of the contact member 17a is larger than the circumferential width of the opening 1d. Further, the central axis of the pin 9a may be arranged on the same axis as the central axis of the contact member 17a.

In this way, when the lock portion 9 and the brake portion 17 are held by one holding portion (lock portion holding portion 10), one holding portion (lock portion holding portion 10) is replaced by replacing the lock portion 9 and the brake portion 17. The lock portion 9 and the brake portion 17 can be easily replaced. In particular, when the housing 2 includes a plurality of brake portions 17 and a plurality of lock portions 9, one holding portion (lock portion holding portion 10) of the plurality of brake portions 17 and the plurality of lock portions 9 is replaced. By doing so, they can be exchanged together.

In the spindle device 100, the lock portion driving gas and the brake portion driving gas may be supplied through a dedicated path different from the rotation driving gas path and the bearing gas path. The lock portion driving gas and the brake portion driving gas may be supplied through a path branched from at least one of the rotation driving gas path and the bearing gas path.

In the spindle device 100 and the coating device 200, a portion of the flow passage 16 located upstream of the lock portion 9 and a portion of the flow passage 20 located upstream of the brake portion 17 are provided independently of each other. However, these parts may be connected to each other. These portions may be connected, for example, inside the housing 2, or may be connected outside the housing 2, such as inside the spindle holder 41. In other words, the supply of the brake unit driving gas to the flow passage 20 and the lock unit driving gas to the flow passage 16 may be controlled by one control unit. Specifically, the supply of the brake unit driving gas to the flow passage 20 and the supply of the lock unit driving gas to the flow passage 16 can be controlled simultaneously by one control unit. In this case as well, by making the configurations of the brake portion 17 and the flow passage 20 different from the configurations of the lock portion 9 and the flow passage 16, the brake portion 17 before switching from the first state to the second state of the lock portion 9 Switching from the third state to the fourth state can be realized.

The spring constant of the first elastic member 17b is preferably smaller than the spring constant of the second elastic member 9b. In a spindle device in which the supply of the brake unit driving gas to the flow passage 20 and the lock unit driving gas to the flow passage 16 can be controlled by one control unit, the lock unit 9 is switched from the first state to the second state. At this time, it is preferable that the pressures of the brake unit driving gas and the lock unit driving gas supplied to the flow passage 16 and the flow passage 20 are gradually increased (at least two stages).

Specifically, in the first stage, the pressure of the brake unit driving gas and the pressure of the lock unit driving gas supplied to the flow passage 20 and the flow passage 16 by one control unit are set to the first elastic member 17b. Is controlled to a value larger than the elastic force applied to the contact member 17a and smaller than the elastic force applied to the pin 9a by the second elastic member 9b. The first stage is maintained until the rotation of the rotating shaft 1 is decelerated to a predetermined speed or the rotation of the rotating shaft 1 is stopped.

Next, in the second stage, the pressure of the brake unit driving gas and the pressure of the lock unit driving gas supplied to the flow passage 20 and the flow passage 16 by the above-mentioned one control unit are measured by the second elastic member 9b. The value is controlled to be larger than the elastic force applied to the pin 9a.

In this way, even when the timing at which the brake unit drive gas is supplied to the brake unit 17 and the timing at which the lock unit drive gas is supplied to the lock unit 9 are simultaneous, the lock unit 9 is moved from the first state to the second state. The brake unit 17 can be switched from the third state to the fourth state before being switched to the state. The brake unit 17 can sufficiently decelerate the rotation of the rotating shaft 1 before the lock unit 9 is switched from the first state to the second state. Therefore, the rotation of the rotating shaft 1 can be locked without damaging the rotating shaft 1.

In the spindle device 100, the planar shape of the end portion of the shaft portion of the contact member 17a on the inner peripheral side in the radial direction when viewed from the radial direction is circular, but is not limited to this. The planar shape of the end portion of the shaft portion of the contact member 17a on the inner peripheral side in the radial direction may be any shape, and may be elliptical, rectangular, annular, angular, C-shaped, or the like. ..

In the spindle device 100, the end surface of the contact member 17a on the inner peripheral side in the radial direction is a plane perpendicular to the radial direction, but the present invention is not limited to this. As shown in FIG. 10, the end face of the contact member 17a on the inner peripheral side in the radial direction may be a curved surface. In the cross section perpendicular to the thrust direction, the end surface of the contact member 17a on the inner peripheral side in the radial direction may have an arc shape along the outer peripheral surface of the third portion 1c of the rotating shaft 1. Therefore, the contact area between the contact member 17a and the rotating shaft 1 increases as compared with the contact area between the contact member 17a and the rotating shaft 1 shown in FIG. In this way, the brake unit 17 can more effectively decelerate the rotation of the rotating shaft 1.

In the spindle device 100, the brake portion 17 is arranged between the first journal bearing and the second journal bearing in the thrust direction, and the contact member 17a is provided so as to be in contact with the outer peripheral surface of the third portion 1c of the rotating shaft 1. However, it is not limited to this. As shown in FIG. 11, for example, the brake portion 17 is held by the nozzle plate 12, and the contact member 17a is provided so as to be in contact with the thrust plate portion of the rotating shaft 1. In this case, the nozzle plate 12 is provided with a through hole 12d at a position spaced apart from the through hole 12b accommodating the third bearing sleeve 11 in the radial direction. The brake portion 17 is housed inside the through hole 12d. The planar shape of the through hole 12d as viewed from the thrust direction may be any shape, for example, may be circular or may be provided in a C shape. In the latter case, the planar shape of the surface located on the front side of the contact member 17a as viewed from the thrust direction is, for example, C-shaped. Even in this way, the rotation of the rotating shaft 1 can be sufficiently decelerated before the lock portion 9 is switched from the first state to the second state, so that the rotating shaft 1 can be reduced without damaging the rotating shaft 1. The rotation can be locked.

In the spindle device 100, the brake unit 17 is switched from the third state to the fourth state by the contact member 17a receiving the pressure of the brake unit driving gas supplied to the brake unit 17, and the brake unit 17 is supplied to the brake unit 17. The fourth state can be switched to the third state by stopping the supply of the driving gas, but the present invention is not limited to this. As shown in FIG. 12, the brake unit 17 is switched from the fourth state to the third state by the contact member 17a receiving the pressure of the brake unit driving gas supplied to the brake unit 17, and is transferred to the brake unit 17. The third state may be switched to the fourth state by stopping the supply of the brake unit driving gas. In this case, the brake portion 17 has a third elastic member 17d that applies an elastic force to the contact member 17a in the direction toward the rotation axis 1 instead of the first elastic member 17b.

As shown in FIG. 12, the portion of the flow passage 20 located upstream of the brake portion 17 has a rotation shaft 1 inside the through hole 18b accommodating the brake portion 17 with respect to the flange portion of the contact member 17a. It is connected to the space provided on the side. The through hole of the lid portion 17c forms a part of a portion of the flow passage 20 located on the downstream side of the brake portion 17.

As shown in FIG. 12, one end of the third elastic member 17d is connected to the lid portion 17c, and the lid portion 17c restricts the movement toward the outer peripheral side in the radial direction. The other end of the third elastic member 17d is connected to the flange portion of the contact member 17a. As a result, the third elastic member 17d can apply an elastic force directed inward in the radial direction to the contact member 17a. In this case, the brake unit 17 may be held in the third state while receiving the supply of the brake unit driving gas.

In the brake unit 17 shown in FIG. 12, the brake unit driving gas is preferably a part of the rotating shaft driving gas. That is, it is preferable that the portion of the flow passage 20 located on the upstream side of the brake portion 17 is connected to the portion of the flow passage 13 located on the upstream side of the rotary blade 1e of the rotating shaft 1. The supply of the rotating shaft driving gas to the flow passage 13 and the supply of the brake unit driving gas to the flow passage 20 can be controlled simultaneously by one control unit. In this way, while the rotary shaft driving gas is being supplied to the flow passage 13, the brake unit driving gas is continuously supplied to the flow passage 20, and the brake unit 17 is maintained in the third state. When the supply of the rotating shaft driving gas to the flow passage 13 is stopped, the supply of the brake unit driving gas to the flow passage 20 is stopped, and the brake unit 17 is switched from the third state to the fourth state.

In the spindle device 100, the brake portion 17 is maintained in the third state while the rotary shaft 1 is rotationally driven, but the present invention is not limited to this. For example, when the rotating shaft 1 is rotated at a high speed of tens of thousands of rpm or more as in a spindle device for electrostatic coating, the brake unit 17 is substantially in the fourth state while the rotating shaft 1 is rotating at a high speed. It may be controlled by. Here, the fact that the contact member 17a is substantially in the fourth state means that the contact member 17a can come into contact with the rotating shaft 1, but the contact member 17a rotates due to the dynamic pressure effect accompanying the high-speed rotation of the rotating shaft 1. It means that the action of decelerating the rotation of the shaft 1 is hardly working.

The brake unit 17, which is controlled to be substantially in the fourth state while the rotation shaft 1 is rotating at high speed, may have the configuration shown in FIG. 12, for example. The brake portion 17 is provided so as to be able to maintain a state in which the contact member 17a is in contact with the rotating shaft 1 (fourth state) by the elastic force of the third elastic member 17d. The brake unit 17 is switched from the fourth state to the third state by receiving the pressure of the brake unit drive gas supplied to the brake unit 17 by the contact member 17a, and supplies the brake unit drive gas to the brake unit 17. Is stopped to switch from the third state to the fourth state.

Even in this way, for example, when the rotation of the rotary shaft 1 is decelerated when the rotary drive of the rotary shaft 1 is stopped and the action of the dynamic pressure effect is reduced, the contact member 17a of the brake portion 17 is the rotary shaft. It is the fourth state in contact with 1. Therefore, the rotation of the rotating shaft 1 can be decelerated by the brake unit 17.

In the brake portion 17 in which the third elastic member 17d is provided so as to apply an elastic force toward the rotation axis to the contact member 17a, the brake portion 17 is formed by increasing the spring constant of the third elastic member 17d. A stronger braking force can be applied to 1. As shown in FIG. 12, it is preferable that the third elastic member 17d is provided with a force that weakens or cancels the elastic force of the third elastic member 17d while the rotating shaft 1 is rotating at high speed. For example, as shown in FIG. 12, the brake unit driving gas is preferably a part of the rotating shaft driving gas. As a result, while the rotating shaft driving gas is supplied to the flow passage 13, the elasticity of the third elastic member 17d is caused by the brake portion driving gas that is a part of the rotating shaft starting gas supplied to the flow passage 20. A force that weakens or cancels the force can be applied to the third elastic member 17d.

In the spindle device 100, the bearing gas is supplied to the first bearing sleeve 3 and the second bearing sleeve 4 via the flow passage branched from one flow passage 14, but the present invention is not limited to this. The flow path for supplying the bearing gas to the first bearing sleeve 3 and the flow path for supplying the bearing gas to the second bearing sleeve 4 may be configured independently of each other.

Further, in the spindle device 100, a portion not configured as a bearing is arranged between the first journal bearing and the second journal bearing, and as long as a lock portion is arranged in the portion, an arbitrary configuration is provided. Can be equipped. For example, the lock portion holding portion 10 may be provided integrally with the first bearing sleeve 3 and the second bearing sleeve 4.

Although the embodiment of the present invention has been described above, it is possible to modify the above-described embodiment in various ways. Moreover, the scope of the present invention is not limited to the above-described embodiment. The scope of the present invention is indicated by the scope of claims and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

The above embodiments are particularly advantageously applied to spindle devices used in painting devices.

1 Rotating shaft, 1a 1st part, 1b 2nd part, 1c 3rd part, 1d opening, 1e rotary blade, 1f through hole, 2 housing, 3rd bearing sleeve, 3a, 4a, 5a, 6a, 7a, 8a, 10a, 10b, 10c, 10d, 10f, 11a, 12b, 12d, 18a, 18b, 18d through hole, 4th bearing sleeve, 5th housing assembly, 6th housing assembly, 7th first cover, 8 2nd cover, 9 lock part, 9a pin, 9b 2nd elastic member, 9c maintenance tap, 9d lid part, 10 lock part holding part, 11 3rd bearing sleeve, 12 nozzle plate, 12a front facing surface, 12c rotation Sensor insertion port, 13, 14, 15, 16, 20 Flow passage, 17 Brake section, 17a contact member, 17b 1st elastic member, 17c lid section, 17d 3rd elastic member, 18 Brake section holding section, 18e recess, 19 O-ring, 40 cups, 41 spindle holder, 41a receiving part, 42 turbine gas air supply port, 43 turbine gas exhaust port, 44, 45 bearing gas air supply port, 46 lock gas air supply port, 47 lock gas exhaust port, 48 Paint supply port, 49 insertion port, 50 paint injection nozzle, 51 rotation sensor, 52 brake gas air supply port, 100 spindle device, 200 painting device.

Claims (7)

With the housing
With a rotating shaft located inside the housing
One or more openings are arranged on the outer peripheral surface of the rotating shaft.
The one or more openings have a pair of inner walls facing each other in the direction of rotation of the axis of rotation.
The housing includes one or more brakes and one or more locks.
The one or more brake portions have contact members that can come into contact with the rotating shaft.
The one or more lock portions have a fixing member that can be arranged inside the one or more openings, and the first state in which the fixing member is arranged outside the one or more openings. , The fixing member is provided so as to be switchable from a second state in which the fixing member is arranged inside the one or more openings.
The axis of rotation includes a first portion, a second portion, and a third portion located between the first portion and the second portion in the thrust direction.
The one or more openings are arranged on the outer peripheral surface of the third portion.
The housing is
A first journal bearing portion facing the first portion in the radial direction and supporting the rotation axis, and a first journal bearing portion.
Further including a second journal bearing portion that faces the second portion in the radial direction and pivotally supports the rotation axis.
Said one or more brake unit and the one or more lock portions, wherein is arranged between the thrust direction as the first journal bearing portion and the second journal bearing part, spindles device. The one or more brake portions are provided so as to be able to switch between a third state in which the contact member is not in contact with the rotating shaft and a fourth state in which the contact member is in contact with the rotating shaft. , The spindle device according to claim 1. The one or more brake portions are provided so that the contact member can switch from the third state to the fourth state by receiving the pressure of the brake portion driving gas.
The spindle according to claim 2 , wherein the one or more lock portions are provided so that the fixing member can be switched from the first state to the second state by receiving the pressure of the lock portion driving gas. apparatus. The housing has a first flow passage for supplying the brake portion driving gas to the one or more brake portions, and a first flow passage for supplying the lock portion driving gas to the one or more lock portions. There is a second-class passage,
A portion of the first flow passage located upstream of the one or more brake portions is connected to a portion of the second flow passage located upstream of the one or more lock portions.
The one or more brake portions further include a first elastic member that applies an elastic force to the contact member in a direction away from the portion of the rotation shaft that the contact member contacts in the fourth state.
The one or more lock portions further include a second elastic member that applies an elastic force to the fixing member in a direction away from the portion of the rotation shaft that the fixing member contacts in the second state.
The spindle device according to claim 3 , wherein the spring constant of the first elastic member is smaller than the spring constant of the second elastic member. The one or more brake portions further include a third elastic member that applies an elastic force to the contact member in a direction toward the rotation axis.
The spindle device according to claim 1, wherein the one or more brake portions are provided so as to be able to maintain a state in which the contact member is in contact with the rotating shaft by the elastic force of the third elastic member. The one or more brake portions are provided so as to be able to switch between a third state in which the contact member is not in contact with the rotating shaft and a fourth state in which the contact member is in contact with the rotating shaft. ,
The rotary shaft includes a plurality of rotary blades, and is rotationally driven by supplying a driving gas to the plurality of rotary blades.
The housing is provided with a third flow passage for supplying the driving gas to the one or more brake portions.
The one or more brake portions are provided so that the contact member can switch from the fourth state to the third state by receiving the pressure of the driving gas supplied from the third flow passage. , The spindle device according to claim 5. The housing further seen including a plurality of said brake portion and a holding portion which holds the plurality of the brake unit and the one or more lock portions,
The spindle device according to any one of claims 1 to 6 , wherein the holding portion is provided interchangeably with respect to the first journal bearing portion and the second journal bearing portion.

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