Spindle device of a machine tool and machine tool

Abstract

The present application provides a spindle device of a machine tool and a machine tool. The spindle device of the machine tool includes a rotating body having a rear end portion and a front end portion holding a tool, a bearing having an inner ring and an outer ring, a housing supporting the rotating body to be rotatable around a first axis by means of the bearing, a supply flow passage supplying a mixed fluid containing oil and air to the bearing, and a recovery flow passage recovering the oil that has passed through the bearing. The rotating body has a first portion supporting the inner ring and having a first outer circumferential surface, a second portion having a second outer circumferential surface with a smaller diameter than the first outer circumferential surface and being arranged on a first direction side further than the first portion, and a step surface connecting the first outer circumferential surface and the second outer circumferential surface. The housing has a third portion supporting the outer ring, and a fourth portion defining an annular accommodation space receiving the oil from a first gap between the first portion and the third portion. The fourth portion has an opening portion guiding the oil from the annular accommodation space to the recovery flow passage, and an annular protrusion protruding in a direction away from the first axis and facing both the step surface and the annular accommodation space.

Description

TECHNICAL FIELD

[0001] The present application relates to a spindle device of a machine tool and a machine tool. BACKGROUND

[0002] A lubricating device of a spindle of a machine tool is known.

[0003] As related art, Patent Literature 1 discloses a lubricating device of a vertical spindle of a machine tool. The lubricating device described in Patent Literature 1 has a vertical spindle that is rotationally supported in a spindle housing by means of a rolling bearing, a nozzle device that sprays lubricating oil to the rolling bearing, and an oil recovery passage that recovers the lubricating oil supplied to the rolling bearing via an oil discharge passage formed in the spindle housing. Further, the lubricating device described in Patent Literature 1 has a labyrinth device that is provided at a position below the rolling bearing and forms an accumulation chamber of the lubricating oil, an air seal device that is provided below the labyrinth device and supplies pressurized air for preventing oil leakage caused by a gap between the spindle housing and the vertical spindle, and a mechanical seal device that is sandwiched between the labyrinth device and the air seal device and prevents oil leakage in conjunction with the supply of the pressurized air.

[0004] Patent Literature 1: Japanese Patent Application Laid-Open No. 63-062638 SUMMARY

[0005] An object of the present application is to provide a spindle device of a machine tool and a machine tool that suppresses leakage of oil from a gap between a rotating body and a housing to the outside of the spindle device.

[0006] The spindle device of a machine tool in some embodiments has a rotating body having a rear end portion and a front end portion that holds a tool, a bearing having an inner ring and an outer ring, a housing that rotationally supports the rotating body about a first axis by means of the bearing, a supply flow passage that supplies a mixed fluid containing oil and air to the bearing, and a recovery flow passage that recovers the oil that has passed through the bearing. The rotating body has a first portion that supports the inner ring and has a first outer peripheral surface, a second portion that has a second outer peripheral surface having a smaller diameter than the first outer peripheral surface and is disposed on a first direction side more than the first portion when a direction from the rear end portion toward the front end portion is defined as the first direction, and a step surface that connects the first outer peripheral surface and the second outer peripheral surface. The housing has a third portion that supports the outer ring and a fourth portion that defines an annular accommodation space that receives the oil from a first gap between the first portion and the third portion. The fourth portion has an opening portion that guides the oil from the annular accommodation space to the recovery flow passage and an annular protrusion that faces both the step surface and the annular accommodation space and protrudes in a direction away from the first axis.

[0007] The machine tool in some embodiments has a machining head having a rotating body, a plurality of bearings including a first bearing, a housing that supports the rotating body to be rotatable by means of the plurality of bearings, and a first rotation drive device that rotates the rotating body around a first shaft, a lubricating device that supplies a mixed fluid containing oil and air to the first bearing by means of a supply flow passage, a recovery device that recovers at least a part of the oil that has passed through the first bearing by means of a recovery flow passage, a workpiece support device that supports a workpiece, a moving device that relatively moves the machining head with respect to the workpiece support device, and a control device that controls at least the first rotation drive device and the moving device. The rotating body has a rear end portion, a front end portion that holds a tool, a first portion that supports an inner ring of the first bearing and has a first outer peripheral surface, a second portion that has a second outer peripheral surface having a smaller diameter than the first outer peripheral surface and is disposed on a side of a first direction more than the first portion when a direction from the rear end portion toward the front end portion is defined as the first direction, and a step surface that connects the first outer peripheral surface and the second outer peripheral surface. The housing has a third portion that supports an outer ring of the first bearing, and a fourth portion that defines an annular accommodation space that receives the oil from a first gap between the first portion and the third portion. The fourth portion has an opening portion that guides the oil from the annular accommodation space to the recovery flow passage, and an annular protrusion that faces both the step surface and the annular accommodation space and protrudes in a direction away from the first shaft.

[0008] According to the present application, it is possible to provide a machine tool main shaft device and a machine tool that suppresses the leakage of oil from a gap between a rotating body and a housing to the outside of a main shaft device. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 FIG. 1 is a schematic cross-sectional view that schematically represents a machine tool main shaft device in a first embodiment.

[0010] Figure 2 FIG. 2 is an enlarged view of a portion enclosed by a quadrangle A in single-dot chain lines in FIG. 1. Figure 1

[0011] Figure 3 FIG. 3 is a schematic cross-sectional view that schematically represents a portion of the machine tool main shaft device in the first embodiment.

[0012] Figure 4 FIG. 4 is a schematic cross-sectional view that schematically represents a portion of the machine tool main shaft device in the first embodiment.

[0013] Figure 5 FIG. 5 is a schematic cross-sectional view that schematically represents a portion of the machine tool main shaft device in the first embodiment.

[0014] Figure 6 ​is a schematic cross-sectional view that schematically shows a part of the spindle device of the machine tool in the first embodiment.

[0015] Figure 7 is a schematic cross-sectional view that schematically shows a part of the spindle device of the machine tool in the modified example of the first embodiment.

[0016] Figure 8 is an enlarged view of the part indicated by the single-dot chain line circle B in Figure 6

[0017] Figure 9 is the C-C arrow cross-sectional view in Figure 6

[0018] Figure 10 is a view that schematically shows a part of the spindle device of the machine tool in the first embodiment.

[0019] Figure 11 is a schematic cross-sectional view that schematically shows a part of the spindle device of the machine tool in the first embodiment.

[0020] Figure 12 is a schematic cross-sectional view that schematically shows a part of the spindle device of the machine tool in the second modified example of the first embodiment.

[0021] Figure 13 is a schematic cross-sectional view that schematically shows a part of the spindle device of the machine tool in the first embodiment.

[0022] Figure 14 is a schematic cross-sectional view that schematically shows a part of the spindle device of the machine tool in the second embodiment.

[0023] Figure 15 is an enlarged view of the part enclosed by the single-dot chain line quadrangle D in Figure 14

[0024] Figure 16 is a schematic cross-sectional view that schematically shows a part of the spindle device of the machine tool in the second embodiment.

[0025] Figure 17 is the E-E arrow cross-sectional view in Figure 16

[0026] Figure 18 is an enlarged view of the part indicated by the single-dot chain line circle F in Figure 16

[0027] Figure 19 is a schematic cross-sectional view that schematically shows a part of the spindle device of the machine tool in the second embodiment.

[0028] Figure 20 ​​​​​is a schematic cross-sectional view that schematically represents a portion of the spindle device of the machine tool in the second embodiment.

[0029] Figure 21 is a schematic cross-sectional view that schematically represents a portion of the spindle device of the machine tool in the modification of the second embodiment.

[0030] Figure 22 is a schematic cross-sectional view that schematically represents the spindle device of the machine tool in the second embodiment.

[0031] Figure 23 is a schematic cross-sectional view that schematically represents a portion of the spindle device of the machine tool in the second embodiment.

[0032] Figure 24 is a schematic cross-sectional view that schematically represents a portion of the spindle device of the machine tool in the second embodiment.

[0033] Figure 25 is a schematic perspective view that schematically represents an example of the machine tool in the third embodiment.

[0034] Figure 26 is a schematic perspective view that schematically represents another example of the machine tool in the third embodiment.

[0035] Figure 27 is a diagram that schematically represents a case where the control device can control a plurality of control target devices.

[0036] Figure 28 is a schematic cross-sectional view that schematically represents a modification related to the first portion and the second portion of the rotary body.

[0037] Figure 29 is a schematic cross-sectional view that schematically represents a first modification related to the first gap.

[0038] Figure 30 is a schematic cross-sectional view that schematically represents a second modification related to the first gap. DETAILED DESCRIPTION

[0039] The spindle device 1 of the machine tool and the machine tool 100 in the embodiments will be described below with reference to the drawings. In addition, in the description of the embodiments below, identical reference numerals are assigned to portions and members having the same function, and repeated description of the portions and members assigned with the identical reference numerals is omitted.

[0040] (Definition of Directions)

[0041] In the present specification, the direction from the rear end portion 22 of the rotary body 2 toward the front end portion 24 of the rotary body 2 is defined as a "first direction DR1", and the direction opposite to the first direction DR1 is defined as a "second direction DR2".

[0042] In the present specification, a direction close to the first axis AX1 that is a rotation axis of the rotation body 2 is defined as an "in-diameter direction DR3" or "inward". Further, a direction away from the first axis AX1 that is a rotation axis of the rotation body 2 is defined as an "out-diameter direction DR4" or "outward".

[0043] A direction from the rear end portion 22 of the rotation body 2 toward the front end portion 24 of the rotation body 2 is, for example, downward or lateral. In a case where the attitude of the spindle device 1 is changeable, the direction from the rear end portion 22 of the rotation body 2 toward the front end portion 24 of the rotation body 2 changes according to the attitude change of the spindle device 1. In the present specification, regardless of the actual attitude of the spindle device 1, the direction from the rear end portion 22 of the rotation body 2 toward the front end portion 24 of the rotation body is referred to as a "downward direction", and the direction from the front end portion 24 of the rotation body 2 toward the rear end portion 22 of the rotation body is referred to as an "upward direction". Further, in the present specification, regardless of the actual attitude of the spindle device 1, a face on the first direction DR1 side is referred to as a "lower surface", and a face on the second direction DR2 side is referred to as an "upper surface".

[0044] (First Embodiment)

[0045] Reference Figures 1 to 13 The spindle device 1A of the machine tool in the first embodiment will be described. Figure 1 is a schematic cross-sectional view that schematically represents the spindle device 1A of the machine tool in the first embodiment. Figure 2 is an enlarged view of a portion enclosed by a quadrangle A in Figure 1 in a single-dot chain line.

[0046] Figure 3 is a schematic cross-sectional view that schematically represents a portion of the spindle device 1A of the machine tool in the first embodiment. Figure 4 and Figure 5 is a schematic cross-sectional view that schematically represents a portion of the spindle device 1A of the machine tool in the first embodiment. In addition, Figure 5 represents half of the portion shown in Figure 4 . Figure 6 is a schematic cross-sectional view that schematically represents a portion of the spindle device 1A of the machine tool in the first embodiment. Figure 7 is a schematic cross-sectional view that schematically represents a portion of the spindle device 1A of the machine tool in the first embodiment. Figure 8 is an enlarged view of a portion represented by a circle B in Figure 6 in a single-dot chain line. Figure 9 is a C-C arrow cross-sectional view in Figure 6 . Figure 10 is a view that schematically represents a portion of the spindle device 1A of the machine tool in the first embodiment. Figure 11is a schematic cross-sectional view that schematically represents a portion of the spindle device 1A of the machine tool in the first embodiment. Figure 12 is a schematic cross-sectional view that schematically represents a portion of the spindle device 1A of the machine tool in the second modification of the first embodiment. Figure 13 is a schematic cross-sectional view that schematically represents a portion of the spindle device 1A of the machine tool in the first embodiment.

[0047] As Figure 1 illustrated, the spindle device 1A of the machine tool in the first embodiment is provided with the rotating body 2, the bearing 3, the housing 4, the supply flow passage 66, and the recovery flow passage 71.

[0048] In Figure 1 the example described, the rotating body 2 is a rotating shaft 20. The rotating body 2 is rotatable about the first axis AX1. The rotating body 2 (more specifically, the rotating shaft 20) has a rear end portion 22 and a front end portion 24 that holds a tool T. In addition, sometimes a tool holder HD that holds the tool T is installed at the front end portion 24. In this case, the tool T is held by the front end portion 24 via the tool holder HD. Therefore, in the present specification, the "front end portion 24 that holds a tool" includes both the front end portion 24 that directly holds the tool T and the front end portion 24 that holds the tool T via the tool holder HD. In other words, in the present specification, the front end portion 24 can be configured to directly hold the tool T or can be configured to hold the tool T via the tool holder HD.

[0049] The housing 4 supports the rotating body 2 so as to be rotatable about the first axis AX1 via the bearing 3. In Figure 1 the example described, the housing 4 is configured by an assembly of a plurality of members.

[0050] In Figure 1 the example described, the spindle device 1A is provided with the bearing 3 (for example, the first bearing 3a). As Figure 2 illustrated, the bearing 3 (for example, the first bearing 3a) has an inner ring 31 and an outer ring 32. In addition, the bearing 3 (for example, the first bearing 3a) has a rolling body 33 that is disposed between the inner ring 31 and the outer ring 32.

[0051] The supply flow passage 66 supplies a mixed fluid containing oil and air to the bearing 3 (for example, the first bearing 3a). Sometimes, this mixed fluid is also referred to as an oil gas. In the oil gas, the oil is transported by the air. In other words, in the oil gas, the air functions as a transport fluid that transports the oil. More specifically, by supplying the oil gas to the bearing 3 (for example, the first bearing 3a), a small amount of oil is continuously supplied to the bearing 3 (for example, the first bearing 3a) using the flow of compressed air.

[0052] The recovery flow passage 71 recovers at least a portion of the oil E that has passed through the bearing 3 (e.g., the first bearing 3a). The recovery flow passage 71 can also recover substantially all of the oil E that has passed through the first bearing 3a. Additionally, the recovery flow passage 71 can also recover at least a portion of the air that has passed through the bearing 3.

[0053] As Figure 2 illustrated, the rotating body 2 (more specifically, the rotating shaft 20) has a first portion 25, a second portion 26, and a step face 25a.

[0054] The first portion 25 supports the inner ring 31a of the bearing 3 (e.g., the first bearing 3a). The first portion 25 has a first outer circumferential face 25u.

[0055] The second portion 26 has a second outer circumferential face 26u that is smaller in diameter than the first outer circumferential face 25u. In other words, the second outer circumferential face 26u of the second portion 26 is smaller in diameter than the first outer circumferential face 25u of the first portion 25. The second portion 26 is disposed on the first direction DR1 side more than the first portion 25.

[0056] The step face 25a connects the first outer circumferential face 25u of the first portion 25 and the second outer circumferential face 26u of the second portion 26.

[0057] As Figure 2 illustrated, the housing 4 has a third portion 41 and a fourth portion 42.

[0058] The third portion 41 supports the outer ring 32a of the bearing 3 (e.g., the first bearing 3a). A first gap G1 is formed between the first portion 25 of the rotating body 2 and the third portion 41. In Figure 2 In the example described, the oil E that has passed through the bearing 3 (e.g., the first bearing 3a) is present in the first gap G1. In the first gap G1, the oil E can be present in an oil gas state, can be present in an oil mist state, and can be present in a liquid oil state.

[0059] The fourth portion 42 defines an annular accommodation space SP that receives the oil E from the first gap G1. In the annular accommodation space SP, the oil E can be present in an oil gas state, can be present in an oil mist state, and can be present in a liquid oil state.

[0060] In Figure 2 the example described, the fourth portion 42 has an opening portion 45 that guides the oil E from the annular accommodation space SP to the recovery flow passage 71, and an annular protrusion 441.

[0061] The annular protrusion 441 faces both the step face 25a and the annular accommodation space SP. In Figure 2In the example described, the second direction DR2-side surface (hereinafter referred to as "upper surface 441a") of the plurality of surfaces of the annular protrusion 441 faces the step surface 25a. Further, the first direction DR1-side surface (hereinafter referred to as "lower surface 441d") of the plurality of surfaces of the annular protrusion 441 faces the annular accommodation space SP.

[0062] The annular protrusion 441 protrudes in a direction away from the first axis AX1. Therefore, it can be said that the annular protrusion 441 is an outward annular protrusion.

[0063] In the spindle device 1A of the machine tool of the first embodiment, the housing 4 has the annular accommodation space SP. Therefore, the oil E that has passed through the bearing 3 can be temporarily accommodated in the annular accommodation space SP. The oil E in the annular accommodation space SP is recovered by the recovery flow passage 71. In this way, the leakage of the oil from the gap between the rotating body 2 and the housing 4 to the outside of the spindle device 1A of the machine tool is suppressed.

[0064] Further, in the first embodiment, the annular protrusion 441 prevents or suppresses the backflow of the oil E that has entered the annular accommodation space SP to the second direction DR2 beyond the annular protrusion 441. Therefore, in the first embodiment, the leakage of the oil from the gap between the rotating body 2 and the housing 4 to the outside of the spindle device 1A of the machine tool can be more effectively suppressed.

[0065] For example, a case in which it is not desirable that the oil adhere to a workpiece that is machined by the tool T is assumed. More specifically, a case in which a workpiece composed of carbon material, for which an adverse situation occurs if the oil adheres, is machined is assumed. In this case, the first embodiment is useful.

[0066] Further, when a resin material or the like is machined using the tool T, dry machining is sometimes adopted. In the first embodiment, the leakage of the oil to the outside of the spindle device 1A of the machine tool is suppressed, and the adhesion of the oil to a workpiece (for example, a resin material or the like) is effectively suppressed. Therefore, the first embodiment is also useful in the case of utilizing dry machining.

[0067] In the first embodiment, the leakage of the oil to the surroundings of the spindle device 1A of the machine tool is suppressed, and the contamination of the work environment by the oil is prevented or suppressed. Therefore, the work environment is improved, and the load on the environment is reduced. Further, in the case where a cooling medium is used in the machining of a workpiece (in other words, in the case of non-dry machining), the leakage of the oil is also suppressed in the first embodiment, and the mixing of the oil into the cooling medium is suppressed. Therefore, even in this case, the load on the environment can be reduced.

[0068] (Any Additional Structures)

[0069] Next, the first embodiment will be described in detail with reference to Figures 1 to 13 Any additional structures that can be employed in the spindle device 1A of the machine tool of the first embodiment will be described.

[0070] (circular accommodation space SP)

[0071] In Figure 3 , in order to facilitate grasping the shape of the circular accommodation space SP, a shadow composed of dots is applied to the circular accommodation space SP. In Figure 3 the example described, the circular accommodation space SP has a shape in which a first rectangular shape SH1 and a second rectangular shape SH2 larger than the first rectangular shape are combined on a longitudinal section passing through the first axis AX1. Alternatively, the circular accommodation space SP can have a triangular shape, a trapezoidal shape, a pentagonal shape, or another shape on a longitudinal section passing through the first axis AX1.

[0072] In Figure 3 , the first gap G1 and the circular accommodation space SP are disposed on a straight line LN parallel to the first axis AX1. In this case, oil E present in the first gap G1 can be smoothly guided to the circular accommodation space SP.

[0073] (circular protruding portion 44)

[0074] In Figures 4 to 6 , the fourth portion 42 has a circular protruding portion 44 that protrudes inward toward the first axis AX1. In addition, in Figure 5 and Figure 6 , in order to facilitate grasping the shape of the circular protruding portion 44, a shadow composed of dots is applied to the circular protruding portion 44.

[0075] In Figure 6 , the circular protruding portion 44 has the aforementioned circular protrusion 441 that protrudes outward, a first face 44a that faces the step face 25a, and a second face 44b that faces the outer peripheral face of the second portion 26 of the rotating body 2 (in other words, the second outer peripheral face 26u).

[0076] The first face 44a is a face on the second direction DR2 side of the circular protruding portion 44. The first face 44a is, for example, a circular face perpendicular to the first axis AX1. Alternatively, the first face 44a can be a face inclined with respect to the first axis AX1, or a stepped face (refer to Figure 7 ).

[0077] In Figure 8 , at least a portion of the first face 44a is a surface of the circular protrusion 441 that protrudes outward. More specifically, at least a portion of the first face 44a is composed of a face on the second direction DR2 side of the circular protrusion 441 (in other words, an upper surface 441a of the circular protrusion 441).

[0078] In Figure 8In the recorded example, a second gap G2, which is in fluid communication with the first gap G1, is formed between the first surface 44a and the stepped surface 25a. Figure 8 In the documented example, the second gap G2 is located further to the second direction DR2 than the annular protrusion 441. Furthermore, in Figure 8 In the example described, a third gap G3, which is in fluid communication with the second gap G2, is formed between the second surface 44b and the second outer peripheral surface 26u of the rotating body 2.

[0079] Consider the path from the first clearance G1 to the outside of the machine tool's spindle assembly 1A. This path could be a cause of oil leakage. Figure 8 In the described example, a second gap G2 exists between the first surface 44a and the stepped surface 25a on the path from the first gap G1 to the outside of the machine tool spindle assembly 1A. Therefore, the presence of the second gap G2 can prevent oil leakage to the outside of the machine tool spindle assembly 1A via the aforementioned path.

[0080] exist Figure 8 In the described example, the extending direction of the first gap G1 is different from the extending direction of the second gap G2. Therefore, it is possible to prevent oil in the first gap G1 from moving towards the second gap G2. For example, it is possible to prevent oil moving downwards from the first gap G1 from entering the second gap G2. Figure 8 In the example described, the extension direction of the first gap G1 is the first direction DR1, and the extension direction of the second gap G2 is the radial direction DR3 (more specifically, the direction perpendicular to and toward the first axis AX1).

[0081] like Figure 9 As illustrated, the difference between the radius RD1 of the outer periphery e1 of the first surface 44a and the radius RD2 of the inner periphery e2 of the first surface 44a is defined as the first width W1. The first width W1 is, for example, 5 mm or more. By making the first width W1 sufficiently large, oil entering the second gap G2 is prevented or suppressed from reaching the third gap G3 (see reference). Figure 8 This can further and more effectively suppress oil leakage to the spindle assembly 1A of the machine tool.

[0082] exist Figure 8 In the described example, the annular containment space SP is positioned further along the first direction DR1 than the second gap G2. In this case, the possibility of oil contained in the annular containment space SP entering the second gap G2 due to backflow can be further effectively reduced.

[0083] exist Figure 8 In the example described, the spindle assembly 1A of the machine tool has a region SE at the intersection of a first gap G1, a second gap G2 and an annular receiving space SP, and the second gap G2 is connected to the first gap G1 via this region SE.

[0084] In Figure 8 the example described, the third gap G3 communicates with the second gap G2 by means of the corner portion CN. In addition, the extension direction of the third gap G3 is different from the extension direction of the second gap G2. In Figure 8 the example described, the extension direction of the third gap G3 is the first direction DR1, and the extension direction of the second gap G2 is the radial direction DR3 (more specifically, a direction perpendicular to the first axis AX1 and toward the first axis AX1).

[0085] The second face 44b is a cylindrical face with the first axis AX1 as the center axis. As Figure 8 illustrated, the length of the second face 44b in the direction along the first axis AX1 is defined as a first length L1. The first length L1 can be greater than the first width W1, can be less than the first width W1, or can be equal to the first width W1. The first length L1 can also be 0.5 times or more and 5 times or less of the first width W1.

[0086] In Figure 10 the example described, the annular protrusion portion 44 has a first annular groove V1 that faces the annular accommodation space SP and is recessed in the radial direction DR3. In Figure 10 the example described, in order to facilitate grasping the shape of the first annular groove V1, the portion other than the first annular groove V1 is indicated by a broken line, and the first annular groove V1 is indicated by a solid line. The first annular groove V1 prevents or suppresses backflow of oil in the annular accommodation space SP toward the first gap G1 or the second gap G2.

[0087] In Figure 10 the example described, the first annular groove V1 is composed of three faces (more specifically, two faces 443d, 444d perpendicular to the first axis AX1, and a face 445d connecting the two faces). In Figure 10 the example described, the first annular groove V1 has a substantially C shape in a longitudinal section passing through the first axis AX1. Alternatively, the first annular groove V1 can also be composed of two faces. In this case, the first annular groove V1 can also have a substantially V shape in a longitudinal section passing through the first axis AX1.

[0088] In Figure 10 the example described, a portion of the surface of the first annular groove V1 is the surface of the annular protrusion 441. More specifically, the portion of the surface of the first annular groove V1 is composed of the face of the annular protrusion 441 on the first direction DR1 side (more specifically, the lower surface 441d of the annular protrusion 441).

[0089] In Figure 10In the example described, the annular protrusion 44 has a third face 44f that constitutes a part of the end face 4f on the first direction DR1 side of the housing 4. The third face 44f can be a face perpendicular to the first axis AX1, or can be a face slightly inclined with respect to the first axis AX1.

[0090] (Annular protrusion 441)

[0091] In Figure 11 In the example described, the annular protrusion 441 functions as a recovery member that suppresses return of oil entering the annular accommodation space SP to the first gap G1 or the second gap G2.

[0092] As Figure 11 illustrated, the distance between the outermost edge e3 of the stepped face 25a of the rotating body 2 and the first axis AX1 is defined as a first distance LT1, and the distance between the outermost edge 441e of the annular protrusion 441 and the first axis AX1 is defined as a second distance LT2. In Figure 11 In the example described, the second distance LT2 is equal to the first distance LT1. Alternatively, as Figure 12 illustrated, the second distance LT2 can be smaller than the first distance LT1.

[0093] In the case where the above-described second distance LT2 is equal to or smaller than the above-described first distance LT1, it is possible to prevent or suppress oil E from the first gap G1 from colliding with the annular protrusion 441 toward the first direction DR1. Therefore, oil E from the first gap G1 is less likely to enter the gap between the stepped face 25a and the annular protrusion 441 (or the second gap G2 between the stepped face 25a and the first face 44a) toward the first direction DR1.

[0094] In Figure 13 In the example described, the annular protrusion 441 has an upper face 441a, an outer side face 441c, and a lower face 441d.

[0095] The upper face 441a is an annular face facing the stepped face 25a of the rotating body 2. The upper face 441a can be perpendicular to the first axis AX1, or can be inclined with respect to a face perpendicular to the first axis AX1.

[0096] In Figure 13 In the example described, the outer side face 441c faces the annular accommodation space SP. On a longitudinal section passing through the first axis AX1, the outer side face 441c is parallel to the first axis AX1. Alternatively, on a longitudinal section passing through the first axis AX1, the outer side face 441c can be inclined with respect to the first axis AX1.

[0097] In Figure 13In the example shown, the lower surface 441d is a ring-shaped surface facing the ring-shaped accommodation space SP. The lower surface 441d can be perpendicular to the first axis AX1, or can be inclined with respect to a surface perpendicular to the first axis AX1.

[0098] (Second Embodiment)

[0099] Reference Figures 14 to 24 The spindle device 1B of the machine tool in the second embodiment will be described. Figure 14 is a schematic cross-sectional view that schematically shows the spindle device 1B of the machine tool in the second embodiment. Figure 15 is an enlarged view of a portion enclosed by a quadrangle D in Figure 14 with a single-dot chain line. Figure 16 is a schematic cross-sectional view that schematically shows a portion of the spindle device 1B of the machine tool in the second embodiment. Figure 17 is an E-E arrow cross-sectional view in Figure 16 . Figure 18 is an enlarged view of a portion indicated by a circle F in Figure 16 with a single-dot chain line. Figure 19 and Figure 20 are schematic cross-sectional views that schematically show a portion of the spindle device 1B of the machine tool in the second embodiment. Figure 21 is a schematic cross-sectional view that schematically shows a portion of the spindle device 1B of the machine tool in a modification of the second embodiment. Figure 22 is a schematic cross-sectional view that schematically shows the spindle device 1B of the machine tool in the second embodiment. Figure 23 and Figure 24 are schematic cross-sectional views that schematically show a portion of the spindle device 1B of the machine tool in the second embodiment.

[0100] In the second embodiment, description will be made focusing on points different from those of the first embodiment. On the other hand, in the second embodiment, repeated description of matters already described in the first embodiment will be omitted. Therefore, in the second embodiment, even if not explicitly described, matters already described in the first embodiment can of course be applied to the second embodiment. Conversely, all matters described in the second embodiment can also be applied to the first embodiment.

[0101] As Figure 14 and Figure 15As illustrated, the spindle assembly 1B of the machine tool in the second embodiment includes: (1) a rotating body 2 (more specifically, a rotating shaft 20) having a rear end 22 and a front end 24 for holding the tool; (2) a bearing 3 (more specifically, a first bearing 3a) having an inner ring 31a and an outer ring 32a; (3) a housing 4 supporting the rotating body 2 for rotation about the first shaft AX1 by means of the bearing 3 (more specifically, by means of a plurality of bearings including the first bearing 3a); (4) a supply channel 66 for supplying a mixed fluid containing oil and air to the bearing 3 (more specifically, the first bearing 3a); and (5) a recovery channel 71 for recovering the oil that has passed through the bearing 3 (more specifically, the first bearing 3a).

[0102] like Figure 15 As illustrated, the rotating body 2 (more specifically, the rotating shaft 20) includes a first portion 25 that supports the inner ring 31a and has a first outer peripheral surface 25u. Furthermore, the rotating body 2 (more specifically, the rotating shaft 20) has a second portion 26, which has a second outer peripheral surface 26u with a smaller diameter than the first outer peripheral surface 25u and is positioned further towards the first direction DR1 than the first portion 25. Moreover, the rotating body 2 (more specifically, the rotating shaft 20) has a stepped surface 25a connecting the first outer peripheral surface 25u and the second outer peripheral surface 26u.

[0103] like Figure 15 As illustrated, the housing 4 has a third portion 41 supporting the outer ring 32a, and a fourth portion 42 defining an annular receiving space SP that receives oil E from the first gap G1 between the first portion 25 and the third portion 41. Furthermore, the fourth portion 42 has an opening 45 guiding oil E from the annular receiving space SP to the recovery channel 71, and an annular protrusion 441 facing both the stepped surface 25a and the annular receiving space SP and protruding in a direction away from the first axis AX1.

[0104] Therefore, the spindle assembly 1B of the machine tool in the second embodiment achieves the same effect as the spindle assembly 1A of the machine tool in the first embodiment.

[0105] (arbitrarily added structures)

[0106] Next, refer to Figures 14 to 24 Any additional structures that can be used in the spindle assembly 1B of the machine tool in the second embodiment (or the spindle assembly 1A of the machine tool in the first embodiment described above) will be described.

[0107] (Circular Containment Space SP)

[0108] exist Figure 15 In order to facilitate understanding the shape of the annular containment space SP, a shadow composed of dots is applied to the annular containment space SP. For example... Figure 15As exemplified, the annular accommodation space SP can also have a shape in which the area of a cross section orthogonal to the first axis AX1 continuously or stepwise increases toward the first direction DR1.

[0109] (Ring-shaped protrusion 44)

[0110] In Figure 16 and Figure 17 In the example described, the fourth portion 42 has a ring-shaped protrusion 44 that protrudes inward toward the first axis AX1. Also, in Figure 16 In order to facilitate grasping the shape of the ring-shaped protrusion 44, the ring-shaped protrusion 44 is shaded by dots.

[0111] In Figure 18 In the example described, the ring-shaped protrusion 44 has the aforementioned ring-shaped protrusion 441 that protrudes outward, a first face 44a that faces the step face 25a of the rotating body 2, and a second face 44b that faces the second outer circumferential face 26u of the rotating body 2.

[0112] In Figure 18 In the example described, at least a portion of the first face 44a is a surface of the ring-shaped protrusion 441 that protrudes outward. More specifically, at least a portion of the first face 44a is constituted by the upper face 441a of the ring-shaped protrusion 441.

[0113] In Figure 18 In the example described, a second gap G2 that is in fluid communication with the first gap G1 is formed between the first face 44a and the step face 25a. In Figure 18 In the example described, the second gap G2 communicates with the first gap G1 by way of the annular accommodation space SP. The second gap G2 is located more on the second direction DR2 side than the ring-shaped protrusion 441. In Figure 18 In the example described, a third gap G3 that is in fluid communication with the second gap G2 is formed between the second face 44b and the second outer circumferential face 26u of the rotating body 2.

[0114] In Figure 18 In the example described, the extension direction of the first gap G1 is different from the extension direction of the second gap G2. Thus, it is possible to suppress the oil in the first gap G1 from heading toward the second gap G2. In Figure 18 In the example described, the extension direction of the first gap G1 is the first direction DR1, and the extension direction of the second gap G2 is the radial direction DR3 (more specifically, a direction that is orthogonal to the first axis AX1 and that is toward the first axis AX1).

[0115] In Figure 18In the example described, the annular protrusion 44 has a first annular groove V1 that faces the annular accommodation space SP and is recessed in the radial inner direction DR3. The first annular groove V1 prevents or suppresses backflow of oil in the annular accommodation space SP toward the second gap G2.

[0116] In Figure 18 In the example described, a portion of the surface of the first annular groove V1 is the surface of the annular protrusion 441. More specifically, the portion of the surface of the first annular groove V1 is constituted by the lower surface 441d of the annular protrusion 441.

[0117] (Configuration of the annular accommodation space SP)

[0118] In Figure 18 In the example described, the end portion e4 of the annular accommodation space SP on the first direction DR1 side is disposed further on the first direction DR1 side than the second gap G2, and the end portion e5 of the annular accommodation space SP on the second direction DR2 side is disposed further on the second direction DR2 side than the second gap G2. In this case, the size of the region including the annular accommodation space SP and the second gap G2 can be made compact compared to when the entire annular accommodation space SP is disposed further on the first direction DR1 side than the second gap G2.

[0119] As Figure 19 illustrated, the distance between the outermost edge e6 of the first gap G1 and the first axis AX1 is defined as a third distance LT3, and the distance between the outermost edge e7 of the annular accommodation space SP and the first axis AX1 is defined as a fourth distance LT4.

[0120] In Figure 19 In the example described, the fourth distance LT4 is greater than the third distance LT3. In this case, since a portion of the annular accommodation space SP can be ensured further on the radial outer direction DR4 than the first gap G1, the volume of the entire annular accommodation space SP can be increased.

[0121] In Figure 20 In the example described, the fourth portion 42 of the housing 4 has, in addition to the first annular groove V1 that is recessed in the radial inner direction DR3 (in other words, in the direction toward the first axis AX1), a second annular groove V2 that is recessed in the radial outer direction DR4 (in other words, in the direction away from the first axis AX1). In Figure 20 In the example described, the second annular groove V2 is disposed so as to face the annular accommodation space SP and to oppose the first annular groove V1.

[0122] In Figure 20In the example described, oil can be stored in both the first annular groove V1 and the second annular groove V2. In this case, the annular storage space SP includes the space defined by the first annular groove V1 and the space defined by the second annular groove V2, and the volume of the entire annular storage space SP can be increased.

[0123] (Configuration of the opening portion 45)

[0124] As Figure 8 , Figure 19 illustrated, the spindle device 1 of the machine tool has an opening portion 45 that guides oil from the annular storage space SP to the recovery flow passage 71. At least a portion of the opening portion 45 is disposed on the first direction DR1 side more than the second gap G2. It is preferable to dispose at least a portion of the opening portion 45 on the first direction DR1 side more than the outermost edge 441e of the annular protrusion 441. Further, it is preferable to dispose the entire opening portion 45 on the first direction DR1 side more than the first face 44a.

[0125] The distance between the end e4 of the first direction DR1 side of the annular storage space SP and the opening portion 45 is defined as a fifth distance LT5, and the distance between the end e5 of the second direction DR2 side of the annular storage space SP and the opening portion 45 is defined as a sixth distance LT6. In Figure 19 In the example described, the fifth distance LT5 is smaller than the sixth distance LT6. In this case, the opening portion 45 is disposed at a position relatively close to the bottom of the annular storage space SP. Therefore, the amount of oil remaining in the bottom of the annular storage space SP that is not recovered by the recovery flow passage 71 is reduced. Further, it is difficult for oil to flow back from the annular storage space SP to the first gap G1.

[0126] In Figure 20 the example described, the entire opening portion 45 faces the outer side face S1 of the annular storage space SP. Alternatively, as Figure 21 illustrated, at least a portion of the opening portion 45 can face the end face S2 of the first direction DR1 of the annular storage space SP. In Figure 21 the example described, a portion of the opening portion 45 faces the outer side face S1 of the annular storage space SP, and another portion of the opening portion 45 faces the end face S2 of the first direction DR1 of the annular storage space SP.

[0127] (Annular protrusion 441)

[0128] In Figure 18 the example described, the annular protrusion 441 functions as a recovery member that suppresses oil E entering the annular storage space SP from entering the second gap G2.

[0129] In Figure 19In the recorded example, the distance between the outermost edge 441e of the annular protrusion 441 and the first axis AX1 (in other words, the "second distance LT2") is less than the distance between the outermost edge e3 of the step surface 25a of the rotating body 2 and the first axis AX1 (in other words, the "first distance LT1"). Alternatively, the second distance LT2 may also be equal to the first distance LT1.

[0130] When the second distance LT2 is less than or equal to the first distance LT1, it is possible to prevent or suppress the oil E from colliding with the annular protrusion 441 from the first gap G1 toward the first direction DR1. Therefore, the oil E from the first gap G1 toward the first direction DR1 is less likely to enter the gap between the step surface 25a and the annular protrusion 441 (or the second gap G2 between the step surface 25a and the first surface 44a).

[0131] exist Figure 20 In the recorded example, the annular protrusion 441 has an upper surface 441a, an outer surface 441c, and a lower surface 441d.

[0132] The upper surface 441a is an annular surface facing the stepped surface 25a of the rotating body 2. The upper surface 441a can be perpendicular to the first axis AX1 or inclined relative to the surface perpendicular to the first axis AX1.

[0133] exist Figure 20 In the described example, the outer surface 441c faces the annular containment space SP. In a longitudinal section passing through the first axis AX1, the outer surface 441c is parallel to the first axis AX1. Alternatively, in a longitudinal section passing through the first axis AX1, the outer surface 441c may also be slightly inclined relative to the first axis AX1.

[0134] exist Figure 20 In the described example, the lower surface 441d is an annular surface facing the annular receiving space SP. The lower surface 441d may also include an inclined surface CS that approaches the first axis AX1 as it faces the first direction DR1. For example... Figure 20 As shown by the dashed arrow, the inclined surface CS guides the oil moving upward within the annular receiving space SP in a direction away from the second gap G2 (more specifically, away from the first axis AX1). Therefore, it is possible to effectively suppress the oil within the annular receiving space SP from moving towards the second gap G2.

[0135] exist Figure 20 In the described example, the lower surface 441d includes not only the aforementioned inclined surface CS, but also a surface HS perpendicular to the first axis AX1. The outer edge of the surface HS connects to the inner edge of the aforementioned inclined surface CS. Alternatively, either the aforementioned inclined surface CS or the aforementioned surface HS may be omitted.

[0136] exist Figure 16In the described example, the housing 4 has a first component CP1 (more specifically, an annular first component CP1) including the aforementioned annular protrusion 441, and a second component CP2 (more specifically, an annular second component CP2) supporting the first component CP1. When the first component CP1 including the annular protrusion 441 is a different component from the second component CP2, the design freedom of the internal shape of the housing 4 (e.g., the freedom of the shape of the annular receiving space SP) can be increased.

[0137] exist Figure 16 In the described example, the first component CP1 and the second component CP2 each have portions facing the annular receiving space SP. Alternatively, the first component CP1 and the second component CP2 may each form a portion of the surface defining the first annular groove V1. Furthermore, in a longitudinal section passing through the first axis AX1, the first component CP1 may also have a generally L-shaped form. The second component CP2 may also be an end plate disposed at the end of the housing 4 on the first direction DR1 side.

[0138] exist Figure 16 In the described example, the annular protrusion 44 is composed of multiple components (CP1, CP2). Alternatively, the annular protrusion 44 may also be composed of a single component.

[0139] (Air injection port OP1 and exhaust port 49)

[0140] exist Figure 18 In the example described, an air jet port OP1 communicating with the third gap G3 is formed between the front end 46 of the housing 4 and the rotating body 2.

[0141] Furthermore, an air passage 93 is formed in the housing 4 for the flow of air supplied from the air source (hereinafter referred to as "second air" to distinguish it from the air in the mixed fluid supplied by the lubrication device).

[0142] Furthermore, an outlet 49 for discharging second air is formed in the housing 4. The outlet 49 discharges the second air received from the air flow channel 93 to the third gap G3, so as to form a first air flow from the third gap G3 toward the second gap G2 and a second air flow from the third gap G3 toward the air injection port OP1.

[0143] The second air ejected from the air injection port OP1 prevents foreign objects such as chips from entering the machine tool's spindle assembly 1 via the third gap G3. More specifically, in Figure 14 In the described example, the second air injected from the air jet OP1 forms an air curtain AC around the tool T or tool holder HD. This air curtain prevents foreign objects such as chips from entering the machine tool's spindle assembly 1 via the third gap G3, etc.

[0144] exist Figure 18In the example described, the second air from the third gap G3 toward the second gap G2 prevents the oil from the first gap G1 or the annular accommodation space SP from entering the second gap G2. In addition, the second air from the third gap G3 toward the second gap G2 pushes back the oil that has entered the second gap G2 toward the annular accommodation space SP.

[0145] In addition, at least a portion of the second air from the third gap G3 toward the second gap G2 reaches the annular accommodation space SP. The air that has reached the annular accommodation space SP is recovered via the recovery flow passage 71.

[0146] (Rotating body 2)

[0147] In Figure 22 In the example described, the rotating body 2 (more specifically, the rotating shaft 20) has the rotating shaft body 21, the mounting portion 28 that mounts the tool T, and the rod-shaped member 291 that is coupled to the mounting portion 28. The rod-shaped member 291 is disposed inside the rotating shaft body 21. In Figure 22 In the example described, if the mounting portion driving device 11 of the processing head 10 presses the rod-shaped member 291 in the first direction DR1, the rod-shaped member 291 and the mounting portion 28 relatively move in the first direction DR1 with respect to the rotating shaft body 21. In this state, the tool T mounted to the mounting portion 28 can be replaced with another tool. After the tool is replaced, the urging member 293 (for example, a disc spring) disposed to the rotating shaft 20 presses the rod-shaped member 291 in the second direction DR2. In this way, the rod-shaped member 291 and the mounting portion 28 relatively move in the second direction DR2 with respect to the rotating shaft body 21.

[0148] In Figure 23 In the example described, a hatched pattern composed of dots is applied to the first portion 25 in order to facilitate grasping the shape of the first portion 25 of the rotating body 2. In Figure 23 In the example described, the first portion 25 and the second portion 26 each constitute a portion of the rotating shaft body 21. In other words, the rotating shaft body 21 includes the first portion 25 and the second portion 26. The first portion 25 and the second portion 26 can be constituted by one member or by an assembly of a plurality of members. In addition, the first portion 25 and the second portion 26 can each be constituted by one member or by an assembly of a plurality of members.

[0149] In Figure 23 In the example described, the first portion 25 has the above-described stepped surface 25a and the above-described first outer peripheral surface 25u. Additionally, the first portion 25 can also have a second stepped surface 25b and / or a third outer peripheral surface 25w. In Figure 23In the example described, the annular protrusion 250 is defined by the step face 25a, the first outer peripheral face 25u, and the second step face 25b. In other words, the first portion 25 of the rotating body 2 has the annular protrusion 250 having the step face 25a, the first outer peripheral face 25u, and the second step face 25b.

[0150] In Figure 23 In the example described, the step face 25a is a face on the first direction DR1 side of the first portion 25. The first outer peripheral face 25u is a face disposed opposite at least a portion of the third portion 41 of the housing 4. The second step face 25b is a face in contact with an end face on the first direction DR1 side of the inner ring 31a of the first bearing 3a. Further, the third outer peripheral face 25w is a face in contact with an inner peripheral face of the inner ring 31a of the first bearing 3a.

[0151] The first portion 25 of the rotating body 2 can also have a first inner peripheral face 25n in contact with the tool holder HD. In Figure 23 In the example described, the first inner peripheral face 25n is a tapered face that increases in diameter as it goes toward the first direction DR1.

[0152] In Figure 23 In the example described, the second portion 26 of the rotating body 2 has a maximum outer diameter that is smaller than the outer diameter of the step face 25a. In other words, the second portion 26 as a whole is reduced in diameter compared to the outer periphery of the step face 25a.

[0153] In Figure 23 In the example described, the second portion 26 has a second outer peripheral face 26u and an end face 26f. The end face 26f is disposed at an end portion of the second portion 26 on the first direction DR1 side.

[0154] The end face 26f of the second portion 26 is located further on the first direction DR1 than an end face on the first direction DR1 side of the fourth portion 42 of the housing 4 (more specifically, the third face 44f of the annular protrusion 44). The tool holder HD can also be disposed in contact with the end face 26f of the second portion 26.

[0155] The second portion 26 of the rotating body 2 can also have a second inner peripheral face 26n in contact with the tool holder HD. In Figure 23 In the example described, the second inner peripheral face 26n is a tapered face that increases in diameter as it goes toward the first direction DR1. In Figure 22 In the example described, the inner peripheral faces (25n, 26n) in contact with the tool holder HD are disposed in a manner that spans the first portion 25 of the rotating body 2 and the second portion 26 of the rotating body 2.

[0156] (Housing 4)

[0157] In Figure 24In the described example, the housing 4 has a front end portion 4a, a rear end portion 4b, and an intermediate portion 4c between the front end portion 4a and the rear end portion 4b.

[0158] The front end portion 4a of the housing 4 supports the outer ring of the front bearing. Figure 24 In the example described, the front end portion 4a of the housing 4 supports the outer ring 32a of the first bearing 3a and the outer ring 32c of the third bearing 3c.

[0159] The front end portion 4a of the housing 4 includes the aforementioned third portion 41 and fourth portion 42. Figure 2 In the described example, the fourth part 42 includes the entire surface of the defined annular receiving space SP in the housing 4 and the entire annular protrusion 44. Furthermore, the fourth part 42 is positioned further towards the first direction DR1 than the third part 41.

[0160] like Figure 15 or Figure 8 As illustrated, the fourth part 42 has a base 43 connected to the third part 41, and an annular protrusion 44 projecting from the base 43 toward the first axis AX1. Figure 18 or Figure 18 In the described example, the annular protrusion 44 has a first wall 440a defining the bottom surface of the annular receiving space SP (in other words, the end face of the annular receiving space SP on the first direction DR1 side), a second wall 440b defining the second surface 44b facing the second outer peripheral surface 26u of the rotating body 2, and an annular protrusion 441 protruding from the second wall 440b in a direction away from the first axis AX1.

[0161] exist Figure 24 In the described example, the first wall 440a is an annular wall connected to the base 43 of the fourth portion 42 and extending from the base 43 in a radially inward direction DR3. Furthermore, the second wall 440b is an annular wall connected to the inner edge of the first wall 440a and extending from the inner edge in a second direction DR2. Additionally, an annular protrusion 441 is connected to the end of the second wall 440b on the second direction DR2 side and protrudes from that end in a radially outward direction DR4.

[0162] The housing 4 may also have an outwardly protruding flange 47. Figure 22 In the example described, flange 47 is disposed on the front end portion 4a of housing 4. An outlet port 71p of the recovery channel 71 may also be provided on flange 47.

[0163] The rear end portion 4b of housing 4 supports the outer ring of the rear bearing. Figure 22In the example described, the rear end side portion 4b of the housing 4 supports an outer ring of the second bearing 3b. The rear end side portion 4b can also have an end plate 40b disposed at an end of the second direction DR2 side of the housing 4.

[0164] In Figure 22 In the example described, the intermediate portion 4c of the housing 4 has a cylindrical side wall 40c. The intermediate portion 4c of the housing 4 (more specifically, the cylindrical side wall 40c) can also support a stator 51 described later.

[0165] (Bearings 3)

[0166] In Figure 22 In the example described, the plurality of bearings 3 that support the rotating body 2 so as to be rotatable about the first axis AX1 include the first bearing 3a and the second bearing 3b. Additionally, the plurality of bearings 3 can also include a third bearing 3c. The third bearing 3c is disposed between the first bearing 3a and the second bearing 3b in a direction along the first axis AX1. The third bearing 3c is, for example, a ball bearing.

[0167] The first bearing 3a constitutes at least a portion of a front side bearing that supports the front end portion 24 of the rotating body 2. In Figure 22 In the example described, the first bearing 3a is the bearing disposed at the most first direction DR1 side (in other words, the most front end side) among the plurality of bearings 3 that support the rotating body 2. The first bearing 3a is, for example, a ball bearing. The front side bearing that supports the front end portion 24 of the rotating body 2 can also include a plurality of bearings. In Figure 22 In the example described, the front side bearing includes the first bearing 3a and the third bearing 3c.

[0168] The second bearing 3b constitutes at least a portion of a rear side bearing that supports the rear end portion 22 of the rotating body 2. The second bearing 3b is, for example, a roller bearing. The second bearing 3b has an inner ring supported by the rotating body 2 and an outer ring supported by the housing 4. The rear side bearing can also include a plurality of bearings.

[0169] (First rotation driving device 5)

[0170] In Figure 22 In the example described, the spindle device 1 of the machine tool is provided with the first rotation driving device 5 that rotates the rotating body 2 (more specifically, the rotating shaft 20) about the first axis AX1. The first rotation driving device 5 can also be a first motor. In Figure 22 In the example described, the first rotation driving device 5 (more specifically, the first motor) has a stator 51 and a rotor 53. In this case, if a current is supplied to the stator 51, the rotor 53 rotates about the first axis AX1 due to electromagnetic action. In Figure 22 In the example described, the stator 51 is fixed to the housing 4, and the rotor 53 is fixed to the rotating body 2 (more specifically, the rotating shaft 20).

[0171] In the example described above, the rotor 53 is disposed at the intermediate portion 23 of the rotating shaft 20. In the example described above, the rotor 53 is disposed at the intermediate portion 23 of the rotating shaft 20. Figure 22 Figure 22 In the example described above, the rotor 53 is disposed at the intermediate portion 23 of the rotating shaft 20. In the example described above, the rotor 53 is disposed at the intermediate portion 23 of the rotating shaft 20.

[0172] In the example described above, the first rotary drive device 5 is disposed at the inside of the housing 4. Alternatively, the first rotary drive device 5 can also be disposed at the outside of the housing 4. For example, the first rotary drive device 5 disposed at the outside of the housing 4 can also be configured to rotate the rotating body 2 by means of an arbitrary transmission mechanism (e.g., a gear, a transmission belt, or the like). Figure 22 (Feed flow passage 66)

[0173] The spindle device 1 of the machine tool is provided with a feed flow passage 66 that feeds the mixed fluid containing oil and air to the bearing 3 (e.g., the first bearing 3a). At least a portion of the feed flow passage 66 is disposed at the housing 4. At least a portion of the feed flow passage 66 can also be constituted by a through-hole formed in the housing 4.

[0174] The feed flow passage 66 can also feed the mixed fluid containing oil and air to a plurality of bearings including the first bearing 3a. In the example described above, the feed flow passage 66 feeds the mixed fluid containing oil and air to the first bearing 3a and the third bearing 3c. Additionally, the feed flow passage 66 can also feed the mixed fluid containing oil and air to the second bearing 3b.

[0175] Figure 22 In the example described above, the feed flow passage 66 feeds the mixed fluid containing oil and air to the first bearing 3a and the third bearing 3c. Additionally, the feed flow passage 66 can also feed the mixed fluid containing oil and air to the second bearing 3b.

[0176] (Recovery flow passage 71)

[0177] The spindle device 1 of the machine tool is provided with a recovery flow passage 71 that recovers oil E that has passed through the bearing 3 (more specifically, the first bearing 3a). The recovery flow passage 71 can also recover at least a portion of the air that is fed to the bearing 3 (more specifically, the first bearing 3a) from the feed flow passage 66. Furthermore, the recovery flow passage 71 can also recover at least a portion of the second air that is fed to the third gap G3 (if necessary, refer to Figure 22 ) from the air flow passage 93. At least a portion of the recovery flow passage 71 is disposed at the housing 4. At least a portion of the recovery flow passage 71 can also be constituted by a through-hole formed in the housing 4.

[0178] (Second recovery flow passage 72)

[0179] The spindle device 1 of the machine tool can also be provided with a second recovery flow passage 72 that recovers the oil-containing fluid containing oil and air from the bearing 3 (more specifically, the first bearing 3a). In the example described above, the second recovery flow passage 72 recovers the oil-containing fluid containing oil and air from the bearing 3 (more specifically, the first bearing 3a). Figure 18 ​​In the documented example, the second recovery channel 72 is a separate channel from the recovery channel 71. Figure 25 In the described example, the second recovery channel 72 recovers oil directly from bearing 3 (more specifically, first bearing 3a). Oil E that has passed through bearing 3 (more specifically, first bearing 3a) but was not recovered by the second recovery channel 72 is recovered by recovery channel 71.

[0180] At least a portion of the second recovery channel 72 is disposed in the housing 4. At least a portion of the second recovery channel 72 may also be formed by a through hole formed in the housing 4.

[0181] The second recovery channel 72 can also recover oil-containing fluids, including oil and air, from multiple bearings including the first bearing 3a. Figure 26 In the recorded example, the second recovery channel 72 recovers oily fluid from the first bearing 3a, which is part of the front bearing, and the third bearing 3c, which is part of the front bearing.

[0182] (Third recovery channel 73)

[0183] The machine tool's spindle assembly 1 may also include a third recovery channel 73 for recovering oil-containing fluid, including oil and air, from the second bearing 3b. Figure 25 In the documented example, the third recovery channel 73 is a separate channel from the second recovery channel 71 and the second recovery channel 72. Figure 26 In the recorded example, the third recovery channel 73 directly recovers oil from the second bearing 3b.

[0184] At least a portion of the third recovery channel 73 is disposed in the housing 4. At least a portion of the third recovery channel 73 may also be formed by a through hole formed in the housing 4.

[0185] The third recovery channel 73 can also recover oil-containing fluid from multiple bearings including the second bearing 3b. For example, the third recovery channel 73 can also recover oil-containing fluid from multiple bearings constituting the rear bearing.

[0186] Air (or oil) that is not recovered by the recovery channel 71, the second recovery channel 72, and the third recovery channel 73 is discharged from the gap of the machine tool spindle assembly 1 to the outside of the spindle assembly (see reference). Figure 27 (The dashed arrow in the middle).

[0187] (Third Implementation)

[0188] Reference Figure 27 The machine tool 100 in the third embodiment will be described. Figure 25 This is a schematic perspective view illustrating an example of the machine tool 100 in the third embodiment. Figure 2 This is a schematic perspective view illustrating another example of the machine tool 100 in the third embodiment.

[0189] Figure 7 is a diagram schematically showing a case where the control device 140 can control a plurality of control target apparatuses.

[0190] In the third embodiment, description will be made focusing on the points different from the first embodiment and the second embodiment. On the other hand, in the third embodiment, repeated description of matters already described in the first embodiment or the second embodiment will be omitted. Therefore, in the third embodiment, even if not explicitly described, matters already described in the first embodiment or the second embodiment can of course be applied to the third embodiment.

[0191] As exemplified in Figure 12 and Figure 15 , the machine tool 100 in the third embodiment is provided with the machining head 10, the lubricating device 6, the recovering device 7, a workpiece supporting device 110 that supports the workpiece W, a moving device 120 that relatively moves the machining head 10 with respect to the workpiece supporting device 110, and a control device 140 that controls at least the first rotary drive device 5 and the moving device 120.

[0192] As exemplified in Figure 21 , the machining head 10 is provided with: (1) a rotary body 2 (more specifically, a rotary shaft 20) having a rear end portion 22 and a front end portion 24 that holds a tool T; (2) a plurality of bearings 3 including a first bearing 3a; (3) a housing 4 that supports the rotary body 2 so as to be rotatable about a first axis AX1 by means of the plurality of bearings 3; and (4) a first rotary drive device 5 that rotates the rotary body 2 about the first axis AX1.

[0193] As exemplified in Figure 28 , the rotary body 2 (more specifically, the rotary shaft 20) has a first portion 25, a second portion 26, and a step face 25a. The first portion 25 supports an inner ring 31a of the first bearing 3a, and has a first outer peripheral face 25u. The second portion 26 is disposed on the first direction DR1 side more than the first portion 25, and has a second outer peripheral face 26u that is smaller in diameter than the first outer peripheral face 25u. The step face 25a connects the first outer peripheral face 25u and the second outer peripheral face 26u.

[0194] Since the rotary body 2 has already been described in the first embodiment or the second embodiment, repeated description of the rotary body 2 will be omitted.

[0195] As exemplified in Figure 28 , the housing 4 has a third portion 41 that supports an outer ring 32a of the first bearing 3a, and a fourth portion 42 that defines an annular accommodation space SP that receives the oil E from a first gap G1 between the first portion 25 of the rotary body 2 and the third portion 41.

[0196] The fourth portion 42 has an opening portion 45 that guides the oil E from the annular accommodation space SP toward the recovery flow passage 71, and an annular protrusion 441 that protrudes toward a direction away from the first axis AX1 while facing both the stepped surface 25a of the rotating body 2 and the annular accommodation space SP.

[0197] Since the housing 4 has been described in the first embodiment or the second embodiment, repeated description of the housing 4 is omitted.

[0198] In Figure 28 In the described example, the lubricating device 6 supplies the mixed fluid containing the oil and the air to the first bearing 3a by means of the supply flow passage 66.

[0199] The recovery device 7 recovers at least a portion of the oil E that has passed through the first bearing 3a by means of the recovery flow passage 71.

[0200] The third embodiment achieves the same effects as the first embodiment (or the second embodiment).

[0201] (Any Additional Structure)

[0202] Next, the description will be made with reference to Figure 28 Any additional structure that can be employed in the machine tool 100 in the third embodiment (or the spindle device 1A of the machine tool in the first embodiment or the spindle device 1B of the machine tool in the second embodiment) will be described.

[0203] (Lubricating Device 6)

[0204] In Figure 28 In the described example, the lubricating device 6 has an air source AS1 (for example, an air compressor), an oil tank 62, a pump 63, a mixer 64, a supply flow passage 66, and a supply pipe 68 that connects the mixer 64 and the supply flow passage 66.

[0205] The air source AS1 supplies the air to the mixer 64. The pump 63 supplies the oil from the oil tank 62 to the mixer 64. The mixer 64 mixes the air received from the air source AS1 and the oil received from the oil tank 62, and forms the mixed fluid (more specifically, the oil gas) containing the oil and the air. Further, the mixer 64 delivers the mixed fluid to the supply flow passage 66 by means of the supply pipe 68.

[0206] In Figure 2 In the described example, the supply pipe 68 is arranged outside the housing 4, and the supply flow passage 66 is arranged inside the housing 4. The supply flow passage 66 supplies the mixed fluid containing the oil and the air to at least the first bearing 3a. Additionally, the supply flow passage 66 can also supply the mixed fluid containing the oil and the air to the second bearing 3b and / or the third bearing 3c.

[0207] (recovery device 7)

[0208] In Figure 7 the example described, the recovery device 7 includes a recovery flow passage 71, a first ejector 75a, a first pipe 74a connecting the recovery flow passage 71 and the first ejector 75a, a first exhaust pipe 76a, an exhaust purifier 77, a recovery container 78, and an air source AS2 (e.g., an air compressor). The air source AS2 of the recovery device 7 can be the same as or different from the air source AS1 of the lubricating device 6.

[0209] The recovery device 7 can also include a second recovery flow passage 72, a second ejector 75b, a second pipe 74b connecting the second recovery flow passage 72 and the second ejector 75b, and a second exhaust pipe 76b. Furthermore, the recovery device 7 can also include a third recovery flow passage 73, a third ejector 75c, a third pipe 74c connecting the third recovery flow passage 73 and the third ejector 75c, and a third exhaust pipe 76c.

[0210] In Figure 12 the example described, the recovery flow passage 71 is disposed inside the housing 4, and the first pipe 74a is disposed outside the housing 4. In Figure 15 the example described, the recovery flow passage 71 and the first pipe 74a are fluidly connected by means of an outlet port 71p provided to the housing 4 (more specifically, the flange 47).

[0211] As Figure 21 illustrated, the recovery flow passage 71 receives oil from the annular accommodation space SP by means of the opening portion 45. More specifically, the recovery flow passage 71 receives an oil-containing fluid (hereinafter referred to as "first oil-containing fluid") containing at least a portion of the oil that has passed through the first bearing 3a from the annular accommodation space SP.

[0212] In Figure 29 the example described, the first ejector 75a uses air (hereinafter referred to as "third air") supplied from the air source AS2 to the first ejector 75a to create negative pressure in the first pipe 74a. Furthermore, the first ejector 75a transports the third air received from the air source AS2 and the first oil-containing fluid received from the recovery flow passage 71 by means of the first pipe 74a to the exhaust purifier 77 via the first exhaust pipe 76a.

[0213] In Figure 30 the example described, the second recovery flow passage 72 is disposed inside the housing 4, and the second pipe 74b is disposed outside the housing 4. In ​ the example described, the second recovery flow passage 72 and the second pipe 74b are fluidly connected by means of a second outlet port 72p provided to the housing 4 (more specifically, the flange 47).

[0214] As​ As exemplified, the second recovery flow passage 72 receives an oil-containing fluid (hereinafter referred to as "second oil-containing fluid") at least from the first bearing 3a. The second recovery flow passage 72 can also receive the second oil-containing fluid from a plurality of front-side bearings including the first bearing 3a (e.g., the first bearing 3a and the third bearing 3c).

[0215] In ​ In the example described, the second ejector 75b causes the second conduit 74b to generate a negative pressure using air (hereinafter referred to as "fourth air") supplied from the air source AS2 to the second ejector 75b. Further, the second ejector 75b transports the fourth air received from the air source AS2 and the second oil-containing fluid received from the second recovery flow passage 72 via the second conduit 74b to the exhaust purifier 77 via the second exhaust conduit 76b.

[0216] In ​ In the example described, the third recovery flow passage 73 is disposed inside the housing 4, and the third conduit 74c is disposed outside the housing 4. In ​ In the example described, the third recovery flow passage 73 is fluidly connected to the third conduit 74c by way of the third outlet port 73p provided to the housing 4.

[0217] The third recovery flow passage 73 receives an oil-containing fluid (hereinafter referred to as "third oil-containing fluid") at least from the second bearing 3b. The third recovery flow passage 73 can also receive the third oil-containing fluid from a plurality of rear-side bearings including the second bearing 3b.

[0218] In ​ In the example described, the third ejector 75c causes the third conduit 74c to generate a negative pressure using air (hereinafter referred to as "fifth air") supplied from the air source AS2 to the third ejector 75c. Further, the third ejector 75c transports the fifth air received from the air source AS2 and the third oil-containing fluid received from the third recovery flow passage 73 via the third conduit 74c to the exhaust purifier 77 via the third exhaust conduit 76c.

[0219] The exhaust purifier 77 receives an oil-containing fluid from a plurality of ejectors including the first ejector 75a (e.g., the first ejector 75a, the second ejector 75b, and the third ejector 75c) via a plurality of exhaust conduits including the first exhaust conduit 76a (e.g., the first exhaust conduit 76a, the second exhaust conduit 76b, and the third exhaust conduit 76c). Further, the exhaust purifier 77 separates the oil-containing fluid received from the plurality of exhaust conduits including the first exhaust conduit 76a into liquid oil and air. The liquid oil separated from the oil-containing fluid by the exhaust purifier 77 is stored in the recovery container 78.

[0220] (Air supply device 9)

[0221] The machine tool 100 in the third embodiment can also be provided with the air supply device 9. The air supply device 9 supplies air to the discharge port 49 formed in the housing 4.

[0222] In ​ the example described, the air supply device 9 has an air source AS3 (e.g., an air compressor), an air flow passage 93, and an air supply pipe 91 connecting the air source AS3 and the air flow passage 93. The air source AS3 of the air supply device 9 can be the same as the air source AS1 of the lubrication device 6, or can be different from the air source AS1 of the lubrication device 6. Further, the air source AS3 of the air supply device 9 can be the same as the air source AS2 of the recovery device 7, or can be different from the air source AS2 of the recovery device 7. The air source AS3 supplies the second air to the air flow passage 93 via the air supply pipe 91.

[0223] In ​ the example described, the air supply pipe 91 is disposed outside the housing 4, and the air flow passage 93 is disposed inside the housing 4. In ​ the example described, the air supply pipe 91 and the air flow passage 93 are fluidly connected via a supply port 93p provided to the housing 4 (more specifically, the flange 47).

[0224] The air flow passage 93 supplies the second air received from the air supply pipe 91 to the discharge port 49. Further, in ​ the example described, the discharge port 49 discharges the second air received from the air flow passage 93 to the third gap G3. The second air discharged to the third gap G3 forms a first air flow from the third gap G3 toward the second gap G2 and a second air flow from the third gap G3 toward the air injection port OPl.

[0225] (workpiece support device 110)

[0226] In ​ the example described, the workpiece support device 110 has a support 111 (more specifically, a table 111a) that supports the workpiece W, and a second rotation drive device 112 that rotates the support 111 (more specifically, the table 111a) about the second axis AX2. The workpiece support device 110 can also have a tilt movement device 113 that tilt-moves the table 111a about an axis AX3 that is perpendicular to the second axis AX2.

[0227] Alternatively, as ​ illustrated, the workpiece support device 110 can also have a chuck 111b that holds the workpiece W, and a second rotation drive device 112 that rotates the chuck 111b about the second axis AX2.

[0228] (movement device 120)

[0229] The moving device 120 moves the machining head 10 relative to the workpiece support device 110. The moving device 120 can also be a device capable of moving the machining head 10 in three dimensions. The moving device 120 can also be a device capable of moving the machining head 10 along a Z-axis parallel to the vertical direction. The moving device 120 can also be a device capable of moving the machining head 10 along an X-axis parallel to the horizontal direction. Furthermore, the moving device 120 can also be a device capable of moving the machining head 10 along a Y-axis perpendicular to both the X-axis and the Z-axis. In ​ And ​ In the example described, the machining head 10 is supported by the base 130 by means of the moving device 120.

[0230] (CONTROL DEVICE 140)

[0231] The control device 140 controls at least the first rotary drive device 5 and the moving device 120.

[0232] For example, in ​ In the example described, if the control device 140 sends a first movement instruction J1 to the moving device 120, the moving device 120 receiving the first movement instruction J1 moves the machining head 10 relative to the workpiece support device 110. In this way, the tool T held by the rotary body 2 can be moved towards the workpiece W.

[0233] Furthermore, if the control device 140 sends a first rotation instruction R1 to the first rotary drive device 5, the first rotary drive device 5 receiving the first rotation instruction R1 rotates the rotary body 2 about the first axis AX1. In this way, the tool T held by the rotary body 2 can machine the workpiece W.

[0234] The control device 140 can also control the lubrication device 6 and / or the recovery device 7.

[0235] For example, if the control device 140 sends a first control instruction C1 to the lubrication device 6 (for example, the air source AS1, the pump 63, the on-off valve, the flow control valve, etc.), the lubrication device 6 receiving the first control instruction C1 supplies a mixed fluid containing oil and air to at least one bearing including the first bearing 3a. Furthermore, if the control device 140 sends a second control instruction C2 to the recovery device 7 (for example, the air source AS2, the on-off valve, the flow control valve, etc.), the recovery device 7 receiving the second control instruction C2 recovers at least a portion of the oil that has passed through the first bearing 3a. Furthermore, the recovery device 7 receiving the second control instruction C2 recovers the oil-containing fluid from the first bearing 3a, the second bearing 3b and the third bearing 3c.

[0236] Alternatively, the control device 140 can control the air supply device 9. For example, if the control device 140 sends a third control command C3 to the air supply device 9 (e.g., air source AS3, on / off valve, and flow control valve), the air supply device 9 receiving the third control command C3 supplies second air to the outlet 49. The outlet 49 discharges the second air received from the air passage 93 into the third gap G3. The second air discharged into the third gap G3 forms a first airflow from the third gap G3 toward the second gap G2 and a second airflow from the third gap G3 toward the air injection port OP1.

[0237] Alternatively, the control device 140 can control the second rotary drive device 112. For example, if the control device 140 sends a second rotation command R2 to the second rotary drive device 112, the second rotary drive device 112 that receives the second rotation command R2 causes the support member 111 supporting the workpiece W to rotate around the second axis AX2.

[0238] like ​ As illustrated, the control device 140 includes a hardware processor 141 (hereinafter referred to as "processor 141"), a memory 142, a communication circuit 144, and an input device 146 (e.g., a display 146a with a touch panel). The processor 141, memory 142, communication circuit 144, and input device 146 are interconnected via a bus 148.

[0239] The memory 142 stores data 142a required for machining the workpiece, and programs 142b for causing the various components of the machine tool 100 to operate. The memory 142 is a storage medium that can be read by the processor 141 of the control device 140. The memory 142 may be, for example, a non-volatile or volatile semiconductor memory such as RAM, ROM, and flash memory, or a disk, or other forms of memory.

[0240] The input device 146 is not limited to a display 146a with a touch panel. For example, the control device 140 may also include input devices 146 such as buttons, switches, joysticks, pointing devices, and keyboards, as well as a display showing the data or other information input to the input device 146. Furthermore, multiple computers may collaborate to function as the control device 140. Additionally, the memory 142 may be distributed across multiple locations. For example, a portion of the memory 142 may be contained in cloud storage.

[0241] The control device 140 generates control commands by executing program 142b stored in memory 142 through processor 141. Furthermore, communication circuit 144 sends these control commands to the controlled device (more specifically, the first rotary drive 5, the moving device 120, the lubrication device 6, the recovery device 7, the air supply device 9, and the second rotary drive 112, etc.). Thus, by executing program 142b through processor 141, the control device 140 can control the first rotary drive 5, the moving device 120, the lubrication device 6, the recovery device 7, the air supply device 9, and the second rotary drive 112, etc.

[0242] This invention is not limited to the embodiments or modifications described above. It is obvious that appropriate modifications or alterations can be made to the embodiments or modifications within the scope of the inventive concept. Furthermore, as long as no technical contradiction arises, the various techniques used in the embodiments or modifications can also be applied to other embodiments or modifications. Moreover, any additional structures in the embodiments or modifications can be appropriately omitted.

[0243] For example, in ​ In the example described, machine tool 100 is a vertical machining center. Alternatively, machine tool 100 in the embodiment could also be a horizontal machining center. Furthermore, machine tool 100 could also be a multi-functional machining machine capable of performing machining other than cutting.

[0244] In addition, ​ , ​ , ​ , ​ and ​ The diagram illustrates an example where the first part 25 and the second part 26 of the rotating body 2 are each composed of a portion of the rotating shaft body 21. Alternatively, as shown... ​ As illustrated, at least a portion of the first part 25 and the second part 26 of the rotating body 2 may be composed of components other than the rotating shaft body 21.

[0245] exist ​ In the described example, the first part 25 of the rotating body 2 is composed of a portion of the rotating shaft body 21 and the base end portion BL1 of the inner ring retainer BL. The inner ring retainer BL forms part of the rotating body 2 and has a first outer peripheral surface 25u. Furthermore, the inner ring retainer BL is fixed to the rotating shaft body 21 by means of fixing members such as bolts.

[0246] exist ​In the example described, the inner ring 31 is supported by the rotation shaft main body 21 and the inner ring holding body BL. Further, a first gap G1 is formed between the first portion 25 of the rotation body 2 (more specifically, the base end side portion BL1 of the inner ring holding body BL) and the third portion 41 of the housing 4.

[0247] In ​ In the example described, the second portion 26 of the rotation body 2 is constituted by the front end side portion BL2 of the inner ring holding body BL. The second portion 26 of the rotation body 2 (more specifically, the front end side portion BL2 of the inner ring holding body BL) has a second outer peripheral surface 26u that is smaller in diameter than the first outer peripheral surface 25u, and is disposed on the first direction DR1 side more than the first portion 25 of the rotation body 2 (more specifically, the base end side portion BL1 of the inner ring holding body BL).

[0248] In ​ In the example described, the rotation body 2 (more specifically, the inner ring holding body BL) has a step surface 25a that connects the first outer peripheral surface 25u and the second outer peripheral surface 26u. Further, a second gap G2 that is in fluid communication with the first gap G1 is formed between the first face 44a of the annular protrusion 44 and the step surface 25a. Furthermore, a third gap G3 that is in fluid communication with the second gap G2 is formed between the second face 44b of the annular protrusion 44 and the above-described second outer peripheral surface 26u.

[0249] Further, in ​ , ​ , ​ , ​ and ​ In the example described, the first gap G1 is linear on a longitudinal section that includes the first axis AX1. Alternatively, as exemplified in ​ , the first gap G1 can also have a labyrinth shape on a longitudinal section that includes the first axis AX1. Alternatively or additionally, as exemplified in ​ , a notch CT can also be formed in a portion of the face that defines the first gap G1. This notch CT can be formed in the first outer peripheral surface 25u of the rotation body 2, or in the surface of the third portion 41 of the housing 4.

[0250] BRIEF DESCRIPTION OF REFERENCE NUMERALS

[0251] 1, 1A, 1B main shaft device of a machine tool, 2 rotating body, 3 bearing, 3a first bearing, 3b second bearing, 3c third bearing, 4 housing, 4a front end side portion of the housing, 4b rear end side portion of the housing, 4c middle portion of the housing, 4f end face of the housing, 5 first rotary drive device, 6 lubricating device, 7 recovery device, 9 air supply device, 10 machining head, 11 mounting portion drive device, 20 rotating shaft, 21 rotating shaft main body, 22 rear end portion of the rotating body, 23 middle portion of the rotating shaft, 24 front end portion of the rotating body, 25 first portion, 25a step face, 25b second step face, 25n first inner peripheral face, 25u first outer peripheral face, 25w third outer peripheral face, 26 second portion, 26f end face of the second portion, 26n second inner peripheral face, 26u second outer peripheral face, 28 mounting portion, 31, 31a inner ring, 32, 32a, 32c outer ring, 33 rolling element, 40b end plate, 40c side wall of the housing, 41 third portion, 42 fourth portion, 43 base portion, 44 annular protruding portion, 44a first face, 44b second face, 44f third face, 45 opening portion, 46 front end portion, 47 flange of the housing, 49 discharge port, 51 stator, 53 rotor, 62 oil tank, 63 pump, 64 mixer, 66 supply flow passage, 68 supply pipe, 71 recovery flow passage, 71p outlet port, 72 second recovery flow passage, 72p second outlet port, 73 third recovery flow passage, 73p third outlet port, 74a first pipe, 74b second pipe, 74c third pipe, 75a first ejector, 75b second ejector, 75c third ejector, 76a first exhaust pipe, 76b second exhaust pipe, 76c third exhaust pipe, 77 exhaust purifier, 78 recovery container, 91 air supply pipe, 93 air flow passage, 93p supply port, 100 machine tool, 110 workpiece support device, 111 support member, 111a table, 111b chuck, 112 second rotary drive device, 113 tilt moving device, 120 moving device, 130 base, 140 control device, 141 hardware processor, 142 memory, 142a data, 142b program, 144 communication circuit, 146 input device, 146a display with touch panel, 148 bus, 250 annular protruding portion, 291 rod-shaped member, 293 force applying member, 440a first wall, 440b second wall, 441 annular protrusion, 441a upper face, 441c outer side face, 441d lower face, 441e outermost edge, 443d, 444d, 445d face constituting first annular groove, AC air curtain, AS1, AS2, AS3 air source, BL inner ring holder, BL1 base end side portion of the inner ring holder, BL2 front end side portion of the inner ring holder, C1 first control command, C2 second control command, C3 third control command, CN corner portion, CP1 first component, CP2 second component, CS tilt face, CT notch, E oil, G1 first gap, G2 second gap, G3 third gap,HD cutter holder, HS face perpendicular to the first axis, J1 first movement command, OP1 air injection port, R1 first rotation command, R2 second rotation command, S1 outer side surface, S2 end surface, SP annular accommodation space, T cutter, V1 first annular groove, V2 second annular groove, W workpiece, e1 outer periphery of the first face, e2 inner periphery of the first face, e3 outermost edge of the stepped face, e4 end portion of the annular accommodation space on the first direction side, e5 end portion of the annular accommodation space on the first direction side, e6 outermost edge of the first gap, e7 outermost edge of the annular accommodation space.

Claims

1. A spindle assembly for a machine tool, comprising: A rotating body having a rear end and a front end for holding the tool; Bearings have an inner ring and an outer ring; The housing supports the rotating body for rotation about a first axis by means of the bearing; A supply channel is provided to supply the bearing with a mixed fluid comprising oil and air; and The oil that has passed through the bearing is recovered through the recovery channel. The rotating body has: The first part supports the inner ring and has a first outer peripheral surface; The second part has a second outer peripheral surface with a smaller diameter than the first outer peripheral surface, and is positioned closer to the first direction side than the first part when the direction from the rear end to the front end is defined as the first direction. as well as The stepped surface connects the first outer peripheral surface and the second outer peripheral surface. The housing has: The third part supports the outer ring; and The fourth part specifies an annular receiving space for receiving the oil from the first gap between the first part and the third part. The fourth part has: The opening guides the oil from the annular receiving space to the recovery channel; and The annular protrusion protrudes toward the first axis. The annular protrusion has: The annular protrusion faces both the stepped surface and the annular receiving space, and protrudes in a direction away from the first axis; The first side faces the stepped surface; as well as The second side faces the second outer peripheral surface.

2. The spindle assembly of the machine tool according to claim 1, wherein, A second gap, which is in fluid communication with the first gap, is formed between the first surface and the stepped surface. A third gap is formed between the second surface and the second outer peripheral surface, which is in fluid communication with the second gap.

3. The spindle assembly of the machine tool according to claim 2, wherein, An air injection port communicating with the third gap is formed between the front end of the housing and the rotating body. An airflow channel is formed in the housing for the flow of a second air source. The housing is provided with an outlet for discharging the second air received from the airflow channel into the third gap, thereby forming a first airflow from the third gap toward the second gap and a second airflow from the third gap toward the air jet.

4. The spindle assembly of the machine tool according to claim 2, wherein, The annular receiving space is positioned closer to the first direction side than the second gap.

5. The spindle assembly of the machine tool according to claim 2, wherein, The second gap communicates with the first gap via the annular receiving space. When the direction opposite to the first direction is defined as the second direction, the end of the annular receiving space on the first direction side is disposed closer to the first direction side than the second gap, and the end of the annular receiving space on the second direction side is disposed closer to the second direction side than the second gap.

6. The spindle assembly of a machine tool according to any one of claims 1 to 5, wherein, The annular protrusion has a first annular groove that is recessed toward the first axis. The first annular groove faces the annular receiving space.

7. The spindle assembly of the machine tool according to claim 6, wherein, The fourth portion of the housing has a second annular groove recessed in a direction away from the first axis. The second annular groove faces the annular receiving space.

8. The spindle assembly of a machine tool according to any one of claims 1 to 5, wherein, The annular protrusion has a lower surface. The lower surface includes an inclined surface that approaches the first axis as it moves toward the first direction.

9. The spindle assembly of a machine tool according to any one of claims 1 to 5, wherein, The housing has: The first component includes the annular protrusion; and The second component supports the first component.

10. The spindle assembly of a machine tool according to any one of claims 1 to 5, wherein, The first gap and the annular receiving space are arranged on a straight line parallel to the first axis.

11. The spindle assembly of a machine tool according to any one of claims 1 to 5, wherein, When the distance between the outermost edge of the stepped surface and the first axis is defined as the first distance, and the distance between the outermost edge of the annular protrusion and the first axis is defined as the second distance, the second distance is below the first distance.

12. A machine tool comprising: A processing head having a rotating body, a plurality of bearings including a first bearing, a rotatable housing supported by the plurality of bearings on the rotating body, and a first rotation drive device for rotating the rotating body about a first axis; The lubrication device supplies a mixture of oil and air to the first bearing via a supply channel; The recovery device recovers at least a portion of the oil that has passed through the first bearing via a recovery channel; Workpiece support device, used to support the workpiece; A moving device that moves the processing head relative to the workpiece support device; as well as The control device controls at least the first rotary drive device and the moving device. The rotating body has: Rear end; The front end holds the tool; The first part, the inner ring supporting the first bearing, has a first outer peripheral surface; The second portion has a second outer peripheral surface with a smaller diameter compared to the first outer peripheral surface, and is positioned further toward the first direction than the first portion when the direction from the rear end to the front end is defined as a first direction; and The stepped surface connects the first outer peripheral surface and the second outer peripheral surface. The housing has: The third part is the outer ring supporting the first bearing; and The fourth part specifies an annular receiving space for receiving the oil from the first gap between the first part and the third part. The fourth part has: The opening guides the oil from the annular receiving space to the recovery channel; and The annular protrusion protrudes toward the first axis. The annular protrusion has: The annular protrusion faces both the stepped surface and the annular receiving space, and protrudes in a direction away from the first axis; The first side faces the stepped surface; as well as The second side faces the second outer peripheral surface.

13. The machine tool according to claim 12, wherein, A second gap, which is in fluid communication with the first gap, is formed between the first surface and the stepped surface. A third gap is formed between the second surface and the second outer peripheral surface, which is in fluid communication with the second gap.

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