Coolant hose attaching auxiliary tool and coolant hose attaching method

Abstract

To provide a technique capable of preventing remaining, in a coolant passage, an annular member used for attaching a coolant hose together with a seal member in the coolant passage.SOLUTION: A male screw that can be screw-coupled with a female screw formed in a tool holder inner peripheral surface part 21e is formed in a coolant hose outer peripheral surface part 72a. An O ring 80 is inserted into a recess 74 formed in a coolant hose outer peripheral surface part 72c. An annular member 100 is disposed outside the O ring 80. When a coolant hose 70 is moved to an axial tip side by a fastening tool 200, the annular member 100 abuts against a tool holder inner peripheral surface part 21g. Thus, the O ring 80 is disposed between a coolant hose 70 and a tool holder inner peripheral surface part 21f. An O ring 300 inserted into a recess 205 of the fastening tool 200 is disposed inside the annular member 100, and the annular member 100 is held by the O ring 300.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a coolant hose installation aid used when installing a coolant hose in a coolant passage provided in a tool holder, and a coolant hose installation method. [Background technology]

[0002] When a workpiece (a workpiece) is machined using a machine tool, a tool holder is used to hold the tool. The tool holder is attached to the spindle of the machine tool. The tool holder is provided with an injection device that injects coolant (also called "cutting oil") at the contact point (machining section) between the tool blade and the workpiece to reduce friction between the tool blade and the workpiece during machining, prevent heat generation due to friction between the tool blade and the workpiece, and discharge (clean) chips generated during machining. The machine tool is provided with a coolant supply device that supplies coolant to the tool holder. The tool holder is also provided with a coolant passage that channels the coolant supplied from the coolant supply device to the injection device. The coolant passage is formed by the inner wall surface of the coolant passage and is open at the rear end in the axial direction. A coolant hose is attached to the coolant passage of the tool holder to connect the coolant supply device provided on the machine tool side to the coolant passage. For example, the coolant hose disclosed in Patent Document 1 (JP 2009-285767 A) is attached to the coolant passage. The coolant hose disclosed in Patent Document 1 is attached to the inner wall surface of the coolant passage at a location on the rear end side in the axial direction of the coolant passage and is sealed at a location on the front end side in the axial direction.

[0003] Meanwhile, in recent years, ISO 26623 has proposed that the coolant hose be attached to the inner wall surface of the coolant passage at its axial leading end and sealed at its axial trailing end. When installing the proposed coolant hose into the coolant passage, a coolant hose installation aid is used. Figures 11 to 15 show a method of installing a coolant hose into the coolant passage using a conventional coolant hose installation aid. 12, the main body 20 of the tool holder 10 is provided with a main body inner space 23 used as a coolant passage. The main body inner space (coolant passage) 23 is defined by a main body inner circumferential surface (coolant passage inner wall surface) 21. The main body inner circumferential surface (coolant passage inner wall surface) 21 includes main body inner circumferential surface portions (coolant passage inner wall surface portions) 21d to 21i. A female thread is formed in the main body inner circumferential surface portion 21e. 13, the coolant hose 70 attached to the main body inner space (coolant passage) 23 has a coolant hose inner space 73 that communicates in the axial direction, and a coolant hose outer peripheral surface 72. The coolant hose outer peripheral surface 72 includes a coolant hose outer peripheral surface portion 72a that has a male thread that can be threadably coupled to a female thread formed on the main body inner peripheral surface portion 21e, and a coolant hose outer peripheral surface portion 72c that has a circumferentially extending recess 74. An O-ring 80 used as a sealing member is inserted into the recess 74.

[0004] The conventional coolant hose installation aid includes an annular member 400 and a wrench 500 used as a tightening tool. The coolant hose 70 is attached to the inside of the main body inner space 23 in the following procedure. First, the O-ring 80 is inserted into the recess 74 of the coolant hose 70 (see FIG. 11). Next, the annular member 400 is placed on the outside of the O-ring 80 (see FIG. 11). At this time, the O-ring 80 is compressed radially inward by the annular member 400. As a result, the O-ring 80 is elastically deformed so that its outer diameter becomes smaller than the inner diameter of the main body inner circumferential surface portion 21f. The annular member 100 is held on the outside of the O-ring 80 by the elastic force of the O-ring 80. Next, the wrench 500 and the coolant hose 70 are connected so that the wrench outer circumferential surface 502 of the wrench 500 and the coolant hose outer circumferential surface portion 72c of the coolant hose 70 approach each other in the axial direction (see FIGS. 11 and 12). Next, with the wrench 500 and the coolant hose 70 connected, the wrench 500 is moved toward the axial tip (toward arrow X) and rotated to one side about the axis (toward arrow Z1), so that the coolant hose 70 is inserted into the main body inner space 23 and rotated to one side about the axis (see Figures 12 and 13). As the coolant hose 70 moves axially toward the tip end within the main body inner space 23 and rotates to one side around the axis, the male thread formed on the outer peripheral surface portion 72a of the coolant hose is threadedly connected to the female thread formed on the inner peripheral surface portion 21e of the main body (see Figure 13). When the annular member 400 comes into contact with the main body inner circumferential surface portion 21g, the movement of the annular member 400 toward the tip side in the axial direction is restricted (see FIG. 13). Here, the outer diameter of coolant hose outer peripheral surface portion 72c of coolant hose 70 is set smaller than the inner diameter of main body inner peripheral surface portion 21f. Furthermore, the outer diameter of wrench outer peripheral surface 502 of wrench 500 is set equal to or smaller than the outer diameter of coolant hose outer peripheral surface portion 72c. Therefore, with annular member 400 abutting main body inner peripheral surface portion 21g, coolant hose 70, O-ring 80, and wrench 500 move toward the tip in the axial direction. In other words, O-ring 80 is positioned in a compressed state between coolant hose 70 and main body inner peripheral surface portion 21f (see FIG. 14). The inner diameter of the annular member inner peripheral surface 401 of the annular member 400 is set smaller than the inner diameter of the main body inner peripheral surface portion 21f. This prevents the O-ring 80 inserted in the recess 74 of the coolant hose 70 from coming into contact with the connection portion (edge) between the main body inner peripheral surface portions 21f and 21g when the O-ring 80 moves toward the tip in the axial direction. In other words, damage to the O-ring 80 due to contact between the O-ring 80 and the edge can be prevented. Next, the wrench 500 is moved to the rear end side in the axial direction (the side indicated by the arrow Y) and pulled out from the main body inner space 23 (see FIG. 15). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-285767 Summary of the Invention [Problem to be solved by the invention]

[0006] By using a conventional coolant hose installation aid, the coolant hose can be installed in the coolant passage together with the seal member while preventing damage to the seal member. However, when using conventional coolant hose attachment aids, the annular member may be left inside the coolant passage, which may damage a coolant supply device or the like installed on the machine tool when the tool holder is attached to the machine tool. An object of the present disclosure is to disclose a technique for preventing an annular member constituting a coolant hose installation aid from being left inside a coolant passage. [Means for solving the problem]

[0007] The first disclosure relates to a coolant hose installation aid used when installing a coolant hose together with a seal member in a coolant passage provided in, for example, a main body of a tool holder. The coolant passage, to which the coolant hose is attached, is defined by the inner wall surface of the coolant passage, extends in the axial direction, and is open at its rear end in the axial direction. The coolant hose is inserted into the coolant passage from the rear end in the axial direction. The inner wall surface of the coolant passage includes first to fourth inner wall surface portions of the coolant passage. The first inner wall surface portion of the coolant passage extends in the axial direction, has an inner diameter A1, and has a female thread formed thereon. The second inner wall surface portion of the coolant passage is disposed on the axially rear end side of the first inner wall surface portion of the coolant passage, extends in the axial direction, and has an inner diameter A2 (A1 < A2) larger than the inner diameter A1. The third inner wall surface portion of the coolant passage is disposed on the axially rear end side of the second inner wall surface portion of the coolant passage, extends in the axial direction, and has an inner diameter A3 (A2 < A3) larger than the inner diameter A2. The fourth inner wall surface portion of the coolant passage is disposed between the second inner wall surface portion of the coolant passage (the end portion on the axially rear end side) and the third inner wall surface portion of the coolant passage (the end portion on the axially front end side), and extends in the radial direction intersecting the axial direction. The coolant hose attached in the coolant passage extends in the axial direction and has an outer peripheral surface of the coolant hose, an inner peripheral surface of the coolant hose, and a through hole formed by the inner peripheral surface of the coolant hose and penetrating in the axial direction. The outer peripheral surface of the coolant hose includes a first outer peripheral surface portion of the coolant hose and a second outer peripheral surface portion of the coolant hose disposed on the axially rear end side of the first outer peripheral surface portion of the coolant hose. The first outer peripheral surface portion of the coolant hose extends in the axial direction, has an outer diameter B1, and has a male thread that can be screwed with the female thread formed on the first inner wall surface portion of the coolant passage. The second outer peripheral surface portion of the coolant hose extends in the axial direction, has an outer diameter B 2 (B1 < B2 < A2) that is larger than the outer diameter B1 of the first outer peripheral surface portion of the coolant hose and smaller than the inner diameter A2 of the second inner wall surface portion of the coolant passage. Further, a first recess that opens radially outward and extends in the circumferential direction is formed in the second outer peripheral surface portion of the coolant hose. The cross-sectional shape of the first recess parallel to the axial direction can be set as appropriate. The sealing member that seals between the coolant hose and the inner wall surface of the coolant passage is formed in an annular shape from an elastic material and can be inserted into the first recess. Further, the sealing member is configured such that the outer diameter C1 in a state of being inserted into the first recess is larger than the inner diameter A2 of the inner wall surface portion of the second coolant passage (A2 < C1). The coolant hose attachment auxiliary tool of the present disclosure includes an annular member, a tightening tool, and a holding member. The annular member is formed in a cylindrical shape extending in the axial direction, and has an annular member front end surface, an annular member rear end surface, an annular member inner peripheral surface, an annular member outer peripheral surface, and an annular member inner side space formed by the annular member inner peripheral surface. The annular member inner peripheral surface extends in the axial direction and has an inner diameter D2 (B2 < D2) larger than the outer diameter B2 of the outer peripheral surface portion of the second coolant hose. The annular member outer peripheral surface extends in the axial direction and has an outer diameter D1 (A2 < D1 < A3) larger than the inner diameter A2 of the inner wall surface portion of the second coolant passage and smaller than the inner diameter A3 of the inner wall surface portion of the third coolant passage. The tightening tool extends in the axial direction and has a tightening tool front end surface and a tightening tool outer peripheral surface. The tightening tool outer peripheral surface includes a first tightening tool outer peripheral surface portion disposed on the axial direction front end side. The first tightening tool outer peripheral surface portion extends in the axial direction and has an outer diameter E1 (E1 ≦ B2) not larger than the outer diameter B2 of the outer peripheral surface portion of the second coolant hose. Further, a second recess that opens radially outward and extends in the circumferential direction is formed in the first tightening tool outer peripheral surface portion. The holding member is formed in an annular shape from an elastic material and can be inserted into the second recess. Further, the holding member is configured such that the outer diameter F1 in a state of being inserted into the second recess is larger than the inner diameter D2 of the annular member inner peripheral surface (D2 < F1). Then, the tightening tool is configured to be movable along the axial direction toward the axial direction front end side with the coolant hose in a state where the first tightening tool outer peripheral surface portion and the outer peripheral surface portion of the second coolant hose are brought close to each other in the axial direction, and is also configured to be rotatable about the axis. Also, when the coolant hose moves axially toward the axial front end side while the male screw formed on the outer peripheral surface portion of the first coolant hose is screwed to the female screw formed on the inner wall surface portion of the first coolant passage within the coolant passage, the annular member front end surface abuts against the inner wall surface portion of the fourth coolant passage, so that the seal member inserted into the first recess of the coolant hose moves from the inside of the annular member toward the inner wall surface portion side of the second coolant passage, and the holding member inserted into the second recess of the tightening tool is configured to be disposed inside the annular member. By using the coolant hose attachment assist tool of the first disclosure, it is possible to prevent the annular member for preventing damage to the seal member due to contact with the inner wall surface of the coolant passage when attaching the coolant hose into the coolant passage from remaining in the coolant passage. In a different form of the coolant hose attachment assist tool of the first disclosure, the outer peripheral surface of the tightening tool further includes second and third outer peripheral surface portions of the tightening tool. The second outer peripheral surface portion of the tightening tool is disposed axially rearward of the first outer peripheral surface portion of the tightening tool and extends in the axial direction. Also, the second outer peripheral surface portion of the tightening tool has an outer diameter E3 (E1 < E3) larger than the outer diameter E1 of the first outer peripheral surface portion of the tightening tool. The third outer peripheral surface portion of the tightening tool is disposed between the first outer peripheral surface portion (the end portion on the axial rear end side) and the second outer peripheral surface portion (the end portion on the axial front end side) of the tightening tool and extends in the radial direction. In this embodiment, in a state where the annular member front end surface of the annular member abuts against the third outer peripheral surface portion of the tightening tool, the third outer peripheral surface portion of the tightening tool abuts against the annular member rear end surface of the annular member, thereby restricting the movement of the tightening tool toward the axial front end side. The second disclosure relates to a coolant hose attachment method for attaching a coolant hose together with a seal member into a coolant passage. As the coolant passage, the coolant hose, and the seal member, the coolant passage, the coolant hose, and the seal member described above are used. In addition, in the coolant hose installation method of the present disclosure, the coolant hose is installed in the coolant passage using an annular member, a fastening tool, and a retaining member. As the annular member, the above-mentioned annular member is used. As the tightening tool, the tightening tool described above is used. As the holding member, the above-mentioned holding member is used. The coolant hose installation method of the present disclosure includes the following steps. Note that a coolant hose installation method in which the following steps are combined into a single step or a single step is divided into multiple steps is also included in the coolant hose installation method of the present disclosure. [Step 1] Insert the seal member into the first recess of the coolant hose. [Step 2] An annular member is placed on the outside of the sealing member inserted into the first recess of the coolant hose. [Step 3] Insert the retaining member into the second recess of the tightening tool. [Step 4] With the outer surface of the first tightening tool and the outer surface of the second coolant hose brought closer together in the axial direction, the coolant hose is moved axially toward the tip end using the tightening tool and rotated to one side around the axis, so that the male thread formed on the outer surface of the first coolant hose is threadedly engaged with the female thread formed on the inner wall surface of the first coolant passage, while the tip end surface of the annular member is abutted against the inner wall surface of the fourth coolant passage, and the sealing member inserted in the first recess of the coolant hose is positioned inside the inner wall surface of the second coolant passage, and the retaining member inserted in the second recess of the tightening tool is positioned inside the annular member. [Step 5] With the holding member inserted into the second recess of the tightening tool positioned inside the annular member (with the annular member held in place by the elastic force of the holding member), the tightening tool is moved axially toward the rear end. By using the coolant hose installation method of the second disclosure, it is possible to prevent the annular member, which is used to prevent damage to the sealing member due to contact with the inner wall surface of the coolant passage when installing the coolant hose into the coolant passage, from being left behind in the coolant passage. [Effects of the Invention]

[0008] By using the coolant hose installation aid of the first disclosure or the coolant installation method of the second disclosure, it is possible to prevent the annular member, which is used to prevent damage to the sealing member due to contact with the inner wall surface of the coolant passage when installing the coolant hose into the coolant passage, from being left behind in the coolant passage. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 illustrates an example of a tool holder with a coolant hose mounted within a coolant passage. [Figure 2] FIG. 2 is a diagram illustrating an example of a tool holding mechanism. [Figure 3] 2 is a diagram showing a schematic configuration of a coolant passage, a coolant hose, and a coolant hose attachment aid according to an embodiment; FIG. [Figure 4] 10A to 10C are diagrams illustrating an operation of attaching a coolant hose to a coolant passage using the coolant hose attachment aid of the embodiment. [Figure 5] 10A to 10C are diagrams illustrating an operation of attaching a coolant hose to a coolant passage using the coolant hose attachment aid of the embodiment. [Figure 6] 10A to 10C are diagrams illustrating an operation of attaching a coolant hose to a coolant passage using the coolant hose attachment aid of the embodiment. [Figure 7] 10A to 10C are diagrams illustrating an operation of attaching a coolant hose to a coolant passage using the coolant hose attachment aid of the embodiment. [Figure 8]10A to 10C are diagrams illustrating an operation of attaching a coolant hose to a coolant passage using the coolant hose attachment aid of the embodiment. [Figure 9] 10A to 10C are diagrams illustrating an operation of attaching a coolant hose to a coolant passage using the coolant hose attachment aid of the embodiment. [Figure 10] 10A to 10C are diagrams illustrating an operation of attaching a coolant hose to a coolant passage using the coolant hose attachment aid of the embodiment. [Figure 11] 10A and 10B are diagrams illustrating the operation of attaching a coolant hose to a coolant passage using a conventional coolant hose attachment aid. [Figure 12] 10A and 10B are diagrams illustrating the operation of attaching a coolant hose to a coolant passage using a conventional coolant hose attachment aid. [Figure 13] 10A and 10B are diagrams illustrating the operation of attaching a coolant hose to a coolant passage using a conventional coolant hose attachment aid. [Figure 14] 10A and 10B are diagrams illustrating the operation of attaching a coolant hose to a coolant passage using a conventional coolant hose attachment aid. [Figure 15] 10A and 10B are diagrams illustrating the operation of attaching a coolant hose to a coolant passage using a conventional coolant hose attachment aid. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a coolant hose installation aid and a coolant hose installation method according to the present disclosure will be described with reference to the drawings. In this specification, the extension direction of the center line P of the main body 20 of the tool holder 10 (when the main body 20 rotates, the center line of rotation) is referred to as the "axial direction." Along the extension direction (axial direction) of the center line P, the side to which the coolant hose 70 is attached (the side attached to the machine tool) (the side indicated by arrow Y) is referred to as the "other axial side," or the "rear end side in the axial direction," or the "rear end side," and the side opposite to the side to which the coolant hose 70 is attached (the side attached to the machine tool) (the side indicated by arrow X) is referred to as the "one axial side," or the "tip side in the axial direction," or the "tip side." Also, when viewed in a cross section perpendicular to the extension direction (axial direction) of the center line P, the direction along the circle centered on the center line P is called the "circumferential direction," and the direction of the line passing through the center line P is called the "radial direction." With regard to other components, the terms "axial direction," "circumferential direction," and "radial direction" correspond to the state in which they are attached to the main body 20, or the state in which they are positioned relative to the main body 20 when attaching the coolant hose 70 to the main body 20. Of course, the definition of each direction can be changed as appropriate.

[0011] An example of a tool is shown in Figures 1 and 2. Figure 1 shows an example tool holder 10. The tool holder 10 is composed of a main body 20, a collet 30, a retainer 40, a fastening member 50, a steel ball 60, a coolant hose 70, an O-ring 80, and the like.

[0012] As shown in Figure 1, the main body 20 is formed in a cylindrical shape extending in the axial direction, and has a main body tip surface 20A, a main body rear end surface 20B, a main body inner surface 21 that forms the main body inner space 23, and a main body outer surface 22. The main body inner circumferential surface 21 includes main body inner circumferential surface portions 21a to 21i. The main body inner peripheral surface portion 21a is formed into a tapered surface in which the inner diameter decreases from the axial leading end side toward the axial rear end side. The main body inner peripheral surface portion 21a is formed so as to be tapered and fit onto the collet outer peripheral surface portion 32e of the collet 30, which will be described later. As shown in Fig. 3, the inner peripheral surface portions 21e, 21f, and 21h of the main body portion extend in the axial direction and have inner diameters A1, A2, and A3, respectively. The inner diameter A2 is set larger than the inner diameter A1 (A1 < A2), and the inner diameter A3 is set larger than the inner diameter A2 (A2 < A3). Further, the inner peripheral surface portion 21g of the main body portion is connected to the end portion on the rear end side in the axial direction of the inner peripheral surface portion 21f of the main body portion and the end portion on the front end side in the axial direction of the inner peripheral surface portion 21h of the main body portion, and extends in the radial direction intersecting the axial direction. The inner peripheral surface portion 21i of the main body portion is formed such that a member for attaching the tool holder 10 to the spindle of the machine tool can be engaged. On the inner peripheral surface portion 21e of the main body portion, there is formed a female screw that can be screwed together with a male screw formed on the outer peripheral surface portion 72a of the coolant hose 70, which will be described later. The outer peripheral surface 22 of the main body portion includes outer peripheral surface portions 22a to 22g. On the outer peripheral surface portion 22a of the main body portion, there is formed a male screw that can be screwed together with a female screw formed on the inner peripheral surface portion 51c of the fastening member 50, which will be described later. The outer peripheral surface portion 22g of the main body portion is formed as a tapered surface whose outer diameter decreases from the front end side in the axial direction toward the rear end side in the axial direction. The outer peripheral surface portion 22g of the main body portion is formed so as to be tapered and fitted to the tapered surface of the machine tool.

[0013] In the present embodiment, the inner space 23 of the main body portion corresponds to the "coolant passage" of the present disclosure, and the inner peripheral surface 21 of the main body portion corresponds to the "inner wall surface of the coolant passage" of the present disclosure. Further, the inner peripheral surface portion 21e of the main body portion corresponds to the "first inner wall surface portion of the coolant passage" of the present disclosure, the inner peripheral surface portion 21f of the main body portion corresponds to the "second inner wall surface portion of the coolant passage" of the present disclosure, the inner peripheral surface portion 21h of the main body portion corresponds to the "third inner wall surface portion of the coolant passage" of the present disclosure, and the inner peripheral surface portion 21g of the main body portion corresponds to the "fourth inner wall surface portion of the coolant passage" of the present disclosure.

[0014] Fig. 2 shows the tool holding mechanism of the tool holder 10. The tool holding mechanism shown in Fig. 2 is composed of a collet 30, a retainer 40, a fastening member 50, steel balls 60, and the like. Collet 30 is formed in a cylindrical shape extending in the axial direction, and has collet front end surface 30A, collet rear end surface 30B, collet inner peripheral surface 31 which forms collet inner space 33, and collet outer peripheral surface 32. Collet inner peripheral surface 31 includes collet inner peripheral surface portions 31a to 31c. Collet inner peripheral surface portions 31a and 31c extend in the axial direction, and collet inner peripheral surface portion 31b extends in the radial direction. Collet inner peripheral surface portions 31a and 31b form a first collet inner space portion having a circular cross section, and collet inner peripheral surface portion 31c forms a second collet inner space portion having a circular or polygonal cross section. The shape of collet inner space 33 can be changed as needed. Collet outer peripheral surface 32 includes collet outer peripheral surface portions 32a to 32e. Collet outer peripheral surface portion 32a is formed into a tapered surface whose outer diameter increases from the axial leading end side toward the axial rear end side, and is formed so as to be capable of tapered fitting with retainer inner peripheral surface portion 41a of retainer 40, which will be described later. Collet outer peripheral surface portions 32b to 32d form a recess 34 that extends circumferentially and is open radially outward. A protrusion 44 of a retainer 40, which will be described later, is inserted into recess 34. Collet outer peripheral surface portion 32e is formed into a tapered surface in which the outer diameter decreases from the axial leading end side toward the axial rear end side, and collet outer peripheral surface portion 32e is formed so as to be capable of tapered fit with main body inner peripheral surface portion 21a.

[0015] The collet 30 also has a plurality of slits. The multiple slots include multiple first slots 35 extending axially from the collet rear end face 30B toward the collet front end face 30A, and multiple second slots 36 extending axially from the collet front end face 30A toward the collet rear end face 30B. The first slots 35 open to the collet rear end face 30B, the collet inner peripheral surface 31, and the collet outer peripheral surface 32. The second slots 36 open to the collet front end face 30A, the collet inner peripheral surface 31, and the collet outer peripheral surface 32. The first slots 35 and the second slots 36 are spaced equally apart along the circumferential direction. The first slots 35 and the second slots 36 are alternately spaced along the circumferential direction. The number of first slots 35 and second slots 36 can be changed as needed. The collet front end surface 30A is fixed by the plurality of first slots 35, and a plurality of first divided pieces having free ends on the collet rear end surface 30B side are formed. The collet rear end surface 30B is fixed by the plurality of second slots 36, and a plurality of second divided pieces having free ends on the collet front end surface 30A side are formed. Furthermore, a plurality of communication holes 37 are provided in the collet inner peripheral surface 31 (more specifically, the collet inner peripheral surface portion 31a) to communicate between the first slots 35 and the collet tip end surface 30A. When a tool is held in the collet inner space 33, the coolant passes through the first slot 35 and the communication hole 37 and sprays out from the opening in the collet tip end surface 30A.

[0016] The retainer 40 is formed in a cylindrical shape extending in the axial direction, and has a retainer front end surface 40A, a retainer rear end surface 40B, a retainer inner peripheral surface 41 that forms a retainer inner space 43, and a retainer outer peripheral surface . The retainer inner peripheral surface 41 includes retainer inner peripheral surface portions 41a to 41e. The retainer inner peripheral surface portion 41a is formed into a tapered surface whose inner diameter increases from the axial leading end side toward the axial rear end side. The inner peripheral surface portion 41a is formed so as to be capable of tapered fitting with the collet outer peripheral surface portion 32a. The retainer inner peripheral surface portion 41a forms a retainer inner space portion 43a. The retainer inner peripheral surface portions 41b to 41d form a recess 43c that extends in the circumferential direction and is open radially inward. Retainer inner peripheral surface portions 41d, 41e and retainer rear end face 40B form protrusion 44 that extends circumferentially and protrudes radially inward. Retainer inner peripheral surface portion 41e forms retainer inner space portion 43b.

[0017] The fastening member 50 is formed in a cylindrical shape extending in the axial direction, and has a fastening member front end surface 50A, a fastening member rear end surface 50B, a fastening member inner surface 51 that forms a fastening member inner space 53, and a fastening member outer surface 52. The fastening member inner peripheral surface 51 includes fastening member inner peripheral surface portions 51a to 51c. The retainer 40 is inserted into a fastening member inner space portion formed by the fastening member inner peripheral surface portions 51a and 51b. The fastening member inner peripheral surface portion 51c forms a fastening member inner space portion 53b. A steel ball 60 is disposed between the outer peripheral surface 42 of the retainer and the inner peripheral surface portion 53a of the fastening member.

[0018] The retainer 40 and the fastening member 50 are assembled with the steel balls 60 interposed therebetween. The collet tip surface 30A of the collet 30 is inserted into the retainer inner space 43a via the fastening member inner space 53b and the retainer inner space 43b. When the collet outer peripheral surface 32a passes over the protrusion 44 of the retainer 40, the divided pieces are pressed radially inward by the protrusion 44, causing them to elastically deform radially inward. With the collet 30, retainer 40, clamping member 50, and steel ball 60 assembled, the collet rear end surface 30B of the collet 30 is inserted into the main body inner space 23. In addition, the female thread formed on the clamping member inner circumferential surface portion 51c of the clamping member 50 is screwed into the male thread formed on the main body outer circumferential surface portion 22a.

[0019] The tool holding mechanism used in the tool holder 10 of the present embodiment is disclosed in, for example, Japanese Patent Application Laid-Open No. 2021-673. Note that, as the tool holding mechanism, various known tool holding mechanisms with different configurations can be used.

[0020] Next, the configuration of the coolant hose 70 attached inside the main body inner space (coolant passage) 23 will be described with reference to FIG. 4. The coolant hose 70 is formed in a cylindrical shape extending in the axial direction, and has a coolant hose front end face 70A, a coolant hose rear end face 70B, a coolant hose inner peripheral surface 71 forming a coolant hose inner space 73, and a coolant hose outer peripheral surface 72. The coolant hose inner space 73 extends in the axial direction, has an opening 73A at the coolant hose front end face 70A, and has an opening 73B at the coolant hose rear end face 70B. In the present embodiment, the coolant hose inner space 73 corresponds to the "through hole penetrating in the axial direction" of the present disclosure.

[0021] The coolant hose outer peripheral surface 72 includes coolant hose outer peripheral surface portions 72a to 72e. The coolant hose outer peripheral surface portion 72a extends in the axial direction and has an outer diameter B1. On the coolant hose outer peripheral surface portion 72a, a male screw that can be screwed with a female screw formed on the main body inner peripheral surface portion 21e is formed. The coolant hose outer peripheral surface portion 72c is disposed on the axially rear end side of the coolant hose outer peripheral surface portion 72a, extends in the axial direction, and has an outer diameter B2. The outer diameter B2 is set larger than the outer diameter B1 of the coolant hose outer peripheral surface portion 72a (B1 < B2). Further, on the coolant hose outer peripheral surface portion 72c, a recess 74 that extends in the circumferential direction and has an open outer diameter is formed. The recess 74 is formed by side surfaces 74a and 74c and a bottom surface 74b, and has a quadrangular cross section. The cross-sectional shape of the recess 74 can be set as appropriate. The coolant hose outer peripheral surface portion 72e is located on the axially rearward side of the coolant hose outer peripheral surface portion 72c, and extends in the axial direction at the radial center. Coolant hose outer peripheral surface portion 72d is connected to the axial rear end of coolant hose outer peripheral surface portion 72c and the axial front end of coolant hose outer peripheral surface portion 72e, and extends radially. The coolant hose outer peripheral surface portion 72d is formed with a plurality of holes that extend in the axial direction and open to the coolant hose outer peripheral surface portion 72d, spaced apart in the circumferential direction. In this embodiment, two holes 75, 76 are formed at positions that face each other in the circumferential direction. The hole 75 (76) is formed by a side surface 75a (76a) and a bottom surface 75b (76b) and has a circular cross section. The cross-sectional shape of the hole 75 (76) can be set as appropriate. The hole 75 (76) is formed so that a protrusion 206 (207) of a tightening tool 200, which will be described later, can be inserted therein. The coolant hose tip surface 70A and the coolant hose outer peripheral surface portions 72a to 72d form the base 70a. Furthermore, the coolant hose outer peripheral surface portion 72e forms a protrusion 70b that protrudes from the radial center of the coolant hose outer peripheral surface portion 72d toward the rear end in the axial direction. The tip surface of the protrusion 70b is the coolant hose rear end surface 70B. In other words, the coolant inner peripheral surface 71 and the coolant inner space 73 are formed inside the base 70a and the protrusion 70b.

[0022] In this embodiment, the coolant hose outer peripheral surface portion 72a corresponds to the "first coolant hose outer peripheral surface portion" of the present disclosure, the coolant hose outer peripheral surface portion 72c corresponds to the "second coolant hose outer peripheral surface portion" of the present disclosure, and the recess 74 corresponds to the "first recess" of the present disclosure. The coolant hose outer peripheral surface portion 72d corresponds to the "end surface" of this disclosure. The holes 75 and 76 correspond to the "plurality of first holes opening in the end surface" of this disclosure. The protrusion 70b corresponds to the "second protrusion protruding from the end surface" of this disclosure.

[0023] An O-ring 80, which is a sealing member, is inserted into the recess 74 of the coolant hose 70. As the O-ring 80, a known O-ring formed in a ring shape from an elastic material can be used. The O-ring 80 is disposed between the coolant hose 70 and the inner peripheral surface portion 21f of the main body portion in a state where the coolant hose 70 is attached to the inner space 23 of the main body portion (a state where the male screw formed on the outer peripheral surface portion 72a of the coolant hose and the female screw formed on the inner peripheral surface portion 21e of the main body portion are screwed together). The O-ring 80 is insertable into the recess 74 of the coolant hose 70, and in a state where the O-ring 80 is inserted into the recess 74 of the coolant hose 70, the outer diameter C1 is configured to be larger than the inner diameter A2 of the inner peripheral surface portion 21f of the main body portion (A2 < C1). Note that the outer diameter C1 in a state where the O-ring 80 is not inserted into the recess 74 may also be configured to be larger than the inner diameter A2. Thereby, when the O-ring 80 is disposed between the coolant hose 70 and the inner peripheral portion 21f of the main body portion, the O-ring 80 is compressed, so that the space between the coolant hose 70 and the inner peripheral surface portion 21f of the main body portion is sealed. The inner diameter C2 of the O-ring 80 can be set as appropriate. Preferably, the inner diameter C2 is set to be not more than the inner diameter of the recess 74 (the radial distance between the bottom surfaces 74b) B3 (C2 ≤ B3). The O-ring 80 corresponds to the "sealing member" of the present disclosure. Note that the sealing member only needs to be formed in a ring shape from an elastic material and is not limited to the O-ring 80.

[0024] Next, an embodiment of the coolant hose mounting aid of the present disclosure used when mounting the coolant hose 70 together with the O-ring 80 into the inner space 23 of the main body portion will be described. As shown in FIG. 3, the coolant hose mounting aid of one embodiment includes an annular member 100, a wrench 200 which is a tightening tool, and an O-ring 300 which is a holding member. 4 to 10, the center line Q of the coolant hose 70 and the center line R of the O-ring (sealing member) 80 coincide (including "substantially coincide") with the center line P of the main body 20 when the coolant hose 70 and the O-ring 80 are attached to the main body inner space 23. Furthermore, the center line S of the annular member 100, the center line T of the wrench (tightening tool) 200, and the center line U of the O-ring (holding member) 300 coincide (including "substantially coincide") with the center line P of the main body 20 when the coolant hose 70 and the O-ring 80 are attached to the main body inner space 23. Therefore, for ease of explanation, the center lines P, Q, R, S, and T of the respective members will be referred to as "axes" below.

[0025] As shown in Figure 4, the annular member 100 is formed in a cylindrical shape extending in the axial direction, and has an annular member front end surface 100A, an annular member rear end surface 100B, an annular member inner surface 101 that forms an annular member inner space 103, and an annular member outer surface 102. The annular member inner circumferential surface 101 includes an annular member inner circumferential surface portion 101a and an annular member inner circumferential surface portion 101b, which is located axially rearward of the annular member inner circumferential surface portion 101a. The annular member inner circumferential surface portion 101a extends in the axial direction and has an inner diameter D2. The annular member inner circumferential surface portion 101b is formed so that its inner diameter increases from the axial leading end toward the axial trailing end. The inner diameter of the axial leading end of the annular member inner circumferential surface portion 101b is D2. If the coolant hose 70 is inserted into the recess 74 of the coolant hose 70 and then inserted into the main body inner space 23, the O-ring 80 may come into contact with the connection portion (edge) of the main body inner surface portions 21f and 21g, which may result in damage to the O-ring 80. Here, if the O-ring 80 is inserted into the main body inner space 23 with the outer diameter C1 of the O-ring 80 made smaller than the outer diameter A2 of the main body inner surface portion 21f, damage to the O-ring 80 due to contact with the edge can be prevented. In this embodiment, the inner diameter D2 of the inner peripheral surface 101 of the annular member 100 (the inner peripheral surface portion 101a of the annular member) is set to be larger than the outer diameter B2 of the outer peripheral surface portion 72c of the coolant hose and smaller than the inner diameter A2 of the inner peripheral surface portion 21f of the main body portion (B2 < S2 < A2). And the annular member 80 is disposed outside the O-ring 80 inserted into the recess 74. When the annular member 100 is disposed outside the O-ring 80 inserted into the recess 74, the O-ring 80 is compressed by the inner peripheral surface 101 of the annular member (the inner peripheral surface portion 101a of the annular member), and the outer diameter C1 of the O-ring 80 becomes smaller than the inner diameter A2 of the inner peripheral surface portion 21f of the main body portion. Thereby, damage to the O-ring 80 due to contact with the edge of the inner peripheral surface of the main body portion can be prevented. Also, the outer diameter D1 of the outer peripheral surface 102 of the annular member 100 is set to be larger than the inner diameter A2 of the inner peripheral surface portion 21f of the main body portion and smaller than the inner diameter A3 of the inner peripheral surface portion 21h of the main body portion (A2 < D1 < A3). Thereby, when the coolant hose 70 is inserted into the inner space 23 of the main body portion as described later, the tip surface 100A of the annular member 100 of the annular member abuts against the inner peripheral surface portion 21g of the main body portion, and the movement of the annular member 100 in the axial direction toward the tip side is restricted. Also, in this embodiment, the inner peripheral surface 101 of the annular member 100 includes, on the rear end side in the axial direction, an inner peripheral surface portion 101b of the annular member whose inner diameter increases from the front end side in the axial direction toward the rear end side in the axial direction. Thereby, the annular member 100 can be easily disposed outside the O-ring 80 from the front end side in the axial direction. Similarly, the annular member 100 can be easily disposed outside the O-ring (holding member) 300 inserted into the recess 205 of the tightening tool 200, which will be described later, from the front end side in the axial direction.

[0026] The wrench 200 is a tightening tool for moving the coolant hose 70 in the axial direction toward the front end side along the axial direction and rotating it on one side around the axis to screw-connect the male screw formed on the outer peripheral surface portion 72a of the coolant hose to the female screw formed on the inner peripheral surface portion 21e of the main body portion. As shown in FIG. 5, the wrench 200 extends in the axial direction and has a wrench front surface 200A, a wrench rear surface 200B, a wrench inner peripheral surface 201 that forms a hole 203, and a wrench outer peripheral surface 202. Wrench outer peripheral surface 202 includes wrench outer peripheral surface portions 202a to 202e. The wrench outer peripheral surface portion 202a is located on the axial tip side, extends in the axial direction, and has an outer diameter E1. The wrench outer peripheral surface portion 202a also has a recess 205 that extends in the circumferential direction and opens radially outward. The recess 205 is formed by side surfaces 205a and 205c and a bottom surface 205b and has a circular cross section. The cross-sectional shape of the recess 205 can be set as appropriate. The wrench outer peripheral surface portion 202c is located rearward of the wrench outer peripheral surface portion 202a in the axial direction, extends in the axial direction, and has an outer diameter E3. The outer diameter E3 is set to be larger than the outer diameter E1 of the wrench outer peripheral surface portion 202a (E1 <E3)されている。 The wrench outer peripheral surface portion 202b is connected to the rear end of the wrench outer peripheral surface portion 202a in the axial direction and the front end of the wrench outer peripheral surface portion 202c in the axial direction, and extends radially. The wrench outer peripheral surface portions 202a and 102b form a notch 204 that extends in the circumferential direction and is open on the axial tip side and the radial outer periphery side. The outer diameter E1 of the wrench outer peripheral surface portion 202a is set to be equal to or smaller than the outer diameter B2 (E1≦B2) of the coolant hose outer peripheral surface portion 72c of the coolant hose 70. Preferably, the outer diameter E1 is set to be slightly smaller than the outer diameter B2. A hole 203 extending in the axial direction and opening to the wrench tip surface 200A is formed in the radial center of the wrench tip surface 200A by the wrench inner peripheral surface 201. The hole 203 is formed so that the protrusion 70b of the coolant hose 70 can be inserted therein. Additionally, the wrench tip surface 200A is provided with a plurality of protrusions that protrude from the wrench tip surface 200A toward the axial tip end, radially outward (radially outward from the hole 203) and spaced apart in the circumferential direction. In this embodiment, two protrusions 206, 207 are provided at positions that face each other in the circumferential direction. The protrusion 206 (207) is formed by a side surface 206a (207a) and a top surface 206b (207b) and has a circular cross section. The cross-sectional shape of the protrusion 206 (207) can be set as appropriate. The wrench 200 also has a handle 210 for rotating the wrench 200 about its axis.

[0027] In this embodiment, the wrench 200 corresponds to the "tightening tool" of the present disclosure. Note that the tightening tool that moves the coolant hose 70 along the axial direction toward the tip end in the axial direction and rotates it around the axis is not limited to a wrench. Wrench outer peripheral surface 202 corresponds to the "tightening tool outer peripheral surface" of the present disclosure. Wrench outer peripheral surface portion 202a corresponds to the "first tightening tool outer peripheral surface portion" of the present disclosure, wrench outer peripheral surface portion 202c corresponds to the "second tightening tool outer peripheral surface portion" of the present disclosure, and wrench outer peripheral surface portion 202b corresponds to the "third tightening tool outer peripheral surface portion" of the present disclosure. The recess 205 corresponds to the "second recess" of the present disclosure. The protrusions 206 and 207 correspond to the "plurality of first protrusions" of the present disclosure. Hole 203 corresponds to the "second hole" of the present disclosure.

[0028] A holding member for holding the annular member 100 is inserted into a recess 205 formed in the outer circumferential surface portion 202a of the wrench 200. In this embodiment, the holding member is an O-ring 300 that is made of an elastic material and has an annular shape, and that can be inserted into the recess 205. As the O-ring 300, an O-ring made of a known elastic material can be used. The O-ring 300 is configured such that when it is inserted into the recess 205 of the tightening tool 200, the outer diameter F1 is larger than the inner diameter D2 of the annular member inner peripheral surface 101 (annular member inner peripheral surface portion 101a) of the annular member 100 (D2 < F1). It should be noted that the outer diameter F1 of the O-ring 300 when it is not inserted into the recess 205 can also be configured to be larger than the inner diameter D2. As a result, when the O-ring 300 is disposed inside the annular member 100, the O-ring 300 is compressed by the annular member inner peripheral surface 101. That is, the annular member 100 is held by the elastic force of the O-ring 300 inserted into the recess 205. The inner diameter F2 of the O-ring 300 can be set as appropriate. Preferably, the inner diameter F2 is set to be equal to or less than the inner diameter of the recess 205 (the radial distance between the bottom surfaces 205b) E2 (F2 ≤ E2). The O-ring 300 corresponds to the "holding member" of the present disclosure. It should be noted that the holding member only needs to be formed in an annular shape by an elastic material and is not limited to the O-ring 300.

[0029] Next, the operation of attaching the coolant hose 70 and the O-ring 80 to the inner space (coolant passage) 23 of the main body using the coolant attachment auxiliary tool of the present disclosure will be described with reference to FIGS. 3 to 10. It should be noted that the following operation corresponds to one embodiment of the coolant hose attachment method of the present disclosure.

[0030] [Step 1] As shown in FIGS. 3, 4, and 6, insert the O-ring 80 into the recess 74 of the coolant hose 70. [Step 2] As shown in FIGS. 3, 4, and ⑥, dispose the annular member 100 outside the O-ring 80 inserted into the recess 74 of the coolant hose 70. When the annular member 100 is disposed outside the O-ring 80, the O-ring 80 is compressed by the annular member inner peripheral surface 101 (annular member inner peripheral surface portion 101a), and the outer diameter becomes smaller than the inner diameter A2 of the inner peripheral surface portion 21f of the main body. Also, the annular member 100 is held by the elastic force of the O-ring 80. [Step 3] As shown in FIGS. 3, 5 and 6, an O-ring 300 is inserted into the recess 205 of the wrench 200.

[0031] [Step 4] As shown in Figures 3, 6, and 7, wrench 200, in which O-ring 300 is inserted in recess 205, is connected to coolant hose 70, in which O-ring 80 is inserted in recess 54 and annular member 100 is arranged outside O-ring 80, so that the coolant hose can move axially toward the tip end and can rotate around the axis. In this embodiment, the protrusions 206, 207 of the wrench 200 are inserted into the holes 75, 76 of the coolant hose 70, and the protrusion 70b of the coolant hose 70 is inserted into the hole 202 of the tightening tool 200. In addition, the wrench tip surface 200A of the wrench 200 is brought into contact with the outer circumferential surface portion 72d of the coolant hose 70. When the wrench tip surface 200A of the wrench 200 abuts against the coolant hose outer surface portion 72d of the coolant hose 70, the wrench outer surface portion 202a and the coolant hose outer surface portion 72c approach each other in the axial direction, and the wrench 200 can move the coolant hose 70 toward the axial tip side along the axial direction. Furthermore, by inserting the protrusions 206 and 207 of the wrench 200 into the holes 75 and 76 of the coolant hose 70, the wrench outer surface portion 202a and the coolant hose outer surface portion 72c come closer to each other in the axial direction, and the wrench 200 can be used to rotate the coolant hose 70 around its axis. The "state in which the wrench outer surface portion 202a and the coolant hose outer surface portion 72c approach each other in the axial direction" indicates "a state in which, when the wrench 200 and the coolant hose 70 move toward the tip in the axial direction, a smooth transition can be made from a state in which the annular member 100 is positioned outside the O-ring 80 inserted in the recess 74 formed in the coolant hose outer surface portion 72c to a state in which the annular member 200 is positioned outside the O-ring 300 inserted in the recess 205 formed in the wrench outer surface portion 202a." With the wrench 200 connected to the coolant hose 70, the wrench 200 is moved axially toward the tip, thereby moving the coolant hose 70 axially toward the tip and inserting it into the main body inner space 23. Then, with the wrench 200 and the coolant hose 70 connected, the wrench 200 is used to move the coolant hose 70 along the axial direction within the main body inner space 23 toward the axial tip side (arrow X side) and rotate it around the axis to one side (arrow Z1 side).

[0032] When the coolant hose outer surface portion 72a of the coolant hose 200 moves to a position corresponding to the main body inner surface portion 21e, the male thread formed on the coolant hose outer surface portion 72a is threadedly connected to the female thread formed on the main body inner surface portion 21e. Then, as shown in Figure 8, when the coolant hose 70 moves further axially toward the tip within the main body inner space 23 and the annular member tip surface 100A of the annular member 100 abuts against the main body inner surface portion 21g, the movement of the annular member 100 toward the axial tip is restricted.

[0033] 9, when the coolant hose 70 and the tightening tool 200 move further axially toward the tip end within the main body inner space 23 while the annular member 100 is restricted from moving axially toward the tip end, the O-ring 80, inserted in the recess 74 of the coolant hose 70, moves from the bottom of the annular member 100 toward the main body inner circumferential surface portion 21f. When the O-ring 80 comes out from the bottom of the annular member 100, it elastically returns to its original position and abuts against the main body inner circumferential surface portion 21f. As a result, the O-ring 80 is positioned in a compressed state between the coolant hose 70 and the main body inner circumferential surface portion 21f. Furthermore, since the coolant hose outer surface portion 72c and the tightening tool outer surface portion 202a are arranged close to each other in the axial direction, the state transitions from one in which an O-ring (sealing member) 80 is arranged inside the annular member 100 to one in which an O-ring (retaining member) 300 is arranged inside the annular member 100. The inner diameter D2 of the inner peripheral surface 101 (annular member inner peripheral surface portion 101a) of the annular member 100 is set to be smaller than the outer diameter F1 of the O-ring 300. Therefore, the O-ring 300 is compressed by the inner peripheral surface 101 (annular member inner peripheral surface portion 101a). In other words, the annular member 100 is held in place by the elastic force of the O-ring 300 inserted into the recess 205 of the tightening tool 200.

[0034] [Step 5] With the annular member 100 held by the O-ring 300 inserted in the recess 205 of the tightening tool 200, the tightening tool 200 is moved axially toward the rear end thereof, thereby releasing the connection between the tightening tool 200 and the coolant hose 70 and pulling the tightening tool 200 out of the main body inner space 23.

[0035] The coolant tightening aid of the present disclosure can also be configured as follows. "(Mode 1) A coolant hose attachment aid as described in claim 1 or 2, wherein the outer peripheral surface of the coolant hose includes an end face extending in the radial direction, and by abutting the tightening tool tip face against the end face of the coolant hose, the coolant hose can be moved along the axial direction toward the axial tip side while bringing the first tightening tool outer peripheral surface portion and the second coolant hose outer peripheral surface portion closer together in the axial direction." This can be configured as a coolant hose attachment. In this aspect, by abutting the tip surface of the tightening tool against the end surface of the coolant hose, the outer peripheral surface portion of the first tightening tool and the outer peripheral surface portion of the second coolant hose can be set in a state where they are close to each other in the axial direction. It can also be configured as "(Aspect 2) A coolant hose attachment aid according to Aspect 1, wherein the coolant hose has a plurality of first holes opening on the end surface and spaced apart in the circumferential direction, the tightening tool protrudes from the tip surface of the tightening tool toward the tip side in the axial direction, and a plurality of first protrusions insertable into each of the plurality of first holes provided in the coolant hose are spaced apart in the circumferential direction." Preferably, two first holes and two first protrusions are provided opposite to each other in the circumferential direction. In this aspect, the coolant hose can be easily rotated by the tightening tool. It can also be configured as "(Aspect 3) A coolant hose attachment aid according to aspect 1 or 2, wherein the coolant hose has a second protrusion at its radial center that protrudes from the end face toward the rear end in the axial direction, and the tightening tool has a second hole at its radial center that opens at the tip end face of the tightening tool and into which the second protrusion of the coolant hose can be inserted." In this aspect, even if a second protrusion is provided on the coolant hose, the outer surface portion of the first tightening tool and the outer surface portion of the second coolant hose can be easily set to be close to each other in the axial direction. It can also be configured as "(Aspect 4) A coolant hose attachment aid as described in any of claims 1, 2, and aspects 1 to 3, wherein the inner surface of the annular member includes a first annular member inner surface portion and a second annular member inner surface portion that is positioned further rearward in the axial direction than the first annular member inner surface portion, the first annular member inner surface portion extending in the axial direction and having the inner diameter (D2), and the second annular member inner surface portion having an inner diameter that increases from the axial tip side toward the axial rear end side." In this embodiment, the annular member can be easily disposed on the outside of the sealing member or the holding member.

[0036] The coolant tightening aid or coolant tightening method of the present disclosure is not limited to the configurations described in the embodiments, and various modifications, additions, and deletions are possible. The configurations of the coolant hose and the tightening tool are not limited to those described in the embodiment. The sealing member that seals the coolant hose and the inner wall surface of the coolant passage is not limited to an O-ring. The configuration of the annular member disposed outside the sealing member is not limited to the configuration described in the embodiment. For example, an annular member having an inner peripheral surface including an inner peripheral surface portion (101a) of the annular member with an inner diameter D2 and an inner peripheral surface portion (101b) of the annular member whose inner diameter increases from the leading end in the axial direction to the rear end in the axial direction is used, but the inner peripheral surface portion (101b) of the annular member whose inner diameter increases from the leading end in the axial direction to the rear end in the axial direction may be omitted. The holding member that holds the annular member is not limited to an O-ring. The method of connecting the tightening tool and the coolant hose so that the outer surface portion of the coolant, in which the recess into which the sealing member is inserted is formed, and the outer surface portion of the tightening tool, in which the recess into which the holding member is inserted is formed, approach each other along the axial direction is not limited to the method described in the embodiment. The method of moving the coolant hose axially toward the tip end is not limited to the method described in the embodiment (the method of abutting the tip end surface of the tightening tool against the end face of the coolant hose). The method of rotating the coolant hose around its axis is not limited to the method described in the embodiment (a method in which one of the coolant hose and the tightening tool is provided with multiple protrusions spaced apart in the circumferential direction, and the other is inserted into multiple holes spaced apart in the circumferential direction). Each of the configurations described in the embodiments can be used alone, or a plurality of appropriately selected configurations can be used in combination. [Explanation of symbols]

[0037] 10 Tool holder 20 Main body 20A Main body tip 20B Main body rear end surface 21 Inner surface of main body (inner wall surface of coolant passage) 21a to 21i: Inner surface of main body (inner wall surface of coolant passage) 22 Outer surface of main body 22a~22g Outer surface of main body 23 Main body inner space (coolant passage) 30 Colette 30A collet tip surface 30B collet rear end face 31 Collet inner surface 31a to 31c: Collet member inner peripheral surface portion 32 Collet outer surface 32a~32e Collet outer surface 33 Collet inner space 34 Recess 35, 36 Slit 37 Communication hole 40 Retainer 40A Retainer tip surface 40B Retainer rear end surface 41 Inner surface of retainer 41a~41e Inner peripheral surface of retainer 42 Retainer outer surface 43 Retainer inner space 43a~43c Retainer inner space part 50 Fastening member 50A Fastening member tip surface 50B Rear end face of fastening member 51 Inner surface of fastening member 51a to 51c: inner peripheral surface portion of fastening member 52 outer surface of fastening member 53 Space inside fastening member 53a, 53b: Space inside the fastening member 60 Steel Balls 70 Coolant hose 70A coolant hose tip 70B Coolant hose rear end 70a base 70b protrusion (second protrusion) 71 Inner surface of coolant hose 72 Coolant hose outer surface 72a~72e Coolant hose outer surface 73 Coolant hose inner space (communication hole) 73A, 73B opening 74 Recess (first recess) 74a, 74c side 74b Bottom Holes 75 and 76 (first holes) 75a, 76a side 75b, 76b bottom 80 sealing material 83 Space inside the seal member 100, 400 Annular members 100A, 400A Annular member tip surface 100B, 400B Annular member rear end surface 101, 401 Inner surface of annular member 101a, 101b, 401a, 401b Inner peripheral surface portion of annular member 102, 402 Outer surface of annular member 200, 500 wrenches (tightening tools) 200A, 500A Wrench tip surface (tightening tool tip surface) 200B, 500B Wrench rear end surface (Tightening tool rear end surface) 201, 501 Wrench inner surface (tightening tool inner surface) 202, 502 Wrench outer surface (tightening tool outer surface) 202a~202e Wrench outer surface part (tightening tool outer surface part) 203, 503 holes (second holes) 204 Notch 205 Recess 205a, 205c side 205b Bottom 206, 207, 506, 507 protrusions 206a, 207a, 506a, 507a side 206b, 207b, 506b, 507b top surface 210, 510 handle 300 Retaining member 303 Space inside the holding member

Claims

1. A coolant hose installation aid used when installing a coolant hose together with a seal member into a coolant passage of a tool holder, the coolant passage is formed by a coolant passage inner wall surface, extends in the axial direction, and is open at its axial rear end, the coolant passage inner wall surface including: a first coolant passage inner wall surface portion having an inner diameter A1 and having a female thread formed thereon; a second coolant passage inner wall surface portion located rearward in the axial direction from the first coolant passage inner wall surface portion and having an inner diameter A2 larger than the inner diameter A1 (A1<A2); a third coolant passage inner wall surface portion located rearward in the axial direction from the second coolant passage inner wall surface portion and having an inner diameter A3 larger than the inner diameter A2 (A2<A3); and a fourth coolant passage inner wall surface portion located between the second coolant passage inner wall surface portion and the third coolant passage inner wall surface portion and extending in a radial direction intersecting the axial direction. the coolant hose extends in the axial direction and has a coolant hose outer peripheral surface and a coolant hose inner peripheral surface forming a through hole that penetrates in the axial direction, the coolant hose outer peripheral surface including: a first coolant hose outer peripheral surface portion having an outer diameter B1 and formed with a male thread that can be threadably coupled with the female thread formed in the first coolant passage inner wall surface portion; and a second coolant hose outer peripheral surface portion that is located rearward in the axial direction from the first coolant hose outer peripheral surface portion, has an outer diameter B2 that is larger than the outer diameter B1 and smaller than the inner diameter A2 of the second coolant passage inner wall surface portion (B1<B2<A2), and is formed with a first recess extending in the circumferential direction, the sealing member is formed in an annular shape from an elastic material, is insertable into the first recess, and is configured such that an outer diameter C1 of the sealing member when inserted into the first recess is larger than an inner diameter A2 of the second coolant passage inner wall surface portion (A2<C1); The clamping device includes an annular member, a tightening tool, and a holding member. the annular member is formed in a cylindrical shape extending in the axial direction, and has an annular member front end surface, an annular member rear end surface, an annular member inner circumferential surface forming an annular member inner space, and an annular member outer circumferential surface, the annular member inner circumferential surface having an inner diameter D2 (B2<D2) larger than an outer diameter B2 of the second coolant hose outer circumferential surface portion, and the annular member outer circumferential surface has an outer diameter D1 (A2<D1<A3) larger than an inner diameter A2 of the second coolant passage inner wall surface portion and smaller than an inner diameter A3 of the third coolant passage inner wall surface portion, the tightening tool extends in the axial direction and has a tightening tool tip surface and a tightening tool outer peripheral surface, the tightening tool outer peripheral surface is disposed on the tip side in the axial direction, has an outer diameter E1 (E1≦B2) that is equal to or smaller than the outer diameter B2 of the second coolant hose outer peripheral surface portion, and includes a first tightening tool outer peripheral surface portion on which a second recess extending in the circumferential direction is formed, the retaining member is formed in an annular shape from an elastic material, is insertable into the second recess, and is configured such that an outer diameter F1 of the retaining member when inserted into the second recess is larger than an inner diameter D2 of the inner circumferential surface of the annular member (D2<F1); the tightening tool is configured to be able to move the coolant hose along the axial direction toward a tip end side in the axial direction and to be able to rotate around the axis while bringing the first tightening tool outer peripheral surface portion and the second coolant hose outer peripheral surface portion close to each other in the axial direction; When the coolant hose moves within the coolant passage along the axial direction of the first coolant passage toward the axial tip end while the male thread formed on the outer peripheral surface of the first coolant hose is threadedly coupled to the female thread formed on the inner wall surface of the first coolant passage, the tip end surface of the annular member abuts against the inner wall surface of the fourth coolant passage, causing the sealing member inserted in the first recess to move from the inside of the annular member toward the inner wall surface of the second coolant passage, and the retaining member inserted in the second recess to be positioned inside the fastening member. A coolant hose installation aid characterized by:

2. 2. The coolant hose installation aid according to claim 1, a second tightening tool outer peripheral surface portion that is located rearward in the axial direction from the first tightening tool outer peripheral surface portion and has an outer diameter E3 that is larger than the outer diameter E1 (E1<E3); and a third tightening tool outer peripheral surface portion that is located between the first tightening tool outer peripheral surface portion and the second tightening tool outer peripheral surface portion and extends in the radial direction.

3. A coolant hose installation method for installing a coolant hose together with a seal member into a coolant passage of a tool holder using an annular member, a fastening tool, and a holding member, comprising: the coolant passage is formed by a coolant passage inner wall surface, extends in the axial direction, and is open at its axial rear end, the coolant passage inner wall surface including: a first coolant passage inner wall surface portion having an inner diameter A1 and having a female thread formed thereon; a second coolant passage inner wall surface portion located rearward in the axial direction from the first coolant passage inner wall surface portion and having an inner diameter A2 larger than the inner diameter A1 (A2>A1); a third coolant passage inner wall surface portion located rearward in the axial direction from the second coolant passage inner wall surface portion and having an inner diameter A3 larger than the inner diameter A2 (A2<A3); and a fourth coolant passage inner wall surface portion located between the second coolant passage inner wall surface portion and the third coolant passage inner wall surface portion and extending in a radial direction intersecting the axial direction. The coolant hose extends in the axial direction and has a coolant hose outer peripheral surface and a coolant hose inner peripheral surface forming a through hole penetrating in the axial direction, the coolant hose outer peripheral surface including: a first coolant hose outer peripheral surface portion having an outer diameter B1 and formed with a male thread that can be threadably coupled with the female thread formed in the first coolant passage inner wall surface portion; and a second coolant hose outer peripheral surface portion that is located rearward in the axial direction from the first coolant hose outer peripheral surface portion, has an outer diameter B2 that is larger than the outer diameter B1 and smaller than the inner diameter A2 of the second coolant passage inner wall surface portion (B1<B2<A2), and is formed with a first recess extending in the circumferential direction, the sealing member is formed in an annular shape from an elastic material, is insertable into the first recess, and is configured such that an outer diameter C1 of the sealing member when inserted into the first recess is larger than an inner diameter A2 of the second coolant passage inner wall surface portion (A2<C1); the annular member is formed in a cylindrical shape extending in the axial direction, and has an annular member front end surface, an annular member rear end surface, an annular member inner circumferential surface forming an annular member inner space, and an annular member outer circumferential surface, the annular member inner circumferential surface having an inner diameter D2 (B2<D2) larger than an outer diameter B2 of the second coolant hose outer circumferential surface portion, and the annular member outer circumferential surface has an outer diameter D1 (A2<D1<A3) larger than an inner diameter A2 of the second coolant passage inner wall surface portion and smaller than an inner diameter A3 of the third coolant passage inner wall surface portion, the tightening tool extends in the axial direction and has a tightening tool tip surface and a tightening tool outer circumferential surface, the tightening tool outer circumferential surface is disposed on the axial tip side, has an outer diameter E1 (E1≦B2) that is equal to or smaller than the outer diameter B2 of the second coolant hose outer circumferential surface portion, and includes a first tightening tool outer circumferential surface portion on which a second recess extending in the circumferential direction is formed, the retaining member is formed in an annular shape from an elastic material, is insertable into the second recess, and is configured such that an outer diameter F1 of the retaining member when inserted into the second recess is larger than an inner diameter D2 of the inner circumferential surface of the annular member (D2<F1); inserting the seal member into the first recess of the coolant hose; disposing the annular member on the outside of the sealing member inserted into the first recess of the coolant hose; inserting the retaining member into the second recess of the fastening tool; with the first tightening tool outer peripheral surface portion and the second coolant hose outer peripheral surface portion brought close to each other in the axial direction, using the tightening tool to move the coolant hose toward the axial tip end along the axial direction and rotate it to one side about the axis, so that the male thread formed on the first coolant hose outer peripheral surface is threadedly coupled to the female thread formed on the first coolant passage inner wall surface portion while abutting the annular portion tip end surface against the fourth coolant hose inner wall surface portion, thereby arranging the seal member inserted in the first recess of the coolant hose inside the second coolant passage inner wall surface and arranging the retaining member inserted in the second recess of the tightening tool inside the annular member; moving the tightening tool along the axial direction toward a rear end thereof in a state in which the holding member inserted into the second recess of the tightening tool is disposed inside the annular member; A coolant hose installation method comprising:

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