Method for manufacturing a propeller measuring instrument

Abstract

To provide an accurate and easy-to-handle measuring instrument for a propeller manufactured by laminated molding, and to provide a manufacturing method of the propeller measuring instrument by laminated molding.SOLUTION: A measuring instrument for measuring the shape of a wing of a propeller having a cylindrical propeller boss at its center comprises an adjusting part at the time when the blade is aligned in contact with the inside of the propeller boss, a measuring part for measuring the shape of the blade, and a connecting part for connecting the adjusting part and the measuring part. The measuring part has a measuring surface abutting with the feather and a table surface having one surface as a plane.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention is a tool for pressing a measurement surface against the surface of a propeller to measure and examine whether the shape is as specified. [Background technology]

[0002] It is generally known that the shape of the propeller has a significant effect on the running performance of a boat, and in order to paddle the water efficiently, the propeller must have a specific shape that is determined hydraulically. Thin propellers in particular are prone to deformation with use, so shape adjustments are necessary frequently. When correcting the shape, the measuring surface of a measuring tool made to fit the specified shape is pressed against the propeller, and whether or not it fits tightly against the propeller is used to determine whether correction is necessary.If it does not fit tightly, the propeller is deformed with a hammer or similar tool to make the correction. Patent Document 1 describes a propeller gauge for measuring and correcting the shape of a propeller using the method described above. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-090356 A Summary of the Invention [Problem to be solved by the invention]

[0004] 3D printers, which manufacture objects by layering them, enable the production of structures with a relatively high degree of freedom in a short time, and are extremely effective in the production of so-called small-lot products. Since the preferred shape of a propeller varies depending on the user's desired feel and purpose, measuring instruments are usually produced in small lots, and additive manufacturing is preferred. On the other hand, the conventional propeller measuring tool described in Patent Document 1 had the problem that it was difficult to perform additive manufacturing due to its shape, and even if additive manufacturing was performed, it was difficult to improve accuracy.

[0005] In view of the above problems, the present invention aims to provide a highly accurate and easy-to-use measuring instrument for a propeller manufactured by additive manufacturing, and to provide a manufacturing method for a propeller measuring instrument by additive manufacturing. [Means for solving the problem]

[0006] The present invention, which solves the above-mentioned problem, is a measuring instrument for measuring the shape of the blades of a propeller having a cylindrical propeller boss at its center, and includes an adjustment unit that abuts against a part of the propeller to align it, a measurement unit that measures the shape of the blades, and a connection unit that connects the adjustment unit and the measurement unit, and the measurement unit has a measurement surface that abuts against the blades and a table surface with one side being flat. The presence of a table surface in this way increases the stability and precision of additive manufacturing, while the presence of a flat surface makes it easier to place the device when not in use, improving handling.

[0007] In a preferred embodiment of the present invention, the adjustment portion and the connection portion are located above a horizontal plane including the table surface. With this configuration, when the table is placed with the surface facing downwards, the easy-to-hold connection parts and adjustment parts used for attachment and detachment are located at the top, making it easy to pick up and use. Furthermore, even when additive manufacturing is performed using the table surface as the first layer, other components will not interfere with the stage, making manufacturing easier.

[0008] In a preferred embodiment of the present invention, the adjustment unit has an adjustment unit main body that connects to the connection unit and a shaft portion that penetrates into the propeller boss, and the shaft portion is provided so as to be removable from the adjustment unit main body. This configuration makes it easy to adjust the positional relationship between the propeller boss and the adjustment unit. In addition, the shaft, which is a protruding component of the measuring instrument, can be disassembled and stored, making it easier to store the measuring instrument. Furthermore, when measuring a propeller using multiple measuring instruments, the adjustment unit body can be removed and the shaft can be reused, reducing the number of required parts.

[0009] In a preferred embodiment of the present invention, the shaft portion has a groove in the axial direction. With this configuration, the adjustment unit is fixed to the propeller boss and the adjustment unit main body by elastic force, thereby increasing the accuracy of the positional fixing of the adjustment unit relative to the propeller.

[0010] The present invention, which solves the above-mentioned problems, is a method for manufacturing a measuring instrument, which includes a measuring unit that measures the shape of a propeller blade, and the measuring unit has a measuring surface that contacts the blade and a planar table surface with one flat surface, and is manufactured by stacking the table surface as the first layer. This method can improve the stability of additive manufacturing and increase the accuracy of the manufacturing process.

[0011] In a preferred form of the present invention, the device comprises an adjustment unit main body attached to a shaft that engages with a propeller boss, and a connection portion that connects the measurement unit and the adjustment unit main body, and the measurement unit, adjustment unit main body, and connection portion are formed integrally. By forming them integrally in this way, errors caused by the connection parts of the measuring part, the connecting part, and the adjusting part main body are eliminated, and positional accuracy can be further improved.

[0012] In a preferred embodiment of the present invention, a shaft body, which is attachable to the adjuster body and has a groove in the axial direction, is formed by laminating layers in the axial direction. By forming it in this manner, the shaft body can be manufactured at the same time. [Effects of the Invention]

[0013] The present invention, which solves the above problems, can provide a highly accurate and easy-to-use measuring instrument for a propeller manufactured by additive manufacturing, and can also provide a manufacturing method for a propeller measuring instrument by additive manufacturing. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 2 is an exploded perspective view of a measuring instrument and a propeller according to the first embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of a measuring instrument and a propeller according to the first embodiment of the present invention. [Figure 3] 1A-1C are views of a shaft according to a first embodiment of the present invention, viewed from various angles. [Figure 4] 1 is a cross-sectional view of a shaft according to a first embodiment of the present invention. [Figure 5] 1A to 1C are explanatory diagrams of a method for manufacturing a measuring instrument according to a first embodiment of the present invention. [Figure 6] FIG. 4 is a cross-sectional view of a shaft according to second and third embodiments of the present invention. [Figure 7] 10A to 10C are explanatory diagrams of a method for manufacturing a measuring instrument according to a fourth embodiment of the present invention. [Figure 8] 13A to 13C are perspective views of a measuring instrument according to a fifth embodiment of the present invention, and explanatory diagrams of a manufacturing method thereof. [Figure 9] FIG. 10 is a perspective view of a shaft according to a sixth embodiment of the present invention. [Figure 10] 10A and 10B are a cross-sectional view and a bottom view of a shaft according to a sixth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] The following describes the propeller measuring instruments according to each embodiment of the present invention with reference to the drawings. The description will be made in detail in the order of the configuration of the embodiment, the manufacturing method, the implementation method, and other examples. In the following, the symbol P represents the propeller, and the symbol X represents the measuring instrument. It should be noted that the following embodiments are merely examples of the present invention, and the present invention is not limited to the following embodiments.

[0016] First Embodiment The propeller P is composed of a cylindrical propeller boss P1 to be attached to a boat, and blades P2 attached to the outer periphery of the propeller boss P1 and having a shape suitable for paddling through water. The measuring tool X according to the present invention is used to measure whether a predetermined region P21 of a wing P2 has an appropriate shape, as shown in FIGS. The measuring instrument X includes an adjustment unit 1 that aligns with the propeller boss P1, a measurement unit 2 that measures the shape of the blade P2 by contacting the blade P2, and a connection unit 3 that connects the adjustment unit 1 and the measurement unit 2.

[0017] The adjustment unit 1 is a part that adjusts the position of the propeller P in the axial direction and the rotational direction centered on the axial direction so that the measurement unit 2 abuts the location on the blade P2 to be measured, and is composed of an adjustment unit main body 11 that connects to the connection unit 3 and a shaft portion 12 that is inserted into the propeller boss P1. Furthermore, in this embodiment, the adjustment portion main body 11 and the shaft portion 12 are provided so as to be removable. Here, Fig. 3 shows the shaft portion 12 in this embodiment as viewed from various directions. More specifically, Fig. 3(a) is a plan view, Fig. 3(b) is a front view, and Fig. 3(c) is a bottom view. Note that the front view, side view, and rear view are omitted because they are substantially the same as the front view when viewed from any direction. And Fig. 4 shows a cross-sectional view of the shaft portion 12 taken along the line Q-Q' in Fig. 3(a).

[0018] The adjustment unit main body 11 is a cylindrical part having a bottom surface, and is configured so that the shaft portion 12 can be fitted inside it and attached, as shown in Fig. 4. More specifically, a deep groove 111 is provided at the lower end of the hole in the adjustment unit main body 11 so as to correspond to the diameter and thickness of an upper end portion 122, which will be described later.

[0019] Deep groove 111 is a wide gap provided near the bottom surface of the adjuster body. The portion of this groove that contacts upper end 122 is inclined relative to the bottom surface, making installation easier. Alternatively, deep groove 111 may be provided with a protruding portion corresponding to upper side groove S1, allowing for fixation in the rotational direction.

[0020] The shaft portion 12 is a cylindrical member configured such that one end is fitted to the adjustment portion main body 11 and the other end is fitted to the propeller boss P1, and has a shaft main body 121 and an upper end portion 122 having a larger diameter than the shaft main body 121.

[0021] The shaft body 121 is formed so that its outer diameter is approximately the same as or slightly larger than the inner diameter of the propeller boss P1, and its length is at least longer than the length of the adjustment unit body 11, and preferably longer than the propeller boss P1. This allows the adjustment unit body 11 to be firmly fitted into the propeller boss P1. Preferably, the shaft body 121 is formed long enough that no part of it protrudes from the end of the propeller boss P1 when fitted into the adjustment unit body 11. As shown in FIG. 3(b), the shaft body 121 has an upper end groove 123, which is a gap portion extending from the upper end portion 122, and a lower end groove 124, which is a gap portion extending from the lower end.

[0022] Upper end portion 122 is a disk-shaped portion that protrudes from the upper portion of the shaft body by approximately 1 to 5 mm, and is formed so that its radius is approximately 1 to 3 mm larger than that of shaft body 121. Upper end groove 123 is provided so as to continue from shaft body 121.

[0023] The upper end groove 123 is composed of an upper central groove C1, which is a hole formed in the center, and an upper side surface groove S1, which is a groove formed from the side surface to the upper central groove C1. The radius of the upper central groove C1 is set to be at least larger than the difference between the radius of the upper end portion 122 and the radius of the shaft body 121, and the width of the upper side surface groove S1 is set to be at least larger than the difference between the circumferential length of the upper end portion 122 and the circumferential length of the shaft body 121. The upper side surface grooves S1 are preferably formed so that multiple grooves of the same shape are arranged at equal intervals, and more preferably, there are three or four grooves. In such a case, the width of the upper side surface grooves S1 is formed so that the total length of the widths of all the grooves is at least greater than the difference in circumferential length between the upper end portion 122 and the shaft body 121. The length of the upper end groove 123 is configured to be approximately the same as or slightly shorter than the depth of the adjuster body 11, making it easier to fit into the adjuster body 11.

[0024] The lower end groove 124 is composed of a lower central groove C2 and a lower side surface groove S2, similar to the upper end groove 123. The radius of the lower central groove C2 is set to be at least larger than the difference between the radius of the shaft main body 121 and the radius of the propeller boss P1, and the width of the lower side surface groove S2 is set to be at least larger than the difference between the circumferential length of the shaft main body 121 and the circumferential length of the propeller boss P1. Preferably, the lower side surface grooves S2 are formed so that multiple grooves are equally spaced, and more preferably, there are three or four grooves. In such a case, the width of the lower side surface grooves S2 is formed so that the total width of all grooves is at least greater than the difference in circumferential length between the upper end portion 122 and the shaft body 121. Furthermore, the length of the lower end groove 124 is configured to be approximately the same as the depth of the propeller boss P1, making it easy to fit into the propeller boss P1. Furthermore, by providing an area in the circumferential cross section of the shaft body 121 where neither the upper end groove 123 nor the lower end groove 124 is provided, the durability of the shaft body 121 is increased.

[0025] The measurement unit 2 is a plate-shaped component that includes a measurement surface 21 that measures the shape by coming into contact with the wing P2, a planar table surface 22 that is provided adjacent to the measurement surface, and a connection surface 23 that connects to the connection unit 3.

[0026] The measurement surface 21 is provided on a surface corresponding to the thickness direction when the measurement unit 2 is considered to be a plate. The adjustment unit 1 and the connection unit 3 are adapted to be capable of adjusting the position of the measurement surface 21 so that the measurement surface 21 abuts against the predetermined area P21, and the measurement surface 21 forms a measurement surface that follows the shape of the predetermined area P21. The region of the blade P2 that is the predetermined region P21 may be a region on a line extending from the propeller boss P1 to the tip of the blade P2, a region on a line perpendicular to that line, a region including a line that forms a grid when the blade P2 is viewed from above, etc. The portion that is the predetermined region is preferably about 1 to 10 cm long and 0.2 to 2 cm wide.

[0027] Table surface 22 is a surface provided adjacent to measurement surface 21 and is provided so as to be flat. In addition, when considering a horizontal plane A including table surface 22, adjustment unit 1 and connection unit 3 are both provided above so as not to interfere with horizontal plane A.

[0028] The connection surface 23 is a surface that is provided substantially parallel to the table surface 22, and the connection portion 3 is formed integrally therewith. The distance between the connection surface 23 and the table surface 22 is expected to be about 2 to 10 mm, and the surface formed between the table surface 22 and the connection surface 23 becomes the measurement surface 21.

[0029] The connecting part 3 is a rod-shaped member that connects the adjusting part 1 and the measuring part 2, and by setting it to an appropriate length, the position of the distance from the axis of the propeller P to the measuring part 2 is adjusted. The connection position of connection part 3 with measurement part 2 is preferably provided near the surface facing measurement surface 21, and the connection position with adjustment part 1 is preferably provided near the surface that is flattened on cylindrical adjustment part main body 11. This prevents connection part 3 from coming into contact with other members when measurement part 2 abuts against wing P2, making it easier for the measurement surface to abut. Additionally, connection part 3 may be provided so as to curve upward relative to wing P2. Furthermore, it is preferable that the portion where the connecting portion 3 is connected to another member is reinforced by ribbing.

[0030] A method for manufacturing the measuring instrument X of the present invention will be described below with reference to Fig. 5. The measuring instrument X is manufactured by a manufacturer. Note that the manufacturing method is not limited to the method described below, and the order of the steps may be reversed.

[0031] First, the manufacturer prepares a model propeller P' having an appropriate shape, captures the shape of the model propeller P' using a shape capture device such as a 3D scanner, and converts it into digital data.

[0032] Next, the manufacturer uses the obtained digital data to digitally create the measuring unit 2. The creation process includes the steps of creating a measurement surface 21 that conforms to the shape of the predetermined area P21 of the model propeller P', and creating a plate that includes the measurement surface 21 and the table surface 22.

[0033] Next, the manufacturer creates the adjustment section 1 and the connection section 3 digitally. The adjustment portion 1 is produced by forming a hole having approximately the same shape as the cross section of the shaft main body 121 in a columnar body having a diameter larger than the inner diameter of the propeller boss P1. Connection part 3 is created by connecting a rod-shaped member to connection surface 23 and adjustment part 1. If it is expected that connection part 3 will come into contact with wing P2 when measurement surface 21 abuts against predetermined area P21, the manufacturer will move the position where connection part 3 connects with adjustment part 1 or connection surface 23 away from measurement surface 21, or curve it so that it does not come into contact. The manufacturer also digitally creates the shaft portion 12, thereby creating 3D data of the measuring instrument X.

[0034] Next, the manufacturer outputs the 3D data using additive manufacturing with a 3D printer, preferably using PLA, ABS, or UV resin. 5, in additive manufacturing, the layers are stacked so that the first layer (the lowest layer, the part that comes into close contact with the stage 40 or raft 41) becomes the table surface 22. This prevents stacking marks from occurring in the long side direction of the adjacent measurement surfaces 21, allowing the measurement surfaces 21 and the predetermined area P21 to be in closer contact with each other, improving accuracy.

[0035] In addition, the manufacturer performs additive manufacturing using the end of the shaft portion 12 as the first layer. This makes it possible to easily form the upper end groove 123 and the lower end groove 124. Note that by creating them on the same stage 40, the manufacturing time can be shortened.

[0036] A schematic diagram of the formed measuring tool X is shown in Fig. 5. Here, Fig. 5(a) shows a perspective view of the measuring tool X formed on the stage 40, and Fig. 5(b) shows a side view thereof. As shown in Figure 5(b), when placed on the stage 40, the table surface 22 having the connection part 3 and adjustment part 1 on top becomes the first layer, thereby increasing the stability of the modeling and reducing the amount of raft 41 and support material 42 required for the modeling.

[0037] A method for implementing the present invention will be described in detail below using Figures 1 and 2. The present invention is implemented by a user who modifies the shape of the propeller P. The method for implementing the present invention is an example, and the method for implementing the present invention is not limited to this, and the order of the components may be reversed. The user performs the modification using a component (hereinafter referred to as the measuring instrument body) that combines an adjustment unit main body 11, a measurement unit 2, and a connection unit 3 that correspond to various predetermined regions P21, and a single shaft unit 12 that corresponds to the component.

[0038] First, the user fits the adjustment unit body 11 onto the upper end portion 122. In the normal state, the upper end portion 122 cannot be fitted into the adjustment unit body 11, but by applying a force inward from the side of the upper end portion 122, its diameter shrinks and it becomes possible to fit into the hole in the adjustment unit body 11. In this state, the user inserts the shaft portion 12 into the adjustment unit body 11. When the upper end portion 122 moves to the position of the deep groove 111, its elastic force engages with the deep groove 111, and the adjustment unit body 11 is fixed in the height direction.

[0039] Next, the user inserts the shaft body 121 into the propeller boss P1. Here, similar to when the shaft body 121 is inserted into the adjustment unit body 11, the shaft body 121 is compressed and deformed inward, and is tightly fitted into the propeller boss P1 by the elastic force acting outward. This fixes the shaft body 121 perpendicular to the propeller boss P1, improving positional accuracy.

[0040] Next, the user rotates measuring tool X in the axial direction so that the measurement surface 21 contacts the predetermined area P21, and performs measurement. If the measurement surface 21 is in close contact with the predetermined area P21, the propeller shape is determined to be correct and measurement at that position is terminated. On the other hand, if the measurement surface 21 is not in close contact, the user removes measuring tool X from propeller boss P1, corrects the propeller shape by hitting it with a hammer or the like, and performs measurement again using measuring tool X. The above process is repeated until the measurement surface 21 is in close contact with the predetermined area P21.

[0041] Next, the user removes the adjustment unit main body 11 from the shaft main body 121, attaches a measuring instrument main body corresponding to another predetermined position to the shaft main body 121, and uses this to adjust the propeller P. By repeating the above steps, the user can modify the shape of the blades P2 so that it has the same shape as the model propeller P'.

[0042] The above configuration makes it possible to provide a highly accurate and easy-to-use propeller measuring instrument manufactured by additive manufacturing, and to provide a method for manufacturing a propeller measuring instrument by additive manufacturing.

[0043] Another embodiment will be described in detail below with reference to Figures 6 and 7. Note that the same components as those in the first embodiment will be denoted by the same reference numerals and will not be described again. Here, FIG. 6 shows a cross-sectional view of the adjuster in the second and third embodiments in which the shapes of the adjuster body 11 and the shaft body 121 are changed, respectively. FIG. 7 shows a side view of a measuring tool X placed on a stage 40 according to the fourth embodiment.

[0044] Second Embodiment 6(a), shaft body 121 is provided with curved portion 125 that curves from below upper end portion 122 toward the axis of shaft body 121, thereby facilitating attachment to adjustment unit body 11. Furthermore, shaft body 121 is provided with lower end portion 126, which allows attachment to propeller boss P1.

[0045] The curved portion 125 has its upper end located at the lower end of the upper end portion 122, and is located at the lower end of the adjustment unit main body 11 when the lower end is attached, forming a recessed portion facing in the axial direction. By being provided around the entire circumference, it has a shape resembling a sake bottle. This makes it easy to remove the upper end portion 122.

[0046] The lower end portion 126 is a portion that protrudes radially from the lower end of the shaft body 121. The outer diameter of the lower end portion 126 is made larger than the inner diameter of the propeller boss P1, and the diameter of the lower central groove C2 and the lower side surface groove S2 are configured to have appropriate widths, as with the upper end portion 122 described above, so that the shaft portion 12 can be inserted into the propeller boss P1. Furthermore, when the shaft portion 12 is attached to the adjustment portion main body 11, the height from the lower surface of the adjustment portion main body 11 to the upper surface of the lower end portion 126 is set to be approximately the same as the height of the propeller boss P1. This makes it easy to fix the position of the propeller boss P1 at a predetermined position in the height direction.

[0047] Third Embodiment In the form shown in Figure 6(b), the adjustment unit 1 is composed of a cylindrical adjustment unit main body 11 that connects to the connection part 3, a shaft part 12 that penetrates into a hole in the adjustment unit main body 11, and an internal screw 13 that is a screw provided inside the adjustment unit main body 11.

[0048] The adjustment unit main body 11 is a generally cylindrical member with one side closed, and at the back of the open hole is provided a deep groove 111 with a larger diameter than the hole at the open surface. In addition, a protruding member that protrudes inward is provided on the periphery of the deep groove 111, and this protruding member engages with a groove provided on the side surface of the internal thread 13.

[0049] A female screw portion 127 is provided at the upper end of the shaft portion 12, and is screwed into a male screw portion 132 attached to the inside of the adjustment portion main body 11, which will be described later. A lower end portion 126 may be provided at the lower end of the shaft body 121.

[0050] The internal screw 13 is composed of a head portion 131 and a male thread portion 132 . Like the upper end 122, the head 131 has a groove that can engage with the deep groove 111, and the groove formed on the side engages with the protruding member provided in the deep groove 111, thereby fixing it in rotation in the axial direction.

[0051] The user inserts the internal screw 13 into the adjustment unit main body 11 from the head 131 to fix it, and then screws in the shaft unit 12 to form the measuring instrument X. By doing so, the adjustment unit main body 11 and the like can be rotated, replaced, and the height adjusted while the shaft portion 12 is inserted into the propeller boss P1, thereby improving handling performance.

[0052] Fourth Embodiment The plane formed on the horizontal plane A may be provided not only on the table surface 22 of the measurement unit 2 but also on the adjustment unit 1 and the connection unit 3. For example, as shown in FIG. 7, the bottom surface of the adjustment support 112 protruding from the adjustment unit 1 may be provided so as to be included in the horizontal plane A. By doing so, the stability of the additive manufacturing can be further improved and manufacturing can be made easier.

[0053] Fifth Embodiment In the present embodiment of the invention, as shown in FIG. 8, the measurement surface 21 is inclined in a direction extending outward from the table surface 22 to the connection surface 23, and the end of the inclination becomes the measurement end 211 that actually comes into contact with the specified region P21. The above-mentioned inclination is set so that the angle of the measurement surface 21 relative to the table surface 22 is acuter than the angle between the wing P2 and the tangent of the wing P2 at the specified region P21, so that when the measurement end 211 comes into contact with the specified region P21, the measurement surface 21 excluding the measurement end 211 does not come into contact with the wing P2, as shown in Figure 8(a). The inclination may be set so as to narrow inward from the table surface 22 toward the connection surface 23, and is preferably formed in this manner when manufacturing by stacking.

[0054] The measuring end 211 is provided as a protruding outer end of the table surface 22 or the connecting surface 23, and when the measuring tool X is used properly, the measuring end 211 comes into contact with a predetermined area P21, where measurements of the feather P2 can be performed. In this way, by configuring the measurement end 211 to be a surface parallel to the table surface 22, the user can more easily visually determine at which position in the specified area P21 a deviation in shape has occurred, compared to when the entire measurement surface 21 is directly brought into contact with the specified area P21 for measurement, making it easier to measure and correct the propeller P.

[0055] Sixth Embodiment 9 and 10, in this embodiment, a part of the shaft body 121 is configured as a core portion 128, and the periphery of the core portion 128 is surrounded by a cover portion 129. A gap S4 is provided between the core portion 128 and the cover portion 129. Here, FIG. 10(a) shows a cross-sectional view taken along the line SS', and FIG. 10(b) shows a cross-sectional view taken along the line TT'.

[0056] The shaft portion 12 of this embodiment is an approximately cylindrical member that is designed to be able to undergo slight elastic deformation, and is configured so that one end is fitted to the adjustment portion main body 11 and the other end is fitted to the propeller boss P1.It has an axial shaft main body 121 and an upper end portion 122 and a lower end portion 126 that have a larger diameter than the shaft main body 121, so that when it is pushed in and installed, a force is generated that presses from the inside to the outside.

[0057] Shaft body 121 is a substantially cylindrical member whose outer diameter is approximately 0.5 mm to 5 mm larger than the inner diameter of adjuster body 11, and its lower end is integrally connected to core portion 128. As shown in FIG. 9, the shaft body 121 has an upper end groove 123 which is a groove portion extending in the height direction from the upper end portion 122 through the shaft body 121 to the core portion 128.

[0058] Upper end portion 122 is a disk-shaped portion that protrudes from the top of the shaft body by approximately 0.1 to 5 mm, and is formed so that its radius is approximately 0.1 to 3 mm larger than that of shaft body 121. An upper end groove 123 is provided so as to continue from shaft body 121. However, this does not necessarily have to be provided in this embodiment.

[0059] The upper end groove 123 is composed of an upper center groove C1, which is a hole formed in the center, and an upper side surface groove S1, which is a groove provided from the side surface to the upper center groove C1. The radius of the upper center groove C1 is set so as to be at least larger than the difference between the radius of the shaft main body 121 and the radius of the shaft main body 121, and the total length of the widths of all the upper side surface grooves S1 is set so as to be at least larger than the difference between the circumferential length of the adjustment unit main body 11 and the circumferential length of the shaft main body 121. This allows the shaft main body 121 to contract radially and penetrate into the adjustment unit main body 11. In the embodiment, three upper side surface grooves S1 are provided at equal intervals, but the configuration is not limited to this. Also, the upper end groove 123 passes through the entire shaft body 121, so that it can easily penetrate into the adjustment part body 11.

[0060] As shown in FIG. 10(c), the lower end portion 126 in this embodiment is a cylindrical member having an outer diameter that is approximately the same as or slightly larger than the inner diameter of the propeller boss P1, and has a lower end groove 124 that is a cut portion provided at a predetermined position, and a protruding piece S21 that protrudes outward when it is assumed that a circle of the same shape as the internal cross section of the propeller boss is placed at the center of the lower end portion 126. A core portion 128 and a cover portion 129 are integrally formed on the upper portion of the lower end portion 126 .

[0061] The lower end groove 124 is provided independently of each other, and is comprised of a lower central groove C2, which is a cylindrical groove provided in the center, and a lower side surface groove S2, which is a groove provided on the side surface. The radius of the lower central groove C2 is at least the same as the radius of the cover portion 129, and it is preferable that the height thereof is slightly lower than the height of the lower end portion 126. In addition, the width of the lower side surface groove S2 is set to be at least larger than the width of the protruding piece S21. On the other hand, the height of the lower central groove C2 may extend to a position higher than the vicinity of the cover portion 129, thereby allowing the entire lower end portion 126 to contract in the radial direction.

[0062] The lower side surface groove S2 has two radial grooves S22 formed in the radial direction from the side surface of the lower end portion 126 toward the center, and further a coupling groove S23 connecting the center-side ends of the radial grooves S22 is provided in a shape that follows the protruding piece S21. The position of the radial groove S22 is preferably aligned with the upper side surface groove S1, but may be configured in any way. The width of the coupling groove S23 is set to be at least larger than the protruding width of the protruding piece S21, and preferably the shape of the coupling groove S23 in bottom view is set to be parallel to the outer periphery of the protruding piece S21. With this configuration, the protruding piece S21 can contract inward, and the lower end portion 126 can penetrate into the interior of the propeller boss P1. Furthermore, the durability of the shaft body 121 is improved by providing an area in the circumferential cross section of the shaft portion 12 where none of the upper end groove 123, the lower end groove 124, and the cover side surface groove S3 is provided.

[0063] Core portion 128 is a cylindrical member that connects shaft body 121 and lower end portion 126, and is provided so that its outer diameter is smaller than both shaft body 121 and lower end portion 126. Here, the connection to shaft body 121 is achieved by providing a taper so that the outer circumferential surfaces are connected to each other, and the connection to lower end portion 126 is achieved by core portion 128 being formed to extend from the center of the upper end of lower end portion 126. In the embodiment, it is assumed that the shaft portion 12 is integrally molded, but the shaft body 121, the core portion 128, and the lower end portion 126 may be configured to be removable.

[0064] Cover portion 129 is a substantially cylindrical member provided to surround core portion 128, with a thickness of approximately 1 to 5 mm, and an outer diameter that is slightly larger than the inner diameter of adjustment portion main body 11 and propeller boss P1, and is substantially the same as the outer diameter of shaft main body 121 and lower end portion 126. Cover portion 129 is provided with cover side grooves S3, which are grooves formed in the height direction at predetermined intervals, and further, a gap S4 is provided between cover portion 129 and core portion 128, allowing it to deform in the radial direction.

[0065] The cover side surface grooves S3 are grooves formed in the height direction and are provided at predetermined intervals on the flat surface portion. The cover side grooves S3 are formed so that the total length of the widths of all grooves is at least greater than the difference between the inner periphery length of the cover portion 129 and the outer periphery length of the core portion 128. Furthermore, the cover side groove S3 is positioned offset from both the upper end groove 123 and the lower end groove 124, thereby distributing the pressure from the inside and increasing the holding force.

[0066] The gap S4 is a gap portion having a predetermined width of approximately 1 mm to 5 mm, which is provided between the core portion 128 and the cover portion 129, and the gap is maintained by providing a notch in the cover portion 129 in the tapered portion of the core portion 128.

[0067] The method of using the invention in this embodiment will be described in detail below. The shaft portion 12 is used by a user who intends to connect the propeller boss P1 and the adjustment portion 1. However, the actual usage is not limited to this, and the order may be reversed.

[0068] First, the user connects the upper end portion 122 to the adjustment portion 1. When the user pushes upper end 122 into adjustment unit body 11, upper end groove 123 acts to cause upper end 122 and shaft body 121 to contract radially. At this time, the elastic force of shaft body 121 causes it to return to its original shape, generating a force pressing from the inside of adjustment unit body 11 toward the outside, thereby enabling the adjustment unit body to be fitted in with minimal rattling.

[0069] Next, the user pushes shaft portion 12 further into adjustment portion 1 so that the end of adjustment portion main body 11 is positioned halfway within cover portion 129. Like shaft main body 121, cover portion 129 also moves to return to its original shape due to its elastic force, which generates a force pressing from the inside of adjustment portion main body 11 toward the outside, allowing for a fit that minimizes rattling.

[0070] Finally, the user pushes the lower end portion 126 into the propeller boss 121. At this time, the lower end portion 126 contracts radially due to the action of the lower end groove 124, so that the lower end portion 126 can be attached to the propeller boss P1. Next, by further pushing in the lower end portion 126, the upper end of the propeller boss P1 is positioned halfway within the cover portion 129, and as described above, a force is generated that presses the propeller boss P1 from the inside toward the outside, allowing it to be fitted in with minimal rattling.

[0071] With this configuration, a radial pressing force is generated by elastic force in all areas of upper end portion 122, shaft main body 121, cover portion 129, and lower end portion 126. That is, in both adjustment portion main body 11 and propeller boss P1, which penetrate shaft portion 12, portions that press outward are disposed in at least two locations, so rattle during installation can be significantly reduced.

[0072] In particular, while rattles have conventionally been suppressed by increasing the pressing force, the configuration of this embodiment makes it possible to suppress rattles without increasing the pressing force, making it easier to insert and remove the shaft portion 12. Furthermore, the upper end groove 123, the lower end groove 124 and the cover side groove S3 have three or more groove portions arranged at equal intervals, which applies a uniform pressure to the adjustment unit main body 11 and the propeller boss P1, further reducing rattling and making it easier to align the axes when installing. [Explanation of symbols]

[0073] X Measuring Instrument 1 Adjustment part 11 Adjustment unit body 111 deep groove 112 Adjustment Support 12 Shaft section 121 Shaft body 122 Upper end 123 Top groove C1 Upper center groove S1 Top groove 124 Bottom groove C2 Lower center groove S2 Bottom groove 125 curved section 126 Lower end 127 Female thread 128 Core 129 Cover S3 Cover side groove S4 void 13 Internal thread 131 Head 132 Male thread 2 Measuring part 21 Measurement Surface 211 Measurement end 22 Table surface 23 Connection surface 3 Connection 40 stages 41 Raft 42 Support material P propeller P1 propeller boss P2 Feather The area defined on page 21 A horizontal plane

Claims

1. a measuring unit that measures the shape of a propeller blade; an adjusting unit that abuts against a part of the propeller to align it; a measuring unit that measures the shape of the blade; and a connecting unit that connects the adjusting unit and the measuring unit; the adjustment unit has an adjustment unit main body that connects to the connection unit, and a shaft portion that penetrates the propeller boss and the adjustment unit main body, The measuring unit has a measurement surface that contacts the wing and a flat table surface having one flat surface, A manufacturing method for a measuring instrument for a propeller, in which the adjustment unit main body, the measurement unit, and the connection unit are integrally formed by additive manufacturing, with the table surface being used as a first layer.

2. the measurement surface is provided by additive manufacturing at an incline in a direction extending outward from the table surface, 2. The method for manufacturing a measuring tool for a propeller according to claim 1, wherein a measuring tip for measuring the shape of the blade is formed at an end of the measuring surface that is farther from the table surface.

3. The method for manufacturing a measuring tool for a propeller according to claim 1 or 2, wherein the shaft portion has an end portion as a first layer and a groove portion formed in the axial direction by additive manufacturing in the axial direction.

4. 4. The method for manufacturing a measuring instrument for a propeller according to claim 3, wherein the groove portion is formed at the upper end of the shaft portion by forming an upper central groove which is a hole provided in the center, and an upper side surface groove which is a groove formed from the side surface to the upper central groove.

5. The method for manufacturing a measuring instrument for a propeller according to claim 4, wherein an upper end of the shaft portion is formed with an upper end portion having a diameter larger than that of the shaft body.

6. 5. The method for manufacturing a measuring instrument for a propeller according to claim 4, wherein a core portion extending in the axial direction and a cover portion covering the periphery of the core portion with a gap are formed on the shaft portion by additive manufacturing.

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