Axle protection cover and axle modification method

Abstract

To provide an axle protection cover that facilitates axle repair. [Solution] The axle protection cover 20 comprises a disc-shaped or polygonal disc-shaped cover body 21. The cover body 21 is attached so as to cover at least the outer circumference of the outer end face 15a of the axle 15 of the float 10. The axle modification method includes a cutting step of cutting the outer end face 15a of the axle 15 of the float 10, and a cover attachment step of attaching the disc-shaped cover body 21 after the cutting step so as to cover at least the outer circumference of the outer end face 15a of the axle 15.

Description

Technical Field

[0001] The present invention relates to a ground vehicle towed in a festival or the like.

Background Art

[0002] A ground vehicle is a type of float or mountain car used in festivals. In a ground vehicle, axles provided at the front and rear of the vehicle body project left and right from the vehicle body. Patent Document 1 describes a danjiri as this type of ground vehicle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a festival where a ground vehicle is towed, "yarimawashi" may be performed to change the direction of the ground vehicle with force. In yarimawashi, in rare cases, the ground vehicle may lose its balance and tilt greatly, and in the worst case, it may fall over. When the ground vehicle tilts greatly, since the axles project left and right from the vehicle body, the outer ends of the axles collide with the road. As a result, it may be possible to avoid the fall of the ground vehicle.

[0005] However, when the outer ends of the axles collide with the road, the plating of the axles may peel off or the axles may be damaged, so the axles need to be repaired. Conventionally, in repairing the axles, the axles are removed from the vehicle body, the plating of the axles is peeled off over a wide range, the damaged outer ends are polished, and then re-plating is performed, which requires a considerable amount of labor for repairing the axles.

[0006] The present invention has been made in view of such circumstances, and an object thereof is to provide an axle protection cover that can facilitate the repair of axles.

Means for Solving the Problems

[0007] To solve the above-mentioned problems, the first invention is an axle protection cover comprising a disc-shaped or polygonal disc-shaped cover body, the cover body having an annular outer circumference that covers at least the edge of the outer end face of the axle when attached to the axle of the float.

[0008] The second invention is the first invention, wherein the cover body includes an annular intermediate portion provided continuously inside the outer periphery in addition to the outer periphery, and the intermediate portion has a plurality of insertion holes for passing screws through.

[0009] The third invention is the same as the second invention, wherein the cover body has a central part that is continuously provided inside the intermediate part, and a grease injection part for supplying grease to the sliding part of the axle is provided on the front side of the central part.

[0010] The fourth invention is that, in the first invention, the outer periphery of the cover body has a tapered surface that narrows from the back side to the front side, with a slope ratio of 10% or less in a cross-sectional view.

[0011] The fifth invention is a method for modifying the axle of a festival float, comprising a cutting step of cutting off each outer end of the axle of the festival float, and a cover attachment step of attaching a disc-shaped or polygonal disc-shaped cover body to cover at least the edges of the outer end faces of the axle after the cutting step.

[0012] The sixth invention is that, in the fifth invention, a protrusion is formed on the back of the cover body in a region inward from the edge, and after the cutting process and before the cover mounting process, a recess forming process is performed to form a recess corresponding to the protrusion on the outer end face of the axle, and in the cover mounting process, the protrusion is inserted into the recess and the cover body is mounted such that the edge on the back of the cover body is in close contact with the edge on the outer end face of the axle. [Effects of the Invention]

[0013] In this invention, the axle protection cover comprises a disc-shaped or polygonal disc-shaped cover body. When attached to the axle of the float, the cover body has an annular outer circumference that covers at least the edge of the outer end face of the axle. When the float tilts sharply, the outer circumference of the cover body strikes the ground at one outer end of the axle, preventing the axle itself from striking the ground. As a result, axle repair involves removing the damaged cover body and attaching a new cover body. This process is easier than conventional axle repairs. There is no need to remove the axle from the float. According to this invention, it is possible to provide an axle protection cover that can simplify axle repair. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1(A) is a front view showing the schematic configuration of the lower part of the float, Figure 1(B) is a side view of the float's base, Figure 1(C) is a top view of the float's base, and Figure 1(D) is a cross-sectional view of the float's axle and wheels. [Figure 2] Figure 2(A) is a front view of the axle protection cover according to this embodiment, Figure 2(B) is a cross-sectional view of the axle protection cover, and Figure 2(C) is a perspective view of the axle protection cover. [Figure 3] Figure 3(A) is a side view of the axle before modification, viewed from a direction perpendicular to the axial direction; Figure 3(B) is a side view of the axle after the axle cutting process; Figure 3(C) is a cross-sectional view of the axle after the recess formation process; Figure 3(D) is a side view of the axle after the cover mounting process; and Figure 3(E) is an enlarged cross-sectional view of the axle protection cover and axle after the cover mounting process. [Figure 4] Figure 4(A) is a side view of the decorative cover, Figure 4(B) is a rear view of the decorative cover, and Figure 4(C) is a cross-sectional view of the axle protection cover with the decorative cover attached. [Modes for carrying out the invention]

[0015] Hereinafter, embodiments of the present invention will be described in detail while referring to the drawings. The following embodiments are examples of the present invention and are not intended to limit the scope of the present invention, its applications, or its uses.

[0016] This embodiment is an axle protection cover 20 attached to an axle 15 of a ground vehicle 10 such as a danjiri. Below, first, the ground vehicle 10 will be described, and then the axle protection cover 20 will be described. Also, a method for retrofitting the axle by attaching the axle protection cover 20 to an existing axle 15 of the ground vehicle 10 will be described.

[0017] [Regarding the ground vehicle] As shown in Fig. 1(A), the ground vehicle 10 includes a ground vehicle body 11 provided with decorations and the like, and a carriage 12 on which the ground vehicle body 11 is placed. In Fig. 1(A), the description of the upper part of the ground vehicle body 11 is omitted. Note that Figs. 1(A)-(D) show the state before the modification described later.

[0018] As shown in Figs. 1(B)-(C), the carriage 12 includes two axles 15 provided at the front and rear of the carriage 12, four wheels 16 attached to the left and right of each axle 15, and a carriage frame 17 placed on the two axles 15 from above. The axle 15 is made of metal and is sometimes called a "core bar". The wheels 16 are usually made of wood and are sometimes called "komas".

[0019] The carriage frame 17 includes two main members 18 extending in the front-rear direction and two connecting members 19 connecting the two main members 18 provided at intervals on the left and right. In the carriage 12, four wheels 16 are arranged in the space surrounded by the two main members 18 and the two connecting members 19. Each main member 18 is a member with a rectangular cross-section, and a concave portion into which the wheel 16 fits is formed on its lower surface. An axle holding member 13 called a "neko-gi" is attached to each main member 18 to hold the axle 15 fitted in the concave portion from below (see Fig. 1(B)).

[0020] Inside the axle 15, as shown in Fig. 1(D), an oil supply passage 5 is formed along the axis. The oil supply passage 5 extends from the outer end face 15a of the axle 15 to the mounting position of the wheel 16. At the mounting position of the wheel 16 on the axle 15, an oil drain hole extending from the oil supply passage 5 to the outer peripheral surface is formed. Here, a plurality of bearings are provided on the inner surface of the dobby 8 attached to the inside of the wheel 16. The lubricant (grease) is supplied to each bearing through the oil supply passage 5 and the oil drain hole. As a result, the wheel 16 rotates smoothly with respect to the axle 15.

[0021] [Regarding the axle protection cover] As shown in Figs. 2(A)-(C), the axle protection cover 20 includes a disc-shaped cover body 21 and a grease injection portion 22 provided at the center of the cover body 21. The cover body 21 is attached so as to cover at least the edge portion of the outer end face 15a of the axle 15. A grease nipple is used for the grease injection portion 22. Note that the grease injection portion 22 is shown only in Fig. 2(C) among Figs. 2(A)-(C). In this specification, in the state where the cover body 21 is attached to the axle 15, the axle 15 side is referred to as the "back side" and the opposite side is referred to as the "front side". Also, a "disc" means a circular and flat shape.

[0022] The cover body 21 is a member that呈 circular in a front view. The outer diameter of the cover body 21 is approximately equal to the diameter of the axle 15. As shown in Figs. 2(A)-(B), the cover body 21 is continuously provided with a center portion 31 where the grease injection portion 22 is provided, an intermediate portion 32 in which a plurality of insertion holes 30 are formed, and an outer peripheral portion 33 that constitutes the edge portion of the cover body 21 in this order from the center side. Metal (for example, bearing steel (high-carbon chromium bearing steel)) can be used as the material of the cover body 21. The cover body 21 is quenched.

[0023] The center portion 31 is a circular portion in a front view. The center portion 31 is constituted by a concave portion that is recessed with respect to the intermediate portion 32. An insertion hole 31a to which the grease injection portion 22 is attached is formed on the bottom surface of the center portion 31. The insertion hole 31a is a screw hole. It should be noted that there is an unclear expression "呈 circular" in the translation of item . It might be a more accurate expression in the original language that needs to be further clarified. If possible, it is recommended to check and correct it according to the source text.

[0024] The intermediate section 32 is an annular portion when viewed from the front. In the intermediate section 32, multiple (eight in this embodiment) through holes 30 are arranged at equal angular intervals in the circumferential direction. Each through hole 30 consists of a large-diameter section 30a that opens to the front and a small-diameter section 30b that has a smaller diameter than the large-diameter section 30a and opens to the back. The large-diameter section 30a is counterbore. The small-diameter section 30b is made of a drilled hole.

[0025] The outer periphery 33 is an annular portion when viewed from the front. When viewed from the side, the outer periphery 33 protrudes slightly towards the front compared to the intermediate portion 32. As a result, the cover body 21 has a front-facing recess 35 formed in the area of ​​the central portion 31 and the intermediate portion 32.

[0026] On the outer circumference of the outer periphery 33, a rounded edge (R-shaped section) is formed on the front side, and a tapered surface 33a and a cylindrical surface 33b are provided in this order, continuous with the rounded edge. The tapered surface 33a has a slope ratio of 10% or less (preferably 6% or less) in cross-sectional view and narrows from the back side towards the front side. The cylindrical surface 33b has a constant diameter. The corners 33c on the back side of the outer periphery 33 are not machined (chamfered or R-shaped, etc.), and in cross-sectional view, the back side and the cylindrical surface 33b intersect at approximately a right angle. The outer surface of the outer periphery 33 is plated.

[0027] On the back of the cover body 21, a back-side protrusion 36 is formed in the area inward from the edge 37. The back-side protrusion 36 has a low cylindrical shape. A back-side recess 38 is formed in the center of the back-side protrusion 36, which connects to the insertion hole 31a. The depth dimension of the back-side recess 38 is smaller than the height dimension of the back-side protrusion 36. When the cover body 21 is attached to the axle 15, an O-ring is placed in the back-side recess 38 (not shown).

[0028] [How to modify the axle] The modification of the axle 15 is carried out after removing the axle 15 with the wheel 16 attached from the bogie 12 of the float 10, and then removing the wheel 16 from the axle 15. The modification method for the axle 15 consists of an axle cutting step of cutting the outer end of the axle 15, a recess forming step of forming a recess 14 on the outer end face 15a of the axle 15, and a cover mounting step of attaching the cover body 21 to the outer end face 15a of the axle 15. Each step will be explained using the drawings.

[0029] In the axle cutting process, the axle 15 is cut at each outer end by a length equivalent to the thickness of the cover body 21. The thickness of the cover body 21 is, for example, 20 mm to 40 mm. The axle 15 is cut in a direction perpendicular to the axial direction. In Figure 3(A), the arrows indicate the cutting positions of the axle 15. Figure 3(B) shows a side view of the axle 15 after the axle cutting process.

[0030] In the recess formation process, recesses 14 corresponding to the rear-side protrusions 36 on the back surface of the cover body 21 are formed on each outer end face 15a of the axle 15 by machining. The recesses 14 are circular in front view. Figure 3(C) shows a cross-sectional view of the axle 15 after the recess formation process.

[0031] In the cover mounting process, screw holes corresponding to multiple through holes 30 are formed on the outer end face 15a. Then, the cover body 21 is mounted such that the rear side protrusions 36 are inserted into the recesses 14 on each outer end face 15a of the axle 15, and the rear edge 37 of the cover body 21 is in close contact with the edge of the outer end face 15a of the axle 15 (the portion outside the recess 14) in the circumferential direction. In the cover mounting process, screws 50 are screwed into the aforementioned screw holes through each through hole 30. Washers are provided at the base of the shaft portion of the screws 50.

[0032] Here, the diameter of the rear projection 36 is slightly smaller than the diameter of the recess 14. Also, the depth dimension of the recess 14 is slightly larger than the height dimension of the rear projection 36. The cover body 21 is attached so that there is almost no gap between the outer surface of the axle 15 and the outer surface of the cover body 21. A small gap is formed between the bottom surface of the recess 14 and the top surface of the rear projection 36. Figure 3(D) shows a side view of the axle 15 after the cover attachment process. Figure 3(E) is an enlarged cross-sectional view of the axle protection cover 20 and axle 15 after the cover attachment process.

[0033] The modification of the axle 15 is completed through the above steps. After the modification of the axle 15, the wheel 16 is attached to the axle 15, and then the axle 15 is attached to the bogie 12.

[0034] In this embodiment, the decorative cover (cap) 40 shown in Figures 4(A)-(B) is attached to the front recess 35 of the cover body 21. The decorative cover 40 comprises a disc-shaped main body 41 and a cylindrical projection 42 that protrudes from the back surface of the main body 41. The front surface of the main body 41 can be decorated with letters, patterns, or other designs. An insertion hole 42a extending in the axial direction is opened at the tip surface of the projection 42. The decorative cover 40 is attached to the front recess 35 by screwing a male thread formed on the outer surface of the projection 42 into a female thread formed on the inner surface of the recess in the central part 31. In this state, as shown in Figure 4(C), the grease injection part 22 is housed in the insertion hole 42a. The decorative cover 40 may be attached to the front recess 35 before the axle 15 is attached to the bogie 12.

[0035] [Effects of the embodiment, etc.] In this embodiment, for example, a disc-shaped cover body 21 with a thickness of 20 mm or more is attached so as to cover at least the edge of the outer end surface 15a of the axle 15 of the float 10. Therefore, when the float 10 tilts sharply, the cover body 21 collides with the ground at one outer end of the axle 15, preventing the axle 15 itself from colliding with the ground. As a result, repairing the axle 15 involves removing the damaged cover body 21 and attaching a new cover body 21. There is no need to remove the axle 15 from the vehicle body (bogie 12). This process is easier than conventional axle repairs.

[0036] In this embodiment, the outer circumference of the cover body 21 has a tapered surface 33a that narrows from the back side to the front side, with a cross-sectional inclination of 10% or less. Here, the diameter of the central hole into which the axle 15 is inserted in the wheel 16 is approximately equal to the diameter of the axle 15 and approximately equal to the diameter of the cover body 21. Therefore, if the outer circumference of the cover body 21 consists only of a cylindrical surface with a constant diameter, it is not easy to pass the axle 15 through the central hole of the wheel 16 after the axle 15 has been modified. In contrast, in this embodiment, since the outer circumference of the cover body 21 has a tapered surface 33a, it is possible to facilitate the process of passing the axle 15 through the central hole of the wheel 16.

[0037] In this embodiment, since the grease injection section 22 is provided in the center of the front side of the cover body 21, grease can be supplied to the bearing of the wheel 16 from the grease injection section 22 without removing the cover body 21.

[0038] In this embodiment, since the thickness of the cover body 21 is 20 mm or more, sufficient strength to withstand impacts from the ground can be ensured, and since the thickness of the cover body 21 is 40 mm or less, it is possible to avoid the cover body 21 becoming too heavy.

[0039] [Other embodiments] In the above embodiment, the cover body 21 covers the entire outer end face 15a of the axle 15. However, for example, a through hole may be provided in the center of the cover body 21 so that the cover body 21 covers only the edge of the outer end face 15a of the axle 15. In this case, a grease injection part 22 may be provided on the outer end face 15a of the axle 15.

[0040] In the above embodiment, the entire back surface of the cover body 21 may be made flat, and the recess formation step in the axle modification method may be omitted.

[0041] In the above embodiment, the cover body 21 was attached to the outer end face 15a of the axle 15 after cutting. However, the cover body 21 may also be attached to the original outer end face 15a without cutting the axle 15.

[0042] In the above-described embodiment, the cover body 21 was disc-shaped, but the cover body 21 may be formed in the shape of a polygon (for example, a regular polygon with 16 or more corners). For example, the intermediate portion 32 and the outer peripheral portion 33 are formed in the shape of a polygonal ring. In this case, when viewed in the axial direction of the axle 15, the cover body 21 may protrude slightly from the outer circumference of the axle portion 15.

[0043] In the above-described embodiment, the cover body 21 is divided into multiple sections when viewed from the front, and may take the form of a disc or a polygonal disc when attached to the axle 15. [Industrial applicability]

[0044] This invention is applicable to floats and other structures pulled during festivals. [Explanation of Symbols]

[0045] 10 Danjiri 15 axles 16 wheels 20 Axle protection cover 21 Cover body 22 Grease injection section 30 Through hole 31 Center of the cover body 32 Middle part of the car cover body 33 Outer perimeter of the cover body 33a Outer surface

Claims

1. It comprises a disc-shaped or polygonal disc-shaped cover body, The cover body is an axle protection cover having an annular outer circumference that covers at least the edge of the outer end face of the axle when attached to the axle of the float.

2. The cover body includes, in addition to the outer periphery, an annular intermediate portion provided continuously inside the outer periphery, The axle protection cover according to claim 1, wherein a plurality of insertion holes for passing screws are formed in the intermediate portion.

3. The cover body has a central part that is continuously provided inside the intermediate part, The axle protection cover according to claim 2, wherein a grease injection portion for supplying grease to the sliding portion of the axle is provided on the front side of the central part.

4. The axle protection cover according to claim 1, wherein the outer periphery of the cover body has a tapered surface that narrows from the back side to the front side, with a tilt ratio of 10% or less in cross-sectional view.

5. A method for modifying the axle of a festival float, A cutting process in which each outer end of the axle of the festival float is cut off, A method for modifying an axle, comprising the cutting step followed by a cover mounting step of attaching a disc-shaped or polygonal disc-shaped cover body so as to cover at least the edge of the outer end face of the axle.

6. On the back of the cover body, a protrusion is formed in the area inward from the edge. After the cutting step and before performing the cover mounting step, a recess forming step is performed on the outer end face of the axle to form a recess corresponding to the protrusion. The method for modifying an axle according to claim 5, wherein in the cover mounting step, the cover body is mounted such that the protrusion is inserted into the recess and the edge of the back surface of the cover body is in close contact with the edge of the outer end surface of the axle.

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