JPH04289029A - Working method for shaft provided with oil passage - Google Patents

Abstract

PURPOSE:To improve productivity of a shaft provided with an oil passage having a plurality of oil holes spaced in the axial direction on the outer circumferential part and a communicating passage to communicate the respective oil holes, and to easily obtain a shaft having many kinds of oil passages. CONSTITUTION:A first shaft element having bottomed cylindrical main bodies 11, 12 and an oil groove extended in the radial direction on the opening edge part, and a second shaft element having bottomed cylindrical main bodies 15, 16, 17, are respectively formed by forging. The first shaft element and the second shaft element are coaxially welded together by friction welding at respective opening edge parts to form a hollow shaft. Hereby, the oil groove on the opening edge part of the first shaft element is blockaded to become an oil hole 18b. Next, the outer circumferential face of the hollow shaft is cuttingly machined flatly and smoothly, and further oil holes 19, 20 are drilled.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a shaft with an oil passage, which has a plurality of oil holes spaced apart in the axial direction on its outer circumference, and has a communication path in the shaft center that communicates the oil holes. In particular, it relates to its processing method.

0002

2. Description of the Related Art As a conventional technique, there are processing methods shown in FIGS. 5 to 8. First, the outer circumference of a cylindrical bar is cut using a lathe to form a stepped shaft body 1 as shown in FIG. This shaft body 1 has first and second medium diameter shafts 3 and 4 having an intermediate diameter on both sides of a large diameter shaft 2 having a maximum diameter, and has a minimum diameter on the right side of a second medium diameter shaft 4. It has a small diameter shaft 5 coaxially. Next, a hole is drilled using a drilling machine such as a drilling machine to form an axial hole 6 (oil passage) in the axial center of the shaft body 1 as shown in FIG. A discharge oil hole 7 (oil passage) and a supply oil hole 8 (oil passage) are formed in the axially intermediate portion of the large-diameter shaft 2 and the first medium-diameter shaft 3 as shown in FIG. These oil holes 7 and 8 are formed in the direction perpendicular to the large diameter shaft 2 and the first medium diameter shaft 3, and allow the shaft center hole 6 to communicate with the outside from the radial direction. Next, as shown in FIG. 8, a plug 9 is press-fitted into the left end of the shaft hole 6 to close the left end of the shaft hole 6, thereby obtaining a shaft A with an oil passage.

0003

[Problems to be Solved by the Invention] In the above-mentioned conventional products, the outer periphery was formed into a stepped shape by cutting, and a deep shaft center hole 6 was formed in the shaft center, so the machining process was time-consuming. However, this method has disadvantages in that productivity is poor, the amount of chips increases, and the yield of materials decreases. The object of the present invention is to provide a method for processing a shaft with an oil passage that eliminates the above-mentioned drawbacks.

0004

[Means for Solving the Problems] In order to achieve the above object, the present invention is constructed as follows. That is,
a bottomed cylindrical main body with one end closed and the other end open; a first shaft body having an oil groove extending in the radial direction at the opening edge of the main body; A second shaft element having a bottom cylindrical shape is formed by forging, and the first shaft element and the second shaft element are coaxially welded by friction welding at their respective opening edges to form a hollow shaft. The outer circumferential surface of the hollow shaft is formed to be smooth by cutting, and an oil hole communicating with the hollow portion of the hollow shaft is formed in a portion of the peripheral wall of the hollow shaft and spaced apart in the axial direction from the oil groove. It is configured to form a.

[0005]

[Operation] Since the present invention has the above structure, the first
Since the shaft body and the second shaft body are formed by forging, the processing time for these is short. Furthermore, since the first shaft element and the second shaft element are welded together by friction welding, both can be welded together in a short time. Further, when the first shaft element and the second shaft element are welded, a hollow part is formed in the first shaft element and the second shaft element, and the hollow part is inserted in the radial direction at the joint between the two. An oil hole is formed that communicates with the outside.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. In the drawings, FIGS. 1 to 4 are process diagrams showing embodiments of the present invention. First, a block-like material is forged using a forging machine to form a first shaft element 10 and a second shaft element 14 as shown in FIGS. 1 and 2. The first shaft element body 10 is formed into a bottomed cylindrical shape with the left end closed and the right end open.
A first medium diameter main body 12 having a slightly smaller diameter than the large diameter main body 11 is formed, and an oil groove 13 extending in the radial direction is further formed at the right end of the first large diameter main body 11. Further, the second shaft element body 14 is formed into a bottomed cylindrical shape with the right end closed and the left end open. A second medium diameter main body 16 having a slightly smaller diameter than the large diameter main body 15 and a small diameter main body 17 having a slightly smaller diameter than the second medium diameter main body 16 are sequentially formed. The first large diameter main body 11 and the second large diameter main body 15 are both formed to have the same diameter. Next, using a friction welding machine, the first shaft element 10 and the second shaft element 14 are coaxially friction welded (friction welded) at their open ends 10a and 14a, and the hollow shaft 18 is formed as shown in FIG. Form. This hollow shaft 18 has a hollow portion 18a (oil passage) inside and the opening end of the oil groove 13 described above is closed at the joint between the first shaft element 10 and the second shaft element 14. It has an oil hole 18b (oil passage) for oil discharge. Next, the outer periphery of the hollow shaft 18, that is, the outer peripheries of the first and second large-diameter main bodies 11, 15, first and second medium-diameter main bodies 12, 16, and small-diameter main bodies 17, are cut smooth using a lathe, and A drill is used to drill holes in the axial intermediate portions of the first and second medium-diameter main bodies 12 and 16 in the radial direction to form an oil hole 19 for oil supply and an oil hole 20 for discharge, as shown in FIG. A shaft B with an oil passage is obtained.

According to the above embodiment, the first shaft element 10 having a stepped bottomed cylindrical shape and having the oil groove 13 and the second shaft element 14 having a stepped bottomed cylindrical shape can be formed in a short time by forging. molded,
Further, the first shaft element 10 and the second shaft element 14 are joined in a short time by friction welding, and by joining these two, a hollow part 18a is formed inside, and a radial oil hole 18b is formed in the joint between them. A hollow shaft 18 is formed having a diameter of . Then, the outer peripheral part of the hollow shaft 18 is cut smoothly, and radial oil holes are formed in the first medium diameter main body 12 of the first shaft element 10 and the second medium diameter main body 16 of the second shaft element 14. 1
By drilling holes 9 and 20, a shaft B with an oil passage is formed. In this case, the amount of cutting and drilling described above is small and can be performed quickly. Further, since the first shaft element 10 and the second shaft element 14 are formed as separate parts, the first shaft element 10 and the second shaft element 14 of different types having different axial lengths may be appropriately selected. By combining them, it is possible to easily obtain many types of shafts with oil passages.

[0008]

[Effects of the Invention] As is clear from the above description, according to the present invention, the main external shape and oil passages are formed by forging and friction welding, which increases productivity and increases material yield. . Furthermore, by suitably combining different kinds of first shaft elements and second shaft elements having different shaft lengths, it is possible to easily obtain various types of shafts with oil passages.

[Brief explanation of the drawing]

FIG. 1 is a first process diagram showing an embodiment of the present invention.

FIG. 2 is a second process diagram showing an example of the present invention.

FIG. 3 is a third process diagram showing an example of the present invention.

FIG. 4 is a fourth process diagram showing an example of the present invention.

FIG. 5 is a first process diagram showing a conventional example.

FIG. 6 is a second process diagram showing a conventional example.

FIG. 7 is a third process diagram showing a conventional example.

FIG. 8 is a fourth process diagram showing a conventional example.

[Explanation of symbols]

B Shaft with oil passage 10 First axis element 10a Open end 11 First large diameter main body 12 First medium diameter main body 13 Oil groove 14 Second axis element 14a Open end 15 Second large diameter main body 16 Second medium diameter main body 17 Mainly small diameter 18 Hollow shaft 18a Hollow part (oil path) 18b Oil hole (oil path) 19 Oil hole (oil path) 20 Oil hole (oil path)

Claims (1)

[Claims] Claim 1: A first shaft body having a bottomed cylindrical main body with one end closed and the other end open, and an oil groove extending in the radial direction at the opening edge of the main body; A second shaft element having a bottomed cylindrical shape with an open end is formed by forging, and the first shaft element and the second shaft element are coaxially welded by friction welding at the edges of each opening. Next, the outer peripheral surface of the hollow shaft is formed to be smooth by cutting, and a hollow portion of the hollow shaft is formed in a portion of the peripheral wall of the hollow shaft that is spaced apart in the axial direction from the oil groove. A method for processing a shaft with an oil passage, characterized in that an oil hole communicating with the shaft is formed.