JPH0596409U - Camshaft with oil supply function - Google Patents

Abstract

(57) [Summary] [Purpose] Mechanically join the assembly parts that were manufactured separately to the hollow camshaft, and assemble the oil from the inside of the camshaft through the oil holes that connect the camshaft and the assembly parts. In a camshaft of the type that supplies to the sliding surface of parts, it is possible to prevent oil from leaking out of the gap between the assembled parts and the camshaft. [Structure] Pipe 22 made of synthetic resin or soft metal that is relatively easily deformed into oil hole 11 of camshaft 10 and oil hole 21 of assembly part 20
Was pressed in.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hollow cam shaft having an oil supply passage inside and a cam shaft integrally assembled by mechanically joining a cam piece and the like to the cam shaft.

[0002]

[Prior Art]

 2. Description of the Related Art A camshaft is known in which a hollow camshaft is mechanically joined to a separately manufactured assembly part such as a cam piece to be integrally assembled. As a method of mechanically joining the assembled parts to the cam shaft to integrate them, Japanese Patent Publication No. 56-506 discloses that a hollow cam shaft is expanded by forming a recess on the inner peripheral surface of the fitting hole of the assembled parts. Japanese Unexamined Patent Publication No. 63-297707 discloses a method of forming a convex portion that fits into the concave portion and forming a protrusion on the inner peripheral surface of the fitting hole of the assembly part, and the protrusion forms a fitting region on the outer peripheral surface of the cam shaft. Disclosed is a method in which a groove is cut in a circumferentially or spirally striated bulge portion formed in the above, and the groove and the projection are integrated via a projection. Since these camshafts have protrusions or recesses in the fitting holes of the assembly parts, the fitting area between the inner surface of the fitting hole and the outer surface of the camshaft does not completely adhere, and there is a partial gap between them. Occur.

[0003]

[Problems to be solved by the device]

 In the above camshaft, an oil hole that communicates with the assembly part and the cam shaft in the radial direction is provided, and if oil is made to flow inside the hollow camshaft to supply oil to the sliding surface of the assembly part, the oil hole If the oil passes through the gap between the inner peripheral surface of the fitting part fitting hole and the camshaft fitting area, oil will leak from the gap and lubrication on the sliding surface will be hindered. Even if the steel pipe was inserted into the oil hole of the camshaft and the assembly parts, the seal between the steel pipe and the oil hole was incomplete, and the oil flowed out through the above gap and the sliding surface of the cam piece There was a risk of insufficient lubrication.

The present invention has been made to solve these problems, and an object thereof is to provide a cam that mechanically joins a hollow shaft and an assembly component such as a cam piece manufactured separately. The purpose of this is to prevent oil from leaking midway when oil is passed through the inside of the cam shaft in the shaft and oil is supplied to the sliding surface from the oil holes provided in the cam shaft and cam piece.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the means adopted by the present invention is that the oil hole of the cam shaft and the oil hole of the assembly parts such as the cam piece are communicated with each other, and a pipe made of synthetic resin or soft metal is press-fitted therein. It is in.

[0006]

[Action]

 When a cam shaft that communicates a relatively easily deformable synthetic resin or soft metal pipe and the oil hole of the cam piece are press-fitted, the outer peripheral surface of the pipe comes into close contact with the inner peripheral surface of the oil hole to completely seal the oil. .. Compared to steel pipes, synthetic resin or soft metal pipes are more easily deformed, so press fitting is easier. If the camshaft and campiece oil holes are opened before assembling, the shaft centers of both oil holes may be misaligned, but the pipes tend to be comparatively deformed. Then, at least near the ends of the pipe, close the oil hole to seal the oil.

[0007]

【Example】

 The camshaft of the present invention will be described based on the embodiment shown in the drawings. As shown in FIG. 1, the camshaft comprises a hollow camshaft 10, and a campiece 20, a journal 30, and other assembling parts that are assembled to the camshaft. An oil hole 21 communicating with the inside of the cam shaft 10 is formed in the cam piece 20 and the journal 30, and a pipe 22 is press-fitted into the oil hole.

As shown in FIG. 2, an oil hole 11 of the same diameter that communicates with an oil hole 21 of the cam piece 20 is formed in the cam shaft 10 in the radial direction, and a pipe 22 has a cam pie oil hole 21 and a cam shaft oil hole. Fit on both sides of 11. The pipe 22 is made of a synthetic resin or a soft metal that is relatively easily deformed, and its outer peripheral surface is in close contact with the entire outer peripheral surfaces of the oil holes 11 and 21 to seal the oil. Therefore, even if the space 16 between the fitting region 15 on the outer periphery of the cam shaft and the inner peripheral surface 25 of the cam piece fitting hole is interposed between the oil holes 11 and 21, the oil that has passed through the interior 14 of the cam shaft 10 will form the space 16. There is nothing to leak from it. The oil hole 11 of the cam shaft 10 and the oil hole 21 of the cam piece 20 opened after the cam shaft is assembled are always coaxial, but the cam shaft oil hole 11 and the cam piece oil hole 21 opened before the assembly of the cam shaft are not always the same. There is a case where the axes do not match and the axis is slightly displaced as shown in FIG. However, the pipe 22 is deformed so as to absorb the displacement of both oil holes, and at least near both ends of the pipe 22, it is in close contact with the oil holes 11 and 21 over the entire circumference to seal the oil, so that the inside 14 of the camshaft 10 is sealed. All the oil that has passed through is supplied to the sliding surface of the cam piece 20, and there is no risk of leaking from the gap 16 in the middle.

[0009]

[Effect of the device]

 As described above, the camshaft of the present invention is made of a synthetic resin that is relatively easily deformed, unlike the conventional one in which a steel pipe is inserted through the oil hole that runs from the sliding surface of the campiece to the oil passage inside the camshaft. Or, since a soft metal pipe is press-fitted into the oil hole, even if the axial center of the oil hole of the cam shaft and the axial center of the oil hole of the cam piece are slightly misaligned, both oil holes are in close contact with each other to completely seal the oil .. Therefore, the camshaft of the present invention has an excellent effect that oil can be prevented from leaking out from the gap between the inner peripheral surface of the cam piece fitting hole and the outer peripheral surface fitting area of the camshaft. ..

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a camshaft according to an embodiment of the present invention,

2 is a longitudinal sectional view of a main part of the camshaft of FIG. 1,

FIG. 3 is a view corresponding to FIG. 2 of another embodiment,

[Explanation of symbols]

10: Cam shaft, 11: Oil hole, 14: Inside, 20: Cam piece (assembly part), 21: Oil hole, 22: Pipe

Claims (1)

[Scope of utility model registration request] 1. A hollow camshaft (10) is mechanically joined to an assembly part (20) manufactured as a separate body for assembly, and oil is transferred from the inside (14) of the camshaft to the camshaft. In a camshaft adapted to supply to the sliding surface of the assembly part through the oil holes (11, 12) of the assembly part, the camshaft oil hole (11) and the assembly part oil hole (21 ) A camshaft having an oil supply function, in which a pipe (22) made of a synthetic resin or a soft metal that is relatively easily deformed is press-fitted.