JPH0592401U - Assembly camshaft - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide an assembling camshaft at a low cost, which requires a very small number of parts for assembling and is easy to construct, process, and assemble. [Structure] A cam lobe 2 having an inner diameter hole 3 having a diameter larger than that of the cam shaft 1 is fitted into the cam shaft 1, and a wedge ring 4 is press-fitted into a gap between the inner diameter hole 3 of the cam lobe 2 and the cam shaft 1. It is characterized in that the cam lobe 2 is wedge-fixed to the cam shaft 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an assembled camshaft which opens and closes an intake / exhaust valve of an engine.

[0002]

[Prior Art]

 The camshaft of the valve operating system that opens and closes the intake and exhaust valves of the engine increases the contact surface pressure of the cam due to the need for exhaust gas countermeasures in addition to high speed and high load, and it is exposed to severe conditions due to friction and wear. Has been done. Against this background, there is provided an assembled camshaft in which the camshaft and the cam lobe are manufactured separately, and the cam lobe is made of a material that is extremely wear resistant, and the cam lobe is fitted and fixed to the cam shaft.

By the way, the method of metallurgically connecting and brazing the cam lobe to the camshaft is the actual opening Sho 58-134610 and the opening 62-10207, and the actual opening as the one using a pin. Japanese Utility Model Laid-Open No. 57-75106 is a model in which a cam lobe is provided with a protrusion and is fitted into a groove of a cam shaft in Japanese Utility Model Laid-Open No. 57-75106. In the Japanese Utility Model Application Laid-Open No. 56-124205, there is a cam lobe fitted in the cam shaft with a gap and a hollow shaft joined to the hollow shaft so as to fill the gap. A pedestal having a flat surface that is inclined with respect to the axial direction and a peripheral surface that can be wedged with the flat surface, and in which a block is press-fitted so as to fill the remaining portion of the gap are actually opened. -95106 It is disclosed in.

[0004]

[Problems to be solved by the device]

 Any of the above-described conventional assembly camshafts requires time and labor for processing and assembling, has a high manufacturing cost, and has a problem that it is deteriorated by heat when it is fixed by melting, bonding or the like.

An object of the present invention is to provide an assembled camshaft that solves the above-mentioned conventional problems.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is characterized in that a cam lobe having an inner diameter hole having a diameter larger than that of the cam shaft, an inner diameter hole of the cam lobe fitted in the cam shaft, and the cam shaft. The wedge ring is press-fitted into the gap to wedge-lock the cam lobe to the cam shaft.

[0007]

[Action]

 With the above configuration, the cam lobe can be fixed to the cam shaft by press fitting the wedge ring into the gap between the inner diameter hole of the cam lobe inserted in the cam shaft and the cam shaft, which simplifies the structure, processing and assembly. Yes, it can be provided at low cost.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a camshaft, which is a solid shaft or a hollow shaft. 2 is a cam lobe. As shown in FIG. 2, the cam lobe 2 is provided with a taper hole 3 having an inner diameter larger than that of the cam shaft 1.

Reference numeral 4 is a wedge ring. As shown in FIG. 3, the wedge ring 4 has a hole 5 having an inner diameter equal to the outer diameter of the cam shaft 1 and parallel to the axis of the cam shaft 1, and an outer periphery having an inclination angle with respect to the axis of the hole 5. And the surface 6.

In this device, the wedge ring 4 is press-fitted into the gap between the taper hole 3 of the cam lobe 2 inserted in the cam shaft 1 and the outer peripheral surface of the cam shaft 1, so that the cam lobe 2 is fitted to the cam shaft 1. Secure the wedge.

In the case of FIG. 1 described above, the cam lobe 2 is wedge-fixed to the cam shaft 1 using a single wedge ring 4, but as shown in FIG. 4, two wedge rings 4a and 4b are provided. It can also be used for wedge fixing.

In this case, the cam lobe 2 is provided with a hole 3a parallel to the axis of the camshaft 1, and one wedge ring 4a has an inner diameter equal to the outer diameter of the camshaft 1 as shown in FIG. The wedge ring 4b is composed of a hole 5 parallel to the axis of the camshaft 1 and a tapered outer peripheral surface 6 having an inclination angle with respect to the axis of the hole 5, and the other wedge ring 4b has an outer circumference parallel to the axis of the camshaft 1. The surface 7 and the tapered outer peripheral surface 6 having the inclination angle of the wedge ring 4a on one side and the tapered hole 8 for taper fitting are formed.

This is a cam lobe 2 which is cam-fitted by relatively press-fitting the wedge rings 4 a, 4 b in a gap between a hole 3 a of the cam lobe 2 fitted in the cam shaft 1 and an outer peripheral surface of the cam shaft 1. The wedge is fixed to the shaft 1.

FIG. 5 shows an example of design change of FIG. The wedge-locking of the cam lobe 2 by the wedge rings 4a and 4b shown in FIG. 4 uses the entire surface of the hole 3a penetrating the entire length of the cam lobe 2 in the axial direction as a wedge-fitting surface, but as shown in FIG. In addition, the cam lobe 2 is provided with a hole 3c having the same diameter as the diameter of the cam shaft 1 and notched holes 3b having a diameter larger than that of the cam shaft 1 on both sides of the cam lobe 2, and the notched hole 3b and the cam shaft 1 are connected to each other. It is composed of two wedge rings 4d and 4c having a width that fit into the gap.

The wedge rings 4c and 4d are such that one of the wedge rings 4c has an inner diameter that is the same as the outer diameter of the camshaft 1 and that is parallel to the axis of the camshaft 1, and is inclined with respect to the axis of the hole 5. The wedge ring 4d on the other side is tapered with the outer peripheral surface 7 parallel to the axis of the camshaft 1 and the taper outer peripheral surface 6 having the inclination angle of the one wedge ring 4c. It is constituted by a taper hole 8 to be fitted.

This is one in which the wedge rings 4c and 4d are relatively press-fitted into the gaps between the cutout holes 3b on both sides of the cam lobe 2 inserted into the camshaft 1 by the holes 3c and the outer peripheral surface of the camshaft 1. By doing so, the cam lobe 2 is wedge-fixed to the cam shaft 1.

[0017]

[Effect of the device]

 As described above, according to the present invention, a cam lobe having an inner diameter larger than that of the cam shaft is fitted into the cam shaft, and a wedge ring is press-fitted into the gap between the inner diameter of the cam lobe and the cam shaft. Since it is fixed to the camshaft by wedge-locking, the number of parts required for assembly is extremely small, and the structure, processing and assembly are simple, and it is possible to provide at low cost.

[Brief description of drawings]

FIG. 1 is a sectional view of the main part of the present invention.

FIG. 2 is a partial sectional side view of the cam lobe in FIG.

3 is a partial cross-sectional side view of the edge ring in FIG.

FIG. 4 is a cross-sectional view of a main part showing another embodiment of the present invention.

5 is a cross-sectional view of main parts showing an example of design change of FIG.

[Explanation of symbols]

 1 camshaft 2 cam lobe 3 taper hole 3a hole 3b notch hole 3c hole 4 wedge ring 4a wedge ring 4b wedge ring 4c wedge ring 4d wedge ring 5 hole 6 taper outer peripheral surface 7 outer peripheral surface 8 taper hole

Claims (1)

[Scope of utility model registration request] 1. A cam lobe having an inner diameter hole larger than the diameter of the cam shaft, and a cam lobe wedge-fitted to the cam shaft by press-fitting into a gap between the inner diameter hole of the cam lobe fitted in the cam shaft and the cam shaft. Assembly camshaft consisting of a wedge ring to be fixed.