JPS6110037Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a cam mounting structure, and is a simple cam that is used in combination with a non-contact type detection switch (e.g. photoelectric type, magnetic type, etc.) to detect the position of a device or to control the timing of related operations. In terms of structure, even if there are other parts on both sides of the cam plate mounting position, the cam plate can be easily attached and detached from the camshaft without the need to remove those parts, and the structure has been simplified. The purpose is to

As shown in Fig. 1, a camshaft 3 is rotatably supported by bearings 1 and 2, and a plurality of cam plates 4 are fixedly installed on this camshaft 3 between the bearings 1 and 2, and each cam on the fixed side. A non-contact type detection switch 5 corresponding to the plate 4
is provided, and the camshaft 3 is driven by the motor 7 via the winding transmission mechanism 6, and each cam plate 4 at that time is
When detected by each detection switch 5 and used as a control signal, a simple cam structure is used as each cam plate 4.

In this type of cam structure, when the cam plate 4 is attached to the camshaft 3, the cam plate 4 is attached as shown in FIG.
The boss part 8 is fitted onto the camshaft 3 from the axial direction and fixed with a fixing screw 9, and the cam plate 4 is divided into two as shown in FIG. 3, and each divided body 10,
11 are connected to each other by two bolts 12 so as to sandwich the camshaft 3 from both sides in the right angle direction. However, in the former case, each time the cam plate 4 is attached or detached,
The camshaft 3 must be removed from the bearings 1 and 2, and although the camshaft 3 itself does not need to be removed in the latter case, two bolts 12 must be tightened. The bolt 12
It has the drawback that it takes time to rotate the device, and it also takes time to manufacture. Furthermore, when the opening angle can be set by combining two cam plates 4 as shown in Fig. 4, each cam plate 4 is attached to the cam shaft 3 so as to face each other in the axial direction as shown in Fig. 5. Therefore, the dimension L of the boss portion 8 of both cam plates 4
The disadvantage is that it is very long.

The present invention was provided for the purpose of solving such conventional problems.

An embodiment of the present invention will be described below with reference to FIGS. 6 and 7. In the figure, A and B are a pair of semicircular cam plates, and both cam plates A and B have the same outer diameter of the cam part, and each of the cam plates A and B has the same outer diameter. A fan-shaped opening 14 that opens outward from the center side of the boss portions 13a and 13b
a and 14b are formed over the entire length in the axial direction. The openings 14a and 14b have narrowed portions 15a and 15b at their respective inner ends.

The boss portion 13a on one cam plate A has a hole diameter smaller than the shaft diameter of the camshaft 3, and the narrowed portion 15
This narrowed portion 15a is set to be slightly narrower than the shaft diameter of the camshaft 3.

The boss portion 13b on the other cam plate B has a hole diameter smaller than the outer diameter of the boss portion 13a and larger than the narrowed portion 15b.
5b is set to be slightly narrower than the outer diameter of the boss portion 13a. Further, the opening 14b of the cam plate B
A through hole 18 is provided in the opposing free ends 16 and 17 forming the
A screw hole 19 is formed, into which a bolt 20 is inserted and tightened.

Therefore, when the cam plate A is pushed in the direction of the arrow a with the opening 14a side in contact with the camshaft 3,
The boss portion 14a is elastically deformed and fitted onto the camshaft 3,
The changed stress causes the cam plate B to be elastically fitted onto the camshaft 3, and when the cam plate B is pushed in the direction indicated by the arrow b with the opening 14b side in contact with the boss portion 13a, the boss portion 13b is elastically deformed and the boss portion 13
It is elastically fitted onto a.

In this state, the cam plates A and B are rotated concentrically inside and outside with the cam shaft 13 as the center.
After this, a bolt 20 is screwed into the screw hole 19 of the free end 17 from the through hole 18 of the free end 16 of the cam plate B, and by tightening the bolt 20, the opening angle of the cam plate B is adjusted. By narrowing the gap between the two free ends 16 and 17, that is, the opening of the opening 14b, the boss portion 13b on the cam plate B is tightened and fixed onto the boss portion 13a on the cam plate A. By tightening, the opening 14a of the cam plate A is narrowed, and the boss portion 13a of the cam plate A is tightened and fixed onto the camshaft 3.

As a result, both cam plates A and B are securely attached to the camshaft 3 as a whole.

As explained above, the cam mounting structure according to the present invention consists of a pair of cam plates A and B, in which one cam plate A is directly elastically fitted to the cam shaft from the perpendicular direction, and the other cam plate Plate B is directly elastically fitted to the boss portion of cam plate A from the right angle direction, so that both cam plates A and B are mounted on the cam shaft, so the opening angle of these cam plates A and B is It can be set freely and extremely easily, and to attach both cam plates A and B to the camshaft, simply tighten the opening on the cam plate B side by tightening one bolt. can be performed at the same time,
This has made it possible to simplify the work of attaching both cam plates A and B to the camshaft.

In addition, as mentioned above, the attachment of the cam plate A to the cam shaft,
By directly attaching cam plate B to the boss portion of cam plate A from the right angle direction, adjustment of the opening angle and attachment position of cam plates A and B is extremely simple and easy. There is no damage to the shaft, and even if there are other parts on both sides of the mounting position, it can be done without removing those parts. Moreover, since it has a structure that is elastically fitted in the direction orthogonal to the axis, the opening angle can be adjusted by elastically fitting the boss of another cam plate concentrically on the boss of the cam plate. The axial dimension of the boss portion can be reduced. In addition, since the free end of the boss part is fixed to the camshaft by tightening the bolt, it can be securely fixed without damaging the camshaft. Nothing. Furthermore, since the structure is simple, it can be easily manufactured by resin molding or other methods, and the manufacturing cost is extremely low.

[Brief explanation of the drawing]

Fig. 1 is a front view showing how the cam is used, Fig. 2 is a sectional view showing a conventional cam mounting structure, Fig. 3 is a side view of the same, Fig. 4 is a front view showing the conventional cam structure, Fig. 5 A is a front view showing a conventional opening angle adjustable cam mounting structure, FIG. 5B is a side view thereof, FIG. 6 is a front view showing an embodiment of the present invention, and FIG. 7 is a side view thereof. A, B...Cam plate, 13a, 13b...Boss part, 1
4a, 14b... opening, 15a, 15b... narrowed part, 16, 17... free end, 18... through hole, 19... screw hole, 20... bolt.

Claims (1)

[Scope of utility model registration request] A fan-shaped opening that opens outward from the center is provided in the boss portion of cam plate A, and the narrowed portion of this opening is made narrower than the shaft diameter of the camshaft, and the hole diameter of the boss portion is made equal to the shaft diameter of the camshaft. The boss part is elastically fitted from the opening in a direction perpendicular to the camshaft, and the outer diameter of the cam part is the same as that of cam plate A. Similar to the cam plate A, a fan-shaped opening opening outward from the center is provided,
The narrowed part of this opening is made narrower than the outer shape of the boss part of cam plate A, and the hole diameter of the boss part is made smaller than the diameter of the boss part of cam plate A, but larger than the narrowed part, so that the boss part becomes the opening. A pair of cam plates A and B are fitted from a perpendicular direction to the boss portion of cam plate A, and cam plates A and B are elastically fitted to the cam shaft concentrically with each other so that relative angles can be freely adjusted, thereby forming an opening in cam plate B. A cam mounting structure characterized in that a through hole and a screw hole are formed at the free end, and a bolt is inserted through the hole and tightened and fixed.