JPS5931956Y2 - groove cam mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grooved cam mechanism in which a pair of levers are connected by fitting a grooved cam and a roller, and particularly to an improvement of this roller member.

This kind of grooved cam mechanism is incorporated into various devices, and for example, there is one that is incorporated into a control device for a car cooler as shown in FIG.

This grooved cam mechanism 1 has a drive lever 2 and a driven lever 3 that are connected to a damper (not shown) provided in a duct of a car cooler via a wire or the like, and a knob 4 of this drive lever 2 is operated. The driven lever 3 is actuated via the grooved cam 5 and the roller member 6.

That is, the grooved cam mechanism 1 shown here has a plate-shaped drive lever 2 and a driven lever 3 pivotably supported on a base 7 by pins 8 and 9, and drives a roller member 6 implanted in the driven lever 3. It is fitted into a groove cam 5 formed on the lever 2.

However, as shown in FIG.
1, its diameter inevitably becomes large, which is disadvantageous in the design of the grooved cam mechanism and, by extension, in the design of the control device.

That is, when the roller member 6 has a large diameter (the groove width of the cam is S), in order to displace the roller member 6 by a predetermined amount, the slope of the grooved cam 5 is made steeper as shown by the broken line in FIG. In addition, when displacing the large diameter roller member 6 while keeping this gradient the same as that of the small diameter roller member, the moving distance of the roller member 6 must be increased, contrary to the above case. Without it, smooth cam action cannot be achieved.

If the slope of the grooved cam becomes steep in this way, the roller member 6 cannot move smoothly through the cam groove, and if the moving distance becomes long, the cam itself must be made larger, which is disadvantageous in terms of the design. will be born.

To be more specific, if the width S of the cam groove is zero, then it is 11
Even though a horizontal distance a is obtained from the point to the 22nd point, if the groove width S is as long as shown by the solid line, the effective length of the horizontal distance becomes b, which becomes small.

Therefore, in order to move the roller member 6 smoothly and without waste, it is desirable to make this diameter as small as possible, but on the other hand, there are limitations due to the strength and durability of this roller member. Needless to say.

The present invention has been made in view of the above-mentioned demands, and includes a first lever having a grooved cam in a plate body, a second lever having a roller member fitted into the grooved cam, and a second lever having a roller member fitted into the grooved cam. In the grooved cam mechanism, the roller member has a cylindrical outer frame in which a roller is rotatably sealed, and a window formed in the outer frame. A side wall of the grooved cam is fitted into the grooved cam so that the sidewall of the grooved cam and the outer peripheral surface of the roller can come into contact with each other, so that a small diameter roller member rolls in the grooved cam, The purpose is to provide a grooved cam mechanism that operates smoothly.

Hereinafter, one embodiment of the grooved cam mechanism according to the present invention will be described with reference to the drawings.

4 and 5 are a perspective view and a vertical sectional view taken along the line V-■ of the embodiment, and the roller member 21 of the grooved cam mechanism 20 has a grooved cam 22 on a plate. The tilting movement of the opened drive lever 23 is transmitted to a driven lever 24 made of a similar plate, and is installed at the tip of the driven lever 24.

This roller member 21 has a cylindrical outer frame 25, and this outer frame 2
A roller 26 is rotatably sealed within the roller 5.

A window 27 is formed in a part of the outer wall 25a of the outer frame 25, so that the inner roller 26 can be seen from the outside.

That is, the window portion 27 is formed by making a cut perpendicular to the axis of the outer frame 25, and the outer circumferential surface 2 of the inner roller 26 is
8 faces through this window portion 27.

Since the side wall 29 of the grooved cam 22 is fitted into this window portion 27, this side wall 29 and the outer peripheral surface 28 of the roller 26 are in contact with each other.

Therefore, when the drive lever 23 is driven, the driven lever 24
This means that the roller 26 operates smoothly while forwarding the roller 26.

Further, since the side wall 29 of the grooved cam 22 is held between the upper and lower end walls 27 a and 27 b of the window portion 27 , there is no possibility that the roller member 21 and the grooved cam 22 will come off due to the operation of the drive lever 23 .

In particular, if the window portion 27 is opened and the inner roller 26 is brought into direct contact with the side wall 29 of the cam, it will be the same as providing a roller member with a small diameter equal to the length of the wall thickness t of the outer frame 25. ,
The groove width of the grooved cam 22 can be reduced, and smooth cam action can be performed as described above.

Note that 30 in FIG. 5 is a caulking portion.

Next, the action will be explained.

For example, when the above-mentioned grooved cam mechanism 20 is installed in a cooler, when the drive lever 23 is operated to close the intake door that opens and closes the outside air intake, the cool air that has passed through the heat exchanger is transferred to the center ventilator, side ventilator, etc. Demister
, it operates by following the defroster or the floor door that is distributed to the feet while driving, but in this case, the drive lever 2
The driven lever 24 is moved by the grooved cam 22 formed at 3 through the roller member 21.

That is, the side wall 29 of the grooved cam 22 is held between the upper and lower end walls 27 a and 27 b of the window portion 27 and is in contact with the outer periphery of the roll roller 26 .
This ensures that the movement of the drive lever 23 is transmitted to the driven lever 24.

Furthermore, since the side wall 29 of the grooved cam 22 is in contact not with the outer frame 25 of the roller member 21 but with a small-diameter roller 26 rotatably sealed within this outer frame 25, a so-called cam action is smoothly performed. be able to.

As is clear from the above description, according to the present invention, the roller member is rotatably sealed within an outer frame having a window, and the side wall of the groove cam is sandwiched between the upper and lower end walls of the window. This ensures reliable drive transmission and enables smooth cam action.

In addition, because the roller member has a small diameter instead of the large diameter roller member used in the past, the overall length of the grooved cam is shortened, and when forming the cam itself, it has extremely excellent effects such as easier machining work. It turns out.

Furthermore, there is an advantage that not only the number of parts is reduced, but also the play caused by various tolerances is significantly reduced due to the reduction in the number of parts.

[Brief explanation of the drawing]

Figure 1 is a plan view showing an example of a conventional grooved cam mechanism incorporated into a car cooler control device, Figure 2 is a longitudinal sectional view taken along line II-II in Figure 1, and Figure 3 is a roller member and grooved cam. FIG. 4 is a perspective view of essential parts of the grooved cam mechanism according to the present invention, and FIG. 5 is a longitudinal cross-sectional view taken along line V-■ in FIG. 4. 20... Groove cam mechanism, 21... Roller member, 22... Groove cam, 23.24...
Lever, 25... Outer frame, 26... Roller, 27... Window, 27 a, 27 b...
... End wall, 28 ... Outer peripheral surface, 29 ...
...Side wall.

Claims (1)

[Claims for Utility Model Registration] A first lever having a grooved cam in a plate body, and a second lever having a roller member fitted into the grooved cam, and a lever that can be moved from either one of the levers to the other. In the grooved cam mechanism configured to transmit motion, the roller member has a cylindrical outer frame in which a roller is rotatably sealed, and a side wall of the grooved cam is inserted into a window formed in the outer frame. A grooved cam mechanism, characterized in that the side walls and the outer circumferential surface of the roller can be brought into contact with each other. 2. The grooved cam mechanism according to claim 1, wherein the roller member is rotatably attached to the second lever.