JPH0540488Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is based on an inner cylinder, such as a fixed lens barrel in a lens, and an inner cylinder, such as a fixed lens barrel, and This invention relates to a friction generating device consisting of an outer cylindrical body that is slidable in the direction of rotation around , or in both directions, and a leaf spring disposed in a space between the inner cylindrical body and the outer cylindrical body. .

[Background of the invention] Conventionally, in this type of friction generating device, as shown in FIG. 5 and FIG. A groove for holding the leaf spring is provided, and as shown in FIG. 7, a leaf spring 3 is assembled on the outer periphery of the inner cylinder 1, and an outer cylinder 2 that can slide on the outer periphery of the inner cylinder 1 is further installed. Therefore, in order to provide the groove for holding the leaf spring 3 described above, it was necessary to perform expensive machining using a milling machine or the like. Also,
In order to incorporate the leaf spring into the inner cylindrical body 1 side, as shown in FIG.
3b comes into contact with the inner surface 2i of the outer cylinder 2 and there is a risk that the sliding durability will deteriorate. As shown in FIG. 9, which is a cross-sectional view taken along arrow C, it is necessary to draw the leaf spring 3 to remove the side edges 3a and 3b from the inner surface 2i, which also increases the processing cost. It was becoming the cause of

[Purpose of the invention] The present invention solves the disadvantage of high processing cost, and at the same time improves the reliability of holding the leaf spring 3 and the durability regarding sliding between the inner cylinder 1 and the outer cylinder 2. The object of the present invention is to obtain a friction generating device using a leaf spring, which can improve performance.

[Example] An example of the present invention will be described below with reference to the drawings.

In FIG. 1, an outer cylinder 2 is provided on an inner cylinder 1 so as to be slidable in the direction of the central axis of the inner cylinder 1, in the direction of rotation about the same axis, or in both directions, A leaf spring 3 is arranged between the inner cylinder 1 and the outer cylinder 2 to generate frictional force.

As shown in the figure, the outer cylindrical body 2 has two sliding contact parts 2c and 2d on its inner surface, and a leaf spring 3 is arranged in the area sandwiched between these sliding contact parts. A cavity 2e is formed for this purpose. The inner surface 2f of the outer cylinder and the sliding contact portion 2 with respect to the cavity 2e
Round holes 2a, 2b on the boundaries 2g, 2h with c, 2d
is provided. In this way, the round holes 2a, 2b
The reason why is provided on the boundaries 2g and 2h is as follows. If the round holes 2a, 2b are provided outside the boundaries 2g, 2h, that is, on the sliding contact portions 2c, 2d, it will obviously be difficult to mount the leaf spring 3. Also, if the round holes 2a and 2b are the boundary 2g,
2h, that is, on the inner surface 2f of the outer cylindrical body 2 relative to the cavity 2e, the engagement between the ends 3c, 3d of the leaf spring 3 and the round holes 2a, 2b becomes weaker, and the outer cylindrical body 2 During sliding, there is a risk that the leaf spring 3 may fall off from a predetermined position.

Figure 2 shows the outer cylindrical body 2 incorporating the leaf spring 3.
FIG. 3 is a perspective enlarged view of the outer cylindrical body 2 incorporating the leaf spring 3 as seen from its inner surface. As described above, the round holes 2a and 2b are provided on the boundaries 2g and 2h, so that the cylindrical walls 2a' and 2b' are formed as shown in FIGS. 2 and 3. It is formed. Next, round hole 2
If the dimensions of a and 2b and the spacing between them are appropriately determined for the leaf spring 3 to be installed, the leaf spring 3 can be secured at both longitudinal ends by the round holes 2a and 2b and the cylindrical walls 2a' and 2b'. Even if the outer cylinder 2 slides in any direction on the outer peripheral surface of the inner cylinder 1, the leaf spring 3 will not fall off from the predetermined installed position.

FIG. 4 is a cross-sectional view taken along the line A-A in FIG. There is no fear of deterioration of sliding durability as described above with reference to FIG. 8.

Furthermore, since the structure is as described above, the components 2a, 2 for incorporating and holding the leaf spring 3 are
b, 2c, 2d, 2e, and 2f can be formed only by drilling and turning, and there is also the advantage that the processing cost is lower than in the conventional example.

The elements corresponding to the round holes 2a and 2b are not limited to round holes, and may be square holes, for example. Moreover, it does not have to be a through hole, but may be a blind hole.

[Effects of the invention] As explained above, according to the invention, the cost for processing and forming the structure for incorporating and holding the leaf spring is lower than that of the conventional example, and the holding of the leaf spring to be used is improved. The effect of improving reliability and durability regarding sliding between parts via the friction generating mechanism can be expected.

[Brief explanation of the drawing]

Fig. 1 is a plan view (partially sectional view) showing an embodiment of the present invention, Fig. 2 is a view of the outer cylinder 2 incorporating the leaf spring 3 in the same embodiment, viewed from its center axis; FIG. 3 is an enlarged perspective view of the outer cylinder 2 incorporating the leaf spring 3 when viewed from the inner side, FIG. 4 is a sectional view taken along the line A-A in FIG. 1, and FIG. 5 is a conventional Inner cylindrical body 1 in a friction generating device using a leaf spring
6 is a sectional view taken along the line B-B in FIG. 5, FIG. 7 is a plan view (partial sectional view) showing a conventional friction generating device using a leaf spring, and FIG. 7 is a cross-sectional view taken along the line C--C showing that the leaf spring 3 having a changed shape is incorporated, and FIG. 9 is a cross-sectional view taken along the line C--C in FIG. 7. Explanation of the symbols of the main parts: Inner cylinder body...1, Outer cylinder body...2, Leaf spring...3, Sliding part...2c, 2
d, void...2e, recess...2a, 2b.

Claims (1)

[Claims for Utility Model Registration] An inner cylindrical body, and an outer surface that fits into the inner cylindrical body and is slidable on the outer circumferential surface of the inner cylindrical body in the axial direction of the central axis of the inner cylindrical body, or in the circumferential direction, or in both directions. In a friction generating device comprising a cylindrical body and a curved leaf spring provided between the inner cylindrical body and the outer cylindrical body and engaged with both cylindrical bodies, the inner surface of the outer cylindrical body has a plurality of sliding contact parts that are spaced apart from each other and make sliding contact with the inner cylinder, a gap sandwiched between the sliding contact parts, and arranged on the boundary between the sliding contact and the inner surface of the outer cylinder with respect to the gap. is,
and a recess for accommodating an end of the leaf spring, and the curved leaf spring has both ends disposed in the recess and a top thereof pressed against the outer circumferential surface of the inner cylindrical body. A friction generating device using a leaf spring, characterized in that the device is disposed within the gap.