JPH05263814A - Joining structure for parts - Google Patents

Abstract

PURPOSE:To provide a joining structure for parts, which is simple in constitution, and is excellent in assembling properties, appearance and mounting accuracy. CONSTITUTION:One part is provided with a first butting face 2d which is perpendicularly intersected with a first coupling section 2c, and with a first pin 2b and a second pin 2a provided on the first butting face or on a face close to the aforesaid butting face in parallel with the first coupling section 2c. And the other part is provided with a second coupling section 3c coupled with the first coupling section 2c, a second butting face 3e perpendicularly intersected with the aforesaid second coupling section, a first press-in hole 3d which forms press-in relation with the first pin 2b while being rattled roughly in the radial direction on the aforesaid second butting face or on a face close to the second butting face at a position corresponding to the first pin 2b, and with a second press-in hole 3a which forms press-in relation with the second pin 3a while being rattled roughly in the radial direction at a position parted from the second butting face 3e by a specified distance L1 capable of absorbing the relative position errors of the first and second pins.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure of two parts, which are required to have positional accuracy and are press-fitted together.

[0002]

2. Description of the Related Art Conventionally, when fixing a component, such as a lens barrel, which requires positional accuracy and is not subjected to excessive stress, to another member, these two components may be fixed with screws. It was fixed by screwing male and female screws formed on the two parts, respectively.

Also, a method of joining two lenses, as disclosed in Japanese Patent Publication No. 63-44204, has been put into practical use.

[0004]

However, the above-mentioned conventional example has the following problems. a In the conventional example in which two parts are joined with a screw, the assembly becomes complicated, and the head of the screw is exposed to the outside, which is not aesthetically pleasing. b The conventional example in which two parts are screw-coupled cannot be applied to a part that is not rotationally symmetric because the position at the time of fixing cannot be determined, or when a problem occurs when the part is rotated during mounting. c In the joining method disclosed in Japanese Patent Publication No. 63-44204, the relative accuracy of the coaxiality of the central axes of the two parts and the relative tilt accuracy of the central axes are determined by the accuracy of the pin position at the time of coupling. , It is difficult to obtain accuracy.

It is an object of the present invention to provide a component connecting structure that solves the above problems.

[0006]

According to the present invention, one of two components to be press-fitted to each other has a first fitting portion formed in a substantially circular shape and orthogonal to the first fitting portion. Formed by the first
On the abutting surface, on the first abutting surface, or on a surface in the vicinity of the first abutting surface, in parallel with the first fitting portion,
Pin and second pin are provided, and the other part is provided with the first
And a second fitting portion which is fitted in the fitting portion and has a substantially circular shape, and a second fitting portion which is formed orthogonal to the second fitting portion and faces the first butting surface. On the abutting surface and the second abutting surface or a surface in the vicinity of the second abutting surface,
It is an elongated hole having a press-fitting relationship with the first pin in a substantially circumferential direction with respect to the central axis of the first fitting portion at a position corresponding to the first pin and having a play in a substantially radial direction. The first press-fitting hole and the second butting surface are separated from each other by a predetermined distance L1 at a position corresponding to the second pin with respect to the central axis of the first fitting portion. A second press-fitting hole having a long hole having a press-fitting relationship with the second pin in the circumferential direction and having a play in the substantially radial direction is provided, and the first and second pins are respectively provided with the first and second pins. The two parts are configured to be coupled by being press-fitted into the second press-fitting hole, and the relative position error of the two pins is absorbed by the elastic fall displacement of the second pin or the elastic displacement of the second press-fitting hole position. By setting the predetermined distance L1 to a possible amount, the first fitting can be achieved when the two parts are joined. The second fitting portion and the second fitting portion are in a mating relationship to ensure the coaxiality of the central axes of the two parts, and the first butting surface and the second butting surface contact each other to ensure that the two parts The relative tilt accuracy of the central axis is guaranteed, and the second pin is press-fitted into the second press-fitting hole provided at a position separated from the second abutting surface by a predetermined distance, and the second pin is elastically tilted and displaced. Alternatively, the elastic displacement of the second press-fitting hole position absorbs an error in relative positional accuracy of the two pins.

[0007]

The following is a description of the case where the embodiment of the present invention is applied to the fixing of the lens barrel. FIG. 1 is a cross-sectional view of a lens barrel, which best shows the features of the present invention, cut in parallel with the optical axis, FIG. 2 is a side view of the fixing portion of FIG. 1 seen from the right side of the drawing, and FIG. 1 is an exploded perspective view of the lens barrel of FIG. 1, and FIGS. 4 and 5 are enlarged cross-sectional views of a main part.

1 to 5, 1 is a lens, 2 is a lens barrel holding the lens 1, and 3 is a fixing portion to which the lens barrel 2 is attached.

A fitting portion 2c is provided on the lens barrel 2 coaxially with the optical axis of the lens 1, and an abutting surface 2d formed orthogonal to the fitting portion 2c or a surface near the abutting surface. A pin 2 made of an elastic material in parallel with the fitting portion
A and 2e and a pin 2b are integrally erected substantially parallel to the pins 2a and 2e.

Further, the fixing portion 3 is fitted with the fitting portion 2c of the lens barrel 2 to ensure the coaxiality of the lens 1 with respect to the fixing portion, and the fitting portion 3c. An abutting surface 3e which is orthogonal to the abutting surface 2d and faces the abutting surface 2d.
Is provided. Further, as shown in FIG. 4, a first press-fitting hole 3d into which the pin 2b is press-fitted and a second press-fitting hole 3a into which the tips of the pins 2a and 2e are press-fitted are inserted into the fixing portion 3.
3f are provided.

The first press-fitting hole 3d is provided on the abutting surface 3e or on the surface in the vicinity of the abutting surface, as shown in FIG.
As shown in FIG. 5, the pin 2b is press-fitted in a substantially circumferential direction with respect to the central axis of the fitting portion 3c, and is formed of an elongated hole having a play in a substantially radial direction. Further, the second press-fitting holes 3a and 3f are provided at a predetermined distance K1 from the abutting surface 3e, and the section of this distance L1 is the backlash portions 3b and 3f.
g is formed. Then, as shown in FIG. 2, the pin 2 is formed substantially in the circumferential direction with respect to the central axis of the fitting portion 3c.
It is composed of an elongated hole which has a press-fitting relationship with a and 2e and has a play in a substantially radial direction.

Next, a description will be given of the holding by the above-mentioned structure at the time of press fitting. By fitting the fitting portion 2c of the lens barrel 2 into the fitting portion 3c of the fixed portion 3, the central axes of the lens barrel 2 and the fixed portion 3 are aligned.

Further, when the pin 2b enters the first press-fitting hole 3d, which is an elongated hole, since the part press-fitted is the root portion of the pin 2b, it does not matter whether the pin 2b is made of an elastic body. Therefore, the pin 2b does not bend. Therefore, the position in the rotational direction of the lens barrel 2 with respect to the fixed portion 3 is uniquely determined by the positional relationship between the pin 2b and the second press-fitting hole 3d.

At this time, since the first press-fitting hole 3d is an elongated hole in the radial direction orthogonal to the central axis of the fixing portion 3, the relative position between the first press-fitting hole 3d and the pin 2b is manufactured. Due to an error, even if there is a slight deviation, there is no possibility of assembly failure due to competition with the fitting relationship between the fitting portion 2c and the fitting portion 3c.

At the time of press-fitting, the pins 2a and 2e are similarly press-fitted into the second press-fitting holes 3a and 3f.
The second press-fitting holes 3a and 3f are provided at a predetermined distance L1 from the abutting surface 3e, and as shown in FIG. 5, the fitting part 2c, the fitting part 3c, and the second press-fitting hole 3f. With respect to the relative positional relationship between the fixed portion 3 and the lens barrel 2 determined by the two sets of 3d and the pin 2b, the second press-fitting hole 3
Even if the relative positional relationship between a and the pins 2a and 3f and the pin 2e causes a positional deviation Δ due to a manufacturing error, the pin 2
The displacement can be absorbed by the elastic fall displacement of a and 2e or the elastic displacement of the press-fitting holes 3a and 3f.

As described above, the fitting portion 2c and the fitting portion 3c related to the fixing of the fixing portion 3 and the lens barrel 2, the first press-fitting hole 3d, the second press-fitting holes 3a and 3f, and the pin 2b. , 2
Since a and 2e are prevented from competing with each other to cause mounting failure, press-fit connection of the two components can be performed stably and reliably.

At the time of removal, the press-fitting holes 3a, 3
By pressing the tips of the pins 2a, 2b, 2e protruding through d and 3f, the lens barrel 2 and the fixed portion 3 can be easily separated.

[0018]

As described above, according to the present invention,
When the two parts are press-fitted together, by fitting the fitting part of one part to the fitting part of the other part, the coaxiality of the central axes of the two parts is guaranteed, and the abutting surfaces of both parts are By abutting, the relative tilt accuracy of the central axes of the two parts is guaranteed, and the pin provided on the other part is press-fitted into the press-fitting hole provided at a position separated from the abutting surface of the one part by a predetermined distance. Depending on the elastic fall displacement of the pin or the elastic displacement of the press-fitting hole position,
Since it is configured to absorb the error in the relative position accuracy of the two pins, the following effects can be obtained. 1. The structure is simple and good assemblability can be obtained. 2. Since the screws etc. are not exposed, it can also be used for the external joint. 3. The phase relationship at the time of connection can be uniquely determined. 4. It has a fitting part and an abutting part separately from the press-fitting hole, so the mounting accuracy is good.

[Brief description of drawings]

FIG. 1 is a sectional view in which a lens barrel is longitudinally cut parallel to an optical axis.

FIG. 2 is a view of the fixing portion of FIG. 1 viewed from the right side of the drawing.

FIG. 3 is an exploded perspective view of the lens barrel of FIG.

FIG. 4 is a detailed view of essential parts showing the relationship between press-fitting holes and pins.

FIG. 5 is a detail view of a main portion showing the relationship between the press-fitting holes and the pins.

[Explanation of symbols]

 2 lens barrel (one part) 2a pin 2b pin 2c fitting part 2d abutting surface 2e pin 3 fixing part (other part) 3a press fitting hole 3c fitting part 3d press fitting hole 3e abutting surface 3f press fitting hole

Claims (1)

[Claims] 1. A first fitting portion, which is formed into a substantially circular shape, is formed on one of the two parts to be press-fitted and joined together.
A first butting surface formed orthogonal to the fitting portion of
The first pin and the second pin are provided in parallel with the first fitting portion on the abutting surface of or in the vicinity of the first abutting surface, and the other part is provided with the first pin and the second pin. A second fitting portion that fits in the fitting portion and is configured in a substantially circular shape, and a second protrusion that is formed orthogonal to the second fitting portion and that faces the first butting surface. On the contact surface and on the second abutting surface or on the surface in the vicinity of the second abutting surface, a substantially circular shape is formed at a position corresponding to the first pin with respect to the central axis of the first fitting portion. A first press-fitting hole having a press-fitting relationship with the first pin in the circumferential direction and having a play in the substantially radial direction, and a position separated from the second abutting surface by a predetermined distance L1.
It is composed of an elongated hole at a position corresponding to the second pin with respect to the central axis of the first fitting portion in a press-fitting relationship with the second pin in a substantially circumferential direction and with a play in a substantially radial direction. The second
The first and second pins are press-fitted into the first and second press-fitting holes, respectively, so that two parts are coupled to each other, and a relative position error between the two pins is provided. The predetermined distance L1 is set to an amount that can be absorbed by the elastic tilt displacement of the second pin or the elastic displacement of the second press-fitting hole position.