JPH0742741A - Lubricant diffusion preventing structure in machinery or equipment - Google Patents

Abstract

PURPOSE:To prevent any diffusion of a lubricant in an effective manner by installing more then one of grooves or steps in and around a part where this lubricant such as grease or the like is used, and lengthening a creeping distance between this part and another part. CONSTITUTION:In a lens barrel structure, each place, where a shutter blade 2 and a lens holding frame 7 are set up, is regarded as a lubricant penetration prohibiting zone and a bearing 1a of a feed screw shaft 4 as a lubrication application part, respectively. In addition, this bearing 1a is set up in a recess 1d to this lubricant penetration prohibiting zone, while at least one groove 1b or step part 1c is installed in and around the bearing 1a, and a creeping distance between the prohibition zone and the application part is taken long enough, and the bearing 1a is set up so as to be hidden to the prohibiting zone. With this constitution, grease 10 is preventable from diffusing into each movable space of the shutter blade 2 and the lens holding frame 7. Therefore an increase of cost of machinery and equipment is checked, and thereby the reliability and quality are improvable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricant diffusion preventing structure in a mechanical device or equipment.

[0002]

2. Description of the Related Art At least one sliding portion and a bearing are provided in various mechanical devices and equipment, and it is necessary to use a lubricant such as grease for the sliding portion and the bearing. Become. Where machinery or equipment that has sliding parts or bearings that require the use of such a lubricant is very small, the place where the lubricant should be prohibited and the use of the lubricant Since it is unavoidable that parts and parts are placed close to each other, appropriate measures must be taken at the design stage of the device or equipment to prevent lubricant from entering the area where lubricant is not allowed to enter. You must take measures.

Conventionally, the following measures have been taken as a lubricant diffusion prevention measure in a mechanical device or equipment having a lubricant use portion.

The bearing or the like is made a so-called oilless bearing so that there is no need to apply a lubricant.

A lubricant such as grease is made diffusible.

[0006] The place where the lubricant intrusion is prohibited is completely shielded from the part where the lubricant is used, or is located far from the part where the lubricant is used.

[0007]

The measures (1) to (3) above have the following problems. That is, in the case described above, the cost of the bearing and the like becomes significantly higher than that of a normal bearing. Further, even in the measures described above, the price of the lubricant used is considerably higher than the price of the normal lubricant, so that the price of the equipment or the like is increased. The measures described above are not applicable to any mechanical device or equipment. In many cases, it is not possible to completely block the area between the lubricant use area and the lubricant intrusion area due to structural problems of the device or equipment. Is difficult to place.

An object of the present invention is to provide a lubricant diffusion preventing structure capable of effectively preventing the diffusion of the lubricant from the portion where the lubricant is used to other portions or other areas regardless of the above-mentioned measures (1) to (3). In particular, the present invention provides a lubricant diffusion preventing structure suitable for a small-sized device in which the lubricant use portion and the lubricant intrusion prohibition area are close to each other.

[0009]

According to the trial of the present inventor, at least one groove or step is provided between the lubricant use site and the lubricant invasion prohibition zone, and the use site and the prohibition zone are provided. It was found that increasing the creepage distance between the two is effective in preventing the diffusion of the lubricant. It was also found that the effect can be obtained by arranging the use site in the recess so as to be hidden from the intrusion prohibition area.

Therefore, in the present invention, at least one groove or step is provided around the lubricant use portion to prevent the lubricant from diffusing from the lubricant use portion.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

The attached drawings are longitudinal sectional views of a lens barrel to which the present invention is applied.

In the figure, 11 is a base plate of the lens barrel,
Reference numeral 1 is a base plate of the shutter unit, 9 is a guide bar whose both ends are fixed to the base plate 11 and the base plate 1 and extends parallel to the optical axis of the lens, and 7 holds a lens 8 and is guided by the guide bar 9. A lens holding frame that can move parallel to the lens optical axis, 5 is a stepping motor held by the main plate 11, and 4 is a feed that is fixed to the axis of the motor 5 and extends parallel to the lens optical axis. A screw shaft, 6 is a fixed nut fixed to the lens holding frame 7 and screwed to the feed screw shaft 4, 2 is a shutter blade, and 3 is a blade holder. The tip of the feed screw shaft 4 is supported by a bearing 1a formed integrally with the shutter base plate 1, and grease 10 is applied to the bearing 1a. The bearing 1a is arranged in the recess 1b, and a groove 1b and a step 1c are provided around the bearing 1a. In the structure of the lens barrel of the present embodiment, the shutter blade 2 and the lens holding frame 7
The place where is located corresponds to the lubricant invasion prohibited area,
The bearing 1a of the feed screw shaft 4 corresponds to the portion where the lubricant is used.
Further, in the structure of this embodiment, the bearing 1a is arranged in the recess 1d with respect to the lubricant invasion prohibited area, and at least one groove 1b and at least one step portion 1c are provided around the bearing 1a. Is provided, the creepage distance between the prohibited area and the use part is long, and the bearing 1a is arranged so as to be hidden from the prohibited area. It is possible to effectively prevent 10 from diffusing into the movable space of the shutter blade 2 and the lens holding frame 7.

[0014]

As described above, according to the structure of the present invention, it is possible to effectively prevent the diffusion of the lubricant from the portion where the lubricant is used without using the oilless bearing or the grease having low diffusivity. Therefore, according to the structure of the present invention, it is possible to improve the reliability and quality of the machine or device while suppressing the cost increase of the machine or device.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a lens barrel to which the present invention has been applied.

[Explanation of Codes] 1 ... Shutter base plate 2 ... Shutter blade 3 ... Blade presser 4 ... Feed screw 5 ... Stepping motor 6 ... Fixing nut 7 ... Lens holding frame 8 ... Lens 9 ... Guide bar 10 ... Grease 11 ... Lens barrel base plate 1a ... Bearing 1b ... Groove 1c ... Step 1d ... Recess

Claims (2)

[Claims] 1. A creepage distance between a portion where the lubricant is used and another portion is increased by providing at least one groove or step around the portion where the lubricant is used such as grease. A structure for preventing lubricant from diffusing in a mechanical device or equipment, which is characterized by the above. 2. The lubricant diffusion preventing structure according to claim 1, wherein the lubricant use portion is arranged so as to be a recess with respect to other portions and the adjacent area.