JP3005090U - Waterproof structure of rotating shaft - Google Patents

Abstract

(57) [Summary] [Purpose] Waterproofing the rotary shaft of variable resistors and rotary encoders. [Structure] A rotary shaft (1) and a groove (2) are provided to form a grease reservoir (3). Furthermore, by filling the grease (5) between the grease reservoir (3) and the bearing (4), invasion of water or the like is prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a waterproof structure of a rotating shaft in a variable resistor, a rotary encoder, or the like.

[0002]

[Prior art]

 In this type of conventional variable resistor, etc., as shown in FIG. 2, a small amount of grease (5) is applied to the gap between the rotary shaft (1) and the bearing (4). In the structure shown in Fig. 3, an O-ring is fitted by cutting an annular groove on the rotary shaft (1).

[0003]

[Problems to be solved by the device]

 However, in the conventional technology as described above, the one shown in FIG. 2 is difficult to withstand long-term use, and grease may flow out to the outside, so that moisture or the like may enter the inside of the case. .

Further, in the structure shown in FIG. 3, invasion of moisture or the like can be prevented by the O-ring, but since the pressure contact force with the bearing becomes large, the rotational torque increases, and a pressure means for newly rotating is required. However, the increase in cost due to an increase in the number of O-ring parts has been a major problem.

The present invention has been made for the purpose of improving such drawbacks of the conventionally known rotary shaft.

[0006]

[Means for Solving the Problems]

 Referring to FIG. 1, the structure of the present invention will be described. A groove (2) is cut in the outer peripheral portion of the rotary shaft (1) to form a large number of grease reservoirs (3). The grease reservoir (3) and the rotary shaft ( Grease (5) is filled between 1) and the bearing (4).

[0007]

[Action]

 Since there are many grease reservoirs (3) on the rotating shaft (1), the oil film of the grease (5) in the portion in contact with the bearing (4) does not run out, and the lubricating action and waterproof action continue for a long time.

[0008]

【Example】

 Next, the structure of the rotating shaft of the present invention will be described with reference to the drawings. In FIG. 1, a groove (2) is cut in a portion where the rotating shaft (1) and a bearing (4) are in contact with each other to form a grease reservoir ( 3) is configured.

If the grease reservoir (3) is filled with grease (5) in advance and then fitted into the bearing (4), an oil film is generated between the grease reservoir (3) and the rotary shaft (1). Is.

Needless to say, in order to generate the above-mentioned oil film, a certain degree of clearance is required in order to maintain an appropriate rotation torque and the degree of sealing of the grease (5) filled in the grease reservoir (3). .

[0011]

[Effect of device]

 As explained above, this invention forms a grease reservoir by cutting a large number of grooves in the outer peripheral part of the rotating shaft, and the oil film does not break even when the shaft rotates, preventing the ingress of water etc. from the outside. Not only is it possible, but it also has the extremely excellent effect of not increasing the rotational torque of the shaft.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a waterproof structure of a rotating shaft.

FIG. 2 is a vertical sectional view showing the structure of a conventional rotary shaft.

FIG. 3 is a vertical cross-sectional view showing the structure of a conventional rotary shaft.

[Explanation of symbols]

 1 rotating shaft 2 groove part 3 grease reservoir 4 bearing 5 grease

Claims (1)

[Scope of utility model registration request] 1. In a structure of a rotating shaft (1) and a bearing (4) for holding the rotating shaft (1), a grease reservoir (5) is formed by providing a groove (2) on an outer peripheral portion of the rotating shaft (1). Further, by filling the grease reservoir (3) and the fitting portion of the rotating shaft (1) and the bearing (4) with grease (5), invasion of moisture is prevented. Waterproof structure.