JP5754803B2 - Rotating electrical parts - Google Patents

Description

  The present invention relates to a rotary electrical component, and more particularly, to a rotary electrical component such as a waterproof encoder, variable resistor, switch, and the like.

  As a conventional rotary electrical component having waterproofness, grease is inserted between a shaft that is rotated by an operator and a bearing that rotatably holds the shaft, and a lubricating effect of the shaft and the bearing is obtained. It is known that an O-ring is inserted in two spaced locations between a shaft and a bearing, and the O-ring is deformed to adhere to the shaft and the bearing, thereby preventing water from entering the gap between the shaft and the bearing. . (For example, refer to Patent Document 1).

  By the way, recent electric parts are required to be reduced in size and price, and the waterproof structure is also required to have a more simplified structure that can be reduced in size.

  In the waterproof structure of electrical parts using O-rings as described above, an increase in the number of parts is inevitable, and the O-rings must be miniaturized as the electrical parts become smaller. Therefore, it is necessary to increase the processing accuracy of the grooving process, and this increases the cost of processing the parts. Furthermore, the downsizing of the O-ring makes it difficult to assemble the O-ring, resulting in an increase in assembly cost.

Japanese Utility Model Publication No. 7-14304

  In view of the above problems, an object of the present invention is to provide a rotating electrical component that can reduce the number of components and that can obtain waterproof characteristics required by a simplified structure.

In order to achieve the above object, in the rotating electrical component of the present invention, a bearing member having a cylindrical bearing portion, a case member disposed opposite to the bearing member , the bearing member and the case member, A shaft member that is rotatably held by the bearing portion, and a flange portion provided on one end side of the shaft portion, and the shaft portion is inserted into the bearing portion. The other end side protrudes, and the rotation is provided with a shaft member in which the flange portion is housed in a housing portion constituted by the bearing member and the case member, and detection means for detecting the rotational motion of the shaft member. In the type electric component, a plurality of recesses extending in the rotation axis direction of the shaft member are provided on the inner peripheral surface of the bearing portion with a circumferential interval, and one end of the recess is accommodated in the housing of the bearing member. Open end with open side And the other end side of the concave portion is provided continuously to the middle of the bearing portion, and the shaft portion is located at a position on the extension line of the concave portion in the flange portion facing the open end of the concave portion. An annular groove portion is provided to circulate, and the recess and the groove portion constitute a grease holding portion, and the grease holding portion holds the grease, and the bearing member has a surface facing the case member. A first outer peripheral wall that wraps around the entire circumference along the outer peripheral portion is provided, and a second outer peripheral wall that overlaps the first outer peripheral wall is entirely formed on a surface of the case member that faces the bearing member. The first outer peripheral wall end and the second outer peripheral wall end, which are provided over the circumference, are each provided with an inclined portion in which the front end side of the outer peripheral wall becomes narrow, Inclined part of front wall and front In the inclined portion of the second outer peripheral wall, providing the difference in angle of inclination, and wherein.

With this feature, in the rotating electrical component of the present invention, the grease held in the recess provided on the inner peripheral surface of the bearing portion fills the gap between the bearing portion of the bearing member and the shaft portion of the shaft member. Waterproof properties can be obtained. As a result, an O-ring or the like is not required, the number of parts can be reduced, and waterproof characteristics required with a simplified structure can be obtained. In addition, the grease fills the plurality of recesses and fills the annular groove, and since the grease filled in the recesses and the grease filled in the grooves are connected, there is a difference in the amount of grease filling between the plurality of recesses. Even if it occurs, the grease is supplied to the recesses with a small amount of grease from the recesses with a large amount of grease through the annular groove by rotating the shaft member. Can be adjusted to obtain a uniform grease filling state. Thereby, a stable waterproof characteristic can be obtained. In addition, since there is a difference in the inclination angle between the inclined portion at the end of the first outer peripheral wall and the inclined portion at the end of the second outer peripheral wall, the tip of the outer peripheral wall with the larger inclination angle is the other outer periphery. Since it always engages with the inclined part of the wall, the engaging part becomes clear and the accuracy control of the parts becomes easy, so that the sealing of the contact part can be reliably maintained, and the waterproof performance between the bearing member and the case member Can be increased.

  In the rotating electrical component of the present invention, the flange portion is formed to have a diameter larger than that of the shaft portion, and a recess portion that accommodates a part of the flange portion is provided on the surface of the bearing member on the housing portion side. The open end of the recess is exposed on the inner bottom surface of the recess, and is connected to the grease holding portion between one end surface of the flange portion located on the outer peripheral side of the groove and the inner bottom surface of the recess. A first gap is provided, and a second gap connected to the first gap is provided between the outer peripheral surface of the flange and the inner peripheral surface of the recess.

  With this feature, in the rotary electric component according to the present invention, the grease is filled in the grease holding portion including the plurality of concave portions and the annular groove portion, and the first gap portion continuing to the grease holding portion, and the first Since it becomes possible to fill the second gap portion continuous to the gap portion, the grease is held in the first gap portion and the second gap portion even when the grease filling amount is excessive, and is difficult to protrude from the second gap portion. . This facilitates the management of the grease filling amount, so that a sufficient amount of grease can be applied to fill the grease holding portion, and a stable waterproof property can be obtained.

  In the rotary electrical component of the present invention, a projecting portion or a hole having a circular cross section is provided on the bottom surface of the case member facing the flange portion of the shaft member, and the flange portion facing the bottom surface of the case member is provided. A hole or protrusion having a circular cross section is provided, and the hole or protrusion of the flange and the protrusion or hole of the case member are rotatably engaged. To do.

  Due to this feature, when the rotary electric component of the present invention is rotated, the shaft member is provided at two locations: a cylindrical bearing portion of the bearing member and a protrusion or a hole provided on the bottom surface of the case member. It rotates while being held. As a result, the deflection of the shaft member during rotation is reduced, so that the change in the gap between the bearing portion of the bearing member and the shaft portion of the shaft member during rotation of the shaft member is kept small, and the grease filled in the recess is less likely to be interrupted. Stable waterproof properties can be obtained.

  In the rotary electric component according to the present invention, the first outer peripheral wall and the second outer peripheral wall are both rectangular, and are away from the case member at a corner portion inside the first outer peripheral wall of the bearing member. A bottomed hole portion recessed in a direction is provided, and a bottomed hole portion recessed in a direction away from the bearing member is provided in a corner portion inside the second outer peripheral wall of the case member. To do.

  Due to this feature, in the rotating electrical component of the present invention, since both the first outer peripheral wall and the second outer peripheral wall are rectangular, most of unintentional flooding occurs at the corners of the rectangular outer peripheral wall. And by providing holes with bottoms at the inner corners of the first outer peripheral wall and the second outer peripheral wall, respectively, unintentional flooding can be captured in the hole, The waterproof performance between the case members can be enhanced.

In the rotating electrical component of the present invention, the grease held in the recess provided on the inner peripheral surface of the bearing portion fills the gap between the bearing portion of the bearing member and the shaft portion of the shaft member. Since the waterproof property between the members can be obtained, this eliminates the need for an O-ring and the like, thereby reducing the number of parts and obtaining the waterproof property required with a simplified structure. In addition, the grease fills the plurality of recesses and fills the annular groove, and since the grease filled in the recesses and the grease filled in the grooves are connected, there is a difference in the amount of grease filling between the plurality of recesses. Even if it occurs, the grease is supplied to the recesses with a small amount of grease from the recesses with a large amount of grease through the annular groove by rotating the shaft member. Can be adjusted to obtain a uniform grease filling state. Thereby, a stable waterproof characteristic can be obtained. In addition, since there is a difference in the inclination angle between the inclined portion at the end of the first outer peripheral wall and the inclined portion at the end of the second outer peripheral wall, the tip of the outer peripheral wall with the larger inclination angle is the other outer periphery. Since it always engages with the inclined part of the wall, the engaging part becomes clear and the accuracy control of the parts becomes easy, so that the sealing of the contact part can be reliably maintained, and the waterproof performance between the bearing member and the case member Can be increased.

1 is an external perspective view of an encoder that is a rotary electric component according to an embodiment of the present invention. The disassembled perspective view which shows the structure of the encoder in embodiment of this invention. (A) is an exploded perspective view obliquely viewed from above. (B) is an exploded perspective view obliquely viewed downward. The perspective view of the downward view which shows the attachment state of the leaf | plate spring to a bearing member. The perspective view which shows the grease application | coating state to a shaft member. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 showing the structure of the encoder according to the embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line BB in FIG. 1 showing the structure of the encoder according to the embodiment of the present invention. The center sectional view explaining the state of grease when a shaft member is inserted in a bearing member. (A) is when the insertion of a shaft member is started. (B) is when the shaft member is inserted halfway. (C) is when the shaft member is inserted to just before the final position. (D) is when the shaft member is inserted to the final position. The center sectional view which shows the inclination angle of the inclination part of the 1st outer peripheral wall of a bearing member, and the inclination angle of the 2nd inclination part of a case member. The principal part of center sectional drawing which shows the contact state of the inclination part of the 1st outer peripheral wall of a bearing member, and the 2nd inclination part of a case member.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The rotary electrical component according to the present embodiment is a rotary absolute encoder (hereinafter abbreviated as an encoder), but the application of the invention is not limited to this, and the rotary increment encoder, The present invention can be applied to various rotating electrical parts such as variable resistors and switches.

<Embodiment>
FIG. 1 is a perspective view of an encoder according to an embodiment of the present invention.
As shown in FIG. 1, the external appearance of the encoder according to the embodiment of the present invention is a substantially box-shaped bearing member 2 having a cylindrical bearing portion 21, and a substantially box-like shape arranged opposite to the bearing member 2. The case member 3, the shaft member 1 having a shaft portion 11 that protrudes from the bearing portion 21 of the bearing member 2 and is rotated, and the frame member 4 that holds the bearing member 2 and the case member 3.

Hereinafter, description of each component is described with reference to FIG. 2 (a), (b) and FIG.
FIG. 2A is an exploded perspective view of the encoder according to the embodiment of the present invention, and is an exploded perspective view obliquely upward, and FIG. 2B is an exploded perspective view obliquely viewed downward.

  The shaft member 1 is formed of a molding material or the like, and has a cylindrical shaft portion 11 and a flange portion 12 having a diameter larger than that of the shaft portion 11 at one end thereof, and a shaft portion 11 on the end surface of the flange portion 12 on the shaft portion 11 side. An annular (annular) groove portion 14 that circulates around the portion 11 is formed, and a code plate attachment portion 13 having a larger diameter is formed on the opposite side of the flange portion 12 from the shaft portion 11 side. Note that the code plate attachment portion 13 also constitutes a part of the flange portion 12.

A plurality of semi-cylindrical convex portions 15 for generating a click feeling are formed on the upper surface (surface on the shaft portion 11 side) of the code plate attachment portion 13, which is opposite to the shaft portion 11 of the code plate attachment portion 13. On the side end surface (lower surface), a code plate 16 made of a metal plate, which is a component of the detecting means for detecting the rotation operation, is embedded and attached by insert molding or the like, and a projection is provided in the center, and the center of the projection A circular hole 17 is provided in the upper part.
Further, the vicinity of the tip portion of the shaft portion 11 is formed in a D-shaped cross section, and a flat portion for mounting a part such as a knob for operating the shaft member 1 is provided.

The bearing member 2 is formed of a molding material or the like, has a substantially cylindrical bearing portion 21 on one (upper) surface of a substantially box-shaped main body portion 22, and an insertion hole 21 a provided in the bearing portion 21 has a bearing portion. 21 to the main body 22.
The hole diameter of the insertion hole 21a changes in two steps, and the hole diameter is smaller on the tip side of the bearing portion 21, and the shaft portion 11 of the shaft member 1 can be rotated with a gap as small as possible at this portion. Hold.

The center of the surface of the main body portion 22 on the side facing the case member 3 is recessed in a substantially circular shape, and serves as a housing portion 23 that houses a part of the flange portion 12 including the code plate mounting portion 13 of the shaft member 1. Yes.
The center of the inner bottom surface (the ceiling surface located on the upper side in the drawing in FIG. 2) of the housing portion 23 is further recessed in a substantially circular shape toward the upper side, and a flange housing for housing a part (upper part) of the flange portion 12 of the shaft member 1. A cylindrical projection for attaching a leaf spring 5 for generating a click feeling during a rotation operation is provided at an intermediate position of the inner bottom surface of the housing portion 23 connected to the flange housing portion 25. ing.

The diameter of the substantially circular inner peripheral surface of the flange accommodating portion 25 is set to be slightly larger than the diameter on the upper side of the flange portion 12, and the inner peripheral surface of the flange accommodating portion 25 when the upper portion of the flange portion 12 is inserted. There is a slight gap between the outer peripheral surface of the flange portion 12 and the outer peripheral surface.
In addition, one end side of an insertion hole 21 a provided in the bearing portion 21 is open at the center of the inner bottom surface (ceiling surface) of the flange housing portion 25. One end (lower end) is an open end opened to the inner bottom surface of the flange accommodating portion 25 on the inner peripheral surface of the insertion hole 21a on the flange accommodating portion 25 side, and the other end is inserted in the rotation axis direction of the shaft member 1. A plurality of recesses 24 extending to the middle of the hole 21a are provided at intervals in the circumferential direction. The annular groove portion 14 of the shaft member 1 described above is formed in the flange portion 12 at a position facing one end which is an open end of the plurality of recesses 24. That is, the annular groove portion 14 is provided on the extension line of the plurality of recesses 24 extending in the rotation axis direction of the shaft member 1.

  A first outer peripheral wall 26 whose periphery is closed is erected on the main body 22 along the outer shape of the surface facing the case member 3. An end surface (lower end portion) of the first outer peripheral wall 26 having a rectangular shape is provided with an inner surface having an inclined portion 26a with an inclination angle θ1 shown in FIG. Further, a plurality of bottomed hole portions 27 are provided in a corner portion surrounded by the first outer peripheral wall 26 and the recess of the housing portion 23 on the side facing the case member 3 of the main body portion 22. .

  The leaf spring 5 is formed in a ring shape with a metal such as phosphor bronze having good spring properties, and two substantially rectangular attachment portions 51 with attachment holes are arranged at two symmetrical positions, and the two attachment portions 51 are left and right. Two semi-arc-shaped arms are provided so as to be connected to each other. The arm part is bent at an end connected to the plane of the attachment part 51 with an inclination angle, and a hemispherical protrusion part 52 surrounded by a substantially rectangular flat part 53 is provided at an intermediate position of each arm part. It has been.

  In the leaf spring 5 according to the embodiment of the present invention, the protrusion 52 is a hemispherical protrusion and the periphery is a flat portion 53. As a result, when the leaf spring 5 is incorporated into the product and the arm portion is elastically deformed by the code plate attachment portion 13 of the shaft member 1, the flat portion 53 is not easily deformed, so that the leaf spring 5 generates a large elastic stress. Since a plurality of semi-cylindrical convex portions 15 for generating a click feeling are strongly pressed, a good click feeling can be obtained.

  The case member 3 is formed in a substantially box shape by a molding material or the like, and a substantially circular recess is provided in the center of the surface on the side facing the bearing member 2, and a part of the code plate attachment portion 13 of the shaft member 1 is accommodated. It is set as the accommodating part 31 to do. At the center of the inner bottom surface of the accommodating portion 31, a columnar protruding portion 34 that is rotatably engaged with the hole portion 17 of the flange portion 12 (code plate attachment portion 13) of the shaft member 1 is provided. A plurality of sliders 32, which are constituent elements of detection means for detecting the rotation operation of the shaft member 1, are embedded around the protruding portion 34 on the inner bottom surface of the housing portion 31. Each slider 32 extends inside the case member 3, protrudes to the outside from the side surface of the case member 3, bends the tip, and is electrically connected to a printed circuit board (not shown) or the like 36. It has become. The detecting means for detecting the rotational movement of the shaft member 1 includes a code plate 16 provided on the shaft member 1 and a plurality of sliders 32 that are in sliding contact with the code plate 16.

  The case member 3 is provided with a second outer peripheral wall 33 whose periphery is closed along a slightly inner side of the outer shape of the surface facing the bearing member 2. An end surface (upper end portion) of the rectangular second outer peripheral wall 33 is provided with an outer surface having an inclined portion 33a with an inclination angle θ2 shown in FIG. The inclined portion 26a on the inner side of the first outer peripheral wall 26 of the bearing member 2 and the inclined portion 33a on the outer side of the second outer peripheral wall 33 of the case member 3 are disposed at opposing positions. In addition, a plurality of bottomed hole portions 35 are provided in a corner portion surrounded by the second outer peripheral wall 33 and the recess of the housing portion 31 on the side facing the bearing member 2.

  The frame member 4 is formed by bending a metal material with good workability, such as a soft steel plate, into a U-shape when viewed from the side, and a hole for penetrating the bearing portion 21 is provided in a flat portion at the center of the U-shape. The two U-shaped tip portions partially extend, and two crimping claws for holding the bearing member 2 and the case member 3 in contact with each other, and a hook for attaching to a printed circuit board or the like The part is formed.

  Next, the structure of the encoder will be described with reference to FIGS. 3 to 5 according to the assembly procedure of the encoder according to the embodiment of the present invention. FIG. 3 is a perspective view showing a state in which the leaf spring is attached to the bearing member. FIG. 4 is a perspective view illustrating the state of applying grease to the shaft member. FIG. 5 is a perspective view of the encoder shown in FIG. It is A sectional drawing.

  As shown in FIG. 3, the leaf spring 5 is fixed to the inner bottom surface of the housing portion 23 of the bearing member 2 by heat caulking or the like.

  As shown in FIG. 4, grease 6 having water resistance is applied to the entire circumference slightly above the flange portion 12 of the shaft portion 11 of the shaft member 1.

  First, the frame member 4 is assembled to the bearing member 2 to which the leaf spring 5 is attached from the bearing portion 21 side of the bearing member 2. After that, the shaft member 1 coated with the grease 6 is inserted into the insertion hole 21 a of the bearing member 2. Next, the case member 3 is assembled to the bearing member 2, and the inclined portion 26 a on the first outer peripheral wall 26 side of the bearing member 2 is brought into contact with the inclined portion 33 a on the second outer peripheral wall 33 side of the case member 3. Finally, by bending the tab of the frame member 4, as shown in FIG. 5, the bearing member 2 and the case member 3 are held (clamped) by the frame member 4, and the assembly is completed.

  In the assembled state, the plate spring 5 engages between two adjacent convex portions 15 on the upper surface of the code plate attachment portion 13 of the shaft member 1, and the shaft member 1 is pressed against the case member 3 by the spring force of the plate spring 5. . As shown in FIG. 5, a part (upper part) of the flange portion 12 of the shaft member 1 is accommodated in the flange accommodating portion 25 of the bearing member 2, and an end surface (upper surface) located on the outer peripheral side of the groove portion 14 of the flange portion 12. A first gap portion 2 a is provided between the inner bottom surface of the flange housing portion 25. Further, a second gap 2 b is formed between the side surface (outer peripheral surface) of the flange portion 12 and the inner side surface (inner peripheral surface) of the flange housing portion 25. For easy understanding, the grease 6 is omitted in FIG.

In the encoder according to the embodiment of the present invention, waterproof means are provided at the following two locations.
(1) A gap between the shaft member 1 and the insertion hole 21a of the bearing member 2 (2) Below the abutting portion between the bearing member 2 and the case member 3, items of waterproofing measures taken in the above-mentioned parts, The effect will be described.

Of the parts where the above waterproofing measures are taken,
(1) The waterproof means for the gap between the shaft member 1 and the insertion hole 21a of the bearing member 2 is performed by filling the gap with grease.
Since there is a gap over the entire circumference of the shaft portion 11 between the insertion hole 21a of the shaft member 1 and the bearing member 2, it will be described below so that the grease 6 is filled over the entire circumference and partial grease breakage does not occur. It is configured.

  In the encoder according to the embodiment of the present invention, the grease 6 is uniformly applied over the entire circumference of the predetermined position of the shaft portion 11 by a dispenser capable of controlling the grease application conditions, and the grease application amount is managed to a specified amount. As a result, the grease filling state in the gap portion is made uniform.

  Furthermore, the area | region which can hold | maintain the grease 6 has the grease holding | maintenance part comprised by the annular groove part 14 provided in the some recessed part 24 and the extension line of these recessed parts 24, and the 1st space | gap part 2a, The region where the grease can be retained was enlarged as the second gap portion 2b.

In the encoder according to the embodiment of the present invention, the grease 6 applied to the shaft member 1 is forced into the plurality of recesses 24 by utilizing the decrease in the volume of the first gap 2a in the assembly process. Filling is avoided, and insufficient filling of the plurality of recesses 24 is avoided.
The process of forcibly filling the grease 6 will be described below with reference to FIG. FIG. 7 is an explanatory view showing a state of grease when the shaft member 1 is inserted into the bearing member 2. FIG. 7D shows a state where the shaft member 1 is inserted to the final position and the case member 3 is attached.

  When the shaft member 1 to which the grease 6 is applied is inserted into the insertion hole 21a of the bearing member 2, the grease 6 is in a state of being applied as shown in FIG. The flange member 25 of the bearing member 2 is inserted as it is.

  When the shaft member 1 is further inserted, as shown in FIG. 7B, a part of the grease 6 is drawn into the plurality of recesses 24, while the other part (remaining part) is pushed back, and the bearing member 2 The space formed by the inner bottom surface of the flange accommodating portion 25 and the end surface of the flange portion 12 of the shaft member 1 is filled.

  When the shaft member 1 is further inserted, as shown in FIG. 7C, the space formed by the inner bottom surface of the flange accommodating portion 25 of the bearing member 2 and the end surface of the flange portion 12 of the shaft member 1 is filled with the grease 6. In addition, the other part 2b is constituted by the inner side surface (inner peripheral surface) of the flange accommodating portion 25 of the bearing member 2 and the side surface (outer peripheral surface) of the flange portion 12 of the shaft member 1. Infiltrate.

  When the shaft member 1 is inserted to the final insertion position, that is, the position where the tip of the protrusion on the end surface of the shaft member 1 located around the hole portion 17 comes into contact with the bottom surface of the housing portion 31 of the case member 3, FIG. ), The volume of the space formed by the inner bottom surface of the flange accommodating portion 25 of the bearing member 2 and the end surface of the flange portion 12 of the shaft member 1 is reduced, and only a slight gap is formed at the final insertion position. Is formed.

  At this time, the volume of the space formed by the inner bottom surface of the flange accommodating portion 25 of the bearing member 2 and the end surface of the flange portion 12 of the shaft member 1 is reduced, so that the grease 6 held in this space is pushed out. The part enters the plurality of recesses 24 and the other part enters the second gap 2b. At this time, since the gaps between the plurality of recesses 24 are larger than the gaps between the second gaps 2b, more grease 6 enters the plurality of recesses 24 and the insufficient filling of the grease 6 in the plurality of recesses 24 is resolved. Is done.

  As described above, the forced filling of the grease 6 into the plurality of recesses 24 by the insertion of the shaft member 1 into the bearing member 2 is completed.

  However, since there is still a possibility that the grease 6 is not uniformly filled into the plurality of recesses 24, in the encoder according to the embodiment of the present invention, in addition, the open ends of the plurality of recesses 24 are connected to the annular groove 14. Opposed to. As a result, when the filling amount of the grease 6 varies between the plurality of recesses 24, the shaft member 1 is rotated, so that the grease 6 moves from the recess 24 with a large filling amount of the grease 6 to the groove portion 14, The grease 6 is replenished from the groove 14 to the recess 24 with a small amount of grease 6 filled, and the filling state of the grease 6 is made substantially uniform throughout the plurality of recesses 24.

  In addition, by providing the first gap 2a continuously with the annular groove 14 and the second gap 2b continuously with the first gap 2a, when the amount of the grease 6 applied is large, When the member 1 is rotated, excess grease 6 in the plurality of recesses 24 is pushed out into the first gap 2a and further into the second gap 2b, and when the amount of the grease 6 applied is small, the shaft 6 By rotating the member 1, the grease 6 is drawn into the plurality of recesses 24 from the second gap 2 b and further from the first gap 2 a, and the filling state of the grease 6 throughout the plurality of recesses 24 is further increased. It is made uniform.

  Further, by rotating and guiding the hole 17 at the end of the bearing member 2 with the projecting portion 34 of the case member 3, the portion that holds the rotation of the shaft member 1 is the tip of the insertion hole 21 a of the bearing member 2 and the case member. 3, and the interval between the portions holding the rotation is the maximum possible length. As a result, the deflection of the shaft member 1 during rotation is suppressed to a minimum, and fluctuations in the gap between the insertion hole 21a of the shaft member 1 and the bearing member 2 when the shaft member 1 is rotated can be minimized. Therefore, it is possible to suppress the occurrence of grease breakage due to the gap variation.

  By these waterproof means, the waterproof property of the gap between the shaft member 1 and the insertion hole 21a of the bearing member 2 can be obtained.

In addition, of the parts where waterproofing measures are taken,
(2) The waterproof means of the contact portion between the bearing member 2 and the case member 3 ensures that the contact portion (contact surface) between the bearing member 2 and the case member 3 sandwiched by the frame member 4 is in close contact. It was done by having a simple configuration.

That is, the bearing member 2 and the case member 3 are provided with outer peripheral walls, respectively, and as shown in FIG. 8, the inner surface of the first outer peripheral wall 26 of the bearing member 2 and the second outer peripheral wall 33 of the case member 3. Even if an error occurs in the size and shape of the bearing member 2 and the case member 3 by making the outer side surfaces inclined portions 26a and 33a with inclination angles θ1 and θ2, respectively, and contacting the inclined portions with each other, the inclined surfaces are inclined. One of the parts 26a and 33a is always in contact.
As a result, the inclined portions 26 a and 33 a are in close contact with the first outer peripheral wall 26 of the bearing member 2 and the second outer peripheral wall 33 of the case member 3, and the contact portion between the bearing member 2 and the case member 3 Waterproof properties can be obtained.

  Furthermore, a slight angle difference is provided between the inclination angle θ1 of the inclined portion 26a of the first outer peripheral wall 26 of the bearing member 2 and the inclination angle θ2 of the inclined portion 33a of the second outer peripheral wall 33 of the case member 3. Specifically, in the encoder according to the embodiment of the present invention, as shown in FIG. 8, the inclined portion 26 a of the first outer peripheral wall 26 of the bearing member 2 is made slightly vertical.

  As a result, as shown in FIG. 9, the contact portion 2 c includes the tip of the inclined portion 26 a of the first outer peripheral wall 26 of the bearing member 2 and the root of the inclined portion 33 a of the second outer peripheral wall 33 of the case member 3. It becomes. Since the contact portion 2c can be specified, the dimensional management of the parts is facilitated, and the first outer peripheral wall 26 of the bearing member 2 is elastically deformed over the entire height of the outer peripheral wall because the tip portion of the inclined portion 26a contacts. The first outer peripheral wall 26 is easily elastically deformed, and the first outer peripheral wall 26 of the bearing member 2 is elastically deformed even when there is a undulation or the like in the part shape, and the second outer peripheral wall 33 of the case member 3 is deformed. Following the shape, the effect that the entire region is easily adhered is obtained, and the waterproofness of the contact portion between the bearing member 2 and the case member 3 is improved.

  In addition, since both the first outer peripheral wall 26 and the second outer peripheral wall 33 are substantially rectangular, the straight portion of the rectangle is easily elastically deformed and firmly adhered, but the corner portion is strong and elastic. Difficult to deform. For this reason, if waviness or the like occurs in the inclined portions 26a and 33a of the corner portion, the shape does not follow, and the adhesion may be impaired. As a countermeasure against this, as shown in FIG. 6, bottomed holes 27 and 35 are provided in corner portions inside the outer peripheral walls of the bearing member 2 and the case member 3.

  As a result, even if the adhesion of the corner portion is impaired, the gap generated in the corner portion is very small and the amount of water intrusion is very small, so the water that has entered from the corner portion is provided in the vicinity of the corner portion. It is captured by the bottomed holes 27 and 35 and water is prevented from entering the encoder.

  In the encoder according to the embodiment of the present invention, the waterproof property is obtained by the configuration as described above. For example, the magnitude relationship between the end portion of the first outer peripheral wall 26 and the end portion of the second outer peripheral wall 33 is obtained. May be reversed. That is, the inclined portion (26a) is provided on the outer surface side of the end portion of the first outer peripheral wall 26, and the inclined portion (33a) opposed on the outer peripheral side of the inclined portion (26a) is provided on the second outer peripheral wall 33. It may be configured to be provided on the inner side surface at the end so that both inclined portions abut against each other. It is also possible to reverse the magnitude relationship between the inclination angle θ1 of the inclined portion 26a of the first outer peripheral wall 26 and the inclination angle θ2 of the inclined portion 33a of the second outer peripheral wall 33. Furthermore, even if a change such as adding an intermediate member having the same outer peripheral wall structure between the bearing member 2 and the case member 3 is added, the same waterproof property can be obtained.

  Further, a change that does not affect the waterproof property, for example, the slider 32 may be a movable side and the code plate 16 may be a fixed side. Further, even if the rotation holding structure of the shaft member 1 is changed such that the shaft member 1 side is a convex portion (projecting portion) and the case member 3 side is a concave portion (hole portion), equivalent waterproof characteristics can be obtained. .

DESCRIPTION OF SYMBOLS 1 Shaft member 11 Shaft part 12 Flange part 13 Code board attaching part 14 Groove part 15 Convex part 16 Code board (detection means)
17 Hole 2 Bearing member 21 Bearing 21a Insertion hole 22 Main body 23 Housing 24 Recess 25 Flange housing (recessed portion)
26 First outer peripheral wall 26a Inclined portion 27 Bottomed hole portion 2a First gap portion 2b Second gap portion 2c Contact portion 3 Case member 31 Housing portion 32 Slider (detection means)
33 Second outer peripheral wall 33a Inclined portion 34 Protruding portion 35 Bottomed hole portion 36 Terminal 4 Frame member 5 Leaf spring 6 Grease θ1 Inclination angle θ2 Inclination angle

Claims (4)

A bearing member having a cylindrical bearing portion;
A case member disposed to face the bearing member;
A frame member that holds the bearing member and the case member in contact with each other;
A shaft portion rotatably supported by the bearing portion, and a flange portion provided on one end side of the shaft portion; the shaft portion is inserted into the bearing portion and the other end side protrudes; and the flange portion is A shaft member housed in a housing portion constituted by a bearing member and the case member;
Detecting means for detecting the rotational movement of the shaft member;
In rotary electrical parts with
A plurality of recesses extending in the rotation axis direction of the shaft member are provided on the inner peripheral surface of the bearing portion with a circumferential interval, and one end of the recess opens the housing portion side of the bearing member. While being an open end, the other end side of the concave portion is provided continuously to the middle of the bearing portion,
An annular groove portion that circulates around the shaft portion is provided at a position on an extension line of the recess portion in the flange portion facing the open end of the recess portion,
The concave portion and the groove portion constitute a grease holding portion, and the grease is held in the grease holding portion,
The bearing member is provided with a first outer peripheral wall that goes around the entire circumference along the outer peripheral portion of the surface facing the case member,
On the surface of the case member facing the bearing member, a second outer peripheral wall that is overlapped with the first outer peripheral wall is provided over the entire circumference.
In the end portion of the first outer peripheral wall and the end portion of the second outer peripheral wall that are overlapped, an inclined portion is provided in which the front end side of the outer peripheral wall becomes thinner, respectively.
A difference in inclination angle between the inclined portion of the first outer peripheral wall and the inclined portion of the second outer peripheral wall ;
Rotating electrical parts characterized by The flange portion is formed to have a larger diameter than the shaft portion,
A surface of the bearing member on the side of the accommodating portion is provided with a recessed portion for accommodating a part of the flange portion, and the open end of the recessed portion is exposed on the inner bottom surface of the recessed portion,
Between the one end surface of the flange portion located on the outer peripheral side of the groove portion and the inner bottom surface of the recess portion is provided with a first gap portion connected to the grease holding portion,
A second gap portion connected to the first gap portion is provided between the outer peripheral surface of the flange portion and the inner peripheral surface of the hollow portion;
The rotating electrical component according to claim 1 , wherein: Providing a projecting portion or a hole having a circular cross section on the bottom surface of the case member facing the flange portion of the shaft member,
A hole or protrusion having a circular cross section is provided in the flange portion facing the bottom surface of the case member,
The hole portion or the protruding portion of the flange portion and the protruding portion or the hole portion of the case member are rotatably engaged;
And wherein, rotary electrical component according to claim 1 or 2. The first outer peripheral wall and the second outer peripheral wall are both rectangular.
Providing a bottomed hole portion recessed in a direction away from the case member at a corner portion inside the first outer peripheral wall of the bearing member;
Providing a bottomed hole portion recessed in a direction away from the bearing member at a corner portion inside the second outer peripheral wall of the case member;
The rotating electrical component according to any one of claims 1 to 3, wherein: