JP3719399B2 - Rotary encoder - Google Patents
Rotary encoder Download PDFInfo
- Publication number
- JP3719399B2 JP3719399B2 JP2001260518A JP2001260518A JP3719399B2 JP 3719399 B2 JP3719399 B2 JP 3719399B2 JP 2001260518 A JP2001260518 A JP 2001260518A JP 2001260518 A JP2001260518 A JP 2001260518A JP 3719399 B2 JP3719399 B2 JP 3719399B2
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- JP
- Japan
- Prior art keywords
- bearing
- shaft
- labyrinth
- outer ring
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Description
【０００１】
【発明の属する技術分野】
本発明は、ロータリエンコーダに関するもので、特に軸受部の密封構造に関するものである。
【０００２】
【従来の技術】
従来のロータリエンコーダは、ハウジングに軸受を介して回転自在に支持したシャフトに回転ディスクと取り付けるとともに、軸受と回転ディスク間のシャフト上にフリンガを介在させて軸受部を構成していた。
前記フリンガは、軸受を支持するハウジングとともに凹凸を設けてラビリンスを形成し、軸受内部のグリースなどの潤滑剤が漏れて回転ディスクに付着するのを防止していた。
また、軸受の外輪の反回転ディスク側を押さえる軸受押さえを、前記ハウジングに装着していた。
【０００３】
【発明が解決しようとする課題】
しかしながら、このような従来のロータリエンコーダにおいては、次のような問題があった。
(1)フリンガを取り付けることによって、ロータリエンコーダの全長が軸方向に伸び大形化する。
(2)フリンガや軸受押さえを別部品として取り付けるので、部品点数が増え、組立作業も面倒になる。
本発明は、このような問題を解消するためになされたもので、簡単な構成で、軸方向の寸法を長くすることなく、かつ部品点数が少なくて組立の容易な軸受密封構造を有するロータリエンコーダを提供することを目的とするものである。
【０００４】
【課題を解決するための手段】
上記問題を解決するため、本発明は、ハウジングに軸受を介して回転自在に支持されたシャフトと、前記シャフトに取り付けられた回転ディスクとを有するロータリエンコーダにおいて、前記ハウジングの軸受の外輪を受ける部分の一部分を削ってラビリンス凹部を形成し、前記シャフトに、前記軸受の外輪を超えるつば部を形成するとともに、前記つば部に、前記ラビリンス凹部に対応し、前記軸受の外輪と空隙を介して対向するラビリンス凸部を設けるようにしたものである。
【０００５】
【発明の実施の形態】
以下、本発明の実施例を図に基づいて説明する。
図１は本発明の実施例を示す側断面図である。
図において、１はシャフトで、軸受２を介して回転自在にハウジング３に支持されている。４は前記シャフトに取り付けられた回転ディスクである。
前記シャフト１には、前記軸受２の外輪２ａを超えるつば部１ａを形成するとともに、前記つば部１ａに、前記軸受外輪２ａの外側の一部分を覆うようなラビリンス凸部１ｂを設けている。また、前記ハウジング３には、シャフト１のラビリンス凸部１ｂと対応するように、軸受２の外輪２ａを受ける部分の一部分を削ってラビリンス凹部３ａを形成している。ハウジング３を削る寸法は、軸受２の軸方向長さの１／３以下が望ましい。この場合、軸受２の外輪２ａは少なくとも軸方向長さの２／３の部分でハウジング３と接着されるので、接着強度は問題ない。また、前記ハウジング３には、軸受２の外輪２ａの反回転ディスク側を押さえる軸受押さえ部３ｂを設けている。なお、２ｂは軸受２の内輪である。
このような構成において、シャフト１が回転して、軸受内部の潤滑剤などが漏れ出した場合、シャフト１のラビリンス凸部１ｂと、ハウジング３のラビリンス凹部３ａにより、潤滑剤などが回転ディスク４へ付着することが防止される。
また、シャフト１とハウジング３とで、簡単にラビリンス凸部１ｂ、ラビリンス凹部３ａ、および軸受押さえ部３ｂを形成することができるので、フリンガや軸受押さえなどの別部材をまったく用いる必要がない。
【０００６】
【発明の効果】
以上述べたように、本発明によれば、軸方向の全長を変えることなく、かつ部品点数を増やすことなく、しかも軸受の外輪を利用することで精度の良いラビリンス構造が得られ、軸受の潤滑剤などの漏れを防止する密封構造を実現できるという効果がある。
【図面の簡単な説明】
【図１】本発明の実施例を示す側断面図である。
【符号の説明】
１ シャフト、
１ａ つば部、
１ｂ ラビリンス凸部、
２ 軸受、
２ａ 外輪、
２ｂ 内輪、
３ ハウジング、
３ａ ラビリンス凹部、
３ｂ 軸受押さえ部、
４ 回転ディスク[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary encoder, and more particularly to a sealing structure for a bearing portion.
[0002]
[Prior art]
In the conventional rotary encoder, a rotating disk is attached to a shaft that is rotatably supported by a housing via a bearing, and a bearing is formed by interposing a flinger on the shaft between the bearing and the rotating disk.
The flinger is provided with irregularities together with a housing for supporting the bearing to form a labyrinth to prevent a lubricant such as grease inside the bearing from leaking and adhering to the rotating disk.
Further, a bearing retainer for restraining the outer ring of the bearing on the side opposite to the rotating disk is mounted on the housing.
[0003]
[Problems to be solved by the invention]
However, such a conventional rotary encoder has the following problems.
(1) By attaching a flinger, the entire length of the rotary encoder extends in the axial direction and becomes larger.
(2) Since the flinger and bearing retainer are attached as separate parts, the number of parts increases and the assembly work becomes troublesome.
The present invention has been made in order to solve such problems. A rotary encoder having a bearing sealing structure that has a simple configuration, does not increase the axial dimension, and has a small number of parts and can be easily assembled. Is intended to provide.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problem, the present invention provides a rotary encoder having a shaft rotatably supported by a housing via a bearing and a rotating disk attached to the shaft, and a portion for receiving an outer ring of the bearing of the housing. A labyrinth recess is formed by cutting a part of the shaft, and a collar portion that extends beyond the outer ring of the bearing is formed on the shaft, and the collar portion corresponds to the labyrinth recess and faces the outer ring of the bearing via a gap. The labyrinth convex part to be provided is provided.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side sectional view showing an embodiment of the present invention.
In the figure, reference numeral 1 denotes a shaft, which is rotatably supported by a housing 3 via a bearing 2. Reference numeral 4 denotes a rotating disk attached to the shaft.
The shaft 1 is formed with a collar portion 1a that exceeds the outer ring 2a of the bearing 2, and the collar portion 1a is provided with a labyrinth convex portion 1b that covers a part of the outer side of the bearing outer ring 2a. The housing 3 has a labyrinth recess 3a formed by shaving a portion of the bearing 2 that receives the outer ring 2a so as to correspond to the labyrinth projection 1b of the shaft 1. The dimension for cutting the housing 3 is desirably 1/3 or less of the axial length of the bearing 2. In this case, since the outer ring 2a of the bearing 2 is bonded to the housing 3 at least at 2/3 of the axial length, there is no problem with the bonding strength. Further, the housing 3 is provided with a bearing pressing portion 3b for pressing the outer ring 2a of the bearing 2 against the counter-rotating disk side. Reference numeral 2b denotes an inner ring of the bearing 2.
In such a configuration, when the shaft 1 rotates and lubricant or the like inside the bearing leaks out, the lubricant or the like is transferred to the rotating disk 4 by the labyrinth convex portion 1 b of the shaft 1 and the labyrinth concave portion 3 a of the housing 3. It is prevented from adhering.
Moreover, since the labyrinth convex part 1b, the labyrinth concave part 3a, and the bearing pressing part 3b can be easily formed by the shaft 1 and the housing 3, it is not necessary to use a separate member such as a flinger or a bearing pressing at all.
[0006]
【The invention's effect】
As described above, according to the present invention, an accurate labyrinth structure can be obtained without changing the overall length in the axial direction, without increasing the number of parts, and by using the outer ring of the bearing. There is an effect that a sealing structure for preventing leakage of the agent can be realized.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an embodiment of the present invention.
[Explanation of symbols]
1 shaft,
1a collar part,
1b Labyrinth convex part,
2 bearings,
2a outer ring,
2b inner ring,
3 Housing,
3a Labyrinth recess,
3b Bearing holding part,
4 Rotating disc
Claims (1)
前記ハウジングの軸受の外輪を受ける部分の一部分を削ってラビリンス凹部を形成し、
前記シャフトに、前記軸受の外輪を超えるつば部を形成するとともに、前記つば部に、前記ラビリンス凹部に対応し、前記軸受の外輪と空隙を介して対向するラビリンス凸部を設けたことを特徴とするロータリエンコーダ。In a rotary encoder having a shaft rotatably supported by a housing via a bearing, and a rotating disk attached to the shaft,
A portion of the housing that receives the outer ring of the bearing is shaved to form a labyrinth recess,
The shaft is formed with a collar portion that exceeds the outer ring of the bearing, and the collar portion is provided with a labyrinth convex portion that corresponds to the labyrinth concave portion and faces the outer ring of the bearing via a gap. Rotary encoder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001260518A JP3719399B2 (en) | 2001-08-30 | 2001-08-30 | Rotary encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001260518A JP3719399B2 (en) | 2001-08-30 | 2001-08-30 | Rotary encoder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003065800A JP2003065800A (en) | 2003-03-05 |
| JP3719399B2 true JP3719399B2 (en) | 2005-11-24 |
Family
ID=19087704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001260518A Expired - Fee Related JP3719399B2 (en) | 2001-08-30 | 2001-08-30 | Rotary encoder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3719399B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4988245B2 (en) * | 2006-05-01 | 2012-08-01 | 株式会社リコー | Roller device, belt device, and image forming apparatus |
-
2001
- 2001-08-30 JP JP2001260518A patent/JP3719399B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2003065800A (en) | 2003-03-05 |
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