WO2002054016A1 - Movable magnet type measuring instrument - Google Patents
Movable magnet type measuring instrument Download PDFInfo
- Publication number
- WO2002054016A1 WO2002054016A1 PCT/JP2001/010867 JP0110867W WO02054016A1 WO 2002054016 A1 WO2002054016 A1 WO 2002054016A1 JP 0110867 W JP0110867 W JP 0110867W WO 02054016 A1 WO02054016 A1 WO 02054016A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnet rotor
- wall surface
- damper oil
- cavity
- rotating shaft
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/02—Bearings or suspensions for moving parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/10—Elements for damping the movement of parts
- G01D11/12—Elements for damping the movement of parts using fluid damping
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R7/00—Instruments capable of converting two or more currents or voltages into a single mechanical displacement
- G01R7/04—Instruments capable of converting two or more currents or voltages into a single mechanical displacement for forming a quotient
- G01R7/06—Instruments capable of converting two or more currents or voltages into a single mechanical displacement for forming a quotient moving-iron type
Definitions
- the present invention relates to a movable magnet type instrument for driving a pointer of a pointer type instrument for an automobile, for example.
- a cross coil type movable magnet type instrument which rotates a magnet rotor composed of a permanent magnet in accordance with the amount of current flowing through the cross coil has been widely used.
- a magnet rotor having a rotating shaft at the center is housed in a frame (pobin case) made of a resin material and supported by a shaft. Be composed.
- the frame body is filled with damper oil.
- the movable magnet type instrument constructed in this way' may be temporarily tilted or turned upside down, for example, during the assembling process, which causes the damper oil to move to the side of the rotating shaft inside the frame.
- a damper oil leakage prevention is provided by providing an annular damper oil migration prevention coating on the bottom surface of the frame.
- there is a method for preventing damper oil leakage by forming irregularities on the inner wall surface of the frame and the outer wall surface of the magnet rotor. is there. '
- the present invention has been made in view of this point, and a main object of the present invention is to provide a movable magnet type instrument that is inexpensive and that can suppress the leakage of damper oil while reducing the influence on the operating characteristics of the pointer. Will not be provided. Disclosure of the invention
- a movable magnet type meter includes a magnet rotor having a rotating shaft, a frame housing the magnet rotor, having a cavity, and supporting the rotating shaft; and A coil for driving the magnet rotor, and damper oil contained in the cavity, and suppresses transfer of the damper oil to at least one of an outer wall surface of the magnet rotor or an inner wall surface of the cavity.
- FIG. 1 is a cross-sectional view showing a state after assembling a movable magnet type instrument according to an embodiment of the present invention
- a movable magnet type instrument comprises a rotating shaft 1, a magnet rotor 2 penetratingly fixed to the rotating shaft 1, and a cavity for accommodating the magnet rotor 2. 3, a frame 4 supporting the rotating shaft 1 and a pair of coils 5, 6 wound around the outer periphery of the frame 4 so as to intersect at right angles to each other; A plurality of terminals 7, 8 which are held by the extension frame 4 in parallel with and are electrically connected to the coils 5, 6, and the rotating shaft 1 and the distal end of the terminal 7 are opened to open the frame 4.
- the main part except the rotating shaft 1 is located behind the circuit board 10 which is an external electric member, and the driven shaft 1 is mounted on the circuit board 10. , And is mounted on the circuit board 10 so as to extend forward.
- the magnet rotor 2 is made of a disc-shaped plastic magnet having two N-poles and two S-poles magnetized in the radial direction about the rotation axis 1, and the rotation axis 1 is fixed at the center thereof in a penetrating state. I have.
- the frame 4 is a so-called coil bobbin having a cavity 3 for accommodating the magnet rotor 2 inside by combining an upper half 41 and a lower half 42 each made of a synthetic resin. And a cylindrical portion 43 that constitutes an upper bearing portion of the rotating shaft 1 that penetrates the circuit board 10 together with the rotating shaft 1 and a columnar portion that serves as a winding guide for the coils 5 and 6. And a hole-shaped terminal storage section 44 for storing and holding the terminals 7 and 8.
- the inner wall 3 1 of the cavity 3 facing the outer wall 2 1 of the magnet rotor 2 the bottom inner wall 3 2 of the cavity 3 facing the bottom outer wall 2 2 of the magnet rotor 2, (below As shown in FIG.
- a rough surface portion S having a surface roughness of, for example, about 50 ⁇ m is formed on the corresponding surface of the side half body 42).
- the rough surface portion S is formed when the respective halves 41 and 42 are injection-molded with a synthetic resin.
- the surface of the molding die to be formed is provided with fine irregularities formed by shaving off by electric discharge machining or corrosion forming by etching.
- the cavity 3 thus formed is filled with damper oil D.
- the damper oil D is supplied to the bottom side of the magnet rotor 2.
- Damping oil D is located in the bottom side region of the cavity 3 and is interposed between the outer wall surface 21 of the magnet rotor 2 and the inner wall surface 31 of the cavity 3 to apply a braking force to the magnet rotor 2,
- c are to have a braking effect on the guidance (not shown) for moving axis times in accordance with the linked meter surveying the rotation shaft 1, in the state shown in FIG.
- the damper oil D is the above-mentioned Although it is located on the bottom side of the cavity 3 including the bottom outer wall 22 of the magnet rotor 2 and the bottom inner wall 32 of the cavity 3 opposed thereto, for example, it is temporarily Can be tilted or inverted. At this time, there is a concern that the damper oil D moves to the cylindrical portion 43 side of the frame 4 that is the protrusion side of the rotating shaft 1 and leaks to the outside through a gap between the damper oil D and the rotating shaft 1. Since the cavity 3 is provided with the roughened surface portion S for suppressing the transfer of the damper oil D, the roughened surface portion S makes the damper oil D hard to flow and suppresses the oil leakage.
- the rough surface portion S is formed on the bottom inner wall surface 32 of the hollow portion 3 facing the bottom outer wall surface 22 of the magnet rotor 2, so that the special coating is formed as in the related art. It is possible to suppress the leakage of the damper oil D with an inexpensive configuration without forming it, and to improve product reliability.
- the migration of the damper oil D can be suppressed without forming a large uneven portion between the outer wall surface of the magnet rotor and the inner wall surface of the cavity as in the related art.
- the effect on the operating characteristics of the device can be reduced.
- the lower half 42 is formed by providing a rough surface S on the bottom inner wall 32 avoiding the side surface (inner wall 31) of the cavity 3. Becomes easier.
- the rough surface S is provided on the bottom inner wall surface 32 of the cavity 3.
- the bottom outer wall surface 2 2 of the magnet rotor 2 and the bottom outer wall surface 2 2 and the bottom inner wall surface 3 2 2 may be provided.
- the damper oil D can be provided at a place other than the place where the oil D easily stays, and the formation position is located on the outer wall surface 21 of the magnet rotor 2 or the inner wall surface 31 of the cavity 3. Of these, at least one of them is optional as long as it is formed at a position where the leakage due to the transfer of the damper oil D can be suppressed, and the surface roughness of the rough surface S is fine enough to not significantly impair the operating characteristics of the pointer. It only has to be set.
- the coils 5 and 6 are directly wound around the outer periphery of the frame 4 .
- a dedicated coil holder for holding the coils 5 and 6 is separately provided, and the coil holder is attached to the frame 4. May be attached.
- the coils 5, 6 may be arranged to face the magnet rotor 2 without crossing each other.
- the location where the rough surface portion S is formed is not limited to the above-described embodiment. It can be provided at any position on the wall surface 21 or the inner wall surface 31 of the cavity 3. Industrial applicability
- the present invention is applicable to a movable magnet type instrument that drives a pointer of an instrument for a vehicle, which is mounted on various vehicles including an automobile pie.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Instrument Panels (AREA)
- Fluid-Damping Devices (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01272807A EP1279933A4 (en) | 2000-12-28 | 2001-12-11 | MEASURING INSTRUMENT OF THE TYPE WITH MOVING MAGNET |
KR1020027010900A KR20020081341A (ko) | 2000-12-28 | 2001-12-11 | 가동자석식 계기 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000399701A JP3477710B2 (ja) | 2000-12-28 | 2000-12-28 | 可動磁石式計器 |
JP2000-399701 | 2000-12-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002054016A1 true WO2002054016A1 (en) | 2002-07-11 |
Family
ID=18864428
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/010867 WO2002054016A1 (en) | 2000-12-28 | 2001-12-11 | Movable magnet type measuring instrument |
Country Status (6)
Country | Link |
---|---|
US (1) | US20030011356A1 (ja) |
EP (1) | EP1279933A4 (ja) |
JP (1) | JP3477710B2 (ja) |
KR (1) | KR20020081341A (ja) |
CN (1) | CN1406335A (ja) |
WO (1) | WO2002054016A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120118220A1 (en) * | 2009-07-21 | 2012-05-17 | Masahiro Watanabe | Instrument drive device |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004006290A1 (de) * | 2003-05-19 | 2004-12-23 | Siemens Ag | Inkrementeller Antrieb |
JP5880922B2 (ja) * | 2011-09-22 | 2016-03-09 | 日本精機株式会社 | 交差コイル式計器 |
KR102260144B1 (ko) | 2021-01-04 | 2021-06-09 | 주식회사 유림테크 | 가동 코일형 절연저항 및 전압 계기 장치 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01164817A (ja) * | 1987-12-17 | 1989-06-28 | Kubota Ltd | 摺動特性にすぐれた軸受構造 |
JPH09182367A (ja) * | 1995-12-26 | 1997-07-11 | Nippon Densan Corp | 動圧流体軸受を備えたモータ |
JP3061128B2 (ja) * | 1998-10-08 | 2000-07-10 | セイコーエプソン株式会社 | カッター付きプリンタ |
JP2000249146A (ja) * | 1999-03-01 | 2000-09-12 | Yokoi Sangyo Kk | 摺動面の潤滑構造 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4492920A (en) * | 1981-06-22 | 1985-01-08 | Beede Electrical Instrument Co., Inc. | Electric indicator with return-to-zero feature and compensating coil to cancel the return-to-zero feature during measurement |
JPH0725708Y2 (ja) * | 1990-04-23 | 1995-06-07 | 矢崎総業株式会社 | クロスコイル形指示計器 |
-
2000
- 2000-12-28 JP JP2000399701A patent/JP3477710B2/ja not_active Expired - Lifetime
-
2001
- 2001-12-11 CN CN01805669A patent/CN1406335A/zh active Pending
- 2001-12-11 US US10/204,559 patent/US20030011356A1/en not_active Abandoned
- 2001-12-11 EP EP01272807A patent/EP1279933A4/en not_active Withdrawn
- 2001-12-11 KR KR1020027010900A patent/KR20020081341A/ko not_active Application Discontinuation
- 2001-12-11 WO PCT/JP2001/010867 patent/WO2002054016A1/ja not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01164817A (ja) * | 1987-12-17 | 1989-06-28 | Kubota Ltd | 摺動特性にすぐれた軸受構造 |
JPH09182367A (ja) * | 1995-12-26 | 1997-07-11 | Nippon Densan Corp | 動圧流体軸受を備えたモータ |
JP3061128B2 (ja) * | 1998-10-08 | 2000-07-10 | セイコーエプソン株式会社 | カッター付きプリンタ |
JP2000249146A (ja) * | 1999-03-01 | 2000-09-12 | Yokoi Sangyo Kk | 摺動面の潤滑構造 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120118220A1 (en) * | 2009-07-21 | 2012-05-17 | Masahiro Watanabe | Instrument drive device |
Also Published As
Publication number | Publication date |
---|---|
EP1279933A1 (en) | 2003-01-29 |
EP1279933A4 (en) | 2004-10-20 |
KR20020081341A (ko) | 2002-10-26 |
JP2002202324A (ja) | 2002-07-19 |
JP3477710B2 (ja) | 2003-12-10 |
US20030011356A1 (en) | 2003-01-16 |
CN1406335A (zh) | 2003-03-26 |
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