CN1048454A - Eddy current meter - Google Patents
Eddy current meter Download PDFInfo
- Publication number
- CN1048454A CN1048454A CN90103288A CN90103288A CN1048454A CN 1048454 A CN1048454 A CN 1048454A CN 90103288 A CN90103288 A CN 90103288A CN 90103288 A CN90103288 A CN 90103288A CN 1048454 A CN1048454 A CN 1048454A
- Authority
- CN
- China
- Prior art keywords
- guiding elements
- installation component
- needle pivot
- scale
- bridging board
- 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.)
- Granted
Links
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/49—Devices characterised by the use of electric or magnetic means for measuring angular speed using eddy currents
- G01P3/495—Devices characterised by the use of electric or magnetic means for measuring angular speed using eddy currents where the indicating means responds to forces produced by the eddy currents and the generating magnetic field
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
- G01P1/02—Housings
- G01P1/026—Housings for speed measuring devices, e.g. pulse generator
Abstract
In an eddy current meter with gauge pointer axle, the axle that is driven in rotation, ring-type permanent magnet, cup-shaped magnetic strength member, instrument housing, bridging board, needle pivot guiding elements, scale installation component etc., in assembling process all be between plastic needle pivot guiding elements and scale installation component, and shoot in the needle pivot guiding elements rather than directly shoot in the metal bridge fishplate bar with a plurality of self-tapping screws the scale plate is fixed on the metal bridge fishplate bar indirectly by the scale installation component by bridging board is clamped in.Thereby therefore avoided metal powder to produce and enter the reliability of having improved pointer action in the needle pivot supporting member.
Description
The present invention relates to a kind of eddy current meter that is suitable for as the motor vehicles velograph, relate to the eddy current meter that a kind of its pointer can be swung reposefully specifically.
A kind of eddy current type motor vehicles velograph uses widely in automobile, in this velograph, a ring-type permanent magnet that is fixed on the axle that velamen rotation drives, by a gear train be rotated come according to occur in permanent magnet with the eddy current that in cup-shaped magnetic strength plate, flows between magnetic force with this cup-shaped magnetic strength plate around a pivot swinging, make be fixed to can around the motor vehicles speed indicator on the magnetic strength plate of pivot swinging be driven in rotation spool rotating speed indicate the speed of motor vehicles with being directly proportional.
Fig. 1 (A) and Fig. 1 (B) illustrate the eddy current type motor vehicles velograph of a prior art.In Fig. 1 (A), a cylindrical shape instrument housing 10 is bearing on the instrument framework 1; An axle 2 that is driven in rotation can be rotated to support on the instrument housing 1 by a bearing; Cup-shaped iron member 3, lining 4, ring-type permanent magnet 5 and magnetic flux adjust discoid plate 6(be used for compensation magnets 5 with variation of temperature) all be arranged on the downsides of instrument housing 10 mutually coaxially.The axle 2 that is driven in rotation is rotated by a flexible shaft (not shown) by a gear train (not shown).In addition, rotated by a flexible shaft (not shown) by a gear train (not shown) at the axle 2 that is driven in rotation.In addition, be formed with a cylindrical shape hollow parts 2a, have a pivot suspension member 7 dresses the least significant end 8a of needle pivot 8 within it with rotatably support in the upper end of the axle 2 that is driven in rotation.A cup-shaped magnetic strength member 9 is fixed on this needle pivot 8 by a lining 9A, and the cylindrical shape of this cup-shaped magnetic strength member partly was clipped within the interior week of the periphery of annular magnet 5 and cup-shaped iron member 3.In addition, there is a bridging board 11 to be fixed to the upper end of instrument housing 10; Needle pivot 8 can be rotated to support on this bridging board 11; A spiral disc spring 12 is arranged on the bridging board 11, the inner of disc spring 12 is fixed on the needle pivot 8, the outer end of disc spring 12 is fixed on the member that is fixed on the bridging board 11, and therefore the torque that takes place between magnet 5 and magnetic strength member balances each other with the elastic torque of spiral disc spring 12.In addition, though do not illustrate, there is a root pointer (not shown) to be fixed on this needle pivot 8.
On the other hand, below cup-shaped iron member 3, the axle that is being driven in rotation is formed with one first worm screw 13A on 2, it engages with unshowned first worm gear, and that be fixed together coaxially with this first worm gear, unshowned second worm screw engages with the rotation of the axle 2 that will be driven in rotation with one second worm gear 13B successively and is delivered to a revolution indicator (integrating indicator or odometer) 17 by a driving-chain of being made up of a plurality of gearings 14,15,16 etc.
In the prior art eddy current meter of constructing like this, because one rotatablely moves and is delivered on the axle 2 that is driven in rotation from gearing by the relation that is directly proportional with the speed of a motor vehicle, permanent magnet 5 is rotated, thereby magnet and and 9 of magnetic strength members owing to may produce a proportional torque of rotating speed of following permanent magnet 5 with between the eddy current that induces on the surface of cup-shaped magnetic strength member 9, producing a reacting force at the magnetic flux of magnet 5.Therefore, needle pivot 8 is just swung on the position, and the torque that is caused by eddy current on this position balances each other with the elastic force of spiral disc spring 12, thereby the pointer (not shown) indicates the speed of a motor vehicle on speed of a motor vehicle scale.
Fig. 1 (B) illustrates the mounting structure of a prior art scale plate, in this structure, by two self-tapping screws 20 being screwed in the metal bridge fishplate bar 11 scale plate 19 is fixed on the scale installation component 18.In detail, the scale installation component of being made by synthetic resin 18 is shaped as a rectangular-shaped piece, and it has two cylindrical mounting portion 18A, is located at respectively on its two ends.Partly be formed with a hole 18a who wears screw in the 18A in each cylindrical installation.In addition, be formed with the hole 19a that wears mounting screw that two its positions follow the cylindrical corresponding position of wearing screw hole 18a that part 18A is installed of scale installation component 18 to be complementary on the scale plate 19.
Therefore,, two self-tapping screws 20 are inserted these respectively wear screw hole 19a and 18a, and attack the whole thickness of bridging board 11 for scale plate 19 is fixed on the bridging board 11 by scale installation component 18.At this, self-tapping screw is a kind of screw of drill bit type, and it can be screwed into and penetrate a relatively thinner plate, forms a threaded hole simultaneously on this thin plate.
In addition, be formed with a center pit 18b on the scale installation component 18; The cylindrical installation partly is formed with an outer axial groove 18c who stretches on its outer surface on the 18A; Also be formed with the slotted eye 11b of a center pit 11a and two symmetric arrangement on the bridging board 11.On the other hand, the central cylindrical boss that is formed with a carrier finger needle shaft upper end on the needle pivot guiding elements 21 that is made by synthetic resin is 21A and two arm part 21B that symmetry stretches partly, and each arm part has one can install partly 21b of claw type that outer axial slot part part 18c of 18A partly engages with scale installation component 18 cylindrical.
Therefore, needle pivot guiding elements 21 install on the bridging board 11 be by with cylindrical boss partly 21A insert in the center pit 18b of the center pit 11a of bridging board 11 and scale installation component 18, simultaneously arm part 21B of symmetry on two is inserted respectively in two slotted eye 11b until two claw types of needle pivot guiding elements 21 partly 21b realize with on the corresponding axial groove 18c joint of scale installation component 18.In addition, in Fig. 1 (B), the boss that one of label 22 indication is contained in needle pivot guiding elements 21 is the thrust bearing on the top of 21A partly.
But, in the eddy current meter of above-mentioned prior art, because scale plate 19 is by being secured on the bridging board 11 in the surface of two self-tapping screws 20 being passed scale installation component 18 and being screwed into the bridging board of being made by metal (for example iron) 11, therefore just there is a problem, when self-tapping screw is fastened, can produce metal powder, simultaneously metal powder can drop in the hollow part 2a of driven axle 2 (being illustrated on Fig. 1 (A)), thereby needle pivot 8 can not be rotated reposefully, or cause vibration so that cause indicating incorrect, or produce abnormal sound.
Therefore, at these problems, main purpose of the present invention is that a kind of eddy current meter will be provided, the needle pivot of this instrument, when being fixed to the scale plate on the bridging board, owing to avoided metal powder to produce and dropped in the pivot suspension member that is contained on the axle that is driven in rotation and can be reposefully and correctly rotate, do not produced abnormal sound.
In order to achieve the above object, eddy current meter according to the present invention has: (a) gauge pointer axle (8); (b) axle (2) of velamen rotation driving; (c) ring-type permanent magnet (5) that is fixed to coaxially on this axle that is driven in rotation; (d) cup-shaped magnetic strength member (9) that is fixed to coaxially on this gauge pointer axle with the periphery that covers this ring-type permanent magnet (5); (e) instrument housing (10) that holds this ring-type permanent magnet and this cup-shaped magnetic strength member; (f) one is arranged on the top of this cup-shaped magnetic strength member and is fixed to bridging board (11) on this instrument housing, and (g) one installs on this bridging board to guide the needle pivot guiding elements (21) of this gauge pointer axle rotationally; (h) a scale plate (19); (i) one is installed on this bridging board by self-tapping screw (20) this scale plate is fixed to scale installation component (18) on this bridging board.This eddy current meter is characterised in that: this scale plate (19) be by this bridging board (11) is clamped between this needle pivot guiding elements (21) and this scale installation component (18), and with a plurality of self-tapping screws shoot in this needle pivot guiding elements (21) this scale plate (19) is fixed to this scale installation component (18) thus on be fixed to indirectly on the bridging board (11).
Needle pivot guiding elements (21) is made by synthetic resin, and be formed with two arm parts (21B) of stretching symmetrically and two terminations that are located at arm part respectively, respectively have a cylindrical plug part (21C) of a little center pit (21c); Scale installation component (18) is made by synthetic resin, and be formed with two that be provided with symmetrically, respectively have cylindrical an installations part (18A) of an endoporus with the level (18a); Two cylindrical plugs of this of this needle pivot guiding elements (21) partly (21C) are respectively charged in this band inner bore of step (18a) of this scale installation component (18), and this bridging board (11) is clamped between this needle pivot guiding elements (21) and this scale installation component (18).
Two cylindrical plugs of described needle pivot guiding elements (21) partly respectively are formed with a claw type partly (21d) on (21C), two of described scale installation component (18) are cylindrical install respectively be formed with on partly (18A) one install to this scale installation component (18) at this needle pivot guiding elements (21) can be when going up with the corresponding claw type of this needle pivot guiding elements (21) (21d) interior axial groove (18c) of engaging partly.
In eddy current meter according to the present invention, because in assembling process moderate plate is by bridging board being clamped between the scale installation component that needle pivot guiding elements that synthetic resin makes and synthetic resin makes, and be screwed in the needle pivot guiding elements that this synthetic resin makes rather than directly be screwed in the metal bridge fishplate bar with a plurality of self-tapping screws and the scale plate is fixed on the scale installation component that synthetic resin makes, thereby be fixed to indirectly on the metal bridging board, just might avoid the generation metal powder, thereby eliminate the pointer vibration, incorrect indication and eliminated abnormal sound.
The superior feature and the advantage of instrument of the ratio prior art of eddy current meter of the present invention will more be expressly understood from the description below in conjunction with accompanying drawing.In these accompanying drawings, corresponding element is with identical label, wherein:
Fig. 1 (A) be one longitudinally, the view that cuts of part, the example of the eddy current meter of a prior art is shown;
Fig. 1 (B) is the cut-open view of an amplification, and a main part of the eddy current meter of the prior art shown in Fig. 1 (A) is shown;
Fig. 2 is a longitudinal sectional view, and an embodiment of eddy current meter of the present invention is shown; With
Fig. 3 is a front view, and the eddy current meter that is provided with vehicle ' distance counting meter of the present invention is shown.
An embodiment of eddy current meter of the present invention will make a more detailed description in conjunction with the accompanying drawings.The characteristics of this embodiment are a scale plate is installed to a mounting structure on the bridging board.Other structure of present embodiment is the same with the instrument of prior art basically, and the same parts in addition that therefore have identical function are keeping same label, no longer repeat to describe in detail.
In Fig. 2, scale plate 19 is screwed into by scale installation component 18, with two self-tapping screws that (not being directly to be screwed in the metal bridging board 11) is fixed on the needle pivot guiding elements 21 in the needle pivot guiding elements 21 that synthetic resin makes as in prior art.In detail, the scale installation component of being made by synthetic resin 18 is shaped as a rectangular-shaped piece, and it has partly 18A of two symmetrically arranged cylindrical installations, is located at respectively on its two ends.In each cylindrical installation part 18A, be formed with an endoporus 18a with the level with a little hole of wearing screw and a big hole that holds guiding elements.There is a center pit 18b to be formed on the center of scale installation component 18.Form an interior axial groove 18c who axially stretches on the surface in 18A partly within it each cylindrical installs.
Be formed with the hole 19a of two mounting screws on the scale plate 19, the cylindrical position that the hole of wearing screw accordingly of part 18A is installed with scale installation component 18 is complementary in the position for they.
On the other hand, be formed with on the needle pivot guiding elements of making by synthetic resin 21 one in order to the upper end of carrier finger needle shaft 8, the cylindrical boss at center partly 21A, two arm part 21B that stretch symmetrically and two respectively have a little center pit 21c and one can be with the axial groove of the cylindrical mount pad 18A of scale installation component 18 claw type that engages of the 18c cylinder stopper 21C partly of 21d partly partly.
In when assembling, needle pivot guiding elements 21 install on the bridging board 11 be by with cylindrical boss partly the 21A center pit 11a that inserts bridging board 11 and the center pit 18b of scale installation component 18, simultaneously with two cylindrical plugs partly 21C in the corresponding band stepped hole 18a of following insertion scale installation component 18 up to the claw type of needle pivot guiding elements 21 partly 21d follow the corresponding axial groove 18c of scale installation component 18 flexibly to engage to realize.Along with, with two self-tapping screws 20 be screwed into respectively two cylindrical plugs partly 21C little center pit 21c, bridging board 11 is clamped between scale installation component 18 and the needle pivot guiding elements 21 scale plate 19 is fixed on the bridging board 11 indirectly by scale installation component 18.In addition, in Fig. 2, label 12 is spiral disc springs that are fixed on the needle pivot 8.
Fig. 3 illustrates one with an odometer 17(integrating indicator) front view of the eddy current meter of the present invention that is assembled together.In addition, in Fig. 3, also show the scale installation component 18 of rectangle.
In pressing the eddy current meter of above-mentioned design, because self-tapping screw 20 is to shoot cylindrical plug that two synthetic resin of needle pivot guiding elements 21 make partly among the center pit 21c of 21C, therefore self-tapping screw 20 be by make stopper partly the 21C elastic deformation be fastened on cylindrical plug partly in the 21C, produce metal powder can be in the eddy current meter of prior art.Therefore just might by eliminated pointer vibration, pointer indication incorrect, eliminated the reliability that abnormal sound has improved the pointer indication.
Claims (3)
1, a kind of eddy current meter, it has:
(a) a gauge pointer axle (8);
(b) axle (2) of velamen rotation driving;
(c) ring-type permanent magnet (5) that is fixed to coaxially on this axle that is driven in rotation;
(d) cup-shaped magnetic strength member (9) that is fixed to coaxially on this gauge pointer axle with the periphery that covers this ring-type permanent magnet (5);
(e) instrument housing (10) that holds this ring-type permanent magnet and this cup-shaped magnetic strength member;
(f) one is arranged on the top of this cup-shaped magnetic strength member and is fixed to bridging board (11) on this instrument housing;
(g) one installs on this bridging board to guide the needle pivot guiding elements (21) of this gauge pointer axle rotationally;
(h) a scale plate (19); With
(i) one is installed on this bridging board by self-tapping screw (20) this scale plate being fixed to scale installation component (18) on this bridging board,
It is characterized in that:
Described scale plate (19) be by described bridging board (11) is clamped between described needle pivot guiding elements (21) and the described scale installation component (18), and with a plurality of self-tapping screws shoot in this needle pivot guiding elements (21) this scale plate (19) is fixed to this scale installation component (18) thus on be fixed to indirectly on this bridging board (11).
2, by the eddy current meter of claim 1, it is characterized in that:
(a) this needle pivot guiding elements (21) is made by synthetic resin, and be formed with two arm portions (21B) that stretch symmetrically and two terminations that are located at arm part respectively, respectively have a cylindrical plug part (21C) of a little center pit (21c).
(b) this scale installation component (18) is made by synthetic resin, and be formed with on two be provided with symmetrically, respectively have cylindrical an installations part (18A) of an endoporus with the level (18a); With
(c) two cylindrical plugs parts of this of this needle pivot guiding elements (21) (21C) are respectively charged in this band inner bore of step (18a) of this scale installation component (18), and this bridging board (11) is clamped between this needle pivot guiding elements (21) and this scale installation component (18).
3, press the eddy current meter of claim 1, two cylindrical plugs that it is characterized in that described needle pivot guiding elements (21) partly respectively are formed with a claw type partly (21d) on (21C), two of described scale installation component (18) are cylindrical install respectively be formed with on partly (18A) one install to this scale installation component (18) at this needle pivot guiding elements (21) can be when going up with the corresponding claw type of this needle pivot guiding elements (21) (21d) interior axial groove (18c) of engaging partly.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP76374/89 | 1989-06-30 | ||
| JP1989076374U JP2510346Y2 (en) | 1989-06-30 | 1989-06-30 | Eddy current instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1048454A true CN1048454A (en) | 1991-01-09 |
| CN1025243C CN1025243C (en) | 1994-06-29 |
Family
ID=13603571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN90103288A Expired - Lifetime CN1025243C (en) | 1989-06-30 | 1990-06-27 | Eddy current meter |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2510346Y2 (en) |
| KR (1) | KR930005366Y1 (en) |
| CN (1) | CN1025243C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107949774A (en) * | 2015-09-07 | 2018-04-20 | 日本精机株式会社 | Eddy current type instrument |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6039818Y2 (en) * | 1981-07-31 | 1985-11-29 | 日本精機株式会社 | eddy current instrument |
| JPS5832169A (en) * | 1981-08-20 | 1983-02-25 | Nippon Denso Co Ltd | Eddy current type instrument |
-
1989
- 1989-06-30 JP JP1989076374U patent/JP2510346Y2/en not_active Expired - Fee Related
-
1990
- 1990-06-27 CN CN90103288A patent/CN1025243C/en not_active Expired - Lifetime
- 1990-06-30 KR KR2019900009484U patent/KR930005366Y1/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107949774A (en) * | 2015-09-07 | 2018-04-20 | 日本精机株式会社 | Eddy current type instrument |
| CN107949774B (en) * | 2015-09-07 | 2020-08-14 | 日本精机株式会社 | Eddy current type instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1025243C (en) | 1994-06-29 |
| JPH0317572U (en) | 1991-02-21 |
| KR910001194U (en) | 1991-01-24 |
| JP2510346Y2 (en) | 1996-09-11 |
| KR930005366Y1 (en) | 1993-08-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| OR01 | Other related matters | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 19940629 |