JPH05107270A - Inverted cross coil type movement - Google Patents

Abstract

PURPOSE:To obtain an inverted cross coil type movement applicable for a virtual image display type instrument by preventing leakage of a damper liquid to allow the operation of a pointer shaft normally. CONSTITUTION:A circular protruded wall 232 surrounding the outer circumference of a pointer shaft 3 piercing a through hole 227 of the bottom part 221 of a bobbin 2 is so extended to protrude upward from the bottom 221 of the bobbin 2. A fitting groove 13 is formed on the underside of a permanent magnet 1 to fit the protruded wall 232 thereinto. Then, a silicon oil 7 for a damper of the pointer shaft 3 is fed within such a range as not to exceed the upper end face of the protruded wall 232 thereby preventing the silicon oil 7 from spilling out of the through hole 227.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverted cross coil movement which is installed upside down in a pad of an instrument panel.

[0002]

2. Description of the Related Art Conventionally, two coils intersecting each other are wound around an outer circumference of a bobbin, and a permanent magnet having a pointer shaft fixed thereto is rotatably arranged in the bobbin, thereby indicating a wide angle of the pointer. There is known a cross-coil type movement (such as Japanese Utility Model Laid-Open No. 60-173078) that enables the above.
Around the permanent magnet, silicone oil for a damper that slows the movement of the pointer is enclosed. Also, a virtual image display type instrument device in which a fluorescent display type display tube is incorporated in a pad of an instrument panel and the display light thereof is reflected by a half mirror to be visually recognized by a driver as a virtual image has been put into practical use.

[0003]

As described above, the fluorescent image display device is currently used for the virtual image display type instrument device, whereas the virtual image display type instrument device has a cross coil. It is conceivable that a movement of the instrument type will be used to create novelty.For this purpose, the cross-coil movement is inverted, that is, the pad of the instrument panel is placed so that the protruding direction of the pointer shaft from the bobbin is downward. Must be incorporated within. However, if the above-mentioned conventional cross coil type movement is used upside down, the silicone oil in the bobbin leaks to the outside of the bobbin through the through hole of the pointer shaft formed at the bottom of the bobbin, so that the damper action of the pointer is Will decrease. Therefore, there is a problem that the responsiveness of the pointer shaft to the change in the current flowing through the pair of crossing coils becomes fast and the pointer swings, so that the pointer shaft does not operate normally. SUMMARY OF THE INVENTION It is an object of the present invention to provide an inverted cross-coil movement in which damper liquid is prevented from leaking and the pointer shaft operates normally.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a pair of intersecting coils intersecting each other in a cross shape, a permanent magnet to which a composite magnetic field generated in these intersecting coils is applied, and the pair of coils are wound around the outer circumference. And a bobbin having a through hole at the bottom thereof, which is housed therein, and fixed to the permanent magnet, and is rotatably supported in the through hole with one end protruding from the bottom of the bobbin. And a damper liquid that slows the movement of the pointer shaft, and a protrusion that surrounds the outer periphery of the pointer shaft is provided at the bottom of the bobbin so as to project upward, and the damper liquid is The technical means is adopted that is enclosed only in the hollow portion surrounded by the outer circumference of the protrusion and the inner circumference of the bobbin.

[0005]

According to the present invention, since the damper liquid is enclosed only in the hollow portion surrounded by the projecting portion projecting upward from the bottom of the bobbin and the inner circumference of the bobbin, it is temporarily incorporated in the virtual image display type instrument device. Therefore, even if the inverted cross coil movement is installed upside down, the damper liquid does not leak to the outside of the bobbin through the through hole formed at the bottom of the bobbin. As a result, it is possible to prevent the damping action of the pointer shaft from being lowered, so that it is possible to prevent the responsiveness of the pointer shaft from becoming faster with respect to the change in the current flowing through the pair of cross coils.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an inverted cross coil type movement of the present invention will be described based on the embodiments shown in FIGS. 1 to 3 show a first embodiment of the present invention. Figure 1
2 and FIG. 2 are views showing an inverted cross-coil movement. The inverted type cross-coil movement A is shown in Fig. 3.
As shown in FIG. 5, it is used in a virtual image display type vehicle speedometer and is installed upside down in the pad 101 of the instrument panel 100. Reference numeral 102 denotes a conductive screw screw that fastens and fixes the inverted cross-coil movement A to the instrument panel 100 and sends a vehicle speed signal to the inverted cross-coil movement A. 103
Is a light-transmissive dial with a mirror image of a speed scale. Reference numeral 105 denotes a half mirror that changes the position of the virtual image display 104 by adjusting the mounting angle. 1
Reference numeral 09 denotes a conductive pattern formed on the back surface of the pad 101 and the resin members 107 and 108.
Electrically connected to 06.

The inverted cross-coil movement A has a disk-shaped permanent magnet 1 that permanently retains magnetism, a bobbin 2 that houses the permanent magnet 1, and a pointer shaft that is rotatably supported by the bobbin 2. 3 and a self-luminous pointer 4 which rotates integrally with the pointer shaft 3. Further, the inverted crossed coil type movement A includes the first coil 5 wound around the bobbin 2 and the bobbin 2 that crosses the first coil 5 in a cross shape.
Second coil 6 wound around the bobbin 2, high-viscosity silicone oil 7 enclosed in the bobbin 2, a magnetic shield case 8 covering the upper part of the bobbin 2, and a bearing plate 9 provided on the lower side of the bobbin 2. With.

The permanent magnet 1 is a flat high magnetic force two-pole magnet, and an annular bulging portion 11 surrounding the outer periphery of a protruding wall 232 of the bobbin 2 which will be described later bulges downward. Further, a shaft hole 12 through which the pointer shaft 3 penetrates is formed in the center of the permanent magnet 1, and the pointer shaft 3 is press-fitted and fixed. Further, a predetermined gap is formed between the outer circumference of the permanent magnet 1 and the inner circumference of the bobbin 2 so that the permanent magnet 1 can rotate in the bobbin 2. The bulging portion 1 of the permanent magnet 1
A cylindrical fitting groove 13 for avoiding the protruding wall 232 of the bobbin 2 is formed in the inside 1.

The bobbin 2 is made of plastic and has a circular shape, and is composed of an upper bobbin 21 and a lower bobbin 22, and the upper bobbin 21 and the lower bobbin 22 are fitted to each other to form a circular hollow portion inside. 23 is formed. The upper bobbin 21 has a ceiling portion 212 having a bearing portion 211 formed at the center,
It has a cylindrical side wall portion 213 extending below the outer peripheral edge of the ceiling portion 212, and four mounting leg portions 214 provided on the outer periphery of the side wall portion 213 at predetermined intervals. A steel ball 215 for reducing bearing friction of the upper end portion 32 of the pointer shaft 3 is fitted into the bearing portion 211.
In the part surrounded by the ceiling part 212 and the mounting leg part 214,
The first coil 5 and the second coil 6 are wound so as to cross each other in a cross shape. Also, the four mounting legs 214 are
The outer shape is formed into a substantially triangular tube shape, and has a substantially circular screw hole 216 that is screwed into the screw screw 102 inside. The lower bobbin 22 has an annular bottom portion 221 that rotatably supports the central portion of the pointer shaft 3, a cylindrical upper side wall portion 222 extending upward from the outer peripheral edge of the bottom portion 221, and a bottom portion 221. A cylindrical lower side wall portion 223 extending downward from the outer peripheral edge, and four mounting leg portions 214 formed on the upper bobbin 21 and provided on the outer periphery of the lower side wall portion 223 at a predetermined interval. Are integrally formed with four mounting leg portions 224. The outer shape of each of the four mounting legs 224 is formed into a substantially triangular tube shape, and has a substantially triangular tube-shaped insertion hole 225 into which terminals 51, 52, 61, and 62 to be described later are inserted. The first coil 5 and the second coil 6 are wound so as to cross each other in a cross shape in a portion surrounded by the lower end surface of the bottom portion 221 and the inner side surface of the mounting leg portion 224.

A boss portion 226 is formed at the center of the bottom portion 221 so as to project downward. Inside the boss portion 226, the pointer shaft 3 is rotatably pierced. A circular through hole 227 having a predetermined gap is formed between the inner circumference and the outer circumference of the pointer shaft 3. Upper wall 2
22 is formed on the inner peripheral side of the lower side wall portion 223 by an amount approximately equal to the plate thickness of the side wall portion 213 of the upper bobbin 21. The upper side wall 222 is fitted to the inner circumference of the side wall 213 of the upper bobbin 21. Mounting plates 228 extend outward from the outer facing portions of the lower side wall portion 223 and the outer peripheral surfaces of the two mounting leg portions 224, respectively. Cylindrical mounting legs 229 for fastening and fixing the dial 103 and the like project upward from these mounting plates 228, and fasteners (not shown) are provided on the outside of these mounting legs 229. A circular insertion hole 230 through which is inserted is formed. The two mounting leg portions 229 are formed in a cylindrical shape, and have a substantially circular screw hole 231 into which a fastener (not shown) is screwed.
Have.

An annular projecting wall 232 that surrounds the outer circumference of the pointer shaft 3 is extended from the upper end surface of the bottom portion 221 so as to project upward. The protruding wall 232
Is a protrusion of the present invention and is fitted into the fitting groove 13 formed in the permanent magnet 1. In addition, the protruding wall 232
A cylindrical oil reservoir 233, in which the silicone oil 7 is enclosed, is formed between the outer circumference and the inner circumference of the upper side wall 222. The oil sump 233 is a hollow portion of the present invention, and the bulging portion 11 of the permanent magnet 1 is fitted therein. Mounting plates 234 extend outward from the outer peripheral surfaces of the other two mounting legs 224. Positioning pins 235 and 236 for positioning the bearing plate 9 project downward from the lower end surfaces of the mounting plates 234.

The pointer shaft 3 is held in the permanent magnet 1 while penetrating the shaft hole 12 of the permanent magnet 1. Further, the portion of the pointer shaft 3 protruding from the lower end surface of the permanent magnet 1 is
The shaft is fixed by the bearing plate 9, and the through hole 22
The lower bobbin 22 is rotatably supported by the bottom portion 221 of the lower bobbin 22 while penetrating through 7. Further, a self-luminous pointer 4 is fixed to a lower end portion 31 of the pointer shaft 3 that projects from the lower end surface of the dial 103. The upper end portion 32 of the pointer shaft 3 protruding from the upper end surface of the permanent magnet 1 has the bearing portion 2
It is axially fixed to 11 and is rotatably supported by the upper bobbin 21. The self-luminous pointer 4 is press-fitted and fixed to the lower end portion 31 of the pointer shaft 3 below the dial 103, and rotates integrally with the permanent magnet 1 and the pointer shaft 3. The self-luminous indicator 4 is arranged along the axial direction on a bulb (not shown) having an elongated hollow rod shape, an internal electrode (not shown) provided at an end of the bulb, and an outer surface of the bulb. And a strip-shaped external electrode (not shown).

The first coil 5 and the second coil 6 are a pair of intersecting coils according to the present invention, and the combined magnetic field is a permanent magnet 1.
Is attached to the outer peripheral surface of the upper bobbin 21, the upper end surface of the upper bobbin 21, and the outer peripheral surface of the lower bobbin 22, and the lower end surface of the lower bobbin 22 so as to intersect at 90 °. Both winding ends of the first coil 5 and both winding ends of the second coil 6 have terminals 51, 52 planted in the insertion holes 225 of the mounting legs 224 formed on the lower bobbin 22. , 6
1 and 62 are electrically connected respectively. The terminals 51, 52, 61 and 62 are supplied with power from the vehicle speed sensor by using a waveform shaping circuit, a zero-return circuit, an F / V conversion circuit, a comparison circuit, a frequency divider circuit, a sin generator, a cos generator, and This is performed via a screw screw 102 after conversion processing into a sin current and a cos current by a known drive device (not shown) including a ripple generation circuit. Silicon oil 7 is the damper liquid of the present invention,
It has a damper action that brakes the bulging portion 11 of the permanent magnet 1 to slow the movement of the self-luminous indicator 4 and weakens the vibration of the vehicle. This silicone oil 7 is an annular ring formed on the bottom portion 221 of the lower bobbin 22 even when it is vibrated when the inverted cross coil movement A is installed upside down in the pad 101 of the instrument panel 100. The oil is contained in the oil reservoir 233 so as to surround the bulging portion 11 of the permanent magnet 1 within a range not exceeding the upper end surface of the protruding wall 232.

The magnetic shield case 8 has an upper bobbin 21.
And a disc-shaped ceiling part 81 disposed between the instrument panel 100 and the instrument panel 100, and an outer periphery of the upper bobbin 21 and the lower bobbin 22 that extend below the outer peripheral edge of the ceiling part 81.
And a cylindrical side wall portion 82 which is press-fitted to the outer periphery of the. Four insertion holes 83 for the screw screws 102 are formed in the ceiling portion 81, and a circular hole 84 for avoiding interference with the bearing portion 211 formed on the upper bobbin 21 and a circular hole for keeping the magnetic attraction force constant. A hole 85 is formed. The insertion hole 83 is formed by the screw holes 216 of the four mounting leg portions 214 formed on the upper bobbin 21 and the insertion holes 22 of the four mounting leg portions 224 formed on the lower bobbin 22.
It is formed at a position corresponding to 5. In addition, the side wall portion 82
A crimping piece 86 for crimping and fixing the bobbin 2 and the bearing plate 9 extends from a position where the lower end of the bobbin faces each other. The bearing plate 9 is formed in a substantially Z shape, and has at both ends thereof insertion holes 91 and 92 through which the positioning pins 235 and 236 of the lower bobbin 22 are inserted. A fitting hole 94 into which a cylindrical bearing fitting 93 is fitted is formed in the center of the bearing plate 9, and the bearing fitting 93 is caulked and fixed. The pointer shaft 3 is axially fixed in the bearing hole 95 of the bearing fitting 93 in a penetrating state.

Next, a method of assembling the virtual image display type speedometer will be briefly described with reference to FIGS. 1 to 3. After the pointer shaft 3 is fixed in the shaft hole 12 of the permanent magnet 1 in a penetrating state, the upper end portion 32 of the pointer shaft 3 is inserted into the bearing portion 211 containing the steel ball 215 to stop the shaft. On the other hand, after injecting an appropriate amount of silicone oil 7 into the oil sump 233 of the lower bobbin 22, the lower bobbin 2 from the lower end 31 side of the pointer shaft 3 is injected.
2 is inserted and the pointer shaft 3 is fitted into the through hole 227.
Then, the upper bobbin 21 and the lower bobbin 22 are housed so as to house the permanent magnet 1 and the pointer shaft 3, and the upper side wall part 222 is press-fitted to the inner periphery of the side wall part 213, whereby the permanent magnet 1 and the bobbin 2 are inserted. And attach the pointer shaft 3. At this time,
The fitting groove 13 of the permanent magnet 1 and the protruding wall 23 of the lower bobbin 22
2 allows the lower end surface of the permanent magnet 1 and the upper end surface of the bottom portion 221 of the lower bobbin 22 to be assembled without contact. Further, the bulging portion 11 of the permanent magnet 1 is fitted into the oil reservoir 233, and the silicone oil 7 wraps around the bulging portion 11 so as not to exceed the upper end surface of the protruding wall 232. Silicone oil 7 will fit.

Next, the first coil 5 and the second coil 6
It is wound around the bobbin 2 so that and intersect at 90 °, and these winding ends are electrically connected to the terminals 51, 52, 61, 62 inserted into the mounting leg 224. Then, the bearing fitting 93 is caulked and fixed in the fitting hole 94 of the bearing plate 9, and the pointer shaft 3 protruding from the lower end surface of the lower bobbin 22 is penetrated into the bearing hole 95 of the bearing fitting 93. Fit together. Next, the insertion hole 91 of the bearing plate 9,
92 is fitted to the positioning pins 235 and 236 of the lower bobbin 22, and the bearing plate 9 is positioned by the positioning pins 235 and 236. And the upper bobbin 21
After the magnetic shield case 8 is fitted to the bobbin 2 so as to cover the mounting legs 214 and 224 from the ceiling part 212 side, the crimping pieces 86 of the magnetic shield case 8 are bent to attach the both ends of the bearing plate 9 to the bobbin respectively. The bobbin 2 and the bearing plate 9 are fixed by pressing them to the 2 side. In this way, inverted type cross-coil movement A
Is assembled.

Then, the inverted cross coil movement A is housed in a pad 101 of an instrument panel 100 provided in the front of the vehicle compartment, and four screw screws 102 are fastened to a mounting leg portion 214 to thereby stand upside down. The die-intersection coil type movement A is attached to the instrument panel 100 with the lower end 31 of the pointer shaft 3 facing downward. Then, after inserting the light transmissive dial 103 on which a speed scale or the like is mirror-image printed on the pad 101, the self-luminous pointer 4 is press-fitted and fixed to the lower end portion 31 of the pointer shaft 3 protruding downward from the dial 103. By
The inverted type cross coil movement A is mounted on the vehicle. The first coil 5 and the second coil 6 of the inverted cross-coil movement A assembled in this manner are supplied with sin current and cos current, respectively. The permanent magnet 1 rotates so that the directions of the north and south poles of the permanent magnet 1 coincide with the direction of the synthetic magnetic field generated by the coil 6. Therefore, the self-emission indicator 4 that rotates integrally with the permanent magnet 1 provides a display corresponding to the signal from the vehicle speed sensor.

As described above, if the inverted cross coil movement A is installed upside down in the pad 101 of the instrument panel 100 so that the self-luminous pointer 4 is arranged on the lower side, Even if it receives vibration, use the silicone oil 7 for the damper of the self-luminous pointer 4 on the lower bobbin 2
It is possible to prevent the silicone oil 7 from leaking from the through hole 227 of the lower bobbin 22 to the dial 103 side by blocking it with the two protruding walls 232. As a result, it is possible to prevent the damper action of the self-luminous indicator 4 from being lowered, so that si flowing to the first coil 5 and the second coil 6
It is possible to prevent the responsiveness of the self-luminous indicator 4 from becoming faster with respect to changes in the n-current and the cos current. Therefore, the sin current or the co current flowing through the permanent magnet 1, the pointer shaft 3, and the self-luminous pointer 4 in the first coil 5 and the second coil 6 is reduced.
It is possible to operate normally with respect to changes in the s current.
Furthermore, since there is no possibility of contaminating the dial 103 with the silicone oil 7, the inverted cross coil movement A
Can be used for a virtual image display type speedometer. Further, in this embodiment, when the driver confirms the vehicle speed, the virtual image is displayed so that the focus can be easily focused, the vehicle speed can be grasped quickly, and the analog display using the self-luminous indicator 4 is used to adjust the vehicle speed. Is easy to do. The screw 102 facilitates mounting on the pad 101, and the conductive pattern 109 prevents the number of wiring wires from increasing.

FIG. 4 and FIG. 5 show the second embodiment of the present invention and are views showing an inverted cross coil type movement. In this embodiment, a circular fitting groove 14 is formed on the lower end surface of the permanent magnet 1, and a disc-shaped projecting portion 237 is formed on the bottom portion 221 of the lower bobbin 22. Then, the silicone oil 7 is enclosed in the oil reservoir 233 so as not to exceed the upper end surface of the protrusion 237, so that the same effect as that of the first embodiment is provided.

[Modification] In this embodiment, silicon oil is used as the damper liquid, but other liquid such as magnetic fluid may be used. In this embodiment, the sin current and the cos current are passed through the first coil 5 and the second coil 6, but other signals except the sin current and the cos current are passed through the first coil 5 and the second coil 6, For example, a voltage signal or the like may be sent. If the drive circuit is changed to that for an engine tachometer and the ignition signal of the igniter is input to the drive circuit instead of the signal of the vehicle speed sensor, the engine speed can be displayed as a virtual image. Further, the present invention may be applied to a virtual image display type instrument device such as a fuel fuel gauge and a water temperature gauge. The inverted crossed coil movement may or may not be a needle placement type.

In this embodiment, the protruding wall (projecting portion) 232,
Although the protruding portion 237 is formed in an annular shape or a disk shape, the protruding portion may be formed in an angular ring shape, a disk shape, a fan shape, or an arc shape. In this case, the shape of the fitting groove 13 of the permanent magnet 1 may be changed according to the protruding portion. Further, the shape of the oil reservoir (hollow portion) 233 may be freely changed to a rectangular tube shape, an arc shape, or the like as long as the silicone oil (damper liquid) does not leak from the through hole 227. In the present embodiment, the damper action of the silicone oil 7 is applied to the bulging portion 11 of the permanent magnet 1. However, the permanent magnet 1 or the pointer shaft 3 is provided with a protrusion that fits in the oil reservoir 233 and the damper of the silicone oil 7 is provided. The action may be given to the pointer shaft 3.

[0022]

According to the present invention, even if the inverted cross coil movement is inverted for use in the virtual image display type instrument device, the damper liquid does not leak from the bobbin through the through hole. .. As a result, it is possible to prevent the damper action of the pointer shaft from being lowered, so that the pointer shaft can be operated normally. Therefore, the inverted cross coil movement can be used for the virtual image display type instrument device.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an inverted cross coil type movement applied to a first embodiment of the present invention.

FIG. 2 is a bottom view showing an inverted cross coil type movement applied to the first embodiment of the present invention.

FIG. 3 is a sectional view showing a virtual image display type speedometer applied to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view showing an inverted cross coil type movement applied to a second embodiment of the present invention.

FIG. 5 is an exploded perspective view showing an inverted cross coil type movement applied to a second embodiment of the present invention.

[Explanation of symbols]

 A Inverted cross-coil movement 1 Permanent magnet 2 Bobbin 3 Pointer shaft 4 Self-luminous pointer 5 First coil (cross coil) 6 Second coil (cross coil) 7 Silicon oil (damper liquid) 13 Fitting groove 221 Bottom part 227 Through hole 232 Projecting wall (projecting part) 233 Oil reservoir (hollow part)

Claims (1)

[Claims] 1. A pair of crossing coils crossing each other in a cross shape, a permanent magnet to which a synthetic magnetic field generated in these crossing coils is applied, and a pair of coils wound around the outer periphery of the permanent magnet. A bobbin that is housed and has a through hole at the bottom, and a pointer shaft that is fixed to the permanent magnet and is rotatably supported in the through hole with one end protruding from the bottom of the bobbin. And a damper liquid that slows down the movement of the bobbin, a protrusion that surrounds the outer circumference of the pointer shaft is provided so as to protrude upward at the bottom of the bobbin, and the damper liquid is the outer circumference of the protrusion and the An inverted cross-coil movement that is enclosed only in the hollow part surrounded by the inner circumference of the bobbin.