JP3542052B2 - Pointer display - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pointer type display device configured to rotate a disk-shaped magnet rotor (rotor) with a cross coil (biasing means), such as a cross coil type pointer type display device, and particularly to a magnet rotor. The present invention relates to a so-called multi-axis pointer type display device configured to rotate the pointer by transmitting the rotation of the rotor shaft to a drive shaft to which the pointer is attached.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a current that varies according to a display amount is applied to a pair of coils (hereinafter, referred to as “cross coils”) wound in directions orthogonal to each other, thereby causing a magnet rotor to move in the direction of a combined magnetic field generated by the cross coils. 2. Description of the Related Art There is known a pointer type display device which is configured to be driven to rotate and display information by a pointer which rotates together with the magnet rotor.
[0003]
Such a pointer-type display device includes a so-called combination meter integrally provided with various meters, gauges, and the like, the position of the pointer, the layout (design) of the inner unit (drive mechanism), and the small size thereof. The drive shaft to which the above-described hands are attached is offset from the rotor shaft of the magnet rotor and separately provided for the purpose of achieving the balance and for the purpose of, for example, adjusting the balance between the drive torque and the movement amount of the hands. A multi-axis pointer-type display device (multi-axis display device) is provided.
[0004]
Hereinafter, the multi-axis display device will be described with reference to the drawings. FIG. 4A is a cross-sectional view illustrating a configuration of a conventional multi-axis display device. In the figure, reference numeral 1 denotes a pointer, and 2 denotes a movement for applying a rotational driving force to the pointer.
The pointer portion 1 is roughly composed of a pointer 11, a drive shaft 12, a drive gear 13, and a return-to-zero mechanism 14. The movement 2 includes a coil bobbin 21, a magnet rotor 22, a rotor shaft 23, an output gear 24, a cross coil 25, and a shield case 26. It is roughly constituted from.
[0005]
The pointer 11 includes a wedge-shaped pointer main body 111 having a tapered tip, a base end portion of the pointer main body 111 provided at the base end of the pointer main body 111, and a pointer hammer 113 described later. The pointer cap 112 that covers and hides from the upper side, the pointer hakama 113 erected from the base end of the pointer body 111 to the rear, and the weight balance of the pointer 11 are adjusted, and the center of gravity of the pointer 11 And a balance adjustment unit 114 that is set upright.
The pointer hakama 113 constitutes an attachment portion to the drive shaft 12 and serves as a rotation center of the pointer 11.
[0006]
The front end of the drive shaft 12 is fitted to the above-described pointer hammer 113 to support the pointer 11. A thrust bearing member 121 is buried at the rear end (lower side in the figure) of the drive shaft 12, and an upper bearing member 122 is provided at a predetermined position on the front end side of the drive shaft 12 so that the drive shaft 12 can rotate. I support it.
Then, the drive shaft 12 is rotated by transmitting the rotational force from the movement 2 and positions the hands 11 at the designated position according to the display amount.
[0007]
The drive gear 13 is configured as a disc-shaped gear, is fixed to the drive shaft 12 at a position near the front end of the drive shaft 12 and near the rear of the pointer 11, and rotates with the drive shaft 12.
The return-to-zero mechanism 14 is a mechanism that applies a biasing force in the return-to-zero direction to the drive shaft 12 when the pointer 11 is moved in the base (zero) direction. The return to zero mechanism 14 includes a balance spring 141 and a balance ball 142. Is disposed between the upper bearing 122 and the drive gear 13.
[0008]
The coil bobbin 21 constituting the movement 2 includes an upper coil bobbin 211 and a lower coil bobbin 212. An internal space 21a for accommodating the magnet rotor 22 is formed in a portion where the upper coil bobbin 211 and the lower coil bobbin 212 are in contact.
A bearing hole 21c extending in the front-rear direction (vertical direction in the figure) is formed on one side of the coil bobbin 21, and the drive shaft 12, the thrust bearing member 121, and the upper bearing member 122 are formed in the bearing hole 21c. Are arranged.
[0009]
The magnet rotor 22 is configured as a disk-shaped magnet, and has N and S poles magnetized at radially symmetric positions.
Further, a rotor shaft 23 is fixed to a center position of the magnet rotor 22. The rotor shaft 23 passes through the magnet rotor 22, and its rear end is supported by a bearing recess 21 b provided in the lower coil bobbin 212, and its front end is supported so as to protrude to the outside of the coil bobbin 21.
[0010]
In this support state, the rotor shaft 23 is rotatable with respect to the coil bobbin 21.
An output gear 24 is fixed to the front end of the rotor shaft 23. That is, the front end of the rotor shaft 23 is disposed at a substantially central position of the output gear 24 and penetrates the output gear 24.
In this arrangement state, the output gear 24 meshes with the drive gear 13 provided on the drive shaft 12, and the output gear 24 and the drive gear 13 transmit rotation between the rotor shaft 23 and the drive shaft 12. It has a configuration.
[0011]
A first coil 251 and a second coil 252 are wound on the above-described coil bobbin 21 at right angles to each other, and these coils 251 and 252 constitute a cross coil 25.
The cross coil 25 generates a magnetic field having a different direction according to the intensity of the current supplied to the first coil 251 and the second coil 252. The magnetic field generated by the cross coil 25 acts on the magnet rotor 22 to rotate the magnet rotor 22 to an angular position corresponding to the magnetic field.
The shield case 26 blocks a magnetic field generated from the display device or a magnetic field acting on the display device from the outside. The shield case 26 is provided around the coil bobbin 21 so as to include the coil bobbin 21.
[0012]
In the above-described configuration, as shown in FIG. 4B, a current corresponding to the display amount is supplied to the first coil 251 and the second coil 252 constituting the cross coil 25, and generated from the cross coil 25. The magnetic field φ is changed. For example, by changing the current supplied to the first coil 251 and the second coil 252, the magnetic field φ1 in the direction indicated by the dotted arrow in the drawing is changed to the magnetic field φ2 in the direction indicated by the solid arrow.
By applying such magnetic fields φ1 and φ2 to the magnet rotor 22, the magnet rotor 22 rotates following the magnetic fields φ1 and φ2. Thereby, the output gear 24 rotates with the rotation of the magnet rotor 22.
The rotation of the output gear 24 is transmitted to the drive shaft 12 by the drive gear 13 arranged in a state of meshing with the output gear 24. The rotation of the drive shaft 12 causes the pointer 11 attached to the front end of the drive shaft 12 to rotate.
[0013]
[Problems to be solved by the invention]
In the conventional multi-axis display device, as described above, rotation transmission between the drive shaft 12 to which the pointer 11 is attached and the rotor shaft 23 to which the magnet rotor 22 is attached is performed by a dedicated rotation transmission means, that is, the drive gear 13 and The configuration is such that the output gear 24 is used.
[0014]
As described above, when the apparatus is configured to include the dedicated rotation transmitting means (the drive gear 13 and the output gear 24), there is a disadvantage that the number of parts increases and the cost of the apparatus increases.
The present invention has been made in view of the above points, and has as its object to provide an inexpensive device by reducing the number of components constituting the device.
[0015]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a pointer-type display device according to the present invention, as shown in FIGS. 1 and 2, is driven to rotate by an urging force (φ) from an urging means (25) in accordance with a display amount. A rotor (22), which is a disk-shaped magnet rotor, and a first drive shaft (23) that rotates with the rotor (22), and a pointer (11) for indicating the display amount. 2 drive shaft (12), and is disposed between the first drive shaft (23) and the second drive shaft (12), and the rotational force from the first drive shaft (23) is A pointer transmission device for transmitting the rotation to the second drive shaft (12), wherein the pointer (11) is positioned at a designated position according to the display amount; (22) At least a portion corresponding to the rotatable range of the peripheral surface The second drive shaft (12) is configured as a first contact transmission surface (22a), and the second drive shaft (12) has at least a second contact transmission surface (151) configured as an arc-shaped peripheral surface corresponding to the rotatable range thereof. A transmission member (15) having a first contact transmission surface (22a) of the rotor (22) and a second contact transmission surface (151) of the transmission member (15) so as to contact each other. It is characterized in that the rotation transmitting means is configured by disposing.
[0016]
Further , the biasing means is a cross coil (25) wound in a direction orthogonal to each other.
[0017]
Further, the first contact transmitting surface (22a) provided on the rotor (22) and the second contact transmitting surface (151) provided on the transmitting member (15) are configured as gear surfaces. The rotation force from the first drive shaft (23) is transmitted to the second drive shaft (12) by engaging both contact transmission surfaces (22a, 151).
[0018]
In the above configuration, the rotor, for example, the magnet rotor (22) disposed on the first drive shaft (23) is driven to rotate in accordance with the urging force, for example, the magnetic field (φ) from the urging means, for example, the cross coil (25). I do. A first contact transmitting surface (22a) is formed on a peripheral surface of the rotor (22).
In addition, a second contact transmission surface (151) is formed on a peripheral surface of a gear member (151) as a transmission member (15) on the second drive shaft (12) to which the hands 11 are attached. .
The first contact transmitting surface (22a) and the second contact transmitting surface (151) are disposed so as to be in contact with each other, and rotate the rotor (22), that is, the first drive shaft (23). Is transmitted to the second drive shaft (12) via the first and second contact transmission surfaces (22a and 151).
[0019]
That is, a first contact transmission surface is formed on the peripheral surface of the rotor (22) that is driven to rotate in accordance with the urging force (φ) from the urging means (25), and is formed via the first contact transmission surface. Since the rotation force of the first drive shaft (23) is configured to be transmitted to the second drive shaft (12), the number of components required for rotation transmission on the rotor (22) side can be reduced, and the apparatus can be reduced. It can be configured at low cost.
[0020]
Further, the first and second contact transmitting surfaces (22a and 151) are configured as gear surfaces, and the rotational force of the first drive shaft (23) is reduced by engaging the two contact transmitting surfaces (22a and 151). Since the transmission is transmitted to the second drive shaft (12), the rotation can be transmitted reliably.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, specific examples of the embodiments of the present invention will be described with reference to the drawings. 1 to 3 show an embodiment of the present invention. FIGS. 1 and 2 show a first specific example, and FIG. 3 shows a second specific example.
[0022]
First, a first specific example will be described with reference to FIGS.
This first specific example is schematically composed of a pointer 1 and a movement 2. The pointer portion 1 is roughly composed of a pointer 11, a drive shaft 12, a return-to-zero mechanism 14, and a gear member 15A, and the movement 2 includes a coil bobbin 21, a magnet rotor 22, a rotor shaft 23, an output gear 24, a cross coil 25, and a shield case 26. It is roughly constituted from.
[0023]
The pointer 11, the drive shaft 12, and the return-to-zero mechanism 14, among the components constituting the pointer 1, have the same configuration as the above-described conventional device.
That is, the pointer 11 is a wedge-shaped pointer main body 111, a pointer cap 112 that covers the base end portion of the pointer main body 111 and the pointer hakama 113, and is erected rearward from the base end of the pointer main body 111. It has a pointer hakama 113 constituting a mounting portion for the drive shaft 12 and a balance adjusting section 114 for adjusting the weight balance of the pointer 11.
[0024]
The drive shaft 12 is formed of a non-magnetic metal material, supports the pointer 11 at its front end, and is disposed at a predetermined position on the front end side of the thrust bearing member 121 disposed at the rear end. It is rotatably supported by the upper bearing member 122.
The return-to-zero mechanism 14 includes a balance spring 141 and a balance ball 142, and is disposed between the upper bearing 122 and the drive gear 13. When the pointer 11 is returned to the zero point, a biasing force is applied to the drive shaft 12 in the return direction.
[0025]
The gear member 15A is provided in place of the drive gear 13 in the conventional device, and is disposed at a substantially intermediate position in the front-rear direction of the drive shaft 12 so as to be included in the coil bobbin 21.
The gear member 15A is formed as a member formed of resin and having a substantially fan-shaped three-dimensional shape (described later) in a front view. A gear is formed on the circular arc peripheral surface of the gear member 15A, and forms a gear surface 151.
[0026]
Each part constituting the movement 2 has substantially the same configuration as that of the conventional device, and includes a coil bobbin 21, a magnet rotor 22, a rotor shaft 23, an output gear 24, a cross coil 25, and a shield case 26. I have.
[0027]
That is, the coil bobbin 21 includes an upper coil bobbin 211 and a lower coil bobbin 212. Inside the bobbins 211 and 212, an internal space 21a for accommodating the magnet rotor 22 and a bearing recess 21b for supporting the rear end of the rotor shaft 23 are provided. A bearing hole 21c for accommodating the drive shaft 12 and a gear accommodating space 21d for accommodating the gear member 15A are formed.
[0028]
The magnet rotor 22 is configured as a disk-shaped magnet with N and S poles magnetized at radially symmetric positions, and is formed of, for example, a plastic magnet. A gear surface 22a is formed on a part of the peripheral surface of the magnet rotor 22, more specifically, on a part corresponding to the rotatable range of the pointer 11.
The gear surface 22a is formed as a surface that meshes with the gear surface 151 formed on the circular arc surface of the gear member 15A.
[0029]
Further, a rotor shaft 23 is fixed to a center position of the magnet rotor 22 in a state where the rotor shaft 23 penetrates. The length of the rotor shaft 23 is shorter than that of the conventional device described above, and the front end thereof is housed in the coil bobbin 21.
In this support state, the rotor shaft 23 is rotatable with respect to the coil bobbin 21.
[0030]
The cross coil 25 includes a first coil 251 and a second coil 252, and is wound around the coil bobbin 21 so as to be orthogonal to each other. The cross coil 25 generates a magnetic field having a different direction according to the strength of the current supplied to the first coil 251 and the second coil 252, and the generated magnetic field acts on the magnet rotor 22.
The shield case 26 is provided on the outer periphery of the coil bobbin 21 so as to include the coil bobbin 21 and shields a magnetic field generated from the display device or a magnetic field acting on the display device from the outside.
[0031]
The first embodiment differs from the conventional device in the gear member 15A provided on the pointer 1 and the magnet rotor 22 constituting the movement 2. Hereinafter, this difference will be described.
[0032]
2A and 2B are diagrams showing a configuration of a main part in the first specific example. FIG. 2A is a perspective view showing a configuration of the main part, and FIG. is there. In these figures, the same parts as those described above are denoted by the same reference numerals.
[0033]
As described above, the magnet rotor 22 is fixed to the rotor shaft 23 passing through the center thereof, and the rotor shaft 23 is rotatably supported in the coil bobbin 21. Therefore, the magnet rotor 22 is also rotatably supported in the coil bobbin 21.
A gear surface 22a is formed on a part of the peripheral surface of the magnet rotor 22. The gear surface 22a is formed in an angle range corresponding to the rotatable range of the pointer 11, as described above.
[0034]
The gear surface 22a meshes with the gear surface 151 of the gear member 15A, and the drive shaft 12 is fixed to the base end of the gear member 15A symmetrically with the gear surface 151 in a penetrating state. The pointer 11 is attached to the tip of the drive shaft 12.
Therefore, in this configuration, as shown in FIG. 2B, a magnetic field from the cross coil 25, for example, a magnetic field in the directions indicated by the arrows φ1 and φ2 acts on the magnet rotor 22, so that the magnet rotor 22 It rotates following the magnetic fields φ1 and φ2.
[0035]
The rotation of the magnet rotor 22 is transmitted to the drive shaft 12 via a gear surface 22a formed on the peripheral surface of the magnet rotor 22 and a gear surface 151 formed on the peripheral surface of the gear member 15A. The pointer 11 rotates to an angular position corresponding to the display amount by the rotation of.
[0036]
In addition, regarding the formation range of the gear surface 22a and the gear surface 151 described above, in more detail, one rotation limit position P1 of the pointer 11 indicated by a dotted line in FIG. It is defined according to P2. The range of formation of the gear surface 22a and the gear surface 151 may be such that the gear surface 22a is formed over the entire circumference of the magnet rotor 22, and the gear member 15A is a disk-shaped member and the gear surface 151 is It may be formed over the entire circumference.
[0037]
As described above, the gear surface 22a is formed on the peripheral surface of the magnet rotor 22 that is driven to rotate in accordance with the magnetic fields φ1 and φ2 from the cross coil 25, and the drive shaft 12 is provided with the gear member 15A as the rotation transmitting member. Since the rotation of the rotor shaft 23 is transmitted to the drive shaft 12 via the gear surface 22a of the rotor 22 and the gear surface 151 of the gear member 15A, the number of parts required for the rotation transmission on the magnet rotor 22 side can be reduced. Thus, the apparatus can be configured at low cost.
[0038]
Further, since the gear surface 22a of the magnet rotor 22 and the gear surface 151 of the gear member 15A are meshed with each other to transmit the rotation, the rotation can be transmitted reliably.
[0039]
Next, a second specific example will be described with reference to FIG. 3A and 3B are diagrams showing a configuration of a main part in the second specific example, in which FIG. 3A is a perspective view showing the configuration of the main part, and FIG. is there. In these figures, the same parts as those described above are denoted by the same reference numerals.
In the second specific example, the other configuration (not shown) is the same as that of the first specific example described above, and a description thereof will be omitted.
[0040]
In the second specific example, the magnet rotor 22 is configured as a disk-shaped ferrite magnet. A ring-shaped rubber member 221 is provided on the entire peripheral surface of the magnet rotor 22. The rubber member 221 is a member whose surface is a high friction surface, and is configured as a member separate from the magnet rotor 22. The rubber member 221 is wound around the magnet rotor 22.
Further, a rotor shaft 23 is provided on the magnet rotor 22 so as to pass through the center thereof and be fixed thereto.
[0041]
On the other hand, in the second specific example, a rotor member 15B is attached to the drive shaft 12. The rotor member 15B corresponds to the gear member 15A in the above-described first specific example, and is disposed at a substantially intermediate position in the front-rear direction of the drive shaft 12 so as to be included in the coil bobbin 21.
A ring-shaped rubber member 152 is provided on the entire peripheral surface of the rotor member 15B. The rubber member 152 has a high friction surface on the surface similarly to the rubber member 221 described above, and is disposed in a state of being wound around the peripheral surface of the rotor member 15B.
[0042]
The magnet rotor 22 and the rotor member 15B are disposed such that their circumferential surfaces, that is, high friction surfaces, are in contact with each other.
Therefore, in this configuration, as shown in FIG. 3B, the magnetic fields φ1 and φ2 from the cross coil 25 act on the magnet rotor 22, so that the magnet rotor 22 is rotated. The power is transmitted to the rotor member 15B via the high friction surface (rubber member 221 rubber member 152).
Then, as the rotor member 15B rotates, the pointer 11 rotates to an angular position corresponding to the display amount.
[0043]
As described above, in the second specific example, the rotation transmission between the drive shaft 12 and the rotor shaft 23 is provided on the rubber member 221 provided on the circumferential surface of the magnet rotor 22 and on the circumferential surface of the rotor member 15B. The rubber member 152 is used.
Thus, a high friction member can be applied as the rotation transmitting means.
[0044]
【The invention's effect】
As described above, the present invention has the following effects.
That is, a first contact transmitting surface is formed on the peripheral surface of the rotor that is driven to rotate in accordance with the urging force from the urging means, and the rotational force of the first drive shaft is transmitted through the first contact transmitting surface. Since the transmission is performed to the second drive shaft, the number of components required for the rotation transmission on the rotor side can be reduced, and the apparatus can be configured at low cost.
[0045]
Also, since the first and second contact transmission surfaces are configured as gear surfaces, and the two contact transmission surfaces are engaged with each other, the rotational force of the first drive shaft is transmitted to the second drive shaft. The rotation can be transmitted reliably.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a configuration of a first specific example.
FIG. 2 is a diagram illustrating a main configuration in a first specific example.
FIG. 3 is a diagram illustrating a configuration of a main part in a second specific example.
FIG. 4 is a diagram illustrating the configuration of a conventional device.
[Explanation of symbols]
1 pointer 11 pointer 12 drive shaft 15A gear member 151 gear surface 15B rotor member 152 rubber member 2 movement 21 coil bobbin 21a internal space 21d gear housing space 22 magnet rotor 22a gear surface 221 rubber member 23 rotor shaft 25 cross coil

Claims (3)

A rotor, which is a disk-shaped magnet rotor that is driven to rotate in accordance with the amount of display by the urging force from the urging means, is provided with a first drive shaft that rotates with the rotor and a pointer that indicates the amount of display. A second drive shaft provided between the first drive shaft and the second drive shaft and configured to transmit a rotational force from the first drive shaft to the second drive shaft. A pointer-type display device having a transmission means and configured to position the pointer at a designated position according to the display amount,
At least a portion corresponding to a rotatable range of the peripheral surface of the rotor is configured as a first contact transmission surface,
The second drive shaft is provided with a transmission member having a second contact transmission surface configured as a circular arc peripheral surface corresponding to at least a rotatable range thereof,
The pointer-type display device, wherein the rotation transmission means is configured by arranging a first contact transmission surface of the rotor and a second contact transmission surface of the transmission member so as to contact each other. . The pointer-type display device according to claim 1, wherein the biasing means is a cross coil wound in a direction orthogonal to each other. A first contact transmission surface provided on the rotor and a second contact transmission surface provided on the transmission member are configured as gear surfaces, and the first drive is performed by meshing both contact transmission surfaces. 3. The pointer-type display device according to claim 1, wherein a rotational force from a shaft is transmitted to the second drive shaft.

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