JP2527301Y2 - Rotation detection device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation detecting device, and more particularly to a rotation detecting device which is mounted on a transmission of an automobile and converts the rotation of the transmission into an electric signal and outputs the electric signal to an indicating instrument.

[0002]

2. Description of the Related Art Conventionally, as a vehicle speed sensor mounted on an automobile, the rotation of an automobile transmission is transmitted to a magnet disposed in a housing, and a change in a magnetic field due to the rotation is detected by a magnetic sensing element. 2. Description of the Related Art Semiconductor-type rotation detecting devices that output electric signals generated by elements to various indicating instruments and the like are widely used.

FIG. 2 shows such a conventional rotation detecting device. The rotation detecting device 1 has a cylindrical housing 2, and the housing 2 includes a driving side housing 2a and an electric wiring. They are integrally formed by joining the side housings 2b. Drive side housing 2
A mounting recess 3 having an internal thread formed on the inner peripheral surface is formed at one end of the connector a.

A rotor 4 is rotatably disposed inside the drive-side housing 2a. The rotor 4 has, for example, a multipolar magnetized end face. An input rotary shaft 6 rotatably supported by a bearing 5 is fitted into the center of the rotor 4.
The housing 2 is fixed by screwing the mounting concave portion 3 of the drive side housing 2a into a sensor mounting portion on the vehicle body side having an external thread formed on the outer peripheral surface, and the housing 2 is fixed to the input rotary shaft 6 in this state. A rotation transmission shaft (not shown) on the vehicle body side is connected, and rotation from a transmission is transmitted to the rotor 4 via the input rotation shaft 6.

A wiring board 7 is disposed inside the electric wiring side housing 2b.
Is mounted with a magnetically sensitive element 8 such as a Hall element, for example, in which a detecting unit is disposed so as to face the peripheral surface of the rotor 4 and face it. In addition, the wiring board 7 includes
An electric component 9 such as an IC chip is mounted by soldering or the like, and a wiring 10 for sending an electric signal generated by the magnetically sensitive element 8 to an indicator (not shown) is connected to the wiring board 7. Have been.

Then, as shown in FIG. 3, the wiring board 7 is fixed inside the electric wiring side housing 2b so that the electric parts 9 and the like are located on the inner surface of the electric wiring side housing 2b. A filler 11 such as a resin is injected between the inner surface of the wiring-side housing 2b and the wiring board 7 and into the side surface of the rotor 4 of the wiring board 7, respectively. The components are protected, the power supply wiring and the signal output wiring are secured against vibration and the water and the like are prevented from entering the circuit components of the wiring board 7.

In the above-described conventional rotation detecting device 1, the rotation detecting device 1 transmits the rotation of the transmission of the vehicle to the rotor 4 via the input rotation shaft 6, and the rotation of the rotor 4 causes the magnetically sensitive element 8 to rotate. By outputting the electric signal generated in the above to a predetermined indicating instrument via the wiring 10, a speed display or the like according to the value of the electric signal is performed.

[0008]

However, in the conventional rotation detecting device 1 described above, the electric wiring housing 2 is not provided.
The filler 11 is injected and cured while the wiring board 7 is fixed with respect to b. However, as shown in FIG. 4, high heat is applied to the filler 11 due to a change in the external environment temperature. The filler 11 expands and deforms due to the heat, thereby causing deformation or cracking of the wiring board 7 or deformation of the wiring board 7 such as the solder of the electric component 9 or the like. There is an inconvenience that a crack occurs in the connection portion. As a result, there is a disadvantage that the electric component 9 is damaged or the wiring 10 is disconnected, an operation failure occurs, and the reliability of the device is significantly reduced.

The present invention has been made in view of the above points, and even when the filler is deformed, it is possible to reliably prevent damage to a wiring board, electric parts, and the like, thereby improving the reliability of the apparatus. It is an object of the present invention to provide a rotation detecting device that can be significantly improved.

[0010]

In order to achieve the above object, a rotation detecting device according to the present invention comprises a rotor having a magnetic force inside a housing and rotatably connected to a predetermined rotation output source. A magnetic sensing element mounted on a predetermined wiring board, various electric components, and a wiring for outputting a signal generated by the magnetic sensing element to the outside are disposed near the rotor in the housing, and a surface portion of the wiring board is provided. the in rotation detecting apparatus comprising <br/> covered with a coating agent, the substrate holding plate and disposed group <br/> plate holding plates in the interior of the housing in the housing
To be held by the substrate holding plate.
The wiring board is held by the board holding plate part,
Each of the above-mentioned wiring boards held by the board holding plate portion
TYPE ELECTRIC COMPONENT AND WIRING BOARD MOUNTED WITH THE MAGNETIC SENSITIVE ELEMENT
Part is open to the rotor side,
When covering the above various electric parts of the wiring board part with the above coating agent,
Both hold the board holding plate inside the housing
C on the opposite side of the rotor with the housing
Fill the inside of the housing with the above coating agent,
The wiring board from outside of the housing
And the rotor is shielded .

[0011]

According to the present invention, the wiring board is held by the board holding plate.
The board holding plate is held in the housing.
The wiring board is not limited to the board holding plate.
Reinforced by the housing that holds the board holding plate
Therefore, the housing portion holding the substrate holding plate is sandwiched.
To fill the inside of the housing opposite the rotor
Temperature rises due to changes in the external environment temperature
Even if expanded, the stress is not applied to the wiring board and the board is held
Hangs on boards and housings. According to the present invention,
The coating agent covering the electrical components is used for various electrical components and various electrical components
Is open to the rotor side together with the wiring board
Covering various electrical components
But expands due to high temperature due to the change of external environment temperature
The stress does not reach the wiring board and escapes to the rotor side.
You. Therefore, the wiring board changes due to the stress caused by the expansion of the coating agent.
The wiring board is broken by the shape or the stress caused by cracking or expansion of the coating material.
Cracks occur at the solder joints of various electrical components on the board,
Connection failure or damage to the electrical components themselves
It is necessary for the wiring board to be
Both can be reliably prevented by reinforcement and relief of stress to the rotor side .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 shows an embodiment of the rotation detecting device according to the present invention.
And a cylindrical housing 2 composed of an electric wiring side housing 2b. At one end of the driving side housing 2a, a mounting recess 3 having an internal thread formed on an inner peripheral surface is formed.

A rotor 4 whose end face is multipolarly magnetized is rotatably disposed inside the drive-side housing 2a, and a center of the rotor 4 is rotatably mounted on a bearing 5. The input rotary shaft 6 supported by the shaft is fitted. The housing 2 is fixed by mounting the mounting concave portion 3 of the drive side housing 2a on the sensor mounting portion on the vehicle body side. In this state, the transmission 4 is transmitted to the rotor 4 via the input rotary shaft 6 from the transmission. The rotation is transmitted.

Further , inside the drive side housing 2a,
At a position closer to the electric wiring side housing 2b than the rotor 4,
The board holding plate 1 is held by the drive side housing 2a.
2 are fixed, the rotor 4 side in the substrate holding plate 12
(A substrate holding plate located on the rotor side)
(Corresponding to the part) at the position near the input rotary shaft 6 and near the periphery
In FIG. 2, two holding ribs 13 are formed concentrically in a rising manner. In addition, the inside of these two holding ribs 13
An annular wiring board 7 is disposed on the substrate holding plate 12 , and a lower surface 7 a of the wiring board 7 (various electric components and
On the side of the wiring board on which the magnetically sensitive element is mounted) , a magnetically sensitive element 8 such as a Hall element is mounted in which the detection unit is disposed so as to face and close to the end face of the rotor 4. I have. Further, on the lower surface 7a side of the wiring board 7,
Electrical parts 9 such as an IC chip have been implemented, the electric
The parts 9 are electrically connected to the wiring board 7 by soldering or the like.
Are, furthermore, this wiring board 7, a wiring 10 for transmitting the indicating instrument or the like (not shown) an electrical signal generated by the magnetically sensitive element 8 is connected.

In assembling, first, the wiring substrate 7 is fixed to the substrate holding plate 12, and then the lower surface 7a of the wiring substrate 7 located on the rotor 4 side or mounted on the lower surface 7a.
Filled electrical component 9 with filler 11 such as resin (corresponding to coating agent)
And the wiring board 7 covered with the filler 11
Interior of the drive housing 2a of the substrate holding plate 12 having a
Then, after assembling at a position closer to the electric wiring side housing 2b than the rotor 4 , the driving side housing 2a is connected to the electric wiring side housing.
And the rotor of the wiring holding plate 12.
4 and the electrical wiring side housing located on the opposite side to
Filler 11 is injected into the inside of the drive side housing 2a surrounded by the ring 2b, and the filler 11 protects the circuit components of the wiring board 7, protects the power supply wiring and the signal output wiring. Vibration-resistant fixing and prevention of intrusion of water and the like into circuit components of the wiring board 7 are achieved.

Next, the operation of this embodiment will be described.
When the rotation detection device 1 performs predetermined rotation detection, the rotation of the transmission of the automobile is determined by the input rotation shaft 6.
And the rotation of the rotor 4 outputs an electric signal generated by the magnetically sensitive element 8 to a predetermined indicating instrument via the wiring 10 so that a speed corresponding to the value of the electric signal is output. Display and the like are performed.

In this embodiment, the electric components 9
So that the lower surface 7a on which the components are mounted is located on the rotor 4 side.
Board holding plate held inside the drive side housing 2a
12, the wiring board 7 is held on the lower surface 12a, and in this state, the upper surface 12b of the wiring holding plate 12 is
Of the drive-side housing 2a surrounded by the
Opposite to the rotor across the housing that holds the holding plate
Of the circuit board 7) and the lower surface 7a of the wiring board 7 and the electric power mounted thereon.
Since the air component 9 is covered with the filler 11, the temperature of the filler 11 becomes high due to a change in the external environment temperature. Deformation of the substrate holding plate 12 or
Is not applied directly to the wiring board 7 by receiving it by the drive side housing 2a which holds the wiring board 7. Even if the filler 11 on the electric component 9 side of the wiring board 7 thermally expands, the expansion The deformation can be released to the rotor 4 side, and it is possible to prevent a strong stress from being applied to the electric component 9 and the like.

Therefore, in this embodiment, the deformation of the filler 11 due to the change of the external environment temperature is prevented by the substrate holding plate 12
This can be received by the drive-side housing 2a that holds the electric component 9 and the deformation of the filler 11 on the electric component 9 side of the wiring board 7 can be released, so that strong stress is prevented from being applied to the electric component 9 and the like. By reliably preventing cracks or damage to the wiring board 7, damage to the electric components 9 and the like, disconnection of the wiring 10, and the like, malfunctions can be prevented and the reliability of the device can be significantly improved.

[0019]

As described above, in the rotation detecting device according to the present invention, the wiring board is held by the board holding plate.
This board holding plate is held by the housing
From this, the wiring board is not only
Reinforced by the housing that holds the
What is the above rotor with the housing part holding the holding plate in between?
The coating on the inside of the housing on the opposite side
Even if it expands due to high temperature due to a change in environmental temperature,
Force is not applied to the wiring board but to the board holding plate or housing
Call Further, according to the present invention, a coating covering various electric components is provided.
Is used for various electrical components and wiring bases on which various electrical components are mounted.
Together with the plate part and open to the rotor side.
Therefore, the coating agent covering various electrical components
Even if the temperature rises due to the change and expands, the stress will not
Escape to the rotor side without touching the plate. Therefore, the swelling of the coating agent
The wiring board is deformed, cracked, or covered by the stress caused by tension.
Of various electrical components on the wiring board by the stress caused by the expansion of the agent
A crack may occur at the connection, resulting in poor electrical connection or
The damage of the component itself may be caused by the board holding plate and
Reinforcement of wiring board by housing and stress on rotor side
Escape can surely prevent any of them , and as a result, it is possible to prevent malfunctions and significantly improve the reliability of the apparatus.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a rotation detecting device according to the present invention.

FIG. 2 is a longitudinal sectional view showing a conventional rotation detecting device.

FIG. 3 is an enlarged sectional view showing a conventional wiring board portion.

FIG. 4 is an enlarged cross section showing a state of thermal expansion deformation of a conventional wiring board portion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rotation detection apparatus 2 Housing 4 Rotor 6 Input rotation axis 7 Wiring board 7a Wiring board lower surface (Various electric components and magnetic sensitive elements
8 Mounted magnetic substrate 9 Electric component 10 Wiring 11 Filler 12 Substrate holding plate 12a Lower surface of substrate holding plate (holding substrate located on rotor side)
13 ) Rib for holding

Claims (1)

(57) [Scope of request for utility model registration] 1. A magnetically responsive rotor mounted in a housing and having a magnetic force and connected to a predetermined rotary output source and rotatably disposed on a predetermined wiring board near the rotor in the housing. elements, various electric parts and is disposed wires for outputting a signal generated by the magnetically sensitive element to the outside, in the rotation detecting device comprising covering the surface portion of the wiring substrate with a coating agent, base plate inside said housing Arrange the holding plate and this board
Hold the holding plate with the housing and use the board holding plate
The wiring is performed by the board holding plate located on the rotor side.
Hold the board and hold it on the board holding plate.
The above-mentioned various electric components and the above-mentioned magnetic sensitivity in the wiring board
Open the wiring board on which the elements are mounted to the rotor side.
The wiring board part.
Cover the part with the coating material and inside the housing.
With the housing part holding the substrate holding plate sandwiched
Cover the inside of the housing opposite the rotor
And the above coating material
A rotation detecting device for shielding the wiring board and the rotor from outside of the motor.