JPH06280973A - Position signal generating device - Google Patents

Abstract

PURPOSE:To enhance the accuracy in the angle of electric continuity by fitting a contacting spring with a plurality of contact pieces in positions at different distances from the rotational center of a moving body, integrally mounting the spring on this moving body, and putting in slide-contact with a copper foil pattern on a printed circuit board installed in a housing. CONSTITUTION:A movable body 2 is accommodated rotatably in a housing, and a contacting spring 4 fitted with a plurality of contact pieces 41 in positions at different distances from the rotational center of this movable body 2 rigidly in a single piece therewith, and a printed circuit board 3 is installed on the inside surface of the housing. A stationary contact 31 is formed from a copper foil pattern 30 in the position on the board 3 mating with each changeover position of a shift lever for tone contact pieces 41. Thereby three switch parts are formed wherein turning-on and -off are made with changing-over of the shift lever by allowing the contacting spring 4 to close and open two stationary contacts 31 lying on different rotational loci and the combination on/off condition according to each shift position is changed over in such a way as different from case to case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking, a rear, a neutral, a drive, a drive, and
The present invention relates to a position signal generator that generates an output indicating a shift position of first speed (first speed) (or low speed).

[0002]

2. Description of the Related Art In an automatic vehicle, a position signal generator for generating an output indicating a shift position of parking, rear, neutral, drive, second speed, first speed (or low) by switching a shift lever is used. An operation command is given to the microcomputer of the control system according to the shift position output of.

In a conventional position signal generator of this type, as shown in FIG. 8, a housing 1 consisting of a body 1a and a cover 1b and a housing 1 is rotatably housed in the housing 1 in the form shown in FIG. It is composed of a movable body 2 which can be moved. The body 1a and the cover 1b are formed with an insertion hole 10b through which a shift lever (or a shaft that is integrally rotated with the shift lever) is inserted. The insertion hole 10b has a substantially fan shape with the insertion hole 10b as a center. A recess 10a is formed. A plurality of conductive plates 15 are embedded in the recesses 10a, and the fixed contacts 13 are exposed from the recesses 10a in each conductive plate 15.

The movable body 2 is a ring-shaped portion 2a fitted to the shift lever (or a shaft which is connected to the shift lever and integrally rotates) which is passed through the inside of the housing 1.
Is formed, and integrally rotates according to the rotation of the shift lever. The recess 1 of the housing 1 extends from the ring-shaped portion 2a.
A movable piece 2b is provided so as to rotate in a space formed by 0a. The movable contact 21 is integrally attached to the movable piece 2b. Although the detailed structure is not described, the movable contact 21 facing the body 1a and the cover 1b is the body 1
They are elastically pressed against a and 1b, respectively.

In this position signal generator, the movable body 2 is integrally rotated in response to the rotation operation of the shift lever, and the movable contact 21 is brought into contact with or separated from the fixed contact 13 to obtain a switching output. To be

[0006]

In the position signal generator, the conduction angle between the movable contact 21 and the fixed contact 13 is regulated by the molding rib 14. That is, as shown in FIG. 12, when the molding rib 14 is formed higher than the height of the fixed contact 13 and the movable contact 21 is located at a position corresponding to the molding rib 14, the movable contact 21 contacts the fixed contact 13. Therefore, the conduction angle between the movable contact 21 and the fixed contact 13 is regulated. However, there is a problem in that the molding rib 14 tends to cause dimensional variation and the conduction angle cannot be controlled accurately. Further, in the case of the conventional position signal generator, since the switching state of each contact is output as it is, there is a problem that the number of output lines increases.

The present invention has been made in view of the above points, and an object thereof is to provide a position signal generator capable of improving the accuracy of the conduction angle and reducing the number of output lines. To do.

[0008]

According to the present invention, in order to achieve the above object, a movable body that rotates in a housing in response to a switching operation of a shift lever, is integrally attached to the movable body, and From a contact spring having conductivity, in which a plurality of contact pieces are formed at different positions from the center of rotation of the movable body, and a printed circuit board mounted on the inner surface of the housing facing the rotation position of the contact spring. Becomes
The contact pieces of the contact springs are elastically brought into contact with the printed circuit board, and the contact springs are respectively attached to the contact surfaces of the contact pieces of the printed circuit board corresponding to the switching positions of the shift levers of the contact pieces on the rotation loci of these contact pieces. The fixed contact part that contacts one piece is formed with a copper foil pattern, and the fixed contact parts on different rotation paths are short-circuited and opened with a contact spring, and the combination according to the switching position of the shift lever The on and off states are all different Three switch sections that can be switched depending on the state are formed, and a signal generation circuit that generates signals of different voltage levels or current levels according to each shift position is formed on the printed circuit board by turning these switch sections on and off.

[0009]

According to the present invention, by forming the fixed contact portion using the copper foil pattern of the printed circuit board as described above, it is possible to regulate the width of the fixed contact portion with high accuracy and to improve the accuracy of the conduction angle. Increase. Further, there are three switch parts which can be switched in different combinations of ON and OFF states according to the shift position of the shift lever, and signals of different voltage levels or current levels depending on each shift position depending on the ON and OFF states of these switch parts. By providing a signal generation circuit that generates a signal indicating a shift position at a voltage level or a current level, it is possible to output a signal indicating a shift position on a pair of signal lines, and to reduce the number of output lines. Reduce.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. Position signal generator of this embodiment is the switching of the shift lever on, off by the combination ON corresponding to each shift position, and three switch portions SW ₁ to SW ₃ the OFF state is switched every differently, these switches on parts SW ₁ to SW _3, it is constituted by a voltage signal generating circuit 5 for generating a signal in the off state to the accompanying different voltage levels corresponding to each shift position (or current level).

The three switch sections SW _{1 to} SW ₃ are
A housing 1 including a body 1a shown in FIG. 1 and a cover (not shown), a movable body 2 rotatably accommodated in the housing 1, and a contact spring having conductivity attached integrally to the movable body 2. 4 and a printed circuit board 3 mounted on the inner surface of the housing 1 so as to face the rotational position of the contact spring 4.

The body 1a is formed with a through hole 10b through which a shift lever (or a shaft which rotates integrally with the shift lever) is inserted. The through hole 10b is formed.
The concave portion 10a is formed in a substantially fan shape centered on the center. The structure of the cover is almost the same. Movable body 2
As shown in FIG. 3, a ring-shaped portion 2a is formed that is fitted to the shift lever (or a shaft that rotates integrally with the shift lever and is integrally rotated) that is passed through the inside of the housing 1. Yes, it rotates integrally with the rotation of the shift lever. A movable piece 2b is provided so as to project from the ring-shaped portion 2a so as to rotate in a space defined by the body 1a and the substantially fan-shaped recess 10a of the cover. The center of the movable piece 2b is recessed,
A comb-teeth-shaped contact spring 4 is attached to this recess. As shown in FIG. 3C, the contact spring 4 has four contact pieces 41 that obliquely project in the direction of the body 1a, and a movable contact 42 is fixed to the tip thereof.

The printed circuit board 3 has a recess 10a in the body 1a.
Attached to. Here, as shown in FIG.
As shown in FIG. 3, a positioning hole 32 is formed for positioning and mounting with respect to the body 1a.
2 is fitted and attached to two cylindrical bosses 11 protruding from the inner surface of the recess 10a. As shown in FIG. 2, a fixed contact portion 31 that comes into contact with and separates from the movable contact 42 is formed by a copper foil pattern 30 at a position on the printed circuit board 3 that corresponds to the rotation trajectory of each movable contact 42. is there. In addition, each fixed contact point 31 on the same locus
Are connected to each other at a position where they do not contact the movable contact 42. Further, the innermost fixed contact portion 31 is the movable contact 4 at all times.
Touch 2.

In this position signal generator, when the movable body 2 integrally rotates in response to the rotation operation of the shift lever, the fixed contact portion 3 on different rotation loci is moved by the contact spring 4.
1 is short-circuited and opened to obtain a contact switching output. By forming the fixed contact portion 31 with the copper foil pattern 30 of the printed circuit board 3 as described above, the width of the fixed contact portion 31 can be accurately regulated, and thus the precision of the conduction angle can be increased.

Each of the switch parts SW _{1 to} SW ₃ comprises an innermost fixed contact part 31 and a contact spring 4,
The fixed contact portion 31 on the outermost turning locus and the above-described configuration constitute the switch unit SW _1. Next, the fixed contact portion 31 on the outermost turning locus and the above-described configuration form the switch unit SW 1.
₂ , and the fixed contact portion 31 on the third rotation locus and the above-mentioned configuration constitute a switch portion SW ₃ . Each of these switch units SW _{1 to} SW ₃ includes parking, rear, neutral, drive, and
Depending on each shift position of the first speed, the first speed (or the low speed), the combination on / off states can be switched so that they are all different. That is, each switch unit SW _{1 to} SW ₃
Is formed so that the shift position switching position is indicated by 3 bits of the digital signal.

Next, the signal generation circuit 5 formed on the printed circuit board 3 will be described. As shown in FIG. 4, the voltage No. 3 generation circuit 5 includes the switch units SW ₁ of the DC power source E.
~ SW ₃ and resistors Rx, 2Rx, 4 connected in series, respectively
A series circuit composed of Rx is connected in parallel. Then, it is connected between the input terminal of the amplifier circuit 6 using the operational amplifier OP ₁ and the positive terminal of the DC power source E. The amplifier circuit 6 is provided on the side of the control system that controls the drive mechanism of the vehicle.

In this embodiment, the switch units SW _{1 to} SW ₃
The resistance value connected to the input of the amplifier circuit 6 is changed by turning on and off, and the amplification factor of the amplifier circuit 6 is changed, and a signal indicating each shift position is output at the voltage level (or current level). . By thus indicating each shift position by the voltage level (or current level), the signal indicating the shift position can be output using the pair of signal lines, and the number of output lines can be reduced. .

By the way, in the above case, the switch SW
₁~ SW₃Directly to the resistors Rx, 2Rx, 4Rx
However, as shown in FIG. 5, the resistance R
Transistor Q in series with x, 2Rx, 4Rx₁~ Q₃To
Connect the above switch SW ₁~ SW₃With transistor
Q₁~ Q₃May be biased. this
In case of switch SW₁, ~ SW₃Generated from the structure of
It is possible to eliminate the contact voltage drop.

Further, as shown in FIG. 6, the switch unit SW
Using photocouplers PC _{1 to} PC ₃ whose output transistors are turned on and off in the respective ON and OFF states of _{1 to} SW ₃ ,
Switch portion SW ₁ and power supplied to a series circuit of an input light emitting diode to SW ₃ of each series-connected photo-coupler PC ₁ to PC _3, the resistor and the output transistor of the photocoupler PC ₁ ~PC ₃ Rx, 2Rx , 4Rx series circuit may be separated from the power supply. By doing so, it is possible to eliminate the contact voltage drop of the switch units SW _{1 to} SW ₃ and remove the influence of power supply noise.

The following table shows the relationship between each shift position and the output of the amplifier circuit 6 in the above case.

[0021]

[Table 1]

In the above table, the resistances Rf = 10 kΩ, R
The case where x = 5.1 kΩ and the power supply of the operational amplifier is ± 5 V is shown. By the way, the contact piece 41 of the contact spring 4 may be configured to project in the left-right direction as shown in FIG.
Further, as shown in FIG. 8, the movable body 2 is fixed to the opposite side of the printed board 3, the contact piece 41 is bent into a substantially semicircular shape, and the movable contact 42 is provided at the tip portion located on the side facing the printed board 3. You may fix. By doing so, it is possible to disperse the load in the rotating direction of the movable body 2 and prevent the contact piece 41 from being subjected to an unbalanced load, and the uneven wear of the movable contact 42 causes the life of the movable contact 42. Can be prevented from becoming short.

Further, one boss 11 formed on the body 1a for positioning and mounting the printed circuit board 3 thereon.
9 to set the movable body 2 to the neutral position.
A hole 12 for mounting the set pin 7 shown in (a) is formed. That is, when the position signal generator is attached to the vehicle, various adjustments are performed while fixing the position signal generator at the neutral position. At this time, set the set pin 7 to the body 1
It is inserted into the set hole 22 formed in the movable body 2 through the hole 12 of the boss 11 of a. When the adjustment is completed, the shift lever is used to perform a switching operation to move the movable body 2
Is moved to break the set pin 7. Therefore, the set pin 7 is formed with a constriction 7a at a portion between the movable body 2 and the body 1a so that the set pin 7 can be easily broken. In addition, in the portion located inside the hole 12, O
The ring 71 is fitted to maintain the airtightness of the inside of the housing 1, and the body 1a has a structure that does not deteriorate the airtightness through the hole 12.

[0024]

As described above, according to the present invention, the movable body which rotates in the housing in response to the switching operation of the shift lever, and the movable body which is integrally attached to the movable body and which moves from the center position of rotation of the movable body. A contact spring having conductivity, in which a plurality of contact pieces are formed at different distances, respectively, and a printed circuit board mounted on the inner surface of the housing facing the rotating position of the contact spring. Make elastic contact with the printed circuit board, and on the rotation locus of these contact pieces,
On the contact surface of the contact piece of the printed circuit board corresponding to the switching position of the shift lever of the contact piece, the fixed contact portions that come into contact with the respective contact spring pieces are formed with a copper foil pattern, and the fixed contact portions on different rotation paths are Composed of three contact parts that are short-circuited and opened by contact springs according to the shift position of the shift lever, and switch on and off in different states. These switch parts are turned on and off according to each shift position. A signal generation circuit that generates signals of different voltage levels or current levels is formed on the printed circuit board, and the fixed contact part is formed using the copper foil pattern of the printed circuit board. The width of the portion can be regulated, and the accuracy of the conduction angle can be improved. Further, there are three switch parts which can be switched in different combinations of ON and OFF states according to the shift position of the shift lever, and signals of different voltage levels or current levels depending on each shift position depending on the ON and OFF states of these switch parts. And a signal generation circuit for generating
Since the signal indicating the shift position is generated at the voltage level or the current level, the signal indicating the shift position can be output by the pair of signal lines, and the number of output lines can be reduced. Furthermore, since the signal generating circuit is integrally formed on the printed circuit board, there is no need to provide the printed circuit board outside, and the position signal generator can be downsized.

[Brief description of drawings]

1A to 1C are a plan view showing a structure of a body of an embodiment of the present invention, a sectional view taken along the line AA of FIG. 1A, and a bottom view.

2A and 2B are a plan view and a bottom view of a printed circuit board.

3A to 3C are a plan view, a side view, and a sectional view taken along line BB of FIG. 3A.

FIG. 4 is a circuit diagram showing a signal generation circuit.

FIG. 5 is a circuit diagram showing another configuration of a signal generating circuit.

FIG. 6 is a circuit diagram showing a signal generation circuit having another configuration.

7A to 7C are a plan view, a side view, and a cross-sectional view taken along the line CC of FIG. 7A, showing a movable body having another structure.

8A to 8D are a plan view, a side view, a rear view and a sectional view taken along line D-D of FIG. 8C showing a movable body having another structure.

9A and 9B are a side view of a set pin and an explanatory view of a mounting state thereof.

FIG. 10 is an exploded plan view showing the structure of a conventional position signal generator.

FIG. 11 is a cross-sectional view of the same as above after assembly.

FIG. 12 is an enlarged sectional view of a main part.

[Explanation of symbols]

1 Housing 2 Movable Body 3 Printed Circuit Board 4 Contact Spring 5 Signal Generation Circuit 30 Copper Foil Pattern 31 Fixed Contact Part 41 Contact Piece 42 Movable Contact SW _{1 to} SW ₃ Switch Part

Claims (1)

[Claims] 1. A parking system is provided by switching a shift lever.
A position signal generator for generating outputs indicating shift positions of rear, neutral, drive, second speed, first speed (or low), and a movable body that rotates in the housing in response to a shift lever switching operation. It is integrally attached to the movable body and has a conductive contact spring in which a plurality of contact pieces are formed at different positions from the rotation center position of the movable body, and the contact spring is opposed to the rotation position of the contact spring. And a printed circuit board mounted on the inner surface of the housing, the contact pieces of the contact spring are elastically contacted with the printed circuit board, and a print corresponding to the shift position of the shift lever of the contact piece is made on the rotation locus of these contact pieces. On the contact surface of the contact piece of the substrate, fixed contact parts that come into contact with the respective contact spring pieces are formed with a copper foil pattern, and the contact springs between the fixed contact parts on different rotation paths are contact springs. Composed of three switch parts that are short-circuited and open depending on the switching position of the shift lever to switch the on / off states to different states. Depending on the on / off states of these switch parts, different voltage levels according to each shift position are formed. Alternatively, a position signal generating device comprising a signal generating circuit for generating a current level signal formed on the printed circuit board.