JP4650796B2 - Range detector - Google Patents

Description

  The present invention relates to a range detection device that is attached to a hydraulic control device that switches a shift stage of an automatic transmission and detects which range the shift stage is selected.

  Conventionally, this type of range detection apparatus is disclosed in Patent Document 1 and the like. The conventional range detection device shown in FIG. 7 is provided in a hydraulic control device and works together with a hydraulic switching valve that switches a gear position, and a plate-shaped movable member with a magnet attached to the plate surface, and the movable member can be slid. And a resin fixed member having a sliding wall portion facing the plate surface of the movable member.

A substrate is disposed in a recess formed on the surface of the sliding wall opposite to the movable member, and the substrate is sealed by filling the recess with a resin sealing material. This sealing prevents the substrate from being exposed to hydraulic oil or the like of the automatic transmission.
A magnetic detection element for detecting magnetism by a magnet and other electronic components are mounted on the substrate. When the hydraulic switching valve is activated, the movable member slides relative to the fixed member. At this time, the magnetic detection element of the stationary member detects the magnetism of the magnet of the movable member, so that the hydraulic switching valve detects the operating position. is doing.

German Patent No. 20320742

However, in the range detection apparatus having the above configuration, there arises a problem that the movable member cannot smoothly slide. And it became clear by examination and various tests by the inventors of the present application that this problem is caused by the following causes.
That is, in filling the resin sealing material into the concave portion of the sliding wall portion by potting, the resin sealing material shrinks when it is cured. Then, due to this contraction, the resin-made fixing member is slightly deformed in the directions indicated by the arrows L1 and L2 in FIG. 7A, and as a result, the sliding wall portion of FIG. It was found that it deformed around an axis θ1 extending in the direction perpendicular to the paper surface (see arrow L2), and the movable member could not slide smoothly due to this deformation.

  To solve this problem, simply increasing the thickness t0 of the sliding wall can suppress the deformation indicated by the arrow L2 of the sliding wall and smoothly move the movable member. Since the distance from the magnet is increased, the magnetic detection accuracy of the magnetic detection element is lowered, and as a result, the accuracy of range detection for detecting which range is selected for the shift stage of the automatic transmission is lowered.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a range detection device that achieves both a smooth slide movement of a movable member and suppression of a decrease in range detection accuracy.

According to the first aspect of the present invention, the other electronic components are mounted on the surface of the substrate opposite to the sliding wall portion, and the plurality of magnetic detection elements are mounted on the surface of the substrate on the sliding wall portion side. ing. Further, the plurality of magnetic detection elements are provided in the bottom surface of the concave portion of the sliding wall portion and are accommodated in a groove portion having a shape corresponding to the shape of the plurality of magnetic detection elements.
According to this, other electronic components other than the magnetic detection element are mounted on the surface of the substrate opposite to the sliding wall portion, and only a plurality of magnetic detection elements are mounted on the surface on the sliding wall portion side. Will be implemented. Therefore, the concave portion formed in the sliding wall can be shaped so that the portion facing the magnetic detection element is deep and the portion of the substrate facing the non-mounting portion where the magnetic detection element is not mounted is shallow. That is, the portion of the sliding wall that faces the magnetic detection element is thin, and the portion of the substrate that faces the non-mounting portion can be thick.

Therefore, compared with the conventional structure (refer FIG.7 (C) (D)) which mounted the other electronic component on the surface by the side of a sliding wall part among board | substrates, the thick part of a sliding wall part can be increased. Therefore, deformation of the sliding wall can be suppressed. In addition, since the portion of the sliding wall that faces the magnetic detection element is thin, it is possible to suppress the distance between the magnetic detection element and the magnet from being reduced, and the magnetic detection accuracy of the magnetic detection element and thus the range detection accuracy is reduced. Can be suppressed.
As described above, according to the present invention, it is possible to achieve both a smooth sliding movement of the movable member and a suppression of a decrease in range detection accuracy.

Here, an imaginary axis orthogonal to the slide movement direction and extending parallel to the plate surface of the movable member is defined as an axis θ1 (see FIG. 7A), and an imaginary axis extending in the slide movement direction is defined as an axis θ2 (see FIG. 7). 7 (B)). When the length W1 (see FIG. 7A) orthogonal to the sliding movement direction of the movable member is shorter than the length W2 in the sliding movement direction (see FIG. 7A). Suppressing the deformation around the axis θ1 (see the arrow L2 in FIG. 7A) among the deformation of the sliding wall portion causes the deformation around the axis θ2 (see the arrow L3 in FIG. 7B). Compared with the case where it suppresses, it will contribute greatly to making the sliding movement of a movable member smooth.
In view of this point, in the invention described in claim 2, since the plurality of magnetic detection elements are arranged side by side in a direction perpendicular to the slide movement direction, the thick wall portion of the sliding wall portion is increased in the slide movement direction. Can do. Therefore, since the deformation of the sliding wall portion around the axis θ1 can be greatly suppressed, the sliding movement of the movable member can be made even smoother.

According to the fifth aspect of the present invention, the sliding wall portion is integrally formed of resin with ribs positioned between the plurality of magnetic detection elements and separating the groove portions from each other . Therefore, since the area of the thick part of a sliding wall part can be enlarged, a deformation | transformation of a sliding wall part can be suppressed further, and the sliding movement of a movable member can be made still smoother.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic diagram illustrating a range detection device according to the present embodiment, and FIG. 2 is an exploded perspective view illustrating a position where the range detection device is attached to the hydraulic control device 10.

When a vehicle occupant selects a shift range (gear stage) and operates a shift lever (not shown), the operating force of the shift lever is transmitted through the cable 1, the link mechanism 2 and the detent lever 3 shown in FIG. Is transmitted to the manual valve 11. When the manual valve 11 is reciprocated in the case 12 by the operating force, the oil passage in the hydraulic control device 10 is switched. Then, the supply of the line pressure hydraulic fluid to a plurality of friction elements (clutch or brake) of the automatic transmission (not shown) is controlled, and the plurality of friction elements are engaged in a combination having a selected shift range, and as a result Switch to the selected shift range.
The manual valve 11 corresponds to a “hydraulic switching valve” described in the claims.

  The range detection device detects which range is selected as the shift range of the automatic transmission. As shown in FIGS. 1 and 2, the range detection device includes a movable member 20 and a fixed member 30. Configured. These movable member 20 and fixed member 30 are installed in an oil pan (not shown) of the automatic transmission.

Next, the structure of the movable member 20 and the fixed member 30 will be described in detail with reference to FIGS.
The movable member 20 includes an engagement pin 21 that engages with the manual valve 11, and a plate-shaped plate portion 22 that is supported by the fixed member 30 so as to be slidable. The plate portion 22 is integrally formed of resin. The movable member 20 slides in the linear direction in conjunction with the manual valve 11 sliding in the case 12.
Further, the plate-shaped plate portion 22 is formed in a rectangular shape having the sliding direction as a longitudinal direction, and is formed such that a length W1 orthogonal to the sliding movement direction is shorter than a length W2 in the sliding movement direction. Yes.

  The fixed member 30 is a member that is attached to the case 12 of the hydraulic control device 10 and supports the movable member 20 so as to be slidable. The fixed member 30 includes a sliding wall portion 31 that faces the plate surface of the plate portion 22 of the movable member 20, and an engaging portion 32 that slidably engages with the end portion 23 of the plate portion 22. The sliding wall portion 31 and the engaging portion 32 are integrally formed of resin. The engaging portion 32 has a shape extending from both ends of the sliding wall portion 31 so as to sandwich the plate portion 22 and extending in the sliding movement direction.

  A concave portion 31a is formed on the surface of the sliding wall portion 31 opposite to the movable member 20, and the substrate 40 is accommodated in the concave portion 31a. The recess 31a is filled with a resin sealing material 50 by potting, and the substrate 40 is sealed in the recess 31a by the resin sealing material 50.

  Hall ICs 41, 42, and 43 as magnetic detection elements are mounted on the surface of the substrate 40 on the sliding wall portion 31 side. A capacitor 44 and a resistor 45 are surface-mounted on the surface of the substrate 40 opposite to the sliding wall portion 31. Further, a terminal 46 that is inserted from the sliding wall portion 31 side and soldered on the surface opposite to the sliding wall portion 31 is inserted and mounted on the substrate 40. The plurality of Hall ICs 41, 42, and 43 are arranged side by side in a direction orthogonal to the direction of slide movement.

  Inside the movable member 20, a plurality of magnets 51, 52, and 53 corresponding to the Hall ICs 41, 42, and 43 are arranged (see FIG. 3A). These magnets 51 to 53 are arranged in a direction perpendicular to the direction of slide movement in the same manner as the Hall ICs 41 to 43, and are disposed at positions facing the Hall ICs 41 to 43. The magnets 51 to 53 have a shape extending in the slide movement direction, and N poles and S poles are alternately arranged in the longitudinal direction.

And each Hall IC41-43 detects the magnetism by the N pole of the corresponding magnets 51-53, and the magnetism by a S pole.
For example, when the movable member 20 slides from the position shown in FIG. 3 (A) to the left side in the drawing and the dot-and-dash line position indicated by the symbol P among the magnets 51 to 53 overlaps with the hall ICs 41 to 43, the hole The IC 41 detects S pole magnetism, the Hall IC 42 detects N pole magnetism, and the Hall IC 43 detects N pole magnetism.

The solid line in FIG. 3 (B) indicates the change in magnetism on the Hall ICs 41 to 43. As the movable member 20 slides to the left from the position shown in FIG. 3 (A), the solid line in FIG. The magnetism changes as shown.
The Hall ICs 41 to 43 output a high level (H) signal when the N pole magnetism is detected, and output a low level (L) signal when the S pole magnetism is detected. Symbols S1, S2, and S3 in FIG. 3C indicate signals output by the Hall ICs 41, 42, and 43, respectively, and as the movable member 20 slides to the left from the position shown in FIG. As shown in FIG. 3C, the output signals S1 to S3 of the Hall ICs 41 to 43 change.

  Thus, the combinations of the types of the output signals S1 to S3 of the Hall ICs 41 to 43 are different depending on the slide movement position of the movable member 20. Therefore, the slide movement position of the manual valve 11 can be detected based on the combination of the types of the output signals S1 to S3. As a result, which range is selected as the shift range of the automatic transmission, and which It can be determined whether switching to the range is in progress.

  For example, when the slide movement position of the movable member 20 is the position shown in FIG. 4A, the types of the output signals S1 to S3 are H, L, and L, respectively, so that the map of FIG. Based on this, it is detected that the shift range is the parking range P. Similarly, when the slide movement position of the movable member 20 is the position shown in FIGS. 4B, 4C, and 4D, it is detected that they are the back travel range R, the neutral range N, and the travel range D, respectively. Is done.

FIG. 5 is a block diagram showing a circuit on the board 40 and a computer 60 outside the board 40. When the above-described output signals S1 to S3 are output from the Hall ICs 41 to 43, they are input to the input processing circuit 61 of the computer 60 through the terminal 46. Then, the computer 60 compares the combination of the types of the output signals S1 to S3 with the map of FIG. 3C stored in advance, to which range the shift range of the automatic transmission is selected, and It is determined which range is being switched to.
The capacitor 44 is an electronic component for protecting the Hall ICs 41 to 43 from a voltage surge that occurs when the power is turned on. The resistor 45 is an electronic component for preventing external noise generated from a power source or the like from entering the Hall ICs 41 to 43.

  As described above, according to the present embodiment, only the Hall ICs 41 to 43 are mounted on the surface of the substrate 40 on the sliding wall portion 31 side, and the capacitor 44 and the resistor 45 are mounted on the opposite surface. Therefore, the shape of the concave portion 31a formed in the sliding wall 31 is deep in the portion facing the Hall ICs 41 to 43, and shallow in the portion of the substrate 40 facing the non-mounted portion where the Hall ICs 41 to 43 are not mounted. The shape can be. In other words, as shown in FIGS. 1A and 1B, a groove 31b having a shape similar to the shape of the Hall ICs 41 to 43 is formed on the bottom surface of the recess 31a, and only the Hall ICs 41 to 43 are accommodated in the groove 31b. You can do that.

  That is, the thickness t1 of the portion facing the Hall ICs 41 to 43 in the sliding wall portion 31 is formed thin, and the thickness t2 of the portion facing the non-mounting portion of the substrate 40 is compared with the thickness t1. It is formed thick. Further, ribs 311 (see FIG. 1B) positioned between the plurality of Hall ICs 41 to 43 are integrally formed on the sliding wall portion 31 with resin. Therefore, the rib 311 portion also corresponds to the wall thickness t2 and is formed thick.

  Therefore, according to this embodiment, since the thick part of the sliding wall part 31 can be increased, the deformation | transformation of the sliding wall part 31 resulting from the shrinkage | contraction of the resin sealing material 50 can be suppressed. And since the location which opposes Hall IC41-43 among the sliding wall parts 31 becomes thin, it can suppress that the space | interval of Hall IC41-43 and the magnets 51-53 becomes large, and the magnetic detection of Hall IC41-43 It can suppress that accuracy and by extension, range detection accuracy fall.

FIG. 6 is an enlarged view of the portion indicated by reference numeral 6 in FIG. 3, and shows that the detection accuracy is improved when the interval is reduced.
More specifically, the horizontal axis of FIG. 6 indicates the slide movement position of the movable member 20, and the vertical axis indicates the level of detection level (magnetic strength) detected by the Hall IC 41. The solid line in FIG. 6 indicates the detection value of the Hall IC 41 in the case of the present embodiment. When this detection value becomes larger on the N pole side than the ON point in FIG. When the signal is output and becomes larger on the S pole side than the off point in FIG. 6, the above-described low level signal is output.

Since the maximum detection value decreases as the interval increases, the change gradient of the detection value becomes gradual. As a result, the section ΔS in which neither the high level signal nor the low level signal can be output becomes long. The magnetic detection accuracy of 43 is lowered. This is shown in the test results of FIG.
As described above, according to the present embodiment, it is possible to achieve both a smooth slide movement of the movable member 20 and a suppression of a decrease in range detection accuracy.

  Furthermore, according to this embodiment, since the terminal 46 is inserted and mounted on the surface of the substrate 40 opposite to the sliding wall portion 31, the terminal 46 is mounted on the surface of the substrate 40 on the sliding wall portion 31 side. Compared with the case where the terminal 46 is mounted, the thick part of the sliding wall part 31 can be increased.

(Other embodiments)
In the above-described embodiment, the capacitor 44 and the resistor 45 are surface-mounted, but insertion mounting in which soldering is performed on the surface on the sliding wall portion 31 side may be used.
Moreover, in the said embodiment, although the rib 311 located between several Hall IC41-43 is formed in the sliding wall part 31, and only the number of Hall IC41-43, the groove part 31b is formed, this invention. In carrying out the above, the rib 311 may be eliminated to form one groove 31b, and the plurality of Hall ICs 41 to 43 may be accommodated in the single groove 31b.
As described above, the present invention is not limited to the above-described embodiment, and can be applied to various embodiments without departing from the gist thereof.

It is a schematic diagram which shows the range detection apparatus which concerns on one Embodiment of this invention, (A) is sectional drawing, (B) is BB sectional drawing of (A), (C) is a board | substrate from the magnet surface side from the front FIG. 4D is a rear view of the substrate as viewed from the opposite side of the magnet. It is a disassembled perspective view which shows the attachment position to the hydraulic control apparatus 10 of the range detection apparatus of FIG. It is a figure which shows the positional relationship of several Hall IC shown in FIG. 1, and several magnets. It is a schematic diagram which shows the slide movement position of the movable member of FIG. It is a block diagram which shows the circuit on the board | substrate of FIG. 1, and the computer outside a board | substrate. It is the enlarged view to which the part shown by the code | symbol 6 in FIG. 3 was expanded. It is a schematic diagram which shows the conventional range detection apparatus, (A) is sectional drawing, (B) is BB sectional drawing of (A), (C) is a front view from a magnet surface side, (D) is a front view. It is the rear view which looked at the board | substrate from the opposite side of the magnet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Hydraulic control apparatus, 11: Manual valve (hydraulic switching valve), 20: Movable member, 30: Fixed member, 31a: Recessed part, 31: Sliding wall part, 31b: Groove part , 311: Rib, 40: Board | substrate, 41 , 42, 43: Hall IC (magnetic detection element), 44: capacitor (other electronic components), 45: resistance (other electronic components), 50: resin sealing material, 51: magnet.

Claims (5)

A range detection device that is attached to a hydraulic control device that switches a shift stage of an automatic transmission and detects which range the shift stage is selected.
A plate-shaped movable member that is provided in the hydraulic control device and works in conjunction with a hydraulic pressure switching valve that switches the gear position;
A plurality of magnets attached to the plate surface of the movable member;
A resin-made fixing member that supports the movable member so as to be slidable, and has a sliding wall portion facing a plate surface of the movable member;
A substrate on which a plurality of magnetic detection elements and other electronic components are mounted which are disposed in a recess formed on the surface of the sliding wall portion opposite to the movable member and detect magnetism by the magnet;
A resin sealing material that fills the recess and seals the substrate;
With
The other electronic component is mounted on the surface of the substrate opposite to the sliding wall,
The plurality of magnetic detection elements are mounted on a surface of the substrate on the side of the sliding wall portion ,
The range detecting device, wherein the plurality of magnetic detection elements are provided in a bottom surface of the concave portion of the sliding wall portion and are accommodated in a groove portion having a shape corresponding to the shape of the plurality of magnetic detection elements . The movable member having a plate shape is formed such that a length orthogonal to the slide movement direction is shorter than a length in the slide movement direction,
The range detection apparatus according to claim 1, wherein the plurality of magnetic detection elements are arranged side by side in a direction orthogonal to the direction of the slide movement.   The range detection device according to claim 1, wherein the magnetic detection element is a Hall IC.   4. The other electronic component is at least one of a capacitor that protects the magnetic detection element from a voltage surge and a resistor that prevents external noise from being mixed into an electronic circuit including the magnetic detection element. The range detection device according to any one of the above. The range detection according to any one of claims 1 to 4 , wherein a rib that is positioned between the plurality of magnetic detection elements and that separates the groove portions from each other is integrally formed of resin on the sliding wall portion. apparatus.

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