JP2017166642A - Hydraulic sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachment structure of a hydraulic sensor which enables accurate pressure detection without exerting harmful effect on a pressure detection element in the hydraulic sensor.SOLUTION: A sensor housing comprises: a lower case 31; and an upper case 32 fixed to an upper side of the lower case 31. A valve body includes: an upper body 1 including a hole 4 which houses the sensor housing; and a lower body 2 provided with an oil passage. A pressed part 7 is provided at the lower case 31. The pressed part 7 faces the upper case 32 and protrudes in a lateral direction of the lower case 31. The pressed part 7 is pressed downward by the upper body 1 through a bracket 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a mounting structure of a hydraulic sensor suitable for use as, for example, a control valve of an automobile transmission.

  A control valve for controlling a speed change mechanism is provided in an automatic transmission of a vehicle. The control valve controls the transmission mechanism by supplying and stopping a predetermined amount of hydraulic pressure to the transmission mechanism using an electromagnetic valve device. As shown in Patent Document 1 to Patent Document 3, there is known a conventional control valve including a valve body formed by superposing an upper body and a lower body. An oil passage through which hydraulic oil flows is formed in the valve body, and an electromagnetic valve device for switching the oil pressure and a sensor for detecting the oil pressure in the oil passage are provided.

  In conventional control valves, most electronic devices such as sensors are individually mounted on the valve body. In recent years, a built-in structure in which an electronic component is sandwiched between an upper body and a lower body is required due to a demand for miniaturization.

JP 2010-174991 A Special table 2010-058800 JP 2011-134801 A

  In the prior art as described above, since the hydraulic sensor is pressed and fixed by the upper body, an unnecessary pressing force is applied to the pressure detection element inside the hydraulic sensor, and an accurate pressure cannot be detected. Structures such as a hydraulic pressure sensor and a pressure detection element inside the hydraulic sensor may be destroyed by the pressing force from the upper body. In order to eliminate such an inconvenience, it is conceivable to improve the strength of the case of the hydraulic sensor. However, in this case, there arises a problem in that the case is increased in size and required materials are increased.

  It is an object of the present invention to provide a hydraulic sensor mounting structure that enables accurate pressure detection without adversely affecting the pressure detection element inside the hydraulic sensor.

The hydraulic sensor mounting structure of the present invention is characterized by having the following configuration.
(1) A sensor housing formed by fixing a lower case and an upper case above the lower case.
(2) A valve body including an upper body having a hole for housing the sensor housing, and a lower body in which an oil passage is provided upward toward the upper body.
(3) An oil introduction space provided in the lower case, having one end opened to the oil passage and the other end closed with a flexible plate that deforms in response to oil pressure.
(4) A pressure detection element provided in the upper case and provided on the opposite side of the oil introduction space in the flexible plate.
(5) A pressure detection space provided in the upper case and surrounding the upper surface side of the flexible plate.
(6) A pressed part that is provided in the lower case, protrudes in the lateral direction of the lower case so as to face the upper case, and is pressed downward by the upper body.

In the present invention, the following configuration is preferable.
(1) The upper body includes a bracket that presses the pressed portion downward in the hole.
(2) The bracket is a cylindrical member that houses the sensor casing therein.
(3) The pressed portion is pressed downward by a step provided on the inner surface of the hole of the upper body.
(4) A plate-like spacer is provided between the upper body and the lower body, a hole for inserting the sensor housing is provided in the spacer, and a step provided on an edge of the hole of the spacer It is in contact with the pressed part of the lower case.
(5) The hole provided in the upper body penetrates from the lower surface of the upper body to the upper surface, and the upper part of the sensor housing housed in the hole projects from the upper surface of the upper body.
(6) The pressed portion is a flange portion protruding around the lower case.
(7) A recess for accommodating the lower part of the lower case and the pressed part is formed on the surface of the lower body, and the surface of the pressed part is positioned flush with the surface of the lower body.

  According to the present invention, since the hydraulic sensor is fixed between the upper body and the lower body by pressing the pressed portion provided in the lower case of the hydraulic sensor with the upper body, the hydraulic sensor and the pressure detection inside thereof are detected. No pressing force is applied to the element. As a result, even if a large force is applied when the hydraulic sensor is sandwiched between the upper body and the lower body, there is no risk of deformation or breakage of the hydraulic sensor or the pressure detection element, and accurate pressure detection is possible.

FIG. 1 is a longitudinal sectional view of the first embodiment. FIG. 2 is a longitudinal sectional view of the second embodiment. FIG. 3 is a perspective view in which a part of the upper body of the second embodiment is cut away. FIG. 4 is a longitudinal sectional view of the third embodiment. FIG. 5 is a longitudinal sectional view of the fourth embodiment. FIG. 6 is a longitudinal sectional view of the fifth embodiment. FIG. 7 is a longitudinal sectional view of the sixth embodiment.

[1. First Embodiment]
[1.1 Configuration]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In this embodiment, the axis refers to the central axis along the vertical direction of the hydraulic sensor, and simply referring to the circumferential direction or the axial direction indicates the circumferential direction of the central axis or the axial direction of the central axis.

  FIG. 1 is a longitudinal sectional view of this embodiment. The valve body is composed of an upper body 1 and a lower body 2, and a hole 4 for accommodating the hydraulic sensor 3 is provided on the lower surface of the upper body 1. The lower body 2 is provided with an oil passage 5 above the upper body 1, and the hydraulic sensor 3 is fixed to the opening of the oil passage 5.

  The hydraulic sensor 3 has a lower case 31 and an upper case 32 fixed above the lower case 31. The lower case 31 and the upper case 32 correspond to the sensor casing of the present invention. The lower case 31 is provided with an oil introduction space 34 whose one end opens to the oil passage 5 and whose other end is closed by a flexible plate 33 that deforms according to the pressure of the oil. A groove 35 that is recessed upward from the lower surface of the lower case 31 is provided on the outer side in the circumferential direction of the oil passage 5 in the lower case 31. A sealing material 35 a such as an O-ring is fitted in the groove 35. The contact surface between the lower case 31 and the lower body 2 is sealed with a sealing material 35a.

  The upper case 32 is provided with a pressure detection space 36 surrounding the upper surface side of the flexible plate 33. A support member 37 whose periphery is fixed to the upper case 32 is provided in the pressure detection space 36, and a pressure detection element 38 is provided on the lower surface of the support member 37. The pressure detection element 38 is provided on the opposite side of the oil introduction space 34 in the flexible plate 33. When the flexible plate 33 is deformed by the hydraulic pressure from the oil passage 5, the flexible plate 33 contacts the pressure detecting element 38. The upper case 32 is provided with a springy terminal pin 39 connected to the pressure detecting element 38, and the terminal pin 39 is connected to the printed wiring board 6 provided in the hole 4.

  The outer periphery of the lower case 31 projects outward in the circumferential direction from the outer periphery of the upper case 32, that is, in the lateral direction in the figure. The upper surface of the protruding portion is the pressed portion 7 in the present invention. In the present embodiment, the projecting portion that becomes the pressed portion 7 projects in a flange shape around the entire periphery of the lower case 31. A bracket 8 is provided on the outer side in the circumferential direction of the upper case 32. The bracket 8 includes a plurality of legs 81 arranged at equal intervals in a cylindrical shape on the outer periphery of the upper case 32 and a top plate 82 supported by the legs 81. The top plate 82 contacts the ceiling portion of the hole 4, and the lower end of the leg 81 contacts the surface of the pressed portion 7. The leg 81 may be a single cylindrical member having no opening or a part of the cylindrical member provided with an opening or a notch as long as the leg 81 is disposed in a cylindrical shape around the hydraulic sensor 3. The top plate 82 may be a single flat plate without an opening or may be closed.

  The pressing force of the upper body 1 is transmitted to the lower case 31 in the order of the ceiling of the hole portion 4 → the top plate 82 → the leg 81 → the pressed portion 7. The lower case 31 is pressed against the surface of the lower body 2 by the pressing force of the upper body 1, and the lower case 31 is fixed in the hole 4. Although the pressing force of the upper body 1 is not directly applied to the upper case 32, since the upper case 32 and the lower case 31 are fixed, the upper case 32 is also fixed in the hole 4.

[1.2 Effects]
The operational effects of the first embodiment having the above-described configuration are as follows.
(1) The place where the hydraulic sensor 3 is pressed by the upper body 1 is not the upper case 32 holding the pressure detection element 38 but the lower case 31 side including the oil introduction space 34. Thus, the pressing force applied to the hydraulic sensor 3 does not adversely affect the members such as the pressure detection element 38, the printed wiring board, and the wiring, and accurate pressure detection by the hydraulic sensor 3 becomes possible.

(2) Since the lower case 31 is directly pressed by the bracket 8, the lower case 31 is effectively pressed by the lower body 2 with a stronger pressing force than when the lower case 31 is pressed from the bracket 8 via the upper case 32. It can be adhered to the surface. As a result, the sealing performance between the lower case 31 to which the hydraulic pressure from the oil passage 5 is applied and the lower body 2 can be improved.

(3) By changing the bracket 8, the hydraulic sensor 3 having various shapes and dimensions can be incorporated between the upper body 1 and the lower body 2 without changing the shapes of the upper body 1 and the lower body 2. Become. Since the shape of the hole 4 may be the same as that of the prior art that holds the upper case 32 by the upper body 1, there is an advantage that the conventional valve body can be diverted as it is.

(4) Since the bracket 8 in which the plurality of legs 81 are arranged in a cylindrical shape at equal intervals is used, the pressing force can be transmitted evenly to the entire periphery of the lower case 31 and the hydraulic sensor 3 can be fixed securely. The cylindrical bracket 8 also has a role of protecting the hydraulic sensor 3, and the impact resistance and reliability are improved.

(5) Since the pressed portion 7 projects in a flange shape around the entire periphery of the lower case 31, the pressing force of the upper body 1 can be received with a wide area of the flange, so that the lower case 31 can be fixed securely.

[2. Second Embodiment]
A second embodiment will be described with reference to FIGS. In this embodiment, the lower case 31 is fixed by directly pressing the lower case 31 only with the upper body 1 without using other members such as the bracket 8.

  In the upper part of the hole 4 of the upper body 1, the inner diameter of the hole 4 is substantially equal to the outer diameter of the upper case 32 and smaller than the outer diameter of the lower case 31. At the lower part of the hole part 4, the inner diameter of the hole part 4 is substantially equal to the outer diameter of the lower case 31. Therefore, a step portion 41 is formed over the entire inner peripheral surface of the hole portion 4 at a position facing the pressed portion 7 of the lower case 31 in the hole portion 4. The lower surface of the step portion 41 hits the pressed portion 7, and the pressing force of the upper body 1 is transmitted to the lower case 31 in the order of the step portion 41 → the pressed portion 7, and the lower case 31 is pressed against the surface of the lower body 2. .

  A concave portion 32a having an upper surface opened is provided on the upper portion of the upper case 32, and the terminal pin 39 projects into the concave portion 32a. The printed wiring board 6 is provided in the recess 32a, and the terminal pins 39 are connected to the printed wiring board 6. Filler 9 such as resin is injected into the recess 32 a and solidified, and the terminal pins 39 and the printed wiring board 6 are insulated by the filler 9.

  In the second embodiment, the pressed portion 7 is pressed downward by the step portion 41 provided on the inner surface of the hole portion 4 of the upper body 1, so that the hydraulic sensor 3 is connected to the hole portion without preparing a separate bracket. 4 can be fixed. As a result, the structure can be simplified and the number of parts can be reduced. Since the inner diameter of the hole 4 is substantially equal to the outer diameter of the lower case 31 at the lower part of the hole 4, it is possible to position the lower case 31 in the hole 4 in the lateral direction. Positioning accuracy with the space 34 is also improved.

[3. Third Embodiment]
A third embodiment will be described with reference to FIG. In this embodiment, a plate-like spacer 10 is provided between the upper body 1 and the lower body 2, a hole 11 for inserting the hydraulic sensor 3 is provided in the spacer 10, and provided at the edge of the hole 11 of the spacer 10. The stepped portion 12 is in contact with the pressed portion 7 of the lower case 31. The spacer 10 is a plate-like or block-like member sandwiched between the upper body 1 and the lower body 2 of the valve body, and various shapes can be used. In this embodiment, what is generally called a separate plate is used as the spacer 10.

  According to the third embodiment, in addition to the same effects as those of the second embodiment, there is an advantage that the present invention can be applied only by preparing the spacer 10 without changing the upper body 1 itself.

[4. Fourth Embodiment]
A fourth embodiment will be described with reference to FIG. In the present embodiment, the hole 4 provided in the upper body 1 penetrates the upper body 1. The upper case 32 of the hydraulic sensor 3 protrudes from the upper surface of the upper body 1. Other configurations are the same as those of the second embodiment.

  According to the third embodiment, since the hydraulic sensor 3 is exposed on the upper surface of the upper body 1 in addition to the same effects as the second embodiment, wiring to the terminal pins 39 is facilitated. Compared to the configuration in which the valve body is preliminarily wired at a narrow portion in the hole 4 before the valve body is assembled, the hydraulic sensor 3 can be wired after the valve body is assembled. It can be done and the degree of freedom of the wiring pattern is high.

[5. Fifth Embodiment]
A fifth embodiment will be described with reference to FIG. A plate-like spacer 10 is provided between the upper body 1 and the lower body 2, a hole 11 for inserting the hydraulic sensor 3 is provided in the spacer 10, and a step portion 12 provided at the edge of the hole 11 of the spacer 10. Is in contact with the pressed portion 7 of the lower case 31. Other configurations are the same as those of the fourth embodiment.

  According to the fifth embodiment, there is an advantage that the present invention can be applied only by preparing the spacer 10 without changing the upper body 1 itself, in addition to the same effects as the fourth embodiment.

[6. Sixth Embodiment]
A sixth embodiment will be described with reference to FIG. In the present embodiment, a recess 21 in which the lower part of the lower case 31 and the pressed part 7 are accommodated is formed on the outer side in the circumferential direction of the oil passage 5 in the lower body 2. The surface of the pressed part 7 is located on the same plane as the surface of the lower body 2. The edge of the hole 4 of the upper body 1 hits the surface of the pressed part 7, and the lower case 31 is pressed by the upper body 1.

  According to the sixth embodiment, in addition to the same effects as those of the second embodiment, there is an advantage that the upper body 1 can be held as it is by the edge of the hole 4 of the upper body 1 without providing the step 41. . Since the hydraulic sensor 3 is also positioned in the concave portion 21 of the lower body 2, there is an effect that there is no backlash in the horizontal direction.

[7. Other Embodiments]
The present invention is not limited to the above embodiment. The above embodiments are presented as examples, and can be implemented in various other forms. Various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope, gist and equivalent range of the invention. An example is shown below.

(1) In the first embodiment, the upper portion of the bracket 8 may contact the ceiling of the hole 4 of the upper body 1 as shown in FIG. May be provided so as to contact the upper portion of the bracket 8.

(2) As the oil introduction space 31 provided in the lower case 31, one end side opens into the oil passage 5, and the other end side is an oil introduction space 31 closed by a flexible plate 33 that deforms according to the oil pressure. As long as it communicates, in addition to the one extending vertically as shown in the figure, one end may be upward, bent at an intermediate point, and the other end may be lateral.

(3) The pressed portion 7 provided in the lower case 31 does not need to be provided in a flange shape around the entire lower case 31. Protruding portions can be provided around the lower case 31 at equal intervals or at appropriate intervals, and the upper surface thereof can be used as the pressed portion 7.

(4) In the second embodiment, as the stepped portion 41, a stepped portion is formed by cutting out part of the inner surface of the hole portion 4, or a protrusion that engages with the lower case 31 is provided on the inner surface of the hole portion 4. In addition, a projection having a stepped bottom surface can be used.

DESCRIPTION OF SYMBOLS 1 ... Upper body, 2 ... Lower body, 3 ... Hydraulic sensor, 4 ... Hole part, 5 ... Oil path, 6 ... Printed wiring board, 7 ... Pressed part, 8 ... Bracket, 9 ... Filler, 10 ... Spacer, DESCRIPTION OF SYMBOLS 11 ... Hole, 12 ... Step part, 21 ... Recessed part, 31 ... Lower case, 32 ... Upper case, 33 ... Flexible plate, 34 ... Oil introduction space, 35 ... Groove, 35a ... Sealing material, 36 ... Pressure detection space, 37: support member, 38: pressure detecting element, 39: terminal pin, 41: stepped portion, 81: leg, 82: top plate.

Claims (8)

A sensor case in which an upper case is fixed above the lower case and the lower case;
A valve body including an upper body having a hole for accommodating the sensor housing, and a lower body in which an oil passage is provided toward the upper body;
In the hydraulic sensor mounting structure with
An oil introduction space provided in the lower case, having one end opened to the oil passage and the other end closed by a flexible plate that deforms in response to the pressure of the oil;
A pressure detecting element provided in the upper case and provided on the opposite side of the oil introduction space in the flexible plate;
A pressure detection space provided in the upper case and surrounding the upper surface side of the flexible plate;
Provided in the lower case, protrudes in the lateral direction of the lower case so as to face the upper case, and is pressed downward by the upper body;
Hydraulic sensor mounting structure characterized by having   The hydraulic sensor mounting structure according to claim 1, wherein the upper body includes a bracket that presses the pressed portion downward in a hole portion thereof.   The hydraulic sensor mounting structure according to claim 2, wherein the bracket is a cylindrical member that houses the sensor housing therein.   The hydraulic sensor mounting structure according to claim 1, wherein the pressed portion is pressed downward by a step portion provided on an inner surface of the hole of the upper body. A plate-like spacer is provided between the upper body and the lower body, and a hole for inserting the sensor housing is provided in the spacer.
The hydraulic sensor mounting structure according to claim 1, wherein a step portion provided at an edge of the hole of the spacer is in contact with a pressed portion of the lower case. The hole provided in the upper body penetrates from the lower surface to the upper surface of the upper body,
The hydraulic sensor mounting structure according to any one of claims 1 to 5, wherein an upper portion of the sensor casing housed in the hole projects from an upper surface of the upper body.   The hydraulic sensor mounting structure according to any one of claims 1 to 6, wherein the pressed portion is a flange portion protruding around the lower case. On the surface of the lower body, a lower portion of the lower case and a recessed portion that accommodates the pressed portion are formed,
The hydraulic sensor mounting structure according to any one of claims 1 to 4, wherein a surface of the pressed portion is located on the same plane as a surface of the lower body.

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