JPH0690102B2 - Oil pressure detector - Google Patents

Description

TECHNICAL FIELD The present invention is preferably implemented to detect the pressure of pressure oil fed from a lubricating oil pump mounted in association with, for example, an automobile engine. The present invention relates to a hydraulic pressure detection device.

BACKGROUND ART FIG. 9 is a perspective view showing a structure which is a premise of the present invention.

For example, an automobile is equipped with a detection device 1 for detecting the pressure of lubricating oil that is pumped from a hydraulic pump.
The detection device 1 is provided with a shaft member 4 which is rotatably supported by a bearing 3 formed on one side of the support member 2.
The shaft member 4 has a support portion 5 extending in a straight line, and bent portions 6 and 7 connected to both end portions of the support portion 5. Support part 5
Is rotatably supported by the bearing 3 so as to be angularly displaceable around its axis. A coil spring 8 is attached to the support portion 5. One end of the coil spring 8 is locked to the bent portion 6, and the other end is locked to the support member 2. As a result, the shaft member 4 is spring-biased around the axis of the support portion 5 in the arrow A1 direction. A substantially U-shaped contact portion 9 is formed on the bent portion 7.

The support member 2 has a wiring board 10 having a configuration not shown.
And the electric resistor 11 are fixed. The wiring board 10 is
An insulating plate (12) made of an electrically insulating material and a wiring layer (13) made of copper foil or the like formed on one surface of the insulating plate (12). The resistor 11 includes a support plate 14 made of an electrically insulating material and a support plate 14.
14 and a resistance wire 15 wound at equal intervals. Contacts 17a, 17b of a brush 16 made of copper, which is fixed to the tip of the bent portion 6 by soldering or the like, elastically abuts on the wiring layer 13 and the resistance wire 15 to electrically contact them.

The protrusion 19 extending from the diaphragm built in the actuator 18 is displaced by the pressure oil from the hydraulic pump being supplied to the actuator 18, and the end face 21 is in contact with the tip 20 of the contact portion 9 when the end face 21 is in contact with the arrow. Move up and down in the direction of the marks B1 and B2.
When the hydraulic pressure supplied to the actuator 18 drops, the protrusion
19 displaces in the B1 direction, and displaces in the B2 direction when the hydraulic pressure rises. Therefore, when the protrusion 19 is displaced in the arrow B1 direction,
Due to the spring force of the coil spring 8, the shaft member 4 is angularly displaced in the direction of arrow A1 with the tip 20 in contact with the end surface 21. When the protrusion 19 is displaced in the arrow B2 direction, the bent portion 7 is pushed up and the shaft member 4 is angularly displaced in the arrow A2 direction against the spring force of the coil spring 8. By such an angular displacement operation of the shaft member 4, the contact point 23 and the wiring layer 13 to which one ends of the resistance wires 15 provided on the wiring board 10 and the resistor 11 are connected, respectively.
It is configured so that the resistance value between the contact 22 and the contact 22 can be changed.

With the above configuration, in the shaft member 4, the contact points 17a of the brush 16,
Since the relative distance between 17b and the tip 20 of the bent portion 7 cannot be changed, therefore, when the power source 24 supplies power to the contact 23, the protrusion 19 corresponds to the displacement in the arrow B1 and B2 directions. The resistance value between the contacts 22 and 23 cannot be changed. Therefore, the voltage between the contacts 22 and 23 cannot be finely adjusted to a desired value. Further, since the shaft member 4 has a relatively complicated structure, the machining thereof is complicated and the productivity is low.

An object of the present invention is to provide a hydraulic pressure detection device capable of detecting hydraulic pressure with a simple structure.

Means for Solving the Problems The present invention provides (a) a diaphragm 50 and (b) a pressure oil, and together with the diaphragm 50,
A lid 55 that forms a diaphragm chamber 56, (c) a protrusion 57 that is fixed to the diaphragm 50 so as to project to the side opposite to the diaphragm chamber 56, and (d) a support member 41 made of a metal plate, (D1) First insertion hole 44a fixed to the lid 55 and facing the protrusion 57
And a mounting portion 42 having (d2) is bent to one side portion of the mounting portion 42 to be integrally connected, and extends parallel to the axial direction of the protrusion 57 so as to move away from the protrusion 57, and is formed so as to rise. Second insertion hole connected to the first insertion hole 4a
A rising portion 43 having 44b, and (d3) at the other end of the mounting portion 42 at the peripheral edge of the first insertion hole 44a.
The first bracket 45 which is erected so as to face the rising portion 43, and (d4) the mounting portion 42 at the rising portion 43 at the peripheral edge of the second insertion hole 44b.
Formed on the opposite side (upward in FIG. 2) from the
A support member 41 having a second bracket 46 facing the bracket 45, and (e) a shaft member 34 made of a single wire rod, (e1) a first bracket rotatably supported by the first bracket 45. The shaft portion 34d and (e2) a second shaft portion 34e which is rotatably supported by the second bracket 46 and has an axis line on the same straight line as the axis line of the first shaft portion 34d.
And (e3) is bent in a V shape between the first and second shaft portions 34d, 34e to be on one side of the axis (right side of FIG. 1, left side of FIG. 2, and FIG. 6). (E4) the fitting portion 82 formed so as to project upward, and (e4) the rising portion 4 with respect to the second bracket 46 of the second shaft portion 34e.
The rising piece 34f rising from the end 34c (upper side in FIG. 2) that has gone away from 3 and (e5) is connected to the end of the rising piece 34f and is separated from the rising portion 43 by a distance d.
A shaft member 34 having a projecting piece 34g extending toward the rising portion 43 with a gap of 1, and (f) a fitting portion 82 rather than the first bracket 45 of the first shaft portion 34d.
The withdrawal prevention piece 88 fixed to the opposite side, (g) the base 31 that is fitted and fixed in the fitting portion 82, and is arranged on the one side, and (h) screwed into the base 31. , An adjusting screw rod 33 whose end contacts the end face of the protrusion 57, and (i) an adjusting screw rod 33 which is connected to the mounting portion 42 and the base 31.
A spring 104 that applies a spring force to the end face of the protrusion 57 at the end of the brush, and (j) a brush 37 that is made of a metal plate and is provided so as to face the rising portion 43. The brush main body 67 has a substantially U-shaped insertion hole 69, and the brush main body 67 has a substantially U-shaped insertion hole 69 in the same direction as the one side of the fitting portion 82 (right side in FIG. 1). The left side of FIG. 2 and the upper side of FIG. 6), a mounting piece 70 is formed so as to project.
The free end portion 34a of the protruding piece 34g is fixed almost vertically to the surface of the mounting piece 70 opposite to the rising portion 43 (on the right side in FIG. 6), and the first contact point 71 protruding toward the rising portion 43 is formed. Adjustment screw rod 33
A brush main body 67 further away from the second shaft portion 34e to the one side, and (j2) a brush main body 67 from the second shaft portion 34e than the adjustment screw rod 33 to the one side. And a projecting piece 68 projecting along the rising portion 43, the projecting piece 68 having the second contact point 72 provided on the projecting piece 68 so as to project toward the rising portion 43. The electric resistance means 38 fixed to the brush 37 and the (k) rising part 43 opposite to the mounting part 42 and extending along the moving direction of the first contact 71 and abutting the first contact 71 elastically. And (1) a wiring board 75 fixed to the opposite side of the mounting portion 42 of the rising portion 43, extending along the moving direction of the second contact 72 and contacting the second contact 72 elastically. Substrate with layer 76 formed
And (m) changing the electric resistance value between the one end of the electric resistance means 38 and the wiring layer 76.

Action According to the present invention, the diaphragm 50 is displaced according to the hydraulic pressure in the diaphragm chamber 56, and accordingly the screw rod 33 which is in contact with the protrusion 57 and the base 31 to which this screw rod 33 is screwed are displaced, and Accordingly, the shaft member 34 is configured so that the first and second shaft portions 34b, 34
The brush 37 is displaced in accordance with the angular displacement about the axis line of e, and the first and second contacts 71 and 72 thereof are elastically abutted along the electric resistance means 38 and the wiring layer 76. While being displaced, the electric resistance value between the one end portion of the electric resistance means 38 and the wiring layer 76 is obtained corresponding to the hydraulic pressure.

Embodiment FIG. 1 is a side view showing a pressure detecting device 30 of an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is an exploded perspective view thereof. In addition, in FIG.
Are cut out for ease of illustration. The pressure detection device 30 and a synthetic resin base 31 are screwed onto the base 31, and the displacement of the base 31 can be adjusted in the thickness direction of the base 31, and an adjustment screw rod whose one end in the axial direction abuts on the detected body 32. 33, a shaft member 34 fixed to the base 31 and projecting outwardly on both sides of the base 31 with a straight line located at a position deviated from the axis of the adjusting screw rod 33 as an axis, and the shaft member 34 at an angle around the axis. It includes a displaceable support means 35 and a means 36 for converting the angular displacement amount of the shaft member 34 into an electric signal. The conversion unit 36 includes a brush 37 fixed to the shaft member 34, and an electric resistance detection unit 38 that comes into contact with the brush 37 and detects a change in electric resistance at a contact position with the brush 37.

The base body 31 is formed with a screw hole 40 in which an internal screw is engraved so as to be inserted in the thickness direction thereof. The adjusting screw rod 33 is screwed and inserted into the screw hole 40. A shaft member 34 is attached to the base 31, and the shaft member 34 is attached to the support member 41 via the support means 35 so as to be angularly displaceable around the axis thereof. The support member 41 is made of metal and has a semi-arcuate mounting portion 42 and a rising portion 43 that is bent and integrally connected to one side portion 42a of the mounting portion 42. Such a support member 41 includes
An insertion hole 44 is formed. A bracket 45 projecting to one side in the thickness direction of the mounting portion 42 is formed on one side of the mounting portion 42 facing the insertion hole 44. A bracket 46 is formed on one side of the rising portion 43 facing the insertion hole 44. Such a support member 41 is fixed to the detected body 32.

The detected object 32 is an actuator that drives the diaphragm 50 by hydraulic pressure, for example. The detected body 32 includes a housing 52 in which a plurality of locking claws 51 (see FIG. 2) are formed.
And an inner cylindrical body 53 housed in the housing 52, and an inner cylindrical body 53
Frustum-shaped inner wall 5 protruding inward from the vicinity of the flange 53a of the
4 and a lid 55 that closes the inner wall 54. The diaphragm 50 is housed in a diaphragm chamber 56 defined by the inner peripheral surface of the inner wall 54 and the inner surface of the lid 55. The peripheral edge of the diaphragm 50 is sandwiched between the inner wall 54 and the lid 55. The diaphragm 50 is made of a material having elasticity and airtightness such as rubber. One end of the protrusion 57 is fixed to the diaphragm 50. Protrusion
The other end of 57 is inserted through the insertion hole 58 formed in the inner wall 54,
The inner wall 54 projects to the side opposite to the diaphragm chamber 56. The tip surface 62 of the adjusting screw rod 33, which is inserted through the openings 60 and 61 formed in the housing 52 and the inner cylindrical body 53, comes into contact with the end surface 59 of the protrusion 57.

The lid body 55 includes an end plate 63, a hooking portion 64 provided at a central portion of the end plate 63, and a pipe joint 65 connected to the hooking portion 64. Pipe fitting
An outer screw is engraved on the outer peripheral surface of 65. An insertion hole 66 is formed in the engaging portion 64 and the pipe joint 65, and the insertion hole 66 is opened to face the diaphragm chamber 56. Therefore, connect a pipe extending from a pressure source (not shown) to the pipe joint 65,
When the pressure oil is supplied through the insertion hole 66, the pressure oil flows between the diaphragm 50 and the lid body 55 of the diaphragm chamber 56 and presses the diaphragm 50. As a result, the diaphragm 50 is elastically deformed in the pressing direction, the protrusion 57 is displaced upward in FIG. 1, and the adjusting screw rod 33 is pressed. Therefore, the base 31 can be angularly displaced around the axis of the shaft member 34 to displace the brush 37.

The brush 37 has a brush body 67 and a protrusion 68 integrally formed with the brush body 67. The brush body 67 has an insertion hole.
69 is formed by being inserted in the thickness direction, and a mounting piece 70 is formed on one side facing the insertion hole 69. One end 34a of the shaft member 34 is fixed to the mounting piece 70 by soldering or the like. The shaft member 34 is made of brass, for example, and the brush 37 is made of copper, for example. A contact point 71 is formed on the brush body 67. A contact 72 is formed on the protrusion 68. contact
71 elastically abuts on a resistance wire 74 wound around the support plate 73 constituting the electric resistance means 38 at equal intervals. Further, the contact 72 elastically abuts on a wiring layer 76 made of copper foil or the like formed on the substrate 75 by printing or the like. The wiring layer 76 is
The first region 76a to which the lead wire 77 is connected and the second region 76b electrically isolated from the first region 76a are formed. Also,
The support plate 73 and the substrate 75 are made of an electrically insulating material, and the substrate 75 is fixed to the rising portion 43 by a bolt 78. Therefore, when the contacts 71, 72 of the brush 37 move in contact with the resistance wire 74 and the wiring layer 76, the electric resistance value between the one end portion 74a of the resistance wire 74 and the wiring layer 76 can be changed. Therefore, depending on the amount of displacement of the protrusion 57 described above,
The electrical signal can be changed. Further, when it is desired to change the electric resistance value, fine adjustment is possible by screwing the screw member 33 back and forth.

FIG. 4 is a sectional view of the base 31, and FIG. 5 is a sectional view taken along the section line V-V in FIG. A long groove 80 extending in a straight line is formed on one side of the base 31. Further, in the base 31, a V-shaped recess 81 opened to face the long groove 80.
Is formed. A V-shaped fitting portion of the shaft member 34 is provided in the recess 81.
82 fits in. Angle θ formed by the inner surfaces of the recess 81 facing each other
1 is substantially equal to or slightly smaller than the angle θ2 formed by the fitting portion 82 of the shaft member 34. As a result, it is possible to prevent the fitting portion 82 from frictionally contacting the inner surface of the recess 81 and the base body 31 from being easily separated from the shaft member 34. Further, by fitting the fitting portion 82 in the recess 81, the shaft member is
The shaft member 34 and the base member 31 are not displaced from each other.
It is possible to integrally perform angular displacement about the axis of the. One end of the coil spring 104 is locked by a spring locking projection 105 provided on the base 31 and the other end is locked by a locking claw 106 formed on the mounting portion 42. Thereby, the base 31 is spring-biased so that the tip portion 62 of the adjusting screw rod 33 is always in contact with the end surface 59 of the protrusion 57.

FIG. 6 is a sectional view for explaining the supporting means 35, and FIG. 7 is a front view of the bracket 46. A circular insertion hole 83 is formed in the bracket 45 formed in the mounting portion 42 of the support member 41 so as to be inserted in the thickness direction thereof. A bearing piece 84 is fitted into the insertion hole 83. The bearing piece 84 includes a short cylindrical portion 85 that is inserted into the insertion hole 83 and a flange 86 that is continuous with the short cylindrical portion 85. An insertion hole 87 having an inner diameter slightly larger than the outer diameter of the shaft member 34 is formed in the short cylindrical portion 85. Shaft member
The other end 34b of 34 is inserted through the insertion hole 87 and projects from the surface of the flange 86. A straight cylindrical tubular body 88 is attached to the projecting other end portion 34b and soldered with solder 89. The bearing pieces 84 and the tubular body 88 are made of a metal material such as brass. Therefore, the shaft member 34 is supported by the bearing piece 84 so as to be angularly displaceable around its axis, and the tubular member 88 prevents the shaft member 34 from being pulled out to the right in FIG. With such a configuration, the shaft member 34 is electrically connected to the support member 41.

Further, the bent portion of the shaft member 34 on the side opposite to the end portion 34b, that is, the rising portion 43 with respect to the bracket 46 of the shaft portion 34d.
The vicinity of the end portion 34c far from the shaft is pivotally supported around the axis thereof by a bearing piece 84a inserted into an insertion hole 90 formed in the bracket 46 and mounted. This bearing piece 84a has the same structure as the bearing piece 84,
The subscript a is attached to the corresponding part. These bearing pieces 84,84a
The axes of are in common line. Further, as shown in FIG. 7, the insertion hole 90 is formed in a substantially semi-arcuate jaw 92 connected to the arm 91 of the bracket 46, and is connected to the circular fitting portion 93 and this fitting portion 93. It is composed of a guide section 94. Therefore, the shaft member 34 is inserted along the guide portion 94 and is in a state of being fitted in the fitting portion 93.

FIG. 8 is a sectional view of the vicinity of the mounting hole 95a showing a state in which the electric resistance means 38 is mounted on the rising portion 43 of the support member 41. The rising portion 43 is provided with mounting holes 95a and 95b (see FIG. 3) formed by being inserted in the thickness direction. Further, a pair of mounting holes 96a, 96b are formed in the support plate 73 of the electric resistance means 38 so as to be inserted in the thickness direction thereof. Such electrical resistance means
38 is arranged close to one side surface of the rising portion 43 so that the mounting holes 96a, 96b have the same axis in the mounting holes 95a, 95b. In such a state, between the rising portion 43 and one side surface of the support plate 73 facing the rising portion 43, electrically insulating ring members 97a and 97b made of an annular synthetic resin or the like are interposed. The ring body 97a is formed with an insertion hole 98a inserted in its thickness direction. The tubular portion 100a of the rivet 99a is inserted through the mounting holes 95a, 96a and the insertion hole 98a. Rivet 99a head 101a
Comes into contact with the support plate 73, and the tip end portion 102a of the tubular portion 100a is caulked. As a result, the electric resistance means 38 is attached to the rising portion 43 via the ring body 97a. On the opposite side of the rising portion 43 of the electric resistance means 38, a ring 104a made of an electrically insulative material such as synthetic resin is externally inserted, and an inverted L-shaped metal piece 103a is formed on the tip portion of the ribet 99a. It is fixed by 102a. Resistance wire 74 wound around support plate 73
By connecting the end of the to the head 101a of the ribet 99a, the metal fitting 103a and the resistance wire 74 can be electrically connected. Further, the support plate 73 is attached to the attachment hole 95b by using the rivet 99b in accordance with the same procedure as the above-mentioned attachment hole 95a, and the corresponding portion is attached with the subscript b and its description is omitted.

In the pressure detection device 30 having the above configuration, when pressure oil is supplied to the detected body 32 from the insertion hole 66, the diaphragm 50 is displaced and the protrusion 57 is pushed outward from the insertion hole 58 of the inner wall 54. Then, the adjusting screw rod 33 is pressed. As a result, the base 31 is angularly displaced about the axis of the shaft member 34, and the brush 37 is angularly displaced. Therefore, the contact points 71, 72 of the brush 37 slide while being in contact with the resistance wire 74 and the wiring layer 76, respectively.
When the contact 72 is in contact with the first area, the lead wire 77 and the metal fitting
The other lead wire 79 connected to the rivet 99a via 103a is electrically connected, and the electric resistance value between the lead wires 77 and 79 can be changed. Further, when the contact 72 is in contact with the second region, the lead wires 77 and 79 are cut off from each other.
Therefore, as the protrusion 57 rises in the direction of arrow B2, the contact point
72 moves from the first area 76a to the second area 76b, and is switched to the OFF state while reducing the resistance value between the lead wires 77 and 79. When performing the fine adjustment by changing the minimum electric resistance value in the first region 76a, the amount of protrusion of the adjusting screw rod 33 from the lower surface of the base 31 is adjusted by using a driver or the like, and It is possible to set the resistance value to a desired value.

The configuration will be further described. Oil pressure detection device in this embodiment
At 30, the protrusion 57 is fixed to the diaphragm 52 so as to project to the side opposite to the diaphragm chamber 56 (upper side in FIG. 1).

The support member 41 is made of metal as described above, is made of a plate as apparent from FIG. 3, and basically has a mounting portion 42, a rising portion 43, and brackets 45 and 46. Mounting part 42
Has a first insertion hole 44a fixed to the lid body 55 and facing the protrusion 57. The rising portion 43 is bent to one side of the mounting portion 42 to be integrally connected, and is formed so as to rise away from the protrusion 57, that is, extend upward in FIGS. 1 and 3.
In the rising portion 43, an insertion hole 44b continuous with the insertion hole 44a is formed. The two insertion holes 44a and 44b are generally indicated by the reference numeral 44 as described above. The bracket 45 has an insertion hole
At the peripheral edge of 44a, it is erected at the other end of the mounting portion 42 so as to face the rising portion 43. The other bracket 46 has an insertion hole 44b.
It is formed on the rising portion 43 at the peripheral edge of the above so as to project to the side opposite to the mounting portion 42 (upward in FIG. 2).

The shaft member 34 is composed of a single wire, and basically, the shaft portion 34
It has d, 34e, a fitting portion 82, a rising piece 34f, and a protruding piece 34g. The shaft portion 34d is rotatably supported by the bracket 45. The shaft portion 34e is rotatably supported by the bracket 46,
It has an axis which is collinear with the axis of the shaft portion 34d, which is especially clear from FIG. The fitting portion 82 is formed by the shaft portions 34d, 34.
It is bent in a V-shape between e and one side of the axis (first
It is formed so as to project rightward in the figure, leftward in FIG. 2, and upward in FIG. The rising piece 34f rises from the upper end 34c in FIG. 2 which is farther from the rising portion 43 than the bracket 46 of the shaft portion 34e. The projecting piece 34g is continuous with the end of the rising piece 34f and is spaced apart from the rising piece 43 by a space d1 (see FIG. 2).
Once extends to.

The tubular body 88, which is a pull-out prevention piece, is provided in the bracket 4 of the shaft portion 34d.
It is fixed to the opposite side of 5 from the fitting portion 82 (downward in FIG. 2).

The base 31 is fitted and fixed to the fitting portion 82, and is arranged on the one side (right in FIG. 1, left in FIG. 2, and upper in FIG. 6). The adjusting screw rod 33 is screwed into the base body 31, and the end portion of the adjusting screw rod 33 contacts the end surface of the protrusion 57. Spring 104
Is connected to the mounting portion 42 and the base 31, and applies a spring force to the end portion of the adjusting screw rod 33 toward the end surface of the protrusion 57.

The brush 37 is made of metal as described above, is made of a plate as is clear from the drawing, and is provided so as to face the rising portion 43. This brush 37 basically has a brush body 67 and a protruding piece 68.
Have and. The brush body 67 has a substantially U-shaped insertion hole.
69 has a through-hole 69, and is attached so as to project in the same direction as the one side of the fitting portion 82 (right side in FIG. 1, left side in FIG. 2, upper side in FIG. 6). Piece 70 is formed. On the surface of the mounting piece 70 opposite to the rising portion 43 (right side in FIG. 6), the projection piece 34
The free end 34a of g is fixed substantially vertically. The contact 71 projects from the brush main body 67 toward the rising portion 43.
71 is disposed at a position further away from the second shaft portion 34e to the one side than the adjusting screw rod 33, that is, a position on the left side of the screw rod 33 in FIG. Protrusion 68
From the brush body 67 to the shaft 34e rather than the adjustment screw rod 33.
Position further away from the side to the one side, that is, the second position
A contact point 72 protruding toward the rising portion 43 is provided at a position on the left side of the threaded rod 33 in the figure.

The electric resistance means 38 is fixed to the opposite side of the rising portion 43 from the mounting portion 42 (upper side in FIG. 2). This electrical resistance means 38
Extends along the moving direction of the contact 71, and the contact 71 elastically abuts. The board 75 is fixed to the opposite side of the rising portion 43 from the mounting portion 42 (upper side in FIG. 2). This substrate 75 is a wiring layer
The wiring layer 76 extends along the moving direction of the contact 72, and the contact 72 elastically abuts. In this way, the electric resistance value between the one end of the electric resistance means 38 and the wiring layer 76 is obtained corresponding to the hydraulic pressure.

EFFECTS OF THE INVENTION According to the present invention, the shaft member 34 is a single wire, its configuration is simple, and furthermore, the support member 41 and the brush 37 are made of metal plates, and thus, In addition, the pressure detection device 30 of the present invention has a simple structure.

Further, according to the present invention, the first and second brackets 45, 46 are provided on the periphery of the first and second insertion holes 44a, 44b of the support member 41.
Are formed, whereby the configuration can be simplified and an increase in the number of parts can be suppressed.

Further, according to the present invention, the first contact point 71 provided on the brush main body 67 of the brush 37 and the second contact point 72 provided on the projecting piece 68 are
The electric resistance means 38 and the wiring layer 76 of the substrate 75 are elastically brought into contact with each other, and the electric resistance value between one end of the electric resistance means 38 and the wiring layer 76 is changed. No special measures such as ensuring electrical contact with the circuit are required, so that the shaft member 34 is smoothly angularly displaced while being supported by the first and second brackets 45 and 46. It is easily possible to do so, and for example, in the above-mentioned embodiment, it is also possible to make the bearing pieces 84, 84a, for example, from synthetic resin, which is an excellent effect that the operation can be smoothed. Is also achieved.

Further, according to the present invention, the free end portion 34a of the protruding piece g of the shaft member 34 is
Mounting piece 70 formed by protruding into the insertion hole 69 of the brush 37.
The brush main body 67 of the brush 37 made of a metal plate exerts a spring force on the brush 37 so that the first contact point is fixed.
It is possible to ensure that 71 is elastically abutted against the electric resistance means 38 as described above. Furthermore, by the spring force of the protruding piece 68 and the spring force of the brush main body 67 described above, the second
It can be ensured that the contact point 72 resiliently abuts the wiring layer 76 of the substrate 75.

Further, according to the present invention, the first contact 71 and the second contact 72 provided on the projecting piece 68 are, as shown in FIG. 2, one side from the second shaft portion 34e rather than the adjusting screw rod 33. (Right in FIG. 1, left in FIG. 2, upper in FIG. 6) are further arranged in a farther position, whereby a threaded rod due to a change in hydraulic pressure is provided.
The axial displacement of 33 is increased so that the first and second contacts 7
1,72 are displaced so that it is possible to accurately detect slight changes in hydraulic pressure.

[Brief description of drawings]

1 is a side view showing a displacement detecting device 30 according to an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is an exploded perspective view thereof, FIG. 4 is a sectional view of a base 31, and FIG. Is the section line V- in FIG.
FIG. 6 is a sectional view showing the structure of the supporting means 35, FIG. 7 is a front view of the bracket 46, and FIG. 8 is an electric resistance means 38 attached to the rising portion 43 of the supporting member 41. FIG. 9 is a cross-sectional view showing a state around the mounting hole 95a, and FIG. 9 is a perspective view showing a structure on which the present invention is based. 30 ... Pressure detecting device, 31 ... Base, 32 ... Detected object, 33 ... Adjusting screw rod, 34 ... Shaft member, 35 ... Supporting means, 36 ... Electrical signal converting means, 37 ... Brush, 38 ... Electrical resistance means, 41 ... Supporting member, 42 ... Mounting part, 43 ... Standing part, 45, 46 ... Bracket, 5
0 ... Diaphragm, 57 ... Protrusion

Claims (1)

[Claims] 1. (a) A diaphragm 50 and (b) pressure oil are supplied, and together with this diaphragm 50,
A lid 55 that forms a diaphragm chamber 56, (c) a protrusion 57 that is fixed to the diaphragm 50 so as to project to the side opposite to the diaphragm chamber 56, and (d) a support member 41 made of a metal plate, (D1) First insertion hole 44a fixed to the lid 55 and facing the protrusion 57
And a mounting portion 42 having (d2) is bent to one side portion of the mounting portion 42 to be integrally connected, and extends parallel to the axial direction of the protrusion 57 so as to move away from the protrusion 57, and is formed so as to rise. Second insertion hole connected to the first insertion hole 4a
A rising portion 43 having 44b, and (d3) at the other end of the mounting portion 42 at the peripheral edge of the first insertion hole 44a.
The first bracket 45 which is erected so as to face the rising portion 43, and (d4) the mounting portion 42 at the rising portion 43 at the peripheral edge of the second insertion hole 44b.
A supporting member 41 having a second bracket 46 facing the first bracket 45 and protruding toward the opposite side; and (e) a shaft member 34 made of a single wire, (e1) A first shaft portion 34d that is rotatably supported by the first bracket 45, and (e2) A second shaft portion that is rotatably supported by the second bracket 46 and that has an axis on the same straight line as the axis of the first shaft portion 34d. 34e
And (e3) a fitting portion formed by bending in a V shape between the first and second shaft portions 34d, 34e and projecting to one side of the axis line.
82, and (e4) Rise 4 more than the second bracket 46 of the second shaft 34e.
The rising piece 34f rising from the end 34c far from 3 and (e5) the rising piece 34f is connected to the end of the rising piece 34f and is spaced from the rising portion 43 by a distance d.
A shaft member 34 having a projecting piece 34g extending toward the rising portion 43 with a gap of 1, and (f) a fitting portion 82 rather than the first bracket 45 of the first shaft portion 34d.
The withdrawal prevention piece 88 fixed to the opposite side, (g) the base 31 that is fitted and fixed in the fitting portion 82, and is arranged on the one side, and (h) screwed into the base 31. , An adjusting screw rod 33 whose end contacts the end face of the protrusion 57, and (i) an adjusting screw rod 33 which is connected to the mounting portion 42 and the base 31.
A spring 104 that applies a spring force to the end face of the protrusion 57 at the end of the brush, and (j) a brush 37 that is made of a metal plate and is provided so as to face the rising portion 43. The brush main body 67 has a substantially U-shaped insertion hole 69, and the attachment piece 70 projects into the insertion hole 69 in the same direction as the one side of the fitting portion 82. Is formed, the free end 34a of the protrusion 34g is fixed substantially vertically to the surface of the mounting piece 70 opposite to the rising portion 43, and the first contact 71 protruding toward the rising portion 43 is used for adjustment. A brush main body 67 located further away from the second shaft portion 34e than the screw rod 33 to the one side, and (j2) from the brush main body 67, from the second shaft portion 34e rather than the adjusting screw rod 33. A projecting piece 68 projecting along the rising portion 43 at a position further away from the one side, the projecting piece 68 projecting toward the rising portion 43 and provided on the projecting piece 68. The brush 37 having the protruding piece 68 having the contact point 72 is fixed to the opposite side of the (k) the mounting portion 42 of the rising portion 43, and the first contact point 71 extends along the moving direction of the first contact point 71. The electrical resistance means 38 that abuts spontaneously, and (l) the substrate 75 fixed to the opposite side of the mounting portion 42 of the rising portion 43, which extends along the moving direction of the second contact 72 and is the second contact. Substrate with a wiring layer 76 on which 72 elastically abuts
75, and (m) the electric resistance value between the one end of the electric resistance means 38 and the wiring layer 76 is changed.