JPH069350Y2 - Hydraulic actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a hydraulic actuating device which is a composite of a fuel pump switch used in an internal combustion engine of an automobile and the like and a variable resistance device for a hydraulic meter.

[Prior Art] FIG. 15 shows an example of a hydraulic actuating device conventionally used. This hydraulic operating device includes a diaphragm b provided at an outlet of a hydraulic passage a, a movable body c movable by the diaphragm b, a resistor e connected to the movable body c via a coil spring d, a resistor e and a coupler f. And a movable contact h interposed with a leaf spring g. In addition,
The leaf spring g is considerably weaker than the coil spring d. The resistor e is formed in a coil shape, and one end of the resistor e is in sliding contact with the free end of the sliding electrode i fixed to the movable body c. Therefore, at the initial stage when the hydraulic pressure is supplied to the hydraulic passage a, the leaf spring g is first deformed to bring the movable contact h and the fixed contact j on the coupler f side into contact with each other to turn on the fuel pump, and then the hydraulic pressure is changed. Since the movable body c moves while compressing the coil spring d as the height increases, the contact point of the sliding electrode i with respect to the resistor e moves. As a result, the resistance value is changed in proportion to the change in the hydraulic pressure, and the resistance value is converted and displayed as the magnitude of the hydraulic pressure on a hydraulic meter (not shown).

[Problems to be Solved by the Invention] In the case of the fuel pump switch having the above structure, the hydraulic pressure applied to the hydraulic passage a is pulsating and the leaf spring g
Since the spring constant of is much smaller, the movable contact h
May cause chattering. Further, when the pulsation of hydraulic pressure becomes large, this phenomenon is promoted.

Therefore, an object of the present invention is to provide a hydraulic operating device including a fuel pump switch that is less likely to cause such chattering, and also to provide a fuel pump switch structure that can make the entire hydraulic operating device compact.

[Means for Solving the Problems] In the hydraulic operating device of the present invention, a reversing switch is used as the fuel pump switch 60, and a movable contact 63 that comes in contact with and separates from a fixed contact 61 provided inside the case 10 is movable. The contact plate 64, a reversing spring 65 for selectively urging the movable contact plate 64 so that the movable contact 63 comes into contact with or separates from the fixed contact 61, and the movable body 40.
And a swing plate 67 that swings in the internal space of the movable body 40 according to the movement of the movable body 40.
The movable contact plate 64 is interlocked with the other end of the movable contact plate 64 when the movable contact plate 64 swings. In this case, the throttle portion 14 can be further provided in the hydraulic passage 13.

[Operation of the Invention] Since the fuel pump switch 60 according to the present invention is a reversing switch, the open / closed state of the movable contact is relatively stable even if the hydraulic pressure pulsates. Therefore, chattering is less likely to occur. In addition, the swing plate 6 that is a member that constitutes the reversing switch and that interlocks the movable contact plate 64
Since 7 is provided in the internal space of the movable body 40 and is swung with the movement of the movable body 40, the entire switch can be made compact, and as a result, the entire hydraulic actuator can be made compact.

Further, when the throttle portion 14 is provided in the hydraulic passage 13, pulsation of hydraulic pressure is suppressed.

[Embodiment] FIGS. 1 to 14 show an embodiment of the present invention. The hydraulic actuating device whose outline is shown in FIG.
This is a device in which a fuel pump switch for F and a variable resistance device for detecting the oil pressure and displaying it on a hydraulic meter provided at another location (not shown) are incorporated in the same case and are integrated. That is, as shown in FIG. 2 which is an exploded view of each component and FIG. 3 which is a vertical section, a coupler 20 is attached to one end of a case 10, and the case 10 is an oil pump (not shown). It is composed of a base portion 11 connected to a hydraulic circuit and a cylindrical portion 16 having a substantially cylindrical shape, and a diaphragm 30, a movable body 40, an immovable body 50, a pressure canceling device 80, a return spring device 90, and the like are housed therein. A fuel pump switch 60 is provided on one side of the stationary body 50, and a variable resistance device 70 (see FIG. 6) is provided on the other side. The detailed structure of each part will be described below.

As shown in FIG. 3 which is a longitudinal section showing the fuel pump switch 60 side of this hydraulic operating device and FIG. 4 which is a left side surface, the base portion 11 is a bottomed member having a mounting screw portion 12, and A hydraulic passage 13 is opened at the center of the screw portion 12, and a part of the hydraulic passage 13 is narrowed to form a jet portion 14. The jet portion 14 acts to suppress the pulsation of the pressurized oil fed into the hydraulic passage 13 from the oil pump when the attaching screw portion 12 is attached to the hydraulic circuit. Further, an inward flange-shaped caulking portion 15 is formed at a connecting portion between the base portion 11 and the tubular portion 16, and the caulking portion 15 is formed on one end portion of the tubular portion 16 so as to overlap with each other so as to be in close contact with each other. It has become.

As shown by the chain double-dashed line in FIG.
It is obtained by forming an annular wall portion in advance and folding it inward. Reference numeral 18 in the drawing is a crimped portion 15.
Numeral 19 is an escape recess for folding back, and numeral 19 is a step portion facing the flange portion 17 formed by this recess 18.

The coupler 20 is divided into two left and right chambers by a partition wall 20a at an intermediate portion thereof, and a coupler portion 22 is formed inside of which a space 21 for accommodating the pressure canceling device 80 is formed.

The space 21 is surrounded by the side wall of the extension portion 20b, and the partition wall 2
It is a cylindrical space having an opening 0a at the bottom and opening to the inside, and communicates with the coupler portion 22 through an atmosphere opening port 23 formed in the partition wall 20a. The inner end portion of the extension portion 20b is fitted inside the tip end portion of the tubular portion 16, and is hermetically connected by the seal member 24. A spring receiving portion 25 is formed on the end surface of the opening of the extension portion 20b. A split groove is formed in the spring receiving portion 25 in the radial direction to enable positioning of a conductor end portion described later.

As shown in FIG. 5, which is a right side view of the entire device, the coupler unit 22 accommodates four connecting terminals 26 to 29.

The diaphragm 30 is housed in the recessed space 11a of the base 11 so as to cover the inner opening of the hydraulic passage 13, and a relatively wide and annular enlarged portion 31 is integrally formed on the peripheral portion thereof.
This portion is sandwiched between the end surface of the base portion 11 and the surface of the flange portion 17 and is liquid-tightly sealed. By thus widening the enlarged portion 31, it is possible to prevent breakage from the sandwiching portion.

The movable body 40 is a cylindrical member having a bottom, is housed inside the diaphragm 30, and when the pressurized oil is supplied into the hydraulic passage 13, the movable body 40 can move to the right in the figure together with the diaphragm 30. . A flange 41 is provided on the outer peripheral portion of the movable body 40, and serves as a stopper when moving leftward in the drawing with respect to the stepped portion 19 and also functions as a spring receiver described later. A boss 43 is provided at a position displaced from the center of the bottom portion 42.
Are erected integrally. Further, a thin wall portion 4 is formed inside the tip end portion in a part of an annular wall portion 45 (see FIG. 6) that extends rightward in the drawing from the flange 41 and forms a sliding space 44 inside.
6 is formed and is connected to the general thick portion by the tapered portion 47.

The immovable body 50 has an H-shaped cross section and has an extending portion 50a whose front end can fit into the sliding space 44.
Spaces 50c and 50d are defined on both sides by b. A fuel pump switch 60 including a micro switch having a reversing spring is housed in the space 50c.

FIG. 7 shows the fuel pump switch 6 for the stationary body 50.
It is a figure showing assembly of 0, and fuel pump switch 60
Is a bent plate member 62 which is a conductor having a fixed contact 61 at one end, a frame-shaped movable contact plate 64 having a movable contact 63 at one end and an elongated hole 64a formed therein, the movable contact plate 64 and a reversing spring. A support plate 66 of a conductor which is connected via 65 and is bent in two steps, a swing plate 67 whose one end is supported by the support plate 66 as a fulcrum, and a stepped pin for moving one end of the swing plate 67 up and down. And a member 68. The reversing spring 6
5 has one end 65a engaged in the end of the elongated hole 64a on the side of the movable contact 63, and the other end of the hole 6 formed in the upper step of the support plate 66.
6b is engaged. One end 66a of the support plate 66 extends upward through the elongated hole 64a. The upper end portion 67a of the rocking plate 67 is also a receiving portion which passes through the inside of the elongated hole 64a, is upwardly bent, and is bent in the horizontal direction so that the flange portion 68a of the pin member 68 abuts. A lower end portion 67b of the swing plate 67 is engaged with a hole 66c formed in an upper step portion of the support plate 66. Further, connection holes 66d and 62a are formed at the lower end of the support plate 66 and the upper end of the bent plate member 62, and the end portions 26a and 27a of the terminals 26 and 27 are formed therein.
Has been pierced (see FIG. 3).

In FIG. 7, reference numeral 51 is a cutout portion into which the head portion of the pin member 68 is fitted in and out freely, 52 is a cutout portion for engaging the upper end portion 66a of the support plate 66, and 53 is a base portion 50e of the immovable body 50.
The groove 54a formed at the boundary with the stopper 54a is integrally formed with the extension 50a for restricting the upward movement position of the movable contact 63, and 54b is the extension 55 for supporting the fixed contact 61. Is a groove for fitting the lower end of the support plate 66.

Also, the grooves 50f and 50g formed in the base portion 50e.
(See also FIG. 3) is for penetrating the end portions 26a and 27a of the terminals 26 and 27, and coincides with the positions of the conductors, for example, the holes 62a of the bent plate member.
Further, the lid 50h is a lid that covers the side of the space 50c,
A boss is projectingly provided on the inner surface of the boss, and the boss is mounted by fitting the boss into a mounting hole formed in a side portion of the extending portion 50a.

On the other hand, the variable resistance device 70 is housed in the space 50d.
FIG. 8 shows an essential part of a cross section displaced by 180 ° with respect to FIG. 3 so as to vertically cut the variable resistance device 70. The variable resistance device 70 includes a sliding electrode 71 and a planar resistor 72.
And a grounding conductor 73. As shown in FIG. 9, the sliding electrode 71 is formed of a leaf spring member having a bifurcated shape and a free end side which tends to expand, and is attached to the top of the boss 43 of the movable body 40 by a caulking member 74 at the center. . Known wire brushes 75 are welded to both free ends of the sliding electrode 71.

On the other hand, in the planar resistor 72, a well-known resistance layer 78 made of, for example, a mixture of carbon and alumina is formed on a metal conductor 76 with an insulating ceramic 77 sandwiched between them. Each tip of the resistance layer 78 and the metal conductor 76 is formed. The parts are conducted by solder 79 and the like. The grounding conductor 73 is made of an appropriate metal conductor. The end portions of the sheet-shaped resistor 72 and the grounding conductor 73 are also electrically connected by connecting the end portions 28a and 29a (see FIG. 2) of the terminals 28 and 29, respectively.

Therefore, when the sliding electrodes 71 are moved together with the movable body 40 while the wire brushes 75 on both ends of the sliding electrode 71 are in contact with the grounding conductor 73 and the resistance layer 78, respectively, the resistance value changes.

FIG. 11 is a view of mounting the components of the variable resistance device 70 on the extending portion 50a. Grooves 56 and 57 are vertically formed at the boundary between the extending portion 50a and the base portion 50e, and the extending portion 50a is extended. The boss 58 is provided at a predetermined interval along the upper side of the portion 50a.
Are formed, the groove 56 and the boss 58 and the extending portion 5 are formed.
The bent sheet-shaped resistor 72 is press-fitted into the gap with 0a. At this time, the bent end portion of the metal conductor 76 extends along the front surface of the base portion 50e, and the hole 76a and the groove 50f of the base portion 50e are aligned with each other. Further, since the extending portions 59 are integrally formed at a predetermined interval on the lower side of the extending portion 50a so that the groove 57 is formed by bending, the bent earth conductor 73 is press-fitted into this gap. Thereafter, the lid 50i is further attached so as to cover the side portion of the space 50d. This attachment is the lid 50 described above.
Similar to h, it is performed by fitting a boss integrally formed inside to the upper and lower sides of the extending portion 50a and the mounting holes formed in the boss 58.

Reference numeral 50j in FIG. 8 is a vent for communicating with the space 21 of the coupler 20.

FIG. 12 shows a small assembly state of the immovable body 50 and the coupler 20, which is a state where the end portions 26a to 29a of the respective terminals are projected on the inner end surface of the coupler 20 as shown in FIG. Then, the immovable body 50 incorporating the fuel pump switch 60 and the variable resistance device 70 (see FIGS. 7 and 11) is mounted. At this time, since the base portion 50e is formed with the grooves 50f and 50g corresponding to the holes 62a, 66d, 73a and 76a (see also FIGS. 7 and 11 for each hole) of the conductor end portions. , Each protruding end 2
6a to 29a are passed through the corresponding holes and then caulked. That is, the terminal 27 and the support plate 6 are shown in FIG.
When the end portion 27a is pierced through the hole 66a of the support plate 66 and then the tip end portion of the end portion 27a is split open by a pressing device as illustrated in FIG. The fixing of the coupler 20 and the immovable body 50 by caulking and the conductive connection of each conductor and each terminal are simultaneously achieved. Prior to the integration of the coupler 20 and the immovable body 50, the components of the pressure canceling device 80 described later are housed in the space 21 of the coupler 20 in advance.

As shown in FIG. 3, the pressure canceling device 80 has a space 21
It is composed of a bellows 81 made of rubber, an appropriate synthetic resin, or the like housed inside and an atmosphere opening port 23. One end of the bellows 81 is opened to form a thick portion 82, and a ring 83 made of hard plastic or the like is fitted inside. In a state before the bellows 81 is accommodated in the space 21, the outer diameter of the thick portion 82 when the ring 83 is fitted is set to be equal to or larger than the inner diameter of the space 21. Therefore, when the bellows 81 is press-fitted into the space 21, the thick portion 82 comes into close contact with the inner surface of the extension portion 20b, and the coupler 20
Since the ring 83 is in close contact with the inside of the partition wall 20a, the bellows 81 hermetically seals the inside with respect to the atmosphere opening port 23. The top portion 84 of the bellows 81 is covered by the base portion 50e attached to the opening of the space 21. However, space 2
Since the inside of 1 and the space inside the cylindrical portion 16 are communicated with each other by the vent 50j, the rise of the internal pressure due to the movement of the movable body 40 can be canceled by the pressure canceling device 80.

In the pressure canceling device 80 of this embodiment, the atmosphere opening port 23 is formed so as to communicate with the inside of the coupler portion 22, but a lateral hole communicating with the inside of the bellows 81 is formed in the space 2.
Alternatively, it may be formed directly on the extension portion 20b forming 1. Furthermore, a diaphragm can be used when the amount of air to be canceled is relatively small.

Also, by covering with a film that allows only the passage of gas and blocks the passage of liquid, it is possible to prevent the intrusion of water from the atmosphere opening port 23 and cancel the pressure.

Further, a pipe member communicating with the inside of the tubular portion 16 is provided outside,
Moreover, if the open end is directed downward when the vehicle is mounted, pressure cancellation and water intrusion can be prevented.

The return spring device 90 includes a resistance side return spring 91 having a relatively large spring constant, a spring receiving ring 92, and a switch side return spring 93 having a relatively small spring constant. These are provided around the movable body 40 and the extending portion 50a. The resistance side return spring 91 is elastically mounted between the flange 41 and the spring receiving ring 92, and
3 is mounted between the spring receiving ring 92 and the spring receiving portion 25.

Next, the operation of this embodiment will be described. First, FIG. 3, that is, the fuel pump switch 60 and the variable resistance device 70.
In the pre-operation state of, the internal combustion engine (not shown) starts,
When pressurized oil is supplied to the hydraulic passage 13, the diaphragm 3
0 is pushed to the right in the figure, which simultaneously causes the movable body 4
0 is pressed. Then, since the resistance side return spring 91 having a relatively large spring constant is not compressed, the movable body 40 moves to the right in the figure while compressing only the switch side return spring 93 having a relatively small spring constant.
By this movement, when the tapered portion 47 rides on the pin member 68, the pin member 68 is pushed downward,
The upper end 67a of the swing plate 67 swings counterclockwise around the lower end 67b as a fulcrum, and pulls down the movable contact plate 64 against the elasticity of the reversing spring 65. As a result, when the movable contact plate 64 descends below the dead point of the reversing spring 65,
Since the reversing spring 65 reverses the urging direction and pushes the movable contact plate 64 obliquely downward, the movable contact 63 comes into contact with the fixed contact 61, the switch is turned on, and the fuel pump is operated. Since the fuel pump switch 60 is composed of a reversing switch, even if the hydraulic pressure supplied to the hydraulic passage 13 pulsates, the ON or OFF state can be maintained without being greatly affected by the pulsation. Moreover, since the jet 14 is provided in the hydraulic passage 13, the pulsation itself can be suppressed.

Next, when the pressure applied to the hydraulic passage 13 is further increased,
The movable body 40 further advances to the right, and eventually the resistance side return spring 91 starts to be compressed. Then, the wire brush 75 formed at the tip of the sliding electrode 71 moves together with the movable body 40 while slidingly contacting the grounding conductor 73 and the planar resistor 72 , so that the resistance value changes. Therefore, the hydraulic pressure corresponding to this resistance value can be converted and displayed on a hydraulic meter (not shown).

In this embodiment, since the sheet-shaped resistor 72 is used and the wire brush 75 is slidably contacted with the sheet-shaped resistor 72 , the change in the detected resistance value becomes smooth as shown in FIG. Even if 71 is inclined, it becomes easy to keep some of the many wires constituting the wire brush 75 in contact with the planar resistor 72 at all times.

When the movable body 40 further moves to the right in such a state, the internal pressure in the tubular portion 16 gradually increases. Then, since the bellows 81 is pushed through the vent hole 50j (see FIG. 8) formed in the base portion 50e, the air in the bellows 81 escapes from the atmosphere opening port 23 into the coupler portion 22, so that the pressure rise is canceled. . Therefore, the rise of the internal pressure can be prevented, and the change of the resistance value can be prevented by the movable body 40.
Can be approximated to be linear in correspondence with the movement amount of. This state is clear from FIG.

Since the bellows 81 hermetically seals the atmosphere opening port 23 with respect to the inside of the tubular portion 16, it is possible to prevent not only water droplets but also water vapor from entering to a considerable extent. Further, in this embodiment, since the immovable body 50 and the coupler 20 are caulked and fixed, the work is simple and quick, and the fuel pump switch 60 and the variable resistance device 70 are incorporated on both sides of the extending portion 50a. If the steps of FIG. 7 and FIG. 11 to FIG. 13 are continuously performed, the assembly work by automation becomes possible and the workability can be further improved.

In addition, the swing plate 6 for interlocking the movable contact plate 64
Since 7 is provided in the internal space of the movable body 40 and swings as the movable body 40 moves, the entire fuel pump switch 60 becomes compact, and as a result, the entire hydraulic actuator can be made compact. .

When the movable body 40 moves in the opposite direction and the tapered portion 47 separates from the pin member 68, the pin member 68 is released and pushed down by the restoring elasticity of the swing plate 67. At this time, the oscillating plate 67 interlocks the movable contact plate 64 to move it upward in FIG. 3, so that the reversing spring 65 reverses the urging direction and pushes the movable contact plate 64 obliquely upward. Is separated from the fixed contact 61 to turn off the fuel pump switch 60.

[Advantages of the Invention] The invention of the hydraulic actuator according to claim 1 uses a reversing switch as the fuel pump switch, and a movable contact plate having a movable contact at one end that comes in contact with and separates from a fixed contact provided in the case; A reversing spring that selectively urges the movable contact plate to either a state where the movable contact comes in contact with the fixed contact or a state where the movable contact separates from the fixed contact, and an oscillating plate that oscillates in its internal space as the movable body moves. The oscillating plate comes into contact with the other end of the movable contact plate to interlock the movable contact plate during the oscillating motion.

Therefore, chattering is less likely to occur. Moreover, since a swing plate that is a member of the reversing switch and that interlocks the movable contact plate is provided in the internal space of the movable body and is configured to swing with the movement of the movable body, The entire switch is compact, and as a result, the entire hydraulic actuator can be compact.

Further, in the invention according to claim 2, in the hydraulic actuating device according to claim 1, the pulsation of hydraulic pressure can be further suppressed by providing the throttle portion in the hydraulic passage.

[Brief description of drawings]

1 to 14 show an embodiment of the present invention, FIG. 1 is an external perspective view, FIG. 2 is an exploded perspective view, FIG. 3 is a longitudinal sectional view, and FIG. 4 is a left side view. FIG. 5 is a left side view, FIG. 6 is a sectional view taken along line VI-VI of FIG. 3, FIG. 7 is a developed perspective view of a main part, FIG. 8 is a cross-sectional view of the main part, and FIG. A perspective view, FIG. 10 is a developed perspective view of a main part, FIGS. 11 to 13 are perspective views of the main part, and FIG. 14 is a graph showing changes in hydraulic pressure and resistance value. FIG. 15 is a sectional view of a conventional example. (Explanation of reference numerals) 10 ... Case, 13 ... Hydraulic passage, 14 ... Throttling portion, 20 ...
Coupler, 30 ... Diaphragm, 40 ... Movable body, 50
... Immovable body, 60 ... Fuel pump switch, 70 ... Variable resistance device, 71 ... Sliding electrode.

Claims (2)

[Scope of utility model registration request] 1. A fuel pump switch (60) connected by an increase in hydraulic pressure and a movable body (40) having a sliding electrode (71) slidably contacting a resistor (72) are moved according to the hydraulic pressure. In a hydraulic operating device in which a variable resistance device (70) for a hydraulic meter for changing a resistance value is integrally incorporated in the same case (10), the fuel pump switch is a reversing switch, and the fuel pump switch is inserted into the case (10). Movable contact (63) that comes in contact with and separates from the fixed contact (61) provided
And a reversing spring for selectively urging the movable contact plate (64) to one of a state where the movable contact (63) contacts the fixed contact (61) and a state where the movable contact (63) contacts the fixed contact (61). (65) and an oscillating plate (67) that oscillates in the internal space of the movable body (40) as the movable body (40) moves. The oscillating plate (67) includes a movable contact plate (67). 64) abutting against the other end of the movable contact plate (6
4) A pressure actuating device characterized by interlocking. 2. The hydraulic actuator according to claim 1, wherein the utility model is registered, and the throttle portion (1) is provided in the hydraulic passage (13).
4) A hydraulic actuating device characterized by being provided.