JPH0530112Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a hydraulic actuation device which is a combination of a fuel pump switch and a variable resistance device for a hydraulic pressure meter used in internal combustion engines of automobiles and the like.

[Prior Art] Fig. 13 shows an example of a conventionally used hydraulic actuator. This hydraulic actuator includes a hydraulic passage a, a diaphragm b, and a movable body c at one end of the case.
A coil spring d is elastically mounted around the movable body c. On the other hand, a resistor e provided inside the movable body c is supported by an extension part inside the case of a coupler f attached to the other end of the case, and a plate spring g is interposed around this extension part. , a movable contact h is loosely fitted into one end of a coil spring d. The leaf spring g and the coil spring d constitute a two-stage spring, with the former being considerably weaker than the latter. Further, the resistor e is formed in a coil shape, and a free end of a sliding electrode i whose one end is fixed to the movable body c is in sliding contact with the inner surface of the resistor e. Therefore, when hydraulic pressure is supplied from the hydraulic passage a, the leaf spring g is first deformed, the movable contact h contacts the fixed contact j on the coupler f side, turning on the fuel pump, and when the hydraulic pressure increases further, The movable body c moves by compressing the coil spring d, and the contact point of the sliding electrode i with the resistor e changes accordingly, so that the resistance value changes in proportion to the change in oil pressure. This change in resistance value is converted and displayed as a change in oil pressure on an oil pressure meter (not shown).

Note that terminals k and l are connected to a resistor e and its grounding conductor, and terminals m and n are connected to a movable contact h and a fixed contact j.

[Problems to be Solved by the Invention] In the case of the above structure, since the pressurized oil in the hydraulic passage a is constantly pulsating, the leaf spring g may be affected and the movable contact h may suffer from chattering. Therefore, it is conceivable to use a micro switch as the switch, but in this case, it is desirable to reduce the hysteresis loss when opening and closing the switch, improve the accuracy of the operation, and improve the responsiveness. Furthermore, when the movable body c moves, the internal pressure increases and changes in oil pressure and changes in resistance value no longer correspond linearly, so it is also necessary to provide a pressure cancel device.

Therefore, an object of the present invention is to provide a hydraulic actuator that is equipped with a highly responsive switch and a pressure cancel device.

[Means for Solving the Problems] The hydraulic actuator of the present invention uses a fuel pump switch as a reversing switch, makes the operating direction of its pressing member coincide with the moving direction of the movable body, and is also equipped with a pressure cancel device. It is characterized by In addition,
The pressure canceling device can be arranged around the fuel pump switch or connected in series.

[Operation of the invention] In the present invention, the fuel pump switch is a reverse switch, so it is less susceptible to pulsation. Further, when the movable body moves, the pressing member follows the movement with less hysteresis loss because the operating direction coincides. Furthermore, the accuracy of operation is increased. Moreover, if the pressure cancel device is disposed around the fuel pump switch, the length of the entire device will be shortened, and if it is arranged in series, the structure will be simplified.

[Embodiment] An embodiment of the present invention is shown in FIGS. 1 to 8.
The hydraulic actuator, the outline of which is shown in Figure 1, includes a fuel pump switch for turning the fuel pump on and off,
This is a complex integrated device in which a variable resistance device for detecting oil pressure and displaying it on an oil pressure meter installed at a separate location (not shown) is incorporated into the same case. That is, FIG. 2 shows a longitudinal section of the device, FIGS. 3 and 4 show a cross section, FIG. 5 shows a left side view,
and Fig. 6, which shows a part of the cross section that differs by 90 degrees from Fig. 2.
As shown in the figures, a coupler 20 is attached to one end of a case 10, and the case 10 has a base 1 connected to a hydraulic circuit of an oil pump (not shown).
1 and a substantially cylindrical tube part 16, inside which a diaphragm 30, a movable body 40, a stationary body 50, a pressure canceling device 80 (see FIG. 6),
A return spring device 90 and the like are accommodated. Note that the immovable body 50 is equipped with a variable resistance device 60.
However, a fuel pump switch 70 is also provided in a portion of the coupler 20 adjacent to the stationary body 50. The coupler 20 and the immovable body 50 are a small assembly that has been integrated in advance, as shown in FIG. 7. The detailed structure of each part will be explained below.

The base 11 is a bottomed member having a threaded part 12 for mounting, and a hydraulic passage 13 is formed in the center of the threaded part 12 for mounting, and a part of this is constricted to form a jet part 14. This jet portion 14 acts to suppress the pulsation of pressurized oil sent into the hydraulic passage 13 from the oil pump when the mounting screw portion 12 is attached to the hydraulic circuit. In addition, the base 1
A caulking part 15 is formed at the connection part between 1 and the cylindrical part 16, and overlaps with an outward flange part 17 formed at one end of the cylindrical part 16, so that the two are tightly integrated.

This caulking portion 15 is obtained by forming an annular wall portion in advance and folding it inward, as shown by the two-dot chain line in FIG. In the figure, reference numeral 18 is a relief recess for folding back the caulked portion 15, and reference numeral 19 is a stepped portion opposite to the flange portion 17 formed by the recess 18.

The coupler 20 consists of a coupler part 21 that accommodates the connection part of the terminal and an extension part 22 that extends inward of the cylindrical part 16, and the periphery of the extension part 22 is fitted into the cylindrical part 16.
They are tightly joined via a seal ring 23.

The extension 22 is provided with a diametrically extending space 24 in its center for accommodating a fuel pump switch 70, as shown in FIGS. 4 and 5. Like, space 2
Two spaces 25 for accommodating pressure canceling devices 80 are provided on both sides of the pressure canceling device 80, respectively. Note that the space 24 is formed long in the diametrical direction, whereas the space 25 is formed long in the axial direction. In addition, each space 25 has a coupler section 21.
A communication hole 25a formed extending in the direction is connected. A communication hole 25b extending perpendicularly to the outside is formed at one end of the communication hole 25a.

On the other hand, a stepped portion 20a is formed at the connection portion of the coupler 20 with the immovable body 50. A lateral hole 20b is formed through the stepped portion 20a in the diametrical direction.
is formed.

As shown in FIG. 5, four terminals 26 to 29 are accommodated within the coupler portion 21, and the intermediate portions of each of these terminals 26 to 29 are embedded and integrated into the extension portion 22. In addition, terminals 26 and 2
7 is a terminal of a variable resistance device 60, and terminals 28 and 29 are terminals of a fuel pump switch 70.

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 annular enlarged portion 31 is integrally formed at the periphery of the diaphragm 30. It is sandwiched between the end face and the surface of the flange portion 17 and is sealed liquid-tightly. By making the enlarged portion 31 wide in this manner, breakage from the clamping portion can be prevented.

The movable body 40 is a cylindrical member with a bottom, and is housed inside the diaphragm 30 so that it can move to the right in the figure together with the diaphragm 30 when pressurized oil is supplied into the hydraulic passage 13. . A flange 41 is provided on the outer periphery of the movable body 40, and serves as a stopper when moving leftward in the figure with respect to the stepped portion 19, and also functions as a spring receiver to be described later. A boss 43 is integrally provided upright on the bottom portion 42. Further, as shown in FIG. 3, a rectangular cylindrical wall portion 45 is provided that extends from the flange 41 to the right in the figure and forms a sliding space 44 inside.

The immovable body 50 has a rectangular cylindrical resistance mounting portion 50a and a substantially circular base portion 50b, and the distal end side of the resistance mounting portion 50a can be fitted into the wall portion 45.

Upper side 50c and lower side 50d of resistor mounting part 50a
A planar resistor 61 and a grounding conductor 62 are attached to the inside of each. A square hole 50e is formed in the center of the stationary body 50. Further, grooves 50f and 50g are formed in the base 50b at positions corresponding to the upper side 50c and the lower side 50d, and a resistor 61 and a grounding conductor 62 can be fitted into these grooves from the sides, respectively. .

Each end of the planar opposing body 61 and the grounding conductor 62 is connected to one end of each of L-shaped connecting sides 63 and 64. The other ends of each of the connecting sides 63 and 64 extend radially along the inner end surface 20c of the coupler 20, and are connected to the respective ends 28a and 29a of the terminals 28 and 29 here.

On the other hand, a bifurcated sliding electrode 65 is attached to the boss 43. A wire brush 66 is provided at the free end of the sliding electrode 65, and this wire brush 66 slides on the resistors 61 and 62 to change the resistance value.
Note that the variable resistance device 60 is constituted by the planar resistor 61, the grounding conductor 62, and the sliding electrode 65.

The fuel pump switch 70 is located in the side hole 2 of the extension 22.
Lever 71 inserted into 0b, fixed contact 7 provided on support portion 28a which is one end of terminal 28
2. A frame-shaped movable contact plate 75 having a movable contact 73 at one end and having an elongated hole 74 formed therein; this movable contact plate 75;
and the terminal 29 connected via the reversing spring 76.
A support portion 29a which is one end portion of the support portion 29a, and this support portion 29
a rocking plate 77 whose one end is supported as a fulcrum, and a stepped pressing member 7 that moves one end of the rocking plate 77 up and down.
It consists of 8. Note that one end of the reversing spring 76 is engaged into the end of the elongated hole 74 on the movable contact 73 side, and the other end is engaged with a hole formed in the upper part of the support portion 29a. The upper end of the swing plate 77 also passes through the elongated hole 74 and exits upward, and then bends in the horizontal direction, and the flange portion 79 of the pressing member 78 is in contact with this.
Since the pressing member 78 moves back and forth in the axial direction with respect to the stepped portion 20a, its operating direction coincides with the moving axis direction of the movable body 40. The lower end of the rocking plate 77 engages with a hole formed in the step of the support portion 29a.

As shown in FIG. 6, the pressure cancel device 80 is comprised of a bellows 81 made of rubber or a suitable synthetic resin housed in a space 25, a communication hole 25a, and an atmosphere opening 25b. One end of the bellows 81 is open to form a thick walled portion 82, into which a ring 83 made of hard plastic or the like is fitted. When the bellows 81 is press-fitted into the space 25, the thick portion 82 comes into close contact with the inner surface of the space 25, thereby airtightly sealing the inside with respect to the atmosphere opening 25b. However, since the inside of the space 25 and the space on the side of the movable body 40 in the cylindrical portion 16 are communicated with each other, an increase in internal pressure due to movement of the movable body 40 can be canceled by the pressure canceling device 80.

Note that the pressure cancel device 8 in this embodiment
The atmosphere opening port 25b of No. 0 may be communicated with the inside of the coupler portion 21.

The return spring device 90 consists of 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 a movable body 40 and a stationary body 50.
is located around the. The resistance side return spring 91 has a flange 41 and a spring receiving ring 9.
The switch-side return spring 93 is loaded between the spring receiving ring 92 and the lever 71.

When no load is applied to the switch side return spring 93, one end of the lever 71 is pushed up by the pin member 78 due to the elasticity of the reversing spring 76, so that it is somewhat compressed.

Next, the operation of this embodiment will be explained. First, in FIG. 2, that is, in the state before the operation of the fuel pump switch 70 and the variable resistance device 60, when the internal combustion engine (not shown) starts and pressurized oil is supplied to the hydraulic passage 13, the diaphragm 30 moves to the right in the figure The movable body 40 is pushed at the same time. Then, as shown in FIG. 8, the resistance return spring 91, which has a relatively large spring constant, is not compressed, so the movable body 40 compresses only the switch return spring 93, which has a relatively small spring constant. As a result, when the elasticity of the switch-side return spring 93 exceeds the reversing spring 76, the lever 71 is pushed down together with the pressing member 78, so that the upper end of the swing plate 77 swings counterclockwise with the lower end as a fulcrum. , the movable contact plate 75 is pulled down toward the fixed contact 72 against the elasticity of the reversing spring 76. As a result, when the movable contact plate 75 exceeds the dead point of the reversing spring 76, the reversing spring 76 reverses its biasing direction and pushes the movable contact plate 75 to the right in the figure, so that the movable contact 73 moves closer to the fixed contact 76.
When it comes into contact with the switch, it turns on and activates the fuel pump.

Since the fuel pump switch 70 is constituted by a reversing switch, even if the oil pressure supplied to the hydraulic passage 13 pulsates, it can maintain the ON or OFF state without being affected much. Moreover, since the jet 14 is provided in the hydraulic passage 13, pulsation itself can be suppressed.

Furthermore, since the operating direction of the pressing member 78 is aligned with the moving axis direction of the movable body 40, the pressing member 78 can come into contact with the lever 71 that receives the force of the switch-side return spring 93 from a substantially orthogonal direction. , hysteresis loss associated with turning on and off the switch is reduced, and operating accuracy is improved.

Next, when the pressure on the hydraulic passage 13 increases further, the movable body 40 moves further to the right, and eventually the resistance return spring 91 begins to be compressed. Then, the sliding electrode 6 along with the movable body 40
Since the wire brush 66 formed at the tip of the ground conductor 62 and the sheet resistor 61 moves in sliding contact with the ground conductor 62 and the sheet resistor 61, the resistance value changes. Therefore, the oil pressure corresponding to this resistance value can be converted and displayed on an oil pressure meter (not shown).

In this embodiment, since the sheet resistor 61 is used and the wire brush 66 is brought into sliding contact with the sheet resistor 61, the change in the detected resistance value is smooth, and even if the sliding electrode 65 is tilted, the wire brush 66 will not touch the wire brush 66. It becomes easy to make it possible for some of the many wires constituting the wire 66 to maintain contact with both the sheet resistor 61 and the grounding conductor 62 at all times.

When the movable body 40 further moves to the right in this state, the internal pressure within the cylindrical portion 16 gradually increases. Then, the air inside the bellows 81 escapes to the outside through the atmosphere opening 25b, thereby canceling the pressure increase. Therefore, an increase in internal pressure can be prevented, and the change in resistance value can be approximated linearly in correspondence with the amount of movement of the movable body 40. Note that since the bellows 81 airtightly seals the air opening 25b against the inside of the cylindrical portion 16, it is possible to prevent not only water droplets but also water vapor from entering to a considerable extent.

In this embodiment, since the pressure cancel device 80 is disposed around the fuel pump switch 70, the overall length of the device can be made shorter.

Next, other embodiments are shown in FIGS. 9 to 12. Note that parts having the same functions as those in the previous embodiment are designated by the same reference numerals.

As shown in FIGS. 9 and 10, the hydraulic operating device according to this embodiment includes a space 24 for accommodating a fuel pump switch 70 and a pressure cancel device 8.
A space 25 for accommodating 0 is arranged in series. That is, as shown in FIG.
A space 25 is provided within the extension portion 22 between the switch accommodating portion 50h and the coupler portion 21.

The fuel pump switch 70 has the same structure as in the previous embodiment, but the tip of the pressing member 78 contacts a ring 92 and is operated by this. That is, the ring 92 forms support parts 92a and 92b whose opposite ends are bent in opposite directions, and the support part 9
A switch-side return spring 93 is elastically supported between 2a and the distal end surface of the switch accommodating portion 50h,
The support portion 92b elastically supports the resistance return spring 91 between the support portion 92b and the flange 41. Furthermore, this support portion 92b is in contact with the head of the pressing member 79. Note that the partition wall provided between the space 25 and the coupler section 21 has an atmosphere opening 25b.
is formed, and communicates between the coupler portion 21 and the inside of the bellows 81. In addition, planar resistors 61 and 62 extend toward the front surface of the resistor mounting portion 50a through the outside of the switch housing portion 50h, and the sliding electrodes 65 that come into sliding contact with these resistors have wire brush 66 portions that are mutually connected to each other. They are constructed so that they are close together and become narrow.

Next, the operation of this embodiment will be explained. First, when a slight hydraulic pressure is applied from the hydraulic passage 13 to the diaphragm 30, only the switch side return spring 93 is compressed due to the movement of the diaphragm 30 and the movable body 40 (to the right in FIG. 9), so that the ring 92 11, the support part 92b pushes the pressing member 78, interlocks the swing plate 77, reverses the urging direction of the reversing spring 76, and brings the movable contact plate 73 into contact with the fixed contact 72. As a result, the fuel pump switch 70 is turned on.

In this embodiment, since the ring 92 is used to press the pressing member 78, the switch can be turned on more reliably. Next, the hydraulic passage 13
When the oil pressure is increased from
The resistance value corresponding to the hydraulic pressure is shown by sliding the back surface of the At this time, the sliding electrode 65 is connected to the wire brush 66.
Since the space between the resistors 61 and 62 is narrow,
This makes it easier to maintain a constant surface pressure.

As the oil pressure gradually increases and the amount of movement of the movable body 40 increases, the internal pressure rises to the extent that it impedes its movement, and the bellows 81 elastically deforms in the compression direction, releasing the air inside from the atmosphere opening to the coupler section 21. Let go. Thereby, the increase in internal pressure is canceled, and the movement of the movable body 40 can be caused to correspond linearly to changes in the oil pressure.

As described above, according to this embodiment, the fuel pump switch 70 and the pressure cancel device 80 are connected in series, so that the structure of the pressure cancel device 80 can be simplified.

[Effects of the invention] The hydraulic actuator according to the invention uses a reversing spring as the fuel pump switch, and the operating direction of the pressing member of this switch is made to coincide with the moving axis direction of the movable body, so hysteresis when opening and closing the switch is eliminated. Loss can be reduced and operation accuracy can be improved.

Furthermore, by arranging the pressure cancel device around the fuel pump switch, the overall length of the device can be shortened and made compact.

Furthermore, if a pressure canceling device is arranged in series between the fuel pump switch and the coupler, the opening to the atmosphere can be easily formed.

[Brief explanation of the drawing]

1 to 9 show an embodiment of the present invention,
Figure 1 is a perspective view of the exterior, Figure 2 is a longitudinal cross-sectional view, and Figure 3 is a vertical sectional view.
The figure is a sectional view taken along the - line in Fig. 2, Fig. 4 is a sectional view taken along the - line in Fig. 2, Fig. 5 is a right side view, Fig. 6 is a sectional view of the main part, and Fig. 7 is a perspective view of the main part. 8 is a sectional view of the main part, FIGS. 9 to 12 show other embodiments, FIG. 9 is a longitudinal sectional view, FIG. 10 is a sectional view taken along the - line in FIG. The figure is a sectional view of the main part, 12th
The figure is a perspective view of main parts. FIG. 13 is a sectional view of a conventional example. Explanation of symbols, 10... Case, 20... Coupler, 30... Diaphragm, 40... Movable body, 50... Stationary body, 60... Variable resistance device, 70... Fuel pump switch, 78... Pressing member , 80... pressure cancel device, 90... return spring device.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A reversing switch type fuel pump switch that connects when oil pressure increases, and a movable body equipped with a sliding electrode whose free end slides on a resistor, moving in response to oil pressure. In a hydraulic actuation device, a variable resistance device for an oil pressure meter that changes the resistance value according to A hydraulic actuating device characterized in that the operating direction of the pressing portion for opening and closing the fuel pump switch is made to coincide with the movement axis direction of the movable body. (2) The hydraulically actuated device according to claim 1 of the utility model registration, characterized in that a pressure cancel device is disposed on the side of the fuel pump switch. (3) The hydraulically actuated device according to claim 1 of the utility model registration, characterized in that a fuel pump switch and a pressure cancel device are arranged in series.