JPH067342Y2 - 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] A hydraulic actuating device in which a fuel pump switch connected by an increase in hydraulic pressure and a variable resistance device for a hydraulic meter whose resistance value changes according to the hydraulic pressure are integrally incorporated in the same case is known. is there. In this variable resistance device, when the sliding electrode moves according to the oil pressure, the contact position with the resistor fixed in the case changes, so that the resistance value changes.

[Problems to be Solved by the Invention] Meanwhile, the hydraulic pressure supplied into the case for moving the sliding electrode pulsates with the rotation of the internal combustion engine. Therefore, the sliding electrode reciprocates in small steps, and the contact position with the resistor changes in small steps. As a result, the display of the hydraulic meter, for example, the pointer always vibrates in small steps, making it difficult to see the hydraulic meter. In addition, it is also known that the resistor is composed of a large number of parallel parts at a predetermined interval, but in this case, when the sliding electrode moves, it becomes non-contact with the resistor at a predetermined interval and Since a momentary interruption occurs where the value cannot be measured, this also causes unnecessary fluctuations in the resistance value.

Also, it is possible to reduce the wear of the resistor due to the sliding electrode,
It is extremely important for improving the durability of the entire device.

Therefore, the purpose of the present invention is to stabilize the display of the oil pressure meter,
At the same time, the purpose is to improve the wear resistance of the resistor.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a fuel pump switch that is turned on when the hydraulic pressure rises above a predetermined level and a sliding electrode that linearly moves according to the hydraulic pressure to reduce the resistance value. In a hydraulic operating device integrally provided with a variable resistance device for changing a hydraulic meter, a plurality of strip-shaped conductors parallel to each other in a direction orthogonal to the sliding direction of the sliding electrode are arranged in parallel at a predetermined interval, Moreover, a part of each strip conductor is adjacent to the sliding electrode in the sliding range and is bent obliquely so that the two are parallel to each other.
It is characterized in that the sliding electrode which is moving is always in contact with any one of the slanted portions, and a resistor connected to the strip-shaped conductor is provided outside the sliding range of the sliding electrode.

[Advantage of the Invention] The sliding electrode according to the present invention moves according to the hydraulic pressure and is always selected in any of the diagonal portions of the plurality of strip-shaped conductors arranged orthogonally to the moving direction according to the moving amount. Contact each other. Therefore, no instantaneous interruption occurs during the movement of the sliding electrode. Since the strip-shaped conductor is connected to the resistor provided outside the sliding range of the sliding electrode, the resistance value changes stepwise as shown in FIG. 8 in accordance with the hydraulic pressure.

As a result, the resistance value does not change unnecessarily with the movement of the sliding electrode, and even if the sliding electrode repeats reciprocating motion in small increments according to the pulsation of hydraulic pressure, the output resistance value does not change. It will be relatively stable.

Moreover, since the sliding electrode is moved linearly, and the slanting portions of the strip-shaped conductors on which it slides are provided so that adjacent ones are parallel to each other, compared to the case where the sliding electrode is moved in an arc shape. Arrangement of the strip conductor becomes easy.

Further, if the resistor is provided outside the sliding range of the sliding electrode, the resistor does not come into contact with the sliding electrode and wear by the sliding electrode is eliminated.

[Embodiment] FIGS. 1 to 8 show an embodiment of the present invention.

This hydraulic actuating device integrally incorporates a variable resistance device for a hydraulic meter and a fuel pump switch, which are actuated by hydraulic pressure into the same case 1. That is, a base 2 for attaching to a hydraulic circuit (not shown) is attached to one end of a metal-made cylindrical case 1. An oil passage 3 is formed in the base portion 2, and an oil passage 3 is narrowed in the middle to smooth the pulsation of the hydraulic oil. A diaphragm 4 is provided at the outlet of the oil passage 3 inside the case 1. further,
A movable body 5 made of resin is provided in the case 1 partitioned by the diaphragm 4, and can be moved in the case 1 in the left-right direction in the drawing by the diaphragm 4.

The movable body 5 has a bottomed cylindrical shape, and a central portion of a sliding electrode 7 having a substantially U-shaped side view and a narrow free end is attached to a boss portion 6 integrally formed on the bottom portion. There is. A known wire brush 7a is attached to the free end of the sliding electrode 7, as shown in FIG.

On the other hand, a resin immovable body 8 is fixedly housed in the center of the case 1. A protrusion 9 extending toward the boss 6 is formed at the center of the stationary body 8. As the wire brush 7a slides on the upper and lower surfaces of the protrusion 9,
The planar resistor 10 and the metal conductor 11 are supported.

The sheet resistor 10 and the metal conductor 11 are electrically connected to the bus bar terminals 14 and 15 by metal crimps 12 and 13, respectively, as shown in FIG. Note that FIG. 2 shows side surfaces of these in order to explain the relationship between the sliding electrode 7, the sheet resistor 10, and the metal conductor 11.

A space 8a for accommodating the fuel pump switch is formed in a portion of the immovable body 8 opposite to the protrusion 9. The fuel pump switch is a micro switch, and includes a reversing spring 17 for selectively energizing the movable contact 16 in either the opening direction or the closing direction, and the reversing spring 1.
The movable body 5 is moved from the side of the immovable body 8 to reverse 7
The movable contact 16 is connected to the fixed contact 19 by the reversing spring 17 when the pin 18 is provided so as to be able to move in and out and the fixed contact 19 and the like.

A coupler 20 is attached to the other end of the case 1, and a bellows 21 is provided between the coupler 20 and the immovable body 8. The bellows 21 communicates with the atmosphere through the atmosphere opening port 22 formed in the partition wall of the coupler 20, and isolates the coupler 20 from the inside of the case 1 to waterproof the fuel pump switch and the variable resistance device inside the case 1. Functions as a device. It also functions as an internal pressure adjusting device in the case 1 as the movable body 5 moves.

In addition, the terminals 23 to 25 protruding into the coupler 20
Among them, the terminals 23 and 24 are electrically connected to the fixed contact 19 and the movable contact 16, respectively, and the terminal 25 and the other terminal paired with this are not visible in the figure, but the bus bar terminals 14 and 15 are the other terminals. Is electrically connected to.

A return spring 2 having different strength is provided between the movable body 5 and the immovable body 8 via a retainer 26 having a substantially S-shaped cross section.
7 and 28 are stretched. The return spring 28 is a spring that is much weaker than the return spring 28, and the retainer 26 is moved to the right in the figure by the initial hydraulic pressure increase applied to the movable body 5 via the oil passage 3, and the pin 18 is moved to the space 8a. It is designed to be pushed inward to turn on the fuel pump switch. Thereafter, when the hydraulic pressure continues to rise, the diaphragm 4 and the movable body 5 move while compressing the return spring 27 in accordance with the increased amount, so that the sliding electrode 7 integrated with the movable body 5 also moves, and at the same time, the wire brush. 7a is a sheet resistor 10 and a metal conductor 11
It slides up to change the resistance value, and this change is displayed on a hydraulic meter (not shown).

FIGS. 3 to 5 show the detailed structure of the sheet-shaped resistor 10. The sheet-shaped resistor 10 has a conductor 30 integrated with the bus bar terminal 14 by caulking 12 via an insulating base 30. A section 31 is provided. The conductor portion 31 extends to the other end side along the long side of the base 30, and the surface thereof is covered with the insulator 32. The other end of the conductor 31 is connected to the end of the resistor 33 formed in a relatively wide area in parallel with the conductor 31. The resistor 33 is provided so as to cover the thin strip conductor 34 so as to be electrically connected thereto. A plurality of strip conductors 34 are orthogonal to the moving direction of the wire brush 7a, and are plural in the sliding range formed at the intersection of the moving range of the wire brush 7a indicated by reference symbol A and the contact width of the wire brush 7a indicated by reference symbol B. These are arranged in parallel at appropriate intervals (24 in this embodiment).

The resistor 33 is provided so as to be located outside the sliding range, and the strip-shaped conductor 34 within the sliding range is exposed so that the wire brush 7a can be slidably contacted. Also,
A part of the strip conductor 34 is formed obliquely within the contact width B.

These resistors 33 are made of a cermet-based material having relatively low wear resistance and are formed on an alumina (Al ₂ O ₃ ) -based base. The band-shaped conductor 34 is composed of a silver-paradium alloy having relatively good wear resistance.

On the other hand, the metal conductor 11 has a detailed structure as shown in FIGS. 6 and 7, and has a bus bar terminal 15 and an insulating base 40.
The upper conductor 41 is electrically connected by caulking 13. The conductor 41 extends to the other end side along the long side of the base 40, and the surface thereof is covered with an insulator 42.
The other end of the conductor 41 is connected to the end of a basic resistor 43 formed in a relatively wide area in parallel with the conductor 41. The basic resistor 43 is made of the same material as the resistor 33. Further, a conductor 44 is provided in the moving range of the wire brush 7a in parallel with the basic resistor 43, and the extension of the conductor 44 causes the wire brush 7a to be in a non-contact position at a position different from that of the basic resistor 43. The resistor 45 is provided, and the conductor 4
4 and the basic resistor 45, between the basic resistors 45 and 43, and between the basic resistor 43 and the conductor 41.
Electrically connected at 6, 47 and 48.

Next, the operation of this embodiment will be described. When the wire brush 7a slides on the sheet-shaped resistor 10 and the metal conductor 11, the electric circuit causes the bus bar terminal 14-the caulking 13-the conductor portion 41-the sheet-shaped resistor 33-the band-shaped conductor 34-the wire brush 7a-sliding. Electrode 7-Wire brush 7a-Conductor 44-Connecting portion 46-Basic resistor 45-Connecting portion 47-Basic resistor 43-Connecting portion 4
It is formed between 8-conductor 41-crimping 13-bus bar terminal 15.

Therefore, when the movable body 5 moves against the return spring 28 according to the hydraulic pressure supplied from the caulking 13, the wire brush 7 a causes the planar resistor 10 and the metal conductor 1 to move.
From the position of each start line 1 of No. 1, slide within each movement range A of FIGS. 3 and 6. At this time, the wire brush 7
Even if a is located in the middle of the adjacent strip-shaped conductors 34, since each strip-shaped conductor 34 is partially slanted, it is always connectable to one of the strip-shaped conductors 34.

Therefore, since the wire brush 7a is always and selectively brought into sliding contact with the individual strip conductors 34, there is no momentary interruption due to the movement of the wire brush 7a, so that unnecessary resistance value fluctuations are eliminated and the resistor 33 The resistance value at changes in a stepwise manner as shown in the graph of FIG. Therefore, even if the hydraulic pressure supplied from the oil passage 3 pulsates, the output of the resistance value does not immediately respond to this pulsation and changes in a stepwise manner. Therefore, the display of the hydraulic pressure level does not change in small steps due to the pulsation of the hydraulic pressure, which makes it extremely easy to see.

In addition, since the wire brush 7a is moved linearly and the slanting portions of the strip-shaped conductor 34 on which the wire brush 7a slides are provided so that adjacent ones are parallel to each other, when the sliding electrode is moved in an arc shape, , The strip conductors 34 must be arranged radially, and the sliding electrodes can always be kept in contact with one of the strip conductors 34 unless the adjacent interval between the strip conductors 34 is slightly changed. Since it is eliminated, high precision is required for the arrangement of the strip conductors 34, which makes manufacturing difficult. In contrast to this, in this embodiment, the band-shaped conductor 34 can be easily arranged, and the mass productivity is high.

Moreover, since the wire brush 7a does not come into direct contact with the resistor 33, the basic resistor 43, and the resistor 45 formed of a material having relatively poor wear resistance, the wear resistance is significantly improved. Improve to.

The basic resistors 43 and 45 on the metal conductor 11 side are
Even when the wire brush 7a is on the start line 1,
This is for giving a constant basic resistance value shown by reference character C in FIG.

[Advantage of the Invention] The sliding electrode according to the present invention moves linearly on a plurality of strip-shaped conductors arranged orthogonally to the moving direction according to hydraulic pressure, and slides a part of each strip-shaped conductor on the sliding electrode. In the moving range, the adjacent electrodes were bent at an angle so that they were parallel to each other, and the moving sliding electrode was always brought into contact with one of the oblique portions. Therefore, since the sliding electrode is always in contact with any diagonal portion of the plurality of strip conductors during movement,
No momentary interruption during movement.

As a result, the resistance value does not change unnecessarily with the movement of the sliding electrode, and the resistance value can be changed stepwise in spite of the pulsation of the hydraulic pressure. The display can be made easy to see.

Moreover, since the sliding electrode is moved linearly, and the slanting portions of the strip-shaped conductors on which it slides are provided so that adjacent ones are parallel to each other, compared to the case where the sliding electrode is moved in an arc shape. Arrangement of the strip conductor becomes easy.

Moreover, by connecting this strip-shaped conductor to the resistor provided outside the sliding range of the sliding electrode, the resistor is brought into non-contact with the sliding electrode, so that the sliding electrode does not wear the resistor and the device The durability of can be dramatically improved.

[Brief description of drawings]

1 to 8 show an embodiment, FIG. 1 is a longitudinal sectional view of a hydraulic operating device, FIG. 2 is a side view of an essential part, FIG. 3 is a plan view of the essential part, and FIG. Fig. 3 is a sectional view taken along the line IV-IV, Fig. 5 is a partially enlarged view of the main part, Fig. 6 is a plan view of the main part, and Fig. 7 is the sixth view.
FIG. 8 is a sectional view taken along the line VII-VII, and FIG. 8 is a graph showing changes in resistance value. (Explanation of Codes) 1 ... Case, 2 ... Base, 7 ... Sliding electrode, 10 ... Sheet resistor, 11 ... Metal conductor, 43 ... Resistor, 44 ... Strip conductor,
43, 45 ... Basic resistor.

Claims (1)

[Scope of utility model registration request] 1. A fuel pump switch that is turned on when the hydraulic pressure rises above a predetermined level, and a variable resistance device for a hydraulic meter that changes a resistance value by a sliding electrode that linearly moves according to the hydraulic pressure. In the hydraulic actuator, a plurality of strip conductors parallel to each other in a direction orthogonal to the sliding direction of the sliding electrode are arranged in parallel at a predetermined interval, and a part of each strip conductor slides on the sliding electrode. Bending diagonally so that adjacent ones within the range are parallel to each other, and the sliding electrode which is moving to any one of the diagonal portions is always in contact, and a resistor connected to the strip conductor is connected to the sliding electrode. A hydraulic actuating device characterized by being provided outside the sliding range.