WO2016121104A1 - Pressure switch, and device for controlling hydraulic equipment - Google Patents

Pressure switch, and device for controlling hydraulic equipment Download PDF

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Publication number
WO2016121104A1
WO2016121104A1 PCT/JP2015/052691 JP2015052691W WO2016121104A1 WO 2016121104 A1 WO2016121104 A1 WO 2016121104A1 JP 2015052691 W JP2015052691 W JP 2015052691W WO 2016121104 A1 WO2016121104 A1 WO 2016121104A1
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WO
WIPO (PCT)
Prior art keywords
spool
chamber
pressure switch
hole
pressure
Prior art date
Application number
PCT/JP2015/052691
Other languages
French (fr)
Japanese (ja)
Inventor
卓馬 西村
山口　英治
加藤　雅也
Original Assignee
株式会社小松製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社小松製作所 filed Critical 株式会社小松製作所
Priority to PCT/JP2015/052691 priority Critical patent/WO2016121104A1/en
Publication of WO2016121104A1 publication Critical patent/WO2016121104A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/38—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by piston and cylinder

Definitions

  • the present invention relates to a pressure switch and a hydraulic equipment control device including the pressure switch.
  • the pressure switch has a spool housed in the housing.
  • the housing has a pressure switch chamber and a pressure receiving chamber connected to the pressure switch chamber via a spool hole.
  • the spool includes a spool body that is slidably inserted into the spool hole, and a detection pin disposed in the pressure switch chamber.
  • the present invention has been made in view of the above-described problems, and an object thereof is to provide a pressure switch capable of suppressing the adhesion of hydraulic oil to a detection pin and a hydraulic device control device including the pressure switch.
  • the pressure switch includes a housing and a spool.
  • the housing includes a pressure switch chamber, a drain chamber connected to the pressure switch chamber via the first spool hole and capable of discharging the fluid, and a pressure receiving chamber connected to the drain chamber via the second spool hole and filled with the fluid.
  • the spool includes a spool body that is slidably inserted into the first spool hole and the second spool hole, and a detection pin that is attached to the spool body and disposed in the pressure switch chamber.
  • the drain chamber is provided between the pressure switch chamber and the pressure receiving chamber, even if hydraulic oil leaks from the pressure receiving chamber to the drain chamber through the second spool hole.
  • the hydraulic oil leaking into the drain chamber can be prevented from leaking into the pressure switch chamber.
  • the adhesion of the hydraulic oil to the detection pin arranged in the pressure switch chamber is suppressed, so that corrosion and poor conduction of the detection pin can be suppressed.
  • the pressure switch according to the second aspect relates to the first aspect, wherein the first spool hole has a first opening formed in the drain chamber, and the spool main body is configured when the pressure receiving chamber is filled with fluid. It has the 1st flange part which covers the outer edge of the 1st opening.
  • the pressure switch according to the second aspect since the first spool hole is blocked by the first flange portion, it is possible to further suppress the hydraulic oil leaking to the drain chamber from leaking to the pressure switch chamber.
  • a pressure switch according to a third aspect relates to the first or second aspect, wherein the first spool hole has a second opening formed in the pressure switch chamber, and the spool body fills the pressure receiving chamber with fluid. If not, a second flange portion is provided to cover the outer edge of the second opening.
  • the pressure switch according to the third aspect since the first spool hole is blocked by the second flange portion, it is possible to further suppress the hydraulic oil leaking to the drain chamber from leaking to the pressure switch chamber.
  • a pressure switch according to a fourth aspect relates to the third aspect, wherein the first spool hole is continuous with the first hole and the pressure switch chamber side of the first hole, and has a larger diameter than the first hole.
  • the spool body has a seal portion that is inserted into the second hole when the pressure receiving chamber is not filled with fluid.
  • the pressure switch according to the fourth aspect since the first spool hole is blocked by the seal portion, it is possible to further suppress the hydraulic oil leaking to the drain chamber from leaking to the pressure switch chamber.
  • a pressure switch according to a fifth aspect relates to the second aspect, wherein the second spool hole has a third opening formed in the drain chamber, and the first flange portion has the pressure receiving chamber filled with fluid. If not, cover the outer edge of the third opening.
  • the hydraulic oil leaks from the pressure receiving chamber to the drain chamber until the pressure receiving chamber is filled with fluid. This can be suppressed.
  • a pressure switch according to a sixth aspect relates to the second aspect, and the housing has a mounting portion including a first spool hole and a pressure switch chamber, and a housing body including a pressure receiving chamber and a second spool hole. .
  • the attachment portion is attached to the housing body.
  • the spool and the housing can be assembled smoothly even when the spool body is provided with the first flange portion.
  • a pressure switch according to a seventh aspect relates to the sixth aspect, wherein the spool body is slidably inserted into the first spool hole and the second spool hole. And a second spool portion.
  • the first flange portion is provided on the second spool portion.
  • the pressure switch according to the seventh aspect since it can be assembled to the housing body in the order of the second spool part ⁇ the attachment part ⁇ the first spool part ⁇ the third spool part, the assembling work can be smoothly performed.
  • the pressure switch according to an eighth aspect relates to the sixth aspect, wherein the spool body is slidably inserted into the first spool hole and the second spool hole. And a second spool portion.
  • the first flange portion is provided on the first spool portion.
  • the pressure switch according to the eighth aspect since it can be assembled to the housing body in the order of the second spool part ⁇ the first spool part ⁇ the attachment part ⁇ the third spool part, the assembling work can be smoothly performed.
  • a pressure switch according to a ninth aspect relates to the sixth aspect, wherein the first spool hole has a second opening formed in the pressure switch chamber, and the spool body is slidably inserted into the first spool hole.
  • the third spool portion includes a second flange portion that covers the outer edge of the second opening when the pressure receiving chamber is not filled with fluid. The third spool portion is attached to the first spool portion.
  • the assembling work can be performed more smoothly.
  • the pressure switch according to a tenth aspect relates to the first aspect, in which the second spool hole has a third opening formed in the drain chamber, and the spool body has a pressure receiving chamber not filled with fluid. Has a third flange portion covering the outer edge of the third opening.
  • the hydraulic oil leaks from the pressure receiving chamber to the drain chamber before the pressure receiving chamber is filled with fluid. This can be suppressed.
  • a hydraulic equipment control device is a hydraulic equipment control device for controlling the supply of hydraulic oil to the hydraulic equipment, and includes the pressure switch according to any one of claims 1 to 10.
  • a pressure switch capable of suppressing the adhesion of hydraulic oil to the detection pin and a hydraulic device control device including the pressure switch.
  • Sectional drawing which shows the structure of the hydraulic equipment control apparatus which concerns on 1st Embodiment.
  • First Embodiment (Configuration of Hydraulic Equipment Control Device 100) A configuration of the hydraulic device control apparatus 100 to which the pressure switch 30 according to the first embodiment is applied will be described.
  • the hydraulic equipment control device 100 controls the supply of hydraulic oil (an example of fluid) to the hydraulic equipment in accordance with a command current from the control device 200.
  • hydraulic equipment include, but are not limited to, hydraulic clutches and hydraulic brakes.
  • FIG. 1 is a cross-sectional view showing the configuration of the hydraulic device control apparatus 100.
  • FIG. 1 shows a scene where hydraulic oil is not supplied to the hydraulic equipment.
  • the hydraulic device control apparatus 100 includes an electromagnetic control valve 10, a pressure control valve 20, a pressure switch 30, and a housing 40.
  • an electromagnetic control valve 10 a pressure control valve 20, a pressure switch 30, and a housing 40.
  • the configurations of the electromagnetic control valve 10, the pressure control valve 20, the pressure switch 30, and the housing 40 will be sequentially described.
  • the housing 40 constitutes a part of each of the pressure control valve 20, the electromagnetic control valve 10, and the pressure switch 30, the configuration of the housing 40 is the electromagnetic control valve 10, the pressure control valve 20, and the pressure switch 30. This will be explained together with the explanation.
  • Electromagnetic control valve 10 The electromagnetic control valve 10 includes a proportional solenoid 11, a connecting member 12, a valve seat body 13, a valve body 14, an attachment port 15, a valve seat body accommodation chamber 16, and a drain port 17.
  • the attachment port 15, the valve seat body accommodation chamber 16 and the drain port 17 are formed inside the housing 40.
  • the proportional solenoid 11 has a plunger 11 a that contacts the valve body 14.
  • the proportional solenoid 11 is connected to the control device 200.
  • the proportional solenoid 11 advances and retracts the plunger 11 a according to the command current from the control device 200.
  • the connecting member 12 is attached to the attachment port 15.
  • the connecting member 12 connects the proportional solenoid 11 and the valve seat body 13.
  • the connecting member 12 is formed with a plunger insertion hole 12a through which the plunger 11a is inserted.
  • the valve seat body 13 is accommodated in the valve seat body accommodating chamber 16.
  • the valve seat body 13 is formed with a plunger insertion hole 13a, a valve body accommodating chamber 13b, a pilot recess 13c, a first drain channel 13d, and a second drain channel 13e.
  • the tip of the plunger 11a is inserted into the plunger insertion hole 13a.
  • the valve body storage chamber 13b is connected to the plunger insertion hole 13a.
  • the valve body housing chamber 13b houses the valve body 14.
  • the valve body storage chamber 13 b has a valve seat surface 13 ⁇ / b> S that faces the valve body 14.
  • the valve body storage chamber 13b is connected to the drain port 17 via the first drain channel 13d.
  • the pilot recess 13c is connected to the valve body storage chamber 13b via the second drain channel 13e.
  • the second drain channel 13e opens to the valve seat surface 13S of the valve body storage chamber 13b.
  • the pilot recess 13c opens to a pilot chamber 25 of the pressure control valve 20 described later.
  • valve element 14 is accommodated in the valve element accommodating chamber 13 b of the valve seat element 13.
  • the valve body 14 is in contact with the tip of the plunger 11a, and moves in the valve body housing chamber 13b in accordance with the advance / retreat of the plunger 11a.
  • the valve body 14 is formed in the spherical shape, it is not restricted to this.
  • the attachment port 15 is a recess formed on the outer surface of the housing 40.
  • the connecting member 12 is attached to the attachment port 15.
  • the attachment port 15 continues to the valve seat body accommodation chamber 16.
  • the valve seat body accommodation chamber 16 accommodates the valve seat body 13.
  • the valve seat body accommodating chamber 16 is connected to the drain port 17.
  • the drain port 17 is connected to a hydraulic oil tank (not shown).
  • the pressure control valve 20 includes a spool 21, an input chamber 22, a valve chamber 23, a drain chamber 24, a pilot chamber 25, an input port 26, an output port 27, a drain port 28, and a pilot port 29.
  • the input chamber 22, the valve chamber 23, the drain chamber 24, the pilot chamber 25, the input port 26, the output port 27, the drain port 28 and the pilot port 29 are formed inside the housing 40.
  • the spool 21 faces the electromagnetic control valve 10.
  • the spool 21 is movable with respect to the electromagnetic control valve 10.
  • the spool 21 includes a spool body 21a, a feedback chamber 21b, a communication path 21c, a spring 21d, and a pilot recess 21e.
  • the spool body 21 a is disposed so as to penetrate the pilot chamber 25, the drain chamber 24, the valve chamber 23, and the input chamber 22 formed in order from the electromagnetic control valve 10 side.
  • the feedback chamber 21b communicates with the valve chamber 23 via the communication path 21c.
  • a spring 21d is accommodated in the feedback chamber 21b.
  • the spring 21d biases the spool body 21a toward the electromagnetic control valve 10 side.
  • the pilot recess 21 e opens into the pilot chamber 25.
  • the pilot recess 21 e faces the pilot recess 13 c of the electromagnetic control valve 10.
  • the input room 22 is connected to the input port 26. Hydraulic fluid pumped from the oil pump is supplied to the input chamber 22 via the input port 26.
  • Hydraulic fluid pumped from the oil pump is supplied to the input chamber 22 via the input port 26.
  • the input chamber 22 is connected to the valve chamber 23, and hydraulic oil flows from the input chamber 22 into the valve chamber 23.
  • the hydraulic oil that has flowed into the valve chamber 23 from the input chamber 22 is supplied to the hydraulic equipment via the output port 27.
  • the valve chamber 23 is connected to the drain chamber 24, and hydraulic oil flows from the valve chamber 23 into the drain chamber 24.
  • the hydraulic oil that has flowed into the drain chamber 24 from the valve chamber 23 is discharged to the hydraulic oil tank via the drain port 28.
  • the pilot room 25 is connected to the input room 22 via the pilot port 29.
  • the hydraulic oil flows into the pilot port 29 from the input chamber 22 through the screw plug 29a. Hydraulic fluid flows into the pilot chamber 25 from the pilot port 29.
  • the pressure switch 30 includes a spool 31, a pressure switch chamber 32, a drain chamber 33, a pressure receiving chamber 34, and an output unit 35.
  • the pressure switch chamber 32, the drain chamber 33, and the pressure receiving chamber 34 are formed inside the housing 40.
  • the spool 31 faces the output unit 35.
  • the spool 31 is movable with respect to the output unit 35.
  • the spool 31 includes a spool body 31a, a detection pin 31b, and a spring 31c.
  • the spool body 31a is disposed so as to penetrate the pressure switch chamber 32, the drain chamber 33, and the pressure receiving chamber 34 that are sequentially formed from the output portion 35 side.
  • the detection pin 31b is attached to the end of the spool body 31a on the output unit 35 side.
  • the detection pin 31 b is disposed in the pressure switch chamber 32.
  • the spring 31c urges the spool body 31a to the side opposite to the output unit 35.
  • the spring 31 c is disposed in the pressure switch chamber 32.
  • the pressure switch chamber 32 is arranged on the output unit 35 side with the drain chamber 33 as a reference. In the pressure switch chamber 32, a detection pin 31b and an output pin 35c are arranged. Since the hydraulic oil leakage from the drain chamber 33 to the pressure switch chamber 32 is suppressed, the pressure switch chamber 32 is a sealed space isolated from the drain chamber 33.
  • the drain chamber 33 is disposed between the pressure switch chamber 32 and the pressure receiving chamber 34.
  • the drain chamber 33 is connected to the drain port 17 and can discharge hydraulic oil.
  • the pressure receiving chamber 34 is filled with hydraulic oil, the hydraulic oil leaks from the pressure receiving chamber 34 into the drain chamber 33.
  • the hydraulic oil leaking into the drain chamber 33 is discharged to the hydraulic oil tank through the drain port 17.
  • the pressure receiving chamber 34 is disposed on the opposite side of the output unit 35 with respect to the drain chamber 33.
  • the pressure receiving chamber 34 is connected to the output port 27 and can be filled with hydraulic oil.
  • the hydraulic oil flowing out from the valve chamber 23 of the pressure control valve 20 to the output port 27 is supplied to the hydraulic device and flows into the pressure receiving chamber 34.
  • the pressure receiving chamber 34 is also filled with hydraulic oil.
  • the hydraulic pressure moves the spool body 31a to the output portion 35 side against the spring 31c.
  • the output unit 35 includes a fixed unit 35a, a support unit 35b, and an output pin 35c.
  • the fixing portion 35a is in close contact with the housing 40 so that the pressure switch chamber 32 is kept airtight.
  • the support part 35b is fixed to the fixing part 35a.
  • the support part 35b supports the output pin 35c.
  • the output pin 35 c is exposed to the pressure switch chamber 32.
  • the output pin 35 c faces the detection pin 31 b of the spool 31. When the spool body 31a moves to the output unit 35 side, the detection pin 31b contacts the output pin 35c.
  • the output pin 35c is electrically connected to the control device 200. When the detection pin 31b comes into contact with the output pin 35c, the control device 200 detects that the hydraulic equipment is filled with hydraulic oil.
  • pilot pressure is generated in the pilot chamber 25, and the spool body 21a moves away from the electromagnetic control valve 10 against the spring 21d. Therefore, the input chamber 22 and the valve chamber 23 are connected, and the valve chamber 23 and the drain are connected. Chamber 24 is shut off. As a result, the hydraulic oil pumped from the hydraulic pump flows into the output port 27 via the input chamber 22 and the valve chamber 23.
  • the pressure receiving chamber 34 of the pressure switch 30 is also filled with hydraulic oil, and the spool body 31a of the spool 31 moves toward the output portion 35 against the spring 31c.
  • the control device 200 detects that hydraulic oil has been filled in the hydraulic equipment.
  • the pressure switch 30 includes the spool 31, the output unit 35, and the housing 40.
  • the detailed configuration of the spool body 31a and the housing 40 will be mainly described.
  • FIG. 2 to 4 are enlarged cross-sectional views showing the configuration of the hydraulic switch 30.
  • FIG. FIG. 2 shows a scene where hydraulic oil is not filled in the hydraulic equipment
  • FIG. 3 shows a scene where hydraulic oil is filled in the hydraulic equipment.
  • FIG. 4 shows a state in which the spool 31 is omitted.
  • the housing 40 includes an attachment portion 41 and a housing body 42.
  • a pressure switch chamber 32 is formed in the attachment portion 41, and a pressure receiving chamber 34 is formed in the housing body 42.
  • a drain chamber 33 is formed between the attachment portion 41 and the housing body 42. The configurations of the pressure switch chamber 32, the drain chamber 33, and the pressure receiving chamber 34 are as described above.
  • the mounting portion 41 has a first spool hole 41 a that is continuous with the drain chamber 33 and the pressure switch chamber 32.
  • the housing main body 42 has a second spool hole 42 a continuous with the pressure receiving chamber 34 and the drain chamber 33.
  • the first spool hole 41a has a first opening T1 formed in the drain chamber 33 and a second opening T2 formed in the pressure switch chamber 32, as shown in FIG.
  • the first opening T1 is formed in the first inner surface S1 of the drain chamber 33 on the pressure switch chamber 32 side.
  • the second opening T2 is formed in the second inner surface S2 of the pressure switch chamber 32 on the drain chamber 33 side.
  • the first spool hole 41a includes a first hole R1 and a second hole R2.
  • the first hole R1 extends from the first opening T1 toward the pressure switch chamber 32.
  • the first hole R1 is continuous with the second hole R2.
  • the second hole R2 extends from the first hole R1 to the second opening T2.
  • the second hole R2 has a larger diameter than the first hole R1. That is, the diameter of the first spool hole 41a is enlarged on the pressure switch chamber 32 side.
  • the second spool hole 42a has a third opening T3 formed in the drain chamber 33 and a fourth opening T4 formed in the pressure receiving chamber 34, as shown in FIG.
  • the third opening T3 is formed in the third inner surface S3 of the drain chamber 33 on the pressure receiving chamber 34 side.
  • the fourth opening T4 is formed in the fourth inner surface S4 of the pressure receiving chamber 34 on the drain chamber 33 side.
  • the second spool hole 42a has a uniform inner diameter.
  • the spool body 31a is slidably inserted into the first spool hole 41a and the second spool hole 42a.
  • the spool body 31 a includes a first spool part 51, a second spool part 52, and a third spool part 53.
  • the first spool portion 51 is slidably inserted into the first spool hole 41a.
  • the first spool portion 51 includes a first main body portion 51a and a seal portion 51b.
  • the first main body 51a is formed in a cup shape.
  • the first main body 51a has a spring chamber 51c that opens to the third spool portion 53 side (that is, the pressure switch chamber 32 side).
  • a spring 51d that presses the detection pin 31b against the third spool portion 53 is accommodated in the spring chamber 51c.
  • the first main body 51a is in close contact with the inner peripheral surface of the first hole R1 to such an extent that leakage of hydraulic oil is suppressed.
  • the seal portion 51b is provided at an end portion on the third spool portion 53 side of the first main body portion 51a.
  • the seal portion 51b is formed in an annular shape (that is, a flange shape).
  • the seal portion 51b is inserted into the second hole portion R2 of the first spool hole 41a when the pressure receiving chamber 34 is not filled with hydraulic oil, and the first spool hole 41a One hole R1 is closed.
  • the seal 51b only needs to block the first hole R1, and the shape and size thereof are not particularly limited. Therefore, the seal portion 51b may not be in close contact with the inner peripheral surface of the second hole portion R2.
  • the second spool portion 52 is slidably inserted into the second spool hole 42a.
  • the second spool portion 52 has a second main body portion 52a and a first flange portion 52b.
  • the 2nd main-body part 52a is formed in a column shape.
  • the second main body 52a is in close contact with the inner peripheral surface of the second spool hole 42a to such an extent that leakage of hydraulic oil is suppressed.
  • the first flange portion 52 b is disposed in the drain chamber 33.
  • the 1st flange part 52b is provided in the edge part by the side of the drain chamber 33 among the 2nd main-body parts 52a.
  • the first flange portion 52b is formed in an annular shape (that is, a flange shape).
  • the first flange portion 52b contacts the first inner surface S1 of the drain chamber 33 and covers the outer edge of the first opening T1 when the pressure receiving chamber 34 is filled with hydraulic oil.
  • the first spool hole 41a is closed by the first flange portion 52b.
  • the first flange portion 52 b contacts the third inner surface S ⁇ b> 3 of the drain chamber 33 when the pressure receiving chamber 34 is not filled with hydraulic oil.
  • the outer edge of the third opening T3 is covered.
  • the second spool hole 42a is closed by the first flange portion 52b.
  • the third spool portion 53 is disposed in the pressure switch chamber 32.
  • the third spool portion 53 is attached to the first spool portion 51.
  • the third spool portion 53 has a third main body portion 53a and a second flange portion 53b.
  • the third main body 53a is formed in a cylindrical shape.
  • the detection pin 31b is inserted through the third main body 53a.
  • the second flange portion 53 b is disposed in the pressure switch chamber 34.
  • the second flange portion 53b is provided at the end of the third main body portion 53a on the drain chamber 33 side.
  • the second flange portion 53b is formed in an annular shape (that is, a flange shape).
  • the second flange portion 53b is biased to the opposite side of the output portion 35 by the spring 31c.
  • the second flange portion 53b contacts the second inner surface S2 of the pressure switch chamber 32 and covers the outer edge of the second opening T2 when the pressure receiving chamber 34 is not filled with hydraulic fluid. As a result, the first spool hole 41a is closed by the second flange portion 53b.
  • the pressure switch 30 includes a housing 40 and a spool 31.
  • the housing 40 includes a pressure switch chamber 32, a drain chamber 33 connected to the pressure switch chamber 32 via the first spool hole 41a, and a pressure receiving chamber 34 connected to the drain chamber 33 via the second spool hole 42a.
  • the spool 31 includes a spool body 31a that is slidably inserted into the first spool hole 41a and the second spool hole 42a, and a detection pin 31b that is disposed in the pressure switch chamber 32.
  • the drain chamber 33 is provided between the pressure switch chamber 32 and the pressure receiving chamber 32, even if the hydraulic oil leaks from the pressure receiving chamber 34 to the drain chamber 33 through the second spool hole 42a, It is possible to avoid the hydraulic oil leaking to the chamber 33 from leaking to the pressure switch chamber 32. As a result, the adhesion of hydraulic oil to the detection pin 31b disposed in the pressure switch chamber 34 is suppressed, so that corrosion of the detection pin 31b and poor conduction between the detection pin 31b and the output pin 35c can be suppressed.
  • the spool body 31a has a first flange portion 52b that covers the outer edge of the first opening T1 of the first spool hole 41a when the pressure receiving chamber 34 is filled with fluid.
  • the spool body 31a has a second flange portion 53b that covers the outer edge of the second opening T2 of the first spool hole 41a when the pressure receiving chamber 34 is not filled with fluid.
  • the spool body 31a includes a seal portion 51b that is inserted into the second hole portion R2 of the first spool hole 41a when the pressure receiving chamber 34 is not filled with fluid.
  • the first flange portion 52b covers the outer edge of the third opening T3 of the second spool hole 42a when the pressure receiving chamber 34 is not filled with fluid.
  • the hydraulic oil is prevented from leaking from the pressure receiving chamber 34 to the drain chamber 33 until the pressure receiving chamber 34 is filled with fluid. it can.
  • the housing 40 includes a mounting portion 41 including the first spool hole 41a and the pressure switch chamber 32, and a housing body 42 including the pressure receiving chamber 34 and the second spool hole 42a.
  • the attachment portion 41 is attached to the housing main body 42. Therefore, even if the spool body 31a is provided with the first flange portion 52b, the spool 31 and the housing 40 can be assembled smoothly.
  • the first flange portion 52 b is provided in the second spool portion 52. Accordingly, since the assembly can be performed in the order of the second spool portion 52 ⁇ the attachment portion 41 ⁇ the first spool portion 51 ⁇ the third spool portion 53, the assembly work can be smoothly performed.
  • FIG. 5 shows a scene where hydraulic oil is not filled in the hydraulic equipment
  • FIG. 6 shows a scene where hydraulic oil is filled in the hydraulic equipment.
  • the spool body 31a ' is slidably inserted into the first spool hole 41a and the second spool hole 42a.
  • the spool body 31a ' includes a first spool portion 51', a second spool portion 52 ', and a third spool portion 53'.
  • the first spool part 51 'does not have the seal part 51b but has the first flange part 51e.
  • the first flange portion 51 e is disposed in the drain chamber 33.
  • the first flange portion 51e is provided at the end of the first spool portion 51 'on the pressure receiving chamber 34 side.
  • the first flange portion 51e is formed in an annular shape (that is, a flange shape).
  • the first flange portion 51e contacts the first inner surface S1 of the drain chamber 33 and covers the outer edge of the first opening T1 when the pressure receiving chamber 34 is filled with hydraulic oil (see FIGS. 4 and 6).
  • the first spool hole 41a is closed by the first flange portion 51e.
  • the first flange portion 51e of the first spool portion 51 functions in the same manner as the first flange portion 52b of the second spool portion 52 according to the first embodiment.
  • the second spool portion 52 ' has a third flange portion 52c.
  • the third flange portion 52c contacts the third inner surface S3 of the drain chamber 33 and covers the outer edge of the third opening T3 when the pressure receiving chamber 34 is not filled with hydraulic oil.
  • the second spool hole 42a is closed by the third flange portion 52c.
  • the third flange portion 52c closes the first spool hole 41a when the pressure receiving chamber 34 is filled with hydraulic oil. There is no need.
  • the third spool portion 53 ' has the same configuration and function as the third spool portion 53 according to the first embodiment.
  • the third spool portion 53 ' is a separate member from the first spool portion 51'.
  • the third spool portion 53 ′ is attached to the first spool portion 51 ′ so as to sandwich the attachment portion 41 of the housing 40.
  • the first flange portion 51e is provided in the first spool portion 51 ′.
  • the second spool portion 52 ', the first spool portion 51', the attachment portion 41, and the third spool portion 53 ' can be assembled in this order, the assembling work can be performed smoothly.
  • the third spool portion 53 ′ is attached to the first spool portion 51 ′ so as to sandwich the attachment portion 41 of the housing 40.
  • the assembly operation can be performed more smoothly.
  • the second spool portion 52 includes a third flange portion 52c that covers the outer edge of the third opening T3 of the second spool hole 42a when the pressure receiving chamber 34 is not filled with fluid.
  • FIG. 7 is an enlarged cross-sectional view showing the configuration of the hydraulic switch 30 ′′.
  • FIG. 7 shows a scene in which hydraulic oil is not filled in the hydraulic equipment.
  • the spool body 31a "includes a third spool portion 53 and a fourth spool portion 54.
  • the third spool portion 53 has the same configuration and function as the third spool portion 53 according to the first embodiment.
  • the fourth spool portion 54 is a cylindrical body having a spring chamber 51c formed on the end face.
  • the fourth spool portion 54 is slidably inserted into the first spool hole 41a and the second spool hole 42a.
  • the fourth spool portion 54 has a configuration and a function in which the first spool portion 51 and the second spool portion 52 according to the first embodiment are combined.
  • the fourth spool portion 54 does not have the first flange portion 52b or the seal portion 51b according to the first embodiment. Therefore, the pressure switch chamber 32 and the drain chamber 33 are isolated only when the fourth spool portion 54 comes into close contact with the inner peripheral surface of the first spool hole 41a.
  • housing 40 according to the third embodiment is not provided with the attachment portion 41.
  • the spool main body 31a ′′ according to the third embodiment is slidably inserted into the first spool hole 41a and the second spool hole 42a. Therefore, the spool body 31a ′′ passes through the second spool hole 42a from the pressure receiving chamber 34. Even if the hydraulic oil leaks into the drain chamber 33, it can be avoided that the hydraulic oil leaked into the drain chamber 33 leaks into the pressure switch chamber 32.
  • the spool body 31a ′′ is formed in a cylindrical shape and is not provided with a first flange. Therefore, the spool body 31a ′′ can be inserted into the first spool hole 41a and the second spool hole 42a from the outside. There is no need to provide the mounting portion 41 in the housing 40. Accordingly, the overall configuration of the pressure switch 30 ′′ can be simplified.
  • the spool body 31a has the first flange portion 52b and the second flange portion 53b. However, the spool body 31a may have only one or both of them. It does not have to be.
  • the first flange portion 52 b is provided in the second spool portion 52, but may be provided in the first spool portion 51.
  • the second flange portion 53 b is provided in the third spool portion 53, but may be provided in the first spool portion 51.
  • the first spool portion 51 has the seal portion 51b, but may not have this. In this case, it is not necessary to provide the second hole R2 in the first spool hole 41a.
  • the first spool portion 51 and the second spool portion 52 are separate members. However, when the spool body 31a does not have the first flange portion 52b, these are regarded as one member. can do.
  • the spool body 31a ′ has the first flange portion 51e, the second flange portion 53b, and the third flange portion 52c, but has only one or two of them. It does not have to be all.
  • the first flange portion 51e is provided in the first spool portion 51 ', but may be provided in the second spool portion 52'. At this time, the first flange portion 51e may be formed integrally with the third flange portion 52c.
  • the second flange portion 53b is provided in the third spool portion 53 ', but may be provided in the first spool portion 51'.
  • first spool portion 51 ′ and the second spool portion 52 ′ are separate members, but the spool body 31a ′ must have the first flange portion 51e and the third flange portion 52c. In this case, these can be made into one member.
  • the spool main bodies 31a and 31a ′ have a fourth flange portion that covers the outer edge of the fourth opening T4 of the second spool hole 42a when the pressure receiving chamber 34 is filled with fluid. You may have. As described above, the second spool hole 42a is blocked by the fourth flange portion, so that the hydraulic oil filled in the pressure receiving chamber 34 can be further prevented from leaking into the drain chamber 33.
  • the third spool portion 53 has the second flange portion 53b, and no flange is provided on the fourth spool portion 54.
  • the second flange portion 53b or the fourth spool portion 54 is not provided. May be provided. Even in this case, it is not necessary to provide the attachment portion 41 in the housing 40.
  • the pressure switch 30 is applied to the hydraulic device control device 100 including the electromagnetic control valve 10 and the pressure control valve 20, but the electromagnetic control valve 10 and the pressure control valve 20 include Various known configurations can be employed.
  • examples of general electromagnetic control valves and pressure control valves are disclosed in Japanese Patent Application Laid-Open Nos. 2001-343032, 2009-250392, 2011-169439, and 2011-165415.
  • Pressure switch 31 Spool 31a Spool main body 31b Detection pin 32 Pressure switch chamber 33 Drain chamber 34 Pressure receiving chamber 40 Housing 41 Mounting portion 41a First spool hole T1 First opening T2 Second opening 42 Housing main body 42a Second spool hole T3 Third Opening T4 Fourth opening 51 First spool portion 51a First body portion 51b Seal portion 51e First flange portion 52 Second spool portion 52a Second body portion 52b First flange portion 52c Third flange portion 53 Third spool portion 53a First 3 body part 53b 2nd flange part

Abstract

A pressure switch (30) is provided with a housing (40) and a spool (31). The housing (40) has a pressure switch chamber (32), a drain chamber (33) which connects to the pressure switch chamber (32) through a first spool hole (41a), and a pressure-receiving chamber (34) which connects to the drain chamber (33) through a second spool hole (42a). The spool (31) has: a spool body (31a) which is inserted in a slidable manner into the first spool hole (41a) and the second spool hole (42a); and a detection pin (31b) which is disposed within the pressure switch chamber (32).

Description

圧力スイッチ及び油圧機器制御装置Pressure switch and hydraulic equipment control device
　本発明は、圧力スイッチ及びそれを備える油圧機器制御装置に関する。 The present invention relates to a pressure switch and a hydraulic equipment control device including the pressure switch.
　従来、油圧式クラッチや油圧式ブレーキなどの油圧機器への作動油の供給を制御する油圧機器制御装置が広く用いられている。また、油圧機器に作動油が充填されたことを検出するために圧力スイッチを用いることも知られている（例えば、特許文献１）。 Conventionally, hydraulic equipment control devices that control the supply of hydraulic oil to hydraulic equipment such as hydraulic clutches and hydraulic brakes have been widely used. It is also known to use a pressure switch to detect that hydraulic oil is filled in hydraulic equipment (for example, Patent Document 1).
　圧力スイッチは、ハウジングに収容されたスプールを備える。ハウジングは、圧力スイッチ室と、スプール孔を介して圧力スイッチ室に連なる受圧室とを有する。スプールは、スプール孔に摺動可能に挿入されるスプール本体と、圧力スイッチ室内に配置される検出ピンとを有する。 The pressure switch has a spool housed in the housing. The housing has a pressure switch chamber and a pressure receiving chamber connected to the pressure switch chamber via a spool hole. The spool includes a spool body that is slidably inserted into the spool hole, and a detection pin disposed in the pressure switch chamber.
特開２００１－３４３０３２号公報JP 2001-343032 A
　しかしながら、特許文献１に記載の圧力スイッチでは、受圧室に作動油が充填された際にスプール孔を通って圧力スイッチ室にリークする作動油が検出ピンに付着するおそれがある。作動油が検出ピンに付着すると、検出ピンが腐食してしまうという問題や、検出ピンに接触する出力ピンとの間に生じるアーク放電によって分解された作動油が接点に付着して導通不良が発生するという問題が生じる。 However, in the pressure switch described in Patent Document 1, when the pressure receiving chamber is filled with the hydraulic oil, there is a possibility that the hydraulic oil leaking to the pressure switch chamber through the spool hole adheres to the detection pin. If the hydraulic oil adheres to the detection pin, the detection pin may corrode, or the hydraulic oil decomposed by arc discharge generated between the output pin and the output pin may adhere to the contact point, resulting in poor conduction. The problem arises.
　本発明は、上述の問題に鑑みてなされたものであり、作動油の検出ピンへの付着を抑制可能な圧力スイッチ及びそれを備える油圧機器制御装置の提供を目的とする。 The present invention has been made in view of the above-described problems, and an object thereof is to provide a pressure switch capable of suppressing the adhesion of hydraulic oil to a detection pin and a hydraulic device control device including the pressure switch.
　第１の態様に係る圧力スイッチは、ハウジングと、スプールとを備える。ハウジングは、圧力スイッチ室と、第１スプール孔を介して圧力スイッチ室に連なり流体を排出可能なドレン室と、第２スプール孔を介してドレン室に連なり流体を充填可能な受圧室とを有する。スプールは、第１スプール孔と第２スプール孔に摺動可能に挿入されるスプール本体と、スプール本体に取り付けられ、圧力スイッチ室内に配置される検出ピンとを有する。 The pressure switch according to the first aspect includes a housing and a spool. The housing includes a pressure switch chamber, a drain chamber connected to the pressure switch chamber via the first spool hole and capable of discharging the fluid, and a pressure receiving chamber connected to the drain chamber via the second spool hole and filled with the fluid. . The spool includes a spool body that is slidably inserted into the first spool hole and the second spool hole, and a detection pin that is attached to the spool body and disposed in the pressure switch chamber.
　第１の態様に係る圧力スイッチによれば、圧力スイッチ室と受圧室の間にドレン室が設けられているため、第２スプール孔を通って受圧室からドレン室に作動油がリークしたとしても、ドレン室にリークした作動油が圧力スイッチ室にリークすることを回避できる。これによって、圧力スイッチ室に配置された検出ピンへの作動油の付着が抑制されるため、検出ピンの腐食や導通不良を抑えることができる。 According to the pressure switch according to the first aspect, since the drain chamber is provided between the pressure switch chamber and the pressure receiving chamber, even if hydraulic oil leaks from the pressure receiving chamber to the drain chamber through the second spool hole. The hydraulic oil leaking into the drain chamber can be prevented from leaking into the pressure switch chamber. As a result, the adhesion of the hydraulic oil to the detection pin arranged in the pressure switch chamber is suppressed, so that corrosion and poor conduction of the detection pin can be suppressed.
　第２の態様に係る圧力スイッチは、第１の態様に係り、第１スプール孔は、ドレン室に形成される第１開口を有し、スプール本体は、受圧室に流体が充填された場合に第１開口の外縁を覆う第１フランジ部を有する。 The pressure switch according to the second aspect relates to the first aspect, wherein the first spool hole has a first opening formed in the drain chamber, and the spool main body is configured when the pressure receiving chamber is filled with fluid. It has the 1st flange part which covers the outer edge of the 1st opening.
　第２の態様に係る圧力スイッチによれば、第１スプール孔が第１フランジ部によって塞がれるため、ドレン室にリークした作動油が圧力スイッチ室にリークすることをより抑制できる。 According to the pressure switch according to the second aspect, since the first spool hole is blocked by the first flange portion, it is possible to further suppress the hydraulic oil leaking to the drain chamber from leaking to the pressure switch chamber.
　第３の態様に係る圧力スイッチは、第１又は第２の態様に係り、第１スプール孔は、圧力スイッチ室に形成される第２開口を有し、スプール本体は、受圧室に流体が充填されていない場合に第２開口の外縁を覆う第２フランジ部を有する。 A pressure switch according to a third aspect relates to the first or second aspect, wherein the first spool hole has a second opening formed in the pressure switch chamber, and the spool body fills the pressure receiving chamber with fluid. If not, a second flange portion is provided to cover the outer edge of the second opening.
　第３の態様に係る圧力スイッチによれば、第１スプール孔が第２フランジ部によって塞がれるため、ドレン室にリークした作動油が圧力スイッチ室にリークすることをより抑制できる。 According to the pressure switch according to the third aspect, since the first spool hole is blocked by the second flange portion, it is possible to further suppress the hydraulic oil leaking to the drain chamber from leaking to the pressure switch chamber.
　第４の態様に係る圧力スイッチは、第３の態様に係り、第１スプール孔は、第１孔部と、第１孔部の圧力スイッチ室側に連なり、第１孔部よりも大径の第２孔部とを有する。スプール本体は、受圧室に流体が充填されていない場合に第２孔部に挿入されるシール部を有する。 A pressure switch according to a fourth aspect relates to the third aspect, wherein the first spool hole is continuous with the first hole and the pressure switch chamber side of the first hole, and has a larger diameter than the first hole. A second hole. The spool body has a seal portion that is inserted into the second hole when the pressure receiving chamber is not filled with fluid.
　第４の態様に係る圧力スイッチによれば、第１スプール孔がシール部によって塞がれるため、ドレン室にリークした作動油が圧力スイッチ室にリークすることをより抑制できる。 According to the pressure switch according to the fourth aspect, since the first spool hole is blocked by the seal portion, it is possible to further suppress the hydraulic oil leaking to the drain chamber from leaking to the pressure switch chamber.
　第５の態様に係る圧力スイッチは、第２の態様に係り、第２スプール孔は、ドレン室に形成される第３開口を有し、第１フランジ部は、受圧室に流体が充填されていない場合に第３開口の外縁を覆う。 A pressure switch according to a fifth aspect relates to the second aspect, wherein the second spool hole has a third opening formed in the drain chamber, and the first flange portion has the pressure receiving chamber filled with fluid. If not, cover the outer edge of the third opening.
　第５の態様に係る圧力スイッチによれば、第２スプール孔が第１フランジ部によって塞がれるため、受圧室に流体が充填されるまでの間に受圧室からドレン室に作動油がリークすることを抑制できる。 According to the pressure switch according to the fifth aspect, since the second spool hole is closed by the first flange portion, the hydraulic oil leaks from the pressure receiving chamber to the drain chamber until the pressure receiving chamber is filled with fluid. This can be suppressed.
　第６の態様に係る圧力スイッチは、第２の態様に係り、ハウジングは、第１スプール孔と圧力スイッチ室とを含む取り付け部と、受圧室と第２スプール孔とを含むハウジング本体とを有する。取り付け部は、ハウジング本体に取り付けられる。 A pressure switch according to a sixth aspect relates to the second aspect, and the housing has a mounting portion including a first spool hole and a pressure switch chamber, and a housing body including a pressure receiving chamber and a second spool hole. . The attachment portion is attached to the housing body.
　第６の態様に係る圧力スイッチによれば、スプール本体に第１フランジ部が設けられている場合であっても、スムーズにスプールとハウジングを組み付けることができる。 According to the pressure switch according to the sixth aspect, the spool and the housing can be assembled smoothly even when the spool body is provided with the first flange portion.
　第７の態様に係る圧力スイッチは、第６の態様に係り、スプール本体は、第１スプール孔に摺動可能に挿入される第１スプール部と、第２スプール孔に摺動可能に挿入される第２スプール部とを有する。第１フランジ部は、第２スプール部に設けられる。 A pressure switch according to a seventh aspect relates to the sixth aspect, wherein the spool body is slidably inserted into the first spool hole and the second spool hole. And a second spool portion. The first flange portion is provided on the second spool portion.
　第７の態様に係る圧力スイッチによれば、第２スプール部→取り付け部→第１スプール部→第３スプール部の順にハウジング本体に組み付けることができるため組み付け作業をスムーズにできる。 According to the pressure switch according to the seventh aspect, since it can be assembled to the housing body in the order of the second spool part → the attachment part → the first spool part → the third spool part, the assembling work can be smoothly performed.
　第８の態様に係る圧力スイッチは、第６の態様に係り、スプール本体は、第１スプール孔に摺動可能に挿入される第１スプール部と、第２スプール孔に摺動可能に挿入される第２スプール部とを有する。第１フランジ部は、第１スプール部に設けられる。 The pressure switch according to an eighth aspect relates to the sixth aspect, wherein the spool body is slidably inserted into the first spool hole and the second spool hole. And a second spool portion. The first flange portion is provided on the first spool portion.
　第８の態様に係る圧力スイッチによれば、第２スプール部→第１スプール部→取り付け部→第３スプール部の順にハウジング本体に組み付けることができるため組み付け作業をスムーズにできる。 According to the pressure switch according to the eighth aspect, since it can be assembled to the housing body in the order of the second spool part → the first spool part → the attachment part → the third spool part, the assembling work can be smoothly performed.
　第９の態様に係る圧力スイッチは、第６の態様に係り、第１スプール孔は、圧力スイッチ室に形成される第２開口を有し、スプール本体は第１スプール孔に摺動可能に挿入される第１スプール部と、第２スプール孔に摺動可能に挿入される第２スプール部と、検出ピンを支持する第３スプール部とを有する。第３スプール部は、受圧室に流体が充填されていない場合に第２開口の外縁を覆う第２フランジ部を含む。第３スプール部は、第１スプール部に取り付けられている。 A pressure switch according to a ninth aspect relates to the sixth aspect, wherein the first spool hole has a second opening formed in the pressure switch chamber, and the spool body is slidably inserted into the first spool hole. A first spool portion, a second spool portion that is slidably inserted into the second spool hole, and a third spool portion that supports the detection pin. The third spool portion includes a second flange portion that covers the outer edge of the second opening when the pressure receiving chamber is not filled with fluid. The third spool portion is attached to the first spool portion.
　第９の態様に係る圧力スイッチによれば、取り付け部の両側に第１スプール部と第３スプール部を取り付けた状態でハウジング本体に組み付けることができるため組み付け作業をよりスムーズにできる。 According to the pressure switch according to the ninth aspect, since the first spool portion and the third spool portion are attached to both sides of the attachment portion and can be assembled to the housing body, the assembling work can be performed more smoothly.
　第１０の態様に係る圧力スイッチは、第１の態様に係り、第２スプール孔は、ドレン室に形成される第３開口を有し、スプール本体は、受圧室に流体が充填されていない場合に第３開口の外縁を覆う第３フランジ部を有する。 The pressure switch according to a tenth aspect relates to the first aspect, in which the second spool hole has a third opening formed in the drain chamber, and the spool body has a pressure receiving chamber not filled with fluid. Has a third flange portion covering the outer edge of the third opening.
　第１０の態様に係る圧力スイッチによれば、第２スプール孔が第３フランジ部によって塞がれるため、受圧室に流体が充填されるまでの間に受圧室からドレン室に作動油がリークすることを抑制できる。 According to the pressure switch according to the tenth aspect, since the second spool hole is blocked by the third flange portion, the hydraulic oil leaks from the pressure receiving chamber to the drain chamber before the pressure receiving chamber is filled with fluid. This can be suppressed.
　第１１の態様に係る油圧機器制御装置は、油圧機器への作動油の供給を制御するための油圧機器制御装置であって、請求項１乃至１０のいずれかに記載の圧力スイッチを備える。 A hydraulic equipment control device according to an eleventh aspect is a hydraulic equipment control device for controlling the supply of hydraulic oil to the hydraulic equipment, and includes the pressure switch according to any one of claims 1 to 10.
　本発明によれば、作動油の検出ピンへの付着を抑制可能な圧力スイッチ及びそれを備える油圧機器制御装置を提供することができる。 According to the present invention, it is possible to provide a pressure switch capable of suppressing the adhesion of hydraulic oil to the detection pin and a hydraulic device control device including the pressure switch.
第１実施形態に係る油圧機器制御装置の構成を示す断面図Sectional drawing which shows the structure of the hydraulic equipment control apparatus which concerns on 1st Embodiment. 第１実施形態に係る油圧スイッチの構成を示す拡大断面図The expanded sectional view showing the composition of the hydraulic switch concerning a 1st embodiment. 第１実施形態に係る油圧スイッチの構成を示す拡大断面図The expanded sectional view showing the composition of the hydraulic switch concerning a 1st embodiment. 第１実施形態に係る油圧スイッチの構成を示す拡大断面図The expanded sectional view showing the composition of the hydraulic switch concerning a 1st embodiment. 第２実施形態に係る油圧スイッチの構成を示す拡大断面図The expanded sectional view which shows the structure of the hydraulic switch which concerns on 2nd Embodiment. 第２実施形態に係る油圧スイッチの構成を示す拡大断面図The expanded sectional view which shows the structure of the hydraulic switch which concerns on 2nd Embodiment. 第３実施形態に係る油圧スイッチの構成を示す拡大断面図The expanded sectional view showing the composition of the hydraulic switch concerning a 3rd embodiment
　１．第１実施形態
　（油圧機器制御装置１００の構成）
　第１実施形態に係る圧力スイッチ３０が適用された油圧機器制御装置１００の構成について説明する。油圧機器制御装置１００は、制御装置２００からの指令電流に応じて油圧機器への作動油（流体の一例）の供給を制御する。油圧機器としては、油圧式クラッチや油圧式ブレーキなどが挙げられるがこれに限られるものではない。 1. First Embodiment (Configuration of Hydraulic Equipment Control Device 100)
A configuration of the hydraulic device control apparatus 100 to which the pressure switch 30 according to the first embodiment is applied will be described. The hydraulic equipment control device 100 controls the supply of hydraulic oil (an example of fluid) to the hydraulic equipment in accordance with a command current from the control device 200. Examples of hydraulic equipment include, but are not limited to, hydraulic clutches and hydraulic brakes.
　図１は、油圧機器制御装置１００の構成を示す断面図である。図１では作動油が油圧機器に供給されていない場面が示されている。 FIG. 1 is a cross-sectional view showing the configuration of the hydraulic device control apparatus 100. FIG. 1 shows a scene where hydraulic oil is not supplied to the hydraulic equipment.
　図１に示すように、油圧機器制御装置１００は、電磁制御弁１０、圧力制御弁２０、圧力スイッチ３０及びハウジング４０を有する。以下、電磁制御弁１０、圧力制御弁２０、圧力スイッチ３０及びハウジング４０の構成について順次説明する。ただし、ハウジング４０は、圧力制御弁２０、電磁制御弁１０及び圧力スイッチ３０それぞれの一部を構成しているため、ハウジング４０の構成については、電磁制御弁１０、圧力制御弁２０及び圧力スイッチ３０の説明と合わせて説明する。 1, the hydraulic device control apparatus 100 includes an electromagnetic control valve 10, a pressure control valve 20, a pressure switch 30, and a housing 40. Hereinafter, the configurations of the electromagnetic control valve 10, the pressure control valve 20, the pressure switch 30, and the housing 40 will be sequentially described. However, since the housing 40 constitutes a part of each of the pressure control valve 20, the electromagnetic control valve 10, and the pressure switch 30, the configuration of the housing 40 is the electromagnetic control valve 10, the pressure control valve 20, and the pressure switch 30. This will be explained together with the explanation.
　（１）電磁制御弁１０
　電磁制御弁１０は、比例ソレノイド１１、連結部材１２、弁シート体１３、弁体１４、取り付け口１５、弁シート体収容室１６及びドレンポート１７を有する。取り付け口１５、弁シート体収容室１６及びドレンポート１７は、ハウジング４０の内部に形成されている。 (1) Electromagnetic control valve 10
The electromagnetic control valve 10 includes a proportional solenoid 11, a connecting member 12, a valve seat body 13, a valve body 14, an attachment port 15, a valve seat body accommodation chamber 16, and a drain port 17. The attachment port 15, the valve seat body accommodation chamber 16 and the drain port 17 are formed inside the housing 40.
　比例ソレノイド１１は、弁体１４に当接するプランジャ１１ａを有する。比例ソレノイド１１は、制御装置２００に接続される。比例ソレノイド１１は、制御装置２００からの指令電流に応じてプランジャ１１ａを進退させる。 The proportional solenoid 11 has a plunger 11 a that contacts the valve body 14. The proportional solenoid 11 is connected to the control device 200. The proportional solenoid 11 advances and retracts the plunger 11 a according to the command current from the control device 200.
　連結部材１２は、取り付け口１５に取り付けられる。連結部材１２は、比例ソレノイド１１と弁シート体１３を連結する。連結部材１２には、プランジャ１１ａが挿通されるプランジャ挿通孔１２ａが形成されている。 The connecting member 12 is attached to the attachment port 15. The connecting member 12 connects the proportional solenoid 11 and the valve seat body 13. The connecting member 12 is formed with a plunger insertion hole 12a through which the plunger 11a is inserted.
　弁シート体１３は、弁シート体収容室１６に収容される。弁シート体１３には、プランジャ挿入孔１３ａ、弁体収容室１３ｂ、パイロット凹部１３ｃ、第１ドレン流路１３ｄ及び第２ドレン流路１３ｅが形成されている。プランジャ挿入孔１３ａには、プランジャ１１ａの先端部が挿入される。弁体収容室１３ｂは、プランジャ挿入孔１３ａに連なる。弁体収容室１３ｂは、弁体１４を収容する。弁体収容室１３ｂは、弁体１４と対向する弁シート面１３Ｓを有する。弁体収容室１３ｂは、第１ドレン流路１３ｄを介してドレンポート１７に連なる。パイロット凹部１３ｃは、第２ドレン流路１３ｅを介して弁体収容室１３ｂに連なる。第２ドレン流路１３ｅは、弁体収容室１３ｂの弁シート面１３Ｓに開口する。パイロット凹部１３ｃは、後述する圧力制御弁２０のパイロット室２５に開口している。 The valve seat body 13 is accommodated in the valve seat body accommodating chamber 16. The valve seat body 13 is formed with a plunger insertion hole 13a, a valve body accommodating chamber 13b, a pilot recess 13c, a first drain channel 13d, and a second drain channel 13e. The tip of the plunger 11a is inserted into the plunger insertion hole 13a. The valve body storage chamber 13b is connected to the plunger insertion hole 13a. The valve body housing chamber 13b houses the valve body 14. The valve body storage chamber 13 b has a valve seat surface 13 </ b> S that faces the valve body 14. The valve body storage chamber 13b is connected to the drain port 17 via the first drain channel 13d. The pilot recess 13c is connected to the valve body storage chamber 13b via the second drain channel 13e. The second drain channel 13e opens to the valve seat surface 13S of the valve body storage chamber 13b. The pilot recess 13c opens to a pilot chamber 25 of the pressure control valve 20 described later.
　弁体１４は、弁シート体１３の弁体収容室１３ｂに収容される。弁体１４は、プランジャ１１ａの先端に当接しており、プランジャ１１ａの進退に応じて弁体収容室１３ｂ内を移動する。本実施形態において、弁体１４は球状に形成されているがこれに限られるものではない。 The valve element 14 is accommodated in the valve element accommodating chamber 13 b of the valve seat element 13. The valve body 14 is in contact with the tip of the plunger 11a, and moves in the valve body housing chamber 13b in accordance with the advance / retreat of the plunger 11a. In this embodiment, although the valve body 14 is formed in the spherical shape, it is not restricted to this.
　取り付け口１５は、ハウジング４０の外表面に形成される凹部である。取り付け口１５には、連結部材１２が取り付けられる。取り付け口１５は、弁シート体収容室１６に連なる。弁シート体収容室１６は、弁シート体１３を収容する。弁シート体収容室１６は、ドレンポート１７に連なる。ドレンポート１７は、作動油タンク（不図示）に連なる。 The attachment port 15 is a recess formed on the outer surface of the housing 40. The connecting member 12 is attached to the attachment port 15. The attachment port 15 continues to the valve seat body accommodation chamber 16. The valve seat body accommodation chamber 16 accommodates the valve seat body 13. The valve seat body accommodating chamber 16 is connected to the drain port 17. The drain port 17 is connected to a hydraulic oil tank (not shown).
　（２）圧力制御弁２０
　圧力制御弁２０は、スプール２１、入力室２２、バルブ室２３、ドレン室２４、パイロット室２５、入力ポート２６、出力ポート２７、ドレンポート２８及びパイロットポート２９を有する。入力室２２、バルブ室２３、ドレン室２４、パイロット室２５、入力ポート２６、出力ポート２７、ドレンポート２８及びパイロットポート２９は、ハウジング４０の内部に形成されている。 (2) Pressure control valve 20
The pressure control valve 20 includes a spool 21, an input chamber 22, a valve chamber 23, a drain chamber 24, a pilot chamber 25, an input port 26, an output port 27, a drain port 28, and a pilot port 29. The input chamber 22, the valve chamber 23, the drain chamber 24, the pilot chamber 25, the input port 26, the output port 27, the drain port 28 and the pilot port 29 are formed inside the housing 40.
　スプール２１は、電磁制御弁１０と対向する。スプール２１は、電磁制御弁１０に対して移動可能である。スプール２１は、スプール本体２１ａ、フィードバック室２１ｂ、連通路２１ｃ、バネ２１ｄ及びパイロット凹部２１ｅを有する。スプール本体２１ａは、電磁制御弁１０側から順番に形成されたパイロット室２５、ドレン室２４、バルブ室２３及び入力室２２を貫くように配置される。フィードバック室２１ｂは、連通路２１ｃを介してバルブ室２３に連なる。フィードバック室２１ｂには、バネ２１ｄが収容される。バネ２１ｄは、スプール本体２１ａを電磁制御弁１０側に付勢する。パイロット凹部２１ｅは、パイロット室２５に開口する。パイロット凹部２１ｅは、電磁制御弁１０のパイロット凹部１３ｃと対向している。 The spool 21 faces the electromagnetic control valve 10. The spool 21 is movable with respect to the electromagnetic control valve 10. The spool 21 includes a spool body 21a, a feedback chamber 21b, a communication path 21c, a spring 21d, and a pilot recess 21e. The spool body 21 a is disposed so as to penetrate the pilot chamber 25, the drain chamber 24, the valve chamber 23, and the input chamber 22 formed in order from the electromagnetic control valve 10 side. The feedback chamber 21b communicates with the valve chamber 23 via the communication path 21c. A spring 21d is accommodated in the feedback chamber 21b. The spring 21d biases the spool body 21a toward the electromagnetic control valve 10 side. The pilot recess 21 e opens into the pilot chamber 25. The pilot recess 21 e faces the pilot recess 13 c of the electromagnetic control valve 10.
　入力室２２は、入力ポート２６に連なる。入力室２２には、オイルポンプから圧送される作動油が入力ポート２６を介して供給される。スプール本体２１ａがバネ２１ｄに抗して電磁制御弁１０から離れるように移動すると、入力室２２はバルブ室２３に連なり、入力室２２からバルブ室２３に作動油が流入する。入力室２２からバルブ室２３に流入した作動油は、出力ポート２７を介して油圧機器に供給される。スプール本体２１ａがバネ２１ｄに付勢されて電磁制御弁１０側に移動すると、バルブ室２３はドレン室２４に連なり、バルブ室２３からドレン室２４に作動油が流入する。バルブ室２３からドレン室２４に流入した作動油は、ドレンポート２８を介して作動油タンクに排出される。 The input room 22 is connected to the input port 26. Hydraulic fluid pumped from the oil pump is supplied to the input chamber 22 via the input port 26. When the spool body 21a moves away from the electromagnetic control valve 10 against the spring 21d, the input chamber 22 is connected to the valve chamber 23, and hydraulic oil flows from the input chamber 22 into the valve chamber 23. The hydraulic oil that has flowed into the valve chamber 23 from the input chamber 22 is supplied to the hydraulic equipment via the output port 27. When the spool body 21 a is biased by the spring 21 d and moves toward the electromagnetic control valve 10, the valve chamber 23 is connected to the drain chamber 24, and hydraulic oil flows from the valve chamber 23 into the drain chamber 24. The hydraulic oil that has flowed into the drain chamber 24 from the valve chamber 23 is discharged to the hydraulic oil tank via the drain port 28.
　パイロット室２５は、パイロットポート２９を介して入力室２２に連なる。パイロットポート２９には、ねじ栓２９ａを介して入力室２２から作動油が流入する。パイロット室２５には、パイロットポート２９から作動油が流入する。 The pilot room 25 is connected to the input room 22 via the pilot port 29. The hydraulic oil flows into the pilot port 29 from the input chamber 22 through the screw plug 29a. Hydraulic fluid flows into the pilot chamber 25 from the pilot port 29.
　（３）圧力スイッチ３０
　圧力スイッチ３０は、スプール３１、圧力スイッチ室３２、ドレン室３３、受圧室３４及び出力部３５を有する。圧力スイッチ室３２、ドレン室３３及び受圧室３４は、ハウジング４０の内部に形成されている。 (3) Pressure switch 30
The pressure switch 30 includes a spool 31, a pressure switch chamber 32, a drain chamber 33, a pressure receiving chamber 34, and an output unit 35. The pressure switch chamber 32, the drain chamber 33, and the pressure receiving chamber 34 are formed inside the housing 40.
　スプール３１は、出力部３５と対向する。スプール３１は、出力部３５に対して移動可能である。スプール３１は、スプール本体３１ａ、検出ピン３１ｂ及びバネ３１ｃを有する。スプール本体３１ａは、出力部３５側から順番に形成された圧力スイッチ室３２、ドレン室３３及び受圧室３４を貫くように配置される。検出ピン３１ｂは、スプール本体３１ａのうち出力部３５側の端部に取り付けられる。検出ピン３１ｂは、圧力スイッチ室３２に配置される。バネ３１ｃは、スプール本体３１ａを出力部３５と反対側に付勢する。バネ３１ｃは、圧力スイッチ室３２に配置される。 The spool 31 faces the output unit 35. The spool 31 is movable with respect to the output unit 35. The spool 31 includes a spool body 31a, a detection pin 31b, and a spring 31c. The spool body 31a is disposed so as to penetrate the pressure switch chamber 32, the drain chamber 33, and the pressure receiving chamber 34 that are sequentially formed from the output portion 35 side. The detection pin 31b is attached to the end of the spool body 31a on the output unit 35 side. The detection pin 31 b is disposed in the pressure switch chamber 32. The spring 31c urges the spool body 31a to the side opposite to the output unit 35. The spring 31 c is disposed in the pressure switch chamber 32.
　圧力スイッチ室３２は、ドレン室３３を基準として出力部３５側に配置される。圧力スイッチ室３２には、検出ピン３１ｂと出力ピン３５ｃが配置される。ドレン室３３から圧力スイッチ室３２への作動油のリークが抑制されているため、圧力スイッチ室３２はドレン室３３から隔離された密閉空間である。 The pressure switch chamber 32 is arranged on the output unit 35 side with the drain chamber 33 as a reference. In the pressure switch chamber 32, a detection pin 31b and an output pin 35c are arranged. Since the hydraulic oil leakage from the drain chamber 33 to the pressure switch chamber 32 is suppressed, the pressure switch chamber 32 is a sealed space isolated from the drain chamber 33.
　ドレン室３３は、圧力スイッチ室３２と受圧室３４の間に配置される。ドレン室３３は、ドレンポート１７に連なっており作動油を排出可能である。受圧室３４に作動油が充填された場合、ドレン室３３には受圧室３４から作動油がリークしてくる。ドレン室３３にリークしてくる作動油は、ドレンポート１７を介して作動油タンクに排出される。 The drain chamber 33 is disposed between the pressure switch chamber 32 and the pressure receiving chamber 34. The drain chamber 33 is connected to the drain port 17 and can discharge hydraulic oil. When the pressure receiving chamber 34 is filled with hydraulic oil, the hydraulic oil leaks from the pressure receiving chamber 34 into the drain chamber 33. The hydraulic oil leaking into the drain chamber 33 is discharged to the hydraulic oil tank through the drain port 17.
　受圧室３４は、ドレン室３３を基準として出力部３５の反対側に配置される。受圧室３４は、出力ポート２７に連なっており作動油を充填可能である。圧力制御弁２０のバルブ室２３から出力ポート２７に流出した作動油は、油圧機器へ供給されるとともに受圧室３４に流入する。油圧機器に作動油が充填されると、受圧室３４にも作動油が充填される。受圧室３４に作動油が充填されると、その油圧によってスプール本体３１ａはバネ３１ｃに抗して出力部３５側に移動する。 The pressure receiving chamber 34 is disposed on the opposite side of the output unit 35 with respect to the drain chamber 33. The pressure receiving chamber 34 is connected to the output port 27 and can be filled with hydraulic oil. The hydraulic oil flowing out from the valve chamber 23 of the pressure control valve 20 to the output port 27 is supplied to the hydraulic device and flows into the pressure receiving chamber 34. When hydraulic equipment is filled with hydraulic oil, the pressure receiving chamber 34 is also filled with hydraulic oil. When the pressure receiving chamber 34 is filled with hydraulic oil, the hydraulic pressure moves the spool body 31a to the output portion 35 side against the spring 31c.
　出力部３５は、固定部３５ａ、支持部３５ｂ及び出力ピン３５ｃを有する。固定部３５ａは、圧力スイッチ室３２の密閉性が保たれるようにハウジング４０に密着されている。支持部３５ｂは、固定部３５ａに固定される。支持部３５ｂは、出力ピン３５ｃを支持する。出力ピン３５ｃは、圧力スイッチ室３２に露出する。出力ピン３５ｃは、スプール３１の検出ピン３１ｂと対向する。スプール本体３１ａが出力部３５側に移動した場合、出力ピン３５ｃに検出ピン３１ｂが接触する。出力ピン３５ｃは、制御装置２００と電気的に接続されている。制御装置２００は、出力ピン３５ｃに検出ピン３１ｂが接触すると、油圧機器に作動油が充填されたことを検出する。 The output unit 35 includes a fixed unit 35a, a support unit 35b, and an output pin 35c. The fixing portion 35a is in close contact with the housing 40 so that the pressure switch chamber 32 is kept airtight. The support part 35b is fixed to the fixing part 35a. The support part 35b supports the output pin 35c. The output pin 35 c is exposed to the pressure switch chamber 32. The output pin 35 c faces the detection pin 31 b of the spool 31. When the spool body 31a moves to the output unit 35 side, the detection pin 31b contacts the output pin 35c. The output pin 35c is electrically connected to the control device 200. When the detection pin 31b comes into contact with the output pin 35c, the control device 200 detects that the hydraulic equipment is filled with hydraulic oil.
　（４）油圧機器制御装置１００の動作
　・制御装置２００から指令電流が出力されていない場合
　制御装置２００から比例ソレノイド１１に指令電流が出力されていない場合、図１に示すように、プランジャ１１ａは内部、すなわち圧力制御弁２０とは反対側に引き込まれて、弁体１４は弁シート面１３Ｓから離れる。そのため、圧力制御弁２０の入力ポート２６、入力室２２及びパイロットポート２９を通ってパイロット室２５に流入した作動油は、電磁制御弁１０のパイロット凹部１３ｃ、第２ドレン流路１３ｅ、第１ドレン流路１３ｄ及び弁シート体収容室１６を通ってドレンポート１７に流出する。 (4) Operation of hydraulic equipment control device 100 When command current is not output from control device 200 When command current is not output from control device 200 to proportional solenoid 11, as shown in FIG. The valve body 14 is pulled into the inside, that is, the side opposite to the pressure control valve 20, and the valve body 14 leaves the valve seat surface 13S. Therefore, the hydraulic fluid that has flowed into the pilot chamber 25 through the input port 26, the input chamber 22, and the pilot port 29 of the pressure control valve 20 flows into the pilot recess 13 c, the second drain flow path 13 e, and the first drain It flows out to the drain port 17 through the flow path 13 d and the valve seat body accommodating chamber 16.
　この場合、パイロット室２５にはパイロット圧が発生せず、スプール本体２１ａはバネ２１ｄに付勢されて電磁制御弁１０側に押されているため、入力室２２とバルブ室２３が遮断されるとともにバルブ室２３とドレン室２４が連なる。これにより、油圧機器に充填されていた作動油は、バルブ室２３とドレン室２４を介して出力ポート２７からドレンポート２８に排出される。 In this case, no pilot pressure is generated in the pilot chamber 25, and the spool body 21a is biased by the spring 21d and pushed toward the electromagnetic control valve 10, so that the input chamber 22 and the valve chamber 23 are shut off. The valve chamber 23 and the drain chamber 24 are connected. As a result, the hydraulic oil charged in the hydraulic equipment is discharged from the output port 27 to the drain port 28 via the valve chamber 23 and the drain chamber 24.
　・制御装置２００から指令電流が出力された場合
　制御装置２００から比例ソレノイド１１に指令電流が出力された場合、プランジャ１１ａは圧力制御弁２０側に引き出されて、弁体１４は弁シート面１３Ｓに接触する。これにより、圧力制御弁２０の入力ポート２６、入力室２２及びパイロットポート２９を通ってパイロット室２５に流入した作動油はドレンポート１７側に流出できなくなる。 When a command current is output from the control device 200 When a command current is output from the control device 200 to the proportional solenoid 11, the plunger 11a is pulled out to the pressure control valve 20 side, and the valve element 14 is moved to the valve seat surface 13S. Contact. As a result, the hydraulic oil that has flowed into the pilot chamber 25 through the input port 26, the input chamber 22, and the pilot port 29 of the pressure control valve 20 cannot flow out to the drain port 17 side.
　この場合、パイロット室２５にパイロット圧が発生し、スプール本体２１ａはバネ２１ｄに抗して電磁制御弁１０から離れる向きに移動するため、入力室２２とバルブ室２３が連なるとともにバルブ室２３とドレン室２４が遮断される。これにより、油圧ポンプから圧送された作動油が入力室２２、バルブ室２３を介して出力ポート２７に流入する。 In this case, pilot pressure is generated in the pilot chamber 25, and the spool body 21a moves away from the electromagnetic control valve 10 against the spring 21d. Therefore, the input chamber 22 and the valve chamber 23 are connected, and the valve chamber 23 and the drain are connected. Chamber 24 is shut off. As a result, the hydraulic oil pumped from the hydraulic pump flows into the output port 27 via the input chamber 22 and the valve chamber 23.
　その後、油圧機器に作動油が充填されると圧力スイッチ３０の受圧室３４にも作動油が充填されて、スプール３１のスプール本体３１ａがバネ３１ｃに抗して出力部３５側に移動する。スプール３１の検出ピン３１ｂが出力部３５の出力ピン３５ｃに接触すると、制御装置２００は油圧機器に作動油が充填されたことを検出する。 Thereafter, when the hydraulic equipment is filled with hydraulic oil, the pressure receiving chamber 34 of the pressure switch 30 is also filled with hydraulic oil, and the spool body 31a of the spool 31 moves toward the output portion 35 against the spring 31c. When the detection pin 31b of the spool 31 contacts the output pin 35c of the output unit 35, the control device 200 detects that hydraulic oil has been filled in the hydraulic equipment.
　（圧力スイッチ３０の構成）
　次に、第１実施形態に係る圧力スイッチ３０の構成について説明する。上述の通り、圧力スイッチ３０は、スプール３１、出力部３５及びハウジング４０によって構成される。以下においては、スプール本体３１ａとハウジング４０の詳細な構成について主に説明する。 (Configuration of pressure switch 30)
Next, the configuration of the pressure switch 30 according to the first embodiment will be described. As described above, the pressure switch 30 includes the spool 31, the output unit 35, and the housing 40. In the following, the detailed configuration of the spool body 31a and the housing 40 will be mainly described.
　図２乃至図４は、油圧スイッチ３０の構成を示す拡大断面図である。図２では作動油が油圧機器に充填されていない場面が示され、図３では作動油が油圧機器に充填された場面が示されている。図４では、スプール３１を省略した状態が示されている。 2 to 4 are enlarged cross-sectional views showing the configuration of the hydraulic switch 30. FIG. FIG. 2 shows a scene where hydraulic oil is not filled in the hydraulic equipment, and FIG. 3 shows a scene where hydraulic oil is filled in the hydraulic equipment. FIG. 4 shows a state in which the spool 31 is omitted.
　（１）ハウジング４０の詳細構成
　ハウジング４０は、取り付け部４１とハウジング本体４２によって構成される。取り付け部４１には圧力スイッチ室３２が形成され、ハウジング本体４２には受圧室３４が形成されている。取り付け部４１とハウジング本体４２の間にはドレン室３３が形成される。圧力スイッチ室３２、ドレン室３３及び受圧室３４の構成は上述の通りである。 (1) Detailed Configuration of Housing 40 The housing 40 includes an attachment portion 41 and a housing body 42. A pressure switch chamber 32 is formed in the attachment portion 41, and a pressure receiving chamber 34 is formed in the housing body 42. A drain chamber 33 is formed between the attachment portion 41 and the housing body 42. The configurations of the pressure switch chamber 32, the drain chamber 33, and the pressure receiving chamber 34 are as described above.
　取り付け部４１は、ドレン室３３と圧力スイッチ室３２に連なる第１スプール孔４１ａを有する。ハウジング本体４２は、受圧室３４とドレン室３３に連なる第２スプール孔４２ａを有する。 The mounting portion 41 has a first spool hole 41 a that is continuous with the drain chamber 33 and the pressure switch chamber 32. The housing main body 42 has a second spool hole 42 a continuous with the pressure receiving chamber 34 and the drain chamber 33.
　第１スプール孔４１ａは、図４に示すように、ドレン室３３に形成される第１開口Ｔ１と、圧力スイッチ室３２に形成される第２開口Ｔ２を有する。第１開口Ｔ１は、ドレン室３３のうち圧力スイッチ室３２側の第１内面Ｓ１に形成される。第２開口Ｔ２は、圧力スイッチ室３２のうちドレン室３３側の第２内面Ｓ２に形成される。本実施形態において、第１スプール孔４１ａは、第１孔部Ｒ１と第２孔部Ｒ２を含む。第１孔部Ｒ１は、第１開口Ｔ１から圧力スイッチ室３２に向かって延びる。第１孔部Ｒ１は、第２孔部Ｒ２に連なる。第２孔部Ｒ２は、第１孔部Ｒ１から第２開口Ｔ２まで延びる。第２孔部Ｒ２は、第１孔部Ｒ１よりも大径である。すなわち、第１スプール孔４１ａは圧力スイッチ室３２側において拡径されている。 The first spool hole 41a has a first opening T1 formed in the drain chamber 33 and a second opening T2 formed in the pressure switch chamber 32, as shown in FIG. The first opening T1 is formed in the first inner surface S1 of the drain chamber 33 on the pressure switch chamber 32 side. The second opening T2 is formed in the second inner surface S2 of the pressure switch chamber 32 on the drain chamber 33 side. In the present embodiment, the first spool hole 41a includes a first hole R1 and a second hole R2. The first hole R1 extends from the first opening T1 toward the pressure switch chamber 32. The first hole R1 is continuous with the second hole R2. The second hole R2 extends from the first hole R1 to the second opening T2. The second hole R2 has a larger diameter than the first hole R1. That is, the diameter of the first spool hole 41a is enlarged on the pressure switch chamber 32 side.
　第２スプール孔４２ａは、図４に示すように、ドレン室３３に形成される第３開口Ｔ３と、受圧室３４に形成される第４開口Ｔ４とを有する。第３開口Ｔ３は、ドレン室３３のうち受圧室３４側の第３内面Ｓ３に形成される。第４開口Ｔ４は、受圧室３４のうちドレン室３３側の第４内面Ｓ４に形成される。本実施形態において、第２スプール孔４２ａは一様な内径を有している。 The second spool hole 42a has a third opening T3 formed in the drain chamber 33 and a fourth opening T4 formed in the pressure receiving chamber 34, as shown in FIG. The third opening T3 is formed in the third inner surface S3 of the drain chamber 33 on the pressure receiving chamber 34 side. The fourth opening T4 is formed in the fourth inner surface S4 of the pressure receiving chamber 34 on the drain chamber 33 side. In the present embodiment, the second spool hole 42a has a uniform inner diameter.
　（２）スプール本体３１ａの詳細構成
　スプール本体３１ａは、第１スプール孔４１ａと第２スプール孔４２ａに摺動可能に挿入されている。スプール本体３１ａは、第１スプール部５１、第２スプール部５２及び第３スプール部５３を含む。 (2) Detailed Configuration of Spool Body 31a The spool body 31a is slidably inserted into the first spool hole 41a and the second spool hole 42a. The spool body 31 a includes a first spool part 51, a second spool part 52, and a third spool part 53.
　第１スプール部５１は、第１スプール孔４１ａに摺動可能に挿入される。第１スプール部５１は、第１本体部５１ａとシール部５１ｂを有する。第１本体部５１ａは、カップ状に形成される。第１本体部５１ａは、第３スプール部５３側（すなわち、圧力スイッチ室３２側）に開口するバネ室５１ｃを有する。バネ室５１ｃには、検出ピン３１ｂを第３スプール部５３に押しつけるバネ５１ｄが収容されている。第１本体部５１ａは、作動油のリークが抑えられる程度に第１孔部Ｒ１の内周面に密着している。シール部５１ｂは、第１本体部５１ａのうち第３スプール部５３側の端部に設けられる。シール部５１ｂは、環状（すなわち、フランジ状）に形成される。 The first spool portion 51 is slidably inserted into the first spool hole 41a. The first spool portion 51 includes a first main body portion 51a and a seal portion 51b. The first main body 51a is formed in a cup shape. The first main body 51a has a spring chamber 51c that opens to the third spool portion 53 side (that is, the pressure switch chamber 32 side). A spring 51d that presses the detection pin 31b against the third spool portion 53 is accommodated in the spring chamber 51c. The first main body 51a is in close contact with the inner peripheral surface of the first hole R1 to such an extent that leakage of hydraulic oil is suppressed. The seal portion 51b is provided at an end portion on the third spool portion 53 side of the first main body portion 51a. The seal portion 51b is formed in an annular shape (that is, a flange shape).
　図２及び図４に示すように、シール部５１ｂは、受圧室３４に作動油が充填されていない場合に第１スプール孔４１ａの第２孔部Ｒ２に挿入され、第１スプール孔４１ａの第１孔部Ｒ１を塞ぐ。シール部５１ｂは第１孔部Ｒ１を塞いでいればよく、その形状やサイズは特に限定されない。そのため、シール部５１ｂは、第２孔部Ｒ２の内周面に密着していなくてもよい。 As shown in FIGS. 2 and 4, the seal portion 51b is inserted into the second hole portion R2 of the first spool hole 41a when the pressure receiving chamber 34 is not filled with hydraulic oil, and the first spool hole 41a One hole R1 is closed. The seal 51b only needs to block the first hole R1, and the shape and size thereof are not particularly limited. Therefore, the seal portion 51b may not be in close contact with the inner peripheral surface of the second hole portion R2.
　第２スプール部５２は、第２スプール孔４２ａに摺動可能に挿入される。第２スプール部５２は、第２本体部５２ａと第１フランジ部５２ｂを有する。第２本体部５２ａは、円柱状に形成される。第２本体部５２ａは、作動油のリークが抑えられる程度に第２スプール孔４２ａの内周面に密着している。ただし、受圧室３４に作動油が充填された場合には受圧室３４からドレン室３３に作動油がリークする場合がある。第１フランジ部５２ｂは、ドレン室３３に配置される。第１フランジ部５２ｂは、第２本体部５２ａのうちドレン室３３側の端部に設けられる。第１フランジ部５２ｂは、環状（すなわち、フランジ状）に形成される。 The second spool portion 52 is slidably inserted into the second spool hole 42a. The second spool portion 52 has a second main body portion 52a and a first flange portion 52b. The 2nd main-body part 52a is formed in a column shape. The second main body 52a is in close contact with the inner peripheral surface of the second spool hole 42a to such an extent that leakage of hydraulic oil is suppressed. However, when the pressure receiving chamber 34 is filled with hydraulic oil, the hydraulic oil may leak from the pressure receiving chamber 34 to the drain chamber 33. The first flange portion 52 b is disposed in the drain chamber 33. The 1st flange part 52b is provided in the edge part by the side of the drain chamber 33 among the 2nd main-body parts 52a. The first flange portion 52b is formed in an annular shape (that is, a flange shape).
　図３及び図４に示すように、第１フランジ部５２ｂは、受圧室３４に作動油が充填された場合にドレン室３３の第１内面Ｓ１に当接して第１開口Ｔ１の外縁を覆う。これによって、第１スプール孔４１ａは第１フランジ部５２ｂによって塞がれる。また、本実施形態において、第１フランジ部５２ｂは、図２及び図４に示すように、受圧室３４に作動油が充填されていない場合にはドレン室３３の第３内面Ｓ３に当接して第３開口Ｔ３の外縁を覆う。これによって、第２スプール孔４２ａは第１フランジ部５２ｂによって塞がれる。 3 and 4, the first flange portion 52b contacts the first inner surface S1 of the drain chamber 33 and covers the outer edge of the first opening T1 when the pressure receiving chamber 34 is filled with hydraulic oil. As a result, the first spool hole 41a is closed by the first flange portion 52b. In the present embodiment, as shown in FIGS. 2 and 4, the first flange portion 52 b contacts the third inner surface S <b> 3 of the drain chamber 33 when the pressure receiving chamber 34 is not filled with hydraulic oil. The outer edge of the third opening T3 is covered. As a result, the second spool hole 42a is closed by the first flange portion 52b.
　第３スプール部５３は、圧力スイッチ室３２に配置される。第３スプール部５３は、第１スプール部５１に取り付けられている。第３スプール部５３は、第３本体部５３ａと第２フランジ部５３ｂを有する。第３本体部５３ａは、円筒状に形成される。第３本体部５３ａには、検出ピン３１ｂが挿通されている。第２フランジ部５３ｂは、圧力スイッチ室３４に配置される。第２フランジ部５３ｂは、第３本体部５３ａのうちドレン室３３側の端部に設けられる。第２フランジ部５３ｂは、環状（すなわち、フランジ状）に形成される。第２フランジ部５３ｂは、バネ３１ｃによって出力部３５の反対側に付勢されている。第２フランジ部５３ｂは、受圧室３４に作動油が充填されていない場合に圧力スイッチ室３２の第２内面Ｓ２に当接して第２開口Ｔ２の外縁を覆う。これによって、第１スプール孔４１ａは第２フランジ部５３ｂによって塞がれる。 The third spool portion 53 is disposed in the pressure switch chamber 32. The third spool portion 53 is attached to the first spool portion 51. The third spool portion 53 has a third main body portion 53a and a second flange portion 53b. The third main body 53a is formed in a cylindrical shape. The detection pin 31b is inserted through the third main body 53a. The second flange portion 53 b is disposed in the pressure switch chamber 34. The second flange portion 53b is provided at the end of the third main body portion 53a on the drain chamber 33 side. The second flange portion 53b is formed in an annular shape (that is, a flange shape). The second flange portion 53b is biased to the opposite side of the output portion 35 by the spring 31c. The second flange portion 53b contacts the second inner surface S2 of the pressure switch chamber 32 and covers the outer edge of the second opening T2 when the pressure receiving chamber 34 is not filled with hydraulic fluid. As a result, the first spool hole 41a is closed by the second flange portion 53b.
　（特徴）
　（１）第１実施形態に係る圧力スイッチ３０は、ハウジング４０とスプール３１を備える。ハウジング４０は、圧力スイッチ室３２と、第１スプール孔４１ａを介して圧力スイッチ室３２に連なるドレン室３３と、第２スプール孔４２ａを介してドレン室３３に連なる受圧室３４とを有する。スプール３１は、第１スプール孔４１ａと第２スプール孔４２ａに摺動可能に挿入されるスプール本体３１ａと、圧力スイッチ室３２内に配置される検出ピン３１ｂとを有する。 (Characteristic)
(1) The pressure switch 30 according to the first embodiment includes a housing 40 and a spool 31. The housing 40 includes a pressure switch chamber 32, a drain chamber 33 connected to the pressure switch chamber 32 via the first spool hole 41a, and a pressure receiving chamber 34 connected to the drain chamber 33 via the second spool hole 42a. The spool 31 includes a spool body 31a that is slidably inserted into the first spool hole 41a and the second spool hole 42a, and a detection pin 31b that is disposed in the pressure switch chamber 32.
　このように、圧力スイッチ室３２と受圧室３２の間にドレン室３３が設けられているため、第２スプール孔４２ａを通って受圧室３４からドレン室３３に作動油がリークしたとしても、ドレン室３３にリークした作動油が圧力スイッチ室３２にリークすることを回避できる。これによって、圧力スイッチ室３４に配置された検出ピン３１ｂへの作動油の付着が抑制されるため、検出ピン３１ｂの腐食や検出ピン３１ｂと出力ピン３５ｃ間の導通不良を抑えることができる。 As described above, since the drain chamber 33 is provided between the pressure switch chamber 32 and the pressure receiving chamber 32, even if the hydraulic oil leaks from the pressure receiving chamber 34 to the drain chamber 33 through the second spool hole 42a, It is possible to avoid the hydraulic oil leaking to the chamber 33 from leaking to the pressure switch chamber 32. As a result, the adhesion of hydraulic oil to the detection pin 31b disposed in the pressure switch chamber 34 is suppressed, so that corrosion of the detection pin 31b and poor conduction between the detection pin 31b and the output pin 35c can be suppressed.
　（２）スプール本体３１ａは、受圧室３４に流体が充填された場合に第１スプール孔４１ａの第１開口Ｔ１の外縁を覆う第１フランジ部５２ｂを有する。 (2) The spool body 31a has a first flange portion 52b that covers the outer edge of the first opening T1 of the first spool hole 41a when the pressure receiving chamber 34 is filled with fluid.
　このように、第１スプール孔４１ａが第１フランジ部５２ｂによって塞がれるため、ドレン室３３にリークした作動油が圧力スイッチ室３２にリークすることをより抑制できる。 Thus, since the first spool hole 41a is closed by the first flange portion 52b, it is possible to further suppress the hydraulic oil leaking to the drain chamber 33 from leaking to the pressure switch chamber 32.
　（３）スプール本体３１ａは、受圧室３４に流体が充填されていない場合に第１スプール孔４１ａの第２開口Ｔ２の外縁を覆う第２フランジ部５３ｂを有する。 (3) The spool body 31a has a second flange portion 53b that covers the outer edge of the second opening T2 of the first spool hole 41a when the pressure receiving chamber 34 is not filled with fluid.
　このように、第１スプール孔４１ａが第２フランジ部５３ｂによって塞がれるため、ドレン室３３にリークした作動油が圧力スイッチ室３２にリークすることをより抑制できる。 Thus, since the first spool hole 41a is blocked by the second flange portion 53b, it is possible to further suppress the hydraulic oil leaking to the drain chamber 33 from leaking to the pressure switch chamber 32.
　（４）スプール本体３１ａは、受圧室３４に流体が充填されていない場合に第１スプール孔４１ａの第２孔部Ｒ２に挿入されるシール部５１ｂを有する。 (4) The spool body 31a includes a seal portion 51b that is inserted into the second hole portion R2 of the first spool hole 41a when the pressure receiving chamber 34 is not filled with fluid.
　このように、第１スプール孔４１ａがシール部５１ｂによって塞がれるため、ドレン室３３にリークした作動油が圧力スイッチ室３２にリークすることをより抑制できる。 Thus, since the first spool hole 41a is blocked by the seal portion 51b, it is possible to further suppress the hydraulic oil leaking to the drain chamber 33 from leaking to the pressure switch chamber 32.
　（５）第１フランジ部５２ｂは、受圧室３４に流体が充填されていない場合に第２スプール孔４２ａの第３開口Ｔ３の外縁を覆う。 (5) The first flange portion 52b covers the outer edge of the third opening T3 of the second spool hole 42a when the pressure receiving chamber 34 is not filled with fluid.
　このように、第２スプール孔４２ａが第１フランジ部５２ｂによって塞がれるため、受圧室３４に流体が充填されるまでの間に受圧室３４からドレン室３３に作動油がリークすることを抑制できる。 As described above, since the second spool hole 42a is blocked by the first flange portion 52b, the hydraulic oil is prevented from leaking from the pressure receiving chamber 34 to the drain chamber 33 until the pressure receiving chamber 34 is filled with fluid. it can.
　（６）ハウジング４０は、第１スプール孔４１ａと圧力スイッチ室３２とを含む取り付け部４１と、受圧室３４と第２スプール孔４２ａとを含むハウジング本体４２とを有する。取り付け部４１は、ハウジング本体４２に取り付けられる、
　従って、スプール本体３１ａに第１フランジ部５２ｂが設けられている場合であっても、スムーズにスプール３１とハウジング４０を組み付けることができる。 (6) The housing 40 includes a mounting portion 41 including the first spool hole 41a and the pressure switch chamber 32, and a housing body 42 including the pressure receiving chamber 34 and the second spool hole 42a. The attachment portion 41 is attached to the housing main body 42.
Therefore, even if the spool body 31a is provided with the first flange portion 52b, the spool 31 and the housing 40 can be assembled smoothly.
　（７）第１フランジ部５２ｂは、第２スプール部５２に設けられている。従って、第２スプール部５２→取り付け部４１→第１スプール部５１→第３スプール部５３の順にハウジング本体４２に組み付けることができるため組み付け作業をスムーズにできる。 (7) The first flange portion 52 b is provided in the second spool portion 52. Accordingly, since the assembly can be performed in the order of the second spool portion 52 → the attachment portion 41 → the first spool portion 51 → the third spool portion 53, the assembly work can be smoothly performed.
　２．第２実施形態
　次に、第２実施形態に係る圧力スイッチ３０’の構成について説明する。図５及び図６は、油圧スイッチ３０’の構成を示す拡大断面図である。図５では作動油が油圧機器に充填されていない場面が示され、図６では作動油が油圧機器に充填された場面が示されている。 2. Second Embodiment Next, a configuration of a pressure switch 30 ′ according to a second embodiment will be described. 5 and 6 are enlarged cross-sectional views showing the configuration of the hydraulic switch 30 '. FIG. 5 shows a scene where hydraulic oil is not filled in the hydraulic equipment, and FIG. 6 shows a scene where hydraulic oil is filled in the hydraulic equipment.
　スプール本体３１ａ’は、第１スプール孔４１ａと第２スプール孔４２ａに摺動可能に挿入されている。スプール本体３１ａ’は、第１スプール部５１’、第２スプール部５２’及び第３スプール部５３’を含む。 The spool body 31a 'is slidably inserted into the first spool hole 41a and the second spool hole 42a. The spool body 31a 'includes a first spool portion 51', a second spool portion 52 ', and a third spool portion 53'.
　第１スプール部５１’は、第１実施形態に係る第１スプール部５１とは異なりシール部５１ｂを有しておらず、第１フランジ部５１ｅを有する。第１フランジ部５１ｅは、ドレン室３３に配置される。第１フランジ部５１ｅは、第１スプール部５１’のうち受圧室３４側の端部に設けられる。第１フランジ部５１ｅは、環状（すなわち、フランジ状）に形成される。第１フランジ部５１ｅは、受圧室３４に作動油が充填された場合にドレン室３３の第１内面Ｓ１に当接して第１開口Ｔ１の外縁を覆う（図４及び図６参照）。これによって、第１スプール孔４１ａは第１フランジ部５１ｅによって塞がれる。このように、第１スプール部５１’の第１フランジ部５１ｅは、第１実施形態に係る第２スプール部５２の第１フランジ部５２ｂと同じように機能する。 Unlike the first spool part 51 according to the first embodiment, the first spool part 51 'does not have the seal part 51b but has the first flange part 51e. The first flange portion 51 e is disposed in the drain chamber 33. The first flange portion 51e is provided at the end of the first spool portion 51 'on the pressure receiving chamber 34 side. The first flange portion 51e is formed in an annular shape (that is, a flange shape). The first flange portion 51e contacts the first inner surface S1 of the drain chamber 33 and covers the outer edge of the first opening T1 when the pressure receiving chamber 34 is filled with hydraulic oil (see FIGS. 4 and 6). As a result, the first spool hole 41a is closed by the first flange portion 51e. Thus, the first flange portion 51e of the first spool portion 51 'functions in the same manner as the first flange portion 52b of the second spool portion 52 according to the first embodiment.
　第２スプール部５２’は、第３フランジ部５２ｃを有する。第３フランジ部５２ｃは、受圧室３４に作動油が充填されていない場合にドレン室３３の第３内面Ｓ３に当接して第３開口Ｔ３の外縁を覆う。これによって、第２スプール孔４２ａは第３フランジ部５２ｃによって塞がれる。一方、本実施形態では第１フランジ部５１ｅが第１スプール部５１’に設けられているため、受圧室３４に作動油が充填された場合に第３フランジ部５２ｃが第１スプール孔４１ａを塞ぐ必要はない。 The second spool portion 52 'has a third flange portion 52c. The third flange portion 52c contacts the third inner surface S3 of the drain chamber 33 and covers the outer edge of the third opening T3 when the pressure receiving chamber 34 is not filled with hydraulic oil. As a result, the second spool hole 42a is closed by the third flange portion 52c. On the other hand, in the present embodiment, since the first flange portion 51e is provided in the first spool portion 51 ', the third flange portion 52c closes the first spool hole 41a when the pressure receiving chamber 34 is filled with hydraulic oil. There is no need.
　第３スプール部５３’は、第１実施形態に係る第３スプール部５３と同じ構成及び機能を有する。第３スプール部５３’は、第１スプール部５１’とは別部材である。第３スプール部５３’は、ハウジング４０の取り付け部４１を挟むように第１スプール部５１’に取り付けられている。 The third spool portion 53 'has the same configuration and function as the third spool portion 53 according to the first embodiment. The third spool portion 53 'is a separate member from the first spool portion 51'. The third spool portion 53 ′ is attached to the first spool portion 51 ′ so as to sandwich the attachment portion 41 of the housing 40.
　（特徴）
　（１）第１実施形態に係る圧力スイッチ３０’において、第１フランジ部５１ｅは第１スプール部５１’に設けられている。 (Characteristic)
(1) In the pressure switch 30 ′ according to the first embodiment, the first flange portion 51e is provided in the first spool portion 51 ′.
　従って、第２スプール部５２’→第１スプール部５１’→取り付け部４１→第３スプール部５３’の順にハウジング本体４２に組み付けることができるため組み付け作業をスムーズにできる。 Therefore, since the second spool portion 52 ', the first spool portion 51', the attachment portion 41, and the third spool portion 53 'can be assembled in this order, the assembling work can be performed smoothly.
　（２）第３スプール部５３’は、ハウジング４０の取り付け部４１を挟むように第１スプール部５１’に取り付けられている。 (2) The third spool portion 53 ′ is attached to the first spool portion 51 ′ so as to sandwich the attachment portion 41 of the housing 40.
　従って、取り付け部４１の両側に第１スプール部５１’と第３スプール部５３’を取り付けた状態でハウジング本体４２に組み付けることができるため組み付け作業をよりスムーズにできる。 Therefore, since the first spool portion 51 ′ and the third spool portion 53 ′ are attached to both sides of the attachment portion 41 and can be assembled to the housing main body 42, the assembly operation can be performed more smoothly.
　（３）第２スプール部５２’は、受圧室３４に流体が充填されていない場合に第２スプール孔４２ａの第３開口Ｔ３の外縁を覆う第３フランジ部５２ｃを有する。 (3) The second spool portion 52 'includes a third flange portion 52c that covers the outer edge of the third opening T3 of the second spool hole 42a when the pressure receiving chamber 34 is not filled with fluid.
　このように、第２スプール孔４２ａが第３フランジ部５２ｃによって塞がれるため、受圧室３４に流体が充填されるまでの間に受圧室３４からドレン室３３に作動油がリークすることを抑制できる。 In this way, since the second spool hole 42a is blocked by the third flange portion 52c, it is possible to prevent the hydraulic oil from leaking from the pressure receiving chamber 34 to the drain chamber 33 until the pressure receiving chamber 34 is filled with fluid. it can.
　３．第３実施形態
　次に、第３実施形態に係る圧力スイッチ３０”の構成について説明する。図７は、油圧スイッチ３０”の構成を示す拡大断面図である。図７では作動油が油圧機器に充填されていない場面が示されている。 3. Third Embodiment Next, the configuration of a pressure switch 30 ″ according to a third embodiment will be described. FIG. 7 is an enlarged cross-sectional view showing the configuration of the hydraulic switch 30 ″. FIG. 7 shows a scene in which hydraulic oil is not filled in the hydraulic equipment.
　スプール本体３１ａ”は、第３スプール部５３と第４スプール部５４を含む。第３スプール部５３は、第１実施形態に係る第３スプール部５３と同じ構成及び機能を有する。 The spool body 31a "includes a third spool portion 53 and a fourth spool portion 54. The third spool portion 53 has the same configuration and function as the third spool portion 53 according to the first embodiment.
　第４スプール部５４は、端面にバネ室５１ｃが形成された円柱体である。第４スプール部５４は、第１スプール孔４１ａと第２スプール孔４２ａに摺動可能に挿入されている。第４スプール部５４は、第１実施形態に係る第１スプール部５１と第２スプール部５２を合わせた構成及び機能を有する。ただし、第４スプール部５４には、第１実施形態に係る第１フランジ部５２ｂやシール部５１ｂを有していない。従って、圧力スイッチ室３２とドレン室３３は、第４スプール部５４が第１スプール孔４１ａの内周面に密着することによってのみ隔離されている。 The fourth spool portion 54 is a cylindrical body having a spring chamber 51c formed on the end face. The fourth spool portion 54 is slidably inserted into the first spool hole 41a and the second spool hole 42a. The fourth spool portion 54 has a configuration and a function in which the first spool portion 51 and the second spool portion 52 according to the first embodiment are combined. However, the fourth spool portion 54 does not have the first flange portion 52b or the seal portion 51b according to the first embodiment. Therefore, the pressure switch chamber 32 and the drain chamber 33 are isolated only when the fourth spool portion 54 comes into close contact with the inner peripheral surface of the first spool hole 41a.
　なお、第３実施形態に係るハウジング４０には、取り付け部４１が設けられていない。 Note that the housing 40 according to the third embodiment is not provided with the attachment portion 41.
　（特徴）
　（１）第３実施形態に係るスプール本体３１ａ”は、第１スプール孔４１ａと第２スプール孔４２ａに摺動可能に挿入されている。従って、第２スプール孔４２ａを通って受圧室３４からドレン室３３に作動油がリークしたとしても、ドレン室３３にリークした作動油が圧力スイッチ室３２にリークすることを回避できる。 (Characteristic)
(1) The spool main body 31a ″ according to the third embodiment is slidably inserted into the first spool hole 41a and the second spool hole 42a. Therefore, the spool body 31a ″ passes through the second spool hole 42a from the pressure receiving chamber 34. Even if the hydraulic oil leaks into the drain chamber 33, it can be avoided that the hydraulic oil leaked into the drain chamber 33 leaks into the pressure switch chamber 32.
　（２）スプール本体３１ａ”は円柱状に形成されており、第１フランジが設けられていない。従って、スプール本体３１ａ”を外部から第１スプール孔４１ａと第２スプール孔４２ａに挿入できるため、ハウジング４０に取り付け部４１を設ける必要がない。従って、圧力スイッチ３０”の全体構成を簡素にすることができる。 (2) The spool body 31a ″ is formed in a cylindrical shape and is not provided with a first flange. Therefore, the spool body 31a ″ can be inserted into the first spool hole 41a and the second spool hole 42a from the outside. There is no need to provide the mounting portion 41 in the housing 40. Accordingly, the overall configuration of the pressure switch 30 ″ can be simplified.
　４．他の実施形態
　第１実施形態において、スプール本体３１ａは、第１フランジ部５２ｂと第２フランジ部５３ｂを有することとしたが、これらの一方だけを有していてもよいし両方を有していなくてもよい。 4). Other Embodiments In the first embodiment, the spool body 31a has the first flange portion 52b and the second flange portion 53b. However, the spool body 31a may have only one or both of them. It does not have to be.
　第１実施形態において、第１フランジ部５２ｂは、第２スプール部５２に設けられることとしたが、第１スプール部５１に設けられていてもよい。同様に、第２フランジ部５３ｂは、第３スプール部５３に設けられることとしたが、第１スプール部５１に設けられていてもよい。 In the first embodiment, the first flange portion 52 b is provided in the second spool portion 52, but may be provided in the first spool portion 51. Similarly, the second flange portion 53 b is provided in the third spool portion 53, but may be provided in the first spool portion 51.
　第１実施形態において、第１スプール部５１は、シール部５１ｂを有することとしたが、これを有していなくてもよい。この場合、第１スプール孔４１ａに第２孔部Ｒ２を設ける必要はなくなる。 In the first embodiment, the first spool portion 51 has the seal portion 51b, but may not have this. In this case, it is not necessary to provide the second hole R2 in the first spool hole 41a.
　第１実施形態において、第１スプール部５１と第２スプール部５２は別部材であることとしたが、スプール本体３１ａが第１フランジ部５２ｂを有していない場合には、これらを一部材とすることができる。 In the first embodiment, the first spool portion 51 and the second spool portion 52 are separate members. However, when the spool body 31a does not have the first flange portion 52b, these are regarded as one member. can do.
　第２実施形態において、スプール本体３１ａ’は、第１フランジ部５１ｅ、第２フランジ部５３ｂ及び第３フランジ部５２ｃを有することとしたが、これらのうち１つ又は２つだけを有していてもよいし全てを有していなくてもよい。 In the second embodiment, the spool body 31a ′ has the first flange portion 51e, the second flange portion 53b, and the third flange portion 52c, but has only one or two of them. It does not have to be all.
　第２実施形態において、第１フランジ部５１ｅは、第１スプール部５１’に設けられることとしたが、第２スプール部５２’に設けられていてもよい。この際、第１フランジ部５１ｅは、第３フランジ部５２ｃと一体的に形成されてもよい。また、第２フランジ部５３ｂは、第３スプール部５３’に設けられることとしたが、第１スプール部５１’に設けられていてもよい。 In the second embodiment, the first flange portion 51e is provided in the first spool portion 51 ', but may be provided in the second spool portion 52'. At this time, the first flange portion 51e may be formed integrally with the third flange portion 52c. The second flange portion 53b is provided in the third spool portion 53 ', but may be provided in the first spool portion 51'.
　第２実施形態において、第１スプール部５１’と第２スプール部５２’は別部材であることとしたが、スプール本体３１ａ’が第１フランジ部５１ｅと第３フランジ部５２ｃを有していなければ、これらを一部材とすることができる。 In the second embodiment, the first spool portion 51 ′ and the second spool portion 52 ′ are separate members, but the spool body 31a ′ must have the first flange portion 51e and the third flange portion 52c. In this case, these can be made into one member.
　第１及び第２実施形態では触れていないが、スプール本体３１ａ，３１ａ’は、受圧室３４に流体が充填された場合に第２スプール孔４２ａの第４開口Ｔ４の外縁を覆う第４フランジ部を有していてもよい。このように、第２スプール孔４２ａが第４フランジ部によって塞がれることによって、受圧室３４に充填された作動油がドレン室３３にリークすることをより抑制できる。 Although not touched in the first and second embodiments, the spool main bodies 31a and 31a ′ have a fourth flange portion that covers the outer edge of the fourth opening T4 of the second spool hole 42a when the pressure receiving chamber 34 is filled with fluid. You may have. As described above, the second spool hole 42a is blocked by the fourth flange portion, so that the hydraulic oil filled in the pressure receiving chamber 34 can be further prevented from leaking into the drain chamber 33.
　第３実施形態では、第３スプール部５３が第２フランジ部５３ｂを有し、第４スプール部５４には一切フランジが設けられないこととしたが、第２フランジ部５３ｂか第４スプール部５４に設けられていてもよい。この場合であっても、ハウジング４０に取り付け部４１を設ける必要はない。 In the third embodiment, the third spool portion 53 has the second flange portion 53b, and no flange is provided on the fourth spool portion 54. However, the second flange portion 53b or the fourth spool portion 54 is not provided. May be provided. Even in this case, it is not necessary to provide the attachment portion 41 in the housing 40.
　なお、上記実施形態では、図１に示すように、電磁制御弁１０と圧力制御弁２０を備える油圧機器制御装置１００に圧力スイッチ３０を適用したが、電磁制御弁１０と圧力制御弁２０には周知の様々な構成を採用することができる。例えば、一般的な電磁制御弁と圧力制御弁の一例は、特開２００１－３４３０３２、特開２００９－２５０３９２、特開２０１１－１６９４３９、特開２０１１－１６５４１５に開示されている。 In the above embodiment, as shown in FIG. 1, the pressure switch 30 is applied to the hydraulic device control device 100 including the electromagnetic control valve 10 and the pressure control valve 20, but the electromagnetic control valve 10 and the pressure control valve 20 include Various known configurations can be employed. For example, examples of general electromagnetic control valves and pressure control valves are disclosed in Japanese Patent Application Laid-Open Nos. 2001-343032, 2009-250392, 2011-169439, and 2011-165415.
３０　　　圧力スイッチ
３１　　　スプール
３１ａ　　スプール本体
３１ｂ　　検出ピン
３２　　　圧力スイッチ室
３３　　　ドレン室
３４　　　受圧室
４０　　　ハウジング
４１　　　取り付け部
４１ａ　　第１スプール孔
Ｔ１　　　第１開口
Ｔ２　　　第２開口
４２　　　ハウジング本体
４２ａ　　第２スプール孔
Ｔ３　　　第３開口
Ｔ４　　　第４開口
５１　　　第１スプール部
５１ａ　　第１本体部
５１ｂ　　シール部
５１ｅ　　第１フランジ部
５２　　　第２スプール部
５２ａ　　第２本体部
５２ｂ　　第１フランジ部
５２ｃ　　第３フランジ部
５３　　　第３スプール部
５３ａ　　第３本体部
５３ｂ　　第２フランジ部 30 Pressure switch 31 Spool 31a Spool main body 31b Detection pin 32 Pressure switch chamber 33 Drain chamber 34 Pressure receiving chamber 40 Housing 41 Mounting portion 41a First spool hole T1 First opening T2 Second opening 42 Housing main body 42a Second spool hole T3 Third Opening T4 Fourth opening 51 First spool portion 51a First body portion 51b Seal portion 51e First flange portion 52 Second spool portion 52a Second body portion 52b First flange portion 52c Third flange portion 53 Third spool portion 53a First 3 body part 53b 2nd flange part

Claims (11)

  1. 　圧力スイッチ室と、第１スプール孔を介して前記圧力スイッチ室に連なり流体を排出可能なドレン室と、第２スプール孔を介して前記ドレン室に連なり流体を充填可能な受圧室とを有するハウジングと、
    　前記第１スプール孔と前記第２スプール孔に摺動可能に挿入されるスプール本体と、前記スプール本体に取り付けられ、前記圧力スイッチ室内に配置される検出ピンとを有するスプールと、
    を備える圧力スイッチ。     A housing having a pressure switch chamber, a drain chamber connected to the pressure switch chamber through a first spool hole and capable of discharging fluid, and a pressure receiving chamber connected to the drain chamber through a second spool hole and filled with fluid. When,
    A spool having a spool body slidably inserted into the first spool hole and the second spool hole, and a detection pin attached to the spool body and disposed in the pressure switch chamber;
    With pressure switch.
  2. 　前記第１スプール孔は、前記ドレン室に形成される第１開口を有し、
    　前記スプール本体は、前記受圧室に流体が充填された場合に前記第１開口の外縁を覆う第１フランジ部を有する、
    請求項１に記載の圧力スイッチ。     The first spool hole has a first opening formed in the drain chamber,
    The spool body has a first flange portion that covers an outer edge of the first opening when the pressure receiving chamber is filled with fluid.
    The pressure switch according to claim 1.
  3. 　前記第１スプール孔は、前記圧力スイッチ室に形成される第２開口を有し、
    　前記スプール本体は、前記受圧室に流体が充填されていない場合に前記第２開口の外縁を覆う第２フランジ部を有する、
    請求項１又は２に記載の圧力スイッチ。     The first spool hole has a second opening formed in the pressure switch chamber,
    The spool body has a second flange portion that covers an outer edge of the second opening when the pressure receiving chamber is not filled with fluid.
    The pressure switch according to claim 1 or 2.
  4. 　前記第１スプール孔は、第１孔部と、前記第１孔部の前記圧力スイッチ室側に連なり、前記第１孔部よりも大径の第２孔部とを有し、
    　前記スプール本体は、前記受圧室に流体が充填されていない場合に前記第２孔部に挿入されるシール部を有する、
    請求項３に記載の圧力スイッチ。     The first spool hole has a first hole and a second hole having a diameter larger than that of the first hole connected to the pressure switch chamber side of the first hole.
    The spool body has a seal portion that is inserted into the second hole when the pressure receiving chamber is not filled with fluid.
    The pressure switch according to claim 3.
  5. 　前記第２スプール孔は、前記ドレン室に形成される第３開口を有し、
    　前記第１フランジ部は、前記受圧室に流体が充填されていない場合に前記第３開口の外縁を覆う、
    請求項２に記載の圧力スイッチ。     The second spool hole has a third opening formed in the drain chamber,
    The first flange portion covers an outer edge of the third opening when the pressure receiving chamber is not filled with fluid,
    The pressure switch according to claim 2.
  6. 　前記ハウジングは、前記第１スプール孔と前記圧力スイッチ室とを含む取り付け部と、前記受圧室と前記第２スプール孔とを含むハウジング本体とを有し、
    　前記取り付け部は、前記ハウジング本体に取り付けられる、
    請求項２に記載の圧力スイッチ。     The housing includes a mounting portion including the first spool hole and the pressure switch chamber, and a housing body including the pressure receiving chamber and the second spool hole.
    The attachment portion is attached to the housing body.
    The pressure switch according to claim 2.
  7. 　前記スプール本体は、前記第１スプール孔に摺動可能に挿入される第１スプール部と、前記第２スプール孔に摺動可能に挿入される第２スプール部とを有し、
    　前記第１フランジ部は、前記第２スプール部に設けられる、
    請求項６に記載の圧力スイッチ。     The spool body has a first spool portion that is slidably inserted into the first spool hole, and a second spool portion that is slidably inserted into the second spool hole,
    The first flange portion is provided in the second spool portion.
    The pressure switch according to claim 6.
  8. 　前記スプール本体は、前記第１スプール孔に摺動可能に挿入される第１スプール部と、前記第２スプール孔に摺動可能に挿入される第２スプール部とを有し、
    　前記第１フランジ部は、前記第１スプール部に設けられる、
    請求項６に記載の圧力スイッチ。     The spool body has a first spool portion that is slidably inserted into the first spool hole, and a second spool portion that is slidably inserted into the second spool hole,
    The first flange portion is provided on the first spool portion.
    The pressure switch according to claim 6.
  9. 　前記第１スプール孔は、前記圧力スイッチ室に形成される第２開口を有し、
    　前記スプール本体は前記第１スプール孔に摺動可能に挿入される第１スプール部と、前記第２スプール孔に摺動可能に挿入される第２スプール部と、前記検出ピンを支持する第３スプール部とを有し、
    　前記第３スプール部は、前記受圧室に流体が充填されていない場合に前記第２開口の外縁を覆う第２フランジ部を含み、
    　前記第３スプール部は、前記第１スプール部に取り付けられている、
    請求項６に記載の圧力スイッチ。     The first spool hole has a second opening formed in the pressure switch chamber,
    The spool body supports a first spool portion slidably inserted into the first spool hole, a second spool portion slidably inserted into the second spool hole, and a third pin supporting the detection pin. A spool portion,
    The third spool portion includes a second flange portion that covers an outer edge of the second opening when the pressure receiving chamber is not filled with fluid,
    The third spool portion is attached to the first spool portion;
    The pressure switch according to claim 6.
  10. 　前記第２スプール孔は、前記ドレン室に形成される第３開口を有し、
    　前記スプール本体は、前記受圧室に流体が充填されていない場合に前記第３開口の外縁を覆う第３フランジ部を有する、
    請求項１に記載の圧力スイッチ。     The second spool hole has a third opening formed in the drain chamber,
    The spool body has a third flange portion that covers an outer edge of the third opening when the pressure receiving chamber is not filled with fluid.
    The pressure switch according to claim 1.
  11. 　油圧機器への作動油の供給を制御するための油圧機器制御装置であって、
    　請求項１乃至１０のいずれかに記載の圧力スイッチを備える油圧機器制御装置。     A hydraulic device control device for controlling supply of hydraulic oil to a hydraulic device,
    A hydraulic equipment control device comprising the pressure switch according to claim 1.
PCT/JP2015/052691 2015-01-30 2015-01-30 Pressure switch, and device for controlling hydraulic equipment WO2016121104A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011165415A (en) * 2010-02-08 2011-08-25 Komatsu Ltd Electric contact protection structure of hydraulic control device
JP2011169439A (en) * 2010-02-22 2011-09-01 Komatsu Ltd Pressure control valve and hydraulic control device including the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011165415A (en) * 2010-02-08 2011-08-25 Komatsu Ltd Electric contact protection structure of hydraulic control device
JP2011169439A (en) * 2010-02-22 2011-09-01 Komatsu Ltd Pressure control valve and hydraulic control device including the same

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