JP3158167B2 - Fluid pressure control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to coaxial first and second guide cylinders having a non-magnetic portion at an intermediate portion, a coil surrounding the first and second guide cylinders, and a first guide. A plunger housed in the first and second guide cylinder portions so as to be able to approach and separate from a fixed core provided on the cylinder portion side, and to apply an axial electromagnetic force according to an input electric amount to the coil to the plunger. A first and second linear solenoid;
A spool connected to and connected to the plunger is provided in a sliding hole of the valve housing coaxial with the guide cylinder so as to be able to switch between a fluid pressure device, a fluid pressure supply source, and a reservoir. And a control valve movably fitted.

[0002]

2. Description of the Related Art Conventionally, such an apparatus is disclosed in, for example,
This is known from, for example, JP-A-1369693.

[0003]

However, in the prior art described above, the housing of the linear solenoid is connected to the valve housing with the fixed core as the valve housing side, and the plunger movably penetrates the fixed core, and the control valve. And the spools are coaxially linked and connected to each other as a separate body, and the valve housing is provided with a port communicating with a fluid pressure device, a port communicating with a fluid pressure supply source, and a port communicating with a reservoir. I have. Therefore, the axial length of the fluid pressure control device must be relatively long. Moreover, the fluid pressure of the fluid pressure device acts on the spool over its entire cross-section, thereby generating a reaction force opposing the force applied to the spool from the linear solenoid. The size of the linear solenoid is unavoidable because of its large size, and hence the need to make the electromagnetic force generated by the linear solenoid relatively large, which also increases the size of the fluid pressure control device.

[0004] The present invention has been made in view of such circumstances, and has as its object to provide a fluid pressure control device capable of downsizing.

[0005]

According to the present invention, according to the present invention, the second guide tube portion is provided integrally with the valve housing with its inner surface coaxially connected to the slide hole. ,
A plunger that penetrates the second guide cylinder portion in a fluid-tight and movable manner is integrally connected to the spool, and the valve housing includes:
An input port leading to a fluid pressure source and one of an output port leading to a fluid pressure device and a release port leading to a reservoir are provided, the fixed core being provided with the other of said output port and the release port, a plunger and a spool. A first pressure receiving surface on which the fluid pressure of the output port acts toward the fixed core side, and a fluid pressure of the output port acting on the side opposite to the fixed core, and the pressure receiving pressure is higher than the first pressure receiving surface. wide and the second pressure receiving surface is provided in area, that both
Multiplied by the fluid pressure at the output port
Force acts as a reaction to the electromagnetic force of the linear solenoid
It is to be.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. A reaction force generating means 3 is connected to a brake pedal 1 via a pedal force sensor 2 for detecting a braking operation amount. In accordance with the braking operation amount detected by the treading force sensor 2, the braking fluid pressure is changed according to the fluid pressure control device 4 configured according to the present invention.
₁ to the brake device 5 as a fluid pressure device.

[0008] Fluid pressure control device 4₁Is a linear solenoid
6₁And control valve 7₁It consists of. And Lini
A solenoid 6₁Is the gap 8 as the non-magnetic part
Coaxial first and second guide cylinder portions 9 and 10
And a coil surrounding the first and second guide cylinder portions 9 and 10
11 and a fixed core 12 provided on the first guide cylinder 9 side.
Of the first and second guide cylinders 9,
10 and a plunger 13 housed in the
Plunge the electromagnetic force in the axial direction according to the amount of electricity input to
To the key 13. Control valve 7₁Is the first
And a sliding hole 14 coaxial with the second guide cylinders 9 and 10.₁To
Valve housing 15 having₁And the sliding hole 14 ₁Slidable on
Spool 16 fitted to₁And the spool 16
₁Are the brake device 5, the fluid pressure supply source 17 and the reservoir
Communication with the server 18 can be switched.

The second guide cylinder 10 is provided with a valve housing 15₁To
It is provided integrally. In addition, the second guide cylinder 1 is provided through the gap 8.
One end of the first guide cylinder portion 9 which is coaxially opposed to the
A 12 is provided integrally, and the fixed core 12
A flange portion 19 extending outward in the radial direction is integrally provided, and furthermore,
The first and second guide cylinders 9 and 1
An outer cylinder 20 coaxial with 0 is continuously provided. Thus, the outer cylinder 20
Is the valve housing 15 ₁Are integrally connected. Moreover
The first and second guide cylinder portions 9 and 10 are made of a non-magnetic material.
The connecting tube 21 is fitted to both ends of the connecting tube 21
The coil 11 surrounding the flange housing 19 and the valve housing 1
5₁Sandwiched between.

A first release chamber 22 is formed between the fixed core 12 and the plunger 13.
The release chamber 22 is provided with a release port 2 provided in the fixed core 12.
It communicates with the reservoir 18 via a 3 _1. In addition, a return spring 24 that exerts a spring force in a direction that separates the plunger 13 from the fixed core 12 is housed in the first release chamber 22.

[0011] In the control valve _71, the valve housing 15 ₁
Sliding hole 14 ₁ provided, rather than the inner surface of the second guide tube portion 10 in the linear solenoid ₆₁ is intended to be a larger diameter, one end of the slide hole 14 _1, the second guide tube portion 10
Is coaxially connected to the inner surface through a step. Thus, the sliding hole 14
_One end of the spool 16 ₁ slidably fitted to ₁
The plunger 13 supported movably in a fluid-tight manner by the second guide cylinder 10 is integrally connected, and the plunger 13 and the spool 16 ₁ are connected to each other with a step. . The other end of the slide hole 14 ₁ is closed by a plug 25 screwed into the valve housing 15 _1, a second release chamber 26 formed between the other end of the plug body 25 and the spool 16 _1, the valve communicates with the first release chamber 22 via the communication passage 27 drilled in the housing 15 _1.

[0012] connecting portion exterior surface of the spool 16 ₁ and the plunger 13, as well as between the inner surface and the slide hole 14 ₁ of the inner surface of the second guide tube portion 10, an annular output chamber 28 is formed,
The output chamber 28 is communicated to the brake device 5 via the output port 29 ₁ which is formed in the valve housing 15 _1.
Moreover, the fluid pressure in the output chamber 28, that is, the output port 29 ₁ is applied to the plunger 13 and the spool 16 ₁ by the fixed core 1.
A first pressure receiving surface 30 _first annular acting toward the 2 side, from the output chamber 28 that is, the first pressure receiving surface 30 ₁ with acting toward the opposite side of the fluid pressure in the output port 29 ₁ and the fixed core 12 ₁ and the second pressure receiving surface 31 of the wide annular of pressure receiving area also is provided opposite to each other.

The fluid pressure supply source 17 includes a pump 32 for pumping fluid pressure from the reservoir 18, an accumulator 33 connected to a discharge port of the pump 32, and a pressure switch 34 for controlling the operation of the pump 32. are those comprising, the fluid pressure supply source 17 is connected to the input port 35 ₁ provided in the valve housing 15 _1.

Slide hole 14₁Has an input port 35
₁, The communication channel 27, and the first release
Release port 23 through chamber 22₁With an annular groove 37 leading to
Are provided at intervals in the axial direction.
6₁Is provided with an annular recess 38 communicating with the output chamber 28 on the outer surface thereof.
Can be Thus, the spool 16₁Is the linear solenoid 6 ₁
Side, the annular recess 38 passes through the annular groove 36.
, Spool 16₁Is the linear solenoid 6₁Separate from
When it moves to the side where
The phase of the annular grooves 36 and 37 and the annular recess 38
The pair position is set.

Further, the detection signal of the treading force sensor 2 is inputted to a control means 39, and the control means 39 urges the coil 11 with an electric quantity corresponding to the braking operation amount detected by the treading force sensor 2. .

Next, the operation of the first embodiment will be described. When the coil 11 is excited, the plunger 1
3 That spool 16 ₁ is attracted to the fixed core 12 side, the annular groove 36 by communicating with the annular recess 38, will act on the brake device 5 fluid pressure from the output port 29 ₁ from the fluid pressure supply source 17 . At this time, the linear solenoid ₆₁ is intended to provide an axial electromagnetic force according to the input electrical quantity to the plunger 13 i.e. the spool 16 _1, the spool 16 _1, the first pressure receiving surface 30 ₁ and the second
The reaction force due to the fluid pressure of the output chamber 28, that is, the output port 29 ₁ according to the pressure receiving area difference of the pressure receiving surface 31 ₁ and the return spring 2
4 of the spring force acts against the electromagnetic force of the linear solenoid _61. Therefore the fluid pressure in the output chamber 28 that is, the output port 29 ₁ is such as to correspond to the input electrical quantity to the coil 11.

[0017] In such a fluid pressure control apparatus 4 _1,
The second guide tube portion 10 of the linear solenoid _61, the control valve 7
_The plunger 1 is provided integrally with the _first valve housing 151 and penetrates the second guide cylinder 10 movably and fluid-tightly.
Since 3 is integrally coupled to the spool 16 _1, it is possible to configure together a linear solenoid ₆₁ and the control valve ₇₁ to compact.

[0018] The valve housing 15 _1, the input port 35 ₁ and output port 29 ₁ is provided, fixed core 1
Since the 2 was set to release port 23 ₁ is provided,
When three ports compared to the prior art which is provided in the valve housing, it is possible to shorten the axial length of the valve housing 15 _1.

Further, the plunger 13 and the spool 1
6 ₁ has a first pressure receiving surface 301 on which the fluid pressure of the output port 29 ₁ acts toward the fixed core 12 side, and an output port 29 ₁
Since _first fluid pressure and _a second pressure receiving surface 31 wide pressure receiving area than the first pressure receiving surface 30 ₁ with acting toward the opposite side is provided with the stationary core 12, electromagnetic force of the linear solenoid ₆₁ reaction force, can be relatively small is obtained by multiplying the fluid pressure in the output port 29 ₁ to the first pressure receiving area difference of the pressure receiving surface 30 ₁ and the second pressure receiving surface 31 _1, thus the linear solenoid against since 6 ₁ can be kept relatively small spring force of the electromagnetic force and the return spring 24 to be generated at, it is possible to reduce the size of the linear solenoid _61.

[0020] In this way, the linear solenoid ₆₁ and the control valve ₇₁ constitute together compactly, and to reduce the axial length of the valve housing 15 _1, further downsizing of the linear solenoid ₆₁ makes it possible to reduce the size of the fluid pressure control apparatus 4 _1.

FIG. 2 shows a second embodiment of the present invention, in which parts corresponding to those of the first embodiment are denoted by the same reference numerals.

The fluid pressure control apparatus 4 ₂ is made of a linear solenoid 6 ₂ and the control valve 7 _2. The second guide tube portion of the linear solenoid 6 ₂ Thus 10 is provided integrally with the valve housing 15 ₂ of the control valve 7 _2. Also the first
An output chamber 40 is formed between the fixed core 12 and the plunger 13 provided at one end of the guide cylinder 9,
The output chamber 40 is communicated to the brake device 5 via the output port 29 ₂ provided in the fixed core 12. Further, the output chamber 40 houses the return spring 24 that exerts a spring force in a direction in which the plunger 13 is separated from the fixed core 12.

[0023] In the control valve 7 _2, the valve housing 15 ₂
Sliding hole 14 ₂ provided is intended to be formed smaller in diameter than the inner surface of the second guide tube portion 10 in the linear solenoid 6 _2, one end of the slide hole 14 _2, the second guide tube portion 10
Is coaxially connected to the inner surface through a step. Thus, the sliding hole 14
The spool 16 _{and second} end slidably fitted in the _2,
A plunger 13 supported movably in a fluid-tight manner by the second guide cylinder 10 is integrally connected. In addition, sliding hole 14 ₂
The other end is closed by a plug 25 screwed into the valve housing 15 _2, reaction chamber 41 formed between the other end of the plug body 25 and the spool 16 _2, coaxial to the plunger 13 and the spool 16 ₂ Is communicated with the output chamber 40 through a communication passage 42 formed in the output chamber 40.

[0024] The end of the spool 16 ₂ facing the reaction chamber 41 the first pressure receiving surface 30 ₂ is formed to receive the fluid pressure in the output chamber 40 Chi match for push fluid reaction force chamber 41, a plunger facing the output chamber 40 At the end of 13, ₂ and the second pressure receiving surface 31 for receiving the fluid pressure in the output chamber 40 is formed. And plunger 1
3 has a larger diameter than the spool 16 ₂ and has a second pressure receiving surface 31.
₂ of the pressure receiving area larger than the pressure receiving area of the first pressure receiving surface 30 _2.

The fluid pressure supply source 17 includes a valve housing 15 ₂
It is connected to the input port 35 ₂ provided in the reservoir 1
8, the release port 23 provided in the valve housing 15 ₂
Connected to ₂ . The Thus to sliding hole 14 ₂ of the inner surface, an annular groove 43 communicating with the input port 35 _2, release port 23 ₂
An annular groove 44 communicating with the is provided with axially spaced, annular recess 45 which communicates with the output chamber 40 via the communication passage 42 is provided on the outer surface of the spool 16 _2. Thus was leading to an annular recess 45 is an annular groove 43 when the spool 16 ₂ is moved to the linear solenoid 6 ₂ side, the spool 1
6 ₂ annular recess 45 when moved to the side away from the linear solenoid 6 ₂ so as to communicate with the annular groove 44, the relative position of the annular groove 43, 44 and an annular recess 45 is set.

[0026] In the second embodiment, as in the first embodiment, the linear solenoid 6 ₂ and the control valve 7 ₂ constitute together compactly, and to reduce the axial length of the valve housing 15 ₂ , by further reducing the size of the linear solenoid 6 _2, it is possible to reduce the size of the fluid pressure control apparatus 4 _2.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various small design changes can be made without departing from the present invention described in the appended claims. Can be performed.

[0028]

As described above, according to the present invention, the second guide cylinder is provided integrally with the valve housing such that the inner surface thereof is coaxially connected to the slide hole, and the second guide cylinder is provided with a fluid. A tightly and movably penetrating plunger is integrally coupled to the spool, and the valve housing is provided with an input port leading to a fluid pressure source and one of an output port leading to a hydraulic device and a release port leading to a reservoir. The fixed core has the other of the output port and the release port, and the plunger and the spool have a first pressure receiving surface on which the fluid pressure of the output port acts toward the fixed core, and a fluid at the output port. pressure is a broad second pressure receiving surface of the pressure-receiving area than the first pressure receiving surface is provided with acting toward the opposite side of the fixed core, Pau output to the pressure receiving area difference of both
The relatively small force obtained by multiplying the fluid pressure
To act as a reaction to the electromagnetic force of the solenoid.
Tei Runode, a linear solenoid and a control valve configured together compactly, and to reduce the axial length of the valve housing and the linear solenoid against the fluid reaction force
Electromagnetic force to be exerted can be made relatively small
As a result, the size of the linear solenoid can be reduced, and the size of the fluid pressure control device can be reduced as a whole.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment.

FIG. 2 is a longitudinal sectional view of a second embodiment.

[Explanation of symbols]

4 ₁ , 4 ₂ Fluid pressure control device 5 Brake device as fluid pressure device 6 ₁ , 6 ₂ Linear solenoid 7 ₁ , 7 ₂ Control valve 8 Air gap as non-magnetic portion 9 1st guide tube portion 10 2nd guide tube portion Reference Signs List 11 coil 12 fixed core 13 plunger 14 ₁ , 14 ₂ sliding hole 15 ₁ , 15 ₂ valve housing 16 ₁ , 16 ₂ spool 17 fluid pressure supply 18 reservoir 23 ₁ , 23 ₂ release port 29 ₁ , 29 ₂ output port 30 ₁ , 30 ₂ First pressure receiving surface 31 ₁ , 31 ₂ Second pressure receiving surface 35 ₁ , 35 ₂ Input port

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI F16K 31/06 385 F16K 31/06 385A (58) Fields investigated (Int.Cl. ⁷ , DB name) B60T 8/00 B60T 8 / 36 B60T 13/66 F16K 31/06 305 F16K 31/06 330 F16K 31/06 385

Claims (1)

(57) [Claims] 1. A coaxial first and second guide cylinder portion (9, 10) having a non-magnetic portion (8) interposed in an intermediate portion, and surrounding the first and second guide cylinder portions (9, 10). Coil (11)
And a fixed core (1) provided on the first guide cylinder (9) side.
A plunger (13) housed in the first and second guide cylinders (9, 10) so as to be able to approach and separate from 2), and a shaft corresponding to the amount of electricity input to the coil (11). linear solenoid give direction electromagnetic force to said plunger (13) (6 _1, 6 ₂₎ and; the valve housing (15 _1, 15 are first and second guide tube portion (9, 10) coaxial
_The spool (16 ₁ , 1) linked to and connected to the plunger (13) is inserted into the sliding hole (14 ₁ , 14 ₂ ) of ₂ ).
6 _2), a fluid pressure device (5), the fluid pressure supply source (17)
Control valve (7 ₁ , 7 ₂ ) slidably fitted so as to be able to switch between communication and disconnection with reservoir and reservoir (18)
The second guide cylinder (10) has a sliding hole (14 ₁ ,
14 ₂ ) and the valve housing (15 ₁ , 1
5 ₂₎ provided integrally, plunger second guide tube portion (10) penetrating freely closely and transfer fluid (13) is integrally connected to the spool (16 _1, 16 _2), the valve housing (15 ₁ , 15 ₂ ) have input ports (35 ₁ , 35 ₂ ) leading to a fluid pressure supply source (17), output ports (29 ₁ , 29 ₂ ) leading to a fluid pressure device (5) and a reservoir (18). Open port (23 ₁ , 2
3 ₂₎ one (29 _1, 23 ₂₎ are provided in the fixed core (12), the other of said output ports (29 _1, 29 ₂₎ and release port (23 _1, 23 ₂₎ (23 ₁ , 2
9 ₂ ), and the output ports (29 ₁ , 2) are provided on the plunger (13) and the spools (16 ₁ , 16 ₂ ).
9 ₂ ) The first pressure receiving surface (30 ₁ , 30 ₂ ) in which the fluid pressure acts toward the fixed core (12), and the output port (2).
The fluid pressure of 9 ₁ , 29 ₂ ) acts toward the opposite side of the fixed core (12) and the first pressure receiving surface (30 ₁ , 3)
0 ₂ ), the second pressure receiving surface (31 ₁ , 31) having a larger pressure receiving area.
₂ ) is provided , and the output port
DOO force obtained by multiplying the fluid pressure (29 _1, 29 ₂₎ is Li
A reaction force against the electromagnetic force near the solenoid (6 _1, 6 ₂₎
A fluid pressure control device characterized in that the fluid pressure control device operates .