JP2559039B2 - Pressurized fluid regulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a pressurized fluid regulator, particularly for use in a vehicle power steering system, and more particularly a pressurized fluid source and typically a fluid recoil device for the power steering system. A device provided in a fluid circuit between the fluid utilization device and a coil and a first hole communicating with an inlet communicating with a source of pressurized fluid, slidably fitted therein and provided therein. A flow rate adjusting port connected to the fluid utilization device and a core forming a flow rate adjusting slider defining a first variable throttle between the flow rate adjusting port and the inlet; A first valve that slides in a controlled flow control solenoid valve and a second hole that communicates with a discharge port that communicates with a tank, is preloaded by a spring, and is exposed to a pressure that is fed to a fluid utilization device.
Reaction pressure of a power steering system of the type including a pressure regulating valve having a surface and with a discharge forming a second variable throttle for escaping the fluid circuit. The present invention relates to a pressurized fluid adjusting device for adjusting the pressure.

This type of pressurized fluid conditioning device is described in EP-A-0,109,085. In this specification, a pressurized fluid regulator adapted to regulate a fluid flow directed to a distribution valve of said power steering device to regulate the assistance power provided by the vehicle power steering device is a pressure regulating device. A pressure regulating slider, the pressure regulating slider of the valve comprising:
In order to keep constant the fluid flow directed to the distribution valve of the power steering device regulated by the flow regulating solenoid valve, it is adapted to be subjected to a pressure difference on both sides of the first variable throttle of the flow regulating solenoid valve. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a safe pressurized fluid regulating device in which the pressure of the fluid regulated by the flow regulating solenoid valve and directed to the fluid utilizing device never exceeds a predetermined maximum value.

To this end, according to a feature of the invention, in a pressurized fluid regulating device of the above type, the pressure regulating slider of the pressure regulating valve is exposed to the pressure of the tank and cooperates with a preload spring. have.

The invention is also particularly simple and compact in construction,
It is an object of the present invention to provide a pressurized fluid regulating device of the type described above, which operates reliably, has high reliability, and has a very small hysteresis.

Therefore, according to another feature of the present invention, the second hole in which the pressure adjusting slider of the pressure adjusting valve slides is formed in the flow rate adjusting slider of the flow rate adjusting electromagnetic valve.

According to this structure, the pressure adjusting slider of the pressure adjusting valve is exposed to the fluid pressure immediately downstream of the first variable throttle of the flow rate adjusting solenoid valve, so that a temporary and sudden occurrence in the circuit of the fluid utilizing apparatus occurs. Even the possibility of excessive pressure is eliminated to improve safety.

The above and other features and advantages of the present invention will be apparent from the following description of the embodiments with reference to the accompanying drawings.

The pressurized fluid regulating device M shown in FIG.
A flow regulating solenoid valve E including a tubular solenoid valve support 1 made of a non-magnetic material and screwed into the stepped socket 2 of
The body 3 comprises a series of fluid passageways as will be described below.
The electromagnetic valve support 1 has a longitudinal through hole 4 and supports an electromagnetic coil 5 connected to an electric control circuit (not shown) via a terminal 6, which electromagnetic coil is connected via a seal 8. A cover 7 screwed into the outer end of the hole 4 holds it in place on the support 1 and with respect to the body 3. The inner end of the support 1 has a recess which cooperates with the bottom of the socket 2 to form an annular end chamber 9 which is sealed against the bore 4 by an annular seal 10. Support 1
Also has an intermediate shoulder which cooperates with adjacent shoulders of the socket 2 to define an annular chamber 11 sealed on each side by a pair of annular seals. The support 1 also has an inner annular chamber 12 in the form of an evolute, which constitutes the inlet and which communicates with the bore 4 and which also has a longitudinal passage 13
Through the annular end chamber 9.

The core of the solenoid valve E is slidably fitted in the hole 4, and constitutes a flow rate adjusting slider 14 which is pressed against the bottom portion of the socket 2 of the main body 3 by the spring 15 which is in contact with the cover 7. The flow rate adjusting slider 14 has a central blind hole 16, which communicates with an inner end chamber 17 formed in the flow rate adjusting slider 14 on the side opposite to the spring 15 and is surrounded by a seal 10. It constantly communicates with the bottom portion of the socket 2. According to the invention, the pressure adjusting slider 18 of the pressure adjusting valve R is slidably fitted in the blind hole 16 and the rear chamber 19 is bounded on the other side by the bottom of the blind hole 16.
And the blind hole 16 is divided on the other side into an anterior chamber 20 defined by a closing member 21, which is screwed into the blind hole 16 and sealingly closes this hole from the end chamber 17. Separated. The pressure adjusting slider 18 is biased toward the closing member 21 by an adjusting spring 22 that abuts on the bottom portion of the blind hole 16 and also abuts on the annular end surface 190 of the slider 18. The pressure adjusting slider 18 is provided with two sets of circumferentially spaced openings 23 ', 23 "on the outer peripheral surface thereof, which are axially separated from each other.
The openings 23 "are two axially adjacent annular grooves 2 of the blind hole 16.
In cooperation with the annular surface 24 between 4'and 24 ", a passage or throttle σ that can vary depending on the position of the pressure adjusting slider 18 in the blind hole 16.
Form ₂ . The rear chamber 19 of the flow rate adjusting slider 14 communicates with the longitudinal outer groove 26 via the radial passage 25, and the outer groove 26
Communicates rearward with a chamber 27 formed in the hole 4 between the cover 7 and the flow rate adjusting slider 14, and communicates forward with the end chamber 17 via a longitudinal dust 28. The flow rate adjusting slider 14 has an annular groove 29 having an evolute shape on the outer peripheral surface thereof toward the front, and this groove 29 forming a flow rate adjusting port is an annular chamber 12 as an inlet of the support 1.
In cooperation with, forms a diaphragm σ ₁ which can vary depending on the position of the flow rate adjusting slider 14 in the hole 4. The annular groove 29 is always communicated with a radial passage 30 formed in the support 1 and serving as an outlet communicating with the intermediate annular chamber 11, and the front chamber 20 is provided with a radial passage 290 formed in the flow rate adjusting slider 14. Always communicate with. The main body 3 has an inlet passage 31 communicating with the pressurized fluid source S and communicating with the annular end chamber 9, and a discharge passage communicating with the hole 4 communicating with the end chamber 17 of the flow rate adjusting slider 14 and the tank 33. 32 and an outlet passage 34 communicating with the fluid utilizing device U and communicating with the intermediate annular chamber 11.

The adjusting device according to the invention operates in the following manner. In the rest position shown in FIG. 1, the flow rate adjusting slider 14 is brought into contact with the bottom portion of the socket 2 by the action of the spring 15, so that a pressure is applied between the annular chamber 12 as an inlet and the annular groove 29 as a flow rate adjusting port. Forming a restriction σ ₁ which gives the maximum passage area for the fluid between the fluid source S and the fluid utilization device U. The pressure adjusting slider 18 is normally in contact with the closing member 21 via the protrusion extending from the end surface 200 of the slider by the action of the spring 22, and at this position, the pressure in the outlet passage 34 leading to the fluid utilization device U is reduced. The anterior chamber 20 below and the passage 25,
The outer chamber 26, the duct 28, the end chamber 17, and the rear chamber 19 that is in constant communication with the tank 33 via the discharge passage 32 are isolated from each other. If an overpressure from the pressurized fluid source S occurs at this stage, this overpressure causes the inlet passage 31, the annular end chamber 9,
Passage 13, annular chamber 12, annular groove 29, passage 290 and annular groove 24 ″
And communicates with the front chamber 20 via the pressure adjusting slider 18 and acts on the annular end surface 200 of the pressure adjusting slider 18 to move the slider against the action of the adjusting spring 22, thereby opening the opening 23 ″ to the annular groove 24 ′ and opening.
The throttle σ ₂ between the chambers 20 and 19 is opened so as to communicate with 23 ′, and a part of the fluid from the pressurized fluid source S is diverted to the tank 33. In the adjusting operation mode, the flow rate adjusting slider by the magnetic field of the predetermined strength applied to the electromagnetic coil 5
By the action on 14, the slider 14 is slightly moved against the action of the spring 15, and the throttle σ ₁ is throttled to adjust the pressurized fluid to the fluid utilizing apparatus U. According to the present invention, the overpressure detected from the pressurized fluid source S and detected in the front chamber 20 regardless of the value of the variable throttle σ ₁ is detected by the flow rate adjusting slider 14
The pressure adjustment slider 18 can be moved so as to regulate the pressure delivered to the fluid utilization device U to the maximum value determined by the setting of the spring 22 without affecting the function of the flow adjustment device. This is because the slider 14 always receives the pressure in the tank 33 on both side surfaces thereof, and thus maintains the balance.

FIG. 2 is a circuit for a vehicle power steering system incorporating a pressurized fluid regulating device M according to the present invention as described above. The power steering system includes a distribution valve D, which is actuated by an input member 35 which is typically connected to the steering wheel and for controlling the assistance ram V. The distribution valve D directly receives the fluid from the pressurized fluid source S via the duct A, and this pressurized fluid source, like the pressure regulating valve R in the pressurized fluid regulating device M of the present invention, has its pump outlet side. A device for preventing excessive pressure is provided between the variable throttle and the tank 33. The power steering device further includes a fluid utilization device U,
A fluid recoil device is provided to actuate the input member 35 to impart a reaction moment to the input member 35 that resists the actuation moment of the distributor valve D. This fluid recoil device is pilot-controlled by a pressurized fluid regulating device M according to the invention arranged in a fluid circuit B between a source S of pressurized fluid and a fluid recoil device. A power steering device of this kind is described in EP-A-0,112,209 in the name of the Applicant, which is referred to for details.

[Brief description of drawings]

FIG. 1 is a sectional view of a pressurized fluid regulating device according to the present invention, and FIG.
The drawing is a schematic fluid circuit diagram showing a preferred application example of the pressurized fluid regulating apparatus of the present invention. E ... Flow rate adjusting solenoid valve, M ... Pressurized fluid adjusting device, R ...
... pressure control valve, S ...... pressurized fluid source, U ...... fluid utilization device, sigma _1, sigma _{2 ......} diaphragm, 1 ...... solenoid valve support, 2 ...... stepped socket, 3 ...... body, 4 ...... Through hole, 5 ...... Electromagnetic coil, 7 ...... Cover, 12 ...... Annular chamber (inlet), 14 ...... Flow rate adjusting slider, 15 ...... Spring, 16 ...... Blind hole, 17 ...
… End chamber, 18 …… Pressure adjustment slider, 19 …… Rear chamber, 20
... front chamber, 21 ... closing member, 22 ... adjusting spring,
24 '... Annular groove (exhaust port), 25 ... Radial passage, 26 ...
… Longitudinal outward groove, 28 …… longitudinal duct, 29 …… annular groove (flow rate adjustment port), 30 …… radial passage (outlet), 31…
… Inlet passage, 32 …… Discharge passage, 33 …… Tank, 34 …… Outlet passage, 190,200 …… End face.

Claims (9)

(57) [Claims] 1. A fluid circuit between a pressurized fluid source (S) and a fluid utilization device (U), comprising: a coil (5) and a pressurized fluid source (S). Is slidably fitted in the first hole (4) communicating with the communicating inlet (12),
A flow rate adjusting slider (14) that limits the first variable throttle (σ ₁ ) is formed between the flow rate adjusting port (29) and the inlet (12) that are provided inside and communicate with the fluid utilization device (U). It is slid in a second hole (16) communicating with a flow control solenoid valve (E) equipped with a core and a discharge port (24 ') communicating with the tank (33) and is preloaded by a spring (22). , A second variable throttle (σ ₂ ) having a first surface (200) exposed to the pressure fed to the fluid utilization device (U), and with a discharge port (24 ′) for escaping the fluid circuit. Which includes a pressure adjusting valve (R) having a pressure adjusting slider (18) forming the pressure adjusting slider (18), the pressure adjusting slider (18) of the pressure adjusting valve (R) adjusts the pressure of the tank (33). Pressurized fluid conditioning characterized by having a second surface (190) cooperating with an exposed preload spring (22) apparatus. 2. A flow rate adjusting slider (1) for a flow rate adjusting solenoid valve (E), wherein a second hole (16) in which the pressure adjusting slider (18) slides is provided.
4) The pressurized fluid regulating device according to claim 1, which is formed inside. 3. The flow rate adjusting port (29) has a flow rate adjusting slider (1).
An outlet (3) formed on the outer peripheral surface of (4) and communicating with the first hole (4)
0) It is always communicating with 0), The pressurized fluid adjusting device according to claim 2 characterized by the above-mentioned. 4. The second hole (16) communicates with the flow rate adjusting port (29) through the first end (20), and the second end (19) for accommodating the preload spring (22) is provided. Through the tank (3
The pressurized fluid according to claim 3, characterized in that it communicates with internal passages (25, 26, 28, 17) provided in the flow rate adjusting slider (14) so as to communicate with 3). Adjustment device. 5. The second hole (16) is a blind hole and communicates with an end chamber (17) communicating with the tank (33) at a first end, and the first end of the second hole (16) is closed. 5. The pressurized fluid regulating device according to claim 4, which is closed by a member (21). 6. A longitudinal direction in which an internal passage of the flow rate adjusting slider (14) communicates with the second end (19) and the end chamber (17) of the first hole (4) and the second hole (16). A pressurized fluid regulating device according to claim 5, characterized in that it has at least one longitudinal groove (26) in communication with the duct (28). 7. A first hole (4) is formed in a solenoid valve support (1) fitted in a stepped socket (2) of a body (3), a source of pressurized fluid (S), a fluid. The fluid passages (31; 34; 32) communicating with the utilization device (U) and the tank (33) have a main body (3).
The pressurized fluid adjusting device according to any one of claims 1 to 6, which is formed inside. 8. A coil (5) of a solenoid valve (E) is held on a support (1) by a cover (7) closing the first hole (4). 7. The pressurized fluid adjusting device according to item 7. 9. A preload spring (1) having a solenoid valve (E) disposed between a cover (7) and a flow rate adjusting slider (14).
Claim 8 characterized in that it includes 5)
The pressurized fluid adjusting device according to the paragraph.