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Piston valve

A technology of piston valve and piston, applied in the direction of sliding valve, control valve, safety valve, etc., can solve the problem of increasing the number of parts

Active Publication Date: 2008-06-25
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, additional work is required to assemble the piston valve
Also, when the spacer 200 or the stopper pin 190 is used, the number of parts increases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0032] The piston valve 1 in the first embodiment of the invention is used, for example, as a pressure regulating valve in a feed pump (not shown in the figure), which is used on a diesel engine in combination with a fuel injection pump. The transfer pump pumps fuel from the fuel tank and discharges it into the fuel supply pump. Piston valve 1 (pressure regulating valve) regulates the pressure of the fuel discharged from the feed pump.

[0033] As shown in FIG. 1 , the piston valve 1 includes a cylindrical body (a first body 2 and a second body 3 ), a piston 4 and a spring 5 . Said piston 4 is accommodated in the body. The spring 5 pushes the piston 4 against the pressure of the controlled fluid (fuel expelled from the feed pump) flowing into the body.

[0034] The body is divided into a first body 2 and a second body 3 .

[0035] The first body 2 is cylindrical and has openings at both ends. The first main body 2 has a piston sliding portion 2a on one end side of a substa...

no. 2 approach

[0062] In the piston valve 1 of the second embodiment of the present invention shown in FIG. One end is closed by the valve plug 16.

[0063] The valve plug 16 can be fixed to the second body 3 by forcibly inserting the valve plug 16 into the through hole ( FIG. 5 ), or by screwing the valve plug 16 into the through hole ( FIG. 6 ). On the opposite end of the closed through hole and the piston 4, and as the bearing surface of the spring 5.

[0064] In the above structure with the valve plug 16, the initial load of the spring 5 (valve opening pressure of the piston valve 1) can be easily adjusted by changing the connection position (connection depth) of the valve plug. As described in the first embodiment, the stopper 13 on the second body 3 (the end surface at one end of the second body 3 ) prevents the overshoot of the piston 4 so that the valve plug 16 does not fall from the through hole.

[0065] Similar to the first embodiment, the piston valve 1 in FIGS. 5 and 6 is desi...

no. 3 approach

[0067] As shown in FIG. 8 , in the piston valve according to the third embodiment of the present invention, the main body is structured such that the first main body 2 is inserted into the inner peripheral surface of the second main body 3 .

[0068] Similar to the first embodiment, a large-diameter cylindrical portion 2b is formed on the opposite side of the first body 2 in the longitudinal direction from the inlet 7, and has an inner diameter larger than that of the sliding hole 6 of the piston sliding portion 2a. A step portion serving as the valve-closing side seat surface 9 of the piston 4 is formed between the inner peripheral surface of the large-diameter cylindrical portion 2 b and the inner peripheral surface of the slide hole 6 .

[0069] As shown in FIG. 8 , the second main body 3 has a mounting hole 17 at one end of the cylindrical hole 12 , and the inner diameter of the hole is larger than the inner diameter of the cylindrical hole 12 . The second body 3 is connec...

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PUM

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Abstract

A piston valve includes a body having an inlet on one end side of the body, a relief hole that opens on a sidewall of the body, a piston slidably inserted in the body, a damper chamber formed in the body, and a spring disposed in the chamber and urging the piston toward the inlet. Controlled fluid flows into the body through the inlet, and is discharged through the relief hole. The piston is located between the inlet and the chamber in the longitudinal direction. An opening area of the relief hole is varied according to a position of the piston, in which the piston is balanced when pressure of controlled fluid applied to an inlet side-surface of the piston is equal to a sum of internal pressure of the chamber and reaction force of the spring, the sum being applied to a chamber side-surface of the piston.

Description

technical field [0001] The invention relates to a piston valve. Background technique [0002] As disclosed in patent application JP2000-240531A (ie US Patent No. 6289875), piston valves can be used as pressure regulating valves on fuel injection pumps. [0003] As shown in FIG. 12 , the piston valve includes a main body 100 , a valve plug 110 , a piston 120 and a spring 140 . A cylindrical hole runs through the main body 100 . The valve plug 110 closes the right end of the hole. The piston 120 is slidably inserted into the cylindrical hole. The spring 140 is disposed in a cavity (buffer chamber 130 ) between the piston 120 and the valve plug 110 , and pushes against the piston 120 . [0004] The cylindrical hole in the main body 100 is connected with a bushing 150 at its end (left end in FIG. 12 ) opposite to the valve plug 110 side. Said bush 150 defines an inlet for the inflow of controlled fluid and acts as a bearing surface for the piston, pressed against by the pis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M63/00F16K3/24
CPCY10T137/86879F16K15/025F16K17/0433
Inventor 島居宏行
Owner DENSO CORP