JPS6053660A - Fuel injection valve - Google Patents

Abstract

PURPOSE:To enable fuel to be supplied by an injection pump of in-line or distributor-injection system, by providing an opening and closing means which communicates a feed passage to a drain passage when a control means closes a nozzle by urging a valve body. CONSTITUTION:An opening and closing means of a nozzle needle 90, when its upper piece 93 is lowered, closes a nozzle 83, conducting a feed passage 4 to a drain passage 5 through a groove 85, hole 71 and a groove 62. Accordingly, a pump 2 requires only a small loss of its driving power by enabling a pressure of fuel supplied from the pump 2 to be decreased. While the pump 2, eliminating any necessity for being a complicated fuel supply source of constant pressure, can use an intermittent injection pump at a low price with simplified construction.

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a fuel injection valve for an internal combustion engine. BACKGROUND ART Solenoid and electrostrictive actuators are known as actuators for opening and closing the LTL injection valve.1. ing. The electrostrictive actuator is superior in response compared to the N1T/F, but it has the problem of not being able to obtain a large rift R. In order to eliminate Mi during this period by 1°, the inventors of the present invention have already proposed in Japanese Patent Application No. 1983-3637 a method in which an electrostrictive acticoator is used as a trigger for opening and closing the valve. According to this proposed system, the fuel is supplied through the accumulator 1 node, which is suitable for use in a row type 9J pump that is cheap and convenient. For example, when the valve closes, does it turn off? The problem arises as to how to release the discharge pressure of the injection pump. Purpose of invention Tree 5 Ximen t Go Vj, in view of the above points, KL attack plan
The object of the present invention is to make it possible to perform the supply by means of a size-type or distribution-type injection pump. Barrel structure of the invention A nozzle body of a fuel injection valve according to the present invention. 1) A feed passage and a doorway communicating with the 1'1 tank, a nozzle communicating with the feed passage and opening to the outside are formed, and a valve body capable of opening and closing the nozzle is provided. . The valve body is energized by the control means to open and close the nozzle. The feed passage and the open passage are in direct communication with an opening/closing means, and when the control means energizes the valve body to close the nozzle, the opening/closing means is connected to the feed passage. The present invention will be explained by way of an example.
The fuel in tank 3 is intermittently supplied. Pump 2 is a burnt distribution type injection pump that is commonly used in the past and has the same size as the internal combustion engine gate [circumference: 1 °C / 17 °C]. 1. There is no need to make the 1st term particularly durable; it should be constant. The cooling sink 10 is formed by fitting the horn into the multi-rib nut 12. There is a cylindrical bore in the nozzle hole 11, a cylindrical bore 14 with a larger diameter than the bore 13 in the retaining nut 12, and a stepped cylindrical space in the Juri coupling 10. is formed. In this space, the upper part of the figure is r), clothes (in the city), distorted type hinge unit 0-20, pony/fiberstone 30, suspension spring 4O-j-11, disk bead 5o, 11 cylinder body 60 .Second Day 71 Nsubi-, Sufu 0:
tl:・, ↑ξ) The nozzle body 80 is large.
Ru. Nozzle bore 1. , p' l l - first distance piece 50. Shirinshio body 6a). Second distance piece 70: t◇, I', nozzle body, f80 is 1N

[T by knock bottle without ζ
The relative positions of L and L are controlled by 6 and these f'+ members are connected to feed passage 4'' 2 and drain passage 5.
is formed. The feed passage 4 is connected to the pump 2 via a feed boat 15 provided in the second part (ξ) of the nozzle holder '11 and an external conduit, and the other end of this passage 4 is formed below the nozzle body 80. It faces into the fuel pool 81. The drain passage 5 is located above the nozzle holder 11 i<+
It is connected to the fuel tank 3 via a private boat 16 and an external pipe line. The other end of this passage 5 extends approximately at the center 1 of the nozzle body -80. The F end 82 of the nozzle body 80 is a retaining naso)1
It protrudes from nine holes 17 provided at the lower end of the hole 2, and has a J-shaped nozzle 83 at its tip for discharging fuel. A nozzle needle 90 that can open and close the spout 83 is accommodated in the nozzle body 80 . The nozzle needle 90 is movable up and down within the nozzle body 80, and its range of motion is approximately 50 μm. The nozzle needle 90 has a valve seat 84 whose lower end is provided at the tenth end 82 of the nozzle body 8°, and the nozzle needle 90 also has a "-9'?" 4
is regulated by the second distance piece 70. The nozzle needle 90 is divided into upper and lower halves with a large diameter part 91 located in the center. The 900 division part of the nozzle needle is a little rough. A coil spring 92 is applied to the annular four parts 95 formed there.
The first one is divided. '7 of upper nozzle needle 90...I,
・Always energize the two pieces 93 and the lower bee:xg4 to 1-F.
When the pressure is above 100, the rhinodal needle 9 () is pushed upwards at the fuel f1 distance (it is thick, that is, it is formed in the 2 F direction). The first small child part 9
The stepped portion between 6 and the large diameter portion 91 is l'R11).
Become located within 1, the penalty is , /3;ko,
(The recess 95 in which the J-rest 1 ring 92 is provided is
．． It is electrically connected to the fuel tank 3 via the parn passage 5. The first part is formed on the upper part of the nozzle needle 9 (). Tab1/Tshabin97shi:1. Large diameter +7
1 (smaller diameter than 91, second disk bead 9
It penetrates the center hole 71 of Q and protrudes into the silling body (-゛. One end of the pressure pin 97 comes into contact with the lower sloped surface of the passive piston lOO, which is housed in the cylinder body 60 so as to be slidable in the axial direction. The movable range of this passive piston 100 is 100 μm, which is regulated by the nozzle needle 90 and limited by the upper first distance piece 50. A communication hole 51 is bored in the center of the distance piece 50. 2 Through this communication hole 51, a pump 1.3 which will be described later
] The pressure within [11] acts on the upper end surface of the piston IOQ. The upper surface of the distance piece 50 and the lower surface of the pump piston 30 are opposed to each other, and a pump chamber 31 is formed between them. A disc spring 40 that constantly biases the pump piston 30 in two directions is housed in the pump chamber 31. The pump piston 30 is driven by the expansion and contraction of the electrostrictive actuator 20 provided above, thereby changing the volume within the piston 31 and performing a pumping action. For this reason. An 01.1 ring 32 for sealing is fitted onto the outer periphery of the pump piston 30. Electrostrictive actuator 20 (thin circle f: approximately 50 λ-shaped electrostrictive elements are laminated to form a cylindrical shape.The electrostrictive element is a helical material called PZT, and is made of phosphoric acid, zirconium, etc. If you mark a square of 500V in the direction of the 7th leaf of a metal whose main component is acid and lead, it will extend by 1m. When 500V is applied in the direction, the whole becomes °℃
5 (An extension of 1l1m is obtained. This t) ↑, 1
The first step is to release 1E or apply a slight reverse voltage. Ba5
It undergoes a contraction of 0 μm and returns to its original length. Perform L-C on the controller of the voltage application/removal section. The feed passage 4tJ feed ports 1 and 15 are already electrically connected to the fuel reservoir 81, but a seal is installed in the middle of the feed passage 4tJ, and one branch is connected to the other part 2, which is also electrically connected. The feed passage 4 is passed through a radially extending groove 61 provided on the west side of the cylinder body 60. Degri + Il piston 100
1 Nozzle knee 1
- There is conduction 1- on two sides of the large diameter portion (1) of the rule 90. on the other hand,
1. The line passage 5 (-T coilless spring 512 is connected to the recess 95 in 16 steps, but is there an open circuit during the process? The cylinder body 60 branches into a radial groove 62 formed on the lower surface of the cylinder body 60 to communicate with the center hole 71 of the C resistance heath 70 . The device t:f of this embodiment has the above configuration and operates as follows to perform the injection. When the injector 1 injects the viscous material 91 from 11'' to During this period, the pump 2 regularly and intermittently sends fuel I to the injection valve 1. This "Send Jl, burn 21, Fu, E F boat 15 I!! (
Enters the fuel injection valve 1 and passes through the feed passage 4 to the fuel pool 8
1 is transferred to the 1st location. This fuel pressure now acts via the groove 61 on the upper end face of the passive piston 100 and forces it downward [pressing the nozzle needle 90 downwards. Therefore, [the nozzle needle 90 closes the spout 83]. 4'1 of the fuel pool 81 will be ejected from the nozzle 83. At this time 7, burn t[tyo d85, introduce hole 71 of distance piece 70, I:'762; Yamashi CI' Lanef river i' Exit sea 11'' from 5' A
I, Ru. Female, -2 total 1. -n″5th generation actuator 2
At 0, a residual pressure of 500 V is applied as an impression, and at 1, fu is set to a weeping p. - Trying to perform fuel injection 2. n3 j tears
Apply a reverse voltage of 1' to the voltage 1 of the actuator 20 by W (or 7 or 7).
\The strain actuator 20 contracts, and the volume of the pump chamber 31 is reduced to 1. Expanded 'C successj Noviston J()0geko・
Upper piece 93
2. rzui゛sit J-rise'. Passive piston 10
(1ζ-1, to ensure that 11A is 11A quickly, it is necessary to increase the area of passage 1 of 1ζ-1, r 61, and to make sure that L is 114.Pump chamber 3). - Ri Jr.
When the product is 1 (in・14), 6% 610) jil j
'? 5 To the four Iji products:! :, 0.1 ・= tl,
, r; p14 dj+Di is O fl,
i +lIIMI2', under rat no X runy 1 nil D
Ofa-Push C"IN"f 83 close operation (11C actual Q i. Passive piston 100 rises and above i?'ia surface is de-stunned, Subis 500F j': f% white ?(罎'
7. Block the conduction between the communication holes 51 and 61. [7. Introducing the low pressure state of the pump chamber 31.
J piston 10'0 (maintains its position. At this time, it loses its downward suppressing force, -)
The force of the coil spring 92 is attached to the upper piece 93 of the
・ζ Engineering (upper JTL-Sonodai 8?'tiS',)
] - The piano chant is def;, under the dresser piece 7° tiiA
Densely layered on the surface 2. Hole 71? ', '# 85 (- conduction is detected [45J]). The result of ζ is the result;
Stop discharging to juway 51. The office lady, who is being treated, burns
i+t-pressure rises rapidly. 100 air IE 12↓"2, nozzle needle 9°O)
``CIYt,' lj 83 J, 'J It erupts outside Ui.
] to -fjt distortion actuator 20 Fi 00 V
The voltage is applied. As a result, electrostrictive J1゛5 Akubouni death 2o J1 middle length 17, bomb'b h1:)1'
pym'i i 1 blue 1. ．． ．． 'C, -1:': Press i pressure and [7 received order pin y, ) turn 101J 1-. 'Fgede 77! ; Push down the needle 0 and close the 2nd nozzle 834' and stop the 1st nozzle 135. 12), 1-θ), 1, Uni-/' Sluni, -F
/L/ D 00)'f The jet rJ 83 is blocked when the brim piece 93 is lower IX and drying, but at this time, η785. Since the feed passage 4 and the drain] U1↓ passage 5 are electrically connected via IL71 or (B!M?62), the EE force of 4B f'i supplied from the pump 2 is reduced. You can say +i-, pump 2'A 1ffj
l @I) Loss of power is small and C is distorted. Also for this reason,
Pumps 2 and c do not have to be complex constant LE fuel v1 sources. An intermittent injection pump with a simple structure and low cost can be used, and therefore, it is easy for the fuel injection valve 1 to perform high IEI direct operation. Furthermore, according to this embodiment, even if the upper piece 93 of the nozzle needle 90 is in the upper row, the output of the fuel reservoir 81 exceeds a certain level until the output of the fuel reservoir 81 exceeds a certain level.
The lower piece 94 closes the nozzle 83 due to the force, and the pressure rises to a high level (A), which can be maintained. In particular, the rotation of the inner tunnel is slow, and the oil supply of the pump 2 is interrupted. Rate (-/
sCc ) is small, the lower piece 94 of the nozzle needle 90 opens the valve 1iIQ ffF +! 'B automatically adjusts Jl, - this makes the jet! 1) IEN 1 1 1ξ
) can be carried. In the above embodiment, the nozzle needle 90 is used as a stationary means to close the 181''83.
Distortion 〒(Aku1, Eta2() is used, but this is substituted, So1.・NoiF,?l・Use′C is also good.SunaIrich,So】nonoi1 In ゛, L ribbon buoy Y is also often used. Also, 1": 1 contact nozzle needle 9o5, kite QjlJ is also good. Also, nozzle knee
Shall I spend $90 on fitυ? 00 oil injection valve 1 is configured to be oily from the outside, and 11 oil is good. Effectiveness of the invention (Layer 1+?)
% q' + 1ft 't J valve as a pump to combine the fuel τ'I (2 m in C1 internal combustion engine); 3 row 71;
'0 using '21 Bosoff. [Residence Ipa 1 Injection 9] It is possible to perform a simple 4M Ii climbing actual damage 5j from Ll''-force hk when the valve is closed.

[Brief explanation of drawings]

The figure is a l-i:rT view showing an embodiment of the water source 1.
R7ri. 4,...Feed 1, 5...Drain 1, 20...Electrostrictive te'11. Actuator (1 means of starvation control) -80...Nozzle body, 83
...1 zo ("], 90... nozzle body (
Valve body) +93′°゛°゛Atsupa piece (opening/closing means). 94...Lower peace special 81 appearance 1 person f1ζ ceremony 1L day wood grain ν)11. ｊjlj ;l゛, Akira44□;Goi[I[′毛）9[ze"Xued1岨Representative patent attorney 671, 郎4f□tIl1士西7i!4 11th;gu patent attorney
Middle 111. 1. q B1 Patent Attorney Yama +-+ ll7j Nohato Nishiyama Patent Attorney Continued from page 1 0 Inventor Masayuki Abe 1 Iwatani, Shimouzaku-cho, Nishio City
Inventor: Kazuhide Watanabe 1, Iwatani, Shimohazu-cho, Nishio-shi
Number 4 in the research center Japan Auto Parts General Co., Ltd. Number 4 Japan Auto Parts General Co., Ltd.

Claims (1)

[Claims] 1. A nozzle body in which a feed passage and a drain passage communicating with a fuel fl tank are formed, and a nozzle opening communicating with the feed passage and opening to the outside is bored; A valve body that is housed in the body and can open and close the nozzle; a control means that forces the valve body to open and close the nozzle; and an opening/closing means, the opening/closing means [required, said control means] having a special purpose of bringing said feed and drain passage into communication when said valve body is energized to close said injection port. Valve. 2. - The valve body is composed of an upper piece and a lower piece, the upper piece is the opening/closing means described in 1, and the lower piece can open and close the spout, and the upper piece and the lower piece are The 4r, 'S I'l injector described in the range 1' of the special i''Kn request is characterized in that it is always focused on the method of providing a gap to the phase!L.