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A fuel injection device and anti-return technology, which can be applied to fuel injection devices, special fuel injection devices, fuel injection devices with oil reservoirs, etc. cost, the effect of improving mechanical efficiency
Active Publication Date: 2017-05-24
CHINA FIRST AUTOMOBILE
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Abstract
Description
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[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a fuel injection device with weak leakage and anti-oil return. The service life of the electronically controlled fuel injector, while reducing the oil return volume of the electronically controlled fuel injector, reducing the loss of high-voltage energy consumption, and improving mechanical efficiency
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Embodiment 1
[0029] Such as Figure 1~Figure 6 As shown, the weak leakage anti-return fuel injection device in embodiment 1 is mainly composed of injector body 1, throttle orifice plate 2, control valve seat 3, armature 4, valve core 5, sealing gasket 6, and adjusting gasket 7 , Armature preload spring 8, electromagnet tight cap 9, pin 10, connecting ring 11, electromagnet assembly 12, stroke adjustment ring 13, control panel 15, control panel preload spring 16 control piston 17, preload spring 19, The transition block 21, the oil nozzle coupler 22, the oil nozzle tight cap 23 and the armature guide sleeve 30 etc. are composed.
[0030] The control valve seat 3 is assembled in the upper chamber of the fuel injector body 1 and is threadedly connected with it, and the throttle orifice 2 is fixed between the control valve seat 3 and the fuel injector body 1; the control piston 17 is assembled in the central through hole of the injector body 1, and the upper part of the control piston 17 is m...
Embodiment 2
[0043] Such as Figure 8 As shown, the structure of embodiment 2 is basically the same as that of embodiment 1, so the similarities will not be repeated. The difference between embodiment 2 and embodiment 1 is: the weak leakage anti-oil return fuel injection device in embodiment 2 has added a push rod adjusting gasket 18 between the upper end of the pretension spring 19 and the injector body 1; and will implement The control piston 17 in Example 1 is shortened, and a push rod 20 is added between the shortened control piston 17 and the needle valve. On, the lower end of pretension spring 19 is supported on the step.
Embodiment 3
[0045] Such as Figure 9 As shown, the structure of embodiment 3 is basically the same as that of embodiment 2, so the similarities will not be repeated. The difference between embodiment 3 and embodiment 2 is that the weak leakage anti-oil return fuel injection device in embodiment 3 is provided with a return spring 14 between the control valve seat 3 and the armature 4, and the upper part of the control valve seat 3 is provided with An annular valve seat boss 31, the return spring 14 is sleeved on the valve seat boss. In addition, the armature 4 in Embodiment 3 is composed of an armature disc 41 and an armature rod 42, the armature disc 41 is circular, and the upper surface of the armature disc 41 is provided with at least one radial groove 411; the armature rod 42 It is a cylindrical ring, and the armature disk 41 and the armature rod 42 are laser welded as one.
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Abstract
The invention relates to a weak leakage oil return preventing fuel injection device. The weak leakage oil return preventing fuel injection device comprises an oil injector body, a throttle orifice plate, a control valve seat, an armature, a valve core, an adjusting gasket, an armature pre-tightening spring, an electromagnet tightening cap, an electromagnet assembly, a stroke adjusting ring, a control piston, a pre-tightening spring, a transition block, an oil nozzle matching part and an oil nozzle tightening cap. The weak leakage oil return preventing fuel injection device is characterized by further comprising a sealing pad, a control disc, a control disc pre-tightening spring and an armature guide sleeve; the sealing pad is arranged on the upper portion of the valve core in a sleeving mode and located below the adjusting gasket; an annular step is arranged on a circumferential ring at the head of the control piston; the control disc pre-tightening spring is arranged on the annular step at the head of the control piston in a sleeving mode; the control disc is arranged on the upper portion of the control disc pre-tightening spring; and the upper surface of the control disc is in contact fit with the throttle orifice plate. According to the weak leakage oil return preventing fuel injection device, the problem that the sealing leakage quantity is increased due to abrasion caused by movement of a control valve can be solved; the service life of an electronic control oil injector is prolonged; and meanwhile, the oil return quantity of the electronic control oil injector is decreased, the high-pressure energy consumption loss is reduced, and the mechanical efficiency is improved.
Description
technical field [0001] The invention relates to a weak leakage anti-oil return fuel injection device, which belongs to the technical field of internal combustion engines, especially high-pressure common rail fuel systems. Background technique [0002] The fuel injection device is a key component of the high-pressure common rail fuel injection system. Now that the injection pressure requirements of the fuel injection device continue to increase, the hydraulic pressure at the seal of the control valve also increases, and the pre-tightening force at the control valve increases accordingly, which will Affects the response of the solenoid valve. [0003] In the prior art, in order to solve the problem of reducing the preload, most control valves are sealed with flat valves to increase the contact area; or the sealing end of the control valve is not subjected to hydraulic pressure in the axial direction, but only to radial force. This kind of control valve structure can seal high...
Claims
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Application Information
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