CN110529317A - A fuel injection valve sleeve assembly - Google Patents

Abstract

The invention belongs to the technical field of fuel injectors, and discloses a fuel injection valve sleeve assembly, which includes a valve sleeve body and a throttle sleeve. Wherein, the opposite sides of the valve sleeve body are respectively provided with a working tank and a control tank, and the working tank and the control tank are connected through the first throttling hole, and the side wall of the working tank is provided with an oil inlet hole connected to the outside. The flow sleeve is clamped on the bottom of the working tank or the control tank. The opposite sides of the throttle sleeve are respectively provided with a second throttle hole and an inner counterbore. The opening at one end of the second throttle hole is located in the inner counterbore. The hole communicates with the first throttling hole, and the diameters of the first throttling hole and the second throttling hole are both smaller than the inner counterbore. In the present invention, the separate clamping design corresponding to the valve sleeve body and the throttling sleeve reduces the difficulty and cost of processing and preparation, and can realize secondary throttling at a lower cost.

Description

A fuel injection valve sleeve assembly

technical field

The invention relates to the technical field of fuel injectors, in particular to a fuel injection valve sleeve assembly.

Background technique

The fuel injector is a device that injects fuel regularly and quantitatively into the combustion chamber of the engine according to the operating conditions of the engine and the working sequence of the cylinders.

In the existing fuel injection valve sleeve structure, the oil outlet orifice has only one stage of throttling, that is, it only throttles once. This structure is relatively simple in processing and manufacturing, but in use, due to the weak throttling effect, the injection When the fuel flow rate is high, the risk of cavitation on the outlet end face of the oil outlet orifice is relatively high, which affects the reliability of the fuel injection valve sleeve and the entire injector, shortens its working life, and increases the use cost.

In order to solve the above problems, in the prior art, the oil outlet orifice on the valve sleeve of the fuel injection valve is usually processed into a two-stage throttling structure, that is, the oil outlet orifice is composed of the oil outlet orifice, the diffuser area, the outlet The constriction part consists of three sections. This structure can realize two-stage throttling of high-pressure oil, reduces the flow rate of high-pressure fuel, and reduces the risk of cavitation on the outlet end face of the oil outlet orifice. However, with this oil outlet The processing and molding of the fuel injection valve sleeve of the orifice is relatively difficult, and it is difficult to accurately control the flow of the throttling parts at both ends during the processing, the reject rate is high, and the processing cost is high.

Contents of the invention

The object of the present invention is to provide a valve sleeve assembly of a fuel injection valve, which can achieve the effect of secondary throttling at a relatively low cost.

For reaching this purpose, the present invention adopts following technical scheme:

A fuel injection valve sleeve assembly, comprising:

A valve sleeve body, the opposite sides of the valve sleeve body are respectively provided with a working groove and a control groove, the working groove and the control groove are connected through the first throttle hole, and the side wall of the working groove is provided with There is an oil inlet hole connected to the outside;

The throttling sleeve is clamped on the bottom of the working groove or the control groove. The opposite sides of the throttle sleeve are respectively provided with a second throttle hole and an inner counterbore. The second throttle hole One end opening is located in the inner counterbore, the inner counterbore communicates with the first throttle hole, and the diameters of the first throttle hole and the second throttle hole are both smaller than the inner counterbore.

Preferably, an outer counterbore is provided on the side of the throttling sleeve away from the inner counterbore, the diameter of the second orifice is smaller than that of the outer counterbore, and the other end of the second orifice An opening is located within the outer counterbore.

As a preference, the outer wall of the throttling sleeve is provided with an annular slot, and when the throttling sleeve is interference-fitted at the bottom of the control groove or the working groove, the control groove or the working groove The inner wall of the groove is deformed and snapped into the annular locking groove.

Preferably, the working groove includes a piston main groove and a working locking groove arranged at the bottom of the piston main groove, one end opening of the first throttle hole is located in the working locking groove, and the throttling sleeve is The Ying card is installed in the working card slot, and the oil inlet hole is arranged on the side wall of the piston main groove.

Preferably, the control groove includes a sealing cone groove and a control bottom groove arranged at the bottom of the sealing cone groove, and the other end opening of the first throttle hole is located in the control bottom groove.

Preferably, the control groove includes a control sinker and a control clamping groove arranged at the bottom of the control sinker, one end opening of the first throttle hole is located in the control clamping groove, and the throttling sleeve is The Ying card is installed in the control card slot and connected with the valve sleeve body by welding.

Preferably, the working groove includes a piston through groove and a working bottom groove arranged at the bottom of the piston through groove, the oil inlet hole is arranged on the side wall of the piston through groove, and the first throttle hole The other end of the opening is located in the operation bottom groove.

Preferably, an outer taper groove is provided on the side of the throttling sleeve away from the inner counterbore, and the other end of the second throttling hole communicates with the outer taper groove.

Preferably, a piston rod is also included, and the piston rod is arranged in the working groove.

Preferably, a sealing steel ball is further included, the sealing steel ball is arranged in the control groove, and can block or open the first throttle hole under the control of the control device.

Beneficial effects of the present invention:

Corresponding to the split clamping design of the valve sleeve body and the throttle sleeve, the corresponding processing technology and assembly technology are more mature and reliable, making the processing parameters accurate and easy to control, reducing the difficulty and cost of processing and preparation, the first throttle hole and the second The orifice cooperates together to achieve the effect of two-stage throttling, which reduces the flow rate of high-pressure fuel, thereby reducing the risk of cavitation caused by fuel to the sealing cone surface of the valve sleeve when the pressure suddenly drops, thereby prolonging the service life of the valve sleeve. Service life and reliability of work.

Description of drawings

Fig. 1 is a schematic cross-sectional view of a fuel injection valve sleeve assembly according to Embodiment 1 of the present invention;

Fig. 2 is a schematic cross-sectional view of the cooperation between the valve sleeve body and the throttle sleeve in the valve sleeve assembly of the fuel injection valve according to Embodiment 1 of the present invention;

Fig. 3 is a schematic cross-sectional view of the valve sleeve body in the valve sleeve assembly of the fuel injection valve according to Embodiment 1 of the present invention;

Fig. 4 is a schematic cross-sectional view of the throttle sleeve in the valve sleeve assembly of the fuel injection valve according to the first embodiment of the present invention;

Fig. 5 is a schematic cross-sectional view of the cooperation between the valve sleeve body and the throttle sleeve in the valve sleeve assembly of the fuel injection valve according to the second embodiment of the present invention;

Fig. 6 is a schematic cross-sectional view of the valve sleeve body in the valve sleeve assembly of the fuel injection valve according to the second embodiment of the present invention;

Fig. 7 is a schematic cross-sectional view of the throttle sleeve in the valve sleeve assembly of the fuel injection valve according to the second embodiment of the present invention.

In the picture:

1. Valve sleeve body;

11, working groove; 111, piston main groove; 112, working card groove; 113, piston through groove; 114, working bottom groove;

12. Control groove; 121. Sealing cone groove; 122. Control bottom groove; 123. Control sinking groove; 124. Control card groove;

13. The first throttle hole;

14. Oil inlet hole;

2. Throttle sleeve;

21. The second throttle hole;

22. Inner counterbore;

23. Outer counterbore;

24. Ring slot;

25. Outer taper groove;

3. Piston rod;

4. Sealed steel ball.

Detailed ways

Embodiments of the present invention will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise clearly stipulated and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or a mechanical connection. A connection can also be an electrical connection, a direct connection, or an indirect connection through an intermediary, or an internal connection between two elements or an interaction relationship between two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the description of the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first feature and the second feature, or include the first feature Not in direct contact with the second feature but through another feature therebetween. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

Embodiment one

As shown in FIGS. 1-4 , this embodiment provides a fuel injection valve sleeve assembly, including a valve sleeve body 1 and a throttle sleeve 2 . Wherein, the opposite sides on the valve sleeve body 1 are respectively provided with a working groove 11 and a control groove 12, and the working groove 11 and the control groove 12 are connected through the first throttle hole 13, and the apertures of the working groove 11 and the control groove 12 are larger than The first throttle hole 13, the side wall of the operation tank 11 is provided with an oil inlet hole 14 connected to the outside, the throttle sleeve 2 is clamped on the bottom of the operation tank 11 or the control tank 12, and the throttle sleeve 2 is opposite The two sides are respectively provided with a second throttle hole 21 and an inner counterbore 22, one end of the second throttle hole 21 is located in the inner counterbore 22, and the inner counterbore 22 is connected to the first throttle hole 13, and the first throttle hole 13 and the diameter of the second orifice 21 are smaller than the inner counterbore 22.

In the present invention, corresponding to the split clamping design of the valve sleeve body 1 and the throttle sleeve 2, the corresponding processing technology and assembly technology are more mature and reliable, making the processing parameters accurate and easy to control, reducing the difficulty and cost of processing and preparation, the first The orifice 13 and the second orifice 21 cooperate together to realize the effect of two-stage throttling, reduce the flow velocity of high-pressure fuel, and further reduce the cavitation caused by fuel to the sealing cone surface of the valve sleeve when the pressure suddenly drops. Risk, thereby prolonging the service life of the valve sleeve and the reliability of work.

Specifically, the valve sleeve assembly of the fuel injection valve of the present invention also includes a piston rod 3, the piston rod 3 is arranged in the working groove 11, a control chamber is formed between the end of the piston rod 3 and the working groove 11, and the working groove 11 and the control groove When 12 is disconnected, the fuel outside the assembly enters the control chamber through the oil inlet hole 14, and the oil pressure in the control chamber increases, pushing the piston rod 3 away from the valve sleeve body 1, blocking the nozzle hole on the injector shell, No fuel injection, when the working groove 11 and the control groove 12 are connected, the fuel in the control chamber flows to the control groove 12 through the first throttle hole 13 and the second throttle hole 21, the oil pressure in the control chamber decreases, and the piston rod 3 Under the action of the hydraulic pressure and the return spring, the valve sleeve body 1 is approached, and the nozzle hole on the injector housing is opened to allow fuel injection.

More specifically, the valve sleeve assembly of the fuel injection valve of the present invention also includes a sealing steel ball 4, which is arranged in the control groove 12 and can block or open the first throttle hole 13 under the control of the control device. , when the throttling sleeve 2 is clamped on the bottom of the operation tank 11, the sealing steel ball 4 can directly block the first throttle hole 13, and when the throttle sleeve 2 is clamped on the bottom of the control tank 12, the sealing steel ball 4 By blocking the upper flow channel of the throttle sleeve 2, the first throttle hole 13 is indirectly blocked, and the sealing steel ball 4 controls whether the working groove 11 and the control groove 12 are connected or not, and controls the piston rod 3 to approach or stay away from the valve sleeve body 1 . In this embodiment, the sealing steel ball 4 is specifically a steel ball, and the control device is an electromagnet control device commonly used in the field, and its specific structure and working principle will not be repeated here.

Specifically, the side of the throttling sleeve 2 away from the inner counterbore 22 is provided with an outer counterbore 23, the diameter of the second orifice 21 is smaller than the outer counterbore 23, and the other end opening of the second orifice 21 is located at the outer counterbore. Inside the hole 23 , that is, the second throttle hole 21 of the throttle sleeve 2 communicates with the inner counterbore 22 and the outer counterbore 23 .

More specifically, the outer wall of the throttling sleeve 2 is provided with an annular snap groove 24. When the throttling sleeve 2 is fitted on the bottom of the control groove 12 or the working groove 11 with an interference fit, the inner wall of the control groove 12 or the working groove 11 will The deformation snaps into the ring-shaped locking groove 24 . The throttling sleeve 2 is pressed into the valve sleeve body 1 in an interference manner. After being pressed in, the inner wall of the control groove 12 or the working groove 11 is squeezed and deformed. , The throttling sleeve 2 and the valve sleeve body 1 are staggeredly clamped, so that the clamping of the throttle sleeve 2 is more firm.

In this embodiment, the working groove 11 includes a piston main groove 111 and a working groove 112 arranged at the bottom of the piston main groove 111. The diameter of the piston main groove 111 is larger than that of the working groove 112, and one end of the first throttle hole 13 is open. Located in the working slot 112 , the throttling sleeve 2 is snugly fitted in the working slot 112 , and the oil inlet hole 14 is arranged on the side wall of the piston main slot 111 .

Specifically, the control groove 12 includes a sealing cone groove 121 and a control bottom groove 122 arranged at the bottom of the sealing cone groove 121. The aperture of the control bottom groove 122 is larger than the first throttle hole 13, and the other end of the first throttle hole 13 is open. Located in the control bottom groove 122.

More specifically, the sealing taper groove 121, the control bottom groove 122, the first throttle hole 13, the working card groove 112 and the piston main groove 111 connected in sequence on the valve sleeve body 1 are arranged coaxially, and the throttle sleeve 2 is connected in sequence. The outer counterbore 23, the second orifice 21 and the inner counterbore 22 are arranged coaxially.

Embodiment two

As shown in FIGS. 5-7 , this embodiment provides a fuel injection valve sleeve assembly, which differs from Embodiment 1 in that the throttling sleeve 2 is clamped on the bottom of the working tank 11 .

Specifically, the control groove 12 includes a control sinking groove 123 and a control clamping groove 124 arranged at the bottom of the control sinking groove 123. One end opening of the first throttle hole 13 is located in the control clamping groove 124, and the throttling sleeve 2 is interference-fitted. It is in the control card slot 124 and connected with the valve sleeve body 1 by welding.

In this embodiment, after the throttling sleeve 2 is fitted in the control slot 124 with interference, the edge of the outer end surface and the contact point of the valve sleeve body 1 are fixed by welding to ensure the reliability of the throttle sleeve 2. Install to prevent high-pressure fuel from seeping into the bottom of the throttle sleeve 2 and jacking it up.

More specifically, the working groove 11 includes a piston through groove 113 and a working bottom groove 114 arranged at the bottom of the piston through groove 113. The diameter of the working bottom groove 114 is larger than that of the first throttle hole 13. On the side wall of the groove 113 , the other end opening of the first throttling hole 13 is located in the working bottom groove 114 .

In this embodiment, the side of the throttling sleeve 2 away from the inner counterbore 22 is provided with an outer tapered groove 25, the opening at one end of the outer counterbore 23 is set in the outer tapered groove 25, and the other end of the second throttle hole 21 The opening communicates with the outer tapered groove 25 through the outer counterbore 23 . The outer conical groove 25 and the outer counterbore 23 cooperate to facilitate the sealing of the sealing steel ball 4. When the sealing steel ball 4 is pressed against the bottom of the outer conical groove 25 by an external force to block the outer counterbore 23, the first sealing ball 4 is indirectly blocked. Orifice 13.

Specifically, the control sinking groove 123, the control card groove 124, the first throttle hole 13, the working bottom groove 114 and the piston through groove 113 connected in sequence on the valve sleeve body 1 are arranged coaxially, and the outer side of the throttle sleeve 2 connected in sequence The tapered groove 25 , the outer counterbore 23 , the second throttle hole 21 and the inner counterbore 22 are arranged coaxially.

In this embodiment, the throttling sleeve 2 is clamped on the bottom of the working tank 11. On the basis of reducing the risk of cavitation on the sealing cone surface of the valve sleeve when the fuel pressure suddenly drops, due to the outer surface of the throttling sleeve 2 The side is the cavitation risk surface, so that when cavitation defects occur, the throttle sleeve 2 can be replaced separately without replacing the valve sleeve body 1, thereby reducing the cost of maintenance and replacement.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. A fuel injection valve sleeve assembly, characterized in that it comprises: A valve sleeve body (1), the opposite sides of the valve sleeve body (1) are respectively provided with a working groove (11) and a control groove (12), and the working groove (11) and the control groove (12) Connected through the first throttle hole (13), the side wall of the working tank (11) is provided with an oil inlet hole (14) connected to the outside; The throttling sleeve (2) is clamped on the bottom of the working groove (11) or the control groove (12), and the opposite sides of the throttling sleeve (2) are respectively provided with second throttle holes (21) and the inner counterbore (22), one end opening of the second throttle hole (21) is located in the inner counterbore (22), and the inner counterbore (22) communicates with the first throttle Hole (13), the diameter of the first orifice (13) and the second orifice (21) are all smaller than the inner counterbore (22). 2. The fuel injection valve sleeve assembly according to claim 1, characterized in that an outer counterbore (23) is provided on the side of the throttle sleeve (2) away from the inner counterbore (22) , the diameter of the second throttle hole (21) is smaller than that of the outer counterbore (23), and the other end of the second throttle hole (21) is opened in the outer counterbore (23). 3. The fuel injection valve sleeve assembly according to claim 1, characterized in that, the outer wall of the throttling sleeve (2) is provided with an annular slot (24), and the throttling sleeve (2) passes through When Yingka is installed at the bottom of the control groove (12) or the operation groove (11), the inner wall of the control groove (12) or the operation groove (11) deforms and snaps into the annular card groove (24). 4. The fuel injection valve sleeve assembly according to claim 1, characterized in that, the working groove (11) includes a piston main groove (111) and a working groove arranged at the bottom of the piston main groove (111). card slot (112), one end opening of the first throttle hole (13) is located in the work card slot (112), and the throttling sleeve (2) is interference-fitted in the work card slot (112 ), the oil inlet hole (14) is arranged on the side wall of the piston main groove (111). 5. The fuel injection valve sleeve assembly according to claim 4, characterized in that the control groove (12) includes a sealing tapered groove (121) and a control valve arranged at the bottom of the sealing tapered groove (121). A bottom groove (122), the other end opening of the first throttling hole (13) is located in the control bottom groove (122). 6. The fuel injection valve sleeve assembly according to claim 1, characterized in that, the control groove (12) includes a control sink (123) and a control valve arranged at the bottom of the control sink (123). A card slot (124), one end opening of the first throttle hole (13) is located in the control card slot (124), and the throttle sleeve (2) is interference-fitted in the control card slot (124 ), and welded with the valve sleeve body (1). 7. The fuel injection valve sleeve assembly according to claim 6, characterized in that, the working groove (11) includes a piston through groove (113) and a working groove arranged at the bottom of the piston through groove (113). Bottom groove (114), the oil inlet hole (14) is arranged on the side wall of the piston through groove (113), and the other end opening of the first throttle hole (13) is located in the working bottom groove ( 114) inside. 8. The fuel injection valve sleeve assembly according to claim 6, characterized in that, the side of the throttle sleeve (2) facing away from the inner counterbore (22) is provided with an outer tapered groove (25) , the other end opening of the second throttle hole (21) communicates with the outer tapered groove (25). 9. The fuel injection valve sleeve assembly according to any one of claims 1-8, characterized in that it further comprises a piston rod (3), and the piston rod (3) is arranged in the working groove (11) . 10. The fuel injection valve sleeve assembly according to any one of claims 1-8, characterized in that it further comprises a sealing steel ball (4), and the sealing steel ball (4) is arranged in the control groove (12 ), the first orifice (13) can be blocked or opened under the control of the control device.