WO2014107825A1

WO2014107825A1 - Inlet/outlet fuel valves of common rail pump

Info

Publication number: WO2014107825A1
Application number: PCT/CN2013/001117
Authority: WO
Inventors: 肖亨琳; 王永东
Original assignee: 无锡开普机械有限公司
Priority date: 2013-01-10
Filing date: 2013-09-22
Publication date: 2014-07-17
Also published as: CN103061936A; CN103061936B

Abstract

An inline high-pressure common rail pump comprising inlet/outlet fuel valves. A plunger is arranged in a plunger hole at an end part of a plunger-matching piece. A third fuel chamber is provided on the upper end of the plunger hole. A valve body and a fuel outlet connector are sequentially arranged within a cavity of the plunger-matching piece. A fuel inlet valve spring base is arranged at the end part of the plunger-matching piece in the fuel-pressing direction. The upper end of the fuel inlet valve spring base is extended into a first fuel chamber. A fuel inlet valve spring is sleeved on the fuel inlet valve spring base. The upper end of the fuel inlet valve spring is abutted against a fuel inlet valve steel ball. The upper end of the fuel inlet valve steel ball is abutted against a first fuel passage of the valve body. A seventh fuel passage transversely provided on the valve body is in communication with the first fuel passage. A second fuel passage and a third fuel passage that are in communication with each other are also provided in the valve body. The high-pressure common rail pump is structurally simple, inventive, and reasonable, has a reduced number of parts, is structurally compact, and reduces processing difficulty, while at the same time the sealing performance is greatly increased for the inlet/outlet fuel valves.

Description

Common rail pump inlet and outlet valve

Technical field

The invention relates to the technical field of in-line high pressure common rail pumps, in particular to an inlet and outlet oil valve of a common rail pump.

Background technique

Compared with the traditional mechanical fuel system, the electronically controlled high pressure common rail fuel injection system has significant advantages such as reducing engine noise, reducing emissions, and improving fuel economy. Therefore, the electronically controlled high pressure common rail fuel injection system has been widely used in developed countries. application. In China, with the continuous improvement of people's awareness of environmental protection and related environmental protection laws and regulations, electronically controlled high-pressure common rail fuel injection systems with excellent environmental performance have become an inevitable choice.

The common rail pump is an important component of this environmentally friendly fuel injection system. It can realize the ideal control of the common rail pressure. In order to meet the fast and efficient control of the common rail pressure, the common rail pump must have a good high pressure seal. Sex, high pumping efficiency, good heat dissipation. For this reason, it is particularly urgent to develop an inlet and outlet oil valve that satisfies the requirements of the common rail pump. At present, the inlet and outlet oil valves of the common rail pump in the prior art are mostly in a separate design form. This design form increases the number of parts entering and leaving the oil valve and leads to a large number of sealing faces, and the high-pressure sealing property is also unsatisfactory, which makes the structure complicated and at the same time This design method also requires high processing accuracy and increases production costs.

Summary of the invention

The object of the present invention is to overcome the deficiencies in the prior art, and to provide a simple, ingenious and reasonable common rail pump inlet and outlet valve, the inlet and outlet valve parts are small in number and compact in structure, and the inlet and outlet oil valve sealing performance it is good.

According to the technical solution provided by the present invention, a common rail pump inlet and outlet valve is characterized in that: a plunger is installed in a plunger hole at an end of the plunger coupler, and a third oil chamber is disposed at an upper end of the plunger hole, the valve body The oil outlet joint is sequentially installed in the plunger coupler cavity, and the oil inlet valve spring seat is installed at the end of the plunger coupler oil pressure direction, and the upper end of the oil inlet valve spring seat extends into the first oil chamber, and the oil is introduced. The valve spring is set on the inlet valve spring seat, the upper end of the oil inlet valve spring is placed on the oil inlet valve steel ball, and the upper end of the oil inlet wide steel ball is placed on the first oil passage of the wide body, and is horizontally disposed on the valve body. The seventh oil passage is connected to the first oil passage, and the second oil passage and the third oil passage are connected to each other in the valve body; the spring valve spring seat is disposed in the middle hole of the oil outlet joint, and is arranged around the lower end of the oil outlet spring seat A second oil chamber is arranged on the oil joint, and the oil outlet valve spring is set on the spring valve spring seat, and the two ends of the oil outlet valve steel ball are respectively arranged on the oil outlet valve spring and the third oil passage of the valve body, and the outlet A fourth oil passage is disposed on the oil joint, and a fifth oil passage, a sixth oil passage, and a ring shape are further disposed on the plunger coupler as a further improvement of the present invention, wherein the first oil passage end surface is provided with an oil inlet valve The first tapered surface of the steel ball.

As a further improvement of the present invention, the upper end surface of the valve body is provided with a second tapered surface that is in contact with the oil discharge valve steel ball.

As a further improvement of the present invention, the fourth oil passage is coaxial with the plunger hole of the plunger coupler and communicates with the second oil chamber.

As a further improvement of the present invention, the fifth oil passage is disposed at a lower end of the plunger coupler cavity and communicates with the cavity of the plunger coupler.

As a further improvement of the present invention, the sixth oil passage is constituted by the outer wall of the valve body and the inner wall of the plunger coupler chamber.

As a further improvement of the present invention, the annular oil groove is constituted by the outer edge of the upper end portion of the valve body and the inner wall of the plunger coupler chamber.

As a further improvement of the present invention, the second oil passage is parallel to the first oil passage, and the third oil passage is obliquely disposed at the upper end portion of the valve body.

As a further improvement of the present invention, a seal ring is provided at the junction of the oil outlet joint and the plunger coupler. As a further improvement of the present invention, the angle of the axis of the third oil passage to the axis of the valve body is α greater than 15 ° and less than 50 °.

Compared with the prior art, the invention has the advantages that: the invention has the advantages of simple structure, ingenious and reasonable structure, small number of parts, compact structure, reduced processing difficulty, and at the same time, the sealing performance of the inlet and outlet oil valve is greatly improved.

DRAWINGS

Figure 1 is a schematic view of the structure of the present invention.

Figure 2 is a schematic view of the valve body 10.

Figure 3 is a schematic view showing the structure of the present invention mounted on a common rail pump.

detailed description

The invention will now be further described with reference to the specific drawings and embodiments.

As shown in Fig. 1, Fig. 2 and Fig. 3, including side cover bearing 1, side cover 2, 0 type ring 3, pump body 4, tappet body 5, plunger coupler 6, inlet valve spring seat 7, advance Oil valve spring 8, oil inlet valve ball 9, valve body 10, oil outlet valve ball 11, oil outlet joint 12, oil outlet valve spring seat 13, oil outlet valve spring 14, pressure regulating valve 15, oil inlet metering valve 16. Oil pump 17, rear adjusting washer 18, camshaft 19, adjusting washer 20. The plunger 21, the return oil groove 22, the return oil passage 23, the seal ring 24, the third oil chamber 25, the fifth oil passage 26, the sixth oil passage 27, the second oil passage 28, and the second oil chamber 29 The fourth oil passage 30, the seventh oil passage 31, the first oil passage 32, the first oil chamber 33, the eighth oil passage 34, the annular belt 35, the annular oil groove 36, the third oil passage 37, and the second tapered surface 38 , the first tapered surface 39 and the like.

As shown in FIG. 1, FIG. 2 and FIG. 3, the present invention is an inlet and outlet oil valve of a common rail pump, and the inlet and outlet oil valve is characterized in that a plunger 21 is installed in a plunger hole at an end portion of the plunger coupler 6, The third oil chamber 25 is disposed at the upper end of the plunger hole, the valve body 10 and the oil outlet joint 12 are sequentially installed in the cavity of the plunger coupler 6, and the oil inlet spring seat 7 is installed at the end of the plunger coupler 6 in the oil pressure direction. The upper end of the oil inlet valve spring seat 7 extends into the first oil chamber 33, and the oil inlet valve spring 8 is fitted on the oil inlet spring seat 7, and the upper end of the oil inlet valve spring 8 is placed on the oil inlet valve ball 9 The upper end of the inlet valve steel ball 9 is placed on the first oil passage 32 of the valve body 10, and the seventh oil passage 31 disposed transversely on the valve body 10 communicates with the first oil passage 32, and the valve body 10 is also provided with mutual communication. The second oil passage 28 and the third oil passage 37; the oil outlet spring seat 13 is disposed in the middle hole of the oil outlet joint 12, and the second oil chamber 29 is disposed on the oil outlet joint 12 around the lower end of the oil outlet spring seat 13 The oil valve spring 14 is set on the oil discharge valve spring seat 13, and the two ends of the oil discharge valve steel ball 11 are respectively arranged on the oil discharge valve spring 14 and the third oil passage of the valve body 10. The oil is provided on the fitting 12 of the fourth oil passage 30, the plunger coupling member 26 is also provided on a fifth oil passage 6, the sixth oil passage 27, the annular oil groove 36.

A first tapered surface 39 that is in contact with the inlet valve steel ball 9 is disposed at an end surface of the first oil passage 32. A second tapered surface 38 that is in contact with the oil discharge valve ball 11 is disposed at the upper end surface of the valve body 10. The fourth oil passage 30 is coaxial with the plunger hole of the plunger coupler 6, and communicates with the second oil chamber 29. The fifth oil passage 26 is disposed at the lower end of the cavity of the plunger coupler 6 and communicates with the cavity of the plunger coupler.

The sixth oil passage 27 is constituted by the outer wall of the valve body 10 and the inner wall of the plunger member 6.

The annular oil groove 36 is formed by the outer edge of the upper end portion of the valve body 10 and the inner wall of the plunger member 6. The second oil passage 28 is parallel to the first oil passage 32, and the third oil passage 37 is disposed obliquely at the upper end portion of the valve body 10.

A seal ring 24 is provided at the junction of the oil discharge joint 12 and the plunger coupler 6.

The angle between the axis of the third oil passage 37 and the axis of the valve body 10 is α greater than 15 ° and less than 50 °

As shown in FIG. 3, the present invention is mounted on a common rail pump. The camshaft 19 is mounted in the pump body 4 by bearing support at both ends, and the outer ring of the side cover bearing 1 is mounted in the middle hole of the side cover 2, and the camshaft 19 is The bearing outer ring of the connecting end of the oil pump 17 is installed in the middle hole of the pump body 4. The cam shaft 19 drives the oil pump 17 to rotate through the swash plate, and the tappet body 5 is installed in the vertical hole of the pump body 4, and is ensured by the guide screw. Cylinder The axial direction of the roller 5 is parallel to the axial direction of the camshaft 19, and the plunger coupler 6 and the tappet body 5 are mounted on the same hole in the pump body 4, and the plunger coupler 6 is above the tappet body 5 to feed in and out of the oil. The valve is mounted in the central bore of the plunger coupler 6 and is compressed by the oil outlet fitting 12.

As shown in Fig. 1 and Fig. 3, the fuel enters the oil pump 17 from the fuel tank, and a certain oil pressure is established under the driving of the camshaft 19. The oil pressure entering the oil inlet metering valve 16 is stabilized by the adjustment of the pressure regulating valve 15. The opening time of the inlet metering valve 16 is controlled as needed to control the amount of oil entering the inlet valve. The fuel passes through the fifth oil passage 26 and the sixth oil passage 27 to reach the annular oil groove 36, and reaches the first through the seventh oil passage 31. The oil passage 32 moves under the action of the oil pressure into the oil valve spring seat 7 in the direction of the oil inlet valve spring seat 7, the oil inlet valve is opened, and the fuel enters the third oil chamber 25 when the plunger 21 is under the action of the cam shaft 19. , pushing the tappet body 5 (both rolling friction), when the tappet body 5 pushes the plunger 21 to move toward the oil inlet spring seat 7, the volume of the third oil chamber 25 is reduced, and the fuel therein is compressed to enter the first The second oil chamber 33, under the action of the pressure of the compressed fuel, the oil inlet valve 9 is fitted to the first tapered surface 39 of the valve body 10, the compressed fuel is prevented from entering the oil inlet passage, and the compressed fuel is passed. Second oil passage 28 and third oil passage 37 Opening the oil valve steel ball 11 into the second oil chamber 29, the second oil chamber 29 has the effect of slowing the oil pressure fluctuation, and finally flows out of the oil pump through the fourth oil passage 30; when the cam shaft 19 rotates in the direction of decreasing the lift, When the plunger 21 moves away from the inlet valve spring seat 7 under the action of the spring force, the oil pressure in the first oil chamber 33 rapidly decreases, and the oil pressure in the second oil chamber 29 does not change, and the oil outlet valve ball 11 is adhered to the second tapered surface 38 of the valve body 10 under the action of the oil pressure, and the oil outlet is closed to prevent the pressurized fuel from flowing back. The movement of the plunger 21 causes the volume of the third oil chamber 25 to become larger, due to the The oil pressure in the oil chamber 33 is rapidly lowered, and the oil inlet wide steel ball 9 is pushed open by the oil pressure of the oil inlet passage, and the fuel is filled with the first oil chamber 33 and the third oil chamber 25, so that the plunger 21 is in the cam shaft and the spring. Under the action of the reciprocating movement up and down, the inlet and outlet oil valves repeat the above actions.

The invention adopts the cooperation of the steel ball and the cone surface to control the opening and closing of the inlet and outlet oil valve, and the actual production application can also change the steel ball into a cone sliding table, and the above-mentioned oil inlet and outlet can be realized by the cooperation of the cone sliding table and the tapered surface. The opening and closing action of the valve.

The invention has the advantages of simple structure, ingenious and reasonable structure, small number of parts and compact structure, which reduces the processing difficulty, and at the same time, the sealing performance of the inlet and outlet oil valve is greatly improved.

Claims

1. A common rail pump inlet and outlet valve, characterized in that a plunger (21) is installed in a plunger hole at an end of a plunger coupler (6), and a third oil chamber (25) is arranged at an upper end of the plunger hole The valve body (10) and the oil outlet joint (12) are sequentially installed in the cavity of the plunger coupler (6), and the inlet valve spring seat (7) is installed at the end of the plunger coupler (6) in the oil pressure direction. The upper end of the inlet valve spring seat (7) extends into the first oil chamber (33), and the inlet valve spring (8) is fitted on the inlet valve spring seat (7), the inlet valve spring (8) The upper end is on the inlet valve ball (9), the upper end of the inlet wide steel ball (9) is placed on the first oil passage (32) of the valve body (10), and is disposed laterally on the valve body (10). The seventh oil passage (31) is connected to the first oil passage (32), and the second oil passage (28) and the third oil passage (37) are connected in the valve body (10); the oil outlet spring seat (13) Set in the middle hole of the oil outlet joint (12), a second oil chamber (29) is arranged on the oil outlet joint (12) around the lower end of the oil outlet spring seat (13), and the oil outlet valve spring (14) is set in the oil outlet. Valve spring seat (13), oil outlet valve ball (11) The two ends are respectively arranged on the third oil passage of the oil discharge valve spring (14) and the valve body (10), and the oil outlet joint (12) is provided with a fourth oil passage (30), and the plunger coupling member (6) A fifth oil passage (26), a sixth oil passage (27), and an annular oil groove (36) are also disposed.

2. The inlet and outlet valve of a common rail pump according to claim 1, wherein: the first oil passage (32) is provided with a first cone at the end face of the oil passage valve (9) Face (39).

The inlet and outlet valve of the common rail pump according to claim 1, wherein the upper end surface of the valve body (10) is provided with a second tapered surface which is matched with the oil discharge valve steel ball (11). (38).

4. The inlet and outlet oil valve of a common rail pump according to claim 1, wherein: said fourth oil passage (30) is coaxial with a plunger hole of said plunger (6), and is connected to the second Oil chamber (29).

5. The inlet and outlet oil valve of a common rail pump according to claim 1, wherein: said fifth oil passage

(26) Set at the lower end of the plunger (6) cavity and connect the cavity of the plunger coupler.

6. The inlet and outlet oil valve of a common rail pump according to claim 1, wherein: said sixth oil passage

(27) It consists of the outer wall of the valve body (10) and the inner wall of the plunger (6).

The inlet and outlet oil valve of a common rail pump according to claim 1, wherein: said annular oil groove (36) is constituted by an outer edge of an upper end portion of the valve body (10) and an inner wall of the plunger member (6). .

8. The inlet and outlet oil of a common rail pump according to claim 1, wherein: said second oil passage

(28) Parallel to the first oil passage (32), the third oil passage (37) is obliquely disposed at the upper end portion of the valve body (10).

9. The inlet and outlet oil valve of a common rail pump according to claim 1, wherein: said oil outlet joint (12) Set the seal (24) at the junction with the plunger (6).

10. The inlet and outlet oil valve of a common rail pump according to claim 1, wherein: an angle between an axis of the third oil passage (37) and an axis of the valve body (10) is greater than 15°, and is less than 50 ° .