Pump cover of a high-pressure oil supply pump

Abstract

The present invention provides a pump cover for a high-pressure fuel supply pump, characterized in that it includes a cover body, the cover body being provided with a low-pressure fuel inlet passage, a high-pressure fuel outlet passage, and multiple fuel pump pairs, the fuel inlet ends of the multiple fuel pump pairs being connected to the low-pressure fuel inlet passage, and the fuel outlet ends of the multiple fuel pump pairs being connected to the high-pressure fuel outlet passage; the fuel pump pairs including a fuel supply portion and a plunger portion, the fuel supply portion being axially arranged parallel to the bottom surface of the cover body, the plunger portion extending axially downward from the cover body, and the plunger portion being axially arranged perpendicular to the bottom surface of the cover body. Using the pump cover of the present invention, the high-pressure fuel supply pump is less prone to fuel leakage, is reliable in use, has a compact structure, occupies little space, and is easy to install.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle manufacturing, in particular to a pump cover of a high-pressure oil supply pump. Background Art

[0002] In the common rail fuel injection system, the function of the common rail pump is to quantitatively output high-pressure fuel sufficient for engine combustion to the common rail pipe. The core component for generating high-pressure fuel is the pump system. The low-pressure fuel enters the oil pressure chamber through the oil inlet valve in the pump system, and the movement of the plunger generates high-pressure fuel, which is then pumped out through the oil outlet valve. Figure 1 As shown, in the prior art, the oil pump system of the fuel supply pump is usually placed in a suspended manner in the pump body, and the inlet and outlet oil valves are tightly placed at the upper end of the plunger pair. The oil pump system is spatially distributed in an axial integral manner. Finally, the pump cover is installed and connected to the pump body by the pump cover bolts to realize the installation of the oil pump system. However, the above structure easily causes high-pressure fuel to leak from the joint surface between the pump cover and the pump body, affecting the pressure and flow of the fuel pumped out. On the other hand, in order to improve the sealing of the joint surface, the prior art often increases the pre-tightening force of the connecting bolts between the pump cover and the pump body, thereby reducing the service life of the connecting bolts and reducing the overall reliability and life of the high-pressure fuel supply pump. In addition, the axial arrangement of the above-mentioned oil pump system makes the height dimension of the entire fuel supply pump larger, occupying a larger vehicle layout space. Under the increasingly limited vehicle layout space, it is completely unfavorable for the compact layout and lightweight design of the vehicle. Moreover, the above-mentioned structure is complex and inconvenient to install. Summary of the Invention

[0003] In response to the problems of the background technology, the present invention provides a pump cover for a high-pressure fuel supply pump to solve the problems of the prior art high-pressure fuel supply pump such as easy fuel leakage, unreliable use, non-compact structure, large space occupation and complex installation.

[0004] To achieve the purpose of the present invention, the present invention provides a pump cover for a high-pressure oil supply pump, the innovation of which is that it comprises a cover body, wherein a low-pressure oil inlet passage, a high-pressure oil outlet passage and a plurality of oil pump pairs are provided in the cover body, the oil inlet ends of the plurality of oil pump pairs are all connected to the low-pressure oil inlet passage, and the oil outlet ends of the plurality of oil pump pairs are all connected to the high-pressure oil outlet passage; the oil pump pair comprises an oil supply part and a plunger part, the axial direction of the oil supply part is arranged parallel to the bottom surface of the cover body, the axial direction of the plunger part extends toward the bottom of the cover body, and the axial direction of the plunger part is arranged perpendicular to the bottom surface of the cover body.

[0005] As an optimization, the axial directions of the plurality of oil supply portions are arranged parallel to each other, and the axial direction of the low-pressure oil inlet passage is arranged parallel to the axial direction of the high-pressure oil outlet passage.

[0006] As an optimization, the oil supply part includes an oil inlet chamber, an oil pressure chamber, a high-pressure oil chamber and an oil outlet chamber connected in sequence from left to right; the left end of the oil inlet chamber is connected to the low-pressure oil inlet channel, the right end of the oil inlet chamber is provided with an oil inlet valve tight seat, the right end of the oil pressure chamber is provided with an oil outlet valve tight seat, the right end of the high-pressure oil chamber is provided with an oil outlet tight seat, and the centers of the oil inlet valve tight seat, the oil outlet valve tight seat and the oil outlet tight seat are all axially provided with oil holes; an oil inlet slide valve is also provided in the oil pressure chamber, and a right end face of the oil inlet slide valve and a left end face of the oil outlet valve tight seat are passed through The first compression spring is connected, and under the action of the restoring force of the first compression spring, the left end face of the oil inlet slide valve can contact the right end face of the oil inlet valve seat to close the right end outlet of the oil through hole of the oil inlet valve seat; an oil outlet slide valve is also provided in the high-pressure oil chamber, and the right end face of the oil outlet slide valve and the left end face of the oil outlet seat are connected by a second compression spring. Under the action of the restoring force of the second compression spring, the left end face of the oil outlet slide valve can contact the right end face of the oil outlet valve seat to close the right end outlet of the oil through hole of the oil outlet valve seat; the right end of the oil outlet chamber is connected to the high-pressure oil outlet passage;

[0007] The plunger part includes a plunger cavity, the upper end of the plunger cavity is connected to the oil pressure cavity, and the axial direction of the plunger cavity is perpendicular to the axial direction of the oil pressure cavity; a plunger is arranged in the plunger cavity, the lower end of the plunger extends out of the plunger cavity, and a spring seat is arranged at the lower end of the plunger. A third compression spring is mounted on the plunger, the upper end of the third compression spring is connected to the cavity shell of the plunger cavity, and the lower end of the third compression spring is connected to the spring seat.

[0008] As an optimization, a plurality of first oil grooves are evenly distributed along the circumferential direction on the outer circumferential surface of the oil inlet slide valve, and the axial direction of the first oil grooves is set along the axial direction of the oil inlet slide valve; a plurality of second oil grooves are evenly distributed along the circumferential direction on the outer circumferential surface of the oil outlet slide valve, and the axial direction of the second oil grooves is set along the axial direction of the oil outlet slide valve.

[0009] The method of the present invention has the following beneficial effects: since the entire oil pump pair is integrated into the pump cover, the joint surface between the pump cover and the pump body is no longer in contact with the high-pressure fuel, and the high-pressure fuel will not leak from the joint surface between the pump cover and the pump body, thereby ensuring the reliability of the fuel pump pressure and flow. On the other hand, it can also reduce the pre-tightening force of the connecting bolts between the pump cover and the pump body, thereby increasing the service life of the connecting bolts and the overall service life of the fuel supply pump. In addition, integrating the entire oil pump pair into the pump cover is easier to install and improves production efficiency; arranging the oil supply part horizontally and the plunger part vertically so that the entire oil pump pair is arranged in a T-shape also greatly reduces the height dimension of the entire fuel supply pump, making the structure more compact, more conducive to saving installation space, reducing weight, and more conducive to the lightweight design of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings of the present invention are described below.

[0011] Attachment Figure 1 It is a structural diagram of the oil supply pump in the prior art;

[0012] Attachment Figure 2 It is a structural schematic diagram of the present invention;

[0013] Attachment Figure 3 For attachment Figure 2 sectional view of

[0014] Attachment Figure 4 Schematic diagram of the structure of the cover;

[0015] Attachment Figure 5 Schematic diagram of the structure of the oil inlet slide valve;

[0016] Attachment Figure 6 It is a structural diagram of the oil outlet sliding valve;

[0017] Attachment Figure 7 The figure is a schematic diagram of the installation structure of the present invention on a high-pressure oil supply pump.

[0018] In the figure: 1. cover body; 2. low-pressure oil inlet passage; 3. high-pressure oil outlet passage; 4. oil supply part; 5. plunger part; 41. oil inlet chamber; 42. pressure oil chamber; 43. high-pressure oil chamber; 44. oil outlet chamber; 45. oil inlet valve seat; 46. oil outlet valve seat; 47. oil outlet seat; 48. oil inlet sliding valve; 49. oil outlet sliding valve; 51. plunger chamber; 52. plunger; 53. spring seat; 54. third compression spring; 401. first compression spring; 402. second compression spring; 481. first oil trough; 491. second oil trough. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the embodiments.

[0020] As attached Figure 2 To the attached Figure 4 The pump cover of the high-pressure oil supply pump shown includes a cover body 1, in which a low-pressure oil inlet channel 2, a high-pressure oil outlet channel 3 and a plurality of pump oil pairs are arranged, and the oil inlet ends of the plurality of pump oil pairs are connected to the low-pressure oil inlet channel 2, and the oil outlet ends of the plurality of pump oil pairs are connected to the high-pressure oil outlet channel 3; the oil pump pair includes an oil supply part 4 and a plunger part 5, the axial direction of the oil supply part 4 is arranged parallel to the bottom surface of the cover body 1, and the axial direction of the plunger part 5 extends toward the bottom of the cover body 1, and the axial direction of the plunger part 5 is arranged perpendicular to the bottom surface of the cover body 1.

[0021] In order to facilitate arrangement and make the structure more compact, the axial directions of the plurality of oil supply portions 4 are arranged parallel to each other, and the axial direction of the low-pressure oil inlet passage 2 is arranged parallel to the axial direction of the high-pressure oil outlet passage 3 .

[0022] As attached Figure 3As shown, in order to improve the oil pumping efficiency and ensure the oil pumping reliability, the oil supply part 4 includes an oil inlet chamber 41, an oil pressure chamber 42, a high-pressure oil chamber 43 and an oil outlet chamber 44 connected in sequence from left to right; the left end of the oil inlet chamber 41 is connected to the low-pressure oil inlet passage 2, the right end of the oil inlet chamber 41 is provided with an oil inlet valve seat 45, the right end of the oil pressure chamber 42 is provided with an oil outlet valve seat 46, and the right end of the high-pressure oil chamber 43 is provided with an oil outlet seat 47. The centers of the oil inlet valve seat 45, the oil outlet valve seat 46 and the oil outlet seat 47 are all provided with oil holes in the axial direction; an oil inlet slide valve 48 is also provided in the oil pressure chamber 42, and the right end face of the oil inlet slide valve 48 is connected to the oil outlet valve seat 4 6 is connected by a first compression spring 401. Under the restoring force of the first compression spring 401, the left end face of the oil inlet slide valve 48 can contact the right end face of the oil inlet valve seat 45 to close the right end outlet of the oil hole of the oil inlet valve seat 45; an oil outlet slide valve 49 is also provided in the high-pressure oil chamber 43. The right end face of the oil outlet slide valve 49 is connected to the left end face of the oil outlet seat 47 by a second compression spring 402. Under the restoring force of the second compression spring 402, the left end face of the oil outlet slide valve 49 can contact the right end face of the oil outlet valve seat 46 to close the right end outlet of the oil hole of the oil outlet valve seat 46; the right end of the oil outlet chamber 44 is connected to the high-pressure oil outlet passage 3;

[0023] The plunger portion 5 includes a plunger cavity 51, the upper end of the plunger cavity 51 is connected to the oil pressure cavity 42, and the axial direction of the plunger cavity 51 is perpendicular to the axial direction of the oil pressure cavity 42; a plunger 52 is provided in the plunger cavity 51, the lower end of the plunger 52 extends out of the plunger cavity 51, and a spring seat 53 is provided at the lower end of the plunger 52, and a third compression spring 54 is sleeved on the plunger 52, the upper end of the third compression spring 54 is connected to the cavity shell of the plunger cavity 51, and the lower end of the third compression spring 54 is connected to the spring seat 53.

[0024] In order to increase the oil flow rate of the oil inlet slide valve 48 and the oil outlet slide valve 50, as shown in the attached Figure 5 The outer circumferential surface of the oil inlet slide valve 48 shown in the figure has a plurality of first oil passage grooves 481 evenly distributed in the circumferential direction, and the axial direction of the first oil passage grooves 481 is set along the axial direction of the oil inlet slide valve 48; the outer circumferential surface of the oil outlet slide valve 49 has a plurality of second oil passage grooves 491 evenly distributed in the circumferential direction, and the axial direction of the second oil passage grooves 491 is set along the axial direction of the oil outlet slide valve 49.

[0025] As attached Figure 7 The overall installation diagram of the high-pressure fuel supply pump shown in the figure shows that when in use, the rotation of the camshaft drives the plunger to move up and down, which can suck the fuel from the low-pressure oil channel, and after being pressurized by the fuel supply part, it is pumped out from the high-pressure oil outlet channel.

Claims

1. A pump cover for a high-pressure fuel pump, characterized in that: The invention comprises a cover body (1), wherein a low-pressure oil inlet passage (2), a high-pressure oil outlet passage (3) and a plurality of oil pump pairs are arranged in the cover body (1), the oil inlet ends of the plurality of oil pump pairs are connected to the low-pressure oil inlet passage (2), and the oil outlet ends of the plurality of oil pump pairs are connected to the high-pressure oil outlet passage (3); the oil pump pair comprises an oil supply portion (4) and a plunger portion (5), the axial direction of the oil supply portion (4) is arranged parallel to the bottom surface of the cover body (1), the axial direction of the plunger portion (5) extends toward the bottom of the cover body (1), and the axial direction of the plunger portion (5) is arranged perpendicular to the bottom surface of the cover body (1); the oil supply portion (4) comprises an oil inlet chamber (41), an oil pressure chamber (42), a high-pressure oil chamber ( 43) and an oil outlet chamber (44); the left end of the oil inlet chamber (41) is communicated with the low-pressure oil inlet passage (2); the right end of the oil inlet chamber (41) is provided with an oil inlet valve seat (45); the right end of the pressure oil chamber (42) is provided with an oil outlet valve seat (46); the right end of the high-pressure oil chamber (43) is provided with an oil outlet seat (47); the centers of the oil inlet valve seat (45), the oil outlet valve seat (46) and the oil outlet seat (47) are all provided with oil holes along the axial direction; an oil inlet slide valve (48) is also provided in the pressure oil chamber (42); the right end face of the oil inlet slide valve (48) is connected to the left end face of the oil outlet valve seat (46) by a first compression spring (401). Then, under the action of the restoring force of the first compression spring (401), the left end face of the oil inlet slide valve (48) can contact the right end face of the oil inlet valve seat (45) to close the right end outlet of the oil hole of the oil inlet valve seat (45); an oil outlet slide valve (49) is also provided in the high-pressure oil chamber (43), and the right end face of the oil outlet slide valve (49) is connected to the left end face of the oil outlet seat (47) through the second compression spring (402). Under the action of the restoring force of the second compression spring (402), the left end face of the oil outlet slide valve (49) can contact the right end face of the oil outlet valve seat (46) to close the right end outlet of the oil hole of the oil outlet valve seat (46); the right end face of the oil outlet chamber (44) The end is communicated with the high-pressure oil outlet channel (3); the plunger portion (5) includes a plunger cavity (51), the upper end of the plunger cavity (51) is communicated with the oil pressure cavity (42), and the axial direction of the plunger cavity (51) is perpendicular to the axial direction of the oil pressure cavity (42); a plunger (52) is provided in the plunger cavity (51), the lower end of the plunger (52) extends out of the plunger cavity (51), and a spring seat (53) is provided at the lower end of the plunger (52), and a third compression spring (54) is sleeved on the plunger (52), the upper end of the third compression spring (54) is connected to the cavity shell of the plunger cavity (51), and the lower end of the third compression spring (54) is connected to the spring seat (53).

2. The pump cover of the high-pressure fuel supply pump according to claim 1, characterized in that: The axial directions of the plurality of oil supply parts (4) are arranged parallel to each other, and the axial direction of the low-pressure oil inlet passage (2) is arranged parallel to the axial direction of the high-pressure oil outlet passage (3).

3. The pump cover of the high-pressure fuel supply pump according to claim 1 or 2, characterized in that: A plurality of first oil passage grooves (481) are uniformly distributed along the circumferential direction on the outer circumferential surface of the oil inlet slide valve (48), and the axial direction of the first oil passage grooves (481) is arranged along the axial direction of the oil inlet slide valve (48); a plurality of second oil passage grooves (491) are uniformly distributed along the circumferential direction on the outer circumferential surface of the oil outlet slide valve (49), and the axial direction of the second oil passage grooves (491) is arranged along the axial direction of the oil outlet slide valve (49).

Images