Gasoline direct injection rail

Abstract

To obtain a gasoline direct injection rail provided with an inlet capable of reducing pressure pulsation without increasing the inner diameter of a high-pressure pipe even when the pressure of a system is increased. A gasoline direct injection rail comprises an inlet 2, 21 at a first end 15, 34 of a rail body 1, 20, wherein an orifice 12, 31 is provided inside the rail body 1, 20, the inlet 2, 21 has a fuel flow passage 4, 23, and a hollow part 8, 27 is provided between the fuel flow passage 4, 23 and the orifice 12, 31.

Claims

1. A gasoline direct injection rail, comprising: a rail body; and an inlet that is provided between the rail body and a high-pressure pump, the inlet being connected to an end of the rail body, wherein the inlet has a fuel flow passage and an insertion part inserted into the rail body, an orifice is provided on a distal end surface of a downstream side of the insertion part, the downstream side being a side farther from the high-pressure pump, an orifice hole having a diameter smaller than a diameter of the fuel flow passage is formed to penetrate a center of the orifice, the orifice hole is provided on a plane, which is on the same plane as the distal end surface of the downstream side of the insertion part, the same plane is vertical to a flowing direction of a fuel, the insertion part of the inlet has a hollow part to increase an inner volume of the fuel flow passage from the high-pressure pump to the orifice, and the hollow part is positioned in the fuel flow passage from the high-pressure pump to the orifice.

2. The gasoline direct injection rail according to claim 1, wherein the orifice is integrally provided in the insertion part of the inlet.

3. The gasoline direct injection rail according to claim 1, wherein the orifice is provided as a component separate from the inlet and the rail body.

4. The gasoline direct injection rail according to claim 1, wherein an engagement step is provided on an inner circumference of the rail body, and the orifice and the orifice hole are provided between the engagement step and an opening of the inlet.

5. The gasoline direct injection rail according to claim 1, wherein a distance between the orifice hole and the end of the surface of the rail body in the flowing direction of the fuel is the same as the distance between the distal end surface of the downstream side of the insertion part and the end surface of the rail body in the flowing direction of the fuel.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a partially enlarged cross-sectional view showing the first embodiment of the present invention.

(2) FIG. 2 is a partially enlarged cross-sectional view of the second embodiment.

(3) FIG. 3 is a partially enlarged cross-sectional view of a conventional example.

MODES FOR CARRYING OUT THE INVENTION

First Embodiment

(4) The first embodiment, which is the first invention of the present application, will now be described below with reference to FIG. 1. First, (1) denotes a rail body, and an inlet (2) that is a component formed separately from the rail body (1) is securely placed at a first end (15) thereof. The inlet (2) is provided with a fuel flow passage (4) on the distal end (3) side, the proximal end (6) side across an outer circumferential flange (5) from the distal end (3) side has a cylindrical shape, and this cylindrical part is an insertion part (7) inserted into the rail body (1). The outer diameter of the insertion part (7) is substantially the same as the inner diameter of the rail body (1).

(5) A hollow part (8) that is in communication with the fuel flow passage (4) is provided inside the insertion part (7), and an opening (10) is provided on the proximal end (6) side. A flat-plate orifice (12) is securely placed on a distal end surface (11) of the insertion part (7) by brazing, and a small-diameter orifice hole (13) is formed to penetrate the center of the orifice (12). Securely placing the orifice (12) on the inlet (2) in this way makes it possible to simultaneously attach the orifice (12) and the inlet (2) during attachment to the rail body (1), and therefore attachment can be facilitated.

(6) In this embodiment, the inlet (2) is integrally provided with the orifice (12) as described above, but other different embodiments are not limited thereto, and it is also possible that the inlet (2) and the orifice (12) are formed as separate components, first the orifice (12) is inserted into and placed in the rail body (1), and then only the inlet (2) is securely placed in the rail body (1) by brazing.

(7) Then, in a state where the insertion part (7) of the inlet (2) formed as described above is inserted into and placed in the rail body (1), and the outer circumferential flange (5) of the inlet (2) is in contact with an end surface (14) of the rail body (1), the inlet (2) is securely placed in the rail body (1) by brazing. Accordingly, the orifice (12) is positioned in the rail body (1), and the hollow part (8) is positioned between the orifice (12) and the fuel flow passage (4) of the inlet (2).

(8) Providing the hollow part (8) between the fuel flow passage (4) and the orifice (12) in this way makes it possible to provide a large inner volume between the orifice (12) and a high-pressure pump (not shown) that is in communication with the inlet (2) through a high-pressure pipe (not shown). It is thus possible to reduce pressure pulsation produced by the high-pressure pump. Accordingly, it is not necessary to increase the inner diameter of the high-pressure pipe, therefore it is also not necessary to utilize a high-strength material, and it is possible to suppress a cost increase.

Second Embodiment

(9) In the first embodiment, the inlet (2) and the orifice (12) are integrally attached to the rail body (1), with the orifice (12) being securely placed on the inlet (2), but in the present embodiment, an inlet (21) and an orifice (31) are separately attached to a rail body (20). As for the second embodiment described below, the inlet (21) formed as a component separate from the rail body (20) is securely placed at a first end (34) of the rail body (20).

(10) The inlet (21) is provided with a fuel flow passage (23) on the distal end (22) side, the proximal end (25) side across an outer circumferential flange (24) from the distal end (22) side has a cylindrical shape, and the cylindrical part is an insertion part (26) inserted into the rail body (20). An outer circumferential thread (37) is provided on the outer circumference of the insertion part (26), and an inner circumferential thread (36) that can be screw-fitted to the outer circumferential thread (37) is formed on the inner circumference on the first end (34) side of the rail body (20).

(11) A hollow part (27) having an opening (28) on the proximal end (25) side is formed in the insertion part (26), and the hollow part (27) is in communication with the fuel flow passage (23). An engagement step (35) is provided on the inner circumference of the rail body (20) more towards the second end side than the inner circumferential thread (36) is, and a flat-plate orifice (31) is provided between the engagement step (35) and the opening (28) of the inlet (21). A small-diameter orifice hole (32) is formed to penetrate the center of the orifice (31).

(12) Here, a method for attaching the inlet (21) and the orifice (31) to the rail body (20) will now be described. First, the orifice (31) is inserted into and placed in a portion of the rail body (20) where the orifice (31) is brought into contact with the engagement step (35) of the rail body (20). In this state, while screw-fitting the outer circumferential thread (37) of the insertion part (26) of the inlet (21) to the inner circumferential thread (36) of the rail body (20), the insertion part (26) of the inlet (21) is inserted into the rail body (20).

(13) At the same time when the distal end surface (30) of the insertion part (26) is brought into contact with the surface of the orifice (31), the outer circumferential flange (24) of the inlet (21) is brought into contact with the end surface (33) of the rail body (20), and thereby attachment of the inlet (21) to the rail body (20) is completed. Attaching the inlet (21) and the orifice (31) to the rail body (20) as described above causes the orifice (31) to be positioned in the rail body (20) and the hollow part (27) to be positioned between the orifice (31) and the fuel flow passage (23) of the inlet (21).

(14) Providing the hollow part (27) between the fuel flow passage (23) and the orifice (31) in this way makes it possible to increase the inner volume between the orifice (31) and a high-pressure pump (not shown) that is in communication with the inlet (21) through a high-pressure pipe (not shown). It is thus possible to reduce pressure pulsation produced by the high-pressure pump. Accordingly, it is not necessary to increase the inner diameter of the high-pressure pipe, therefore it is also not necessary to utilize a high-strength material, and it is possible to suppress a cost increase.

(15) Moreover, as described above, securing the inlet (21) and the rail body (20) by screwing without requiring brazing facilitates connecting the inlet (21) and the rail body (20) such that they are unlikely separated, and also enables the orifice (31) to be rigidly and securely placed in the rail body (20) via the inlet (21).

DESCRIPTION OF THE REFERENCE NUMERALS

(16) 1, 20 Rail body 2, 21 Inlet 3, 22 Distal end 4, 23 Fuel flow passage 6, 25 Proximal end 7, 26 Insertion part 8, 27 Hollow part 12, 31 Orifice 15, 34 First end