JP6724799B2 - Housing and high-pressure pump including the same - Google Patents

Description

The present invention relates to a housing and a high pressure pump including the housing.

2. Description of the Related Art Conventionally, there is known a housing that forms a tubular portion having a fluid circulation space inside and that is used for, for example, a high-pressure pump. The housing disclosed in Patent Document 1 is used for a high-pressure pump, and is thinned by being configured from a member different from the member forming the pressurizing chamber. The thickness of the tubular portion of the housing is constant in the circumferential direction, and the cross-sectional shape of the outer wall surface of the tubular portion is polygonal. The central portion of the outer wall surface of the tubular portion has a recessed portion to increase rigidity.

JP, 2016-35268, A

In Patent Document 1, in the resonance mode in which the center of the outer wall surface of the cylindrical portion of the housing is a belly and the corner is a node, resonance is achieved by providing a recess in the center of the belly to increase rigidity. The frequencies are shifted to suppress resonance. However, it was found that even if the recess is provided in the center of the antinode, the resonance frequency shift is relatively small and the effect of suppressing resonance is low.
The present invention has been made in view of the above points, and an object thereof is to provide a housing capable of effectively suppressing resonance and a high-pressure pump including the same.

The housing according to the present invention forms a tubular portion (41, 81, 91) having a fluid circulation space (46) therein, and a polygonal portion of the tubular portion in which the solenoid valve mounting hole (43) is formed. The outer wall surface (54) of (52, 82, 92) has a polygonal cross section. A portion of the polygonal portion corresponding to a corner of the outer wall surface is defined as an outer wall corner portion (57, 83, 93), and a portion of the polygonal portion corresponding to a surface center portion of the outer wall surface is designated as an outer wall central portion (58, 84, 94), the radial thickness (t1) of the corner portion of the outer wall is larger than the radial thickness (t2) of the central portion of the outer wall surface at the axial position coinciding with the mounting hole .

With this configuration, the rigidity of the corner portion of the outer wall, which is the node of resonance, is increased, and the mass of the central portion of the outer wall surface, which is the antinode of resonance, is reduced. As a result, the resonance frequency of the cylindrical portion of the housing can be shifted to the high frequency side relatively large and can be moved outside the audible range. Therefore, resonance can be effectively suppressed.

The high-pressure pump according to the present invention comprises, in addition to the above housing, a fixing member (11), a plunger (30), a passage member (35), a fluid inflow portion (60), and a fluid outflow portion (70). ing. The fixing member is reciprocally movable in the axial direction and forms a pressurizing chamber (24). The plunger has a suction passage (37) and a discharge passage (38) communicating with the pressurizing chamber. The housing is a bottomed cylindrical member provided so as to cover the passage member, and an end portion on the side opposite to the bottom portion is fixed to the fixing member. The fluid inflow portion is provided in the central portion of the outer wall surface of the cylindrical portion of the housing, and has a suction passage communicating with the fluid circulation space. The fluid outflow portion is provided at the center of the outer wall surface of the cylindrical portion of the housing and has a discharge passage communicating with the discharge passage.

Therefore, in the high-pressure pump, for example, when the housing is vibrated in the radial direction due to the vibration of the fluid inflow portion or the engine, resonance of the tubular portion can be suppressed.
Here, the “polygon” described as the cross-sectional shape of the outer wall surface and the inner wall surface in the present specification includes one having no rounded corners and one having rounded corners.

It is a figure explaining the high-pressure pump by 1st Embodiment of this invention. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is a figure which shows the cross section of a polygonal part among the cylinder parts of the housing of FIG. It is a figure showing the relationship between the vibration frequency and vibration acceleration of a cylinder part when the housing of FIG. 3 is vibrated in the radial direction. It is a figure which shows the cross section of the polygonal part among the cylinder parts of the housing of the high-pressure pump by 2nd Embodiment of this invention. It is a figure which shows the cross section of a polygonal part among the cylinder parts of the housing of the high-pressure pump by 3rd Embodiment of this invention. It is a figure which shows the cross section of the polygonal part among the cylinder parts of the housing of the high pressure pump by a comparative form.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. The configurations that are substantially the same between the embodiments are given the same reference numerals, and description thereof will be omitted.
(First embodiment)
A high pressure pump according to a first embodiment of the present invention is shown in FIG. The high-pressure pump 10 is a pump that supplies fuel to the injector of the engine.

First, the high-pressure pump 10 will be described with reference to FIGS.
The high-pressure pump 10 includes a fixed member 11, a cylinder 20, a plunger 30, a passage member 35, a housing 40, a suction valve 60 that is a fluid inflow portion, and a discharge valve 70 that is a fluid outflow portion. In the following description, the upper side of the plane of FIG. 1 is “upper” and the lower side of the plane of FIG. 1 is “lower”.

The fixing member 11 includes a flange portion 12 that can be fixed to the outer wall of the engine, a cylindrical cylinder holding portion 13 protruding upward from the flange portion 12, and a cylindrical engine fitting protruding downward from the flange portion 12. And a section 14.
The cylinder 20 has a cylindrical shape with a bottom, a bottom end 21 is located above the opening end 22, and is provided so as to penetrate the fixing member 11. The cylinder 20 is fixed to the cylinder holding portion 13 of the fixing member 11 by press fitting, for example.

The plunger 30 is inserted into the cylinder 20 through the opening end 22 of the cylinder 20, and is supported by the inner wall of the cylinder 20 so as to be reciprocally movable in the axial direction. An upper end portion 31 of the plunger 30 defines a pressurizing chamber 24 with the bottom surface 23 of the cylinder 20. The plunger 30 is biased downward by a spring 34 via a spring seat 33 provided at a lower end portion 32. The volume of the pressurizing chamber 24 increases or decreases in conjunction with the vertical movement of the plunger 30.

The passage member 35 has a longitudinal shape in a direction orthogonal to the axial direction of the plunger 30, and has a housing hole 36 penetrating the center of the longitudinal direction in the lateral direction, and extends from the housing hole 36 to one of the longitudinal directions. It has a suction passage 37 and a discharge passage 38 extending from the accommodation hole 36 to the other in the longitudinal direction. The bottom end 21 of the cylinder 20 is press-fitted into the accommodation hole 36, for example. The suction passage 37 communicates with the pressurizing chamber 24 through the suction hole 25 of the cylinder 20. The discharge passage 38 communicates with the pressurizing chamber 24 through the discharge hole 26 of the cylinder 20.

The housing 40 has a bottomed tubular shape, is provided so as to cover the passage member 35, and an end portion of the tubular portion 41 on the opposite side of the bottom portion 42 is fixed to the fixing member 11. The tubular portion 41 surrounds the bottom end 21 of the cylinder 20 and the passage member 35, and is fixed to the flange portion 12 of the fixing member 11 by, for example, welding. The bottom portion 42 closes the upper end portion of the tubular portion 41 and is formed integrally with the tubular portion 41. The tubular portion 41 has a first mounting hole 43 whose circumferential position matches the suction passage 37, a second mounting hole 44 whose circumferential position matches the discharge passage 38, and a third mounting hole to which the inlet pipe 48 is mounted. And 45.

The tubular portion 41 has a fuel gallery 46 that is a fluid circulation space and a fluid storage space. A pulsation damper 47 for reducing fuel pressure pulsation is provided between the bottom portion 42 of the housing 40 and the passage member 35 in the fuel gallery 46. The fuel in the fuel gallery 46 is supplied to the pressurizing chamber 24 through the communication hole 39 of the passage member 35 and the suction passage 37.

The intake valve 60 is an electromagnetic valve that can open and close the intake passage 37, and includes a cylindrical housing 61, an intake valve body 62, an intake valve member 63, a spring 64, a movable core 65, a fixed core 66, a coil 67, and the like. .. The tubular housing 61 is inserted through the first mounting hole 43 of the tubular portion 41 of the housing 40 and is fixed to the inner wall of the suction passage 37 of the passage member 35 by, for example, screw fastening. The gap between the tubular housing 61 and the housing 40 is sealed by welding, for example.

When the coil 67 is energized, the movable core 65 is attracted to the fixed core 66 side, and the suction valve member 63 is seated on the suction valve body 62. Further, the spring 64 separates the intake valve member 63 from the intake valve body 62 when the coil 67 is de-energized. The suction valve member 63 closes the suction passage 37 when seated on the suction valve body 62, and opens the suction passage 37 when separated from the suction valve body 62.

The discharge valve 70 can open and close the discharge passage 38, and includes a tubular housing 71, a discharge valve body 72, a discharge valve member 73, and a spring 75. The tubular housing 71 is inserted through the second mounting hole 44 of the tubular portion 41 of the housing 40 and is fixed to the inner wall of the discharge passage 38 of the passage member 35 by, for example, screw fastening. The gap between the cylindrical housing 71 and the housing 40 is sealed by welding, for example.

When the pressure of the fuel in the pressurizing chamber 24 becomes equal to or higher than a predetermined value, the discharge valve member 73 receives the pressure of the fuel and separates from the discharge valve body 72. Further, the spring 75 seats the discharge valve member 73 on the discharge valve body 72 when the fuel pressure in the pressurizing chamber 24 falls below a predetermined value. The discharge valve member 73 opens the discharge passage 38 when separated from the discharge valve body 72, and closes the discharge passage 38 when seated on the discharge valve body 72.

In the high-pressure pump 10 configured as described above, when the suction valve 60 opens the suction passage 37, the fuel in the pressurizing chamber 24 is not pressurized even when the plunger 30 moves upward, and passes through the suction passage 37. Then, the fuel is returned to the fuel gallery 46.
On the other hand, when the suction valve 60 closes the suction passage 37, the fuel in the pressurizing chamber 24 is pressurized when the plunger 30 rises, and when the pressure exceeds a predetermined value, the discharge valve 70 is pushed open and discharged. It

Next, a detailed configuration of the housing 40 will be described based on FIG.
The tubular portion 41 of the housing 40 forms a first circular portion 51, a polygonal portion 52, and a second circular portion 53 in order from the bottom portion 42 side. The first circular portion 51 and the second circular portion 53 have a circular cross-sectional shape on both the outer wall surface and the inner wall surface, and the radial thickness is substantially constant in the circumferential direction.

The cross-sectional shape of the outer wall surface 54 of the polygonal portion 52 is polygonal. In the present embodiment, the outer wall surface 54 has an octagonal cross-sectional shape, and the outer wall surface 54 includes eight corners 55 and eight surfaces 56.

The radial thickness of the polygonal portion 52 changes in the circumferential direction. A portion of the tubular portion 41 corresponding to a corner portion (near the corner 55) of the outer wall surface 54 is defined as an outer wall corner portion 57, and a portion of the tubular portion 41 corresponding to a central portion of the surface 56 of the outer wall surface 54 is defined. When defined as the outer wall central portion 58, the radial thickness t1 of the outer wall corner portion 57 is larger than the radial thickness t2 of the outer wall central portion 58.

The radial thickness t1 of the outer wall corner portion 57 is the maximum radial thickness of the tubular portion 41. The radial thickness t2 of the outer wall central portion 58 is the minimum radial thickness of the tubular portion 41. The radial thickness of the tubular portion 41 changes so as to continuously increase in the circumferential direction from the outer wall central portion 58 to the outer wall corner portion 57. In the present embodiment, the inner wall surface 59 of the polygonal portion 52 has a circular cross-sectional shape, thereby creating a difference in thickness in the circumferential direction.

Here, consider the comparative form shown in FIG. In the comparative example, the thickness of the tubular portion 101 of the housing 100 is substantially constant in the circumferential direction, and the outer wall surface 102 and the inner wall surface 103 of the tubular portion 101 have a polygonal cross section. When such a housing 100 is vibrated in the radial direction by, for example, driving an intake valve or vibrating the engine, the tubular portion 101 may resonate. In the resonance mode, a portion of the tubular portion 101 corresponding to a corner of the outer wall surface 102 serves as a node, and a portion of the tubular portion 101 corresponding to the center of the outer wall surface 102 serves as an antinode. The relationship between the vibration frequency and the vibration level of the tubular portion 101 at this time is as shown by the broken line in FIG. There is a resonant frequency between the vibration frequencies of 18-19 kHz.

On the other hand, in the present embodiment, by providing the thickness difference as described above, the rigidity of the outer wall corner portion 57 is higher than that of the comparative embodiment, and the mass of the outer wall surface central portion 58 is small. Has become. Therefore, as shown by the solid line in FIG. 5, in the present embodiment, the resonance frequency is relatively large and is out of the audible range on the high frequency side. Compared with the comparative example, the vibration level near the vibration frequency of 17 to 19 kHz of the present embodiment is lowered.

As described above, in the first embodiment, the housing 40 has the tubular portion 41 having the fuel gallery 46 as the fluid circulation space therein, and the outer wall surface 54 has a polygonal cross section. The radial thickness t1 of the outer wall corner portion 57 is larger than the radial thickness t2 of the outer wall surface central portion 58.
With this configuration, the rigidity of the outer wall corner portion 57, which is the node of resonance, is increased, and the mass of the outer wall surface central portion 58, which is the antinode of resonance, is reduced. As a result, the resonance frequency of the tubular portion 41 of the housing 40 can be shifted to the high frequency side by a relatively large amount and moved outside the audible range. Therefore, resonance can be effectively suppressed.

Further, in the first embodiment, the radial thickness t1 of the outer wall corner portion 57 is the maximum value of the radial thickness of the tubular portion 41. The radial thickness t2 of the outer wall central portion 58 is the minimum radial thickness of the tubular portion 41.
Therefore, the rigidity of the outer wall corner portion 57, which is a node of resonance, can be increased while reducing the weight of the housing 40.

Further, in the first embodiment, the radial thickness of the tubular portion 41 changes so as to continuously increase in the circumferential direction from the outer wall central portion 58 to the outer wall corner portion 57.
Therefore, a step does not occur on the inner wall of the tubular portion 41, and it is possible to eliminate locations where stress is concentrated as much as possible.

Further, in the first embodiment, the inner wall surface 59 of the polygonal portion 52 has a circular cross-sectional shape.
This, in combination with the polygonal cross section of the outer wall surface 54, creates a difference in the thickness of the tubular portion 41 in the circumferential direction.

Further, in the first embodiment, the high pressure pump 10 includes the housing 40 as described above.
Therefore, it is possible to suppress the occurrence of resonance of the housing 40 due to the drive of the intake valve 60 provided in the tubular portion 41 and the vibration of the engine. Therefore, it is possible to suppress the generation of noise due to the resonance of the housing 40.

(Second embodiment)
In the second embodiment of the present invention, the tubular portion 81 of the housing 80 forms a polygonal portion 82.
The radial thickness of the polygonal portion 82 changes in the circumferential direction. A portion of the tubular portion 81 corresponding to a corner portion (near the corner 55) of the outer wall surface 54 is defined as an outer wall corner portion 83, and a portion of the tubular portion 81 corresponding to a central portion of the surface 56 of the outer wall surface 54 is defined. When defined as the outer wall central portion 84, the radial thickness t1 of the outer wall corner portion 83 is larger than the radial thickness t2 of the outer wall central portion 84.

The radial thickness t1 of the outer wall corner portion 83 is the maximum radial thickness of the tubular portion 81. The radial thickness t2 of the outer wall surface central portion 84 is the minimum radial thickness of the tubular portion 81. The radial thickness of the tubular portion 81 changes so as to continuously increase in the circumferential direction from the outer wall central portion 84 to the outer wall corner portion 83. In the present embodiment, the cross-sectional shape of the inner wall surface 85 of the tubular portion 81 is a polygon having the same number of corners as the cross-sectional shape of the outer wall surface 54, and the corner portion of the inner wall surface 85 corresponds to the outer wall central portion 84. positioned. By forming the inner wall surface 85 in this way, a difference in thickness in the circumferential direction is created.

Thus, even if the cross-sectional shape of the inner wall surface 85 of the tubular portion 81 is polygonal, the radial thickness t1 of the outer wall corner portion 83 can be made larger than the radial thickness t2 of the outer wall central portion 84. Therefore, similarly to the first embodiment, the resonance frequency of the tubular portion 81 of the housing 80 can be shifted to a high frequency side by a relatively large amount and brought out of the audible range. Therefore, resonance can be effectively suppressed.

(Third Embodiment)
In the third embodiment of the present invention, the tubular portion 91 of the housing 90 forms a polygonal portion 92.
The radial thickness of the polygonal portion 92 changes in the circumferential direction. A portion of the tubular portion 91 corresponding to a corner portion (near the corner 55) of the outer wall surface 54 is defined as an outer wall corner portion 93, and a portion of the tubular portion 91 corresponding to a central portion of the surface 56 of the outer wall surface 54 is defined. When defined as the outer wall central portion 94, the radial thickness t1 of the outer wall corner portion 93 is larger than the radial thickness t2 of the outer wall central portion 94.

The radial thickness t1 of the outer wall corner portion 93 is the maximum radial thickness of the tubular portion 91. The radial thickness t2 of the outer wall central portion 94 is the minimum radial thickness of the tubular portion 91. In the present embodiment, the inner wall surface 95 of the tubular portion 91 has a concave portion 96 that is recessed radially outward at the position of the outer wall central portion 94. By forming the inner wall surface 95 in this manner, a difference in thickness in the circumferential direction is created.

Even when the concave portion 96 is formed on the inner wall surface 95 of the tubular portion 91 in this manner, the radial thickness t1 of the outer wall corner portion 93 can be made larger than the radial thickness t2 of the outer wall central portion 94. Therefore, similarly to the first embodiment, the resonance frequency of the tubular portion 91 of the housing 90 can be relatively shifted to the high frequency side and moved outside the audible range. Therefore, resonance can be effectively suppressed.

(Other embodiments)
In another embodiment of the present invention, the radial thickness of the tubular portion of the housing may be maximum in portions other than the outer wall corner portions or may be minimum in portions other than the outer wall central portion.
In another embodiment of the present invention, the radial thickness of the tubular portion may be gradually increased in the circumferential direction from the outer wall central portion to the outer wall corner portion. That is, a step may be formed on the inner wall surface of the cylindrical portion of the housing.
In another embodiment of the present invention, the cross-sectional shape of the outer wall surface of the cylindrical portion of the housing may be a polygon other than an octagon.

In another embodiment of the present invention, the tubular portion of the housing may not form the circular portion but only the polygonal portion.
In other embodiments of the invention, the housing application is not limited to high pressure pumps. In short, the housing has a cylindrical portion having a fluid circulation space therein, and the outer wall surface may have a polygonal cross section, and may be used for other devices.
The present invention is not limited to the above-described embodiments, and can be implemented in various forms without departing from the spirit of the invention.

10... High-pressure pump 40, 80, 90... Housing 41, 81, 91... Cylindrical part 46... Fuel gallery (fluid distribution space)
54... Outer wall surface 57, 83, 93... Outer wall corner portion 58, 84, 94... Outer wall surface central portion t1, t2... Radial thickness

Claims (7)

A cylindrical portion (41, 81, 91) having a fluid circulation space (46) therein is formed, and a polygonal portion (52, 82, 52) in which a mounting hole (43) for an electromagnetic valve is formed in the cylindrical portion. 92) a housing whose outer wall surface (54) has a polygonal cross section,
A portion of the polygonal portion corresponding to a corner of the outer wall surface is defined as an outer wall corner portion (57, 83, 93), and a portion of the polygonal portion corresponding to a surface center portion of the outer wall surface is defined as an outer wall center. When defined as part (58, 84, 94),
A housing in which a radial thickness (t1) of the outer wall corner portion is larger than a radial thickness (t2) of the outer wall central portion at an axial position that coincides with the mounting hole . The radial thickness of the outer wall corner portion is the maximum value of the radial thickness of the tubular portion,
The housing according to claim 1, wherein the radial thickness of the central portion of the outer wall surface is the minimum value of the radial thickness of the tubular portion. The housing according to claim 1 or 2, wherein a radial thickness of the polygonal portion is continuously increased in a circumferential direction from a central portion of the outer wall surface to a corner portion of the outer wall. The housing according to any one of claims 1 to 3, wherein the inner wall surface (59, 85, 95) of the tubular portion has a circular cross-sectional shape. The cross-sectional shape of the inner wall surface of the tubular portion is a polygon having the same number of corners as the cross-sectional shape of the outer wall surface,
The housing according to claim 1, wherein a corner portion of the inner wall surface is located at a central portion of the outer wall surface. The housing according to any one of claims 1 to 3, wherein an inner wall surface of the cylindrical portion has a recess (96) that is recessed radially outward at a position of the central portion of the outer wall surface. A fixing member (11),
A plunger (30) that is reciprocally movable in the axial direction and forms a pressurizing chamber (24);
A passage member (35) having an intake passage (37) and a discharge passage (38) communicating with the pressurizing chamber,
It is a bottomed cylindrical member, is provided so that it may cover the said passage member, and the edge part on the opposite side to a bottom part is being fixed to the said fixing member, The any one of Claims 1-6. A housing (40),
A fluid inflow portion (60) provided in the central portion of the outer wall surface and having a suction passage communicating with the fluid circulation space;
A fluid outflow portion (70) provided in the central portion of the outer wall surface and having a discharge passage communicating with the discharge passage;
High-pressure pump equipped with.

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