JPH04132294U - Pulsation absorber - Google Patents

Abstract

(57) [Summary] [Purpose] To form a slit as a control flow path without cutting the pole. [Structure] A fuel introduction passage 15 and a fuel discharge passage 14 are formed in the housing 11 which forms a fuel chamber 16 together with the diaphragm 12, and a pole 35 is arranged at a position facing the diaphragm mounting opening 36 of the housing 11. In the pulsation absorbing device configured to absorb pulsations by displacement of the diaphragm 12, the pole 35 and the housing 11 are integrally molded by a die-casting mold, and the slit 35a connects the pole 35 to the fuel introduction passage 15.
and a fuel chamber 16. [Effect] Since the slit 35a is integrally molded with the pole 35, there is no need to cut the slit 35a into the pole 35 again, and manufacturing costs can be reduced.
Moreover, this housing 11 is a housing 1 of a pressure control valve.
Since it can also be used as 1A, the overall manufacturing cost can be further reduced.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a pulsation absorbing device, and in particular, to absorbing pulsation occurring in a vehicle's fuel system. For example, a fuel supply device that supplies fuel to an engine's fuel injection device. Concerning what is useful and effective.

0002

[Conventional technology]

Pulsation absorption used in fuel supply devices that supply fuel to engine fuel injection devices As a device, the case where the fuel discharge pipe is connected to the side wall (virtually the housing It consists of ) and are placed inside this case to form a fuel introduction path, Some are equipped with a pole into which a feed pipe is fitted.

0003

[Problem that the idea aims to solve]

However, in conventional pulsation absorbers, the case and pole are each separated. The central part of the pole or diaphragm is fabricated to ensure a controlled flow path. Cutting a slit into the armature (corresponding to the receiver described later). is being carried out. For this reason, after the pole or armature has been machined, a separate process is required. slit processing has to be performed using a slit, which increases manufacturing costs.

0004 The purpose of this invention is to provide control flow without cutting the pole or armature. An object of the present invention is to provide a pulsation absorbing device capable of forming a slit for a passage.

[0005]

[Means to solve the problem]

The pulsation absorbing device according to the present invention includes a housing that forms a control chamber together with a diaphragm. A first flow path communicating with the control chamber is formed on the side wall of the housing, and the diaphragm of the housing A pole forming a second flow path communicating with the control room is arranged at a position facing the wearing opening. The pulsation absorber is configured to absorb pulsations by displacement of the diaphragm. In the device, The pole and the housing are integrally molded by die-casting, and the pole and housing are integrally formed by die-casting. A slit for a control flow path is integrally formed in the control flow path so as to communicate the second flow path and the fluid chamber. It is characterized by being formed.

[0006]

[Effect]

According to the above-mentioned means, the pole and the housing are integrally molded by die-casting. Therefore, when forming the pole and housing with the die-casting mold, the pole is controlled. A slit serving as a flow path can be formed at the same time. For this reason, there is no slip on the pole. This eliminates the need for a cutting process to form the grooves, reducing manufacturing costs. Wear.

[0007]

【Example】

Fig. 1 is a side sectional view showing a pulsation absorbing device which is an embodiment of the present invention, and Fig. 2 is a pulsation absorbing device according to the present invention. A side sectional view showing the housing of the dynamic absorption device, Figure 3 is also a rear view, and Figure 4 is a diagram. FIG. 5 is a side cross-sectional view showing the flam assembly process; FIG. 5 is a side cross-sectional view showing the caulking process; FIG. is a side view showing an example in which the housing of the pulsation absorber is applied to a fuel pressure control valve. FIG.

[0008] In this embodiment, the pulsation absorbing device 10 according to the present invention can be used in common with the fuel pressure control valve. The housing 11 and diaphragm 12 are made of die-casting. , and is equipped with a pole 35. The housing 11 and the pole 35 are made into a die-casting mold. Therefore, it is integrally molded. A side wall of this housing 11 has a fuel passage as a first flow path. A fuel discharge passage 14 is provided, and a fuel discharge passage 14 is provided in the pole 35 as a second passage. An introduction path 15 is established, and a fuel chamber serving as a control chamber is provided between both flow paths 14 and 15. 16 are formed.

[0009] A pipe pressure inlet 15a is formed on the inlet side of the fuel introduction passage 15. A feed pipe 17 as a liquid passage pipe is press-fitted into the feed pressure inlet 15a. This housing 11 is installed at the intermediate part and outlet side of the fuel introduction passage 15 to control the fuel pressure. Valve spring mounting part 38 and spherical valve body for common use as a control valve housing A mounting portion 37 is formed. In other words, the spherical valve body mounting portion 37 and the valve sprocket The ring mounting portion 38 is configured to substantially form the fuel introduction passage 15 on the inner peripheral side of the pole 35. It is attached to the sea urchin.

0010 The pole 35 is located at a position facing the diaphragm mounting opening 36 of the housing 11. The height of the pole 35 is the same as that of the diaphragm at the specified fuel pressure. The movement amount of 12 is set to be within an appropriate range.

[0011] The inner diameter of the spherical valve body mounting portion 37 is such that this housing 11 is a housing of a fuel pressure control valve. The ball diameter is set so that the spherical valve body (ball) 13 can be inserted when used as a The dimensions are set to be approximately equal to. In addition, the valve spring of the spherical valve body mounting portion 37 A tapered portion 39 is formed at the boundary with the plug mounting portion 38. Insert the spherical valve body 13 itself or a jig with the same shape into the tapered portion 39. The valve seat surface has a concave spherical surface that imitates the convex spherical surface of the spherical valve body 13. 43 is formed.

0012 Furthermore, in this embodiment, the end surface of the spherical valve body mounting portion 37 on the side of the fuel chamber 16, That is, the upper end surface of the pole 35 has a plurality of slits 35a as control flow paths. It is simultaneously molded using an Ikast mold. Each slit 35a has an appropriate distance in the circumferential direction. Vertical narrow grooves arranged at intervals and having a depth reaching the upper end of the tapered portion 39 The fuel introduction passage 15 and the fuel chamber 16 communicate with each other. Ru.

[0013] At the flange portion 19 of the housing 11 integrally formed by aluminum die-casting, The surface has a circular ring-shaped annular groove 41 into which the rib 40 of the diaphragm 12 can be press-fitted. is formed. By the way, the rib 40 of the diaphragm 12 is integrally formed into a substantially disk shape. They are arranged concentrically on the outer periphery of the inner main surface of the molded diaphragm 12. It is integrally protruded into a circular ring shape.

[0014] The diaphragm 12 forms a part of the wall surface of the fuel chamber 16, and the diaphragm 12 forms part of the wall surface of the fuel chamber 16. It is fixed to the hinge part 19 together with a case 21 that constitutes an atmospheric chamber 20. This da A holding hole 22 is formed in the center of the earphragm 12. A receiver 23 as an armature is attached. The outer diameter of the receiver 23 is The lower surface of the receiver 23 is formed on the top of the pole 35. By contacting the surface, the opening of the fuel introduction passage 15 can be closed leaving each slit 35a. The sea urchin is turning. The other end of the receiver 23 is a support plate 2 that is in contact with the diaphragm 12. It is fixed to 4. A coil spring is installed between the support plate 24 and the end wall of the case 21. A return spring 25 consisting of a ring is interposed in a stored force state, and the diaphragm The arm 12 is always urged toward the pole 35 by the urging force of the return spring 25. Due to the biasing force of the return spring 25, the receiver 23 is moved toward the outlet side of the fuel introduction path 15. It is designed to constantly push in the direction of closure. Therefore, as an armature The receiver 23 is in a state in which the fuel introduction passage 15 is always closed, leaving a portion of each slit 35a. It has become.

[0015] Then, fuel is supplied into the fuel chamber 16 from the fuel introduction path 15, and the fuel is supplied into the fuel chamber 16. When the pressure increases, the diaphragm 12 resists the biasing force of the return spring 25. Then, it is moved to the atmospheric chamber 20 side. At this time, the acceptance as an armature is The fitting 23 is moved toward the atmospheric chamber 20 by the pressure of the fuel and is removed from the end surface of the pole 35. Therefore, the exit side of the fuel introduction path 15 is wide open. In other words, the fuel introduction path 15 and the fuel discharge passage 14 communicate through the outlet of the fuel introduction passage 15 and the fuel chamber 16. Since the valve becomes open and the volume of the fuel chamber 16 increases, pulsation is absorbed. It will be.

[0016] Here, the configuration of the housing 11 before assembly will be explained. In Figures 2 and 3 As shown, this pulsation absorbing device 10 is installed on the outside of the housing 11, such as a machine frame. The mounting flange 26 for mounting on is integrally molded by die-casting. The mounting flange 26 is disposed outside the fuel discharge passage 14 and integrally protrudes from the fuel discharge passage 14. ing. This mounting flange 26 is formed into a substantially oval flat plate shape, and the fuel discharge passage 1 4 and projecting in a bilaterally symmetrical manner. mounting flange A through hole 27 that substantially constitutes the fuel discharge path 14 is provided in the center of the pipe 26. Mounting holes 28 and 29 are opened on both sides of the through hole 27 of the mounting flange 26, respectively. It is set up. A connection port 30 is provided at the edge of the through hole 27 of the mounting flange 26. It is integrally molded into a cylindrical shape and protrudes in a direction perpendicular to the attached flange 26. A groove 3 for fitting a seal ring (not shown) is provided at the tip of the connection port 30. 1 is integrally molded.

[0017] A first seat surface 32 is provided on the diaphragm side end surface of the mounting flange 26. It is formed into a flat plate shape so as to be substantially perpendicular to the axis of the pipe press inlet 15a. Also, ha A boss 33 is formed to bulge on the back side of the housing 11 opposite to the mounting flange 26. A second seat surface 34 is attached to the diaphragm side end surface of this boss 33 with a mounting flange. Similar to the first seat surface 32 of the pipe 26, the groove is substantially perpendicular to the axis of the pipe inlet 15a. It is formed into a flat plate. Furthermore, these first seat surfaces 32 and second seat surfaces 34 are substantially the same. It is formed to constitute one plane.

[0018] Next, assemble the case 21 and the diaphragm unit 44 to the housing 11. The following describes the process of manufacturing a pulsation absorbing device.

[0019] As shown in FIG. 4, a pole 35 having a slit 35a is attached to an aluminum die. A diaphragm unit 44 is attached to the cast-molded housing 11. child At this time, the jig 42 is inserted into the fuel introduction path 15, and the tip of the jig 42 touches the receiver 2. 3 is supported, the rib 40 of the diaphragm 12 is inserted into the annular groove of the housing 11. 41. The diaphragm unit 44 is supported by this jig 42. Therefore, the diaphragm 12 does not warp and the rib 40 is placed inside the annular groove 41. It is inserted properly. Therefore, the diaphragm unit 44 is attached to the housing 11. It can be installed properly and reliably.

[0020] Note that the diaphragm unit 44 has a receiver 23 and a support on the diaphragm 12. The holding plate 24 is fixed, and the return spring 25 is fixed to the supporting plate 24. This unit is assembled in advance in a separate process.

[0021] Next, as shown in FIG. 5, the diaphragm unit 44 is attached. The case 21 is placed on the flange portion 19 of the housing 11 with the diaphragm unit 44 on top. It is covered as if to cover it.

[0022] Subsequently, the open end side end of the case 21 is caulked radially inward, and the case 21 is caulked radially inward. 21 is fixed to the flange portion 19 of the housing 11.

[0023] In the process of covering and caulking the case 21, the fuel discharge passage 15 is With the tool 42 inserted, the case 21 is covered and caulked. The elastic force of the return spring 25 is applied to the diaphragm during mounting, covering, and caulking. Any action on the ram 12 is prevented. As a result, the diaphragm 12 is 1 and the flange portion 19 from occurring. The caulking process is performed in a stable state.

[0024] After the case 21 is fixed to the housing 11 as described above, the jig 42 is pulled. It gets ripped out. Then, as shown in phantom lines in FIG. 5, the mounting flange 26 is A jig 45 is applied to the first seat surface 32 and the second seat surface 34 of the boss portion 33, and the housing The feed pipe 17 is press-fitted into the pipe press-in port 15a of the pipe 11.

[0025] At this time, the reaction force accompanying the press-fitting of the pipe is transmitted through the first seat surface 32 and the second seat surface 34. Since it acts on the jig 45, the stress when press-fitting the feed pipe 17 is applied to the diaphragm. Acting on the ram 12 etc. will be avoided.

[0026] According to this embodiment, the housing 11 and the pole 35 are integrally formed by die-casting. In addition, a slit 35a is formed in the pole 35 at the same time during die-casting. Therefore, it is not necessary to cut the slit 35a in the pole 35, and the manufacturing process is reduced. Cost can be reduced.

[0027] Figure 6 shows a fuel pressure control system in which the housing of the pulsation absorber according to the above configuration is used. It is a side sectional view showing a control valve.

[0028] In the fuel pressure control valve 10A according to the present embodiment, the pulsation absorbing device according to the embodiment The housing 11 of the housing 10 is used as the housing 11A in the fuel pressure control valve. In the case where the second flow path 15 is used as a fuel discharge path and the first flow path 14 is used as a fuel It is used as a route for introducing water. In addition, a valve spring is attached to the valve spring mounting portion 38. The ring 18 is inserted, and the spherical valve body 13 is inserted into the spherical valve body mounting portion 37. moreover , the feed pipe 17 is used as a return pipe.

[0029] With these, the housing 11 of the pulsation absorber is connected to the housing of the fuel pressure control valve 10A. 11A, the same housing can be used as a pulsation absorbing device. The overall manufacturing cost can be reduced by sharing the fuel pressure control valve 10A with the fuel pressure control valve 10A. can be reduced.

[0030]

[Effect of the idea]

As explained above, according to the present invention, the pole and the housing are formed by die-casting. It is integrally molded using a shape mold, and the slit is integrally formed on the pole during molding. No cutting work is required to create slits in the pole. Therefore, manufacturing costs can be reduced. This housing also has pressure Since it can be used as a housing for valves, the overall manufacturing cost is further reduced. can be reduced to

[Brief explanation of drawings]

FIG. 1 is a side cross-sectional view showing a pulsation absorbing device that is an embodiment of the present invention.

FIG. 2 is a side sectional view showing the housing of the pulsation absorbing device.

FIG. 3 is a rear view as well.

FIG. 4 is a side cross-sectional view showing a diaphragm assembly process.

FIG. 5 is a side cross-sectional view showing a caulking process.

FIG. 6 is a side sectional view showing an embodiment in which the housing of the pulsation absorbing device is applied to a fuel pressure control valve.

[Explanation of symbols]

10... Pulsation absorber, 10A... Fuel pressure control valve, 11,
11A... Housing, 12... Diaphragm, 13... Spherical valve body (steel ball, ball), 14... Fuel discharge path (first flow path,
fuel introduction path), 15... fuel introduction path (second flow path, fuel discharge path), 15a... pipe pressure inlet, 16... fuel chamber (control chamber), 17... feed pipe (return pipe), 18
...Valve spring, 19...Flange part, 20...Atmospheric chamber, 21...Case, 22...Holding hole, 23...Receiver (armature), 24...Support plate, 25...Return spring, 26...Flange part, 27...Through hole , 28, 29...Mounting hole, 30...Connection port, 31...Groove, 32...First seat surface,
33...Boss part, 34...Second seat surface, 35...Pole, 35a
... slit (control flow path), 36... opening for diaphragm attachment, 37... spherical valve body attachment part, 38... valve spring attachment part, 39... tapered part, 40... rib, 41... annular groove,
42...Jig, 43...Valve seat surface, 44...Diaphragm unit, 45...Jig.

Claims (1)

[Scope of utility model registration request] Claim 1: A first flow path communicating with the control chamber is formed in a side wall of the housing that forms the control chamber together with the diaphragm, and a second flow path communicating with the control chamber is formed at a position facing the diaphragm mounting opening of the housing. In a pulsation absorbing device that is configured to absorb pulsation by displacement of a diaphragm, the pole and the housing are integrally molded by die-casting, and the pole is provided with a control flow path. A pulsation absorbing device characterized in that a slit is integrally formed so as to communicate the second flow path and the fluid chamber.