JP5363773B2 - Plunger pump and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plunger pump for actualizing high fixing strength between a seat member and a pump housing while reducing manufacturing labor and time, and to provide its manufacturing method. <P>SOLUTION: The plunger pump 10 comprises the bottomed cylindrical seat member 11, and the cylindrical pump housing 12 inserted into the seat member 11, wherein a pump chamber P is formed in the pump housing 12. The seat member 11 and the pump housing 12 are fixed to each other via a solidified portion 21 which is solidified with a molten material 20 melted. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a plunger pump and a manufacturing method thereof.

  Conventionally, as a structure for fixing the seat member and the pump housing in the plunger pump, the pump housing is fitted to the bottomed cylindrical seat member, and the seal of the pump chamber in the inside and the holding of the pump housing are combined. There was a structure (see Patent Document 1).

JP 2006-274996 A

  However, in the pump chamber of the plunger pump, the pressure increase up to the pressure obtained by adding the master cylinder pressure and the discharge valve opening pressure and the pressure decrease due to the subsequent suction operation are alternately repeated. Use conditions such as changes and number of operations are severe. In the above configuration, since the seat member is fixed to the pump housing only by press-fitting the pump housing into the seat member, in order to obtain a desired fixing strength that can withstand the use conditions, the seat member and the pump It is necessary to increase the dimensional accuracy of the housing to reduce the dimensional tolerance, and there is a problem that much time and labor are required for manufacturing.

  From such a viewpoint, an object of the present invention is to provide a plunger pump that can obtain a high fixing strength between the seat member and the pump housing and a method for manufacturing the plunger pump while reducing labor and time for manufacturing.

The invention according to claim 1 that solves such a problem includes a bottomed cylindrical sheet member and a cylindrical pump housing that is inserted into the sheet member, and a pump chamber is formed in the pump housing. In the plunger pump, a molten material containing groove is formed in at least one of the inner peripheral surface of the seat member and the outer peripheral surface of the pump housing, and a gap is formed between the front end portion of the pump housing and the bottom portion of the seat member. The sheet member and the pump housing are fixed to each other via a solidified portion that is solidified after flowing the current between both members and melting the molten material by resistance heating. This is a featured plunger pump.

According to the configuration as described above, since the seat member and the pump housing are fixed through the solidified portion obtained by solidifying the molten material once melted, there is a dimensional tolerance between the seat member and the pump housing. However, it is possible to easily increase the fixing strength between the seat member and the pump housing, and to reduce the labor and time for manufacturing. Further, it is only necessary to melt the molten material, and it is not necessary to melt the sheet member and the pump housing. Therefore, the amount of heat necessary for fixing the sheet member and the pump housing (the amount of heat required for melting) can be reduced. Furthermore, by forming the housing groove for the molten material, the inner peripheral surface of the seat member and the outer peripheral surface of the pump housing are joined, and the fixing strength can be further increased.

The invention according to claim 2 is a plunger pump comprising a bottomed cylindrical sheet member and a cylindrical pump housing inserted into the sheet member, wherein a pump chamber is formed in the pump housing. A part of the outer peripheral surface of the housing is press-fitted into the seat member, and a cylindrical inflow space is formed between the inner peripheral surface of the seat member and the outer peripheral surface of the pump housing. The melt material inflow grooves are formed on both the inner peripheral surface of the seat member and the outer peripheral surface of the pump housing so as to face each other , and the melt material is melted in the inflow space and the melt material inflow groove. A solidified portion formed by solidification after forming the sheet member, and the seat member and the pump housing are fixed to each other via the solidified portion. Is Njaponpu.

According to the configuration as described above, since the seat member and the pump housing are fixed through the solidified portion obtained by solidifying the molten material once melted, there is a dimensional tolerance between the seat member and the pump housing. However, it is possible to easily increase the fixing strength between the seat member and the pump housing, and to reduce the labor and time for manufacturing. Further, it is only necessary to melt the molten material, and it is not necessary to melt the sheet member and the pump housing. Therefore, the amount of heat necessary for fixing the sheet member and the pump housing (the amount of heat required for melting) can be reduced. Further, since the inflow space and the molten material inflow groove are formed, the molten material efficiently spreads over the entire inflow space and the molten material inflow groove, so that the seat member and the pump housing are spread over a wide cylindrical range. The fixing strength can be greatly increased. In addition, the fixing strength is further increased because the fixing is performed by the press-fitting and the solidified portion. Further, since a gap (inflow space) is formed between the inner peripheral surface of the seat member and the outer peripheral surface of the pump housing, when the pump housing is press-fitted into the seat member, the inflow space portion of the seat member The inner peripheral surface prevents the pump housing from being tilted, and can prevent collapse during press-fitting.

According to a third aspect of the present invention, in the pump housing, a part of the outer peripheral surface thereof is press-fitted into the seat member, and the fusion between the inner peripheral surface of the seat member and the outer peripheral surface of the pump housing is performed. The plunger pump according to claim 1 , wherein a cylindrical inflow space into which a material flows is formed, and the solidified portion is formed in the inflow space.

  According to the above configuration, since the molten material efficiently spreads over the entire inflow space, the seat member and the pump housing can be fixed over a wide cylindrical range, and the fixing strength is greatly increased. Can be increased. In addition, the fixing strength is further increased because the fixing is performed by the press-fitting and the solidified portion. Further, since a gap (inflow space) is formed between the inner peripheral surface of the seat member and the outer peripheral surface of the pump housing, when the pump housing is press-fitted into the seat member, the inflow space portion of the seat member The inner peripheral surface prevents the pump housing from being tilted, and can prevent collapse during press-fitting.

The invention according to claim 4 is the plunger pump according to claim 2 or 3, wherein the portion corresponding to the inflow space on the outer peripheral surface of the pump housing is knurled. .

  According to the above configuration, the molten material flows into the groove of the knurled portion, so that the fixing strength can be further increased.

According to a fifth aspect of the present invention, there is provided a plunger pump manufacturing method comprising: a bottomed cylindrical sheet member; and a cylindrical pump housing inserted into the sheet member, wherein a pump chamber is formed in the pump housing. The molten material is accommodated in at least one of the inner peripheral surface of the seat member and the outer peripheral surface of the pump housing, and a gap is formed between the front end portion of the pump housing and the bottom portion of the seat member. Then, after being inserted into the sheet member, an electric current is passed between the sheet member and the pump housing so as to flow in the vicinity of the molten material, and the molten material is heated and melted by the resistance heat generation, and the sheet The molten material is solidified between the member and the pump housing to form a solidified portion, and the seat member and the pump housing are fixed to each other. It is a manufacturing method of a plunger pump, characterized by.

According to the manufacturing method as described above, since the seat member and the pump housing are fixed through the solidified portion obtained by solidifying the melted material once, there is a dimensional tolerance between the seat member and the pump housing. However, the fixing strength between the seat member and the pump housing can be easily increased, and the labor and time for manufacturing can be reduced. In addition, since the seat member and the pump housing are also heated and the wettability when the molten material is melted is increased, the solidified portion can be formed in a wide range, and as a result, the fixing strength between the seat member and the pump housing can be increased. it can. Furthermore, since the current flowing between the seat member and the pump housing flows in the vicinity of the molten material, the molten material can be efficiently heated and melted.

The invention according to claim 6 is a method of manufacturing a plunger pump comprising a bottomed cylindrical sheet member and a cylindrical pump housing inserted into the sheet member, wherein a pump chamber is formed in the pump housing. After the sheet member is installed on the lower electrode and the pump housing is inserted from the upper side of the sheet member, a molten material is installed on the upper end of the sheet member and the upper electrode is applied from the upper part of the molten material. The molten material is fixed by contact, and an electric current is directly passed to the molten material, the molten material is melted by the resistance heat generation, and the molten material is solidified between the sheet member and the pump housing. The plunger pump is manufactured by forming a portion and fixing the seat member and the pump housing to each other .

According to the manufacturing method as described above, since the seat member and the pump housing are fixed through the solidified portion obtained by solidifying the melted material once, there is a dimensional tolerance between the seat member and the pump housing. However, the fixing strength between the seat member and the pump housing can be easily increased, and the labor and time for manufacturing can be reduced. In addition, since the molten material easily generates heat and efficiently melts, it easily flows between the seat member and the pump housing. In addition, since the current flowing through the molten material flows to the lower electrode through the sheet member, the sheet member is also heated to ensure bendability, and the molten material is more likely to flow between the sheet member and the pump housing. .

In the invention according to claim 7, after the melted molten material is caused to flow into a molten material inflow groove formed on the inner peripheral surface of the sheet member and a molten material inflow groove formed on the outer peripheral surface of the pump housing. It is solidified, It is a manufacturing method of the plunger pump of Claim 6 .

  According to the plunger pump and the method for manufacturing the same according to the present invention, it is possible to obtain a high fixing strength between the seat member and the pump housing while reducing manufacturing effort and time.

(First embodiment)
Hereinafter, a first best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, the plunger pump 10 is used in, for example, a vehicle brake hydraulic pressure control device, and is mounted in a pump hole 2 formed in a base body (pump body) 1. The base body 1 is made of an extruded material or cast product made of an aluminum alloy having a substantially rectangular parallelepiped shape, and a flow path (oil path) for brake fluid, which is a fluid, is formed therein.

  The pump hole 2 is a stepped cylindrical hole and is formed so as to penetrate the bearing hole 3 from the side surface 1 a of the base 1. The pump holes 2 are formed in pairs on both sides of the bearing hole 3 where the eccentric cam 4 of the output shaft of the motor (not shown) rotates, and are opened so as to face each other with the bearing hole 3 interposed therebetween. Is formed. The pump hole 2 is formed such that its center line passes through the center of the bearing hole 3. The pump hole 2 communicates with a reservoir (not shown), and an intake passage 2a that leads brake fluid from the reservoir to the plunger pump 10 is opened. The pump hole 2 communicates with a flow path (not shown) connected to a hole (hole) in which an electronic device such as a solenoid valve or a pressure sensor is mounted, and a discharge flow path 2b for sending brake fluid to the flow path. Is open and in communication.

  The plunger pump 10 includes a seat member 11, a pump housing 12, a plunger 13, a return spring 14, a seal stopper 15, a suction valve means 16, a cap 17, a discharge valve means 18, a discharge side filter (see FIG. Not shown).

  The seat member 11 is made of a metal member such as a hardened steel having a bottomed cylindrical shape whose inner peripheral surface is formed into a cylindrical surface, and one end of the pump housing 12 is inserted (in this embodiment, press-fitted). It comes to contact. The sheet member 11 is press-fitted into (inserted into) the pump hole 2 so that the outer peripheral surface of the opening side end (right side in FIG. 1) is pressed against the inner peripheral surface of the pump hole 2, and its tip end The (opening side end) is configured to be locked to the stepped portion 2 c of the pump hole 2. A through hole serving as a discharge passage 11 a for discharging the brake fluid sucked into the pump chamber P toward the cap 17 is formed at the center of the bottom of the sheet member 11.

  The pump housing 12 is made of a cylindrical metal member such as hardened steel, for example, and a pump chamber P is formed therein. The pump chamber P is partitioned by the seat member 11, the pump housing 12, and the plunger 13. A suction valve means 16 is accommodated in the pump chamber P. The pump housing 12 is configured such that its outer peripheral surface faces the inner peripheral surface of the pump hole 2 with a gap. A locking recess 12a for holding the seal stopper 15 is formed on the outer peripheral surface of the end portion of the pump housing 12 on the bearing hole 3 side.

  The plunger 13 reciprocates the inner space of the pump housing 12 in accordance with the rotational movement of the eccentric cam 4 of the motor. The plunger 13 abuts on the eccentric cam 4 and a suction portion serving as a brake fluid suction port. 13 b, a sliding portion 13 c that reciprocates while sliding in the inner space of the pump housing 12, and a valve seat portion 13 d that serves as a valve seat for the suction valve means 16. A suction path 13 e is formed inside the plunger 13. The suction passage 13e communicates the annular space S1 formed around the suction portion 13b and the pump chamber P, and includes an outer peripheral surface of the suction portion 13b (outer peripheral surface of the plunger 13) and an end surface of the valve seat portion 13d ( It opens to the sheet member 11 side end surface of the plunger 13. A suction flow path 2a of the pump hole 2 is opened and communicated with the annular space S1.

  The contact portion 13a is loosely inserted in the pump hole 2, and the tip portion projects into the bearing hole 3 of the motor. An annular seal member 13h that abuts the pump hole 2 and a bush 13f are slidably attached to the contact portion 13a. The suction part 13 b is formed between the contact part 13 a and the sliding part 13 c, and at least a part of the suction part 13 b protrudes from the bearing hole 3 side opening part of the pump housing 12. The sliding part 13c is a part that slides in the inner space of the pump housing 12, and the outer diameter of the sliding part 13c is larger than the outer diameters of the suction part 13b and the valve seat part 13d adjacent thereto, and The inner diameter of the pump housing 12 is slightly smaller. The valve seat portion 13d is formed closer to the pump chamber P than the sliding portion 13c, and an annular seal ring 13g is provided around the valve seat portion 13d. The seal ring 13g seals the inside of the pump chamber P in a liquid-tight manner while sliding on the inner peripheral portion of the pump housing 12.

  The return spring 14 is disposed in a compressed state in the pump chamber P, and presses the plunger 13 toward the bearing hole 3 by its restoring force. The return spring 14 according to the present embodiment is disposed between the bottom portion of the seat member 11 and a seal ring 13g that is mounted on the plunger 13 via a proximal end portion of a retainer 16b described later, and the seal ring 13g. The plunger 13 is pressed via

  The seal stopper 15 is a frame-like member for preventing the seal member 13h from coming out, and a frame body 15a disposed so as to surround a part of the contact portion 13a and the suction portion 13b of the plunger 13, and the frame A locking piece 15b extending from the body 15a toward the pump housing 12 side. The locking piece 15b is held by the pump housing 12 by being locked to the locking recess 12a of the pump housing 12. ing.

  The suction valve means 16 opens and closes the suction passage 13e and is accommodated in the pump chamber P. More specifically, the suction valve means 16 includes a spherical suction valve body 16a disposed so as to close the opening of the suction passage 13e, a retainer 16b disposed so as to cover the suction valve body 16a, and a suction valve. A suction valve spring 16c is disposed between the body 16a and the retainer 16b in a compressed state. The suction valve body 16a is biased toward the plunger 13 by the restoring force of the suction valve spring 16c. The retainer 16b has a base end that is externally fitted to the valve seat 13d of the plunger 13, and is pressed against the seal ring 13g by the restoring force of the return spring 14.

  The cap 17 covers the bottom of the sheet member 11 from the outside, and is made of a bottomed cylindrical metal member that is separate from the sheet member 11. Inside the cap 17, a large-diameter recess 17a into which the bottom of the sheet member 11 is press-fitted and a small-diameter recess 17b having a smaller diameter than the large-diameter recess 17a are formed. The small-diameter concave portion 17 b divides and forms a discharge valve chamber S <b> 2 that accommodates the discharge valve means 18 together with the bottom of the sheet member 11.

  An annular locking groove 17 c is recessed in the outer peripheral surface of the cap 17 along the circumferential direction. The plastic deformation portion 2d formed in the hole wall of the pump hole 2 enters the locking groove 17c. In the present embodiment, the outer diameter of the outer lid portion 17e adjacent to the outer side of the locking groove 17c is smaller than the outer diameter of the inner lid portion 17d adjacent to the inner side (back side) of the locking groove 17c. . The inner lid portion 17d is substantially the same as the inner diameter inside the step portion of the inlet portion of the pump hole 2, and is inserted into that portion. The outer lid portion 17e protrudes from the bottom surface of the step portion of the inlet portion of the pump hole 2, and the peripheral portion of the protruding portion is chamfered.

  Of the cap 17, the outer diameter of the flow path component 17f located on the plunger 13 side is smaller than the inner diameter of the pump hole 2 into which the cap 17 is inserted, and the outer diameter of the flow path component 17f An annular space S3 communicating with the discharge flow path 2b of the base 1 is formed by the pump hole 2. The flow path component 17f is formed with an outlet hole 17g that allows the discharge valve chamber S2 and the annular space S3 to communicate with each other. The outlet hole 17g functions as an orifice that reduces pulsation associated with the reciprocating motion of the plunger 13.

  The discharge valve means 18 opens and closes the discharge passage 11a formed at the bottom of the sheet member 11, and is accommodated in the discharge valve chamber S2. More specifically, the discharge valve means 18 includes a spherical discharge valve body 18a disposed so as to block the discharge passage 11a of the sheet member 11, and a discharge valve spring 18b disposed in a compressed state in the discharge valve chamber S2. It is prepared for. The discharge valve body 18a is urged toward the discharge passage 11a by the restoring force of the discharge valve spring 18b.

  According to the plunger pump 10 configured as described above, the plunger 13 is elastically projected into the bearing hole 3 by the spring bias of the return spring 14.

  By the way, in this embodiment, as shown in FIG. 3B, the sheet member 11 and the pump housing 12 are solidified after the molten material 20 (see FIG. 3A) is once melted. These are fixed to each other via the solidified portion 21.

  As shown in FIG. 2, the molten material 20 is made of a low melting point material having a melting point lower than that of the sheet member 11 and the pump housing 12 made of, for example, hardened steel. That is, the molten material 20 is made of, for example, copper, silver, nickel, or the like. The molten material 20 is formed in a rod shape with a circular cross section, and is interposed between the inner peripheral surface of the sheet member 11 and the outer peripheral surface of the pump housing 12.

  The inner peripheral surface of the seat member 11 includes a press-fit portion 22 having an inner peripheral diameter substantially equal to the outer peripheral diameter of the pump housing 12, and an enlarged diameter portion 23 having an inner peripheral diameter slightly larger than the outer peripheral diameter of the pump housing 12. It is configured with. The press-fit portion 22 is disposed on the bottom side of the sheet member 11, and the enlarged diameter portion 23 is disposed on the opening side of the sheet member 11. According to such a configuration, when the pump housing 12 is press-fitted into the press-fit portion 22, a cylindrical gap is formed between the outer diameter surface of the pump housing 12 in the diameter-expanded portion 23, and this gap is An inflow space 24 into which the melted molten material 20 flows is formed. The melted molten material 20 flows into the inflow space 24 as appropriate by capillary action.

  A housing groove 25 for housing the molten material 20 is formed on the inner peripheral surface of the sheet member 11. The housing groove 25 is disposed at a boundary position between the press-fit portion 22 and the diameter-enlarged portion 23 and is formed in an annular shape along the circumferential direction of the inner peripheral surface of the sheet member 11. The housing groove 25 has a depth from the inner peripheral surface of the press-fit portion 22 that is the same as the outer diameter of the molten material 20, and the molten material 20 includes the bottom of the housing groove 25 and the outer peripheral surface of the pump housing 12. It comes to contact both. The bottom of the housing groove 25 is formed in an arc shape having a radius of curvature equivalent to that of the outer peripheral surface of the molten material 20, and ensures a large contact area with the molten material 20. The side wall of the housing groove 25 on the side of the enlarged diameter portion 23 is formed with a low opening end so as to be continuously connected to the surface of the enlarged diameter portion 23, and the melted molten material 20 flows into the inflow space 24 from the accommodation groove 25. It is easy to flow into.

  The pump housing 12 is inserted into the sheet member 11 in a state in which a gap is ensured between the bottom end (tip surface) of the bottom of the sheet member 11 and the bottom of the sheet member 11. That is, a part of the outer peripheral surface of the pump housing 12 is in contact with the press-fit portion 22 on the inner peripheral surface of the seat member 11, and the other part of the pump housing 12 is not in contact with the seat member 11.

  A portion corresponding to the enlarged diameter portion 23 of the seat member 11 (portion corresponding to the inflow space 24) on the outer peripheral surface of the pump housing 12 is knurled, and groove portions 32 intersecting in a plurality of directions are formed. Has been. As the molten material 20 flows into the groove 32, the fixing strength between the seat member 11 and the pump housing 12 is increased.

  Next, a method for manufacturing the plunger pump 10 having the above configuration will be described.

  In the manufacturing method of the plunger pump 10 according to the present invention, after the pump housing 12 is inserted into the seat member 11, the molten material 20 is once melted between the seat member 11 and the pump housing 12 and then solidified to be solidified. 21 is formed, and the seat member 11 and the pump housing 12 are fixed to each other.

  Below, the adhering process of the sheet | seat member 11 and the pump housing 12 is demonstrated in detail.

  First, the molten material 20 is laid and accommodated over the entire circumference of the accommodation groove 25 on the inner circumferential surface of the sheet member 11 (see FIG. 2). At this time, as for the molten material 20 accommodated in the ring shape, the outer peripheral surface (ring-shaped outer portion) is in contact with the bottom surface of the accommodating groove 25, and the inner peripheral surface (the opening side end portion of the accommodating groove 25) is the press-fit portion. It is located on the same plane as the surface of 22.

  Thereafter, as shown in FIG. 2, the pump housing 12 is press-fitted inside the seat member 11. At this time, the pump housing 12 is not inserted to the back of the sheet member 11, and a gap is formed between the front end portion and the bottom portion of the sheet member 11. Here, the seat member 11 and the pump housing 12 are in contact only by the press-fit portion 22.

  And it arrange | positions so that the sheet | seat member 11 may become an upper side and the pump housing 12 may become a lower side, and it pinches | interposes and fixes between electrodes 30 and 31. FIG. A current is passed between the electrodes 30 and 31 for a predetermined time, and the molten material 20 is melted by the resistance heat generation (Joule heat). Since a gap is formed between the front end portion of the pump housing 12 and the bottom portion of the sheet member 11, the current flows through the press-fit portion 22 of the sheet member 11 as indicated by an arrow in FIG. Pass through to pump housing 12. As a result, the sheet member 11 and the pump housing 12 in the vicinity of the accommodation groove 25 are heated (the range indicated by dot-shaped hatching in FIG. 3A), and the molten material 20 is efficiently melted. Due to the resistance heat generation, the sheet member 11 and the pump housing 12 do not melt, but only the molten material 20 melts.

  The melted molten material 20 flows into the inflow space 24 located below the accommodation groove 25 as shown in FIG. At this time, since the seat member 11 and the pump housing 12 in the vicinity of the accommodation groove 25 are heated, the wettability of the peripheral wall of the inflow space 24 is high, and the melt has occurred over the entire length (axial length) of the inflow space 24. The molten material 20 is easy to flow. Further, the melted molten material 20 enters the groove 32 by knurling applied to the outer peripheral surface of the pump housing 12. Note that the energization time is set so that the molten molten material 20 flows into the entire inflow space 24 and solidifies, and the energization is automatically stopped.

  Thereafter, when a predetermined time elapses, the molten material 20 is completely solidified between the inner peripheral surface of the enlarged diameter portion 23 of the sheet member 11 and the outer peripheral surface of the pump housing 12 to become the solidified portion 21, Fixing with the pump housing 12 is completed. In particular, since the solidified portion 21 meshes with the surface of the pump housing 12 while entering the groove portion 32, the fixing strength between the seat member 11 and the pump housing 12 is further increased.

  According to the plunger pump 10 and the manufacturing method thereof as described above, the seat member 11 and the pump housing 12 are fixed through the solidified portion 21 that is solidified after the molten material 20 is once melted. Even if there is a dimensional tolerance between the seat member 11 and the pump housing 12, the fixing strength of the seat member 11 and the pump housing 12 can be easily increased, and the labor and time for manufacturing can be reduced.

  In addition, the fixing strength is greatly increased as compared with the conventional case in which the pump housing is simply fitted to the seat member.

  Furthermore, since the melting material 20 is composed of a low melting point material having a melting point lower than that of the seat member 11 and the pump housing 12, the sheet member 11 and the pump housing 12 are fixed only by melting only the melting material 20. It is possible to reduce the amount of heat necessary for melting and to suppress the power consumption.

  Further, since the housing groove 25 for the molten material 20 is formed on the inner peripheral surface of the sheet member 11, the solidified portion 21 is located inside the joint surface between the sheet member 11 and the pump housing 12, and the fixed strength Can be further increased.

  Furthermore, since the cylindrical inflow space 24 into which the molten material 20 flows is formed continuously between the inner peripheral surface of the sheet member 11 and the outer peripheral surface of the pump housing 12, the molten molten material is formed. 20 smoothly flows into the inflow space 24 and is solidified to form a solidified portion 21. Therefore, the seat member 11 and the pump housing 12 can be fixed over a wide cylindrical range surrounding the pump housing 12, and the fixing strength can be greatly increased. If the thickness of the inflow space 24 is reduced, the melted molten material 20 efficiently flows into the entire inflow space and spreads by capillary action.

  In addition, since the sheet member 11 and the pump housing 12 are fixed by the press-fitting in the press-fitting portion 22 of the sheet member 11 and the solidified portion 21 in the diameter-expanded portion 23, not only the fixing strength is further increased, but also the molten material At the time of melting 20, the sheet member 11 and the pump housing 12 are temporarily fixed, and the melting operation is easy to perform.

  Further, since a gap (inflow space 24) is formed between the inner peripheral surface of the seat member 11 and the outer peripheral surface of the pump housing 12, the press-fit portion 22 that positions the pump housing 12 in the back of the seat member 11. When press-fitting into the pump housing 12, tilting is prevented by the inner peripheral surface (the enlarged diameter portion 23) of the seat member 11 in the inflow space 24, and the pump housing 12 can be prevented from being tilted during press-fitting, thereby facilitating press-fitting work.

  In addition, since the knurling process is performed on the portion corresponding to the inflow space 24 on the outer peripheral surface of the pump housing 12, the molten material 20 flows into the groove portion 32 of the knurled part. The surfaces of the two mesh with each other, and the fixing strength can be further increased.

  In the present embodiment, the melt material 20 is melted only by passing an electric current between the electrode member 30 and the electrode member 31 and the pump housing 12, so that the melting operation can be performed relatively easily, and the sheet Both the member 11 and the pump housing 12 can be heated, the wettability when the molten material 20 is melted is increased, and the solidified portion 21 can be formed in a wide range. Moreover, since the sheet member 11 and the pump housing 12 are heated by passing an electric current, the melt material 20 arranged in a ring shape can be simultaneously heated and melted over the entire circumference thereof, The melted molten material 20 flows down in a well-balanced manner around the entire circumference in the inflow space 24.

  Further, since a gap is formed between the front end portion of the pump housing 12 and the bottom portion of the seat member 11, the current flowing between the seat member 11 and the pump housing 12 is caused by the molten material 20 (accommodating groove 25). It flows in the vicinity, the heat generation effect in the vicinity of the molten material 20 is high, and the molten material 20 is efficiently melted.

  As described above, according to the plunger pump 10 and the manufacturing method thereof according to the present embodiment, high fixing strength between the seat member 11 and the pump housing 12 can be obtained while reducing the labor and time of manufacturing.

(Second embodiment)
Next, a second best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  The plunger pump according to this embodiment differs from the first embodiment in the fixing method of the seat member 11 and the pump housing 12. Since other configurations including the seat member 11 and the pump housing 12 are the same as those in the first embodiment, the description thereof is omitted.

  As shown in FIGS. 5 and 6, in this embodiment, when the pump housing 12 is fixed to the sheet member 11, first, the molten material is formed over the entire circumference of the accommodation groove 25 on the inner peripheral surface of the sheet member 11. After housing 20, the pump housing 12 is press-fitted into the seat member 11. At this time, the pump housing 12 is inserted to the back of the sheet member 11, and the front end portion of the pump housing 12 is brought into contact with the bottom portion of the sheet member 11.

  Then, the sheet member 11 is fixed between the fixing jigs 35 and 36 so that the sheet member 11 is on the upper side and the pump housing 12 is on the lower side. Thereafter, using a known laser irradiation device 37, the sheet member 11 is heated by irradiating the outer peripheral surface of the sheet member 11 on the outer side of the portion where the accommodation groove 25 is located. At this time, the focal point of the laser is blurred to heat the sheet member 11 in a wide range, not locally. The heating temperature by the laser irradiation device is a temperature at which the sheet member 11 and the pump housing 12 are not melted, and is set to a temperature at which only the molten material 20 located in the receiving groove 25 inside thereof is melted.

  As a result, the molten material 20 is melted in the housing groove 25 and flows into the inflow space 24 located below the housing groove 25 as shown in FIG. At this time, the sheet member 11 and the pump housing 12 in the vicinity of the accommodation groove 25 are heated in a wide range, and the sheet member 11 and the pump housing 12 around the inflow space 24 (in FIG. 6A, dot-shaped hatching). Since the temperature of the inflow space 24 is high, the wettability of the inflow space 24 is high, and the molten material 20 melted over the entire length of the inflow space 24 (length in the axial direction) can easily flow. Moreover, since the melted molten material 20 enters the groove portion 32 by knurling applied to the outer peripheral surface of the pump housing 12, the fixing strength is increased. In the laser irradiation, the irradiation time is set so that the melted molten material 20 flows into the entire inflow space 24 and solidifies, and the irradiation is automatically stopped.

  Thereafter, when a predetermined time elapses, the molten material 20 is completely solidified between the inner peripheral surface of the enlarged diameter portion 23 of the sheet member 11 and the outer peripheral surface of the pump housing 12 to become the solidified portion 21, Fixing with the pump housing 12 is completed.

  Also according to the present embodiment in which such a fixing process is performed, substantially the same operational effects as those of the first embodiment can be obtained.

(Third embodiment)
Next, a third best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  The plunger pump according to the present embodiment is different from the first embodiment in the fixing method of the seat member 11 ′ and the pump housing 12 and a part of the configuration of the seat member 11 ′. Since other configurations are the same as those in the first embodiment, the description thereof is omitted.

  As shown in FIGS. 7 and 8, the sheet member 11 ′ of the present embodiment has no accommodation groove formed on the inner peripheral surface thereof. The boundary portion between the press-fit portion 22 and the enlarged diameter portion 23 is formed in a tapered shape that gradually increases in diameter from the press-fit portion 22 toward the enlarged diameter portion 23. Moreover, the opening side end part 23a of the internal peripheral surface of the enlarged diameter part 23 is formed in the taper shape gradually diameter-expanded toward an outer side. Other configurations are the same as those in the first and second embodiments.

  When the pump housing 12 is fixed to the seat member 11 ', the pump housing 12 is first press-fitted into the seat member 11'. At this time, the pump housing 12 is inserted all the way into contact with the tip of the pump housing 12 and the bottom of the sheet member 11 ′.

  Then, the sheet member 11 ′ is placed on the lower side and the pump housing 12 is placed on the upper side. Thereafter, the molten material 20 is laid on the outer peripheral surface of the pump housing 12 over the entire periphery between the upper end of the seat member 11 ′ and the tapered opening-side end 23 a.

  Then, using the known laser irradiation device 37, the molten material 20, the surrounding sheet member 11 ′, and the pump housing 12 are irradiated with laser to heat the molten material 20 and the surrounding area. At this time, the focal point of the laser is blurred, and the heating is performed not only on the molten material 20 but also in a wide range around it. The heating temperature by the laser irradiation apparatus is set to a temperature at which the sheet member 11 ′ and the pump housing 12 are not melted, and only the molten material 20 located in the receiving groove 25 inside thereof is melted.

  As a result, the molten material 20 is melted between the sheet member 11 ′ and the pump housing 12, and is positioned below the opening end 23a of the sheet member 11 ′ as shown in FIG. 8B. It flows into the inflow space 24. At this time, the sheet member 11 ′ around the molten material 20 and the pump housing 12 are also heated in a wide range, and the sheet member 11 ′ around the inflow space 24 and the pump housing 12 (dots in FIG. 8A). Since the temperature of the range indicated by hatching is rising, the wettability of the inflow space 24 is high, and the molten material 20 that has melted over the entire circumference of the inflow space 24 flows easily. Further, since the opening side end portion 23a of the sheet member 11 'is formed in a tapered shape, the melted molten material 20 is guided to the inflow space 24 and smoothly flows. The melted molten material 20 is guided into the inflow space 24 and smoothly flows, and then enters the groove portion 32 by knurling applied to the outer peripheral surface of the pump housing 12.

  Thereafter, when a predetermined time has elapsed, the molten material 20 is completely solidified between the inner peripheral surface of the enlarged diameter portion 23 of the sheet member 11 ′ and the outer peripheral surface of the pump housing 12 to become the solidified portion 21, and the sheet member 11. 'And the pump housing 12 are fixed.

  Also according to this embodiment in which such a fixing process is performed, the same effects as those of the second embodiment can be obtained.

(Fourth embodiment)
Next, a fourth best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  The plunger pump according to the present embodiment is different from the first embodiment in the fixing method of the seat member 11 ″ and the pump housing 12 ″, and a part of the configuration of the seat member 11 ″ and the pump housing 12 ″. Since other configurations are the same as those in the first embodiment, the description thereof is omitted.

  As shown in FIGS. 9 and 10, the sheet member 11 ″ of the present embodiment has a molten material inflow groove 26 formed on the inner peripheral surface thereof. The molten material inflow groove 26 is an accommodation groove of the first embodiment. And is formed on the bottom side of the enlarged diameter portion 23 of the inner peripheral surface of the sheet member 11. The molten material inflow groove 26 flows into the molten material 20 and flows into the molten material inflow groove 26. It functions as a space that solidifies inside.

  On the other hand, the melt housing inflow groove 27 is formed on the outer peripheral surface of the pump housing 12 ″. The melt inflow groove 27 of the pump housing 12 ″ has the pump housing 12 ″ inserted into the seat member 11 ″. The sheet member 11 ″ is formed at a position facing the molten material inflow groove 26, and functions as a space in which the molten material 20 flows and solidifies therein.

  In the present embodiment, the pump housing 12 ″ is inserted to the back of the seat member 11 ″, and the front end portion of the pump housing 12 ″ is in contact with the bottom of the seat member 11 ″. It should be noted that the pump housing 12 ″ may be configured such that the front end of the pump housing 12 ″ is spaced from the bottom of the seat member 11 ″. In this case, the melt material inflow grooves 26 and 27 are configured to face each other. deep.

  The method for manufacturing a plunger pump according to the present embodiment is characterized in that when the pump housing 12 ″ is fixed to the seat member 11 ″, an electric current is directly applied to the molten material 20 and the molten material is melted by the resistance heat generation. To do.

  When fixing the pump housing 12 ″ to the seat member 11 ″, as shown in FIG. 9, first, the pump housing 12 ″ is press-fitted into the seat member 11 ″, and the upper end of the opening peripheral portion of the seat member 11 ″ is The molten material 20 is installed, and then the combined sheet member 11 ", pump housing 12" and molten material 20 are placed on the upper electrode 30 "with the sheet member 11" facing down and the pump housing 12 "facing up. And the lower electrode 31 ″. At this time, the molten material 20 is sandwiched and fixed between the sheet member 11 ″ and the upper electrode 30 ″.

  Thereafter, a current is passed between the upper electrode 30 ″ and the lower electrode 31 ″ for a predetermined time, and the melting material 20 is melted by the resistance heat generation (Joule heat). At this time, since the upper electrode 30 ″ is in contact with the molten material 20, the current flows through the molten material 20 to the sheet member 11 ″ as indicated by the arrow in FIG. . Thereby, since the molten material 20 is directly heated, it is easy to generate heat and can be efficiently melted. Therefore, the molten material 20 flows smoothly between the seat member 11 "and the pump housing 12".

  In addition, since the current flowing through the molten material 20 flows to the lower electrode 31 ″ through the sheet member 11 ″, the sheet member 11 ″ is also heated to ensure bendability. Further, the molten material 20 is melted. After that, since the current flows from the upper electrode 30 ″ to the lower electrode 31 ″ via the pump housing 12 ″ and the seat member 11 ″, the pump housing 12 ″ is also heated and the peripheral wall of the inflow space 24 and the molten material are heated. The bendability in the inflow grooves 26 and 27 is further increased. As a result, the molten material 20 is more likely to flow into the inflow space 24 and the molten material inflow grooves 26 and 27 between the sheet member 11 "and the pump housing 12".

  Thereafter, when a predetermined time elapses, the molten material 20 is completely solidified in the inflow space 24 and the molten material inflow grooves 26 and 27 to become the solidified portion 21, and the fixation between the seat member 11 "and the pump housing 12" is completed. . In particular, the solidified portion 21 that has flowed into the melted material inflow grooves 26 and 27 and solidified enters the member thickness direction from the inner peripheral surface of the sheet member 11 ″ and the outer peripheral surface of the pump housing 12 ″, thereby serving as a wedge. Has come to fulfill. This further increases the fixing strength between the seat member 11 "and the pump housing 12".

  In the present embodiment, the molten material inflow groove 26 is formed over the entire inner peripheral surface of the sheet member 11 ″, but may be formed intermittently. In this case, the pump housing The melt material inflow groove 27 on the outer peripheral surface of 12 ″ is formed at a position facing at least the melt material inflow groove 26.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of this invention, a design change is possible suitably. For example, in the first and second embodiments, the housing groove 25 is formed on the inner peripheral surface of the seat member 11, but is not limited thereto, and is formed on the outer peripheral surface of the pump housing 12. Also good. In this case, the housing groove is disposed so as to straddle the boundary position between the press-fit portion 22 and the enlarged diameter portion 23 of the sheet member 11 so that the molten material 20 contacts both the sheet member 11 and the pump housing 12.

  Moreover, in each said embodiment, although the knurling process is given to the outer peripheral surface of the pump housing 12, the groove part 32 is formed, but it is not limited to this, A groove part is formed by processes other than a knurling process. The surface may be roughened. Further, a groove portion may be formed on the surface of the enlarged diameter portion 23 of the sheet member 11.

It is sectional drawing which showed the attachment state to the base | substrate of the plunger pump which concerns on 1st embodiment. It is sectional drawing for demonstrating the adhering process of the sheet | seat member and pump housing in 1st embodiment. It is a figure for demonstrating the adhering process of the sheet | seat member and pump housing in 1st embodiment, Comprising: (a) The principal part expanded sectional view which showed the state before melting of a molten material, (b) is a molten material. It is a principal part expanded sectional view which showed the state after melting. It is the side view which showed the pump housing. It is sectional drawing for demonstrating the adhering process of the sheet | seat member and pump housing in 2nd embodiment. It is a figure for demonstrating the adhering process of the sheet | seat member and pump housing in 2nd embodiment, Comprising: (a) The principal part expanded sectional view which showed the state before melting of a molten material, (b) is a molten material. It is a principal part expanded sectional view which showed the state after melting. It is sectional drawing for demonstrating the adhering process of the sheet | seat member and pump housing in 3rd embodiment. It is a figure for demonstrating the adhering process of the sheet | seat member and pump housing in 3rd embodiment, Comprising: (a) The principal part expanded sectional view which showed the state before melting of a molten material, (b) is a molten material. It is a principal part expanded sectional view which showed the state after melting. It is sectional drawing for demonstrating the adhering process of the sheet | seat member and pump housing in 4th embodiment. It is a figure for demonstrating the adhering process of the sheet | seat member and pump housing in 4th embodiment, Comprising: (a) The principal part expanded sectional view which showed the state before melting of a molten material, (b) is a molten material. It is a principal part expanded sectional view which showed the state after melting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Plunger pump 11 Sheet member 12 Pump housing 20 Molten material 21 Solidification part 24 Inflow space 25 Housing groove 11 'Sheet member 11 "Sheet member 12" Pump housing 30 "Upper electrode 31" Lower electrode P Pump chamber

Claims (7)

In a plunger pump comprising a bottomed cylindrical sheet member and a cylindrical pump housing inserted into the sheet member, wherein a pump chamber is formed in the pump housing,
A molten material containing groove is formed on at least one of the inner peripheral surface of the seat member and the outer peripheral surface of the pump housing,
A gap is formed between the front end of the pump housing and the bottom of the seat member,
The plunger pump characterized in that the seat member and the pump housing are fixed to each other via a solidified portion obtained by causing a current to flow between the two members and melting the molten material by resistance heating to solidify the molten material. . In a plunger pump comprising a bottomed cylindrical sheet member and a cylindrical pump housing inserted into the sheet member, wherein a pump chamber is formed in the pump housing,
The pump housing has a part of its outer peripheral surface press-fitted into the seat member,
Between the inner peripheral surface of the seat member and the outer peripheral surface of the pump housing, a cylindrical inflow space into which the molten material flows is formed,
Molten material inflow grooves are formed opposite to each other on both the inner peripheral surface of the seat member and the outer peripheral surface of the pump housing,
In the inflow space and in the melt material inflow groove, a solidified portion is formed by solidifying after melting the melt material,
The plunger pump, wherein the seat member and the pump housing are fixed to each other via the solidified portion. The pump housing has a part of its outer peripheral surface press-fitted into the seat member,
Between the inner peripheral surface of the seat member and the outer peripheral surface of the pump housing, a cylindrical inflow space into which the molten material flows is formed,
The plunger pump according to claim 1 , wherein the solidified portion is formed in the inflow space. The knurl process is given to the part corresponded to the said inflow space of the outer peripheral surface of the said pump housing. The plunger pump of Claim 2 or Claim 3 characterized by the above-mentioned . In a manufacturing method of a plunger pump comprising a bottomed cylindrical sheet member and a cylindrical pump housing inserted into the sheet member, and a pump chamber is formed in the pump housing.
A molten material is accommodated in at least one of the inner peripheral surface of the sheet member and the outer peripheral surface of the pump housing,
After inserting the pump housing into the seat member such that a gap is formed between the front end portion and the bottom portion of the seat member,
Between the sheet member and the pump housing, an electric current is caused to flow in the vicinity of the molten material, and the molten material is heated and melted by the resistance heat generation,
A method for manufacturing a plunger pump, comprising: solidifying the melted molten material between the seat member and the pump housing to form a solidified portion; and fixing the seat member and the pump housing to each other. In a manufacturing method of a plunger pump comprising a bottomed cylindrical sheet member and a cylindrical pump housing inserted into the sheet member, and a pump chamber is formed in the pump housing.
After installing the sheet member on the lower electrode and inserting the pump housing from the upper side of the sheet member,
The molten material is installed at the upper end of the sheet member and the upper electrode is brought into contact with the upper part of the molten material to fix the molten material,
Directly passing an electric current through the molten material, melting the molten material by resistance heating,
A method for manufacturing a plunger pump, comprising: solidifying the melted molten material between the seat member and the pump housing to form a solidified portion; and fixing the seat member and the pump housing to each other. The molten material is solidified after flowing into the molten material inflow groove formed on the inner peripheral surface of the sheet member and the molten material inflow groove formed on the outer peripheral surface of the pump housing.
The manufacturing method of the plunger pump of Claim 6 characterized by the above-mentioned.

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